Proportional overflow valve capable of limiting maximum pressure

Abstract

The utility model discloses a proportional overflow valve capable of limiting maximum pressure, which relates to the technical field of overflow valves, and comprises a plug, a pin, a valve seat, a hexagonal pan head, a valve sleeve, a valve core, an ejector rod, a high-pressure limiting block and an adjusting screw rod, the pin is arranged on the left side above the plug, a bidirectional transient diode is arranged in the plug, the plug is sleeved on the outer side of a valve body, and the valve sleeve is sleeved on the valve body. An enameled wire is arranged between the plug and the valve body, and a coil framework and a plug check ring are arranged at the left end and the right end of the enameled wire respectively. According to the proportional overflow valve capable of limiting the maximum pressure, the high-pressure limiting block is arranged below the adjusting screw rod, the high-pressure limiting block is used for limiting the maximum adjustable constant pressure, the structural adjustment is more beneficial to improvement of the testing efficiency in the manufacturing and production testing process, and the situation that the device allowable pressure is exceeded due to the fact that the depth of the adjusting screw rod is too large can be effectively prevented; and the pressure sensor is prevented from exceeding the range or being damaged.

Description

Technical Field

[0001] The utility model relates to the technical field of overflow valves, in particular to a proportional overflow valve capable of limiting maximum pressure. Background Art

[0002] The solenoid valve is used in the hydraulic oil pump pressure control environment. The valve is a normally closed high-pressure relief valve with an initial pressure of 300bar / 250bar / 200bar. When the solenoid valve is not energized, the valve port maintains a pressure of 300bar / 250bar / 200bar. When the solenoid valve is energized (proportional control), the overflow port begins to overflow (proportional), and the valve port pressure changes from 300bar to 0bar.

[0003] The proportional relief valve has a variety of maximum set pressure ranges, which can be adjusted at the factory. After leaving the factory, the structure allows users to adjust the performance, but users are prone to misoperation during the adjustment process, such as setting the pressure too high or too low. In particular, when the pressure is set too high, it is easy to cause abnormal performance of the oil pump, or damage other accessories of the oil pump due to excessively high pressure settings.

[0004] In order to avoid the above risk, a proportional relief valve structure capable of limiting the maximum pressure is proposed. Utility Model Content

[0005] The utility model aims to solve the problems in the prior art and provides a proportional relief valve capable of limiting the maximum pressure.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme: a proportional relief valve capable of limiting the maximum pressure, comprising a plug, a pin, a valve seat, a hexagonal disc head, a valve sleeve, a valve core, a push rod, a high-pressure limit block, and an adjusting screw.

[0007] A pin is arranged on the upper left side of the plug, a bidirectional transient diode is installed in the plug, the plug is sleeved on the outside of the valve body, an enameled wire is arranged between the plug and the valve body, and a coil skeleton and a plug retaining ring are arranged at the left and right ends of the enameled wire respectively;

[0008] A plug locking nut is provided on the outer wall of the valve body on the left side of the plug, an O-ring eight is provided at the junction of the plug locking nut, the plug and the valve body, the adjusting screw is inserted into the left end of the valve body of the plug locking nut horizontally, the outer side of the adjusting screw is sleeved with an adjusting screw locking nut, the right side of the adjusting screw locking nut is attached to the left surface of the valve body, a polytetrafluoroethylene retaining ring five is provided at the junction of the adjusting screw locking nut, the adjusting screw and the valve body, a rear choke is provided on the outer side of the adjusting screw inside the valve body, a polytetrafluoroethylene retaining ring four and an O-ring seven are sequentially sleeved between the adjusting screw and the rear choke, the right end of the adjusting screw is pressed against the left end of the second spring, a high-pressure limit block is provided on the outer side of the left end of the second spring, the left end of the high-pressure limit block is attached to the right end of the adjusting screw, and the high-pressure limit block is sleeved between the second spring and the rear choke;

[0009] An armature is installed on the right side of the rear choke, a guide tube 1 is installed on the outside of the armature, a guide tube 2 is installed on the left side of the guide tube 1, the guide tube 2 is installed on the outside of the rear choke, and an O-ring 6 is arranged between the guide tube 2 and the rear choke;

[0010] The hexagonal pan head is sleeved on the outer side of the right end of the valve body, a valve seat is sleeved inside the right end of the hexagonal pan head, an O-ring three and a polytetrafluoroethylene retaining ring one are sleeved between the valve seat and the hexagonal pan head from inside to outside, and a valve sleeve is sleeved on the outer side of the right end of the valve seat;

[0011] The valve core passes through the valve seat, a push rod is installed on the left side of the valve core, and a spring is sleeved on the right end of the push rod and the outer side of the left end of the valve core.

[0012] Furthermore, a valve port is arranged at the right end of the valve sleeve, and an overflow port is arranged upwardly in the middle of the valve sleeve.

[0013] Furthermore, the mid-lines of the adjusting screw, the second spring, the push rod and the valve core are on the same horizontal line.

[0014] Furthermore, an O-ring 2 is installed at the position where the inner side of the left end of the hexagonal pan head contacts the valve body, and a polytetrafluoroethylene retaining ring 3 and an O-ring 5 are sequentially sleeved on the outer side of the hexagonal pan head from right to left.

[0015] Furthermore, a retaining spring is installed between the valve sleeve and the hexagonal pan head, and an O-ring 4 and a polytetrafluoroethylene retaining ring 2 are sequentially sleeved on the outer side of the right end of the valve sleeve from the inside to the outside.

[0016] Furthermore, a throttling screw plug is installed above the armature, a front choke is installed on the right side of the armature, and an O-ring 1 is installed between the front choke and the conduit 1.

[0017] Compared with the prior art, the advantages and positive effects of the utility model are:

[0018] 1. A high-pressure limit block is set below the adjusting screw. The high-pressure limit block is used to limit the maximum adjustable pressure. For example, a high-pressure limit block with a thickness of 5 mm is set in a proportional relief valve with an initial pressure of 300 bar, and a limit block with a thickness of 4.5 mm is set in a proportional relief valve with a pressure of 250 bar. If the user sets the pressure to 300-320 bar during the debugging process, the adjusting screw will be cut off at the high-pressure limit block position, and no higher pressure adjustment can be made.

[0019] 2. This structural adjustment is also more conducive to improving the test efficiency during the manufacturing and production testing process, and can effectively prevent the risk of exceeding the allowable pressure of the equipment due to the adjustment screw depth being too deep, thereby causing the pressure sensor to exceed the range or be damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the utility model;

[0021] Figure 2 for Figure 1 A schematic diagram of the enlarged structure of the middle A area;

[0022] Figure 3 It is a schematic diagram of the structure of the existing proportional relief valve mentioned in the background technology.

[0023] Legend: 1. Plug, 2. Pin, 3. Bidirectional transient diode, 4. Plug retaining ring, 5. Enameled wire, 6. Conduit 1, 7. O-ring 1, 8. O-ring 2, 9. O-ring 3, 10. Valve seat, 11. PTFE retaining ring 1, 12. Hexagonal pan head, 13. Circlip, 14. O-ring 4, 15. Valve sleeve, 16. PTFE retaining ring 2, 17. Valve core, 18. PTFE retaining ring 3, 19. O-ring 5, 20. Spring 1, 2 1. Front choke, 22. Push rod, 23. Armature, 24. Conduit 2, 25. O-ring 6, 26. Spring 2, 27. High-pressure limit block, 28. Polytetrafluoroethylene retaining ring 4, 29. O-ring 7, 30. Rear choke, 31. Adjusting screw, 32. Adjusting screw locking nut, 33. Polytetrafluoroethylene retaining ring 5, 34. Plug locking nut, 35. O-ring 8, 36. Coil skeleton, 37. Throttle plug, 38. Valve port, 39. Overflow port. DETAILED DESCRIPTION

[0024] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0025] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0026] like Figure 1-2 As shown, the utility model provides a proportional relief valve capable of limiting the maximum pressure, comprising a plug 1, a pin 2, a bidirectional transient diode 3, a plug retaining ring 4, an enameled wire 5, a conduit 1 6, an O-ring 1 7, an O-ring 2 8, an O-ring 3 9, a valve seat 10, a polytetrafluoroethylene retaining ring 1 11, a hexagonal pan head 12, a retaining spring 13, an O-ring 4 14, a valve sleeve 15, a polytetrafluoroethylene retaining ring 2 16, a valve core 17, a polytetrafluoroethylene retaining ring 3 18, an O-ring Ring five 19, spring one 20, front choke 21, push rod 22, armature 23, conduit two 24, O-ring six 25, spring two 26, high-pressure limit block 27, polytetrafluoroethylene retaining ring four 28, O-ring seven 29, rear choke 30, adjusting screw 31, adjusting screw locking nut 32, polytetrafluoroethylene retaining ring five 33, plug locking nut 34, O-ring eight 35, coil skeleton 36, throttling screw plug 37, valve port 38, overflow port 39,

[0027] A pin 2 is arranged on the upper left side of the plug 1, a bidirectional transient diode 3 is installed in the plug 1, the plug 1 is sleeved on the outside of the valve body, an enameled wire 5 is arranged between the plug 1 and the valve body, and a coil skeleton 36 and a plug retaining ring 4 are arranged at the left and right ends of the enameled wire 5 respectively;

[0028] A plug locking nut 34 is provided on the outer wall of the valve body on the left side of the plug 1, and an O-ring eight 35 is provided at the junction of the plug locking nut 34, the plug 1 and the valve body, the left valve body end of the plug locking nut 34 is laterally inserted into the adjusting screw 31, the outer side of the adjusting screw 31 is sleeved with an adjusting screw locking nut 32, the right side of the adjusting screw locking nut 32 is attached to the left surface of the valve body, and a polytetrafluoroethylene retaining ring five 33 is provided at the junction of the adjusting screw locking nut 32, the adjusting screw 31 and the valve body, and a rear choke 30 is provided on the outer side of the adjusting screw 31 inside the valve body, and a polytetrafluoroethylene retaining ring four 28 and an O-ring seven 29 are sequentially sleeved between the adjusting screw 31 and the rear choke 30, and the right end of the adjusting screw 31 The left end of the second spring 26 is pressed against the left end of the second spring 26. A high-pressure limit block 27 is arranged outside the left end of the second spring 26. The left end of the high-pressure limit block 27 is in contact with the right end of the adjusting screw 31. The high-pressure limit block 27 is sleeved between the second spring 26 and the rear choke 30. The high-pressure limit block is used to limit the maximum adjustable pressure. For example, a high-pressure limit block with a thickness of 5 mm is arranged in a proportional relief valve with an initial pressure of 300 bar, and a limit block with a thickness of 4.5 mm is arranged in a proportional relief valve with a pressure of 250 bar. When the user adjusts the pressure to 300b-320 bar during the debugging process, the adjusting screw will be cut off at the position of the high-pressure limit block, and no higher pressure adjustment can be made.

[0029] An armature 23 is installed on the right side of the rear choke 30, a guide tube 16 is installed on the outside of the armature 23, a guide tube 24 is installed on the left side of the guide tube 16, the guide tube 24 is installed on the outside of the rear choke 30, an O-ring 6 25 is arranged between the guide tube 24 and the rear choke 30, a throttling screw 37 is installed above the armature 23, a front choke 21 is installed on the right side of the armature 23, and an O-ring 17 is installed between the front choke 21 and the guide tube 16;

[0030] The hexagonal pan head 12 is sleeved on the right outer side of the valve body, the left inner side of the hexagonal pan head 12 is installed with an O-ring 28 at the contact part with the valve body, the outer side of the hexagonal pan head 12 is sleeved with a polytetrafluoroethylene retaining ring 3 18 and an O-ring 5 19 in sequence from right to left, the right end of the hexagonal pan head 12 is sleeved with a valve seat 10, the valve seat 10 and the hexagonal pan head 12 are sleeved with an O-ring 3 9 and a polytetrafluoroethylene retaining ring 11 in sequence from inside to outside, the right outer side of the valve seat 10 is sleeved with a valve sleeve 15, a retaining ring 13 is installed between the valve sleeve 15 and the hexagonal pan head 12, and the right outer side of the valve sleeve 15 is sleeved with an O-ring 4 14 and a polytetrafluoroethylene retaining ring 2 16 in sequence from inside to outside;

[0031] The valve core 17 passes through the valve seat 10, a push rod 22 is installed on the left side of the valve core 17, and a spring 20 is sleeved on the right end of the push rod 22 and the outer side of the left end of the valve core 17;

[0032] The mid-line of the adjusting screw 31, the spring 26, the push rod 22 and the valve core 17 are on the same horizontal line;

[0033] A valve port 38 is provided at the right end of the valve sleeve 15 , and an overflow port 39 is provided upwardly in the middle of the valve sleeve 15 .

[0034] The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in other forms. Any technician familiar with the profession may use the technical contents disclosed above to change or modify them into equivalent embodiments with equivalent changes and apply them to other fields. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A proportional relief valve capable of limiting maximum pressure, comprising a plug (1), a pin (2), a valve seat (10), a hexagonal disc head (12), a valve sleeve (15), a valve core (17), a push rod (22), a high-pressure limit block (27), and an adjusting screw (31), characterized in that: A plug pin (2) is arranged on the upper left side of the plug (1), a bidirectional transient diode (3) is installed in the plug (1), the plug (1) is sleeved on the outside of the valve body, an enameled wire (5) is arranged between the plug (1) and the valve body, and a coil skeleton (36) and a plug retaining ring (4) are arranged at the left and right ends of the enameled wire (5), respectively; A plug locking nut (34) is arranged on the outer wall of the valve body on the left side of the plug (1), and an O-ring eight (35) is arranged at the junction of the plug locking nut (34), the plug (1) and the valve body. The left end of the valve body of the plug locking nut (34) is laterally inserted into the adjusting screw (31), and the outer side of the adjusting screw (31) is sleeved with an adjusting screw locking nut (32). The right side of the adjusting screw locking nut (32) is attached to the left side surface of the valve body, and a polytetrafluoroethylene retaining ring is arranged at the junction of the adjusting screw locking nut (32), the adjusting screw (31) and the valve body. Five (33), a rear choke (30) is arranged on the outer side of the adjusting screw (31) inside the valve body, a polytetrafluoroethylene retaining ring (28) and an O-ring (29) are sequentially sleeved between the adjusting screw (31) and the rear choke (30), the right end of the adjusting screw (31) is pressed against the left end of the second spring (26), a high-pressure limit block (27) is arranged on the outer side of the left end of the second spring (26), the left end of the high-pressure limit block (27) is in contact with the right end of the adjusting screw (31), and the high-pressure limit block (27) is sleeved between the second spring (26) and the rear choke (30); An armature (23) is installed on the right side of the rear choke (30), a guide tube (6) is installed on the outside of the armature (23), a guide tube (24) is installed on the left side of the guide tube (6), the guide tube (24) is installed on the outside of the rear choke (30), and an O-ring (25) is provided between the guide tube (24) and the rear choke (30); The hexagonal pan head (12) is sleeved on the outer side of the right end of the valve body, and the valve seat (10) is sleeved inside the right end of the hexagonal pan head (12). An O-ring three (9) and a polytetrafluoroethylene retaining ring one (11) are sleeved between the valve seat (10) and the hexagonal pan head (12) from the inside to the outside, and a valve sleeve (15) is sleeved on the outer side of the right end of the valve seat (10); The valve seat (10) passes through a valve core (17), a push rod (22) is installed on the left side of the valve core (17), and a spring (20) is sleeved on the right end of the push rod (22) and the outer side of the left end of the valve core (17).

2. A proportional relief valve capable of limiting maximum pressure according to claim 1, characterized in that: The right end of the valve sleeve (15) is provided with a valve port (38), and the middle part of the valve sleeve (15) is provided with an overflow port (39) facing upwards.

3. A proportional relief valve capable of limiting maximum pressure according to claim 1, characterized in that: The mid-points of the adjusting screw rod (31), the second spring (26), the push rod (22) and the valve core (17) are on the same horizontal line.

4. A proportional relief valve capable of limiting maximum pressure according to claim 1, characterized in that: An O-ring 2 (8) is installed at the inner side of the left end of the hexagonal pan head (12) in contact with the valve body, and a polytetrafluoroethylene retaining ring 3 (18) and an O-ring 5 (19) are sequentially sleeved on the outer side of the hexagonal pan head (12) from right to left.

5. A proportional relief valve capable of limiting maximum pressure according to claim 1, characterized in that: A retaining ring (13) is installed between the valve sleeve (15) and the hexagonal pan head (12), and an O-ring 4 (14) and a polytetrafluoroethylene retaining ring 2 (16) are sequentially sleeved on the outer side of the right end of the valve sleeve (15) from the inside to the outside.

6. A proportional relief valve capable of limiting maximum pressure according to claim 1, characterized in that: A throttling screw plug (37) is installed above the armature (23), a front choke (21) is installed on the right side of the armature (23), and an O-ring (7) is installed between the front choke (21) and the conduit (6).

Images