CN113790550A - Refrigeration circulating system - Google Patents
Refrigeration circulating system Download PDFInfo
- Publication number
- CN113790550A CN113790550A CN202010455541.9A CN202010455541A CN113790550A CN 113790550 A CN113790550 A CN 113790550A CN 202010455541 A CN202010455541 A CN 202010455541A CN 113790550 A CN113790550 A CN 113790550A
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- China
- Prior art keywords
- compressor
- gas
- lubricating
- refrigeration cycle
- refrigerant
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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
- F25B31/00—Compressor arrangements
- F25B31/002—Lubrication
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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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/07—Details of compressors or related parts
- F25B2400/074—Details of compressors or related parts with multiple cylinders
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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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/07—Details of compressors or related parts
- F25B2400/075—Details of compressors or related parts with parallel compressors
- F25B2400/0751—Details of compressors or related parts with parallel compressors the compressors having different capacities
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Magnetic Bearings And Hydrostatic Bearings (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention provides a refrigeration cycle system. The refrigeration cycle system includes: a first compressor configured to suck and compress a refrigerant of a low-pressure side member in a refrigeration cycle and discharge the compressed refrigerant, and including a gas bearing configured to support a rotor of the compressor by using a lubricating gas supplied from the lubricating gas inlet; and the air supply pipeline is connected between the low-pressure side component and the lubricating gas inlet and is used for supplying part of refrigerant gas in the low-pressure side component to the lubricating gas inlet to be used as lubricating gas. The refrigeration cycle system is provided with the air supply pipeline independently, and the air supply pipeline is used for providing the lubricating gas for lubricating the air suspension bearing independently, so that the problem that the air suspension bearing centrifugal compressor in the prior art is slow to start is solved. And the air supply pipeline obtains the lubricating air from the low-pressure side part of the system, so that the energy consumption required for supplying the air suspension bearing is reduced.
Description
Technical Field
The invention relates to the field of compressors, in particular to a refrigeration cycle system.
Background
In the static pressure gas bearing, the friction resistance between the gas and the rotor is small, and a complicated control system is not required as compared with a magnetic levitation bearing, and the static pressure gas bearing has a simple structure and low cost, and thus has recently been applied to a centrifugal compressor. Because the static pressure gas bearing adopts an external gas supply mode to provide the suspension pressure, the reasonable design of a gas supply system is particularly important for ensuring the static pressure gas bearing to work stably.
In the existing gas supply scheme, one is to utilize a liquid pump to pump out a liquid refrigerant from a condenser, then the liquid refrigerant passes through a throttling device and a gas-liquid separator and then is led to a static pressure gas bearing, the whole system has a relatively complex structure, and the effective energy loss is large due to the throttling process; the second scheme is to heat and evaporate liquid refrigerant and then convey gaseous refrigerant to the static pressure gas bearing, and this scheme will result in high energy consumption of gas supply and discontinuous gas supply, which affects the stability of static pressure gas bearing.
Disclosure of Invention
An object of the present invention is to provide a refrigeration cycle system capable of solving at least the problems of any of the above aspects.
A further object of the present invention is to solve the problem of slow start-up of an air bearing compressor.
Another further object of the present invention is to solve the problem of excessive energy consumption of air supply for air suspension bearings.
Another further object of the present invention is to solve the problem of unstable air supply pressure of an air suspension bearing.
Particularly, the present invention provides a refrigeration cycle system, comprising a first compressor configured to suck and compress a refrigerant of a low-pressure side member in a refrigeration cycle and discharge the compressed refrigerant, wherein the first compressor comprises an air bearing and a lubricating gas inlet, the air bearing is configured to support a rotor of the compressor by using the lubricating gas provided by the lubricating gas inlet; and the air supply pipeline is connected between the low-pressure side component and the lubricating gas inlet and is used for supplying part of refrigerant gas in the low-pressure side component to the lubricating gas inlet to be used as lubricating gas.
Further, the low-pressure side member includes an evaporator including: the first refrigerant outlet is connected with the first compressor and used for supplying refrigerant to the first compressor; and the second refrigerant outlet is connected with the air supply pipeline and used for supplying lubricating gas.
Furthermore, the refrigeration cycle system also comprises a second compressor which is arranged in the air supply pipeline and is used for compressing the lubricating gas supplied from the second refrigerant outlet.
Further, the second compressor is an oil-free compressor.
Further, the second compressor is an air flotation compressor or a magnetic levitation compressor.
Further, the refrigeration cycle system further includes a pressure stabilizer disposed between the second compressor and the lubricant gas inlet for stabilizing a pressure of the lubricant gas flowing from the second compressor to the first compressor.
Furthermore, the refrigeration cycle system further comprises a filter which is arranged between the second compressor and the second refrigerant outlet and is used for filtering the lubricating gas flowing from the evaporator to the second compressor.
Furthermore, the refrigeration cycle system further comprises a one-way valve arranged between the second compressor and the pressure stabilizing device and used for enabling the lubricating gas to flow from the second compressor to the pressure stabilizing device in a one-way mode.
Further, the first compressor is a centrifugal compressor and comprises a first compression cavity and a second compression cavity; the first compression cavity and the second compression cavity are connected with the gas supply pipeline through lubricating gas access ports respectively.
Further, the gas suspension bearing is a static pressure gas bearing.
The first compressor in the refrigeration cycle system provided by the invention is a compression power source of the refrigeration cycle system and provides power for the flowing of a refrigerant. An air bearing is used to support the rotor within the first compressor. The air suspension bearing is provided with a lubricating air inlet connected with an air supply pipeline. The air supply pipeline is arranged between a low-pressure side component of the refrigeration cycle system and a lubricating air access port of the air suspension bearing and provides lubricating air to the air suspension bearing. Compared with the mode that part of sucked refrigerant is used for lubricating the air suspension bearing in the prior art, the refrigeration cycle system is provided with the air supply pipeline independently, and the air supply pipeline is used for providing lubricating gas for lubricating the air suspension bearing independently, so that the problem that the centrifugal compressor of the air suspension bearing in the prior art is slow to start is solved.
Further, the low-pressure side member includes an evaporator including: the first refrigerant outlet is connected with the first compressor and used for supplying refrigerant to the first compressor; and the second refrigerant outlet is connected with the air supply pipeline and used for supplying the lubricating gas. The evaporator serves as a low-pressure side device of the refrigeration cycle system on one hand, and provides lubricating gas to the gas supply pipeline by utilizing the second refrigerant outlet on the other hand. The energy consumption required for supplying the gas suspension bearing is also reduced due to the fact that the lubricating gas is directly obtained from the evaporator.
Further, a second compressor disposed in the gas supply line for compressing the lubricating gas supplied from the second refrigerant outlet; and the pressure stabilizing device is arranged between the second compressor and the lubricating gas inlet and is used for stabilizing the pressure of the lubricating gas flowing from the second compressor to the first compressor. The pressure stabilizer solves the problem that the air supply pressure of the air suspension bearing is unstable, so that the air suspension bearing can work better and continuously.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
fig. 1 is a schematic view of a refrigeration cycle system according to an embodiment of the present invention;
fig. 2 is a schematic view of an air supply line of a refrigeration cycle system according to an embodiment of the present invention.
Detailed Description
Fig. 1 is a schematic view of a refrigeration cycle system according to an embodiment of the present invention.
Referring to fig. 1, in some embodiments, the refrigerant circulation system includes: a first compressor 10, an evaporator 20, a condenser 30, an expansion valve 40, and an air supply line 100. The first compressor 10 sucks a gaseous refrigerant in the evaporator 20, compresses the gaseous refrigerant into a high-temperature high-pressure state, inputs the gaseous refrigerant into the condenser 30, condenses the high-temperature high-pressure refrigerant by the condenser 30 to convert the high-temperature high-pressure refrigerant into a high-temperature high-pressure liquid refrigerant, releases the pressure by the expansion valve 40 to obtain a low-temperature low-pressure liquid refrigerant, enters the evaporator 20, absorbs heat by the evaporator 20 to evaporate the gaseous refrigerant into a low-temperature low-pressure gaseous refrigerant, and returns to the first compressor 10 again to perform the next refrigeration cycle.
In some embodiments, the first compressor 10 includes an air bearing (not shown) configured to support the rotor of the compressor in a levitated state. The air suspension bearing is a static pressure air bearing, can be used as a radial air bearing, and can also be used as a thrust bearing.
The first compressor 10 may be a centrifugal compressor and includes two stages of compression chambers. The first compressor 10 is provided with an air bearing inside, and a lubricating gas inlet 101 connectable to the air bearing outside. The lubricating gas inlet 101 is used for connecting the gas supply pipeline 100 to obtain the lubricating gas supplied to the gas suspension bearing. In other embodiments, first compressor 10 may also be other types of compressors, such as a screw compressor, a scroll compressor, or the like.
The gas supply line 100 is connected between the low-pressure side part of the refrigeration cycle and the lubricating gas inlet 101, and is configured to supply a part of the refrigerant gas in the low-pressure side part of the refrigeration cycle to the lubricating gas inlet 101 as the lubricating gas. The air supply line 100 is particularly provided for the air bearing alone, so as to avoid the problem that the first compressor 10 is slow to start due to the fact that the sucked refrigerant needs to be simultaneously supplied to the air bearing for lubrication and the refrigeration cycle when the first compressor 10 starts.
The low-pressure side member of the refrigeration cycle in the present embodiment refers to a member on the side where the refrigerant pressure is low, and may be understood as a device upstream in the refrigerant flow direction of the first compressor 10. The low-pressure side member may include an evaporator 20, the evaporator 20 including a first refrigerant outlet 202, a second refrigerant outlet 204, and a lubrication gas return port 203. A first refrigerant outlet 202 connected to the first compressor 10 for supplying a refrigerant to the first compressor 10; the second refrigerant outlet 204 is connected to the air supply line 100 for supplying the lubricating gas. Since the lubricating gas is taken from the low-pressure side part of the refrigeration cycle system and supplied to the gas suspension bearing, the energy loss is reduced.
The first compressor 10 sucks a gaseous refrigerant from the evaporator 20 through the first refrigerant outlet 202, compresses the gaseous refrigerant and supplies the compressed gaseous refrigerant to the condenser 30, condenses the gaseous refrigerant into a high-pressure liquid refrigerant through the condenser 30, and then enters the expansion valve 40 to reduce the pressure, and then returns to the evaporator 20. The process is the main refrigeration cycle.
An air supply line 100 is additionally provided on the basis of the main refrigeration cycle. Part of the refrigerant in the evaporator 20 enters the air supply line 100 through the second refrigerant outlet 204, and enters the first compressor 10 through the lubricating gas inlet 101 to serve as the lubricating gas for the air bearing.
Fig. 2 is a schematic view of an air supply line of a refrigeration cycle system according to an embodiment of the present invention. Referring to fig. 2, main constituent components of the air supply line 100 in some embodiments are a first compressor 10, an evaporator 20, a filter 130, a second compressor 140, a check valve 150, and a pressure stabilizer 160 in this order.
The first compressor 10 is a centrifugal compressor and includes two stages of compression chambers, a first compression chamber 110 and a second compression chamber 120, respectively. First compression chamber 110 is inside including gas suspension bearing (not shown in the figure), and is provided with first lubricated gas access port 111, and second compression chamber 120 also includes gas suspension bearing (not shown in the figure), and is provided with second lubricated gas access port 121, and first lubricated gas access port 111 all belongs to lubricated gas access port 101 with second lubricated gas access port 121, inserts air supply line 100 to it is the gas suspension bearing air feed in first compression chamber 110 and the second compression chamber 120 respectively to acquire lubricated gas.
The second compressor 140 is disposed in the gas supply line 100 and is configured to compress the lubricating gas supplied from the second refrigerant outlet 204. The second compressor 140 may be a small-flow compressor with a smaller flow rate than the first compressor 10, and the second compressor 140 is an oil-free compressor, such as an air flotation compressor or a magnetic levitation compressor. The second compressor 140 is an oil-free compressor to prevent the refrigerant from being contaminated by the lubricating oil. In other embodiments, the second compressor 140 may draw refrigerant from multiple locations on the low-pressure side of the main refrigeration circuit.
The filter 130 is disposed between the second compressor 140 and the second refrigerant outlet 204, and is used for filtering the lubricating gas flowing from the evaporator 20 to the second compressor 140.
The pressure stabilizer 160 is disposed between the second compressor 140 and the lubricating gas inlet 106, and is used for stabilizing the pressure of the lubricating gas flowing from the second compressor 140 to the first compressor 10, so as to solve the problem of unstable gas pressure when the gas suspension bearing supplies gas.
The check valve 150 is disposed between the second compressor 140 and the pressure stabilizer 160, and allows the lubricating gas to flow in one direction from the second compressor 140 to the pressure stabilizer 160.
As shown in fig. 2, in some embodiments, the second compressor 140 in the gas supply line 100 draws a portion of the refrigerant from the evaporator 20, which portion of the refrigerant serves as a lubricating gas supply for the gas suspension bearings. The lubricating gas is filtered by the filter 130 and then enters the second compressor 140, and the filter 130 prevents a part of liquid refrigerant from entering the second compressor 140 to damage the second compressor 140. Part of the refrigerant pressurized by the second compressor 140 enters the pressure stabilizer 160 through the check valve 150. The check valve 150 is provided to prevent the refrigerant from flowing back into the second compressor 140 due to the difference in line pressure. After the pressure stabilizer 160 stabilizes the lubrication gas, the pressure of the lubrication gas is kept stable and then the lubrication gas is input into the first lubrication gas input port 111 and the second lubrication gas input port 121 to supply the air suspension bearings in the first compression chamber 110 and the second compression chamber 120, so that the smooth operation of the air suspension bearings in the first compression chamber 110 and the second compression chamber 120 is ensured. The lubricating gas having completed the lubricating task returns to the evaporator 20 through the lubricating gas outlet 104, and completes the refrigerant circulation in the gas supply line 100. The slow start of the first compressor 10 is solved by providing the air supply line 100 to supply air to the air bearing in the first compressor 10. The gas is taken from the evaporator 20, which reduces the energy consumption for supplying gas to the gas suspension bearing. The filter 130 is disposed to remove the liquid refrigerant, so as to prevent the liquid refrigerant from entering the second compressor 140 and damaging the second compressor 140. The second compressor 140 is configured as an oil-free compressor to prevent the lubricating oil from contaminating the refrigerant. The pressure stabilizer 160 is arranged to solve the problem of unstable air supply pressure of the air suspension bearing, so that the air suspension bearing can stably work for a long time.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (10)
1. A refrigeration cycle system comprising:
a first compressor configured to suck and compress a refrigerant of a low-pressure side member in a refrigeration cycle and discharge the compressed refrigerant, and including a gas bearing configured to support a rotor of the compressor with a lubricating gas supplied from a lubricating gas inlet, and the lubricating gas inlet;
and a gas supply line connected between the low-pressure side member and the lubricating gas inlet, and configured to supply a part of the refrigerant gas in the low-pressure side member to the lubricating gas inlet as the lubricating gas.
2. The refrigeration cycle system of claim 1, wherein the low-pressure side component comprises:
an evaporator, comprising:
the first refrigerant outlet is connected with the first compressor and used for supplying refrigerant to the first compressor;
and the second refrigerant outlet is connected with the air supply pipeline and used for supplying the lubricating gas.
3. The refrigeration cycle system according to claim 2, further comprising:
and the second compressor is arranged in the air supply pipeline and is used for compressing the lubricating gas supplied from the second refrigerant outlet.
4. The refrigeration cycle system according to claim 3, wherein the second compressor is an oil-free compressor.
5. The refrigeration cycle system of claim 4, wherein the second compressor is an air compressor or a magnetic levitation compressor.
6. The refrigeration cycle system according to claim 3, further comprising:
and the pressure stabilizing device is arranged between the second compressor and the lubricating gas inlet and is used for stabilizing the pressure of the lubricating gas flowing from the second compressor to the first compressor.
7. The refrigeration cycle system according to claim 3, further comprising:
and the filter is arranged between the second compressor and the second refrigerant outlet and is used for filtering the lubricating gas flowing from the evaporator to the second compressor.
8. The refrigeration cycle system according to claim 6, wherein
And the one-way valve is arranged between the second compressor and the pressure stabilizing device and is used for enabling the lubricating gas to flow from the second compressor to the pressure stabilizing device in a one-way mode.
9. The refrigeration cycle system according to claim 1, wherein,
the first compressor is a centrifugal compressor and comprises a first compression cavity and a second compression cavity;
the first compression cavity and the second compression cavity are respectively connected with the gas supply pipeline through the lubricating gas access port.
10. The refrigeration cycle system of claim 1, wherein the gas suspension bearing is a hydrostatic gas bearing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010455541.9A CN113790550A (en) | 2020-05-26 | 2020-05-26 | Refrigeration circulating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010455541.9A CN113790550A (en) | 2020-05-26 | 2020-05-26 | Refrigeration circulating system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113790550A true CN113790550A (en) | 2021-12-14 |
Family
ID=79180965
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010455541.9A Pending CN113790550A (en) | 2020-05-26 | 2020-05-26 | Refrigeration circulating system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113790550A (en) |
-
2020
- 2020-05-26 CN CN202010455541.9A patent/CN113790550A/en active Pending
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