Sealing device for extending shaft of compressor and air compressor comprising sealing device

Abstract

The utility model discloses a compressor projecting shaft sealing device and an air compressor comprising the same, the compressor projecting shaft sealing device comprises a rotating shaft, a casing, a bearing and a shaft seal oil leakage prevention structure, the shaft seal oil leakage prevention structure and the bearing are both sleeved on the rotating shaft; the shaft seal oil leakage prevention structure comprises a shaft seal cover, an oil baffle plate and a shaft seal, the shaft seal cover is connected to the machine shell, the shaft seal and the oil baffle plate are both located in the shaft seal cover, and the oil baffle plate is located between the shaft seal and the bearing. The air compressor comprises the compressor extension shaft sealing device. The oil baffle plate is arranged between the shaft seal and the bearing, so that the shaft seal can avoid splashing impact of lubricating oil of the bearing, the oil leakage hidden danger of the shaft seal is reduced, the service life of the shaft seal is effectively prolonged, and the stability is high; meanwhile, the overall structure is simple, and cost is low.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of compressor extension shaft sealing device and air compressor comprising it. BACKGROUND

[0002] At present on the market, the rotating shaft of screw air compressor generally adopts shaft seal, which belongs to contact seal. The material of shaft seal is generally plastic PTFE, which is easy to deform and has poor stability. At the same time, due to cost consideration, the distance between shaft seal and bearing is short, and a large amount of bearing lubricating oil splashes and impacts the shaft seal, which causes oil leakage of the shaft seal and shortens its service life. In the original assembly process, the shaft seal is pressed, which may cause eccentricity between the rotating shaft and the shaft seal, thereby causing oil leakage of the shaft seal. SUMMARY

[0003] The utility model aims at overcoming the above-mentioned deficiencies, and provides a kind of compressor extension shaft sealing device and air compressor comprising it.

[0004] The utility model is realized by the following technical solutions:

[0005] A kind of compressor extension shaft sealing device, comprising rotating shaft, shell, bearing and anti-oil leakage structure of shaft seal, the anti-oil leakage structure of shaft seal and the bearing are all set in the rotating shaft, and the bearing is located between the shell and the rotating shaft, the anti-oil leakage structure of shaft seal includes shaft seal cover, oil baffle and shaft seal, the shaft seal cover is connected to the shell, the shaft seal and the oil baffle are all located in the shaft seal cover, and the oil baffle is located between the shaft seal and the bearing.

[0006] Further, the anti-oil leakage structure of shaft seal further includes bushing, the bushing is located in the shaft seal cover and set on the outer circumferential surface of the rotating shaft, a sealing cavity is formed between the bushing and the shaft seal cover, and the shaft seal is arranged in the sealing cavity.

[0007] Further, one end of the oil baffle is pressed between the bushing and the bearing, and the other end of the oil baffle extends outward in a direction away from the bearing.

[0008] Further, the shaft seal cover includes blocking part, sleeve part and flange part, one end of the blocking part is connected to the end of the sleeve part away from the bearing, the other end of the blocking part extends inward along the radial direction of the rotating shaft, so as to form a sealing cavity between the blocking part and the sleeve part, the shaft seal is arranged in the sealing cavity, one end of the flange part is connected to the outer circumferential surface of the sleeve part, and the other end of the flange part extends outward along the radial direction of the rotating shaft and is connected with the shell.

[0009] Further, the inner wall surface of the sleeve portion has a sealing surface and a guide surface, the sealing surface and the guide surface are close to the blocking portion and the oil baffle respectively, and the guide surface is recessed outward along the radial direction of the rotating shaft, so that the shaft seal is pressed to the sealing surface through the guide surface.

[0010] Further, the inner diameter of the guide surface is 0.3mm larger than the outer diameter of the shaft seal.

[0011] Further, the inner wall surface of the sleeve portion has a smooth fillet between the guide surface and the sealing surface.

[0012] Further, the end of the sleeve portion away from the blocking portion is located between the casing and the bearing.

[0013] Further, the number of the shaft seal is two, and the two shaft seals are arranged in the axial direction of the rotating shaft.

[0014] An air compressor comprising the compressor protruding shaft sealing device.

[0015] The compressor protruding shaft sealing device has the advantages that:

[0016] The compressor protruding shaft sealing device and the air compressor comprising the same have the advantages that: the oil baffle is arranged between the shaft seal and the bearing, so that the shaft seal can avoid the splash impact of the bearing lubricating oil, thereby reducing the oil leakage risk of the shaft seal, effectively prolonging the service life of the shaft seal, and being high in stability; meanwhile, the overall structure is simple, and the cost is low. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 FIG. 1 is a structural schematic view of a compressor protruding shaft sealing device according to an embodiment of the present utility model.

[0018] Figure 2 FIG. 2 is a partial internal structure schematic view of the compressor protruding shaft sealing device according to the embodiment of the present utility model.

[0019] Figure 3 FIG. 3 is a partial internal structure schematic view of a shaft seal cover according to the embodiment of the present utility model.

[0020] BRIEF DESCRIPTION OF REFERENCE NUMERALS

[0021] Rotating shaft 1

[0022] Anti-shaft seal oil leakage structure 2

[0023] Shaft seal cover 21

[0024] Flange portion 211

[0025] Sleeve portion 212

[0026] Sealing surface 2121

[0027] Guide surface 2122

[0028] Smooth rounded corners 2123

[0029] Blocking part 213

[0030] Sealed cavity 214

[0031] Shaft seal 22

[0032] Oil baffle 23

[0033] Bushing 24

[0034] Case 3

[0035] Bearing 4 Detailed Implementation

[0036] The following description of the embodiments is with reference to the accompanying drawings, which illustrate specific embodiments in which the present invention can be implemented.

[0037] This embodiment discloses an air compressor, which includes a compressor extension shaft sealing device. For example... Figure 1 , Figure 2 and Figure 3 As shown, the compressor extension shaft sealing device includes a rotating shaft 1, an anti-shaft seal oil leakage structure 2, a housing 3, and a bearing 4. The anti-shaft seal oil leakage structure 2 and the bearing 4 are both sleeved on the rotating shaft 1, and the bearing 4 is located between the housing 3 and the rotating shaft 1. The anti-shaft seal oil leakage structure 2 includes a shaft seal cover 21, a shaft seal 22, and an oil baffle 23. The shaft seal cover 21 is connected to the housing 3. The shaft seal 22 and the oil baffle 23 are both located inside the shaft seal cover 21, and the oil baffle 23 is located between the shaft seal 22 and the bearing 4.

[0038] Bearing 4 is positioned between housing 3 and rotating shaft 1, ensuring the rotational operation of rotating shaft 1. Shaft seal cover 21 is connected to housing 3 and used to fix shaft seal 22 and oil baffle 23, so that oil baffle 23 is located between shaft seal 22 and bearing 4. By positioning oil baffle 23 between shaft seal 22 and bearing 4, during operation, a large amount of high-pressure bearing lubricating oil from bearing 4 splashes onto oil baffle 23 instead of splashing onto shaft seal 22. This allows shaft seal 22 to avoid the impact of splashed bearing lubricating oil, effectively preventing damage to shaft seal 22, thereby reducing the risk of oil leakage from shaft seal 22, effectively extending the service life of shaft seal 22, and achieving high stability of shaft seal 22; at the same time, the overall structure is simple and low in cost.

[0039] The anti-leakage structure 2 of the shaft seal further comprises a bushing 24 located in the shaft seal cover 21 and sleeved on the outer circumferential surface of the rotating shaft 1, a sealing cavity 214 is formed between the bushing 24 and the shaft seal cover 21, and the shaft seal 22 is arranged in the sealing cavity 214. The bushing 24 is sleeved on the outer circumferential surface of the rotating shaft 1 to play a role of gasket, thereby reducing the abrasion, vibration and noise of the rotating shaft 1. The shaft seal 22 is arranged in the sealing cavity 214 formed between the bushing 24 and the shaft seal cover 21 to realize the fixing effect of the shaft seal 22, thereby ensuring that the shaft seal 22 is more stable and reliable in use.

[0040] One end of the oil baffle 23 is pressed between the bushing 24 and the bearing 4, and the other end of the oil baffle 23 extends outward in a direction away from the bearing 4. The two sides of the oil baffle 23 are pressed by the bushing 24 and the bearing 4 respectively, thereby effectively enhancing the fixing effect of the oil baffle 23 and effectively avoiding the deviation and dislocation of the oil baffle 23 during the blocking process, and greatly improving the stability of the shaft seal device of the compressor. At the same time, the oil baffle 23 extends outward in a direction away from the bearing 4 and plays a blocking role, so that the shaft seal 22 can avoid the splash impact of the bearing lubricating oil, effectively avoiding the damage to the shaft seal 22, thereby reducing the oil leakage risk of the shaft seal 22, effectively prolonging the service life of the shaft seal 22, and realizing the stability of the shaft seal 22. At the same time, the overall structure is simple and the cost is low.

[0041] As shown in Figure 2 and Figure 3 , the shaft seal cover 21 comprises a flange part 211, a sleeve part 212 and a blocking part 213, one end of the blocking part 213 is connected to the end of the sleeve part 212 away from the bearing 4, the other end of the blocking part 213 extends inward along the radial direction of the rotating shaft 1, so that the blocking part 213 and the sleeve part 212 form a sealing cavity 214, the shaft seal 22 is arranged in the sealing cavity 214, one end of the flange part 211 is connected to the outer circumferential surface of the sleeve part 212, and the other end of the flange part 211 extends outward along the radial direction of the rotating shaft 1 and is connected with the casing 3. The shaft seal cover 21 is installed and connected with the casing 3 through the flange part 211, so that the installation and disassembly are very convenient, and the connection stability is high. The bushing 24 is arranged in the sleeve part 212, and the bushing 24 forms the sealing cavity 214 with the blocking part 213 and the sleeve part 212, thereby realizing the fixing effect of the shaft seal 22 and ensuring that the shaft seal 22 is more stable and reliable in use.

[0042] The end of the sleeve part 212 away from the blocking part 213 is located between the casing 3 and the bearing 4, and the shaft seal cover 21 is attached to the two sides of the casing 3 through the flange part 211 and the sleeve part 212, thereby effectively enhancing the connection strength between the shaft seal cover 21 and the casing 3 and being more stable. At the same time, the bearing 4 extends into the sleeve part 212 and abuts against the oil baffle 23, thereby ensuring the fixing effect of the oil baffle 23.

[0043] The inner wall surface of the sleeve part 212 has a sealing surface 2121 and a guide surface 2122, the sealing surface 2121 and the guide surface 2122 are close to the blocking part 213 and the oil baffle 23 respectively, and the guide surface 2122 is recessed outward along the radial direction of the rotating shaft 1, so that the shaft seal 22 is pressed into the sealing surface 2121 through the guide surface 2122. The inner diameter of the guide surface 2122 is greater than the inner diameter of the sealing surface 2121, the guide surface 2122 plays a positioning and guiding role, the shaft seal 22 is first inserted into the guide surface 2122 during the process of being pressed into the shaft seal cover 21, and then is pressed into the sealing surface 2121, so that the side surface of the shaft seal 22 abuts against the blocking part 213, the outer peripheral surface of the shaft seal 22 is tightly abutted against the sealing surface 2121, and the inner wall surface of the shaft seal 22 is abutted against the bushing 24, so that the sealing effect of the shaft seal 22 is ensured. At the same time, the shaft seal 22 is effectively prevented from being pressed to be eccentric or askew during the pressing process, so that the oil leakage of the shaft seal 22 caused by the eccentricity of the shaft seal 22 and the rotating shaft 1 is reduced.

[0044] In the embodiment, the inner diameter of the guide surface 2122 is 0.3mm greater than the outer diameter of the shaft seal 22, so that the shaft seal 22 can be smoothly inserted into the guide surface 2122 and pressed into the sealing surface 2121 through the guide surface 2122.

[0045] The inner wall surface of the sleeve part 212 has a smooth fillet 2123, and the smooth fillet 2123 is located between the guide surface 2122 and the sealing surface 2121. The smooth fillet 2123 is added at the connection between the guide surface 2122 and the sealing surface 2121, and plays a guiding and sliding role through the smooth fillet 2123, so that the shaft seal 22 is smoothly pressed into the shaft seal cover 21, the outer peripheral surface of the shaft seal 22 is prevented from being scratched, and the oil leakage of the outer peripheral surface of the shaft seal 22 and the contact surface of the shaft seal cover 21 is effectively avoided.

[0046] In the embodiment, the number of the shaft seals 22 is two, and the two shaft seals 22 are arranged in a stacked manner along the axial direction of the rotating shaft 1, so that the sealing effect is further strengthened through the two shaft seals 22. Of course, in other embodiments, the number of the shaft seals 22 can not be limited.

[0047] The above only discloses the preferred embodiment of the utility model, and of course cannot limit the right range of the utility model, therefore the equivalent changes made according to the utility model claim still belong to the range covered by the utility model.

Claims

1. A compressor overhang shaft seal apparatus, comprising: The compressor shaft seal structure comprises a rotating shaft, a casing, a bearing and a shaft seal structure, the shaft seal structure and the bearing are sleeved on the rotating shaft, and the bearing is located between the casing and the rotating shaft, the shaft seal structure comprises a shaft seal cover, an oil baffle and a shaft seal, the shaft seal cover is connected to the casing, the shaft seal and the oil baffle are located in the shaft seal cover, and the oil baffle is located between the shaft seal and the bearing.

2. The compressor extended shaft seal apparatus of claim 1, wherein, The shaft seal structure further comprises a bushing, the bushing is located in the shaft seal cover and sleeved on the outer circumferential surface of the rotating shaft, a sealing cavity is formed between the bushing and the shaft seal cover, and the shaft seal is arranged in the sealing cavity.

3. The compressor extended shaft seal apparatus of claim 2, wherein, One end of the oil baffle is pressed between the bushing and the bearing, and the other end of the oil baffle extends outward in a direction away from the bearing.

4. The compressor extended shaft seal apparatus of claim 1, wherein, The shaft seal cover comprises a blocking part, a sleeve part and a flange part, one end of the blocking part is connected to the end of the sleeve part away from the bearing, the other end of the blocking part extends inward in the radial direction of the rotating shaft, so that a sealing cavity is formed between the blocking part and the sleeve part, the shaft seal is arranged in the sealing cavity, one end of the flange part is connected to the outer circumferential surface of the sleeve part, and the other end of the flange part extends outward in the radial direction of the rotating shaft and is connected to the casing.

5. The compressor extended shaft seal apparatus of claim 4, wherein, The inner wall surface of the sleeve part has a sealing surface and a guide surface, the sealing surface and the guide surface are close to the blocking part and the oil baffle respectively, and the guide surface is recessed outward in the radial direction of the rotating shaft, so that the shaft seal is pressed into the sealing surface through the guide surface.

6. The compressor extended shaft seal apparatus of claim 5, wherein, The inner diameter of the guide surface is 0.3mm larger than the outer diameter of the shaft seal.

7. The compressor extended shaft seal apparatus of claim 5, wherein, The inner wall surface of the sleeve part has a smooth fillet, and the smooth fillet is located between the guide surface and the sealing surface.

8. The compressor extended shaft seal apparatus of claim 4, wherein, The end of the sleeve part away from the blocking part is located between the casing and the bearing.

9. The compressor extended shaft seal apparatus of claim 1, wherein, The number of the shaft seal is two, and the two shaft seals are arranged in the axial direction of the rotating shaft.

10. An air compressor characterized by, The compressor shaft seal structure comprises a compressor shaft seal structure as claimed in any one of claims 1-9. The compressor shaft seal structure comprises a compressor shaft seal structure as claimed in any one of claims 1-9.

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