Auxiliary gate shell, auxiliary gate unit and uncovered refueling device

Abstract

The utility model relates to the technical field of automobile refueling devices, and provides an auxiliary gate shell, an auxiliary gate unit and an uncovered refueling device.The auxiliary gate shell comprises an auxiliary gate shell body, the auxiliary gate shell body is provided with a first inlet, a first outlet and a first cavity, and the first inlet and the first outlet are located at the two opposite ends of the first cavity respectively; the first inlet, the first chamber and the first outlet are communicated in sequence for inserting an oil gun; a water outlet and a water guide structure are further arranged on the side wall of the auxiliary gate shell, the water outlet communicates with the interior of the first cavity, the water guide structure is located on the lower side of the water outlet and used for guiding water to flow to a preset position, the water flow is prevented from overflowing or flowing to an inappropriate area, the controllability and conductibility of the water flow are improved, and the service life of the water flow is prolonged. Water flow can effectively flow to a target position, the drainage process is accelerated, the drainage efficiency is improved, the drainage time is shortened, water accumulation is effectively prevented, the adverse effect of the water flow on the structure and the surrounding environment is reduced, the structure is simple, and the manufacturing difficulty is low.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile refueling devices, in particular to an auxiliary gate housing, an auxiliary gate unit and a capless refueling device. Background Art

[0002] At present, a refueling device is usually installed on the refueling pipe of a car tank to close the refueling port. When refueling, the cover of the refueling device is opened and the refueling gun is inserted into the refueling pipe along the refueling device. Therefore, the refueling device is an indispensable component of the automobile fuel system. The auxiliary gate housing of the refueling device in the related art has a complex structure and poor water conduction performance, and there is a problem of water overflow or flowing to inappropriate areas. Utility Model Content

[0003] The utility model provides an auxiliary gate housing, which is used to solve the problems of complicated structure, poor water guiding performance and water overflow or improper flow areas of the auxiliary gate housing of a refueling device in the related art.

[0004] The utility model provides a secondary gate housing, comprising:

[0005] A secondary gate housing, wherein the secondary gate housing is provided with a first inlet, a first outlet and a first chamber, wherein the first inlet and the first outlet are respectively located at opposite ends of the first chamber, and the first inlet, the first chamber and the first outlet are sequentially connected to each other for inserting a refueling gun;

[0006] Among them, a drain port and a water guiding structure are also provided on the side wall of the auxiliary gate housing. The drain port is connected to the interior of the first chamber. The water guiding structure is located at the lower side of the drain port. The water guiding structure is used to guide water to flow to a preset position.

[0007] According to an auxiliary gate housing provided by the utility model, the water guide structure is a water guide boss convexly arranged on the side wall of the auxiliary gate housing, and the water guide boss is located outside the first chamber.

[0008] According to the auxiliary gate housing provided by the utility model, the width of the water guide boss is greater than the width of the drain port.

[0009] According to an auxiliary gate housing provided by the utility model, the upper side wall of the water guiding boss is provided with a guiding inclined surface for guiding water.

[0010] According to an auxiliary gate housing provided by the utility model, the auxiliary gate housing is provided with a plurality of buckle structures, and the plurality of buckle structures surround the side wall of the auxiliary gate circumferentially and are arranged at intervals.

[0011] According to the auxiliary gate housing provided by the utility model, a plurality of the buckle structures are symmetrically arranged.

[0012] According to a secondary gate housing provided by the utility model, the buckle structure includes a buckle slot provided in the secondary gate housing and a buckle protrusion located in the buckle slot, the lower end of the buckle protrusion in the length direction is connected to the bottom of the slot, the upper end of the buckle protrusion in the length direction is spaced apart from the upper wall of the slot, and the opposite side walls of the buckle protrusion in the width direction are spaced apart from the opposite side walls of the slot in the width direction;

[0013] Wherein, both opposite side walls in the width direction of the slot are provided with slot slopes, and both opposite side walls in the width direction of the buckle protrusion are provided with buckle slopes, and the slot slopes in the width direction of the slot are arranged parallel to the buckle slopes of the buckle protrusion.

[0014] According to an auxiliary gate housing provided by the utility model, the end wall of the auxiliary gate housing is provided with a guiding slope, and the guiding slope is arranged around the first inlet.

[0015] The utility model also provides a secondary gate unit, comprising:

[0016] The auxiliary gate housing mentioned above;

[0017] A gate assembly, used to open or close the first inlet, the gate assembly is fixedly arranged inside the first chamber, and a part of the structure of the gate assembly is fixedly matched with the auxiliary gate housing;

[0018] The fueling gun guide rail is used to guide the movement of the fueling gun. The fueling gun guide rail is fixedly arranged inside the first chamber. The fueling gun guide rail is located on one side of the gate assembly. Part of the structure of the fueling gun guide rail is fixedly matched with the auxiliary gate housing.

[0019] The utility model also provides a capless refueling device, comprising:

[0020] The auxiliary gate unit mentioned above;

[0021] A main cover unit, the main cover unit is fixedly matched with the auxiliary gate unit, the main cover unit has a second inlet, a second outlet and a second chamber, the second inlet and the second outlet are respectively located at opposite ends of the second chamber, the first inlet, the second chamber and the second outlet are sequentially connected to guide the refueling gun to be inserted for refueling and limit the insertion stroke of the refueling gun;

[0022] Wherein, the first outlet and the second inlet are butt-jointed and connected.

[0023] The auxiliary gate housing provided by the utility model adopts the above-mentioned structure. The design of the water guide structure helps to guide the water body to flow from the bottom of the drain outlet to the preset position, prevents the water from overflowing or flowing to an inappropriate area, and improves the controllability and diversion of the water flow; it can make the water flow effectively to the target position, accelerate the drainage process, improve the drainage efficiency, thereby reducing the drainage time, and can also effectively prevent water accumulation, reduce the adverse effects of the water flow on the structure and the surrounding environment, the structure is simple, and the manufacturing difficulty is relatively low. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 This is a schematic diagram of the structure of the auxiliary gate housing provided by the utility model from a first perspective;

[0026] Figure 2 It is a second perspective structural schematic diagram of the auxiliary gate housing provided by the utility model;

[0027] Figure 3 It is a structural schematic diagram of the coverless refueling device provided by the utility model;

[0028] Figure 4 It is a cross-sectional schematic diagram of a capless refueling device provided by the utility model.

[0029] Reference numerals:

[0030] 100, auxiliary gate housing; 110, first chamber; 120, drain outlet; 140, first matching part; 150, second matching part; 160, fixing structure; 170, water guide structure; 171, guide slope; 180, buckle structure; 181, slot; 182, buckle protrusion; 190, guide slope; 200, gate assembly; 300, fuel gun guide rail; 310, drain channel; 400, blocking mechanism; 600, main cover housing; 610, main cover channel; 700, deflector; 710, diversion channel; 800, valve structure. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] Combine the following Figure 1-Figure 4 The utility model is described with respect to an auxiliary gate housing, an auxiliary gate unit and a capless refueling device. The capless refueling device comprises an auxiliary gate unit and a main cover unit.

[0033] Reference Figures 1 to 4 According to the utility model, a secondary gate housing is provided, including: a secondary gate housing 100, the secondary gate housing 100 is provided with a first inlet, a first outlet and a first chamber 110, the first inlet and the first outlet are respectively located at opposite ends of the first chamber 110, the first inlet, the first chamber 110 and the first outlet are connected in sequence for inserting a refueling gun; wherein, a drain port 120 and a water guide structure 170 are also provided on the side wall of the secondary gate housing 100, the drain port 120 is connected with the inside of the first chamber 110, the water guide structure 170 is located at the lower side of the drain port 120, and the water guide structure 170 is used to guide water to flow to a preset position.

[0034] The auxiliary gate housing provided by the utility model adopts the above-mentioned structure. The design of the water-guiding structure 170 helps to guide the water body to flow from the bottom of the drain outlet 120 to the preset position, prevents the water from overflowing or flowing to inappropriate areas, and improves the controllability and diversion of the water flow; it can make the water flow effectively to the target position, accelerate the drainage process, improve the drainage efficiency, thereby reducing the drainage time, and can also effectively prevent water accumulation, reduce the adverse effects of the water flow on the structure and the surrounding environment, the structure is simple, and the manufacturing difficulty is relatively low.

[0035] It is understandable that, referring to Figures 1 to 4 In the embodiment of the utility model, the water guiding structure 170 is a water guiding boss protruding from the side wall of the auxiliary gate housing 100, and the water guiding boss is located outside the first chamber 110. The design of the water guiding boss can effectively guide water flow, reduce resistance and prevent water accumulation, thereby improving the efficiency and reliability of the drainage system.

[0036] Specifically, refer to Figures 1 to 4 In the embodiment of the utility model, the width of the water guide boss is greater than the width of the drain port 120, which improves the drainage capacity and stability and ensures the normal operation and efficiency of the drainage system.

[0037] Specifically, refer to Figures 1 to 4In the embodiment of the utility model, the upper side wall of the water guide boss is provided with a guide slope 171 for guiding the water body. The guide slope 171 can reduce the splashing phenomenon of the water flow during the flow process, and can also accelerate the flow speed of the water flow, so that the water flow can be drained faster, thereby improving the drainage efficiency of the drainage system.

[0038] Specifically, refer to Figures 1 to 4 In the embodiment of the utility model, the auxiliary gate housing 100 is provided with a plurality of snap-fit ​​structures 180, and the plurality of snap-fit ​​structures 180 surround the side wall of the auxiliary gate housing 100 and are arranged at intervals. During assembly, the auxiliary gate housing 100 is installed on the vehicle body near the fuel tank through the snap-fit ​​structure 180, thereby enhancing the stability and firmness of the overall structure. It can be understood that in the embodiment of the utility model, the plurality of snap-fit ​​structures 180 are symmetrically arranged, so that the forces received are more evenly distributed, reducing the situation of excessive local forces, which is beneficial to extending the service life of the auxiliary gate housing. It should be noted that, referring to Figures 1 to 4 In the embodiment of the utility model, the auxiliary gate housing 100 is a symmetrical structure, and a plurality of snap structures 180 are symmetrically distributed on opposite sides of the auxiliary gate housing 100 with respect to the center line of the water-conducting structure 170, which helps to balance the force and maintain the overall stability of the structure, and facilitates the manufacture of the auxiliary gate housing 100.

[0039] Specifically, refer to Figures 1 to 4In the embodiment of the utility model, the buckle structure 180 includes a buckle slot 181 provided in the auxiliary gate housing 100 and a buckle protrusion 182 located in the buckle slot 181, the lower end of the buckle protrusion 182 in the length direction is connected to the bottom of the slot 181, the upper end of the buckle protrusion 182 in the length direction is spaced apart from the upper wall of the slot 181, and the opposite side walls of the buckle protrusion 182 in the width direction are spaced apart from the opposite side walls of the slot 181 in the width direction; wherein, the opposite side walls in the width direction of the slot 181 are both provided with a buckle inclined surface, and the opposite side walls in the width direction of the buckle protrusion 182 are both provided with a buckle inclined surface, and the buckle inclined surface of the slot 181 in the width direction of the slot 181 is parallel to the buckle inclined surface of the buckle protrusion 182. With the above arrangement, the snap structure 180 is composed of a snap slot 181 and a snap protrusion 182, and the corresponding vehicle body is equipped with a corresponding snap-fit ​​structure, which can extend into the snap slot 181 and snap-fit ​​with the snap protrusion 182, providing a stable connection method to ensure the fixation between the auxiliary gate housing 100 and the vehicle body; the inclined surface of the slot 181 and the snap bevel can reduce the resistance and friction that may be encountered during installation and disassembly, making the loading and unloading process smoother; in addition, due to the interval setting between the slot 181 and the snap protrusion 182, a certain elastic space is allowed, which can help absorb slight deformations caused by temperature changes or other external factors, reduce the risk of stress concentration, and better disperse force when subjected to vibration or impact, reduce the risk of looseness or damage between the auxiliary gate housing 100 and the vehicle body, and enhance durability.

[0040] Specifically, refer to Figures 1 to 4 In the embodiment of the utility model, the end wall of the auxiliary gate housing 100 is provided with a guiding slope 190, and the guiding slope 190 is arranged around the first inlet. Through the above structure, the design of the guiding slope 190 arranged around the first inlet can effectively guide the insertion of the refueling gun, improve the insertion accuracy, the convenience of operation, and reduce the possible damage risk, thereby optimizing the efficiency and safety of the refueling operation.

[0041] It is understandable that, referring to Figures 1 to 4 In the embodiment of the utility model, the main cover unit is fixedly matched with the auxiliary gate unit, and the main cover unit has a second inlet, a second outlet, and a second chamber. The second inlet and the second outlet are respectively located at opposite ends of the second chamber, and the first inlet, the second chamber, and the second outlet are sequentially connected to guide the refueling gun to be inserted for refueling and limit the insertion stroke of the refueling gun; wherein the first outlet is docked and connected with the second inlet. Through the above structure, through a series of connected inlets and outlets, the refueling gun is guided to be inserted and its insertion stroke is limited, while ensuring the flow of the refueling medium.

[0042] Specifically, refer to Figures 1 to 4In the embodiment of the utility model, the auxiliary gate unit further includes a gate assembly 200 and a refueling gun guide rail 300. The gate assembly 200 is used to open or close the first inlet. The gate assembly 200 is fixedly arranged inside the first chamber 110. Part of the structure of the gate assembly 200 is fixedly matched with the auxiliary gate housing 100. The refueling gun guide rail 300 is used to guide the movement of the refueling gun. The refueling gun guide rail 300 is fixedly arranged inside the first chamber 110. The refueling gun guide rail 300 is located on one side of the gate assembly 200. Part of the structure of the refueling gun guide rail 300 It is fixedly matched with the auxiliary gate housing 100; in a first direction, one end of the gate assembly 200 abuts against an inner wall of one end of the first chamber 110, and the other end of the gate assembly 200 abuts against an end of the fuel gun guide rail 300; wherein, when the gate assembly 200 is subjected to the pushing force of the fuel gun, the first inlet is opened, and the opening direction of the gate assembly 200 is toward the location of the first outlet; after the gate assembly 200 is out of contact with the fuel gun, the first inlet is closed, and the closing direction of the gate assembly 200 is toward the location of the first inlet.

[0043] It should be noted that the gate assembly 200 has a fixed end and a closed portion, the fixed end is mounted on the auxiliary gate housing 100, and the closed portion is used to close the first inlet.

[0044] Through the above structure, there is no need to unscrew the auxiliary gate unit when refueling. The refueling gun can be directly inserted and the gate assembly 200 can be pushed by the refueling gun to open the first inlet, so that the refueling gun can be inserted into the first chamber 110, the gate assembly 200 and the refueling gun guide rail 300 to realize the refueling operation. Through the above structure, the operation of opening and closing the fuel filler cap is omitted when refueling, and the first inlet can only be opened when the gate assembly 200 is subjected to the push force of the fuel gun, and the door opening direction is toward the position of the first outlet; the first inlet can only be closed after the gate assembly 200 is out of contact with the fuel gun, and the door closing direction is toward the position of the first inlet. The above gate assembly 200 is a single-door structure to prevent water and dust from entering, and can ensure that the door is tightly closed in the non-refueling state, thereby achieving waterproof and dustproof, saving time and effort, and avoiding the situation of leaking; at the same time, when the fuel gun is inserted, the first chamber 110, the gate assembly 200 and the fuel gun guide rail 300 are sequentially abutted and matched, thereby improving the stability of the gate assembly 200, thereby improving the stability and reliability of the entire auxiliary gate unit.

[0045] It is also understandable that, with reference to Figures 1 to 4In the embodiment of the utility model, a plurality of first positioning parts are provided on the fixed end of the gate assembly 200, and the plurality of first positioning parts are arranged at intervals around the outer wall of the gate assembly 200, and the first positioning parts arrange the gate assembly 200 along the first direction. Specifically, the outer wall of the fixed end of the gate assembly 200 is provided with a first positioning part, and the inner wall of the first chamber 110 of the auxiliary gate housing 100 is provided with a first matching part 140, and the first matching part 140 is engaged with the first positioning part to limit the circumferential rotation of the gate assembly 200 relative to the first chamber 110. It can be understood that the first positioning portion is an anti-rotation groove, and the first matching portion 140 is an anti-rotation rib, which ensures that the gate assembly 200 can remain stable in the correct position, thereby facilitating the normal operation of the auxiliary gate unit; the anti-rotation groove is extended along the length direction, and the anti-rotation rib is arranged on the gate assembly 200 along the length direction. They correspond one to one and are snap-fitted together, which can increase the contact area between the gate assembly 200 and the auxiliary gate housing 100, improve the overall stability of the auxiliary gate unit, and enhance the connection.

[0046] It should be noted that, refer to Figures 1 to 4 In the embodiment of the utility model, specifically, at least one fixed structure 160 is provided on the auxiliary gate housing 100, and at least one elastic locking structure is provided on the outer side wall of the fuel gun guide rail 300. The elastic locking structure extends radially. Under the action of external force, the elastic locking structure has a tendency to fit together with the outer side wall of the fuel gun guide rail 300; wherein, the elastic locking structure corresponds to the fixed structure 160 to limit the rotation of the fuel gun guide rail 300 relative to the auxiliary gate housing 100.

[0047] With the above structure, by setting an elastic retaining structure on the outer side wall of the fuel gun guide rail 300, additional positioning support can be provided when the fuel gun is inserted, so that the fuel gun can maintain a stable position during the insertion process, which helps to reduce the operator's error and ensure that the fuel gun can be accurately inserted into the auxiliary gate housing 100; the radial extension design of the elastic retaining structure can provide circumferential support during the insertion of the fuel gun, reducing the swing or offset of the fuel gun in the fuel gun guide rail 300. It helps to ensure stability and safety during the refueling process; at the same time, the elastic retaining structure and the fixed structure 160 can be used to limit the rotation of the fuel gun guide rail 300 relative to the auxiliary gate housing 100. It can ensure that the fuel gun guide rail 300 maintains a fixed position and direction during use, prevents accidental rotation or movement, and improves the accuracy and safety of operation.

[0048] It should also be noted that, referring to Figures 1 to 4In an embodiment of the utility model, the fueling gun guide rail 300 is provided with a drainage channel 310, and the drainage channel 310 is connected to the drainage port 120. The above-mentioned auxiliary gate unit also includes a blocking mechanism 400, which is arranged on the fueling gun guide rail 300. The blocking mechanism 400 has a blocking state and an open state; wherein the blocking mechanism 400 in the open state can open the drainage channel 310; the blocking mechanism 400 can be switched from the open state to the blocking state under the action of external force to block the drainage channel 310. Through the specially designed drain port 120 and drain channel 310, a small amount of water flowing in from the gap between the auxiliary gate housing 100 and the gate assembly 200 can be discharged from the drain port 120, avoiding the decrease in the sealing performance of the auxiliary gate unit and the partial damage of the main cover unit caused by the insertion of the refueling gun after freezing; and because there are certain sealing requirements for the auxiliary gate unit and the entire capless refueling device during refueling, a sealing mechanism 400 is provided to seal the drain channel 310 and the drain port 120, so as to achieve sealed refueling while also being able to cope with steam reflux type refueling guns.

[0049] It should also be noted that, referring to Figure 1 and Figure 2 In the embodiment of the utility model, the main cover unit includes: a main cover shell 600, the main cover unit is provided with a main cover channel 610; a flow guide 700, the flow guide 700 is connected to the main cover shell 600, the flow guide 700 is provided with a flow guide channel 710, the flow guide channel 710 is connected to the main cover channel 610 to form a second chamber; a valve structure 800, used to open or close the main cover channel 610, and the valve structure 800 can be automatically opened and pressure relief, the valve structure 800 and the main cover shell 600 can be The valve structure 800 is rotatably connected and is located inside the main cover channel 610. The valve structure 800 rotates relative to the main cover shell 600 to open or close the main cover channel 610. The port of the main cover channel 610 cooperates with the valve structure 800 to form a two-way valve. When the pressure in the second chamber is greater than a preset threshold, the valve structure 800 automatically opens and relieves pressure in the second chamber, and the direction of pressure relief of the valve structure 800 is opposite to the direction in which the valve structure 800 opens the main cover channel 610.

[0050] With the above structure, the main cover housing 600 and the deflector 700 constitute the main structure of the main cover unit, which can effectively isolate and protect the main cover channel 610 and internal components to prevent the influence of the external environment and the intrusion of substances; the main cover channel 610 is opened and closed by the valve structure 800, and the pressure is automatically released when necessary to ensure that the pressure in the second chamber is within a safe range. When the pressure exceeds the preset threshold, that is, when the internal pressure of the fuel tank is abnormal, the valve structure 800 is opened, and the valve structure 800 will automatically open to release the pressure to prevent the fuel tank from being damaged, so as to protect safe operation.

[0051] It should be noted that the second inlet is an opening at one end of the main cover channel 610 of the main cover shell 600, and the second outlet is an opening at the other end opposite to the guide channel 710 of the guide device 700.

[0052] It can be understood that in the embodiment of the utility model, the overall assembly process of the above-mentioned capless refueling device is as follows: during installation, the main cover unit and the auxiliary gate unit are both installed at the refueling port of the automobile, the auxiliary gate unit cover is arranged on part of the structure of the main cover unit, the main cover unit is inserted into the refueling pipe of the fuel tank, and the auxiliary gate unit cover is installed on the body of the automobile.

[0053] It should be noted that the above reference Figure 1 and Figure 2 A guide groove is provided in the first chamber 110 of the auxiliary gate housing 100 of the auxiliary gate unit, and a guide protrusion is provided in the main cover housing 600 of the main cover unit, and the guide protrusion cooperates with the guide groove to assemble the auxiliary gate housing 100 and the main cover housing 600.

[0054] It can be understood that in the embodiment of the utility model, the use process of the above-mentioned capless refueling device is as follows: the refueling gun pushes the gate assembly 200 to open the first inlet of the auxiliary gate unit, and the refueling gun passes through the gate assembly 200 and the refueling gun guide rail 300 in sequence. Then, the refueling gun pushes the valve structure 800 to open the second inlet, and the refueling gun is inserted into the main cover channel 610 of the main cover shell 600 and the guide channel 710 of the guide device 700, and then refueling is carried out.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A secondary gate housing, characterized in that: include: A secondary gate housing (100), the secondary gate housing (100) being provided with a first inlet, a first outlet and a first chamber (110), the first inlet and the first outlet being respectively located at opposite ends of the first chamber (110), the first inlet, the first chamber (110) and the first outlet being sequentially connected for inserting a refueling gun; A drain port (120) and a water guide structure (170) are also provided on the side wall of the auxiliary gate housing (100); the drain port (120) is communicated with the interior of the first chamber (110); the water guide structure (170) is located at the lower side of the drain port (120); and the water guide structure (170) is used to guide water to flow to a preset position.

2. The auxiliary gate housing according to claim 1, characterized in that: The water guide structure (170) is a water guide boss protruding from the side wall of the auxiliary gate housing (100), and the water guide boss is located outside the first chamber (110).

3. The auxiliary gate housing according to claim 2, characterized in that: The width of the water-guiding boss is greater than the width of the drainage port (120).

4. The auxiliary gate housing according to claim 2, characterized in that: The upper side wall of the water-guiding boss is provided with a guiding inclined surface (171) for guiding water.

5. The auxiliary gate housing according to claim 2, characterized in that: The auxiliary gate housing (100) is provided with a plurality of buckle structures (180), and the plurality of buckle structures (180) surround the side wall of the auxiliary gate and are arranged at intervals.

6. The auxiliary gate housing according to claim 5, characterized in that: The plurality of snap structures (180) are symmetrically arranged.

7. The auxiliary gate housing according to claim 5, characterized in that: The buckle structure (180) comprises a buckle slot (181) provided in the auxiliary gate housing (100) and a buckle protrusion (182) located in the buckle slot (181); the lower end of the buckle protrusion (182) in the length direction is connected to the bottom of the buckle slot (181); the upper end of the buckle protrusion (182) in the length direction is spaced apart from the upper wall of the buckle slot (181); and the opposite side walls of the buckle protrusion (182) in the width direction are spaced apart from the opposite side walls of the buckle slot (181) in the width direction. Wherein, both opposite side walls in the width direction of the clamping slot (181) are provided with a clamping slot (181) inclined surface, and both opposite side walls in the width direction of the buckle protrusion (182) are provided with a buckle inclined surface, and the clamping slot (181) inclined surface in the width direction of the clamping slot (181) is arranged parallel to the buckle inclined surface of the buckle protrusion (182).

8. The auxiliary gate housing according to claim 1, characterized in that: The end wall of the auxiliary gate housing (100) is provided with a guide slope (190), and the guide slope (190) is arranged around the first inlet.

9. A secondary gate unit, characterized in that: include: The auxiliary gate housing according to any one of claims 1 to 8; a gate assembly (200) for opening or closing the first inlet, the gate assembly (200) being fixedly disposed inside the first chamber (110), and a part of the structure of the gate assembly (200) being fixedly matched with the auxiliary gate housing (100); The fueling gun guide rail (300) is used to guide the movement of the fueling gun. The fueling gun guide rail (300) is fixedly arranged inside the first chamber (110). The fueling gun guide rail (300) is located on one side of the gate assembly (200). Part of the structure of the fueling gun guide rail (300) is fixedly matched with the auxiliary gate housing (100).

10. A capless refueling device, characterized in that: include: The auxiliary gate unit as claimed in claim 9; A main cover unit, the main cover unit is fixedly matched with the auxiliary gate unit, the main cover unit has a second inlet, a second outlet and a second chamber, the second inlet and the second outlet are respectively located at opposite ends of the second chamber, the first inlet, the second chamber and the second outlet are sequentially connected to guide the refueling gun to be inserted for refueling and limit the insertion stroke of the refueling gun; Wherein, the first outlet and the second inlet are butt-jointed and connected.

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