CN107559953B - Multi-split air conditioning system and control method and device of supercooling loop valve body thereof - Google Patents
Multi-split air conditioning system and control method and device of supercooling loop valve body thereof Download PDFInfo
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- CN107559953B CN107559953B CN201710697630.2A CN201710697630A CN107559953B CN 107559953 B CN107559953 B CN 107559953B CN 201710697630 A CN201710697630 A CN 201710697630A CN 107559953 B CN107559953 B CN 107559953B
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Abstract
The invention discloses a multi-split system and a control method and a device of a supercooling loop valve body of the multi-split system, wherein the control method comprises the following steps of: when the multi-split system operates in a pure refrigeration mode or a mixed refrigeration and heating mode, acquiring the outlet superheat degree of a second heat exchange flow path of the first heat exchanger, and adjusting the opening degree of a supercooling loop valve body according to the outlet superheat degree and the current target outlet superheat degree; judging whether an indoor unit in the plurality of indoor units has insufficient refrigerant; if the indoor units in the indoor units have insufficient refrigerant, the current target outlet superheat degree is increased, and the opening degree of the supercooling loop valve body is adjusted according to the adjusted target outlet superheat degree and the adjusted outlet superheat degree, so that the problems of insufficient refrigerant, bias flow, liquid return and the like of the refrigerating indoor units can be avoided on the premise of realizing supercooling.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method of a supercooling loop valve body in a multi-split system, a control device of the supercooling loop valve body in the multi-split system and the multi-split system with the control device.
Background
Generally, a flow dividing device of a multi-split system is arranged on a liquid pipe, and a supercooling valve on a supercooling flow path is controlled by superheat degree to realize supercooling of a main refrigerant.
In practical applications, in order to save installation cost, more and more indoor units can be connected by the flow dividing device, that is, the capacity of the flow dividing device is larger and larger, that is, the range of the selection of the supercooling valve is wider, when the flow dividing device with large capacity is connected with fewer indoor units or the system is operated only under partial load, if the opening degree of the supercooling valve is too large, the refrigerant shortage or bias flow (that is, the refrigerant shortage of part of the indoor units) of the refrigeration indoor unit is easily caused. In addition, the larger supercooling valve is easy to return refrigerant when the opening degree is large and the load is small.
Disclosure of Invention
The present invention is directed to solving at least one of the problems in the art to some extent.
Therefore, a first object of the present invention is to provide a method for controlling a valve body of a subcooling circuit in a multi-split air-conditioning system, which can avoid the problems of insufficient refrigerant or bias flow of the indoor unit of a refrigeration system, or liquid return and the like caused by the connection of a large-capacity flow divider to fewer indoor units or the operation of only a partial load in the system on the premise of implementing subcooling.
A second object of the invention is to propose a computer-readable storage medium.
The third purpose of the invention is to provide a control device of a supercooling loop valve body in a multi-split system.
A fourth object of the present invention is to provide a multi-split system.
In order to achieve the above object, a first embodiment of the present invention provides a method for controlling a subcooling circuit valve in a multi-split air-conditioning system, where the multi-split air-conditioning system includes an outdoor unit, a plurality of indoor units, and a flow dividing device, where the flow dividing device includes a first heat exchanger, an inlet of a first heat exchange flow path of the first heat exchanger is connected to a high-pressure liquid pipe of the outdoor unit, an outlet of the first heat exchange flow path of the first heat exchanger is connected to each of the indoor units, an inlet of a second heat exchange flow path of the first heat exchanger is connected to an outlet of the first heat exchange flow path of the first heat exchanger through the subcooling circuit valve, and an outlet of the second heat exchange flow path of the first heat exchanger is connected to a low-pressure liquid pipe of the outdoor unit, and the method includes the following steps: when the multi-split air conditioning system operates in a pure refrigeration mode or a mixed refrigeration and heating mode, acquiring the outlet superheat degree of a second heat exchange flow path of the first heat exchanger, and adjusting the opening degree of a valve body of the supercooling circuit according to the outlet superheat degree and the current target outlet superheat degree; judging whether an indoor unit in the plurality of indoor units has insufficient refrigerant; and if the indoor units in the plurality of indoor units have insufficient refrigerant, adjusting the current target outlet superheat degree to be high, and adjusting the opening degree of the supercooling loop valve body according to the adjusted target outlet superheat degree and the outlet superheat degree.
According to the control method of the supercooling circuit valve body in the multi-split system, when the multi-split system operates in a pure refrigeration mode or a mixed refrigeration and heating mode, firstly, the outlet superheat degree of the second heat exchange flow path of the first heat exchanger is obtained, the opening degree of the supercooling circuit valve body is adjusted according to the outlet superheat degree and the current target outlet superheat degree, then whether the indoor units in the indoor units are insufficient in refrigerant is judged, if yes, the current target outlet superheat degree is increased, and the opening degree of the supercooling circuit valve body is adjusted according to the adjusted target outlet superheat degree and the adjusted outlet superheat degree. The method can avoid the problems of insufficient refrigerant or bias flow of the indoor unit of the refrigeration, liquid return and the like caused by the fact that a large-capacity flow dividing device is connected with fewer indoor units or only part of the load in the system runs on the premise of realizing supercooling.
In addition, the control method of the supercooling circuit valve body in the multi-split system according to the above embodiment of the present invention may further have the following additional technical features:
according to one embodiment of the present invention, if there is no refrigerant shortage in any of the indoor units, the current target outlet superheat degree is controlled to be maintained.
According to one embodiment of the present invention, if there is an indoor unit return liquid in the plurality of indoor units and the opening degree of the throttling element of the indoor unit reaches a preset minimum allowable opening degree, the current target outlet superheat degree is adjusted to be low.
According to an embodiment of the present invention, the adjusting the opening degree of the subcooling circuit valve body on the basis of the outlet superheat degree and a current target outlet superheat degree includes: if the outlet superheat degree is larger than the current target outlet superheat degree, the opening degree of the supercooling circuit valve body is increased; and if the outlet superheat degree is less than the current target outlet superheat degree, adjusting the opening degree of the supercooling circuit valve body to be small.
According to an embodiment of the present invention, the method for controlling a subcooling circuit valve body in a multiple split air conditioning system further includes: acquiring the total load of refrigerating indoor units in the indoor units and the capacity of the shunting device; and acquiring the maximum allowable opening degree of the supercooling circuit valve body according to the ratio of the total load of the refrigeration indoor unit to the capacity of the flow dividing device, and enabling the opening degree of the supercooling circuit valve body to be smaller than or equal to the maximum allowable opening degree, wherein the maximum allowable opening degree and the ratio are in positive correlation.
In order to achieve the above object, a second embodiment of the present invention provides a computer-readable storage medium having instructions stored therein, wherein when the instructions are executed, the flow dividing device executes the control method of the subcooling circuit valve body in the multi-split system.
According to the computer-readable storage medium of the embodiment of the invention, by executing the control method of the supercooling loop valve body in the multi-split system, the problems of insufficient refrigerant or bias flow of the indoor unit of the refrigeration system or liquid return and the like caused by the fact that a large-capacity flow dividing device is connected with fewer indoor units or only part of the load in the system runs can be avoided on the premise of realizing supercooling.
In order to achieve the above object, a third embodiment of the present invention provides a control device for a supercooling circuit valve body in a multi-split system, where the multi-split system includes an outdoor unit, a plurality of indoor units, and a flow dividing device, the flow dividing device includes a first heat exchanger, an inlet of a first heat exchange flow path of the first heat exchanger is connected to a high pressure liquid pipe of the outdoor unit, an outlet of the first heat exchange flow path of the first heat exchanger is connected to each of the plurality of indoor units, an inlet of a second heat exchange flow path of the first heat exchanger is connected to an outlet of the first heat exchange flow path of the first heat exchanger through the supercooling circuit valve body, and an outlet of the second heat exchange flow path of the first heat exchanger is connected to a low pressure liquid pipe of the outdoor unit, the control device includes: the first obtaining module is used for obtaining the superheat degree of an outlet of a second heat exchange flow path of the first heat exchanger when the multi-split air conditioning system operates in a pure cooling mode or a mixed cooling and heating mode; the control module is used for adjusting the opening of the supercooling circuit valve body according to the outlet superheat degree and the current target outlet superheat degree; the judging module is used for judging whether the indoor units in the plurality of indoor units have insufficient refrigerants; the control module is further used for increasing the current target outlet superheat degree when the indoor units in the indoor units have insufficient refrigerants, and adjusting the opening degree of the supercooling loop valve body according to the adjusted target outlet superheat degree and the outlet superheat degree.
According to the control device of the supercooling circuit valve body in the multi-split system, when the multi-split system operates in a pure refrigeration mode or a mixed refrigeration and heating mode, firstly, the outlet superheat degree of the second heat exchange flow path of the first heat exchanger is obtained through the first obtaining module, and the opening degree of the supercooling circuit valve body is adjusted through the control module according to the outlet superheat degree and the current target outlet superheat degree. And then, judging whether an indoor unit in the indoor units has insufficient refrigerant through a judging module, and when the indoor unit in the indoor units has insufficient refrigerant, increasing the current target outlet superheat degree through a control module, and adjusting the opening degree of the supercooling loop valve body according to the adjusted target outlet superheat degree and the adjusted outlet superheat degree. The device can avoid the problems of insufficient refrigerant or bias flow of the indoor machine of the refrigeration, liquid return and the like caused by the fact that a large-capacity flow dividing device is connected with fewer indoor machines or only part of the load in a system runs on the premise of realizing supercooling.
In addition, the control device for the valve body of the supercooling circuit in the multi-split system according to the above embodiment of the invention may further have the following additional technical features:
according to an embodiment of the present invention, if there is no refrigerant shortage in any of the indoor units, the control module controls the current target outlet superheat degree to be maintained.
According to one embodiment of the invention, the control module is used for adjusting the current target outlet superheat degree to be low if liquid returning of the indoor unit exists in the indoor units and the opening degree of the throttling element of the indoor unit reaches a preset minimum allowable opening degree.
According to one embodiment of the invention, when the control module adjusts the opening degree of the subcooling circuit valve body according to the outlet superheat degree and a current target outlet superheat degree, wherein if the outlet superheat degree is greater than the current target outlet superheat degree, the control module increases the opening degree of the subcooling circuit valve body; and if the outlet superheat degree is smaller than the current target outlet superheat degree, the control module adjusts the opening degree of the supercooling circuit valve body to be small.
According to an embodiment of the present invention, the control device for a subcooling circuit valve body in a multiple split air conditioning system further includes: the second acquisition module is used for acquiring the total load of the refrigerating indoor units in the indoor units and the capacity of the shunting device; the control module is further configured to obtain a maximum allowable opening degree of the supercooling circuit valve body according to a ratio of a total load of the refrigeration indoor unit to a capacity of the flow dividing device, and enable the opening degree of the supercooling circuit valve body to be smaller than or equal to the maximum allowable opening degree, where the maximum allowable opening degree and the ratio are in a positive correlation.
In order to achieve the above object, a fourth aspect of the present invention provides a multi-split system, which includes the above control device for the valve body of the subcooling circuit in the multi-split system.
According to the multi-split system provided by the embodiment of the invention, on the premise of realizing supercooling, the problems of insufficient refrigerant or bias flow of the indoor unit of the refrigeration system, liquid return and the like caused by the fact that a large-capacity flow dividing device is connected with fewer indoor units or only part of load operation in the system can be avoided through the control device of the supercooling loop valve body in the multi-split system.
Drawings
Fig. 1 is a schematic configuration diagram of a multi-split system according to an embodiment of the present invention;
fig. 2 is a refrigerant flow diagram of a multi-split system in a pure cooling mode according to an embodiment of the present invention;
fig. 3 is a refrigerant flow diagram of a multi-split system according to an embodiment of the present invention in a main cooling mode or a main heating mode;
fig. 4 is a flowchart of a control method of a supercooling circuit valve body in a multi-split system according to an embodiment of the present invention;
fig. 5 is a schematic diagram of the ratio of the total load of the refrigeration indoor units to the capacity of the flow dividing device versus the maximum opening of the subcooling circuit valve body according to one embodiment of the present invention;
fig. 6 is a block schematic diagram of a control device of a supercooling circuit valve body in a multi-split system according to an embodiment of the invention; and
fig. 7 is a block diagram illustrating a control device for a valve body of a supercooling circuit in a multi-split system according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A control method of a subcooling circuit valve body in a multi-split system, a computer-readable storage medium, a control device of a subcooling circuit valve body in a multi-split system, and a multi-split system having the control device according to an embodiment of the present invention will be described below with reference to the accompanying drawings.
In an embodiment of the present invention, the multi-split system includes an outdoor unit, a plurality of indoor units, and a flow dividing device, where the flow dividing device includes a first heat exchanger, an inlet of a first heat exchange flow path of the first heat exchanger is connected to a high pressure liquid pipe of the outdoor unit, an outlet of the first heat exchange flow path of the first heat exchanger is connected to each of the plurality of indoor units, an inlet of a second heat exchange flow path of the first heat exchanger is connected to an outlet of the first heat exchange flow path of the first heat exchanger through a supercooling circuit valve body, and an outlet of the second heat exchange flow path of the first heat exchanger is connected to a low pressure gas pipe of the outdoor unit.
Specifically, as shown in fig. 1, the multi-split system may include an outdoor unit 10, a plurality of indoor units 20, and a flow dividing device 30. The outdoor unit 10 may include a first outdoor heat exchanger 11, a second outdoor heat exchanger 12, a compressor 13, an outdoor air-liquid separator 14, a first four-way valve ST1, a second four-way valve ST2, a third four-way valve ST3, a first outdoor throttling element EXVA, and a second outdoor throttling element EXVB. Wherein, the exhaust port of the compressor 13 is connected to one end of the first outdoor heat exchanger 11 through the first four-way valve ST1, and the other end of the first outdoor heat exchanger 11 is connected to the high pressure liquid pipe through the first outdoor throttling element EXVA; an exhaust port of the compressor 13 is connected to one end of the second outdoor heat exchanger 12 through a second four-way valve ST2, and the other end of the second outdoor heat exchanger 12 is connected to a high pressure liquid pipe through a second outdoor throttling element EXVB; the discharge port of the compressor 13 is connected to the high-pressure gas pipe through a third four-way valve ST 3. The return port of the compressor 13 is connected to one end of the outdoor-air-liquid separator 14, and the other end of the outdoor-air-liquid separator 14 is connected to the first four-way valve ST1, the second four-way valve ST2, the third four-way valve ST3, and the low-pressure gas pipe, respectively.
The plurality of indoor units 20 may include first to fourth indoor units. The first indoor unit comprises a first indoor heat exchanger 21 and a first indoor throttling element EXV1, the second indoor unit comprises a second indoor heat exchanger 22 and a second indoor throttling element EXV2, the third indoor unit comprises a third indoor heat exchanger 23 and a third indoor throttling element EXV3, and the fourth indoor unit comprises a fourth indoor heat exchanger 24 and a fourth indoor throttling element EXV 4.
The flow dividing device 30 may include a first heat exchanger 31, a subcooling circuit valve body EV, a plurality of heating check valves 311, 312, 313, and 314, a plurality of cooling check valves 321, 322, 323, and 324, a plurality of heating on-off valves 331, 332, 333, and 334, and a plurality of cooling on-off valves 341, 342, 343, and 344. An inlet of a first heat exchange flow path of the first heat exchanger 31 is connected to a high pressure liquid pipe of the outdoor unit 10, an outlet of the first heat exchange flow path of the first heat exchanger 31 is connected to each of the indoor units 20, an inlet of a second heat exchange flow path of the first heat exchanger 31 is connected to an outlet of the first heat exchange flow path of the first heat exchanger 31 through the supercooling circuit valve EV, and an outlet of the second heat exchange flow path of the first heat exchanger 31 is connected to a low pressure liquid pipe of the outdoor unit 10. The first heat exchange flow path of the first heat exchanger 31 is a main path of the flow dividing device 30, and the second heat exchange flow path of the first heat exchanger 31 is a sub-cooling loop of the flow dividing device 30. The subcooling circuit valve body EV may be an electronic expansion valve and the first heat exchanger 31 may be a plate heat exchanger.
One ends of the first indoor heat exchanger 21, the second indoor heat exchanger 22, the third indoor heat exchanger 23 and the fourth indoor heat exchanger 24 are respectively connected with the high pressure air pipe through a plurality of corresponding heating on-off valves 331, 332, 333 and 334, one ends of the first indoor heat exchanger 21, the second indoor heat exchanger 22, the third indoor heat exchanger 23 and the fourth indoor heat exchanger 24 are also respectively connected with the low pressure air pipe through a plurality of corresponding cooling on-off valves 341, 342, 343 and 344, the other ends of the first indoor heat exchanger 21, the second indoor heat exchanger 22, the third indoor heat exchanger 23 and the fourth indoor heat exchanger 24 are respectively connected with one ends of a corresponding first indoor throttling element EXV1, a corresponding second indoor throttling element EXV2, a corresponding third indoor throttling element EXV3 and a corresponding fourth indoor throttling element EXV4, the other ends of the first indoor throttling element EXV1, the second indoor throttling element EXV2, the third indoor throttling element EXV3 and the fourth indoor throttling element EXV4 are respectively connected with a plurality of corresponding one-way heating on-off valves 331, 332, 333, 334 and one-way check valves, 312. 313 and 314 are connected to a high pressure liquid pipe, and the other ends of the first indoor throttling element EXV1, the second indoor throttling element EXV2, the third indoor throttling element EXV3 and the fourth indoor throttling element EXV4 are further connected to the outlet of the first heat exchange flow path of the first heat exchanger 31 through a plurality of refrigeration check valves 321, 322, 323 and 324, respectively.
When the multi-split system is operated in the pure cooling mode, as shown in fig. 2, the discharge port of the compressor 13 is directly communicated through the first and second outdoor heat exchangers 11 and 12 by the first and second four-way valves ST1 and ST2, respectively. Wherein the first outdoor heat exchanger 11 and the second outdoor heat exchanger 12 both function as condensers. At this time, the high-temperature and high-pressure gaseous refrigerant discharged from the discharge port of the compressor 13 is divided into two paths: one path of refrigerant flows to the first outdoor heat exchanger 11 after passing through the first four-way valve ST1, is condensed to release heat and then is changed into a high-temperature and high-pressure liquid refrigerant, and enters a high-pressure liquid pipe after being throttled by the first outdoor throttling element EXVA; the other path of the refrigerant flows to the second outdoor heat exchanger 12 after passing through the second four-way valve ST2, is condensed and released heat to become a high-temperature and high-pressure liquid refrigerant, and enters a high-pressure liquid pipe after being throttled by the second outdoor throttling element EXVB. After the two paths of refrigerants are converged, one part of the refrigerant passes through a first heat exchange flow path of the first heat exchanger 31, is distributed to corresponding first to fourth indoor units through a plurality of refrigeration check valves 321, 322, 323 and 324, enters the first to fourth indoor heat exchangers through throttling elements of the first to fourth indoor units, is evaporated and absorbs heat to form medium-temperature low-pressure gaseous refrigerant, and the medium-temperature low-pressure gaseous refrigerant of the first to fourth indoor units is converged in a low-pressure air pipe through a plurality of refrigeration on-off valves 341, 342, 343 and 344 corresponding to the first to fourth indoor units; and the other part enters a second heat exchange flow path after being throttled by the supercooling loop valve body EV, and the second heat exchange flow path absorbs the heat of the refrigerant in the first heat exchange flow path, then the refrigerant is changed into a low-pressure gaseous refrigerant and enters a low-pressure air pipe. The refrigerant in the low-pressure gas pipe flows back to the return port of the compressor 13 through the outdoor gas-liquid separator 14.
When the multi-split air conditioning system operates in a hybrid cooling and heating mode (including a main heating mode or a main cooling mode), as shown in fig. 3, it is assumed that the first outdoor heat exchanger 11 is an evaporator, the second outdoor heat exchanger 12 is a condenser, the first indoor unit and the fourth indoor unit are cooling indoor units, and the second indoor unit and the third indoor unit are heating indoor units. At this time, the high-temperature and high-pressure gaseous refrigerant discharged from the discharge port of the compressor 13 is divided into two paths: one path of refrigerant flows to the second outdoor heat exchanger 12 after passing through the second four-way valve ST2, is condensed and released heat to become high-temperature and high-pressure liquid refrigerant, and enters a high-pressure liquid pipe after being throttled by the second outdoor throttling element EXVB; the other path of the refrigerant passes through a third four-way valve ST3 and heating on-off valves 332 and 333 respectively corresponding to the second heating indoor unit and the third indoor unit, enters the second heating indoor unit and the third indoor unit, is condensed and releases heat through the second indoor heat exchanger 22 and the third indoor heat exchanger 23 to become medium-temperature low-pressure gaseous refrigerant, is throttled and depressurized through a second indoor throttling element EXV2 and a third indoor throttling element EXV3, and then enters a high-pressure liquid pipe through heating one- way valves 312 and 313. A part of the refrigerant flowing out of the high-pressure liquid pipe enters the first heat exchanger 31, one path of the refrigerant entering the first indoor heat exchanger enters the first indoor unit and the fourth indoor unit through the refrigeration check valves 321 and 324 respectively, the refrigerant is evaporated and absorbs heat through the first indoor unit and the fourth indoor unit to form medium-pressure gaseous refrigerant, the medium-pressure gaseous refrigerant enters the low-pressure gas pipe through the corresponding refrigeration on-off valves 341 and 344, the other path of the refrigerant enters the low-pressure gas pipe through the second heat exchange flow path through the supercooling loop valve body EV, and the refrigerant collected in the low-pressure gas pipe flows back to the air return port of the compressor 13 through the outdoor gas-liquid separator; the other part of the air enters the first outdoor heat exchanger 11 of the outdoor unit 10, evaporates and absorbs heat in the first outdoor heat exchanger 11, enters the outdoor air-liquid separator 14 through the first four-way valve ST1, and flows back to the return port of the compressor 13 through the outdoor air-liquid separator 14.
Fig. 4 is a flowchart of a control method of a supercooling circuit valve body in a multi-split system according to an embodiment of the present invention. As shown in fig. 4, the method for controlling the subcooling circuit valve body in the multi-split system may include the following steps:
and S1, when the multi-split system operates in a pure refrigeration mode or a mixed refrigeration and heating mode, acquiring the outlet superheat degree of the second heat exchange flow path of the first heat exchanger, and adjusting the opening degree of the supercooling circuit valve body according to the outlet superheat degree and the current target outlet superheat degree.
According to one embodiment of the invention, adjusting the opening degree of the valve body of the supercooling circuit according to the outlet superheat degree and the current target outlet superheat degree comprises the following steps: if the outlet superheat degree is larger than the current target outlet superheat degree, the opening degree of the valve body of the supercooling circuit is increased; and if the outlet superheat degree is less than the current target outlet superheat degree, adjusting the opening degree of the valve body of the supercooling circuit to be small.
Specifically, when the multi-split air-conditioning system operates in a pure cooling mode or a hybrid cooling and heating mode, a temperature Tout and a pressure PL at the outlet of the second heat exchange flow path of the first heat exchanger are respectively obtained by a temperature sensor (such as a temperature sensing bulb) and a pressure sensor which are arranged at the outlet of the second heat exchange flow path of the first heat exchanger, and an outlet superheat degree DSH of the second heat exchange flow path of the first heat exchanger is calculated according to the temperature Tout and the pressure PL as Tout-T, wherein T is a saturation temperature corresponding to the pressure PL.
Alternatively, the temperature Tout at the outlet and the temperature Tin at the inlet of the second heat exchange flow path of the first heat exchanger are respectively obtained by a temperature sensor (such as a temperature sensing bulb) arranged at the outlet of the second heat exchange flow path of the first heat exchanger and a temperature sensor (such as a temperature sensing bulb) arranged at the inlet of the second heat exchange flow path of the first heat exchanger, and the outlet superheat degree DSH of the second heat exchange flow path of the first heat exchanger is calculated as Tout-Tin according to the temperature Tout at the outlet and the temperature Tin at the inlet.
Then, acquiring an outlet superheat degree DSH at intervals of a first preset time (such as 20s), and adjusting the opening degree of a supercooling circuit valve body according to the outlet superheat degree DSH and a current target outlet superheat degree DSHm1, wherein if DSH is greater than DSHm1, the opening degree of the supercooling circuit valve body is increased to reduce the outlet superheat degree DSH; if DSH < DSHm1, the opening degree of the supercooling circuit valve body is adjusted to be small to increase the outlet superheat degree DSH. The opening degree of the valve body of the supercooling circuit is adjusted to make the outlet superheat degree DSH equal to or close to the current target outlet superheat degree DSHm 1.
And S2, judging whether the indoor units have insufficient refrigerant.
Specifically, whether the indoor unit in the plurality of indoor units has insufficient refrigerant can be judged according to the parameters of the refrigeration indoor units. The parameters of the indoor unit for refrigeration can include indoor environment temperature, user set temperature, air outlet temperature of the indoor unit, opening degree of the indoor throttling element, inlet temperature of the indoor heat exchanger, outlet temperature of the indoor heat exchanger and the like.
For example, when the multi-split air-conditioning system operates in a pure cooling mode or a hybrid cooling and heating mode, if the outlet superheat degree of the indoor heat exchanger of a cooling indoor unit (outlet temperature of the indoor heat exchanger — inlet temperature of the indoor heat exchanger) exceeds a preset threshold value for a long time, and the opening degree of the indoor throttling element of the cooling indoor unit reaches the maximum opening degree, and meanwhile, the difference between the outlet air temperature of the cooling indoor unit and the indoor environment temperature is very small (or even close), it is determined that the cooling indoor unit has insufficient refrigerant, and at this time, it is determined that the indoor unit in the plurality of indoor units has insufficient refrigerant.
And S3, if the indoor units in the indoor units have insufficient refrigerant, adjusting the current target outlet superheat degree to be high, and adjusting the opening degree of the supercooling circuit valve body according to the adjusted target outlet superheat degree and the adjusted outlet superheat degree.
According to one embodiment of the present invention, if there is no refrigerant shortage in any of the indoor units, the current target outlet superheat degree is controlled to be maintained.
According to one embodiment of the invention, if liquid return of the indoor unit exists in a plurality of indoor units and the opening degree of the throttling element of the indoor unit reaches the preset minimum allowable opening degree, the current target outlet superheat degree is adjusted to be low.
Specifically, when the multi-split air-conditioning system operates in a pure cooling mode or a hybrid cooling and heating mode, if no indoor unit in the indoor units has insufficient refrigerant, the refrigerant entering the indoor unit through the first heat exchange flow path of the first heat exchanger is enough to ensure the cooling effect of the indoor unit, and at this time, the current target outlet superheat degree DSHm1 is controlled to be kept unchanged.
If the indoor units in the plurality of indoor units have insufficient refrigerant, the refrigerant passing through the supercooling circuit valve body is excessive, the refrigerant entering the indoor units through the first heat exchange flow path of the first heat exchanger is insufficient to ensure the refrigeration effect of the refrigeration indoor units, the current target outlet superheat degree DSHm1 can be increased by a certain value, and the opening degree of the supercooling circuit valve body is adjusted according to the adjusted target outlet superheat degree DSHm 2. Because the superheat DSH of the outlet of the second heat exchange flow path of the first heat exchanger is basically equal to the target outlet superheat DSHm1 through the adjustment, and the DSHm1 is smaller than the adjusted target outlet superheat DSHm2, the DSH is necessarily smaller than the DSHm2 at the moment, and the opening of the valve body of the supercooling circuit is reduced according to the DSHm2, so that the proper amount of refrigerant passing through the valve body of the supercooling circuit is reduced, and the proper amount of refrigerant entering the indoor unit through the first heat exchange flow path of the first heat exchanger is increased, so that the condition of insufficient refrigerant or bias flow of the indoor unit of the refrigerating unit is eliminated.
However, the target outlet superheat degree DSHm2 may not be increased all the time during the adjustment, and when the adjusted target outlet superheat degree DSHm2 is too large, another situation may occur, for example, the discharge air of the compressor is too high, or the valve body of the supercooling circuit does not perform the function of supercooling, and so on, so that the adjusted target outlet superheat degree DSHm2 is limited to be less than or equal to DSHm 1-MAX.
If the liquid returning of the indoor unit exists in the indoor units and the opening degree of the throttling element of the indoor unit reaches the preset minimum allowable opening degree, the current target outlet superheat degree DSHm1 is reduced by a certain value, and then the opening degree of the supercooling circuit valve body is adjusted according to the adjusted target outlet superheat degree DSHm 3. Since the superheat degree DSH of the outlet of the second heat exchange flow path of the first heat exchanger is substantially equal to the target outlet superheat degree DSHm1 through the foregoing adjustment, and DSHm1 is greater than the adjusted target outlet superheat degree DSHm3, the opening degree of the valve body of the supercooling circuit is gradually increased at this time, so that the amount of refrigerant passing through the valve body of the supercooling circuit is increased, and the amount of refrigerant entering the indoor unit through the first heat exchange flow path of the first heat exchanger is decreased. Therefore, on the premise of realizing supercooling, the problem of refrigerant return of the indoor unit of the refrigeration caused by the fact that a large-capacity flow dividing device is connected with fewer indoor units or only part of the load in a system runs can be solved.
However, the target outlet superheat degree cannot be always reduced during the adjustment, and when the target outlet superheat degree DSHm3 is too small, the supercooling circuit valve body itself has a problem of liquid return, so that the adjusted target outlet superheat degree DSHm3 is limited to be greater than or equal to DSHm 1-MIN.
Further, according to an embodiment of the present invention, the method for controlling a subcooling circuit valve body in a multiple split air conditioning system further includes: acquiring the total load of refrigerating indoor units and the capacity of a shunting device in a plurality of indoor units; the maximum allowable opening degree of the supercooling circuit valve body is obtained according to the ratio of the total load of the refrigeration indoor unit to the capacity of the flow dividing device, the opening degree of the supercooling circuit valve body is smaller than or equal to the maximum allowable opening degree, and the maximum allowable opening degree and the ratio are in positive correlation.
That is to say, when the multi-split air-conditioning system operates in the pure cooling mode or the hybrid cooling and heating mode, the total load of the cooling indoor units and the capacity of the shunt device (the maximum value of the capacity of the shunt device connected with the indoor units, which is specifically determined by the design target and hardware of the multi-split air-conditioning system) in the indoor units are also obtained, the maximum allowable opening degree of the valve body of the supercooling loop is obtained according to the total load of the cooling indoor units and the capacity of the shunt device in the indoor units, and then in the process of adjusting the opening degree of the valve body of the supercooling loop, the opening degree of the valve body of the supercooling loop is ensured not to exceed the maximum allowable opening degree, so that different maximum allowable opening degrees can be set for different loads, and the problems of insufficient refrigerant or bias flow, liquid return and the. The relation between the ratio of the total load of the refrigeration indoor unit to the capacity of the shunting device and the maximum opening degree of the supercooling circuit valve body is shown in fig. 5, the maximum allowable opening degree of the supercooling circuit valve body is increased along with the increase of the ratio of the total load of the refrigeration indoor unit to the capacity of the shunting device, and when the ratio of the total load of the refrigeration indoor unit to the capacity of the shunting device is 1, the maximum allowable opening degree of the supercooling circuit valve body is maximum and can be obtained through experimental tests.
In summary, according to the control method of the supercooling circuit valve body in the multi-split system in the embodiment of the present invention, when the multi-split system operates in the pure cooling mode or the hybrid cooling and heating mode, the outlet superheat degree of the second heat exchange flow path of the first heat exchanger is first obtained, the opening degree of the supercooling circuit valve body is adjusted according to the outlet superheat degree and the current target outlet superheat degree, then it is determined whether there is insufficient refrigerant in any indoor unit among the plurality of indoor units, if yes, the current target outlet superheat degree is increased, and the opening degree of the supercooling circuit valve body is adjusted according to the adjusted target outlet superheat degree and the adjusted outlet superheat degree. The method can avoid the problems of insufficient refrigerant or bias flow of the indoor unit of the refrigeration, liquid return and the like caused by the fact that a large-capacity flow dividing device is connected with fewer indoor units or only part of the load in the system runs on the premise of realizing supercooling.
In addition, an embodiment of the present invention also provides a computer-readable storage medium having instructions stored therein, where when the instructions are executed, the flow dividing device executes the control method of the subcooling circuit valve body in the multi-split system.
According to the computer-readable storage medium of the embodiment of the invention, by executing the control method of the supercooling loop valve body in the multi-split system, the problems of insufficient refrigerant or bias flow of the indoor unit of the refrigeration system or liquid return and the like caused by the fact that a large-capacity flow dividing device is connected with fewer indoor units or only part of the load in the system runs can be avoided on the premise of realizing supercooling.
The control device of the supercooling circuit valve body in the multi-split system according to the embodiment of the present invention will be described.
In an embodiment of the present invention, as shown in fig. 1, the multi-split system includes an outdoor unit 10, a plurality of indoor units 20, and a split device 30, where the split device 30 includes a first heat exchanger 31, an inlet of a first heat exchange flow path of the first heat exchanger 31 is connected to a high pressure liquid pipe of the outdoor unit 10, an outlet of the first heat exchange flow path of the first heat exchanger 31 is connected to each of the plurality of indoor units 20, an inlet of a second heat exchange flow path of the first heat exchanger 31 is connected to an outlet of the first heat exchange flow path of the first heat exchanger 31 through a supercooling circuit valve EV, and an outlet of the second heat exchange flow path of the first heat exchanger 31 is connected to a low pressure liquid pipe of the outdoor unit 10.
Fig. 6 is a block schematic diagram of a control device of a supercooling circuit valve body in a multi-split system according to an embodiment of the invention. As shown in fig. 6, the control device of the subcooling circuit valve body in the multi-split system may include a first obtaining module 100, a control module 200 and a judging module 300.
When the multi-split air conditioning system operates in a pure cooling mode or a hybrid cooling and heating mode, the first obtaining module 100 is configured to obtain an outlet superheat degree of the second heat exchange flow path of the first heat exchanger. The control module 200 is configured to adjust the opening of the subcooling circuit valve body based on the outlet superheat and the current target outlet superheat. The determining module 300 is configured to determine whether there is an indoor unit with insufficient refrigerant in the plurality of indoor units. When the refrigerant in any indoor unit is insufficient, the control module 200 is further configured to increase the current target outlet superheat degree, and adjust the opening of the subcooling circuit valve body according to the adjusted target outlet superheat degree and outlet superheat degree.
According to an embodiment of the present invention, if there is no refrigerant shortage in any of the indoor units, the control module 200 controls the current target outlet superheat degree to remain unchanged.
According to one embodiment of the invention, if liquid returning from the indoor unit exists in a plurality of indoor units and the opening degree of the throttling element of the indoor unit reaches the preset minimum allowable opening degree, the control module 200 adjusts the current target outlet superheat degree to be low.
According to one embodiment of the invention, when the control module 200 adjusts the opening degree of the subcooling circuit valve body according to the outlet superheat degree and the current target outlet superheat degree, wherein if the outlet superheat degree is greater than the current target outlet superheat degree, the control module 200 increases the opening degree of the subcooling circuit valve body; if the outlet superheat degree is smaller than the current target outlet superheat degree, the control module 200 adjusts the opening degree of the valve body of the supercooling circuit to be small.
According to an embodiment of the present invention, as shown in fig. 7, the control device of the subcooling circuit valve body in the multi-split air-conditioning system may further include a second obtaining module 400, where the second obtaining module 400 is configured to obtain a total load of the cooling indoor units and a capacity of the flow dividing device in the plurality of indoor units, and the control module 200 is further configured to obtain a maximum allowable opening degree of the subcooling circuit valve body according to a ratio of the total load of the cooling indoor units to the capacity of the flow dividing device, and make the opening degree of the subcooling circuit valve body smaller than or equal to the maximum allowable opening degree, where the maximum allowable opening degree is in a positive correlation with the ratio.
It should be noted that details of the control device for the subcooling circuit valve body in the multi-split system according to the embodiment of the present invention are not disclosed, and reference is made to details disclosed in the control method for the subcooling circuit valve body in the multi-split system according to the embodiment of the present invention, and details are not described here.
According to the control device of the supercooling circuit valve body in the multi-split system, when the multi-split system operates in a pure refrigeration mode or a mixed refrigeration and heating mode, firstly, the outlet superheat degree of the second heat exchange flow path of the first heat exchanger is obtained through the first obtaining module, and the opening degree of the supercooling circuit valve body is adjusted through the control module according to the outlet superheat degree and the current target outlet superheat degree. And then, judging whether an indoor unit in the indoor units has insufficient refrigerant through a judging module, and when the indoor unit in the indoor units has insufficient refrigerant, increasing the current target outlet superheat degree through a control module, and adjusting the opening degree of the supercooling loop valve body according to the adjusted target outlet superheat degree and the adjusted outlet superheat degree. The device can avoid the problems of insufficient refrigerant or bias flow of the indoor machine of the refrigeration, liquid return and the like caused by the fact that a large-capacity flow dividing device is connected with fewer indoor machines or only part of the load in a system runs on the premise of realizing supercooling.
In addition, the embodiment of the invention also provides a multi-split system, which comprises the control device of the supercooling circuit valve body.
According to the multi-split system provided by the embodiment of the invention, on the premise of realizing supercooling, the problems of insufficient refrigerant or bias flow of the indoor unit of the refrigeration system, liquid return and the like caused by the fact that a large-capacity flow dividing device is connected with fewer indoor units or only part of load operation in the system can be avoided through the control device of the supercooling loop valve body in the multi-split system.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In addition, in the description of the present invention, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (12)
1. A control method of a supercooling loop valve body in a multi-split system, wherein the multi-split system comprises an outdoor unit, a plurality of indoor units and a flow dividing device, the flow dividing device comprises a first heat exchanger, an inlet of a first heat exchange flow path of the first heat exchanger is connected with a high-pressure liquid pipe of the outdoor unit, an outlet of the first heat exchange flow path of the first heat exchanger is connected with each indoor unit in the plurality of indoor units, an inlet of a second heat exchange flow path of the first heat exchanger is connected with an outlet of the first heat exchange flow path of the first heat exchanger through the supercooling loop valve body, and an outlet of the second heat exchange flow path of the first heat exchanger is connected with a low-pressure gas pipe of the outdoor unit, the control method is characterized by comprising the following steps:
when the multi-split air conditioning system operates in a pure refrigeration mode or a mixed refrigeration and heating mode, acquiring the outlet superheat degree of a second heat exchange flow path of the first heat exchanger, and adjusting the opening degree of a valve body of the supercooling circuit according to the outlet superheat degree and the current target outlet superheat degree;
judging whether an indoor unit in the plurality of indoor units has insufficient refrigerant;
and if the indoor units in the plurality of indoor units have insufficient refrigerant, adjusting the current target outlet superheat degree to be high, and adjusting the opening degree of the supercooling loop valve body according to the adjusted target outlet superheat degree and the outlet superheat degree.
2. The method as claimed in claim 1, wherein if there is no refrigerant shortage in any of the indoor units, the current target outlet superheat degree is controlled to remain unchanged.
3. The method for controlling a subcooling circuit valve body in a multi-split system as described in claim 1, wherein the current target outlet superheat is adjusted to be low if there is an indoor unit drain back in the indoor units and the opening degree of the throttling element of the indoor unit reaches a preset minimum allowable opening degree.
4. The control method of a subcooling circuit valve body in a multi-split system as described in any one of claims 1 to 3, wherein said adjusting the opening degree of the subcooling circuit valve body based on the outlet superheat degree and the current target outlet superheat degree comprises:
if the outlet superheat degree is larger than the current target outlet superheat degree, the opening degree of the supercooling circuit valve body is increased;
and if the outlet superheat degree is less than the current target outlet superheat degree, adjusting the opening degree of the supercooling circuit valve body to be small.
5. The method for controlling a subcooling circuit valve body in a multi-split system as described in claim 4, further comprising:
acquiring the total load of refrigerating indoor units in the indoor units and the capacity of the shunting device;
and acquiring the maximum allowable opening degree of the supercooling circuit valve body according to the ratio of the total load of the refrigeration indoor unit to the capacity of the flow dividing device, and enabling the opening degree of the supercooling circuit valve body to be smaller than or equal to the maximum allowable opening degree, wherein the maximum allowable opening degree and the ratio are in positive correlation.
6. A computer-readable storage medium having instructions stored therein, wherein when the instructions are executed, the flow dividing device performs a control method of a subcooling circuit valve body in a multi-split system as described in any one of claims 1 to 5.
7. A control device for a supercooling loop valve body in a multi-split system, wherein the multi-split system comprises an outdoor unit, a plurality of indoor units and a flow dividing device, the flow dividing device comprises a first heat exchanger, an inlet of a first heat exchange flow path of the first heat exchanger is connected with a high-pressure liquid pipe of the outdoor unit, an outlet of the first heat exchange flow path of the first heat exchanger is connected with each indoor unit in the indoor units, an inlet of a second heat exchange flow path of the first heat exchanger is connected with an outlet of the first heat exchange flow path of the first heat exchanger through the supercooling loop valve body, and an outlet of the second heat exchange flow path of the first heat exchanger is connected with a low-pressure gas pipe of the outdoor unit, and the control device is characterized by comprising:
the first obtaining module is used for obtaining the superheat degree of an outlet of a second heat exchange flow path of the first heat exchanger when the multi-split air conditioning system operates in a pure cooling mode or a mixed cooling and heating mode;
the control module is used for adjusting the opening of the supercooling circuit valve body according to the outlet superheat degree and the current target outlet superheat degree;
the judging module is used for judging whether the indoor units in the plurality of indoor units have insufficient refrigerants;
the control module is further used for increasing the current target outlet superheat degree when the indoor units in the indoor units have insufficient refrigerants, and adjusting the opening degree of the supercooling loop valve body according to the adjusted target outlet superheat degree and the outlet superheat degree.
8. The apparatus as claimed in claim 7, wherein the control module controls the current target outlet superheat degree to be maintained if there is no refrigerant shortage in any of the indoor units.
9. The apparatus as claimed in claim 7, wherein the control module adjusts the current target outlet superheat degree to be low if there is an indoor unit drain back in the plurality of indoor units and an opening degree of a throttling element of the indoor unit reaches a preset minimum allowable opening degree.
10. The control device of a subcooling circuit valve body in a multi-split system as described in any one of claims 7 to 9, wherein said control module adjusts the opening degree of said subcooling circuit valve body based on said outlet superheat degree and a current target outlet superheat degree, wherein,
if the outlet superheat degree is larger than the current target outlet superheat degree, the control module adjusts the opening degree of the supercooling circuit valve body to be larger;
and if the outlet superheat degree is smaller than the current target outlet superheat degree, the control module adjusts the opening degree of the supercooling circuit valve body to be small.
11. A control apparatus of a supercooling circuit valve body in a multi-split system as set forth in claim 10, further comprising:
the second acquisition module is used for acquiring the total load of the refrigerating indoor units in the indoor units and the capacity of the shunting device;
the control module is further configured to obtain a maximum allowable opening degree of the supercooling circuit valve body according to a ratio of a total load of the refrigeration indoor unit to a capacity of the flow dividing device, and enable the opening degree of the supercooling circuit valve body to be smaller than or equal to the maximum allowable opening degree, where the maximum allowable opening degree and the ratio are in a positive correlation.
12. A multi-split system comprising a control device of a supercooling circuit valve body of any one of claims 7 to 11.
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| CN110131838B (en) * | 2019-05-17 | 2020-07-14 | 珠海格力电器股份有限公司 | Air conditioning unit control method and device, computer equipment and storage medium |
| CN111928410B (en) * | 2020-06-30 | 2023-05-26 | 青岛海尔空调器有限总公司 | Control method for multi-split air conditioning unit |
| CN112033040B (en) * | 2020-09-15 | 2022-08-30 | 广东美的暖通设备有限公司 | Control method of air conditioning system and computer-readable storage medium |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1275700A (en) * | 2000-06-02 | 2000-12-06 | 海尔集团公司 | Improved refrigerating system for one driving multiple-unit air conditioner |
| CN1906452A (en) * | 2004-07-01 | 2007-01-31 | 大金工业株式会社 | Air conditioner |
| CN101960234A (en) * | 2008-02-29 | 2011-01-26 | 大金工业株式会社 | Air conditioner |
| CN104748429A (en) * | 2015-03-31 | 2015-07-01 | 广东美的暖通设备有限公司 | Multiple on-line system |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3377632B2 (en) * | 1994-12-06 | 2003-02-17 | 東芝キヤリア株式会社 | Air conditioner |
| JPH11257762A (en) * | 1998-03-12 | 1999-09-24 | Denso Corp | Refrigeration cycle system |
| KR100803145B1 (en) * | 2007-03-31 | 2008-02-14 | 엘지전자 주식회사 | Air conditioner |
| JP5447499B2 (en) * | 2011-12-28 | 2014-03-19 | ダイキン工業株式会社 | Refrigeration equipment |
-
2017
- 2017-08-15 CN CN201710697630.2A patent/CN107559953B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1275700A (en) * | 2000-06-02 | 2000-12-06 | 海尔集团公司 | Improved refrigerating system for one driving multiple-unit air conditioner |
| CN1906452A (en) * | 2004-07-01 | 2007-01-31 | 大金工业株式会社 | Air conditioner |
| CN101960234A (en) * | 2008-02-29 | 2011-01-26 | 大金工业株式会社 | Air conditioner |
| CN104748429A (en) * | 2015-03-31 | 2015-07-01 | 广东美的暖通设备有限公司 | Multiple on-line system |
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