A DC charging pile with air-cooling and liquid-cooling combined cooling method

Abstract

The present invention relates to the technical field of DC charging piles, specifically to a DC charging pile with a combined cooling method of air cooling and liquid cooling, including a DC charging pile body, wherein the inner walls on both sides of the DC charging pile body are respectively provided with threading holes, a charging gun cable is installed inside the threading holes, the output end of the charging gun cable is connected to the charging gun head, and the access end of the charging gun cable is connected to the cable terminal. By adopting a combination of a liquid cooling mechanism and an air cooling mechanism, combined cooling of heat at the connection between the charging gun cable and the cable terminal is achieved, and by cooperating with the air supply pipe and the pipe sleeve assembly, the cold air can be delivered and cooled at a fixed point at the connection, and the liquid cooling protective cover and the DC charging pile body are covered, meeting the combination of liquid cooling and air cooling, and also meeting the stability of the installation of the liquid cooling protective cover and the charging gun cable, reducing the wear and safety hazards of the charging gun cable caused by the shaking of the liquid cooling protective cover.

Description

Technical Field

[0001] The present invention relates to the technical field of direct current charging piles, and in particular to a direct current charging pile with a combined cooling method of air cooling and liquid cooling. Background Art

[0002] With the popularization of electric vehicles and the continuous development of fast charging technology, the current and power density that charging piles have to bear are getting higher and higher, which leads to a significant increase in the heat generated by charging piles during the charging process. In order to ensure the stable operation of charging piles and extend their service life, heat dissipation technology has become a key link in the design of charging piles.

[0003] In the prior art, there is a liquid-cooled and air-cooled integrated charging cable charging pile with publication number CN118238651B, which includes a charging pile body, a panel is rotatably connected to one side of the charging pile body, two slides are fixedly connected in the charging pile body, an adjustment slot is provided in the slide, a storage plate for loading battery packs and electrical components is fastened in the adjustment slot, and a plate rack is provided in the charging pile body. The wind plate can be controlled to rise and fall vertically and move back and forth by starting the lifting drive member, and the cold air delivered to the wind plate by the air outlet hose and the guide of the air guide can be blown to the heated battery pack and electrical components to reduce their temperature. At the same time, the oil cooling hose is arranged inside the charging cable to cool it down during charging, thereby improving the cooling effect of the charging pile when used in summer and extending the service life of the electric vehicle charging pile and the electrical components inside it.

[0004] Even if the inside of the charging pile is fully cooled, in actual use, heat is easily accumulated at the location where the cable sheath covers the multi-core wires, and it is difficult to dissipate the heat quickly at this location. This is mainly because heat is generated when current passes through the cable. Although the cable sheath has certain insulation and heat dissipation functions, in the case of high-power charging or long-term use, high temperature accumulates at the connection location between the cable and the electronic components, making it difficult to dissipate heat quickly, thereby affecting the use effect of the DC charging pile and the charging efficiency, and may still face the problem of insufficient heat dissipation.

[0005] Therefore, the present invention proposes a DC charging pile with a combined air-cooling and liquid-cooling cooling method to solve the problem that high temperature accumulates at the connection position between the charging cable and the electronic components of the existing DC charging pile and is difficult to dissipate quickly. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention aims to provide a DC charging pile with a combined cooling method of air cooling and liquid cooling to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a DC charging pile with a combined cooling method of air cooling and liquid cooling, comprising a DC charging pile body, the inner walls on both sides of the DC charging pile body are respectively provided with threading holes, a charging gun cable is installed inside the threading holes, the output end of the charging gun cable is connected to a charging gun head, the access end of the charging gun cable is connected to a cable terminal, a liquid cooling mechanism is arranged on the outside of one end of the charging gun cable close to the cable terminal, and the liquid cooling mechanism comprises a liquid cooling protective sleeve, a joint ring, a terminal crimping piece, a lock A fastener and a cold liquid connector, a wire groove is arranged on the inner wall of the back end of the DC charging pile body, a mounting back plate is arranged on the inner side of the wire groove, an air cooling mechanism is arranged on the wire groove and the mounting back plate, the air cooling mechanism comprises an air cooler, an air storage pipe, an air supply pipe and a pipe socket assembly, a sealing tight fitting assembly is arranged on the outer surface of the air supply pipe, the pipe socket assembly comprises an annular socket cylinder and a threaded connection cylinder, the two ends of the annular socket cylinder are respectively movably connected to the outer surface of the liquid cooling protective sleeve, and an auxiliary contact piece is arranged on the inner side of the annular socket cylinder.

[0008] Preferably, the mounting back plate is detachably mounted on the inner wall of the back end of the DC charging pile body by bolts, an air cooler is fixedly mounted on the outer surface of the mounting back plate, an air outlet end of the air cooler is sealed with an air guide pipe, the other end of the air guide pipe is through-connected to the inner wall of the lower end of the air storage pipe, and the air storage pipe is arranged on the inner side of the wire threading groove.

[0009] Preferably, the air storage pipe has a hollow cylindrical structure, and end pipe cone blocks are fixedly installed on the inner walls at both ends of the air storage pipe respectively. The end pipe cone blocks have a cone structure, and two groups of end pipe cone blocks are mirror-distributed about the vertical center axis of the air storage pipe.

[0010] Preferably, air supply holes are evenly opened on the inner wall of the air storage pipe, spacers are fixedly installed on the inner ring side wall of the air storage pipe, the spacers are horizontally equidistantly staggered, and one side inner wall of the air storage pipe is sealed and connected to the air supply pipe.

[0011] Preferably, the sealing tight-fitting assembly includes a threaded sleeve, a self-tightening ring and a self-tightening nut, the threaded sleeve is fixedly mounted on the outer surface of the air supply pipe, the self-tightening ring is fixedly mounted on one side of the threaded sleeve, reserved grooves are evenly arranged on the self-tightening ring, a soft contact block is directly arranged on the inner ring surface of the self-tightening ring and the outer surface of the air supply pipe, the outer surface of the self-tightening ring is threadably adapted to the inner surface of the self-tightening nut, and a thumb groove is arranged on the outer surface of the self-tightening nut.

[0012] Preferably, the outer surface of the threaded connection cylinder is threadedly connected to the inner surface of the threaded sleeve, one end of the threaded connection cylinder is fixedly connected to the annular sleeve cylinder body, the annular sleeve cylinder body and the threaded connection cylinder are respectively provided with two groups and the two are combined to form a cylinder body, an annular grid plate is fixedly provided on the outer ring side wall of the annular sleeve cylinder body, and a wind shield arc plate is fixedly installed on the inner wall of the annular grid plate away from the threaded connection cylinder.

[0013] Preferably, the inner side of the upper end of the connector ring is fixedly connected to the outer ring surface of the terminal crimping piece, the central inner surface of the terminal crimping piece is crimped to the outer surface of the cable terminal, and the inner outer ring sleeve of the terminal crimping piece is provided with a sealing ring 1, and the outer surface of the sealing ring 1 is movably connected to the inner ring surface of the connector ring.

[0014] Preferably, the locking piece is movably mounted on the inner side of the joint ring, a thread groove is designed on the inner wall of the joint ring, the inner surface of the thread groove is adapted to the upper outer thread of the locking piece, and the inner cavity of the joint ring is configured as a buffer cavity and a retention cavity.

[0015] Preferably, the inner annular surface of the locking piece is movably connected to the outer surface of the charging gun cable, and a sealing ring 2 is provided on the outer surface fixed sleeve of the locking piece, and the outer surface of the sealing ring 2 is movably abutted against the inner surface of the liquid cooling protective sleeve, and liquid flow holes are provided on the inner wall of the upper end of the liquid cooling protective sleeve, and the liquid flow holes are arranged in multiple groups and arranged in a circular array about the central axis of the liquid cooling protective sleeve, and the liquid flow holes are interconnected with the buffer cavity, and an annular groove is provided on the upper inner wall of the locking piece, and the annular groove is mutually interconnected with the buffer cavity and the retention cavity respectively.

[0016] Preferably, the cold liquid connecting head is arranged on the outer surface of the joint ring, the lower end of the cold liquid connecting head is sealed and connected with the cold liquid inlet pipe, the inner side of the cold liquid connecting head is threadedly connected with a countersunk bolt, a guide hole is opened on the inner wall of the countersunk bolt, and the inner end of the countersunk bolt passes through the inner wall of the joint ring and is threadedly connected thereto.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention proposes a DC charging pile with a combined air-cooling and liquid-cooling cooling method, which realizes combined cooling of heat at the connection between the charging gun cable and the cable terminal by combining a liquid cooling mechanism with an air cooling mechanism. The air supply pipe cooperates with the connecting pipe sleeve assembly to not only carry out fixed-point delivery and cooling of the cold air at the connection, but also plays a covering role for the liquid cooling protective cover and the DC charging pile body, thereby meeting the combination of liquid cooling and air cooling, and meeting the stability of the installation of the liquid cooling protective cover and the charging gun cable, reducing the wear and safety hazards of the charging gun cable caused by the shaking of the liquid cooling protective cover, and further solving the problem that high temperature accumulation is difficult to quickly dissipate at the connection position between the charging cable and the electronic components of the existing DC charging pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the front three-dimensional structure of the DC charging pile body of the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of the DC charging pile body of the present invention in an open state;

[0021] Figure 3 It is a schematic diagram of the back three-dimensional structure of the DC charging pile body of the present invention;

[0022] Figure 4 This is a schematic diagram of the overall structure of the present invention without the DC charging pile body;

[0023] Figure 5 It is a schematic diagram of the connection structure between the liquid cooling mechanism and the air cooling mechanism of the present invention;

[0024] Figure 6 It is a structural schematic diagram of the air cooling mechanism of the present invention;

[0025] Figure 7 It is a schematic diagram of a half-section structure of the connection between the pipe sleeve assembly and the air supply pipe of the present invention;

[0026] Figure 8 For the present invention Figure 7 A schematic diagram of the enlarged structure at point A;

[0027] Fig. 9 It is a schematic diagram of the disassembled structure of the pipe socket assembly and the charging gun cable of the present invention;

[0028] Fig.10 For the present invention Fig. 9 A schematic diagram of the enlarged structure at B;

[0029] Fig.11 For the present invention Fig. 9 A schematic diagram of the enlarged structure at C;

[0030] Fig.12 For the present invention Fig. 9A schematic diagram of the structure at D of FIG.

[0031] Fig.13 It is a half-section structural schematic diagram of the liquid cooling mechanism of the present invention;

[0032] Fig.14 For the present invention Fig.13 A schematic diagram of the structure at E of FIG.

[0033] Fig.15 For the present invention Fig.13 Schematic diagram of the structure at F;

[0034] Fig.16 It is a schematic diagram of the partial cross-sectional structure of the liquid cooling mechanism of the present invention.

[0035] In the figure: 1. DC charging pile body; 10. Threading hole; 11. Charging gun cable; 111. Cable terminal; 12. Charging gun head; 2. Liquid cooling protective sleeve; 20. Liquid flow hole; 21. Connector ring; 200. Buffer chamber; 210. Retention chamber; 22. Terminal crimping piece; 221. Sealing ring 1; 23. Locking piece; 231. Sealing ring 2; 230. Annular groove; 24. Cold liquid connector; 241. Cold liquid inlet pipe; 242. Countersunk bolt; 2420. Guide hole; 3. Threading groove; 4. Install back plate; 31. Cooling fan; 32. Air guide pipe; 33. Air storage pipe; 330. Delivery pipe Air hole; 331, end pipe cone block; 332, spacer; 34, air supply pipe; 341, threaded sleeve; 342, self-tightening collar; 3420, reserved groove; 3421, soft contact block; 343, self-tightening nut; 3431, thumb groove; 35, pipe sleeve assembly; 351, annular sleeve cylinder; 3511, threaded connection cylinder; 352, annular grid plate; 353, wind shield arc plate; 350, limiting arc groove; 3501, limiting pipe; 3502, slider; 3503, curved elastic wire; 3504, hinge block one; 3505, connecting rod; 3506, hinge block two; 3507, deformation touch plate. DETAILED DESCRIPTION

[0036] In order to make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, not all of them, and are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] For example, see Figure 1-16The present invention provides a technical solution: a DC charging pile with a combined cooling method of air cooling and liquid cooling, comprising a DC charging pile body 1, threading holes 10 are respectively opened on the inner walls on both sides of the DC charging pile body 1, a charging gun cable 11 is installed inside the threading hole 10, the output end of the charging gun cable 11 is connected to a charging gun head 12, the access end of the charging gun cable 11 is connected to a cable terminal 111, and a liquid cooling mechanism is arranged on the outside of one end of the charging gun cable 11 close to the cable terminal 111, the liquid cooling mechanism comprises a liquid cooling protective sleeve 2, a joint ring 21, a terminal crimping piece 22, a locking piece 23 and a cold liquid connector 24, a threading groove 3 is arranged on the inner wall of the back end of the DC charging pile body 1, an installation back plate 4 is arranged on the inner side of the threading groove 3, an air cooling mechanism is arranged on the threading groove 3 and the installation back plate 4, the air cooling mechanism comprises a cooling fan 31, an air storage pipe 33, an air supply pipe 34 and a pipe socket assembly 35, and a sealing The tight-fitting component, the pipe sleeve component 35 includes an annular sleeve cylinder 351 and a threaded connection cylinder 3511. The two ends of the annular sleeve cylinder 351 are respectively movably connected to the outer surface of the liquid cooling protection sleeve 2, and an auxiliary contact piece is arranged on the inner side of the annular sleeve cylinder 351. By combining the liquid cooling mechanism with the air cooling mechanism, the combined cooling of the heat at the connection between the charging gun cable 11 and the cable terminal 111 is realized. The air supply pipe 34 cooperates with the pipe sleeve component 35, which can not only carry out fixed-point delivery and cooling of the connection at the cold air, but also play a covering role for the liquid cooling protection sleeve 2 and the DC charging pile body 1, satisfying the combination of liquid cooling and air cooling, but also satisfying the stability of the installation of the liquid cooling protection sleeve 2 and the charging gun cable 11, reducing the wear and safety hazards of the charging gun cable 11 caused by the shaking of the liquid cooling protection sleeve 2, and further solving the problem that high temperature accumulation is difficult to dissipate quickly at the connection position between the existing DC charging pile charging cable and the electronic components.

[0038] Embodiment 2, refer to the attached Figure 1-16On the basis of the first embodiment, in order to realize the liquid circulation at the connection between the charging gun cable 11 and the cable terminal 111, the generated heat is dissipated: the inner side of the upper end of the joint ring 21 is fixedly connected to the outer ring surface of the terminal crimping piece 22, the central inner surface of the terminal crimping piece 22 is crimped to the outer surface of the cable terminal 111, and the inner outer ring sleeve of the terminal crimping piece 22 is provided with a sealing ring 221, and the outer surface of the sealing ring 221 is movably connected to the inner ring surface of the joint ring 21; the locking piece 23 is movably installed on the inner side of the joint ring 21, and a thread groove is designed on the inner wall of the joint ring 21, and the inner surface of the thread groove is adapted to the upper outer thread of the locking piece 23, and the inner cavity of the joint ring 21 is set as a buffer cavity 200 and a retention cavity 210; the inner ring surface of the locking piece 23 is movably connected to the outer surface of the charging gun cable 11, and the outer surface of the locking piece 23 is movably connected to the outer surface of the charging gun cable 11. A sealing ring 231 is provided on the surface fixing sleeve, and the outer surface of the sealing ring 231 is movably abutted against the inner surface of the liquid-cooling protective sleeve 2. A liquid flow hole 20 is provided on the inner wall of the upper end of the liquid-cooling protective sleeve 2. The liquid flow holes 20 are arranged in multiple groups and are arranged in a circular array about the central axis of the liquid-cooling protective sleeve 2. The liquid flow holes 20 and the buffer chamber 200 are interconnected. An annular groove 230 is provided on the upper inner wall of the locking member 23, and the annular groove 230 is respectively interconnected with the buffer chamber 200 and the retention chamber 210; a cold liquid connector 24 is provided on the outer surface of the joint collar 21, and a cold liquid inlet pipe 241 is sealed and connected to the lower end of the cold liquid connector 24. A countersunk bolt 242 is threadedly connected to the inner side of the cold liquid connector 24. A guide hole 2420 is provided on the inner wall of the countersunk bolt 242, and one inner end of the countersunk bolt 242 passes through the inner wall of the joint collar 21 and is threadedly connected thereto;

[0039] In this embodiment, before installing the air cooling mechanism, the liquid cooling protective sleeve 2 is installed on the outside of the charging gun cable 11, and liquid cooling mechanisms are respectively arranged at both ends of the liquid cooling protective sleeve 2 to realize the liquid cooling circulation of the cavity between the liquid cooling protective sleeve 2 and the outside of the charging gun cable 11, so as to take away the heat generated by charging. Specifically, refer to Figure 12-16As shown, the cable terminal 111 is crimped with the terminal crimping piece 22, and the charging gun cable 11 is connected to the terminal crimping piece 22. At this time, the joint ring 21 is sleeved on the outside of the liquid cooling protective sleeve 2. Before the terminal crimping piece 22 is connected to the joint ring 21, the locking piece 23 is first inserted from the upper end of the joint ring 21, and the locking piece 23 is adapted to be connected with the inner ring surface of the joint ring 21, and the inner cavity of the joint ring 21 is divided into two annular spaces, the buffer cavity 200 and the retention cavity 210. When the cold liquid inlet pipe 241 at one end is connected to the external cold liquid source, the cold liquid inlet pipe 241 passes through the cold liquid inlet pipe 241. The coolant is guided into the retention chamber 210 through the guide hole 2420, and enters the buffer chamber 200 through the annular groove 230 opened on the upper inner wall of the locking piece 23. Then the coolant enters the cavity formed by the liquid cooling protective sleeve 2 and the charging gun cable 11 through the evenly distributed liquid flow holes 20. It should be noted that two sets of connector rings 21 are respectively connected to both ends of the liquid cooling protective sleeve 2. The two sets of structures are the same, and only the liquid cooling mechanism at the connection end of the charging gun cable 11 and the cable terminal 111 is shown. At this time, the cold liquid inlet pipe 241 can be used as a cooling liquid inlet pipe or as a cooling liquid outlet pipe.

[0040] Embodiment 3, refer to the attached Figure 1-16 On the basis of the second embodiment, in order to realize the convenient installation of the air cooling mechanism: the mounting back plate 4 is detachably mounted on the inner wall of the back end of the DC charging pile body 1 by bolts, and the outer surface of the mounting back plate 4 is fixedly mounted with an air cooler 31, and the air outlet end of the air cooler 31 is sealed and connected with an air guide pipe 32, and the other end of the air guide pipe 32 is connected through the inner wall of the lower end of the air storage pipe 33, and the air storage pipe 33 is arranged on the inner side of the threading groove 3; the air storage pipe 33 is a hollow cylindrical structure, and end pipe cone blocks 331 are fixedly mounted on the inner walls of both ends of the air storage pipe 33, respectively, and the end pipe cone blocks 331 are cone-shaped structures, and the two groups of end pipe cone blocks 331 are mirror-imaged about the vertical center axis of the air storage pipe 33; air supply holes 330 are evenly opened on the inner wall of the air storage pipe 33, and spacers 332 are fixedly mounted on the inner ring side wall of the air storage pipe 33, and the spacers 332 are horizontally equidistantly staggered, and the inner wall of one side of the air storage pipe 33 is sealed and connected with the air supply pipe 34;

[0041] In this embodiment, refer to Figure 4-Figure 6As shown, a wire groove 3 is installed on the inner side of the DC charging pile body 1, which can not only accommodate the lines between the electronic components inside the DC charging pile body 1, but also realize the placement of the air storage pipe 33. By installing the back plate 4, it can be disassembled from the back side of the DC charging pile body 1, which is convenient for the wiring or maintenance of the lines inside the wire groove 3; when the air cooling work is performed at the connection between the charging gun cable 11 and the cable terminal 111, the air cooler 31 is turned on, and the cold air enters the air storage pipe 33 through the air guide main pipe 32 for buffering. At this time, part of the cold air passes through the air supply holes evenly opened on the air storage pipe 33. 330 output, can cool down the wire groove 3 and the inner line to prevent heat accumulation, and part of the cold air is transmitted through two sets of air supply pipes 34 into the connection between the DC charging pile body 1 and the cable terminal 111 surrounded by the pipe socket assembly 35, to achieve combined cooling at the connection position between the charging gun cable 11 and the electronic components; it is worth noting that evenly staggered spacers 332 are arranged inside the air storage pipe 33, which can combine external impurities and moisture to avoid corrosion of the internal components of the charging pile, extend the service life, and will not affect the normal transmission effect of cold air.

[0042] Embodiment 4, refer to the attached Figure 1-16 On the basis of the third embodiment, in order to achieve the tightness of the connection between the butt joint sleeve assembly 35 and the air supply pipe 34: the sealing tight fitting assembly includes a threaded sleeve 341, a self-tightening ring 342 and a self-tightening nut 343, the threaded sleeve 341 is fixedly installed on the outer surface of the air supply pipe 34, the self-tightening ring 342 is fixedly installed on one side of the threaded sleeve 341, and reserved grooves 3420 are evenly opened on the self-tightening ring 342. The inner ring surface of the self-tightening ring 342 and the outer surface of the air supply pipe 34 are directly provided with a soft contact block 3421, and the outer surface of the self-tightening ring 342 and the self-tightening nut 343 are connected. The inner surface is threadedly adapted, and a thumb groove 3431 is provided on the outer surface of the self-tightening nut 343; the outer surface of the threaded connection tube 3511 is threadedly connected to the inner surface of the threaded sleeve 341, and one end of the threaded connection tube 3511 is fixedly connected to the annular sleeve cylinder 351, and the annular sleeve cylinder 351 and the threaded connection tube 3511 are respectively provided with two groups and the two are combined to form a cylinder, and an annular grid plate 352 is fixedly added on the outer ring side wall of the annular sleeve cylinder 351, and a windshield arc plate 353 is fixedly installed on the inner wall of the annular grid plate 352 away from the threaded connection tube 3511;

[0043] In this embodiment, two groups of relatively distributed annular sleeve cylinders 351 form a complete cylinder to cover the outside of the liquid cooling protection sleeve 2. At this time, the two groups of threaded connection cylinders 3511 are synchronously combined and adapted to the inner surface threads of the threaded sleeve 341. To ensure the tightness of the connection, a self-tightening collar 342 is connected to one end of the threaded sleeve 341 and fastened by a self-tightening nut 343. Here, the soft contact block 3421 increases the tightness of the assembly and does not cause wear on the surface of the air supply pipe 34. It is worth noting that in the annular sleeve A wind shield arc plate 353 is additionally provided on the inner side of the connecting cylinder body 351. When cold air is transported through the air supply pipe 34, the cold air blows toward the surface of the liquid cooling protective sleeve 2, taking away the heat that has not been completely dissipated by the liquid cooling cycle. The inner curved wind shield arc plate 353 can block and guide the blowing cold air, thereby extending the time that the cold air stays inside the annular sleeve connecting cylinder body 351, thereby further improving the cooling effect of the connection position between the charging gun cable 11 and the cable terminal 111, and finally conducting the accumulated heat outward through the annular mesh plate 352.

[0044] Embodiment 5, refer to the attached Figure 1-16 On the basis of the fourth embodiment, in order to realize the auxiliary clamping of the liquid cooling protective sleeve 2 and the charging gun cable 11, the present embodiment adds an auxiliary contact piece: the inner annular surfaces at both ends of the pipe sleeve assembly 35 are respectively provided with a limiting arc groove 350, the auxiliary contact piece is arranged on the inner side of the limiting arc groove 350, and the auxiliary contact piece includes a limiting tube 3501 and a deformation contact plate 3507, the two ends of the limiting tube 3501 are respectively fixedly connected to the inner walls of the two sides of the limiting arc groove 350, and the outer surface of the limiting tube 3501 is slidably connected with a slider 3502, and the slider The outer side of 3502 is fixedly connected with a curved elastic wire 3503, the other end of the curved elastic wire 3503 is fixedly connected with the inner wall of the limiting arc groove 350, the outer surface of the slider 3502 is rotatably connected with a hinge block 1 3504, the outer surface of the hinge block 1 3504 is fixedly connected with a connecting rod 3505, the other end of the connecting rod 3505 is rotatably connected with a hinge block 2 3506, the hinge block 2 3506 is fixedly installed on the outer surface of the deformation touch plate 3507, and the inner surface of the deformation touch plate 3507 is in active contact with the outer surface of the liquid cooling protective sleeve 2;

[0045] In this embodiment, when the two groups of annular sleeve cylinders 351 cover the liquid cooling protection sleeve 2, the deformation touch plates 3507 at both ends of the annular sleeve cylinder 351 are in contact with the surface of the liquid cooling protection sleeve 2. At this time, the deformation touch plates 3507 are pushed by the inner side to drive the two groups of connecting rods 3505 to open at an angle, and the slider 3502 moves inside the limiting arc groove 350. The curved elastic wire 3503 is compressed and deformed. After the assembly is completed, the reverse elastic force of the curved elastic wire 3503 provides a tightening force to the deformation touch plate 3507. , to ensure the tight clamping of the liquid cooling protective sleeve 2, the reason why the auxiliary contact parts are added on the inner side of the annular sleeve cylinder 351, combined with the combined cooling of the interface between the liquid cooling protective sleeve 2 and the charging gun cable 11, ensure that when the pipe sleeve assembly 35 is sleeved on the outside of the liquid cooling protective sleeve 2, it can not only meet the auxiliary clamping at the interface, but also play a certain clamping role, prevent the cable and the liquid cooling protective sleeve 2 from slipping, help maintain the stability of the charging gun cable 11, and can also reduce the wear and safety hazards caused by the shaking of the charging gun cable 11.

[0046] Embodiment 6, refer to the attached Figure 1-16 On the basis of the fifth embodiment, the present invention further provides a method for using a DC charging pile with a combined air-cooling and liquid-cooling cooling method, comprising the following steps:

[0047] Step 1: First, before charging, install the liquid cooling mechanism and the air cooling mechanism at the connection position. Before installing the air cooling mechanism, install the liquid cooling mechanism in advance, install the liquid cooling protective sleeve 2 on the outside of the charging gun cable 11, and set liquid cooling mechanisms at both ends of the liquid cooling protective sleeve 2 to realize the liquid cooling circulation of the cavity between the liquid cooling protective sleeve 2 and the outside of the charging gun cable 11, so as to take away the heat generated by charging.

[0048] Step 2, crimping between the cable terminal 111 and the terminal crimping piece 22, the charging gun cable 11 is connected to the terminal crimping piece 22, at this time, the joint ring 21 is sleeved on the outside of the liquid cooling protective sleeve 2, before the terminal crimping piece 22 is connected to the joint ring 21, firstly, the locking piece 23 is inserted from the upper end of the joint ring 21, and the locking piece 23 is adapted to be connected with the inner ring surface of the joint ring 21, and the inner cavity of the joint ring 21 is divided into two annular spaces, the buffer cavity 200 and the retention cavity 210. When the cold liquid inlet pipe 241 at one end is connected to the external cold liquid source, the cold liquid is guided into the retention cavity 210 through the cold liquid inlet pipe 241 and the guide hole 2420, and enters the buffer cavity 200 through the annular groove 230 opened on the upper inner wall of the locking piece 23, and then the coolant enters the cavity formed by the liquid cooling protective sleeve 2 and the charging gun cable 11 through the evenly distributed liquid flow holes 20;

[0049] Step 3: When the air cooling is performed at the connection between the charging gun cable 11 and the cable terminal 111, the air cooler 31 is turned on, and the cold air enters the air storage pipe 33 through the air guide pipe 32 for buffering. At this time, part of the cold air is output through the air supply holes 330 evenly opened on the air storage pipe 33, which can cool the threading groove 3 and the inner line to prevent heat accumulation, while part of the cold air is transmitted through the two sets of air supply pipes 34 into the connection between the DC charging pile body 1 and the cable terminal 111 surrounded by the pipe socket assembly 35, so as to realize the combined cooling at the connection position between the charging gun cable 11 and the electronic components;

[0050] Step 4: Two sets of relatively distributed annular sleeve cylinders 351 form a complete cylinder to cover the outside of the liquid cooling protection sleeve 2. At this time, the two sets of threaded connection cylinders 3511 are synchronously combined and adapted to the inner surface threads of the threaded sleeve 341. To ensure the tightness of the connection, a self-tightening collar 342 is connected to one end of the threaded sleeve 341 and fastened by a self-tightening nut 343. Here, the soft contact block 3421 increases the tightness of the assembly without causing wear on the surface of the air supply pipe 34. It should be noted that a wind shield arc plate 353 is additionally provided on the inner side of the annular sleeve cylinder 351. When the cold air is transported through the air supply pipe 34, the cold air blows toward the surface of the liquid cooling protective sleeve 2, taking away the heat that has not been completely dissipated by the liquid cooling cycle. The inner curved wind shield arc plate 353 here can block and guide the blowing cold wind, thereby extending the time that the cold air stays inside the annular sleeve cylinder 351, thereby further improving the cooling effect of the connection position between the charging gun cable 11 and the cable terminal 111.

[0051] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A DC charging pile with a combined cooling method of air cooling and liquid cooling, comprising a DC charging pile body (1), wherein the inner walls on both sides of the DC charging pile body (1) are respectively provided with threading holes (10), a charging gun cable (11) is installed inside the threading hole (10), the output end of the charging gun cable (11) is connected to a charging gun head (12), and the input end of the charging gun cable (11) is connected to a cable terminal (111), characterized in that: A liquid cooling mechanism is provided on the outside of one end of the charging gun cable (11) close to the cable terminal (111), and the liquid cooling mechanism comprises a liquid cooling protective sleeve (2), a connector ring (21), a terminal crimping piece (22), a locking piece (23) and a cooling liquid connector (24); a wire threading groove (3) is provided on the inner wall of the back end of the DC charging pile body (1); a mounting back plate (4) is provided on the inner side of the wire threading groove (3); and an air cooling mechanism is provided on the wire threading groove (3) and the mounting back plate (4). The air cooling mechanism comprises an air cooler (31), an air storage pipe (33), an air supply pipe (34) and a pipe connection assembly (35); the outer surface of the air supply pipe (34) is provided with a sealing tight-fitting assembly; the pipe connection assembly (35) comprises an annular connection cylinder (351) and a threaded connection cylinder (3511); the two ends of the annular connection cylinder (351) are respectively movably connected to the outer surface of the liquid cooling protection sleeve (2); and the inner side of the annular connection cylinder (351) is provided with an auxiliary contact piece; The sealing tight-fitting assembly comprises a threaded sleeve (341), a self-tightening collar (342) and a self-tightening nut (343); the threaded sleeve (341) is fixedly mounted on the outer surface of the air supply pipe (34); the outer surface of the threaded connection tube (3511) is threadedly connected to the inner surface of the threaded sleeve (341); one end of the threaded connection tube (3511) is fixedly connected to an annular sleeve cylinder (351); the annular sleeve cylinder (351) and the threaded connection tube (3511) are respectively provided with two groups and the two are combined to form a cylinder; an annular grid plate (352) is fixedly provided on the outer ring side wall of the annular sleeve cylinder (351); a windshield arc plate (353) is fixedly mounted on the inner wall of the annular grid plate (352) away from the threaded connection tube (3511); limiting arc grooves (350) are respectively provided on the inner ring surfaces of both ends of the pipe connection assembly (35), and auxiliary contact members are arranged in the limiting arc grooves The inner side of the arc groove (350) is provided with an auxiliary contact part, which includes a limit tube (3501) and a deformation contact plate (3507). The two ends of the limit tube (3501) are respectively fixedly connected to the inner walls of the limit arc groove (350) on both sides. The outer surface of the limit tube (3501) is slidably connected to a slider (3502). The outer side of the slider (3502) is fixedly connected to a curved elastic wire (3503). The other end of the curved elastic wire (3503) is fixedly connected to the inner wall of the limit arc groove (350). The outer surface of the slider (3502) is rotatably connected to an articulated block 1 (3504), the outer surface of the articulated block 1 (3504) is fixedly connected to a connecting rod (3505), the other end of the connecting rod (3505) is rotatably connected to an articulated block 2 (3506), the articulated block 2 (3506) is fixedly mounted on the outer surface of the deformation touch plate (3507), and the inner surface of the deformation touch plate (3507) is in movably contact with the outer surface of the liquid-cooling protective sleeve (2).

2. A DC charging pile with a combined air-cooling and liquid-cooling cooling method according to claim 1, characterized in that: The mounting back plate (4) is detachably mounted on the inner wall of the back end of the DC charging pile body (1) by means of bolts; an air cooler (31) is fixedly mounted on the outer surface of the mounting back plate (4); an air outlet end of the air cooler (31) is sealedly connected to an air guide pipe (32); the other end of the air guide pipe (32) is through-connected to the inner wall of the lower end of an air storage pipe (33); and the air storage pipe (33) is arranged on the inner side of the threading groove (3).

3. A DC charging pile with a combined air-cooling and liquid-cooling cooling method according to claim 2, characterized in that: The air storage pipe (33) is in the form of a hollow columnar structure, and end pipe cone blocks (331) are fixedly mounted on the inner walls at both ends of the air storage pipe (33), respectively. The end pipe cone blocks (331) are in the form of a cone structure, and two groups of the end pipe cone blocks (331) are distributed in a mirror-image manner with respect to the vertical central axis of the air storage pipe (33).

4. A DC charging pile with a combined air-cooling and liquid-cooling cooling method according to claim 3, characterized in that: The inner wall of the air storage pipe (33) is evenly provided with air supply holes (330), the inner ring side wall of the air storage pipe (33) is fixedly mounted with spacers (332), the spacers (332) are horizontally equidistantly distributed and staggered, and the inner wall of one side of the air storage pipe (33) is sealed and connected to the air supply pipe (34).

5. A DC charging pile with a combined cooling method of air cooling and liquid cooling according to claim 4, characterized in that: The self-tightening ring (342) is fixedly installed on one side of the threaded sleeve (341); reserved grooves (3420) are evenly arranged on the self-tightening ring (342); the inner ring surface of the self-tightening ring (342) and the outer surface of the air supply pipe (34) are directly provided with a soft contact block (3421); the outer surface of the self-tightening ring (342) is thread-matched with the inner surface of the self-tightening nut (343); and the outer surface of the self-tightening nut (343) is provided with a thumb groove (3431).

6. A DC charging pile with a combined air-cooling and liquid-cooling cooling method according to claim 1, characterized in that: The inner side of the upper end of the joint ring (21) is fixedly connected to the outer ring surface of the terminal crimping piece (22), the central inner surface of the terminal crimping piece (22) is crimped to the outer surface of the cable terminal (111), and the inner outer ring of the terminal crimping piece (22) is sleeved with a sealing ring (221), and the outer surface of the sealing ring (221) is movably connected to the inner ring surface of the joint ring (21).

7. A DC charging pile with a combined air-cooling and liquid-cooling cooling method according to claim 6, characterized in that: The locking piece (23) is movably mounted on the inner side of the joint ring (21); a thread groove is designed on the inner wall of the joint ring (21); the inner surface of the thread groove is adapted to the upper outer thread of the locking piece (23); and the inner cavity of the joint ring (21) is configured as a buffer cavity (200) and a retention cavity (210).

8. A DC charging pile with a combined air-cooling and liquid-cooling cooling method according to claim 7, characterized in that: The inner annular surface of the locking member (23) is movably connected to the outer surface of the charging gun cable (11); the outer surface of the locking member (23) is fixedly sleeved with a sealing ring 2 (231); the outer surface of the sealing ring 2 (231) is movably abutted against the inner surface of the liquid cooling protective sleeve (2); a liquid flow hole (20) is provided on the inner wall of the upper end of the liquid cooling protective sleeve (2); the liquid flow holes (20) are arranged in a plurality of groups and are arranged in a circular array about the central axis of the liquid cooling protective sleeve (2); the liquid flow holes (20) and the buffer cavity (200) are interconnected; an annular groove (230) is provided on the inner wall of the upper side of the locking member (23); the annular groove (230) is interconnected with the buffer cavity (200) and the retention cavity (210), respectively.

9. A DC charging pile with a combined air-cooling and liquid-cooling cooling method according to claim 7, characterized in that: The cold liquid connector (24) is arranged on the outer surface of the joint ring (21); the lower end of the cold liquid connector (24) is sealedly connected to a cold liquid inlet pipe (241); the inner side of the cold liquid connector (24) is threadedly connected to a countersunk bolt (242); a guide hole (2420) is formed through the inner wall of the countersunk bolt (242); and one inner end of the countersunk bolt (242) passes through the inner wall of the joint ring (21) and is threadedly connected thereto.

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