Adjustable pressure reducing valve structure of airplane wheel jack

Abstract

The utility model discloses an adjustable pressure reducing valve structure of an airplane wheel jack, which relates to the field of pressure reducing valves and comprises a hydraulic manifold block, a one-way valve is arranged at the bottom of the hydraulic manifold block and comprises a one-way hole arranged at the bottom of the hydraulic manifold block, and a one-way valve steel ball and a one-way valve seat are sequentially arranged in the one-way hole from top to bottom. An overflow valve is arranged on one side of the hydraulic integrated block and comprises an overflow hole formed in one side of the hydraulic integrated block, and an overflow valve steel ball, an overflow valve seat, an overflow valve spring and an overflow valve element are sequentially arranged in the overflow hole from inside to outside. Compared with an existing pressure reducing valve, the pressure reducing valve has the advantages that the space of the pressure reducing valve is effectively saved, good pressure reducing performance is guaranteed, the pressure difference between the pressure of a low-pressure hand pump and the pressure of a high-pressure hand pump is reliable, pressure reduction is achieved, and the pressure reducing valve is compact in structure, light in weight and small in size.

Description

Technical Field

[0001] This utility model relates to the field of machine wheel jacks, specifically to an adjustable pressure reducing valve structure for machine wheel jacks. Background Technology

[0002] Wheel jacks are used to lift aircraft when replacing the wheels of the nose landing gear or main landing gear, and the pressure relief valve is an important component of wheel jacks.

[0003] The existing pressure reducing valve structure of the wheel jack generally reduces pressure by changing the ratio of inlet and outlet pressures, adjusting the inlet and outlet pressures, etc. However, the current pressure reducing valve is difficult to save space effectively, and the valve is relatively large, which increases the volume and weight of the entire wheel jack, affecting its portability and installation in limited spaces. Utility Model Content

[0004] Therefore, the purpose of this utility model is to provide an adjustable pressure reducing valve structure for a wheel jack, so as to solve the technical problem of the large size of existing pressure reducing valves.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an adjustable pressure reducing valve structure for a wheel jack, comprising a hydraulic integrated block, a one-way valve disposed at the bottom of the hydraulic integrated block, the one-way valve comprising a one-way hole opened at the bottom of the hydraulic integrated block, the one-way hole comprising, from top to bottom, a one-way valve ball, a one-way valve seat, a one-way valve spring, a fastener, and a plug; an overflow valve disposed on one side of the hydraulic integrated block, the overflow valve comprising an overflow hole opened on one side of the hydraulic integrated block, the overflow hole comprising, from inside to outside, a one-way valve ball, a one-way valve seat, a one-way valve spring, a fastener, and a plug; and an overflow valve disposed on one side of the hydraulic integrated block, the overflow valve comprising, from inside to outside, an overflow hole comprising, the one-way valve ball, a one-way valve seat, a one-way valve spring, a fastener, and a plug. The hydraulic integrated block is equipped with an overflow valve ball, an overflow valve seat, an overflow valve spring, and an overflow valve core. A power reduction valve is provided on the other side of the hydraulic integrated block. The power reduction valve includes a power reduction valve core and a power reduction valve body located on the other side of the hydraulic integrated block. An installation port is also provided inside the hydraulic integrated block. A sealing plate is inserted into the installation port. The sealing plate has a first filter port and a second filter port. A first filter screen is installed inside the first filter port, and a second filter screen is installed inside the second filter port. A sealing plate is installed on the top of the sealing plate.

[0006] By adopting the above technical solution, the movement of the steel ball in the one-way valve can push the valve seat of the one-way valve to move, and cause the valve seat of the one-way valve to squeeze the spring of the one-way valve.

[0007] Furthermore, the power reduction valve body is provided with power reduction valve steel ball, power reduction valve seat, power reduction valve spring and adjusting rod from the inside to the outside.

[0008] By adopting the above technical solution, when the power reduction valve reaches the pressure value but the relief valve does not reach the pressure value, the hydraulic oil in the high-pressure oil inlet opens the power reduction valve core, causing the power reduction valve core to move to the left, and sequentially opens the power reduction valve ball and the power reduction valve seat.

[0009] Furthermore, the outer wall of the adjusting rod is provided with an adjusting rod O-ring seal.

[0010] By adopting the above technical solution, the O-ring on the adjusting rod can improve the sealing performance between the adjusting rod and the power reduction valve body.

[0011] Furthermore, the outer wall of the overflow valve core is provided with an overflow valve O-ring seal.

[0012] By adopting the above technical solution, the O-ring of the relief valve can improve the sealing performance between the relief valve core and the hydraulic manifold.

[0013] Furthermore, the two ends of the power reduction valve spring are respectively connected to the adjusting rod and the power reduction valve seat, and the power reduction valve ball is in contact with the power reduction valve seat.

[0014] By adopting the above technical solution, when the steel ball of the power reduction valve moves, it will push the power reduction valve seat to move, and cause the power reduction valve seat to squeeze the power reduction valve spring.

[0015] Furthermore, the two ends of the overflow valve spring are respectively connected to the overflow valve core and the overflow valve seat, and the overflow valve seat is in contact with the overflow valve steel ball.

[0016] By adopting the above technical solution, when the steel ball of the overflow valve moves, it will push the overflow valve seat to move, so that the overflow valve seat squeezes the overflow valve spring.

[0017] Furthermore, the hydraulic integrated block is also provided with a high-pressure oil inlet, which is connected to a one-way valve and is located behind the one-way valve seat.

[0018] By adopting the above technical solution, the high-pressure oil inlet hole is designed to facilitate the flow of hydraulic oil.

[0019] Furthermore, oil return holes are provided on both sides of the bottom of the hydraulic integrated block.

[0020] By adopting the above technical solution, the setting of the return oil hole facilitates the flow of hydraulic oil back to the oil tank.

[0021] Furthermore, a low-pressure oil inlet is provided at the middle position of the hydraulic integrated block.

[0022] By adopting the above technical solution, the low-pressure oil inlet hole is designed to facilitate the flow of hydraulic oil.

[0023] Furthermore, a locking bolt extending into the hydraulic integrated block is installed on the top of the sealing plate, the sealing plate is adapted to the mounting port, and multiple sealing gaskets are installed on the outer wall of the sealing plate. The first filter port corresponds to the low-pressure oil inlet, and the second filter port corresponds to the high-pressure oil inlet.

[0024] By adopting the above technical solution, the locking bolts can lock and limit the sealing plate and the sealing plate, while the setting of the sealing gasket can improve the sealing performance between the sealing plate and the installation port.

[0025] In summary, the present invention has the following main advantages:

[0026] 1. Compared with existing pressure reducing valves, this utility model effectively saves pressure reducing valve space and ensures good pressure reducing performance. It reliably reduces pressure by adjusting the pressure difference between the low-pressure hand-cranked pump pressure and the high-pressure hand-cranked pump pressure. Moreover, it has a compact structure, light weight and small size, which can reduce the volume and weight of the entire wheel jack and improve portability.

[0027] 2. This utility model, by setting a sealing plate, a first filter port, a first filter screen, a second filter port, and a second filter screen, allows hydraulic oil to enter the low-pressure inlet and then the first filter port, where the first filter screen filters the hydraulic oil. If the hydraulic oil enters the high-pressure inlet, it will enter the second filter port, where the second filter screen filters the hydraulic oil. This prevents impurities from entering the pressure reducing valve and causing blockage between the valve seat and the valve core, and avoids damage to components such as the valve core and spring.

[0028] 3. By providing a sealing gasket, this utility model can improve the sealing performance between the sealing plate and the installation port, prevent hydraulic oil leakage, and avoid hydraulic oil in the high-pressure oil inlet from flowing into the low-pressure oil inlet or vice versa.

[0029] 4. This utility model, by providing a sealing plate and locking bolts, allows for the cleaning of impurities attached to the first and second filter screens. When it is necessary to clean these impurities, the operator can rotate the locking bolts to unscrew them from the sealing plate and hydraulic integrated block. Then, the operator can pull the sealing plate to remove it from the installation port. This allows for the cleaning of impurities on the first and second filter screens, preventing impurities from accumulating on either screen. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model;

[0031] Figure 2 This is a side sectional view of the hydraulic integrated block of this utility model;

[0032] Figure 3 This is a schematic diagram of the power reduction valve body structure of this utility model;

[0033] Figure 4 This is a schematic diagram of the front section structure of the sealing plate of this utility model;

[0034] Figure 5 This is a three-dimensional structural diagram of the sealing plate of this utility model.

[0035] In the diagram: 1. Hydraulic integrated block; 2. Power reduction valve; 201. Power reduction valve body; 202. Adjusting rod O-ring seal; 203. Adjusting rod; 204. Power reduction valve spring; 205. Power reduction valve seat; 206. Power reduction valve ball; 207. Power reduction valve body O-ring seal; 208. Power reduction valve core; 209. Power reduction valve core O-ring seal; 3. Low-pressure oil inlet; 4. Relief valve; 401. Relief valve core; 402. Relief valve O-ring seal; 403. Relief valve spring; 404. Relief valve seat; 405. 1. Overflow valve ball; 406. Overflow hole; 5. Check valve; 501. Plug; 502. Fastener; 503. Check valve spring; 504. Check valve seat; 505. Check valve ball; 506. Check hole; 6. Oil return hole; 7. High pressure oil inlet; 8. Sealing plate; 9. Sealing plate; 10. Locking bolt; 11. Positioning block; 12. Positioning groove; 13. First filter port; 14. First filter screen; 15. Second filter port; 16. Second filter screen; 17. Sealing gasket; 18. Mounting port. Detailed Implementation

[0036] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0037] The embodiments of this utility model will be described below based on its overall structure.

[0038] Example 1:

[0039] An adjustable pressure reducing valve structure for a wheel jack, such as Figures 1-5As shown, the system includes a hydraulic integrated block 1. A one-way valve 5 is installed at the bottom of the hydraulic integrated block 1. The one-way valve 5 includes a one-way hole 506 opened at the bottom of the hydraulic integrated block 1. Inside the one-way hole 506, from top to bottom, are arranged a one-way valve ball 505, a one-way valve seat 504, a one-way valve spring 503, a fastener 502, and a plug 501. The two ends of the one-way valve spring 503 are respectively connected to the one-way valve seat 504 and the fastener 502. An overflow valve 4 is installed on one side of the hydraulic integrated block 1, and the overflow valve 4 includes an opening mechanism. An overflow hole 406 is provided on one side of the hydraulic integrated block 1. The overflow hole 406 is provided with an overflow valve ball 405, an overflow valve seat 404, an overflow valve spring 403 and an overflow valve core 401 arranged sequentially from the inside to the outside. A power reduction valve 2 is provided on the other side of the hydraulic integrated block 1. The power reduction valve 2 includes a power reduction valve core 208 and a power reduction valve body 201 located on the other side of the hydraulic integrated block 1. When the check valve ball 505 moves, it can push the check valve seat 504 to move and cause the check valve seat 504 to squeeze the check valve spring 503.

[0040] See Figures 1-4 The power reduction valve body 201 is arranged from the inside out with a power reduction valve ball 206, a power reduction valve seat 205, a power reduction valve spring 204, and an adjusting rod 203. When the power reduction valve 2 reaches the pressure value but the relief valve 4 does not, the hydraulic oil in the high-pressure oil inlet 7 pushes open the power reduction valve core 208 of the power reduction valve 2, causing the power reduction valve core 208 to move to the left, and then pushes open the power reduction valve ball 206 and the power reduction valve seat 205 in sequence. The two ends of the power reduction valve spring 204 are connected to the adjusting rod 203 and the power reduction valve seat 205 respectively. The power reduction valve ball 206 is in contact with the power reduction valve seat 205. When the power reduction valve ball 206 moves, it will push the power reduction valve seat 205 to move, and cause the power reduction valve seat 205 to squeeze the power reduction valve spring 204. The two ends of the overflow valve spring 403 are connected to the overflow valve core 401 and the overflow valve seat 404 respectively. The overflow valve seat 404 is in contact with the overflow valve ball 405. When the overflow valve ball 405 moves, it will push the overflow valve seat 404 to move, so that the overflow valve seat 404 squeezes the overflow valve spring 403.

[0041] Specifically, the hydraulic integrated block 1 is also provided with a high-pressure oil inlet 7, which is connected to the one-way hole 506. The high-pressure oil inlet 7 is located behind the one-way valve seat 504. The high-pressure oil inlet 7 is designed to facilitate the flow of hydraulic oil. The bottom sides of the hydraulic integrated block 1 are provided with return oil holes 6, which facilitate the flow of hydraulic oil back to the oil tank. The middle position of the hydraulic integrated block 1 is also provided with a low-pressure oil inlet 3, which facilitates the flow of hydraulic oil.

[0042] See Figures 1-5The hydraulic integrated block 1 also has an installation port 18 inside, into which a sealing plate 8 is inserted. The sealing plate 8 has a first filter port 13 and a second filter port 15 inside. A first filter screen 14 is installed inside the first filter port 13, and a second filter screen 16 is installed inside the second filter port 15. The arrangement of the first filter screen 14 and the second filter screen 16 allows for the filtration of hydraulic oil. A sealing plate 9 is installed on the top of the sealing plate 8, and a locking bolt 10 extending into the interior of the hydraulic integrated block 1 is installed on the top of the sealing plate 9. The sealing plate 8 is adapted to the mounting port 18. Multiple sealing gaskets 17 are installed on the outer wall of the sealing plate 8. The first filter port 13 corresponds to the low-pressure oil inlet 3, and the second filter port 15 corresponds to the high-pressure oil inlet 7. The locking bolt 10 can lock and limit the sealing plate 9 and the sealing plate 8. The setting of the sealing gaskets 17 can improve the sealing performance between the sealing plate 8 and the mounting port 18. The top of the hydraulic integrated block 1 also has two positioning grooves 12, and positioning blocks 11 are inserted into the inside of the positioning grooves 12. The top of the positioning blocks 11 is fixedly connected to the bottom of the sealing plate 9.

[0043] Example 2:

[0044] Based on the above embodiment 1, in order to improve the sealing between the adjusting rod 203 and the power reduction valve body 201, the following structure will be set.

[0045] Specifically, the outer wall of the adjusting rod 203 is provided with an adjusting rod O-ring seal 202, which can improve the sealing between the adjusting rod 203 and the power reduction valve body 201.

[0046] Example 3:

[0047] Based on the above embodiment 1, in order to improve the sealing performance between the overflow valve core 401 and the hydraulic integrated block 1, the following structure will be set.

[0048] See Figure 2 The outer wall of the overflow valve core 401 is provided with an overflow valve O-ring seal 402. The overflow valve O-ring seal 402 can improve the sealing between the overflow valve core 401 and the hydraulic integrated block 1 and prevent hydraulic oil leakage.

[0049] The working principle of this utility model is as follows: First, hydraulic oil flows in from the low-pressure inlet 3 and the high-pressure inlet 7 respectively. After the hydraulic oil enters the low-pressure inlet 3, it can enter the first filter port 13, where the first filter screen 14 filters the hydraulic oil. If the hydraulic oil enters the high-pressure inlet 7, it will enter the second filter port 15, where the second filter screen 16 filters the hydraulic oil, preventing impurities from entering the pressure reducing valve and causing blockage between the valve seat and the valve core. According to the usage requirements, the pressure value of the power reducing valve 2 is set, which can be adjusted by the adjusting rod 203. The pressure value of the relief valve 4 is also set, which can be adjusted by the relief valve core 401. When the power reducing valve 2 and the relief valve 4 do not reach the pressure value, the hydraulic oil flowing out of the low-pressure inlet 3 pressurizes the check valve ball of the check valve 5. 505, the hydraulic oil flowing from the high-pressure inlet 7 and the hydraulic oil flowing out of the high-pressure inlet 7 merge and flow into the P port of the reversing valve; when the power reduction valve 2 reaches the pressure value, but the relief valve 4 does not reach the pressure value, the pressure value of the hydraulic oil flowing out of the low-pressure inlet 3 should be less than the pressure value of the hydraulic oil flowing out of the high-pressure inlet 7. The hydraulic oil in the high-pressure inlet 7 pushes open the power reduction valve core 208 of the power reduction valve 2, causing the power reduction valve core 208 to move to the left, and then sequentially pushes open the power reduction valve steel. The hydraulic oil from the low-pressure inlet 3 enters the inner cavity of the reducing valve 2 through the internal oil passage of the hydraulic integrated block 1, and flows back to the oil tank from the return oil hole 6. The overflow valve 4 does not reach the pressure value. The hydraulic oil from the high-pressure inlet 7 pushes open the overflow valve ball 405 of the overflow valve 4, causing the overflow valve ball 405 to move to the right and push open the overflow valve seat 404. The hydraulic oil from the high-pressure inlet 7 flows back to the oil tank from the return oil hole 6 through the internal oil passage of the hydraulic integrated block 1.

[0050] When it is necessary to clean the impurities attached to the first filter screen 14 and the second filter screen 16, the operator can rotate the locking bolt 10 to unscrew the locking bolt 10 from the sealing plate 9 and the hydraulic integrated block 1. Then the operator can pull the sealing plate 9 to remove the sealing plate 8 from the installation port 18. After removing the sealing plate 8, the impurities on the first filter screen 14 and the second filter screen 16 can be cleaned.

[0051] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, and variations are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A machine wheel jack adjustable pressure relief valve structure comprising a hydraulic manifold block (1), characterized in that: The bottom of the hydraulic manifold (1) is provided with a one-way valve (5), the one-way valve (5) comprises a one-way hole (506) formed in the bottom of the hydraulic manifold (1), the inside of the one-way hole (506) is sequentially provided with a one-way valve steel ball (505), a one-way valve seat (504), a one-way valve spring (503), a tight nail (502) and a plug (501) from top to bottom, one side of the hydraulic manifold (1) is provided with an overflow valve (4), and the overflow valve (4) comprises an overflow hole (406) formed in one side of the hydraulic manifold (1), and the inside of the overflow hole (406) is sequentially provided with an overflow valve steel ball (405), an overflow valve seat (404), an overflow valve spring (403) and an overflow valve core (401) from inside to outside, the other side of the hydraulic manifold (1) is provided with a power reduction valve (2), the power reduction valve (2) comprises a power reduction valve core (208) and a power reduction valve body (201) arranged on the other side of the hydraulic manifold (1), the inside of the hydraulic manifold (1) is further formed with a mounting hole (18), the inside of the mounting hole (18) is inserted with a blocking plate (8), and the inside of the blocking plate (8) is formed with a first filter hole (13) and a second filter hole (15), the inside of the first filter hole (13) is provided with a first filter screen (14), the inside of the second filter hole (15) is provided with a second filter screen (16), and the top of the blocking plate (8) is provided with a sealing plate (9).

2. The adjustable pressure relief valve structure for a wheel jack according to claim 1, wherein: The power reduction valve body (201) is sequentially provided with a power reduction valve steel ball (206), a power reduction valve seat (205), a power reduction valve spring (204) and an adjusting rod (203) from inside to outside.

3. The adjustable pressure relief valve structure for a wheel jack according to claim 2, wherein: The outer wall of the adjusting rod (203) is provided with an adjusting rod O-shaped sealing ring (202).

4. The adjustable pressure relief valve structure for a wheel jack according to claim 1, wherein: The outer wall of the overflow valve core (401) is provided with an overflow valve O-shaped sealing ring (402).

5. The adjustable pressure relief valve structure for a wheel jack according to claim 2, wherein: The two ends of the power reduction valve spring (204) are connected with the adjusting rod (203) and the power reduction valve seat (205) respectively, and the power reduction valve steel ball (206) is attached to the power reduction valve seat (205).

6. The adjustable pressure relief valve structure for a wheel jack according to claim 1, wherein: The two ends of the overflow valve spring (403) are connected with the overflow valve core (401) and the overflow valve seat (404) respectively, and the overflow valve seat (404) is attached to the overflow valve steel ball (405).

7. The adjustable pressure relief valve structure for a wheel jack according to claim 1, wherein: The hydraulic manifold (1) is further provided with a high-pressure oil inlet hole (7), the high-pressure oil inlet hole (7) is communicated with the one-way hole (506), and the high-pressure oil inlet hole (7) is located behind the one-way valve seat (504).

8. The adjustable pressure relief valve structure for a wheel jack according to claim 1, wherein: Both sides of the bottom of the hydraulic manifold (1) are provided with an oil return hole (6).

9. The adjustable pressure relief valve structure for a wheel jack according to claim 7, wherein: The middle position of the hydraulic manifold (1) is further provided with a low-pressure oil inlet hole (3).

10. The adjustable pressure relief valve structure for a wheel jack according to claim 9, wherein: The top of the sealing plate (9) is provided with a locking bolt (10) extending into the inside of the hydraulic manifold (1), the blocking plate (8) is matched with the mounting hole (18), the outer wall of the blocking plate (8) is provided with a plurality of sealing gaskets (17), the first filter hole (13) corresponds to the low-pressure oil inlet hole (3), and the second filter hole (15) corresponds to the high-pressure oil inlet hole (7).

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