Sealed medium leakage amount detection system and detection method

Abstract

The application discloses a sealed medium leakage amount detection system and a detection method. The leakage amount detection system comprises a leakage detection device, a sealed medium supplement device, a data acquisition assembly, a leakage amount detection device, and a control and data acquisition device. The second container with the sealed medium cavity in the leakage detection device is arranged in the first container in a manner that the second container can rotate around the axis of the second container and can move linearly along the radial direction of the second container. The sealed medium leakage amount detection system can detect the sealed leakage amount of the sealing surface of the sealing piece under the two test conditions of linear reciprocating and rotary reciprocating, so as to obtain the sealing performance of the sealing piece under the linear reciprocating and rotary reciprocating, and provide a test basis for studying the service life of the sealing piece.

Description

Technical Field

[0001] The invention relates to a sealing medium leakage detection system and a detection method. Background Art

[0002] Industrial equipment in the fields of nuclear power, thermal power, petroleum, chemical industry, energy, etc. often has harsh working conditions such as high temperature, high pressure, thermal shock (thermal cycle), medium pressure fluctuation, etc., which places high requirements on the sealing of the equipment, especially the temperature alternation. Due to the different thermal expansion coefficients of the materials of the various components of the structure and the temperature difference in different parts, the various components of the sealing structure will undergo asynchronous deformation, causing the sealing surface of the seal and the sealed surface of the equipment to have relative displacement. If the operating temperature of the equipment continues to alternate or the start-stop frequency of the equipment is high, the sealing surface of the seal and the sealed surface of the equipment will be in pressure contact. The friction generated by the relative displacement of the sealing surface of the seal and the sealed surface will cause the sealing surface of the seal to wear, thereby reducing the sealing performance or affecting the service life.

[0003] In this context, to improve the sealing performance of seals under conditions of continuous temperature fluctuations or high-frequency start-up and shutdown, where there is relative displacement between the sealing surface and the sealed surface, or to extend the service life of seals and ensure safe production, it is necessary to conduct research and testing on sealing products. Representative test methods are essential for this research and testing. Therefore, it is necessary to develop a detection system and method that can detect the leakage of sealing media. Summary of the Invention

[0004] The first object of the present invention is to provide a sealing medium leakage detection system for detecting the sealing leakage of the sealing member under the condition of relative displacement between the sealing surface and the sealed surface of the sealing member, thereby providing an experimental basis for studying the service life of the sealing member.

[0005] To achieve the above object, the present invention adopts a technical solution: a sealing medium leakage detection system, comprising:

[0006] A leakage detection device includes a first container having a sealed first container cavity, and a second container disposed in the first container cavity, wherein the second container has two sealing end surfaces disposed at two different ends in its axial direction, each of the sealing end surfaces being sealingly connected to the inner wall of the first container via a sealing member, and the second container being disposed in the first container cavity so as to be both rotatable about its own axis and movable linearly in its own radial direction, wherein the inner cavity of the second container is sealed by the first container to form a sealed medium cavity, a portion of the first container cavity located on the outer periphery of the second container constituting a leakage medium cavity, and the first container is provided with a leak guide hole interconnected with the leakage medium cavity;

[0007] a sealing medium supply device, for supplying sealing medium into the sealing medium cavity;

[0008] A data acquisition component, comprising a first acquisition component for acquiring the pressure and temperature in the leakage medium cavity, and a second acquisition component for acquiring the pressure and temperature in the sealing medium cavity;

[0009] a leakage detection device for obtaining the leakage amount of the sealing medium flowing out of the leakage hole;

[0010] A control and data acquisition device, wherein the control and data acquisition device is signal-connected to the sealing medium supply device, the data acquisition component and the leakage detection device.

[0011] In which, the leakage detection device also includes a reciprocating rotation drive mechanism for driving the second container to rotate around its own axis, and a reciprocating linear drive mechanism for driving the second container to move reciprocatingly in a radial direction. One of the reciprocating rotation drive mechanism and the reciprocating linear drive mechanism is arranged in conjunction with the second container.

[0012] Preferably, the leakage detection device has a first working state and a second working state. When the leakage detection device is in the first working state, the second container and the reciprocating linear drive mechanism are separated from each other, and the second container and the reciprocating rotary drive mechanism are engaged with each other and driven by the reciprocating rotary drive mechanism to rotate around its own axis; when the leakage detection device is in the second working state, the second container and the reciprocating rotary drive mechanism are separated from each other, and the second container and the reciprocating linear drive mechanism are engaged with each other and driven by the reciprocating linear drive mechanism to reciprocate along the radial straight line.

[0013] Preferably, the second container includes a second container body in a hollow cylindrical shape, and a supporting flange fixed in the inner cavity of the second container body. The axial end faces on both sides of the second container body respectively constitute the two sealing end faces. The supporting flange is arranged at a distance from the sealing end faces. A connecting hole is provided on the supporting flange that penetrates along the axial direction. The connecting hole connects to the inner cavity of the second container body. The reciprocating rotating drive mechanism includes a rotating drive shaft that can be rotatably arranged on the first container around its own axis. The rotating drive shaft has a joining end that extends into the sealing medium cavity, and a joining structure that is mutually engaged along the axial direction is provided between the joining end and the supporting flange.

[0014] In some embodiments, the support flanges are provided on both axial ends of the second container body, and the two support flanges are spaced apart along the axial direction of the second container. The rotation drive shafts are provided on both axial ends of the first container, and the rotation drive shafts can also be slidably provided on the first container along their own axial direction. The coupling structure is provided between the two rotation drive shafts and the support flanges at the corresponding ends, and the axial center lines of the two rotation drive shafts extend collinearly. The reciprocating rotation drive mechanism also includes a reciprocating rotation drive member connected to one of the rotation drive shafts.

[0015] In some embodiments, the coupling structure includes a coupling protrusion and a coupling groove that can be axially engaged with each other, wherein the coupling protrusion is arranged on the coupling end and extends protrudingly from the coupling end axially toward the support flange, and the coupling groove is opened on the support flange and is arranged to penetrate the support flange axially, wherein when the coupling protrusion and the coupling groove are disengaged from each other, there is an axial distance between the coupling protrusion and the support flange.

[0016] Preferably, the reciprocating linear drive mechanism includes a linear drive shaft that is arranged on the first container and can move linearly along its own axis, the linear drive shaft has a driving end extending into the leakage medium cavity, and a coupling seat is fixedly provided on the outside of the second container, and a detachably fixed connection structure is provided between the coupling seat and the driving end.

[0017] Preferably, the first container includes a first container body with a hollow cylindrical shape, two end face flanges fixedly and sealingly arranged on the axial ends on both sides of the first container body, and the first container cavity is formed between the first container body and the two end face flanges, wherein the inner diameter of the first container body is larger than the outer diameter of the second container, the first container body and the end face flanges on both sides are connected by a plurality of bolts distributed at circumferential intervals, the two sealing end faces are respectively sealed and connected to the end face flanges on both sides by the sealing members, and a guide groove is provided on the inner side of the end face flange to provide radial sliding guidance for the second container, the second container can both rotate relatively around its own axis and slide relatively radially in cooperation with the guide grooves on both sides, and the leakage hole is provided on the first container body.

[0018] Preferably, the sealing medium is gas, and the sealing medium supply device includes a gas source tank storing the sealing medium, a booster pump for pressurizing the sealing medium output from the gas source tank, and a heater for heating the pressurized sealing medium.

[0019] Preferably, the sealing medium is gas, and the leakage detection device includes:

[0020] A leakage measurement box having a closed detection cavity for storing a detection liquid, a medium inlet being provided at the top of the leakage measurement box, and a liquid outlet being provided at the bottom of the leakage measurement box;

[0021] a liquid level gauge, used to measure the liquid level of the detection liquid in the leakage measurement box;

[0022] an air intake assembly disposed between the medium inlet and the leak guide hole, the air intake assembly comprising a drainage pipe connected to the leak guide hole, a cooler having an inlet end connected to the end of the drainage pipe, and an air intake pipe connected between an outlet section of the cooler and the medium inlet;

[0023] a liquid discharge pipe having a liquid discharge port, the liquid discharge pipe being connected to the liquid outlet and vertically extending upward from the liquid outlet and being higher than the medium inlet;

[0024] A liquid replenishing device is used to supply the detection liquid into the leakage measurement box.

[0025] A second object of the present invention is to provide a method for detecting leakage of a sealing medium.

[0026] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a method for detecting the leakage of a sealing medium, which is implemented based on the above-mentioned sealing medium leakage detection system, wherein the reciprocating linear drive mechanism is disengaged from the second container and the reciprocating rotary drive mechanism is engaged with the second container and drives the second container to rotate around its own axis, or the reciprocating rotary drive mechanism is disengaged from the second container and the reciprocating linear drive mechanism is engaged with the second container and drives the second container to move in a straight line along its own radial direction, wherein, during the process of the second container rotating around its own axis or moving in a straight line along its own radial direction, the temperature value and pressure value in the sealing medium cavity are always maintained within a preset range.

[0027] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: the sealing medium leakage detection system and detection method of the present invention can detect the sealing leakage of the sealing surface of the seal under two test conditions: linear reciprocating and rotational reciprocating, thereby obtaining the sealing performance of the seal under linear reciprocating and rotational reciprocating, and providing a test basis for studying the service life of the seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Attachment Figure 1 This is a schematic diagram of the overall structure of a sealing medium leakage detection system according to a specific embodiment of the present invention;

[0029] Attachment Figure 2 For attachment Figure 1 A schematic diagram of the overall structure of the leakage detection device, wherein the leakage detection device is in a first working state;

[0030] Attachment Figure 3 For the attachment Figure 2 Schematic diagram of the cross-sectional structure along the AA direction;

[0031] Attachment Figure 4 For attachment Figure 2 A schematic structural diagram of the second container in the leakage detection device;

[0032] Attachment Figure 5 For attachment Figure 2 A schematic structural diagram of the first container in the leakage detection device;

[0033] Attachment Figure 6 For attachment Figure 2 Schematic diagram of the connection relationship between the first container and the reciprocating rotary drive mechanism and the reciprocating linear drive mechanism in the leakage detection device;

[0034] Attachment Figure 7 For attachment Figure 2 Schematic diagram of the overall structure of the leakage detection device converted into the second working state;

[0035] Attachment Figure 8 For attachment Figure 1 A structural diagram of a leakage detection device in a sealing medium leakage detection system;

[0036] Among them: 100, leakage detection device;

[0037] 1. First container; 11. First container cavity; 12. First container body; 121. Leakage guide hole; 13. End flange; 131. Guide groove; 132. Sealing medium input hole; 14. First boss; 141. First mounting hole; 15. Second boss; 151. Second mounting hole; 16. Bolt; 17. Heating belt; 10. Leakage medium cavity;

[0038] 2. Second container; 2a. Sealing end face; 21. Second container body; 22. Support flange; 221. Insertion slot; 222. Communication hole; 23. Engagement seat; 231. Threaded hole; 20. Sealing medium chamber;

[0039] 3. Seals;

[0040] 4. Reciprocating rotary drive mechanism; 41. Reciprocating rotary drive member; 42. Rotating drive shaft; 421. Inserting protrusion; 43. First locking end cap; 44. First sealing stuffing box;

[0041] 5. Reciprocating linear drive mechanism; 51. Reciprocating linear drive member; 52. Linear drive shaft; 521. Drive end; 53. Second locking end cap; 54. Second sealing stuffing box;

[0042] 6. Sealing medium supply device; 61. Gas source tank; 62. Booster pump; 63. Heater; 64. Control valve; 65. Temperature sensor; 66. Flow meter;

[0043] 7. Data acquisition component; 71. Pressure sensor 1; 72. Temperature sensor 1; 73. Pressure sensor 2; 74. Temperature sensor 2;

[0044] 8. Control and data acquisition device;

[0045] 9. Leakage detection device; 91. Leakage measurement box; 92. Liquid level gauge; 93. Cooler; 94. Liquid replenishing tank; 95. Air inlet pipe; 96. Liquid discharge pipe; 97. Liquid replenishing pipe; 98. Control valve; 99. Drainage pipe. DETAILED DESCRIPTION

[0046] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0047] See also Figure 1 The sealing medium leakage detection system shown includes a leakage detection device 100 , a sealing medium supply device 6 , a data acquisition component 7 , a leakage amount detection device 9 , and a control and data acquisition device 8 .

[0048] The leakage detection device 100 includes a first container 1 and a second container 2. The first container 1 has a sealed first container cavity 11. The second container 2 is disposed within the first container cavity 11. The second container 2 has two sealing end surfaces 2a located at opposite ends of the first container 1 in its axial direction. Each sealing end surface 2a is sealedly connected to the inner wall of the first container 1 via a sealing member 3. The second container 2 is disposed within the first container cavity 11 so as to be both rotatable about its own axis and capable of linear movement in its radial direction. The inner cavity of the second container 2 is enclosed by the first container 1 to form a sealing medium cavity 20. The portion of the first container cavity 11 located outside the second container 2 constitutes a leakage medium cavity 10. In other words, when a leak occurs at the sealing member 3, the sealing medium within the sealing medium cavity 20 leaks into the leakage medium cavity 10. The first container 1 is also provided with a leak guide hole 121 interconnected with the leakage medium cavity 10. This is used to guide the sealing medium leaking from the leakage medium cavity 10 through the leak guide hole 121 to the leakage detection device 9 when leakage detection is required. The leakage detection device 100 also includes a reciprocating rotation drive mechanism 4 for driving the second container 2 to rotate around its own axis, and a reciprocating linear drive mechanism 5 for driving the second container 2 to move radially back and forth. The above-mentioned reciprocating rotation drive mechanism 4 and reciprocating linear drive mechanism 5 can be respectively arranged to be engaged with the second container 2 or separated from the second container 2.

[0049] The leakage detection device 100 has a first working state and a second working state that can be switched. When the leakage detection device 100 is in the first working state, such as Figure 2 As shown, the second container 2 is separated from the reciprocating linear drive mechanism 5, and the second container 2 is engaged with the reciprocating rotary drive mechanism 4, and rotates around its own axis under the drive of the reciprocating rotary drive mechanism 4. In this working state, the reciprocating rotary drive mechanism 4 drives the sealing surface of the seal 3 and the sealed surface to generate a rotational reciprocating relative displacement friction, and at the same time, the sealing performance and service life of the seal 3 are tested. When the leakage detection device 100 is in the second working state, as shown in FIG. Figure 7 As shown, the second container 2 is separated from the reciprocating rotary drive mechanism 4 and engaged with the reciprocating linear drive mechanism 5, driving the reciprocating linear drive mechanism 5 to produce radial linear reciprocating motion. In this operating state, the reciprocating linear drive mechanism 5 drives the sealing surface of the seal 3 and the sealed surface to produce linear reciprocating relative friction, simultaneously testing the sealing performance and service life of the seal 3. In this way, the leakage detection device 100 can perform friction tests on the sealing surface of the seal 3 and the sealed surface under both linear reciprocating and rotational reciprocating conditions, thereby testing the sealing performance of the seal under both linear reciprocating and rotational reciprocating conditions.

[0050] The sealing medium supply device 6 is used to supply the sealing medium into the sealing medium cavity 20. In this embodiment, the sealing medium is gas. The sealing medium supply device 6 includes a gas source tank 61 storing a detection gas source, and a booster pump 62, a control valve 64, a flow meter 66, a heater 63, and a temperature sensor 65 connected in sequence between the outlet of the gas source tank 61 and the sealing medium input hole 132. The detection gas source in the gas source tank 61 is pressurized and heated, then enters the first container cavity 11 through the sealing medium input hole 132 and is transferred to the sealing medium cavity 20 as the sealing medium.

[0051] The data acquisition assembly 7 includes a first acquisition assembly for collecting the pressure and temperature within the leakage medium chamber 10, and a second acquisition assembly for collecting the pressure and temperature within the sealing medium chamber 20. Specifically, the first acquisition assembly includes a first pressure sensor 71 and a first temperature sensor 72, and the second acquisition assembly includes a second pressure sensor 73 and a second temperature sensor 74.

[0052] The leakage detection device 9 is used to obtain the leakage of the sealing medium flowing out of the leakage hole 121. Figure 1 、 Figure 8 As shown, the leakage detection device 9 includes:

[0053] The leakage measurement box 91 has a sealed detection chamber for storing a detection liquid. The sealing medium is insoluble in the detection liquid. In this embodiment, water is used. The leakage measurement box 91 has a medium inlet at the top and a liquid outlet at the bottom.

[0054] A liquid level meter 92 is used to measure the level of the detection liquid in the leakage measurement box 91;

[0055] The air inlet pipe 95 is connected to the medium inlet at the top of the leakage measurement box 91;

[0056] A cooler 93 is used to cool the leaked gas sealing medium. The cooler 93 is provided at the inlet end of the air inlet pipe 95.

[0057] Drain pipe 99 is used to guide the leaked sealing medium into cooler 93. This drainage pipe 99 is connected between the inlet end of cooler 93 and leakage guide hole 121. Drain pipe 99 is also provided with a control valve 98. When control valve 98 is opened, the sealing medium in the leakage medium chamber 10 is transferred to cooler 93 through leakage guide hole 121, and then enters the leakage measurement box through intake pipe 95.

[0058] A drain pipe 96 having a drain port, the drain pipe 96 being connected to the liquid outlet at the bottom of the leakage measurement box 91 and extending vertically upward from the liquid outlet and being higher than the medium inlet at the top of the leakage measurement box 91;

[0059] The refill assembly, used to supply testing liquid to the leakage measurement tank 91, specifically includes a refill tank 94 and a refill tube 97 connected between the two tanks. This tube 97 is also equipped with an infusion pump 911 and a control valve 912. When testing liquid needs to be supplied to the leakage measurement tank 91, the control valve 912 is opened, and the infusion pump 911 pumps the testing liquid from the refill tank 94 into the leakage measurement tank 91. The drain port of the drain tube 96, located directly above the refill tank 94, is used to recover the testing liquid.

[0060] The control and data acquisition device 8 is signal-connected to the sealing medium supply device 6, the data acquisition component 7 and the leakage detection device 9, and is used to obtain various test data and control the test data during the test according to the test requirements, and record them as test data.

[0061] See also Figures 2 to 7 As shown, in this embodiment, the leakage detection device 100 is specifically configured as follows:

[0062] The second container 2 includes a second container body 21 in a hollow cylindrical shape, and a supporting flange 22 fixed in the inner cavity of the second container body 21. The axial end faces on both sides of the second container body 21 respectively constitute two sealing end faces 2a. The supporting flange 22 and the sealing end faces 2a are arranged at a distance. A connecting hole 222 is provided on the supporting flange 22 and passes through the axial direction. The connecting hole 222 connects to the inner cavity of the second container body 21, so that the inner cavity of the second container body 21 is connected to each other on both sides of the axial direction of the supporting flange 22.

[0063] The reciprocating rotation drive mechanism 4 includes a rotation drive shaft 42 that is rotatable around its own axis and is arranged on the first container 1. The rotation drive shaft 42 has a coupling end that extends into the sealing medium cavity 20. An axially coupled coupling structure is provided between the coupling end and the support flange 22, so that the rotation drive shaft 42 can engage with the support flange 22 to drive the second container 2 to rotate, or disengage and cannot drive the second container 2 to rotate.

[0064] Here, two support flanges 22 are provided, one on each axial end of the second container body 21, and the two support flanges 22 are spaced apart along the axial direction of the second container 2. A rotation drive shaft 42 is provided on each axial end of the first container 1. The aforementioned engagement structure is provided between each rotation drive shaft 42 and the support flange 22 on the corresponding end. The two rotation drive shafts 42 extend collinearly. The reciprocating rotation drive mechanism 4 also includes a rotation drive member 41 connected to one of the rotation drive shafts 42 for driving the rotation drive shaft 42 to rotate about its own axis.

[0065] In this embodiment, the rotary drive shaft 42 can also be adjusted along its own axial position on the first container 1. The engagement structure includes an insertion protrusion 421 and an insertion groove 221 that can be mutually plugged in along the axial direction. The insertion protrusion 421 is provided on the engagement end of the rotary drive shaft 42 and extends protrudingly from the engagement end toward the support flange 22 in the axial direction. The insertion groove 221 is provided on the support flange 22 and is provided along the axial direction of the support flange 22. When the insertion protrusion 421 and the insertion groove 221 are disengaged from each other, there is an axial spacing between the insertion protrusion 421 and the support flange 22. In other embodiments, the insertion groove 221 can also be provided on the engagement end of the rotary drive shaft 42 and the insertion protrusion 421 can be provided on the support flange 22. The two can also be plugged in and engaged in the axial direction to achieve synchronous rotation.

[0066] The linear reciprocating drive mechanism 5 includes a linear drive shaft 52 disposed on the first container 1 and capable of linear motion along its own axis, and a reciprocating linear drive member 51 for driving the linear drive shaft 52 to reciprocate linearly along the axis. The linear drive shaft 52 has a drive end 521 that extends into the leakage medium cavity 10. A coupling seat 23 is fixedly disposed on the outer periphery of the second container body 21. A detachably fixed connection structure is disposed between the coupling seat 23 and the drive end 521. Here, the connection structure is specifically a threaded connection structure. The coupling seat 23 is provided with a threaded hole 231, and the drive end 521 is provided with an external thread. The drive end 521 is threadedly inserted into the threaded hole 231 to achieve engagement between the linear drive shaft 52 and the second container 2.

[0067] See also Figure 5 、 Figure 6 As shown, the first container 1 includes a first hollow cylindrical container body 12 and two end flanges 13 fixedly and sealingly disposed on the axial ends of the first container body 12. The two end flanges 13 are fixedly connected to the axial ends of the first container body 12 by a plurality of bolts 16 spaced apart in the circumferential direction. A first container cavity 11 is formed between the first container body 12 and the two end flanges 13. The inner diameter of the first container body 12 is larger than the outer diameter of the second container 2. The two sealing end surfaces 2a of the second container 2 are sealed to the end flanges 13 on both sides via seals 3. The seals 3 are made of metal or non-metallic material and are flat gaskets, packing rings, or linear sealing rings.

[0068] The inner sides of the two end flanges 13 are provided with guide grooves 131 for radially sliding the second container 2. The second container 2 can rotate relative to its own axis and can slide relative to the radial direction in cooperation with the guide grooves 131 on both sides.

[0069] A first boss 14 extending radially outward is further provided on the outer sides of the two end flanges 13. A first mounting hole 141 is provided on the first boss 14, which extends through and communicates with the first container chamber 11 of the first container 1. The rotary drive shaft 42 of the reciprocating rotary drive mechanism 4 is inserted into the first mounting hole 141. A sealed connection is achieved between the circumferential wall of the first mounting hole 141 and the outer circumferential wall of the rotary drive shaft 42 via a first locking end cap 43 and a first sealing stuffing box 44.

[0070] A heating belt 17 is also provided on the outer circumference of the first container body 12 to assist in heating and regulating the temperature of the medium within the leaking medium cavity 10. A second boss 15 is also fixedly provided on the outer circumference of the first container body 12. This second boss 15 is provided with a second mounting hole 151, which extends through and connects to the first container cavity 11 of the first container 1. The linear drive shaft 52 of the reciprocating linear drive mechanism 5 is inserted into the second mounting hole 151. A sealed connection is achieved between the circumferential wall of the second mounting hole 151 and the outer circumferential wall of the linear drive shaft 52 via a second locking end cap 53 and a second sealing gland 54.

[0071] The outer periphery of the first container 1 is also provided with a sealing medium input hole 132, where the sealing medium input hole 132 is arranged on the end face flange 13 on one side and is interconnected with the first container cavity 11; the outer periphery of the first container 1 is also provided with a leakage hole 121 for communicating with the leakage medium cavity 10, where the leakage hole 121 is arranged at the bottom of the first container body 12.

[0072] When the sealing medium leakage detection system is used to perform friction tests on the sealing surface of the seal 3 under both rotary reciprocating and linear reciprocating conditions to detect the sealing performance of the seal 3 under rotary reciprocating and linear reciprocating conditions, the test can be performed as follows:

[0073] Test 1: Linear reciprocating friction seal performance test:

[0074] The seal 3 is subjected to a friction test under linear reciprocating conditions to detect the effect of linear reciprocating friction on the sealing performance and service life of the seal 3. Figure 7 As shown, you can follow the steps below:

[0075] (1) Function switching:

[0076] The leakage detection device 100 is switched to the second working state, and the rotary drive shafts 42 on both sides are moved outwards to both ends, so that the rotary drive shafts 42 are disengaged from the support flanges 22 .

[0077] (2) Installation of the test object seal 3:

[0078] The linear drive shaft 52 is threadedly connected to the engagement seat 23 on the top of the second container 2. The nut on the bolt 16 is tightened according to the test requirements, and the compression load of the test object seal 3 is controlled as required.

[0079] (3) Test parameter setting:

[0080] The control and data acquisition device 8 sets the test parameters such as the number of reciprocating times, reciprocating stroke, movement speed, running time, test temperature, test pressure, etc. according to the test requirements, and automatically records the relevant data during the test according to the test requirements.

[0081] (4) Heating, pressurization, and constant pressure:

[0082] The pressure and temperature in the sealing medium chamber 20 are brought to the test requirements and maintained constant. Specifically, the control valve 18 is first opened to maintain the leaking medium chamber 10 in a discharge state. The sealing medium supply device 6 is then opened. The temperature and pressure values ​​are fed back to the control and data acquisition device 8 via the second pressure sensor 73 and the second temperature sensor 74 of the data acquisition component 7. The sealing medium is heated and pressurized by adjusting the flow rate of the control valve 64, the power of the heater 63, and the power of the heating belt 17. The pressure in the sealing medium chamber 20 is then maintained constant via the pressure stabilizing valve 19.

[0083] (5) Reciprocating linear motion start:

[0084] The reciprocating linear driving member 51 of the reciprocating linear driving mechanism 5 works, causing the second container 2 to perform linear reciprocating motion in the guide groove 131 in the first container 1, so that the sealing surface of the sealing member 3 and the sealed surface generate linear reciprocating relative displacement friction.

[0085] (6) Seal leakage and service life test:

[0086] After the pressure and temperature in the sealing medium cavity 20 reach the test requirements and remain constant, the leakage detection device 9 is turned on to perform leakage inspection.

[0087] Test 2: Rotary reciprocating friction seal performance test:

[0088] A friction test is performed on the seal 3 under a rotating reciprocating condition to detect the influence of the linear reciprocating friction on the sealing performance and service life of the seal 3 .

[0089] See also Figure 2As shown, first switch the leakage detection device 100 to the first working state, so that the linear drive shaft 52 and the engagement seat 23 are disengaged from each other, and the rotary drive shafts 42 on both sides are respectively engaged with the support flanges 22 at both ends inward. Then repeat steps (2) to (4) in test 1, and then operate the reciprocating rotary drive member 41 of the reciprocating rotary drive mechanism 4, so that the second container 2 rotates around its own axis in the first container cavity 11, so that the sealing surface of the seal 3 and the sealed surface generate rotational reciprocating relative displacement friction. Finally, make the pressure and temperature in the sealing medium cavity 20 reach the test requirements, and after maintaining them constant, open the leakage detection device 9 to perform leakage detection.

[0090] The leakage and service life of the seal 3 can be tested in the following manner:

[0091] 1. The leakage detection of seal 3 is carried out according to the following steps:

[0092] (1) Leakage measurement box 91 is filled with water:

[0093] After the test is completed, the control valve 98 is opened (the control valve 98 remains closed during the test);

[0094] Confirm that the control valve 18 is in the open state (the control valve 18 has been opened before the temperature and pressure are increased, and is in the normally open state before the leakage detection device 9 is turned on);

[0095] Open the control valve 910 to exhaust, open the injection pump 911 and the control valve 912 to fill the leakage measurement box 91 with water, and then close the injection pump 911 and the control valves 910 and 912.

[0096] (2) Introduction of leaked sealing medium:

[0097] Open the cooler 93, open the control valve 98, and start the leakage detection device 9;

[0098] After the temperature and pressure of the sealing medium chamber 20 reach the test requirements and remain constant, the control valve 18 is closed, allowing the leaked sealing medium to pass through the drainage pipe 99 and be cooled by the cooler 93. The leaked sealing medium is then introduced into the leakage measurement box 91. The medium temperature at the outlet of the cooler 93 is lower than the boiling point of the detection liquid in the leakage measurement box 91.

[0099] The outlet temperature is fed back to the control and data acquisition device 8 through the temperature sensor 913 and the efficiency of the cooler 93 is controlled to achieve the control of the outlet temperature;

[0100] After the leaked sealing medium enters the leakage detection box 91 , the liquid level of the leakage detection box 91 drops, and the liquid enters the liquid replenishing tank 94 through the drain pipe 96 .

[0101] (3) Leakage measurement:

[0102] Record the time t1 when the leaked medium is introduced;

[0103] The liquid level height h is measured by the liquid level gauge 92;

[0104] The medium pressure P1 and temperature T1 are measured by the pressure sensor 914 and the temperature sensor 915 respectively.

[0105] (4) Calculation of leakage:

[0106] Conversion formula for the volume of leaked gas sealing medium under standard conditions:

[0107]

[0108] V1=Sh

[0109] △t=t2-t1

[0110] V leakage = V0 / △t

[0111] in:

[0112] P1——pressure of the leaked gas sealing medium in the leakage measurement box 91, in MPa;

[0113] S——cross-sectional area of ​​leakage measurement box 91;

[0114] h - the height of the leaked gas sealing medium;

[0115] V1——the volume of leaked gas, in m3;

[0116] T1——current temperature, unit is K;

[0117] P0 - pressure under standard conditions (fixed value, P0 = 0.101 MPa), unit is MPa;

[0118] T0 - temperature under standard conditions (fixed value, T0 = 20 ° C = 293.15 K), unit is K;

[0119] V0——the volume under standard conditions, in m3;

[0120] t1——measurement start time, unit min;

[0121] t2——measurement end time, unit min;

[0122] V leakage - volume leakage under standard conditions per unit time, unit is m 3 / min.

[0123] 2. Life detection method of seal 3:

[0124] During the friction test, the seal leakage is detected. When the leakage exceeds the allowable leakage, the seal is considered to have failed. The number of reciprocating motions is recorded, and the number of reciprocating motions is the maximum service life.

[0125] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A sealing medium leakage detection system, characterized in that: include: A leakage detection device includes a first container having a sealed first container cavity, and a second container disposed in the first container cavity, wherein the second container has two sealing end surfaces disposed at two different ends in its axial direction, each of the sealing end surfaces being sealingly connected to the inner wall of the first container via a sealing member, and the second container being disposed in the first container cavity so as to be both rotatable about its own axis and movable linearly in its own radial direction, wherein the inner cavity of the second container is sealed by the first container to form a sealed medium cavity, a portion of the first container cavity located on the outer periphery of the second container constituting a leakage medium cavity, and the first container is provided with a leak guide hole interconnected with the leakage medium cavity; a sealing medium supply device, for supplying sealing medium into the sealing medium cavity; A data acquisition component, comprising a first acquisition component for acquiring the pressure and temperature in the leakage medium cavity, and a second acquisition component for acquiring the pressure and temperature in the sealing medium cavity; a leakage detection device for obtaining the leakage amount of the sealing medium flowing out of the leakage hole; A control and data acquisition device, wherein the control and data acquisition device is signal-connected to the sealing medium supply device, the data acquisition component and the leakage detection device. In which, the leakage detection device also includes a reciprocating rotation drive mechanism for driving the second container to rotate around its own axis, and a reciprocating linear drive mechanism for driving the second container to move reciprocatingly in a radial direction. One of the reciprocating rotation drive mechanism and the reciprocating linear drive mechanism is arranged in conjunction with the second container.

2. The sealing medium leakage detection system according to claim 1, characterized in that: The leakage detection device has a first working state and a second working state. When the leakage detection device is in the first working state, the second container and the reciprocating linear drive mechanism are separated from each other, and the second container and the reciprocating rotary drive mechanism are engaged with each other and driven by the reciprocating rotary drive mechanism to rotate around its own axis; when the leakage detection device is in the second working state, the second container and the reciprocating rotary drive mechanism are separated from each other, and the second container and the reciprocating linear drive mechanism are engaged with each other and driven by the reciprocating linear drive mechanism to reciprocate along the radial straight line.

3. The sealing medium leakage detection system according to claim 1, characterized in that: The second container includes a second container body in a hollow cylindrical shape, and a supporting flange fixed in the inner cavity of the second container body. The axial end faces on both sides of the second container body respectively constitute the two sealing end faces. The supporting flange is arranged at a distance from the sealing end faces. A connecting hole is provided on the supporting flange that penetrates along the axial direction. The connecting hole connects to the inner cavity of the second container body. The reciprocating rotation drive mechanism includes a rotating drive shaft that can be rotatably arranged on the first container around its own axis. The rotating drive shaft has a joining end that extends into the sealing medium cavity. A joining structure that is mutually engaged along the axial direction is provided between the joining end and the supporting flange.

4. The sealing medium leakage detection system according to claim 3, characterized in that: The supporting flanges are provided on both axial ends of the second container body, and the two supporting flanges are spaced apart along the axial direction of the second container. The rotating drive shafts are provided on both axial ends of the first container, and the rotating drive shafts can also be slidably provided on the first container along their own axial direction. The engaging structure is provided between the two rotating drive shafts and the supporting flanges at the corresponding ends, and the axial center lines of the two rotating drive shafts extend collinearly. The reciprocating rotating drive mechanism also includes a reciprocating rotating drive member connected to one of the rotating drive shafts.

5. The sealing medium leakage detection system according to claim 4, characterized in that: The coupling structure includes a coupling protrusion and a coupling groove that can be axially matched with each other, wherein the coupling protrusion is arranged on the coupling end and protrudes from the coupling end axially toward the support flange, and the coupling groove is opened on the support flange and is arranged to pass through the support flange axially, wherein when the coupling protrusion and the coupling groove are disengaged from each other, there is an axial distance between the coupling protrusion and the support flange.

6. The sealing medium leakage detection system according to claim 1, characterized in that: The reciprocating linear drive mechanism includes a linear drive shaft that can be arranged on the first container and can move linearly along its own axis. The linear drive shaft has a drive end that extends into the leakage medium cavity. A coupling seat is fixedly provided on the outside of the second container, and a detachably fixed connection structure is provided between the coupling seat and the drive end.

7. The sealing medium leakage detection system according to claim 1, characterized in that: The first container includes a first container body with a hollow cylindrical shape, two end face flanges fixedly and sealingly arranged on the axial ends on both sides of the first container body, and the first container cavity is formed between the first container body and the two end face flanges, wherein the inner diameter of the first container body is larger than the outer diameter of the second container, the first container body and the end face flanges on both sides are connected by a plurality of bolts distributed at circumferential intervals, the two sealing end faces are respectively sealed and connected to the end face flanges on both sides by the sealing members, and a guide groove is provided on the inner side of the end face flange to provide radial sliding guidance for the second container, the second container can both rotate relatively around its own axis and can be arranged to cooperate with the guide grooves on both sides in radial relative sliding, and the leakage hole is provided on the first container body.

8. The sealing medium leakage detection system according to any one of claims 1 to 7, characterized in that: The sealing medium is gas, and the sealing medium supply device includes a gas source tank storing the sealing medium, a booster pump for pressurizing the sealing medium output from the gas source tank, and a heater for heating the pressurized sealing medium.

9. The sealing medium leakage detection system according to any one of claims 1 to 7, characterized in that: The sealing medium is gas, and the leakage detection device includes: A leakage measurement box having a closed detection cavity for storing a detection liquid, a medium inlet being provided at the top of the leakage measurement box, and a liquid outlet being provided at the bottom of the leakage measurement box; a liquid level gauge, used to measure the liquid level of the detection liquid in the leakage measurement box; an air intake assembly disposed between the medium inlet and the leak guide hole, the air intake assembly comprising a drainage pipe connected to the leak guide hole, a cooler having an inlet end connected to the end of the drainage pipe, and an air intake pipe connected between an outlet section of the cooler and the medium inlet; a liquid discharge pipe having a liquid discharge port, the liquid discharge pipe being connected to the liquid outlet and vertically extending upward from the liquid outlet and being higher than the medium inlet; A liquid replenishing device is used to supply the detection liquid into the leakage measurement box.

10. A method for detecting leakage of a sealing medium, characterized in that: Based on the implementation of the sealing medium leakage detection system according to any one of claims 1 to 9, the reciprocating linear drive mechanism is disengaged from the second container and the reciprocating rotary drive mechanism is engaged with the second container and drives the second container to rotate around its own axis, or the reciprocating rotary drive mechanism is disengaged from the second container and the reciprocating linear drive mechanism is engaged with the second container and drives the second container to move in a straight line along its own radial direction, wherein, during the process of the second container rotating around its own axis or moving in a straight line along its own radial direction, the temperature value and pressure value in the sealing medium cavity are always maintained within a preset range.

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