Sealing joint

Abstract

The utility model relates to the technical field of batteries, and provides a sealing joint which comprises a sealing pipeline, a flange plate, a sealing gasket and a limiting structure, the sealing pipeline is provided with a liquid flow channel, the flange plate is connected to the sealing pipeline and provided with a connecting face, and the sealing gasket is connected to the connecting face. A reserved installation area is formed between the edge of the sealing gasket and the edge of the connecting face, a limiting structure is installed in the reserved installation area, and the top face, in the first direction, of the limiting structure is lower than the top face, in the first direction, of the sealing gasket. According to the sealing joint, the effective sealing width of the sealing gasket can be increased, and therefore the sealing effect of the sealing gasket is improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to a sealing joint. Background Art

[0002] To achieve the cooling of a battery pack, it is necessary to connect a liquid cooling system to the inside of the battery pack housing, and the purpose of cooling the battery pack is achieved by the flow of coolant inside the housing. To ensure the sealing effect, a sealing joint is usually configured on the housing. This sealing joint connects the liquid cooling system and the pipeline system inside the housing. The sealing joint is installed on the surface of the housing in the form of a flange. A sealing gasket is provided inside the flange. A limiting structure is provided around the mounting hole of the flange. This limiting structure can prevent the sealing failure caused by excessive compression of the sealing gasket and can ensure the sealing effect of the sealing gasket.

[0003] Since a limiting structure is provided around the mounting hole, this limiting structure will occupy the space around the mounting hole, so that the limiting structure will reduce the effective sealing width of the sealing gasket. To ensure the effective sealing width, it is necessary to increase the size of the flange, which results in an increase in design cost and is also not conducive to the installation of the sealing joint in a small space. Summary of the Utility Model

[0004] The present application provides a sealing joint, which can improve the effective sealing width of the sealing gasket, thereby improving the sealing effect of the sealing gasket.

[0005] According to the sealing structure in the embodiment of the present application, it includes:

[0006] A sealed pipeline having a liquid flow channel;

[0007] A flange connected to the sealed pipeline, and the flange has a connection surface;

[0008] A sealing gasket, the sealing gasket is connected to the connection surface, and a reserved installation area is formed between the edge of the sealing gasket and the edge of the connection surface;

[0009] And a limiting structure, the limiting structure is installed in the reserved installation area, and the top surface of the limiting structure in the first direction is lower than the top surface of the sealing gasket in the first direction.

[0010] The sealing structure in the embodiments of the present application includes a sealing pipe, a flange, a gasket, and a limiting structure. The sealing pipe serves the function of connection, the flange serves the function of connection, the gasket serves the function of sealing, and the limiting structure can prevent the gasket from being overly compressed. The components are reliably connected and their functions are relatively independent, which can improve the stability of the sealing joint in terms of structure and function execution. The limiting structure is arranged in the reserved installation area avoiding the gasket, without occupying the space of the gasket, increasing the effective sealing width of the gasket, thereby improving the sealing effect of the gasket. When ensuring the same sealing effect, the size of the sealing joint can be designed smaller, which is beneficial to the installation of the sealing joint in a small space and can also reduce the manufacturing cost of the sealing joint.

[0011] In a possible implementation manner, there are multiple reserved installation areas, which are dispersedly arranged at the edge of the gasket.

[0012] In a possible implementation manner, the multiple reserved installation areas are arranged in a ring shape.

[0013] In a possible implementation manner, there is one reserved installation area, which is end-to-end.

[0014] In a possible implementation manner, the flange is of a square structure, and one of the limiting structures is provided at each of the four corners of the flange.

[0015] In a possible implementation manner, the distance between the top surface of the limiting structure and the top surface of the gasket is L1, and L1 satisfies the relationship:

[0016] L1≥2mm.

[0017] In a possible implementation manner, the connection surface is a plane, the gasket and the limiting structure are installed on the connection surface, the height of the limiting structure is L2, and L2 satisfies the relationship: L2 = 2mm - 3mm. The height of the gasket is L3, and L3 satisfies the relationship: L3 = 4mm - 6mm.

[0018] In a possible implementation manner, a gap is formed between the edge of the gasket and the limiting structure, and the width L4 of the gap satisfies the relationship:

[0019] L4≥1mm.

[0020] In a possible implementation manner, the flange has an installation hole, the gasket has a through hole communicating with the installation hole, the aperture of the installation hole is D1, the aperture of the through hole is D2, and D1 and D2 satisfy the relationship: D2 = D1 + a, where a satisfies the relationship: 0≤a≤4mm.

[0021] In a possible implementation manner, the limiting structure includes an inner side surface and an outer side surface. The inner side surface has a structure adapted to the edge of the gasket, and the outer side surface is flush with the edge of the flange.

[0022] In a possible implementation manner, the limiting structure includes at least one of a limiting block, a limiting protrusion, and a limiting rib. Description of the Drawings

[0023] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1 Shows a front view of a sealing joint provided according to an embodiment of the present application in a use state;

[0025] Figure 2 Shows a left view of a sealing joint provided according to an embodiment of the present application in a use state;

[0026] Figure 3 Shows Figure 2 A partial enlarged view of part A in

[0027] Reference Numerals:

[0028] 100 - Sealed pipe; 101 - Liquid flow channel;

[0029] 200 - Flange; 201 - Connection surface; 202 - Mounting hole;

[0030] 300 - Gasket; 301 - Through hole;

[0031] 400 - Limiting structure; 401 - Inner side surface; 402 - Outer side surface;

[0032] 11 - Reserved installation area. Detailed Embodiments

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the protection scope of the present utility model.

[0034] With the rapid development of the new energy vehicle industry, new energy vehicles have put forward higher and higher requirements for the performance of battery packs. For example, battery packs need to have a larger capacity and a higher charging rate.

[0035] The power source of new energy vehicles mainly depends on battery packs. A large amount of heat is generated during the operation of battery packs. When the battery pack has a higher capacity and a higher charging rate, more heat will be generated by the battery pack. To maintain the stability and safety of the battery pack during operation, a liquid cooling system needs to be set up for the battery pack. Battery packs usually come with a box body. To achieve the cooling of the battery pack, the pipelines in the liquid cooling system need to be connected to the box body of the battery pack so as to be connected to the pipeline system in the box body.

[0036] When the pipelines in the liquid cooling system are connected to the pipeline system in the box body, they need to pass through the box body of the battery pack. To ensure the sealing effect, a sealing joint is usually set on the surface of the box body. The two ends of the sealing joint are respectively connected to the pipeline in the liquid cooling system and the pipeline system in the box body, so as to realize the connection between the liquid cooling system and the pipeline system in the box body.

[0037] The box body structure of the battery pack is usually a cuboid structure. To improve the connection reliability, the sealing joint adopts the structure form of a flange, that is, the sealing joint is installed on the box body by means of flange connection. For the sealing joint, on the one hand, it is necessary to realize the flow of liquid, so it needs to be designed as a tubular structure with a liquid flow channel in the center to be connected to the liquid cooling system and the pipeline system in the box body. On the other hand, the sealing joint needs to be equipped with a flange for connecting to the box body. On the other hand, a sealing gasket also needs to be set on one side of the flange for realizing the sealed connection with the box body. When installing the sealing joint on the box body, installation holes need to be designed on the flange, and then the flange is installed on the box body through connecting pieces such as bolts.

[0038] During the process of installing the flange on the box body, connecting pieces such as bolts need to pass through the flange and the sealing gasket. To prevent the problem of the sealing gasket failure caused by the excessive compression of the sealing gasket due to the excessive connection force of the bolts on the flange, a limiting structure can be set around the installation hole. The limiting structure can surround the bolt, and the thickness of the limiting structure can be greater than the thickness of the sealing gasket.

[0039] The setting of the limiting structure will occupy the space around the bolt, making the width of the sealing gasket between the bolt and the liquid flow channel and between the bolt and the edge of the sealing gasket narrower, resulting in a smaller effective sealing width of the sealing gasket. To ensure the sealing effect, it is necessary to increase the size of the flange, which leads to an increase in the design cost and is also not conducive to the installation of the sealing joint in a small space.

[0040] Based on the above current situation and problems, the present application provides a sealing joint. In terms of structure, the sealing joint adopts an avoidance design concept, enabling the limiting structure to minimally interfere with the gasket as much as possible. The limiting structure and the gasket can perform their respective functions, and the effective sealing width of the gasket will not be narrowed due to the presence of the limiting structure.

[0041] During the specific design, changes are mainly made to the position, specific structure of the limiting structure, and the surrounding structure of the limiting structure. In terms of position, the limiting structure is at least partially transferred from the inside of the gasket to the outside of the gasket. In terms of the specific structure, the limiting structure needs to have sufficient strength and be able to form good assembly with other structures. In terms of the surrounding structure, it is necessary to make the limiting structure adapt in shape and size to other parts of the sealing joint. The specific structure of the limiting structure and the surrounding structure of the limiting structure are supporting designs made after the change in the position of the limiting structure.

[0042] The sealing joint in the embodiment of the present application has a specific structural composition different from the traditional technology. Based on the design concept of the limiting structure avoiding the gasket, the limiting structure can reduce the space occupied by the gasket, thereby improving the sealing effect of the gasket. Under the condition of ensuring the same sealing effect, the size of the sealing joint can be designed smaller, which is beneficial to the installation of the sealing joint in a small space and can also reduce the manufacturing cost of the sealing joint.

[0043] The sealing joint in the embodiment of the present application can be applied in a battery pack to realize the connection between the pipeline system and the liquid cooling system in the box body of the battery pack. Both the liquid cooling system and the battery pack can be components of a new energy vehicle, or the battery pack can be part of the power system in a new energy vehicle, and the liquid cooling system can be part of the cooling system in a new energy vehicle. In addition, it can be understood that the main function of the sealing joint in the embodiment of the present application is to realize the connection between the internal pipeline (such as the aforementioned pipeline system) and the external pipeline (such as the aforementioned liquid cooling system) while ensuring sealing. Therefore, in other fields that require connecting internal pipelines and external pipelines, the sealing joint in the embodiment of the present application can also be adopted.

[0044] Figure 1 shows the front view of a sealing joint provided according to an embodiment of the present application in a use state; Figure 2 shows the left view of a sealing joint provided according to an embodiment of the present application in a use state. In the embodiment of the present application, please refer to Figure 1 and Figure 2 , the sealing joint includes a sealing pipe 100, a flange 200, a gasket 300, and a limiting structure 400.

[0045] The sealed pipeline 100 is a structure that serves as a connection in the sealed joint. Its function is to connect the pipeline system and the liquid cooling system of the battery. The sealed pipeline 100 has a liquid flow channel 101 inside. The coolant can flow from the liquid cooling system through the liquid flow channel 101 into the pipeline system of the battery, and the coolant can also flow from the pipeline system of the battery through the liquid flow channel 101 into the liquid cooling system.

[0046] It can be understood that the sealed pipeline 100 can be designed as a tubular structure with openings at both ends. One opening is used to connect to the liquid cooling system, and the other opening is used to connect to the pipeline system of the battery. The sealed pipeline 100 can be made of the same material as the pipeline system or other materials. To ensure connection reliability, a sealing structure can be provided between the sealed pipeline 100 and the liquid cooling system, and between the sealed pipeline 100 and the pipeline system. Or the connection structure between the sealed pipeline 100 and the liquid cooling system, and between the sealed pipeline 100 and the pipeline system can be reasonably designed. As a sealing structure, an outsourcing method can be adopted. For example, a rubber ring is selected and the rubber ring is wrapped around the outer periphery of the connection interface. An embedding method can also be adopted. For example, the rubber ring is embedded into the inside of the connection interface. As for the connection structure, the connection port can be designed to be stepped. For example, the openings at both ends of the sealed pipeline 100 can be designed to be stepped, so that when connecting to the pipeline system and the liquid cooling system, the corresponding parts of the pipeline system and the liquid cooling system can be embedded into the sealed pipeline 100.

[0047] The sealed pipeline 100 is usually designed as a straight pipe structure, as Figure 1 shown. In the embodiments of the present application, the sealed pipeline 100 with a straight pipe structure is mainly taken as an example for illustration. In some other cases, for example, when the horizontal or vertical space of the installation position is limited, the sealed pipeline 100 can also be designed as a bent pipe structure. The specific structure of the sealed pipeline 100 in the embodiments of the present application is not limited.

[0048] In the embodiments of the present application, the material of the sealed pipeline 100 can be selected as materials such as aluminum alloy, for example, Al6063 or Al6061 can be adopted. Of course, in other embodiments, the sealed pipeline 100 can also adopt other metal materials with heat resistance, cold resistance or corrosion resistance. In addition, on the premise of ensuring sufficient structural strength and connection reliability, the sealed pipeline 100 can even adopt polymer materials.

[0049] The flange 200 is a structure that serves as a connection in the sealing joint, and its function is to install the sealing joint onto the battery box body. The flange 200 is connected to the sealing pipe 100. The flange 200 has a connection surface 201. The flange 200 can be connected to the outer wall surface of the sealing pipe 100. The plane where the flange 200 is located can be perpendicular to the extension direction of the sealing pipe 100, or can form an angle. The connection surface 201 is the surface on the flange 200 that needs to contact the box body, and this connection surface 201 faces the box body. The flange 200 can also be a positioning structure of the sealing joint. During the process of installing the sealing joint onto the box body, the flange 200 can contact the box body so as to form a positioning for the subsequent installation of the sealing joint. In the embodiment of the present application, mainly taking the plane where the flange 200 is located being perpendicular to the extension direction of the sealing pipe 100 as an example for illustration, in other embodiments, this angular relationship can be reasonably adjusted according to specific structural requirements and space requirements.

[0050] The flange 200 can be integrally formed with the sealing pipe 100. For example, the corresponding casting liquid can be injected into a predetermined mold by integral injection molding to form the sealing pipe 100 with the flange 200. The flange 200 and the sealing pipe 100 can also be formed separately. For example, the sealing pipe 100 and the flange 200 are processed separately, and then the flange is installed onto the sealing pipe 100 by welding or mechanical connection.

[0051] In the embodiment of the present application, the material of the flange 200 can be the same as that of the sealing pipe 100, and materials such as aluminum alloy can be selected. For example, Al6063 or Al6061 can be adopted.

[0052] The gasket 300 is a structure that serves as a seal in the sealing joint, and its function is that after the sealing joint is installed onto the box body, the gasket 300 can closely adhere to the surface of the box body, thereby preventing the coolant from flowing out through the gap between the sealing joint and the box body. The gasket 300 is connected to the connection surface 201 on the aforementioned flange 200, so that the gasket 300 can face the box body. A reserved installation area 11 is formed between the edge of the gasket 300 and the edge of the connection surface 201.

[0053] It should be noted here that to ensure the unified coordination in the structure of the sealing joint, generally the gasket 300 will not exceed the edge of the flange 200. In the specific design, the local edge of the gasket 300 can be designed to be retracted inside the flange 200, that is, the gasket 300 has a smaller size at these local positions, so that a part of the connection surface 201 can be left at these edge positions of the gasket 300, and this part of the connection surface 201 forms the aforementioned reserved installation area 11.

[0054] In the embodiments of the present application, the shape, size, and arrangement of the reserved installation area 11 can be set according to actual situations, and the present application does not make special restrictions on this.

[0055] The gasket 300 in the embodiments of the present application can be made of materials such as silica gel and rubber. To ensure the sealing effect, the gasket 300 can be made of foam, such as silica gel foam.

[0056] The limiting structure 400 is installed in the above-mentioned reserved installation area 11, and the top surface of the limiting structure 400 in the first direction is higher than the top surface of the gasket 300 in the first direction.

[0057] It should be noted that the "first direction" and the height relationship here are description methods for simplifying the description and facilitating understanding, and do not mean that the first direction must be the vertical direction, and the height relationship must be the vertical height position relationship. It can be understood that the structure farther away from the reference point in the first direction can correspond to a higher height. For example, the reference point can be established on the connection surface 201, and the top surface of the gasket 300 is farther away from the reference point. In the embodiments of the present application, reference can be made to Figure 1 . The first direction can be understood as the extension direction of the sealed pipe 100, that is, the Z direction, or it can also be understood as the thickness direction of the flange 200. In other words, when installing the sealed joint onto the box body, the gasket 300 first contacts the box body, and the gasket 300 can be compressed under the action of the connection force, so that the limiting structure 400 then contacts the box body. During the above process, the gasket 300 can prevent being over-compressed.

[0058] In the embodiments of the present application, the sealed pipe 100 performs the function of connection, the flange 200 performs the function of connection, the gasket 300 performs the function of sealing, and the limiting structure 400 can prevent the gasket 300 from being over-compressed. Each component is reliably connected, and each function is relatively independent, which can improve the stability of the sealed joint in terms of structure and function execution. The limiting structure 400 is arranged in the reserved installation area 11 avoiding the gasket 300, which will not occupy the space of the gasket 300, so that the effective sealing width of the gasket 300 is increased, thereby improving the sealing effect of the gasket 300. Under the condition of ensuring the same sealing effect, the size of the sealed joint can be designed to be smaller, which is beneficial to the installation of the sealed joint in a small space and can also reduce the manufacturing cost of the sealed joint.

[0059] In the embodiments of the present application, to form the above-mentioned reserved installation area 11, various designs can be made for the structures and dimensions of the gasket 300 and the flange 200. Different types of reserved installation areas 11 can be formed by matching different dimensional relationships on the basis of the structural design. For example, the flange 200 can be disc-shaped or square-shaped. Correspondingly, the connection surface 201 on the flange 200 can be circular or square-shaped. The gasket 300 can be disc-shaped or square-shaped. The shape of the gasket 300 can correspond to that of the flange 200. For example, when the flange 200 is disc-shaped, the gasket 300 is also disc-shaped. Another example is that when the flange 200 is disc-shaped, the gasket 300 is square-shaped.

[0060] For the convenience of description and understanding, the following embodiments will take the flange 200 and the gasket 300 with a square structure as examples for illustration. It can be understood that the formation method of the reserved installation area 11 described in the following embodiments can also be applied to the flange 200 and the gasket 300 in other combination relationships. For the flange 200 and the gasket 300 with a square structure, to form the reserved installation area 11, the dimensions of some parts of the gasket 300 can be designed to be smaller than the corresponding dimensions of the flange 200. Different parts and different dimensional relationships will form different types of reserved installation areas 11.

[0061] In some embodiments, there are multiple reserved installation areas 11, which are dispersedly arranged on the edge of the gasket 300.

[0062] In the above embodiments, most of the gaskets 300 can be designed to be flush with the flange 200, that is, the edge of the gasket 300 is flush with the edge of the flange 200. To form the reserved installation area 11, multiple material removal areas can be formed on the gasket 300. These material removal areas are dispersedly located on the edge of the gasket 300, and the reserved installation area 11 can be formed at these material removal areas. The other areas except the material removal areas can be flush with the edge of the flange 200.

[0063] In the above embodiments, the reserved installation areas 11 are dispersedly arranged. A limiting structure 400 can be arranged in each reserved installation area 11. The dispersed arrangement of the limiting structures 400 can jointly share the connection force brought by bolts and the like, and can improve the overall strength of the sealed joint. In addition, designing most of the gaskets 300 to be flush with the flange 200 can increase the contact area between the gasket 300 and the box body, thereby improving the sealing effect.

[0064] In some specific embodiments, multiple reserved installation areas 11 can be arranged in a ring shape. Further, they can be evenly arranged in a ring shape, so that each limiting structure 400 can receive balanced acting forces, thereby improving the stability of the sealed joint.

[0065] In some specific embodiments, the number of reserved installation areas 11 is not limited. For example, it can be two, three, or four. It can be understood that to ensure force balance, the number of reserved installation areas 11 can be an even number and symmetrically arranged at the edge of the gasket 300.

[0066] In some specific embodiments, the specific shape of the reserved installation area 11 is not limited. For example, the reserved installation area 11 can be a square area, a triangular area, or an oval area or a circular area, etc. Correspondingly, the limiting structure 400 arranged in the reserved installation area 11 can also be changed in the specific shape as described above.

[0067] In some other embodiments, please refer to Figure 2 , the reserved installation area 11 is one and connected end to end.

[0068] In the above embodiments, the entire circumference edge of the gasket 300 is recessed within the flange 200. That is, for the gasket 300, its dimensions in all directions are smaller than those of the flange 200, so that a complete circular area is formed at the edge of the gasket 300, and this circular area can form the above single - form reserved installation area 11.

[0069] In the above embodiments, the formation method of the single - form reserved installation area 11 is simple. By selecting a gasket 300 with a size smaller than that of the flange 200 and connecting it to the connection surface 201 of the flange 200. In Figure 2 the shown example, a square - structured gasket 300 is arranged on a square - structured flange 200, and a complete circular - shaped area is formed at the edge of the gasket 300. The limiting structure 400 can be arranged in this circular area. The number and position of the limiting structure 400 are not limited. For example, the limiting structure 400 can be four, respectively arranged at the four corners of the flange 200, or the limiting structure 400 can also be two, respectively arranged at two diagonally - related corners of the flange 200.

[0070] In some embodiments, the distance between the top surface of the limiting structure 400 and the top surface of the gasket 300 is L1, and L1 satisfies the relationship:

[0071] L1≥2mm.

[0072] L1 represents the compression allowance of the gasket 300. Combining the above - mentioned content, during the process of installing the gasket 300 onto the box body, the gasket 300 first contacts the surface of the box body. During the process of tightening fasteners such as lock bolts, the gasket 300 will be gradually compressed under the action of the connection force until the limiting structure 400 abuts against the surface of the box body. Setting the compression allowance to 2mm can improve the sealing effect on the basis of ensuring sufficient connection strength.

[0073] It is understandable that the specific value of L1 can be set according to actual situations such as the area of the flange 200, the area of the gasket 300, and the material of the gasket 300. When the areas of the flange 200 and the gasket 300 are large, the value of L1 can be large. For example, L1 = 3 mm. When the areas of the flange 200 and the gasket 300 are small, the value of L1 can be small. For example, L1 = 2 mm. When the gasket 300 is made of foam, the value of L1 can be large. For example, L1 = 5 mm. When the gasket 300 is made of rubber, the value of L1 can be small. For example, L1 = 2.5 mm.

[0074] In some embodiments, the connection surface 201 is a plane, the gasket 300 and the limiting structure 400 are installed on the connection surface 201. The height of the limiting structure 400 is L2, and the height of the gasket 300 is L3. L2 is approximately half of L3.

[0075] As described above, the heights of the gasket 300 and the limiting structure 400 are the lengths extending along the first direction with the plane where the connection surface 201 is located as the reference point. Here, setting the height of the limiting structure 400 to be half of the height of the gasket 300 is a dimensional design in combination with the elasticity of the gasket 300 and the required connection strength. Adopting this dimensional design can stably connect the sealing joint to the box body and ensure the sealing effect of the sealing joint on the box body. When designing the specific dimensions of L2 and L3, factors such as the area of the flange 200, the area of the gasket 300, and the material of the gasket 300 can be considered comprehensively for reasonable configuration.

[0076] For example, in some specific embodiments, the height of the limiting structure 400 is L2, and L2 satisfies the relationship: L2 = 2 mm - 3 mm. The height of the gasket 300 is L3, and L3 satisfies the relationship: L3 = 4 mm - 6 mm.

[0077] Designing L2 according to the above dimensions can ensure the structural strength of the limiting structure 400. Designing L3 according to the above dimensions can ensure that the gasket 300 has sufficient compressibility, and can improve the sealing performance on the basis of achieving the connection strength.

[0078] Again, for example, in some specific embodiments, the height of the limiting structure 400 is L2, and L2 satisfies the relationship: L2 = 3 mm - 4 mm. The height of the gasket 300 is L3, and L3 satisfies the relationship: L3 = 6 mm - 8 mm.

[0079] The larger dimensional design here can better match the larger-sized flange 200 and gasket 300, and can coordinate the overall strength and sealing performance of the sealing joint.

[0080] Combined with the above embodiments, it can be seen that during the installation of the sealing joint in the present application embodiment into the box body, the sealing gasket 300 will be gradually compressed. Therefore, the height (in the first direction) of the sealing gasket 300 will continuously decrease, and the width of the sealing gasket 300 will continuously increase. For example, in Figure 2 the illustrated example, as fasteners such as bolts connect the flange 200 to the box body, the sealing gasket 300 will expand around in the X direction and the Y direction. During the expansion process, the sealing gasket 300 may squeeze the limiting structure 400, and the limiting structure 400 will exert a reaction force on the sealing gasket 300, causing a greater force on the edge of the sealing gasket 300. The sealing gasket 300 may bulge, resulting in a poor contact effect between the sealing gasket 300 and the box body and affecting the sealing effect.

[0081] To solve the above problems, when designing the limiting structure 400 and the sealing gasket 300, not only the height difference between the limiting structure 400 and the sealing gasket 300 in the first direction needs to be considered, but also the dimensional differences between the limiting structure 400 and the sealing gasket 300 in the X direction and the Y direction need to be considered.

[0082] Figure 3 shows Figure 2 a partial enlarged view of part A in Figure 3 . In some embodiments, please refer to

[0083] where there is a gap S formed between the edge of the sealing gasket 300 and the limiting structure 400, and the width L4 of the gap S satisfies the relationship: L4 ≥ 1 mm.

[0084] The above embodiments have described in detail the position of the limiting structure 400, the specific structure of the limiting structure 400, and the peripheral structure of the limiting structure 400. Among them, the limiting structure 400 can be located at the edge of the flange 200; the specific structure of the limiting structure 400 is not limited, and the limiting structure 400 includes at least one of a limiting block, a limiting protrusion, and a limiting rib, and it can be configured into a structural shape adapted to the gasket 300 and the flange 200. For example, the limiting structure 400 includes an inner side surface 401 and an outer side surface 402. The inner side surface 401 has a structure adapted to the edge of the gasket 300, and the outer side surface 402 is flush with the edge of the flange 200; the peripheral structure of the limiting structure 400 is reflected by various dimensional relationships between the limiting structure 400 and the gasket 300. It should be noted that the above embodiments list the case where the limiting structure 400 is provided at the edge of the flange 200. In some special cases, the limiting structure 400 can also be provided at an internal position of the flange 200. In this case, two types of limiting structures 400 can be provided at the same time. One type is provided at the edge of the flange 200, and the other type can be provided at an internal position of the flange 200.

[0085] In addition to the above, through holes for bolts to pass through need to be left on both the flange 200 and the gasket 300. To prevent the gasket 300 from being squeezed onto the bolts when compressed, the following design solutions can be adopted.

[0086] In some embodiments, the flange 200 has a mounting hole 202, and the gasket 300 has a through hole 301 communicating with the mounting hole 202. The aperture of the mounting hole 202 is D1, and the aperture of the through hole 301 is D2. D1 and D2 satisfy the relationship: D2 = D1 + a, and a satisfies the relationship: 0 ≤ a ≤ 4 mm.

[0087] Designing the value range of a according to the above dimensions can well combine with the deformation ability of the gasket 300, so that during the compression process of the gasket 300, the gasket 300 will not contact the bolts and cause local deformation.

[0088] It can be understood that the value of a can be related to L4 in the above embodiments. For the gasket 300 with uniform material distribution, when the gasket 300 is subjected to the force of the box body, the gasket 300 can uniformly expand outward in the X direction and the Y direction. At this time, the deformation of the gasket 300 near the through hole 301 should be the same as the deformation amount at the edge. For example, when L4 = 1 mm, a = 2 mm.

[0089] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0090] In the description of the present utility model, it should be understood that the terms "comprising" and "having" used in the embodiments of the present application and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0091] Unless otherwise clearly defined and limited, the terms "installed", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be directly connected, or indirectly connected through an intermediate medium, which can be the connection inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features.

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and are not intended to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A sealing joint, characterized in that: include: A sealed conduit having a fluid flow passage; A flange connected to the sealing pipe, wherein the flange has a connecting surface; A sealing gasket, the sealing gasket is connected to the connecting surface, and a reserved installation area is formed between an edge of the sealing gasket and an edge of the connecting surface; and a limiting structure, wherein the limiting structure is installed in the reserved installation area, and a top surface of the limiting structure along a first direction is lower than a top surface of the sealing gasket along the first direction.

2. The sealing joint according to claim 1, characterized in that: The reserved installation areas are multiple and dispersedly arranged on the edge of the sealing gasket.

3. The sealing joint according to claim 2, characterized in that: The plurality of reserved installation areas are arranged in a ring shape.

4. The sealing joint according to claim 1, characterized in that: The reserved installation area is one and connected end to end.

5. The sealing joint according to any one of claims 1 to 4, characterized in that: The flange is a square structure, and each of the four corners of the flange is provided with a limiting structure.

6. The sealing joint according to any one of claims 1 to 4, characterized in that: The distance between the top surface of the limiting structure and the top surface of the sealing gasket is L1, and L1 satisfies the relationship: L1≥2mm.

7. The sealing joint according to claim 6, characterized in that: The connecting surface is a plane, the sealing gasket and the limiting structure are installed on the connecting surface, the limiting structure has a height L2, and L2 satisfies the relationship: L2=2mm~3mm, and the sealing gasket has a height L3, and L3 satisfies the relationship: L3=4mm~6mm.

8. The sealing joint according to claim 7, characterized in that: A gap is formed between the edge of the sealing gasket and the limiting structure, and the width L4 of the gap satisfies the relationship: L4≥1mm.

9. The sealing joint according to any one of claims 1 to 4, characterized in that: The flange has a mounting hole, and the sealing gasket has a through hole connected to the mounting hole. The diameter of the mounting hole is D1, and the diameter of the through hole is D2. D1 and D2 satisfy the relationship: D2=D1+a, and a satisfies the relationship: 0≤a≤4mm.

10. The sealing joint according to any one of claims 1 to 4, characterized in that: The limiting structure includes an inner side surface and an outer side surface, the inner side surface has a structure adapted to the edge of the sealing gasket, and the outer side surface is flush with the edge of the flange.

11. The sealing joint according to any one of claims 1 to 4, characterized in that: The limiting structure includes at least one of a limiting block, a limiting protrusion, and a limiting rib.

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