CN113803814A - Multi-split air conditioner system with hot water and control method thereof - Google Patents

Multi-split air conditioner system with hot water and control method thereof Download PDF

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Publication number
CN113803814A
CN113803814A CN202110995798.8A CN202110995798A CN113803814A CN 113803814 A CN113803814 A CN 113803814A CN 202110995798 A CN202110995798 A CN 202110995798A CN 113803814 A CN113803814 A CN 113803814A
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China
Prior art keywords
heat exchanger
hot water
refrigerant
water
preparation
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Pending
Application number
CN202110995798.8A
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Chinese (zh)
Inventor
武连发
冯涛
焦华超
高晗
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Gree Green Refrigeration Technology Center Co Ltd of Zhuhai
Zhuhai Gree Energy Saving Environmental Protection Refrigeration Technology Research Center Co Ltd
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Gree Green Refrigeration Technology Center Co Ltd of Zhuhai
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Priority to CN202110995798.8A priority Critical patent/CN113803814A/en
Publication of CN113803814A publication Critical patent/CN113803814A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
    • F24F5/001—Compression cycle type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/30—Arrangement or mounting of heat-exchangers
    • 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
    • F25B29/00—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously
    • F25B29/003—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously of the compression type system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • 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
    • F25B41/31—Expansion valves
    • F25B41/325—Expansion valves having two or more valve members
    • 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
    • F25B41/31—Expansion valves
    • F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
    • 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
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F24F2110/12—Temperature of the outside air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2221/00—Details or features not otherwise provided for
    • F24F2221/54—Heating and cooling, simultaneously or alternatively
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/07—Exceeding a certain pressure value in a refrigeration component or 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/17—Speeds
    • F25B2700/171—Speeds of the compressor
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2106—Temperatures of fresh outdoor air
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2115—Temperatures of a compressor or the drive means therefor
    • F25B2700/21152—Temperatures of a compressor or the drive means therefor at the discharge side of the compressor
    • 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]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Signal Processing (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Power Engineering (AREA)
  • Analytical Chemistry (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Human Computer Interaction (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)

Abstract

The invention relates to a multi-split system with hot water and a control method thereof, wherein the multi-split system comprises a refrigeration loop, a channel communicated between a compressor and an outdoor heat exchanger is a first refrigerant channel, and a channel communicated between the outdoor heat exchanger and an indoor heat exchanger is a second refrigerant channel; the second heat exchange channel of the hot water heat exchanger is externally connected to the water flow circulating system; the first auxiliary passage is communicated with an inlet of a first heat exchange channel of the hot water heat exchanger and a first refrigerant passage, and a liquid storage device is arranged on the first auxiliary passage; and the second auxiliary passage is communicated with the outlet of the first heat exchange channel and the second refrigerant passage, and a second throttling element is arranged on the second auxiliary passage. When the high pressure of the refrigeration circuit is about to be too high, part of the refrigerant can be distributed to the first auxiliary passage to reduce the temperature and the pressure of the refrigerant in the system, and the continuity of refrigeration is ensured.

Description

Multi-split air conditioner system with hot water and control method thereof
Technical Field
The invention relates to the technical field of air conditioners, in particular to a multi-split air conditioner system with hot water and a control method thereof.
Background
The multi-split system with hot water is a system which can refrigerate and cool the indoor space and can also heat water in the water flow circulating system by using the heat of the high-temperature and high-pressure refrigerant in the refrigerating circuit, thereby providing hot water for users. The system has the advantages of saving resources and simplifying the system while meeting the functional diversity. One system meets various requirements of users and is widely applied to public places such as hospitals, schools, markets and the like. The condition that the high pressure is too high exists in the refrigeration circuit in the operation process, if this condition appears, the system can carry out power-off protection, leads to the refrigeration process to be unable to carry out continuously.
Disclosure of Invention
The invention provides a multi-split system with hot water and a control method thereof, aiming at the problem that the refrigeration process cannot be carried out continuously, so as to effectively guarantee the continuity of the refrigeration process.
A multiple on-line system with hot water, comprising:
the refrigerating circuit comprises a compressor, an outdoor heat exchanger, a first throttling element and an indoor heat exchanger which are mutually communicated, a channel communicated between a refrigerant outlet of the compressor and the outdoor heat exchanger is a first refrigerant channel, and a channel communicated between the outdoor heat exchanger and the indoor heat exchanger is a second refrigerant channel;
the hot water heat exchanger is provided with a first heat exchange channel and a second heat exchange channel, the second heat exchange channel is externally connected to a water flow circulating system, and a water flow driving piece is arranged on the water flow circulating system and used for driving cold water in the water flow circulating system to continuously pass through the hot water heat exchanger to absorb heat;
the first auxiliary passage is communicated with the inlet of the first heat exchange channel and the first refrigerant passage, and a liquid storage device is arranged on the first auxiliary passage;
and the second auxiliary passage is communicated with the outlet of the first heat exchange channel and the second refrigerant passage, and a second throttling element is arranged on the second auxiliary passage.
According to the scheme, when the refrigerating loop is about to have overhigh high pressure in the operation process, part of the refrigerant can be distributed to the first auxiliary passage and then enters the hot water heat exchanger to exchange heat with water in the water flow circulating system for cooling, and meanwhile, part of the high-temperature and high-pressure refrigerant can be stored in the liquid storage device in the process, so that the temperature and the pressure of the refrigerant in the multi-split air-conditioning system with hot water are integrally reduced, and the condition that the refrigerating continuity is influenced due to high-pressure protection of the system is avoided.
In one embodiment, the water flow circulation system comprises a water storage part, a water inlet and a water outlet of the water storage part are respectively communicated with openings at two ends of the second heat exchange channel, and the water flow driving part is used for driving water in the water flow circulation system to circularly flow between the water storage part and the second heat exchange channel.
In one embodiment, the first throttling element includes an outdoor electronic expansion valve and an indoor electronic expansion valve both disposed on the second refrigerant passage, the outdoor electronic expansion valve is located between the outdoor heat exchanger and the second auxiliary passage, and the indoor electronic expansion valve is located between the second auxiliary passage and the indoor heat exchanger;
and/or, the second throttling element comprises an electronic expansion valve.
In one embodiment, a check valve is further disposed on the first auxiliary passage, and a flow direction of the check valve is from the first refrigerant passage to the first heat exchange channel along the first auxiliary passage.
In one embodiment, a passage communicated between the indoor heat exchanger and the compressor is a third refrigerant passage;
the multi-split system with the hot water also comprises a third auxiliary passage, and the third auxiliary passage is communicated between the first refrigerant passage and the third refrigerant passage;
a four-way valve is arranged at the communication position of the third auxiliary passage and the first refrigerant passage, or a first switch valve is arranged on the first refrigerant passage and is positioned between the first auxiliary passage and the third auxiliary passage, and a second switch valve is arranged on the third auxiliary passage.
In one embodiment, a gas-liquid separator is disposed on the third refrigerant passage, and the gas-liquid separator is located between the compressor and the third auxiliary passage;
and/or a third switching valve is arranged on the third refrigerant passage and is positioned between the third auxiliary passage and the indoor heat exchanger.
A control method of a multi-split air conditioning system with hot water comprises the following steps:
when the condition that a refrigeration loop in the multi-split system with hot water is about to enter a high-pressure and overhigh state is obtained, a water flow driving piece in a water flow circulating system is started;
the water flow circulating system passes through the hot water heat exchanger, and the water flow driving piece can drive cold water in the water flow circulating system to continuously pass through the hot water heat exchanger to absorb heat;
the high-temperature and high-pressure refrigerant output by the compressor is subjected to shunting treatment, so that a part of refrigerant enters an indoor heat exchanger after being subjected to heat exchange through an outdoor heat exchanger, and the other part of refrigerant enters the indoor heat exchanger after being subjected to heat exchange with cold water in the water flow circulating system in the hot water heat exchanger.
According to the control method of the multi-split system with hot water, when the condition that the refrigerating circuit is about to enter the high-pressure and overhigh-pressure state is obtained, the water flow driving piece is started, and the high-temperature and high-pressure refrigerant output by the compressor is shunted, so that the high-temperature and high-pressure refrigerant can be partially cooled with cold water in the water flow circulating system, the temperature of the refrigerant finally entering the indoor heat exchanger is reduced, the refrigerating circuit is prevented from entering high-pressure protection as much as possible, and the continuity of the refrigerating process is ensured.
In one embodiment, the step of acquiring that a refrigeration circuit in the multi-split air-conditioning system with hot water is about to enter a high-pressure and high-pressure state specifically includes the following steps:
acquiring a high-pressure temperature T1 in the refrigeration loop, an outdoor environment temperature T2 where an outdoor heat exchanger and a compressor are located, a discharge temperature T3 of the compressor, an operating frequency X1 of the compressor and an operating frequency X2 of the outdoor heat exchanger;
if T1 is more than or equal to T1Preparation of，T2≥T2Preparation of，T3≥T31Preparation of，X1≤X1Preparation ofAnd X2 is more than or equal to X2Preparation ofWherein T1Preparation ofAt a predetermined saturation temperature corresponding to the high pressure of the refrigeration circuit, T2Preparation ofFor a preset outdoor ambient temperature, T31Preparation ofFirst discharge temperature of compressor, X1Preparation ofX2 being the lowest operating frequency allowed by the compressorPreparation ofThe maximum allowable operating frequency of the outdoor heat exchanger;
the refrigeration circuit is about to enter a high pressure, too high state.
In one embodiment, after the water flow driving member is started and the high-temperature and high-pressure refrigerant output by the compressor is subjected to the split-flow processing, the method further includes the following steps:
s1, detecting a high-pressure temperature T1 in the refrigeration circuit, a discharge temperature T3 of the compressor and an air outlet temperature T4 of an outdoor unit of the refrigeration circuit;
if T1 < T1Preparation of，T3≤T32Preparation ofOr T4 ≧ T4Preparation ofWherein T32Preparation ofFor a preset second discharge temperature of the compressor, T32Preparation of＜T31Preparation of，T4Preparation ofThe air outlet temperature of the outdoor unit of the refrigeration loop is preset;
judging whether the time length for repeating the step S1 reaches a preset time length delta T;
if the time for repeating the steps reaches a preset time delta T, closing the water flow driving piece, and stopping shunting the high-temperature and high-pressure refrigerant output by the compressor;
and if the time length for repeating the steps does not reach the preset time length delta T, repeating the step S1.
A control method of a multi-split system with hot water is provided, wherein the single-cooling multi-split system comprises the multi-split system with hot water, and the control method comprises the following steps:
and when the refrigerating circuit in the multi-split system with hot water is about to enter a high-pressure and overhigh state, starting the water flow driving piece and the second throttling element, and starting the liquid storage device.
The above-mentioned scheme provides a control method of a single-cold cross-linking system, which is used for controlling the single-cold cross-linking system described in any embodiment, and when it is obtained that a refrigeration loop is about to enter a high-pressure and over-high state, the water flow driving member and the second throttling element are started, and the liquid storage device is started, so that on one hand, a high-temperature and high-pressure refrigerant output from the compressor can exchange heat and cool at the hot water heat exchanger, and on the other hand, the liquid storage device can store part of the refrigerant, thereby reducing the pressure and temperature of the refrigerant in the system as a whole, effectively preventing the system from entering a high-pressure protection mode, and ensuring the continuity of the refrigeration process.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1, 3 and 5 are system diagrams of a multi-split system with hot water according to the embodiment in different modes;
fig. 2, 4 and 6 are system diagrams of a multi-split system with hot water in different modes in another embodiment;
fig. 7 is a flowchart illustrating a control method of the multi-split system with hot water according to the present embodiment;
fig. 8 is a flowchart of a control method of a multi-split system with hot water according to another embodiment;
fig. 9 is a flowchart of a control method of a multi-split system with hot water according to still another embodiment.
Description of reference numerals:
10. a multi-split system with hot water; 11. a compressor; 12. an outdoor heat exchanger; 13. an indoor heat exchanger; 14. a hot water heat exchanger; 15. a water flow circulation system; 151. a water flow driving member; 152. a water storage member; 16. a four-way valve; 20. a first refrigerant passage; 21. a first on-off valve; 30. a second refrigerant passage; 31. an outdoor unit electronic expansion valve; 32. an internal machine electronic expansion valve; 40. a first auxiliary passage; 41. a reservoir; 42. a one-way valve; 50. a second auxiliary path; 51. a second throttling element; 60. a third refrigerant passage; 61. a gas-liquid separator; 62. a third on-off valve; 70. a third auxiliary path; 71. and a second on-off valve.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
As shown in fig. 1 to 6, in one embodiment, there is provided a hot water multi-on-line system 10, including:
the refrigeration system comprises a refrigeration loop, a first refrigerant loop and a second refrigerant loop, wherein the refrigeration loop comprises a compressor 11, an outdoor heat exchanger 12, a first throttling element and an indoor heat exchanger 13 which are mutually communicated, a channel communicated between a refrigerant outlet of the compressor 11 and the outdoor heat exchanger 12 is a first refrigerant channel 20, and a channel communicated between the outdoor heat exchanger 12 and the indoor heat exchanger 13 is a second refrigerant channel 30;
the heat exchanger 14 comprises a first heat exchange channel and a second heat exchange channel, the first heat exchange channel and the second heat exchange channel are arranged in the heat exchanger 14, the second heat exchange channel is externally connected to a water flow circulating system 15, and a water flow driving piece 151 is arranged on the water flow circulating system 15 and used for driving cold water in the water flow circulating system 15 to continuously pass through the heat exchanger 14 to absorb heat;
a first auxiliary passage 40, wherein the first auxiliary passage 40 communicates the inlet of the first heat exchange channel with the first refrigerant passage 20;
and a second auxiliary passage 50, wherein the second auxiliary passage 50 communicates the outlet of the first heat exchange channel with the second refrigerant passage 30, and a second throttling element 51 is disposed on the second auxiliary passage 50.
When the outdoor temperature is continuously high, the heat exchange process of the outdoor heat exchanger 12 cannot be effectively performed, if the situation that the high pressure in the refrigeration circuit is too high occurs in the past, in order to ensure that the compressor 11 can normally operate, the high pressure protection is performed on the general refrigeration circuit when the situation that the high pressure is too high occurs, the refrigeration of the system is stopped, and the continuity cannot be realized in the refrigeration process. Based on the above scheme, the multi-split air-conditioning system 10 with hot water is provided, when the condition of overhigh high pressure is about to occur in the operation process of the refrigeration loop, a part of refrigerant can be distributed to the first auxiliary passage 40, and then enters the hot water heat exchanger 14 to exchange heat with water in the water flow circulation system 15 for cooling, so that the temperature and pressure of the refrigerant in the multi-split air-conditioning system 10 with hot water are integrally reduced, and the condition that the refrigeration continuity is influenced due to high-pressure protection of the system is avoided.
Further, as shown in fig. 1 to 6, a liquid reservoir 41 is disposed on the first auxiliary passage 40, and the liquid reservoir 41 can store a part of the refrigerant, so as to further reduce the pressure of the refrigerant in the system, and avoid the interruption of the refrigeration process when the system enters a high-pressure protection mode.
Further, in an embodiment, the liquid storage amount of the liquid storage tank 41 is adjustable, so that the amount of the refrigerant stored in the liquid storage tank 41 can be flexibly adjusted according to the pressure condition of the refrigerant in the system.
Specifically, the water flow circulation system 15 is a water flow system capable of continuously feeding cold water into the second heat exchange channel of the hot water heat exchanger 14 under the action of the water flow driving member 151.
For example, in one embodiment, as shown in fig. 1 to 6, the water circulation system 15 includes a water storage member 152, a water inlet and a water outlet of the water storage member 152 are respectively communicated with openings at two ends of the second heat exchange channel, and the water flow driving member 151 is configured to drive water in the water circulation system 15 to circulate between the water storage member 152 and the second heat exchange channel, so as to continuously absorb heat of the refrigerant in the first heat exchange channel.
And the hot water in the water storage member 152 can be used by the user on one hand, and on the other hand, can also be used as a heat source of components and parts which release heat to the outside, such as a floor heating system.
After the cold water in the water flow circulation system 15 exchanges heat in the second heat exchange channel and is changed into hot water, the hot water can be continuously injected into the water flow circulation system 15 while being conveyed to a user for use, so that the balance of the water amount in the water flow circulation system 15 is realized.
More specifically, the water flow driving member 151 may be a water pump, or may be another driving member capable of providing power for water flow.
Further, as shown in fig. 1 to 6, in one embodiment, a passage communicating between the indoor heat exchanger 13 and the compressor 11 is a third refrigerant passage 60;
the multi-split system 10 with hot water further includes a third auxiliary passage 70, and the third auxiliary passage 70 is communicated between the first refrigerant passage 20 and the third refrigerant passage 60;
a four-way valve 16 is provided at a communication portion between the third auxiliary passage 70 and the first refrigerant passage 20.
As shown in fig. 1, when the multi-split air-conditioning system 10 with hot water enters the single cooling mode, the four-way valve 16 is switched to a state in which the first refrigerant passage is turned on and the third auxiliary passage 70 is turned off. At this time, the high-temperature and high-pressure refrigerant output from the compressor 11 mainly enters the outdoor heat exchanger 12 through the first refrigerant passage 20. The refrigerant exchanges heat in the outdoor heat exchanger 12 to reduce the temperature, and the cooled refrigerant passes through the first throttling element and then reaches the indoor heat exchanger 13 to exchange heat and absorb indoor heat, so that the refrigeration effect is achieved. The refrigerant after heat exchange and heat absorption in the indoor heat exchanger 13 flows back to the compressor 11 to form a circulation loop. At this time, the second throttling element 51 is in a closed state, and the refrigerant cannot flow through the hot water heat exchanger 14.
In the process of refrigeration, if the refrigeration circuit is about to enter a high-pressure protection state due to an excessively high outdoor temperature, the second throttling element 51 and the water flow driving element 151 may be turned on, as shown in fig. 3, so that a high-temperature and high-pressure refrigerant output from the compressor 11 may partially flow to the hot water heat exchanger 14 to exchange heat with cold water in the water flow circulation system 15, and meanwhile, the liquid reservoir 41 may store a part of the refrigerant, thereby reducing the pressure of the refrigerant in the system. The condition that the refrigeration process is interrupted due to high-pressure protection of the system is avoided.
When the multi-split air-conditioning system 10 with hot water enters the cooling and heating mode, the state of the four-way valve 16 is the same as that when the system enters the single cooling mode, and at this time, the first throttling element, the second throttling element 51 and the water flow driving member 151 are all in the open state. Specifically, as shown in fig. 3, a part of the high-temperature and high-pressure refrigerant output from the compressor 11 flows into the outdoor heat exchanger 12, and the other part flows into the hot water heat exchanger 14. It should be noted that the refrigerant flow direction in the cooling and heating mode is similar to the refrigerant flow direction after the second throttling element 51 and the water flow driving member 151 are opened in the single cooling mode to enter the high-pressure protection state. However, in the cooling + heating mode, the accumulator 41 does not need to store the refrigerant unless there is a high-pressure protection problem.
As shown in fig. 5, it is assumed that two water ports of the four-way valve 16, which are communicated with the first refrigerant passage 20, are a first water port and a second water port, respectively, a passage section of the first refrigerant passage 20, which is communicated between the four-way valve 16 and the outdoor heat exchanger 12, is a first refrigerant channel B, and a water port of the four-way valve 16, which is communicated with the first refrigerant channel B, is the second water port. When the heating mode is entered, the four-way valve 16 is switched to a state in which the second water port and the third auxiliary passage 70 are connected, and the first water port is blocked. Both the second restriction element 51 and the water drive 151 are activated. The high-temperature and high-pressure refrigerant output by the compressor 11 mainly enters the hot water heat exchanger 14 for heat exchange, so that cold water in the water flow circulating system 15 absorbs heat and is heated. The refrigerant having dissipated heat in the hot water heat exchanger 14 passes through the second throttling element 51 and the outdoor heat exchanger 12 in sequence, and then returns to the refrigerant inlet of the compressor 11 through the four-way valve 16.
Or in another embodiment, as shown in fig. 2, 4 and 6, a first on-off valve 21 is disposed on the first refrigerant passage 20, the first on-off valve 21 is located between the first auxiliary passage 40 and the third auxiliary passage 70, and a second on-off valve 71 is disposed on the third auxiliary passage 70.
Therefore, the switching of the refrigerant flow direction of the multi-split system 10 with hot water in different modes is mainly controlled by the on/off of the first switch valve 21 and the second switch valve 71.
In the single cooling mode, as shown in fig. 2, the first on-off valve 21 and the first throttling element are opened, the second on-off valve 71, the second throttling element 51 and the water flow driving member 151 are all closed, and the high-temperature and high-pressure refrigerant output by the compressor 11 sequentially passes through the outdoor heat exchanger 12, the first throttling element and the indoor heat exchanger 13 and then flows back to the compressor 11.
However, if the high-pressure protection problem occurs in the cooling mode, the second throttling element 51 and the water flow driving element 151 are opened, so that part of the refrigerant can flow to the first auxiliary passage 40, pass through the accumulator 41 and the hot water heat exchanger 14, and then flow into the second refrigerant passage 30.
In the cooling + heating water mode, as shown in fig. 4, the first switching valve 21, the first throttling element, the second throttling element 51 and the water flow driving member 151 are all opened, and the second switching valve 71 is closed.
In the heating water mode, as shown in fig. 6, the first on-off valve 21 is closed, and the second on-off valve 71, the second throttling element 51 and the water current driving member 151 are opened.
Further, as shown in fig. 1 to 6, in an embodiment, a gas-liquid separator 61 is disposed on the third refrigerant passage 60, and the gas-liquid separator 61 is located between the compressor 11 and the third auxiliary passage 70.
Further, a third on/off valve 62 is provided on the third refrigerant passage 60, and the third on/off valve 62 is located between the third auxiliary passage 70 and the indoor heat exchanger 13. The third on/off valve 62 is opened in the cooling only mode and the cooling only + heating water mode, and the third on/off valve 62 is closed in the heating water mode.
More specifically, in one embodiment, as shown in fig. 1 to 6, the first throttling element includes an outdoor electronic expansion valve 31 and an indoor electronic expansion valve 32 both disposed on the second refrigerant passage 30, the outdoor electronic expansion valve 31 is located between the outdoor heat exchanger 12 and the second auxiliary passage 50, and the indoor electronic expansion valve 32 is located between the second auxiliary passage 50 and the indoor heat exchanger 13.
In the heating water mode, as shown in fig. 6 and 5, the outdoor unit electronic expansion valve 31 is opened, the indoor unit electronic expansion valve 32 is closed, and the refrigerant after heat exchange in the hot water heat exchanger 14 can only flow to the outdoor unit electronic expansion valve 31 and then enter the outdoor heat exchanger 12.
Further, the second throttling element 51 comprises an electronic expansion valve.
Alternatively, the first throttling element and the second throttling element 51 may also be other types of throttling elements such as capillary tubes or thermal expansion valves.
Further, as shown in fig. 1 to 6, in an embodiment, a check valve 42 is further disposed on the first auxiliary passage 40, and a flow direction of the check valve 42 is from the first refrigerant passage 20 to the first heat exchanging channel along the first auxiliary passage 40. It is further ensured that the refrigerant in the first auxiliary passage 40 can only flow from the first refrigerant passage 20 to the first heat exchange channel.
Further, as shown in fig. 7, in one embodiment, there is provided a control method of a hot water multi-online system 10, including the steps of:
when the condition that a refrigeration loop in the multi-split air-conditioning system 10 with hot water is about to enter a high-pressure and overhigh state is obtained, starting a water flow driving piece 151 in a water flow circulating system 15;
wherein, the water flow circulation system 15 passes through the hot water heat exchanger 14, and the water flow driving part 151 can drive the cold water in the water flow circulation system 15 to continuously pass through the hot water heat exchanger 14 to absorb heat;
the high-temperature and high-pressure refrigerant output by the compressor 11 is subjected to flow division processing, so that a part of the refrigerant enters the indoor heat exchanger 13 after being subjected to heat exchange by the outdoor heat exchanger 12, and the other part of the refrigerant enters the indoor heat exchanger 13 after being subjected to heat exchange with cold water in the water flow circulating system 15 in the hot water heat exchanger 14.
According to the control method of the multi-split air-conditioning system 10 with hot water, when the condition that the refrigeration loop is about to enter the high-pressure and over-high state is obtained, the water flow driving piece 151 is started, and the high-temperature and high-pressure refrigerant output by the compressor 11 is shunted, so that the high-temperature and high-pressure refrigerant can be partially cooled with cold water in the water flow circulating system 15, the temperature of the refrigerant finally entering the indoor heat exchanger 13 is reduced, the refrigeration loop is prevented from entering high-pressure protection as much as possible, and the continuity of the refrigeration process is ensured.
More specifically, in an embodiment, as shown in fig. 8, the step of entering the high-pressure and excessively high state of the refrigeration circuit in the multi-split air-conditioning system 10 acquiring the hot water includes:
acquiring a high-pressure temperature T1 in the refrigeration loop, an outdoor environment temperature T2 where an outdoor heat exchanger 12 and a compressor 11 are located, a discharge temperature T3 of the compressor 11, an operating frequency X1 of the compressor 11 and an operating frequency X2 of the outdoor heat exchanger 12;
if T1 is more than or equal to T1Preparation of，T2≥T2Preparation of，T3≥T31Preparation of，X1≤X1Preparation ofAnd X2 is more than or equal to X2Preparation ofWherein T1Preparation ofAt a predetermined saturation temperature corresponding to the high pressure of the refrigeration circuit, T2Preparation ofFor a preset outdoor ambient temperature, T31Preparation ofX1 for a preset first discharge temperature of the compressor 11Preparation ofX2 being the lowest operating frequency allowed by the compressor 11Preparation ofThe highest operating frequency allowed for the outdoor heat exchanger 12;
the refrigeration circuit is about to enter a high pressure, too high state.
When the above five conditions are all satisfied, the refrigeration circuit is proved to be limited, and the refrigerant pressure in the system cannot be controlled within an allowable range. If the system continues to operate according to the current state, the system is about to enter a high-pressure protection mode, so that the system stops refrigerating. In order to avoid the situation of high-pressure protection of the system and ensure the normal operation of the system, the water flow driving part 151 can be controlled to be started so that cold water in the water flow circulation system 15 continuously flows through the hot water heat exchanger 14. And part of the high-temperature and high-pressure refrigerant output by the system is shunted to the hot water heat exchanger 14 to exchange heat with cold water, so that the aim of reducing the temperature and pressure of the refrigerant is fulfilled.
Optionally, whether the refrigeration circuit is about to enter the high-pressure and over-high state may also be directly output by another control terminal to directly give an instruction, and if the instruction indicates that the refrigeration circuit is about to enter the high-pressure and over-high state, the water flow driving member 151 is started, and a high-temperature and high-pressure refrigerant output by the compressor is partially diverted to the hot water heat exchanger 14.
Specifically, in one embodiment, T1Preparation ofCan be at 58 ℃ and T2Preparation ofMay be at 50 ℃ T31Preparation ofCan be 108 ℃ and X1Preparation ofCan be 20HZ, X2Preparation ofMay be 60 HZ.
Further, as shown in fig. 9, in an embodiment, after the water flow driving element 151 is started and the high-temperature and high-pressure refrigerant output by the compressor 11 is subjected to the split-flow processing, the method further includes the following steps:
s1, detecting a high pressure temperature T1 in the refrigeration circuit, a discharge temperature T3 of the compressor 11 and an outlet air temperature T4 of the outdoor unit of the refrigeration circuit;
if T1 < T1Preparation of，T3≤T32Preparation ofOr T4 ≧ T4Preparation ofWherein T32Preparation ofTo a preset second discharge temperature of the compressor 11, T32Preparation of＜T31Preparation of，T4Preparation ofThe air outlet temperature of the outdoor unit of the refrigeration loop is preset;
judging whether the time length for repeating the step S1 reaches a preset time length delta T;
if the time length for repeating the above steps reaches a preset time length delta T, closing the water flow driving part 151, and stopping the flow dividing processing of the high-temperature and high-pressure refrigerant output by the compressor 11;
and if the time length for repeating the steps does not reach the preset time length delta T, repeating the step S1.
In other words, after the water flow driving unit 151 is turned on and the refrigerant output from the compressor 11 is divided, if the detection result shows that T1 is greater than T1 within the continuous preset time period Δ TPreparation of，T3≤T32Preparation ofOr T4 ≧ T4Preparation ofIt is proved that the risk of having left the high pressure protection state at this time can be stopped to control the temperature and pressure of the refrigerant by using the water circulation system 15.
Further, in a further embodiment, there is provided a control method of a hot water multi-split system 10, where the single-cold multi-split system includes the above hot water multi-split system 10, the control method includes the following steps:
when the refrigeration circuit in the multi-split system 10 with hot water is obtained to be about to enter a high-pressure and high-pressure state, the water flow driving element 151 and the second throttling element 51 are started, and the liquid accumulator 41 is opened.
According to the control method of the single-cooling cross-linking system provided by the scheme, the control method is used for controlling the multi-linking system with hot water in any embodiment, when the fact that a refrigeration loop is about to enter a high-pressure and over-high state is obtained, the water flow driving piece 151 and the second throttling element 51 are started, the liquid storage device 41 is started, on one hand, high-temperature and high-pressure refrigerants output from the compressor 11 can be subjected to heat exchange and temperature reduction at the hot water heat exchanger 14, on the other hand, the liquid storage device 41 can store partial refrigerants, so that the pressure and the temperature of the refrigerants in the system are reduced integrally, the system is effectively prevented from entering a high-pressure protection mode, and the continuity of the refrigeration process is ensured.
Similarly, the steps specifically involved in obtaining that the refrigeration circuit in the multi-split system 10 with hot water is about to enter the high-pressure and overhigh state may be similar to those described above. When the acquired high-pressure temperature T1 in the refrigeration circuit, the outdoor environment temperature T2 of the outdoor heat exchanger 12 and the compressor 11, the exhaust temperature T3 of the compressor 11, the operating frequency X1 of the compressor 11 and the operating frequency X2 of the outdoor heat exchanger 12 meet the condition that T1 is more than or equal to T1Preparation of，T2≥T2Preparation of，T3≥T31Preparation of，X1≤X1Preparation ofAnd X2 is more than or equal to X2Preparation ofUnder these five conditions, it is proved that the multi-split system 10 with hot water is about to enter a high pressure and high pressure state, and the water flow driving member 151 and the second throttling element 51 are activated, and the reservoir 41 is opened.
Further, after the water flow driving member 151 and the second throttling element 51 are started and the accumulator 41 is opened for a period of time, the temperature and pressure of the refrigerant in the refrigeration circuit are reduced. The high-pressure temperature in the refrigeration circuit can now be detected furtherT1, the discharge temperature T3 of the compressor 11 and the outlet air temperature T4 of the outdoor unit of the refrigeration circuit; if T1 < T1Preparation of，T3≤T32Preparation ofOr T4 ≧ T4Preparation ofAnd the detection results show that T1 is less than T1 in the duration time delta TPreparation of，T3≤T32Preparation ofOr T4 ≧ T4Preparation ofThe water flow drive 151, second restriction member 51 and reservoir 41 may be closed.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A multiple on-line system with hot water, comprising:
the refrigerating circuit comprises a compressor, an outdoor heat exchanger, a first throttling element and an indoor heat exchanger which are mutually communicated, a channel communicated between a refrigerant outlet of the compressor and the outdoor heat exchanger is a first refrigerant channel, and a channel communicated between the outdoor heat exchanger and the indoor heat exchanger is a second refrigerant channel;
the hot water heat exchanger is provided with a first heat exchange channel and a second heat exchange channel, the second heat exchange channel is externally connected to a water flow circulating system, and a water flow driving piece is arranged on the water flow circulating system and used for driving cold water in the water flow circulating system to continuously pass through the hot water heat exchanger to absorb heat;
the first auxiliary passage is communicated with the inlet of the first heat exchange channel and the first refrigerant passage, and a liquid storage device is arranged on the first auxiliary passage;
and the second auxiliary passage is communicated with the outlet of the first heat exchange channel and the second refrigerant passage, and a second throttling element is arranged on the second auxiliary passage.
2. A multi-split system with hot water as claimed in claim 1, wherein the water flow circulating system comprises a water storage member, a water inlet and a water outlet of the water storage member are respectively communicated with openings at two ends of the second heat exchanging channel, and the water flow driving member is configured to drive water in the water flow circulating system to circularly flow between the water storage member and the second heat exchanging channel.
3. A multi-split system with hot water as claimed in claim 1, wherein the first throttling element includes an outdoor unit electronic expansion valve and an indoor unit electronic expansion valve both disposed on the second refrigerant passage, the outdoor unit electronic expansion valve is located between the outdoor heat exchanger and the second auxiliary passage, and the indoor unit electronic expansion valve is located between the second auxiliary passage and the indoor heat exchanger;
and/or, the second throttling element comprises an electronic expansion valve.
4. A multi-split system with hot water as claimed in claim 1, wherein a check valve is further disposed on the first auxiliary passage, and a flow direction of the check valve is from the first refrigerant passage to the first heat exchange channel along the first auxiliary passage.
5. A multi-split system with hot water as claimed in any one of claims 1 to 4, wherein a passage communicating between the indoor heat exchanger and the compressor is a third refrigerant passage;
the multi-split system with the hot water also comprises a third auxiliary passage, and the third auxiliary passage is communicated between the first refrigerant passage and the third refrigerant passage;
a four-way valve is arranged at the communication position of the third auxiliary passage and the first refrigerant passage, or a first switch valve is arranged on the first refrigerant passage and is positioned between the first auxiliary passage and the third auxiliary passage, and a second switch valve is arranged on the third auxiliary passage.
6. A multi-split system with hot water as claimed in claim 5, wherein a gas-liquid separator is provided on the third refrigerant passage, and the gas-liquid separator is located between the compressor and the third auxiliary passage;
and/or a third switching valve is arranged on the third refrigerant passage and is positioned between the third auxiliary passage and the indoor heat exchanger.
7. A control method of a multi-split air conditioning system with hot water is characterized by comprising the following steps:
when the condition that a refrigeration loop in the multi-split system with hot water is about to enter a high-pressure and overhigh state is obtained, a water flow driving piece in a water flow circulating system is started;
the water flow circulating system passes through the hot water heat exchanger, and the water flow driving piece can drive cold water in the water flow circulating system to continuously pass through the hot water heat exchanger to absorb heat;
the high-temperature and high-pressure refrigerant output by the compressor is subjected to shunting treatment, so that a part of refrigerant enters an indoor heat exchanger after being subjected to heat exchange through an outdoor heat exchanger, and the other part of refrigerant enters the indoor heat exchanger after being subjected to heat exchange with cold water in the water flow circulating system in the hot water heat exchanger.
8. The method for controlling the multi-split system with hot water as claimed in claim 7, wherein the step of acquiring that the refrigeration circuit in the multi-split system with hot water is about to enter the high-pressure and overhigh state specifically comprises the following steps:
acquiring a high-pressure temperature T1 in the refrigeration loop, an outdoor environment temperature T2 where an outdoor heat exchanger and a compressor are located, a discharge temperature T3 of the compressor, an operating frequency X1 of the compressor and an operating frequency X2 of the outdoor heat exchanger;
if T1 is more than or equal to T1Preparation of，T2≥T2Preparation of，T3≥T31Preparation of，X1≤X1Preparation ofAnd X2 is more than or equal to X2Preparation ofWherein T1Preparation ofAt a predetermined saturation temperature corresponding to the high pressure of the refrigeration circuit, T2Preparation ofFor a preset outdoor ambient temperature, T31Preparation ofFirst discharge temperature of compressor, X1Preparation ofX2 being the lowest operating frequency allowed by the compressorPreparation ofThe maximum allowable operating frequency of the outdoor heat exchanger;
the refrigeration circuit is about to enter a high pressure, too high state.
9. The method for controlling a multi-split system with hot water as claimed in claim 8, further comprising the following steps after the water flow driving member is started and the high-temperature and high-pressure refrigerant output from the compressor is split-flow processed:
s1, detecting a high-pressure temperature T1 in the refrigeration circuit, a discharge temperature T3 of the compressor and an air outlet temperature T4 of an outdoor unit of the refrigeration circuit;
if T1 < T1Preparation of，T3≤T32Preparation ofOr T4 ≧ T4Preparation ofWherein T32Preparation ofFor a preset second discharge temperature of the compressor, T32Preparation of＜T31Preparation of，T4Preparation ofThe air outlet temperature of the outdoor unit of the refrigeration loop is preset;
judging whether the time length for repeating the step S1 reaches a preset time length delta T;
if the time for repeating the steps reaches a preset time delta T, closing the water flow driving piece, and stopping shunting the high-temperature and high-pressure refrigerant output by the compressor;
and if the time length for repeating the steps does not reach the preset time length delta T, repeating the step S1.
10. A control method of a multi-on-line system with hot water, wherein the single-cold multi-on-line system comprises the multi-on-line system with hot water of any one of claims 1 to 6, the control method comprising the steps of:
and when the refrigerating circuit in the multi-split system with hot water is about to enter a high-pressure and overhigh state, starting the water flow driving piece and the second throttling element, and starting the liquid storage device.
CN202110995798.8A 2021-08-27 2021-08-27 Multi-split air conditioner system with hot water and control method thereof Pending CN113803814A (en)

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US20160116191A1 (en) * 2013-05-24 2016-04-28 Mitsubishi Electric Corporation Refrigeration cycle device
CN207515289U (en) * 2017-10-20 2018-06-19 珠海格力电器股份有限公司 Coolant circulating system
CN110940039A (en) * 2019-12-16 2020-03-31 宁波奥克斯电气股份有限公司 High-temperature liquid-collecting multi-split refrigerant recovery method and device and multi-split system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07151420A (en) * 1993-11-30 1995-06-16 Matsushita Electric Ind Co Ltd Air conditioner with water heater
JP2003176957A (en) * 2001-10-03 2003-06-27 Denso Corp Refrigerating cycle device
CN102679482A (en) * 2012-05-25 2012-09-19 宁波奥克斯空调有限公司 Heat recovery multiplex system based on variable-frequency air conditioner and control method thereof
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