Sealing interface structure and liquid cooling system
By using the threaded connection of the internal and external threaded sections, combined with the design of the inner smooth section, the coaxiality problem of the sealing interface structure and the uneven force on the sealing ring are solved, thereby improving the sealing reliability and service life, and making it suitable for liquid cooling systems.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-11
- Publication Date
- 2026-03-13
AI Technical Summary
Existing sealing interface structures suffer from poor coaxiality and uneven stress on the sealing rings, resulting in poor sealing performance and insufficient service life.
The connection method uses internal and external thread sections to ensure coaxiality between the fittings and the connectors. The sealing ring is evenly compressed under the threaded fit. The design of the internal smooth section and the external thread section reduces friction damage to the sealing ring. Locking elements are used to enhance the connection strength.
It improves the reliability and service life of the sealing interface, has a simple structure, occupies little space, is economical, and significantly improves the sealing effect.
Smart Images
Figure CN223992030U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of joint sealing, and more particularly to a sealing interface structure and a liquid cooling system. Background Technology
[0002] Sealed interface structures are commonly used in sealing applications between connectors and interfaces. Typically, an annular sealing ring is placed on the outer wall of the connector, and the connector is inserted into and fixed inside the interface, so that the sealing ring abuts against the inner wall of the interface, thereby achieving the function of connecting and sealing the connector and interface.
[0003] However, current sealing interface structures suffer from problems such as low coaxiality and uneven stress on the sealing rings, which affect the performance and service life of the sealing interface structure. Utility Model Content
[0004] This application provides a sealing interface structure and a liquid cooling system to solve the technical problems of unreliable sealing and insufficient service life of current sealing interfaces.
[0005] In a first aspect, this application provides a sealing interface structure having an axial orientation. The sealing interface structure includes: a fitting having a mating end face at one end of the axial direction, the fitting having an axially extending interface from the mating end face, the inner wall of the interface having an inner smooth section and an inner thread section sequentially arranged along the axial direction, the inner thread section being located on the side of the inner smooth section away from the mating end face; and a connector having an axially extending joint, the outer wall of the joint having an outer smooth section and an outer thread section sequentially arranged along the axial direction, the outer thread section being located at the end of the outer smooth section near the interface; wherein the outer thread section and the inner thread section are threadedly engaged to connect the connector to the connector, at least one of the outer smooth section and the inner smooth section is fitted with a sealing ring, the sealing ring being sandwiched between the outer smooth section and the inner smooth section for sealing the two.
[0006] The above technical solution achieves a threaded connection between the fittings and connectors via the engagement of internal and external threaded sections. This ensures coaxiality between the fittings and connectors. During the screwing of the connector into the interface, the threaded structure allows for more even compression of the sealing ring, thus guaranteeing sealing reliability. It is understandable that in related technologies, the sealing ring is constantly in contact with and compressed against the inner wall of the interface during connector insertion. Due to the soft material of the sealing ring and the uncertainty of the direction of the compression force, the coaxiality between the connector and the interface is difficult to define precisely, resulting in varying compression forces at different locations of the sealing ring, thus affecting sealing performance. Furthermore, the fixing of the fittings and connectors requires no external auxiliary components; it relies solely on the threaded engagement, resulting in a simple overall structure, small footprint, and good economic efficiency. Moreover, the design of the internal threaded section and the smooth inner section prevents the sealing ring from contacting the internal threaded section, reducing frictional damage to the sealing ring when the connector is connected to the interface and ensuring a good seal. Understandably, since the internal thread section is located on the side of the internal smooth section away from the mating end face, when the sealing ring is located on the external smooth section, the sealing ring contacts the internal smooth section rather than the internal thread section when the connector is inserted into the interface. This results in the sealing ring being subjected to less or no friction and pressure from the threaded concave and convex structure, thereby reducing damage to the sealing ring.
[0007] As one of the optional embodiments of this application, in the axial direction, the size of the inner smooth section is L1 and the size of the outer threaded section is L2, satisfying L1≤L2.
[0008] To achieve the above technical solution, the sealing ring is located outside the interface before the internal thread section mates with the external thread section. Only after the internal thread section mates with the external thread section will the sealing ring come into contact with the inner smooth section. Therefore, when the sealing ring begins to contact the inner smooth section, the threaded mating relationship between the internal thread section and the external thread section has already been formed. This ensures that the sealing ring is constrained by coaxial screwing throughout the subsequent screwing process, thereby further ensuring the uniformity of the sealing ring compression, improving sealing performance and service life.
[0009] As one of the optional embodiments of this application, the sealing ring includes a first sealing ring and a second sealing ring arranged sequentially at intervals along the axial direction, with the first sealing ring disposed on the side of the second sealing ring away from the internal thread section.
[0010] As one of the optional embodiments of this application, it further includes a radial direction, which is perpendicular to the axial direction; in the radial direction, the protrusion dimension of the first sealing ring relative to the inner smooth segment is greater than the protrusion dimension of the second sealing ring relative to the inner smooth segment.
[0011] To achieve the above technical solution, the first and second sealing rings have a radial height difference, allowing them to exert different degrees of compression against the inner wall of the interface, thus creating sealing effects with varying compression levels. It is understandable that if the protrusion dimensions of the first and second sealing rings are the same, their compression levels will be essentially identical. Therefore, if the first sealing ring fails, the second sealing ring may also fail for the same reason, resulting in insufficient sealing performance. In this embodiment, however, by using stepped compression sealing, two sealing layers with different sealing effects are formed, thereby ensuring sealing performance.
[0012] As one of the optional embodiments of this application, a chamfer is provided at one end of the interface near the mating end face. The chamfer has an inclined surface that is inclined relative to the axial direction, and the second sealing ring is pressed against the inclined surface.
[0013] To achieve the above technical solution, the chamfering reduces interference between the joint and the interface, making it easier for the joint to be inserted into the interface. Furthermore, since the second sealing ring and the inclined surface are in contact at an angle, they can simultaneously form axial and radial seals, thereby further improving the sealing performance.
[0014] As one of the optional embodiments of this application, the connector further includes a base body disposed at one end of the connector away from the internal thread section, and the outer wall of the base body is provided with a limiting part, which abuts against the mating end face.
[0015] By implementing the above technical solution, operators can determine whether the joint has been screwed in correctly by the contact between the limiting part and the mating end face, thereby improving the accuracy of assembly.
[0016] As one of the optional embodiments of this application, a locking member is also included. The locking member is sleeved on the outer wall of the base near the connector end. The locking member is threadedly engaged with the mating part to press the limiting part against the mating end face.
[0017] To achieve the above technical solution, firstly, the connector and interface form a first-layer fixed connection structure through threaded engagement. Secondly, the locking element and the mating part threadedly engage to fix the connector within the interface, forming a second-layer fixed connection structure. The combination of these two connection structures significantly improves the connection strength between the connector and interface, thereby ensuring the reliability of the sealed interface structure. Furthermore, due to the locking structure of the locking element, the connection strength is guaranteed, so it is not necessary to completely lock the connector to a fixed position. In some optional embodiments, the thread engagement between the internal and external thread sections can be stopped at any position, meaning the tightening depth can be controlled, thereby controlling different rotation angles of the connector, which is beneficial for subsequent installation.
[0018] As one optional embodiment of this application, the locking member has a central hole, and the base body passes through the central hole;
[0019] The outer wall of the base away from the joint is provided with a protrusion, and the locking part is provided with an axially penetrating relief groove. The relief groove is connected to the central hole. When the base passes through the central hole, the protrusion passes through the relief groove.
[0020] To achieve the above technical solution, in some application scenarios, a protruding structure is provided on the base. In order to facilitate the smooth installation of the locking component, an avoidance groove is provided on the locking component without affecting the cooperation between the locking component and the limiting part.
[0021] As one of the optional embodiments of this application, a sealing gasket is also included, which is sandwiched between the mating end face and the limiting part.
[0022] By implementing the above technical solution, the sealing gasket can achieve radial sealing, thereby cooperating with the sealing ring to achieve a more precise and reliable seal and improve the overall sealing performance of the sealing interface structure.
[0023] On the other hand, this application also provides a liquid cooling system including the aforementioned sealed interface structure.
[0024] One of the above technical solutions has the following advantages or beneficial effects: The threaded connection between the fitting and the connector is achieved through the engagement of internal and external threaded sections. On the one hand, this ensures the coaxiality between the fitting and the connector. During the screwing of the connector into the interface, the threaded structure allows the sealing ring to be more evenly compressed, thus ensuring reliable sealing. It is understood that in related technologies, during the connector insertion process, the sealing ring is constantly in contact with and compressed against the inner wall of the interface. Due to the soft material of the sealing ring and the uncertainty of the direction of the compression force, the coaxiality between the connector and the interface is difficult to define precisely, resulting in different compression forces at different positions of the sealing ring, thus affecting sealing performance. On the other hand, the fixing of the fitting and the connector does not require external auxiliary components; it can be fixed solely by the threaded engagement, resulting in a simple overall structure, small footprint, and good economic efficiency. Furthermore, the positional design of the internal threaded section and the smooth inner section prevents the sealing ring from contacting the internal threaded section, thereby reducing frictional damage to the sealing ring when the connector is connected to the interface and ensuring a good sealing effect. Attached Figure Description
[0025] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.
[0026] Figure 1 This is an overall cross-sectional view of the sealing interface structure provided in the embodiments of this application;
[0027] Figure 2 This is a cross-sectional view provided in an embodiment of this application to illustrate the structure of the accessory;
[0028] Figure 3 This is a cross-sectional view provided in an embodiment of this application to illustrate the connector structure;
[0029] Figure 4 This is a perspective sectional view provided in an embodiment of this application to illustrate the structure of the locking component;
[0030] Figure 5 This is a cross-sectional view of another locking element and its threaded fit with the fitting provided in this application.
[0031] Reference numerals: 1. Fitting parts; 100. Mating end face; 10. Interface; 101. Smooth inner section; 102. Threaded inner section;
[0032] 2. Connector; 20. Joint; 201. Smooth outer section; 202. Threaded outer section; 21. Base; 21a. Limiting part; 21b. Protrusion;
[0033] 3. Sealing ring; 31. First sealing ring; 32. Second sealing ring;
[0034] 4. Chamfer; 40° beveled surface;
[0035] 5. Locking component; 50. Center hole; 500. Clearance groove; 51. Main body; 52. Connecting part;
[0036] 6. Sealing gasket;
[0037] X, axial direction; Y, radial direction. Detailed Implementation
[0038] The technical solutions of the embodiments of this application 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 application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.
[0039] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the term "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Furthermore, the character " / " in this document, unless otherwise specified, generally indicates that the preceding and following related objects have an "or" relationship.
[0040] The following is in conjunction with the appendix Figure 1-5 This application will be further described below.
[0041] Reference Figures 1-3This application provides a sealing interface structure that can be used for sealing connections of fluid flow pipelines. Examples include butt joint seals for pipelines in a liquid cooling system of a battery pack, and butt joint seals for pipelines in an automotive cooling system. This sealing interface structure has an axial (X) and radial (Y) orientation, which are perpendicular to each other. It should be noted that the axial (X) and radial (Y) orientations are not necessarily perfectly perpendicular; in some embodiments, there is an acceptable margin between the axial (X) and radial (Y) orientations, for example, the included angle between the axial (X) and radial (Y) orientations can be within the range of 90° plus or minus 10°.
[0042] The sealing interface structure includes a fitting 1 and a connector 2. The connector 2 is inserted into the fitting 1, and a sealing ring 3 is provided on the connector 2 for sealing between the two. Specifically:
[0043] Reference Figure 1 and Figure 2 The fitting 1 has a mating end face 100 at one end in the axial direction X. The fitting 1 has an interface 10 extending in the axial direction X from the mating end face 100. The inner wall of the interface 10 is provided with an inner smooth section 101 and an inner thread section 102 in sequence along the axial direction X. The inner thread section 102 is located on the side of the inner smooth section 101 away from the mating end face 100.
[0044] It should be noted that the smooth inner section 101 refers to a flat surface on the inner wall of the interface 10, so that the sealing ring 3 can abut against the smooth inner section 101 and be compressed and deformed to achieve a sealing effect. The threaded inner section 102 refers to a surface on the inner wall of the interface 10 with an internal thread. It should be noted that the threaded inner section 102 can be a complete ring or a discontinuous ring, as long as a threaded fit can be achieved.
[0045] Reference Figure 1 and Figure 3 The connector 2 has a joint 20 extending along the axial direction X. The outer wall of the joint 20 is provided with an outer smooth section 201 and an external thread section 202 in sequence along the axial direction X. The external thread section 202 is located at one end of the outer smooth section 201 near the internal thread section 102. The external thread section 202 is threadedly engaged with the internal thread section 102 so that the connector 2 is connected to the connector 2. At least one of the outer smooth section 201 and the internal smooth section 101 is provided with an annular sealing ring 3. The annular sealing ring 3 is sandwiched between the outer smooth section 201 and the internal smooth section 101 for sealing the two.
[0046] It should be noted that the smooth outer section 201 refers to a flat surface on the outer wall of the connector 20, which allows the sealing ring 3 to abut against and compress the smooth outer section 201 to achieve a sealing effect. The threaded outer section 202 refers to a surface on the outer wall of the connector 20 with external threads. It should be noted that the threaded outer section 202 can be a complete ring or a discontinuous ring, as long as it can achieve thread engagement with the internal thread section 102.
[0047] To achieve the above technical solution, the accessory 1 and the connector 2 are connected by a threaded connection through the engagement of the internal thread section 102 and the external thread section 202. This ensures the coaxiality between the accessory 1 and the connector 2. During the screwing of the connector 20 into the interface 10, the threaded connection allows the sealing ring 3 to be more evenly compressed, thus ensuring reliable sealing. It is understood that in related technologies, during the insertion of the connector 20 into the interface 10, the sealing ring 3 is constantly in contact with and compressed against the inner wall of the interface 10. Due to the soft material of the sealing ring 3 and the uncertainty of the direction of the compressive force, the coaxiality between the connector 20 and the interface 10 is difficult to define precisely, resulting in different compressive forces at different positions of the sealing ring 3, thus affecting the sealing performance. However, in this embodiment, because the connector 20 and the interface 10 are threadedly engaged, the compressive force on the sealing ring 3 during deformation and compression is more uniform, thereby improving the sealing effect.
[0048] On the other hand, the fixing between accessory 1 and connector 2 requires no external auxiliary parts; it can be fixed solely by threaded engagement, resulting in a simple overall structure, small footprint, and good economic efficiency. Furthermore, due to the positional design of the internal thread section 102 and the internal smooth section 101, the sealing ring 3 does not contact the internal thread section 102, thereby reducing frictional damage to the sealing ring 3 when the connector 21 is connected to the interface 10, ensuring a good sealing effect. It is understandable that, since the internal thread section 102 is located on the side of the internal smooth section 101 away from the mating end face 100, when the sealing ring 3 is located on the outer smooth section 201, the sealing ring 3 contacts the inner smooth section 101 instead of the internal thread section 102 when the connector 20 is inserted into the interface 10. This reduces or eliminates the frictional pressure from the threaded concave-convex structure on the sealing ring 3, thus reducing damage to the sealing ring 3.
[0049] As one optional embodiment of this application, in the axial direction X, the dimension of the inner smooth section 101 is L1, and the dimension of the outer thread section 202 is L2, satisfying L1≤L2. Before the inner thread section 102 and the outer thread section 202 mate, the sealing ring 3 is outside the interface 10. Only after the inner thread section 102 and the outer thread section 202 mate will the sealing ring 3 come into contact with the inner smooth section 101. Therefore, when the sealing ring 3 begins to contact the inner smooth section 101, the threaded engagement relationship between the inner thread section 102 and the outer thread section 202 has been formed. This ensures that the sealing ring 3 is constrained by coaxial screwing throughout the subsequent screwing process, thereby further ensuring the uniformity of the compression of the sealing ring 3, improving the sealing performance and service life.
[0050] As one optional embodiment of this application, the sealing ring 3 includes a first sealing ring 31 and a second sealing ring 32 arranged sequentially at intervals along the axial direction X. The first sealing ring 31 is disposed on the side of the second sealing ring 32 away from the internal thread section 102. In the radial direction Y, the protrusion dimension of the first sealing ring 31 relative to the inner smooth section 101 is greater than the protrusion dimension of the second sealing ring 32 relative to the inner smooth section 101.
[0051] To achieve the above technical solution, the first sealing ring 31 and the second sealing ring 32 have a difference in height in the radial Y direction, allowing them to form different degrees of compression with the inner wall of the interface 10, thereby creating sealing effects with different compression amounts. It is understandable that if the protrusion dimensions of the first sealing ring 31 and the second sealing ring 32 are the same, and the compression amounts of the first sealing ring 31 and the second sealing ring 32 are basically the same, then when the first sealing ring 31 fails, the second sealing ring 32 may also fail for the same reason, resulting in insufficient sealing performance. However, in this embodiment, by using stepped compression sealing, two sealing layers with different sealing effects are formed, thereby ensuring sealing performance.
[0052] In some optional embodiments, both the first sealing ring 31 and the second sealing ring 32 are disposed on the outer smooth section 201. Specifically, the connector 20 has an annular groove recessed from the outer smooth section 201, and both the first sealing ring 31 and the second sealing ring 32 are annular, embedded in the corresponding groove. In some embodiments, the depths of the two grooves can be differentiated to achieve the technical function that the protrusion of the first sealing ring 31 is greater than that of the second sealing ring 32.
[0053] It should be noted that the embedding positions of the first sealing ring 31 and the second sealing ring 32 should not be limited to the above settings. In some optional examples, the first sealing ring 31 and the second sealing ring 32 can be set on the inner smooth section 101 at the same time, or optionally, the first sealing ring 31 and the second sealing ring 32 can be set on the inner smooth section 101 and the outer smooth section 201 respectively.
[0054] As one optional embodiment of this application, the interface 10 has a chamfer 4 at one end near the mating end face 100. The chamfer 4 has an inclined surface 40 that is inclined relative to the axial direction X, and the second sealing ring 32 is pressed onto the inclined surface 40. To achieve the above technical solution, the chamfer 4 reduces interference between the connector 20 and the interface 10, thereby facilitating the insertion of the connector 20 into the interface 10. Furthermore, since the second sealing ring 32 and the inclined surface 40 are in inclined contact, they can simultaneously form seals in both the axial direction X and the radial direction Y, thereby further improving the sealing performance.
[0055] As one optional embodiment of this application, a sealing gasket 6 is also included, which is sandwiched between the mating end face 100 and the limiting portion 21a. By implementing the above technical solution, the sealing gasket 6 can achieve a seal along the radial Y direction, thereby cooperating with the sealing ring 3 to achieve a more precise and reliable seal, and improving the overall sealing performance of the sealing interface structure.
[0056] Reference Figure 3 As one optional embodiment of this application, the connector 2 further includes a base 21, which is disposed at the end of the connector 20 away from the internal thread section 102. The outer wall of the base 21 is provided with a limiting part 21a, which abuts against the mating end face 100. Specifically, the base 21 and the connector 20 are coaxial and integrally connected. A medium channel extending along the axial direction X is provided in the base 21 and the connector 20 to facilitate the smooth flow of the medium.
[0057] By implementing the above technical solution, the operator can determine whether the connector 20 is screwed into place by the contact between the limiting part 21a and the mating end face 100, thereby improving the accuracy of assembly.
[0058] In this embodiment, since the fixing of the connector 20 to the interface 10 relies entirely on the threaded engagement of the internal thread section 102 and the external thread section 202, the connector 20 needs to be tightened to a certain position to achieve a relatively stable and reliable fixation. However, this makes it impossible to control the rotation angle of the connector 20, which is not convenient and flexible enough when connecting it to other components later.
[0059] Therefore, in some alternative embodiments, the sealing interface structure further includes a locking member 5, which is sleeved on the outer wall of the base 21 near the connector 20. The locking member 5 is threadedly engaged with the mating part 1 to press the limiting part 21a against the mating end face 100.
[0060] To achieve the above technical solution, firstly, the connector 20 and the interface 10 form a first-layer fixed connection structure through threaded engagement. Secondly, the locking element 5 and the mating part 1 are threaded together to fix the connector 20 inside the interface 10, forming a second-layer fixed connection structure. The combination of these two connection structures can significantly improve the connection strength between the connector 20 and the interface 10, thereby ensuring the reliability of the sealed interface structure. On the other hand, due to the locking structure of the locking element 5, the connection strength is guaranteed. Therefore, it is not necessary to completely lock the connector 20 to a fixed position. In some optional embodiments, the threaded engagement between the internal thread section 102 and the external thread section 202 can be stopped at any position, that is, the tightening depth can be controlled to control different rotation angles of the connector 20, which is beneficial for subsequent installation.
[0061] Reference Figure 1 and Figure 4As one optional embodiment of this application, the locking member 5 has a central hole 50, and the base 21 passes through the central hole 50. A protrusion 21b is provided on the outer wall of the end of the base 21 away from the connector 20. An axial clearance groove 500 is provided on the locking member 5, communicating with the central hole 50. When the base 21 passes through the central hole 50, the protrusion 21b passes through the clearance groove 500. In some applications, a protrusion 21b structure is provided on the base 21. To facilitate smooth installation of the locking member 5, a clearance groove 500 is provided on the locking member 5 without affecting the fit between the locking member 5 and the limiting part 21a.
[0062] Specifically, four protrusions 21b are provided and are evenly spaced around the axis of the base 21, and four corresponding clearance grooves 500 are also provided for each protrusion 21b. The design of the clearance grooves 500 facilitates the installation of the locking member 5 on the outside of the base 21.
[0063] It should be noted that, in this embodiment, the locking member 5 is threadedly connected to the outer wall of the mating part 1. Specifically, the locking member 5 includes an annular main body 51 and an annular connecting part 52 arranged sequentially along the axial direction X. The main body 51 and the connecting part 52 are integrally connected, and the inner wall of the connecting part 52 is threaded. Furthermore, the inner diameter of the connecting part 52 is larger than the inner diameter of the main body 51, creating a step between the main body 51 and the connecting part 52. During assembly, the connecting part 52 engages with the threaded outer wall of the mating part 1, and the main body 51 presses against the limiting part 21a, causing the limiting part 21a to abut against the mating end face 100.
[0064] In some optional examples, refer to Figure 5 The locking element 5 can also be threaded into the inner wall of the interface 10. This design is more suitable for some applications where space saving is required.
[0065] On the other hand, this application also provides a liquid cooling system including the aforementioned sealed interface structure.
[0066] The partial implementation of the embodiments of this application is not intended to limit the application in any way. The protection scope of the embodiments of this application is not limited thereto. Any simple modifications, equivalent changes and alterations that can be easily conceived by those skilled in the art within the technical scope disclosed in the embodiments of this application should be included within the protection scope of the embodiments of this application.
Claims
1. A seal interface structure, characterized by, The sealing interface structure has an axial direction, and the sealing interface structure comprises: a mating piece having a mating end face at one end in the axial direction, the mating piece being provided with an interface extending in the axial direction from the mating end face, an inner wall of the interface being sequentially provided with an inner smooth section and an inner threaded section in the axial direction, the inner threaded section being arranged on a side of the inner smooth section away from the mating end face; a plug-in piece having a joint extending in the axial direction, an outer wall of the joint being sequentially provided with an outer smooth section and an outer threaded section in the axial direction, the outer threaded section being arranged on an end of the outer smooth section close to the interface; wherein the outer threaded section is threadedly connected with the inner threaded section to connect the plug-in piece with the mating piece, at least one of the outer smooth section and the inner smooth section being embedded with a sealing ring, the sealing ring being clamped between the outer smooth section and the inner smooth section for sealing the two sections.
2. The sealed interface structure of claim 1, wherein, In the axial direction, a size of the inner smooth section is L1, and a size of the outer threaded section is L2, and L1≤L2 is satisfied.
3. The sealed interface structure of claim 1, wherein, The sealing ring comprises a first sealing ring and a second sealing ring sequentially and spaced apart in the axial direction, the first sealing ring being arranged on a side of the second sealing ring away from the inner threaded section.
4. The sealed interface structure of claim 3, wherein, A radial direction is further included, the radial direction being perpendicular to the axial direction; In the radial direction, a protruding size of the first sealing ring relative to the inner smooth section is greater than a protruding size of the second sealing ring relative to the inner smooth section.
5. The sealed interface structure of claim 4, wherein, An end of the interface close to the mating end face is provided with a chamfer, the chamfer having an inclined surface inclined relative to the axial direction, and the second sealing ring is press-fitted on the inclined surface.
6. The sealed interface structure of claim 1, wherein, The plug-in piece further comprises a base body arranged on an end of the joint away from the inner threaded section, an outer wall of the base body being provided with a limiting portion, and the limiting portion is in abutment with the mating end face.
7. The sealed interface structure of claim 6, wherein, A locking piece is further included, the locking piece being sleeved on an outer wall of the base body close to the joint, the locking piece being threadedly connected with the mating piece to press the limiting portion against the mating end face.
8. The sealed interface structure of claim 7, wherein, The locking piece has a central hole, and the base body is arranged to pass through the central hole; wherein an end of the base body away from the joint is provided with a protrusion, the locking piece is provided with an avoiding slot penetrating through in the axial direction, the avoiding slot is in communication with the central hole, and when the base body passes through the central hole, the protrusion passes through the avoiding slot.
9. The sealed interface structure of claim 6, wherein, A sealing gasket is further included, the sealing gasket being clamped between the mating end face and the limiting portion.
10. A liquid cooling system, characterized by, The sealing interface structure comprises any one of claims 1-9.