CN219841043U - Electronic expansion valve, thermal management system with electronic expansion valve and vehicle - Google Patents

Abstract

The utility model discloses an electronic expansion valve, a thermal management system and a vehicle with the electronic expansion valve, wherein the electronic expansion valve comprises: a valve housing assembly having a receiving cavity and a valve port; the valve needle assembly is arranged in the accommodating cavity in a reciprocating manner; the stator assembly and the rotor assembly are matched to enable the rotor assembly to rotate, and the rotor assembly is matched with the valve needle assembly to drive the valve needle assembly to reciprocate; the stator assembly has a first centerline, the mover assembly has a second centerline, the valve housing assembly has a first datum, the distance between the first centerline and the first datum is A, the distance between the second centerline and the first datum is B, and the mover assembly is configured to: -4.3mm < A-B <0.6mm. Therefore, the valve needle assembly can be selectively opened and closed through cooperation linkage of the rotor assembly and the valve needle assembly, the maximum valve opening capacity of the electronic expansion valve is ensured through the rotor assembly which is constructed to meet the requirements of-4.3 mm < A-B <0.6mm, and the valve opening capacity of the electronic expansion valve is improved.

Description

Electronic expansion valve, thermal management system with electronic expansion valve and vehicle

Technical Field

The utility model relates to the technical field of electronic expansion valves, in particular to an electronic expansion valve, a thermal management system with the electronic expansion valve and a vehicle.

Background

Electronic expansion valves are commonly used in air conditioning systems or thermal management systems for automobiles to regulate the opening of the electronic expansion valve by controlling the voltage or current applied to the electronic expansion valve, thereby regulating the flow of liquid in the circuit.

The electronic expansion valve in the related art cannot ensure that the driving force of the stator to the rotor is maximum when the valve is opened, so that the valve opening capability of the electronic expansion valve is poor.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides the electronic expansion valve, which has good valve opening effect.

An electronic expansion valve according to the present utility model includes: the valve housing assembly is provided with a containing cavity and a valve port, and the valve port is communicated with the containing cavity; the valve needle assembly can be arranged in the accommodating cavity in a reciprocating manner so as to open or close the valve port; the stator assembly is arranged in the valve housing assembly, the rotor assembly is arranged in the accommodating cavity, the stator assembly and the rotor assembly are matched to enable the rotor assembly to be rotatable, and the rotor assembly is matched with the valve needle assembly to drive the valve needle assembly to reciprocate; the stator assembly has a first center line, the mover assembly has a second center line, the first center line and the second center line are respectively perpendicular to the rotation axis of the mover assembly, the valve housing assembly has a first reference surface perpendicular to the rotation axis of the mover assembly, the first reference surface is positioned at one side of the stator assembly facing the valve port, the distance between the first center line and the first reference surface is A, the distance between the second center line and the first reference surface is B, and the mover assembly is configured to satisfy the following relation: -4.3mm < A-B <0.6mm.

According to the electronic expansion valve, the rotor component and the valve needle component are in matched linkage, so that the valve needle component can do reciprocating motion, the valve port is selectively opened and closed, the rotor component is constructed to meet the condition that-4.3 mm < A-B <0.6mm, the maximum valve opening capacity of the electronic expansion valve when the electronic expansion valve is switched from the valve port fully closed state to the valve port fully open state is ensured, the valve needle component can overcome the friction force between the valve needle component and the valve port to move in the direction deviating from the valve port along the axial direction, the valve opening capacity of the electronic expansion valve is ensured, and the control precision of the electronic expansion valve is improved.

According to some embodiments of the utility model, in the valve port fully closed state, the electronic expansion valve satisfies the following relationship: -0.6mm < A-B <0.6mm.

According to some embodiments of the utility model, the valve housing assembly comprises: the valve seat is provided with an assembling cavity and a plurality of fluid channels, the fluid channels are respectively communicated with the assembling cavity, and the first datum plane is positioned on the valve seat; the valve body is arranged in the assembly cavity, the valve body is provided with the valve port and a communication flow passage communicated with the valve port, and the valve port and the communication flow passage are respectively communicated with different fluid passages; a valve housing cooperating with at least one of the valve seat and the valve body to define a receiving cavity.

According to some embodiments of the utility model, the valve housing is an interference fit with the valve body.

According to some embodiments of the utility model, the height of the mating portion between the valve housing and the valve body is 0.8mm to 1.5mm in a direction parallel to the rotation axis of the mover assembly.

According to some embodiments of the utility model, the clearance between the mover assembly and the inner wall of the valve housing has a value of 0.35mm to 0.4mm.

According to some embodiments of the utility model, the valve body is provided with a guide channel for guiding the direction of movement of the valve needle assembly, the valve needle assembly being provided with a mating portion, at least part of which extends into the guide channel.

According to some embodiments of the present utility model, the outer diameter of the mating portion is D1, the length of the portion of the mating portion extending into the guide channel is L1, the ratio of the length L1 to the outer diameter D1 is an aspect ratio, and during the movement of the valve needle assembly, the ratio of the aspect ratios falls within the following ranges: 0.4 to 1.6.

According to some embodiments of the utility model, the electronic expansion valve further comprises a switching assembly fixed into the accommodation chamber, the switching assembly cooperating with the valve needle assembly to enable synchronous movement when the valve needle assembly rotates, and the mover assembly cooperating with the valve needle assembly to drive the valve needle assembly to rotate.

According to some embodiments of the utility model, the valve needle assembly includes a valve stem, an elastic member disposed between a first end of the valve stem and the valve needle, the valve stem moving to move the valve needle to open or close the valve port, and the valve stem being secured to the mover assembly and cooperating with the switching assembly.

According to some embodiments of the utility model, the valve needle assembly further comprises a mounting seat, the valve rod is matched with the mounting seat, the elastic piece is arranged in the mounting seat, one end of the elastic piece is abutted against the valve rod, the other end of the elastic piece is abutted against the mounting seat, and the valve needle is arranged on the mounting seat.

According to some embodiments of the utility model, a first gap is arranged between the mounting seat and the inner wall of the valve body, the mounting seat is provided with a balance hole, and the balance hole is communicated with the inner space of the mounting seat and the first gap.

It is another object of the present utility model to propose a thermal management system.

The thermal management system according to the utility model comprises the electronic expansion valve.

Because the thermal management system is provided with the electronic expansion valve, through cooperation linkage of the rotor component and the valve needle component, the valve needle component can reciprocate, so that the valve port is selectively opened and closed, through the rotor component which is structured to meet the condition that-4.3 mm < A-B <0.6mm, the maximum valve opening capacity of the electronic expansion valve when the electronic expansion valve is switched from the valve port full closing state to the valve port full opening state is ensured, the valve needle component can overcome the friction force between the valve needle component and the valve port to move in the direction deviating from the valve port along the axial direction, the valve opening capacity of the electronic expansion valve is improved, and the control precision of the electronic expansion valve is improved.

It is a further object of the utility model to propose a vehicle.

The vehicle according to the utility model comprises the thermal management system described above.

Because the thermal management system is provided with the electronic expansion valve, through cooperation linkage of the rotor component and the valve needle component, the valve needle component can reciprocate, so that the valve port is selectively opened and closed, through the rotor component which is structured to meet the condition that-4.3 mm < A-B <0.6mm, the maximum valve opening capacity of the electronic expansion valve when the electronic expansion valve is switched from the valve port full closing state to the valve port full opening state is ensured, the valve needle component can overcome the friction force between the valve needle component and the valve port to move in the direction deviating from the valve port along the axial direction, the valve opening capacity of the electronic expansion valve is improved, and the control precision of the electronic expansion valve is improved.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic diagram of an electronic expansion valve according to some embodiments of the present utility model when a valve port is fully closed;

FIG. 2 is an enlarged view at J in FIG. 1;

FIG. 3 is a schematic view of an electronic expansion valve according to some embodiments of the present utility model when a valve port is fully opened;

FIG. 4 is a schematic view of a valve needle assembly according to an embodiment of the present utility model;

FIG. 5 is a schematic diagram of a conversion assembly according to an embodiment of the present utility model;

FIG. 6 is a schematic view of a part of an electronic expansion valve according to another embodiment of the present utility model;

FIG. 7 is an enlarged view of K in FIG. 6;

FIG. 8 is an enlarged view of M in FIG. 6;

FIG. 9 is a schematic diagram showing a part of an electronic expansion valve according to another embodiment of the present utility model;

fig. 10 is an enlarged view of N in fig. 9;

FIG. 11 is a schematic view of a part of an electronic expansion valve according to another embodiment of the present utility model;

FIG. 12 is an enlarged view of FIG. 11 at O;

FIG. 13 is a schematic view of a conversion assembly according to other embodiments of the present utility model;

fig. 14 is an enlarged view of fig. 13 at Q.

Reference numerals:

electronic expansion valve 100, valve port 11, first portion 111, second portion 112, accommodation chamber 12, valve seat 13, fluid passage 131, valve body 14, communication passage 141, guide passage 142, first gap 143, second gap 144, valve housing 15, and valve casing,

Valve needle assembly 20, valve stem 21, limit fitting portion 211, elastic member 22, valve needle 23, body portion 231, transition section 232, guide portion 233, fitting portion 234, engagement boss 2341, mounting seat 24, nut positioning piece 241, bushing 25, bearing 26,

Stator assembly 30, stator frame 31,

A mover body 41, a guide 42, a connection plate 43,

Conversion unit 50, conversion member 51, rotation member 52, stopper 521, mating spring 53,

The first stopper 61, the second stopper 62, the fixing step 63, the first end face 631.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the terms "center," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the utility model. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

An electronic expansion valve 100 according to an embodiment of the present utility model is described in detail below with reference to fig. 1-14.

Referring to fig. 1 and 3 in combination, an electronic expansion valve 100 according to the present utility model includes: valve casing subassembly, needle subassembly 20, stator subassembly 30 and mover subassembly, wherein, the valve casing subassembly is equipped with holds chamber 12 and valve port 11, and valve port 11 and hold chamber 12 intercommunication, and needle subassembly 20 can locate in holding chamber 12 in order to open or close valve port 11 with reciprocating motion, and stator subassembly 30 locates the valve casing subassembly, and the mover subassembly is located and is held in chamber 12, and stator subassembly 30 and mover subassembly cooperation are so that the mover subassembly is rotatable, and the mover subassembly cooperates with needle subassembly 20 in order to drive needle subassembly reciprocating motion.

Specifically, the stator assembly 30 is mounted on the valve housing assembly, the stator assembly 30 is opposite to the rotor assembly, and after the stator assembly 30 is powered on, a variable magnetic field is generated to drive the rotor assembly to rotate, the rotor assembly can be in transmission connection with the valve needle assembly 20 to drive the valve needle assembly 20 to reciprocate in the accommodating cavity 12, and the valve needle assembly 20 can be used for blocking the valve port 11 so as to selectively open and close the valve port 11 through the reciprocating movement of the valve needle assembly 20.

When the valve needle assembly 20 is driven by the rotor assembly to move in the direction approaching to the valve port 11, the valve needle assembly 20 is in plug fit with the valve port 11 to plug the valve port 11, so that the electronic expansion valve 100 is in a closed state, and when the valve needle assembly 20 is driven by the rotor assembly to move in the direction deviating from the valve port 11, the valve needle assembly 20 moves in the direction deviating from the valve port 11 to switch the valve port 11 from the closed state to the open state as shown in fig. 3.

Further, the stator assembly 30 has a first center line, the mover assembly has a second center line, the first center line and the second center line are respectively perpendicular to the rotation axis of the mover assembly, the valve housing assembly has a first reference plane perpendicular to the rotation axis of the mover assembly, the first reference plane is located at one side of the stator assembly 30 facing the valve port 11, a distance between the first center line and the first reference plane is a, a distance between the second center line and the first reference plane is B, and the mover assembly is configured to satisfy the following relation: -4.3mm < A-B <0.6mm.

It should be noted that, in the moving process of the valve needle assembly 20, the mover assembly not only rotates relative to the first end surface of the valve housing assembly but also reciprocates relative to the valve housing assembly, so that the position of the second center line of the mover assembly changes relative to the first reference surface, and in the moving process of the mover assembly, it is necessary to ensure that the distance B between the second center line and the first reference surface always satisfies the relationship: -4.3mm < A-B <0.6mm.

Specifically, when the valve port 11 is fully closed to a state in which the valve port 11 is opened, the frictional force between the needle assembly 20 and the valve port 11 is maximized, and the mover assembly is structured such that the distance B between the second center line and the first reference surface always satisfies the relationship: -4.3mm < A-B <0.6mm

The middle part of the rotor assembly in the radial direction and the middle part of the stator assembly 30 in the radial direction are arranged oppositely, and the driving force of the stator assembly 30 to the rotor assembly is better than that of other positions when the valve port 11 is switched to the state of full opening, so that the driving effect of the rotor assembly to the valve port 20 is ensured, namely, the valve opening capability of the electronic expansion valve 100 when the valve port 11 is switched to the state of full opening from the full opening of the valve port 11 is ensured, and the valve port 20 can overcome the friction force between the valve port 11 and the valve port 20 to move along the axial direction in a direction deviating from the valve port 11, so as to open the valve port 11. Meanwhile, the situation that the stator assembly 30 cannot be effectively coupled with the rotor assembly and cannot drive the rotor assembly to move because the rotor assembly is too far away from the stator assembly 30 can be avoided.

According to the electronic expansion valve 100 of the present utility model, the valve needle assembly 20 can reciprocate by cooperatively linking the mover assembly with the valve needle assembly 20, so that the valve port 11 is selectively opened and closed, and the distance B between the second center line and the first reference plane by configuring the mover assembly always satisfies the relationship: -4.3mm < A-B <0.6mm, and the maximum valve opening capability of the electronic expansion valve 100 is ensured when the electronic expansion valve is switched from the valve port 11 fully closed state to the valve port 11 fully open state, so that the valve needle assembly 20 can overcome the friction force between the valve needle assembly 20 and the valve port 11 to move in the axial direction in the direction away from the valve port 11, the valve opening capability of the electronic expansion valve 100 is improved, and the control precision of the electronic expansion valve 100 is improved.

In some embodiments of the present utility model, when the valve port 11 is in the fully closed state, the electronic expansion valve 100 satisfies the following relationship: -0.6mm < A-B <0.6mm.

Specifically, when the valve port 11 is in the fully closed state, the mover assembly is configured to satisfy-0.6 mm < a-B <0.6mm, preferably a-b=0, so that the stator assembly 30 has the best driving effect on the mover assembly when the valve port 11 is switched from the fully closed state to the fully open state, thereby ensuring that the mover assembly has the best driving effect on the valve needle assembly 20, that is, ensuring that the valve opening capability of the electronic expansion valve 100 is the largest when the valve port 11 is switched from the fully closed state to the fully open state of the valve port 11, so that the valve needle assembly 20 can move in a direction away from the valve port 11 in the axial direction against the friction force between the valve needle assembly 20 and the valve port 11, so as to ensure that the valve port 11 can be opened.

Further, when the valve port 11 is in the fully opened state, the mover assembly is configured to satisfy a-B < 4, preferably a-b=3, and when the valve port 11 is switched from the fully opened state to the fully closed state, the friction force to be overcome by the valve needle assembly 20 is small, and when a-b=3, the mover assembly can drive the valve needle assembly 20 to move along the axial direction.

In some embodiments of the utility model, with reference to fig. 1 and 3, a valve housing assembly includes: the valve seat 13 is provided with an assembly chamber and a plurality of fluid passages 131, and the plurality of fluid passages 131 are respectively communicated with the assembly chamber, a first reference surface is positioned on the valve seat 13, the assembly chamber is used for installing the valve body 14, a valve port 11 and a communication flow passage 141 communicated with the valve port 11 are formed on the valve body 14, the valve port 11 and the communication flow passage 141 are respectively communicated with different fluid passages 131, and the valve housing 15 is matched with at least one of the valve seat 13 and the valve body 14 to define the accommodating cavity 12.

Specifically, a plurality of fluid passages 131 are respectively provided at different positions of the valve seat 13, the valve body 14 is mounted on the valve seat 13, the plurality of fluid passages 131 are respectively connected to external elements (e.g., piping for flowing medium, heat exchanger, etc. in the thermal management system), and when the valve port 11 is opened and serves as an outlet, fluid can flow in from one of the fluid passages 131 and flow out from the other fluid passage 131 through the communication flow passage 141 and the valve port 11, thereby realizing the conduction function of the electronic expansion valve. When the valve port 11 is opened and serves as an inlet, fluid can flow from one of the fluid passages 131 into the valve port and the communication flow passage 141 and then flow out of the other fluid passage 131, thereby realizing the conduction function of the electronic expansion valve.

It will of course be appreciated that when the valve needle assembly 20 closes the valve port, a portion of the valve needle assembly 20 is inserted into the communication flow passage 141 to shut off the flow of fluid within the communication flow passage 141.

Further, the stator assembly 30 is sleeved on the valve housing 15, the stator assembly 30 can be fixedly connected with the valve seat 13 through the stator bracket 31, the rotor assembly is installed in the accommodating cavity 12 and is opposite to the rotor assembly, the first datum plane can be configured as the upper end face of the valve seat 13, the distance between the first central line and the upper end face of the valve seat 13 is A, the distance between the second central line and the valve seat 13 is B, the rotor assembly and the stator assembly 30 are oppositely arranged in the radial direction, and a changing magnetic field is generated after the stator assembly 30 is electrified to drive the rotor assembly to rotate, and the rotor assembly is connected with the valve needle assembly 20 so that the rotor assembly can be in linkage with the valve needle assembly 20.

In some embodiments of the utility model, the clearance between the mover assembly and the inner wall of the valve housing 15 has a value of 0.35mm to 0.4mm.

Specifically, the rotor body 41 and the valve housing 15 are arranged at intervals to prevent the valve housing 15 from interfering with the movement of the rotor assembly, a gap between the outer wall of the rotor body 41 and the inner wall of the valve housing 15 is set between 0.35mm and 0.4mm to prevent the overlarge interval between the stator assembly 30 and the rotor assembly, so that the driving effect of the stator assembly 30 on the rotor assembly is ensured, and meanwhile, the driving failure of the stator assembly 30 on the rotor assembly caused by shaking of the rotor assembly is prevented, and the normal operation of the electronic expansion valve 100 is ensured.

In some embodiments of the utility model, referring to fig. 11 and 12, valve housing 15 is an interference fit with valve body 14.

Specifically, the valve body 14 is matched with the valve housing 15 in the axial direction, and the valve housing 15 and the valve body 14 can be welded and connected to ensure the fixed connection effect of the valve body 14 and the valve housing 15, and the interference fit of the valve body 14 and the valve housing 15 can prevent the valve body 14 and the valve housing 15 from falling off or the valve body 14 and the valve housing 15 from being skewed after being welded.

Referring to fig. 11 and 12, the height of the fitting portion between the valve housing 15 and the valve body 14 is 0.8 to 1.5mm in parallel to the rotation axis of the mover assembly.

Specifically, the size h of the interference fit of the valve body 14 with the valve housing 15 is 0.8mm to 1.5mm, and within this range, the size of the interference fit of the valve body 14 with the valve housing 15 is preferably 1.2mm, preventing the valve housing 15 from being not fitted in place with the valve body 14 or the valve body 14 from being deformed due to the thin wall thickness of the valve housing 15, the large interference between the valve body 14 and the valve housing 15, or the long distance of the interference fit.

Referring to fig. 1, 4 and 5, in some embodiments of the present utility model, the electronic expansion valve 100 further includes a switching assembly 50, the switching assembly 50 being secured within the receiving chamber 12, the switching assembly 50 cooperating with the needle assembly 20 such that the needle assembly 20 can move synchronously as it rotates, the mover assembly cooperating with the needle assembly 20 to drive the needle assembly 20 to rotate.

Specifically, the conversion assembly 50 is disposed in the accommodating cavity 12, and the conversion assembly 50 may be fixedly connected with the valve body 14, the valve needle assembly 20 may be in transmission fit with the conversion assembly 50, one end of the valve needle assembly facing away from the valve port 11 is fixedly connected with the mover assembly, the mover assembly may drive the valve needle assembly 20 to rotate relative to the conversion assembly 50, and meanwhile, the transmission fit between the valve needle assembly 20 and the conversion assembly 50 may convert the rotation of the valve needle assembly 20 into movement along the axial direction thereof, so as to selectively open or close the valve port 11.

As shown in fig. 4, in some embodiments of the present utility model, the valve needle assembly includes a valve stem 21, an elastic member 22, and a valve needle 23, the elastic member 22 being disposed between a first end of the valve stem 21 and the valve needle 23, the valve stem 21 moving to move the valve needle 23 to open or close the valve port 11, the valve stem 21 being secured to the mover assembly and cooperating with the switching assembly 50.

Specifically, the mover assembly is fixedly connected with the valve rod 21, the stator assembly 30 generates a changing magnetic field to drive the mover assembly to rotate after being electrified, the mover assembly can be in transmission connection with the valve rod 21 to drive the valve rod 21 to reciprocate in the accommodating cavity 12, one end of the valve rod 21, which is close to the valve port 11, is defined as a first end of the valve rod 21, the first end of the valve rod 21 is connected with the valve needle 23, and the valve needle 23 can be used for blocking the valve port 11 so as to drive the valve needle 23 to selectively open and close the valve port 11 through the reciprocation of the valve rod 21.

When the valve rod 21 is driven by the rotor assembly to move in the direction approaching the valve port 11, the valve rod 21 can drive the valve needle 23 to move in the direction approaching the valve port 11, and as shown in fig. 1 and 2, the valve needle 23 is in plug-in fit with the valve port 11 so that the valve needle 23 plugs the valve port 11, and therefore the electronic expansion valve 100 is in a closed state, and as shown in fig. 3, when the valve rod 21 is driven by the rotor assembly to move in the direction deviating from the valve port 11, the valve rod 21 can drive the valve needle 23 to move in the direction deviating from the valve port 11, so that the valve port 11 is switched from the closed state to the open state.

Referring to fig. 1, 4 and 5, in some embodiments of the present utility model, the switching assembly 50 is threadedly engaged with the valve stem 21 such that the valve stem 21 is rotatable and movable relative to the switching assembly 50, and the mover assembly is fixed to the valve stem 21 to rotate the valve stem 21.

Specifically, the conversion assembly 50 is disposed in the accommodating cavity 12, and the conversion assembly 50 may be fixedly connected with the valve body 14, the valve rod 21 may be in threaded engagement with the conversion assembly 50, one end of the valve rod 21 facing away from the valve port 11 is fixedly connected with the mover assembly, the mover assembly may drive the valve rod 21 to rotate relative to the conversion assembly 50, and at the same time, the threaded engagement between the valve rod 21 and the conversion assembly 50 may convert rotation of the valve rod 21 into movement along an axial direction thereof, and the valve rod 21 drives the valve needle 23 to move along the axial direction of the valve rod 21 so as to selectively open or close the valve port 11.

In some embodiments of the present utility model, the switching assembly 50 cooperates with the mover assembly to define the number of turns of the mover assembly, thereby defining the distance that the valve stem 21 is movable by defining the number of turns that the mover assembly can turn, and defining the distance that the valve stem 21 is movable, thereby defining the distance that the valve needle 23 can move, and thus achieving precise control of the valve needle 23, thereby further improving the control accuracy and qualification rate of the electronic expansion valve.

Specifically, referring to fig. 1 and 3, the mover assembly is in driving connection with the switching assembly 50, and the mover assembly may rotate relative to the switching assembly 50, while the mover assembly may move relative to the switching assembly 50 in an axial direction of the switching assembly 50, and the switching assembly 50 may be in limiting engagement with the mover assembly to limit the number of rotations of the mover assembly by limiting the distance the mover assembly moves relative to the switching assembly 50.

As shown in fig. 5, in some embodiments of the present utility model, the conversion assembly 50 includes a conversion member 51 and a rotation member 52, the conversion member 51 is in threaded engagement with the valve stem 21, a limit assembly is provided at an outer circumference of the conversion member 51, the rotation member 52 is rotatably and movably provided at an outer circumference of the conversion member 51, the rotation member 52 is engaged with the limit assembly to limit a movement displacement of the rotation member 52, and the mover assembly is engaged with the rotation member 52 to push the rotation member 52 to rotate.

Specifically, referring to fig. 1, 5 and 6, the rotating member 52 may rotate relative to the converting member 51, and the mover assembly may be in a limited fit with the rotating member 52 to push the rotating member 52 to rotate relative to the converting member 51, and the rotating member 52 moves in an axial direction thereof while rotating relative to the converting member 51, thereby implementing linkage of the mover assembly and the rotating member 52.

With further reference to fig. 6, the limiting component can limit the movement displacement of the rotating member 52 relative to the conversion member 51, that is, the limiting component can limit the rotation number of the rotating member 52 and the movement distance of the rotating member 52 relative to the conversion member 51 in the axial direction, and because the rotor component is in transmission fit with the rotating member 52, the rotor component can be limited to continue to rotate when the rotating member 52 is in limit fit with the limiting component, so that the rotation number of the rotor component is limited. Thereby making the structure of the conversion assembly 50 simple.

In some embodiments of the present utility model, as shown in fig. 5, the outer peripheral wall of the conversion member 51 is integrally formed with a spiral groove, and the rotation member 52 is sleeved on the conversion member 51 and is screw-engaged with the spiral groove.

Specifically, the spiral groove and the conversion member 51 are integrally formed so as to facilitate the assembly of the electronic expansion valve 100, and meanwhile, the structure of the electronic expansion valve 100 can be simplified, the conversion member 51 is provided with the spiral groove, the rotation member 52 can be arranged in the spiral groove, the rotation member 52 can rotate in the spiral groove, the rotation member 52 moves along the axial direction of the rotation member 52 while rotating relative to the conversion member 51, the movable distance of the rotation member 52 is limited by arranging the limiting assembly and limiting the length of the spiral groove, and the rotation member 52 is in cooperation linkage with the rotor assembly, so that the number of rotatable turns of the rotor assembly is limited.

The conversion element 51 may be configured as a nut provided with an internal thread and a spiral groove, and the nut may be fixed on the valve body 14 through the nut positioning piece 241, so as to fix the conversion assembly 50 on the valve body 14, and referring to fig. 1, 3 and 5, the valve rod 21 may be configured as a screw provided with an external thread structure, and the screw may be threaded through the nut and be in threaded engagement with the internal thread, and the rotation element 52 may move with respect to the conversion element 51 through the spiral groove, which of course is understood that the structure of the conversion element 51 and the valve rod 21 is only one embodiment of the present utility model, and is not to be construed as limiting the present utility model.

As shown in fig. 5, in some embodiments of the present utility model, the limiting assembly is a first limiting member 61 and a second limiting member 62 disposed at intervals along the moving direction of the valve rod 21, and the rotating member 52 is stopped against one of the first limiting member 61 and the second limiting member 62 to limit the moving displacement of the rotating member 52. It should be noted that, by controlling the number of the closing steps performed by the rotor assembly, the rotating member 52 may be located at any position between the first limiting member 61 and the second limiting member 62, so as to control the cooperation between the valve needle 23 and the valve port 11, and adjust the opening of the valve port 11, thereby achieving the purpose of adjusting the flow.

Specifically, the first limiting member 61 and the second limiting member 62 are disposed at intervals in the axial direction of the switching member 51, and the first limiting member 61 is disposed at one end of the spiral groove facing away from the valve port 11, and the second limiting member 62 is disposed at one end of the spiral groove facing toward the valve port 11, as shown in fig. 5, when the rotating member 52 rotates to the end of the spiral groove facing away from the valve port 11, the first limiting member 61 is in abutting engagement with the rotating member 52 to limit the rotating member 52 to continue rotation, and when the rotating member 52 rotates to the end of the spiral groove facing toward the valve port 11, the second limiting member 62 is in abutting engagement with the rotating member 52 to limit the rotating member 52 to continue rotation, and the mover assembly is in driving engagement with the rotating member 52 to limit the number of rotations of the mover assembly by limiting the number of rotations of the mover assembly, and the mover assembly is connected with the valve rod 21, so that the movable distance of the valve rod 21 is limited by limiting the number of rotations of the mover assembly, and the movable distance of the valve rod 21 is limited by limiting the movable distance of the valve rod 21, so that the movable distance of the valve needle 23 is limited by limiting the movable distance of the valve rod 21, so that precise control of the valve needle 23 is realized.

Wherein, the first limiting member 61 and the second limiting member 62 may be configured as limiting protrusions extending along a radial direction of the switching member 51, and the limiting protrusions may be in a stop fit with the rotating member 52 in a direction perpendicular to an axis of the switching member 51 to limit the rotation of the rotating member 52, thereby limiting the number of rotations of the mover assembly.

As shown in fig. 13, in other embodiments of the present utility model, a mating spring 53 may be fixed to an outer peripheral wall of the conversion member 51, two ends of the mating spring 53 are respectively fixed to the conversion member 51, a spiral groove is defined by the mating spring 53 and the outer peripheral wall of the conversion member 51, and the rotation member 52 is mated with the spiral groove to move relative to the conversion member 51 during rotation.

With further reference to fig. 14, the switching member 51 is further provided with a fixing step 63, the fixing step 63 is provided at one end of the switching member 51 near the valve port 11, and one end of the mating spring 53 is fixed to the fixing step 63. Further, one end of the mating spring 53 may be hooked on the first end surface 631 of the fixing step 63 facing the valve port.

In a further example of the utility model, referring to fig. 13 and 14, the first end surface 631 may form a slope extending toward the valve port and toward the interior space away from the transition piece 51, and the angle β between the first end surface 631 and the horizontal surface may be set to 5 ° to provide a drop-preventing effect on one end of the mating spring 53.

Referring to fig. 1 and 3, in some embodiments of the present utility model, the mover assembly includes a mover body 41 and a guide member 42, the mover body 41 is sleeved on the switching assembly 50, the guide member 42 is fixed to the mover body 41, and a portion of the guide member 42 extends in a moving direction of the valve rod 21, and the guide member 42 is stopped against the rotation member 52.

Specifically, referring to fig. 1 and 6, at least a portion of the conversion assembly 50 is disposed in the mover body 41, the guide member 42 is disposed in the mover body 41, and one end of the mover body 41 facing away from the valve port 11 is provided with a connecting plate 43, the connecting plate 43 is fixedly connected with an inner wall surface of the mover body 41, the guide member 42 is fixedly connected with the connecting plate 43, so that the guide member 42 is fixedly connected with the mover body 41, the mover body 41 can drive the guide member 42 to rotate synchronously, and meanwhile, a portion of the guide member 42 extends along an axial direction of the conversion member 51 so as to be in abutting fit with the rotation member 52, the rotor body 41 can drive the rotation member 52 to move on the conversion member 51 through the guide member 42 by virtue of the guide member 42, and in addition, the conversion member 51 can avoid the guide member 42, so that the conversion member 51 interferes with the movement of the guide member 42, and the movement effect of the mover assembly is affected. It will be understood that the fixing manner of the guide member 42 and the mover body 41 is not limited thereto, as long as the fixing can be realized, so that the mover body 41 and the stator assembly can be coupled for rotation and the guide member 42 can be driven for rotation.

Further, the limiting assembly is in limiting engagement with the rotating member 52 to limit the movement of the rotating member 52 relative to the switching member 51, and the rotating member 52 is in abutting engagement with the guiding member 42 to limit the movement of the guiding member 42, so that the number of rotations of the mover assembly is limited by the limiting assembly.

In a further embodiment of the utility model, referring to fig. 1, 5 and 6, the rotary member 52 may be provided with a stop ring having a stop portion 521 extending in a radial direction away from the switching member 51, the stop portion 521 being adapted to be in stop-fit with the guide member 42, the guide member 42 being adapted to drive the rotary member 52 to rotate by being in stop-fit with the stop portion 521, and a stop assembly being adapted to limit the number of rotations of the rotary member 52 by being in stop-fit with an end portion of the stop ring, the rotary assembly being in linkage with the mover assembly, thereby limiting the number of rotations of the mover assembly.

With further reference to fig. 6, the end surface of the stopping portion 521 facing away from the central axis of the conversion member 51 is spaced from the wall surface (outer side wall) of the guide member 42 facing away from the central axis of the conversion member 51, and the distance between the end surface of the stopping portion 521 facing away from the central axis of the conversion member 51 and the central axis of the conversion member 51 is greater than the distance between the outer side wall of the guide member 42 and the central axis of the conversion member 51, so as to ensure the effect of stopping engagement between the guide member 42 and the stopping portion 521, and prevent the engaging failure of the mover assembly and the rotation member 52 caused by the engaging failure between the guide member 42 and the stopping portion 521 in the process of driving the rotation member 52, and the distance E between the end surface of the stopping portion 521 facing away from the central axis of the conversion member 51 and the outer side wall of the guide member 42 is preferably 1.4mm in consideration of the angle and tolerance of actual processing.

Meanwhile, the end surface of the stopping portion 521 facing away from the center axis of the conversion member 51 and the inner wall surface of the mover body 41 are disposed at an interval to prevent the occurrence of friction therebetween to cause part failure or interfere with the movement process of the mover assembly and the rotator 52 to prevent the electronic expansion valve 100 from failing, preferably, the distance F between the end surface of the stopping portion 521 facing away from the center axis of the conversion member 51 and the inner wall surface of the mover body 41 is configured to be 0.5mm in consideration of actual processing angle and tolerance, and the angle 87.7 ° - α -94.3 °, preferably α -90 °, defined between the portion of the mover 42 extending in the axial direction and the connection plate 43 is configured to prevent friction between the mover body 41 and the part failure.

With further reference to fig. 6 and 11, in the axial direction, the distance G between the end of the guide member 42 close to the valve port 11 and the connection plate 43 is greater than the distance between the stop ring and the connection plate 43 when the stop ring is closest to the valve port 11 (the distance between the stop ring and the connection plate 43 when the valve port 11 is fully closed), so as to prevent the stop ring from disengaging from the guide member 42 when moving in the axial direction, ensure that the stop engagement of the stop ring and the guide member 42 is effective, and the distance G between the end of the guide member 42 close to the valve port 11 and the connection plate 43 is preferably 15.2mm in view of practical machining angle and tolerance.

Further, in connection with fig. 6 and 11, the guide member 42 is disposed at a distance from the spiral groove of the switching member 51 in the radial direction to prevent the guide member 42 from rubbing against the spiral groove during rotation to cause failure of the parts, and the distance H between the wall surface (inner side wall) of the guide member 42 near the center axis of the switching member 51 and the spiral groove is preferably 0.7mm in view of processing and assembly errors.

As shown in fig. 6, in some embodiments of the utility model, the guide 42 is fixed to the valve stem 21, and the free end of the valve stem 21 protrudes beyond the guide 42. So that the fixing reliability between the valve rod 21 and the guide 42 can be ensured.

Further, the connection plate 43 is fixedly connected with the inner wall surface of the rotor body 41, the valve rod 21 is fixedly connected with the connection plate 43, and meanwhile, the guide member 42 is fixedly connected with the connection plate 43, so that the guide member 42 is fixedly connected with the valve rod 21, the rotor assembly can drive the valve rod 21 to rotate relative to the conversion member 51, and due to the fact that the valve rod 21 is in threaded fit with the conversion member 51, the valve rod 21 can move along the axial direction of the conversion member 51 while rotating relative to the conversion member 51, and accordingly the valve needle 23 is driven to selectively open or close the valve port 11.

In a further embodiment of the utility model, as shown in fig. 6, the valve rod 21 may be welded to the connection plate 43, the free end of the valve rod 21 (the end of the valve rod 21 facing away from the valve needle 23 is defined as the free end of the valve rod 21) is disposed through the connection plate 43 to improve the stability of the valve rod 21, prevent the end of the valve rod 21 from swinging, improve the transmission effect of the valve rod 21, and the distance I between the top end of the free end of the valve rod 21 and the top end of the connection plate 43 is preferably 2.0mm to ensure the welding strength between the valve rod 21 and the connection plate 43.

The clearance fit between the valve rod 21 and the connection plate 43 is made before the welding, and in order to prevent deflection of the valve rod 21 and the connection plate 43 before the welding, the fit height between the valve rod 21 and the connection plate 43 is reasonably designed according to the outer diameter size of the valve rod 21 and the clearance size between the valve rod 21 and the connection plate 43, preferably, the clearance tolerance between the valve rod 21 and the connection plate 43 is (+0.005 to +0.04), and the ratio (i.e., the length-diameter ratio) of the fit height between the valve rod 21 and the connection plate 43 to the outer diameter of the valve rod 21 is preferably 1.75.

In the embodiment of the present utility model shown in fig. 1 and 3, the guide 42 is directly connected to the mover body 41, the guide 42 is constructed in an L shape, the guide 42 has a portion extending in the moving direction of the valve stem 21 and a portion extending perpendicular to the moving direction of the valve stem 21, and when the guide 42 is directly connected to the mover body 41, the free end of the valve stem 21 is penetrated through the portion of the guide 42 extending perpendicular to the moving direction of the valve stem 21.

Referring to fig. 1 and 4, in some embodiments of the present utility model, the valve needle assembly 20 further includes a mounting seat 24, the valve rod 21 is mated with the mounting seat 24, the elastic member 22 is disposed in the mounting seat 24, and one end of the elastic member 22 abuts against the valve rod 21 and the other end abuts against the mounting seat 24, and the valve needle 23 is disposed in the mounting seat 24.

Specifically, referring to fig. 4, the mounting seat 24 may be configured as a spring housing, the end portion of the spring housing facing away from the valve port 11 is fixedly provided with a bushing 25, the valve rod 21 may be inserted through the bushing 25 and extend into the spring housing, the bushing 25 may play a sealing role between the valve rod 21 and the spring housing, so as to improve the sealing effect between the valve rod 21 and the spring housing, and meanwhile, the bushing 25 may reduce friction between the spring housing and the valve rod 21, so as to improve the service life of the electronic expansion valve 100.

The valve rod 21 can slide along the axial direction in the spring housing, the end portion, close to the valve needle 23, of the valve rod 21 is provided with a limit fit portion 211 capable of being matched with the bushing 25, the limit fit portion 211 and the bushing 25 can be in stop fit in the axial direction so as to prevent the valve rod 21 from being separated from the spring housing, and meanwhile, the valve rod 21 can drive the spring housing to move along the axial direction through the limit fit portion 211, wherein the radial size of the limit fit portion 211 can be identical to the inner diameter size of the spring housing, so that the limit fit portion 211 can be in stop fit with the inner peripheral wall of the spring housing, the fit stability of the valve rod 21 and the spring housing is improved, and the valve rod 21 is prevented from shaking.

With further reference to fig. 1 and 4, a bearing 26 is fixed at the end position of the spring housing close to the valve port 11, the bearing 26 is arranged in the spring housing, the valve needle 23 is fixedly connected with the inner ring of the bearing 26, the elastic piece 22 can be configured as a spring, one end of the spring is in stop fit with the valve rod 21, the other end of the spring is in stop fit with the bearing 26, when the valve rod 21 is driven by the rotor assembly to move towards the direction close to the valve port 11, the valve rod 21 presses against the spring, the spring has a trend of driving the bearing 26 to move towards the valve port 11, the bearing 26 drives the spring housing to move towards the direction close to the valve port 11, so that the valve rod 21 drives the spring housing to move towards the valve port 11, and meanwhile, the valve needle 23 drives the valve needle 23 to move towards the valve port 11 through the bearing 26, so that the valve needle 23 seals the valve port 11, and the electronic expansion valve 100 is closed.

In addition, the spring can press against the bearing 26 to prevent the spring sleeve from sliding along the axial direction, so that the matching reliability of the valve needle 23 and the valve port 11 of the electronic expansion valve 100 is ensured when the electronic expansion valve 100 is closed, and the leakage of the electronic expansion valve 100 is prevented.

When the valve rod 21 is driven by the rotor assembly to move in the direction deviating from the valve port 11, the valve rod 21 drives the spring sleeve to move in the direction deviating from the valve port 11 through the limit matching part 211, and the spring sleeve drives the valve needle 23 to move in the direction deviating from the valve port 11 through the bearing 26, so that the electronic expansion valve 100 is opened.

In a further embodiment of the present utility model, referring to fig. 6 and 10, the spring housing is fixedly connected by welding after overlapping the bushing 25, and a weld scar is formed at the overlap joint after welding the spring housing and the bearing 26, the orthographic projection of the weld scar is disposed radially inside the orthographic projection of the spring housing, that is, the outer circumferential surface of the weld scar is disposed at a distance from the outer circumferential wall of the spring housing in the radial direction, and the distance between the outer circumferential surface of the weld scar and the central axis of the switching member 51 is smaller than the distance between the outer circumferential wall of the spring housing and the central axis of the switching member 51, so as to prevent the weld scar from contacting the valve housing 15 to cause the spring housing to be stuck when moving.

With further reference to fig. 10, the axial dimension of the weld bead is less than the sum of the axial dimension e of the bushing 25 protruding from the spring pocket tip and the axial dimension f of the spring pocket tip, preferably e=0.5, f=1.2, to ensure that the weld bead can cover the lap joint between the spring pocket and the bushing 25, improving the strength of the connection between the bushing 25 and the spring pocket.

In other embodiments of the present utility model, the elastic member 22 may abut against the valve needle 23, so long as the valve rod 21 can drive the valve needle 23 to move synchronously.

In some embodiments of the present utility model, the end of the switching member 51 near the valve port 11 is provided with a relief space, when the valve rod 21 is driven by the mover assembly to move in a direction away from the valve port 11, the valve rod 21 may drive the spring housing to move in a direction away from the valve port 11, and at least a portion of the spring housing may move into the relief space of the switching member 51, so as to reduce the axial dimension of the electronic expansion valve 100.

Referring to fig. 6 and 8, in some embodiments of the present utility model, a first gap 143 is provided between the mount 24 and the inner wall of the valve housing 15, and the mount 24 is provided with a balance hole communicating the inner space of the mount 24 with the first gap 143.

Specifically, in the radial direction, a first gap 143 is formed between the mount 24 and the valve body 14, and a balance hole is formed in a sidewall of the mount 24 in the circumferential direction, the balance hole being provided through the sidewall of the mount 24 to communicate an inner space of the mount 24 with the first gap 143.

When the valve needle 23 opens the valve port 11 to enable liquid to pass through the electronic expansion valve 100, part of the liquid flowing into the first gap 143 can flow into the mounting seat 24 through the balance hole, so that the purpose of pressure relief is achieved, the pressure of the liquid flowing through the electronic expansion valve 100 is reduced, the stability of the internal pressure of the electronic expansion valve 100 is ensured, the normal operation of the electronic expansion valve 100 is ensured, the service life of the electronic expansion valve 100 is prolonged, meanwhile, turbulence generated when the liquid flows through the electronic expansion valve 100 can be reduced, and noise generated when the electronic expansion valve 100 is opened is effectively reduced.

Further, in order to ensure that the pressure of the liquid can be quickly balanced after the liquid enters the electronic expansion valve 100, to reduce the fluctuation of the liquid pressure in the thermal management system, it is necessary to make the cross-sectional area of the balance hole larger than that of the first gap 143, wherein the diameter of the balance hole is set to d, the diameter of the first channel for the mount 24 is set to c, and the diameter of the mount 24 is set to b, and then the cross-sectional area of the balance hole satisfies the following relational expression: (pi d) ² /4)＞π(c ² -b ² ) Preferably, c=Φ6.2, b=Φ6.1, d=Φ1 to ensure the stability of the internal pressure of the electronic expansion valve 100 and to ensure the normal operation of the electronic expansion valve 100.

In some embodiments of the utility model, referring to fig. 6, 7 and 8, the valve body 14 is provided with a guide channel 142 for guiding the direction of movement of the valve needle assembly 20, and the valve needle assembly 20 is provided with a mating portion 234, at least part of the mating portion 234 extending into the guide channel 142.

Specifically, a guide passage 142 is formed in the valve body 14, the mount 24 is disposed in the valve body 14, and a first gap 143 is formed between the mount 24 and an inner wall of the guide passage 142, and a second gap 144 is formed between the needle 23 and an inner wall of the guide passage 142, so that the mount 24 and the needle 23 move in the guide passage 142, and the needle 23 can move to the valve port 11 through the guide passage 142 to selectively open or close the valve port 11.

Further, the second gap 144 is smaller than the first gap 143, so that the guiding channel can further guide and limit the valve needle 23, the limiting effect of the guiding channel 142 on the valve needle 23 is improved, meanwhile, the smaller gap between the valve needle 23 and the guiding channel 142 can prevent the valve needle 23 from swinging in the guiding channel 142, and the matching effect of the valve needle 23 and the valve port 11 is ensured.

In some embodiments of the utility model, the guide channel 142 comprises a first channel and a second channel in communication, the first channel having a cross-sectional area greater than the cross-sectional area of the second channel, the mounting seat 24 being in sliding engagement with the first channel and the valve needle 23 being in sliding engagement with the second channel.

Specifically, the cross-sectional area of the first channel is larger than that of the second channel so as to facilitate the assembly of the valve needle 23 and the mounting seat 24 from the side away from the valve port 11 to the valve port 11, the mounting seat 24 is in sliding fit with the first channel after the assembly of the electronic expansion valve 100, a first gap 143 is formed between the mounting seat 24 and the first channel, the valve needle 23 is in sliding fit with the second channel, and a second gap 144 is formed between the valve needle 23 and the second channel, and the size of the first gap 143 is larger than the size of the second gap 144.

Preferably, the radial dimension of the first gap 143 on one side may be configured to be 0.05mm, the radial dimension of the second gap 144 on one side may be configured to be 0.025mm, when the electronic expansion valve 100 is opened, the liquid flows into the second channel from the valve port 11 through the communication channel, the dimension of the second gap 144 is smaller than the dimension of the first gap 143, so that the pressure of the liquid flowing into the electronic expansion valve 100 can be reduced, and the normal operation of the electronic expansion valve 100 is ensured.

Referring to fig. 6 and 9, in some embodiments of the present utility model, the outer diameter of the mating portion of the mounting seat 24 and the first channel is D1, the length of the mounting seat 24 extending into the first channel is L1, the ratio of the length L1 to the outer diameter D1 is a first aspect ratio, and during the movement of the valve needle assembly 20, the first aspect ratio falls within the following ranges: 0.8 to 1.4.

Specifically, in the process that the spring sleeve moves in the first channel, the length L1 of the spring sleeve extending into the first channel can be changed, the axial dimension of the spring sleeve can be reasonably set according to the outer diameter D1 of the spring sleeve by enabling the first length-diameter ratio to be 0.8-1.4, excessive eccentricity of the valve needle assembly 20 and the valve port 11 caused by undersize of the axial dimension of the spring sleeve is prevented, and the matching effect of the valve needle assembly 20 and the valve port 11 is ensured.

Referring to fig. 6 and 11, in some embodiments of the present utility model, the outer diameter of the mating portion 234 of the valve needle 23 that slidingly mates with the second channel is D2, the length of the portion of the mating portion 234 that protrudes into the second channel is L2, and the ratio of the length L2 to the outer diameter D2 is a second aspect ratio, and during movement of the valve needle assembly 20, the ratio of the second aspect ratio falls within the following ranges: 0.4 to 1.6.

Specifically, in the process of moving the valve needle 23 in the second channel, the length of the portion of the matching portion 234 extending into the second channel may be changed, and by making the second aspect ratio fall into 0.4-1.6 in the process of moving the valve needle assembly 20, the axial dimension of the matching portion 234 may be reasonably designed according to the outer diameter D2 of the valve needle 23, so as to prevent the valve needle 23 and the valve port 11 from being excessively eccentric due to the too small axial dimension of the matching portion 234, and ensure the matching effect of the valve needle assembly 20 and the valve port 11. In some embodiments of the utility model, referring to fig. 1 and 2, the valve port 11 includes a first portion 111 and a second portion 112, the first portion 111 being located on a side of the second portion 112 closer to the valve needle 23, the cross-sectional area of the first portion 111 gradually decreasing in a direction away from the valve needle 23, the cross-sectional area of the second portion 112 gradually increasing, and an outer wall surface of the valve needle 23 being in contact with the first portion 111 when the valve needle 23 fully closes the valve port 11.

Specifically, as shown in fig. 2, the first portion 111 is disposed at an end of the valve port 11 near the valve stem 21, the second portion 112 is disposed at an end distant from the valve stem 21, the first portion 111 communicates with the second portion 112, and the cross-sectional area of the valve port 11 is smallest at a position where the first portion 111 is connected with the second portion 112, by controlling the volume of the valve needle 23 inserted into the valve port 11 to control the opening and closing of the electronic expansion valve 100 and the opening degree of the electronic expansion valve 100, when the electronic expansion valve 100 fully closes the valve port 11, the volume of the valve needle 23 inserted into the valve port 11 is largest, and the outer wall surface of the valve needle 23 contacts with the first portion 111 to achieve a sealing engagement, thereby closing the electronic expansion valve 100 and preventing liquid from flowing into the electronic expansion valve 100.

Referring to fig. 1 to 3, the electronic expansion valve 100 is opened by driving the valve needle 23 to move in a direction away from the valve port 11 to release the sealing engagement between the valve needle 23 and the first portion 111, and the liquid flows to the first portion 111 through the second portion 112, so that the cross-sectional area of the second portion 112 gradually decreases during the flow of the liquid to the first portion 111, thereby preventing the excessive pressure of the liquid flowing into the electronic expansion valve 100.

Further, by driving the needle 23 gradually to move in a direction away from the valve port 11 to gradually reduce the volume of the needle 23 inserted into the valve port 11, and in a direction away from the second portion 112, the cross-sectional area of the first portion 111 gradually increases, so that the opening degree of the electronic expansion valve 100 gradually increases, thereby realizing control of the opening degree of the electronic expansion valve 100 by controlling the area of the needle 23 inserted into the valve port 11.

In some embodiments of the utility model, referring to fig. 1 and 4, the valve needle 23 comprises, in a direction towards the valve port 11, a body portion 231, a transition portion 232 and a guide portion 233 arranged in sequence, the body portion 231 cooperating with the elastic member 22, the cross-sectional areas of both the transition portion 232 and the guide portion 233 decreasing gradually in a direction towards the valve port 11, the transition portion 232 being adapted to abut against the first portion 111.

Specifically, the body portion 231 is fixedly connected with the inner ring of the bearing 26, and the body portion 231 is in abutting fit with the elastic member 22 through the bearing 26, one end of the body portion 231, which faces away from the elastic member 22, is fixedly connected with the fitting portion 234, the transition section 232 is connected to the end of the fitting portion 234, which is close to the valve port 11, along the direction in which the first portion 111 of the valve port 11 extends toward the second portion 112, the cross-sectional area of the transition section 232 is gradually reduced, and the peripheral side wall of the transition section 232 can be in abutting fit with the first portion 111 to seal the valve port 11, so that the valve port 11 is fully closed.

Further, the guiding portion 233 is connected to the end of the transition section 232 near the second portion 112, along the direction in which the first portion 111 of the valve port 11 extends toward the second portion 112, the cross-sectional area of the guiding portion 233 gradually decreases, and when the valve stem 21 drives the valve needle 23 to move toward the valve port 11, the guiding portion 233 can play a guiding role, so that the valve needle 23 is inserted into the valve port 11, and meanwhile, the guiding portion 233 can play a turbulence role, so as to reduce the pressure of the liquid flowing toward the electronic expansion valve 100.

As shown in fig. 4, in some embodiments of the present utility model, the engaging portion 234 is provided with a clamping boss 2341, the clamping boss 2341 is disposed radially outside the engaging portion 234, and the clamping boss 2341 extends from the engaging portion 234 in a radial direction away from the engaging portion 234 to form a boss structure, and the clamping boss 2341 is in stop-fit with an inner ring of the bearing 26 in an axial direction, so as to prevent the valve needle 23 from moving into the mounting seat 24 when being subjected to liquid pressure, and ensure the sealing effect of the valve needle 23 on the valve port 11.

According to the thermal management system provided by the utility model, the electronic expansion valve 100 is arranged, and the valve needle assembly 20 can reciprocate by matching and linking the rotor assembly and the valve needle assembly 20, so that the valve port 11 is selectively opened and closed, and the maximum valve opening capability of the electronic expansion valve 100 when the valve port 11 is completely closed to the valve port 11 is ensured by constructing the rotor assembly to be less than-4.3 mm < A-B <0.6mm, so that the valve needle assembly 20 can overcome the friction force between the valve needle assembly 20 and the valve port 11 and move in the direction away from the valve port 11 along the axial direction, the valve opening capability of the electronic expansion valve 100 is improved, and the control precision of the electronic expansion valve 100 is improved.

According to the vehicle provided by the utility model, the vehicle comprises the thermal management system, and the electronic expansion valve 100 is arranged in the thermal management system, so that the valve needle assembly 20 can reciprocate by matching and linking the rotor assembly and the valve needle assembly 20, the valve port 11 is selectively opened and closed, the maximum valve opening capability of the electronic expansion valve 100 when the valve port 11 is completely closed to the valve port 11 is completely opened is ensured by constructing the rotor assembly to meet the condition that the rotor assembly is less than-4.3 mm < A-B <0.6mm, the valve needle assembly 20 can overcome the friction force between the valve needle assembly 20 and the valve port 11 and move along the axial direction to the direction away from the valve port 11, the valve opening capability of the electronic expansion valve 100 is improved, and the control precision of the electronic expansion valve 100 is improved.

In the description of the present specification, reference to the terms "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (14)

1. An electronic expansion valve, comprising:

a valve housing assembly provided with a receiving cavity (12) and a valve port (11), the valve port (11) being in communication with the receiving cavity (12);

a valve needle assembly (20), wherein the valve needle assembly (20) is arranged in the accommodating cavity (12) in a reciprocating manner so as to open or close the valve port (11);

The stator assembly (30) and the rotor assembly are arranged in the valve housing assembly, the rotor assembly is arranged in the accommodating cavity (12), the stator assembly (30) and the rotor assembly are matched so that the rotor assembly can rotate, and the rotor assembly is matched with the valve needle assembly (20) to drive the valve needle assembly (20) to reciprocate;

the stator assembly (30) has a first center line, the mover assembly has a second center line, the first center line and the second center line are respectively perpendicular to the rotation axis of the mover assembly, the valve housing assembly has a first reference surface perpendicular to the rotation axis of the mover assembly, the first reference surface is positioned on one side of the stator assembly (30) facing the valve port (11), the distance between the first center line and the first reference surface is A, the distance between the second center line and the first reference surface is B, and the mover assembly is configured to satisfy the following relation: -4.3mm < A-B <0.6mm.

2. The electronic expansion valve according to claim 1, characterized in that, in the fully closed state of the valve port (11), the electronic expansion valve satisfies the following relation: -0.6mm < A-B <0.6mm.

3. The electronic expansion valve of claim 1, wherein the valve housing assembly comprises:

a valve seat (13), the valve seat (13) being provided with an assembly chamber and a plurality of fluid passages (131), the plurality of fluid passages (131) being in communication with the assembly chamber, respectively;

a valve body (14), the valve body (14) being mounted in the assembly chamber, the valve body (14) being provided with the valve port (11) and a communication flow passage (141) communicating with the valve port (11), the valve port (11) and the communication flow passage (141) communicating with different fluid passages (131), respectively;

-a valve housing (15), said valve housing (15) cooperating with at least one of said valve seat (13) and said valve body (14) to define a containing cavity (12).

4. An electronic expansion valve according to claim 3, characterized in that the valve housing (15) is an interference fit with the valve body (14).

5. Electronic expansion valve according to claim 4, characterized in that the height of the mating portion (234) between the valve housing (15) and the valve body (14) is 0.8-1.5 mm in a direction parallel to the axis of rotation of the mover assembly.

6. An electronic expansion valve according to claim 3, characterized in that the clearance between the mover assembly and the inner wall of the valve housing (15) has a value of 0.35mm to 0.4mm.

7. An electronic expansion valve according to claim 3, characterized in that the valve body (14) is provided with a guide channel (142) for guiding the direction of movement of the valve needle assembly (20), the valve needle assembly (20) being provided with a mating portion (234), at least part of the mating portion (234) protruding into the guide channel (142).

8. The electronic expansion valve according to claim 7, wherein the outer diameter of the mating portion (234) is D1, the length of the portion of the mating portion (234) extending into the guide channel (142) is L1, the ratio of the length L1 to the outer diameter D1 is an aspect ratio, and the aspect ratio falls within the following ranges during movement of the valve needle assembly (20): 0.4 to 1.6.

9. The electronic expansion valve according to any of claims 1-8, further comprising a switching assembly (50), said switching assembly (50) being secured within the receiving chamber (12), said switching assembly (50) cooperating with said valve needle assembly (20) such that said valve needle assembly (20) is synchronously movable upon rotation, said mover assembly cooperating with said valve needle assembly (20) to drive rotation of said valve needle assembly (20).

10. The electronic expansion valve of claim 9, wherein the valve needle assembly (20) comprises a valve stem (21), an elastic member (22) and a valve needle (23), the elastic member (22) being disposed between a first end of the valve stem (21) and the valve needle (23), the valve stem (21) moving to move the valve needle (23) to open or close the valve port (11), the valve stem (21) being fixed to the mover assembly and cooperating with the switching assembly (50).

11. The electronic expansion valve according to claim 10, wherein the valve needle assembly (20) further comprises a mounting seat (24), the valve rod (21) is matched with the mounting seat (24), the elastic piece (22) is arranged in the mounting seat (24), one end of the elastic piece (22) is abutted against the valve rod (21) and the other end is abutted against the mounting seat (24), and the valve needle (23) is arranged on the mounting seat (24).

12. The electronic expansion valve according to claim 11, characterized in that a first gap (143) is provided between the mounting seat (24) and the inner wall of the valve housing assembly, the mounting seat (24) being provided with a balancing hole, which communicates the inner space of the mounting seat (24) with the first gap (143).

13. A thermal management system comprising an electronic expansion valve according to any of claims 1-12.

14. A vehicle comprising a thermal management system according to claim 13.