CN111780443B - Air suspension bearing air supply system, air supply method and centrifugal water chilling unit - Google Patents
Air suspension bearing air supply system, air supply method and centrifugal water chilling unit Download PDFInfo
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- CN111780443B CN111780443B CN202010641383.6A CN202010641383A CN111780443B CN 111780443 B CN111780443 B CN 111780443B CN 202010641383 A CN202010641383 A CN 202010641383A CN 111780443 B CN111780443 B CN 111780443B
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- 239000000725 suspension Substances 0.000 title claims abstract description 83
- 238000000034 method Methods 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title abstract description 13
- 239000007788 liquid Substances 0.000 claims abstract description 218
- 239000003507 refrigerant Substances 0.000 claims abstract description 108
- 230000001502 supplementing effect Effects 0.000 claims abstract description 60
- 238000009434 installation Methods 0.000 claims abstract description 14
- 230000005484 gravity Effects 0.000 claims abstract description 13
- 230000001105 regulatory effect Effects 0.000 claims description 86
- 238000010438 heat treatment Methods 0.000 claims description 33
- 238000001704 evaporation Methods 0.000 claims description 9
- 238000010586 diagram Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
Classifications
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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
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
- F25B1/04—Compression machines, plants or systems with non-reversible cycle with compressor of rotary type
- F25B1/047—Compression machines, plants or systems with non-reversible cycle with compressor of rotary type of screw type
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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
- F25B45/00—Arrangements for charging or discharging refrigerant
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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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention provides an air supply system and an air supply method of an air suspension bearing and a centrifugal water chilling unit, wherein the air supply system of the air suspension bearing comprises the following components: the air suspension compressor and a refrigerant circulation loop where the air suspension compressor is positioned; the liquid inlet of the first air supply loop is connected with the liquid taking port of the refrigerant circulation loop and is used for taking liquid from the liquid taking port, and the air outlet of the first air supply loop is connected to the air suspension compressor; the first air supply loop comprises a liquid supplementing tank and an air supplying tank, the installation height of the liquid supplementing tank and the air supplying tank is lower than that of the liquid taking port, and the refrigerant in the refrigerant circulation loop can flow into the first air supply loop from the liquid taking port under the action of gravity. The air supply system of the air suspension bearing is suitable for a centrifugal water chilling unit adopting the air suspension bearing, and realizes continuous and stable air supply to the air suspension bearing by means of gravity and a communicating vessel principle through different installation heights of a liquid taking port, a liquid supplementing tank and an air supply tank, thereby ensuring reliable and stable operation of the unit.
Description
Technical Field
The invention belongs to the technical field of centrifugal water chilling units, and particularly relates to an air supply system and an air supply method of an air suspension bearing and a centrifugal water chilling unit.
Background
The centrifugal water chilling unit is generally used in various building air conditioners, the compressor bearing of the centrifugal unit mainly adopts an oil lubrication bearing, an electromagnetic bearing and an air suspension bearing, the oil lubrication bearing is adopted, an oil supply system is required to be added, lubricating oil also leaks into a refrigerant to cause refrigerant pollution, and in addition, friction occurs between the lubricating oil and a rotor to cause energy loss; the centrifugal compressor adopting the electromagnetic bearing has the advantages that a whole set of control system of the bearing is complex, the impact energy of the system is poor, and in addition, additional power-off protection means for protecting the bearing and the like are required to be added.
The air suspension bearing is a technology for supporting the rotor by utilizing the pressure generated by the gas between the bearing and the rotor, is an oil-free bearing, has small friction resistance between the gas and the rotor, does not need a complex control system, and has a simple structure. However, the bearing needs to adopt a gas supply system to supply gas for bearing operation, and whether the design of the gas supply system reasonably directly influences the working performance of the centrifugal compressor. The air supply system in the prior art adopts a refrigerant pump to pump liquid refrigerant from a condenser and supply the liquid refrigerant into an air storage tank, an electric heater is arranged on the air storage tank, and the electric heater heats and boosts the refrigerant and supplies air to a bearing. By adopting the scheme of the refrigerant pump, when the liquid level of the air supply tank is controlled, the liquid level is low, the pump is started, the liquid level is high, guan Beng, and the refrigerant pump needs to be started and stopped frequently, so that the reliability of the refrigerant pump is reduced, and the reliability of an air supply system is reduced. Meanwhile, the pump consumes a part of electric energy, so that the energy efficiency of the unit is reduced, the cost of the pump is high, and the cost of the unit is increased.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is that the air supply system of the air suspension bearing is unreasonable in design, and the refrigerant pump is frequently started and stopped, so that the reliability is low, and the air supply system, the air supply method and the centrifugal water chilling unit of the air suspension bearing are provided.
In order to solve the above problems, the present invention provides an air supply system for an air suspension bearing, comprising:
the air suspension compressor and a refrigerant circulation loop where the air suspension compressor is positioned;
the liquid inlet of the first air supply loop is connected with the liquid taking port of the refrigerant circulation loop and is used for taking liquid from the liquid taking port, and the air outlet of the first air supply loop is connected to the air suspension compressor;
the first air supply loop comprises a liquid supplementing tank and an air supplying tank, the installation height of the liquid supplementing tank and the air supplying tank is lower than that of the liquid taking port, and the refrigerant in the refrigerant circulation loop can flow into the first air supply loop from the liquid taking port under the action of gravity.
Preferably, the air supply system further comprises a second air supply loop, the second air supply loop is arranged between the condenser of the refrigerant circulation loop and the air supply tank in the first air supply loop, and a check valve from the condenser to the air supply tank is arranged on the second air supply loop.
Preferably, the refrigerant circulation loop comprises an evaporator, the liquid taking port is arranged in a liquid area of the evaporator, and the installation height of the liquid supplementing tank and the gas supplying tank is lower than that of the evaporator.
Preferably, the height from the lowest point of the evaporator shell to the ground is h1, the height from the lowest point of the liquid supplementing tank 3 shell to the ground is h2, and the height from the lowest point of the air supplying tank 4 to the ground is h3, so that h1 > h2 > h3 can be satisfied.
Preferably, the refrigerant circulation loop comprises a condenser, the liquid taking port is arranged in a liquid area of the condenser, and the mounting heights of the liquid supplementing tank and the gas supplying tank are lower than those of the condenser.
Preferably, the height from the lowest point of the condenser shell to the ground is h5, the height from the lowest point of the liquid supplementing tank 3 shell to the ground is h2, and the height from the lowest point of the air supplying tank 4 to the ground is h3, so that h5 > h2 > h3 can be satisfied.
Preferably, the refrigerant circulation loop comprises a flash evaporator, the liquid taking port is arranged in a liquid area of the flash evaporator, and the installation height of the liquid supplementing tank and the gas supplying tank is lower than that of the flash evaporator.
Preferably, the height from the lowest point of the flash generator shell to the ground is h6, the height from the highest point of the liquid supplementing tank shell to the ground is h2, the height from the lowest point of the liquid supplementing tank 3 shell to the ground is h2, the height from the lowest point of the air supplying tank 4 to the ground is h3, and h6 > h2 > h3 can be satisfied.
Preferably, the volume of the liquid supplementing tank is V1, the volume of the gas supplying tank is V2, and V1 is less than V2.
Preferably, the air supply tank is provided with a heating device which is opened or closed according to the liquid level and the pressure in the air supply tank.
Preferably, the air supply tank is also provided with a liquid level sensor and a pressure sensor.
Preferably, the first air supply loop comprises a first passage, a second passage and a third passage, the first passage is arranged between the liquid taking port and the liquid supplementing tank, the second passage is arranged between the liquid supplementing tank and the air supply tank, and the third passage is arranged between the air supply tank and the air suspension compressor.
Preferably, the first passage is provided with a fourth regulating valve, the second passage is provided with a third regulating valve, and the third passage is provided with a fifth regulating valve.
Preferably, the refrigerant circulation loop is further provided with an adjusting return air port, the first air supply loop is further provided with a first bypass passage and a second bypass passage, the first bypass passage is arranged between the liquid supplementing tank and the adjusting return air port, and the second bypass passage is arranged between the air supply tank and the liquid supplementing tank.
Preferably, the first bypass passage is provided with a first regulating valve and the second bypass passage is provided with a second regulating valve.
A gas supply method employing a gas suspension bearing gas supply system, comprising:
when the gas suspension compressor is in a starting stage and a shutdown stage or the pressure difference between the condensing pressure and the evaporating pressure in the refrigerant circulation system is smaller than a preset value, the liquid refrigerant enters the liquid supplementing tank through the liquid taking port, and the gas supplying tank supplies gas to the gas suspension bearing in the gas suspension compressor.
The aim and the technical problems of the invention can be further realized by adopting the following technical measures.
Preferably, when the pressure difference between the condensing pressure and the evaporating pressure in the refrigerant circulation system is greater than or equal to a preset value, the gaseous refrigerant in the condenser in the refrigerant circulation system is adopted to supply air to the air suspension bearing.
Preferably, when the first air supply circuit comprises a first passage, a second passage; the first bypass passage is provided with a first regulating valve, the second bypass passage is provided with a second regulating valve, the first passage is provided with a fourth regulating valve, when the second passage is provided with a third regulating valve,
the first regulating valve and the fourth regulating valve are controlled to be opened, the second regulating valve and the third regulating valve are controlled to be closed, and the liquid refrigerant enters the liquid supplementing tank through the liquid taking port;
when the liquid level of the liquid refrigerant in the gas supply tank is smaller than H1, liquid supplementing is carried out, the first regulating valve and the fourth regulating valve are controlled to be closed, the second regulating valve and the third regulating valve are controlled to be opened, and the liquid refrigerant flows into the gas supply tank from the liquid supplementing tank.
Preferably, when the fluid is replenished, the first regulating valve and the fourth regulating valve are controlled to be opened after the preset time, and the second regulating valve and the third regulating valve are controlled to be closed.
Preferably, when the heating device is provided in the air supply tank,
when the liquid refrigerant level in the gas supply tank is more than or equal to H0, the heating device is started, otherwise, the heating device is closed;
and/or when the pressure in the air supply tank is less than P1, the heating device is started; when the pressure in the P1 is less than or equal to the pressure in the air supply tank is less than or equal to P2, the heating device keeps the current state; when the pressure in the air supply tank is more than P2, the heating device is closed.
A centrifugal water chilling unit adopts the air suspension bearing air supply system or the air supply method.
The air supply system, the air supply method and the centrifugal water chilling unit of the air suspension bearing provided by the invention have at least the following beneficial effects:
the air supply system of the air suspension bearing is suitable for a centrifugal water chilling unit adopting the air suspension bearing, and solves the problems that in the prior art, the air suspension bearing air supply system adopts a refrigerant pump to pump liquid refrigerant from a condenser, the refrigerant pump needs to be started and stopped frequently, the reliability of the refrigerant pump is reduced, the reliability of the air supply system is reduced, meanwhile, the energy consumption of the refrigerant pump is larger, and the overall energy consumption of the unit is increased. Through the installation height difference with getting liquid mouth, liquid feed pot, air feed jar, with the help of gravity and communicating vessel principle, realize the continuous stable air feed to gas suspension bearing, guarantee the reliable steady operation of unit.
Drawings
FIG. 1 is a schematic diagram of an air supply system for an air suspension bearing according to an embodiment of the present invention;
FIG. 2 is a schematic diagram showing the installation of an evaporator, a liquid feed tank and a gas feed tank in the first embodiment;
FIG. 3 is a schematic diagram of an air supply system for an air suspension bearing according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an air supply system of an air suspension bearing according to a first embodiment of the present invention.
The reference numerals are expressed as:
1. a gas suspension compressor; 2. a first air supply circuit; 3. a liquid supplementing tank; 4. a gas supply tank; 5. a second air supply circuit; 6. a one-way valve; 7. an evaporator; 8. a condenser; 9. a flash; 10. a heating device; 11. a liquid level sensor; 12. a pressure sensor; 13. a first passage; 14. a second passage; 15. a third passage; 16. a fourth regulating valve; 17. a third regulating valve; 18. a fifth regulating valve; 19. a filtering device; 20. a first bypass path; 21. a second bypass path; 22. a first regulating valve; 23. a second regulating valve; 24. a throttle valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to specific embodiments of the present invention and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1 to 4, the present application provides an air suspension bearing air supply system, comprising: the air suspension compressor 1 and a refrigerant circulation loop where the air suspension compressor is positioned; the liquid inlet of the first air supply loop 2 is connected with the liquid taking port of the refrigerant circulation loop and is used for taking liquid from the liquid taking port, and the air outlet of the first air supply loop 2 is connected to the air suspension compressor 1; the first air supply loop 2 comprises a liquid supplementing tank 3 and an air supply tank 4, the installation height of the liquid supplementing tank 3 and the air supply tank 4 is lower than that of the liquid taking port, and the refrigerant in the refrigerant circulation loop can flow into the first air supply loop 2 from the liquid taking port under the action of gravity.
The utility model provides an air suspension bearing air feed system is applicable to the centrifugal water chilling unit that adopts air suspension bearing, has solved prior art air suspension bearing air feed system and has adopted the refrigerant pump to follow condenser extraction liquid refrigerant, and the refrigerant pump needs frequent start-stop, leads to the reliability of refrigerant pump to reduce, leads to air feed system's reliability to reduce, and the refrigerant pump power consumption is great simultaneously, has increased the whole power consumption of unit. Through the installation height difference with getting liquid mouth, liquid feed pot, air feed jar, with the help of gravity and communicating vessel principle, realize the continuous stable air feed to gas suspension bearing, guarantee the reliable steady operation of unit.
Preferably, the air supply system further comprises a second air supply circuit 5, the second air supply circuit 5 is arranged between a condenser 8 of the refrigerant circulation circuit and the air supply tank 4 in the first air supply circuit 2, and a check valve 6 from the condenser 8 to the air supply tank 4 is arranged on the second air supply circuit 5.
The second air supply loop 5 in this application is used for running normally at the cooling water set, and condenser pressure and the evaporimeter pressure differential are big enough in the unit, and gaseous refrigerant just can satisfy the air feed demand of air suspension bearing in the condenser this moment, consequently, through second air supply loop 5 with condenser 8 and air feed tank 4 one-way intercommunication to realize that unit condensation evaporation pressure differential is big enough, when the condenser can satisfy the bearing air feed, can be the foremost minimum loss's air feed.
As shown in fig. 1 and 2, in the first embodiment of the present application, the refrigerant circulation circuit includes an evaporator 7, the liquid taking port is disposed in the liquid area of the evaporator 7, and the installation heights of the liquid replenishing tank 3 and the gas supply tank 4 are lower than the evaporator 7.
In the refrigerating system, the refrigerant exists in the evaporator or the heat exchanger in two forms of gas and liquid at the same time, and because of the action of gravity, the gas is in the upper part and the liquid is in the lower part, obvious gas areas and liquid areas are formed in the inner part, and a liquid taking port is arranged in the liquid area of the evaporator 7, so that the effect of extracting the liquid refrigerant is realized.
In the first air supply system of this embodiment, the first air supply loop 2 takes liquid through the evaporator 7, the liquid level in the evaporator 7 in the refrigerant circulation system is higher, the normal performance of the evaporator 7 is not affected after liquid taking, and compared with the method of extracting liquid refrigerant from the condenser in the prior art, the liquid taking reliability from the evaporator 7 is higher, and the influence on the refrigerating performance of the unit is minimal.
Preferably, in order to enable the liquid refrigerant to smoothly flow into the first air supply loop 2 under the action of gravity, the height from the lowest point of the shell of the evaporator 7 to the ground is h1, the height from the lowest point of the shell of the liquid supplementing tank 3 to the ground is h2, and the height from the lowest point of the air supply tank 4 to the ground is h3, so that h1 > h2 > h3 is satisfied.
In the centrifugal chiller, although the liquid refrigerant level in the evaporator 7 is the highest, the pressure in the evaporator is the lowest relative to the pressure in the condenser 8 and the flash evaporator 9, and when the liquid is taken from the evaporator 7 by the first air supply loop 2, the phenomenon that the pressure fluctuation in the liquid replenishing tank 3 and the air supply tank 4 is large may occur, so that the air supply system of the present application can also take liquid from the condenser 8 and the flash evaporator 9, and the solutions corresponding to the second embodiment and the third embodiment respectively correspond to the schemes. The liquid level of the liquid refrigerant in the condenser 8 and the flash evaporator 9 is lower than that in the evaporator 7, but the pressure fluctuation in the liquid replenishing tank 3 and the gas supply tank 4 caused in the liquid replenishing process is smaller due to the larger pressure.
As shown in fig. 3, in the second embodiment of the present application, the refrigerant circulation circuit includes a condenser 8, the liquid taking port is disposed in the liquid area of the condenser 8, and the installation heights of the liquid replenishing tank 3 and the gas supply tank 4 are lower than the condenser 8.
Preferably, in order to enable the liquid refrigerant to smoothly flow into the first air supply loop 2 under the action of gravity, the height from the lowest point of the shell of the condenser 8 to the ground is h5, the height from the lowest point of the shell of the liquid supplementing tank 3 to the ground is h2, and the height from the lowest point of the air supply tank 4 to the ground is h3, so that h5 > h2 > h3 is satisfied.
As shown in fig. 4, in the third embodiment of the present application, the refrigerant circulation circuit includes a flash tank 9, the liquid taking port is disposed in the liquid area of the flash tank 9, and the installation heights of the liquid replenishing tank 3 and the gas supply tank 4 are lower than the flash tank 9.
Preferably, in order to enable the liquid refrigerant to smoothly flow into the first air supply loop 2 under the action of gravity, the height from the lowest point of the shell of the flash device 9 to the ground is h6, the height from the lowest point of the shell of the liquid supplementing tank 3 to the ground is h2, and the height from the lowest point of the air supply tank 4 to the ground is h3, so that h6 > h2 > h3 is satisfied.
Considering that the liquid level possibly appearing in the condenser 8 and the flash evaporator 9 is unstable, a certain risk is generated for liquid supply, liquid level detection equipment can be additionally arranged in the condenser 8 and the flash evaporator 9, the liquid level in the liquid level detection equipment can be detected and fed back in real time, the problem that the air supply of the air suspension bearing is insufficient is prevented from being caused.
In all the embodiments of the present application, the liquid refrigerant flowing out from the liquid taking port enters the liquid supplementing tank 3, and is supplemented to the gas supplying tank 4 by the liquid supplementing tank 3, so as to avoid the overlarge pressure fluctuation of the gas supplying tank 4 during liquid supplementing, the volume of the liquid supplementing tank 3 is V1, the volume of the gas supplying tank 4 is V2, and V1 < V2 is satisfied. The volume and the pressure are inversely proportional, the influence of the same amount of refrigerant on the internal pressure in the liquid supplementing tank 3 is larger than that of the refrigerant in the gas supplying tank 4, and the refrigerant is gasified due to the temperature rise after entering the gas supplying tank 4, so that the pressure is increased, and the volume of the gas supplying tank 4 is larger so as to balance the pressure value.
In all the above embodiments of the present application, the gas supply tank 4 is preferably provided with heating means 10, the heating means 10 being turned on or off depending on the level, pressure in the gas supply tank 4. The lowest liquid level value of the liquid refrigerant in the air supply tank 4 is H0, the liquid level value of the liquid refrigerant in the air supply tank is H1, and the target liquid level value of the liquid refrigerant in the air supply tank is H2, wherein H2 is more than H1 and more than H0. H0 is the liquid level limiting the opening of the electric heater, and the electric heater must be ensured to be soaked by liquid refrigerant to be started. H1 is the liquid level of the replenishing liquid, and when the liquid level is reduced to H1, the liquid refrigerant in the gas supply tank is less, and the replenishing liquid is required to be controlled. H2 is a control of the highest liquid level of the gas supply tank, the liquid level in the gas supply tank cannot be higher than H2, and then the gas supply pipeline is arranged upwards, so that the liquid level is too high, and the liquid can possibly enter the third passage 15 and finally enter the gas suspension bearing, so that the performance of the gas suspension bearing is affected.
Preferably, in order to detect the liquid level and the pressure in the gas supply tank 4, the gas supply tank 4 is further provided with a liquid level sensor 11, a pressure sensor 12.
Preferably, the first gas supply circuit 2 comprises a first passage 13, a second passage 14, and a third passage 15, the first passage 13 being arranged between the liquid intake and the liquid replenishing tank 3, the second passage 14 being arranged between the liquid replenishing tank 3 and the gas supply tank 4, and the third passage 15 being arranged between the gas supply tank 4 and the gas suspension compressor 1. The first passage 13 is provided with a fourth regulating valve 16, the second passage 14 is provided with a third regulating valve 17, and the third passage 15 is provided with a fifth regulating valve 18 and a filter device 19. Therefore, the first air supply loop 2 controls the on-off of the first passage 13 through the fourth regulating valve 16, namely, controls the on-off of the liquid refrigerant conveyed from the liquid taking port to the liquid supplementing tank 3, controls the on-off of the second passage 14 through the third regulating valve 17, namely, controls the on-off of the liquid supplementing tank 3 to the air supplying tank 4, and controls the on-off of the third passage 15 through the fifth regulating valve 18, namely, controls the on-off of the air supplying tank 4 to the air suspension bearing.
Preferably, in order to ensure the normal transfusion of the liquid supplementing tank 3 and the liquid supplying tank 4, the refrigerant circulation loop is further provided with an adjusting air return port, the first air supplying loop 2 is further provided with a first bypass passage 20 and a second bypass passage 21, the first bypass passage 20 is arranged between the liquid supplementing tank 3 and the adjusting air return port, the second bypass passage 21 is arranged between the liquid supplying tank 4 and the liquid supplementing tank 3, the first bypass passage 20 is provided with a first adjusting valve 22, and the second bypass passage 21 is provided with a second adjusting valve 23. When the liquid-taking port conveys liquid refrigerant to the liquid-replenishing tank 3, the first regulating valve 22 is opened, and the first bypass passage 20 is communicated, so that the liquid refrigerant smoothly flows into the liquid-replenishing tank 3. When the liquid replenishing tank 3 is used for replenishing liquid to the air supply tank 4, the second regulating valve 23 is opened, the second bypass passage 21 is communicated, and the liquid refrigerant smoothly flows into the air supply tank 4.
Preferably, the position of the regulating return air port corresponds to the position of the liquid taking port, in the first embodiment, the liquid taking port is located in the liquid area of the evaporator 7, the regulating return air port is located in the gaseous area of the evaporator 7, in the second embodiment, the regulating return air port is located in the gaseous area of the condenser 8, and in the third embodiment, the regulating return air port is located in the gaseous area of the flash evaporator 9.
According to the gas suspension bearing gas supply system, according to the actual design condition of the unit, the liquid supplementing tank 3 can take liquid from different parts, the application applicability is better, the liquid supplementing tank, the gas supplying tank, the unit evaporator, the condenser and the flash generator are arranged at different heights, the gas supply to the gas suspension bearing is continuously and stably realized by orderly and flexibly adjusting all valves and utilizing the gravity and the communicating vessel principle, and the reliable and stable operation of the unit is ensured.
The operation process of the centrifugal chiller can be divided into four different states, namely (1) a starting process state, (2) a stopping process state, (3) a small pressure difference (condensing pressure minus evaporating pressure) between the condenser and the evaporator and (4) a large pressure difference (condensing pressure minus evaporating pressure) between the condenser and the evaporator.
In the state (1), the output of the compressor is insufficient, the pressure difference cannot be formed in the refrigerant circulation system, and the air suspension bearing normally operates and the air supply of an external system is required. In the state (2), after the motor of the unit is stopped, the air suspension bearing can idle for a period of time due to inertia, and the air supply system is required to supply air continuously until the bearing stops running. In state (3), although a pressure difference has been formed, the pressure difference is small, and the generated air supply pressure is insufficient to meet the normal demand of the air suspension bearing. In the state (4), enough pressure difference is formed in the refrigerant circulation system, and the pressure of the gaseous refrigerant in the condenser is enough to enable the gas suspension bearing to normally operate. Therefore, when the unit is in the states (1), (2) and (3), external air supply is needed by the first air supply loop 2, and when the unit is in the state (4), air supply can be completed only by the unit, so that the energy consumed for maintaining the air supply system is reduced.
The application also provides a gas supply method adopting the gas suspension bearing gas supply system, which comprises the following steps:
in the first working mode, when the gas suspension compressor 1 is in a starting stage and a shutdown stage, or the pressure difference between the condensing pressure and the evaporating pressure in the refrigerant circulation system is smaller than a preset value, namely, the state (1), the state (2) and the state (3) are corresponding, the liquid refrigerant enters the liquid supplementing tank 3 through the liquid taking port, and the gas supply tank 4 supplies gas to the gas suspension bearing in the gas suspension compressor 1.
Preferably, when the first air supply circuit 2 comprises a first passage 13, a second passage 14; the first bypass passage 20 is provided with a first regulating valve 22, the second bypass passage 21 is provided with a second regulating valve 23, the first passage 13 is provided with a fourth regulating valve 16, when the second passage 14 is provided with a third regulating valve 17, the first regulating valve 22 and the fourth regulating valve 16 are controlled to be opened, the second regulating valve 23 and the third regulating valve 17 are closed, and liquid refrigerant enters the liquid supplementing tank 3 through the liquid taking port;
with the consumption of the liquid refrigerant in the gas supply tank, the liquid refrigerant level can be continuously reduced, when the liquid refrigerant level in the gas supply tank 4 is smaller than H1, liquid supplementing is carried out, the first regulating valve 22 and the fourth regulating valve 16 are controlled to be closed, the second regulating valve 23 and the third regulating valve 17 are controlled to be opened, and the liquid refrigerant in the liquid supplementing tank 3 flows into the gas supply tank 4 by utilizing the gravity and a communicating vessel principle, so that the liquid refrigerant in the gas supply tank 4 is supplemented.
When the liquid supplementing is carried out, if the liquid supplementing time is set to be 10 seconds, the first regulating valve 22 and the fourth regulating valve 16 can be controlled to be opened, the second regulating valve 23 and the third regulating valve 17 are controlled to be closed, after the liquid supplementing lasts for 10 seconds, the first regulating valve 22 and the fourth regulating valve 16 are controlled to be closed, the second regulating valve 23 and the third regulating valve 17 are controlled to be opened, the liquid refrigerant at the liquid taking port can flow to the liquid supplementing tank 3 again, the liquid refrigerant in the liquid supplementing tank 3 can be filled again, so that the liquid supplementing tank 4 is supplemented for the next time, and a complete closed-loop liquid supplementing cycle is formed.
In the second working mode, when the pressure difference between the condensing pressure and the evaporating pressure in the refrigerant circulation system is greater than or equal to a preset value, namely, the state (4) is corresponding, the gaseous refrigerant in the condenser 8 in the refrigerant circulation system is adopted to supply air to the air suspension bearing.
Preferably, the first regulating valve 22 and the fourth regulating valve 16 are controlled to be opened, the second regulating valve 23 and the third regulating valve 17 are controlled to be closed, the heating device 10 is controlled to be closed, and the fifth regulating valve 18 is controlled to be opened according to the air supply demand of the compressor bearing.
When the heating device 10 is arranged in the air supply tank 4, when the liquid refrigerant level in the air supply tank 4 is more than or equal to H0, the heating device 10 is turned on, otherwise, the heating device 10 is turned off;
and/or when the pressure in the air supply tank 4 is less than P1, the heating device 10 is turned on; when the pressure P1 is less than or equal to the pressure P2 in the air supply tank 4, the heating device 10 keeps the current state; when the pressure in the air supply tank 4 is greater than P2, the heating device 10 is turned off.
In order to avoid frequent opening and closing of the heating device 10, it is assumed that the pressure in the gas supply tank 4 is gradually increased from a pressure lower than the pressure point P1, the heating device 10 is turned on when the pressure reaches the pressure point P1, and the heating device is turned off when the pressure continues to increase to the pressure point P2. After that, as the air supply is consumed, the pressure in the air supply tank 4 gradually decreases from the pressure point higher than the pressure point P2, and when the pressure is reduced to the pressure point P2, the heating device 10 is not immediately turned on, but as the pressure is further reduced to the pressure point P1, the heating device 10 is started again. Thereby ensuring that the operation of the heating device 10 is separated by the time when the pressure is reduced from P2 to P1, the heating device 10 is not frequently opened and closed, the service life of the heating device 10 is ensured, and energy sources can be saved.
A centrifugal water chilling unit adopts the air suspension bearing air supply system or the air supply method.
It will be readily appreciated by those skilled in the art that the above advantageous ways can be freely combined and superimposed without conflict.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention. The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present invention, and these modifications and variations should also be regarded as the scope of the invention.
Claims (15)
1. An air suspension bearing air supply system, comprising:
a gas suspension compressor (1) and a refrigerant circulation loop in which the gas suspension compressor is positioned;
the liquid inlet of the first air supply loop (2) is connected with the liquid taking port of the refrigerant circulation loop and is used for taking liquid from the liquid taking port, and the air outlet of the first air supply loop (2) is connected to the air suspension compressor (1);
the first air supply loop (2) comprises a liquid supplementing tank (3) and an air supply tank (4), the installation height of the liquid supplementing tank (3) and the air supply tank (4) is lower than that of the liquid taking port, and the refrigerant in the refrigerant circulation loop can flow into the first air supply loop (2) from the liquid taking port under the action of gravity; the refrigerant circulation loop comprises an evaporator (7), the liquid taking port is arranged in a liquid area of the evaporator (7), and the installation heights of the liquid supplementing tank (3) and the gas supplying tank (4) are lower than the evaporator (7); the air supply system further comprises a second air supply loop (5), the second air supply loop (5) is arranged between a condenser (8) of the refrigerant circulation loop and an air supply tank (4) in the first air supply loop (2), and a one-way valve (6) from the condenser (8) to the air supply tank (4) is arranged on the second air supply loop (5).
2. The air suspension bearing air supply system according to claim 1, wherein the height from the lowest point of the evaporator (7) shell to the ground is h1, the height from the lowest point of the liquid supplementing tank (3) shell to the ground is h2, the height from the lowest point of the air supply tank (4) to the ground is h3, and h1 > h2 > h3 is satisfied.
3. The gas suspension bearing gas supply system according to any one of claims 1-2, characterized in that the volume of the liquid replenishing tank (3) is V1, and the volume of the gas supply tank (4) is V2, satisfying V1 < V2.
4. An air suspension bearing air supply system according to any of claims 1-2, characterized in that the air supply tank (4) is provided with heating means (10), which heating means (10) are turned on or off in dependence of the liquid level, pressure in the air supply tank (4).
5. The gas suspension bearing gas supply system according to claim 4, characterized in that the gas supply tank (4) is further provided with a liquid level sensor (11), a pressure sensor (12).
6. An air suspension bearing air supply system according to any one of claims 1-2, characterized in that the first air supply circuit (2) comprises a first passage (13), a second passage (14) and a third passage (15), the first passage (13) being arranged between the liquid taking port and the liquid supplementing tank (3), the second passage (14) being arranged between the liquid supplementing tank (3) and the air supply tank (4), the third passage (15) being arranged between the air supply tank (4) and the air suspension compressor (1).
7. An air suspension bearing air supply system according to claim 6, characterized in that the first passage (13) is provided with a fourth regulating valve (16), the second passage (14) is provided with a third regulating valve (17), and the third passage (15) is provided with a fifth regulating valve (18).
8. The gas suspension bearing gas supply system according to claim 7, characterized in that the refrigerant circulation circuit is further provided with an adjusting gas return port, the first gas supply circuit (2) is further provided with a first bypass passage (20), a second bypass passage (21), the first bypass passage (20) is arranged between the liquid replenishing tank (3) and the adjusting gas return port, and the second bypass passage (21) is arranged between the gas supply tank (4) and the liquid replenishing tank (3).
9. An air suspension bearing air supply system according to claim 8, characterized in that the first bypass (20) is provided with a first regulating valve (22) and the second bypass (21) is provided with a second regulating valve (23).
10. A gas supply method using the gas suspension bearing gas supply system as claimed in any one of claims 1 to 9, comprising:
when the gas suspension compressor (1) is in a start-up stage and a shutdown stage or the pressure difference between the condensing pressure and the evaporating pressure in the refrigerant circulation system is smaller than a preset value, the liquid refrigerant enters the liquid supplementing tank (3) through the liquid taking port, and the gas supplying tank (4) supplies gas to the gas suspension bearing in the gas suspension compressor (1).
11. The method for supplying air to an air suspension bearing according to claim 10, wherein when a pressure difference between a condensing pressure and an evaporating pressure in the refrigerant circulation system is equal to or greater than a preset value, the air suspension bearing is supplied with air by using a gaseous refrigerant in a condenser (8) in the refrigerant circulation system.
12. The gas supply method of the gas suspension bearing gas supply system according to claim 10, characterized in that when the first gas supply circuit (2) comprises a first passage (13) and a second passage (14), the first passage (13) is provided with a fourth regulating valve (16), the refrigerant circulation circuit is further provided with a regulating return port, and the first gas supply circuit (2) is further provided with a first bypass passage (20) and a second bypass passage (21); the first bypass passage (20) is provided with a first regulating valve (22), the second bypass passage (21) is provided with a second regulating valve (23), the first bypass passage (13) is provided with a fourth regulating valve (16), and when the second bypass passage (14) is provided with a third regulating valve (17):
the first regulating valve (22) and the fourth regulating valve (16) are controlled to be opened, the second regulating valve (23) and the third regulating valve (17) are controlled to be closed, and liquid refrigerant enters the liquid supplementing tank (3) through the liquid taking port;
when the liquid level of the liquid refrigerant in the gas supply tank (4) is less than H1, liquid supplementing is carried out, the first regulating valve (22) and the fourth regulating valve (16) are controlled to be closed, the second regulating valve (23) and the third regulating valve (17) are controlled to be opened, and the liquid refrigerant flows into the gas supply tank (4) from the liquid supplementing tank (3).
13. The gas supply method of the gas suspension bearing gas supply system according to claim 12, wherein when the gas supply tank (4) is replenished with liquid, the first regulating valve (22) and the fourth regulating valve (16) are controlled to be opened, and the second regulating valve (23) and the third regulating valve (17) are controlled to be closed after a preset time.
14. The gas supply method of the gas suspension bearing gas supply system according to claim 10, characterized in that when the gas supply tank (4) is provided with a heating device (10),
when the liquid refrigerant level in the gas supply tank (4) is more than or equal to H0, the heating device (10) is turned on, otherwise, the heating device (10) is turned off;
and/or when the pressure in the air supply tank (4) is less than P1, the heating device (10) is started; when the pressure in the P1 is less than or equal to the pressure in the air supply tank (4) is less than or equal to P2, the heating device (10) keeps the current state; when the pressure in the air supply tank (4) is more than P2, the heating device (10) is closed.
15. A centrifugal chiller, wherein the air supply system of any one of claims 1-9 or the air supply method of any one of claims 10-14 is used.
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| CN202010641383.6A CN111780443B (en) | 2020-07-06 | 2020-07-06 | Air suspension bearing air supply system, air supply method and centrifugal water chilling unit |
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| CN202010641383.6A CN111780443B (en) | 2020-07-06 | 2020-07-06 | Air suspension bearing air supply system, air supply method and centrifugal water chilling unit |
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Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113847345B (en) * | 2021-09-08 | 2024-02-23 | 青岛海尔空调电子有限公司 | Air supply system and refrigerating system for suspension bearing |
| CN113959122B (en) * | 2021-09-16 | 2023-03-31 | 青岛海尔空调电子有限公司 | Refrigeration system, control method and control device for refrigeration system |
| CN113959127B (en) * | 2021-09-16 | 2023-06-16 | 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 |
| CN113959116A (en) * | 2021-09-27 | 2022-01-21 | 青岛海尔空调电子有限公司 | Compressor bearing air supply system and air suspension compressor system |
| CN113959106B (en) * | 2021-10-29 | 2023-04-25 | 青岛海尔空调电子有限公司 | Method and device for controlling refrigerant circulation system and refrigerant circulation system |
| CN113970197B (en) * | 2021-10-29 | 2023-03-31 | 青岛海尔空调电子有限公司 | Control method and device for air supply system, refrigeration equipment and storage medium |
| 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 |
| CN114198925B (en) * | 2021-11-22 | 2024-02-23 | 青岛海尔空调电子有限公司 | Gas-liquid supply system of compressor |
| CN114198944B (en) * | 2021-11-22 | 2023-03-28 | 青岛海尔空调电子有限公司 | Compressor and liquid supply system of compressor |
| CN114198926B (en) * | 2021-11-22 | 2023-09-26 | 青岛海尔空调电子有限公司 | Air supply system of compressor and control method for the same |
| CN114198919B (en) * | 2021-11-22 | 2023-11-24 | 青岛海尔空调电子有限公司 | Air suspension unit system |
| CN114198949B (en) * | 2021-11-22 | 2023-10-20 | 青岛海尔空调电子有限公司 | Liquid supply system of compressor |
| CN114198924B (en) * | 2021-11-22 | 2023-07-18 | 青岛海尔空调电子有限公司 | Air supply system and refrigerant circulation system for air suspension compressor |
| CN115306674B (en) * | 2022-06-14 | 2023-07-25 | 浙江福腾流体科技有限公司 | Liquid supply system for static pressure air bearing and control method thereof |
| CN115247905B (en) * | 2022-08-31 | 2024-06-28 | 珠海格力电器股份有限公司 | Refrigerant circulation system, air conditioning equipment and control method of refrigerant circulation system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110425176A (en) * | 2019-07-30 | 2019-11-08 | 青岛科技大学 | The centrifugal compressor air supply system of gas bearing support |
| CN210165500U (en) * | 2019-06-10 | 2020-03-20 | 克莱门特捷联制冷设备(上海)有限公司 | Compound air conditioning system for data center |
| CN210345951U (en) * | 2019-06-13 | 2020-04-17 | 上海中金能源投资有限公司 | Gas suspension heat pump unit |
| CN111365874A (en) * | 2018-12-25 | 2020-07-03 | 珠海格力电器股份有限公司 | Refrigerant circulating system |
| CN212299520U (en) * | 2020-07-06 | 2021-01-05 | 珠海格力电器股份有限公司 | Air suspension bearing air supply system and centrifugal water chilling unit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004044954A (en) * | 2002-07-12 | 2004-02-12 | Mitsubishi Heavy Ind Ltd | Turbo refrigerating machine comprising compressor with gas bearing and its operating method |
-
2020
- 2020-07-06 CN CN202010641383.6A patent/CN111780443B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111365874A (en) * | 2018-12-25 | 2020-07-03 | 珠海格力电器股份有限公司 | Refrigerant circulating system |
| CN210165500U (en) * | 2019-06-10 | 2020-03-20 | 克莱门特捷联制冷设备(上海)有限公司 | Compound air conditioning system for data center |
| CN210345951U (en) * | 2019-06-13 | 2020-04-17 | 上海中金能源投资有限公司 | Gas suspension heat pump unit |
| CN110425176A (en) * | 2019-07-30 | 2019-11-08 | 青岛科技大学 | The centrifugal compressor air supply system of gas bearing support |
| CN212299520U (en) * | 2020-07-06 | 2021-01-05 | 珠海格力电器股份有限公司 | Air suspension bearing air supply system and centrifugal water chilling unit |
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