Auxiliary power unit oil drain valve test equipment

Abstract

This application discloses a testing device for an auxiliary power unit oil removal valve, relating to the field of aircraft oil removal valve testing technology. It includes: a base; a housing, the housing being disposed on the base, the housing having an inner cavity; the housing having an inlet connection portion and an outlet connection portion, the outlet connection portion being used for a sealed connection with the outlet of the oil removal valve, and the inlet connection portion being used for a sealed connection with the inlet mesh of the oil removal valve. This utility model adopts a modular design, reducing potential failure points, lowering maintenance costs, and improving the adaptability of the equipment, enabling it to meet the testing needs of oil removal valves of different models and specifications.

Description

Technical Field

[0001] This application relates to the field of aircraft oil removal valve testing technology, and in particular to an auxiliary power unit oil removal valve testing device. Background Technology

[0002] In the auxiliary power unit (APU), the shunting valve is a critical sensor. Its function is to control the airflow into the lubricating oil pump during APU startup and shutdown to optimize startup performance and reduce startup load. It is a two-way, single-coil normally closed valve, and its structural design and functional characteristics make its testing an important topic in the field of aircraft electrical component testing.

[0003] Currently, there are two common methods for testing APU oil removal valves: one is to test them during APU commissioning, where the valve is installed on the APU for actual operational testing; the other is a manual testing method, which mainly relies on electrical signal testing and cannot perform functional tests such as internal leakage and pull-in voltage. Traditional testing methods typically use general-purpose vises and handheld sensors for temporary testing. This approach has many problems, severely limiting the testing efficiency and accuracy of aircraft oil removal valves, increasing the workload of testing personnel, and potentially causing unnecessary damage to precision parts.

[0004] Therefore, there is an urgent need to develop a special testing fixture for degreasing valves that can achieve fast and accurate clamping, integrate standard quick-connect air circuit interfaces, support functional testing, and ensure high-pressure airtightness through end-face sealing structure, thereby improving testing efficiency, reducing labor intensity, and protecting precision parts. Utility Model Content

[0005] To address the aforementioned technical problems, this application proposes an auxiliary power unit (APU) degreasing valve testing device, which can perform rapid clamping and modular testing of APU degreasing valves, solving the problems of low efficiency, poor accuracy, and cumbersome operation of existing testing methods.

[0006] To achieve the above objectives, embodiments of this application provide an auxiliary power unit oil removal valve testing device, comprising: Base; A housing, the housing being disposed on the base, the housing having an inner cavity; The housing is provided with an air inlet connection part and an air outlet connection part. The air outlet connection part is used to seal and connect with the air outlet of the oil removal valve, and the air inlet connection part is used to seal and connect with the air inlet mesh of the oil removal valve.

[0007] Furthermore, the air inlet connection portion is located on the side of the housing, and the air outlet connection portion is located at the end of the housing away from the base.

[0008] Furthermore, both the air inlet docking section and the air outlet docking section are equipped with connecting joints at their ends for quick connection with external air source equipment.

[0009] Furthermore, the base is provided with an installation edge, and the installation edge is provided with a positioning component. The positioning component includes a positioning hole and a positioning pin. The positioning pin is inserted into the positioning hole and is used to cooperate with the oil removal valve mounting flange for positioning.

[0010] Furthermore, the concentricity tolerance between the positioning hole and the positioning hole on the oil removal valve mounting flange is 0.05mm~0.15mm.

[0011] Furthermore, the number of positioning holes is at least two, and the positioning holes are symmetrically arranged along the central axis of the base.

[0012] Furthermore, it also includes a sealing assembly, which includes a sealing groove and an elastic sealing ring. The sealing groove is disposed on the mating surface of the air inlet docking part and the air outlet docking part with the oil removal valve, and the elastic sealing ring is embedded in the sealing groove.

[0013] Furthermore, the sealing assembly includes a first sealing assembly and a second sealing assembly. The first sealing assembly is disposed at one end of the inner cavity of the housing near the air outlet docking portion, and the second sealing assembly is disposed at one end of the inner cavity of the housing near the base. The inner diameter of the inner cavity of the housing is clearance-fitted with the outer diameter of the oil removal valve air inlet mesh.

[0014] Furthermore, the elastic sealing ring is either a fluororubber O-ring or a silicone rubber O-ring.

[0015] Furthermore, both the air inlet and the air outlet are cylindrical connectors with a diameter of 10mm to 20mm and a length of 25mm to 35mm.

[0016] Therefore, the modular design adopted in this application reduces potential failure points and maintenance costs, while improving the adaptability of the equipment to meet the testing needs of different models and specifications of oil removal valves. The integrated dual quick-connect air path improves efficiency by 90% compared to traditional threaded connections; end-face sealing and O-rings solve the problem of easy leakage in threaded seals, ensuring accurate testing of minor leaks; the quick-clamping pin design, borrowing from the positioning pin fixing method, uses positioning pins to quickly fix the testing equipment for clamping; the modular design allows for independent replacement of sealing components on the testing equipment base, facilitating maintenance.

[0017] The above description is merely an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0018] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is a schematic diagram of the structure of the auxiliary power unit oil removal valve testing equipment provided in the embodiments of this application; Figure 2 This is a front view of the auxiliary power unit oil removal valve testing equipment provided in the embodiments of this application; Figure 3 This is a rear view of the auxiliary power unit oil removal valve testing equipment provided in the embodiments of this application; Figure 4 This is a top view of the auxiliary power unit oil removal valve testing equipment provided in the embodiments of this application; Figure 5 This is a bottom view of the auxiliary power unit oil removal valve testing equipment provided in the embodiments of this application; Figure 6 This is a schematic diagram of the structure of the oil removal valve provided in the embodiment of this application.

[0019] Figure label: 1-Outlet connection part, 2-Inlet connection part, 3-Base, 4-Positioning hole, 5-Outlet of oil removal valve, 6-Modifier mounting flange, 7-Electrical plug, 8-Inlet mesh of oil removal valve. Detailed Implementation

[0020] The accompanying drawings, which describe the embodiments of this application in detail below, provide a clear and complete description of the technical solutions in these embodiments. Obviously, the described embodiments are merely some, not all, of the embodiments described in this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0021] In the description of this application, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more. In the description of this application, the term "comprising" and its variations are open-ended, meaning "including but not limited to." The term "based on" means "at least partially based on." The term "according to" means "at least partially according to." The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments."

[0022] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meanings of the above in this application based on the specific circumstances.

[0023] In the description of this application, it should be noted that, unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this specification is for the purpose of describing specific embodiments only and is not intended to limit the application. Those skilled in the art can understand the specific meanings of the above terms in this application based on the specific circumstances.

[0024] See Figures 1 to 5 The diagram shows a structural schematic of an auxiliary power unit oil removal valve testing device according to an embodiment of this application. The auxiliary power unit oil removal valve testing device includes: Base 3; The housing is mounted on the base 3 and has an inner cavity; The housing is provided with an air inlet docking part 2 and an air outlet docking part 1. The air outlet docking part 1 is used to seal and connect with the air outlet 5 of the oil removal valve, and the air inlet docking part 2 is used to seal and connect with the air inlet mesh 8 of the oil removal valve.

[0025] Specifically, the auxiliary power unit oil removal valve testing equipment provided in this embodiment is applicable to the testing of oil removal valves on the APS5000 auxiliary power unit of the Airbus A500 series aircraft. This auxiliary power unit oil removal valve testing equipment can also be applied to the testing of oil removal valves on other aircraft models or other types of auxiliary power units.

[0026] The base 3 is the basic support component of the auxiliary power unit oil removal valve testing equipment. The base 3 can be made of metal, such as aluminum alloy, stainless steel, or carbon steel. Alternatively, it can be made of non-metallic materials with sufficient strength and rigidity, such as engineering plastics.

[0027] See Figure 1 and Figure 4 The base 3 is elliptical in flange shape. The base 3 has a mounting edge along its outer perimeter, and positioning holes 4 are provided on the mounting edge. The positioning holes 4 are used to fix the base 3 to the test platform. The number of positioning holes 4 can be one, two, or more. See also... Figure 4 In an optional embodiment, there are two positioning holes 4. The two positioning holes 4 are symmetrically arranged along the central axis of the base 3, and bolts or positioning pins can be inserted into the positioning holes 4 to achieve a fixed connection between the base 3 and the degreasing valve to be tested. The central area of ​​the base 3 is provided with an upwardly protruding mounting part, which is cylindrical or approximately cylindrical.

[0028] See Figure 1 The housing is mounted on the base 3 and can be made of metal or engineering plastic. The housing and base 3 can be integrally formed or separate structures, and are fixed to the base 3 by welding, threaded connection, or snap-fit ​​connection. The housing is a stepped cylindrical shape, including a large-diameter section at the bottom and a small-diameter section at the top. The large-diameter section is clearance-fitted with the mounting part of the base 3, and the small-diameter section is used to set the air outlet docking part 1.

[0029] See Figure 1 and Figure 6 The housing has an internal cavity for accommodating the oil removal valve inlet mesh 8. The shape and size of the cavity are fitted with the oil removal valve inlet mesh 8 with clearance. The cavity is located in the lower part of the housing and is cylindrical. Sealing components are provided at both the end of the cavity near the outlet connection part 1 and the end near the base 3. A sealing component is also provided at the junction of the upper end face of the cavity and the upper end face of the oil removal valve inlet mesh 8. A sealing component is also provided at the junction of the lower end face of the cavity and the lower end face of the oil removal valve inlet mesh 8. This double-end sealing structure ensures the airtightness of the test air path and prevents gas leakage from the lateral gaps of the oil removal valve inlet mesh 8.

[0030] In an optional embodiment, the air inlet docking part 2 is disposed on the side of the housing, and the air outlet docking part 1 is disposed at the end of the housing away from the base 3.

[0031] Specifically, the side of the housing is provided with an air intake docking part 2, which is fixed to the housing by welding or threaded connection. The air intake docking part 2 is a cylindrical connector, and its central axis is perpendicular to the central axis of the housing. An air intake channel is provided inside the air intake docking part 2. The air intake channel is connected to the internal air passage of the housing.

[0032] See Figure 1 and Figure 3 The air inlet connector 2 protrudes from the side surface of the housing. An interface is provided at the end of the air inlet connector 2 for connecting to an external air source device. The dimensions of the air inlet connector 2 can be adapted to the specifications of the oil removal valve to be tested. The air outlet connector 1 is located at the end of the housing away from the base 3. The air outlet connector 1 is a cylindrical connector, and its central axis coincides with the central axis of the housing. An air outlet channel is provided inside the air outlet connector 1. The air outlet channel is connected to the air passage inside the housing. The air outlet connector 1 is located at the top of the housing, protruding from the upper end face of the housing. An interface is provided on the end face of the air outlet connector 1. This interface is used for connecting to an external air source device and testing instruments. The dimensions of the air outlet connector 1 can be the same as the air inlet connector 2, or can be independently set according to the specifications of the oil removal valve to be tested.

[0033] In an optional embodiment, both the inlet docking part 2 and the outlet docking part 1 are provided with connecting joints at their ends for quick connection with external air source equipment.

[0034] Specifically, the connection connector can adopt a standard quick-connect pneumatic interface. The quick-connect pneumatic interface refers to the standard quick-connect pneumatic interface located at the air inlet connection part 2 and the air outlet connection part 1, used for quick plug-and-play connection with external air sources or the air hoses of testing instruments. For example, the standard quick-connect pneumatic interface can be one of a pneumatic quick-connect connector, a self-locking quick-connect connector, or an insert-type quick-connect connector. Testers do not need to use tools; simply inserting the air hose completes the pneumatic connection. When using a quick-connect interface, testers do not need to use tools; simply inserting the air hose completes the pneumatic connection, making operation simple and efficient. This interface can also be a threaded interface, which can achieve a sealed pneumatic connection by setting a sealing gasket. During testing, no tools are required; simply inserting the air hose completes the connection. Pneumatic switching time is reduced by more than 90%, supporting functional tests such as internal leakage and pull-in voltage. This overcomes the limitation of existing tooling that only supports electrical signal testing, realizing the integration of multi-functional testing and comprehensively evaluating the performance of the oil removal valve.

[0035] In an optional embodiment, the base 3 is provided with a mounting edge, and the mounting edge is provided with a positioning component. The positioning component includes a positioning hole 4 and a positioning pin. The positioning pin is inserted into the positioning hole 4 and is used to cooperate with the positioning hole on the oil removal valve mounting flange 6.

[0036] See Figure 1 and Figure 4The base 3 is equipped with a positioning component. This component is used to position the oil-removing valve under test, enabling rapid clamping of the testing equipment. The positioning component includes positioning holes 4 and positioning pins. Positioning holes 4 are located on the mounting edge of the base 3, and there are at least two positioning holes 4. Positioning pins are inserted into the positioning holes 4, and are detachably connected to them. The diameter of the positioning pin matches the diameter of the positioning hole on the oil-removing valve mounting flange 6. By simultaneously inserting the positioning pin into both the positioning hole 4 on the base 3 and the positioning hole on the oil-removing valve mounting flange 6, rapid and accurate positioning of the testing equipment and the oil-removing valve under test is achieved. The positioning pin can be a cylindrical pin, a tapered pin, or a diamond-shaped pin. The positioning pin can be made of metal, such as stainless steel, tool steel, or alloy steel. The surface of the positioning pin can be hardened to improve its wear resistance.

[0037] In an optional embodiment, the concentricity tolerance between the positioning hole 4 and the positioning hole on the degreasing valve mounting flange 6 is 0.05mm to 0.15mm.

[0038] Specifically, the concentricity tolerance between the positioning hole 4 and the positioning hole on the mounting flange 6 of the degreasing valve is 0.05mm to 0.15mm. For example, the concentricity tolerance can be 0.05mm, 0.08mm, 0.10mm, 0.12mm, or 0.15mm, with 0.10mm being the preferred value. Using the above-mentioned concentricity tolerance range ensures the repeatability of the clamping between the testing equipment and the degreasing valve under test, improving the reliability of the test results. The modular design, using dedicated quick-release positioning pins with the same diameter as the mounting edge holes, achieves rapid and precise clamping, overcoming the problems of poor repeatability and arbitrary clamping in traditional clamping methods, thus improving testing accuracy and reliability.

[0039] In an optional embodiment, the number of positioning holes 4 is at least two, and the positioning holes 4 are symmetrically arranged along the central axis of the base 3.

[0040] Specifically, there are two positioning holes 4, which are symmetrically arranged along the central axis of the base 3. The diameter of the positioning holes 4 matches the positioning holes on the oil removal valve mounting flange 6.

[0041] In an optional embodiment, a sealing assembly is also included, comprising a sealing groove and an elastic sealing ring. The sealing groove is disposed on the mating surfaces of the air inlet docking part 2 and the air outlet docking part 1 with the oil removal valve to be tested, and the elastic sealing ring is embedded in the sealing groove.

[0042] Specifically, a sealing assembly is disposed between the inlet connection portion 2 and the outlet connection portion 1 and the mating surfaces of the oil removal valve under test. The sealing assembly is used to achieve a gas path seal between the testing equipment and the oil removal valve under test, preventing gas leakage during the test. The sealing assembly includes a sealing groove and an elastic sealing ring. The sealing groove is disposed on the mating surfaces of the inlet connection portion 2 and the outlet connection portion 1 and the oil removal valve under test. The sealing groove is an annular groove, and its cross-sectional shape can be rectangular, semi-circular, or trapezoidal, etc. The elastic sealing ring is embedded in the sealing groove and can be made of rubber or an elastic material.

[0043] In an optional embodiment, the sealing assembly includes a first sealing assembly and a second sealing assembly. The first sealing assembly is disposed at one end of the housing cavity near the air outlet docking part 1, and the second sealing assembly is disposed at one end of the housing cavity near the base 3. The inner diameter of the housing cavity is clearance-fitted with the outer diameter of the oil removal valve air inlet mesh 8.

[0044] Specifically, both the first and second sealing components include a sealing groove and an elastic sealing ring. The first sealing component seals the mating surface between the air outlet joint 1 and the air outlet 5 of the oil removal valve, while the second sealing component seals the mating surface between the air inlet joint 2 and the air inlet mesh 8 of the oil removal valve. The inner cavity of the housing is cylindrical, and the inner diameter of the housing is clearance-fitted with the outer diameter of the air inlet mesh 8 of the oil removal valve. By controlling the clearance, it can be ensured that the oil removal valve under test has a guiding function when installed, while ensuring that the compression of the sealing component meets the airtightness requirements. The first and second sealing components can be replaced individually. When the elastic sealing ring in the first or second sealing component is worn or aged, the corresponding sealing groove can be disassembled for maintenance without replacing the entire sealing component.

[0045] In an optional embodiment, the elastic sealing ring is either a fluororubber O-ring or a silicone rubber O-ring.

[0046] Specifically, the material of the elastic sealing ring can be selected based on the type of test medium and the test temperature range. Fluororubber O-rings are preferred. When the test medium is compressed air and the test temperature is within the range of -20℃ to 150℃, fluororubber O-rings can be used. Fluororubber O-rings have excellent oil resistance, temperature resistance, and pressure resistance, and can stably withstand the required test pressure. Using an end-face O-ring sealing structure, a sealing groove is set at the interface between the valve inlet / outlet and the base gas path. Inserting a fluororubber O-ring ensures stable resistance to the required test pressure, effectively preventing gas leakage, ensuring a clean testing environment, and guaranteeing the accuracy of test results.

[0047] In an optional embodiment, both the air inlet connector 2 and the air outlet connector 1 are cylindrical connectors with a diameter of 10mm to 20mm and a length of 25mm to 35mm.

[0048] Specifically, the dimensions of the air intake connection portion 2 and the air outlet connection portion 1 can be adapted to the interface dimensions of the oil removal valve to be tested. In an exemplary embodiment, the diameter of the air intake connection portion 2 is 10mm to 20mm. For example, the diameter of the air intake connection portion 2 can be 10mm, 12mm, 18mm, or 20mm. For example, the length of the air intake connection portion 2 is 25mm to 35mm. For example, the length of the air intake connection portion 2 can be 25mm, 28mm, 30mm, 32mm, or 35mm. The dimensions of the air outlet connection portion 1 can be the same as or different from those of the air intake connection portion 2.

[0049] In the actual testing process, the degreasing valve to be tested is installed on the testing equipment and the power plug is connected. The following describes the operating principle of the testing equipment in this embodiment, using specific test items as examples.

[0050] See Figure 6 The degreasing valve under test includes a degreasing valve outlet 5, a degreasing valve mounting flange 6, an electrical plug 7, and a degreasing valve inlet mesh 8. The degreasing valve mounting flange 6 has two symmetrically arranged positioning holes, and the degreasing valve outlet 5 is located at the upper end of the degreasing valve. The diameter of the degreasing valve outlet 5 is 10 mm, and its depth is 5.4 mm. A one-way valve is installed inside the degreasing valve outlet 5. The degreasing valve inlet mesh 8 is a ring design. The degreasing valve inlet mesh 8 has six evenly distributed air inlets spaced 60° apart. The electrical plug 7 is located at the lower end of the degreasing valve under test.

[0051] Align the positioning hole on the mounting flange 6 of the degreasing valve with the positioning pin on the base 3, and push the degreasing valve to be tested upward so that the positioning pin is inserted into the positioning hole on the mounting flange 6 of the degreasing valve. At the same time, the air outlet 5 of the degreasing valve engages with the air outlet docking part 1, and the air inlet mesh 8 of the degreasing valve engages with the air inlet docking part 2, completing the quick clamping.

[0052] Insert the air hose of the external air source device into the quick-connect connector of the air inlet connector 2. Insert the air hose of the testing instrument into the quick-connect interface of the air outlet connector 1 to complete the air circuit connection.

[0053] Turn on the external air supply equipment and testing instruments. Perform an internal leakage test on the oil removal valve under test. During the internal leakage test, gas enters from the inlet connection 2, flows through the inside of the oil removal valve under test, and flows out from the outlet connection 1. Determine the internal leakage condition of the oil removal valve under test by detecting changes in airflow or pressure.

[0054] A pull-in voltage test is performed on the degreasing valve under test. During the pull-in voltage test, a voltage is applied to the electromagnetic coil of the degreasing valve under test through electrical plug 7. The voltage value is gradually adjusted, and the opening and closing voltages of the degreasing valve under test are measured.

[0055] Perform other functional tests on the degreasing valve under test. For example, conduct response time tests, sealing tests, or durability tests on the degreasing valve under test.

[0056] After the test is completed, disconnect the air pipes from the air inlet connector 2 and the air outlet connector 1. Pull down the oil removal valve to be tested, so that the locating pin disengages from the locating hole on the oil removal valve mounting flange 6. Remove the oil removal valve to be tested to complete the test.

[0057] The auxiliary power unit oil removal valve testing equipment provided in this application embodiment achieves rapid and precise clamping through a positioning component using a positioning pin and positioning hole combination, resulting in good clamping repeatability and high positioning accuracy. A quick-connect interface enables rapid connection of the air circuit, making operation simple and efficient. An end-face sealing component using O-rings ensures reliable sealing and effectively prevents gas leakage. Modular design facilitates maintenance and replacement of sealing components, reducing maintenance costs. Simple operation eliminates the need for tedious tasks such as wrapping Teflon tape and tightening threads, significantly reducing the workload of testing personnel and improving testing efficiency. The modular design reduces potential failure points, lowers maintenance costs, and enhances the equipment's adaptability, enabling it to meet the testing needs of different models and specifications of oil removal valves.

[0058] Those skilled in the art will understand that the steps, measures, and solutions in the various operations, methods, and processes discussed in this application can be alternated, modified, combined, or deleted. Furthermore, other steps, measures, and solutions in the various operations, methods, and processes discussed in this application can also be alternated, modified, rearranged, decomposed, combined, or deleted. Furthermore, steps, measures, and solutions in the prior art that are similar to those disclosed in this application can also be alternated, modified, rearranged, decomposed, combined, or deleted.

[0059] The above description is only a partial embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. An auxiliary power unit oil drain valve test apparatus, comprising: include: Base (3); A housing, which is disposed on the base (3), and the housing has an inner cavity; The housing is provided with an air inlet docking part (2) and an air outlet docking part (1). The air outlet docking part (1) is used to seal and connect with the air outlet (5) of the oil removal valve, and the air inlet docking part (2) is used to seal and connect with the air inlet mesh (8) of the oil removal valve.

2. An auxiliary power unit oil drain valve test apparatus as described in claim 1, wherein, The air inlet docking part (2) is located on the side of the housing, and the air outlet docking part (1) is located at the end of the housing away from the base (3).

3. An auxiliary power unit oil drain valve test apparatus as described in claim 1, wherein, Both the inlet connection part (2) and the outlet connection part (1) are provided with connecting joints at their ends for quick connection with external air source equipment.

4. An auxiliary power unit oil drain valve test apparatus as described in claim 1, wherein, The base (3) is provided with an installation edge, and the installation edge is provided with a positioning component. The positioning component includes a positioning hole (4) and a positioning pin. The positioning pin is inserted into the positioning hole (4) and is used to cooperate with the oil removal valve mounting flange (6) for positioning.

5. The auxiliary power unit oil removal valve testing device according to claim 4, characterized in that, The concentricity tolerance between the positioning hole (4) and the positioning hole on the degreasing valve mounting flange (6) is 0.05mm~0.15mm.

6. The auxiliary power unit oil removal valve testing device according to claim 4, characterized in that, The number of positioning holes (4) is at least two, and the positioning holes (4) are symmetrically arranged along the central axis of the base (3).

7. The auxiliary power unit oil removal valve testing device according to claim 1, characterized in that, It also includes a sealing assembly, which includes a sealing groove and an elastic sealing ring. The sealing groove is disposed on the mating surface of the air inlet docking part (2) and the air outlet docking part (1) with the oil removal valve, and the elastic sealing ring is embedded in the sealing groove.

8. The auxiliary power unit oil removal valve testing device according to claim 7, characterized in that, The sealing assembly includes a first sealing assembly and a second sealing assembly. The first sealing assembly is disposed at one end of the inner cavity of the housing near the air outlet docking part (1), and the second sealing assembly is disposed at one end of the inner cavity of the housing near the base (3). The inner diameter of the inner cavity of the housing is clearance-fitted with the outer diameter of the oil removal valve air inlet mesh (8).

9. The auxiliary power unit oil removal valve testing device according to claim 7, characterized in that, The elastic sealing ring is either a fluororubber O-ring or a silicone rubber O-ring.

10. The auxiliary power unit oil removal valve testing device according to claim 1, characterized in that, Both the air inlet connector (2) and the air outlet connector (1) are cylindrical connectors with a diameter of 10mm to 20mm and a length of 25mm to 35mm.

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