Compression amount dynamic adjusting device, fuel pump inlet rotary plate valve and method

Abstract

The invention discloses a compression amount dynamic adjusting device, a fuel pump inlet rotary plate valve and a method. An inlet (15) is formed in the inlet cover plate (1), an energy storage cavity (14) is concentrically formed in the periphery of the inlet (15), an energy storage sealing ring (2) capable of moving in the axial direction is arranged on the inner edge of the energy storage cavity (14), an arc-shaped piston cavity (7) is concentrically formed in the periphery of the energy storage cavity (14), an arc-shaped piston (4) is slidably connected into the piston cavity (7), one end of the piston cavity (7) is communicated with the energy storage cavity (14) through a sealing air channel (3), and the other end of the piston cavity (7) is communicated with a brake cavity (9) through a brake air channel (6). A brake (5) capable of moving in the axial direction is arranged in the brake cavity (9). A window (16) concentric with the energy storage cavity (14) is formed in the position, on the surface of the inlet cover plate (1), of the piston cavity (7), an insertion hole (12) is formed in the piston (4), and the movement range of the insertion hole (12) is restrained by the window (16). The sealing device has the characteristics of good sealing effect and high equipment maintainability.

Description

Technical Field

[0001] The present invention belongs to the field of aviation fuel pumps, and particularly relates to a device for dynamically adjusting the compression amount of a fuel pump, an inlet rotary vane valve of a fuel pump, and a method therefor. Background Art

[0002] A fuel pump is a core component of an aviation fuel system. To improve the supportability and maintainability of the fuel pump, the fuel pump is generally designed as a split structure that can be disassembled into a pump housing and a pump core.

[0003] To achieve the function of self-sealing during installation and disassembly, a check valve is often provided at the inlet of the pump housing. When the pump core is removed, the check valve of the pump housing closes to isolate external fuel from entering the pump housing; after the pump core is installed, the check valve at the inlet of the pump housing needs to be opened so that working media such as fuel or gas in the fuel tank can enter the pump through the inlet valve of the pump housing.

[0004] Currently, the commonly used inlet valves of the pump housing are of two structures: plunger type and rotary vane type. In recent years, the rotary vane type inlet valve has become the mainstream. The rotary vane valve has the characteristic of small inlet flow resistance, which can reduce the frictional loss along the way before the impeller, increase the pressure at the inlet of the impeller, and is very beneficial to the high-altitude cavitation resistance of the pump.

[0005] However, the sealing performance of the rotary vane valve depends on the compression amount of the rotary vane on the energy storage sealing ring. The tighter the rotary vane is attached to the energy storage sealing ring, the greater the compression amount of the energy storage sealing ring and the better the sealing performance, but the greater the torque required for opening, which is not conducive to the maintainability of the equipment. Summary of the Invention

[0006] The purpose of the present invention is to provide a device for dynamically adjusting the compression amount, an inlet rotary vane valve of a fuel pump, and a method therefor. The present invention has the characteristics of good sealing effect and high maintainability of the equipment.

[0007] The technical solution of the present invention. A device for dynamically adjusting the compression amount for an inlet rotary vane valve of a fuel pump includes an inlet cover plate. An inlet is provided on the inlet cover plate, and an energy storage cavity is concentrically provided around the inlet. An axially movable energy storage sealing ring is provided along the energy storage cavity. An arc-shaped piston cavity is concentrically provided on the outer periphery of the energy storage cavity. An arc-shaped piston is slidably connected in the piston cavity. One end of the piston cavity is communicated with the energy storage cavity through a sealing air passage, and the other end is communicated with a brake cavity through a brake air passage. A brake that can move axially is provided in the brake cavity; a window concentric with the energy storage cavity is provided on the surface of the inlet cover plate for the piston cavity, and a jack is provided on the piston, and the movement range of the jack is restricted by the window.

[0008] In the aforementioned device for dynamically adjusting the compression amount, the energy storage sealing ring and the brake are made of plastic or rubber.

[0009] A fuel pump inlet rotary vane valve equipped with the aforementioned dynamic adjustment device for compression amount. A rotary vane is rotatably connected to the inlet cover plate for opening / closing the inlet; a driving groove is provided on the rotary vane, and the driving groove is near the window.

[0010] The working method of the aforementioned fuel pump inlet rotary vane valve. The opening process of the fuel pump inlet rotary vane valve is as follows:

[0011] When the pump core is installed in the volute, the dial rod of the pump core passes through the driving groove and inserts into the jack; the pump core rotates clockwise, driving the dial rod to rotate clockwise around the inlet axis, thereby driving the piston to move in the piston cavity, and at the same time driving the rotary vane to rotate through the driving groove to gradually open the inlet.

[0012] In the working method of the aforementioned fuel pump inlet rotary vane valve, during the opening process, the gas in the cavity on the side of the piston cavity communicating with the energy storage cavity is stretched, generating a suction force. The gas in the energy storage cavity is sucked through the sealed air passage, causing the energy storage sealing ring to move towards the bottom of the energy storage cavity. The compression amount between the energy storage sealing ring and the rotary vane decreases, the friction force between the energy storage sealing ring and the rotary vane decreases, the torque required for the pump core to rotate is smaller, and the pump core rotates more easily.

[0013] In the working method of the aforementioned fuel pump inlet rotary vane valve, during the opening process, the gas in the cavity on the side of the piston cavity communicating with the brake cavity is compressed, and the compressed gas surges towards the brake cavity through the brake air passage, driving the brake to move towards the outside of the brake cavity and gradually contact the rotary vane to provide a braking force for the rotary vane.

[0014] In the working method of the aforementioned fuel pump inlet rotary vane valve, the closing process of the fuel pump inlet rotary vane valve is as follows:

[0015] When the pump core is removed from the volute, the pump core rotates counterclockwise, driving the dial rod to rotate counterclockwise around the inlet axis, thereby driving the piston to move in the piston cavity, and at the same time driving the rotary vane to rotate through the driving groove, sliding away from the brake, sliding towards the energy storage sealing ring direction, and gradually closing the inlet.

[0016] In the working method of the aforementioned fuel pump inlet rotary vane valve, during the closing process, the gas in the cavity on the side of the piston cavity communicating with the brake cavity is stretched, generating a suction force. The gas in the brake cavity is sucked through the brake air passage, causing the brake to move towards the bottom of the brake cavity, thereby separating the brake from the rotary vane, and the braking force disappears, making the rotary vane slide more easily.

[0017] In the working method of the aforementioned fuel pump inlet rotary vane valve, during the closing process, the gas in the cavity on the side of the piston cavity communicating with the energy storage cavity is compressed, and the compressed gas surges into the energy storage cavity through the sealed air passage, pushing the energy storage sealing ring towards the rotary vane direction, contacting and gradually pressing the rotary vane, and increasing the compression amount of the energy storage sealing ring.

[0018] Beneficial effects: The present invention designs a structure for dynamically adjusting the compression amount of the imported rotary plate valve, which can achieve the dynamic adjustment of the compression amount of the energy storage sealing ring of the imported rotary plate valve of the split fuel pump housing. When the pump core is removed and the sealing effect needs to be ensured, the imported rotary plate valve of the pump housing is closed, and the compression amount of the energy storage sealing ring is large, ensuring the sealing effect of the imported rotary plate valve. When the rotary plate valve is opened, the compression amount of the energy storage sealing ring is reduced, effectively reducing the friction force of the rotary plate sliding on the energy storage sealing ring, reducing the opening torque of the rotary plate valve, and improving the maintainability of the equipment. Brief Description of the Drawings

[0019] Figure 1 is a schematic structural diagram of the structure for dynamically adjusting the compression amount of the imported rotary plate valve of the present invention;

[0020] Figure 2 is a cross-sectional view of the structure for dynamically adjusting the compression amount of the imported rotary plate valve;

[0021] Figure 3 is a schematic structural diagram of the sealing air passage and the braking air passage of the structure for dynamically adjusting the compression amount of the imported rotary plate valve;

[0022] Figure 4 is a schematic structural diagram of the piston. Detailed Description of the Invention

[0023] The present invention will be further described in detail below through specific embodiments.

[0024] Embodiment 1. A device for dynamically adjusting the compression amount of a fuel pump, see Figures 1-4 , including an inlet cover plate 1, an energy storage sealing ring 2, a sealing air passage 3, a piston 4, a brake 5, a braking air passage 6, a piston chamber 7, a sealing ring A 8 installed on the sealing ring groove 13 of the piston 4, a braking chamber 9, a sealing ring B 10 installed on the brake 5, a jack 12, an energy storage chamber 14, an inlet 15, and a window 16; an inlet 15 is provided on the inlet cover plate 1, an energy storage chamber 14 is concentrically provided around the inlet 15, an axially movable energy storage sealing ring 2 is provided along the inner edge of the energy storage chamber 14, an arc-shaped piston chamber 7 is concentrically arranged outside the energy storage chamber 14, an arc-shaped piston 4 is slidably connected in the piston chamber 7, one end of the piston chamber 7 is communicated with the energy storage chamber 14 through a sealing air passage 3, the other end is communicated with the braking chamber 9 through a braking air passage 6, and a brake 5 capable of moving axially is provided in the braking chamber 9; a window 16 concentric with the energy storage chamber 14 is opened on the surface of the inlet cover plate 1 for the piston chamber 7, and a jack 12 is provided on the piston 4, and the movement range of the jack 12 is restricted by the window 16.

[0025] The energy storage sealing ring 2 and the brake 5 are made of plastic or rubber.

[0026] The inlet rotary vane valve of the fuel pump installed with the aforementioned dynamic adjustment device for compression amount has a rotary vane 11 rotatably connected to the inlet cover plate 1 for opening / closing the inlet 16; a driving groove 17 is provided on the rotary vane 11, and the driving groove 17 is located near the window 16.

[0027] Process of opening the inlet rotary vane valve:

[0028] When the pump core is installed into the volute, the lever 18 of the pump core passes through the rotary vane 11 and inserts into the jack 12 of the piston 4; the pump core rotates clockwise, driving the lever 18 to rotate, and the rotation of the lever 18 drives the piston 4 to move in the piston chamber 7; the pump core rotates clockwise and simultaneously drives the rotary vane 11 to rotate, sliding away from the energy storage sealing ring 2 and sliding towards the direction of the brake 5, and the inlet rotary vane valve starts to open.

[0029] The piston 4 moves clockwise in the piston chamber 7, the gas in the left chamber of the piston 4 is stretched, generating a suction force, sucking the gas in the energy storage chamber 14 through the sealed air duct 3, a pressure difference is generated between the left and right sides of the energy storage sealing ring 2, and under the action of the pressure difference on both sides, the energy storage sealing ring 2 moves towards the bottom of the groove of the energy storage chamber 14, the compression amount between the energy storage sealing ring 2 and the rotary vane 11 decreases, the friction force between the energy storage sealing ring 2 and the rotary vane 11 decreases, the torque required for the pump core to rotate is smaller, and the pump core rotates more easily;

[0030] At the same time, the piston 4 moves clockwise in the piston chamber 7, the gas in the right chamber of the piston 4 is compressed, and the compressed gas surges towards the brake chamber 9 through the brake air duct 6, a pressure difference is generated between the left and right sides of the brake 5, and under the action of the pressure difference on both sides, the brake 5 moves towards the outside of the right brake chamber 9, and the brake 5 (which can be used for anti-vibration) moves towards the rotary vane 11; contacts the rotary vane 11 rotated to this position, provides a braking force for the rotary vane 11, prevents the rotary vane 11 from displacing, and the inlet rotary vane valve is fully opened.

[0031] Process of closing the inlet rotary vane valve:

[0032] When the pump core is removed from the volute, the pump core rotates counterclockwise, driving the lever 18 to rotate counterclockwise, and the rotation of the lever 18 drives the piston 4 to rotate counterclockwise in the piston chamber 7; the pump core rotates counterclockwise and simultaneously drives the rotary vane 11 to rotate counterclockwise, sliding away from the brake 5 and sliding towards the direction of the energy storage sealing ring 2, and the inlet rotary vane valve starts to close.

[0033] The piston 4 rotates counterclockwise in the piston chamber 7, the piston 4 rotates counterclockwise in the piston chamber 7, the gas in the right chamber of the piston 4 is stretched, sucking the gas in the brake chamber 9 through the brake air duct 6, a pressure difference is generated between the left and right sides of the brake 5, and under the action of the pressure difference on both sides, the brake 5 moves towards the bottom of the left brake chamber 9, the brake 5 disengages from the rotary vane 11, the braking force disappears, and the rotary vane 11 slides more easily.

[0034] Meanwhile, the gas in the left cavity of the piston 4 is compressed, and the compressed gas floods into the energy storage cavity 14 through the sealed air passage 3. A pressure difference is generated between the left and right sides of the energy storage sealing ring 2. Under the action of the pressure difference on both sides, the energy storage sealing ring 2 moves towards the swash plate 11, contacts and presses against the swash plate 11 rotated to this position. The compression amount of the energy storage sealing ring 2 and the swash plate 11 increases, ensuring the reliable sealing of the inlet swash plate valve.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be covered within the protection scope of the present invention.

Claims

1. A compression amount dynamic adjustment device for a rotary vane valve at the fuel pump inlet, characterized in that It includes an inlet cover plate (1). An inlet (15) is provided on the inlet cover plate (1). A energy storage cavity (14) is concentrically arranged around the inlet (15). An energy storage sealing ring (2) capable of axially moving is arranged along the inner edge of the energy storage cavity (14). An arc-shaped piston cavity (7) is concentrically arranged on the outer periphery of the energy storage cavity (14). An arc-shaped piston (4) is slidably connected in the piston cavity (7). One end of the piston cavity (7) is communicated with the energy storage cavity (14) through a sealing air passage (3), and the other end is communicated with a braking cavity (9) through a braking air passage (6). A brake (5) capable of axially moving is arranged in the braking cavity (9); a window (16) concentric with the energy storage cavity (14) is opened on the surface of the inlet cover plate (1) for the piston cavity (7). An insertion hole (12) is provided on the piston (4), and the movement range of the insertion hole (12) is restricted by the window (16).

2. The compression amount dynamic adjustment device according to claim 1, characterized in that The energy storage sealing ring (2) and the brake (5) are made of plastic or rubber.

3. A fuel pump inlet rotary vane valve equipped with the compression amount dynamic adjustment device according to claim 1 or 2, characterized in that A rotating plate (11) is rotatably connected to the inlet cover plate (1) for opening / closing the inlet (16); a driving groove (17) is provided on the rotating plate (11), and the driving groove (17) is located near the window (16).

4. A working method of the inlet rotary vane valve of a fuel pump as described in claim 3, characterized in that, The opening process of the fuel pump inlet rotating plate valve is as follows: When the pump core is installed in the volute, the lever (18) of the pump core passes through the driving groove (17) and inserts into the insertion hole (12); the pump core rotates clockwise, driving the lever (18) to rotate clockwise around the inlet axis, thereby driving the piston (4) to move in the piston cavity (7), and at the same time driving the rotating plate (11) to rotate through the driving groove (17) to gradually open the inlet (15).

5. The working method of the inlet rotary vane valve of the fuel pump according to claim 4, characterized in that, During the opening process, the gas in the cavity on the side of the piston cavity (7) communicated with the energy storage cavity (14) is stretched, generating a suction force. The gas in the energy storage cavity (14) is sucked through the sealing air passage (3), causing the energy storage sealing ring (2) to move towards the bottom of the energy storage cavity (14). The compression amount between the energy storage sealing ring (2) and the rotating plate (11) is reduced, and the friction force between the energy storage sealing ring (2) and the rotating plate (11) is reduced. The torque required for the pump core to rotate is smaller, and the pump core rotates more easily.

6. The working method of the inlet rotary vane valve of the fuel pump according to claim 4, characterized in that, During the opening process, the gas in the cavity on the side of the piston cavity (7) communicated with the braking cavity (9) is compressed, and the compressed gas surges into the braking cavity (9) through the braking air passage (6), driving the brake (5) to move outwards from the braking cavity (9) and gradually contact the rotating plate (11) to provide a braking force for the rotating plate (11).

7. The working method of the inlet rotary vane valve of the fuel pump according to claim 4, characterized in that, The closing process of the fuel pump inlet rotating plate valve is as follows: When the pump core is removed from the volute, the pump core rotates counterclockwise, driving the lever (18) to rotate counterclockwise around the inlet axis, thereby driving the piston (4) to move in the piston cavity (7), and at the same time driving the rotating plate (11) to rotate through the driving groove (17), sliding away from the brake (5) and sliding towards the energy storage sealing ring (2) direction to gradually close the inlet (15).

8. The working method of the inlet rotary vane valve of the fuel pump according to claim 7, characterized in that During the closing process, the gas in the cavity on the side of the piston cavity (7) communicated with the braking cavity (9) is stretched, generating a suction force. The gas in the braking cavity (9) is sucked through the braking air passage (6), causing the brake (5) to move towards the bottom of the braking cavity (9), thereby separating the brake (5) from the rotating plate (11), and the braking force disappears, and the rotating plate (11) slides more easily.

9. The working method of the inlet rotary vane valve of the fuel pump according to claim 7, characterized in that, During the closing process, the gas in the cavity of the piston chamber (7) on the side communicating with the energy storage chamber (14) is compressed. The compressed gas floods into the energy storage chamber (14) through the sealed air passage (3), pushing the energy storage sealing ring (2) to move towards the swash plate (11), contacting and gradually pressing the swash plate (11), and increasing the compression amount of the energy storage sealing ring (2).

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