CN111425414A - Special gas high-speed centrifugal compressor adopting gas suspension bearing - Google Patents
Special gas high-speed centrifugal compressor adopting gas suspension bearing Download PDFInfo
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- CN111425414A CN111425414A CN202010123931.6A CN202010123931A CN111425414A CN 111425414 A CN111425414 A CN 111425414A CN 202010123931 A CN202010123931 A CN 202010123931A CN 111425414 A CN111425414 A CN 111425414A
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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
- F04D17/12—Multi-stage pumps
- F04D17/122—Multi-stage pumps the individual rotor discs being, one for each stage, on a common shaft and axially spaced, e.g. conventional centrifugal multi- stage compressors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/06—Cooling; Heating; Prevention of freezing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/10—Adaptations or arrangements of distribution members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/16—Filtration; Moisture separation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B41/00—Pumping installations or systems specially adapted for elastic fluids
- F04B41/02—Pumping installations or systems specially adapted for elastic fluids having reservoirs
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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
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
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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
- F04D29/10—Shaft sealings
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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
- F04D29/286—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for compressors multi-stage rotors
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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
- F04D29/5806—Cooling the drive system
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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
- F04D29/5826—Cooling at least part of the working fluid in a heat exchanger
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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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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
- H02K5/124—Sealing of shafts
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/08—Structural association with bearings
- H02K7/083—Structural association with bearings radially supporting the rotary shaft at both ends of the rotor
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Power Engineering (AREA)
- Fluid Mechanics (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a special gas high-speed centrifugal compressor adopting a gas suspension bearing, which comprises: the system comprises a first-stage compression unit, a second-stage compression unit, an interstage pipeline and a motor; taking the outlet air of the first-stage compression unit as the inlet air of the second-stage compression unit; the inner bearing unit of the motor cavity comprises a radial bearing and a thrust bearing, each bearing is a gas hydrostatic bearing, the radial bearing suspends the main shaft and the impeller through gas pressure, and the thrust bearing limits axial movement of the main shaft and the impeller during rotation through the gas pressure; the primary shaft seal and the secondary shaft seal which are respectively positioned at the two sides in the cavity of the motor are formed by a plurality of groups of honeycomb seals, and high-pressure isolation gas is introduced into the middles of the honeycomb seals; the compressor is also provided with a gas supply system, a cooling system and a gas recovery pipeline; the centrifugal compressor of the invention has good sealing performance and large flow and does not contain oil at all.
Description
Technical Field
The invention relates to the technical field of compressors, in particular to a special gas high-speed centrifugal compressor adopting a gas suspension bearing.
Background
The special gas compressor is a gas compressor except air, and common special gases include nitrogen, hydrogen, carbon monoxide, biogas, ammonia, chlorine, coal bed gas, helium and the like. The special gas is not allowed to leak, so the requirement on the sealing performance of the special gas compressor is higher, many special gases are used in high-pressure occasions, most of the special gas compressors are piston type or screw type, the flow is relatively small, oil cannot be completely contained, and the pollution problem exists.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides the special gas high-speed centrifugal compressor adopting the gas suspension bearing, the compressor has good sealing performance and large flow, does not contain oil at all, and avoids the problems of the existing special gas compressor.
In order to achieve the purpose, the invention adopts the following technical scheme that:
a special gas high-speed centrifugal compressor adopting a gas suspension bearing, wherein a body of the centrifugal compressor comprises: the system comprises a first-stage compression unit, a second-stage compression unit, an interstage pipeline and a motor;
the air outlet of the first-stage compression unit is connected with the air inlet of the second-stage compression unit through an interstage pipeline, namely the air outlet of the first-stage compression unit is used as the air inlet of the second-stage compression unit;
the first-stage compression unit and the second-stage compression unit are respectively arranged at two sides of the motor, and air inlets of the first-stage compression unit and the second-stage compression unit are deviated from each other;
the motor adopts the high-speed permanent-magnet machine of gas suspension bearing axle, include in the cavity of motor: the bearing unit, the main shaft, the motor stator, the primary shaft seal and the secondary shaft seal;
the primary shaft seal and the secondary shaft seal are respectively arranged at two sides in a cavity of the motor; the primary shaft seal is used for sealing the primary compression unit to ensure that gas in the primary compression unit cannot leak into a cavity of the motor; the secondary shaft seal is used for sealing the secondary compression unit, so that gas in the secondary compression unit cannot leak into a cavity of the motor;
the first-stage impeller in the first-stage compression unit and the second-stage impeller in the second-stage compression unit are respectively arranged at two ends of the main shaft in a back-to-back mode; the main shaft and the first-stage impeller and the second-stage impeller on two ends of the main shaft form a rotor;
the bearing unit sets up between one-level bearing seal and second grade bearing seal, includes: thrust bearings and radial bearings; each bearing in the bearing unit is a gas static pressure bearing; when the centrifugal compressor works, bearing gas is introduced into the bearing unit, and the radial bearing suspends the rotor through gas pressure; the thrust bearing limits the axial play of the rotor during rotation by gas pressure.
The centrifugal compressor is also provided with an air supply system; the gas supply system supplies bearing gas to the bearing unit, the gas supply system connects gradually according to the gaseous flow direction from advancing to going out and includes: the device comprises a piston compressor, a buffer tank, a first pressure reducing valve and a filter;
the air inlet end of the piston compressor is connected with the air outlet of the secondary compression unit of the centrifugal compressor; the air outlet end of the piston compressor is connected with a buffer tank for stabilizing pressure; the air outlet end of the buffer tank is connected with a first pressure reducing valve for pressure regulation; the gas outlet end of the first pressure reducing valve is connected with a filter for filtering gas; the air outlet end of the filter is connected with the air inlet of the bearing unit, and filtered air, namely bearing air, is introduced into the bearing unit.
And bearing air of the bearing unit is introduced into a cavity of the motor.
The primary shaft seal and the secondary shaft seal are sealed by honeycomb type shaft seals, each shaft seal is formed by a plurality of groups of honeycomb seals, and each group of honeycomb seals is an annular seal formed by a plurality of regular hexagonal Hastelloy.
Cavities are formed between two adjacent groups of honeycomb seals, isolation gas is introduced into any cavity for each shaft seal, the cavity pressure is calculated according to the pressure difference between the two groups of honeycomb seals on two sides of the selected cavity, and the air inlet pressure of the isolation gas is higher than the cavity pressure.
The centrifugal compressor is also provided with an air supply system; the gas supply system supplies isolation gas to the primary shaft seal and the secondary shaft seal respectively; the gas supply system is connected in proper order according to the flow direction of gas from advancing to going out and includes: the piston compressor, the buffer tank and the second pressure reducing valve;
the air inlet end of the piston compressor is connected with the air outlet of the secondary compression unit of the centrifugal compressor; the air outlet end of the piston compressor is connected with a buffer tank for stabilizing pressure; the air outlet end of the buffer tank is connected with a second pressure reducing valve for pressure regulation; and the air outlet end of the second pressure reducing valve is respectively connected with the primary shaft seal and the secondary shaft seal, and the pressure-regulated gas, namely the isolation gas, is respectively introduced into the primary shaft seal and the secondary shaft seal.
And the isolation gas of the primary shaft seal and the isolation gas of the secondary shaft seal are both introduced into a cavity of the motor.
The compressor is also provided with a cooling system; the cooling system is composed of a water chilling unit, and the water chilling unit is used for providing low-temperature refrigerating fluid;
and a heat exchanger is arranged at the air outlet of the piston compressor, and refrigerating fluid of the cooling system flows through the heat exchanger so as to cool the outlet gas of the piston compressor.
The compressor is also provided with a cooling system; the cooling system is composed of a water chilling unit, and the water chilling unit is used for providing low-temperature refrigerating fluid;
a motor cooling sleeve is arranged on the motor stator; the refrigerating fluid of the cooling system flows through the motor cooling jacket, so that the motor stator is cooled.
The compressor is also provided with a gas recovery pipeline; one end of the gas recovery pipeline is introduced into the cavity of the motor, and the other end of the gas recovery pipeline is connected with a gas inlet of the primary compression unit; and conveying the gas in the motor cavity to a gas inlet of the primary compression unit through the gas recovery pipeline.
The invention has the advantages that:
(1) the centrifugal compressor adopts the air suspension bearing shaft high-speed permanent magnet motor, the power of the motor can reach 200kW to the maximum, the rotating speed of the motor can reach 25000r/min under the power, and the volume flow of a single machine can reach 24000Nm under the air state3The single-machine pressure ratio can reach more than 3; compared with the special gas piston compressor 1 and the screw compressor in the prior art, the flow of the invention is improved by more than 2 times.
(2) The centrifugal compressor and the air supply system thereof realize the integration of the whole machine, are convenient to carry and use.
(3) Compared with the common high-speed centrifugal compressor driven by a speed increasing box, the centrifugal compressor provided by the invention adopts the gas suspension bearing shaft high-speed permanent magnet motor, so that the mechanical loss generated by the transmission of the speed increasing box is reduced, and the efficiency can be improved by 2% -3%; in addition, the bearing of the motor adopts a gas suspension bearing, so that the main shaft is in a suspension state during operation, the bearing is not directly contacted with the main shaft, the friction resistance is reduced, and the efficiency can be further improved by 1-2%; meanwhile, the impeller of the centrifugal compressor is designed by adopting a full controllable vortex efficient three-dimensional flow method, and compared with a common three-dimensional impeller, the efficiency can be improved by 2-3%. Therefore, the overall efficiency of the centrifugal compressor can reach more than 85 percent, and is improved by 5 to 8 percent compared with the common centrifugal compressor.
(4) The centrifugal compressor is driven by a motor, the volute is a static part, the main shaft is a rotating part, leakage between the static part and the rotating part is avoided when the compressor runs, shaft seal is needed to be added for sealing and isolation, the shaft seal is honeycomb seal, the honeycomb seal effect is improved by 2-3 times compared with the common labyrinth seal, and meanwhile, isolation gas is added in the middle of the honeycomb seal, so that gas in a compression unit can be further prevented from leaking into a cavity of the motor.
(5) The centrifugal compressor is provided with the cooling system, the cooling system utilizes the cold water unit 7 to provide low-temperature refrigerating fluid for cooling, the lowest temperature of the refrigerating fluid can reach minus 10 ℃, and the cooling capacity is greatly improved; meanwhile, the cooling system not only cools the motor stator, but also cools the bearing air supply and the shaft seal air supply; bearing air feed and bearing seal air feed are cooled by the heat exchanger 2 before entering the compressor, so that the temperature can be lower than 15 ℃, two low-temperature gases can further take away heat in the motor cavity and return to the air inlet of the compressor through the gas recovery pipeline, airflow circulation is realized, and the working environment of the motor is optimized.
(6) The centrifugal compressor has good sealing effect and can achieve zero leakage. The air supply of the bearing and the shaft seal is introduced into the cavity of the motor and finally returns to the air inlet of the centrifugal compressor through the air recovery pipeline, so that the air cannot leak out of the centrifugal compressor.
Drawings
FIG. 1 is an external schematic view of a special gas high-speed centrifugal compressor using gas suspension bearings according to the present invention.
Fig. 2 is a schematic internal view of a special gas high-speed centrifugal compressor using gas suspension bearings according to the present invention.
FIG. 3 is a system diagram of a special gas high-speed centrifugal compressor using gas suspension bearings according to the present invention.
Fig. 4 is an enlarged view of a portion of the shaft seal of the present invention.
FIG. 5 is a schematic view of the gas flow of the bearing gas and barrier gas of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, a special gas high-speed centrifugal compressor using a gas suspension bearing includes: a first-stage compression unit 10, a second-stage compression unit 20, an interstage pipeline 30 and a motor 40;
the outlet of the first-stage compression unit 10 is connected with the inlet of the second-stage compression unit 20 through an interstage pipeline 30, that is, the outlet of the first-stage compression unit 10 is used as the inlet of the second-stage compression unit 20. In this embodiment, the air inlet of the first-stage compression unit 10 is the air inlet of the compressor, and the air outlet of the second-stage compression unit 20 is the air outlet of the compressor.
The first-stage compression unit 10 and the second-stage compression unit 20 are respectively arranged on two sides of the motor, and air inlets of the first-stage compression unit 10 and the second-stage compression unit 20 are deviated from each other and are all outward.
As shown in the schematic view of figure 2,
the one-stage compression unit 10 includes: a first-stage volute 12 and a first-stage impeller 11;
the two-stage compression unit 20 includes: a secondary volute 22, a secondary impeller 21;
the motor 40 adopts the high-speed permanent-magnet machine of air suspension bearing axle, include in the cavity of motor 40: the bearing unit, the main shaft 70, the motor stator 41, the primary shaft seal 51 and the secondary shaft seal 52;
the primary shaft seal 21 and the secondary shaft seal 52 are respectively arranged at two sides in the cavity of the motor 40; the primary shaft seal 51 is used for sealing the primary compression unit 10, so that gas in the primary compression unit 10 cannot leak into a cavity of the motor 40; the secondary shaft seal 52 is used for sealing the secondary compression unit 20, so that the gas in the secondary compression unit 20 is prevented from leaking into the cavity of the motor 40;
the first-stage impeller 11 and the second-stage impeller 12 are respectively arranged at two ends of the main shaft in a back-to-back manner; the motor stator 41 drives the main shaft 70 to rotate and drives the primary impeller 11 and the secondary impeller 12 on the two ends of the main shaft 70 to rotate; the main shaft 70 and the first-stage impeller 11 and the second-stage impeller 12 on the two ends of the main shaft 70 form a rotor;
the bearing unit is arranged between a primary shaft seal 51 and a secondary shaft seal 52, and comprises: one thrust bearing 62 and two radial bearings 61; each bearing in the bearing unit is a gas static pressure bearing;
when the compressor works, bearing gas is introduced into the bearing unit, and the two radial bearings 61 suspend the rotor through gas pressure; the thrust bearing 62 limits the axial play of the rotor when rotating by gas pressure;
as shown in fig. 4, the primary shaft seal 51 and the secondary shaft seal 52 are both honeycomb seals, each shaft seal includes 4 sets of honeycomb seals, each set of honeycomb seals is an annular seal formed by a plurality of regular hexagonal hastelloy shapes, a cavity is formed between two adjacent honeycomb seals, strong vortex and barrier are generated when airflow passes through a pore zone, the airflow is decomposed into vortex in each small pore cavity, the airflow energy dissipation effect is enhanced, the sealing performance is increased, it is ensured that high-temperature gas of the compressor is not leaked into the cavity of the motor 40, and the leakage amount of the honeycomb seals is only about the common leakage amount of common labyrinth seals under the condition of the same gap; meanwhile, the isolation gas is introduced into the cavity formed between two adjacent honeycomb seals, in the embodiment, 3 cavities are formed by 4 groups of honeycomb seals, the isolation gas is introduced into any one cavity, in the embodiment, the isolation gas is introduced into the middle cavity, the cavity pressure is calculated according to the pressure difference of the honeycomb seals at two sides of the cavity, the air inlet pressure of the isolation gas is slightly higher than the cavity pressure, so that a high-pressure gas film can be formed, the temperature of the gas can be increased when the compressor operates, the performance of the motor can be influenced if the high-temperature gas leaks into the cavity of the motor 40, and the motor can be stopped if the high-temperature gas leaks into the cavity of the motor 40.
As shown in fig. 3 and 5, the centrifugal compressor of the present invention is further provided with a gas supply system, a cooling system, and a gas recovery pipe.
The gas supply system provides bearing gas for a bearing unit in the centrifugal compressor body, and provides bearing gas for the primary shaft seal 51 and the secondary shaft seal 52; the gas supply system includes: the device comprises a piston compressor 1, a buffer tank 3, a first pressure reducing valve 5, a second pressure reducing valve 4 and a filter 6;
the piston compressor 1 sucks high-pressure gas from a gas outlet of the whole centrifugal compressor, namely a gas outlet of the secondary compression unit 20, and feeds the high-pressure gas into the buffer tank 3 for buffering to ensure the stability of gas supply pressure, one part of the buffered high-pressure gas is respectively fed into the primary shaft seal 51 and the secondary shaft seal 52 through the second pressure reducing valve 4 to be used as isolation gas, and the other part of the buffered high-pressure gas is fed into the bearing unit through the first pressure reducing valve 5 and the filter 6 to be used as bearing gas;
the seal gas in the primary shaft seal 51 and the secondary shaft seal 52, and the bearing gas in the bearing unit, are all passed into the cavity of the motor 40.
The cooling system is composed of a water chilling unit 7, and the water chilling unit 7 provides low-temperature refrigerating fluid;
the cooling system cools the air supply of the bearing and the shaft seal in the centrifugal compressor body, a heat exchanger 2 is arranged between a piston compressor 1 and a buffer tank 3 in the air supply system, and low-temperature refrigerating fluid of the cooling system flows through the heat exchanger 2 and cools high-temperature high-pressure air at the outlet of the piston compressor 1 through the heat exchanger 2;
the cooling system cools the motor stator 41; a motor cooling jacket is arranged on the motor stator 41, and low-temperature refrigerating fluid of the cooling system flows through the motor cooling jacket to cool the motor stator 41 through the motor cooling jacket.
One end of the gas recovery pipeline is introduced into the cavity of the motor 40, and the other end of the gas recovery pipeline is connected with the gas inlet of the primary compression unit 10; the bearing gas and the shielding gas discharged from the cavity of the motor 40 are delivered to the gas inlet of the primary compression unit 10 through the gas recovery pipe.
The invention is not to be considered as limited to the specific embodiments shown and described, but is to be understood to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The utility model provides an adopt special gas high speed centrifugal compressor of gas suspension bearing which characterized in that, this centrifugal compressor's body includes: the system comprises a first-stage compression unit (10), a second-stage compression unit (20), an interstage pipeline (30) and a motor (40);
the air outlet of the first-stage compression unit (10) is connected with the air inlet of the second-stage compression unit (20) through an interstage pipeline (30), namely the air outlet of the first-stage compression unit (10) is used as the air inlet of the second-stage compression unit (20);
the first-stage compression unit (10) and the second-stage compression unit (20) are respectively arranged at two sides of the motor (40), and air inlets of the first-stage compression unit and the second-stage compression unit are deviated from each other;
motor (40) adopt the high-speed permanent-magnet machine of air suspension bearing axle, include in the cavity of motor (40): the device comprises a bearing unit, a main shaft (70), a motor stator (41), a primary shaft seal (51) and a secondary shaft seal (52);
the primary shaft seal (51) and the secondary shaft seal (52) are respectively arranged at two sides in a cavity of the motor (40); the primary shaft seal (51) is used for sealing the primary compression unit (10) to ensure that gas in the primary compression unit (10) cannot leak into a cavity of the motor (40); the secondary shaft seal (52) is used for sealing the secondary compression unit (20) to ensure that gas in the secondary compression unit (20) cannot leak into a cavity of the motor (40);
a first-stage impeller (11) in the first-stage compression unit (10) and a second-stage impeller (21) in the second-stage compression unit (20) are respectively arranged at two ends of the main shaft (70) in a back-to-back manner; the main shaft (70) and the primary impeller (11) and the secondary impeller (21) on the two ends of the main shaft (70) form a rotor;
the bearing unit is arranged between a primary shaft seal (51) and a secondary shaft seal (52), and comprises: a thrust bearing (62) and a radial bearing (61); each bearing in the bearing unit is a gas static pressure bearing; when the centrifugal compressor works, bearing gas is introduced into the bearing unit, and the radial bearing (61) suspends the rotor through gas pressure; the thrust bearing (62) limits axial play of the rotor during rotation by gas pressure.
2. A special gas high-speed centrifugal compressor adopting a gas suspension bearing according to claim 1, characterized in that the centrifugal compressor is also provided with a gas supply system; the gas supply system supplies bearing gas to the bearing unit, the gas supply system connects gradually according to the gaseous flow direction from advancing to going out and includes: the device comprises a piston compressor (1), a buffer tank (3), a first reducing valve (5) and a filter (6);
the air inlet end of the piston compressor (1) is connected with the air outlet of a secondary compression unit (20) of the centrifugal compressor; the air outlet end of the piston compressor (1) is connected with a buffer tank (3) for stabilizing pressure; the air outlet end of the buffer tank (3) is connected with a first pressure reducing valve (5) for pressure regulation; the gas outlet end of the first pressure reducing valve (5) is connected with a filter (6) for filtering gas; and the air outlet end of the filter (6) is connected with the air inlet of the bearing unit, and filtered air, namely bearing air, is introduced into the bearing unit.
3. A special gas high-speed centrifugal compressor adopting gas suspension bearings according to claim 2, characterized in that the bearing gas of the bearing unit is introduced into the cavity of the motor (40).
4. The special gas high-speed centrifugal compressor adopting the gas suspension bearing as recited in claim 1, wherein the primary shaft seal (51) and the secondary shaft seal (52) both adopt honeycomb shaft seal seals, each shaft seal is composed of a plurality of groups of honeycomb seals, and each group of honeycomb seals is an annular seal formed by a plurality of regular hexagonal hastelloy alloys.
5. The special gas high-speed centrifugal compressor adopting the gas suspension bearing as claimed in claim 4, wherein a cavity is formed between two adjacent sets of the honeycomb seals, each shaft seal is used for introducing isolation gas into any cavity, the cavity pressure is calculated according to the pressure difference between the two sets of the honeycomb seals at two sides of the selected cavity, and the inlet pressure of the isolation gas is higher than the cavity pressure.
6. A special gas high-speed centrifugal compressor adopting a gas suspension bearing according to claim 5, characterized in that the centrifugal compressor is also provided with a gas supply system; the gas supply system supplies isolation gas to the primary shaft seal and the secondary shaft seal respectively; the gas supply system is connected in proper order according to the flow direction of gas from advancing to going out and includes: the piston compressor (1), the buffer tank (3) and the second pressure reducing valve (4);
the air inlet end of the piston compressor (1) is connected with the air outlet of a secondary compression unit (20) of the centrifugal compressor; the air outlet end of the piston compressor (1) is connected with a buffer tank (3) for stabilizing pressure; the air outlet end of the buffer tank (3) is connected with a second pressure reducing valve (4) for pressure regulation; and the air outlet end of the second pressure reducing valve (4) is respectively connected with the primary shaft seal (51) and the secondary shaft seal (52), and the gas with the regulated pressure, namely the isolation gas, is respectively introduced into the primary shaft seal (51) and the secondary shaft seal (52).
7. A special gas high-speed centrifugal compressor adopting a gas suspension bearing according to claim 6, wherein the isolating gas of the primary shaft seal (51) and the isolating gas of the secondary shaft seal (52) are both introduced into a cavity of the motor (40).
8. A special gas high-speed centrifugal compressor adopting a gas suspension bearing according to claim 2 or 6, characterized in that the compressor is also provided with a cooling system; the cooling system is composed of a water chilling unit (7), and the water chilling unit (7) is used for providing low-temperature refrigerating fluid;
and a heat exchanger (2) is arranged at an air outlet of the piston compressor (1), and refrigerating fluid of the cooling system flows through the heat exchanger (2) so as to cool the outlet gas of the piston compressor (1).
9. A special gas high-speed centrifugal compressor adopting a gas suspension bearing according to claim 1, wherein the compressor is further provided with a cooling system; the cooling system is composed of a water chilling unit (7), and the water chilling unit (7) is used for providing low-temperature refrigerating fluid;
a motor cooling jacket is arranged on the motor stator (41); the refrigerating fluid of the cooling system flows through the motor cooling jacket, so that the motor stator (41) is cooled.
10. A special gas high-speed centrifugal compressor adopting a gas suspension bearing according to claim 3 or 7, characterized in that the compressor is also provided with a gas recovery pipeline; one end of the gas recovery pipeline is introduced into the cavity of the motor (40), and the other end of the gas recovery pipeline is connected with a gas inlet of the primary compression unit (10); and conveying the gas in the cavity of the motor (40) to a gas inlet of the primary compression unit (10) through the gas recovery pipeline.
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| CN112761973A (en) * | 2021-01-08 | 2021-05-07 | 西安交通大学 | Nitrogen compressor structure driven by ultra-high-speed permanent magnet motor |
| CN113606258A (en) * | 2021-08-12 | 2021-11-05 | 珠海格力电器股份有限公司 | Cooling system, air suspension air compressor, air conditioner and car |
| CN114962323A (en) * | 2022-06-10 | 2022-08-30 | 合肥通用机械研究院有限公司 | Low-vibration low-noise centrifugal fan adopting gas bearing |
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