An inflatable oil seal structure and compressor

Abstract

The application provides an inflatable oil seal structure and a compressor, and belongs to the technical field of bearing area sealing. The inflatable oil seal structure comprises a sealing ring and an inflation channel on a bearing cover, so that isolation gas is introduced between the sealing ring and a rotor assembly through the inflation channel, the isolation gas forms a physical barrier between the rotor assembly and the sealing ring and forms a pressure difference, the pressure outside the bearing area is higher than the pressure inside the bearing area, a pressure gradient is formed from the isolation gas side to the bearing area, lubricating oil cannot break through the barrier formed by the isolation gas due to the lower pressure, and then the lubricating oil is prevented from leaking from between the sealing ring and the rotor assembly, the lubricating oil is limited inside the bearing area, the possibility of lubricating oil leakage from the bearing area is reduced without reducing the gap between the sealing structure and the rotor assembly, the waste of lubricating oil is avoided, the operation and maintenance cost is saved, and the site of the unit is kept clean and tidy.

Description

Technical Field

[0001] This application belongs to the field of bearing sealing technology, specifically relating to an air-filled oil seal structure and a compressor. Background Technology

[0002] The bearing area of ​​an MCO compressor is an independent bearing area, typically sealed on both sides using a comb-tooth seal structure. Long-term field monitoring and follow-up visits have revealed oil leakage in the bearing area oil seals of some units. This not only leads to a harsh working environment but also significantly increases the maintenance costs of the lubrication station due to long-term lubrication oil leakage. Currently, oil leakage in the bearing area is generally addressed by reducing the gap between the oil seal and the main shaft to minimize external leakage. However, when the amount of oil fumes in the bearing area is high and the pressure increases, lubricating oil will leak from the gap between the seal teeth and the main shaft under pressure, making it difficult to fundamentally solve the problem of lubricating oil leakage in the bearing area. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related technologies.

[0004] Therefore, the first aspect of this utility model provides an inflatable oil sealing structure.

[0005] A second aspect of this invention provides a compressor.

[0006] In view of this, a pneumatic oil seal structure is provided according to a first aspect of the embodiments of this application, comprising: Rotor assembly; Bearing housing cover, the bearing housing cover is fitted onto the outside of the rotor assembly; Inflation channel, which is located on the bearing housing cover; A sealing assembly includes at least two sealing rings, which are fitted onto the outside of the rotor assembly. There is a gap between the inner surface of the sealing ring and the side wall of the rotor assembly, and the sealing ring is in communication with the air filling channel. The outer side of the first sealing ring is in contact with the first end of the bearing housing cover, and the outer side of the second sealing ring is in contact with the second end of the bearing housing cover. The first and second sealing rings seal the gap between the rotor assembly and the bearing housing cover to seal the bearing area.

[0007] In one feasible implementation, the rotor assembly includes a main shaft and a bearing assembly, the bearing assembly being disposed in the middle of the main shaft, and a bearing housing cover being fitted onto the outside of the bearing assembly.

[0008] In one feasible implementation, the pneumatic oil seal structure further includes: The first oil slinger ring is disposed on the side wall of the rotor assembly along the circumference of the rotor assembly. The first oil slinger ring is located outside the sealing ring and inside the bearing area. The blocking part is located on the end face of the sealing ring and covers the first oil slinger ring.

[0009] In one feasible implementation, the pneumatic oil seal structure further includes: The oil return channel is installed through the sealing ring. The first end of the oil return channel forms an oil inlet on the inner side of the sealing ring, and the second end of the oil return channel forms an oil outlet on the end face of the sealing ring. The oil outlet is located below the blocking part so that oil can return to the bearing area through the oil return channel.

[0010] In one feasible implementation, the pneumatic oil seal structure further includes: An inflation port assembly includes several inflation ports, which are arranged radially through the sealing ring and connected to the inflation channel.

[0011] In one feasible implementation, the pneumatic oil seal structure further includes: The second oil slinger ring is disposed on the side wall of the rotor assembly along the circumference of the rotor assembly and is located inside the air filling hole.

[0012] In one feasible implementation, the sealing ring includes: main body; The first comb tooth group includes several first comb teeth. The first comb teeth are arranged on the inner side wall of the main body along the circumference of the main body. There is a gap between the first comb teeth and the side wall of the rotor assembly. The first comb teeth are located on the first side of the air inlet. The second comb tooth group includes several second comb teeth. The second comb teeth are arranged circumferentially on the inner sidewall of the main body. There is a gap between the second comb teeth and the sidewall of the rotor assembly. The second comb teeth are located on the second side of the air inlet.

[0013] In one feasible implementation, the number of the first comb teeth is greater than the number of the second comb teeth.

[0014] In one feasible implementation, the first comb tooth group is located at one end of the body near the bearing area.

[0015] According to a second aspect of the embodiments of this application, a compressor is provided, including: an air-filled oil-sealed structure as described in any of the above technical solutions.

[0016] The gas-filled oil-sealed structure and compressor disclosed in this application have the following advantages compared with the prior art: The pneumatic oil seal structure provided in this application includes a rotor assembly, a bearing housing cover, a pneumatic channel, and a sealing assembly. The bearing housing cover and the rotor assembly enclose a bearing area. Two sealing rings seal the gaps between the two ends of the bearing housing cover and the rotor assembly, thereby sealing the bearing area and preventing lubricating oil from leaking out of the gap between the bearing housing cover and the rotor assembly. By connecting the sealing rings with the pneumatic channel on the bearing housing cover, isolation gas is introduced between the sealing rings and the rotor assembly through the pneumatic channel. The isolation gas forms a physical barrier and a pressure difference between the rotor assembly and the sealing rings, making the pressure outside the bearing area higher than the pressure inside the bearing area, forming a pressure gradient from the isolation gas side to the bearing area. Because the pressure is lower, the lubricating oil cannot break through the barrier formed by the isolation gas, thereby preventing lubricating oil from leaking out of the gap between the sealing ring and the rotor assembly. The lubricating oil is confined inside the bearing area. Without reducing the gap between the sealing structure and the rotor assembly, the possibility of lubricating oil leakage from the bearing area is reduced, avoiding lubricating oil waste, saving operation and maintenance costs, and keeping the unit site clean and tidy. Attached Figure Description

[0017] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A schematic structural diagram of an embodiment of the pneumatic oil seal structure provided in this application; Figure 2 A schematic structural diagram of the sealing ring at the first angle of an embodiment of the pneumatic oil seal structure provided in this application; Figure 3 A schematic structural diagram of the sealing ring at the second angle of an embodiment of the pneumatic oil seal structure provided in this application; Figure 4 for Figure 2 A magnified view of a portion of the image; in, Figures 1 to 4 The correspondence between the reference numerals and component names in the attached drawings is as follows: 11. Rotor assembly; 12. Bearing housing cover; 13. Air filling channel; 14. Sealing ring; 15. First oil slinger ring; 16. Blocking part; 17. Oil return channel; 18. Air filling hole; 19. Second oil slinger ring; 20. Lubricating oil chamber in bearing area; 111. Main shaft; 112. Support bearing; 113. Thrust bearing; 141. Main body; 142. First comb tooth group; 143. Second comb tooth group. Detailed Implementation

[0018] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0020] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0021] The preferred embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0022] like Figure 1 As shown, according to a first aspect of the embodiments of this application, an inflatable oil seal structure is proposed, comprising: a rotor assembly 11, a bearing housing cover 12, an inflation channel 13, and a sealing assembly; the bearing housing cover 12 is fitted onto the outside of the rotor assembly 11; the inflation channel 13 is disposed on the bearing housing cover 12; the sealing assembly includes at least two sealing rings 14, the sealing rings 14 are fitted onto the outside of the rotor assembly 11, and there is a gap between the inner side of the sealing rings 14 and the side wall of the rotor assembly 11; the outer side of the first sealing ring 14 is in contact with the first end of the bearing housing cover 12, and the outer side of the second sealing ring 14 is in contact with the second end of the bearing housing cover 12, the first sealing ring 14 and the second sealing ring 14 seal the gap between the rotor assembly 11 and the bearing housing cover 12 to seal the bearing area.

[0023] The pneumatic oil seal structure provided in this embodiment includes a rotor assembly 11, a bearing housing cover 12, a pneumatic channel 13, and a sealing assembly. The bearing housing cover 12 and the rotor assembly 11 form a bearing area. Two sealing rings 14 respectively seal the gaps between the two ends of the bearing housing cover 12 and the rotor assembly 11 to seal the bearing area, thereby preventing lubricating oil from leaking from the gap between the bearing housing cover 12 and the rotor assembly 11 and preventing lubricating oil leakage. By connecting the sealing rings 14 with the pneumatic channel 13 on the bearing housing cover 12, isolation gas is introduced between the sealing rings 14 and the rotor assembly 11 through the pneumatic channel 13. The isolation gas forms a physical barrier and a pressure difference between the rotor assembly 11 and the sealing ring 14, making the pressure outside the bearing area higher than the pressure inside the bearing area. This creates a pressure gradient from the isolation gas side to the bearing area. Because the pressure is lower, the lubricating oil cannot break through the barrier formed by the isolation gas, thus preventing the lubricating oil from leaking between the sealing ring 14 and the rotor assembly 11. The lubricating oil is confined inside the bearing area. Without reducing the gap between the sealing structure and the rotor assembly 11, the possibility of lubricating oil leakage from the bearing area is reduced, avoiding the waste of lubricating oil, saving operation and maintenance costs, and keeping the unit site clean and tidy.

[0024] It should be noted that the sealing ring 14 has a comb-tooth structure, and there is a micron-level gap between the sealing ring 14 and the rotor assembly 11. The micron-level gap between the sealing ring 14 and the rotor assembly 11 forms a throttling effect to achieve sealing. By connecting the sealing ring 14 with the air charging channel 13 of the bearing housing cover 12, the pressure difference inside and outside the bearing area can be adjusted by using the isolation gas. There is no need to reduce the gap between the sealing structure and the rotor assembly 11, which reduces the risk of the sealing ring 14 and the rotor assembly 11 scraping against each other during unit operation and ensures the safety and continuity of unit operation.

[0025] like Figure 1 As shown, in one feasible embodiment, the rotor assembly 11 includes a main shaft 111 and a bearing assembly. The bearing assembly is disposed in the middle of the main shaft 111 and rotates synchronously with the main shaft 111. The bearing housing cover 12 is fitted onto the outside of the bearing assembly.

[0026] In this technical solution, the bearing assembly is installed in the middle of the spindle 111 and is located between the spindle 111 and the bearing housing cover 12 to support the spindle 111 and ensure the stability of the spindle 111 during operation; the bearing housing cover 12 is fitted on the outside of the bearing assembly and the sealing assembly seals the bearing area to isolate an independent bearing area on the spindle 111, which is convenient for disassembly and maintenance.

[0027] Furthermore, the bearing housing cover 12 is provided with a bearing lubrication oil cavity 20, and the lubricating oil splashed out by the bearing assembly during operation enters the bearing lubrication oil cavity 20. The bearing assembly includes a support bearing 112 and a thrust bearing 113. The support bearing 112 is fitted on the outside of the main shaft 111. The inner ring of the support bearing 112 is tightly fitted with the main shaft 111, and the outer ring of the support bearing 112 is tightly fitted and locked with the inner wall of the bearing housing cover 12 to support the rotation of the main shaft 111 and limit the radial displacement of the main shaft 111. The thrust bearing 113 is fitted on the outside of the main shaft 111. The inner ring of the thrust bearing 113 is tightly fitted with the main shaft 111, and the outer ring of the thrust bearing 113 is tightly fitted and locked with the inner wall of the bearing housing cover 12 to support the rotation of the main shaft 111 and limit the axial displacement of the main shaft 111 to ensure the stability of the main shaft 111 during operation.

[0028] like Figure 1 As shown, in one feasible embodiment, the pneumatic oil seal structure further includes: a first oil slinger ring 15 and a blocking portion 16; the first oil slinger ring 15 is disposed on the side wall of the rotor assembly 11 along the circumference of the rotor assembly 11, the first oil slinger ring 15 is located outside the sealing ring 14, and the first oil slinger ring 15 is located inside the bearing area; the blocking portion 16 is disposed on the end face of the sealing ring 14, and the blocking portion 16 covers the first oil slinger ring 15.

[0029] In this technical solution, a first oil slinger ring 15 is provided on the main shaft 111 of the rotor assembly 11, and a blocking part 16 is provided on the outside of the first oil slinger ring 15 to block the lubricating oil splashed when the main shaft 111 and the bearing assembly rotate, so as to prevent the lubricating oil from splashing into the space between the main shaft 111 and the sealing ring 14 without changing the gap between the sealing structure and the main shaft 111. Thus, without increasing the risk of collision between the rotor and the stator, the possibility of leakage from the sealing ring 14 and the main shaft 111 is further reduced.

[0030] like Figures 2 to 4 As shown, in one feasible embodiment, the pneumatic oil seal structure further includes: an oil return channel 17, which is disposed through the sealing ring 14. The first end of the oil return channel 17 forms an oil inlet on the inner side of the sealing ring 14, and the second end of the oil return channel 17 forms an oil outlet on the end face of the sealing ring 14. The oil outlet is located below the blocking part 16 so as to return oil to the bearing area through the oil return channel 17.

[0031] In this technical solution, an oil return channel 17 is provided on the sealing ring 14. When it is unavoidable that a small amount of lubricating oil enters between the sealing ring 14 and the main shaft 111, the oil return channel 17 is used to guide the lubricating oil that has entered between the sealing ring 14 and the main shaft 111 back into the bearing area, which further reduces the possibility of lubricating oil leaking from between the sealing ring 14 and the main shaft 111 and improves the rotational sealing effect of the sealing structure between the main shaft 111 and the bearing housing cover 12.

[0032] Furthermore, the oil return channel 17 is located at the lowest point of the circumference geometry of the sealing ring 14, ensuring that the lubricating oil between the sealing ring 14 and the spindle 111 converges into the oil return channel 17 under the influence of gravity, making the return of lubricating oil more thorough.

[0033] like Figure 1 As shown, in one feasible embodiment, the pneumatic oil seal structure further includes: a group of air inlets and an air inlet channel 13; the group of air inlets includes a plurality of air inlets 18, which are radially disposed on the sealing ring 14, and the air inlets 18 are connected to the air inlet channel 13.

[0034] In this technical solution, the air inlet 18 penetrates the sealing ring 14 radially. By connecting the air inlet 18 with the air inlet channel 13, the isolation gas passes through the air inlet channel 13 and the air inlet 18 and enters between the sealing ring 14 and the main shaft 111, forming a high-pressure isolation barrier between the sealing ring 14 and the main shaft 111. This makes the pressure outside the bearing area higher than the pressure inside the bearing area, thus preventing lubricating oil leakage caused by an increase in the amount of flue gas inside the bearing area.

[0035] Furthermore, such as Figure 3 Several air holes 18 are arranged around the circumference of the sealing ring 14 to improve the uniformity of air inflation around the sealing ring 14.

[0036] In some examples, such as Figure 3 The oil return channel 17 is located between the two air inlets 18 at the bottom of the sealing ring 14. The double air inlets 18 lock the oil and cooperate with the bottom oil return channel 17 to collect the oil. While blocking most of the lubricating oil leakage, the residual lubricating oil can be recovered by the oil return channel 17.

[0037] like Figure 1 As shown, in one feasible embodiment, the pneumatic oil seal structure further includes a second oil slinger ring 19, which is disposed on the side wall of the rotor assembly 11 along the circumference of the rotor assembly 11 and is located inside the air inlet 18.

[0038] In this technical solution, the second oil slinger ring 19 is disposed in the air inlet 18 to further prevent the lubricating oil between the sealing ring 14 and the main shaft 111 from continuing to flow to the outside of the bearing area, so that the lubricating oil between the sealing ring 14 and the main shaft 111 gathers between the first oil slinger ring 15 and the second oil slinger ring 19, which is conducive to the lubricating oil flowing smoothly back to the bearing area through the oil return channel 17.

[0039] like Figure 2 As shown, in one feasible embodiment, the sealing ring 14 includes: a body 141, a first comb tooth group 142, and a second comb tooth group 143; the first comb tooth group 142 includes a plurality of first comb teeth, which are arranged circumferentially on the inner sidewall of the body 141, and there is a gap between the first comb teeth and the sidewall of the rotor assembly 11, and the first comb teeth are located on the first side of the air inlet 18; the second comb tooth group 143 includes a plurality of second comb teeth, which are arranged circumferentially on the inner sidewall of the body 141, and there is a gap between the second comb teeth and the sidewall of the rotor assembly 11, and the second comb teeth are located on the second side of the air inlet 18.

[0040] In this technical solution, the first comb tooth and the second comb tooth form a double physical barrier to adapt to the fluctuations in oil pressure inside the bearing area and external environmental pressure. By setting the comb tooth on the side of the air inlet 18 away from the bearing area, the axial leakage path of the lubricating oil is blocked from the outside of the air inlet 18, thereby further improving the sealing effect of the sealing ring 14.

[0041] In some examples, the first and second comb teeth are made of elastic material, which can fit against the side wall surface of the spindle 111 to compensate for the gap changes between the spindle 111 and the sealing ring 14 caused by machining errors or thermal deformation, thereby improving the sealing reliability.

[0042] like Figure 2 As shown, in one feasible implementation, the number of first comb teeth is greater than the number of second comb teeth.

[0043] In this technical solution, the number of comb teeth in the first comb tooth group 142 is different from that in the second comb tooth group 143. An asymmetrical comb tooth structure is adopted so that the flow resistance of the isolation gas to both sides after entering from the air inlet 18 is different, thereby controlling the flow direction of the isolation gas.

[0044] like Figure 2 As shown, in one feasible embodiment, the first comb tooth group 142 is located at one end of the body 141 near the bearing area.

[0045] In this technical solution, the number of teeth on both sides of the air inlet 18 is not the same, and the number of teeth on the first comb group 142 on the side closer to the bearing area is less, so that the isolation gas flows into the bearing area as much as possible, thereby sealing the lubricating oil inside the bearing area.

[0046] According to a second aspect of this application, a compressor is proposed, comprising: an air-filled oil-sealed structure as described in any of the above technical solutions.

[0047] The compressor provided in this application includes the gas-filled oil seal structure of any of the above-mentioned technical solutions. Therefore, the compressor has all the beneficial effects of the gas-filled oil seal structure of the above-mentioned technical solutions, which will not be elaborated here.

[0048] Specifically, the compressor may include an MCO compressor.

[0049] It will be readily understood by those skilled in the art that the above embodiments can be freely combined and superimposed without conflict.

[0050] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above are merely preferred embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. A pneumatic oil-sealing structure, characterized in that, The pneumatic oil seal structure includes: Rotor assembly; A bearing housing cover, which is fitted onto the outside of the rotor assembly; An inflation channel is provided on the bearing housing cover; A sealing assembly, comprising at least two sealing rings, the sealing rings being fitted onto the outer side of the rotor assembly, a gap existing between the inner side of the sealing rings and the side wall of the rotor assembly, and the sealing rings communicating with the inflation channel; The outer side of the first sealing ring is in contact with the first end of the bearing housing cover, and the outer side of the second sealing ring is in contact with the second end of the bearing housing cover. The first sealing ring and the second sealing ring seal the gap between the rotor assembly and the bearing housing cover to seal the bearing area.

2. The pneumatic oil seal structure according to claim 1, characterized in that, The rotor assembly includes a main shaft and a bearing assembly, the bearing assembly being disposed in the middle of the main shaft, and the bearing housing cover being fitted onto the outside of the bearing assembly.

3. The pneumatic oil seal structure according to claim 1, characterized in that, The pneumatic oil seal structure also includes: The first oil slinger ring is disposed on the side wall of the rotor assembly along the circumference of the rotor assembly. The first oil slinger ring is located outside the sealing ring and inside the bearing area. A blocking part is disposed on the end face of the sealing ring, and the blocking part covers the first oil slinger ring.

4. The pneumatic oil seal structure according to claim 3, characterized in that, The pneumatic oil seal structure also includes: An oil return channel is provided through the sealing ring. The first end of the oil return channel forms an oil inlet on the inner side of the sealing ring, and the second end of the oil return channel forms an oil outlet on the end face of the sealing ring. The oil outlet is located below the blocking part so as to return oil to the bearing area through the oil return channel.

5. The pneumatic oil seal structure according to claim 1, characterized in that, The pneumatic oil seal structure also includes: An inflation hole assembly, comprising a plurality of inflation holes, wherein the inflation holes are radially disposed on the sealing ring and are connected to the inflation channel.

6. The pneumatic oil seal structure according to claim 5, characterized in that, The pneumatic oil seal structure also includes: The second oil slinger ring is disposed on the side wall of the rotor assembly along the circumference of the rotor assembly and is located inside the air inlet.

7. The pneumatic oil seal structure according to claim 6, characterized in that, The sealing ring includes: main body; The first comb tooth group includes a plurality of first comb teeth, which are arranged circumferentially on the inner sidewall of the main body. There is a gap between the first comb teeth and the sidewall of the rotor assembly, and the first comb teeth are located on the first side of the air inlet. The second comb tooth group includes a plurality of second comb teeth, which are arranged circumferentially on the inner sidewall of the main body. There is a gap between the second comb teeth and the sidewall of the rotor assembly, and the second comb teeth are located on the second side of the air inlet.

8. The pneumatic oil seal structure according to claim 7, characterized in that, The number of the first comb teeth is greater than the number of the second comb teeth.

9. The pneumatic oil seal structure according to claim 8, characterized in that, The first comb tooth group is located at one end of the main body near the bearing area.

10. A compressor, characterized in that, Including the pneumatic oil seal structure as described in any one of claims 1 to 9.

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