Dry-type oil-free floating sealing device and rotary compressor comprising same
By using the spiral structure and oil storage chamber design of the dry oil-free floating seal device, combined with the labyrinth ring structure, the problems of easy wear of the sealing structure and oil leakage at low speed in rotary air compressors are solved, achieving multiple sealing effects and improving the operating reliability of the compressor and air quality.
Patent Information
- Application Number
- CN202520391170.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-06
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2035-03-06
AI Technical Summary
The contact seal structure of existing rotary air compressors is prone to wear and oil leakage, while the non-contact seal weakens at low speeds or when the machine is stopped, leading to oil leakage or jamming of the main unit.
The dry, oil-free floating sealing device consists of a housing, rotor, integrated oil seal and gas seal assembly. It utilizes the reverse pumping action of the spiral structure and the oil storage chamber design, combined with the labyrinth ring structure, to achieve multiple sealing effects and prevent oil and gas leakage.
It effectively cuts off oil and gas leakage at low speeds or when the machine is stopped, improves the sealing effect, avoids oil leakage and jamming, and improves the quality of compressed air.
Smart Images
Figure CN223952801U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a kind of dry type oilless floating seal device and rotary compressor comprising it. BACKGROUND
[0002] The extended shaft of rotary air compressor main machine is usually sealed by PTFE lip seal or mechanical seal, both of which belong to contact seal. PTFE lip seal is sealed by the contact friction between the lip edge with screw thread and shaft sleeve, and mechanical seal is sealed by the friction between the end face of dynamic ring and static ring under the action of fluid pressure and spring force. Due to the contact, the mutual friction parts are easy to wear out by the rotation of main shaft, resulting in oil leakage and short service life. Therefore, these two forms are used in oil air compressor main machine with low speed.
[0003] Oilless air compressor usually adopts non-contact seal structure. The rotor shaft passes through compression chamber, gas seal assembly and integral oil seal in turn, seals gas by the two-stage gap and labyrinth seal of gas seal assembly, and seals oil by the reverse pumping action of integral oil seal, so that the gas path and oil path are separated to achieve sealing effect. The integral oil seal avoids the risk of oil leakage and poor gas quality or jamming of main machine caused by the failure of oil seal assembly due to the misassembly of wave spring in traditional split oil seal assembly, and reduces the cost of various complex parts. However, in the practical process, when the compressor operates at low speed or stops, the non-contact sealing effect is weakened, resulting in oil leakage or jamming of the main machine. UTILITY MODEL CONTENTS
[0004] The utility model aims at overcoming the above-mentioned deficiencies in the prior art, and provides a dry type oilless floating seal device and rotary compressor comprising the same.
[0005] The utility model is realized by the following technical solutions:
[0006] A dry type oilless floating seal device comprises a shell, a rotor, an integral oil seal and a gas seal assembly. The rotor, the integral oil seal and the gas seal assembly are arranged in the shell, and the integral oil seal and the gas seal assembly are sleeved on the rotor. The inner wall surface of the shell has a protruding portion extending inward. The gas seal assembly is arranged between the integral oil seal and the protruding portion. The inner wall surface of the integral oil seal is provided with a spiral structure. The rotation direction of the spiral structure is opposite to the rotation direction of the rotor. The inner wall surface of the integral oil seal facing the rotor is provided with an outwardly recessed oil storage cavity. The integral oil seal has an oil hole. The oil storage cavity is located between the oil hole and the spiral structure.
[0007] Further, the inner wall surface of the integrated oil seal towards the rotor is provided with an outwardly recessed gas storage cavity between the oil hole and the gas seal assembly.
[0008] Further, the outer surface of the integrated oil seal is tightly fitted with the inner wall surface of the shell.
[0009] Further, the gap between the rear end step of the spiral structure and the rotor is smaller than the gap between the inner side of the spiral structure and the rotor.
[0010] Further, the gas seal assembly comprises a gas seal disc and two gas seal ring assemblies, the two gas seal ring assemblies are respectively located on the two sides of the gas seal disc, and the two gas seal ring assemblies are respectively pressed between the gas seal disc and the convex part and between the integrated oil seal and the gas seal disc.
[0011] Further, the gas seal ring assembly comprises a gas seal ring and a wave spring, the gas seal ring is sleeved on the rotor, and the wave spring is sleeved on the gas seal ring.
[0012] Further, there is a gap between the gas seal disc and the rotor, cavities are formed between the two sides of the gas seal disc and the gas seal ring assembly and the shell respectively, so that two-stage labyrinth ring structures are formed between the gap and the two cavities.
[0013] A rotary compressor comprising the dry oil-free floating sealing device.
[0014] The dry oil-free floating sealing device has the advantages that:
[0015] The dry oil-free floating sealing device and the rotary compressor comprising the same have the advantages that: when the rotary compressor is running, the rotation direction of the spiral structure is opposite to the rotation direction of the rotor, so that the oil is pumped in the opposite direction through the spiral structure, thereby improving the sealing effect of the dry oil-free floating sealing device; when the rotary compressor is running at a low speed, the reverse pumping effect is weakened, the oil that may leak out is cut off and stored in the oil storage cavity, and the oil stored in the oil storage cavity is delivered when the speed is increased, so that the leakage of oil at a low speed or when the compressor is stopped is avoided, and the sealing effect of the dry oil-free floating sealing device is further improved; meanwhile, the leakage of oil and the phenomenon of the compressor being stuck due to the quality of the material, the increase of the cumulative assembly error and assembly negligence are avoided, and the quality of the compressed air of the rotary compressor is improved. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 FIG. 1 is a schematic view of the internal structure of the dry oil-free floating sealing device.
[0017] Figure 2 This is a schematic diagram of the internal structure of the integrated oil seal according to an embodiment of the present invention.
[0018] Explanation of reference numerals in the attached figures:
[0019] Casing 1
[0020] Protrusion 11
[0021] Rotor 2
[0022] Integrated oil seal 3
[0023] Spiral structure 31
[0024] Oil hole 32
[0025] Oil storage chamber 33
[0026] Gas storage chamber 34
[0027] Gas seal assembly 4
[0028] Gas seal plate 41
[0029] 42 gas seal ring assembly
[0030] 421 gas seal ring
[0031] Wave spring 422
[0032] Compression Chamber 5 Detailed Implementation
[0033] 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.
[0034] This embodiment discloses a rotary compressor that includes a dry, oil-free floating seal device. For example... Figure 1 and Figure 2 As shown, the dry oilless floating seal device includes a housing 1, a rotor 2, an integrated oil seal 3, and an air seal assembly 4. The rotor 2, the integrated oil seal 3, and the air seal assembly 4 are all disposed inside the housing 1, and the integrated oil seal 3 and the air seal assembly 4 are both sleeved on the rotor 2. The inner wall surface of the housing 1 has an inwardly extending protrusion 11. The air seal assembly 4 is pressed between the integrated oil seal 3 and the protrusion 11. The inner wall surface of the integrated oil seal 3 has a spiral structure 31. The direction of rotation of the spiral structure 31 is opposite to the direction of rotation of the rotor 2. The inner wall surface of the integrated oil seal 3 facing the rotor 2 has an outwardly recessed oil storage cavity 33. The integrated oil seal 3 has an oil hole 32. The oil storage cavity 33 is located between the oil hole 32 and the spiral structure 31.
[0035] The inner wall surface of the integrated oil seal 3 is provided with a spiral structure 31, and the rotation direction of the spiral structure 31 is opposite to the rotation direction of the rotor 2. During the operation of the rotary compressor, the oil is pumped to the side away from the compression chamber 5 through the reverse pumping effect of the spiral structure 31 due to the opposite rotation direction of the spiral structure 31 and the rotor 2, so as to improve the sealing effect of the dry oil-free floating sealing device. The inner wall surface of the integrated oil seal 3 facing the rotor 2 is provided with an outwardly recessed oil storage cavity 33, and the oil storage cavity 33 is located between the oil hole 32 and the spiral structure 31. When the rotary compressor operates at a low speed, the reverse pumping effect is weakened, and the oil that may leak out is cut off and stored in the oil storage cavity 33. When the speed is subsequently increased, the oil stored in the oil storage cavity 33 is pumped to the side away from the compression chamber 5 due to the improvement of the reverse pumping effect, so as to effectively avoid oil leakage at low speed or during shutdown, and further improve the sealing effect of the dry oil-free floating sealing device.
[0036] During assembly of the dry oil-free floating sealing device, the gas seal assembly 4 is first turned into the deepest part of the housing 1 and abuts against the protruding portion 11, and then the integrated oil seal 3 is knocked into the housing 1, so that the gas seal assembly 4 is pressed between the integrated oil seal 3 and the protruding portion 11, and the outer surface of the integrated oil seal 3 is tightly fitted with the inner wall surface of the housing 1, thereby realizing the assembly of the dry oil-free floating sealing device. The dry oil-free floating sealing device of the present embodiment only needs to be assembled by tightly fitting the integrated oil seal 3 into the housing 1 and abutting against the gas seal assembly 4 to achieve the sealing effect, thereby avoiding oil leakage and the phenomenon of the main machine being stuck due to material quality, cumulative assembly error increase, assembly negligence and the like, and improving the compressed air quality of the rotary compressor.
[0037] The inner wall surface of the integrated oil seal 3 facing the rotor 2 is provided with an outwardly recessed gas storage cavity 34, and the gas storage cavity 34 is located between the oil hole 32 and the gas seal assembly 4. The gas in the compression chamber 5 may leak out, and the gas storage cavity 34 further cuts off and seals the gas that may leak out of the compression chamber 5 under low speed working condition, so that the leaked gas is cut off and sealed in the gas storage cavity 34, thereby further improving the sealing effect of the dry oil-free floating sealing device. At the same time, the integrated oil seal 3 separates the gas path and the oil path through the gas storage cavity 34 and the oil storage cavity 33, respectively, thereby achieving multiple sealing effects.
[0038] In the present embodiment, the outer surface of the integrated oil seal 3 is tightly fitted with the inner wall surface of the housing 1. The integrated oil seal 3 is knocked into the housing 1 and tightly fitted, thereby ensuring the sealing effect of the integrated oil seal 3. At the same time, the integrated oil seal 3 is effectively prevented from being pressed off-center or off-side during the knocking-in process, thereby reducing oil leakage of the integrated oil seal 3 caused by eccentricity of the integrated oil seal 3 and the rotor 2.
[0039] The gap between the rear end step of the spiral structure 31 and the rotor 2 is smaller than the gap between the inner side of the spiral structure 31 and the rotor 2, that is, the gap between the rear end step of the comb-tooth spiral structure of the integrated oil seal 3 and the rotor 2 is smaller than the gap between the inner side of the comb-tooth spiral structure and the rotor 2, so that the oil is further lifted by the reverse pumping action of the spiral structure 31, further improving the sealing effect of the dry oil-free floating seal device. At the same time, it ensures that the leaked oil is stored in the oil storage cavity 33.
[0040] In the embodiment, the gas seal assembly 4 includes a gas seal disc 41 and two gas seal ring assemblies 42, the two gas seal ring assemblies 42 are respectively located on both sides of the gas seal disc 41, and the two gas seal ring assemblies 42 are respectively pressed between the gas seal disc 41 and the convex part 11 and between the integrated oil seal 3 and the gas seal disc 41. By arranging the two gas seal ring assemblies 42 on both sides of the gas seal disc 41, the throttling resistance, expansion deceleration and other effects of the leaked gas in the compression chamber 5 are effectively provided.
[0041] The gas seal ring assembly 42 includes a gas seal ring 421 and a wave spring 422, the gas seal ring 421 is sleeved on the rotor 2, and the wave spring 422 is sleeved on the gas seal ring 421. The wave spring 422 applies a pressing force on the gas seal ring 421, so that the gas seal ring 421 and the gas seal disc 41 or the integrated oil seal 3 are pressed against each other to ensure the sealing effect. Specifically, the gas seal ring 421 has a pressing part extending outward on the outer circumferential surface, and the wave spring 422 is sleeved on the gas seal ring 421 and pressed against the pressing part.
[0042] The gas seal disc 41 and the rotor 2 have a gap therebetween, and the gas seal disc 41 has two cavities formed on both sides thereof between the gas seal ring assembly 42 and the housing 1, so that the gap and the two cavities form a two-stage labyrinth ring structure. Specifically, the gas seal disc 41 and the two gas seal ring assemblies 42 are arranged in the gap between the shaft journal of the rotor 2 and the housing 1, one of the gas seal ring assemblies 42 forms a cavity between the gas seal disc 41 and the housing 1, and the other gas seal ring assembly 42 forms another cavity between the gas seal disc 41 and the integrated oil seal 3, the gap and the two cavities on both sides form a two-stage labyrinth ring structure for sealing gas, and the two-stage labyrinth ring structure is used to seal the gas in the compression chamber 5 by throttling resistance, expansion deceleration and other effects of the leaked gas in the compression chamber 5; the gas storage cavity 34 is used to further seal the gas leaked from the compression chamber 5 under low speed working condition.
[0043] In the embodiment, one of the gas seal ring assemblies 42 close to the compression chamber 5 is installed into the deepest hole of the shell 1, and then the gas seal disc 41 is installed into the second hole of the shell 1, and the gas seal ring 421 is tightly abutted against the gas seal disc 41 by the action of the wave spring 422; then the other gas seal ring assembly 42 is installed into the blind hole of the gas seal disc 41, and is placed to be substantially coaxial with the hole of the shell 1; the integrated oil seal 3 is knocked into the third hole of the shell 1, and the outer surface of the integrated oil seal 3 is tightly fitted with the inner wall surface of the shell 1, so that the right side surface of the integrated oil seal 3 is tightly abutted against the upper surface of the gas seal disc 41, at this time, the gas seal ring 421 is tightly pressed by the action of the wave spring 422, and the sealing structure is preliminarily assembled.
[0044] The above only discloses preferred embodiments of the present application, and of course cannot limit the scope of the present application, therefore equivalent changes made according to the claims of the present application still belong to the scope covered by the present application.
Claims
1. A dry, oil-free, floating seal device, characterized in that, The application relates to a dry oil-free floating seal device, which comprises a shell, a rotor, an integrated oil seal and a gas seal assembly, wherein the rotor, the integrated oil seal and the gas seal assembly are arranged in the shell, the integrated oil seal and the gas seal assembly are sleeved on the rotor, the inner wall surface of the shell is provided with a protrusion extending inward, the gas seal assembly is arranged between the integrated oil seal and the protrusion, the inner wall surface of the integrated oil seal is provided with a spiral structure, the spiral structure is opposite to the rotation direction of the rotor, the inner wall surface of the integrated oil seal towards the rotor is provided with an outwardly recessed oil storage cavity, the integrated oil seal is provided with an oil hole, and the oil storage cavity is located between the oil hole and the spiral structure.
2. The dry, oil-free floating seal apparatus of claim 1, wherein, The inner wall surface of the integrated oil seal towards the rotor is provided with an outwardly recessed gas storage cavity, and the gas storage cavity is located between the oil hole and the gas seal assembly.
3. The dry, oil-free floating seal apparatus of claim 1, wherein, The outer surface of the integrated oil seal is tightly matched with the inner wall surface of the shell.
4. The dry, oil-free floating seal apparatus of claim 1, wherein, The gap between the rear end step of the spiral structure and the rotor is smaller than the gap between the inner side of the spiral structure and the rotor.
5. The dry, oil-free floating seal apparatus of claim 1, wherein, The gas seal assembly comprises a gas seal disc and two gas seal ring assemblies, the two gas seal ring assemblies are located on the two sides of the gas seal disc respectively, and the two gas seal ring assemblies are arranged between the gas seal disc and the protrusion and between the integrated oil seal and the gas seal disc respectively.
6. The dry, oil-free floating seal apparatus of claim 5, wherein, The gas seal ring assembly comprises a gas seal ring and a wave spring, the gas seal ring is sleeved on the rotor, and the wave spring is sleeved on the gas seal ring.
7. The dry, oil-free floating seal apparatus of claim 5, wherein, The gas seal disc is provided with a gap with the rotor, the two sides of the gas seal disc are respectively provided with cavities with the gas seal ring assembly and the shell, so that two-stage labyrinth ring structures are formed between the gap and the two cavities.
8. A rotary compressor characterized by comprising: The application further relates to a dry oil-free floating seal device comprising the device according to any one of claims 1-7.