CN114251873B - Air-cooled cold water heat pump system - Google Patents
Air-cooled cold water heat pump system Download PDFInfo
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- CN114251873B CN114251873B CN202210191602.4A CN202210191602A CN114251873B CN 114251873 B CN114251873 B CN 114251873B CN 202210191602 A CN202210191602 A CN 202210191602A CN 114251873 B CN114251873 B CN 114251873B
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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
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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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
- F25B39/00—Evaporators; Condensers
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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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- 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]
- Y02B30/12—Hot water central heating systems using heat pumps
Abstract
The invention discloses an air-cooled cold water heat pump system, which comprises a first heat exchanger, a compressor and a heat exchange assembly, wherein the compressor is communicated with the first heat exchanger, the compressor is used for compressing a refrigerant flowing out of the first heat exchanger, the heat exchange assembly is respectively communicated with the first heat exchanger and the compressor, the heat exchange assembly comprises a second heat exchanger and a third heat exchanger, the air-cooled cold water heat pump system has a first state and a second state, in the first state, the second heat exchanger is communicated with the compressor, the second heat exchanger is communicated with the first heat exchanger, the first heat exchanger is used for exchanging heat between the refrigerant flowing out of the second heat exchanger and circulating water so as to reduce the temperature of the circulating water, in the second state, the third heat exchanger is communicated with the compressor, the second heat exchanger is communicated with the third heat exchanger, and the second heat exchanger is used for exchanging heat between the refrigerant flowing out of the third heat exchanger and the external environment so as to increase the temperature of the refrigerant, the second heat exchanger is communicated with the first heat exchanger. The air-cooled cold water heat pump system has the advantages of simple structure, low cost, high heat exchange efficiency and the like.
Description
Technical Field
The invention relates to an energy supply system, in particular to an air-cooled cold water heat pump system.
Background
The energy consumption of the heating, ventilation and air conditioning system occupies 18% of the energy consumption of the whole society, the energy consumption of the heating, ventilation and air conditioning system becomes one of key factors influencing the realization of the carbon neutralization target in China, the air-cooled water chilling unit is one of important devices of the heating, ventilation and air conditioning system, the improvement of the energy efficiency of the air-cooled water chilling unit is significant to energy conservation and emission reduction, the air-cooled water chilling unit is widely applied to various occasions such as hospitals, shopping malls and office buildings, and the air-cooled water can supply cold for circulating water of a client or supply heat for the circulating water of the client.
In the related art, an air-cooled cold water heat pump system is low in energy efficiency.
Disclosure of Invention
The present invention is based on the discovery and recognition by the inventors of the following facts and problems:
in the related technology, the main components of the large-cooling capacity air-cooled water chilling unit are a screw compressor, an air-cooled heat exchanger, a dry heat exchanger and a four-way reversing valve. The working principle is that by switching a four-way reversing valve, a dry heat exchanger is used as an evaporator to supply cold for circulating water of a client during unit refrigeration; when the unit heats, the dry heat exchanger is used as a condenser to supply heat for the circulating water of the client. Because the screw compressor uses the oil lubricating bearing, the unit needs to be provided with an oil system, and lubricating oil can form an oil film on the surface of the heat exchange tube to influence the heat exchange efficiency; the screw compressor uses a three-phase asynchronous motor, and the power factor of the motor is low; the dry heat exchanger has low heat exchange efficiency, and the small temperature difference of the heat exchanger is large, so that the pressure ratio of the compressor is increased, and the energy efficiency of the compressor is reduced.
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the embodiment of the invention provides an air-cooled cold water heat pump system with high compressor efficiency and high heat exchange efficiency.
The air-cooled cold water heat pump system of the embodiment of the invention comprises: the compressor is communicated with the first heat exchanger and used for compressing a refrigerant flowing out of the first heat exchanger; the air-cooled cold water heat pump system is provided with a first heat exchanger and a second heat exchanger, the first heat exchanger is communicated with the compressor, the second heat exchanger is communicated with the compressor in the first state, the second heat exchanger is used for exchanging heat between the refrigerant compressed by the compressor and the external environment to cool the refrigerant, the second heat exchanger is communicated with the first heat exchanger so that the cooled refrigerant flows into the first heat exchanger and exchanges heat with circulating water in the first heat exchanger to cool the circulating water, the third heat exchanger is communicated with the compressor in the second state, and the third heat exchanger is used for exchanging heat between the refrigerant flowing out of the compressor and the circulating water to warm the circulating water, the second heat exchanger is communicated with the third heat exchanger, the second heat exchanger is used for exchanging heat between the refrigerant flowing out of the third heat exchanger and the external environment so as to heat the refrigerant, and the second heat exchanger is communicated with the first heat exchanger so that the heated refrigerant can flow into the first heat exchanger and be stored in the first heat exchanger.
According to the air-cooled cold water heat pump system provided by the embodiment of the invention, the first heat exchanger, the second heat exchanger and the third heat exchanger are arranged, so that the pressure ratio of the compressor is reduced, the working efficiency of the compressor is improved, and the heat exchange efficiency of the air-cooled cold water heat pump system is increased.
In some embodiments, in the first state, the third heat exchanger is respectively communicated with the second heat exchanger and the first heat exchanger, so that the refrigerant in the second heat exchanger flows into the first heat exchanger through the third heat exchanger.
In some embodiments, the air-cooled cold water heat pump system further includes a flash tank, the flash tank is communicated with the third heat exchanger so as to flash-evaporate the refrigerant flowing out of the third heat exchanger, the flash tank is communicated with the compressor so as to allow the gaseous refrigerant flowing out of the flash tank to flow into the compressor, in the first state, the flash tank is communicated with the first heat exchanger so as to allow the liquid refrigerant flowing out of the flash tank to flow into the first heat exchanger, and in the second state, the flash tank is communicated with the second heat exchanger so as to allow the liquid refrigerant flowing out of the flash tank to flow into the second heat exchanger.
In some embodiments, the air-cooled cold water heat pump system further has a third state, the second heat exchanger is in communication with the compressor, the refrigerant compressed by the compressor flows into the second heat exchanger to defrost the second heat exchanger, and the second heat exchanger is in communication with the first heat exchanger, so that the refrigerant flowing out of the second heat exchanger flows into the first heat exchanger.
In some embodiments, the compressor is an oil-free centrifugal compressor, the oil-free centrifugal compressor has a permanent magnet synchronous motor, so that the permanent magnet synchronous motor provides energy for the oil-free centrifugal compressor, in the second state, the permanent magnet synchronous motor is communicated with the third heat exchanger, so that the refrigerant flowing out of the third heat exchanger cools the permanent magnet synchronous motor, and the permanent magnet synchronous motor is communicated with the first heat exchanger, so that the refrigerant after heat exchange in the permanent magnet synchronous motor flows into the first heat exchanger.
In some embodiments, the air-cooled cold water heat pump system further includes a first adjusting assembly, and the first adjusting assembly is disposed between the permanent magnet synchronous motor and the third heat exchanger to adjust a flow rate of a refrigerant flowing into the permanent magnet synchronous motor.
In some embodiments, in the second state, the compressor is in communication with the second heat exchanger, so that a portion of the refrigerant compressed by the compressor flows into the second heat exchanger to prevent the compressor from surging.
In some embodiments, in the second state, the compressor is in communication with the first heat exchanger, so that a portion of compressed refrigerant flowing out of the compressor flows into the first heat exchanger.
In some embodiments, the air-cooled cold water heat pump system further includes a second adjusting component, and two ends of the second adjusting component are respectively connected to the compressor and the first heat exchanger, so as to adjust the flow rate of the refrigerant flowing into the first heat exchanger through the compressor.
In some embodiments, the air-cooled cold water heat pump system further comprises a communication member, the communication member connects one end of the compressor and the other end of the compressor respectively, and after the air-cooled cold water heat pump system is stopped, the communication member communicates one end of the compressor and the other end of the compressor.
Drawings
Fig. 1 is a schematic structural diagram of an air-cooled cold water heat pump system according to an embodiment of the present invention.
Reference numerals:
an air-cooled cold water heat pump system 100;
a compressor 1; a permanent magnet synchronous motor 11; a compressor discharge port 12; a compressor air supplement port 13; a compressor suction port 14; a motor cooling inlet 15; a motor cooling outlet 16; a first adjustment assembly 17; a second adjustment assembly 18; a communication member 19;
a second heat exchanger 2; a fan 21; a finned heat exchanger 22; a water collection tray 23; a gas phase port 24 of the fin heat exchanger; a liquid phase port 25 of the fin heat exchanger;
a third heat exchanger 3; a liquid barrier 31; a condenser air inlet 32; a condenser liquid outlet 33; a condenser inlet 34; a second client circulating water inlet 35; a second client circulating water outlet 36;
a flash tank 4; a flash tank liquid inlet 41; a flash tank outlet 42; a flash tank outlet 43;
a first heat exchanger 5; a liquid homogenizing plate 51; a foreign matter filter net 52; an evaporator air outlet 53; an evaporator liquid inlet 54; evaporator hot gas bypass port 55; an evaporator return air port 56; a first client circulating water inlet 57; a first client circulating water outlet 58;
a first electrically operated valve 6; a second electrically operated valve 7; a third electrically operated valve 8; a fourth electrically operated valve 9; a fifth electrically operated valve 10; a first check valve 101; a second check valve 102; a motor throttle 103; a first throttle device 104; a second flow restriction device 105; a sixth electrically operated valve 106; a flow regulating device 107.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
An air-cooled cold water heat pump system according to an embodiment of the present invention will be described with reference to the drawings.
As shown in fig. 1, the air-cooled cold water heat pump system according to the embodiment of the present invention includes a first heat exchanger 5, a compressor 1, and a heat exchange assembly.
The compressor 1 is communicated with the first heat exchanger 5, and the compressor 1 is used for compressing a refrigerant flowing out of the first heat exchanger 5. Specifically, as shown in fig. 1, the compressor 1 has a compressor exhaust port 12, a compressor air supplement port 13 and a compressor suction port 14, the first heat exchanger 5 is a flooded evaporator, the first heat exchanger 5 has an evaporator air outlet 53, an evaporator liquid inlet 54, an evaporator hot gas bypass port 55, an evaporator return air port 56, a first client circulating water inlet 57 and a first client circulating water outlet 58, and the compressor suction port 14 is communicated with the evaporator air outlet 53, so that the compressor 1 compresses a low-temperature and low-pressure refrigerant flowing out of the first heat exchanger 5 into a high-temperature and high-pressure refrigerant.
The heat exchange assembly is respectively communicated with the first heat exchanger 5 and the compressor 1, so that a refrigerant compressed by the compressor 1 flows into the first heat exchanger 5 through the heat exchange assembly, the heat exchange assembly comprises a second heat exchanger 2 and a third heat exchanger 3, the air-cooled cold water heat pump system has a first state and a second state, in the first state, the second heat exchanger 2 is communicated with the compressor 1, the second heat exchanger 2 is used for exchanging heat between the refrigerant compressed by the compressor 1 and the external environment so as to cool the refrigerant, and the second heat exchanger 2 is communicated with the first heat exchanger 5 so that the cooled refrigerant flows into the first heat exchanger 5 and exchanges heat with circulating water in the first heat exchanger 5 so as to cool the circulating water.
Specifically, as shown in fig. 1, the second heat exchanger 2 is an air-cooled heat exchanger, the second heat exchanger 2 has a fin heat exchanger gas phase port 24 and a fin heat exchanger liquid phase port 25, the third heat exchanger 3 is a shell-and-tube condenser, the third heat exchanger 3 has a condenser gas inlet 32, a condenser liquid outlet 33, a condenser liquid inlet 34, a second client circulating water inlet 35 and a second client circulating water outlet 36, the first state is a refrigeration state, the compressor gas outlet 12 is communicated with the fin heat exchanger gas phase port 24, the compressed high-temperature and high-pressure refrigerant is conveyed into the second heat exchanger 2, the high-temperature and high-pressure refrigerant exchanges heat with the external environment through the second heat exchanger 2, so that the temperature of the high-temperature and high-pressure refrigerant is reduced, the fin heat exchanger liquid phase port 25 is communicated with the evaporator liquid inlet 54, the cooled refrigerant flows into the first heat exchanger 5, circulating water flows into the first heat exchanger 5 through the first client circulating water inlet 57, the circulating water exchanges heat with the refrigerant through the first heat exchanger 5, the temperature of the refrigerant is increased, the temperature of the circulating water is reduced, and the circulating water after heat exchange flows in through the first client circulating water outlet 58, so that cooling is performed on the client.
In a second state, the third heat exchanger 3 is communicated with the compressor 1, the third heat exchanger 3 is used for exchanging heat between a refrigerant flowing out of the compressor 1 and circulating water to heat the circulating water, the second heat exchanger 2 is communicated with the third heat exchanger 3, the second heat exchanger 2 is used for exchanging heat between the refrigerant flowing out of the third heat exchanger 3 and the external environment to heat the refrigerant, and the second heat exchanger 2 is communicated with the first heat exchanger 5 so that the heated refrigerant can flow into the first heat exchanger 5 and be stored in the first heat exchanger 5.
Specifically, as shown in fig. 1, the second state is a heating state, the compressor air outlet 12 is communicated with the condenser air inlet 32, the circulating water flows into the third heat exchanger 3 through the second client circulating water inlet 35, so that the circulating water exchanges heat with the refrigerant through the third heat exchanger 3, so that the temperature of the circulating water is increased, the temperature of the refrigerant is decreased and condensed into a liquid state, the circulating water after heat exchange flows out through the second client circulating water outlet 36, the condenser liquid outlet 33 is communicated with the fin heat exchanger liquid phase port 25, the refrigerant after heat exchange by the third heat exchanger 3 flows into the second heat exchanger 2, the refrigerant exchanges heat with the external environment through the second heat exchanger 2, so that the temperature of the refrigerant is increased, the fin heat exchanger liquid phase port 25 is communicated with the condenser liquid inlet 34, the refrigerant after temperature increase by the second heat exchanger 2 flows into the first heat exchanger 5, at this time, the first heat exchanger 5 does not exchange heat, only used as a gas-liquid separator and stores redundant refrigerant.
According to the air-cooled cold water heat pump system 100, the first heat exchanger 5, the second heat exchanger 2 and the third heat exchanger 3 are arranged, in the first state, cold energy is provided for the client through the first heat exchanger 5, and in the second state, heat energy is provided for the client through the third heat exchanger 5, so that the small temperature difference between the first heat exchanger 5 and the third heat exchanger 3 is reduced, the heat exchange efficiency is improved, the pressure ratio of the compressor 1 is reduced, and the energy efficiency of the air-cooled cold water heat pump system 100 is improved.
In some embodiments, in the first state, the third heat exchanger 3 is in communication with the second heat exchanger 2 and the first heat exchanger 5, respectively, so that the refrigerant in the second heat exchanger 2 flows into the first heat exchanger 5 through the third heat exchanger 3. Specifically, in a first state, namely a refrigeration state, the condenser liquid inlet 34 is communicated with the liquid phase port 25 of the fin heat exchanger, and the condenser liquid outlet 33 is communicated with the evaporator liquid inlet 54, so that the refrigerant in the second heat exchanger 2 flows into the first heat exchanger 5 through the third heat exchanger 3, at the moment, the third heat exchanger 3 is only used as a liquid storage tank and does not exchange heat, and redundant refrigerant is stored in the second heat exchanger 2, so that the air-cooled cold water heat pump system 100 is more reasonable in setting.
In some embodiments, the air-cooled cold water heat pump system 100 further includes a flash tank 4, the flash tank 4 is in communication with the third heat exchanger 3 so as to flash-evaporate the refrigerant flowing out of the third heat exchanger 3, the flash tank 4 is in communication with the compressor 1 so that the gaseous refrigerant flowing out of the flash tank 4 flows into the compressor 1, in the first state, the flash tank 4 is in communication with the first heat exchanger 5 so that the liquid refrigerant flowing out of the flash tank 4 flows into the first heat exchanger 5, and in the second state, the flash tank 4 is in communication with the second heat exchanger 2 so that the liquid refrigerant flowing out of the flash tank 4 flows into the second heat exchanger 2.
Specifically, as shown in fig. 1, the flash tank 4 can separate the refrigerant flowing into the flash tank 4 into gas and liquid, the flash tank 4 has a flash tank inlet 41, a flash tank outlet 42 and a flash tank outlet 43, the flash tank inlet 41 is communicated with the condenser outlet 33 of the third heat exchanger 3, the flash tank outlet 42 is communicated with the compressor air supplement port 13, so that the gaseous refrigerant in the flash tank 4 flows into the compressor 1 to supplement air for the compressor 1, in the first state, the flash tank outlet 43 is communicated with the evaporator inlet 54, so that the liquid refrigerant in the flash tank 4 flows into the first heat exchanger 5 in the second state after throttling and depressurizing, and the flash tank outlet 43 is communicated with the fin heat exchanger liquid port 25, so that the liquid refrigerant in the flash tank 4 flows into the second heat exchanger 2 after throttling and depressurizing.
Because, when in the second state, the refrigerant exchanges heat with the external environment through the second heat exchanger 2, so that the temperature of the refrigerant is increased, the ambient temperature outside the second heat exchanger 2 is reduced, which will cause the water vapor in the outside air to solidify, so that the outside of the second heat exchanger 2 frosts, in some embodiments, the air-cooled cold water heat pump system further has a third state, the second heat exchanger 2 is communicated with the compressor 1, the refrigerant compressed by the compressor 1 flows into the second heat exchanger 2 to defrost the second heat exchanger 2, and the second heat exchanger 2 is communicated with the first heat exchanger 5, so that the refrigerant flowing out of the second heat exchanger 2 flows into the first heat exchanger 5. Specifically, as shown in fig. 1, the third state is a defrosting state, and the compressor exhaust port 12 is communicated with the fin heat exchanger gas port 24 of the second heat exchanger 2, so that a high-temperature and high-pressure gaseous refrigerant is introduced into the second heat exchanger 2, the defrosting operation is performed on the second heat exchanger 2, the frosting of the outside of the second heat exchanger 2 is prevented, and the working efficiency of the second heat exchanger 2 is ensured.
In some embodiments, the compressor 1 is an oil-free centrifugal compressor having a permanent magnet synchronous motor 11, so that the permanent magnet synchronous motor 11 provides energy for the oil-free centrifugal compressor, and in the second state, the permanent magnet synchronous motor 11 is communicated with the third heat exchanger 3, so that the refrigerant flowing out of the third heat exchanger 3 cools the permanent magnet synchronous motor 11, and the permanent magnet synchronous motor 11 is communicated with the first heat exchanger 5, so that the refrigerant after heat exchange in the permanent magnet synchronous motor 11 flows into the first heat exchanger 5. Therefore, an oil system of the compressor is saved through the oil-free centrifugal compressor, oil films are not formed in the heat exchange pipes in the first heat exchanger 5, the second heat exchanger 2 and the third heat exchanger 3, the heat exchange efficiency of the first heat exchanger 5, the second heat exchanger 2 and the third heat exchanger 3 is improved, in addition, the motor of the compressor 1 adopts a permanent magnet synchronous motor 11, which improves the power factor of the motor and reduces the loss of the motor, the motor is provided with a motor cooling inlet 15 and a motor cooling outlet 16, in the second state, the motor cooling inlet 15 is communicated with the condenser liquid outlet 33 of the third heat exchanger 3, the motor cooling outlet 16 is communicated with the evaporator air return port 56 of the first heat exchanger 5, thereby flow into the motor with the refrigerant that third heat exchanger 3 flows out and cool in order to the motor, flow into in 5 first heat exchangers again to improve the work efficiency of motor, prolonged the life of motor.
In some embodiments, the air-cooled cold water heat pump system 100 further includes a first adjusting assembly 17, and the first adjusting assembly 17 is disposed between the permanent magnet synchronous motor 11 and the third heat exchanger 3 to adjust a flow rate of the refrigerant flowing into the permanent magnet synchronous motor 11. Specifically, the first adjusting component 17 includes a motor throttling device 103, and the motor throttling device 103 may be an electronic expansion valve or a thermal expansion valve, the first adjusting component 17 is disposed between the motor cooling inlet 15 and the condenser liquid outlet 33 of the third heat exchanger 3, the first adjusting component 17 adjusts the valve opening of the first adjusting component 17 according to the temperature of the motor cavity or the temperature of the refrigerant flowing into the first heat exchanger 5 according to the temperature of the motor cavity, so as to adjust the flow rate of the refrigerant flowing into the permanent magnet synchronous motor 11, thereby adjusting the temperature in the motor cavity, and preventing the temperature in the permanent magnet synchronous motor 11 from being too high or too low, thereby causing the permanent magnet synchronous motor 11 to stop.
In some embodiments, in the second state, the compressor 1 is in communication with the first heat exchanger 5, such that a portion of the compressed refrigerant flowing out of the compressor 1 flows into the first heat exchanger 5. Specifically, as shown in fig. 1, the compressor discharge port 12 is communicated with the evaporator hot gas bypass port 55 of the first heat exchanger 5, and in the second state, in order to adjust the temperature of the circulating water, a part of the refrigerant compressed by the compressor 1 may be directly introduced into the first heat exchanger 5, so as to reduce the refrigerant flowing into the third heat exchanger 3, and adjust the temperature of the circulating water by changing the heat exchange amount.
Since surge, which seriously affects the safe operation of the unit, may occur when the centrifugal compressor is operated under a low flow rate or high pressure difference condition, in some embodiments, the compressor 1 is communicated with the flooded evaporator 5 in the first state, so that a part of the refrigerant compressed by the compressor 1 flows into the flooded evaporator 5. Specifically, as shown in fig. 1, the compressor exhaust port 12 of the compressor 1 is communicated with the evaporator hot gas bypass port 55 of the flooded evaporator 5 through a bypass line, and an adjusting device is arranged on the communication line, so that the compressor is prevented from surging in a refrigeration state, and the stability of the operation of the air-cooled cold water heat pump system 100 is ensured.
In some embodiments, the air-cooled cold water heat pump system 100 further includes a second adjusting assembly 18, and two ends of the second adjusting assembly 18 are respectively connected to the compressor 1 and the first heat exchanger 5, so as to adjust the flow rate of the refrigerant flowing into the first heat exchanger 5 through the compressor 1. Specifically, as shown in fig. 1, the second adjusting assembly 18 includes a third electric valve 8, the third electric valve 8 is an electronic expansion valve or a thermal expansion valve, the second adjusting assembly 18 is disposed between the compressor exhaust port 12 and the evaporator hot gas bypass port 55 of the first heat exchanger 5, and the second adjusting assembly 18 adjusts the flow rate of the compressor 1 flowing into the first heat exchanger 5, and further adjusts the flow rate in the third heat exchanger 3, so as to control the temperature of the circulating water in the third heat exchanger 3.
In some embodiments, the air-cooled cold water heat pump system 100 further includes a communication member 19, the communication member 19 is respectively connected to one end of the compressor 1 and the other end of the compressor 1, and after the air-cooled cold water heat pump system 100 is stopped, the communication member 19 communicates one end of the compressor 1 and the other end of the compressor 1. Specifically, the communicating piece 19 comprises a pipeline and a quick-opening valve, one end of the quick-opening valve is connected with the compressor exhaust port 12 of the compressor 1 through the pipeline, the other end of the quick-opening valve is connected with the compressor suction port 14 of the compressor 1 through the pipeline, after the air-cooled cold water heat pump system 100 is stopped, namely, the first heat exchanger 5, the second heat exchanger 2, the third heat exchanger 3 and the flash tank 4 are all stopped, the pipeline connected with the compressor 1 is all disconnected, and the communicating piece 19 starts to work, so that the compressor exhaust port 12 is communicated with the compressor suction port 14, the stop idle running time of the compressor 1 can be shortened, the compressor 1 is prevented from reversing, a bearing in the compressor 1 is protected, and the service life of the air-cooled cold water heat pump system 100 is prolonged.
In some embodiments, the first heat exchanger 5 is a flooded evaporator, the second heat exchanger 2 is an air-cooled heat exchanger, and the third heat exchanger 3 is a shell and tube condenser. From this, carry out the cooling through first heat exchanger 5 to the circulating water, second heat exchanger 2 makes refrigerant and external environment heat transfer, and third heat exchanger 3 carries out the heat supply to the circulating water to make that first heat exchanger 5, second heat exchanger 2 and third heat exchanger 3 set up more rationally.
It can be understood that the air-cooled cold water heat pump system 100 further includes a plurality of electric valves, and the electric valves are disposed on the pipelines between the compressor 1, the first heat exchanger 5, the second heat exchanger 2, the third heat exchanger 3 and the flash tank 4 to control the on-off of the pipeline refrigerant fluid and adjust the flow rate of the refrigerant in the pipeline.
An air-cooled cold water heat pump system 100 according to some specific examples of the present invention is described below with reference to fig. 1.
The air-cooled cold water heat pump system 100 comprises a compressor 1, a first heat exchanger 5, a second heat exchanger 2, a third heat exchanger 3 and a flash tank 4, wherein the compressor 1 is an oil-free centrifugal compressor and is provided with a permanent magnet synchronous motor 11, a compressor exhaust port 12, a compressor air supplement port 13, a compressor air suction port 14, a motor cooling inlet 15 and a motor cooling outlet 16.
The second heat exchanger 2 is an air-cooled heat exchanger and comprises a fan 21, a finned heat exchanger 22, a water collecting tray 23, a finned heat exchanger gas phase port 24 and a finned heat exchanger liquid phase port 25,
the third heat exchanger 3 is a shell-and-tube condenser, and is characterized by comprising a liquid baffle plate 31, a condenser air inlet 32, a condenser liquid outlet 33, a condenser liquid inlet 34, a second client circulating water inlet 35 and a second client circulating water outlet 36.
Flash tank 4 is vertical container, and flash tank 4 has inlet 41, flash tank gas outlet 42, flash tank liquid outlet 43, installs the level gauge (not shown in the figure) in the barrel of flash tank 4, detects the liquid level in flash tank 4 through the level gauge to prevent that the liquid level in the level gauge is too high, make in the liquid refrigerant inflow compressor 1 in the flash tank 4, or prevent that the liquid level in the level gauge is low excessively, lead to the unable liquid refrigerant of flash tank 4.
The first heat exchanger 5 is a flooded evaporator, and further comprises a liquid equalizing plate 51, a foreign matter filter screen 52, an evaporator air outlet 53, an evaporator liquid inlet 54, an evaporator hot gas bypass port 55, an evaporator air return port 56, a first client circulating water inlet 57 and a first client circulating water outlet 58. The foreign matter filter screen 52 is arranged at the upstream position of the evaporator air outlet 53, so that the foreign matter in the first heat exchanger 5 is prevented from flowing into the compressor 1 through the evaporator air outlet 53, the liquid equalizing plate 51 is arranged in the first heat exchanger 5, and the liquid equalizing plate 51 is arranged at the evaporator liquid inlet 54 and the evaporator hot gas bypass port 55, so that the liquid in the first heat exchanger 5 is uniformly distributed.
There is the tube coupling between compressor gas vent 12 and the fin heat exchanger gas port 24, and set up first motorised valve 6 on the pipeline, when air-cooled cold water heat pump system 100 is in the first state, namely air-cooled cold water heat pump system 100 is when the refrigeration operating mode, first motorised valve 6 opens so that compressor gas vent 12 communicates with fin heat exchanger gas port 24, when air-cooled cold water heat pump system 100 is in the second state or third state, namely air-cooled cold water heat pump system 100 operation heats the operating mode or when the working mode of defrosting, first motorised valve 6 closes so that compressor gas vent 12 and fin heat exchanger gas port 24 break off.
The compressor exhaust port 12 is connected with the condenser air inlet 32 through a pipeline, the pipeline is provided with a second electric valve 7, when the air-cooled cold water heat pump system 100 is in a first state, namely the air-cooled cold water heat pump system 100 operates in a refrigeration working condition, the second electric valve 7 is closed to disconnect the compressor exhaust port 12 from the condenser air inlet 32, and when the air-cooled cold water heat pump system 100 operates in a second state and a third state, namely the air-cooled cold water heat pump system 100 operates in a heating or defrosting working condition, the second electric valve 7 is opened to communicate the compressor exhaust port 12 with the condenser air inlet 32.
The compressor exhaust port 12 and the evaporator hot gas bypass port 55 are connected through a pipeline, the pipeline is provided with a third electric valve 8, when the air-cooled cold water heat pump system 100 is in a first state, namely when the air-cooled cold water heat pump system 100 operates in a refrigeration working condition, the opening size of the valve of the third electric valve 8 is adjusted according to the circulating water outlet water temperature, so that the flow between the compressor exhaust port 12 and the evaporator hot gas bypass port 55 is adjusted, when the air-cooled cold water heat pump system 100 is in a second state and a third state, namely when the air-cooled cold water heat pump system 100 operates in a heat pump or defrosting working condition, the third electric valve 8 is opened to enable the compressor exhaust port 12 to be communicated with the evaporator hot gas bypass port 55, the evaporator hot gas bypass port 55 is connected with the fin heat exchanger gas port 24 through a pipeline, and the pipeline is provided with the third electric valve 8.
The compressor exhaust port 12 and the fin heat exchanger liquid port 25 are connected through a pipeline, the pipeline is provided with the fourth electric valve 9, when the air-cooled cold water heat pump system 100 is in the first state, namely when the air-cooled cold water heat pump system 100 operates in a refrigeration working condition, the fourth electric valve 9 is closed to disconnect the compressor exhaust port 12 and the fin heat exchanger liquid port 25, when the air-cooled cold water heat pump system 100 operates in the second state and the third state, namely when the air-cooled cold water heat pump system 100 operates in a heat pump or defrosting working condition, the opening size of the valve can be adjusted according to the secondary exhaust pressure fluctuation range of the compressor 1 in a set time, and the air-cooled cold water heat pump system 100 is fully opened in the defrosting working condition.
The compressor exhaust port 12 and the compressor suction port 14 are connected by a pipeline, a fifth electric valve 10 is arranged on the pipeline, the fifth electric valve 10 is a quick-opening valve, the quick-opening valve is fully closed during the operation of the air-cooled cold water heat pump system 100, and after the air-cooled cold water heat pump system 100 receives a shutdown command, the fifth electric valve 10 is fully opened immediately so that the compressor exhaust port 12 is communicated with the compressor suction port 14.
The liquid phase port 25 of the fin heat exchanger is connected with the liquid inlet 34 of the condenser through a pipeline, the pipeline is provided with a first check valve 101, the first check valve 101 ensures that a refrigerant cannot flow to the liquid phase port 25 of the fin heat exchanger from the liquid inlet 34 of the condenser, the first check valve 101 can be replaced by an electric valve, the air-cooled cold water heat pump system 100 is in a first state, namely the electric valve is in a refrigeration working condition of the operation of the air-cooled cold water heat pump system 100, the first check valve 101 is opened, and the air-cooled cold water heat pump system 100 is in a second state and a third state, namely the air-cooled cold water heat pump system 100 is in a heat pump operation or a defrosting working condition, and the first check valve 101 is closed.
A pipeline is connected between the liquid phase port 25 of the fin heat exchanger and the flash evaporator liquid outlet 43, a second check valve 102 and a second throttling device 105 are arranged on the pipeline, and the second check valve 102 ensures that the refrigerant cannot flow from the liquid phase port 25 of the fin heat exchanger to the flash evaporator liquid outlet 43. And the second check valve 102 can be replaced by an electric valve, when the air-cooled cold water heat pump system 100 is in the first state, that is, when the electric valve operates in the refrigeration working condition of the air-cooled cold water heat pump system 100, the second check valve 102 and the second throttling device 105 are closed, and when the air-cooled cold water heat pump system 100 is in the second state and the third state, that is, when the air-cooled cold water heat pump system 100 operates in the heat pump or in the defrosting working condition, the second check valve 102 and the second throttling device 105 are opened.
The liquid outlet 33 of the condenser is connected with the motor cooling inlet 15 through a pipeline, the motor throttling device 103 is arranged on the pipeline, the motor throttling device 103 is an electronic expansion valve, and the electronic expansion valve adjusts the opening size of the valve according to the temperature of the motor cavity so as to adjust the flow of the refrigerant flowing into the motor. The motor throttling device 103 can be replaced by a thermal expansion valve, and the thermal expansion valve adjusts the opening size of the valve according to the temperature of the refrigerant flowing to the evaporator of the motor cavity so as to adjust the flow rate of the refrigerant flowing into the motor.
The condenser liquid outlet 33 and the flash tank liquid inlet 41 are connected by a pipeline, a first throttling device 104 is arranged on the pipeline, the first throttling device 104 is an electronic expansion valve, the electronic expansion valve is in a first state or a second state, namely, the opening size of the valve is adjusted according to the liquid level of the flash tank 4 when the air-cooled cold water heat pump system 100 operates in a refrigerating or heating working condition so as to adjust the flow rate of a refrigerant entering the flash tank 4, and the valve is maintained at the set valve opening size when the air-cooled cold water heat pump system 100 operates in a defrosting working condition when the air-cooled cold water heat pump system 100 operates in a third state. The first throttling device 104 can be replaced by an orifice plate, an orifice plate bypass pipeline is arranged at the front and the rear of the orifice plate, and an electronic expansion valve is arranged on the orifice plate bypass pipeline.
The air outlet 42 of the flash evaporator is connected with the air supply port 13 of the compressor through a pipeline, an electric valve can be arranged on the pipeline, and the electric valve is opened during the operation of the air-cooled cold water heat pump system 100 so as to communicate the air outlet 42 of the flash evaporator with the air supply port 13 of the compressor.
The flash tank liquid outlet 43 is connected with the evaporator liquid inlet 54 through a pipeline, a second throttling device 105 and a sixth electric valve 106 are arranged on the pipeline, the second throttling device 105 is an electronic expansion valve, when the air-cooled cold water heat pump system 100 is in a first state, namely the air-cooled cold water heat pump system 100 operates in a refrigerating working condition, the electronic expansion valve adjusts the opening size of the valve according to the exhaust superheat degree of the exhaust gas of the exhaust port 12 of the compressor, when the air-cooled cold water heat pump system 100 is in a second state, namely the air-cooled cold water heat pump system 100 operates in a heating working condition, the opening size of the valve is adjusted according to the suction superheat degree of the suction port 14 of the compressor, and when the air-cooled cold water heat pump system 100 is in a third state, namely the air-cooled cold water heat pump system 100 operates in a defrosting working condition, the valve is maintained at a set opening size. The second throttling device 105 can be replaced by a pore plate, a pore plate bypass pipeline is arranged in front of and behind the pore plate, and an electronic expansion valve is arranged on the pore plate bypass pipeline. When the air-cooled cold water heat pump system 100 is in the first state, that is, when the air-cooled cold water heat pump system 100 operates in the refrigeration condition, the sixth electric valve 106 is opened to communicate the flash tank liquid outlet 43 with the evaporator liquid inlet 54, and when the air-cooled cold water heat pump system 100 is in the second state or the third state, that is, when the air-cooled cold water heat pump system 100 operates in the heat pump or defrosting condition, the sixth electric valve 106 is closed to disconnect the flash tank liquid outlet 43 from the evaporator liquid inlet 54.
The evaporator air outlet 53 is connected with the compressor air inlet 14 through a pipeline, a flow adjusting device 107 is arranged on the pipeline, the flow adjusting device 107 is an electric valve, and the opening of the valve is adjusted by the electric valve according to the outlet water temperature of the circulating water. The flow regulating device 107 can be replaced by a guide vane regulating mechanism, the guide vane regulating mechanism is provided with a plurality of guide vanes, a driver of the guide vane regulating mechanism is a stepping motor, and the stepping motor is controlled according to the temperature of the outlet water of the circulating water.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although the above embodiments have been shown and described, it should be understood that they are exemplary and should not be construed as limiting the present invention, and that many changes, modifications, substitutions and alterations to the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the present invention.
Claims (10)
1. An air-cooled chilled water heat pump system, comprising:
the compressor is communicated with the first heat exchanger and used for compressing a refrigerant flowing out of the first heat exchanger;
the heat exchange assembly is respectively communicated with the first heat exchanger and the compressor so that the refrigerant compressed by the compressor flows into the first heat exchanger through the heat exchange assembly, the heat exchange assembly comprises a second heat exchanger and a third heat exchanger,
the air-cooled cold water heat pump system has a first state and a second state, in the first state, the second heat exchanger is communicated with the compressor, the second heat exchanger is used for exchanging heat between the refrigerant compressed by the compressor and the external environment so as to cool the refrigerant, the second heat exchanger is communicated with the first heat exchanger so that the cooled refrigerant flows into the first heat exchanger and exchanges heat with circulating water in the first heat exchanger so as to cool the circulating water,
in the second state, the third heat exchanger is communicated with the compressor, the third heat exchanger is used for exchanging heat between the refrigerant flowing out of the compressor and the circulating water to enable the circulating water to be heated, the second heat exchanger is communicated with the third heat exchanger, the second heat exchanger is used for exchanging heat between the refrigerant flowing out of the third heat exchanger and the external environment to enable the refrigerant to be heated, and the second heat exchanger is communicated with the first heat exchanger so that the heated refrigerant can flow into the first heat exchanger and be stored in the first heat exchanger.
2. The air-cooled cold water heat pump system of claim 1, wherein in the first state, the third heat exchanger is in communication with the second heat exchanger and the first heat exchanger, respectively, such that the refrigerant in the second heat exchanger flows into the first heat exchanger through the third heat exchanger.
3. The air-cooled cold water heat pump system of claim 2, further comprising a flash tank in communication with the third heat exchanger for flashing refrigerant flowing from the third heat exchanger, the flash tank being in communication with the compressor for flowing gaseous refrigerant from the flash tank into the compressor,
in the first state, the flash evaporator is communicated with the first heat exchanger so that the liquid refrigerant flowing out of the flash evaporator flows into the first heat exchanger,
in the second state, the flash evaporator is communicated with the second heat exchanger, so that the liquid refrigerant flowing out of the flash evaporator flows into the second heat exchanger.
4. The air-cooled cold water heat pump system of claim 1, wherein said air-cooled cold water heat pump system further has a third state, said second heat exchanger is in communication with said compressor, refrigerant compressed by said compressor flows into said second heat exchanger to defrost said second heat exchanger,
the second heat exchanger is communicated with the first heat exchanger, so that the refrigerant flowing out of the second heat exchanger flows into the first heat exchanger.
5. The air-cooled cold water heat pump system of claim 1, wherein said compressor is an oil-free centrifugal compressor having a permanent magnet synchronous motor such that said permanent magnet synchronous motor powers said oil-free centrifugal compressor,
in a second state, the permanent magnet synchronous motor is communicated with the third heat exchanger so that the refrigerant flowing out of the third heat exchanger cools the permanent magnet synchronous motor, and the permanent magnet synchronous motor is communicated with the first heat exchanger so that the refrigerant after heat exchange in the permanent magnet synchronous motor flows into the first heat exchanger.
6. The air-cooled cold water heat pump system of claim 5, further comprising a first regulating assembly disposed between the PMSM and the third heat exchanger for regulating a flow rate of refrigerant flowing into the PMSM.
7. The air-cooled cold water heat pump system of claim 5, wherein in the first state, the compressor is in communication with the first heat exchanger such that a portion of refrigerant compressed by the compressor flows into the first heat exchanger to prevent surge of the compressor.
8. The air-cooled cold water heat pump system of claim 1, wherein in the first state, the compressor and the first heat exchanger are in communication such that a portion of compressed refrigerant exiting the compressor flows into the first heat exchanger.
9. The air-cooled cold water heat pump system of claim 7, further comprising a second regulating assembly, wherein two ends of the second regulating assembly are respectively connected to the compressor and the first heat exchanger, so as to regulate the flow rate of the refrigerant flowing into the first heat exchanger through the compressor.
10. The air-cooled cold water heat pump system according to any one of claims 1 to 9, further comprising a communication member connecting one end of the compressor and the other end of the compressor, respectively, the communication member communicating one end of the compressor and the other end of the compressor after the air-cooled cold water heat pump system is stopped.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210191602.4A CN114251873B (en) | 2022-03-01 | 2022-03-01 | Air-cooled cold water heat pump system |
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| CN202210191602.4A CN114251873B (en) | 2022-03-01 | 2022-03-01 | Air-cooled cold water heat pump system |
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| CN114251873B true CN114251873B (en) | 2022-05-17 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201387177Y (en) * | 2009-04-27 | 2010-01-20 | 卞海鹰 | Air source heat-enhancing enthalpy-increasing heat pump system and overlapping reverse convection finned type air heat exchanger |
| CN204665746U (en) * | 2015-05-29 | 2015-09-23 | 杭州河源空调有限公司 | The double-resource integrated water chiller-heater unit of thermal source offset-type |
| CN205373133U (en) * | 2016-01-20 | 2016-07-06 | 堃霖冷冻机械(上海)有限公司 | Air conditioner hot and cold water unit |
| CN110425763A (en) * | 2018-11-20 | 2019-11-08 | 青岛海尔空调电子有限公司 | A kind of heat pump system |
| CN209783028U (en) * | 2019-03-08 | 2019-12-13 | 上海浩泽诺瑞空气净化设备有限公司 | Multifunctional integrated cold and hot water machine |
| CN110118447A (en) * | 2019-05-27 | 2019-08-13 | 颜世峰 | A kind of frequency conversion air source heat pump refrigerating heating and water-heating trilogy supply unit |
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