Micro air pressure regulating valve

Abstract

The present invention relates to a micro air pressure regulating valve, comprising a housing and an air pump arranged in the housing; a sealed cavity is arranged in the housing, and the sealed cavity is provided with an air inlet and an air outlet; the air pump adopts a micro piezoelectric pump, and the air inlet of the air pump is connected to the air inlet of the sealed cavity, and the air outlet of the air pump is connected to the air outlet of the sealed cavity. The micro air pressure regulating valve is easy to use, small in size and weight, low in noise, excellent in air tightness and energy-saving due to the design of the sealed cavity and the micro piezoelectric pump.

Description

Technical Field

[0001] The invention relates to the field of air pressure valves, and in particular to a miniature air pressure regulating valve. Background Art

[0002] A small pressure valve is a valve with a smaller valve type, usually used in negative pressure and low pressure gas pipeline systems to control and regulate gas flow. A small pressure valve is an important gas flow control device, widely used in various fields such as production, scientific research, and medical treatment. It is often used to control and regulate gas flow in laboratories, hospitals, factories and other scenes. In addition, small pressure valves can also be used in the fields of automobiles, machinery, electronic appliances, etc.

[0003] At present, all small air pressure valves use air pumps including vacuum pumps as core power parts, and air pumps use motors as power output adjustment devices. Therefore, the current small air pressure valves have the following disadvantages: 1. Large size. Since a motor and a housing for the motor are required, the size is generally large and the weight is heavy. The smallest size is the size of a palm and the thickness is 5-10cm. At the same time, it cannot be conveniently carried and cannot be applied in many small space scenes. 2. The noise is large. Due to the use of air pumps with motors, the noise is mostly 60 decibels, and the noise pollution is high. 3. Due to the use of motors, the power consumption is large and the power consumption is large. The sustainability in mobile use scenarios is low, and the cost of use is high. 4. Due to the structure of the motor, the small air pressure valve needs to be connected to the use scenario through a pipeline, which increases the use cost. At the same time, due to the existence of the pipeline, it is easy to leak air, resulting in poor air tightness. 5. It is impossible to accurately change the pressure value according to the change of external temperature to adapt to special application scenarios.

[0004] Especially in the medical and cosmetic fields, negative pressure therapy and negative pressure beauty have become emerging medical and aesthetic technologies. For example, negative pressure wound dressings used for wound recovery use a small air pressure valve as the core component of the negative pressure regulator. The negative pressure regulator is connected to the wound dressing through a connecting tube to control the closed wound to be in a negative pressure environment to facilitate recovery. The current small air pressure valve of this type of product uses a vacuum pump as the regulating power part. Therefore, in addition to the shortcomings of the aforementioned small air pressure valve, there are also the following shortcomings in this application scenario: 1. Due to the existence of the connecting tube, it is inconvenient to carry. 2. It is also necessary to add an additional one-way valve in the connecting pipeline, and the negative pressure state cannot be maintained for a long time, which causes the negative pressure instrument to work continuously and consumes a lot of power. 3. The negative pressure instrument will continue to leak and has poor airtightness. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a miniature air pressure regulating valve which is easy to use, small in size and weight, low in noise, excellent in air tightness and energy-saving.

[0006] One of the technical solutions to achieve the purpose of the present invention is to provide a miniature air pressure regulating valve, including a shell and an air pump arranged in the shell; a sealed cavity is provided in the shell, and the sealed cavity is provided with an air inlet and an air outlet; the air pump adopts a miniature piezoelectric pump, the air inlet hole of the air pump is connected to the air inlet of the sealed cavity, and the air outlet hole of the air pump is connected to the air outlet of the sealed cavity.

[0007] Furthermore, the micro air pressure regulating valve also includes a PCBA circuit board; the PCBA circuit board is electrically connected to the air pump; the shell includes a lower shell; the lower shell is provided with a ventilation chamber opening upward; the PCBA circuit board is sealed on the ventilation chamber to cover the ventilation chamber to form a sealed cavity.

[0008] Furthermore, the air pump is arranged in the sealed cavity, and the air pump separates the sealed cavity into an air inlet cavity and an air outlet cavity.

[0009] Furthermore, the micro air pressure regulating valve also includes a sealing layer; a generally U-shaped pad is provided above the left front, front and right front edges of the bottom plate of the ventilation chamber; the air pump is provided with an air inlet and an air outlet respectively located on the upper and lower end surfaces; the lower shell is provided with a first air vent; the PCBA circuit board is provided with a second air vent; the air pump is electrically connected to the PCBA circuit board, and the air outlet or air inlet of the air pump is directly opposite to the second air vent, and the air pump is assisted by the sealing layer to be fixed on the PCBA circuit board and the sealing layer is at least around the second air vent The hole is air-sealed around; the PCBA circuit board is sealed and arranged above the ventilation chamber of the lower shell, and the PCBA circuit board is air-sealed to the peripheral wall of the ventilation chamber; and the air pump is located in the front middle part of the ventilation chamber, and is located above the U-shaped pad, the pad supports the three left front middle edge parts of the lower end face of the air pump so that there is a ventilation gap equivalent to the thickness of the pad between the lower end face of the air pump and the bottom plate of the ventilation chamber, then relative to the second ventilation hole, the air inlet or outlet of the air pump is connected with the first ventilation hole.

[0010] Furthermore, a ventilation seat is provided above the rear inner bottom plate of the ventilation chamber, a columnar connecting head is provided in the center of the ventilation seat, a first ventilation hole is provided in the center of the ventilation seat which passes through from top to bottom, an annular ventilation expansion groove is provided around the first ventilation hole on the upper end surface of the ventilation seat, and a trumpet-shaped transition with a larger top and a smaller bottom is adopted between the ventilation expansion groove and the first ventilation hole.

[0011] Furthermore, the micro air pressure regulating valve further comprises a breathable membrane; the breathable membrane is disc-shaped; the vent seat is columnar and opens downward; the vent seat has a disc-shaped breathable membrane groove by providing a peripheral wall, so that the bottom surface of the breathable membrane groove and the bottom surface of the ventilation expansion groove are in a stepped shape with a high outside and a low inside; three inverted trapezoidal expansion grooves are evenly spaced on the peripheral wall of the upper end surface of the vent seat;

[0012] The size of the breathable membrane corresponds to the size of the breathable membrane groove; the breathable membrane is adhesively arranged in the breathable membrane groove of the lower shell.

[0013] Furthermore, the vent seat is connected to the corresponding inner wall of the ventilation chamber by its rear and left parts, and the upper end face of the vent seat is provided with an upwardly protruding step portion around the first vent hole to form an annular ventilation expansion groove and a square expansion groove extending from the ventilation expansion groove to the front and right.

[0014] Furthermore, the lower shell is square with an opening upward, and a circle of first support parts is provided on the inner side of the peripheral wall of the lower shell, the first support parts are higher than the peripheral wall of the lower shell, and the lower shell is divided into two spaces opening upward by a first partition plate which is the same height as the first support part, wherein the space on the left side is the battery chamber, and the space on the right side is divided into a ventilation chamber located in the middle right part of the lower shell and a power interface chamber located in the right rear part of the lower shell by an L-shaped second partition plate which is lower than the first support part and is arranged on the right rear side, so that the battery chamber is square, the power interface chamber is square, and the ventilation chamber is L-shaped when viewed from above.

[0015] Furthermore, the sealing layer adopts an annular waterproof double-sided tape or soft glue; the sealing layer is adhesively arranged between the upper end surface of the air pump and the lower end surface of the PCBA circuit board, and the hollow inside of the sealing layer surrounds the air outlet or air inlet hole corresponding to the air pump arranged therein to communicate with the second air vent.

[0016] Furthermore, the sealing layer is coated on the lower end surface of the PCBA circuit board using circuit board glue, and the sealing layer is coated on at least the lower end surface of the PCBA circuit board around the second vent hole.

[0017] Furthermore, the micro air pressure regulating valve also includes a battery; the plane shape and size of the PCBA circuit board corresponds to the plane shape and size of the ventilation chamber and the power interface chamber, and the PCBA circuit board is provided with a pressure and temperature sensor, a power interface, a battery interface, a toggle switch, two air pump connection pads and other electronic components, wherein the power interface is arranged at the right rear of the PCBA circuit board, the battery interface and the toggle switch are both arranged on the upper end surface of the PCBA circuit board and located at the front, the two air pump connection pads are arranged at corresponding positions on the lower end surface of the PCBA circuit board, and the pressure and temperature sensor is arranged on the lower end surface of the PCBA circuit board and located at the rear middle; the second vent is located at the front middle of the PCBA circuit board;

[0018] The battery is arranged in the battery chamber of the lower shell, and the battery is electrically connected to the PCBA circuit board;

[0019] A notch for installing the power interface is provided on the right peripheral wall of the lower shell at the power interface chamber; a switch toggle key is provided on the front peripheral wall of the lower shell at the ventilation chamber;

[0020] The air pump is also provided with two electrical connection pads arranged on the left and right sides of the front side and a gas relief portion provided with a gas relief hole in the center of the front side;

[0021] The air pump is welded to the corresponding air pump connection pads of the PCBA circuit board by its two welding pads; the PCBA circuit board is sealed above the ventilation chamber and the power interface chamber of the lower shell, and the PCBA circuit board is airtightly connected to the surrounding wall of the ventilation chamber, and the pressure and temperature sensors are located between the air pump and the ventilation seat; and the only battery interface with a risk of leakage is arranged in the power interface chamber of the lower shell; the switch toggle key is plug-connected to the toggle switch.

[0022] Furthermore, the micro air pressure regulating valve also includes an upper shell; a circle of first mounting grooves opening upward is provided between the first supporting portion and the peripheral wall of the lower shell; the upper shell is a shell body arranged corresponding to the lower shell, and is in a square shape with an opening downward, and a circle of first tenons corresponding to the first mounting groove is provided on the inner side of the peripheral wall of the upper shell, and a third partition is provided on the right side of the position directly opposite to the first partition of the lower shell, and the third partition is provided with a battery wire notch, a lower pressure plate for upper and lower limit circuit boards is provided at the front right corner, and a tubular ventilation seat opening downward and located above the corresponding position of the sealing cavity is provided in the rear middle part, and the upper shell plate in the ventilation seat is provided with a waist-shaped indicator light hole passing through from top to bottom; the upper shell is also provided with a notch for installing a power interface and a toggle switch notch at the corresponding position of the lower shell; the upper shell is installed on the lower shell from above, and glue is injected into the first mounting groove of the lower shell, and the upper shell is inserted into the first mounting groove of the lower shell from above by its first tenon to limit circumferentially and be fixed up and down after the glue is cured, and the third partition and the lower pressure plate limit the upward movement of the PCBA circuit board;

[0023] A second support portion having the same height as the second partition is provided on the inner side of the peripheral wall of the ventilation chamber, and a second sealing groove with an opening facing upward is provided between the second support portion and the peripheral wall of the ventilation chamber; by injecting PCB waterproof sealant into the second sealing groove of the lower shell, and then sealing and adhering the PCBA circuit board from the lower end surface to the top of the ventilation chamber and the power interface chamber, the ventilation chamber is covered and sealed by the PCBA circuit board to form a sealed cavity, and there is a gap between the breathable membrane and the PCBA circuit board.

[0024] Furthermore, the micro air pressure regulating valve also includes a face sticker; the upper end surface of the upper shell is provided with an annular flange that is high inside and gradually low outside to form a circular face sticker groove that opens upward, and the indicator hole is located in the center of the face sticker groove; an easy-to-tear convex portion is provided at any position of the peripheral wall of the face sticker groove; the shape of the face sticker corresponds to the face sticker groove and a transparent portion is provided at the indicator hole, and the face sticker is adhered to the face sticker groove. The upper end surface of the PCBA circuit board is also provided with a working status indicator light, and the indicator hole is located above the working status indicator light of the PCBA circuit board.

[0025] Furthermore, the micro air pressure regulating valve also includes a rubber sleeve; the vent seat opens downward so that the lower end surface of the lower shell is provided with an annular embedding groove opening downward around the connecting head; the rubber sleeve is open upward, and its peripheral wall shape corresponds to the peripheral wall of the shell body, the bottom surface of the rubber sleeve is larger than the shell body, and a connecting seat is provided in the rubber sleeve at a position corresponding to the embedding groove, and a connecting head sleeve hole is provided in the center of the connecting seat through the upper and lower parts, and the inner wall of the connecting head sleeve hole is provided with evenly spaced annular sealing ribs, and the rubber sleeve is tightly fitted on the shell body from the bottom due to its characteristics, and the switch toggle key and the power interface are exposed, and the connecting seat is inserted into the embedding groove and the connecting head is tightly wrapped by the connecting head sleeve hole.

[0026] Furthermore, the micro air pressure regulating valve also includes a connecting buckle and a breathable membrane; the vent seat opens downward so that the lower end surface of the lower shell is provided with an annular embedding groove opening downward around the connecting head; an internal thread is provided in the embedding groove, and the lower end surface of the lower shell is symmetrically provided with oval-shaped limiting grooves on the left and right sides of the embedding groove; the connecting buckle includes a base plate and a columnar nesting seat connected to the upper center of the base plate, the base plate and the nesting seat are provided with a third vent hole passing through from top to bottom, a connecting head mounting groove for being sleeved on the connecting head is provided at the upper opening of the nesting seat, an annular closing cover plate is provided at the bottom of the nesting seat and the connection between the base plate, a quarter-turn external thread portion corresponding to the internal thread of the embedding groove is provided on the left and right sides of the outer wall of the nesting seat, and the base plate is provided with raised limiting tenons corresponding to the limiting grooves on both sides of the nesting seat;

[0027] The external threaded part of the connecting buckle is screwed into the embedding groove of the lower shell by rotating 90 degrees, and the limiting tenon is inserted into the corresponding limiting groove of the lower shell to connect the connecting buckle and the lower shell together. At the same time, the connecting head installation groove of the connecting buckle is sleeved on the connecting head, and the closing cover plate is inserted into the embedding groove for sealing. A sealing rubber ring is arranged on the outer periphery of the connecting head and the bottom of the embedding groove for further sealing; the two can be separated by rotating the connecting buckle or the lower shell 90 degrees in the opposite direction;

[0028] The breathable film is adhered to the lower end surface of the connecting buckle to cover the third breathable hole, and the third breathable hole is located in the center of the breathable film.

[0029] Furthermore, the power interface adopts a Type-C interface, a DC interface or a magnetic charging interface or a wireless charging coil is set in the upper shell;

[0030] The shell is made of ABS or PC material, the thickness of the pad is 0.1 to 0.3mm; the breathable membrane is made of ePTFE material; the battery is a lithium battery, with buffer foam glued on the top and bottom, and the battery is connected to the PCBA circuit board through a 3pin interface; the surface sticker is made of PVC or PET material; the rubber sleeve is made of silicone rubber material. Another breathable membrane is glued to the outside of the connection seat on the lower end of the rubber sleeve.

[0031] Furthermore, the air inlet of the air pump is located on the lower end surface, and the air outlet is located on the upper end surface. A one-way valve is provided in the air outlet of the air pump so that air can only be discharged but not taken in. There are three air inlet holes, which are distributed in the center of the lower end surface in an equilateral triangle shape; the air outlet of the air pump is directly opposite to the second air vent, and the air pump is assisted by a sealing layer to be fixed on the PCBA circuit board and the sealing layer is used to air-seal the air outlet and the second air vent; the second air hole is the air outlet of the sealed cavity; and the first air hole is the air inlet of the sealed cavity.

[0032] Furthermore, the PCBA circuit board is provided with a Bluetooth, WIFI or NFC wireless connection module, which can observe the pressure and temperature values ​​of the sealing chamber in real time and adjust the corresponding critical values ​​after connecting through the corresponding APP; the PCBA circuit board is provided with a working status indicator light, and the upper shell is made of semi-transparent material.

[0033] The present invention has positive effects: (1) The miniature air pressure regulating valve of the present invention is small in size, with an overall size of only 4cm*4cm*7mm, which is ultra-miniature, easier to carry, and easier to operate and use.

[0034] (2) The micro air pressure regulating valve of the present invention uses a micro piezoelectric pump to reduce the noise level during operation to less than 5 decibels, which causes almost no noise pollution and electromagnetic pollution to the human body. At the same time, the working power consumption of the pump body is about 600 milliwatts, making the working power consumption of the device very small.

[0035] (3) The micro air pressure regulating valve of the present invention solves the problem of air tightness of the instrument by coordinating the sealing cavity design of the air pump, and the sealing cavity is formed by the PCBA circuit board and the ventilation chamber of the lower shell, or a sealed cavity is designed separately in the lower shell, or the air pump and the ventilation chamber of the lower shell form a sealed cavity. There is no need to connect the pipeline to the side to be connected, and at the same time solves the problem of increased power consumption of the equipment due to leakage.

[0036] (4) The micro air pressure regulating valve and the vent hole of the present invention are provided with a waterproof and breathable mold to prevent dust, liquid, bacteria and other microorganisms from being sucked into the device when the device is operated under pressure or negative pressure, thereby damaging the operation of the precision instruments in the device.

[0037] (5) The micro air pressure regulating valve of the present invention uses a perforated PCBA circuit board as the upper edge of the sealed cavity, and affixes a ring-shaped sealing double-sided sticker, soft glue or coated circuit board glue at the ventilation position between the air pump and the PCB circuit board, so that a seal is formed between the PCBA circuit board and the air channel of the air pump. The lower shell is used as the lower edge of the sealed cavity and a vent is left, and the pressure sensor is placed in the sealed cavity. This design can minimize the volume.

[0038] (6) The micro air pressure regulating valve of the present invention is equipped with pressure and temperature sensors on the PCBA circuit board, so that when the device is working, it can monitor the pressure value and temperature value in the cavity in real time, and can judge the pressure state as the pressure in the sealed cavity increases or decreases. When the pressure increases or decreases to a certain critical value, the air pump starts working, and when the pressure increases to a certain critical value, the pump body stops working, thereby reducing the working time and working energy consumption of the pump body; when the temperature in the sealed cavity increases or decreases, when the external temperature rises, the blood vessels expand, resulting in an increase in blood perfusion, and the pressure value can be appropriately reduced. When the external temperature decreases, the blood vessels contract, resulting in a decrease in blood perfusion, and the pressure value can be appropriately increased.

[0039] (7) A columnar ventilation seat is provided above the rear inner bottom plate of the ventilation chamber, and the ventilation seat is provided with a columnar connecting head that passes downward through the lower shell bottom plate and exposes the head. A first ventilation hole is provided in the center of the ventilation seat, and an annular ventilation expansion groove is provided around the first ventilation hole on the upper end surface of the ventilation seat, and a trumpet-shaped transition with a larger top and a smaller bottom is adopted between the ventilation expansion groove and the first ventilation hole; the ventilation seat has a disc-shaped breathable membrane groove by providing a peripheral wall, so that the bottom surface of the breathable membrane groove and the bottom surface of the ventilation expansion groove are in a stepped shape with a high outside and a low inside; the peripheral wall of the upper end surface of the ventilation seat is provided with three inverted trapezoidal expansion grooves with uniform intervals, so that the entire device and the air channel on the side to be connected can be conveniently connected while maintaining air tightness, and the air channel can ventilate smoothly.

[0040] (8) The surface sticker is made of PVC or PET material. The shape of the surface sticker corresponds to the surface sticker groove. The surface sticker is pasted in the surface sticker groove. Due to the provision of the easy-to-tear convex portion, the surface sticker is easy to replace. The surface sticker not only plays a protective and dustproof role, but also has a more beautiful appearance.

[0041] (9) The rubber sleeve is made of silicone rubber material. A connecting head sleeve hole is provided in the center of the connecting seat of the rubber sleeve, which passes through the connecting head sleeve hole from top to bottom. The inner wall of the connecting head sleeve hole is provided with evenly spaced annular sealing ribs. The rubber sleeve is tightly fitted on the shell from below due to its characteristics, and the connecting seat is inserted into the embedding groove and the connecting head is tightly wrapped by the connecting head sleeve hole. The rubber sleeve can fix the equipment while connecting to the outside world.

[0042] (10) The micro air pressure regulating valve also includes a connecting buckle. The external threaded portion of the connecting buckle is screwed into the embedding groove of the lower shell by rotating 90 degrees, and the limiting tenon is inserted into the corresponding limiting groove of the lower shell to connect the connecting buckle and the lower shell together. At the same time, the connecting head installation groove of the connecting buckle is sleeved on the connecting head, and the closed cover plate is inserted into the embedding groove for sealing. A sealing rubber ring is set on the outer periphery of the connecting head and the bottom of the embedding groove for further sealing; the two can be separated by rotating the connecting buckle or the lower shell 90 degrees in the opposite direction; the breathable membrane is adhered to the lower end surface of the connecting buckle to block the third vent hole, and the third vent hole is located in the center of the breathable membrane. This ensures that the device is prevented from sucking dust, liquid, bacteria and other microorganisms into the device during pressurization or negative pressure operation, and the device can be easily installed in the use scene or disassembled through the connecting buckle.

[0043] (11) The air pump is provided with a one-way valve, which greatly reduces the power consumption of the equipment while reducing its size.

[0044] (12) The micro air pressure regulating valve device of the present invention adopts a toggle-type physical switch, which can completely cut off the circuit when shutting down to prevent standby power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 A structural schematic diagram (front view) of the micro air pressure regulating valve of the present invention;

[0046] Figure 2 for Figure 1 A top view of

[0047] Figure 3 for Figure 2 AA surface section view;

[0048] Figure 4 for Figure 1 Isometric stereogram of

[0049] Figure 5 for Figure 2 Schematic diagram of the lower shell in;

[0050] Figure 6 for Figure 4 The schematic diagram of the micro air pressure regulating valve shown is shown with the upper shell, surface sticker and rubber sleeve removed;

[0051] Figure 7 for Figure 4 An exploded schematic diagram of a micro gas pressure regulating valve is shown;

[0052] Figure 8 for Figure 7 A schematic diagram of a reverse explosion of a micro gas pressure regulating valve is shown;

[0053] Fig. 9A three-dimensional schematic diagram of another micro air pressure regulating valve of the present invention;

[0054] Fig.10 for Fig. 9 An exploded schematic diagram of a micro gas pressure regulating valve is shown;

[0055] Fig.11 for Fig. 9 Another three-dimensional schematic diagram of the micro air pressure regulating valve shown;

[0056] Fig.12 for Fig.11 An exploded schematic diagram of a miniature gas pressure regulating valve is shown.

[0057] The marks in the above drawings are as follows: lower shell 1, battery chamber 11, ventilation chamber 12, power interface chamber 13, first support portion 14, first mounting groove T1, second partition 15, second support portion 16, second sealing groove T2, ventilation seat 17, connector 17-1, first vent hole 17-2, ventilation expansion groove T3, breathable membrane groove T4, expansion groove T5, embedded groove T6, pad 18, switch toggle key 19,

[0058] Breathable membrane 2, air pump 3, air inlet 31, air outlet 32, welding pad 33, air leakage part 34, sealing layer 4,

[0059] PCBA circuit board 5, pressure and temperature sensor 51, power interface 52, battery interface 53, toggle switch 54, second vent hole 55,

[0060] Battery 6, upper shell 7, first tenon 71, lower pressure plate 72, ventilation seat 73, indicator light hole 74, surface sticker groove 75, easy-tear convex part 76, surface sticker 8, rubber sleeve 9, connecting seat 91, connecting buckle 100, nesting seat 100-1, sealing rubber ring 100-2. DETAILED DESCRIPTION

[0061] The technical solutions in the embodiments of the present application will be clearly described below in conjunction with the drawings of the specification of the present application. It should be noted that the terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated before and after are in an "or" relationship.

[0062] It should be noted that, in the description of the present application, the orientation or positional relationship indicated by terms such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the orientation or positional relationship shown in the accompanying drawings, and the main view is used as the reference positional relationship. They are only for the convenience of describing the present application and simplifying the description. Unless otherwise stated, these orientation words do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application; the orientation words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0063] Example 1

[0064] See Figures 1 to 8 The micro air pressure regulating valve of this embodiment includes a lower shell 1, a breathable membrane 2, an air pump 3, a sealing layer 4, a PCBA circuit board 5, a battery 6, an upper shell 7, a surface sticker 8 and a rubber sleeve 9.

[0065] See Figure 3 , Figure 5 , Figure 7 and Figure 8The lower shell 1 is square with an opening upward, and a circle of first support parts 14 is provided on the inner side of the peripheral wall of the lower shell 1, the first support parts 14 are higher than the peripheral wall of the lower shell 1, and a circle of first mounting grooves T1 with an opening upward is provided between the first support parts 14 and the peripheral wall; the space enclosed by the first support parts 14 and the bottom plate of the lower shell 1 is divided into two spaces opening upward by a first partition plate of the same height as the first support parts 14, wherein the space on the left side is the battery chamber 11, and the space on the right side is divided into a ventilation chamber 12 located in the middle right part of the lower shell 1 and a power interface chamber 13 located in the right rear part of the lower shell 1 by an L-shaped second partition plate 15 arranged on the right rear side and lower than the first support part 14, so that in this embodiment, the battery chamber 11 is square, the power interface chamber 13 is square, and the ventilation chamber 12 is L-shaped when viewed from above. A second support portion 16 having the same height as the second partition 15 is provided on the inner side of the peripheral wall of the ventilation chamber 12 (i.e., the corresponding first partition, second partition 15 and first support portion 14), and a second sealing groove T2 opening upward is provided between the second support portion 16 and the peripheral wall of the ventilation chamber 12. A columnar ventilation seat 17 is provided above the rear inner bottom plate of the ventilation chamber 12, and the ventilation seat 17 is provided with a columnar connector 17-1 that passes downward through the bottom plate of the lower shell 1 and exposes the head, and a first ventilation hole 17-2 that passes through the center of the ventilation seat 17 is provided, and an annular ventilation expansion groove T3 is provided around the first ventilation hole 17-2 on the upper end surface of the ventilation seat 17, and a trumpet-shaped transition with a larger top and a smaller bottom is adopted between the ventilation expansion groove T3 and the first ventilation hole 17-2 to obtain a better ventilation effect; the ventilation seat 17 is provided with a peripheral The wall has a disc-shaped breathable membrane groove T4, so that the bottom surface of the breathable membrane groove T4 and the bottom surface of the ventilation expansion groove T3 are stepped with the outside being high and the inside being low; the upper end surface peripheral wall of the vent seat 17 is provided with three inverted trapezoidal expansion grooves T5 evenly spaced to obtain a better ventilation effect; the vent seat 17 opens downward so that the lower end surface of the lower shell 1 is provided with a circular embedding groove T6 opening downward around the connector 17-1, and the embedding groove T6 is used for embedding and connecting with the connector 17-1 when the entire micro air pressure regulating valve is connected. A generally U-shaped pad 18 is provided above the left front, front and right front edges of the bottom plate of the ventilation chamber 12, and the thickness of the pad 18 is 0.2mm. The lower shell 1 is provided with a notch for installing the power interface on the right peripheral wall at the power interface chamber 13. The lower shell 1 is provided with a switch toggle key 19 on the front peripheral wall at the ventilation chamber 12. The lower shell 1 is made of ABS or PC material, and the lower shell 1 except the switch toggle key 19 is an injection-molded integral part.

[0066] The breathable membrane 2 is a disc-shaped membrane made of ePTFE material, and the size of the breathable membrane 2 corresponds to the size of the breathable membrane groove T4. The breathable membrane 2 is adhesively arranged in the breathable membrane groove T4 of the lower shell 1.

[0067] The air pump 3 adopts a micro piezoelectric pump, which is an air pump with piezoelectric ceramic as a driving element. It has a compact structure, is thin and light, works silently and has a high output pressure. In this embodiment, a micro piezoelectric pump of model MZB3005T06 manufactured by Murata Manufacturing Co., Ltd. is used. Compared with a conventional air pump, the air pump is small in size, thin in thickness and weighs only 3.5g. The air pump 3 is provided with an air inlet 31 located at the lower end surface, an air outlet 32 ​​located at the upper end surface and two electrical connection pads 33 arranged on the left and right sides of the front side surface. Further, the air pump 3 can also be provided with a venting portion 34 with an air venting hole located in the center of the front side surface. The size of the air pump 3 corresponds to the front middle part of the ventilation chamber 12 of the lower shell 1. A one-way valve is added in the air outlet 32 ​​of the air pump 3 so that only air can be discharged but not inlet. The number of the air inlet 31 is three, which are distributed in the center of the lower end surface in an equilateral triangle shape.

[0068] The plane shape and size of the PCBA circuit board 5 correspond to the plane shape and size of the ventilation chamber 12 and the power interface chamber 13. The PCBA circuit board 5 is provided with a pressure and temperature sensor 51, a power interface 52, a battery interface 53, a toggle switch 54, two air pump 3 connection pads and other electronic components, wherein the power interface 52 is arranged at the right rear of the PCBA circuit board 5. In this embodiment, the power interface 52 adopts a Type-C interface; the battery interface 53 and the toggle switch 54 are both arranged on the upper end surface of the PCBA circuit board 5 and located at the front, the two air pump 3 connection pads are arranged at the corresponding positions of the lower end surface of the PCBA circuit board 5, and the pressure and temperature sensor 51 is arranged on the lower end surface of the PCBA circuit board 5 and located at the rear middle. The PCBA circuit board 5 is also provided with a second vent hole 55, which is located in the front middle of the PCBA circuit board 5. The upper end surface of the PCBA circuit board 5 is also provided with a working status indicator light to indicate the working status of the entire micro air pressure regulating valve.

[0069] The sealing layer 4 is used for airtight sealing of the body of the PCBA circuit board 5. In this embodiment, a ring-shaped waterproof double-sided tape or soft adhesive is used. The sealing layer 4 is glued to the upper end surface of the air pump 3 and is arranged around the air outlet 32 ​​in the hollow of the sealing layer 4 to expose the air outlet 32.

[0070] See Figure 3 and Figures 6 to 8The air pump 3 is welded to the corresponding air pump 3 connection pads of the PCBA circuit board 5 by its two welding pads 33, and the air outlet 32 ​​of the air pump 3 is opposite to the second vent hole 55. The air pump 3 is fixed to the PCBA circuit board 5 with the assistance of the sealing layer 4 and is air-sealed around the air outlet 32 ​​and the second vent hole 55 by the sealing layer 4. The PCBA circuit board 5 is sealed and arranged above the ventilation chamber 12 and the power interface chamber 13 of the lower shell 1, and the PCBA circuit board 5 is air-sealed to the peripheral wall of the ventilation chamber 12. Specifically, by injecting PCB waterproof sealant into the second sealing groove T2 of the lower shell 1, and then sealingly adhering the PCBA circuit board 5 from the lower end face to the ventilation chamber 12 and the power interface chamber 13, the ventilation chamber 12 is covered and sealed by the PCBA circuit board 5 to form a sealed cavity, and there is a gap between the breathable membrane 2 and the PCBA circuit board 5, and the air pump 3 is located in the ventilation chamber 12. The air pump 3 is located in the front middle of the chamber 12 and above the U-shaped pad 18. The pad 18 supports the three left front middle edges of the lower end surface of the air pump 3 so that there is a ventilation gap between the lower end surface of the air pump 3 and the bottom plate of the ventilation chamber 12, which is equivalent to the thickness of the pad 18. The three air inlet holes 31 of the air pump 3 are located in the ventilation gap. The sealed cavity only has two air exchange channels, namely, the first air vent 17-2 of the lower shell 1 and the second air vent 55 of the PCBA circuit board 5 that is connected to the air outlet 32. The pressure and temperature sensor 51 is located between the air pump 3 and the ventilation seat 17. In addition, the only battery interface 53 with a risk of air leakage is set in the power interface chamber 13 of the lower shell 1; the switch toggle key 19 is plug-connected with the toggle switch 54.

[0071] The battery 6 is a lithium battery with buffer foam pasted on the upper and lower parts. The battery 6 is pasted in the battery chamber 11 of the lower shell 1 through the buffer foam. The battery 6 is electrically connected to the PCBA circuit board 5. In this embodiment, the battery 6 is electrically connected to the PCBA circuit board 5 using a 3pin interface.

[0072] The upper shell 7 is an injection-molded one-piece made of ABS or PC material. The upper shell 7 is a shell corresponding to the lower shell 1, and is in a square shape with an opening downward. The inner side of the peripheral wall of the upper shell 7 is provided with a circle of first tenons 71 corresponding to the first installation groove T1. A third partition is provided on the right side of the position directly opposite to the first partition of the lower shell 1, and the third partition is provided with a wire-passing notch for the battery 6. A lower pressure plate 72 for the upper and lower limit circuit board is provided at the front right corner. A tubular ventilation seat 73 with an opening downward and located above the corresponding position of the sealing cavity is provided in the middle of the rear. The upper shell plate inside the ventilation seat 73 is provided with a waist-shaped indicator light hole 74 that passes through from top to bottom. The upper shell 7 is also provided with a notch for installing the power interface and a toggle switch notch at the corresponding position of the lower shell 1. The upper end surface of the upper shell 7 is provided with an annular flange that is high inside and gradually low outside to form a circular surface mounting groove 75 with an opening upward, and the indicator light hole 74 is located in the center of the surface mounting groove. An easy-to-tear convex portion 76 is provided at any position of the peripheral wall of the surface sticker groove 75. In this embodiment, the easy-to-tear convex portion 76 is located at the rear and is semicircular. The surface sticker 8 is made of PVC or PET material. The shape of the surface sticker 8 corresponds to the surface sticker groove 75 and a transparent portion is provided at the indicator light hole 74. The surface sticker 8 is pasted in the surface sticker groove 75. Due to the provision of the easy-to-tear convex portion 76, the surface sticker 8 is easy to replace. The surface sticker 8 not only plays a protective role against dust, but also looks beautiful.

[0073] The upper shell 7 is installed on the lower shell 1 from above. Specifically, glue is injected into the first installation groove T1 of the lower shell 1, and the upper shell 7 is inserted into the first installation groove T1 of the lower shell 1 from above by its first tenon 71 to be limited circumferentially and fixed up and down after the glue is cured, so that the indicator hole 74 is located above the indicator light of the PCBA circuit board 5, and the third partition plate and the lower pressure plate 72 limit the upward movement of the PCBA circuit board 5.

[0074] The rubber sleeve 9 is made of silicone rubber material. The rubber sleeve 9 is open upward. The shape of its peripheral wall corresponds to the peripheral wall of the shell composed of the lower shell 1 and the upper shell 7. The bottom surface of the rubber sleeve 9 is larger than the shell. A connection seat 91 is provided in the rubber sleeve 9 at the corresponding position of the embedding groove T6. A connector sleeve hole is provided in the center of the connection seat 91, which runs through from top to bottom. The inner wall of the connector sleeve hole is provided with evenly spaced annular sealing ribs. The rubber sleeve 9 is tightly fitted on the shell from below due to its characteristics, and the switch toggle key 19 and the power interface 52 are exposed. The connection seat 91 is inserted into the embedding groove T6 and the connector sleeve hole is tightly fitted to wrap the connector 17-1. Moreover, more preferably, the rubber sleeve 9 is also adhered with a breathable membrane 2 outside the connection seat 91 on its lower end surface to prevent liquids or microorganisms such as bacteria from passing through.

[0075] The micro air pressure regulating valve of this embodiment is used to implement negative pressure control when in use. It is inserted through the connector 17-1 of the lower shell 1 with a tight fit or is tightly sleeved on the corresponding connector on the side to be connected through the first vent hole 17-2 in the connector 17-1 with a tight fit. Since the air pump 3 used in the micro air pressure regulating valve of this embodiment is a micro piezoelectric pump, the overall weight of this product is very small, and it can be directly connected to the ultra-close connector on the side to be connected without pipelines; it can be directly powered by the power interface 52 or disconnected from the power connection line after charging the battery 6. After turning on the device by turning on the toggle switch toggle key 19, the pressure and temperature sensor 51 on the PCBA circuit board 5 can monitor the pressure value and temperature value in the sealed cavity in real time. As the pressure in the sealed cavity increases or decreases, it is determined whether it is in a negative pressure state. When the pressure decreases to a certain set critical value, the air pump 3 starts to work, and when the pressure increases to a certain set critical value, the air pump 3 stops working, thereby reducing the working time and working energy consumption of the air pump 3; when the air pump 3 is working, the air pump 3 uses the inverse piezoelectric effect of the piezoelectric ceramic to deform the piezoelectric vibrator , and then the volume change of the pump chamber is generated by deformation to realize exhaust of the side to be connected to reduce the pressure. Specifically, the gas on the side to be connected passes through the first vent hole 17-2 to the ventilation expansion groove T3 and then passes through the breathable membrane 2. At the same time, the breathable membrane 2 has a barrier property to prevent liquids or microorganisms such as bacteria from passing through. After passing through the breathable membrane 2 and the expansion groove T5, it is convenient to enter the sealed cavity. The three air inlet holes 31 of the air pump 3 continuously pass the gas in the sealed cavity through the air outlet hole 32 and the second air vent 55 from the ventilation gap into the upper shell 7, and discharge it through the power interface 52 and the toggle switch 54. When the micro air pressure regulating valve of this embodiment is used in scenes such as medical treatment, the pressure and temperature sensor 51 can detect the increase or decrease of the temperature in the sealed cavity. When the external temperature rises, the blood vessels of the human body expand, resulting in an increase in blood perfusion, and the negative pressure value can be appropriately reduced. When the external temperature decreases, the blood vessels contract, resulting in a decrease in blood perfusion, and the negative pressure value can be appropriately increased.

[0076] Example 2

[0077] The micro air pressure regulating valve of this embodiment is basically the same as that of embodiment 1, except that: Figures 9 to 11 , does not include the rubber sleeve 9, but also includes a connecting buckle 100, and the following:

[0078] The lower shell 1 is square with an opening upward, and a circle of first support parts 14 is provided on the inner side of the peripheral wall of the lower shell 1, the first support parts 14 are higher than the peripheral wall of the lower shell 1, and a circle of first mounting grooves T1 with an opening upward is provided between the first support parts 14 and the peripheral wall; the space enclosed by the first support parts 14 and the bottom plate of the lower shell 1 is divided into two spaces opening upward by a first partition plate of the same height as the first support parts 14, wherein the space on the left is the battery chamber 11, and the space on the right is divided into a ventilation chamber 12 located in the middle right part of the lower shell 1 and a power interface chamber 13 located in the right rear part of the lower shell 1 by an L-shaped second partition plate 15 arranged on the right rear side and lower than the first support part 14, so that in this embodiment, the battery chamber 11 is square, the power interface chamber 13 is square, and the ventilation chamber 12 is L-shaped when viewed from above. A second support portion 16 having the same height as the second partition plate 15 is provided on the inner side of the peripheral wall of the ventilation chamber 12 (i.e. the corresponding first partition plate, second partition plate 15 and first support portion 14 ), and a second sealing groove T2 opening upward is provided between the second support portion 16 and the peripheral wall of the ventilation chamber 12 . A columnar ventilation seat 17 is provided above the rear inner bottom plate of the ventilation chamber 12, and the ventilation seat 17 is connected to the corresponding inner wall of the ventilation chamber 12 by its rear and left parts. The ventilation seat 17 is provided with a columnar connecting head 17-1 that passes downward through the bottom plate of the lower shell 1 and exposes the head. A first ventilation hole 17-2 that passes through from top to bottom is provided in the center of the ventilation seat 17. An upwardly protruding step portion is provided around the first ventilation hole 17-2 on the upper end surface of the ventilation seat 17 to form an annular ventilation expansion groove T3 and a square expansion groove T5 extending from the ventilation expansion groove T3 to the front and right thereof. A trumpet-shaped transition with a larger top and a smaller bottom is adopted between the ventilation expansion groove T3 and the first ventilation hole 17-2 to obtain a better ventilation effect; the ventilation seat 17 opens downward so that the lower end surface of the lower shell 1 is provided with an annular embedding groove T6 that opens downward around the connecting head 17-1. The embedding groove T6 is used for embedding and connecting with the connecting head 17-1 when the entire micro air pressure regulating valve is connected. An internal thread is provided in the embedding groove T6, and the lower end surface of the lower shell 1 is symmetrically provided with oval-shaped limit grooves on the left and right sides of the embedding groove T6. A U-shaped pad 18 is provided above the left front, front and right front edges of the bottom plate of the ventilation chamber 12, and the thickness of the pad 18 is 0.2mm. A notch for installing the power interface is provided on the right peripheral wall of the lower shell 1 at the power interface chamber 13. A switch toggle key 19 is provided on the front peripheral wall of the lower shell 1 at the ventilation chamber 12. The lower shell 1 is made of ABS or PC material, and the lower shell 1 except the switch toggle key 19 is an injection-molded integral part.

[0079] The connecting buckle 100 includes a base plate and a columnar nesting seat 100-1 connected to the upper center of the base plate. The base plate and the nesting seat 100-1 are provided with a third ventilation hole that passes through from top to bottom. The upper opening of the nesting seat 100-1 is provided with a connector mounting groove for being sleeved on the connector 17-1. The bottom of the nesting seat 100-1 is connected to the base plate at a ring-shaped closed cover. The outer wall of the nesting seat 100-1 is provided with a quarter-turn external thread portion corresponding to the internal thread of the embedding groove T6 on both sides of the base plate. The base plate is provided with raised limit tenons corresponding to the limit grooves on both sides of the nesting seat 100-1.

[0080] The external threaded portion of the connecting buckle 100 through its nesting seat 100-1 is rotated 90 degrees and screwed into the embedding groove T6 of the lower shell 1. At the same time, the limiting tenon is inserted into the corresponding limiting groove of the lower shell 1 to connect the connecting buckle 100 and the lower shell 1 together. At the same time, the connecting head installation groove of the connecting buckle 100 is sleeved on the connecting head 17-1, and the closing cover plate is inserted into the embedding groove T6 for sealing. Furthermore, a sealing rubber ring 100-2 can be set on the outer periphery of the connecting head 17-1 and the bottom of the embedding groove T6 for further sealing. The two can be separated by rotating the connecting buckle 100 or the lower shell 1 in the opposite direction by 90 degrees.

[0081] The breathable membrane 2 is a disc-shaped membrane made of ePTFE material. The breathable membrane 2 is adhered to the lower end surface of the connecting buckle 100 to cover the third ventilation hole, and the third ventilation hole is located in the center of the breathable membrane 2.

[0082] Example 3

[0083] The micro air pressure regulating valve of this embodiment is basically the same as that of Embodiments 1 and 2, except that the air inlet 31 and the air outlet 32 ​​of the air pump 3 are interchanged, such as rotating the air pump 3 in Embodiment 1 by 180° and interchanging the bottom surfaces, and adjusting the electrical connection properties of the corresponding pads, so that the micro air pressure regulating valve of this embodiment is used to implement boost control.

[0084] Example 4

[0085] The micro air pressure regulating valve of this embodiment is basically the same as that of Embodiments 1 and 2, except that: the air outlet 32 ​​of the air pump 3 is not provided with a one-way valve, and the air pump 3 can implement positive and negative bidirectional air extraction or air intake, and implement three control modes of exhausting to negative pressure, closing, and intake to boost pressure by toggling the switch 54.

[0086] Example 5

[0087] The micro air pressure regulating valve of this embodiment is basically the same as that of Embodiments 1 and 2, except that: the sealing layer 4 is directly coated with the lower end surface of the PCBA circuit board 5 using circuit board glue to obtain a sealing effect, and the sealing layer 4 is at least coated on the lower end surface of the PCBA circuit board 5 around the second vent hole 55. Further, the sealing layer 4 completely coats the lower end surface of the PCBA circuit board 5. Furthermore, the sealing layer 4 coats the upper and lower end surfaces of the PCBA circuit board 5 to obtain a better sealing effect.

[0088] Example 6

[0089] The micro air pressure regulating valve of this embodiment is basically the same as that of embodiments 1 to 5, except that the housing composed of the lower housing 1 and the upper housing 7 is generally circular.

[0090] Example 7

[0091] The micro air pressure regulating valve of this embodiment is basically the same as that of embodiments 1 to 6, except that a sealing ring is arranged in the second sealing groove T2 of the lower shell 1, the PCBA circuit board 5 and the lower shell 1 are sealed by the sealing ring, and the PCBA circuit board 5 is sealed by pressing the sealing ring down by the pressing member in the upper shell 7.

[0092] Example 8

[0093] The micro air pressure regulating valve of this embodiment is basically the same as that of embodiments 1 to 7, except that the power interface 52 adopts a DC interface or a magnetic charging interface or a wireless charging coil is arranged in the upper shell 7 .

[0094] Example 9

[0095] The micro air pressure regulating valve of this embodiment is basically the same as embodiments 1 to 8, except that: a wireless connection module such as Bluetooth, WIFI, NFC, etc. is provided on the PCBA circuit board 5, and the pressure value and temperature value of the sealing cavity can be observed in real time after being connected through the corresponding APP, and the corresponding critical value can be adjusted.

[0096] Example 10

[0097] The micro air pressure regulating valve of this embodiment is basically the same as that of embodiments 1 to 9, except that the upper shell 7 is made of a semi-transparent material to more intuitively display the indication status of the working status indicator light on the PCBA circuit board 5.

[0098] Application Example 1

[0099] When the micro air pressure regulating valve of the above-mentioned embodiments 1-10 is applied to the medical field, such as the field of negative pressure dressing wound healing, by connecting the connector 17-1 to the dressing pipeline, the gas on the connected side passes through the first vent hole 17-2 to the ventilation expansion groove T3, and the breathable membrane 2 has a barrier property to prevent liquids or microorganisms such as bacteria from passing through, and conveniently enters the sealed cavity through the expansion groove T5. The three air inlet holes 31 of the air pump 3 continuously let the gas in the sealed cavity enter the upper shell 7 through the air outlet hole 32 and the second air vent 55 from the ventilation gap, and discharge it through the power interface 52 and the toggle switch 54; the pressure and temperature sensor 51 can detect the temperature increase or decrease in the sealed cavity. When the external temperature rises, the human body's blood vessels expand, resulting in an increase in blood perfusion, which can appropriately reduce the negative pressure value. When the external temperature decreases, the blood vessels contract, resulting in a decrease in blood perfusion, which can appropriately increase the negative pressure value.

[0100] Obviously, the above embodiments are merely examples for clearly explaining the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. However, these obvious changes or modifications derived from the spirit of the present invention are still within the scope of protection of the present invention.

Claims

1. A miniature air pressure regulating valve, characterized in that: It comprises a housing and an air pump (3) arranged in the housing; a sealed cavity is arranged in the housing, and the sealed cavity is provided with an air inlet and an air outlet; the air pump (3) adopts a micro piezoelectric pump, the air inlet of the air pump (3) is in gas communication with the air inlet of the sealed cavity, and the air outlet of the air pump (3) is in gas communication with the air outlet of the sealed cavity; The micro air pressure regulating valve further comprises a PCBA circuit board (5); the PCBA circuit board (5) is electrically connected to the air pump (3); the housing comprises a lower shell (1); the lower shell (1) is provided with a ventilation chamber (12) with an opening facing upward; the PCBA circuit board (5) is sealingly arranged on the ventilation chamber (12) to cover the ventilation chamber (12) to form a sealed cavity; The air pump (3) is arranged in the sealed cavity, and the air pump (3) separates the sealed cavity into an air inlet cavity and an air outlet cavity; The micro air pressure regulating valve further comprises a sealing layer (4); a generally U-shaped backing plate (18) is provided above the left front, front and right front edges of the bottom plate of the ventilation chamber (12); the air pump (3) is provided with an air inlet (31) and an air outlet (32) respectively located on the upper and lower end surfaces; the lower shell (1) is provided with a first air vent (17-2); the PCBA circuit board (5) is provided with a second air vent (55); the air pump (3) is electrically connected to the PCBA circuit board (5), and the air outlet (32) or the air inlet (31) of the air pump (3) is directly opposite to the second air vent (55); the air pump (3) is assisted by the sealing layer (4) to be fixed to the PCBA circuit board (5), and the sealing layer (4) at least surrounds the second air vent (55); 5) surrounding air sealing; the PCBA circuit board (5) is sealed and arranged above the ventilation chamber (12) of the lower shell (1), and the PCBA circuit board (5) is air-tightly connected to the peripheral wall of the ventilation chamber (12); and the air pump (3) is located in the front middle part of the ventilation chamber (12) and above the U-shaped pad (18), and the pad (18) supports the left front and middle three edge parts of the lower end surface of the air pump (3) so that there is a ventilation gap equivalent to the thickness of the pad (18) between the lower end surface of the air pump (3) and the bottom plate of the ventilation chamber (12), and relative to the second ventilation hole (55), the air inlet hole (31) or the air outlet hole (32) of the air pump (3) is air-through with the first ventilation hole (17-2).

2. The micro air pressure regulating valve according to claim 1, characterized in that: A ventilation seat (17) is provided above the rear inner bottom plate of the ventilation chamber (12); a columnar connector (17-1) is provided in the center of the ventilation seat (17); a first ventilation hole (17-2) extending vertically is provided in the center of the ventilation seat (17); an annular ventilation expansion groove (T3) is provided around the first ventilation hole (17-2) on the upper end surface of the ventilation seat (17); a trumpet-shaped transition with a larger top and a smaller bottom is adopted between the ventilation expansion groove (T3) and the first ventilation hole (17-2).

3. The micro air pressure regulating valve according to claim 2, characterized in that: It also includes a breathable membrane (2); the breathable membrane (2) is disc-shaped; the vent seat (17) is columnar and downwardly open; the vent seat (17) is provided with a peripheral wall and has a disc-shaped breathable membrane groove (T4), so that the bottom surface of the breathable membrane groove (T4) and the bottom surface of the ventilation expansion groove (T3) are in a stepped shape with a high outside and a low inside; the upper end surface peripheral wall of the vent seat (17) is provided with three inverted trapezoidal expansion grooves (T5) at even intervals; The size of the breathable membrane (2) corresponds to the size of the breathable membrane groove (T4); the breathable membrane (2) is adhesively arranged in the breathable membrane groove (T4) of the lower shell (1).

4. The micro air pressure regulating valve according to claim 2, characterized in that: The vent seat (17) is connected to the corresponding inner wall of the vent chamber (12) at its rear and left parts. The upper end surface of the vent seat (17) is provided with an upwardly protruding step portion around the first vent hole (17-2) to form an annular vent expansion groove (T3) and a square vent expansion groove (T5) extending from the vent expansion groove (T3) to the front and right thereof.

5. The micro air pressure regulating valve according to claim 2, characterized in that: The lower shell (1) is in a square shape with an opening upward. A circle of first support parts (14) is provided on the inner side of the peripheral wall of the lower shell (1). The first support parts (14) are higher than the peripheral wall of the lower shell (1). The lower shell (1) is divided into two spaces with an opening upward by a first partition plate of the same height as the first support part (14). The space on the left side is a battery chamber (11). The space on the right side is divided into a ventilation chamber (12) located in the middle right part of the lower shell (1) and a power interface chamber (13) located in the right rear part of the lower shell (1) by an L-shaped second partition plate (15) provided on the right rear side. The second partition plate (15) is lower than the first support part (14). Thus, the battery chamber (11) is in a square shape, the power interface chamber (13) is in a square shape, and the ventilation chamber (12) is in an L-shape when viewed from above.

6. The micro air pressure regulating valve according to claim 1, characterized in that: The sealing layer (4) is made of an annular waterproof double-sided tape or soft glue; the sealing layer (4) is adhesively arranged between the upper end surface of the air pump (3) and the lower end surface of the PCBA circuit board (5), and the air outlet hole (32) or the air inlet hole (31) of the air pump (3) correspondingly arranged therein is surrounded by the hollow interior of the sealing layer (4) to communicate with the second air vent (55).

7. The micro air pressure regulating valve according to claim 1, characterized in that: The sealing layer (4) is coated with a circuit board glue on the lower end surface of the PCBA circuit board (5), and the sealing layer (4) is coated on at least the lower end surface of the PCBA circuit board (5) around the second vent hole (55).

8. The micro air pressure regulating valve according to claim 5, characterized in that: It also includes a battery (6); the plane shape and size of the PCBA circuit board (5) corresponds to the plane shape and size of the ventilation chamber (12) and the power interface chamber (13); the PCBA circuit board (5) is provided with a pressure and temperature sensor (51), a power interface (52), a battery interface (53), a toggle switch (54), two air pump (3) connection pads and other electronic components, wherein the power interface (52) is arranged at the right rear part of the PCBA circuit board (5); the battery interface (53) and the toggle switch (54) are both arranged at the upper end surface of the PCBA circuit board (5) and located at the front part; the two air pump (3) connection pads are arranged at corresponding positions of the lower end surface of the PCBA circuit board (5); the pressure and temperature sensor (51) is arranged at the lower end surface of the PCBA circuit board (5) and located at the rear middle part; and the second ventilation hole (55) is located at the front middle part of the PCBA circuit board (5); The battery (6) is disposed in the battery chamber (11) of the lower shell (1), and the battery (6) is electrically connected to the PCBA circuit board (5); A notch for installing a power interface is provided on the right side peripheral wall of the lower shell (1) at the power interface chamber (13); a switch toggle key (19) is provided on the front side peripheral wall of the lower shell (1) at the ventilation chamber (12); The air pump (3) is further provided with two electrical connection pads (33) arranged on the left and right sides of the front side surface, and a gas relief portion (34) provided with a gas relief hole at the center of the front side surface; The air pump (3) is connected to corresponding air pump (3) connection pads of the PCBA circuit board (5) by welding through its two welding pads (33); the PCBA circuit board (5) is sealed and arranged above the ventilation chamber (12) and the power interface chamber (13) of the lower shell (1), and the PCBA circuit board (5) is airtightly connected to the peripheral wall of the ventilation chamber (12); the pressure and temperature sensor (51) is located between the air pump (3) and the ventilation seat (17); and the only battery interface (53) with a risk of air leakage is arranged in the power interface chamber (13) of the lower shell (1); the switch toggle key (19) is plug-connected to the toggle switch (54).

9. The micro air pressure regulating valve according to claim 8, characterized in that: The invention also comprises an upper shell (7); a circle of first mounting grooves (T1) with an opening facing upward is provided between the first supporting portion (14) of the lower shell (1) and the peripheral wall; the upper shell (7) is a shell body arranged corresponding to the lower shell (1), and is in a square shape with an opening facing downward; a circle of first tenons (71) corresponding to the first mounting grooves (T1) is provided on the inner side of the peripheral wall of the upper shell (7); a third partition is provided on the right side of the position directly opposite to the first partition of the lower shell (1), and the third partition is provided with a wire-passing notch for the battery (6); a lower pressure plate (72) for limiting the upper and lower positions of the circuit board is provided at the front right corner; and a lower pressure plate (72) with an opening facing downward and located at a corresponding position of the sealing cavity is provided at the rear middle part. The upper tubular ventilation seat (73) is provided with an oval-shaped indicator light hole (74) extending vertically in the upper shell plate of the ventilation seat (73); the upper shell (7) is also provided with a notch for installing a power interface and a toggle switch notch at a position corresponding to the lower shell (1); the upper shell (7) is installed on the lower shell (1) from above, and glue is injected into the first installation groove (T1) of the lower shell (1). The upper shell (7) is inserted from above into the first installation groove (T1) of the lower shell (1) through its first tenon portion (71) to limit the circumferential position and is fixed vertically after the glue is cured. The third partition plate and the lower pressure plate (72) limit the upward movement of the PCBA circuit board (5); A second support portion (16) having the same height as the second partition plate (15) is provided on the inner side of the peripheral wall of the ventilation chamber (12), and a second sealing groove (T2) opening upward is provided between the second support portion (16) and the peripheral wall of the ventilation chamber (12); PCB waterproof sealant is injected into the second sealing groove (T2) of the lower shell (1), and then the PCBA circuit board (5) is sealed and adhered from the lower end surface to the top of the ventilation chamber (12) and the power interface chamber (13), so that the ventilation chamber (12) is covered and sealed by the PCBA circuit board (5) to form a sealed cavity, and a gap is provided between the breathable membrane (2) and the PCBA circuit board (5).

10. The micro air pressure regulating valve according to claim 9, characterized in that: It also includes a surface sticker (8); the upper end surface of the upper shell (7) is provided with an annular flange that is higher inside and lower outside to form a circular surface sticker groove (75) with an opening facing upward, and the indicator light hole (74) is located in the center of the surface sticker groove; an easy-to-tear convex portion (76) is provided at any position of the peripheral wall of the surface sticker groove (75); the shape of the surface sticker (8) corresponds to the surface sticker groove (75) and a transparent portion is provided at the indicator light hole (74), and the surface sticker (8) is adhered to the surface sticker groove (75); the upper end surface of the PCBA circuit board (5) is also provided with a working status indicator light, and the indicator light hole (74) is located above the working status indicator light of the PCBA circuit board (5).

11. The micro air pressure regulating valve according to claim 2, characterized in that: The invention also comprises a rubber sleeve (9); the vent seat (17) is open downward so that the lower end surface of the lower shell (1) is provided with an annular embedding groove (T6) opening downward around the connecting head (17-1); the rubber sleeve (9) is open upward, and its peripheral wall shape corresponds to the peripheral wall of the shell body; the bottom surface of the rubber sleeve (9) is larger than the shell body; a connecting seat (91) is provided in the rubber sleeve (9) at a position corresponding to the embedding groove (T6); a connecting head sleeve hole penetrating from top to bottom is provided in the center of the connecting seat (91); the inner wall of the connecting head sleeve hole is provided with annular sealing ribs evenly spaced apart; the rubber sleeve (9) is tightly fitted on the shell body from below due to its characteristics, and the switch toggle key (19) and the power interface (52) are exposed; the connecting seat (91) is inserted into the embedding groove (T6) and the connecting head sleeve hole is tightly fitted to wrap the connecting head (17-1).

12. The micro air pressure regulating valve according to claim 2, characterized in that: It also includes a connecting buckle (100) and a breathable membrane (2); the vent seat (17) is open downward so that the lower end surface of the lower shell (1) is provided with a downwardly opening annular embedding groove (T6) around the connecting head (17-1); the embedding groove (T6) is provided with an internal thread, and the lower end surface of the lower shell (1) is symmetrically provided with oval-shaped limiting grooves on the left and right sides of the embedding groove (T6); the connecting buckle (100) includes a base plate and a columnar nesting seat (100-1) connected to the upper center of the base plate, the base plate and the nesting seat (100-1) is provided with a third vent hole extending vertically, a connector mounting groove for being sleeved on the connector (17-1) is provided at the upper opening of the nesting seat (100-1), an annular closed cover is provided at the connection between the bottom of the nesting seat (100-1) and the base plate, a quarter-turn external thread portion corresponding to the internal thread of the embedding groove (T6) is provided on the left and right sides of the outer wall of the nesting seat (100-1), and a protruding limit tenon corresponding to the limit groove is provided on both sides of the nesting seat (100-1); The external threaded portion of the connecting buckle (100) of its nesting seat (100-1) is screwed into the embedding groove (T6) of the lower shell (1) by rotating 90 degrees, and the limiting tenon is inserted into the corresponding limiting groove of the lower shell (1) to connect the connecting buckle (100) and the lower shell (1) together. At the same time, the connecting head mounting groove of the connecting buckle (100) is sleeved on the connecting head (17-1), and the closing cover plate is inserted into the embedding groove (T6) for sealing. A sealing rubber ring (100-2) is provided on the outer periphery of the connecting head (17-1) and the bottom of the embedding groove (T6) for further sealing. The two can be separated by rotating the connecting buckle (100) or the lower shell (1) in the opposite direction by 90 degrees. The breathable membrane (2) is adhered to the lower end surface of the connecting buckle (100) to cover the third ventilation hole, and the third ventilation hole is located in the center of the breathable membrane (2).

13. The micro air pressure regulating valve according to claim 10, characterized in that: The power interface (52) adopts a Type-C interface, a DC interface or a magnetic charging interface, or a wireless charging coil is arranged in the upper shell (7); The shell is made of ABS or PC material, and the thickness of the pad (18) is 0.1 to 0.3 mm; the breathable membrane (2) is made of ePTFE material; the battery (6) is a lithium battery, and buffer foam is adhered to the upper and lower parts. The battery (6) is electrically connected to the PCBA circuit board (5) through a 3-pin interface; the surface sticker (8) is made of PVC or PET material.

14. The micro gas pressure regulating valve according to any one of claims 1 to 12, characterized in that: The air inlet (31) of the air pump (3) is located on the lower end surface, and the air outlet (32) is located on the upper end surface. A one-way valve is provided in the air outlet (32) of the air pump (3) so that air can only be discharged but not inlet. The number of the air inlet holes (31) is three and they are distributed in the center of the lower end surface in an equilateral triangle shape. The air outlet (32) of the air pump (3) is directly opposite to the second vent hole (55). The air pump (3) is fixed to the PCBA circuit board (5) with the assistance of the sealing layer (4) and the sealing layer (4) surrounds the air outlet (32) and the second vent hole (55) to form an air seal. The second vent hole (55) is the air outlet of the sealed cavity. The first vent hole (17-2) is the air inlet of the sealed cavity.

15. The micro air pressure regulating valve according to any one of claims 1 to 12, characterized in that: The PCBA circuit board (5) is provided with a Bluetooth, WIFI or NFC wireless connection module, which can observe the pressure value and temperature value of the sealed cavity in real time and adjust the corresponding critical value after being connected through the corresponding APP; the upper shell (7) is made of semi-transparent material.

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