CN112212538A - Double-source heat pump air conditioning unit - Google Patents

Double-source heat pump air conditioning unit Download PDF

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Publication number
CN112212538A
CN112212538A CN202011272965.8A CN202011272965A CN112212538A CN 112212538 A CN112212538 A CN 112212538A CN 202011272965 A CN202011272965 A CN 202011272965A CN 112212538 A CN112212538 A CN 112212538A
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CN
China
Prior art keywords
heat exchanger
source
air
water source
valve
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Pending
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CN202011272965.8A
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Chinese (zh)
Inventor
李振超
柳金亮
石铸
何建生
贺秋
彭恺
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Guangdong Shenling Commercial Air Conditioning Equipment Co ltd
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Guangdong Shenling Commercial Air Conditioning Equipment Co ltd
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Application filed by Guangdong Shenling Commercial Air Conditioning Equipment Co ltd filed Critical Guangdong Shenling Commercial Air Conditioning Equipment Co ltd
Priority to CN202011272965.8A priority Critical patent/CN112212538A/en
Publication of CN112212538A publication Critical patent/CN112212538A/en
Pending legal-status Critical Current

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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B30/00—Heat pumps
    • F25B30/06—Heat pumps characterised by the source of low potential heat
    • 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
    • F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • F25B43/006—Accumulators
    • 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
    • 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
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2513—Expansion valves

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Power Engineering (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)

Abstract

The invention relates to the technical field of heat pump units, in particular to a double-source heat pump air conditioning unit which comprises a heat pump driving mechanism, a user heat exchanger, a water source heat exchanger, an air source heat exchanger and an auxiliary reversing liquid storage device, wherein the user heat exchanger, the water source heat exchanger, the air source heat exchanger and the auxiliary reversing liquid storage device are communicated with the heat pump driving mechanism through a double four-way valve assembly, the other end of the water source heat exchanger is communicated with the user heat exchanger through a water source side direction control valve, and the other end. The double four-way valve assembly, the water source side direction control valve and the air source side direction control valve are matched to realize free switching and combination of refrigeration and heating of the water source heat pump and refrigeration and heating of the air source heat pump, so that the operation energy efficiency is improved, the advantages of the water source heat pump and the air source heat pump which are intensively applied in one unit are exerted, and the double four-way valve assembly is suitable for different working conditions. The auxiliary reversing liquid storage device is used for storing redundant refrigerant, and is beneficial to ensuring the balance of the refrigerant in the system and the stability of the refrigerant in different modes during switching.

Description

Double-source heat pump air conditioning unit
Technical Field
The invention relates to the technical field of heat pump units, in particular to a double-source heat pump air conditioning unit.
Background
The water source heat pump is a technology for realizing the transfer of low-level heat energy to high-level heat energy by utilizing low-level heat energy formed by utilizing solar energy and geothermal energy absorbed in shallow water sources on the earth surface, such as underground water, rivers and lakes, and adopting a heat pump principle and inputting a small amount of high-level electric energy. The air source heat pump technology is an energy-saving and environment-friendly heating technology established on the basis of the reverse Carnot cycle principle, obtains a low-temperature heat source through air heat storage, and becomes a high-temperature heat source after system high-efficiency heat collection and integration for heating or supplying hot water.
However, the water source heat pump is below zero, the unit cannot operate due to the fact that water freezes and solidifies, the application field of the unit is greatly limited, an evaporator of the air source heat pump unit is air-cooled, although a refrigerant flow path, a fan air channel and the like are continuously optimized, the problems of low energy efficiency and low operation efficiency under the low-temperature environment condition still exist. Because the water source heat pump unit and the air source heat pump unit are still limited in use, the advantages of high efficiency of the water source heat pump and wide operation range of the air source heat pump are needed to be utilized, the heat pump unit is optimally designed to realize free switching and combination of the water source heat pump and the air source heat pump, the application range of the heat pump unit is expanded, the operation energy efficiency is improved, and meanwhile, the stability of system performance when the functions of the water source heat pump and the air source heat pump unit are switched is also needed to be improved.
Disclosure of Invention
The invention aims to provide a double-source heat pump air conditioning unit, which expands the application range of the air conditioning unit and improves the operation energy efficiency and the stability of system performance during function switching.
In order to realize the purpose, the following technical scheme is provided:
a dual source heat pump air conditioning unit comprising:
the heat pump driving mechanism comprises a compressor and a gas-liquid separator communicated with the compressor;
the user heat exchanger is communicated with the heat pump driving mechanism through a double four-way valve assembly, and the double four-way valve assembly comprises a heat source four-way valve and a cold and hot four-way valve which are communicated with each other;
one end of the water source heat exchanger is communicated with the heat pump driving mechanism through the double four-way valve assembly, and the other end of the water source heat exchanger is communicated with the user heat exchanger through a water source side direction control valve;
one end of the air source heat exchanger is communicated with the heat pump driving mechanism through the double four-way valve assembly, and the other end of the air source heat exchanger is communicated with the user heat exchanger through an air source side direction control valve;
and the auxiliary reversing liquid storage device is used for storing redundant refrigerant, one end of the auxiliary reversing liquid storage device is communicated with the gas-liquid separator through a first liquid storage electromagnetic valve, and the other end of the auxiliary reversing liquid storage device is communicated with the user heat exchanger through a second liquid storage electromagnetic valve.
Further, a port of the cold and hot four-way valve, a port of the air source heat exchanger, a port of the water source heat exchanger, and a port of the gas-liquid separator are respectively connected to four ports of the heat source four-way valve, and a port of the heat source four-way valve, a port of the user heat exchanger, another port of the gas-liquid separator, and the compressor are respectively connected to four ports of the cold and hot four-way valve.
Further, an electronic expansion valve is arranged between the compressor and the other port of the user heat exchanger.
Furthermore, the water source side direction control valve comprises a water source side electromagnetic valve and a water source side check valve, and the water source side electromagnetic valve and the water source side check valve are arranged on a communicating pipeline between the water source heat exchanger and the user heat exchanger in parallel.
Furthermore, the water source side direction control valve further comprises a water source side electronic expansion valve, and the water source side electronic expansion valve is arranged on a communicating pipeline between the water source heat exchanger and the user heat exchanger and is positioned between the water source heat exchanger and the water source side one-way valve.
Furthermore, a water source side reservoir is arranged on a communication pipeline between the water source heat exchanger and the user heat exchanger, and the water source side reservoir is positioned between the water source heat exchanger and the water source side electronic expansion valve.
Further, the air source side directional control valve includes an air source side electromagnetic valve and an air source side check valve, and the air source side electromagnetic valve and the air source side check valve are arranged in parallel on a communication pipeline between the air source heat exchanger and the user heat exchanger.
Further, the air source side directional control valve further comprises an air source side electronic expansion valve, and the air source side electronic expansion valve is arranged on a communication pipeline between the air source heat exchanger and the user heat exchanger and is positioned between the air source heat exchanger and the air source side check valve.
Further, an air source side reservoir is arranged on a communication pipeline between the user heat exchanger and the air source heat exchanger, the air source side reservoir is located between the user heat exchanger and the air source side electromagnetic valve, and the second reservoir electromagnetic valve is arranged on the communication pipeline between the air source side reservoir and the first reservoir electromagnetic valve.
Further, under the matching adjustment of the water source side direction control valve, the air source side direction control valve and the double four-way valve assembly, the double-source heat pump air conditioning unit can be adjusted to operate in any one of a water source refrigeration mode, a water source heating mode, an air source refrigeration mode and an air source heating mode;
under the operation of the water source refrigeration mode and the water source heating mode, the user heat exchanger correspondingly operates with the water source heat exchanger at the same time, and the air source heat exchanger stops operating and is communicated with the gas-liquid separator;
and under the operation of the air source cooling mode and the air source heating mode, the user heat exchanger correspondingly operates simultaneously with the air source heat exchanger, and the water source heat exchanger stops operating and is communicated with the gas-liquid separator.
The invention has the beneficial effects that:
according to the double-source heat pump air conditioning unit, the water source heat exchanger and the air source heat exchanger which are matched with the heat pump driving mechanism are arranged, so that the function of a water source and air source combined double-source heat pump unit is realized, the free switching and combination of the refrigeration and heating of the water source heat pump and the air source heat pump are realized through the double four-way valve assembly and the directional control valve, so that the heat exchange operation of a user heat exchanger and the water source heat exchanger or the heat exchange operation of the user heat exchanger and the air source heat exchanger are realized, the advantages of the water source heat pump and the air source heat pump which are used in a centralized mode in one unit are exerted, the heat exchange modes of a condensation side heat exchanger and an. In addition, the auxiliary reversing liquid storage device can timely transfer redundant refrigerants to the gas-liquid separator, matching and balance of the refrigerants in the compressor in the heat pump driving mechanism are favorably guaranteed, and stability of system performance when the water source heat exchanger and the air source heat exchanger are switched is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a dual-source heat pump air conditioning unit according to an embodiment of the present invention.
In the figure:
1-heat pump driving mechanism; 11-a compressor; 12-a gas-liquid separator; 13-heat source four-way valve; 14-a cold and hot four-way valve; 15-electronic expansion valve;
20-a user heat exchanger;
30-water source heat exchanger; 31-water source side reservoir; 32-water source side electronic expansion valve; 33-water source side electromagnetic valve; 34-water source side check valve;
40-air source heat exchanger; 41-air source side reservoir; 42-air source side electronic expansion valve; 43-air source side solenoid valve; 44-air source side check valve;
50-an auxiliary reversing reservoir; 51-a first reservoir solenoid valve; 52-second reservoir solenoid valve.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings.
In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally laid out when the product is used, and are only for convenience of description of the present invention, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", and the like are used for descriptive purposes only or to distinguish between different structures or components and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
Referring to fig. 1, the present embodiment provides a dual-source heat pump air conditioning unit, which includes a heat pump driving mechanism 1, a user heat exchanger 20, a water source heat exchanger 30, an air source heat exchanger 40, and an auxiliary reversing reservoir 50. The heat pump driving mechanism 1 comprises a compressor 11 and a gas-liquid separator 12 communicated with the compressor 11, and the user heat exchanger 20 is communicated with the heat pump driving mechanism 1 through a double four-way valve assembly. One end of the water source heat exchanger 30 is communicated with the heat pump driving mechanism 1 through a double four-way valve assembly, the other end is communicated with the user heat exchanger 20 through a water source side direction control valve, one end of the air source heat exchanger 40 is communicated with the heat pump driving mechanism 1 through the double four-way valve assembly, and the other end is communicated with the user heat exchanger 20 through an air source side direction control valve. The auxiliary reversing accumulator 50 is used for storing redundant refrigerant, and has one end connected to the gas-liquid separator 12 through a first accumulator solenoid valve 51 and the other end connected to the user heat exchanger 20 through a second accumulator solenoid valve 52.
In the double-source heat pump air conditioning unit, the functions of the water source and air source combined double-source heat pump unit are realized by arranging the water source heat exchanger 30 and the air source heat exchanger 40 which are matched with the heat pump driving mechanism 1. And the free switching and combination of the refrigeration and heating of the water source heat pump and the refrigeration and heating of the air source heat pump are realized through the matching action of the double four-way valve component, the water source side direction control valve and the air source side direction control valve, so that the user heat exchanger 20 and the water source heat exchanger 30 or the user heat exchanger 20 and the air source heat exchanger 40 carry out heat exchange operation, the advantages of the water source heat pump and the air source heat pump which are intensively used in one unit are exerted, the heat exchange modes of the condensation and evaporation side heat exchangers are freely switched according to the use requirements and the environmental conditions, the heat exchange device is suitable for different use. In addition, under the cooperation of the auxiliary reversing liquid storage device 50, redundant refrigerants can be transferred to the gas-liquid separator 12 in time, so that matching and balance of the refrigerants in the compressor 11 in the heat pump driving mechanism 1 can be guaranteed, and the stability of system performance when the water source heat exchanger 30 and the air source heat exchanger 40 are switched is improved.
In this embodiment, referring to fig. 1, the dual four-way valve assembly includes a heat source four-way valve 13 and a cold and hot four-way valve 14 which are communicated with each other, and the heat source four-way valve 13 and the cold and hot four-way valve 14 are cooperatively disposed, so that the user heat exchanger 20, the water source heat exchanger 30 and the air source heat exchanger 40 can switch different ports on the heat source four-way valve 13 and the cold and hot four-way valve 14 to be communicated with the compressor 11 or the gas-liquid separator 12, so that the refrigerant is discharged from the compressor 11 and returns to the gas-liquid separator 12 through a closed loop in different.
Specifically, one port of the hot and cold four-way valve 14, one port of the air source heat exchanger 40, one port of the water source heat exchanger 30, and one port of the gas-liquid separator 12 are connected to four ports of the heat source four-way valve 13, respectively. One port of the heat source four-way valve 13, one port of the user heat exchanger 20, the other port of the gas-liquid separator 12, and the compressor 11 are connected to four ports of the hot and cold four-way valve 14, respectively. In the cooling mode, the user heat exchanger 20 can be selected to exchange heat with the water source heat exchanger 30 or the air source heat exchanger 40 by switching different ports on the heat source four-way valve 13 and the cold and heat four-way valve 14, so that the water source heat pump cooling and the air source heat pump cooling can be freely switched. In addition, under the cooperation of the gas-liquid separator 12, the refrigerant at each path can be returned to the gas-liquid separator 12 again by switching different ports on the heat source four-way valve 13 and the cold and hot four-way valve 14, so that the lack of refrigerant in the compressor 11 and in the pipeline is avoided, and the efficient operation of the system is ensured.
In this embodiment, referring to fig. 1, an electronic expansion valve 15 is disposed between the compressor 11 and the other port of the user heat exchanger 20, and the electronic expansion valve 15 may be a liquid injection electronic expansion valve or an EVI (enhanced vapor injection) electronic expansion valve, so as to ensure that the compressor 11 operates normally when the dual-source heat pump unit operates in a low-temperature environment.
Specifically, the electronic expansion valve 15 is a liquid injection electronic expansion valve, when the heat pump unit operates in a low-temperature environment, the double-source heat pump unit can preferentially select an air source for heating, the liquid injection electronic expansion valve can effectively assist liquid injection cooling, the overhigh exhaust temperature of the compressor 11 during low-temperature operation is avoided, and the normal operation of the compressor 11 is ensured.
Specifically, the electronic expansion valve 15 is set as an EVI (enhanced vapor injection) electronic expansion valve, the corresponding compressor 11 can select an enhanced vapor injection compressor, and a high-efficiency and energy-saving air injection system is formed by combining with a high-efficiency subcooler, so that the exhaust temperature of the compressor 11 is prevented from being too high during low-temperature operation, the operation range of the double-source heat pump air conditioning unit is remarkably improved, and the compressor 11 can be operated more efficiently under the economic and energy-saving premise during operation in a low-temperature or even ultra-low-temperature environment.
In the present embodiment, referring to fig. 1, the water source side direction control valve includes a water source side solenoid valve 33 and a water source side check valve 34, and the water source side solenoid valve 33 and the water source side check valve 34 are disposed in parallel on a communication pipe between the water source heat exchanger 30 and the user heat exchanger 20. The water source side electromagnetic valve 33 or the water source side check valve 34 is arranged to communicate the water source heat exchanger 30 with the user heat exchanger 20, and the water source side electromagnetic valve 33 and the water source side check valve 34 are arranged in parallel to change the flow direction of the refrigerant in a matching manner, the refrigerant flows from the user heat exchanger 20 to the water source heat exchanger 30 when being switched to the water source side electromagnetic valve 33, the refrigerant flows from the water source heat exchanger 30 to the user heat exchanger 20 when being switched to the water source side check valve 34, and the switching between the water source heat pump cooling mode and the water source heat pump heating mode is realized by matching the arrangement of the heat source four-way valve 13 and the.
In this embodiment, referring to fig. 1, the water source side directional control valve further includes a water source side electronic expansion valve 32, and the water source side electronic expansion valve 32 is disposed on a communication pipe between the water source heat exchanger 30 and the user heat exchanger 20, between the water source heat exchanger 30 and the water source side check valve 34. The water source heat exchanger 30 and the user heat exchanger 20 are matched such that refrigerant flowing through the water source side electronic expansion valve 32 throttles to produce different state changes in different flow directions in the piping of the water source heat exchanger 30 and the user heat exchanger 20, so as to perform heat exchange between the water source heat exchanger 30 and the user heat exchanger 20.
In the present embodiment, referring to fig. 1, a water source side reservoir 31 is disposed on a communication pipeline between the water source heat exchanger 30 and the user heat exchanger 20, and the water source side reservoir 31 is located between the water source heat exchanger 30 and the water source side electronic expansion valve 32. The excessive refrigerant passing through the water source heat exchanger 30 can be stored through the water source side accumulator 31, so that the refrigerant passing through between the water source heat exchanger 30 and the user heat exchanger 20 can perform stable heat exchange, and meanwhile, the excessive refrigerant can be timely supplied to the compressor 11 again for recycling, and the heat exchange efficiency is improved.
In the present embodiment, referring to fig. 1, the air-source-side directional control valve includes an air-source-side electromagnetic valve 43 and an air-source-side check valve 44, and the air-source-side electromagnetic valve 43 and the air-source-side check valve 44 are disposed in parallel on the communication pipe between the air-source heat exchanger 40 and the user heat exchanger 20. The air source side electromagnetic valve 43 or the air source side check valve 44 is provided to communicate the air source heat exchanger 40 with the user heat exchanger 20, and the air source side electromagnetic valve 43 and the air source side check valve 44 are provided in parallel to change the flow direction of the refrigerant, the refrigerant flows from the user heat exchanger 20 to the air source heat exchanger 40 when switched to the air source side electromagnetic valve 43, the refrigerant flows from the air source heat exchanger 40 to the user heat exchanger 20 when switched to the air source side check valve 44, and the switching between the air source heat pump cooling mode and the water source heat pump heating mode is realized in cooperation with the settings of the heat source four-way valve 13 and the cold and heat four-way.
In the present embodiment, referring to fig. 1, the air source side directional control valve further includes an air source side electronic expansion valve 42, and the air source side electronic expansion valve 42 is disposed on a communication pipe between the air source heat exchanger 40 and the user heat exchanger 20, between the air source heat exchanger 40 and the air source side check valve 44. The air-source heat exchanger 40 and the user heat exchanger 20 are coupled such that the throttling of the flow of refrigerant through the air-source-side electronic expansion valve 42 produces different state changes in the different flow directions of the refrigerant in the piping of the air-source heat exchanger 40 and the user heat exchanger 20 for heat exchange between the air-source heat exchanger 40 and the user heat exchanger 20.
In the present embodiment, referring to fig. 1, an air source-side accumulator 41 is provided on a communication pipe between the user heat exchanger 20 and the air source heat exchanger 40, the air source-side accumulator 41 being located between the user heat exchanger 20 and the air source-side solenoid valve 43. The air source side accumulator 41 can store the redundant refrigerant on the communication pipeline between the user heat exchanger 20 and the air source heat exchanger 40, so that the refrigerant passing through the air source heat exchanger 40 and the user heat exchanger 20 can perform stable heat exchange, and meanwhile, the redundant refrigerant can be timely supplied to the compressor 11 again for recycling, and the heat exchange efficiency is improved.
Further, referring to fig. 1, the second reservoir solenoid valve 52 is disposed on a communication pipe between the air source-side reservoir 41 and the first reservoir solenoid valve 51, and the auxiliary reversing reservoir 50 is configured to store excessive refrigerant in different heating modes through the cooperative arrangement of the second reservoir solenoid valve 52 and the first reservoir solenoid valve 51, so as to perform a refrigerant forced migration operation.
Optionally, one end of the first reservoir solenoid valve 51 is connected to the gas-liquid separator 12, the other end is connected to the auxiliary reversing reservoir 50, one end of the second reservoir solenoid valve 52 is connected to the auxiliary reversing reservoir 50, and the other end is connected to a communication pipeline between the user heat exchanger 20 and the air source heat exchanger 40. The combination switch of the first liquid storage solenoid valve 51 and the second liquid storage solenoid valve 52 is controlled by control logic to realize the storage and migration of the refrigerant in the auxiliary reversing liquid storage device 50, so that the stability of the system performance of the double-source heat pump air conditioning unit when the air source or water source heating mode is switched is ensured, and the problems of refrigerant matching and stability influenced by the difference of heat exchange forms, parameters or working conditions of evaporators and the difference of requirements on the circulation quantity of the refrigerant are avoided. For example, when the air source-side accumulator 41 is insufficient to store the surplus refrigerant on the communication line between the user heat exchanger 20 and the air source heat exchanger 40, or when the refrigerant needs to be reserved for the subsequent forced migration during the operation, the refrigerant may be stored in the auxiliary reversing accumulator 50 by opening the second reservoir solenoid valve 52 and closing the first reservoir solenoid valve 51. For another example, when the air source heating mode is switched to the water source heating mode, the second liquid storage solenoid valve 52 is closed, and the first liquid storage solenoid valve 51 is opened, so that the redundant refrigerant stored in the auxiliary reversing liquid storage device 50 in the air source heating mode can be discharged into the system, and the problem of low-pressure shutdown caused by large refrigerant circulation amount and insufficient system refrigerant when the water source heating mode is operated is solved. For another example, when the dual-source heat pump air conditioning unit reaches the set temperature and pressure values during operation, the first liquid storage solenoid valve 51 and the second liquid storage solenoid valve 52 are closed, and the auxiliary reversing liquid storage 50 may suspend storing and transferring the refrigerant.
In this embodiment, referring to fig. 1, under the cooperative adjustment of the water source side direction control valve, the air source side direction control valve and the dual four-way valve assembly, the dual-source heat pump air conditioning unit can be adjusted to operate in any one of a water source cooling mode, a water source heating mode, an air source cooling mode and an air source heating mode. The user heat exchanger 20, the water source heat exchanger 30 and the air source heat exchanger 40 are respectively and selectively communicated with the heat pump driving mechanism 1 through the matching of the heat source four-way valve 13 and the cold and hot four-way valve 14, so that the free selection of two different forms of heat exchange of a water source or an air source is realized. Meanwhile, the water source heat exchanger 30 is switched between the water source cooling mode and the water source heating mode under the cooperation of the water source side electromagnetic valve 33 and the water source side check valve 34, and the air source heat exchanger 40 is switched between the air source cooling mode and the air source heating mode under the cooperation of the air source side electromagnetic valve 43 and the air source side check valve 44. The advantage of utilizing water source heat pump and air source heat pump in a unit is exerted, the heat exchange mode of condensation and evaporation side heat exchanger is freely switched according to the use demand and the environmental condition, the heat exchanger is suitable for different use environments, and the operation energy efficiency is improved.
Specifically, referring to fig. 1, four ports of the heat source four-way valve 13 are respectively labeled as port E, port S, port C, and port D, and four ports of the hot and cold four-way valve 14 are respectively labeled as port D, port E, port S, and port C.
Further, in the water source cooling mode and the water source heating mode, the user heat exchanger 20 is simultaneously operated with the water source heat exchanger 30 in correspondence to the heat source four-way valve 13, the cooling and heating four-way valve 14, the water source side solenoid valve 33, the water source side check valve 34, the air source side solenoid valve 43, and the air source side check valve 44, and the air source heat exchanger 40 is stopped and is communicated with the gas-liquid separator 12.
Specifically, referring to fig. 1, in the water source refrigeration mode, the refrigerant runs through the pipeline in the following way, the high-temperature and high-pressure gaseous refrigerant coming out of the exhaust port of the compressor 11 passes through the ports D and C of the cold and hot four-way valve 14, then passes through the ports D and C of the heat source four-way valve 13, enters the water source heat exchanger 30, the refrigerant exchanges heat with water in the water source heat exchanger 30, the high-temperature and high-pressure liquid refrigerant coming out after condensation heat exchange passes through the water source side reservoir 31, the redundant refrigerant is stored in the water source side reservoir 31, the residual refrigerant is throttled by the water source side electronic expansion valve 32 to become low-temperature and low-pressure gas-liquid mixed refrigerant, then enters the user heat exchanger 20 through the water source side check valve 34, the low-temperature and low-pressure gas-liquid mixed refrigerant exchanges heat with water in the user heat exchanger 20, the low-temperature and low-pressure, and then enters the compressor 11 for the next refrigeration cycle. In this process, the air source side solenoid valve 43 is in a closed state, the air source heat exchanger 40 does not exchange heat with air, the air source heat exchanger 40 is connected to the ports E and S of the heat source four-way valve 13 and the inlet of the gas-liquid separator 12, and the refrigerant returns to the compressor 11 again for circulation.
Specifically, referring to fig. 1, in the water source heating mode, the refrigerant runs in the pipeline through a path that a high-temperature and high-pressure gaseous refrigerant coming out of an exhaust port of the compressor 11 passes through the port D of the four-way cold-hot valve 14, at which time the four-way cold-hot valve 14 is electrically switched, the high-temperature and high-pressure gaseous refrigerant enters the user heat exchanger 20 through the port E of the four-way cold-hot valve 14, the refrigerant exchanges heat with water in the water source heat exchanger 30, the high-temperature and high-pressure liquid refrigerant coming out after condensation heat exchange passes through the air source-side accumulator 41, the redundant refrigerant is stored in the air source-side accumulator 41, the residual refrigerant passes through the water source-side solenoid valve 33 and then throttled by the water source-side electronic expansion valve 32 to become a low-temperature and low-pressure gas-liquid mixed refrigerant, and when passing through, but enters the water source heat exchanger 30, the refrigerant absorbs the heat of water in the water source heat exchanger 30 and is evaporated into a low-temperature and low-pressure gaseous refrigerant, and then the low-temperature and low-pressure gaseous refrigerant passes through the port C and the port S of the heat source four-way valve 13, enters the gas-liquid separator 12, and returns to the compressor 11 to perform the next heating cycle. In this process, the air source side solenoid valve 43 is in a closed state, the air source heat exchanger 40 does not exchange heat with air, the air source heat exchanger 40 communicates with the ports E and D of the heat source four-way valve 13, and is connected to the ports C and S of the cold and hot four-way valve 14 and the inlet of the gas-liquid separator 12, and the refrigerant returns to the compressor 11 again to circulate.
Further, in the air-source cooling mode and the air-source heating mode, the user heat exchanger 20 is simultaneously operated with the air-source heat exchanger 40 in correspondence with the heat-source four-way valve 13, the cold-hot four-way valve 14, the water-source-side electromagnetic valve 33, the water-source-side check valve 34, the air-source-side electromagnetic valve 43, and the air-source-side check valve 44, and the water-source heat exchanger 30 is stopped and is communicated with the gas-liquid separator 12.
Specifically, referring to fig. 1, in the air source cooling mode, the refrigerant runs through the pipeline in the following way, the high-temperature and high-pressure gaseous refrigerant coming out of the exhaust port of the compressor 11 passes through the ports D and C of the cold and hot four-way valve 14, then passes through the port D of the heat source four-way valve 13, at this time, the heat source four-way valve 13 is electrically reversed, the refrigerant enters the air source heat exchanger 40 through the port E of the heat source four-way valve 13, the refrigerant releases heat to the air in the air source heat exchanger 40, the condensed high-temperature and high-pressure liquid refrigerant is throttled by the air source side electronic expansion valve 42 to become a low-temperature and low-pressure gas-liquid mixed refrigerant, then enters the user heat exchanger 20 through the air source side check valve 44, the low-temperature and low-pressure gas-liquid mixed refrigerant exchanges heat with the seawater in the user heat, and then enters the compressor 11 to perform the next refrigeration cycle. In this process, the water source side solenoid valve 33 is in a closed state, the water source heat exchanger 30 does not exchange heat with water, the water source side accumulator 31 is connected to the port C and the port S of the heat source four-way valve 13 and the inlet of the gas-liquid separator 12 at the same time, and the refrigerant returns to the compressor 11 again for circulation.
Specifically, referring to fig. 1, in the air source heating mode, the refrigerant runs in the pipeline through a path that a high-temperature and high-pressure gaseous refrigerant coming out of an exhaust port of the compressor 11 passes through the port D of the four-way valve 14, at this time, the four-way valve 14 is powered to reverse, the high-temperature and high-pressure gaseous refrigerant passes through the port E of the four-way valve 14 and enters the user heat exchanger 20, the refrigerant exchanges heat with water in the user heat exchanger 20, the high-temperature and high-pressure liquid refrigerant coming out after condensation and heat exchange passes through the air source side accumulator 41, the redundant refrigerant is stored in the air source side accumulator 41, the residual refrigerant passes through the air source side solenoid valve 43 and then is throttled by the air source side electronic expansion valve 42 to become a low-temperature and low-pressure gas-liquid mixed refrigerant, and enters the air, passes through ports E and S of the heat source four-way valve 13, then enters the gas-liquid separator 12, and then returns to the compressor 11 to perform the next heating cycle. In this process, the water source side solenoid valve 33 is in a closed state, the water source heat exchanger 30 does not exchange heat with water, the water source side reservoir 31 is communicated with the ports C and D of the heat source four-way valve 13, and is connected with the ports C and S of the cold and hot four-way valve 14 and the inlet of the gas-liquid separator 12, and the refrigerant returns to the compressor 11 again to circulate.
Optionally, the number of the household heat exchangers 20, the number of the water source heat exchangers 30 and the number of the air source heat exchangers 40 may be multiple, so that more than three heat exchangers can be freely combined, and the heat exchanger can be applied to more working conditions.
Optionally, a plurality of heat source four-way valves 13, a plurality of cold and hot four-way valves 14, a plurality of water source side electromagnetic valves 33, a plurality of water source side check valves 34, a plurality of air source side electromagnetic valves 43, and a plurality of air source side check valves 44 may be respectively arranged, so as to realize a water source heat pump refrigeration mode, a water source heating mode, an air source refrigeration mode, and a heating air source mode, and simultaneously, the heat source heat pump refrigeration mode, the water source heating mode.
Optionally, when the dual-source heat pump air conditioning unit operates in any one of a water source cooling mode, a water source heating mode, an air source cooling mode and an air source heating mode, the dual-source heat pump air conditioning unit can be adjusted according to different environmental temperatures and water temperatures and switched to an optimal operation mode. For example, when the heating mode is operated, an environment temperature parameter T1 and a water temperature T2 are set in an air source heating mode or a water source heating mode, and when the environment temperature is higher than T1 and the water temperature T2 is higher than 5 ℃, the water source heating mode is preferentially adopted, so that high energy efficiency is ensured; when the ambient temperature is less than T1 and the water temperature T2<5 ℃, the air source heating mode is preferentially used. Particularly, when the ambient temperature T1< -5 ℃, the air source heating mode is preferentially used and the electronic expansion valve 15 is used for auxiliary cooling, so that the overhigh exhaust temperature of the low-temperature operation compressor 11 is avoided, and the stable operation of the air source heating mode is ensured.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (10)

1. A dual source heat pump air conditioning unit, comprising:
the heat pump driving mechanism (1), the heat pump driving mechanism (1) comprises a compressor (11) and a gas-liquid separator (12) communicated with the compressor (11);
the user heat exchanger (20) is communicated with the heat pump driving mechanism (1) through a double four-way valve assembly, and the double four-way valve assembly comprises a heat source four-way valve (13) and a cold and hot four-way valve (14) which are communicated with each other;
one end of the water source heat exchanger (30) is communicated with the heat pump driving mechanism (1) through the double four-way valve assembly, and the other end of the water source heat exchanger (30) is communicated with the user heat exchanger (20) through a water source side direction control valve;
one end of the air source heat exchanger (40) is communicated with the heat pump driving mechanism (1) through the double four-way valve assembly, and the other end of the air source heat exchanger (40) is communicated with the user heat exchanger (20) through an air source side direction control valve;
and the auxiliary reversing liquid storage device (50) is used for storing redundant refrigerant, one end of the auxiliary reversing liquid storage device (50) is communicated with the gas-liquid separator (12) through a first liquid storage electromagnetic valve (51), and the other end of the auxiliary reversing liquid storage device is communicated with the user heat exchanger (20) through a second liquid storage electromagnetic valve (52).
2. The dual-source heat pump air conditioning unit according to claim 1, wherein one port of the hot and cold four-way valve (14), one port of the air source heat exchanger (40), one port of the water source heat exchanger (30), and one port of the gas-liquid separator (12) are connected to four ports of the heat source four-way valve (13), respectively, and one port of the heat source four-way valve (13), one port of the user heat exchanger (20), the other port of the gas-liquid separator (12), and the compressor (11) are connected to four ports of the hot and cold four-way valve (14), respectively.
3. Double source heat pump air conditioning unit according to claim 2, characterized in that an electronic expansion valve (15) is provided between the compressor (11) and the other port of the user heat exchanger (20).
4. The dual-source heat pump air conditioning unit according to claim 1, wherein the water source side directional control valve comprises a water source side solenoid valve (33) and a water source side check valve (34), and the water source side solenoid valve (33) and the water source side check valve (34) are arranged in parallel on a communication line between the water source heat exchanger (30) and the user heat exchanger (20).
5. The dual-source heat pump air conditioning unit according to claim 4, wherein the water source-side directional control valve further comprises a water source-side electronic expansion valve (32), the water source-side electronic expansion valve (32) being disposed on a communication line between the water source heat exchanger (30) and the user heat exchanger (20), between the water source heat exchanger (30) and the water source-side check valve (34).
6. The dual-source heat pump air conditioning unit according to claim 5, wherein a water source side accumulator (31) is provided on a communication line between the water source heat exchanger (30) and the user heat exchanger (20), the water source side accumulator (31) being located between the water source heat exchanger (30) and the water source side electronic expansion valve (32).
7. The dual-source heat pump air conditioning unit according to claim 1, wherein the air-source-side directional control valve includes an air-source-side solenoid valve (43) and an air-source-side check valve (44), the air-source-side solenoid valve (43) and the air-source-side check valve (44) being disposed in parallel on a communication line between the air-source heat exchanger (40) and the user heat exchanger (20).
8. The dual-source heat pump air conditioning unit according to claim 7, wherein said air-source-side directional control valve further comprises an air-source-side electronic expansion valve (42), said air-source-side electronic expansion valve (42) being disposed on a communication line between said air-source heat exchanger (40) and said user heat exchanger (20), between said air-source heat exchanger (40) and said air-source-side check valve (44).
9. The dual-source heat pump air conditioning unit according to claim 8, characterized in that an air-source-side accumulator (41) is provided on a communication pipe between the user heat exchanger (20) and the air-source heat exchanger (40), the air-source-side accumulator (41) being located between the user heat exchanger (20) and the air-source-side solenoid valve (43), the second accumulator solenoid valve (52) being provided on a communication pipe between the air-source-side accumulator (41) and the first accumulator solenoid valve (51).
10. The dual-source heat pump air conditioning unit as claimed in any one of claims 1 to 9, wherein under the cooperative adjustment of the water source side directional control valve, the air source side directional control valve and the dual four-way valve assembly, the dual-source heat pump air conditioning unit can be adjusted to operate in any one of a water source cooling mode, a water source heating mode, an air source cooling mode and an air source heating mode;
in the water source cooling mode and the water source heating mode, the user heat exchanger (20) and the water source heat exchanger (30) correspondingly operate at the same time, and the air source heat exchanger (40) stops operating and is communicated with the gas-liquid separator (12);
in the air source cooling mode and the air source heating mode, the user heat exchanger (20) correspondingly operates simultaneously with the air source heat exchanger (40), and the water source heat exchanger (30) stops operating and is communicated with the gas-liquid separator (12).
CN202011272965.8A 2020-11-13 2020-11-13 Double-source heat pump air conditioning unit Pending CN112212538A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011272965.8A CN112212538A (en) 2020-11-13 2020-11-13 Double-source heat pump air conditioning unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011272965.8A CN112212538A (en) 2020-11-13 2020-11-13 Double-source heat pump air conditioning unit

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CN112212538A true CN112212538A (en) 2021-01-12

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113446681A (en) * 2021-06-07 2021-09-28 江苏大学 Ground source heat pump composite system for buildings in cold regions and control method thereof
CN113720036A (en) * 2021-08-30 2021-11-30 广州大学 Multifunctional double-source heat pump system and control method thereof
CN115468329A (en) * 2022-09-13 2022-12-13 约克广州空调冷冻设备有限公司 Heat pump system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113446681A (en) * 2021-06-07 2021-09-28 江苏大学 Ground source heat pump composite system for buildings in cold regions and control method thereof
CN113446681B (en) * 2021-06-07 2022-09-16 江苏大学 Ground source heat pump composite system for buildings in cold regions and control method thereof
CN113720036A (en) * 2021-08-30 2021-11-30 广州大学 Multifunctional double-source heat pump system and control method thereof
CN115468329A (en) * 2022-09-13 2022-12-13 约克广州空调冷冻设备有限公司 Heat pump system
CN115468329B (en) * 2022-09-13 2023-10-13 约克广州空调冷冻设备有限公司 heat pump system

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