An overlapping intensive static seal test tool and method

Abstract

The present application relates to the technical field of sealing detection, in particular to an overlapping intensive static sealing test tool and method. The overlapping intensive static sealing test tool comprises a box unit and a plurality of shaft units. The box unit comprises a test box and a plug. The test box is provided with a mounting shaft hole, an exhaust hole and an oil injection hole. The plug is used to block the exhaust hole. The shaft unit comprises a test shaft and a sealing ring. The outer circumferential wall of the test shaft is provided with a sealing groove. The sealing ring is installed in the sealing groove. The plurality of shaft units are coaxially nested in a multi-layer annular structure. The sealing ring is extruded between the two adjacent test shafts. An oil storage groove is arranged between the two adjacent test shafts. An oil passage hole is formed in the test shaft. The plurality of oil storage grooves are sequentially communicated through the oil passage hole. The outermost oil storage groove is respectively communicated with the oil injection hole and the exhaust hole through the outermost oil passage hole. Thus, the problem of interference of the adhesion of bubbles on the inner wall of the oil storage groove with the oil sealing detection of the static sealing structure is solved.

Description

Technical Field

[0001] This invention relates to the field of sealing performance testing technology, and more specifically, to an overlapping, integrated static sealing test fixture and method. Background Technology

[0002] With the development of the aerospace industry, the quality and reliability of basic electromechanical products in aviation have attracted increasing attention. As a typical basic electromechanical product, seals are used in multiple systems such as hydraulics, fuel, and environmental control in aircraft. Among them, static seals are one of the most basic but widely used types of seals. Therefore, it is particularly important to conduct component-level tests on static seals before they are installed on the product and tested with the product.

[0003] For example, the working principle of the shaft seal structure relies on the interference fit between the sealing ring and the shaft to form a sealing surface. The sealing performance is tested by filling the oil reservoir on the shaft with oil and maintaining pressure, and then monitoring the oil leakage status to determine whether the sealing performance meets the standard.

[0004] However, during the testing process, air bubbles inevitably remain when oil is injected into the reservoir. These residual air bubbles adhere to the outer circumferential wall of the annular reservoir area, not only occupying oil storage space but also interfering with the monitoring of oil leakage conditions. This can easily lead to "false leaks" or "missed detections," severely affecting the accuracy of the test and failing to provide a reliable basis for the performance evaluation of the shaft seal structure.

[0005] Therefore, the adhesion of air bubbles on the inner wall of the oil storage tank interferes with the oil sealing performance testing of the static sealing structure, which has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0006] To address the problem of air bubbles adhering to the inner wall of the oil storage tank interfering with the oil sealing performance testing of the static sealing structure, this invention provides an overlapping, integrated static sealing test fixture and method.

[0007] In a first aspect, the present invention provides an overlapping, compact static seal test fixture, the overlapping, compact static seal test fixture comprising:

[0008] The housing unit includes a test chamber and a plug; the test chamber is provided with a mounting shaft hole, a vent hole, and an oil filling hole; the vent hole and the oil filling hole are respectively connected to the mounting shaft hole; the line connecting the vent hole and the oil filling hole intersects the axis of the mounting shaft hole; the plug is detachably connected to the test chamber; the plug is used to seal the vent hole;

[0009] Multiple shaft units, each shaft unit including a test shaft and a sealing ring; a sealing groove is provided on the outer circumferential wall of the test shaft; the sealing ring is installed in the sealing groove; the shaft unit is detachably disposed in the mounting shaft hole; the multiple shaft units are coaxially nested in a multi-layer ring structure, with the sealing ring pressed between two adjacent layers of the test shaft; an oil storage tank is provided between two adjacent layers of the test shaft; the oil storage tank extends around the axis of the test shaft; the oil storage tank is at least partially excavated on the inner circumferential side of the test shaft; an oil passage hole is provided on the test shaft; the multiple oil storage tanks are connected sequentially through the oil passage hole; the outermost oil storage tank is connected to the oil injection hole and the vent hole respectively through the outermost oil passage hole.

[0010] Preferably, the oil storage tank includes a first oil tank and a second oil tank; the first oil tank is located on the inner circumference of the test shaft; the second oil tank is located on the outer circumference of the test shaft; the first oil tank and the second oil tank between two adjacent test shafts are connected.

[0011] Preferably, in the test working state, the first oil groove covers at least the semi-circular area above the axis of the test shaft; the second oil groove covers at least the semi-circular area below the axis of the test shaft.

[0012] Preferably, the depth of each first oil tank increases from top to bottom; the depth of each second oil tank decreases from top to bottom.

[0013] Preferably, the depth of the first oil tank is positively correlated with the diameter of the test shaft; the depth of the second oil tank is negatively correlated with the diameter of the test shaft.

[0014] Preferably, the median depth of the plurality of second oil tanks is greater than the median depth of the plurality of first oil tanks.

[0015] Preferably, the number of oil passage holes is positively correlated with the diameter of the test shaft.

[0016] Preferably, the overlapping, integrated static sealing test fixture further includes:

[0017] An oil level detector is disposed within the mounting shaft hole; the oil level detector is located on the outside of the test shaft; a sealing ring is located between the oil level detector and the oil reservoir.

[0018] The oil detector corresponds one-to-one with the shaft unit; the oil detector is located at the bottom position of the test shaft in the circumferential direction.

[0019] Preferably, the overlapping, integrated static sealing test fixture further includes:

[0020] A micro switch is disposed within the mounting shaft hole; the micro switch is located on the outside of the test shaft; a sealing ring is located between the micro switch and the oil reservoir.

[0021] Each micro switch corresponds to one of the shaft units; the micro switch is located at the top position of the test shaft in the circumferential direction.

[0022] Secondly, the present invention provides an overlapping, compact static seal test method, wherein the overlapping, compact static seal test method is applied to the overlapping, compact static seal test fixture described in any embodiment of the first aspect, and the overlapping, compact static seal test method includes:

[0023] The shaft unit and the housing unit are assembled.

[0024] The housing unit is placed in a preset posture so that the vent of the test housing is above the oil injection hole, and the oil storage tank excavated on the inner circumference of the test shaft at least covers the semi-circular area above the axis of the test shaft.

[0025] Connect the oil pump outlet to the oil injection hole and open the vent hole;

[0026] Turn on the oil pump until the oil in the test chamber flows out from the vent, then close the vent.

[0027] When the oil pressure reaches the threshold, the oil pump is controlled to maintain pressure for a preset time.

[0028] To obtain information on oil leakage during the oil pressure holding period.

[0029] To address the problem of air bubbles adhering to the inner wall of the oil storage tank interfering with the oil sealing performance testing of the static sealing structure, this invention has the following advantages:

[0030] Multiple shaft units are coaxially nested in the mounting holes of the test chamber to form a multi-layered annular structure, creating a sealing surface between the outer peripheral wall of the sealing ring and the test shaft. An oil reservoir is installed between adjacent test shafts, with at least a portion of the reservoir excavated into the inner circumference of the test shaft. This ensures that, in the area above the horizontal plane where the test shaft's axis lies, the projection of the sealing surface along the test shaft's axial direction is located within the oil reservoir, and the radius of the sealing surface's projection is smaller than the maximum radius of the oil reservoir. In other words, the height of any position on the sealing surface is lower than the maximum height of the oil reservoir area at the same horizontal level. During the process of injecting oil from the injection hole upwards into the fixture, the gas in the oil reservoir, due to its lower density than the oil, moves upwards, allowing most or all of the gas to move to the area above the test shaft's axis. Even if a small number of air bubbles adhere to the outer peripheral wall of the oil reservoir, the sealing surface is lower than the outer peripheral wall of the oil reservoir, making it difficult for air bubbles to leak from a lower position, thus minimizing interference from air bubble leakage in the oil leakage test. This invention not only enables centralized and synchronous testing of multiple static sealing structures, improving testing efficiency, but also effectively enhances the accuracy and reliability of sealing performance testing. Attached Figure Description

[0031] Figure 1 A schematic diagram of the overlapping, compact static sealing test fixture of Embodiment 1 is shown;

[0032] Figure 2 A schematic diagram of the shaft unit and sealing cover of Embodiment 1 is shown;

[0033] Figure 3 A cross-sectional view of the overlapping, compact static seal test fixture of Embodiment 1 is shown, with the cutting plane parallel to the axis of the shaft unit;

[0034] Figure 4 A cross-sectional view of the overlapping, compact static seal test fixture of Embodiment 1 is shown, with the cutting plane perpendicular to the axis of the shaft unit;

[0035] Figure 5 A cross-sectional view of the test shaft of Embodiment 1 is shown, with the cutting plane perpendicular to the axis of the test shaft;

[0036] Figure 6 A flowchart of the overlapping, intensive static sealing test method of Example 2 is shown.

[0037] Reference numerals: 10 Box unit; 11 Test box; 111 Mounting shaft hole; 112 Vent hole; 113 Oil filling hole; 12 Sealing cover; 13 Oil detector; 14 Micro switch; 20 Shaft unit; 21 Test shaft; 22 Sealing groove; 23 Oil passage hole; 24 Sealing ring; 25 Oil reservoir; 251 First oil reservoir; 252 Second oil reservoir. Detailed Implementation

[0038] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, and are not intended to imply any limitation on the scope of the disclosure.

[0039] As used herein, the term "comprising" and its variations are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "at least partially based on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments and are not intended to limit the indicated devices, elements, or components to having a specific orientation or being constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientations or positional relationships; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances. In addition, the terms "installed", "set up", "equipped with", "connected", and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Furthermore, the terms "first," "second," etc., are mainly used to distinguish different devices, elements, or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0040] To address the problem of air bubbles adhering to the inner wall of the oil storage tank 25 interfering with the oil sealing performance testing of the static sealing structure, this invention provides an overlapping, integrated static sealing test fixture and method.

[0041] Example 1:

[0042] This embodiment provides an overlapping, compact static sealing test fixture, such as... Figure 1 and Figure 2 As shown, an overlapping, intensive static sealing test fixture includes a housing unit 10 and multiple shaft units 20.

[0043] The housing unit 10 includes a test chamber 11 and a plug; the test chamber 11 is provided with a mounting shaft hole 111, a vent hole 112, and an oil filling hole 113; the vent hole 112 and the oil filling hole 113 are respectively connected to the mounting shaft hole 111; the line connecting the vent hole 112 and the oil filling hole 113 intersects the axis of the mounting shaft hole 111; the plug is detachably connected to the test chamber 11; the plug is used to seal the vent hole 112. During the test, the test chamber 11 moves along... Figure 3 As shown, the test chamber 11 is placed vertically, with the vent 112 located at the top and the oil filling hole 113 located at the bottom. In some embodiments, the plug is connected to the test chamber 11 by a thread or other conventional connection method such as an interference fit to achieve sealing.

[0044] The shaft unit 20 includes a test shaft 21 and a sealing ring 24. A sealing groove 22 is provided on the outer circumferential wall of the test shaft 21. The sealing ring 24 is installed in the sealing groove 22. The shaft unit 20 is detachably disposed in the mounting shaft hole 111. Multiple shaft units 20 are coaxially nested in a multi-layer annular structure, with the sealing ring 24 pressed between two adjacent layers of test shafts 21. An oil reservoir 25 is provided between two adjacent layers of test shafts 21. The outer circumferential surface of each sealing ring 24 is fitted with the inner circumferential surface of one of the test shafts 21 to form a sealing surface. The oil reservoir 25 extends around the axis of the test shaft 21. In this preferred embodiment, the extension trajectory of the oil reservoir 25 is annular.

[0045] In this embodiment, two sets of shaft units 20 are provided, and two mounting shaft holes 111 are provided on the test chamber 11. The shaft units 20 are arranged one-to-one with the mounting shaft holes 111. The chamber unit 10 also includes multiple sealing covers 12, which cooperate with the mounting shaft holes 111. Two sealing covers 12 are installed on both sides of the shaft unit 20 in the axial direction, so as to fix the shaft unit 20 and isolate the internal environment of the test chamber 11 from the outside.

[0046] The oil reservoir 25 is at least partially excavated on the inner circumference of the test shaft 21. In the area above the horizontal plane where the axis of each shaft unit 20 is located, the maximum height of the oil reservoir 25 is the height of the outer diameter circumferential wall of the oil reservoir 25, so that the height of the sealing surface at any position in this area is lower than the maximum height of the oil reservoir 25 area at the same horizontal position. An oil passage hole 23 is provided on the test shaft 21; multiple oil reservoirs 25 are connected sequentially through the oil passage hole 23; the outermost oil reservoir 25 is connected to the oil injection hole 113 and the vent hole 112 through the outermost oil passage hole 23 respectively.

[0047] By injecting oil into the oil injection hole 113, the injected oil can be used for leak testing, etc. The oil then flows along... Figure 3As shown, the oil gradually flows from bottom to top into the oil passage 23 and the multi-layered oil reservoir 25. Under ideal conditions where the sealing performance meets the standards, a small portion of the oil may flow into the sealing position and reach the sealing groove 22, but it will be blocked by the tightly compressed sealing ring 24, thus preventing leakage. Subsequently, the amount of oil increases until most of the gas in the oil passage 23 and the oil reservoir 25 is driven out through the vent hole 112. Since the density of gas is lower than that of oil, it has an upward tendency, allowing the gas in the oil reservoir 25 located below the central axis of the test shaft 21 to move upward along the annular outer circumference of the test shaft 21 until most of it is discharged through the vent hole 112. This allows the sealing performance of the internal structure of the test chamber 11 to be tested.

[0048] By optimizing the structure of the oil storage tank 25, it is possible to achieve the following: Figure 3 The height of each sealing position in the vertical cross-section shown is lower than the maximum height of the cross-sectional area of ​​the oil reservoir 25 at the same horizontal position. This ensures that even if air bubbles adhere to the outer circumferential wall of the oil reservoir 25 during the oil sealing test, they are less likely to leak from the lower sealing surface due to their higher height. This minimizes the interference of gas in the test chamber 11 on the oil sealing test, resulting in high accuracy and reliability of the sealing test.

[0049] In this embodiment, the oil storage tank 25 can be formed after processing or it can be integrally formed with the test shaft 21.

[0050] Furthermore, such as Figure 4 As shown, the oil reservoir 25 includes a first oil reservoir 251 and a second oil reservoir 252; the first oil reservoir 251 is located on the inner circumferential side of the test shaft 21; the second oil reservoir 252 is located on the outer circumferential side of the test shaft 21; the first oil reservoir 251 and the second oil reservoir 252 between adjacent test shafts 21 are connected. In this embodiment, the oil reservoir 25 is partially located on the inner circumferential side of one of the test shafts 21 and partially located on the outer circumferential side of the other test shaft 21; by opening a portion of the oil reservoir 25 on the outer circumferential side of the test shaft 21, the highest point of any location of the oil reservoir 25 in the region below the axis of the test shaft 21 is located on the inner circumferential wall of the oil reservoir 25. It should be understood that the inner circumferential wall of the oil reservoir 25 is the inner wall of the second oil reservoir 252 opened on the outer circumferential side of the test shaft 21.

[0051] By separating the first oil tank 251 and the second oil tank 252 on opposite sides, the oil storage tanks 25 between the two adjacent test shafts 21 form a complementary structure, avoiding the spatial limitations of a single oil tank. Furthermore, with the first oil tank 251 and the second oil tank 252 connected, the oil can flow more smoothly between the two test shafts 21, reducing dead zones where air can accumulate. By separately arranging the first oil tank 251 and the second oil tank 252 on the inner and outer sides of the test shaft 21, the highest point of most areas of the oil storage tank 25 can be higher than the corresponding sealing surface in the horizontal direction, making it less likely for air bubbles to leak from lower positions. This utilizes the characteristic that air bubbles tend to move upwards, keeping them away from the sealing surface and reducing the impact of air bubbles on the oil sealing performance of the test fixture.

[0052] Further, refer to Figure 3 and Figure 4 In the test operation state, the first oil groove 251 of the shaft unit 20 covers at least the semi-circular area above the axis of the test shaft 21; the second oil groove 252 covers at least the semi-circular area below the axis of the test shaft 21. Therefore, the central angles of the areas covered by the first oil groove 251 and the second oil groove 252 in the circumferential direction of the test shaft 21 are both greater than 180°; in this embodiment, the structure of the oil storage groove 25 is more symmetrical. Combining the above arrangement with the test posture of the oil injection hole 113 at the bottom and the vent hole 112 at the top, the second oil groove 252 located below the axis of the shaft unit 20 can preferentially store oil and push the gas upward. The first oil groove 251 above the axis of the shaft unit 20 receives the rising oil and gas, keeping the air bubbles away from the sealing surface and greatly reducing the probability of air bubble residue. This structurally solves the problem of air bubble residue interfering with oil sealing detection in the airtightness testing fixture.

[0053] Furthermore, such as Figure 5 As shown, the depth of each first oil groove 251 increases from top to bottom; the depth of each second oil groove 252 decreases from top to bottom. In this preferred embodiment, the first oil groove 251 is annular, covering a central angle of 360° around the test shaft 21. The second oil groove 252 is also annular, covering a central angle of 360° around the test shaft 21. Therefore, the oil reservoir 25 is annular, and its axis is offset from the axis of the shaft unit 20, meaning there is a gap between them. This minimizes the opening volume of the oil reservoir 25, improves the structural strength of the shaft unit, and simultaneously ensures that the height of any position on the sealing surface is lower than the maximum height of the oil reservoir 25 area at the same horizontal level.

[0054] In another embodiment, the axis of the shaft unit 20 coincides with the axis of the oil reservoir 25, and both the first oil reservoir 251 and the second oil reservoir 252 are annular. Thus, the machining difficulty of the first oil reservoir 251 and the second oil reservoir 252 is reduced by sacrificing the structural strength of the shaft unit 20. Further, as... Figure 4 and Figure 5 As shown, the depth of the first oil tank 251 is positively correlated with the diameter of the test shaft 21; the depth of the second oil tank 252 is negatively correlated with the diameter of the test shaft 21. Since multiple test shafts 21 are coaxially nested, the test shaft 21 with a larger diameter has a longer circumference, requiring a deeper second oil tank 252 to ensure better oil flow. Furthermore, the first oil tank 251 at least covers the semi-circular area below the axis of the test shaft 21, and the second oil tank 252 at least covers the semi-circular area above the axis of the test shaft 21. The flow resistance is negatively correlated with the depth of the oil tank 25, thus ensuring that the flow resistance decreases approximately in the direction of oil flow (i.e., from bottom to top), guaranteeing orderly and smooth oil flow.

[0055] Furthermore, such as Figure 5 As shown, the median depth of the multiple second oil tanks 252 is greater than the median depth of the multiple first oil tanks 251. The flow resistance generally decreases along the flow direction of the oil (i.e., from bottom to top). Compared to a continuous decrease, this invention, by comparing median values, avoids the problem of manufacturing difficulties caused by a limited number of oil tank depth gradient settings when considering the strength of the test shafts 21 when there are a large number of test shafts 21.

[0056] Furthermore, such as Figure 4 and Figure 5 As shown, the number of oil passage holes 23 is positively correlated with the diameter of the test shaft 21. Larger diameter test shafts 21 correspond to larger oil reservoirs 25, requiring more oil passage holes 23 to ensure smooth oil flow. This minimizes the problems of slow oil filling and incomplete air bubble removal during testing of large-diameter shafts. Smaller diameter test shafts 21 have smaller oil reservoirs 25, so a smaller number of oil passage holes 23 are sufficient for oil flow. Reducing the number of oil passage holes 23 prevents the shaft from becoming less rigid due to excessive openings, and prevents shaft deformation during testing from affecting the sealing test results.

[0057] Furthermore, such as Figure 3 As shown, the overlapping integrated static sealing test fixture also includes an oil detector 13, which is installed in the mounting shaft hole 111; the oil detector 13 is located on the outside of the test shaft 21; and the sealing ring 24 is located between the oil detector 13 and the oil reservoir 25.

[0058] The oil detector 13 corresponds one-to-one with the shaft unit 20; the oil detector 13 is located at the bottom of the test shaft 21 in the circumferential direction. Because air bubbles are more thoroughly eliminated at the bottom, the presence of oil leakage in the test fixture can be accurately determined by the reaction of the oil detector 13 after the oil comes into contact with it. In other words, the setting of the oil detector 13 provides a basis for judging whether the test fixture is leaking oil.

[0059] Furthermore, such as Figure 3 As shown, the overlapping integrated static sealing test fixture also includes a micro switch 14, which is installed in the mounting shaft hole 111; the micro switch 14 is located on the outside of the test shaft 21; and the sealing ring 24 is located between the micro switch 14 and the oil reservoir 25.

[0060] Microswitches 14 correspond one-to-one with shaft units 20; microswitches 14 are located at the top of the test shaft 21 in the circumferential direction. Since gas is expelled upwards during oil injection, by installing microswitches 14 on the sealing surface of the sealing ring 24 away from the oil reservoir 25, gas leakage to the outside of the sealing ring 24 and triggering the microswitches 14 can be detected in a timely manner, thus indicating a defect in the test fixture that allows gas leakage. This further verifies whether air bubble leakage interferes with the oil seal detection.

[0061] Example 2:

[0062] This embodiment provides an overlapping, compact static seal test method, which is applied to any of the overlapping, compact static seal test fixtures in Embodiment 1. For example... Figure 6 As shown, an overlapping, intensive static sealing test method includes steps S10-S60, which are described in detail below:

[0063] Step S10: Assemble the shaft unit 20 and the housing unit 10;

[0064] Step S20: Place the housing unit 10 in a preset posture so that the vent 112 of the test box 11 is above the oil injection hole 113, and the oil storage tank 25 excavated on the inner circumference side of the test shaft 21 at least covers the semi-circular area above the axis of the test shaft 21.

[0065] Step S30: Connect the oil pump outlet to the oil filling hole 113 and open the vent hole 112;

[0066] Step S40: Turn on the oil pump until the oil in the test chamber 11 flows out of the vent 112, then close the vent 112; at this time, continue to inject oil, and the oil pressure will rise.

[0067] Step S50: When the oil pressure reaches the threshold, control the oil pump to maintain pressure for the preset duration;

[0068] Step S60: Obtain information on oil leakage during the oil pressure holding period.

[0069] This allows the oil reservoir 25 and the oil injection hole 113 to be filled with oil by injecting oil from below while air bubbles rise to the surface, ultimately determining whether there is any oil leakage in the test fixture.

[0070] In other embodiments, when all the oil reservoirs 25 are located on the inner circumference of the test shaft 21, the processing difficulty is low, the processing cost is low, and it can ensure that the height of the top of each oil reservoir 25 is higher than the top of the outer circumference of the sealing ring 24 at the same layer.

[0071] Those skilled in the art will understand that the above embodiments are specific examples of implementing this disclosure, and in practical applications, various changes can be made in form and detail without departing from the scope of this disclosure.

Claims

1. An overlapping, intensive static sealing test fixture, characterized in that, The overlapping, integrated static sealing test fixture includes: The housing unit includes a test chamber and a plug; the test chamber is provided with a mounting shaft hole, a vent hole, and an oil filling hole; the vent hole and the oil filling hole are respectively connected to the mounting shaft hole; the line connecting the vent hole and the oil filling hole intersects the axis of the mounting shaft hole; the plug is detachably connected to the test chamber; the plug is used to seal the vent hole; Multiple shaft units, each shaft unit including a test shaft and a sealing ring; a sealing groove is provided on the outer circumferential wall of the test shaft; the sealing ring is installed in the sealing groove; the shaft unit is detachably disposed in the mounting shaft hole; the multiple shaft units are coaxially nested in a multi-layer ring structure, with the sealing ring pressed between two adjacent layers of the test shaft; an oil storage tank is provided between two adjacent layers of the test shaft; the oil storage tank extends around the axis of the test shaft; the oil storage tank is at least partially excavated on the inner circumferential side of the test shaft; an oil passage hole is provided on the test shaft; the multiple oil storage tanks are connected sequentially through the oil passage hole; the outermost oil storage tank is connected to the oil injection hole and the vent hole respectively through the outermost oil passage hole.

2. The overlapping, intensive static sealing test fixture according to claim 1, characterized in that, The oil storage tank includes a first oil tank and a second oil tank; the first oil tank is located on the inner circumference of the test shaft; the second oil tank is located on the outer circumference of the test shaft; the first oil tank and the second oil tank between two adjacent test shafts are connected.

3. The overlapping, intensive static sealing test fixture according to claim 2, characterized in that, When the shaft unit is in the test working state, the first oil groove covers at least the semi-circular area above the axis of the test shaft; the second oil groove covers at least the semi-circular area below the axis of the test shaft.

4. The overlapping, intensive static sealing test fixture according to claim 3, characterized in that, The depth of each of the first oil tanks increases from top to bottom; the depth of each of the second oil tanks decreases from top to bottom.

5. The overlapping, intensive static sealing test fixture according to claim 3, characterized in that, The depth of the first oil tank is positively correlated with the diameter of the test shaft; the depth of the second oil tank is negatively correlated with the diameter of the test shaft.

6. The overlapping, intensive static sealing test fixture according to claim 5, characterized in that, The median depth of the plurality of second oil tanks is greater than the median depth of the plurality of first oil tanks.

7. The overlapping, intensive static sealing test fixture according to claim 1, characterized in that, The number of oil passage holes is positively correlated with the diameter of the test shaft.

8. The overlapping, intensive static sealing test fixture according to claim 1, characterized in that, The overlapping, integrated static sealing test fixture also includes: An oil level detector is disposed within the mounting shaft hole; the oil level detector is located on the outside of the test shaft; a sealing ring is located between the oil level detector and the oil reservoir. The oil detector corresponds one-to-one with the shaft unit; the oil detector is located at the bottom position of the test shaft in the circumferential direction.

9. The overlapping, intensive static sealing test fixture according to claim 1, characterized in that, The overlapping, integrated static sealing test fixture also includes: A micro switch is disposed within the mounting shaft hole; the micro switch is located on the outside of the test shaft; a sealing ring is located between the micro switch and the oil reservoir. Each micro switch corresponds to one of the shaft units; the micro switch is located at the top position of the test shaft in the circumferential direction.

10. A method for testing an overlapping, compact static seal, applied to the overlapping, compact static seal testing fixture described in any one of claims 1-9; characterized in that, The method includes: The shaft unit and the housing unit are assembled. The housing unit is placed in a preset posture so that the vent of the test housing is above the oil injection hole, and the oil storage tank excavated on the inner circumference of the test shaft at least covers the semi-circular area above the axis of the test shaft. Connect the oil pump outlet to the oil injection hole and open the vent hole; Turn on the oil pump until the oil in the test chamber flows out from the vent, then close the vent. When the oil pressure reaches the threshold, the oil pump is controlled to maintain pressure for a preset time. To obtain information on oil leakage during the oil pressure holding period.

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