An independent lubrication system for bearings of an ultra-high temperature single-screw compressor

Abstract

This ultra-high temperature single-screw compressor bearing independent lubrication system includes an oil inlet pipe, an oil inlet passage, a mechanical seal, a bearing housing, a cover plate, an oil return pipe, and an oil cooler. The oil cooler is located outside the single-screw compressor housing. The mechanical seal is located inside the bearing housing of the single-screw compressor housing, isolating the compression chamber inside the single-screw compressor housing from the bearing cavity inside the bearing housing. The cover plate is located outside the bearing housing, sealing the bearing cavity from the outside. The bearing cavity houses the bearing. The oil inlet pipe is located outside the bearing housing, with one end connected to the oil outlet of the oil cooler and the other end connected to the oil inlet of the oil inlet passage. The oil outlet of the oil inlet passage is connected to the oil inlet on the bearing housing. One end of the oil return pipe is connected to the inside of the bearing housing, and the other end is connected to the oil inlet of the oil cooler. This system effectively controls the bearing lubricating oil temperature, and the operating conditions during use fully meet the normal operating conditions of the bearing, extending the bearing life.

Description

Technical Field

[0001] This utility model relates to the field of single-screw compressors, specifically to an independent lubrication system for bearings of an ultra-high temperature single-screw compressor. Background Technology

[0002] A single-screw compressor consists of a cylindrical screw and two symmetrically arranged planar star wheels, forming a meshing pair housed within a casing. The screw grooves, the inner wall of the casing (cylinder), and the star wheel teeth constitute a closed volume. Power is transmitted to the screw shaft, which drives the star wheels to rotate. Gas enters the screw grooves from the intake chamber, is compressed, and then discharged through the exhaust port and exhaust chamber. The star wheels function similarly to the piston in a reciprocating piston compressor; as the star wheel teeth move relative to each other within the screw grooves, the closed volume gradually decreases, compressing the gas.

[0003] During operation, single-screw compressors require liquid injection into the compressor housing. Traditional compressors share a single chamber for both liquid injection and bearing lubrication. However, in ultra-high temperature environments, this can lead to reduced oil viscosity, oil deterioration, and the formation of sludge. This not only results in insufficient heat for industrial ultra-high temperature applications but also directly impacts bearing lifespan. According to GB / T24608-2023, GB / T276-1994, and JB / T8921-1999, the general temperature resistance of bearings is between 80°C and 120°C. Mineral oil-lubricated bearings have a normal operating temperature limit of 80°C-90°C. High-temperature grease or synthetic lubricant bearings can withstand short periods at 120°C, but long-term operation must be kept below 100°C. If the temperature exceeds 120°C, the following problems will occur: lubricant oxidation and failure, leading to increased friction and accelerated wear; annealing of the bearing steel, resulting in decreased resistance and reduced load-bearing capacity. These are all reasons for premature bearing lifespan. Although ceramic bearings and special alloy bearings can withstand temperatures of 300°-1200°, they are expensive and have poor load-bearing capacity, which cannot meet the operating conditions of compressors.

[0004] In view of this, the inventor conducted in-depth research on the aforementioned deficiencies in the prior art, which led to the creation of this case. Utility Model Content

[0005] To address the aforementioned technical challenges, we propose an independent lubrication system for bearings in ultra-high temperature single-screw compressors. This system effectively controls the temperature of the bearing lubricating oil, and the operating conditions during use fully meet the normal operating requirements of the bearings, thus extending their lifespan.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] An independent lubrication system for bearings of an ultra-high temperature single-screw compressor includes an oil inlet pipe, an oil inlet passage, a mechanical seal, a bearing housing, a cover plate, an oil return pipe, and an oil cooler. The oil cooler is located outside the single-screw compressor housing. The mechanical seal is located inside the bearing housing of the single-screw compressor housing, separating the compression chamber inside the housing from the bearing cavity inside the housing. The cover plate is located outside the bearing housing, sealing the bearing cavity from the outside. A bearing is housed within the bearing cavity. The oil inlet pipe is located outside the bearing housing, with one end connected to the oil outlet of the oil cooler and the other end connected to the oil inlet of the oil inlet passage. The oil outlet of the oil inlet passage communicates with the oil inlet on the bearing housing. One end of the oil return pipe communicates with the inside of the bearing housing, and the other end connects to the oil inlet of the oil cooler.

[0008] When the single screw compressor is not started, the oil cooler is already started. Low-temperature and high-pressure lubricating oil is transported to the bearing cavity in the bearing housing through the oil inlet pipe and oil inlet passage. The lubricating oil with increased temperature returns to the oil cooler through the oil pipe for cooling. After cooling, it is drawn into the bearing cavity in the bearing housing by the oil cooler and recirculated.

[0009] Preferably, the oil cooler includes an oil tank, a motor, a gear pump, a cooling fan, and a heat exchanger. One end of the motor is connected to the gear pump via a coupling, and the other end is connected to the cooling fan via a coupling. The exhaust side of the cooling fan faces the heat exchanger. The gear pump is connected to the oil tank via an oil pipe, and the heat exchanger is connected to the return oil pipe.

[0010] Preferably, the oil cooler is further provided with a filter, and the filter is installed on the oil pipe connected to the outlet of the gear pump.

[0011] Preferably, the bearing housing has an oil inlet hole through the side, and the oil inlet end of the oil inlet passage is sealed to the oil inlet hole. Low-temperature and high-pressure lubricating oil is delivered to the bearing cavity through the oil inlet pipe, the oil inlet passage and the oil inlet hole on the bearing housing.

[0012] Preferably, the cover plate is provided with an oil outlet hole, and the oil outlet hole is sealed to the oil return pipe. The lubricating oil with increased temperature returns to the oil cooler through the oil outlet hole and the oil return pipe on the cover plate for cooling.

[0013] Preferably, an oil inlet ferrule is connected between the oil inlet pipe and the oil inlet passage.

[0014] Preferably, the oil return pipe is connected to the bearing housing via an oil return ferrule connector.

[0015] Preferably, a flow regulating valve is provided on the oil pipe connecting the filter and the heat exchanger.

[0016] Preferably, the return oil pipe is also equipped with a thermometer and a pressure gauge.

[0017] Preferably, the oil tank is also equipped with a level gauge.

[0018] Through the above technical solution, this utility model separates the bearing cavity and compression cavity using a mechanical seal. By incorporating a mechanical seal, oil cooler, independent piping, and process ports, low-temperature lubricating oil is delivered to the bearing cavity for forced circulation, ensuring the oil temperature in the bearing cavity remains below 70°C. This not only solves the problem of insufficient ultra-high temperature heat sources in industrial applications, increasing energy efficiency, but also extends bearing life, reduces downtime caused by bearing damage, and addresses the issue of bearings being unusable under high-temperature conditions. Thus, it achieves the goals of novel design, reasonable structure, and excellent application results. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of an independent lubrication system for bearings of an ultra-high temperature single-screw compressor disclosed in an embodiment of this utility model.

[0021] Figure 2 This is a structural diagram of the oil cooler in an independent lubrication system for a bearing of an ultra-high temperature single-screw compressor, as disclosed in an embodiment of this utility model.

[0022] Figure 3 This is a cross-sectional view of the single-screw compressor housing in an independent lubrication system for bearings of an ultra-high temperature single-screw compressor disclosed in an embodiment of this utility model.

[0023] Figure 4 This is a cross-sectional view of the bearing housing of an independent lubrication system for an ultra-high temperature single-screw compressor bearing disclosed in an embodiment of this utility model;

[0024] Figure 5 This is a schematic diagram of the working principle of the oil cooler system in an independent lubrication system for the bearings of an ultra-high temperature single-screw compressor, as disclosed in an embodiment of this utility model.

[0025] The numbers in the diagram represent the names of the corresponding components:

[0026] 1. Oil inlet pipe 2. Oil inlet passage 3. Mechanical seal 4. Bearing housing 41. Bearing cavity 42. Bearing 5. Cover plate 6. Oil return pipe 7. Oil cooler 71. Oil tank 72. Motor 73. Gear pump 74. Cooling fan 75. Heat exchanger 76. Oil cooler return pipe 77. Subcooled oil cooler inlet pipe 8. Single screw compressor housing 81. Compression chamber 9. Filter 10. Oil inlet ferrule fitting 11. Oil return ferrule fitting 12. Flow regulating valve 13. Thermometer 14. Pressure gauge 15. Level gauge Detailed Implementation

[0027] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0028] The present invention will be further described in detail below with reference to embodiments and specific implementation methods.

[0029] Example

[0030] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, an independent lubrication system for the bearings of an ultra-high temperature single-screw compressor includes an oil inlet pipe 1, an oil inlet passage 2, a mechanical seal 3, a bearing housing 4, a cover plate 5, an oil return pipe 6, and an oil cooler 7. The oil cooler 7 is located outside the single-screw compressor housing 8. The mechanical seal 3 is located inside the bearing housing 8, separating the compression chamber 81 inside the housing 8 from the bearing cavity 41 inside the bearing housing 4. The cover plate 5 is located outside the bearing housing 4, sealing the bearing cavity 41 from the outside. A bearing 42 is installed inside the bearing cavity 41. The oil inlet pipe 1 is located outside the bearing housing 4, and one end of the oil inlet pipe 1 is connected to the oil cooler 7. The oil outlet is connected, and the other end of the oil inlet pipe 1 is connected to the oil inlet port of the oil inlet passage 2. The oil outlet port of the oil inlet passage 2 is internally connected to the bearing housing 4. One end of the oil return pipe 6 is connected to the oil outlet port on the bearing housing 4, and the other end of the oil return pipe 6 is connected to the oil inlet of the oil cooler 7. The oil cooler 7 includes an oil tank 71, a motor 72, a gear pump 73, a cooling fan 74, and a heat exchanger 75. One end of the motor 72 is connected to the gear pump 73 through a coupling, and the other end is connected to the cooling fan 74 through a coupling. The exhaust side of the cooling fan 74 is arranged facing the heat exchanger 75. The gear pump 73 is connected to the oil tank 71 through an oil pipe, and the heat exchanger 75 is connected to the oil return pipe 6.

[0031] When the single screw compressor is not started, the oil cooler 7 has already started. Low-temperature and high-pressure lubricating oil is transported to the bearing cavity 41 in the bearing housing 4 through the oil inlet pipe 1 and the oil inlet passage 2. The lubricating oil with increased temperature returns to the oil cooler 7 through the oil cooler return pipe 76 for cooling. After cooling, it is drawn into the bearing cavity 41 in the bearing housing 4 through the oil cooler inlet pipe 77.

[0032] like Figure 5 As shown, the oil cooler 7 is also equipped with a filter 9, which is located on the oil pipe connected to the outlet of the gear pump 73. This allows for the filtration of the lubricating oil passing through the bearing cavity 41, removing impurities and maintaining the cleanliness of the lubricating oil.

[0033] The bearing housing 4 has an oil inlet hole on its side, and the oil inlet end of the oil inlet passage 2 is sealed to the oil inlet hole. Low-temperature, high-pressure lubricating oil is transported to the bearing cavity 41 through the oil inlet pipe 1, the oil inlet passage 2, and the oil inlet hole on the bearing housing 4. The cover plate 5 is provided with an oil outlet hole, which is sealed to the oil return pipe 6. The lubricating oil with increased temperature returns to the oil cooler 7 for cooling through the oil outlet hole on the cover plate 5 and the oil return pipe 6.

[0034] Meanwhile, to ensure a more secure connection between the oil inlet pipe 1 and the oil inlet passage 2, and to facilitate later disassembly and maintenance, an oil inlet ferrule connector 10 is connected between the oil inlet pipe 1 and the oil inlet passage 2. The oil return pipe 6 is connected to the bearing housing 4 via an oil return ferrule connector 11, thereby enabling a more reliable and secure connection between the oil return pipe 6 and the oil outlet of the bearing housing 4.

[0035] In addition, a flow regulating valve 12 is installed on the oil pipe connecting the filter 9 and the heat exchanger 75, so that the flow rate of the lubricating oil can be regulated and controlled according to actual needs. In order to monitor the temperature and pressure of the lubricating oil in real time, a thermometer 13 and a pressure gauge 14 are also installed on the oil return pipe 6. A level gauge 15 is also installed on the oil tank 71 so that the level of the lubricating oil in the oil tank 71 can be monitored in real time.

[0036] The working principle of the independent lubrication system for the bearings of this ultra-high temperature single-screw compressor is as follows: When the single-screw compressor is about to start but has not yet started, the oil cooler 7 starts first. The gear pump 73 delivers low-temperature, high-pressure lubricating oil to the bearing cavity 41 through the oil inlet pipe 1, oil inlet passage 2, oil inlet ferrule 11, and the oil inlet hole in the bearing housing 4. After the single-screw compressor starts, although the lubricating oil in the bearing cavity 41 will be heated, the lubricating oil with a higher temperature will return to the oil cooler 7 through the oil outlet hole on the cover plate 5, the return ferrule 11, and the return pipe 6 for cooling.

[0037] In other words, after the single-screw compressor starts, the bearing chamber 41, which is separated from the compressor compression chamber 81, is continuously supplied with cooling oil. When the single-screw compressor stops, the compressor stops first, and the oil cooler continues to work, repeating the above-mentioned lubricating oil circulation process, until the temperature of the compression chamber drops, and then the gear pump 73 of the oil cooler 7 stops working.

[0038] In this example, this invention separates the bearing cavity 41 and the compression cavity 81 using a mechanical seal. Through the design of a mechanical seal 3, an oil cooler 7, independent pipelines, and process holes, low-temperature lubricating oil is delivered to the bearing cavity 41 for forced circulation, ensuring that the oil temperature in the bearing cavity 41 is below 70℃. Currently, mainstream ultra-high temperature single-screw compressors, due to the need to consider the bearing's heat capacity, typically have exhaust temperatures concentrated between 95℃ and 120℃. However, industrial sectors such as chemical, food processing, and metallurgy generally require heat sources of around 150℃. Currently, heat pump products capable of stably outputting heat sources above 150℃ are still few and far between. This technical solution, by separating the bearing cavity 41 and the compression cavity 81, can meet the requirement of heat source temperatures above 150℃. This not only solves the problem of insufficient ultra-high temperature heat sources in industrial applications and increases energy efficiency, but also extends bearing life, reduces downtime caused by bearing damage, and solves the problem of bearings being unusable under high-temperature conditions. Thus, it achieves the goals of novel design, reasonable structure, and good application effect.

[0039] The above description is only a preferred embodiment of the independent lubrication system for the bearing of an ultra-high temperature single screw compressor according to this utility model. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of this utility model, and these all fall within the protection scope of this utility model.

Claims

1. An independent lubrication system for bearings of an ultra-high temperature single-screw compressor, characterized in that, The system includes an oil inlet pipe, an oil inlet passage, a mechanical seal, a bearing housing, a cover plate, an oil return pipe, and an oil cooler. The oil cooler is located outside the single-screw compressor housing. The mechanical seal is located inside the bearing housing of the single-screw compressor housing, separating the compression chamber inside the housing from the bearing cavity inside the housing. The cover plate is located outside the bearing housing, sealing the bearing cavity from the outside. A bearing is installed inside the bearing cavity. The oil inlet pipe is located outside the housing, with one end connected to the oil outlet of the oil cooler and the other end connected to the oil inlet of the oil inlet passage. The oil outlet of the oil inlet passage communicates with the oil inlet on the bearing housing. One end of the oil return pipe communicates with the inside of the bearing housing, and the other end connects to the oil inlet of the oil cooler. When the single screw compressor is not started, the oil cooler is already started. Low-temperature and high-pressure lubricating oil is transported to the bearing cavity in the bearing housing through the oil inlet pipe and oil inlet passage. The lubricating oil with increased temperature returns to the oil cooler through the oil pipe for cooling. After cooling, it is drawn into the bearing cavity in the bearing housing by the oil cooler and recirculated.

2. The independent lubrication system for bearings of an ultra-high temperature single-screw compressor according to claim 1, characterized in that, The oil cooler includes an oil tank, a motor, a gear pump, a cooling fan, and a heat exchanger. One end of the motor is connected to the gear pump via a coupling, and the other end is connected to the cooling fan via a coupling. The exhaust side of the cooling fan faces the heat exchanger. The gear pump is connected to the oil tank via an oil pipe, and the heat exchanger is connected to the return oil pipe.

3. The independent lubrication system for bearings of an ultra-high temperature single-screw compressor according to claim 2, characterized in that, The oil cooler is also equipped with a filter, which is located on the oil pipe connected to the outlet of the gear pump.

4. The independent lubrication system for bearings of an ultra-high temperature single-screw compressor according to claim 3, characterized in that, The bearing housing has an oil inlet hole through its side. The oil inlet end of the oil inlet passage is sealed to the oil inlet hole. Low-temperature and high-pressure lubricating oil is transported to the bearing cavity through the oil inlet pipe, the oil inlet passage and the oil inlet hole on the bearing housing.

5. The independent lubrication system for bearings of an ultra-high temperature single-screw compressor according to claim 4, characterized in that, The cover plate is provided with an oil outlet hole, which is sealed to the oil return pipe. The lubricating oil with increased temperature returns to the oil cooler through the oil outlet hole and the oil return pipe on the cover plate for cooling.

6. The independent lubrication system for bearings of an ultra-high temperature single-screw compressor according to claim 5, characterized in that, An oil inlet ferrule is connected between the oil inlet pipe and the oil inlet passage.

7. The independent lubrication system for bearings of an ultra-high temperature single-screw compressor according to claim 6, characterized in that, The oil return pipe is connected to the bearing housing by an oil return ferrule connector.

8. The independent lubrication system for bearings of an ultra-high temperature single-screw compressor according to claim 7, characterized in that, A flow regulating valve is installed on the oil pipe connecting the filter and the heat exchanger.

9. The independent lubrication system for bearings of an ultra-high temperature single-screw compressor according to claim 8, characterized in that, The return oil pipe is also equipped with a thermometer and a pressure gauge.

10. The independent lubrication system for bearings of an ultra-high temperature single-screw compressor according to claim 9, characterized in that, The oil tank is also equipped with a level gauge.

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