CN111609479B - Air conditioner - Google Patents

Air conditioner Download PDF

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Publication number
CN111609479B
CN111609479B CN202010327931.8A CN202010327931A CN111609479B CN 111609479 B CN111609479 B CN 111609479B CN 202010327931 A CN202010327931 A CN 202010327931A CN 111609479 B CN111609479 B CN 111609479B
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China
Prior art keywords
heat exchanger
way valve
air conditioner
throttling element
outdoor heat
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CN202010327931.8A
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CN111609479A (en
Inventor
蒋贤国
王永琳
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Hisense Shandong Air Conditioning Co Ltd
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Hisense Shandong Air Conditioning Co Ltd
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Priority to CN202010327931.8A priority Critical patent/CN111609479B/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0059—Indoor units, e.g. fan coil units characterised by heat exchangers
    • F24F1/0063—Indoor units, e.g. fan coil units characterised by heat exchangers by the mounting or arrangement of the heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/14—Heat exchangers specially adapted for separate outdoor units
    • F24F1/16—Arrangement or mounting thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • 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
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • 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
    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Thermal Sciences (AREA)
  • Human Computer Interaction (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)

Abstract

The invention relates to the technical field of air conditioners, and discloses an air conditioner, which comprises a compressor, a four-way valve, an outdoor heat exchanger assembly, a first throttling element, a first three-way valve, a first indoor heat exchanger, a second three-way valve and a controller, wherein the controller is configured as follows: when the air conditioner is in a refrigerating state, the first end and the second end of the first throttling element, the first end and the second end of the first three-way valve and the first end and the second end of the second three-way valve are controlled to be opened, and the third end of the first three-way valve and the third end of the second three-way valve are controlled to be closed, so that the refrigerant flowing through the first throttling element flows into the first indoor heat exchanger and the second indoor heat exchanger respectively to be evaporated, and then is collected to the fourth end of the four-way valve and flows back to the compressor. The air conditioner can improve the heat exchange efficiency of the heat exchanger, thereby improving the refrigerating capacity and the heating capacity of the air conditioner and preventing the liquid impact phenomenon of the compressor.

Description

Air conditioner
Technical Field
The present invention relates to the field of air conditioning technology, and is especially one kind of air conditioner.
Background
With the improvement of living standard of people, the function of household appliances in daily life of people is more and more important. In particular, an air conditioner has long been an essential household appliance in modern life as a device capable of adjusting and controlling parameters such as temperature, humidity, and flow rate of ambient air in a building or structure.
At present, the existing air conditioner generally comprises a compressor, a heat exchanger, a four-way valve, a one-way valve capillary tube assembly and the like. Among them, the heat exchanger is a device for transferring part of heat of a hot fluid to a cold fluid, and can be used as an evaporator or a condenser in a practical use process. In the process of implementing the invention, the inventor finds that the prior art has at least the following technical problems: in the air conditioner, the pressure sensitivity of the heat exchanger as a condenser is inconsistent with the pressure sensitivity of the heat exchanger as an evaporator, and the refrigerant flows through the heat exchanger in the same way no matter the heat exchanger is used as the condenser or the evaporator, so that the heat exchange effect of the heat exchanger is poor, and the refrigerating capacity of the air conditioner is relatively poor.
Disclosure of Invention
The invention aims to provide an air conditioner which can improve the heat exchange efficiency of a heat exchanger so as to improve the refrigerating capacity of the air conditioner.
In order to solve the above technical problem, the present invention provides an air conditioner, comprising:
a compressor;
a first end of the four-way valve is connected with the output end of the compressor, and a second end of the four-way valve is connected with the input end of the compressor;
the first end of the outdoor heat exchanger assembly is connected with the third end of the four-way valve;
a first throttling element having a first end connected to a second end of the outdoor heat exchanger assembly;
a first three-way valve having a first end connected to a second end of the first throttling element;
a first end of the first indoor heat exchanger is connected with a second end of the first three-way valve, and a second end of the first indoor heat exchanger is connected with a fourth end of the four-way valve;
a second indoor heat exchanger having a first end connected to the second end of the first throttling element;
a first end of the second three-way valve is connected with a second end of the second indoor heat exchanger, a second end of the second three-way valve is connected with a fourth end of the four-way valve, and a third end of the second three-way valve is connected with a third end of the first three-way valve; and the number of the first and second groups,
a controller configured to:
when the air conditioner is in a refrigerating state, the first end and the second end of the first throttling element, the first end and the second end of the first three-way valve and the first end and the second end of the second three-way valve are controlled to be opened, and the third end of the first three-way valve and the third end of the second three-way valve are controlled to be closed, so that the refrigerant flowing through the first throttling element flows into the first indoor heat exchanger and the second indoor heat exchanger respectively to be evaporated, and then is collected to the fourth end of the four-way valve and flows back to the compressor.
In some embodiments of the present application, the controller is further configured to:
when the air conditioner is in a heating state, the first end and the second end of the first throttling element, the second end and the third end of the first three-way valve and the first end and the third end of the second three-way valve are controlled to be opened, and the first end of the first three-way valve and the second end of the second three-way valve are controlled to be closed, so that a refrigerant discharged from the compressor flows through the first indoor heat exchanger and the second indoor heat exchanger in sequence to be condensed, and then flows back to the compressor through the first throttling element, the outdoor heat exchanger assembly and the four-way valve in sequence.
In some embodiments of the present application, the air conditioner further comprises:
a second throttling element, a first end of the second throttling element being connected to a third end of the outdoor heat exchanger assembly, a second end of the second throttling element being connected to a first end of the first throttling element, a fourth end of the outdoor heat exchanger assembly being connected to a second end of the first throttling element;
the controller further configured to:
after controlling the first and second ends of the first throttling element, the second and third ends of the first three-way valve, and the first and third ends of the second three-way valve to be open, and controlling the first and second ends of the first and second three-way valves to be closed, the method further includes:
s11, detecting the suction superheat degree and the outdoor temperature of the air conditioner;
s12, when the suction superheat degree of the air conditioner is smaller than a preset first suction superheat degree threshold value and the outdoor temperature is smaller than a preset temperature threshold value, controlling the second throttling element to be opened so that the refrigerant flowing out of the second indoor heat exchanger is collected to the first end of the first throttling element after passing through the first throttling element and the outdoor heat exchanger assembly respectively, and then flows back to the compressor after passing through the outdoor heat exchanger assembly and the four-way valve in sequence;
s13, timing the operation time of the air conditioner again;
s14, judging whether the air suction superheat degree of the air conditioner is larger than a preset second air suction superheat degree threshold value or not after the operation time of the air conditioner reaches a preset time threshold value; wherein the second suction superheat threshold is greater than the first suction superheat threshold;
s15, when the air conditioner is judged to have the suction superheat degree smaller than or equal to the second suction superheat degree threshold value, controlling the second throttling element to be kept open, and returning to the step S13.
In some embodiments of the present application, the controller is further configured to:
after step S11, when the suction superheat of the air conditioner is greater than or equal to the first suction superheat threshold, controlling the second throttling element to close, and re-timing the operation time period of the air conditioner;
and returning to the step S11 when the operation time of the air conditioner reaches a preset time threshold.
In some embodiments of the present application, the controller is further configured to:
after step S14, when it is determined that the suction superheat of the air conditioner is greater than the second suction superheat threshold, the process returns to step S11.
In some embodiments of the present application, the outdoor heat exchanger assembly comprises:
a first end of the first outdoor heat exchanger is a first end of the outdoor heat exchanger assembly, a third end of the first outdoor heat exchanger is a third end of the outdoor heat exchanger assembly, and a fourth end of the first outdoor heat exchanger is a fourth end of the outdoor heat exchanger assembly; and the number of the first and second groups,
and a first end of the second outdoor heat exchanger is connected with a second end of the first outdoor heat exchanger, and a second end of the second outdoor heat exchanger is the second end of the outdoor heat exchanger assembly.
In some embodiments of the present application, the first outdoor heat exchanger is a double pipe heat exchanger.
In some embodiments of the present application, the first outdoor heat exchanger comprises:
a high temperature refrigerant pipe for flowing a high temperature refrigerant therethrough;
and the low-temperature refrigerant pipe is used for enabling a low-temperature refrigerant to flow through, and the flow direction of the low-temperature refrigerant in the low-temperature refrigerant pipe is opposite to the flow direction of the high-temperature refrigerant in the high-temperature refrigerant pipe.
In some embodiments of the present application, the high temperature refrigerant pipe is spiral.
In some embodiments of the present application, the low temperature refrigerant pipe includes:
the high-temperature refrigerant pipe is positioned in the low-temperature refrigerant pipe body;
a low-temperature refrigerant pipe inlet communicated with one end of the low-temperature refrigerant pipe body; and the number of the first and second groups,
and the low-temperature refrigerant pipe outlet is communicated with the other end of the low-temperature refrigerant pipe body and is positioned above the low-temperature refrigerant pipe inlet.
Compared with the prior art, the invention provides an air conditioner, when the air conditioner is in a refrigerating state, the first end and the second end of the first throttling element, the first end and the second end of the first three-way valve and the first end and the second end of the second three-way valve are controlled to be opened, and the third end of the first three-way valve and the third end of the second three-way valve are controlled to be closed, so that after a refrigerant discharged from the compressor sequentially flows through the four-way valve, the outdoor heat exchanger assembly and the first throttling element, one part of the refrigerant flows into the first indoor heat exchanger for evaporation, and the other part of the refrigerant flows into the second indoor heat exchanger for evaporation, the pressure loss in the first indoor heat exchanger and the second indoor heat exchanger is effectively reduced, and the heat exchange efficiency of the first indoor heat exchanger and the second indoor heat exchanger is improved, thereby improving the cooling capability of the air conditioner. In addition, in the embodiment of the present invention, when the air conditioner is in a heating state, the first end and the second end of the first throttling element, the second end and the third end of the first three-way valve, and the first end and the third end of the second three-way valve are controlled to be opened, and the first end of the first three-way valve and the second end of the second three-way valve are controlled to be closed, so that the refrigerant discharged from the compressor sequentially flows through the first indoor heat exchanger 6 and the second indoor heat exchanger to be condensed, a condensation process of the air conditioner is prolonged, and a maximization of heat exchange efficiency is achieved, thereby improving a heating capability of the air conditioner. In addition, in the embodiment of the invention, when the air conditioner is in a heating state, the air suction superheat degree of the air conditioner is smaller than a preset first air suction superheat degree threshold value, and the outdoor temperature is smaller than a preset temperature threshold value, the air suction superheat degree of the air conditioner is maintained between the first air suction superheat degree threshold value and the second air suction superheat degree threshold value by controlling the second throttling element, so that a liquid refrigerant is effectively prevented from entering the compressor, the refrigerant circulation quantity is increased, the heating effect is improved, and the heating capacity of the air conditioner is further improved.
Drawings
Fig. 1 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating a flow path of a refrigerant in an air conditioner during a cooling state according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating a flow path of a refrigerant in an air conditioner during a heating state according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an air conditioner according to another embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating a flow path of a refrigerant in an air conditioner during a heating state according to another embodiment of the present invention;
FIG. 6 is a schematic diagram illustrating another flow path of refrigerant in an air conditioner during a heating state according to another embodiment of the present invention;
fig. 7 is a schematic view illustrating a flow path of a refrigerant in an air conditioner in a cooling state according to another embodiment of the present invention;
fig. 8 is a schematic structural view of a first outdoor heat exchanger according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.
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 one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral 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 meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Fig. 1 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention.
In an embodiment of the present invention, the air conditioner includes:
a compressor 1;
a four-way valve 2, wherein a first end of the four-way valve 2 is connected with an output end of the compressor 1, and a second end of the four-way valve 2 is connected with an input end of the compressor 1;
the first end of the outdoor heat exchanger component 3 is connected with the third end of the four-way valve 2;
a first throttling element 4, a first end of the first throttling element 4 being connected with a second end of the outdoor heat exchanger assembly 3;
a first three-way valve 5, a first end of the first three-way valve 5 being connected with a second end of the first throttling element 4;
a first end of the first indoor heat exchanger 6 is connected with a second end of the first three-way valve 5, and a second end of the first indoor heat exchanger 6 is connected with a fourth end of the four-way valve 2;
a second indoor heat exchanger 7, a first end of the second indoor heat exchanger 7 being connected with a second end of the first throttling element 4;
a first end of the second three-way valve 8 is connected with a second end of the second indoor heat exchanger 7, a second end of the second three-way valve 8 is connected with a fourth end of the four-way valve 2, and a third end of the second three-way valve 8 is connected with a third end of the first three-way valve 5; and the number of the first and second groups,
a controller (not shown in the figures) configured to:
when the air conditioner is in a cooling state, the first end and the second end of the first throttling element 4, the first end and the second end of the first three-way valve 5 and the first end and the second end of the second three-way valve 8 are controlled to be opened, and the third end of the first three-way valve 5 and the third end of the second three-way valve 8 are controlled to be closed, so that the refrigerant flowing through the first throttling element 4 flows into the first indoor heat exchanger 6 and the second indoor heat exchanger 7 respectively to be evaporated, and then is collected to the fourth end of the four-way valve 2 and flows back to the compressor 1.
It is understood that the air conditioner of the embodiment of the present invention performs a refrigeration cycle of the air conditioner by using the compressor 1, the outdoor heat exchanger assembly 3, the first throttling element 4, the first three-way valve 5, the second three-way valve 8, the first indoor heat exchanger 6, and the second indoor heat exchanger 7. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the air that has been conditioned and heat-exchanged.
Specifically, as shown in fig. 2, when the controller receives a cooling command, the air conditioner performs cooling operation, that is, the air conditioner enters the cooling state, the controller controls the first and second ends of the first throttling element 4, the first and second ends of the first three-way valve 5, and the first and second ends of the second three-way valve 8 to be opened, and controls the third ends of the first three-way valve 5 and the second three-way valve 8 to be closed; at this time, the compressor 1 compresses the refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas; the discharged refrigerant gas flows into the outdoor heat exchanger assembly 3 through the first and third ends of the four-way valve 2, the outdoor heat exchanger assembly 3 at this time serves as a condenser, the compressed refrigerant is condensed into a liquid phase, and heat is released to the surrounding environment through the condensation process. The refrigerant flowing out of the outdoor heat exchanger unit 3 flows into the first throttling element 4, so that the high-temperature and high-pressure liquid-phase refrigerant flowing out of the outdoor heat exchanger unit 3 is expanded into a low-pressure liquid-phase refrigerant. A part of the refrigerant flowing out of the first throttling element 4 flows into the first indoor heat exchanger 6 through the first end and the second end of the first three-way valve 5 to be evaporated, the other part of the refrigerant flows into the second indoor heat exchanger 7 to be evaporated, the refrigerant flowing out of the first indoor heat exchanger 6 and the refrigerant flowing out of the second indoor heat exchanger 7 are collected to the fourth end of the four-way valve 2, and the refrigerant gas in a low-temperature and low-pressure state is returned to the compressor 1 through the second end of the four-way valve 2. During the refrigerating cycle, the first and second indoor heat exchangers 6 and 7 function as evaporators, which can achieve a refrigerating effect by heat-exchanging with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner can adjust the temperature of the indoor space throughout the cycle.
It should be noted that when the air conditioner is operated in a cooling mode, the evaporator is on a low-pressure side, which is sensitive to pressure loss. In this embodiment, when the air conditioner is in a cooling state, the first and second ends of the first throttling element 4, the first and second ends of the first three-way valve 5, and the first and second ends of the second three-way valve 8 are controlled to be opened, and the third end of the first three-way valve 5 and the third end of the second three-way valve 8 are controlled to be closed, so that after the refrigerant discharged from the compressor 1 sequentially passes through the four-way valve 2, the outdoor heat exchanger assembly 3, and the first throttling element 4, a part of the refrigerant flows into the first indoor heat exchanger 6 to be evaporated, and the other part of the refrigerant flows into the second indoor heat exchanger 7 to be evaporated, thereby effectively reducing pressure loss inside the first indoor heat exchanger 6 and the second indoor heat exchanger 7, and improving heat exchange efficiency of the first indoor heat exchanger 6 and the second indoor heat exchanger 7, thereby improving the cooling capability of the air conditioner.
In some embodiments of the present invention, as shown in fig. 1 and 3 in combination, the controller is further configured to:
when the air conditioner is in a heating state, the first end and the second end of the first throttling element 4, the second end and the third end of the first three-way valve 5 and the first end and the third end of the second three-way valve 8 are controlled to be opened, and the first end of the first three-way valve 5 and the second end of the second three-way valve 8 are controlled to be closed, so that a refrigerant discharged from the compressor 1 sequentially flows through the first indoor heat exchanger 6 and the second indoor heat exchanger 7 to be condensed, and then sequentially flows back to the compressor 1 through the first throttling element 4, the outdoor heat exchanger assembly 3 and the four-way valve 2.
It is understood that the air conditioner of the embodiment of the present invention also performs a heating cycle of the air conditioner by using the compressor 1, the outdoor heat exchanger assembly 3, the first throttling element 4, the first three-way valve 5, the second three-way valve 8, the first indoor heat exchanger 6, and the second indoor heat exchanger 7. The heating cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the air that has been conditioned and heat-exchanged.
Specifically, as shown in fig. 3, when the controller receives a heating instruction, the air conditioner is in a heating operation, that is, the air conditioner enters the heating state, the controller controls the first and second ends of the first throttling element 4, the second and third ends of the first three-way valve 5, and the first and third ends of the second three-way valve 8 to be opened, and controls the first end of the first three-way valve 5 and the second end of the second three-way valve 8 to be closed; at this time, the compressor 1 compresses the refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas; the discharged refrigerant gas flows into the first indoor heat exchanger 6 through the first end and the fourth end of the four-way valve 2 to be condensed, and the refrigerant flowing out of the first indoor heat exchanger 6 flows into the third end of the second three-way valve 8 through the second end and the third end of the first three-way valve 5 and flows out of the first end of the second three-way valve 8 to the second indoor heat exchanger 7 to be condensed; the first indoor heat exchanger 6 and the second indoor heat exchanger 7 at this time each function as a condenser, condensing the compressed refrigerant into a liquid phase, and releasing heat to the surroundings through a condensation process. The refrigerant flowing out of the second indoor heat exchanger 7 flows into the first throttling element 4, and the condensed high-temperature high-pressure liquid-phase refrigerant is expanded into a low-pressure liquid-phase refrigerant. The refrigerant flowing out of the first throttling element 4 flows into the outdoor heat exchanger assembly 3 to be evaporated, and then the refrigerant gas in a low-temperature and low-pressure state is returned to the compressor 1 through the third end and the second end of the four-way valve 2.
It should be noted that when the air conditioner is in heating operation, the condenser is on the high pressure side, which is insensitive to pressure loss. In this embodiment, when the air conditioner is in a heating state, the first end and the second end of the first throttling element 4, the second end and the third end of the first three-way valve 5, and the first end and the third end of the second three-way valve 8 are controlled to be opened, and the first end of the first three-way valve 5 and the second end of the second three-way valve 8 are controlled to be closed, so that the refrigerant discharged from the compressor 1 sequentially flows through the first indoor heat exchanger 6 and the second indoor heat exchanger 7 to be condensed, the condensing process of the air conditioner is prolonged, the maximization of the heat exchange efficiency is achieved, and therefore the heating capacity of the air conditioner is improved. Fig. 4 is a schematic structural diagram of an air conditioner according to another embodiment of the present invention.
The air conditioner in the embodiment of the present invention further includes:
a second throttling element 9, wherein a first end of the second throttling element 9 is connected with a third end of the outdoor heat exchanger assembly 3, a second end of the second throttling element 9 is connected with a first end of the first throttling element 4, and a fourth end of the outdoor heat exchanger assembly 3 is connected with a second end of the first throttling element 4;
the controller further configured to:
when the air conditioner is in a heating state, after controlling the first end and the second end of the first throttling element 4, the second end and the third end of the first three-way valve 5, and the first end and the third end of the second three-way valve 8 to be opened, and controlling the first end of the first three-way valve 5 and the second end of the second three-way valve 8 to be closed, the air conditioner further comprises:
s11, detecting the suction superheat degree and the outdoor temperature of the air conditioner;
s12, when the suction superheat of the air conditioner is less than a preset first suction superheat threshold, and the outdoor temperature is less than a preset temperature threshold, controlling the second throttling element 9 to open, so that the refrigerant flowing out of the second indoor heat exchanger 7 passes through the first throttling element 4 and the outdoor heat exchanger assembly 3, respectively, then is collected to the first end of the first throttling element 4, and then flows back to the compressor 1 after passing through the outdoor heat exchanger assembly 3 and the four-way valve 2 in sequence;
s13, timing the operation time of the air conditioner again;
s14, judging whether the air suction superheat degree of the air conditioner is larger than a preset second air suction superheat degree threshold value or not after the operation time of the air conditioner reaches a preset time threshold value; wherein the second suction superheat threshold is greater than the first suction superheat threshold;
s15, when the air conditioner is judged to have the suction superheat degree smaller than or equal to the second suction superheat degree threshold value, controlling the second throttling element to be kept open, and returning to the step S13.
Further, the controller of the present embodiment is further configured to:
after step S11 is executed, when the suction superheat of the air conditioner is greater than or equal to the first suction superheat threshold, controlling the second throttling element 9 to be closed, and timing the operation time length of the air conditioner again;
and when the running time of the air conditioner reaches a preset time threshold, returning to execute the step S11.
Further, the controller of the present embodiment is further configured to:
after step S14 is performed, when it is determined that the suction superheat of the air conditioner is greater than the second suction superheat threshold, the process returns to step S11.
Specifically, as shown in fig. 5, when the air conditioner is in a heating state, after the second throttling element 9 is opened, a part of the refrigerant flowing out of the second indoor heat exchanger 7 flows into the fourth end of the outdoor heat exchanger assembly 3 through a branch, flows out of the third end of the outdoor heat exchanger assembly 3, and then flows to the first end of the first throttling element 4 through the second throttling element 9; the other part of the refrigerant flows in from the second end of the first throttling element 4 and flows out from the first end of the first throttling element 4, that is, the two parts of the refrigerant are branched and collected to the first end of the first throttling element 4, then flow into the four-way valve 2 after passing through the outdoor heat exchanger assembly 3 again, and then flow back to the compressor 1. As shown in fig. 6, when the air conditioner is in a heating state, after the second throttling element 9 is turned off, the refrigerant flowing out of the second indoor heat exchanger 7 returns to the compressor 1 through the first throttling element 4, the outdoor heat exchanger assembly 3, and the four-way valve 2 in sequence.
In the embodiment of the present invention, the controller, through the above configuration, when the air conditioner is in a heating state, the suction superheat degree of the air conditioner is less than a preset first suction superheat degree threshold, and the outdoor temperature is less than a preset temperature threshold, can maintain the suction superheat degree of the air conditioner between the first suction superheat degree threshold and the second suction superheat degree threshold by controlling the second throttling element 9, thereby effectively preventing a liquid refrigerant from entering the compressor 1, and further preventing the compressor 1 from liquid slugging; in addition, the refrigerant circulation quantity is increased, and the heating effect is improved, so that the heating capacity of the air conditioner is improved under the low-temperature working condition.
It should be noted that the temperature threshold, the first suction superheat threshold, and the second suction superheat threshold may be set according to actual usage, and the present invention is not limited to this. Preferably, the temperature threshold in this embodiment is zero degrees centigrade; the first air suction superheat threshold value is zero centigrade degree; the second suction superheat threshold is five degrees celsius.
In addition, as shown in fig. 7, in the embodiment of the present invention, when the air conditioner is in the cooling state, the controller controls the first end and the second end of the first throttling element 4, the first end and the second end of the first three-way valve 5, and the first end and the second end of the second three-way valve 8 to be opened, controls the third end of the first three-way valve 5 and the third end of the second three-way valve 8 to be closed, and controls the second throttling element 9 to be closed, so that the refrigerant discharged from the compressor 1 flows through the four-way valve 2 and the outdoor heat exchanger assembly 3, and then flows into the first indoor heat exchanger 6 and the second indoor heat exchanger 7 for evaporation only through the branch where the first throttling element 4 is located.
In addition, the types of the first throttling element 4 and the second throttling element 9 of the present embodiment may be set according to actual use conditions, and the present invention is not limited thereto. In order to simplify the structure and reduce the cost, preferably, the first throttling element 4 of the present embodiment is an electronic expansion valve; the second throttling element 9 is an electronic expansion valve.
In some embodiments of the present invention, in order to further improve the heat exchange effect of the air conditioner, the outdoor heat exchanger assembly 3 in this embodiment includes:
a first end of the first outdoor heat exchanger 31 is a first end of the outdoor heat exchanger assembly 3, a third end of the first outdoor heat exchanger 31 is a third end of the outdoor heat exchanger assembly 3, and a fourth end of the first outdoor heat exchanger 31 is a fourth end of the outdoor heat exchanger assembly 3; and the number of the first and second groups,
a first end of the second outdoor heat exchanger 32 is connected to a second end of the first outdoor heat exchanger 31, and a second end of the second outdoor heat exchanger 32 is a second end of the outdoor heat exchanger assembly 3.
Specifically, the first end of the outdoor heat exchanger assembly 3 is connected to the third end of the four-way valve 2, and the first end of the first throttling element 4 is connected to the second end of the outdoor heat exchanger assembly 3, which is specifically represented as:
a first end of the first outdoor heat exchanger 31 is connected to a third end of the four-way valve 2, a second end of the first outdoor heat exchanger 31 is connected to a first end of the second outdoor heat exchanger 32, and a second end of the second outdoor heat exchanger is connected to a first end of the first throttling element 4.
The first end of the second throttling element 9 is connected with the third end of the outdoor heat exchanger assembly 3, and the fourth end of the outdoor heat exchanger assembly 3 is connected with the second end of the first throttling element 4, which is specifically represented as follows:
a third end of the first outdoor heat exchanger 31 is connected to a first end of the second throttling element 9, and a fourth end of the first outdoor heat exchanger 31 is connected to a second end of the first throttling element 4.
It can be understood that when the air conditioner is in a cooling state, the refrigerant discharged from the compressor 1 passes through the four-way valve 2, then sequentially passes through the first outdoor heat exchanger 31 and the second outdoor heat exchanger 32, then flows into the first throttling element 4, and the refrigerant flowing out of the second throttling element 4 is divided into the first indoor heat exchanger 6 and the second indoor heat exchanger 7, then is collected to the fourth end of the four-way valve, and finally flows back into the compressor 1. When the air conditioner is in a heating state, a part of the refrigerant flowing out of the second indoor heat exchanger 7 flows into the fourth end of the first outdoor heat exchanger 31 through a branch, flows out of the third end of the first outdoor heat exchanger 31, and then flows to the first end of the first throttling element through the second throttling element 9; another part of the refrigerant flows into the second end of the first throttling element 4 and flows out from the first end of the first throttling element 4, that is, the two parts of the refrigerant are branched and collected to the first end of the first throttling element 4, then sequentially pass through the second outdoor heat exchanger 31 and the first outdoor heat exchanger 31 and then flow into the four-way valve 2, and further flow back to the compressor 1.
In the embodiment of the present invention, the type of the first outdoor heat exchanger 31 may be set according to actual use conditions. In order to simplify the structure, reduce the cost, and ensure the heat exchange effect, preferably, the first outdoor heat exchanger 31 in this embodiment is a double pipe heat exchanger.
As shown in fig. 8, in some embodiments of the present invention, in order to further improve the heat exchange efficiency of the first outdoor heat exchanger 31, the first outdoor heat exchanger 31 of the present embodiment includes:
a high-temperature refrigerant pipe 311 for flowing a high-temperature refrigerant therethrough;
and a low-temperature refrigerant pipe 312 through which a low-temperature refrigerant flows, wherein a flow direction of the low-temperature refrigerant in the low-temperature refrigerant pipe 312 is opposite to a flow direction of the high-temperature refrigerant in the high-temperature refrigerant pipe 311.
In the embodiment of the present invention, the flow direction of the low-temperature refrigerant in the low-temperature refrigerant pipe 312 is opposite to the flow direction of the high-temperature refrigerant in the high-temperature refrigerant pipe 311, so that the low-temperature refrigerant and the high-temperature refrigerant can fully exchange heat, and the heat exchange efficiency of the first outdoor heat exchanger 31 is improved.
In the embodiment of the present invention, the shape of the high-temperature refrigerant pipe 311 may be set according to actual use conditions, and it is only necessary to ensure that the high-temperature refrigerant can pass through. In order to further improve the heat exchange efficiency of the first outdoor heat exchanger 31, in this embodiment, the high-temperature refrigerant pipe 311 is preferably shaped like a spiral.
As shown in fig. 8, in order to further improve the heat exchange efficiency of the first outdoor heat exchanger 31, the low-temperature refrigerant pipe 312 in this embodiment preferably includes:
the high-temperature refrigerant pipe 311 is positioned in the low-temperature refrigerant pipe body 3121;
a low-temperature refrigerant pipe inlet 3122, the low-temperature refrigerant pipe inlet 3122 being communicated with one end of the low-temperature refrigerant pipe body 3121; and the number of the first and second groups,
and a low-temperature refrigerant pipe outlet 3123, the low-temperature refrigerant pipe outlet 3123 is communicated with the other end of the low-temperature refrigerant pipe body 3121, and the low-temperature refrigerant pipe outlet 3123 is located above the low-temperature refrigerant pipe inlet 3122.
In the embodiment of the present invention, the low-temperature refrigerant pipe outlet 3123 is disposed above the low-temperature refrigerant pipe inlet 3122, so that the position of the low-temperature refrigerant pipe outlet 3123 is higher than the position of the low-temperature refrigerant pipe inlet, thereby further enabling the low-temperature refrigerant and the high-temperature refrigerant in the first outdoor heat exchanger 31 to perform sufficient heat exchange, further improving the heat exchange efficiency of the first outdoor heat exchanger 31, and thus ensuring the cooling capacity and the heating capacity of the air conditioner.
In summary, the present invention provides an air conditioner, comprising: a compressor 1; a four-way valve 2, wherein a first end of the four-way valve 2 is connected with an output end of the compressor 1, and a second end of the four-way valve 2 is connected with an input end of the compressor 1; the first end of the outdoor heat exchanger component 3 is connected with the third end of the four-way valve 2; a first throttling element 4, a first end of the first throttling element 4 being connected with a second end of the outdoor heat exchanger assembly 3; a first three-way valve 5, a first end of the first three-way valve 5 being connected with a second end of the first throttling element 4; a first end of the first indoor heat exchanger 6 is connected with a second end of the first three-way valve 5, and a second end of the first indoor heat exchanger 6 is connected with a fourth end of the four-way valve 2; a second indoor heat exchanger 7, a first end of the second indoor heat exchanger 7 being connected with a second end of the first throttling element 4; a first end of the second three-way valve 8 is connected with a second end of the second indoor heat exchanger 7, a second end of the second three-way valve 8 is connected with a fourth end of the four-way valve 2, and a third end of the second three-way valve 8 is connected with a third end of the first three-way valve 5; and a controller configured to: when the air conditioner is in a cooling state, the first end and the second end of the first throttling element 4, the first end and the second end of the first three-way valve 5 and the first end and the second end of the second three-way valve 8 are controlled to be opened, and the third end of the first three-way valve 5 and the third end of the second three-way valve 8 are controlled to be closed, so that the refrigerant flowing through the first throttling element 4 flows into the first indoor heat exchanger 6 and the second indoor heat exchanger 7 respectively to be evaporated, and then is collected to the fourth end of the four-way valve 2 and flows back to the compressor 1. When the air conditioner is in a cooling state, the first end and the second end of the first throttling element 4, the first end and the second end of the first three-way valve 5 and the first end and the second end of the second three-way valve 8 are controlled to be opened, and the third end of the first three-way valve 5 and the third end of the second three-way valve 8 are controlled to be closed, so that after the refrigerant discharged from the compressor 1 sequentially passes through the four-way valve 2, the outdoor heat exchanger assembly 3 and the first throttling element 4, a part of the refrigerant flows into the first indoor heat exchanger 6 to be evaporated, and the other part of the refrigerant flows into the second indoor heat exchanger 7 to be evaporated, the pressure loss in the first indoor heat exchanger 6 and the second indoor heat exchanger 7 is effectively reduced, and the heat exchange efficiency of the first indoor heat exchanger 6 and the second indoor heat exchanger 7 is improved, thereby improving the cooling capability of the air conditioner. In addition, when the air conditioner is in a heating state, the first end and the second end of the first throttling element 4, the second end and the third end of the first three-way valve 5 and the first end and the third end of the second three-way valve 8 are controlled to be opened, and the first end of the first three-way valve 5 and the second end of the second three-way valve 8 are controlled to be closed, so that the refrigerant discharged from the compressor 1 sequentially flows through the first indoor heat exchanger 6 and the second indoor heat exchanger 7 to be condensed, the condensing process of the air conditioner is prolonged, the maximization of the heat exchange efficiency is achieved, and the heating capacity of the air conditioner is improved.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.

Claims (8)

1. An air conditioner, comprising:
a compressor;
a first end of the four-way valve is connected with the output end of the compressor, and a second end of the four-way valve is connected with the input end of the compressor;
the first end of the outdoor heat exchanger assembly is connected with the third end of the four-way valve;
a first throttling element having a first end connected to a second end of the outdoor heat exchanger assembly;
a first three-way valve having a first end connected to a second end of the first throttling element;
a first end of the first indoor heat exchanger is connected with a second end of the first three-way valve, and a second end of the first indoor heat exchanger is connected with a fourth end of the four-way valve;
a second indoor heat exchanger having a first end connected to the second end of the first throttling element;
a first end of the second three-way valve is connected with a second end of the second indoor heat exchanger, a second end of the second three-way valve is connected with a fourth end of the four-way valve, and a third end of the second three-way valve is connected with a third end of the first three-way valve; and the number of the first and second groups,
a controller configured to:
when the air conditioner is in a refrigerating state, controlling the first end and the second end of the first throttling element, the first end and the second end of the first three-way valve and the first end and the second end of the second three-way valve to be opened, and controlling the third end of the first three-way valve and the third end of the second three-way valve to be closed, so that the refrigerant flowing through the first throttling element respectively flows into the first indoor heat exchanger and the second indoor heat exchanger to be evaporated, and then is collected to the fourth end of the four-way valve and flows back to the compressor;
when the air conditioner is in a heating state, controlling the first end and the second end of the first throttling element, the second end and the third end of the first three-way valve and the first end and the third end of the second three-way valve to be opened, and controlling the first end of the first three-way valve and the second end of the second three-way valve to be closed, so that a refrigerant discharged from the compressor flows through the first indoor heat exchanger and the second indoor heat exchanger in sequence for condensation, and then flows back to the compressor through the first throttling element, the outdoor heat exchanger assembly and the four-way valve in sequence;
the air conditioner further includes:
a second throttling element, a first end of the second throttling element being connected to a third end of the outdoor heat exchanger assembly, a second end of the second throttling element being connected to a first end of the first throttling element, a fourth end of the outdoor heat exchanger assembly being connected to a second end of the first throttling element;
the controller further configured to:
after controlling the first and second ends of the first throttling element, the second and third ends of the first three-way valve, and the first and third ends of the second three-way valve to be open, and controlling the first and second ends of the first and second three-way valves to be closed, the method further includes:
s11, detecting the suction superheat degree and the outdoor temperature of the air conditioner;
s12, when the suction superheat degree of the air conditioner is smaller than a preset first suction superheat degree threshold value and the outdoor temperature is smaller than a preset temperature threshold value, controlling the second throttling element to be opened so that the refrigerant flowing out of the second indoor heat exchanger is collected to the first end of the first throttling element after passing through the first throttling element and the outdoor heat exchanger assembly respectively, and then flows back to the compressor after passing through the outdoor heat exchanger assembly and the four-way valve in sequence;
s13, timing the operation time of the air conditioner again;
s14, judging whether the air suction superheat degree of the air conditioner is larger than a preset second air suction superheat degree threshold value or not after the operation time of the air conditioner reaches a preset time threshold value; wherein the second suction superheat threshold is greater than the first suction superheat threshold;
s15, when the air conditioner is judged to have the suction superheat degree smaller than or equal to the second suction superheat degree threshold value, controlling the second throttling element to be kept open, and returning to the step S13.
2. The air conditioner of claim 1, wherein the controller is further configured to:
after step S11, when the suction superheat of the air conditioner is greater than or equal to the first suction superheat threshold, controlling the second throttling element to close, and re-timing the operation time period of the air conditioner;
and returning to the step S11 when the operation time of the air conditioner reaches a preset time threshold.
3. The air conditioner of claim 2, wherein the controller is further configured to:
after step S14, when it is determined that the suction superheat of the air conditioner is greater than the second suction superheat threshold, the process returns to step S11.
4. An air conditioner according to any one of claims 1 to 3, wherein said outdoor heat exchanger assembly comprises:
a first end of the first outdoor heat exchanger is a first end of the outdoor heat exchanger assembly, a third end of the first outdoor heat exchanger is a third end of the outdoor heat exchanger assembly, and a fourth end of the first outdoor heat exchanger is a fourth end of the outdoor heat exchanger assembly; and the number of the first and second groups,
and a first end of the second outdoor heat exchanger is connected with a second end of the first outdoor heat exchanger, and a second end of the second outdoor heat exchanger is the second end of the outdoor heat exchanger assembly.
5. The air conditioner according to claim 4, wherein said first outdoor heat exchanger is a double pipe heat exchanger.
6. The air conditioner according to claim 5, wherein the first outdoor heat exchanger includes:
a high temperature refrigerant pipe for flowing a high temperature refrigerant therethrough;
and the low-temperature refrigerant pipe is used for enabling a low-temperature refrigerant to flow through, and the flow direction of the low-temperature refrigerant in the low-temperature refrigerant pipe is opposite to the flow direction of the high-temperature refrigerant in the high-temperature refrigerant pipe.
7. The air conditioner as claimed in claim 6, wherein the high temperature refrigerant pipe is formed in a spiral shape.
8. The air conditioner as claimed in claim 7, wherein the low temperature refrigerant pipe comprises:
the high-temperature refrigerant pipe is positioned in the low-temperature refrigerant pipe body;
a low-temperature refrigerant pipe inlet communicated with one end of the low-temperature refrigerant pipe body; and the number of the first and second groups,
and the low-temperature refrigerant pipe outlet is communicated with the other end of the low-temperature refrigerant pipe body and is positioned above the low-temperature refrigerant pipe inlet.
CN202010327931.8A 2020-04-23 2020-04-23 Air conditioner Active CN111609479B (en)

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