Piezoelectric air pump, air circulation mechanism, and circulation device

Abstract

This application discloses a piezoelectric pump, a gas circulation mechanism, and a circulation device. The circulation device includes a piezoelectric pump or a gas circulation mechanism. The piezoelectric pump includes at least one set of sub-pumps. Each sub-pump includes a housing and a vibration assembly. The housing includes a receiving cavity, at least one air inlet channel, and at least one combined air outlet channel communicating with the receiving cavity. The receiving cavity is connected to an external space through the air inlet channel and the combined air outlet channel. A dispersion structure is provided on the cavity wall of the receiving cavity. The vibration assembly is disposed in the receiving cavity, and the dispersion structure is used to disperse the reflected airflow from the cavity wall of the receiving cavity when the vibration assembly vibrates. The piezoelectric pump in this application can reduce operating noise and its own size, thereby meeting the user's dual requirements for quiet operation and lightweight design when using the circulation device.

Description

Technical Field

[0001] This application relates to the field of piezoelectric pump technology, and in particular to a piezoelectric pump, a gas circulation mechanism, and a circulation device. Background Technology

[0002] Under rated operating conditions, existing piezoelectric pumps generate perceptible broadband noise in the near field through structure-cavity coupling from multiple internal excitation sources. The A-weighted sound pressure level is significantly higher than the ambient noise level, with the majority of energy concentrated in the frequency band sensitive to human hearing. This noise increases non-linearly with increasing load, resulting in a significant auditory masking effect within typical application distances. Even in quiet environments, the noise prominence of piezoelectric pumps exceeds the 8 dB prominence threshold specified in ISO 7779, negatively impacting the user experience. Summary of the Invention

[0003] In view of this, and in response to the above-mentioned technical problems, this application provides a piezoelectric pump, a gas circulation mechanism, and a circulation device.

[0004] A first aspect of this application provides a piezoelectric pump, which includes at least one set of sub-pumps. Each sub-pump includes a housing and a vibration assembly. The housing includes a receiving cavity, at least one air inlet channel and at least one combined air outlet channel communicating with the receiving cavity. The receiving cavity is connected to an external space through the air inlet channel and the combined air outlet channel. A dispersion structure is provided on the cavity wall of the receiving cavity. The vibration assembly is disposed within the receiving cavity, and the dispersion structure is used to disperse the reflected airflow from the cavity wall of the receiving cavity when the vibration assembly vibrates.

[0005] The piezoelectric pump described in this application reduces operating noise and power consumption, and enables it to output stable DC, extending the lifespan of the vibrating components. Furthermore, it eliminates the need for additional noise reduction methods such as thickening the casing or adding sound-absorbing layers, thus meeting the user's dual requirements for quiet operation and lightweight design when using the circulation device.

[0006] The second aspect of this application provides a gas circulation mechanism, which includes the piezoelectric pump, first gas supply pipe, second gas supply pipe, gas supply target, and pressure relief valve as described in the first aspect of this application. The first gas supply pipe is connected to the gas inlet channel, the second gas supply pipe is connected to the combined gas outlet channel, the gas supply target includes an gas inlet and a gas outlet, the first gas supply pipe is connected to the gas inlet, the second gas supply pipe is connected to the gas outlet, and the pressure relief valve is connected to the second gas supply pipe to control the gas flow of the second gas supply pipe.

[0007] A third aspect of this application provides a circulation device, which includes the piezoelectric pump of the first aspect of this application or the gas circulation mechanism of the second aspect of this application.

[0008] Since the beneficial effects of the second and third aspects of the embodiments of this application are derived from the first aspect of the embodiments of this application, the main beneficial effects of the second aspect of the embodiments of this application can be specifically referred to the beneficial effects of the first aspect of the embodiments of this application, and will not be repeated here.

[0009] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, embodiments of this application are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the composition of a circulation device in this application; Figure 2 This is a schematic diagram of the structure of the first embodiment of the medium-voltage electric pump in this application; Figure 3 for Figure 2 Exploded view of a medium-voltage electric pump; Figure 4 This is a schematic diagram of the vibration assembly. Figure 5 for Figure 4 Reconstruction curve diagram of medium-voltage ceramic sheet; Figure 6 for Figure 2 Bottom view of a medium-pressure electric pump; Figure 7 for Figure 6 Cross-sectional view at point AA; Figure 8 for Figure 7 Enlarged view of point C in the middle; Figure 9 for Figure 6 Cross-sectional view at point BB; Figure 10 This is a schematic diagram of the structure of the second embodiment of the medium-pressure electric pump in this application; Figure 11 for Figure 10 Exploded view of a medium-voltage electric pump; Figure 12 for Figure 11Schematic diagram of the structure of the second shell section; Figure 13 for Figure 12 Bottom view of the second shell section; Figure 14 for Figure 13 Cross-sectional view at the EE section; Figure 15 for Figure 13 Cross-sectional view at point DD; Figure 16 for Figure 13 Cross-sectional view at the middle FF section; Figure 17 for Figure 10 Bottom view of a medium-pressure electric pump; Figure 18 for Figure 17 Cross-sectional view at HH; Figure 19 for Figure 18 Enlarged view of point J in the middle; Figure 20 for Figure 17 Cross-sectional view at GG in the middle; Figure 21 for Figure 17 Cross-sectional view at point II; Figure 22 for Figure 2 and / or Figure 10 A schematic diagram of the first embodiment of the first check valve of a medium-pressure electric pump; Figure 23 for Figure 22 Exploded view of the first check valve in the middle; Figure 24 for Figure 22 Bottom view of the first check valve in the middle; Figure 25 for Figure 24 Cross-sectional view at point KK; Figure 26 for Figure 25 Enlarged view of point L in the middle; Figure 27 for Figure 2 and / or Figure 10 A schematic diagram of the second embodiment of the first check valve of a medium-pressure electric pump; Figure 28 for Figure 27 Exploded view of the first check valve in the middle; Figure 29 for Figure 27 Bottom view of the first check valve in the middle; Figure 30 for Figure 29 Cross-sectional view at point MM; Figure 31 for Figure 30 A magnified view of point N in the middle.

[0012] It should be noted that the accompanying drawings are not necessarily drawn to scale, but are shown only in a schematic manner without affecting the reader's understanding.

[0013] Reference numerals: 1000-Circulation device, 1-Gas circulation mechanism, 10-First gas delivery pipe, 11-Second gas delivery pipe, 12-Gas delivery target, 13-Pressure relief valve, 2-Piezoelectric pump, 27-Sub-pump, 20-Housing shell, 200-Inner cavity, 2000-First inner chamber, 2001-Second inner chamber, 2002-First cavity wall, 2003-Second cavity wall, 201-Inlet channel, 202-Outlet channel, 203-Dispersion structure, 204-Connecting air passage, 205-First shell, 206-Second shell, 21-Vibration assembly, 211-Piezoelectric ceramic sheet, 212-First electrode layer, 213-Second electrode layer, 214-F PC, 215-Solder point, 216-Reset plate, 22-First check valve, 220-First valve base plate, 2200-Board body, 2201-Blocking platform, 2202-Platform base, 2203-Platform protrusion, 2204-Third through hole, 2205-Reinforcing rib, 221-First valve diaphragm, 2210-First fixing part, 2211-First moving part, 2212-Second through hole, 2213-Diaphragm body, 2214-Diaphragm connecting rib, 2215-Blocking part, 222-First valve cover plate, 2220-First through hole, 23-Second check valve, 24-First sub-pump, 25-Second sub-pump, 26-Combined air outlet channel, 28-Communicator. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application.

[0015] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application pertains. The terms “an,” “a,” or “the,” as used herein, do not indicate a limitation of quantity, but are merely used to indicate the presence of at least one. Terms such as “comprising” or “including” mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as “connected” or “linked” are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0016] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0017] To facilitate understanding of the prior art solutions mentioned in this application, the relevant terms involved in the prior art will now be explained and described.

[0018] Rated operating conditions: A combination of "nominal operating conditions" (voltage, back pressure, medium, temperature, humidity, etc.) specified by the equipment manufacturer / standard, under which the equipment must output nominal performance stably for a long period of time.

[0019] Internal multi-source excitation: a collective term for all vibration-sound sources that occur simultaneously in a pneumatic pump and have different frequencies and amplitudes.

[0020] Broadband noise: A standard term in acoustics, referring to random noise whose energy is continuously distributed over a wide frequency range (typically covering hundreds of Hz to tens of kHz) and has no significant discrete tonal peaks. Unlike "pure tone" or "narrowband whistle," broadband noise has a spectrum that is a continuous plateau or slope, sounding like a steady-state background noise such as "hissing" or "sizzling."

[0021] A-weighted sound pressure level (SPL): often written as dB(A) or LA, is the total SPL calculated by first adding the "human ear's sensitivity to different frequencies of sound". dB(A) is not the "most physically accurate sound pressure level", but rather an approximate quantification of "how loud it sounds".

[0022] Typical application distance: This is not a strict physical quantity, but rather the "most frequently occurring and most critically assessed" human-machine interval given in product standards, testing specifications, or user scenarios. It abstracts the "noise that is heard when people are too close" into a fixed value, facilitating horizontal comparisons between different devices.

[0023] Auditory masking effect: refers to the phenomenon that the presence of one sound (masking sound) raises the "minimum audible threshold" of another sound (target sound), making it more difficult or impossible for people to hear the target sound.

[0024] Prominence threshold: The threshold value specified in ISO 7779 for determining whether a discrete tone is "clearly audible". ISO 7779 defines the "prominence threshold" as 8 dB: if a discrete tone is more than 8 dB higher than the background noise in its critical frequency band, it is considered prominent, which can be clearly perceived by more than 90% of listeners and may cause additional annoyance.

[0025] Subjective annoyance index: refers to the normalized value of the degree of annoyance of sound to a user group. It can be obtained through jury trials or calculated by psychoacoustic parameter models such as loudness and sharpness. It is used to objectively reflect the subjective feeling of whether the device is "noisy" or not.

[0026] Under rated operating conditions, existing piezoelectric pumps generate perceptible broadband noise in the near field after multi-source excitation is coupled through the structure-acoustic cavity. The A-weighted sound pressure level is significantly higher than the ambient noise level (typically 10–20 dB(A) higher), with the main energy concentrated in the frequency range sensitive to human hearing (1–8 kHz). This noise increases non-linearly with increasing load, resulting in a significant auditory masking effect within typical application distances. Even in quiet environments (35 dB(A)), the noise prominence rate of piezoelectric pumps exceeds the 8 dB prominence threshold specified in ISO 7779, leading to a high subjective annoyance index among users, reaching over 75%, resulting in a poor experience of quiet operation for piezoelectric pump users.

[0027] To address the aforementioned problems, this application provides a method such as Figure 1 The circulation device 1000 shown includes a piezoelectric pump 2. By improving the piezoelectric pump 2 used in the circulation device 1000, the pump noise during user operation is reduced. To facilitate understanding of the technical solution, the following will further illustrate this in conjunction with embodiments of this application. Figures 2-30 The technical solutions in the embodiments of this application are clearly and completely described. The directions indicated in some figures schematically correspond to the main flow direction of the airflow in the pneumatic pump 2. It should be noted that, in order to clearly and obviously show the various features to the reader, when multiple substantially identical structures appear in the figures, only one structure is schematically labeled to avoid interfering with the user's clear identification.

[0028] It should be noted that the aforementioned circulation device 1000 may be, but is not limited to, a negative pressure type device such as a breast pump for mothers and infants, a milking machine for livestock, a negative pressure adsorption wound treatment device, or a cupping massage device. The gas circulation system may also be a pressurized (positive pressure) type device such as an eye airbag massager, a head airbag massager, a portable blood pressure monitor, or an airbag blood pressure monitoring watch.

[0029] For reference Figures 2 to 21 In some embodiments, the piezoelectric pump 2 includes at least one set of sub-pumps 27. Each sub-pump 27 includes a housing 20 and a vibration assembly 21. The housing 20 includes a receiving cavity 200, at least one air inlet channel 201 communicating with the receiving cavity 200, and at least one combined air outlet channel 26. The receiving cavity 200 is connected to the external space of the housing 20 through the air inlet channel 201 and the combined air outlet channel 26. A dispersion structure 203 is provided on the cavity wall of the receiving cavity 200. The vibration assembly 21 is disposed in the receiving cavity 200, and the dispersion structure 203 is used to disperse the reflected airflow from the cavity wall of the receiving cavity 200 when the vibration assembly 21 vibrates.

[0030] It is important to understand that when the pneumatic pump 2 is operating, the vibration component 21 periodically changes the volume of the inner cavity 200 on both sides of it through its reciprocating deformation, thereby driving the gas inside the cavity to move along... Figure 7 , Figure 18 The airflow flows in the indicated direction. Simultaneously, the compression and expansion of the local cavity volume within the accommodating cavity 200 disturbs the gas flow. If the cavity wall is smooth and flat, the airflow reflects along a mirror path, forming regular standing waves that superimpose on each other. This not only significantly increases the overall noise level but also induces additional mechanical resonance when the pressure fluctuations of the standing waves act in the opposite direction on the vibrating component 21, leading to increased power consumption and intensified flow pulsation of the piezoelectric pump 2. In existing technologies, to suppress the noise during operation of the circulation device 1000, the product designers can only thicken the shell 20 or add a sound-absorbing layer. However, this increases the size of the circulation device 1000 and hinders heat dissipation, making it difficult to meet the user's dual requirements for quiet operation and lightweight design.

[0031] In the above embodiment, the sidewall of the accommodating cavity 200 of the sub-air pump 27 is provided with a dispersion structure 203. This dispersion structure 203 can break the originally regular and in-phase wall reflections into multi-directional and randomly phased diffuse reflections, thereby disrupting the standing wave formation conditions and reducing the energy superposition within the accommodating cavity 200. In this way, not only can the noise of the sub-air pump 27 during operation be reduced, but also the additional power consumption of the piezoelectric pump 2 can be reduced, and the piezoelectric pump 2 can output stable DC, and to a certain extent, extend the service life of the vibration component 21. In addition, the piezoelectric pump 2 does not need to reduce the noise of the piezoelectric pump 2 during operation by thickening the shell 20 or adding a sound-absorbing layer, thus meeting the user's dual requirements of quiet operation and lightweight design when using the circulation device 1000.

[0032] It should be noted that the pneumatic electric pump 2 in this embodiment can be as follows: Figure 2 The diagram shows a sub-pump 27, which can also be used as follows: Figure 10 The diagram shows two sub-pumps 27. In other feasible embodiments, by reasonably arranging the positions of the sub-pumps 27, the pneumatic pump 2 can also include three, four (such as a 2*2 matrix arrangement) or even more sub-pumps 27. However, it should be noted that the air outlet channels 202 of multiple sub-pumps 27 are connected in parallel to form the above-mentioned combined air outlet channel 26.

[0033] In some embodiments, the dispersion structure 203 includes at least one of a protruding structure, a groove structure, and a concave-convex structure. The protruding structure, the groove structure, and the concave-convex structure can all be realized by secondary processing to accommodate the sidewall of the inner cavity 200. Moreover, the processing technology of this common structure is mature and will not increase the processing cost of the shell 20.

[0034] like Figure 3 and Figure 11 As shown, in some embodiments, the housing 20 includes a first housing portion 205 and a second housing portion 206, which cover and constrain to form an accommodating cavity 200.

[0035] In some embodiments, the shape of the concave-convex structure includes, for example, Figure 3 As shown, the wavy, concave-convex structure surrounds the periphery of the vibration component 21. Because the surface of the wavy, concave-convex structure is arc-shaped, its diffuse reflection effect on airflow is stronger. Compared with locally planar concave-convex structures (such as prisms, frustums, etc.), the wavy, concave-convex structure in this embodiment can improve the diffuse reflection effect on airflow, thereby disrupting the standing wave formation conditions and reducing the energy superposition within the cavity 200. This reduces the noise of the sub-air pump 27 during operation, reduces the additional power consumption of the piezoelectric pump 2, enables the piezoelectric pump 2 to output stable DC, and extends the service life of the vibration component 21 to a certain extent.

[0036] Please refer to further information. Figure 4 and Figure 5 In some embodiments, the vibration component 21 includes a piezoelectric ceramic sheet 211, a first electrode layer 212, and a second electrode layer 213. The first electrode layer 212 and the second electrode layer 213 are located on the end face and side face of the piezoelectric ceramic sheet 211, respectively, and the first electrode layer 212 and the second electrode layer 213 are spaced apart. It should be noted that an insulating gap needs to be provided between the first electrode layer 212 and the second electrode layer 213 to avoid the first electrode layer 212 from being electrically connected to the second electrode layer 213 and causing a short circuit.

[0037] It is important to understand that the piezoelectric ceramic sheet 211 introduces an alternating electric field by means of two electrode layers coated on its surface. The alternating electric field is evenly distributed throughout the piezoelectric ceramic sheet 211 through the two electrode layers, which excites the piezoelectric ceramic sheet 211 to undergo micron-level stretching and deformation along the polarization direction, so as to efficiently convert electrical energy into mechanical vibration of the vibration component 21, thereby driving the piezoelectric pump 2 to achieve rapid and electromagnetic interference-free miniaturized operation.

[0038] In this embodiment, since the first electrode layer 212 and the second electrode layer 213 are located on different surfaces of the piezoelectric ceramic sheet 211, the coating area of ​​the first electrode layer 212 and the second electrode layer 213 on the surface of the piezoelectric ceramic sheet 211 can be increased as much as possible to increase the effective coverage area of ​​the alternating electric field, increase the active area of ​​the piezoelectric ceramic sheet 211 participating in the reverse voltage effect, and increase the overall deformation and output force of the piezoelectric ceramic sheet 211. This improves the working effect of the vibration component 21, increases the suction-discharge cycle frequency of the piezoelectric pump 2, and enables the piezoelectric pump 2 to achieve rapid, electromagnetic interference-free miniaturized operation.

[0039] As the area of ​​the electrode layer and the active region of the piezoelectric ceramic sheet 211 increase, the overall deformation of the piezoelectric ceramic sheet 211 also increases, and the amplitude of the driving vibration component 21 increases synchronously. After the amplitude of the vibration component 21 increases, the "pull-squeeze" amplitude of the vibration component 21 on the local volume of the receiving cavity 200 with each reciprocating motion is larger, and the volume change generated per unit stroke is increased. According to the ideal gas law, the instantaneous gas pressure increment in the receiving cavity 200 increases significantly. The higher pressure difference pushes the gas through the valve port at a higher speed, enabling the piezoelectric pump 2 to output a larger flow rate at the same frequency.

[0040] At the same time, after the amplitude of the electric pneumatic pump 2 increases, the exhaust volume of the electric pneumatic pump 2 in a single cycle is more sufficient. The pressure fluctuation in the cavity is offset by the rapid "emptying-filling" of the gas. The pressure peak and valley difference in the cavity decreases, and the flow pulsation amplitude of the electric pneumatic pump 2 decreases accordingly, making the output airflow of the electric pneumatic pump 2 more stable.

[0041] In summary, in the embodiments described in this section, the piezoelectric pump 2 can output a larger flow rate at the same frequency, and the pulsation of the piezoelectric pump 2 decays faster. Thus, the piezoelectric pump 2 achieves a performance leap of "small increase in amplitude and significant increase in flow rate".

[0042] Please refer to Figure 4 In some embodiments, the piezoelectric ceramic sheet 211 is a circular sheet with a radius of R. The distance between the edge of the first electrode layer 212 and the center of the piezoelectric ceramic sheet 211 is 0.63*R*(1±0.2). In other words, there is an insulation distance d1 between the first electrode layer 212 and the second electrode layer 213, where 0.50R≤d1≤0.76R. The insulation distance is used to ensure electrical insulation between the first electrode layer 212 and the second electrode layer 213.

[0043] It should be understood that the size of the first electrode layer 212 directly determines the size of the active region of the piezoelectric ceramic sheet 211. Specifically, the size of the first electrode layer 212 is the area projected onto the surface of the piezoelectric ceramic sheet 211. Only the piezoelectric ceramic sheet 211 located within this projection area will be polarized by the applied electric field and undergo inverse piezoelectric deformation, while the area not covered by the electrode hardly participates in the stretching deformation. Therefore, by adjusting the area of ​​the first electrode layer 212, the size of the active region of the piezoelectric ceramic sheet 211 can be precisely controlled, thereby controlling the deformation and output force of the piezoelectric ceramic sheet 211. The periodic deformation generated by the piezoelectric ceramic sheet 211 located in the aforementioned active region drives the vibration component 21 to reciprocate, causing high-frequency changes in the volume of the accommodating cavity 200, thus enabling the piezoelectric pump 2 to complete the entire process of "intake-compression-exhaust," achieving flow output and pressure increase for the piezoelectric pump 2.

[0044] Therefore, in the above embodiments, under the premise of ensuring electrical insulation between the first electrode layer 212 and the second electrode layer 213, the active area of ​​the piezoelectric ceramic sheet 211 can be expanded as much as possible within a reasonable range by adjusting the area occupied by the first electrode layer 212 on the surface of the piezoelectric ceramic sheet 211, so that the piezoelectric pump 2 can output sufficient flow at the same frequency, making the output airflow of the piezoelectric pump 2 more stable and meeting the user's needs for the circulation equipment.

[0045] In addition, since the piezoelectric ceramic sheet 211 is very small, the coating of the electrode layer is somewhat difficult. When 0.50R≤d1≤0.76R, the processing personnel can perform the processing operation efficiently and accurately to coat the first electrode layer 212 onto the surface of the piezoelectric ceramic sheet 211. Thus, setting 0.50R≤d1≤0.76R can reduce the difficulty of the processing personnel to coat the first electrode layer 212 onto the surface of the piezoelectric ceramic sheet 211 to a certain extent, thereby improving the processing qualification rate of the piezoelectric ceramic sheet 211 and reducing the processing cost of the piezoelectric ceramic sheet 211.

[0046] You can continue to refer to this. Figure 4 In some embodiments, the vibration assembly 21 further includes an FPC 214, which is used to transmit a driving voltage to the surface electrode layer of the piezoelectric ceramic sheet 211. The FPC 214 includes a plurality of welded portions arranged in a ring, which surround the periphery of the piezoelectric ceramic sheet 211, and the plurality of welded portions are welded to and electrically connected to the second electrode layer 213 by spot welding.

[0047] In one feasible implementation, FPC214 is first soldered to the second electrode layer 213 via solder points 215 to achieve an electrical connection between FPC214 and the second electrode layer 213. Simultaneously, FPC214 is then electrically connected to the first electrode layer 212 via copper foil traces to the pad area of ​​FPC214 to complete the electrical connection between the first electrode layer 212 and FPC214. In this way, the first electrode layer 212, the second electrode layer 213, and FPC214 form a closed power supply circuit outside the piezoelectric ceramic sheet 211. The driving voltage is simultaneously applied to the first electrode layer 212 and the second electrode layer 213 via FPC214, while the piezoelectric ceramic sheet 211 always acts as an insulating medium to withstand only the alternating electric field. Under the action of the alternating electric field, the piezoelectric ceramic sheet 211 undergoes inverse piezoelectric deformation and drives the vibration component 21 to reciprocate within the receiving cavity 200, enabling the piezoelectric pump 2 to perform the pumping function.

[0048] In this embodiment, spot welding can achieve electrical conductivity between FPC214 and the second electrode layer 213, and also stably connect the piezoelectric ceramic sheet 211 to FPC214. This effectively replaces the previous step of connecting the second electrode layer 213 to the pad area of ​​FPC214 via copper foil traces. This simplifies the assembly process between the piezoelectric ceramic sheet 211 and FPC214, and also improves the connection strength between FPC214 and piezoelectric ceramic sheet 211, thus effectively improving the processing efficiency and pass rate of the vibration component 21.

[0049] like Figure 8 and Figure 19As shown, in some embodiments, the vibration assembly 21 further includes a reset plate 216, which is connected to the piezoelectric ceramic sheet 211 on opposite sides of the FPC 214. The reset plate 216 supports the piezoelectric ceramic sheet 211 and can constrain the piezoelectric ceramic sheet 211 to a certain extent to prevent the piezoelectric ceramic sheet 211 from breaking due to excessive deformation. When the piezoelectric ceramic sheet 211 drives the FPC 214 to move away from the reset plate 216, the reset plate 216 can provide the tension required for the FPC 214 to return to its original position, so that the vibration assembly 21 can return to its original position after the piezoelectric pump 2 has finished operating, thus ensuring the subsequent operating effect of the piezoelectric pump 2.

[0050] Since the reset plate 216 has a certain weight, in some other embodiments, the weight of the reset plate 216 is adjusted to change the mass of the vibration component 21, thereby adjusting the vibration frequency of the vibration component 21 and thus changing the drive frequency of the piezoelectric pump 2.

[0051] For reference Figures 7 to 9 ,as well as Figures 18 to 21 In some embodiments, the vibrating component 21 is peripherally connected to the circumferential wall of the receiving cavity 200. The vibrating component 21 divides the receiving cavity 200 into a first inner chamber 2000 and a second inner chamber 2001. The first inner chamber 2000 is configured to connect to the air intake channel 201, and the second inner chamber 2001 is configured to connect to the combined air outlet channel 26. The vibrating component 21 performs periodic reciprocating vibration in the receiving cavity 200 to cause the volume of the first inner chamber 2000 and the second inner chamber 2001 to change at high frequency, thereby enabling the electric pneumatic pump 2 to complete the entire process of "inhalation-compression-exhaust" and realize the flow output and pressure increase of the electric pneumatic pump 2.

[0052] The housing 20 also includes a connecting air passage 204, the two ends of which are connected to the first inner chamber 2000 and the second inner chamber 2001, respectively. During the reciprocating vibration of the vibration component 21, the vibration component 21 alternately and periodically compresses the first inner chamber 2000 and the second inner chamber 2001, so that both the first inner chamber 2000 and the second inner chamber 2001 produce an effect of increased air pressure.

[0053] like Figure 10 and Figure 11 As shown, the two connecting air passages 204 can be connected by the communicating vessel 28, or by reasonably setting the structure of the housing 20 (such as openings inside the housing 20) so that the two connecting air passages 204 can be connected.

[0054] The accommodating cavity 200 has a first cavity wall 2002 and a second cavity wall 2003 arranged opposite to each other along the thickness direction. The first cavity wall 2002 is located in the first inner cavity 2000, and the second cavity wall 2003 is located in the second inner cavity 2001. The first cavity wall 2002 and the second cavity wall 2003 are disposed on opposite sides of the vibration assembly 21, and the circumferential cavity wall of the accommodating cavity 200 is connected between the first cavity wall 2002 and the second cavity wall 2003.

[0055] Specifically, the vibration component 21 first moves towards the first cavity wall 2002 to compress the first inner chamber 2000. At this time, the volume of the first inner chamber 2000 decreases, and the air pressure inside the first inner chamber 2000 increases. Some of the gas in the first inner chamber 2000 enters the second inner chamber 2001 through the connecting air passage 204, increasing the gas storage in the second inner chamber 2001 and achieving a pressure boost in the second inner chamber 2001. Then, the vibration component 21 moves towards the second cavity wall 2003 to compress the second inner chamber 2001. At this time, the second inner chamber 200... 1. The volume decreases, and the gas storage space in the second inner chamber 2001 is compressed, so that the gas pressure in the second inner chamber 2001 is increased twice. Then, the gas in the second inner chamber 2001 flows out from the combined gas outlet channel 26 to be delivered to the gas delivery target 12. In this way, the second inner chamber 2001 is pressurized twice in one vibration cycle of the vibration component 21, which not only increases the gas output of the piezoelectric pump 2, but also increases the gas output efficiency of the piezoelectric pump 2, so that the piezoelectric pump 2 can quickly input a large amount of gas for the gas delivery target 12 to use.

[0056] It should be noted that when the vibration component 21 moves toward the second cavity wall 2003, the volume of the first inner chamber 2000 increases, and the air pressure inside the first inner chamber 2000 decreases accordingly. Due to the isolation effect of the vibration component 21, the gas located outside the housing 20 will enter the first inner chamber 2000 through the air inlet channel 201 to replenish the gas in the first inner chamber 2000 in a timely manner. On the one hand, this allows the air pressure in the first inner chamber 2000 to be restored to atmospheric pressure so as not to hinder the subsequent vibration effect of the vibration component 21. On the other hand, since the first inner chamber 2000 can be continuously replenished with gas, the piezoelectric pump 2 can also continuously input gas to the gas delivery target 12, thereby enabling the piezoelectric pump 2 to perform continuous gas delivery operations.

[0057] Please continue to refer to this. Figures 7 to 9 ,as well as Figures 18 to 21 In some embodiments, the distance between the first cavity wall 2002 and / or the second cavity wall 2003 and the vibration component 21 gradually increases from the center to the edge of the first cavity wall 2002 and / or the second cavity wall 2003.

[0058] When the vibration component 21 vibrates, such as Figure 4 When the vibration component 21 shown vibrates, its maximum amplitude is located in the middle of the vibration component 21. The edge area of ​​the vibration component 21, not covered by the first electrode layer 212, moves in a direction opposite to the middle of the vibration component 21, causing the entire vibration component 21 to vibrate and bend towards the same side. In the above embodiment, since the dimensions of the first inner cavity wall and the second inner cavity wall gradually increase from the center to the edge, the position of the vibration component 21 relative to the first and second inner cavity walls can be correspondingly set so that when the vibration component 21 vibrates and deforms, the central area of ​​the vibration component 21 can be close to the central area of ​​the first cavity wall 2002 or the second cavity wall 2003, and the edge area of ​​the vibration component 21 can be correspondingly close to the edge area of ​​the second cavity wall 2003 or the first cavity wall 2002. In short, the shapes of the first and second inner cavity walls can adapt to the bending deformation of the vibration component 21, so that there is no structural interference between the first and second inner cavity walls and the vibration component 21, maintaining the performance and service life of the vibration component 21.

[0059] Since the vibration amplitude of the middle part of the vibration component 21 is higher than that of the edge area when the vibration component 21 vibrates, when the vibration component 21 vibrates and deforms so that its middle part is close to the first inner cavity wall, a slit can be formed between the middle part of the vibration component 21 and the first or second inner cavity wall at the opening of the air inlet channel 201 to reduce the phenomenon of gas escaping from the air inlet channel 201. As a result, the gas entering the first inner cavity 2000 can be output from the combined air outlet channel 26, increasing the output air flow of the pneumatic electric pump 2.

[0060] Furthermore, since the dimensions of the first inner cavity wall and the second inner cavity wall gradually increase from the center to the edge, the first inner cavity 2000 and the second inner cavity 2001 have larger gas storage space on both sides. This allows for the temporary storage of gas entering the first inner cavity 2000 and the second inner cavity 2001 during the operation of the pneumatic pump 2, which is then used for output by the pneumatic pump 2. At the same time, the first inner cavity wall and the second inner cavity wall can also form inclined guide surfaces to guide the gas entering the first inner cavity 2000 and the second inner cavity 2001 to the sides of the first inner cavity wall and the second inner cavity wall. This prevents the gas from being bounced back along the original path due to the vibration deformation of the vibration component 21 after entering through the air inlet channel 201, thus affecting the performance of the pneumatic pump 2.

[0061] Please refer to this as well. Figure 5 , Figures 7 to 9 ,as well as Figures 18 to 21 In some embodiments, the air inlet of the air intake channel 201 corresponds to the position of the vibration peak of the vibration component 21; and / or, the air inlet of the connecting airway 204 corresponds to the position of the vibration node of the vibration component 21.

[0062] Figure 5 The image shows the reconstructed curve of the piezoelectric ceramic sheet 211. It should be noted that the reconstructed curve "digitizes" the true shape of the structure into a curve and places it in a coordinate system, making it visible, measurable, and usable. In other words, the reconstructed curve can represent the true shape of the piezoelectric ceramic sheet 211 when the vibration assembly 21 is operating. Figure 5 In the diagram, P1 and P2 represent the maximum amplitude position of the piezoelectric ceramic sheet 211, Y1 represents the first reconstruction curve when the piezoelectric ceramic sheet 211 vibrates towards the second inner cavity wall, Y2 represents the second reconstruction curve when the piezoelectric ceramic sheet 211 vibrates towards the first inner cavity wall, the X-axis represents the initial plane of the piezoelectric ceramic sheet 211, the Z-axis represents the vibration direction of the piezoelectric ceramic sheet 211, and the intersection points X1 and X2 of Y1 and Y2 with the X-axis represent the edge position of the first electrode layer 212 on the surface of the piezoelectric ceramic sheet 211, that is, the vibration node position of the piezoelectric ceramic sheet 211. When the vibration component 21 vibrates, the piezoelectric ceramic sheet 211 located in the range X2≤X≤X1 bends and deforms under the action of the alternating electric field. The piezoelectric ceramic sheet 211 located in the range X<X2 or X>X1 does not deform actively, but is driven by the piezoelectric ceramic sheet 211 in the range X2≤X≤X1 to move in the opposite direction to the vibration direction. However, it should be noted that when X=X1 or X2, the piezoelectric ceramic sheet 211 at this position is in the plane of the X-axis, that is, the movement distance of the piezoelectric ceramic sheet 211 at this position is 0.

[0063] In summary, the deformation of the vibration component 21 is greatest at the peak position (P1, P2) of the reconstruction curve. Therefore, in the above embodiment, the air inlet of the air intake channel 201 is set to correspond to the peak position of the reconstruction curve so that the vibration component 21 and the air inlet of the air intake channel 201 can form the maximum distance when the vibration component 21 moves toward the second inner cavity wall. In this way, the air inlet of the air intake channel 201 corresponds to the position of the maximum pressure drop in the first inner cavity 2000. The air intake channel 201 can timely replenish more gas into the first inner cavity 2000 for subsequent output of the electric pump 2.

[0064] In some embodiments, since the deformation of the vibration component 21 is minimal at the nodes (X1, X2 positions) of the reconstruction curve, in the above embodiments, the air inlet of the connecting airway 204 corresponds to the vibration node position of the vibration component 21. Thus, the air inlet of the connecting airway 204 corresponds to the position of minimum gas pressure change in the first inner chamber 2000 or the second inner chamber 2001. A certain distance can always be maintained between the air inlet of the connecting airway 204 and the vibration component 21 to avoid gas stagnation and affect gas flow, so that the gas in the first inner chamber 2000 can always flow smoothly into the second inner chamber 2001, thereby increasing the gas storage in the second inner chamber 2001 and enabling the piezoelectric pump 2 to output more gas flow rate subsequently.

[0065] For reference Figures 12 to 16 In some embodiments, the dispersion structure 203 is provided on the circumferential cavity wall of the first inner cavity 2000 and / or the second inner cavity 2001. Thus, when the vibration component 21 reciprocates in the receiving cavity 200, when the vibration component 21 vibrates toward the first inner cavity wall or the second inner cavity wall, the dispersion structure 203 in the first inner cavity 2000 and / or the second inner cavity 2001 can disperse the originally regular and in-phase wall reflections into multi-directional and random phase diffuse reflections, thereby reducing the noise and additional power consumption of the sub-air pump 27 during operation.

[0066] Furthermore, since the dispersion structure 203 is located on the circumferential wall of the first inner chamber 2000 and / or the second inner chamber 2001, that is, the dispersion structure 203 is distributed circumferentially along the vibration component 21, and the surface of the dispersion structure 203 is perpendicular to the surface of the vibration component 21, and the vibration direction of the vibration component 21 is parallel to the surface extension direction of the dispersion structure 203, the dispersion structure 203 has a stronger ability to disrupt the formation of standing waves. The dispersion structure 203 mainly targets the dispersion of gas energy that does not flow along the direction of the air inlet channel 201 and the air outlet channel 202. When the vibration component 21 vibrates toward the first inner chamber wall or the second inner chamber wall, the airflow moving toward the surface of the dispersion structure 203 is dispersed into multi-directional, random phase diffuse reflection after being reflected by the surface of the dispersion structure 203, making it difficult to form standing waves. This causes most of the excess energy generated in the accommodating cavity due to the vibration of the vibration component 21 to cancel each other out, thereby reducing the noise of the sub-air pump 27 during operation and reducing the additional power consumption of the piezoelectric pump 2.

[0067] For reference Figure 7 and Figure 18In some embodiments, the sub-air pump 27 further includes a first one-way valve 22 and a second one-way valve 23. The first one-way valve 22 is disposed in the air intake channel 201. The vibration component 21 is spaced apart from and opposite to the first one-way valve 22 along the thickness direction of the piezoelectric pump 2. The first one-way valve 22 is used to control the on / off state of the air intake channel 201 and the first inner chamber 2000.

[0068] The second one-way valve 23 is located in the combined air outlet channel 26, and is spaced apart from and opposite to the vibration component 21 along the thickness direction of the pneumatic electric pump 2. The second one-way valve 23 is used to control the on / off state of the air outlet channel 202 and the second inner chamber 2001.

[0069] Specifically, the valve of the first one-way valve 22 is opened toward the vibration component 21 so that the air intake channel 201 is connected to the first inner chamber 2000, and the valve of the second one-way valve 23 is opened away from the vibration component 21 so that the second inner chamber 2001 is connected to the combined air outlet channel 26.

[0070] Thus, when the vibration assembly 21 vibrates to move toward the first inner cavity wall, the first one-way valve 22 and the second one-way valve 23 close to isolate the air intake passage 201 and the first inner cavity 2000. In this way, the gas in the first inner cavity 2000 cannot flow back from the first inner cavity 2000 to the air intake passage 201. This not only prevents the gas entering the first inner cavity 2000 from escaping, but also controls the gas flow direction, allowing the gas in the first inner cavity 2000 to enter the second inner cavity 2001 along the connecting air passage 204 for subsequent output by the electric pump 2, and creating a "primary pressurization" effect in the second inner cavity 2001.

[0071] It should be noted that when the vibration assembly 21 vibrates to move toward the first inner cavity wall, the second one-way valve 23 can remain closed because the gas in the first inner cavity 2000 flows into the second inner cavity 2001 along the connecting air passage 204. Thus, even if the volume of the second inner cavity 2001 increases, the air pressure in the second inner cavity 2001 can remain unchanged due to the replenishment of gas, so that the second inner cavity 2001 and the air outlet passage 202 maintain the same air pressure, and the pressure difference on both sides of the second one-way valve 23 approaches 0. Thus, the second one-way valve 23 remains closed, so that the gas in the second receiving cavity will not escape.

[0072] When the vibration component 21 vibrates to move toward the second inner cavity wall, the first one-way valve 22 and the second one-way valve 23 open, connecting the air inlet channel 201, the receiving inner cavity 200, and the air outlet channel 202. In this way, gas can be added to the first inner cavity 2000, and the second inner cavity 2001 can form a "secondary pressurization" effect due to the compression of its volume. After being pressurized twice, the gas flows through the second one-way valve 23 to the air outlet channel 202 so that it can be output to the gas delivery target 12, enabling the electric pneumatic pump 2 to output a larger flow rate at the same frequency.

[0073] In summary, the first one-way valve 22 and the second one-way valve 23 are designed to adapt to the vibration direction of the vibration component 21 and open and close accordingly to control the connection between the inner cavity 200 and the air inlet channel 201 and the air outlet channel 202. This significantly reduces the gas overflow rate in the first and second cavities, enabling the piezoelectric pump 2 to effectively "double pressurize" the gas entering the inner cavity 200, thereby allowing the piezoelectric pump 2 to output a larger flow rate at the same frequency.

[0074] For reference Figure 8 and Figure 19 In some embodiments, the first one-way valve 22 includes a first valve base plate 220, a first valve diaphragm 221, and a first valve cover plate 222, which are sequentially stacked along the direction close to the vibration assembly 21. The first valve diaphragm 221 includes a first fixed portion 2210 and a first movable portion 2211. The first fixed portion 2210 is connected to the first valve base plate 220. The first valve cover plate 222 is connected to the first fixed portion 2210 and is also connected to the cavity wall of the receiving cavity 200, so that the first one-way valve 22 is stably connected to the receiving cavity 200.

[0075] The first movable part 2211 is movable relative to the first valve base plate 220 and the first valve cover plate 222. When the first movable part 2211 moves toward the first valve cover plate 222, the first one-way valve 22 can connect the air intake channel 201 and the first inner chamber 2000. When the first movable part 2211 moves toward the first valve base plate 220, the one-way valve can block the air intake channel 201.

[0076] In the above embodiments, the first check valve 22 moves the first valve diaphragm 221 accordingly under the action of airflow pressure to adjust the opening and closing state of the first check valve 22. The first check valve 22 has a simple structure and low processing difficulty, which can ensure the function of the first check valve 22 in the piezoelectric pump 2 and reduce the production cost of the piezoelectric pump 2.

[0077] In some embodiments, the first valve cover plate 222 is bonded to the cavity wall of the receiving inner cavity 200. In other embodiments, the cavity wall of the receiving inner cavity 200 is provided with a slot, and the first valve cover plate 222 is located in the slot.

[0078] The above embodiments are only used to illustrate one possible approach, but do not mean that the connection relationship and structural relationship between the first valve cover plate 222 and the receiving cavity 200 can only be as described above. Other possible approaches are still feasible, and the foregoing embodiments do not impose too many constraints on this part.

[0079] For reference Figures 22 to 26 In some embodiments, the first valve cover plate 222 has a first through hole 2220 for connecting the air intake passage 201 and the receiving cavity 200.

[0080] The first fixed portion 2210 surrounds the outer periphery of the first movable portion 2211, and the first movable portion 2211 is directly opposite the first through hole 2220. The first movable portion 2211 has a second through hole 2212, the diameter of which is smaller than that of the first through hole 2220. The second through hole 2212 is used to connect to the first through hole 2220 so that the air intake passage 201 can connect to the receiving cavity 200.

[0081] The first valve base plate 220 has a third through hole 2204, at least a portion of which is disposed opposite to the first movable part 2211. The third through hole 2204 connects the first through hole 2220 and the second through hole 2212, so that the air intake passage 201 can connect to the receiving cavity 200. The first fixed part 2210 is sandwiched between the first valve cover plate 222 and the first valve base plate 220, so that the first movable part 2211 can move relative to the first valve cover plate 222 and the first valve base plate 220.

[0082] When the vibration component 21 moves toward the first one-way valve 22, the first movable part 2211 moves toward the first valve cover plate 222. The first through hole 2220, the second through hole 2212 and the third through hole 2204 connect the air intake channel 201 and the first inner chamber 2000. At this time, the first one-way valve 22 is in the open state, the air intake channel 201 connects to the first inner chamber 2000, and gas can enter the first inner chamber 2000 from the air intake channel 201.

[0083] When the vibration component 21 moves away from the first one-way valve 22, the first movable part 2211 moves toward the first valve base plate 220. The first valve base plate 220 blocks the second through hole 2212, or the first valve base plate 220 and the first movable part 2211 form a viscous gap (or slit), so that the first one-way valve 22 blocks the air intake channel 201. At this time, the first through hole 2220 and the second through hole 2212 cannot connect to the third through hole 2204, the first one-way valve 22 is in a closed state, and gas exchange cannot occur between the air intake channel 201 and the first inner chamber 2000.

[0084] It should be noted that a viscous gap (or slit) generally refers to a "tiny gap or opening closely related to the viscous effect." When a fluid (or lubricating medium) flows in this gap, the fluid (or lubricating medium) will experience significant shear resistance or energy dissipation due to viscosity. In other words, when gas flows to the viscous gap, it will experience significant damping or leakage suppression due to viscous shear. Thus, when the first valve base plate 220 and the first moving part 2211 form a viscous gap (or slit), even though the first through hole 2220 is physically connected to the second through hole 2212, from an effect perspective, it can be considered that the second through hole 2212 is not connected to the third through hole 2204. The air intake channel 201 and the first receiving cavity are blocked by the second through hole 2212 and the third through hole 2204, and gas exchange cannot occur between the first receiving cavity and the air intake channel 201.

[0085] In the above embodiment, since the first movable part 2211 is directly opposite the first through hole 2220, the diameter of the first through hole 2220 is larger than the diameter of the second through hole 2212 located in the first movable part 2211, and the third through hole 2204 is at least partially opposite the first movable part 2211, the first through hole 2220, the second through hole 2212 and the third through hole 2204 can be connected by the movement of the first movable part 2211, and the movement of the first movable part 2211 can disconnect the first through hole 2220 and the second through hole 2212 and disconnect the connection between the first through hole 2220 and the third through hole 2204, so as to control the smooth switching of the opening and closing state of the first one-way valve 22. In this embodiment, the first one-way valve 22 has a simple structure and low manufacturing difficulty (such as the difficulty of drilling holes and consideration of the correspondence of holes during installation). The first movable part 2211 in the first one-way valve 22 can also quickly and timely switch the opening and closing state of the first one-way valve 22 with changes in air pressure, so as not to hinder the gas exchange progress between the air inlet channel 201, the inner cavity 200 and the air outlet channel 202, so that the pneumatic electric pump 2 can quickly input a large amount of gas for the gas delivery target 12 to use.

[0086] In some embodiments, the first valve base plate 220 includes a plate body 2200 and a sealing platform 2201 connected to each other. The plate body 2200 is used to connect the first fixing part 2210. The plate body 2200 is annular. The sealing platform 2201 is connected to the inner side of the ring of the plate body 2200 and forms the third through hole 2204 between the sealing platform 2200 and the plate body 2200. The sealing platform 2201 is at least partially disposed opposite to the second through hole 2212 so as to be able to seal the second through hole 2212.

[0087] Since the third through hole 2204 is formed by the constraint of the plate body 2200 and the sealing platform 2201, the third through hole 2204 can correspond to the first active area. When the first valve diaphragm 221 moves toward the first valve cover plate 222, the first through hole 2220, the second through hole 2212 and the third through hole 2204 are connected.

[0088] The plate body 2200 is used to connect the first fixing part 2210 of the first valve diaphragm 221, so that the first valve cover plate 222, the first valve diaphragm 221, and the first valve base plate 220 are assembled to form a first one-way valve 22. When the first movable part 2211 moves toward the first valve base plate 220, the first valve base plate 220 blocks the second through hole 2212, or the first valve base plate 220 and the first movable part 2211 form a sticky gap (or slit), so that the first one-way valve 22 is in a closed state. At this time, the air intake passage 201 is not connected to the receiving cavity 200. When the first movable part 2211 moves toward the first valve cover plate 222, the first through hole 2220, the second through hole 2212, and the third through hole 2204 are connected, and the air intake passage 201 is connected to the receiving cavity 200, so that gas exchange can occur between the air intake passage 201 and the receiving cavity 200.

[0089] For reference Figure 23 In some embodiments, the first valve base plate 220 further includes at least one reinforcing rib 2205, the reinforcing rib 2205 being located inside the ring of the plate body 2200, and the opposite ends of the reinforcing rib 2205 being connected to the sealing platform 2201 and the plate body 2200, respectively. The reinforcing rib 2205 is used to divide the space between the plate body 2200 and the sealing platform 2201 to form at least two of the third through holes 2204.

[0090] On the one hand, the reinforcing rib 2205 connects the sealing platform 2201 and the plate body 2200, establishing a physical connection between them and strengthening the connection strength. On the other hand, the reinforcing rib 2205 improves the positional flexibility of the sealing platform 2201 relative to the plate body 2200, thereby enhancing the alignment between the sealing platform 2201 and the second through hole 2212, resulting in a better sealing effect of the sealing platform 2201 on the second through hole 2212, and thus improving the closing effect of the first one-way valve 22. Furthermore, since a connecting rib is provided between the plate body 2200 and the sealing platform 2201, the connecting rib can balance the stress state of the plate body 2200 to a certain extent, reducing the wear and tear on the plate body 2200 and extending the service life of the first one-way valve 22.

[0091] In some embodiments, such as Figure 23 As shown, the sealing platform 2201 and the plate body 2200 are concentrically arranged, with the plate body 2200 surrounding the sealing platform 2201. The plate body 2201 and the sealing platform 2201 are connected by an even number of reinforcing ribs 2205. The reinforcing ribs 2205 are evenly distributed around the outer periphery of the sealing platform 2201, so that the space of the sealing platform 2201 and the plate body 2200 is simply divided into an even number of third through holes 2204. In this way, the size of the sealing platform 2201 can match the hole size of the second through hole 2212. Even if the size of the sealing platform 2201 is too small, when the first movable part 2211 moves toward the first valve base plate 220, the sealing platform 2201 can block the second through hole 2212, or a viscous gap can be formed between the sealing platform 2201 and the second through hole 2212, so that the first one-way valve 22 is in a closed state.

[0092] For reference Figure 23 and Figure 26 In some embodiments, the sealing platform 2201 includes a platform base 2202 and a platform protrusion 2203. The platform base 2202 is connected to the plate body 2200. The platform protrusion 2203 protrudes from the surface of the platform base 2202 facing the first valve cover plate 222. The platform protrusion 2203 is used to seal the second through hole 2212, or, the platform protrusion 2203 is used to form an adhesive gap with the first valve diaphragm 221. In the natural state of the first valve diaphragm 221, the platform protrusion 2203 abuts against the first valve diaphragm 221 to a pre-tensioned state.

[0093] like Figure 23 and Figure 26As shown, the base 2202 and the protrusion 2203 are schematically distinguished by dashed lines. In the natural state of the first one-way valve 22, that is, the natural state of the first valve diaphragm 221, the protrusion 2203 can abut against the first valve diaphragm 221, so that the first valve diaphragm 221 is in a pre-tensioned state. Thus, when the pneumatic pump 2 is operating, especially when the first movable part 2211 moves toward the first valve base plate 220, the sealing platform 2201 can block the second through hole 2212. Alternatively, the protrusion 2203 is used to form a viscous gap with the first valve diaphragm 221, which improves the airtightness of the first one-way valve 22 in the closed state on the receiving cavity 200, improves the effect of the first one-way valve 22 in isolating the air intake channel 201 and the receiving cavity 200, and thus improves the pressurization effect of the pneumatic pump 2.

[0094] For reference Figures 27 to 31 In some embodiments, the first valve cover plate 222 has a first through hole 2220. The first fixed part 2210 surrounds the outer periphery of the first movable part 2211, and the first movable part 2211 is directly opposite the first through hole 2220. The first movable part 2211 includes a membrane body 2213 connected to each other, at least one membrane connecting rib 2214, and a sealing part 2215. The membrane body 2213 is annular, and the sealing part 2215 is located inside the annulus of the membrane body 2213. The opposite ends of the membrane connecting rib 2214 are respectively connected to the sealing part 2215 and the membrane body 2213, and the membrane connecting rib 2214 and the sealing part 2215 together divide the annulus of the membrane body 2213 into at least two fourth through holes.

[0095] The first valve base plate 220 has a third through hole 2204, which is disposed opposite to the sealing part 2215, and the diameter of the third through hole 2204 is smaller than the diameter of the first through hole 2220.

[0096] When the vibration component 21 moves away from the first one-way valve 22, the first movable part 2211 moves toward the first valve base plate 220 side, the blocking part 2215 blocks the third through hole 2204, or the blocking part 2215 forms a sticky gap with the first valve base plate 220, so that the first one-way valve 22 blocks the air intake passage 201.

[0097] On the one hand, the membrane connecting rib 2214 connects the sealing part 2215 and the membrane body 2213, forming a physical connection between them and strengthening the connection strength. On the other hand, the membrane connecting rib 2214 improves the flexibility of the sealing part 2215 relative to the membrane body 2213, thereby improving the alignment between the sealing part 2215 and the third through hole 2204, resulting in a better sealing effect of the sealing part 2215 on the third through hole 2204, and thus improving the closing effect of the first one-way valve 22. Furthermore, since a connecting rib is provided between the membrane body 2213 and the sealing part 2215, the connecting rib can balance the stress state of the membrane body 2213 to a certain extent, reducing the wear and tear on the membrane body 2213 and extending the service life of the first one-way valve 22.

[0098] Since the membrane connecting rib 2214 and the sealing part 2215 together divide the membrane body 2213 into at least two fourth through holes, during the processing of the first valve membrane 221, the first valve membrane 221 can be punched to form the fourth through holes. After the punching is completed, the membrane connecting rib 2214, the sealing part 2215 and the membrane body 2213 are formed at the corresponding positions of the first valve membrane 221, which reduces the processing difficulty of the first valve membrane 221.

[0099] Furthermore, the first valve diaphragm 221 can also be perforated symmetrically so that the sealing part 2215 and the diaphragm body 2213 are concentrically arranged, thereby enabling the sealing part 2215 to be directly opposite the third through hole 2204 and improving the airtightness of the first one-way valve 22.

[0100] The purpose of the blocking part 2215 in this embodiment is the same as that of the blocking platform 2201 in the previous embodiment, both being used to block the orifice structure in the first one-way valve 22 so that the first one-way valve 22 can be in a closed state. However, the difference between this embodiment and the previous embodiment is that in this embodiment, the blocking part 2215 is located on the first valve diaphragm 221, while in the previous embodiment, the blocking part 2215 is located on the first valve base plate 220. In this embodiment, by moving the first movable part 2211, the blocking part 2215 can move relative to the first valve cover plate 222 and the first valve base plate 220. By switching the positional relationship of the blocking part 2215 relative to the third through hole 2204, the blocking part 2215 can be switched to block or move away from the third through hole 2204, thereby enabling the first one-way valve 22 to switch between open and closed states.

[0101] In short, the two embodiments have different main structures for the sealing platform 2201 and different movable properties. In this embodiment, the opening and closing state of the first one-way valve 22 is adjusted by moving the sealing platform 2201, while in the aforementioned embodiment, the opening and closing state of the first one-way valve 22 is adjusted by moving the orifice structure.

[0102] In some embodiments, the first valve diaphragm 221 includes a TPU membrane, a silicone membrane, or a fiber-reinforced membrane material. The first valve diaphragm 221 made of such a membrane material is elastic, enabling the first one-way valve 22 to achieve better airtightness, thereby increasing the gas pressure in the containment cavity 200 and improving performance indicators such as the flow rate of the piezoelectric pump 2. Furthermore, the processing technology of the first valve diaphragm 221 made of this type of membrane material is simple, and its structural stability is strong, resulting in higher durability of the first one-way valve 22. Moreover, no additional specific assembly process is required for the first valve diaphragm 221 during the assembly of the first one-way valve 22. Therefore, the assembly difficulty of the first one-way valve 22 is reduced, significantly improving the production efficiency of the piezoelectric pump 2 and the assembly efficiency of the first one-way valve 22, thereby significantly saving the production cost of the piezoelectric pump 2.

[0103] In some embodiments, the second check valve 23 has the same structural features as the first check valve 22. In other words, the sub-air pump 27 manufacturer can assemble the sub-air pump 27 mentioned in the foregoing embodiments using only one type of check valve. Thus, the sub-air pump 27 can save the cost of manually finding parts by using the same type of check valve, thereby reducing the assembly cost of the sub-air pump 27.

[0104] For reference Figures 12 to 21 In some embodiments, the at least one set of sub-pumps 27 includes a first sub-pump 24 and a second sub-pump 25, wherein the combined air outlet channel 26 of the first sub-pump 24 and the combined air outlet channel 26 of the second sub-pump 25 are combined into a single combined air outlet channel 26; along the thickness direction, the air inlet channel 201 of the first sub-pump 24, the first inner chamber 2000 of the first sub-pump 24, the vibration component 21 of the first sub-pump 24, the second inner chamber 2001 of the first sub-pump 24, the combined air outlet channel 26, the second inner chamber 2001 of the second sub-pump 25, the vibration component 21 of the second sub-pump 25, the first inner chamber 2000 of the second sub-pump 25, and the air inlet channel 201 of the second sub-pump 25 are arranged sequentially.

[0105] Figure 11 A piezoelectric pump 2 with a detachable housing 20 is shown, wherein the housing 20 includes a first housing portion 205 and a second housing portion 206, which can be referred to first. Figures 12 to 16The accompanying drawings illustrate a second housing 206, which can be considered as a combination of the second housings 206 of the first sub-pump 24 and the second sub-pump 25. The illustrated second housing 206 merges the air outlet channels 202 of the first sub-pump 24 and the second sub-pump 25 into a single combined air outlet channel 26. Furthermore, by means of spacing, the connecting air channel 204 belonging to the first sub-pump 24 and the connecting air channel 204 belonging to the second sub-pump 25 are spaced apart, so that the first sub-pump 24 and the second sub-pump 25 can independently pressurize the gas entering the sub-pump 27.

[0106] like Figure 17 and Figure 21 As shown, since the outlet channels 202 of the first sub-pump 24 and the second sub-pump 25 are combined into a single outlet channel 26, that is, two sets of gas supply channels are connected in parallel in the pneumatic electric pump 2. Thus, without considering gas loss, the gas output flow rate of the pneumatic electric pump 2 is the sum of the gas output flow rates of the first sub-pump 24 and the second sub-pump 25. In short, the pneumatic electric pump 2 is equipped with multiple independent sub-pumps 27. Each of the multiple sub-pumps 27 independently completes the pressurization of the input gas and collects the pressurized gas for output to the combined outlet channel 26, enabling the pneumatic electric pump 2 to output gas flow rate and improve the operating efficiency of the pneumatic electric pump 2.

[0107] In another embodiment, the piezoelectric pump 2 includes a plurality of sub-pumps 27 arranged in series, so that the gas flow rate output by the piezoelectric pump 2 is faster and the gas pressure of the gas flow output by the piezoelectric pump 2 is increased.

[0108] It should be noted that in the aforementioned embodiments, the functions of the air inlet channel 201 and the air outlet channel 202 can be interchanged. That is, gas enters from the air outlet channel 202 (combined air outlet channel 26) and flows out from the air inlet channel 201. However, it should be noted that the valve ports of the first one-way valve 22 and the second one-way valve 23 also need to be adjusted to ensure that the gas can flow smoothly. In this way, the pneumatic electric pump 2 can be connected to multiple gas delivery targets 12 to deliver gas to multiple gas delivery targets 12 simultaneously.

[0109] In this process, due to the pressurizing effect of the sub-pump 27, even if the gas entering from the outlet channel 202 (combined outlet channel 26) is diverted to different sub-pumps 27, the gas flow rate output from the inlet channel 201 can still meet the needs of the gas delivery target 12 due to the pressurizing operation of the sub-pump 27, so that the pneumatic electric pump 2 can quickly output enough gas to the gas delivery target 12.

[0110] Please refer back. Figure 1This application also provides a gas circulation mechanism 1 applicable to a circulation device 1000. The gas circulation mechanism 1 includes a pneumatic electric pump 2, a first gas supply pipe 10, a second gas supply pipe 11, and a gas supply target 12. The first gas supply pipe 10 is connected to the inlet channel 201, and the second gas supply pipe 11 is connected to the combined outlet channel 26. The gas supply target 12 includes an inlet and an outlet. The first gas supply pipe 10 is connected to the inlet, and the second gas supply pipe 11 is connected to the outlet. A pressure relief valve 13 is connected to the second gas supply pipe 11 to control the on / off state of the gas path in the second gas supply pipe 11.

[0111] In short, in the gas circulation mechanism 1 described above, the first gas supply pipe 10 and the second gas supply pipe 11 are used to connect the electric pneumatic pump 2 and the gas supply target 12, so that an airflow passage can be formed between the electric pneumatic pump 2 and the gas supply target 12. The electric pneumatic pump 2 can perform gas supply operation on the gas supply target 12. Thus, when the electric pneumatic pump 2 is operating, the gas circulation mechanism 1 can control the opening and closing of the vent valve to regulate the amount of gas collected (stored) in the gas supply target 12, thereby adjusting the expansion (compression) of the volume of the gas supply target 12, so that the gas supply target 12 can achieve the expected effect.

[0112] Taking a breast pump for infants as an example, when a user uses the breast pump, the suction cup assembly needs to remain in close contact with the user's skin. The suction cup assembly and the user's skin mutually restrict each other, creating a sealed air storage space (equivalent to the inner cavity of the aforementioned air delivery target 12). The pneumatic pump 2 in the breast pump needs to extract the gas from this air storage space to create a negative pressure state within the suction cup assembly. The suction cup assembly remains in contact with the user's skin throughout the pumping process. To maintain a negative pressure state in the suction cup assembly during the pumping process, the pressure relief valve 13 needs to remain closed, thus ensuring the breast pump can continue pumping.

[0113] After the breast pump finishes pumping, the user needs to remove the breast pump. At this time, in order to allow the user to remove the breast pump smoothly, the pressure relief valve 13 is opened to connect the electric pump 2 and the suction cup assembly. The air pressure in the suction cup assembly increases due to the re-input of gas in the electric pump 2 until the air pressure in the electric pump 2 and the suction cup assembly are the same. Then the suction cup assembly can leave the user's skin, and the user can remove the breast pump smoothly.

[0114] It should be noted that the descriptions of each embodiment in the above embodiments have different emphases. Parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0115] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A pneumatic-electric pump, characterized in that, The piezoelectric pump includes at least one set of sub-pumps, the sub-pumps comprising: The housing includes an inner cavity, at least one air inlet channel and at least one combined air outlet channel communicating with the inner cavity, the inner cavity being connected to the external space of the housing through the air inlet channel and the combined air outlet channel, and the cavity wall of the inner cavity being provided with a dispersion structure; A vibration assembly is disposed in the receiving cavity, and the dispersion structure is used to disperse the reflected airflow from the cavity wall of the receiving cavity when the vibration assembly vibrates.

2. The piezoelectric pump as described in claim 1, characterized in that, The dispersion structure includes at least one of a protruding structure, a grooved structure, and a concave-convex structure.

3. The piezoelectric pump as described in claim 2, characterized in that, The shape of the concave-convex structure includes a wave shape, and the concave-convex structure is disposed around the periphery of the vibration component.

4. The piezoelectric pump as described in claim 1, characterized in that, The vibration assembly is peripherally connected to the circumferential cavity wall of the receiving cavity. The vibration assembly divides the receiving cavity into a first inner cavity and a second inner cavity. The first inner cavity is configured to communicate with the air inlet channel, and the second inner cavity is configured to communicate with the combined air outlet channel. The housing also includes a connecting air passage, the two ends of which are respectively connected to the first inner chamber and the second inner chamber. During the vibration of the vibration assembly, the gas in the first inner chamber can enter the second inner chamber through the connecting air passage. The accommodating cavity has a first cavity wall and a second cavity wall arranged opposite to each other along the thickness direction. The first cavity wall is located in the first inner cavity, and the second cavity wall is located in the second inner cavity. The first cavity wall and the second cavity wall are located on opposite sides of the vibration assembly, and the circumferential cavity wall of the accommodating cavity is connected between the first cavity wall and the second cavity wall.

5. The piezoelectric pump as described in claim 4, characterized in that, The distance between the first cavity wall and / or the second cavity wall and the vibrating component gradually increases from the center of the first cavity wall and / or the edge of the second cavity wall.

6. The piezoelectric pump as described in claim 4, characterized in that, The air inlet of the air intake channel corresponds to the position of the vibration peak of the vibration component; and / or, the air inlet of the connecting airway corresponds to the position of the vibration node of the vibration component.

7. The piezoelectric pump as described in claim 4, characterized in that, The dispersion structure is provided on the circumferential cavity wall of the first inner chamber and / or the second inner chamber.

8. The piezoelectric pump as described in claim 4, characterized in that, The sub-pump further includes a first check valve and a second check valve. The first check valve is located in the air inlet channel. The vibration component is spaced apart from and opposite to the first check valve along the thickness direction of the pneumatic pump. The second check valve is located in the combined air outlet channel, and the second check valve is spaced apart from and opposite to the vibration component along the thickness direction of the pneumatic pump; The first one-way valve opens towards the vibration assembly to connect the air intake channel to the first inner chamber, while the second one-way valve opens away from the vibration assembly to connect the second inner chamber to the combined air outlet channel.

9. The piezoelectric pump as described in claim 8, characterized in that, The first one-way valve includes a first valve base plate, a first valve diaphragm, and a first valve cover plate that are sequentially stacked and connected along the direction close to the vibration component. The first valve diaphragm includes a first fixed part and a first movable part. The first fixed part is connected to the first valve base plate. The first valve cover plate is connected to the first fixed part and is also connected to the cavity wall of the receiving cavity. The first movable part is movable relative to the first valve base plate and the first valve cover plate. When the first movable part moves toward the first valve cover plate, the first one-way valve can connect the air intake channel and the first inner chamber. When the first movable part moves toward the first valve base plate, the one-way valve can block the air intake channel.

10. The piezoelectric pump as described in claim 9, characterized in that, The first valve cover plate has a first through hole; The first fixed part surrounds the outer periphery of the first movable part, and the first movable part is directly opposite the first through hole; The first movable part has a second through hole, the diameter of which is smaller than that of the first through hole; The first valve base plate has a third through hole, at least a portion of which is disposed opposite to the first movable part; the first fixed part is sandwiched between the first valve cover plate and the first valve base plate; When the vibration component moves toward the first one-way valve, the first movable part moves toward the first valve cover plate side, and the first through hole, the second through hole and the third through hole connect the air intake channel and the first inner chamber. When the vibration component moves away from the first one-way valve, the first movable part moves toward the first valve base plate side, and the first valve base plate blocks the second through hole, or the first valve base plate and the first movable part form a sticky gap, so that the first one-way valve blocks the air intake passage.

11. The piezoelectric pump as described in claim 10, characterized in that, The first valve base plate includes a plate body and a sealing platform connected to each other. The plate body is used to connect to the first fixing part. The plate body is annular. The sealing platform is connected to the inner side of the ring of the plate body and forms the third through hole between the sealing platform and the plate body. The sealing platform is at least partially positioned opposite the second through hole to seal the second through hole.

12. The piezoelectric pump as described in claim 11, characterized in that, The first valve base plate also includes at least one reinforcing rib, which is located inside the ring of the plate body, and the opposite ends of the reinforcing rib are respectively connected to the sealing platform and the plate body; The reinforcing ribs are used to divide the space between the plate body and the sealing platform to form at least two of the third through holes.

13. The piezoelectric pump as described in claim 10, characterized in that, The sealing platform includes a platform base and a platform protrusion. The platform base is connected to the plate body. The platform protrusion protrudes from the surface of the platform base facing the side where the first valve cover plate is located. The platform protrusion is used to seal the second through hole, or the platform protrusion is used to form an adhesive gap with the first valve diaphragm. In the natural state of the first valve diaphragm, the protruding portion abuts against the first valve diaphragm to a pre-tensioned state.

14. The piezoelectric pump as described in claim 9, characterized in that, The first valve cover plate has a first through hole; The first fixed part surrounds the outer periphery of the first movable part, and the first movable part is directly opposite the first through hole; the first movable part includes a membrane body, at least one membrane connecting rib and a sealing part connected to each other, the membrane body is annular, the sealing part is located inside the annulus of the membrane body, the opposite ends of the membrane connecting rib are respectively connected to the sealing part and the membrane body, and the membrane connecting rib and the sealing part together divide the annulus of the membrane body into at least two fourth through holes; The first valve base plate has a third through hole, which is disposed directly opposite the sealing part, and the diameter of the third through hole is smaller than the diameter of the first through hole; When the vibration component moves away from the first one-way valve, the first movable part moves toward the first valve base plate side, the sealing part blocks the third through hole, or the sealing part forms a sticky gap with the first valve base plate, so that the first one-way valve blocks the air intake passage.

15. The piezoelectric pump as described in claim 9, characterized in that, The first valve membrane includes a TPU membrane, a silicone membrane, or a membrane material reinforced with fibers.

16. The piezoelectric pump as claimed in claim 1, characterized in that, The vibration component includes a piezoelectric ceramic sheet, a first electrode layer, and a second electrode layer. The first electrode layer and the second electrode layer are located on the end face and side face of the piezoelectric ceramic sheet, respectively, and the first electrode layer and the second electrode layer are spaced apart.

17. The piezoelectric pump as described in claim 16, characterized in that, The piezoelectric ceramic sheet is a circular sheet with a radius of R; The distance between the edge of the first electrode layer and the center of the piezoelectric ceramic sheet is 0.63*R*(1±0.2).

18. The piezoelectric pump as described in claim 16, characterized in that, The vibration assembly also includes an FPC, which includes a plurality of welded portions arranged in a ring. The plurality of welded portions are arranged around the periphery of the piezoelectric ceramic sheet, and the plurality of welded portions are welded to and electrically connected to the second electrode layer by spot welding.

19. The piezoelectric pump according to any one of claims 1-18, characterized in that, The at least one set of sub-pumps includes a first sub-pump and a second sub-pump, wherein the combined air outlet channel of the first sub-pump and the combined air outlet channel of the second sub-pump are merged into a single combined air outlet channel; along the thickness direction, the air inlet channel of the first sub-pump, the first inner chamber of the first sub-pump, the vibration component of the first sub-pump, the second inner chamber of the first sub-pump, the combined air outlet channel, the second inner chamber of the second sub-pump, the vibration component of the second sub-pump, the first inner chamber of the second sub-pump, and the air inlet channel of the second sub-pump are arranged sequentially.

20. A gas circulation mechanism, characterized in that, include: The piezoelectric pump as described in any one of claims 1-19; A first gas supply pipe, which is connected to the air intake channel; The second gas supply pipe is connected to the combined gas outlet channel; A gas delivery target, the gas delivery target including an air inlet and an air outlet, the first gas delivery pipe being connected to the air inlet, and the second gas delivery pipe being connected to the air outlet; as well as A pressure relief valve is connected to the second gas supply pipe to control the opening and closing of the gas path in the second gas supply pipe.

21. A circulation device, characterized in that, Includes the piezoelectric pump as described in any one of claims 1 to 17, or the gas circulation mechanism as described in claim 20.

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