CN111637086A - Centrifugal compressor air supply system for gas bearing support - Google Patents
Centrifugal compressor air supply system for gas bearing support Download PDFInfo
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- CN111637086A CN111637086A CN202010499892.XA CN202010499892A CN111637086A CN 111637086 A CN111637086 A CN 111637086A CN 202010499892 A CN202010499892 A CN 202010499892A CN 111637086 A CN111637086 A CN 111637086A
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- 239000003507 refrigerant Substances 0.000 claims abstract description 53
- 239000007788 liquid Substances 0.000 claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 238000001816 cooling Methods 0.000 claims description 10
- 230000000087 stabilizing effect Effects 0.000 claims description 10
- 238000013021 overheating Methods 0.000 claims description 5
- 229920006395 saturated elastomer Polymers 0.000 claims description 5
- 230000008676 import Effects 0.000 claims description 2
- 238000005057 refrigeration Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- 239000013589 supplement Substances 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004781 supercooling Methods 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000008236 heating water Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000013526 supercooled liquid Substances 0.000 description 1
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Classifications
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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
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/046—Bearings
- F04D29/047—Bearings hydrostatic; hydrodynamic
- F04D29/0473—Bearings hydrostatic; hydrodynamic for radial 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
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/06—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings
- F16C32/0603—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a gas cushion, e.g. an air cushion
- F16C32/0614—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a gas cushion, e.g. an air cushion the gas being supplied under pressure, e.g. aerostatic bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/06—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings
- F16C32/0662—Details of hydrostatic bearings independent of fluid supply or direction of load
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B31/00—Compressor arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2233/00—Monitoring condition, e.g. temperature, load, vibration
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
- F16C2240/12—Force, load, stress, pressure
- F16C2240/22—Fluid pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2360/00—Engines or pumps
- F16C2360/44—Centrifugal pumps
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention belongs to the technical field of refrigeration, and relates to a bearing gas supply system of a centrifugal compressor for supporting a gas bearing, which comprises an economizer connected with a condenser, wherein the outlet of the economizer is divided into three paths, the first path of economizer is directly communicated with the centrifugal compressor, the second path of economizer enters the centrifugal compressor through a second throttling valve and an evaporator, and the third path of economizer is communicated with the shell of the centrifugal compressor through a second one-way valve and an electronic expansion valve; the heat exchanger is connected with a water tank used for providing a heat source for the heat exchanger, and the heat exchanger is communicated with the centrifugal compressor. The refrigerant steam provided for the gas bearing is in an overheated state, so that the risk of containing liquid refrigerant in a gas supply system is reduced, and the stable and reliable operation of the gas bearing is ensured; and the stable and reliable air supply of the centrifugal compressor is ensured through the switching and control of different air supply loops.
Description
Technical Field
The invention belongs to the technical field of refrigeration, and particularly relates to a gas bearing supported centrifugal compressor bearing gas supply system for a refrigeration and heat pump system.
Background
The centrifugal refrigeration compressor adopting the gas bearing as the supporting structure has the characteristics of no oil, high speed and good stability, the gas bearing can be divided into a static pressure gas bearing and a dynamic pressure gas bearing, and compared with the dynamic pressure gas bearing, the bearing capacity of the static pressure gas bearing is larger, but a stable gas source is required to supply gas to the gas bearing to ensure the stable and reliable work of the gas bearing. In a conventional method, high-pressure gas discharged by a compressor can be used as a gas source to supply gas to the bearing or an external gas source, but the maximum pressure difference of a system can be changed due to the change of evaporation pressure or condensation pressure under a partial load working condition because a centrifugal refrigeration or heat pump unit works under the condition of a non-rated load working condition in most of working time, namely under the condition of a partial load working condition, and the gas supply pressure of the bearing can be insufficient at the moment. The change of the air supply pressure can be caused under the extreme working conditions such as other high-temperature working conditions or low-temperature working conditions. Insufficient supply pressure can result in reduced gas bearing load capacity, which can affect bearing and machine stability and reliability. The use of an external gas source adds complexity to the system and consumes excessive energy. Therefore, providing a stable and reliable gas source for the static pressure gas bearing is one of the important key technologies of the gas bearing centrifugal compressor.
However, in the prior art, that is, in the air supply scheme by heating the refrigerant storage tank, the refrigerant gas generated by heating the refrigerant liquid in the liquid storage tank is saturated vapor, and when the saturated vapor flows through the following components and pipelines such as the pipeline, the valve, the filter, etc., the refrigerant liquid is inevitably generated due to heat dissipation from the external environment, and the bearing operation may be unstable when the gas bearing is supplied with air by the liquid-containing refrigerant gas-liquid mixed phase, so there is a strong demand for providing a stable and reliable refrigerant gas with a certain superheat degree to solve this problem.
Disclosure of Invention
The invention aims to solve the problems in the prior art, further improves the existing gas supply system of the centrifugal compressor supported by the gas bearing, provides a method for supplementing gas, supplying gas to the bearing and cooling a motor of the centrifugal compressor, can provide refrigerant gas with a certain superheat degree, reduces the risk of liquid refrigerant in the gas supply system, and ensures the stable and reliable operation of the gas bearing.
The technical scheme of the invention is as follows:
a centrifugal compressor air feed system for gas bearing supports, including centrifugal compressor and condenser, centrifugal compressor's export is linked together with the condenser import, sets up gas bearing in the centrifugal compressor, air feed system still includes:
the refrigerant circulation path comprises an economizer connected with a first outlet of the condenser, the outlet of the economizer is divided into three paths, the first path is directly communicated with a 2-stage compressor air inlet pipeline of the centrifugal compressor from an upper outlet of the economizer, the second path is communicated with an inlet of the evaporator through a second throttle valve and enters a low-pressure stage inlet of the centrifugal compressor through an outlet of the evaporator, and the third path is communicated with a shell of the centrifugal compressor through a second one-way valve and an electronic expansion valve;
the system comprises an overheating air supply path, a condenser and a control system, wherein the overheating air supply path comprises a liquid storage device communicated with a second outlet of the condenser, the liquid storage device is sequentially connected with a first one-way valve, a refrigerant liquid pump, a thermal expansion valve and a heat exchanger, the heat exchanger is connected with a water tank for providing a heat source for the heat exchanger, and a temperature sensor and a circulating water pump are arranged at an outlet of the water tank; and a temperature sensing bulb of a thermostatic expansion valve is arranged at an outlet of the heat exchanger, and the heat exchanger is communicated with the centrifugal compressor sequentially through a gas filter, a pressure stabilizing valve and an electromagnetic valve.
Furthermore, an electric heater is arranged at the bottom of the water tank, the water tank and the heat exchanger form a water path circulation, and a circulating water pump and a temperature sensor for controlling the temperature of the outlet water are arranged between the water tank and the heat exchanger.
Furthermore, one end of the inlet of the heat exchanger is connected with the thermostatic expansion valve, and one end of the outlet of the heat exchanger is provided with a temperature sensing bulb for measuring the temperature of the refrigerant passing through the heat exchanger.
Further, the condenser first outlet communicates with the economizer inlet through a first throttling valve.
Further, the second outlet of the condenser is communicated with the inlet of the liquid storage device through a first control valve.
Furthermore, the economizer delivers refrigerant for cooling the motor to the shell of the centrifugal compressor through a second one-way valve and an electronic expansion valve, the cooled refrigerant enters the evaporator through an inlet of the evaporator communicated with the shell of the centrifugal compressor, and is converted into saturated superheated steam in the evaporator and then enters a low-pressure progressive port of the centrifugal compressor again.
The invention also provides another gas bearing supported centrifugal compressor gas supply system, which comprises a gas exhaust and gas supply branch besides the device and the path of the gas supply system, wherein the gas exhaust and gas supply branch comprises a centrifugal compressor, a third one-way valve, a second control valve, a pressure stabilizing tank, a gas filter, a pressure stabilizing valve and an electromagnetic valve, the gas filter, the pressure stabilizing valve and the electromagnetic valve are connected with the pressure stabilizing tank, the centrifugal compressor is communicated with the pressure stabilizing tank through the third one-way valve and the second control valve, and the pressure stabilizing tank is arranged between the heat exchanger and the gas filter and is communicated with the centrifugal compressor through the gas filter, the pressure stabilizing valve and the electromagnetic valve to form a gas exhaust and gas supply loop.
The invention also provides another economizer air supplementing form, namely, the economizer is replaced by a plate heat exchanger, and a circulation loop of the part related to the plate heat exchanger is correspondingly changed.
Furthermore, the outlet of the condenser is communicated with the plate heat exchanger in two ways, and after one way enters the plate heat exchanger through the first throttling valve, the air is directly communicated with the centrifugal compressor for air supplement from the outlet of the plate heat exchanger; and one path is directly connected with the plate heat exchanger from the outlet of the condenser, and then is respectively connected with the second throttle valve and the second one-way valve from the outlet of the plate heat exchanger, and is also connected with the second path and the third path of the refrigerant circulating path.
The invention has the beneficial effects that:
(1) the gas supply system provided by the invention is additionally provided with the heatable water tank, the heat exchanger, the thermostatic expansion valve, the temperature sensor and other parts to form a gas bearing gas supply system loop, so that the refrigerant steam provided for the gas bearing can be ensured to be in an overheated state, the risk of containing liquid refrigerant in the gas supply system is reduced, and the stable and reliable operation of the gas bearing is ensured; meanwhile, the system can ensure stable and reliable air supply in the starting process of the compressor, partial load working conditions and rated working conditions through the combination with the air exhaust and supply system of the compressor and the switching and control of different air supply loops.
(2) The gas supply system provided by the invention has the advantages that the temperature of circulating water can be regulated and controlled by installing the electric heater in the water tank, the outlet of the water tank is provided with the temperature sensor for detecting and controlling the outlet temperature, the outlet temperature can determine the evaporation temperature and the evaporation pressure of refrigerant in the heat exchanger, the refrigerant gas after heat exchange can be ensured to be superheated steam through the regulation effect of the thermal expansion valve, and the superheat degree can be regulated; compared with the original refrigerant liquid for cooling the motor, which is taken from the condenser, in the air supply system provided by the invention, the refrigerant liquid is taken from the economizer outlet liquid, the supercooling temperature of the economizer outlet refrigerant is lower, and the cooling effect is better; and the economizer form of the solution of the invention is equally applicable to the form of plate heat exchangers.
(3) In the air supply system provided by the invention, the refrigerant gas or the gas-liquid mixture cooled by the motor enters the inlet of the evaporator, so that the risk of air intake and liquid carrying caused by the fact that the cooled refrigerant is the gas-liquid mixture and directly enters the inlet of the compressor when the cooling flow of the refrigerant is large is prevented.
Drawings
FIG. 1 is a schematic diagram of a cycle of an air supply system according to embodiment 1 of the present invention;
FIG. 2 is a schematic diagram of a cycle of an air supply system according to embodiment 2 of the present invention;
FIG. 3 is a schematic diagram of the circulation of an air supply system according to embodiment 3 of the present invention;
in each of the above figures, 1, a centrifugal compressor; 2. a condenser; 3. a first throttle valve; 4. an economizer; 5. a second throttle valve; 6. an evaporator; 7. a first control valve; 8. a reservoir; 9. a first check valve; 10. a refrigerant liquid pump; 11. a thermostatic expansion valve; 111. a temperature sensing bulb; 12. a heat exchanger; 13. a water tank; 14. an electric heater; 15. a water circulating pump; 16. a gas filter; 17. a pressure maintaining valve; 18. an electromagnetic valve; 19. a second one-way valve; 20. an electronic expansion valve; 21. a third check valve; 22. a second control valve; 23. and (7) a pressure stabilizing tank.
Detailed Description
The technical solutions of the present invention will be described in detail and fully with reference to the following specific embodiments, and it should be understood 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. In the examples, the means used are conventional in the art, unless otherwise specified.
For a further understanding of the present invention, reference will now be made in detail to the following examples.
Example 1
As shown in figure 1, the gas bearing supported centrifugal compressor gas supply system provided by the invention comprises a centrifugal compressor 1 and a condenser 2, wherein an outlet of the centrifugal compressor 1 is communicated with an inlet of the condenser 2, and a gas bearing is arranged in the centrifugal compressor 1. The high-pressure gas from the centrifugal compressor 1 is cooled into refrigerant liquid by the condenser 2, and then enters the economizer 4 by the first throttling valve 3, and the refrigerant from the outlet of the economizer 4 is divided into three loops: the first path is refrigerant vapor, and returns to the position of a 2-stage compressor air inlet pipeline of the centrifugal compressor 1 from the upper outlet of the economizer 4 for air supplement; the second path is a main loop, the refrigerant liquid of the second path enters an evaporator 6 through a second throttling valve 5, and saturated or superheated steam from the evaporator 6 enters an inlet of a low-pressure stage of the centrifugal compressor 1 for compression; the third path is a cooling circuit, and in order to ensure that the motor of the centrifugal compressor 1 is cooled, refrigerant liquid of the cooling circuit enters the shell of the centrifugal compressor 1 from the lower outlet of the economizer 4 through the second one-way valve 19 and the electronic expansion valve 20 to cool the stator and the rotor of the motor, and cooled refrigerant gas enters the inlet of the evaporator 6 to start circulation again.
In order to ensure the gas supply pressure of the gas bearing and have a certain degree of superheat, the gas supply system is provided with a relevant loop to generate superheated refrigerant gas to supply gas for the gas bearing. The circuit is characterized in that refrigerant liquid is conveyed from a condenser 2 to a liquid storage device 8 through a first control valve 7, the refrigerant liquid discharged from the liquid storage device 8 enters a heat exchanger 12 after passing through a first one-way valve 9 and being subjected to pressure increase through a refrigerant liquid pump 10, a thermostatic expansion valve 11 is arranged between the refrigerant liquid pump 10 and the heat exchanger 12, the temperature of the refrigerant after passing through the heat exchanger 12 is measured through a temperature sensing bulb 111 arranged at the outlet of the heat exchanger 12, and the refrigerant gas passing through the outlet of the heat exchanger 12 is guaranteed to have a certain superheat degree. The heat source of the heat exchanger 12 is circulated through a water path on a heated water tank 13, an electric heater 14 is arranged at the bottom of the water tank 13 and used for heating water in the water tank 13, a temperature sensor and a circulating water pump 15 are arranged at the outlet of the water tank 13, and the temperature sensor and the circulating water pump 15 are arranged between the outlet of the water tank 13 and the heat exchanger 12; the evaporation temperature of the heat exchanger 12 can be controlled by controlling the temperature of the outlet water, and the superheat degree of refrigerant steam at the outlet of the heat exchanger 12 is ensured by the thermostatic expansion valve 11; the superheated refrigerant gas from the outlet of the heat exchanger 12 is supplied to the gas bearing in the centrifugal compressor 1 through the gas filter 16, the pressure maintaining valve 17 and the solenoid valve 18.
Example 2
As shown in fig. 2, this embodiment is based on embodiment 1 and adds an air supply system for discharging air through the centrifugal compressor 1, and the air supply branch for discharging air from the centrifugal compressor 1 enters the surge tank 23 through the third check valve 21 and the second control valve 22. The exhaust and air supply branch is added into the air supply system of the centrifugal compressor, and mainly the centrifugal compressor 1 is adopted to supply air through the third one-way valve 21 and the second control valve 22 when the centrifugal compressor 1 works at a normal rated value, namely the exhaust of the centrifugal compressor 1 is high, at the moment, the air supply through the path of the liquid storage device 8, the first one-way valve 9, the refrigerant liquid pump 10 and the heat exchanger 12 can be cut off, so that the overall energy consumption of the system is saved. When the centrifugal compressor 1 is in a variable working condition, the exhaust pressure of the centrifugal compressor 1 is reduced at the moment, two paths of gas are required to be jointly regulated and controlled to supply gas or the exhaust gas supply branch II is cut off to adopt an overheating gas supply path passing through the heat exchanger 12. The surge tank 23 is added in the case of a two-way air supply circuit to ensure stability of the air supply system and to provide a certain cushioning effect. When the centrifugal compressor 1 works normally, the exhaust state is superheated steam, and the stable and reliable gas supply of the gas bearing can be ensured through the regulation and control of two paths of gas.
Example 3
As shown in fig. 3, the present embodiment replaces the economizer 4 with a plate heat exchanger. This example is based on another form of air make-up of example 1, in the form of a plate heat exchanger.
The difference from example 1 is that: part of refrigerant liquid from the condenser 2 is throttled and depressurized by the first throttling valve 3, then the refrigerant vapor is generated in the plate heat exchanger 4 after heat exchange and temperature rise for system air supplement, most of the refrigerant liquid is throttled and throttled by the second throttling valve 5 after heat exchange with an air supplement loop, and then the refrigerant vapor enters the evaporator 6 to complete the refrigeration cycle. Part of the supercooled liquid from the plate heat exchanger is used for cooling the motor through the one-way valve 19 and the electronic expansion valve 20, and the cooling effect is better due to the increase of the supercooling degree.
The above description is only for the preferred embodiment of the present invention and should not be taken as limiting the invention, and any modifications, equivalents, improvements and the like made within the scope of the present invention should be included in the patent protection scope of the present invention. It is intended that all such modifications and variations be included within the scope of the invention as claimed, without departing from the spirit thereof.
Claims (9)
1. A centrifugal compressor air feed system for gas bearing supports, including centrifugal compressor and condenser, centrifugal compressor's export is linked together with the condenser import, sets up gas bearing in the centrifugal compressor, its characterized in that, air feed system still includes:
the refrigerant circulation path comprises an economizer connected with a first outlet of the condenser, the outlet of the economizer is divided into three paths, the first path is directly communicated with a 2-stage compressor air inlet pipeline of the centrifugal compressor from an upper outlet of the economizer, the second path is communicated with an inlet of the evaporator through a second throttle valve and enters a low-pressure stage inlet of the centrifugal compressor through an outlet of the evaporator, and the third path is communicated with a shell of the centrifugal compressor through a second one-way valve and an electronic expansion valve;
the system comprises an overheating air supply path, a condenser and a control system, wherein the overheating air supply path comprises a liquid storage device communicated with a second outlet of the condenser, the liquid storage device is sequentially connected with a first one-way valve, a refrigerant liquid pump, a thermal expansion valve and a heat exchanger, the heat exchanger is connected with a water tank for providing a heat source for the heat exchanger, and a temperature sensor and a circulating water pump are arranged at an outlet of the water tank; and a temperature sensing bulb of a thermostatic expansion valve is arranged at an outlet of the heat exchanger, and the heat exchanger is communicated with the centrifugal compressor sequentially through a gas filter, a pressure stabilizing valve and an electromagnetic valve.
2. The gas supply system for the gas bearing supported centrifugal compressor as claimed in claim 1, wherein the bottom of the water tank is provided with an electric heater, the water tank and the heat exchanger form a waterway cycle, and a circulating water pump and a temperature sensor for controlling the temperature of the outlet water are arranged between the water tank and the heat exchanger.
3. The gas supply system for a centrifugal compressor supported by a gas bearing as claimed in claim 1, wherein the heat exchanger has an inlet end connected to the thermostatic expansion valve and an outlet end provided with a bulb for measuring the temperature of the refrigerant after passing through the heat exchanger.
4. The gas supply system for a gas bearing supported centrifugal compressor of claim 1, wherein the condenser first outlet communicates with the economizer inlet through a first throttle valve.
5. The system for gas bearing supported centrifugal compressor gas supply of claim 1, wherein the condenser second outlet communicates with the inlet of the accumulator through a first control valve.
6. The gas supply system for a gas bearing supported centrifugal compressor of claim 1, wherein said economizer delivers refrigerant for cooling the motor to the housing of the centrifugal compressor through a second one-way valve and an electronic expansion valve, the cooled refrigerant entering said evaporator through an inlet of the evaporator communicating with said centrifugal compressor housing, being converted to saturated or superheated vapor within said evaporator and re-entering a low pressure stage inlet of said centrifugal compressor.
7. A gas supply system for a centrifugal compressor supported by a gas bearing according to claims 1-6 further comprising a gas exhaust and supply branch comprising a centrifugal compressor, a third one-way valve, a second control valve, a surge tank and said gas filter, surge valve and solenoid valve connected to the surge tank, wherein said centrifugal compressor is connected to said surge tank through said third one-way valve and second control valve, said surge tank is disposed between said heat exchanger and gas filter and is connected to said centrifugal compressor through said gas filter, surge valve and solenoid valve to form a gas exhaust and supply loop.
8. A centrifugal compressor gas supply system for gas bearing support according to claims 1-6, wherein the economizer in the gas supply system employs a plate heat exchanger.
9. The gas supply system for the gas bearing supported centrifugal compressor as claimed in claim 8, wherein the outlet of the condenser is communicated with the plate heat exchanger in two ways, and after one way enters the plate heat exchanger through the first throttle valve, the gas supply system is directly communicated with the centrifugal compressor from the outlet of the plate heat exchanger for gas supply; and one path is directly connected with the plate heat exchanger from the outlet of the condenser, and then is respectively connected with the second throttle valve and the second one-way valve from the outlet of the plate heat exchanger, and is also connected with the second path and the third path of the refrigerant circulating path.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010499892.XA CN111637086A (en) | 2020-06-04 | 2020-06-04 | Centrifugal compressor air supply system for gas bearing support |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010499892.XA CN111637086A (en) | 2020-06-04 | 2020-06-04 | Centrifugal compressor air supply system for gas bearing support |
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| CN111637086A true CN111637086A (en) | 2020-09-08 |
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| CN202010499892.XA Pending CN111637086A (en) | 2020-06-04 | 2020-06-04 | Centrifugal compressor air supply system for gas bearing support |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113833762A (en) * | 2021-09-08 | 2021-12-24 | 青岛海尔空调电子有限公司 | Air supply system and refrigerating system for suspension bearing |
| CN113959127A (en) * | 2021-09-16 | 2022-01-21 | 青岛海尔空调电子有限公司 | Control method, device, equipment and medium for air supply system of refrigeration equipment |
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| CN113833762A (en) * | 2021-09-08 | 2021-12-24 | 青岛海尔空调电子有限公司 | Air supply system and refrigerating system for suspension bearing |
| CN113833762B (en) * | 2021-09-08 | 2024-04-19 | 青岛海尔空调电子有限公司 | Air supply system and refrigerating system for suspension bearing |
| CN113959127A (en) * | 2021-09-16 | 2022-01-21 | 青岛海尔空调电子有限公司 | Control method, device, equipment and medium for air supply system of refrigeration equipment |
| CN113959106A (en) * | 2021-10-29 | 2022-01-21 | 青岛海尔空调电子有限公司 | Method and device for controlling refrigerant circulation system and refrigerant circulation system |
| CN114087290A (en) * | 2021-11-08 | 2022-02-25 | 青岛海尔空调电子有限公司 | Air supply system and refrigerating system for suspension bearing |
| CN114087290B (en) * | 2021-11-08 | 2024-04-19 | 青岛海尔空调电子有限公司 | Air supply system and refrigerating system for suspension bearing |
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Application publication date: 20200908 |