Air tightness detection equipment for single valve
By using a hydraulic rod to drive a sliding plate and a negative pressure fan to extract airflow, the design solves the problems of long testing time and limited applicability of existing equipment, and achieves efficient and accurate airtightness testing of single valves of different specifications.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SMETIC (KUNSHAN) PRECISION MASCH CO LTD
- Filing Date
- 2025-06-06
- Publication Date
- 2026-04-21
AI Technical Summary
Existing airtightness testing equipment has an excessively long testing cycle when testing large-volume single valves or single valves with high airtightness requirements. Furthermore, the testing interfaces and tooling fixtures are difficult to be compatible with single valves of different sizes and structures, resulting in the need to equip multiple dedicated devices and reducing the applicability of the equipment.
A sliding plate driven by a hydraulic rod and an adjustable clamping plate structure were designed. Combined with a negative pressure fan and a sealing sleeve, the position of the clamping plate is adjusted by the hydraulic rod, and the airflow is drawn by the negative pressure fan to improve the sealing performance, which can be adapted to the fixing and sealing of single valves of different specifications.
It enables flexible adaptation to single valves of different specifications, shortens the testing time, improves the testing accuracy and the applicability of the equipment, and avoids the need to equip multiple dedicated devices.
Smart Images
Figure CN224151917U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of valve airtightness testing technology, and in particular to an airtightness testing device for a single valve. Background Technology
[0002] A single valve is a basic component in a fluid transport system used to control fluid flow. It regulates the flow rate and direction of the medium by opening, closing, or partially opening. The working principle of a valve is based on the control of the fluid channel. When the valve is open, the fluid can flow freely in the pipeline. The fluid flow rate through the valve depends on factors such as the valve type, diameter, and pressure difference between the upstream and downstream sides. When the valve is closed, the valve's sealing components cut off the pipeline channel, preventing the fluid from continuing to flow. Some single valves can also control the fluid flow rate by adjusting the valve opening. During the testing of a single valve, airtightness testing equipment needs to be used in conjunction with it.
[0003] Existing testing equipment suffers from long testing times. When using the pressure decay method for airtightness testing, the pressure stabilization time and pressure holding time are excessively long, especially for large-capacity single valves or single valves with extremely high airtightness requirements. A single testing cycle can take several minutes or even longer, severely impacting overall testing efficiency. The current solution is to use a differential pressure testing method for large-capacity single valves. By comparing the pressure changes of a standard container and the tested single valve, the airtightness of the large-capacity single valve can be quickly determined, improving testing efficiency. However, there are still limitations in compatibility. This means that the equipment is designed for single valves of specific specifications and types, and the testing interfaces and tooling fixtures need to be compatible with single valves of different sizes and structures. When a company produces single valves of various specifications, it needs to equip multiple dedicated testing devices, reducing the equipment's compatibility. Utility Model Content
[0004] To overcome the above shortcomings, this utility model provides an airtightness testing device for single valves, aiming to improve the problem in the prior art where the testing interface and tooling fixtures are difficult to be compatible with single valves of different sizes and structures, requiring multiple dedicated testing devices, which reduces the range of equipment compatibility.
[0005] To achieve the above objectives, the present invention adopts the following technical solution: an airtightness testing device for a single valve, comprising a working frame, a support fixedly connected to the middle of the top wall of the working frame, a connecting plate fixedly connected to the top wall of the support, testing injection devices fixedly connected to the left and right sides of the inner side of the connecting plate, a fixing plate fixedly connected to the middle of the front side of the support, engaging grooves provided at the left and right ends of the front side of the fixing plate, hydraulic rods fixedly connected to the left and right ends of the bottom front side of the connecting plate, a sliding plate fixedly connected to the front side of the hydraulic rod, a limiting shell fixedly connected to the left and right ends of the rear side of the sliding plate, a threaded rod rotatably connected to the rear end of the inner wall of the limiting shell, a knob fixedly connected to the front end of the threaded rod penetrating the front side of the sliding plate, a clamping plate threadedly connected to the outer wall of the threaded rod, the outer wall of the clamping plate slidingly connected to the interior of the limiting shell, and a sealing mechanism provided on the top wall of the fixing plate, the sealing mechanism being used to improve the sealing performance during testing.
[0006] As a further description of the above technical solution:
[0007] The sealing mechanism includes a connecting frame, the bottom wall of which is fixedly connected to the top of the fixed plate. A negative pressure fan is fixedly connected to the top of the connecting frame. Two negative pressure pipes are connected to the front side of the negative pressure fan. A switching valve is fixedly installed in the middle of the negative pressure pipe. A sealing sleeve is connected to the end of the switching valve. The top of the inner wall of the sealing sleeve engages with the bottom of the detection injection device.
[0008] As a further description of the above technical solution:
[0009] The sealing mechanism also includes two rubber rings, the outer walls of which are respectively fixedly connected to the outer ends of the corresponding negative pressure pipes.
[0010] As a further description of the above technical solution:
[0011] A control switch is fixedly connected to the left side of the bracket. The control switch is electrically connected to the detection injection device, the hydraulic rod, the negative pressure fan, and the switching valve.
[0012] As a further description of the above technical solution:
[0013] Multiple rubber blocks are fixedly connected to the outer walls of both knobs, and the multiple rubber blocks are arranged in an equidistant ring.
[0014] As a further description of the above technical solution:
[0015] An observation window is fixedly connected to the front side of the sliding plate, and the front side of the observation window has a smooth design.
[0016] As a further description of the above technical solution:
[0017] Both clamps are fixedly connected to the rear side with rubber pads, and both rubber pads are designed in an arc shape.
[0018] As a further description of the above technical solution:
[0019] The front and rear sides of the work frame are each fixedly connected to two connecting seats, and the connecting seats are fixedly connected to a support column inside.
[0020] This utility model has the following beneficial effects:
[0021] 1. In this utility model, the sliding plate is moved backward by the hydraulic rod, so as to initially position the single valve to be tested. Then, by rotating the knob, the threaded rod drives the clamping plate to slide inside the limiting shell, so as to adjust the position of the clamp according to the specifications of different single valves. This avoids the need to equip multiple special testing devices, which would reduce the applicability of the equipment.
[0022] 2. In this utility model, by starting the negative pressure fan, the airflow can be extracted under the opening of the switching valve. Thus, with the negative pressure pipe connected, the negative pressure pipe can extract the airflow inside the sealing sleeve. Since the sealing sleeve is sleeved with the single valve and the detection injection device, the internal space can be reduced as the airflow is extracted, thereby improving the deformation of the sealing sleeve and improving the sealing effect at the connection position between the detection injection device and the single valve, thus ensuring the accuracy of the detection. Attached Figure Description
[0023] Figure 1 This is a perspective view of an airtightness testing device for a single valve proposed in this utility model;
[0024] Figure 2 This is a front view of an airtightness testing device for a single valve proposed in this utility model;
[0025] Figure 3 This is a side view of an airtightness testing device for a single valve proposed in this utility model;
[0026] Figure 4 This is an exploded view of the limiting shell of a single-valve airtightness testing device proposed in this utility model;
[0027] Figure 5 This is a schematic diagram of the sealing mechanism of a single-valve airtightness testing device proposed in this utility model.
[0028] Legend:
[0029] 1. Working frame; 2. Sealing mechanism; 201. Connecting frame; 202. Negative pressure fan; 203. Negative pressure pipe; 204. Converting valve; 205. Sealing sleeve; 206. Rubber ring; 3. Bracket; 4. Connecting plate; 5. Detection injection equipment; 6. Fixing plate; 7. Hydraulic rod; 8. Sliding plate; 9. Limiting shell; 10. Threaded rod; 11. Clamping plate; 12. Rubber pad; 13. Knob; 14. Rubber block; 15. Control switch; 16. Observation window; 17. Connecting seat; 18. Support column; 19. Engaging groove. Detailed Implementation
[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0031] Reference Figure 1 , Figure 3 and Figure 5 This utility model provides an embodiment of an airtightness testing device for a single valve, comprising a work frame 1, a support 3 fixedly connected to the middle of the top wall of the work frame 1, and a connecting plate 4 fixedly connected to the top wall of the support 3. The connecting plate 4 supports two testing injection devices 5, which are used to perform a sealing test on the single valve. The testing injection devices 5 are fixedly connected to the left and right sides of the inside of the connecting plate 4. A fixing plate 6 is fixedly connected to the middle of the front side of the support 3. The left and right ends of the front side of the fixing plate 6 are provided with locking grooves 19, which can cooperate with the clamping plate 11 to fix the single valve. The left and right ends of the bottom front side of the connecting plate 4 are fixedly connected to hydraulic rods 7, and the front side of the hydraulic rods 7 is fixedly connected to sliding plates 8, so that when the hydraulic rods 7 are activated, their front ends can drive... The sliding plate 8 slides to initially fix the single valve. The left and right ends of the rear side of the sliding plate 8 are fixedly connected to the limiting shell 9. The inner rear end of the limiting shell 9 is rotatably connected to the threaded rod 10. The front end of the threaded rod 10 passes through the front side of the sliding plate 8 and is fixedly connected to the knob 13. When the knob 13 is rotated, the threaded rod 10 rotates synchronously. Then the clamping plate 11 can slide inside the limiting shell 9 under the rotation of the threaded rod 10. The outer wall of the threaded rod 10 is threadedly connected to the clamping plate 11. Thus, the clamping plate 11 can meet the specific fixing requirements of the single valve and complete the fixing of the single valve with the locking groove 19, thereby improving the adaptability of the device. The outer wall of the clamping plate 11 is slidably connected to the inside of the limiting shell 9. The top wall of the fixing plate 6 is provided with a sealing mechanism 2. The sealing mechanism 2 is used to improve the sealing performance during testing.
[0032] Specifically, a bracket 3 is fixedly connected to the middle of the top wall of the work frame 1, and a connecting plate 4 is fixedly connected to the top wall of the bracket 3. The connecting plate 4 is used to support two testing injection devices 5. The testing injection devices 5 can perform sealing tests on a single valve. The testing injection devices 5 are fixedly connected to the left and right sides inside the connecting plate 4. A fixing plate 6 is fixedly connected to the middle of the front side of the bracket 3. The left and right ends of the front side of the fixing plate 6 are provided with locking grooves 19. The two locking grooves 19 can cooperate with the clamping plate 11 to fix the single valve. Hydraulic rods 7 are fixedly connected to the left and right ends of the bottom front side of the connecting plate 4. A sliding plate 8 is fixedly connected to the front side of the hydraulic rods 7. When started, its front end drives the sliding plate 8 to slide and move, initially fixing the single valve. The left and right ends of the rear side of the sliding plate 8 are fixedly connected to the limiting shell 9. The rear end of the inner wall of the limiting shell 9 is rotatably connected to the threaded rod 10. The front end of the threaded rod 10 passes through the front side of the sliding plate 8 and is fixedly connected to the knob 13. When the knob 13 is rotated, the threaded rod 10 rotates synchronously. The clamping plate 11 slides inside the limiting shell 9 under the rotation of the threaded rod 10. The outer wall of the threaded rod 10 is threadedly connected to the clamping plate 11. The clamping plate 11 can cooperate with the locking groove 19 to fix the single valve according to the specific fixing requirements of the single valve, thus improving the adaptability of the device.
[0033] Reference Figure 1 , Figure 2 and Figure 5 The sealing mechanism 2 includes a connecting frame 201. The bottom wall of the connecting frame 201 is fixedly connected to the top of the fixing plate 6. The connecting frame 201 supports and fixes the negative pressure fan 202. The top of the connecting frame 201 is fixedly connected to the negative pressure fan 202. The front side of the negative pressure fan 202 is connected to two negative pressure pipes 203. When the negative pressure fan 202 is started, it draws air through the negative pressure pipes 203. A switching valve 204 is fixedly installed in the middle of the negative pressure pipe 203. The end of the switching valve 204 is connected to a sealing sleeve 205. The space inside the sealing sleeve 205 is reduced, which improves the sealing between the single valve and the detection injection device 5 and improves the detection accuracy. The top of the inner wall of the sealing sleeve 205 is engaged with the bottom of the detection injection device 5.
[0034] Specifically, the bottom wall of the connecting frame 201 is fixed to the top of the fixing plate 6, which serves to support and fix the negative pressure fan 202. The negative pressure fan 202 is fixedly connected to the top of the connecting frame 201, and its front side is connected to two negative pressure pipes 203. When the negative pressure fan 202 is started, it can draw airflow through the negative pressure pipes 203. The switching valve 204 is fixedly installed in the middle of the negative pressure pipe 203, and its end is connected to the sealing sleeve 205. The switching valve 204 can change the airflow channel structure, reduce the internal space of the sealing sleeve 205, thereby enhancing the sealing between the single valve and the detection injection device 5. The top of the inner wall of the sealing sleeve 205 is engaged with the bottom of the detection injection device 5 to ensure that the two are tightly connected, reduce gas leakage during the detection process, and effectively improve the detection accuracy.
[0035] Reference Figure 1, Figure 4 and Figure 5 The sealing mechanism 2 also includes two rubber rings 206, the outer walls of which are fixedly connected to the outer ends of the corresponding negative pressure pipes 203; a control switch 15 is fixedly connected to the left side of the bracket 3, and the control switch 15 is electrically connected to the detection injection device 5, the hydraulic rod 7, the negative pressure fan 202 and the switching valve 204 respectively; multiple rubber blocks 14 are fixedly connected to the outer walls of the two knobs 13, and the multiple rubber blocks 14 are arranged in an equidistant ring;
[0036] Specifically, the rubber ring 206 protects the connection of the negative pressure pipe 203, thereby reducing wear at the connection point of the negative pressure pipe 203. The control switch 15, which is electrically connected to the detection injection device 5, the hydraulic rod 7, the negative pressure fan 202 and the switching valve 204 respectively, enables the control switch 15 to turn the equipment on and off. Multiple rubber blocks 14 enhance the protection of the knob 13.
[0037] Reference Figure 1 , Figure 2 and Figure 3 An observation window 16 is fixedly connected to the front side of the sliding plate 8, and the front side of the observation window 16 has a smooth design; rubber pads 12 are fixedly connected to the rear side of the two clamping plates 11, and the two rubber pads 12 have an arc design; two connecting seats 17 are fixedly connected to the front and rear sides of the work frame 1, and a support column 18 is fixedly connected inside the connecting seat 17.
[0038] Specifically, the connection of the observation window 16 allows for observation of the testing process, the connection of the rubber pad 12 improves the fixing effect of the clamp 11 on the single valve, and the connection of the connecting seat 17 and the support column 18 improves the stability of the equipment during operation.
[0039] Working principle: The sealing performance of a single valve can be tested by the injection testing device 5. The injection testing device 5 is fixedly connected to both the left and right sides of the connecting plate 4. A fixing plate 6 is fixed to the middle of the front side of the bracket 3. The locking grooves 19 on the left and right ends of its front side can cooperate with the clamping plate 11 to fix the single valve. A hydraulic rod 7 is fixed to the left and right ends of the bottom front side of the connecting plate 4, with its front end connected to a sliding plate 8. When the hydraulic rod 7 is activated, it drives the sliding plate 8 to slide forward or backward. During single valve testing, the hydraulic rod 7 drives the sliding plate 8 to move backward, initially positioning the single valve to be tested. A limiting shell 9 is fixed to the left and right ends of the rear side of the sliding plate 8. A threaded rod 10 is rotatably connected to the rear end of the inner wall of the limiting shell 9. The front end of the threaded rod 10 passes through the front side of the sliding plate 8 and is connected to a knob 13. Rotation... When knob 13 is turned, threaded rod 10 rotates synchronously. Since the outer wall of threaded rod 10 is threadedly connected to clamping plate 11, and the outer wall of clamping plate 11 is slidably connected to the inside of limiting shell 9, clamping plate 11 slides inside limiting shell 9 when threaded rod 10 rotates. According to the specifications of different single valves, the clamping plate 11 is slidably displaced by turning knob 13, and the position of clamping plate 11 is adjusted so that it can cooperate with the locking groove 19 on fixing plate 6 to complete the fixing of single valves of different specifications. This avoids the situation of reducing the applicability of the equipment due to the need to equip multiple special testing equipment. By adjusting the position of clamping plate 11, the adaptability range of the device to different single valves is improved, and the sealing test requirements of various single valves are met, so that the device can be used more efficiently and flexibly in single valve sealing test.
[0040] Furthermore, the bottom wall of the connecting frame 201 is fixed to the top of the fixing plate 6, and the top is fixed with a negative pressure fan 202. The front side of the negative pressure fan 202 is connected to two negative pressure pipes 203. A switching valve 204 is installed in the middle of the negative pressure pipe 203. The end of the switching valve 204 is connected to a sealing sleeve 205. The top of the inner wall of the sealing sleeve 205 is engaged with the bottom of the detection injection device 5. When the negative pressure fan 202 is started and the switching valve 204 is opened, the negative pressure fan 202 draws airflow through the negative pressure pipe 203. Because the sealing sleeve 205 is connected to the single valve and the detection injection device 5, the airflow inside the sealing sleeve 205 is drawn out under the action of the negative pressure pipe 203, and its internal space shrinks accordingly. As the space shrinks, the sealing sleeve 205 deforms, which improves the sealing effect at the connection between the single valve and the detection injection device 5, thereby ensuring the accuracy of the single valve sealing test.
[0041] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A leak tightness testing apparatus for single valve comprising a working frame (1) characterized in that: A bracket (3) is fixedly connected to the middle of the top wall of the work frame (1). A connecting plate (4) is fixedly connected to the top wall of the bracket (3). Detection injection devices (5) are fixedly connected to the left and right sides of the inside of the connecting plate (4). A fixing plate (6) is fixedly connected to the middle of the front side of the bracket (3). The left and right ends of the front side of the fixing plate (6) are provided with engagement grooves (19). Hydraulic rods (7) are fixedly connected to the left and right ends of the bottom front side of the connecting plate (4). A sliding plate (8) is fixedly connected to the front side of the hydraulic rod (7). The left and right ends of the rear side of the plate (8) are fixedly connected to the limiting shell (9). The inner rear end of the limiting shell (9) is rotatably connected to the threaded rod (10). The front end of the threaded rod (10) passes through the front side of the sliding plate (8) and is fixedly connected to the knob (13). The outer wall of the threaded rod (10) is threadedly connected to the clamping plate (11). The outer wall of the clamping plate (11) is slidably connected to the inside of the limiting shell (9). The top wall of the fixed plate (6) is provided with a sealing mechanism (2). The sealing mechanism (2) is used to improve the sealing performance during testing.
2. The airtightness testing device for a single valve according to claim 1, characterized in that: The sealing mechanism (2) includes a connecting frame (201), the bottom wall of which is fixedly connected to the top of the fixed plate (6), and a negative pressure fan (202) is fixedly connected to the top of the connecting frame (201). The front side of the negative pressure fan (202) is connected to two negative pressure pipes (203), and a switching valve (204) is fixedly installed in the middle of the negative pressure pipe (203). The end of the switching valve (204) is connected to a sealing sleeve (205), and the top of the inner wall of the sealing sleeve (205) is engaged with the bottom end of the detection injection device (5).
3. A leak tightness testing apparatus for a single valve according to claim 2, wherein: The sealing mechanism (2) also includes two rubber rings (206), the outer walls of which are respectively fixedly connected to the outer end of the corresponding negative pressure pipe (203).
4. The leak detection apparatus for a single valve according to claim 2, wherein: A control switch (15) is fixedly connected to the left side of the bracket (3). The control switch (15) is electrically connected to the detection injection device (5), the hydraulic rod (7), the negative pressure fan (202), and the switching valve (204).
5. The leak detection apparatus for a single valve as claimed in claim 1, wherein: Multiple rubber blocks (14) are fixedly connected to the outer walls of both knobs (13), and the multiple rubber blocks (14) are arranged in an equidistant ring.
6. The leak detection apparatus for a single valve according to claim 1, wherein: An observation window (16) is fixedly connected to the front side of the sliding plate (8), and the front side of the observation window (16) is designed to be smooth.
7. The leak detection apparatus for a single valve according to claim 1, wherein: Both of the clamps (11) are fixedly connected to the rear side with rubber pads (12), and both rubber pads (12) are designed in an arc shape.
8. The leak detection apparatus for a single valve according to claim 1, wherein: The work frame (1) has two connecting seats (17) fixedly connected to its front and rear sides, and a support column (18) is fixedly connected inside the connecting seat (17).