A waterproof and electric shock-proof intelligent charging socket and its application method

By using elastic plug sleeves and airtightness detection units in the intelligent charging plug, the electric shock protection when not in use and the waterproof and anti-electric shock function during use is achieved, and the tightness between the plug and the plug in the prior art is solved. The problem of insufficient problems significantly reduces the risk of use.

CN118017306BActive Publication Date: 2024-12-17SHENZHEN AMC TECH CO LTD
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Patent Information

Application Number
CN202410348042.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-03-26
Publication Date
2024-12-17
Estimated Expiration
2044-03-26

AI Technical Summary

Technical Problem

The existing smart charging drain plugs have shortcomings in waterproof and electric shock. The fitting surface between the plug and the drain plug is insufficient, there is a risk of water inlet, and there is a risk of electric shock when not in use, especially in water mist or water vapor environments. Down.

Method used

A waterproof and electric shock-proof intelligent charging strip plug is designed, using an elastic sleeve and an airtightness detection unit. The sealing and delayed power acquisition function of the plug is realized through the sealing ring and return spring. The plug sleeve is only made after the airtightness detection is passed. Conducts with external power supply to avoid unnecessary current conduction.

Benefits of technology

It effectively avoids the risk of electric shock in the non-use state, and provides waterproof, anti-electric shock and delayed power acquisition functions during use, significantly reducing the risk of use of the plug-in.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present invention relates to a waterproof and electric shock-proof intelligent charging socket strip and an application method thereof, comprising a box body and a panel, wherein an elastic socket is arranged in the box body, a plurality of mutually isolated compartments are arranged in the box body, and a plurality of openings are opened on the panel; the compartment is connected to a plug board through a supporting column, and an annular gap exists between the plug board and the opening; a plurality of plug holes are opened on the plug board, and a movable column and a reset spring are also arranged on the plug board, and the upper end of the movable column passes through the plug board; a lifting unit is arranged in the compartment, and a sealing ring is arranged at the movable end of the lifting unit; an airtightness detection unit is also arranged in the compartment; by applying the method of the present application, not only can the risk of electric shock be effectively avoided when not in use, but also the function of waterproofing, preventing electric shock and delaying power supply is provided when in use, which can greatly reduce the use risk of the socket strip.
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Description

Technical Field

[0001] The present invention relates to the technical field of intelligent charging sockets, and more specifically, to a waterproof and electric shock-proof intelligent charging socket and an application method thereof. Background Art

[0002] A power strip is a commonly used household accessory used to expand the sockets on the wall. As people's lives need them, some power strips with smart charging ports have also been developed. Existing smart charging power strips usually have protection requirements against waterproofing and electric shock. However, in the existing waterproof and electric shock-proof design, the fitting surface between the plug and the power strip is not tight enough, and there is still a risk of water ingress. Moreover, when not in use, if a child inserts a metal stick into the socket, there is still a risk of electric shock. Especially for the scenario where people plug some electrical appliances into the power strip for a long time for convenience, there is still a risk of electric shock if there is splashing water or water mist or water vapor (for example, in the bathroom, in the return of the south wind), etc. The above-mentioned various electric shock situations have been frequently seen in various reports, causing huge losses to people. However, at this stage, there is still a lack of effective protective measures. There is a need for a waterproof and electric shock-proof smart charging power strip and an application method thereof that is waterproof and electric shock-proof and can protect the plug in use. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a waterproof and anti-electric shock intelligent charging socket and an application method thereof in view of the above-mentioned defects of the prior art.

[0004] The technical solution adopted by the present invention to solve its technical problem is:

[0005] A waterproof and electric shock-proof intelligent charging power strip is constructed, comprising a box body and a panel, wherein the box body is provided with an elastic socket matched with the pins of the plug, wherein the box body is provided with a plurality of compartments isolated from each other, the panel is provided with a plurality of openings corresponding to the compartments one by one, and the aperture of the openings is smaller than the outer diameter of the plug; a plug board extending into the opening is connected to the compartment through a supporting column, and an annular gap exists between the plug board and the opening; a plurality of plug holes are provided on the plug board, and the compartment is also provided with an active column triggered when the plug is plugged in and a reset spring for resetting the active column. spring, the upper end of the movable column passes through the plug board; a lifting unit is arranged in the compartment and is triggered to be lifted up when the movable column goes down, and a sealing ring is arranged at the movable end of the lifting unit; in the initial state, the sealing ring is located in the gap and closes the gap, and when the lifting unit is triggered to be lifted up, the sealing ring partially passes through the gap; an air-tightness detection unit is also arranged in the compartment and is triggered when the movable column goes down, and when the air-tightness detection unit is triggered, the compartment is regularly or irregularly tested for air-tightness, and the corresponding elastic socket is connected to the external power supply only after the air-tightness detection is qualified.

[0006] The waterproof and electric shock-proof smart charging socket strip described in the present invention, wherein a guide sleeve for guiding the movement of the movable column is provided at the bottom of the box body, and a touch pressure switch for triggering the operation of the airtightness detection unit is provided at the bottom of the guide sleeve; a first rack is provided on the outer surface of the movable column, and a groove corresponding to the first rack is provided on the outer surface of the guide sleeve, a second rack is provided on the lifting unit, and a gear set for linking the first rack and the second rack is provided in the box body.

[0007] The waterproof and electric shock-proof smart charging socket strip described in the present invention, wherein the lifting unit includes a movable sleeve, and a plurality of positioning columns for positioning the movable sleeve are arranged in the box body, and the plurality of positioning columns are distributed on the inner side or the outer side of the movable sleeve, and the movable sleeve is provided with positioning grooves that cooperate with the positioning columns; the sealing ring is arranged at the upper end of the movable sleeve, and the second rack is arranged on the inner wall of the movable sleeve.

[0008] The waterproof and electric shock-proof smart charging socket strip described in the present invention, wherein the gear set includes a first gear meshed with the first rack, a second gear meshed with the second rack, and a third gear, and the third gear is located between the first gear and the second gear and meshed with both the first gear and the second gear.

[0009] The waterproof and electric shock-proof intelligent charging socket strip described in the present invention, wherein a through hole for the movable column to pass through is provided at the center of the plurality of sockets on the socket board; a limiting ring is provided on the movable column to limit the position with the lower surface of the socket board; the reset spring is sleeved on the movable column and is located between the limiting ring and the upper end surface of the guide sleeve.

[0010] The waterproof and electric shock-proof smart charging socket strip described in the present invention, wherein the airtightness detection unit includes an installation chamber separated from the compartment, and the installation chamber is provided with an elastic airbag, a cam motor for squeezing the elastic airbag, a control unit for controlling the cam motor, an air pressure sensor for detecting the air pressure in the compartment, and an indicator light; the control unit is electrically connected to the cam motor and the air pressure sensor; the air outlet of the elastic airbag is connected to the compartment.

[0011] The waterproof and electric shock-proof smart charging socket strip described in the present invention, wherein, when the touch-pressure switch is touched, the control unit controls the cam motor to run periodically or irregularly, the cam motor gradually squeezes the elastic airbag, and the air pressure sensor detects the air pressure value in the compartment. If the air pressure value rises to a set threshold range, it indicates that the air tightness is good, otherwise the surface air tightness is poor, and the result is fed back to the control unit, and the control unit controls the indicator light to give a corresponding indication; after controlling the cam motor to perform each squeezing operation, the control unit controls the cam motor to reset, and the elastic airbag restores its deformation according to its own elasticity.

[0012] A waterproof and electric shock-proof intelligent charging socket application method is applied to the waterproof and electric shock-proof intelligent charging socket as mentioned above, and its implementation method is as follows:

[0013] In the initial state, the elastic socket remains unpowered; at this time, if the movable column is pressed and triggered by an object other than a plug, the airtightness detection unit fails the airtightness detection because the socket is not closed, and the elastic socket is not powered;

[0014] When the plug of the external electrical appliance is inserted into the socket and moves downward and finally plugs into the elastic socket, the pins on the plug are elastically clamped by the elastic socket; the plug presses the movable column downward, the reset spring is compressed, and the lifting unit is triggered by the movable column to lift the sealing ring, and the sealing ring part passes through the gap and presses against the plug to achieve sealing. At the same time, the movable column moves downward to trigger the airtightness detection unit to perform airtightness detection on the compartment regularly or irregularly. If the detection passes, the elastic socket is connected to the external power supply and the plug is powered; if the detection fails, the elastic socket is disconnected from the external power supply;

[0015] When the plug of the external electrical appliance is unplugged, the movable column is reset under the action of the reset spring, the lifting unit drives the sealing ring to reset downward, the airtightness detection unit ends the operation and disconnects the elastic socket from the external power supply.

[0016] The beneficial effects of the present invention are as follows: in the initial state, the elastic socket remains in an unpowered state; at this time, if the movable column is pressed and triggered by an object other than a plug, the air-tightness detection unit fails the air-tightness detection because the socket is not closed, and the elastic socket is not powered; when the plug of the external electrical appliance is inserted into the socket and moves downward and finally plugs into the elastic socket, the pins on the plug are elastically clamped by the elastic socket; the plug presses the movable column downward, the reset spring is compressed, and the lifting unit is triggered by the movable column to lift the sealing ring, and the sealing ring part passes through the gap and presses against the plug to achieve sealing, and at the same time, the movable column moves downward to trigger the air-tightness detection unit to perform air-tightness detection on the compartment regularly or irregularly, and if the detection passes, the elastic socket is connected to the external power supply and the plug is powered; if the detection fails, the elastic socket is disconnected from the external power supply; when the plug of the external electrical appliance is pulled out, the movable column is reset under the action of the reset spring, and the lifting unit drives the sealing ring to reset downward, the air-tightness detection unit ends the operation and disconnects the elastic socket from the external power supply at the same time;

[0017] By applying the method and technique of the present application, not only can the risk of electric shock be effectively avoided when not in use (no electric shock will occur regardless of being splashed with water, inserted with fingers, or inserted with metal sticks), but also when in use it has the functions of being waterproof (including water mist), anti-electric shock, and delayed power supply, which can greatly reduce the risk of using the power strip. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work:

[0019] Figure 1 Schematic diagram of a waterproof and electric shock-proof intelligent charging socket compartment of a preferred embodiment of the present invention;

[0020] Figure 2 It is a partial cross-sectional view of a waterproof and electric shock-proof smart charging socket according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the following will be described clearly and completely in combination with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are partial embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention.

[0022] The waterproof and electric shock-proof intelligent charging socket of the preferred embodiment of the present invention is as follows Figure 1 See also Figure 2 , including a box body 1 and a panel 2, wherein an elastic socket 10 matched with the pin 30 of the plug 3 is arranged in the box body 1 (the installation and fixing structure of the elastic socket 10 can be arranged as needed), a plurality of compartments 11 isolated from each other are arranged in the box body 1, a plurality of openings 20 corresponding to the compartments 11 are opened on the panel 2, and the aperture of the opening 20 is smaller than the outer diameter of the plug 3; a plug board 13 extending into the opening 20 is connected to the compartment 11 through a support column 12, and an annular gap exists between the plug board 13 and the opening 20; a plurality of plug holes 130 are opened on the plug board 13, and a movable column 15 triggered when the plug 3 is plugged in and a reset spring 16 for resetting the movable column 15 are also arranged on the plug board 13, and the upper end of the movable column 15 passes through the plug board 13; a lifting unit triggered by the movable column when it goes down is arranged in the compartment 11, and a sealing ring 170 is arranged at the movable end of the lifting unit;

[0023] In the initial state, the sealing ring 170 is located in the gap and closes the gap. When the lifting unit is triggered to lift up, the sealing ring 170 partially passes through the gap. The compartment 11 is also provided with an airtightness detection unit 4 which is triggered when the movable column 15 moves downward. When the airtightness detection unit 4 is triggered, the compartment 11 is regularly or irregularly tested for airtightness, and the corresponding elastic socket 10 is connected to the external power supply only after the airtightness detection is qualified.

[0024] In the initial state, the elastic socket 10 remains unpowered; at this time, if the movable column 15 is pressed and triggered by an object other than a plug, since the socket 130 is not closed, the airtightness detection unit 4 fails the airtightness detection, and the elastic socket 10 is not powered;

[0025] When the plug 3 of the external electrical appliance is inserted into the socket 130 and moves downward and finally plugs into the elastic socket 10, the pin 30 on the plug 3 is elastically clamped by the elastic socket 10; the plug 3 presses the movable column 15 downward, the reset spring 16 is compressed, and the lifting unit is triggered by the movable column 15 to lift the sealing ring 170, and the sealing ring 170 partially passes through the gap and presses against the plug 3 to achieve sealing. At the same time, the movable column 15 moves downward to trigger the airtightness detection unit 4 to perform airtightness detection on the compartment 11 regularly or irregularly. If the detection passes, the elastic socket 10 is connected to the external power supply and the plug 3 is powered; if the detection fails, the elastic socket 10 is disconnected from the external power supply.

[0026] When the plug 3 of the external electrical appliance is pulled out, the movable column 15 is reset under the action of the reset spring 16, and the lifting unit drives the sealing ring 170 to reset downward, and the airtightness detection unit 4 ends the operation and disconnects the elastic socket 10 from the external power supply;

[0027] By applying the method and technique of the present application, not only can the risk of electric shock be effectively avoided when not in use (no electric shock will occur regardless of being splashed with water, inserted with fingers, or inserted with metal sticks), but also when in use it has the functions of being waterproof (including water mist), anti-electric shock, and delayed power supply, which can greatly reduce the risk of using the power strip.

[0028] Preferably, a guide sleeve 18 for guiding the movement of the movable column is provided at the bottom of the box body 1, and a touch switch 19 for triggering the operation of the airtightness detection unit is provided at the bottom of the guide sleeve 18; a first rack 150 is provided on the outer surface of the movable column 15, and a groove 180 corresponding to the first rack 150 is provided on the outer surface of the guide sleeve 18, and a second rack 171 is provided on the jacking unit, and a gear set 5 for linking the first rack 150 and the second rack 171 is provided in the box body 1;

[0029] With this structural design, when the movable column 15 moves downward, the first rack 150 drives the gear set 5, and the gear set 5 drives the second rack 171, thereby driving the lifting unit upward. The downward movement of the movable column 15 will eventually trigger the touch-pressure switch 19, thereby allowing the airtightness detection unit 4 to operate. The structure is simple and the layout is reasonable, and it can very well trigger the lifting unit and the airtightness detection unit 4 at the same time.

[0030] Among them, the lifting unit includes a movable sleeve 172, and a plurality of positioning columns 173 for positioning the movable sleeve are arranged in the box body 1. The plurality of positioning columns 173 are distributed on the inner side or the outer side of the movable sleeve, and a positioning groove 174 cooperating with the positioning columns 173 is arranged on the movable sleeve 172; the sealing ring 170 is arranged at the upper end of the movable sleeve 172, and the second rack 171 is arranged on the inner wall of the movable sleeve 172; the structure is reasonable and compact, the movable sleeve 172 has good stability in moving up and down, and good linkage reliability.

[0031] Preferably, the gear set 5 includes a first gear 50 meshing with the first rack, a second gear 51 meshing with the second rack, and a third gear 52, and the third gear 52 is located between the first gear 50 and the second gear 51 and meshes with both the first gear 50 and the second gear 51; the structure is simple, and of course, other existing gear set forms or other linkage structure forms, such as connecting rod assemblies, etc., can also be adopted. The solution obtained by simple replacement of this conventional structure also belongs to the protection scope of this application.

[0032] Preferably, a through hole 131 for the movable column to pass through is provided at the center of the plurality of sockets 130 on the plug board 13; a limiting ring 151 is provided on the movable column 15 for limiting the position with the lower surface of the plug board 13; the return spring 15 is sleeved on the movable column 15 and is located between the limiting ring 151 and the upper end surface of the guide sleeve 18; the structure is simple and the movable column 15 has good movement stability; preferably, the upper end of the movable column 15 can be set to an arc surface or a hemispherical shape.

[0033] Preferably, the airtightness detection unit 4 includes an installation chamber 40 separated from the compartment 11, and an elastic airbag 41, a cam motor 42 for squeezing the elastic airbag 41, a control unit 43 for controlling the cam motor 42, an air pressure sensor 44 for detecting the air pressure in the compartment (the detection end extends into the compartment) and an indicator light 45 (the emitted light can be guided to the panel 2 through the light guide 6) are arranged in the installation chamber 40; the control unit 43 is electrically connected to the cam motor 42 and the air pressure sensor 44; the air outlet of the elastic airbag 41 is connected to the compartment 11;

[0034] When the touch switch 19 is touched, the control unit 43 controls the cam motor 42 to run regularly or irregularly, and the cam motor 42 gradually squeezes the elastic airbag 41 (squeezes the internal gas into the compartment), and the air pressure sensor detects the air pressure value in the compartment 11. If the air pressure value rises to the set threshold range, it indicates that the air tightness is good, otherwise the surface air tightness is poor, and the result is fed back to the control unit 43, and the control unit 43 controls the indicator light 45 to give corresponding indications; after controlling the cam motor 42 to perform each squeezing operation, the control unit 43 controls the cam motor 42 to reset, and the elastic airbag 41 restores its deformation according to its own elasticity; the structure is simple, and air tightness detection can be conveniently performed. If air tightness problems are found, an alarm will be given in time.

[0035] A waterproof and electric shock-proof intelligent charging socket application method is applied to the waterproof and electric shock-proof intelligent charging socket as mentioned above, and its implementation method is as follows:

[0036] In the initial state, the elastic socket remains unpowered; at this time, if the movable column is pressed and triggered by an object other than a plug, the airtightness detection unit fails the airtightness detection because the socket is not closed, and the elastic socket is not powered;

[0037] When the plug of the external electrical appliance is inserted into the socket and moves downward and finally plugs into the elastic socket, the pins on the plug are elastically clamped by the elastic socket; the plug presses the movable column downward, the reset spring is compressed, and the lifting unit is triggered by the movable column to lift the sealing ring, and the sealing ring part passes through the gap and presses against the plug to achieve sealing. At the same time, the movable column moves downward to trigger the airtightness detection unit to perform airtightness detection on the compartment regularly or irregularly. If the detection passes, the elastic socket is connected to the external power supply and the plug is powered; if the detection fails, the elastic socket is disconnected from the external power supply;

[0038] When the plug of the external electrical appliance is unplugged, the movable column is reset under the action of the reset spring, the lifting unit drives the sealing ring downward to reset, the airtightness detection unit ends the operation and disconnects the elastic socket from the external power supply;

[0039] By applying the method and technique of the present application, not only can the risk of electric shock be effectively avoided when not in use (no electric shock will occur regardless of being splashed with water, inserted with fingers, or inserted with metal sticks), but also when in use it has the functions of being waterproof (including water mist), anti-electric shock, and delayed power supply, which can greatly reduce the risk of using the power strip.

[0040] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A waterproof and electric shock-proof intelligent charging socket, comprising a box body and a panel, wherein an elastic socket matching with the pins of a plug is arranged in the box body, characterized in that: The box body is provided with a plurality of compartments isolated from each other, the panel is provided with a plurality of openings corresponding to the compartments one by one, and the aperture of the opening is smaller than the outer diameter of the plug; the compartment is connected with a plug board extending into the opening through a supporting column, and there is an annular gap between the plug board and the opening; the plug board is provided with a plurality of plug holes, the compartment is also provided with a movable column triggered when the plug is plugged in and a reset spring for resetting the movable column, and the upper end of the movable column passes through the plug board; the compartment is provided with a lifting unit triggered by the movable column when it goes down, and the movable end of the lifting unit is provided with a sealing ring; in the initial state, the sealing ring is located in the gap and closes the gap, and when the lifting unit is triggered to lift up, the sealing ring partially passes through the gap; the compartment is also provided with an airtightness detection unit triggered by the movable column when it goes down, and when the airtightness detection unit is triggered, the compartment is regularly or irregularly tested for airtightness, and the corresponding elastic socket is connected to the external power supply only after the airtightness detection is qualified.

2. The waterproof and electric shock-proof intelligent charging socket according to claim 1, characterized in that: A guide sleeve for guiding the movement of the movable column is arranged at the bottom of the box body, and a touch pressure switch for triggering the operation of the airtightness detection unit is arranged at the bottom of the guide sleeve; a first rack is arranged on the outer surface of the movable column, and a groove corresponding to the first rack is arranged on the outer surface of the guide sleeve, a second rack is arranged on the lifting unit, and a gear set for linking the first rack and the second rack is arranged in the box body.

3. The waterproof and electric shock-proof intelligent charging socket according to claim 2, characterized in that: The lifting unit includes a movable sleeve, and a plurality of positioning posts for positioning the movable sleeve are arranged in the box body, and the plurality of positioning posts are distributed on the inner side or the outer side of the movable sleeve, and a positioning groove cooperating with the positioning posts is arranged on the movable sleeve; the sealing ring is arranged at the upper end of the movable sleeve, and the second rack is arranged on the inner wall of the movable sleeve.

4. The waterproof and electric shock-proof intelligent charging socket according to claim 2, characterized in that: The gear set includes a first gear meshed with the first rack, a second gear meshed with the second rack, and a third gear located between the first gear and the second gear and meshed with both the first gear and the second gear.

5. The waterproof and electric shock-proof intelligent charging socket according to claim 2, characterized in that: A through hole for the movable column to pass through is provided at the center of the plurality of sockets on the plug board; a limiting ring is provided on the movable column to limit the position of the lower surface of the plug board; the return spring is sleeved on the movable column and is located between the limiting ring and the upper end surface of the guide sleeve.

6. The waterproof and electric shock-proof intelligent charging socket according to claim 2, characterized in that: The airtightness detection unit includes an installation chamber separated from the compartment, wherein an elastic airbag, a cam motor for squeezing the elastic airbag, a control unit for controlling the cam motor, an air pressure sensor for detecting the air pressure in the compartment, and an indicator light are arranged in the installation chamber; the control unit is electrically connected to the cam motor and the air pressure sensor; and the air outlet of the elastic airbag is connected to the compartment.

7. The waterproof and electric shock-proof intelligent charging socket according to claim 6, characterized in that: When the touch switch is touched, the control unit controls the cam motor to run periodically or irregularly, and the cam motor gradually squeezes the elastic airbag. The air pressure sensor detects the air pressure value in the compartment. If the air pressure value rises to the set threshold range, it indicates that the air tightness is good, otherwise the surface air tightness is poor. The result is fed back to the control unit, and the control unit controls the indicator light to indicate accordingly; after controlling the cam motor to perform each squeezing operation, the control unit controls the cam motor to reset, and the elastic airbag restores its deformation according to its own elasticity.

8. A method for applying a waterproof and electric shock-proof intelligent charging socket, applied to the waterproof and electric shock-proof intelligent charging socket as claimed in any one of claims 1 to 7, characterized in that: Here’s how to do it: In the initial state, the elastic socket remains unpowered; at this time, if the movable column is pressed and triggered by an object other than a plug, the airtightness detection unit fails the airtightness detection because the socket is not closed, and the elastic socket is not powered; When the plug of the external electrical appliance is inserted into the socket and moves downward and finally plugs into the elastic socket, the pins on the plug are elastically clamped by the elastic socket; the plug presses the movable column downward, the reset spring is compressed, and the lifting unit is triggered by the movable column to lift the sealing ring, and the sealing ring part passes through the gap and presses against the plug to achieve sealing. At the same time, the movable column moves downward to trigger the airtightness detection unit to perform airtightness detection on the compartment regularly or irregularly. If the detection passes, the elastic socket is connected to the external power supply and the plug is powered; if the detection fails, the elastic socket is disconnected from the external power supply; When the plug of the external electrical appliance is unplugged, the movable column is reset under the action of the reset spring, the lifting unit drives the sealing ring to reset downward, the airtightness detection unit ends the operation and disconnects the elastic socket from the external power supply.