Fluid self-sealing high pressure testing device and method of operation

Abstract

The application discloses a kind of fluid self-sealing high-pressure testing device and operating method, it is related to high-pressure testing device technical field, fluid self-sealing high-pressure testing device includes: base, at least two cavity seats are provided on base;The outer circumferential side of cavity seat is spaced apart and is provided with sealing flow channel interface and test flow channel interface along its length direction, and sealing pressure chamber is arranged inside, piston rod is slidably arranged in sealing pressure chamber, piston rod includes: integrally formed cooperation section, flow channel section and sealing section;The outer side wall of cooperation section is slidably connected with the inner side wall of sealing pressure chamber, and test cavity is arranged between flow channel section and the inner side wall of sealing pressure chamber and is communicated with test flow channel interface;The end of sealing section is provided with first sealing surface, and inner flow channel is opened in sealing section.The above-mentioned fluid self-sealing high-pressure testing device solves the technical problems that the operation time of existing high-pressure fluid component test scheme is longer, the efficiency is extremely low when batch testing, and it is difficult to adapt to the fast-paced detection needs of production line.

Description

Technical Field

[0001] This invention relates to the field of high-pressure testing equipment technology, and in particular to a fluid self-sealing high-pressure testing device and its operating method. Background Technology

[0002] In high-pressure fluid systems such as hydraulics, aerospace, and petrochemicals, high-pressure needle valves, ball valves, relief valves, check valves, and various conversion joints are core control / connection components. Their sealing performance and pressure resistance directly determine the operational safety and reliability of the entire system. Therefore, these components must undergo high-pressure testing before leaving the factory or during maintenance to verify whether they meet design requirements. The testing mainly includes shell pressure resistance testing, valve core sealing testing, interface sealing testing, and fluid flow reliability testing.

[0003] However, existing testing methods for high-pressure fluid components employ a method of tightening pipelines one joint at a time. For the multi-interface structures of different components, each test requires tightening at least two high-pressure connectors individually, and each high-pressure connector must be tightened with a sealing gasket, resulting in a lengthy operation time. For adapters, due to the diverse interface specifications, frequent replacement of adapters is necessary, further extending the operation time. This leads to a long pipeline connection time for testing a single component, resulting in extremely low efficiency during batch testing and making it difficult to adapt to the fast-paced testing requirements of production lines. Furthermore, the tightening force during connector assembly and disassembly is difficult to precisely control. The sealing surfaces (such as conical, flat, and threaded seals) between the connector and the component interface are prone to scratches and indentations due to repeated friction and compression, leading to a decrease in sealing performance. Existing technologies also disclose methods that apply external force through bolt tightening or hydraulic clamping to force the seal to adhere to the component interface. However, in practical applications, the clamping force cannot be adaptively adjusted, easily leading to insufficient clamping force causing leakage or excessive clamping force damaging the component. Therefore, this paper proposes a fluid self-sealing high-pressure testing device and operating method to address the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide a fluid self-sealing high-pressure testing device and operating method, which solves the technical problems of existing high-pressure fluid component testing schemes having long operation time, extremely low efficiency in batch testing, and difficulty in adapting to the fast-paced testing needs of production lines.

[0005] To achieve the above objectives, the present invention provides a fluid self-sealing high-pressure testing device, comprising: A base, wherein at least two cavity seats are provided on the base, and a docking groove for placing the test piece is provided between the adjacent ends of the at least two cavity seats; The outer peripheral side of the cavity seat is provided with a sealing flow channel interface and a test flow channel interface at intervals along its length. A sealing pressure chamber is provided inside, and the end of the sealing pressure chamber away from the docking groove is connected to the sealing flow channel interface. A piston rod is slidably disposed within the sealed pressure chamber. The piston rod includes an integrally formed mating section, a flow channel section, and a sealing section. The outer wall of the mating section is slidably connected to the inner wall of the sealed pressure chamber. A test cavity communicating with the test flow channel interface is provided between the flow channel section and the inner wall of the sealed pressure chamber. The end of the sealing section is provided with a first sealing surface that fits against the mating surface of the test piece, and an inner flow channel is opened in the sealing section. One end of the inner flow channel is connected to the test cavity, and the other end extends to the first sealing surface and is connected to the internal flow channel of the test piece.

[0006] Preferably, the outer peripheral side of the cavity seat is provided with a reset flow channel interface, the reset flow channel interface is located between the sealing flow channel interface and the test flow channel interface, the sealing pressure chamber is provided with an annular step at the position of the reset flow channel interface, and the end of the mating section away from the flow channel section is integrally formed with a stop part, the stop part and the annular step surround to form a reset pressure chamber, and the reset pressure chamber is connected to the reset flow channel interface.

[0007] Preferably, the flow channel section is provided with one or more through holes, which extend radially along the sealing section and connect the test cavity and the inner flow channel.

[0008] Preferably, the end of the sealing pressure chamber away from the docking groove passes through the cavity seat and is provided with a sealing tail plug for sealing the sealing pressure chamber.

[0009] Preferably, the outer peripheral side of the stop portion is provided with a first annular groove, and a first sealing ring is sleeved in the first annular groove, with the outer peripheral side of the first sealing ring conforming to the inner wall of the sealing pressure chamber.

[0010] Preferably, the outer peripheral side of the mating section near the flow channel section is provided with a second annular groove, and a second sealing ring is sleeved in the second annular groove, with the outer peripheral side of the second sealing ring fitting against the inner wall of the sealing pressure chamber.

[0011] Preferably, the outer peripheral side of the sealing section near the flow channel section is provided with a third annular groove, and a third sealing ring is sleeved in the third annular groove, with the outer peripheral side of the third sealing ring fitting against the inner wall of the sealing pressure chamber.

[0012] Preferably, the first sealing surface is cone-shaped and adapted to the mating surface. The first sealing surface is provided with a fourth annular groove, in which a fourth sealing ring is embedded. The outer peripheral side of the fourth sealing ring is in contact with the mating surface.

[0013] Accordingly, the technical solution of the present invention also provides an operation method for a fluid self-sealing high-pressure testing device, applicable to any of the fluid self-sealing high-pressure testing devices described above, the operation method comprising: The test piece is placed directly in the mating groove, so that the sealing pressure chamber is coaxially aligned with the mating interface of the test piece. The fluid medium is controlled to enter the sealing pressure chamber through the sealing flow channel interface. The fluid medium acts positively on the piston rod, pushing the piston rod to move axially, so that the first sealing surface is in contact with the mating surface. After the inner flow channel and the inner flow channel of the test piece are sealed and connected, the control fluid medium is sequentially passed through the test flow channel interface, the test cavity, and the inner flow channel into the inner flow channel of the test piece, and the test data of the test piece is collected to complete the pressure test of the test piece.

[0014] Preferably, the sealing flow channel interface and the test flow channel interface are respectively connected to the same external pressure source through a high-pressure connector, and the end face of the piston rod away from the mating groove is larger than the radial cross-section of the sealing section, so that the positive force of the fluid medium acting on the piston rod is greater than the negative force of the fluid medium acting on the piston rod. As the pressure of the fluid medium increases, the sealing force of the fluid medium acting on the piston rod increases, so as to achieve self-sealing between the first sealing surface and the mating surface.

[0015] Compared with the above-mentioned background technology, the fluid self-sealing high-pressure testing device provided by the present invention has the following beneficial effects: (1) In this invention, at least two cavity seats are set on the base, and the test piece is placed directly in the docking groove, so that the sealing pressure chamber and the docking interface of the test piece are coaxially aligned. The fluid medium is controlled to enter the sealing pressure chamber through the sealing flow channel interface. The fluid medium acts positively on the piston rod, pushing the piston rod to move axially until the first sealing surface and the docking surface are in contact, so as to complete the initial sealing docking. The test piece and the test device only need to be positioned and docked once, without the need to tighten the pipeline one by one. This eliminates the most time-consuming disassembly and assembly step in the traditional solution, reduces the installation time of the test piece, and improves the test efficiency. On the other hand, the sealing docking of the test device and the test piece is completed by the first sealing surface of the piston rod being in contact with the docking surface of the test piece. Even with various interface specifications of the conversion connector, it is not necessary to frequently change the adapter connector, thereby reducing the pipeline connection time between the test piece and the test device, further improving the test efficiency, so as to meet the fast-paced testing needs of the production line, and at the same time improving the equipment versatility and ease of operation. Furthermore, the testing device and the test piece only have static contact in axial contact, without any relative rotational friction, eliminating the problems of scratches and indentations that easily occur with threaded connections. The operating method of the fluid self-sealing high-pressure testing device used in this invention also possesses the above-mentioned beneficial effects.

[0016] (2) In this invention, the fluid medium enters the sealed pressure chamber through the sealed flow channel interface and acts positively on the piston rod, so that the inner flow channel and the inner flow channel of the test piece are sealed together. Moreover, as the pressure of the fluid medium entering the inner flow channel increases, the sealing force of the fluid medium entering the sealed pressure chamber acting positively on the piston rod increases synchronously, so as to adaptively adjust the clamping force, taking into account both high and low pressure test requirements, and achieving high pressure self-sealing without the need to apply additional external force; and there is no technical problem of insufficient clamping force leading to leakage or excessive clamping force damaging the parts. The operation method of the fluid self-sealing high pressure test device used in this invention also has the above-mentioned beneficial effects. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0018] Figure 1 This is a side view of the testing apparatus provided in an embodiment of the present invention; Figure 2 for Figure 1 A schematic cross-sectional view of the first embodiment at point AA; Figure 3 for Figure 1 Cross-sectional schematic diagram of the second embodiment at point AA; Figure 4 This is a cross-sectional schematic diagram of the piston rod provided in an embodiment of the present invention; Figure 5 for Figure 2 Enlarged view of point B in the middle; Figure 6 for Figure 2 Enlarged diagram of point C in the middle.

[0019] Specifically, 1-base; 2-cavity seat; 201-sealed flow channel interface; 202-reset flow channel interface; 203-test flow channel interface; 204-sealed pressure chamber; 2041-annular step; 3-butting groove; 4-piston rod; 401-fitting section; 4011-second annular groove; 402-flow channel section; 4021-through hole; 4022-test cavity; 403-sealing section; 4031-inner flow channel; 4032-third annular groove; 4033-first sealing surface; 4034-fourth annular groove; 404-stop part; 4041-first annular groove; 5-sealing tail plug; 6-first sealing ring; 7-second sealing ring; 8-third sealing ring; 9-fourth sealing ring; 10-sealing gasket; 11-test piece; 1101-internal flow channel; 1102-butting interface; 1103-butting surface; 12-elastic element. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] like Figure 1 , Figure 2 and Figure 6 As shown, to achieve the above objectives, the present invention provides a fluid self-sealing high-pressure testing device, comprising: a base 1 and at least two cavity seats 2 disposed on the base 1, wherein a docking groove 3 is provided between adjacent ends of the at least two cavity seats 2, the docking groove 3 being used to place the test piece 11. In this application, two cavity seats 2 are specifically disposed on the base 1, and the test piece 11 is illustrated by taking a high-pressure needle valve, ball valve, overflow valve, and check valve as examples.

[0023] The outer periphery of the cavity seat 2 is provided with a sealing flow channel interface 201 and a test flow channel interface 203 at intervals along its length. A sealing pressure chamber 204 is provided inside the cavity seat 2, extending along the length of the cavity seat 2. The end of the sealing pressure chamber 204 away from the docking groove 3 is connected to the sealing flow channel interface 201. A piston rod 4 is slidably arranged inside the sealing pressure chamber 204. The piston rod 4 includes an integrally formed mating section 401, a flow channel section 402, and a sealing section 403. The outer side wall of the mating section 401 is slidably connected to the inner side wall of the sealing pressure chamber 204. A test cavity 4022 is provided between the flow channel section 402 and the inner side wall of the sealing pressure chamber 204, which is connected to the test flow channel interface 203. Preferably, the test cavity 4022 is a closed ring shape arranged around the flow channel section 402. At the same time, the outer wall of the mating section 401 and the inner wall of the sealing pressure chamber 204 are tightly slidably fitted, so that the fluid medium in the test flow channel interface 203 and the test cavity 4022 will not leak. The end of the sealing section 403 is provided with a first sealing surface 4033 that fits against the mating surface 1103 of the test piece 11, and an inner flow channel 4031 is opened in the sealing section 403. One end of the inner flow channel 4031 is connected to the test cavity 4022, and the other end extends to the first sealing surface 4033 and is connected to the inner flow channel 1101 of the test piece 11. By placing two cavity seats 2 on the base 1, the test piece 11 is directly placed in the docking groove 3, making the sealing pressure chamber coaxially aligned with the docking interface 1102 of the test piece 11. The docking interface 1102 is located at the end of the internal flow channel 1101. The control fluid medium enters the sealing pressure chamber 204 through the sealing flow channel interface 201. The fluid medium acts positively on the piston rod 4, pushing the piston rod 4 to move axially until the first sealing surface 4033 is in contact with the docking surface 1103 to complete the initial sealing docking. The test piece 11 and the testing device only need to be positioned and docked once, without having to screw on each pipe individually. This eliminates the most time-consuming disassembly and assembly step in the traditional solution, reducing the installation time of the test piece 11 and improving testing efficiency. The fluid medium can be a liquid such as water or a gas such as air. This application uses water as an example for illustration.

[0024] It should be noted that the sealing connection between the testing device and the test piece 11 is completed by the first sealing surface 4033 of the piston rod 4 fitting with the mating surface 1103 of the test piece 11. Even with various interface specifications of the adapter, there is no need to frequently change the adapter, thereby reducing the pipeline connection time between the test piece 11 and the testing device, further improving testing efficiency to meet the fast-paced testing needs of the production line, and improving the equipment's versatility and ease of operation. Moreover, the testing device and the test piece 11 only have static contact with axial fitting, without any relative rotational friction, eliminating the problems of scratches and indentations that are prone to occur with threaded connections.

[0025] It should be further explained that the fluid medium enters the sealed pressure chamber 204 through the sealed flow channel interface 201 and acts positively on the piston rod 4, so that the inner flow channel 4031 and the inner flow channel 1101 of the test piece 11 are sealed together. Moreover, as the pressure of the fluid medium entering the inner flow channel 1101 increases, the sealing force of the fluid medium entering the sealed pressure chamber 204 acting positively on the piston rod 4 increases synchronously, so as to adaptively adjust the clamping force, taking into account both high and low pressure test requirements. High pressure self-sealing can be achieved without applying additional external force; and there will be no technical problems such as insufficient clamping force leading to leakage or excessive clamping force damaging the parts. While ensuring the reliability of test data, the protection effect of the test piece 11 is improved.

[0026] In some embodiments of the present invention, a reset flow channel interface 202 is provided on the outer peripheral side of the cavity seat 2. The reset flow channel interface 202 is located between the sealing flow channel interface 201 and the test flow channel interface 203. That is, the outer periphery of each cavity seat 2 is provided with a sealing flow channel interface 201, a reset flow channel interface 202 and a test flow channel interface 203 at intervals along its length. The sealing pressure chamber 204 is provided with an annular step 2041 at the position of the reset flow channel interface 202. Figure 3 As shown, taking the cavity seat 2 located on the left side of the base 1 as an example, the inner diameter of the sealing pressure cavity 204 on the left side of the annular step 2041 is larger than the inner diameter of the sealing pressure cavity 204 on the right side of the annular step 2041. The end of the mating section 401 away from the flow channel section 402 is integrally formed with a stop part 404. The annular step 2041 and the stop part 404 at the left end of the piston rod 4 enclose and form a reset pressure cavity that communicates with the reset flow channel interface 202. After the test is completed, the pressure in the test cavity 4022 is first released through the test flow channel interface 203, and then the pressure in the sealed pressure chamber 204 is released through the sealed flow channel interface 201. After the pressure is released, the external pressure source introduces fluid medium into the reset pressure chamber through the reset flow channel interface 202 to push the piston rod 4 back to the initial position in the sealed pressure chamber 204, thereby releasing the sealing connection with the test piece. After the reset is completed, the pressure in the reset pressure chamber is released, and the test piece 11 can be removed from the docking groove 3, realizing the rapid loosening and removal of the test piece 11, and further improving the overall efficiency of the test process.

[0027] In some embodiments of the present invention, the flow channel section 402 is provided with one or more through holes 4021. Optionally, two through holes 4021 are provided in the flow channel section 402. One end of the two through holes 4021 is connected to the test cavity 4022, and the other end is connected to the inner flow channel 4031 of the sealing section 403. This allows the test flow channel interface 203, the test cavity 4022, the through holes 4021, and the inner flow channel 4031 to form a continuous and interconnected test flow path. This allows the fluid medium to flow smoothly and stably into the internal flow channel 1101 of the test piece 11, ensuring the normal operation of the test. At the same time, the provision of two through holes 4021 can increase the flow area while ensuring the structural strength of the piston rod 4, meeting the high-pressure test requirements of large flow rate and fast response, making the liquid supply in the internal flow channel 1101 more uniform, and further improving the stability and accuracy of the test data.

[0028] In some embodiments of the present invention, the end of the sealing pressure chamber 204 away from the docking groove 3 penetrates through the cavity seat 2 and is provided with a sealing tail plug 5 for sealing the sealing pressure chamber 204. The sealing tail plug 5 forms a reliable sealing fit with the cavity seat 2 and the sealing pressure chamber 204 to seal the end of the sealing pressure chamber 204, so that the fluid medium introduced through it acts stably on the piston rod 4 to provide axial sealing thrust. Moreover, the sealing tail plug 5 can prevent high-pressure fluid from leaking out from the rear end of the cavity seat 2, further improving the sealing safety of the overall device under high-pressure testing conditions. At the same time, the setting of the sealing tail plug 5 facilitates the installation of the piston rod 4 into the sealing pressure chamber 204 during assembly, realizing the rapid pre-assembly and positioning of the piston rod 4. It simplifies the processing and assembly process of the cavity seat 2 and the piston rod 4, and allows for quick inspection and cleaning of the piston rod 4 and the interior of the sealing pressure chamber 204 by disassembling the sealing tail plug 5 during later maintenance, improving the maintenance convenience of the overall testing device.

[0029] The end of the sealing plug 5 has a conical surface, which fits against the inner wall conical surface of the cavity seat 2 at the corresponding position to form a primary hard seal, preventing fluid medium leakage from the sealed pressure cavity 204 under high pressure conditions. Furthermore, for larger-sized test scenarios with a conical surface diameter of not less than 20mm, a sealing gasket 10 is added at the junction of the conical surface of the sealing plug 5 and the inner wall conical surface of the cavity seat 2 at the corresponding position. This gasket, in conjunction with the primary hard seal, forms a secondary soft seal, further improving the overall sealing reliability of the sealed pressure cavity 204 under large-diameter conditions through these two sealing methods. The sealing gasket 10 is preferably made of plastic to ensure good deformation sealing effect and improve stable sealing performance under high pressure.

[0030] like Figure 4As shown, in another embodiment of the present invention, taking the cavity seat 2 located on the left side of the base 1 as an example, an elastic element 12 is provided on the left end face of the stop part 404, and the other end of the elastic element 12 is connected to the sealing tail plug 5. At this time, it is not necessary to set the reset flow channel interface 202 and the reset pressure chamber. After the test is completed, the pressure in the test cavity 4022 is first released through the test flow channel interface 203, and then the pressure in the sealing pressure chamber 204 is released through the sealing flow channel interface 201. After the pressure is released, under the pulling force of the elastic element 12, the piston rod 4 retracts back to the initial position in the sealing pressure chamber 204, releasing the sealing connection with the test piece, and removing the test piece 11 from the docking groove 3, realizing the rapid loosening and removal of the test piece 11, and further improving the overall work efficiency of the test process.

[0031] In some embodiments of the present invention, the outer peripheral side of the stop portion 404 is provided with a first annular groove 4041, and a first sealing ring 6 is sleeved inside the first annular groove 4041. Optionally, the first sealing ring 6 is made of rubber material, and the size of the first sealing ring 6 is adapted to the first annular groove 4041. The first sealing ring 6 is tightly sleeved inside the first annular groove 4041, and the outer peripheral side of the first sealing ring 6 is tightly fitted and seamlessly connected with the inner sidewall of the sealing pressure chamber 204 to form a reliable circumferential sealing structure. This isolates the fluid medium of the reset pressure chamber and the sealing pressure chamber 204, prevents the two fluid media with different functions from leaking into each other, and ensures that the sealing pressure chamber 204 and the reset pressure chamber can stably withstand the corresponding fluid medium pressure. This makes the axial movement of the piston rod 4 under the action of the fluid medium precise and controllable, and avoids insufficient sealing force or reset force due to medium leakage, which would affect the reliability of the sealing connection and the smoothness of the reset action. Meanwhile, the first annular groove 4041 can limit the first sealing ring 6, preventing the first sealing ring 6 from shifting due to the reciprocating movement of the piston rod 4 and fluctuations in fluid pressure during the test, thereby improving the reliability of the sealing performance of the first sealing ring 6 and avoiding the impact of media leakage on test accuracy.

[0032] In some embodiments of the present invention, a second annular groove 4011 is provided on the outer peripheral side of the mating section 401 near the flow channel section 402. A second sealing ring 7 is sleeved inside the second annular groove 4011. Optionally, the second sealing ring 7 is made of rubber. The size of the second sealing ring 7 is adapted to the second annular groove 4011. The outer ring of the second sealing ring 7 is tightly fitted with the inner wall of the sealing pressure chamber 204 to form a reliable dynamic seal, thereby separating the fluid medium in the sealing pressure chamber 204 from that in the test cavity 4022. This prevents the fluid medium in the sealing pressure chamber 204 and the test cavity 4022 from communicating with each other, ensuring that the test pressure and sealing thrust are independent and do not interfere with each other, effectively preventing test data distortion and thus improving the reliability of the test data. At the same time, the function of the second annular groove 4011 prevents the second sealing ring 7 from shifting during sliding, so that the second sealing ring 7 always maintains a sealing state during the reciprocating sliding of the piston rod 4, preventing high-pressure fluid from leaking out along the mating gap, and improving the overall high-pressure sealing safety and operational reliability of the testing device.

[0033] In some embodiments of the present invention, a third annular groove 4032 is provided on the outer peripheral side of the sealing section 403 near the flow channel section 402. A third sealing ring 8 is sleeved inside the third annular groove 4032. Optionally, the third sealing ring 8 is made of rubber. The size of the third sealing ring 8 is adapted to the third annular groove 4032. The outer wall of the third sealing ring 8 is tightly fitted with the inner wall of the sealing pressure chamber 204 to form a dynamic seal, so as to separate the test cavity 4022 from the interface 1102 of the test piece 11, and prevent the fluid medium from leaking out from the gap between the piston rod 4 and the sealing pressure chamber 204. This allows the fluid medium in the test cavity 4022 to enter the interior of the test piece 11 through the inner flow channel 4031, thereby improving the stability of the test pressure and thus improving the accuracy of the test results. Meanwhile, the third annular groove 4032 limits the third sealing ring 8, ensuring that the third sealing ring 8 provides a reliable seal during the axial movement of the piston rod 4, preventing misalignment of the sealing ring during reciprocating motion, effectively preventing high-pressure fluid leakage from interfering with the pressure test, and further improving the overall test accuracy of the test device.

[0034] like Figure 2 and Figure 5As shown, in some embodiments of the present invention, the first sealing surface 4033 is configured as a conical shape adapted to the mating surface 1103. The conical shape design enables automatic centering and alignment with the mating interface 1102 of the test piece 11, ensuring accurate and reliable mating position, forming a conical fit sealing structure, improving the sealing effect at the interface, and effectively preventing leakage of the test medium at the mating position. In addition, a fourth annular groove 4034 is provided on the first sealing surface 4033, and a fourth sealing ring 9 is embedded in the fourth annular groove 4034. The outer peripheral side of the fourth sealing ring 9 is tightly fitted with the mating surface 1103 of the test piece 11. Through the sealing effect of the fourth sealing ring 9, the sealing effect at the interface is further improved. At the same time, the conical fit combined with the compression force of the fluid self-sealing makes the force on the fourth sealing ring 9 more uniform, improving the sealing reliability between the first sealing surface 4033 and the mating surface 1103 of the test piece 11. Optionally, the fourth sealing ring 9 is made of rubber. The size of the fourth sealing ring 9 is adapted to the fourth annular groove 4034. The setting of the fourth sealing ring 9 allows for flexible contact between the first sealing surface 4033 and the mating surface 1103, avoiding direct impact and wear of the first sealing surface 4033 on the mating surface 1103 of the test piece 11 during high-pressure testing. In other words, it avoids the squeezing damage caused by hard metal contact, so as to protect the original sealing performance of the test piece 11 and meet the quality requirements for product delivery or secondary use.

[0035] It should be noted that the fourth sealing ring 9 is specifically an O-ring. The O-ring enables a graded sealing structure of soft and hard seals between the first sealing surface 4033 and the mating surface 1103. When the fluid medium is under low pressure, the O-ring protrudes from the mating surface 1103, filling the gap between the first sealing surface 4033 and the mating surface 1103 to form a soft seal and prevent low-pressure leakage. When the fluid medium is under high pressure, the first sealing surface 4033 and the mating surface 1103 are directly fitted together to form a hard seal. The O-ring is pressed into the fourth annular groove 4034, relying on high-precision fit to resist high pressure and avoid the failure of the soft seal under high-pressure conditions, effectively improving the sealing reliability of the test device.

[0036] The operation method of the fluid self-sealing high-pressure testing device used in this invention specifically includes the following steps: First, the component to be tested is placed in the docking groove 3 between the two cavity seats 2 on the base 1 to complete rapid positioning, so that the docking interface 1102 of the component to be tested 11 is coaxially aligned with the piston rod 4 in the two cavity seats 2. Then, fluid medium is introduced into the sealing pressure chamber 204 through the sealing flow channel interface 201. The fluid medium acts positively on the piston rod 4, pushing the piston rod 4 to move axially towards the component to be tested 11 until the first sealing surface 4033 is tightly attached to the docking surface 1103. At the same time, the outer peripheral side of the fourth sealing ring 9 is tightly attached to the docking surface 1103 of the component to be tested 11, completing the sealing docking. The fluid medium is controlled to enter the test cavity 4022 from the test flow channel interface 203, and flow into the inner flow channel 4031 through the through hole 4021, and finally enter the internal flow channel 1101 of the component to be tested 11 to start the pressure resistance and sealing test, and the test data of the component to be tested 11 is collected to complete the pressure test of the component to be tested 11. As the test pressure increases, the axial clamping force of the fluid in the sealed pressure chamber 204 on the piston rod 4 increases synchronously and adaptively, achieving high-pressure self-sealing without the need for an external clamping mechanism. After the test is completed, the control fluid medium is introduced into the reset pressure chamber from the reset flow channel interface 202. The fluid medium pushes the piston rod 4 to move in the opposite direction and disengage from the test piece 11, allowing the test piece 11 to be quickly removed. The entire process does not require tightening the pipes at the interface 1102 one by one, and will not damage the test piece 11. The overall testing device achieves high efficiency, non-destructive testing, and high versatility.

[0037] It should be noted that the test flow channel interface 203 connects a pressure sensor (not shown in the figure) and a flow sensor (not shown in the figure) to improve the real-time acquisition of data such as the actual pressure resistance value and leakage of the test component 11 by the pressure sensor and the flow sensor, and compares them with the actual pressure resistance value to automatically determine whether the test component 11 is qualified.

[0038] In some embodiments of the present invention, the sealing flow channel interface 201 and the test flow channel interface 203 are respectively connected to the same external pressure source through high-pressure connectors. That is, the sealing flow channel interface 201, the reset flow channel interface 202, and the test flow channel interface 203 are pressurized through different branches of the same pressure source P, without any cross-flow channels. The fluid medium entering the sealing pressure chamber 204 from the sealing flow channel interface 201 only acts on the left end face of the piston rod 4 to provide sealing force and does not participate in the conduction of the test fluid. The fluid medium entering the test cavity 4022 from the test flow channel interface 203 only enters the internal flow channel 1101 of the test piece 11 through the internal flow channel 4031 and does not affect the application of the sealing force. Even if the fluid medium in the sealing pressure chamber 204 experiences pressure changes due to fluctuations in operating conditions, it will not be conducted to the test fluid path. The pressure data of the test fluid path can truly reflect the actual pressure resistance and leakage of the test piece 11. Meanwhile, the fluid medium entering the reset pressure chamber from the reset flow channel interface 202 only drives the piston rod 4 to reset after the test is completed, and does not participate in the test process, further avoiding interference and improving the test accuracy of the test device.

[0039] It should be noted that the end face of the piston rod 4 furthest from the mating groove 3 is larger than the radial cross-section of the sealing section 403, so that the positive force of the fluid medium acting on the piston rod 4 is greater than the negative force generated by the fluid medium on the piston rod 4. As the pressure of the fluid medium increases, the positive sealing force of the fluid medium acting on the piston rod 4 becomes larger and larger, so as to achieve self-sealing between the first sealing surface 4033 and the mating surface 1103. Figure 3As shown, taking the cavity seat 2 located on the left side of the base 1 as an example, the fluid medium enters the sealing pressure chamber 204 through the sealing flow channel interface 201. The sealing pressure P of the fluid medium located at the left end of the sealing pressure chamber 204 acts positively on the left end face of the piston rod 4, generating a sealing force F1=P×S1, where P is the pressure of the fluid medium and S1 is the effective force-bearing area of ​​the left end face of the piston rod 4. The sealing force F1 pushes the piston rod 4 to move axially, so that the first sealing surface 4033 tightly fits the mating surface 1103, completing the sealing mating. The fluid medium enters the test cavity 4022 through the test flow channel interface 203, and then flows into the internal flow channel 1101 of the test piece 11 through the inner flow channel 4031. At this time, the test pressure P of the fluid medium located in the inner flow channel 1101 acts in the opposite direction on the right end face of the sealing section 403, generating a reverse thrust F2=P×S2, where P is the pressure of the fluid medium and S2 is the radial cross-sectional area of ​​the sealing section 403 located at the position of the fourth sealing ring 9. Since S1>S2, the net sealing force F=F1-F2 of the piston rod 4 will increase synchronously with the increase of the test pressure P, achieving a self-sealing effect where the higher the pressure, the more reliable the seal. Moreover, it can completely get rid of the dependence on the external clamping mechanism, that is, it does not need to provide tens of thousands of Newtons of clamping force to adapt to high-pressure testing, greatly reducing the size of the equipment and making it easier to move to adapt to the flexible testing needs of multiple stations.

[0040] In summary, the sealing connection between the testing device and the test piece 11 is achieved by the first sealing surface 4033 of the piston rod 4 fitting against the mating surface 1103 of the test piece 11. The test piece 11 and the testing device only require a single positioning and connection, eliminating the need to individually tighten each pipe. This eliminates the most time-consuming joint-by-joint disassembly and assembly step in traditional solutions, reducing the installation time of the test piece 11 and improving testing efficiency. Furthermore, the elimination of frequent adapter replacements reduces the pipe connection time between the test piece 11 and the testing device, further improving testing efficiency to meet the fast-paced testing requirements of production lines.

[0041] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0042] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the present invention.

Claims

1. A fluid self-sealing high-pressure testing device, characterized in that, include: The base (1) is provided with at least two cavity seats (2), and a docking groove (3) for placing the test piece (11) is provided between the adjacent ends of the at least two cavity seats (2). The outer periphery of the cavity seat (2) is provided with a sealing flow channel interface (201) and a test flow channel interface (203) at intervals along its length direction, and a sealing pressure chamber (204) is provided inside. The end of the sealing pressure chamber (204) away from the docking groove (3) is connected to the sealing flow channel interface (201). A piston rod (4) is slidably disposed inside the sealed pressure chamber (204). The piston rod (4) includes: an integrally formed mating section (401), a flow channel section (402), and a sealing section (403). The outer side wall of the mating section (401) is slidably connected to the inner side wall of the sealed pressure chamber (204). A test cavity (4022) is provided between the flow channel section (402) and the inner side wall of the sealed pressure chamber (204) and communicates with the test flow channel interface (203). The end of the sealing section (403) is provided with a first sealing surface (4033) for fitting with the mating surface (1103) of the test piece (11), and an inner flow channel (4031) is opened in the sealing section (403). One end of the inner flow channel (4031) is connected to the test cavity (4022), and the other end extends to the first sealing surface (4033) and is connected to the inner flow channel (1101) of the test piece (11).

2. The fluid self-sealing high-pressure testing device according to claim 1, characterized in that, The outer peripheral side of the cavity seat (2) is provided with a reset flow channel interface (202). The reset flow channel interface (202) is located between the sealing flow channel interface (201) and the test flow channel interface (203). The sealing pressure chamber (204) is provided with an annular step (2041) at the position of the reset flow channel interface (202). The end of the mating section (401) away from the flow channel section (402) is integrally formed with a stop part (404). The stop part (404) and the annular step (2041) surround and form a reset pressure chamber, and the reset pressure chamber is connected to the reset flow channel interface (202).

3. The fluid self-sealing high-pressure testing device according to claim 2, characterized in that, The flow channel section (402) is provided with one or more through holes (4021), which extend radially along the sealing section (403) and connect the test cavity (4022) and the inner flow channel (4031).

4. The fluid self-sealing high-pressure testing device according to claim 3, characterized in that, The end of the sealing pressure chamber (204) away from the docking groove (3) passes through the cavity seat (2) and is provided with a sealing tail plug (5) for sealing the sealing pressure chamber (204).

5. The fluid self-sealing high-pressure testing device according to any one of claims 2-4, characterized in that, The outer peripheral side of the stop part (404) is provided with a first annular groove (4041), and a first sealing ring (6) is sleeved in the first annular groove (4041). The outer peripheral side of the first sealing ring (6) is attached to the inner wall of the sealing pressure chamber (204).

6. The fluid self-sealing high-pressure testing device according to any one of claims 1-4, characterized in that, The outer peripheral side of the mating section (401) near the flow channel section (402) is provided with a second annular groove (4011), and a second sealing ring (7) is sleeved in the second annular groove (4011). The outer peripheral side of the second sealing ring (7) is attached to the inner wall of the sealing pressure chamber (204).

7. The fluid self-sealing high-pressure testing device according to any one of claims 1-4, characterized in that, The sealing section (403) has a third annular groove (4032) on its outer peripheral side near the flow channel section (402). A third sealing ring (8) is sleeved inside the third annular groove (4032). The outer peripheral side of the third sealing ring (8) is attached to the inner wall of the sealing pressure chamber (204).

8. The fluid self-sealing high-pressure testing device according to any one of claims 1-4, characterized in that, The first sealing surface (4033) is set in a conical shape and is adapted to the mating surface (1103). The first sealing surface (4033) is provided with a fourth annular groove (4034). A fourth sealing ring (9) is embedded in the fourth annular groove (4034). The outer peripheral side of the fourth sealing ring (9) is in contact with the mating surface (1103).

9. An operating method for a fluid self-sealing high-pressure testing device, applied to the fluid self-sealing high-pressure testing device according to any one of claims 1-8, characterized in that, The operation method includes: The test piece (11) is placed directly in the docking groove (3), so that the sealing pressure chamber (204) is coaxially aligned with the docking interface (1102) of the test piece (11). The fluid medium is controlled to enter the sealing pressure chamber (204) through the sealing flow channel interface (201). The fluid medium acts positively on the piston rod (4), pushing the piston rod (4) to move axially, so that the first sealing surface (4033) is in contact with the docking surface (1103). After the inner flow channel (4031) and the inner flow channel (1101) of the test piece (11) are sealed and connected, the control fluid medium is sequentially passed through the test flow channel interface (203), the test cavity (4022), and the inner flow channel (4031) into the inner flow channel (1101) of the test piece (11), and the test data of the test piece (11) are collected to complete the pressure test of the test piece (11).

10. The operation method of the fluid self-sealing high-pressure testing device according to claim 9, characterized in that, The sealing flow channel interface (201) and the test flow channel interface (203) are respectively connected to the same external pressure source through a high-pressure connector, and the end face of the piston rod (4) away from the docking groove (3) is larger than the radial cross section of the sealing section (403), so that the positive force of the fluid medium acting on the piston rod (4) is greater than the negative force generated by the fluid medium on the piston rod (4). As the pressure of the fluid medium continues to increase, the sealing force of the fluid medium acting on the piston rod (4) increases, so as to achieve self-sealing between the first sealing surface (4033) and the docking surface (1103).

Images