Air tightness detection device for pressure reducing valve

Abstract

The utility model discloses a pressure reducing valve air tightness detection device in the pressure reducing valve detection technology field, comprising a rack, a top plate is slidably arranged on the rack, positioning rings are arranged on the rack and the top plate, the two positioning rings are respectively inserted and matched with an inlet and an outlet of a pressure reducing valve, a sealing member is arranged on the positioning rings, and the sealing member is provided with a pressure reducing valve. A through hole and a cavity which are communicated and form a step-shaped structure are formed in the top plate, a piston rod is arranged in the cavity in a sliding mode, a pressing plate is arranged at the free end of the piston rod, whether the pressure reducing valve leaks air or not can be judged through the sliding stroke of the piston rod, meanwhile, misjudgment of a detection result can be avoided, and therefore the pressure reducing valve is more practical.

Description

Technical Field

[0001] This utility model relates to the field of pressure reducing valve testing technology, specifically a pressure reducing valve airtightness testing device. Background Technology

[0002] A pressure reducing valve is a valve that reduces the inlet pressure to a desired outlet pressure by adjusting the pressure and relies on the energy of the medium itself to automatically maintain a stable outlet pressure. During the production process, pressure reducing valves may leak due to problems such as production, assembly processes, or component quality. Therefore, it is necessary to perform leak detection on pressure reducing valves.

[0003] Existing patent CN21548370U discloses a marine pressure reducing valve testing device. The device fixes the pressure reducing valve body with a mounting base. The fixing method is simple; the pressure reducing valve body is directly inserted into the groove inside the mounting base from top to bottom. After fixing, the two testing tubes are connected to the output and input ends of the pressure reducing valve body through docking seats. Testing can then begin using a testing pump. The operator only needs to observe whether the values ​​of the front and rear pressure gauges match those of the pressure gauges on the pressure reducing valve body. This allows for a clear and intuitive judgment of the sealing performance of the pressure reducing valve body and whether the pressure gauges meet the standards.

[0004] The aforementioned patent has certain drawbacks: it requires operators to read and compare the pressure gauges on the front, rear, and pressure gauges on the pressure reducing valve body one by one, which is quite troublesome. In addition, the test results may be misjudged due to damage to the pressure gauges. Therefore, a pressure reducing valve airtightness testing device is proposed. Utility Model Content

[0005] The purpose of this utility model is to solve the technical problem that requires operators to read and compare the pressure gauges of the pre-pressure gauge, the post-pressure gauge, and the pressure gauges built into the pressure reducing valve body one by one, which is cumbersome and may lead to misjudgment of the test results due to damage to the pressure gauges. This utility model provides a pressure reducing valve airtightness testing device.

[0006] To achieve the above objectives, this utility model specifically adopts the following technical solution:

[0007] A pressure reducing valve airtightness testing device includes a frame, a top plate slidably mounted on the frame, and positioning rings on both the frame and the top plate. The two positioning rings are respectively inserted and engaged with the inlet and outlet of the pressure reducing valve. A sealing element is provided on the positioning ring. The top plate has a through hole and a cavity that are connected and form a stepped structure. A piston rod is slidably mounted in the cavity, and a pressure plate is provided at the free end of the piston rod.

[0008] Furthermore, the positioning ring is constructed with an inwardly contracting guide cone surface.

[0009] Furthermore, the sealing element includes an annular groove formed on the positioning ring, and a sealing ring that abuts and overlaps with the inlet or outlet of the pressure reducing valve is fitted inside the annular groove.

[0010] Furthermore, an adjusting screw with a thread that passes through the top plate is rotatably mounted on the frame.

[0011] Furthermore, a rope-winding wheel is rotatably mounted on the frame, a pull rope is wound on the rope-winding wheel, a through hole is provided on the frame, the free end of the pull rope passes through the through hole and is provided with a counterweight block that abuts against and overlaps with the pressure plate, and a locking element is provided on the frame for locking or unlocking the rope-winding wheel.

[0012] Furthermore, the pressure plate is provided with an embedding groove, and a magnet that magnetically engages with the counterweight is embedded in the embedding groove.

[0013] Furthermore, the diameter of the perforation is larger than the diameter of the pull rope, and a guiding arc surface is constructed at the opening of the perforation.

[0014] Furthermore, the locking component includes a locking rod mounted on the frame, a pawl rotatably mounted on the locking rod, a torsion spring sleeved on the locking rod between the pawl and the frame, and a ratchet wheel that abuts and engages with the pawl on the rope winding wheel.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] This invention is convenient to use and simple to operate. The presence of air leakage in the pressure reducing valve can be determined by the sliding stroke of the piston rod, and misjudgment of the test results can be avoided, making it more practical. Attached Figure Description

[0017] Figure 1 This is a three-dimensional view of the structure of this utility model;

[0018] Figure 2 This utility model Figure 1 Enlarged view of point A in the middle;

[0019] Figure 3 This is a three-dimensional sectional view of the present invention;

[0020] Figure 4 This utility model Figure 3 Enlarged view of point B in the middle;

[0021] Figure 5 This utility model Figure 3 Enlarged view of point C in the middle;

[0022] Figure 6 This utility model Figure 3 Enlarged view of point D in the middle.

[0023] In the diagram: 1. Frame; 2. Top plate; 3. Positioning ring; 4. Through hole; 5. Cavity; 6. Piston rod; 7. Pressure plate; 8. Guide cone surface; 9. Annular groove; 10. Sealing ring; 11. Adjusting screw; 12. Rope pulley; 13. Pull rope; 14. Perforation; 15. Counterweight; 16. Embedded groove; 17. Magnet; 18. Locking rod; 19. Pawl; 20. Torsion spring; 21. Ratchet. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0025] The pressure reducing valve airtightness testing device provided in this embodiment is mainly used to solve the technical problem that requires operators to read and compare the pressure of the pre-pressure gauge, the post-pressure gauge, and the pressure gauge built into the pressure reducing valve body one by one, which is relatively cumbersome and may lead to misjudgment of the test results due to damage to the pressure gauge. The following technical solution is provided, which will be discussed in conjunction with... Figures 1-6 Please provide a detailed explanation:

[0026] A pressure reducing valve airtightness testing device includes a frame 1, a top plate 2 slidably mounted on the frame 1, the top plate 2 sliding vertically, a positioning ring 3 on both the frame 1 and the top plate 2, two positioning rings 3 coaxially distributed and fixed on the frame 1 and the top plate 2 respectively, the two positioning rings 3 respectively plugging into the inlet and outlet of the pressure reducing valve, the positioning rings 3 are provided with a sealing element, the sealing element seals the inlet or outlet of the pressure reducing valve, the top plate 2 is constructed with a through hole 4 and a cavity 5 that are connected and form a stepped structure, the cavity 5 and the through hole 4 are distributed vertically, the diameter of the cavity 5 is larger than the diameter of the through hole 4, a piston rod 6 is slidably mounted in the cavity 5, the piston rod 6 slides vertically, a pressure plate 7 is provided at the free end of the piston rod 6, the pressure plate 7 is horizontal and fixed at the top of the piston rod 6;

[0027] In the initial state, piston rod 6 is in its initial position and away from through hole 4, and pressure plate 7 is in its initial position and away from top plate 2. During use, the pressure reducing valve is placed vertically on frame 1, with the positioning ring 3 on frame 1 inserted into the inlet or outlet of the pressure reducing valve. The top plate 2 slides until it contacts and overlaps with the top of the pressure reducing valve. The positioning ring 3 on top plate 2 is inserted into the inlet or outlet of the pressure reducing valve, and the inlet and outlet of the pressure reducing valve are sealed by two seals. The interior of the pressure reducing valve, through hole 4, and cavity 5 are connected from bottom to top, driving pressure plate 7 to move downwards, causing piston rod 6 to slide downwards to its limit position and close to through hole 4. During this process, the air inside the cavity 5, through hole 4, and pressure reducing valve will be compressed. If there is a leak in the pressure reducing valve, the piston rod 6 can continue to slide down to the limit position and block the through hole 4. Conversely, if the piston rod 6 cannot slide down to the limit position, it means that there is no leak in the pressure reducing valve, so as to realize the leak detection of the pressure reducing valve. After the detection is completed, the top plate 2 is slid to the top away from the pressure reducing valve, and the positioning ring 3 on the top plate 2 is removed from the inlet or outlet of the pressure reducing valve. The piston rod 6 is slid up to the initial position, and then the pressure reducing valve is removed from the frame 1. The positioning ring 3 on the frame 1 is removed from the inlet or outlet of the pressure reducing valve.

[0028] In summary, this application is convenient to use and simple to operate. It can determine whether there is air leakage in the pressure reducing valve by the sliding stroke of the piston rod 6, and at the same time, it can avoid misjudgment of the test results, thus making it more practical.

[0029] like Figure 5 As shown, in this embodiment, the positioning ring 3 is constructed with an inwardly contracting guide cone surface 8;

[0030] Referring to the above, when the positioning ring 3 is inserted into the inlet or outlet of the pressure reducing valve, the setting of the guide cone surface 8 facilitates quick positioning and makes operation more convenient.

[0031] like Figure 5 As shown, in this embodiment, the sealing element includes an annular groove 9 formed on the positioning ring 3. The annular groove 9 is coaxially distributed with the positioning ring 3. A sealing ring 10 is fitted inside the annular groove 9 to abut and overlap with the inlet or outlet of the pressure reducing valve. The sealing ring 10 is made of rubber and can be deformed.

[0032] Referring to the above, in the initial state, the sealing ring 10 is in a natural state and does not completely fill the annular groove 9. When the positioning ring 3 is inserted into the inlet or outlet of the pressure reducing valve, it will force the sealing ring 10 to deform and completely fill the annular groove 9. The sealing ring 10 will then collide with the inlet or outlet of the pressure reducing valve to form a seal.

[0033] like Figure 1 As shown, in this embodiment, an adjusting screw 11 with a thread passing through the top plate 2 is rotatably provided on the frame 1, and the adjusting screw 11 is in a vertical direction;

[0034] Referring to the above, when in use, driving the adjusting screw 11 to rotate forward or reverse will cause the top plate 2 to slide downward or upward due to the thread action. Through the self-locking property of the threaded engagement, the top plate 2 can be easily positioned, making the top plate 2 more tightly contact the top of the pressure reducing valve, which helps to ensure the sealing performance.

[0035] like Figures 2-6 As shown, in this embodiment, a rope-winding wheel 12 is rotatably mounted on the frame 1. The rope-winding wheel 12 is in a horizontal direction, and a pull rope 13 is wound on the rope-winding wheel 12. A through hole 14 is opened on the frame 1. The through hole 14 is in a vertical direction. The free end of the pull rope 13 passes through the through hole 14 and is provided with a counterweight 15 that abuts against and overlaps with the pressure plate 7. The counterweight 15 is fixed to the free end of the pull rope 13 and abuts against and overlaps with the frame 1. A locking member is provided on the frame 1 for locking or unlocking the rope-winding wheel 12.

[0036] Referring to the above, in the initial state, the winding wheel 12 tightens the pull rope 13, and the counterweight 15 is in the initial position and abuts against the frame 1. The winding wheel 12 is locked by the locking device. In use, the winding wheel 12 is unlocked by the locking device, and the counterweight 15 falls due to gravity. The winding wheel 12 loosens the pull rope 13, and the counterweight 15 moves downward and abuts against the pressure plate 7. The gravity of the counterweight 15 drives the pressure plate 7 and the piston rod 6 to move downward together. There is no need for manual pressing of the pressure plate 7, making the operation more convenient. Conversely, after the test is completed, the winding wheel 12 is driven to rotate, tightening the pull rope 13 and driving the counterweight 15 to move upward to the initial position. Then the winding wheel 12 is locked again by the locking device.

[0037] like Figure 4 As shown, in this embodiment, the pressure plate 7 is provided with an embedding groove 16, and a magnet 17 that magnetically engages with the counterweight 15 is embedded in the embedding groove 16. The magnet 17 is fixed in the embedding groove 16.

[0038] Referring to the above, when the counterweight 15 moves downward and comes into contact with the pressure plate 7, the magnet 17 will be attracted to the counterweight 15. When the counterweight 15 moves upward to the initial position, the magnetic attraction will drive the pressure plate 7 and the piston rod 6 to move upward together. After that, the counterweight 15 moves away from the magnet 17 and the pressure plate 7, so as to realize the automatic reset of the pressure plate 7 and the piston rod 6, making the operation more convenient.

[0039] like Figure 6 As shown, in this embodiment, the diameter of the perforation 14 is larger than the diameter of the pull rope 13, and a guiding arc surface is constructed at the opening of the perforation.

[0040] Referring to the above, when the pull rope 13 is tightened or loosened, the shape of the perforation 14 can reduce the friction between the pull rope 13 and the perforation 14, thereby extending the service life of the pull rope 13 and improving the stability of use.

[0041] like Figure 2 As shown, in this embodiment, the locking component includes a locking rod 18 mounted on the frame 1. The locking rod 18 is horizontal and fixed on the frame 1. A pawl 19 is rotatably mounted on the locking rod 18. The pawl 19 is fixed on the locking rod 18. A torsion spring 20 is mounted on the locking rod 18 between the pawl 19 and the frame 1. The two ends of the torsion spring 20 are fixedly connected to the pawl 19 and the frame 1, respectively. A ratchet 21 is mounted on the rope wheel 12 and engages with the pawl 19. The ratchet 21 is vertical and fixed on the rope wheel 12.

[0042] Referring to the above, in the initial state, the torsion spring 20 is in its natural state, and the pawl 19 is in contact with the ratchet 21. Due to the obstruction of the pawl 19, neither the ratchet 21 nor the rope wheel 12 can rotate, and the counterweight 15 cannot fall, thus locking the rope wheel 12. Conversely, when the pawl 19 is moved away from the ratchet 21, the torsion spring 20 is compressed, allowing the ratchet 21 and the rope wheel 12 to rotate, and the counterweight 15 to fall. When the pawl 19 is released, the torsion spring 20 returns to its natural state. When the ratchet 19 is in its natural position, it re-engages with the ratchet 21, preventing both the ratchet 21 and the rope wheel 12 from rotating. After the test is completed, the rope wheel 12 is driven to rotate, tightening the rope 13 and causing the ratchet 21 to rotate as well. The ratchet 19 rotates intermittently, causing the torsion spring 20 to be repeatedly squeezed and reset. When the rope wheel 12 stops rotating, the torsion spring 20 returns to its natural position, and the ratchet 19 re-engages with the ratchet 21, thereby relocking the rope wheel 12.

[0043] The working process of this utility model is as follows: The pressure reducing valve is placed vertically on the frame 1, and the positioning ring 3 on the frame 1 is inserted into the inlet or outlet of the pressure reducing valve. The top plate 2 is slid until it abuts against the top of the pressure reducing valve. The positioning ring 3 on the top plate 2 is inserted into the inlet or outlet of the pressure reducing valve, and the inlet and outlet of the pressure reducing valve are sealed by two sealing elements respectively. The interior of the pressure reducing valve, the through hole 4, and the cavity 5 are connected from bottom to top, driving the pressure plate 7 to move downward, causing the piston rod 6 to slide downward to a position close to the limit and near the through hole 4. During this process, the cavity 5, the through hole 4, and the pressure reducing valve are connected. The air inside the valve is compressed. If there is a leak in the pressure reducing valve, the piston rod 6 can slide down to the limit position and block the through hole 4. Conversely, if the piston rod 6 cannot slide down to the limit position, it means that there is no leak in the pressure reducing valve, thus realizing the leak detection of the pressure reducing valve. After the detection is completed, the top plate 2 is slid to the top away from the pressure reducing valve, and the positioning ring 3 on the top plate 2 is removed from the inlet or outlet of the pressure reducing valve. The piston rod 6 is slid up to the initial position, and then the pressure reducing valve is removed from the frame 1. The positioning ring 3 on the frame 1 is removed from the inlet or outlet of the pressure reducing valve.

[0044] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A pressure reducing valve airtightness testing device, characterized in that, Includes a frame (1), on which a top plate (2) is slidably disposed. Both the frame (1) and the top plate (2) are provided with positioning rings (3). The two positioning rings (3) are respectively inserted and cooperated with the inlet and outlet of the pressure reducing valve. The positioning rings (3) are provided with sealing elements. The top plate (2) is constructed with a through hole (4) and a cavity (5) that are connected and form a stepped structure. A piston rod (6) is slidably disposed in the cavity (5). A pressure plate (7) is provided at the free end of the piston rod (6).

2. The pressure reducing valve airtightness testing device according to claim 1, characterized in that: The positioning ring (3) is constructed with an inwardly contracting guide cone surface (8).

3. The pressure reducing valve airtightness testing device according to claim 1, characterized in that: The sealing element includes an annular groove (9) formed on the positioning ring (3), and a sealing ring (10) is fitted inside the annular groove (9) to abut against or overlap with the inlet or outlet of the pressure reducing valve.

4. The pressure reducing valve airtightness testing device according to claim 1, characterized in that: An adjusting screw (11) with a thread passing through the top plate (2) is rotatably mounted on the frame (1).

5. The pressure reducing valve airtightness testing device according to claim 1, characterized in that: A rope-winding wheel (12) is rotatably mounted on the frame (1), and a pull rope (13) is wound on the rope-winding wheel (12). A through hole (14) is provided on the frame (1), and the free end of the pull rope (13) passes through the through hole (14) and is provided with a counterweight (15) that abuts against and overlaps with the pressure plate (7). A locking element for locking or unlocking the rope-winding wheel (12) is provided on the frame (1).

6. The pressure reducing valve airtightness testing device according to claim 5, characterized in that: The pressure plate (7) has an embedded groove (16), and a magnet (17) is embedded in the embedded groove (16) to magnetically engage with the counterweight (15).

7. The pressure reducing valve airtightness testing device according to claim 5, characterized in that: The diameter of the perforation (14) is larger than the diameter of the pull rope (13), and a guiding arc surface is constructed at the opening of the perforation.

8. The pressure reducing valve airtightness testing device according to claim 5, characterized in that: The locking component includes a locking rod (18) mounted on the frame (1), a pawl (19) rotatably mounted on the locking rod (18), a torsion spring (20) sleeved on the locking rod (18) between the pawl (19) and the frame (1), and a ratchet (21) that abuts against the pawl (19) mounted on the rope wheel (12).

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