Charging gun head with good sealing effect

Abstract

The invention discloses a charging gun head with a good sealing effect, and relates to the technical field of charging gun heads, the charging gun head comprises a gun body, and one side of the gun body is a charging part; a charging cable electrically connected with the charging part is arranged on the gun body in a penetrating mode, and a connecting ring surrounding the charging cable is arranged on the side, away from the charging part, of the gun body. The sealing sleeve is arranged on the peripheral side of the charging cable in a sleeving mode, a connecting groove is formed in the peripheral side of the sealing sleeve, and the connecting ring is clamped into the connecting groove; the sealing connecting piece is arranged on the sealing sleeve, and the sealing sleeve and the charging cable are connected and sealed through the sealing connecting piece; and the expansion air bag is embedded in the inner wall of the peripheral side of the connecting ring, and the side, away from the connecting ring, of the expansion air bag abuts against the sealing sleeve. The sealing performance of the charging gun head can be improved.

Description

Technical Field

[0001] This application relates to the technical field of charging gun heads, and in particular to a charging gun head with good sealing performance. Background Technology

[0002] As the core interface for power transmission between electric vehicles and charging infrastructure, the charging gun plays a crucial role in the development of electric vehicles. With the rapid rise of the electric vehicle industry, the market has placed higher demands on the range and charging speed of electric vehicles. This necessitates that the charging gun not only possess efficient and stable power transmission capabilities but also accurate and reliable communication functions. Its performance directly affects the safety, stability, and convenience of electric vehicle charging, and is of great significance for promoting the popularization and application of electric vehicles.

[0003] In the past, to meet the basic functional requirements of charging gun heads, existing charging gun heads generally consisted of a charging gun housing, a gun head, a power transmission line, and a tail sealing block. The gun head was installed inside the charging gun housing, and the power transmission line passed through the housing and was electrically connected to the gun head. The tail sealing block was fitted around the outer periphery of the power transmission line and fixed to the tail of the charging gun housing by a snap-fit ​​mechanism. In actual use, the gun head was connected to a new energy vehicle, and the power transmission line could then charge the vehicle through the gun head. Simultaneously, the tail sealing block sealed the gap between the power transmission line and the tail of the charging gun head, thereby reducing the possibility of moisture entering the charging gun housing.

[0004] However, the charging gun heads at roadside charging stations are exposed to the outdoor environment for extended periods, suffering from wind and sun exposure. Furthermore, the end seals gradually age over time. When the end seals age, gaps appear between them and the charging gun housing. This allows moisture to easily enter the charging gun housing through these gaps, affecting the normal operation and lifespan of the charging gun head. Summary of the Invention

[0005] To improve the sealing performance of the charging gun head, this application provides a charging gun head with good sealing effect.

[0006] This application provides a charging gun head with good sealing performance, using the following technical solution: A charging gun head with good sealing effect includes a gun body, one side of which is a charging part; The gun body is provided with a charging cable electrically connected to the charging unit, and a connecting ring is provided on the side of the gun body away from the charging unit, which surrounds the charging cable. A sealing sleeve is fitted onto the outer periphery of the charging cable. A connecting groove is provided on the outer periphery of the sealing sleeve, and the connecting ring is inserted into the connecting groove. A sealing connector is disposed on the sealing sleeve, and the sealing sleeve and the charging cable are connected and sealed through the sealing connector. An inflatable airbag is embedded in the inner wall of the connecting ring, and the side of the inflatable airbag away from the connecting ring abuts against the sealing sleeve.

[0007] By adopting the above technical solution, the charging gun head passes through the gun body and connects the charging cable to the charging unit electrically, thus realizing the charging function; the connecting ring is inserted into the connecting groove of the sealing sleeve, which can initially fix the sealing sleeve and the gun body; the sealing sleeve and the charging cable are sealed together by the sealing connector, which can reduce the entry of water vapor into the gun body; the expansion airbag is embedded in the inner wall of the connecting ring and abuts against the sealing sleeve, further enhancing the sealing effect and reducing the possibility of water vapor entering the gun body.

[0008] Optionally, an air supply bladder is provided inside the connecting ring, and a connecting pipe is provided inside the connecting ring, with the two ends of the connecting pipe connected to the air supply bladder and the inflatable bladder, respectively. An extrusion assembly is provided inside the connecting ring. When water vapor permeates through the gap between the connecting groove wall near the charging part and the connecting ring, the extrusion assembly extrudes the air supply bag.

[0009] By adopting the above technical solution, when water vapor permeates through the gap between the connecting groove and the connecting ring, the extrusion component extrudes the air supply bladder, causing the gas inside the air supply bladder to enter the expansion bladder through the connecting pipe. This causes the expansion bladder to expand and come into closer contact with the sealing sleeve, further improving the sealing effect of the charging gun head and reducing the possibility of water vapor entering the gun body.

[0010] Optionally, the extrusion assembly includes an extrusion plate and a water-absorbing expansion ring; The water-absorbing expansion ring is embedded in the connecting ring on the side near the charging part, the extrusion plate is slidably connected in the connecting ring, one side of the extrusion plate is connected to the outer wall of the air supply bag, and the other end abuts against the water-absorbing expansion ring.

[0011] By adopting the above technical solution, when water vapor permeates into the gap between the connecting ring and the sealing sleeve, the water-absorbing expansion ring expands upon contact with water, pushing the extrusion plate. The extrusion plate then extrudes the air supply bladder, delivering the gas inside the air supply bladder to the expansion bladder through the connecting pipe. This allows the expansion bladder to further expand and press against the sealing sleeve, thereby enhancing the sealing performance of the charging gun head and effectively limiting the continued entry of water vapor into the gun body.

[0012] Optionally, the outer wall of the extrusion plate is provided with sliding teeth, and the connecting ring is provided with connecting teeth, wherein the sliding teeth mesh with the connecting teeth; When the extrusion plate extrudes the air supply bag, the sliding tooth slides on the connecting tooth; When the extrusion plate is away from the air supply bladder, the connecting tooth provides unidirectional support to the sliding tooth.

[0013] By adopting the above technical solution, when the extrusion plate extrudes the air supply bladder, the sliding teeth slide on the connecting teeth, which facilitates the smooth extrusion action; when the extrusion plate moves away from the air supply bladder, the connecting teeth can support the sliding teeth in one direction, which can limit the reverse movement of the extrusion plate, ensure stable air supply to the air supply bladder and keep the expansion bladder in a good sealing state.

[0014] Optionally, the extrusion plate includes an inner plate and an outer plate; The inner plate is slidably connected to the outer plate, the outer plate is connected to the air supply bag, and the inner plate abuts against the water absorption expansion ring; The connecting ring is provided with an elastic drive element that drives the inner plate away from the air supply bag; The inner plate is provided with one-way teeth, and the outer plate is provided with limiting teeth, the one-way teeth meshing with the limiting teeth; When the water-absorbing expansion ring squeezes the inner plate, the limiting tooth provides one-way support to the one-way tooth. When the inner plate moves away from the air supply bladder, the one-way tooth slides unidirectionally against the limiting tooth.

[0015] By adopting the above technical solution, when the water-absorbing expansion ring expands and squeezes the inner plate when it encounters water, the limiting tooth can support the unidirectional tooth in one direction, so that the inner plate pushes the outer plate to effectively squeeze the air supply bag to supply air to the expansion bag; while when the elastic drive component drives the inner plate away from the air supply bag, the unidirectional tooth can slide unidirectionally on the limiting tooth, ensuring that the inner plate is smoothly reset, further improving the sealing reliability and stability of the charging gun head.

[0016] Optionally, the elastic driving component is a driving spring, the inner plate is provided with a stop block that slides within the connecting ring, the driving spring is disposed within the connecting ring, one end of the driving spring abuts against the stop block near the air supply bag, and the other end abuts against the connecting ring.

[0017] By adopting the above technical solution, the driving spring and the stop block work together to provide the inner plate with a driving force away from the air supply bag. When the water absorption expansion ring returns to its original state, the inner plate can be smoothly reset so that the next water absorption expansion triggers the squeezing action, ensuring the long-term reliable operation of the charging gun head sealing structure.

[0018] Optionally, the connecting ring is provided with a separating soft mesh, which abuts against the side of the water-absorbing expansion ring away from the air supply bladder.

[0019] By adopting the above technical solution, the separating soft net prevents the water absorption and expansion ring from detaching from the connecting ring.

[0020] Optionally, the sealing connector is a sealing ring, and there are multiple sealing rings evenly arranged axially on the inner peripheral sidewall of the sealing sleeve; The charging cable has multiple sealing grooves evenly distributed on its outer periphery, and the sealing rings are inserted into the sealing grooves in a one-to-one correspondence.

[0021] By adopting the above technical solution, multiple sealing rings are evenly arranged on the inner circumferential sidewall of the sealing sleeve along the axial direction, and are inserted one by one into the sealing grooves evenly opened on the outer circumferential side of the charging cable. This can further enhance the sealing performance between the sealing sleeve and the charging cable, and effectively prevent moisture from entering the gun body from the gap between the two.

[0022] In summary, this application includes at least one of the following beneficial effects: 1. The connecting ring is inserted into the connecting groove of the sealing sleeve. The sealing sleeve and the charging cable are connected and sealed through the sealing connector. The expansion airbag abuts against the sealing sleeve, which can effectively prevent moisture from entering the gun body and improve the sealing effect of the charging gun head. 2. An air supply bladder, a connecting pipe, and a compression assembly are installed inside the connecting ring. When water vapor permeates, the compression assembly compresses the air supply bladder, causing the expansion bladder to expand and further enhance the sealing effect. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the external structure of an embodiment of this application; Figure 2 This is a schematic diagram of the internal cross-section of an embodiment of this application; Figure 3 yes Figure 2 Enlarged schematic diagram of part A; Figure 4 yes Figure 2 Enlarged schematic diagram of part B.

[0024] Reference numerals: 1. Gun body; 11. Charging unit; 12. Charging cable; 121. Sealing groove; 2. Connecting ring; 21. Connecting tooth; 22. Drive spring; 23. Separating mesh; 24. Receiving groove; 25. Mounting groove; 3. Sealing sleeve; 31. Connecting groove; 4. Sealing ring; 5. Inflating airbag; 6. Air supply airbag; 61. Connecting pipe; 7. Extrusion assembly; 71. Extrusion plate; 711. Sliding tooth; 712. Inner plate; 7121. One-way tooth; 7122. Stop block; 713. Outer plate; 7131. Restricting tooth; 72. Water absorption expansion ring. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0026] This application discloses a charging gun head with good sealing performance.

[0027] Example 1 See Figure 1 This application provides a charging gun head with good sealing performance, including a gun body 1. A charging unit 11 is fixedly installed on one side of the gun body 1 for charging. A charging cable 12 passes through the gun body 1, with one end electrically connected to the charging unit 11 and the other end electrically connected to a charging pile. In use, the charging unit 11 is plugged into the charging port of the new energy vehicle, and then the charging pile transmits current to the charging unit 11 through the charging cable 12 to charge the new energy vehicle.

[0028] Specifically, the gun body 1 is the main structure of the charging gun head, providing installation space and protection for internal components. The gun body 1 can be made of high-strength plastic material, such as polycarbonate, which has good insulation and impact resistance. The charging part 11 can be a structure such as a pin or socket made of conductive metal for connection to the charging interface of the new energy vehicle. For example, the charging part 11 can be a copper alloy pin, which has good conductivity. The charging cable 12 can be a multi-core cable, with each core responsible for different functions, such as power transmission and communication signal transmission. To ensure the cable's flexibility and abrasion resistance, the cable sheath can be made of rubber.

[0029] See Figure 2 and Figure 3 The charging gun head also includes a sealing sleeve 3 and a sealing connector. The sealing sleeve 3 can be made of rubber or silicone, possessing good elasticity and sealing performance. A through-hole is provided on the side of the gun body 1 away from the charging section 11, through which the charging cable 12 passes. A connecting ring 2 is fixedly connected to the gun body 1, located at the through-hole, and surrounds the charging cable 12. The sealing sleeve 3 has a hollow cylindrical structure, fitted around the outer periphery of the charging cable 12. A connecting groove 31 extending circumferentially is provided on the outer periphery of the sealing sleeve 3. The shape and size of the connecting groove 31 are adapted to the connecting ring 2. The connecting ring 2 snaps into the connecting groove 31, connecting the sealing sleeve 3 and the gun body 1. This snap-fit ​​structure enhances the tightness of the connection between the gun body 1 and the sealing sleeve 3, reducing the channels for moisture entry. During production, the gun body 1 and the connecting ring 2 are manufactured separately, and then connected and fixed to the gun body 1 by adhesive bonding or plastic welding.

[0030] A sealing connector is provided on the sealing sleeve 3 to achieve the connection between the sealing sleeve 3 and the charging cable 12 and to seal the connection. The sealing connector is a sealing ring 4, which is fixedly connected to the inner circumferential side wall of the sealing sleeve 3. There are multiple sealing rings 4, which are evenly arranged along the axial direction. Multiple sealing grooves 121 are evenly spaced on the outer circumference of the charging cable 12. Each sealing groove 121 corresponds to a sealing ring 4, and the sealing ring 4 is inserted into the sealing groove 121. The sealing ring 4 can be made of rubber, which has good elasticity and can fit tightly into the sealing groove 121, thereby effectively preventing moisture from entering. For example, the sealing ring 4 can be an O-ring, which can deform under pressure and fill the gaps in the sealing groove 121.

[0031] The charging gun head also includes an expansion airbag 5, which can be made of rubber. The expansion airbag 5 is embedded in the inner wall of the connecting ring 2, and the side of the expansion airbag 5 away from the connecting ring 2 abuts against the sealing sleeve 3, thereby improving the sealing performance of the charging gun head and reducing the entry of moisture into the gun body 1.

[0032] In use, the charging gun body 1 serves as the main body, supporting the charging unit 11 and the charging cable 12. The sealing sleeve 3 is connected to the charging gun body 1 via the connecting ring 2 and is sealed to the charging cable 12 by the sealing ring 4. Combined with the auxiliary sealing of the expansion airbag 5, a multi-layered sealing structure is formed. This combination effectively improves the sealing performance of the charging gun head, reduces the possibility of moisture entering the interior of the charging gun body 1, extends the service life of the charging gun head, and improves the safety and stability of charging.

[0033] See Figure 2 and Figure 4 Specifically, the connecting ring 2 has a mounting groove 25 extending circumferentially. The connecting ring 2 also has a supply airbag 6 installed within the mounting groove 25. The outer wall of the supply airbag 6, away from the charging part 11, is fixedly connected to the groove wall of the mounting groove 25, away from the charging part 11. The supply airbag 6 stores gas and can be made of rubber, possessing a certain degree of elasticity. A connecting tube 61 is installed and fixed within the connecting ring 2. The connecting tube 61 can be a flexible plastic tube with good flexibility and sealing properties. One end of the connecting tube 61 is fixedly connected to and communicates with the supply airbag 6, and the other end is fixedly connected to and communicates with the expansion airbag 5. In use, air from the supply airbag 6 is delivered to the expansion airbag 5 through the connecting tube 61.

[0034] A compression component 7 is provided inside the connecting ring 2. When water vapor permeates through the gap between the wall of the connecting groove 31 near the charging part 11 and the connecting ring 2, the compression component 7 compresses the air supply bag 6, causing the expansion bag 5 to expand and compress the sealing sleeve 3, reducing the possibility of water vapor permeating through the gap between the expansion bag 5 and the wall of the connecting groove 31. At the same time, when the expansion bag 5 expands, it compresses the sealing sleeve 3, which helps to improve the sealing degree between the sealing sleeve 3 and the charging cable 12.

[0035] The extrusion assembly 7 includes an extrusion plate 71 and a water-absorbing expansion ring 72. A receiving groove 24 is provided on the side of the connecting ring 2 near the charging section 11, and the receiving groove 24 is connected to the mounting groove 25. The water-absorbing expansion ring 72 is installed in the receiving groove 24. In this embodiment, the water-absorbing expansion ring 72 can be made of materials such as nitrile rubber + SAP composite material or superabsorbent polymer. The water-absorbing expansion ring 72 expands when absorbing water. A separating soft mesh 23 is fixedly installed on the connecting ring 2, and the separating soft mesh 23 abuts against the side of the water-absorbing expansion ring 72 near the charging section 11. The separating soft mesh 23 can be a mesh structure made of rubber, plastic, or other materials, used to prevent the water-absorbing expansion ring 72 from detaching from the receiving groove 24.

[0036] The extrusion plate 71 is located between the water-absorbing expansion ring 72 and the air-supplying bladder 6, and is slidably connected within the receiving groove 24. One side of the extrusion plate 71 is fixedly connected to the outer wall of the air-supplying bladder 6, and the other end abuts against the side of the water-absorbing expansion ring 72 away from the charging part 11. The extrusion plate 71 can be made of plastic or metal and has a certain degree of rigidity. When water vapor permeates through the gap between the connecting groove 31 near the charging part 11 and the connecting ring 2, the water-absorbing expansion ring 72 absorbs moisture and begins to expand, thereby extruding the extrusion plate 71. The extrusion plate 71 extrudes the air-supplying bladder 6, causing the gas inside the air-supplying bladder 6 to enter the expansion bladder 5 through the connecting pipe 61, causing the expansion bladder 5 to expand and further enhancing the sealing effect.

[0037] The outer wall of the extrusion plate 71 is fixedly connected with sliding teeth 711, and the connecting ring 2 is provided with connecting teeth 21. The connecting teeth 21 are fixedly connected to the wall of the receiving groove 24. There are multiple connecting teeth 21, which are evenly arranged, and the sliding teeth 711 and the connecting teeth 21 mesh with each other. When the extrusion plate 71 extrudes the air supply bag 6, the sliding teeth 711 slide on the connecting teeth 21; when the extrusion plate 71 moves away from the air supply bag 6, the connecting teeth 21 unidirectionally support the sliding teeth 711. This structure ensures that the extrusion plate 71 will not easily return to its original position after extruding the air supply bag 6, thus ensuring that the inflatable bag 5 remains in an inflated state and maintains a good sealing effect. The sliding teeth 711 and the connecting teeth 21 are both right-angled triangular tooth structures and are made of materials with elastic deformation, such as plastic.

[0038] The extrusion plate 71 includes an inner plate 712 and an outer plate 713. The inner plate 712 is slidably connected to the outer plate 713, and the outer plate 713 is fixedly connected to the air supply bladder 6. The inner plate 712 abuts against the water absorption expansion ring 72. The connecting ring 2 is provided with an elastic driving member to drive the inner plate 712 to slide away from the air supply bladder 6, so that when the water inside the water absorption expansion ring 72 evaporates and shrinks, the inner plate 712 can maintain the abutment state with the water absorption expansion ring 72. The elastic driving member is a driving spring 22. A one-way tooth 7121 is fixedly connected to the inner plate 712, and a limiting tooth 7131 is fixedly connected to the outer plate 713. There are multiple limiting teeth 7131, which are evenly arranged, and the one-way tooth 7121 and the limiting tooth 7131 mesh with each other. When the water-absorbing expansion ring 72 presses against the inner plate 712, the limiting tooth 7131 unidirectionally supports the unidirectional tooth 7121, allowing the inner plate 712 to transmit the compressive force to both the inner and outer plates 713, causing the outer plate 713 to compress the air supply bladder 6. When the inner plate 712 moves away from the air supply bladder 6, the unidirectional tooth 7121 slides unidirectionally against the limiting tooth 7131. The unidirectional tooth 7121 and the limiting tooth 7131 are both right-angled triangular tooth structures and are made of a material with elastic deformation, such as plastic.

[0039] The implementation principle of a charging gun head with good sealing effect in Embodiment 1 of this application is as follows: This charging gun head, through the rational combination of components such as the gun body 1, sealing sleeve 3, sealing connector, and expansion airbag 5, forms a multi-layer sealing structure. The engagement of the connecting ring 2 with the connecting groove 31, the sealing of the sealing sleeve 3 and charging cable 12 by the sealing ring 4, and the contact of the expansion airbag 5 effectively restrict the entry of moisture into the gun body 1. When moisture permeates to the vicinity of the connecting ring 2, the water-absorbing expansion ring 72 absorbs moisture and expands, squeezing the air supply airbag 6 through the extrusion assembly 7, allowing gas to enter the expansion airbag 5, further enhancing the sealing effect. At the same time, the unidirectional movement structure of the extrusion plate 71 ensures that the expansion airbag 5 can remain in an expanded state, maintaining good sealing performance. Compared with traditional charging gun heads, this design greatly improves the sealing effect, reduces the probability of failure caused by moisture ingress, and improves the service life and safety of the charging gun head, representing an effective improvement over existing technology.

[0040] Example 2 The difference between this embodiment and the previous embodiment lies in the simplification of some structures of the extrusion assembly 7. The extrusion assembly 7 still includes an extrusion plate 71 and a water-absorbing expansion ring 72, but the extrusion plate 71 is a single, integral structure, excluding the combined structure of the inner plate 712 and the outer plate 713. The outer wall of the extrusion plate 71 is provided with sliding teeth 711, and the connecting ring 2 is provided with connecting teeth 21, with the sliding teeth 711 meshing with the connecting teeth 21. When the water-absorbing expansion ring 72 absorbs moisture and expands, the extrusion plate 71 extrudes the air supply bladder 6, allowing gas to enter the expansion bladder 5. Although this structure is relatively simple, it still achieves the function of extruding the air supply bladder 6 to inflate the expansion bladder 5, thereby enhancing the sealing effect.

[0041] The implementation principle of a charging gun head with good sealing effect in Embodiment 2 of this application is as follows: The simplified extrusion assembly 7 structure reduces production costs and manufacturing difficulty while ensuring basic functions. The integrated structure of the extrusion plate 71 makes it more robust and durable, while the meshing structure of the sliding teeth 711 and the connecting teeth 21 still enables the unidirectional movement of the extrusion plate 71, ensuring the continuous expansion of the inflatable airbag 5.

[0042] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A charging gun head with good sealing effect, characterized in that: Includes a gun body (1), one side of which is a charging unit (11); The gun body (1) is provided with a charging cable (12) electrically connected to the charging part (11), and a connecting ring (2) is provided on the side of the gun body (1) away from the charging part (11) to surround the charging cable (12). A sealing sleeve (3) is fitted on the outer periphery of the charging cable (12). A connecting groove (31) is provided on the outer periphery of the sealing sleeve (3). The connecting ring (2) is inserted into the connecting groove (31). A sealing connector is provided on the sealing sleeve (3), and the sealing sleeve (3) and the charging cable (12) are connected and sealed through the sealing connector; An inflatable airbag (5) is embedded in the inner wall of the connecting ring (2), and the side of the inflatable airbag (5) away from the connecting ring (2) abuts against the sealing sleeve (3).

2. The charging gun head with good sealing effect according to claim 1, characterized in that: An air supply airbag (6) is provided inside the connecting ring (2), and a connecting tube (61) is provided inside the connecting ring (2). The two ends of the connecting tube (61) are respectively connected to the air supply airbag (6) and the inflatable airbag (5). An extrusion assembly (7) is provided inside the connecting ring (2). When water vapor permeates through the gap between the connecting groove (31) near the charging part (11) and the connecting ring (2), the extrusion assembly (7) extrudes the air supply bag (6).

3. The charging gun head with good sealing effect according to claim 2, characterized in that: The extrusion assembly (7) includes an extrusion plate (71) and a water-absorbing expansion ring (72). The water-absorbing expansion ring (72) is embedded in the connecting ring (2) on the side near the charging part (11). The extrusion plate (71) is slidably connected in the connecting ring (2). One side of the extrusion plate (71) is connected to the outer wall of the air supply bag (6), and the other end abuts against the water-absorbing expansion ring (72).

4. A charging gun head with good sealing effect according to claim 3, characterized in that: The outer wall of the extrusion plate (71) is provided with sliding teeth (711), and the inner wall of the connecting ring (2) is provided with connecting teeth (21). The sliding teeth (711) mesh with the connecting teeth (21). When the extrusion plate (71) extrudes the air supply bag (6), the sliding tooth (711) slides on the connecting tooth (21). When the extrusion plate (71) is away from the air supply bag (6), the connecting tooth (21) unidirectionally supports the sliding tooth (711).

5. A charging gun head with good sealing effect according to claim 4, characterized in that: The extrusion plate (71) includes an inner plate (712) and an outer plate (713); The inner plate (712) is slidably connected to the outer plate (713), the outer plate (713) is connected to the air supply bag (6), and the inner plate (712) abuts against the water absorption expansion ring (72); The connecting ring (2) is provided with an elastic drive member that drives the inner plate (712) away from the air supply bag (6); The inner plate (712) is provided with a one-way tooth (7121), and the outer plate (713) is provided with a limiting tooth (7131), the one-way tooth (7121) and the limiting tooth (7131) meshing with each other; When the water-absorbing expansion ring (72) squeezes the inner plate (712), the limiting tooth (7131) provides one-way support to the one-way tooth (7121). When the inner plate (712) moves away from the air supply bag (6), the one-way tooth (7121) slides unidirectionally on the limiting tooth (7131).

6. A charging gun head with good sealing effect according to claim 5, characterized in that: The elastic driving component is a driving spring (22). The inner plate (712) is provided with a stop block (7122) that slides in the connecting ring (2). The driving spring (22) is located in the connecting ring (2). One end of the driving spring (22) abuts against the stop block (7122) on the side near the air supply bag (6), and the other end abuts against the connecting ring (2).

7. A charging gun head with good sealing effect according to claim 3, characterized in that: The connecting ring (2) is provided with a separating soft mesh (23), and the separating soft mesh (23) abuts against the side of the water-absorbing expansion ring (72) away from the air supply bag (6).

8. A charging gun head with good sealing effect according to claim 1, characterized in that: The sealing connector is a sealing ring (4), and there are multiple sealing rings (4) which are evenly arranged on the inner circumferential sidewall of the sealing sleeve (3) along the axial direction; The charging cable (12) has multiple sealing grooves (121) evenly distributed on its outer periphery, and the sealing ring (4) is inserted into the sealing groove (121) in a one-to-one correspondence.

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