Pressure testing device for sealing ring

Abstract

The utility model relates to a pressure testing device for a sealing ring. The pressure testing device comprises a pressing plate and a fixing assembly. The at least two pressing plates are arranged in a stacked mode and connected through a fixing assembly. And a pressure test workpiece to be subjected to pressure test is clamped between the at least two laminated pressing plates. And at least two pressing plates are provided with air inlets and air outlets which penetrate through the pressing plates and are arranged in a staggered manner along the thickness direction of the pressing plates. And the air inlet and the air outlet are positioned in an annular space formed by the at least two laminated pressing plates. According to the utility model, through the annular space formed by the air inlet, the air outlet, the pressure test workpiece, the first pressure plate and the second pressure plate, the pressure generated by the high-pressure pump or the high-pressure air compressor is transmitted to the pressure test device, and the pressure test device compresses the pressure test workpiece at two ends so as to carry out pressure test detection on dynamic and static sealing ring products. Therefore, the pressure test workpiece is accurately ensured to reach the preset pressure detection pressure, and the device is suitable for testing sealing rings of different sizes.

Description

Technical Field

[0001] This utility model relates to the field of sealing ring pressure testing, and in particular to a pressure testing device for sealing rings. Background Technology

[0002] As a crucial mechanical component, sealing rings are widely used in various equipment, making the testing of their sealing performance essential. Traditional sealing ring pressure testing devices have several shortcomings. For example, some devices use flanges and gaskets installed within a closed system, testing the seal by applying water or air pressure. However, this method is costly and prone to safety hazards under high pressure. Furthermore, existing mechanical seal pressure testing devices are inefficient, and some cannot maintain a constant ambient air pressure during testing, leading to inaccurate results. Additionally, traditional devices have relatively simple sealing structures, limited sealing coverage area, high leakage rates, and insufficient pressure resistance (typically ≤2MPa), failing to meet high-pressure testing requirements.

[0003] Furthermore, existing sealing ring pressure testing fixtures are mostly designed for a single specification, lacking versatility. Changing sizes requires redesigning the fixture, resulting in high costs and low efficiency. Traditional pressure testing fixtures also lack pressure relief designs, posing safety hazards.

[0004] Chinese patent document CN119086047A discloses a sealing ring performance testing system, including: a testing fixture comprising a mating upper flange and a lower flange, the lower flange having a sealing groove and a leak detection hole communicating with the sealing groove, the sealing groove being located on the side of the lower flange facing the upper flange for mounting the sealing ring to be tested, one end of the leak detection hole communicating with the sealing groove, and the other end being used for detachably mounting different performance testing devices, including a cold and hot state leakage performance testing device, a water pressure performance testing device, a thermal cycling testing device, and a stress relaxation testing device. The system and method provided by this patent are used to perform performance testing on sealing rings, ensuring the sealing effect and reliability of the sealing rings under actual working conditions. However, this patent requires the integration of multiple complex testing devices, resulting in high costs and potential safety hazards under high pressure.

[0005] Therefore, a new type of sealing ring pressure testing device is needed. This utility model provides a pressure testing device with strong versatility and adaptability to sealing rings of multiple specifications, which can effectively solve the above problems, improve the efficiency and accuracy of pressure testing, reduce the leakage rate, increase the pressure testing pressure, and ensure operational safety.

[0006] Furthermore, on the one hand, there are differences in understanding among those skilled in the art; on the other hand, the applicant studied a large number of documents and patents when making this utility model, but due to space limitations, not all details and contents were listed in detail. However, this does not mean that this utility model does not have the features of these prior art. On the contrary, this utility model has all the features of the prior art, and the applicant reserves the right to add relevant prior art to the background art. Utility Model Content

[0007] To address the shortcomings of existing technologies, this utility model provides a pressure testing device for sealing rings, comprising pressure plates and a fixing assembly. At least two pressure plates are stacked and connected by the fixing assembly. The workpiece to be tested is held between the at least two stacked pressure plates. At least two pressure plates have through-holes and staggered exhaust ports along their thickness direction. The air inlets and exhaust ports are located within the annular space formed by the at least two stacked pressure plates.

[0008] According to a preferred embodiment, the fixing assembly includes a central shaft located between and through at least two pressure plates, and a locking shaft surrounding the circumferential edges of the at least two pressure plates and passing through them. The central shaft and the locking shaft are bolted to the pressure plates to lock the at least two pressure plates.

[0009] According to a preferred embodiment, the pressure plate has a sealing surface facing the workpiece to be tested and an outer contact surface facing away from the workpiece. The workpiece to be tested is disposed on the sealing surfaces of at least two pressure plates and at the circumferential edges of the sealing surfaces of the two pressure plates. An opening is provided on the pressure plate. A central shaft and a locking shaft pass through the opening through the sealing surface and the outer contact surface of the pressure plate.

[0010] According to a preferred embodiment, a bushing is provided on the axis between at least two pressure plates. The central shaft is arranged to pass through the bushing.

[0011] According to a preferred embodiment, the bushing is fitted with at least two pressure plates. The bushing, the test workpiece, and the at least two pressure plates form an annular space.

[0012] According to a preferred embodiment, both the air inlet and the exhaust outlet are connected to the annular space. High-pressure connecting pipes are provided at both the air inlet and the exhaust outlet.

[0013] According to a preferred embodiment, the device further includes a first sealing ring disposed on the sealing surface of the pressure plate and attached between the test workpiece and the pressure plate. At least two first sealing rings are respectively attached to the sealing surfaces of at least two pressure plates to form a first sealing surface of an annular space.

[0014] According to a preferred embodiment, the device further includes a second sealing ring, which is attached to the sealing surface of the pressure plate. At least two second sealing rings are arranged to pass through the first sealing ring and the exhaust port, and through the first sealing ring and the intake port, to form a second sealing surface.

[0015] According to a preferred embodiment, when the test workpiece is located between at least two pressure plates, a first sealing ring and a second sealing ring are disposed between the test workpiece and the pressure plates and locked by a locking shaft, so that the pressure plates seal the test workpiece in the form of a multi-stage sealing surface.

[0016] According to a preferred embodiment, the device further includes a third sealing ring, which is attached between the sealing surface of the pressure plate and the bushing. Attached Figure Description

[0017] Figure 1 This is a simplified structural diagram of a pressure testing device for a sealing ring according to a preferred embodiment of the present invention;

[0018] Figure 2 This is a simplified structural diagram of a bushing according to a preferred embodiment of the present invention.

[0019] List of reference numerals

[0020] 1: First pressure plate; 2: First sealing ring; 3: Second sealing ring; 4: Bushing; 5: Third sealing ring; 6: First spring washer; 7: Locking shaft; 8: Second pressure plate; 9: Air inlet; 10: Second spring washer; 11: Central shaft; 12: Test workpiece; 13: Exhaust port. Detailed Implementation

[0021] The following is a detailed explanation with reference to the accompanying drawings.

[0022] Example 1

[0023] This utility model provides a pressure testing device for sealing rings, such as... Figure 1As shown, the device includes pressure plates and fixing components. At least two pressure plates are stacked and connected by the fixing components. The workpiece 12 to be tested is held between the at least two stacked pressure plates. At least two pressure plates have through-holes 9 and exhaust ports 13 arranged staggered along their thickness direction. The air inlets 9 and exhaust ports 13 are located in the annular space formed by the at least two stacked pressure plates. Preferably, the pressure plates include a first pressure plate 1 and a second pressure plate 8. The first pressure plate 1 and the second pressure plate 8 are stacked. In this invention, the first pressure plate 1 and the second pressure plate 8 can be made of 45# steel and have a nickel-plated surface to provide corrosion resistance and extend service life. More preferably, the thickness of the first pressure plate 1 and the second pressure plate 8 is 14mm. Finite element analysis has verified that this thickness can withstand a deformation of ≤0.1mm under a pressure of 4MPa. Preferably, the air inlets 9 and exhaust ports 13 can be connected to a high-pressure pump or a high-pressure air compressor to deliver pressure. This invention utilizes the annular space formed by the air inlet 9, exhaust port 13, test workpiece 12, first pressure plate 1, and second pressure plate 8 to transmit the pressure generated by the high-pressure pump or high-pressure air compressor to the pressure testing device. The pressure testing device presses the test workpiece 12 at both ends to perform pressure testing on the dynamic and static sealing ring products, thereby accurately ensuring that the test workpiece 12 reaches the predetermined pressure test pressure. It is suitable for testing sealing rings of different sizes. This invention has strong sealing ability, is not prone to leakage, and has low cost. The formed annular space can bear high pressure, which can meet the high-pressure testing requirements of sealing rings. At the same time, the exhaust port 13 can perform pressure relief operations, improving the safety of the device.

[0024] According to a preferred embodiment, the fixing assembly includes a central shaft located between and passing through at least two pressure plates, and a locking shaft surrounding the circumferential edges of at least two pressure plates and passing through them. The central shaft 11 and the locking shaft 7 are connected to the pressure plates by bolts to lock the at least two pressure plates. Preferably, the central shaft 11 and the locking shaft 7 can be hexagon socket head cap screws. Preferably, a first spring washer 6 is provided between the central shaft 11 and the outer surface of the second pressure plate 8. Preferably, a second spring washer 10 is provided between the locking shaft 7 and the outer surface of the second pressure plate 8. More preferably, the device can be provided with twelve locking shafts 7, evenly distributed circumferentially on the first pressure plate 1 and the second pressure plate 8. More preferably, the locking shafts 7 can be provided on the circumference at a distance of 180 mm from the center of the pressure plate. Thus, the fixing assembly of this device can evenly distribute the locking force to the first pressure plate 1 and the second pressure plate 8, avoiding the problem of uneven sealing surfaces caused by pressure plate deformation.

[0025] According to a preferred embodiment, the pressure plate has a sealing surface facing the test workpiece 12 and an outer contact surface facing away from the test workpiece 12. The test workpiece 12 is disposed on the sealing surfaces of at least two pressure plates and on the circumferential edges of the sealing surfaces of the two pressure plates. An opening is provided on the pressure plate. The central shaft 11 and the locking shaft 7 pass through the opening through the sealing surface and the outer contact surface of the pressure plate.

[0026] According to a preferred embodiment, a bushing 4 is provided on the axis between at least two pressure plates. A central shaft 11 is provided through the bushing 4. Preferably, the bushing 4 is fitted to at least two pressure plates. The bushing 4, the test workpiece 12, and the at least two pressure plates form an annular space. Preferably, the bushing 4 can be made of hard aluminum alloy. Thus, the bushing 4 can have lightweight and wear-resistant properties. More preferably, the thickness of the bushing 4 is 22.5 mm or 30.7 mm. Thus, the bushing 4 can adapt to the conventional thickness of the test workpiece 12 (the conventional thickness range of the sealing ring is 15-35 mm). This invention, through the design of the bushing 4, can adapt to sealing rings of different thicknesses (15-35 mm), saving 60% of tooling design costs.

[0027] According to a preferred embodiment, both the air inlet 9 and the exhaust port 13 are connected to the annular space. High-pressure connectors are provided at both the air inlet 9 and the exhaust port 13. These high-pressure connectors are, for example, high-pressure double-ended external thread connectors. Preferably, the diameter of the orifices of the air inlet 9 and the exhaust port 13 is set to 8 mm. Through the design of the air inlet 9, the exhaust port 13, and the annular space, this invention ensures that the device has high-pressure testing capabilities while also enabling rapid pressure release. The residual pressure release efficiency is improved by 80%, and the response time is less than 1 second, avoiding pressure accumulation that could lead to safety hazards (such as the risk of explosion).

[0028] According to a preferred embodiment, the device further includes a first sealing ring 2, which is disposed on the sealing surface of the pressure plate and attached between the test workpiece 12 and the pressure plate. At least two first sealing rings 2 are respectively attached to the sealing surfaces of at least two pressure plates to form a first sealing surface of an annular space. The first sealing ring 2 is used for outer ring sealing of the device. Preferably, the diameter of the first sealing ring 2 is between 190mm and 300mm. Thus, the device can improve the sealing coverage range by a limited extent by increasing the coverage area by 30% through the first sealing surface formed by the outer ring sealing of the first sealing ring 2.

[0029] According to a preferred embodiment, the device further includes a second sealing ring 3, which is attached to the sealing surface of the pressure plate. At least two second sealing rings 3 are arranged to pass through the space between the first sealing ring 2 and the exhaust port 13, and through the space between the first sealing ring 2 and the air inlet 9, to form a second sealing surface. The second sealing ring 3 is used for the middle ring sealing of the device. Preferably, the diameter of the second sealing ring 3 is between 168mm and 190mm. Thus, the device fills the gap between the pressure plate and the test workpiece 12 or bushing 44 through the second sealing surface formed by the middle ring sealing of the second sealing ring 2.

[0030] According to a preferred embodiment, when the test workpiece 12 is located between at least two pressure plates, the first sealing ring 2 and the second sealing ring 3 are disposed between the test workpiece 12 and the pressure plates and locked by the locking shaft 7, so that the pressure plates seal the test workpiece 12 in the form of multi-stage sealing surfaces. The end-face sealing method of this invention results in a large sealing area and a stronger sealing effect, ensuring that the test workpiece 12 located in the device is flat under pressure, thus improving the efficiency and accuracy of the pressure test.

[0031] According to a preferred embodiment, the device further includes a third sealing ring 5, which is attached between the sealing surface of the pressure plate and the bushing 4. The third sealing ring 5 is used for inner ring sealing of the device. Preferably, the diameter of the third sealing ring 5 is between 25mm and 48mm. Thus, the device uses the inner ring sealing of the third sealing ring 5 as a double redundancy design to complement the middle ring sealing, in order to prevent micro-leakage. In this invention, the first sealing ring 2, the second sealing ring 3, and the third sealing ring 5 can be made of fluororubber to give them the effects of high temperature resistance, high pressure resistance, and an elastic modulus ≥8MPa.

[0032] The multi-stage sealing structure of this invention reduces the leakage rate during pressure testing from 5% in traditional tooling to 0.3%. The redundant sealing structure increases the maximum pressure tested by the device from 2MPa to 4MPa. The synergistic effect of multiple sealing rings increases the sealing coverage area to 1.5 times that of traditional designs. The design of the air inlet 9 and exhaust port 13 ensures rapid response during pressure boosting and depressurization, reducing safety risks.

[0033] To further illustrate the working principle of this utility model, two test cases are given below:

[0034] 1. The thickness of the sealing ring (the workpiece to be tested, 12) is set to 20mm, and the operator uses a 30.7mm bushing 4. Testing process: Input pressure 4MPa, hold pressure for 5 minutes, leakage rate is measured at 0.2mL / min (traditional fixtures measure 8mL / min). Results: The sealing ring is uniformly compressed and shows no deformation, meeting the high-pressure test requirements.

[0035] 2. The thickness of the sealing ring (the workpiece 12 to be tested) is set to 28mm. The operator uses a 22.5mm bushing 4 and adjusts the torque of the central shaft 11 and locking shaft 7 to 25N·m (ensuring uniform force on the pressure plate). Testing process: Input pressure 3.5MPa, hold pressure for 10 minutes, leakage rate is 0.3mL / min. Results: Pressure relief port response time is 0.8 seconds, pressure is completely released, and operation is safe.

[0036] Throughout the text, the features indicated by “preferred” are only optional and should not be construed as mandatory. Therefore, the applicant reserves the right to abandon or delete the relevant preferred features at any time.

[0037] It should be noted that the specific embodiments described above are exemplary. Those skilled in the art can devise various solutions inspired by the disclosure of this utility model, and these solutions all fall within the scope of this utility model and its protection. Those skilled in the art should understand that this utility model specification and its drawings are illustrative and not intended to limit the scope of the claims. The protection scope of this utility model is defined by the claims and their equivalents.

Claims

1. A pressure testing device for a sealing ring, characterized in that, The device includes pressure plates and a fixing assembly. At least two pressure plates are stacked and connected by the fixing assembly. The workpiece to be tested (12) is clamped between the at least two stacked pressure plates. At least two pressure plates have air inlets (9) and exhaust ports (13) that penetrate the pressure plates and are staggered along the thickness direction of the pressure plates. The air inlet (9) and the exhaust outlet (13) are located in an annular space formed by at least two stacked pressure plates.

2. The pressure testing device for a sealing ring according to claim 1, characterized in that, The fixing assembly includes a central axis located between and passing through at least two of the pressure plates, and a locking axis surrounding the circumferential edges of at least two of the pressure plates and passing through at least two of the pressure plates, wherein... The central shaft (11) and the locking shaft (7) are connected to the pressure plates by bolts to lock at least two of the pressure plates.

3. The pressure testing device for a sealing ring according to claim 2, characterized in that, The pressure plate has a sealing surface facing the test workpiece (12) and an outer contact surface facing away from the test workpiece (12), wherein, The test workpiece (12) is disposed on the sealing surfaces of at least two of the pressure plates and on the circumferential edge of the sealing surfaces of the two pressure plates. The pressure plates are provided with openings, and the central shaft (11) and the locking shaft (7) pass through the openings through the sealing surfaces and the outer surfaces of the pressure plates.

4. The pressure testing device for a sealing ring according to claim 3, characterized in that, A bushing (4) is provided on the axis between at least two of the pressure plates, wherein, The central shaft (11) is arranged to pass through the bushing (4).

5. The pressure testing device for a sealing ring according to claim 4, characterized in that, The bushing (4) is fitted to at least two of the pressure plates, wherein, The bushing (4), the test workpiece (12), and at least two of the pressure plates form the annular space.

6. The pressure testing device for a sealing ring according to claim 5, characterized in that, Both the air inlet (9) and the exhaust outlet (13) are connected to the annular space, and high-pressure pipes are provided at the air inlet (9) and the exhaust outlet (13).

7. The pressure testing device for a sealing ring according to claim 6, characterized in that, It also includes a first sealing ring (2), which is disposed on the sealing surface of the pressure plate and attached between the test workpiece (12) and the pressure plate, wherein, At least two of the first sealing rings (2) are respectively attached to the sealing surfaces of at least two of the pressure plates to form the first sealing surface of the annular space.

8. The pressure testing device for a sealing ring according to claim 7, characterized in that, It also includes a second sealing ring (3), which is attached to the sealing surface of the pressure plate, wherein, At least two second sealing rings (3) are arranged to form a second sealing surface by passing through the first sealing ring (2) and the exhaust port (13) and passing through the first sealing ring (2) and the air inlet (9).

9. The pressure testing device for a sealing ring according to claim 8, characterized in that, When the test workpiece (12) is located between at least two of the pressure plates, the first sealing ring (2) and the second sealing ring (3) are disposed between the test workpiece (12) and the pressure plate and are locked by the locking shaft (7), so that the pressure plate seals the test workpiece (12) in the form of forming a multi-level sealing surface.

10. The pressure testing device for a sealing ring according to claim 9, characterized in that, It also includes a third sealing ring (5), which is attached between the sealing surface of the pressure plate and the bushing (4).

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