Floating ring nitrogen filling isolation compressor
By adopting a floating ring filling nitrogen isolation structure in the dry compressor, the problem of mechanical seals being easily damaged under high discharge temperature and high speed conditions is solved, and effective sealing of medium gases and lubricating oil is achieved, extending the service life of the equipment and avoiding pollution.
Patent Information
- Application Number
- CN202510313267.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-17
- Publication Date
- 2025-06-03
AI Technical Summary
Under high discharge temperature and high speed conditions, the mechanical seal of the dry compressor is prone to damage, resulting in dielectric gas leakage and lubricant contamination, which in turn damages the high-speed rotating parts.
Using a floating ring filling nitrogen isolation structure, nitrogen is injected through the first and second nitrogen injection pores, and a floating ring seal and oil seal system are used to prevent leakage of medium gas and lubricating oil, replacing the traditional mechanical seal.
The sealing of medium gas is achieved safe and reliable, and the lubricant contamination of medium gas is avoided, and the service life of the equipment is extended. Moreover, due to the use of inert gas nitrogen, there is no risk of pollution.
Smart Images
Figure CN120083686A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of compressors, and more specifically to a compressor with floating ring nitrogen injection isolation. Background Art
[0002] In dry compressors, in order to prevent the leakage of medium gas to the atmosphere side and prevent the lubricating oil for bearing lubrication from flowing into the medium gas and causing medium gas pollution, a set of double-ended mechanical seals, labyrinth seals, carbon ring seals, etc. are usually installed at the shaft seal to block. However, dry compressors have high exhaust temperatures and high speeds, which require high-quality metal materials for mechanical seals and seal ring materials. Moreover, the leakage of medium gas is large and the pressure is high. If the previous seals do not form a limited barrier, the high-pressure medium gas will cause a strong impact on the mechanical seal, which may lead to damage to the mechanical seal. If the mechanical seal fails and the lubricating oil contaminates the medium gas, resulting in the medium gas containing aromatics, then aromatic condensates will be generated at low temperatures. These aromatic condensates will accumulate in the dead corners of the housing and cause damage to high-speed rotating parts. Summary of the Invention
[0003] The technical problem to be solved by the present invention is to provide a compressor with floating ring nitrogen injection isolation, which has a simple structure, does not use mechanical seals, and can ensure the safe and reliable sealing of medium gas, effectively extending the service life of the equipment.
[0004] The technical solution of the present invention is to provide a compressor with floating ring nitrogen injection isolation, including a rotor and a housing. Between the protruding shafts at both ends of the rotor and the housing, there are bearings and a sealing system. The sealing system includes an oil seal opposite to the bearing and a floating ring seal adjacent to the oil seal. In the area of the housing opposite to the sealing system, there are a first nitrogen injection hole, a nitrogen discharge hole, and a second nitrogen injection hole arranged in sequence. The first nitrogen injection hole and the nitrogen discharge hole are both communicated with the floating ring seal, and the second nitrogen injection hole is communicated with the oil seal.
[0005] Compared with the prior art, the compressor with floating ring nitrogen injection isolation of the present invention has the following advantages: The floating ring seal has a simple structure, fewer components, can be replaced without disassembling the compressor housing, and has low installation technical requirements; The first nitrogen injection hole of the housing is communicated with the floating ring seal. Injecting nitrogen into the first nitrogen injection hole can block the leakage of the medium gas from the crossover hole on the housing to the atmosphere side; The second nitrogen injection hole is communicated with the oil seal. Injecting nitrogen into the second nitrogen injection hole can block the lubricating oil for lubricating the bearing from flowing to the medium gas, resulting in medium gas pollution; The nitrogen injected from the first nitrogen injection hole and the second nitrogen injection hole can be emptied to the outside through the nitrogen discharge hole; Nitrogen is cheap and easily available, and is an inert gas, non-toxic and harmless. There is no pollution problem whether it is emptied to the outside or mixed with the medium gas, and the safety is high; In this way, without using a mechanical seal, the sealing system can also ensure the safe and reliable sealing of the medium gas, avoid the lubricating oil polluting the medium gas and causing the formation of aromatic condensates at low temperatures to damage the high-speed rotating parts, and extend the service life of the equipment.
[0006] Preferably, the floating ring seal includes a floating ring seat arranged in the housing and several floating rings arranged in the floating ring seat. There are at least two floating rings spaced between the position where the first nitrogen injection hole is communicated with the floating ring seal and the position where the nitrogen discharge hole is communicated with the floating ring seal, and at least two floating rings are spaced between the position where the second nitrogen injection hole is communicated with the oil seal and the position where the nitrogen discharge hole is communicated with the floating ring seal. With this structure, the two floating rings can block nitrogen to a certain extent, avoiding the nitrogen injected into the first nitrogen injection hole and the second nitrogen injection hole from immediately discharging from the second nitrogen injection hole, ensuring that there is enough nitrogen in the nitrogen injected into the first nitrogen injection hole to travel in the direction opposite to the leakage direction of the medium gas to block the leakage of the medium gas from the crossover hole on the housing, and also ensuring that there is enough nitrogen in the nitrogen injected into the second nitrogen injection hole to travel in the direction opposite to the leakage direction of the lubricating oil to block the lubricating oil from flowing to the medium gas and causing medium gas pollution.
[0007] Preferably, there are no less than six floating rings. The floating ring adjacent to the rotor is the first floating ring. The position where the first nitrogen injection hole is communicated with the floating ring seal is opposite to the first floating ring, and the position where the nitrogen discharge hole is communicated with the floating ring seal is opposite to the fourth floating ring. With this structure, the nitrogen injected into the first nitrogen injection hole will flow into the second floating ring through the small holes of the floating ring seat, and in the gap between the floating ring and the protruding shaft of the rotor, it will flow to the medium side to block the medium gas all the way, and flow to the third and fourth floating rings all the way, and pass through the small holes of the floating ring seat at the fourth floating ring and be discharged from the housing through the nitrogen discharge hole; The nitrogen injected into the second nitrogen injection hole will enter the gap between the oil seal ring and the protruding shaft of the rotor through the small holes in the oil seal adjusting seat, then block the lubricating oil from polluting the medium gas all the way, and flow to the floating ring seal all the way. After passing through the sixth and fifth floating rings, it will pass through the small holes of the floating ring seat at the fourth floating ring and be discharged from the housing through the nitrogen discharge hole.
[0008] Preferably, there are at least two first nitrogen injection holes. At all positions where the first nitrogen injection holes are in sealed communication with the floating ring, they are opposite to the same floating ring and are circumferentially evenly distributed. With this structure, by providing a plurality of first nitrogen injection holes that are circumferentially evenly distributed, after uniformly injecting nitrogen, it can ensure that there is sufficient nitrogen to block the leakage of the medium gas. All the first nitrogen injection holes are opposite to the same floating ring, avoiding the reverse mutual obstruction of the nitrogen injected into the first nitrogen injection holes.
[0009] Preferably, there are at least two second nitrogen injection holes. At all positions where the second nitrogen injection holes are in communication with the oil seal, they are circumferentially evenly distributed on the same radial section of the oil seal. With this structure, by providing a plurality of second nitrogen injection holes that are circumferentially evenly distributed, after uniformly injecting nitrogen, it can ensure that there is sufficient nitrogen to block the lubricating oil from contaminating the medium gas. All the second nitrogen injection holes are distributed on the same radial section of the oil seal, avoiding the reverse mutual obstruction of the nitrogen injected into the second nitrogen injection holes.
[0010] Preferably, there are at least two nitrogen discharge holes. At all positions where the nitrogen discharge holes are in sealed communication with the floating ring, they are opposite to the same floating ring and are circumferentially evenly distributed. With this structure, by providing a plurality of nitrogen discharge holes that are circumferentially evenly distributed, it is beneficial to quickly evacuate the nitrogen injected from the first nitrogen injection holes and the second nitrogen injection holes to the outside. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 is a schematic cross-sectional view of a compressor with floating ring nitrogen injection isolation according to the present invention.
[0012] Figure 2 is Figure 1 an enlarged structural schematic view of the sealing system in area A in
[0013] As shown in the figure: 1. Rotor, 2. Housing, 3. Floating ring, 4. Floating ring seat, 5. Oil seal adjusting seat, 6. Oil seal ring, 7. First nitrogen injection hole, 8. Second nitrogen injection hole, 9. Nitrogen discharge hole, 10. Bearing. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0014] To better understand the present application, more detailed descriptions will be made for various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of the exemplary embodiments of the present application and do not limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements.
[0015] In the drawings, for the sake of clarity, the thickness, dimensions, and shape of the objects have been slightly exaggerated. The drawings are only examples and are not drawn to an exact scale.
[0016] It should also be understood that the terms "comprises", "comprising", "includes", and "including", when used in this specification, denote the presence of the stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or combinations thereof. Further, when an expression such as "at least one of..." appears after a list of listed features, it modifies the entire list of listed features rather than modifying a single element in the list.
[0017] As Figure 1 shown, the compressor with floating ring nitrogen injection isolation of the present invention includes a housing 2, a rotor 1 is arranged in the housing 2, the rotor 1 includes a pair of male and female screw rotors, and bearings 10 and a sealing system are arranged between the protruding shafts at both ends of each rotor and the housing.
[0018] The said sealing system is as Figure 2 shown in, and includes an oil seal opposite to the bearing 10 and a floating ring seal adjacent to the oil seal. The oil seal includes an oil seal adjusting seat 5 arranged in the housing 2, an oil seal ring 6 is arranged on the oil seal adjusting seat 5, the oil seal ring 6 is in clearance fit with the protruding shaft of the rotor, and small holes leading to the oil seal ring 6 are arranged on the oil seal adjusting seat 5. The floating ring seal includes a floating ring seat 4 arranged in the housing, six floating rings 3 in the floating ring seat 4, and small holes leading to each floating ring 3 are arranged on the floating ring seat 4. A first nitrogen injection hole 7, a nitrogen discharge hole 9, and a second nitrogen injection hole 8 are sequentially arranged in the area of the housing opposite to the said sealing system. The first nitrogen injection hole 7 and the nitrogen discharge hole 9 are both communicated with the said floating ring seal, and the second nitrogen injection hole 8 is communicated with the oil seal. The position where the first nitrogen injection hole 7 is communicated with the said floating ring seal is at the first floating ring adjacent to the rotor, and the position where the nitrogen discharge hole 9 is communicated with the said floating ring seal is at the fourth floating ring. The position where the second nitrogen injection hole 8 is communicated with the oil seal is at the outlet of the oil seal, that is, the position where the oil seal is adjacent to the sixth floating ring. Thus, there are three floating rings 3 spaced between the position where the first nitrogen injection hole 7 is communicated with the said floating ring seal and the position where the nitrogen discharge hole 9 is communicated with the said floating ring seal, and there are two floating rings 3 spaced between the position where the second nitrogen injection hole 8 is communicated with the oil seal and the position where the nitrogen discharge hole 9 is communicated with the said floating ring seal.
[0019] When the compressor with floating ring nitrogen injection isolation of the present invention is working, nitrogen is injected into the first nitrogen injection hole 7. The nitrogen will flow into the second floating ring through the small holes of the floating ring seat 4, and flow in two directions, left and right, in the gap between the floating ring and the protruding shaft of the rotor. One way can travel in the direction opposite to the leakage direction of the medium gas, blocking the leakage of the medium gas from the through-hole on the housing to the atmosphere side. The other way flows to the third and fourth floating rings, and passes through the small holes of the floating ring seat at the fourth floating ring and is discharged from the housing through the nitrogen discharge hole 9; when nitrogen is also injected into the second nitrogen injection hole 8, the nitrogen will enter the gap between the oil seal ring and the protruding shaft of the rotor through the small holes in the oil seal adjusting seat, and then flow in two directions, left and right. One way travels in the direction opposite to the leakage direction of the lubricating oil, preventing the lubricating oil from contaminating the medium gas. The other way flows to the floating ring seal, and after passing through the sixth and fifth floating rings, it passes through the small holes of the floating ring seat at the fourth floating ring and is discharged from the housing through the nitrogen discharge hole 9.
[0020] The floating ring seal has a simple structure, few components, can be replaced without disassembling the housing of the compressor, and has low installation technical requirements; nitrogen is cheap and easy to obtain, and is an inert gas, non-toxic and harmless. There is no pollution problem whether it is discharged to the outside or mixed with the medium gas, and it has high safety. In the compressor with floating ring nitrogen injection isolation of the present invention, the mechanical seal is not adopted in the sealing system, and it can also ensure the reliable sealing of the medium gas, avoid the lubricating oil contaminating the medium gas and causing the generation of aromatic condensates at low temperatures to damage the high-speed rotating parts, and extend the service life of the equipment.
[0021] In other embodiments, multiple first nitrogen injection holes 7 can be provided. All the positions where the first nitrogen injection holes 7 communicate with the floating ring seal are opposite to the same floating ring and are circumferentially evenly distributed. After uniformly injecting nitrogen into multiple first nitrogen injection holes 7, it can ensure sufficient nitrogen quantity to block the leakage of the medium gas. All the first nitrogen injection holes 7 are opposite to the same floating ring, avoiding the reverse mutual obstruction of the nitrogen injected into the first nitrogen injection holes 7.
[0022] In other embodiments, multiple second nitrogen injection holes 8 can be provided. All the positions where the second nitrogen injection holes 8 communicate with the oil seal are circumferentially evenly distributed on the same radial section of the oil seal. After uniformly injecting nitrogen into multiple second nitrogen injection holes 8, it can ensure sufficient nitrogen quantity to block the lubricating oil from contaminating the medium gas. All the second nitrogen injection holes 8 are distributed on the same radial section of the oil seal, avoiding the reverse mutual obstruction of the nitrogen injected into the second nitrogen injection holes 8.
[0023] In other embodiments, there are at least two nitrogen discharge holes 9, and at the positions where all the nitrogen discharge holes 9 are in sealing communication with the floating ring, they are all opposite to the same floating ring and are circumferentially evenly distributed. Arranging multiple nitrogen discharge holes 9 is conducive to quickly discharging the nitrogen injected from the first nitrogen injection hole 7 and the second nitrogen injection hole 8 to the outside. All the nitrogen discharge holes 9 are opposite to the same floating ring, which will not affect the amount of nitrogen gas used to block the leakage of the medium gas, nor will it affect the amount of nitrogen gas used to block the lubricating oil from contaminating the medium gas.
[0024] The above are only specific embodiments of the present invention and are not used to limit the scope of implementation of the present invention; if the present invention is modified or equivalently replaced without departing from the spirit and scope of the present invention, it should be covered by the protection scope of the claims of the present invention.
Claims
1. A floating ring nitrogen-filled compressor, comprising a rotor and a casing, characterized in that: Bearings and a sealing system are arranged between the protruding shafts at both ends of the rotor and the housing. The sealing system comprises an oil seal opposite to the bearing and a floating ring seal adjacent to the oil seal. A first nitrogen injection hole (7), a nitrogen discharge hole (9) and a second nitrogen injection hole (8) are arranged in sequence in the area of the housing opposite to the sealing system. The first nitrogen injection hole (7) and the nitrogen discharge hole (9) are both communicated with the floating ring seal, and the second nitrogen injection hole (8) is communicated with the oil seal.
2. The floating ring nitrogen-filled compressor according to claim 1, characterized in that: The floating ring seal comprises a floating ring seat (4) arranged in the housing and a plurality of floating rings (3) arranged in the floating ring seat (4); at least two floating rings (3) are spaced between a position where a first nitrogen injection hole (7) is connected to the floating ring seal and a position where a nitrogen gas discharge hole (9) is connected to the floating ring seal; and at least two floating rings (3) are spaced between a position where a second nitrogen injection hole (8) is connected to the oil seal and a position where a nitrogen gas discharge hole (9) is connected to the floating ring seal.
3. The floating ring nitrogen-filled compressor according to claim 2, characterized in that: There are no less than six floating rings (3), the floating ring adjacent to the rotor is the first floating ring, the position where the first nitrogen injection hole (7) is connected to the floating ring seal is opposite to the first floating ring, and the position where the nitrogen discharge hole (9) is connected to the floating ring seal is opposite to the fourth floating ring.
4. The floating ring nitrogen-filled isolated compressor according to claim 2, characterized in that: There are at least two first nitrogen injection holes (7), and the positions of all the first nitrogen injection holes (7) communicating with the floating ring seal are opposite to the same floating ring and are evenly distributed in the circumferential direction.
5. The floating ring nitrogen-filled isolated compressor according to claim 2, characterized in that: There are at least two second nitrogen injection holes (8), and the positions where all the second nitrogen injection holes (8) are connected to the oil seal are evenly distributed in the circumferential direction on the same radial cross section of the oil seal.
6. The floating ring nitrogen-filled compressor of claim 2, characterized in that: There are at least two nitrogen discharge holes (9), and the positions of all nitrogen discharge holes (9) communicating with the floating ring seal are opposite to the same floating ring and are evenly distributed in the circumferential direction.