Sealing performance test equipment under fatigue load

Abstract

The utility model discloses a sealing performance test device under fatigue load, which comprises a fixed template and a movable template assembly capable of performing reciprocating rectilinear motion relative to the fixed template along the axial direction, and the movable template assembly comprises an upper template, a limiting seat and a lower template which are fixedly arranged with one another, the first to-be-tested sealing element is arranged between the upper template and the upper end face of the fixed template, and the second to-be-tested sealing element is arranged between the lower template and the lower end face of the fixed template, so that the movable template assembly is driven to do reciprocating rectilinear motion along the axial direction to load the to-be-tested sealing elements. Therefore, the alternating compression displacement test of the to-be-tested sealing element can be realized, the sealing leakage rate of the to-be-tested sealing element can be tested, the anti-fatigue characteristic and the service life of the to-be-tested sealing element can be obtained, and great help is provided for production and research and development of sealing products meeting corresponding working conditions.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing leakage, in particular to sealing performance testing equipment under fatigue load. Background Art

[0002] In industrial equipment in the fields of nuclear power, thermal power, petroleum, chemical industry, energy, etc., under high temperature, high pressure, accompanied by thermal shock and thermal cycle, medium pressure fluctuation and other process or transient working conditions, fatigue loads are generated on the seals of the equipment under these conditions. Studies have found that seals will produce alternating compression and displacement under the action of this fatigue load. Under the action of long-term fatigue load and alternating compression displacement, the sealing performance of the seal will be affected, which will reduce the life of the seal or seal failure, leading to leakage. In order to study the influence of fatigue load and alternating compression displacement on the sealing of seals, as well as the ability of seals to resist fatigue load and alternating compression displacement, it is necessary to develop a method and device for testing sealing performance under fatigue load for the research and performance testing of seals. Utility Model Content

[0003] The utility model aims to provide a sealing performance testing device under fatigue load.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a sealing performance testing device under fatigue load, which is used to test the sealing performance of two groups of seals to be tested, the two groups of seals to be tested are respectively a first seal to be tested and a second seal to be tested, and the testing device comprises:

[0005] A fixed template, wherein the fixed template has a first end face and a second end face which are arranged at two different ends of the fixed template in the axial direction, and a distance between the first end face and the second end face is h;

[0006] A movable template assembly, wherein the movable template assembly can be arranged to reciprocate linearly relative to the fixed template along the axial direction, and the movable template assembly includes an upper template, a limit seat and a lower template fixed to each other, the limit seat has an axial height of H, Hh=L, and L>0; the upper template and the lower template are arranged on different sides of the fixed template in the axial direction, the upper template has a first sealing surface facing the first end surface, and the lower template has a second sealing surface facing the second end surface;

[0007] A first sealing member, which is disposed between the first sealing surface and the first end surface and is used for sealing connection between the two;

[0008] A second sealing member, which is disposed between the second sealing surface and the second end surface and is used for sealing therebetween;

[0009] The first seal to be tested is disposed between the first sealing surface and the first end surface and is used for sealing therebetween, and the first seal to be tested is located radially inside the first seal; the second seal to be tested is disposed between the second sealing surface and the second end surface and is used for sealing therebetween, and the second seal to be tested is located radially inside the second seal;

[0010] A medium cavity and a medium channel are provided on the fixed template. The medium cavity is located radially inward of the first seal to be tested and the second seal to be tested, and the medium cavity is connected to the first end face and the second end face at the same time. The medium channel is connected to the medium cavity and is used to input the test medium into the medium cavity. The fixed template is also provided with a leakage collection structure for collecting the test medium leaked from the first seal to be tested and the second seal to be tested.

[0011] Preferably, the fixed template is provided with a guide hole penetrating along the axial direction, the guide hole is located radially inward of the first seal to be tested and the second seal to be tested, and the limit seat is inserted into the guide hole in an axially sliding manner.

[0012] In some embodiments, a first groove is provided on the first end surface, and the first groove is located on the radial inner side of the first seal to be tested; a second groove is provided on the second end surface, and the second groove is located on the radial inner side of the second seal to be tested, the first groove and the second groove are connected to each other through a connecting channel opened on the fixed template, the medium channel is connected to the connecting channel, and the first groove and the second groove together constitute the medium cavity.

[0013] In some embodiments, a connecting channel connected to the medium channel is provided on the fixed template, and the connecting channel has a first outlet and a second outlet respectively provided at two ends, the first outlet is located radially inward of the first seal to be tested, and the second outlet is located radially inward of the second seal to be tested, wherein:

[0014] The first outlet is located at the first end surface, and the second outlet is located at the second end surface, and the connecting channel constitutes the medium cavity;

[0015] Alternatively, the first end surface is provided with a first groove, the first outlet is axially connected to the first groove and communicates with each other, the second outlet is located on the second end surface, and the communication channel and the first groove together constitute the medium cavity;

[0016] Alternatively, the second end surface is provided with a second groove, the second outlet is axially connected to the second groove and communicates with each other, the first outlet is located on the first end surface, and the communication channel and the second groove together constitute the medium cavity.

[0017] Preferably, the first end face is provided with a first sealing groove, the second end face is provided with a second sealing groove, the first seal to be tested is compressed in the first sealing groove, and the second seal to be tested is compressed in the second sealing groove, wherein the effective compression amount of the first seal to be tested and the second seal to be tested is L.

[0018] Preferably, the movable template assembly also includes connecting screws, which axially fix the upper template and the lower template so that the limit seat is fixedly pressed between the upper template and the lower template, wherein the connecting screws have a plurality of groups distributed at intervals along the circumferential direction, and the connecting screws are located radially outside the first seal and the second seal.

[0019] In some embodiments, the fixed template is provided with a through hole extending through the fixed template in the axial direction, and the connecting screw is inserted into the through hole in the axial direction with clearance fit.

[0020] Preferably, the leakage collection structure includes a first leakage duct chamber, a second leakage duct chamber, a first leakage duct channel and a second leakage duct channel which are arranged on the fixed template, the first leakage duct chamber is located between the first seal and the first seal to be tested, the second leakage duct chamber is located between the second seal and the second seal to be tested, the first leakage duct channel connects the first leakage duct chamber with a leakage detector, the second leakage duct channel connects the second leakage duct chamber with the leakage detector, and the first leakage duct channel and the second leakage duct channel are not connected to each other.

[0021] Preferably, the upper template is located above the movable template assembly, the lower template is located below the movable template, and the movable template assembly is configured to reciprocate in a vertical direction.

[0022] In some embodiments, the testing equipment further comprises a driving device for driving the movable template assembly to reciprocate linearly in the axial direction, wherein the driving device is configured to drive the movable template assembly to reciprocate in the axial direction with a displacement W, wherein 0<W≤L.

[0023] In some embodiments, the driving device is a press, which includes an upper press head, a lower press head, and a power member. The upper press head is fixedly connected to the upper mold plate, and the lower press head is fixedly connected to the lower mold plate. The power member is configured to alternately drive the upper press head and the lower press head to reciprocate axially at the displacement W.

[0024] Due to the application of the above-mentioned technical scheme, the utility model has the following advantages compared with the prior art: the sealing performance testing equipment under fatigue load provided by the embodiment of the utility model realizes the loading of the seal to be tested by the axial reciprocating linear motion of the configured dynamic template assembly, can realize the alternating compression displacement test of the seal to be tested, and can test the sealing leakage rate of the seal to be tested, so as to obtain the fatigue resistance and service life of the seal to be tested, which provides great help for the production and research and development of sealing products that meet the corresponding working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Attached Figure 1 This is a schematic diagram of the overall structure of a moving template assembly in a sealing performance testing device according to an embodiment of the utility model;

[0026] Attached Figure 2 For attachment Figure 1 The omitted view of the dynamic template component;

[0027] Attached Figure 3 It is a longitudinal cross-sectional schematic diagram of a fixed template in a sealing performance testing device according to an embodiment of the utility model;

[0028] Attached Figure 4 It is a partial structural schematic diagram of the sealing performance testing device of the embodiment of the utility model, wherein the downward displacement of the upper template is L;

[0029] Attached Figure 5 For attachment Figure 4 The downward displacement of the lower template in the sealing performance test equipment is L;

[0030] Attached Figure 6 For attachment Figure 4 A schematic diagram of the structure of a sealing performance test device after the upper template is displaced downward or the lower template is displaced upward by a certain distance;

[0031] Attached Figure 7 This is a schematic diagram of the overall structure of the sealing performance testing device according to an embodiment of the utility model, wherein leakage occurs at both the first sealing member to be tested and the second sealing member to be tested;

[0032] Attached Figure 8 For attachment Figure 7 A schematic diagram of a sealing performance test device after omitting the leakage detection system and the detection medium pressurization system;

[0033] Attached Fig. 9 This is a schematic diagram of the relationship between the test fatigue load and the seal leakage rate during the test;

[0034] Attached Fig.10 This is a schematic diagram of the relationship between axial compression displacement and seal leakage rate during the test;

[0035] Wherein: 100, moving plate assembly; 200, pressure head; 201, upper pressure head; 202, lower pressure head; 300, leakage detection system; 301, leakage detector; 400, detection medium pressurization system; 401, medium storage tank;

[0036] 1. Fixed template; 1A, first end surface; 1B, second end surface;

[0037] 11. guide hole; 12. first groove; 13. second groove; 14. communication channel; 15. medium channel; 16. first sealing groove; 17. second sealing groove; 18. first mounting groove; 19. second mounting groove; 110. first leakage guiding cavity; 111. second leakage guiding cavity; 112. first leakage guiding channel; 113. second leakage guiding channel; 114. perforation;

[0038] 2. Upper template; 21. First sealing surface;

[0039] 3. Lower template; 31. Second sealing surface;

[0040] 4. Limit seat; 5. Connecting screw; 6. First sealing member; 7. Second sealing member; 8. First sealing member to be tested; 9. Second sealing member to be tested. DETAILED DESCRIPTION

[0041] The technical solution of the utility model is described in detail below in conjunction with the accompanying drawings and specific embodiments, so that the advantages and features of the utility model can be more easily understood by those skilled in the art. Obviously, the embodiments described in this application are only part of the embodiments of the application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of this application.

[0042] See also Figures 1 to 9 A sealing performance testing device under fatigue load is shown, and the testing device is used to test the sealing performance of the tested seal under fatigue load. The testing device provided in this embodiment can also test two groups of tested seals (respectively, the first tested seal 8 and the second tested seal 9) at the same time, wherein the two groups of tested seals, namely the first tested seal 8 and the second tested seal 9, are both annular sealing rings. The testing device includes a fixed template 1 and a movable template assembly 100, wherein:

[0043] The fixed template 1 has a first end surface 1A and a second end surface 1B which are respectively arranged at two different ends of the fixed template 1. Figure 4 As shown in , the fixed template 1 is configured so that its axial direction extends in the up-down direction, the first end face 1A and the second end face 1B are the upper and lower axial end faces of the fixed template 1, and the distance between the first end face 1A and the second end face 1B is h.

[0044] The movable template assembly 100 can reciprocate linearly relative to the fixed template 1 along the axial direction. The movable template assembly 100 includes an upper template 2, a limit seat 4 and a lower template 3 fixed to each other. The limit seat 4 has an axial height of H, wherein Hh=L, and L>0, and the L is mainly determined according to the design value of the effective compression amount of the seal to be tested. The upper template 2 and the lower template 3 are arranged on different sides of the fixed template 1, that is, the upper template 2 is arranged above the fixed template 1, and the lower template 3 is arranged below the fixed template 1. The upper template 2 has a first sealing surface 21 facing the first end surface 1A, and the lower template 3 has a second sealing surface 31 facing the second end surface 1B.

[0045] The test equipment also includes a first seal 6 and a second seal 7, both of which are annular sealing rings, wherein the first seal 6 is arranged between the first sealing surface 21 and the first end face 1A and is used for a sealing connection between the two, and the second seal 7 is arranged between the second sealing surface 31 and the second end face 1B and is used for a sealing connection between the two; the first seal to be tested 8 is arranged between the first sealing surface 21 and the first end face 1A and is used for a sealing connection between the two, and the first seal to be tested 8 is located on the radial inner side of the first seal 6; the second seal to be tested 9 is arranged between the second sealing surface 31 and the second end face 1B and is used for a sealing connection between the two, and the second seal to be tested 9 is located on the radial inner side of the second seal 7.

[0046] See also Figure 4 As shown, a medium cavity and a medium channel 15 are provided on the fixed template 1. The medium cavity is located radially inside the first seal 8 to be tested and the second seal 9 to be tested, and the medium cavity is connected to the first end face 1A and the second end face 1B at the same time. The medium channel 15 is connected to the medium cavity and is used to input the test medium into the medium cavity. The test medium can contact the first seal 8 to be tested and the second seal 9 to be tested in the medium cavity, so that the first seal 8 to be tested and the second seal 9 to be tested can work under the preset test conditions. The fixed template 1 is also provided with a leakage collection structure for collecting the test medium leaked from the first seal 8 to be tested and the second seal 9 to be tested.

[0047] Referring to the drawings, the various parts of the sealing performance testing device of this embodiment are specifically arranged as follows:

[0048] The fixed template 1 is provided with a guide hole 11 which penetrates in the axial direction. The guide hole 11 is located radially inside the first seal 8 to be tested and the second seal 9 to be tested. The limit seat 4 is inserted in the guide hole 11 in an axially sliding manner. In the process of the movable template assembly 100 reciprocating in the axial direction relative to the fixed template 1, the limit seat 4 not only provides the movable template assembly 100 with axial limitation, but also provides the movable template assembly 100 with guidance in the axial movement. In this embodiment, the limit seat 4 is cylindrical, and the guide hole 11 is also a circular through hole.

[0049] The movable template assembly 100 further includes connecting screws 5, which are fixedly connected to the upper template 2 and the lower template 3 in the axial direction, so that the limit seat 4 is fixedly pressed between the upper template 2 and the lower template 3, and also make the spacing between the first sealing surface 21 and the second sealing surface 31 consistent with the height of the limit seat 4, that is, equal to H. The connecting screws 5 have multiple groups distributed at intervals along the circumferential direction, and the connecting screws 5 are located radially outside the first sealing member 6 and the second sealing member 7. The fixed template 1 is also provided with through holes 114 that penetrate in the axial direction. The number and position of the through holes 114 correspond to the number and position of the connecting screws 5 one by one. The multiple connecting screws 5 are inserted into the multiple through holes 114 in the axial direction with clearance fit.

[0050] See also Figures 4 to 7 As shown, in this embodiment, the medium cavity is arranged in the following manner: a first annular groove 12 is arranged on the first end face 1A, and the first groove 12 is located on the radial inner side of the first seal 8 to be tested; a second annular groove 13 is arranged on the second end face 1B, and the second groove 13 is located on the radial inner side of the second seal 9 to be tested. The first groove 12 and the second groove 13 are connected through a connecting channel 14 provided on the fixed template 1, and the first groove 12 and the second groove 13 together constitute the medium cavity, and the medium channel 15 extends along the radial direction of the fixed template 1 and connects the connecting channel 14 with the circumferential outer side of the fixed template 1.

[0051] The sealing performance test equipment also includes a detection medium pressurization system 400, which at least includes a medium storage tank 401 storing a test medium, and the medium storage tank 401 is connected to the medium channel 15 through a control pipeline. By inputting the test medium into the medium pipeline 15, the medium cavity is filled with the test medium, so that the first test seal 8 and the second test seal 9 work under the preset test conditions. Here, the first groove 12 and the second groove 13 are both annular grooves, and are both connected to the guide hole 11, which also makes the processing of the first groove 12 and the second groove 13 more convenient.

[0052] In other embodiments, the medium cavity can also be set in the following manner: a connecting channel for connecting the medium channel is provided on the fixed template 1, and the connecting channel has a first outlet (not shown in the figure) and a second outlet (not shown in the figure) respectively arranged at both ends, the first outlet is located on the radial inner side of the first seal 8 to be tested, and the second outlet is located on the radial inner side of the second seal 9 to be tested. On this basis, one way is that the first outlet is located on the first end face 1A, and the second outlet is located on the second end face 1B, and the medium cavity is formed by the connecting channel; another way is that the first end face is provided with a first groove, the first outlet is connected to the first groove along the axial direction and connected to each other, the second outlet is located on the second end face 1B, and the connecting channel and the first groove together constitute the medium cavity; another way is that the second end face 1B is provided with a second groove, the second outlet is connected to the second groove along the axial direction and connected to each other, the first outlet is located on the first end face 1A, and the connecting channel and the second groove together constitute the medium cavity. Of course, in other embodiments, the medium cavity can also be formed by other ways or structures, so that the first seal 8 to be tested and the second seal 9 to be tested can both contact the test medium to work under the preset working conditions.

[0053] See also Figures 4 to 7 As shown, a first sealing groove 16 and a first mounting groove 18 are provided on the first end face 1A, a second sealing groove 17 and a second mounting groove 19 are provided on the second end face 1B, the first sealing member 6 is provided in the first mounting groove 18, and the second sealing member 7 is provided in the second mounting groove 19; the first sealing member to be tested 8 is provided in the first sealing groove 16, and the second sealing member to be tested 9 is provided in the second sealing groove 17.

[0054] In this embodiment, the design values ​​of the effective compression amounts of the first seal to be tested 8 and the second seal to be tested 9 are both L. The first sealing groove 16 and the first mounting groove 18 are configured such that when the upper template 2 is displaced downward by L, the first seal to be tested 8 can be completely compressed in the first sealing groove 16, and the first seal 6 can be completely compressed in the first mounting groove 18; similarly, the second sealing groove 17 and the second mounting groove 19 are configured such that when the lower template 3 is displaced upward by L, the second seal to be tested 9 can be completely compressed in the second sealing groove 17, and the second seal 7 can be completely compressed in the second mounting groove 19.

[0055] The sealing performance testing device further comprises a leakage detection system 300, which comprises at least a leakage detector 301, which is connected to the leakage collection structure to collect the leaked test medium and detect its leakage amount. Figures 4 to 7As shown, in this embodiment, the leakage collection structure includes a first leakage chamber 110, a second leakage chamber 111, a first leakage channel 112 and a second leakage channel 113 arranged on the fixed template 1, the first leakage chamber 110 is located between the first seal 6 and the first seal to be tested 8, the second leakage chamber 111 is located between the second seal 7 and the second seal to be tested 9, the first leakage channel 112 connects the first leakage chamber 110 with the leakage detector 301, and the second leakage channel 113 connects the second leakage chamber 111 with the leakage detector 301. The above-mentioned first leakage channel 112 and second leakage channel 113 are not connected to each other, so that the test medium leaked through the first seal to be tested 8 and the test medium leaked through the second seal to be tested 9 can be collected and detected respectively to obtain the corresponding sealing performance of the first seal to be tested 8 and the second seal to be tested 9.

[0056] The test equipment also includes a driving device, which is configured to drive the movable template assembly 100 to reciprocate in the axial direction, and the driving device drives the movable template assembly 100 to reciprocate in the axial direction with a displacement W, where 0<W≤L. Specifically, in this embodiment, the driving device is a press including a ram 200, and the ram 200 of the press includes an upper ram 201 and a lower ram 202, and the press also includes a power member, the upper ram 201 is fixedly connected to the upper template 2, and the lower ram 202 is fixedly connected to the lower template 3, and the power member is configured to drive the upper ram 201 and the lower ram 202 to reciprocate with a displacement W.

[0057] In other embodiments, the fixed template 1 can also be configured to extend its axial direction in the horizontal direction or in other directions. It is only necessary to ensure that the movable template assembly 100 can reciprocate linearly along the axial direction of the fixed template 1, and configure a corresponding driving device to drive the movable template assembly 100 to reciprocate linearly along the axial direction.

[0058] The following specifically describes a specific test method for using the sealing performance testing device of this embodiment to test the sealing performance of a sealing member to be tested.

[0059] First, configure the above test equipment, and assemble the components of the test equipment according to the following steps. Here, it should be noted that the following assembly process is only exemplary, and the specific assembly can be carried out in other orders, as long as the above test equipment is obtained. Specifically:

[0060] Place the fixed template 1 fixedly on the test platform, place the sliding seat 4 in the guide hole 11 of the fixed template 1 first, place the first sealing member 6 and the first sealing member to be tested 8 in the first mounting groove 18 and the first sealing groove 16 respectively, place the upper template 2 above the fixed template 1; place the second sealing member 7 and the second sealing member to be tested 9 in the second mounting groove 19 and the second sealing groove 17 respectively, and place the lower template 3 above the fixed template 1.

[0061] Subsequently, the upper template 2 and the lower template 3 are axially locked and connected by a plurality of connecting screws 5, so that the upper template 2 and the lower template 3 are pressed on different sides of the limit seat 4, so that the upper template 2, the lower template 3 and the limit seat 4 are fixed as a whole, that is, an integral dynamic template assembly 100 is formed; at the same time, the initial loading is also completed, so that the first seal 6 and the first seal to be tested 8 form a seal between the first end face 1A and the first sealing surface 21, and the second seal 7 and the second seal to be tested 9 form a seal between the second end face 1B and the second sealing surface 31.

[0062] Next, keep the fixed template 1 in a constant position on the mounting platform, fix the upper template 2 to the bottom of the upper pressure head 201 of the press, fix the lower template 3 to the top of the lower pressure head 202 of the press, connect the medium storage tank 401 and the medium channel 15 through a control pipeline, and connect the leakage detector 301 to the first leakage channel 112 and the second leakage channel 113 respectively.

[0063] After the configuration of the test equipment is completed, the test medium is introduced into the medium cavity, and the alternating loads Fa-t and Fa-u are alternately loaded through the upper pressure head 201 and the lower pressure head 202, so that the movable template assembly 100 as a whole produces an axial alternating displacement relative to the displacement, and the displacement is W, 0<W≤L.

[0064] By alternately loading Fa-t and Fa-u by the upper ram 201 and the lower ram 202 of the press, the movable platen assembly 100 generates axial alternating displacement, that is, the axial alternating compression displacements L1 and L2 of the first seal 8 and the second seal 9 under fatigue load are increased. When L1 increases, L2 decreases. L1+L2 is always constant at L. When L1 becomes 0, L2=L; when L1=L, L2=0. The alternating process is shown in FIG. Figures 5 to 7 shown.

[0065] When the first seal 8 and the second seal 9 are subjected to fatigue alternating load, the leakage detection system 300 and the detection medium pressurization system 400 are started, and the detection medium pressure P is set to measure the sealing performance of the seal under fatigue load and axial displacement alternation, and the relationship between fatigue load Fa and sealing leakage rate Q, and axial compression displacement △L and sealing leakage rate Q are tested, respectively. Fig. 9 , Fig.10 As shown, the performance parameters of the first seal to be tested 8 and the second seal to be tested 9 are obtained.

[0066] In summary, the sealing performance testing equipment under fatigue load of the utility model can realize the alternating compression displacement test on the seal to be tested, and can test the sealing leakage rate of the seal to be tested, so as to obtain the fatigue resistance and service life of the seal to be tested, which provides great help for the production and research and development of sealing products that meet the corresponding working conditions.

[0067] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A sealing performance testing device under fatigue load, used for testing the sealing performance of two groups of seals to be tested, the two groups of seals to be tested are respectively a first seal to be tested and a second seal to be tested, characterized in that: The test equipment includes: A fixed template, wherein the fixed template has a first end face and a second end face which are arranged at two different ends of the fixed template in the axial direction, and a distance between the first end face and the second end face is h; A movable template assembly, wherein the movable template assembly can be arranged to reciprocate linearly relative to the fixed template along the axial direction, and the movable template assembly includes an upper template, a limit seat and a lower template fixed to each other, the limit seat has an axial height of H, Hh=L, and L>0; the upper template and the lower template are arranged on different sides of the fixed template in the axial direction, the upper template has a first sealing surface facing the first end surface, and the lower template has a second sealing surface facing the second end surface; A first sealing member, which is disposed between the first sealing surface and the first end surface and is used for sealing connection between the two; A second sealing member, which is disposed between the second sealing surface and the second end surface and is used for sealing therebetween; The first seal to be tested is disposed between the first sealing surface and the first end surface and is used for sealing therebetween, and the first seal to be tested is located radially inside the first seal; the second seal to be tested is disposed between the second sealing surface and the second end surface and is used for sealing therebetween, and the second seal to be tested is located radially inside the second seal; A medium cavity and a medium channel are provided on the fixed template. The medium cavity is located radially inward of the first seal to be tested and the second seal to be tested, and the medium cavity is connected to the first end face and the second end face at the same time. The medium channel is connected to the medium cavity and is used to input the test medium into the medium cavity. The fixed template is also provided with a leakage collection structure for collecting the test medium leaked from the first seal to be tested and the second seal to be tested.

2. The sealing performance testing equipment under fatigue load according to claim 1, characterized in that: The fixed template is provided with a guide hole penetrating along the axial direction, the guide hole is located radially inward of the first seal to be tested and the second seal to be tested, and the limit seat is inserted into the guide hole in an axially sliding manner.

3. The sealing performance testing equipment under fatigue load according to claim 2, characterized in that: A first groove is provided on the first end surface, and the first groove is located on the radial inner side of the first seal to be tested; a second groove is provided on the second end surface, and the second groove is located on the radial inner side of the second seal to be tested, the first groove and the second groove are connected to each other through a connecting channel opened on the fixed template, the medium channel is connected to the connecting channel, and the first groove and the second groove together constitute the medium cavity.

4. The sealing performance testing equipment under fatigue load according to claim 2, characterized in that: The fixed template is provided with a communication channel connected to the medium channel, and the communication channel has a first outlet and a second outlet respectively arranged at two ends, the first outlet is located radially inside the first seal to be tested, and the second outlet is located radially inside the second seal to be tested, wherein: The first outlet is located at the first end surface, and the second outlet is located at the second end surface, and the connecting channel constitutes the medium cavity; Alternatively, the first end surface is provided with a first groove, the first outlet is axially connected to the first groove and communicates with each other, the second outlet is located on the second end surface, and the communication channel and the first groove together constitute the medium cavity; Alternatively, the second end surface is provided with a second groove, the second outlet is axially connected to the second groove and communicates with each other, the first outlet is located on the first end surface, and the communication channel and the second groove together constitute the medium cavity.

5. The sealing performance testing equipment under fatigue load according to claim 1, characterized in that: The first end face is provided with a first sealing groove, the second end face is provided with a second sealing groove, the first seal to be tested is compressed in the first sealing groove, the second seal to be tested is compressed in the second sealing groove, wherein the effective compression amount of the first seal to be tested and the second seal to be tested is L.

6. The sealing performance testing equipment under fatigue load according to claim 1, characterized in that: The movable template assembly also includes connecting screws, which axially fix the upper template and the lower template so that the limit seat is fixedly pressed between the upper template and the lower template, wherein the connecting screws have multiple groups distributed at intervals along the circumferential direction, and the connecting screws are located radially outside the first seal and the second seal.

7. The sealing performance testing equipment under fatigue load according to claim 6, characterized in that: The fixed template is provided with a through hole which penetrates along the axial direction, and the connecting screw is penetrated in the through hole with a clearance fit along the axial direction.

8. The sealing performance testing equipment under fatigue load according to claim 1, characterized in that: The leakage collection structure includes a first leakage ducting cavity, a second leakage ducting cavity, a first leakage ducting channel and a second leakage ducting channel which are arranged on the fixed template, the first leakage ducting cavity is located between the first seal and the first seal to be tested, the second leakage ducting cavity is located between the second seal and the second seal to be tested, the first leakage ducting channel connects the first leakage ducting cavity with a leakage detector, the second leakage ducting channel connects the second leakage ducting cavity with the leakage detector, and the first leakage ducting channel and the second leakage ducting channel are not connected to each other.

9. The sealing performance testing equipment under fatigue load according to any one of claims 1 to 8, characterized in that: The upper template is located above the movable template assembly, and the lower template is located below the movable template. The movable template assembly is configured to reciprocate in a vertical direction.

10. The sealing performance testing equipment under fatigue load according to claim 9, characterized in that: The testing equipment also includes a driving device for driving the movable template assembly to reciprocate linearly in the axial direction, wherein the driving device is configured to drive the movable template assembly to reciprocate in the axial direction with a displacement W, wherein 0<W≤L.

11. The sealing performance testing equipment under fatigue load according to claim 10, characterized in that: The driving device is a press, which includes an upper press head, a lower press head, and a power member. The upper press head is fixedly connected to the upper mold plate, and the lower press head is fixedly connected to the lower mold plate. The power member is configured to alternately drive the upper press head and the lower press head to reciprocate axially at the displacement W.

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