CN-112576530-B - Piezoelectric fan

CN112576530BCN 112576530 BCN112576530 BCN 112576530BCN-112576530-B

Abstract

The invention provides a piezoelectric fan which comprises a swing blade assembly, a piezoelectric actuating unit and a piezoelectric actuating unit, wherein the swing blade assembly is connected with a heat source and comprises a liquid cooling heat dissipation module formed into a laminated structure, the swing blade assembly is provided with a fixing area and a swinging area, the fixing area is fixed, the swinging area is suspended and can swing reciprocally, and the piezoelectric actuating unit is connected with the swing blade assembly and provides power for swinging of the swinging area. According to the piezoelectric fan disclosed by the invention, the heat of a heat source can be rapidly and uniformly dispersed on the swing blade assembly, meanwhile, the piezoelectric actuating unit is excited by an external periodic electric signal to generate vibration to drive the swing area to swing reciprocally, so that the heat dissipation efficiency can be improved, meanwhile, the structure is more compact, the occupied space is small, and the heat dissipation requirement of a narrow space can be met, so that the problems of large system volume, low integration level, complex structure, high process difficulty and high cost in the prior art can be solved.

Inventors

Request for anonymity
Request for anonymity
Request for anonymity
Request for anonymity
Request for anonymity

Assignees

常州威图流体科技有限公司
常州威图流体科技有限公司

Dates

Publication Date: 20260421
Application Date: 20201224
Priority Date: 20201224

Claims (7)

1. A piezoelectric fan, comprising: The swing blade assembly is connected with a heat source, an attaching face is formed on the surface of the swing blade assembly, the swing blade assembly is tightly attached to the heat source through the attaching face, the swing blade assembly comprises a liquid cooling heat dissipation module which is formed into a laminated structure, the liquid cooling heat dissipation module comprises a runner device and a power pump, a runner is arranged in the runner device, the power pump is communicated with the runner device to drive cooling working medium in the runner to flow, the swing blade assembly is provided with a fixing area and a swing area, the fixing area is fixed, and the swing area is suspended and can swing reciprocally; The piezoelectric actuating unit is connected with the swing blade assembly and provides power for swing of the swing area; The liquid cooling heat radiation module is formed into a swing blade; The swing blade has a fixing portion corresponding to the fixing region and a swing portion corresponding to the swing region, and at least a part of the piezoelectric actuation unit is arranged to the swing portion of the swing blade.
2. The piezoelectric fan according to claim 1, wherein the swing blade has an engagement surface adapted to engage with the heat source, and the engagement surface is formed in a single continuous type or in a discrete type.
3. The piezoelectric fan according to claim 2, wherein a heat conducting film is arranged on the swing blade, and the heat conducting film has a heat conducting coefficient higher than that of the liquid cooling heat dissipation module.
4. The piezoelectric fan according to claim 2, wherein the swing blade is provided with a concave-convex portion or a heat conduction fin.
5. The piezoelectric fan of claim 1, wherein the power pump comprises: The pump body is provided with at least one pump cavity, and is also provided with a liquid inlet and a liquid outlet which are communicated with the pump cavity, wherein the liquid inlet and the liquid outlet are used for being communicated with the flow channel; The vibration plate is covered on the pump cavity and connected with the pump body, and can generate reciprocating vibration under the driving of alternating signals so as to change the volume of the pump cavity; The first fluid valve is arranged at the liquid inlet and is used for controlling the cooling working medium in the flow channel to flow into the pump cavity in a unidirectional manner; The second fluid valve is arranged at the liquid outlet and is used for controlling the cooling working medium in the pump cavity to flow into the flow channel in a unidirectional way.
6. The piezoelectric fan according to claim 1, wherein the flow passage device comprises: The runner layer comprises a substrate and a diversion trench formed on the substrate; the panel layer, the panel layer includes at least one deck panel, the panel closing cap the guiding gutter, the guiding gutter with define between the panel layer the runner, be equipped with on the panel layer be suitable for with feed liquor hole and the play liquid hole of power pump intercommunication.
7. The piezoelectric fan according to claim 6, wherein a liquid filling port communicating with the flow passage is provided on the panel layer, and the liquid filling port is sealed by the panel.

Description

Piezoelectric fan Technical Field The invention relates to the field of heat dissipation, in particular to a piezoelectric fan. Background Development and application of large-scale and ultra-large-scale integrated circuits improve the functions of the products and correspondingly increase the power consumption of the whole machine, so that the products are seriously heated in the use process, if the heat cannot be timely dissipated, the too high heat can influence the working performance and the service life of electronic components in the products, so that the user experience is greatly damaged, and the heat dissipation problem becomes a key technical factor for restricting the development of the products such as electronics, electromechanics, photoelectricity and the like towards high performance and miniaturization. The piezoelectric fan is mainly composed of piezoelectric ceramics and a vibrating sheet, and the piezoelectric ceramic material drives the vibrating sheet to resonate when alternating voltage is input by using the inverse piezoelectric effect, so that regular flowing of surrounding air is caused, and the convection heat exchange effect is achieved. However, the piezoelectric fan is usually used as an external heat dissipation device, that is, the piezoelectric fan is arranged near a heat conduction accessory such as a heat sink and a vapor chamber or a heat source, and the heat dissipation purpose is achieved by blowing and dissipating hot air for completing convection heat exchange around the heat conduction accessory such as the heat sink and the vapor chamber or the heat source, so that on one hand, the heat dissipation accessory such as the heat sink and the vapor chamber or the heat source and the fan are arranged in a dispersed manner, the occupied space is large, and in addition, the heat dissipation accessory such as the heat sink and the vapor chamber has a complex structure, large quality, large process difficulty and high cost, and is difficult to be applied to the heat dissipation of a small space of micro-sized electromechanical, electronic and photoelectric equipment in a large scale. Disclosure of Invention The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, an object of the present invention is to provide a piezoelectric fan, which has high heat dissipation efficiency, and can solve the problems of large system volume, low integration level, complex structure, high process difficulty and high cost in the prior art. The piezoelectric fan comprises a swing blade assembly, a piezoelectric actuating unit and a piezoelectric actuating unit, wherein the swing blade assembly is connected with a heat source and comprises a liquid cooling heat dissipation module which is formed into a laminated structure, the swing blade assembly is provided with a fixed area and a swinging area, the fixed area is fixed, the swinging area is suspended and can swing reciprocally, and the piezoelectric actuating unit is connected with the swing blade assembly and provides power for swinging of the swinging area. According to the piezoelectric fan provided by the embodiment of the invention, through arranging the swing blade assembly comprising the liquid cooling heat dissipation module and the piezoelectric actuation unit, when the piezoelectric fan works, under the combined action of heat transfer of the swing blade assembly and circulation of a liquid cooling heat dissipation loop working medium of the liquid cooling heat dissipation module, heat of a heat source can be rapidly and uniformly dispersed on the swing blade assembly, meanwhile, the piezoelectric actuation unit is excited by an external periodic electric signal to generate vibration so as to drive the swing area to swing reciprocally, surrounding air is beaten, so that the flow speed of the surrounding air is accelerated, vortex and turbulent flow are locally formed, therefore, strong convection heat exchange is formed between a thermal boundary layer on the surface of the swing blade assembly and the surrounding air, the heat on the surface of the swing blade assembly is rapidly swept away by the air, the hot air is pushed to take away by continuous reciprocal swing of the swing area, and meanwhile, the heat is continuously transferred onto the swing blade assembly, so that efficient heat dissipation is formed, meanwhile, the structure is more compact, the occupied space is small, and the heat dissipation requirements of a small space can be met, and the problems of large system, low integration, high structure and high process difficulty and high cost in the prior art can be solved. In some embodiments of the invention, the swing blade assembly further comprises a swing blade, and at least one of the swing blade and the liquid cooling heat dissipation module is formed with a bonding surface adapted to cooperate with the heat source, the bonding surface is formed as a single co