CN110726173A - Defrosting system and control method for outdoor unit without stopping and air conditioner - Google Patents

Defrosting system and control method for outdoor unit without stopping and air conditioner Download PDF

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Publication number
CN110726173A
CN110726173A CN201911124877.0A CN201911124877A CN110726173A CN 110726173 A CN110726173 A CN 110726173A CN 201911124877 A CN201911124877 A CN 201911124877A CN 110726173 A CN110726173 A CN 110726173A
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CN
China
Prior art keywords
valve
stop valve
heat exchanger
way reversing
stop
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Pending
Application number
CN201911124877.0A
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Chinese (zh)
Inventor
王猛
任小辉
邹富强
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Ningbo Aux Electric Co Ltd
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Ningbo Aux Electric Co Ltd
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Priority to CN201911124877.0A priority Critical patent/CN110726173A/en
Publication of CN110726173A publication Critical patent/CN110726173A/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
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
    • 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
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/41—Defrosting; Preventing freezing
    • F24F11/42—Defrosting; Preventing freezing of outdoor units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • 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
    • F24F11/62—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
    • F24F11/65—Electronic processing for selecting an operating mode
    • 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
    • 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
    • F24F11/00—Control or safety arrangements
    • F24F11/88—Electrical aspects, e.g. circuits
    • 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

Abstract

The invention provides an external unit non-stop defrosting system, which relates to the technical field of air conditioners and comprises a first external unit heat exchanger, a second external unit heat exchanger, a first four-way reversing valve, a first throttling assembly, a second throttling assembly and a seventh stop valve; the first external machine heat exchanger, the first throttling assembly, the second external machine heat exchanger, the seventh stop valve and the second throttling assembly are sequentially connected in series; the S1 end of the first four-way reversing valve is connected with the compression system, the C1 end of the first four-way reversing valve is connected with the first outer machine heat exchanger, the E1 end of the first four-way reversing valve is connected between the second outer machine heat exchanger and the seventh stop valve, and the D1 end of the first four-way reversing valve is connected between the seventh stop valve and the second throttling assembly. According to the defrosting system without stopping the external machine, the control method and the air conditioner, the two external machine heat exchangers arranged in series can alternately defrost, when one external machine heat exchanger needs defrosting, the other external machine heat exchanger can exchange heat, and heating is guaranteed to be not stopped.

Description

Defrosting system and control method for outdoor unit without stopping and air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to a defrosting system without stopping an external unit, a control method and an air conditioner.
Background
In areas where there is no central heating in winter, air conditioners (especially multi-split air conditioners) have become the primary heating means. However, when the air conditioner operates in a heating mode, the surface of the heat exchanger of the outdoor unit is easily frosted due to low external environment temperature, and the heat exchange effect is seriously affected.
The defrosting method of the air conditioner at present comprises two methods, namely thermal defrosting and non-thermal defrosting. The non-thermal defrosting mainly comprises defrosting by external force, including ultrasonic defrosting, and the defrosting starting effect of the non-thermal defrosting is obvious, but the continuous defrosting effect is poor. The thermal defrosting mainly comprises reverse circulation defrosting and hot gas bypass defrosting, the two defrosting effects are obvious and are also the most common defrosting methods at present, but the defrosting needs to be stopped, so that the indoor heat supply is insufficient, and the energy consumption of a compressor is increased during defrosting.
Disclosure of Invention
The invention solves the problems that the defrosting effect is not high in the existing non-thermal defrosting mode, the thermal defrosting needs to be stopped, the indoor heat supply is insufficient, and the energy consumption of a compressor is increased during defrosting.
In order to solve the problems, the invention provides a defrosting system without stopping an external machine, which comprises a first external machine heat exchanger, a second external machine heat exchanger, a first four-way reversing valve, a first throttling assembly, a second throttling assembly and a seventh stop valve;
the first external machine heat exchanger, the first throttling assembly, the second external machine heat exchanger, a seventh stop valve and the second throttling assembly are sequentially connected in series;
the S1 end of the first four-way reversing valve is connected with a compression system, the C1 end of the first four-way reversing valve is connected with the first outer machine heat exchanger, the E1 end of the first four-way reversing valve is connected between the second outer machine heat exchanger and the seventh stop valve, and the D1 end of the first four-way reversing valve is connected between the seventh stop valve and the second throttling assembly.
According to the invention, the two outer machine heat exchangers connected in series are arranged, so that the two outer machine heat exchangers arranged in series can alternately defrost, when one outer machine heat exchanger needs defrosting, the other outer machine heat exchanger can exchange heat, and the heating is ensured not to stop, and the indoor continuous heat supply is ensured; and two outer machine heat exchangers can carry out the heat transfer simultaneously, improve heat exchange efficiency.
Optionally, the indoor unit further comprises an indoor unit heat exchanger, and an air pipe and a liquid pipe of the indoor unit heat exchanger are respectively connected with the compression system and the second throttling assembly, so that control over an indoor environment is ensured.
Optionally, the compression system includes a compressor and a second four-way reversing valve, the C2 end of the second four-way reversing valve is connected to the S1 end of the first four-way reversing valve, the D2 end of the second four-way reversing valve is connected to the air pipe of the compressor, the E2 end of the second four-way reversing valve is connected to the indoor unit heat exchanger, the S2 end of the second four-way reversing valve is connected to the liquid pipe of the compressor, a high-temperature and high-pressure refrigerant can be provided, and the system can realize cooling and heating functions by reversing the second four-way reversing valve.
Optionally, the device further comprises a first stop valve, a third stop valve and a sixth stop valve;
the first stop valve is arranged between the end C2 of the second four-way reversing valve and the end S1 of the first four-way reversing valve, the third stop valve is arranged between the end C1 of the first outer machine heat exchanger, one end of the sixth stop valve is connected between the second outer machine heat exchanger and the seventh stop valve, the other end of the sixth stop valve is connected with the end E1 of the first four-way reversing valve, the trend of refrigerants in the system is realized through the control of valves and pipelines, the multi-mode operation of refrigeration, heating and defrosting modes is realized, the control of the plurality of stop valves can be used for realizing the defrosting of the first outer machine heat exchanger and the second outer machine heat exchanger respectively, and the defrosting process is not stopped.
Optionally, the first throttling assembly comprises a first throttling element and a fifth stop valve which are connected in series, and a fourth stop valve which is connected with two ends of the first throttling element and the fifth stop valve which are connected in series in parallel;
the second throttling assembly comprises a second throttling piece and a ninth stop valve which are connected in series, and an eighth stop valve which is connected with the second throttling piece and the ninth stop valve in parallel. According to actual needs, throttling can be carried out when throttling is needed, and when throttling is not needed, the throttling assembly can also be used as a communicating pipe to enable a refrigerant to flow through without throttling.
Optionally, the first throttling element and the second throttling element are electronic expansion valves, capillary tubes or thermal expansion valves, so that the throttling function is realized, and the throttling function is simple and easy to realize.
The invention also provides a defrosting control method without stopping the outdoor unit, which comprises the following steps:
when a defrosting signal of the first outer machine heat exchanger is received, the first four-way reversing valve is controlled to be communicated with the end D1 and the end C1, the second four-way reversing valve is controlled to be communicated with the end D2 and the end E2, the first stop valve, the third stop valve, the fifth stop valve, the sixth stop valve and the eighth stop valve are controlled to be communicated, and the fourth stop valve, the seventh stop valve and the ninth stop valve are closed;
when a defrosting signal of a second outdoor unit heat exchanger is received, the first four-way reversing valve is controlled to be communicated with the end D1 and the end E1, the second four-way reversing valve is controlled to be communicated with the end D2 and the end E2, the first stop valve, the third stop valve, the fifth stop valve, the sixth stop valve and the eighth stop valve are controlled to be communicated, and the fourth stop valve, the seventh stop valve and the ninth stop valve are closed.
The defrosting control method is simple in control process, can selectively defrost the external heat exchanger through the control of the valve, and is simple and easy to implement.
The present invention also provides a computer-readable storage medium storing a computer program which, when read and executed by a processor, implements the above-described defrost control method.
The invention also provides an air conditioner, which comprises the defrosting system without stopping the outdoor unit, and further comprises a computer readable storage medium and a processor, wherein the computer readable storage medium stores a computer program, and when the computer program is read and run by the processor, the defrosting control method is realized. .
The beneficial effects of the computer readable storage medium and the air conditioner over the prior art are the same as the beneficial effects of the outdoor unit non-stop defrosting system over the prior art, and are not described herein again.
Optionally, the air conditioner further includes a second stop valve, one end of the second stop valve is connected between the second four-way reversing valve and the first stop valve, and the other end of the second stop valve is connected to the first external unit heat exchanger.
When the air conditioner operates in a heating mode or a refrigerating mode, the circulation of the refrigerant can be realized without passing through the first four-way reversing valve, the path of the refrigerant is shorter, and the system is simpler to operate.
Drawings
FIG. 1 is a schematic view of a defrost system according to an embodiment of the present invention;
fig. 2 is a schematic view illustrating a refrigerant flow direction when the defrosting system defrosts the first external unit heat exchanger according to the embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a refrigerant flow direction when the defrosting system defrosts the second outdoor unit heat exchanger according to the embodiment of the present invention;
FIG. 4 is a schematic view of a second shut-off valve according to an embodiment of the present invention;
fig. 5 is a schematic flow diagram illustrating a refrigerant flow direction in a heating mode of the air conditioner according to the embodiment of the present invention;
fig. 6 is a schematic flow diagram illustrating a cooling mode refrigerant of an air conditioner according to an embodiment of the present invention.
Description of reference numerals:
1-a first external machine heat exchanger, 2-a second external machine heat exchanger, 3-a first four-way reversing valve, 4-a second four-way reversing valve, 5-a compressor, 6-an internal machine heat exchanger, 7-a first throttling element, 8-a second throttling element, 9-a first stop valve, 10-a second stop valve, 11-a third stop valve, 12-a fourth stop valve, 13-a fifth stop valve, 14-a sixth stop valve, 15-a seventh stop valve, 16-an eighth stop valve and 17-a ninth stop valve.
Detailed Description
When an external machine heat exchanger of an existing air conditioner is frosted or is easy to frost, thermal defrosting is usually adopted, and a reverse circulation defrosting method is the most common method. The reverse cycle defrosting method refers to: when the air conditioner is operated in a heating mode and needs defrosting to the external machine heat exchanger, the four-way reversing valve reverses, so that high-temperature and high-pressure refrigerant compressed by the compressor firstly flows into the external machine heat exchanger for defrosting and then enters the throttling device, the internal machine heat exchanger and other parts. The main problem brought by the process is that the heat exchanger of the inner machine does not provide heat any more, so that the indoor heat supply is insufficient, the temperature comfort degree of a user cannot be met, and the process is particularly obvious for multi-split air conditioner.
The invention provides a defrosting system without stopping an outdoor unit, a control method and an air conditioner aiming at the defrosting problem of the outdoor unit, so that the defrosting process of the air conditioner is not stopped, and the indoor continuous heat supply is ensured.
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 description of the present invention, it should be noted that terms such as "first", "second", and the like in the embodiments 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.
The embodiment provides a defrosting system without stopping an external unit, which at least comprises a first external unit heat exchanger and a second external unit heat exchanger which are connected in series relative to an existing air conditioner (especially a multi-split air conditioner). The first external machine heat exchanger and the second external machine heat exchanger can be the same in type or different in type. When the air conditioner operates in a refrigerating and heating mode, the first outer machine heat exchanger 1 and the second outer machine heat exchanger exchange heat, one of the two outer machine heat exchangers can exchange heat, and the two outer machine heat exchangers can also exchange heat simultaneously, so that the heat exchange efficiency of the outer machine heat exchangers is improved.
When any one of the first outer machine heat exchanger and the second outer machine heat exchanger frosts, the frosted outer machine heat exchanger defrosts, and the non-frosted outer machine heat exchanger exchanges heat. Preferably, any one or more combination of a plurality of defrosting modes such as thermal defrosting and non-thermal defrosting can be adopted for the frosted outer machine heat exchanger.
The two outer machine heat exchangers connected in series are arranged, so that the two outer machine heat exchangers arranged in series can work alternately, when one outer machine heat exchanger needs defrosting, the other outer machine heat exchanger can exchange heat, and the heating is guaranteed not to stop, and the indoor continuous heat supply is guaranteed; and two outer machine heat exchangers can carry out the heat transfer simultaneously, improve heat exchange efficiency.
And the heat exchanger of the outdoor unit for defrosting is equivalent to a subcooler, the cold energy of a frost layer can be utilized, the supercooling degree of a refrigerant is improved, the system efficiency is improved, the reduction of the heating quantity during defrosting is compensated, and the continuous heating effect is realized.
On the basis of the above embodiment, in order to enable the cooling and heating functions to operate normally, the defrosting system without stopping the outdoor unit in this embodiment further includes a throttling device. When the heating mode is operated, the throttling device throttles the refrigerant discharged by the internal heat exchanger; when the refrigerating mode is operated, the throttling device throttles the refrigerant entering the heat exchanger of the internal machine.
When any one of the first outer machine heat exchanger and the second outer machine heat exchanger frosts, the throttling device throttles the refrigerant discharged by the outer machine heat exchanger for defrosting, and the throttled refrigerant is suitable for entering the outer machine heat exchanger which does not frost.
Specifically, a single throttling device can be controlled in multiple ways such as a four-way valve, so as to achieve the above throttling effect on the refrigerant, and this embodiment provides a simpler implementation, specifically, as shown in fig. 1, including:
the throttling device comprises a first throttling component and a second throttling component, the first throttling component is connected between the first outer machine heat exchanger 1 and the second outer machine heat exchanger 2 in series, and the second throttling component is connected between the second outer machine heat exchanger 2 and the inner machine heat exchanger in series.
When the air conditioner normally operates in the heating mode, the refrigerant discharged by the compressor enters the inner machine heat exchanger for heat exchange, then is throttled by the second throttling component, enters the first outer machine heat exchanger 1 and the second outer machine heat exchanger 2 which are connected in series for heat exchange, at the moment, the first throttling component does not throttle, and the refrigerant returns to the compressor.
When the air conditioner normally operates in a refrigeration mode, a refrigerant discharged by the compressor firstly enters the first outer machine heat exchanger 1 and the second outer machine heat exchanger 2 which are connected in series for heat exchange, the first throttling assembly does not throttle at the moment, then the refrigerant enters the second throttling assembly for throttling, then enters the inner machine heat exchanger for heat exchange, and returns to the compressor.
When the air conditioner defrosts the first outer machine heat exchanger 1, refrigerant discharged by the compressor enters the inner machine heat exchanger for heat exchange, then enters the first outer machine heat exchanger 1 for defrosting, then is throttled by the first throttling assembly, then flows into the second outer machine heat exchanger 2 for heat exchange, and then returns to the compressor.
When the air conditioner defrosts the second external machine heat exchanger 2, the refrigerant discharged by the compressor enters the internal machine heat exchanger for heat exchange, then enters the second external machine heat exchanger 2 for defrosting, then is throttled by the first throttling component, then flows into the first external machine heat exchanger 1 for heat exchange, and then returns to the compressor.
Specifically, as shown in fig. 1 to 6, the defrosting system includes a first outer machine heat exchanger 1, a first throttling assembly, a second outer machine heat exchanger 2, a seventh stop valve 15, and a second throttling assembly, which are connected in series, an S1 end of a first four-way reversing valve 3 is connected to the compression system, a C1 end of the first four-way reversing valve 3 is connected to the first outer machine heat exchanger 1, an E1 end of the first four-way reversing valve 3 is connected between the second outer machine heat exchanger 2 and the seventh stop valve 15, and a D1 end of the first four-way reversing valve 3 is connected between the seventh stop valve 15 and the second throttling assembly.
The compression system is used for providing high-temperature and high-pressure refrigerants and comprises a compressor 5 and a second four-way reversing valve 4, wherein the C2 end of the second four-way reversing valve 4 is connected with the S1 end of the first four-way reversing valve 3, the D2 end of the second four-way reversing valve 4 is connected with an air pipe of the compressor 5, the E2 end of the second four-way reversing valve 4 is connected with an inner machine heat exchanger 6, and the S2 end of the second four-way reversing valve 4 is connected with a liquid pipe of the compressor 5. Specifically, in the air conditioner which only needs heating but does not need cooling, the second four-way reversing valve 4 is not needed, and the switching between the cooling mode and the heating mode of the compressor is realized by reversing the second four-way reversing valve 4.
Specifically, through the design of the valve and the pipeline, the selection of throttling the refrigerant by adopting the first throttling assembly and the second throttling assembly can be realized in various ways. The embodiment provides a simple implementation manner, and as shown in fig. 1 to 6, the first throttling assembly includes a first throttling element 7 and a fifth stop valve 13 connected in series, and a fourth stop valve 12 connected in parallel with two ends of the first throttling element 7 and the fifth stop valve 13 connected in series. When the first throttling member 7 is required to perform throttling, the fifth stop valve 13 is communicated and the fourth stop valve 12 is disconnected; when the first throttle 7 is not required for throttling, the fourth cut valve 12 is communicated and the fifth cut valve 13 is disconnected.
As shown in fig. 2, the second throttle assembly includes a second throttle member 8 and a ninth shut-off valve 17 connected in series, and an eighth shut-off valve 16 connected in parallel with both ends of the second throttle member 8 and the ninth shut-off valve 17 connected in series. When the second throttling element 8 is required to perform throttling, the ninth stop valve 17 is communicated and the eighth stop valve 16 is disconnected; when the second throttle 8 is not required for throttling, the eighth cut valve 16 is communicated and the ninth cut valve 17 is disconnected.
On the basis of the above embodiments, the present embodiment provides a specific embodiment for connecting the first external machine heat exchanger 1, the first throttling assembly, the second external machine heat exchanger 2 and the second throttling assembly, and with reference to fig. 3, provides an external machine non-stop defrosting system, which includes a first external machine heat exchanger 1, a second external machine heat exchanger 2, an internal machine heat exchanger 6 and a second four-way reversing valve 4 connected in series, where the second four-way reversing valve 4 is connected with the first external machine heat exchanger 1 to form a closed circuit, and further includes a first four-way reversing valve 3, a second four-way reversing valve 4, a first stop valve 9, a third stop valve 11, a sixth stop valve 14 and a seventh stop valve 15.
A first throttling component is arranged between the first external machine heat exchanger 1 and the second external machine heat exchanger 2, and comprises a first throttling part 7 and a fifth stop valve 13 which are connected in series, and a fourth stop valve 12 which is connected with the first throttling part 7 and the fifth stop valve 13 which are connected in series in parallel at two ends.
A second throttling component is arranged between the second outer machine heat exchanger 2 and the inner machine heat exchanger 6, and comprises a second throttling element 8 and a ninth stop valve 17 which are connected in series, and an eighth stop valve 16 which is connected with the second throttling element 8 and the ninth stop valve 17 which are connected in series in parallel.
One end of the first cut valve 9 is connected to the C2 end of the second four-way selector valve 4, and the other end of the first cut valve 9 is connected to the S1 end of the first four-way selector valve 3.
Two ends of the third stop valve 11 are respectively connected with the first outer machine heat exchanger 1 and the end C1 of the first four-way reversing valve 3.
A seventh shut-off valve 15 is connected between the second external machine heat exchanger 2 and the second throttling assembly.
One end of the sixth cutoff valve 14 is connected between the second outdoor unit heat exchanger 2 and the seventh cutoff valve 15, and the other end of the sixth cutoff valve 14 is connected to the E1 end of the first four-way selector valve 3.
The end E2 of the second four-way reversing valve 4 is connected with the liquid inlet pipe of the inner machine heat exchanger 6.
The end D1 of the first four-way selector valve 3 is connected between the seventh cut-off valve 15 and the second throttling assembly.
Specifically, the defrosting system of this embodiment further includes a compressor 5, and a liquid pipe and an air pipe of the compressor 5 are respectively connected to the S2 end and the D2 end of the second four-way reversing valve 4.
Preferably, the first throttle 7 and the second throttle 8 are electronic expansion valves, capillary tubes or thermal expansion valves.
Based on the defrosting system without stopping the external unit provided by the above embodiment, the embodiment further provides a defrosting control method without stopping the external unit, including:
as shown in fig. 2, when a defrosting signal of the first external machine heat exchanger 1 is received, the first four-way selector valve 3 is controlled to communicate the end D1 with the end C1, the second four-way selector valve 4 is controlled to communicate the end D2 with the end E2, the first stop valve 9, the third stop valve 11, the fifth stop valve 13, the sixth stop valve 14 are controlled to communicate with the eighth stop valve 16, and the fourth stop valve 12, the seventh stop valve 15 and the ninth stop valve 17 are closed; high-temperature and high-pressure refrigerant compressed by the compressor 5 firstly enters the second four-way reversing valve 4 through the end D2, then enters the inner machine heat exchanger 6 through the end E2 for heat exchange, provides heat for indoor environment, then enters the end D1 of the first four-way reversing valve 3 through the eighth stop valve 16, and then enters the first outer machine heat exchanger 1 through the third stop valve 11 from the end C1 of the first four-way reversing valve 3, at the moment, the temperature of the refrigerant is relatively high, the temperature of the first outer machine heat exchanger 1 can be well improved, and defrosting is carried out on the first outer machine heat exchanger 1; after flowing through the first external machine heat exchanger 1, the refrigerant enters the first throttling element 7 for throttling, is changed into a low-temperature and low-pressure refrigerant, enters the second external machine heat exchanger 2 for heat exchange, flows through the sixth stop valve 14, enters the E1 end of the first four-way reversing valve 3, flows out of the S1 end of the first four-way reversing valve 3, flows through the first stop valve 9, returns to the C2 end of the second four-way reversing valve 4, and returns to the compressor 5 through the S2 end of the second four-way reversing valve 4, so that the circulation of the refrigerant is realized.
As shown in fig. 3, when a defrosting signal is received from the second outdoor unit heat exchanger 2, the first four-way selector valve 3 is controlled to communicate between the end D1 and the end E1, the second four-way selector valve 4 is controlled to communicate between the end D2 and the end E2, the first stop valve 9, the third stop valve 11, the fifth stop valve 13, the sixth stop valve 14 and the eighth stop valve 16 are controlled to communicate, and the fourth stop valve 12, the seventh stop valve 15 and the ninth stop valve 17 are closed; high-temperature and high-pressure refrigerant compressed by the compressor 5 firstly enters the second four-way reversing valve 4 through the D2 end, then enters the inner machine heat exchanger 6 through the E2 end for heat exchange, provides heat for indoor environment, then enters the D1 end of the first four-way reversing valve 3 through the eighth stop valve 16, and then enters the second outer machine heat exchanger 2 through the sixth stop valve 14 from the E1 end of the first four-way reversing valve 3, at the moment, the temperature of the refrigerant is relatively high, the temperature of the second outer machine heat exchanger 2 can be well improved, and defrosting is carried out on the second outer machine heat exchanger 2; after flowing through the second external machine heat exchanger 2, the refrigerant enters the first throttling element 7 for throttling, is changed into a low-temperature low-pressure refrigerant, then enters the first external machine heat exchanger 1 for heat exchange, then flows through the third stop valve 11, enters the C1 end of the first four-way reversing valve 3, flows out of the S1 end of the first four-way reversing valve 3, returns to the C2 end of the second four-way reversing valve 4 through the first stop valve 9, and returns to the compressor 5 through the S2 end of the second four-way reversing valve 4, so that the refrigerant circulation is realized.
In the defrosting system of the embodiment, two outer machine heat exchangers exchange heat simultaneously under the condition of heat supply. When the defrosting condition is triggered, one outer machine heat exchanger is defrosted, and the other outer machine heat exchanger continues to evaporate and absorb heat. And after defrosting is finished, the other outer machine heat exchanger can be immediately defrosted by changing the flow direction of the first four-way reversing valve 3 to convert, or the other outer machine heat exchanger is defrosted after waiting for a certain time, so that defrosting of the two outer machine heat exchangers can be alternately carried out, the heat exchange process of the outer machine heat exchanger is uninterrupted, and heat supply of the inner machine heat exchanger is uninterrupted. In the whole defrosting process, the problem of service life reduction caused by long-time use of a single outer machine heat exchanger is well solved while defrosting without stopping the machine is guaranteed, and meanwhile, the service life of the heat exchanger is prolonged.
On the basis of the defrosting control system without stopping the external unit, the embodiment further provides an air conditioner, which comprises the defrosting system without stopping the external unit in any of the above embodiments.
Specifically, the air conditioner comprises various air conditioners such as a wall-mounted air conditioner, a cabinet air conditioner, a multi-split air conditioner and an air duct machine, continuous heat supply can be achieved, and heat supply is uninterrupted during defrosting.
Preferably, as shown in fig. 4, the air conditioner further includes a second cut-off valve 10, one end of the second cut-off valve 10 is connected between the second four-way reversing valve 4 and the first cut-off valve 9, and the other end of the second cut-off valve 10 is connected to the first external unit heat exchanger 1.
When the air conditioner operates in a heating mode or a cooling mode, the circulation of the refrigerant can be realized without the first four-way reversing valve 3, specifically, the control process of the heating and cooling modes of the air conditioner and the flow direction of the refrigerant are as follows.
When the air conditioner operates in a heating mode, the first four-way reversing valve 3 can be communicated with the end D1 and the end C1, can be communicated with the end D1 and the end E1, and can also be disconnected.
When the first four-way reversing valve 3 communicates the end D1 with the end C1, the second four-way reversing valve 4 communicates the end D2 with the end E2, communicates the first stop valve 9, the third stop valve 11, the fourth stop valve 12, the sixth stop valve 14 with the ninth stop valve 17, and closes the second stop valve 10, the fifth stop valve 13, the seventh stop valve 15 with the eighth stop valve 16; high-temperature and high-pressure refrigerant compressed by the compressor 5 firstly enters the second four-way reversing valve 4 through the end D2, then enters the inner machine heat exchanger 6 through the end E2 for heat exchange, provides heat for indoor environment, then enters the second throttling element 8 for throttling through the ninth stop valve 17, then enters the end D1 of the first four-way reversing valve 3, then flows through the third stop valve 11 from the end C1 of the first four-way reversing valve 3 to enter the first outer machine heat exchanger 1 for heat exchange, then flows through the fourth stop valve 12 to enter the second outer machine heat exchanger 2 for heat exchange, then flows through the sixth stop valve 14 to enter the end E1 of the first four-way reversing valve 3, then flows out from the end S1 of the first four-way reversing valve 3, flows through the first stop valve 9 to return to the end C2 of the second four-way reversing valve 4, and then returns to the compressor 5 through the end S2 of the second four-way reversing valve 4, so that circulation.
When the first four-way reversing valve 3 communicates the end D1 with the end E1, the second four-way reversing valve 4 communicates the end D2 with the end E2, communicates the first stop valve 9, the third stop valve 11, the fourth stop valve 12, the sixth stop valve 14 with the ninth stop valve 17, and closes the second stop valve 10, the fifth stop valve 13, the seventh stop valve 15 with the eighth stop valve 16; high-temperature and high-pressure refrigerant compressed by the compressor 5 firstly enters the second four-way reversing valve 4 through the end D2, then enters the inner machine heat exchanger 6 through the end E2 for heat exchange, provides heat for indoor environment, then enters the second throttling element 8 for throttling through the ninth stop valve 17, then enters the end D1 of the first four-way reversing valve 3, then flows through the sixth stop valve 14 from the end E1 of the first four-way reversing valve 3 to enter the second outer machine heat exchanger 2 for heat exchange, then flows through the fourth stop valve 12 to enter the first outer machine heat exchanger 1 for heat exchange, then flows through the third stop valve 11 to enter the end C1 of the first four-way reversing valve 3, then flows out from the end S1 of the first four-way reversing valve 3, flows through the first stop valve 9 to return to the end C2 of the second four-way reversing valve 4, and then returns to the compressor 5 through the end S2 of the second four-way reversing valve 4, so that circulation of.
As shown in fig. 5, when the first four-way selector valve 3 is disconnected, the second four-way selector valve 4 connects the end D2 and the end E2, connects the second stop valve 10, the fourth stop valve 12, the seventh stop valve 15, and the ninth stop valve 17, and closes the first stop valve 9, the third stop valve 11, the fifth stop valve 13, the sixth stop valve 14, and the eighth stop valve 16; high-temperature and high-pressure refrigerant compressed by the compressor 5 firstly enters the second four-way reversing valve 4 through the end D2 and then enters the inner machine heat exchanger 6 through the end E2 to exchange heat, heat is provided for indoor environment, then enters the second throttling piece 8 through the ninth stop valve 17 to throttle, then flows through the seventh stop valve 15 to enter the second outer machine heat exchanger 2 to exchange heat, then flows through the fourth stop valve 12 to enter the first outer machine heat exchanger 1 to exchange heat, then flows through the second stop valve 10 to return to the end C2 of the second four-way reversing valve 4, and then returns to the compressor 5 through the end S2 of the second four-way reversing valve 4, so that the circulation of the refrigerant is realized.
When the air conditioner operates in a cooling mode, the first four-way reversing valve 3 is disconnected. Referring to fig. 6, the second four-way selector valve 4 communicates between the end D2 and the end C2, communicates between the second cut valve 10, the fourth cut valve 12, the seventh cut valve 15, and the ninth cut valve 17, closes the first cut valve 9, the high-temperature and high-pressure refrigerant compressed by the compressor 5 firstly enters the second four-way reversing valve 4 through the end D2, then enters the first outer machine heat exchanger 1 through the second stop valve 10 through the end C2 for heat exchange, then enters the second outer machine heat exchanger 2 through the fourth stop valve 12 for heat exchange, then enters the second throttling element 8 through the seventh stop valve 15 for throttling, then enters the inner machine heat exchanger 6 through the ninth stop valve 17 for heat exchange, then enters the end E2 of the second four-way reversing valve 4, and then returns to the compressor 5 through the end S2 of the second four-way reversing valve 4, so that the circulation of the refrigerant is realized.
Preferably, the air conditioner further comprises fans, the number of the fans is the same as the number of the heat exchangers (the sum of the number of the outer machine heat exchangers and the number of the inner machine heat exchangers), specifically, when the outer machine heat exchangers defrost, the fans can accelerate heat exchange between the heat exchangers and the external environment, the rotating speed of the fans can be increased during defrosting, the defrosting process is accelerated, and the defrosting time is shortened.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. The defrosting system without stopping the outdoor unit is characterized by comprising a first outdoor unit heat exchanger (1), a second outdoor unit heat exchanger (2), a first four-way reversing valve (3), a first throttling assembly, a second throttling assembly and a seventh stop valve (15);
the first external machine heat exchanger (1), the first throttling assembly, the second external machine heat exchanger (2), a seventh stop valve (15) and the second throttling assembly are sequentially connected in series;
the S1 end of the first four-way reversing valve (3) is connected with a compression system, the C1 end of the first four-way reversing valve (3) is connected with the first outer machine heat exchanger (1), the E1 end of the first four-way reversing valve (3) is connected between the second outer machine heat exchanger (2) and the seventh stop valve (15), and the D1 end of the first four-way reversing valve (3) is connected between the seventh stop valve (15) and the second throttling assembly.
2. The outdoor unit non-stop defrosting system of claim 1 further comprising an indoor unit heat exchanger (6), wherein the air pipe and the liquid pipe of the indoor unit heat exchanger (6) are respectively connected with the compression system and the second throttling assembly.
3. The outdoor unit non-stop defrosting system according to claim 2, wherein the compression system comprises a compressor (5) and a second four-way reversing valve (4), the C2 end of the second four-way reversing valve (4) is connected to the S1 end of the first four-way reversing valve (3), the D2 end of the second four-way reversing valve (4) is connected to the air pipe of the compressor (5), the E2 end of the second four-way reversing valve (4) is connected to the indoor unit heat exchanger (6), and the S2 end of the second four-way reversing valve (4) is connected to the liquid pipe of the compressor (5).
4. The outdoor unit non-stop defrosting system according to claim 3, further comprising a first stop valve (9), a third stop valve (11), and a sixth stop valve (14);
the first stop valve (9) is arranged between the end C2 of the second four-way reversing valve (4) and the end S1 of the first four-way reversing valve (3), the third stop valve (11) is arranged between the ends C1 of the first outdoor unit heat exchanger (1), one end of the sixth stop valve (14) is connected between the second outdoor unit heat exchanger (2) and the seventh stop valve (15), and the other end of the sixth stop valve (14) is connected with the end E1 of the first four-way reversing valve (3).
5. The outdoor unit non-stop defrosting system according to any one of claims 1 to 4, wherein the first throttling assembly includes a first throttling part (7) and a fifth stop valve (13) connected in series, and a fourth stop valve (12) connected in parallel with both ends of the first throttling part (7) and the fifth stop valve (13) connected in series;
the second throttling assembly comprises a second throttling piece (8) and a ninth stop valve (17) which are connected in series, and an eighth stop valve (16) which is connected with the second throttling piece (8) and the ninth stop valve (17) in series in parallel.
6. The outdoor unit non-stop defrosting system according to claim 5, wherein the first throttle member (7) and the second throttle member (8) are electronic expansion valves, capillary tubes or thermal expansion valves.
7. An outdoor unit non-stop defrosting control method applied to the outdoor unit non-stop defrosting system according to any one of claims 1 to 6, comprising:
when a defrosting signal of the first outer machine heat exchanger (1) is received, the first four-way reversing valve (3) is controlled to be communicated with the end D1 and the end C1, the second four-way reversing valve (4) is controlled to be communicated with the end D2 and the end E2, the first stop valve (9), the third stop valve (11), the fifth stop valve (13), the sixth stop valve (14) and the eighth stop valve (16) are controlled to be communicated, and the fourth stop valve (12), the seventh stop valve (15) and the ninth stop valve (17) are closed;
when a defrosting signal of a second outdoor unit heat exchanger (2) is received, a first four-way reversing valve (3) is controlled to be communicated with a D1 end and an E1 end, a second four-way reversing valve (4) is controlled to be communicated with a D2 end and an E2 end, the first stop valve (9), the third stop valve (11), the fifth stop valve (13), the sixth stop valve (14) and the eighth stop valve (16) are controlled to be communicated, and the fourth stop valve (12), the seventh stop valve (15) and the ninth stop valve (17) are closed.
8. A computer-readable storage medium, characterized in that it stores a computer program which, when read and executed by a processor, implements the defrost control method of claim 7.
9. An air conditioner comprising the outdoor unit non-stop defrosting system of any one of claims 1 to 6, further comprising a computer-readable storage medium storing a computer program and a processor, wherein when the computer program is read and executed by the processor, the defrosting control method of claim 7 is implemented.
10. The air conditioner according to claim 9, further comprising a second cut-off valve (10), wherein one end of the second cut-off valve (10) is connected between the second four-way selector valve (4) and the first cut-off valve (9), and the other end of the second cut-off valve (10) is connected to the first outdoor unit heat exchanger (1).
CN201911124877.0A 2019-11-18 2019-11-18 Defrosting system and control method for outdoor unit without stopping and air conditioner Pending CN110726173A (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08159621A (en) * 1994-12-08 1996-06-21 Hitachi Ltd Air conditioner
JP2001056159A (en) * 1999-06-11 2001-02-27 Daikin Ind Ltd Air conditioner
JP2006317063A (en) * 2005-05-12 2006-11-24 Sharp Corp Air conditioner
CN101788206A (en) * 2009-07-03 2010-07-28 曾华文 Outdoor double heat exchanger defrosting low-temperature heating system
CN104930618A (en) * 2015-05-26 2015-09-23 广东美的制冷设备有限公司 Air conditioner and method for controlling air conditioner
CN105066255A (en) * 2015-09-01 2015-11-18 珠海格力电器股份有限公司 Air conditioning system with continuous heat supply function in defrosting process
CN211060240U (en) * 2019-11-18 2020-07-21 宁波奥克斯电气股份有限公司 Outer quick-witted defrosting system and air conditioner that do not shut down

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08159621A (en) * 1994-12-08 1996-06-21 Hitachi Ltd Air conditioner
JP2001056159A (en) * 1999-06-11 2001-02-27 Daikin Ind Ltd Air conditioner
JP2006317063A (en) * 2005-05-12 2006-11-24 Sharp Corp Air conditioner
CN101788206A (en) * 2009-07-03 2010-07-28 曾华文 Outdoor double heat exchanger defrosting low-temperature heating system
CN104930618A (en) * 2015-05-26 2015-09-23 广东美的制冷设备有限公司 Air conditioner and method for controlling air conditioner
CN105066255A (en) * 2015-09-01 2015-11-18 珠海格力电器股份有限公司 Air conditioning system with continuous heat supply function in defrosting process
CN211060240U (en) * 2019-11-18 2020-07-21 宁波奥克斯电气股份有限公司 Outer quick-witted defrosting system and air conditioner that do not shut down

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