WO2020103381A1

WO2020103381A1 - Automatic air-pumping sealing box cover and working method therefor

Info

Publication number: WO2020103381A1
Application number: PCT/CN2019/081930
Authority: WO
Inventors: 周天毅; 杨建才; 吕平平; 陈彩霞
Original assignee: 常州百斯福模塑股份有限公司
Priority date: 2018-11-19
Filing date: 2019-04-09
Publication date: 2020-05-28
Also published as: CN109896163A; CN210063923U; CN109896163B

Abstract

Disclosed is an automatic air-pumping sealing box cover, comprising a bottom cover (3) and a top cover (4) being detachably connected to each other, wherein the bottom cover (3) and the top cover (4) are connected to form an equipment cavity, an automatic air-pumping device is mounted in the equipment cavity, and the automatic air-pumping device comprises a power source (5), a pressure sensor, an air pump (8) and a controller; the power source (5) is connected to power source input ends of the pressure sensor, the air pump (8) and the controller; an air pumping port of the air pump (8) and a probe of the pressure sensor are exposed on a lower surface of the bottom cover (3); an output end of the pressure sensor is connected to a collection circuit, and an output end of the collection circuit is connected to the input end of the controller; and a control signal output end of the controller is connected to a switch control end of the air pump (8). The device can realize automatic pressure measurement and air suction to ensure a pressure value in a storage cavity.

Description

Automatically evacuating sealed box lid and its working method

Technical field

The invention belongs to the technical field of storage, in particular to an automatic air-sealable box lid and its working method.

Background technique

In the prior art, when storing items (such as easily oxidized products and food) at normal temperature or low temperature, it is better to use vacuum or inert gas under sealed conditions. From the perspective of convenient operation and monitoring convenience, the evacuation method is more preferable in most cases. At present, there is a sealed box for the evacuation of the manual air pump. The principle is that the manual air pump is fixed / removably connected to the sealed box (also has a belt barometer). This structure is more convenient under general conditions of storage, because personnel often observe the sealed box in the storage state. If the pressure deviates from the requirements (usually, air leakage occurs, etc.), then pump down. However, under the storage conditions with a large number of sealed boxes, it is difficult for the storage personnel (usually inspection or random inspection) to find abnormal pressure in time.

technical problem

In order to solve the above-mentioned problems in the prior art, the present invention proposes a new automatic air-sealing lid and its working method.

Technical solution

An automatic air-sealable box cover includes a bottom cover and a top cover that are detachably connected to each other; the bottom cover and the top cover are connected to form an equipment cavity, and an automatic air extraction device is installed in the equipment cavity;

Automatic pumping device, which includes power supply, pressure sensor, air pump and controller; power supply is connected to the power input end of the pressure sensor, air pump and controller; the air suction port of the air pump and the probe of the pressure sensor are in the storage cavity (in use state) , The box cover is on the box body, the box cover and the box body form a storage cavity); the output end of the pressure sensor is connected to the acquisition circuit, and the output end of the acquisition circuit is connected to the pressure signal input end of the controller; The control signal output terminal is connected to the switch control terminal of the air pump (a medical air pump can be used).

The acquisition circuit includes: a first op amp and a second op amp; the first and second signal output terminals of the pressure sensor are connected to the in-phase terminals of the first and second op amps respectively, and the inverting phases of the first and second op amps The terminals are connected to the output terminals of the first and second op amps; the output terminals of the first and second op amps are connected in series with the first and second buck resistors, and then connected to the inverting terminal and the non-inverting terminal of the third op amp. The output terminal of the third op amp is connected in series with the third step-down resistor and then connected to the pressure signal input terminal of the controller; an RC parallel circuit is provided between the inverting terminal and the output terminal of the third op amp; The output terminal is connected in series with the fourth step-down resistor and then connected to the non-inverting terminal of the third op amp, the inverting terminal of the fourth op amp is connected to the output terminal; the first and second voltage dividing resistors are connected in series at + 2.5V Between the DC power supply terminal and the ground terminal, the in-phase terminal of the fourth operational amplifier is connected to the connection terminal of the first and second voltage-dividing resistors.

The controller is a single chip microcomputer (preferably a 51 series single chip microcomputer), and the controller is connected to a touch screen; the touch screen includes a liquid crystal screen drive circuit connected to the controller, and an output terminal connected to the liquid crystal screen drive circuit A connected liquid crystal screen, and a touch controller connected to the touch control signal input terminal of the liquid crystal screen.

The controller controls the air pump through a MOS tube switch circuit.

It also includes a human-computer interaction module; a signal output terminal of the human-computer interaction module is connected to the human-computer interaction signal input terminal of the microcontroller; a signal input terminal of the human-computer interaction module is connected to the human-machine interaction signal output terminal of the microcontroller. (Human-computer interaction module can be a touch screen)

It also includes a communication unit; the signal output of the communication unit is connected to the communication signal input of the microcontroller; the signal input of the communication unit is connected to the communication signal output of the microcontroller; the output of the power supply is connected to the power input of the communication unit ; The communication unit is a Bluetooth communication module and / or a WIFI communication module.

The upper surface of the bottom cover is provided with a grid for placing the main body of the pressure sensor, a through hole is opened on the bottom surface of the grid, the probe of the pressure sensor communicates with the storage cavity from the through hole, the potting glue is filled in the grid, and the wires of the pressure sensor extend out of the filling Sealant

The upper surface of the bottom cover is provided with a clamping position for installing an air pump, the air pump is fixed in the clamping position, and an elastic isolation pad is connected between the casing of the air pump and the clamping position;

The human-computer interaction module is a touch display screen; a hollow frame is opened on the top cover, the touch display screen is in the hollow frame, and an elastic sealing material is filled between the edge of the touch display screen and the inner edge of the hollow frame;

The PCB board where the controller is located is fixed on the upper surface of the bottom cover;

The power source is a battery, and the battery is detachably connected to a positioning groove on the upper surface of the bottom cover.

In the engineering implementation, a plurality of reinforcing ribs are provided on the upper surface of the bottom cover, and the grid formed by the reinforcing ribs can be used as a grid, a clamping position, a positioning groove, etc. of the above-mentioned safety device device.

The edge of the top cover is provided with an annular groove that opens downwards, and the edge of the bottom cover is provided with an upward-shaped annular rib. The rib is correspondingly installed in the groove, and a ring of expansion water-blocking filling rope is filled in the bottom , Install sealing rubber ring outside the expansion water-blocking filled rope;

The convex rib is provided with a convex block in the horizontal direction, a hole corresponding to the convex block is opened on the wall of the groove, and the convex block is in the hole when the bottom cover and the top cover are connected.

A pressure relief mechanism is also connected to the lid, the pressure relief mechanism includes a solenoid valve and a pressure relief air tube; the air inlet of the pressure relief air tube communicates with the storage cavity, and the air outlet of the pressure relief air tube communicates with the atmosphere; the solenoid valve is connected On the pressure relief air pipe, the controller controls the switch of the solenoid valve through a MOS tube switch circuit;

Or, the pressure relief mechanism includes: a housing, a bubble membrane, a membrane fixing block, a first ventilation column, a compression spring, and a second ventilation column;

The case is connected to the box cover, and the top end of the case is exposed on the top surface of the top cover, and the bottom end of the case is on the bottom surface of the bottom cover;

The inner cavity of the housing is a cylindrical cavity, and the first and second through holes are opened at both ends of the cylindrical cavity; the cylindrical cavity communicates with the storage cavity through the first through hole, and the cylindrical cavity passes through the second The through hole communicates with the atmosphere;

The second ventilation column penetrates into the cylindrical cavity from the first through hole of the cylindrical cavity, the first ventilation column penetrates into the cylindrical cavity from the second through hole, and the top of the second ventilation column is fixed at the first The end of a ventilation column, and the first and second ventilation columns have ventilation holes penetrating both;

The lower outer wall of the second ventilation column is provided with a first annular rib, the outer diameter of the first annular rib is larger than the inner diameter of the first through hole, and a sealing structure is provided between the first annular rib and the first through hole , The first annular rib is outside the cylindrical cavity; the compression spring is connected between the second ventilation column and the cylindrical cavity; there is a gap between the outer wall of the second ventilation column and the inner wall of the cylindrical cavity;

The opening end of the second through hole is connected with a bending edge toward the axis of the cylindrical cavity, and the inner diameter of the circular through hole enclosed by the bending edge is smaller than the inner diameter of the cylindrical cavity;

A second ring-shaped rib is connected to the outer wall of the lower portion of the first ventilation column, the second ring-shaped rib is in the cylindrical cavity, and a seal is connected between the top surface of the second ring-shaped rib and the bottom surface of the bending edge structure;

The outer diameter of the first ventilation column is smaller than the inner diameter of the circular through hole, and the outer diameter of the second annular rib is smaller than the inner diameter of the cylindrical cavity and larger than the inner diameter of the circular through hole;

The bubble film covers the top surface of the first ventilation column, and the top surface of the first ventilation column is provided with a concave, the opening of the vent hole is on the concave surface, and there is a gap between the bottom surface of the bubble film and the concave surface; The membrane fixing block is ring-shaped, the membrane fixing block is pressed against the edge of the bubble membrane, and the edge of the bubble membrane is sealedly connected with the concave;

The bubble film is an elastic film made of an elastic material. In the normal state, the bubble film is convex in the middle. When the bottom pressure of the bubble film is lower than the top pressure, the bubble film is concave in the middle; the middle of the bubble film is in the ring film In the hollow of the fixed block;

When the elastic potential energy of the compression spring is at a minimum, the first annular rib and the first through hole are sealed, and the second annular rib and the bottom surface of the bent edge are sealed.

An automatic evacuation sealed box using the above box cover includes a box body and a box cover, which is characterized in that the bottom cover and the box body are detachably sealed and connected, and a seal ring is provided at the connection between the bottom cover and the box cover; The lid connection constitutes a storage cavity.

The working method of the sealed box cover is characterized by a loss: when the motor is started, when the pressure reaches the set upper limit, it automatically stops; when the pressure reaches the set lower limit, the air pump is automatically started until the upper limit is reached.

Beneficial effect

The invention can realize automatic pressure measurement and inhalation, and ensure the air pressure value in the storage cavity.

BRIEF DESCRIPTION

FIG. 1 is a schematic diagram of an automatic suction sealed box of this embodiment;

FIG. 2 is a schematic top view of the automatic air-sealing box cover of this embodiment

FIG. 3 is a schematic bottom view of the automatic suction sealing box cover of this embodiment

4 is a block diagram of the electrical principle of this embodiment (for clarity, the solenoid valve of the electric pressure relief mechanism is included in the schematic diagram);

5 is a schematic diagram of the position of each electrical device on the upper surface of the bottom cover of this embodiment;

6 is a schematic cross-sectional structural diagram of a pressure relief valve of this embodiment;

7 is a schematic diagram of the top cover / bottom cover connection structure of this embodiment;

8 is a schematic diagram of the pressure sensor and the acquisition circuit in the embodiment;

9 is a schematic diagram of the controller and the acquisition circuit in the embodiment;

10 is a schematic diagram of the liquid crystal screen and the touch controller in the embodiment;

In the picture: box 1, box cover 2, bottom cover 3, top cover 4, power supply (rechargeable battery) 5, battery charging terminal 6, through hole 7 where the pressure sensor probe is located, air pump 8, PCB board 9, touch The display screen 10, the sealing ring 11, the bubble film 12, the film fixing block 13, the first ventilation column 14, the compression spring 15, the second ventilation column 16, the cylindrical cavity 17, the ventilation hole 18, the first annular rib 19, Bending edge 20, the second annular rib 21, the lower protrusion 22 formed on the lower surface of the bottom cover where the battery is located, the position of the suction port of the air pump (the check valve is installed on the suction port) 23, the pressure relief in this example The position 24 of the mechanism, the groove 25 on the edge of the top cover, the rib 26 on the edge of the bottom cover, the expansion water-blocking filler 27, the sealing rubber ring 28, the protrusion 29, and the hole 30 corresponding to the protrusion.

Embodiments of the invention

The case is further explained below with reference to the drawings and specific implementations:

Example 1

As shown in Fig. 1, an automatic evacuation sealed box includes a box body and a box cover, the box body and the box cover are detachably connected, and a sealing ring is provided at the connection between the box body and the box cover; The cavity, in this example, is also connected between the box body and the box cover by folding ear buckles.

As shown in Figures 2 to 5, it also includes an automatic pumping device, which includes a power supply, a pressure sensor, an air pump and a controller; the power supply is connected to the power input end of the pressure sensor, the air pump (preferably a micro air pump) and the controller; the probe of the pressure sensor is in storage In the object cavity; the output end of the pressure sensor is connected to the acquisition circuit, and the output end of the acquisition circuit is connected to the pressure signal input end of the controller; the control signal output end of the controller is connected to the switch control end of the air pump.

The acquisition circuit includes: a first op amp IC11 and a second op amp IC12; the first and second signal output terminals of the pressure sensor IC3 are connected to the in-phase terminals of the first and second op amps respectively, and the first and second op amps The inverting terminals are connected to the output terminals of the first and second op amps; the output terminals of the first and second op amps are connected in series with the first and second buck resistors R13 and R14, respectively, and then connected to the inverting of the third op amp Phase terminal and the same phase terminal, the output terminal of the third op amp is connected in series with the third step-down resistor R20 and then connected to the pressure signal input terminal of the controller; there is an RC between the inverting terminal and the output terminal of the third op amp IC13 Parallel circuit (corresponding to resistor R11 and capacitor C11, respectively); the output terminal of the fourth op amp IC14 is connected in series with the fourth step-down resistor R12 and then connected to the non-inverting terminal of the third op amp, and the inverse phase of the fourth op amp IC14 The terminal is connected to the output terminal; the first and second voltage-dividing resistors (corresponding to resistors R22 and R19, respectively) are connected in series between the + 2.5V DC power supply terminal and the ground terminal, and the non-inverting terminal of the fourth op amp IC14 is connected to the first 2. The connection terminal of the second voltage divider.

The controller is a single-chip IC7 (preferably 51 series single-chip), the controller is connected to a touch display screen; the touch display screen includes a liquid crystal screen drive circuit connected to the above controller (using IC type TM1621C integrated circuit IC2 、 LCD screen IC4 (optional AUO 10.1-inch display-model G101STN01.D) connected to the output of the LCD screen drive circuit, and touch controller IC5 connected to the touch control signal input of the LCD screen (optional The selected models are GT9147, or FT3206, or CY8CTST110, etc.).

The controller controls the air pump through a MOS tube switch circuit.

It also includes a human-computer interaction module; a signal output terminal of the human-computer interaction module is connected to the human-computer interaction signal input terminal of the microcontroller; a signal input terminal of the human-computer interaction module is connected to the human-machine interaction signal output terminal of the microcontroller.

It also includes a communication unit; the signal output of the communication unit is connected to the communication signal input of the microcontroller; the signal input of the communication unit is connected to the communication signal output of the microcontroller; the output of the power supply is connected to the power input of the communication unit .

The communication unit is a Bluetooth communication module and / or a WIFI communication module.

The box cover includes a bottom cover and a top cover that are detachably connected to each other; the bottom cover and the top cover are connected to form an equipment cavity, and the automatic suction device is installed in the equipment cavity; the bottom cover and the box body are detachably sealed and connected ;

The upper surface of the bottom cover is provided with a grid for placing the main body of the pressure sensor. The bottom surface of the grid is provided with a through hole. The probe of the pressure sensor is connected to the storage cavity from the through hole. Sealant

As shown in FIG. 7, the edge of the top cover is provided with an annular groove with an opening downward, and the edge of the bottom cover is provided with an upward-shaped annular rib, the rib is correspondingly installed in the groove, and a circle of expansion is filled in the bottom of the groove The water-blocking filler rope is installed with a sealing rubber ring outside the expansion water-blocking filler rope; the convex rib is provided with a convex block in the horizontal direction, a hole corresponding to the convex block is opened on the wall of the groove, and the bottom cover and the top cover are connected , The bump is in the hole.

A pressure relief mechanism is also connected to the box cover.

One way is (electric mode), the pressure relief mechanism includes a solenoid valve and a pressure relief air tube; the air inlet of the pressure relief air tube communicates with the storage cavity, and the air outlet of the pressure relief air tube communicates with the atmosphere; the solenoid valve is connected to the pressure relief air tube , The controller controls the switching of the solenoid valve through a MOS tube switching circuit.

As shown in Fig. 6, another way is (mechanical way), the pressure relief mechanism includes: a shell, a bubble membrane, a membrane fixing block, a first ventilation column, a compression spring and a second ventilation column;

Example 2

The operation method of the touch screen in Embodiment 1 includes:

Automatic pressure parameter setting: connect and cover the negative pressure measurement standard gauge, triple-click the "POWER" button, the middle number displays "88.8", press the "SET" button, the upper row of numbers increases by 1, release and then press, Until it shows: 5.

Press POWER to enter the factory reset: automatically set the highest pressure to -22KPa and the lowest pressure to -15KPa and save.

When there is negative pressure, start timing. The green number in the first row of the LCD screen displays the accumulated time (hours); when there is no negative pressure, the timing is cleared.

The second row of numbers shows the current pressure (-Kpa).

Long press the "SET" key, the upper row shows the lower limit of the set pressure.

Long press the "POWER" key, the upper row shows the upper limit of the set pressure, and the battery voltage value (/ 100V) is displayed after 5 seconds.

Double-click the "POWER" button to start or close the working state of the air pump. When the motor reaches the upper limit of the set value, it will automatically stop; when the pressure reaches the set lower limit, the air pump will be automatically started until the upper limit is reached.

The "Kpa" sign flashes when the motor is in working state, and is always on when the motor is stopped.

Double-click the "SET" button to cancel the working state of the motor, turn on the solenoid valve to deflate, until the air pressure drops to 0.1KPA or 20 seconds, then delay the solenoid valve for 2 seconds, and the "Kpa" sign does not light up during deflation.

After the user decompresses and opens the lid to access the items, and needs to repressurize, please double-click the "POWER" button to start again.

User setting: triple-click the "POWER" button, the middle display "88.8" and then press the SET button to increase the number on the upper row by 1, release and then press again until it displays: 3.

Press POWER to enter the upper and lower limit settings: in two seconds, the upper flash indicates the upper limit pressure is set, and the lower flash indicates the lower limit pressure set. You can increase it by pressing the "SET" key or press and hold the "SET" key first, then press the "POWER" key to decrease.

After setting, press and hold the "POWER" key until the two rows of numbers display "0" and "0.0", and return to the working state after setting.

Electricity display: 4.2V above full bright four grids, 3.9V-4.2V, three grids, 3.7V-3.9V, two grids, 3.6V-3.7V, one grid, less than 3.5-3.6V does not light, less than 3.5 The V battery frame flashes.

The screen will automatically turn off after 25 seconds of no key activity. When you need to brighten the screen, please press the "POWER" and "SET" keys simultaneously and activate the LCD screen to light up after more than 0.5 seconds.

Alarm when pressure is not reached within 60 seconds: the display flashes three times per second, press any key to exit.

When "P-" is always on, it corresponds to the off state. At this time, the motor will not start automatically. When flashing, it represents the running state, and the motor will keep the air pressure between the set maximum and minimum values.

Obviously, the above examples are only examples for clearly illustrating the present invention, rather than limiting the embodiments of the present invention. For those of ordinary skill in the art, other different forms of changes or changes can be made based on the above description. There is no need to exhaustively list all implementations. However, these obvious changes or changes derived from the spirit of the present invention are still within the protection scope of the present invention.

Claims

An automatic suction sealing box cover, which is characterized by comprising a bottom cover and a top cover which are detachably connected to each other; the bottom cover and the top cover are connected to form an equipment cavity, and an automatic extraction device is installed in the equipment cavity;

The automatic suction device includes a pressure sensor, an air pump and a controller; the suction port of the air pump and the probe of the pressure sensor are exposed to the lower surface of the bottom cover; the output end of the pressure sensor is connected to the acquisition circuit, and the output end of the acquisition circuit is connected to the pressure signal input of the controller End; the control signal output end of the controller is connected to the switch control end of the air pump.
The self-evacuated sealed box cover according to claim 1, wherein the acquisition circuit includes: a first operational amplifier (IC11) and a second operational amplifier (IC12); the first and second signal outputs of the pressure sensor The terminals are connected to the in-phase terminals of the first and second op amps respectively, and the inverting terminals of the first and second op amps are connected to the output terminals of the first and second op amps respectively; the output terminals of the first and second op amps are connected in series After connecting the first and second step-down resistors (R13, R14), they are connected to the inverting and non-inverting terminals of the third op amp. The output of the third op amp is connected in series with the third step-down resistor (R20). The pressure signal input terminal of the controller; there is an RC parallel circuit between the inverting terminal of the third operational amplifier (IC13) and the output terminal; the output terminal of the fourth operational amplifier (IC14) is connected in series with the fourth step-down resistor (R12) Then connect to the non-inverting terminal of the third op amp, the inverting terminal of the fourth op amp (IC14) is connected to the output terminal; the first and second voltage divider resistors are connected in series at the + 2.5V DC power supply terminal and the ground terminal In between, the in-phase terminal of the fourth operational amplifier (IC14) is connected to the connection terminal of the first and second voltage-dividing resistors.
The automatic air-sealing box cover according to claim 2, characterized in that the controller is a single-chip microcomputer, and the controller is connected to a touch screen; the touch screen includes a liquid crystal screen connected to the controller A drive circuit, a liquid crystal screen connected to the output end of the liquid crystal screen drive circuit, and a touch controller connected to the touch control signal input end of the liquid crystal screen.
The automatic air-sealing box cover according to claim 1, wherein the controller controls the air pump through a MOS tube switch circuit.
The self-exhaust airtight sealing box cover according to claim 4, further comprising: a human-computer interaction module; a signal output terminal of the human-machine interaction module is connected to a human-computer interaction signal input terminal of the microcontroller; The signal input terminal is connected to the human-computer interaction signal output terminal of the microcontroller.
The self-evacuated sealed box cover according to claim 4, further comprising a communication unit; the signal output terminal of the communication unit is connected to the communication signal input terminal of the microcontroller; the signal input terminal of the communication unit is connected to the communication of the microcontroller Signal output terminal; the output terminal of the power supply is connected to the power input terminal of the communication unit;

The communication unit is a Bluetooth communication module and / or a WIFI communication module.
The self-evacuated airtight box cover according to claim 5 or 6, The utility model is characterized in that a grid for mounting the pressure sensor body is arranged on the upper surface of the bottom cover, a through hole is opened on the bottom surface of the grid, the probe of the pressure sensor communicates with the bottom surface of the bottom cover from the through hole, and the grid is filled with potting glue and pressure sensor The wire extends out of the potting gel;

The upper surface of the bottom cover is provided with a clamping position for installing an air pump, the air pump is fixed in the clamping position, and an elastic isolation pad is connected between the casing of the air pump and the clamping position;

The human-computer interaction module is a touch display screen; a hollow frame is opened on the top cover, the touch display screen is in the hollow frame, and an elastic sealing material is filled between the edge of the touch display screen and the inner edge of the hollow frame;

The PCB board where the controller is located is fixed on the upper surface of the bottom cover;

The power source is a battery, and the battery is detachably connected to a positioning groove on the upper surface of the bottom cover.
The automatic air-sealing box cover according to claim 1, characterized in that the edge of the top cover is provided with an annular groove with an opening downward, and the edge of the bottom cover is provided with an upward ring-shaped convex edge corresponding to the convex edge Installed in the tank, filled with a ring of expansion water blocking filler in the bottom of the tank, and installing a sealing rubber ring outside the expansion water blocking filler;

The convex rib is provided with a convex block in the horizontal direction, a hole corresponding to the convex block is opened on the wall of the groove, and the convex block is in the hole when the bottom cover and the top cover are connected.
The automatic air-sealing box cover according to claim 1, wherein the box cover is further connected with a pressure relief mechanism, the pressure relief mechanism includes a solenoid valve and a pressure relief air tube; the air inlet of the pressure relief air tube is in communication On the lower surface of the bottom cover, the air outlet of the pressure relief air pipe communicates with the atmosphere; the solenoid valve is connected to the pressure relief air pipe, and the controller controls the switch of the solenoid valve through a MOS tube switch circuit;

Or, the pressure relief mechanism includes: a housing, a bubble membrane, a membrane fixing block, a first ventilation column, a compression spring, and a second ventilation column;

The case is connected to the box cover, and the top end of the case is exposed on the top surface of the top cover, and the bottom end of the case is on the bottom surface of the bottom cover;

The inner cavity of the housing is a cylindrical cavity, with first and second through holes opened at both ends of the cylindrical cavity; the cylindrical cavity communicates with the lower surface of the bottom cover through the first through hole, and the cylindrical cavity passes through the second The through hole communicates with the atmosphere;

The second ventilation column penetrates into the cylindrical cavity from the first through hole of the cylindrical cavity, the first ventilation column penetrates into the cylindrical cavity from the second through hole, and the top of the second ventilation column is fixed at the first The end of a ventilation column, and the first and second ventilation columns have ventilation holes penetrating both;

The lower outer wall of the second ventilation column is provided with a first annular rib, the outer diameter of the first annular rib is larger than the inner diameter of the first through hole, and a sealing structure is provided between the first annular rib and the first through hole , The first annular rib is outside the cylindrical cavity; the compression spring is connected between the second ventilation column and the cylindrical cavity; there is a gap between the outer wall of the second ventilation column and the inner wall of the cylindrical cavity;

The opening end of the second through hole is connected with a bending edge toward the axis of the cylindrical cavity, and the inner diameter of the circular through hole enclosed by the bending edge is smaller than the inner diameter of the cylindrical cavity;

A second ring-shaped rib is connected to the outer wall of the lower portion of the first ventilation column, the second ring-shaped rib is in the cylindrical cavity, and a seal is connected between the top surface of the second ring-shaped rib and the bottom surface of the bending edge structure;

The outer diameter of the first ventilation column is smaller than the inner diameter of the circular through hole, and the outer diameter of the second annular rib is smaller than the inner diameter of the cylindrical cavity and larger than the inner diameter of the circular through hole;

The bubble film covers the top surface of the first ventilation column, and the top surface of the first ventilation column is provided with a concave, the opening of the vent hole is on the concave surface, and there is a gap between the bottom surface of the bubble film and the concave surface; The membrane fixing block is ring-shaped, the membrane fixing block is pressed against the edge of the bubble membrane, and the edge of the bubble membrane is sealedly connected with the concave;

The bubble film is an elastic film made of an elastic material. In the normal state, the bubble film is convex in the middle. When the bottom pressure of the bubble film is lower than the top pressure, the bubble film is concave in the middle; In the hollow of the fixed block;

When the elastic potential energy of the compression spring is at a minimum, the first annular rib and the first through hole are sealed, and the second annular rib and the bottom surface of the bent edge are sealed.
The working method of the automatic suction sealing box cover according to claim 1, characterized in that: when the motor is started, when the pressure reaches the set upper limit, it automatically stops; when the pressure reaches the set lower limit, automatically Start the air pump until the upper limit is reached.