One-way valve and one-way piezoelectric negative pressure pump

Abstract

The utility model belongs to the technical field of liquid variable-capacity machinery, and particularly relates to the technical field of liquid variable-capacity machinery with plate-shaped flexible pieces, in particular to a one-way valve and a one-way piezoelectric negative pressure pump. According to the one-way valve and the one-way piezoelectric negative pressure pump, the flow guide diaphragm is positioned through the blind hole formed in the upper flow guide piece, that is, after the inner surface of the upper flow guide piece is covered with the flow guide diaphragm, the position, at the blind hole, of the flow guide diaphragm is punched in a laser punching mode so as to form a diaphragm hole, and therefore the diaphragm hole and the flow guide hole can be accurately staggered; by means of the flow guide holes formed in the upper flow guide piece and the lower flow guide piece, when airflow flows in from the upper flow guide piece, the flow guide diaphragm is pushed to bulge after passing through the flow guide holes in the upper flow guide piece, then the airflow penetrates through the diaphragm holes in the flow guide diaphragm and flows out from the flow guide holes in the lower flow guide piece, and one-way conduction of the airflow is achieved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to liquid variable volume type mechanical technical field, specifically related to liquid variable volume type mechanical technical field with plate -shaped flexible member, especially related to a one-way valve and one-way piezoelectric negative pressure pump. BACKGROUND

[0002] The piezoelectric negative pressure pump in the related art utilizes the characteristics of piezoelectric ceramics to generate vibration, and cooperates with a one-way valve to form a one-way negative pressure. The vibration of the piezoelectric ceramics generates a negative pressure to suck air flow, and the one-way valve controls the flow direction of the air flow, thereby forming a stable one-way output function.

[0003] Since the one-way piezoelectric negative pressure pump is usually a miniature device, the one-way valve usually cooperates with an air outlet sheet through a set of diaphragm to realize the negative pressure function. For example, the related technology disclosed in the patent No. CN117189554A discloses a sound pressure pump, a working method and an application device, and specifically discloses that the first one-way valve and the second one-way valve respectively include a first plate, a valve flap, a ring body and a second plate connected in sequence along the thickness direction, the first plate, the ring body and the second plate together enclose a valve cavity providing a deformation space for the valve flap, the first plate is provided with a plurality of first plate holes at the position opposite to the valve cavity, the second plate is provided with a plurality of second plate holes one and a plurality of second plate holes two at the position opposite to the valve cavity, and the valve flap is provided with a plurality of valve flap holes at the part located in the valve cavity, the valve flap holes are staggered with the first plate holes and aligned with the second plate holes one, and the second plate holes two are aligned with the first plate holes.

[0004] In the above technical scenario, the one-way conduction of the air flow is realized by relying on the staggered cooperation of the plate holes and the valve flap holes. However, since the diaphragm flap is a miniature structure, the hole diameter is usually only 0.1mm-0.4mm, so it is difficult to achieve a good hole position staggering effect during assembly.

[0005] Therefore, there is an urgent need to provide a one-way valve and a one-way piezoelectric negative pressure pump to solve the technical problem of not easy to accurately realize the hole position staggering effect in the related art.

[0006] It should be noted that the above information disclosed in the background section of the present application is only used to understand the background technology of the present application, and therefore, the above description is not considered to constitute the information of the prior art. UTILITY MODEL CONTENT

[0007] The embodiments of the present disclosure at least provide a one-way valve, which comprises a flow guide upper sheet, a flow guide lower sheet and a flow guide diaphragm; the flow guide diaphragm is located between the flow guide upper sheet and the flow guide lower sheet; the flow guide upper sheet is provided with a plurality of blind holes for positioning the flow guide diaphragm; the flow guide upper sheet and the flow guide lower sheet are both provided with a plurality of flow guide holes, and the flow guide diaphragm is provided with a plurality of diaphragm holes corresponding to the positions of the blind holes; wherein the flow guide diaphragm is only inflated when the air flow flows from the flow guide upper sheet to the flow guide lower sheet, so that the air flow passes through the diaphragm holes.

[0008] In an optional embodiment, the guide holes and the blind holes on the guide upper plate are arranged at staggered intervals; and the diameter of the guide holes is not less than the diameter of the blind holes.

[0009] In an optional embodiment, the number of guide holes on the guide lower piece is the sum of the number of guide holes and blind holes on the guide upper piece; and the positions of the guide holes on the guide lower piece and the guide holes and blind holes on the guide upper piece correspond to each other.

[0010] In an optional embodiment, the one-way valve also includes: a support plate, which is arranged between the guide diaphragm and the guide lower plate; and the support plate is suitable for pressing the guide diaphragm onto the inner surface of the guide upper plate; wherein a group of guide windows are symmetrically arranged on the support plate; the position of the guide window on the guide upper plate corresponding to the guide window is the opening area of ​​its guide hole and blind hole; and the position of the guide window on the guide lower plate corresponding to the guide window is the opening area of ​​its guide hole.

[0011] In an optional embodiment, the bulging height of the guide membrane is equal to the thickness of the support sheet.

[0012] The disclosed embodiment provides at least another one-way valve, comprising: a guide upper piece, a guide lower piece, a guide diaphragm and a support piece; the guide diaphragm is located between the guide upper piece and the guide lower piece; the support piece is arranged between the guide diaphragm and the guide lower piece; wherein a guide window is provided on the support piece, and a plurality of blind holes are provided on the guide upper piece; and a plurality of guide holes are provided on both the guide upper piece and the guide lower piece, and a plurality of membrane holes corresponding to the positions of the blind holes are provided on the guide diaphragm; wherein the guide diaphragm bulges only when the airflow flows from the guide upper piece to the guide lower piece, so that the airflow flows into the guide upper piece and then flows out of the guide lower piece through the membrane holes and the guide window.

[0013] In an optional embodiment, the guide holes and the blind holes on the guide upper plate are arranged at staggered intervals; and the diameter of the guide holes is not less than the diameter of the blind holes.

[0014] In an optional embodiment, the number of guide holes on the guide lower piece is the sum of the number of guide holes and blind holes on the guide upper piece; and the positions of the guide holes on the guide lower piece and the guide holes and blind holes on the guide upper piece correspond to each other.

[0015] The embodiment of the present disclosure provides at least one-way piezoelectric negative pressure pump, comprising: the above-mentioned one-way valve; and a pump body, which is provided with a piezoelectric ceramic vibration mechanism inside; wherein the number of the one-way valves is 2, and they are respectively located on the upper and lower sides of the piezoelectric ceramic vibration mechanism; and the one-way valve located above the piezoelectric ceramic vibration mechanism is an exhaust one-way valve, which is embedded in the exhaust pipe of the upper shell of the pump body; the one-way valve located below the piezoelectric ceramic vibration mechanism is an exhaust one-way valve, which is embedded in the exhaust pipe of the lower shell of the pump body.

[0016] In an optional embodiment, the piezoelectric ceramic vibration mechanism includes: a vibrator, a flexible circuit board and a piezoelectric ceramic sheet; and the three are stacked from top to bottom.

[0017] The beneficial effect of the present utility model is that the one-way valve and the one-way piezoelectric negative pressure pump realize the positioning of the guide diaphragm by the blind hole provided on the guide upper piece, that is, after the guide diaphragm is covered on the inner surface of the guide upper piece, the guide diaphragm at the blind hole position is punched by laser to form a membrane hole, so that the membrane hole and the guide hole are precisely staggered, and through the guide holes opened on the guide upper piece and the guide lower piece, when the airflow flows in from the guide upper piece, it pushes the guide diaphragm to bulge after passing through the guide holes on the guide upper piece, and then passes through the membrane holes on the guide diaphragm and flows out from the guide holes on the guide lower piece, thereby realizing the one-way conduction of the airflow.

[0018] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description and the drawings.

[0019] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A schematic diagram of the explosion structure of a one-way valve provided in an embodiment of the present disclosure is shown;

[0022] Figure 2 A schematic structural diagram of a flow guide upper plate in a one-way valve provided by an embodiment of the present disclosure is shown;

[0023] Figure 3 A schematic structural diagram of a guide lower piece in a one-way valve provided in an embodiment of the present disclosure is shown;

[0024] Figure 4 A schematic structural diagram of a guide diaphragm in a one-way valve provided by an embodiment of the present disclosure is shown;

[0025] Figure 5 A schematic structural diagram of a support plate in a one-way valve provided by an embodiment of the present disclosure is shown;

[0026] Figure 6 A schematic diagram of the three-dimensional structure of a one-way valve provided in an embodiment of the present disclosure is shown;

[0027] Figure 7 A schematic diagram of an air intake conduction state of a one-way valve provided by an embodiment of the present disclosure is shown;

[0028] Figure 8 A schematic diagram of a one-way valve in an air outlet blocking state according to an embodiment of the present disclosure is shown;

[0029] Figure 9 A schematic diagram of the explosion structure of the unidirectional piezoelectric negative pressure pump provided in an embodiment of the present disclosure is shown.

[0030] In the picture:

[0031] The guide upper piece 1, the blind hole 10, the guide lower piece 2, the guide diaphragm 3, the membrane hole 30, the support piece 4, the guide window 40, the guide hole 5, the upper shell 61, the air outlet pipe 611, the lower shell 62, the air inlet pipe 621, the piezoelectric ceramic vibration mechanism 7, the vibrator 71, the flexible circuit board 72, and the piezoelectric ceramic piece 73. DETAILED DESCRIPTION

[0032] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0033] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. In addition, in the drawings, the thickness of components may be exaggerated or reduced in order to effectively describe the technical content.

[0034] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0035] See also Figure 1 and Figure 6 , Figure 1 and Figure 6 A one-way valve is shown, comprising: a guide upper piece 1, a guide lower piece 2 and a guide diaphragm 3; the guide diaphragm 3 is located between the guide upper piece 1 and the guide lower piece 2; and the blind hole 10 provided on the guide upper piece 1 realizes the positioning of the guide diaphragm 3, that is, after the guide diaphragm 3 is covered on the inner surface of the guide upper piece 1, the guide diaphragm 3 at the position of the blind hole 10 is punched by laser to form a membrane hole 30, so that the membrane hole 30 and the guide hole 5 are precisely staggered.

[0036] See also Figure 2 and Figure 4 In some embodiments, since the guide membrane 3 is attached to the inner surface of the guide upper sheet 1, and the membrane holes 30 on the guide membrane 3 and the guide holes 5 on the guide upper sheet 1 are staggered, see Figure 7 When the air flows in from the guide upper sheet 1, the air will pass through the guide holes 5 on the guide upper sheet 1 along the F direction and push the guide membrane 3 to bulge, then pass through the membrane holes 30 on the guide membrane 3 and flow out from the guide holes 5 on the guide lower sheet 2. For details, see Figure 8 If the airflow flows in from the guide lower sheet 2 along the F direction, the airflow will push the guide membrane 3 to stick tightly to the guide upper sheet 1, so that the airflow cannot pass through the guide upper sheet 1, thereby achieving unidirectional conduction of the airflow.

[0037] See also Figure 3 and Figure 5 In some embodiments, in order to enable the guide diaphragm 3 to bulge, a support sheet 4 is provided between the guide diaphragm 3 and the guide lower sheet 2, and a group of guide windows 40 are symmetrically opened on the support sheet 4. The guide windows 40 correspond to the positions of the membrane holes 30, so that the guide diaphragm 3 can bulge toward the support sheet 4, and the bulging height of the guide diaphragm 3 is adapted to the thickness of the support sheet 4, that is, the guide windows 40 provide a bulging space for the guide diaphragm 3.

[0038] In some embodiments, the number of guide holes 5 on the lower guide sheet 2 is the sum of the number of guide holes 5 and blind holes 10 on the upper guide sheet 1; and the positions of the guide holes 5 on the lower guide sheet 2 correspond to the positions of the guide holes 5 and blind holes 10 on the upper guide sheet 1. Specifically, the guide holes 5 on the lower guide sheet 2 cover the guide holes 5 on the upper guide sheet 1 and the membrane holes 30 on the guide membrane 3. Therefore, airflow can flow smoothly out of the lower guide sheet 2. Moreover, the guide holes 5 on the lower guide sheet 2 are the largest in number, which can effectively increase gas flow and reduce airflow loss.

[0039] See also Figures 1 to 8 ,Figures 1 to 8 Another one-way valve is also provided, comprising: a guide upper piece 1, a guide lower piece 2, a guide diaphragm 3 and a support piece 4; the guide diaphragm 3 is located between the guide upper piece 1 and the guide lower piece 2; the support piece 4 is arranged between the guide diaphragm 3 and the guide lower piece 2; wherein the support piece 4 is provided with a guide window 40, and the guide upper piece 1 is provided with a plurality of blind holes 10; and the guide upper piece 1 and the guide lower piece 2 are both provided with a plurality of guide holes 5, and the guide diaphragm 3 is provided with a plurality of blind holes. 10 corresponding to the membrane hole 30; wherein the guide membrane 3 bulges only when the airflow flows from the guide upper sheet 1 to the guide lower sheet 2, so that the airflow flows into the guide upper sheet 1 and then flows out of the guide lower sheet 2 through the membrane hole 30 and the guide window 40, and the number of the guide holes 5 on the guide lower sheet 2 is the sum of the number of the guide holes 5 on the guide upper sheet 1 and the blind holes 10; the positions of the guide holes 5 on the guide lower sheet 2 and the guide holes 5 and the blind holes 10 on the guide upper sheet 1 correspond to each other.

[0040] See also Figure 9 , Figure 9 A unidirectional piezoelectric negative pressure pump is provided, comprising: the aforementioned one-way valve and a pump body, wherein a piezoelectric ceramic vibration mechanism 7 is disposed within the pump body; wherein the number of the one-way valves is two, and they are located on the upper and lower sides of the piezoelectric ceramic vibration mechanism 7; wherein the one-way valve located above the piezoelectric ceramic vibration mechanism 7 is an outlet one-way valve, which is embedded in an outlet pipe 611 of the pump body upper shell 61; and the one-way valve located below the piezoelectric ceramic vibration mechanism 7 is an inlet one-way valve, which is embedded in an inlet pipe 621 of the pump body lower shell 62. Specifically, there are two outlet pipes 611, and the number of inlet pipes may also be two.

[0041] As a preferred embodiment, the piezoelectric ceramic vibration mechanism 7 includes: a vibrator 71, a flexible circuit board 72 and a piezoelectric ceramic sheet 73; and the three are stacked from top to bottom.

[0042] As another optional embodiment, the piezoelectric ceramic vibration mechanism may adopt a vibration device in the prior art.

[0043] To sum up, the one-way valve and the one-way piezoelectric negative pressure pump realize the positioning of the guide diaphragm by the blind hole provided on the guide upper piece, that is, after the guide diaphragm is covered on the inner surface of the guide upper piece, the guide diaphragm at the blind hole position is punched by laser to form a membrane hole, so that the membrane hole and the guide hole are precisely staggered, and through the guide holes opened on both the guide upper piece and the guide lower piece, when the airflow flows in from the guide upper piece, it pushes the guide diaphragm to bulge after passing through the guide holes on the guide upper piece, and then passes through the membrane holes on the guide diaphragm and flows out from the guide holes on the guide lower piece, thereby realizing the one-way conduction of the airflow.

[0044] In this document, when a first component is referred to as being "on" a second component, it can be directly on the second component or intervening components can be present. In contrast, when a first component is referred to as being "directly on" a second component, there are no intervening components present. Other words used to describe the relationship between elements should be interpreted in a like fashion (e.g., "between" versus "directly between," "adjacent" versus "directly adjacent," etc.). As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0045] In this document, when an element or layer is referred to as being "on" another element or layer, it can be directly on the other element or layer, or intervening elements or layers can be present. In contrast, when an element is referred to as being "directly on" another element or layer, there are no intervening elements or layers present. Other words used to describe the relationship between elements should be interpreted in a like fashion (e.g., "between" versus "directly between," "adjacent" versus "directly adjacent," etc.). As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0046] In this document, example embodiments of the disclosure are described in more detail with reference to the accompanying drawings. As used herein, such as the expression "at least one of," when preceding a list of two or more items, modifies the entire list of items and does not modify the individual items of the list. For example, the expression "at least one of a, b, and c" should be understood as including only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0047] The terminology used herein is for the purpose of describing particular example configurations only and is not intended to be limiting. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," and "including" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order

[0048] As used herein, the phrases "in one embodiment," "according to one embodiment," "in some embodiments," and the like generally refer to the fact that the particular feature, structure, or characteristic following the phrase may be included in at least one embodiment of the present disclosure. Thus, a particular feature, structure, or characteristic may be included in more than one embodiment of the present disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms "example," "exemplary," and the like are used to "serve as an example, instance, or illustration." Any implementation, aspect, or design described herein as "example" or "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations, aspects, or designs. Instead, the use of the terms "example," "exemplary," and the like is intended to present concepts in a concrete manner.

[0049] In the description of the embodiments of the present invention, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0050] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, terms such as "first", "second" and other numerical terms do not imply an order or sequence when used herein unless expressly indicated above. Therefore, without departing from the teachings of the example embodiments, the first element, component, region, layer or section discussed above may be referred to as a second element, component, region, layer or section.

[0051] Spatially relative terms, such as "inner," "outer," "beneath," "below," "lower," "above," "upper," and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. Spatially relative terms can be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the example term "below" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0052] In the above discussion, unless otherwise stated, the terms "about," "approximately," "substantially" and the like mean a + / - % variation of the value.

[0053] With the above ideal embodiments according to the present application as the inspiration, through the above description, relevant staff can definitely make various changes and modifications without deviating from the technical thought of the present application. The technical scope of the present application is not limited to the content in the specification, and must be determined according to the scope of claims.

Claims

1. A one-way valve, characterized in that: include: A guide upper piece (1), a guide lower piece (2) and a guide membrane (3); The guide membrane (3) is located between the guide upper sheet (1) and the guide lower sheet (2); The guide upper sheet (1) is provided with a plurality of blind holes (10) for positioning the guide membrane (3); and The guide upper sheet (1) and the guide lower sheet (2) are both provided with a plurality of guide holes (5), and the guide membrane sheet (3) is provided with a plurality of membrane holes (30) corresponding to the positions of the blind holes (10); and The guide membrane (3) bulges only when the airflow flows from the guide upper sheet (1) to the guide lower sheet (2), so that the airflow passes through the membrane holes (30).

2. The one-way valve according to claim 1, wherein: The guide holes (5) and the blind holes (10) on the guide upper plate (1) are arranged in a staggered manner; and The diameter of the guide hole (5) is not less than the diameter of the blind hole (10).

3. The one-way valve according to claim 2, wherein: The number of the guide holes (5) on the guide lower plate (2) is the sum of the number of the guide holes (5) and the blind holes (10) on the guide upper plate (1); and The guide holes (5) on the guide lower piece (2) and the guide holes (5) on the guide upper piece (1) correspond to the positions of the blind holes (10).

4. The one-way valve according to claim 3, wherein: Also includes: A support sheet (4), the support sheet (4) being arranged between the guide membrane sheet (3) and the guide lower sheet (2); as well as The support sheet (4) is suitable for pressing the guide membrane (3) onto the inner surface of the guide upper sheet (1); wherein A group of guide windows (40) are symmetrically arranged on the support plate (4); The position on the guide upper plate (1) corresponding to the guide window (40) is the area where the guide hole (5) and the blind hole (10) are opened; and The position on the guide lower plate (2) corresponding to the guide window (40) is the area where the guide hole (5) is opened.

5. The one-way valve according to claim 4, wherein: The bulging height of the guide membrane (3) is equal to the thickness of the support sheet (4).

6. A one-way valve, characterized in that: include: A guide upper piece (1), a guide lower piece (2), a guide membrane piece (3), and a support piece (4); The guide membrane (3) is located between the guide upper sheet (1) and the guide lower sheet (2); The support sheet (4) is arranged between the guide membrane sheet (3) and the guide lower sheet (2); wherein The support sheet (4) is provided with a guide window (40), and the guide upper sheet (1) is provided with a plurality of blind holes (10); and The guide upper sheet (1) and the guide lower sheet (2) are both provided with a plurality of guide holes (5), and the guide membrane sheet (3) is provided with a plurality of membrane holes (30) corresponding to the positions of the blind holes (10); and The guide membrane (3) bulges only when the airflow flows from the guide upper sheet (1) to the guide lower sheet (2), so that the airflow flows into the guide upper sheet (1), passes through the membrane hole (30) and the guide window (40), and then flows out of the guide lower sheet (2).

7. The one-way valve according to claim 6, wherein: The guide holes (5) and the blind holes (10) on the guide upper plate (1) are arranged in a staggered manner; and The diameter of the guide hole (5) is not less than the diameter of the blind hole (10).

8. The one-way valve according to claim 7, wherein: The number of the guide holes (5) on the guide lower plate (2) is the sum of the number of the guide holes (5) and the blind holes (10) on the guide upper plate (1); and The guide holes (5) on the guide lower piece (2) and the guide holes (5) on the guide upper piece (1) correspond to the positions of the blind holes (10).

9. A one-way piezoelectric negative pressure pump, characterized in that: include: The one-way valve according to claim 1 or 6; and The pump body has a piezoelectric ceramic vibration mechanism (7) disposed therein; wherein The number of the one-way valves is two, and they are respectively located on the upper and lower sides of the piezoelectric ceramic vibration mechanism (7); and The one-way valve located above the piezoelectric ceramic vibration mechanism (7) is an air outlet one-way valve, which is embedded in the air outlet pipe (611) of the upper shell (61) of the pump body; The one-way valve located below the piezoelectric ceramic vibration mechanism (7) is an air intake one-way valve, which is embedded in the air intake pipe (621) of the lower shell (62) of the pump body.

10. The one-way piezoelectric negative pressure pump according to claim 9, characterized in that: The piezoelectric ceramic vibration mechanism (7) comprises: A vibrator (71), a flexible circuit board (72) and a piezoelectric ceramic sheet (73); and The three are stacked from top to bottom.

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