CN113649238B

CN113649238B - Fluid control device and dispensing device thereof

Info

Publication number: CN113649238B
Application number: CN202111042011.2A
Authority: CN
Inventors: 黄军
Original assignee: Interface Optoelectronics Shenzhen Co Ltd; Interface Technology Chengdu Co Ltd; General Interface Solution Ltd
Current assignee: Interface Optoelectronics Shenzhen Co Ltd; Interface Technology Chengdu Co Ltd; General Interface Solution Ltd
Priority date: 2021-09-06
Filing date: 2021-09-06
Publication date: 2022-08-30
Anticipated expiration: 2041-09-06
Also published as: CN113649238A; TWI780904B; TW202310935A

Abstract

The invention discloses a fluid control device and a dispensing device thereof. The piezoelectric structure is located in the pump chamber and fixed on the side wall of the pump body through the viscose. The flexible printed circuit board is positioned in the pump chamber and arranged on the piezoelectric structure. When a negative voltage is applied to the piezoelectric structure by the flexible printed circuit board, the volume of the piezoelectric structure is contracted to draw the fluid into the pump chamber. When a positive voltage is applied to the piezoelectric structure by the flexible printed circuit board, the volume of the piezoelectric structure expands to discharge fluid from the pump chamber, and the fluid control device utilizes the expansion and contraction of the piezoelectric structure to accurately control the discharge amount of the fluid.

Description

Fluid control device and dispensing device thereof

Technical Field

The present invention relates to a fluid control technology, and more particularly, to a fluid control device and a dispensing device thereof.

Background

With the progress of technology, the technology of displays is also continuously developed. Light, thin, short, small flat panel displays have replaced the traditional heavy cathode ray tube displays. There are many kinds of flat panel display devices, and common flat panel display devices include liquid crystal display devices, organic light emitting diode display devices, and micro light emitting diode devices. Nowadays, the display device is not limited to a flat surface, and a thin and thin curved surface display is also being developed.

In a curved display, it is usually necessary to deform a display module by an iron frame, then attach the iron frame to a cover plate by using a sealant, and fill a liquid optical adhesive with high optical penetrability into an area surrounded by the sealant between the display module and the cover plate to enhance the structural strength of the display. The existing precise electronic industry widely uses a glue dispensing process, the glue outlet quantity is realized by extruding glue through the air outlet of a cylinder controlled by a magnetic valve to achieve the purpose of glue dispensing, the glue outlet quantity is controlled by calculating the air flow rate, the precision of the glue outlet quantity is low, water ripples appear, the poor coverage of glue dispensing causes the problems of line corrosion and the like.

Therefore, the present invention provides a fluid control device and a dispensing device thereof to solve the problems of the prior art.

Disclosure of Invention

The invention provides a fluid control device and a dispensing device thereof, which have the characteristics of low noise, small volume, quantifiable volume of discharged fluid and environmental protection, can accurately control the dispensing amount and improve the defects of the traditional dispensing.

In an embodiment of the present invention, a fluid control device includes a pump body, at least one piezoelectric structure, and at least two flexible printed circuit boards. The pump body is internally provided with a pump chamber, the side wall of the pump body is provided with a first opening and a second opening which are communicated with the pump chamber, the side wall of the pump body is provided with an inlet valve and an outlet valve, and the inlet valve and the outlet valve respectively seal the first opening and the second opening. The piezoelectric structure is located in the pump chamber and fixed on the side wall of the pump body through the viscose. The flexible printed circuit board is positioned in the pump chamber and arranged on the piezoelectric structure. When a negative voltage is applied to the piezoelectric structure by the flexible printed circuit board, the volume of the piezoelectric structure is contracted to attract the fluid to push the inlet valve away and enter the pump chamber, and the fluid pushes the inlet valve away and the outlet valve closes the second opening. When a positive voltage is applied to the piezoelectric structure by the flexible printed circuit board, the volume of the piezoelectric structure expands to push the fluid away from the outlet valve and discharge the fluid from the pump chamber, and the inlet valve closes the first opening.

In an embodiment of the invention, the piezoelectric structure is a shear piezoelectric structure.

In an embodiment of the invention, the at least one piezoelectric structure includes a first piezoelectric structure and a second piezoelectric structure, the first piezoelectric structure and the second piezoelectric structure are both cuboids when zero voltage is applied to the first piezoelectric structure and the second piezoelectric structure, each of the first piezoelectric structure and the second piezoelectric structure has a first surface and a second surface opposite to each other, the at least two flexible printed circuit boards include a first flexible printed circuit board and two second flexible printed circuit boards, the first flexible printed circuit board is located between the first surfaces of the first piezoelectric structure and the second piezoelectric structure, the two second flexible printed circuit boards are respectively located on the second surfaces of the first piezoelectric structure and the second piezoelectric structure, and the two second flexible printed circuit boards are fixed on the side wall of the pump body through adhesive.

In an embodiment of the invention, the first piezoelectric structure and the second piezoelectric structure are both trapezoidal when a positive voltage or a negative voltage is applied.

In an embodiment of the invention, the length of the rectangular parallelepiped is 75 to 100 mm, the width is 25 to 30 mm, and the height is 0.2 to 10 mm.

In an embodiment of the present invention, a dispensing apparatus includes a pump body, at least one piezoelectric structure, a container, an input rubber tube, an output rubber tube, and at least two flexible printed circuit boards. The pump body is internally provided with a pump chamber, and the piezoelectric structure is positioned in the pump chamber and is fixed on the side wall of the pump body through the viscose. The container is internally provided with a colloid and is provided with a vent hole. One end of the input rubber tube is immersed in the colloid, and the other end of the input rubber tube penetrates through the pump body to be communicated with the pump chamber. One end of the output rubber tube penetrates through the pump body to be communicated with the pump chamber. The flexible printed circuit board is positioned in the pump chamber and arranged on the piezoelectric structure. When negative voltage is applied to the piezoelectric structure by the flexible printed circuit board, the volume of the piezoelectric structure is contracted so as to suck the colloid into the pump chamber through the input rubber tube. When positive voltage is applied to the piezoelectric structure by the flexible printed circuit board, the volume of the piezoelectric structure expands to discharge the colloid through the output rubber tube.

Based on the above, the fluid control device and the dispensing device thereof control the suction and discharge of the fluid by using the piezoelectric structure, have the characteristics of low noise, small volume, quantifiable volume of the discharged fluid and environmental protection, can accurately control the dispensing amount, and improve the defects of the traditional dispensing.

Drawings

Fig. 1 is a schematic structural view of a fluid control apparatus according to a first embodiment of the present invention.

Fig. 2 is a schematic structural view of a fluid control device according to a first embodiment of the present invention when a fluid is sucked.

Fig. 3 is a schematic structural view of a fluid control apparatus according to a first embodiment of the present invention, when discharging a fluid.

Fig. 4 is a structural perspective view of a piezoelectric structure according to an embodiment of the present invention.

Fig. 5 is a schematic structural view of a fluid control device according to a second embodiment of the present invention.

Fig. 6 is a schematic structural view of a fluid control device according to a second embodiment of the present invention when fluid is sucked.

Fig. 7 is a schematic structural view of a fluid control apparatus according to a second embodiment of the present invention, when discharging a fluid.

Fig. 8 is a schematic structural view of a dispensing device according to an embodiment of the invention.

Fig. 9 is a schematic structural view of a dispensing device according to an embodiment of the present invention when sucking fluid.

Fig. 10 is a schematic structural view of a dispensing device discharging fluid according to an embodiment of the invention.

The reference signs are:

1 … fluid control device 200 … pump chamber

10 … Pump body 21_1 … first piezoelectric Structure

100 … Pump Chamber 21_2 … second piezoelectric Structure

101 … first opening 22 … Container

102 … second opening 220 … vent hole

11 … piezoelectric structure 23 … input rubber tube

11_1 … first piezoelectric structure 24 … output hose

11_2 … second piezoelectric structure 25_1 … first flexible printed circuit board

12 … FPC 25_2 … second FPC

12_1 … first FPC 26 … adhesive

12_2 … colloid of second flexible printed circuit board 27 …

13 … inlet valve 28 … drive circuit

14 … outlet valve GND … grounding voltage

15 … viscose L … Length

16 … driver W … Width

2 … height of dispensing device H …

20 … Pump body

Detailed Description

Embodiments of the invention will be further explained by the following description in conjunction with the related drawings. Wherever possible, the same reference numbers will be used throughout the drawings and the description to refer to the same or like parts. In the drawings, the shape and thickness may be exaggerated for simplicity and convenience. It is to be understood that elements not specifically shown in the drawings or described in the specification are of a type well known to those of ordinary skill in the art. Many variations and modifications may be made by one of ordinary skill in the art in light of the above teachings.

When an element is referred to as being "on …," it can be directly on the other element or intervening elements may be present. In contrast, when an element is referred to as being "directly on" another element, there are no other elements present between the two. As used herein, the term "and/or" includes any combination of one or more of the associated listed items.

The description below of "one embodiment" or "an embodiment" refers to a particular element, structure, or feature associated with at least one embodiment. Thus, the appearances of the phrase "one embodiment" or "an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

The disclosure has been described with respect to the following examples, which are intended to be illustrative only, since various changes and modifications may be made herein without departing from the spirit and scope of the disclosure, as defined by the appended claims. Throughout the specification and claims, unless the context clearly dictates otherwise, the words "a" and "an" include the word "a" and "an" and "the" include "one or at least one" of the element or constituent. Furthermore, as used in this disclosure, the singular articles "a", "an", and "the" include plural referents unless the context clearly dictates otherwise. Also, as used in this description and throughout the claims that follow, the meaning of "in" may include "in" and "on" unless the content clearly dictates otherwise. The term (terms) used throughout the specification and claims, unless otherwise indicated, has the ordinary meaning as commonly understood by one of ordinary skill in the art, in the context of this disclosure, and in the specific context. Certain terms used to describe the present disclosure are discussed below or elsewhere in this specification to provide additional guidance to the practitioner (practitioner) in describing the present disclosure. The use of examples anywhere throughout the specification, including any examples of words discussed herein, is by way of illustration only and certainly does not limit the scope or meaning of the disclosure or any of the exemplary words. Likewise, the present disclosure is not limited to the various embodiments set forth in this specification.

It is understood that as used herein, the terms "comprising," "including," "having," "containing," "including," and the like are open-ended, i.e., meaning including but not limited to. Moreover, not all objects, advantages, or features of the disclosure are necessarily to be achieved in any one embodiment or claimed herein. In addition, the abstract and the title of the invention are provided for assisting the search of patent documents and are not intended to limit the scope of the invention.

As used herein, the term "substantially", "about" or "approximately" shall mean within 20%, preferably within 10%, of a given value or range. Moreover, the quantities provided herein can be approximate, meaning that the terms "about", "approximately", or "approximately" can be used unless otherwise indicated. When an amount, concentration, or other value or parameter is given a range, preferred range or table listing upper and lower desired values, it is to be understood that all ranges formed from any upper and lower pair of values or desired values is specifically disclosed, regardless of whether ranges are separately disclosed. For example, if a range of lengths from X centimeters to Y centimeters is disclosed, it should be considered that lengths of H centimeters are disclosed and H can be any real number between X and Y.

In addition, the terms "electrically coupled" or "electrically connected," if used, are intended to encompass any direct or indirect electrical connection. For example, if a first device is electrically coupled to a second device, that connection may be through a direct connection, or through an indirect connection via other devices and connections. In addition, if the description relates to the transmission and provision of electrical signals, those skilled in the art should understand that attenuation or other non-ideal changes may be accompanied in the transmission process of electrical signals, but the source of the transmission or provision of electrical signals and the receiving end should be regarded as the same signal substantially if they are not described specifically. For example, if the electrical signal S is transmitted (or provided) from the terminal a of the electronic circuit to the terminal B of the electronic circuit, wherein a voltage drop may occur across the source and drain of a transistor switch and/or a possible stray capacitance, but the purpose of this design is not to deliberately use the attenuation or other non-ideal changes that occur during transmission (or provision) to achieve certain specific technical effects, the electrical signal S should be considered as substantially the same signal at the terminal a and the terminal B of the electronic circuit.

Unless specifically stated otherwise, conditional expressions or words, such as "can", "possibly" (result) "," perhaps (light) ", or" may ", are generally intended to convey that embodiments of the present invention have, but may also be interpreted as having, features, elements, or steps that may not be required. In other embodiments, these features, elements, or steps may not be required.

The fluid control device and the dispensing device thereof of the present invention use the piezoelectric structure to control the suction and discharge of the fluid, have the characteristics of low noise, small volume, quantifiable volume of the discharged fluid, environmental protection, and can accurately control the dispensing amount and improve the defects of the conventional dispensing.

Fig. 1 is a schematic structural view of a fluid control device according to a first embodiment of the present invention, fig. 2 is a schematic structural view of the fluid control device according to the first embodiment of the present invention when a fluid is sucked, and fig. 3 is a schematic structural view of the fluid control device according to the first embodiment of the present invention when a fluid is discharged. Referring to fig. 1, 2 and 3, a fluid control device 1 according to a first embodiment of the present invention is described below. The fluid control device 1 includes a pump body 10, at least one piezoelectric structure 11 and at least two flexible printed circuit boards 12, wherein the material of the piezoelectric structure 11 is ceramic, but the invention is not limited thereto. For convenience and clarity, the number of the piezoelectric structures 11 is illustrated as one, and the number of the flexible printed circuit boards 12 is illustrated as two, but the invention is not limited thereto. The pump body 10 has a pump chamber 100 therein, a side wall of the pump body 10 has a first opening 101 and a second opening 102 communicating with the pump chamber 100, the side wall of the pump body 10 is provided with an inlet valve 13 and an outlet valve 14, wherein the inlet valve 13 and the outlet valve 14 respectively seal the first opening 101 and the second opening 102, and the inlet valve 13 and the outlet valve 14 are one-way valves. The piezoelectric structure 11 is located in the pump chamber 100 and is fixed to the side wall of the pump body 10 by the adhesive 15. Two flexible printed circuit boards 12 are located in the pump chamber 100 and are disposed on the piezoelectric structure 11. In some embodiments of the present invention, the flexible printed circuit board 12 can be fixed on the sidewall of the pump body 10 through the adhesive 15.

The two flexible printed circuit boards 12 can be further electrically connected to a driving circuit 16. As shown in fig. 2, when the driving circuit 16 applies a negative voltage to the piezoelectric structure 11 by using the two flexible printed circuit boards 12, the volume of the piezoelectric structure 11 is shrunk, so that the gas pressure in the pump chamber 100 is less than the external gas pressure, so as to draw the fluid to push away the inlet valve 13 and enter the pump chamber 100, and the outlet valve 14 closes the second opening 102. The fluid may be a liquid or a gas. In addition, in order to avoid affecting the fixing property of the piezoelectric structure 11, the flexible printed circuit board 12 fixed on the adhesive 15 can be applied with the ground voltage GND to avoid the deformation of the piezoelectric structure 11 near the adhesive 15. As shown in fig. 3, when the driving circuit 16 applies a positive voltage to the piezoelectric structure 11 by using the two flexible printed circuit boards 12, the volume of the piezoelectric structure 11 expands to push the fluid away from the outlet valve 14 and out of the pump chamber 100, and the inlet valve 13 closes the first opening 101. Similarly, the FPC 12 fixed on the adhesive 15 is applied with a ground voltage GND to prevent the piezoelectric structure 11 near the adhesive 15 from deforming. Because piezoelectric structure 11 has low noise when deformation, and the deformation volume is little, quantifiable again, and the piezoelectricity material belongs to the environmental protection material again, so can accurate control fluid discharge amount.

Fig. 4 is a structural perspective view of a piezoelectric structure according to an embodiment of the present invention. The piezoelectric structure 11 may be a shear type piezoelectric structure, but the present invention is not limited thereto. As shown in fig. 4, the piezoelectric structure 11 is a rectangular parallelepiped when a zero voltage is applied, and the piezoelectric structure 11 is a trapezoidal body when a positive voltage or a negative voltage is applied. Since the piezoelectric structure 11 is a shear piezoelectric structure and also a rectangular parallelepiped, the length L of the piezoelectric structure 11 is much greater than the width W, and the width W is much greater than the height H of the piezoelectric structure 11. Specifically, the length L of the rectangular parallelepiped is 75 to 100 mm, the width W is 25 to 30 mm, and the height H is 0.2 to 10 mm, but the invention is not limited thereto. If the bottom surface of the rectangular parallelepiped of the piezoelectric structure 11 is applied with the ground voltage GND, it indicates that the top surface of the piezoelectric structure 11 is deformed. When the piezoelectric structure 11 expands, the length L of the top surface of the piezoelectric structure 11 increases by 2 Δ L, where the volume of the piezoelectric structure 11 is (L + Δ L) × W × H, where Δ L ═ V × d, V denotes the voltage drop across the piezoelectric structure 11, and d denotes the piezoelectric coefficient of the piezoelectric structure 11. When the piezoelectric structure 11 contracts, the length L of the top surface of the piezoelectric structure 11 decreases by 2 Δ L, and the volume of the piezoelectric structure 11 is (L- Δ L) × W × H. From the above calculation, when one piezoelectric structure 11 undergoes one contraction and one expansion, the volume of the fluid that can be discharged is 2 Δ L × W × H.

Fig. 5 is a schematic structural view of a fluid control device according to a second embodiment of the present invention. Fig. 6 is a schematic structural view of a fluid control device according to a second embodiment of the present invention when fluid is sucked. Fig. 7 is a schematic structural view of a fluid control apparatus according to a second embodiment of the present invention, when discharging a fluid. Referring to fig. 5, 6 and 7, a fluid control device 1 according to a second embodiment of the present invention is described below. The fluid control device 1 includes a pump body 10, a first piezoelectric structure 11_1, a second piezoelectric structure 11_2, a first flexible printed circuit board 12_1, and two second flexible printed circuit boards 12_2, wherein the first piezoelectric structure 11_1 and the second piezoelectric structure 11_2 are made of ceramics, but the invention is not limited thereto. The pump body 10 has a pump chamber 100 therein, a side wall of the pump body 10 has a first opening 101 and a second opening 102 communicating with the pump chamber 100, the side wall of the pump body 10 is provided with an inlet valve 13 and an outlet valve 14, wherein the inlet valve 13 and the outlet valve 14 respectively seal the first opening 101 and the second opening 102, and the inlet valve 13 and the outlet valve 14 are one-way valves. The first piezoelectric structure 11_1 and the second piezoelectric structure 11_2 are located in the pump chamber 100 and fixed on the sidewall of the pump body 10 through the adhesive 15. Since the first piezoelectric structure 11_1 and the second piezoelectric structure 11_2 are rectangular solids when the zero voltage is applied, each of the first piezoelectric structure 11_1 and the second piezoelectric structure 11_2 has a first surface and a second surface opposite to each other. The first flexible printed circuit board 12_1 and the two second flexible printed circuit boards 12_2 are located in the pump chamber 100. The first flexible printed circuit board 12_1 is located between the first surfaces of the first piezoelectric structure 11_1 and the second piezoelectric structure 11_2, the two second flexible printed circuit boards 12_2 are respectively located on the second surfaces of the first piezoelectric structure 11_1 and the second piezoelectric structure 11_2, and the two second flexible printed circuit boards 11_2 are fixed on the side wall of the pump body 10 through the adhesive 15.

The first flexible printed circuit board 12_1 and the two second flexible printed circuit boards 12_2 can be further electrically connected to a driving circuit 16. As shown in fig. 6, when the driving circuit 16 applies negative voltages to the first piezoelectric structure 11_1 and the second piezoelectric structure 11_2 by using the first flexible printed circuit board 12_1 and the two second flexible printed circuit boards 12_2, the volumes of the first piezoelectric structure 11_1 and the second piezoelectric structure 11_2 will shrink, so that the gas pressure in the pump chamber 100 is smaller than the external gas pressure to draw the fluid to push away the inlet valve 13 and enter the pump chamber 100, and the outlet valve 14 closes the second opening 102. The fluid may be a liquid or a gas. In addition, in order to avoid affecting the fixing property of the first piezoelectric structure 11_1 and the second piezoelectric structure 11_2, the second flexible printed circuit board 12_2 fixed on the adhesive 15 can be applied with the ground voltage GND to prevent the first piezoelectric structure 11_1 and the second piezoelectric structure 11_2 near the adhesive 15 from being deformed. As shown in fig. 7, when the driving circuit 16 applies positive voltages to the first piezoelectric structure 11_1 and the second piezoelectric structure 11_2 by using the first flexible printed circuit board 12_1 and the two second flexible printed circuit boards 12_2, the volumes of the first piezoelectric structure 11_1 and the second piezoelectric structure 11_2 expand, so that the fluid pushes the outlet valve 14 away and is discharged from the pump chamber 100, and the inlet valve 13 closes the first opening 101. Similarly, the second flexible printed circuit board 12_2 fixed on the adhesive 15 can be applied with the ground voltage GND to prevent the first piezoelectric structure 11_1 and the second piezoelectric structure 11_2 near the adhesive 15 from being deformed. Since the first piezoelectric structure 11_1 and the second piezoelectric structure 11_2 have low noise during deformation, and the deformation amount is small and quantifiable, and the piezoelectric material is an environment-friendly material, the fluid discharge amount can be precisely controlled.

Referring to fig. 5 and 4, since the first piezoelectric structure 11_1 and the second piezoelectric structure 11_2 are the same as the piezoelectric structures in the first embodiment in terms of material, volume and shape, the first piezoelectric structure 11_1 and the second piezoelectric structure 11_2 are rectangular solids when a zero voltage is applied thereto, and the first piezoelectric structure 11_1 and the second piezoelectric structure 11_2 are trapezoidal when a positive voltage or a negative voltage is applied thereto, the volume of the fluid that can be discharged after one contraction and one expansion is 4 Δ L × W × H relative to the first embodiment.

Fig. 8 is a schematic structural view of a dispensing device according to an embodiment of the invention. Fig. 9 is a schematic structural view of a dispensing device according to an embodiment of the present invention when sucking fluid. Fig. 10 is a schematic structural view of a dispensing device discharging fluid according to an embodiment of the invention. Referring to fig. 8, 9 and 10, a dispensing device 2 according to an embodiment of the invention is described below. The dispensing device 2 includes a pump body 20, at least one piezoelectric structure, a container 22, an input hose 23, an output hose 24, and at least two flexible printed circuit boards. The dispensing device 2 uses two piezoelectric structures, i.e., a first piezoelectric structure 21_1 and a second piezoelectric structure 21_ 2. The dispensing device 2 uses three flexible printed circuit boards, namely a first flexible printed circuit board 25_1 and two second flexible printed circuit boards 25_ 2. The pump body 20 has a pump chamber 200 therein, and the first piezoelectric structure 21_1 and the second piezoelectric structure 21_2 are located in the pump chamber 200 and fixed on the sidewall of the pump body 20 through the adhesive 26. The container 22 contains a gel 27 therein, and the container 22 has a vent hole 220. One end of the input hose 23 is immersed in the gel 27, and the other end penetrates the pump body 20 to communicate with the pump chamber 200. One end of the output hose 24 penetrates the pump body 20 to communicate with the pump chamber 200. The first flexible printed circuit board 25_1 and the second flexible printed circuit board 25_2 are located in the pump chamber 200. Since the first piezoelectric structure 21_1 and the second piezoelectric structure 21_2 are cuboids when the zero voltage is applied, each of the first piezoelectric structure 21_1 and the second piezoelectric structure 21_2 has a first surface and a second surface opposite to each other. The first flexible printed circuit board 25_1 is located between the first surfaces of the first piezoelectric structure 21_1 and the second piezoelectric structure 21_2, the two second flexible printed circuit boards 25_2 are respectively located on the second surfaces of the first piezoelectric structure 21_1 and the second piezoelectric structure 21_2, and the two second flexible printed circuit boards 25_2 are fixed on the side wall of the pump body 20 through the adhesive 26.

The first flexible printed circuit board 25_1 and the two second flexible printed circuit boards 25_2 can be further electrically connected to a driving circuit 28. As shown in fig. 9, when the driving circuit 28 applies negative voltages to the first piezoelectric structure 21_1 and the second piezoelectric structure 21_2 by using the first flexible printed circuit board 25_1 and the two second flexible printed circuit boards 25_2, the volumes of the first piezoelectric structure 21_1 and the second piezoelectric structure 21_2 will contract, so that the gas pressure in the pump chamber 200 is smaller than the external gas pressure, and the colloid 27 is sucked into the pump chamber 200 through the input hose 23. In addition, to avoid affecting the fixing property of the first piezoelectric structure 21_1 and the second piezoelectric structure 21_2, the second flexible printed circuit board 25_2 fixed on the adhesive 26 can be applied with the ground voltage GND to prevent the first piezoelectric structure 21_1 and the second piezoelectric structure 21_2 near the adhesive 26 from being deformed. As shown in fig. 10, when the driving circuit 28 applies positive voltages to the first piezoelectric structure 21_1 and the second piezoelectric structure 21_2 by using the first flexible printed circuit board 25_1 and the two second flexible printed circuit boards 25_2, the volumes of the first piezoelectric structure 21_1 and the second piezoelectric structure 21_2 expand, so as to discharge the colloid 27 from the output hose 24. Similarly, the second flexible printed circuit board 25_2 fixed on the adhesive 26 can be applied with the ground voltage GND to prevent the first piezoelectric structure 21_1 and the second piezoelectric structure 21_2 near the adhesive 26 from being deformed. Since the first piezoelectric structure 21_1 and the second piezoelectric structure 21_2 have low noise and small deformation amount during deformation, and can be quantized, and the piezoelectric material is an environment-friendly material, the fluid discharge amount can be precisely controlled.

Referring to fig. 8 and 4, the first piezoelectric structure 21_1 and the second piezoelectric structure 21_2 are the same as the piezoelectric structure of the fluid control device in terms of material, volume and shape. Since the first piezoelectric structure 21_1 and the second piezoelectric structure 21_2 are both rectangular solids when zero voltage is applied thereto, and the first piezoelectric structure 21_1 and the second piezoelectric structure 21_2 are both trapezoidal solids when positive voltage or negative voltage is applied thereto, the volume of the colloid 27 that can be discharged after one contraction and one expansion is 4 Δ L × W × H.

According to the embodiments, the fluid control device and the dispensing device thereof control the suction and discharge of the fluid by using the piezoelectric structure, have the characteristics of low noise, small volume, quantifiable volume of discharged fluid and environmental protection, can accurately control the dispensing amount, and improve the defects of the traditional dispensing.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, so that equivalent variations and modifications in shape, structure, characteristics and spirit described in the scope of the claims of the present invention are included in the scope of the present invention.

Claims

1. A fluid control device, comprising:

the pump comprises a pump body, a first valve, a second valve, a first valve and a second valve, wherein a pump chamber is arranged in the pump body, a first opening and a second opening which are communicated with the pump chamber are formed in the side wall of the pump body, an inlet valve and an outlet valve are arranged on the side wall of the pump body, and the inlet valve and the outlet valve respectively seal the first opening and the second opening;

at least one piezoelectric structure, located in the pump chamber and fixed on the side wall of the pump body through adhesive; and

at least two flexible printed circuit boards, located in the pump chamber and disposed on the at least one piezoelectric structure, wherein when a negative voltage is applied to the at least one piezoelectric structure by the at least two flexible printed circuit boards, a volume of the at least one piezoelectric structure contracts to draw a fluid to push the inlet valve open and enter the pump chamber, and the outlet valve closes the second opening, and when a positive voltage is applied to the at least one piezoelectric structure by the at least two flexible printed circuit boards, a volume of the at least one piezoelectric structure expands to push the fluid to push the outlet valve open and discharge the fluid from the pump chamber, and the inlet valve closes the first opening;

wherein the at least one piezoelectric structure is a shear piezoelectric structure;

the at least one piezoelectric structure comprises a first piezoelectric structure and a second piezoelectric structure, the first piezoelectric structure and the second piezoelectric structure are cuboids when zero voltage is applied to the first piezoelectric structure and the second piezoelectric structure, each of the first piezoelectric structure and the second piezoelectric structure is provided with a first surface and a second surface which are opposite to each other, the at least two flexible printed circuit boards comprise a first flexible printed circuit board and two second flexible printed circuit boards, the first flexible printed circuit board is located between the first surfaces of the first piezoelectric structure and the second piezoelectric structure, the two second flexible printed circuit boards are respectively located on the second surfaces of the first piezoelectric structure and the second piezoelectric structure, and the two second flexible printed circuit boards are fixed on the side wall of the pump body through the adhesive;

the first piezoelectric structure and the second piezoelectric structure are both trapezoidal when being applied with positive voltage or negative voltage, and are fixed on the adhesive, the two second flexible printed circuit boards are applied with grounding voltage, so that the first piezoelectric structure and the second piezoelectric structure which are close to the adhesive are prevented from deforming.

2. The fluid control device according to claim 1, wherein the rectangular parallelepiped has a length of 75 to 100 mm, a width of 25 to 30 mm, and a height of 0.2 to 10 mm.

3. A kind of glue dropping apparatus, characterized by, comprising:

a pump body having a pump chamber therein;

the piezoelectric structure is positioned in the pump chamber and is fixed on the side wall of the pump body through adhesive;

the container is used for accommodating the colloid and is provided with a vent hole;

one end of the input rubber tube is immersed in the colloid, and the other end of the input rubber tube penetrates through the pump body to be communicated with the pump chamber;

one end of the output rubber tube penetrates through the pump body to be communicated with the pump chamber; and

at least two flexible printed circuit boards, located in the pump chamber and disposed on the at least one piezoelectric structure, wherein when a negative voltage is applied to the at least one piezoelectric structure by the at least two flexible printed circuit boards, a volume of the at least one piezoelectric structure contracts to suck the colloid into the pump chamber through the input hose, and when a positive voltage is applied to the at least one piezoelectric structure by the at least two flexible printed circuit boards, a volume of the at least one piezoelectric structure expands to discharge the colloid through the output hose;

4. The dispensing device of claim 3, wherein the cuboid has a length of 75-100 mm, a width of 25-30 mm, and a height of 0.2-10 mm.