A pressure regulating valve for an aircraft engine bearing cavity and a test method thereof

Abstract

The present invention discloses a pressure regulating valve for an aircraft engine bearing cavity and a test method thereof. In the pressure regulating valve, a ventilation air cover is provided with a coaxially arranged pressure regulating part and a step part; the outer cylinder of the pressure regulating part is provided with an external thread, and the end surface of the step part facing the side of the pressure regulating part is provided with a plurality of vents evenly distributed along the circumferential direction, and each vent is connected with a central airway; the connection between the pressure regulating part and the step part forms a central airway with a step; the valve seat and the spring are sequentially sleeved on the pressure regulating part, and the spring seat is threadedly connected to the end of the pressure regulating part to provide compression force to the spring, so that the end surface of one side of the valve seat is pressed against the end surface of the step part provided with the vent through the compression force of the spring. The technical solution of the present invention solves the problem that the existing aircraft engine cannot work normally due to pressure loss in the bearing cavity of the engine when the flight altitude is high due to the excessively low pressure in the bearing cavity of the engine.

Description

Technical Field

[0001] The present invention relates to the field of, but is not limited to, the technical field of pressure regulation design of a lubrication system of an aero-engine, and in particular to a pressure regulating valve for a bearing cavity of an aero-engine and a testing method thereof. Background Art

[0002] For a certain type of aircraft engine, as the flight altitude increases, the external atmospheric pressure decreases with the altitude.

[0003] When the aircraft flies to high altitude (above 15 kilometers), the pressure in the engine bearing cavity will be too low, which may cause serious problems such as the bearing cavity being unable to work normally due to loss of pressure. Summary of the invention

[0004] Purpose of the present invention: An embodiment of the present invention provides a pressure regulating valve for an aircraft engine bearing cavity and a testing method thereof, so as to solve the problem that, when the existing aircraft engine is flying at a high altitude, the pressure in the engine bearing cavity is too low, resulting in the bearing cavity losing pressure and being unable to work normally.

[0005] The technical solution of the present invention: The embodiment of the present invention provides a pressure regulating valve for an aircraft engine bearing cavity, comprising: a ventilation air cover 1, a valve seat 2, a spring 3 and a spring seat 4;

[0006] The ventilation cover 1 is configured as a cylindrical structure with a central airway, including a coaxially arranged pressure regulating portion 11 and a step portion 12; the outer cylinder of the pressure regulating portion 11 is provided with an external thread, and the end surface of the step portion 12 facing the pressure regulating portion 11 is provided with a plurality of vent holes 14 evenly distributed along the circumferential direction, and each vent hole 14 is connected to the central airway 15, and the step portion 12 is provided with an annular sealing groove 12a along the circumference; wherein the connection between the pressure regulating portion 11 and the step portion 12 forms a central airway with a step;

[0007] The valve seat 2 is provided with a central through hole, and the spring seat 4 is provided with an internal threaded hole. The valve seat 2 and the spring 3 are sequentially sleeved on the pressure regulating part 11 of the ventilation cover 1, and the spring seat 4 is threadedly connected to the end of the pressure regulating part 11 to provide compression force to the spring 3, so that the compression force of the spring 3 presses one side end face of the valve seat 2 against the end face of the step part 12 provided with the vent hole 14.

[0008] Optionally, in the pressure regulating valve for the bearing chamber of an aircraft engine as described above,

[0009] The end surface of the step portion 12 of the ventilation cover 1 provided with the vent hole 14 serves as the opening end surface 1a of the pressure regulating valve;

[0010] The valve seat 2 abuts against one side end face of the opening end face (1a) as a sealing end face 2a of the pressure regulating valve, and a sealing structure of the pressure regulating valve is formed by the close contact between the sealing end face 2a and the opening end face 1a.

[0011] Optionally, in the pressure regulating valve for the bearing chamber of an aircraft engine as described above,

[0012] After the valve seat 2 is produced, a color inspection is performed on its sealing end face 2a, which requires that the sealing end face 2a has a close contact degree of not less than 90% and has no discontinuity along the periphery.

[0013] Optionally, in the pressure regulating valve for the bearing chamber of an aircraft engine as described above,

[0014] The material of the spring 3 is 50CrVA. It is required that when the spring 3 is compressed from the free height to the preset height, the output elastic force is the preset pressure. It is also required that after the spring 3 is compressed 10 times, the allowable residual variable of the spring 3 is not greater than the preset variable value.

[0015] Optionally, in the pressure regulating valve for the bearing chamber of an aircraft engine as described above,

[0016] The internal thread hole of the spring seat 4 matches the external thread of the pressure regulating part 11 in the ventilation cover 1, and the hardness value HBS of the spring seat is between 311 and 388.

[0017] Optionally, in the pressure regulating valve for the bearing chamber of an aircraft engine as described above,

[0018] The pressure regulating valve is used to adjust the compression force applied by the phase spring 3 by adjusting the threaded position of the spring seat 4, thereby adjusting the pressure of the spring 3 acting on the valve seat 2.

[0019] Optionally, in the pressure regulating valve for the bearing chamber of an aircraft engine as described above,

[0020] The ventilation cover 1 also includes: a mounting seat 13 arranged at the outer end of the step portion 12, the mounting seat 13 includes a plurality of bosses distributed circumferentially along the step portion 12, each boss is provided with a mounting hole for fixing the pressure regulating valve on the pressure testing equipment through the mounting seat 13.

[0021] The embodiment of the present invention further provides a method for testing a pressure regulating valve, which is used to test the pressure regulating valve for the bearing cavity of an aircraft engine as described in any one of the above items. The testing method includes:

[0022] Step 1, fixing the pressure regulating valve to the pressure testing equipment, including: placing the pointer of the dial gauge 7 against the valve seat 2, plugging the plug 8 at the step of the central airway of the ventilation cover 1, and pressing the outer end of the step 12 in the ventilation cover 1 through a sealing plate, forming a sealed cavity A in the pressure regulating valve, and connecting the air pipeline 5 of the pressure testing equipment to the sealed cavity A through a pipeline switch 51, and a pressure gauge 6 is provided on the air pipeline 5;

[0023] Step 2, introducing compressed air into the sealing chamber A of the pressure regulating valve through the pressure testing equipment, and making the pressure indicated by the pressure gauge 6 remain at the preset opening pressure, that is, the equivalent pressure of the preset height;

[0024] Step 3, compress the spring 3 by adjusting the thread position of the spring seat 4, and observe the changes of the pointer of the micrometer 7. When the pointer of the micrometer 7 moves, the thread position of the spring seat 4 is the thread position corresponding to the preset opening pressure.

[0025] Beneficial effects of the invention: The embodiment of the invention provides a pressure regulating valve for an aircraft engine bearing cavity and a test method thereof. The pressure regulating valve is formed by assembling an air cover 1, a valve seat 2, a spring 3 and a spring seat 4. The pressure regulating valve adjusts the compression force applied by the phase spring 3 by adjusting the thread position of the spring seat 4, thereby adjusting the pressure of the spring 3 on the valve seat 2. Due to the pressure regulating valve provided by the embodiment of the invention, the pressure of the spring 3 on the valve seat 2 is adjustable, that is, the opening pressure of the pressure regulating valve is adjustable. In this way, for air pressures at different altitudes, different opening air pressures can be obtained by adjusting the thread position of the spring seat 4 based on the size of the ambient air pressure, thereby making the pressure regulating valve suitable for working in a variety of air pressure environments. Using the pressure regulating valve provided by the embodiment of the invention, in view of the flight requirement of a flight altitude of 15 kilometers, during the test process, by moving the thread position of the spring seat 4, the opening pressure of the pressure regulating valve can be quickly adjusted to 12KPa-14KPa, thereby ensuring that the engine bearing cavity lubricating oil pump works normally under the condition of a flight altitude of 15 kilometers. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0027] Figure 1 A schematic structural diagram of a pressure regulating valve for an aircraft engine bearing cavity provided by an embodiment of the present invention;

[0028] Figure 2 for Figure 1A schematic diagram of the structure of a ventilating air cover in a pressure regulating valve for a bearing cavity of an aircraft engine provided by the illustrated embodiment;

[0029] Figure 3 for Figure 2 A top view of a vent cover provided by the illustrated embodiment;

[0030] Figure 4 for Figure 1 A schematic structural diagram of a valve seat in a pressure regulating valve for a bearing chamber of an aircraft engine provided by the illustrated embodiment;

[0031] Figure 5 for Figure 1 A schematic diagram of the structure of a spring in a pressure regulating valve for a bearing chamber of an aircraft engine provided by the illustrated embodiment;

[0032] Figure 6 for Figure 1 A schematic diagram of the structure of a spring seat in a pressure regulating valve for a bearing cavity of an aircraft engine provided by the illustrated embodiment;

[0033] Figure 7 For Figure 1 The illustrated embodiment provides a schematic diagram of the principle of testing a pressure regulating valve for a bearing cavity of an aircraft engine. Description of the drawings:

[0035] 1: Ventilation cover;

[0036] 11: pressure regulating part;

[0037] 12: Step part;

[0038] 12a: annular sealing groove;

[0039] 13: Mounting seat

[0040] 14: vent hole;

[0041] 1a: Open end face;

[0042] 2: Valve seat;

[0043] 2a: Sealing end face;

[0044] 3: Spring;

[0045] 4: Spring seat;

[0046] A: Sealed cavity;

[0047] 5: Air pipeline;

[0048] 51: Pipeline switch;

[0049] 6: Pressure gauge;

[0050] 7: Micrometer;

[0051] 8: Plug. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solution and advantages of the present invention more clear, the embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other arbitrarily without conflict.

[0053] As described in the above background technology, in the case of existing aircraft engines flying at high altitudes, the pressure in the engine bearing cavity is too low, resulting in the bearing cavity losing pressure and being unable to work normally.

[0054] When flying at high altitude (above 15 kilometers), in order to prevent the pressure of the aircraft engine bearing cavity from being too low, causing the bearing cavity to lose pressure and fail to work, the embodiment of the present invention provides a pressure regulating valve for the aircraft engine bearing cavity. The function of the pressure regulating valve provided by the embodiment of the present invention is: when the aircraft engine is flying at an altitude of more than 15 kilometers, the pressure of the engine bearing cavity can be maintained at a constant pressure (12KPa~14KPa), thereby ensuring the normal operation of the engine bearing cavity lubricating oil pump.

[0055] The present invention provides the following specific embodiments which can be combined with each other. The same or similar concepts or processes may not be described in detail in some embodiments.

[0056] Figure 1 A schematic diagram of a pressure regulating valve for an aircraft engine bearing cavity provided in an embodiment of the present invention. The pressure regulating valve for an aircraft engine bearing cavity provided in an embodiment of the present invention may include four components: a ventilating air cover 1, a valve seat 2, a spring 3 and a spring seat 4.

[0057] Figure 2 for Figure 1 The illustrated embodiment provides a schematic structural diagram of a ventilating cover in a pressure regulating valve for an aircraft engine bearing cavity. Figure 3 for Figure 2 A top view of a vent cover is provided in the illustrated embodiment. Figures 1 to 3 The pressure regulating valve shown in the figure has a ventilation air cover 1 configured as a cylindrical structure with a central airway, including a coaxially arranged pressure regulating portion 11 and a step portion 12; the outer cylinder of the pressure regulating portion 11 is provided with an external thread, and the end surface of the step portion 12 facing the pressure regulating portion 11 is provided with a plurality of vent holes 14 evenly distributed along the circumferential direction, and each vent hole 14 is connected to the central airway, and the step portion 12 is provided with an annular sealing groove 12a along the circumference; wherein, the connection between the pressure regulating portion 11 and the step portion 12 forms a central airway with a step.

[0058] Figure 4 for Figure 1 The illustrated embodiment provides a schematic structural diagram of a valve seat in a pressure regulating valve for an aircraft engine bearing cavity. Figure 5 for Figure 1 The illustrated embodiment provides a schematic structural diagram of a spring in a pressure regulating valve for an aircraft engine bearing cavity. Figure 6 for Figure 1 The illustrated embodiment provides a schematic structural diagram of a spring seat in a pressure regulating valve for an aircraft engine bearing cavity.

[0059] Reference Figure 1 , Figures 4 to 6 As shown, in the embodiment of the present invention, the valve seat 2 is provided with a central through hole, and the spring seat 4 is provided with an internal threaded hole; wherein the valve seat 2 and the spring 3 are sequentially sleeved on the pressure regulating part 11 of the ventilation cover 1, and the spring seat 4 is threadedly connected to the end of the pressure regulating part 11, and is used to provide compression force to the spring 3, so that the compression force of the spring 3 presses one side end face of the valve seat 2 against the end face of the step part 12 provided with the vent hole 14.

[0060] like Figure 1 The ventilation cover 1, valve seat 2, spring 3 and spring seat 4 are combined into a mounting structure of a pressure regulating valve. The end face of the step portion 12 of the ventilation cover 1 provided with a vent hole 14 serves as the opening end face of the pressure regulating valve.

[0061] Correspondingly, the valve seat 2 abuts against one side end face of the opening end face 1a as a sealing end face 2a of the pressure regulating valve, and the sealing structure of the pressure regulating valve is formed by the close contact between the sealing end face 2a and the opening end face 1a.

[0062] In one implementation of an embodiment of the present invention, the sealing end face 2a of the valve seat 2 has technical index requirements. After the valve seat 2 is produced, it is required to perform a coloring inspection on the sealing end face 2a. The inspection requires that the tightness of the sealing end face 2a is not less than 90% and there is no discontinuity along the periphery.

[0063] In one implementation of the embodiment of the present invention, the material of the spring 3 can be 50CrVA, and it is required that when the spring 3 is compressed from the free height to the preset height, the output elastic force is a preset pressure, and it is required that after the spring 3 is compressed 10 times, the allowable residual variable of the spring 3 is not greater than the preset variable value.

[0064] In a specific embodiment of the present invention, the internal thread hole of the spring seat 4 matches the external thread of the pressure regulating part 11 in the ventilating air cover 1. For example, the external thread of the pressure regulating part 11 is set as an M18 external thread, and the internal thread hole of the spring seat 4 is also an M18 internal thread hole. Optionally, the hardness value (HBS) of the spring seat 4 is between 311 and 388.

[0065] In an implementation of the embodiment of the present invention, the structure of the ventilation cover 1 may further include:

[0066] A mounting seat 13 is disposed at the outer end of the step portion 12 , and the mounting seat 13 includes a plurality of bosses distributed circumferentially along the step portion 12 , each boss is provided with a mounting hole for fixing the pressure regulating valve on the pressure testing equipment through the mounting seat 13 .

[0067] In practical applications, the centers of all the mounting holes on the boss are located at the same circumference, and the ventilation air cover 1 of the pressure regulating valve is firmly fixed through three mounting points.

[0068] The method of using the pressure regulating valve for the bearing cavity of an aircraft engine provided by the above embodiment of the present invention is: by adjusting the threaded position of the spring seat 4 to adjust the compression force applied by the phase spring 3, thereby adjusting the pressure of the spring 3 acting on the valve seat 2.

[0069] Based on the pressure regulating valve for the bearing cavity of an aircraft engine provided by the above embodiments of the present invention, the embodiment of the present invention further provides a method for testing the pressure regulating valve. The testing method provided by the embodiment of the present invention is used to test the pressure regulating valve for the bearing cavity of an aircraft engine provided by any of the above embodiments to test whether the thread position of the spring seat of the pressure regulating valve is in a position that meets the opening pressure. Figure 7 As shown, for Figure 1 The embodiment shown is a schematic diagram of the principle of testing the pressure regulating valve of the bearing cavity of an aircraft engine. The implementation principle of the test method is:

[0070] Fix the pressure regulating valve on the pressure test equipment, such as Figure 7 As shown, place the pointer of the micrometer 7 against the valve seat 2, and introduce compressed air into the sealing chamber A of the pressure regulating valve. When the pointer of the micrometer 7 moves, the opening pressure of the valve seat 2 can be read through the pressure gauge 6.

[0071] Based on the above test principle, it can be known that the equivalent pressure at a flight altitude of 15 kilometers is 12KPa~14KPa; therefore, in a specific embodiment, by adjusting the thread position of the spring seat 4, the opening pressure of the valve seat 2 can be adjusted to 12KPa~14KPa.

[0072] The implementation process of the test method provided in the embodiment of the present invention specifically includes the following steps:

[0073] Step 1, fixing the pressure regulating valve to the pressure testing equipment, including: placing the pointer of the dial gauge 7 against the valve seat 2, plugging the plug 8 at the step of the central airway of the ventilation cover 1, and pressing the outer end of the step 12 in the ventilation cover 1 through a sealing plate, forming a sealed cavity A in the pressure regulating valve, and connecting the air pipeline 5 of the pressure testing equipment to the sealed cavity A through a pipeline switch 51, and a pressure gauge 6 is provided on the air pipeline 5;

[0074] Step 2, introducing compressed air into the sealing chamber A of the pressure regulating valve through the pressure testing equipment, and making the pressure indicated by the pressure gauge 6 remain at the preset opening pressure, that is, the equivalent pressure of the preset height;

[0075] Step 3, compress the spring 3 by adjusting the thread position of the spring seat 4, and observe the changes of the pointer of the micrometer 7. When the pointer of the micrometer 7 moves, the thread position of the spring seat 4 is the thread position corresponding to the preset opening pressure.

[0076] The pressure regulating valve and test method thereof for the bearing cavity of an aircraft engine provided in an embodiment of the present invention are assembled by an air cover 1, a valve seat 2, a spring 3 and a spring seat 4 to form a pressure regulating valve. The pressure regulating valve adjusts the compression force applied by the phase spring 3 by adjusting the thread position of the spring seat 4, thereby adjusting the pressure of the spring 3 acting on the valve seat 2. Due to the pressure regulating valve provided in the embodiment of the present invention, the pressure of the spring 3 acting on the valve seat 2 is adjustable, that is, the opening pressure of the pressure regulating valve is adjustable, so that for air pressures at different altitudes, different opening air pressures can be obtained by adjusting the thread position of the spring seat 4 based on the size of the ambient air pressure, so that the pressure regulating valve is suitable for working in a variety of air pressure environments. Using the pressure regulating valve provided in the embodiment of the present invention, in view of the flight requirement of a flight altitude of 15 kilometers, during the test process, by moving the thread position of the spring seat 4, the opening pressure of the pressure regulating valve can be quickly adjusted to 12KPa~14KPa, thereby ensuring that the engine bearing cavity lubricating oil pump works normally under the condition of a flight altitude of 15 kilometers.

[0077] The specific implementation of the pressure regulating valve for an aircraft engine bearing cavity and the testing method thereof provided in an embodiment of the present invention is described below through a specific implementation example.

[0078] Reference Figures 1 to 7 As shown, the pressure regulating valve for the bearing chamber of an aircraft engine provided by this embodiment is formed by assembling four parts: a ventilation cover 1 , a valve seat 2 , a spring 3 and a spring seat 4 .

[0079] Reference Figures 1 to 3The pressure regulating valve shown in the figure has a ventilation cover 1 which is configured as a cylindrical structure with a central airway, including a coaxially arranged pressure regulating portion 11 and a step portion 12; the outer cylinder of the pressure regulating portion 11 is provided with an M18 external thread for threaded connection with the spring seat 4; on the end surface of the step portion 12 facing the pressure regulating portion 11, a plurality of vents 14 are evenly distributed along the circumference, for example, 12 vents 14 with a diameter of 10 mm are evenly distributed for exhausting gas; the step portion 12 is provided with an annular sealing groove 12a along the circumference, and the annular sealing groove 12a can be set as a sealing groove with a width of 3 mm and a depth of 1.5 mm, which is used to place a rubber ring to ensure air tightness; a mounting seat 13 is provided at the outer bottom of the step portion 12, and the mounting seat 13 includes 3 bosses distributed along the circumference of the step portion 12, and each boss is provided with a 12 mm mounting hole for fixing the pressure regulating valve on the pressure testing equipment.

[0080] Reference Figures 1 to 6 The pressure regulating valve shown in the embodiment has a sealing end face 2a of the valve seat 2 that meets the roughness requirements and is required to be subjected to a coloring inspection before leaving the factory. The tightness is not less than 90% and there is no interruption along the periphery. The middle part of the valve seat 2 is a hole with a diameter of 18, which is used to be mounted on the M18 external thread of the ventilation cover 1 and is in close contact with the end face where the vent hole 14 is provided.

[0081] In this implementation example, the material of the spring 3 can be 50CrVA. When the spring 3 is compressed from a free height of 53.9 mm to 34 mm, the output elastic force is 7 N. After the spring 3 is compressed 10 times, the allowable residual variable of the spring 3 is no more than 0.15 mm.

[0082] In this implementation example, the spring seat 4 has an M18 internal thread, and the hardness value (HBS) of the spring seat should be between 311 and 388.

[0083] In this implementation example, the pressure regulating valve is composed of four parts: the ventilation air cover 1, the valve seat 2, the spring 3 and the spring seat 4. By adjusting the threaded position of the spring seat 4, the elastic force of the spring 3 on the valve seat 2 can be adjusted. The elastic force is opposite to the air pressure acting in the pressure regulating valve. The valve seat 2 is pushed open by the air pressure, and the entire valve is opened.

[0084] In this implementation example, the pressure regulating valve is fixed on the pressure testing device, such as Figure 7 As shown, place the pointer of the micrometer 7 against the valve seat 2, and introduce compressed air into the sealing chamber A of the pressure regulating valve. When the pointer of the micrometer 7 moves, the opening pressure of the valve seat 2 can be read through the pressure gauge 6.

[0085] Through conversion, it can be known that the atmospheric pressure corresponding to an altitude of 15 kilometers is 12KPa~14KPa. When the pressure regulating valve is applied to the scenario of flying at an altitude of 15 kilometers, it is measured by the pressure testing equipment that the opening pressure of the valve seat 2 can be adjusted to the spring seat 4 position corresponding to 12KPa~14KPa, that is, the spring seat 4 position for the normal operation of the engine bearing cavity lubricating oil pump when flying at an altitude of 15 kilometers.

[0086] Although the embodiments disclosed in the present invention are as above, the contents described are only embodiments adopted to facilitate understanding of the present invention and are not intended to limit the present invention. Any technician in the field to which the present invention belongs can make any modifications and changes in the form and details of implementation without departing from the spirit and scope disclosed in the present invention, but the patent protection scope of the present invention shall still be subject to the scope defined in the attached claims.

Claims

1. A pressure regulating valve for an aircraft engine bearing cavity, characterized in that: include: A ventilation cover (1), a valve seat (2), a spring (3) and a spring seat (4); the material of the spring (3) is 50CrVA; The ventilation cover (1) is configured as a cylindrical structure with a central airway, comprising a coaxially arranged pressure regulating portion (11) and a step portion (12); the outer cylinder of the pressure regulating portion (11) is provided with an external thread, and the end surface of the step portion (12) facing the pressure regulating portion (11) is provided with a plurality of vent holes (14) evenly distributed along the circumferential direction, and each vent hole (14) is connected to the central airway, and the step portion (12) is provided with an annular sealing groove (12a) along the circumference; wherein the connection between the pressure regulating portion (11) and the step portion (12) forms a central airway with a step; The valve seat (2) is provided with a central through hole, and the spring seat (4) is provided with an internal threaded hole. The valve seat (2) and the spring (3) are sequentially sleeved on the pressure regulating portion (11) of the ventilation cover (1). The spring seat (4) is threadedly connected to a preset position of the external thread of the pressure regulating portion (11) to provide a compressive force to the spring (3), so that the end surface of one side of the valve seat (2) is pressed against the end surface of the step portion (12) provided with the vent hole (14) by the compressive force of the spring (3); The pressure regulating valve is used to adjust the compression force applied to the spring (3) by adjusting the threaded position of the spring seat (4), thereby adjusting the pressure of the spring (3) acting on the valve seat (2), so that the opening pressure of the pressure regulating valve is adjustable; The pressure regulating valve is also used for obtaining different opening air pressures by adjusting the thread position of the spring seat (4) according to the air pressure at different altitudes based on the size of the ambient air pressure, thereby making the pressure regulating valve suitable for working in a variety of air pressure environments.

2. The pressure regulating valve for the bearing chamber of an aircraft engine according to claim 1, characterized in that: The end surface of the step portion (12) of the ventilation cover (1) provided with a vent hole (14) serves as an opening end surface (1a) of the pressure regulating valve; The valve seat (2) abuts against one side end face of the open end face (1a) as a sealing end face (2a) of the pressure regulating valve, and a sealing structure of the pressure regulating valve is formed by the close contact between the sealing end face (2a) and the open end face (1a).

3. The pressure regulating valve for the bearing chamber of an aircraft engine according to claim 2, characterized in that: After the valve seat (2) is produced, its sealing end surface (2a) is subjected to a coloring inspection, and it is required that the sealing end surface (2a) has a close contact degree of not less than 90% and has no discontinuity along the periphery.

4. The pressure regulating valve for an aircraft engine bearing chamber according to claim 1, characterized in that: It is required that when the spring (3) is compressed from a free height to a preset height, the output elastic force is a preset pressure, and it is required that after the spring (3) is compressed 10 times, the allowable residual variable of the spring (3) is not greater than the preset variable value.

5. The pressure regulating valve for the bearing chamber of an aircraft engine according to claim 1, characterized in that: The internal thread hole of the spring seat (4) matches the external thread of the pressure regulating part (11) in the ventilation cover (1), and the hardness value (HBS) of the spring seat is between 311 and 388.

6. The pressure regulating valve for an aircraft engine bearing chamber according to any one of claims 1 to 5, characterized in that: The ventilation cover (1) further comprises: a mounting seat (13) arranged at the outer end of the step portion (12), the mounting seat (13) comprising a plurality of bosses distributed circumferentially along the step portion (12), each boss being provided with a mounting hole for fixing the pressure regulating valve on the pressure testing device via the mounting seat (13).

7. A method for testing a pressure regulating valve, characterized in that: Used to test the pressure regulating valve for the bearing cavity of an aircraft engine according to any one of claims 1 to 6, the testing method comprising: Step 1, fixing the pressure regulating valve to the pressure testing equipment, including: placing the pointer of the dial gauge (7) against the valve seat (2), plugging the plug (8) at the step of the central air passage of the ventilation air cover (1), and pressing the plug on the outer end of the step portion (12) of the ventilation air cover (1) through a sealing plate, forming a sealed cavity (A) in the pressure regulating valve, and connecting the air pipeline (5) of the pressure testing equipment to the sealed cavity (A) through a pipeline switch (51), and providing a pressure gauge (6) on the air pipeline (5); Step 2, introducing compressed air into the sealing chamber (A) of the pressure regulating valve through the pressure testing equipment, and making the pressure indicated by the pressure gauge (6) remain at the preset opening pressure, that is, the equivalent pressure of the preset height; Step 3, compress the spring (3) by adjusting the thread position of the spring seat (4), and observe the change of the pointer of the micrometer (7). When the pointer of the micrometer (7) moves, the thread position of the spring seat (4) is the thread position corresponding to the preset opening pressure.

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