CN216077466U - Liquid pump and unmanned aerial vehicle - Google Patents

Abstract

The utility model provides a liquid pump and unmanned aerial vehicle, the liquid pump includes the pump body and piezoelectric actuator, the pump body includes the pump case, be formed with on the pump case and be used for the inlet that communicates with the inlet channel and be used for the outlet port that communicates with the outlet channel, be formed with first runner, second runner and sap cavity in the pump case, the first port of first runner communicates with the inlet, the second port of first runner communicates with the sap cavity, the first port of second runner communicates with the sap cavity, the second port of second runner communicates with the outlet port, first runner and second runner all extend along the direction perpendicular with the thickness direction of pump body, along the direction from the first port of first runner to the second port of first runner, the through-flow area of first runner increases gradually, along the direction from the first port of second runner to the second port of second runner, the through-flow area of second runner increases gradually, the piezoelectric driver is arranged on the pump shell and used for generating reciprocating vibration under the action of alternating current so as to increase or decrease the volume of the liquid cavity.

Description

Liquid pump and unmanned aerial vehicle

Technical Field

The utility model relates to a fluid pumping equipment technical field specifically, relates to a liquid pump and unmanned aerial vehicle.

Background

Along with electronic device such as calculation processing unit or module performance's continuous promotion, unmanned aerial vehicle faces more and more severe heat dissipation risk, and a large amount of heats can make components and parts work in higher temperature, seriously threatens unmanned aerial vehicle's reliability and performance. As the liquid cooling heat dissipation in the forced convection heat transfer, the liquid pump is a common liquid flow driving device, but most of the existing liquid pumps are electromagnetically driven, the weight of the electromagnetic pump is large, and electromagnetic interference generated in the working process of the electromagnetic pump can bring large influence to the communication functional component of the unmanned aerial vehicle, so that the degradation of the performance of modules such as the positioning precision and data transmission of the unmanned aerial vehicle is caused.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a liquid pump and unmanned aerial vehicle to solve the relevant problem that exists among the prior art.

In order to achieve the above object, the present disclosure provides a liquid pump including:

the pump body comprises a pump shell, a liquid inlet communicated with the liquid inlet pipeline and a liquid outlet communicated with the liquid outlet pipeline are formed on the pump shell, a first flow passage, a second flow passage and a liquid cavity are formed in the pump shell, a first port of the first flow passage is communicated with the liquid inlet, the second port of the first flow passage is communicated with the liquid cavity, the first port of the second flow passage is communicated with the liquid cavity, a second port of the second flow passage is communicated with the liquid outlet, the first flow passage and the second flow passage both extend in a direction perpendicular to the thickness direction of the pump body and in a direction from the first port of the first flow passage to the second port of the first flow passage, the flow area of the first flow passage is gradually increased, and the flow area of the second flow passage is gradually increased along the direction from the first port of the second flow passage to the second port of the second flow passage;

and the piezoelectric driver is arranged on the pump shell and used for generating reciprocating vibration under the action of alternating current so as to increase or decrease the volume of the liquid cavity.

Optionally, the pump case includes a first casing and a second casing that are disposed along a thickness direction of the pump body, the liquid inlet is formed on the first casing, the first flow channel is formed in the first casing, the liquid outlet is formed on the second casing, the second flow channel and the liquid cavity are both formed in the second casing, the piezoelectric driver is disposed on the second casing, the first flow channel is plural, the first flow channel is disposed around the liquid inlet along a circumferential direction of the first casing, the second flow channel is plural, the second flow channel is disposed around the liquid cavity along a circumferential direction of the second casing, a gap is provided between the first casing and the second casing, and a second port of the first flow channel is communicated with the liquid cavity through the gap.

Optionally, the first housing includes a first end plate and a first sealing plate which are oppositely arranged in the thickness direction of the pump body, the liquid inlet is formed on the first end plate, a plurality of first protrusions are arranged between the first end plate and the first sealing plate, the plurality of first protrusions are arranged around the liquid inlet along the circumferential direction of the first housing, and every two adjacent first protrusions, the first end plate and the first sealing plate define the first flow channel together;

the second casing comprises a second end plate and a second sealing plate which are oppositely arranged in the thickness direction of the pump body, the second sealing plate is located between the first sealing plate and the second end plate, the liquid outlet is formed in the second end plate, the piezoelectric driver is arranged on the second end plate, a plurality of second convex blocks are arranged between the second end plate and the second sealing plate and are arranged at intervals in the circumferential direction of the second casing, one end, close to the central axis of the second casing, of the plurality of second convex blocks and the second end plate and the second sealing plate jointly define the liquid cavity, and every two adjacent second convex blocks, the second end plate and the second sealing plate jointly define the second flow channel;

the first end plate is connected with the second sealing plate, the gap is formed between the first sealing plate and the second sealing plate, and a through hole which is communicated with the gap and the liquid cavity is formed in the second sealing plate.

Optionally, a first annular liquid collecting groove with an opening facing the second sealing plate is formed in the first end plate, the first annular liquid collecting groove is located on the outer side of the first sealing plate, the first flow channel is located between the first annular liquid collecting groove and the liquid inlet, and both the second port of the first flow channel and the gap are communicated with the first annular liquid collecting groove;

a second annular liquid collecting groove with an opening facing the second sealing plate is formed in the second end plate, the second flow channel is located between the second annular liquid collecting groove and the liquid cavity, and a second port of the second flow channel and the liquid outlet are both communicated with the second annular liquid collecting groove;

the second shrouding is towards one side of first annular collecting tank is formed with first location arch, the second shrouding is towards one side of second annular collecting tank is formed with the second location arch, first location arch with the second location arch respectively with first annular collecting tank with the cooperation of second annular collecting tank.

Optionally, a first annular liquid collecting groove is formed in the first shell, the first flow channel is located between the first annular liquid collecting groove and the liquid inlet, and the second port of the first flow channel and the gap are both communicated with the first annular liquid collecting groove;

and a second annular liquid collecting groove is formed in the second shell, the second flow channel is positioned between the second annular liquid collecting groove and the liquid cavity, and a second port of the second flow channel and the liquid outlet are communicated with the second annular liquid collecting groove.

Optionally, a groove is formed in the pump shell, the liquid cavity and the piezoelectric driver are respectively located on two sides of the bottom wall of the groove, the piezoelectric driver is connected to the bottom wall of the groove, and the piezoelectric driver can drive the bottom wall of the groove to deform during reciprocating vibration so as to increase or decrease the volume of the liquid cavity.

Optionally, a weakening groove is formed at the joint of the bottom wall of the groove and the side wall of the groove.

Optionally, the piezoelectric driver includes an amplitude transformer and a piezoelectric patch, the piezoelectric patch is configured to generate reciprocating vibration under the action of alternating current, the amplitude transformer has a large head end and a small head end, an outer diameter of the large head end is greater than an outer diameter of the small head end, the piezoelectric patch is disposed at the large head end, and the small head end is connected to the pump housing.

Optionally, the number of the pump bodies is two, the number of the amplitude transformer is two, the number of the piezoelectric patches is multiple, the piezoelectric driver further comprises a connecting shaft, two ends of the connecting shaft are respectively connected with the two amplitude transformers, and the piezoelectric patches are sleeved on the connecting shaft and clamped between the two amplitude transformers.

The utility model also provides an unmanned aerial vehicle, including foretell liquid pump.

Through the technical scheme, the liquid pump drives the volume of the liquid cavity to increase or decrease through the piezoelectric driver, and liquid pressure difference is generated between the pump body and the external liquid inlet pipeline and the external liquid outlet pipeline, so that liquid can enter or flow out of the pump body, because the flow areas of the first flow passage and the second flow passage are gradually increased along the direction from the first port to the second port, the liquid flow resistance is different when the liquid enters or flows out of the pump body from the first flow passage and the second flow passage, so that in the whole processes of liquid suction and liquid discharge, the liquid in the liquid inlet pipeline can enter the liquid cavity through the first flow channel, the liquid in the liquid cavity can flow out to the liquid outlet pipeline through the second flow channel, the amount of liquid which flows back from the liquid cavity to the liquid inlet pipeline and from the liquid outlet pipeline to the liquid cavity is small, so that the function that the liquid pump can pump the liquid in a one-way mode is achieved. Because the liquid pump that this disclosure provided is the volume that relies on piezoelectric actuator's vibration to change the sap cavity, thereby cause pressure differential to come the pump sending liquid, compare with the liquid pump that adopts electromagnetic drive among the prior art, its working process can not produce electromagnetic interference, and piezoelectric actuator's quality is compared the quality of the electromagnetic drive mechanism in traditional electromagnetic pump littleer, therefore, when the liquid pump that this disclosure provides is applied to unmanned aerial vehicle, can not bring great influence to unmanned aerial vehicle's communication function part, guarantee unmanned aerial vehicle positioning accuracy, reliability and stability of data transmission etc., the whole quality of liquid pump is littleer simultaneously, thereby it guarantees its duration to reduce unmanned aerial vehicle's heavy burden.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

FIG. 1 is a perspective view of a liquid pump provided in accordance with an exemplary embodiment of the present disclosure;

FIG. 2 is an exploded view of a liquid pump provided in accordance with an exemplary embodiment of the present disclosure;

FIG. 3 is an exploded view (from a different perspective than FIG. 2) of a liquid pump provided in an exemplary embodiment of the present disclosure;

FIG. 4 is a top plan view of a first end plate of a liquid pump provided in accordance with an exemplary embodiment of the present disclosure;

FIG. 5 is a top view of a second end plate of a liquid pump provided in accordance with an exemplary embodiment of the present disclosure;

FIG. 6 is a top view of a liquid pump provided in an exemplary embodiment of the present disclosure;

FIG. 7 is a cross-sectional view taken along line "A-A" of FIG. 6, with arrows illustrating exemplary fluid flow paths as the volume of the fluid chamber is increased by the piezoelectric driver;

FIG. 8 is a cross-sectional view taken along line "A-A" in FIG. 6, with arrows illustrating exemplary fluid flow paths as the piezoelectric driver drives the volume of the fluid chamber to decrease;

FIG. 9 is a sectional view taken along line "A-A" in FIG. 6, wherein the arrows schematically illustrate the liquid flow path of the liquid pump during the entire cycle of intake and output;

FIG. 10 is an enlarged view of portion "B" of FIG. 9;

FIG. 11 is a front view of a liquid pump provided in accordance with another exemplary embodiment of the present disclosure;

fig. 12 is a sectional view taken along the line "C-C" in fig. 11.

Description of the reference numerals

1-a pump body; 10-a pump housing; 11-a liquid inlet; 12-a liquid outlet; 13-a first flow channel; 14-a second flow channel; 15-a liquid chamber; 16-a first housing; 161-a first end plate; 1611-a first annular sump; 162-a first closure plate; 163-first bump; 17-a second housing; 171-a second end plate; 1711-a second annular sump; 172-a second seal plate; 1721-a first locating boss; 1722-a second locating protrusion; 1723-a through hole; 173-second bump; 174-groove; 1741-a bottom wall; 1742-weakening groove; 1743-side wall; 18-clearance; 19-mounting ears; 2-a piezoelectric actuator; 21-a horn; 211-big head end; 212-small head end; 22-a piezoelectric sheet; 23-a connecting shaft; 24-positive electrode tab; 25-grounding the electrode piece; 31-a liquid inlet pipeline; 32-liquid outlet pipeline.

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

In the present disclosure, unless otherwise specified, the use of an orientation word such as "thickness direction" means the thickness direction as shown in fig. 1, and "inner and outer" means inner and outer with respect to the contour of the component or structure itself. In addition, it should be noted that terms such as "first", "second", and the like are used for distinguishing one element from another, and have no order or importance. In addition, in the description with reference to the drawings, the same reference numerals in different drawings denote the same elements.

According to an aspect of the present disclosure, as shown in fig. 1 to 12, the present disclosure provides a liquid pump including a pump body 1 and a piezoelectric driver 2, the pump body 1 includes a pump housing 10, the pump housing 10 is formed with an inlet 11 for communicating with an inlet pipe 31 and an outlet 12 for communicating with an outlet pipe 32, the pump housing 10 is formed with a first flow passage 13, a second flow passage 14, and a liquid chamber 15, a first port of the first flow passage 13 is communicated with the inlet 11, a second port of the first flow passage 13 is communicated with the liquid chamber 15, a first port of the second flow passage 14 is communicated with the liquid chamber 15, a second port of the second flow passage 14 is communicated with the liquid chamber 12, the first flow passage 13 and the second flow passage 14 both extend in a direction perpendicular to a thickness direction of the pump body 1, a flow area of the first flow passage 13 gradually increases in a direction from the first port of the first flow passage 13 to the second port of the first flow passage 13 (as shown in fig. 4), the flow area of the second flow passage 14 gradually increases in a direction from the first port of the second flow passage 14 to the second port of the second flow passage 14 (as shown in fig. 5). A piezoelectric actuator 2 is provided on the pump housing 10, the piezoelectric actuator 2 being adapted to generate reciprocating vibrations under the action of an alternating current to increase or decrease the volume of the fluid chamber 15.

Here, the piezoelectric actuator 2 refers to an element that can output displacement or vibration by using the "inverse piezoelectric effect". For example, the piezoelectric actuator 2 may include a piezoelectric sheet, and the piezoelectric sheet may include a piezoelectric ceramic and conductor electrodes, and the conductor electrodes are added to two poles of the polarized piezoelectric ceramic, and when an ac signal is connected to the two conductor electrodes, the piezoelectric sheet deforms correspondingly according to the voltage and frequency of the signal, and outputs corresponding vibration.

In the liquid pump described above, since the flow area of the first flow path 13 gradually increases in the direction from the first port to the second port, the fluid resistance that the liquid receives when flowing through the first port of the first flow path 13 to the second port thereof is smaller than the fluid resistance that the liquid receives when flowing through the second port thereof to the first port thereof, and similarly, the fluid resistance that the liquid receives when flowing through the first port of the second flow path 14 to the second port thereof is smaller than the fluid resistance that the liquid receives when flowing through the second port thereof to the first port thereof.

When the liquid pump is used for pumping liquid, the piezoelectric driver 2 on the pump shell 10 can generate reciprocating vibration under the action of alternating current, so that the volume of the liquid cavity 15 is increased or reduced. When the volume of the liquid chamber 15 is increased by the piezoelectric driver 2, as shown in fig. 7, the arrow in fig. 7 exemplarily shows the flowing direction of the liquid, and the liquid in the liquid inlet pipe 31 flows into the liquid chamber 15 through the first flow channel 13 under the action of the liquid pressure difference due to the decrease of the liquid pressure inside the liquid chamber 15, that is, the pump body 1 performs the "liquid sucking" process. Meanwhile, since the second flow channel 14 is also communicated with the liquid chamber 15, when the hydraulic pressure in the liquid chamber 15 is reduced, the liquid in the liquid outlet pipe 32 also flows back into the liquid inlet chamber 15 through the second flow channel 14, but since the flow resistance of the liquid flowing from the second port of the second flow channel 14 to the first port thereof is large, the flow rate of the liquid flowing back into the liquid chamber 15 through the second flow channel 14 is small. Thus, in the "pipetting" process described above, liquid enters the liquid chamber 15 mainly through the first flow channel 13.

When the volume of the liquid chamber 15 is reduced by the piezoelectric driver 2, as shown in fig. 8, the arrow in fig. 8 exemplarily shows the flowing direction of the liquid, and the liquid in the liquid chamber 15 flows to the liquid outlet pipe 32 through the second flow channel 14 under the action of the pressure difference due to the increase of the hydraulic pressure inside the liquid chamber 15, i.e. the "liquid outlet" process is performed. Meanwhile, since the liquid chamber 15 is communicated with the first flow channel 13, the liquid in the liquid chamber 15 will also flow to the liquid inlet pipe 31 through the first flow channel 13, but since the flow resistance of the liquid flowing from the second port of the first flow channel 13 to the first port thereof is large, the flow rate of the liquid flowing back to the liquid inlet pipe 31 through the first flow channel 13 is small. Therefore, during this "tapping", the liquid in the liquid chamber 15 mainly flows to the tapping pipe 32 through the second flow channel 14.

That is, in the "liquid suction" process, the liquid in the liquid inlet pipe 31 flows from the first port of the first flow channel 13 to the second port thereof with small flow resistance, and in the "liquid discharge" process, the liquid in the liquid chamber 15 flows back to the first port thereof through the second port of the first flow channel 13 with large flow resistance. Therefore, after the liquid pump performs the "liquid sucking" and "liquid discharging" processes once, the flow rate of the liquid entering the liquid chamber 15 through the first flow passage 13 is larger than the flow rate of the liquid returning to the liquid inlet pipe 31 through the first flow passage 13. Similarly, after the liquid pump performs the "liquid sucking" and "liquid discharging" processes, the flow rate of the liquid flowing out of the liquid chamber 15 through the second flow passage 14 is larger than the flow rate of the liquid flowing back into the liquid chamber 15 through the second flow passage 14. Therefore, when the piezoelectric driver 2 generates reciprocating vibration under the action of the alternating current to drive the liquid pump to continuously and repeatedly perform the processes of "liquid suction" and "liquid discharge", as shown in fig. 9, the liquid pump pumps the liquid in the general flowing direction: the liquid in the liquid inlet pipe 31 enters the liquid cavity 15 through the first flow passage 13, and the liquid in the liquid cavity 15 enters the liquid outlet pipe 32 through the second flow passage 14, so that the 'one-way' pumping of the liquid is realized.

By the technical scheme, the liquid pump drives the volume of the liquid cavity 15 to increase or decrease through the piezoelectric driver 2, and a liquid pressure difference is generated between the pump body 1 and the external liquid inlet pipeline 31 and the external liquid outlet pipeline 32, so that liquid can enter or flow out of the pump body 1, because the flow areas of the first flow channel 13 and the second flow channel 14 are gradually increased along the direction from the first port to the second port thereof, the liquid in the liquid inlet pipeline 31 can enter the liquid cavity 15 through the first flow channel 13 in the whole liquid suction and liquid outlet processes by utilizing the difference of flow resistance of the liquid entering or flowing out of the pump body 1 from the first flow channel 13 and the second flow channel 14, the liquid in the liquid cavity 15 can flow out to the liquid outlet pipeline 32 through the second flow channel 14, and the amount of the liquid flowing back from the liquid cavity 15 to the liquid inlet pipeline 31 and the amount of the liquid flowing back from the liquid outlet pipeline 32 to the liquid cavity 15 are very small, thereby realizing the function that the liquid pump can pump the liquid in a one-way. Because the liquid pump that this disclosure provided relies on 2 vibrations of piezoelectric actuator to change the volume of liquid chamber 15, thereby cause pressure differential to come the pump sending liquid, compare with the liquid pump that adopts electromagnetic drive among the prior art, its working process can not produce electromagnetic interference, and piezoelectric actuator 2's quality is compared the quality of the electromagnetic drive mechanism in traditional electromagnetic pump littleer, therefore, when the liquid pump that this disclosure provided is used to unmanned aerial vehicle, can not bring great influence to unmanned aerial vehicle's communication function part, guarantee unmanned aerial vehicle positioning accuracy, the reliability and the stability of data transmission etc., the whole quality of liquid pump is littleer simultaneously, thereby it guarantees its duration to reduce unmanned aerial vehicle's heavy burden.

Further, since both the first flow passage 13 and the second flow passage 14 extend in the direction perpendicular to the thickness direction of the pump body 1, the size of the pump body 1 in the thickness direction can be reduced, so that the piezoelectric actuator 2 is compact in structure. Because unmanned aerial vehicle's volume is less, the space of installation liquid pump on the unmanned aerial vehicle is limited, and the size of the liquid pump that this disclosure provided is less in thickness direction, and compact structure can reduce the dimensional requirement to the installation space on the unmanned aerial vehicle when using to unmanned aerial vehicle.

Optionally, the above-mentioned liquid pump can be used on unmanned aerial vehicle, also can use in arbitrary liquid circulation system, for example liquid cooling system of robot etc. this disclosure does not do specific restriction to the use scene of liquid pump. When the liquid pump provided by the present disclosure is specifically applied to an unmanned aerial vehicle, optionally, the diameter of the liquid pump may be less than 30mm, the thickness may be less than 5mm, and the weight may be within 10 g. In addition, the liquid pump can be used alone, or a plurality of liquid pumps can be arranged in series on the liquid circulation path.

In the liquid pump described above, since the liquid is subjected to different fluid resistances when entering or exiting the pump body 1 from the first flow passage 13 and the second flow passage 14, a flow difference is generated when the liquid passes between the liquid inlet 11 and the liquid outlet 12, and a unidirectional flow of the liquid is realized. Therefore, in order to improve the pumping efficiency of the liquid pump, the fluid resistance to which the liquid flows in the direction from the second port to the first port can be further increased to improve the difference in flow rate per unit time when the liquid flows through the first flow passage 13 and the second flow passage 14. Alternatively, by increasing the number of the first flow passages 13 and the second flow passages 14, the liquid can simultaneously enter or exit the pump body 1 through the plurality of first flow passages 13 and the plurality of second flow passages 14, thereby improving the overall pumping efficiency of the liquid pump.

As an exemplary embodiment, as shown in fig. 2 and 3, the pump housing 10 may include a first housing 16 and a second housing 17 which are oppositely disposed in a thickness direction of the pump body 1, the liquid inlet 11 may be formed on the first housing 16, the first flow passage 13 is formed in the first housing 16, the liquid outlet 12 is formed on the second housing 17, the second flow passage 14 and the liquid chamber 15 are both formed in the second housing 17, the piezoelectric driver 2 is disposed on the second housing 17, the first flow passage 13 is plural, the plural first flow passages 13 are disposed around the liquid inlet 11 in a circumferential direction of the first housing 16, the plural second flow passages 14 are plural, the plural second flow passages 14 are disposed around the liquid chamber 15 in a circumferential direction of the second housing 17, a gap 18 is provided between the first housing 16 and the second housing 17, and a second port of the first flow passage 13 communicates with the liquid chamber 15 through the gap 18.

In the process of driving the liquid pump to absorb liquid and discharge liquid once by the piezoelectric driver 2, because the plurality of first flow channels 13 and the plurality of second flow channels 14 are arranged at the same time, liquid can enter the liquid cavity 15 through the plurality of first flow channels 13 and flow out through the plurality of second flow channels 14, the flow difference of the liquid flowing through the first flow channels 13 and the second flow channels 14 is increased, and the liquid pumping efficiency of the liquid pump is improved. Moreover, the plurality of first flow channels 13 are arranged around the liquid inlet 11 along the circumferential direction of the first shell 16, the plurality of second flow channels 14 are arranged around the liquid cavity 15 along the circumferential direction of the second shell 17, the gap 18 is connected between the liquid cavity 15 and the second port of the first flow channel 13, the flowing direction of the liquid can be guided, the flowing direction of the liquid can be changed through the gap 18 after the liquid flows out from the second port of the first flow channel 13, and therefore the liquid can enter the first port of the second flow channel 14 through the liquid cavity 15. In such an embodiment, the gap 18 between the first housing 16 and the second housing 17 serves as a flow passage for the liquid, which can simplify the internal structure of the liquid pump, and make the arrangement of the first flow passage 13 and the second flow passage 14 in the thickness direction of the pump body 1 more compact, ensuring a smaller volume of the liquid pump while improving the efficiency of pumping the liquid.

Since the plurality of first flow channels 13 are disposed around the liquid inlet 11 along the circumferential direction of the first housing 16, that is, the second ports of the plurality of first flow channels 13 are also distributed around the circumferential direction of the liquid inlet 11, in order to facilitate the liquid of the plurality of first flow channels 13 to enter or exit the liquid chamber 15, optionally, a first annular liquid collecting groove 1611 may be formed on the first housing 16, the first flow channels 13 are located between the first annular liquid collecting groove 1611 and the liquid inlet 11, the second ports of the first flow channels 13 and the gap 18 are both communicated with the first annular liquid collecting groove 1611, and the liquid in the first flow channels 13 flows into the first annular liquid collecting groove 1611 through the second ports and is communicated with the liquid chamber 15 through the gap 18. Likewise, optionally, a second annular sump 1711 may be formed in the second housing 17, the second flow passage 14 may be located between the second annular sump 1711 and the liquid chamber 15, and the second port and the liquid outlet 12 of the second flow passage 14 may both communicate with the second annular sump 1711.

The first flow channel 13 and the second flow channel 14 may be separately formed pipelines, as an exemplary embodiment, the pump body 1 may include a plurality of pipelines with inner diameters gradually expanding along the axial direction, the plurality of pipelines are disposed around the liquid inlet 11 along the circumferential direction of the first housing 16, the inside of the pipeline is the first flow channel 13, similarly, the plurality of pipelines are disposed around the liquid cavity 15 along the circumferential direction of the second housing 17, the inside of the pipeline is the second flow channel 14, and the pipeline may be fixed inside the pump housing 10 by bonding or welding.

As another exemplary embodiment, as shown in fig. 2 to 5, the first housing 16 may include a first end plate 161 and a first cover plate 162 that are oppositely disposed in a thickness direction of the pump body 1, the liquid inlet 11 may be formed on the first end plate 161, a plurality of first protrusions 163 are disposed between the first end plate 161 and the first cover plate 162, the plurality of first protrusions 163 are disposed around the liquid inlet 11 along a circumferential direction of the first housing 16, and each adjacent two first protrusions 163 define the first flow channel 13 together with the first end plate 161 and the first cover plate 162; the second housing 17 may include a second end plate 171 and a second sealing plate 172 which are oppositely arranged in the thickness direction of the pump body 1, the second sealing plate 172 is located between the first sealing plate 162 and the second end plate 171, the liquid outlet 12 is formed on the second end plate 171, the piezoelectric actuator 2 is arranged on the second end plate 171, a plurality of second protrusions 173 are arranged between the second end plate 171 and the second sealing plate 172, the plurality of second protrusions 173 are arranged at intervals along the circumferential direction of the second housing 17, one end of the plurality of second protrusions 173 close to the central axis of the second housing 17 defines the liquid cavity 15 together with the second end plate 171 and the second sealing plate 172, and every two adjacent second protrusions 173 define the second flow channel 14 together with the second end plate 171 and the second sealing plate 172; the first end plate 161 is connected to the second cover plate 172, a gap 18 is formed between the first cover plate 162 and the second cover plate 172, and a through hole for communicating the gap 18 with the liquid chamber 15 is formed in the second cover plate 172.

In the above-described embodiment, as shown in fig. 4, the plurality of first projections 163 are arranged around the liquid inlet 11 in the circumferential direction of the first housing 16, and the distance between every two adjacent first projections 163 gradually increases as the first projections 163 extend in the direction from the center of the first end plate 161 to the outer periphery thereof, so that the flow area of the first flow channel 13 gradually increases from the first port to the second port. The cross section of the first protrusion 163 may be formed in a trapezoid shape having a side length near the second port larger than that near the first port, or a triangle shape having a sharp corner near the first port, and by adjusting the specific shape of the first protrusion 163, the flow resistance of the liquid passing through the first flow channel 13 may be adjusted, thereby adjusting the pumping efficiency of the liquid pump. Similarly, the flow resistance of the second flow channel 14 can be adjusted by adjusting the specific shape of the second protrusion 173. The present disclosure does not limit the specific shapes of the first bump 163 and the second bump 173.

In the above embodiment, one end of the second protrusions 173 close to the central axis of the second housing 17, together with the second end plate 171 and the second sealing plate 172, defines the liquid chamber 15, the piezoelectric actuator 2 is disposed on the second end plate 171, that is, the piezoelectric actuator 2 is located outside the liquid chamber 15, the piezoelectric actuator 2 does not belong to a part of the liquid chamber 15, and the vibration of the piezoelectric actuator 2 acts on the chamber wall of the liquid chamber 15 to deform the chamber wall of the liquid chamber 15, so as to increase or decrease the volume of the liquid chamber 15. In other embodiments, the piezoelectric actuator 2 may also be directly used as a structural part of the liquid chamber 15, for example, one end of the second protrusions 173 close to the central axis of the second housing 17 defines the liquid chamber 15 together with the piezoelectric actuator 2 and the second cover plate 172, that is, a part of the chamber wall of the liquid chamber 15 is the piezoelectric actuator 2, so as to change the volume in the liquid chamber 15 through the deformation of the piezoelectric sheet itself. In embodiments where a portion of the chamber wall of the fluid chamber 15 is the piezoelectric actuator 2, the piezoelectric actuator 2 may be insulated from the fluid inside the fluid chamber 15 by an insulating member.

Alternatively, the pump body 1 of the liquid pump may be integrally formed (for example, integrally formed by 3D printing technology), that is, the first housing 16 and the second housing 17 may be integrally formed respectively, or the first housing 16 and the second housing 17 may be integrally formed together. Alternatively, the first end plate 161, the first cover plate 162, the second cover plate and the second end plate 171 may be fixedly connected by welding, gluing, or fastening. The present disclosure is not limited to a specific formation manner of the pump body 1.

Alternatively, as shown in fig. 2, 3 and 9, the first end plate 161 may be formed with a first annular sump 1611 opening towards the second cover plate 172, the first annular sump 1611 being located outside the first cover plate 162, the first flow channel 13 being located between the first annular sump 1611 and the inlet port 11, the second port of the first flow channel 13 and the gap 18 both communicating with the first annular sump 1611; the second end plate 171 is provided with a second annular liquid collecting groove 1711 with an opening facing the second sealing plate 172, the second flow channel 14 is positioned between the second annular liquid collecting groove 1711 and the liquid cavity 15, and a second port and a liquid outlet 12 of the second flow channel 14 are both communicated with the second annular liquid collecting groove 1711; a first locating protrusion 1721 is formed on one side of the second sealing plate 172 facing the first annular sump 1611, a second locating protrusion 1722 is formed on one side of the second sealing plate 172 facing the second annular sump 1711, and the first locating protrusion 1721 and the second locating protrusion 1722 are respectively fitted with the first annular sump 1611 and the second annular sump 1711.

When the pump body 1 is installed, as shown in fig. 2 and 9, the inner wall of the first annular liquid collecting groove 1611 can abut against the outside of the first positioning protrusion 1721, so that the first end plate 161 and the second sealing plate 172 can be accurately abutted, and the problems of liquid leakage and the like caused by a gap between the first end plate 161 and the second sealing plate 172 are prevented. Similarly, as shown in fig. 3, the inner portion of the second annular liquid collecting groove 1711 can be clamped on the outer portion of the second positioning protrusion 1722, so as to ensure the connection tightness between the second end plate 171 and the second sealing plate 172. The first end plate 161 and the second cover plate 172, and the second end plate 171 and the second cover plate 172 may be fixed by ultrasonic welding or gluing, and the like, which is not limited in this disclosure.

Since the piezoelectric actuator 2 is connected to the pump housing 10, in order to facilitate the piezoelectric actuator 2 to drive the volume of the liquid chamber 15 to change, optionally, as shown in fig. 2 and 10, a recess 174 may be formed on the pump housing 10, the liquid chamber 15 and the piezoelectric actuator 2 are respectively located on both sides of a bottom wall 1741 of the recess 174, and the piezoelectric actuator 2 may be connected to the bottom wall 1741 of the recess 174. Since the recess 174 is formed in the pump housing 10, the thickness of the bottom wall 1741 in the recess 174 is smaller than the thickness of the bottom wall 1741 at other positions of the pump housing 10, and the driving force of the piezoelectric driver 2 acts on the bottom wall 1741 of the recess 174, so that the bottom wall 1741 is largely deformed, thereby increasing or decreasing the volume of the liquid chamber 15, and causing the liquid pressure inside the liquid chamber 15 to change.

In the embodiment including the second end plate 171 and the second cover plate 172, one end of the second protrusions 173 near the central axis of the second housing 17 and the second end plate 171 and the second cover plate 172 together define the liquid chamber 15, the recess 174 may be formed on the side of the second end plate 171 opposite to the liquid chamber 15, as shown in fig. 2, the thickness of the bottom wall 1741 in the recess 174 is smaller than the thickness of the second end plate 171 at other positions, the driving force of the piezoelectric driver 2 acts on the bottom wall 1741 of the recess 174, so that the bottom wall 1741 is largely deformed, the bottom wall 1742 is compressed into the liquid chamber 15 or expanded out of the second end plate 171, and the volume in the liquid chamber 15 is reduced or increased, so that the liquid pressure in the liquid chamber 15 is changed.

In the above embodiment, in order to ensure that the bottom wall 1741 of the recess 174 can be largely deformed, optionally, as shown in fig. 10, a weakening groove 1742 may be formed at the junction of the bottom wall 1741 of the recess 174 and the side wall of the recess 174. Since the bottom wall of the weakening groove 1742 has a smaller thickness than the bottom wall of the bottom wall 1741 of the recess 174, after receiving the acting force of the piezoelectric driver 2, the bottom wall 1741 of the recess 174 transmits the acting force to the bottom wall of the weakening groove 1742, so that the bottom wall of the weakening groove 1742 is greatly deformed, thereby increasing the volume change of the liquid cavity 15 and improving the liquid pumping efficiency. Meanwhile, since the bottom wall 1741 of the recess 174 can disperse the acting force toward the bottom wall of the weakening groove 1742, the pump body 1 is prevented from being broken down or the like due to stress concentration.

Alternatively, the liquid pump may be mounted (for example, on the drone) by welding, bonding, or bolting, in an embodiment using bolting, in order to facilitate mounting of the liquid pump, as shown in fig. 6, a mounting ear 19 may be further provided on the pump body 1, a mounting hole for passing a bolt is formed on the mounting ear 19, and a connecting bolt may pass through the mounting hole and be connected with a threaded hole on the drone, so as to detachably mount the liquid pump on other structures (for example, the drone). In embodiments where the pump housing 10 includes a second closure plate 172, the mounting ears 19 may be formed on the second closure plate 172.

Alternatively, in one embodiment, the piezoelectric actuator 2 may include a piezoelectric patch 22, the piezoelectric patch 22 being directly connected to the pump housing 10 to cause a change in volume of the fluid chamber 15.

In another embodiment, in order to improve the driving force of the piezoelectric actuator 2, as shown in fig. 11 and 12, the piezoelectric actuator 2 may include an amplitude transformer 21 and a piezoelectric sheet 22, the piezoelectric sheet 22 is configured to generate a reciprocating vibration under the action of an alternating current, the amplitude transformer 21 has a large head end 211 and a small head end 212, the outer diameter of the large head end 211 is larger than that of the small head section, the piezoelectric sheet 22 is disposed at the large head end 211, and the small head end 212 is connected to the pump housing 10. Because the outer diameter of the small end 212 of the amplitude transformer 21, which is in contact with the pump shell 10, is smaller than the outer diameter of the large end 211 of the amplitude transformer 21, which is in contact with the piezoelectric patch 22, the driving force generated by the piezoelectric patch 22 can be transmitted to the pump shell 10 more intensively through the amplitude transformer 21, so that the pump shell 10 can generate larger deformation, the change of the volume of the liquid cavity 15 is improved, and the liquid pumping efficiency is improved.

To improve the pumping efficiency, the liquid pump may comprise a plurality of pump bodies 1. For example, as shown in fig. 11 and 12, the number of the pump body 1 may be two, the number of the amplitude rods 21 may be two, the number of the piezoelectric sheets 22 may be multiple, the piezoelectric driver 2 further includes a connecting shaft 23, two ends of the connecting shaft 23 are respectively connected to the two amplitude rods 21, and the multiple piezoelectric sheets 22 are sleeved on the connecting shaft 23 and clamped between the two amplitude rods 21. Since the plurality of piezoelectric patches 22 are sleeved on the connecting shaft 23, the deformation thereof can be overlapped with each other, and the driving force is transmitted to the pump body 1 through the amplitude transformer 21 positioned at both ends, so that the deformation of the piezoelectric patches 22 can be fully utilized, thereby avoiding the waste of the driving force. Meanwhile, the amount of deformation applied to the pump body by the amplitude transformer 21 can be controlled by increasing or decreasing the number of the piezoelectric sheets 22 sleeved on the connecting shaft 23, so that the driving efficiency of the liquid pump is effectively controlled.

Alternatively, as shown in fig. 12, a positive electrode plate 24 may be disposed between two adjacent piezoelectric plates 22 in the plurality of piezoelectric plates 22, and a ground electrode plate 25 may be disposed between the piezoelectric plate 22 closest to the large head end 211 of the horn 21 and the large head end 211 of the horn 21, so that the plurality of piezoelectric plates 22 can be subjected to the alternating current.

According to another aspect of the present disclosure, the present disclosure also provides a drone including the liquid pump described above.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims (10)

1. A liquid pump, comprising:

the pump body (1) comprises a pump shell (10), wherein a liquid inlet (11) communicated with a liquid inlet pipeline (31) and a liquid outlet (12) communicated with a liquid outlet pipeline (32) are formed in the pump shell (10), a first flow channel (13), a second flow channel (14) and a liquid cavity (15) are formed in the pump shell (10), a first port of the first flow channel (13) is communicated with the liquid inlet (11), a second port of the first flow channel (13) is communicated with the liquid cavity (15), a first port of the second flow channel (14) is communicated with the liquid cavity (15), a second port of the second flow channel (14) is communicated with the liquid outlet (12), the first flow channel (13) and the second flow channel (14) both extend along a direction perpendicular to the thickness direction of the pump body (1) and along a direction from the first port of the first flow channel (13) to the second port of the first flow channel (13), the flow area of the first flow passage (13) gradually increases, the flow area of the second flow passage (14) gradually increases in a direction from the first port of the second flow passage (14) to the second port of the second flow passage (14),

the piezoelectric driver (2) is arranged on the pump shell (10), and the piezoelectric driver (2) is used for generating reciprocating vibration under the action of alternating current so as to increase or decrease the volume of the liquid cavity (15).

2. A liquid pump according to claim 1, wherein the pump housing (10) includes a first housing (16) and a second housing (17) that are disposed opposite to each other in a thickness direction of the pump body (1), the liquid inlet (11) is formed in the first housing (16), the first flow passage (13) is formed in the first housing (16), the liquid outlet (12) is formed in the second housing (17), the second flow passage (14) and the liquid chamber (15) are both formed in the second housing (17), and the piezoelectric driver (2) is disposed in the second housing (17);

the first flow channel (13) is multiple, the first flow channel (13) is arranged around the liquid inlet (11) along the circumferential direction of the first shell (16), the second flow channel (14) is multiple, the second flow channel (14) is arranged around the liquid cavity (15) along the circumferential direction of the second shell (17), a gap (18) is formed between the first shell (16) and the second shell (17), and the second port of the first flow channel (13) is communicated with the liquid cavity (15) through the gap (18).

3. The liquid pump according to claim 2, wherein the first housing (16) includes a first end plate (161) and a first closing plate (162) which are oppositely arranged in a thickness direction of the pump body (1), the liquid inlet (11) is formed in the first end plate (161), a plurality of first projections (163) are arranged between the first end plate (161) and the first closing plate (162), the plurality of first projections (163) are arranged around the liquid inlet (11) along a circumferential direction of the first housing (16), and each adjacent two first projections (163) define the first flow passage (13) together with the first end plate (161) and the first closing plate (162);

the second housing (17) comprises a second end plate (171) and a second sealing plate (172) which are oppositely arranged in the thickness direction of the pump body (1), the second sealing plate (172) is located between the first sealing plate (162) and the second end plate (171), the liquid outlet (12) is formed in the second end plate (171), the piezoelectric driver (2) is arranged in the second end plate (171), a plurality of second lugs (173) are arranged between the second end plate (171) and the second sealing plate (172), the second lugs (173) are arranged in the circumferential direction of the second housing (17) at intervals, one end, close to the central axis of the second housing (17), of the second lugs (173) and the second end plate (171) and the second sealing plate (172) jointly define the liquid cavity (15), and every two adjacent second lugs (173) and the second end plate (171) and the second sealing plate (172) jointly define the liquid cavity (15) A flow channel (14);

the first end plate (161) is connected with the second sealing plate (172), the gap (18) is arranged between the first sealing plate (162) and the second sealing plate (172), and a through hole (1723) which is communicated with the gap (18) and the liquid cavity (15) is formed in the second sealing plate (172).

4. A liquid pump according to claim 3, wherein the first end plate (161) is formed with a first annular sump (1611) opening towards the second closure plate (172), the first annular sump (1611) being located outside the first closure plate (162), the first flow passage (13) being located between the first annular sump (1611) and the liquid inlet (11), the second port of the first flow passage (13) and the gap (18) both being in communication with the first annular sump (1611);

a second annular liquid collecting groove (1711) which is opened towards the second sealing plate (172) is formed in the second end plate (171), the second flow channel (14) is located between the second annular liquid collecting groove (1711) and the liquid cavity (15), and a second port of the second flow channel (14) and the liquid outlet (12) are both communicated with the second annular liquid collecting groove (1711);

one side of the second sealing plate (172) facing the first annular liquid collecting groove (1611) is provided with a first positioning protrusion (1721), one side of the second sealing plate (172) facing the second annular liquid collecting groove (1711) is provided with a second positioning protrusion (1722), and the first positioning protrusion (1721) and the second positioning protrusion (1722) are respectively matched with the first annular liquid collecting groove (1611) and the second annular liquid collecting groove (1711).

5. A liquid pump according to claim 2, wherein the first housing (16) has a first annular sump (1611) formed therein, the first flow passage (13) being located between the first annular sump (1611) and the liquid inlet (11), the second port of the first flow passage (13) and the gap (18) both communicating with the first annular sump (1611);

a second annular liquid collecting groove (1711) is formed in the second shell (17), the second flow channel (14) is located between the second annular liquid collecting groove (1711) and the liquid cavity (15), and a second port of the second flow channel (14) and the liquid outlet (12) are communicated with the second annular liquid collecting groove (1711).

6. A liquid pump according to any one of claims 1 to 5, characterised in that a recess (174) is formed in the pump housing (10), the liquid chamber (15) and the piezo actuator (2) being located on either side of a bottom wall (1741) of the recess (174), the piezo actuator (2) being connected to the bottom wall (1741) of the recess (174), the piezo actuator (2) being capable of deforming the bottom wall (1741) of the recess (174) to increase or decrease the volume of the liquid chamber (15) during reciprocal vibration.

7. A liquid pump according to claim 6, characterised in that the junction of the bottom wall (1741) of the recess (174) with the side wall (1743) of the recess (174) is formed with a weakened groove (1742).

8. A liquid pump according to any one of claims 1 to 5, characterised in that the piezoelectric drive (2) comprises an amplitude transformer (21) and a piezoelectric patch (22), the piezoelectric patch (22) being arranged to be caused to oscillate to and fro under the action of an alternating current, the amplitude transformer (21) having a large head end (211) and a small head end (212), the large head end (211) having an outer diameter which is greater than the outer diameter of the small head end (212), the piezoelectric patch (22) being arranged at the large head end (211), the small head end (212) being connected to the pump housing (10).

9. The liquid pump according to claim 8, wherein the pump body (1) has two, the amplitude transformer (21) has two, the piezoelectric patches (22) have a plurality of piezoelectric patches, the piezoelectric actuator (2) further includes a connecting shaft (23), two ends of the connecting shaft (23) are respectively connected to the two amplitude transformers (21), and the piezoelectric patches (22) are sleeved on the connecting shaft (23) and clamped between the two amplitude transformers (21).

10. An unmanned aerial vehicle comprising a liquid pump according to any of claims 1 to 9.

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