A low-power micro plunger oil pump for UAVs

Abstract

The present application relates to a low-power micro plunger oil pump for unmanned aerial vehicles, belonging to the technical field of unmanned aerial vehicles in the aviation industry. The low-power micro plunger oil pump for unmanned aerial vehicles comprises a housing, an oil-passing chamber and an oil chamber are provided in the housing, the oil-passing chamber and the oil chamber are connected, an oil inlet is provided on the housing, the oil inlet is connected to the oil-passing chamber through an oil delivery channel, a plunger is slidably provided in the oil-passing chamber, the sliding direction of the plunger is parallel to the length direction of the oil-passing chamber, the housing is provided with a driving member for driving the plunger to reciprocate, a first one-way valve is provided on the side of the plunger close to the oil chamber, the oil at the first one-way valve flows from the oil-passing chamber to the oil chamber, and an oil supply port for connecting to the power system of the unmanned aerial vehicle is provided at the oil chamber. The present application has the effect of improving the efficiency and working stability of the oil pump.

Description

Technical Field

[0001] The present application relates to the technical field of unmanned aerial vehicles (UAVs) in the aviation industry, and in particular to a low-power micro plunger oil pump for UAVs. Background Art

[0002] During the operation of the UAV, its engine needs to obtain continuous and stable oil. At present, gear oil pumps or vane oil pumps are mostly used in the field of UAV to provide oil for the power system.

[0003] However, in actual use, the vane oil pump has a low limit pressure, resulting in low efficiency; while the gear oil pump has a higher limit pressure, but there is cavitation, and cavitation is prone to damage the oil pump structure at high altitudes. Summary of the invention

[0004] In order to help improve the efficiency and working stability of the oil pump, the present application provides a low-power micro plunger oil pump for an unmanned aerial vehicle.

[0005] The present application provides a low-power micro plunger oil pump for UAVs using the following technical solutions: A low-power micro plunger oil pump for an unmanned aerial vehicle comprises a shell, wherein an oil passage chamber and an oil chamber are provided in the shell, the oil passage chamber and the oil chamber are communicated, an oil inlet is provided on the shell, the oil inlet is communicated with the oil passage chamber through an oil delivery channel, a plunger is slidably arranged in the oil passage chamber, the sliding direction of the plunger is parallel to the length direction of the oil passage chamber, the shell is provided with a driving member for driving the plunger to reciprocate, a first one-way valve is provided on the side of the plunger close to the oil chamber, the oil at the first one-way valve flows from the oil passage chamber to the oil chamber, and an oil supply port for connecting to a power system of the unmanned aerial vehicle is provided at the oil chamber.

[0006] Preferably, a second one-way valve is provided in the oil passage chamber, and the second one-way valve is located on a side of the first one-way valve close to the oil chamber, and the oil at the second one-way valve flows from the oil passage chamber to the oil chamber.

[0007] Preferably, the oil passage chamber includes a first chamber and a second chamber opened in the shell, the first chamber, the second chamber and the oil chamber are connected in sequence, the oil inlet is connected with the first chamber through an oil delivery channel, a plunger sleeve is provided in the second chamber, the plunger is slidably inserted in the plunger sleeve, an oil hole is opened on the plunger, one end of the oil hole is connected with the first chamber, and the other end is connected with the first one-way valve, and the second one-way valve is installed on the plunger sleeve.

[0008] Preferably, the cross-sectional area of ​​the first chamber is greater than the cross-sectional area of ​​the second chamber.

[0009] Preferably, an oil return chamber is provided in the shell, and the oil return chamber is located on a side of the oil chamber away from the oil passage chamber. A mold is provided between the oil return chamber and the oil chamber, and the mold separates the oil return chamber from the oil chamber. An oil passage hole is provided on the mold, and an overflow component for opening or closing the oil passage hole is provided on the mold. An oil return port is provided at the oil return chamber.

[0010] Preferably, the overflow assembly includes an overflow valve and an abutment member arranged in the oil return chamber, the mold is an elastic mold, the overflow valve is installed in the oil hole to block or open the oil hole, and the abutment member is used to abut the valve core of the overflow valve to open the oil hole.

[0011] Preferably, the abutment member comprises a pin disposed in the oil return chamber, the pin is aligned with the valve core of the relief valve and extends toward the mold piece, and the pin is used to abut the valve core of the relief valve to open the oil through hole.

[0012] Preferably, the driving member includes a driving motor mounted on the shell and an abutment wheel connected to the output shaft of the driving motor, the output shaft of the driving motor is rotatably passed through the shell, the abutment wheel is located in the shell, the output shaft of the driving motor is eccentrically connected to the abutment wheel, a connecting frame is provided at one end of the plunger away from the first one-way valve, the abutment wheel is located in the connecting frame, and opposite sides of the abutment wheel abut against opposite sides of the connecting frame.

[0013] Preferably, the driving motor is a brushless motor.

[0014] Preferably, the oil chamber and the brushless motor are located on the same side of the oil passage chamber.

[0015] In summary, this application includes the following beneficial technical effects: When in use, the oil enters the oil delivery channel from the oil inlet, and then enters the oil chamber from the oil delivery channel. The driving member drives the plunger to drive the first one-way valve to reciprocate. When the plunger drives the first one-way valve to move in a direction away from the oil chamber, the oil drives the first one-way valve to open, enters the oil chamber after passing through the first one-way valve, and then supplies oil to the power system of the drone through the oil supply port; when the plunger moves in a direction close to the oil chamber, work is done to increase the oil pressure, and negative pressure is generated to suck the oil into the oil chamber, and continuous oil supply is carried out through the reciprocating movement of the plunger. Since the linear speed of the plunger is lower than that of the gear oil pump and the vane oil pump, and the plunger has a long single stroke, a relatively large plunger diameter stroke, and high processing accuracy, it is not easy to cause internal leakage of the oil, so it is more efficient. At the same time, through the first one-way valve, it helps to ensure stable oil supply, make cavitation less likely to occur at high altitudes, improve the working stability of the oil pump, and the oil pump is not easy to be damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1It is a schematic diagram of the overall structure of Example 1 of the present application.

[0017] Figure 2 It is a cross-sectional view of the overall structure of Example 1 of the present application.

[0018] Figure 3 It is a cross-sectional view of the overall structure from another perspective of Example 1 of the present application, mainly used to show the position of the oil transfer channel.

[0019] Figure 4 This is a partial structural cross-sectional view of Example 1 of the present application.

[0020] Figure 5 It is a cross-sectional view of the overall structure of the oil return chamber in Example 1 of the present application.

[0021] Figure 6 It is a cross-sectional view of the overall structure of the oil return chamber in Example 2 of the present application.

[0022] Explanation of the reference numerals: 1. Shell; 2. Oil passage chamber; 21. First chamber; 22. Second chamber; 3. Oil chamber; 4. Oil inlet; 5. Oil delivery channel; 6. Plunger; 7. Driving member; 71. Driving motor; 72. Abutment wheel; 8. First one-way valve; 9. Oil supply port; 10. Second one-way valve; 11. Plunger sleeve; 12. Oil through hole; 13. Oil return chamber; 14. Mold; 15. Oil passage hole; 16. Oil return port; 17. Overflow valve; 18. Ejector pin; 19. Connecting frame; 20. Mounting chamber; 23. Boss; 24. Valve stem; 25. Valve plate; 26. Annular receiving groove; 27. Reset spring; 28. Limiting cylinder. DETAILED DESCRIPTION

[0023] The following combination Figure 1-Figure 6 This application is described in further detail.

[0024] Embodiment 1: The present application embodiment discloses a low-power micro plunger oil pump for a drone. Figure 1 and Figure 2 The low-power micro plunger oil pump for unmanned aerial vehicles includes a shell 1, in which an oil passage chamber 2 and an oil chamber 3 are provided, the oil passage chamber 2 and the oil chamber 3 are connected to each other, the length direction of the oil passage chamber 2 is arranged along the vertical direction, and the oil chamber 3 is located on the side of the oil passage chamber 2; specifically, the oil passage chamber 2 includes a first chamber 21 and a second chamber 22, the first chamber 21 is located below the second chamber 22, and the first chamber 21, the second chamber 22 and the oil chamber 3 are connected in sequence.

[0025] Reference Figure 2 and Figure 3The housing 1 is provided with an oil inlet 4, which is connected to the first chamber 21 through an oil delivery channel 5, so that the oil flows sequentially from the oil inlet 4, the oil delivery channel 5, the first chamber 21, the second chamber 22 and the oil chamber 3. A one-way valve is installed in the oil delivery channel 5 to ensure stable input of the oil.

[0026] Reference Figure 2 and Figure 4 The cross sections of the first chamber 21 and the second chamber 22 are both circular, and the diameter of the first chamber 21 is larger than the diameter of the second chamber 22, so that the cross-sectional area of ​​the first chamber 21 is larger than the cross-sectional area of ​​the second chamber 22, so as to increase the pressure of the oil. A plunger sleeve 11 is fixed in the second chamber 22, and a plunger 6 is slidably penetrated in the plunger sleeve 11. The sliding direction of the plunger 6 is parallel to the arrangement direction of the first chamber 21 and the second chamber 22, that is, the sliding direction of the plunger 6 is parallel to the length direction of the oil chamber 2. A driving member 7 for driving the plunger 6 to reciprocate is provided on the housing 1; a first one-way valve 8 is fixedly installed on the side of the plunger 6 close to the second chamber 22, and the oil at the first one-way valve 8 can only flow from the first chamber 21 to the second chamber 22. An oil hole 12 is opened at the center of the plunger 6, one end of the oil hole 12 is connected to the first chamber 21, and the other end is connected to the first one-way valve 8. An oil supply port 9 for connecting to the UAV power system is opened at the oil chamber 3.

[0027] When in use, the oil enters the oil delivery channel 5 from the oil inlet 4, and then enters the first chamber 21 of the oil chamber 2 through the oil delivery channel 5. The driving member 7 drives the plunger 6 to drive the first one-way valve 8 to move up and down. When the plunger 6 drives the first one-way valve 8 to move downward, that is, to move in a direction away from the oil chamber 3, the oil drives the first one-way valve 8 to open through the oil hole 12. The oil enters the oil chamber 3 after passing through the first one-way valve 8, and then supplies oil to the power system of the drone through the oil supply port 9. When the plunger 6 moves upward, that is, toward the direction close to the oil chamber 3, it performs work. The oil pressure is increased, and negative pressure is generated to suck the oil into the first chamber 21, and the reciprocating motion of the plunger 6 is used to stably supply oil. Since the linear velocity of the plunger 6 is lower than that of the gear oil pump and the vane oil pump, and the plunger 6 has a long single stroke, a relatively large diameter stroke, and a high processing accuracy, it is not easy to cause internal leakage of the oil, so it is more efficient and has low heat generation. At the same time, the first one-way valve 8 helps to ensure stable oil supply, making it less likely for the oil pump to have cavitation at high altitudes, thereby improving the working stability of the oil pump and making it less likely to be damaged.

[0028] In the present application, on the one hand, the plunger 6 is connected to the first one-way valve 8, which helps to save space. On the other hand, all the oil pipelines are arranged in the housing 1 without external pipelines, further reducing the overall dimensions of the oil pump, so that the maximum overall dimensions are only 55mm*70mm*33mm, which meets the requirements for use on drones.

[0029] Reference Figure 2 and Figure 4 In order to facilitate the reciprocating movement of the plunger 6, an installation chamber 20 is opened in the housing 1. The installation chamber 20 is located below the first chamber 21 and is connected to the first chamber 21. The driving member 7 includes a driving motor 71 and an abutment wheel 72. The driving motor 71 is fixedly mounted on the outer wall of the housing 1 by bolts or screws. The driving motor 71 and the oil chamber 3 are located on the same side of the first chamber 21, thereby further reducing the lateral size of the oil pump. The output shaft of the drive motor 71 is rotatably installed on the shell 1 and extends into the installation chamber 20. The abutment wheel 72 is connected to the output shaft of the drive motor 71. The abutment wheel 72 is located below the plunger 6 in the installation chamber 20. The output shaft of the drive motor 71 is eccentrically connected to the abutment wheel 72, that is, the output shaft of the drive motor 71 is connected to the non-center position of the abutment wheel 72. The end of the plunger 6 away from the first one-way valve 8 is connected to the connecting frame 19 through a support rod. The connecting frame 19 is slidably arranged in the installation chamber 20. The sliding direction of the connecting frame 19 is parallel to the sliding direction of the plunger 6. The abutment wheel 72 is located in the connecting frame 19, and the opposite sides of the abutment wheel 72 abut against the opposite sides of the connecting frame 19 in the sliding direction.

[0030] When it is necessary to drive the plunger 6 to slide, the drive motor 71 is started, and the drive motor 71 drives the abutment wheel 72 to rotate continuously. Since the diameter of the abutment wheel 72 is adapted to the inner length of the connecting frame 19 in its own sliding direction, during the rotation of the abutment wheel 72, the outer walls on both sides thereof will drive the connecting frame 19 to move, thereby realizing the reciprocating movement of the plunger 6 driven by the connecting frame 19.

[0031] Reference Figure 2 To facilitate internal processing, the installation chamber 20 passes through the side of the shell 1 away from the oil chamber 2. When the oil pump is installed, the opening of the shell 1 close to the installation chamber 20 needs to be closed to prevent oil leakage.

[0032] Reference Figure 2 The driving motor 71 is a brushless motor. A low-speed brushless motor can generate a larger torque under the same power to push the plunger 6 to reciprocate, thereby achieving low power consumption and high efficiency. It can reach a rated power of 2.5W and a maximum power of 5W, which is suitable for small drones.

[0033] Reference Figure 2 and Figure 4A second one-way valve 10 is fixedly installed in the plunger sleeve 11. The second one-way valve 10 is located at one end of the first one-way valve 8 close to the oil chamber 3. The oil at the second one-way valve 10 can only flow from the first chamber 21 to the second chamber 22. When the plunger 6 drives the first one-way valve 8 to move downward, the first one-way valve 8 is opened by the oil pressure, and the second one-way valve 10 is closed; when the plunger 6 drives the first one-way valve 8 upward, the first one-way valve 8 is closed, and the oil squeezes the second one-way valve 10 to open, so that the first one-way valve 8 and the second one-way valve 10 are always one open and one closed, which helps to ensure timely sealing during high-speed operation, further improve the working stability of the oil pump, and make the oil pump less likely to be damaged.

[0034] Reference Figure 2 and Figure 5 An oil return chamber 13 is provided in the housing 1. The oil return chamber 13 is located on a side of the oil chamber 3 away from the second chamber 22. A die 14 is fixed between the oil return chamber 13 and the oil chamber 3. The die 14 separates the oil return chamber 13 from the oil chamber 3. A boss 23 is integrally formed at the center of one side of the die 14 close to the oil return chamber 13. An oil through hole 15 is provided on the die 14 and the boss 23. The oil through hole 15 is located at the center of the die 14. An overflow component for opening or closing the oil through hole 15 is provided on the die 14. An oil return port 16 is provided at the oil return chamber 13. The oil return port 16 is used to communicate with the oil return tank.

[0035] Reference Figure 5 In order to facilitate opening or closing the oil hole 15, the mold 14 is an elastic mold 14 that can be deformed under the action of oil pressure; the overflow assembly includes an overflow valve 17 and an abutment member, the overflow valve 17 is fixedly installed in the oil hole 15, the valve core of the overflow valve 17 slides to block or open the oil hole 15, and the abutment member is arranged in the oil return chamber 13, and the abutment member is used to abut the valve core of the overflow valve 17 to open the oil hole 15. The specific structure of the overflow valve 17 is the existing technology and will not be described in detail here.

[0036] Reference Figure 2 and Figure 5 In order to facilitate the abutment against the valve core of the relief valve 17 to open the oil hole 15, the abutment member includes a ejector pin 18, which is fixedly arranged on the inner wall of the oil return chamber 13 on the side away from the oil chamber 3. The ejector pin 18 is aligned with the valve core of the relief valve 17 and extends toward the mold 14.

[0037] During the operation of the oil pump, the oil in the oil chamber 3 will squeeze the valve core of the relief valve 17, so that the valve core of the relief valve 17 blocks the oil hole 15; when the pressure in the oil chamber 3 increases, the oil will squeeze and drive the elastic mold 14 to deform in the direction of the oil return chamber 13. The elastic mold 14 has a pressure storage function, which helps to balance the pressure pulsation. As the mold 14 continues to deform toward the ejector pin 18, the ejector pin 18 abuts against the valve core of the relief valve 17, and the mold 14 continues to deform. Under the abutment of the ejector pin 18, the valve core of the relief valve 17 moves away from the mold 14, opening the oil hole 15. At this time, the oil in the oil chamber 3 will enter the oil return chamber 13, thereby releasing the excess pressure in the oil chamber 3, and the overflowed oil will flow into the oil return tank through the oil return port 16. When the pressure in the oil chamber 3 gradually decreases and recovers, the deformation of the mold 14 decreases, causing the valve core of the relief valve 17 to separate from the ejector pin 18. Under the action of the oil pressure in the oil chamber 3, the valve core continues to block the oil hole 15, which helps to ensure constant pressure and improve the working stability of the oil pump.

[0038] The implementation principle of Example 1 of the present application is as follows: when in use, the oil enters the oil delivery channel 5 from the oil inlet 4, and then enters the first chamber 21 from the oil delivery channel 5, and the brushless motor is started to drive the abutment wheel 72 to rotate continuously, and the abutment wheel 72 abuts the connecting frame 19 to drive the plunger 6 to move up and down; when the plunger 6 drives the first one-way valve 8 to move downward, the oil drives the first one-way valve 8 to open through the oil hole 12, and the second one-way valve 10 is closed under the action of negative pressure. After passing through the first one-way valve 8, the oil enters the plunger sleeve 11 between the first one-way valve 8 and the second one-way valve 10, and then the plunger 6 moves upward to do work to push the oil to drive the second one-way valve 10 to open, so that the first one-way valve 8 is closed, and negative pressure is generated to suck the oil into the first chamber 21, and the oil passes through the second one-way valve 10 and enters the oil chamber 3 to supply oil to the power system of the drone through the oil supply port 9.

[0039] The continuous and stable oil supply is achieved through the reciprocating motion of the plunger 6. Since the linear velocity of the plunger 6 is lower than that of the gear oil pump and the vane oil pump, and the plunger 6 has a long single stroke and a relatively large diameter stroke, the oil supply pressure is large and can continuously provide a pressure of 8 bar, where bar is a unit of pressure; the plunger 6 has high machining accuracy, is not prone to internal oil leakage, has low heat generation, and is therefore more efficient. In addition, the cooperation of the first one-way valve 8 and the second one-way valve 10 helps ensure stable oil supply, making it less likely for the oil pump to have cavitation at high altitudes, improving the working stability of the oil pump, and making it less likely for the oil pump to be damaged.

[0040] When the plunger 6 moves upward, the pressure in the oil chamber 3 increases, and the pressure is accumulated through the deformation of the mold 14 to achieve the effect of balancing the pressure pulsation. As the pressure in the oil chamber 3 continues to increase, the oil will squeeze and drive the elastic mold 14 to deform in the direction of the oil return chamber 13, and then the ejector pin 18 will abut against the valve core of the relief valve 17, and the mold 14 will continue to deform. Under the abutment of the ejector pin 18, the valve core of the relief valve 17 opens the oil hole 15. At this time, the oil in the oil chamber 3 will enter the oil return chamber 13, so that the excess pressure in the oil chamber 3 is released, and the overflowed oil flows into the oil return tank through the oil return port 16; when the pressure in the oil chamber 3 gradually recovers, the deformation of the mold 14 decreases, so that the valve core of the relief valve 17 is separated from the ejector pin 18. Under the action of the oil pressure in the oil chamber 3, the valve core of the relief valve 17 continues to block the oil hole 15, which helps to ensure constant pressure and further improve the working stability of the oil pump.

[0041] Embodiment 2: Reference Figure 5 and Figure 6 The difference between the embodiment of the present application and the embodiment 1 is that the overflow valve 17 is replaced by a valve stem 24 that is slidably disposed in the oil hole 15, the sliding direction of the valve stem 24 is parallel to the length direction of the ejector pin 18, and the valve stem 24 cooperates with the ejector pin 18 to block or open the oil hole 15. Specifically, the diameter of the oil hole 15 decreases in the direction close to the oil return chamber 13, and the diameter of the valve stem 24 also decreases in the direction close to the oil return chamber 13, so that as long as the valve stem 24 moves a small distance in the direction relatively away from the die 14, the oil can enter the oil return chamber 13 through the oil hole 15.

[0042] Reference Figure 6 The end of the valve stem 24 away from the oil return chamber 13 is fixedly connected to a valve plate 25, and the valve plate 25 is used to abut against a side of the mold 14 away from the oil return chamber 13. Under the oil pressure of the oil chamber 3, the valve plate 25 is tightly abutted against the mold 14 to block the oil hole 15.

[0043] Reference Figure 6 To further ensure the closure of the oil hole 15, an annular receiving groove 26 is provided on the side of the die 14 away from the oil return chamber 13. The inner diameter of the annular receiving groove 26 is greater than the maximum outer diameter of the oil hole 15. The annular receiving groove 26 is concentrically arranged with the oil hole 15. A return spring 27 is arranged in the annular receiving groove 26. The return spring 27 is used to pull the valve plate 25 and the die 14 closer to each other to close the oil hole 15. Specifically, the return spring 27 is movably sleeved on one end of the valve stem 24 away from the ejector pin 18. One end of the return spring 27 is fixed to the bottom wall of the annular receiving groove 26, and the other end is fixed to the valve plate 25.

[0044] Reference Figure 6A sealing ring (not marked in the figure) is bonded to the side of the valve plate 25 close to the die 14. The sealing ring is arranged along the circumference of the valve plate 25. The sealing ring is used to abut against the side of the die 14 away from the ejector pin 18. The return spring 27 is located inside the sealing ring. When in use, under the action of the oil pressure in the oil chamber 3, the valve plate 25 will tightly abut the sealing ring against the die 14, and at the same time can adapt to the deformation of the die 14, effectively improving the sealing effect of the valve stem 24.

[0045] Reference Figure 6 The end of the valve stem 24 close to the ejector pin 18 is fixed with a limiting cylinder 28, the outer diameter of which is smaller than the minimum diameter of the valve stem 24, and the ejector pin 18 is located in the limiting cylinder 28. At the same time, a plurality of arc-shaped protrusions can be integrally formed on the outer wall of the limiting cylinder 28, and the plurality of arc-shaped protrusions are located at the end of the limiting cylinder 28 close to the ejector pin 18, so as not to block the oil hole 15. The oil passing through the oil hole 15 can be buffered to a certain extent under the action of the plurality of arc-shaped protrusions.

[0046] The implementation principle of the second embodiment of the present application is as follows: during the operation of the oil pump, the oil in the oil chamber 3 will squeeze the valve plate 25, thereby ensuring that the oil hole 15 is in a closed state; when the pressure in the oil chamber 3 increases, the oil will squeeze and drive the elastic mold 14 to deform toward the oil return chamber 13, which helps to balance the pressure pulsation, and as the mold 14 continues to deform toward the ejector pin 18, the ejector pin 18 abuts against the end of the valve stem 24. Under the abutment of the ejector pin 18, the valve stem 24 and the mold 14 move relatively away from each other, opening the oil hole 15. At this time, the oil in the oil chamber 3 will enter the oil return chamber 13, thereby releasing the excess pressure in the oil chamber 3, and the overflowed oil will flow into the oil return tank through the oil return port 16. When the pressure in the oil chamber 3 gradually recovers, the deformation of the mold 14 decreases, causing the valve stem 24 to separate from the ejector pin 18. Under the action of the reset spring 27 and the oil pressure in the oil chamber 3, the valve stem 24 continues to block the oil hole 15, which helps to ensure constant pressure and improve the working stability of the oil pump.

[0047] By setting the limiting cylinder 28, no matter how the mold piece 14 is deformed, the ejector pin 18 is always aligned with the valve stem 24 and will not deviate from the valve stem 24; at the same time, the limiting cylinder 28 can also protect the ejector pin 18 so that the ejector pin 18 will not be deformed by the impact of oil during long-term use.

[0048] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A low-power micro plunger oil pump for UAV, characterized by: The invention comprises a shell (1), wherein an oil chamber (2) and an oil chamber (3) are provided in the shell (1), wherein the oil chamber (2) and the oil chamber (3) are connected, wherein an oil inlet (4) is provided on the shell (1), wherein the oil inlet (4) is connected to the oil chamber (2) via an oil delivery channel (5), wherein a plunger (6) is slidably provided in the oil chamber (2), wherein the sliding direction of the plunger (6) is parallel to the length direction of the oil chamber (2), wherein the shell (1) is provided with a driving member (7) for driving the plunger (6) to reciprocate, wherein a first one-way valve (8) is provided on a side of the plunger (6) close to the oil chamber (3), wherein the oil at the first one-way valve (8) flows from the oil chamber (2) to the oil chamber (3), and wherein an oil supply port (9) for connecting to a power system of an unmanned aerial vehicle is provided at the oil chamber (3).

2. A low-power micro plunger oil pump for an unmanned aerial vehicle according to claim 1, characterized in that: A second one-way valve (10) is arranged in the oil passage chamber (2). The second one-way valve (10) is located on a side of the first one-way valve (8) close to the oil chamber (3). The oil at the second one-way valve (10) flows from the oil passage chamber (2) to the oil chamber (3).

3. A low-power micro plunger oil pump for an unmanned aerial vehicle according to claim 2, characterized in that: The oil passage chamber (2) comprises a first chamber (21) and a second chamber (22) which are provided in the housing (1); the first chamber (21), the second chamber (22) and the oil chamber (3) are connected in sequence; the oil inlet (4) is connected to the first chamber (21) through an oil delivery passage (5); a plunger sleeve (11) is provided in the second chamber (22); the plunger (6) is slidably inserted into the plunger sleeve (11); an oil through hole (12) is provided on the plunger (6); one end of the oil through hole (12) is connected to the first chamber (21), and the other end is connected to the first one-way valve (8); the second one-way valve (10) is mounted on the plunger sleeve (11).

4. A low-power micro plunger oil pump for an unmanned aerial vehicle according to claim 3, characterized in that: The cross-sectional area of ​​the first chamber (21) is greater than the cross-sectional area of ​​the second chamber (22).

5. A low-power micro plunger oil pump for an unmanned aerial vehicle according to claim 1, characterized in that: An oil return chamber (13) is provided in the housing (1). The oil return chamber (13) is located on a side of the oil chamber (3) away from the oil passage chamber (2). A die (14) is provided between the oil return chamber (13) and the oil chamber (3). The die (14) separates the oil return chamber (13) from the oil chamber (3). An oil passage hole (15) is provided on the die (14). An overflow component for opening or closing the oil passage hole (15) is provided on the die (14). An oil return port (16) is provided at the oil return chamber (13).

6. A low-power micro plunger oil pump for an unmanned aerial vehicle according to claim 5, characterized in that: The overflow assembly comprises an overflow valve (17) and an abutment member arranged in the oil return chamber (13); the die (14) is an elastic die (14); the overflow valve (17) is installed in the oil passage hole (15) to block or open the oil passage hole (15); and the abutment member is used to abut against a valve core of the overflow valve (17) to open the oil passage hole (15).

7. A low-power micro plunger oil pump for an unmanned aerial vehicle according to claim 6, characterized in that: The abutment member comprises a pin (18) arranged in the oil return chamber (13); the pin (18) is aligned with the valve core of the overflow valve (17) and extends toward the mold piece (14); the pin (18) is used to abut the valve core of the overflow valve (17) to open the oil passage hole (15).

8. A low-power micro plunger oil pump for an unmanned aerial vehicle according to any one of claims 1 to 7, characterized in that: The driving member (7) comprises a driving motor (71) mounted on a housing (1) and an abutment wheel (72) connected to an output shaft of the driving motor (71); the output shaft of the driving motor (71) is rotatably arranged on the housing (1); the abutment wheel (72) is located in the housing (1); the output shaft of the driving motor (71) is eccentrically connected to the abutment wheel (72); a connecting frame (19) is provided at one end of the plunger (6) away from the first one-way valve (8); the abutment wheel (72) is located in the connecting frame (19); and opposite sides of the abutment wheel (72) abut against opposite sides of the connecting frame (19).

9. A low-power micro plunger oil pump for an unmanned aerial vehicle according to claim 8, characterized in that: The driving motor (71) is a brushless motor.

10. A low-power micro plunger oil pump for an unmanned aerial vehicle according to claim 8, characterized in that: The oil chamber (3) and the brushless motor are located on the same side of the oil passage chamber (2).

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