CN113417869A - Air suspension type low-pressure pure oil-free centrifugal compressor - Google Patents
Air suspension type low-pressure pure oil-free centrifugal compressor Download PDFInfo
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- CN113417869A CN113417869A CN202110592745.1A CN202110592745A CN113417869A CN 113417869 A CN113417869 A CN 113417869A CN 202110592745 A CN202110592745 A CN 202110592745A CN 113417869 A CN113417869 A CN 113417869A
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- shell
- volute
- cooling liquid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/08—Centrifugal pumps
- F04D17/10—Centrifugal pumps for compressing or evacuating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/02—Selection of particular materials
- F04D29/023—Selection of particular materials especially adapted for elastic fluid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
- F04D29/056—Bearings
- F04D29/057—Bearings hydrostatic; hydrodynamic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/083—Sealings especially adapted for elastic fluid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/284—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for compressors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/44—Fluid-guiding means, e.g. diffusers
- F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/582—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps
- F04D29/5846—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps cooling by injection
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/666—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by means of rotor construction or layout, e.g. unequal distribution of blades or vanes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence
Abstract
The invention discloses an air suspension type low-pressure pure oil-free centrifugal compressor, which comprises a shell, a rotating shaft and a turbine, wherein the shell is provided with a shell body; an end cover is arranged on the shell, a first cooling liquid inlet pipe and a first cooling liquid outlet pipe are arranged on the end cover, a cooling groove and a stator are arranged in the end cover, radial dynamic pressure bearings are clamped at two ends in the shell, the rotating shaft is movably clamped in the shell, two ends of the rotating shaft are suspended in the two radial dynamic pressure bearings, first dynamic pressure grooves are respectively arranged at positions of the rotating shaft corresponding to the two radial dynamic pressure bearings, and a rotor is sleeved on the rotating shaft; the turbine comprises a volute and an impeller, the volute is movably arranged at the other end of the shell, an air inlet pipe is arranged at the end part of the volute, an air outlet pipe is arranged on the side wall of the volute, a pressure expansion cavity is arranged in an inner cavity of the volute, and the impeller is arranged inside the volute and is movably connected with the end part of the rotating shaft; the invention has reasonable structure and stable and reliable operation, and is suitable for mass popularization.
Description
Technical Field
The invention relates to the technical field of compressors, in particular to an air suspension type low-pressure pure oil-free centrifugal compressor.
Background
A centrifugal compressor is a device that compresses gas by centrifugal force thereof by rotating a blade wheel in a housing. Centrifugal compressors may be configured to compress a gas, such as a refrigerant gas. In such a centrifugal compressor, when the driving force of the motor is transmitted to the impeller and the impeller is rotated, gas is introduced into the impeller by the rotational force of the impeller. As the gas flows due to the impeller, kinetic energy increases, and the gas with increased kinetic energy passes through the diffuser and converts the kinetic energy to static pressure, thereby increasing the pressure. The gas whose pressure is increased in this way passes through the volute and the discharge port, which are sequentially communicated with the volute, and is then discharged to the outside of the centrifugal compressor. The diffuser converts the kinetic energy of the gas into static pressure. An example of a diffuser may be a vaneless diffuser in which the cross-sectional area of the channel through which the gas passes gradually decreases in the direction of gas flow. Another example of the diffuser may be a vane diffuser in which a cross-sectional area of a passage through which gas passes is gradually reduced in a gas flow direction, and a plurality of vanes are installed in the passage.
However, the existing centrifugal compressor has poor stability and extremely high failure rate in the operation process, so that the production cost of enterprises is increased invisibly; meanwhile, the existing centrifugal compressor has poor working stability and cannot meet the market demand.
Disclosure of Invention
Aiming at the technical problems, the invention provides an air suspension type low-pressure pure oil-free centrifugal compressor which is stable and reliable in operation.
The technical scheme of the invention is as follows: an air suspension type low-pressure pure oil-free centrifugal compressor comprises a shell, a rotating shaft and a turbine; one end of the shell is movably connected with an end cover, a first cooling liquid inlet pipe and a first cooling liquid outlet pipe are arranged on the end cover, a cooling tank is arranged in the end cover, and the first cooling liquid inlet pipe and the first cooling liquid outlet pipe are respectively communicated with the cooling tank; a stator is clamped in the shell; clamping grooves are formed in two ends of the shell, and bearing seats are movably clamped in the two clamping grooves respectively; radial dynamic pressure bearings are movably clamped on the two bearing blocks;
the rotating shaft is movably clamped in the shell, two ends of the rotating shaft are suspended in the two radial dynamic pressure bearings, first dynamic pressure grooves are respectively arranged at positions of the rotating shaft corresponding to the two radial dynamic pressure bearings, and a rotor is movably sleeved on the rotating shaft;
the turbine comprises a volute and an impeller, the volute is movably arranged at the other end of the shell, an air inlet pipe is arranged at the end part of the volute, an air outlet pipe is arranged on the side wall of the volute, a pressure expansion cavity is arranged in an inner cavity of the volute, and the impeller is arranged inside the volute and is movably connected with the end part of the rotating shaft.
Furthermore, a cooling cavity is arranged on the inner wall of the shell, 5-15 heat exchange tubes are annularly arranged in the cooling cavity through an annular frame, each heat exchange tube is communicated through a connecting tube, a second cooling liquid inlet tube and a second cooling liquid outlet tube are arranged on the outer wall of the shell, the second cooling liquid inlet tube and the second cooling liquid outlet tube are respectively communicated with two ends of one of the heat exchange tubes, and heat generated when the rotor operates is taken out of the shell by the aid of second cooling liquid flowing in the heat exchange tubes, so that the purpose of heat dissipation of the rotor is achieved, and efficient operation of the rotor is guaranteed.
Further, the end cover is internally provided with a first axial pressure plate, one end, close to the end cover, of the rotating shaft is provided with a second axial pressure plate, a second dynamic pressure groove is formed in the first axial pressure plate in the annular direction, a third dynamic pressure groove is formed in the second axial pressure plate in the annular direction, and through the arrangement of the first axial pressure plate and the second axial pressure plate, axial thrust is applied to the rotating shaft through an air film generated between the second dynamic pressure groove and the third dynamic pressure groove, and the stability of the rotating shaft during operation is improved.
Furthermore, the third dynamic pressure groove arranged in the annular direction is positioned at the inner side of the second dynamic pressure groove arranged in the annular direction, and the third dynamic pressure groove is arranged at the inner side of the second dynamic pressure groove, so that the formed air film is more uniform and stable.
Furthermore, a rectifying disc is arranged at the opening of the air inlet pipe, and air entering the air inlet pipe is rectified by the rectifying disc, so that the surge phenomenon of the compressor is avoided.
Furthermore, the first dynamic pressure grooves are arc-shaped grooves, and the openings of two adjacent first dynamic pressure grooves are opposite; the first dynamic pressure groove with the opposite opening is arranged, so that a dynamic pressure film can be formed between the rotating shaft and the radial dynamic pressure bearing.
Further, the bearing shaft sleeves are arranged on the outer sides of the joints of the two bearing seats and the two radial dynamic pressure bearings, 4-8 bearing dynamic pressure grooves are evenly formed in the inner walls of the two bearing shaft sleeves, and through the arrangement of the bearing shaft sleeves, dynamic pressure films are formed between the bearing dynamic pressure grooves in the bearing shaft sleeves and the rotating shaft, so that the stability of the rotating shaft during suspension rotation is improved, and the noise generated during operation of the compressor is reduced.
Furthermore, the blades on the impeller are obliquely arranged along the rotation direction of the impeller, the inclination angle is 30-45 degrees, and the gathering effect of an air medium can be improved by arranging the oblique blades, so that the working efficiency of the centrifugal compression molding machine is improved.
Furthermore, the shell is made of aluminum alloy, the sealing rings are arranged at the connecting positions of the end cover, the volute and the shell, the shell made of aluminum alloy is prevented from being damaged by oxidation in the using process of the shell, the sealing rings are arranged, the air tightness of the inner cavity of the shell is effectively improved, and the performance stability of the compressor is further improved.
The working principle of the invention is as follows:
firstly, a first cooling liquid inlet pipe and a second cooling liquid inlet pipe are respectively connected with an external cooling liquid output device, and a first cooling liquid outlet pipe and a second cooling liquid outlet pipe are respectively connected with an external cooling liquid input device
Secondly, the rotor drives the rotating shaft and the impeller to rotate, the impeller sucks outside air into the volute from the air inlet pipe under the action of centrifugal force in the rotating process, the air is extruded in the volute and is compressed, and finally the air is discharged out of the volute through the air outlet pipe;
thirdly, when the rotor starts to rotate, the end part of the rotating shaft is in mechanical contact with the two radial dynamic pressure bearings, and along with the compression of air in the volute, part of the compressed air passes through a gap between the rotating shaft and the radial dynamic pressure bearings to form a dynamic pressure film under the action of the first dynamic pressure groove, so that radial thrust is provided for the rotating shaft, and the two ends of the rotating shaft are suspended in the two radial dynamic pressure bearings;
fourthly, in the rotating process of the rotating shaft, an axial static pressure film is formed between the third dynamic pressure groove on the second axial pressure plate and the second dynamic pressure groove on the first axial pressure plate, and axial pushing force is applied to the rotating shaft, so that the rotating shaft is always in an axial constant position.
Fifthly, heat generated by the rotating shaft is absorbed by the aid of first cooling liquid flowing in the cooling grooves in the end covers, and heat generated during operation of the rotor is taken out of the shell by the aid of second cooling liquid flowing in the heat exchange tubes, so that the purpose of heat dissipation of the rotor is achieved.
Compared with the prior art, the invention has the beneficial effects that: the invention has reasonable structural design and stable and reliable operation, and compared with the traditional compressor, the invention has the advantages of good high-speed stability, large air supply quantity, stable operation, high efficiency, simple structure, low noise, small occupied area, light weight, long service life, small maintenance quantity, no need of lubrication in the shell, no secondary pollution of gas by oil and the like; the dynamic pressure film formed between the radial dynamic pressure bearings and the rotating shaft provides radial supporting force for the rotating shaft, and the radial dynamic pressure bearing has the advantages of high speed stability, large bearing capacity, good lubricating performance, no need of an external air source, high temperature resistance and long service life, can effectively prevent surging and reduce energy consumption; the invention realizes no mechanical contact between the rotating shaft and the radial dynamic pressure bearing, avoids the friction loss between machines, does not need a gear box and a lubricating oil system, has no mechanical contact, greatly reduces the noise pollution generated during the operation of the compressor, improves the operation efficiency of the compressor, can ensure the normal operation of the compressor under the high temperature condition by the arranged cooling mechanism, and prolongs the service life of the compressor.
Drawings
FIG. 1 is a longitudinal section of the present invention;
FIG. 2 is a distribution diagram of the cooling channel of the present invention on the end cover;
FIG. 3 is a schematic view of the connection of the heat exchange tube of the present invention to an annular frame;
FIG. 4 is a schematic view of the connection of the first axial platen of the present invention to the end cap;
FIG. 5 is an enlarged schematic view at A of FIG. 1 of the present invention;
FIG. 6 is a distribution diagram of the shaft, rotor and stator of the present invention within the housing;
FIG. 7 is a distribution diagram of the first dynamic pressure groove of the present invention on the rotating shaft;
FIG. 8 is a right side view of the present invention;
wherein, 1-shell, 10-end cover, 100-first cooling liquid inlet pipe, 101-first cooling liquid outlet pipe, 102-cooling tank, 11-stator, 12-clamping groove, 13-bearing seat, 14-radial dynamic pressure bearing, 15-cooling cavity, 150-annular frame, 151-heat exchange pipe, 152-connecting pipe, 153-second cooling liquid inlet pipe, 154-second cooling liquid outlet pipe, 16-first axial pressure plate, 160-second dynamic pressure groove, 17-bearing shaft sleeve, 170-bearing dynamic pressure groove, 2-rotating shaft, 20-first dynamic pressure groove, 21-rotor, 22-second axial pressure plate, 220-third dynamic pressure groove, 3-turbine, 30-volute, 300-air inlet pipe, 301-air outlet pipe, 302-diffusion chamber, 303-rectifying disk, 31-impeller.
Detailed Description
Example 1: as shown in fig. 1 and 2, the air suspension type low-pressure pure oil-free centrifugal compressor comprises a shell 1, a rotating shaft 2 and a turbine 3; an end cover 10 is movably connected to one end of the shell 1, a first cooling liquid inlet pipe 100 and a first cooling liquid outlet pipe 101 are arranged on the end cover 10, a cooling groove 102 is arranged inside the end cover 10, and the first cooling liquid inlet pipe 100 and the first cooling liquid outlet pipe 101 are respectively communicated with the cooling groove 102; a stator 11 is clamped in the shell 1; two ends of the shell 1 are respectively provided with a clamping groove 12, and bearing seats 13 are movably clamped in the two clamping grooves 12; the two bearing blocks 13 are movably clamped with radial dynamic pressure bearings 14;
as shown in fig. 1, the rotating shaft 2 is movably clamped inside the housing 1, two ends of the rotating shaft 2 are cantilevered inside the two radial dynamic pressure bearings 14, first dynamic pressure grooves 20 are respectively arranged at positions of the rotating shaft corresponding to the two radial dynamic pressure bearings 14, and a rotor 21 is movably sleeved on the rotating shaft 2;
as shown in fig. 1 and 8, the turbine 3 includes a volute 30 and an impeller 31, the volute 30 is movably disposed at the other end of the housing 1, an air inlet pipe 300 is disposed at an end of the volute 30, an air outlet pipe 301 is disposed on a side wall of the volute 30, a pressure expansion chamber 302 is disposed in an inner cavity of the volute 30, and the impeller 31 is disposed inside the volute 30 and movably connected to an end of the rotating shaft 2
Example 2: as shown in fig. 1, 2, 3, 4 and 6, the air suspension type low-pressure pure oil-free centrifugal compressor comprises a shell 1, a rotating shaft 2 and a turbine 3; an end cover 10 is movably connected to one end of the shell 1, a first cooling liquid inlet pipe 100 and a first cooling liquid outlet pipe 101 are arranged on the end cover 10, a cooling groove 102 is arranged inside the end cover 10, and the first cooling liquid inlet pipe 100 and the first cooling liquid outlet pipe 101 are respectively communicated with the cooling groove 102; a stator 11 is clamped in the shell 1; two ends of the shell 1 are respectively provided with a clamping groove 12, and bearing seats 13 are movably clamped in the two clamping grooves 12; the two bearing blocks 13 are movably clamped with radial dynamic pressure bearings 14; a cooling cavity 15 is arranged on the inner wall of the shell 1, 10 heat exchange tubes 151 are annularly arranged in the cooling cavity 15 through an annular frame 150, each heat exchange tube 151 is communicated through a connecting tube 152, a second cooling liquid inlet tube 153 and a second cooling liquid outlet tube 154 are arranged on the outer wall of the shell 1, the second cooling liquid inlet tube 153 and the second cooling liquid outlet tube 154 are respectively communicated with two ends of one heat exchange tube 151, and heat generated when the rotor 21 operates is taken out of the shell 1 by using second cooling liquid flowing in the heat exchange tubes 151, so that the purpose of radiating the rotor 21 is achieved, and efficient operation of the rotor 21 is guaranteed; a first axial pressure plate 16 is arranged inside the end cover 10, and a second dynamic pressure groove 160 is arranged on the first axial pressure plate 16 in the circumferential direction;
as shown in fig. 1 and 4, the rotating shaft 2 is movably clamped inside the housing 1, two ends of the rotating shaft 2 are cantilevered inside the two radial dynamic pressure bearings 14, first dynamic pressure grooves 20 are respectively arranged at positions of the rotating shaft corresponding to the two radial dynamic pressure bearings 14, and a rotor 21 is movably sleeved on the rotating shaft 2; a second axial pressing plate 22 is arranged at one end, close to the end cover 10, of the rotating shaft 2, a third dynamic pressure groove 220 is arranged on the second axial pressing plate 22 in the circumferential direction, and through arrangement of the first axial pressing plate 16 and the second axial pressing plate 22, an axial thrust is applied to the rotating shaft 2 by utilizing an air film generated between the second dynamic pressure groove 160 and the third dynamic pressure groove 220, so that the stability of the rotating shaft 1 in operation is improved; the third dynamic pressure groove 220 arranged in the circumferential direction is positioned inside the second dynamic pressure groove 160 arranged in the circumferential direction, and the third dynamic pressure groove 220 is arranged inside the second dynamic pressure groove 160, so that the formed air film is more uniform and stable;
as shown in fig. 1 and 8, the turbine 3 includes a volute 30 and an impeller 31, the volute 30 is movably disposed at the other end of the housing 1, an air inlet pipe 300 is disposed at an end of the volute 30, an air outlet pipe 301 is disposed on a side wall of the volute, a pressure expansion chamber 302 is disposed in an inner cavity of the volute 30, and the impeller 31 is disposed inside the volute 30 and movably connected to an end of the rotating shaft 2.
Example 3: as shown in fig. 1, 2 and 5, the air suspension type low-pressure pure oil-free centrifugal compressor comprises a shell 1, a rotating shaft 2 and a turbine 3; an end cover 10 is movably connected to one end of the shell 1, a first cooling liquid inlet pipe 100 and a first cooling liquid outlet pipe 101 are arranged on the end cover 10, a cooling groove 102 is arranged inside the end cover 10, and the first cooling liquid inlet pipe 100 and the first cooling liquid outlet pipe 101 are respectively communicated with the cooling groove 102; a stator 11 is clamped in the shell 1; two ends of the shell 1 are respectively provided with a clamping groove 12, and bearing seats 13 are movably clamped in the two clamping grooves 12; the two bearing blocks 13 are movably clamped with radial dynamic pressure bearings 14; bearing shaft sleeves 17 are arranged on the outer sides of the joints of the two bearing blocks 13 and the two radial dynamic pressure bearings 14, 5 bearing dynamic pressure grooves 170 are uniformly arranged on the inner walls of the two bearing shaft sleeves 17, and through the arrangement of the bearing shaft sleeves 17, a dynamic pressure film is formed between the bearing dynamic pressure grooves 170 on the bearing shaft sleeves 17 and the rotating shaft 2, so that the stability of the rotating shaft 2 during suspension rotation is improved, and the noise of the compressor during operation is reduced;
as shown in fig. 1 and 7, the rotating shaft 2 is movably clamped inside the housing 1, two ends of the rotating shaft 2 are cantilevered inside the two radial dynamic pressure bearings 14, first dynamic pressure grooves 20 are respectively arranged at positions of the rotating shaft corresponding to the two radial dynamic pressure bearings 14, the first dynamic pressure grooves 20 are arc-shaped grooves, and openings of two adjacent first dynamic pressure grooves 20 are opposite; the formation of a dynamic pressure film between the rotating shaft 2 and the radial dynamic pressure bearing 14 is facilitated by arranging the first dynamic pressure groove 20 with opposite openings; the rotor 21 is movably sleeved on the rotating shaft 2;
as shown in fig. 1 and 8, the turbine 3 includes a volute 30 and an impeller 31, the volute 30 is movably disposed at the other end of the housing 1, an air inlet pipe 300 is disposed at an end of the volute 30, an air outlet pipe 301 is disposed on a side wall of the volute, a pressure expansion chamber 302 is disposed in an inner cavity of the volute 30, a rectifying disc 303 is disposed at an opening of the air inlet pipe 300, and by disposing the rectifying disc 303, air entering the air inlet pipe 300 is rectified to avoid surge of the compressor; impeller 31 sets up inside volute 30, and with the tip swing joint of pivot 2, and the blade on the impeller 31 sets up along the slope of impeller 31 direction of rotation, and inclination is 30 degrees, through setting up the blade of slope, can improve the effect of gathering together of air medium, and then improves centrifugal compression molding machine's work efficiency.
Example 4: as shown in fig. 1, 2, 3, 4, 5 and 6, the air suspension type low-pressure pure oil-free centrifugal compressor comprises a shell 1, a rotating shaft 2 and a turbine 3; an end cover 10 is movably connected to one end of the shell 1, a first cooling liquid inlet pipe 100 and a first cooling liquid outlet pipe 101 are arranged on the end cover 10, a cooling groove 102 is arranged inside the end cover 10, and the first cooling liquid inlet pipe 100 and the first cooling liquid outlet pipe 101 are respectively communicated with the cooling groove 102; a stator 11 is clamped in the shell 1; two ends of the shell 1 are respectively provided with a clamping groove 12, and bearing seats 13 are movably clamped in the two clamping grooves 12; the two bearing blocks 13 are movably clamped with radial dynamic pressure bearings 14; a cooling cavity 15 is arranged on the inner wall of the shell 1, 10 heat exchange tubes 151 are annularly arranged in the cooling cavity 15 through an annular frame 150, each heat exchange tube 151 is communicated through a connecting tube 152, a second cooling liquid inlet tube 153 and a second cooling liquid outlet tube 154 are arranged on the outer wall of the shell 1, the second cooling liquid inlet tube 153 and the second cooling liquid outlet tube 154 are respectively communicated with two ends of one heat exchange tube 151, and heat generated when the rotor 21 operates is taken out of the shell 1 by using second cooling liquid flowing in the heat exchange tubes 151, so that the purpose of radiating the rotor 21 is achieved, and efficient operation of the rotor 21 is guaranteed; a first axial pressure plate 16 is arranged inside the end cover 10, and a second dynamic pressure groove 160 is arranged on the first axial pressure plate 16 in the circumferential direction; bearing shaft sleeves 17 are arranged on the outer sides of the joints of the two bearing blocks 13 and the two radial dynamic pressure bearings 14, 5 bearing dynamic pressure grooves 170 are uniformly arranged on the inner walls of the two bearing shaft sleeves 17, and through the arrangement of the bearing shaft sleeves 17, a dynamic pressure film is formed between the bearing dynamic pressure grooves 170 on the bearing shaft sleeves 17 and the rotating shaft 2, so that the stability of the rotating shaft 2 during suspension rotation is improved, and the noise of the compressor during operation is reduced;
as shown in fig. 1 and 7, the rotating shaft 2 is movably clamped inside the housing 1, two ends of the rotating shaft 2 are cantilevered inside the two radial dynamic pressure bearings 14, first dynamic pressure grooves 20 are respectively arranged at positions of the rotating shaft corresponding to the two radial dynamic pressure bearings 14, the first dynamic pressure grooves 20 are arc-shaped grooves, and openings of two adjacent first dynamic pressure grooves 20 are opposite; the formation of a dynamic pressure film between the rotating shaft 2 and the radial dynamic pressure bearing 14 is facilitated by arranging the first dynamic pressure groove 20 with opposite openings; a rotor 21 is movably sleeved on the rotating shaft 2, a second axial pressing plate 22 is arranged at one end, close to the end cover 10, of the rotating shaft 2, a third dynamic pressure groove 220 is arranged on the second axial pressing plate 22 in the circumferential direction, and axial thrust is applied to the rotating shaft 2 by an air film generated between the second dynamic pressure groove 160 and the third dynamic pressure groove 220 by arranging the first axial pressing plate 16 and the second axial pressing plate 22, so that the stability of the rotating shaft 1 in operation is improved; the third dynamic pressure groove 220 arranged in the circumferential direction is positioned inside the second dynamic pressure groove 160 arranged in the circumferential direction, and the third dynamic pressure groove 220 is arranged inside the second dynamic pressure groove 160, so that the formed air film is more uniform and stable;
as shown in fig. 1 and 8, the turbine 3 includes a volute 30 and an impeller 31, the volute 30 is movably disposed at the other end of the housing 1, an air inlet pipe 300 is disposed at an end of the volute 30, an air outlet pipe 301 is disposed on a side wall of the volute, a pressure expansion chamber 302 is disposed in an inner cavity of the volute 30, a rectifying disc 303 is disposed at an opening of the air inlet pipe 300, and by disposing the rectifying disc 303, air entering the air inlet pipe 300 is rectified to avoid surge of the compressor; the impeller 31 is arranged inside the volute 30 and is movably connected with the end part of the rotating shaft 2; the blades on the impeller 31 are obliquely arranged along the rotating direction of the impeller 31, the inclination angle is 30 degrees, and the gathering effect of an air medium can be improved by arranging the oblique blades, so that the working efficiency of the centrifugal compressor is improved.
Example 5: as shown in fig. 1, 2, 3, 4, 5 and 6, the air suspension type low-pressure pure oil-free centrifugal compressor comprises a shell 1, a rotating shaft 2 and a turbine 3; an end cover 10 is movably connected to one end of the shell 1, a first cooling liquid inlet pipe 100 and a first cooling liquid outlet pipe 101 are arranged on the end cover 10, a cooling groove 102 is arranged inside the end cover 10, and the first cooling liquid inlet pipe 100 and the first cooling liquid outlet pipe 101 are respectively communicated with the cooling groove 102; a stator 11 is clamped in the shell 1; two ends of the shell 1 are respectively provided with a clamping groove 12, and bearing seats 13 are movably clamped in the two clamping grooves 12; the two bearing blocks 13 are movably clamped with radial dynamic pressure bearings 14; a cooling cavity 15 is arranged on the inner wall of the shell 1, 10 heat exchange tubes 151 are annularly arranged in the cooling cavity 15 through an annular frame 150, each heat exchange tube 151 is communicated through a connecting tube 152, a second cooling liquid inlet tube 153 and a second cooling liquid outlet tube 154 are arranged on the outer wall of the shell 1, the second cooling liquid inlet tube 153 and the second cooling liquid outlet tube 154 are respectively communicated with two ends of one heat exchange tube 151, and heat generated when the rotor 21 operates is taken out of the shell 1 by using second cooling liquid flowing in the heat exchange tubes 151, so that the purpose of radiating the rotor 21 is achieved, and efficient operation of the rotor 21 is guaranteed; a first axial pressure plate 16 is arranged inside the end cover 10, and a second dynamic pressure groove 160 is arranged on the first axial pressure plate 16 in the circumferential direction; bearing shaft sleeves 17 are arranged on the outer sides of the joints of the two bearing blocks 13 and the two radial dynamic pressure bearings 14, 5 bearing dynamic pressure grooves 170 are uniformly arranged on the inner walls of the two bearing shaft sleeves 17, and through the arrangement of the bearing shaft sleeves 17, a dynamic pressure film is formed between the bearing dynamic pressure grooves 170 on the bearing shaft sleeves 17 and the rotating shaft 2, so that the stability of the rotating shaft 2 during suspension rotation is improved, and the noise of the compressor during operation is reduced; the shell 1 is made of aluminum alloy, the connecting parts of the end cover 10, the volute 30 and the shell 1 are provided with sealing rings, the shell 1 made of aluminum alloy is arranged, oxidation damage of the shell 1 in the using process is avoided, the sealing rings are arranged, the air tightness of the inner cavity of the shell 1 is effectively improved, and the performance stability of the compressor is further improved;
as shown in fig. 1 and 7, the rotating shaft 2 is movably clamped inside the housing 1, two ends of the rotating shaft 2 are cantilevered inside the two radial dynamic pressure bearings 14, first dynamic pressure grooves 20 are respectively arranged at positions of the rotating shaft corresponding to the two radial dynamic pressure bearings 14, the first dynamic pressure grooves 20 are arc-shaped grooves, and openings of two adjacent first dynamic pressure grooves 20 are opposite; the formation of a dynamic pressure film between the rotating shaft 2 and the radial dynamic pressure bearing 14 is facilitated by arranging the first dynamic pressure groove 20 with opposite openings; a rotor 21 is movably sleeved on the rotating shaft 2, a second axial pressing plate 22 is arranged at one end, close to the end cover 10, of the rotating shaft 2, a third dynamic pressure groove 220 is arranged on the second axial pressing plate 22 in the circumferential direction, and axial thrust is applied to the rotating shaft 2 by an air film generated between the second dynamic pressure groove 160 and the third dynamic pressure groove 220 by arranging the first axial pressing plate 16 and the second axial pressing plate 22, so that the stability of the rotating shaft 1 in operation is improved; the third dynamic pressure groove 220 arranged in the circumferential direction is positioned inside the second dynamic pressure groove 160 arranged in the circumferential direction, and the third dynamic pressure groove 220 is arranged inside the second dynamic pressure groove 160, so that the formed air film is more uniform and stable;
as shown in fig. 1 and 8, the turbine 3 includes a volute 30 and an impeller 31, the volute 30 is movably disposed at the other end of the housing 1, an air inlet pipe 300 is disposed at an end of the volute 30, an air outlet pipe 301 is disposed on a side wall of the volute, a pressure expansion chamber 302 is disposed in an inner cavity of the volute 30, a rectifying disc 303 is disposed at an opening of the air inlet pipe 300, and by disposing the rectifying disc 303, air entering the air inlet pipe 300 is rectified to avoid surge of the compressor; the impeller 31 is arranged inside the volute 30 and is movably connected with the end part of the rotating shaft 2; the blades on the impeller 31 are obliquely arranged along the rotating direction of the impeller 31, the inclination angle is 30 degrees, and the gathering effect of an air medium can be improved by arranging the oblique blades, so that the working efficiency of the centrifugal compressor is improved.
When in work:
first, the first cooling liquid inlet pipe 100 and the second cooling liquid inlet pipe 153 are respectively connected with an external cooling liquid output device, and the first cooling liquid outlet pipe 101 and the second cooling liquid outlet pipe 154 are respectively connected with an external cooling liquid input device
Secondly, the rotor 21 drives the rotating shaft 2 and the impeller 31 to rotate, the impeller 31 sucks the outside air into the volute 30 from the air inlet pipe 300 under the action of centrifugal force in the rotating process, the air is extruded in the volute 30 and is compressed, and finally the air is discharged out of the volute 30 through the air outlet pipe 301;
thirdly, in the process that the rotor 21 starts to rotate, the end part of the rotating shaft 2 is in mechanical contact with the two radial dynamic pressure bearings 14, along with the compression of the air in the volute 30, part of the compressed air passes through the gap between the rotating shaft 2 and the radial dynamic pressure bearings 14, and a dynamic pressure film is formed under the action of the first dynamic pressure groove 20, so that radial thrust is provided for the rotating shaft 2, and the two ends of the rotating shaft 2 are suspended in the two radial dynamic pressure bearings 14;
fourthly, in the rotation process of the rotating shaft 2, an axial static pressure film is formed between the third dynamic pressure groove 220 on the second axial pressure plate 22 and the second dynamic pressure groove 160 on the first axial pressure plate 16, and an axial pushing force is applied to the rotating shaft 2, so that the rotating shaft 2 is always in an axial constant position.
Fifthly, the first cooling liquid flowing in the cooling groove 102 on the end cover 10 is used for absorbing heat generated by the rotating shaft, and the second cooling liquid flowing in the heat exchange tube 151 is used for taking the heat generated during the operation of the rotor 21 out of the shell 1, so that the purpose of radiating the rotor 21 is achieved.
Claims (10)
1. An air suspension type low-pressure pure oil-free centrifugal compressor is characterized by comprising a shell (1), a rotating shaft (2) and a turbine (3); an end cover (10) is movably connected to one end of the shell (1), a first cooling liquid inlet pipe (100) and a first cooling liquid outlet pipe (101) are arranged on the end cover (10), a cooling groove (102) is formed in the end cover (10), and the first cooling liquid inlet pipe (100) and the first cooling liquid outlet pipe (101) are respectively communicated with the cooling groove (102); a stator (11) is clamped in the shell (1); clamping grooves (12) are formed in two ends of the shell (1), and bearing seats (13) are movably clamped in the two clamping grooves (12) respectively; radial dynamic pressure bearings (14) are movably clamped on the two bearing blocks (13);
the rotating shaft (2) is movably clamped in the shell (1), two ends of the rotating shaft (2) are cantilevered in the two radial dynamic pressure bearings (14), first dynamic pressure grooves (20) are respectively arranged at positions of the rotating shaft corresponding to the two radial dynamic pressure bearings (14), and a rotor (21) is movably sleeved on the rotating shaft (2);
the turbine (3) comprises a volute (30) and an impeller (31), the volute (30) is movably arranged at the other end of the shell (1), an air inlet pipe (300) is arranged at the end part of the volute (30), an air outlet pipe (301) is arranged on the side wall, a pressure expansion cavity (302) is arranged in the inner cavity of the volute (30), and the impeller (31) is arranged inside the volute (30) and is movably connected with the end part of the rotating shaft (2).
2. The air suspension type low-pressure pure oil-free centrifugal compressor is characterized in that a cooling cavity (15) is formed in the inner wall of the shell (1), 5-15 heat exchange tubes (151) are annularly arranged in the cooling cavity (15) through an annular frame (150), the heat exchange tubes (151) are communicated through a connecting tube (152), a second cooling liquid inlet tube (153) and a second cooling liquid outlet tube (154) are arranged on the outer wall of the shell (1), and the second cooling liquid inlet tube (153) and the second cooling liquid outlet tube (154) are respectively communicated with two ends of one heat exchange tube (151).
3. The air suspension type low-pressure pure oil-free centrifugal compressor is characterized in that a first axial pressure plate (16) is arranged inside the end cover (10), a second axial pressure plate (22) is arranged at one end, close to the end cover (10), of the rotating shaft (2), a second dynamic pressure groove (160) is arranged on the first axial pressure plate (16) in the circumferential direction, and a third dynamic pressure groove (220) is arranged on the second axial pressure plate (22) in the circumferential direction.
4. The air suspension type low-pressure pure oil-free centrifugal compressor according to claim 3, wherein the annularly arranged third dynamic pressure groove (220) is located inside the annularly arranged second dynamic pressure groove (160).
5. The air suspension type low-pressure pure oil-free centrifugal compressor according to claim 1, characterized in that a rectifying disc (303) is arranged at an opening of the air inlet pipe (300).
6. The air suspension type low-pressure pure oil-free centrifugal compressor according to claim 1, wherein the first dynamic pressure grooves (20) are arc-shaped grooves, and the openings of two adjacent first dynamic pressure grooves (20) are opposite.
7. The air suspension type low-pressure pure oilless centrifugal compressor is characterized in that bearing shaft sleeves (17) are arranged on the outer sides of the joints of the two bearing blocks (13) and the two radial dynamic pressure bearings (14), and 4-8 bearing dynamic pressure grooves (170) are uniformly formed in the inner walls of the two bearing shaft sleeves (17).
8. The air suspension type low-pressure pure oil-free centrifugal compressor according to claim 1, wherein the blades on the impeller (31) are arranged in an inclined mode along the rotation direction of the impeller (31), and the inclined angle is 30-45 degrees.
9. The air suspension type low-pressure pure oilless centrifugal compressor according to claim 1, wherein the casing (1) is made of aluminum alloy, and sealing rings are arranged at the joints of the end cover (10), the volute (30) and the casing (1).
10. The air suspension type low-pressure pure oil-free centrifugal compressor according to claim 1, characterized in that the first dynamic pressure grooves (20) are arc-shaped grooves, and the openings of two adjacent first dynamic pressure grooves (20) are opposite.
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| CN202110592745.1A CN113417869A (en) | 2021-05-28 | 2021-05-28 | Air suspension type low-pressure pure oil-free centrifugal compressor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114703346A (en) * | 2022-05-17 | 2022-07-05 | 广德亿盛精密科技有限公司 | High-frequency heating and water cooling process for motor iron core of new energy automobile |
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