CN107525318B - Multi-split system and control method and device thereof - Google Patents

Multi-split system and control method and device thereof Download PDF

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Publication number
CN107525318B
CN107525318B CN201710831475.9A CN201710831475A CN107525318B CN 107525318 B CN107525318 B CN 107525318B CN 201710831475 A CN201710831475 A CN 201710831475A CN 107525318 B CN107525318 B CN 107525318B
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compressors
compressor
running time
time
minimum
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CN107525318A (en
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易德波
何俊飞
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Midea Group Co Ltd
GD Midea Heating and Ventilating Equipment Co Ltd
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Midea Group Co Ltd
GD Midea Heating and Ventilating Equipment Co Ltd
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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
    • 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
    • F25B49/022—Compressor control arrangements
    • 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
    • F25B31/00—Compressor arrangements
    • 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/07—Details of compressors or related parts
    • F25B2400/075—Details of compressors or related parts with parallel compressors
    • 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/07—Details of compressors or related parts
    • F25B2400/077—Compressor control units, e.g. terminal boxes, mounted on the compressor casing wall containing for example starter, protection switches or connector contacts
    • 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
    • F25B2500/06—Damage
    • 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
    • F25B2600/00—Control issues
    • F25B2600/01—Timing
    • 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
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/025—Compressor control by controlling speed
    • F25B2600/0251—Compressor control by controlling speed with on-off operation

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

The invention discloses a multi-split system and a control method and a control device thereof, wherein the multi-split system comprises a plurality of compressors which are connected in parallel, and the control method comprises the following steps: acquiring the accumulated running time of each compressor at preset intervals; acquiring a maximum operation time and a minimum operation time of a plurality of accumulated operation times according to the accumulated operation time of each compressor; judging whether a wheel value switching condition is met or not according to the maximum running time and the minimum running time; and if the wheel value switching condition is met, the starting sequence of the compressor corresponding to the minimum running time is arranged at the head, so that the wheel value switching is carried out on the plurality of compressors, and the running times of the plurality of compressors tend to be balanced. According to the method provided by the invention, the running time of the plurality of compressors tends to be balanced, and the condition that the accumulated running time of one or a plurality of compressors is too long is avoided, so that the service life of the whole machine can be prolonged.

Description

Multi-split system and control method and device thereof
Technical Field
The present invention relates to the field of a multi-split system, and in particular, to a method for controlling a multi-split system, a non-transitory computer-readable storage medium, a device for controlling a multi-split system, and a multi-split system.
Background
For commercial multi-split air-conditioning systems, due to the large operating load coverage, the external unit usually employs a multi-compressor design, for example, 2 to 3 compressors are disposed in the external unit. Only a single compressor or two compressors are needed to be started under the condition of low load, and a larger number of compressors can be started along with the increase of the load. In the design service life of the multi-split system, an unbalanced condition that the running time of part of the compressors is too long and the running time of the rest compressors is short may exist, and thus the service life of the whole system may be shortened.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the art described above. Therefore, an object of the present invention is to provide a method for controlling a multi-split system, which can balance the operation times of a plurality of compressors, and avoid the situation that the accumulated operation time of one or some compressors is too long, thereby prolonging the service life of the whole multi-split system.
A second object of the invention is to propose a non-transitory computer-readable storage medium.
A third object of the present invention is to provide a control apparatus for 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 control method for a multi-split system, where the multi-split system includes a plurality of compressors connected in parallel, and the control method includes: acquiring the accumulated running time of each compressor at preset intervals; acquiring a maximum operation time and a minimum operation time of a plurality of accumulated operation times according to the accumulated operation time of each compressor; judging whether a wheel value switching condition is met or not according to the maximum running time and the minimum running time; and if the round value switching condition is met, the starting sequence of the compressor corresponding to the minimum running time is arranged at the head, so that the running times of the plurality of compressors tend to be balanced by round value switching of the plurality of compressors.
According to the control method of the multi-split system, the accumulated running time of each compressor is obtained at intervals of the preset time, whether the wheel value switching condition is met or not is judged according to the obtained maximum accumulated running time and the minimum accumulated running time, and when the wheel value switching condition is met, the starting sequence of the compressor corresponding to the minimum running time is arranged at the head to realize the wheel value switching of the compressors, so that the starting sequence of the compressors can be adjusted at intervals of the preset time according to the accumulated running time of each compressor, the running times of the compressors tend to be balanced, the condition that the accumulated running time of one or more compressors is too long is avoided, and the service life of the whole machine can be prolonged.
In addition, the control method of the multi-split system proposed by the above embodiment of the present invention may further have the following additional technical features:
specifically, the determining whether a round value switching condition is satisfied according to the maximum running time and the minimum running time includes: judging whether the ratio of the maximum operation time to the minimum operation time is greater than or equal to a preset threshold value or not; and if the ratio is greater than or equal to the preset threshold, judging that the round value switching condition is met.
Further, the method for controlling a multi-split system further includes: acquiring a default starting sequence of the plurality of compressors; determining A compressors which are sequentially arranged in front of the compressor corresponding to the minimum running time according to the default starting sequence, and determining a last compressor which is arranged at the last position according to the default starting sequence; and when the round value switching condition is met, sequentially arranging the starting sequence of the A compressors behind the last compressor so as to carry out round value switching on the plurality of compressors, wherein A is a non-negative integer.
According to one embodiment of the invention, the preset time is 0.5N years, where N is a positive integer.
To achieve the above object, a second aspect of the present invention provides a non-transitory computer-readable storage medium having a computer program stored thereon, where the computer program is executed by a processor to implement the control method of the multi-split air-conditioning system according to the first aspect of the present invention.
According to the non-transitory computer readable storage medium of the embodiment of the invention, the stored computer program is executed, so that the starting sequence of the plurality of compressors can be adjusted according to the accumulated running time of each compressor every preset time interval, the running times of the plurality of compressors tend to be balanced, the condition that the accumulated running time of one or more compressors is too long is avoided, and the service life of the whole multi-split system can be prolonged.
In order to achieve the above object, a third aspect of the present invention provides a control device for a multi-split system, where the multi-split system includes a plurality of compressors connected in parallel, and the control device includes: the first acquisition module is used for acquiring the accumulated running time of each compressor every preset time interval; a second obtaining module for obtaining a maximum operation time and a minimum operation time of the plurality of accumulated operation times according to the accumulated operation time of each compressor; the judging module is used for judging whether a wheel value switching condition is met according to the maximum running time and the minimum running time; and the control module is used for arranging the starting sequence of the compressor corresponding to the minimum running time at the head when the wheel value switching condition is met so as to switch the wheel values of the plurality of compressors and enable the running times of the plurality of compressors to tend to be balanced.
According to the control device of the multi-split system, the accumulated running time of each compressor is obtained at intervals of the preset time, whether the wheel value switching condition is met or not is judged according to the obtained maximum accumulated running time and the minimum accumulated running time, and when the wheel value switching condition is met, the starting sequence of the compressor corresponding to the minimum running time is arranged at the head to realize the wheel value switching of the compressors, so that the starting sequence of the compressors can be adjusted at intervals of the preset time according to the accumulated running time of each compressor, the running times of the compressors tend to be balanced, the condition that the accumulated running time of one or more compressors is too long is avoided, and the service life of the whole machine can be prolonged.
In addition, the control device of the multi-split system according to the above embodiment of the present invention may further have the following additional technical features:
specifically, the determining module is configured to determine whether a ratio between the maximum operation time and the minimum operation time is greater than or equal to a preset threshold, and determine that the round value switching condition is satisfied when the ratio is greater than or equal to the preset threshold.
Further, the control device of the multi-split system further includes: and the third acquisition module is used for acquiring the default starting sequence of the plurality of compressors, determining that the A compressors are sequentially arranged before the compressor corresponding to the minimum running time according to the default starting sequence, and determining that the last compressor is arranged at the last position according to the default starting sequence, and the control module is used for sequentially arranging the starting sequence of the A compressors behind the last compressor when the wheel value switching condition is met so as to switch the wheel values of the plurality of compressors, wherein A is a non-negative integer.
According to one embodiment of the invention, the preset time is 0.5N years, where N is a positive integer.
In order to achieve the above object, a fourth aspect of the present invention provides a multi-split system including a control device of the multi-split system according to the third aspect of the present invention.
According to the multi-split system provided by the embodiment of the invention, the starting sequence of the plurality of compressors can be adjusted according to the accumulated running time of each compressor at preset time intervals, so that the running times of the plurality of compressors tend to be balanced, the condition that the accumulated running time of one or some compressors is too long is avoided, and the service life of the whole machine can be prolonged.
Drawings
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 flowchart of a control method of a multi-split system according to an embodiment of the present invention;
fig. 3 is a schematic diagram of two compressor wheel value switching in a multi-split system according to an embodiment of the present invention;
fig. 4 is a schematic diagram of three compressor wheel value switching in a multi-split system according to an embodiment of the present invention;
fig. 5 is a block diagram schematically illustrating a control apparatus of a multi-split system according to an embodiment of the present invention;
fig. 6 is a block diagram schematically illustrating a control apparatus of 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, a control method thereof, and an apparatus thereof according to embodiments of the present invention are described below with reference to the accompanying drawings.
The multi-split system of the embodiment of the invention comprises a plurality of compressors, wherein the compressors are connected in parallel, namely the air inlets of the compressors are connected together, and the air outlets of the compressors are connected together. The multi-split system has a standby state and an operating state when being started, wherein in the standby state, all the compressors are stopped, and in the operating state, at least one compressor in the compressors is started to operate. In the operation state, the operation load of the multi-split system can be increased by gradually increasing the number of the compressor starting operations.
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, a method for controlling a multi-split system according to an embodiment of the present invention includes the following steps:
and S1, acquiring the accumulated running time of each compressor at preset time intervals.
In one embodiment of the present invention, the preset time may be 0.5N years, where N is a positive integer. The accumulated running time of the compressor is obtained by accumulating the running time of the compressor after each start after the multi-split system leaves a factory.
After the multi-split air-conditioning system is started for the first time after leaving a factory, the accumulated running time of each compressor can be acquired every 0.5N year, so that the running mode of the multi-split air-conditioning system in the next 0.5N year can be controlled according to the acquired accumulated running time of each compressor.
And S2, acquiring a maximum operation time and a minimum operation time of the plurality of accumulated operation times according to the accumulated operation time of each compressor.
After acquiring the accumulated operation time of each compressor, the acquired accumulated operation times may be compared to obtain a maximum value and a minimum value, i.e., a maximum operation time and a minimum operation time, among the accumulated operation times, respectively.
And S3, judging whether the wheel value switching condition is met according to the maximum operation time and the minimum operation time.
Specifically, it may be determined whether a ratio between the maximum operation time and the minimum operation time is greater than or equal to a preset threshold, and if the ratio is greater than or equal to the preset threshold, it is determined that the round value switching condition is satisfied.
And S4, if the wheel value switching condition is met, arranging the starting sequence of the compressor corresponding to the minimum operation time at the head to switch the wheel values of the plurality of compressors so as to balance the operation times of the plurality of compressors.
It should be understood that when the ratio between the maximum operation time and the minimum operation time is greater than or equal to the preset threshold, the maximum operation time is relatively too high, i.e., the cumulative operation time of the compressor corresponding to the maximum operation time is relatively too long, and the minimum operation time is relatively too low, i.e., the cumulative operation time of the compressor corresponding to the minimum operation time is relatively too short.
In this case, the number of the compressors may be switched in turns, that is, the starting sequence of the compressors may be adjusted in the next 0.5N year.
Specifically, the starting sequence of the compressor corresponding to the minimum operation time may be arranged at the head, so that the compressor corresponding to the minimum operation time is started first when the multi-split air-conditioning system enters the operation state next time. And in 0.5N year after the round value is switched, starting the compressor corresponding to the minimum running time at first when the multi-split air conditioning system enters the running state each time.
According to the control method of the multi-split system, the accumulated running time of each compressor is obtained at intervals of the preset time, whether the wheel value switching condition is met or not is judged according to the obtained maximum accumulated running time and the minimum accumulated running time, and when the wheel value switching condition is met, the starting sequence of the compressor corresponding to the minimum running time is arranged at the head to realize the wheel value switching of the compressors, so that the starting sequence of the compressors can be adjusted at intervals of the preset time according to the accumulated running time of each compressor, the running times of the compressors tend to be balanced, the condition that the accumulated running time of one or more compressors is too long is avoided, and the service life of the whole machine can be prolonged.
Further, the method for controlling a multi-split system according to the embodiment of the present invention may further include: acquiring a default starting sequence of a plurality of compressors; determining A compressors which are sequentially arranged in front of the compressor corresponding to the minimum running time according to a default starting sequence, and determining a last compressor which is arranged at the last position according to the default starting sequence; and when the wheel value switching condition is met, sequentially arranging the starting sequence of the A compressors behind the last compressor so as to switch the wheel values of the plurality of compressors, wherein A is a non-negative integer. The default starting sequence can be a factory-set starting sequence of the multi-online system.
Therefore, the starting sequence of the compressor corresponding to the minimum operation time can be arranged at the head, and other compressors except the compressor corresponding to the minimum operation time can be started and sequenced according to the default starting sequence of the plurality of compressors.
In an embodiment of the present invention, as shown in fig. 2, the control method of the online system may include the following steps:
and S101, operating the multi-split system in factory default settings. The multi-split air conditioning system comprises m compressors, and the factory default setting can comprise a default starting sequence of the m compressors and the like. More specifically, one of the m compressors may be set as a master compressor, and the remaining compressors may be slave compressors, and the slave compressors may also be set as a slave 1 compressor, a slave 2 compressor, and the like in a default starting order.
S102, counting the accumulated running time t1 to tm of the m compressors in the X year. The m compressors may be numbered in advance, for example, in the default starting order numbered 1 to m, and the corresponding accumulated operation times are t1 to tm, respectively. Wherein X is a positive integer multiple of 0.5.
S103, a maximum value max (t1, …, tm) among t1 through tm is acquired, and a minimum value min (t1, …, tm) among t1 through tm is acquired.
S104, judging whether max (t1, …, tm)/min (t1, …, tm) ≥ RT. Wherein R isTIs a preset threshold value which is preset according to the actual adjustment requirement of the starting sequence of the plurality of compressorsSetting is carried out first. If yes, executing step S105; if not, step S108 is performed.
And S105, performing round value switching on the m compressors. If the result of the step S104 is judged to be yes and the multi-split system is in the operating state, the shift value switching operation is performed when the multi-split system enters the standby state and enters the operating state again. Specifically, the m compressors numbered 1 to m in the default starting sequence include the compressor corresponding to min (t1, …, tm), the number of which is a +1, and the starting sequence of the compressor numbered a +1 is arranged at the top, that is, the compressor numbered a +1 is switched to the main compressor, and then the compressors numbered a +2, a +3, …, m, 1, 2, …, a-1, a are sequentially started.
That is, if m compressors numbered 1 to m are arranged from left to right, the start sequence after the operation of performing the round value switching is: starting the compressors corresponding to min (t1, … and tm) from left to right in sequence, starting the rightmost compressor, then starting the next started compressor as the leftmost compressor, and starting the leftmost compressor from left to right in sequence. In X years after the round switch, the m compressors can be started and operated according to the adjusted starting sequence.
S106, counting the accumulated running time t1 to tm of the m compressors in the nX year. Wherein n is an integer greater than 1.
S107, the maximum value max (t1, …, tm) among t1 through tm is acquired, and the minimum value min (t1, …, tm) among t1 through tm is acquired. And then returns to step S104.
And S108, keeping the current starting sequence unchanged. That is, if the round value switching condition is not satisfied, the current startup order is maintained unchanged.
In one embodiment of the present invention, as shown in fig. 3, the multi-split system includes two compressors, i.e., m 2, of an electronic control box 1, an electronic control box 2, and INV1 and INV 2. In this embodiment, the switching of the first wheel value of the INV1 start sequence and the first wheel value of the INV2 start sequence can be performed. Specifically, if default INV1 has sequence number 1, INV2 has sequence number 2, and the operation time of INV1 is long and the operation time of INV2 is short in nX year, the sequence number of INV2 may be switched to 1 and the sequence number of INV1 may be switched to 2 in the next X year, i.e. INV2 is started first and INV1 is started later. Then, if the operation time of the INV2 is longer and the operation time of the INV1 is shorter in (n +1) X years, the sequential number of the INV1 may be switched to 1 and the sequential number of the INV2 may be switched to 2 in the next X years, i.e., the INV1 is started first and the INV2 is started later.
In an embodiment of the present invention, as shown in fig. 4, the multi-split system includes three compressors, i.e., m 3, of an electronic control box 1, an electronic control box 2, an electronic control box 3, and INV1, INV2, and INV 3. In this embodiment, the switching of the first power on sequence of INV1, the first power on sequence of INV2, and the first power on sequence of INV3 may be performed. Specifically, if default INV1 has sequence number 1, INV2 has sequence number 2, INV3 has sequence number 3, and the operating time of INV3 is shortest in nX year, the sequence number of INV3 may be switched to 1 and the sequence number of INV1 may be switched to 2 in the next X year, and the sequence number of INV3 may be switched to 3, i.e., INV3 is started first, INV1 is started later, and INV2 is started last. Then, if the running time of the INV2 is shortest in (n +1) X years, the sequence number of the INV2 can be switched to 1, the sequence number of the INV3 can be switched to 2, and the sequence number of the INV1 can be switched to 3 in the next X years, i.e., the INV2 is started first, the INV3 is started later, and the INV1 is started last. Then, if the running time of the INV1 is shortest in (n +2) X years, the sequence number of the INV1 can be switched to 1, the sequence number of the INV2 can be switched to 2, and the sequence number of the INV3 can be switched to 3 in the next X years, i.e., the INV1 is started first, the INV2 is started later, and the INV3 is started last.
Therefore, when the multi-split system comprises two or three compressors connected in parallel, the two or three compressors can be controlled to perform wheel value switching according to the accumulated running time of each compressor, so that the running times of the two or three compressors can be balanced.
The invention also provides a non-transitory computer readable storage medium corresponding to the above embodiment.
A non-transitory computer-readable storage medium of an embodiment of the present invention, on which a computer program is stored, which, when executed by a processor, can implement the control method of a multi-split system proposed in the above-described embodiment of the present invention.
According to the non-transitory computer readable storage medium of the embodiment of the invention, the stored computer program is executed, so that the starting sequence of the plurality of compressors can be adjusted according to the accumulated running time of each compressor every preset time interval, the running times of the plurality of compressors tend to be balanced, the condition that the accumulated running time of one or more compressors is too long is avoided, and the service life of the whole multi-split system can be prolonged.
The invention further provides a control device of the multi-split system, which corresponds to the embodiment.
As shown in fig. 5, the control apparatus of a multi-split system according to an embodiment of the present invention includes a first obtaining module 10, a second obtaining module 20, a determining module 30, and a control module 40.
The first obtaining module 10 is configured to obtain an accumulated running time of each compressor every preset time interval; the second obtaining module 20 is configured to obtain a maximum operation time and a minimum operation time of the plurality of accumulated operation times according to the accumulated operation time of each compressor; the judging module 30 is configured to judge whether a round value switching condition is satisfied according to the maximum running time and the minimum running time; the control module 40 is configured to, when the duty switching condition is satisfied, arrange the start sequence of the compressor corresponding to the minimum operation time at the head to perform duty switching on the plurality of compressors, so that the operation times of the plurality of compressors tend to be balanced.
In one embodiment of the present invention, the preset time may be 0.5N years, where N is a positive integer. The accumulated running time of the compressor is obtained by accumulating the running time of the compressor after each start by the first obtaining module 10 after the multi-split system leaves the factory.
After the multi-split air-conditioning system is first started after leaving the factory, the first obtaining module 10 may obtain the accumulated operation time of each compressor every 0.5N years, so as to control the operation mode of the multi-split air-conditioning system in the next 0.5N year according to the obtained accumulated operation time of each compressor.
After acquiring the accumulated operation time of each compressor, the second acquisition module 20 may compare the acquired plurality of accumulated operation times to obtain a maximum value and a minimum value, i.e., a maximum operation time and a minimum operation time, among the plurality of accumulated operation times, respectively.
The determining module 30 may determine whether a ratio between the maximum operation time and the minimum operation time is greater than or equal to a preset threshold, and determine that the duty switching condition is satisfied when the ratio is greater than or equal to the preset threshold.
It should be understood that when the ratio between the maximum operation time and the minimum operation time is greater than or equal to the preset threshold, the maximum operation time is relatively too high, i.e., the cumulative operation time of the compressor corresponding to the maximum operation time is relatively too long, and the minimum operation time is relatively too low, i.e., the cumulative operation time of the compressor corresponding to the minimum operation time is relatively too short.
At this time, the control module 40 may perform a round switch for the plurality of compressors, i.e., adjust the starting sequence of the plurality of compressors within the next 0.5N year.
Specifically, the control module 40 may arrange the start sequence of the compressor corresponding to the minimum operation time at the head, so as to start the compressor corresponding to the minimum operation time first when the multi-split air-conditioning system enters the operation state next time. And in 0.5N year after the round value is switched, starting the compressor corresponding to the minimum running time at first when the multi-split air conditioning system enters the running state each time.
According to the control device of the multi-split system, the accumulated running time of each compressor is obtained at intervals of the preset time, whether the wheel value switching condition is met or not is judged according to the obtained maximum accumulated running time and the minimum accumulated running time, and when the wheel value switching condition is met, the starting sequence of the compressor corresponding to the minimum running time is arranged at the head to realize the wheel value switching of the compressors, so that the starting sequence of the compressors can be adjusted at intervals of the preset time according to the accumulated running time of each compressor, the running times of the compressors tend to be balanced, the condition that the accumulated running time of one or more compressors is too long is avoided, and the service life of the whole machine can be prolonged.
Further, as shown in fig. 6, the control apparatus of a multi-split system according to an embodiment of the present invention may further include a third obtaining module 50, where the third obtaining module 50 is configured to obtain a default starting sequence of the plurality of compressors, determine a compressors that are sequentially arranged before the compressor corresponding to the minimum running time according to the default starting sequence, and determine a last compressor that is arranged at a last position according to the default starting sequence. The control module 40 is configured to sequentially arrange the starting sequence of the a compressors after the last compressor when the round value switching condition is satisfied, so as to perform round value switching on the plurality of compressors, where a is a non-negative integer. The default starting sequence can be a factory-set starting sequence of the multi-online system.
Therefore, the starting sequence of the compressor corresponding to the minimum operation time can be arranged at the head, and other compressors except the compressor corresponding to the minimum operation time can be started and sequenced according to the default starting sequence of the plurality of compressors.
The invention further provides a multi-split system corresponding to the embodiment.
The multi-split system according to the embodiment of the present invention includes the control device of the multi-split system according to the above embodiment of the present invention, and the specific implementation manner of the multi-split system may refer to the above embodiment.
According to the multi-split system provided by the embodiment of the invention, the starting sequence of the plurality of compressors can be adjusted according to the accumulated running time of each compressor at preset time intervals, so that the running times of the plurality of compressors tend to be balanced, the condition that the accumulated running time of one or some compressors is too long is avoided, and the service life of the whole machine can be prolonged.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the 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 one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined 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; either directly or indirectly through intervening media, either internally or in any other relationship. 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 (8)

1. A control method of a multi-split air conditioning system, wherein the multi-split air conditioning system includes a plurality of compressors connected in parallel, the control method comprising the steps of:
acquiring the accumulated running time of each compressor at preset intervals;
acquiring a maximum operation time and a minimum operation time of a plurality of accumulated operation times according to the accumulated operation time of each compressor;
judging whether a wheel value switching condition is met or not according to the maximum running time and the minimum running time;
if the round value switching condition is met, arranging the starting sequence of the compressor corresponding to the minimum running time at the head to carry out round value switching on the plurality of compressors so as to enable the running times of the plurality of compressors to tend to be balanced;
judging whether a wheel value switching condition is met according to the maximum running time and the minimum running time, wherein the judging step comprises the following steps:
judging whether the ratio of the maximum operation time to the minimum operation time is greater than or equal to a preset threshold value or not;
and if the ratio is greater than or equal to the preset threshold, judging that the round value switching condition is met.
2. The method of controlling a multi-split system as set forth in claim 1, further comprising:
acquiring a default starting sequence of the plurality of compressors;
determining A compressors which are sequentially arranged in front of the compressor corresponding to the minimum running time according to the default starting sequence, and determining a last compressor which is arranged at the last position according to the default starting sequence;
and when the round value switching condition is met, sequentially arranging the starting sequence of the A compressors behind the last compressor so as to carry out round value switching on the plurality of compressors, wherein A is a non-negative integer.
3. The method of controlling a multi-split system as claimed in claim 1, wherein the preset time is 0.5N years, where N is a positive integer.
4. A non-transitory computer-readable storage medium on which a computer program is stored, characterized in that the program, when executed by a processor, implements a control method of a multi-split system according to any one of claims 1 to 3.
5. A control apparatus of a multi-split system, the multi-split system including a plurality of compressors connected in parallel, the control apparatus comprising:
the first acquisition module is used for acquiring the accumulated running time of each compressor every preset time interval;
a second obtaining module for obtaining a maximum operation time and a minimum operation time of the plurality of accumulated operation times according to the accumulated operation time of each compressor;
the judging module is used for judging whether a wheel value switching condition is met according to the maximum running time and the minimum running time;
the control module is used for arranging the starting sequence of the compressor corresponding to the minimum running time at the head when the wheel value switching condition is met so as to switch the wheel values of the plurality of compressors and enable the running times of the plurality of compressors to tend to be balanced;
the judging module is used for judging whether the ratio between the maximum operation time and the minimum operation time is greater than or equal to a preset threshold value or not, and judging that the wheel value switching condition is met when the ratio is greater than or equal to the preset threshold value.
6. The control device of a multi-split system as set forth in claim 5, further comprising:
a third obtaining module, configured to obtain a default starting sequence of the plurality of compressors, determine a compressors that are sequentially arranged before the compressor corresponding to the minimum running time according to the default starting sequence, and determine a last compressor that is arranged at a last position according to the default starting sequence,
and the control module is used for sequentially arranging the starting sequence of the A compressors behind the last compressor when the round value switching condition is met so as to carry out round value switching on the plurality of compressors, wherein A is a non-negative integer.
7. The control device of a multi-split system as claimed in claim 5, wherein the preset time is 0.5N years, where N is a positive integer.
8. A multi-split system, characterized by comprising a control device of a multi-split system according to any one of claims 5 to 7.
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