Connecting port structure of a reservoir cap

Abstract

A connection structure for a liquid reservoir cap includes a connection body and a limiting member. The connection body is divided into a first main body and a second main body along the direction close to the cap. The outer diameter of the second main body is larger than that of the first main body, and the second main body is used for an interference fit with a connection hole. An elastic groove is provided on the second main body, which narrows when the second main body is in an interference fit with the connection hole. This novel connection structure for a liquid reservoir cap not only has an interference fit with the connection hole, but also makes a tighter contact with the inner wall of the connection hole under the elastic force generated by elastic deformation, thereby achieving a better sealing effect, reducing the risk of paint leakage, and improving the efficiency and quality of painting operations. On the other hand, the elastic groove allows the second main body to be smoothly inserted into the connection hole without the inner wall of the connection hole scratching the outer wall of the second main body, reducing the difficulty of tight assembly and avoiding wear on the second main body during installation, which would reduce the sealing performance.

Description

Technical Field

[0001] This utility model belongs to the technical field of spray painting equipment, and in particular relates to a connection structure of a liquid reservoir cover. Background Technology

[0002] A reservoir generally refers to a paint cup, which is used to store paint. When in use, it is connected to a spray gun to spray out the paint inside.

[0003] Existing reservoir caps typically have a connection port for connecting to the mounting interface on the spray gun, thus enabling paint delivery. This connection port is generally tubular in structure and usually mates with the spray gun's mounting interface via a snap-fit ​​mechanism. While the tubular connection port design is simple and easy to manufacture, its sealing performance relies primarily on the physical contact at the connection point and a small amount of sealing material (such as rubber rings or sealant).

[0004] While existing connection structures meet the basic requirements of spray painting equipment to some extent, their insufficient sealing performance is a significant problem. Because the seal between the tubular connection and the spray gun assembly interface relies on mechanical contact and simple sealing materials, the sealing effect easily deteriorates when the equipment is used frequently or subjected to slight vibrations, leading to paint leakage from the connection. Paint leakage not only wastes resources but can also contaminate the equipment and working environment, affecting the efficiency and quality of spray painting operations. Utility Model Content

[0005] This utility model aims to at least partially solve one of the technical problems in the related art.

[0006] Therefore, according to embodiments of this disclosure, a connection port structure for a liquid reservoir cap is proposed, comprising:

[0007] The connector body is used to be inserted into the connector hole of the assembly interface; one end of the connector body is used to connect to the cover.

[0008] A limiting element is provided on the side wall of the connector body; the limiting element is used to restrict the screw-in portion of the assembly interface screwed into the side of the cover body to prevent the connector body from coming out of the connector hole.

[0009] The main body of the connection port is divided into a first main body and a second main body along the direction close to the cover; the outer diameter of the second main body is larger than the outer diameter of the first main body, and the second main body is used to make an interference fit with the connection hole;

[0010] The second main body is provided with an elastic groove, which is used to shrink and narrow when the second main body is interference-fitted with the connecting hole.

[0011] In this technical solution, the structural design incorporates an elastic groove to give the second main body a certain degree of elasticity. When inserted into the connecting hole, it not only provides an interference fit but also, under the elastic force generated by the elastic deformation, makes a tighter contact with the inner wall of the connecting hole, thus achieving a better sealing effect, reducing the risk of paint leakage, and improving the efficiency and quality of the painting operation. Furthermore, the elastic groove allows the second main body to undergo smaller elastic deformation. During the insertion of the second main body into the connecting hole, the outer diameter of the second main body can decrease slightly under the constraint of the inner wall of the connecting hole, allowing for smooth insertion without scratching the outer wall of the second main body by the inner wall of the connecting hole. This reduces the difficulty of tight assembly and avoids wear on the second main body during installation, which could reduce sealing performance.

[0012] In some embodiments, the axial length of the first main body is 3 to 12 mm; the limiting member is disposed on the second main body, and the axial distance between the limiting member and the end of the second main body near the first main body is 2 to 6 mm.

[0013] In this technical solution, the structural design ensures that the insertion part of the connector body and the connector hole has sufficient length. After the connector body is inserted into the connector hole, it can form a sufficient contact area with the inner wall of the connector hole, which enhances the firmness and sealing of the connection and reduces the risk of paint leakage caused by unstable connection. On the other hand, the reasonable control of the length of the connector body saves materials and reduces costs. It also ensures that the liquid container cap does not occupy too much space during packaging. This is of great significance for placing as many caps as possible in a limited packaging box, which helps to improve packaging efficiency, reduce transportation costs, and also helps to reduce the occupation of storage space.

[0014] In some embodiments, the end face of the second main body away from the cover is designated as a sealing surface, which is used to adhere to the stepped surface provided on the inner wall of the connecting hole.

[0015] In the technical solution, this structural design can further improve the tightness of the fit between the main body of the connection port and the connection hole of the assembly interface, making the joint between the two have a tortuous structure, providing an additional physical barrier, further increasing the difficulty of paint leakage through the joint, and further enhancing the sealing performance.

[0016] In some embodiments, the sealing surface is a conical surface whose outer diameter gradually increases toward the cover.

[0017] In the technical solution, the structural design allows the sealing surface to gradually fit against the stepped surface when the connector body is screwed into the assembly interface, providing a more uniform sealing pressure; on the other hand, the conical surface design helps guide the connector body to be correctly aligned, simplifying the installation process while ensuring the consistency of the sealing effect.

[0018] In some embodiments, the second main body is divided into a sealing part and a connecting part in sequence along the direction close to the cover; the outer diameter of the connecting part is larger than the outer diameter of the sealing part, the sealing part is used to interfere with the connecting hole, and the connecting part is used to axially attach to the end face of the assembly interface to cover the opening of the connecting hole.

[0019] In this technical solution, the structural design allows the sealing part to focus on interference fit to achieve sealing, while the connecting part is responsible for axially fitting the end face of the assembly interface, covering the opening of the connecting hole, providing double sealing protection, improving the stability and sealing performance of the overall structure, and reducing the risk of leakage due to the failure of a single sealing point.

[0020] In some embodiments, an elastic groove is disposed axially on the sealing part, and both ends of the elastic groove penetrate the sealing part.

[0021] In the technical solution, the structural design allows the reservoir to be rotated slightly during disassembly, which first connects the internal space of the connection hole to the external space through the elastic groove, eliminating the negative pressure inside the reservoir and thus eliminating the strong adhesion of the reservoir to the assembly interface, allowing the reservoir to be easily removed from the assembly interface.

[0022] In some embodiments, a venting groove is provided on the connecting part, and the venting groove is opposite to the elastic groove in the axial direction; one end of the venting groove passes through the connecting part so that the venting groove and the elastic groove are connected.

[0023] In the technical solution, the structural design eliminates the obstruction of ventilation by the connection part, so that when the liquid reservoir is rotated slightly, external air can enter the liquid reservoir through the ventilation groove and the elastic groove, eliminating the negative pressure inside the liquid reservoir, so that the liquid reservoir can be easily removed.

[0024] In some embodiments, a limiting member is disposed on the connecting portion, the surface of the limiting member away from the cover is flush with the end face of the connecting portion away from the cover, and the elastic groove is opposite to the limiting member.

[0025] In the technical solution, the structural design enables the limiting component to cover and block the elastic groove when the connection port is connected to the assembly interface, thereby further improving the sealing performance.

[0026] In some embodiments, a limiting ring is provided on the end of the second main body away from the first main body, and the limiting ring is disposed around the outer wall of the second main body; the limiting ring is used to connect the cover and restrict the movement of the assembly interface toward the cover when it is attached to the screw-on part, so that the space of the screw-on part and the limiting member on the side near the cover are opposite.

[0027] In the technical solution, the structural design can position and align the connection between the assembly interface and the main body of the connector to achieve the snap-fit ​​between the screw-on part and the limiting part, thereby improving the convenience of the liquid reservoir installation. It can also bring the assembly interface as close to the cover as possible, improving the compactness of the liquid reservoir installation on the spray gun and eliminating the impact of the large external size on the painting operation. On the other hand, the limiting ring is attached to the cover in a disc shape and connected to it, which can serve as a reinforcing structure to increase the connection strength between the cover and the main body of the connector.

[0028] In some embodiments, the limiting member has a guide surface on the side near the cover for sliding contact with the screw-in part. The guide surface is inclined so that it gradually approaches the cover along the direction in which the screw-in part is screwed in.

[0029] In the technical solution, the structural design allows for a smooth transition during the screw-in process, gradually pulling the assembly interface toward the cover. The main body of the connection is tightly pressed into the connection hole on the spray gun side, ensuring smooth installation of the liquid reservoir and improving the firmness of the connection.

[0030] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0031] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0032] Figure 1 This is a schematic diagram of the connection port structure of the liquid reservoir cover of this utility model. Figure 1 ;

[0033] Figure 2 This is a schematic diagram of the connection port structure of the liquid reservoir cover of this utility model. Figure 2 ;

[0034] Figure 3 This is a schematic diagram of the connection port structure of the liquid reservoir cover of this utility model. Figure 3 ;

[0035] Figure 4 This is a schematic diagram of the assembly interface connected to the connection port structure of the liquid reservoir cover of this utility model when it is an adapter.

[0036] In the picture:

[0037] 1. Connecting port body; 101. First main body part; 102. Second main body part; 1021. Sealing part; 1022. Connecting part; 103. Elastic groove; 104. Sealing surface; 105. Vent groove; 106. Limiting ring;

[0038] 2. Limiting component; 201. Guide surface;

[0039] 3. Cover; 4. Assembly interface; 401. Connecting hole; 402. Connecting component; 403. Screw joint. Detailed Implementation

[0040] The technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0041] In the description of this utility model, it should be understood that the terms "center", "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0042] The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature.

[0043] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0044] like Figures 1 to 3 As shown in the schematic embodiment of the connection port structure of the liquid reservoir cover of this utility model, the connection port structure of the liquid reservoir cover includes a connection port body 1 and a limiting member 2.

[0045] The reservoir has a cup body and a lid 3. The cup body holds the paint, and the lid 3 is installed on the cup body to seal the cup opening. One end of the connecting port body 1 is connected to the lid 3, allowing the internal space of the cup body to communicate with the outside through the connecting port body 1 on the lid 3. In other words, the connecting port body 1 on the lid 3 is the only channel connecting the cup body to the external space. A limiting member 2 is provided on the side wall of the connecting port body 1. When the reservoir is installed on the spray gun, the spray gun is equipped with an assembly interface 4. The assembly interface 4 is usually an integral structure on the spray gun, or a detachable adapter connected to the spray gun. See [link to documentation]. Figure 4 The assembly interface 4 has a connection hole 401, and the connecting member 402 of the assembly interface 4 has a screw-in part 403. The connecting port body 1 on the cover 3 is inserted into the connection hole 401. The liquid reservoir or the assembly interface 4 is rotated so that the screw-in part 403 rotates relative to the connecting port body 1, thereby screwing the screw-in part 403 into the side of the limiting member 2 near the cover 3. The limiting member 2 locks the screw-in part 403 and prevents the screw-in part 403 from moving away from the cover 3 in the axial direction of the cover 3, thereby preventing the connecting port body 1 from coming out of the connecting port in the direction closer to the cover 3. The assembly interface 4 is stably connected to the connecting port body 1 of the cover 3, and the liquid reservoir is fixedly installed on the assembly interface 4 on the gun.

[0046] The main body 1 of the connector is divided into a first main body 101 and a second main body 102 along the direction close to the cover 3. The outer diameter of the second main body 102 is larger than that of the first main body 101. An elastic groove 103 is provided on the second main body 102. The elastic groove 103 is opened axially. During the process of the connector body 1 being inserted into the connecting hole 401 of the assembly interface 4, the first main body 101 and the second main body 102 enter the connecting hole 401 in sequence. The outer circumference of the second main body 102 contacts the inner circumference of the connecting hole 401, and the second main body 102 and the connecting hole 401 are interference-fitted, so that the connecting hole 401 forms a radially inward compression on the second main body 102. The elastic groove 103 narrows as the second main body 102 is compressed, and the second main body 102 undergoes a small deformation, so that the outer diameter of the second main body 102 matches the inner diameter of the connecting hole 401, and the outer circumference of the second main body 102 is tightly fitted with the inner circumference of the connecting hole 401.

[0047] The reservoir is generally made of plastic parts. Plastic parts have a certain degree of elasticity, so that after the second main body 102 of the connection port body 1 is deformed under the pressure of the connection hole 401, a certain elastic force is generated. The elastic force acts radially on the inner wall of the connection hole 401, so that the outer wall of the second main body 102 fits more tightly with the inner wall of the connection hole 401.

[0048] This structural design, through the inclusion of an elastic groove 103, allows the second main body 102 to possess a certain degree of deformation capability. This allows the second main body 102, after being inserted into the connecting hole 401, to fit tightly against the hole through deformation. This not only ensures an interference fit between the connecting body 1 and the connecting hole 401, achieving a better sealing effect and reducing the risk of paint leakage, but also improves the efficiency and quality of painting operations. Furthermore, the deformation of the second main body 102 allows for smooth insertion into the connecting hole 401, reducing the obstruction to the connecting body 1's entry and preventing the connecting hole 401 from scratching the outer wall of the second main body 102, thus preventing gaps and further ensuring a good sealing effect. Additionally, the second main body 102 possesses a certain degree of elasticity; the elastic force generated after deformation further enhances the tightness of the fit between the connecting body 1 and the connecting hole 401, further strengthening the sealing effect.

[0049] See also in this application. Figures 1 to 3 The axial length L1 of the first main body 101 is 3-12 mm; the limiting member 2 is disposed on the second main body 102, and the axial distance L2 between the limiting member 2 and the end of the second main body 102 near the first main body 101 is 2-6 mm. This structural design ensures that the insertion and mating part of the connecting port body 1 and the connecting hole 401 has sufficient length. After the connecting port body 1 is inserted into the connecting hole 401, it can form a sufficient contact area with the inner wall of the connecting hole 401, which enhances the firmness and sealing of the connection and reduces the risk of paint leakage due to unstable connection. On the other hand, the length of the connecting port body 1 is reasonably controlled, saving materials and reducing costs. It also ensures that the liquid container cap does not occupy too much space during packaging. This is of great significance for placing as many caps as possible in a limited packaging box, which helps to improve packaging efficiency, reduce transportation costs, and also helps to reduce the occupation of storage space.

[0050] See also in this application. Figures 1 to 3 The end face of the second main body 102 away from the cover 3 is designated as a sealing surface 104. That is, when the outer diameter of the connecting body 1 changes from the second main body 102 to the first main body 101, an annular surface is formed at the end of the second main body 102. The connecting hole 401 mates with the connecting body 1, forming two sections with different inner diameters and a stepped surface between them. When the connecting body 1 is inserted into the connecting hole 401, the first main body 101 and the second main body 102 respectively fit against the two sections of the connecting hole 401, and the sealing surface 104 fits against the stepped surface. This structural design further improves the tightness of the fit between the connecting body 1 and the connecting hole 401 of the assembly interface 4, creating a tortuous joint structure that provides an additional physical barrier, further increasing the difficulty of paint leakage through this joint and further enhancing the sealing performance.

[0051] See also in this application. Figures 1 to 3 The sealing surface 104 is a conical surface with an outer diameter that gradually increases towards the cover body 3. This structural design allows the sealing surface 104 to gradually conform to the stepped surface when the connecting body 1 is screwed into the assembly interface 4, providing more uniform sealing pressure and improving the tightness of the fit between the sealing surface 104 and the stepped surface. In addition, the conical surface guides the connecting body 1 to axially align with the connecting hole 401, ensuring that the connecting body 1 conforms evenly and tightly to the inner wall of the connecting hole 401 around its circumference. This facilitates positioning and installation, simplifies the installation process, and ensures the consistency of the sealing effect around the circumference of the gap.

[0052] See also in this application. Figures 1 to 2 The second main body 102 is divided into a sealing part 1021 and a connecting part 1022 along the direction close to the cover 3. The outer diameter of the connecting part 1022 is larger than that of the sealing part 1021. The connecting body 1 is inserted into the connecting hole 401. The sealing part 1021, with a relatively smaller outer diameter, enters the connecting hole 401 and is press-fitted with it. The connecting part 1022, with a relatively larger outer diameter, is located outside the connecting hole 401, attached to the end face of the assembly interface 4, and covers the opening of the connecting hole 401, thereby closing the opening of the connecting hole 401. This structural design allows the sealing part 1021 of the second main body 102 to focus on the press-fit to achieve sealing, while the connecting part 1022 is responsible for axially fitting the end face of the assembly interface 4 and covering the opening of the connecting hole 401 to achieve sealing. This provides the second main body 102 with double sealing protection, improving the stability and sealing performance of the overall structure and reducing the risk of leakage due to the failure of a single sealing point.

[0053] See also in this application. Figures 1 to 3 An elastic groove 103 is axially disposed on the sealing part 1021, with both ends of the elastic groove 103 penetrating the sealing part 1021. After the painting operation, due to the consumption of paint in the reservoir, a negative pressure is generated inside the reservoir. Under the action of the negative pressure, the reservoir is tightly adhering to the assembly interface 4, making disassembly difficult. This structural design allows for a slight rotation of the reservoir during disassembly, causing a slight axial movement of the reservoir relative to the assembly interface 4. This exposes one end of the elastic groove 103 near the cover 3 outside the assembly interface 4. At the same time, the slight axial movement of the reservoir away from the assembly interface 4 causes a slight widening of the elastic groove 103. External air enters the elastic groove 103 through the exposed end and then enters the reservoir through the other end of the elastic groove 103, eliminating the negative pressure inside the reservoir and thus eliminating the strong adhesion of the reservoir to the assembly interface 4, allowing the reservoir to be easily removed from the assembly interface 4.

[0054] See also in this application. Figure 1A venting groove 105 is provided on the connecting part 1022, which is axially opposite to the elastic groove 103. One end of the venting groove 105 passes through the connecting part 1022, connecting the venting groove 105 to the elastic groove 103. This structural design further eliminates the obstruction of ventilation by the connecting part 1022, ensuring that when the liquid reservoir is rotated slightly, external air can enter the liquid reservoir through the venting groove 105 and the elastic groove 103, eliminating the negative pressure inside the liquid reservoir, so as to easily remove the liquid reservoir.

[0055] See also in this application. Figures 1 to 3 The limiting member 2 is disposed on the connecting part 1022. The surface of the limiting member 2 away from the cover 3 is flush with the end face of the connecting part 1022 away from the cover 3. The elastic groove 103 is opposite to the limiting member 2. This structure allows the limiting member 2 to also adhere to the end face of the assembly interface 4 when the connecting body 1 is connected to the assembly interface 4, so that the elastic groove 103 is fully inserted into the connecting hole 401 and forms a covering and blocking effect on the elastic groove 103, further improving the sealing performance.

[0056] See also in this application. Figures 1 to 3 A limiting ring 106 is provided on the end of the second main body 102 away from the first main body 101, and the limiting ring 106 is arranged around the outer wall of the second main body 102. The limiting ring 106 connects to the cover 3. During the process of inserting the connecting port body 1 into the connecting hole 401, the connecting member 402 on the end face of the assembly interface 4 abuts against the limiting ring 106, preventing the assembly interface 4 from moving further towards the cover 3, so that the screw-on part 403 on the connecting member 402 is opposite to the space on the side of the limiting member 2 near the cover 3. Even if the screw-on part 403 is aligned with the space between the limiting member 2 and the limiting ring 106, at this time, rotating the liquid reservoir or the assembly interface 4 can screw the screw-on part 403 into the space between it and the limiting ring 106, so that the limiting member 2 prevents the screw-on part 403 from moving axially, and the connection between the liquid reservoir and the assembly interface 4 is maintained by snap-fit.

[0057] This structural design allows for the positioning and alignment of the assembly interface 4 and the connection body 1, enabling the screw-on part 403 to engage with the limiting member 2, thus improving the ease of installation of the reservoir. Furthermore, it allows the assembly interface 4 to be positioned as close as possible to the cover 3, enhancing the compactness of the reservoir's installation on the spray gun and eliminating the impact of its large dimensions on the painting operation. Additionally, the limiting ring 106 is disc-shaped and attached to the cover 3, serving as a reinforcing structure to increase the connection strength between the cover 3 and the connection body 1.

[0058] In some of these embodiments, see Figure 3The limiting member 2 has a guide surface 201 on its surface near the cover 3. When the screw-in part 403 is screwed into the space near the cover 3 of the limiting member 2, the screw-in part 403 slides on the guide surface 201. The guide surface 201 is inclined and gradually approaches the cover 3 along the screw-in direction of the screw-in part 403. During the screw-in process, the screw-in part 403 slides on the guide surface 201. The inclined guide surface 201 causes the limiting member to gradually push the screw-in part 403 towards the cover 3, so that the connecting port body 1 on the cover 3 is further inserted into the connecting hole 401. This structural design allows for a smooth transition during the screw-in process of the screw-in part 403, gradually pulling the assembly interface 4 towards the cover 3. The connecting port body 1 is tightly pressed against the spray gun side in the connecting hole 401, ensuring smooth installation of the liquid reservoir and improving the firmness of the connection.

[0059] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0060] The above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A connection port structure of a reservoir cap, characterized by, include: The connector body is used to be inserted into the connector hole of the assembly interface; one end of the connector body is used to connect to the cover. A limiting member is provided on the side wall of the connecting port body; the limiting member is used to restrict the screw-in portion of the assembly interface screwed into the side of the cover body, so as to prevent the connecting port body from coming out of the connecting hole. The connection port body is divided into a first main body and a second main body in sequence along the direction close to the cover; the outer diameter of the second main body is larger than the outer diameter of the first main body, and the second main body is used to make an interference fit with the connection hole; The second main body is provided with an elastic groove, which is used to shrink and narrow when the second main body is in interference fit with the connecting hole.

2. The connection port structure of a reservoir cap according to claim 1, wherein The axial length of the first main body is 3 to 12 mm; the limiting member is disposed on the second main body, and the axial distance between the limiting member and the end of the second main body near the first main body is 2 to 6 mm.

3. The connection port structure of a reservoir cap according to claim 1, wherein The end face of the second main body away from the cover is set as a sealing surface, which is used to adhere to the stepped surface provided on the inner wall of the connecting hole.

4. The connection port structure of a reservoir cap body according to claim 3, wherein The sealing surface is a conical surface whose outer diameter gradually increases towards the cover.

5. The port structure of a reservoir cap according to claim 1, wherein The second main body is divided into a sealing part and a connecting part in sequence along the direction close to the cover; the outer diameter of the connecting part is larger than the outer diameter of the sealing part, the sealing part is used to interfere with the connecting hole, and the connecting part is used to axially attach to the end face of the assembly interface to cover the opening of the connecting hole.

6. The connection port structure of a reservoir cap body according to claim 5, wherein The elastic groove is axially disposed on the sealing part, and both ends of the elastic groove penetrate the sealing part.

7. The connection port structure of a reservoir cap body according to claim 6, wherein The connecting part is provided with a venting groove, which is axially opposite to the elastic groove; one end of the venting groove passes through the connecting part so that the venting groove is connected to the elastic groove.

8. The connection port structure of a reservoir cap according to claim 6, wherein The limiting member is disposed on the connecting part, and the surface of the limiting member away from the cover is flush with the end face of the connecting part away from the cover. The elastic groove is opposite to the limiting member.

9. The port structure of a reservoir cap according to claim 1, wherein A limiting ring is provided on the end of the second main body away from the first main body, and the limiting ring is arranged around the outer wall of the second main body; the limiting ring is used to connect the cover and restrict the movement of the assembly interface toward the cover when it is attached to the screw-on part, so that the space of the screw-on part and the limiting member on the side of the cover are opposite.

10. The port structure of a reservoir cap according to claim 1, wherein The limiting member has a guide surface on the side of the cover for sliding contact with the screw-in part. The guide surface is inclined so that it gradually approaches the cover along the direction in which the screw-in part is screwed in.

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