Air pump structure

Abstract

The utility model relates to the technical field of electrically-driven pumps, in particular to an air pump structure 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 structure 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 actuator arranged in the containing cavity is elastically supported on the bottom 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. According to the air pump structure, the resonance part and the elastic supporting part are arranged on the two plate bodies, stress concentration is reduced, and therefore the risk that the resonance partition plate is separated from the bottom wall is reduced, the service life is prolonged, and reliability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pumps with electric drive, in particular to an air pump structure. 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 4 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 23 between the elastic support portion 4 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 makes the connection area between the resonance plate and the bottom wall easy to fall off, the utility model provides an air pump structure. By arranging the resonance part and the elastic support part on two plates, stress concentration is reduced, the risk of separation between the resonance plate and the bottom wall is reduced, and reliability is enhanced.

[0005] The utility model provides an air pump structure, 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 a first hole part that is connected to the first air cavity is provided on the top wall, wherein the actuator placed in the accommodating cavity is elastically supported on the bottom 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, and wherein a second hole part that is connected to the second air cavity is provided on the resonance part. By adding the resonance baffle, a part of the impact load received by the elastic supporting part on the bottom wall is shared, so as to reduce the risk of the resonance baffle and the bottom wall being 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 or the second 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 second main surface of the substrate is provided with a plurality of connecting bosses, the resonance partition also has a part which is a fixing portion connected to the bottom wall, the fixing portion is located at the periphery of the resonance portion, the area opposite to the fixing portion and the connecting boss has an avoidance hole, through which the connecting boss can pass and be elastically supported on the bottom wall, and the fixing portion is fixedly connected to the side wall. The fixing portion is placed between the side wall and the bottom wall and is substantially fixed, and the resonance portion can perform bending vibration.

[0008] Furthermore, the bottom wall has a notch in the area opposite to the connecting boss, an elastic support portion is formed in the notch, the connecting boss is fixedly connected to the elastic support portion opposite to the bottom wall, and the bottom wall is fixedly connected to the fixed portion of the resonance partition. The substrate is elastically supported on the bottom wall by the elastic support portion in a manner that a second air cavity is provided between the substrate and the bottom wall.

[0009] Furthermore, the elastic support part includes a support plate and a connecting rod, the support plate is fixedly arranged in the notch through the connecting rod, the connecting boss is fixedly arranged on the support plate, the middle part of the bottom wall has a first opening part opposite to the resonance part, and the elastic support part is arranged around the periphery of the first opening part. The deformation of the resonance part is avoided through the first opening part.

[0010] Furthermore, a guide plate is provided on the side of the bottom wall away from the second air cavity, and a second opening portion opposite to the resonance portion is provided in the middle of the guide plate, and the second opening portion is connected to the second hole portion. The second opening portion that penetrates the first opening portion avoids deformation of the resonance portion.

[0011] Furthermore, a groove is provided in the area of ​​the guide plate corresponding to the elastic support part, so as to avoid the elastic support part from deforming.

[0012] Further, the joint area between the bottom wall and the guide plate is an outer joint area and an inner joint area, the outer joint area is arranged around the circumference of the inner joint area, the inner joint area is arranged around the circumference of the resonance part, and the groove part is located between the outer joint area and the inner joint area, so as to avoid the elastic support part from forming motion interference with the guide plate when the actuator vibrates.

[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 protective part is a breathable and lightweight plate-shaped or film-shaped protective part, and the protective part can be a sponge board, a rock wool board or a porous breathable film. The breathability can ensure the circulation of gas, and the lightness will not introduce a large additional mass, ensuring that the amplitude of the actuator will not be weakened.

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

[0016] The utility model provides an air pump structure, which can reduce stress concentration by arranging the elastic support part and the vibration part on the bottom wall and the resonance partition plate, avoid the easy falling off phenomenon caused by the vibration of the center and edge elastic areas of the traditional resonance plate, ensure the firmness of the connection between the resonance partition plate and the bottom wall, thereby effectively improving the stability 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 the structure of a conventional air pump;

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

[0020] Figure 3 It is a schematic diagram of the internal structure of the air pump;

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

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

[0023] In the figure, 1. shell, 11. top wall, 111. first hole portion, 12. bottom wall, 121. notch, 122. first 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, 23. connecting boss, 3. resonance partition, 31. resonance portion, 32. second hole portion, 33. fixing portion, 331. avoidance hole, 4. elastic support portion, 41. support plate, 42. connecting rod, 5. guide plate, 51. second opening portion, 52. groove portion, 6. protection portion, 10. resonance plate. 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 glue joints 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 the stable use of the air pump, an air pump structure 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 bottom wall 12. 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, and 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. The top wall 11 and the bottom wall 12 are not limited to single-layer plates, but can also be composed of multi-layer plates. When the actuator 2 vibrates, the pressure change in the first air cavity 14 causes the elastic support part 4 to vibrate, and the pressure change in the second air cavity 15 causes the resonance part 31 of the resonance diaphragm 3 to vibrate. The elastic support part 4 and the resonance part 31 are arranged on two plates, so that the impact load can be dispersed to avoid stress concentration, and the firmness of the adhesive joint between the resonance diaphragm 3 and the bottom wall 12 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 6 can be provided. The protective part 6 is located in the first air cavity 14 and is arranged opposite to the actuator 2. The protective part 6 is in contact with the piezoelectric ceramic sheet 22 but not fixed 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] The protective part 6 is a breathable and lightweight plate-shaped or film-shaped protective part 6, and the protective part 6 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 6 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] A guide plate 5 is also provided on the side of the bottom wall 12 away from the second air cavity 15. The middle of the guide plate 5 has a second opening portion 51 opposite to the resonance portion 31, and the second opening portion 51 is connected to the second hole portion 32. A groove portion 52 is provided on the guide plate 5 in the area corresponding to the elastic support portion 4, which is used to avoid the elastic support portion 4. The joint area between the bottom wall 12 and the guide plate 5 is an outer joint area and an inner joint area. The outer joint area is arranged around the circumference of the inner joint area, and the inner joint area is arranged around the circumference of the resonance portion 31. The groove portion 52 is located between the outer joint area and the inner joint area to avoid the elastic support portion 4, so as to prevent the elastic support portion 4 from interfering with the movement of the guide plate 7 when the actuator 2 vibrates.

[0031] like Figure 4 and 5 As shown, the actuator 2 includes a substrate 21 and a piezoelectric ceramic piece 22. The substrate 21 can be, but is not limited to, circular, square, polygonal or elliptical, etc. Taking the substrate 21 as a circular plate as an example, the substrate 21 has a first main surface 211 and a second main surface 212 arranged opposite to each other in the thickness direction thereof. The piezoelectric ceramic piece 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 portion 111 is opposite to the piezoelectric ceramic piece 22. The piezoelectric ceramic piece 22 can also be bonded to the second main surface of the substrate 4. In this embodiment, the piezoelectric ceramic piece 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 piece 22 causes the substrate 21 to bend and vibrate, thereby causing the actuator 2 to bend and vibrate.

[0032] The second main surface 212 of the substrate 21 is provided with a plurality of connecting bosses 23. The resonance partition 3 also has a fixing portion 33 which is partially connected to the bottom wall 12. The fixing portion 33 is located outside the resonance portion 31. The fixing portion 33 has an avoidance hole 331 in the area opposite to the connecting boss 23, through which the connecting boss 23 can pass and be elastically supported on the bottom wall 12. The fixing portion 33 is fixedly connected to the side wall 13. The connecting boss 23 can be integrally formed with the substrate 21, and all the connecting bosses 23 can be evenly distributed on the second main surface 212 of the substrate 21 along the circumferential direction.

[0033] The area of ​​the bottom wall 12 opposite to the connecting boss 23 has a notch 121, an elastic support portion 4 is formed in the notch 121, the connecting boss 23 is fixedly connected to the elastic support portion 4 opposite thereto, and the bottom wall 12 is fixedly connected to the fixing portion 33 of the resonance partition 3. The notch 121 can be formed by local etching or laser cutting, and the connecting boss 23 is fixedly connected to the elastic support portion 4 opposite thereto, so that the substrate 21 is elastically supported on the bottom wall 12 in a manner that a second air cavity 15 is provided between the substrate 21 and the bottom wall 12. The size of the second air cavity 15 can also be adjusted by adjusting the thickness of the resonance partition 3.

[0034] The elastic support part 4 includes a support plate 41 and a connecting rod 42. The support plate 41 is fixedly arranged in the notch 121 through the connecting rod 42. The connecting rod 42 can be one or more, as long as the support plate 41 has an elastic effect. The connecting boss 23 is fixedly arranged on the support plate 41. The middle part of the bottom wall 12 has a first opening 122 opposite to the resonance part 31. The elastic support part 4 is arranged around the periphery of the first opening 122. The shape of the support plate 41 matches that of the connecting boss 23, and the glue is used to stabilize the bonding.

[0035] 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 structure, 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 part 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 (111) connected to the first air cavity (14); the actuator (2) placed in the accommodating cavity is elastically supported on the bottom wall (12); 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 (32) connected to the second air cavity (15).

2. An air pump structure according to claim 1, characterized in that: The actuator (2) includes 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 piezoelectric ceramic sheet (22).

3. An air pump structure according to claim 2, characterized in that: The second main surface (212) of the substrate (21) is provided with a plurality of connecting bosses (23); the resonance partition plate (3) further comprises a fixing portion (33) which is partially connected to the bottom wall (12); the fixing portion (33) is located at the periphery of the resonance portion (31); an avoidance hole (331) is provided in the area where the fixing portion (33) and the connecting boss (23) are opposite, through which the connecting boss (23) can pass and be elastically supported on the bottom wall (12); the fixing portion (33) is fixedly connected to the side wall (13).

4. An air pump structure according to claim 3, characterized in that: The bottom wall (12) has a notch (121) in an area opposite to the connecting boss (23), an elastic support portion (4) is formed in the notch (121), the connecting boss (23) is fixedly connected to the corresponding elastic support portion (4), and the bottom wall (12) is fixedly connected to the fixing portion (33) of the resonance partition (3).

5. An air pump structure according to claim 4, characterized in that: The elastic support portion (4) comprises a support plate (41) and a connecting rod (42); the support plate (41) is fixedly arranged in the notch (121) via the connecting rod (42); the connecting boss (23) is fixedly arranged on the support plate (41); a first opening portion (122) opposite to the resonance portion (31) is provided in the middle of the bottom wall (12); and the elastic support portion (4) is arranged around the periphery of the first opening portion (122).

6. An air pump structure according to claim 5, characterized in that: A guide plate (5) is also provided on the side of the bottom wall (12) facing away from the second air cavity (15); a second opening portion (51) opposite to the resonance portion (31) is provided in the middle of the guide plate (5); and the second opening portion (51) is connected to the second hole portion (32).

7. An air pump structure according to claim 6, characterized in that: A groove (52) is provided in an area on the guide plate (5) corresponding to the elastic support portion (4) for avoiding the elastic support portion (4).

8. An air pump structure according to claim 7, characterized in that: The joining area between the bottom wall (12) and the guide plate (5) is an outer joining area and an inner joining area, the outer joining area is arranged around the circumference of the inner joining area, the inner joining area is arranged around the circumference of the resonance part (31), and the groove part (52) is located between the outer joining area and the inner joining area.

9. An air pump structure according to claim 2, characterized in that: It also includes a protective portion (6), which is located in the first air cavity (14) and arranged opposite to the actuator (2), and the protective portion (6) is arranged on the piezoelectric ceramic sheet (22) in a contacting but not fixed manner.

10. An air pump structure according to claim 9, characterized in that: The protective part (6) is a breathable and lightweight plate-shaped or film-shaped protective part (6), and the protective part (6) can be a sponge board, a rock wool board or a porous breathable film.

Images