CN111237928B - Double-temperature double-flash air conditioner refrigerating system - Google Patents
Double-temperature double-flash air conditioner refrigerating system Download PDFInfo
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- CN111237928B CN111237928B CN202010060451.XA CN202010060451A CN111237928B CN 111237928 B CN111237928 B CN 111237928B CN 202010060451 A CN202010060451 A CN 202010060451A CN 111237928 B CN111237928 B CN 111237928B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/001—Compression cycle type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F12/00—Use of energy recovery systems in air conditioning, ventilation or screening
- F24F12/001—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air
- F24F12/006—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air using an air-to-air heat exchanger
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of heat-exchangers
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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
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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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
- F25B39/02—Evaporators
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
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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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- 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
- F25B2339/00—Details of evaporators; Details of condensers
- F25B2339/02—Details of evaporators
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Abstract
The invention provides a double-temperature double-flash air-conditioning refrigeration system, which comprises a compressor, a high-temperature compression cavity, a low-temperature compression cavity and an auxiliary compression cavity, wherein the exhaust gas of the low-temperature compression cavity is discharged through a first exhaust pipeline, and the exhaust gas of the auxiliary compression cavity is mixed with the exhaust gas of the high-temperature compression cavity and then discharged through a second exhaust pipeline; a first throttling device, a first flash evaporator, a high-temperature evaporator, a second flash evaporator, a second throttling device and a low-temperature evaporator are sequentially arranged on the first refrigerant flow path along the direction of the refrigerant flowing to the compressor; a condenser is arranged on the heat release branch; simultaneously according to the situation of outdoor environment, whether adopt tonifying qi branch road is selected through setting up the control valve, compares in the dual temperature system among the prior art, and this system not only can improve refrigeration, heating ability and efficiency, but also can make this system adapt to wideer operating mode, can both have good system performance under extreme adverse circumstances such as high temperature refrigeration, low temperature heat.
Description
Technical Field
The invention relates to the technical field of refrigeration, in particular to a double-temperature double-flash air-conditioning refrigeration system.
Background
When a conventional refrigeration air-conditioning system is used for cooling in summer, in order to meet the dehumidification requirement, the temperature of an evaporator is generally required to be reduced to a larger extent than the dew point temperature of return air. From the perspective of energy efficiency of the refrigeration system, under the condition of a certain condensation temperature of the system: the lower the evaporation temperature, i.e. the higher the compressor suction-to-discharge pressure ratio, the lower the energy efficiency of the system. In order to solve the problem of low system energy efficiency caused by large temperature difference between return air temperature and evaporating temperature during the operation of an air conditioning system, a double-evaporating-temperature system is provided, namely two high-temperature evaporators and two low-temperature evaporators are respectively arranged in a single or same heat release channel, indoor return air is released through the high-temperature evaporators and the low-temperature evaporators in sequence, and outlets of the two evaporators are respectively connected with two compression cavities of a compressor, so that the evaporating temperature of the high-temperature evaporators is higher than that of a conventional system, and the system energy efficiency is improved. However, a certain lifting space still exists in the refrigeration system, when the external environment is severe (high-temperature refrigeration or low-temperature heating), the pressure of the high-pressure side of the refrigeration system can be obviously increased, higher requirements on the pressure resistance and the reliability of the refrigeration system are provided, the exhaust temperature of the compressor is obviously increased, the oil quality of the compressor is deteriorated, the temperature of a cylinder body of the compressor is increased, high-temperature protection shutdown occurs, a rotor enameled wire can be melted when the temperature is severe, a rotor coil is short-circuited, and the compressor is burnt. On the other hand, the pressure ratio of the system is larger, the supercooling degree is reduced, and the flash dryness of throttling is higher, so that the inlet dryness of the high-temperature evaporator is increased, and the capacity of the evaporator is correspondingly reduced. Therefore, a new technical scheme is urgently needed to be provided to solve the problem of low system energy efficiency caused by large temperature difference between return air temperature and evaporation temperature when an air conditioning system runs.
Disclosure of Invention
The invention aims to provide a dual-temperature dual-flash air-conditioning refrigeration system, which reduces the inlet dryness of high-temperature and low-temperature evaporators, effectively improves the refrigeration capacity and energy efficiency of the system, and is coupled with an air-supplying and enthalpy-increasing technology, so that the system can stably and safely operate under a wider working condition.
In order to achieve the purpose, the invention adopts the following technical scheme: a dual temperature dual flash air conditioning refrigeration system comprising: the compressor comprises a high-temperature compression cavity, a low-temperature compression cavity and an auxiliary compression cavity, wherein the three compression cavities are provided with independent air suction ports, exhaust gas of the low-temperature compression cavity is discharged through a first exhaust pipeline, and exhaust gas of the auxiliary compression cavity is mixed with exhaust gas of the high-temperature compression cavity and then discharged through a second exhaust pipeline; the condenser comprises a high-temperature condenser and a low-temperature condenser; the evaporator comprises a high-temperature evaporator and a low-temperature evaporator; a flash tank comprising a first flash tank and a second flash tank; the throttling device comprises a first throttling device and a second throttling device; a control valve including a first control valve; wherein: the first exhaust pipeline refrigerant outlet is connected with the first heat release branch, and the second exhaust pipeline refrigerant outlet is connected with the second heat release branch; the low-temperature condenser is arranged on the second heat release branch; the high-temperature condenser is arranged on the first heat release branch; the other end of the second heat release branch and the other end of the first heat release branch are converged together and connected with a first refrigerant flow path, and the other end of the first refrigerant flow path is connected with a suction pipeline of the low-temperature compression cavity; the first throttling device, the first flash evaporator, the high-temperature evaporator, the second flash evaporator, the second throttling device and the low-temperature evaporator are sequentially arranged on the first refrigerant flow path along the flowing direction of the refrigerant to the compressor; the first flash device is arranged between the first throttling device and the high-temperature evaporator, a flash gas outlet of the first flash device is connected with one end of the gas supplementing branch, and the other end of the gas supplementing branch is communicated with a gas suction port of the auxiliary compression cavity; the first control valve is arranged on the air supply branch; the second flash evaporator is arranged between the high-temperature evaporator and the second throttling device, the low-temperature evaporator is arranged between the second throttling device and the low-temperature compression cavity, a flash gas outlet of the second flash evaporator is connected with a second refrigerant flow path, and the other end of the second refrigerant flow path is connected with a suction pipeline of the high-temperature compressor.
Further optionally, a third throttling device is disposed on the first heat-releasing branch on the outlet side of the high-temperature condenser, and the refrigerant with a higher temperature coming out of the high-temperature condenser is throttled and depressurized in the third throttling device and then mixed with the refrigerant coming out of the low-temperature condenser.
The invention also provides a second dual-temperature dual-flash air-conditioning refrigeration system, which comprises: the compressor comprises a high-temperature compression cavity, a low-temperature compression cavity and an auxiliary compression cavity, wherein the three compression cavities are provided with independent air suction ports, exhaust gas of the low-temperature compression cavity is discharged through a first exhaust pipeline, and exhaust gas of the auxiliary compression cavity is mixed with exhaust gas of the high-temperature compression cavity and then discharged through a second exhaust pipeline; the first exhaust pipeline exhaust gas and the second exhaust pipeline exhaust gas are mixed together and then are sent into a heat release flow path; a condenser disposed on the heat release flow path; the evaporator comprises a high-temperature evaporator and a low-temperature evaporator; a flash tank comprising a first flash tank and a second flash tank; the throttling device comprises a first throttling device and a second throttling device; a control valve including a first control valve; wherein: the other end of the heat radiation flow path is connected with a first refrigerant flow path, and the other end of the first refrigerant flow path is connected with an air suction pipeline of the low-temperature compression cavity; the first throttling device, the first flash evaporator, the high-temperature evaporator, the second flash evaporator, the second throttling device and the low-temperature evaporator are sequentially arranged on the first refrigerant flow path along the flowing direction of the refrigerant to the compressor; the first flash device is arranged between the first throttling device and the high-temperature evaporator, a flash gas outlet of the first flash device is connected with one end of the gas supplementing branch, and the other end of the gas supplementing branch is communicated with a gas suction port of the auxiliary compression cavity; the first control valve is arranged on the air supply branch; the second flash evaporator is arranged between the high-temperature evaporator and the second throttling device, the low-temperature evaporator is arranged between the second throttling device and the low-temperature compression cavity, a flash gas outlet of the second flash evaporator is connected with a second refrigerant flow path, and the other end of the second refrigerant flow path is connected with a suction pipeline of the high-temperature compressor.
Further optionally, a connecting branch is connected between the second refrigerant flow path and the gas supplementing branch, and a second control valve is arranged on the connecting branch; and the connecting point of the connecting branch and the air supplementing branch is positioned between the first control valve and the air suction port of the auxiliary compressor.
Further optionally, the first flow path is on the inlet side of the first throttling device, intermediate heat exchangers are sequentially arranged along the direction of the refrigerant flowing to the inlet of the first throttling device, and the second flow path of the refrigerant firstly flows through the intermediate heat exchangers to exchange heat with the first flow path flowing in the intermediate heat exchangers, and then is connected with a suction pipeline of the high-temperature compressor.
Further optionally, a third control valve is disposed on the inlet side of the intermediate heat exchanger of the first flow path, a reheat circuit is connected in parallel to the first flow path on both sides of the third control valve, a reheater is disposed on the reheat circuit, and the reheater and the low-temperature evaporator are operatively matched together.
Further optionally, the refrigeration system is coupled with a fresh-return air heat exchange system, a total heat exchanger is arranged between the exhaust flow path and the fresh air flow path of the fresh-return air heat exchange system, the low-temperature condenser is used as a final heat exchanger for exhausting air and is arranged on an exhaust channel at the downstream of the total heat exchanger, and the reheater, the low-temperature evaporator and the high-temperature evaporator are sequentially arranged on a fresh air channel at the downstream of the total heat exchanger along the airflow flowing direction.
Further optionally, the high temperature evaporator and the low temperature evaporator are used for realizing step cooling and dehumidification, wherein the high temperature evaporator is mainly responsible for sensible heat load, and the low temperature evaporator is mainly responsible for cooling and dehumidification.
Further optionally, the dual-temperature dual-flash air-conditioning refrigeration system is applied to a heat pump air conditioner.
Further optionally, the dual-temperature dual-flash air-conditioning refrigeration system is applied to a heat pump air conditioner, the second flow path is provided with a bypass flow path between an inlet and an outlet of the intermediate heat exchanger, and the bypass flow path is provided with a fourth control valve.
The double-temperature double-flash air-conditioning refrigeration system provided by the invention adopts a three-cylinder air-supply enthalpy-increasing technology, so that the system can stably run under a wider working condition and has good performance under extremely severe environments (high-temperature refrigeration and low-temperature heating); two condensers are adopted to form a double-evaporation and double-condensation system, the pressure ratio of the system is reduced, the energy efficiency is further improved, meanwhile, a flash tank is arranged in front of the high-temperature evaporator and the low-temperature evaporator, the inlet dryness and the specific enthalpy of the evaporators are reduced, the refrigerating capacity of the system is improved, and the system has higher energy efficiency.
Drawings
The above and other objects, features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings. The drawings described below are merely some embodiments of the present disclosure, and other drawings may be derived from those drawings by those of ordinary skill in the art without inventive effort.
FIG. 1: the refrigeration mode circulation schematic diagram of the dual-temperature dual-flash air conditioner refrigeration system of the air conditioner in the embodiment 1 of the invention;
FIG. 2: the refrigeration mode circulation schematic diagram of the dual-temperature dual-flash air conditioner refrigeration system of the air conditioner in the embodiment 2 of the invention;
FIG. 3: the refrigeration mode circulation schematic diagram of the dual-temperature dual-flash air conditioner refrigeration system of the air conditioner in the embodiment 2 of the invention;
FIG. 4: the refrigeration mode circulation schematic diagram of the dual-temperature dual-flash air conditioner refrigeration system of the air conditioner in the embodiment 3 of the invention.
In the figure:
1-a compressor; 11-high temperature compression chamber; 12-a low temperature compression chamber; 13-an auxiliary compression chamber; 2-a condenser; 21-a high temperature condenser; 22-a low temperature condenser; 23-a heat recovery condenser; 31-a high temperature evaporator; 32-a low temperature evaporator; 41-a first flash; 42-a second flash tank; 51-a first throttling means; 52-a second throttling means; 53-third throttling means; 61-a first control valve; 62-a second control valve; 63-a third control valve; 64-a fourth control valve; 7-intermediate heat exchanger; 8-a reheater; 9-total heat exchanger; 10-four-way valve
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and "a" and "an" generally include at least two, but do not exclude at least one, unless the context clearly dictates otherwise.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.
The prior art provides a double-evaporation temperature system to solve the problem of low system energy efficiency caused by large temperature difference between return air temperature and evaporation temperature when an air conditioning system operates, but the refrigeration system still has problems; when the external environment is severe (high-temperature refrigeration or low-temperature heating), the refrigeration system can cause the phenomenon that the temperature of the cylinder body of the compressor rises, and causes high-temperature protection shutdown, and can cause the problems that the enameled wire of the rotor melts, the coil of the rotor is short-circuited and the compressor is burnt in severe cases. On the other hand, the pressure ratio of the system is larger, the supercooling degree is reduced, and the flash dryness of throttling is higher, so that the inlet dryness of the high-temperature evaporator is increased, and the capacity of the evaporator is correspondingly reduced.
An object of this application is to provide a have two flash air conditioner refrigerating system of two temperature, this refrigerating system adopts the tonifying qi to increase enthalpy technique, makes the pressure ratio of system reduce, and ability, efficiency all have the improvement of certain degree, simultaneously according to outdoor environment's situation, whether selects to adopt the tonifying qi branch road through the control valve for this system adapts to wideer operating mode, can both have good system performance under extreme adverse circumstances such as high temperature refrigeration, low temperature heat.
Example 1
The embodiment provides a heat pump air conditioner with a dual-temperature dual-flash air conditioning refrigeration system, the air conditioning refrigeration system comprises a compressor 1 with a high-temperature compression cavity 11, a low-temperature compression cavity 12 and an auxiliary compression cavity 13, three compression cavities of the compressor 1 are respectively provided with an independent air suction port, wherein exhaust gas of the low-temperature compression cavity 12 is discharged through a first exhaust pipeline, and exhaust gas of the auxiliary compression cavity 13 is mixed with exhaust gas of the high-temperature compression cavity 11 and then discharged through a second exhaust pipeline; the first exhaust pipeline refrigerant outlet is connected with the first heat release branch, and the second exhaust pipeline refrigerant outlet is connected with the second heat release branch; a high-temperature condenser 21 is arranged on the first heat release branch, and a low-temperature condenser 22 is arranged on the second heat release branch; the other end of the second heat release branch and the other end of the first heat release branch are converged together and connected with a first refrigerant flow path, and the other end of the first refrigerant flow path is connected with a suction pipeline of the low-temperature compression cavity 12; in the refrigerant first flow path, a first throttling device 51, a first flash tank 41, a high-temperature evaporator 31, a second flash tank 42, a second throttling device 52, and a low-temperature evaporator 32 are provided in this order along the direction in which the refrigerant flows toward the compressor 1; wherein the first flash device 41 is arranged between the first throttling device 51 and the high-temperature evaporator 31, the flash gas outlet of the first flash device 41 is connected with one end of the gas supplementing branch, and the other end of the gas supplementing branch is communicated with the gas suction port of the auxiliary compression cavity 13; a first control valve 61 is arranged on the air supply branch; the second flash tank 42 is disposed between the high temperature evaporator 31 and the second throttling device 52, the low temperature evaporator 32 is disposed between the second throttling device 52 and the low temperature compression chamber 12, a flash gas outlet of the second flash tank 42 is connected to a second refrigerant flow path, and the other end of the second refrigerant flow path is connected to a suction pipe of the high temperature compressor 1.
The air-conditioning refrigeration system in the embodiment adopts an air-supplying enthalpy-increasing technology, a compressor 1 with three compression cavities and two condensers 2 form a double-condensation system, two flash evaporators are added in front of high-temperature evaporators and low-temperature evaporators 32 in a circulation loop of the double-condensation system to reduce the dryness of the evaporators before the inlets, the inlet dryness of the evaporators is lower, the inlet specific enthalpy of the evaporators is smaller, the refrigeration capacity is higher, and the energy efficiency of the system is higher. Meanwhile, according to the condition of the outdoor environment, whether an air supplementing branch is adopted or not is selected through the control of the first control valve 61; compared with the original dual-temperature system, the system can improve the refrigerating and heating capacity and energy efficiency, can adapt to wider working conditions, and has excellent system performance under extremely severe environments such as high-temperature refrigeration, low-temperature heating and the like.
Preferably, a third throttling device 53 is provided in the first heat-releasing branch on the outlet side of the high-temperature condenser 21, for throttling and depressurizing the refrigerant having a relatively high temperature coming out of the high-temperature condenser 21. When the refrigeration mode is operated, because the temperature of the refrigerant discharged from the high-temperature condenser 21 is higher, the refrigerant is throttled and depressurized by the third throttling device 53 and then is mixed with the refrigerant discharged from the low-temperature condenser 22, and the refrigerant is throttled and depressurized by the first throttling device 51 and then enters the first flash device 41. Because the gaseous refrigerant has a small heat exchange capacity in the evaporator, after passing through the first flash tank 41, the gaseous refrigerant enters the auxiliary compression cavity 13 through the air supply pipeline, and the separated liquid refrigerant is subjected to heat exchange by the high-temperature evaporator 31, the original liquid refrigerant is changed into a vapor-liquid two-phase state again, and at the moment, after the refrigerant is flashed again by the second flash tank 42, the gaseous refrigerant enters the high-temperature compression cavity 11 of the compressor 1, and is mixed with the exhaust gas of the auxiliary compression cavity 13 after being compressed, and then enters the low-temperature condenser 22. The liquid refrigerant separated by the second flash tank 42 is throttled again and then enters the low-temperature evaporator 32, enters the low-temperature compression cavity 12 of the compressor 1 after heat exchange is completed, and directly enters the high-temperature condenser 21 after compression is completed, so that the whole refrigeration cycle is completed, a double-evaporation double-condensation system is formed, and compared with the original system, the pressure ratio of the system is reduced, and the capacity and the energy efficiency are improved to a certain degree.
Preferably, the high-temperature evaporator 31 and the low-temperature evaporator 32 are used for realizing stepped temperature reduction and dehumidification, wherein the high-temperature evaporator 31 is mainly responsible for sensible heat load, the low-temperature evaporator 32 is mainly responsible for temperature reduction and dehumidification, dryness and humidity are clear, and heat exchange temperature difference between the evaporator and air is reduced, so that the purpose of improving energy efficiency is achieved. On the other hand, the double flash evaporators are adopted to timely separate the gaseous refrigerant, so that the inlet dryness of the evaporator is reduced, the heat exchange capacity of the evaporator is improved, and the energy efficiency is further improved. Meanwhile, a double-evaporation and double-condensation system is formed by two evaporators and two condensers 2, so that the system pressure ratio is reduced, and the energy efficiency is improved.
It should be noted that, the parallel compression cycle is suitable for the working conditions of large pressure ratio and high flash dryness, and the double-temperature cycle has significant effect improvement under the conditions of small compression ratio and large temperature difference. Therefore, it is preferable that a connection branch is connected between the second refrigerant flow path and the gas replenishing branch, and a second control valve 62 is provided on the connection branch; the connection point of the connection branch and the air supplement branch is positioned between the first control valve 61 and the air suction port of the auxiliary compressor 1. When the outdoor environment is friendly and the pressure ratio is small, the air supply branch circuit is not adopted, the first control valve 61 is closed, the second control valve 62 is opened, the auxiliary compression cavity 13 and the high-temperature compression cavity 11 are connected in parallel, and the gaseous refrigerant separated by the flash evaporator 31 enters the auxiliary compression cavity 13 and the high-temperature compression cavity 11 respectively to be compressed and discharged. When the external environment is severe (high-temperature refrigeration), the first control valve 61 is opened, the second control valve 62 is closed, the air supply branch is opened, the total refrigerant flow of the system is increased, and the heat exchange capacity is increased. The arrangement of the first control valve 61 and the second control valve 62 couples the double temperature and the parallel circulation, so that the energy efficiency of the system can be improved, the working condition of the system can be more extensive, and whether the circulation with air supplement is adopted or not can be selected according to the actual condition.
Certainly, based on the heat pump air conditioner provided by this embodiment, the four-way valve 10 is arranged on the first exhaust pipeline and the second exhaust pipeline to realize the exchange between the heating mode and the cooling mode, when the heat pump air conditioner operates in the heating mode, the flow direction of the refrigerant is opposite, and when the outdoor environment temperature is low (during low-temperature heating), the branch for supplementing air and increasing enthalpy is opened, so that the heating amount of the system is increased compared with that of the original system, the heating amount is obviously increased, and the energy efficiency is obviously improved.
The air conditioner that this embodiment provided, its two flash of dual temperature air conditioner refrigerating system that has guarantees that it has good refrigeration, heating ability and efficiency, and can also make this air conditioner adapt to wideer operating mode moreover, can both have good performance under extreme adverse circumstances such as high temperature refrigeration, low temperature heat.
Example 2
As shown in fig. 2, in the present embodiment, a heat pump air conditioner is provided with the dual-temperature dual-flash air conditioning refrigeration system provided in embodiment 1, and preferably, on the basis that the first flow path is provided with the intermediate heat exchanger 7 in sequence on the inlet side of the first throttling device 51 along the direction of the refrigerant flowing to the inlet of the first throttling device 51, and the second flow path of the refrigerant passes through the intermediate heat exchanger 7 first to exchange heat with the first flow path flowing through the intermediate heat exchanger, and then is connected to the suction pipe of the high-temperature compressor 1. The refrigerant in the second flow path passes through the intermediate heat exchanger 7 to exchange heat with the refrigerant flowing through the first flow path, and is then sent to the suction line of the high temperature compressor 1.
The first flow path is provided with a third control valve 63 on the inlet side of the intermediate heat exchanger, and the first flow path is connected in parallel with a reheat circuit on both sides of the third control valve 63, the reheat circuit being provided with a reheater, and the reheater and the low temperature evaporator 32 being operatively coupled together. The reheater 8 is a part of the high-temperature refrigerant bypass that comes out of the condenser 2, and is used for exchanging heat with the air after the heat exchange of the evaporator, and the heating is about to enter the indoor air, because the temperature of the low-temperature evaporator 32 is lower, the temperature of the introduced fresh air is lower, the comfort level of the air supply is reduced, and the reheater 8 is used for enabling the air supply to be not too low, and improving the comfort level of the fresh air.
As further preferred, as shown in fig. 3, the refrigeration system is coupled with a fresh-air-return heat exchange system, the fresh-air-return heat exchange system is provided with a total heat exchanger 9 between an exhaust air flow path and a fresh air flow path, the low-temperature condenser 22 is arranged on an exhaust air passage downstream of the total heat exchanger 9 as a final heat exchanger for exhausting air, and the reheater 8, the low-temperature evaporator 32 and the high-temperature evaporator 31 are arranged on a fresh air passage downstream of the total heat exchanger 9 in sequence along the air flow direction. The total heat exchanger 9 is a heat recovery device for improving the energy efficiency, and is used in a fresh air machine, because the temperature difference exists between the introduced fresh air and the indoor air, the total heat exchanger 9 exchanges heat between the return air discharged to the outside and the introduced fresh air, and recovers the heat of the part, thereby achieving the purpose of improving the energy efficiency. Further preferably, the low temperature condenser 22 in the refrigeration system may be replaced with a heat recovery condenser 23.
Further preferably, in the air-conditioning refrigeration system of this embodiment, a four-way reversing valve may be added to the system and configured as a heat pump type, that is, a four-way reversing valve (not shown in the figure) is disposed between the suction and exhaust pipelines (i.e., the first exhaust branch) of the low-temperature compression cavity and the first flow path, and a four-way reversing valve (not shown in the figure) is disposed between the suction and exhaust pipelines (i.e., the second exhaust branch) of the high-temperature compression cavity and the second flow path, and the second heat release flow path. It should be noted that, in order to adapt to the reverse flow of the refrigerant of the heat pump air conditioner during heating, the present application may further optimize the second flow path to provide a bypass flow path between the inlet and the outlet of the intermediate heat exchanger 7, and the bypass flow path is provided with the fourth control valve 64. The valve is used for opening during heating and short-circuiting the intermediate heat exchanger, and the circulating flow path is consistent with the prior circulating flow path during cooling.
In the air conditioner provided by this embodiment, some devices such as an intermediate heat exchanger, a reheater, and a total heat exchanger are added to the refrigeration system in embodiment 1, so that the system can be used in related application scenarios such as an air conditioner and a fresh air dehumidifier.
Example 3
As shown in fig. 4, the present embodiment provides an air conditioner having a dual-temperature dual-flash air conditioning refrigeration system comprising: the compressor 1 is provided with a high-temperature compression cavity 11, a low-temperature compression cavity 12 and an auxiliary compression cavity 13, wherein three compression cavities of the compressor 1 are provided with independent air suction ports, exhaust gas of the low-temperature compression cavity 12 is discharged through a first exhaust pipeline, and exhaust gas of the auxiliary compression cavity 13 is mixed with exhaust gas of the high-temperature compression cavity 11 and then discharged through a second exhaust pipeline; the first exhaust pipeline exhaust gas and the second exhaust pipeline exhaust gas are mixed together and then are sent into a heat release flow path; a condenser 2 is arranged on the heat release flow path; the other end of the heat release flow path is connected with a first refrigerant flow path, and the other end of the first refrigerant flow path is connected with an air suction pipeline of the low-temperature compression cavity 12; in the refrigerant first flow path, a first throttling device 51, a first flash tank 41, a high-temperature evaporator 31, a second flash tank 42, a second throttling device 52, and a low-temperature evaporator 32 are provided in this order along the direction in which the refrigerant flows toward the compressor 1; wherein the first flash device 41 is arranged between the first throttling device 51 and the high-temperature evaporator 31, the flash gas outlet of the first flash device 41 is connected with one end of the gas supplementing branch, and the other end of the gas supplementing branch is communicated with the gas suction port of the auxiliary compression cavity 13; a first control valve 61 is arranged on the air supply branch; the second flash tank 42 is disposed between the high temperature evaporator 31 and the second throttling device 52, the low temperature evaporator 32 is disposed between the second throttling device 52 and the low temperature compression chamber 12, a flash gas outlet of the second flash tank 42 is connected to a second refrigerant flow path, and the other end of the second refrigerant flow path is connected to a suction pipe of the high temperature compressor 1.
The double-temperature double-flash air-conditioning refrigeration system of the air conditioner of the embodiment is based on embodiment 1, a single condenser is used for replacing double condensers of the air conditioner, exhaust gas of high-temperature and low-temperature compression cavities is mixed, and the pressure ratio of the auxiliary compression cavity is very small, so that when compressed gaseous refrigerant is mixed with exhaust gas of the high-temperature and low-temperature compression cavities, the total exhaust temperature of the system is greatly reduced, the cylinder temperature of a compressor is effectively reduced, the oil quality deterioration of the compressor is prevented, the stability of system operation is improved, the system is simplified, and the system is more economical.
In summary, the present invention provides a dual-temperature dual-flash air-conditioning refrigeration system, which comprises a compressor including a high-temperature compression chamber, a low-temperature compression chamber and an auxiliary compression chamber, wherein the three compression chambers of the compressor are provided with independent air suction ports, wherein the exhaust air of the low-temperature compression chamber is discharged through a first exhaust pipe, and the exhaust air of the auxiliary compression chamber is mixed with the exhaust air of the high-temperature compression chamber and then discharged through a second exhaust pipe; the refrigerant discharge port of the first exhaust pipeline is connected with a first heat release branch, the refrigerant discharge port of the second exhaust pipeline is connected with a second heat release branch, the other end of the second heat release branch and the other end of the first heat release branch are converged together and connected with a first refrigerant flow path, and the other end of the first refrigerant flow path is connected with a suction pipeline of the low-temperature compression cavity; a first throttling device, a first flash evaporator, a high-temperature evaporator, a second flash evaporator, a second throttling device and a low-temperature evaporator are sequentially arranged on the first refrigerant flow path along the direction of the refrigerant flowing to the compressor; a condenser is arranged on the heat release branch; simultaneously according to the situation of outdoor environment, whether adopt tonifying qi branch road is selected through setting up the control valve, compares in the dual temperature system among the prior art, and this system not only can improve refrigeration, heating ability and efficiency, but also can make this system adapt to wideer operating mode, can both have good system performance under extreme adverse circumstances such as high temperature refrigeration, low temperature heat.
The invention provides an air-conditioning and refrigerating system with double temperature and double flash, and is not limited only to the description and the embodiments. Therefore, all equivalent changes or modifications made according to the structure, characteristics and principles of the invention claimed should be included in the scope of the invention claimed.
Claims (6)
1. The utility model provides a two flash of dual temperature air conditioner refrigerating system which characterized in that, it includes:
the compressor (1) comprises a high-temperature compression cavity (11), a low-temperature compression cavity (12) and an auxiliary compression cavity (13), wherein the three compression cavities are provided with independent air suction ports, exhaust gas of the low-temperature compression cavity (12) is discharged through a first exhaust pipeline, and exhaust gas of the auxiliary compression cavity (13) is mixed with exhaust gas of the high-temperature compression cavity (11) and then discharged through a second exhaust pipeline;
a condenser (2) comprising a high temperature condenser (21) and a low temperature condenser (22);
an evaporator including a high temperature evaporator (31) and a low temperature evaporator (32);
a flash tank comprising a first flash tank (41) and a second flash tank (42);
a throttling device comprising a first throttling device (51) and a second throttling device (52);
a control valve including a first control valve (61);
wherein:
the first exhaust pipeline refrigerant outlet is connected with a first heat release branch, and the second exhaust pipeline refrigerant outlet is connected with a second heat release branch; the low-temperature condenser (22) is arranged on the second heat release branch; the high-temperature condenser (21) is arranged on the first heat release branch;
the other end of the second heat release branch and the other end of the first heat release branch are converged together and connected with a first refrigerant flow path, and the other end of the first refrigerant flow path is connected with a suction pipeline of the low-temperature compression cavity (12);
the first flow path is provided with a third control valve (63) and an intermediate heat exchanger (7) in sequence on the inlet side of the first throttling device (51) along the direction of the refrigerant flowing to the inlet of the first throttling device (51); two sides of the third control valve (63) are connected with a reheating loop in parallel, a reheater is arranged on the reheating loop, and the reheater and the low-temperature evaporator (32) are matched together in a working mode;
the first throttling device (51), the first flash evaporator (41), the high-temperature evaporator (31), the second flash evaporator (42), the second throttling device (52) and the low-temperature evaporator (32) are sequentially arranged on the first refrigerant flow path along the direction of the refrigerant flowing to the compressor (1); wherein:
the first flash device (41) is arranged between the first throttling device (51) and the high-temperature evaporator (31), a flash gas outlet of the first flash device (41) is connected with one end of the gas supplementing branch, and the other end of the gas supplementing branch is communicated with a gas suction port of the auxiliary compression cavity (13); the first control valve (61) is arranged on the air supply branch;
the second flash evaporator (42) is arranged between the high-temperature evaporator (31) and the second throttling device (52), the low-temperature evaporator (32) is arranged between the second throttling device (52) and the low-temperature compression cavity (12), a flash gas outlet of the second flash evaporator (42) is connected with a second refrigerant flow path, the second refrigerant flow path firstly flows through the intermediate heat exchanger (7) to exchange heat with the refrigerant flowing in the first flow path of the intermediate heat exchanger, and then is connected with a suction pipeline of the high-temperature compressor (1);
the refrigerating system is coupled with a fresh air return heat exchange system, a total heat exchanger (9) is arranged between an exhaust flow path and a fresh air flow path of the fresh air return heat exchange system, the low-temperature condenser (22) is used as a final heat exchanger for exhausting air and is arranged on an exhaust channel at the downstream of the total heat exchanger (9), and the reheater, the low-temperature evaporator (32) and the high-temperature evaporator (31) are sequentially arranged on a fresh air channel at the downstream of the total heat exchanger (9) along the air flow direction.
2. A dual temperature dual flash air conditioning refrigeration system as claimed in claim 1 wherein: the first heat release branch is provided with a third throttling device (53) on the outlet side of the high-temperature condenser (21).
3. A dual temperature dual flash air conditioning refrigeration system as claimed in claim 1 wherein:
a connecting branch is connected between the second refrigerant flow path and the gas supplementing branch, and a second control valve (62) is arranged on the connecting branch; and the connecting point of the connecting branch and the air supplementing branch is positioned between the first control valve (61) and the air suction port of the auxiliary compressor (1).
4. A dual temperature dual flash air conditioning refrigeration system as claimed in any of claims 1 to 3 wherein: high temperature evaporimeter (31) and low temperature evaporimeter (32) are used for realizing the step cooling dehumidification, wherein high temperature evaporimeter (31) mainly are responsible for sensible heat load, and low temperature evaporimeter (32) mainly are responsible for cooling dehumidification.
5. The dual temperature dual flash air conditioning refrigeration system of claim 4, wherein: the dual-temperature dual-flash air-conditioning refrigeration system is applied to a heat pump air conditioner.
6. A dual temperature dual flash air conditioning refrigeration system as claimed in claim 5 wherein: the double-temperature double-flash air-conditioning refrigeration system is applied to a heat pump air conditioner, a bypass flow path is arranged between an inlet and an outlet of the intermediate heat exchanger (7) of the second flow path, and a fourth control valve (64) is arranged on the bypass flow path.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010060451.XA CN111237928B (en) | 2020-01-19 | 2020-01-19 | Double-temperature double-flash air conditioner refrigerating system |
| PCT/CN2020/122493 WO2021143244A1 (en) | 2020-01-19 | 2020-10-21 | Dual-temperature dual-flash air-conditioning refrigeration system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010060451.XA CN111237928B (en) | 2020-01-19 | 2020-01-19 | Double-temperature double-flash air conditioner refrigerating system |
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| CN111237928B true CN111237928B (en) | 2021-02-26 |
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| CN109780748B (en) * | 2019-03-14 | 2021-04-06 | 哈尔滨工业大学 | Air-supplementing type ultralow-loop-temperature air source heat pump unit and heating and refrigerating operation method thereof |
| CN111237928B (en) * | 2020-01-19 | 2021-02-26 | 珠海格力电器股份有限公司 | Double-temperature double-flash air conditioner refrigerating system |
| CN111609593B (en) * | 2020-04-24 | 2021-06-25 | 珠海格力电器股份有限公司 | Double-temperature air conditioning system, control method and air conditioner |
| CN111707015B (en) * | 2020-07-02 | 2024-02-27 | 珠海格力节能环保制冷技术研究中心有限公司 | Air conditioning system and control method thereof |
| CN112128852B (en) * | 2020-09-14 | 2024-04-12 | 珠海格力电器股份有限公司 | Double-condensation-temperature heat pump system and control method |
| CN112268321B (en) * | 2020-10-26 | 2021-12-03 | 珠海格力电器股份有限公司 | Mixed working medium refrigerating system and dehumidifier |
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- 2020-10-21 WO PCT/CN2020/122493 patent/WO2021143244A1/en active Application Filing
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| US10465962B2 (en) * | 2015-11-16 | 2019-11-05 | Emerson Climate Technologies, Inc. | Compressor with cooling system |
| CN106500393A (en) * | 2016-11-10 | 2017-03-15 | 青岛海尔中央空调有限公司 | There is the multi-connected machine heat pump of three-level centrifugal compressor |
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| WO2021143244A1 (en) | 2021-07-22 |
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