Centrifugal compressor with volute heat dissipation structure

Abstract

The invention relates to a centrifugal compressor with a volute heat dissipation structure, which relates to the technical field of motors, and comprises a motor system, an automatic balance system, a first compression system and a second compression system, the motor system comprises a stator, a rotor device, a casing, two motor end covers, two bearings, two copper sleeves, two end cover inner covers and two end cover outer covers, the stator is mounted in the casing, the rotor device is mounted on the corresponding motor end covers through the bearings, the copper sleeves are sleeved on the corresponding bearings, the motor end covers are provided with oil supply channels, and the oil supply channels are communicated with the casing. The oil supply channel is communicated to an opening in the copper sleeve and an opening in an outer ring of the bearing, the copper sleeve is in clearance fit with the motor end covers, the end cover inner covers and the end cover outer covers are installed on the two sides of the corresponding motor end covers, the automatic balance system comprises a plurality of eccentric rings and a plurality of reference columns, the reference columns are installed in the machine shell, and the eccentric rings are connected with the reference columns. And each eccentric ring is sleeved outside the rotor device, so that the equipment impact is small, and the service life of the equipment is long.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and particularly to a centrifugal compressor with a volute heat dissipation structure. Background Art

[0002] A centrifugal compressor is a device that converts mechanical energy into gas pressure energy and belongs to a type of turbocompressor. Its working principle is to do work on the gas through a high-speed rotating impeller, compress the gas using centrifugal force, and increase its pressure and kinetic energy. Subsequently, in the diffuser flow channel, this part of the kinetic energy is converted into static pressure energy to further promote the increase of gas pressure. Due to their high efficiency, reliability, and large flow rate, centrifugal compressors play an important role in modern industry. They are widely used in various technological processes to transport air, various process gases, or mixed gases and increase their pressure. In addition, centrifugal compressors are often used in fully low-pressure air separation units and are gradually replacing piston compressors.

[0003] Existing centrifugal compressors still vibrate due to dynamic balance problems during operation because of the need for high-speed rotating rotors and impellers, reducing the equipment life. Summary of the Invention

[0004] To overcome the technical defects existing in the prior art, the present invention provides a centrifugal compressor with a volute heat dissipation structure, which has small equipment impact and high equipment life.

[0005] The technical solution adopted by the present invention is: A centrifugal compressor with a volute heat dissipation structure comprises a motor system, an automatic balancing system, a first compression system and a second compression system, wherein the motor system has two output ends, the first compression system and the second compression system are installed on both sides of the motor system and the first compression system and the second compression system are respectively connected to the corresponding output ends in a transmission manner, the motor system comprises a stator, a rotor device, a casing, two motor end covers, two bearings, two copper sleeves, two end cover inner covers and two end cover outer covers, the rotor device forms two output ends, the stator is installed in the casing, the rotor device is installed on the corresponding motor end cover through each bearing, each copper sleeve is arranged on the corresponding bearing, the copper sleeve and the outer ring of the bearing are both provided with openings, the motor end cover is provided with an oil supply channel, the oil supply channel is connected to the opening on the copper sleeve and The opening on the outer ring of the bearing, the copper sleeve and the motor end cover are gap-matched, each end cover inner cover is installed on the side of the corresponding motor end cover close to the stator, and each end cover outer cover is installed on the side of the corresponding motor end cover away from the stator. The end cover inner cover and the end cover outer cover are both connected to the rotor device through a sealing sleeve. The automatic balancing system includes a plurality of eccentric rings and a plurality of reference columns, each of which is evenly installed in the casing along the inner side of the casing, and each of the eccentric rings is sleeved and installed outside the rotor device. The diameter of the cylindrical surface where the vertex of each reference column is located is defined as a first diameter, and the outer diameter of the eccentric ring is defined as a second diameter. The difference between the first diameter and the second diameter is equal to twice the gap between the copper sleeve and the motor end cover, and the distance between the center of the eccentric ring and the axis of rotation of the rotor device is smaller than the gap between the copper sleeve and the motor end cover.

[0006] Preferably, the first compression system includes a No. 1 volute end cover, a first volute, a first collector and a first impeller, the No. 1 volute end cover is mounted on the motor end cover, the first volute is mounted on the No. 1 volute end cover, the first collector is mounted on the side of the No. 1 volute end cover away from the motor end cover, the first collector is connected to the first volute, the first impeller is mounted on the rotor device, the first impeller is located in the first collector, and the No. 1 volute end cover and the rotor device are sealed by a stepped sealing sleeve.

[0007] Preferably, the second compression system includes a No. 2 volute end cover, a second volute, a second collector and a second impeller, the No. 2 volute end cover is mounted on the motor end cover, the second volute is mounted on the No. 2 volute end cover, the second collector is mounted on the side of the No. 2 volute end cover away from the motor end cover, the second volute is connected to the second collector, the second impeller is mounted on the rotor device, the second impeller is located in the second collector, and the No. 2 volute end cover and the rotor device are sealed by a stepped sealing sleeve.

[0008] Preferably, the rotor device comprises two output shafts and an intermediate sleeve, the two output shafts are mounted on both sides of the intermediate sleeve, and each eccentric ring sleeve is arranged outside the intermediate sleeve.

[0009] Preferably, a flared pipe joint and an extended joint are provided at the end of the oil supply channel of the motor end cover in sequence.

[0010] Preferably, the gap between the copper sleeve and the motor end cover is 0.2 mm to 0.4 mm.

[0011] Preferably, a plurality of pressure-maintaining grooves are provided on one side of the copper sleeve close to the motor end cover.

[0012] Preferably, the eccentric ring and the plurality of reference columns are all in arc shape at positions close to each other.

[0013] The beneficial effects of the present invention are: The motor system has two output ends, a first compression system and a second compression system are installed on both sides of the motor system, and the first compression system and the second compression system are respectively connected to the corresponding output ends in a transmission manner, and the motor system is used to drive the first compression system and the second compression system to compress gas. The motor system includes a stator, a rotor device, a casing, two motor end covers, two bearings, two copper sleeves, two end cover inner covers and two end cover outer covers, and the rotor device forms two output ends. The stator is installed in the casing, and the rotor device is installed on the corresponding motor end cover through each bearing. Each copper sleeve is sleeved on the corresponding bearing. The outer ring of the copper sleeve and the bearing are both provided with openings, and an oil supply channel is provided on the motor end cover. The oil supply channel is connected to the opening on the copper sleeve and the opening on the outer ring of the bearing. The copper sleeve and the motor end cover are gap-matched, and the pressurized lubricating oil injected from the oil supply channel enters the gap between the copper sleeve and the motor end cover, so that when the rotor device rotates, after the rotor device vibrates due to a dynamic balance problem, the vibration of the rotor device is buffered because the gap between the copper sleeve and the motor end cover is filled with pressurized oil, and a heat dissipation effect is generated, thereby increasing the life of the equipment.

[0014] The inner cover of each end cover is installed on the side close to the stator of the corresponding motor end cover, and the outer cover of each end cover is installed on the side far from the stator of the corresponding motor end cover. The inner cover of the end cover and the outer cover of the end cover are both connected to the rotor device through a sealing sleeve, thereby preventing the leakage of lubricating oil. The automatic balancing system includes a plurality of eccentric rings and a plurality of reference columns. Each reference column is uniformly installed in the machine shell along the inner side of the machine shell. Each eccentric ring is sleeved and installed outside the rotor device. The diameter of the cylindrical surface where the vertices of each reference column are located is defined as the first diameter, and the outer diameter of the eccentric ring is defined as the second diameter. The difference between the first diameter and the second diameter is equal to twice the gap between the copper sleeve and the motor end cover. The distance between the center of the eccentric ring and the rotation axis of the rotor device is less than the gap between the copper sleeve and the motor end cover. After the rotation axis of the rotor device is slightly offset due to vibration of the rotor device, the reference column rubs against the offset eccentric ring, causing the eccentric ring to rotate. Since the eccentric ring rotates relative to the rotor device, the rotor device automatically adjusts its dynamic balance, resulting in low equipment impact and high equipment lifespan. Brief Description of the Drawings

[0015] Figure 1 It is a schematic structural diagram of the present invention.

[0016] Figure 2 It is Figure 1 the enlarged schematic diagram at position A in

[0017] Figure 3 It is Figure 1 the enlarged schematic diagram at position B in

[0018] Figure 4 It is the sectional view schematic diagram of the automatic balancing system.

[0019] Description of the Reference Numerals: 1. Motor system; 11. Stator; 12. Rotor device; 121. Output shaft; 122. Intermediate sleeve; 13. Machine shell; 14. Motor end cover; 141. Oil supply channel; 15. Bearing; 16. Copper sleeve; 161. Pressure holding groove; 17. Inner cover of the end cover; 18. Outer cover of the end cover; 2. Automatic balancing system; 21. Eccentric ring; 22. Reference column; 3. First compression system; 31. First volute end cover; 32. First volute; 33. First collector; 34. First impeller; 4. Second compression system; 41. Second volute end cover; 42. Second volute; 43. Second collector; 44. Second impeller. Detailed Embodiment

[0020] The present invention will be further described below with reference to the drawings: As Figure 1 — Figure 4As shown, this embodiment provides a centrifugal compressor with a volute heat dissipation structure, including a motor system 1, an automatic balancing system 2, a first compression system 3 and a second compression system 4, the motor system 1 has two output ends, the first compression system 3 and the second compression system 4 are installed on both sides of the motor system 1, and the first compression system 3 and the second compression system 4 are respectively connected to the corresponding output ends in a transmission manner, the motor system 1 is used to drive the first compression system 3 and the second compression system 4 to compress gas, the motor system 1 includes a stator 11, a rotor device 12, a casing 13, two motor end covers 14, two bearings 15, two copper sleeves 16, two end cover inner covers 17 and two end cover outer covers 18, the rotor device 12 forms two output ends, the stator 11 is installed in the casing 13, The rotor device 12 is installed on the corresponding motor end cover 14 through each bearing 15, and each copper sleeve 16 is sleeved on the corresponding bearing 15. The outer rings of the copper sleeve 16 and the bearing 15 are both provided with openings. The motor end cover 14 is provided with an oil supply channel 141, and the oil supply channel 141 is connected to the openings on the copper sleeve 16 and the openings on the outer ring of the bearing 15. The copper sleeve 16 and the motor end cover 14 are clearance-matched, and the pressurized lubricating oil injected from the oil supply channel 141 enters the gap between the copper sleeve 16 and the motor end cover 14, so that when the rotor device 12 rotates, after the rotor device 12 vibrates due to a dynamic balance problem, the vibration of the rotor device 12 is buffered because the gap between the copper sleeve 16 and the motor end cover 14 is filled with pressurized oil, and a heat dissipation effect is produced, thereby increasing the life of the equipment.

[0021] Each end cover inner cover 17 is installed on the side of the corresponding motor end cover 14 close to the stator 11, and each end cover outer cover 18 is installed on the side of the corresponding motor end cover 14 away from the stator 11. The end cover inner cover 17 and the end cover outer cover 18 are connected to the rotor device 12 through a sealing sleeve to prevent lubricating oil leakage. The automatic balancing system 2 includes a plurality of eccentric rings 21 and a plurality of reference columns 22. Each reference column 22 is evenly installed in the housing 13 along the inner side of the housing 13. Each eccentric ring 21 is sleeved and installed outside the rotor device 12. The diameter of the cylindrical surface where the vertex of each reference column 22 is located is defined as the first diameter. The diameter of the eccentric ring 21 The outer diameter is defined as the second diameter, and the difference between the first diameter and the second diameter is equal to twice the gap between the copper sleeve 16 and the motor end cover 14. The distance between the center of the eccentric ring 21 and the rotation axis of the rotor device 12 is smaller than the gap between the copper sleeve 16 and the motor end cover 14. When the rotor device 12 vibrates, causing the rotation axis of the rotor device 12 to shift slightly, the reference column 22 rubs against the shifted eccentric ring 21, causing the eccentric ring 21 to rotate. Since the eccentric ring 21 rotates relative to the rotor device 12, the rotor device 12 automatically adjusts the dynamic balance, the equipment has little impact, and the equipment life is long.

[0022] Please note that since the difference between the first diameter and the second diameter is equal to twice the clearance between the copper sleeve 16 and the motor end cover 14, when the rotor device 12 rotates smoothly, the eccentric ring 21 should not touch the reference post 22. However, when the rotor device 12 vibrates severely, the eccentric ring 21 will touch the reference post 22. It is worth noting that the side that touches the reference post 22 must be the heavier side of the rotor device 12. After the protruding eccentric ring 21 touches the reference post 22, the eccentric ring 21 will rotate, enabling the eccentric ring 21 to pass through the position of the reference post 22 without being blocked. As a result, the weight on the heavier side of the rotor device 12 is reduced, achieving automatic adjustment of the dynamic balance of the rotor device 12 and ensuring smooth rotation of the rotor device 12.

[0023] Specifically, the first compression system 3 includes a first volute end cover 31, a first volute 32, a first collector 33, and a first impeller 34. The first volute end cover 31 is installed on the motor end cover 14, the first volute 32 is installed on the first volute end cover 31, the first collector 33 is installed on the side of the first volute end cover 31 away from the motor end cover 14. The first collector 33 is in communication with the first volute 32. The first impeller 34 is installed on the rotor device 12, and the first impeller 34 is located within the first collector 33. The space between the first volute end cover 31 and the rotor device 12 is sealed by a stepped seal sleeve. The rotation of the first impeller 34 achieves primary pressurization.

[0024] Specifically, the second compression system 4 includes a second volute end cover 41, a second volute 42, a second collector 43, and a second impeller 44. The second volute end cover 41 is installed on the motor end cover 14, the second volute 42 is installed on the second volute end cover 41, the second collector 43 is installed on the side of the second volute end cover 41 away from the motor end cover 14. The second volute 42 is in communication with the second collector 43. The air after primary pressurization flows into the second collector 43. The second impeller 44 is installed on the rotor device 12, and the second impeller 44 is located within the second collector 43. The space between the second volute end cover 41 and the rotor device 12 is sealed by a stepped seal sleeve. The rotation of the second impeller 44 achieves secondary pressurization.

[0025] Specifically, the rotor device 12 includes two output shafts 121 and an intermediate sleeve 122. The two output shafts 121 are installed on both sides of the intermediate sleeve 122, thereby ensuring synchronous rotation of the two output shafts 121. Each eccentric ring 21 is sleeved outside the intermediate sleeve 122.

[0026] Specifically, at the end of the oil supply channel 141 of the motor end cover 14, a flared pipe joint and an extended joint are successively provided for oil inlet.

[0027] Specifically, the gap between the copper bushing 16 and the motor end cover 14 is 0.2 mm to 0.4 mm, thereby forming a buffer gap to prevent rigid collision and improve the service life.

[0028] Specifically, a number of pressure-holding grooves 161 are provided on the side of the copper bushing 16 close to the motor end cover 14. When the copper bushing 16 vibrates, the pressure-holding grooves 161 block the outflow of the pressure oil, reduce the flow rate of the pressure oil, and ensure sufficient oil pressure of the pressure oil between the copper bushing 16 and the motor end cover 14.

[0029] Specifically, the mutually approaching positions of the eccentric ring 21 and a number of reference posts 22 are circular arcs, reducing the impact force of collision and increasing the service life.

[0030] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A centrifugal compressor with a volute heat dissipation structure, characterized in that, The invention comprises a motor system, an automatic balancing system, a first compression system and a second compression system, wherein the motor system has two output ends, the first compression system and the second compression system are installed on both sides of the motor system and the first compression system and the second compression system are respectively connected to the corresponding output ends by transmission, the motor system comprises a stator, a rotor device, a casing, two motor end covers, two bearings, two copper sleeves, two end cover inner covers and two end cover outer covers, the rotor device forms two output ends, the stator is installed in the casing, the rotor device is installed on the corresponding motor end cover through each bearing, each copper sleeve is arranged on the corresponding bearing, the copper sleeve and the outer ring of the bearing are both provided with openings, the motor end cover is provided with an oil supply channel, the oil supply channel is connected to the opening on the copper sleeve and the opening on the outer ring of the bearing , the copper sleeve is matched with the motor end cover gap, each end cover inner cover is installed on the side of the corresponding motor end cover close to the stator, and each end cover outer cover is installed on the side of the corresponding motor end cover away from the stator, and the end cover inner cover and the end cover outer cover are connected to the rotor device through a sealing sleeve. The automatic balancing system includes a plurality of eccentric rings and a plurality of reference columns, each of which is evenly installed in the casing along the inner side of the casing, and each of the eccentric rings is sleeved and installed outside the rotor device. The diameter of the cylindrical surface where the vertex of each reference column is located is defined as a first diameter, and the outer diameter of the eccentric ring is defined as a second diameter. The difference between the first diameter and the second diameter is equal to twice the gap between the copper sleeve and the motor end cover, and the distance between the center of the eccentric ring and the axis of rotation of the rotor device is smaller than the gap between the copper sleeve and the motor end cover.

2. The centrifugal compressor with a volute heat dissipation structure according to claim 1, characterized in that, The first compression system includes a No. 1 volute end cover, a first volute, a first collector and a first impeller. The No. 1 volute end cover is installed on the motor end cover, the first volute is installed on the No. 1 volute end cover, the first collector is installed on the side of the No. 1 volute end cover away from the motor end cover, the first collector is connected to the first volute, the first impeller is installed on the rotor device, the first impeller is located in the first collector, and the No. 1 volute end cover and the rotor device are sealed by a stepped sealing sleeve.

3. The centrifugal compressor with a volute heat dissipation structure according to claim 1, characterized in that, The second compression system includes a No. 2 volute end cover, a second volute, a second collector and a second impeller. The No. 2 volute end cover is installed on the motor end cover, the second volute is installed on the No. 2 volute end cover, the second collector is installed on the side of the No. 2 volute end cover away from the motor end cover, the second volute is connected to the second collector, the second impeller is installed on the rotor device, the second impeller is located in the second collector, and the No. 2 volute end cover and the rotor device are sealed by a stepped sealing sleeve.

4. The centrifugal compressor with a volute heat dissipation structure according to claim 1, wherein The rotor device comprises two output shafts and an intermediate sleeve. The two output shafts are mounted on both sides of the intermediate sleeve, and each eccentric ring sleeve is arranged outside the intermediate sleeve.

5. The centrifugal compressor with a volute heat dissipation structure according to claim 1, characterized in that, The end of the oil supply channel of the motor end cover is provided with a flared pipe joint and an extended joint in sequence.

6. The centrifugal compressor with a volute heat dissipation structure according to claim 1, characterized in that, The gap between the copper sleeve and the motor end cover is 0.2 mm to 0.4 mm.

7. The centrifugal compressor with a volute heat dissipation structure according to claim 1, characterized in that, A plurality of pressure retaining grooves are arranged on one side of the copper sleeve close to the motor end cover.

8. The centrifugal compressor with a volute heat dissipation structure according to claim 1, characterized in that, The mutually adjacent positions of the eccentric ring and the plurality of reference columns are all arc-shaped.

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