CN113669843A - Control method of air conditioning system and air conditioning system - Google Patents

Control method of air conditioning system and air conditioning system Download PDF

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Publication number
CN113669843A
CN113669843A CN202010365280.1A CN202010365280A CN113669843A CN 113669843 A CN113669843 A CN 113669843A CN 202010365280 A CN202010365280 A CN 202010365280A CN 113669843 A CN113669843 A CN 113669843A
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CN
China
Prior art keywords
heat exchanger
exchanger group
communicated
throttling device
air
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010365280.1A
Other languages
Chinese (zh)
Inventor
罗建文
毛守博
卢大海
何建奇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
Original Assignee
Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Qingdao Haier Air Conditioning Electric Co Ltd, Haier Smart Home Co Ltd filed Critical Qingdao Haier Air Conditioning Electric Co Ltd
Priority to CN202010365280.1A priority Critical patent/CN113669843A/en
Priority to PCT/CN2021/078566 priority patent/WO2021218350A1/en
Publication of CN113669843A publication Critical patent/CN113669843A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/41—Defrosting; Preventing freezing
    • F24F11/42—Defrosting; Preventing freezing of outdoor units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/89—Arrangement or mounting of control or safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02—Defrosting cycles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/10—Pressure
    • F24F2140/12—Heat-exchange fluid pressure

Abstract

The invention relates to the field of air conditioners, in particular to a control method of an air conditioning system and the air conditioning system. The invention aims to solve the problem that the heating effect of an indoor unit is poor when an outdoor heat exchanger of an air conditioning unit is defrosted. The air suction port of the compressor of the air conditioning system is communicated with the first reversing device and the second reversing device; two ends of the air pipe are communicated with the second reversing device and the indoor unit; one end of the first heat exchanger group is communicated with the first reversing device, and the other end of the first heat exchanger group is communicated with the indoor unit through a liquid pipe; one end of the second heat exchanger group is communicated with the first reversing device, and the other end of the second heat exchanger group is communicated with the indoor unit through a liquid pipe; the first throttling device adjusts the flow of the refrigerant flowing into the first reversing device. The control method comprises the following steps: determining the working mode of the air conditioning system; and when the working mode is the first heat exchanger group defrosting mode or the second heat exchanger group defrosting mode, adjusting the opening degree of the first throttling device according to a preset condition. Therefore, when the first heat exchanger group or the second heat exchanger group defrosts, the heating effect of the indoor unit can be ensured.

Description

Control method of air conditioning system and air conditioning system
Technical Field
The invention relates to the technical field of air conditioning, in particular to a control method for an air conditioning system and the air conditioning system.
Background
When the existing air conditioning unit operates in a defrosting mode, the direction is changed by a four-way valve, the refrigeration operation mode is switched, an indoor heat exchanger is used as an evaporator, an outdoor heat exchanger is used as a condenser, and a frost layer is melted by heat dissipated by condensation of the condenser. Therefore, during defrosting, since the indoor heat exchanger is an evaporator, the indoor ambient temperature may be lowered, resulting in an uncomfortable experience for the user.
In order to solve the technical problems, in the prior art, a plurality of outdoor heat exchangers are arranged on the basis of a common multi-split air conditioner, a high-temperature pipe is led out from an exhaust port of a compressor and is connected to a pipeline of an outside condenser through an electric control valve, and when defrosting is needed in the heating operation process, one heat exchanger in an outdoor unit can be continuously used as an evaporator according to a heating mode and the other heat exchanger is used as a condenser for defrosting under the condition that the heating mode is not changed.
However, since the condenser is filled with high-pressure liquid, the refrigerant flowing through the defrosting refrigerant has a relatively large flow rate, and the refrigerant that naturally continues to flow through the indoor heat exchanger to perform heating is relatively small, thereby affecting the heating effect of the indoor unit during defrosting.
Accordingly, there is a need in the art for a new control method for an air conditioning system to solve the above-mentioned problems.
Disclosure of Invention
In order to solve the above problems in the prior art, that is, to solve the problem of poor heating effect of an indoor unit when an outdoor heat exchanger defrosts existing in an existing air conditioning unit, the present invention provides a control method of an air conditioning system, wherein the air conditioning system includes a compressor, a first reversing device, a second reversing device, a first heat exchanger set, a second heat exchanger set, an air pipe, a liquid pipe, an indoor unit, and a first throttling device; the air outlet of the compressor is communicated with the first reversing device and the second reversing device at the same time, and the air suction port of the compressor is communicated with the first reversing device and the second reversing device at the same time; two ends of the air pipe are respectively communicated with the second reversing device and the indoor unit; one end of the first heat exchanger group is communicated with the first reversing device, and the other end of the first heat exchanger group is communicated with the indoor unit through the liquid pipe; one end of the second heat exchanger group is communicated with the first reversing device, and the other end of the second heat exchanger group is communicated with the indoor unit through the liquid pipe; the first throttling device is arranged between the first reversing device and the exhaust port and is used for adjusting the flow of the refrigerant flowing into the first reversing device; the first and second commutation devices are configured to: when the first heat exchanger group defrosts, the air pipe and the first heat exchanger group are communicated with the air outlet, and the second heat exchanger group is communicated with the air suction port; when the second heat exchanger group defrosts, the air pipe and the second heat exchanger group are communicated with the air outlet, and the first heat exchanger group is communicated with the air suction port; during refrigeration, the first heat exchanger group and the second heat exchanger group are communicated with the exhaust port, and the air pipe is communicated with the air suction port; when heating, the first heat exchanger group and the second heat exchanger group are communicated with the air suction port, and the air pipe is communicated with the air exhaust port; the control method comprises the following steps: determining an operating mode of the air conditioning system, wherein the operating mode comprises a cooling mode, a heating mode, a first heat exchanger group defrosting mode and a second heat exchanger group defrosting mode; and when the working mode is the first heat exchanger group defrosting mode or the second heat exchanger group defrosting mode, adjusting the opening degree of the first throttling device according to a preset condition.
In a preferred technical solution of the above control method, the air conditioning system further includes a first pressure sensor, the first pressure sensor is disposed between the first throttling device and the first reversing device, and the adjusting the first throttling device according to a preset condition specifically includes: determining a target condensing pressure; determining and acquiring the real-time pressure of a refrigerant flowing into the first reversing device; and comparing the condensing pressure with the real-time pressure, and adjusting the opening of the first throttling device according to the comparison result.
In a preferred technical solution of the above control method, the air conditioning system further includes a second pressure sensor disposed at the air outlet, where the second pressure sensor is configured to detect a refrigerant pressure at the air outlet, and the determining the target condensing pressure specifically includes: determining to acquire the exhaust pressure at the exhaust port; determining the target condensing pressure according to the exhaust pressure.
In a preferred embodiment of the above control method, the adjusting the opening degree of the first throttle device according to the comparison result specifically includes: when the real-time pressure is smaller than the condensing pressure, the opening degree of the first throttling device is increased; otherwise, judging whether the real-time pressure is greater than the condensing pressure; and when the real-time pressure is greater than the condensing pressure, reducing the opening degree of the first throttling device, otherwise, keeping the opening degree of the first throttling device unchanged.
In a preferred technical solution of the above control method, the air conditioning system further includes a second throttling device, a third throttling device, and a fourth throttling device; the second throttling device is arranged between the first heat exchanger group and the liquid pipe; the third throttling device is arranged between the second heat exchanger group and the liquid pipe; one end of the fourth throttling device is connected between the first heat exchanger group and the second throttling device, and the other end of the fourth throttling device is connected between the second heat exchanger group and the third throttling device; the control method further comprises the following steps: when the working mode is the defrosting mode of the first heat exchanger group, the second throttling device is closed, and the fourth throttling device is opened; when the working mode is a second heat exchanger group defrosting mode, the third throttling device is closed, and the fourth throttling device is opened; and when the working mode is a cooling mode or a heating mode, closing the fourth throttling device, and opening the second throttling device and the third throttling device.
The present invention also provides an air conditioning system, comprising: the air conditioner comprises a compressor, a first reversing device, a second reversing device, a first heat exchanger group, a second heat exchanger group, an air pipe, a liquid pipe, an indoor unit, a first throttling device and a controller; the air outlet of the compressor is communicated with the first reversing device and the second reversing device at the same time, and the air suction port of the compressor is communicated with the first reversing device and the second reversing device at the same time; two ends of the air pipe are respectively communicated with the second reversing device and the indoor unit; one end of the first heat exchanger group is communicated with the first reversing device, and the other end of the first heat exchanger group is communicated with the indoor unit through the liquid passing pipe; one end of the second heat exchanger group is communicated with the first reversing device, and the other end of the second heat exchanger group is communicated with the indoor unit through the liquid pipe; the first throttling device is arranged between the first reversing device and the exhaust port and is used for adjusting the flow of the refrigerant flowing into the first reversing device; the first and second commutation devices are configured to: when the first heat exchanger group defrosts, the first heat exchanger group is communicated with the air outlet, and the second heat exchanger group is communicated with the air suction port; when the second heat exchanger group defrosts, the second heat exchanger group is communicated with the exhaust port, and the first heat exchanger group is communicated with the suction port; during refrigeration, the first heat exchanger group and the second heat exchanger group are communicated with the exhaust port, and the air pipe is communicated with the air suction port; when heating, the first heat exchanger group and the second heat exchanger group are communicated with the air suction port, and the air pipe is communicated with the air exhaust port; the controller is communicatively coupled to the first throttling device.
In a preferred embodiment of the above air conditioning system, the air conditioning system further includes: the first pressure sensor is arranged between the first throttling device and the first reversing device, and the first pressure sensor is in communication connection with the controller.
In a preferred embodiment of the above air conditioning system, the air conditioning system further includes: and the second pressure sensor is arranged at the air outlet and is in communication connection with the controller and used for detecting the pressure of the refrigerant at the air outlet.
In a preferred embodiment of the above air conditioning system, the air conditioning system further includes: a second throttling device, a third throttling device and a fourth throttling device all in communication connection with the controller; the second throttling device is arranged between the first heat exchanger group and the liquid pipe; the third throttling device is arranged between the second heat exchanger group and the liquid pipe; one end of the fourth throttling device is connected between the first heat exchanger group and the second throttling device, and the other end of the fourth throttling device is connected between the second heat exchanger group and the third throttling device.
In a preferred embodiment of the above air conditioning system, the air conditioning system further includes: the low-pressure air pipe is communicated with the air suction port; the indoor unit comprises a valve box and an indoor heat exchanger connected with the valve box, and the air pipe, the liquid pipe and the low-pressure air pipe are communicated with the valve box.
As can be understood by those skilled in the art, in a preferred embodiment of the present invention, an air conditioning system includes a compressor, a first reversing device, a second reversing device, a first heat exchanger set, a second heat exchanger set, an air pipe, a liquid pipe, an indoor unit, and a first throttling device; the air exhaust port of the compressor is communicated with the first reversing device and the second reversing device at the same time, and the air suction port of the compressor is communicated with the first reversing device and the second reversing device at the same time; two ends of the air pipe are respectively communicated with the second reversing device and the indoor unit; one end of the first heat exchanger group is communicated with the first reversing device, and the other end of the first heat exchanger group is communicated with the indoor unit through a liquid pipe; one end of the second heat exchanger group is communicated with the first reversing device, and the other end of the second heat exchanger group is communicated with the indoor unit through a liquid pipe; the first throttling device is arranged between the first reversing device and the exhaust port and is used for adjusting the flow of the refrigerant flowing into the first reversing device; the first and second commutation devices are configured to: when the first heat exchanger group defrosts, the air pipe and the first heat exchanger group are communicated with the air outlet, and the second heat exchanger group is communicated with the air suction port; when the second heat exchanger group defrosts, the air pipe and the second heat exchanger group are communicated with the air outlet, and the first heat exchanger group is communicated with the air suction port; during refrigeration, the first heat exchanger group and the second heat exchanger group are communicated with the exhaust port, and the air pipe is communicated with the air suction port; when heating, the first heat exchanger group and the second heat exchanger group are communicated with the air suction port, and the air pipe is communicated with the air exhaust port; the control method comprises the following steps: determining an operating mode of the air conditioning system, wherein the operating mode comprises a refrigeration mode, a heating mode, a first heat exchanger group defrosting mode and a second heat exchanger group defrosting mode; and when the working mode is the first heat exchanger group defrosting mode or the second heat exchanger group defrosting mode, adjusting the opening degree of the first throttling device according to preset conditions.
In this scheme, through adjusting first throttling arrangement's aperture, when making first heat exchanger group or second heat exchanger group defrost, can increase the refrigerant that flows to the indoor set when satisfying the defrosting demand, and then improve the efficiency of heating of indoor set, guarantee the effect of heating of indoor set.
Specifically, through first switching-over device and second switching-over device, can realize the flow direction regulation of refrigerant, promptly:
when the first heat exchanger group defrosts, the air pipe and the first heat exchanger group are communicated with the air outlet, and the second heat exchanger group is communicated with the air suction port;
when the second heat exchanger group defrosts, the air pipe and the second heat exchanger group are communicated with the air outlet, and the first heat exchanger group is communicated with the air suction port;
during refrigeration, the first heat exchanger group and the second heat exchanger group are communicated with the exhaust port, and the air pipe is communicated with the air suction port;
when heating, the first heat exchanger group and the second heat exchanger group are communicated with the air suction port, and the air pipe is communicated with the air exhaust port.
The control method of the technical scheme comprises the following steps: determining an operating mode of the air conditioning system, wherein the operating mode comprises a refrigeration mode, a heating mode, a first heat exchanger group defrosting mode and a second heat exchanger group defrosting mode; when the working mode is the first heat exchanger group defrosting mode or the second heat exchanger group defrosting mode, part of the refrigerant discharged by the compressor flows into the indoor unit at the moment, and part of the refrigerant flows into the first heat exchanger group or the second heat exchanger group for defrosting. The opening degree of the first throttling device is adjusted according to preset conditions, so that the flow of the refrigerant flowing into the indoor unit is increased on the premise that the pressure of the refrigerant in the first heat exchanger group or the second heat exchanger group for defrosting meets the defrosting requirement, and the indoor unit can keep the heating efficiency during defrosting. Meanwhile, the refrigerant in the first heat exchanger group or the second heat exchanger group for defrosting can be effectively prevented from gathering, and the heating effect of the indoor unit is ensured.
Furthermore, by arranging the first pressure sensor, the real-time pressure of the refrigerant of the first reversing device, namely the pressure of the refrigerant of the first heat exchanger group or the second heat exchanger group for defrosting, can be obtained through the first pressure sensor, the opening degree of the first throttling device is adjusted according to the comparison between the real-time pressure and the target condensing pressure, the refrigerant pressure in the first heat exchanger group or the second heat exchanger group for defrosting can meet the defrosting requirement, and the problems that the refrigerant pressure in the first heat exchanger group or the second heat exchanger group for defrosting is too low, the defrosting efficiency is too low, or the refrigerant pressure in the first heat exchanger group or the second heat exchanger group for defrosting is too high, and the heating efficiency of the indoor unit is too low are solved.
Further, by arranging the second pressure sensor, the exhaust pressure at the exhaust port of the compressor can be obtained through the second pressure sensor, and the target condensing pressure is determined according to the exhaust pressure, so that the distribution of the refrigerant can be more reasonable.
Furthermore, when the working mode is defrosting of the first heat exchanger group, the second throttling device is closed, and the fourth throttling device is opened, so that the refrigerant in the first heat exchanger group directly flows into the second heat exchanger group through the fourth throttling valve, and the refrigerant is prevented from failing to flow in the first heat exchanger group due to the low pressure of the refrigerant in the first heat exchanger group.
Similarly, when the second heat exchanger group is defrosted in the working mode, the third throttling device is closed, and the fourth throttling device is opened, so that the refrigerant in the second heat exchanger group directly flows into the first heat exchanger group through the fourth throttling valve, and the problem that the refrigerant cannot flow in the second heat exchanger group due to the fact that the pressure of the refrigerant in the second heat exchanger group is low is prevented.
According to the air conditioning system provided by the invention, the controller enables the first heat exchanger group or the second heat exchanger group to meet the defrosting requirement and simultaneously increase the refrigerant flowing to the indoor unit when defrosting is carried out on the first heat exchanger group or the second heat exchanger group by adjusting the opening of the first throttling device, so that the heating efficiency of the indoor unit is improved, and the heating effect of the indoor unit is ensured.
Further, by arranging the first pressure sensor, the real-time pressure of the refrigerant of the first reversing device, namely the pressure of the refrigerant of the first heat exchanger group or the second heat exchanger group for defrosting, can be obtained through the first pressure sensor, the controller adjusts the opening degree of the first throttling device according to the comparison between the real-time pressure and the target condensing pressure, so that the refrigerant pressure in the first heat exchanger group or the second heat exchanger group for defrosting can meet the defrosting requirement, and the problem that the defrosting efficiency is too low due to too low refrigerant pressure in the first heat exchanger group or the second heat exchanger group for defrosting or the heating efficiency of the indoor unit is too low due to too high refrigerant pressure in the first heat exchanger group or the second heat exchanger group for defrosting is solved.
Further, by arranging the second pressure sensor, the controller can obtain the exhaust pressure at the exhaust port of the compressor through the second pressure sensor, and determine the target condensing pressure according to the exhaust pressure, so that the distribution of the refrigerant is more reasonable.
Furthermore, when the first heat exchanger group defrosts, the controller closes the second throttling device and opens the fourth throttling device, so that the refrigerant in the first heat exchanger group directly flows into the second heat exchanger group through the fourth throttling valve, and the refrigerant is prevented from failing to flow in the first heat exchanger group due to the low pressure of the refrigerant in the first heat exchanger group.
Similarly, when the second heat exchanger group defrosts, the controller closes the third throttling device and opens the fourth throttling device, so that the refrigerant in the second heat exchanger group directly flows into the first heat exchanger group through the fourth throttling device, and the refrigerant is prevented from failing to flow in the second heat exchanger group due to the low pressure of the refrigerant in the second heat exchanger group.
Drawings
A control method of an air conditioning system and an air conditioning system of the present invention will be described below with reference to the accompanying drawings. In the drawings:
fig. 1 is a flow chart of a control method of an air conditioning system in a first embodiment of the present invention;
fig. 2 is a logic block diagram of a control method of an air conditioning system in a first embodiment of the present invention;
fig. 3 is a schematic structural view of an air conditioning system for cooling in a first embodiment of the present invention;
FIG. 4 is a schematic structural diagram of an air conditioning system for heating according to a first embodiment of the present invention;
fig. 5 is a schematic structural view illustrating a defrosting operation of a first heat exchanger group of the air conditioning system according to the first embodiment of the present invention;
fig. 6 is a schematic structural view illustrating a defrosting operation of the second heat exchanger group of the air conditioning system according to the first embodiment of the present invention;
fig. 7 is a schematic structural view of an air conditioning system for cooling in a second embodiment of the present invention;
fig. 8 is a schematic structural view of an air conditioning system for heating according to a second embodiment of the present invention;
fig. 9 is a schematic view showing a structure of a first heat exchanger group of an air conditioning system for defrosting in a second embodiment of the present invention;
fig. 10 is a schematic view showing a structure of a second heat exchanger group of an air conditioning system for defrosting in a second embodiment of the present invention.
List of reference numerals
10. A compressor;
20. the device comprises a first reversing device 21, a first four-way valve 22, a second four-way valve 23, a first electric control valve 24, a second electric control valve 25, a third electric control valve 26 and a fourth electric control valve;
30. a second reversing device;
40. a first heat exchanger group;
50. a second heat exchanger group;
60. an air tube;
70. a liquid pipe;
81. an indoor heat exchanger;
90. a first throttling device;
100. a first pressure sensor;
110. a second pressure sensor;
120. a second throttling device;
130. a third throttling means;
140. a fourth throttling device;
150. a gas-liquid separator.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. For example, although the compressor and the air pipe are connected by the first four-way valve in the drawings, the connection relationship is not constant, and those skilled in the art can adjust the connection relationship as needed to suit specific applications. For example, the first four-way valve may be replaced by three electric control valves, one ends of the three electric control valves are communicated with each other, and the other ends of the three electric control valves are respectively communicated with the exhaust port of the compressor, the suction port of the compressor and the air pipe.
For example, although the present embodiment is described in connection with a dual-control air conditioning unit, this is not intended to limit the scope of the present invention, and those skilled in the art may apply the present invention to other application scenarios without departing from the principles of the present invention. For example, the present invention may also be applied to a three-pipe air conditioning unit.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Example 1
First, referring to fig. 1 to 3, a control method of an air conditioning system of the present invention will be described. Fig. 1 is a flow chart of a control method of an air conditioning system according to a first embodiment of the present invention; fig. 2 is a flow chart of a control method of an air conditioning system in a first embodiment of the present invention; fig. 3 is a schematic structural view of an air conditioning system during cooling according to a first embodiment of the present invention.
As shown in fig. 1 to 3, in order to solve the problem of poor heating effect of an indoor unit when an outdoor heat exchanger is defrosted in the conventional air conditioning unit, the present invention provides a control method of an air conditioning system, wherein, referring to fig. 3, the air conditioning system includes a compressor 10, a first reversing device 20, a second reversing device 30, a first heat exchanger set 40, a second heat exchanger set 50, an air pipe 60, a liquid pipe 70, an indoor unit (not shown in the figure) and a first throttling device 90; the exhaust port of the compressor 10 is communicated with the first reversing device 20 and the second reversing device 30 at the same time, and the suction port of the compressor 10 is communicated with the first reversing device 20 and the second reversing device 30 at the same time; two ends of the air pipe 60 are respectively communicated with the second reversing device 30 and the indoor unit; one end of the first heat exchanger group 40 is communicated with the first reversing device 20, and the other end is communicated with the indoor unit through a liquid pipe 70; one end of the second heat exchanger group 50 is communicated with the first reversing device 20, and the other end is communicated with the indoor unit through a liquid pipe 70; the first throttling device 90 is arranged between the first reversing device 20 and the exhaust port and is used for adjusting the flow rate of the refrigerant flowing into the first reversing device 20; the first commutation device 20 and the second commutation device 30 are configured to: when the first heat exchanger group 40 defrosts, the air pipe 60 and the first heat exchanger group 40 are communicated with the exhaust port, and the second heat exchanger group 50 is communicated with the suction port; when the second heat exchanger group 50 defrosts, the air pipe 60 and the second heat exchanger group 50 are communicated with the air outlet, and the first heat exchanger group 40 is communicated with the air inlet; during cooling, the first heat exchanger group 40 and the second heat exchanger group 50 are communicated with the exhaust port, and the air pipe 60 is communicated with the air suction port; during heating, the first heat exchanger group 40 and the second heat exchanger group 50 are communicated with the air suction port, and the air pipe 60 is communicated with the air exhaust port; referring back to fig. 1, the control method includes:
step S102, determining the working mode of the air conditioning system, wherein the working mode comprises a refrigeration mode, a heating mode, a first heat exchanger group defrosting mode and a second heat exchanger group defrosting mode;
and step S104, when the working mode is the first heat exchanger group defrosting mode or the second heat exchanger group defrosting mode, adjusting the opening degree of the first throttling device 90 according to preset conditions.
Through the above arrangement, when the first heat exchanger set 40 or the second heat exchanger set 50 is defrosted by adjusting the opening of the first throttling device 90, the flow rate of the refrigerant flowing into the indoor unit is increased on the premise that the pressure of the refrigerant in the defrosted first heat exchanger set 40 or the defrosted second heat exchanger set 50 meets the defrosting requirement, so that the indoor unit can maintain the heating efficiency during defrosting. Meanwhile, the refrigerant in the first heat exchanger group 40 or the second heat exchanger group 50 can be effectively prevented from gathering, and the heating effect of the indoor unit is ensured.
Further, the air conditioning system further includes a first pressure sensor 100, the first pressure sensor 100 is disposed between the first throttling device 90 and the first reversing device 20, and the first throttling device 90 is adjusted according to a preset condition, specifically including: determining a target condensing pressure; determining and acquiring the real-time pressure of the refrigerant flowing into the first reversing device 20; the condensing pressure is compared with the real-time pressure, and the opening degree of the first throttling means 90 is adjusted according to the comparison result.
By arranging the first pressure sensor 100, the real-time pressure of the refrigerant of the first reversing device 20, that is, the pressure of the refrigerant of the first heat exchanger group 40 or the second heat exchanger group 50 for defrosting, can be obtained through the first pressure sensor 100, and the opening degree of the first throttling device 90 is adjusted according to the comparison between the real-time pressure and the target condensing pressure, so that the pressure of the refrigerant in the first heat exchanger group 40 or the second heat exchanger group 50 for defrosting can meet the defrosting requirement, and the phenomenon that the defrosting efficiency is too low due to too low pressure of the refrigerant in the first heat exchanger group 40 or the second heat exchanger group 50 for defrosting, or the heating efficiency of the indoor unit is too low due to too high pressure of the refrigerant in the first heat exchanger group 40 or the second heat exchanger group 50 for defrosting is prevented.
Further, the air conditioning system further includes a second pressure sensor 110 disposed at the air outlet, and the second pressure sensor 110 is configured to detect a refrigerant pressure at the air outlet, and determine a target condensing pressure, specifically including: determining and acquiring exhaust pressure at an exhaust port; based on the discharge pressure, a target condensing pressure is determined. For example, the target condensing pressure may be determined according to a corresponding relation table between the discharge pressure and the target condensing pressure, or the target condensing pressure may be determined according to a fitting formula between the discharge pressure and the target condensing pressure, where the corresponding relation table or the fitting formula between the discharge pressure and the target condensing pressure may be determined through experiments, and the corresponding relation table or the fitting formula may be different for different refrigerants.
By providing the second pressure sensor 110, the discharge pressure at the discharge port of the compressor 10 can be obtained by the second pressure sensor 110, and the target condensing pressure is determined according to the discharge pressure, so that the distribution of the refrigerant can be more reasonable.
Further, the air conditioning system further includes a second throttling device 120, a third throttling device 130, and a fourth throttling device 140; the second throttling means 120 are provided between the first heat exchanger group 40 and the liquid pipe 70; the third throttling means 130 is provided between the second heat exchanger group 50 and the liquid pipe 70; the fourth throttling device 140 has one end connected between the first heat exchanger group 40 and the second throttling device 120 and the other end connected between the second heat exchanger group 50 and the third throttling device 130. The control method further comprises the following steps: when the working mode is the defrosting mode of the first heat exchanger group, the second throttling device is closed, and the fourth throttling device is opened; when the working mode is the defrosting mode of the second heat exchanger group, the third throttling device is closed, and the fourth throttling device is opened; and when the working mode is a cooling mode or a heating mode, closing the fourth throttling device, and opening the second throttling device and the third throttling device.
When the working mode is defrosting of the first heat exchanger group, the second throttling device is closed, and the fourth throttling device is opened, so that the refrigerant in the first heat exchanger group directly flows into the second heat exchanger group through the fourth throttling valve, and the problem that the refrigerant cannot flow in the first heat exchanger group due to the fact that the pressure of the refrigerant in the first heat exchanger group is low is prevented.
Similarly, when the second heat exchanger group is defrosted in the working mode, the third throttling device is closed, and the fourth throttling device is opened, so that the refrigerant in the second heat exchanger group directly flows into the first heat exchanger group through the fourth throttling valve, and the problem that the refrigerant cannot flow in the second heat exchanger group due to the fact that the pressure of the refrigerant in the second heat exchanger group is low is prevented.
Referring to fig. 2, a possible control procedure of the control method of the present application will be described. As shown in fig. 2, in one possible embodiment, a control method of an air conditioning system includes:
step S202, determining the working mode of the air conditioning system, wherein the working mode comprises a refrigeration mode, a heating mode, a first heat exchanger group defrosting mode and a second heat exchanger group defrosting mode;
step S204, judging whether the working mode is the defrosting mode of the first heat exchanger group, and generating a first judgment result;
if the first judgment result is yes, step S206 is executed to close the second throttling device 120 and open the fourth throttling device 140;
otherwise, when the first judgment result is negative, step S208 judges whether the operation mode is the defrosting mode of the second heat exchanger group, and generates a second judgment result;
if the second determination result is yes, step S210 is executed to turn off the third throttling device 130 and turn on the fourth throttling device 140;
otherwise, when the second determination result is negative, step S212 is executed to close the fourth throttling device 140 and open the second throttling device 120 and the third throttling device 130;
when step S206 or step S210 is executed, step S214 is executed to obtain the discharge pressure at the discharge port of the compressor 10;
step S216, determining a target condensing pressure according to the exhaust pressure;
step S218, acquiring a real-time pressure of the refrigerant flowing into the first reversing device 20;
step S220, judging whether the target condensing pressure is greater than the real-time pressure, and generating a third judgment result;
if the third determination result is yes, step S224 is executed to decrease the opening degree of the first throttle device 90;
if the third judgment result is no, executing step S222, judging whether the target condensing pressure is less than the real-time pressure, and generating a fourth judgment result;
if the fourth determination result is yes, step S226 is executed to increase the opening degree of the first throttle device 90, and step S220 is executed again until the fourth determination result is no.
Step S228, continuously determining whether the air conditioner operation mode is changed, and resuming to execute step S202 until the determination result is yes.
In this embodiment, step S202 is first performed to determine the operation mode of the air conditioning system, and then step S204 and step S208 are performed to determine whether the operation mode of the air conditioning system belongs to the first heat exchanger group defrosting mode, the second heat exchanger group defrosting mode, the cooling mode, and the heating mode.
If the first determination result is yes, the air conditioning system is in the first heat exchanger set defrosting mode, the second throttling device 120 is closed, and the fourth throttling device 140 is opened, so that the refrigerant in the first heat exchanger set 40 directly flows into the second heat exchanger set 50 through the fourth throttling valve, thereby preventing the refrigerant from flowing in the first heat exchanger set 40 due to the low pressure of the refrigerant in the first heat exchanger set 40.
If the second determination result is yes, the air conditioning system is in the second heat exchanger set defrosting mode, the third throttling device 130 is closed, and the fourth throttling device 140 is opened, so that the refrigerant in the second heat exchanger set 50 directly flows into the first heat exchanger set 40 through the fourth throttling valve, thereby preventing the refrigerant from flowing in the second heat exchanger set 50 due to the low pressure of the refrigerant in the second heat exchanger set 50.
When step S206 or step S210 is executed, step S214 is executed to obtain the discharge pressure at the discharge port of the compressor 10; in step S216, a target condensing pressure is determined according to the exhaust pressure.
Specifically, the corresponding relationship between the exhaust pressure and the target condensing pressure is determined in advance through experiments, and after the exhaust pressure is obtained, the target condensing pressure is determined according to the corresponding relationship between the exhaust pressure and the target condensing pressure.
Step S218, acquiring a real-time pressure flowing to the first reversing device 20;
step S220, judging whether the target condensing pressure is greater than the real-time pressure, and generating a third judgment result;
if the third determination result is yes, step S224 is executed to decrease the opening degree of the first throttle device 90;
if the third judgment result is no, executing step S222, judging whether the target condensing pressure is less than the real-time pressure, and generating a fourth judgment result;
when the fourth determination result is yes, step S226 is executed to increase the opening degree of the first throttle device 90;
after step S224 or step S226 is executed, step S220 is executed again until the fourth determination result is no.
With the above arrangement, the opening degree of the first throttle device 90 is increased or decreased according to the magnitude relationship between the real-time pressure and the condensing pressure, so that the real-time pressure can correspond to the target condensing pressure.
Here, the heating efficiency of the indoor unit, that is, the heat exchange efficiency of the indoor heat exchanger 81.
Example 2
An air conditioning system of the present invention will be described with reference to fig. 3 to 6. Fig. 4 is a schematic structural diagram of an air conditioning system during heating according to a first embodiment of the present invention; fig. 5 is a schematic structural view illustrating a defrosting operation of the first heat exchanger group 40 of the air conditioning system according to the first embodiment of the present invention; fig. 6 is a schematic structural view illustrating a defrosting operation of the second heat exchanger group 50 of the air conditioning system according to the first embodiment of the present invention.
As shown in fig. 3 to 6, the present application also provides an air conditioning system including: the air conditioner comprises a compressor 10, a first reversing device 20, a second reversing device 30, a first heat exchanger group 40, a second heat exchanger group 50, an air pipe 60, a liquid pipe 70, an indoor unit (not shown in the figure), a first throttling device 90 and a controller (not shown in the figure); the exhaust port of the compressor 10 is communicated with the first reversing device 20 and the second reversing device 30 at the same time, and the suction port of the compressor 10 is communicated with the first reversing device 20 and the second reversing device 30 at the same time; two ends of the air pipe 60 are respectively communicated with the second reversing device 30 and the indoor unit; one end of the first heat exchanger group 40 is communicated with the first reversing device 20, and the other end is communicated with the indoor unit through a liquid passing pipe 70; one end of the second heat exchanger group 50 is communicated with the first reversing device 20, and the other end is communicated with the indoor unit through a liquid pipe 70; the first throttling device 90 is arranged between the first reversing device 20 and the exhaust port and is used for adjusting the flow rate of the refrigerant flowing into the first reversing device 20; the first commutation device 20 and the second commutation device 30 are configured to: when the first heat exchanger group 40 defrosts, the air pipe 60 and the first heat exchanger group 40 are communicated with the exhaust port, and the second heat exchanger group 50 is communicated with the suction port; when the second heat exchanger group 50 defrosts, the air pipe 60 and the second heat exchanger group 50 are communicated with the air outlet, and the first heat exchanger group 40 is communicated with the air inlet; during cooling, the first heat exchanger group 40 and the second heat exchanger group 50 are communicated with the exhaust port, and the air pipe 60 is communicated with the air suction port; during heating, the first heat exchanger group 40 and the second heat exchanger group 50 are communicated with the air suction port, and the air pipe 60 is communicated with the air exhaust port; the controller is communicatively coupled to the first throttle device 90.
With the above arrangement, in this scheme, the controller adjusts the opening degree of the first throttling device 90, so that when the first heat exchanger set 40 or the second heat exchanger set 50 defrosts, the defrosting requirement is met, and simultaneously, the refrigerant flowing to the indoor unit can be increased, thereby improving the heating efficiency of the indoor unit and ensuring the heating effect of the indoor unit.
Further, the air conditioning system further includes: and the first pressure sensor 100 is arranged between the first throttling device 90 and the first reversing device 20, and the first pressure sensor 100 is in communication connection with the controller.
By arranging the first pressure sensor 100, the real-time pressure of the refrigerant of the first reversing device 20, that is, the pressure of the refrigerant of the first heat exchanger group 40 or the second heat exchanger group 50 for defrosting, can be obtained by the first pressure sensor 100, and the controller adjusts the opening degree of the first throttling device 90 according to the comparison between the real-time pressure and the target condensing pressure, so that the pressure of the refrigerant in the first heat exchanger group 40 or the second heat exchanger group 50 for defrosting can meet the defrosting requirement, and the condition that the defrosting efficiency is too low, or the heating efficiency of the indoor unit is too low due to too high pressure of the refrigerant in the first heat exchanger group 40 or the second heat exchanger group 50 for defrosting is prevented.
Further, the air conditioning system further includes: and the second pressure sensor 110 is arranged at the air outlet, and the second pressure sensor 110 is in communication connection with the controller and is used for detecting the pressure of the refrigerant at the air outlet.
By arranging the second pressure sensor 110, the controller can obtain the discharge pressure at the discharge outlet of the compressor 10 through the second pressure sensor 110, and determine the target condensing pressure according to the discharge pressure, so that the distribution of the refrigerant can be more reasonable.
Further, the air conditioning system further includes: a second throttling device 120, a third throttling device 130, and a fourth throttling device 140, all communicatively coupled to the controller; the second throttling means 120 are provided between the first heat exchanger group 40 and the liquid pipe 70; the third throttling means 130 is provided between the second heat exchanger group 50 and the liquid pipe 70; the fourth throttling device 140 has one end connected between the first heat exchanger group 40 and the second throttling device 120 and the other end connected between the second heat exchanger group 50 and the third throttling device 130.
When the first heat exchanger group 40 is defrosted, the controller closes the second throttling device 120 and opens the fourth throttling device 140, so that the refrigerant in the first heat exchanger group 40 directly flows into the second heat exchanger group 50 through the fourth throttling valve, and the refrigerant is prevented from failing to flow in the first heat exchanger group 40 due to the low pressure of the refrigerant in the first heat exchanger group 40.
When the second heat exchanger group 50 is defrosted, the controller closes the third throttling device 130 and opens the fourth throttling device 140, so that the refrigerant in the second heat exchanger group 50 directly flows into the first heat exchanger group 40 through the fourth throttling valve, thereby preventing the refrigerant from failing to flow in the second heat exchanger group 50 due to the low pressure of the refrigerant in the second heat exchanger group 50.
Further, in the present embodiment, the first direction changing device 20 includes a first four-way valve 21 and a second four-way valve 22, a D connection pipe of the first four-way valve 21 and a D connection pipe of the second four-way valve 22 are communicated with an exhaust port of the compressor 10, an S connection pipe of the first four-way valve 21 and an S connection pipe of the second four-way valve 22 are communicated with a suction port of the compressor 10, a C connection pipe of the first four-way valve 21 is communicated with the first heat exchanger group 40, and a C connection pipe of the second four-way valve 22 is communicated with the second heat exchanger group 50. In addition, the connection pipe E of the first four-way valve 21 and the connection pipe E of the second four-way valve 22 are blocked or cut off by providing a capillary tube between the connection pipe E and the suction port of the compressor 10.
The second reversing device 30 is an adjusting four-way valve, a D connection pipe of the adjusting four-way valve is communicated with an exhaust port of the compressor 10, an S connection pipe of the adjusting four-way valve is communicated with an air suction port of the compressor 10, and an E connection pipe of the adjusting four-way valve is communicated with the air pipe 60. In addition, the C connection pipe of the adjusting four-way valve is blocked or cut off by arranging a capillary pipe between the C connection pipe and the air suction port of the compressor 10.
Referring to fig. 3, during cooling, the first four-way valve 21, the second four-way valve 22 and the adjusting four-way valve are powered off, the second throttling device 120 is opened to a set opening degree, the third throttling device 130 is opened to a set opening degree, the fourth throttling device 140 is closed, the C connection pipe and the D connection pipe of the first four-way valve 21 are communicated, the C connection pipe and the D connection pipe of the second four-way valve 22 are communicated, and the S connection pipe and the E connection pipe of the adjusting four-way valve are communicated.
The high-temperature and high-pressure gas refrigerant discharged from the exhaust port of the compressor 10 flows into the first heat exchanger group 40 and the second heat exchanger group 50 through the first four-way valve 21 and the second four-way valve 22, and is changed into a high-pressure supercooled liquid refrigerant after releasing heat in the first heat exchanger group 40 and the second heat exchanger group 50, is changed into a low-temperature and low-pressure gas-liquid two-phase refrigerant after being throttled by the throttling device of the indoor unit, is changed into a low-temperature and low-pressure refrigerant gas after absorbing heat in the indoor heat exchanger 81, and finally flows back to the suction port of the compressor 10 through the air pipe 60, thereby completing the cycle.
Referring to fig. 4, during heating, the first four-way valve 21, the second four-way valve 22 and the adjusting four-way valve are powered on, the second throttling device 120 is opened to a set opening degree, the third throttling device 130 is opened to a set opening degree, the fourth throttling device 140 is closed, the C connection pipe and the S connection pipe of the first four-way valve 21 are communicated, the C connection pipe and the S connection pipe of the second four-way valve 22 are communicated, and the D connection pipe and the E connection pipe of the adjusting four-way valve are communicated.
The high-temperature and high-pressure gas refrigerant discharged from the exhaust port of the compressor 10 flows into the indoor heat exchanger 81 through the four-way valve and the air pipe 60, and is changed into a high-pressure supercooled liquid refrigerant after heat is released from the indoor heat exchanger 81, and finally flows to the second throttling device 120 and the third throttling device 130 through the liquid pipe 70, and is changed into a low-temperature and low-pressure gas-liquid two-phase refrigerant after being throttled by the second throttling device 120 and the third throttling device 130, and the gas-liquid two-phase refrigerant absorbs heat in the first heat exchanger group 40 and the second heat exchanger group 50 to be changed into a low-temperature and low-pressure gas, and finally flows back to the suction port of the compressor 10 through the first four-way valve 21 and the second four-way valve 22, thereby completing the cycle.
Referring to fig. 5, when the first heat exchanger group 40 defrosts, the first four-way valve 21 is powered off, the second four-way valve 22 and the adjusting four-way valve are powered on, the second throttling device 120 is turned off, the third throttling device 130 is turned on to a set opening degree, the fourth throttling device 140 is turned on to a set opening degree, at this time, the C connection pipe and the D connection pipe of the first four-way valve 21 are communicated, the C connection pipe and the S connection pipe of the second four-way valve 22 are communicated, and the D connection pipe and the E connection pipe of the adjusting four-way valve are communicated.
A part of the high-temperature and high-pressure gas refrigerant discharged through the discharge port of the compressor 10 flows into the indoor heat exchanger 81 through the four-way valve and the air pipe 60, is changed into a high-pressure supercooled liquid refrigerant after releasing heat in the indoor heat exchanger 81, and finally flows to the third throttling device 130 through the liquid pipe 70; the other part of the refrigerant flows into the first heat exchanger group 40 through the first four-way valve 21, releases heat in the first heat exchanger group 40 to become a high-pressure supercooled liquid refrigerant, and finally flows to the fourth throttling device 140, the high-pressure supercooled liquid refrigerant is throttled by the third throttling device 130 and the fourth throttling device 140 to become a low-temperature low-pressure gas-liquid two-phase refrigerant, absorbs heat in the second heat exchanger group 50 to become a low-temperature low-pressure gas refrigerant, and finally flows back to the suction port of the compressor 10 through the second four-way valve 22 to complete circulation.
It should be noted that, the high-pressure supercooled liquid refrigerant generates pressure drop after being throttled by the third throttling device 130 and the fourth throttling device 140, and the fourth throttling device 140 is opened by closing the second throttling device 120, so that the situation that the refrigerant cannot flow in the first heat exchanger group 40 due to the low pressure of the refrigerant in the first heat exchanger group 40 can be prevented.
Referring to fig. 6, when the second heat exchanger group 50 defrosts, the second four-way valve 22 is powered off, the first four-way valve 21 and the adjusting four-way valve are powered on, the second throttling device 120 is opened to a set opening degree, the third throttling device 130 is closed, the fourth throttling device 140 is opened to a set opening degree, at this time, the C connection pipe and the S connection pipe of the first four-way valve 21 are communicated, the C connection pipe and the D connection pipe of the second four-way valve 22 are communicated, and the D connection pipe and the E connection pipe of the adjusting four-way valve are communicated.
A part of the high-temperature and high-pressure gas refrigerant discharged through the discharge port of the compressor 10 flows into the indoor heat exchanger 81 through the four-way valve and the air pipe 60, is changed into a high-pressure supercooled liquid refrigerant after releasing heat in the indoor heat exchanger 81, and finally flows to the second throttling device 120 through the liquid pipe 70; the other part of the refrigerant flows into the second heat exchanger group 50 through the second four-way valve 22, releases heat in the second heat exchanger group 50 to become a high-pressure supercooled liquid refrigerant, and finally flows to the fourth throttling device 140, the high-pressure supercooled liquid refrigerant is throttled by the second throttling device 120 and the fourth throttling device 140 to become a low-temperature low-pressure gas-liquid two-phase refrigerant, absorbs heat in the first heat exchanger group 40 to become a low-temperature low-pressure gas refrigerant, and finally flows back to the suction port of the compressor 10 through the first four-way valve 21 to complete circulation.
It should be noted that the high-pressure supercooled liquid refrigerant generates pressure drop after being throttled by the second throttling device 120 and the fourth throttling device 140, and the fourth throttling device 140 is opened by closing the third throttling device 130, so that the situation that the refrigerant cannot flow in the second heat exchanger group 50 due to the low pressure of the refrigerant in the second heat exchanger group 50 can be prevented.
Further, a gas-liquid separator 150 is connected in series to the suction port of the compressor 10 to separate liquid flowing to the suction port and prevent liquid hammering.
In a possible embodiment, the first heat exchanger group 40 comprises one heat exchanger.
In an alternative embodiment, the first heat exchanger bank 40 includes a plurality of heat exchangers.
Furthermore, a plurality of heat exchangers are arranged in parallel, and each heat exchanger is correspondingly provided with an electric control valve, so that the heat exchangers with corresponding quantity can be opened as required, the control is convenient, and various requirements can be met.
Alternatively, a plurality of heat exchangers may be arranged in series.
In a possible embodiment, the second heat exchanger group 50 comprises one heat exchanger.
In an alternative embodiment, the second heat exchanger set 50 includes a plurality of heat exchangers.
Furthermore, a plurality of heat exchangers are arranged in parallel, and each heat exchanger is correspondingly provided with an electric control valve, so that the heat exchangers with corresponding quantity can be opened as required, the control is convenient, and various requirements can be met.
Alternatively, a plurality of heat exchangers may be arranged in series.
Example 3
Referring now to fig. 7-10, an alternative embodiment of the air conditioning system described above will be described. Fig. 7 is a schematic structural view of an air conditioning system during refrigeration according to a second embodiment of the present invention; fig. 8 is a schematic structural view of an air conditioning system for heating according to a second embodiment of the present invention; fig. 9 is a schematic structural view illustrating a defrosting operation of the first heat exchanger group 40 of the air conditioning system according to the second embodiment of the present invention; fig. 10 is a schematic structural view illustrating a defrosting operation of the second heat exchanger group 50 of the air conditioning system according to the second embodiment of the present invention.
The present embodiment differs from embodiment 2 in that the first direction changing device 20 includes a first electronic control valve 23, a second electronic control valve 24, a third electronic control valve 25, and a fourth electronic control valve 26.
The first electric control valve 23 is connected between the exhaust port of the compressor 10 and the first heat exchanger group 40, the second electric control valve 24 is connected between the suction port of the compressor 10 and the first heat exchanger group 40, the third electric control valve 25 is connected between the exhaust port of the compressor 10 and the second heat exchanger group 50, and the fourth electric control valve 26 is connected between the suction port of the compressor 10 and the second heat exchanger group 50.
Referring to fig. 7 (the direction of the arrow in the figure is the refrigerant flow direction), during cooling, the first electronic control valve 23 and the third electronic control valve 25 are turned on, the second electronic control valve 24 and the fourth electronic control valve 26 are turned off, the second throttling device 120 and the third throttling device 130 are opened to a set opening degree, and the fourth throttling device 140 is turned off. And adjusting the power failure of the electric control valve, and communicating an S connecting pipe and an E connecting pipe of the four-way valve.
The high-temperature and high-pressure gas refrigerant discharged from the air outlet of the compressor 10 flows into the first heat exchanger group 40 and the second heat exchanger group 50 through the first electric control valve 23 and the third electric control valve 25, is changed into a high-pressure supercooled liquid refrigerant after releasing heat in the first heat exchanger group 40 and the second heat exchanger group 50, is changed into a low-temperature and low-pressure gas-liquid two-phase refrigerant after being throttled by the throttling device of the indoor unit, is changed into a low-temperature and low-pressure refrigerant gas after absorbing heat in the indoor heat exchanger 81, and finally flows back to the air suction port of the compressor 10 through the air pipe 60 to complete the cycle.
Referring to fig. 8 (the direction of the arrow in the figure is the direction of the refrigerant flow), during heating, the first electronic control valve 23 and the third electronic control valve 25 are turned off, the second electronic control valve 24 and the fourth electronic control valve 26 are turned on, the second throttling device 120 and the third throttling device 130 are opened to a set opening degree, and the fourth throttling device 140 is closed. And the four-way valve is adjusted to be electrified, and a D connecting pipe and an E connecting pipe of the four-way valve are adjusted to be communicated.
The high-temperature and high-pressure gas refrigerant discharged from the exhaust port of the compressor 10 flows into the indoor heat exchanger 81 through the four-way valve and the air pipe 60, and turns into a high-pressure supercooled liquid refrigerant after releasing heat in the indoor heat exchanger 81, and finally flows to the second throttling device 120 and the third throttling device 130 through the liquid pipe 70, and turns into a low-temperature and low-pressure gas-liquid two-phase refrigerant after being throttled by the second throttling device 120 and the third throttling device 130, and the gas-liquid two-phase refrigerant absorbs heat in the first heat exchanger group 40 and the second heat exchanger group 50 and turns into a low-temperature and low-pressure gas, and finally flows back to the suction port of the compressor 10 through the second electric control valve 24 and the fourth electric control valve 26, thereby completing the cycle.
Referring to fig. 9 (the direction of the arrow in the figure is the refrigerant flow direction), when the first heat exchanger group 40 defrosts, the second electric control valve 24 and the third electric control valve 25 are turned off, the first electric control valve 23 and the fourth electric control valve 26 are turned on, the second throttling device 120 is turned off, the third throttling device 130 is opened to a set opening degree, and the fourth throttling device 140 is opened to a set opening degree. And the four-way valve is adjusted to be electrified, and a D connecting pipe and an E connecting pipe of the four-way valve are adjusted to be communicated.
A part of the high-temperature and high-pressure gas refrigerant discharged through the discharge port of the compressor 10 flows into the indoor heat exchanger 81 through the four-way valve and the air pipe 60, is changed into a high-pressure supercooled liquid refrigerant after releasing heat in the indoor heat exchanger 81, and finally flows to the third throttling device 130 through the liquid pipe 70; the other part of the refrigerant flows into the first heat exchanger group 40 through the first electric control valve 23, releases heat in the first heat exchanger group 40, becomes a high-pressure supercooled liquid refrigerant, and finally flows to the fourth throttling device 140, the high-pressure supercooled liquid refrigerant becomes a low-temperature low-pressure gas-liquid two-phase refrigerant after being throttled by the third throttling device 130 and the fourth throttling device 140, becomes a low-temperature low-pressure gas refrigerant after absorbing heat in the second heat exchanger group 50, and finally flows back to the suction port of the compressor 10 through the fourth electric control valve 26, and the circulation is completed.
Referring to fig. 10 (the direction of the arrow in the drawing is the refrigerant flow direction), when the second heat exchanger group 50 defrosts, the first electric control valve 23 and the fourth electric control valve 26 are turned off, the second electric control valve 24 and the third electric control valve 25 are turned on, the second throttling device 120 is opened to a set opening degree, the third throttling device 130 is closed, and the fourth throttling device 140 is opened to a set opening degree. And the four-way valve is adjusted to be electrified, and a D connecting pipe and an E connecting pipe of the four-way valve are adjusted to be communicated.
A part of the high-temperature and high-pressure gas refrigerant discharged through the discharge port of the compressor 10 flows into the indoor heat exchanger 81 through the four-way valve and the air pipe 60, is changed into a high-pressure supercooled liquid refrigerant after releasing heat in the indoor heat exchanger 81, and finally flows to the second throttling device 120 through the liquid pipe 70; the other part of the refrigerant flows into the second heat exchanger group 50 through the third electric control valve 25, releases heat in the second heat exchanger group 50 to become a high-pressure supercooled liquid refrigerant, and finally flows to the fourth throttling device 140, the high-pressure supercooled liquid refrigerant is throttled by the second throttling device 120 and the fourth throttling device 140 to become a low-temperature low-pressure gas-liquid two-phase refrigerant, absorbs heat in the first heat exchanger group 40 to become a low-temperature low-pressure gas refrigerant, and finally flows back to the suction port of the compressor 10 through the second electric control valve 24 to complete the circulation.
The first electric control valve 23, the second electric control valve 24, the third electric control valve 25 and the fourth electric control valve 26 are one or a combination of an electromagnetic valve and an electric control stop valve.
Although various specific examples of the first, second, third and fourth electrically controlled valves 23, 24, 25 and 26 are illustrated, the scope of the present invention is not limited to these specific configurations, and those skilled in the art can select other valve configurations as needed to achieve the on/off of the pipeline.
Wherein one or more of the first throttling device 90, the second throttling device 120, the third throttling device 130 and the fourth throttling device 140 is an electronic expansion valve or other valve with controllable opening degree.
Although various specific examples of the first throttling device 90, the second throttling device 120, the third throttling device 130 and the fourth throttling device 140 are listed above, the scope of the present invention is not limited to these specific structures, and those skilled in the art can select other valve structures as needed, provided that the on/off of the pipeline can be realized. For example, in a fixed frequency system or a simpler system, the fourth throttle device 140 may also be replaced with a capillary tube or a thermostatic expansion valve.
Example 4
The present embodiment is different from embodiment 2 or embodiment 3 in that the air conditioning system further includes: a low pressure gas pipe (not shown in the figure) communicating with the suction port; the indoor unit comprises a valve box and an indoor heat exchanger 81 connected with the valve box, and an air pipe 60, a liquid pipe 70 and a low-pressure air pipe are communicated with the valve box.
In this scheme, indoor set includes indoor heat exchanger 81 and valve box, through setting up valve box and low-pressure trachea, can realize the function that air conditioning system refrigerates simultaneously and heats.
The valve box can adjust the passage of the refrigerant and the flow direction of the refrigerant, and can further cool or heat the indoor heat exchanger 81. Since the structures of the low-pressure air pipe and the valve box are the prior art, the detailed structure of the valve box is not described herein.
It should be further noted that, through the above embodiments 2 to 4, the air conditioning system realizes the unification of the two-pipe multi-split air conditioning system and the three-pipe multi-split air conditioning system, which is convenient for both production and maintenance.
The various component embodiments of the invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art will appreciate that a microprocessor or Digital Signal Processor (DSP) may be used in practice to implement some or all of the functionality of some or all of the components in a server, client, or the like, according to embodiments of the present invention. The present invention may also be embodied as an apparatus or device program (e.g., PC program and PC program product) for carrying out a portion or all of the methods described herein. Such a program implementing the invention may be stored on a PC readable medium or may be in the form of one or more signals. Such a signal may be downloaded from an internet website or provided on a carrier signal or in any other form.
Although the foregoing embodiments describe the steps in the above sequential order, those skilled in the art will understand that, in order to achieve the effect of the present embodiments, the steps may not be executed in such an order, and may be executed simultaneously (in parallel) or in an inverse order, and these simple variations are within the scope of the present invention.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims of the present invention, any of the claimed embodiments may be used in any combination.
It should be noted that although the detailed steps of the method of the present invention have been described in detail, those skilled in the art can combine, separate and change the order of the above steps without departing from the basic principle of the present invention, and the modified technical solution does not change the basic concept of the present invention and thus falls into the protection scope of the present invention.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.

Claims (10)

1. The control method of the air conditioning system is characterized in that the air conditioning system comprises a compressor, a first reversing device, a second reversing device, a first heat exchanger group, a second heat exchanger group, an air pipe, a liquid pipe, an indoor unit and a first throttling device;
the air outlet of the compressor is communicated with the first reversing device and the second reversing device at the same time, and the air suction port of the compressor is communicated with the first reversing device and the second reversing device at the same time;
two ends of the air pipe are respectively communicated with the second reversing device and the indoor unit;
one end of the first heat exchanger group is communicated with the first reversing device, and the other end of the first heat exchanger group is communicated with the indoor unit through the liquid pipe;
one end of the second heat exchanger group is communicated with the first reversing device, and the other end of the second heat exchanger group is communicated with the indoor unit through the liquid pipe;
the first throttling device is arranged between the first reversing device and the exhaust port and is used for adjusting the flow of the refrigerant flowing into the first reversing device;
the first and second commutation devices are configured to:
when the first heat exchanger group defrosts, the air pipe and the first heat exchanger group are communicated with the air outlet, and the second heat exchanger group is communicated with the air suction port;
when the second heat exchanger group defrosts, the air pipe and the second heat exchanger group are communicated with the air outlet, and the first heat exchanger group is communicated with the air suction port;
during refrigeration, the first heat exchanger group and the second heat exchanger group are communicated with the exhaust port, and the air pipe is communicated with the air suction port;
when heating, the first heat exchanger group and the second heat exchanger group are communicated with the air suction port, and the air pipe is communicated with the air exhaust port;
the control method comprises the following steps:
determining an operating mode of the air conditioning system, wherein the operating mode comprises a cooling mode, a heating mode, a first heat exchanger group defrosting mode and a second heat exchanger group defrosting mode;
and when the working mode is the first heat exchanger group defrosting mode or the second heat exchanger group defrosting mode, adjusting the opening degree of the first throttling device according to a preset condition.
2. The control method according to claim 1, wherein the air conditioning system further includes a first pressure sensor, the first pressure sensor is disposed between the first throttling device and the first reversing device, and the adjusting the first throttling device according to a preset condition specifically includes:
determining a target condensing pressure;
acquiring the real-time pressure of a refrigerant flowing into the first reversing device;
and comparing the condensing pressure with the real-time pressure, and adjusting the opening of the first throttling device according to the comparison result.
3. The control method according to claim 2, wherein the air conditioning system further includes a second pressure sensor disposed at the air outlet, the second pressure sensor being configured to detect a refrigerant pressure at the air outlet, and the determining the target condensing pressure specifically includes:
acquiring the exhaust pressure at the exhaust port;
determining the target condensing pressure according to the exhaust pressure.
4. The control method according to claim 2, wherein the adjusting the opening degree of the first throttle device according to the comparison result specifically includes:
when the real-time pressure is smaller than the condensing pressure, the opening degree of the first throttling device is increased;
and when the real-time pressure is greater than the condensing pressure, reducing the opening degree of the first throttling device.
5. The control method according to claim 2, wherein the air conditioning system further includes a second throttling device, a third throttling device, and a fourth throttling device;
the second throttling device is arranged between the first heat exchanger group and the liquid pipe;
the third throttling device is arranged between the second heat exchanger group and the liquid pipe;
one end of the fourth throttling device is connected between the first heat exchanger group and the second throttling device, and the other end of the fourth throttling device is connected between the second heat exchanger group and the third throttling device;
the control method further comprises the following steps:
when the working mode is the defrosting mode of the first heat exchanger group, the second throttling device is closed, and the fourth throttling device is opened;
when the working mode is a second heat exchanger group defrosting mode, the third throttling device is closed, and the fourth throttling device is opened;
and when the working mode is a cooling mode or a heating mode, closing the fourth throttling device, and opening the second throttling device and the third throttling device.
6. An air conditioning system, comprising:
the air conditioner comprises a compressor, a first reversing device, a second reversing device, a first heat exchanger group, a second heat exchanger group, an air pipe, a liquid pipe, an indoor unit, a first throttling device and a controller;
the air outlet of the compressor is communicated with the first reversing device and the second reversing device at the same time, and the air suction port of the compressor is communicated with the first reversing device and the second reversing device at the same time;
two ends of the air pipe are respectively communicated with the second reversing device and the indoor unit;
one end of the first heat exchanger group is communicated with the first reversing device, and the other end of the first heat exchanger group is communicated with the indoor unit through the liquid pipe;
one end of the second heat exchanger group is communicated with the first reversing device, and the other end of the second heat exchanger group is communicated with the indoor unit through the liquid pipe;
the first throttling device is arranged between the first reversing device and the exhaust port and is used for adjusting the flow of the refrigerant flowing into the first reversing device;
the first and second commutation devices are configured to:
when the first heat exchanger group defrosts, the first heat exchanger group is communicated with the air outlet, and the second heat exchanger group is communicated with the air suction port;
when the second heat exchanger group defrosts, the second heat exchanger group is communicated with the exhaust port, and the first heat exchanger group is communicated with the suction port;
during refrigeration, the first heat exchanger group and the second heat exchanger group are communicated with the exhaust port, and the air pipe is communicated with the air suction port;
when heating, the first heat exchanger group and the second heat exchanger group are communicated with the air suction port, and the air pipe is communicated with the air exhaust port;
the controller is communicatively coupled to the first throttling device.
7. The air conditioning system of claim 6, further comprising:
the first pressure sensor is arranged between the first throttling device and the first reversing device, and the first pressure sensor is in communication connection with the controller.
8. The air conditioning system of claim 7, further comprising:
and the second pressure sensor is arranged at the air outlet and is in communication connection with the controller and used for detecting the pressure of the refrigerant at the air outlet.
9. The air conditioning system of claim 7, further comprising:
a second throttling device, a third throttling device and a fourth throttling device all in communication connection with the controller;
the second throttling device is arranged between the first heat exchanger group and the liquid pipe;
the third throttling device is arranged between the second heat exchanger group and the liquid pipe;
one end of the fourth throttling device is connected between the first heat exchanger group and the second throttling device, and the other end of the fourth throttling device is connected between the second heat exchanger group and the third throttling device.
10. The air conditioning system according to any one of claims 6 to 9, further comprising:
the low-pressure air pipe is communicated with the air suction port;
the indoor unit comprises a valve box and an indoor heat exchanger connected with the valve box, and the air pipe, the liquid pipe and the low-pressure air pipe are communicated with the valve box.
CN202010365280.1A 2020-04-30 2020-04-30 Control method of air conditioning system and air conditioning system Pending CN113669843A (en)

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PCT/CN2021/078566 WO2021218350A1 (en) 2020-04-30 2021-03-02 Air conditioning system control method and air conditioning system

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