CN107178833B - Heat recovery external machine system and air conditioning system - Google Patents
Heat recovery external machine system and air conditioning system Download PDFInfo
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- CN107178833B CN107178833B CN201710399536.9A CN201710399536A CN107178833B CN 107178833 B CN107178833 B CN 107178833B CN 201710399536 A CN201710399536 A CN 201710399536A CN 107178833 B CN107178833 B CN 107178833B
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- 238000011084 recovery Methods 0.000 title claims abstract description 39
- 238000004378 air conditioning Methods 0.000 title claims abstract description 37
- 238000010438 heat treatment Methods 0.000 claims abstract description 40
- 238000005057 refrigeration Methods 0.000 claims abstract description 16
- 239000003507 refrigerant Substances 0.000 claims description 84
- 239000007788 liquid Substances 0.000 claims description 44
- 230000001105 regulatory effect Effects 0.000 claims description 12
- 239000003921 oil Substances 0.000 description 10
- 230000005494 condensation Effects 0.000 description 5
- 238000009833 condensation Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000012808 vapor phase Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000006837 decompression Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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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
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/14—Heat exchangers specially adapted for separate outdoor units
- F24F1/16—Arrangement or mounting thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/40—Vibration or noise prevention at outdoor units
-
- 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
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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
- F25B41/30—Expansion means; Dispositions thereof
-
- 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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/025—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor units
-
- 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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
- F25B2313/02742—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using two four-way 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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/07—Details of compressors or related parts
- F25B2400/075—Details of compressors or related parts with parallel compressors
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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]
- Y02B30/56—Heat recovery units
Abstract
The invention discloses a heat recovery external machine system and an air conditioning system. The heat recovery external machine system comprises a compressor (1), a high-pressure air pipe (2) and a first branch (5), a second branch (6) and a third branch (7) which are arranged in parallel, wherein a first outdoor heat exchanger (8) is arranged on the first branch (5), a second outdoor heat exchanger (9) is arranged on the second branch (6), when the air conditioning system is in a low-temperature refrigeration mode with outdoor temperature lower than a first preset temperature or in a high-temperature heating mode with outdoor environment temperature higher than a second preset temperature, one of the first branch and the second branch is communicated, the other branch is disconnected, and the third branch is communicated with the high-pressure air pipe (2), wherein the first preset temperature is lower than the second preset temperature. According to the heat recovery external machine system, rapid refrigeration can be realized in a low-temperature environment, or rapid heating can be realized in a high-temperature environment, and the use comfort of an air conditioner is improved.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a heat recovery external machine system and an air conditioning system.
Background
Along with the development of society and energy consumption, energy conservation, environmental protection and sustainable development have become important issues to be solved in the current society. In the field of air conditioning, the heat recovery multi-connected outdoor unit can cool and cool a room to be cooled, and meanwhile, an internal unit evaporator of other rooms to be heated is converted into a condenser, and the indoor temperature is heated by utilizing heat generated by condensing a refrigerant; the indoor side can also be connected with the hot water generator, so that domestic water is heated to a certain extent, secondary utilization of energy is realized, energy waste is greatly reduced, and the step of global greenhouse effect is slowed down.
When the heat recovery external machine is operated, if only the refrigerating mode or the heating mode is operated, the room air is regulated just like the common heat pump external machine, and the room temperature can be regulated comfortably and stably. In some special areas, the heat recovery mode needs to be started, that is, part of the rooms are simultaneously cooled and part of the rooms are heated, so that the situation that the cooled rooms cannot feel cold when the outdoor environment temperature is low or the heated rooms cannot feel heat when the outdoor environment temperature is high may exist, and the use comfort of the air conditioner is affected.
Disclosure of Invention
The embodiment of the invention provides a heat recovery external machine system and an air conditioning system, which can ensure that rapid refrigeration is realized in a low-temperature environment or rapid heating is realized in a high-temperature environment, and improve the use comfort of an air conditioner.
In order to achieve the above-mentioned purpose, an embodiment of the present invention provides an external heat recovery system, including a compressor, a high-pressure air pipe, and a first branch, a second branch, and a third branch that are arranged in parallel, where the first branch is provided with a first outdoor heat exchanger, the second branch is provided with a second outdoor heat exchanger, and when the outdoor temperature of the air conditioning system is in a low-temperature refrigeration mode with a temperature lower than a first preset temperature, one of the first branch and the second branch is connected, the other branch is disconnected, and the third branch is connected with the high-pressure air pipe;
or alternatively, the first and second heat exchangers may be,
when the air conditioning system is in a high-temperature heating mode with the outdoor environment temperature higher than the second preset temperature, one of the first branch and the second branch is communicated, the other branch is disconnected, and the third branch is communicated with the high-pressure air pipe, wherein the first preset temperature is lower than the second preset temperature.
Preferably, the first branch is connected with a first four-way valve in series, and the second branch is connected with a second four-way valve in series.
Preferably, a first interface of the first four-way valve is connected with an exhaust port of the compressor, a second interface is connected with the first outdoor heat exchanger, and a third interface is communicated with a fourth interface and then connected to an air return port of the compressor; or the first interface of the second four-way valve is connected with the exhaust port of the compressor, the second interface of the second four-way valve is connected with the second outdoor heat exchanger, and the third interface of the second four-way valve is connected to the air return port of the compressor after being communicated with the fourth interface of the second four-way valve.
Preferably, the third branch is connected with the high-pressure air pipe through a third four-way valve, a first interface of the third four-way valve is connected with an air outlet of the compressor, a second interface of the third four-way valve is connected with the high-pressure air pipe, and the third interface and the fourth interface are communicated and then connected to an air return port of the compressor.
Preferably, the first throttling device is arranged on the connecting pipeline of the third port and the fourth port of each four-way valve.
Preferably, the first branch is provided with a second throttling device, and the second throttling device is arranged at one end of the first outdoor heat exchanger, which is far away from the exhaust port of the compressor; or, a third throttling device is arranged on the second branch and is arranged at one end of the second outdoor heat exchanger, which is far away from the exhaust port of the compressor.
Preferably, the heat recovery external machine system further comprises a liquid pipe, and one end of the first branch and the second branch, which is far away from the exhaust port of the compressor, are commonly connected to the liquid pipe.
Preferably, the heat recovery external machine system further comprises a refrigerant adjusting tank, wherein the third branch pipe and the liquid pipe are connected to the inlet end of the refrigerant adjusting tank through branch pipes, and the outlet end of the refrigerant adjusting tank is connected to the exhaust port of the compressor and the second branch pipe respectively through a fourth throttling device and two parallel flow regulating valves in sequence.
According to another aspect of the present invention, there is provided an air conditioning system including a heat recovery external machine system and an internal machine system, the heat recovery external machine system being the heat recovery external machine system described above.
Preferably, the heat recovery external machine system comprises a high-pressure air pipe, a liquid pipe and a low-pressure air pipe, the low-pressure air pipe is connected to an air return port of the compressor, the internal machine system comprises a first internal machine flow path, a second internal machine flow path, a third internal machine flow path and a plurality of indoor heat exchangers, the first internal machine flow path is connected to the high-pressure air pipe, the second internal machine flow path is connected to the liquid pipe, the third internal machine flow path is connected to the low-pressure air pipe, the indoor heat exchangers are connected in parallel, a first end of each indoor heat exchanger is connected to the high-pressure air pipe through a first indoor branch and is connected to the low-pressure air pipe through a second indoor branch connected in parallel with the first indoor branch, a second end of each indoor heat exchanger is connected to the liquid pipe through a third indoor branch, a fifth throttling device is arranged on the third indoor branch, a first electromagnetic valve is arranged on each first indoor branch, and a second electromagnetic valve is arranged on each second indoor branch.
By applying the technical scheme of the invention, the heat recovery external machine system comprises a compressor, a high-pressure air pipe, a first branch, a second branch and a third branch, wherein the first branch, the second branch and the third branch are arranged in parallel, the first branch is provided with a first outdoor heat exchanger, the second branch is provided with a second outdoor heat exchanger, when the air conditioning system is in a low-temperature refrigeration mode with outdoor temperature lower than a first preset temperature, one of the first branch and the second branch is communicated, the other branch is disconnected, and the third branch is communicated with the high-pressure air pipe; or when the air conditioning system is in a high-temperature heating mode with the outdoor environment temperature higher than the second preset temperature, one of the first branch and the second branch is communicated, the other branch is disconnected, and the third branch is communicated with the high-pressure air pipe, wherein the first preset temperature is lower than the second preset temperature. The heat recovery outdoor unit system comprises two outdoor heat exchangers which are connected in parallel, and at least one of the two outdoor heat exchangers is communicated, so that when the air conditioning system works, the number of the heat exchangers which participate in heat exchange can be adjusted according to the needs, the total heat exchange area of the outdoor heat exchangers can be reduced when the air conditioning system refrigerates in a low-temperature environment or heats in a high-temperature environment, the refrigerant quantity in the outdoor heat exchangers can be reduced when the air conditioning system refrigerates, the time for heating the refrigerant by the outdoor heat exchangers is reduced, the refrigerant quantity entering the indoor heating indoor unit for heating is increased, the refrigerant quantity entering the indoor cooling indoor unit for refrigerating is further increased, the indoor cooling effect is increased, the rapid refrigerating is realized, the temperature of the refrigerant flowing back to the compressor is reduced when the air conditioning system heats, the high-low pressure of the system is reduced, the compressor caused by overhigh pressure of the system is avoided, the indoor side air outlet temperature is stable, the bypass frequent opening phenomenon of the outdoor unit is reduced, the noise of the outdoor unit is reduced, the indoor rapid heating is realized, and the comfort of the indoor air conditioning is improved when the indoor unit is used.
Drawings
Fig. 1 is a schematic structural view of an air conditioning system according to an embodiment of the present invention.
Reference numerals illustrate: 1. a compressor; 2. a high pressure gas pipe; 3. a liquid pipe; 4. a low pressure gas pipe; 5. a first branch; 6. a second branch; 7. a third branch; 8. a first outdoor heat exchanger; 9. a second outdoor heat exchanger; 10. a first four-way valve; 11. a second four-way valve; 12. a third four-way valve; 13. a first throttle device; 14. a second throttle device; 15. a third throttling device; 16. a refrigerant adjusting tank; 17. a branch pipeline; 18. a fourth throttling device; 19. a flow regulating valve; 20. a first internal machine flow path; 21. a second internal machine flow path; 22. a third internal machine flow path; 23. an indoor heat exchanger; 24. a first indoor branch; 25. a second indoor branch; 26. a third indoor branch; 27. a fifth throttle device; 28. a first electromagnetic valve; 29. a second electromagnetic valve; 30. an oil-gas separator; 31. a gas-liquid separator.
Detailed Description
The invention will now be described in further detail with reference to the drawings and specific examples, which are not intended to limit the invention thereto.
Referring to fig. 1 in combination, according to an embodiment of the present invention, the heat recovery outdoor unit system includes a compressor 1, a high-pressure gas pipe 2, and a first branch 5, a second branch 6, and a third branch 7 disposed in parallel, the first branch 5 is provided with a first outdoor heat exchanger 8, the second branch 6 is provided with a second outdoor heat exchanger 9, and when the air conditioning system is in a low-temperature cooling mode in which an outdoor temperature is lower than a first preset temperature or in a high-temperature heating mode in which an outdoor ambient temperature is higher than a second preset temperature, one of the first branch and the second branch is connected, the other branch is disconnected, and the third branch is connected to the high-pressure gas pipe 2, wherein the first preset temperature is lower than the second preset temperature. Preferably, the first preset temperature is less than or equal to-10 ℃ and the second preset temperature is greater than or equal to 30 ℃.
The heat recovery external machine system comprises two parallel outdoor heat exchangers, and the two parallel outdoor heat exchangers are communicated at least, so that when the air conditioning system works, the number of the heat exchangers participating in heat exchange can be adjusted according to the needs, so that when refrigeration is carried out in a low-temperature environment or heating is carried out in a high-temperature environment, the total heat exchange area of the outdoor heat exchangers can be reduced when refrigeration is carried out, the refrigerant quantity in the outdoor heat exchangers is reduced, the time for heating the refrigerant by the outdoor heat exchangers is reduced, the refrigerant quantity for heating the indoor heating internal machine is increased, the refrigerant quantity for refrigerating the indoor refrigerating internal machine is increased, the indoor refrigerating effect is increased, quick refrigeration is realized, the temperature of the refrigerant flowing back to the compressor can be reduced when the air conditioning system works, the high-low pressure of the system is reduced, the phenomenon that the bypass of the outdoor machine is frequently opened is avoided, the noise of the outdoor machine is reduced, the indoor quick heating is realized, and the comfort of the indoor air conditioner is improved.
Preferably, the first branch 5 is connected with a first four-way valve 10 in series, and the second branch 6 is connected with a second four-way valve 11 in series. The first branch 5 is regulated by a first four-way valve 10, and controls the first outdoor heat exchanger 8 to be used as an evaporator or a condenser, and the second branch 6 is regulated by a second four-way valve 11, and controls the second outdoor heat exchanger 9 to be used as an evaporator or a condenser.
Preferably, the first branch 5 is provided with a second throttling means 14, the second throttling means 14 being arranged at the end of the first outdoor heat exchanger 8 remote from the discharge opening of the compressor 1. The second throttling device 14 can be fully opened or fully closed, and can perform a function of throttling and depressurizing the refrigerant flowing out of the first outdoor heat exchanger 8 or a function of throttling and depressurizing the refrigerant to be introduced into the first outdoor heat exchanger 8. By adjusting the opening degree of the second throttle device 14, the flow rate of the refrigerant can be adjusted, and when the second throttle device 14 is completely closed, the first outdoor heat exchanger 8 does not participate in heat exchange. Of course, only the first branch 5 may be provided with a solenoid valve for controlling the passage of the first branch 5, or other valve structures.
Preferably, the second branch 6 is provided with a third throttling means 15, the third throttling means 15 being arranged at the end of the second outdoor heat exchanger 9 remote from the compressor 1 discharge. The third throttling device 15 can be fully opened or fully closed, and can perform the function of throttling and depressurizing the refrigerant flowing out of the second outdoor heat exchanger 9 or throttling and depressurizing the refrigerant to be introduced into the second outdoor heat exchanger 9. By adjusting the opening degree of the third throttle device 15, the flow rate of the refrigerant can be adjusted, and when the third throttle device 15 is completely closed, the second outdoor heat exchanger 9 does not participate in heat exchange. Of course, only the first branch 5 may be provided with a solenoid valve for controlling the passage of the first branch 5, or other valve structures.
By controlling the opening degrees of the second throttling device 14 and the third throttling device 15, the heat exchange area of the outdoor heat exchanger can be conveniently controlled, so that the outdoor heat exchanger can realize rapid temperature adjustment under the conditions of refrigeration and heating, and the comfort of the air conditioner is improved.
Preferably, the first port of the first four-way valve 10 is connected to the exhaust port of the compressor 1, the second port is connected to the first outdoor heat exchanger 8, and the third port is connected to the return port of the compressor 1 after communicating with the fourth port.
The first port of the second four-way valve 11 is connected with the exhaust port of the compressor 1, the second port of the second four-way valve 11 is connected with the second outdoor heat exchanger 9, and the third port of the second four-way valve 11 is connected with the air return port of the compressor 1 after communicating with the fourth port of the second four-way valve 11.
The connecting pipeline of the third interface and the fourth interface of each four-way valve is provided with a first throttling device 13.
The third interface and the fourth interface of each four-way valve are communicated, so that the problem that the state switching of the four-way valve cannot be successfully completed due to the obstruction of the position switching of the valve core caused by the blockage of one of the third interface and the fourth interface can be avoided when the state switching of the four-way valve is carried out. Because the third interface is communicated with the fourth interface, the pressure at the two ends of the valve core of the four-way valve is consistent or the pressure difference is small, excessive resistance can not be formed for switching the valve core, smooth switching of the valve core position can be ensured, the adjustment of the working state of the four-way valve is realized, and the stable and reliable operation of an air conditioning system is ensured.
The first throttling device 13 is arranged on the connecting pipeline of the third interface and the fourth interface of the four-way valve, and the refrigerant flowing out of the third interface can be throttled through the first throttling device 13, so that the flowing resistance of the refrigerant through the third interface is high, the refrigerant is ensured to directly enter the indoor side after being discharged from the exhaust port of the compressor 1 when the air conditioning system is in a heating state, and the refrigerant cannot directly flow back to the exhaust port of the compressor through the third interface and the fourth interface, so that the smooth operation of the heating state of the air conditioning system is ensured.
Preferably, the third branch 7 is connected with the high-pressure air pipe 2 through a third four-way valve 12, a first interface of the third four-way valve 12 is connected with an air outlet of the compressor 1, a second interface is connected with the high-pressure air pipe 2, and the third interface is connected with an air return port of the compressor 1 after being communicated with a fourth interface. The high-pressure gaseous refrigerant discharged from the exhaust port of the compressor 1 can be selected to enter the high-pressure air pipe 2 through the third branch 7 and the third four-way valve 12 in whole or in part according to the working condition of the air conditioning system, and then enter the heating inner machine of the indoor machine through the high-pressure air pipe 2 for heating, so that the indoor part heating or whole heating can be realized.
Preferably, the heat recovery external machine system further comprises a liquid pipe 3, the ends of the first branch 5 and the second branch 6 remote from the exhaust port of the compressor 1 being commonly connected to the liquid pipe 3. Under the refrigeration working condition, the gaseous refrigerant is subjected to heat release and condensation through the outdoor heat exchanger on the first branch 5 and/or the second branch 6 to form a liquid refrigerant, then the liquid refrigerant is conveyed to the indoor unit from the liquid pipe, the indoor unit is subjected to throttling and decompression, the indoor unit is subjected to heat absorption and evaporation to form a gaseous refrigerant, and finally the gaseous refrigerant flows back to the compressor through the air return port of the compressor. Under heating working conditions, liquid refrigerant condensed by the indoor heat exchanger enters the outdoor heat exchanger on the first branch 5 and/or the second branch 6 through the liquid pipe 3 to evaporate and absorb heat, becomes gaseous refrigerant, and then enters the compressor 1 through the air return port of the compressor 1.
Preferably, the heat recovery external machine system further comprises a refrigerant adjusting tank 16, wherein the third branch 7 and the liquid pipe 3 are connected to the inlet end of the refrigerant adjusting tank 16 through branch pipelines 17, and the outlet end of the refrigerant adjusting tank 16 is connected to the exhaust port of the compressor 1 and the second branch 6 respectively through a fourth throttling device 18 and two parallel flow regulating valves 19. The refrigerant adjusting tank 16 can adjust the refrigerant quantity in the system, so that the refrigerant quantity in the system participating in operation is always matched with the operation load of the system, the operation energy efficiency of the system is improved, and the system is ensured to be always in energy efficiency maximization.
The opening degree of the two flow regulating valves 19 is controlled, so that the refrigerant quantity conveyed to the air return port of the compressor or the refrigerant quantity on the second branch 6 by the refrigerant regulating tank 16 can be conveniently controlled, the refrigerant quantity in the system is supplemented, the refrigerant quantity in the system is ensured to be moderate, the air conditioner can be operated at higher energy efficiency, the power consumption is reduced, and the refrigerating or heating efficiency is improved.
Preferably, an oil-gas separator 30 is further arranged at the exhaust port of the compressor 1, an outlet of the oil-gas separator 30 is connected to a return port of the compressor 1, and lubricating oil separated by the oil-gas separator 30 flows back into the compressor 1 through the outlet to supplement the lubricating oil in the compressor 1.
In the present embodiment, the number of compressors 1 is two, the two compressors 1 are connected in parallel, and the exhaust ports are commonly connected to the oil separator 30. The outlet of the oil-gas separator 30 is provided with two parallel oil return pipelines, each oil return pipeline is connected with an oil return port of the compressor 1, and oil is returned to the compressor 1. And the capillary tube and the regulating valve are arranged on each oil return pipeline, so that the oil return quantity of the two oil return pipelines can be regulated respectively, the oil return regulation is more flexible and convenient, and the oil return requirement of each compressor can be better met.
Preferably, a gas-liquid separator 31 is connected to the return air port of the compressor 1, and the outlet of the refrigerant adjusting tank 16 is connected to the gas-liquid separator 31. The gas-liquid separator 31 can perform gas-liquid separation on the refrigerant entering the gas-liquid separator, so that the refrigerant returning to the gas return port of the compressor 1 is in a gaseous state, and the phenomenon that liquid refrigerant enters the compressor 1 to generate liquid impact is avoided, and the compressor 1 is effectively protected.
According to an embodiment of the present invention, an air conditioning system includes a heat recovery external machine system and an internal machine system, the heat recovery external machine system being the heat recovery external machine system described above.
Preferably, the heat recovery external machine system comprises a high-pressure gas pipe 2, a liquid pipe 3 and a low-pressure gas pipe 4, the low-pressure gas pipe 4 is connected to a return air port of the compressor 1, the internal machine system comprises a first internal machine flow path 20, a second internal machine flow path 21, a third internal machine flow path 22 and a plurality of indoor heat exchangers 23, the first internal machine flow path 20 is connected to the high-pressure gas pipe 2, the second internal machine flow path 21 is connected to the liquid pipe 3, the third internal machine flow path 22 is connected to the low-pressure gas pipe 4, the indoor heat exchangers 23 are connected in parallel, a first end of each indoor heat exchanger 23 is connected to the high-pressure gas pipe 2 through a first indoor branch 24, a second end of each indoor heat exchanger 23 is connected to the liquid pipe 3 through a third indoor branch 26, a fifth throttling device 27 is arranged on each first indoor branch 24, a first electromagnetic valve 28 is arranged on each second indoor branch 25.
The following describes the operation of the air conditioning system in the low temperature cooling and heat recovery mode and the operation in the high temperature heating and heat recovery mode.
When the air conditioning system is in a low-temperature refrigeration and heat recovery mode, the indoor temperature is 20 ℃, the outdoor temperature is minus 20 ℃, four indoor heat exchangers are respectively arranged, a, b, c and d, wherein the indoor heat exchangers a, b and c are in refrigeration operation, the indoor heat exchanger d is in heating operation, when the air conditioning system starts to operate, the first four-way valve 10 is powered down, the second four-way valve 11 and the third four-way valve 12 are powered up in the working process, the refrigerant is divided into two parts, one part passes through the third four-way valve 12 and enters the indoor heat exchanger d for heating through the high-pressure air pipe 2 and the first indoor machine flow path 20, at the moment, the first indoor branch 24 where the indoor heat exchanger d is positioned is communicated, the second indoor branch 25 is disconnected, the refrigerant enters the indoor heat exchanger d from the high-pressure air pipe 2 through the first indoor branch 24 for heat release and condensation, the heating of the indoor heat exchanger d is realized, the refrigerant after heat exchange condensation becomes liquid refrigerant or refrigerant with vapor phase and liquid phase, then the refrigerant is throttled and depressurized by a fifth throttling device 27 on a third indoor branch 26 where an indoor heat exchanger d is positioned to become refrigerant fluid mainly containing gaseous refrigerant, then the refrigerant enters a second indoor machine flow path 21 communicated with a liquid pipe 3, is mixed with the refrigerant flowing in the liquid pipe 3, then the refrigerant enters indoor heat exchangers a, b and c after being throttled by respective corresponding third indoor branch 26 and fifth throttling device 27 on the third indoor branch 26, the refrigerant is cooled after heat absorption and evaporation in the indoor heat exchangers a, b and c, the refrigerant after heat absorption and evaporation enters a third indoor machine flow path 22 by respective second indoor branch 25, and enters a vapor-liquid separator 31 for vapor-liquid separation by a low-pressure air pipe 4 connected with the third indoor machine flow path 22, the separated gaseous refrigerant flows back to the compressor 1 from the air return port of the compressor 1.
In this process, the first four-way valve 10 is powered down, and the second four-way valve 11 is powered up, so that the second outdoor heat exchanger 9 does not participate in heat exchange, which is equivalent to reducing the heat exchange area and the heat exchange amount of the outdoor heat exchange system, so that the refrigerant originally entering the first outdoor heat exchanger 8 and the second outdoor heat exchanger 9 is redistributed, part of the refrigerant enters the first outdoor heat exchanger 8, and the other part of the refrigerant enters the heating inner machine through the third four-way valve 12, thereby reducing the amount of refrigerant needed to heat the refrigerant in the outdoor system, shortening the time for heating the refrigerant, improving the heat exchange capability of the heating inner machine, realizing rapid refrigeration under the low temperature condition, and ensuring that the air conditioner has more comfort.
When the air conditioning system is in a high-temperature heating and heat recovery mode, the indoor temperature is 20 ℃, the outdoor temperature is 40 ℃, four indoor heat exchangers are respectively arranged, namely a, b, c and d, wherein the indoor heat exchangers a, b and c are used for heating operation, the indoor heat exchanger d is used for heating operation as an example, after the air conditioning system starts to operate, in the working process, the first four-way valve 10 is electrified, the second four-way valve 11 and the third four-way valve 12 are electrified, a refrigerant passes through the third four-way valve 12 and enters the indoor heat exchanger d through the high-pressure air pipe 2 and the first indoor machine flow path 20 for heating, at the moment, the first indoor branch 24 where the indoor heat exchanger d is positioned is communicated, the second indoor branch 25 is disconnected, the refrigerant enters the indoor heat exchangers a, b and c from the high-pressure air pipe 2 through the first indoor branch 24 for exothermic condensation, so that the indoor heat exchangers a, b and c are heated, the refrigerant after heat release condensation becomes liquid refrigerant or refrigerant with vapor phase and liquid phase, then the refrigerant on each flow path is throttled and depressurized by a fifth throttling device 27 on a third indoor branch 26 where each indoor heat exchanger a, b and c is positioned, the throttled and depressurized refrigerant enters a second indoor machine flow path 21 communicated with a liquid pipe 3, then the refrigerant is divided into two paths at the second indoor machine flow path 21, one path enters an outdoor heat exchanger through the liquid pipe 3 to absorb heat and evaporate and then carries out vapor-liquid separation through a vapor-liquid separator 31, finally the refrigerant flows back to a compressor, the other path enters a third indoor branch 26 corresponding to the indoor heat exchanger d after being split by the second indoor machine flow path 21 and enters the indoor heat exchanger d after being throttled by a fifth throttling device 27 positioned on the third indoor branch 26, the refrigerant is cooled after the heat absorption and evaporation in the indoor heat exchanger d, then the refrigerant which absorbs heat, evaporates and gasifies enters the third inner machine flow path 22 through the second indoor branch 25 corresponding to the indoor heat exchanger d, enters the gas-liquid separator 31 through the low-pressure air pipe 4 connected with the third inner machine flow path 22 for gas-liquid separation, and the separated gaseous refrigerant flows back to the compressor 1 from the air return port of the compressor 1.
In this process, the first four-way valve 10 is powered on, the second four-way valve 11 is powered on, and the third throttling device 15 on the second branch 6 is closed, so that the second outdoor heat exchanger 9 does not participate in heat exchange, which is equivalent to reducing the heat exchange area and the heat exchange amount of the outdoor heat exchange system. In addition, the fan rotation speed of the first outdoor heat exchanger 8 is reduced, so that the air quantity of the first outdoor heat exchanger 8 is reduced, the heat exchange quantity with the external environment is reduced, heat exchange hardly exists, heat exchange is mainly carried out by means of heat exchange between indoor heat exchangers, therefore, the temperature of a refrigerant flowing back to a compressor through the low-pressure air pipe 4 and the outdoor heat exchanger through the gas-liquid separator 31 can be greatly reduced, the high pressure and the low pressure of a system are reduced, the phenomenon that the high pressure of the system is too high to cause the frequency reduction of the compressor, the back and forth fluctuation phenomenon that the air outlet temperature of the indoor unit is reduced is avoided, the stability of the indoor air outlet temperature is ensured, the high pressure of the system can be reduced by adjusting the outdoor heat exchanger during heating, the bypass frequent opening phenomenon of the outdoor unit can be reduced, the noise of the outdoor unit is reduced, and the comfort of the air conditioner is greatly improved.
When the air conditioning system is in a normal heating mode, namely when the outdoor environment temperature is lower than the indoor environment temperature, all the outdoor heat exchangers can be used as evaporators, so that the heating effect of the indoor heat exchangers is ensured. When the air conditioning system is in a normal refrigeration mode, namely when the outdoor environment temperature is higher than the indoor environment temperature, all the outdoor heat exchangers can be used as condensers, so that the refrigeration effect of the indoor heat exchangers is ensured.
Of course, the above is a preferred embodiment of the present invention. It should be noted that it will be apparent to those skilled in the art that several modifications and adaptations can be made without departing from the general principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.
Claims (4)
1. The heat recovery external machine system is characterized by comprising a compressor (1), a high-pressure air pipe (2), a first branch (5), a second branch (6) and a third branch (7) which are arranged in parallel, wherein a first outdoor heat exchanger (8) is arranged on the first branch (5), a second outdoor heat exchanger (9) is arranged on the second branch (6),
when the air conditioning system is in a low-temperature refrigeration mode with outdoor temperature lower than a first preset temperature, one of the first branch and the second branch is communicated, the other branch is disconnected, and the third branch is communicated with the high-pressure air pipe (2);
or alternatively, the first and second heat exchangers may be,
when the air conditioning system is in a high-temperature heating mode with the outdoor environment temperature higher than a second preset temperature, one of the first branch and the second branch is communicated, the other branch is disconnected, and the third branch is communicated with the high-pressure air pipe (2), wherein the first preset temperature is lower than the second preset temperature;
the first branch (5) is provided with a second throttling device (14), and the second throttling device (14) is arranged at one end of the first outdoor heat exchanger (8) far away from the exhaust port of the compressor (1);
or, a third throttling device (15) is arranged on the second branch (6), and the third throttling device (15) is arranged at one end of the second outdoor heat exchanger (9) far away from the exhaust port of the compressor (1);
the heat recovery external machine system further comprises a liquid pipe (3), and one end, far away from the exhaust port of the compressor (1), of the first branch circuit (5) and the second branch circuit (6) is commonly connected to the liquid pipe (3);
the heat recovery external machine system further comprises a refrigerant adjusting tank (16), wherein the third branch (7) and the liquid pipe (3) are connected to the inlet end of the refrigerant adjusting tank (16) through branch pipelines (17), and the outlet end of the refrigerant adjusting tank (16) is connected to the exhaust port of the compressor (1) and the second branch (6) through a fourth throttling device (18) and two parallel flow regulating valves (19) respectively;
a first four-way valve (10) is connected in series on the first branch (5), and a second four-way valve (11) is connected in series on the second branch (6);
a first interface of the first four-way valve (10) is connected with an exhaust port of the compressor (1), a second interface is connected with the first outdoor heat exchanger (8), and a third interface is communicated with a fourth interface and then connected to an air return port of the compressor (1); or alternatively, the first and second heat exchangers may be,
the first port of the second four-way valve (11) is connected with the exhaust port of the compressor (1), the second port of the second four-way valve (11) is connected with the second outdoor heat exchanger (9), and the third port of the second four-way valve (11) is communicated with the fourth port of the second four-way valve (11) and then connected to the air return port of the compressor (1);
the third branch (7) is connected with the high-pressure air pipe (2) through a third four-way valve (12), a first interface of the third four-way valve (12) is connected with an air outlet of the compressor (1), a second interface is connected with the high-pressure air pipe (2), and the third interface is connected to an air return port of the compressor (1) after being communicated with the fourth interface.
2. The heat recovery external machine system according to claim 1, wherein a first throttling device (13) is provided on the connection line of the third port and the fourth port of each four-way valve.
3. An air conditioning system comprising a heat recovery external machine system and an internal machine system, wherein the heat recovery external machine system is the heat recovery external machine system of claim 1 or 2.
4. An air conditioning system according to claim 3, characterized in that the heat recovery external machine system comprises a high pressure air pipe (2), a liquid pipe (3) and a low pressure air pipe (4), the low pressure air pipe (4) being connected to the return air port of the compressor (1), the internal machine system comprising a first internal machine flow path (20), a second internal machine flow path (21), a third internal machine flow path (22) and a plurality of indoor heat exchangers (23), the first internal machine flow path (20) being connected to the high pressure air pipe (2), the second internal machine flow path (21) being connected to the liquid pipe (3), the third internal machine flow path (22) being connected to the low pressure air pipe (4), each of the indoor heat exchangers (23) being connected in parallel, a first end of each of the indoor heat exchangers (23) being connected to the high pressure air pipe (2) by a first indoor branch (24), each of the indoor heat exchangers (23) being connected to the low pressure air pipe (4) by a second indoor branch (25) being connected in parallel with the first indoor branch (24), the third indoor heat exchanger (23) being connected to the fifth indoor heat exchanger (26) being provided with a throttle valve (28) in the third indoor heat exchanger (26), a second electromagnetic valve (29) is provided in each second indoor branch (25).
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| CN110779080B (en) * | 2019-10-10 | 2021-03-23 | 珠海格力电器股份有限公司 | Continuous heating heat recovery air conditioner outdoor system, heat recovery air conditioner and using method thereof |
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