CN116742415B

CN116742415B - Protection device of charger

Info

Publication number: CN116742415B
Application number: CN202311006141.XA
Authority: CN
Inventors: 孔杰
Original assignee: Shenzhen Xinsai Technology Co ltd
Current assignee: Shenzhen Xinsai Technology Co ltd
Priority date: 2023-08-10
Filing date: 2023-08-10
Publication date: 2023-11-17
Anticipated expiration: 2043-08-10
Also published as: CN116742415A

Abstract

The invention relates to the field of chargers, and discloses a protection device of a charger, which comprises a charging head, wherein a disconnecting mechanism and a triggering mechanism are arranged in the charging head, the disconnecting mechanism is switched among a normal state, a limiting state and a cutting-off state, the charging head is in the normal state when not inserted into a socket, the charging head is in the limiting state when inserted into the socket, the charging head is in the cutting-off state and actively pulls the charging head away from the socket when the temperature inside the charging head is abnormal, the triggering mechanism enables the disconnecting mechanism to be switched from the limiting state to the cutting-off state when the temperature is abnormal, the triggering mechanism is switched among a normal state, a triggering state I and a triggering state II, the charging process is normally carried out, the charging head is in the normal state when the temperature is abnormal at the joint of a metal pin of the charging head and the socket, and the triggering state II is in the triggering state when the temperature is abnormal at the joint of the charging head and the socket.

Description

Protection device of charger

Technical Field

The invention relates to the field of battery charging, in particular to the field of chargers, and particularly relates to a protection device of a charger.

Background

The charger is used for charging the battery, and along with the continuous development of electronic products, the function of electronic products is increasingly more, the requirement on battery capacity is higher and higher, in order to shorten the charge time, the charger generally adopts the mode of high voltage or heavy current to carry out quick charge, the risk that the charger and battery are easy to generate heat at high temperature has been brought in the quick charge, the charger shell, the power cord epidermis generally adopts plastics to make, the high temperature when charging causes the injury to the charger easily, serious even can take place the fire, consequently, need carry out overheat protection to the charger, in the prior art, generally adopt thermistor response temperature, open circuit when the temperature is unusual, it has some shortages: the circuit is only disconnected, the plug connection between the metal pins and the socket of the charger is still kept, when the charger is charged, more places where heat is generated are generally the metal pins of the charger or the connection between the charging head and the power line, although the circuit is disconnected, the heat of the metal pins is still emitted outwards, the connection between the charger and the socket is relatively closed, the heat is not emitted in time, and a great potential safety hazard still exists.

Based on the above, the invention provides a protection device of a charger.

Disclosure of Invention

In order to solve the above-mentioned problems, the present invention provides a protection device for a charger.

In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows.

The protection device of the charger comprises a charging head, wherein a protection device is arranged in the charging head and comprises a disconnecting mechanism and a triggering mechanism;

the disconnecting mechanism is arranged to switch among a normal state, a limiting state and a cutting-off state, when the charging head is not inserted into the socket, the disconnecting mechanism is in the normal state, when the charging head is inserted into the socket, the disconnecting mechanism is in the limiting state, and when the temperature inside the charging head is abnormal, the disconnecting mechanism is in the cutting-off state and actively pulls the charging head away from the socket;

the trigger mechanism is used for sensing the internal temperature of the charging head in real time, and enables the disconnecting mechanism to be switched from a limit state to a cut-off state when the temperature is abnormal, the trigger mechanism is set to be switched among a normal state, a first trigger state and a second trigger state, when the charging process is carried out normally, the trigger mechanism is in the normal state, when the temperature abnormality occurs at the junction of the charging head and the power line, the trigger mechanism is in the first trigger state, and when the temperature abnormality occurs at the junction of the metal pin of the charging head and the socket, the trigger mechanism is in the second trigger state.

Further, the disconnection mechanism comprises an ejection member, a buckling member and an unlocking member, wherein the ejection member is used for accumulating ejection power in the process that the charging head is inserted into the socket and enabling the inside of the unlocking member to be in a high-pressure state, the buckling member is used for limiting the ejection power release of the ejection member when the charging head is inserted into the socket, the unlocking member is used for being triggered by the triggering mechanism, and the buckling member is enabled to cancel the limitation of the ejection member in a high-pressure driving mode.

Further, the ejection member comprises a cylinder shell, the extending direction of the cylinder shell is parallel to the extending direction of the metal pin of the charging head, a sliding plug is sleeved in the cylinder shell, a push rod extends from the end part of the sliding plug, the tail end of the push rod extends out of the charging head, a main spring positioned on one side of the sliding plug, deviating from the push rod, is sleeved in the cylinder shell, a one-way hole is formed in the end part of the cylinder shell, deviating from the metal pin, and a one-way valve used for enabling air to flow in one way towards the inside of the cylinder shell is arranged in the one-way hole.

Further, the buckling component comprises a buckling part, the buckling part comprises a buckling bracket connected with the outer surface of the cylinder shell, a mounting hole is formed in the end part of the cylinder shell, facing the metal pin, in the radial direction, a clamping rod is slidably arranged in the mounting hole, a second spring is arranged between the clamping rod and the buckling bracket, and when the disconnecting mechanism is in a normal state, the second spring is in a compressed state;

the side face of the clamping rod, which is away from the metal pin, is provided with a poking groove, the poking groove is positioned outside the mounting hole, the clamping bracket is hinged with a switching rod, one end of the switching rod stretches into the poking groove and contacts with the groove wall of the poking groove, which is away from the cylinder shell, and the other end of the switching rod is a contact end;

the outer circle surface of push rod is provided with the draw-in groove, and when the terminal surface of push rod and the terminal surface parallel and level that the charging head was provided with the metal and takes, draw-in groove and mounting hole intercommunication.

Further, the unlocking member comprises a pump shell arranged on the end part of the cylinder shell, which is away from the metal pin, a pump plug and a first spring are sleeved in the pump shell, a connector is arranged on the end part of the pump shell, and the first spring is positioned on one side of the pump plug, which is away from the connector;

the end face of the cylinder shell, which is away from the metal pin, is provided with a middle hole and a middle groove, the middle groove is communicated with the middle hole, the outer surface of the pump shell is provided with a connecting hole communicated with the middle groove, and the connecting hole is positioned at one side of the pump plug, which is towards the joint;

an unlocking component is arranged between the connector and the switching rod and comprises a control valve and a switching component.

Further, the control valve comprises a fixed support, the fixed support is provided with a valve shell, the outer surface of the valve shell is provided with an upper joint mouth and a lower joint mouth which are respectively positioned on two sides of the valve shell, the upper joint mouth is provided with two groups of upper joint mouth I and upper joint mouth II, the lower joint mouth is provided with two groups of lower joint mouth I and lower joint mouth II, the upper joint mouth I and the lower joint mouth I are coaxial, the upper joint mouth II and the lower joint mouth II are coaxial, the two groups of lower joint mouths are communicated through a bottom pipe, and the upper joint mouth I and the joint are communicated through a connecting pipe I.

Furthermore, a valve core is sleeved in the valve housing, one end of the valve core extends out of the valve housing and is provided with a connecting support, the connecting support and the fixed support form sliding fit along the extending direction of the valve core, and a spring III is arranged between the connecting support and the fixed support;

the outer circular surface of the valve core is provided with annular grooves, the annular grooves are provided with two groups of annular grooves I and annular grooves II, when the disconnecting mechanism is in a common state and a limiting state, the annular grooves II are communicated with the upper nozzle II and the lower nozzle II, the annular grooves I are positioned between the upper nozzle I and the upper nozzle II, and when the disconnecting mechanism is in an ejection state, the annular grooves II are positioned between the upper nozzle I and the upper nozzle II, and the annular grooves I are communicated with the upper nozzle I and the lower nozzle I.

Further, the switching component comprises a first outer shell, a first piston is sleeved in the first outer shell, a first piston rod extends from the end face of the first piston, the tail end of the first piston rod extends out of the first outer shell and is contacted with the contact end of the switching rod, and the contact point of the first piston rod and the switching rod and the contact point of the toggle groove and the switching rod are both positioned on the same side of the switching rod;

the first outer shell is communicated with the bottom pipe through a second connecting pipe.

Further, the trigger mechanism comprises a trigger valve group, the trigger valve group is positioned at one side of the control valve, which is away from the cylinder shell, the trigger valve group comprises a first trigger valve and a second trigger valve, the first trigger valve and the second trigger valve both comprise a second outer shell, a second piston is sleeved in the second outer shell, a second piston rod extends from the end face of the second piston, the tail end of the second piston rod extends out of the second outer shell and is in contact with the connecting support, and the area, which is positioned at one side of the second piston, away from the second piston rod is a thermal expansion area;

the triggering mechanism further comprises a first heat conducting pipe and a second heat conducting pipe, a socket for plugging a power line is arranged on the charging head, the first heat conducting pipe is used for conducting heat between the socket and the first triggering valve, and the second heat conducting pipe is used for conducting heat between the metal pin and the second triggering valve.

Compared with the prior art, the invention has the beneficial effects that:

the invention can timely find out the abnormal internal temperature of the charging head and timely lead the charging head to be far away from the socket in the charging process, and can be known by referring to the description of the working principle of the invention in the specific implementation mode:

1. the trigger mechanism drives the control valve to switch the state, so that the buckle component withdraws the limit on the push rod, and the significance of the trigger mechanism is that: in the invention, when the temperature of the charging head is abnormal, the connection between the charging head and the socket is disconnected, the circuit connection is disconnected, on one hand, the continuous rise of the temperature is avoided, on the other hand, when the temperature rises instantaneously to cause accidents such as fire, the socket is isolated from the charging head, so that the fire does not influence the rest good socket or the charging head, therefore, the longer and better the distance between the charging head and the socket is, the larger the elastic coefficient of the main spring is, the larger the elasticity of the released is, the charging head is far away from the socket as far as possible, but the larger the elasticity of the main spring is, the higher the pressure of the clamping rod in the clamping groove is, the force required by the clamping rod to be separated from the clamping groove is, if the clamping rod is driven to be separated from the clamping groove by the thermal expansion of the thermal expansion medium, or the clamping rod is not driven to be separated from the clamping groove by the thermal expansion medium, that is not enough, namely, the clamping rod is driven to be separated from the clamping groove by the thermal expansion medium, the thermal expansion medium is not driven to be separated from the clamping groove, the clamping head is not driven to be separated from the clamping groove, namely, the charging head is not driven to be separated from the inner part of the charging head by the thermal expansion medium, and the charging head is not timely switched, and the temperature is timely, the charging head is timely switched to be far from the inner part, and the charging head is timely disconnected from the charging medium is timely, the charging medium is timely controlled, and the charging head is in the abnormal;

2. the invention utilizes the elastic force of the main spring to release so as to drive the charging head to be far away from the socket, so that the faster the elastic force of the main spring is released, the more the charging head can be timely far away from the socket and far away from the socket, otherwise, the slower the elastic force is released, the charging head can not be timely far away from the socket and relatively close to the socket, and therefore, due to the one-way valve, in the process of releasing the elastic force of the main spring, the outside air enters the cylinder shell through the one-way valve, the one-way hole corresponding to the one-way valve on the cylinder shell is provided with enough space, and the one-way hole can be provided with a large size, so that the outside air can quickly enter the cylinder shell, and the main spring can quickly complete the elastic force release.

Drawings

FIG. 1 is a schematic diagram of the structure of the present invention;

fig. 2 is a cross-sectional view of a charging head;

FIG. 3 is a cross-sectional view of the ejection member, pump housing, and catch components;

FIG. 4 is a schematic view of the cartridge housing and the snap feature;

FIG. 5 is a schematic view of an unlocking member;

FIG. 6 is a schematic diagram of a control valve;

FIG. 7 is a partial cross-sectional view of a control valve;

FIG. 8 is a schematic diagram of a switching component;

FIG. 9 is a schematic view of a snap feature;

FIG. 10 is a schematic view of a trigger mechanism;

FIG. 11 is a schematic diagram of a trigger valve block;

fig. 12 is a cross-sectional view of the charging head after insertion into the receptacle.

The reference numerals in the drawings are:

100. a socket; 200. a charging head; 201. a metal pin;

300. a disconnect mechanism; 301. a cartridge housing; 302. a sliding plug; 303. a push rod; 3031. a clamping groove; 304. a main spring; 305. a one-way valve; 306. a pump housing; 307. a pump plug; 308. a first spring; 309. a snap-fit member; 3091. a buckle bracket; 3092. a clamping rod; 3093. a second spring; 3094. a switching lever; 3095. a toggle groove; 310. a first connecting pipe; 311. a second connecting pipe; 312. a control valve; 3121. a fixed bracket; 3122. a valve housing; 3123. an upper nozzle; 3124. a lower nozzle; 3125. a valve core; 3126. a connecting bracket; 3127. a guide rod; 3128. a third spring; 3129. a bottom tube; 313. a switching part; 3131. an outer shell I; 3132. a first piston; 3133. a first piston rod;

400. a trigger mechanism; 401. triggering a first valve; 402. a first heat conduction pipe; 403. triggering a second valve; 404. a second heat conduction pipe; 405. an outer shell II; 406. a second piston; 407. and a piston rod II.

Detailed Description

In order to further describe the technical means and effects adopted by the present invention for achieving the intended purpose, the following detailed description will refer to the specific implementation, structure, characteristics and effects according to the present invention with reference to the accompanying drawings and preferred embodiments.

As shown in fig. 1-12, a protection device of a charger includes a charging head 200 and a power cord, wherein the charging head 200 is internally provided with the protection device, the protection device includes a disconnecting mechanism 300 and a triggering mechanism 400, wherein:

the disconnection mechanism 300 is configured to switch between a normal state, in which the charging head 200 is not inserted into the socket 100, a limit state, in which the charging head 200 is inserted into the socket 100, and a cut-off state, in which the charging head 200 is actively pulled to be ejected away from the socket 100.

The trigger mechanism 400 is used for sensing the internal temperature of the charging head 200 in the charging state in real time, and when the temperature is abnormal, the disconnection mechanism 300 is switched from the limit state to the cut-off state, when the charging head 200 is charged, the place where more heat is generated is generally the metal pin 201 and the connection part between the charging head 200 and the power line, and the heat generated at the two places is not consistent, therefore, the trigger mechanism 400 is set to switch among the normal state, the first trigger state and the second trigger state, when the charging is in the normal state, the charging is normally performed, when the charging head 200 is in the first trigger state, the connection part between the charging head 200 and the power line is abnormal, when the charging head 200 is in the second trigger state, the connection part between the metal pin 201 and the socket 100 is abnormal, and the trigger mechanism 400 in both the first trigger state and the second trigger state are used for switching the disconnection mechanism 300 from the limit state to the cut-off state.

The opening mechanism 300:

as shown in fig. 3 to 9, the disconnection mechanism 300 includes an ejection member for accumulating ejection power during insertion of the charging head 200 into the socket 100 and making the inside of the unlocking member in a high-pressure state, a latch member for restricting ejection power release of the ejection member when the charging head 200 is inserted into the socket 100, the latch member communicating with the latch member, the unlocking member being for being triggered by the triggering mechanism 400, and the latch member being caused to cancel restriction of the ejection member by a high-pressure driving manner.

Specifically, as shown in fig. 3, the ejection member includes a cartridge 301, and the extending direction of the cartridge 301 is parallel to the extending direction of the metal pins 201 of the charging head 200.

A sliding plug 302 is sleeved in the cylinder shell 301, a push rod 303 extends from the end of the sliding plug 302, the tail end of the push rod 303 extends out of the charging head 200 and is flush with the free end of the metal pin 201, a main spring 304 positioned on one side of the sliding plug 302 away from the push rod 303 is sleeved in the cylinder shell 301, a one-way valve 305 is arranged at the end of the cylinder shell 301 away from the metal pin 201, and the one-way valve 305 is used for enabling air to flow unidirectionally in the cylinder shell 301.

When charging head 200 is inserted toward socket 100, push rod 303 contacts socket 100, so that slide plug 302 moves relatively in cartridge 301, and main spring 304 is compressed, that is, disconnect mechanism 300 is switched from the normal state toward the limit state.

Specifically, as shown in fig. 3, 4 and 9, the latching member includes latching parts 309, and preferably, for stability in the limiting, the latching parts 309 are provided in two groups and are located at both sides of the ejection member, respectively.

The catch member 309 comprises a catch bracket 3091 attached to the outer surface of the cartridge 301.

The end of the cylinder shell 301 facing the metal pin 201 is provided with a mounting hole along the radial direction, a clamping rod 3092 is slidably arranged in the mounting hole, a second spring 3093 is arranged between the clamping rod 3092 and the clamping bracket 3091, and when the disconnection mechanism 300 is in a normal state, the second spring 3093 is in a compressed state.

One end of the clamping rod 3092 extends out of the mounting hole, a poking groove 3095 is formed in the side face, away from the metal pins 201, of the clamping rod 3092, and the poking groove 3095 is located outside the mounting hole.

The switch rod 3094 is hinged on the buckle bracket 3091, the hinge shaft formed at the hinge position is perpendicular to the clamp rod 3092, one end of the switch rod 3094 extends into the toggle groove 3095 and contacts with the slot wall of the toggle groove 3095 away from the cylinder shell 301, and the other end is named as a contact end.

The outer circle surface of the push rod 303 is provided with a clamping groove 3031, when the end face of the push rod 303 is flush with the end face of the charging head 200, where the metal pins 201 are arranged, of the charging head 200 in the process that the disconnecting mechanism 300 is switched from the normal state to the limit state, the clamping groove 3031 is communicated with the mounting hole, at this time, the second spring 3093 starts to release the elastic force, so that the clamping rod 3092 is inserted into the clamping groove 3031, namely, the push rod 303 is limited to move through the clamping component 309, and the main spring 304 is further limited to release the elastic force, at this time, the disconnecting mechanism 300 is in the limit state.

Specifically, as shown in fig. 3 and fig. 5-8, the unlocking member includes a pump casing 306 disposed at an end of the cylinder casing 301 facing away from the metal pin 201, the pump casing 306 is provided with two sets of chambers that are not communicated with each other, a pump plug 307 and a first spring 308 are respectively disposed in each set of chambers, the first spring 308 in each set of chambers is disposed between the pump plugs 307 in each set of chambers, and a joint is disposed at a side of each set of chambers facing away from each other.

The end face of the cylinder shell 301 facing away from the metal pin 201 is provided with a middle hole and a middle groove, the middle groove is communicated with the middle hole, the middle groove is provided with two groups of grooves and is respectively positioned on two sides of the middle hole, the outer surface of the pump shell 306 is provided with a connecting hole communicated with the middle groove, and the connecting hole is positioned on one side of the pump plug 307 facing the joint.

In the process of switching the opening mechanism 300 from the normal state to the limit state, air in the cylinder shell 301 is pushed by the sliding plug 302, and sequentially passes through the middle hole, the middle groove and the connecting hole to enter the cavity in the pump shell 306, so that the air pressure in the pump shell 306 is increased, and the first spring 308 is compressed.

As shown in fig. 5, the unlocking member further includes an unlocking assembly disposed between the joint and the switching lever 3094, and the unlocking assembly is correspondingly provided with two groups.

The unlocking assembly includes a control valve 312 and a switching member 313.

As shown in fig. 5 to 7, the control valve 312 includes a fixed support 3121, a valve housing 3122 is provided on the fixed support 3121, an upper nozzle 3123 and a lower nozzle 3124 are provided on an outer surface of the valve housing 3122, which are respectively located at both sides of the valve housing 3122, and the upper nozzle 3123 is provided with two groups: the upper nozzle one and the upper nozzle two, the lower nozzle 3124 is provided with two groups: the lower nozzle I and the lower nozzle II are coaxial, the upper nozzle I and the lower nozzle II are coaxial, the two groups of lower nozzles 3124 are communicated through a bottom pipe 3129, and the upper nozzle I and the joint are communicated through a connecting pipe 310.

A valve core 3125 is sleeved in the valve housing 3122, one end of the valve core 3125 extends out of the valve housing 3122 and is connected with a connecting support 3126, the connecting support 3126 and the fixed support 3121 form sliding fit along the extending direction of the valve core 3125 through a guide rod 3127, and a spring III 3128 is arranged between the connecting support 3126 and the fixed support 3121.

The outer circular surface of the valve core 3125 is provided with annular grooves, and the annular grooves are provided with two groups of annular grooves, namely an annular groove I and an annular groove II; when the disconnecting mechanism 300 is in the normal state and the limit state, the second ring groove is communicated with the second upper nozzle and the second lower nozzle, the first ring groove is positioned between the first upper nozzle and the second upper nozzle, namely the first upper nozzle and the first lower nozzle are blocked, and the control valve 312 is in the first control state; when the breaking mechanism 300 is in the ejection state, the annular groove II is positioned between the upper nozzle I and the upper nozzle II, namely, the upper nozzle II and the lower nozzle II are plugged, the annular groove I is communicated with the upper nozzle I and the lower nozzle I, and the control valve 312 is in the control state II; the switching of the state of the control valve 312 is achieved by the movement of the linking bracket 3126 with the movement of the valve spool 3125, the movement of the linking bracket 3126 being actuated by the trigger mechanism 400.

As shown in fig. 8, the switching member 313 includes an outer housing first 3131, a piston first 3132 is sleeved in the outer housing first 3131, a piston rod first 3133 extends from an end surface of the piston first 3132, a tip end of the piston rod first 3133 extends out of the outer housing first 3131 and contacts a contact end of the switching lever 3094, and a contact point of the piston rod first 3133 and the switching lever 3094 and a contact point of the toggle groove 3095 and the switching lever 3094 are located on the same side of the switching lever 3094.

Communication is achieved between the first housing body 3131 and the bottom tube 3129 through the second connection tube 311.

In the process of switching the opening mechanism 300 from the normal state to the limit state, since the control valve 312 is in the first control state, the pump casing 306 and the first connecting pipe 310 are in the high pressure state;

when the temperature of the charging head 200 is abnormal and the triggering mechanism 400 is triggered, the triggering mechanism 400 pushes the connection support 3126 to move, so that the control valve 312 is switched to the second control state, the high-pressure gas in the pump casing 306 flows into the first outer casing 3131 through the first connecting pipe 310, the first upper connecting pipe, the first annular groove, the first lower connecting pipe 311, the second bottom pipe 3129 and the first connecting pipe 3132 in sequence, and pushes the first piston 3132 to move, the first piston 3132 moves along with the first piston rod 3133, the first piston rod 3133 moves to push the switching rod 3094 to swing, so that the clamping rod 3092 is separated from the clamping groove 3031, the clamping component 309 releases the restriction on the push rod 303, the first spring 308 releases the elastic force, and the charging head 200 is ejected from the socket 100 under the action of the reaction force through the push rod 303, namely: charging head 200 is disconnected from receptacle 100 and charging head 200 is remote from receptacle 100.

Trigger mechanism 400:

as shown in fig. 10, the trigger mechanism 400 includes trigger valve groups, which are provided in two groups corresponding to the control valves 312.

The trigger valve block is located on the side of the control valve 312 facing away from the cartridge 301.

The trigger valve group comprises a first trigger valve 401 and a second trigger valve 403.

As shown in fig. 11, the first trigger valve 401 and the second trigger valve 403 each include a second outer housing 405, a second piston 406 is sleeved in the second outer housing 405, a second piston rod 407 extends from an end surface of the second piston 406, and a terminal end of the second piston rod 407 extends out of the second outer housing 405 and contacts the connection support 3126.

As shown in fig. 10 and 11, the triggering mechanism 400 further includes a first heat conducting tube 402 and a second heat conducting tube 404, wherein a socket for plugging a power cord is disposed on the charging head 200, one end of the first heat conducting tube 402 is connected to a socket hole wall, the other end of the first heat conducting tube passes through a second housing 405 of the first triggering valve 401 and then is connected to the socket hole wall, a region of the second housing 405, which is located on a side of the second piston 406, facing away from the second piston rod 407, is named as a thermal expansion region, a thermal expansion medium, such as air, mercury, etc., is disposed in the thermal expansion region, a portion of the first heat conducting tube 402 passing through the second housing 405 is located in the thermal expansion region, and when the temperature at the thermal expansion region is abnormal, the thermal expansion medium in the thermal expansion region thermally expands to push the second piston 406 and the second piston rod 407, and further push the connection support 3126 to move, so as to switch the control valve 312 into the second control state.

The inside of the metal pin 201 is hollow and is provided with a thermal expansion medium, the metal pin 201 is communicated with the second shell 405 of the second trigger valve 403 through the second heat conduction pipe 404, the communicating part of the second heat conduction pipe 404 and the second shell 405 is positioned at one side of the second piston 406, which is away from the second piston rod 407, when the temperature abnormality occurs at the connecting part of the metal pin 201 and the socket 100 during charging, the thermal expansion medium in the metal pin 201 thermally expands to push the second piston 406 and the second piston rod 407 to move so as to push the connecting support 3126 to move, so that the control valve 312 is switched into the second control state, and preferably, the thermal expansion medium is liquid, such as mercury, on one hand, the thermal expansion trigger can be realized, and on the other hand, the liquid can play a role in absorbing heat and reducing temperature at the connecting part of the metal pin 201 and the socket 100.

The working principle of the invention is as follows:

plug-in process of charging head 200 and socket 100:

inserting charging head 200 into socket 100, during this process, push rod 303 contacts with socket 100, so that sliding plug 302 moves relatively in barrel housing 301, main spring 304 is compressed, disconnecting mechanism 300 is switched from normal state to limit state, during the switching process, air in barrel housing 301 is pushed by sliding plug 302, and enters into the cavity in pump housing 306 through middle hole, middle groove and connecting hole in turn, so that air pressure in pump housing 306 is increased, and first spring 308 is compressed;

when the end surface of the push rod 303 is flush with the end surface of the charging head 200 provided with the metal pins 201, the clamping groove 3031 is communicated with the mounting hole, at this time, the second spring 3093 starts to release the elastic force, so that the clamping rod 3092 is inserted into the clamping groove 3031, that is, the push rod 303 is limited to move by the fastening component 309, and the main spring 304 is further limited to release the elastic force, at this time, the disconnection mechanism 300 is in a limiting state.

In the charging process, when temperature abnormality occurs:

the abnormal temperature causes thermal expansion of the thermal expansion medium, the triggering mechanism 400 pushes the connection support 3126 to move, so that the control valve 312 is switched to the second control state, the high-pressure gas in the pump casing 306 flows into the first housing 3131 through the first connecting pipe 310, the first upper connecting nozzle, the first annular groove, the first lower connecting nozzle, the bottom pipe 3129 and the second connecting pipe 311 in sequence, and pushes the first piston 3132 to move, the first piston 3132 moves together with the first piston rod 3133, the first piston rod 3133 moves to push the switching rod 3094 to swing, the clamping rod 3092 is disengaged from the clamping groove 3031, the clamping part 309 releases the restriction on the push rod 303, the first spring 308 releases the elastic force and acts on the socket 100 through the push rod 303, and the charging head 200 is ejected from the socket 100 under the action of the reaction force, namely: charging head 200 is disconnected from receptacle 100 and charging head 200 is remote from receptacle 100.

In the triggering process of the temperature abnormality, the following steps are adopted:

1. the triggering mechanism 400 drives the control valve 312 to switch states, so that the buckle component 309 removes the restriction on the push rod 303, which is that: in the invention, when the temperature of the charging head 200 is abnormal in the charging process, the connection between the charging head 200 and the socket 100 is disconnected, and the charging head 200 is far away from the socket 100, on one hand, the circuit connection is disconnected, so that the temperature is prevented from rising continuously, and on the other hand, when the temperature rises instantaneously to cause accidents such as fire, the socket 100 and the charging head 200 are isolated, so that the fire does not influence the rest of the socket 100 or the charging head 200, therefore, the farther the distance between the charging head 200 and the socket 100 is, the better the elastic coefficient of the main spring 304 is, the higher the released elastic force is, the charging head 200 is far away from the socket 100 as far as possible, but the larger the elastic force accumulated by the main spring 304 is, the larger the pressure received by the clamping rod 3092 in the clamping groove 3031 is, the force required by the clamping rod 3092 is separated from the clamping groove 3031 is larger, if the thermal expansion of the thermal expansion medium is used for driving the clamping rod 3092 to separate from the clamping groove 3031, the thermal expansion medium is required to receive a very large amount of heat, or the thermal expansion medium is insufficient to drive the clamping rod 3092 to separate from the clamping groove 3031, that is, if the thermal expansion of the thermal expansion medium is used for driving the clamping rod 3092 to separate from the clamping groove 3031, the clamping rod 3092 cannot be timely separated from the clamping groove 3031 when the temperature inside the charging head 200 is abnormal, the charging head 200 cannot be timely separated from the socket 100, that is, the charging head 200 cannot be timely protected, and in contrast, in the invention, the thermal expansion of the thermal expansion medium only drives the control valve 312 to perform state switching, and then the clamping rod 3092 is separated from the clamping groove 3031 through the unlocking member, that is, the temperature inside the charging head 200 can be timely sensed, and fed back to the opening mechanism 300, so that the charging head 200 is timely separated from the socket 100;

2. the invention utilizes the elastic force release of the main spring 304 to drive the charging head 200 to be far away from the socket 100, so the faster the elastic force release of the main spring 304 is, the more the charging head 200 can be timely far away from the socket 100 and far away from the socket 100, whereas the main spring 304 has a hindrance when the elastic force release is carried out, the charging head 200 can not be timely far away from the socket 100 and relatively close to the socket 100, and on the contrary, the charging head 200 is relatively slow in elastic force release, because the check valve 305 is arranged, in the elastic force release process of the main spring 304, the outside air enters the cylinder shell 301 through the check valve 305, the check hole corresponding to the check valve 305 on the cylinder shell 301 is provided with enough space, and then the outside air can quickly enter the cylinder shell 301, so that the main spring 304 can finish the elastic force release more quickly, otherwise, the air in the pump shell 306 and the first 3131 of the outer shell is sucked in the elastic force release process of the main spring 304, and the inside space of the charging head 200 is relatively small, and the air in the first connecting pipe 310 and the second connecting pipe 311 is sucked in the elastic force release process of the main spring 304 is relatively slow, that the air is sucked in the elastic force release process of the main spring 305 is not has the main spring, and the elastic force is slow.

The present invention is not limited to the above embodiments, but is capable of modification and variation in detail, and other modifications and variations can be made by those skilled in the art without departing from the scope of the present invention.

Claims

1. The utility model provides a protection device of charger, includes the head that charges, is provided with protection device in the head that charges, its characterized in that: the protection device comprises a disconnecting mechanism and a triggering mechanism;

the trigger mechanism is used for sensing the internal temperature of the charging head in real time, switching the disconnecting mechanism from a limit state to a cut-off state when the temperature is abnormal, setting the trigger mechanism to be switched among a normal state, a first trigger state and a second trigger state, when the charging process is performed normally, the trigger mechanism is in the normal state, when the temperature abnormality occurs at the connection part of the charging head and the power line, the trigger mechanism is in the first trigger state, and when the temperature abnormality occurs at the connection part of the metal pin of the charging head and the socket, the trigger mechanism is in the second trigger state;

the disconnecting mechanism comprises an ejection member, a buckling member and an unlocking member, wherein the ejection member is used for accumulating ejection power in the process of inserting the charging head into the socket and enabling the interior of the unlocking member to be in a high-pressure state;

the ejection member comprises a cylinder shell, the extending direction of the cylinder shell is parallel to the extending direction of the metal pins of the charging head, a sliding plug is sleeved in the cylinder shell, a push rod extends from the end part of the sliding plug, the tail end of the push rod extends out of the charging head, a main spring positioned on one side of the sliding plug, deviating from the push rod, is sleeved in the cylinder shell, a one-way hole is formed in the end part of the cylinder shell, deviating from the metal pins, and a one-way valve for enabling air to flow in one direction towards the cylinder shell is arranged in the one-way hole;

the clamping component comprises a clamping component, the clamping component comprises a clamping bracket connected with the outer surface of the cylinder shell, a mounting hole is formed in the cylinder shell towards the end part of the metal pin in the radial direction, a clamping rod is slidably arranged in the mounting hole, a spring II is arranged between the clamping rod and the clamping bracket, and when the disconnecting mechanism is in a normal state, the spring II is in a compressed state;

the outer circular surface of the push rod is provided with a clamping groove, and when the end surface of the tail end of the push rod is flush with the end surface of the charging head provided with the metal pins, the clamping groove is communicated with the mounting hole;

the unlocking component comprises a pump shell arranged on the end part of the cylinder shell, which is far away from the metal pin, a pump plug and a first spring are sleeved in the pump shell, a connector is arranged on the end part of the pump shell, and the first spring is positioned on one side of the pump plug, which is far away from the connector;

an unlocking component is arranged between the joint and the switching rod, and comprises a control valve and a switching component;

the control valve comprises a fixed support, wherein a valve shell is arranged on the fixed support, an upper joint mouth and a lower joint mouth which are respectively positioned at two sides of the valve shell are arranged on the outer surface of the valve shell, the upper joint mouth is provided with two groups of upper joint mouth I and upper joint mouth II, the lower joint mouth is provided with two groups of lower joint mouth I and lower joint mouth II, the upper joint mouth I is coaxial with the lower joint mouth I, the upper joint mouth II is coaxial with the lower joint mouth II, the two groups of lower joint mouths are communicated through a bottom pipe, and the upper joint mouth I is communicated with the joint through a connecting pipe I;

in the process that the disconnecting mechanism is switched from the normal state to the limit state, air in the cylinder shell is pushed by the sliding plug and sequentially enters the cavity in the pump shell through the middle hole, the middle groove and the connecting hole, so that the air pressure in the pump shell is increased, the first spring is compressed, and the pump shell and the first connecting pipe are in a high-pressure state.

2. A charger protection device according to claim 1, wherein: the valve casing is internally sleeved with a valve core, one end of the valve core extends out of the valve casing and is provided with a connecting support, the connecting support and the fixed support form sliding fit along the extending direction of the valve core, and a spring III is arranged between the connecting support and the fixed support;

3. A charger protection device according to claim 1, wherein: the switching component comprises a first outer shell, a first piston is sleeved in the first outer shell, a first piston rod extends from the end face of the first piston, the tail end of the first piston rod extends out of the first outer shell and is contacted with the contact end of the switching rod, and the contact point of the first piston rod with the switching rod and the contact point of the toggle groove with the switching rod are both positioned on the same side of the switching rod;

4. A charger protection device according to claim 2, wherein: the trigger mechanism comprises a trigger valve group, the trigger valve group is positioned at one side of the control valve, which is far away from the cylinder shell, the trigger valve group comprises a first trigger valve and a second trigger valve, the first trigger valve and the second trigger valve both comprise a second outer shell, a second piston is sleeved in the second outer shell, the end surface of the second piston extends to form a second piston rod, the tail end of the second piston rod extends out of the second outer shell and is contacted with the connecting bracket, and the area of the second outer shell, which is positioned at one side of the second piston, which is far away from the second piston rod, is a thermal expansion area;