A lightweight piezoelectric hydraulic pump suitable for long-duration operation

Abstract

The present invention discloses a lightweight piezoelectric hydraulic pump suitable for long-term operation, which includes a pump body, a connection groove is arranged in the pump body, the lower part of the connection groove is connected to the cavity, the pump body is connected to the fixing part through the connection groove, and the fixing part is provided with an oil inlet pipeline and an oil outlet pipeline; a ceramic tube is arranged in the cavity, and the lower end of the ceramic tube is connected to the electrode; the upper end of the ceramic tube is connected to the driving block, the upper end of the driving block is in contact with the fixing part, a working chamber is arranged between the upper end face of the driving block and the lower end face of the fixing part, a separation hole connected to the ceramic tube is opened on the driving block, and a one-way valve sheet is respectively installed on one side of the driving block adjacent to the fixing part and on the side of the fixing part deviating from the driving block. The present invention can solve the problem that the valveless driver in the prior art is difficult to work for a long time, and has a compact structure, light weight, large output performance, and high energy density.

Description

Technical Field

[0001] The present invention relates to the technical field of piezoelectric hydraulics, and in particular to a lightweight piezoelectric hydraulic pump suitable for long-term operation. Background Art

[0002] The rapid development of piezoelectric smart materials has opened new avenues for the design and development of small, high-performance piezoelectric pumps. Piezoelectric ceramic-based actuators work by filling a designed pump cavity with fluid. Applying electricity causes the fluid to circulate, generating pressure and flow output, which is ultimately converted into a driving force to achieve the desired effect. Due to their compact size, high energy efficiency, and high reliability, they hold broad application prospects in aerospace, mechanical engineering, precision medicine, and other fields.

[0003] Actuators can be divided into two categories based on whether they have valves: valved and valveless. Compared to valved actuators of the same size, valveless actuators perform better in high-pressure, high-viscosity media. However, they have disadvantages such as low flow rate, low back pressure, low efficiency, difficulty in long-term operation, and poor reverse flow control. Summary of the Invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention provides a lightweight piezoelectric hydraulic pump suitable for long-term operation, which can solve the problem that valveless drivers in the prior art are difficult to operate for a long time.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A lightweight piezoelectric hydraulic pump suitable for long-term operation is provided, which includes a pump body, a connecting groove is provided in the pump body, the lower part of the connecting groove is connected to the cavity, the pump body is connected to the fixing part through the connecting groove, and the fixing part is provided with an oil inlet pipeline and an oil outlet pipeline; a ceramic tube is provided in the cavity, and the lower end of the ceramic tube is connected to the electrode; the upper end of the ceramic tube is connected to the driving block, the upper end of the driving block abuts against the fixing part, and a working chamber is provided between the upper end surface of the driving block and the lower end surface of the fixing part, a separation hole connected to the ceramic tube is provided on the driving block, and a one-way valve plate is respectively installed on a side of the driving block adjacent to the fixing part and a side of the fixing part deviating from the driving block, the one-way valve plate is a variable thickness valve plate, the middle part of the one-way valve plate is thicker than the edge, and the side of the one-way valve plate adjacent to the driving block is flat;

[0007] The lower part of the cavity is fixedly connected to the lower cover, and a side hole is provided on the lower cover for connecting to the oil inlet pipeline. The electrode passes through the lower cover and is electrically connected to the ceramic tube; the fixing part includes an upper cover, and the upper cover is provided with an oil inlet hole for matching with the oil inlet pipeline and an oil outlet hole for matching with the oil outlet pipeline.

[0008] The main beneficial effects of the lightweight piezoelectric hydraulic pump suitable for long-term operation provided by the present invention are:

[0009] The present invention uses an oil inlet pipeline, a side hole, a ceramic tube, an oil outlet channel and an oil outlet pipeline to work together as a hydraulic circulation system, and uses an electrode, a ceramic tube, a drive block and a one-way valve plate to work together as a piezoelectric ceramic drive system. By integrating the hydraulic circulation system and the piezoelectric ceramic drive system in an overall sealed cavity structure, high-frequency drive is jointly achieved.

[0010] The piezoelectric effect of the electrode causes the ceramic tube to deform, driving the drive block to squeeze the working chamber. The one-way valve on the drive block closes and the one-way valve on the fixed part opens, causing the fluid in the working chamber to be discharged from the oil outlet pipeline under pressure; when the drive block expands the working chamber, the one-way valve on the drive block opens and the one-way valve on the fixed part closes. Under the action of the pressure difference, the fluid in the oil inlet pipeline enters the working chamber along the side holes, the ceramic tube and the oil outlet channel, realizing the oil supply operation; through the repeated squeezing and expansion movements of the drive block, the high-frequency driving operation of the hydraulic pump is realized.

[0011] By aligning the operating position of the one-way valve disc with the fluid's circulation trajectory, the piezoelectric ceramic drive system effectively maintains heat dissipation, enabling long-term operation and making the entire piezoelectric pump safer and more efficient. Because the drive block abuts against the fixed component, its extrusion and expansion are limited, and deformation time is short, enabling high-frequency and high-efficiency operation. The one-way valve disc, ceramic tube, and oil outlet pipeline work together to utilize hydraulic transmission to achieve high driving force. It also offers advantages such as compact structure, light weight, high output performance, and high energy density. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural diagram of this scheme.

[0013] Figure 2 This is a schematic diagram of the appearance of a hydraulic pump.

[0014] Figure 3 It is a bottom view of the one-way valve disc.

[0015] Among them, 1. pump body, 11. connecting groove, 12. cavity, 2. fixing part, 21. oil inlet pipeline, 22. oil outlet pipeline, 23. upper cover, 24. oil inlet hole, 25. oil outlet hole, 26. ring groove, 3. drag reduction block, 31. upper oil hole, 32. oil outlet cavity, 4. receiving block, 41. oil drain hole, 42. middle oil hole, 43. sealing ring, 5. connecting sleeve, 51. lower oil hole, 52. working chamber, 6. driving block, 61. separation hole, 7. ceramic tube, 71. oil delivery channel, 8. lower cover, 81. abutting ring, 82. side hole, 83. electrode, 84. wire, 9. one-way valve plate, 91. upper valve plate, 92. lower valve plate, 93. elastic plate. DETAILED DESCRIPTION

[0016] The present invention will be further described below in conjunction with the accompanying drawings:

[0017] like Figure 1 As shown, it is a structural schematic diagram of a lightweight piezoelectric hydraulic pump suitable for long-term operation.

[0018] The lightweight piezoelectric hydraulic pump suitable for long-term operation of the present invention includes a pump body 1, a connecting groove 11 is provided in the pump body 1, the lower part of the connecting groove 11 is connected to the cavity 12, and the pump body 1 is connected to the fixed part 2 through the connecting groove 11. The fixed part 2 is provided with an oil inlet pipeline 21 and an oil outlet pipeline 22; a ceramic tube 7 is provided in the cavity 12, and the lower end of the ceramic tube 7 is connected to the electrode 83; the upper end of the ceramic tube 7 is connected to the driving block 6, and the upper end of the driving block 6 is in contact with the fixed part 2. A working chamber 52 is provided between the upper end surface of the driving block 6 and the lower end surface of the fixed part 2. A separation hole 61 is provided on the driving block 6 and is connected to the ceramic tube 7. The fluid enters the working chamber 52 from the ceramic tube 7 along the separation hole 61. A one-way valve plate 9 is respectively installed on the side of the driving block 6 adjacent to the fixed part 2 and on the side of the fixed part 2 that deviates from the driving block 6.

[0019] Preferably, the ceramic tube 7 is made of piezoelectric ceramic material so that it can deform by utilizing the piezoelectric effect when energized, thereby squeezing the driving block 6 and driving the hydraulic pump to work.

[0020] The lower portion of the cavity 12 is fixedly connected to the lower cover 8. The lower cover 8 has a side hole 82 that is connected to the oil inlet line 21. The electrode 83 passes through the lower cover 8 and is electrically connected to the ceramic tube 7. The fixing member 2 includes an upper cover 23, which has an oil inlet hole 24 that cooperates with the oil inlet line 21 and an oil outlet hole 25 that cooperates with the oil outlet line 22.

[0021] Specifically, the oil inlet line 21 includes an oil inlet passage between the driver block 6 and the cavity 12, and between the ceramic tube 7 and the cavity 12. The side hole 82 is provided at the end of the oil inlet passage. The driver block 6 and the ceramic tube 7 have the same outer diameter, so the annular gap between the driver block 6, the ceramic tube 7, and the cavity 12 together forms the oil inlet passage. This ensures that fluid flows along the oil inlet passage to the side hole 82, cooling the ceramic tube 7 under the action of the electrode 83.

[0022] The fixing member 2 comprises, from top to bottom, an upper cover 23, a drag reduction block 3, a receiving block 4, and a connecting sleeve 5, which abut against each other in sequence. The outer side of the lower end of the connecting sleeve 5 abuts the connecting groove 11, while the inner side of the lower end of the connecting sleeve 5 abuts the underside of the driver block 6. The space inside the connecting sleeve 5 between the receiving block 4 and the driver block 6 constitutes the working chamber 52. The ceramic tube 7 drives the driver block 6 to squeeze or expand the working chamber 52, achieving the circulation of the hydraulic pump.

[0023] The one-way valve disc 9 includes an upper valve disc 91 disposed on the upper surface of the receiving block 4 and a lower valve disc 92 disposed on the upper surface of the driving block 6. An oil outlet cavity 32 is formed on one side of the drag reduction block 3 adjacent to the upper valve disc 91. The oil outlet cavity 32 is provided to provide space for the upper valve disc 91 to move.

[0024] An oil drain hole 41 opposite to the upper valve plate 91 is provided on the receiving block 4. One end of the separation hole 61 is a single hole connected to the inner side of the ceramic tube 7, and the other end is a plurality of small holes connected to the working chamber 52 and evenly distributed relative to the upper surface of the driving block 6. The oil outlet pipeline 22 includes an oil outlet hole 25, an oil outlet chamber 32, an oil drain hole 41, a connecting sleeve 5, a separation hole 61 and a ceramic tube 7 that are connected through each other.

[0025] Several upper oil holes 31 are provided on the edge of the drag reduction block 3, a middle oil hole 42 corresponding to the upper oil hole 31 is provided on the receiving block 4, and a lower oil hole 51 corresponding to the middle oil hole 42 is provided on the connecting sleeve 5. The oil inlet pipeline 21 includes an oil inlet hole 24, an upper oil hole 31, a middle oil hole 42, a lower oil hole 51 and an oil delivery channel 71 that are connected through each other.

[0026] Preferably, sealing rings 43 are respectively provided on the interface between the upper end of the drag reduction block 3 and the upper cover 23 , the interface between the upper end of the receiving block 4 and the drag reduction block 3 , and the interface between the upper end of the connecting sleeve 5 and the receiving block 4 to ensure the sealing of the oil inlet pipeline 21 .

[0027] An annular groove 26 is formed in the lower portion of the upper cover 23, adjacent to the drag reduction block 3. The annular groove 26 is connected to each upper oil hole 31, and the annular groove 26 is connected to the oil inlet hole 24. By providing the annular groove 26, the fluid entering the oil inlet hole 24 is dispersed and injected into each upper oil hole 31, thereby achieving fluid circulation in the oil inlet pipeline 21.

[0028] The upper portion of the lower cover 8 is provided with an abutment ring 81 that mates with the ceramic tube 7. A side hole 82 is provided on the side of the abutment ring 81. The electrode 83 extends through the abutment ring 81 and is electrically connected to the ceramic tube 7. The end of the electrode 83 is connected to an external wire 84. When electricity is applied to the ceramic tube 7 through the electrode 83, the piezoelectric effect causes the ceramic tube 7 to deform, thereby squeezing the drive block 6 and, through pressure transmission, squeezing the working chamber 52. When the electricity is applied, the inverse piezoelectric effect causes the ceramic tube 7 to return to its original shape, causing the drive block 6 to return to its original shape, thereby expanding the squeezed working chamber 52.

[0029] The one-way valve disc 9 has a snowflake-like structure. Its center is fixed and connected to several elastic discs 93. These discs are shaped to match the oil drain hole 41 and the separation hole 61. Because one side of the one-way valve disc 9 abuts the drive block 6 and the receiving block 4, it cannot deform or move in the direction of the abutment surface. Instead, it can only deform and move away from the abutment surface under the action of the fluid flowing through the oil drain hole 41 and the separation hole 61, thereby achieving one-way conduction.

[0030] Preferably, the elastic piece 93 is circular to match the shapes of the oil drain hole 41 and the separation hole 61 .

[0031] Preferably, the one-way valve disc 9 is a variable thickness valve disc, the thickness of the middle part of the one-way valve disc 9 is greater than the thickness of the elastic disc 93, and the side of the one-way valve disc 9 adjacent to the abutting surface is flat to increase its service life.

[0032] The following is an explanation of the working principle of the lightweight piezoelectric hydraulic pump provided by this solution:

[0033] S1. During the oil discharge process, a high-frequency sinusoidal positive voltage is applied to the ceramic tube 7 through the wire 84 and the electrode 83. Due to the inverse piezoelectric effect of the piezoelectric ceramic material, the ceramic tube 7 is deformed. The deformation is transmitted to the working chamber 52 through the driving block 6, squeezing the fluid in the working chamber 52. The pressure of the fluid in the chamber increases, causing the lower valve plate 92 to close. Since it cannot deform toward the ceramic tube 7, the fluid cannot flow into the separation hole 61, thereby achieving a unidirectional conduction effect; at this time, after passing through the working chamber 52 and the oil drain hole 41, the fluid reaches the position of the upper valve plate 91, the upper valve plate 91 opens, and the fluid passes through the oil outlet chamber 32 and finally flows out from the oil outlet hole 25.

[0034] S2. When the amplitude of the applied high-frequency sinusoidal positive voltage begins to decrease, the deformation of the ceramic tube 7 begins to recover, the drive block 6 retreats, causing the pressure in the working chamber 52 to decrease, the upper valve plate 91 is closed, and the liquid flows from the oil inlet hole 24 through the annular groove 26 through the upper oil hole 31, the middle oil hole 42 and the lower oil hole 51 in sequence, and then through the oil delivery channel 71, the side hole 82, the ceramic tube 7, the separation hole 61 and the lower valve plate 92, and flows into the working chamber 52, completing the oil inlet operation.

[0035] S3. Repeat steps S1 and S2 according to the set frequency, so as to achieve continuous operation of the hydraulic pump.

[0036] The continuous inflow and outflow of the fluid enables the hydraulic circulation system to operate continuously, and at the same time, the electrode 83, the ceramic tube 7, the drive block 6 and the one-way valve plate 9 can be cooled to ensure their continuous working capability.

[0037] The above describes the specific embodiments of the present invention to facilitate understanding of the present invention by those skilled in the art. However, it should be clear that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concepts of the present invention are protected.

Claims

1. A lightweight piezoelectric hydraulic pump suitable for long-term operation, characterized in that: It comprises a pump body, a connecting groove is arranged in the pump body, the lower part of the connecting groove is connected with the cavity body, the pump body is connected with the fixing part through the connecting groove, and the fixing part is provided with an oil inlet pipeline and an oil outlet pipeline; a ceramic tube is arranged in the cavity, and the lower end of the ceramic tube is connected with the electrode; the upper end of the ceramic tube is connected with the driving block, and the upper end of the driving block is abutted with the fixing part, and a working chamber is arranged between the upper end surface of the driving block and the lower end surface of the fixing part, and a separation hole connected with the ceramic tube is opened on the driving block, and a one-way valve plate is respectively installed on one side of the driving block adjacent to the fixing part and on the side of the fixing part deviating from the driving block, and the one-way valve plate is a variable thickness valve plate, the middle part of the one-way valve plate is thicker than the edge, and the side of the one-way valve plate adjacent to the driving block is a plane; The lower part of the cavity is fixedly connected to the lower cover, and a side hole connected to the oil inlet pipeline is opened on the lower cover, and the electrode passes through the lower cover and is electrically connected to the ceramic tube; the fixing member includes an upper cover, and an oil inlet hole matched with the oil inlet pipeline and an oil outlet hole matched with the oil outlet pipeline are opened on the upper cover; The oil inlet pipeline includes an oil inlet passage between the driving block and the cavity, and between the ceramic tube and the cavity, and the side hole is arranged at the end of the oil inlet passage; The upper part of the lower cover is provided with an abutting ring matched with the ceramic tube, the side hole is opened on the side surface of the abutting ring, and the electrode passes through the abutting ring and is electrically connected with the ceramic tube.

2. The lightweight piezoelectric hydraulic pump suitable for long-term operation according to claim 1, characterized in that: The fixing member comprises a connecting sleeve, the outer side of the lower end of the connecting sleeve abuts against the connecting groove, and the inner side of the lower end of the connecting sleeve abuts against the lower side surface of the driving block.

3. The lightweight piezoelectric hydraulic pump suitable for long-term operation according to claim 2, characterized in that: The fixing member comprises a receiving block, the lower end of which is in contact with the connecting sleeve; the one-way valve plate comprises an upper valve plate arranged on the upper surface of the receiving block and a lower valve plate arranged on the upper surface of the driving block.

4. The lightweight piezoelectric hydraulic pump suitable for long-term operation according to claim 3, characterized in that: The fixing member comprises a drag reduction block, the upper end surface of the drag reduction block is in contact with the upper cover, and an oil outlet cavity is provided on one side of the drag reduction block adjacent to the upper valve plate.

5. The lightweight piezoelectric hydraulic pump suitable for long-term operation according to claim 4, characterized in that: The receiving block is provided with an oil discharge hole opposite to the upper valve plate, and the oil outlet pipeline comprises an oil outlet hole, an oil outlet cavity, an oil discharge hole, a connecting sleeve, a separation hole and a ceramic tube which are connected through each other.

6. The lightweight piezoelectric hydraulic pump suitable for long-term operation according to claim 4, characterized in that: A plurality of upper oil holes are arranged on the edge of the drag reduction block, a middle oil hole corresponding to the upper oil hole is arranged on the receiving block, a lower oil hole corresponding to the middle oil hole is arranged on the connecting sleeve, and the oil inlet pipeline includes an oil inlet hole, an upper oil hole, a middle oil hole, a lower oil hole and an oil delivery channel which are connected through each other.

7. The lightweight piezoelectric hydraulic pump suitable for long-term operation according to claim 6, characterized in that: An annular groove is provided at the lower part of the upper cover adjacent to the drag reduction block, the annular groove is connected through each upper oil hole, and the annular groove is connected through the oil inlet hole.

8. The lightweight piezoelectric hydraulic pump suitable for long-term operation according to claim 6, characterized in that: The one-way valve plate is in a snowflake-shaped structure. The middle of the one-way valve plate is fixed and connected to a plurality of elastic plates. The elastic plates are in a sheet-shaped structure that matches the oil discharge hole and the separation hole.

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