A dynamic seal ring

Abstract

The utility model relates to the technical field of sealing, specifically relates to a dynamic sealing ring, sealing main part and outer expansion main body, the sealing main part is set on the outside of outer expansion main body, the outer expansion main body is coaxial with sealing main part and is set, and the outer expansion main body is connected with sealing main part, the sealing main part is set on the outside of outer expansion main body, and is matched with the assembly groove on the shaft piece in the use process, under the rotating working condition of shaft piece, the sealing main part expands outward with the help of centrifugal force and is pasted with the seat hole, realizes the rotating sealing demand, when the shaft piece rotates and moves axially, the side wall of assembly groove pushes sealing main part and moves, sealing main part and assembly groove side wall are pasted and realize sealing at this moment, and the outer expansion main body supports the outer expansion of sealing main part, makes sealing main part outer ring end surface and seat hole close contact, avoids oil leakage, satisfies the dynamic sealing demand of shaft piece.

Description

Technical Field

[0001] This utility model relates to the field of sealing technology, specifically to a dynamic sealing ring. Background Technology

[0002] Dynamic sealing refers to the technology of sealing between moving parts and stationary parts of mechanical equipment. Its main purpose is to prevent fluid leakage and reduce friction and wear. It is widely used in various industrial equipment, such as pumps, compressors, engines, transmissions, and hydraulic systems.

[0003] For rotating conditions, for example, Chinese utility model patent with announcement number CN219932951U provides a rotating shaft seal in which the inner lip of the V-shaped sealing ring contacts and seals with the rotating shaft, and the outer lip of the V-shaped sealing ring contacts and seals with the side wall of the inner cavity; however, under reciprocating motion conditions, the installation position of the rotating shaft seal is prone to displacement, leading to seal failure.

[0004] For reciprocating motion conditions, such as the Chinese utility model patent with announcement number CN222185057U, a reciprocating compressor rear cover seal is provided. The outer wall of the rear cover is provided with a partition, and shaft seals connected to the crankshaft are provided on both sides of the partition. An air inlet is provided on the partition, and a fixing component is provided on the outside of the partition. Compressed air fills the space formed by the partition and the crankshaft to achieve reciprocating sealing. However, under the condition of shaft rotation, the existing sealing structure suffers from increased friction with the shaft, resulting in increased loss and thus reduced sealing effect.

[0005] Therefore, for transmission control in situations where the shaft rotates while the transmission is controlled by oil circuit to move the shaft along its axial direction, the existing sealing structure cannot simultaneously meet the requirements of rotary sealing and reciprocating sealing of the shaft. Utility Model Content

[0006] The purpose of this invention is to provide a dynamic sealing ring to solve the technical problem of poor sealing effect of rotating and reciprocating shafts.

[0007] The solution of this utility model to the above-mentioned technical problems is as follows:

[0008] A dynamic sealing ring includes a sealing body and an expanding body. The sealing body is sleeved on the outside of the expanding body. The expanding body and the sealing body are coaxially arranged and connected.

[0009] Further specifying, the sealing body is a PTFE sealing ring.

[0010] Further specifying, a first oil groove is provided on the outer end face of the sealing body, and the first oil groove is coaxially arranged with the sealing body.

[0011] Further defined, the first oil groove is provided with a plurality of lubricating oil holes, which are opened along the radial direction of the sealing body; the plurality of lubricating oil holes are arranged circumferentially around the axis of the sealing body; the bottom end of the lubricating oil holes extends to connect with the outer ring of the outer expansion body.

[0012] Further specified, the sealing body has a plurality of lubricating oil grooves on its annular end face, the lubricating oil grooves are opened along the radial direction of the sealing body, one end of the lubricating oil groove is flush with the outer ring end face of the sealing body, and the other end of the lubricating oil groove is flush with the inner ring end face of the sealing body; the plurality of lubricating oil grooves are arranged circumferentially around the axis of the sealing body.

[0013] Further specifying, the sealing body includes a PTFE sealing strip and L-shaped fasteners respectively disposed at the left and right ends of the PTFE sealing strip, the PTFE sealing strip being bent and connected at the left and right ends to form a ring structure.

[0014] Further, the inner ring end face of the sealing body is provided with an embedding groove, and the outer expansion body is disposed in the embedding groove.

[0015] Furthermore, an assembly chamfer is provided between the outer ring end face of the outer expansion body and the annular end face of the outer expansion body.

[0016] Furthermore, the outer expansion body has a C-shaped structure.

[0017] Further specifying, the outer expansion body is a stainless steel expansion ring.

[0018] The beneficial effects of this utility model are as follows:

[0019] 1. This utility model involves sleeved sealing body on the outside of expansion body, which cooperates with the assembly groove on the shaft during use. When the shaft rotates, the sealing body expands outward with the help of centrifugal force to fit into the seat hole, thus achieving the rotational sealing requirement. When the shaft rotates and moves axially, the side wall of the assembly groove pushes the sealing body to move. At this time, the sealing body fits into the side wall of the assembly groove to achieve sealing, while the expansion body supports the expansion of the sealing body, so that the outer ring end face of the sealing body is in close contact with the seat hole, avoiding oil leakage and meeting the dynamic sealing requirements of the shaft.

[0020] 2. This utility model uses a PTFE sealing ring and a stainless steel expansion ring to ensure dynamic sealing of the shaft while improving service life and meeting actual dynamic sealing requirements. At the same time, the PTFE sealing ring is formed by bending a PTFE sealing strip and connecting it with an L-shaped buckle, which facilitates connection with the assembly groove on the shaft and cooperates with the outer expansion body to improve the reliability of the seal between the sealing body and the seat hole.

[0021] 3. This utility model has a lubricating oil hole and a lubricating oil groove on the sealing body. During the rotation of the sealing body, an oil film is formed, which reduces friction, increases service life, and further improves the sealing effect.

[0022] 4. This utility model reduces assembly difficulty by creating an assembly chamfer on the outer body, while avoiding interference with the rounded corner at the bottom of the embedding groove, thus improving assembly reliability and further enhancing the dynamic sealing effect of the shaft. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the dynamic sealing ring of this utility model;

[0024] Figure 2 This is a schematic diagram of an application environment for the dynamic sealing ring of this utility model;

[0025] Figure 3 This is a schematic cross-sectional view of the dynamic sealing ring of this utility model;

[0026] Figure 4 for Figure 3 Enlarged diagram of part A in the middle;

[0027] Figure 5 This is a schematic diagram of the overall structure of the extended main body of this utility model;

[0028] Figure 6 for Figure 2 Enlarged diagram of section B;

[0029] In the figure, 10-sealing body; 11-L-shaped buckle; 12-embedding groove; 20-outer expansion body; 21-assembly chamfer; 30-first oil groove; 31-lubricating oil hole; 32-lubricating oil groove; 40-shaft; 41-spline; 42-end tooth; 43-first assembly groove; 44-second assembly groove; 50-seat hole; 51-first seat hole; 52-second seat hole; 60-oil passage hole; 61-drive oil chamber. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0031] Example 1

[0032] refer to Figures 1-4This utility model provides a dynamic sealing ring, including a sealing body 10 and an outer expansion body 20. The sealing body 10 is connected to the outer expansion body 20, and the sealing body 10 is sleeved on the outside of the outer expansion body 20. The sealing body 10 is preferably made of wear-resistant material to improve service life. The outer expansion body 20 is preferably made of elastic material to compress the sealing body 10 from the inside out.

[0033] refer to Figure 2 During use, the sealing body 10 is sleeved on the shaft 40, and the shaft 40 is set in the seat hole. The shaft 40 is provided with an assembly groove as required. Taking the first assembly groove 43 as an example, the sealing body 10 is set in the first assembly groove 43, and the shaft 40 achieves dynamic sealing with the first seat hole 51 through the sealing body 10.

[0034] Specifically, the outer expansion body 20 supports the sealing body 10, so that the outer ring end face of the sealing body 10 is in close contact with the inner wall of the first seat hole 51; when the shaft 40 rotates, it drives the sealing body 10 to rotate, and the sealing body 10 further squeezes the inner wall of the first seat hole 51 under the action of centrifugal force, thereby ensuring the rotational sealing of the shaft 40 and preventing oil leakage through the sealing body 10.

[0035] In order to reduce friction between the sealing body 10 and the first seat hole 51, thereby improving service life, the sealing body 10 is preferably a PTFE sealing ring.

[0036] refer to Figure 3 and Figure 4 Further preferably, a first oil groove 30 is formed on the outer ring end face of the sealing body 10. The first oil groove 30 is coaxially arranged with the sealing body 10. The cross-sectional shape of the first oil groove 30 parallel to the axis can be rectangular, trapezoidal or arc, preferably arc.

[0037] Further preferably, a plurality of lubricating oil holes 31 are formed on the first oil groove 30. The plurality of lubricating oil holes 31 are arranged circumferentially around the axis of the sealing body 10. Preferably, the plurality of lubricating oil holes 31 are evenly distributed around the axis of the sealing body 10. The lubricating oil holes 31 are formed radially along the sealing body 10. The lubricating oil holes 31 can be selected as through holes or blind holes. The following is an example in which the top end of the lubricating oil hole 31 is connected to the first oil groove 30 and the bottom end of the lubricating oil hole 31 is connected to the outer ring end face of the outer expansion body 20.

[0038] By filling the first oil groove 30 with lubricating oil, the friction between the sealing body 10 and the first seat hole 51 can be reduced. At the same time, the sealing body 10 can form an oil film during rotation, which further improves the sealing effect between the sealing body 10 and the first seat hole 51 and ensures reliable sealing of the shaft 40 during rotation.

[0039] When the shaft 40 reciprocates along its axial direction, the side wall of the first assembly groove 43 presses against the annular end face of the sealing body 10, and the two come into close contact to form a seal.

[0040] Meanwhile, since the shaft 40 continues to rotate, in order to reduce the frictional loss between the annular end face of the sealing body 10 and the side end face of the first assembly groove 43, it is preferable to open a plurality of lubricating oil grooves 32 on the annular end face of the sealing body 1. The lubricating oil grooves 32 are also opened along the radial direction of the sealing body 10. The top end of the lubricating oil grooves 32 is flush with the outer ring end face of the sealing body 10, and the bottom end of the lubricating oil grooves 32 is flush with the inner ring end face of the sealing body 10. The plurality of lubricating oil grooves 32 are arranged circumferentially around the axis of the sealing body 10, and preferably the plurality of lubricating oil grooves 32 are evenly distributed around the axis of the sealing body 10.

[0041] This allows the sealing body 10 to form an oil film between the lubricating oil groove 32 and the first assembly groove 43 during rotation, reducing friction loss and further improving the sealing effect and service life, thereby meeting the dynamic sealing requirements of the rotation and movement of the shaft 40.

[0042] To further explain, since the sealing body 10 needs to be set in the first assembly groove 43 of the shaft 40, the inner diameter of the sealing body 10 needs to be smaller than the outer diameter of the corresponding position of the shaft 40. Therefore, in order to facilitate assembly, it is preferable to form the sealing body 10 by bending the PTFE sealing strip to connect its two ends. During assembly, the PTFE sealing strip is bent around the first assembly groove 43 and then the two ends are connected to complete the assembly. The operation is simple, reducing the assembly difficulty and improving the disassembly and assembly efficiency.

[0043] Preferably, L-shaped buckles 11 are provided at both ends of the PTFE sealing strip. After the PTFE sealing strip is bent, it is engaged by the two L-shaped buckles 11 to form a PTFE sealing ring, so that the PTFE sealing strip maintains a circular shape under the constraint of the first seat hole 51. At the same time, during the rotation sealing process, the PTFE sealing ring can squeeze the first seat hole 51 under the action of centrifugal force through the movable allowance of the L-shaped buckles 11, and can also squeeze the first seat hole 51 under the support of the outward expansion column head 20, thereby improving the sealing effect.

[0044] refer to Figure 5 To further explain, in order to ensure reliable compression support of the outer expansion body 20 to the sealing body 10, the outer expansion body 20 is preferably selected as a C-shaped structure. The outer expansion body 20 can be selected as a stainless steel expansion ring, which is low in cost and has good processability. At this time, the C-shaped opening of the outer expansion body 20 faces the two overlapping L-shaped buckles 11.

[0045] refer to Figure 4 and Figure 5In order to ensure a stable and reliable connection between the outer expansion body 20 and the sealing body 10, it is preferable to open an embedding groove 12 on the inner end face of the sealing body 10. The embedding groove 12 is also a C-shaped structure. The outer expansion body 20 is embedded in the embedding groove 12 to provide reliable support for the sealing body 10. At the same time, the sealing body 10 is subjected to more uniform force under the connection of the L-shaped buckle 11, which improves the dynamic sealing effect.

[0046] Preferably, since the bottom corner of the embedding groove 12 is usually rounded during the processing, in order to improve the assembly reliability of the sealing body 10 and the embedding groove 12, it is preferable to chamfer the sealing body 10, that is, to set an assembly chamfer 21 between the outer ring end face of the sealing body 10 and the corresponding ring end face.

[0047] Working principle:

[0048] refer to Figure 2 and Figure 6 The seat hole 50 remains fixed during operation. The seat hole 50 has stepped holes, namely the first seat hole 51 and the second seat hole 52. The inner diameter of the second seat hole 52 is larger than the inner diameter of the first seat hole 51. The seat hole 50 also has an oil passage hole 60, which is connected to the first seat hole 51.

[0049] The input section of the shaft 40 is provided with a spline 41, and the output section of the shaft 40 is provided with an end tooth 42. The first seat hole 51 is sleeved on the outside of the input section of the shaft 40, and the second seat hole 52 is sleeved on the outside of the output section of the shaft 40. A concave ring is provided between the input section and the output section of the shaft 40. The concave ring and the first seat hole 51 form a driving oil cavity 61, which is connected to the oil passage hole 60.

[0050] During the rotation of the shaft 40, when the high-pressure oil in the oil passage 60 is injected into the drive oil chamber 61, it pushes the shaft 40 to move to the right, so that the end teeth 42 mesh with the corresponding transmission components to achieve transmission.

[0051] A first assembly groove 43 is opened near the port of the input section of the shaft 40, and a second assembly groove 44 is opened near the end tooth 42 of the output section of the shaft 40. Dynamic sealing rings of corresponding sizes are provided in both the first assembly groove 43 and the second assembly groove 44 to achieve sealing of the oil in the drive oil chamber 61, thereby enabling the shaft 40 to operate reliably.

[0052] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of this utility model.

Claims

1. A dynamic sealing ring, characterized in that, It includes a sealing body (10) and an outer expansion body (20). The sealing body (10) is sleeved on the outside of the outer expansion body (20). The outer expansion body (20) and the sealing body (10) are coaxially arranged and connected.

2. The dynamic sealing ring according to claim 1, characterized in that, The sealing body (10) is a PTFE sealing ring.

3. The dynamic sealing ring according to claim 1, characterized in that, The sealing body (10) has a first oil groove (30) on its outer ring end face, and the first oil groove (30) is coaxially arranged with the sealing body (10).

4. The dynamic sealing ring according to claim 3, characterized in that, The first oil groove (30) is provided with a plurality of lubricating oil holes (31), which are opened along the radial direction of the sealing body (10); the plurality of lubricating oil holes (31) are arranged circumferentially around the axis of the sealing body (10); the bottom end of the lubricating oil hole (31) extends to connect with the outer ring of the outer expansion body (20).

5. The dynamic sealing ring according to claim 1, characterized in that, The sealing body (10) has a plurality of lubricating oil grooves (32) on its annular end face. The lubricating oil grooves (32) are opened along the radial direction of the sealing body (10). One end of the lubricating oil groove (32) is flush with the outer ring end face of the sealing body (10), and the other end of the lubricating oil groove (32) is flush with the inner ring end face of the sealing body (10). The plurality of lubricating oil grooves (32) are arranged circumferentially around the axis of the sealing body (10).

6. The dynamic sealing ring according to any one of claims 3 to 5, characterized in that, The sealing body (10) includes a PTFE sealing strip and L-shaped buckles (11) respectively set at the left and right ends of the PTFE sealing strip. The PTFE sealing strip is bent and connected by the L-shaped buckles (11) at the left and right ends to form a ring structure.

7. The dynamic sealing ring according to claim 1, characterized in that, The inner ring end face of the sealing body (10) is provided with an embedding groove (12), and the outer expansion body (20) is disposed in the embedding groove (12).

8. The dynamic sealing ring according to claim 7, characterized in that, An assembly chamfer (21) is provided between the outer ring end face of the outer expansion body (20) and the annular end face of the outer expansion body (20).

9. The dynamic sealing ring according to claim 1, characterized in that, The outer expansion body (20) has a C-shaped structure.

10. The dynamic sealing ring according to claim 9, characterized in that, The outer expansion body (20) is a stainless steel expansion ring.

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