Air pump

Abstract

The utility model relates to the technical field of electrically driven pumps, in particular to an air pump which comprises a shell and an actuator, the shell comprises a top wall, a bottom wall and a side wall, the top wall and the bottom wall are oppositely arranged, the side wall is connected between the top wall and the bottom wall, a containing cavity is defined by the top wall, the bottom wall and the side wall, the actuator is arranged in the containing cavity, and the air pump further comprises a resonance partition plate. A part of the resonance partition plate forms a resonance part, a first air cavity is formed between the actuator and the top wall, the top wall is provided with a first hole part communicated with the first air cavity, the actuator arranged in the containing cavity is elastically supported on the top wall, the resonance partition plate is arranged between the actuator and the bottom wall, and a second air cavity is formed between the resonance partition plate and the actuator. The resonance part of the resonance partition plate is arranged opposite to the actuator, and the resonance part is provided with a second hole part communicated with the second air cavity. According to the air pump, the resonance part and the elastic supporting part are arranged separately, the connecting area of the related part is increased, the area of the vibration area of the resonance partition plate is reduced, and therefore stress concentration is reduced, the risk that the resonance partition plate, the bottom wall, the elastic supporting part and the actuator are prone to disengagement is reduced, and reliability is enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of pumps with electric drive, in particular to an air pump. Background Art

[0002] The piezoelectric micro air pump mainly utilizes the inverse piezoelectric effect of piezoelectric ceramics, which is driven by electrical signals and converted into mechanical deformation, resulting in a rapid change in the volume of gas in a confined space, generating high-pressure, high-speed airflow at tiny air outlets, and utilizing the Venturi effect to produce a stable airflow output.

[0003] After searching, the patent with the announcement number CN117531682B discloses a frequency-stabilized transducer assembly and a gas generating device, including a substrate, a piezoelectric ceramic sheet, a resonance plate, a first plate group and a second plate group. By simultaneously arranging the first plate group and the second plate group with a larger linear expansion coefficient on both sides of the resonance plate, the resonance plate and the actuator are always roughly in a stable shape when the temperature changes. However, in actual use, it is found that, as shown in the attached Figure 1 As shown, a resonance portion 31 is provided at the center of the resonance plate 10, and elastic support portions 20 are provided around the resonance plate 10. The adhesive connection points between the substrate 21 and the resonance plate 10 are only on the connecting bosses 30 between the elastic support portion 20 and the substrate 21. Under the excitation of an external electrical signal, the actuator is deformed, and the elastic areas at the center and edge of the resonance plate 10 vibrate, which causes the resonance plate to easily fall off from the bottom wall and has poor stability, thus affecting the normal use of the air pump. Utility Model Content

[0004] In order to solve the problem that the existing resonance part and the elastic support part are both arranged on the same plate body, which causes the connection area between the resonance plate and the bottom wall to fall off easily, the utility model provides an air pump. By arranging the resonance part and the elastic support part on two plates, the bonding area is increased, the stress concentration is reduced, the risk of easy separation between the resonance plate and the bottom wall is reduced, and the reliability is enhanced.

[0005] The utility model provides an air pump, including a shell and an actuator, wherein the shell includes a top wall and a bottom wall that are arranged opposite to each other, and a side wall connected between the top wall and the bottom wall, wherein the top wall, the bottom wall and the side wall enclose an accommodating cavity, wherein the actuator is placed in the accommodating cavity, and further includes a resonance baffle, wherein a part of the resonance baffle is formed as a resonance part, wherein a first air cavity is formed between the actuator and the top wall, wherein the top wall has a first hole part that is connected to the first air cavity, wherein the actuator placed in the accommodating cavity is elastically supported on the top wall, wherein the resonance baffle is arranged between the actuator and the bottom wall, and a second air cavity is formed between the resonance baffle and the actuator, wherein the resonance part of the resonance baffle is arranged opposite to the actuator, wherein the resonance part has a second hole part that is connected to the second air cavity, and an opening part is arranged in the area of ​​the bottom wall opposite to the resonance part. The resonance part and the elastic support part are arranged on two plates, thereby increasing the bonding area, reducing stress concentration, and reducing the risk of the resonance plate and the bottom wall being easily separated.

[0006] Furthermore, the actuator includes a substrate and a piezoelectric ceramic sheet, the substrate has a first main surface and a second main surface, the piezoelectric ceramic sheet is bonded to the first main surface of the substrate and causes the actuator to bend and vibrate, and the first hole portion is opposite to the piezoelectric ceramic sheet. Under the excitation of an external periodic electrical signal, the piezoelectric ceramic sheet causes the substrate to bend and vibrate, thereby causing the actuator to bend and vibrate.

[0007] Furthermore, the actuator is fixedly connected to the top wall via an elastic member, one side of the elastic member is fixedly connected to the top wall, and the other side is fixedly connected to the base plate. The elastic member stably connects the actuator and enables it to have elastic deformation capability.

[0008] Furthermore, the elastic member is an elastic ring or an elastic sheet circumferentially arranged on the outer edge of the substrate. Both the elastic ring and the elastic sheet can realize the vibration bending of the actuator.

[0009] Furthermore, the elastic member is an elastic ring, and the diameter of the elastic ring decreases from the top wall side to the substrate side. The elastic ring with a trapezoidal cross section has better connection strength and high reliability.

[0010] Furthermore, flanges are provided on both fixed end surfaces of the elastic member, the flange connected to the top wall is bent away from the piezoelectric ceramic sheet, and the flange connected to the substrate is bent toward the piezoelectric ceramic sheet. The flange is a complete ring, which substantially increases the bonding area with the top wall and the substrate, and improves stability and reliability.

[0011] Furthermore, the elastic member is provided with at least one air hole for connecting the first air cavity and the second air cavity. The provision of the air hole facilitates air circulation.

[0012] Furthermore, the resonance partition also has a fixed portion connected to the bottom wall, the fixed portion is located outside the resonance portion, and the fixed portion is fixedly connected to the side wall. The fixed portion is placed between the side wall and the bottom wall and is substantially fixed, so that the resonance portion can perform bending vibration.

[0013] Furthermore, it also includes a protection part, which is located in the first air cavity and arranged opposite to the actuator, and the protection part is in contact with the piezoelectric ceramic sheet but not fixedly arranged. The protection part is arranged in the first air cavity without being constrained, and the protection part is used to contact the top wall and the piezoelectric ceramic sheet.

[0014] Furthermore, the elastic member is connected to the top wall and the base plate respectively by adhesive, and the adhesive is a low modulus adhesive, and the modulus of the low modulus adhesive is not greater than 1.5 GPa. The use of adhesive with low modulus characteristics for bonding ensures temperature stability.

[0015] The beneficial effects of the utility model are:

[0016] The utility model provides an air pump, which increases the bonding area by arranging an elastic support part and a vibration part on an elastic ring and a resonance partition plate, reduces stress concentration, avoids the easy falling-off phenomenon caused by vibration of the center and edge elastic areas of a traditional resonance plate, ensures the firmness of the connection between the resonance partition plate and the bottom wall, and effectively improves the use stability and service life of the air pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of a conventional air pump;

[0019] Figure 2 is an external schematic diagram of the air pump;

[0020] Figure 3 This is a schematic diagram of the inside of the air pump;

[0021] Figure 4 This is a first-person exploded view of the air pump;

[0022] Figure 5 This is an exploded view of the air pump from the second perspective;

[0023] In the figure, 1. shell, 11. top wall, 111. first hole portion, 12. bottom wall, 121. opening portion, 13. side wall, 14. first air cavity, 15. second air cavity, 2. actuator, 21. substrate, 211. first main surface, 212. second main surface, 22. piezoelectric ceramic sheet, 3. resonance diaphragm, 31. resonance portion, 32. second hole portion, 33. fixing portion, 4. elastic member, 41. flange, 42. air hole, 5. protective portion, 10. resonance plate, 20. elastic support portion, 30. connecting boss. DETAILED DESCRIPTION

[0024] The technical solution of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all of the embodiments.

[0025] like Figure 1 As shown, the resonance part 31 and the elastic support part 4 in the traditional air pump are both arranged on the resonance plate 10, so that the resonance plate 10 is subjected to a large impact load, which is prone to flexural deformation and may also cause the connection area between the elastic support part 4 of the resonance plate 10 and the connecting boss 23 of the base plate 21 to fall off, affecting the normal use of the air pump.

[0026] In order to ensure reliable connection of the air pump, an air pump is designed, such as Figure 2 and 3 As shown, the housing 1 includes a housing 1 and an actuator 2. The housing 1 includes a top wall 11 and a bottom wall 12 that are arranged opposite to each other, and a side wall 13 connected between the top wall 11 and the bottom wall 12. The top wall 11, the bottom wall 12 and the side wall 13 form an accommodating cavity. The actuator 2 is placed in the accommodating cavity. The housing 1 also includes a resonance baffle 3. A part of the resonance baffle 3 is formed as a resonance portion 31. A first air cavity 14 is formed between the actuator 2 and the top wall 11. The top wall 11 has a first hole portion 111 that is connected to the first air cavity 14. The actuator 2 placed in the accommodating cavity is elastically supported on the top wall 11. The resonance baffle 3 is arranged between the actuator 2 and the bottom wall 12, and a second air cavity 15 is formed between the resonance baffle 3 and the actuator 2. The resonance portion 31 of the resonance baffle 3 is arranged opposite to the actuator 2. The resonance portion 31 has a second hole portion 32 that is connected to the second air cavity 15.

[0027] The housing 1 is a housing 1 that is a laminate of a plurality of flat plate-shaped components stacked in a specified direction. In this embodiment, the top wall 11, the bottom wall 12 and the side wall 13 are all formed as flat plate-shaped components, which are stacked in the thickness direction to define a first air cavity 14 and a second air cavity 15 inside, wherein the top wall 11 and the bottom wall 12 are single-layer plates or multi-layer plate structures stacked. When the actuator 2 vibrates, the pressure change in the first air cavity 14 causes the elastic member 4 to vibrate, and the pressure change in the second air cavity 15 causes the resonance part 31 of the resonance partition 3 to vibrate. The elastic support part 20 and the resonance part 31 are arranged separately, so that the impact load received can be dispersed, stress concentration can be avoided, and the firmness of the adhesive joint between the actuator 2 and the top wall 11 can be ensured, thereby ensuring the stable operation of the air pump.

[0028] In order to further ensure the stability of the air pump, a protective part 5 can also be provided. The protective part 5 is located in the first air cavity 14 and is arranged opposite to the actuator 2. The protective part 5 is in contact with the piezoelectric ceramic sheet 22 but not fixedly arranged thereon. This can prevent the actuator 2 from producing plastic deformation and causing the static position of the actuator 2 to change, thereby preventing failure or performance degradation.

[0029] Specifically, the protective part 5 is a breathable and lightweight plate-shaped or film-shaped protective part 5, and the protective part 5 can be a sponge board, a rock wool board or a porous breathable film. By using a lightweight and porous breathable film-shaped or thin plate-shaped protective part 5 to cover a part or the whole of the actuator 2 in a contacting but not fixed manner to form a protective structure, the impact resistance of the air pump is improved, and the internal gas flow and vibration characteristics of the air pump are not substantially affected.

[0030] like Figure 4 and 5As shown, the actuator 2 includes a substrate 21 and a piezoelectric ceramic sheet 22. The substrate 21 has a first main surface 211 and a second main surface 212. The piezoelectric ceramic sheet 22 is bonded to the first main surface 211 of the substrate 21 and causes the actuator 2 to bend and vibrate. The first hole 111 is opposite to the piezoelectric ceramic sheet 22. In this embodiment, the piezoelectric ceramic sheet 22 is bonded to the first main surface 211 of the substrate 21. Under the excitation of an external periodic electrical signal, the piezoelectric ceramic sheet 22 causes the substrate 21 to bend and vibrate, thereby causing the actuator 2 to bend and vibrate.

[0031] The actuator 2 is fixedly connected to the top wall 11 through the elastic member 4. One side of the elastic member 4 is fixedly connected to the top wall 11, and the other side is fixedly connected to the substrate 21. Under the excitation of the external periodic electrical signal, the piezoelectric ceramic piece 22 causes the substrate 21 to bend and vibrate, thereby causing the actuator 2 to bend and vibrate, and the elastic member 4 deforms along with the actuator 2.

[0032] The elastic member 4 is an elastic ring or an elastic sheet circumferentially arranged on the outer edge of the base plate 21, and can also be any structure that can be elastically deformed. Preferably, the elastic member 4 is an elastic ring. When the elastic ring is glued to the top wall 11, the glue is in a ring shape. Compared with the point-break glue of the elastic sheet, the bonding firmness of the ring glue is better. The diameter of the elastic ring decreases from the top wall 11 side to the base plate 21 side. The elastic ring structure with a trapezoidal cross section has higher strength.

[0033] In order to further enhance the bonding strength, flanges 41 are provided on both fixed end surfaces of the elastic member 4. The flanges 41 connected to the top wall 11 are bent away from the piezoelectric ceramic sheet 22, and the flanges 41 connected to the substrate 21 are bent toward the piezoelectric ceramic sheet 22. The provision of the flanges 41 can increase the area of ​​the glue coating and improve the firmness.

[0034] In order to ensure air circulation, the elastic member 4 is provided with at least one air hole 42 for connecting the first air cavity 14 and the second air cavity 15 .

[0035] The resonance partition 3 also has a fixed portion 33 partially connected to the bottom wall 12, the fixed portion 33 is located outside the resonance portion 31, and the fixed portion 33 is fixedly connected to the side wall 13. The fixed portion 33 is placed between the side wall 13 and the bottom wall 12 and is substantially fixed, so that the resonance portion 31 can perform bending vibration.

[0036] In order to adjust the size of the second air cavity 15, a spacer 5 is further provided between the resonance baffle 3 and the side wall 13. Spacers 5 of different thicknesses can adjust the height of the air cavity, that is, adjust the size of the air cavity, thereby changing the functional characteristics of the air pump to meet the needs of different application scenarios.

[0037] Preferably, the elastic member 4 is connected to the top wall 11 and the base plate 21 respectively by adhesive, and the adhesive is a low modulus adhesive to reduce stress transfer between the joint surfaces when the temperature changes, and the modulus of the low modulus adhesive is not greater than 1.5 Gpa.

[0038] The above description is only illustrative rather than restrictive of the present invention. Those skilled in the art will understand that many modifications, changes or equivalents may be made without departing from the spirit and scope defined by the appended claims, but all will fall within the scope of protection of the present invention.

Claims

1. An air pump, comprising a housing (1) and an actuator (2), wherein the housing (1) comprises a top wall (11) and a bottom wall (12) arranged opposite to each other, and a side wall (13) connected between the top wall (11) and the bottom wall (12), wherein the top wall (11), the bottom wall (12) and the side wall (13) form a receiving cavity, and the actuator (2) is placed in the receiving cavity. Features: It also includes a resonance baffle (3), a portion of which is formed as a resonance portion (31). A first air cavity (14) is formed between the actuator (2) and the top wall (11); the top wall (11) has a first hole portion (111) connected to the first air cavity (14); the actuator (2) placed in the accommodating cavity is elastically supported on the top wall (11); the resonance baffle (3) is arranged between the actuator (2) and the bottom wall (12), and a second air cavity (15) is formed between the resonance baffle (3) and the actuator (2); a resonance portion (31) of the resonance baffle (3) is arranged opposite to the actuator (2); the resonance portion (31) has a second hole portion (32) connected to the second air cavity (15); and an opening portion (121) is provided in a region of the bottom wall (12) opposite to the resonance portion (31).

2. An air pump according to claim 1, characterized in that: The actuator (2) comprises a substrate (21) and a piezoelectric ceramic sheet (22), wherein the substrate (21) has a first main surface (211) and a second main surface (212), the piezoelectric ceramic sheet (22) is bonded to the first main surface (211) or the second main surface (212) of the substrate (21) and causes the actuator (2) to bend and vibrate, and the first hole portion (111) is opposite to the actuator (2).

3. An air pump according to claim 2, characterized in that: The actuator (2) is fixedly connected to the top wall (11) via an elastic member (4); one side of the elastic member (4) is fixedly connected to the top wall (11), and the other side of the elastic member (4) is fixedly connected to the base plate (21).

4. An air pump according to claim 3, characterized in that: The elastic member (4) is an elastic ring or an elastic sheet circumferentially arranged on the outer edge of the base plate (21).

5. An air pump according to claim 4, characterized in that: The elastic member (4) is an elastic ring, and the diameter of the elastic ring decreases from the top wall (11) side to the base plate (21) side.

6. An air pump according to claim 4, characterized in that: Both fixed end surfaces of the elastic member (4) are provided with flanges (41); the flange (41) connected to the top wall (11) is bent away from the piezoelectric ceramic sheet (22), and the flange (41) connected to the substrate (21) is bent toward the piezoelectric ceramic sheet (22).

7. An air pump according to claim 4, characterized in that: The elastic member (4) is provided with at least one air hole (42) for connecting the first air cavity (14) and the second air cavity (15).

8. An air pump according to claim 1, characterized in that: The resonance partition plate (3) further comprises a fixing portion (33) partially connected to the bottom wall (12), the fixing portion (33) being located outside the resonance portion (31), and the fixing portion (33) being fixedly connected to the side wall (13).

9. An air pump according to claim 8, characterized in that: It also comprises a protection part (5), the protection part (5) being located in the first air cavity (14) and arranged opposite to the actuator (2), the protection part (5) being arranged on the piezoelectric ceramic sheet (22) in a contacting but not fixed manner.

10. An air pump according to claim 3, characterized in that: The elastic member (4) is connected to the top wall (11) and the base plate (21) respectively by means of an adhesive, wherein the adhesive is a low modulus adhesive, and the modulus of the low modulus adhesive is not greater than 1.5 GPa.

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