A gas extraction device

Abstract

The utility model discloses a kind of gas extraction device, including base shell, extraction module, pressure sensor, switch module, current detection module, control module and control module, pressure sensor is used to detect the pressure value of container cavity when being powered, the input end of switch module is used to connect with power supply, the output end of switch module is connected with the power end of pressure sensor, the sampling end of current detection module is connected with pump body assembly to detect the working current value of pump body assembly, control module is connected with control module, the output end of pressure sensor, the output end of current detection module, the controlled end of switch module and pump body assembly respectively, act on control module can make control module switch at least between first working state and second working state, wherein, in first working state, control module controls switch module to turn on, in second working state, control module controls switch module to turn off, and the design control is reasonable and stable, convenient and reliable to use.

Description

Technical Field

[0001] This utility model relates to the field of electrical equipment technology, and in particular to a gas extraction device. Background Technology

[0002] Existing gas extraction devices can extract air from the cavity of a container to achieve the purpose of vacuuming. After the required vacuum level is reached, the control module can control the vacuuming device to stop. In the past, there have been various ways to detect the vacuum level in the cavity. For example, a current detection module is used to detect the working current of the pump. When the required vacuum level is reached, the pressure in the cavity drops to the pressure threshold, and the working current will suddenly rise and exceed the current threshold. The control module controls the pump to stop based on this characteristic. However, the current threshold is relatively fixed. The corresponding control module can only stop the pump under a specific vacuum level. Different containers have different material hardness, and excessively high vacuum levels may cause the container to deform. Alternatively, a pressure sensor can be used to detect the gas pressure in the cavity. Users can set a pressure threshold according to actual needs. When the pressure in the cavity is lower than the pressure threshold, the control module can stop the pump. This method is more flexible in selecting the vacuum level. However, some gas extraction devices need to provide a cleaning function. The pump will draw cleaning fluid into the extraction channel used for exhaust during the vacuuming process. At this time, the cleaning fluid will also act on the pressure sensor, causing the pressure sensor to output an interference signal, which will cause the control module to shut down the pump, thus failing to meet the functional requirements. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a gas extraction device that is reasonably and stably controlled, and convenient and reliable to use.

[0004] A gas extraction device according to a first aspect of the present invention includes: a base shell having a connecting structure for connecting to a container such that at least a portion of the wall surface of the base shell and the inner wall of the container form a cavity; the base shell having an outlet and an extraction port capable of communicating with the cavity; an extraction module disposed on the base shell, the extraction module having an extraction flow channel, the first end of the extraction flow channel communicating with the extraction port, and the tail end of the extraction flow channel communicating with the outlet; the extraction module further including a pump assembly at least partially disposed in the extraction flow channel, the pump assembly capable of driving fluid from the extraction port to the outlet; and a pressure sensor disposed on the base shell and at least partially located in the extraction flow channel, the pressure sensor being used for... The system includes: a pressure detection module for detecting the pressure value of the cavity when energized; a switch module, the input of which is connected to the power supply, and the output of which is connected to the power supply of the pressure sensor; a current detection module, the sampling end of which is connected to the pump assembly to detect the operating current value of the pump assembly; a control module disposed in the base shell; and a control module connected to the control module, the output of the pressure sensor, the output of the current detection module, the controlled end of the switch module, and the pump assembly. The control module, acting on the control module, enables the control module to switch between at least a first operating state and a second operating state. In the first operating state, the control module controls the switch module to be turned on; in the second operating state, the control module controls the switch module to be turned off.

[0005] A gas extraction device according to an embodiment of the present invention has at least the following beneficial effects: This utility model relates to a gas extraction device. The base shell can be connected to a container via a connecting structure to form a cavity. The user can select or set a suitable pressure threshold based on the container's material hardness via the control module. In its first operating state, the control module activates the switch module to power the pressure sensor. The control module then controls the pump assembly to extract gas from the cavity. The pressure sensor detects the pressure value in the cavity. When the pressure value falls below the pressure threshold, the control module stops the pump assembly. This flexible pressure threshold selection prevents container deformation during vacuuming, meeting user needs and ensuring a lower vacuum level within the cavity, facilitating material storage and preservation. Furthermore, during vacuuming, the current detection module monitors the pump assembly... The operating current value of the pump assembly is controlled to stop the pump assembly when it is unstable or the suction channel is blocked, preventing the pump assembly from burning out due to overcurrent. When cleaning is required, the user can fill the container with cleaning fluid such as water, invert the container so that the cleaning fluid fills the suction port, and the control module is in a second working state. The control module controls the switch module to turn off, the pressure sensor is not energized and does not output a pressure value to the control module, and the control module controls the pump assembly to run, allowing the cleaning fluid to flow through the suction channel and out from the discharge port, realizing the cleaning function of the suction channel, and will not be misjudged by the signal output of the pressure sensor. The current detection module still detects the operating current value of the pump assembly to ensure the normal operation of the pump assembly. This design is reasonable and stable, convenient and reliable to use.

[0006] According to some embodiments of the present invention, the extraction module is provided with a pressure detection port between the extraction port and the pump body assembly, the pressure detection port is connected to the extraction flow channel, and the pressure sensor is disposed at the pressure detection port so as to be at least partially located in the extraction flow channel.

[0007] According to some embodiments of the present invention, the extraction module further includes a one-way valve, which is located in the extraction flow channel and between the pressure detection port and the pump body assembly. The one-way valve allows fluid to flow from the extraction port to the discharge port while preventing fluid from flowing from the discharge port to the extraction port.

[0008] According to some embodiments of the present invention, the gas extraction device further includes a differential amplification module, the output terminal of the pressure sensor is connected to the input terminal of the differential amplification module, and the output terminal of the differential amplification module is connected to the control module so that the control module is connected to the output terminal of the pressure sensor.

[0009] According to some embodiments of the present invention, the pump assembly includes a pump body, a motor, and a semiconductor switching transistor Q3. The current detection module includes a resistor R21 and a resistor R22. The pump body is located in the pumping channel. The drive shaft of the motor is connected to the pump body to drive the pump body to run. The motor, the switching transistor Q3, and the resistor R22 are connected in sequence to form at least a partial drive branch. The drive branch is used to connect to a power supply. The first end of the resistor R21 is connected to the first end of the resistor R22 and the output end of the switching transistor Q3, respectively. The last end of the resistor R21 is connected to the control module.

[0010] According to some embodiments of the present invention, the switching module includes a semiconductor switching transistor Q1 and a semiconductor switching transistor Q2. The input terminal of the switching transistor Q1 is connected to a power supply, the output terminal of the switching transistor Q1 is connected to a pressure sensor, the input terminal of the switching transistor Q2 is connected to the controlled terminal of the switching transistor Q1, the output terminal of the switching transistor Q2 is grounded, and the control module is connected to the controlled terminal of the switching transistor Q2.

[0011] According to some embodiments of the present invention, an energy storage module is provided inside the base shell, and the energy storage module is connected to the input terminal of the switch module and the pump assembly respectively to supply power.

[0012] According to some embodiments of this utility model, a charging port is provided on the base shell, and a charging module and a charging detection module are provided inside the base shell. The charging port is used to connect to a charging source. The input end of the charging module is connected to the charging port, and the output end of the charging module is connected to the energy storage module. The sampling end of the charging detection module is connected to the charging port to collect a charging signal that indicates whether the charging source is connected to the charging port. The control module is connected to the output end of the charging detection module so as to control the pump assembly to stop running according to the charging signal.

[0013] According to some embodiments of the present invention, the gas extraction device further includes a power detection module, a light indicator module is provided on the base shell, the power detection module is connected to the energy storage module to detect the energy storage power value, and the control module is connected to the power detection module.

[0014] According to some embodiments of the present invention, a tilt detection module is provided inside the base shell. The tilt detection module is used to detect a tilt signal that indicates whether the base shell is tilting. The control module is connected to the output terminal of the tilt detection module so as to control the pump assembly to stop operating according to the tilt signal.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a perspective view of one embodiment of the gas extraction device of this utility model; Figure 2 This is a bottom schematic diagram of one embodiment of the gas extraction device of this utility model; Figure 3 This is a schematic diagram of the internal structure of one embodiment of the gas extraction device of this utility model; Figure 4 This is a schematic diagram of the principle structure of one embodiment of the gas extraction device of this utility model; Figure 5 This is a circuit diagram of the control module of one embodiment of the gas extraction device of this utility model; Figure 6 This is a circuit diagram of the charging module and the charging detection module of one embodiment of the gas extraction device of this utility model; Figure 7 This is a circuit diagram of the switching module of one embodiment of the gas extraction device of this utility model; Figure 8 This is a circuit diagram of the pressure sensor and differential amplifier module of one embodiment of the gas extraction device of this utility model; Figure 9 This is a circuit diagram of the pump body assembly and current detection module of one embodiment of the gas extraction device of this utility model. Figure 10 This is a schematic diagram of the tilt detection module circuit of one embodiment of the gas extraction device of this utility model.

[0017] Figure label: Base shell 100; sealing rubber ring 110; extraction module 200; extraction channel 210; extraction port 220; discharge port 230; pressure detection port 240; pump body assembly 250; one-way valve 260; pressure sensor 310; switch module 320; differential amplifier module 330; voltage regulating module 340; current detection module 400; control module 500; control module 600; light indicator module 700; energy storage module 810; charging port 820; charging module 830; charging detection module 840; power detection module 850; tilt detection module 900. Detailed Implementation

[0018] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0019] In the description of this utility model, it should be understood that the directional descriptions, such as the terms "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and 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. Therefore, they should not be construed as limitations on this utility model.

[0020] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] like Figures 1 to 10As shown, a gas extraction device according to a first aspect embodiment of the present invention includes a base shell 100, an extraction module 200, a pressure sensor 310, a switch module 320, a current detection module 400, a control module 500, and a control module 600. The base shell 100 has a connecting structure for connecting to a container such that at least a portion of the wall surface of the base shell 100 and the inner wall of the container form a cavity. The base shell 100 is provided with an outlet 230 and an extraction port 220 that can communicate with the cavity. A suction module 200 is disposed on the base shell 100. The suction module 200 has a suction flow channel 210, the first end of which communicates with the extraction port 220, and the tail end of which communicates with the discharge port 230. The suction module 200 also includes a pump assembly 250, which is at least partially disposed in the suction flow channel 210. The pump assembly 250 is capable of driving fluid from the extraction port 220 to the discharge port 230. A pressure sensor 310 is disposed on the base shell 100. The pressure sensor 310 is at least partially located in the extraction channel 210. The pressure sensor 310 is used to detect the pressure value of the cavity when energized. The input terminal of the switch module 320 is used to connect to the power supply. The output terminal of the switch module 320 is connected to the power supply terminal of the pressure sensor 310. The sampling terminal of the current detection module 400 is connected to the pump body assembly 250 to detect the operating current value of the pump body assembly 250. The control module 500 is disposed in the base shell 100. The control module 600 is connected to the control module 500, the output terminal of the pressure sensor 310, the output terminal of the current detection module 400, the controlled terminal of the switch module 320, and the pump body assembly 250. Acting on the control module 500, the control module 600 can switch between at least a first working state and a second working state. In the first working state, the control module 600 controls the switch module 320 to be turned on. In the second working state, the control module 600 controls the switch module 320 to be turned off.

[0023] The base shell 100 can be in the shape of a cap. The base shell 100 has an inner cavity to accommodate components such as the extraction module 200 and the control module 600. The bottom of the base shell 100 has a groove, and the bottle mouth of the container can be inserted into the groove. The connection structure can include an internal thread structure set in the inner wall of the groove. The internal thread structure can cooperate with the external thread structure on the outer peripheral wall of the bottle mouth of the container to realize the connection between the base shell 100 and the container. The connection structure can also include a buckle set in the inner wall of the groove. The buckle can be connected with the buckle on the outer peripheral wall of the bottle mouth of the container. A sealing rubber ring 110 can be set in the bottom wall of the groove. The sealing rubber ring 110 can abut against the end face of the bottle mouth of the container, so that the cavity is relatively sealed. The extraction port 220 is located in the bottom wall of the groove. So after the base shell 100 and the container are connected, the extraction port 220 communicates with the cavity, while the discharge port 230 can be located outside the cavity.

[0024] like Figure 5 As shown, the control module 600 can be selected from conventional processors such as MCUs or CPUs and their associated circuits, while the control module 500 can be buttons, knobs, touch screens, or capacitive touch switches mounted on the housing, such as... Figure 8 As shown, the pressure sensor 310 can be selected from conventional pressure-transformer sensor chips. The pressure sensor 310 detects the pressure value of the cavity and generates an electrical signal to be output to the control module 600.

[0025] A light indicator module 700 can also be provided on the base shell 100. The control module 600 is connected to the light indicator module 700. The light indicator module 700 can include multiple LED beads. Some of the LED beads may be the same color or different colors. The color of the light emitted by the light indicator module 700 and the number of LED beads lit can indicate different modes such as gas extraction device start-up, vacuuming, and cleaning.

[0026] In some embodiments of this utility model, an energy storage module 810 is provided inside the base shell 100. The energy storage module 810 can be used as a power supply and is connected to the input terminal of the switch module 320 and the pump body assembly 250 respectively to supply power. The energy storage module 810 may include a battery or a supercapacitor.

[0027] In some embodiments of this utility model, a power supply line may also be provided on the base shell 100. The power supply line can be used to connect to an external power supply to power the pump body assembly 250 and the pressure sensor 310.

[0028] This utility model's gas extraction device has a base shell 100 connected to a container via a connecting structure to form a cavity. The user can select or set a suitable pressure threshold based on the container's material hardness using the control module 500. The control module 600 is in its first working state, controlling the switch module 320 to conduct, thus powering the pressure sensor 310. The control module 600 controls the pump assembly 250 to operate and extract gas from the cavity. The pressure sensor 310 is energized and detects the pressure value in the cavity. When the pressure value in the cavity is lower than the pressure threshold, the control module 600 can control the pump assembly 250 to stop. This flexible selection of the pressure threshold prevents container deformation during vacuuming, meeting user needs and resulting in a lower vacuum level within the cavity, facilitating material storage and preservation. Furthermore, during vacuuming, the current detection module 400 detects the operating current value of the pump assembly 250. When the pump assembly 250 is unstable or the extraction channel 210 is blocked, the pump assembly 250 is stopped to prevent it from burning out due to overflow. When cleaning is required, the user can fill the container with water or other cleaning fluid, invert the container so that the cleaning fluid fills the extraction port 220, and the control module 600 is in its second working state. The control module 600 controls the switch module 320 to turn off, the pressure sensor 310 is not energized and does not output a pressure value to the control module 600, and the control module 600 controls the pump assembly 250 to run, so that the cleaning fluid flows through the extraction channel 210 and flows out from the outlet 230, realizing the cleaning function of the extraction channel 210. The pump assembly 250 will not be misjudged due to the signal output by the pressure sensor 310. The current detection module 400 still detects the operating current value of the pump assembly 250 to ensure the normal operation of the pump assembly 250. This design is reasonable and stable, convenient and reliable to use.

[0029] In some embodiments of this utility model, such as Figure 3 As shown, the extraction module 200 has a pressure detection port 240 between the extraction port 220 and the pump body assembly 250. The pressure detection port 240 is connected to the extraction flow channel 210. The pressure sensor 310 is disposed in the pressure detection port 240 so as to be at least partially located in the extraction flow channel 210.

[0030] Specifically, the extraction module 200 can be equipped with a three-way pipe fitting to form an extraction flow channel 210. The pressure sensor 310 is installed at the pressure detection port 240 of the pipe fitting, so that it can communicate with the cavity through the extraction flow channel 210 to detect the pressure value in the cavity. In order to detect more accurately, the pressure detection port 240 is located between the extraction port 220 and the pump body assembly 250 to communicate directly with the cavity.

[0031] In some embodiments of this utility model, such as Figure 3As shown, the extraction module 200 also includes a one-way valve 260, which is located in the extraction flow channel 210 and between the pressure detection port 240 and the pump body assembly 250. The one-way valve 260 allows fluid to flow from the extraction port 220 to the discharge port 230 while preventing fluid from flowing from the discharge port 230 to the extraction port 220.

[0032] The one-way valve 260 can effectively prevent outside air from flowing back into the cavity and affecting the vacuum level inside the cavity, while also ensuring that the pump assembly 250 operates smoothly and stably during vacuuming.

[0033] In some embodiments of this utility model, such as Figure 6 As shown, the gas extraction device also includes a differential amplifier module 330. The output terminal of the pressure sensor 310 is connected to the input terminal of the differential amplifier module 330, and the output terminal of the differential amplifier module 330 is connected to the control module 600 so that the control module 600 is connected to the output terminal of the pressure sensor 310.

[0034] The differential amplifier module 330 can employ conventional differential amplifier chips and their associated circuitry. For example, the LM358 differential amplifier chip can be selected. The differential amplifier module 330 can suppress common-mode noise and amplify differential-mode signals. It performs differential comparison between the output signal of the pressure sensor 310 and the reference signal to suppress common interference, thereby improving the signal-to-noise ratio. The LM358 differential amplifier chip has high open-loop gain and can stably achieve the set differential amplification function in closed-loop applications.

[0035] In some embodiments of this utility model, the pump assembly 250 includes a pump body (not shown in the figure), a motor M, and a semiconductor switching transistor Q3. The current detection module 400 includes a resistor R21 and a resistor R22. The pump body is located in the pumping channel 210. The drive shaft of the motor is connected to the pump body to drive the pump body to run. The motor, the switching transistor Q3, and the resistor R22 are connected in sequence to form at least a partial drive branch. The drive branch is used to connect to the power supply. The first end of the resistor R21 is connected to the first end of the resistor R22 and the output end of the switching transistor Q3, respectively. The last end of the resistor R21 is connected to the control module 600.

[0036] The pump body can be a pump impeller installed in the extraction flow channel 210. The motor is used to drive the pump impeller to rotate and guide the fluid flow. The switching transistor Q3 can be a transistor, MOSFET, or IGBT, etc. The control module 600 outputs a PWM signal to the controlled terminal of the switching transistor Q3 to control the switching transistor Q3 to turn on and off, thereby driving the motor to run. Resistors R21 and R22 sample the operating current of the motor and form an electrical signal to be output to the control module 600.

[0037] In some embodiments of this utility model, the switching module 320 includes a semiconductor switching transistor Q1 and a semiconductor switching transistor Q2. The input terminal of the switching transistor Q1 is connected to a power supply, the output terminal of the switching transistor Q1 is connected to a pressure sensor 310, the input terminal of the switching transistor Q2 is connected to the controlled terminal of the switching transistor Q1, the output terminal of the switching transistor Q2 is grounded, and the control module 600 is connected to the controlled terminal of the switching transistor Q2.

[0038] Switching transistors Q1 and Q2 can be transistors, MOSFETs, or IGBTs, etc. The control module 600 controls the on / off state of switching transistor Q1 via Q2, thereby controlling whether power is supplied to the pressure sensor 310. Specifically, it may also include a voltage regulation module 340, such as... Figure 7 As shown, the voltage regulating module 340 may include a voltage regulating chip and its auxiliary circuits. The input terminal of the voltage regulating module 340 may be connected to the energy storage module 810. The voltage regulating module 340 modulates the output voltage of the energy storage module 810 to form a voltage that can stably supply power to the pressure sensor 310, thereby ensuring the accuracy of detection.

[0039] In some embodiments of this utility model, a charging port 820 is provided on the base shell 100, and a charging module 830 and a charging detection module 840 are provided inside the base shell 100. The charging port 820 is used to connect to a charging source. The input terminal of the charging module 830 is connected to the charging port 820, and the output terminal of the charging module 830 is connected to the energy storage module 810. The sampling terminal of the charging detection module 840 is connected to the charging port 820 to collect a charging signal that indicates whether the charging source is connected to the charging port 820. The control module 600 is connected to the output terminal of the charging detection module 840 so as to control the pump assembly 250 to stop operating according to the charging signal.

[0040] The charging port 820 can be a USB port, and it can be connected to a power source via a standard charging cable, such as... Figure 6As shown, the charging module 830 can be selected from conventional charging management chips and their auxiliary circuits. The charging module 830 modulates the input voltage and input current of the charging source to form a charging voltage and charging current that can be adapted to charge the energy storage module 810. In order to ensure power supply and stable operation, and to ensure the service life of the energy storage module 810, vacuuming and cleaning functions are not allowed during the charging process. Specifically, the charging detection module 840 can include resistors R1 and R7. The first end of resistor R1 is connected to the charging port 820, and the last end of resistor R1 is connected to the first end of resistor R7 and the control module 600 respectively. The last end of resistor R7 is grounded. When the charging port 820 is connected to the charging source, the first end of resistor R1 is energized, and a voltage divider is formed at the first end of resistor R7 to form a high-level voltage indicating that the charging source is connected to the charging port 820. The control module 600 can then disable the operation of the pump assembly 250. In addition, the control module 600 can also use the light indicator module 700 to indicate whether the charging process is in progress.

[0041] In some embodiments of this utility model, the gas extraction device further includes a power detection module 850, which is connected to the energy storage module 810 to detect the energy storage power value, and the control module 600 is connected to the power detection module 850.

[0042] like Figure 6 As shown, the power detection module 850 may include resistors R2 and R8. The first end of resistor R2 is connected to the positive terminal (BAT+) of the energy storage module 810, and the second end of resistor R2 is connected to the first end of resistor R8 and the control module 600. The second end of resistor R8 is grounded. Resistor R2 can sample the discharge voltage of the energy storage module 810 and form a terminal voltage characterizing the magnitude of the discharge voltage at the first end of resistor R8. The control module 600 can analyze the energy storage capacity value accordingly. In some embodiments of this utility model, the power detection module 850 may also be a coulomb counter or other devices.

[0043] When the container contains material, the base shell 100 and the container tilt, and the operation of the pump assembly 250 may cause the material to be ejected through the extraction channel 210. In some embodiments of this utility model, a tilt detection module 900 is provided inside the base shell 100. The tilt detection module 900 is used to detect a tilt signal that indicates whether the base shell 100 is tilted. The control module 600 is connected to the output terminal of the tilt detection module 900 so as to control the pump assembly 250 to stop running according to the tilt signal.

[0044] like Figure 10As shown, the tilt detection module 900 may include a resistor R3 and a tilt switch S1. The first end of the resistor R3 is connected to the power supply, and the second end of the resistor R3 is connected to the first end of the tilt switch S1 and the control module 600 respectively. The second end of the tilt switch S1 is grounded. When the base shell 100 and the container are placed normally, the tilt switch S1 is in the normally open state. When the tilt angle of the base shell 100 reaches the tilt threshold, such as 45°, or other tilt thresholds, the tilt switch S1 is turned on. The port of the control module 600 connected to the first end of the tilt switch S1 detects a low level. Under the vacuum function, the control module 600 controls the pump assembly 250 to stop running. Under the cleaning function, due to the need of the container, the control module 600 does not need to stop the pump assembly 250.

[0045] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0046] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A gas extraction device, characterized in that, include: A base shell has a connecting structure for connecting to a container such that at least a portion of the wall surface of the base shell and the inner wall of the container form a cavity, and the base shell is provided with a discharge port and an extraction port that can communicate with the cavity. A suction module is disposed in the base shell. The suction module has a suction flow channel. The first end of the suction flow channel is connected to the suction port, and the tail end of the suction flow channel is connected to the discharge port. The suction module also includes a pump assembly at least partially disposed in the suction flow channel. The pump assembly is capable of driving fluid from the suction port to the discharge port. A pressure sensor is disposed in the base shell and the pressure sensor is at least partially located in the extraction channel, the pressure sensor being used to detect the pressure value of the cavity when energized; A switch module, wherein the input terminal of the switch module is connected to a power supply, and the output terminal of the switch module is connected to the power supply terminal of the pressure sensor; A current detection module, wherein the sampling end of the current detection module is connected to the pump body assembly to detect the operating current value of the pump body assembly; The control module is located in the base shell; The control module is connected to the control module, the output terminal of the pressure sensor, the output terminal of the current detection module, the controlled terminal of the switch module, and the pump body assembly. Acting on the control module, the control module can switch between at least a first working state and a second working state. In the first working state, the control module controls the switch module to be turned on, and in the second working state, the control module controls the switch module to be turned off.

2. The gas extraction device according to claim 1, characterized in that: The extraction module has a pressure detection port between the extraction port and the pump body assembly. The pressure detection port is connected to the extraction flow channel, and the pressure sensor is located at the pressure detection port so as to be at least partially located in the extraction flow channel.

3. The gas extraction device according to claim 2, characterized in that: The extraction module also includes a one-way valve located in the extraction flow channel and between the pressure detection port and the pump body assembly. The one-way valve allows fluid to flow from the extraction port to the discharge port while preventing fluid from flowing from the discharge port to the extraction port.

4. The gas extraction device according to claim 1, characterized in that, It also includes a differential amplifier module, the output terminal of the pressure sensor is connected to the input terminal of the differential amplifier module, and the output terminal of the differential amplifier module is connected to the control module so that the control module is connected to the output terminal of the pressure sensor.

5. A gas extraction device according to claim 1, characterized in that, The pump assembly includes a pump body, a motor, and a semiconductor switching transistor Q3. The current detection module includes resistors R21 and R22. The pump body is located in the pumping channel. The drive shaft of the motor is connected to the pump body to drive the pump body to run. The motor, the switching transistor Q3, and the resistor R22 are connected in sequence to form at least a partial drive branch. The drive branch is used to connect to the power supply. The first end of the resistor R21 is connected to the first end of the resistor R22 and the output end of the switching transistor Q3. The last end of the resistor R21 is connected to the control module.

6. The gas extraction device according to claim 1, characterized in that, The switching module includes semiconductor switching transistors Q1 and Q2. The input terminal of the switching transistor Q1 is connected to the power supply, the output terminal of the switching transistor Q1 is connected to the pressure sensor, the input terminal of the switching transistor Q2 is connected to the controlled terminal of the switching transistor Q1, the output terminal of the switching transistor Q2 is grounded, and the control module is connected to the controlled terminal of the switching transistor Q2.

7. The gas extraction device according to claim 1, characterized in that, An energy storage module is provided inside the base shell, and the energy storage module is connected to the input terminal of the switch module and the pump body assembly to supply power.

8. A gas extraction device according to claim 7, characterized in that, The base shell is provided with a charging port, and a charging module and a charging detection module are provided inside the base shell. The charging port is used to connect to a charging source. The input end of the charging module is connected to the charging port, and the output end of the charging module is connected to the energy storage module. The sampling end of the charging detection module is connected to the charging port to collect a charging signal that indicates whether the charging source is connected to the charging port. The control module is connected to the output end of the charging detection module to control the pump assembly to stop operating according to the charging signal.

9. A gas extraction device according to claim 7, characterized in that, It also includes a power detection module, and a light indicator module is provided on the base shell. The power detection module is connected to the energy storage module to detect the energy storage power value, and the control module is connected to the power detection module.

10. A gas extraction device according to claim 1, characterized in that, The base shell is equipped with a tilt detection module, which is used to detect a tilt signal that indicates whether the base shell is tilting. The control module is connected to the output of the tilt detection module so as to control the pump assembly to stop operating according to the tilt signal.

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