CN113883683A - Control method for multi-split air conditioning unit - Google Patents
Control method for multi-split air conditioning unit Download PDFInfo
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- CN113883683A CN113883683A CN202111145474.1A CN202111145474A CN113883683A CN 113883683 A CN113883683 A CN 113883683A CN 202111145474 A CN202111145474 A CN 202111145474A CN 113883683 A CN113883683 A CN 113883683A
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 45
- 239000007788 liquid Substances 0.000 claims description 9
- 230000003247 decreasing effect Effects 0.000 claims description 7
- 230000006872 improvement Effects 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 2
- 239000003921 oil Substances 0.000 description 69
- 230000000694 effects Effects 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 239000010687 lubricating oil Substances 0.000 description 3
- 239000003507 refrigerant Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/54—Control or safety arrangements characterised by user interfaces or communication using one central controller connected to several sub-controllers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
Abstract
The invention relates to the technical field of air conditioners, and particularly provides a control method for a multi-split air conditioning unit. The multi-split air conditioning unit aims to solve the problem that the oil bias problem among compressors of the existing multi-split air conditioning unit is difficult to effectively solve. Therefore, the multi-split air conditioning unit comprises a plurality of compressor branches arranged in parallel, wherein the compressor branches are provided with a compressor, an oil separator and an oil valve, and the control method comprises the following steps: after the multi-split air conditioning unit operates for a first preset time, controlling the preset operation parameters of one part of compressors to be improved and controlling the preset operation parameters of the other part of compressors to be reduced; after the second preset time, recovering the preset operation parameters of all the compressors; after the third preset time period, controlling the preset operation parameters of one part of compressors to be reduced and controlling the preset operation parameters of the other part of compressors to be improved; and after the fourth preset time, recovering the preset operation parameters of all the compressors, and further ensuring the oil quantity balance of the multi-split air conditioning unit.
Description
Technical Field
The invention relates to the technical field of air conditioners, and particularly provides a control method for a multi-split air conditioning unit.
Background
The multi-split air conditioning unit generally adopts a multi-module parallel connection mode, and has the advantages of energy conservation, convenient maintenance, low operation cost and the like, but the mode is limited by installation structures such as long pipelines, large fall and the like, and the air conditioning unit often has the problems of difficult oil return, partial oil among compressors and the like. Particularly, after the multi-split air conditioning unit operates for a long time, the problem of unbalanced oil quantity among compressors of the multi-split air conditioning unit occurs, and the operation stability of the whole multi-split air conditioning unit is further influenced.
Based on the above problems, the existing multi-split air conditioning unit mainly adopts the modes of setting an oil content capillary tube to cross oil balancing, attaching an oil balancing tube to a compressor and the like to solve the problem of oil deviation between compressors, and the modes not only need to adjust the unit structure, thereby resulting in the improvement of cost, but also have poor oil balancing efficiency, and further resulting in the problem of oil deviation between compressors being difficult to effectively solve.
Disclosure of Invention
The invention aims to solve the technical problem that the oil deviation problem among the compressors of the existing multi-split air conditioning unit is difficult to effectively solve.
The invention provides a control method for a multi-split air conditioning unit, wherein the multi-split air conditioning unit comprises a plurality of compressor branches arranged in parallel, and the compressor branches are provided with a compressor, an oil separator and an oil valve, and the control method comprises the following steps:
after the multi-split air conditioning unit operates for a first preset time, controlling the preset operation parameters of one part of compressors to be improved and controlling the preset operation parameters of the other part of compressors to be reduced;
after the second preset time, recovering the preset operation parameters of all the compressors;
after a third preset time period, controlling the preset operation parameters of one part of compressors to be reduced and controlling the preset operation parameters of the other part of compressors to be improved;
and after the fourth preset time, recovering the preset operation parameters of all the compressors.
In a preferred technical solution of the above control method, the preset operation parameter is an operation capacity or an operation frequency of the compressor.
In a preferred technical solution of the above control method, the compressor branch includes a first compressor branch and a second compressor branch, wherein the first compressor branch is provided with a first compressor, a first oil separator and a first oil valve, the second compressor branch is provided with a second compressor, a second oil separator and a second oil valve,
the step of controlling the preset operation parameters of one part of compressors to be improved and the preset operation parameters of the other part of compressors to be reduced after the multi-split air conditioning unit operates for the first preset time specifically comprises the following steps:
after the multi-split air conditioning unit operates for the first preset time, controlling the preset operation parameters of the first compressor to be increased and controlling the preset operation parameters of the second compressor to be reduced;
the step of recovering the preset operation parameters of all the compressors after the second preset time period specifically comprises the following steps:
after the second preset time period, restoring the preset operation parameters of the first compressor and the second compressor;
the step of controlling the preset operation parameters of one part of compressors to be reduced and the preset operation parameters of the other part of compressors to be improved after the third preset time period includes:
after the third preset duration, controlling the preset operation parameter of the first compressor to be reduced and controlling the preset operation parameter of the second compressor to be improved;
the step of recovering the preset operation parameters of all the compressors after the fourth preset time period specifically comprises the following steps:
and after the fourth preset time period, restoring the preset operation parameters of the first compressor and the second compressor.
In a preferred technical solution of the control method, the step of controlling the preset operation parameter of the first compressor to be increased and the preset operation parameter of the second compressor to be decreased after the multi-split air conditioning unit operates for the first preset time period specifically includes:
after the multi-split air conditioning unit operates for the first preset time, controlling the operating capacity of the first compressor to be increased and controlling the operating capacity of the second compressor to be reduced;
the step of recovering the preset operation parameters of the first compressor and the second compressor after the second preset time period includes:
after the second preset time period, recovering the operating capacities of the first compressor and the second compressor;
the step of controlling the reduction of the preset operation parameter of the first compressor and the improvement of the preset operation parameter of the second compressor after the third preset time period includes:
after the third preset time period, controlling the running capacity of the first compressor to be reduced and controlling the running capacity of the second compressor to be increased;
the step of recovering the preset operation parameters of the first compressor and the second compressor after the fourth preset time period includes:
and after the fourth preset time period, recovering the operating capacities of the first compressor and the second compressor.
In a preferred technical solution of the control method, the step of controlling the operating capacity of the first compressor to be increased and the operating capacity of the second compressor to be decreased after the multi-split air conditioning unit operates for the first preset time period specifically includes:
after the multi-split air conditioning unit operates for the first preset time, controlling the operating capacity of the first compressor to increase by a first preset percentage and controlling the operating capacity of the second compressor to decrease by the first preset percentage;
the step of controlling the operation capacity of the first compressor to be decreased and the operation capacity of the second compressor to be increased after the third preset time period includes:
after the third preset duration, controlling the operating capacity of the first compressor to reduce by a second preset percentage and controlling the operating capacity of the second compressor to increase by the second preset percentage.
In a preferable embodiment of the above control method, a reference capacity of the first compressor is equal to a reference capacity of the second compressor, and the first preset percentage is equal to the second preset percentage.
In a preferable technical solution of the above control method, the first preset percentage is 30%, and the second preset percentage is 30%.
In the preferable technical scheme of the control method, the multi-split air conditioning unit further comprises a gas-liquid separator and a one-in two-out three-way valve,
the outlet of the gas-liquid separator is communicated with the inlets of the first inlet three-way valve and the second outlet three-way valve, the first outlet of the first inlet three-way valve and the first outlet of the second inlet three-way valve are communicated with the first compressor branch, and the second outlet of the first inlet three-way valve and the second outlet of the second outlet three-way valve are communicated with the second compressor branch.
In a preferred embodiment of the above control method, the control method further includes:
and under the condition that the compressor needs to be stopped, closing the oil valve corresponding to the compressor in advance.
In a preferred technical solution of the above control method, a check valve is further provided on the compressor branch.
Under the condition of adopting the technical scheme, the multi-split air conditioning unit comprises a plurality of compressor branches which are arranged in parallel, wherein the compressor branches are provided with a compressor, an oil separator and an oil valve, and the control method comprises the following steps: after the multi-split air conditioning unit operates for a first preset time, controlling the preset operation parameters of one part of compressors to be improved and controlling the preset operation parameters of the other part of compressors to be reduced; after the second preset time, recovering the preset operation parameters of all the compressors; after a third preset time period, controlling the preset operation parameters of one part of compressors to be reduced and controlling the preset operation parameters of the other part of compressors to be improved; and after the fourth preset time, recovering the preset operation parameters of all the compressors. Based on the control mode, the control method provided by the invention can realize the effect of alternative oil return only by controlling the preset operation parameters of each compressor without additionally arranging an additional oil balancing component, so that the problem of oil deviation and even oil shortage caused by different oil output rates of the compressors is effectively reduced, and the oil quantity balance of the multi-split air conditioning unit is further effectively ensured.
Drawings
Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:
FIG. 1 is a flow chart of the main steps of the control method of the present invention;
fig. 2 is a partial structural schematic view of a multi-split air conditioning unit according to the present invention;
FIG. 3 is a flow chart of the specific steps of a preferred embodiment of the control method of the present invention;
FIG. 4 is a schematic diagram of the compressor control process of the present invention;
FIG. 5 is a schematic illustration of the oil valve control process of the present invention;
reference numerals:
11. a first compressor branch; 111. a first compressor; 112. a first oil separator; 113. a first oil valve; 114. a first check valve; 115. a first oil return capillary tube;
12. a second compressor branch; 121. a second compressor; 122. a second oil separator; 123. a second oil valve; 124. a second one-way valve; 125. a second oil return capillary;
13. a gas-liquid separator;
14. one-in two-out three-way valve.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. And can be adjusted as needed by those skilled in the art to suit particular applications.
It should be noted that in the description of the preferred embodiment, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In addition, in the description of the present invention, unless otherwise explicitly specified or limited, the term "connected" is to be understood broadly, and may be, for example, directly connected, indirectly connected through an intermediate, or communicating between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. Although the steps of the control method of the present invention are described herein in a particular order, the order is not limiting and those skilled in the art can perform the steps in a different order without departing from the basic principles of the invention.
Referring first to fig. 1, a flow chart of main steps of the control method of the present invention is shown. As shown in fig. 1, the control method of the present invention mainly includes the following steps:
s1: after the multi-split air conditioning unit operates for a first preset time, controlling the preset operation parameters of one part of compressors to be improved and controlling the preset operation parameters of the other part of compressors to be reduced;
s2: after the second preset time, recovering the preset operation parameters of all the compressors;
s3: after the third preset time period, controlling the preset operation parameters of one part of compressors to be reduced and controlling the preset operation parameters of the other part of compressors to be improved;
s4: and after the fourth preset time, recovering the preset operation parameters of all the compressors.
Firstly, it should be noted that, the present invention does not impose any limitation on the specific type of the preset operation parameter, and as a preferred setting mode, the preset operation parameter is the operation capacity of the compressor or the operation frequency of the compressor, so as to effectively ensure the oil balancing effect. In addition, the invention does not limit the specific adjustment range of the preset operation parameters, and technicians can set the adjustment range according to actual use requirements.
Secondly, it should be noted that the invention does not limit the initial set value of the preset operation parameter, and the technician can set the operation parameter according to the actual use requirement; in addition, the specific values of the first preset time length, the second preset time length, the third preset time length and the fourth preset time length are not limited, and technicians can set the values according to actual use requirements.
Based on the control mode, the alternating oil return effect can be realized by controlling the preset operation parameters of the compressors without additionally arranging an additional oil equalizing component, so that the problem of oil deviation and even oil shortage caused by different oil discharge rates of the compressors of different specifications is effectively reduced, and the oil quantity balance of the multi-split air conditioning unit is effectively ensured.
The multi-split air conditioning unit comprises an outdoor unit and a plurality of indoor units connected with the outdoor unit through a refrigerant circulation loop, wherein an indoor coil and an indoor fan are arranged in each indoor unit so as to exchange heat with an indoor environment; the outdoor unit is internally provided with an outdoor coil pipe, an outdoor fan, an electronic expansion valve and a plurality of variable frequency compressors, and a refrigerant continuously circulates between the indoor coil pipe and the outdoor coil pipe through the refrigerant circulation loop to realize heat exchange. It should be noted that, the present invention does not limit the specific structure of the multi-split air conditioning unit, and technicians may set the specific number of the indoor units and the specific types of the heat exchange elements according to actual needs.
Further, refer to fig. 2, which is a partial structural schematic diagram of a multi-split air conditioning unit according to the present invention. As shown in fig. 2, in the preferred embodiment, the number of the compressors is two, and the specific arrangement is as follows: the multi-split air conditioning unit comprises a first compressor branch 11 and a second compressor branch 12 which are arranged in parallel, wherein the first compressor branch 11 is provided with a first compressor 111, a first oil separator 112, a first oil valve 113, a first check valve 114 and a first oil return capillary tube 115, and the first oil valve 113 and the first check valve 114 are respectively positioned on two sides of the first oil separator 112; the second compressor branch 12 is provided with a second compressor 121, a second oil separator 122, a second oil valve 123, a second check valve 124 and a second oil return capillary 125, wherein the second oil valve 123 and the second check valve 124 are respectively located at two sides of the second oil separator 122. It should be noted that, although the multi-split air conditioning unit described in the preferred embodiment is provided with only two compressor branches, this is not limiting, and a technician may set the specific number of the compressor branches according to actual use requirements.
Further, the multi-split air conditioning unit further comprises a gas-liquid separator 13 and a two-in and two-out three-way valve 14, wherein an outlet of the gas-liquid separator 13 is communicated with inlets of the two-in and two-out three-way valve 14, a first outlet of the one-in and two-out three-way valve 14 is communicated with the first compressor branch 11, and a second outlet of the one-in and two-out three-way valve 14 is communicated with the second compressor branch 12. According to the invention, the effect of uniform liquid distribution can be better realized through the arrangement of the one-in and two-out three-way valves 14, so that the balance of oil quantity is further effectively ensured. In addition, it should be noted that the present invention does not limit any specific type of the gas-liquid separator 13 and the one-in-two-out three-way valve 14, and the skilled person can set the type according to the actual use requirement.
In addition, the multi-split air conditioning unit further comprises a controller, and the controller can control the operation state of the multi-split air conditioning unit, such as the operation parameters of each compressor, the opening and closing state of an oil valve and the like. It can be understood by those skilled in the art that the present invention does not limit the specific structure and type of the controller, and the controller may be the original controller of the multi-split air conditioning unit, or may be a controller separately configured to execute the control method of the present invention, and the structure and type of the controller may be set by a technician according to actual use requirements.
Referring next to fig. 3, a flowchart illustrating specific steps of a preferred embodiment of the control method of the present invention is shown. Based on the multi-split air conditioning unit described in the above preferred embodiment, the preferred embodiment of the control method of the present invention specifically includes the following steps:
s101: after the multi-split air conditioning unit operates for a first preset time, controlling the operating capacity of the first compressor to increase by a first preset percentage and controlling the operating capacity of the second compressor to decrease by the first preset percentage;
s102: after a second preset time period, recovering the operating capacities of the first compressor and the second compressor;
s103: after a third preset duration, controlling the operating capacity of the first compressor to reduce by a second preset percentage and controlling the operating capacity of the second compressor to increase by the second preset percentage;
s104: and after the fourth preset time period, restoring the operating capacities of the first compressor and the second compressor.
Specifically, in step S101, after the multi-split air conditioning unit operates for the first preset time period, that is, immediately after the multi-split air conditioning unit starts to operate, the first compressor 111 and the second compressor 121 both operate at the set reference capacity, and the reference capacities of the first compressor 111 and the second compressor 121 are preferably equal to each other; of course, the invention does not limit the specific value of the reference capacity, and technicians can set the reference capacity according to actual use requirements. After the start-up operation is performed for the first preset time period, the controller controls the operation capacity of the first compressor 111 to increase by the first preset percentage, and controls the operation capacity of the second compressor 121 to decrease by the first preset percentage. It should be noted that, the specific values of the first preset duration and the first preset percentage are not limited in any way, and a technician can set the values according to actual use requirements.
In addition, it should be noted that, although the preset operation parameter adopted in the preferred embodiment is the operation capacity of the compressor, this is only a preferred selection manner, and a technician may also select other operation parameters, such as the operation frequency, according to the actual use requirement; the change does not depart from the basic principle of the invention, and the change only needs to realize the effect of alternative oil return and belongs to the protection scope of the invention.
Further, in step S102, after the second preset time period elapses, the controller may restore the operation capacities of the first compressor 111 and the second compressor 121, that is, restore the operation capacities of the first compressor 111 and the second compressor 121 to the reference capacity, so as to effectively ensure the heat exchange effect of the multi-split air conditioning unit. It should be further noted that, the specific value of the second preset time period is not limited in the present invention, and the technical staff may set the time period according to the actual use requirement.
Further, in step S103, after the third preset time period elapses, that is, after the duration of the time for the operating capacities of the first compressor 111 and the second compressor 121 to return to the reference capacities reaches the third preset time period, the controller controls the operating capacity of the first compressor 111 to decrease by the second preset percentage and controls the operating capacity of the second compressor 121 to increase by the second preset percentage. In addition, it should be noted that, in the present invention, no limitation is imposed on specific values of the third preset duration and the second preset percentage, and a technician may set the values according to actual use requirements.
Referring next to fig. 4, a schematic diagram of the compressor control process of the present invention is shown. As shown in fig. 4, the abscissa represents time, the ordinate represents operation capacity, the bent portion of the line corresponding to the air conditioning unit represents the time when the unit is turned on, and the operation capacities of the first compressor 111 and the second compressor 121 tend to be stable after the unit is turned on and increase. Further, a line segment between the first dashed line and the second dashed line represents the adjustment process corresponding to step S101, that is, the operation capacity of the first compressor 111 is increased by the first preset percentage, and the operation capacity of the second compressor 121 is decreased by the first preset percentage; a line segment between the third dotted line and the fourth dotted line represents the adjustment process corresponding to step S103, that is, the operating capacity of the first compressor 111 is decreased by the second preset percentage, and the operating capacity of the second compressor 121 is increased by the second preset percentage.
In addition, it should be noted that, the present invention does not limit the adjustment range of the operation capacity of the first compressor 111 and the second compressor 121, and the skilled person can set the adjustment range according to the actual use requirement as long as the alternative oil return can be realized. As a preferable setting, the first preset percentage is equal to the second preset percentage, and the first preset percentage is 30% and the second preset percentage is 30%.
Finally, in step S104, after the fourth preset time period elapses, the controller may restore the operation capacities of the first compressor 111 and the second compressor 121, that is, restore the operation capacities of the first compressor 111 and the second compressor 121 to the reference capacity, so as to further effectively ensure the heat exchange effect of the multi-split air conditioning unit. It should be further noted that, the present invention does not limit the specific value of the fourth preset time period, and the technical staff can set the value according to the actual use requirement.
In addition, the control method of the present invention further comprises the following control logic: under the condition that a certain compressor needs to be stopped, the stopping time of the compressor is not limited, and technicians can set the stopping time according to actual use requirements; the controller can control in advance and close with the oil valve that this compressor corresponds the setting to store a certain amount of lubricating oil in the oil separator that corresponds the setting with this compressor, thereby effectively avoid this compressor to appear lacking oil problem when the start next, and then effectively guarantee the stability of unit operation.
Referring finally to fig. 5, a schematic of the oil valve control process of the present invention is shown. As shown in fig. 5, the abscissa represents time, and the ordinate represents the open-closed state, i.e., the upwardly convex portion of the line segment represents the open state. It can be seen that the opening timings of the first compressor 111 and the first oil valve 113 are the same, whereas the closing timing of the first oil valve 113 is earlier than the stop timing of the first compressor 111, so as to store a certain amount of lubricating oil in the first oil separator 112; the opening timings of the second compressor 121 and the second oil valve 123 are the same, but the closing timing of the second oil valve 123 is earlier than the stop timing of the second compressor 121, so that a certain amount of lubricating oil is stored in the second oil separator 122.
Based on the control mode, the oil supply system of the multi-split air conditioning unit can be optimized from multiple angles such as the oil discharge rate, the oil return and the oil balancing of the compressor, so that the oil deviation problem of the compressor is effectively avoided, and the oil quantity balance is further effectively ensured.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. A control method for a multi-split air conditioning unit is characterized in that the multi-split air conditioning unit comprises a plurality of compressor branches arranged in parallel, a compressor, an oil separator and an oil valve are arranged on each compressor branch, and the control method comprises the following steps:
after the multi-split air conditioning unit operates for a first preset time, controlling the preset operation parameters of one part of compressors to be improved and controlling the preset operation parameters of the other part of compressors to be reduced;
after the second preset time, recovering the preset operation parameters of all the compressors;
after a third preset time period, controlling the preset operation parameters of one part of compressors to be reduced and controlling the preset operation parameters of the other part of compressors to be improved;
and after the fourth preset time, recovering the preset operation parameters of all the compressors.
2. The control method of claim 1, wherein the preset operation parameter is an operation capacity or an operation frequency of a compressor.
3. The control method according to claim 1, wherein the compressor branch includes a first compressor branch and a second compressor branch, wherein a first compressor, a first oil separator, and a first oil valve are provided on the first compressor branch, and a second compressor, a second oil separator, and a second oil valve are provided on the second compressor branch,
the step of controlling the preset operation parameters of one part of compressors to be improved and the preset operation parameters of the other part of compressors to be reduced after the multi-split air conditioning unit operates for the first preset time specifically comprises the following steps:
after the multi-split air conditioning unit operates for the first preset time, controlling the preset operation parameters of the first compressor to be increased and controlling the preset operation parameters of the second compressor to be reduced;
the step of recovering the preset operation parameters of all the compressors after the second preset time period specifically comprises the following steps:
after the second preset time period, restoring the preset operation parameters of the first compressor and the second compressor;
the step of controlling the preset operation parameters of one part of compressors to be reduced and the preset operation parameters of the other part of compressors to be improved after the third preset time period includes:
after the third preset duration, controlling the preset operation parameter of the first compressor to be reduced and controlling the preset operation parameter of the second compressor to be improved;
the step of recovering the preset operation parameters of all the compressors after the fourth preset time period specifically comprises the following steps:
and after the fourth preset time period, restoring the preset operation parameters of the first compressor and the second compressor.
4. The control method according to claim 3, wherein the step of controlling the preset operation parameter of the first compressor to be increased and the preset operation parameter of the second compressor to be decreased after the multi-split air conditioning unit operates for the first preset time period specifically comprises:
after the multi-split air conditioning unit operates for the first preset time, controlling the operating capacity of the first compressor to be increased and controlling the operating capacity of the second compressor to be reduced;
the step of recovering the preset operation parameters of the first compressor and the second compressor after the second preset time period includes:
after the second preset time period, recovering the operating capacities of the first compressor and the second compressor;
the step of controlling the reduction of the preset operation parameter of the first compressor and the improvement of the preset operation parameter of the second compressor after the third preset time period includes:
after the third preset time period, controlling the running capacity of the first compressor to be reduced and controlling the running capacity of the second compressor to be increased;
the step of recovering the preset operation parameters of the first compressor and the second compressor after the fourth preset time period includes:
and after the fourth preset time period, recovering the operating capacities of the first compressor and the second compressor.
5. The control method according to claim 4, wherein the step of controlling the operating capacity of the first compressor to increase and the operating capacity of the second compressor to decrease after the multi-split air conditioning unit operates for the first preset time period specifically comprises:
after the multi-split air conditioning unit operates for the first preset time, controlling the operating capacity of the first compressor to increase by a first preset percentage and controlling the operating capacity of the second compressor to decrease by the first preset percentage;
the step of controlling the operation capacity of the first compressor to be decreased and the operation capacity of the second compressor to be increased after the third preset time period includes:
after the third preset duration, controlling the operating capacity of the first compressor to reduce by a second preset percentage and controlling the operating capacity of the second compressor to increase by the second preset percentage.
6. The control method according to claim 5, characterized in that the reference capacity of the first compressor and the reference capacity of the second compressor are equal, the first preset percentage being equal to the second preset percentage.
7. The control method according to claim 6, characterized in that said first preset percentage is 30% and said second preset percentage is 30%.
8. The control method according to any one of claims 3 to 7, wherein the multi-split air conditioning unit further comprises a gas-liquid separator and a one-in-two-out three-way valve,
the outlet of the gas-liquid separator is communicated with the inlets of the first inlet three-way valve and the second outlet three-way valve, the first outlet of the first inlet three-way valve and the first outlet of the second inlet three-way valve are communicated with the first compressor branch, and the second outlet of the first inlet three-way valve and the second outlet of the second outlet three-way valve are communicated with the second compressor branch.
9. The control method according to any one of claims 1 to 7, characterized by further comprising:
and under the condition that the compressor needs to be stopped, closing the oil valve corresponding to the compressor in advance.
10. The control method according to any one of claims 1 to 7, characterized in that a check valve is further provided on the compressor branch.
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| CN202111145474.1A CN113883683B (en) | 2021-09-28 | 2021-09-28 | Control method for multi-split air conditioning unit |
| PCT/CN2022/091697 WO2023050820A1 (en) | 2021-09-28 | 2022-05-09 | Control method for multi-split air conditioning unit |
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| CN202111145474.1A CN113883683B (en) | 2021-09-28 | 2021-09-28 | Control method for multi-split air conditioning unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023050820A1 (en) * | 2021-09-28 | 2023-04-06 | 青岛海尔中央空调有限公司 | Control method for multi-split air conditioning unit |
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| WO2023050820A1 (en) | 2023-04-06 |
| CN113883683B (en) | 2024-01-19 |
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