Floating ring nitrogen filling isolation compressor
By using a floating ring nitrogen-filled isolation structure, nitrogen is used to prevent leakage of media gas and lubricating oil, thus solving the problem of easy damage to mechanical seals in dry compressors and achieving safe and reliable sealing of media gas and long service life of the equipment.
Patent Information
- Application Number
- CN202520463202.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-17
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2035-03-17
AI Technical Summary
In dry compressors, the leakage of medium gas is large and the pressure is high, which can easily damage the mechanical seal, leading to medium gas contamination and lubricating oil contamination, and the accumulation of aromatic hydrocarbon condensates that can damage the equipment.
A floating ring nitrogen injection isolation structure is adopted. Nitrogen gas is injected through the first nitrogen injection hole and the second nitrogen injection hole to prevent leakage of medium gas and lubricating oil. Excess nitrogen gas is discharged through the nitrogen vent hole, avoiding the use of mechanical seals.
It achieves safe and reliable sealing of the medium gas, avoids lubricating oil contamination, and extends the service life of the equipment.
Smart Images
Figure CN223894400U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of compressors, and more specifically to a compressor with a floating ring nitrogen-isolated design. Background Technology
[0002] In dry compressors, to prevent the medium gas from leaking to the atmosphere and to prevent the lubricating oil used to lubricate the bearings from flowing into the medium gas and causing contamination, a set of double-end mechanical seals, such as comb seals and carbon ring seals, is usually installed at the shaft seal. However, dry compressors have high discharge temperatures and high speeds, which places high demands on the metal materials of the mechanical seals and the materials of the sealing rings. Furthermore, the leakage of the medium gas is large and the pressure is high. If the preceding seals do not provide a sufficient barrier, the high-pressure medium gas will cause a strong impact on the mechanical seal, potentially leading to its damage. If the mechanical seal fails, the lubricating oil will contaminate the medium gas, resulting in the presence of aromatics. At low temperatures, these aromatic condensates will form and accumulate in the dead corners of the casing, damaging high-speed rotating parts. Utility Model Content
[0003] The technical problem to be solved by this utility model is to provide a compressor with nitrogen isolation by floating ring filling, which has a simple structure, does not use mechanical seal, and can still ensure safe and reliable sealing of the medium gas, effectively extending the service life of the equipment.
[0004] The technical solution of this utility model is to provide a compressor with floating ring nitrogen injection isolation, including a rotor and a housing. Bearings and a sealing system are provided between the extended shafts at both ends of the rotor and the housing. The sealing system includes an oil seal opposite to the bearing and a floating ring seal adjacent to the oil seal. The area of the housing opposite to the sealing system is provided with a first nitrogen injection hole, a nitrogen discharge hole and a second nitrogen injection hole in sequence. The first nitrogen injection hole and the nitrogen discharge hole are both connected to the floating ring seal, and the second nitrogen injection hole is connected to the oil seal.
[0005] Compared with existing technologies, the compressor with floating ring nitrogen isolation of this utility model has the following advantages: the floating ring sealing structure is simple, with few parts, and can be replaced without disassembling the compressor housing, requiring low installation technology; the first nitrogen injection hole of the housing is connected to the floating ring seal, and injecting nitrogen into the first nitrogen injection hole can prevent the medium gas from leaking to the atmosphere from the bridge hole on the housing; the second nitrogen injection hole is connected to the oil seal, and injecting nitrogen into the second nitrogen injection hole can prevent the lubricating oil used to lubricate the bearing from flowing into the medium gas and causing medium gas contamination; the nitrogen injected from the first and second nitrogen injection holes can be discharged to the outside through the nitrogen discharge hole; nitrogen is inexpensive and readily available, and is an inert gas, non-toxic and harmless, and there is no pollution problem when venting it to the outside or mixing it with the medium gas, resulting in high safety; thus, the sealing system does not use a mechanical seal, but can still ensure the sealing safety and reliability of the medium gas, avoiding lubricating oil contamination of the medium gas, which can lead to the formation of aromatic hydrocarbon condensates at low temperatures that can damage high-speed rotating parts, and extending the service life of the equipment.
[0006] Preferably, the floating ring seal includes a floating ring seat disposed within the housing and a plurality of floating rings disposed within the floating ring seat. At least two floating rings are spaced between the position where the first nitrogen injection hole communicates with the floating ring seal and the position where the nitrogen discharge hole communicates with the floating ring seal. Similarly, at least two floating rings are spaced between the position where the second nitrogen injection hole communicates with the oil seal and the position where the nitrogen discharge hole communicates with the floating ring seal. With this structure, the two floating rings can, to a certain extent, impede nitrogen gas, preventing the nitrogen injected into the first and second nitrogen injection holes from immediately escaping through the second nitrogen injection hole. This ensures that sufficient nitrogen gas is injected into the first nitrogen injection hole to travel against the direction of media gas leakage, thus preventing media gas leakage from the bridge hole on the housing. It also ensures that sufficient nitrogen gas is injected into the second nitrogen injection hole to travel against the direction of lubricating oil leakage, thus preventing lubricating oil from flowing into the media gas and causing media gas contamination.
[0007] Preferably, there are no fewer than six float rings. The float ring adjacent to the rotor is the first float ring. The position where the first nitrogen injection hole is sealed and connected to the float ring is opposite to the first float ring. The position where the nitrogen discharge hole is sealed and connected to the float ring is opposite to the fourth float ring. With this structure, the nitrogen injected into the first nitrogen injection hole will flow into the second float ring through the small hole of the float ring seat. In the gap between the float ring and the rotor extension shaft, one path flows to the medium side to block the medium gas, and the other path flows to the third and fourth float rings. At the fourth float ring, it passes through the small hole of the float ring seat and exits the housing through the nitrogen discharge hole. Meanwhile, the nitrogen injected into the second nitrogen injection hole will enter the gap between the oil seal ring and the rotor extension shaft through the small hole in the oil seal adjusting seat. Then, one path prevents the lubricating oil from contaminating the medium gas, and the other path flows to the float ring seal. After passing through the sixth and fifth float rings, it exits the housing from the fourth float ring through the small hole of the float ring seat and exits through the nitrogen discharge hole.
[0008] Preferably, there are at least two first nitrogen injection holes, and all the first nitrogen injection holes are positioned opposite to the same floating ring and are evenly distributed circumferentially. This structure, with multiple evenly distributed first nitrogen injection holes, ensures sufficient nitrogen to prevent leakage of the medium gas after uniform nitrogen injection. Furthermore, the fact that all the first nitrogen injection holes are opposite to the same floating ring avoids reverse flow and mutual obstruction of nitrogen injected into the first nitrogen injection holes.
[0009] Preferably, there are at least two second nitrogen injection holes, and all the second nitrogen injection holes are circumferentially and evenly distributed on the same radial cross-section of the oil seal at their communication points with the oil seal. This structure, with multiple circumferentially evenly distributed second nitrogen injection holes, ensures sufficient nitrogen to prevent lubricating oil from contaminating the medium gas after uniform nitrogen injection. Furthermore, the fact that all the second nitrogen injection holes are distributed on the same radial cross-section of the oil seal avoids mutual obstruction of nitrogen injected into the second nitrogen injection holes.
[0010] Preferably, there are at least two nitrogen vent holes, and all the nitrogen vent holes are connected to the floating ring in a sealed manner, and are circumferentially distributed opposite to the same floating ring. This structure, with multiple circumferentially distributed nitrogen vent holes, facilitates the rapid venting of nitrogen injected from the first and second nitrogen injection holes. Attached Figure Description
[0011] Figure 1 This is a cross-sectional schematic diagram of the compressor for nitrogen isolation via the floating ring of this utility model.
[0012] Figure 2 for Figure 1 Enlarged structural diagram of the sealing system in area A.
[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 exhaust hole, 10. Bearing. Detailed Implementation
[0014] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements.
[0015] In the accompanying drawings, the thickness, size, and shape of the objects have been slightly exaggerated for illustrative purposes. The drawings are for illustrative purposes only and are not drawn to scale.
[0016] It should also be understood that the terms "comprising," "having," "including," and "containing," when used in this specification, indicate the presence of the stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or combinations thereof. Furthermore, when expressions such as "...at least one" appear after a list of listed features, they modify the entire listed feature, not individual elements in the list.
[0017] like Figure 1 As shown, the compressor with floating ring nitrogen isolation of this utility model includes a housing 2, and a rotor 1 is provided inside the housing 2. The rotor 1 includes a pair of male and female screw rotors. A bearing 10 and a sealing system are provided between the protruding shafts at both ends of each rotor and the housing.
[0018] The sealing system described above is as follows Figure 2 As shown, the system 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 disposed within the housing 2, with an oil seal ring 6 disposed on the oil seal adjusting seat 5. The oil seal ring 6 has a clearance fit with the rotor extension shaft, and the oil seal adjusting seat 5 has a small hole leading to the oil seal ring 6. The floating ring seal includes a floating ring seat 4 disposed within the housing, with six floating rings 3 within the floating ring seat 4, and small holes leading to each floating ring 3 disposed on the floating ring seat 4. In the area of the housing opposite to the sealing system, a first nitrogen injection hole 7, a nitrogen discharge hole 9, and a second nitrogen injection hole 8 are sequentially disposed. Both the first nitrogen injection hole 7 and the nitrogen discharge hole 9 are connected to the floating ring seal, and the second nitrogen injection hole 8 is connected to the oil seal. The first nitrogen injection hole 7 is connected to the floating ring seal at the first floating ring adjacent to the rotor, and the nitrogen discharge hole 9 is connected to the floating ring seal at the fourth floating ring. The second nitrogen injection port 8 is connected to the oil seal at the oil seal outlet, i.e., the position where the oil seal is adjacent to the sixth floating ring. Thus, there are three floating rings 3 between the position where the first nitrogen injection port 7 is sealed to the floating ring, and between the position where the nitrogen exhaust port 9 is sealed to the floating ring; and there are two floating rings 3 between the position where the second nitrogen injection port 8 is sealed to the oil seal, and between the position where the nitrogen exhaust port 9 is sealed to the floating ring.
[0019] When the compressor with nitrogen-isolated floating ring is in operation, nitrogen is injected into the first nitrogen injection hole 7. The nitrogen flows into the second floating ring through the small hole of the floating ring seat 4, and flows to the left and right in the gap between the floating ring and the rotor extension shaft. One path travels against the direction of medium gas leakage, preventing the medium gas from leaking to the atmosphere through the bridge hole on the housing. The other path flows to the third and fourth floating rings, and at the fourth floating ring, it passes through the small hole of the floating ring seat and exits the housing through the nitrogen discharge hole 9. Nitrogen is also injected into the second nitrogen injection hole 8. The nitrogen enters the gap between the oil seal ring and the rotor extension shaft through the small hole in the oil seal adjusting seat, and then flows to the left and right. One path travels against the direction of lubricating oil leakage, preventing lubricating oil from contaminating the medium gas. The other path flows to the floating ring seal. After passing through the sixth and fifth floating rings, it exits the housing from the fourth floating ring through the small hole of the floating ring seat and exits the housing through the nitrogen discharge hole 9.
[0020] The floating ring seal structure is simple, with few parts, and can be replaced without disassembling the compressor housing, requiring minimal installation skills. Nitrogen is inexpensive and readily available, and as an inert gas, it is non-toxic and harmless, posing no pollution problem whether discharged externally or mixed with the medium gas, ensuring high safety. In this utility model's nitrogen-isolated floating ring compressor, the sealing system does not employ a mechanical seal, yet still ensures a safe and reliable seal for the medium gas. This prevents lubricating oil from contaminating the medium gas, which could lead to the formation of aromatic hydrocarbon condensates at low temperatures that could damage high-speed rotating parts, thus extending the equipment's service life.
[0021] In other embodiments, multiple first nitrogen injection holes 7 can be provided. All first nitrogen injection holes 7 are positioned opposite to the same floating ring and are evenly distributed circumferentially. When multiple first nitrogen injection holes 7 are simultaneously injected with nitrogen, sufficient nitrogen is ensured to prevent leakage of the medium gas. Since all first nitrogen injection holes 7 are opposite to the same floating ring, it avoids mutual obstruction of nitrogen injected into the first nitrogen injection holes 7 in opposite directions.
[0022] In other embodiments, multiple second nitrogen injection holes 8 can be provided, and all the positions of the second nitrogen injection holes 8 communicating with the oil seal are evenly distributed circumferentially on the same radial cross section of the oil seal. After nitrogen is injected into multiple second nitrogen injection holes 8 at the same time, it can be ensured that there is a sufficient amount of nitrogen to prevent the lubricating oil from contaminating the medium gas. The fact that all the second nitrogen injection holes 8 are distributed on the same radial cross section of the oil seal avoids the nitrogen injected into the second nitrogen injection holes 8 being mutually reversible.
[0023] In other embodiments, there are at least two nitrogen vent holes 9. All nitrogen vent holes 9 are connected to the floating ring at positions opposite to the same floating ring and are evenly distributed circumferentially. Providing multiple nitrogen vent holes 9 facilitates the rapid venting of nitrogen injected from the first nitrogen injection hole 7 and the second nitrogen injection hole 8. Since all nitrogen vent holes 9 are opposite to the same floating ring, the amount of nitrogen used to prevent leakage of the medium gas is not affected, nor is the amount of nitrogen used to prevent lubricating oil from contaminating the medium gas.
[0024] The above are merely specific embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Any modifications or equivalent substitutions to this utility model without departing from its spirit and scope should be covered within the protection scope of the claims of this utility model.
Claims
1. A compressor with floating ring nitrogen isolation, comprising a rotor and a housing, characterized in that, Bearings and sealing systems are provided between the extended shafts at both ends of the rotor and the housing. The sealing system includes an oil seal opposite to the bearing and a floating ring seal adjacent to the oil seal. The area of the housing opposite to the sealing system is provided with a first nitrogen injection hole (7), a nitrogen discharge hole (9), and a second nitrogen injection hole (8). The first nitrogen injection hole (7) and the nitrogen discharge hole (9) are both connected to the floating ring seal, and the second nitrogen injection hole (8) is connected to the oil seal.
2. The compressor with nitrogen isolation via floating ring as described in claim 1, characterized in that, The floating ring seal includes a floating ring seat (4) disposed in the housing and a plurality of floating rings (3) disposed in the floating ring seat (4). At least two floating rings (3) are spaced between the position where the first nitrogen injection hole (7) communicates with the floating ring seal and the position where the nitrogen discharge hole (9) communicates with the floating ring seal. At least two floating rings (3) are spaced between the position where the second nitrogen injection hole (8) communicates with the oil seal and the position where the nitrogen discharge hole (9) communicates with the floating ring seal.
3. The compressor with nitrogen isolation via floating ring as described in claim 2, characterized in that, There are no fewer than six float rings (3). The float ring adjacent to the rotor is the first float ring. The position of the first nitrogen injection hole (7) which is sealed and connected with the float ring is opposite to the first float ring. The position of the nitrogen discharge hole (9) which is sealed and connected with the float ring is opposite to the fourth float ring.
4. The compressor with nitrogen isolation via floating ring filling according to claim 2, characterized in that, There are at least two first nitrogen injection holes (7), and all the positions of the first nitrogen injection holes (7) that are sealed and connected with the floating ring are opposite to the same floating ring and are evenly distributed in the circumference.
5. The compressor with nitrogen isolation via floating ring as described in claim 2, characterized in that, There are at least two second nitrogen injection holes (8), and all the second nitrogen injection holes (8) are circumferentially and evenly distributed on the same radial section of the oil seal at the positions where they communicate with the oil seal.
6. The compressor with nitrogen isolation via floating ring as described in claim 2, characterized in that, There are at least two nitrogen vent holes (9), and all the nitrogen vent holes (9) are connected to the floating ring in a sealed manner, and are circumferentially distributed opposite to the same floating ring.