WO2026017185A1 - Gas delivery device - Google Patents

Abstract

A gas delivery device, comprising a pump, and a piezoelectric ceramic assembly, a first check valve and a second check valve, which are arranged in the pump, wherein the first check valve and the second check valve are arranged at a gas intake flow channel and a gas output flow channel of the pump, respectively; the piezoelectric ceramic assembly divides an inner cavity of the pump into a first cavity and a second cavity, which are in communication with each other; the gas intake flow channel and the gas output flow channel are respectively in communication with the first cavity and the second cavity; and through holes in communication with the first cavity and the second cavity are provided in a flexible support plate of the piezoelectric ceramic assembly. The volumes of the first cavity and the second cavity are changed by means of the vibration of the piezoelectric ceramic assembly, thereby realizing the suction and discharge of a fluid. The through holes in the flexible support plate make gas flow directly between inner cavities of the pump, thereby reducing the requirements for arranging bypass pipes on housings of conventional pumps, reducing gas flow resistance, improving the integration level and reliability of the pump, and reducing the size and weight of the pump.

Description

A gas conveying device Technical Field

This utility model relates to the field of fluid pump technology, and in particular to a gas conveying device.

Background Technology

Traditional fluid pumps, whether electromagnetic diaphragm pumps or piezoelectric pumps, mostly rely on reciprocating motion to compress or expand the space inside the pump chamber, thereby creating negative pressure to draw in fluid, which is then discharged from the outlet, achieving unidirectional fluid transfer.

Among them, electromagnetic diaphragm pumps generate significant noise during reciprocating motion, exhibit large fluctuations in flow and pressure, and are bulky, making them unsuitable for portable products. Piezoelectric pumps utilize the stretching and bending deformation of piezoelectric vibrators to change the pump chamber volume. In existing technologies, a bypass pipe needs to be installed on the outside of the pump casing to allow gas flow between the two chambers, increasing the flow resistance of gas from one chamber to the other and causing losses in gas flow rate and velocity.

Utility Model Content

The purpose of this invention is to provide a gas conveying device that addresses the shortcomings of existing technologies.

To achieve the above objectives, the technical solution adopted by this utility model is as follows:

A gas delivery device includes a pump body and a piezoelectric ceramic assembly, a first check valve, and a second check valve disposed therein, wherein the first check valve and the second check valve are respectively disposed in the inlet flow channel and the exhaust flow channel of the pump body;

The piezoelectric ceramic assembly divides the pump body cavity into a first cavity and a second cavity that are interconnected, and the air inlet channel and the exhaust channel are respectively connected to the first cavity and the second cavity;

The piezoelectric ceramic assembly includes a flexible support plate and piezoelectric ceramic sheets and a metal substrate disposed opposite each other on both sides thereon. A through hole is formed on the flexible support plate to connect the first cavity and the second cavity.

Furthermore, the through holes are arranged circumferentially on the outer ring of the piezoelectric ceramic assembly. 1

Furthermore, the flexible support plate includes a mounting portion, an outer ring portion, and a flexible hinge portion. The mounting portion is located at the center of the flexible support plate, the outer ring portion is located at the outer edge of the flexible support plate, and the flexible hinge portion is located between the mounting portion and the outer ring portion.

Furthermore, an electrical connection component is provided on the flexible support plate, the piezoelectric ceramic sheet is disposed on one side of the mounting portion and electrically connected to the electrical connection component, and the metal substrate is bonded to the other side of the mounting portion away from the piezoelectric ceramic sheet.

Furthermore, the mounting portion is square, and the through hole is located in the flexible hinge portion;

Two through holes located adjacent to each other at the center of the same side of the flexible hinge portion constitute a vent group, and the vent group is evenly distributed along the circumference of the flexible hinge portion.

Furthermore, a third one-way valve is provided on the flexible support plate at the through hole.

Furthermore, the first check valve and the second check valve are configured with the same structure, including a first valve plate, a valve disc, a support ring plate and a second valve plate arranged sequentially along their thickness direction, and the second valve plate on the inlet flow channel and the first valve plate on the exhaust flow channel are both arranged facing the inner cavity of the pump body.

Holes are made circumferentially at the center of the first valve plate and the second valve plate to form a first hole group and a second hole group, respectively. Multiple valve flaps are formed circumferentially at the center of the valve plate by intersecting dividing lines. The valve flaps are arranged corresponding to the first hole group, and the first hole group and the second hole group are staggered.

Furthermore, the pump body includes a lower cover and an upper cover disposed opposite to each other, the lower cover and the upper cover being respectively pressed and fixed on both sides of the outer edge of the flexible support plate;

The air intake channel and the exhaust channel are respectively disposed on the lower cover and the upper cover, and the center line connecting the air intake channel and the exhaust channel coincides with the line connecting the peak and trough points of the piezoelectric ceramic component package during vibration.

Furthermore, mounting ring grooves are provided at the ends of the air intake channel and the exhaust channel facing the piezoelectric ceramic component, and a sealing ring groove is provided on the outer ring of the groove opening of the mounting ring groove. The first one-way valve and the second one-way valve are respectively disposed in the mounting ring grooves of the lower cover and the upper cover.

Furthermore, multiple air holes are provided at the ends of the air intake channel and the air exhaust channel away from the piezoelectric ceramic sheet, and the air holes are arranged in a honeycomb pattern.

The beneficial effects of this utility model are as follows:

In this application, fluid intake and discharge are achieved by altering the volumes of the first and second chambers through the vibration of a piezoelectric ceramic assembly within the pump body. This design simplifies the pump body structure, improves the pump's integration and reliability, and reduces its size and weight. Simultaneously, the structural design allows the piezoelectric pump to achieve an optimal performance point with a drive frequency exceeding 20 kHz, resulting in quiet operation. A through-hole connecting the first and second chambers is provided on the flexible support plate, allowing gas to flow directly between the pump body chambers, reducing the need for bypass pipes on the outside of the traditional pump casing and lowering gas flow resistance.

Attached Figure Description

To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

Figure 1 is a schematic diagram of the gas conveying device in this utility model;

Figure 2 is a schematic diagram of the gas conveying device in this utility model;

Figure 3 is a schematic diagram of the exploded structure of the gas conveying device in this utility model;

Figure 4 is a schematic diagram of the structure of the inner wall of the lower cover in this utility model;

Figure 5 is a schematic diagram of the flexible support plate in this utility model;

Figure 6 is a cross-sectional structural diagram of the gas conveying device in this utility model;

Figure 7 is a schematic diagram of the structure of the first check valve and the second check valve in this utility model.

Reference numerals: 1. Pump body; 11. Lower cover; 12. Upper cover; 13. Inlet air passage; 14. Exhaust air passage; 15. First cavity; 16. Second cavity; 17. Mounting ring groove; 18. Sealing ring groove; 19. Air hole; 2. Piezoelectric ceramic assembly; 21. Flexible support plate; 211. Mounting part; 212. Outer ring part; 213. Flexible hinge part; 214. Through hole; 22. Piezoelectric ceramic sheet; 23. Metal substrate; 24. Third check valve; 25. Electrical connection assembly; 3. First check valve; 31. First valve plate; 311. First hole group; 32. Valve plate; 321. Cross dividing line; 322. Valve disc; 33. Support ring plate; 34. Second valve plate; 341. Second hole group; 4. Second check valve.

Detailed Implementation

The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

As shown in Figures 1 to 7, a gas delivery device includes a pump body 1 and a piezoelectric ceramic component 2, a first one-way valve 3, and a second one-way valve 4 disposed therein. The first one-way valve 3 and the second one-way valve 4 are respectively disposed in the inlet flow channel 13 and the exhaust flow channel 14 of the pump body 1. The piezoelectric ceramic component 2 divides the inner cavity of the pump body 1 into a first cavity 15 and a second cavity 16 that are interconnected. The inlet flow channel 13 and the exhaust flow channel 14 are respectively connected to the first cavity 15 and the second cavity 16. The piezoelectric ceramic component 2 includes a flexible support plate 21 and piezoelectric ceramic sheets 22 and metal substrates 23 disposed opposite to each other on both sides thereon. A through hole 214 is provided on the flexible support plate 21 to connect the first cavity 15 and the second cavity 16.

The gas delivery device disclosed in this application utilizes ultrasonic or higher frequencies for driving, resulting in noiseless operation of the pump body itself and excellent quiet operation. Fluid intake and discharge are achieved by altering the volume of the first cavity 15 and the second cavity 16 through the vibration of the piezoelectric ceramic component 2 within the pump body 1. A through hole 214 connecting the first cavity 15 and the second cavity 16 is provided on the flexible support plate 21, allowing gas to flow directly between the internal cavities of the pump body 1. This reduces the need for bypass pipes on the outside of the traditional pump body 1, lowers gas flow resistance, simplifies the structure of the pump body 1, improves the pump's integration and reliability, and reduces its size and weight.

Referring further to Figures 2 and 3, through holes 214 are arranged circumferentially on the outer ring of the piezoelectric ceramic assembly 22. The through holes 214 are located in the area of the flexible support plate 21 other than where the piezoelectric ceramic sheet 22 is installed, so as to avoid affecting the vibration of the ceramic piezoelectric sheet. The uniform arrangement of through holes 214 helps to achieve uniform gas flow, further improving the working efficiency and stability of the pump.

In this embodiment, as shown in FIG5, the flexible support plate 21 includes a mounting portion 211, an outer ring portion 212, and a flexible hinge portion 213. The mounting portion 211 is located at the center of the flexible support plate 21, the outer ring portion 212 is located at the outer edge of the flexible support plate 21, and the flexible hinge portion 213 is located between the mounting portion 211 and the outer ring portion 212. The flexible support plate 21 is connected to the pump body 1 through its outer ring portion 212, and the piezoelectric ceramic assembly 2 is disposed in the mounting portion 211.

A power-connecting assembly 24 is provided on the flexible circuit board 21. A piezoelectric ceramic sheet 22 is disposed on one side of the mounting portion 211 and electrically connected to the power-connecting assembly 24. A metal substrate 23 is bonded to the other side of the mounting portion 211 away from the piezoelectric ceramic sheet 22. Through holes 214 are arranged circumferentially along the flexible hinge portion 213.

Specifically, the mounting part 211 is provided with a piezoelectric ceramic sheet 22 in a shape that is not limited to a square, regular polygon, rectangle or circle.

As a preferred embodiment, the flexible support plate 21 is fixedly connected to the pump body 1 via the outer ring portion 212, and the mounting portion 211 on which the piezoelectric ceramic component 2 is installed is connected to the outer ring portion 212 via the flexible hinge portion 213, thereby reducing the vibration resistance of the outer ring portion 212 to the mounting portion 211. Furthermore, the through holes 214 are evenly distributed circumferentially along the flexible hinge portion 213, which, while ensuring the flow within the pump body 1 cavity, can further reduce the vibration resistance of the mounting portion 211, allowing the piezoelectric ceramic component 2 to have a better vibration effect during vibration.

Referring further to Figure 6, a third check valve 24 is provided on the flexible support plate 21 at the through hole 214. The third check valve 24 further controls the flow direction of the gas, ensuring that the gas flows unidirectionally from the first chamber 15 to the second chamber 16, thereby improving the pump's working efficiency and reliability.

In this embodiment, as shown in FIG7, the first one-way valve 3 and the second one-way valve 4 are configured with the same structure, including a first valve plate 31, a valve disc 32, a support ring plate 33 and a second valve plate 34 arranged sequentially along their thickness direction. The second valve plate 31 on the air intake channel 13 and the first valve plate 34 on the exhaust channel 14 are both arranged facing the inner cavity of the pump body 1. The first valve plate 31 and the second valve plate 34 are circumferentially perforated at their center positions to form a first hole group 311 and a second hole group 341, respectively. The valve disc 32 is formed by multiple valve flaps 322 circumferentially distributed at its center position through intersecting dividing lines 321. The valve flaps 322 are correspondingly arranged with the first hole group 311, and the first hole group 311 and the second hole group 341 are staggered.

The first valve plate 31, valve disc 32, support ring plate 33, and second valve plate 34 are stacked sequentially, with their outer edges laser-welded or glued together to form an integral structure. When the first one-way valve 3 and the second one-way valve 4 are working, gas passes through the first hole group 311 on the first valve plate 31, causing the valve disc 322 on the valve disc 32 to move away from the surface of the first valve plate 31. The gas then passes through the support ring plate 33 and the second hole group 341 of the second valve plate 34 in sequence. When gas is blown from the second valve plate 34 toward the first valve plate 31, it presses the valve disc 322 of the valve disc 32 against the surface of the first valve plate 31, blocking the first hole group 311, thereby achieving one-way gas flow.

In this embodiment, as shown in Figures 2 and 3, the pump body 1 includes a lower cover 11 and an upper cover 12 disposed opposite to each other. The lower cover 11 and the upper cover 12 are respectively pressed and fixed on both sides of the outer edge of the flexible circuit board 21. The air inlet channel 13 and the exhaust channel 14 are respectively disposed on the lower cover 11 and the upper cover 12. The center line connecting the air inlet channel 13 and the exhaust channel 14 coincides with the line connecting the peak and trough points of the piezoelectric ceramic component 2 when it vibrates.

During the vibration of the piezoelectric ceramic component 2, the vibration amplitude is largest at its center. By setting the inlet channel 13 and the exhaust channel 14 to correspond to the center of the piezoelectric ceramic plate 22, the vibration energy of the piezoelectric ceramic plate 22 can be maximized, promoting gas intake and exhaust, thereby improving the pump's working efficiency. Since the inlet channel 13 and the exhaust channel 14 are set to correspond to the crests and troughs of the piezoelectric ceramic plate 22, the first one-way valve 3 and the second one-way valve 4 set at the inlet channel 13 and the exhaust channel 14 operate at their optimal efficiency under the influence of the vibration of the piezoelectric ceramic component 2.

In this embodiment, as shown in Figure 4, mounting annular grooves 17 are provided at the ends of the inlet air passage 13 and the exhaust air passage 14 facing the piezoelectric ceramic component 2. A sealing annular groove 18 is formed around the outer circumference of the mounting annular groove 17. The first one-way valve 3 and the second one-way valve 4 are respectively disposed within the mounting annular grooves 17 of the lower cover 11 and the upper cover 12. After the first one-way valve 3 and the second one-way valve 4 are placed in the mounting annular grooves 17, their circumferences are sealed by the sealing annular groove 18, ensuring the stability of the one-way valve installation while further improving its sealing performance.

Furthermore, multiple vents 19 are provided at the ends of the inlet flow channel 13 and the exhaust flow channel 14 away from the piezoelectric ceramic plate 22, and the vents 19 are arranged in a honeycomb pattern. The honeycomb structure of the vents 19 disperses the gas into multiple fine streams when it passes through, so that larger impurities and particles in the gas are blocked outside the vents 19 and cannot enter the pump body 1, thereby reducing the risk of performance degradation or failure of the one-way valve and piezoelectric components.

Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims (10)

A gas delivery device, characterized in that it includes a pump body (1) and a piezoelectric ceramic assembly (2), a first check valve (3) and a second check valve (4) disposed therein, wherein the first check valve (3) and the second check valve (4) are respectively disposed in the inlet flow channel (13) and the exhaust flow channel (14) of the pump body (1); The piezoelectric ceramic component (2) divides the inner cavity of the pump body (1) into a first cavity (15) and a second cavity (16) that are interconnected. The air inlet channel (13) and the exhaust channel (14) are respectively connected to the first cavity (15) and the second cavity (16). The piezoelectric ceramic assembly (2) includes a flexible support plate (21) and piezoelectric ceramic sheets (22) and metal substrates (23) disposed opposite to each other on both sides. A through hole (214) is provided on the flexible support plate (21) to connect the first cavity (15) and the second cavity (16). According to claim 1, the gas conveying device is characterized in that the through hole (214) is arranged circumferentially on the outer ring of the piezoelectric ceramic component (22). According to claim 2, the gas conveying device is characterized in that the flexible support plate (21) includes a mounting part (211), an outer ring part (212) and a flexible hinge part (213), the mounting part (211) is located in the middle of the flexible support plate (21), the outer ring part (212) is located at the outer edge of the flexible support plate (21), and the flexible hinge part (213) is located between the mounting part (211) and the outer ring part (212). According to claim 3, the gas conveying device is characterized in that an electrical connection component (25) is provided on the flexible support plate (21), the piezoelectric ceramic sheet (22) is disposed on one side of the mounting part (211) and electrically connected to the electrical connection component (25), and the metal substrate (23) is bonded to the other side of the mounting part (211) away from the piezoelectric ceramic sheet (22). According to claim 3, the gas conveying device is characterized in that the through hole (214) is arranged circumferentially along the flexible hinge portion (213). The gas conveying device according to any one of claims 1 to 5 is characterized in that a third one-way valve (24) is provided on the flexible support plate (21) at the through hole (214). According to claim 1, the gas conveying device is characterized in that the first one-way valve (3) and the second one-way valve (4) are configured with the same structure, including a first valve plate (31), a valve disc (32), a support ring plate (33) and a second valve plate (34) arranged sequentially along their thickness direction, wherein the second valve plate (31) on the inlet flow channel (13) and the first valve plate (34) on the exhaust flow channel (14) are both arranged facing the inner cavity of the pump body (1); Holes are made circumferentially at the center of the first valve plate (31) and the second valve plate (34) to form a first hole group (311) and a second hole group (341) respectively. Multiple valve discs (322) are formed circumferentially at the center of the valve plate (32) through intersecting dividing lines (321). The valve discs (322) are correspondingly arranged with the first hole group (311), and the first hole group (311) and the second hole group (341) are staggered. According to claim 1, the gas conveying device is characterized in that the pump body (1) includes a lower cover (11) and an upper cover (12) disposed opposite to each other, and the lower cover (11) and the upper cover (12) are respectively pressed and fixed on both sides of the outer edge of the flexible support plate (21); The air intake channel (13) and the exhaust channel (14) are respectively disposed on the lower cover (11) and the upper cover (12). The center line connecting the air intake channel (13) and the exhaust channel (14) coincides with the line connecting the peak and trough points of the piezoelectric ceramic component (2) during vibration. According to claim 8, the gas conveying device is characterized in that an mounting ring groove (17) is provided at one end of the inlet flow channel (13) and the outlet flow channel (14) facing the piezoelectric ceramic component (2), and a sealing ring groove (18) is provided on the outer ring of the groove opening of the mounting ring groove (17), and the first one-way valve (3) and the second one-way valve (4) are respectively provided in the mounting ring groove (17) of the lower cover (11) and the upper cover (12). According to claim 8, the gas conveying device is characterized in that a plurality of air holes (19) are provided at the end of the inlet flow channel (13) and the outlet flow channel (14) away from the piezoelectric ceramic sheet (22), and the air holes (19) are arranged in a honeycomb pattern.