CN110631285A - Multi-split system and control method thereof - Google Patents

Multi-split system and control method thereof Download PDF

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Publication number
CN110631285A
CN110631285A CN201910945304.8A CN201910945304A CN110631285A CN 110631285 A CN110631285 A CN 110631285A CN 201910945304 A CN201910945304 A CN 201910945304A CN 110631285 A CN110631285 A CN 110631285A
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China
Prior art keywords
indoor
indoor unit
pipe
started
controlling
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Granted
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CN201910945304.8A
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Chinese (zh)
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CN110631285B (en
Inventor
李友良
邓建云
李安民
王军强
郑涛
李兆辉
庄子宝
孙星星
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Midea Group Co Ltd
GD Midea Heating and Ventilating Equipment Co Ltd
Guangdong Midea HVAC Equipment Co Ltd
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Midea Group Co Ltd
GD Midea Heating and Ventilating Equipment Co Ltd
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Priority to CN201910945304.8A priority Critical patent/CN110631285B/en
Publication of CN110631285A publication Critical patent/CN110631285A/en
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    • 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
    • F25B41/30—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
    • 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
    • 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
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
    • 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
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
    • F25B2313/02742—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using two four-way 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
    • F25B2500/00—Problems to be solved
    • F25B2500/12—Sound

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention provides a multi-split system and a control method thereof, the multi-split system comprises an outdoor unit and a plurality of indoor units, the indoor units comprise at least one three-pipe indoor unit and at least one two-pipe indoor unit, each three-pipe indoor unit is connected with a liquid pipe, a high-low pressure pipe and an air pipe of the outdoor unit, and each two-pipe indoor unit is connected with a liquid pipe and an air pipe of the outdoor unit, and the method comprises the following steps: determining the starting mode of the indoor unit of the multi-split system; in the process of controlling the mixed starting of the three-pipe indoor unit and the two-pipe indoor unit, the throttle devices of the two-pipe indoor unit to be started are controlled to be opened at a first opening degree, the indoor main throttle device and the indoor auxiliary throttle device of the three-pipe indoor unit to be started are controlled to be kept closed, and the opening degrees of the indoor main throttle device and the indoor auxiliary throttle device of the three-pipe indoor unit to be started are controlled to be gradually increased until the preset opening time is reached, so that the mixed starting abnormal sound of the three-pipe indoor unit and the two-pipe indoor unit is effectively inhibited.

Description

Multi-split system and control method thereof
Technical Field
The invention relates to the technical field of air conditioners, in particular to a multi-split system and a control method thereof.
Background
In a multi-split air-conditioning system in the related art, a three-pipe indoor unit is adopted to realize constant-temperature initialization, but experimental research shows that when a refrigeration and dehumidification reheating mode is operated, when a refrigerant entering the three-pipe indoor unit is in a gas-liquid two-phase state, abnormal sound is generated when the refrigerant is throttled by an electronic expansion valve. For example, when the three-pipe indoor unit and the two-pipe indoor unit are started in a mixed manner, the three-pipe indoor unit has a coupling effect of cold and hot refrigerants, so that discontinuous refrigerant abnormal sounds exist in the starting process, and user experience is reduced.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, a first objective of the present invention is to provide a method for controlling a multi-split system, so as to effectively suppress the start-up abnormal sound and improve the user experience.
A second object of the present invention is to provide a multi-split system.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides a method for controlling a multi-split system, where the multi-split system includes an outdoor unit and a plurality of indoor units, each of the indoor units includes at least one three-controlled indoor unit and at least one two-controlled indoor unit, each of the three-controlled indoor units is connected to a liquid pipe, a high-low pressure pipe, and an air pipe of the outdoor unit, and each of the two-controlled indoor units is connected to a liquid pipe and an air pipe of the outdoor unit, where the method includes: determining a starting mode of an indoor unit of the multi-split system; in the process of controlling the mixed starting of the three-control indoor unit and the two-control indoor unit, the throttle devices of the two-control indoor unit to be started are controlled to be opened at a first opening degree, the indoor main throttle device and the indoor auxiliary throttle device of the three-control indoor unit to be started are controlled to be kept closed, and the opening degrees of the indoor main throttle device and the indoor auxiliary throttle device of the three-control indoor unit to be started are controlled to be gradually increased until the preset opening time is reached.
According to the control method of the multi-split system provided by the embodiment of the invention, in the process of controlling the mixed starting of the three-pipe indoor unit and the two-pipe indoor unit, the throttle devices of the two-pipe indoor unit to be started are controlled to be opened at the first opening degree, the indoor main throttle device and the indoor auxiliary throttle device of the three-pipe indoor unit to be started are controlled to be kept closed, and the opening degrees of the indoor main throttle device and the indoor auxiliary throttle device of the three-pipe indoor unit to be started are controlled to be gradually increased until the preset opening time is reached, so that the mixed starting abnormal sound of the three-pipe indoor unit and the two-pipe indoor unit is effectively inhibited, and the user experience is improved.
According to an embodiment of the present invention, the method for controlling a multi-split system further includes: and in the process of controlling the starting of the two-control indoor unit on the basis of the started three-control indoor unit, controlling the indoor main throttling device and the indoor auxiliary throttling device of the started three-control indoor unit to be closed, and controlling the throttling devices of the two started three-control indoor units to be opened at a first opening degree.
According to an embodiment of the present invention, the method for controlling a multi-split system further includes: in the process of controlling the starting of the two-control indoor unit on the basis of the starting of the two-control indoor unit and the starting of the three-control indoor unit, the opening degree of the throttling device of the started two-control indoor unit is controlled according to the superheat degree of the outlet of the started two-control indoor unit, the closing of the indoor main throttling device and the indoor auxiliary throttling device of the started three-control indoor unit is controlled, and the opening of the throttling devices of the started two-control indoor unit is controlled to be in the first opening degree.
According to an embodiment of the present invention, when controlling the throttle devices of the two managed indoor units to be activated to be opened at the first opening degree, the method further includes: and controlling the opening degree of the supercooling throttling device of the outdoor unit to be gradually increased.
According to an embodiment of the present invention, the controlling of the opening degree of the supercooling throttling means of the outdoor unit to be gradually increased includes: controlling a supercooling throttling device of the outdoor unit to be closed for a first preset time; controlling the supercooling throttling device of the outdoor unit to be opened at a second opening degree and continue for a second preset time; determining to open a third opening according to the opening number of the indoor units, and controlling the supercooling throttling device of the outdoor unit to be opened at the third opening for a third preset time; and adjusting the opening degree of the supercooling throttling device of the outdoor unit according to the supercooling degree of the outdoor unit.
According to an embodiment of the present invention, the controlling the opening degree of the indoor main throttle device of the to-be-started three-pipe controlled indoor unit to gradually increase includes: controlling the indoor main throttling device of the started three-pipe indoor unit to be closed for a fourth preset time; controlling the indoor main throttling device of the to-be-started three-pipe indoor unit to be opened at a fifth opening degree and continue for a fifth preset time; controlling the indoor main throttling device of the to-be-started three-pipe indoor unit to increase a sixth preset opening degree every sixth preset time until the first target opening degree is reached; and after the first target opening degree is kept for a seventh preset time, adjusting the opening degree of an indoor main throttling device of the to-be-started three-pipe indoor unit according to the outlet superheat degree of the to-be-started three-pipe indoor unit.
According to an embodiment of the present invention, the controlling the opening degree of the indoor auxiliary throttling device of the to-be-started three-pipe controlled indoor unit to gradually increase includes: controlling the indoor auxiliary throttling device of the started three-pipe indoor unit to be closed and lasting for an eighth preset time; controlling the indoor auxiliary throttling device of the to-be-started three-pipe indoor unit to be opened at the initial opening degree and continue for a ninth preset time; and controlling the indoor auxiliary throttling device of the started three-pipe indoor unit to increase the sixth preset opening degree every sixth preset time until the second target opening degree is reached.
According to one embodiment of the invention, when the throttling devices of the two control indoor units to be started are controlled to be opened at the first opening degree, the frequency limiting control is also carried out on the compressor, so that the running frequency of the compressor is greater than the first running frequency.
To achieve the above object, a second embodiment of the present invention provides a multi-split system, including: an outdoor unit; the indoor units comprise at least one three-pipe indoor unit and at least one two-pipe indoor unit, each three-pipe indoor unit is connected with a liquid pipe, a high-low pressure pipe and an air pipe of the outdoor unit, and each two-pipe indoor unit is connected with the liquid pipe and the air pipe of the outdoor unit; and the control module is used for determining the starting mode of the indoor unit of the multi-split system, controlling the throttle devices of the two started indoor units to be opened at a first opening degree in the process of controlling the mixed starting of the three-control indoor unit and the two-control indoor unit, controlling the main indoor throttle device and the auxiliary indoor throttle device of the three-control indoor unit to be closed, and controlling the opening degrees of the main indoor throttle device and the auxiliary indoor throttle device of the three-control indoor unit to be gradually increased until the preset opening time is reached.
According to the multi-split system provided by the embodiment of the invention, in the process of controlling the mixed starting of the three-control indoor unit and the two-control indoor unit, the control module controls the throttle devices of the two-control indoor unit to be started to be opened at the first opening degree, and controls the main indoor throttle device and the auxiliary indoor throttle device of the three-control indoor unit to be kept closed until the preset opening time is reached, and controls the opening degrees of the main indoor throttle device and the auxiliary indoor throttle device of the three-control indoor unit to be gradually increased, so that the mixed starting abnormal sound of the three-control indoor unit and the two-control indoor unit is effectively inhibited, and the user experience is improved.
According to an embodiment of the present invention, the control module is further configured to, in a process of controlling the two-pipe indoor unit to start based on the three-pipe indoor unit that has started, control the indoor main throttling device and the indoor auxiliary throttling device of the three-pipe indoor unit that have started to close, and control the throttling devices of the two-pipe indoor unit that will start to open at the first opening degree.
According to an embodiment of the present invention, the control module is further configured to, in a process of controlling the two-pipe indoor unit to be started based on the started two-pipe indoor unit and the started three-pipe indoor unit, control opening degrees of the throttle devices of the started two-pipe indoor unit according to an outlet superheat degree of the started two-pipe indoor unit, control an indoor main throttle device and an indoor auxiliary throttle device of the started three-pipe indoor unit to be closed, and control the throttle devices of the started two-pipe indoor unit to be opened at a first opening degree.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a flowchart of a control method of a multi-split system according to an embodiment of the present invention;
fig. 2 is a schematic configuration diagram of a multi-split system according to an embodiment of the present invention;
fig. 3 is a flowchart of a control method of a multi-split system according to an embodiment of the present invention;
fig. 4 is a control schematic diagram of a control method of a multi-split system according to an embodiment of the present invention;
fig. 5 is a control schematic diagram of a control method of a multi-split system according to another embodiment of the present invention;
fig. 6 is a control schematic diagram of a control method of a multi-split system according to still another embodiment of the present invention;
fig. 7 is a block diagram schematically illustrating 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 multi-split system and a control method thereof according to an embodiment of the present invention will be described below with reference to the accompanying drawings.
Fig. 1 is a flowchart of a control method of a multi-split system according to an embodiment of the present invention. As shown in fig. 1, the control method of the multi-split system includes the steps of:
s1: and determining the starting mode of the indoor unit of the multi-split system.
The multi-split system comprises an outdoor unit and a plurality of indoor units, wherein each indoor unit comprises at least one three-pipe indoor unit and at least one two-pipe indoor unit, each three-pipe indoor unit is connected with a liquid pipe, a high-low pressure pipe and an air pipe of the outdoor unit, and each two-pipe indoor unit is connected with a liquid pipe and an air pipe of the outdoor unit.
Specifically, the multi-split system may have a structure as shown in fig. 2, wherein the outdoor unit 100 includes a compressor 101, a first four-way valve 102, a second four-way valve 103, an outdoor heat exchanger 104, a liquid pipe 105, a high-low pressure pipe 106, a gas pipe 107, a low-pressure tank 108, an outdoor main throttle 109, a subcooler throttle 110, a subcooler 111, etc., a d-end of the first four-way valve 102 and a d-end of the second four-way valve 103 are connected to an exhaust port of the compressor 101, an s-end of the first four-way valve 102 and an s-end of the second four-way valve 103 are connected to a suction port of the compressor 101 through the low-pressure tank 108, an e-end of the first four-way valve 102 is connected to the gas pipe 107, a c-end of the first four-way valve 102 is connected to a first end of the outdoor heat exchanger 104; a second end of the outdoor heat exchanger 104 is connected with a first end of an outdoor main throttling device 109; the second end of the outdoor main throttling device 109 is connected with the first end of the subcooler 111, and is also connected with the third end of the subcooler 111 through a capillary tube and the subcooler throttling device 110; the second end of the subcooler 111 is connected to the low-pressure tank 108, and the fourth end of the subcooler 111 is connected to the liquid pipe 105.
The plurality of indoor units include at least one three-pipe indoor unit 200A and at least one two-pipe indoor unit 200B. Each three-pipe indoor unit 200A comprises an indoor main heat exchanger 201, an indoor auxiliary heat exchanger 202, an indoor main throttling device 203 and an indoor auxiliary throttling device 204, wherein a first end of the indoor main heat exchanger 201 is connected with a liquid pipe 105 of the outdoor unit 100 through the indoor main throttling device 203, and a second end of the indoor main heat exchanger 201 is connected with a gas pipe 107 of the outdoor unit 100; a first end of the indoor auxiliary heat exchanger 202 is connected to the liquid pipe 105 of the outdoor unit 100 through the indoor auxiliary throttle device 204, and a second end of the indoor auxiliary heat exchanger 202 is connected to the high and low pressure pipes 106 of the outdoor unit 100. Each of the two-pipe indoor units 200B includes an indoor heat exchanger 205 and a throttling device 206, a first end of the indoor heat exchanger 205 is connected to the liquid pipe 105 of the outdoor unit 100 through the throttling device 206, and a second end of the indoor heat exchanger 205 is connected to the air pipe 107 of the outdoor unit 100.
It should be noted that the structures and operating principles of the outdoor unit and the indoor unit belong to the prior art, and are well known to those skilled in the art, and detailed descriptions thereof are omitted.
The multi-split air conditioning system provided by the embodiment of the invention can be compatible with a constant temperature dehumidification mode and a refrigeration mode, namely, the multi-split air conditioning system can operate the refrigeration mode through two control indoor units when the constant temperature dehumidification mode is operated through the three control indoor units.
As an example, in the embodiment of the present invention, each of the throttling devices may be an electronic expansion valve.
S2: in the process of controlling the mixed starting of the three-control indoor unit and the two-control indoor unit, the throttle devices of the two-control indoor unit to be started are controlled to be opened at a first opening degree, the indoor main throttle device and the indoor auxiliary throttle device of the three-control indoor unit to be started are controlled to be kept closed, and the opening degrees of the indoor main throttle device and the indoor auxiliary throttle device of the three-control indoor unit to be started are controlled to be gradually increased until the preset opening time is reached.
That is, after the opening devices of the two managed indoor units to be started are opened at the first opening degree for the preset opening time, the opening time of the opening devices of the two managed indoor units to be started is recorded, and when the opening time reaches the preset opening time, the opening degrees of the opening devices of the two managed indoor units to be started are controlled according to the outlet superheat degrees of the two managed indoor units to be started, for example, the opening degrees of the opening devices of the two managed indoor units to be started are controlled in a proportional-integral control manner. Meanwhile, the opening degree of the indoor main throttling device of the to-be-started three-pipe indoor unit is controlled to gradually increase, and the opening degree of the indoor auxiliary throttling device of the to-be-started three-pipe indoor unit is controlled to gradually increase.
Further, according to an embodiment of the present invention, when controlling the throttle devices of the two managed indoor units to be activated to be opened at the first opening degree, the method further includes: the opening degree of the supercooling throttling device of the outdoor unit is controlled to be gradually increased.
The inventor of the present application has found through experiments that when the three-pipe indoor unit and the two-pipe indoor unit are started in a mixed manner, discontinuous refrigerant noise may be generated. The refrigerant sound is correlated with the degree of supercooling of the outdoor unit, the amount of refrigerant, the opening degree of the throttling device and the like. When the degree of supercooling of the outdoor unit is insufficient, the refrigerant is easily in a gas-liquid two-phase state before entering the indoor main throttling device and the indoor auxiliary throttling device due to the influence of on-way resistance and refrigerant flash factors, and the refrigerant in the gas-liquid two-phase state is throttled by the electronic expansion valve to generate discontinuous refrigerant sound. When the quantity of refrigerant entering the indoor unit is insufficient, the flow state of the refrigerant is in a bubble shape, and abnormal sound is generated when the refrigerant passes through the throttling device. If the total opening of the throttling device for opening the indoor unit is too large during starting, the refrigerant can not fully exchange heat in the outdoor heat exchanger, so that the supercooling degree of the outdoor unit is difficult to build, and running noise can be generated due to insufficient supercooling degree.
Specifically, when the three-pipe indoor unit and the two-pipe indoor unit are started in a mixed mode, the three-pipe indoor unit and the two-pipe indoor unit are controlled to operate at a first opening degree of 300P for example after being started, and meanwhile, the opening degrees of an indoor main throttling device and an indoor auxiliary throttling device of the three-pipe indoor unit are controlled to be kept closed, namely 0P, so that the phenomenon that the total opening degree of the throttling device is too large during starting is avoided, and the supercooling degree is more favorably realized. And the opening degree of the supercooling throttling device of the outdoor unit is controlled to be gradually increased from 0P, so that the indoor unit is quickly filled with the refrigerant by controlling the supercooling throttling device to be closed, and then the supercooling of the outdoor unit is realized by a small opening degree. Therefore, the mixed starting abnormal sound of the three-pipe indoor unit and the two-pipe indoor unit can be effectively reduced, and the user experience is improved.
According to an embodiment of the present invention, controlling an opening degree of a supercooling throttling means of an outdoor unit to be gradually increased includes: controlling a supercooling throttling device of the outdoor unit to be closed for a first preset time; controlling the supercooling throttling device of the outdoor unit to be opened at a second opening degree and continue for a second preset time; determining to open a third opening according to the opening number of the indoor units, and controlling the supercooling throttling device of the outdoor unit to be opened by the third opening for a third preset time; and adjusting the opening degree of the supercooling throttling device of the outdoor unit according to the supercooling degree of the outdoor unit.
The sum of the first preset time, the second preset time and the third preset time is less than or equal to the preset opening time of the throttling device of the two-pipe indoor unit, for example, the preset opening time may be 5 minutes, the first preset time and the second preset time may be 1 minute, and the third preset time may be 2 minutes.
That is, in the process of opening the throttle devices of the two activated pipe-controlled indoor units at a first opening degree, the supercooling throttle device of the outdoor unit is firstly operated at 0P (closed) for a first preset time, and then operated at a second opening degree, for example, 56P for a second preset time, so that the indoor unit is quickly filled with the refrigerant, and then the outdoor unit is supercooled at a small opening degree, and then the third opening degree of the supercooling throttle device of the outdoor unit is controlled according to the opening number of the indoor units, for example, when 1 indoor unit is opened, the supercooling throttle device of the outdoor unit is controlled to be opened at 56P for 2 minutes, when 2 indoor units are opened, the supercooling throttle device of the outdoor unit is controlled to be opened at 120P for 2 minutes, and when the opening number of the indoor units is greater than or equal to 3, the supercooling throttle device of the outdoor unit is controlled to be opened at 200P. And after the third preset time, adjusting the opening degree of the supercooling throttling device of the outdoor unit according to the supercooling degree of the outdoor unit.
According to an embodiment of the present invention, controlling an opening degree of an indoor main throttle device of a three-pipe controlled indoor unit to be started to gradually increase includes: controlling the indoor main throttling device of the started three-pipe indoor unit to be closed for a fourth preset time; controlling an indoor main throttling device of the started three-pipe indoor unit to be opened at a fifth opening degree and continue for a fifth preset time; controlling an indoor main throttling device of the started three-pipe indoor unit to increase a sixth preset opening degree every sixth preset time until the first target opening degree is reached; and after the first target opening degree is kept for the seventh preset time, adjusting the opening degree of the indoor main throttling device of the to-be-started three-pipe-control indoor unit according to the outlet superheat degree of the to-be-started three-pipe-control indoor unit.
That is, after opening the throttling devices of the two started indoor units with a first opening degree for a preset opening time, controlling the indoor main throttling device of the three started indoor units to be kept at 0P (closed) for a fourth preset time such as 30s, then controlling the indoor main throttling device of the three started indoor units to be opened with a fifth opening degree such as 48P for a fifth preset time such as 30s, then controlling the indoor main throttling device of the three started indoor units to be increased by a sixth preset opening degree such as 8P every sixth preset time such as 30s until reaching the first target opening degree such as 96P, and then adjusting the opening degree of the indoor main throttling device of the three started indoor units according to the outlet superheat degree of the three started indoor units after keeping the first target opening degree for the seventh preset time such as 1.5 minutes or 2 minutes, for example, controlling the opening degree of the indoor main throttling device of the three started indoor units in a proportional integral control manner .
According to an embodiment of the present invention, controlling the opening degree of the indoor auxiliary throttle device of the three-pipe controlled indoor unit to be started to gradually increase includes: controlling the started indoor auxiliary throttling device of the three-pipe indoor unit to be closed and lasting for an eighth preset time; controlling an indoor auxiliary throttling device of the started three-pipe indoor unit to be opened at an initial opening degree and continue for a ninth preset time; and controlling the started indoor auxiliary throttling device of the three-pipe indoor unit to increase the sixth preset opening degree every sixth preset time until the second target opening degree is reached.
That is, after the opening devices of the two started control indoor units are opened for the preset opening time at the first opening degree, the indoor auxiliary opening device of the three started control indoor unit is controlled to be kept at 0P (closed) for the eighth preset time, for example, 3min30s, then the indoor auxiliary opening device of the three started control indoor unit is controlled to be opened to the initial opening degree and kept for the ninth preset time, for example, 1 minute or 2.5 minutes, and then the indoor auxiliary opening device of the three started control indoor unit is controlled to be increased by the sixth preset opening degree, for example, 8P, every sixth preset time, for example, 30s until the second target opening degree, for example, 96P, is reached. Thereafter, the opening degree of the indoor auxiliary throttle device of the activated three-pipe controlled indoor unit is maintained at the second target opening degree, for example, 96P.
According to one embodiment of the invention, when the throttling devices of the two control indoor units to be started are controlled to be opened at the first opening degree, the frequency limiting control is also carried out on the compressor, so that the running frequency of the compressor is greater than the first running frequency.
Specifically, after the compressor is started, within a preset starting time, the calculation frequency of the compressor is obtained, the calculation frequency of the compressor is compared with a first operation frequency, such as 30Hz, when the calculation frequency of the compressor is greater than 30Hz, the operation of the compressor is controlled at the calculation frequency, and when the calculation frequency of the compressor is less than or equal to 30Hz, the operation of the compressor is controlled at 30 Hz. Wherein, the calculation frequency of the compressor can be determined according to the operation requirement of the multi-split system.
After the compressor is operated for the preset on-time, the operating frequency of the compressor is controlled according to the target operating frequency (such as proportional-integral control).
According to another embodiment of the present invention, as shown in fig. 3, the method for controlling a multi-split system further includes:
s3: and in the process of controlling the starting of the two-control indoor unit on the basis of the started three-control indoor unit, controlling the indoor main throttling device and the indoor auxiliary throttling device of the started three-control indoor unit to be closed, and controlling the throttling devices of the two started three-control indoor units to be opened at a first opening degree.
That is to say, two control indoor units are additionally arranged on the basis of the opened three-control indoor unit, the indoor main throttling device and the indoor auxiliary throttling device of the opened three-control indoor unit are firstly closed to 0P, the fan of the opened three-control indoor unit normally operates, and the opening degree of the supercooling throttling device of the outdoor unit is automatically adjusted according to the supercooling degree of the outdoor unit. Then, the throttle devices of the two-pipe indoor units to be started are controlled to be opened at the first opening degree, and the two-pipe indoor units to be started and the three-pipe indoor units to be started are controlled in a mixed starting mode according to the control of the three-pipe indoor units and the two-pipe indoor units mentioned in the foregoing embodiment. The three-control indoor unit to be started can be a three-control indoor unit which is closed before.
According to another embodiment of the present invention, as shown in fig. 3, the method for controlling a multi-split system further includes:
s4: in the process of controlling the starting of the two-control indoor unit on the basis of the started two-control indoor unit and the started three-control indoor unit, the opening degree of the throttling device of the started two-control indoor unit is controlled according to the outlet superheat degree of the started two-control indoor unit, the indoor main throttling device and the indoor auxiliary throttling device of the started three-control indoor unit are controlled to be closed, and the throttling devices of the started two-control indoor unit are controlled to be opened at the first opening degree.
That is to say, two control indoor units are additionally arranged on the basis of the started two control indoor units and the started three control indoor units, the opening degree of the throttle devices of the two started control indoor units is controlled according to the superheat degree of the outlets of the two started control indoor units, the indoor main throttle device and the indoor auxiliary throttle device of the three controlled indoor units are firstly closed to 0P, the fan of the three controlled indoor units is normally operated, and the opening degree of the supercooling throttle device of the outdoor unit is automatically adjusted according to the supercooling degree of the outdoor unit. Then, the throttle devices of the two-pipe indoor units to be started are controlled to be opened at the first opening degree, and the two-pipe indoor units to be started and the three-pipe indoor units to be started are controlled in a mixed starting mode according to the control of the three-pipe indoor units and the two-pipe indoor units mentioned in the foregoing embodiment. The three-control indoor unit to be started can be a three-control indoor unit which is closed before.
The control method of the multi-split system will be described with reference to the control schematic diagrams of fig. 4 to 6.
The first embodiment is as follows:
with reference to fig. 4, a specific process for controlling the three-pipe indoor unit and the two-pipe indoor unit to start in a mixed manner includes, after the multi-split system is started and the compressor is started, when the three-pipe indoor unit and the two-pipe indoor unit are started in a mixed manner, controlling the two-pipe indoor unit to run at 300P for 5min, in order to avoid the problem that the total opening degree of the throttle devices of the indoor units during starting is too large, and thus the super-cooling degree is more favorable for building the super-cooling degree, in the first 5min, the opening degrees of the main and auxiliary indoor throttle devices of the three-pipe indoor unit are both kept at 0P, meanwhile, the super-cooling throttle device of the outdoor unit runs at 0P for 60s, then runs at 56P for 60s, so that the indoor unit is quickly filled with refrigerant, then the outdoor unit with small opening degree is used to build the super-cooling, then the super-cooling throttle device of the outdoor unit is opened by the number of the, when 2 indoor units are opened, the supercooling throttling device of the outdoor unit is opened for 120s at 120P, and when the opening number of the indoor units is more than or equal to 3, the supercooling throttling device of the outdoor unit is opened for 120s at 200P. And then the opening degree of the supercooling throttling device of the outdoor unit is controlled according to the supercooling degree.
Meanwhile, within 5min after the compressor is started, the calculation frequency of the compressor is compared with 30Hz, when the calculation frequency is more than 30Hz, the compressor is controlled to operate according to the calculation frequency, and otherwise, the compressor is controlled to operate according to 30 Hz.
After 5min after the compressor is started, the two-control indoor unit enters PI control, an indoor main auxiliary throttling device of the started three-control indoor unit is started according to the time sequence in the figure 4, namely the started indoor main throttling device of the three-control indoor unit is firstly kept for 30s at 0P, then kept for 30s at 48P, then 8P is started every 30s until 96P is reached, then the indoor main throttling device enters PI control after being kept for 2min at 96P, the started indoor auxiliary throttling device of the three-control indoor unit is kept for 4min at 0P, then is started until the initial opening degree is kept for 1min, and then 8P is started every 30s until the second target opening degree is reached.
Example two:
with reference to fig. 5, the control flow for opening the two-control indoor unit on the basis of the opened three-control indoor unit is substantially the same as the control flow of the embodiment in fig. 4, except that the indoor main and auxiliary throttling device of the opened three-control indoor unit is first closed to 0P before the two-control indoor unit to be started is controlled to operate at 300P for 5 min. In addition, the fans of the three-pipe indoor unit are normally operated, and the fans of the outdoor unit and the throttling device of the subcooler are normally operated.
Example three:
with reference to fig. 6, the control flow for increasing the two-pipe indoor unit on the basis of the three-pipe indoor unit and the two-pipe indoor unit being turned on is substantially the same as the control flow of the embodiment in fig. 4, except that the opening degree of the throttling device of the turned-on two-pipe indoor unit is adjusted based on the outlet superheat degree of the turned-on two-pipe indoor unit, and the indoor main and auxiliary throttling devices of the turned-on three-pipe indoor unit are turned off to 0P before the turned-on two-pipe indoor unit is controlled to operate at 300P for 5 min. In addition, the fans of the three-pipe indoor unit are normally operated, and the fans of the outdoor unit and the throttling device of the subcooler are normally operated.
In summary, according to the control method of the multi-split air conditioning system provided by the embodiment of the present invention, in the process of controlling the start-up of the three-pipe indoor unit and the two-pipe indoor unit in a mixed manner, the throttle devices of the two-pipe indoor unit to be started up are controlled to be opened at the first opening degree, the indoor main throttle device and the indoor auxiliary throttle device of the three-pipe indoor unit to be started up are controlled to be kept closed, and the opening degree of the supercooling throttle device of the outdoor unit is controlled to be gradually increased, so that the abnormal sound of the start-up of the three-pipe indoor unit and the two-pipe indoor unit in the mixed manner is effectively suppressed.
In order to realize the embodiment, the invention further provides a multi-split system.
Fig. 7 is a block diagram schematically illustrating a multi-split system according to an embodiment of the present invention. As shown in fig. 7, the multi-split system includes: the outdoor unit 100, a plurality of indoor units 200, and a control module 300.
The indoor units 200 include at least one three-pipe indoor unit 200A and at least one two-pipe indoor unit 200B, each three-pipe indoor unit 200A is connected to a liquid pipe, a high-low pressure pipe and an air pipe of the outdoor unit 100, and each two-pipe indoor unit 200B is connected to a liquid pipe and an air pipe of the outdoor unit 100; the control module 300 is configured to determine a starting manner of an indoor unit of the multi-split air-conditioning system, control the throttling devices of the two started indoor units 200B to be opened at a first opening degree in a process of controlling the three-pipe indoor unit 200A and the two indoor units 200B to be started in a mixed manner, and control the main indoor throttling device and the auxiliary indoor throttling device of the three-pipe indoor unit 200A to be closed until a preset opening time is reached, and control the opening degrees of the main indoor throttling device and the auxiliary indoor throttling device of the three-pipe indoor unit 200A to be started to be gradually increased.
According to an embodiment of the present invention, the control module 300 is further configured to, in a process of controlling the two-pipe indoor unit 200B to start based on the three-pipe indoor unit 200A that has started, control the indoor main throttling device and the indoor auxiliary throttling device of the three-pipe indoor unit 200A that have started to close, and control the throttling devices of the two-pipe indoor unit 200B that have started to open at the first opening degree.
According to an embodiment of the present invention, the control module 300 is further configured to, in the process of controlling the two-managed indoor unit 200B to start based on the two-managed indoor unit and the three-managed indoor unit 200A that have started, control the opening degree of the throttling devices of the two-managed indoor unit 200B that has started according to the outlet superheat degree of the two-managed indoor unit 200B that has started, control the indoor main throttling device and the indoor auxiliary throttling device of the three-managed indoor unit 200A that have started to close, and control the throttling devices of the two-managed indoor unit 200B that has started to open at the first opening degree.
It should be noted that the foregoing explanation of the embodiment of the control method of the multi-split system is also applicable to the multi-split system of the embodiment, and is not repeated here.
According to the multi-split system provided by the embodiment of the invention, in the process of controlling the mixed starting of the three-control indoor unit and the two-control indoor unit, the control module controls the throttle devices of the two-control indoor unit to be started to be opened at the first opening degree, and controls the main indoor throttle device and the auxiliary indoor throttle device of the three-control indoor unit to be kept closed until the preset opening time is reached, and controls the opening degrees of the main indoor throttle device and the auxiliary indoor throttle device of the three-control indoor unit to be gradually increased, so that the mixed starting abnormal sound of the three-control indoor unit and the two-control indoor unit is effectively inhibited, and the user experience is improved.
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.
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.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
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. 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.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. 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 (11)

1. The control method of the multi-split system is characterized in that the multi-split system comprises an outdoor unit and a plurality of indoor units, the indoor units comprise at least one three-pipe indoor unit and at least one two-pipe indoor unit, each three-pipe indoor unit is connected with a liquid pipe, a high-low pressure pipe and an air pipe of the outdoor unit, and each two-pipe indoor unit is connected with a liquid pipe and an air pipe of the outdoor unit, and the method comprises the following steps:
determining a starting mode of an indoor unit of the multi-split system;
in the process of controlling the mixed starting of the three-control indoor unit and the two-control indoor unit, the throttle devices of the two-control indoor unit to be started are controlled to be opened at a first opening degree, the indoor main throttle device and the indoor auxiliary throttle device of the three-control indoor unit to be started are controlled to be kept closed, and the opening degrees of the indoor main throttle device and the indoor auxiliary throttle device of the three-control indoor unit to be started are controlled to be gradually increased until the preset opening time is reached.
2. The method of controlling a multi-split system as set forth in claim 1, further comprising:
and in the process of controlling the starting of the two-control indoor unit on the basis of the started three-control indoor unit, controlling the indoor main throttling device and the indoor auxiliary throttling device of the started three-control indoor unit to be closed, and controlling the throttling devices of the two started three-control indoor units to be opened at a first opening degree.
3. The method of controlling a multi-split system as set forth in claim 1, further comprising:
in the process of controlling the starting of the two-control indoor unit on the basis of the starting of the two-control indoor unit and the starting of the three-control indoor unit, the opening degree of the throttling device of the started two-control indoor unit is controlled according to the superheat degree of the outlet of the started two-control indoor unit, the closing of the indoor main throttling device and the indoor auxiliary throttling device of the started three-control indoor unit is controlled, and the opening of the throttling devices of the started two-control indoor unit is controlled to be in the first opening degree.
4. The control method of a multi-split system as claimed in any one of claims 1 to 3, wherein, when controlling throttle devices of two managed indoor units to be activated to be opened at a first opening degree, the method further comprises:
and controlling the opening degree of the supercooling throttling device of the outdoor unit to be gradually increased.
5. The method of controlling a multi-split system as set forth in claim 4, wherein the controlling of the opening degree of the supercooling throttling means of the outdoor unit to be gradually increased comprises:
controlling a supercooling throttling device of the outdoor unit to be closed for a first preset time;
controlling the supercooling throttling device of the outdoor unit to be opened at a second opening degree and continue for a second preset time;
determining to open a third opening according to the opening number of the indoor units, and controlling the supercooling throttling device of the outdoor unit to be opened at the third opening for a third preset time;
and adjusting the opening degree of the supercooling throttling device of the outdoor unit according to the supercooling degree of the outdoor unit.
6. The method for controlling a multi-split system according to claim 4, wherein the controlling of the gradually increasing opening degree of the indoor main throttling device of the to-be-activated three-pipe indoor unit comprises:
controlling the indoor main throttling device of the started three-pipe indoor unit to be closed for a fourth preset time;
controlling the indoor main throttling device of the to-be-started three-pipe indoor unit to be opened at a fifth opening degree and continue for a fifth preset time;
controlling the indoor main throttling device of the to-be-started three-pipe indoor unit to increase a sixth preset opening degree every sixth preset time until the first target opening degree is reached;
and after the first target opening degree is kept for a seventh preset time, adjusting the opening degree of an indoor main throttling device of the to-be-started three-pipe indoor unit according to the outlet superheat degree of the to-be-started three-pipe indoor unit.
7. The method for controlling a multi-split system according to claim 4, wherein the controlling of the opening degree of the indoor auxiliary throttling device of the to-be-activated three-pipe indoor unit to be gradually increased includes:
controlling the indoor auxiliary throttling device of the started three-pipe indoor unit to be closed and lasting for an eighth preset time;
controlling the indoor auxiliary throttling device of the to-be-started three-pipe indoor unit to be opened at the initial opening degree and continue for a ninth preset time;
and controlling the indoor auxiliary throttling device of the started three-pipe indoor unit to increase the sixth preset opening degree every sixth preset time until the second target opening degree is reached.
8. The control method of a multi-split system as claimed in any one of claims 1 to 3, wherein, when controlling the throttle devices of the two managed indoor units to be activated to be opened at the first opening degree, the compressor is further controlled to be frequency limited so that the operating frequency of the compressor is greater than the first operating frequency.
9. A multiple on-line system, comprising:
an outdoor unit;
the indoor units comprise at least one three-pipe indoor unit and at least one two-pipe indoor unit, each three-pipe indoor unit is connected with a liquid pipe, a high-low pressure pipe and an air pipe of the outdoor unit, and each two-pipe indoor unit is connected with the liquid pipe and the air pipe of the outdoor unit;
and the control module is used for determining the starting mode of the indoor unit of the multi-split system, controlling the throttle devices of the two started indoor units to be opened at a first opening degree in the process of controlling the mixed starting of the three-control indoor unit and the two-control indoor unit, controlling the main indoor throttle device and the auxiliary indoor throttle device of the three-control indoor unit to be closed, and controlling the opening degrees of the main indoor throttle device and the auxiliary indoor throttle device of the three-control indoor unit to be gradually increased until the preset opening time is reached.
10. The multi-split system as claimed in claim 9, wherein the control module is further configured to, in a process of controlling the two-controlled indoor units to be started based on the started three-controlled indoor unit, control the indoor main throttling device and the indoor auxiliary throttling device of the started three-controlled indoor unit to be closed, and control the throttling devices of the two started controlled indoor units to be opened at the first opening degree.
11. The multi-split system as claimed in claim 9, wherein the control module is further configured to, in a process of controlling the two-pipe indoor unit to be started based on the two-pipe indoor unit and the three-pipe indoor unit being started, control an opening degree of a throttling device of the two-pipe indoor unit being started according to an outlet superheat degree of the two-pipe indoor unit being started, control an indoor main throttling device and an indoor auxiliary throttling device of the three-pipe indoor unit being started to be closed, and control a throttling device of the two-pipe indoor unit being started to be opened at a first opening degree.
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