Valveless piezoelectric pump with flow guide column structure

Abstract

The utility model relates to the technical field of piezoelectric pumps, in particular to a valveless piezoelectric pump with a flow guide column structure, which comprises a pump cover, a pump body and a piezoelectric vibrator, the pump cover covers the pump body and is fixedly connected with the pump body, the piezoelectric vibrator is mounted between the pump body and the pump cover, and the axis of a liquid inlet on the pump body is perpendicular to the axis of a liquid outlet. A first arc-shaped flow guide column, a second arc-shaped flow guide column, a third arc-shaped flow guide column and a fourth arc-shaped flow guide column are arranged in an inner cavity of the pump body, the first flow guide column and the third flow guide column are located on the two sides of the axis of the liquid outlet, and the second flow guide column and the fourth flow guide column are located on the two sides of the axis of the liquid outlet and are closer to the liquid inlet. According to the valveless piezoelectric pump, the liquid inlet amount of the liquid inlet is larger than that of the liquid outlet in the liquid inlet process of the piezoelectric pump through the arrangement of the arc-shaped flow guide columns, the liquid outlet amount of the liquid outlet is larger than that of the liquid inlet in the liquid outlet process, and the piezoelectric pump can continuously and stably output liquid outwards; and the problems of serious backflow and unstable output flow of the piezoelectric pump are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of piezoelectric pumps, and more specifically, to a valveless piezoelectric pump with a guide column structure. Background Art

[0002] As a new type of pump, a piezoelectric pump is a miniature positive displacement pump driven by a piezoelectric vibrator. Its integrated pump and valve make the piezoelectric pump more compact and significantly reduce its size. Its advantages include a simple structure that facilitates mass production, a small size that facilitates miniaturization, ease of digital control, and a long lifespan. Piezoelectric pumps have broad application prospects in instrumentation, testing equipment, and mechatronics. Piezoelectric pumps include valved and valveless piezoelectric pumps. The "valve" structure in the valveless pump creates unequal resistance to the liquid being drawn in or discharged through the inlet and outlet of the pump chamber, creating a flow resistance differential. This creates a "valve" function, fulfilling the role of a valve.

[0003] However, since the water inlet of the valveless piezoelectric pump can also discharge water and the water outlet can also take water in, the valveless piezoelectric pump has the problems of severe backflow and unstable output flow during operation. Utility Model Content

[0004] The purpose of the present utility model is to overcome the shortcomings of the existing valveless piezoelectric pump in the operation process, such as severe backflow and unstable output flow, and to provide a valveless piezoelectric pump with a guide column structure. The valveless piezoelectric pump in this scheme can reduce liquid backflow through the arrangement of an arc-shaped guide column, thereby achieving the purpose of stabilizing the output flow.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a valveless piezoelectric pump with a guide column structure, comprising a pump cover, a pump body and a piezoelectric vibrator, the pump cover being covered on the pump body and fixedly connected to the pump body, the piezoelectric vibrator being installed between the pump body and the pump cover, the liquid inlet axis on the pump body being perpendicular to the liquid outlet axis, the inner cavity of the pump body being provided with a second guide column, a third guide column and a fourth guide column in the shape of an arc-shaped first guide column, the first guide column and the third guide column and the second guide column and the fourth guide column being respectively located on both sides of the liquid outlet axis, and the first guide column and the third guide column are closer to the liquid inlet; a first flow channel is formed between the arc-shaped side wall of the first guide column and the pump body; a second flow channel is formed between the arc-shaped side wall of the second guide column and the pump body, and the arc-shaped side walls of the third guide column and the fourth guide column are respectively located on one end of the first flow channel and the second flow channel close to the liquid outlet. A third flow channel is formed between the planar side wall of the first guide column and the planar side wall of the second guide column, and a fourth flow channel is formed between the planar side wall of the third guide column and the planar side wall of the fourth guide column. The axis of the third flow channel, the axis of the fourth flow channel and the axis of the liquid outlet coincide with each other. The width of the first flow channel is smaller than the width of the second flow channel. The second flow channel and the fourth flow channel are connected through the gap between the second guide column and the fourth guide column.

[0006] When the valveless piezoelectric pump of the present invention is in operation, a sinusoidal alternating current signal is first applied to the piezoelectric vibrator. Under the action of the positive alternating current, the piezoelectric vibrator undergoes a positive upward deformation. At this point, the internal space of the pump body increases, the pressure decreases, and under the action of external atmospheric pressure, liquid is simultaneously pressed into the inner cavity of the pump body through the liquid inlet and liquid outlet. Liquid entering the inner cavity of the pump body through the liquid inlet enters the first flow channel, a portion of which flows along the first flow channel to the liquid outlet, while the remaining portion flows along the first flow channel to the second and third flow channels. The liquid flowing toward the liquid outlet is blocked by the curved side of the third guide column, preventing it from continuing to move forward. The liquid flowing toward the second and third flow channels smoothly enters the second and third flow channels. Liquid entering the inner cavity of the pump body through the liquid outlet directly enters the fourth flow channel and then flows along the fourth flow channel into the third flow channel. Once the first, second, third, and fourth flow channels are filled with liquid, the piezoelectric vibrator stops deforming upward, and liquid no longer enters the inner cavity of the pump body. When liquid is taken in by the liquid inlet, the liquid flow can quickly enter the second flow channel and the third flow channel as it moves along the curved side of the first guide column. When liquid is taken in by the liquid outlet, it will only flow into the second flow channel under the premise that the fourth flow channel and the third flow channel are full. Therefore, during the liquid intake process, the liquid intake amount of the liquid inlet is greater than the liquid intake amount of the liquid outlet.

[0007] When a negative alternating current is applied to the piezoelectric vibrator, it deforms downward under the influence of the negative alternating current. This causes the internal volume of the pump body to decrease, increasing the pressure, and causing the liquid within the pump body to be discharged simultaneously through the inlet and outlet. Liquid in the first flow channel preferentially discharges through the inlet. Liquid in the third and fourth flow channels preferentially discharges through the outlet. Some liquid in the second flow channel passes through the gap between the second and fourth guide posts and enters the fourth flow channel, where it is discharged through the outlet. The remaining liquid enters the third flow channel and the first flow channel, respectively. Liquid entering the third flow channel is ultimately discharged through the outlet, while liquid entering the first flow channel is ultimately discharged through the inlet. Because the inlet of the third flow channel is closer to the outlet of the second flow channel than the inlet of the first flow channel, more liquid from the third flow channel enters the second flow channel than enters the first flow channel. This means that during discharge, more liquid is discharged through the outlet than through the inlet. During the operation of the piezoelectric pump, the liquid intake process and the liquid discharge process are continuously switched, and the liquid is pumped out stably and continuously.

[0008] The valveless piezoelectric pump in the utility model, through the arrangement of the arc-shaped guide column, makes the liquid inlet of the piezoelectric pump greater than the liquid inlet of the liquid outlet during the liquid intake process, and the liquid outlet of the liquid outlet is greater than the liquid outlet of the liquid inlet during the liquid discharge process. The piezoelectric pump can output continuously and stably to the outside, and the output volume is sufficient, avoiding the problem of unstable output flow due to backflow of the piezoelectric pump.

[0009] Furthermore, the ends of the first guide column and the second guide column away from the liquid outlet are both provided with chamfered corners, and the width of the end of the first flow channel away from the liquid outlet is smaller than the width of the end of the second flow channel away from the liquid outlet. Providing chamfered corners on the ends of the first guide column and the second guide column away from the liquid outlet makes it easier for the liquid in the first flow channel and the third flow channel to enter the second flow channel when liquid is inlet, and for the liquid in the second flow channel to enter the first flow channel and the third flow channel when liquid is out. The width of the end of the first flow channel away from the liquid outlet is smaller than the width of the end of the second flow channel away from the liquid outlet. When the liquid in the third flow channel flows out, it will be blocked by the chamfered corner of the first flow channel, further ensuring that when liquid is out, more liquid in the second flow channel flows into the third flow channel.

[0010] Furthermore, the width of the third flow channel is greater than the width of the fourth flow channel, and the third guide column and the fourth guide column are both provided with chamfers at one end close to the third flow channel. The width of the third flow channel is greater than the width of the fourth flow channel, making the fourth flow channel narrower, further reducing the liquid flow rate in the third flow channel when liquid enters the liquid outlet, thereby reducing the amount of liquid entering the liquid outlet. At the same time, the chamfers on the third guide column and the fourth guide column enable the liquid in the third flow channel to smoothly enter the fourth flow channel when liquid is discharged, further accelerating the liquid discharge speed of the liquid outlet. While reducing the liquid inlet speed of the liquid outlet, the liquid discharge speed of the liquid outlet is accelerated, further ensuring that the liquid inlet volume of the piezoelectric pump at the liquid outlet is less than the liquid outlet volume, thereby increasing the output flow rate of the piezoelectric pump.

[0011] Furthermore, the gap between the first and third guide pillars is smaller than the gap between the second and fourth guide pillars. The gap between the first and third guide pillars is smaller than the gap between the second and fourth guide pillars, so that when liquid is introduced, the portion of liquid in the fourth flow channel that directly enters the first flow channel is smaller than the portion that directly enters the second flow channel; when liquid is discharged, it is difficult for the liquid in the third flow channel to directly enter the first flow channel, and more of the liquid is discharged from the liquid outlet through the fourth flow channel.

[0012] Furthermore, the gap between the second guide post and the fourth guide post forms a fifth flow channel, and the width of the fifth flow channel at one end close to the third flow channel is smaller than the width of the fifth flow channel at one end away from the third flow channel. The width of the fifth flow channel at one end close to the third flow channel is smaller than the width of the end away from the third flow channel, which facilitates the flow of liquid from the second flow channel into the fourth flow channel through the fifth flow channel during discharge.

[0013] Furthermore, the third and fourth guide posts are each provided with a check groove at one end near the liquid outlet. The check groove is arc-shaped, with its opening facing the liquid outlet. The arrangement of the check groove ensures that, when liquid is introduced into the liquid outlet, a portion of the liquid flows into the check groove and then flows back toward the liquid outlet along the check groove, causing a flow conflict at the liquid outlet and further reducing the amount of liquid entering the liquid outlet.

[0014] Furthermore, it also includes two sealing rings, which are respectively located on both sides of the piezoelectric vibrator. When the piezoelectric vibrator is installed between the pump body and the pump cover, the two sealing rings are respectively in contact with the pump body and the pump cover. Both the pump body and the pump cover are provided with positioning grooves, and the two sealing rings are respectively located in the positioning grooves on the pump body and the positioning grooves on the pump cover. After the sealing rings are respectively provided on both sides of the piezoelectric vibrator, the airtightness of the piezoelectric pump can be further increased. The provision of the positioning grooves facilitates the determination of the installation positions of the two sealing rings on the piezoelectric pump, and facilitates the installation of the sealing rings.

[0015] Furthermore, the pump cover is provided with a lead outlet, through which a wire connected to the piezoelectric ceramic of the piezoelectric vibrator passes and is connected to the piezoelectric ceramic on the piezoelectric vibrator. Providing the lead outlet on the pump cover does not affect the volume and sealing performance of the pump.

[0016] Furthermore, the pump cover and the pump body are provided with positioning holes for the bolts to pass through. The positioning holes in the pump cover and the positioning holes in the pump body are coaxial, and the bolts are fitted with nuts. The pump cover and the pump body are locked and fixed by the bolts and nuts, providing a strong connection and easy assembly and disassembly.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] The utility model provides a valveless piezoelectric pump with a guide column structure. Through the arrangement of the arc-shaped guide column, the liquid inlet of the piezoelectric pump is greater than the liquid inlet of the liquid outlet during the liquid intake process, and the liquid outlet is greater than the liquid outlet during the liquid discharge process. The piezoelectric pump can output outward continuously and stably, and the output volume is sufficient, avoiding the problem of unstable output flow due to backflow of the piezoelectric pump.

[0019] The width of the first flow channel at one end away from the liquid outlet is smaller than the width of the second flow channel at one end away from the liquid outlet. When the liquid in the third flow channel flows out, it will be blocked by the rounded corner of the first flow channel, further ensuring that when the liquid is discharged, more liquid in the second flow channel flows into the third flow channel.

[0020] The width of the third flow channel is greater than that of the fourth flow channel, making the fourth flow channel narrower. This further reduces the liquid flow rate within the third flow channel when liquid enters the liquid outlet, thereby reducing the amount of liquid entering the liquid outlet. Furthermore, the chamfered corners on the third and fourth guide columns allow liquid in the third flow channel to flow smoothly into the fourth flow channel during discharge, further accelerating the liquid discharge rate from the liquid outlet. This reduces the liquid inlet velocity at the liquid outlet while simultaneously increasing the liquid outlet velocity, further ensuring that the liquid inlet volume of the piezoelectric pump at the liquid outlet is less than the liquid outlet volume, thereby increasing the output flow rate of the piezoelectric pump.

[0021] The arrangement of the arc-shaped check groove ensures that when the liquid is introduced into the liquid outlet, a portion of the liquid flows into the check groove and then flows back to the liquid outlet along the check groove, causing a liquid flow conflict at the liquid outlet and further reducing the liquid inflow into the liquid outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of a valveless piezoelectric pump with a guide column structure;

[0023] Figure 2 This is a schematic diagram of the structure of a pump body of a valveless piezoelectric pump with a guide column structure;

[0024] Figure 3A valveless piezoelectric pump with a guide column structure Figure 2 A magnified view of part A in FIG;

[0025] Figure 4 This is an exploded view of a valveless piezoelectric pump with a guide column structure;

[0026] Figure 5 This is a structural schematic diagram of a pump body of a valveless piezoelectric pump with a guide column structure from another angle;

[0027] Figure 6 This is a structural schematic diagram of a pump cover of a valveless piezoelectric pump with a guide column structure.

[0028] In the accompanying drawings: 1. Pump cover; 2. Pump body; 3. Piezoelectric vibrator; 201. Liquid inlet; 202. Liquid outlet; 4. First guide column; 5. Second guide column; 6. Third guide column; 7. Fourth guide column; 8. First flow channel; 9. Second flow channel; 10. Third flow channel; 11. Fourth flow channel; 12. Chamfered corner; 13. Chamfer; 14. Fifth flow channel; 15. Check groove; 16. Sealing ring; 17. Positioning groove; 19. Bolt; 20. Nut; 101. Lead wire outlet. DETAILED DESCRIPTION

[0029] The present invention is further described below in conjunction with specific embodiments. The accompanying drawings are for illustrative purposes only and are schematic, not actual, representations. They should not be construed as limiting this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted from the drawings.

[0030] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and so on indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0031] Example 1

[0032] This embodiment is the first embodiment of a valveless piezoelectric pump with a guide column structure. Figure 1-Figure 3As shown, it includes a pump cover 1, a pump body 2 and a piezoelectric vibrator 3. The pump cover 1 is covered on the pump body 2 and fixedly connected to the pump body 2. The piezoelectric vibrator 3 is installed between the pump body 2 and the pump cover 1. The axis of the liquid inlet 201 on the pump body 2 is perpendicular to the axis of the liquid outlet 202. The inner cavity of the pump body 2 is provided with a second guide column 5, a third guide column 6 and a fourth guide column 7 of an arc-shaped first guide column 4. The first guide column 4 and the third guide column 6 are respectively located on both sides of the axis of the liquid outlet 202 and the first guide column 4 and the third guide column 6 are closer to the liquid inlet 201; a first flow channel 8 is formed between the arc-shaped side wall of the first guide column 4 and the pump body 2; a second flow channel 9 is formed between the arc-shaped side wall of the second guide column 5 and the pump body 2, and the arc-shaped side walls of the third guide column 6 and the fourth guide column 7 are respectively located on the first flow channel 8 and the second flow channel 9 at one end close to the liquid outlet 202. A third flow channel 10 is formed between the planar side wall of the first guide column 4 and the planar side wall of the second guide column 5, and a fourth flow channel 11 is formed between the planar side wall of the third guide column 6 and the planar side wall of the fourth guide column 7. The axis of the third flow channel 10, the axis of the fourth flow channel 11 and the axis of the liquid outlet 202 coincide with each other, the width of the first flow channel 8 is smaller than the width of the second flow channel 9, and the second flow channel 9 is connected to the fourth flow channel 11 through the gap between the second guide column 5 and the fourth guide column 7.

[0033] The working principle or working process of this embodiment is as follows:

[0034] When the valveless piezoelectric pump of this embodiment is in operation, a sinusoidal AC signal is first applied to the piezoelectric vibrator 3. Under the action of the positive AC current, the piezoelectric vibrator 3 deforms upward. At this point, the internal space of the pump body 2 increases, and the pressure decreases. Under the action of external atmospheric pressure, liquid is simultaneously pressed into the inner cavity of the pump body 2 through the liquid inlet 201 and the liquid outlet 202. Liquid entering the inner cavity of the pump body 2 through the liquid inlet 201 enters the first flow channel 8, partially flowing along the first flow channel 8 toward the liquid outlet 202, while the remaining portion flows along the first flow channel 8 toward the second flow channel 9 and the third flow channel 10. The liquid flowing toward the liquid outlet 202 is blocked by the curved side of the third guide column 6, preventing it from continuing to move forward. Liquid flowing toward the second and third flow channels 9 and 10 flows smoothly into the second and third flow channels 9 and 10. Liquid entering the inner cavity of the pump body 2 through the liquid outlet 202 directly enters the fourth flow channel 11 and then flows along the fourth flow channel 11 into the third flow channel 10. After the first flow channel 8, the second flow channel 9, the third flow channel 10, and the fourth flow channel 11 are all filled with liquid, the piezoelectric vibrator 3 stops deforming upward, and liquid stops flowing into the inner cavity of the pump body 2. When liquid is flowing into the liquid inlet 201, the liquid flow can quickly enter the second flow channel 9 and the third flow channel 10 as it advances along the curved side surface of the first guide column 4. When liquid is flowing into the liquid outlet 202, it will only flow into the second flow channel 9 when the fourth flow channel 11 and the third flow channel 10 are full. Therefore, during the liquid inlet process, the amount of liquid flowing into the liquid inlet 201 is greater than the amount of liquid flowing into the liquid outlet 202.

[0035] When negative AC is applied to the piezoelectric vibrator 3, it deforms downward under the action of the negative AC current. This reduces the internal volume of the pump body 2, increasing the pressure. The liquid in the pump body 2 is discharged simultaneously through the liquid inlet 201 and the liquid outlet 202. The liquid in the first flow channel 8 is preferentially discharged through the liquid inlet 201. The liquid in the third and fourth flow channels 10 and 11 is preferentially discharged through the liquid outlet 202. A portion of the liquid in the second flow channel 9 enters the fourth flow channel 11 through the gap between the second guide column 5 and the fourth guide column 7 and is then discharged outward through the liquid outlet 202. The other portion enters the third flow channel 10 and the first flow channel 8 respectively. The liquid entering the third flow channel 10 is finally discharged outward through the liquid outlet 202, and the liquid entering the first flow channel 8 is finally discharged outward through the liquid inlet 201. Since the liquid inlet end of the third flow channel 10 is closer to the liquid outlet end of the second flow channel 9 than the liquid inlet end of the first flow channel 8 during liquid discharge, more liquid in the third flow channel 10 enters the second flow channel 9 than enters the first flow channel 8. That is, when discharging liquid, more liquid is discharged outward from the liquid outlet 202 than from the liquid inlet 201. During operation, the piezoelectric pump continuously switches between the liquid inlet and liquid discharge processes to pump liquid outward stably and continuously.

[0036] The beneficial effects of this embodiment are as follows: the valveless piezoelectric pump in the utility model, through the setting of the arc-shaped guide column, makes the liquid inflow of the piezoelectric pump at the liquid inlet 201 greater than the liquid inflow of the liquid outlet 202 during the liquid intake process, and the liquid discharge of the liquid outlet 202 is greater than the liquid discharge of the liquid inlet 201 during the liquid discharge process. The piezoelectric pump can output continuously and stably to the outside, and the output volume is sufficient, avoiding the problem of unstable output flow due to backflow of the piezoelectric pump.

[0037] Example 2

[0038] This embodiment is a second embodiment of a valveless piezoelectric pump with a guide column structure. This embodiment is based on the first embodiment. Figure 2 and Figure 3 As shown, the structures of the guide columns and flow channels are further defined.

[0039] Specifically, the first guide column 4 and the second guide column 5 are both provided with a chamfered corner 12 at one end away from the liquid outlet 202 , and the width of the first flow channel 8 at one end away from the liquid outlet 202 is smaller than the width of the second flow channel 9 at one end away from the liquid outlet 202 .

[0040] Specifically, the width of the third flow channel 10 is greater than that of the fourth flow channel 11 , and the third guide column 6 and the fourth guide column 7 are both provided with a chamfer 13 at one end close to the third flow channel 10 .

[0041] Specifically, the gap between the first guide column 4 and the third guide column 6 is smaller than the gap between the second guide column 5 and the fourth guide column 7. The gap between the second guide column 5 and the fourth guide column 7 forms the fifth flow channel 14, and the width of the fifth flow channel 14 at the end close to the third flow channel 10 is smaller than the width of the fifth flow channel 14 at the end away from the third flow channel 10.

[0042] Specifically, a check groove 15 is provided on one end of the third guide column 6 and the fourth guide column 7 close to the liquid outlet 202 . The check groove 15 is arc-shaped, and the opening of the arc-shaped check groove 15 faces the liquid outlet 202 .

[0043] The beneficial effects of this embodiment are as follows:

[0044] Rounded corners 12 are provided on the ends of the first and second guide posts 4 and 5 away from the liquid outlet 202, making it easier for liquid in the first and third flow channels 8 and 10 to flow into the second flow channel 9 during inlet, and for liquid in the second flow channel 9 to flow into the first and third flow channels 8 and 10 during outlet. The width of the end of the first flow channel 8 away from the liquid outlet 202 is smaller than the width of the end of the second flow channel 9 away from the liquid outlet 202. Liquid in the third flow channel 10 is blocked by the rounded corners 12 of the first flow channel 8 when it flows out, further ensuring that more liquid in the second flow channel 9 flows into the third flow channel 10 during outlet.

[0045] The width of the third flow channel 10 is greater than that of the fourth flow channel 11, making the fourth flow channel 11 narrower, further reducing the liquid flow rate in the third flow channel 10 when liquid enters the liquid outlet 202, thereby reducing the amount of liquid entering the liquid outlet 202. At the same time, the chamfers 13 on the third guide column 6 and the fourth guide column 7 allow the liquid in the third flow channel 10 to smoothly enter the fourth flow channel 11 when liquid is discharged, further accelerating the liquid discharge rate of the liquid outlet 202. While reducing the liquid inlet rate of the liquid outlet 202, the liquid outlet rate of the liquid outlet 202 is accelerated, further ensuring that the liquid inlet amount of the piezoelectric pump at the liquid outlet 202 is less than the liquid outlet amount, thereby increasing the output flow rate of the piezoelectric pump.

[0046] The gap between the first guide column 4 and the third guide column 6 is smaller than the gap between the second guide column 5 and the fourth guide column 7. This allows the portion of liquid in the fourth flow channel 11 that directly enters the first flow channel 8 to be smaller than the portion that directly enters the second flow channel 9 during liquid inflow. During liquid outflow, the liquid in the third flow channel 10 is less likely to directly enter the first flow channel 8, with more of it being discharged from the liquid outlet 202 through the fourth flow channel 11. The width of the fifth flow channel 14 near the end of the third flow channel 10 is smaller than the width away from the end of the third flow channel 10, making it easier for the liquid in the second flow channel 9 to enter the fourth flow channel 11 through the fifth flow channel 14 during liquid outflow.

[0047] The setting of the check groove 15 ensures that when liquid is introduced into the liquid outlet 202, a portion of the liquid flows into the check groove 15 and then flows back to the liquid outlet 202 along the check groove 15, causing liquid flow conflict at the liquid outlet 202, further reducing the liquid inflow into the liquid outlet 202.

[0048] Example 3

[0049] This embodiment is a third embodiment of a valveless piezoelectric pump with a guide column structure. This embodiment is based on the first and second embodiments. Figure 4-Figure 6 As shown, the structure of the piezoelectric pump is further limited.

[0050] Specifically, two sealing rings 16 are further included. The two sealing rings 16 are respectively located on either side of the piezoelectric vibrator 3. When the piezoelectric vibrator 3 is installed between the pump body 2 and the pump cover 1, the two sealing rings 16 respectively abut against the pump body 2 and the pump cover 1. Positioning grooves 17 are provided on both the pump body 2 and the pump cover 1, and the two sealing rings 16 are respectively located in the positioning grooves 17 on the pump body 2 and the positioning grooves 17 on the pump cover 1.

[0051] Specifically, the pump cover 1 is further provided with a lead outlet 101 , through which a wire connected to the piezoelectric ceramic of the piezoelectric vibrator 3 passes through the lead outlet 101 and is connected to the piezoelectric ceramic on the piezoelectric vibrator 3 .

[0052] Specifically, it also includes a bolt 19. Both the pump cover 1 and the pump body 2 are provided with positioning holes for the bolt 19 to pass through. The positioning hole on the pump cover 1 is coaxial with the positioning hole on the pump body 2. A nut 20 is also sleeved on the bolt 19.

[0053] The beneficial effects of this embodiment are as follows:

[0054] Sealing rings 16 are installed on either side of the piezoelectric vibrator 3 to further enhance the piezoelectric pump's airtightness. Positioning grooves 17 facilitate positioning of the two sealing rings 16 within the piezoelectric pump, facilitating installation. A wire lead-out port 101 is provided on the pump cover 1 without affecting the pump's internal volume or sealing. Bolts 19 and nuts 20 secure the pump cover 1 to the pump body 2, ensuring a strong connection and easy assembly and disassembly.

[0055] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. A person skilled in the art will be able to make other variations or modifications based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A valveless piezoelectric pump with a guide column structure, characterized in that: The pump comprises a pump cover (1), a pump body (2) and a piezoelectric vibrator (3), wherein the pump cover (1) covers the pump body (2) and is fixedly connected to the pump body (2), the piezoelectric vibrator (3) is installed between the pump body (2) and the pump cover (1), the axis of the liquid inlet (201) on the pump body (2) is perpendicular to the axis of the liquid outlet (202), the inner cavity of the pump body (2) is provided with an arc-shaped first guide column (4), a second guide column (5), a third guide column (6) and a fourth guide column (7), the first guide column (4) and the third guide column (6) and the second guide column (5) and the fourth guide column (7) are respectively located on both sides of the axis of the liquid outlet (202), and the first guide column (4) and the third guide column (6) are closer to the liquid inlet (201); A first flow channel (8) is formed between the arcuate side wall of the first guide column (4) and the pump body (2); a second flow channel (9) is formed between the arcuate side wall of the second guide column (5) and the pump body (2); the arcuate side walls of the third guide column (6) and the fourth guide column (7) are respectively located on one end of the first flow channel (8) and the second flow channel (9) close to the liquid outlet (202); a third flow channel (8) is formed between the plane side wall of the first guide column (4) and the plane side wall of the second guide column (5); A flow channel (10), a fourth flow channel (11) is formed between the plane side wall of the third guide column (6) and the plane side wall of the fourth guide column (7), the axis of the third flow channel (10), the axis of the fourth flow channel (11) and the axis of the liquid outlet (202) coincide with each other, the width of the first flow channel (8) is smaller than the width of the second flow channel (9), and the second flow channel (9) and the fourth flow channel (11) are connected through the gap between the second guide column (5) and the fourth guide column (7); The pump cover (1) is also provided with a lead outlet (101), and a lead wire connected to the piezoelectric ceramic of the piezoelectric vibrator (3) passes through the lead outlet (101) and is connected to the piezoelectric ceramic on the piezoelectric vibrator (3).

2. A valveless piezoelectric pump with a guide column structure according to claim 1, characterized in that: The first guide column (4) and the second guide column (5) are both provided with a rounded corner (12) on one end away from the liquid outlet (202), and the width of the first flow channel (8) on the end away from the liquid outlet (202) is smaller than the width of the second flow channel (9) on the end away from the liquid outlet (202).

3. The valveless piezoelectric pump with a guide column structure according to claim 1, characterized in that: The width of the third flow channel (10) is greater than the width of the fourth flow channel (11), and the third guide column (6) and the fourth guide column (7) are both provided with chamfers (13) at one end close to the third flow channel (10).

4. A valveless piezoelectric pump with a guide column structure according to claim 3, characterized in that: The gap between the first guide column (4) and the third guide column (6) is smaller than the gap between the second guide column (5) and the fourth guide column (7).

5. The valveless piezoelectric pump with a guide column structure according to claim 4, characterized in that: The gap between the second guide column (5) and the fourth guide column (7) is a fifth flow channel (14), and the width of the fifth flow channel (14) at one end close to the third flow channel (10) is smaller than the width of the fifth flow channel (14) at one end away from the third flow channel (10).

6. The valveless piezoelectric pump with a guide column structure according to claim 3, characterized in that: A check groove (15) is provided on one end of the third guide column (6) and the fourth guide column (7) close to the liquid outlet (202). The check groove (15) is arc-shaped, and the opening of the arc-shaped check groove (15) faces the liquid outlet (202).

7. The valveless piezoelectric pump with a guide column structure according to claim 1, characterized in that: The pump further comprises two sealing rings (16), which are respectively located on both sides of the piezoelectric vibrator (3). When the piezoelectric vibrator (3) is installed between the pump body (2) and the pump cover (1), the two sealing rings (16) are respectively in contact with the pump body (2) and the pump cover (1).

8. The valveless piezoelectric pump with a guide column structure according to claim 7, characterized in that: The pump body (2) and the pump cover (1) are both provided with positioning grooves (17), and the two sealing rings (16) are respectively located in the positioning grooves (17) on the pump body (2) and the positioning grooves (17) on the pump cover (1).

9. The valveless piezoelectric pump with a guide column structure according to claim 1, characterized in that: The pump cover (1) and the pump body (2) are both provided with positioning holes for the bolt (19) to pass through. The positioning hole on the pump cover (1) and the positioning hole on the pump body (2) are coaxial. A nut (20) is also sleeved on the bolt (19).

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