Airtight ring pressure test device

Abstract

The utility model discloses a kind of air-tight ring pressure test device, belong to sealing element reliability test technical field.The device is composed of pressure test chamber and air inlet and exhaust valve control assembly, and pressure test chamber includes upper die holder, middle die holder and lower die holder, the whole upper die holder is pot-shaped structure and is opened into air exhaust in ring wall, middle die holder is disc-like structure, and annular sealing groove is equipped with in upper end surface and is assembled auxiliary sealing ring, for blocking bolt hole leakage path, lower die holder is clamped air-tight ring to be measured with middle die holder by bolt, make its outer edge tightly presses upper die holder ring wall, three are formed together and enclose pressurizing test cavity.Air inlet and exhaust valve control assembly is composed of pipe joint, rubber pipe and valve block, and valve block is arranged pressure gauge, pressure sensor, booster ball valve and pressure relief ball valve, realize gas grading pressurization, pressure maintaining and pressure relief.The device can simulate the stress sealing state of air-tight ring under actual working condition, avoid non-target leakage interference, test result is accurate and reliable, suitable for different specifications air-tight ring pressure performance evaluation.

Description

Technical Field

[0001] This utility model belongs to the field of sealing component reliability testing technology, specifically relating to an airtight ring pressure resistance test device. Background Technology

[0002] Airtight rings are a type of sealing element with special geometric structures and material properties, often made of rubber, composite elastomers, or modified polymer materials. Their cross-sections are mostly annular, trapezoidal, or irregularly shaped, and their surfaces are often polished or coated to ensure stable sealing contact with mating parts under pressure. Because the working mechanism of airtight rings relies on the elastic deformation and geometric self-tightening of the material, their sealing performance is highly susceptible to pressure gradients, temperature changes, and interface roughness. Especially in high-pressure gas environments, the cross-section of the airtight ring can undergo nonlinear deformation, and localized stress concentration may cause the sealing surface to warp or leak, significantly reducing the sealing effect.

[0003] Existing testing methods typically utilize simple hydrostatic fixtures or standard hydraulic test benches to verify the pressure resistance of sealing rings. However, these devices have significant limitations in addressing the unique structural characteristics of airtight rings. Firstly, most devices only consider the sealing of the entire cavity, failing to simulate the minute leakage paths caused by structural cross-sectional deformation under actual operating conditions. Secondly, traditional tests primarily rely on constant pressure loading, which cannot reflect the true failure modes of airtight rings under dynamic pressure increases or alternating pressure. Furthermore, some devices lack redundant monitoring and safety protection, making it difficult to promptly capture transient leakage signals caused by localized damage to the airtight ring.

[0004] As the application scenarios of airtight rings expand, their cross-sectional designs are becoming increasingly complex, such as irregular structures with chamfers, support ribs, or composite inserts. These structures place higher demands on the cavity sealing, loading methods, and monitoring accuracy of the testing device. Therefore, existing technologies are insufficient to comprehensively and reliably evaluate the pressure resistance performance of airtight rings, and there is an urgent need for a testing device and method that can perform targeted testing based on the structural characteristics of airtight rings. Summary of the Invention

[0005] This invention provides a pressure resistance test device for an airtight ring, which solves the problem in the prior art that the sealing failure mechanism is difficult to simulate and accurately evaluate due to the special structure of the airtight ring.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] This utility model provides an airtight ring pressure resistance test device, including a pressure test chamber and an inlet and outlet valve control assembly;

[0008] The pressure testing chamber includes an upper mold base, a middle mold base, and a lower mold base;

[0009] The upper mold base is generally basin-shaped, including an integrally formed ring wall and top wall, and several first bolt holes are opened on the top.

[0010] The intermediate mold base is disposed inside the upper mold base. The intermediate mold base has a disc-shaped structure, and its outer diameter is smaller than the inner diameter of the upper mold base. An annular sealing groove is provided around the upper end face of the intermediate mold base, and an auxiliary sealing ring is provided in the sealing groove. Several first countersunk holes corresponding to the first bolt holes are provided on the upper end face of the intermediate mold base. The upper mold base and the intermediate mold base are detachably connected by first bolts provided in the first bolt holes and the first countersunk holes. Several second countersunk holes are provided on the lower end face of the intermediate mold base.

[0011] The lower mold base is a disc-shaped structure. The lower mold base is provided with a plurality of first bolt holes corresponding to the second countersunk hole. The airtight ring to be tested is clamped between the lower mold base and the middle mold base and is pressed by the second bolts provided in the second bolt holes and the second countersunk hole.

[0012] The outer edge of the airtight ring to be tested is pressed tightly against the ring wall of the upper mold base, and the airtight ring to be tested, the upper mold base, and the middle mold base enclose each other to form a pressure test chamber;

[0013] An air inlet and exhaust port is provided on the annular wall of the pressurized test chamber; the air inlet and exhaust port is connected to the air inlet and exhaust valve control assembly.

[0014] Furthermore, the intake and exhaust valve control assembly includes a first pipe joint, a rubber hose, a second pipe joint, and a valve block connected in sequence; a pressure gauge and a pressure sensor are provided at the upper end of the valve block, a booster ball valve is connected to the outer end of the valve block, the booster ball valve is connected to an external air source through an intake pipe joint, and a pressure relief ball valve is connected to the lower end of the valve block.

[0015] Furthermore, the upper mold base, middle mold base, and lower mold base are coaxially arranged, and the first bolt and the second bolt are distributed at equal intervals along the circumference.

[0016] Furthermore, the annular sealing groove has a rectangular cross-section, and the edges of the annular sealing groove are provided with rounded corners.

[0017] Furthermore, the valve block is provided with interconnected cross-shaped through channels; the two ends of the first channel in the horizontal direction are respectively connected to the hose and the pressure boosting ball valve; the upper end of the second channel in the vertical direction is connected to the pressure gauge and the pressure sensor, and the lower end is connected to the pressure relief ball valve.

[0018] Furthermore, both the first and second bolts are countersunk head hex bolts, and both are equipped with metal washers.

[0019] Furthermore, the airtight ring to be tested is an overall ring structure, with several toothed structures evenly arranged along the inner circumference, and the toothed structures are provided with fixing holes for the second bolt to pass through.

[0020] Furthermore, the hose is a pressure-resistant flexible hose, and both ends of the hose are fixedly connected to the first pipe joint and the second pipe joint by threads. The threaded connection between the hose and the first pipe joint and the second pipe joint is coated with thread sealant or wrapped with polytetrafluoroethylene sealing tape.

[0021] Furthermore, the upper end of the intermediate mold base is provided with an annular step, and the pressure test chamber formed thereby is an annular cavity with an inverted L-shaped axial cross section.

[0022] Furthermore, the pressure sensor is an electronic pressure transmitter with a range of 0-10 MPa and an accuracy of not less than 0.25% FS.

[0023] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0024] This invention features a pressure testing chamber formed by an upper mold base, a middle mold base, and a lower mold base. This chamber allows the airtight ring to be clamped and pressurized under near-realistic working conditions. Its outer edge is tightly pressed against the ring wall of the upper mold base, effectively simulating the sealing state of the airtight ring under high-pressure gas. The upper surface of the middle mold base is provided with an annular sealing groove and equipped with an auxiliary sealing ring to prevent gas leakage along the bolt holes, thereby ensuring the airtightness of the test chamber and the stability of the pressure environment. The lower mold base and the middle mold base clamp the airtight ring to be tested with bolts, ensuring uniform force on the ring during loading and avoiding distortion results caused by bias pressure or local warping.

[0025] This utility model's intake and exhaust valve control assembly employs a valve block that centrally arranges pressure gauges, pressure sensors, booster ball valves, and relief ball valves. This not only enables graded pressurization, maintenance, and release of gas pressure within the test chamber but also facilitates real-time monitoring of the failure characteristics of the airtight ring, ensuring the accuracy and safety of test data. The overall device features a compact structure and a reasonable sealing redundancy design, capable of simulating the pressure resistance conditions of the airtight ring under different pressure gradients and loading modes. This enhances the relevance and reliability of the test, thus providing effective support for the design optimization and application evaluation of airtight rings.

[0026] Of course, implementing the various technical solutions of this utility model does not necessarily require achieving all of the advantages described above at the same time. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other embodiments can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0029] Figure 2 This is a top view of the pressure testing chamber according to an embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of the upper mold base in an embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of the structure of the mold base in an embodiment of this utility model;

[0032] Figure 5 This is a schematic diagram of the structure of the lower mold base in an embodiment of this utility model;

[0033] Figure 6 This is a schematic diagram of the structure of the airtight ring to be tested in an embodiment of this utility model.

[0034] In the diagram, 1-upper mold base, 2-middle mold base, 3-airtight ring to be tested, 4-lower mold base, 5-sealing groove, 6-first bolt, 7-second bolt, 8-pressure test chamber, 9-air inlet and outlet, 10-first pipe connector, 11-rubber hose, 12-second pipe connector, 13-valve block, 14-pressure gauge, 15-pressure sensor, 16-pressure booster ball valve, 17-pressure relief ball valve, 18-air inlet pipe connector, 19-auxiliary sealing ring. Detailed Implementation

[0035] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0036] In the description of this patent, it should be understood that the terms “center,” “upper,” “lower,” “front,” “back,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this patent and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this patent.

[0037] In the description of this patent, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this patent according to the specific circumstances. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0038] Example:

[0039] like Figures 1-6 The airtight ring pressure resistance test device shown in this embodiment consists of a pressure test chamber and an inlet / outlet valve control assembly. The pressure test chamber adopts a coaxial clamping structure of upper mold base 1, middle mold base 2 and lower mold base 4. The upper mold base 1 is generally basin-shaped and is composed of an integrally formed ring wall and top wall. The top wall is provided with first bolt holes at equal intervals around its circumference, and an air inlet / outlet port 9 is opened on the ring wall of the upper mold base. The middle mold base 2 is a disc-shaped component with an outer diameter slightly smaller than the inner diameter of the annular wall of the upper mold base 1 to achieve limiting assembly. The upper end face of the mold base 2 is provided with an annular sealing groove 5. The sealing groove 5 has a rectangular cross-section and rounded corners at the edges. An auxiliary sealing ring 19 is installed in the groove to independently seal the area of ​​the first bolt holes. The upper end face of the middle mold base 2 is provided with several first countersunk holes corresponding to the first bolt holes, and the lower end face is provided with several second countersunk holes. An annular step matching the annular wall of the upper mold base 1 can be formed on the outer periphery, so that the pressure test chamber 8 after assembly has an inverted L-shape in the axial section (see...). Figure 4 The lower mold base 4 is a disc-shaped, thick-walled pressure-bearing component. Second bolt holes, corresponding to the second countersunk holes, are evenly spaced around its circumference. Preferably, an annular step or a clamping plane is provided on the outer edge of its upper surface to facilitate axial positioning and force transmission of the airtight ring 3 to be tested. (See [reference]). Figure 5 .

[0040] like Figure 6As shown, the airtight ring 3 to be tested is an annular component. The inner ring has a toothed structure evenly arranged circumferentially and a fixing hole, which facilitates the passage and clamping of the second bolt 7. During assembly, the airtight ring 3 to be tested is located between the middle mold base 2 and the lower mold base 4. After the second bolt 7 is tightened diagonally in stages, the ring body is evenly clamped in the axial direction. Under the combined action of internal pressure and structural limit, the outer edge of the airtight ring 3 to be tested is reliably pressed against the ring wall of the upper mold base 1. The airtight ring 3 to be tested, together with the upper mold base 1 and the middle mold base 2, forms an annular pressure test chamber 8. To avoid leakage caused by non-target channels, the auxiliary sealing ring 19 is specially used to block the potential leakage path in the connection area between the upper mold base 1 and the middle mold base 2, so that the chamber pressure mainly acts on the interface between the airtight ring 3 to be tested and the three mold bases, thereby improving the stability and repeatability of the results.

[0041] The piping of the intake and exhaust valve control assembly connects to the valve block 13 sequentially from the intake and exhaust ports 9 via the first pipe connector 10, the rubber hose 11, and the second pipe connector 12. The valve block 13 internally forms interconnected cross-shaped flow channels: one end of the horizontal first flow channel connects to the rubber hose 11, and the other end connects to the booster ball valve 16 and connects to an external air source via the intake pipe connector 18; a pressure gauge 14 and a pressure sensor 15 are installed at the upper end of the vertical second flow channel. The pressure sensor is an electronic pressure transmitter with a range of 10 MPa and an accuracy of 0.25% FS. The lower end of the valve block 13 is connected to a pressure relief ball valve 17. (See [reference]). Figure 1 The hose 11 is a pressure-resistant flexible hose, with both ends fixedly connected to the first pipe connector 10 and the second pipe connector 12 via threads. Thread sealant is applied to the threads or polytetrafluoroethylene (PTFE) sealing tape is wrapped around them to improve the sealing reliability of the connection and enhance vibration resistance. To ensure pressure resistance and coaxial accuracy, the first bolt 6 and the second bolt 7 are countersunk hexagonal bolts with metal washers. The three main mold bases are coaxially arranged, and the bolts are evenly spaced along the circumference. During assembly, pre-tightening is performed diagonally and in stages to obtain uniform clamping force and stable concentricity.

[0042] The working principle of this embodiment is to establish a composite pressure field with both axial and radial forces using an inverted L-shaped annular cavity 8: the axial pressure difference causes the airtight ring 3 under test to form a stable end-face contact with the middle mold base 2 and the lower mold base 4 and be reliably clamped; the radial pressure difference causes the outer edge of the airtight ring 3 under test to press against the annular wall of the upper mold base 1, and the sealing and fitting path under the combined action of the three forces is closer to the actual working conditions. At the same time, the auxiliary sealing ring 19 isolates the leakage channel of the first bolt hole, so that the measured pressure response mainly reflects the contribution of the structure and surface condition of the airtight ring 3 under test to the sealing performance, thereby improving the pertinence and effectiveness of the evaluation.

[0043] This embodiment describes a test method for an airtight ring pressure resistance test device, the steps of which are as follows:

[0044] First, the middle mold base 2 is inserted into the inner side of the annular wall of the upper mold base 1, ensuring its outer edge aligns with the limiting surface of the upper mold base 1. Then, the upper mold base 1 and the middle mold base 2 are detachably connected using the first bolt 6. During tightening, a diagonal, graded pre-tightening method is used to ensure uniform force distribution. Simultaneously, auxiliary sealing rings 19 are evenly placed within the annular sealing groove 5 of the middle mold base 2, forming a reliable seal with the top wall of the upper mold base 1 to block gas leakage along the first bolt holes.

[0045] The second step is to place the airtight ring 3 to be tested in the clamping position between the middle mold base 2 and the lower mold base 4. The fixing hole of the airtight ring 3 to be tested needs to be coaxially aligned with the second bolt hole on the lower mold base 4 and the second countersunk hole on the middle mold base 2 to ensure stable installation. Then, close the lower mold base 4 so that it fits tightly against the middle mold base 2, and insert the second bolt 7. Tighten the bolts step by step in a diagonal sequence until the airtight ring 3 to be tested is evenly clamped in the axial direction, and its outer edge reliably presses against the ring wall of the upper mold base 1, thereby forming a pressure test chamber 8 with the upper mold base 1 and the middle mold base 2.

[0046] The third step involves connecting the air intake and exhaust ports 9 sequentially to the valve block 13 via the first pipe connector 10, the rubber hose 11, and the second pipe connector 12, forming a complete air path. An external air source is connected to the booster ball valve 16 via the air intake pipe connector 18. The cross-shaped through-flow channel inside the valve block 13 ensures that the gas flows sequentially to the pressure gauge 14, the pressure sensor 15, and the pressure relief ball valve 17, thereby achieving unified control of air intake, detection, and pressure relief.

[0047] Fourth, turn on the external gas source and operate the pressure boosting ball valve 16 to introduce gas into the pressure testing chamber 8, gradually increasing the pressure in stages. The pressure increase rate should be controlled within a moderate range to avoid impact on the sample due to sudden pressure changes. After each pressure level stabilizes, maintain it for a predetermined time, using pressure gauge 14 and pressure sensor 15 to monitor and record the pressure change curve. When the highest set pressure is reached, extend the pressure holding time to observe the sealing stability and pressure resistance performance of the airtight ring 3 under high pressure.

[0048] Fifth, after the test has reached the predetermined duration, operate the pressure relief ball valve 17 to slowly release the pressure, gradually reducing the gas pressure inside the pressurized test chamber 8 to atmospheric pressure. After depressurization, loosen the second bolt 7 and the first bolt 6 in sequence, remove the lower mold base 4 and the middle mold base 2, and take out the airtight ring 3 to be tested. Finally, observe and record the end face indentation and outer edge contact marks of the airtight ring 3, and perform dimensional measurements if necessary to evaluate the sealing effect and the stress state of the material.

[0049] The working method of this embodiment is to isolate the non-target leakage channel between the upper mold base 1 and the middle mold base 2 by using the auxiliary sealing ring 19, so that the pressure of the pressurized test chamber 8 mainly acts on the sealing interface of the airtight ring 3 under test, which can truly reflect its deformation and sealing characteristics under complex pressure environment. At the same time, the cross-shaped flow channel integrated by the valve block 13 is used to realize the rapid switching of pressurization, pressure holding and pressure release, which improves the safety of the test and the reliability of the data.

[0050] The above-described specific examples are for illustrative purposes only and are not intended to limit the scope of this invention. Those skilled in the art to which this invention pertains can make various simple deductions, modifications, or substitutions based on the concept of this invention.

Claims

1. A pressure-resistant test device for an airtight ring, characterized in that, Includes pressure testing chamber and intake / exhaust valve control components; The pressure testing chamber includes an upper mold base (1), a middle mold base (2), and a lower mold base (4); The upper mold base (1) is in the shape of a basin, including an integrally formed ring wall and a top wall, with several first bolt holes opened on the top. The middle mold base (2) is disposed inside the upper mold base (1). The middle mold base (2) is a disc-shaped structure with an outer diameter smaller than the inner diameter of the upper mold base (1). An annular sealing groove (5) is provided around the upper end face of the middle mold base (2), and an auxiliary sealing ring (19) is provided inside the sealing groove (5). Several first countersunk holes corresponding to the first bolt holes are provided on the upper end face of the middle mold base (2). The upper mold base (1) and the middle mold base (2) are detachably connected by first bolts (6) provided in the first bolt holes and the first countersunk holes. Several second countersunk holes are provided on the lower end face of the middle mold base (2). The lower mold base (4) is a disc-shaped structure. The lower mold base (4) is provided with a number of first bolt holes corresponding to the second countersunk hole. The airtight ring (3) to be tested is clamped between the lower mold base (4) and the middle mold base (2) and is pressed by the second bolt (7) provided in the second bolt hole and the second countersunk hole. The outer edge of the airtight ring (3) to be tested is pressed against the ring wall of the upper mold base (1), and the airtight ring (3) to be tested, the upper mold base (1), and the middle mold base (2) enclose each other to form a pressure test chamber (8). An air inlet and exhaust port (9) is provided on the annular wall where the pressure test chamber (8) is located; the air inlet and exhaust port (9) is connected to the air inlet and exhaust valve control assembly.

2. The airtight ring pressure resistance test device according to claim 1, characterized in that, The intake and exhaust valve control assembly includes a first pipe joint (10), a hose (11), a second pipe joint (12), and a valve block (13) connected in sequence; a pressure gauge (14) and a pressure sensor (15) are installed at the upper end of the valve block (13), a booster ball valve (16) is connected to the outer end of the valve block (13), the booster ball valve (16) is connected to an external air source through an intake pipe joint (18), and a pressure relief ball valve (17) is connected to the lower end of the valve block (13).

3. The airtight ring pressure resistance test apparatus according to claim 1 or 2, characterized in that, The upper mold base (1), middle mold base (2) and lower mold base (4) are coaxially arranged, and the first bolt (6) and the second bolt (7) are distributed at equal intervals along the circumference.

4. The airtight ring pressure resistance test device according to claim 3, characterized in that, The annular sealing groove (5) has a rectangular cross section, and the edges of the annular sealing groove (5) are provided with rounded corner transitions.

5. The airtight ring pressure resistance test device according to claim 2, characterized in that, The valve block (13) has interconnected cross-shaped through channels inside; the two ends of the first channel in the horizontal direction are connected to the hose (11) and the pressure boosting ball valve (16) respectively; the upper end of the second channel in the vertical direction is connected to the pressure gauge (14) and the pressure sensor (15), and the lower end is connected to the pressure relief ball valve (17).

6. The airtight ring pressure resistance test apparatus according to claim 1, characterized in that, Both the first bolt (6) and the second bolt (7) are countersunk head hex bolts, and both the first bolt (6) and the second bolt (7) are equipped with metal washers.

7. The airtight ring pressure resistance test apparatus according to claim 1, characterized in that, The airtight ring (3) to be tested is an overall ring structure, with several toothed structures evenly arranged along the inner circumference. The toothed structures are provided with fixing holes for the second bolt (7) to pass through.

8. The airtight ring pressure resistance test device according to claim 2, characterized in that, The hose (11) is a pressure-resistant flexible hose. Both ends of the hose (11) are fixedly connected to the first pipe joint (10) and the second pipe joint (12) by threads. The threaded connection between the hose (11) and the first pipe joint (10) and the second pipe joint (12) is coated with thread sealant or wrapped with polytetrafluoroethylene sealing tape.

9. The airtight ring pressure resistance test apparatus according to claim 1, characterized in that, The upper end of the middle mold base (2) is provided with an annular step, and the pressure test chamber (8) formed thereby is an annular chamber with an inverted L-shaped axial cross section.

10. The airtight ring pressure resistance test device according to claim 2, characterized in that, The pressure sensor (15) is an electronic pressure transmitter with a range of 0-10MPa and an accuracy of not less than 0.25%FS.

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