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

Abstract

The invention discloses a pressure limiting protection type integrated aviation plunger pump oil distribution cover assembly. A plug, a filter element, a filter seat, a pressure valve component and a control valve component are sequentially and coaxially arranged in an oil distribution cover. The one-way valve component is communicated with the pump shell and the oil inlet during overpressure; an annular groove is formed in the periphery of the filter element and communicated with a pump outlet, and a filter hole is formed in the radial direction and communicated with the annular groove and an internal oil filter cavity. A boss is arranged at the front end of a valve sleeve of the pressure valve component and tightly attached to the filter seat, and a flow guide groove is formed in the periphery. The flow guide groove at the foremost end is communicated with the oil filter cavity through the boss and a flow channel in the filter seat; a through hole is radially formed in the valve sleeve to communicate the diversion trench with the internal cavity; the valve element is located in the cavity, two annular grooves are formed in the periphery, a blind hole is formed in the front end face and communicated with the annular groove in the front end through the flattened position on the valve element, and a limiting shoulder is arranged at the rear end. The control valve component can apply an axially forward and adjustable force to the valve element. Pressure limiting protection, automatic oil supplementing and adjustable oil pressure can be achieved.

Description

Technical Field

[0001] The invention relates to the field of hydraulic transmission, and in particular to a pressure-limiting protection type integrated aviation plunger pump oil separation cover assembly. Background Art

[0002] As the power element of the aircraft hydraulic system, the aviation plunger pump plays a vital role in the aircraft's maneuverability and safety. In order to improve the aircraft's flight efficiency, high speed, lightweight and high pressure are the development trends of aviation plunger pumps.

[0003] At high speed, the suction of the pump inlet will cause high system noise, oil heating, cavitation of the distribution plate and other problems. In order to solve the suction problem caused by insufficient inlet pressure at high speed, the method of adding a booster impeller to the pump inlet or using oil tank pressurization is often used, but it will increase the weight of the system. On the other hand, increasing the working pressure of the system will often increase the internal oil leakage pressure of 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 performance of the pump at high speed, and reducing the oil leakage pressure of the pump are of great significance to improving the reliability of the aircraft hydraulic system. Summary of the invention

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

[0005] The specific technical solutions are as follows:

[0006] A pressure-limiting protection integrated aviation plunger pump oil separator cap assembly, comprising: an oil separator cap, a plug, an oil filter component, a pressure valve component, a control valve component coaxially arranged in sequence in a stepped through hole inside the oil separator cap, and a one-way valve component, an inlet pipe joint, and an outlet pipe joint installed on the oil separator cap; the stepped through hole comprises a first cylindrical hole, a second cylindrical hole, and a third cylindrical hole with decreasing apertures in sequence; the outlet pipe joint is connected to the oil outlet of the plunger pump, and the inlet pipe joint is connected to the oil inlet of the plunger pump; the oil inlet port of the one-way valve component is connected to the pump housing through a channel opened inside the oil separator cap, and the oil outlet port is connected to the oil inlet of the plunger pump through a flow channel inside the oil separator cap;

[0007] The plug is arranged in the first cylindrical hole and sealed therewith; the oil filter component includes a filter element and a filter seat, which are arranged in the second cylindrical hole with equal diameters, the front end of the filter element is close to the plug, and the rear end is coaxially installed on the filter seat; an annular groove is provided on the outer periphery of the middle section of the filter element, and a flow channel is provided inside the oil separation cover to connect the oil outlet of the plunger pump with the annular groove; a blind hole is axially provided 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 provided to connect the annular groove with the oil filter cavity;

[0008] The pressure valve component includes a valve core and a valve sleeve. The valve sleeve is arranged in the third cylindrical hole with equal diameter. A boss is arranged at the front end of the valve sleeve, which is tightly 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 achieve axial limit. A plurality of annular guide grooves are arranged on the outer periphery of the valve sleeve, and adjacent guide grooves are sealed. According to the pressure limiting requirement, one of the guide grooves is selected, and a channel is opened in the oil separation cover to connect the guide groove with the variable piston of the plunger pump. The connection port is the outlet of the pressure valve component. An oil through hole 1 is provided between the boss and the frontmost guide groove to achieve communication, and a flow channel is provided inside the filter seat to connect the oil filter cavity with the oil through hole 1; a through hole is axially provided inside the valve sleeve, and an oil through hole 2 is radially provided to connect the guide groove with the through hole, and the valve core is coaxially installed in the through hole; two sections of annular grooves are provided on the outer periphery of the middle section of the valve core; a blind hole is coaxially provided on the front end surface of the valve core, and the outer periphery of the front section is flattened along the axial direction to connect the blind hole with the front end annular groove; a limit shoulder is provided at the rear end of the valve core to cooperate with the valve sleeve to achieve axial one-way limit;

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

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

[0011] Furthermore, the control valve component includes: a spring, a mounting seat, and a locking nut; the mounting seat is installed on the oil separator cover through threads; the locking nut is sleeved on the outer periphery of the mounting seat to limit it axially and radially; the spring is coaxially installed inside the mounting seat, one end of which is against the valve core and the other end is against the mounting seat.

[0012] Furthermore, the oil separator cover comprises: an oil separator cover mounting seat, an outlet pipe mounting port, an inlet pipe mounting port, and a cylindrical barrel; a mounting hole is provided on the outer periphery of the oil separator cover mounting seat for installing the oil separator cover on the plunger pump; the cylindrical barrel is fixedly connected to the surface of the oil separator cover mounting seat, and a stepped through hole is provided axially inside the cylindrical barrel; the outlet pipe mounting port and the inlet pipe mounting port are provided on the surface of the oil separator cover mounting seat, and are respectively arranged on both sides of the radial direction of the cylindrical barrel; the outlet pipe mounting port is used to install the outlet pipe joint, and the inlet pipe mounting port is used to install the inlet pipe joint.

[0013] Furthermore, the outlet pipe joint is installed in the outlet pipe installation opening through threads, and the inlet pipe joint is installed in the inlet pipe installation opening through threads.

[0014] Furthermore, a sealing groove is provided at the periphery of the front end of the filter element, in which a sealing ring is arranged to achieve sealing between the filter element and the oil separator cover; a sealing groove is provided at the periphery of the filter seat, in which a sealing ring is arranged to achieve sealing between the filter seat and the oil separator cover.

[0015] Furthermore, among the guide grooves provided on the valve sleeve, the guide groove located at the rear end is communicated with the housing cavity of the pump through an oil drain channel provided in the oil separator cover.

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

[0017] (1) The present invention can achieve pressure limiting protection, automatic oil replenishment, and adjustable pressure: by cleverly setting the one-way valve assembly on the oil distribution cover, the oil in the housing can be automatically unloaded, and the oil in the pump housing can be discharged to the oil inlet of the plunger pump. On the one hand, it solves the problem of insufficient oil replenishment at the oil inlet under high-speed working conditions of the plunger pump. On the other hand, it realizes the oil unloading of the pump housing, reduces the pressure of the pump housing, and protects the mechanical seal from damage. At the same time, the opening pressure of the one-way valve component can be adjusted according to the working conditions of the plunger pump to achieve the function of adjustable pressure in the pump housing.

[0018] (2) The present invention can adjust the magnitude of the axial forward force exerted by the control valve component on the valve core according to the operating conditions of the plunger pump, thereby controlling the oil pressure flowing into the variable piston of the plunger pump through the oil filter component and the pressure valve component.

[0019] (3) The present invention adopts an integrated design, integrating the pressure valve components and the one-way valve components on the oil separator cover, thereby achieving functional integration and reducing the overall mass of the plunger pump during assembly and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a cross-sectional view of a pressure limiting protection type integrated aviation plunger pump oil separation cover assembly in an embodiment of the present invention.

[0021] Figure 2 It is a three-dimensional structural diagram of the oil separator cover in an embodiment of the present invention.

[0022] Figure 3 It is a three-dimensional partial cross-sectional view of a pressure limiting protection type integrated aviation plunger pump oil separation cover assembly in an embodiment of the present invention.

[0023] Figure 4 2 is a half-section view of the oil filter component in the embodiment of the present invention.

[0024] Figure 5 1 is a half-section view of a pressure valve component in an embodiment of the present invention.

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

[0026] In the figure, there are oil separator cover 1 and plug 2; oil filter component 3, filter element 3-1 and filter seat 3-2; pressure valve component 4, valve core 4-1, working shoulder 4-1-1, guide shoulder 4-1-2 and limit shoulder 4-1-3, valve sleeve 4-2, boss 4-2-1, first guide groove 4-2-2, second guide groove 4-2-3 and third guide groove 4-2-4; control valve component 5, spring 5-1, mounting seat 5-2 and locking nut 5-3; one-way valve component 6, ball valve 6-1, ball valve spring 6-2 and spring seat 6-3; inlet pipe joint 7 and outlet pipe joint 8. DETAILED DESCRIPTION

[0027] The present invention will be described in detail below according to the accompanying drawings and preferred embodiments, and the purpose and effect of the present invention will become more clear. The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0028] like Figure 1 As shown, a pressure-limiting protection integrated aviation plunger pump oil separator cap assembly includes: an oil separator 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 joint 7, and an outlet pipe joint 8. The plug 2, the oil filter component 3, the pressure valve component 4, and the control valve component 5 are coaxially installed in the cavity inside the oil separator cap 1 in sequence. The inlet pipe joint 8 and the outlet pipe joint 7 are installed on the oil separator cap 1 by threads, and the outlet pipe joint 7 is connected to the oil filter component 3, and the inlet pipe joint 8 is connected to the outlet of the check valve component 4.

[0029] Among them, the structure of the oil separator 1 is as follows Figure 2 As shown, the oil separator cover 1 is made of an integrated molding structure and includes: an oil separator cover mounting seat, an outlet pipe mounting port, an inlet pipe mounting port, and a cylindrical barrel. Among them, a mounting hole is provided on the outer periphery of the oil separator cover mounting seat, which is used to fix the oil separator cover assembly on the plunger pump. The cylindrical barrel is fixedly connected to the surface of the oil separator cover mounting seat (this surface is recorded as the upper surface), and a stepped through hole is provided axially inside the cylindrical barrel. The stepped through holes are the first cylindrical hole, the second cylindrical hole, and the third cylindrical hole from front to back, and the aperture sizes decrease in sequence. The outlet pipe mounting port and the inlet pipe mounting port are also provided on the upper surface of the oil separator cover mounting seat, and are respectively arranged on both radial sides of the cylindrical barrel; the outlet pipe mounting port is used to install the outlet pipe joint 8 and communicate with the pump outlet, and the inlet pipe mounting port is used to install the inlet pipe joint 7 and communicate with the pump inlet, and the installation method can be threaded installation.

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

[0031] The oil filter component 3 is installed in the second cylindrical hole, such as Figure 3As shown, the oil filter component 3 includes a coaxially arranged filter element 3-1 and a filter seat 3-2. The filter element 3-1 is a cylindrical component with an outer diameter the same as the aperture of the second cylindrical hole. Its front end is close to the plug 2, and its rear end is coaxially installed on the filter seat 3-2 to form a complete filter unit. The front end of the filter element 3-1 is provided with a sealing groove for installing a sealing ring, and a circumferential annular groove is provided on the outer periphery of the middle part, and a flow channel is provided inside the oil separator cover 1 to connect the oil outlet of the plunger pump with the annular groove; a countersunk hole is provided in the center axial direction of the rear end face of the filter element 3-1 to form an oil filter cavity, and a plurality of filter holes are radially provided on the filter element 3-1 to connect the annular groove with the oil filter cavity. The densely distributed filter holes play a role in filtering impurities in the oil. A sealing groove for installing a sealing ring is provided at the contact point between the filter seat 3-2 and the oil separator cover 1. The sealing grooves provided on the filter element 3-1 and the filter seat 3-2 respectively cooperate with the sealing ring to achieve the sealing between the oil filter component 3 and the inner wall of the oil separator cover 1. The front end of the filter seat 3-2 is coaxially provided with a blind hole and connected to the oil filter chamber, and the rear end is provided with a plurality of inclined holes for connecting to 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, such as Figure 4As shown, the pressure valve component 4 includes a coaxially arranged valve core 4-1 and a valve sleeve 4-2. The valve sleeve 4-2 is a cylindrical hollow structure with a coaxial cylindrical through hole inside, and a boss 4-2-1 is arranged at its front end. The diameter of the boss 4-2-1 is larger than the third cylindrical hole and not larger than the second cylindrical hole, so as to limit the axial backward movement of the valve sleeve 4-2; the rear end face of the filter seat 3-2 is tightly attached to the front end face of the valve sleeve 4-2 (i.e., the front end face of the boss 4-2-1), and the axial forward movement of the filter seat 3-2 is limited by the plug 2, thereby limiting the axial forward movement of the valve sleeve 4-2; in summary, the above structural design realizes the axial limitation of the valve sleeve 4-2. Several annular guide grooves are provided on the outer periphery of the valve sleeve 4-2 for oil circulation, and sealing grooves for installing sealing rings are provided between adjacent guide grooves to achieve sealing between adjacent guide grooves; in this embodiment, three guide grooves are provided, which are the first guide groove 4-2-2, the second guide groove 4-2-3, and the third guide groove 4-2-4 in order from front to back. According to the pressure limiting requirement, one of the guide grooves is selected, and a channel is opened in the oil separation cover 1 to connect the guide groove with the variable piston of the plunger pump, and the connection port is the outlet of the pressure valve component 4; in this embodiment, the second guide groove 4-2-3 is connected with the variable piston of the plunger pump. An oil hole 1 is provided between the boss 4-2-1 and the frontmost guide groove (i.e., the first guide groove 4-2-2) to connect the two, and the oil hole 1 is connected to the oblique hole provided on the filter seat 3-2; an oil hole 2 is provided between the guide groove and the internal cavity of the valve sleeve 4-2 along the radial direction of the valve sleeve 4-2, and the oil hole 1 and the oil hole 2 are used to ensure smooth flow of oil. In this embodiment, the oil hole 2 includes hole 1, hole 2, and hole 3, wherein hole 1 is used to connect the first guide groove 4-2-2 and the internal cavity of the valve sleeve 4-2, hole 2 is used to connect the second guide groove 4-2-3 and the internal cavity of the valve sleeve 4-2, and hole 3 is used to connect the third guide groove 4-2-4 and the internal cavity of the valve sleeve 4-2. The valve core 4-1 is coaxially installed inside the valve sleeve 4-2, and its outer diameter is equal to the diameter of the through hole in the valve sleeve 4-2. Two sections of annular grooves of a certain length are provided on the periphery of the middle section of the valve core 4-1. The structure between the two sections of the annular grooves is a working shoulder 4-1-1. The length of the working shoulder 4-1-1 is not less than the diameter of the second oil hole. The structure protruding from the front end of the valve core 4-1 relative to the annular groove is recorded as a guide shoulder 4-1-2. Several parts are cut off from the periphery of the guide shoulder 4-1-2 to facilitate the circulation of oil. A limit shoulder 4-1-3 is provided at the rear end of the valve core 4-1. The diameter of the limit shoulder 4-1-3 is larger than the diameter of the through hole inside the valve sleeve 4-2 and smaller than the outer diameter of the valve sleeve 4-2. It is used to realize the one-way axial limit of the valve core 4-1 (i.e., the limit of the axial forward movement of the valve core 4-1). A blind hole is coaxially provided at the front end face of the valve core 4-1.

[0033] like Figure 1As shown, the control valve component 5 includes: a spring 5-1, a mounting seat 5-2 and a locking nut 5-3. The mounting seat 5-2 is installed on the oil separator cover 1 through threads; the locking nut 5-3 is coaxially sleeved on the outer periphery of the mounting seat 5-2, and is used to tighten the mounting seat 5-2 on the oil separator cover 1 and realize axial and radial limiting; the spring 5-1 is coaxially installed inside the mounting seat 5-2, one end of which coaxially abuts against the valve core 4-1, and the other end abuts against the mounting seat 5-2. During actual installation, the locking nut 5-3 is not tightened first, and the mounting seat 5-2 controls the compression of the spring 5-1 by the screwing depth, thereby controlling the spring force acting on the valve core 4-1, and realizing precise adjustment of the oil pressure. After the adjustment is completed, tighten the locking nut 5-3 to keep the spring force stable.

[0034] like Figure 5 As shown, the one-way valve component 6 includes: 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 arranged coaxially in sequence. Among them, the spring seat 6-3 is installed on the oil separation cover 1 through threads, one end of the ball valve spring 6-2 abuts against the spring seat 6-3, and the other end abuts against the ball valve 6-1. In the initial state, the ball valve 6-1 abuts against the oil inlet port of the one-way valve component 6; the oil inlet port of the one-way valve component 6 is connected to the pump housing through the channel opened inside the oil separation cover 1, and the oil outlet port is connected to the oil inlet (i.e., the inlet pipe joint 7) of the plunger pump through the channel inside the oil separation cover 1. When the oil leakage pressure in the pump housing increases, the ball valve 6-1 overcomes the spring force of the ball valve spring 6-2 under the action of the oil pressure, and the oil inlet port of the one-way valve component 6 opens, allowing the oil to flow back to the oil inlet of the pump, thereby reducing the oil leakage pressure of the pump housing and protecting the mechanical seal.

[0035] The present invention adopts an integrated design, and the oil filter component 3, the pressure valve component 4, the control valve component 5 and the one-way valve component 6 are sequentially installed between the oil inlet and outlet of the oil separation cover 1 to form a compact structure. The inlet pipe joint 8 and the outlet pipe joint 7 are threadedly installed on the oil separation cover 1. A flow channel connected to the oil filter component 3 is opened on the pump outlet. The oil passes through the oil filter component 3 and the pressure valve component 4 in turn, and leads to the control piston of the pump through the outlet of the pressure valve component 4. By adjusting the screw-in depth of the mounting seat 5-2 of the control valve component 5 on the oil separation cover 1, the compression amount of the spring 5-1 is controlled, and the pressure of the hydraulic oil leading to the control piston can be controlled. When the oil leakage pressure in the pump housing increases, the one-way valve automatically opens to guide the oil back to the pump oil inlet to achieve pressure limiting protection.

[0036] like 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 formed between the filter element 3-1 and the oil separator 1 through the flow channel on the oil separator 1, and then enters the oil filter chamber through the filter hole on the filter element 3-1 to achieve filtration; the oil in the oil filter chamber flows through the inclined hole of the filter seat 3-2 and the oil through hole 1 on the valve sleeve 4-2, flows into the guide groove at the front end of the valve sleeve 4-2 (i.e., the first guide groove 4-2-2), and then enters the annular groove between the working shoulder 4-1-1 and the guide shoulder 4-1-2 of the valve core 4-1 through the hole 1, and the oil in the annular groove enters the notch cut out of the outer periphery of the guide shoulder 4-1-2 through the notch opened on the front end surface of the valve core 4-1. In the blind hole, a thrust is generated on the valve core 4-1. When the pump outlet pressure increases, the thrust generated on the valve core 4-1 also increases. When the thrust generated by the oil is sufficient to overcome the spring force of the spring 5-1 in the control valve assembly 5, the valve core 4-1 moves, so that the annular groove between the working shoulder 4-1-1 and the guide shoulder 4-1-2 is connected to the second hole. The high-pressure oil inside the annular groove will enter the next guide groove (i.e., the second guide groove 4-2-3) on the valve sleeve 4-2 through the second hole, and then enter the outlet of the pressure valve component 4. The outlet is connected to the variable piston of the pump through the flow channel on the oil distributor cover 1. The high-pressure oil drives the variable mechanism to move, thereby realizing the variable of the pump. Since there is a gap between the valve core 4-1 and the valve sleeve 4-2, leakage occurs during operation. The leaked oil flows through the annular grooves of the working shoulder 4-1-1 and the limit shoulder 4-1-3, through the oil hole 2 (i.e., hole 3) at the rear end of the valve sleeve 4-2, reaches the guide groove at the rear end (i.e., the third guide groove 4-2-4), and enters the housing cavity of the pump through the oil drain hole on the oil separator cover 1.

[0037] After the oil in the pump housing pushes open the ball valve 6-1 through the flow channel on the oil separation cover 1, it enters the pump inlet through the flow channel on the oil separation cover 1, which can realize the oil replenishment of the pump, and at the same time can reduce the pressure of the pump housing, protect the mechanical seal, and improve the reliability of the pump. At the same time, according to the working conditions of the plunger pump, the screwing depth of the spring seat 6-3 on the oil separation cover 1 can be adjusted to control the compression amount of the ball valve spring 6-2, thereby controlling the opening pressure of the ball valve 6-1 and realizing the pressure adjustable function.

[0038] Those skilled in the art can understand that the above are only preferred examples of the invention and are not intended to limit the invention. Although the invention is described in detail with reference to the above examples, those skilled in the art can still modify the technical solutions recorded in the above examples or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, etc. made within the spirit and principle of the invention shall be included in the protection scope of the invention.

Claims

1. A pressure-limiting protection integrated aviation plunger pump oil separation cover assembly, characterized in that: include: An oil separator cap, a plug, an oil filter component, a pressure valve component, a control valve component coaxially arranged in sequence in the stepped through hole inside the oil separator cap, and a one-way valve component, an inlet pipe joint, and an outlet pipe joint installed on the oil separator cap; the stepped through hole comprises a first cylindrical hole, a second cylindrical hole, and a third cylindrical hole with decreasing apertures in sequence; the outlet pipe joint is connected to the oil outlet of the plunger pump, and the inlet pipe joint is connected to the oil inlet of the plunger pump; the oil inlet port of the one-way valve component is connected to the pump housing through a channel opened inside the oil separator cap, and the oil outlet port is connected to the oil inlet of the plunger pump through a flow channel inside the oil separator cap; The plug is arranged in the first cylindrical hole and sealed therewith; the oil filter component includes a filter element and a filter seat, which are arranged in the second cylindrical hole with equal diameters, the front end of the filter element is close to the plug, and the rear end is coaxially installed on the filter seat; an annular groove is provided on the outer periphery of the middle section of the filter element, and a flow channel is provided inside the oil separation cover to connect the oil outlet of the plunger pump with the annular groove; a blind hole is axially provided 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 provided to connect the annular groove with the oil filter cavity; The pressure valve component includes a valve core and a valve sleeve. The valve sleeve is arranged in the third cylindrical hole with equal diameter. A boss is arranged at the front end of the valve sleeve, which is tightly 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 achieve axial limit. A plurality of annular guide grooves are arranged on the outer periphery of the valve sleeve, and adjacent guide grooves are sealed. According to the pressure limiting requirement, one of the guide grooves is selected, and a channel is opened in the oil separation cover to connect the guide groove with the variable piston of the plunger pump. The connection port is the outlet of the pressure valve component. An oil through hole 1 is provided between the boss and the frontmost guide groove to achieve communication, and a flow channel is provided inside the filter seat to connect the oil filter cavity with the oil through hole 1; a through hole is axially provided inside the valve sleeve, and an oil through hole 2 is radially provided to connect the guide groove with the through hole, and the valve core is coaxially installed in the through hole; two sections of annular grooves are provided on the outer periphery of the middle section of the valve core; a blind hole is coaxially provided on the front end surface of the valve core, and the outer periphery of the front section is flattened along the axial direction to connect the blind hole with the front end annular groove; a limit shoulder is provided at the rear end of the valve core to cooperate with the valve sleeve to achieve axial one-way limit; The control valve component abuts against the valve core and is used to apply an axial forward force to the valve core, and the magnitude of the force can be adjusted within a certain range.

2. The pressure limiting protection integrated aviation plunger pump oil separation cover assembly according to claim 1 is characterized in that: The one-way valve component includes a ball valve, a ball valve spring, and a spring seat which are coaxially arranged in sequence; 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. In the initial state, the ball valve abuts against the oil inlet port of the one-way valve component.

3. The pressure limiting protection integrated aviation plunger pump oil separation cover assembly according to claim 1, characterized in that: The control valve component includes: a spring, a mounting seat, and a locking nut; the mounting seat is installed on the oil separator cover through threads; the locking nut is sleeved on the outer circumference of the mounting seat to limit its axial and radial position; the spring is coaxially installed inside the mounting seat, one end of which abuts against the valve core and the other end abuts against the mounting seat.

4. The pressure limiting protection integrated aviation plunger pump oil separation cover assembly according to claim 1, characterized in that: The oil separator cover comprises: an oil separator cover mounting seat, an outlet pipe mounting opening, an inlet pipe mounting opening, and a cylindrical barrel; a mounting hole is provided on the outer circumference of the oil separator cover mounting seat for mounting the oil separator cover on the plunger pump; the cylindrical barrel is fixedly connected to the surface of the oil separator cover mounting seat, and a stepped through hole is provided inside the cylindrical barrel along the axial direction; the outlet pipe mounting opening and the inlet pipe mounting opening are provided on the surface of the oil separator cover mounting seat, and are respectively arranged on both sides of the radial direction of the cylindrical barrel; the outlet pipe mounting opening is used to install the outlet pipe joint, and the inlet pipe mounting opening is used to install the inlet pipe joint.

5. The pressure limiting protection integrated aviation plunger pump oil separation cover assembly according to claim 4, characterized in that: The outlet pipe joint is installed in the outlet pipe installation opening through threads, and the inlet pipe joint is installed in the inlet pipe installation opening through threads.

6. The pressure limiting protection integrated aviation plunger pump oil separation cover assembly according to claim 1, characterized in that: A sealing groove is provided on the periphery of the front end of the filter element, in which a sealing ring is arranged to achieve sealing between the filter element and the oil separation cover; a sealing groove is provided on the periphery of the filter seat, in which a sealing ring is arranged to achieve sealing between the filter seat and the oil separation cover.

7. The pressure limiting protection integrated aviation plunger pump oil separation cover assembly according to claim 1, characterized in that: Among the guide grooves provided on the valve sleeve, the guide groove at the rear end is communicated with the housing cavity of the pump through an oil drain channel provided in the oil separator cover.

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