Automatic reset valve

By designing the structure of the guide sealing unit and the spring-driven sealing plug in the automatic reset valve, a rapid test of the performance of the high-level control valve is achieved, and the problem of insufficient function of the automatic reset valve in the prior art is solved, and the oil filling operation is improved Safety and ease of inspection.

CN112780796BActive Publication Date: 2024-12-17SHANGHAI QIYU ELECTROMECHANICAL EQUIP CO LTD +1
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Patent Information

Application Number
CN202110007177.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2021-01-05
Publication Date
2024-12-17
Estimated Expiration
2041-01-05

AI Technical Summary

Technical Problem

In the prior art, the automatic reset valve cannot quickly and effectively test the performance of the high-level control valve, resulting in safety hazards and inconvenient inspection of oil filling operations.

Method used

An automatic reset valve is designed, with air intake holes, working air holes and step holes on the valve body, and a built-in guide sealing unit, which automatically opens or closes the air holes with a spring-driven sealing plug to realize the automatic reset and judgment function of the air flow path.

Benefits of technology

By pulling and loosening the handle, determine whether there is air in the air inlet hole, quickly judge the performance of the high-level control valve, and ensure the safety and convenience of oil filling operations.

✦ Generated by Eureka AI based on patent content.

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    Figure CN112780796B_ABST
Patent Text Reader

Abstract

The object of the present invention is to provide an automatic reset valve which can quickly test the performance of a high liquid level control valve. When there is gas in the air inlet, the pull rod is pulled to drive the sealing plug to move to open the air inlet and close the air exhaust. The gas enters the valve cavity from the valve mouth. The pressure exerted by the air pressure in the valve cavity on the sealing plug is greater than the elastic force of the spring. Therefore, the sealing plug can be pressed against the sealing surface of the air exhaust and the air exhaust is closed. At this time, the air inlet and the working air hole constitute an air flow passage. When the air pressure in the valve cavity gradually weakens or disappears, the pressure exerted by the air pressure in the valve cavity on the sealing plug is less than the elastic force of the spring. The elastic force of the spring drives the sealing plug to close the air inlet. When there is no air in the air inlet or the air pressure is relatively low, the sealing plug closes the air inlet under the elastic force of the spring. At this time, even if the pull rod is manually pulled, when the hand releases the pull rod, the sealing plug will still move and automatically close the air inlet due to the elastic force of the spring, thereby realizing the function of automatic reset and closing.
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Description

Technical Field

[0001] The invention relates to the technical field of tank fueling vehicles, and in particular to an automatic reset valve. Background Art

[0002] Tank trucks are a common type of refueling and oil transportation equipment. The principle is as follows: when external equipment is filling the tank with oil, in order to prevent the potential safety hazard caused by excessive oil overflow, a high-level valve is installed on the top of the tank to directly control the switch of the oil filling bottom valve. The control level performance of the high-level valve not only determines whether the oil filling operation can run normally, but also affects the safety of the oil filling operation. Therefore, it is necessary to regularly check the function of the high-level valve. For safety reasons, it is hoped that the oil tank does not need to be filled with oil for inspection and testing.

[0003] In the test gas circuit, an automatic reset valve is installed on the pipeline between the working port A of the high liquid level control valve with test function and the oil bottom valve. The air intake of the oil bottom valve is controlled by the automatic reset valve. When the gas enters the test port Z, if the handle cannot be pulled, it means that there is no air in the air inlet of the automatic reset valve, that is, the performance of the high liquid level test control valve is normal; if the handle can be pulled, it means that there is air in the air inlet of the automatic reset valve, that is, the performance of the high liquid level test control valve fails. However, how the automatic reset valve can achieve the above functions is a difficult problem that needs to be solved in the industry. Summary of the invention

[0004] The purpose of the present invention is to provide an automatic reset valve capable of quickly testing the performance of a high liquid level control valve.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: an automatic reset valve, the valve body is provided with an air inlet hole, a working air hole and a step hole connected with the valve cavity, a guide sealing unit is arranged in the step hole, the guide sealing unit includes a sealing plug arranged in the valve cavity, one end of the pull rod is connected with the sealing plug, and the other end protrudes to the outside of the valve body, a spring is sleeved on the pull rod, and an exhaust hole connected with the valve cavity is also provided on the guide sealing unit, when the valve port between the air inlet hole and the valve cavity abuts against the sealing plug, the spring overcomes the air pressure on the sealing surface at the valve port and provides elastic force to drive the sealing plug to close the air inlet hole; when there is air in the air inlet hole, the sealing plug is manually driven to move to open the air inlet hole and close the exhaust hole, the air pressure acting on the sealing plug overcomes the elastic force of the spring and enables the sealing plug to keep the exhaust hole in a closed state; when there is no air in the air inlet hole or the air pressure is low, the spring drives the sealing plug to move and automatically close the air inlet hole.

[0006] In the above scheme, when there is air in the air inlet, the pull rod is pulled to drive the sealing plug to move to open the air inlet and close the exhaust hole, and the gas enters the valve cavity from the valve mouth. The pressure exerted on the sealing plug by the air pressure in the valve cavity is greater than the elastic force of the spring, so the sealing plug can be pressed against the sealing surface of the exhaust hole and close the exhaust hole. At this time, the air inlet and the working air hole constitute an air flow passage; when the air pressure in the valve cavity gradually weakens or disappears, the pressure exerted on the sealing plug by the air pressure in the valve cavity is less than the elastic force of the spring, and the elastic force of the spring drives the sealing plug to close the air inlet; when there is no air in the air inlet or the air pressure is relatively low, the sealing plug closes the air inlet under the action of the elastic force of the spring. At this time, even if the pull rod is manually pulled, when the hand releases the pull rod, the sealing plug will still move and automatically close the air inlet due to the elastic force of the spring, thereby realizing the function of automatic reset and closing. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is the front view of the automatic reset valve;

[0008] Figure 2 for Figure 1 Left view of

[0009] Figure 3 It is a cross-sectional view of the automatic reset valve in a closed state;

[0010] Figure 4 for Figure 3 GG cross-sectional view;

[0011] Figure 5 It is a cross-sectional view of the automatic reset valve in the open state;

[0012] Figure 6 for Figure 5 HH cross-sectional view;

[0013] Figure 7 is a three-dimensional diagram of the valve body;

[0014] Figure 8 is a cross-sectional view of the valve body;

[0015] Fig. 9 is a cross-sectional view of a guide seal unit;

[0016] Fig.10 for Figure 4 A partially enlarged schematic diagram of

[0017] Fig.11 for Figure 6 A partially enlarged schematic diagram of

[0018] Fig.12 It is the structural diagram of the sealing plug and the tie rod;

[0019] Fig.13 for Fig.12Parts drawing;

[0020] Fig.14 It is a structural schematic diagram of the sealing seat and the guide sleeve;

[0021] Fig.15 Schematic diagram of the structure of the guide sleeve;

[0022] Fig.16 It is a structural schematic diagram of the sealing seat. DETAILED DESCRIPTION

[0023] Combine the following Figure 1-Figure 16 The present invention is described in further detail.

[0024] like Figure 1-Figure 6 As shown, an automatic reset valve is provided on a valve body 10 with an air inlet 12, a working air hole 13 and a step hole 14 communicating with a valve cavity 11, a guide sealing unit 20 is provided in the step hole 14, and the guide sealing unit 20 includes a sealing plug 21 arranged in the valve cavity 11, one end of a pull rod 22 is connected to the sealing plug 21, and the other end protrudes to the outside of the valve body 10, a spring 23 is sleeved on the pull rod 22, and an exhaust hole 26 communicating with the valve cavity 11 is also provided on the guide sealing unit 20, the air inlet 12 and the valve cavity 11 are connected to each other. When the valve port A between the two contacts is against the sealing plug 21, the spring 23 overcomes the air pressure on the sealing surface at the valve port A and provides elastic force to drive the sealing plug 21 to close the air inlet hole 12; when there is air in the air inlet hole 12, the sealing plug 21 is manually driven to move to open the air inlet hole 12 and close the exhaust hole 26, and the air pressure acting on the sealing plug 21 overcomes the elastic force of the spring 23 and enables the sealing plug 21 to keep the exhaust hole 26 in a closed state; when there is no air in the air inlet hole 12 or the air pressure is low, the spring 23 drives the sealing plug 21 to move and automatically close the air inlet hole 12.

[0025] In the above structure, when there is gas in the air inlet 12, the pull rod 22 is pulled to drive the sealing plug 21 to move and open the air inlet 12 and close the exhaust hole 26, and the gas enters the valve cavity 11 from the valve port A. The pressure of the air pressure in the valve cavity 11 on the sealing plug 21 is greater than the elastic force of the spring 23, so the sealing plug 21 can be pressed against the sealing surface of the exhaust hole 26 and the exhaust hole 26 is closed. At this time, the air inlet 12 and the working air hole 13 form an air flow path; when the air pressure in the valve cavity 11 gradually weakens or disappears, the air pressure in the valve cavity 11 acts on the sealing plug 2 1 is less than the elastic force of the spring, and the elastic force of the spring drives the sealing plug 21 to close the air inlet 12. At this time, the working air hole 13 and the exhaust hole 26 form an air flow path, and the gas is discharged from the exhaust hole 26; when the air inlet 12 is airless or has a low air pressure, the sealing plug 21 closes the air inlet under the elastic force of the spring 23. At this time, even if the pull rod 22 is manually pulled, when the hand releases the pull rod 22, the sealing plug 21 will still move and automatically close the air inlet 12 due to the elastic force of the spring 23, thereby realizing the function of automatic reset and closure. At the same time, according to whether the handle 22 can be pulled, it can be intuitively judged whether the air inlet 12 has air or not, so that it can be used in the high liquid level test gas circuit system to judge the performance of the high liquid level control valve with test function.

[0026] In order to achieve the above functions, the sealing plug 21 is cylindrical as a whole, and the first sealing surface B at the valve port A matched with the sealing plug 21 is arc-shaped. The area of ​​the second sealing surface C on the side of the sealing plug 21 adjacent to the first sealing surface B is larger than that of the first sealing surface B, and an inclined surface D is provided at the outer ring position of the second sealing surface C. When the spring 23 drives the second sealing surface C of the sealing plug 21 to press the first sealing surface B, due to the arc-shaped structure of the first sealing surface B, the second sealing surface C and the first sealing surface B form a line contact match, and the sealing effect is good; when the pull rod 22 is pulled to drive the sealing plug 21 to move to open the air inlet 12 and close the exhaust hole 26, the gas enters the valve cavity 11 from the valve port A. Since the second sealing surface C has a large area and is subjected to a large force, it can overcome the elastic force of the spring 23 and keep the exhaust hole 26 in a closed state.

[0027] The specific structure is as follows Figure 14-16As shown, the step hole 14 is sequentially arranged with a sealing seat 25 and a guide sleeve 24 which are inlaid and matched from the inside to the outside. The inner diameter of the guide sleeve 24 is smaller than the inner diameter of the sealing seat 25. The pull rod 22 passes through the holes opened in the middle of the sealing seat 25 and the guide sleeve 24. The outer wall of the sealing seat 25 is sealed with the inner wall of the step hole 14. The guide sleeve 24 is provided with an exhaust channel E. The spring chamber between the inner wall of the sealing seat 25 and the pull rod 22 and the exhaust channel E together constitute an exhaust hole 26. When the valve port A is closed, the exhaust hole 26 is communicated with the valve cavity 11. When the valve port A is opened, the exhaust hole 26 is separated from the valve cavity 11. The guide sleeve 24 is provided to ensure the stability of the pull rod 22 during movement. Since the inner diameter of the guide sleeve 24 is smaller than the inner diameter of the sealing seat 25, the spring chamber also constitutes a part of the exhaust gas path. When the air pressure in the valve chamber 11 gradually weakens or disappears, the pressure of the air pressure in the valve chamber 11 acting on the sealing plug 21 is less than the elastic force of the spring 23. The elastic force of the spring 23 drives the sealing plug 21 to close the air inlet 12. At this time, the working air hole 13 and the exhaust hole 26 constitute an air flow path, and the gas in the valve chamber 11 is discharged from the valve body 10 through the exhaust hole 26 formed by the spring chamber and the exhaust channel E.

[0028] When the automatic reset valve is working normally, it is necessary to prevent gas from being discharged from the exhaust hole 26 to the outside of the valve body 10. The third sealing surface F of the sealing seat 25 at one end adjacent to the sealing plug 21 is an inclined surface recessed toward the inner circle, and the middle part of the inclined surface is inclined toward the outer circle and is provided with a guide chamfer. A step is provided on the outer wall of the sealing seat 25 adjacent to the third sealing surface F, and a sealing ring 27 is sleeved on the step, and the sealing ring 27 is sealed against the inner wall of the step hole 14. During assembly, the sealing ring 27 is first installed into the step hole 14. After the other components of the guide sealing unit 20 are assembled outside the valve body, they are installed as a whole into the step hole 14. Therefore, the guide chamfer of the sealing seat 25 is convenient for passing the sealing ring 27, and then the sealing ring 27 is abutted against the inner wall of the through hole 14 for sealing. When the valve port A is opened, the end face of the sealing plug 21 abuts against the third sealing surface F. Since the third sealing surface F is an inclined surface recessed toward the inner circle, the end face of the sealing plug 21 and the third sealing surface F form a line contact fit, with a good sealing effect, which effectively prevents the gas in the valve cavity 11 from being discharged from the exhaust hole 26.

[0029] like Figure 11-13 As shown, the sealing plug 21 is provided with a multi-stepped hole 211 along the axial direction, and the multi-stepped rod body of the pull rod 22 is placed in the multi-stepped hole 211 to form an axial limit and a circumferential limit fit, and the outer circle of the end surface where the sealing plug 21 and the sealing seat 25 are in contact is set to form an acute angle. It is very important to set the outer circle of the end surface where the sealing plug 21 and the sealing seat 25 are in contact to form an acute angle, because the setting of the acute angle allows a very small air pressure in the valve cavity 11 to achieve the purpose of sealing the sealing plug 21 and the third sealing surface F of the sealing seat 25, otherwise a larger air pressure needs to be introduced into the valve cavity 11 to seal.

[0030] The spring 23 is sleeved on the rod body of the pull rod 22 located in the sealing seat 25, one end of the spring 23 abuts against the end face of the sealing plug 21, and the other end abuts against the end face of the guide sleeve 24, the inner diameter of the guide sleeve 24 is consistent with the outer diameter of the pull rod 22, the exhaust channel E is opened on the inner wall of the guide sleeve 24, and the length direction of the exhaust channel E is consistent with the length direction of the guide sleeve 24.

[0031] In order to increase the exhaust speed, four exhaust channels E are evenly and spaced apart in the circumferential direction of the guide sleeve 24, and the whole is in a cross shape. The gas can be discharged evenly and quickly from the four exhaust channels E, ensuring the timely response of the automatic reset valve; the outer wall of the guide sleeve 24 is provided with an annular groove 241, and the two legs of the U-shaped clamp 242 pass through the two holes provided on the valve body 10 and are clamped in the annular groove 241 to limit the axial position of the guide sleeve 24.

[0032] Since the sealing plug 21 is made of rubber material, a certain amount of deformation is inevitable. Although the multi-step rod body of the pull rod 22 is placed in the multi-step hole 211, the multi-step rod body of the pull rod 22 may shift from the multi-step hole 211 or even fall off during the pulling process. Therefore, a reinforcement hole 221 is provided on the rod body of the pull rod 22 located in the multi-step hole 211. The reinforcement hole 221 cooperates with the reinforcement protrusion 212 provided on the sealing plug 21 to limit the positions of the two. The end of the pull rod 22 protruding to the outside of the valve body 10 is threadedly connected with a handle 222. The pull rod 22 is also provided with a nut 223 for limiting the position of the handle 222. The reinforcement hole 221 is a countersunk hole, including a large-diameter hole adjacent to the outer circle of the pull rod 22 and a small-diameter hole adjacent to the inner circle. The large-diameter hole and the small-diameter hole are transitioned by a reducing hole.

[0033] like Figure 7 As shown, both ends of the air inlet hole 12 on the valve body 10 are open, so a sealing block 30 is provided on each side of the valve body 10, one of the sealing blocks 30 is communicated with the air inlet hole 12, and an air inlet connector 31 is provided on the sealing block 30, and the other sealing block 30 is sealed and connected with the air inlet hole 12 to prevent gas from being discharged from the air inlet hole 12 on this side.

[0034] The valve body 10 is provided with a pressure indicator interface 15 which is in communication with the valve cavity 11. A pressure indicator can be connected to the pressure indicator interface 15, or the pressure indicator interface 15 can be sealed. The arrangement is based on specific needs. The valve body 10 is also provided with a connecting hole 16 for connecting to a foundation, which is used to fix the entire automatic reset valve on the foundation.

Claims

1. An automatic reset valve, wherein a valve body (10) is provided with an air inlet hole (12) communicating with a valve cavity (11), a working air hole (13) and a step hole (14), Features: A guide sealing unit (20) is arranged in the stepped hole (14), and the guide sealing unit (20) includes a sealing plug (21) arranged in the valve cavity (11). One end of a pull rod (22) is connected to the sealing plug (21), and the other end protrudes to the outside of the valve body (10). A spring (23) is sleeved on the pull rod (22). The guide sealing unit (20) is also provided with an exhaust hole (26) communicating with the valve cavity (11). When the valve port (A) between the air inlet hole (12) and the valve cavity (11) abuts against the sealing plug (21), the spring (23) The air pressure on the sealing surface at the valve port (A) is overcome and an elastic force is provided to drive the sealing plug (21) to close the air inlet hole (12); when there is air in the air inlet hole (12), the sealing plug (21) is manually driven to move to open the air inlet hole (12) and close the exhaust hole (26), and the air pressure acting on the sealing plug (21) overcomes the elastic force of the spring (23) and enables the sealing plug (21) to keep the exhaust hole (26) in a closed state; when there is no air in the air inlet hole (12) or the air pressure is relatively low, the spring (23) drives the sealing plug (21) to move and automatically close the air inlet hole (12).

2. The automatic reset valve according to claim 1, Features: The sealing plug (21) is cylindrical in shape as a whole, and the first sealing surface (B) at the valve port (A) matched with the sealing plug (21) is arc-shaped. The area of ​​the second sealing surface (C) on the sealing plug (21) adjacent to the first sealing surface (B) is larger than the area of ​​the first sealing surface (B), and an inclined surface (D) is provided at the outer circle position of the second sealing surface (C).

3. The automatic reset valve according to claim 1, Features: The step hole (14) is sequentially arranged with a sealing seat (25) and a guide sleeve (24) from the inside to the outside. The inner diameter of the guide sleeve (24) is smaller than the inner diameter of the sealing seat (25). The pull rod (22) passes through the holes opened in the middle of the sealing seat (25) and the guide sleeve (24). The outer wall of the sealing seat (25) is sealed with the inner wall of the step hole (14). The guide sleeve (24) is provided with an exhaust channel (E). The spring chamber between the inner wall of the sealing seat (25) and the pull rod (22) and the exhaust channel (E) together constitute an exhaust hole (26). When the valve port (A) is closed, the exhaust hole (26) is communicated with the valve cavity (11). When the valve port (A) is opened, the working air hole (13) is communicated with the air inlet hole (12), and the exhaust hole (26) is isolated from the valve cavity (11).

4. The automatic reset valve according to claim 3, Features: One end of the sealing seat (25) adjacent to the sealing plug (21) is a third sealing surface (F), the third sealing surface (F) is an inclined surface recessed toward the inner circle, the middle part of the inclined surface is inclined toward the outer circle and is provided with a guide chamfer, a step is provided on the outer wall of the sealing seat (25) adjacent to the third sealing surface (F), a sealing ring (27) is sleeved on the step, and the sealing ring (27) is abutted against the inner wall of the step hole (14) for sealing.

5. The automatic reset valve according to claim 4, Features: The sealing plug (21) is provided with a multi-stepped hole (211) along the axial direction, and the multi-stepped rod body of the pull rod (22) is placed in the multi-stepped hole (211) to form an axial limit and a circumferential limit fit, and the outer circle of the end surface where the sealing plug (21) and the sealing seat (25) are in contact is set to form an acute angle.

6. The automatic reset valve according to claim 3, Features: The spring (23) is sleeved on the rod body of the pull rod (22) located in the sealing seat (25), one end of the spring (23) abuts against the end surface of the sealing plug (21), and the other end abuts against the end surface of the guide sleeve (24), the inner diameter of the guide sleeve (24) is consistent with the outer diameter of the pull rod (22), the exhaust channel (E) is opened on the inner wall of the guide sleeve (24), and the length direction of the exhaust channel (E) is consistent with the length direction of the guide sleeve (24).

7. The automatic reset valve according to claim 6, Features: Four exhaust passages (E) are evenly spaced in the circumferential direction of the guide sleeve (24) and are in a cross shape as a whole. An annular groove (241) is provided on the outer wall of the guide sleeve (24). Two legs of a U-shaped clamp (242) pass through two holes provided on the valve body (10) and are clamped in the annular groove (241) to limit the axial position of the guide sleeve (24).

8. The automatic reset valve according to claim 5, Features: A reinforcement hole (221) is provided on the rod body of the pull rod (22) located in the multi-step stepped hole (211). The reinforcement hole (221) cooperates with the reinforcement protrusion (212) provided on the sealing plug (21) to limit the positions of the two. The end of the pull rod (22) protruding to the outside of the valve body (10) is threadedly connected with a handle (222). The pull rod (22) is also provided with a nut (223) for limiting the position of the handle (222). The reinforcement hole (221) is a countersunk hole, including a large diameter hole adjacent to the outer ring of the pull rod (22) and a small diameter hole adjacent to the inner ring, and the large diameter hole and the small diameter hole are transitioned by a variable diameter hole.

9. The automatic reset valve according to claim 1, Features: A sealing block (30) is provided on each side of the valve body (10), one of the sealing blocks (30) is in communication with the air inlet hole (12), an air inlet joint (31) is provided on the sealing block (30), and the other sealing block (30) is sealedly connected to the air inlet hole (12).

10. The automatic reset valve according to claim 9, Features: The valve body (10) is provided with a pressure indicator interface (15) communicating with the valve cavity (11), and the valve body (10) is also provided with a connection hole (16) for connecting with a foundation.