CN112944733B - Compressor system and air conditioning unit - Google Patents
Compressor system and air conditioning unit Download PDFInfo
- Publication number
- CN112944733B CN112944733B CN201911260853.8A CN201911260853A CN112944733B CN 112944733 B CN112944733 B CN 112944733B CN 201911260853 A CN201911260853 A CN 201911260853A CN 112944733 B CN112944733 B CN 112944733B
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- compressor
- motor
- cooling
- cooling medium
- motor shaft
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 16
- 238000001816 cooling Methods 0.000 claims abstract description 41
- 239000002826 coolant Substances 0.000 claims abstract description 23
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 230000007774 longterm Effects 0.000 abstract description 5
- 239000002918 waste heat Substances 0.000 description 18
- 239000003507 refrigerant Substances 0.000 description 13
- 238000001704 evaporation Methods 0.000 description 7
- 238000005057 refrigeration Methods 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000005265 energy consumption Methods 0.000 description 5
- 230000008020 evaporation Effects 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 239000002699 waste material Substances 0.000 description 5
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000012946 outsourcing Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000008235 industrial water Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 235000011121 sodium hydroxide Nutrition 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- 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
- F25B31/006—Cooling of compressor or motor
-
- 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
- F25B31/02—Compressor arrangements of motor-compressor units
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The application provides a compressor system and an air conditioning unit, the compressor system includes a motor, a primary compressor, a secondary compressor, and a condenser. The motor comprises a motor body and a motor shaft extending out of the motor body, wherein the main compressor is in driving connection with the motor shaft and used for compressing cooling medium for refrigerating or heating, and the auxiliary compressor is in driving connection with the motor shaft. The condenser is connected with the exhaust end of the auxiliary compressor through a first cooling medium pipeline, the condenser is connected with the cooling flow passage of the motor main body through a second cooling medium pipeline, the cooling flow passage of the motor main body is connected with the air suction end of the auxiliary compressor through a third cooling medium pipeline, and the throttling device is arranged on the second cooling medium pipeline. By applying the technical scheme of the application, the cooling circulation system special for the motor is used for cooling the motor in a targeted manner, so that the temperature of the motor is effectively reduced, and the long-term reliable operation of the compressor system is ensured.
Description
Technical Field
The invention relates to the technical field of refrigeration equipment, in particular to a compressor system and an air conditioning unit.
Background
With the rapid development and growth of global economy and population, the energy demand is larger and larger, the primary energy exploitation amount of coal, petroleum, natural gas and the like is also increased, so that the reserve amount of the non-renewable energy is reduced year by year, and the energy crisis problem is increasingly prominent. In order to solve the energy crisis problem, not only the development and the utilization of new energy are quickened, but also the energy waste problem is solved from the energy consumption condition of China. The chemical industry, metallurgy, electric power and the like are large consumers of primary energy consumption, the energy waste form is mainly represented by a large amount of waste heat resource emission, and according to statistics, the waste heat resource emitted in the industrial production process accounts for about 17% -67% of the total fuel consumption, and in 7 industrial industries such as steel, caustic soda, cement and the like, the waste heat resource can account for 1/3 of the total energy consumption. According to the temperature of waste heat resources, the waste heat sources are generally divided into high-temperature waste heat above 600 ℃, medium-temperature waste heat between 300 and 600 ℃ and low-temperature waste heat below 300 ℃, and the sources of the waste heat can be divided into flue gas waste heat, waste water waste gas waste heat and cooling medium waste heat, and investigation shows that the low-temperature waste heat resources below 200 ℃ in different waste heat resources can occupy 60 percent. Therefore, in order to overcome the energy waste and solve the energy crisis problem, effective and reasonable waste heat recovery measures are required to be sought for different waste heat resources, the energy consumption of the original process flow is reduced, and new production equipment and device with high energy utilization rate are developed on the basis of the original process flow.
Most of industrial water vapor is boiler vapor, and besides power generation by using high-temperature and high-pressure vapor in a power plant, the water vapor is mainly used in an evaporation concentration system, and evaporation concentration is a very common link in industry and is widely applied to various industrial production such as food, pharmacy, chlor-alkali, sea water desalination, sewage treatment and the like. In a medium-and small-sized evaporation concentration system, an electric boiler is mostly used for generating steam, the temperature of the steam is generally in the range of 110-150 ℃ and can reach 200 ℃, and waste steam after passing through an evaporator needs to be condensed by a condenser and then returns to the boiler. In a large-scale system, the steam demand is large, the cost for generating steam by using the electric boiler is high, the steam is usually used for heating through outsourcing steam, the temperature and the pressure of the outsourcing steam are high, and waste steam generated after passing through the evaporator is generally directly discharged under the condition that the electric boiler is not used. Along with the rapid rising of energy-saving and environment-friendly requirements and steam prices, the energy consumption in the evaporation and concentration process is a rapid increase of the cost burden of a wide-spread enterprise, and how to save the steam cost and improve the heat supply efficiency is the most urgent concern of the current industry using evaporation and concentration.
The mechanical vapor recompression (MECHANICAL VAPOUR RECOMPRESSION, MVR) system is a vapor heat pump system, and the principle of the mechanical vapor recompression (MECHANICAL VAPOUR RECOMPRESSION, MVR) system is that low-temperature and low-pressure vapor is compressed by a mechanical compressor, so that the temperature, pressure and specific enthalpy of the vapor are improved, and heat is released by condensation in a condenser to be used as a high-grade heat source. The low-temperature steam is heated and boosted by the compressor and then enters the evaporating/condensing tube of the evaporator/condenser to be condensed, the released raw material liquid at the outer evaporating side of the latent heat heating tube enters the separator, the separated low-temperature steam is used for sucking steam by the compressor, the concentrated solution is discharged from the bottom, and the waste heat of the condensed water can be used for waste heat of the raw material liquid.
In engineering, a centrifugal compressor is commonly used as a vapor compressor, belongs to a speed type compressor, firstly increases the vapor speed through impeller rotation, then converts the vapor speed energy into pressure energy through a diffuser, increases the pressure of the pressure energy, and is suitable for occasions with low pressure ratio and large volume flow because of higher rotating speed. Since centrifugal compressors are speed compressors, the overall system rotational speed is very high. In the compressor, the heat generation amount of the high-speed motor is quite large.
The existing centrifugal compressor system has insufficient cooling effect on a motor, a bearing and the like in the compressor, and the long-term reliable operation of the compressor cannot be guaranteed.
Disclosure of Invention
The embodiment of the invention provides a compressor system and an air conditioning unit, which are used for solving the technical problem that the compressor system in the prior art has insufficient cooling effect on a high-speed motor.
An embodiment of the present application provides a compressor system including: the motor comprises a motor main body and a motor shaft extending from the motor main body; the main compressor is in driving connection with the motor shaft and is used for compressing a cooling medium for refrigeration or heating; the auxiliary compressor is in driving connection with the motor shaft; the condenser is connected with the exhaust end of the auxiliary compressor through a first cooling medium pipeline, the condenser is connected with the cooling flow passage of the motor main body through a second cooling medium pipeline, and the cooling flow passage of the motor main body is connected with the air suction end of the auxiliary compressor through a third cooling medium pipeline; and the throttling device is arranged on the second cooling medium pipeline.
In one embodiment, the motor shaft extends from each of the two ends of the motor body, the primary compressor is located on a first side of the motor body and connected to the first end of the motor shaft, and the secondary compressor is located on a second side of the motor body and connected to the second end of the motor shaft.
In one embodiment, the secondary compressor is connected to the motor shaft by a gear pair.
In one embodiment, the gear pair is a step-up gear pair.
In one embodiment, the primary compressor is a first centrifugal compressor.
In one embodiment, the secondary compressor is a second centrifugal compressor.
In one embodiment, the restriction device is an expansion valve.
The application also provides an air conditioning unit which comprises a compressor system, wherein the compressor system is the compressor system.
In one embodiment, the air conditioning unit is a steam air conditioning unit.
In the above embodiment, after the main compressor is driven by the motor to participate in compressing the cooling medium for refrigeration or heating, the auxiliary compressor is driven by the motor to work, so that the auxiliary compressor, the condenser, the throttling device and the cooling flow passage of the motor main body form a cooling circulation system, and the cooling circulation system exclusive to the motor is used for carrying out targeted cooling on the motor, thereby effectively reducing the temperature of the motor and ensuring the long-term reliable operation of the compressor system. By adopting the technical scheme of the invention, the problems that in a compressor system, the heating value of a motor is large, and parts such as the motor and a bearing are easy to damage and lose efficacy due to temperature rise are effectively solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
fig. 1 is a schematic overall structure of an embodiment of a compressor system according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments and the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent. The exemplary embodiments of the present invention and the descriptions thereof are used herein to explain the present invention, but are not intended to limit the invention.
Aiming at the problem that the effect of cooling a motor, a bearing and the like by a compressor system in the prior art is insufficient, the invention also provides an embodiment of the compressor system capable of effectively cooling the motor. As shown in fig. 1, the compressor system includes a motor 10, a primary compressor 20, a secondary compressor 30, and a condenser 40. The motor 10 includes a motor body 11 and a motor shaft 12 extending from the motor body 11, a main compressor 20 is drivingly connected to the motor shaft 12, the main compressor 20 is used for compressing a cooling medium for cooling or heating, and a sub-compressor 30 is drivingly connected to the motor shaft 12. The condenser 40 is connected to the discharge end of the sub-compressor 30 through a first cooling medium line, the condenser 40 is connected to the cooling flow passage of the motor main body 11 through a second cooling medium line, the cooling flow passage of the motor main body 11 is connected to the suction end of the sub-compressor 30 through a third cooling medium line, and the throttle device 50 is provided on the second cooling medium line.
By applying the technical scheme of the invention, after the motor 10 drives the main compressor 20 to participate in compressing a cooling medium for refrigerating or heating, the motor 10 drives the auxiliary compressor 30 to work, so that the auxiliary compressor 30, the condenser 40, the throttling device 50 and a cooling flow passage of the motor main body 11 form a cooling circulation system, and the cooling circulation system special for the motor 10 is used for cooling the motor 10 in a targeted manner, thereby effectively reducing the temperature of the motor 10 and ensuring the long-term reliable operation of the compressor system. By adopting the technical scheme of the invention, the problems that in a compressor system, the heating value of a motor is large, and parts such as the motor and a bearing are easy to damage and lose efficacy due to temperature rise are effectively solved.
Alternatively, in the technical solution of the present embodiment, the throttling device 50 is an expansion valve. Preferably, the restriction device 50 is an electronic expansion valve.
Alternatively, as shown in fig. 1, in the technical solution of the present embodiment, the motor shaft 12 extends from both ends of the motor body 11, respectively. The main compressor 20 is located at a first side of the motor body 11 and is connected to a first end of the motor shaft 12, and the sub-compressor 30 is located at a second side of the motor body 11 and is connected to a second end of the motor shaft 12. By adopting the technical scheme of the embodiment, the main compressor 20 and the auxiliary compressor 30 are respectively positioned at two sides of the motor main body 11, and one motor shaft 12 of the motor 10 can be used for completing the connection of the two compressors. As another alternative embodiment, the main compressor 20 and the sub-compressor 30 may be provided on one side of the motor main body 11, and a transmission mechanism may be used to connect one end of the motor shaft 12, so that the main compressor 20 and the sub-compressor 30 may be driven by transmission.
As shown in fig. 1, in the technical solution of the present embodiment, optionally, the auxiliary compressor 30 is connected to the motor shaft 12 through a gear pair 60. In use, the auxiliary compressor 30 is driven to operate by the gear pair 60 as the motor shaft 12 rotates. More preferably, the gear pair 60 is a speed increasing gear pair to increase the rotation speed of the auxiliary compressor 30, so that the cooling circulation system has better refrigeration performance and the temperature of the motor 10 is reduced more effectively.
In the embodiment of the present invention, the positions of the main compressor 20, the gear pair 60, the sub-compressor 30, and the like are not limited to the left and right sides in the drawings, but are merely examples, and may be placed in any orientation of the motor 10 in practical applications.
Alternatively, in the technical solution of the present embodiment, the main compressor 20 is a first centrifugal compressor. Thus, the compressor system can be applied to a steam air conditioner unit. Optionally, the secondary compressor 30 is also a second centrifugal compressor. As another alternative embodiment, the sub-compressor 30 may be another type of compressor, and may be used in a cooling circulation system in combination with a common refrigerant such as freon.
Specifically, when the compressor system is applied to a steam air conditioning unit and the motor 10 rotates, the left main compressor 20 is driven to compress steam. The right side auxiliary compressor 30 does work on the gaseous refrigerant after increasing speed by the gears, and compresses the gaseous refrigerant. The system where the main compressor 20 is located compresses the steam, compresses low-temperature and low-pressure steam, improves the temperature, pressure and specific enthalpy of the steam, meets the requirements of industrial use, and is used as a high-grade heat source. The cooling circulation system where the auxiliary compressor 30 is located compresses the gaseous refrigerant, performs work on the gaseous refrigerant to obtain high-temperature and high-pressure gaseous refrigerant, then enters the condenser 40 connected with the gaseous refrigerant, is condensed again into liquid refrigerant, and then enters the cooling flow passage of the motor main body 11 through the throttling function of the throttling device 4. Since the temperature of the cooling flow passage of the motor body 11 is relatively high during operation of the motor 10, the liquid refrigerant can cool the cooling flow passage of the motor body 11, and at the same time, the cooling flow passage of the motor body 11 serves as an evaporator of the cooling circulation system, so that the liquid refrigerant is changed into a gas state again, and then enters the auxiliary compressor 30 through an external pipeline to be compressed again. A circulation system is formed.
Since the cooling flow passage of the motor main body 11 generally requires a smaller amount of refrigerant for cooling, the refrigeration requirement of the sub-compressor 30 is small, which means that the size of the impeller in the compressor is small compared to the impeller in the main compressor 20. In general, the smaller the refrigeration requirement in a centrifugal compressor, the smaller the impeller, and the higher the rotational speed requirement. The gear pair 60 is therefore a step-up gear, the gear ratio of which is selected according to the requirements for the rotational speed of the impellers in the main compressor 20, the auxiliary compressor 30.
In the above system, the type of refrigerant used by the sub-compressor 30 is not limited, and therefore, when the specific volume of the refrigerant used is large, the rotation speed required by the impeller is small, and thus, the gear pair 60 is not required, and the rotation speed requirement can be satisfied. The gear pair 60 is not essential in the system and may be eliminated in some cases.
In the technical solution of this embodiment, since the requirement of the refrigeration capacity of the auxiliary compressor 30 is small, the heat exchange capacity required by the condenser 40 is not large, so that although the air cooling heat exchange efficiency is low, the system can also use the air cooling mode to exchange heat, only the fan blade is needed to be added in the system, the cooling tower, the water pump and the like are not needed to be added, the system can also be directly placed outdoors, the machine room is not needed, and the cost can be greatly reduced. Meanwhile, the condenser 40 generally exchanges heat by water cooling. The water-cooling heat exchange is used more in an air-conditioning product system at present, is more mature, has higher heat exchange efficiency and smaller space occupation, and can reduce the space volume of the whole system. However, the water cooling heat exchange system needs to be added with a cooling water tower, a water pump and the like, and is generally not used outdoors due to the limitation of conditions, and a separate machine room needs to be established. Both the manufacturing and management costs of the system increase.
The invention also provides an air conditioning unit which comprises the compressor system, and by adopting the compressor system, the temperature of the motor 10 can be effectively reduced, the motor 10, bearings and other parts are prevented from being easily damaged due to temperature rise, and the long-term reliable operation of the compressor system is ensured.
It should be noted that, the technical scheme is especially suitable for the cooling requirement of the high rotation speed of the motor in the steam air conditioning unit, and can ensure the stable operation of the high rotation speed motor.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, and various modifications and variations can be made to the embodiments of the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A compressor system, comprising:
A motor (10), the motor (10) comprising a motor body (11) and a motor shaft (12) extending from the motor body (11);
A main compressor (20) drivingly connected to the motor shaft (12), the main compressor (20) being configured to compress a cooling medium for cooling or heating;
A secondary compressor (30) drivingly connected to the motor shaft (12);
The condenser (40) is connected with the exhaust end of the auxiliary compressor (30) through a first cooling medium pipeline, the condenser (40) is connected with the cooling flow passage of the motor main body (11) through a second cooling medium pipeline, and the cooling flow passage of the motor main body (11) is connected with the air suction end of the auxiliary compressor (30) through a third cooling medium pipeline;
And a throttle device (50) provided on the second cooling medium line.
2. Compressor system according to claim 1, characterized in that the motor shaft (12) extends from both ends of the motor body (11), respectively, the main compressor (20) being located at a first side of the motor body (11) and being connected to a first end of the motor shaft (12), and the auxiliary compressor (30) being located at a second side of the motor body (11) and being connected to a second end of the motor shaft (12).
3. Compressor system according to claim 1, characterized in that the secondary compressor (30) is connected to the motor shaft (12) by means of a gear pair (60).
4. A compressor system according to claim 3, wherein the gear pair (60) is a step-up gear pair.
5. The compressor system of claim 1, wherein the primary compressor (20) is a first centrifugal compressor.
6. Compressor system according to claim 1, characterized in that the secondary compressor (30) is a second centrifugal compressor.
7. Compressor system according to claim 1, characterized in that the throttling means (50) is an expansion valve.
8. An air conditioning unit comprising a compressor system, characterized in that the compressor system is a compressor system according to any one of claims 1 to 7.
9. The air conditioning unit of claim 8, wherein the air conditioning unit is a steam air conditioning unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911260853.8A CN112944733B (en) | 2019-12-10 | 2019-12-10 | Compressor system and air conditioning unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911260853.8A CN112944733B (en) | 2019-12-10 | 2019-12-10 | Compressor system and air conditioning unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112944733A CN112944733A (en) | 2021-06-11 |
| CN112944733B true CN112944733B (en) | 2024-08-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911260853.8A Active CN112944733B (en) | 2019-12-10 | 2019-12-10 | Compressor system and air conditioning unit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN211261360U (en) * | 2019-12-10 | 2020-08-14 | 珠海格力电器股份有限公司 | Compressor system and air conditioning unit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100960741B1 (en) * | 2008-03-12 | 2010-06-01 | 센싸타테크놀러지스코리아 주식회사 | Automatic control system for air conditioners |
| CN206582116U (en) * | 2017-02-22 | 2017-10-24 | 庆安集团有限公司 | A kind of refrigeration compressor motor cooling device |
| CN107246749B (en) * | 2017-07-08 | 2023-06-30 | 山东宏力热泵能源股份有限公司 | Industrial ultra-temperature heat pump unit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN211261360U (en) * | 2019-12-10 | 2020-08-14 | 珠海格力电器股份有限公司 | Compressor system and air conditioning unit |
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