Novel valveless piezoelectric fluid driving pump

Abstract

The utility model discloses a novel valveless piezoelectric fluid driving pump which comprises a pump body, a liquid inlet pipe is installed on the left side of the pump body, a liquid outlet pipe is installed on the right side of the pump body, a pump cavity is formed in the pump body, and the liquid inlet pipe and the liquid outlet pipe are both communicated with the pump cavity. The pump core assembly is mounted in the pump cavity and used for controlling the flow direction of fluid; the one-way flow pump is reasonable in structure, one-way flow of fluid is achieved through the fact that the pump cavity is matched with the pump body assembly to have different resistance to the fluid, one-way flow of the fluid can be achieved without valve control, and the one-way flow pump is simple in structure, convenient to use and high in practicability. The cost of the piezoelectric pump can be effectively reduced, and the use requirements can be better met.

Description

Technical Field

[0001] The utility model relates to the technical field of piezoelectric pumps, in particular to a novel valveless piezoelectric fluid driven pump. Background Art

[0002] Piezoelectric pumps are a new type of fluid actuator. Compared to traditional pumps, they don't require an additional drive motor. Instead, they utilize the inverse piezoelectric effect of smaller piezoelectric ceramics to deform the piezoelectric oscillator. This deformation then creates a change in the pump chamber's volume, achieving fluid output.

[0003] However, most of the existing piezoelectric pumps are valved piezoelectric pumps. The movable component valve of the valved piezoelectric pump undergoes a periodic switching process under the action of pressure, thereby controlling the unidirectional flow of the fluid. However, due to the presence of the valve, the piezoelectric pump has the disadvantages of increased pressure loss and large disturbance to the fluid. At the same time, the cost of the valve is relatively high. Frequent use of the valve to control the flow direction of the liquid reduces the service life of the valve. When the valve body is damaged, the device cannot be used, which increases the cost of equipment use.

[0004] For example, the invention patent application with application publication number CN114992098A discloses a resonant excitation piezoelectric pump, which uses an arc-shaped pump cavity and a mass block. When one end of the piezoelectric vibrator pump cavity is bent and deformed, it can fit completely with the pump cavity, reducing the dead corner volume and increasing the output performance of the piezoelectric pump. Summary of the Invention

[0005] The purpose of the present utility model is to provide a novel valveless piezoelectric fluid driven pump to solve the problems raised in the above background technology.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A new type of valveless piezoelectric fluid-driven pump includes: a pump body, a liquid inlet pipe is installed on the left side of the pump body, a liquid outlet pipe is installed on the right side of the pump body, a pump chamber is opened in the pump body, and the liquid inlet pipe and the liquid outlet pipe are both connected to the pump chamber; a pump core assembly is installed in the pump chamber for controlling the flow direction of the fluid; a piezoelectric vibrator is installed in the pump body at the upper end of the pump chamber, and a pump cover is also installed at the upper end of the piezoelectric vibrator.

[0008] As a preferred solution, a side of the pump chamber close to the liquid outlet pipe is provided with a rounded corner. By providing the rounded corner, a better flow path can be provided for the fluid to flow out of the pump chamber.

[0009] As a preferred solution, a sealing groove is further provided on opposite sides of the pump body and the pump cover, and a sealing ring is installed in the sealing groove. By providing the sealing ring, the sealing performance of the piezoelectric pump can be improved.

[0010] As a preferred solution, the pump cover is threadedly mounted on the pump body.

[0011] As a preferred solution, the pump core assembly includes a trapezoidal body mounted within the pump cavity, with an end dome mounted on the left side of the trapezoidal body and a tail step mounted on the right side. The end dome reduces energy lost during forward impact of the fluid and allows for fluid diversion.

[0012] As a preferred solution, the cross-section of the trapezoidal body gradually increases from left to right. By providing a trapezoidal body with a gradually increasing cross-section from left to right, two gradually converging flow channels can be formed in conjunction with the pump chamber. The flow rate of the fluid through the converging flow channels gradually increases, promoting more fluid outflow. When the fluid flows back into the pump chamber from the outlet pipe and strikes the right end of the trapezoidal body, it will generate more energy loss, thereby reducing the amount of fluid reflux.

[0013] As a preferred solution, the tail step includes an upper step and a lower step, with the upper step being 3mm high and the lower step being 5mm high. By providing the tail step, the backflowing liquid loses a significant amount of energy when it strikes the tail step, thereby reducing fluid backflow. Furthermore, during forward flow, the fluid can flow into the outlet pipe through the gap between the two steps, thereby increasing the output capacity of the piezoelectric pump.

[0014] Compared with the existing technology, the beneficial effects of the present invention are as follows: by providing a trapezoidal main body with a gradually increasing cross-section from left to right, two gradually contracting flow channels can be formed in conjunction with the pump chamber. The flow rate generated when the fluid passes through the contracting flow channels gradually increases, prompting more fluid to flow out; when the fluid flows back from the liquid outlet pipe into the pump chamber and hits the right end of the trapezoidal main body, more energy loss will be generated, thereby reducing the amount of fluid reflux. The present invention has a reasonable structure and utilizes the different fluid resistance of the pump chamber and the pump body assembly to achieve unidirectional fluid flow. It can achieve unidirectional fluid flow without valve control, which can effectively reduce the cost of the piezoelectric pump and better meet the needs of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall three-dimensional structure of a new type of valveless piezoelectric fluid-driven pump;

[0016] Figure 2 This is a schematic diagram of the top view of a new type of valveless piezoelectric fluid driven pump;

[0017] Figure 3 A new type of valveless piezoelectric fluid driven pump Figure 2 Schematic diagram of the cross-sectional structure at AA in the middle;

[0018] Figure 4 This is a schematic diagram of the three-dimensional structure of a new type of valveless piezoelectric fluid driven pump at the pump body position;

[0019] Figure 5 This is a schematic diagram of the three-dimensional structure of a new type of valveless piezoelectric fluid-driven pump with the pump core assembly hidden at the pump body position;

[0020] Figure 6 This is a schematic diagram of the three-dimensional structure of the pump core assembly of a new valveless piezoelectric fluid-driven pump.

[0021] In the figure: 1. Pump body; 11. Liquid inlet pipe; 12. Liquid outlet pipe; 13. Pump chamber; 131. Fillet; 14. Sealing groove; 15. Sealing ring; 2. Pump cover; 21. Anti-slip groove; 3. Pump core assembly; 31. Trapezoidal body; 32. Tail step; 33. End dome; 4. Piezoelectric vibrator. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] Example: See Figures 1 to 6 A novel valveless piezoelectric fluid-driven pump comprises: a pump body 1, a liquid inlet pipe 11 is installed on the left side of the pump body 1, a liquid outlet pipe 12 is installed on the right side of the pump body 1, a pump chamber 13 is opened in the pump body 1, and the liquid inlet pipe 11 and the liquid outlet pipe 12 are both connected to the pump chamber 13; a pump core assembly 3 is installed in the pump chamber 13 for controlling the flow direction of the fluid; a piezoelectric vibrator 4 is installed in the pump body 1 at the upper end of the pump chamber 13, and a pump cover 2 is also installed at the upper end of the piezoelectric vibrator 4. A rounded corner 131 is provided on one side of the pump chamber 13 close to the liquid outlet pipe 12. In this embodiment, the pump core assembly 3 includes a trapezoidal main body 31 installed in the pump chamber 13, an end dome 33 is installed on the left side of the trapezoidal main body 31, and a tail step 32 is provided on the right side of the trapezoidal main body 31. The cross-section of the trapezoidal main body 31 gradually increases from left to right, and the tail step 32 includes an upper step and a lower step, wherein the upper step is 3 mm high and the lower step is 5 mm high.

[0024] The working principle of the present invention is as follows: when the piezoelectric vibrator 4 is stimulated by a positive alternating current signal, it bends and deforms upward, the internal volume of the pump chamber 13 increases, the pressure decreases, and the liquid is simultaneously sucked into the pump chamber 13 through the liquid inlet pipe 11 and the liquid outlet pipe 12. The energy lost by the fluid entering the pump chamber 13 from the liquid inlet pipe 11 and hitting the top corner of the end dome 33 is lower than the energy lost by the fluid entering the pump chamber 13 from the liquid outlet pipe 12 and hitting the right vertical surface of the trapezoidal body 31. Therefore, more fluid enters the pump chamber 13 through the liquid inlet pipe 11. In this process, the backflow of the fluid flowing into the pump chamber 13 from the liquid outlet pipe 12 is reduced.

[0025] When the piezoelectric vibrator 4 is stimulated by the reverse AC signal, it bends downward and deforms. At this time, the volume inside the pump chamber 13 gradually decreases to the lowest point, and the pressure gradually rises to the highest point. At this time, the fluid in the pump chamber 13 is discharged from the pump body 1 through the liquid inlet pipe 11 and the liquid outlet pipe 12 at the same time. Since the flow channels on both sides of the trapezoidal main body 31 gradually narrow, the fluid can obtain a higher flow rate when flowing through the flow channels. It then flows to the end rounded corner 131 and is directed to the liquid outlet pipe 12 and flows out of the pump body 1. Compared with the energy lost by the fluid hitting the rounded corner 131 on the right side of the pump chamber 13, the energy lost by hitting the vertical end position on the left side of the pump chamber 13 is greater, and more fluid flows out of the pump body 1 through the liquid outlet pipe 12. After the above working process is continuously operated, a directional flow of the fluid can be formed without setting a valve.

[0026] In order to improve the sealing performance of the pump body 1 , a sealing groove 14 is further provided on the opposite sides of the pump body 1 and the pump cover 2 , and a sealing ring 15 is installed in the sealing groove 14 .

[0027] As a further solution, the pump cover 2 is screwed onto the pump body 1 . In order to facilitate the rotation of the pump cover 2 , the side wall of the pump cover 2 is provided with anti-slip grooves 21 .

[0028] In the present invention, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", "bottom", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are merely relational words determined for the convenience of describing the structural relationships of the various parts or elements of the present invention, and do not specifically refer to any part or element in the present invention, and cannot be understood as a limitation on the present invention.

Claims

1. A new type of valveless piezoelectric fluid driven pump, characterized in that: include: A pump body (1), wherein a liquid inlet pipe (11) is installed on the left side of the pump body (1), and a liquid outlet pipe (12) is installed on the right side of the pump body (1); a pump cavity (13) is opened in the pump body (1), and the liquid inlet pipe (11) and the liquid outlet pipe (12) are both in communication with the pump cavity (13); A pump core assembly (3) is installed in the pump cavity (13) and is used to control the flow direction of the fluid; the pump core assembly (3) includes a trapezoidal body (31) installed in the pump cavity (13), an end dome (33) is installed on the left side of the trapezoidal body (31), and a tail step (32) is provided on the right side of the trapezoidal body (31); The cross section of the trapezoidal body (31) gradually increases from left to right; The upper end of the pump cavity (13) further comprises a piezoelectric vibrator (4) mounted in the pump body (1), and the upper end of the piezoelectric vibrator (4) further comprises a pump cover (2).

2. A novel valveless piezoelectric fluid driven pump according to claim 1, characterized in that: A rounded corner (131) is provided on one side of the pump chamber (13) close to the liquid outlet pipe (12).

3. A novel valveless piezoelectric fluid driven pump according to claim 2, characterized in that: A sealing groove (14) is further provided on opposite sides of the pump body (1) and the pump cover (2), and a sealing ring (15) is installed in the sealing groove (14).

4. A novel valveless piezoelectric fluid driven pump according to claim 3, characterized in that: The pump cover (2) is screwed onto the pump body (1).

5. A novel valveless piezoelectric fluid driven pump according to claim 4, characterized in that: The tail step (32) comprises an upper step and a lower step, wherein the upper step is 3 mm high and the lower step is 5 mm high.

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