CN205639792U - Electric expansion valve - Google Patents

Abstract

The utility model provides an electronic expansion valve, which belongs to the technical field of flow control, and includes a valve body, a needle valve, an inlet and an outlet. The valve body is provided with a coil, a control cavity and an execution cavity, and the coil is arranged around the control cavity. The control chamber communicates with the execution chamber, and a slidable armature and a spring for resetting the armature are arranged in the control chamber, the armature is fixedly connected with the needle valve, and the inlet and outlet They are respectively communicated with the execution chamber, and the needle valve can slide in the execution chamber so as to realize the connection or disconnection of the inlet and the outlet. The electronic expansion valve can not only control the opening and closing of the electronic expansion valve, but also effectively control the opening of the electronic expansion valve, and can also greatly improve the control accuracy, effectively making up for the defects of the prior art.

Description

Electronic expansion valve

technical field

The utility model relates to the technical field of flow control, in particular to an electronic expansion valve.

Background technique

Most of the existing expansion valves are H-type expansion valves, and their working principles are as follows: 1) When the automobile air-conditioning refrigeration system is just started or the heat load is heavy, the pressure of the refrigerant in the temperature sensing element is relatively high. The diaphragm overcomes the spring force and the pressure of the refrigerant at the outlet of the evaporator, and pushes the ejector rod and the transmission rod downward to open the ball valve until a balanced position, which increases the flow of high-pressure refrigerant into the evaporator; (2) when the car air conditioner When the heat load of the refrigeration system is small or needs to be closed, the pressure of the refrigerant in the temperature sensing element becomes smaller, and the sum of the spring force and the pressure of the refrigerant at the outlet of the evaporator is greater than the diaphragm pressure of the temperature sensing element, so the ejector rod and the transmission rod are upward Move until an equilibrium position to close the opening of the ball valve, which reduces the flow of high-pressure refrigerant into the evaporator.

Therefore, the existing expansion valve mainly uses the temperature sensing bulb to control the opening degree of the expansion valve (that is, the opening degree of the expansion valve), and the control accuracy is generally not high.

Utility model content

The purpose of this utility model is to provide an electronic expansion valve to improve the above problems.

The utility model is achieved in that:

The electronic expansion valve includes a valve body, a needle valve, an inlet and an outlet, the valve body is provided with a coil, a control chamber and an execution chamber, the coil is arranged around the control chamber, the control chamber communicates with the execution chamber, the A slidable armature and a spring for resetting the armature are arranged in the control chamber, the armature is fixedly connected with the needle valve, the inlet and outlet are communicated with the execution chamber respectively, and the needle valve can be Sliding inside the chamber enables connection or disconnection of the inlet and outlet.

Preferably, the spring is arranged at an end of the control chamber away from the execution chamber, the spring is in a compressed state, and one end of the spring is against the inner wall of the control chamber, and the other end is against the armature.

The purpose of arranging the spring in this way is that it is simple in structure, easy to assemble and disassemble, and can effectively realize the reset of the armature.

Preferably, the spring is made of spring steel.

The purpose of choosing spring steel is that it has good comprehensive properties, such as mechanical properties, anti-ballistic properties, fatigue properties, hardenability, physical and chemical properties, which can ensure the normal operation of the spring and prolong the service life of the spring.

Preferably, the spring is arranged in the control chamber near one end of the execution chamber, one end of the spring is fixedly connected to the inner wall of the control chamber, and the other end is fixedly connected to the armature.

The purpose of arranging the spring in this way is that it has the characteristics of simple structure, convenient assembly and disassembly, and can effectively realize the reset of the armature.

Preferably, the armature is made of soft iron.

The purpose of choosing soft iron is that it is easy to be magnetized when put into the magnetic field, and demagnetized immediately after taking out the magnetic field. The above characteristics make the armature quickly magnetized after the coil is energized to generate a magnetic field, thereby being driven by the magnetic field, and then driving The needle valve moves to open the electronic expansion valve. After the coil is powered off, the armature can demagnetize quickly and is no longer affected by the magnetic force, so as to return to the original position under the force of the spring, and then drive the needle valve to reset, thereby Close the electronic expansion valve.

Preferably, the valve body and the needle valve are made of stainless steel.

The purpose of choosing stainless steel is to prolong the service life of the electronic expansion valve as much as possible.

Preferably, a through hole matching the needle valve is provided in the armature, the length direction of the through hole is the same as the length direction of the armature, the needle valve is located in the through hole, and the needle valve is located in the through hole. One end of the valve protrudes from the through hole and is slidably connected in the execution chamber.

The purpose of arranging the armature and the needle valve in this way is to increase the contact area between the two, thereby improving the connection strength between the two, so as to ensure the normal operation of the electronic expansion valve.

Preferably, the needle valve is screwed to the armature.

The purpose of adopting threaded connection is that it has the characteristics of stable and reliable connection, and very convenient installation and disassembly.

Preferably, a sealing ring is provided on the inner wall of the execution chamber close to the control chamber, and the inner wall of the sealing ring is in close contact with the outer wall of the needle valve.

The purpose of setting the sealing ring is to effectively prevent the fluid from seeping into the control chamber from between the inner wall of the actuator chamber and the outer wall of the needle valve, so as to ensure the normal operation of the electronic expansion valve.

Preferably, the coil is electrically connected to a wiring socket, and the wiring socket is located outside the valve body.

The purpose of setting the wiring socket is to facilitate the connection of the coil and the external power supply to obtain the corresponding current and voltage.

The beneficial effects of the utility model are:

The electronic expansion valve uses the principle of electromagnetic induction to drive the movement of the needle valve, which can not only control the opening and closing of the electronic expansion valve, but also effectively control the opening of the electronic expansion valve, and can also greatly improve the control accuracy, effectively The defects of the prior art are made up.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following drawings will be briefly introduced in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention. Therefore, it should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained according to these drawings without creative work.

Fig. 1 is a schematic structural diagram of the electronic expansion valve provided by the first embodiment of the present invention;

Fig. 2 is a cross-sectional view of the valve body provided by the first embodiment of the present invention.

Summary of reference signs:

Valve body 100; control cavity 110; execution cavity 120;

Coil 200; Armature 300; Needle valve 400;

spring 500; inlet 600; outlet 700;

Wiring socket 800; sealing ring 900.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the utility model more clear, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the utility model. Obviously, the described The embodiments are some embodiments of the present utility model, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" The orientation or positional relationship indicated by etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship that is usually placed when the product of the utility model is used. It is only for the convenience of describing the utility model and simplifying the description, rather than Any indication or implication that a referenced device or element must have a particular orientation, be constructed, and operate in a particular orientation should not be construed as limiting the invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions, and should not be construed as indicating or implying relative importance.

In the description of the present utility model, it should also be noted that, unless otherwise specified and limited, the terms "setting", "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection , can also be detachably connected, or integrally connected; can be mechanically connected, can also be electrically connected; can be directly connected, can also be indirectly connected through an intermediary, and can be internal communication between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

The first embodiment, referring to Fig. 1-2, the electronic expansion valve includes a valve body 100, a needle valve 400, an inlet 600 and an outlet 700, and the valve body 100 is provided with a coil 200, a control chamber 110 and an execution chamber 120, so The coil 200 is arranged around the control cavity 110, the control cavity 110 communicates with the execution cavity 120, the control cavity 110 is provided with a slidable armature 300 and a spring 500 for resetting the armature 300, the The armature 300 is fixedly connected with the needle valve 400, the inlet 600 and the outlet 700 are respectively communicated with the actuating chamber 120, and the needle valve 400 can slide in the actuating chamber 120 to realize the connection or disconnection of the inlet 600 and the outlet 700 .

Wherein, the valve body 100 and the needle valve 400 are made of metal to ensure the mechanical strength of the two; The body 100 is in the shape of a circular tube with both ends open. The coil 200 can be electrically connected to an external power source to obtain current; The axes are coincident; the armature 300 is made of magnetic material so as to be driven by the magnetic field generated when the coil 200 is charged; the function of the spring 500 is to return the armature 300 to its original position after the coil 200 is powered off; The purpose of the fixed connection between the armature 300 and the needle valve 400 is to make the armature 300 indirectly drive the movement of the needle valve 400 after being driven; the inlet 600 communicates with the side wall of the execution chamber 120, and the outlet 700 is arranged on the The end of the actuator chamber 120 away from the control chamber 110; the outlet 700 communicates with a fuel injector, and the structure of the fuel injector is set with reference to the fuel injector of the engine.

The electronic expansion valve can be applied to various air-conditioning and refrigeration systems, especially in automobile air-conditioning and refrigeration systems. Under the action of the spring 500, it is always against the end of the control chamber 110 close to the execution chamber 120. At this time, the needle valve 400 fills the entire execution chamber 120, so that the inlet 600 and the outlet 700 are in a disconnected state, that is, the fluid cannot pass through the electronic expansion valve; work At this time, the coil 200 is in the energized state. According to the principle of electromagnetic induction, a magnetic field will be generated around the coil 200, and the above-mentioned magnetic field will drive the armature 300 to move to the end away from the actuator chamber 120, so that the needle valve 400 will also move in the actuator chamber 120. Slide inward until the magnetic force received by the armature 300 is equal to the force of the spring 500. At this time, the inlet 600 and the outlet 700 are in a communication state, that is, the fluid can pass through the electronic expansion valve.

In the above process, the voltage and current provided by the external power supply are changed, so the intensity of the current passed into the coil 200 is also changed, so that the strength of the magnetic force generated by the coil 200 is also changed, and then the needle valve 400 is in the actuator chamber 120. The degree of sliding also changes, so that the degree of communication between the inlet 600 and the outlet 700 (that is, the opening of the electronic expansion valve) also changes, so the electronic expansion valve can control its own opening, which makes up for the existing H-type expansion valve. Disadvantages of the valve. At the same time, the electronic expansion valve uses the principle of electromagnetic induction to control its own opening and closing. Compared with the existing expansion valve that is controlled by a temperature-sensing package, the accuracy is higher.

In the actual design and manufacture process of the electronic expansion valve, the spring 500 can be set in various structures and forms, as long as it can realize the reset effect of the armature 300 and the needle valve 400 . In this embodiment, the spring 500 is disposed at the end of the control chamber 110 away from the actuator chamber 120 , the spring 500 is in a compressed state, and one end of the spring 500 is against the inner wall of the control chamber 110 , and the other end is against the armature 300 .

Wherein, the spring 500 is a helical equidistant spring 500, which has the characteristics of uniform force and stable operation; the outer diameter of the spring 500 is slightly smaller than the inner diameter of the control cavity 110, so as to ensure that the spring 500 always expands and contracts along its own axis direction , to improve its stability at rest and stretching.

The purpose of setting the spring 500 in this way is that it is simple in structure, easy to assemble and disassemble, and can effectively realize the reset of the armature 300 .

In the actual design and manufacturing process of the electronic expansion valve, the spring 500 can be made of various metal materials, as long as it has excellent elastic properties. In this embodiment, the spring 500 is made of spring steel.

Wherein, the spring steel can be divided into carbon spring steel and alloy spring steel according to chemical composition, and the technical solution adopts alloy spring steel, such as silicon-manganese spring steel or silicon-chromium spring steel.

The purpose of selecting spring steel is that it has good comprehensive properties, such as mechanical properties, anti-ballistic properties, fatigue properties, hardenability, physical and chemical properties, which can ensure the normal operation of the spring 500 and prolong the service life of the spring 500.

During the actual design and manufacture of the electronic expansion valve, the armature 300 can be made of various magnetic materials. In this embodiment, the armature 300 is made of soft iron.

Wherein, the soft iron is pure iron, so named because of its softness.

The purpose of choosing soft iron is that it is easy to be magnetized when placed in a magnetic field, and demagnetized immediately after taking out the magnetic field. The above characteristics enable the armature 300 to be magnetized quickly after the coil 200 is energized to generate a magnetic field, thereby being driven by the magnetic field. Then the needle valve 400 is driven to move, thereby opening the electronic expansion valve, and after the coil 200 is powered off, the armature 300 can be demagnetized quickly and is no longer subjected to magnetic force, so as to return to the original position under the force of the spring 500, and then Drive the needle valve 400 to reset, thereby closing the electronic expansion valve.

During the actual design and manufacture of the electronic expansion valve, the valve body 100 and the needle valve 400 can be made of various metal materials. In this embodiment, the valve body 100 and the needle valve 400 are made of stainless steel.

The purpose of choosing stainless steel is to prolong the service life of the electronic expansion valve as much as possible. The electronic expansion valve is mainly used to control the flow of fluid, so the valve body 100 and needle valve 400 are in contact with various fluids for a long time, so they are easily corroded, and the valve body 100 and needle valve 400 made of stainless steel can be Effectively delay corrosion and rust, prolong the service life of the electronic expansion valve.

In this embodiment, the armature 300 is provided with a through hole matching the needle valve 400, the length direction of the through hole is the same as the length direction of the armature 300, and the needle valve 400 is located in the through hole One end of the needle valve 400 protrudes from the through hole and is slidably connected to the execution chamber 120 .

Wherein, the through hole is a cylindrical hole and runs through the length direction of the entire armature 300, and the outer diameter of the needle valve 400 is slightly smaller than the inner diameter of the through hole, so that the needle valve 400 can easily enter the through hole; The end of the 400 away from the actuator cavity 120 is flush with the corresponding end of the through hole, so as to improve the flatness of its structure.

The purpose of disposing the armature 300 and the needle valve 400 in this way is to increase the contact area between the two, and further improve the connection strength between the two, so as to ensure the normal operation of the electronic expansion valve.

In the actual design and manufacture process of the electronic expansion valve, the needle valve 400 and the armature 300 can be connected in various ways, as long as the stability of the connection can be ensured. In this embodiment, the needle valve 400 is screwed to the armature 300 .

Specifically, external threads are provided on the outer wall of the needle valve 400 corresponding to the armature 300 , and internal threads matching the external threads are provided on the inner wall of the through hole of the armature 300 .

The purpose of adopting threaded connection is that it has the characteristics of stable and reliable connection, and very convenient installation and disassembly.

It should be noted that the above threaded connection may also be replaced by welding.

In this embodiment, a sealing ring 900 is provided on the inner wall of the execution chamber 120 close to the control chamber 110 , and the inner wall of the sealing ring 900 is in close contact with the outer wall of the needle valve 400 .

Wherein, the inner wall of the execution cavity 120 is provided with an annular groove, and the sealing ring 900 is arranged in the annular groove; the sealing ring 900 is an O-ring, and the O-ring has low cost and good sealing effect. nice features.

The purpose of setting the sealing ring 900 is to effectively prevent fluid from seeping into the control chamber 110 from between the inner wall of the actuator chamber 120 and the outer wall of the needle valve 400 , so as to ensure the normal operation of the electronic expansion valve.

In this embodiment, the coil 200 is electrically connected to a wiring socket 800 , and the wiring socket 800 is located outside the valve body 100 .

Wherein, the valve body 100 is provided with a perforation, and the two ends of the coil 200 protrude from the perforation and are connected to the wiring socket 800; the wiring socket 800 is used to connect an external power source so that the coil 200 is energized.

The purpose of providing the wiring socket 800 is to facilitate the connection of the coil 200 to an external power source to obtain corresponding current and voltage.

The electronic expansion valve uses the principle of electromagnetic induction to drive the movement of the needle valve 400, which can not only control the opening and closing of the electronic expansion valve, but also effectively control the opening of the electronic expansion valve, and can also greatly improve the control accuracy. The defects of the prior art are effectively made up.

The second embodiment, the device provided by the embodiment of the present utility model, its realization principle and the technical effect produced are the same as those of the foregoing embodiments. For a brief description, the parts not mentioned in the device embodiment can refer to the corresponding embodiments in the foregoing embodiments content.

In this embodiment, the spring 500 is disposed in the control chamber 110 near the end of the actuator chamber 120 , one end of the spring 500 is fixedly connected to the inner wall of the control chamber 110 , and the other end is fixedly connected to the armature 300 .

Wherein, the two ends of the spring 500 are respectively detachably connected to the inner wall of the control chamber 110 and the end of the armature 300 for disassembly; when the electronic expansion valve is in operation, the spring 500 is in a natural state, and the When the electronic expansion valve is working, the spring 500 is in a stretched state, so that it has a reset capability.

The purpose of setting the spring 500 in this way is that it has the characteristics of simple structure, convenient assembly and disassembly, and can effectively realize the reset of the armature 300 .

The above descriptions are only preferred embodiments of the utility model, and are not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (10)

1. an electric expansion valve, it is characterised in that include valve body, needle-valve, entrance and Outlet, be provided with in described valve body coil, control chamber and perform chamber, described coil around Controlling chamber to arrange, described control chamber connects with described execution chamber, and described control intracavity is provided with Slidably armature and for making the spring that armature resets, described armature is fixed with described needle-valve Connecting, described entrance and exit connects with execution chamber respectively, and described needle-valve can perform intracavity Slide thus realize connection or the disconnection of entrance and exit.

Electric expansion valve the most according to claim 1, it is characterised in that described spring Being arranged at the one end controlling chamber away from execution chamber, described spring is in compressive state, and one end Propping up control cavity wall, the other end props up armature.

Electric expansion valve the most according to claim 2, it is characterised in that described spring For spring steel material.

Electric expansion valve the most according to claim 1, it is characterised in that described spring Being arranged at the one end controlling intracavity near execution chamber, described spring one end is fixedly connected on described Controlling the inwall in chamber, the other end is fixedly connected on described armature.

Electric expansion valve the most according to claim 1, it is characterised in that described armature For soft iron material.

Electric expansion valve the most according to claim 5, it is characterised in that described valve body It is stainless steel with needle-valve.

Electric expansion valve the most according to claim 6, it is characterised in that described armature Inside it is provided with the through hole mated with described needle-valve, the length direction of described through hole and the length of armature Degree direction identical, described needle-valve is positioned at described through hole, described needle-valve one end stretch out through hole and It is slidably connected to described execution intracavity.

Electric expansion valve the most according to claim 7, it is characterised in that described needle-valve Threaded with described armature.

Electric expansion valve the most according to claim 1, it is characterised in that described execution On the inwall in chamber, the position controlling chamber is provided with sealing ring, the inwall of described sealing ring with The outer wall of described needle-valve fits tightly.

Electric expansion valve the most according to claim 1, it is characterised in that described coil Being electrically connected with connector socket, described connector socket is positioned at outside valve body.