A fully-cooled system for a gas compressor

Abstract

The present application relates to the technical field of gas compressor, and more particularly to a sufficient cooling system of a gas compressor. An inter-stage cooling pipe is arranged in an inter-stage connecting pipe, the inter-stage cooling pipe is connected with an inter-stage cooling system, the inter-stage cooling system comprises a condenser connected with a two-stage gas outlet of a two-stage compression pump head through a pipeline, and an outlet of the condenser is connected with an inlet of the inter-stage cooling pipe through another branch of a second expansion valve; a steel sheet groove is arranged on an inner surface of the shell along a circumference, an inner surface of the steel sheet groove is provided with a continuously arranged air guide groove, a cooling gas inlet is arranged on the shell corresponding to a front end position of the air guide groove, and a cooling gas outlet is arranged on the shell of the stator. A boss is arranged on a side wall of the bearing block close to the motor cavity, and a plurality of heat dissipation channels are arranged in the boss along the circumference to connect the inner hole of the bearing block with the motor cavity. The present application can improve the rotating speed, increase the exhaust capacity, improve the refrigeration efficiency, avoid the accumulation of heat in the motor cavity, and protect the radial air bearing and the motor.

Description

Technical fields:

[0001] This invention relates to the field of gas compressor technology, and more particularly to a fully cooling system for a gas compressor. Background technology:

[0002] Currently, in two-stage high-speed centrifugal air compressors, two compression chambers are simultaneously driven by a motor to pressurize air. The two compression chambers are connected by a connecting pipe. The gas discharged from the first compression chamber enters the second compression chamber through the connecting pipe for further pressurization, forming high-pressure gas. This type of compressor is often used in air conditioning systems. However, in actual use, it still has the following disadvantages:

[0003] Firstly, air conditioning systems have requirements for the compressor's outlet air temperature. Under the premise of ensuring the air output, the secondary outlet air temperature is generally required to be about 10°C higher than the room temperature. The compressor speed is positively correlated with the outlet air temperature. If a high speed, large air output, and low outlet air temperature are desired, the inlet air temperature needs to be low. The inlet air temperature involves both the inlet air temperature of the primary compression chamber and the inlet air temperature of the secondary compression chamber. Currently, it is not easy to control the inlet air temperature of the secondary compression chamber, which leads to a decrease in speed, a decrease in exhaust volume, and a decrease in cooling efficiency.

[0004] Secondly, the current cooling of motors mainly relies on water cooling systems. By setting up water cooling channels inside the motor housing, cooling water flows through the channels and carries away heat through heat exchange with the stator and housing. This water cooling system can only quickly cool the part of the stator close to the housing, and then relies on heat conduction to cool slowly from the outside to the inside. The cooling effect is poor, and it cannot quickly dissipate the heat inside the stator, causing heat to accumulate inside the stator. This can easily lead to motor overheating and shutdown, affecting the motor's lifespan.

[0005] Third, the current cooling effect of radial air bearings is poor. They mainly rely on natural ventilation and heat dissipation through the gap between the bearing and the inner hole of the bearing housing. The bearings have short lifespans and are easily damaged, which cannot meet the long-term working environment of high-speed centrifugal air compressors.

[0006] In summary, the aforementioned problems encountered during the use of two-stage gas compressors have become urgent technical challenges that need to be addressed within the industry. Summary of the Invention:

[0007] To overcome the shortcomings of existing technologies, this invention provides a fully cooling system for a gas compressor, which solves the problems of reduced speed, reduced exhaust volume, and reduced cooling efficiency caused by the difficulty in controlling the intake temperature of the secondary compression chamber. It also solves the problems of poor cooling effect and inability to quickly dissipate heat from the stator using water cooling systems in previous motors, as well as the problems of poor cooling effect, short lifespan, and easy damage of radial air bearings.

[0008] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0009] A fully cooled gas compressor system includes a motor. A primary compressor head and a secondary compressor head are connected to the motor's end. The primary outlet of the primary compressor head and the secondary inlet of the secondary compressor head are connected via an interstage connecting pipe. The motor includes a housing, within which a stator and a main shaft are housed. The two ends of the main shaft are supported by bearing seats, and radial air bearings are provided between the bearing seats and the main shaft.

[0010] The interstage connecting pipe is equipped with an interstage cooling pipe, which is connected to the interstage cooling system. The interstage cooling system includes a condenser connected to the secondary outlet of the secondary compression pump head via a pipeline. One branch of the condenser's liquid outlet is connected to the inlet of the evaporator via a first expansion valve. The evaporator's gas outlet is connected to the primary inlet of the primary compression pump head via a pipeline. The other branch of the condenser's liquid outlet is connected to the inlet of the interstage cooling pipe via a second expansion valve. The gas outlet of the interstage cooling pipe is connected to the primary inlet of the primary compression pump head via a pipeline.

[0011] The inner surface of the housing is provided with a steel plate groove along the circumference. The steel plate groove is used to install and fix the steel plates of the stator. The steel plates are fitted and sealed with the steel plate groove. The inner surface of the steel plate groove is provided with a continuous air guide groove. The air guide groove is spaced apart from the front end. A cooling gas inlet is provided on the housing corresponding to the front end of the air guide groove. An exhaust groove is provided on the inner surface of the housing corresponding to the rear end of the air guide groove to discharge gas to one side of the stator. A cooling gas outlet is provided on the housing of the other stage of the stator. The cooling gas inlet and the cooling gas outlet are respectively connected to the interstage connecting pipe through pipelines.

[0012] The bearing housing has a boss on the side wall near the motor cavity. Several heat dissipation channels are arranged along the circumference inside the boss to connect the inner hole of the bearing housing with the motor cavity. The cooling gas in the motor cavity enters the inner hole of the bearing housing through the heat dissipation channels to cool the radial air bearing.

[0013] The condenser is used to cool the high-temperature gas discharged from the secondary outlet and turn the gas into a liquid.

[0014] The first expansion valve and the second expansion valve are used to atomize the liquid discharged from the condenser.

[0015] The evaporator is used to vaporize the mist discharged from the first expansion valve and cool the surrounding air to blow out cold air.

[0016] The interstage cooling pipe exchanges heat within the interstage connecting pipe. The mist discharged from the second expansion valve within the interstage cooling pipe is vaporized, and the surrounding air is cooled, thus reducing the temperature of the gas within the interstage connecting pipe.

[0017] The interstage cooling pipes are arranged in a U-shape, coil shape, or labyrinth shape inside the interstage connecting pipes.

[0018] The edges of the steel sheet and the steel sheet groove are sealed with sealant.

[0019] The shape of the air guide groove includes continuously arranged S-shape, W-shape or spiral shape.

[0020] The present invention adopts the above-described solution and has the following advantages:

[0021] By installing an interstage cooling pipe inside the interstage connecting pipe, the liquid discharged from the condenser is atomized by the second expansion valve and enters the interstage cooling pipe to exchange heat with the gas in the interstage connecting pipe. On the one hand, the atomized gas discharged from the second expansion valve is vaporized and then introduced into the first-stage inlet of the two-stage gas compressor. On the other hand, the surrounding air is cooled to lower the temperature of the gas in the interstage connecting pipe, thereby reducing the temperature of the gas entering the second-stage inlet. Ultimately, this can increase the rotation speed, increase the exhaust volume, and improve the refrigeration efficiency.

[0022] By providing continuously arranged air guide grooves within the steel plate grooves on the inner surface of the housing, and an exhaust groove corresponding to the tail end of the air guide grooves on the inner surface of the housing to discharge gas to one side of the stator, a cooling gas outlet is provided on the other side of the stator housing. Cooling gas in the interstage connecting pipe can enter the air guide grooves through the cooling gas inlet via the pipeline, directly cooling the steel plates of the stator. Then, the cooling gas in the air guide grooves is discharged to the motor cavity on one side of the stator through the exhaust groove, cooling the stator coils on that side. It then passes through the gap between the stator and the spindle to the motor cavity on the other side of the stator, cooling the stator coils on that side. Finally, it is discharged outwards through the cooling gas outlet to the interstage connecting pipe. This invention uses air cooling instead of the previous water cooling method. It not only directly cools the steel plates of the stator and the coils on both sides, providing excellent cooling effect, but also promptly carries away and dissipates heat from inside the motor cavity, preventing heat accumulation inside the motor cavity, protecting the motor, and extending its service life.

[0023] By providing a boss on the side wall of the bearing housing near the motor cavity, and providing several heat dissipation channels along the circumference of the boss to connect the inner hole of the bearing housing with the motor cavity, the cooling gas in the motor cavity can also enter the inner hole of the bearing housing through the heat dissipation channels to cool the radial air bearing. This results in good cooling effect, fast heat dissipation, low failure rate, and extended service life of the radial air bearing. Attached image description:

[0024] Figure 1 This is a cross-sectional structural diagram of the present invention.

[0025] Figure 2 This is a schematic diagram of the interstage cooling system of the present invention.

[0026] Figure 3 This is a three-dimensional structural diagram of the motor housing of the present invention.

[0027] Figure 4 This is a cross-sectional view of the motor housing of the present invention.

[0028] Figure 5 This is a three-dimensional structural diagram of the bearing housing portion of the present invention.

[0029] Figure 6 This is a cross-sectional structural diagram of the bearing seat boss position of the present invention.

[0030] In the diagram, 1. Motor, 2. First-stage compressor pump head, 3. Second-stage compressor pump head, 4. First-stage air inlet, 5. First-stage air outlet, 6. Second-stage air inlet, 7. Second-stage air outlet, 8. Housing, 9. Stator, 10. Main shaft, 11. Bearing housing, 12. Radial air bearing, 13. Interstage connecting pipe, 14. Interstage cooling pipe, 15. Condenser, 16. First expansion valve, 17. Evaporator, 18. Second expansion valve, 19. Steel plate groove, 20. Air guide groove, 21. Cooling gas inlet, 22. Exhaust groove, 23. Cooling gas outlet, 24. Boss, 25. Heat dissipation channel. Detailed implementation method:

[0031] To clearly illustrate the technical features of this solution, the invention will be described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0032] like Figure 1-6 As shown, a fully cooled gas compressor system includes a motor 1. The motor 1 is connected to a primary compressor head 2 and a secondary compressor head 3 at its ends. The primary outlet 5 of the primary compressor head 2 and the secondary inlet 6 of the secondary compressor head 3 are connected via an interstage connecting pipe 13. The motor 1 includes a housing 8, within which a stator 9 and a main shaft 10 are housed. The two ends of the main shaft 10 are supported by bearing seats 11, and a radial air bearing 12 is provided between the bearing seats 11 and the main shaft 10.

[0033] The interstage connecting pipe 13 is provided with an interstage cooling pipe 14, which is connected to the interstage cooling system. The interstage cooling system includes a condenser 15 connected to the secondary outlet 7 of the secondary compressor head 3 via a pipe. One branch of the liquid outlet of the condenser 15 is connected to the inlet of the evaporator 17 via a first expansion valve 16. The outlet of the evaporator 17 is connected to the primary inlet 4 of the primary compressor head 2 via a pipe. The other branch of the liquid outlet of the condenser 15 is connected to the inlet of the interstage cooling pipe 14 via a second expansion valve 18. The outlet of the interstage cooling pipe 14 is connected to the primary inlet 4 of the primary compressor head 2 via a pipe.

[0034] The inner surface of the housing 8 is provided with a steel plate groove 19 along the circumference. The steel plate groove 19 is used to install and fix the steel plates of the stator 9. The steel plates are fitted and sealed with the steel plate groove 19. The inner surface of the steel plate groove 19 is provided with a continuously arranged air guide groove 20. The air guide groove 20 is spaced apart from the front end. The housing 8 is provided with a cooling gas inlet 21 corresponding to the front end of the air guide groove 20. The inner surface of the housing 8 is provided with an exhaust groove 22 corresponding to the rear end of the air guide groove 20 to discharge gas to one side of the stator 9. The housing 8 of the other stage of the stator 9 is provided with a cooling gas outlet 23. The cooling gas inlet 21 and the cooling gas outlet 23 are respectively connected to the interstage connecting pipe 13 through pipelines.

[0035] The bearing housing 11 has a boss 24 on the side wall near the motor cavity. Several heat dissipation channels 25 are arranged along the circumference inside the boss 24 to connect the inner hole of the bearing housing 11 with the motor cavity. The cooling gas in the motor cavity enters the inner hole of the bearing housing 11 through the heat dissipation channels 25 to cool the radial air bearing 12.

[0036] The condenser 15 is used to cool the high-temperature gas discharged from the secondary outlet 7 and turn the gas into a liquid.

[0037] The first expansion valve 16 and the second expansion valve 18 are used to atomize the liquid discharged from the condenser 15 by adjusting the size of their openings.

[0038] The evaporator 17 is used to vaporize the mist discharged from the first expansion valve 16 and cool the surrounding air to blow out cold air, thereby achieving the air conditioning cooling effect.

[0039] The interstage cooling pipe 14 exchanges heat within the interstage connecting pipe 13. The mist discharged from the second expansion valve 18 within the interstage cooling pipe 14 is vaporized, and the surrounding air is cooled, thus cooling the gas within the interstage connecting pipe 13.

[0040] The interstage cooling pipe 14 is arranged in a U-shape, coil shape, or labyrinth shape inside the interstage connecting pipe 13 to improve the heat exchange effect and make the heat exchange more complete.

[0041] The edges of the steel sheet and the steel sheet groove 19 are sealed with sealant to prevent cooling gas from being directly discharged from the edge of the steel sheet groove 19, ensuring that the cooling gas travels along the air guide groove 20 and improving the cooling effect.

[0042] The shape of the air guide groove 20 includes commonly used shapes in fields such as continuously arranged S-shape, W-shape or spiral shape, which can extend the travel distance of the cooling gas and improve the cooling effect.

[0043] Working principle:

[0044] During operation, motor 1 simultaneously drives the primary compressor head 2 and the secondary compressor head 3. The high-pressure gas discharged from the secondary outlet 7 of the secondary compressor head 3 has a temperature of approximately 42°C. This gas enters the condenser 15, where it cools the high-temperature gas, turning it into a liquid. The liquid discharged from the liquid outlet of the condenser 15 has a temperature of approximately 30°C. Part of this liquid is atomized by the first expansion valve 16 and enters the evaporator 17. The evaporator 17 vaporizes the atomized gas, cooling the surrounding air and blowing out cold air, thus achieving the air conditioning cooling effect. The gas discharged from the evaporator 17 has a temperature of approximately 35°C and then enters the primary inlet 4 of the primary compressor head 2. The other part of the liquid discharged from the liquid outlet of the condenser 15 is atomized by the second expansion valve 18 and enters the interstage cooling pipe. 14. Heat exchange occurs between the gas in the interstage connecting pipe 13 and the surrounding air, which cools the gas in the interstage connecting pipe 13. This lowers the temperature of the gas entering the secondary intake port 6 to approximately 37°C, and the temperature of the gas exiting the interstage cooling pipe 14 to approximately 35°C. This gas then enters the primary intake port 4 of the primary compressor head 2. After primary pressurization in the primary compressor head 2, the gas temperature rises to approximately 40°C. It is then discharged from the primary outlet port 5 to the interstage connecting pipe 13. After being cooled by the interstage cooling pipe 14 to approximately 37°C, the gas enters the secondary intake port 6. After secondary pressurization in the secondary compressor head 3, the high-pressure gas exiting from the secondary outlet port 7 has a temperature of approximately 42°C, thus forming a closed-loop cycle of the two-stage gas compressor interstage cooling system.

[0045] The cooling gas in the interstage connecting pipe 13 can also enter the air guide groove 20 through the cooling gas inlet 21. Since the steel sheet and the steel sheet groove 19 are fitted and sealed together, and the edges of the steel sheet and the steel sheet groove 19 are sealed with sealant, the air guide groove 20 can form an independent air guide channel. The cooling gas travels along the air guide groove 20 to directly cool the steel sheet of the stator 9. The cooling gas in the air guide groove 20 is discharged to the motor cavity on one side of the stator 9 through the exhaust groove 22 to cool the stator coil on that side. Then it is discharged to the motor cavity on the other side of the stator 9 through the gap between the stator 9 and the spindle 10 to cool the stator coil on the other side. At the same time, the cooling gas in the motor cavity can enter the inner hole of the bearing housing 11 through several heat dissipation channels 25 to cool the radial air bearing 12 and carry away the heat generated by the radial air bearing 12 during operation. Finally, it is discharged to the interstage connecting pipe 13 through the cooling gas outlet 23. This not only allows for direct cooling of the steel sheets and coils on both sides of the stator 9, resulting in good cooling, but also allows for timely removal of heat from the radial air bearing 12 and the motor cavity, preventing heat accumulation in the motor cavity, protecting the motor 1, and extending the service life of the radial air bearing 12 and the motor 1.

[0046] The above specific embodiments should not be construed as limiting the scope of protection of the present invention. For those skilled in the art, any alternative improvements or modifications made to the embodiments of the present invention shall fall within the scope of protection of the present invention.

[0047] Any aspects of this invention not described in detail are well-known to those skilled in the art.

Claims

1. A fully cooling system for a gas compressor, comprising a motor, with a primary compression pump head and a secondary compression pump head connected to the motor end, the primary outlet of the primary compression pump head and the secondary inlet of the secondary compression pump head connected by an interstage connecting pipe, the motor comprising a housing, a stator and a main shaft disposed within the housing, the two ends of the main shaft being supported by bearing seats, and a radial air bearing disposed between the bearing seats and the main shaft, characterized in that: The interstage connecting pipe is equipped with an interstage cooling pipe, which is connected to the interstage cooling system. The interstage cooling system includes a condenser connected to the secondary outlet of the secondary compression pump head via a pipeline. One branch of the condenser's liquid outlet is connected to the inlet of the evaporator via a first expansion valve. The evaporator's gas outlet is connected to the primary inlet of the primary compression pump head via a pipeline. The other branch of the condenser's liquid outlet is connected to the inlet of the interstage cooling pipe via a second expansion valve. The gas outlet of the interstage cooling pipe is connected to the primary inlet of the primary compression pump head via a pipeline. The inner surface of the housing is provided with a steel plate groove along the circumference. The steel plate groove is used to install and fix the steel plates of the stator. The steel plates are fitted and sealed with the steel plate groove. The inner surface of the steel plate groove is provided with a continuous air guide groove. The air guide groove is spaced apart from the front end. A cooling gas inlet is provided on the housing corresponding to the front end of the air guide groove. An exhaust groove is provided on the inner surface of the housing corresponding to the rear end of the air guide groove to discharge gas to one side of the stator. A cooling gas outlet is provided on the housing of the other stage of the stator. The cooling gas inlet and the cooling gas outlet are respectively connected to the interstage connecting pipe through pipelines. The bearing housing has a boss on the side wall near the motor cavity. Several heat dissipation channels are arranged along the circumference inside the boss to connect the inner hole of the bearing housing with the motor cavity. The cooling gas in the motor cavity enters the inner hole of the bearing housing through the heat dissipation channels to cool the radial air bearing.

2. A system for adequate cooling of a gas compressor according to claim 1, characterized in that: The condenser is used to cool the high-temperature gas discharged from the secondary outlet and turn the gas into a liquid.

3. A substantially cooling system for a gas compressor as claimed in claim 2, wherein: The first expansion valve and the second expansion valve are used to atomize the liquid discharged from the condenser.

4. A fully cooling system for a gas compressor according to claim 3, characterized in that: The evaporator is used to vaporize the mist discharged from the first expansion valve and cool the surrounding air to blow out cold air.

5. A fully cooling system for a gas compressor according to claim 3, characterized in that: The interstage cooling pipe exchanges heat within the interstage connecting pipe. The mist discharged from the second expansion valve within the interstage cooling pipe is vaporized, and the surrounding air is cooled, thus reducing the temperature of the gas within the interstage connecting pipe.

6. A fully cooling system for a gas compressor according to claim 1, characterized in that: The interstage cooling pipes are arranged in a U-shape, coil shape, or labyrinth shape inside the interstage connecting pipes.

7. A fully cooling system for a gas compressor according to claim 1, characterized in that: The edges of the steel sheet and the steel sheet groove are sealed with sealant.

8. A fully cooling system for a gas compressor according to claim 1, characterized in that: The shape of the air guide groove includes continuously arranged S-shape, W-shape or spiral shape.

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