TWM513204U - Vacuum pumping apparatus - Google Patents

Abstract

A vacuum pumping apparatus including a main body, a check valve, a pressure sensor and a piezoelectric pump is provided. The main body has an opening portion, a first chamber and a second chamber. The main body is assembled to an opening of a container through the opening portion. The check valve is movably disposed between the opening portion and the first chamber. The opening portion is capable of insulating from or communicating with the first chamber through check valve. The pressure sensor is disposed in the main body and is capable of sensing a pressure in the first chamber. The piezoelectric pump is disposed in the second chamber. The first chamber is capable of insulating from or communicating with the second chamber through piezoelectric pump. The piezoelectric pump is adapted to absorb a gas from the first chamber and the container to the second chamber.

Description

Vacuum pumping device

The present invention relates to a vacuum pumping device, and more particularly to an automatic vacuum pumping device.

In daily life, after the common bags, bottles or foods or drinks packaged in other suitable containers are opened, how to preserve the uneaten or undrinked drinks is a good feeling for consumers. One of the problems that are bothering. Most of the traditional methods of preservation are to place the uneaten food in a sealed can or zipper bag, while the undrinked beverage is separated from the outside air by screwing the cap to the mouth of the bottle. However, the aforementioned conventional preservation method does not extract the air in the container for storing the uneaten food or the undrinked beverage, so the preservation effect is not good.

At present, the technology of vacuum fresh-keeping tanks has been proposed. The principle is to use a suction rod to pump the bottle cap with the design of the gas-blocking valve piece to form a vacuum state inside the container. Compared with the traditional preservation method, the vacuum preservation tank has a better sealing effect, which helps to extend the shelf life of the food or drink. However, when consumers use existing vacuum storage tanks, they do not know the vacuum inside the container. once The vacuum inside the container is insufficient, and the outside air may enter the inside of the container, which is not conducive to the preservation of food or drinks.

The present invention provides a vacuum evacuation device that maintains a closed container in a vacuum state.

The novel creation proposes a vacuum pumping device comprising a body, a check valve, a gas pressure sensor and a piezoelectric pump. The body has an opening, a first chamber, and a second chamber. The opening is separated from the first chamber from each other. The first chamber and the second chamber are separated from each other. The first chamber is located between the opening and the second chamber. The body is adapted to be assembled to the opening of the container through the opening. The check valve is movably disposed between the opening and the first chamber. The opening is selectively sealed or communicated with the first chamber through the check valve. The air pressure sensor is disposed in the body to sense the air pressure in the first chamber. The piezoelectric pump is disposed in the second chamber. The first chamber is selectively sealed or communicated to the second chamber by a piezoelectric pump. The piezoelectric pump is adapted to draw the first chamber and the gas inside the container to the second chamber to maintain a vacuum inside the container.

In an embodiment of the present invention, the vacuum pumping device further includes a seal. The seal is detachably assembled to the opening. The body is adapted to be assembled to the opening of the container through a seal, wherein the seal has a passage and the passage is selectively sealed or communicated with the first chamber through the check valve.

In an embodiment of the present invention, the vacuum pumping device further includes a circuit control unit. The air pressure sensor and the piezoelectric pump are respectively electrically connected to the circuit control unit connection.

In an embodiment of the present invention, the circuit control unit includes a circuit board and a controller electrically connected to the circuit board.

In an embodiment of the present invention, when the air pressure sensor senses that the absolute pressure in the first chamber is greater than or equal to 560 mmHg, the air pressure sensor transmits a signal to the circuit control unit to control the circuit control unit. The piezoelectric pump draws the first chamber and the gas inside the container to the second chamber.

In an embodiment of the present invention, the vacuum pumping device further includes a switch. The switch is disposed on the body and electrically connected to the circuit control unit. When the switch is turned on, the switch actuates the circuit control unit to cause the circuit control unit to drive the piezoelectric pump to extract the gas in the first chamber and the inside of the container to the second chamber.

In an embodiment of the present invention, the vacuum pumping device further includes a power supply unit. The power supply unit is disposed in the body and electrically connected to the circuit control unit.

In an embodiment of the present invention, the vacuum pumping device further includes a warning device. The alarm is disposed on the body and electrically connected to the circuit control unit.

In an embodiment of the present invention, the body further has a partition and a through hole. The partition is located between the first chamber and the second chamber. The through hole penetrates the partition and is selectively sealed or communicated with the second chamber through a piezoelectric pump that is overlaid thereon. When the piezoelectric pump draws the first chamber and the gas inside the container to the second chamber, the check valve moves toward the partition to communicate the first chamber to the second chamber.

In an embodiment of the novel creation, the body further has at least one Groove. The groove is located around the through hole and faces the first chamber. The groove is in communication with the through hole and the first chamber. When the check valve moves toward the partition and abuts against one end of the through hole, the gas in the first chamber and the inside of the container flows into the through hole via the groove.

Based on the above, the vacuum evacuation device of the present invention is adapted to be assembled to the opening of the container, and performs an action of evacuating when the degree of vacuum inside the container is sensed to maintain the container in a vacuum state. In other words, the vacuum evacuation device created by the present invention helps to extend the shelf life of the food or drink placed in the container.

The above described features and advantages of the present invention will become more apparent and understood from the following description.

10‧‧‧ Container

11‧‧‧ openings

100, 100A, 100B‧‧‧ vacuum pumping device

110‧‧‧ body

110a‧‧‧ first chamber

110b‧‧‧ second chamber

111, 111a‧‧‧ openings

111b‧‧‧ card slot

112‧‧‧First partition

112a‧‧‧First through hole

113‧‧‧Second division

113a‧‧‧Second through hole

113b‧‧‧first channel

114‧‧‧ Groove

120, 120a‧‧‧ check valve

121‧‧‧ Umbrella Department

121a‧‧‧ Board Department

122, 122a‧‧ ‧ pillar

123, 123a‧‧‧Limited

124a‧‧‧Protruding

125a‧‧ ribs

130‧‧‧Pneumatic sensor

140‧‧‧Piezoelectric pump

141‧‧ ‧ partition

141a, 142a, 143a‧‧‧through holes

142‧‧‧Piezoelectric layer

143‧‧‧ cover

143b‧‧‧室

150‧‧‧Circuit Control Unit

151‧‧‧ circuit board

152‧‧‧ Controller

152a‧‧‧ frequency control circuit

152b‧‧‧ adjustable booster

152c‧‧‧H bridge drive circuit

160‧‧‧Power supply unit

170‧‧‧ switch

180‧‧‧ warning device

190‧‧‧Seal

190a‧‧‧pressure ring

191‧‧‧second channel

192‧‧‧ card joint

193‧‧‧ Sockets

D‧‧‧ Direction

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic cross-sectional view showing a vacuum pumping device according to an embodiment of the present invention.

2 is a block diagram showing the circuit architecture of the piezoelectric pump of the circuit control unit of FIG. 1.

Fig. 3 is a schematic cross-sectional view showing a vacuum pumping device of another embodiment of the present invention.

4 is a schematic cross-sectional view of a vacuum pumping device according to still another embodiment of the present invention.

Fig. 5 is a schematic view showing the structure of a check valve of another embodiment of the present invention.

1 is a schematic cross-sectional view of a vacuum pumping device according to an embodiment of the present invention; The figure shows and illustrates the state in which the vacuum pumping device 100 is assembled to the container 10. Referring to FIG. 1 , in the present embodiment, the vacuum pumping device 100 includes a body 110 , a check valve 120 , a gas pressure sensor 130 , and a piezoelectric pump 140 . The body 110 has an opening portion 111 and an internal space that communicates with the opening portion 111. Since the outer diameter of the opening portion 111 is, for example, smaller than the inner diameter of the opening 11, the body 110 can be inserted into the opening 11 of the container 10 through the opening portion 111. In addition, the material of the opening portion 111 can have flexibility. Therefore, after the opening portion 111 is inserted into the opening 11, the opening portion 111 can closely abut against the inner wall surface of the opening 11, thereby preventing outside air from the opening portion 111 and the opening 11 The joint enters the interior of the container 10.

The aforementioned internal space may be divided into a first chamber 110a and a second chamber 110b by the first partition portion 112 and the second partition portion 113. As shown in FIG. 1, the opening portion 111 and the first chamber 110a are separated by the first partition portion 112, and the first chamber 110a and the second chamber 110b are separated by the second partition portion 113. . That is, the first partition portion 112 is closer to the opening portion 111 than the second partition portion 113, and the first chamber 110a is located between the opening portion 111 and the second chamber 110b. On the other hand, the first partition portion 112 may have a first through hole 112a, and the second partition portion 113 may have a second through hole 113a, wherein the first through hole 112a and the second through hole 113a are, for example, coaxial. In another embodiment, the first through hole 112a and the second through hole 113a may also be non-coaxial, and are misaligned with each other.

Here, the check valve 120 is, for example, an umbrella check valve (or a check valve) having an umbrella portion 121, a column portion 122 connected to the umbrella portion 121, and a limit around the end of the column portion 122. Bit 123. The umbrella portion 121 and the limiting portion 123 are located at the column portion 122 Relative sides. In detail, the check valve 120 is configured such that the column portion 122 is bored in the first through hole 112 a and is movable back and forth relative to the first partition portion 112 in the direction D. The umbrella portion 121 is located in the first chamber 110a, and the limiting portion 123 is located in the opening portion 111. Since the outer diameter of the limiting portion 123 is, for example, larger than the inner diameter of the first through hole 112a, the limiting portion 123 can be used to prevent the entire column portion 122 from moving into the first chamber 110a.

When the umbrella portion 121 abuts against the first partition portion 112, the opening portion 111 is sealed to the first chamber 110a. When the check valve 120 moves toward the second partition portion 113 to separate the umbrella portion 121 from the first partition portion 112, the opening portion 111 communicates with the first chamber 110a. The air pressure sensor 130 is disposed in the body 110 and is fixed to the second partition 113, for example. The air pressure sensor 130 can sense the air pressure in the first chamber 110a through the first passage 113b of the second partition 113 that communicates with the first chamber 110a. It should be noted that the air pressure sensor 130 can be used to block the first passage 113b from the first chamber 110a and the second chamber 110b, so that the gas cannot flow through the first passage 113b to the first chamber 110a. Between the second chambers 110b.

The piezoelectric pump 140 is disposed on the second partition 113 and located in the second chamber 110b. The piezoelectric pump 140 is composed of, for example, a separator 141, a piezoelectric layer 142, and a cover plate 143, wherein the separator 141 is connected to the second partition portion 113 and covers the second through hole 113a. The partition plate 141 has a through hole 141a that communicates with the second through hole 113a. The piezoelectric layer 142 is located between the spacer 141 and the cover 143 and covers the through hole 141a. The cover plate 143 and the piezoelectric layer 142 define a chamber 143b. On the other hand, the piezoelectric layer 142 has a through hole 142a, and the cover plate 143 has a through hole 143a in which the through holes 142a, 143a communicate with the chamber 143b, respectively. In detail, the first chamber 110a can be made by actuating the piezoelectric pump 140. The second through hole 113a is sealed or communicated with the second chamber 110b.

In the present embodiment, the vacuum pumping device 100 further includes a circuit control unit 150. The circuit control unit 150 may include a circuit board 151 and a controller 152 electrically connected to the circuit board 151. The air pressure sensor 130 can be electrically connected to the controller 152 through the circuit board 151. The piezoelectric pump 140 can be electrically connected to the circuit control unit 150 through a wireless or wired connection. Taking the inside of the container 10 and the first chamber 110a in a vacuum state as an example, the umbrella portion 121 of the check valve 120 abuts against the first partition portion 112 to seal the opening portion 111 to the first chamber 110a. Once outside air enters the interior of the container 10, the degree of vacuum inside the container 10 changes. At this time, the air pressure inside the container 10 is greater than the air pressure of the first chamber 110a, and the check valve 120 is moved toward the second partition 113 due to the aforementioned air pressure difference, so that the umbrella portion 121 is separated from the first partition portion 112, so that The opening portion 111 communicates with the first chamber 110a, so that the degree of vacuum of the first chamber 110a also changes.

When the air pressure sensor 130 senses that the absolute pressure in the first chamber 110a is greater than or equal to 560 mmHg, the air pressure sensor 130 transmits an activation signal to the controller 152, causing the controller 152 to drive the piezoelectric pump 140. The first chamber 110a and the gas inside the container 10 are drawn to the second chamber 110b, and are discharged from the outside of the body 110 by the second chamber 110b. In detail, the controller 152 may apply a voltage to the piezoelectric layer 142 to drive the piezoelectric layer 142 to reciprocally bend and deform along the direction D. During the reciprocating bending deformation of the piezoelectric layer 142, the first chamber 110a and the gas inside the container 10 flow into the chamber 143b unidirectionally through the through hole 141a of the partition 141 and the through hole 142a of the piezoelectric layer 142. And being pressed by the piezoelectric layer 142 from the chamber 143b via the through hole 143a It flows into the second chamber 110b. Thereafter, the gas flowing into the second chamber 110b can be further discharged outside the body 110. Until the air pressure sensor 130 senses that the absolute pressure in the first chamber 110a is greater than or equal to 560 mmHg, the air pressure sensor 130 transmits a stop signal to the controller 152, causing the controller 152 to stop driving the piezoelectric pump 140. Perform the pumping action. At this time, the umbrella portion 121 of the check valve 120 abuts against the first partition portion 112 again to seal the opening portion 111 to the first chamber 110a. Thereby, the container 10 in which the vacuum pumping device 100 is assembled can ensure that the inside thereof is maintained in a vacuum state, thereby contributing to prolonging the shelf life of the food or drink placed in the container 10.

With continued reference to FIG. 1, the body 110 also has at least one recess 114 (two are shown in FIG. 1). The groove 114 is located around the second through hole 113a and faces the first chamber 110a. In detail, the groove 114 is in communication with the second through hole 113a and the first chamber 110a, for example, when the check valve 120 moves toward the second partition 113 and the umbrella portion 121 abuts against the second through hole 113a. At one end, the first chamber 110a and the gas inside the container 10 can still flow into the second through hole 113a via the groove 114.

2 is a block diagram showing the circuit architecture of the piezoelectric pump of the circuit control unit of FIG. 1. Referring to FIG. 1 and FIG. 2 , in the embodiment, the vacuum pumping device 100 further includes a power supply unit 160 . The power supply unit 160 is disposed in the body 110 and electrically connected to the circuit control unit 150. On the other hand, the controller 152 may include a frequency control circuit 152a, an adjustable boost circuit 152b, and an H-bridge drive circuit 152c. The power supply unit 160 is electrically connected to the frequency control circuit 152a and the adjustable boost circuit 152b, thereby providing a frequency control circuit 152a and an adjustable boost circuit 152b to stabilize the power. The frequency control circuit 152a and the adjustable boost circuit 152b are respectively driven by the H bridge. The path 152c is electrically connected, and the H-bridge drive circuit 152c is electrically connected to the piezoelectric pump 140. In detail, the controller 152 can generate a driving signal through the frequency control circuit 152a and transmit it to the H-bridge driving circuit 152c, and generate a driving voltage through the adjustable boosting circuit 152b and transmit it to the H-bridge driving circuit 152c. After the H-bridge drive circuit 152c receives the drive signal and the drive voltage, it outputs a waveform of a specific drive frequency and drive voltage to drive the piezoelectric pump 140.

The frequency control circuit 152a can output a driving signal of a specific frequency to the H-bridge driving circuit 152c according to the optimal resonant frequency of the piezoelectric pump 140, so that the H-bridge driving circuit 152c generates a corresponding _VPP (peak to peak) according to the driving signal of the specific frequency. The waveform is output to the piezoelectric pump 140 so that the piezoelectric pump 140 can perform the pumping action at the aforementioned specific frequency (for example, between 20 kHz and 50 kHz) to keep silent. On the other hand, the adjustable boost circuit 152b can provide a driving voltage to the H-bridge driving circuit 152c according to a specific boosting stage bit, so that the H-bridge driving circuit 152c generates a corresponding _VPP (peak to peak) according to the driving voltage of the specific boosting stage bit. The waveform is output to the piezoelectric pump 140 to increase the pumping efficiency or pumping amount of the piezoelectric pump 140. For example, the operation mode of driving the piezoelectric pump 140 through the frequency control circuit 152a and the H-bridge driving circuit 152c and the adjustable boosting circuit 152b and the H-bridge driving circuit 152c may include the following combinations: (1) maintaining a specific frequency, and Modulate the boost segment; (2) maintain a specific boost segment and modulate the frequency; (3) maintain a specific frequency and maintain a specific boost segment; and (4) modulate the frequency and modulate the boost segment.

Referring to FIG. 1 , in the embodiment, the vacuum pumping device 100 further includes a switch 170 . The switch 170 is disposed on the body 110 and electrically connected to the circuit control unit 150 connection. When the user turns on the switch 170, the switch 170 actuates the circuit control unit 150 to cause the circuit control unit 150 to drive the piezoelectric pump 140 to draw the first chamber 110a and the gas inside the container 10 to the second chamber 110b. Until the air pressure sensor 130 senses that the absolute pressure in the first chamber 110a is greater than or equal to 560 mmHg, the air pressure sensor 130 transmits a stop signal to the controller 152, causing the controller 152 to stop driving the piezoelectric pump 140. Perform the pumping action.

On the other hand, the vacuum pumping device 100 further includes a warning device 180. The warning device 180 is disposed, for example, in the body 110 and electrically connected to the circuit control unit 150. The warning device 180 can issue different warning signals (such as an audible sound) according to the degree of vacuum in the first chamber 110a, so that the user can know the operating state of the vacuum pumping device 100 and the degree of vacuum inside the container 10. For example, when the air pressure sensor 130 senses that the absolute pressure in the first chamber 110a is greater than or equal to 560 mmHg, and the circuit control unit 150 drives the piezoelectric pump 140 to perform the pumping action, the alerter 180, for example The first warning sound is issued to let the user know that the piezoelectric pump 140 is pumping the first chamber 110a that is not in a vacuum state and the inside of the container 10. When the air pressure sensor 130 senses that the absolute pressure in the first chamber 110a is greater than or equal to 560 mmHg, and the controller 152 stops driving the piezoelectric pump 140 to perform the pumping action, the warning device 180 may emit a different from the foregoing. The second warning sound of the first warning sound is to let the user know that the first chamber 110a and the interior of the container 10 have returned to a vacuum state. In another embodiment, the warning device 180 can also be disposed outside the body 110 for issuing a warning sound or a warning light.

Other embodiments are listed below for illustration. Must be stated here It is to be noted that the following embodiments use the same reference numerals and the parts of the foregoing embodiments, and the same reference numerals are used to refer to the same or similar elements, and the description of the same technical content is omitted. For the description of the omitted portions, reference may be made to the foregoing embodiments, and the following embodiments are not repeated.

Fig. 3 is a schematic cross-sectional view showing a vacuum pumping device of another embodiment of the present invention. Referring to FIG. 3, the vacuum pumping device 100A of FIG. 3 is slightly different from the vacuum pumping device 100 of FIG. 1 except that the inner diameter of the opening portion 111a of the present embodiment is, for example, larger than the outer diameter of the opening 11, Therefore, the body 110 can be sleeved in the opening 11 of the container 10 through the opening portion 111a. In addition, the material of the opening portion 111a can have flexibility. Therefore, after the opening portion 111a is sleeved in the opening 11, the opening portion 111 can closely abut against the outer wall surface of the opening 11, thereby preventing outside air from opening the opening portion 111a and opening. The joint of 11 enters the interior of the container 10.

4 is a schematic cross-sectional view showing a vacuum pumping device of another embodiment of the present invention. Referring to FIG. 4, the vacuum pumping device 100B of FIG. 4 is slightly different from the vacuum pumping device 100 of FIG. 1 except that the vacuum pumping device 100B of the present embodiment further includes a sealing member 190. The seal 190 is, for example, a plug having a second passage 191 that is detachably assembled to the opening portion 111. Specifically, the opening portion 111 may have a card slot 111b, and the sealing member 190 may have a latching portion 192 provided corresponding to the card slot 111b. The sealing member 190 can be fixed to the opening portion 111 by the engaging portion 192 being engaged with the engaging groove 111b. In order to improve the reliability of the sealing member 190 being fixed to the opening portion 111, the sealing member 190 may be pressed against the opening portion 111 by the pressing ring 190a. The pressure ring 190a is disposed around the seal 190 and is, for example, engaged with the opening portion 111. In other embodiments, the pressure ring 190a It can also be fixed to the opening portion 111 by means of locking, riveting or ultrasonic welding.

In the present embodiment, the outer diameter of the insertion portion 193 of the sealing member 190 is, for example, smaller than the inner diameter of the opening 11, so that the body 110 can be inserted into the opening 11 of the container 10 through the sealing member 190. Since the material of the sealing member 190 can have flexibility, after the sealing member 190 is inserted into the opening 11, the sealing member 190 can closely abut against the inner wall surface of the opening 11, thereby preventing outside air from the sealing member 190 and the opening 11. The joint enters the interior of the container 10. Alternatively, the second passage 191 can be selectively sealed or communicated with the first chamber 110a through the check valve 120.

Fig. 5 is a schematic view showing the structure of a check valve of another embodiment of the present invention. Referring to FIG. 5, the vacuum pumping device 100, 100A-100B of the above embodiment may employ a check valve 120a as shown in FIG. 5 such that the opening portion 111 (or the second passage 191 of the seal member 190) is selectively Sealed or connected to the first chamber 110a. The check valve 120a is slightly different from the check valve 120 in the above embodiment, except that the check valve 120a may include a plate portion 121a, a column portion 122a connected to the plate portion 121a, and an end surrounding the column portion 122. The stopper portion 123a protrudes from the protruding portion 124a of the plate portion 121a and the plurality of rib portions 125a that connect the protruding portion 124a. The protruding portion 124a and the column portion 122a are located on opposite sides of the plate portion 121a. For example, the check valve 120a may pass through the first through hole 112a of the column portion 122a, and then move back and forth relative to the first partition portion 112 along the direction D. When the plate portion 121a abuts against the first partition portion 112, the opening portion 111 (or the second passage 191 of the seal member 190) is sealed to the first chamber 110a. When the check valve 120a is moved toward the second partition 113 to separate the plate portion 121a from the first partition portion 112, the opening portion 111 (or the second passage 191 of the seal 190) communicates with the first chamber 110a.

In summary, the vacuum pumping device of the present invention is suitable for assembly into the opening of the container, and when the vacuum inside the container is sensed is insufficient, the piezoelectric pump is used for pumping to maintain the container in a vacuum state. . In other words, the vacuum evacuation device created by the present invention helps to extend the shelf life of the food or drink placed in the container. On the other hand, the piezoelectric pump is actuated by the circuit control unit. The controller of the circuit control unit can generate a driving signal through the frequency control circuit and transmit it to the H-bridge driving circuit, and generate a driving voltage through the adjustable boosting circuit and transmit the driving voltage to the H-bridge driving circuit. After the H-bridge drive circuit receives the drive signal and the drive voltage, it outputs a waveform of a specific drive frequency and a drive voltage to drive the piezoelectric pump. Wherein, the frequency control circuit and the H-bridge drive circuit can silence the piezoelectric pump when driving the piezoelectric pump to perform pumping, and the adjustable boost circuit and the H-bridge drive circuit can drive the piezoelectric pump for pumping Increase the pumping efficiency or pumping capacity of the piezoelectric pump. Therefore, the vacuum pumping device created by the present invention has good operational flexibility for the user.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the novel creation, and any person skilled in the art can make some changes without departing from the spirit and scope of the novel creation. Retouching, the scope of protection of this new creation is subject to the definition of the scope of the patent application attached.

10‧‧‧ Container

11‧‧‧ openings

100‧‧‧Vacuum pumping device

110‧‧‧ body

110a‧‧‧ first chamber

110b‧‧‧ second chamber

111‧‧‧ openings

112‧‧‧First partition

112a‧‧‧First through hole

113‧‧‧Second division

113a‧‧‧Second through hole

113b‧‧‧first channel

114‧‧‧ Groove

120‧‧‧ check valve

121‧‧‧ Umbrella Department

122‧‧‧ Column Department

123‧‧‧Limited

130‧‧‧Pneumatic sensor

140‧‧‧Piezoelectric pump

141‧‧ ‧ partition

141a, 142a, 143a‧‧‧through holes

142‧‧‧Piezoelectric layer

143‧‧‧ cover

143b‧‧‧室

150‧‧‧Circuit Control Unit

151‧‧‧ circuit board

152‧‧‧ Controller

160‧‧‧Power supply unit

170‧‧‧ switch

180‧‧‧ warning device

D‧‧‧ Direction

Claims (10)

A vacuum pumping device includes: a body having an opening portion, a first chamber, and a second chamber, wherein the opening portion and the first chamber are separated from each other, the first chamber and the second chamber The chambers are spaced apart from each other, and the first chamber is located between the opening portion and the second chamber, the body is adapted to be assembled through the opening portion to an opening of a container; a check valve is movably disposed on the Between the opening portion and the first chamber, the opening portion is selectively sealed or communicated with the first chamber through the check valve; a pneumatic sensor is disposed in the body for sensing the first portion a pressure chamber in a chamber; and a piezoelectric pump disposed in the second chamber, the first chamber being selectively sealed or connected to the second chamber through the piezoelectric pump, wherein the piezoelectric pump is adapted The first chamber and the gas inside the container are drawn to the second chamber to maintain a vacuum inside the container. The vacuum pumping device of claim 1, further comprising: a sealing member detachably assembled to the opening, the body being adapted to be assembled to the opening of the container through the sealing member, wherein the sealing The member has a passage, and the passage is selectively sealed or communicated with the first chamber through the check valve. The vacuum pumping device of claim 1, further comprising: a circuit control unit, wherein the air pressure sensor and the piezoelectric pump are electrically connected to the circuit control unit, respectively. The vacuum pumping device of claim 3, wherein the circuit control unit comprises a circuit board and a controller electrically connected to the circuit board. The vacuum pumping device of claim 3, wherein when the air pressure sensor senses that the absolute pressure in the first chamber is greater than or equal to 560 mmHg, the air pressure sensor transmits a signal to The circuit control unit causes the circuit control unit to control the piezoelectric pump to extract gas from the first chamber and the interior of the container to the second chamber. The vacuum pumping device of claim 3, further comprising: a switch disposed on the body and electrically connected to the circuit control unit, the switch actuating the circuit when the switch is turned on And a unit that causes the circuit control unit to drive the piezoelectric pump to extract gas from the first chamber and the inside of the container to the second chamber. The vacuum pumping device of claim 3, further comprising: a power supply unit disposed in the body and electrically connected to the circuit control unit. The vacuum pumping device of claim 3, further comprising: a warning device disposed on the body and electrically connected to the circuit control unit. The vacuum pumping device of claim 1, wherein the body further has a partition portion and a through hole, the partition portion being located between the first chamber and the second chamber, the through hole penetrating the through hole a partitioning portion and selectively sealing or communicating with the second chamber through the piezoelectric pump covered thereon, when the piezoelectric pump centers the first chamber And when the gas inside the container is drawn to the second chamber, the check valve moves toward the partition to connect the first chamber to the second chamber. The vacuum pumping device of claim 9, wherein the body further has at least one groove located around the through hole and facing the first chamber, the groove and the through hole and the first The chamber is in communication. When the check valve moves toward the partition and abuts against one end of the through hole, the first chamber and the gas inside the container flow into the through hole via the at least one groove.