High-pressure valve element oil filter mechanism of constant-pressure fuel plunger pump

Abstract

The invention relates to the technical field of fuel system oil pressure adjustment. The invention discloses a constant-pressure fuel oil plunger pump high-pressure valve element oil filter mechanism which comprises a valve sleeve, an axial hole channel is formed in the valve sleeve, an oil distribution valve ejector rod is arranged in the axial hole channel, and a control gap is formed between the oil distribution valve ejector rod and the inner wall of the axial hole channel; an oil way hole A and an oil way hole B which are through in the radial direction are formed in the outer wall of the valve sleeve, corresponding stepped holes are formed in the inner wall of the valve sleeve, and the stepped holes communicate with the oil way hole A and the oil way hole B correspondingly. A plug is arranged at one end of the valve sleeve, and a control cavity is arranged between the valve sleeve and the plug. According to the invention, the cleanliness of the working medium entering the high-pressure valve gap in the fuel pump is improved, the effect of preventing solid particle pollutants from entering the valve gap to cause the inflexible clamping motion of the valve can be achieved, and the stable, efficient and accurate control of the high-pressure valve is effectively ensured.

Description

Technical Field

[0001] This invention relates to the field of fuel system oil pressure regulation technology, and in particular to a mechanism that enables the fuel pump pressure regulation system to provide stable pressure to the engine control system and achieve precise regulation. Background Technology

[0002] Currently, based on the development trends and needs of future fighter jets and engines, higher requirements are being placed on the high-pressure, high-flow piston pumps that are used in their production. In addition to requiring them to be small in size, light in weight, have high system power, and a wide pressure adjustment range, they also need to have higher resistance to media contamination. To meet the requirements of the fuel system, piston pumps must be developed in the direction of faster control response and improved resistance to media contamination.

[0003] In the existing technology, the working medium of high-pressure, high-flow fuel plunger pumps is No. 3 jet fuel. The cleanliness of the medium is an important factor in determining whether the plunger pump can work properly. Plunger pump failures caused by medium contamination are emerging one after another. Therefore, it is urgent to improve the ability of fuel plunger pump pressure regulating mechanism to resist medium contamination. Summary of the Invention

[0004] The purpose of this invention is to provide a high-pressure valve core filter mechanism for a constant-pressure fuel plunger pump. When the high-pressure oil from the plunger pump outlet enters the high-pressure control valve through the control oil circuit, the filter assembly integrated inside filters out solid particulate contaminants in the medium, ensuring that the medium entering the valve gap has a high degree of cleanliness. This effectively prevents particulate matter from jamming the valve and causing it to move inflexibly. It enables the high-pressure valve to achieve stable, efficient, and precise control even under conditions of relatively high medium contamination, ensuring the stability and accuracy of the plunger pump's pressure supply to the system.

[0005] To solve the above-mentioned technical problems, the present invention provides a high-pressure valve core filter mechanism for a constant pressure fuel plunger pump, including a valve sleeve. The valve sleeve has an axial channel inside, and an oil distribution valve push rod is provided within the axial channel. A control clearance is provided between the oil distribution valve push rod and the inner wall of the axial channel. The outer wall of the valve sleeve has radially penetrating oil passage holes A and B, and the inner wall has corresponding stepped holes, which communicate with oil passage holes A and B respectively. One end of the valve sleeve is provided with… The valve has a screw plug, and a control chamber is provided between the valve sleeve and the screw plug. The control chamber contains an oil filter assembly for filtering the working medium flowing in through oil passage A and then conveying it to the control chamber. The oil filter assembly includes a bushing installed inside the valve sleeve. Inside the bushing, along the direction of medium flow, a gasket, a fine filter screen, and a coarse filter screen are arranged sequentially. The fine filter screen is adjacent to oil passage A and is used to filter solid particles in the medium. The coarse filter screen is located downstream of the fine filter screen to bear pressure and prevent damage to the fine filter screen. The gasket is located at the end of the coarse filter screen for positioning. The working medium enters through oil passage A, and after being filtered through the fine and coarse filter screens of the oil filter assembly, it pushes the oil distributor valve rod to move axially, causing the high-pressure control oil to flow out through the stepped hole and oil passage B.

[0006] The oil separator valve rod can move axially within the axial channel.

[0007] The plug is screwed into the end of the valve sleeve to axially press and fix the oil filter assembly in the installation position.

[0008] The coarse filter screen has fewer mesh openings than the fine filter screen.

[0009] The bushing and the valve sleeve are either interference fit or threaded connection.

[0010] Both the coarse and fine filter screens are cylindrical mesh structures, coaxially sleeved inside the bushing.

[0011] The control clearance is a sliding fit clearance.

[0012] Compared with the prior art, this invention improves the cleanliness of the working medium entering the high-pressure valve gap in the fuel pump, which can prevent solid particulate contaminants from entering the valve gap and causing valve jamming and inflexible movement, effectively ensuring stable, efficient and precise control of the high-pressure valve.

[0013] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0014] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0015] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 yes Figure 1 A schematic diagram of the structure of the intermediate oil filter assembly.

[0016] In the diagram: 1-Oil distributor valve push rod, 2-Valve sleeve, 3-Oil passage hole A, 4-Oil filter assembly, 5-Plug, 6-Step hole, 7-Oil passage hole B, 8-Bushing, 9-Coarse filter screen, 10-Fine filter screen, 11-Washer. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the embodiments of this invention will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details are presented in the embodiments of this invention to facilitate a better understanding of this application. However, the technical solutions claimed in this application can be implemented even without these technical details and various variations and modifications based on the following embodiments. The division of the following embodiments is for ease of description and should not constitute any limitation on the specific implementation of this invention. The embodiments can be combined with and referenced by each other without contradiction.

[0018] like Figure 1 and 2 The diagram illustrates a high-pressure valve core filter mechanism for a constant-pressure fuel plunger pump, comprising a valve sleeve 2. The valve sleeve 2 has an axial channel inside, within which a distributor valve push rod 1 is installed, with a control clearance between the distributor valve push rod 1 and the inner wall of the axial channel. The outer wall of the valve sleeve 2 has radially penetrating oil passage holes A3 and B7, and the inner wall has corresponding stepped holes 6, which communicate with oil passage holes A3 and B7 respectively. A screw plug 5 is provided at one end of the valve sleeve 2, and the valve sleeve 2 connects to the screw plug. A control chamber is provided between 5; the control chamber is provided with an oil filter assembly 4 for filtering the working medium flowing in from the oil passage A3 and then conveying it to the control chamber; the oil filter assembly 4 includes a bushing 8 installed in the valve sleeve 2, and a gasket 11, a fine filter screen 10 and a coarse filter screen 9 are arranged sequentially in the direction of medium flow in the bushing 8; the fine filter screen 10 is adjacent to the oil passage A3 and is used to filter solid particles in the medium, the coarse filter screen 9 is located downstream of the fine filter screen 10 and is used to bear pressure and prevent the fine filter screen 10 from breaking, and the gasket 11 is located at the end of the coarse filter screen 9 for positioning; The working medium enters through the oil passage hole A3, and after being filtered through the fine filter screen 10 and the coarse filter screen 9 of the oil filter assembly 4, it pushes the oil distribution valve push rod 1 to move axially, so that the high-pressure control oil flows out through the step hole 6 and the oil passage hole B7.

[0019] The oil distribution valve top rod 1 can move axially within the axial channel.

[0020] The plug 5 is screwed into the end of the valve sleeve 2 to axially press and fix the oil filter assembly 4 in the installation position.

[0021] The number of mesh openings in the coarse filter 9 is less than the number of mesh openings in the fine filter 10.

[0022] The bushing 8 and the valve sleeve 2 are either interference fit or threaded connection.

[0023] Both the coarse filter 9 and the fine filter 10 are cylindrical mesh structures, coaxially sleeved inside the bushing 8.

[0024] The control clearance is a sliding fit clearance.

[0025] The working process of this invention is as follows: Under the pressure of the booster main line, the working oil passes through oil passage A3 and then through the oil filter assembly 4 to supply the oil distributor valve push rod 1. The oil distributor valve push rod 1 can move in the axial direction of the valve sleeve 2. When the working fluid passes through the oil filter assembly 4, the high-pressure control oil first passes through the fine filter screen 10 and then through the coarse filter screen 9 (the fine filter screen 10 filters the oil, and the coarse filter screen 9 bears pressure and force to prevent the fine filter screen from breaking). This filters out metal particulate contaminants in the working medium that can cause jamming between the oil distributor valve push rod 1 and the valve sleeve 2. The clean working medium pushes the valve push rod 1 to move axially, allowing the high-pressure control oil to enter the stepped hole 6. Then, the high-pressure control oil enters the follower piston chamber through the oil passage B7 to drive the swashplate to achieve variable regulation.

[0026] In summary, this invention can filter the working medium entering the high-pressure valve of the constant-pressure fuel pump, preventing solid particulate contaminants from entering the valve gap and causing the high-pressure valve to jam or become magnetized, thereby ensuring the normal operation of the constant-pressure fuel pump. It also has the following advantages: 1. Compact and simple structure, small size, and low cost; 2. It can effectively prevent high-pressure valve jamming and magnetization problems, greatly improve the control quality of plunger pump oil supply pressure, and provide stable pressure for engine fuel and control system.

[0027] Those skilled in the art will understand that the above embodiments can be modified in form and detail in practical applications without departing from the spirit and scope of the invention.

Claims

1. A high-pressure valve core oil filter mechanism for a constant-pressure fuel plunger pump, characterized in that: The system includes a valve sleeve (2), which has an axial channel inside. An oil distribution valve push rod (1) is provided within the axial channel, and a control gap is provided between the oil distribution valve push rod (1) and the inner wall of the axial channel. The outer wall of the valve sleeve (2) has radially penetrating oil passage holes A (3) and B (7), and the inner wall has corresponding stepped holes (6), which are connected to oil passage holes A (3) and B (7) respectively. One end of the valve sleeve (2) is provided with a screw plug (5), and a control cavity is provided between the valve sleeve (2) and the screw plug (5). The cavity is provided with an oil filter assembly (4) for filtering the working medium flowing in from the oil passage hole A (3) and conveying it to the control cavity; the oil filter assembly (4) includes a bushing (8) installed in the valve sleeve (2), and a gasket (11), a fine filter screen (10) and a coarse filter screen (9) are arranged in sequence along the medium flow direction in the bushing (8); the fine filter screen (10) is adjacent to the oil passage hole A (3) and is used to filter solid particles in the medium; the coarse filter screen (9) is set downstream of the fine filter screen (10) and is used to bear pressure and prevent the fine filter screen (10) from breaking; the gasket (11) is set at the end of the coarse filter screen (9) and is used for positioning; The working medium enters through the oil passage hole A (3), and after being filtered by the fine filter screen (10) and coarse filter screen (9) of the oil filter assembly (4), it pushes the oil distribution valve push rod (1) to move axially, so that the high pressure control oil flows out through the step hole (6) and the oil passage hole B (7).

2. The constant pressure fuel plunger pump high-pressure valve core oil filter mechanism as described in claim 1, characterized in that: The oil distribution valve top rod (1) can move axially within the axial channel.

3. The constant pressure fuel plunger pump high-pressure valve core oil filter mechanism as described in claim 1, characterized in that: The plug (5) is screwed into the end of the valve sleeve (2) to axially press and fix the oil filter assembly (4) in the installation position.

4. The constant pressure fuel plunger pump high-pressure valve core oil filter mechanism as described in claim 1, characterized in that: The number of mesh openings in the coarse filter (9) is less than the number of mesh openings in the fine filter (10).

5. The constant pressure fuel plunger pump high-pressure valve core oil filter mechanism as described in claim 1, characterized in that: The bushing (8) and the valve sleeve (2) are either interference fit or threaded connection.

6. The constant pressure fuel plunger pump high-pressure valve core oil filter mechanism as described in claim 1, characterized in that: Both the coarse filter (9) and the fine filter (10) are cylindrical mesh structures, coaxially sleeved inside the bushing (8).

7. The constant pressure fuel plunger pump high-pressure valve core oil filter mechanism as described in claim 1, characterized in that: The control clearance is a sliding fit clearance.

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