A circulating liquid-cooled charging gun

Abstract

The present invention discloses a circulating liquid-cooled charging gun, comprising a charging pile housing and a charging gun, wherein the charging gun is arranged on one side of the outside of the charging pile housing, and a gun holster supporting the charging gun is fixed on the outside of the charging pile housing, a cable housing is connected to the bottom of the charging gun, a cooling unit is arranged on one side of the bottom of the charging pile housing, and a supporting tube connected to the cooling unit is arranged at the bottom of the cable housing; the cable housing is a vertically penetrating flexible insulating tube, and the charging gun includes a shell with a cooling cavity arranged in the middle. The beneficial effect is that the present invention arranges two groups of cross-distributed and spirally extended cooling tubes inside the cable housing, and introduces insulating oil into the cooling tube and the cooling cavity through a liquid pump to cooperate with the cooling unit to form a cooling circuit, so that the insulating oil in the charging gun and the cooling tube, which are in a higher position when not charging, is re-injected into the cooling unit, thereby reducing the weight of the charging gun and the charging cable, and improving the convenience of personnel in taking and operating the charging gun and pulling the charging cable.

Description

Technical Field

[0001] The present invention relates to the field of electric vehicle charging equipment, and in particular to a circulating liquid-cooled charging gun. Background Art

[0002] In recent years, new energy vehicles have begun to spread rapidly around the world with their clean and environmentally friendly power sources and excellent conversion efficiency, but their long charging time has been criticized. Users of traditional internal combustion engine vehicles have become accustomed to refueling times of about five minutes, and it is difficult for them to accept charging times of several hours, which has greatly affected the development speed of electric vehicles. In particular, the uninterrupted operation requirements of electric buses have even more stringent requirements on charging time. With the continuous improvement of battery temperature control technology, the miniaturization of power modules, and the technical requirements of national policies for charging speed, charging with higher currents has become an inevitable trend. However, increasing the current will cause serious heating of the charging cable and charging gun. Increasing the cross-sectional area of ​​the wire can reduce the heat generation to a certain extent, but the thicker charging cable increases the weight of the cable. The weight of the existing charging cable has seriously affected the user experience, and the increased cable cross-section in cold areas will further deteriorate the flexibility of the charging cable;

[0003] Developing liquid cooling is an effective way to solve the heating problem of charging guns. The cooling circuit of existing liquid-cooled charging guns is always full of coolant, which further increases the weight of the charging gun and the charging cable. The weight reduction advantage brought by reducing the cross-section of the wires by adding a liquid cooling system cannot be brought into play. There are still problems of heavy weight and inconvenient handling. In addition, the length of the cooling circuit inside the charging cable is equal to the length of the charging cable. The coolant stays in the charging cable for a short time, resulting in poor cooling effect. Summary of the invention

[0004] The purpose of the present invention is to provide a circulating liquid-cooled charging gun in order to solve the above-mentioned problem. Two groups of cross-distributed and spirally extended cooling pipes are arranged inside the cable shell. The insulating oil in the charging gun and the cooling pipes, which are at a higher position when not charging, is returned to the cooling unit, thereby reducing the weight of the charging gun and the charging cable, and improving the convenience for personnel to take and operate the charging gun and pull the charging cable. See the following description for details.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A circulating liquid-cooled charging gun provided by the present invention comprises a charging pile outer cover and a charging gun, wherein the charging gun is arranged on one side of the outside of the charging pile outer cover, and a gun holster supporting the charging gun is fixed on the outside of the charging pile outer cover, a cable housing is connected to the bottom of the charging gun, a cooling unit is arranged on one side of the bottom of the charging pile outer cover, and a supporting pipe connected to the cooling unit is arranged at the bottom of the cable housing;

[0007] The cable shell is a flexible insulating tube that penetrates vertically. The charging gun includes an outer shell with a cooling chamber arranged in the middle. Two groups of spirally extending cooling tubes are staggered inside the cable shell. The top ends of the two groups of cooling tubes extend into the interior of the charging gun and are connected to the cooling chamber, and the bottom ends of the two groups of cooling tubes pass through the interior of the charging pile outer cover along the supporting tube. The liquid inlet and outlet of the cooling unit are respectively connected to the bottom ends of the two groups of cooling tubes.

[0008] When using the above-mentioned circulating liquid-cooled charging gun, when the vehicle needs to be charged, the user holds the shell of the charging gun and grasps the handle, and supports the rotation of the handle by rotating the support rod, so that the transmission groove at the top of the handle pushes the transmission rod to drive the synchronization frame to move toward the end cover, thereby pushing the side plug plate and the bottom plug plate to slide along the side slide groove and the bottom slide groove respectively through the synchronization frame with a wedge-shaped cross-section, and at the same time, the longitudinal spring and the vertical spring are compressed synchronously, and the bottom and both sides of the D-shaped plug composed of the top plug plate, the bottom plug plate and the two groups of side plug plates are synchronously contracted inward, thereby realizing the overall thinning action of the D-shaped plug. At this time, the operator inserts the charging gun into the charging port of the vehicle and releases the handle, and uses the vertical spring and the longitudinal spring to push the bottom plug plate and the side plug plate to reset, and the D-shaped plug The overall shape is restored to ensure that the plug of the charging gun can maintain stability after being inserted into the vehicle charging socket; at the same time, when the charging gun needs to be unplugged from the vehicle charging port, the operator holds the charging gun and grasps the handle, and operates according to the above steps, so as to make the overall size of the D-shaped plug thinner, so as to facilitate the charging gun to be quickly separated from the charging port; during the charging process, the insulating oil in the cooling unit is introduced into a group of cooling pipes through a liquid pump connected to the liquid outlet pipe, and then the insulating oil is guided along the cable housing and the outer casing of the charging gun for circulation cooling through two groups of cooling pipes serving as the upper liquid pipe and the lower liquid pipe respectively; and when the charging gun is idle, the liquid pump is in an inoperative state, and the insulating oil in the cooling chamber and the cooling pipe flows back to the cooling unit, ensuring the portability when taking the charging gun during the next charging process.

[0009] Preferably, a fixed cover connected to the shell is provided at the top of the cable shell, the interior of the cooling unit is filled with insulating oil, the cooling unit includes an outer protective plate fixed to one side of the bottom of the charging pile outer cover, and the interior of the charging pile outer cover is provided with a accommodating cavity for installing the cooling unit.

[0010] Preferably, a filter screen connected to the interior of the charging pile outer cover is arranged inside the accommodating cavity, a radiator is fixed on the outer guard plate inside the accommodating cavity, the radiator includes two groups of side frames arranged symmetrically in the longitudinal direction, and a serpentine-extending heat dissipation copper tube is arranged between the two groups of side frames.

[0011] Preferably, the bottom end of the heat dissipation copper tube is connected to a liquid outlet pipe, and the top end of the heat dissipation copper tube is connected to a liquid inlet pipe, the liquid outlet pipe and the liquid inlet pipe are respectively connected to the bottom ends of the two groups of cooling tubes, and a liquid pump for pumping insulating oil into the charging gun is provided at the junction of the liquid outlet pipe and the cooling tube.

[0012] Preferably, a fan is provided on the side of the radiator away from the outer protective plate, the center of the fan is horizontal with the center of the radiator, the filter is a magnetic metal mesh, and the filter is magnetically adhered to the inside of the accommodating cavity, the accommodating cavity is connected with the inside of the charging pile outer cover through the filter, and the outer protective plate is densely covered with multiple groups of waist-shaped holes.

[0013] Preferably, an end cover is provided at one end of the shell away from the cable housing, and a D-shaped plug is provided on the outside of the end cover, the D-shaped plug includes a top plug plate fixed to the outside of the end cover, two groups of side plug plates are symmetrically provided on both sides of the bottom of the top plug plate, and the bottoms of the two groups of side plug plates are connected to an arc-shaped bottom plug plate, two groups of side slide grooves supporting the side plug plates to slide forward and backward are symmetrically provided in the middle of the end cover, and a bottom slide groove supporting the vertical sliding of the bottom plug plate is provided on the bottom side of the middle of the end cover.

[0014] Preferably, the side slide groove and the bottom slide groove are both fixed with limiting ears on the side extending into the shell, and the side edges of the side plug plate and the bottom plug plate are fixed with T-shaped sliders that slideably match the side slide groove and the bottom slide groove, and the slider of the side plug plate is extended into the shell. A longitudinal axis passing through the limiting ear is fixed, and a longitudinal spring is sleeved on the outer side of the longitudinal axis to tighten the limiting ear.

[0015] Preferably, the slider of the bottom plug plate extends into one side of the shell and is fixed with a vertical shaft passing through a limiting ear, a vertical spring is sleeved on the outer side of the vertical shaft to tighten the limiting ear, and a rectangular frame synchronization frame is slidably arranged inside the shell along its length direction, the synchronization frame has a wedge-shaped cross-section, and the synchronization frame can push the slider to support the side plug plate and the bottom plug plate to gather together.

[0016] Preferably, a U-shaped transmission rod is fixed to the side of the synchronization frame away from the end cover, a rectangular frame is provided at the bottom of the outer shell, a handle is provided inside the frame, a transmission groove for accommodating the transmission rod is provided at the top of the handle, a circular rotating seat is provided in the middle of the handle, and a rotating support rod is fixed in the middle of the frame, which passes through the rotating seat to support the rotation of the handle.

[0017] Preferably, the front and rear sides of the outer shell are provided with clamping grooves, and the holster includes an auxiliary plate fixed to the outside of the charging pile outer cover, and the outside of the auxiliary plate is provided with a C-shaped clamping plate with an opening facing outward to clamp the clamping groove on the outside of the charging gun.

[0018] The beneficial effect is that: the present invention arranges two groups of cross-distributed and spirally extended cooling pipes inside the cable housing, and fills the cooling unit with insulating oil as a cooling medium. When the cable heats up during charging, the insulating oil is introduced into the cooling pipe and the cooling cavity by a liquid pump to cooperate with the cooling unit to form a cooling circuit, so that the insulating oil in the charging gun and the cooling pipe, which are at a higher position when not charging, is returned to the cooling unit, thereby reducing the weight of the charging gun and the charging cable, and improving the convenience of personnel in taking and operating the charging gun and pulling the charging cable;

[0019] Two sets of spirally extended cooling pipes are used as upper liquid pipes and lower liquid pipes respectively to extend the running time of the cooling medium inside the cable housing, thereby improving the cooling effect of the insulating oil on the internal heating cable and ensuring the cooling quality;

[0020] At the same time, the plug of the charging gun is set to a movable structure, and the thickness of the plug can be changed, so that when the charging gun is plugged in and out of the vehicle charging port, the plug can be automatically contracted and thinned by holding the handle, so as to improve the problem of difficulty in plugging and unplugging the existing plug caused by ensuring that the plug is tightly plugged during the charging process, and further improve the operational convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, 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 paying creative work.

[0022] Figure 1 It is a main structural diagram of the present invention;

[0023] Figure 2 It is a three-dimensional structural schematic diagram of the present invention;

[0024] Figure 3 It is a schematic diagram of the structural decomposition of the present invention;

[0025] Figure 4 It is a schematic diagram of the structural disassembly of the cable housing of the present invention;

[0026] Figure 5 is a schematic diagram of the internal structure of the cable housing of the present invention;

[0027] Figure 6 It is a schematic diagram of the internal structure of the cable housing of the present invention;

[0028] Figure 7 It is a schematic diagram of the internal structure of the charging gun of the present invention;

[0029] Figure 8 It is a schematic diagram of the internal structure of the charging gun of the present invention;

[0030] Fig. 9 It is a schematic cross-sectional view of a local structure of a synchronization frame of the present invention;

[0031] Fig.10 It is a schematic diagram of the partial structure disassembly of the charging gun of the present invention;

[0032] Fig.11 It is a schematic diagram of the structural disassembly of the cooling unit of the present invention;

[0033] Fig.12 It is a schematic diagram of the three-dimensional structure of the charging gun of the present invention from another direction.

[0034] The following are the descriptions of the reference numerals:

[0035] 1. Charging pile cover; 2. Cable housing; 201. Cooling pipe; 202. Fixed cover; 3. Charging gun; 301. Housing; 301a. Cooling chamber; 301b. Clamping groove; 302. End cover; 302a. Side slide groove; 302b. Bottom slide groove; 302c. Limiting ear; 303. Top plug plate; 304. Side plug plate; 304a. Longitudinal axis; 304b. Longitudinal spring; 305. Bottom plug plate; 305a. Vertical axis; 305b. Vertical spring; 306. Synchronous Frame; 307, transmission rod; 308, handle; 308a, rotating seat; 308b, transmission groove; 309, accommodating frame; 309a, rotating support rod; 4, cooling unit; 401, outer protective plate; 402, fan; 403, radiator; 403a, side frame; 403b, heat dissipation copper tube; 404, liquid inlet pipe; 405, liquid outlet pipe; 5, support pipe; 6, cover; 7, holster; 701, auxiliary plate; 702, clamping plate; 8, accommodating chamber; 901, filter. DETAILED DESCRIPTION

[0036] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0037] See also Figure 1-Figure 12As shown, the present invention provides a circulating liquid-cooled charging gun, comprising a charging pile outer cover 1 and a charging gun 3, wherein the charging gun 3 is arranged on one side of the outside of the charging pile outer cover 1, and a gun holster 7 for supporting the charging gun 3 is fixed to the outside of the charging pile outer cover 1, and the charging gun 3 is fixed by the gun holster 7, so that the charging gun 3 can be quickly removed for use during charging, a cable housing 2 is connected to the bottom of the charging gun 3, a cooling unit 4 is arranged on one side of the bottom of the charging pile outer cover 1, and a supporting tube 5 connected to the cooling unit 4 is arranged at the bottom of the cable housing 2, and the supporting tube 5 is a hard insulating tube;

[0038] The cable housing 2 is a flexible insulating tube vertically connecting the charging gun 3 and the support tube 5. The charging gun 3 includes a shell 301 with a cooling cavity 301a in the middle. A hollow cooling cavity 301a is set inside the shell 301, and the cooling cavity 301a is used as a storage space for filling insulating oil for liquid cooling. Two groups of spirally extended cooling tubes 201 are staggered inside the cable housing 2. The top ends of the two groups of cooling tubes 201 extend into the charging gun 3 and are connected to the cooling cavity 301a, and the bottom ends of the two groups of cooling tubes 201 pass through the support tube 5. Entering the interior of the charging pile outer cover 1, the liquid inlet and outlet of the cooling unit 4 are respectively connected to the bottom ends of the two groups of cooling tubes 201. The cooling tubes 201 are flexible hoses to ensure that the internal cooling tubes 201 can bend synchronously when the cable housing 2 is bent. The two groups of cooling tubes 201 are staggered and extend in a spiral manner. An extension space for the charging wires of the charging gun 3 is formed inside the two groups of cooling tubes 201, so that the charging wires are wrapped by the cooling tubes 201, thereby increasing the contact area between the cooling tubes 201 and the internal charging wires, and further improving the heat conduction and heat dissipation effect.

[0039] As an optional embodiment, a fixed cover 202 connected to the shell is provided at the top of the cable shell 2, and insulating oil is filled inside the cooling unit 4. The cooling unit 4 includes an outer protective plate 401 fixed to one side of the bottom of the charging pile outer cover 1, and a accommodating chamber 8 for installing the cooling unit 4 is provided inside the charging pile outer cover 1. A filter screen 901 connected to the inside of the charging pile outer cover 1 is provided inside the accommodating chamber 8. The filter screen 901 is used to prevent the cooling unit 4 from sucking in impurities and affecting heat dissipation. A radiator 403 is fixed on the outer protective plate 401 inside the accommodating chamber 8. The radiator 403 includes two groups of side frames 403a arranged symmetrically in the longitudinal direction, and a serpentine-shaped heat dissipation copper tube 403b is provided between the two groups of side frames 403a. The bottom end of the heat dissipation copper tube 403b is connected to a liquid outlet pipe 405, and the top end of the heat dissipation copper tube 403b is connected to a liquid inlet pipe 404, and the liquid outlet pipe 405 and the liquid inlet pipe 404 are respectively connected to the two groups of cooling The bottom end of the tube 201 is connected, and a liquid pump for pumping insulating oil into the charging gun 3 and the cable housing 2 is provided at the junction of the liquid outlet pipe 405 and the cooling tube 201. A fan 402 is provided on the side of the radiator 403 away from the outer protective plate 401. The center of the fan 402 is level with the center of the radiator 403, ensuring that the fan 402 can blow air to the radiator 403 to assist in cooling and dissipating the insulating oil in the heat dissipation copper tube 403b. The filter 901 is a magnetic metal mesh, and the filter 901 is magnetically adhered to the inside of the accommodating chamber 8, which is convenient for removing the filter 901 for cleaning. The accommodating chamber 8 is connected to the inside of the charging pile outer cover 1 through the filter 901. There are multiple groups of waist-shaped holes on the outer protective plate 401. The outer protective plate 401 is used to protect the internal radiator 403 and the fan. The waist-shaped holes of the copper tube ensure the ventilation effect of the outer protective plate 401 while preventing external debris from entering the cooling unit 4 position;

[0040] An end cap 302 is provided at one end of the housing 301 away from the cable housing 2, and a D-shaped plug is provided on the outside of the end cap 302. The D-shaped plug includes a top plug plate 303 fixed to the outside of the end cap 302, two groups of side plug plates 304 are symmetrically provided on both sides of the bottom of the top plug plate 303, and the bottoms of the two groups of side plug plates 304 are connected to arc-shaped bottom plug plates 305, and two groups of side slide grooves 302a supporting the side plug plates 304 to slide forward and backward are symmetrically provided in the middle of the end cap 302, and a bottom slide groove 302b supporting the vertical sliding of the bottom plug plate 305 is provided on the bottom side of the middle of the end cap 302, and the side slide grooves 302a and the bottom slide grooves The side of the side plug plate 304 and the bottom plug plate 305 are fixed with a T-shaped slider that slides and matches the side slide groove 302a and the bottom slide groove 302b. The slider of the side plug plate 304 extends into the side of the shell 301 and is fixed with a longitudinal axis 304a that passes through the limiting ear 302c. The outer side of the longitudinal axis 304a is sleeved with a longitudinal spring 304b that tightens the limiting ear 302c. The slider of the bottom plug plate 305 extends into the side of the shell 301 and is fixed with a vertical axis 305a that passes through the limiting ear 302c. The outer side of the vertical axis 305a is sleeved with a vertical spring 304b that tightens the limiting ear 302c. The vertical spring 305b of the ear 302c is provided inside the housing 301 along its length direction. A rectangular frame synchronization frame 306 is slidably arranged. The cross section of the synchronization frame 306 is wedge-shaped, and the synchronization frame 306 can push the slider to support the side plug plate 304 and the bottom plug plate 305 to gather together. Further, the wedge-shaped synchronization frame 306 is used to push the side plug plate 304 and the bottom plug plate 305 to gather together, thereby reducing the overall size of the D-shaped plug, making it easier for the charging gun 3 to be inserted into or removed from the vehicle charging port, and improving the difficulty of plugging and unplugging caused by the deformation of the charging plug or the charging port due to long-term use. A U-shaped transmission rod 307 is fixed to the side of the synchronization frame 306 away from the end cover 302, a rectangular frame-shaped containing frame 309 is provided at the bottom of the housing 301, a handle 308 is provided inside the containing frame 309, a transmission groove 308b for accommodating the transmission rod 307 is provided at the top of the handle 308, a circular rotating seat 308a is provided in the middle of the handle 308, a rotating support rod 309a penetrating the rotating seat 308a to support the rotation of the handle 308 is fixed in the middle of the containing frame 309, and multiple groups of arc-shaped gripping grooves that fit the fingers are provided on both sides of the handle 308 to improve the grip comfort and stability;

[0041] The front and rear sides of the outer shell 301 are both provided with clamping grooves 301b. The holster 7 includes an auxiliary plate 701 fixed to the outside of the charging pile outer cover 1. The outside of the auxiliary plate 701 is provided with a C-shaped clamping plate 702 with an opening facing outward to clamp the clamping groove 301b on the outside of the charging gun 3. The clamping plate 702 is made of deformable engineering plastic material to ensure that the charging gun 3 can extend into the clamping plate 702 from the opening of the clamping plate 702 to complete the clamping action.

[0042] With the above structure, when the vehicle needs to be charged, the user holds the housing 301 of the charging gun 3 and grasps the handle 308, and supports the rotation of the handle 308 by rotating the support rod 309a, so that the transmission groove 308b at the top of the handle 308 pushes the transmission rod 307 to drive the synchronization frame 306 to move toward the end cover 302, thereby pushing the side plug plate 304 and the bottom plug plate 305 to slide along the side slide groove 302a and the bottom slide groove 302b respectively through the synchronization frame 306 with a wedge-shaped cross-section, and at the same time, the longitudinal spring 304b and the vertical spring 305b are compressed synchronously, and the bottom and both sides of the D-shaped plug composed of the top plug plate 303, the bottom plug plate 305 and the two groups of side plug plates 304 are synchronously contracted inwardly, thereby realizing the overall thinning action of the D-shaped plug. At this time, the operator inserts the charging gun 3 into the charging port of the vehicle and releases the handle 308, and uses the vertical spring 305b and the longitudinal spring 304b to push the top plug plate 303 and the bottom plug plate 305 ... The bottom plug plate 305 and the side plug plate 304 are pushed back to their original positions, and the D-shaped plug is restored to its original shape as a whole, so as to ensure that the plug of the charging gun 3 can maintain stability after being inserted into the vehicle charging port. At the same time, when the charging gun 3 needs to be unplugged from the vehicle charging port, the operator holds the charging gun 3 and grasps the handle 308, and operates according to the above steps, so as to reduce the overall size of the D-shaped plug, so as to facilitate the quick separation of the charging gun 3 from the charging port. During the charging process, the insulating oil in the cooling unit 4 is introduced into a group of cooling pipes 201 through a liquid pump connected to the liquid outlet pipe 405, and then the insulating oil is guided to circulate and cool along the cable housing 2 and the outer shell 301 of the charging gun 3 through two groups of cooling pipes 201 serving as upper and lower liquid pipes, respectively. When the charging gun 3 is idle, the liquid pump is not in operation, and the insulating oil in the cooling chamber 301a and the cooling pipe 201 flows back to the cooling unit 4, so as to ensure the portability of taking the charging gun 3 during the next charging process.

[0043] By arranging two groups of cross-distributed and spirally extending cooling pipes 201 inside the cable housing 2, and filling the cooling unit 4 with insulating oil as a cooling medium, when the cable heats up during charging, the insulating oil is introduced into the cooling pipe 201 and the cooling cavity 301a by a liquid pump to cooperate with the cooling unit 4 to form a cooling circuit, so that the insulating oil in the charging gun 3 and the cooling pipe 201, which are at a higher position when not charging, is returned to the cooling unit 4, thereby reducing the weight of the charging gun 3 and the charging cable, and improving the convenience of personnel in taking and operating the charging gun 3 and pulling the charging cable;

[0044] The two groups of spirally extended cooling pipes 201 are used as the upper liquid pipe and the lower liquid pipe respectively, which prolongs the running time of the cooling medium inside the cable housing 2, thereby improving the cooling effect of the insulating oil on the internal heating cable and ensuring the cooling quality;

[0045] At the same time, the plug of the charging gun 3 is set to a movable structure, and the thickness of the plug can be changed, so that when the charging gun 3 is plugged in and out of the vehicle charging port, the plug can be automatically contracted and thinned by holding the handle 308, so as to improve the difficulty of plugging and unplugging the existing plug caused by ensuring tight plugging during the charging process, and further improve the convenience of operation.

[0046] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A circulating liquid-cooled charging gun, characterized in that: The charging pile housing (1) comprises a charging gun (3), wherein the charging gun (3) is arranged on one side of the outside of the charging pile housing (1), and a gun holster (7) for supporting the charging gun (3) is fixed to the outside of the charging pile housing (1), the bottom of the charging gun (3) is connected to a cable housing (2), a cooling unit (4) is arranged on one side of the bottom of the charging pile housing (1), and a supporting tube (5) connected to the cooling unit (4) is arranged at the bottom of the cable housing (2); The cable housing (2) is a vertically penetrating flexible insulating tube, the charging gun (3) comprises a shell (301) with a cooling cavity (301a) arranged in the middle, two groups of spirally extending cooling tubes (201) are arranged in an alternating manner inside the cable housing (2), the top ends of the two groups of cooling tubes (201) extend into the interior of the charging gun (3) and are connected to the cooling cavity (301a), and the bottom ends of the two groups of cooling tubes (201) penetrate into the interior of the charging pile outer cover (1) along the support tube (5), and the liquid inlet and liquid outlet of the cooling unit (4) are respectively connected to the bottom ends of the two groups of cooling tubes (201); The top of the cable housing (2) is provided with a fixed cover (202) connected to the housing, the cooling unit (4) is filled with insulating oil, the cooling unit (4) comprises an outer protective plate (401) fixed to one side of the bottom of the charging pile outer cover (1), and the charging pile outer cover (1) is provided with a receiving cavity (8) for installing the cooling unit (4); A filter (901) connected to the interior of the charging pile outer cover (1) is arranged inside the accommodating cavity (8); a radiator (403) is fixed on the outer protective plate (401) inside the accommodating cavity (8); the radiator (403) comprises two groups of side frames (403a) arranged symmetrically in the longitudinal direction; a serpentine-shaped extending heat dissipation copper tube (403b) is arranged between the two groups of side frames (403a); The bottom end of the heat dissipation copper tube (403b) is connected to a liquid outlet tube (405), and the top end of the heat dissipation copper tube (403b) is connected to a liquid inlet tube (404); the liquid outlet tube (405) and the liquid inlet tube (404) are respectively connected to the bottom ends of two groups of cooling tubes (201), and a liquid pump for pumping insulating oil into the charging gun (3) is provided at the junction of the liquid outlet tube (405) and the cooling tube (201); A fan (402) is arranged on one side of the radiator (403) away from the outer protective plate (401), the center of the fan (402) is horizontal with the center of the radiator (403), the filter (901) is a magnetic metal mesh, and the filter (901) is magnetically attached to the inside of the accommodating cavity (8), the accommodating cavity (8) is connected to the inside of the charging pile outer cover (1) through the filter (901), and the outer protective plate (401) is densely covered with multiple groups of waist-shaped holes; An end cover (302) is provided at one end of the housing (301) away from the cable housing (2), a D-shaped plug is provided on the outside of the end cover (302), the D-shaped plug comprises a top plug plate (303) fixed to the outside of the end cover (302), two groups of side plug plates (304) are symmetrically provided on both sides of the bottom of the top plug plate (303), and the bottoms of the two groups of side plug plates (304) are connected to an arc-shaped bottom plug plate (305), two groups of side slide grooves (302a) supporting the side plug plates (304) to slide forward and backward are symmetrically provided in the middle of the end cover (302), and a bottom slide groove (302b) supporting the bottom plug plate (305) to slide vertically is provided on the bottom side of the middle of the end cover (302).

2. According to claim 1, a circulating liquid-cooled charging gun, characterized in that: The side slide groove (302a) and the bottom slide groove (302b) extending into the housing (301) are both fixed with a limiting ear (302c), and the side edges of the side plug plate (304) and the bottom plug plate (305) are both fixed with a T-shaped slider that slidably matches the side slide groove (302a) and the bottom slide groove (302b), and the slider of the side plug plate (304) extending into the housing (301) is fixed with a longitudinal axis (304a) that passes through the limiting ear (302c), and the outer side of the longitudinal axis (304a) is sleeved with a longitudinal spring (304b) that presses against the limiting ear (302c).

3. According to claim 2, a circulating liquid-cooled charging gun is characterized in that: The slider of the bottom plug plate (305) extends into one side of the housing (301) and is fixed with a vertical shaft (305a) penetrating a limiting ear (302c); a vertical spring (305b) for tightening the limiting ear (302c) is sleeved on the outside of the vertical shaft (305a); a rectangular frame synchronizing frame (306) is slidably arranged inside the housing (301) along its length direction; the synchronizing frame (306) has a wedge-shaped cross section, and the synchronizing frame (306) is capable of pushing the slider to support the side plug plate (304) and the bottom plug plate (305) to gather together.

4. According to claim 3, a circulating liquid-cooled charging gun is characterized in that: A U-shaped transmission rod (307) is fixed to the side of the synchronization frame (306) away from the end cover (302); a rectangular frame-shaped accommodating frame (309) is arranged at the bottom of the housing (301); a handle (308) is arranged inside the accommodating frame (309); a transmission groove (308b) for accommodating the U-shaped transmission rod (307) is arranged at the top of the handle (308); a circular ring-shaped rotating seat (308a) is arranged in the middle of the handle (308); and a rotating support rod (309a) penetrating the circular ring-shaped rotating seat (308a) to support the rotation of the handle (308) is fixed in the middle of the accommodating frame (309).

5. According to claim 1, a circulating liquid-cooled charging gun is characterized in that: The outer front and rear sides of the housing (301) are both provided with clamping grooves (301b); the holster (7) comprises an auxiliary plate (701) fixed to the outside of the charging pile outer cover (1); and the outside of the auxiliary plate (701) is provided with a C-shaped clamping plate (702) with an opening facing outwards for clamping the clamping groove (301b) on the outside of the charging gun (3).

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