Gas conveying device

Abstract

The utility model relates to the technical field of fluid pumps, in particular to a gas conveying device which comprises a pump body, a piezoelectric ceramic component, a first one-way valve and a second one-way valve, the piezoelectric ceramic component, the first one-way valve and the second one-way valve are arranged in the pump body, and the first one-way valve and the second one-way valve are arranged at an air inlet flow channel and an exhaust flow channel of the pump body respectively. The piezoelectric ceramic assembly divides an inner cavity of the pump body into a first cavity and a second cavity which are communicated with each other, and the air inlet flow channel and the air outlet flow channel are communicated with the first cavity and the second cavity respectively. And a through hole communicated with the first cavity and the second cavity is formed in the flexible supporting plate of the piezoelectric ceramic assembly. The volumes of the first cavity and the second cavity are changed through vibration of the piezoelectric ceramic assembly, and suction and discharge of fluid are achieved. The through holes in the flexible supporting plate enable gas to directly circulate in the inner cavity of the pump body, the requirement for arranging a bypass pipeline on a traditional pump body shell is reduced, the gas flowing resistance is reduced, the integration degree and reliability of the pump are improved, and the size and weight of the pump are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of fluid pumps, in particular to a gas delivery device. Background Art

[0002] For traditional fluid pumps, whether electromagnetic diaphragm pumps or piezoelectric pumps, their working principles mostly rely on reciprocating motion to compress or expand the space in the pump cavity, thereby forming negative pressure to suck in the fluid and then discharging it from the discharge port to achieve the one-way transmission of the fluid.

[0003] Among them, electromagnetic diaphragm pumps will generate relatively large noise during reciprocating motion, and have large fluctuations in flow rate and pressure. The pump has a large volume and cannot be applied to portable products. Piezoelectric pumps use the stretching and bending deformation of piezoelectric vibrators to change the volume of the pump cavity. In the prior art, it is necessary to open a bypass pipeline outside the pump shell to realize the gas flow between the two cavities in the pump, which increases the flow resistance of the gas from one cavity to another cavity, resulting in the loss of gas flow rate and velocity. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a gas delivery device aiming at the defects existing in the prior art.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] A gas delivery device includes a pump body and a piezoelectric ceramic assembly, a first one-way valve and a second one-way valve arranged therein. The first one-way valve and the second one-way valve are respectively arranged in the air inlet channel and the exhaust air channel of the pump body;

[0007] The piezoelectric ceramic assembly divides the inner cavity of the pump body into a first cavity and a second cavity which are communicated with each other. The air inlet channel and the exhaust air channel are respectively communicated with the first cavity and the second cavity;

[0008] The piezoelectric ceramic assembly includes a flexible support plate and piezoelectric ceramic sheets and metal substrates oppositely arranged on both sides thereof. A through hole communicating the first cavity and the second cavity is opened on the flexible support plate.

[0009] Further, the through holes are circumferentially arranged on the outer ring of the piezoelectric ceramic assembly.

[0010] Further, 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.

[0011] Furthermore, a power 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 power connection component. The metal substrate is bonded to the other side of the mounting portion away from the piezoelectric ceramic sheet.

[0012] Furthermore, the mounting portion is arranged as a square, and the through hole is disposed in the flexible hinge portion;

[0013] Two of the through holes adjacent to each other and disposed at the same-side center position of the flexible hinge portion form an air vent group, and the air vent groups are uniformly arranged along the circumferential direction of the flexible hinge portion.

[0014] Furthermore, a third one-way valve is provided on the flexible support plate at the position of the through hole.

[0015] Furthermore, the first one-way valve and the second one-way valve are arranged with the same structure, and include a first valve plate, a valve sheet, a support ring plate, and a second valve plate sequentially arranged along the thickness direction thereof. The second valve plate on the air inlet flow path and the first valve plate on the exhaust flow path both face the inner cavity of the pump body;

[0016] Circumferential openings are formed at the central positions of the first valve plate and the second valve plate to form a first hole group and a second hole group respectively. The central position of the valve sheet forms a plurality of valve flaps distributed circumferentially through cross dividing lines. The valve flaps are correspondingly arranged with the first hole group, and the first hole group and the second hole group are arranged in a staggered manner.

[0017] Furthermore, the pump body includes a lower cover and an upper cover which are oppositely arranged. The lower cover and the upper cover are respectively pressed and fixed on both sides of the outer peripheral edge of the flexible support plate;

[0018] The air inlet flow path and the exhaust flow path are respectively arranged on the lower cover and the upper cover. The central connection line of the air inlet flow path and the exhaust flow path coincides with the connection line of the wave crest and wave trough points during the vibration of the piezoelectric ceramic component package.

[0019] Furthermore, mounting ring grooves are provided at one ends of the air inlet flow path and the exhaust flow path facing the piezoelectric ceramic component. A glue sealing ring groove is provided on the outer ring of the notch of the mounting ring groove. The first one-way valve and the second one-way valve are respectively arranged in the mounting ring grooves of the lower cover and the upper cover.

[0020] Furthermore, a plurality of air holes are provided at one ends of the air inlet flow path and the exhaust flow path away from the piezoelectric ceramic sheet, and the air holes are all arranged in a honeycomb shape.

[0021] The beneficial effects of the present utility model are as follows:

[0022] In this application, the volume of the first cavity and the second cavity is changed by the vibration of the piezoelectric ceramic component arranged in the pump body, so as to realize the suction and discharge of fluid. This design simplifies the structure of the pump body, improves the integration and reliability of the pump, and reduces the volume and weight of the pump. At the same time, through the structural design, the driving frequency of the optimal performance point of the piezoelectric pump reaches more than 20 kHz to achieve the effect of silence. Through holes communicating the first cavity and the second cavity are formed on the flexible support plate, so that gas can directly flow between the inner cavities of the pump body, reducing the need for bypass pipelines to be arranged outside the traditional pump shell and reducing the gas flow resistance. Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to these drawings.

[0024] Figure 1 Schematic diagram of the gas delivery device in the present invention;

[0025] Figure 2 Structural schematic diagram of the gas delivery device in the present invention;

[0026] Figure 3 Exploded structural schematic diagram of the gas delivery device in the present invention;

[0027] Figure 4 Structural schematic diagram of the inner wall of the lower cover in the present invention;

[0028] Figure 5 Structural schematic diagram of the flexible support plate in the present invention;

[0029] Figure 6 Cross-sectional structural schematic diagram of the gas delivery device in the present invention;

[0030] Figure 7 Structural schematic diagram of the first one-way valve and the second one-way valve in the present invention.

[0031] Reference numerals: 1, pump body; 11, lower cover; 12, upper cover; 13, intake air flow channel; 14, exhaust air flow channel; 15, first cavity; 16, second cavity; 17, mounting ring groove; 18, glue sealing ring groove; 19, air hole; 2, piezoelectric ceramic assembly; 21, flexible support plate; 211, mounting portion; 212, outer ring portion; 213, flexible hinge portion; 214, through hole; 22, piezoelectric ceramic sheet; 23, metal substrate; 24, third one-way valve; 25, power connection assembly; 3, first one-way valve; 31, first valve plate; 311, first hole group; 32, valve sheet; 321, cross dividing line; 322, valve flap; 33, support ring plate; 34, second valve plate; 341, second hole group; 4, second one-way valve. Detailed implementation mode

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0033] It should be noted that when an element is referred to as "fixed to" another element, it can be directly on the other element or there can also be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a middle element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation mode.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0035] As Figures 1 to 7 shown, a gas delivery device includes a pump body 1 and a piezoelectric ceramic assembly 2, a first one-way valve 3 and a second one-way valve 4 arranged therein. The first one-way valve 3 and the second one-way valve 4 are respectively arranged in the intake air flow channel 13 and the exhaust air flow channel 14 of the pump body 1; the piezoelectric ceramic assembly 2 divides the inner cavity of the pump body 1 into a first cavity 15 and a second cavity 16 that communicate with each other, and the intake air flow channel 13 and the exhaust air flow channel 14 communicate with the first cavity 15 and the second cavity 16 respectively; the piezoelectric ceramic assembly 2 includes a flexible support plate 21 and piezoelectric ceramic sheets 22 and metal substrates 23 oppositely arranged on both sides thereof, and a through hole 214 communicating the first cavity 15 and the second cavity 16 is provided on the flexible support plate 21.

[0036] In the gas delivery device solution disclosed in the present application, it is driven at a frequency above ultrasonic frequency, and the pump body itself does not generate noise, with good sound insulation effect. By setting the vibration of the piezoelectric ceramic component 2 in the pump body 1, the volumes of the first cavity 15 and the second cavity 16 are changed to achieve the suction and discharge of the fluid. Through holes 214 communicating the first cavity 15 and the second cavity 16 are provided on the flexible support plate 21, enabling the gas to directly flow between the inner cavities of the pump body 1, reducing the need for a bypass pipeline on the outside of the traditional pump body 1, reducing the gas flow resistance, simplifying the structure of the pump body 1, improving the integration and reliability of the pump, and reducing the volume and weight of the pump.

[0037] Further referring to Figure 2 and Figure 3 As shown, the through holes 214 are arranged circumferentially on the outer ring of the piezoelectric ceramic component 2. The through holes 214 are arranged in the area of the flexible support plate 21 other than the area where the piezoelectric ceramic chips 22 are installed, avoiding affecting the vibration of the ceramic piezoelectric chips. The uniform arrangement of the through holes 214 helps to achieve uniform gas flow, further improving the working efficiency and stability of the pump.

[0038] In this embodiment, as Figure 5 shown, 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 component 2 is arranged on the mounting portion 211.

[0039] A power connection component 25 is provided on the flexible circuit board 21. The piezoelectric ceramic chips 22 are arranged on one side of the mounting portion 211 and electrically connected to the power connection component 25. The metal substrate 23 is bonded to the other side of the mounting portion 211 away from the piezoelectric ceramic chips 22. The through holes 214 are arranged circumferentially along the flexible hinge portion 213.

[0040] Specifically, the mounting portion 211 is arranged corresponding to the piezoelectric ceramic chips 22 and is not limited to a square, a regular polygon, a rectangle or a circle.

[0041] As a preference of the above embodiment, the flexible support plate 21 is fixedly connected to the pump body 1 through 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 through the flexible hinge portion 213, reducing the vibration resistance of the outer ring portion 212 to the mounting portion 211. Further, the through holes 214 are uniformly arranged circumferentially on the flexible hinge portion 213. When ensuring the flow inside the pump body 1, the vibration resistance of the mounting portion 211 can be further reduced, enabling the piezoelectric ceramic component 2 to have a better vibration effect when vibrating.

[0042] Further referring to Figure 6As shown, a third one-way valve 24 is provided at the through hole 214 on the flexible support plate 21. The flow direction of the gas is further controlled by the third one-way valve 24 to ensure the one-way flow of the gas from the first cavity 15 to the second cavity 16, improving the working efficiency and reliability of the pump.

[0043] In this embodiment, as Figure 7 shown, the first one-way valve 3 and the second one-way valve 4 are set to have the same structure, including a first valve plate 31, a valve piece 32, a support ring plate 33, and a second valve plate 34 arranged in sequence along the thickness direction thereof. The second valve plate 34 on the intake air flow channel 13 and the first valve plate 31 on the exhaust air flow channel 14 both face the inner cavity of the pump body 1; circumferential holes are formed at the central positions 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. The central position of the valve piece 32 forms a plurality of valve flaps 322 distributed circumferentially through a cross dividing line 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 arranged in a staggered manner.

[0044] The first valve plate 31, the valve piece 32, the support ring plate 33, and the second valve plate 34 are stacked in sequence, and are integrally formed by laser welding the outer edges or by bonding the outer edges with glue. When the first one-way valve 3 and the second one-way valve 4 work, the gas passes through the first hole group 311 on the first valve plate 31, causing the valve flaps 322 on the valve piece 32 to move away from the surface of the first valve plate 31, and then the gas passes through the support ring plate 33 and the second hole group 341 of the second valve plate 34 in sequence; when the gas blows from the second valve plate 34 to the first valve plate 31, the valve flaps 322 of the valve piece 32 will be pressed against the surface of the first valve plate 31 to block the first hole group 311, thereby realizing the one-way flow of the gas.

[0045] In this embodiment, as Figure 2 and Figure 3 shown, the pump body 1 includes a lower cover 11 and an upper cover 12 arranged oppositely. The lower cover 11 and the upper cover 12 are respectively pressed and fixed on both sides of the outer peripheral edge of the flexible circuit board 21; the intake air flow channel 13 and the exhaust air flow channel 14 are respectively arranged on the lower cover 11 and the upper cover 12, and the central connection line of the intake air flow channel 13 and the exhaust air flow channel 14 coincides with the connection line of the wave crests and wave troughs during the vibration of the piezoelectric ceramic assembly 2.

[0046] During the vibration of the piezoelectric ceramic component 2, the vibration amplitude at its central position is the largest. By arranging the intake air passage 13 and the exhaust air passage 14 corresponding to the central position of the piezoelectric ceramic sheet 22, the vibration energy of the piezoelectric ceramic sheet 22 can be maximally utilized to promote the inhalation and exhaust of gas, thereby improving the working efficiency of the pump. Since the intake air passage 13 and the exhaust air passage 14 are arranged corresponding to the peaks and valleys of the piezoelectric ceramic sheet 22, at this time, the first one-way valve 3 and the second one-way valve 4 arranged at the intake air passage 13 and the exhaust air passage 14 have the best working efficiency under the influence of the vibration of the piezoelectric ceramic component 2.

[0047] In this embodiment, as Figure 4 shown, mounting ring grooves 17 are provided at one ends of the intake air passage 13 and the exhaust air passage 14 facing the piezoelectric ceramic component 2. A glue-sealing ring groove 18 is formed in the outer ring of the notch of the mounting ring groove 17. The first one-way valve 3 and the second one-way valve 4 are respectively arranged in the mounting ring 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 ring grooves 17, their peripheries are glue-sealed through the glue-sealing ring grooves 18, ensuring the installation stability of the one-way valves and further improving their sealing performance.

[0048] Furthermore, a plurality of air holes 19 are provided at one ends of the intake air passage 13 and the exhaust air passage 14 far from the piezoelectric ceramic sheet 22, and the air holes 19 are all arranged in a honeycomb shape. The honeycomb-shaped air hole 19 structure enables the gas to be dispersed into multiple fine streamlets when passing through, so that larger impurities and particulate matters in the gas will be blocked outside the air holes 19 and cannot enter the inside of the pump body 1, thereby reducing the risk of performance attenuation or failure of the one-way valve and the piezoelectric component.

[0049] Those skilled in the art should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A gas delivery device, characterized in that: The invention comprises a pump body (1) and a piezoelectric ceramic component (2), a first one-way valve (3) and a second one-way valve (4) arranged therein, wherein the first one-way valve (3) and the second one-way valve (4) are arranged in an intake flow passage (13) and an exhaust flow passage (14) of the pump body (1), respectively. The piezoelectric ceramic component (2) separates the inner cavity of the pump body (1) into a first cavity (15) and a second cavity (16) which are connected to each other, and the intake flow channel (13) and the exhaust flow channel (14) are connected to the first cavity (15) and the second cavity (16) respectively; The piezoelectric ceramic component (2) comprises a flexible support plate (21) and a piezoelectric ceramic sheet (22) and a metal substrate (23) arranged on two sides thereof, and a through hole (214) connecting the first cavity (15) and the second cavity (16) is provided on the flexible support plate (21).

2. The gas delivery device according to claim 1, characterized in that: The through holes (214) are arranged along the circumferential direction on the outer ring of the piezoelectric ceramic component (2).

3. The gas delivery device according to claim 2, characterized in that: The flexible support plate (21) comprises a mounting portion (211), an outer ring portion (212) and a flexible hinge portion (213); the mounting portion (211) is located in the middle of the flexible support plate (21); the outer ring portion (212) is located at the edge of the outer ring 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).

4. The gas delivery device according to claim 3, characterized in that: An electrical connection component (25) is provided on the flexible support plate (21), the piezoelectric ceramic sheet (22) is provided on one side of the mounting portion (211) and is electrically connected to the electrical connection component (25), and the metal substrate (23) is bonded to the other side of the mounting portion (211) away from the piezoelectric ceramic sheet (22).

5. The gas delivery device according to claim 3, characterized in that: The through holes (214) are arranged along the circumference of the flexible hinge portion (213).

6. The gas delivery device according to any one of claims 1 to 5, characterized in that: A third one-way valve (24) is provided on the flexible support plate (21) at the through hole (214).

7. The gas delivery device according to claim 1, characterized in that: The first one-way valve (3) and the second one-way valve (4) are arranged to have the same structure, comprising a first valve plate (31), a valve sheet (32), a support ring plate (33) and a second valve plate (34) arranged in sequence along the thickness direction thereof, and the second valve plate (34) on the intake flow channel (13) and the first valve plate (31) on the exhaust flow channel (14) are both arranged toward the inner cavity of the pump body (1); Holes are opened circumferentially at the center positions 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; a plurality of valve flaps (322) distributed circumferentially are formed at the center position of the valve plate (32) through a cross-dividing line (321); the valve flaps (322) are arranged corresponding to the first hole group (311); and the first hole group (311) and the second hole group (341) are arranged in a staggered manner.

8. The gas delivery device according to claim 1, characterized in that: The pump body (1) comprises a lower cover (11) and an upper cover (12) which are arranged 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 ring edge of the flexible support plate (21); The intake flow channel (13) and the exhaust flow channel (14) are respectively arranged on the lower cover (11) and the upper cover (12), and a center line connecting the intake flow channel (13) and the exhaust flow channel (14) coincides with a line connecting the peaks and troughs of the piezoelectric ceramic component (2) when it vibrates.

9. The gas delivery device according to claim 8, characterized in that: A mounting ring groove (17) is provided at one end of the intake flow channel (13) and the exhaust flow channel (14) facing the piezoelectric ceramic component (2), a rubber sealing ring groove (18) is provided on the outer ring of the groove of the mounting ring groove (17), and the first one-way valve (3) and the second one-way valve (4) are respectively arranged in the mounting ring groove (17) of the lower cover (11) and the upper cover (12).

10. The gas delivery device according to claim 8, characterized in that: A plurality of air holes (19) are provided at one end of the intake flow channel (13) and the exhaust flow channel (14) away from the piezoelectric ceramic sheet (22), and the air holes (19) are arranged in a honeycomb shape.

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