Dust seal ring for high speed compressor

Abstract

A dustproof sealing ring for high-speed compressor, comprising: a dustproof shaft sleeve provided with a first inner hole for the compressor input shaft to pass through; a dustproof outer sleeve sleeved outside the dustproof shaft sleeve and provided with a first outer circle matched with the compressor box; and a dustproof gland locked with the dustproof shaft sleeve, the dustproof gland being provided with a second inner hole, the end of the second inner hole being in a conical surface structure and partially extending into the first inner hole to form a conical surface cooperation with the dustproof shaft sleeve; by locking the dustproof gland with the dustproof shaft sleeve, the conical surface cooperation drives the second inner hole to contract radially inward, thereby forming a close connection with the compressor input shaft, so that the compressor input shaft can drive the dustproof shaft sleeve to rotate synchronously. A multiple sealing system composed of a dustproof shaft sleeve inner hole sealing ring (dynamic sealing), a dustproof outer sleeve tail end interference sealing (radial static sealing) and a dustproof outer sleeve outer circle sealing ring (static sealing) is formed, and the dustproof sealing effect is remarkable.

Description

Technical Field

[0001] This utility model relates to the field of compressor parts technology, specifically to a dustproof sealing ring for high-speed compressors. Background Technology

[0002] As a core piece of equipment in modern industry, the high-speed compressor's input shaft dust seal ring is a small but crucial component. Its primary function is to establish a reliable barrier, protecting the compressor's internal components from external damage and preventing internal lubricant leakage. This is the seal ring's most fundamental and important function. The compressor input shaft needs to rotate at high speed, inevitably creating a tiny gap between the shaft and the compressor housing. Without a seal, various external contaminants would enter the compressor through this gap.

[0003] The ability to reduce lubricating oil leakage under high-speed input shaft operation determines the service life of a high-speed compressor. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a dustproof sealing ring for high-speed compressors.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A dustproof sealing ring for a high-speed compressor, comprising: A dustproof bushing has a first inner hole through which the compressor input shaft passes; A dustproof cover is fitted over the outside of the dustproof bushing and has a first outer circle that mates with the compressor housing; A dustproof cap, which is locked to a dustproof bushing, has a second inner hole. The end of the second inner hole is tapered and partially extends into the first inner hole, forming a tapered fit with the dustproof bushing. By locking the dustproof cover and the dustproof bushing, the conical surface engagement drives the second inner hole to radially contract inward, thereby forming a tight connection with the compressor input shaft, enabling the compressor input shaft to drive the dustproof bushing to rotate synchronously.

[0006] The inner wall of the first inner hole is provided with at least one first sealing ring.

[0007] At least one second sealing ring is provided on the outer side of the first outer circle.

[0008] The outer circumferential surface of the dustproof bushing is provided with an annular groove extending in the circumferential direction, and the inner side of the dustproof outer sleeve is provided with an anti-detachment protrusion that matches the annular groove.

[0009] The tail end of the dustproof jacket is bent inward and radially to form a tail end sealing structure that is interference-fitted with the dustproof bushing. The interference amount on one side of the interference fit is 0.4mm to 0.5mm.

[0010] The outer circular end face of the dustproof jacket is provided with an anti-rotation pin groove, which is used to cooperate with the anti-rotation pin on the compressor housing.

[0011] The left end face of the dustproof cover is provided with a screw locking groove.

[0012] The dustproof outer jacket is made of polytetrafluoroethylene, and the dustproof bushing and dustproof cover are made of stainless steel.

[0013] The dustproof cover and the dustproof bushing are fixedly connected by several locking screws.

[0014] The beneficial effects of this invention are as follows: The conical surface of the dustproof cap engages and locks securely, ensuring reliable power transmission to the dustproof bushing; simultaneously, the dustproof outer sleeve remains stationary, effectively separating the rotating and stationary components. This forms a multi-layered sealing system consisting of an inner hole sealing ring (dynamic seal) of the dustproof bushing, an interference seal at the tail end of the dustproof outer sleeve (radial static seal), and an outer circular sealing ring of the dustproof outer sleeve (static seal), resulting in a significant dustproof sealing effect. Attached Figure Description

[0015] Figure 1 This is a cross-sectional schematic diagram of the present invention.

[0016] Figure 2 This is a cross-sectional schematic diagram of the application of this utility model to a compressor.

[0017] Figure 3 This is a schematic diagram of the structure of this utility model.

[0018] Figure 4 This is a cross-sectional schematic diagram of the dustproof jacket of this utility model.

[0019] Figure 5 This is a cross-sectional schematic diagram of the dustproof bushing of this utility model.

[0020] Figure 6 This is a cross-sectional schematic diagram of the dustproof cover of this utility model. Detailed Implementation

[0021] 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 embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0023] like Figure 1 , Figure 2 and Figure 3 As shown, this utility model discloses a dustproof sealing ring for a high-speed compressor, which includes a dustproof bushing 2, a dustproof outer sleeve 1, and a dustproof pressure cap 3.

[0024] like Figure 4 As shown, the dustproof bushing 2 is typically made of metal, but in this embodiment, it is made of stainless steel. It has a central first inner hole 21 through which the compressor input shaft 11 passes. One or two first grooves 23 are formed on the inner wall of the first inner hole 21, and a first sealing ring 4, which is an O-ring, is provided within each groove to fit against the surface of the compressor input shaft and form a rotary dynamic seal. An annular groove 22 is machined on the outer circumferential surface of the dustproof bushing 2.

[0025] like Figure 5 As shown, the dustproof jacket 1 is preferably integrally formed from black polytetrafluoroethylene (PTFE) material through machining. It is fitted onto the outside of the dustproof bushing 2 and has a first outer circle 13 that mates with the compressor housing 31. Its inner wall has anti-detachment protrusions 14 that fit into the annular groove 22. During assembly, the dustproof jacket 3 is fitted onto the outside of the dustproof bushing 2, causing the anti-detachment protrusions 14 to engage with the annular groove 22, forming an axial limit. The inner diameter of the dustproof jacket 1 on both sides of the anti-detachment protrusions 14 is slightly larger than the outer diameter of the dustproof bushing 2, forming a small radial gap to prevent seizing. A second groove 16 is formed on the first outer circle 13 of the dustproof jacket 1 for installing the second sealing ring 5, which mates with the hole in the compressor housing to achieve a static seal.

[0026] like Figure 6 As shown, the dustproof cover 3 is usually made of metal, but in this embodiment it is made of stainless steel. It is locked to the left end of the dustproof bushing 2 by a locking screw, wherein the left and right sides are as follows: Figure 1As shown in the product diagram, the left side of the figure is the left side mentioned in this embodiment. The dustproof cover 3 is provided with a second inner hole 32. The end of the second inner hole 32 is a conical structure 33, which extends into the first inner hole 21. That is, the end of the conical structure extends into the end of the first inner hole. At the same time, the end of the first inner hole is preferably set as a sloped structure 24, which forms a conical fit with the dustproof bushing 2. By locking the dustproof cover 3 and the dustproof bushing 2, the conical fit drives the second inner hole 32 to shrink radially inward, thereby forming a tight connection with the compressor input shaft 11, so that the compressor input shaft 11 can drive the dustproof bushing 2 to rotate synchronously.

[0027] The tail end of the dustproof outer sleeve 1 is bent inward radially by a process. The inner diameter of this structure is slightly smaller than the outer diameter of the corresponding position of the dustproof bushing, forming a tail end sealing structure 15 that is interference-fitted with the dustproof bushing. The interference amount on one side of the interference fit is 0.4mm to 0.5mm, forming a tight radial seal.

[0028] The dustproof jacket 1 has an anti-rotation pin groove 12 on its outer circular end face, which is used to cooperate with the anti-rotation pin 7 on the compressor housing 31. During assembly, it engages with the anti-rotation pin 7 on the housing to prevent the jacket from rotating.

[0029] The dustproof cover 1 has a screw-locking groove 17 on its left end face. This groove is used to avoid the locking screw and prevent the cover from being locked by it.

[0030] After assembly, the input shaft, dustproof bushing, and dustproof cover are locked together as a single unit via a conical locking mechanism, rotating at high speed with the shaft. The first sealing ring on the dustproof bushing provides a rotational seal to the shaft. The dustproof outer sleeve is secured by an anti-rotation pin groove, maintaining absolute stillness. The second sealing ring on its first outer circumference provides a static seal to the housing, and the tail-end sealing structure forms a radial friction seal with the rotating dustproof bushing. The anti-detachment protrusion and the annular groove work together to ensure that the dustproof outer sleeve will not axially detach at high speeds. The entire system achieves effective isolation and multi-layered sealing between rotating and stationary components, specifically designed for harsh operating conditions such as high-speed compressors.

[0031] Because a lubricating oil film exists between the dust seal ring and the input shaft, this film exhibits fluid lubrication characteristics. Under the influence of liquid surface tension, the stiffness of the lubricating oil film precisely creates a meniscus at the point of contact with the air, preventing leakage of the working medium and thus achieving a seal on the input shaft. The sealing capacity of the dust seal ring depends on the interference fit between the dust cover and the dust shaft sleeve. If the interference fit is too small, the oil seal will leak; if the interference fit is too large, dry friction may occur, causing wear on both the dust seal ring and the input shaft.

[0032] Therefore, during installation, ensure that the dustproof sealing ring is perpendicular to the input shaft axis. During operation, a slight seepage of lubricating oil from the housing is ideal, forming an oil film at the sealing surface.

[0033] The embodiments should not be regarded as limitations on the present invention, but any improvements made based on the spirit of the present invention should be within the protection scope of the present invention.

Claims

1. A dustproof sealing ring for a high-speed compressor, characterized in that: It includes: Dustproof bushing (2) has a first inner hole (21) through which the compressor input shaft (11) passes. A dustproof jacket (1) is fitted on the outside of the dustproof bushing (2) and has a first outer circle (13) that mates with the compressor housing (31). A dustproof cap (3) is locked to a dustproof bushing (2). The dustproof cap (3) has a second inner hole (32). The end of the second inner hole (32) is a conical structure (33) and partially extends into the first inner hole (21), forming a conical fit with the dustproof bushing (2). By locking the dustproof cover (3) and the dustproof bushing (2), the conical surface engages to drive the second inner hole (32) to contract radially inward, thereby forming a tight connection with the compressor input shaft (11), so that the compressor input shaft (11) can drive the dustproof bushing (2) to rotate synchronously.

2. The dustproof sealing ring for a high-speed compressor according to claim 1, characterized in that: The inner wall of the first inner hole (21) is provided with at least one first sealing ring (4).

3. A dustproof sealing ring for a high-speed compressor according to claim 1, characterized in that: At least one second sealing ring (5) is provided on the outer side of the first outer circle (13).

4. A dustproof sealing ring for a high-speed compressor according to claim 1, characterized in that: The outer circumferential surface of the dustproof bushing (2) is provided with an annular groove (22) extending in the circumferential direction, and the inner side of the dustproof outer sleeve (1) is provided with an anti-detachment protrusion (14) that matches the annular groove (22).

5. A dustproof sealing ring for a high-speed compressor according to claim 1, characterized in that: The tail end of the dustproof jacket (1) is bent inward and radially to form a tail end sealing structure (15) that is interference fit with the dustproof bushing. The interference fit on one side is 0.4 mm to 0.5 mm.

6. A dustproof sealing ring for a high-speed compressor according to claim 1, characterized in that: The dustproof jacket (1) has an anti-rotation pin groove (12) on its outer circular end face, which is used to cooperate with the anti-rotation pin (7) on the compressor housing (31).

7. A dustproof sealing ring for a high-speed compressor according to claim 1, characterized in that: The dustproof cover (1) has a screw-locking groove (17) on the left end face.

8. A dustproof sealing ring for a high-speed compressor according to any one of claims 1 to 7, characterized in that: The dustproof jacket (1) is made of polytetrafluoroethylene, and the dustproof bushing (2) and dustproof cover (3) are made of stainless steel.

9. A dustproof sealing ring for a high-speed compressor according to claim 1, characterized in that: The dustproof cover (3) and the dustproof bushing (2) are fixedly connected by several locking screws (6).

Images