Piezoelectric air pump and equipment provided with piezoelectric air pump

Abstract

The utility model relates to a piezoelectric air pump (100) which is characterized by comprising a piezoelectric air pump main body part (1) and a silencing mechanism, the silencing mechanism is provided with a plurality of silencing cavities, the silencing cavities comprise at least one air inlet silencing cavity (2) and / or at least one air outlet silencing cavity (3), and under the condition that the silencing cavities comprise the at least one air inlet silencing cavity (2), the air inlet silencing cavity (2) and / or the at least one air outlet silencing cavity (3) are communicated with each other. An air inlet of the piezoelectric air pump main body part (1) is connected with an air outlet end of the at least one air inlet silencing cavity (2), and an air outlet of the piezoelectric air pump main body part (1) is connected with an air inlet end of the at least one air outlet silencing cavity (3) under the condition that the silencing cavities comprise the at least one air outlet silencing cavity (3).

Description

TECHNICAL FIELD

[0001] The utility model relates to piezoelectric air pump field, more specifically, the utility model relates to a piezoelectric air pump and the equipment with piezoelectric air pump. BACKGROUND

[0002] The piezoelectric pump is a new type of fluid driver, which is usually composed of a piezoelectric vibrator, a pump valve and a pump body. The piezoelectric pump does not need an additional driving motor, but uses the inverse piezoelectric effect of the piezoelectric ceramic to make the piezoelectric vibrator deform, and then the deformation generates a volume change of the pump cavity to realize the output of fluid including gas or uses the piezoelectric vibrator to generate fluctuation to transmit fluid including liquid.

[0003] More specifically, in the working of the piezoelectric pump, when an alternating current power is applied to both ends of the piezoelectric vibrator, the piezoelectric vibrator is compressed radially under the action of the electric field, and tensile stress is generated inside, so that the piezoelectric vibrator is bent and deformed. When the piezoelectric vibrator is bent in the positive direction, the piezoelectric vibrator is elongated, the volume of the pump cavity is increased, the fluid pressure in the cavity is reduced, the pump valve is opened, and the fluid enters the pump cavity; when the piezoelectric vibrator is bent in the reverse direction, the piezoelectric vibrator is contracted, the volume of the pump cavity is reduced, the fluid pressure in the cavity is increased, the pump valve is closed, and the pump cavity fluid is extruded and discharged, forming a pulsating flow.

[0004] When the above fluid is gas, the piezoelectric pump is a piezoelectric air pump, and the piezoelectric vibrator inside the piezoelectric air pump reciprocates after being connected to an alternating current. The gas is driven by the reciprocating vibration to flow forward. When the piezoelectric vibrator emits ultrasonic waves during the vibration and power-on process, there is usually no perceptible noise; but during the short period of starting and stopping inflation, the opening and closing of the valve in the pump will produce obvious noise, which will be transmitted through the air inlet and air outlet. Such switching noise often affects the user experience of the product, and in many fields such as medical devices, smart home, especially electronic products in night application scenarios, it is required that the noise of the piezoelectric air pump be as small as possible, and preferably achieve a mute effect.

[0005] Therefore, there is an urgent need in the industry for a silencing mechanism for a piezoelectric air pump to improve the mute effect of the piezoelectric air pump. UTILITY MODEL CONTENTS

[0006] In view of the above noise elimination problem of the existing piezoelectric air pump, the researchers in the field have conducted in-depth research and development, and proposed a piezoelectric air pump. The structure of connecting the silencing cavity to at least one of the air inlet and air outlet of the piezoelectric air pump effectively eliminates the working noise of the piezoelectric air pump.

[0007] According to one aspect of the present application, a piezoelectric air pump is provided, characterized in that: comprising a piezoelectric air pump main body and a sound attenuation mechanism, wherein the sound attenuation mechanism has: a plurality of sound attenuation cavities, including at least one air inlet sound attenuation cavity and / or at least one air outlet sound attenuation cavity, in the case of the plurality of sound attenuation cavities including the at least one air inlet sound attenuation cavity, the air inlet of the piezoelectric air pump main body is connected with the air outlet end of the at least one air inlet sound attenuation cavity, in the case of the plurality of sound attenuation cavities including the at least one air outlet sound attenuation cavity, the air outlet of the piezoelectric air pump main body is connected with the air inlet end of the at least one air outlet sound attenuation cavity.

[0008] According to another aspect of the present application, a device provided with a piezoelectric air pump is provided, characterized in that: comprising the above piezoelectric air pump.

[0009] By connecting the sound attenuation cavity to at least one of the air inlet and air outlet of the piezoelectric air pump as described above, the pulsating air flow of the piezoelectric air pump is buffered in the sound attenuation cavity to be greatly flattened, and the audible domain noise generated for a short time during the operation of the pump, especially during opening and closing, is eliminated by interference and multiple reflections in the sound attenuation cavity and changes in pipe cross-sectional area, etc. Most of the sound energy is eliminated, thereby effectively eliminating noise and achieving excellent mute effect. BRIEF DESCRIPTION OF DRAWINGS

[0010] The accompanying drawings, which form a part of the specification, illustrate embodiments of the present application and, together with the description, serve to explain the principles of the present application. Other embodiments of the present application will be apparent to those skilled in the art from consideration of the drawings and detailed description thereof.

[0011] With reference to the drawings, the present application can be more clearly understood from the following detailed description.

[0012] Figure 1 is an exemplary schematic diagram showing the structure of a conventional piezoelectric air pump.

[0013] Figure 2 is an exemplary schematic diagram showing the sound source and sound wave direction of a piezoelectric air pump.

[0014] Figure 3 is an exemplary structural schematic diagram of a sound attenuation mechanism included in a piezoelectric air pump according to an embodiment of the present application.

[0015] Figure 4 is an exemplary schematic diagram for explaining the sound attenuation principle of a sound attenuation mechanism included in a piezoelectric air pump according to an embodiment of the present application.

[0016] Figure 5 is an exemplary schematic diagram of a pipe connection method of a sound attenuation mechanism included in a piezoelectric air pump according to an embodiment of the present application.

[0017] Figure 6 Fig. 1 is an exemplary schematic diagram of a pipe connection mode of a sound muffling mechanism included in a piezoelectric air pump according to an embodiment of the present application.

[0018] Reference Signs

[0019] 1: piezoelectric air pump main body; 2: air inlet muffling cavity; 3: air outlet muffling cavity; 4: air inlet filter; 5a: air inlet connecting pipe; 5b: air outlet connecting pipe; 5c: filter connecting pipe; 6: micro valve; 7: vibrating plate; 100: piezoelectric air pump. DETAILED DESCRIPTION

[0020] The preferred embodiments of the present application will be described in detail below with reference to the drawings. It should be noted that the relative arrangement, numerical expressions, and numerical values of the components and the like set forth in these embodiments are not limiting to the scope of the present application unless otherwise specifically stated. Meanwhile, the dimensions of the respective parts shown in the drawings are not drawn in accordance with the actual proportional relationship for the convenience of description. The following description of at least one exemplary embodiment is merely illustrative and not intended to be limiting to the present application and its application or use.

[0021] Techniques, methods, and apparatus known to those of ordinary skill in the relevant art can not be discussed in detail herein, but should be considered as part of the specification, where appropriate.

[0022] First, referring to Figure 1 , an exemplary configuration example of a main body structure of a conventional piezoelectric air pump will be described. In Figure 1 , (a) shows a schematic front view of a conventional piezoelectric air pump, (b) shows a schematic top view of the conventional piezoelectric air pump, (c) shows a schematic side view of the conventional piezoelectric air pump, and (d) shows a schematic perspective view of the overall structure of the conventional piezoelectric air pump. Among them, the exemplary conventional piezoelectric air pump can include a piezoelectric air pump main body 1, such as a piezoelectric ceramic pump, and an air inlet filter 4, the air outlet end of which can be connected to the air inlet of the piezoelectric air pump main body 1 via, for example, a filter connecting pipe 5c, and the air outlet of the piezoelectric air pump main body 1 can be connected to, for example, any other air charging and discharging component via, for example, an air outlet connecting pipe 5b.

[0023] Next, referring to Figure 2 , the sound generating mode of the piezoelectric air pump will be described. In order to illustrate the sound source and the sound wave direction, Figure 2 , a schematic sectional view of a piezoelectric ceramic pump in a piezoelectric air pump is shown. As a sound source, under the reciprocating vibration of the vibrating plate 7 of the actuator, the sound wave is propagated to the air inlet and air outlet directions, respectively, starting from the micro valve 6 as two one-way valves located on the upper and lower sides, as shown in Figure 2As shown in the arc-shaped array. As mentioned above, when the pneumatic pump emits ultrasonic waves during steady-state operation, there is usually no perceptible noise, or only a very small and negligible noise; however, at the moment of starting and stopping inflation, the operating frequency of the vibrating plate 7 fluctuates significantly, causing the opening and closing of the micro-valve 6 to generate noticeable noise, which is transmitted through the air inlet and outlet. In specific scenarios such as medical treatment and nighttime sleep, this can reduce user comfort and even lead to adverse consequences.

[0024] Through in-depth research and development, the inventors of this application have proposed a technical solution for a silencing mechanism for existing pneumatic electric pumps. Figure 3 A schematic diagram of an exemplary structure of a silencing mechanism according to an embodiment of the present invention is shown, similar to... Figure 1 The arrangement of the following diagrams is shown in the diagrams: (a) a schematic front view of a pneumatic pump 100 with a silencing mechanism according to an embodiment of the present invention; (b) a schematic top view of the pneumatic pump 100; (c) a schematic side view of the pneumatic pump 100; and (d) a schematic perspective view of the overall structure of the pneumatic pump 100.

[0025] like Figure 3 As shown, with Figure 1 The main difference from existing pneumatic pumps is the addition of an inlet silencer chamber 2 and an outlet silencer chamber 3. Specifically, regarding the silencer mechanism for a pneumatic pump 100 according to an embodiment of the present invention, wherein the pneumatic pump 100 includes a pneumatic pump body 1, the silencer mechanism may include: a plurality of silencer chambers, including at least one inlet silencer chamber 2 and at least one outlet silencer chamber 3.

[0026] For ease of explanation, Figure 3 The diagram shows a structure with both an inlet silencer chamber 2 and an outlet silencer chamber 3. However, the silencer mechanism according to embodiments of this utility model can be configured to have only an inlet silencer chamber 2 or only an outlet silencer chamber 3; that is, having at least one of the inlet silencer chamber 2 and the outlet silencer chamber 3 is sufficient. When the plurality of silencer chambers includes at least one inlet silencer chamber 2, the air inlet of the piezoelectric pump body 1 is connected to the air outlet of the at least one inlet silencer chamber 2; when the plurality of silencer chambers includes at least one outlet silencer chamber 3, the air outlet of the piezoelectric pump body 1 is connected to the air inlet of the at least one outlet silencer chamber 3.

[0027] Furthermore, similar to existing pneumatic pumps, the pneumatic pump 100 may also include an intake filter 4; in the case where the plurality of silencers include at least one intake silencer 2, the intake end of the at least one intake silencer 2 is connected to the outlet end of the intake filter 4. Figure 3As shown in (a) and (d), the pneumatic pump body 1 and the air intake filter 4 are formed with at least one bend via the at least one air intake silencer 2.

[0028] The following is for reference Figure 4 The silencing principle of the silencing mechanism according to an embodiment of the present invention will be briefly explained. The silencing chamber of the silencing device according to an embodiment of the present invention primarily reduces and eliminates air pump noise based on the following principle:

[0029] (1) Interference principle: such as Figure 4 As shown in (a), when a sound wave passes through the anechoic cavity, the sound wave inside the anechoic cavity interacts with the incoming sound wave, causing the main noise spectrum components to interfere and be weakened.

[0030] (2) Principle of reflection: such as Figure 4 As shown in (b), the chamber and pipe structure inside the silencer are used to reflect sound waves, thereby reducing noise. The sound waves undergo multiple reflections as they pass through the silencer chamber, and the sound waves collide with the walls of the silencer chamber multiple times, dissipating most of the energy within the chamber and reducing the transmitted sound energy.

[0031] (3) Acoustic impedance sudden change principle: such as Figure 4 As shown in (c), by utilizing the abrupt change in the pipe cross-section, i.e. the change in acoustic impedance, a portion of the sound waves propagating along the pipe are reflected back towards the sound source, thereby reducing the sound transmitted to the external environment.

[0032] (4) Airflow filtration principle: such as Figure 4 As shown in (d), the silencing cavity with a cross-sectional area larger than that of the connecting trachea buffers the pulsating airflow in the trachea, greatly reducing the fluctuation amplitude of the airflow and thus reducing the noise generated by the pulsating airflow.

[0033] For convenience, Figure 4 The silencing process of the silencing chamber at the air inlet end of the main body 1 of the electric pneumatic pump is illustrated in the figure. However, those skilled in the art will understand that the same principle and process also apply to the silencing chamber at the air outlet end of the main body 1 of the electric pneumatic pump. The arrows representing the direction of sound and the wavy lines representing the airflow are omitted.

[0034] In the silencing mechanism according to the embodiments of this utility model, the connection between the additional silencing chamber and the original components of the pneumatic pump can be appropriately adopted by using a pipe connection or a pipeless connection, depending on the material of the silencing chamber. In the above description, for convenience, the description and illustrations mainly use a pipe connection, but a pipeless connection can also be used.

[0035] Figure 5This is an exemplary schematic diagram of the tubular connection method of the silencing mechanism according to an embodiment of the present invention, wherein (a) shows a schematic front sectional view of the pneumatic pump 100 with the silencing mechanism according to an embodiment of the present invention, taken along line AA; (b) shows a schematic top view of the pneumatic pump 100; and (c) shows a schematic side view of the pneumatic pump 100. According to, for example... Figure 5 As can be clearly seen in (a), the air inlet of the pneumatic pump body 1 is fastened to the air outlet of the air inlet silencer 2 via a connecting pipe 5a, the air outlet of the pneumatic pump body 1 is fastened to the air inlet of the air outlet silencer 3 via a connecting pipe 5b, and the air outlet of the air inlet filter 4 is fastened to the air inlet of the air outlet silencer 2 via a connecting pipe 5c.

[0036] Regarding the material of the connecting tube, materials such as silicone or rubber can be used. As a tubular connection method utilizing the connecting tube, it is generally applicable to various situations where the material of the silencing cavity is a rigid material such as hard plastic or a flexible material such as silicone, enabling the silencing mechanism according to the embodiments of this utility model to achieve excellent silencing effect while ensuring good airtightness.

[0037] In contrast, Figure 6 This is an exemplary schematic diagram of a tubeless connection method for a silencing mechanism according to an embodiment of the present invention, wherein (a) shows a schematic front sectional view of a pneumatic pump 100 with a silencing mechanism according to an embodiment of the present invention, taken along line BB; (b) shows a schematic top view of the pneumatic pump 100; and (c) shows a schematic side view of the pneumatic pump 100. Figure 5 The difference lies in the fact that it lacks connecting pipes such as the inlet connecting pipe 5a, the outlet connecting pipe 5b, and the filter connecting pipe 5c. According to, for example... Figure 6 As clearly seen in (a), the air inlet of the pneumatic pump body 1 is connected to the air outlet of the air inlet silencer 2 without the connection of an air pipe. The air inlet of the pneumatic pump body 1 can be fastened to the air outlet of the air inlet silencer 2 by means of an adhesive such as glue, or it can be directly inserted into the air outlet of the air inlet silencer 2 for fastening. The air outlet of the air inlet filter 4 can be fastened to the air inlet of the air inlet silencer 2 by means of an adhesive, or it can be directly inserted into the air inlet of the air inlet silencer 2 for fastening. The air outlet of the pneumatic pump body 1 can be fastened to the air inlet of the air outlet silencer 3 by means of an adhesive, or it can be directly inserted into the air inlet of the air outlet silencer 3 for fastening.

[0038] In the case that the material of the sound attenuation cavity is a hard material, a good seal between the air pump and the sound attenuation cavity can be achieved by punching holes on the sound attenuation cavity and then fixed by an adhesive such as glue; in the case that the material of the sound attenuation cavity is a flexible material, the original components of the piezoelectric air pump are directly inserted into the sound attenuation cavity, and a good seal between the air pump and the sound attenuation cavity can also be achieved. By adopting a suitable tubeless connection mode according to the material of the sound attenuation cavity, the sound attenuation mechanism according to the embodiments of the present application can also achieve excellent sound attenuation effect while ensuring good air tightness.

[0039] It should be noted that, although Figure 5 and Figure 6 respectively show the case that the air inlet sound attenuation cavity 2 and the air outlet sound attenuation cavity 3 are provided at the same time, and the same type (with tube / no tube) connection mode is adopted for both sound attenuation cavities, but those skilled in the art can understand that different types of connection modes can be adopted for the air inlet sound attenuation cavity 2 and the air outlet sound attenuation cavity 3 according to the situation, that is, the combination of with tube / no tube connection mode is adopted.

[0040] More specifically, regarding the sound attenuation mechanism according to the embodiments of the present application, in the case that the plurality of sound attenuation cavities includes the at least one air inlet sound attenuation cavity 2, when the at least one air inlet sound attenuation cavity 2 is composed of a hard material such as hard plastic, the air inlet of the piezoelectric air pump main body part 1 can be tightly connected with the air outlet end of the at least one air inlet sound attenuation cavity 2 via an adhesive such as glue or a connecting air tube as the air inlet connecting air tube 5a, and the air outlet end of the air inlet filter 4 can be tightly connected with the air inlet end of the at least one air inlet sound attenuation cavity 2 via an adhesive or a connecting air tube as the filter connecting air tube 5c; when the at least one air inlet sound attenuation cavity 2 is composed of a flexible material such as silica gel, the air inlet of the piezoelectric air pump main body part 1 can be tightly connected with the air outlet end of the at least one air inlet sound attenuation cavity 2 via a connecting air tube as the air inlet connecting air tube 5a, or directly inserted into the air outlet end of the at least one air inlet sound attenuation cavity 2 for tight connection, and the air outlet end of the air inlet filter 4 can be tightly connected with the air inlet end of the at least one air inlet sound attenuation cavity 2 via a connecting air tube as the filter connecting air tube 5c, or directly inserted into the air inlet end of the at least one air inlet sound attenuation cavity 2 for tight connection.

[0041] In addition, regarding the sound attenuation mechanism according to the embodiments of the present application, in the case where the plurality of sound attenuation cavities includes the at least one air outlet sound attenuation cavity 3, when the at least one air outlet sound attenuation cavity 3 is composed of a hard material such as hard plastic, the air outlet of the piezoelectric air pump body part 1 can be fastened and connected to the air inlet end of the at least one air outlet sound attenuation cavity 3 via an adhesive such as glue or a connecting air pipe as the air outlet connecting air pipe 5b; when the at least one air outlet sound attenuation cavity 3 is composed of a flexible material such as silica gel, the air outlet of the piezoelectric air pump body part 1 can be fastened and connected to the air inlet end of the at least one air outlet sound attenuation cavity 3 via a connecting air pipe as the air outlet connecting air pipe 5b, or directly inserted into the air inlet end of the at least one air outlet sound attenuation cavity 3 for fastening and connection.

[0042] For the convenience of illustration, in each of the drawings, the case where the air inlet sound attenuation cavity 2 and the air outlet sound attenuation cavity 3 are both 1 is illustrated and described, but those skilled in the art can understand that this is non-limiting, and the air inlet sound attenuation cavity 2 and the air outlet sound attenuation cavity 3 can be multiple. Although the illustration is omitted, in the case where the plurality of sound attenuation cavities has multiple air inlet sound attenuation cavities 2, the plurality of air inlet sound attenuation cavities 2 can include an air inlet sound attenuation cavity group in which multiple air inlet sound attenuation cavities are connected in series or connected at intervals via a connecting air pipe; in the case where the plurality of sound attenuation cavities has multiple air outlet sound attenuation cavities 3, the plurality of air outlet sound attenuation cavities 3 can include an air outlet sound attenuation cavity group in which multiple air outlet sound attenuation cavities are connected in series or connected at intervals via a connecting air pipe.

[0043] In order to achieve excellent sound attenuation effect, the volume of the sound attenuation cavity is preferably designed to be as large as possible. Specifically, in the case where the plurality of sound attenuation cavities has the at least one air inlet sound attenuation cavity 2, the overall volume of the at least one air inlet sound attenuation cavity 2 is preferably greater than the volume of the piezoelectric air pump body part 1; in the case where the plurality of sound attenuation cavities has the at least one air outlet sound attenuation cavity 3, the overall volume of the at least one air outlet sound attenuation cavity 3 is also preferably greater than the volume of the piezoelectric air pump body part 1.

[0044] The piezoelectric air pump with a sound attenuation mechanism according to the embodiments of the present application can be widely applied to various application scenarios utilizing piezoelectric air pumps. The present application can provide a device provided with a piezoelectric air pump, which can include the above-mentioned piezoelectric air pump. As specific examples of the device provided with a piezoelectric air pump, for example, a pillow as a smart bedding can be listed, in which the piezoelectric air pump is adopted as a mechanism for inflating and deflating, to adaptively adjust the height of the pillow according to various sleeping postures of the user including supine and prone, or to assist in performing various functions such as smart snoring stopping. In such a smart home scenario, the piezoelectric air pump with a sound attenuation mechanism of the present application achieves good mute effect, which can greatly improve the user's comfort and experience, and is helpful to improve the user's sleep quality and health maintenance.

[0045] It will be appreciated by persons skilled in the art that the technical spirit of the present application can be applied not only to any suitable bedding and other related fields and scenarios known at present, but also to any suitable bedding and other related fields and scenarios in the future.

[0046] The above merely illustrates the technical solutions of the present application but is not limited thereto, and other modifications or equivalent replacements to the technical solutions of the present application made by those skilled in the art should be encompassed in the scope of the claims of the present application, as long as they do not depart from the spirit and essential characteristics of the technical solutions of the present application. The effects described in the specification are merely illustrative and are not limited thereto, and there can be other effects.

Claims

1. A piezoelectric gas pump (100) characterized by: The piezoelectric air pump body (1) and the sound attenuation mechanism, wherein The sound attenuation mechanism has: A plurality of sound attenuation cavities, including at least one air inlet sound attenuation cavity (2) and / or at least one air outlet sound attenuation cavity (3), In the case of the plurality of sound attenuation cavities including the at least one air inlet sound attenuation cavity (2), the air inlet of the piezoelectric air pump body (1) is connected to the air outlet end of the at least one air inlet sound attenuation cavity (2), In the case of the plurality of sound attenuation cavities including the at least one air outlet sound attenuation cavity (3), the air outlet of the piezoelectric air pump body (1) is connected to the air inlet end of the at least one air outlet sound attenuation cavity (3).

2. The piezoelectric air pump according to claim 1, wherein: The piezoelectric air pump (100) further has an air inlet filter (4), In the case of the plurality of sound attenuation cavities including the at least one air inlet sound attenuation cavity (2), the air inlet end of the at least one air inlet sound attenuation cavity (2) is connected to the air outlet end of the air inlet filter (4).

3. The piezoelectric air pump according to claim 2, wherein: The piezoelectric air pump body (1) and the air inlet filter (4) are formed into a shape with at least one bend via the at least one air inlet sound attenuation cavity (2).

4. The piezoelectric air pump according to claim 1, wherein: In the case of the plurality of sound attenuation cavities including the at least one air inlet sound attenuation cavity (2), When the at least one air inlet sound attenuation cavity (2) is made of a hard material, the air inlet of the piezoelectric air pump body (1) is fastened to the air outlet end of the at least one air inlet sound attenuation cavity (2) via an adhesive or an air inlet connecting air pipe (5a), When the at least one air inlet sound attenuation cavity (2) is made of a flexible material, the air inlet of the piezoelectric air pump body (1) is fastened to the air outlet end of the at least one air inlet sound attenuation cavity (2) via an air inlet connecting air pipe (5a), or is directly inserted into the air outlet end of the at least one air inlet sound attenuation cavity (2).

5. The piezoelectric air pump according to claim 2, wherein: In the case of the plurality of sound attenuation cavities including the at least one air inlet sound attenuation cavity (2), When the at least one air inlet sound attenuation cavity (2) is made of a hard material, the air outlet end of the air inlet filter (4) is fastened to the air inlet end of the at least one air inlet sound attenuation cavity (2) via an adhesive or a filter connecting air pipe (5c), When the at least one air inlet sound attenuation cavity (2) is made of a flexible material, the air outlet end of the air inlet filter (4) is fastened to the air inlet end of the at least one air inlet sound attenuation cavity (2) via a filter connecting air pipe (5c), or is directly inserted into the air inlet end of the at least one air inlet sound attenuation cavity (2).

6. The piezoelectric air pump according to claim 1, wherein: In the case of the plurality of sound attenuation cavities including the at least one air outlet sound attenuation cavity (3), When the at least one air outlet sound attenuation cavity (3) is made of a hard material, the air outlet of the piezoelectric air pump body (1) is fastened to the air inlet end of the at least one air outlet sound attenuation cavity (3) via an adhesive or an air outlet connecting air pipe (5b), When the at least one air outlet muffling cavity (3) is made of a flexible material, the air outlet of the piezoelectric air pump body (1) is fastened to the air inlet end of the at least one air outlet muffling cavity (3) via an air outlet connecting air pipe (5b), or is directly inserted into the air inlet end of the at least one air outlet muffling cavity (3) and fastened.

7. The piezoelectric air pump according to claim 1, characterized in that: When the plurality of muffling cavities includes the at least one air inlet muffling cavity (2), the at least one air inlet muffling cavity (2) includes a plurality of air inlet muffling cavities connected in series or connected in groups at intervals via connecting air pipes (5). When the plurality of muffling cavities includes the at least one air outlet muffling cavity (3), the at least one air outlet muffling cavity (3) includes a plurality of air outlet muffling cavities connected in series or connected in groups at intervals via connecting air pipes (5).

8. The piezoelectric air pump according to claim 1, characterized in that: When the plurality of muffling cavities includes the at least one air inlet muffling cavity (2), the overall volume of the at least one air inlet muffling cavity (2) is greater than the volume of the piezoelectric air pump body (1), and / or When the plurality of muffling cavities includes the at least one air outlet muffling cavity (3), the overall volume of the at least one air outlet muffling cavity (3) is greater than the volume of the piezoelectric air pump body (1).

9. An apparatus provided with a piezoelectric air pump, characterized in that: It includes the piezoelectric air pump according to any one of claims 1-8.

10. The apparatus provided with a piezoelectric air pump according to claim 9, characterized in that: It includes a pillow as a smart bedding.

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