Composite retaining ring and sealing structure

Abstract

This utility model discloses a composite retaining ring and a sealing structure. The composite retaining ring includes: a first ring body, with a first snap-fit ​​portion on its outer side wall; and a second ring body, with a second snap-fit ​​portion on its inner side wall. The second ring body is fitted over the first ring body, and the second snap-fit ​​portion snaps into the first snap-fit ​​portion. One of the first and second snap-fit ​​portions is a groove, and the other is a buckle. When the first snap-fit ​​portion is a buckle, it is integrally formed with the first ring body; when the second snap-fit ​​portion is a buckle, it is integrally formed with the second ring body. When assembling the first and second ring bodies, by fitting the second ring body over the first ring body and engaging the second snap-fit ​​portion within the first snap-fit ​​portion, the second and first ring bodies are securely fastened together. The assembly method of the first and second ring bodies is simple.

Description

Technical Field

[0001] This utility model relates to the field of mechanical auxiliary parts technology, and in particular to a composite retaining ring and sealing structure. Background Technology

[0002] In related technologies, retaining rings are typically made of a single material. The application scenarios for single-material retaining rings are limited, mainly targeting general operating conditions, such as those with normal temperature and pressure. However, as the pressure and temperature of operating conditions increase, PTFE and modified PTFE, as traditional retaining ring materials, no longer meet the requirements for high-temperature and high-pressure applications due to their low hardness and modulus (elastic modulus 1000MPa). Therefore, high-modulus, high-temperature resistant rigid plastics such as PEEK, PI, and PA are often used to make retaining rings.

[0003] However, using a single high-modulus rigid plastic as the retaining ring is prone to wear and tear on the elastic seal due to frequent contact between the retaining ring's structure and the elastic seal. Therefore, related technologies often add a layer of soft plastic, such as PTFE, as a protective layer. Currently, the common method for combining these two materials is adhesive bonding. However, the bonding effect is limited by the adhesive, and the bonding process requires immediate alignment of the two materials; otherwise, misalignment is difficult to correct, making the operation quite challenging. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a composite retaining ring, which can reduce the difficulty of its assembly.

[0005] This utility model also proposes a sealing structure having the above-mentioned composite retaining ring.

[0006] According to a first aspect of the present invention, a composite retaining ring includes: a first ring body, wherein a first snap-fit ​​portion is provided on the outer side wall of the first ring body; a second ring body, wherein a second snap-fit ​​portion is provided on the inner side wall of the second ring body, the second ring body is sleeved on the outside of the first ring body, and the second snap-fit ​​portion snaps with the first snap-fit ​​portion; wherein, one of the first snap-fit ​​portion and the second snap-fit ​​portion is a slot and the other is a buckle;

[0007] When the first snap-fit ​​part is the buckle, the first snap-fit ​​part and the first ring body are integrally formed; when the second snap-fit ​​part is the buckle, the second snap-fit ​​part and the second ring body are integrally formed.

[0008] The composite retaining ring according to the embodiment of this utility model has at least the following beneficial effects:

[0009] In this composite retaining ring, when assembling the first and second rings, the second ring is fitted over the first ring, and the second locking part engages with the first locking part, thus securing the second and first rings together firmly. The assembly method is simple, and the cooperation between the first and second locking parts also provides a positioning effect, ensuring the assembly accuracy of the first and second rings. Furthermore, if either ring is damaged, it can be directly replaced.

[0010] According to some embodiments of the present invention, the first snap-fit ​​part is an annular structure and is coaxially arranged with the first ring body, and the second snap-fit ​​part is an annular structure and is coaxially arranged with the second ring body.

[0011] According to some embodiments of the present invention, the outer diameter of the first ring body is defined as d1, the inner diameter of the first ring body is defined as d2, the outer diameter of the second ring body is defined as D1, and the inner diameter of the second ring body is defined as D2;

[0012] When D1-D2>d1-d2, the first snap-fit ​​part is the buckle, and the second snap-fit ​​part is the slot.

[0013] When D1-D2 < d1-d2, the first snap-fit ​​part is the slot, and the second snap-fit ​​part is the buckle.

[0014] According to some embodiments of the present invention, the second ring body is provided with a first cut, the first cut extends from the outer side wall of the second ring body toward the inner side wall of the second ring body, and the first cut cuts off the second ring body;

[0015] The first ring body has a second cut, which extends from the outer side wall of the first ring body toward the inner side wall of the first ring body, and the second cut cuts off the first ring body;

[0016] The second cut is opposite to and connected to the first cut.

[0017] According to some embodiments of the present invention, the extension direction of the first cut from the outer wall of the second ring to the inner wall of the second ring is the same as the extension direction of the second cut from the outer wall of the first ring to the inner wall of the first ring.

[0018] According to some embodiments of the present invention, the first cut and the second cut cooperate to form a cut assembly. The composite retaining ring has a first cut surface and a second cut surface that is spaced apart from and opposite to the first cut surface. The cut assembly is formed between the first cut surface and the second cut surface. Both ends of the first snap-fit ​​portion and both ends of the second snap-fit ​​portion extend to the first cut surface and the second cut surface, respectively. The first cut surface is provided with a first adhesive groove surrounding the buckle, and a first adhesive is provided in the first adhesive groove.

[0019] According to some embodiments of the present invention, the second cut surface is provided with a second adhesive groove surrounding the buckle, and a second adhesive is provided in the second adhesive groove.

[0020] According to some embodiments of the present invention, the material of the first ring body is softer than the material of the second ring body, and the end of the first cut near the outer sidewall of the second ring body has a first edge and a second edge that are arranged opposite to each other and spaced apart. The first edge has a first chamfer, and the second edge has a second chamfer. Alternatively, the material of the second ring body is softer than the material of the first ring body, and the end of the second cut near the inner sidewall of the first ring body has a third edge and a fourth edge that are arranged opposite to each other and spaced apart. The third edge has a third chamfer, and the fourth edge has a fourth chamfer.

[0021] According to some embodiments of the present invention, there are multiple first snap-fit ​​portions, and the multiple first snap-fit ​​portions are spaced apart along the thickness direction of the first ring body; there are multiple second snap-fit ​​portions, and the multiple second snap-fit ​​portions are spaced apart along the thickness direction of the second ring body.

[0022] Each of the first snap-fit ​​parts is snapped into one of the second snap-fit ​​parts.

[0023] A sealing structure according to a second aspect of the present invention includes: a sealing assembly; and a composite retaining ring as described in the above embodiment, wherein the composite retaining ring is disposed on one side of the sealing assembly along the axial direction of the sealing assembly.

[0024] The composite retaining ring according to the embodiment of this utility model has at least the following beneficial effects:

[0025] The sealing structure of this utility model includes the composite retaining ring described in the above embodiment. When assembling the first ring and the second ring, the second ring is fitted over the first ring, and the second locking part engages with the first locking part, thus securing the second ring and the first ring together firmly. The assembly method of the first and second rings is simple. Furthermore, the cooperation between the first and second locking parts also provides a positioning effect, ensuring the assembly accuracy of the first and second rings. Additionally, if any ring is damaged, it can be directly replaced.

[0026] 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

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0028] Figure 1 This is a schematic diagram of the composite retaining ring according to the first embodiment of the present invention;

[0029] Figure 2 This is a cross-sectional view of the composite retaining ring according to the first embodiment of the present invention;

[0030] Figure 3 This is a partial cross-sectional view of the composite retaining ring according to the second embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of the composite retaining ring according to the third embodiment of the present invention;

[0032] Figure 5 This is a partial structural schematic diagram of the composite retaining ring according to the fourth embodiment of the present invention;

[0033] Figure 6 This is a cross-sectional view of the composite retaining ring according to the fifth embodiment of the present invention;

[0034] Figure 7 This is a cross-sectional view of the composite retaining ring according to the sixth embodiment of the present invention;

[0035] Figure 8 This is a cross-sectional view of the composite retaining ring according to the seventh embodiment of the present invention;

[0036] Figure 9 This is a schematic diagram of the sealing structure of the eighth embodiment of the present invention.

[0037] Icon labels:

[0038] 100. Composite retaining ring; 110. First ring body; 111. First snap-fit ​​part; 112. Second cut; 1121. Third cut surface; 120. Second ring body; 121. Second snap-fit ​​part; 122. First cut; 123. First chamfer; 124. Second chamfer; 130. Cut assembly; 131. First cut surface; 132. First glue groove;

[0039] 200. Sealing assembly; 210. Rubber ring; 220. Sealing strip;

[0040] 300. Cylinder body;

[0041] 400, shaft. Detailed Implementation

[0042] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0043] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They 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, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0044] 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 mechanical connection or an electrical 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.

[0045] Example 1:

[0046] like Figure 1 As shown, the composite retaining ring 100 of the present invention in Embodiment 1 includes a first ring body 110 and a second ring body 120, wherein the second ring body 120 is sleeved outside the first ring body 110, the first ring body 110 and the second ring body 120 are connected together, and the first ring body 110 and the second ring body 120 are coaxially arranged.

[0047] Combination Figure 1 and Figure 2The first ring body 110 has a first snap-fit ​​part 111 on its outer side wall; the second ring body 120 has a second snap-fit ​​part 121 on its inner side wall. The second ring body 120 is fitted over the first ring body 110, and the second snap-fit ​​part 121 snaps into the first snap-fit ​​part 111. In this way, the connection between the first ring body 110 and the second ring body 120 can be realized.

[0048] Specifically, the first snap-fit ​​part 111 is a slot, and the second snap-fit ​​part 121 is a buckle. The buckle is inserted into the slot, and the first ring body 110 and the second ring body 120 are fixed by snap-fit. The first snap-fit ​​part 111 can be formed on the outer wall of the first ring body 110 by cutting, or the first ring body 110 with the first snap-fit ​​part 111 can be formed by injection molding. The second snap-fit ​​part 121 is integrally formed on the second ring body 120.

[0049] Understandably, when assembling the first ring 110 and the second ring 120, the second ring 120 is fitted over the first ring 110, and the second locking part 121 engages with the first locking part 111, thus securing the second ring 120 and the first ring 110 together firmly. The assembly method for the first ring 110 and the second ring 120 is simple. Furthermore, the cooperation between the first locking part 111 and the second locking part 121 provides a positioning effect, ensuring the assembly accuracy of the first ring 110 and the second ring 120. Additionally, if either ring is damaged, it can be directly replaced.

[0050] It should be noted that the first engaging portion 111 is an annular structure and is coaxially arranged with the first ring body 110, and the second engaging portion 121 is an annular structure and is coaxially arranged with the second ring body 120. In this way, when the first engaging portion 111 and the second engaging portion 121 are engaged, the relative movement of the first ring body 110 and the second ring body 120 in the radial and axial directions of the composite retaining ring 100 can be restricted.

[0051] Furthermore, the cross-section of the second snap-fit ​​portion 121 (the plane where the central axis of the composite retaining ring 100 is located) is a mushroom-shaped structure, and correspondingly, the cross-section of the first snap-fit ​​portion 111 is also a mushroom-shaped groove structure.

[0052] like Figure 2 As shown, the outer diameter of the first ring body 110 is defined as d1, the inner diameter of the first ring body 110 is defined as d2, the outer diameter of the second ring body 120 is defined as D1, and the inner diameter of the second ring body 120 is defined as D2.

[0053] Specifically, in Embodiment 1, D1-D2 < d1-d2, the first snap-fit ​​part 111 is a snap-fit ​​groove, and the second snap-fit ​​part 121 is a snap-fit ​​buckle; in other embodiments, when D1-D2 > d1-d2, the first snap-fit ​​part 111 is a snap-fit ​​buckle, and the second snap-fit ​​part 121 is a snap-fit ​​groove.

[0054] It should be noted that in some other embodiments, regardless of whether the first snap-fit ​​part 111 is a slot and the second snap-fit ​​part 121 is a buckle, or the first snap-fit ​​part 111 is a buckle and the second snap-fit ​​part 121 is a slot, the design may not be based on the size of (D1-D2) and (D1-D2).

[0055] It should also be noted that when the first snap-fit ​​part 111 is a snap fastener, the first snap-fit ​​part 111 and the first ring body 110 are integrally formed; when the second snap-fit ​​part 121 is a snap fastener, the second snap-fit ​​part 121 and the second ring body 120 are integrally formed.

[0056] like Figure 1 As shown, the second ring body 120 is further provided with a first cut 122, which extends from the outer wall of the second ring body 120 toward the inner wall of the second ring body 120 and cuts off the second ring body 120; the first ring body 110 is provided with a second cut 112, which extends from the outer wall of the first ring body 110 toward the inner wall of the first ring body 110 and cuts off the first ring body 110; wherein, the second cut 112 and the first cut 122 are opposite to and connected to each other.

[0057] It is understandable that by setting the first cut 122 and the second cut 112, and making the first cut 122 and the second cut 112 opposite to each other and connected, the installation of the composite retaining ring 100 can be facilitated.

[0058] Specifically, the direction in which the first cut 122 extends from the outer wall of the second ring body 120 to the inner wall of the second ring body 120 is the same as the direction in which the second cut 112 extends from the outer wall of the first ring body 110 to the inner wall of the first ring body 110.

[0059] Define a plane perpendicular to the central axis of the composite retaining ring 100 as a reference plane. The angle between the first cut 122 and the second cut 112 and the reference plane can be set between 20° and 60°.

[0060] Furthermore, in Embodiment 1, the material of the first ring 110 is softer than the material of the second ring 120. Specifically, the material of the second ring 120 can be a high-temperature resistant rigid plastic such as PEEK (polyetheretherketone), PI (polyimide), or PA (polyamide), while the material of the first ring 110 can be a soft plastic such as PTFE (polytetrafluoroethylene). When assembling the composite retaining ring 100, the second ring 120 is first milled with a first cut 122, and then the second ring 120 is stretched in its radial direction to facilitate fastening to the outside of the first ring 110. When the second ring 120 and the first ring 110 are mated, a tool is inserted into the first cut 122 to cut the first ring 110 along its radial direction to form the second cut 112.

[0061] In other embodiments, the material of the second ring 120 is softer than that of the first ring 110. Specifically, the first ring 110 can be made of high-temperature resistant rigid plastics such as PEEK (polyetheretherketone), PI (polyimide), or PA (polyamide), while the second ring 120 can be made of soft plastics such as PTFE (polytetrafluoroethylene). During assembly of the composite retaining ring 100, the first ring 110 is first milled with a second notch 112, and then compressed radially to facilitate the fitting of the second ring 120 onto its exterior. When the second ring 120 and the first ring 110 mate, a tool is inserted into the second notch 112 to cut the second ring 120 radially to form the first notch 122.

[0062] It should be noted that the hardness setting of the first ring 110 and the second ring 120 needs to take into account the specific application scenario of the composite retaining ring 100. When the composite retaining ring 100 is a shaft sealing component, the second ring 120 is softer than the first ring 110. When the composite retaining ring 100 is a hole sealing component, the first ring 110 is softer than the second ring 120.

[0063] Example 2:

[0064] like Figure 3 As shown, the difference between Embodiment 2 and Embodiment 1 is that: there are multiple first snap-fit ​​portions 111, which are spaced apart along the thickness direction of the first ring body 110; there are multiple second snap-fit ​​portions 121, which are spaced apart along the thickness direction of the second ring body 120; and the multiple first snap-fit ​​portions 111 are snapped into the multiple second snap-fit ​​portions 121 in a one-to-one correspondence. This further improves the connection reliability between the first ring body 110 and the second ring body 120.

[0065] It is understood that in Embodiment 2, the first snap-fit ​​part 111 is a slot and the second snap-fit ​​part 121 is a buckle. Of course, in other embodiments, the first snap-fit ​​part 111 is also configured as a buckle and the first snap-fit ​​part 111 is configured as a slot.

[0066] Example 3:

[0067] like Figure 4As shown, in Embodiment 3, the material of the first ring 110 is softer than that of the second ring 120. The end of the first cut 122 near the outer wall of the second ring 120 has a first edge and a second edge arranged opposite to each other and spaced apart. The difference between Embodiment 3 and Embodiment 1 is that the first edge has a first chamfer 123 and the second edge has a second chamfer 124. Both the first chamfer 123 and the second chamfer 124 are arc-shaped chamfers. Of course, in other embodiments, the first chamfer 123 and the second chamfer 124 can also be beveled. It is understood that when the composite retaining ring 100 is assembled, the second ring 120 is first milled to form the first cut 122, and then the second ring 120 is stretched radially to facilitate fastening to the outside of the first ring 110. When the second ring 120 and the first ring 110 are engaged, a tool is inserted into the first cut 122 to cut the first ring 110 radially to form the second cut 112. It is understandable that during the process of the tool extending from the outside of the second ring body 120 into the first cut 122, the first chamfer 123 and the second chamfer 124 guide the tool.

[0068] In other embodiments, the material of the second ring 120 is softer than that of the first ring 110. The end of the second cut 112 near the inner wall of the first ring 110 has a third edge and a fourth edge arranged opposite to each other and spaced apart. The third edge has a third chamfer, and the fourth edge has a fourth chamfer. Both the third and fourth chamfers are arc-shaped chamfers; however, in other embodiments, the third and fourth chamfers can also be beveled. It is understood that during assembly of the composite retaining ring 100, the first ring 110 is first milled to form the second cut 112, and then the first ring 110 is compressed radially to facilitate the fitting of the second ring 120 onto its exterior. When the second ring 120 and the first ring 110 mate, a tool is inserted into the second cut 112 to cut the second ring 120 radially to form the first cut 122. Understandably, during the process of the tool extending from the inside of the first ring body 110 into the second cut 112, the third and fourth chamfers serve as guides for the tool.

[0069] Example 4:

[0070] Reference Figure 4 The first incision 122 and the second incision 112 work together to form an incision assembly 130. It can be understood that the first incision 122 and the second incision 112 together form a larger incision, which is defined as the incision assembly 130. Combined with... Figure 4 and Figure 5The composite retaining ring 100 includes a first cut surface 131 and a second cut surface spaced apart from and opposite to the first cut surface 131. The cut assembly 130 is formed between the first cut surface 131 and the second cut surface. The two ends of the first snap-fit ​​portion 111 extend to the first cut surface 131 and the second cut surface, respectively. The two ends of the second snap-fit ​​portion 121 also extend to the first cut surface 131 and the second cut surface, respectively.

[0071] like Figure 5 As shown, the first cut surface 131 is provided with a first adhesive groove 132 surrounding the buckle. Thus, when the second ring body 120 is fastened to the first ring body 110, the first adhesive can be injected into the first adhesive groove 132, thereby making the second ring body 120 and the first ring body 110 fit more tightly. In addition, it can also restrict the relative movement of the second ring body 120 and the first ring body 110 along the circumference of the composite retaining ring 100.

[0072] Furthermore, the second cut surface also has a second adhesive groove surrounding the buckle, and a second adhesive is disposed within the second adhesive groove. This further improves the connection reliability between the second ring 120 and the first ring 110.

[0073] Example 5:

[0074] like Figure 6 As shown, the difference between Example 5 and Example 1 is that:

[0075] The cross-section of the second snap-fit ​​portion 121 (the plane where the central axis of the composite retaining ring 100 is located) is an inclined rectangular structure, and correspondingly, the cross-section of the first snap-fit ​​portion 111 is also an inclined rectangular groove structure.

[0076] Example 6:

[0077] like Figure 7 As shown, the difference between Example 6 and Example 1 is that:

[0078] The cross-section of the second snap-fit ​​part 121 (the plane where the central axis of the composite retaining ring 100 is located) is a dovetail structure, and correspondingly, the cross-section of the first snap-fit ​​part 111 is also a dovetail groove structure.

[0079] Example 7:

[0080] like Figure 8 As shown, the difference between Example 7 and Example 1 is that:

[0081] The cross-section of the second snap-fit ​​part 121 (the plane where the central axis of the composite retaining ring 100 is located) is a sinusoidal structure, and correspondingly, the cross-section of the first snap-fit ​​part 111 is also a sinusoidal groove structure.

[0082] It should be noted that the above embodiments only describe the structure of the composite retaining ring 100 having two rings. Of course, in other embodiments, the composite retaining ring 100 may have three or more rings.

[0083] Example 8

[0084] like Figure 9 As shown, Embodiment 8 of this utility model relates to a sealing structure, including a sealing component 200 and a composite retaining ring 100 as described in the above embodiments.

[0085] Specifically, the sealing structure is used to seal the gap between the cylinder 300 and the shaft 400. The sealing component 200 is sleeved on the outside of the shaft 400 and is sealed between the inner wall of the cylinder 300 and the outer wall of the shaft 400. The composite retaining ring 100 is also sleeved on the outside of the shaft 400 and is located inside the cylinder 300. There are two composite retaining rings 100, which are respectively arranged on both sides of the sealing component 200 along the axial direction of the sealing component 200. The composite retaining rings 100 can reduce the risk of the sealing component 200 being squeezed into the gap between the cylinder 300 and the shaft 400.

[0086] In this sealing structure, the first ring 110 is softer than the second ring 120, and the sealing assembly 200 includes a rubber ring 210 sleeved on the shaft 400 and a sealing strip 220 sleeved on the rubber ring 210.

[0087] Of course, in other embodiments, the composite retaining ring 100 may also be a single composite retaining ring 100 disposed on one side of the sealing assembly 200 along the axial direction of the sealing assembly 200 and located on the non-pressure side of the sealing assembly 200.

[0088] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0089] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A composite retainer, characterized by, include: The first ring body has a first snap-fit ​​portion on its outer side wall; The second ring body has a second snap-fit ​​part on its inner sidewall. The second ring body is fitted over the first ring body, and the second snap-fit ​​part snaps into the first snap-fit ​​part. Among them, one of the first latching part and the second latching part is a latching groove, and the other is a latch; When the first snap-fit ​​part is the buckle, the first snap-fit ​​part and the first ring body are integrally formed; when the second snap-fit ​​part is the buckle, the second snap-fit ​​part and the second ring body are integrally formed.

2. The composite retainer ring of claim 1, wherein, The first snap-fit ​​part is a ring structure and is coaxially arranged with the first ring body, and the second snap-fit ​​part is a ring structure and is coaxially arranged with the second ring body.

3. The composite retainer ring of claim 1, wherein, Define the outer diameter of the first ring as d1, the inner diameter of the first ring as d2, the outer diameter of the second ring as D1, and the inner diameter of the second ring as D2; When D1-D2>d1-d2, the first snap-fit ​​part is the buckle, and the second snap-fit ​​part is the slot. When D1-D2 < d1-d2, the first snap-fit ​​part is the slot, and the second snap-fit ​​part is the buckle.

4. The composite retainer ring of claim 1, wherein, The second ring body has a first cut, which extends from the outer side wall of the second ring body toward the inner side wall of the second ring body, and the first cut cuts off the second ring body; The first ring body has a second cut, which extends from the outer side wall of the first ring body toward the inner side wall of the first ring body, and the second cut cuts off the first ring body; The second cut is opposite to and connected to the first cut.

5. The composite retainer ring of claim 4, wherein, The direction in which the first cut extends from the outer wall of the second ring to the inner wall of the second ring is the same as the direction in which the second cut extends from the outer wall of the first ring to the inner wall of the first ring.

6. The composite retainer ring of claim 5 wherein, The first cut and the second cut cooperate to form a cut assembly. The composite retaining ring has a first cut surface and a second cut surface that is spaced apart from and opposite to the first cut surface. The cut assembly is formed between the first cut surface and the second cut surface. Both ends of the first snap-fit ​​portion and both ends of the second snap-fit ​​portion extend to the first cut surface and the second cut surface, respectively. The first cut surface is provided with a first adhesive groove surrounding the buckle. A first adhesive is provided in the first adhesive groove.

7. The composite retaining ring according to claim 6, characterized in that, The second cut surface is provided with a second adhesive groove surrounding the buckle, and a second adhesive is provided in the second adhesive groove.

8. The composite retainer ring of claim 4 wherein, The material of the first ring is softer than the material of the second ring. The end of the first cut near the outer wall of the second ring has a first edge and a second edge that are arranged opposite to each other and spaced apart. The first edge has a first chamfer, and the second edge has a second chamfer. Alternatively, the material of the second ring is softer than the material of the first ring. The end of the second cut near the inner wall of the first ring has a third edge and a fourth edge that are arranged opposite to each other and spaced apart. The third edge has a third chamfer, and the fourth edge has a fourth chamfer.

9. The composite retainer of claim 1 wherein, The number of first snap-fit ​​parts is multiple, and the multiple first snap-fit ​​parts are spaced apart along the thickness direction of the first ring body; the number of second snap-fit ​​parts is multiple, and the multiple second snap-fit ​​parts are spaced apart along the thickness direction of the second ring body; Each of the first snap-fit ​​parts is snapped into one of the second snap-fit ​​parts.

10. A seal structure, characterized by, include: Sealing components; The composite retaining ring according to any one of claims 1 to 9, wherein the composite retaining ring is disposed on one side of the sealing assembly along the axial direction of the sealing assembly.

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