CN108548252B - Control method and device of air conditioning system - Google Patents

Control method and device of air conditioning system Download PDF

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Publication number
CN108548252B
CN108548252B CN201810294680.0A CN201810294680A CN108548252B CN 108548252 B CN108548252 B CN 108548252B CN 201810294680 A CN201810294680 A CN 201810294680A CN 108548252 B CN108548252 B CN 108548252B
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China
Prior art keywords
temperature
throttling
air conditioning
control
compressor
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CN201810294680.0A
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Chinese (zh)
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CN108548252A (en
Inventor
崔俊
徐佳佳
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Qingdao Haier Air Conditioner Gen Corp Ltd
Haier Zhijia Co Ltd
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Qingdao Haier Air Conditioner Gen Corp Ltd
Haier Zhijia Co Ltd
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Priority to CN201810294680.0A priority Critical patent/CN108548252B/en
Publication of CN108548252A publication Critical patent/CN108548252A/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0003Exclusively-fluid systems
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/62Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63Electronic processing
    • F24F11/64Electronic processing using pre-stored data
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/70Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/86Control 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/89Arrangement or mounting of control or safety devices
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B13/00Compression machines, plant or systems with reversible cycle
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B41/00Fluid-circulation arrangements
    • F25B41/30Expansion means; Dispositions thereof
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B43/00Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • F25B43/006Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat accumulators
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00Control inputs relating to air properties
    • F24F2110/10Temperature
    • F24F2110/12Temperature of the outside air
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The invention discloses a control method and device of an air conditioning system, and belongs to the technical field of air conditioners. The control method comprises the following steps: acquiring an outdoor environment temperature Tao and a radiating fin temperature Tx; and if the temperature difference value between the outdoor environment temperature Tao and the cooling fin temperature Tx is not less than the preset temperature difference threshold value, correcting the target exhaust temperature of the compressor, and controlling and adjusting the opening of the throttling device until the temperature difference value between the outdoor environment temperature Tao and the cooling fin temperature Tx is less than the preset temperature difference threshold value when the compressor runs at the corrected exhaust temperature. The control method of the air conditioning system provided by the invention can simultaneously meet the temperature protection requirement of the electric control and the performance requirement of the air conditioning system on the exhaust temperature of the compressor, and effectively ensure the overall safe and effective operation of the air conditioning system.

Description

Control method and device of air conditioning system
Technical Field
The invention relates to the technical field of air conditioning systems, in particular to a control method and device of an air conditioning system.
Background
In the existing fixed-frequency or variable-frequency air conditioning system products in the market, in the operation process of an air conditioning system, electric controls such as a computer board and a single chip microcomputer of the air conditioning system can generate a large amount of heat, the temperature of the electric controls is increased along with the heat, and when the temperature of the electric controls is too high, a high-temperature protection mechanism for stopping the air conditioning system can be triggered. In order to solve the problem that the temperature of the electric control part is too high, a cooling loop is additionally arranged in part of the existing air conditioning system, and the electric control part is cooled by utilizing a refrigerant of the air conditioning system.
One of the structural forms of a cooling circuit in the prior art is that one section of the cooling circuit is connected to a refrigerant pipeline section between an indoor heat exchanger and an outdoor heat exchanger of an air conditioning system, and the other end of the cooling circuit is connected to a return air port of a compressor; when the cooling circuit works, part of refrigerants flowing through the refrigerant pipeline section connected with the cooling circuit can be distributed, so that the electric control part is cooled through the low-temperature refrigerants, and the refrigerants absorbing heat flow back to the compressor. The structure has certain disadvantages, and the temperature of partial refrigerant flowing through the refrigerant pipeline is often different from that of the refrigerant flowing back to the compressor along the normal refrigerant circulation pipeline because the partial refrigerant absorbs heat, so that the refrigerant flowing into the compressor from the cooling pipeline has certain influence on the temperature of the whole refrigerant flowing back to the compressor, and the temperature of the refrigerant discharged by the compressor operating at the rated frequency can be further changed along with the influence. Therefore, when the cooling pipeline is started, the heat exchange performance of the air conditioning system is affected to a certain extent, so that the actual operation parameters of the air conditioning system are inconsistent with the set parameters, for example, the actual exhaust temperature of the compressor is too high or too low, and the like, and the instability of the operation of the air conditioning system is increased.
Disclosure of Invention
The invention provides a control method and a control device of an air conditioning system, and aims to solve the problem that the air conditioning system can cause fluctuation influence on self operating parameters when an electric control piece is cooled. The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key/critical elements nor delineate the scope of such embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.
According to a first aspect of the present invention, a control method of an air conditioning system is provided, the air conditioning system includes a refrigerant circulation loop and a cooling branch, the refrigerant circulation loop includes an indoor heat exchanger, an outdoor heat exchanger, a four-way valve, a reservoir and a compressor which are connected by a refrigerant pipe, a first end of the cooling branch is connected to a flash tank of a refrigerant pipe section between the indoor heat exchanger and the outdoor heat exchanger, a second end of the cooling branch is connected to an inlet end of the reservoir, and the cooling branch is provided with a heat dissipation device; the air conditioning system also comprises an electric control piece, wherein the electric control piece, the heat dissipation device and the liquid storage device are arranged adjacently, and heat exchange can be carried out among the electric control piece, the heat dissipation device and the liquid storage device; the air conditioning system also comprises a throttling device, wherein the throttling device comprises a first throttling device arranged at a first refrigerant subsection between the flash evaporator and the outdoor heat exchanger, a second throttling device arranged at a second refrigerant subsection between the flash evaporator and the indoor heat exchanger, and a third throttling device arranged at the cooling branch; the control method comprises the following steps:
acquiring an outdoor environment temperature Tao and a radiating fin temperature Tx;
and if the temperature difference value between the outdoor environment temperature Tao and the cooling fin temperature Tx is not less than the preset temperature difference threshold value, correcting the target exhaust temperature of the compressor, and controlling and adjusting the opening of the throttling device until the temperature difference value between the outdoor environment temperature Tao and the cooling fin temperature Tx is less than the preset temperature difference threshold value when the compressor runs at the corrected exhaust temperature.
In an optional embodiment, the control method further comprises: and if the temperature difference value between the outdoor environment temperature Tao and the cooling fin temperature Tx is smaller than a preset temperature difference threshold value, controlling and adjusting the opening of the throttling device until the target exhaust temperature of the compressor is reached.
In an alternative embodiment, controlling the opening of the throttle device comprises: the opening of the throttling device on the inflow side of the flash tank is controlled to be reduced.
In an alternative embodiment, modifying the target discharge temperature of the compressor comprises: and controlling to reduce the target exhaust temperature of the compressor to a corrected value by adjusting the operating parameters of the compressor, wherein the corrected exhaust temperature is the target exhaust temperature.
In an optional embodiment, the control method further comprises: and determining the target exhaust temperature according to the outdoor environment temperature Tao and a preset rule, wherein the preset rule is used for representing the incidence relation between the outdoor environment temperature Tao and the target exhaust temperature.
According to the second aspect of the invention, the invention also provides a control device of an air conditioning system, the air conditioning system comprises a refrigerant circulation loop and a cooling branch, the refrigerant circulation loop comprises an indoor heat exchanger, an outdoor heat exchanger, a four-way valve, a liquid accumulator and a compressor which are connected through a refrigerant pipe, the first end of the cooling branch is connected to the flash tank of the refrigerant pipe section between the indoor heat exchanger and the outdoor heat exchanger, the second end of the cooling branch is connected to the inlet end of the liquid accumulator, and the cooling branch is provided with a heat dissipation device; the air conditioning system also comprises an electric control piece, wherein the electric control piece, the heat dissipation device and the liquid storage device are arranged adjacently, and heat exchange can be carried out among the electric control piece, the heat dissipation device and the liquid storage device; the air conditioning system also comprises a throttling device, wherein the throttling device comprises a first throttling device arranged at a first refrigerant subsection between the flash evaporator and the outdoor heat exchanger, a second throttling device arranged at a second refrigerant subsection between the flash evaporator and the indoor heat exchanger, and a third throttling device arranged at the cooling branch; the control device includes:
an acquisition unit for acquiring an outdoor ambient temperature Tao and a fin temperature Tx;
and the first control unit is used for correcting the target exhaust temperature of the compressor and controlling and adjusting the opening of the throttling device if the temperature difference value between the outdoor environment temperature Tao and the cooling fin temperature Tx is not less than the preset temperature difference threshold value, until the compressor runs at the corrected exhaust temperature, the temperature difference value between the outdoor environment temperature Tao and the cooling fin temperature Tx is less than the preset temperature difference threshold value.
In an alternative embodiment, the control device further comprises a second control unit for: and if the temperature difference value between the outdoor environment temperature Tao and the cooling fin temperature Tx is smaller than a preset temperature difference threshold value, controlling and adjusting the opening of the throttling device until the target exhaust temperature of the compressor is reached.
In an alternative embodiment, the first control unit is in particular adapted to controlling the opening of the throttling means that reduces the inflow side of the flash tank;
the second control unit is specifically adapted to controlling the opening of the throttling means reducing the inflow side of the flash tank.
In an optional implementation manner, the first control unit is specifically configured to: and controlling to reduce the target exhaust temperature of the compressor to a corrected value by adjusting the operating parameters of the compressor, wherein the corrected exhaust temperature is the target exhaust temperature.
In an alternative embodiment, the control device further comprises a determination unit for: and determining the target exhaust temperature according to the outdoor environment temperature Tao and a preset rule, wherein the preset rule is used for representing the incidence relation between the outdoor environment temperature Tao and the target exhaust temperature.
The invention adopts the technical scheme and has the beneficial effects that:
the control method of the air conditioning system provided by the invention can change the current running state of the air conditioning system by correcting the target exhaust temperature of the compressor and adjusting the opening of the throttling device in a mode of correcting the target exhaust temperature of the compressor and adjusting the opening of the throttling device under the condition that the temperature difference value between the outdoor environment temperature Tao and the cooling fin temperature Tx is not less than the preset temperature difference threshold value, so that the temperature difference value between the outdoor environment temperature Tao and the cooling fin temperature Tx is less than the preset temperature difference threshold value when the compressor runs at the corrected exhaust temperature, the temperature protection requirement of the electric control and the performance requirement of the air conditioning system on the exhaust temperature of the compressor can be met at the same time, and the whole safe and effective running of the air conditioning system is effectively ensured.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a schematic block diagram of an air conditioning system of the present invention according to an exemplary embodiment;
fig. 2 is a first flowchart illustrating a control method of the air conditioning system according to the present invention according to the first embodiment (a);
fig. 3 is a second flowchart illustrating a control method of the air conditioning system according to the present invention in the first embodiment (a);
fig. 4 is a first flowchart illustrating a control method of the air conditioning system according to the second embodiment of the present invention;
fig. 5 is a second flowchart illustrating a control method of the air conditioning system according to the second embodiment of the present invention;
fig. 6 is a first flowchart illustrating a control method of the air conditioning system according to the present invention in the third embodiment (a);
fig. 7 is a flowchart illustrating a control method of the air conditioning system according to the second embodiment (a);
fig. 8 is a first flowchart illustrating a control method of the air conditioning system according to the present invention in accordance with the fourth embodiment (a);
fig. 9 is a flowchart illustrating a control method of the air conditioning system according to the second embodiment (a);
fig. 10 is a first flowchart illustrating a control method of the air conditioning system according to the present invention in the embodiment (v);
fig. 11 is a flowchart illustrating a control method of the air conditioning system according to the second embodiment (v);
fig. 12 is a flowchart illustrating a control method of the air conditioning system according to the present invention shown in the embodiment (six);
fig. 13 is a block diagram showing the construction of a control device of an air conditioning system of the present invention according to the embodiment (one);
fig. 14 is a block diagram showing the configuration of a control device of the air conditioning system of the present invention according to the second embodiment (a);
fig. 15 is a block diagram showing the configuration of a control device of the air conditioning system of the present invention according to the embodiment (three);
fig. 16 is a block diagram showing the configuration of a control device of the air conditioning system of the present invention according to the embodiment (four);
fig. 17 is a block diagram showing the configuration of a control device of the air conditioning system of the present invention according to the embodiment (five);
fig. 18 is a block diagram showing the configuration of a control device of an air conditioning system of the present invention according to the sixth embodiment.
11, a first heat exchanger; 12. a second heat exchanger;
2. a compressor; 3. a four-way valve; 4. a reservoir;
51. a flash tank; 52. a cooling branch; 53. a heat sink;
61. a first pipeline; 62. a second pipeline;
71. a first refrigerant pipe section; 72. a second refrigerant pipe section;
81. a first throttling device; 82. a second throttling device; 83. and a third throttling device.
Detailed Description
The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The scope of embodiments of the invention encompasses the full ambit of the claims, as well as all available equivalents of the claims. Embodiments may be referred to herein, individually or collectively, by the term "invention" merely for convenience and without intending to voluntarily limit the scope of this application to any single invention or inventive concept if more than one is in fact disclosed. Herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method or apparatus that comprises the element. The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. As for the methods, products and the like disclosed by the embodiments, the description is simple because the methods correspond to the method parts disclosed by the embodiments, and the related parts can be referred to the method parts for description.
Fig. 1 is a schematic structural view of an air conditioning system of the present invention according to an exemplary embodiment.
Fig. 1 shows an alternative structure of an air conditioning system to which the control method of the present invention is applied, and specifically, the air conditioning system includes an indoor unit and an outdoor unit, where the indoor unit includes a first heat exchanger 11 for exchanging heat with an indoor environment, the outdoor unit includes a second heat exchanger 12 for exchanging heat with an outdoor environment, a compressor 2 for providing circulating power for a refrigerant, a four-way valve 3 for switching a flow direction of the refrigerant by valve switching, and a liquid reservoir 4 for filtering, separating, and storing the refrigerant flowing back to the compressor 2; the computer board, the singlechip and other electrical control components are arranged in the outdoor unit.
The first heat exchanger 11, the second heat exchanger 12, the four-way valve 3, the liquid storage device 4 and the compressor 2 are communicated through a first pipeline 61 and a second pipeline 62 and are used for forming a conventional refrigerant circulation loop, in the embodiment, when the air conditioning system runs in a refrigeration mode in summer, a refrigerant after exchanging heat with an outdoor environment flows out of the second heat exchanger 12 and flows into the first heat exchanger 11 through the first pipeline 61, meanwhile, the refrigerant after exchanging heat with an indoor environment flows out of the first heat exchanger 11 and flows into the second heat exchanger 12 through the second pipeline 62, and through the refrigerant circulation process, the refrigeration and cooling functions of the air conditioning system on the indoor environment can be realized.
Similarly, when the air-conditioning system operates in the heating mode in winter, the refrigerant flows between the first heat exchanger 11 and the second heat exchanger 12 in the direction opposite to the cooling mode, so that the heating and warming functions of the air-conditioning system on the indoor environment can be realized.
In an embodiment, the electrical control is disposed adjacent to the reservoir 4. Generally, the temperature of the refrigerant that flows back to reservoir 4 is lower, and is mostly less than the self temperature of the temperature rise that automatically controlled spare operation intensifies or receives the outdoor temperature to influence the temperature rise that leads to, like this, with the adjacent reservoir 4 setting of automatically controlled spare, can utilize the low temperature refrigerant in the reservoir 4 to absorb the heat of electrical control, electrical control is after carrying out the heat exchange with the refrigerant of reservoir 4, self temperature reduces, thereby can avoid because of the burnout that automatically controlled spare high temperature caused, trigger shutdown protection scheduling problem.
Here, the casing of the liquid storage device 4 is preferably made of a material that easily conducts heat, such as a metal material, so that the heat conduction efficiency between the refrigerant and the electric control member can be improved, and the cooling rate of the electric control member can be increased.
In practice, the electrical control member may be disposed directly against the outer surface of the reservoir 4, or may be spaced apart from the outer surface.
Except the above-mentioned conventional refrigerant circulation loop, the utility model discloses an air conditioning system still includes the cooling tube nest for the too high problem of temperature when solving the electrical control component work.
Specifically, the cooling tube group mainly includes two parts, namely a cooling assembly and a cooling branch 52, wherein the cooling assembly mainly includes:
the flash evaporator 51 is connected to the first pipeline 61, can evaporate part of liquid refrigerant flowing through the first pipeline 61 into gaseous refrigerant, and conveys the gaseous refrigerant to the cooling branch 52, so that the gaseous refrigerant is used as a heat exchange medium in the subsequent cooling process of the cooling branch 52;
the heat dissipation device 53 and the heat dissipation device 53 are connected to the cooling branch 52 and are arranged close to the electric control part, and most of the electric control parts are arranged in semi-closed containers such as an electric control box, so that the heat dissipation device 53 can also be used as a heat exchange carrier of gaseous refrigerants and ambient air of the electric control part, and the ambient air of the electric control part is cooled, so that the temperature of the electric control part can be controlled below a safe working temperature.
The cooling branch 52 is connected at a first end to the flash tank 51 of the refrigerant pipe section between the indoor heat exchanger and the outdoor heat exchanger and at a second end to the inlet end of the accumulator 4.
The specific structure and type of the heat dissipation device 53 can be determined according to the structure of the outdoor unit, and in the embodiment, the type of the heat dissipation device 53 disposed on the cooling branch 52 is a parallel flow heat exchanger, which has the advantages of high heat exchange rate, small occupied space, and the like, and is suitable for the outdoor unit structure of the air conditioning system with a compact structure.
Optionally, in the structure of the heat dissipation device 53 shown in fig. 1, one or more U-shaped grooves are formed in the parallel flow heat exchanger, and the U-shaped grooves are sequentially connected to each other and may be used to distribute a part of the pipe sections of the cooling branch 52 disposed in the parallel flow heat exchanger. The U-shaped pipe grooves can enable part of pipe sections of the cooling branch 52 to be arranged in the parallel flow heat exchanger in an approximate S-shaped or snake-shaped mode, so that the number and the heat conducting area of the cooling branch 52 and the radiating fins of the parallel flow heat exchanger can be increased, and the heat conducting efficiency of the radiator is improved.
The air conditioning system of the present invention further comprises a throttling device, the throttling device comprises a first throttling device 81 of the first refrigerant section 71 arranged between the flash evaporator 51 and the outdoor heat exchanger, a second throttling device 82 of the second refrigerant section 72 arranged between the flash evaporator 51 and the indoor heat exchanger, and a third throttling device 83 arranged on the cooling branch 52. Here, the first refrigerant branch 71 and the second refrigerant branch 72 are both part of the first pipe 61 described above.
The first throttling device 81 can change the flow rate and the throttling parameters (such as the refrigerant temperature and the refrigerant pressure) of the refrigerant flowing through the first throttling device by adjusting the opening degree of the first throttling device, so that the flow rate and the throttling parameters of the refrigerant flowing through the first refrigerant section 71 between the flash evaporator 51 and the outdoor heat exchanger are adjusted.
The second throttling device 82 may change the flow rate and the throttling parameter (such as the refrigerant temperature and the refrigerant pressure) of the refrigerant flowing through the second throttling device by adjusting the opening degree of the second throttling device, so as to adjust the flow rate and the throttling parameter of the refrigerant flowing through the second refrigerant branch section 72 between the flash tank 51 and the indoor heat exchanger.
The third throttling device 83 can adjust the flow rate and the throttling parameter of the refrigerant flowing through the cooling branch 52 by adjusting the opening of the valve thereof to change the flow rate and the throttling parameter (such as the temperature and the pressure of the refrigerant) of the refrigerant flowing through the third throttling device. In the construction shown in fig. 1, a third throttling device 83 is provided on the pipe section of the cooling branch 52 between the second end of the cooling branch 52 and the parallel flow heat exchanger.
In the following, specific flows of various embodiments of the control method of the present invention are described in detail with reference to the above-mentioned optional air conditioning system to which the control method of the present invention is applied.
Example 1
Fig. 2 is a first flowchart illustrating a control method of the air conditioning system according to the first embodiment of the present invention.
As shown in fig. 2, the present invention provides a control method of an air conditioning system, and the main control flow of the control method may include:
s201, acquiring outdoor environment temperature Tao;
in this embodiment, the outdoor unit of the air conditioning system is configured with another temperature sensor, the temperature sensor can be used to detect a current temperature parameter of the outdoor environment, and the current temperature parameter detected by the temperature sensor disposed in the outdoor unit can be obtained in step S201 and is used as the outdoor environment temperature Tao.
Or, the air conditioning system of the present invention accesses the external network through the home lan, and may search the outdoor environment data corresponding to the coordinate position of the air conditioner from the server of the air conditioning product service provider or the network platform providing the weather data information, where the outdoor environment data includes the current temperature parameter of the outdoor environment, and thus, the current temperature parameter of the outdoor environment obtained by the search in step S201 may be used as the outdoor environment temperature Tao.
S202, acquiring the temperature Tx of the radiating fin;
in this embodiment, the outdoor unit of the air conditioning system is configured with another temperature sensor, the sensing end of the temperature sensor is disposed on the heat sink of the heat sink, and is configured to detect a current temperature parameter of the heat sink, and the current temperature parameter detected by the temperature sensor can be obtained in step S202 and is used as the temperature Tx of the heat sink.
In some embodiments, the heat sink temperature Tx may reflect the real-time temperature of the electrical control to some extent, because the heat sink temperature Tx may exchange heat with the electrical control, and finally reach the same or similar temperature, and in other embodiments, the heat sink temperature Tx may also be replaced by the real-time temperature data of the electrical control collected by the temperature sensor.
S203, if the temperature difference value between the outdoor environment temperature Tao and the cooling fin temperature Tx is not smaller than the preset temperature difference threshold value, correcting the target exhaust temperature of the compressor, and controlling and adjusting the opening of the throttling device until the temperature difference value between the outdoor environment temperature Tao and the cooling fin temperature Tx is smaller than the preset temperature difference threshold value when the compressor runs at the corrected exhaust temperature.
Here, the air conditioning system is pre-stored with one or more temperature difference thresholds, which may be used to characterize a temperature threshold that may place the electrical control in a safe operating state, or may trigger a high temperature shutdown protection of the air conditioner. That is, under the temperature condition that the temperature difference value between the outdoor environment temperature Tao and the cooling fin temperature Tx is not less than the preset temperature difference threshold, the electric control part is in an unsafe working state that is easy to damage and burn or may cause the air conditioning system to trigger a high-temperature shutdown protection mode, and at this time, the whole air conditioning system is in abnormal operation, which may have adverse effects on the operation performance of the air conditioning system; and under the temperature condition that the temperature difference value between the outdoor environment temperature Tao and the cooling fin temperature Tx is smaller than the preset temperature difference threshold value, the electric control part is in a safe working state or the air conditioning system cannot trigger a high-temperature shutdown protection mode, at the moment, the whole air conditioning system is in normal operation, and the influence of the external temperature on the operation performance of the air conditioning system is small.
In this embodiment, in order to facilitate comparison between the temperature difference value and the temperature difference threshold, the temperature difference value is generally an absolute value of a difference between the outdoor ambient temperature Tao and the heat sink temperature Tx.
Therefore, under the temperature condition that the temperature difference value between the outdoor environment temperature Tao and the cooling fin temperature Tx is not less than the preset temperature difference threshold value, the electric control part is easy to damage and trigger high-temperature protection, the current operation state of the air conditioning system is changed by correcting the target exhaust temperature of the compressor and adjusting the opening of the throttling device, so that when the compressor operates at the corrected exhaust temperature, the temperature difference value between the outdoor environment temperature Tao and the cooling fin temperature Tx is less than the preset temperature difference threshold value, the temperature protection requirement of the electric control part and the performance requirement of the air conditioning system on the exhaust temperature of the compressor can be met simultaneously, and the whole safe and effective operation of the air conditioning system is effectively guaranteed.
Optionally, if the temperature difference between the outdoor ambient temperature Tao and the cooling fin temperature Tx is smaller than a preset temperature difference threshold, and at this time, the air conditioner is in a normal operation state, the current exhaust temperature of the compressor may be adjusted to a target exhaust temperature, so that the temperature requirement of the air conditioner for heat exchange of a refrigerant is met; therefore, the control method further includes: and controlling and adjusting the opening of the throttling device until the target exhaust temperature of the compressor is reached.
Here, the air conditioning system is provided with a program such as an operation algorithm of a target exhaust temperature, and the target exhaust temperature of the compressor suitable for the current working condition can be automatically calculated by obtaining one or more parameters set by a user, for example, the air conditioning system is provided with a temperature mapping table, which can be used for representing a mapping relation between a user-set temperature and the exhaust temperature of the compressor, and setting parameters corresponding to each exhaust temperature, for example, when the user-set temperature is 23 ℃, the exhaust temperature of the compressor mapped by the mapping table is 70 ℃; the user sets a temperature of 26 c, which maps to a compressor discharge temperature of 65 c, and so on. After the set temperature of the user is determined, the exhaust temperature of the compressor and the corresponding set parameters can be determined according to the mapping table, and the operation of relevant parts of the air conditioning system is adjusted, so that the actual exhaust temperature of the compressor reaches the exhaust temperature. Here, the exhaust gas temperature is the aforementioned target exhaust gas temperature.
Here, the user-set temperature is a desired temperature parameter input to the air conditioning system by the user through a remote controller or a control panel.
Or determining the target exhaust temperature according to the outdoor environment temperature Tao and a preset rule, wherein the preset rule is used for representing the incidence relation between the outdoor environment temperature Tao and the target exhaust temperature.
It should be understood that the determination manner of the target exhaust temperature is not limited to the mapping table, and the target exhaust temperature may be determined by calculation through a mapping relationship of other parameters or other algorithms, which is not limited to this invention.
In this embodiment, after the air conditioner is turned on, the discharge temperature of the compressor is first adjusted to the target discharge temperature according to the above-mentioned setting parameters, and then the temperature of the electric control unit changes with the continuous operation of the air conditioner and the continuous change of the outdoor temperature, so the temperature difference between the outdoor ambient temperature Tao and the temperature Tx of the heat sink changes continuously, which makes the temperature of the refrigerant flowing back to the compressor not unique, therefore, after the compressor of the air conditioning system operates for a period of time, although the compressor still operates with the setting parameters, the actual discharge temperature often does not conform to the target discharge temperature, and the readjustment of the setting parameters is more variable, the process is complex, and most air conditioning systems do not set the related secondary calculation algorithm, therefore, on the premise that the setting parameters of the air conditioning system are not reset, the temperature of the refrigerant flowing back to the compressor is changed by adjusting the opening degree of one or more throttling devices, so that the actual exhaust temperature of the adjusted compressor can be consistent with the target exhaust temperature, the heat exchange requirement of the air conditioner is met, and the secondary adjustment process of the exhaust temperature is effectively simplified.
Specifically, the present invention achieves the objective of changing the target discharge temperature of the compressor by controlling the manner in which the opening degree of the throttling device on the inflow side of the flash tank is reduced. Here, when the air conditioner operates in different operation modes, the flow direction of the refrigerant in the first pipeline is also different, for example, in the air conditioning system structure shown in fig. 1, when the air conditioner operates in a cooling mode, the flow direction of the refrigerant in the first pipeline is from left to right, at this time, the side where the first throttling device is located is the inflow side of the flash tank, and the side where the second throttling device is located is the outflow side of the flash tank; when the air conditioner operates in a heating mode, the refrigerant flows in the first pipeline from right to left, at the moment, the side where the first throttling device is located is the outflow side of the flash tank, and the side where the second throttling device is located is the inflow side of the flash tank.
Therefore, when the air conditioner operates in a cooling mode, when the working condition is met, the opening degree of the first throttling device is controlled to be reduced; when the air conditioner operates in the heating mode, the opening degree of the second throttling device is controlled to be reduced.
Here, the refrigerant has its own temperature and pressure decreased after passing through the throttling device. Therefore, by reducing the opening degree of the throttling device on the inflow side of the flash evaporator, the temperature and pressure of the refrigerant flowing into the flash evaporator can be reduced, and the temperature and pressure of the refrigerant flowing back to the compressor can be further reduced, so that the actual exhaust temperature of the compressor can be adjusted to the target exhaust temperature by the above manner.
Alternatively, the opening degree of the throttling means at the inflow side of the flash tank may be gradually decreased to a certain opening degree value at a set rate, or the opening degree of the throttling means at the inflow side may be directly decreased to a set opening degree value or values until the actual discharge temperature of the compressor reaches the target discharge temperature.
Alternatively, when the throttling device at the inflow side of the flash tank is decreased at a set rate, the set rate may be predetermined according to a predetermined rule, for example, the rate has a predetermined proportional relationship with the temperature difference value, so that after the temperature difference value is determined, the set rate is obtained according to the predetermined proportional relationship, and the opening degree of the throttling device is decreased according to the rate, so that the discharge temperature of the compressor reaches the target discharge temperature.
Optionally, the step S203 of correcting the target exhaust temperature of the compressor may specifically include: and controlling to reduce the target exhaust temperature of the compressor to a corrected value by adjusting the operating parameters of the compressor, wherein the corrected exhaust temperature is the target exhaust temperature.
Here, the operating parameters of the compressor include, but are not limited to: the operating power, operating voltage or operating current of the compressor.
In this embodiment, the air conditioning system is pre-stored with a plurality of correction values arranged in a certain order, e.g., from large to small. Thus, the target exhaust temperature of the compressor can be sequentially reduced to each correction value, whether the condition that the temperature difference value between the outdoor environment temperature Tao and the cooling fin temperature Tx is smaller than the preset temperature difference threshold value after the correction operation and the adjustment operation is met or not is judged by adjusting the throttling device, and if the condition is met, the current correction value is used as the target exhaust temperature; if the temperature difference between the outdoor environment temperature Tao and the cooling fin temperature Tx is not satisfied, the exhaust temperature is corrected from the current corrected value to the next corrected value, and the adjusting operation of the throttling device is repeated until the condition that the temperature difference value between the outdoor environment temperature Tao and the cooling fin temperature Tx is smaller than the preset temperature difference threshold value is satisfied.
Preferably, the difference between the plurality of correction values arranged in sequence is in a decreasing rule, that is, the correction amplitude is gradually reduced at each correction, so that the problem of reverse correction caused by excessive correction can be avoided, and the overall execution times of the correction operation can be reduced.
Fig. 3 is a flowchart illustrating a control method of the air conditioning system according to the first embodiment of the present invention.
As shown in fig. 3, the main control flow of another control method provided by the present invention may include:
s301, the air conditioner operates in a refrigeration mode;
s302, acquiring outdoor environment temperature Tao;
s303, acquiring the temperature Tx of the radiating fin;
s304, calculating a temperature difference value delta t between the outdoor environment temperature Tao and the cooling fin temperature Tx;
s305, judging whether the temperature difference value delta T is not smaller than the temperature difference threshold delta T, if so, executing a step S306, and if not, executing a step S309;
s306, correcting the exhaust temperature of the compressor to a correction value Tn;
here, Tn includes sequentially arranged Ts1,……,Tn;
S307、n=n+1;
S308, reducing the opening degree of the first throttling device to K1, and returning to execute the step S302;
s309, reducing the opening k of the first throttling device;
s310, acquiring the current exhaust temperature of the compressor;
s311, judging whether the current exhaust temperature of the compressor reaches the target exhaust temperature, if so, executing a step S312, and if not, executing a step S309;
in this embodiment, the initial correction of the exhaust temperature in step S306 is based on the initial target exhaust temperature, and the correction value satisfying step S305 is taken as the new target exhaust temperature, so in step S311, the new target exhaust temperature is corrected to the initial target exhaust temperature again, so that the final exhaust temperature of the air conditioner satisfies the heat exchange requirement;
alternatively, the initial correction of the exhaust temperature in step S306 is based on the current exhaust temperature detected at the start of the present process, and the correction value satisfying step S305 is set as the new target exhaust temperature, so that the new target exhaust temperature is corrected again to the initially set target exhaust temperature in step S311 so that the final exhaust temperature of the air conditioner satisfies the heat exchange requirement.
And S312, maintaining the current running state of the air conditioning system unchanged. The process is finished.
Optionally, in the adjusting process shown in the above embodiments of the present invention, the third throttling device on the cooling branch is in a closed state, at this time, the cooling branch is blocked, no or only a small amount of refrigerant flows through, and at this time, heat exchange is mainly performed between the electrical control and the liquid storage tank, so that the adjusting process in the above embodiments mainly considers the operation when the heat exchange between the electrical control and the liquid storage tank affects the performance of the air conditioner.
Example 2
Fig. 4 is a first flowchart illustrating a control method of the air conditioning system according to the second embodiment of the present invention.
As shown in fig. 4, the present invention further provides another control method of an air conditioning system, and the main control flow of the control method may include:
s401, acquiring outdoor environment temperature Tao;
in this embodiment, the outdoor unit of the air conditioning system is configured with another temperature sensor, the temperature sensor can be used to detect a current temperature parameter of the outdoor environment, and the current temperature parameter detected by the temperature sensor disposed in the outdoor unit can be obtained in step S401 and is used as the outdoor environment temperature Tao.
Or, the air conditioning system of the present invention accesses the external network through the home lan, and may search the outdoor environment data corresponding to the coordinate position of the air conditioner from the server of the air conditioning product service provider or the network platform providing the weather data information, where the outdoor environment data includes the current temperature parameter of the outdoor environment, and thus, the current temperature parameter of the outdoor environment obtained by the search in step S401 may be used as the outdoor environment temperature Tao.
S402, acquiring the temperature Tx of the radiating fin;
in this embodiment, the outdoor unit of the air conditioning system is configured with another temperature sensor, the sensing end of the temperature sensor is disposed on the heat sink of the heat sink, and is configured to detect a current temperature parameter of the heat sink, and the current temperature parameter detected by the temperature sensor can be obtained in step S402 and is used as the temperature Tx of the heat sink.
In some embodiments, the heat sink temperature Tx may reflect the real-time temperature of the electrical control to some extent, because the heat sink temperature Tx may exchange heat with the electrical control, and finally reach the same or similar temperature, and in other embodiments, the heat sink temperature Tx may also be replaced by the real-time temperature data of the electrical control collected by the temperature sensor.
And S403, if the temperature difference value between the outdoor environment temperature Tao and the cooling fin temperature Tx is not smaller than the preset temperature difference threshold value, controlling and adjusting the opening of the throttling device until the temperature difference value between the outdoor environment temperature Tao and the cooling fin temperature Tx is smaller than the preset temperature difference threshold value when the compressor runs at the target exhaust temperature.
Here, the air conditioning system is pre-stored with one or more temperature difference thresholds, which may be used to characterize a temperature threshold that may place the electrical control in a safe operating state, or may trigger a high temperature shutdown protection of the air conditioner. That is, under the temperature condition that the temperature difference value between the outdoor environment temperature Tao and the cooling fin temperature Tx is not less than the preset temperature difference threshold, the electric control part is in an unsafe working state that is easy to damage and burn or may cause the air conditioning system to trigger a high-temperature shutdown protection mode, and at this time, the whole air conditioning system is in abnormal operation, which may have adverse effects on the operation performance of the air conditioning system; and under the temperature condition that the temperature difference value between the outdoor environment temperature Tao and the cooling fin temperature Tx is smaller than the preset temperature difference threshold value, the electric control part is in a safe working state or the air conditioning system cannot trigger a high-temperature shutdown protection mode, at the moment, the whole air conditioning system is in normal operation, and the influence of the external temperature on the operation performance of the air conditioning system is small.
Therefore, under the temperature condition that the temperature difference value between the outdoor environment temperature Tao and the cooling fin temperature Tx is not less than the preset temperature difference threshold value, namely the electric control part is easy to damage and trigger high-temperature protection, the current operation state of the air conditioning system is changed in a mode of adjusting the opening of the throttling device, so that when the compressor operates at the corrected exhaust temperature, the temperature difference value between the outdoor environment temperature Tao and the cooling fin temperature Tx is less than the preset temperature difference threshold value, the temperature protection requirement of the electric control part and the performance requirement of the air conditioning system on the exhaust temperature of the compressor can be met simultaneously, and the whole safe and effective operation of the air conditioning system is effectively guaranteed.
Optionally, if the temperature difference between the outdoor ambient temperature Tao and the cooling fin temperature Tx is smaller than a preset temperature difference threshold, and at this time, the air conditioner is in a normal operation state, the current exhaust temperature of the compressor may be adjusted to a target exhaust temperature, so that the temperature requirement of the air conditioner for heat exchange of a refrigerant is met; therefore, the control method further includes: the control reduces the opening of the throttling device on the inflow side of the flash tank until the target discharge temperature of the compressor is reached.
Here, the air conditioning system is provided with a program such as an operation algorithm of a target exhaust temperature, and the target exhaust temperature of the compressor suitable for the current working condition can be automatically calculated by obtaining one or more parameters set by a user, for example, the air conditioning system is provided with a temperature mapping table, which can be used for representing a mapping relation between a user-set temperature and the exhaust temperature of the compressor, and setting parameters corresponding to each exhaust temperature, for example, when the user-set temperature is 23 ℃, the exhaust temperature of the compressor mapped by the mapping table is 70 ℃; the user sets a temperature of 26 c, which maps to a compressor discharge temperature of 65 c, and so on. After the set temperature of the user is determined, the exhaust temperature of the compressor and the corresponding set parameters can be determined according to the mapping table, and the operation of relevant parts of the air conditioning system is adjusted, so that the actual exhaust temperature of the compressor reaches the exhaust temperature. Here, the exhaust gas temperature is the aforementioned target exhaust gas temperature.
Here, the user-set temperature is a desired temperature parameter input to the air conditioning system by the user through a remote controller or a control panel.
Or determining the target exhaust temperature according to the outdoor environment temperature Tao and a preset rule, wherein the preset rule is used for representing the incidence relation between the outdoor environment temperature Tao and the target exhaust temperature.
It should be understood that the determination manner of the target exhaust temperature is not limited to the mapping table, and the target exhaust temperature may be determined by calculation through a mapping relationship of other parameters or other algorithms, which is not limited to this invention.
In this embodiment, after the air conditioner is turned on, the discharge temperature of the compressor is first adjusted to the target discharge temperature according to the above-mentioned setting parameters, and then the temperature of the electric control unit changes with the continuous operation of the air conditioner and the continuous change of the outdoor temperature, so the temperature difference between the outdoor ambient temperature Tao and the temperature Tx of the heat sink changes continuously, which makes the temperature of the refrigerant flowing back to the compressor not unique, therefore, after the compressor of the air conditioning system operates for a period of time, although the compressor still operates with the setting parameters, the actual discharge temperature often does not conform to the target discharge temperature, and the readjustment of the setting parameters is more variable, the process is complex, and most air conditioning systems do not set the related secondary calculation algorithm, therefore, on the premise that the setting parameters of the air conditioning system are not reset, the temperature of the refrigerant flowing back to the compressor is changed by adjusting the opening degree of one or more throttling devices, so that the actual exhaust temperature of the adjusted compressor can be consistent with the target exhaust temperature, the heat exchange requirement of the air conditioner is met, and the secondary adjustment process of the exhaust temperature is effectively simplified.
Specifically, the present invention achieves the objective of changing the target discharge temperature of the compressor by controlling the manner in which the opening degree of the throttling device on the inflow side of the flash tank is reduced. Here, when the air conditioner operates in different operation modes, the flow direction of the refrigerant in the first pipeline is also different, for example, in the air conditioning system structure shown in fig. 1, when the air conditioner operates in a cooling mode, the flow direction of the refrigerant in the first pipeline is from left to right, at this time, the side where the first throttling device is located is the inflow side of the flash tank, and the side where the second throttling device is located is the outflow side of the flash tank; when the air conditioner operates in a heating mode, the refrigerant flows in the first pipeline from right to left, at the moment, the side where the first throttling device is located is the outflow side of the flash tank, and the side where the second throttling device is located is the inflow side of the flash tank.
Therefore, when the air conditioner operates in a cooling mode, when the working condition is met, the opening degree of the first throttling device is controlled to be reduced; when the air conditioner operates in the heating mode, the opening degree of the second throttling device is controlled to be reduced.
Here, the refrigerant has its own temperature and pressure decreased after passing through the throttling device. Therefore, by reducing the opening degree of the throttling device on the inflow side of the flash evaporator, the temperature and pressure of the refrigerant flowing into the flash evaporator can be reduced, and the temperature and pressure of the refrigerant flowing back to the compressor can be further reduced, so that the actual exhaust temperature of the compressor can be adjusted to the target exhaust temperature by the above manner.
Alternatively, the opening degree of the throttling means at the inflow side of the flash tank may be gradually decreased to a certain opening degree value at a set rate, or the opening degree of the throttling means at the inflow side may be directly decreased to a set opening degree value or values until the actual discharge temperature of the compressor reaches the target discharge temperature.
Alternatively, when the throttling device at the inflow side of the flash tank is decreased at a set rate, the set rate may be predetermined according to a predetermined rule, for example, the rate has a predetermined proportional relationship with the temperature difference value, so that after the temperature difference value is determined, the set rate is obtained according to the predetermined proportional relationship, and the opening degree of the throttling device is decreased according to the rate, so that the discharge temperature of the compressor reaches the target discharge temperature.
In an alternative embodiment, the controlling of the opening degree of the throttle device in step S403 includes: and controlling and adjusting the opening degree of a third throttling device of the cooling branch. The opening degree of the third throttling device of the cooling branch is adjusted, so that the temperature, the pressure and other parameters of the refrigerant flowing through the cooling branch can be adjusted, the refrigerant flowing through the cooling branch is utilized to carry out auxiliary cooling on the electric control part, and the electric control part can be at a safe working temperature; and the temperature and pressure of the refrigerant flowing back to the compressor can be further adjusted, so that the actual exhaust temperature of the compressor can be adjusted to the target exhaust temperature by the above mode.
Preferably, the controlling of the opening degree of the third throttling means adjusting the cooling branch includes: the third throttling means is controlled to turn on at a set pulse rate. Therefore, the parameters such as the temperature, the pressure and the like of the refrigerant can be changed more stably, and the adverse effect of the sudden change of the refrigerant parameters on the air conditioning system is avoided.
Fig. 5 is a flowchart illustrating a control method of the air conditioning system according to the second embodiment of the present invention.
As shown in fig. 5, the main control flow of another control method provided by the present invention may include:
s501, the air conditioner runs in a refrigeration mode;
s502, acquiring outdoor environment temperature Tao;
s503, acquiring the temperature Tx of the radiating fin;
s504, calculating a temperature difference value delta t between the outdoor environment temperature Tao and the radiating fin temperature Tx;
s505, judging whether the temperature difference value delta T is not less than the temperature difference threshold delta T, if so, executing a step S506, and if not, executing a step S507;
s506, adjusting the opening degree of the third throttling device, and returning to execute the step S502;
in this embodiment, the manner of adjusting the opening degree of the third throttling device is as follows: opening and gradually increasing the opening degree of the third throttling device at a set pulse rate v/s;
s507, reducing the opening k of the first throttling device;
s508, acquiring the current exhaust temperature of the compressor;
s509, judging whether the current exhaust temperature of the compressor reaches the target exhaust temperature, if so, executing the step S509, and if not, executing the step S510;
and S510, maintaining the current running state of the air conditioning system unchanged. The process is finished.
Optionally, in the adjusting process shown in the above embodiment of the present invention, the third throttling device on the cooling branch is initially in a closed state, the cooling branch is blocked, no or only a small amount of refrigerant flows through the cooling branch, and at this time, heat exchange is mainly performed between the electrical control and the liquid storage tank; when the temperature difference judgment condition is met, starting a heat dissipation device on the cooling branch to perform auxiliary cooling operation on the electric control element so as to reduce the temperature of the electric control element to a safe temperature range; and then, adjusting the exhaust temperature of the compressor of the air conditioning system to the target exhaust temperature by adjusting other throttling devices, so that the exhaust temperature meets the heat exchange performance requirement expected by a user.
Example 3
Fig. 6 is a first flowchart illustrating a control method of the air conditioning system according to the third embodiment of the present invention.
As shown in fig. 6, the present invention further provides another control method of an air conditioning system, and the main control flow of the control method may include:
s601, acquiring outdoor environment temperature Tao;
in this embodiment, the outdoor unit of the air conditioning system is configured with another temperature sensor, and the temperature sensor can be used to detect a current temperature parameter of the outdoor environment, and the current temperature parameter detected by the temperature sensor disposed in the outdoor unit can be obtained in step S601 and taken as the outdoor environment temperature Tao.
Or, the air conditioning system of the present invention accesses the external network through the home lan, and may search the outdoor environment data corresponding to the coordinate position of the air conditioner from the server of the air conditioning product service provider or the network platform providing the weather data information, where the outdoor environment data includes the current temperature parameter of the outdoor environment, and thus, the current temperature parameter of the outdoor environment obtained by the search in step S601 may be used as the outdoor environment temperature Tao.
S602, acquiring the temperature Tx of the cooling fin;
in this embodiment, the outdoor unit of the air conditioning system is configured with another temperature sensor, the sensing end of the temperature sensor is disposed on the heat sink of the heat sink, and is configured to detect a current temperature parameter of the heat sink, and the current temperature parameter detected by the temperature sensor can be obtained in step S602 and is used as the heat sink temperature Tx.
In some embodiments, the heat sink temperature Tx may reflect the real-time temperature of the electrical control to some extent, because the heat sink temperature Tx may exchange heat with the electrical control, and finally reach the same or similar temperature, and in other embodiments, the heat sink temperature Tx may also be replaced by the real-time temperature data of the electrical control collected by the temperature sensor.
And S603, if the temperature difference value between the outdoor environment temperature Tao and the radiating fin temperature Tx is not smaller than the preset temperature difference threshold, correcting the target superheat degree of the air-conditioning system, and controlling and adjusting the opening degree of the throttling device until the air-conditioning system runs at the corrected superheat degree, wherein the temperature difference value between the outdoor environment temperature Tao and the radiating fin temperature Tx is smaller than the preset temperature difference threshold.
In an alternative embodiment, the superheat of the air conditioning system during initial operation may indirectly affect the heat sink temperature Tx. The air conditioner determines an initial, uncorrected superheat degree from a mapping table, where the mapping table includes operating frequency values or range values for a plurality of compressors, each operating frequency value or range value corresponding to a superheat degree value. Therefore, when the air conditioning system is started to operate, the initial operating frequency of the compressor can be determined according to the set parameters of the air conditioner, and then the initial uncorrected superheat degree can be further determined according to the mapping relation table; therefore, the correction of the target superheat of the air conditioning system in step S603 is the correction operation for the initial uncorrected superheat.
Alternatively, in another embodiment, after the air conditioning system is started to operate, the superheat degree may be determined by: detecting the suction temperature of a compressor and the temperature of an inner coil of an air conditioning system; and calculating the difference between the suction temperature and the temperature of the inner coil to obtain the superheat degree.
The air suction port of the compressor is provided with a temperature sensor which can be used for monitoring the air suction temperature of the compressor in real time; meanwhile, the inner coil of the indoor unit of the air conditioning system is also provided with a temperature sensor which can be used for monitoring the temperature of the inner coil in real time; therefore, the suction temperature of the compressor and the temperature of the inner coil of the air conditioning system can be obtained through the two temperature sensors, and further, the superheat degree can be obtained through calculating the difference value between the suction temperature and the temperature of the inner coil.
Here, the air conditioning system is pre-stored with one or more temperature difference thresholds, which may be used to characterize a temperature threshold that may place the electrical control in a safe operating state, or may trigger a high temperature shutdown protection of the air conditioner. That is, under the temperature condition that the temperature difference value between the outdoor environment temperature Tao and the cooling fin temperature Tx is not less than the preset temperature difference threshold, the electric control part is in an unsafe working state that is easy to damage and burn or may cause the air conditioning system to trigger a high-temperature shutdown protection mode, and at this time, the whole air conditioning system is in abnormal operation, which may have adverse effects on the operation performance of the air conditioning system; and under the temperature condition that the temperature difference value between the outdoor environment temperature Tao and the cooling fin temperature Tx is smaller than the preset temperature difference threshold value, the electric control part is in a safe working state or the air conditioning system cannot trigger a high-temperature shutdown protection mode, at the moment, the whole air conditioning system is in normal operation, and the influence of the external temperature on the operation performance of the air conditioning system is small.
Therefore, under the temperature condition that the temperature difference value between the outdoor environment temperature Tao and the radiating fin temperature Tx is not less than the preset temperature difference threshold value, the electric control part is easy to damage and trigger high-temperature protection, the current running state of the air conditioning system is changed in a mode of correcting the superheat degree and adjusting the opening of the throttling device, so that when the air conditioning system runs at the corrected superheat degree, the temperature difference value between the outdoor environment temperature Tao and the radiating fin temperature Tx is less than the preset temperature difference threshold value, the temperature protection requirement of the electric control part and the performance requirement of the air conditioning system on the superheat degree can be met simultaneously, and the whole safe and effective running of the air conditioning system is effectively guaranteed.
Optionally, if the temperature difference between the outdoor ambient temperature Tao and the cooling fin temperature Tx is smaller than a preset temperature difference threshold, and at this time, the air conditioner is in a normal operation state, the current exhaust temperature of the compressor may be adjusted to a target exhaust temperature, so that the temperature requirement of the air conditioner for heat exchange of a refrigerant is met; therefore, the control method further includes: and maintaining the current running state unchanged.
In an alternative embodiment, controlling the opening of the throttle device comprises: the opening of the throttling device on the inflow side of the flash tank is controlled to be reduced.
Specifically, the present invention achieves the objective of changing the target discharge temperature of the compressor by controlling the manner in which the opening degree of the throttling device on the inflow side of the flash tank is reduced. Here, when the air conditioner operates in different operation modes, the flow direction of the refrigerant in the first pipeline is also different, for example, in the air conditioning system structure shown in fig. 1, when the air conditioner operates in a cooling mode, the flow direction of the refrigerant in the first pipeline is from left to right, at this time, the side where the first throttling device is located is the inflow side of the flash tank, and the side where the second throttling device is located is the outflow side of the flash tank; when the air conditioner operates in a heating mode, the refrigerant flows in the first pipeline from right to left, at the moment, the side where the first throttling device is located is the outflow side of the flash tank, and the side where the second throttling device is located is the inflow side of the flash tank.
Therefore, when the air conditioner operates in a cooling mode, when the working condition is met, the opening degree of the first throttling device is controlled to be reduced; when the air conditioner operates in the heating mode, the opening degree of the second throttling device is controlled to be reduced.
Here, the refrigerant has its own temperature and pressure decreased after passing through the throttling device. Therefore, by reducing the opening degree of the throttling device on the inflow side of the flash evaporator, the temperature and pressure of the refrigerant flowing into the flash evaporator can be reduced, and the temperature and pressure of the refrigerant flowing back to the liquid storage tank can be further reduced.
Alternatively, the opening degree of the throttling device at the inflow side of the flash tank may be gradually reduced to a certain opening degree value at a set rate, or the opening degree of the throttling device at the inflow side may be directly reduced to one or more set opening degree values until the actual superheat degree of the air conditioning system reaches the target superheat degree obtained after correction.
Optionally, when the throttling device at the inflow side of the flash tank is decreased at a set rate, the set rate may be predetermined according to a preset rule, for example, the rate and the temperature difference value have a certain preset proportional relationship, so that after the temperature difference value is determined, the set rate may be obtained according to the preset proportional relationship, and the opening degree of the throttling device is decreased according to the rate, so that the superheat degree of the air conditioning system reaches the target exhaust temperature obtained after correction.
In an alternative embodiment, modifying the target superheat of the air conditioning system comprises: and controlling to reduce the target superheat degree to a corrected value by adjusting the operating parameters of the compressor, wherein the corrected value is the corrected superheat degree.
Here, the operating parameters of the compressor include, but are not limited to: the operating power, operating voltage or operating current of the compressor.
In this embodiment, the air conditioning system is pre-stored with a plurality of correction values arranged in a certain order, e.g., from large to small. Therefore, the superheat degree of the air conditioning system can be sequentially reduced to each correction value, whether the condition that the temperature difference value between the outdoor environment temperature Tao and the cooling fin temperature Tx is smaller than a preset temperature difference threshold value after the correction operation and the adjustment operation is met or not is judged by adjusting the throttling device, and if the condition is met, the current correction value is used as the target superheat degree; if the superheat degree is not satisfied, correcting the superheat degree from the current corrected value to the next corrected value, and repeating the adjustment operation of the throttling device until the condition that the temperature difference value between the outdoor environment temperature Tao and the cooling fin temperature Tx is less than the preset temperature difference threshold is satisfied.
Preferably, the difference between the plurality of correction values arranged in sequence is in a decreasing rule, that is, the correction amplitude is gradually reduced at each correction, so that the problem of reverse correction caused by excessive correction can be avoided, and the overall execution times of the correction operation can be reduced.
Fig. 7 is a flowchart illustrating a control method of the air conditioning system according to the second embodiment (a).
As shown in fig. 7, the main control flow of another control method provided by the present invention may include:
s701, the air conditioner operates in a refrigeration mode;
s702, acquiring outdoor environment temperature Tao;
s703, acquiring the temperature Tx of the radiating fin;
s704, calculating a temperature difference value delta t between the outdoor environment temperature Tao and the radiating fin temperature Tx;
s705, judging whether the temperature difference value delta T is not smaller than the temperature difference threshold value delta T, if so, executing a step S706, and if not, executing a step S709;
s706, correcting the superheat degree of the air conditioning system to a correction value SHn;
here, SHn includes SH arranged in order1,……,SHn;
S707、n=n+1;
S708, reducing the opening degree of the first throttling device to K1, and returning to execute the step S702;
and S709, maintaining the current running state of the air conditioning system unchanged. The process is finished.
Optionally, in the adjusting process shown in the above embodiments of the present invention, the third throttling device on the cooling branch is in a closed state, at this time, the cooling branch is blocked, no or only a small amount of refrigerant flows through, and at this time, heat exchange is mainly performed between the electrical control and the liquid storage tank, so that the adjusting process in the above embodiments mainly considers the operation when the heat exchange between the electrical control and the liquid storage tank affects the performance of the air conditioner.
Example (IV)
Fig. 8 is a first flowchart illustrating a control method of the air conditioning system according to the present invention in the fourth embodiment (a).
As shown in fig. 8, the present invention further provides another control method of an air conditioning system, and the main control flow of the control method may include:
s801, acquiring outdoor environment temperature Tao;
in this embodiment, the outdoor unit of the air conditioning system is configured with another temperature sensor, the temperature sensor can be used to detect the current temperature parameter of the outdoor environment, and the current temperature parameter detected by the temperature sensor disposed in the outdoor unit can be obtained in step S801 and taken as the outdoor environment temperature Tao.
Or, the air conditioning system of the present invention accesses the external network through the home lan, and may search the outdoor environment data corresponding to the coordinate position of the air conditioner from the server of the air conditioning product service provider or the network platform providing the weather data information, where the outdoor environment data includes the current temperature parameter of the outdoor environment, and thus, the current temperature parameter of the outdoor environment obtained by the search in step S801 may be used as the outdoor environment temperature Tao.
S802, obtaining the temperature Tx of the radiating fin;
in this embodiment, the outdoor unit of the air conditioning system is configured with another temperature sensor, the sensing end of the temperature sensor is disposed on the heat sink of the heat sink, and is configured to detect a current temperature parameter of the heat sink, and the current temperature parameter detected by the temperature sensor can be obtained in step S802 and is used as the temperature Tx of the heat sink.
In some embodiments, the heat sink temperature Tx may reflect the real-time temperature of the electrical control to some extent, because the heat sink temperature Tx may exchange heat with the electrical control, and finally reach the same or similar temperature, and in other embodiments, the heat sink temperature Tx may also be replaced by the real-time temperature data of the electrical control collected by the temperature sensor.
And S803, if the temperature difference value between the outdoor environment temperature Tao and the cooling fin temperature Tx is not less than the preset temperature difference threshold value, controlling and adjusting the opening degree of the throttling device until the temperature difference value between the outdoor environment temperature Tao and the cooling fin temperature Tx is less than the preset temperature difference threshold value when the compressor runs at the target superheat degree.
In an alternative embodiment, the superheat of the air conditioning system during initial operation may indirectly affect the heat sink temperature Tx. The air conditioner determines an initial superheat degree through a mapping table, wherein the mapping table comprises a plurality of operating frequency values or range values of the compressors, and each operating frequency value or range value corresponds to a superheat degree value. Therefore, when the air conditioning system is started, the initial operation frequency of the compressor can be determined according to the set parameters of the air conditioner, and then the initial superheat degree can be further determined according to the mapping relation table.
Alternatively, in another embodiment, after the air conditioning system is started to operate, the superheat degree may be determined by: detecting the suction temperature of a compressor and the temperature of an inner coil of an air conditioning system; and calculating the difference between the suction temperature and the temperature of the inner coil to obtain the superheat degree.
The air suction port of the compressor is provided with a temperature sensor which can be used for monitoring the air suction temperature of the compressor in real time; meanwhile, the inner coil of the indoor unit of the air conditioning system is also provided with a temperature sensor which can be used for monitoring the temperature of the inner coil in real time; therefore, the suction temperature of the compressor and the temperature of the inner coil of the air conditioning system can be obtained through the two temperature sensors, and further, the superheat degree can be obtained through calculating the difference value between the suction temperature and the temperature of the inner coil.
Here, the air conditioning system is pre-stored with one or more temperature difference thresholds, which may be used to characterize a temperature threshold that may place the electrical control in a safe operating state, or may trigger a high temperature shutdown protection of the air conditioner. That is, under the temperature condition that the temperature difference value between the outdoor environment temperature Tao and the cooling fin temperature Tx is not less than the preset temperature difference threshold, the electric control part is in an unsafe working state that is easy to damage and burn or may cause the air conditioning system to trigger a high-temperature shutdown protection mode, and at this time, the whole air conditioning system is in abnormal operation, which may have adverse effects on the operation performance of the air conditioning system; and under the temperature condition that the temperature difference value between the outdoor environment temperature Tao and the cooling fin temperature Tx is smaller than the preset temperature difference threshold value, the electric control part is in a safe working state or the air conditioning system cannot trigger a high-temperature shutdown protection mode, at the moment, the whole air conditioning system is in normal operation, and the influence of the external temperature on the operation performance of the air conditioning system is small.
Therefore, under the temperature condition that the temperature difference value between the outdoor environment temperature Tao and the radiating fin temperature Tx is not less than the preset temperature difference threshold value, the electric control part is easy to damage and trigger high-temperature protection, the current operation state of the air conditioning system is changed in a mode of adjusting the opening degree of the throttling device, so that when the air conditioning system operates at the target superheat degree, the temperature difference value between the outdoor environment temperature Tao and the radiating fin temperature Tx is less than the preset temperature difference threshold value, the temperature protection requirement of the electric control part and the performance requirement of the air conditioning system on the superheat degree can be met simultaneously, and the whole safe and effective operation of the air conditioning system is effectively guaranteed.
Optionally, if the temperature difference between the outdoor ambient temperature Tao and the cooling fin temperature Tx is smaller than a preset temperature difference threshold, and at this time, the air conditioner is in a normal operation state, the current exhaust temperature of the compressor may be adjusted to a target exhaust temperature, so that the temperature requirement of the air conditioner for heat exchange of a refrigerant is met; therefore, the control method further includes: and maintaining the current running state unchanged.
In an alternative embodiment, the step S803 of controlling and adjusting the opening degree of the throttling device includes: and controlling and adjusting the opening degree of a third throttling device of the cooling branch. The opening degree of the third throttling device of the cooling branch is adjusted, so that the temperature, the pressure and other parameters of the refrigerant flowing through the cooling branch can be adjusted, the refrigerant flowing through the cooling branch is utilized to carry out auxiliary cooling on the electric control part, and the electric control part can be at a safe working temperature; and the temperature and pressure of the refrigerant flowing back to the compressor can be further adjusted, so that the actual superheat degree of the air conditioner can be adjusted to the target exhaust temperature by the above mode.
Preferably, the controlling of the opening degree of the third throttling means adjusting the cooling branch includes: the third throttling means is controlled to turn on at a set pulse rate. Therefore, the parameters such as the temperature, the pressure and the like of the refrigerant can be changed more stably, and the adverse effect of the sudden change of the refrigerant parameters on the air conditioning system is avoided.
Fig. 9 is a flowchart illustrating a control method of the air conditioning system according to the second embodiment (a).
As shown in fig. 9, the main control flow of another control method provided by the present invention may include:
s901, operating an air conditioner in a refrigeration mode;
s902, acquiring outdoor environment temperature Tao;
s903, acquiring the temperature Tx of the radiating fin;
s904, calculating the temperature difference value delta t of the outdoor environment temperature Tao and the radiating fin temperature Tx;
s905, judging whether the temperature difference value delta T is not smaller than the temperature difference threshold value delta T, if so, executing a step S906, and if not, executing a step S907;
s906, adjusting the opening degree of the third throttling device, and returning to execute the step S902;
in this embodiment, the manner of adjusting the opening degree of the third throttling device is as follows: opening and gradually increasing the opening degree of the third throttling device at a set pulse rate v/s;
and S907, maintaining the current running state of the air conditioning system unchanged. The process is finished.
Optionally, in the adjusting process shown in the above embodiment of the present invention, the third throttling device on the cooling branch is initially in a closed state, the cooling branch is blocked, no or only a small amount of refrigerant flows through the cooling branch, and at this time, heat exchange is mainly performed between the electrical control and the liquid storage tank; when the temperature difference judgment condition is met, starting a heat dissipation device on the cooling branch to perform auxiliary cooling operation on the electric control element so as to reduce the temperature of the electric control element to a safe temperature range; and then, adjusting the superheat degree of the air conditioning system to a target superheat degree by adjusting other throttling devices, so that the target superheat degree meets the heat exchange performance requirement expected by a user.
Example (five)
Fig. 10 is a first flowchart illustrating a control method of the air conditioning system according to the present invention in the fifth embodiment.
As shown in fig. 10, the present invention further provides another control method of an air conditioning system, and the main control flow of the control method may include:
s1001, acquiring outdoor environment temperature Tao;
in this embodiment, the outdoor unit of the air conditioning system is configured with another temperature sensor, the temperature sensor can be used to detect a current temperature parameter of the outdoor environment, and the current temperature parameter detected by the temperature sensor disposed in the outdoor unit can be obtained in step S1001 and is used as the outdoor environment temperature Tao.
Or, the air conditioning system of the present invention accesses the external network through the home lan, and may search the outdoor environment data corresponding to the coordinate position of the air conditioner from the server of the air conditioning product service provider or the network platform providing the weather data information, where the outdoor environment data includes the current temperature parameter of the outdoor environment, and thus, the current temperature parameter of the outdoor environment obtained by the search in step S1001 may be used as the outdoor environment temperature Tao.
S1002, acquiring the temperature Tx of the radiating fin;
in this embodiment, the outdoor unit of the air conditioning system is configured with another temperature sensor, the sensing end of the temperature sensor is disposed on the heat sink of the heat sink, and the temperature sensor can be used to detect the current temperature parameter of the heat sink, and the current temperature parameter detected by the temperature sensor can be obtained in step S1002 and used as the temperature Tx of the heat sink.
In some embodiments, the heat sink temperature Tx may reflect the real-time temperature of the electrical control to some extent, because the heat sink temperature Tx may exchange heat with the electrical control, and finally reach the same or similar temperature, and in other embodiments, the heat sink temperature Tx may also be replaced by the real-time temperature data of the electrical control collected by the temperature sensor.
S1003, if the temperature difference value between the outdoor environment temperature Tao and the radiating fin temperature Tx is not smaller than the preset temperature difference threshold value, determining an adjusting rate according to the temperature difference value, and controlling and adjusting the third throttling device according to the determined adjusting rate until the temperature difference value between the outdoor environment temperature Tao and the radiating fin temperature Tx is smaller than the preset temperature difference threshold value.
Here, the air conditioning system is pre-stored with one or more temperature difference thresholds, which may be used to characterize a temperature threshold that may place the electrical control in a safe operating state, or may trigger a high temperature shutdown protection of the air conditioner. That is, under the temperature condition that the temperature difference value between the outdoor environment temperature Tao and the cooling fin temperature Tx is not less than the preset temperature difference threshold, the electric control part is in an unsafe working state that is easy to damage and burn or may cause the air conditioning system to trigger a high-temperature shutdown protection mode, and at this time, the whole air conditioning system is in abnormal operation, which may have adverse effects on the operation performance of the air conditioning system; and under the temperature condition that the temperature difference value between the outdoor environment temperature Tao and the cooling fin temperature Tx is smaller than the preset temperature difference threshold value, the electric control part is in a safe working state or the air conditioning system cannot trigger a high-temperature shutdown protection mode, at the moment, the whole air conditioning system is in normal operation, and the influence of the external temperature on the operation performance of the air conditioning system is small.
Therefore, under the temperature condition that the temperature difference value between the outdoor environment temperature Tao and the radiating fin temperature Tx is not less than the preset temperature difference threshold value, the electric control part is easy to damage and trigger high-temperature protection, the current operation state of the air-conditioning system is changed in a mode of adjusting the opening degree of the throttling device, and the temperature difference value between the outdoor environment temperature Tao and the radiating fin temperature Tx can be less than the preset temperature difference threshold value, so that the temperature protection requirement of the electric control part and the performance requirement of the air-conditioning system can be met simultaneously, and the whole safe and effective operation of the air-conditioning system is effectively guaranteed.
Optionally, the determining the adjustment rate according to the temperature difference value in step S1003 may specifically include:
the regulation rate is calculated according to the following formula:
wherein v is the adjustment rate and Δ t is the temperature difference value.
For example, when Δ t is 5 ℃, the adjustment rate is 15.7 pulses/s by substituting the above calculation formula.
Thus, under the condition of meeting the temperature difference judgment condition, the third throttling device on the cooling branch is started and the valve degree of the third throttling device is improved at the regulation rate of 15.7 pulses/s; meanwhile, the outdoor environment temperature Tao and the cooling fin temperature Tx are repeatedly obtained for many times in the valve adjusting process until the temperature difference between the outdoor environment temperature Tao and the cooling fin temperature Tx is smaller than a preset temperature difference threshold value, and the third throttling device is maintained to be unchanged at the current valve opening.
Optionally, if the temperature difference between the outdoor ambient temperature Tao and the cooling fin temperature Tx is smaller than a preset temperature difference threshold, and at this time, the air conditioner is in a normal operation state, the current exhaust temperature of the compressor may be adjusted to a target exhaust temperature, so that the temperature requirement of the air conditioner for heat exchange of a refrigerant is met; therefore, the control method further includes: and maintaining the current running state unchanged.
Optionally, when the temperature difference between the external environment temperature Tao and the cooling fin temperature Tx is smaller than the preset temperature difference threshold, the control method further includes: the opening of the throttling device controlling the inflow side of the flash tank is adjusted until the compressor reaches the target discharge temperature.
Or, when the temperature difference value between the external environment temperature Tao and the cooling fin temperature Tx is smaller than the preset temperature difference threshold, the control method further includes: and adjusting the opening degree of a throttling device controlling the inflow side of the flash tank until the air conditioning system reaches the target superheat degree.
Specifically, the present invention achieves the object of changing the target discharge temperature of the compressor or the target superheat degree of the air conditioning system by controlling the manner of reducing the opening degree of the throttle device on the inflow side of the flash tank. Here, when the air conditioner operates in different operation modes, the flow direction of the refrigerant in the first pipeline is also different, for example, in the air conditioning system structure shown in fig. 1, when the air conditioner operates in a cooling mode, the flow direction of the refrigerant in the first pipeline is from left to right, at this time, the side where the first throttling device is located is the inflow side of the flash tank, and the side where the second throttling device is located is the outflow side of the flash tank; when the air conditioner operates in a heating mode, the refrigerant flows in the first pipeline from right to left, at the moment, the side where the first throttling device is located is the outflow side of the flash tank, and the side where the second throttling device is located is the inflow side of the flash tank.
Therefore, when the air conditioner operates in a cooling mode, when the working condition is met, the opening degree of the first throttling device is controlled to be reduced; when the air conditioner operates in the heating mode, the opening degree of the second throttling device is controlled to be reduced.
Here, the refrigerant has its own temperature and pressure decreased after passing through the throttling device. Therefore, by reducing the opening degree of the throttling device on the inflow side of the flash evaporator, the temperature and pressure of the refrigerant flowing into the flash evaporator can be reduced, and the temperature and pressure of the refrigerant flowing back to the compressor can be further reduced, so that the actual exhaust temperature of the compressor can be adjusted to the target exhaust temperature or the actual superheat degree of the air conditioning system can reach the target superheat degree.
Alternatively, the opening degree of the throttling device on the inflow side of the flash tank may be gradually reduced to a certain opening degree value at a set rate, or the opening degree of the throttling device on the inflow side is directly reduced to one or more set opening degree values until the actual discharge temperature of the compressor reaches the target discharge temperature, or the actual superheat degree of the air conditioning system reaches the target superheat.
Alternatively, when the throttling device at the inflow side of the flash tank is decreased at a set rate, the set rate may be predetermined according to a predetermined rule, for example, the rate and the temperature difference value have a predetermined proportional relationship, so that after the temperature difference value is determined, the set rate is obtained according to the predetermined proportional relationship, and the opening degree of the throttling device is decreased according to the rate, so that the discharge temperature of the compressor reaches the target discharge temperature, or the actual superheat degree of the air conditioning system reaches the target superheat degree.
Fig. 11 is a flowchart illustrating a control method of the air conditioning system according to the second embodiment (a fifth embodiment).
As shown in fig. 11, the main control flow of another control method provided by the present invention may include:
s1101, operating the air conditioner in a refrigeration mode;
s1102, acquiring an outdoor environment temperature Tao;
s1103, acquiring the temperature Tx of the radiating fin;
s1104, calculating a temperature difference value delta t between the outdoor environment temperature Tao and the cooling fin temperature Tx;
s1105, judging whether the temperature difference value delta T is not less than the temperature difference threshold value delta T, if yes, executing step S1106, and if not, executing step S1118;
s1106, calculating the regulation rate by the following formula:
s1107, starting a third throttling device, and increasing the valve opening of the third throttling device at an adjusting speed v for 3S; returning to execute the step S1102;
here, the above steps S1102 to S1105 are repeated every 3S after the third throttling means is turned on and the operation of increasing the valve degree is performed; during the first execution of the above cycle, the operation of opening the third throttling means is performed, during the cycles of other sequence than the first, only the operation of increasing the opening of the valve thereof at the regulation rate v and continuing for 3s is performed;
s1108, maintaining the current running state of the air conditioning system unchanged; the process is finished.
Example (six)
Fig. 12 is a first flowchart illustrating a control method of the air conditioning system according to the sixth embodiment of the present invention.
As shown in fig. 12, the present invention further provides another control method of an air conditioning system, and the main control flow of the control method may include:
s1201, acquiring outdoor temperature Tao;
in this embodiment, the outdoor unit of the air conditioning system is configured with another temperature sensor, and the temperature sensor can be used to detect a current temperature parameter of the outdoor environment, and the current temperature parameter detected by the temperature sensor disposed in the outdoor unit can be obtained in step S1201 and taken as the outdoor temperature Tao.
Or, the air conditioning system of the present invention accesses the external network through the home lan, and may search the outdoor environment data corresponding to the coordinate position of the air conditioner from the server of the air conditioning product service provider or the network platform providing the weather data information, where the outdoor environment data includes the current temperature parameter of the outdoor environment, and thus, the current temperature parameter of the outdoor environment obtained by the search in step S1201 may be used as the outdoor temperature Tao.
S1202, acquiring outdoor humidity RH;
in this embodiment, the outdoor unit of the air conditioning system is configured with another humidity sensor, the humidity sensor can be used to detect a current humidity parameter of the outdoor environment, and the current humidity parameter detected by the humidity sensor disposed in the outdoor unit can be obtained in step S1202 and is used as the outdoor humidity RH.
Or, the air conditioning system of the present invention accesses the external network through the home lan, and may search the outdoor environment data corresponding to the coordinate position of the air conditioner from the server of the air conditioning product service provider or the network platform providing the weather data information, where the outdoor environment data includes the current humidity parameter of the outdoor environment, and thus, the current humidity parameter of the outdoor environment obtained by the search in step S1202 may be used as the outdoor humidity RH.
S1203, determining the starting and stopping states and the opening degree of the third throttling device of the cooling branch according to the outdoor temperature Tao and the outdoor humidity RH.
Optionally, in step S1203, according to the outdoor temperature Tao and the outdoor humidity RH, determining the start-stop state of the third throttling device of the cooling branch and the degree of openness of the third throttling device, including:
when the outdoor temperature Tao is greater than or equal to the preset outdoor temperature threshold value, or
When the outdoor temperature Tao is less than the external temperature threshold and the outdoor humidity RH is less than the preset humidity threshold,
the third throttling means controlling the cooling branch remains off.
Under the temperature and humidity conditions in the above embodiments, the outdoor temperature is high, or the outdoor temperature is low and the outdoor humidity is low, at this time, the outdoor unit of the air conditioner is not prone to frosting, and therefore, the heating performance of the air conditioner can be met only by performing heat exchange between the electric control unit and the refrigerant in the liquid reservoir, so that the third throttling device of the cooling branch is controlled to be kept in a shutdown state, the refrigerant flow rate of the cooling branch to the refrigerant circulation pipeline is reduced, so that most of high-temperature refrigerants can be supplied to the heat exchanger of the indoor unit, and the heating effect of the air conditioning system to the indoor environment is ensured.
Optionally, according to outdoor temperature Tao and outdoor humidity RH, determine the start-stop state of the third throttling gear of the cooling branch and the degree of valve when opening, further include: and when the outdoor humidity RH is greater than a preset humidity threshold value, controlling a third throttling device of the cooling branch circuit to be in an open state.
Under the humiture condition in the above-mentioned embodiment, outdoor humidity is higher, and at this moment, the outdoor unit of air conditioner produces the problem of frosting easily, consequently, the control opens the third throttling arrangement of cooling branch road to the refrigerant that utilizes the cooling branch road of flowing through carries out the heat exchange with automatically controlled spare, and the refrigerant after will rising the temperature is carried back to the compressor, in order to utilize the waste heat of electrical control spare to promote the compression efficiency of compressor. Here, the third throttling device for opening the cooling branch can improve the external heat conduction efficiency of the electric control part, and compared with a mode that the electric control part exchanges heat with the refrigerant of the liquid storage device, the heat dissipation device for the cooling branch can improve the heat exchange efficiency of the refrigerant and the electric control part.
Optionally, according to outdoor temperature Tao and outdoor humidity RH, determine the start-stop state of the third throttling device of the cooling branch and the degree of valve when opening, including: and determining the valve opening degree of the third throttling device in the opening state according to the outdoor humidity RH.
Specifically, the outdoor humidity RH may be obtained in step S1202, and then the valve opening degree of the third throttling device may be calculated according to a preset association relationship, for example, an optional association relationship is K9 × RH-400, where K is the valve opening degree. Therefore, the valve opening can be further calculated by substituting the outdoor humidity RH into the above formula, and if the outdoor humidity RH is 50% of the relative humidity RH, the valve opening is calculated according to the above formula to be 50, and then the valve opening can be adjusted to 50, and at this time, the heat exchange requirement of the heating performance of the air conditioner is met.
In an optional embodiment, the control method further comprises: determining a target superheat degree of an air conditioning system or a target discharge temperature of a compressor; and adjusting the opening degree of the throttling device on the inflow side of the flash tank until the air conditioning system reaches the target superheat degree or the compressor reaches the target exhaust temperature.
Taking the target exhaust temperature as an example, the air conditioning system is internally provided with programs such as an operation algorithm of the target exhaust temperature, and the target exhaust temperature of the compressor suitable for the current working condition can be automatically calculated by obtaining one or more parameters set by a user, for example, the air conditioning system is provided with a temperature mapping table, the mapping table can be used for representing the mapping relation between the temperature set by the user and the exhaust temperature of the compressor, and the setting parameter corresponding to each exhaust temperature, for example, when the temperature set by the user is 23 ℃, the exhaust temperature of the compressor mapped by the mapping table is 70 ℃; the user sets a temperature of 26 c, which maps to a compressor discharge temperature of 65 c, and so on. After the set temperature of the user is determined, the exhaust temperature of the compressor and the corresponding set parameters can be determined according to the mapping table, and the operation of relevant parts of the air conditioning system is adjusted, so that the actual exhaust temperature of the compressor reaches the exhaust temperature. Here, the exhaust gas temperature is the aforementioned target exhaust gas temperature.
Here, the user-set temperature is a desired temperature parameter input to the air conditioning system by the user through a remote controller or a control panel.
Or determining the target exhaust temperature according to the outdoor temperature Tao and a preset rule, wherein the preset rule is used for representing the incidence relation between the outdoor temperature Tao and the target exhaust temperature.
It should be understood that the determination manner of the target exhaust temperature is not limited to the mapping table, and the target exhaust temperature may be determined by calculation through a mapping relationship of other parameters or other algorithms, which is not limited to this invention.
In this embodiment, after the air conditioner is turned on, the discharge temperature of the compressor is first adjusted to the target discharge temperature according to the above-mentioned setting parameters, and then the temperature of the electric control element changes with the continuous operation of the air conditioner and the continuous change of the outdoor temperature, so the temperature difference between the outdoor temperature Tao and the temperature Tx of the heat sink changes continuously, which makes the temperature of the refrigerant flowing back to the compressor not only unchanged, therefore, after the compressor of the air conditioning system operates for a period of time, although the compressor still operates with the setting parameters, the actual discharge temperature often does not conform to the target discharge temperature, and the readjustment of the setting parameters is more variable, the process is complex, and most air conditioning systems are not set with related secondary calculation algorithms, therefore, on the premise that the setting parameters of the air conditioning system are not reset, the temperature of the refrigerant flowing back to the compressor is changed by adjusting the opening degree of one or more throttling devices, so that the actual exhaust temperature of the adjusted compressor can be consistent with the target exhaust temperature, the heat exchange requirement of the air conditioner is met, and the secondary adjustment process of the exhaust temperature is effectively simplified.
Specifically, the present invention achieves the objective of changing the target discharge temperature of the compressor by controlling the manner in which the opening degree of the throttling device on the inflow side of the flash tank is reduced. Here, when the air conditioner operates in different operation modes, the flow direction of the refrigerant in the first pipeline is also different, for example, in the air conditioning system structure shown in fig. 1, when the air conditioner operates in a cooling mode, the flow direction of the refrigerant in the first pipeline is from left to right, at this time, the side where the first throttling device is located is the inflow side of the flash tank, and the side where the second throttling device is located is the outflow side of the flash tank; when the air conditioner operates in a heating mode, the refrigerant flows in the first pipeline from right to left, at the moment, the side where the first throttling device is located is the outflow side of the flash tank, and the side where the second throttling device is located is the inflow side of the flash tank.
Therefore, when the air conditioner operates in a cooling mode, when the working condition is met, the opening degree of the first throttling device is controlled to be reduced; when the air conditioner operates in the heating mode, the opening degree of the second throttling device is controlled to be reduced.
Here, the refrigerant has its own temperature and pressure decreased after passing through the throttling device. Therefore, by reducing the opening degree of the throttling device on the inflow side of the flash evaporator, the temperature and pressure of the refrigerant flowing into the flash evaporator can be reduced, and the temperature and pressure of the refrigerant flowing back to the compressor can be further reduced, so that the actual exhaust temperature of the compressor can be adjusted to the target exhaust temperature by the above manner.
Alternatively, the opening degree of the throttling means at the inflow side of the flash tank may be gradually decreased to a certain opening degree value at a set rate, or the opening degree of the throttling means at the inflow side may be directly decreased to a set opening degree value or values until the actual discharge temperature of the compressor reaches the target discharge temperature.
Alternatively, when the throttling device at the inflow side of the flash tank is decreased at a set rate, the set rate may be predetermined according to a predetermined rule, for example, the rate has a predetermined proportional relationship with the temperature difference value, so that after the temperature difference value is determined, the set rate is obtained according to the predetermined proportional relationship, and the opening degree of the throttling device is decreased according to the rate, so that the discharge temperature of the compressor reaches the target discharge temperature.
Fig. 13 is a block diagram showing the configuration of a control device of an air conditioning system of the present invention according to embodiment (a).
Embodiment (one) of the present invention also provides a control device of an air conditioning system, which can be used to control the air conditioning system shown in fig. 1 to perform the control method disclosed in embodiment (one) described above; the control device 1300 includes:
an obtaining unit 1310 configured to obtain an outdoor ambient temperature Tao and a heat sink temperature Tx;
a first control unit 1320, configured to modify the target discharge temperature of the compressor if the temperature difference value between the outdoor environment temperature Tao and the heat sink temperature Tx is not less than the preset temperature difference threshold, and control to adjust the opening degree of the throttling device until the temperature difference value between the outdoor environment temperature Tao and the heat sink temperature Tx is less than the preset temperature difference threshold when the compressor operates at the modified discharge temperature.
In an alternative embodiment, the control device further comprises a second control unit for: and if the temperature difference value between the outdoor environment temperature Tao and the cooling fin temperature Tx is smaller than a preset temperature difference threshold value, controlling and adjusting the opening of the throttling device until the target exhaust temperature of the compressor is reached.
In an alternative embodiment, the first control unit 1320 is specifically adapted to controlling the opening degree of the throttling means that reduces the inflow side of the flash tank;
the second control unit is specifically adapted to controlling the opening of the throttling means reducing the inflow side of the flash tank.
In an alternative embodiment, the first control unit 1320 is specifically configured to: and controlling to reduce the target exhaust temperature of the compressor to a corrected value by adjusting the operating parameters of the compressor, wherein the corrected exhaust temperature is the target exhaust temperature.
In an alternative embodiment, the control device 1300 further comprises a determination unit for: and determining the target exhaust temperature according to the outdoor environment temperature Tao and a preset rule, wherein the preset rule is used for representing the incidence relation between the outdoor environment temperature Tao and the target exhaust temperature.
Fig. 14 is a block diagram showing the configuration of the control device of the air conditioning system according to the second embodiment of the present invention.
Embodiment (two) of the present invention also provides a control device of an air conditioning system, which can be used to control the air conditioning system shown in fig. 1 to perform the control method disclosed in embodiment (two) described above; the control device 1400 includes:
an acquisition unit 1410 for acquiring an outdoor ambient temperature Tao and a fin temperature Tx;
a first control unit 1420, configured to control to adjust the opening degree of the throttling device if the temperature difference between the outdoor ambient temperature Tao and the heat sink temperature Tx is not less than the preset temperature difference threshold value, until the temperature difference between the outdoor ambient temperature Tao and the heat sink temperature Tx is less than the preset temperature difference threshold value when the compressor operates at the target discharge temperature.
In an alternative embodiment, the control device further comprises a second control unit for: and if the temperature difference value between the outdoor environment temperature Tao and the cooling fin temperature Tx is smaller than a preset temperature difference threshold value, controlling to reduce the opening degree of the throttling device on the inflow side of the flash tank until the target exhaust temperature of the compressor is reached.
In an alternative embodiment, the first control unit 1420 is specifically configured to: and controlling and adjusting the opening degree of a third throttling device of the cooling branch.
In an alternative embodiment, the first control unit 1420 is specifically configured to: the third throttling means is controlled to turn on at a set pulse rate.
In an alternative embodiment, the control device 1400 further comprises a determining unit for: and determining the target exhaust temperature according to the outdoor environment temperature Tao and a preset rule, wherein the preset rule is used for representing the incidence relation between the outdoor environment temperature Tao and the target exhaust temperature.
Fig. 15 is a block diagram showing the configuration of the control device of the air conditioning system of the present invention according to the embodiment (three).
Embodiment (three) of the present invention also provides a control device of an air conditioning system, which can be used to control the air conditioning system shown in fig. 1 to perform the control method disclosed in embodiment (three) described above; the control device 1500 includes:
an obtaining unit 1510 configured to obtain an outdoor ambient temperature Tao and a heat sink temperature Tx;
and a first control unit 1520, configured to modify the target superheat degree of the air conditioning system if the temperature difference between the outdoor environment temperature Tao and the heat sink temperature Tx is not less than the preset temperature difference threshold, and control to adjust the opening degree of the throttling device until the temperature difference between the outdoor environment temperature Tao and the heat sink temperature Tx is less than the preset temperature difference threshold when the air conditioning system operates at the modified superheat degree.
In an alternative embodiment, the control device further comprises a second control unit for: and if the temperature difference value between the outdoor environment temperature Tao and the cooling fin temperature Tx is smaller than the preset temperature difference threshold value, maintaining the current running state unchanged.
In an alternative embodiment, the first control unit 1420 is specifically configured to: the opening of the throttling device on the inflow side of the flash tank is controlled to be reduced.
In an alternative embodiment, the first control unit 1420 is specifically configured to: and controlling to reduce the target superheat degree to a corrected value by adjusting the operating parameters of the compressor, wherein the corrected value is the corrected superheat degree.
In an alternative embodiment, the control device 1500 further comprises:
the detection unit is used for detecting the air suction temperature of the compressor and the temperature of an inner coil of the air conditioning system;
and the calculating unit is used for calculating the difference value between the suction temperature and the temperature of the inner coil pipe to obtain the superheat degree.
Fig. 16 is a block diagram showing the configuration of the control device of the air conditioning system of the present invention according to the embodiment (four).
Embodiment (iv) of the present invention also provides a control device of an air conditioning system, which can be used to control the air conditioning system shown in fig. 1 to perform the control method disclosed in embodiment (iv) described above; the control device 1600 includes:
an obtaining unit 1610 configured to obtain an outdoor ambient temperature Tao and a fin temperature Tx;
and a first control unit 1620, configured to control and adjust the opening degree of the throttling device if the temperature difference value between the outdoor environment temperature Tao and the heat sink temperature Tx is not less than the preset temperature difference threshold value, until the temperature difference value between the outdoor environment temperature Tao and the heat sink temperature Tx is less than the preset temperature difference threshold value when the compressor operates at the target superheat degree.
In an alternative embodiment, the control device further comprises a second control unit for: and if the temperature difference value between the outdoor environment temperature Tao and the cooling fin temperature Tx is smaller than the preset temperature difference threshold value, maintaining the current running state unchanged.
In an alternative embodiment, the first control unit 1620 is specifically configured to: and controlling and adjusting the opening degree of a third throttling device of the cooling branch.
In an alternative embodiment, the first control unit 1620 is specifically configured to: the third throttling means is controlled to turn on at a set pulse rate.
In an alternative embodiment, the control device 1600 further comprises:
the detection unit is used for detecting the air suction temperature of the compressor and the temperature of an inner coil of the air conditioning system;
and the calculating unit is used for calculating the difference value between the suction temperature and the temperature of the inner coil pipe to obtain the superheat degree.
Fig. 17 is a block diagram showing the configuration of the control device of the air conditioning system of the present invention according to the embodiment (v).
Embodiment (five) of the present invention also provides a control device of an air conditioning system, which can be used to control the air conditioning system shown in fig. 1 to perform the control method disclosed in embodiment (five) described above; the control device 1700 includes:
an acquisition unit 1710 for acquiring an outdoor ambient temperature Tao and a fin temperature Tx;
a first control unit 1720 for determining an adjustment rate according to the temperature difference value if the temperature difference value between the outdoor environment temperature Tao and the heat sink temperature Tx is not less than a preset temperature difference threshold value, and controlling and adjusting the third throttling device according to the determined adjustment rate until the temperature difference value between the outdoor environment temperature Tao and the heat sink temperature Tx is less than the preset temperature difference threshold value.
In an alternative embodiment, the first control unit 1720 further comprises a calculation unit for: the regulation rate is calculated according to the following formula:
wherein v is the adjustment rate and Δ t is the temperature difference value.
In an alternative embodiment, the control apparatus 1700 further comprises a second control unit for: and if the temperature difference value between the outdoor environment temperature Tao and the cooling fin temperature Tx is smaller than the preset temperature difference threshold value, maintaining the current running state unchanged.
In an alternative embodiment, the control device 1700 further comprises a third control unit for: and when the temperature difference value between the external environment temperature Tao and the cooling fin temperature Tx is smaller than a preset temperature difference threshold value, adjusting and controlling the opening degree of a throttling device on the inflow side of the flash evaporator until the compressor reaches the target exhaust temperature.
In an alternative embodiment, the control apparatus 1700 further comprises a fourth control unit for: and when the temperature difference value between the external environment temperature Tao and the cooling fin temperature Tx is smaller than a preset temperature difference threshold value, adjusting and controlling the opening degree of a throttling device on the inflow side of the flash tank until the air conditioning system reaches the target superheat degree.
Fig. 18 is a block diagram showing the configuration of a control device of an air conditioning system of the present invention according to the sixth embodiment.
Embodiment (six) of the present invention also provides a control device of an air conditioning system, which can be used to control the air conditioning system shown in fig. 1 to perform the control method disclosed in embodiment (six) described above; the control device 1800 includes:
an obtaining unit 1810 configured to obtain an outdoor temperature Tao and an outdoor humidity RH;
the first determining unit 1820 is configured to determine, according to the outdoor temperature Tao and the outdoor humidity RH, a start-stop state of the third throttling device of the cooling branch and a degree of opening the third throttling device.
In an optional implementation manner, the first determining unit 1820 is specifically configured to:
when the outdoor temperature Tao is greater than or equal to the preset outdoor temperature threshold value, or
When the outdoor temperature Tao is less than the external temperature threshold and the outdoor humidity RH is less than the preset humidity threshold,
the third throttling means controlling the cooling branch remains off.
In an optional implementation manner, the first determining unit 1820 is specifically configured to: and when the outdoor humidity RH is greater than a preset humidity threshold value, controlling a third throttling device of the cooling branch circuit to be in an open state.
In an optional implementation manner, the first determining unit 1820 is specifically configured to: and determining the valve opening degree of the third throttling device in the opening state according to the outdoor humidity RH.
In an alternative embodiment, the control device 1800 further comprises:
a second determination unit for determining a target superheat degree of the air conditioning system or a target discharge temperature of the compressor;
and the adjusting unit is used for adjusting the opening degree of the throttling device on the inflow side of the flash tank until the air conditioning system reaches the target superheat degree or the compressor reaches the target exhaust temperature.
It is to be understood that the present invention is not limited to the procedures and structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.

Claims (8)

1. The control method of the air conditioning system is characterized in that the air conditioning system comprises a refrigerant circulation loop and a cooling branch, the refrigerant circulation loop comprises an indoor heat exchanger, an outdoor heat exchanger, a four-way valve, a liquid storage device and a compressor which are connected through refrigerant pipes, the first end of the cooling branch is connected to a flash evaporator of a refrigerant pipe section between the indoor heat exchanger and the outdoor heat exchanger, the second end of the cooling branch is connected to the inlet end of the liquid storage device, and the cooling branch is provided with a heat dissipation device; the air conditioning system also comprises an electric control part, wherein the electric control part, the heat dissipation device and the liquid storage device are arranged adjacently, and heat exchange can be carried out among the electric control part, the heat dissipation device and the liquid storage device; the air conditioning system also comprises a throttling device, wherein the throttling device comprises a first throttling device arranged at a first refrigerant subsection between the flash evaporator and the outdoor heat exchanger, a second throttling device arranged at a second refrigerant subsection between the flash evaporator and the indoor heat exchanger, and a third throttling device arranged at the cooling branch; the control method comprises the following steps:
acquiring an outdoor environment temperature Tao and a radiating fin temperature Tx;
if the temperature difference value between the outdoor environment temperature Tao and the cooling fin temperature Tx is not smaller than the preset temperature difference threshold value, the target exhaust temperature of the compressor is controlled to be reduced to a corrected value by adjusting the operation parameters of the compressor, the corrected exhaust temperature is the corrected exhaust temperature, the opening degree of the throttling device is controlled to be adjusted until the temperature difference value between the outdoor environment temperature Tao and the cooling fin temperature Tx is smaller than the preset temperature difference threshold value when the compressor operates at the corrected exhaust temperature.
2. The control method according to claim 1, characterized by further comprising:
and if the temperature difference value between the outdoor environment temperature Tao and the cooling fin temperature Tx is smaller than a preset temperature difference threshold value, controlling and adjusting the opening of the throttling device until the target exhaust temperature of the compressor is reached.
3. The control method according to claim 1 or 2, wherein the controlling adjusts an opening degree of a throttle device, including:
controlling to reduce the opening of the throttling device on the inflow side of the flash tank.
4. The control method according to claim 1, characterized by further comprising:
and determining the target exhaust temperature according to the outdoor environment temperature Tao and a preset rule, wherein the preset rule is used for representing the incidence relation between the outdoor environment temperature Tao and the target exhaust temperature.
5. The control device of the air conditioning system is characterized by comprising a refrigerant circulation loop and a cooling branch, wherein the refrigerant circulation loop comprises an indoor heat exchanger, an outdoor heat exchanger, a four-way valve, a liquid storage device and a compressor which are connected through a refrigerant pipe; the air conditioning system also comprises an electric control part, wherein the electric control part, the heat dissipation device and the liquid storage device are arranged adjacently, and heat exchange can be carried out among the electric control part, the heat dissipation device and the liquid storage device; the air conditioning system also comprises a throttling device, wherein the throttling device comprises a first throttling device arranged at a first refrigerant subsection between the flash evaporator and the outdoor heat exchanger, a second throttling device arranged at a second refrigerant subsection between the flash evaporator and the indoor heat exchanger, and a third throttling device arranged at the cooling branch; the control device includes:
an acquisition unit for acquiring an outdoor ambient temperature Tao and a fin temperature Tx;
the first control unit is used for controlling and reducing the target exhaust temperature of the compressor to a corrected value by adjusting the operation parameters of the compressor if the temperature difference value between the outdoor environment temperature Tao and the cooling fin temperature Tx is not less than a preset temperature difference threshold value, wherein the corrected value is the corrected exhaust temperature, and controlling and adjusting the opening of the throttling device until the temperature difference value between the outdoor environment temperature Tao and the cooling fin temperature Tx is less than the preset temperature difference threshold value when the compressor operates at the corrected exhaust temperature.
6. The control device according to claim 5, characterized in that the control device further comprises a second control unit for:
and if the temperature difference value between the outdoor environment temperature Tao and the cooling fin temperature Tx is smaller than a preset temperature difference threshold value, controlling and adjusting the opening of the throttling device until the target exhaust temperature of the compressor is reached.
7. The control device according to claim 5 or 6,
the first control unit is specifically used for controlling and reducing the opening degree of a throttling device at the inflow side of the flash tank;
the second control unit is specifically adapted to control the opening of the throttling means that reduces the inflow side of the flash tank.
8. The control device according to claim 5, characterized by further comprising a determination unit configured to:
and determining the target exhaust temperature according to the outdoor environment temperature Tao and a preset rule, wherein the preset rule is used for representing the incidence relation between the outdoor environment temperature Tao and the target exhaust temperature.
CN201810294680.0A 2018-03-30 2018-03-30 Control method and device of air conditioning system Active CN108548252B (en)

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CN111397168A (en) * 2020-03-24 2020-07-10 珠海格力电器股份有限公司 Control method and device of air conditioning system, control equipment, medium and air conditioning system

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