CN113565816B - safety valve - Google Patents

Abstract

The invention discloses a safety valve, which comprises a shell, a valve core and a reset piece, wherein a cavity is arranged in the shell, a liquid inlet channel and a liquid outlet channel are arranged on the shell, the axial position of the valve core along the cavity is adjustable, the valve core is provided with a first position and a second position, the first position is used for cutting off the liquid inlet channel and the liquid outlet channel, the second position is used for communicating the liquid inlet channel and the liquid outlet channel, the valve core is provided with a first end facing the liquid inlet channel, the first end is provided with a protruding part and a ring groove, the reset piece is arranged in the cavity, the reset piece is abutted against the second end of the valve core, and the reset piece is used for resetting the valve core from the second position to the first position. The safety valve has the characteristics of small opening overshoot pressure, simple structure, stable flow, safety and reliability.

Description

safety valve

Technical field

The present invention relates to the technical field of hydraulic control valves, and in particular, to a safety valve.

Background technique

The safety valve is an automatic pressure relief device driven by medium pressure. Its function is to limit the pressure of the hydraulic system to not exceed the safety pressure of the system.

Contents of the invention

The present invention is based on the inventor's discovery and understanding of the following facts and problems:

When the inlet pressure of the safety valve is constant, the flow rate of the safety valve is mainly determined by the opening of the valve core. That is, the greater the opening of the valve core, the greater the flow through the safety valve. Since the valve core opening power is completely provided by the inlet hydraulic pressure, during the valve core opening process, the overflow from the valve core opening to the valve core opening can meet the nominal flow requirements. The inlet pressure needs to have a certain increment. The inlet pressure The increment is called the opening overshoot pressure. If the opening overshoot pressure is too high, it will increase the hydraulic pressure on the safety valve and the hydraulic system where the safety valve is located, which is not conducive to the safety of the hydraulic system. In actual use, higher inlet hydraulic pressure is often required to increase the valve core opening, thereby increasing the safety valve flow. Therefore, the overshoot pressure of the safety valve is increased, which is not conducive to the safety of the hydraulic system.

The present invention aims to solve one of the technical problems in the related art, at least to a certain extent. To this end, embodiments of the present invention propose a safety valve with small opening overshoot pressure, stable liquid discharge, and safety and reliability.

A safety valve according to an embodiment of the present invention includes a housing, a valve core and a reset member. A chamber is provided in the housing, and a liquid inlet channel and a liquid outlet channel are provided on the housing. The chamber is connected to the Between the liquid inlet channel and the liquid outlet channel, the valve core is provided in the chamber, the valve core is adjustable along the axial position of the chamber and has a first position and a second position. In the first position, the valve core cuts off the liquid inlet channel and the liquid outlet channel. In the second position, the liquid inlet channel and the liquid outlet channel are connected, and the valve core has a direction facing the The first end of the liquid inlet channel is provided with a protrusion and an annular groove, and at least part of the protrusion is used for sealing insertion into the liquid inlet channel when the valve core is in the first position. To achieve separation between the liquid inlet channel and the chamber, the opening of the annular groove faces the liquid inlet channel, and the annular groove surrounds the outer peripheral side of the protruding portion, and the reset member is located on In the chamber, the reset member is in contact with the second end of the valve core, and the reset member is used to reset the valve core from the second position to the first position.

The safety valve according to the embodiment of the present invention has the characteristics of small opening overshoot pressure, simple structure, stable flow rate, safety and reliability.

In some embodiments, the first end of the valve core is provided with an annular flange, the annular flange surrounds the outer peripheral side of the protrusion, and the annular groove is formed between the protrusion and the between the annular flanges.

In some embodiments, in the first position, at least part of the peripheral wall of the annular flange seals and blocks the inlet of the liquid outlet channel.

In some embodiments, the length dimension of the protrusion along the axial direction of the chamber is greater than the length dimension of the annular flange along the axial direction of the chamber.

In some embodiments, a pressure stabilizing hole is provided in the protrusion, the opening of the pressure stabilizing hole faces the liquid inlet channel, and the pressure stabilizing hole extends along the central axis of the valve core.

In some embodiments, the safety valve further includes a pressure regulating plug, the pressure regulating plug is provided in the chamber, and the reset member is provided between the valve core and the pressure regulating plug, The axial position of the pressure-regulating plug is adjustable along the chamber to adjust the reset force of the reset member.

In some embodiments, the safety valve further includes a reset seat, the chamber includes a first section and a second section, the diameter of the first section is smaller than the diameter of the second section, and the valve core The guide is fitted in the first section, the reset piece and the reset seat are guided in the second section, and the reset seat is located between the valve core and the reset piece. The diameter of the seat is greater than the diameter of the first section.

In some embodiments, the reset seat is provided with a first protrusion, the pressure regulating plug is provided with a second protrusion, the return member is a spring, and one end of the return member is sleeved on the The other end of the reset member is sleeved on the outer peripheral side of the first protrusion and the outer peripheral side of the second protrusion.

In some embodiments, the housing includes a first housing and a second housing that are threadedly connected, a first section of the chamber is formed within the first housing, and a second section of the chamber is formed In the second housing, the pressure regulating plug is threadedly assembled in the second housing.

In some embodiments, the housing further includes a limiting plug, and the liquid inlet channel is provided in the limiting plug.

Description of drawings

Figure 1 is a schematic structural diagram of a safety valve according to an embodiment of the present invention.

Reference signs:

Housing 1, chamber 11, first section 111, second section 112, liquid inlet channel 12, liquid outlet channel 13, first shell 14, second shell 15, valve seat 16, valve core 2, first End 21, protruding part 211, pressure stabilizing hole 2111, annular groove 22, annular flange 23, return part 3, pressure regulating plug 4, second protrusion 41, reset seat 5, first protrusion 51, limiter Plug 6.

Detailed ways

Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and are not to be construed as limiting the present invention.

A safety valve according to an embodiment of the present invention is described below with reference to FIG. 1 .

The safety valve according to the embodiment of the present invention includes a housing 1, a valve core 2 and a reset member 3.

A chamber 11 is provided in the housing 1 . The housing 1 is provided with a liquid inlet channel 12 and a liquid outlet channel 13 . The chamber 11 is connected between the liquid inlet channel 12 and the liquid outlet channel 13 .

As shown in Figure 1, a liquid inlet channel 12 is provided on the left side of the housing 1, and the liquid inlet channel 12 extends in the left and right directions. The housing 1 is also provided with a liquid outlet channel 13, the liquid outlet channel 13 and the liquid inlet channel 12. There is a chamber 11 in between, and the liquid enters the chamber 11 through the liquid inlet channel 12 and then flows out from the liquid outlet channel 13.

The valve core 2 is located in the chamber 11. The valve core 2 is adjustable along the axial position of the chamber 11 and has a first position and a second position. In the first position, the valve core 2 cuts off the liquid inlet channel 12 and the liquid outlet. Channel 13, in the second position, the liquid inlet channel 12 and the liquid outlet channel 13 are connected, the valve core 2 has a first end 21 facing the liquid inlet channel 12, the first end 21 is provided with a protrusion 211 and an annular groove 22, at least The partial protrusion 211 is used to seal and insert into the liquid inlet channel 12 when the valve core 2 is in the first position to separate the liquid inlet channel 12 and the chamber 11. The opening of the annular groove 22 faces the liquid inlet channel 12, and the annular groove 22 faces the liquid inlet channel 12. 22 surrounds the outer peripheral side of the protruding portion 211 .

As shown in Figure 1, a valve core 2 is provided in the chamber 11. The valve core 2 can move left and right in the chamber 11. The valve core 2 has a first position at the left end of the chamber 11. In the first position, liquid is fed. Both the channel 12 and the liquid outlet channel 13 are cut off by the valve core 2. Liquid cannot flow in from the liquid inlet channel 12 or flow out from the liquid outlet channel 13. The valve core 2 moves a certain distance to the right in the chamber 11 and has a second position. When the valve core 2 is in the second position, the liquid flows into the chamber 11 from the liquid inlet channel 12 and flows out of the chamber 11 from the liquid outlet channel 13. The first end 21 of the valve core 2 is the left end, and a protrusion 211 is provided at the left end. The left end of the outlet 211 can be inserted into the liquid inlet channel 12 when the valve core 2 is in the first position, so that the liquid inlet channel 12 is closed. A valve seat 16 is also provided in the chamber 11, and the left end of the valve seat 16 is in contact with the valve core 2 The right end of the protruding portion 211 is in contact with the protruding portion 211, and a slope is provided at the contact point to reduce the wear of the safety valve and improve the service life of the safety valve. There is an annular groove 22 surrounding the outer periphery of the protruding portion 211. The annular groove 22 The opening is to the left. When the liquid flows out through the liquid outlet channel 13, the annular groove 22 can stabilize the liquid pressure and stabilize the force of the valve core 2.

The reset piece 3 is disposed in the chamber 11 and stops against the second end of the valve core 2. The reset piece 3 is used to reset the valve core 2 from the second position to the first position.

As shown in Figure 1, the second end of the valve core 2 is the right end of the valve core 2. The right end of the valve core 2 is resisted by a reset piece 3. The reset piece 3 provides a leftward reset force to the valve core 2, pushing the valve core 2 Reset from second position to first position.

The safety valve according to the embodiment of the present invention stabilizes the liquid pressure by providing an annular groove 22 on the end surface of the valve core 2 at the liquid outlet channel 13, and at the same time, a reset member 3 is provided to reset the valve core 2, thereby completing the control of the pressure at the liquid inlet channel 12. The adjustment and control of the liquid flow rate have the characteristics of small opening overshoot pressure, simple structure, stable flow rate, safety and reliability.

In some embodiments, the first end 21 of the valve core 2 is provided with an annular flange 23, the annular flange 23 surrounds the outer peripheral side of the protruding portion 211, and the annular groove 22 is formed between the protruding portion 211 and the annular flange 23. between.

As shown in Figure 1, an annular flange 23 is also provided on the outer periphery of the protruding portion 211. The outer peripheral surface of the annular flange 23 is flush with the outer peripheral surface of the valve core 2 and in contact with the inner peripheral surface of the chamber 11. The inner circumferential surface of the flange 23 and the outer circumferential surface of the protruding portion 211 are opposite and spaced to form an annular groove 22. When the valve core 2 moves to the left to the first position, the protruding portion 211 seals the liquid inlet channel 12, and the annular flange 23 The liquid outlet channel 13 is closed. When the valve core 2 moves to the right, the protruding portion 211 moves to the right with the valve core 2. The liquid inlet channel 12 opens, and the annular flange 23 moves to the right with the valve core 2, and the liquid is discharged. As the channel 13 opens, the liquid flows into the chamber 11 from the liquid inlet channel 12 and flows out of the chamber 11 from the liquid outlet channel 13. The flow rate changes with the speed of the valve core 2 moving to the right.

In some embodiments, in the first position, at least part of the peripheral wall of the annular flange 23 seals and blocks the inlet of the liquid outlet channel 13 .

As shown in Figure 1, the outer peripheral surface of the annular flange 23 is in contact with the inner peripheral surface of the chamber 11, and a part of the left end of the annular flange 23 coincides with the inlet of the closed liquid outlet channel 13. When the valve core 2 is in the first position, A part of the left end of the annular flange 23 seals the inlet of the liquid outlet channel 13. When the valve core 2 moves to the right, the annular flange 23 moves to the right, and the inlet of the liquid outlet channel 13 is opened, thus controlling the flow of liquid from the liquid outlet channel 13. of traffic.

In some embodiments, the length dimension of the protrusion 211 along the axial direction of the chamber 11 is greater than the length dimension of the annular flange 23 along the axial direction of the chamber 11 .

As shown in FIG. 1 , the length dimension of the protruding portion 211 in the left-right direction is larger than the length dimension of the annular flange 23 in the left-right direction. In other words, when the left end of the annular flange 23 abuts against the housing 1 , the protruding portion 211 The left end of the outlet portion 211 will be inserted into the liquid inlet channel 12, thereby ensuring that when the protruding portion 211 closes the liquid inlet channel 12, the annular flange 23 will simultaneously seal the liquid outlet channel 13 to prevent safety accidents.

In some embodiments, the protruding portion 211 is provided with a pressure stabilizing hole 2111 , the opening of the pressure stabilizing hole 2111 faces the liquid inlet channel 12 , and the pressure stabilizing hole 2111 extends along the central axis of the valve core 2 .

As shown in Figure 1, a pressure stabilizing hole 2111 extending left and right is provided at the central axis of the protrusion 211. The pressure stabilizing hole 2111 opens to the left. When the liquid in the liquid inlet channel 12 flows in, the pressure stabilizing hole 2111 can drain the liquid. The pressure is guided along the central axis of the protrusion 211 to prevent the liquid pressure from deflecting and causing damage to the valve core 2 and the housing 1 .

In some embodiments, the safety valve also includes a pressure regulating plug 4 , the pressure regulating plug 4 is provided in the chamber 11 , the reset member 3 is provided between the valve core 2 and the pressure regulating plug 4 , the pressure regulating plug 4 The axial position of the chamber 11 is adjustable to adjust the reset force of the reset member 3 .

As shown in Figure 1, a pressure regulating plug 4 is also provided at the right end of the chamber 11. A reset piece 3 is provided between the pressure regulating plug 4 and the valve core 2. The pressure regulating plug 4 is a pressure regulating screw plug. The thread fits in the chamber 11, and the pressure regulating screw plug can move left and right in the chamber 11 by rotating. When the pressure regulating screw plug moves to the right, the reset force of the reset member 3 becomes smaller. When the pressure regulating screw plug moves to the left, , the reset force of the reset member 3 becomes larger.

In some embodiments, the safety valve also includes a reset seat 5. The chamber 11 includes a first section 111 and a second section 112. The diameter of the first section 111 is smaller than the diameter of the second section 112. The valve core 2 is guided and fitted in In the first section 111, the reset piece 3 and the reset seat 5 are guided and matched in the second section 112, and the reset seat 5 is located between the valve core 2 and the reset piece 3. The diameter of the reset seat 5 is larger than the diameter of the first section 111. size.

As shown in Figure 1, the left end of the chamber 11 is the first section 111. The valve core 2 is guided and fitted in the first section 111. The right end is the second section 112. The reset member 3 and the reset seat 5 are guided and fitted in the second section 112. Inside, the diameter of the first section 111 is smaller than the diameter of the second section 112 to form a step portion. A reset seat 5 is provided in the chamber 11. The diameter of the reset seat 5 is larger than the diameter of the first section 111. The left end of the reset seat 5 is against It is connected to the step portion to prevent the reset member 3 and the reset seat 5 from moving leftward into the first section 111.

In some embodiments, the reset seat 5 is provided with a first protrusion 51 , the pressure regulating plug 4 is provided with a second protrusion 41 , the return member 3 is a spring, and one end of the return member 3 is sleeved on the first protrusion. 51, the other end of the reset member 3 is sleeved on the outer peripheral side of the second protrusion 41.

As shown in Figure 1, a first protrusion 51 is provided on the right end surface of the reset seat 5, and a second protrusion 41 is provided on the left end surface of the pressure regulating plug 4. The first protrusion 51 and the second protrusion 41 There is a reset piece 3 between them. The reset piece 3 is a spring. The left end of the spring is set on the outer circumferential surface of the first protrusion 51, and the right end of the spring is set on the outer circumferential surface of the second protrusion 41 to ensure that the spring is compressed or There will be no deflection during the stretching process, and it has the characteristics of high safety and simple structure.

In some embodiments, the housing 1 includes a first housing 14 and a second housing 15 that are threadedly connected. The first section 111 of the chamber 11 is formed in the first housing 14 and the second section 112 of the chamber 11 Formed in the second housing 15 , the pressure regulating plug 4 is threadedly assembled in the second housing 15 .

As shown in Figure 1, the housing 1 is divided into a first housing 14 and a second housing 15. The first housing 14 is located at the left end, and the second housing 15 is located at the right end. The first housing 14 and the second housing 15 Through threaded connection, the first section 111 of the chamber 11 is formed in the first housing 14, and the second section 112 of the chamber 11 is formed in the second housing 15. A pressure regulating plug is threadedly connected to the right end of the second housing 15. The head 4 forms the structure of the housing 1 through the first housing 14 and the second housing 15, and has the characteristics of simple disassembly, easy maintenance, and convenient assembly.

In some embodiments, the housing 1 further includes a limiting plug 6 , and the liquid inlet channel 12 is provided in the limiting plug 6 .

As shown in Figure 1, a limit plug 6 is provided at the left end of the housing 1. A through hole is provided in the center of the limit plug 6. The diameter of the through hole is the same as the diameter of the liquid inlet channel 12. The limit plug 6 is The right end surface abuts the left end of the valve seat 16 to prevent the valve seat 16 from moving to the left to prevent the valve core 2 from moving too much to the left when the reset member 5 resets the valve core 2 from the second position to the first position, causing an accident. , improve the safety of the safety valve.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inside", "Outside", "Clockwise", "Counterclockwise", "Axis", The orientations or positional relationships indicated by "radial direction", "circumferential direction", etc. are based on the orientations or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply the referred devices or components. Must have a specific orientation, be constructed and operate in a specific orientation and are therefore not to be construed as limitations of the invention.

In addition, the terms “first” and “second” are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Therefore, features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically limited.

In the present invention, unless otherwise clearly stated and limited, the terms "installation", "connection", "connection", "fixing" and other terms should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. , or integrated; it can be mechanically connected, electrically connected or communicable with each other; it can be directly connected or indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction between two elements, Unless otherwise expressly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

In the present invention, unless otherwise expressly stated and limited, a first feature being "on" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. touch. Furthermore, the terms "above", "above" and "above" the first feature is above the second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "below" and "beneath" the first feature to the second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature has a smaller horizontal height than the second feature.

As used herein, the terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" mean specific features, structures, materials, or features described in connection with the embodiment or example. Features are included in at least one embodiment or example of the invention. In this specification, the schematic expressions of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine different embodiments or examples and features of different embodiments or examples described in this specification unless they are inconsistent with each other.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above-mentioned embodiments are illustrative and should not be construed as limitations of the present invention. Those of ordinary skill in the art can make modifications to the above-mentioned embodiments within the scope of the present invention. The embodiments are subject to changes, modifications, substitutions and variations.

Claims (9)

1. A safety valve, comprising:

the device comprises a shell, wherein a cavity is arranged in the shell, a liquid inlet channel and a liquid outlet channel are arranged on the shell, and the cavity is communicated between the liquid inlet channel and the liquid outlet channel;

a spool provided in the chamber, the spool being adjustable in axial position along the chamber and having a first position in which the spool cuts off the liquid inlet passage and the liquid outlet passage, and a second position in which the liquid inlet passage and the liquid outlet passage communicate, the spool having a first end facing the liquid inlet passage, the first end being provided with a projection for sealing insertion into the liquid inlet passage when the spool is in the first position to achieve separation of the liquid inlet passage and the chamber, a ring groove and an annular flange, at least part of the projection being for sealing insertion into the liquid inlet passage to achieve separation of the liquid inlet passage and the chamber, the annular flange closing the liquid outlet passage in synchronization, an opening of the ring groove facing the liquid inlet passage, and the ring groove surrounding an outer peripheral side of the projection, the annular flange surrounding an outer peripheral side of the projection, the ring groove being formed between the projection and the annular flange, an outer peripheral surface of the annular flange being flush with an outer peripheral surface of the spool and in contact with an inner peripheral surface of the chamber, the annular flange being formed with an opposing peripheral surface of the ring groove;

the reset piece is arranged in the cavity, the reset piece is abutted to the second end of the valve core, and the reset piece is used for resetting the valve core from the second position to the first position.

2. The safety valve according to claim 1, wherein in the first position at least part of the outer peripheral wall of the annular flange seals off the inlet of the liquid outlet channel.

3. The safety valve according to claim 1, wherein a length dimension of the projection along the chamber axial direction is greater than a length dimension of the annular flange along the chamber axial direction.

4. The relief valve of claim 1, wherein a pressure stabilizing hole is provided in the boss, an opening of the pressure stabilizing hole being directed toward the liquid inlet passage, the pressure stabilizing hole extending along a central axis of the valve spool.

5. The safety valve according to claim 1, further comprising a pressure regulating plug disposed in the chamber, the reset member disposed between the valve core and the pressure regulating plug, the axial position of the pressure regulating plug along the chamber being adjustable to effect adjustment of the reset force of the reset member.

6. The safety valve of claim 5, further comprising a reset seat, wherein the chamber comprises a first section and a second section, the first section having a smaller diameter than the second section, the spool guide fits within the first section, the reset member and the reset seat guide fit within the second section, and the reset seat is located between the spool and the reset member, the reset seat having a larger diameter than the first section.

7. The safety valve according to claim 6, wherein the reset seat is provided with a first protrusion, the pressure regulating plug is provided with a second protrusion, the reset element is a spring, one end of the reset element is sleeved on the outer circumferential side of the first protrusion, and the other end of the reset element is sleeved on the outer circumferential side of the second protrusion.

8. The safety valve according to claim 6, wherein the housing comprises a first housing and a second housing threadably connected, a first section of the chamber being formed in the first housing, a second section of the chamber being formed in the second housing, the pressure regulating plug being threadably mounted in the second housing.

9. The safety valve according to any one of claims 1-8, wherein the housing further comprises a stopper plug, the liquid inlet channel being provided within the stopper plug.