A high-speed centrifugal air compressor

Abstract

The present invention relates to a high-speed centrifugal air compressor, which relates to the field of motor cooling technology. The compressor comprises a casing, a power system, two shock-absorbing bearing systems and two compression systems. The power system is installed in the casing through the two shock-absorbing bearing systems. The power system has two output ends. The compression system comprises two impellers and two volutes. The two volutes are sequentially provided with an air inlet, a pressurizing chamber and a spiral output pipe. The spiral output pipe of one volute is connected to the air inlet of the other volute after passing through an air cooler. Each impeller is installed at the output end corresponding to the power system. Each impeller is rotatably installed in the pressurizing chamber. A plurality of water injection ports are provided on the inner side of the air inlet of each volute. The air compression efficiency is high and the burden on the motor is small.

Description

Technical Field

[0001] The present invention relates to the technical field of motor cooling, in particular to a high-speed centrifugal air compressor. Background Art

[0002] A centrifugal air compressor uses a high-speed rotating impeller to generate work on gas, increasing its pressure through centrifugal force. The impeller spins the gas at high speed within a volute, generating centrifugal force that increases the flow rate and pressure behind the impeller, producing compressed air continuously. Cooling the motor and other components has always been a challenge.

[0003] A centrifugal air compressor consists primarily of two parts: a rotor and a stator. The rotor includes an impeller with blades and a shaft. The stator comprises the main body of the casing (cylinder), along with a diffuser, a bend, a return flow device, an inlet pipe, an exhaust pipe, and some shaft seals. When the impeller spins at high speed, the gas is drawn into the diffuser behind it by centrifugal force, creating a vacuum zone that allows fresh air to enter the impeller. As the impeller rotates continuously, gas is constantly drawn in and out, maintaining a continuous flow.

[0004] Moreover, when the impeller rotates, the gap between the impeller and the volute will cause air pressure loss, which will require the motor speed to be further increased, making heat dissipation even more unfavorable. Summary of the Invention

[0005] In order to overcome the technical defects of the prior art, the present invention provides a high-speed centrifugal air compressor with high air compression efficiency and low motor burden.

[0006] The technical solution adopted by the present invention is:

[0007] A high-speed centrifugal air compressor includes a casing, a power system, two shock-absorbing bearing systems and two compression systems. The power system is installed in the casing through the two shock-absorbing bearing systems. The power system has two output ends. The compression system includes two impellers and two volutes. The two volutes are respectively provided with an air inlet, a pressurizing chamber and a spiral output pipe. The spiral output pipe of one volute is connected to the air inlet of the other volute after passing through an air cooler. Each impeller is installed at the corresponding output end of the power system. Each impeller is rotatably installed in the pressurizing chamber. The inner side of the air inlet of each volute is provided with a plurality of water injection ports.

[0008] Preferably, the power system includes a stator, an intermediate section and two rotor shafts, the two rotor shafts are rotatably mounted on the casing through corresponding shock-absorbing bearing systems, the stator is mounted on the casing, the two rotor shafts are mounted through the intermediate section, and the two rotor shafts respectively constitute output ends.

[0009] Preferably, each of the shock-absorbing bearing systems includes a mounting end cover, an oil injection device, a sealing device and a bearing device. The mounting end cover is mounted on the side of the casing, and the output end passes through the bearing device. The sealing device is mounted on the mounting end cover. The sealing device is in sealing contact with the output ends on both sides of the bearing device. The mounting end cover has an oil nozzle near the bearing device. The mounting end cover is pressed on the shock-absorbing bearing system. The mounting end cover supports the shock-absorbing bearing system. The oil injection device is connected to the oil nozzle. An oil injection channel connected to the oil nozzle is opened on the mounting end cover. The oil injection device points to the bearing device.

[0010] Preferably, the oil injection device is a threaded needle pointing to the bearing device, and the threaded needle is connected to the oil injection channel.

[0011] Preferably, the bearing device includes a bearing frame and a load-bearing bearing, the inner ring of the load-bearing bearing is installed on the output end, the outer ring of the load-bearing bearing is installed in the mounting end cover through the bearing frame, and the oil injection channel is connected between the bearing frame and the mounting end cover.

[0012] Preferably, the sealing device includes an end cover inner cover, an inner oil seal, an oil seal outer cover and an end cover outer cover, the oil seal outer cover and the inner oil seal are both sleeved on the output end, the oil seal outer cover and the inner oil seal are respectively located on the output ends on both sides of the bearing device, the end cover outer cover and the end cover inner cover are respectively installed on both sides of the mounting end cover, the end cover inner cover and the inner oil seal are slidingly sealed, and the oil seal outer cover and the end cover outer cover are slidingly sealed.

[0013] Preferably, each of the volutes is mounted on a side of the shock-absorbing bearing system through a volute end cover.

[0014] Preferably, a stepped sealing sleeve and a stepped sealing cover are also installed on the output end. The stepped sealing sleeve is arranged on the output end, the stepped sealing sleeve is located between the impeller and the shock-absorbing bearing system, the oil seal outer cover is installed on the volute end cover, and the stepped sealing sleeve and the stepped sealing cover are slidingly sealed.

[0015] The beneficial effects of the present invention are:

[0016] The power system is installed in the casing through two shock-absorbing bearing systems to generate power. The power system has two output ends. The compression system includes two impellers and two volutes. The two volutes are respectively provided with an air inlet, a pressurized chamber and a spiral output pipe. The spiral output pipe of one volute is connected to the air inlet of the other volute after passing through the air cooler. The air cooler cools the hot air in one of the spiral output pipes and then sends it to the other air inlet for re-pressurization. Each impeller is installed at the corresponding output end of the power system, thereby driving the impeller to rotate. Each impeller is rotatably installed in the pressurized chamber. A number of water injection ports are provided on the inside of the air inlet of each volute to form a water film between the pressurized chamber and the impeller to strengthen the pressurized chamber. The seal between the impeller and the pressurized chamber improves the compression efficiency. On the other hand, the water film is located between the pressurized chamber and the impeller. When the impeller rotates at high speed, the water film not only takes away the heat of the impeller, but also because the water film plays a supporting role between the pressurized chamber and the impeller, it is beneficial to eliminate the rotation imbalance of the impeller. Moreover, due to the large specific heat capacity of water, when the impeller pressurizes the air, the water reduces the air temperature, causing the air temperature to drop, playing the role of cooling the air in advance and increasing the compression rate of the air. Since the two compression systems above are connected in series, in order to dehydrate the compressed air, the water injection port only injects water at the position of the compression system in the front channel. After passing through the air cooler described above, the water contained in the air and the water input from the water injection port are condensed and discharged. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention.

[0018] Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention.

[0019] Figure 3 for Figure 2 Enlarged schematic diagram of point A in the middle.

[0020] Figure 4 for Figure 2 Enlarged schematic diagram of point B in the middle.

[0021] Description of reference numerals:

[0022] 1. Casing;

[0023] 2. Power system; 21. Stator; 22. Intermediate section; 23. Rotor shaft;

[0024] 3. Shock-absorbing bearing system; 31. Oil filling device; 311. Threaded needle; 32. Sealing device; 321. End cap inner cover; 322. Inner oil seal; 323. Oil seal outer cover; 324. End cap outer cover; 325. Oil filling channel; 33. Bearing assembly; 332. Install end cap; 333. Load-bearing bearing; 334. Bearing frame;

[0025] 4. Compression system; 41. Impeller; 42. Volute; 421. Air inlet; 4211. Water injection port; 422. Pressurized chamber; 423. Spiral output pipe; 425. Volute end cover;

[0026] 5. Fuel injection nozzle;

[0027] 61. Step sealing sleeve; 62. Step sealing cover. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings:

[0029] like Figure 1 — Figure 4 As shown, this embodiment provides a high-speed centrifugal air compressor, including a casing 1, a power system 2, two shock-absorbing bearing systems 3 and two compression systems 4. The power system 2 is installed in the casing 1 through the two shock-absorbing bearing systems 3 to generate power. The power system 2 has two output ends. The compression system 4 includes two impellers 41 and two volutes 42. The two volutes 42 are respectively provided with an air inlet 421, a pressurizing chamber 422 and a spiral output pipe 423. The spiral output pipe 423 of one volute 42 is connected to the air inlet 421 of the other volute 42 after passing through an air cooler. The air cooler cools the hot air in one of the spiral output pipes 423 and then sends it to the other air inlet 421 for re-pressurization. Each impeller 41 is installed at the corresponding output end of the power system 2, thereby driving the impeller 41 to rotate. Each impeller 41 is rotatably installed in the pressurizing chamber 422. The inner side of the air inlet 421 of each volute is provided with several The dry water injection port 4211 is used to form a water film between the pressurization chamber 422 and the impeller 41, strengthen the sealing between the pressurization chamber 422 and the impeller 41, improve the compression efficiency, and reduce the burden on the motor. On the other hand, the water film is located between the pressurization chamber 422 and the impeller 41. When the impeller 41 rotates at high speed, the water film not only takes away the heat of the impeller 41, but also because the water film plays a supporting role between the pressurization chamber 422 and the impeller 41, it is beneficial to eliminate the rotation imbalance of the impeller 41. Moreover, due to the large specific heat capacity of water, when the impeller 41 pressurizes the air, the water reduces the air temperature, causing the air temperature to reduce, playing the role of cooling the air in advance, and increasing the compression rate of the air. Since the two compression systems 4 above are connected in series, in order to dehydrate the compressed air, the water injection port 4211 only injects water at the position of the front compression system 4. After passing through the air cooler described above, the water contained in the air and the water input from the water injection port 4211 are condensed and discharged.

[0030] Specifically, the power system 2 includes a stator 21, an intermediate section 22 and two rotor shafts 23. The two rotor shafts 23 are rotatably mounted on the casing 1 through corresponding shock-absorbing bearing systems 3. The stator 21 is mounted on the casing 1, and the two rotor shafts 23 are mounted through the intermediate section 22, thereby achieving synchronous rotation of the two rotor shafts 23. The two rotor shafts 23 respectively constitute output ends.

[0031] Specifically, each shock-absorbing bearing system 3 includes a mounting end cover 332, an oil injection device 31, a sealing device 32 and a bearing device 33. The mounting end cover 332 is mounted on the side of the housing 1, and the output end passes through the bearing device 33. The sealing device 32 is mounted on the mounting end cover 332. The sealing device 32 is in sealing contact with the output ends on both sides of the bearing device 33. The mounting end cover 332 has an oil nozzle 5 near the bearing device 33. The mounting end cover 332 is pressed on the shock-absorbing bearing system 3, and the mounting end cover 332 supports the shock-absorbing bearing system 3. The oil injection device 31 is mounted on the side of the housing 1, and the output end passes through the bearing device 33. The sealing device 32 is mounted on the mounting end cover 332. 1 is connected to the oil nozzle 5. An oil injection channel 325 connected to the oil nozzle 5 is opened on the installation end cover 332. The oil injection device 31 points to the bearing device 33. Lubricating oil is injected from the oil injection channel 325. After the lubricating oil is injected from the oil injection channel 325, it is divided into two paths. One path is injected from the oil nozzle 5 into the gap between the installation end cover 332 and the bearing device 33. The lubricating oil in the gap between the installation end cover 332 and the bearing device 33 provides a buffer space for the rotation vibration of the bearing device 33. The other path is sprayed to the bearing device 33 through the oil injection device 31 for lubrication.

[0032] Specifically, the oil injection device 31 is a threaded needle 311 pointing to the bearing device 33 , and the threaded needle 311 is connected to the oil injection channel 325 to facilitate lubrication and heat dissipation of the bearing device 33 .

[0033] Specifically, the bearing device 33 includes a bearing frame 334 and a load-bearing bearing 333. The inner ring of the load-bearing bearing 333 is installed on the output end, and the outer ring of the load-bearing bearing 333 is installed in the mounting end cover 332 through the bearing frame 334. The oil injection channel 325 is connected to the space between the bearing frame 334 and the mounting end cover 332 through the oil nozzle 5. Lubricating oil is injected from the oil injection channel 325, and the lubricating oil flows into the oil nozzle 5 to spray high-pressure lubricating oil to the bearing frame 334, so that the bearing frame 334 is suspended in the center of the mounting end cover 332. The mounting end cover 332 is installed on the side of the casing 1, thereby realizing the rotational installation of the output end. Since the space between the bearing frame 334 and the mounting end cover 332 is filled with pressurized lubricating oil, the impact caused by the rotation of the intermediate section 22, the two rotor shafts 23 and the impeller 41 is eliminated, deformation is prevented, large vibrations are avoided, and slight vibrations are eliminated in real time.

[0034] Specifically, the sealing device 32 includes an end cap inner cover 321, an inner oil seal 322, an outer oil seal cover 323, and an end cap outer cover 324. The outer oil seal cover 323 and the inner oil seal 322 are both mounted on the output end. The outer oil seal cover 323 and the inner oil seal 322 are respectively located on the output ends on both sides of the bearing device 33. The end cap outer cover 324 and the end cap inner cover 321 are respectively mounted on both sides of the mounting end cap 332. The end cap inner cover 321 and the inner oil seal 322 are in sliding seal with each other, while the oil seal outer cover 323 and the end cap outer cover 324 are in sliding seal with each other to prevent lubricating oil leakage.

[0035] Specifically, each volute 42 is mounted on a side of the mounting end cover 332 of the shock-absorbing bearing system 3 through a volute end cover 425 .

[0036] Specifically, a stepped sealing sleeve 61 and a stepped sealing cover 62 are also installed on the output end. The stepped sealing sleeve 61 is sleeved on the output end, and the stepped sealing sleeve 61 is located between the impeller 41 and the shock-absorbing bearing system 3. The stepped sealing cover 62 is installed on the volute end cover 425. The stepped sealing sleeve 61 and the stepped sealing cover 62 are slidably sealed to further prevent leakage of lubricating oil.

[0037] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which shall fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A high-speed centrifugal air compressor, characterized in that: It includes a casing, a power system, two shock-absorbing bearing systems and two compression systems. The power system is installed in the casing through the two shock-absorbing bearing systems. The power system has two output ends. The compression system includes two impellers and two volutes. The two volutes are respectively provided with an air inlet, a pressurized chamber and a spiral output pipe. The spiral output pipe of one volute is connected to the air inlet of the other volute after passing through an air cooler. Each impeller is installed at the output end corresponding to the power system. Each impeller is rotatably installed in the pressurized chamber. A number of water injection ports are provided on the inner side of the air inlet of each volute. Each shock-absorbing bearing system includes an installation end cover, an oil injection device, a sealing device and a bearing device. The installation end cover is installed on the side of the casing. The output end passes through the shaft The bearing device, the sealing device is installed on the mounting end cover, the sealing device is in sealing contact with the output ends on both sides of the bearing device, the mounting end cover has an oil nozzle near the bearing device, the mounting end cover is pressed on the shock-absorbing bearing system, the mounting end cover supports the shock-absorbing bearing system, the oil injection device is connected to the oil nozzle, and an oil injection channel connected to the oil nozzle is opened on the mounting end cover, the oil injection device points to the bearing device, and the lubricating oil is injected from the oil injection channel. After the lubricating oil is injected from the oil injection channel, it is divided into two paths, one path is injected from the oil nozzle into the gap between the mounting end cover and the bearing device, the lubricating oil in the gap between the mounting end cover and the bearing device provides a buffer space for the rotational vibration of the bearing device, and the other path is sprayed to the bearing device through the oil injection device for lubrication.

2. A high-speed centrifugal air compressor according to claim 1, characterized in that: The power system includes a stator, an intermediate section and two rotor shafts. The two rotor shafts are rotatably mounted on the casing through corresponding shock-absorbing bearing systems. The stator is mounted on the casing, and the two rotor shafts are mounted through the intermediate section. The two rotor shafts respectively constitute output ends.

3. A high-speed centrifugal air compressor according to claim 1, characterized in that: The oil injection device is a threaded needle pointing to the bearing device, and the threaded needle is connected to the oil injection channel.

4. A high-speed centrifugal air compressor according to claim 1, characterized in that: The bearing device includes a bearing frame and a load-bearing bearing, the inner ring of the load-bearing bearing is installed on the output end, the outer ring of the load-bearing bearing is installed in the mounting end cover through the bearing frame, and the oil injection channel is connected to the space between the bearing frame and the mounting end cover through an oil nozzle.

5. A high-speed centrifugal air compressor according to claim 1, characterized in that: The sealing device includes an end cover inner cover, an inner oil seal, an oil seal outer cover and an end cover outer cover. The oil seal outer cover and the inner oil seal are both sleeved on the output end. The oil seal outer cover and the inner oil seal are respectively located on the output ends on both sides of the bearing device. The end cover outer cover and the end cover inner cover are respectively installed on both sides of the mounting end cover. The end cover inner cover and the inner oil seal are slidingly sealed. The oil seal outer cover and the end cover outer cover are slidingly sealed.

6. A high-speed centrifugal air compressor according to claim 5, characterized in that: Each of the volutes is mounted on a side of the shock-absorbing bearing system through a volute end cover.

7. A high-speed centrifugal air compressor according to claim 6, characterized in that: A stepped sealing sleeve and a stepped sealing cover are also installed on the output end. The stepped sealing sleeve is mounted on the output end. The stepped sealing sleeve is located between the impeller and the shock-absorbing bearing system. The oil seal outer cover is installed on the volute end cover. The stepped sealing sleeve and the stepped sealing cover are slidingly sealed.

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