A pressure-limiting protection type integrated aviation plunger pump oil distribution cover assembly

Abstract

The application discloses a pressure-limiting protection type integrated aviation plunger pump oil distribution cover assembly, wherein a plug, a filter element, a filter seat, a pressure valve part and a control valve part are coaxially arranged in the oil distribution cover in sequence; the one-way valve part is connected with a pump shell and an oil inlet when overpressure; an annular groove is formed in the outer periphery of the filter element and is connected with a pump outlet, a filtering hole is radially formed to connect the annular groove and an internal oil filtering cavity; a boss is arranged at the front end of the valve sleeve of the pressure valve part and is tightly attached to the filter seat, a flow guide groove is formed in the outer periphery of the boss, and one of the flow guide grooves is connected with a control piston of the pump; the frontmost end flow guide groove is connected with the oil filtering cavity through a flow channel in the boss and the filter seat; a through hole is radially formed in the valve sleeve to connect the flow guide groove and an internal cavity; a valve core is arranged in the cavity, two annular grooves are formed in the outer periphery of the valve core, a blind hole is formed in the front end surface of the valve core and is connected with the front end annular groove through a flattened portion on the valve core, and a limiting shoulder is arranged at the rear end of the valve core; the control valve part can exert an adjustable axial forward force on the valve core. The application can realize pressure-limiting protection, automatic oil supplement and oil pressure adjustment.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of hydraulic transmission, in particular to a pressure limiting protection type integrated aviation plunger pump oil distribution cover assembly. BACKGROUND

[0002] The aviation plunger pump, as the power element of the aircraft hydraulic system, plays a crucial role in the maneuverability and safety of the aircraft. In order to improve the flight efficiency of the aircraft, high speed, light weight and high pressure are the development trends of the aviation plunger pump.

[0003] At high rotation speed, the pump inlet cavitation will cause problems such as large system noise, oil heating and flow distribution disc cavitation. In order to solve the problem of cavitation caused by insufficient inlet pressure of the pump at high rotation speed, a booster impeller is often installed at the pump inlet, or the oil tank is pressurized, but this will increase the weight of the system. On the other hand, increasing the working pressure of the system will often increase the oil leakage pressure inside the pump, which will bring great challenges to the performance of the mechanical seal. Therefore, reducing the weight of the pump, improving the self-priming property of the pump at high rotation speed and reducing the oil leakage pressure of the pump are of great significance to improve the reliability of the aircraft hydraulic system. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a pressure limiting protection type integrated aviation plunger pump oil distribution cover assembly.

[0005] The specific technical solutions are as follows:

[0006] A pressure limiting protection type integrated aviation plunger pump oil distribution cover assembly, comprising: an oil distribution cover, a plug, an oil filter component, a pressure valve component, a control valve component arranged in the oil distribution cover in sequence and coaxially in a stepped through hole in the oil distribution cover, and a check valve component, an inlet pipe joint and an outlet pipe joint installed on the oil distribution cover; the stepped through hole comprises a first cylindrical hole, a second cylindrical hole and a third cylindrical hole with diameters decreasing in sequence; the outlet pipe joint is in communication with an oil outlet of the plunger pump, and the inlet pipe joint is in communication with an oil inlet of the plunger pump; an oil inlet port of the check valve component is in communication with a pump shell through a channel formed in the oil distribution cover, and an oil outlet port is in communication with the oil inlet of the plunger pump through a flow channel in the oil distribution cover.

[0007] The plug is arranged in the first cylindrical hole and sealed therewith; the oil filter component comprises a filter element and a filter seat, and is arranged in the second cylindrical hole with the same diameter, the front end of the filter element abutting against the plug, and the rear end being coaxially installed on the filter seat; an annular groove is formed in the outer periphery of the middle section of the filter element, and a flow channel is formed in the oil distribution cover to connect the oil outlet of the plunger pump with the annular groove; a blind hole is formed in the center of the rear end surface of the filter element to form an oil filter cavity, and a plurality of filter holes are radially formed to connect the annular groove with the oil filter cavity.

[0008] The pressure valve component comprises a valve core and a valve sleeve, the valve sleeve is arranged in the third cylindrical hole in equal diameter, a boss is arranged at the front end of the valve sleeve, which is closely attached to the rear end of the filter seat and cooperates with the step between the second cylindrical hole and the third cylindrical hole to realize axial limiting; a plurality of annular flow guide grooves are arranged on the outer periphery of the valve sleeve, and the adjacent flow guide grooves are sealed; one of the flow guide grooves is selected according to the pressure limiting requirement, a channel is arranged in the oil distribution cover to communicate the flow guide groove with the variable piston of the plunger pump, and the connecting port is the outlet of the pressure valve component; an oil passage one is arranged between the boss and the frontmost flow guide groove to realize communication, a flow channel is arranged in the filter seat to communicate the oil filter cavity with the oil passage one; a through hole is axially arranged in the valve sleeve, and an oil passage two is radially arranged to communicate the flow guide groove with the through hole, and the valve core is coaxially installed in the through hole; two annular grooves are arranged on the outer periphery of the middle section of the valve core; a blind hole is coaxially arranged at the front end surface of the valve core, and the front section is axially flattened to communicate the blind hole with the front end annular groove; a limiting shoulder is arranged at the rear end of the valve core to realize axial one-way limiting in cooperation with the valve sleeve.

[0009] The control valve component abuts against the valve core, is used for applying an axial forward force to the valve core, and the size of the force can be adjusted within a certain range.

[0010] Further, the one-way valve component comprises a ball valve, a ball valve spring and a spring seat arranged in sequence and coaxially; the spring seat is installed on the oil distribution cover, one end of the ball valve spring abuts against the spring seat, and the other end abuts against the ball valve, and in the initial state, the ball valve abuts against the oil inlet port of the one-way valve component.

[0011] Further, the control valve component comprises a spring, a mounting seat and a locking nut; the mounting seat is installed on the oil distribution cover through threads; the locking nut is sleeved on the outer periphery of the mounting seat and is used for axially and radially limiting the mounting seat; the spring is coaxially installed in the mounting seat, one end of the spring abuts against the valve core, and the other end abuts against the mounting seat.

[0012] Further, the oil distribution cover comprises an oil distribution cover mounting seat, an outlet pipe mounting port, an inlet pipe mounting port and a cylindrical barrel; the mounting hole is arranged on the outer periphery of the oil distribution cover mounting seat and is used for mounting the oil distribution cover on the plunger pump; the cylindrical barrel is fixedly connected to the surface of the oil distribution cover mounting seat, and a stepped through hole is axially arranged in the cylindrical barrel; the outlet pipe mounting port and the inlet pipe mounting port are arranged on the surface of the oil distribution cover mounting seat and are respectively arranged on the radial two sides of the cylindrical barrel; the outlet pipe mounting port is used for mounting the outlet pipe joint, and the inlet pipe mounting port is used for mounting the inlet pipe joint.

[0013] Further, the outlet pipe joint is installed in the outlet pipe mounting port through threads, and the inlet pipe joint is installed in the inlet pipe mounting port through threads.

[0014] Further, a sealing groove is formed on the outer periphery of the front end of the filter element, and a sealing ring is arranged in the sealing groove to realize sealing between the filter element and the oil distribution cover.

[0015] Further, among the flow guide grooves formed on the valve sleeve, the flow guide groove at the last end communicates with the housing cavity of the pump through an oil discharge flow channel formed in the oil distribution cover.

[0016] The beneficial effects of the present application are:

[0017] (1) The present application can realize pressure limiting protection, automatic oil supplement and pressure adjustment. By skillfully arranging the one-way valve assembly on the oil distribution cover, the oil in the pump housing can be automatically unloaded, and the oil in the pump housing is discharged to the oil inlet of the piston pump. On the one hand, the problem of insufficient oil supplement at the oil inlet of the piston pump under high-speed working conditions is solved. On the other hand, the oil in the pump housing is unloaded, the pressure in the pump housing is reduced, and the mechanical seal is protected from damage. At the same time, the opening pressure of the one-way valve assembly can be adjusted according to the working conditions of the piston pump, so as to realize the function of adjustable pressure in the pump housing.

[0018] (2) The present application can adjust and control the size of the force exerted by the control valve assembly on the valve core in the axial direction, and control the oil pressure of the oil flowing into the variable piston of the piston pump through the oil filter assembly and the pressure valve assembly.

[0019] (3) The present application adopts integrated design, integrates the pressure valve assembly and the one-way valve assembly on the oil distribution cover, realizes function integration, and reduces the overall weight of the piston pump during assembly and use. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a sectional view of the pressure limiting protection type integrated aviation piston pump oil distribution cover assembly in the embodiment of the present application.

[0021] Figure 2 is a three-dimensional structure diagram of the oil distribution cover in the embodiment of the present application.

[0022] Figure 3 is a three-dimensional partial sectional view of the pressure limiting protection type integrated aviation piston pump oil distribution cover assembly in the embodiment of the present application.

[0023] Figure 4 is a half-sectional view of the oil filter assembly in the embodiment of the present application.

[0024] Figure 5 is a half-sectional view of the pressure valve assembly in the embodiment of the present application.

[0025] Figure 6 is a schematic diagram of the oil flow in the oil filter assembly and the pressure valve assembly in the embodiment of the present application.

[0026] In the diagram, 1 is the oil distributor cap and 2 is the plug; 3 is the oil filter assembly, 3-1 is the filter element and 3-2 is the filter base; 4 is the pressure valve assembly, 4-1 is the valve core, 4-1-1 is the worktable shoulder, 4-1-2 is the guide shoulder and 4-1-3 is the limit shoulder, 4-2 is the valve sleeve, 4-2-1 is the boss, 4-2-2 is the first guide groove, 4-2-3 is the second guide groove and 4-2-4 is the third guide groove; 5 is the control valve assembly, 5-1 is the spring, 5-2 is the mounting base and 5-3 is the locking nut; 6 is the check valve assembly, 6-1 is the ball valve, 6-2 is the ball valve spring and 6-3 is the spring seat; 7 is the inlet pipe connector and 8 is the outlet pipe connector. Detailed Implementation

[0027] The present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments. The objectives and effects of the present invention will become clearer as a result. The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0028] like Figure 1 As shown, a pressure-limiting and protective integrated aviation plunger pump oil distributor cap assembly includes: an oil distributor cap 1, a plug 2, an oil filter component 3, a pressure valve component 4, a control valve component 5, a check valve component 6, an inlet pipe connector 7, and an outlet pipe connector 8. The plug 2, oil filter component 3, pressure valve component 4, and control valve component 5 are sequentially and coaxially installed in the cavity inside the oil distributor cap 1. The inlet pipe connector 8 and the outlet pipe connector 7 are threaded onto the oil distributor cap 1. The outlet pipe connector 7 communicates with the oil filter component 3, and the inlet pipe connector 8 communicates with the outlet of the check valve component 4.

[0029] Among them, the structure of oil separator cap 1 is as follows Figure 2 As shown, the oil distributor cap 1 is integrally molded and structurally comprises: an oil distributor cap mounting base, an outlet pipe mounting port, an inlet pipe mounting port, and a cylindrical cylinder. The oil distributor cap mounting base has mounting holes on its outer periphery for fixing the oil distributor cap assembly to the plunger pump. The cylindrical cylinder is fixed to the surface of the oil distributor cap mounting base (referred to as the upper surface). A stepped through-hole is formed axially inside the cylindrical cylinder, consisting of a first cylindrical hole, a second cylindrical hole, and a third cylindrical hole, with decreasing diameters from front to back. The outlet pipe mounting port and the inlet pipe mounting port are also located on the upper surface of the oil distributor cap mounting base and are respectively arranged on the radial sides of the cylindrical cylinder. The outlet pipe mounting port is used to install the outlet pipe connector 8 and connect it to the pump outlet, while the inlet pipe mounting port is used to install the inlet pipe connector 7 and connect it to the pump inlet. The installation method can be threaded.

[0030] The plug 2 is interference-fitted into the first cylindrical hole to achieve a seal inside the oil separator cover 1.

[0031] Oil filter component 3 is installed in the second cylindrical hole, such as Figure 3As shown, the oil filter component 3 comprises a filter core 3-1 and a filter seat 3-2 arranged coaxially. The filter core 3-1 is a cylindrical member with the same outer diameter as the second cylindrical hole, the front end of which is tightly attached to the plug 2, and the rear end of which is coaxially installed on the filter seat 3-2 to form a complete filtering unit. The front end of the filter core 3-1 is provided with a sealing groove for installing a sealing ring, and the outer periphery of the middle part is provided with a circumferential annular groove, and the inner part of the oil distribution cover 1 is provided with a flow channel to communicate the oil outlet of the plunger pump with the annular groove; the rear end surface of the filter core 3-1 is provided with a counterbore in the center axis to form an oil filtering cavity, and a plurality of filtering holes are radially arranged on the filter core 3-1 to communicate the annular groove with the oil filtering cavity, and the dense filtering holes play a role in filtering impurities in the oil. The filter seat 3-2 is provided with a sealing groove at the contact with the oil distribution cover 1 for installing a sealing ring, and the sealing grooves provided on the filter core 3-1 and the filter seat 3-2 are matched with the sealing rings respectively to realize the sealing between the oil filter component 3 and the inner wall of the oil distribution cover 1. The front end of the filter seat 3-2 is coaxially provided with a blind hole and is communicated with the oil filtering cavity, and the rear end is provided with a plurality of inclined holes for communicating with the pressure valve component 4, and the filtered oil can enter the pressure valve component 4 through the inclined holes.

[0032] The pressure valve component 4 is installed in the third cylindrical hole, as shown in Figure 4As shown, the pressure valve component 4 comprises a spool 4-1 and a valve sleeve 4-2 arranged coaxially. The valve sleeve 4-2 is a cylindrical hollow structure with a cylindrical through hole coaxially opened in the inside, and a boss 4-2-1 is arranged at the front end of the valve sleeve 4-2. The diameter of the boss 4-2-1 is greater than that of the third cylindrical hole and not greater than that of the second cylindrical hole, so as to limit the axial backward movement of the valve sleeve 4-2. The rear end surface of the filter seat 3-2 is closely attached to the front end surface of the valve sleeve 4-2 (i.e. the front end surface of the boss 4-2-1). Since the axial forward movement of the filter seat 3-2 is limited by the plug 2, the axial forward movement of the valve sleeve 4-2 can be limited. In summary, the above structure design realizes the axial limitation of the valve sleeve 4-2. A plurality of annular flow guide grooves are arranged on the outer periphery of the valve sleeve 4-2 for oil flow. A sealing groove for mounting a sealing ring is arranged between adjacent flow guide grooves, so as to realize the sealing between adjacent flow guide grooves. In this embodiment, three flow guide grooves are arranged, which are sequentially a first flow guide groove 4-2-2, a second flow guide groove 4-2-3 and a third flow guide groove 4-2-4 from front to back. According to the pressure limiting requirement, one of the flow guide grooves is selected, a channel is arranged in the oil distribution cover 1 to communicate the flow guide groove with the variable piston of the plunger pump, and the connecting port is the outlet of the pressure valve component 4. In this embodiment, the second flow guide groove 4-2-3 is communicated with the variable piston of the plunger pump. An oil passage hole one is arranged between the boss 4-2-1 and the frontmost flow guide groove (i.e. the first flow guide groove 4-2-2) to communicate the two, and the oil passage hole one is communicated with the inclined hole arranged on the filter seat 3-2. An oil passage hole two is arranged between the flow guide grooves and the internal cavity of the valve sleeve 4-2 along the radial direction of the valve sleeve 4-2. The oil passage hole one and the oil passage hole two are used to ensure smooth flow of oil. In this embodiment, the oil passage hole two comprises a hole one, a hole two and a hole three. The hole one is used to communicate the first flow guide groove 4-2-2 with the internal cavity of the valve sleeve 4-2, the hole two is used to communicate the second flow guide groove 4-2-3 with the internal cavity of the valve sleeve 4-2, and the hole three is used to communicate the third flow guide groove 4-2-4 with the internal cavity of the valve sleeve 4-2. The spool 4-1 is coaxially installed in the internal cavity of the valve sleeve 4-2, and the outer diameter of the spool 4-1 is equal to the diameter of the through hole in the valve sleeve 4-2. Two annular grooves with a certain length are arranged on the outer periphery of the middle section of the spool 4-1. The structure between the two annular grooves is a work shoulder 4-1-1, and the length of the work shoulder 4-1-1 is not less than the diameter of the oil passage hole two. A guide shoulder 4-1-2 is protruded from the front end of the spool 4-1 relative to the annular groove. A plurality of parts are cut off from the outer periphery of the guide shoulder 4-1-2, so as to facilitate the flow of oil. A limiting shoulder 4-1-3 is arranged at the rear end of the spool 4-1. The diameter of the limiting shoulder 4-1-3 is greater than the diameter of the through hole in the internal cavity of the valve sleeve 4-2 and smaller than the outer diameter of the valve sleeve 4-2, so as to realize the one-way axial limitation of the spool 4-1 (i.e. the limitation of the axial forward movement of the spool 4-1). A blind hole is coaxially arranged at the front end surface of the spool 4-1.

[0033] As Figure 1As shown, the control valve component 5 comprises a spring 5-1, a mounting seat 5-2 and a locking nut 5-3. The mounting seat 5-2 is screwed on the oil distribution cover 1; the locking nut 5-3 is coaxially sleeved on the outer periphery of the mounting seat 5-2, used for tightening the mounting seat 5-2 on the oil distribution cover 1 and realizing axial and radial limiting; the spring 5-1 is coaxially installed inside the mounting seat 5-2, one end of which is coaxially abutted against the valve core 4-1 and the other end is abutted against the mounting seat 5-2. In actual installation, the locking nut 5-3 is not tightened first, the mounting seat 5-2 controls the compression amount of the spring 5-1 by screwing in the depth, thereby controlling the spring force acting on the valve core 4-1, realizing accurate adjustment of the oil pressure, and after the adjustment is completed, the locking nut 5-3 is tightened to keep the spring force stable.

[0034] As shown in the figure, Figure 5 As shown, the one-way valve component 6 comprises a ball valve 6-1, a ball valve spring 6-2 and a spring seat 6-3. The ball valve 6-1, the ball valve spring 6-2 and the spring seat 6-3 are coaxially arranged in sequence. Among them, the spring seat 6-3 is screwed on the oil distribution cover 1, one end of the ball valve spring 6-2 is abutted against the spring seat 6-3, and the other end is abutted against the ball valve 6-1, in the initial state, the ball valve 6-1 is abutted against the oil inlet port of the one-way valve component 6; the oil inlet port of the one-way valve component 6 is communicated with the pump shell through the channel opened in the inside of the oil distribution cover 1, and the oil outlet port is communicated with the oil inlet port (i.e. the inlet pipe joint 7) of the plunger pump through the channel in the inside of the oil distribution cover 1. When the oil leakage pressure in the pump shell rises, the ball valve 6-1 overcomes the spring force of the ball valve spring 6-2 under the action of the oil pressure, the oil inlet port of the one-way valve component 6 is opened, allowing the oil to flow back to the oil inlet port of the pump, thereby reducing the oil leakage pressure of the pump shell and protecting the mechanical seal.

[0035] The application adopts integrated design, the oil filter component 3, the pressure valve component 4, the control valve component 5 and the one-way valve component 6 are installed in sequence between the oil inlet and outlet ports of the oil distribution cover 1, forming a compact structure, the inlet pipe joint 8 and the outlet pipe joint 7 are screwed on the oil distribution cover 1, the pump outlet is provided with a flow channel communicating with the oil filter component 3, and the oil liquid sequentially passes through the oil filter component 3, the pressure valve component 4 and the outlet of the pressure valve component 4 to the control piston of the pump. By adjusting the screwing depth of the mounting seat 5-2 of the control valve component 5 on the oil distribution cover 1, the compression amount of the spring 5-1 can be controlled, and the pressure of the hydraulic oil to the control piston can be controlled. When the oil leakage pressure in the pump shell rises, the one-way valve is automatically opened to guide the oil back to the oil inlet port of the pump, realizing pressure limiting protection.

[0036] As shown in the figure, Figure 6As shown, when the hydraulic pump is working, the high pressure oil at the pump outlet (i.e. the outlet pipe joint 8) enters the annular space between the filter element 3-1 and the oil distribution cover 1 through the flow channel on the oil distribution cover 1, and then enters the oil filtering cavity through the filtering hole on the filter element 3-1, so as to realize filtering; the oil in the oil filtering cavity flows into the flow guide groove (i.e. the first flow guide groove 4-2-2) at the front end of the valve sleeve 4-2 through the inclined hole of the filter seat 3-2 and the oil passage hole one on the valve sleeve 4-2, and then enters the annular groove between the working shoulder 4-1-1 and the guide shoulder 4-1-2 of the valve element 4-1, and the oil in the annular groove enters the blind hole on the front end face of the valve element 4-1 through the gap cut on the outer periphery of the guide shoulder 4-1-2, so as to generate a thrust on the valve element 4-1; when the pressure at the pump outlet increases, the thrust on the valve element 4-1 also increases; when the thrust of the oil is sufficient to overcome the spring force of the spring 5-1 in the control valve assembly 5, the valve element 4-1 moves, so that the annular groove between the working shoulder 4-1-1 and the guide shoulder 4-1-2 is communicated with the hole two, and the high pressure oil in the annular groove enters the next flow guide groove (i.e. the second flow guide groove 4-2-3) on the valve sleeve 4-2 through the hole two, and then enters the outlet of the pressure valve component 4, which is communicated with the variable piston of the pump through the flow channel on the oil distribution cover 1, so that the high pressure oil pushes the variable mechanism to move, and the variable function of the pump is realized. Since there is a gap between the valve element 4-1 and the valve sleeve 4-2, there is leakage during the working process, and the leaked oil flows through the annular groove between the working shoulder 4-1-1 and the limiting shoulder 4-1-3, passes through the oil passage hole two (i.e. the hole three) at the last end of the valve sleeve 4-2, reaches the last end flow guide groove (i.e. the third flow guide groove 4-2-4), passes through the oil leakage hole on the oil distribution cover 1, and enters the cavity of the pump shell.

[0037] The oil in the pump shell pushes away the ball valve 6-1 through the flow channel on the oil distribution cover 1, enters the pump inlet through the flow channel on the oil distribution cover 1, so as to realize oil supplementing of the pump, reduce the pressure of the pump shell, protect the mechanical seal, and improve the reliability of the pump. Meanwhile, the compression amount of the ball valve spring 6-2 can be controlled by adjusting the screwing depth of the spring seat 6-3 on the oil distribution cover 1, so as to control the opening pressure of the ball valve 6-1, and realize the pressure adjustable function.

[0038] Those skilled in the art can understand that the above description is only a preferred example of the application and is not used to limit the application, although the application has been described in detail with reference to the foregoing examples, and those skilled in the art can still modify the technical solutions recorded in the foregoing examples or make equivalent replacement for part of the technical features. Any modification, equivalent replacement, etc. within the spirit and principles of the application shall be included in the protection scope of the application.

Claims

1. A pressure-limited, protected, integrated aviation piston pump oil filler cap assembly, comprising: The application relates to a filter cover of a piston pump, which comprises a plug, an oil filter component, a pressure valve component, a control valve component, a one-way valve component, an inlet pipe joint and an outlet pipe joint which are coaxially arranged in a stepped through hole in the filter cover in sequence; the stepped through hole comprises a first cylindrical hole, a second cylindrical hole and a third cylindrical hole with diameters decreasing in sequence; the outlet pipe joint is communicated with an oil outlet of the piston pump, and the inlet pipe joint is communicated with an oil inlet of the piston pump; an oil inlet port of the one-way valve component is communicated with a pump shell through a channel in the filter cover, and an oil outlet port is communicated with the oil inlet of the piston pump through a flow channel in the filter cover. The plug is arranged in the first cylindrical hole and sealed with the first cylindrical hole; the oil filter component comprises a filter core and a filter seat which are arranged in the second cylindrical hole in the same diameter, the front end of the filter core is tightly attached to the plug, and the rear end of the filter core is coaxially arranged on the filter seat; an annular groove is formed in the middle section of the filter core, a flow channel is formed in the filter cover to communicate the oil outlet of the piston pump with the annular groove; a blind hole is formed in the center of the rear end surface of the filter core to form an oil filtering cavity, and a plurality of filtering holes are radially formed in the filter core to communicate the annular groove with the oil filtering cavity. The pressure valve component comprises a valve core and a valve sleeve, the valve sleeve is arranged in the third cylindrical hole in the same diameter, the front end of the valve sleeve is provided with a boss which is tightly attached to the rear end of the filter seat and is axially limited by the step between the second cylindrical hole and the third cylindrical hole; a plurality of annular flow guide grooves are formed in the outer periphery of the valve sleeve, and the adjacent flow guide grooves are sealed; one of the flow guide grooves is communicated with a variable piston of the piston pump through a channel in the filter cover according to pressure limiting requirements, and a connecting port is the outlet of the pressure valve component; a through hole is formed between the boss and the frontmost flow guide groove to realize communication, a flow channel is formed in the filter seat to realize communication between the oil filtering cavity and the through hole; a through hole is axially formed in the valve sleeve, and a through hole is radially formed in the valve sleeve to communicate the flow guide groove with the through hole, and the valve core is coaxially arranged in the through hole; two annular grooves are formed in the middle section of the valve core; a blind hole is coaxially formed in the front end surface of the valve core, and the front section is axially cut flat to communicate the blind hole with the front annular groove; a limiting shoulder is arranged at the rear end of the valve core to realize axial one-way limiting in cooperation with the valve sleeve. The control valve component is abutted with the valve core to apply an axial forward force to the valve core, and the size of the force can be adjusted within a certain range. The one-way valve component comprises a ball valve, a ball valve spring and a spring seat which are coaxially arranged in sequence; the spring seat is arranged on the filter cover, one end of the ball valve spring is abutted against the spring seat, and the other end is abutted against the ball valve; in the initial state, the ball valve is abutted against the oil inlet port of the one-way valve component.

2. The pressure-limited, protected integrated aviation piston pump oil filler cap assembly of claim 1, wherein, The control valve component comprises a spring, a mounting seat and a locking nut; the mounting seat is threadedly arranged on the filter cover; the locking nut is sleeved on the outer periphery of the mounting seat to axially and radially limit the mounting seat; the spring is coaxially arranged in the mounting seat, one end of the spring is abutted against the valve core, and the other end is abutted against the mounting seat.

3. The pressure-limited, protected integrated aviation piston pump oil filler cap assembly of claim 1, wherein, ​ 4. The pressure-limited, protected integrated aviation piston pump oil filler cap assembly of claim 1, wherein, The oil separation cover comprises an oil separation cover mounting seat, an outlet pipe mounting port, an inlet pipe mounting port and a cylindrical barrel; the outer periphery of the oil separation cover mounting seat is provided with mounting holes for mounting the oil separation cover on the plunger pump; the cylindrical barrel is fixedly connected to the surface of the oil separation cover mounting seat, and a stepped through hole is formed in the cylindrical barrel along the axial direction; the outlet pipe mounting port and the inlet pipe mounting port are formed on the surface of the oil separation cover mounting seat and are arranged on the two radial sides of the cylindrical barrel respectively; the outlet pipe mounting port is used for mounting an outlet pipe joint, and the inlet pipe mounting port is used for mounting an inlet pipe joint.

5. The pressure-limited, protected integrated aviation piston pump cowl assembly of claim 4, wherein, The outlet pipe joint is mounted in the outlet pipe mounting port by screwing, and the inlet pipe joint is mounted in the inlet pipe mounting port by screwing.

6. The pressure-limited, protected integrated aviation piston pump cowl assembly of claim 1, wherein, A sealing groove is formed in the outer periphery of the front end of the filter element, and a sealing ring is arranged in the sealing groove to realize the sealing between the filter element and the oil separation cover; a sealing groove is formed in the outer periphery of the filter seat, and a sealing ring is arranged in the sealing groove to realize the sealing between the filter seat and the oil separation cover.

7. The pressure-limited, protected integrated aviation piston pump cowl assembly of claim 1, wherein, The last end flow guide groove formed on the valve sleeve is communicated with the shell cavity of the pump through the oil leakage flow channel formed in the oil separation cover.

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