CN115076934A - Multi-connected air conditioner heating standby internal unit control method and device and multi-connected air conditioner - Google Patents
Multi-connected air conditioner heating standby internal unit control method and device and multi-connected air conditioner Download PDFInfo
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 87
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- 238000004781 supercooling Methods 0.000 claims abstract description 146
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- 230000000694 effects Effects 0.000 description 13
- 230000008569 process Effects 0.000 description 6
- 238000004378 air conditioning Methods 0.000 description 5
- 238000009825 accumulation Methods 0.000 description 4
- 230000036760 body temperature Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
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- 230000003238 somatosensory effect Effects 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
- F24F11/62—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
- F24F11/65—Electronic processing for selecting an operating mode
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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
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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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
- F24F2130/00—Control inputs relating to environmental factors not covered by group F24F2110/00
- F24F2130/40—Noise
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
- F24F2140/12—Heat-exchange fluid pressure
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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Abstract
The invention discloses a method and a device for controlling a heating standby internal machine of a multi-connected air conditioner and the multi-connected air conditioner, and relates to the technical field of air conditioners, wherein the method for controlling the heating standby internal machine of the multi-connected air conditioner comprises the following steps: in the heating process of the multi-connected air conditioner, monitoring the outdoor environment temperature, and setting corresponding target high-pressure according to the outdoor environment temperature; judging whether a preset heat load interval is reached or not based on the outdoor environment temperature, and if so, detecting the actual supercooling degree of the standby internal machine; and determining the valve adjusting rate according to the deviation amount of the supercooling degree of the actual supercooling degree and the target supercooling degree, and controlling the expansion valve corresponding to the standby internal machine based on the valve adjusting rate. The invention realizes the fine control of the supercooling degree of the heating standby inner machine, enables the supercooling degree of the standby inner machine to change stably, reduces the airflow sound or the liquid flow sound of the refrigerant and further reduces the noise of the air conditioner.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a method and a device for controlling a heating standby internal machine of a multi-connected air conditioner and the multi-connected air conditioner.
Background
At present, when a multi-split air conditioner heats, an indoor unit without heating requirement is also called as a standby indoor unit, the standby indoor unit needs to have a certain flow rate, and the problem that the refrigerant shortage of an air conditioning system causes a fault due to the accumulation of the refrigerant is avoided.
Disclosure of Invention
In order to solve the problems, the invention provides a control method and device for a heating standby inner machine of a multi-connected air conditioner and the multi-connected air conditioner, which can enable the supercooling degree of the standby inner machine to be stably changed, reduce the airflow sound or liquid flow sound of a refrigerant and further reduce the noise of the air conditioner.
According to an embodiment of the present invention, in one aspect, a method for controlling a multi-connected air conditioner heating standby internal unit is provided, including: monitoring the outdoor environment temperature in the heating process of the multi-connected air conditioner, and setting corresponding target high-pressure according to the outdoor environment temperature; judging whether a preset heat load interval is reached or not based on the outdoor environment temperature, and if so, detecting the actual supercooling degree of the standby internal machine; and determining the valve adjusting rate according to the deviation amount of the supercooling degree of the actual supercooling degree and the target supercooling degree, and controlling the expansion valve corresponding to the standby indoor unit based on the valve adjusting rate.
By adopting the technical scheme, the target high-pressure is set according to the detected outdoor environment temperature, the sub-scene control of the target high pressure is realized, the heating effect is ensured, when the air conditioner heat load demand is higher, the valve adjusting speed of the expansion valve corresponding to the standby indoor unit is controlled according to the deviation amount of the actual supercooling degree and the target supercooling degree, the fine control of the supercooling degree of the standby indoor unit is realized, the supercooling degree of the standby indoor unit is stably changed, the air flow sound or the liquid flow sound of a refrigerant is reduced, and the air conditioner noise is further reduced.
Preferably, the step of determining a valve adjusting rate according to the deviation amount of the supercooling degree between the actual supercooling degree and the target supercooling degree, and controlling the expansion valve corresponding to the standby indoor unit based on the valve adjusting rate includes: calculating the difference value between the actual supercooling degree and the target supercooling degree to obtain the supercooling degree deviation value; when the supercooling degree deviation amount is greater than or equal to zero, determining a valve adjusting time interval according to the supercooling degree deviation amount, and controlling the opening degree of the expansion valve corresponding to the standby internal machine to periodically increase the preset opening degree at the valve adjusting time interval; wherein the valve timing interval is inversely related to the subcooling deviation amount.
By adopting the technical scheme, the valve adjusting time interval is reduced when the supercooling degree deviation value is increased, the valve adjusting speed of the expansion valve is gradually increased, the phenomenon that the supercooling degree of the accumulated liquid of the standby indoor unit is increased due to the fact that the expansion valve of the standby indoor unit is adjusted too slowly is prevented, meanwhile, the phenomenon that the refrigerant flow of the pipeline suddenly changes to form refrigerant noise due to the fact that the expansion valve of the standby indoor unit is adjusted too slowly is prevented through the gradually increased valve adjusting speed, and the reliability of refrigerant flow control is improved.
Preferably, the control method of the multi-connected air conditioner heating standby internal unit further includes: and when the supercooling degree deviation amount is less than zero, controlling the opening degree of an expansion valve corresponding to the standby internal machine to be periodically reduced based on the target supercooling degree.
By adopting the technical scheme, when the supercooling degree of the multi-connected air conditioner is insufficient, the opening degree of the expansion valve corresponding to the standby indoor unit is controlled to be periodically reduced so as to reduce the flow rate of the refrigerant, increase the supercooling degree, realize the stable change of the supercooling degree of the standby indoor unit and reduce the noise of the refrigerant.
Preferably, the step of determining whether the preset heat load interval is reached based on the outdoor environment temperature includes: the method comprises the steps of determining to reach the preset heat load interval when the outdoor environment temperature is detected to be in a (Ta4, Ta 3) interval or a first-time detected outdoor environment temperature is in a (Ta3, Ta 2) or (Ta2, Ta1] interval, or determining to reach the preset heat load interval when the outdoor environment temperature is reduced from the (Ta3, Ta 2) interval to the (Ta4, Ta3] interval, or determining to reach the preset heat load interval when the outdoor environment temperature is increased from the (Ta3, Ta 2) interval to the (Ta2, Ta 1) interval.
By adopting the technical scheme, when the outdoor environment temperature is in a higher temperature region or is transited to an adjacent temperature region from the higher temperature region, the preset heat load region is determined to be reached, so that the valve adjusting speed of the expansion valve is controlled when the air conditioner has higher heat load requirements, and the stable change of the supercooling degree of the heating standby indoor unit is reached.
Preferably, the control method of the multi-connected air conditioner heating standby internal machine further comprises: and when the outdoor environment temperature is higher than Ta1 or the outdoor environment temperature is reduced from higher than Ta1 to (Ta2, Ta 1), controlling the opening degree of the expansion valve corresponding to the standby indoor unit based on the target supercooling degree.
By adopting the technical scheme, when the outdoor environment temperature is high and the heat load demand is low, the opening degree of the expansion valve corresponding to the standby inner machine is controlled based on the target supercooling degree, the refrigerant of the heating standby inner machine is ensured to be in a single-phase liquid state, and airflow sound caused by turbulent flow in gas-liquid two-phase is avoided.
Preferably, the control method of the multi-connected air conditioner heating standby internal unit further includes: and when the outdoor environment temperature is less than or equal to Ta4, or when the outdoor environment temperature is increased from less than or equal to Ta4 to (Ta4, Ta 3), controlling the opening degree of the expansion valve corresponding to the standby indoor unit based on the target supercooling degree.
By adopting the technical scheme, when the multi-connected air conditioner is at ultralow temperature for heating, the opening degree of the expansion valve of the standby indoor unit is controlled according to the target supercooling degree, so that the normal operation of an air conditioning system is prevented from being influenced by the deposition of a refrigerant in the standby indoor unit, the heating effect of the indoor unit in other operation states is ensured, and the user experience is improved; by maintaining the control step under Ta4 when the outdoor environment temperature is changed from Ta4 of Tao or less to Ta3 of Ta4 or less, sudden change of the refrigerant flow caused by sudden switching of the valve adjusting rate control expansion valve is avoided, and stable control of the refrigerant flow is ensured.
Preferably, the step of setting a corresponding target high-pressure according to the outdoor environment temperature includes: the target high pressure is set to a first pressure when the outdoor ambient temperature is greater than Ta1, or when the outdoor ambient temperature is decreased from greater than Ta1 to (Ta2, Ta 1), the target high pressure is set to a second pressure when the preset heat load interval is reached based on the outdoor ambient temperature, the target high pressure is set to a third pressure when the outdoor ambient temperature is equal to or less than Ta4, or when the outdoor ambient temperature is increased from equal to or less than Ta4 to (Ta4, Ta 3), wherein the third pressure is greater than the first pressure and less than the second pressure.
By adopting the technical scheme, the target high-pressure is set according to the section and the variation trend of the outdoor environment temperature, so that the target high-pressure is set according to the use scene of the air conditioner, the heating effect of the air conditioner can be ensured, and the refrigerant noise of the heating standby indoor unit can be avoided.
According to an embodiment of the present invention, in another aspect, there is provided a multi-connected air conditioner heating standby internal unit control device, including: the setting module is used for monitoring the outdoor environment temperature in the heating process of the multi-connected air conditioner and setting the corresponding target high-pressure according to the outdoor environment temperature; the judging module is used for judging whether the outdoor environment temperature reaches a preset heat load interval or not based on the outdoor environment temperature, and if so, detecting the actual supercooling degree of the standby indoor unit; and the control module is used for determining the valve adjusting rate according to the deviation amount of the supercooling degree of the actual supercooling degree and the target supercooling degree and controlling the expansion valve corresponding to the standby indoor unit based on the valve adjusting rate.
According to an embodiment of the present invention, in another aspect, there is provided a multi-connected air conditioner, including a processor and a computer readable storage medium storing a computer program, where the computer program is read by the processor and executed by the processor, and the method according to any one of the first aspect is implemented.
According to an embodiment of the present invention, in another aspect, a computer-readable storage medium is provided, which stores a computer program, which when read and executed by a processor, implements the method according to any one of the first aspect.
The invention has the following beneficial effects: the target high-pressure sub-scene control is realized by setting the target high-pressure according to the detected outdoor environment temperature, the heating effect is ensured, when the air conditioner heat load demand is higher, the valve adjusting speed of the expansion valve corresponding to the standby indoor unit is controlled according to the deviation amount of the actual supercooling degree and the target supercooling degree, the fine control of the supercooling degree of the standby indoor unit is realized, the supercooling degree of the standby indoor unit is stably changed, the airflow sound or the liquid flow sound of a refrigerant is reduced, and the air conditioner noise is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
Fig. 1 is a flowchart of a control method for a heating standby internal unit of a multi-connected air conditioner according to the present invention;
fig. 2 is a schematic structural diagram of a multi-connected air conditioner provided by the present invention;
fig. 3 is a schematic structural diagram of a control device of a multi-connected air conditioner heating standby internal machine provided by the invention.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
At present, when a multi-connected air conditioner heats, the opening of an electronic expansion valve of an internal machine is kept standby for heating, and the opening is controlled according to a target supercooling degree within a certain opening range, so that the accumulation of a refrigerant is ensured, and the refrigerant is prevented from flowing too much. However, if the amount of refrigerant is too small, the refrigerant flow noise will be generated; if the amount of refrigerant is too much, the refrigerant flow noise will be present, and it is difficult to achieve the ideal state.
The embodiment provides a method for controlling a multi-connected air conditioner heating standby internal machine, which may be applied to a controller of a multi-connected air conditioner, referring to a flowchart of the method for controlling the multi-connected air conditioner heating standby internal machine shown in fig. 1, and the method mainly includes the following steps S102 to S106:
step S102: in the heating process of the multi-connected air conditioner, the outdoor environment temperature is monitored, and the corresponding target high-pressure is set according to the outdoor environment temperature.
Referring to fig. 2, the multi-connected air conditioner includes an outdoor unit 20 and a plurality of indoor units 21, and during heating, refrigerant passes through an outdoor unit air pipe pip, flows into the indoor unit air pipe pip, then to an indoor unit electronic expansion valve EVI, then to an indoor unit liquid pipe PiL, and then to an outdoor unit liquid pipe pip. If the standby inner machine electronic expansion valve is closed, the refrigerant flows into the indoor machine air pipe PiG through the outdoor air pipe and then flows into the indoor machine electronic expansion valve EVI to be deposited in the standby inner machine, so that the standby inner machine electronic expansion valve cannot be closed.
When the fact that the multi-connected air conditioner runs in a heating mode is detected, the outdoor environment temperature Tao is detected in real time based on a temperature sensor arranged in an outdoor unit, corresponding target high-pressure is set according to the outdoor environment temperature, when the outdoor environment temperature is high, the heat load requirement of the multi-connected air conditioner is small, the heat exchange requirement is small, and the heat exchange requirement of the air conditioner can be met by setting the low target high-pressure temperature; when the outdoor environment temperature is low, a high target high-pressure temperature needs to be set to meet the heat exchange requirement.
Step S104: and judging whether the temperature reaches a preset heat load interval or not based on the outdoor environment temperature, and if so, detecting the actual supercooling degree of the standby internal machine.
When the outdoor environment temperature is in a lower temperature range, the air conditioner is in a core area of heating requirements, the heat load requirements are higher, the fact that the multi-connected air conditioner reaches a preset heat load range is determined, the actual supercooling degree of the standby indoor unit is detected, and the actual supercooling degree Tsh is equal to the high-pressure corresponding saturation temperature Td-pipe outlet temperature TinL.
Step S106: and determining the valve adjusting rate according to the deviation amount of the supercooling degree of the actual supercooling degree and the target supercooling degree, and controlling the expansion valve corresponding to the standby internal machine based on the valve adjusting rate.
When the deviation amount of the supercooling degree is large, a large valve adjusting speed is set, and the phenomenon that the supercooling degree is increased due to liquid accumulation caused by too slow adjustment of an expansion valve of a standby internal machine is prevented; when the deviation amount of the supercooling degree is small, a small valve adjusting speed is set, the phenomenon that the flow rate of the refrigerant is suddenly changed to form refrigerant noise due to the fact that the expansion valve of the standby indoor unit is adjusted too fast is prevented, and the opening degree of the expansion valve corresponding to the standby indoor unit is controlled based on the valve adjusting speed, so that the refrigerant in the air-conditioning system basically reaches a stable state.
According to the control method for the standby indoor unit of the multi-connected air conditioner for heating, the target high-pressure is set according to the detected outdoor environment temperature, the sub-scene control of the target high pressure is achieved, the heating effect is guaranteed, when the air conditioner heat load demand is high, the valve adjusting speed of the expansion valve corresponding to the standby indoor unit is controlled according to the deviation amount of the actual supercooling degree and the target supercooling degree, the fine control of the supercooling degree of the standby indoor unit is achieved, the supercooling degree of the standby indoor unit is enabled to change stably, the airflow sound or the liquid flow sound of the refrigerant is reduced, and the air conditioner noise is reduced.
In an embodiment, the present embodiment provides a specific implementation manner of determining whether the preset thermal load interval is reached based on the outdoor environment temperature: the method comprises the steps of determining that a preset heat load interval is reached when the outdoor environment temperature is detected to be in a (Ta4, Ta 3) interval or a (Ta3, Ta 2) or (Ta2, Ta 1) interval for the first time, or determining that the preset heat load interval is reached when the outdoor environment temperature is reduced from the (Ta3, Ta 2) interval to the (Ta4, Ta 3) interval, or determining that the preset heat load interval is reached when the outdoor environment temperature is increased from the (Ta3, Ta 2) interval to the (Ta2, Ta 1) interval.
The Ta1 is in the range of 18 ℃ and 21 ℃, the Ta2 is in the range of 15 ℃ and 17 ℃, the Ta3 is in the range of-9 ℃ and-7 ℃, the Ta4 is in the range of-12 ℃ and-10 ℃, when the outdoor environment temperature is detected to be in the range of (Ta3 and Ta 2), or the outdoor environment temperature is detected to be in the range of (Ta4 and Ta 3) or the range of (Ta2 and Ta 1) for the first time, the outdoor environment temperature is low, the heat load requirement is large in the heating requirement core area, and the fact that the multi-connected air conditioner reaches the preset heat load range is determined, so that the valve adjusting speed of the expansion valve is controlled, and the phenomenon that the opening degree of the expansion valve is too fast or too slow is avoided.
When the transition interval is the (Ta2, Ta 1) interval and the (Ta4, Ta 3) interval, and the outdoor environment temperature is detected to be decreased from the (Ta3, Ta 2) interval to the (Ta4, Ta 3) interval or increased from the (Ta3, Ta 2) interval to the (Ta2, Ta 1) interval, in order to avoid noise caused by sudden change of the opening degree of the expansion valve, the preset thermal load interval is still determined to be met, so that the opening degree of the expansion valve of the standby internal machine is continuously controlled based on the valve adjusting rate.
In an embodiment, this embodiment provides an implementation manner of setting a corresponding target high-pressure and controlling an expansion valve according to an outdoor ambient temperature, which may be specifically executed with reference to the following steps (1) to (3):
step (1): when the outdoor ambient temperature is greater than Ta1, or when the outdoor ambient temperature is decreased from greater than Ta1 to (Ta2, Ta 1), the target high-pressure is set to the first pressure Pd1, and the opening degree of the expansion valve corresponding to the standby indoor unit is controlled based on the target supercooling degree.
Referring to a target high-pressure division table shown in the following table one, according to the following table one, when the outdoor environment temperature Tao is greater than Ta1, Ta1 belongs to [18 ℃ and 21 ℃), the outdoor environment temperature is higher and approaches to the somatosensory comfortable temperature of 25-27 ℃, the system heat load demand is small, the set target high-pressure is first pressure Pd1 and Pd1 belongs to [23bar and 25bar ], the corresponding saturation temperature is 38-41 ℃, is slightly higher than the human body temperature by 1-3 ℃, and the hot air perception is achieved, at the moment, the target high-pressure is low, the refrigerant flow speed of the air conditioning system is low, the refrigerant flowing sound of the heating standby indoor unit is small, the electronic expansion valve opening degree of the heating standby indoor unit is controlled according to the target supercooling degree. The value range of the target supercooling degree Ttar _ sh is generally (4 ℃, 7 ℃), so that the refrigerant of the internal machine in the heating standby state is in a single-phase liquid state, and airflow sound caused by turbulent flow in gas-liquid two-phase is avoided.
When the outdoor environment temperature is transited from Tao more than Ta1 to Ta2 more than Tao and less than or equal to Ta1, the control step of the interval of Tao more than Ta1 is maintained, namely the target high-pressure is set to be the first pressure Pd1, the opening of the expansion valve of the standby indoor unit is controlled based on the target supercooling degree, so that sudden change of the opening of the expansion valve is avoided, stable change of the supercooling degree of the heating standby indoor unit is achieved, and the noise of a refrigerant is reduced.
Meter-target high pressure dividing meter
Step (2): when it is determined that the preset heat load interval is reached based on the outdoor ambient temperature, the target high pressure is set to the second pressure Pd 2.
When the outdoor environment temperature meets Ta3 and Tao and Ta2, or Ta2 and Ta1 or Ta4 and Tao and Ta3 are detected and judged for the first time, the outdoor environment temperature is high and is in a heating demand core region, the heat load demand of the multi-connected air conditioner is high, the target high pressure is set to be Pd2, Pd2 belongs to [31bar, 33bar ], the corresponding saturation temperature is 50-53 ℃, the temperature is 13-15 ℃ higher than the temperature of a human body, the sensing is obvious, at the moment, the flow speed of a system is high, the flowing sound of a refrigerant of an indoor machine in a standby heating state is large, the valve adjusting speed is determined according to the supercooling degree deviation between the actual supercooling degree and the target supercooling degree, and the opening degree of an expansion valve corresponding to the indoor machine in the standby state is controlled based on the valve adjusting speed.
When the outdoor environment temperature is transited from Ta3 < Tao < Ta2 to Ta2 < Tao < Ta1 or Ta4 < Tao < Ta3, in order to avoid sudden change of the opening degree of the expansion valve, the opening degree of the expansion valve corresponding to the standby indoor unit is continuously controlled based on the valve adjusting rate. And when judging whether the temperature reaches the preset heat load interval based on the outdoor environment temperature for the first time, if the outdoor environment temperature meets the conditions that Ta2 is more than Tao and is less than or equal to Ta1 or Ta4 is more than Tao and is less than or equal to Ta3, controlling the opening degree of the expansion valve corresponding to the standby indoor unit based on the valve adjusting rate.
And (3): when the outdoor ambient temperature is equal to or lower than Ta4, or when the outdoor ambient temperature is increased from equal to or lower than Ta4 to (Ta4, Ta 3), the target high-pressure is set to the third pressure Pd3, and the opening degree of the expansion valve corresponding to the standby indoor unit is controlled based on the target supercooling degree.
Wherein the third pressure is greater than the first pressure and less than the second pressure. As shown in the first table, when the outdoor environment temperature Tao is less than or equal to Ta4, Ta4 belongs to-12 ℃ and-10 ℃, the multi-connected air conditioner is in an ultralow temperature heating area, and heating conditions generally exist, so that the heating requirement of the multi-connected unit is reduced, the corresponding saturation pressure is about 5bar, the target high pressure needs to be reduced in order to simultaneously consider the effect and the system reliability, the target high pressure is set to be the third pressure Pd3, the Pd3 belongs to 27bar and 29bar, the corresponding saturation temperature is 45-48 ℃, the saturation temperature is about 8-10 ℃ higher than the human body temperature, and sensing is obvious. At the moment, because the ambient temperature is low, the probability of people in the standby indoor unit is low, so the requirement on noise is not high, and the control can be carried out according to the target supercooling degree. Through when the multi-connected air conditioner is in ultra-low temperature heating, the expansion valve opening degree of the standby inner machine is controlled according to the target supercooling degree, normal operation of an air conditioning system is prevented from being influenced by refrigerant deposition in the standby inner machine, the heating effect of the inner machines in other running states is guaranteed, and user experience is improved.
As shown in the table I, when the outdoor environment temperature is transited from Tao not more than Ta4 to Ta4 < Tao not more than Ta3, the control step of keeping Tao not more than Ta4 is performed, namely, the target high pressure is set to be the third pressure Pd3, the opening degree of the expansion valve of the standby indoor unit is controlled according to the target supercooling degree, so that sudden change of the refrigerant flow caused by sudden switching of the valve adjusting rate to control the expansion valve is avoided, and the stable control of the refrigerant flow is ensured.
In an embodiment, the present embodiment provides an implementation manner that a valve adjusting rate is determined according to a deviation amount of a supercooling degree between an actual supercooling degree and a target supercooling degree, and an expansion valve corresponding to a standby internal machine is controlled based on the valve adjusting rate, which may be specifically executed with reference to the following steps 1) to 3):
step 1): and calculating the difference value between the actual supercooling degree and the target supercooling degree to obtain the supercooling degree deviation value.
And calculating the supercooling degree deviation amount delta T as the actual supercooling degree Tsh-the target supercooling degree Ttar _ sh.
Step 2): when the deviation amount of the supercooling degree is more than or equal to zero, determining the valve adjusting time interval according to the deviation amount of the supercooling degree, and controlling the opening degree of the expansion valve corresponding to the standby internal machine so as to periodically increase the preset opening degree at the valve adjusting time interval.
When the supercooling degree deviation amount 0 is less than or equal to delta T, determining the corresponding valve adjusting speed according to the interval where the supercooling degree deviation amount delta T is located, and controlling the opening degree of the expansion valve corresponding to the standby indoor unit to gradually increase according to the valve adjusting speed. The valve adjusting time interval is in negative correlation with the supercooling degree deviation amount, namely the larger the supercooling degree deviation amount is, the smaller the valve adjusting time interval is, and the larger the valve adjusting speed is. Through the valve speed of transferring of crescent increase expansion valve when the super-cooled degree deviation volume increases, prevent that the expansion valve of standby inner machine from adjusting and causing the inner machine hydrops increase super-cooled degree too slowly, simultaneously through gradually increasing the valve speed of transferring, prevent that the expansion valve of standby inner machine from adjusting and causing pipeline refrigerant flow sudden change to form the refrigerant noise too slowly, promoted refrigerant flow control's reliability.
In one embodiment, when 0 ≦ Δ T < p1, the modulation rate is set to increase by 1Pls per interval T1/2; when p1 is less than or equal to delta T and less than p2, setting the valve adjusting speed to be increased by 1Pls per T1/4 of time interval; when p2 is less than or equal to delta T < p3, setting the valve adjusting speed to be increased by 1Pls per T1/6 time interval; when p3 is more than or equal to delta T which is less than p4, setting the valve adjusting speed to be increased by 1Pls every T1/10 time interval; when p4 is less than or equal to delta T, the valve regulating speed is set to increase by 1Pls per T1/15 time interval. t1 ∈ [30s, 60s ], the expansion valve of the standby internal machine is adjusted in small steps by controlling the expansion valve to increase only 1Pls in each period, so that the supercooling degree is steadily increased, meanwhile, the noise generated by sudden change of refrigerant flow is reduced, the adjustment time interval of the expansion valve is shortened, and the phenomenon of liquid accumulation generated by too slow valve adjustment is prevented.
Step 3): and when the deviation amount of the supercooling degree is less than zero, controlling the opening degree of the expansion valve corresponding to the standby indoor unit to be periodically reduced based on the target supercooling degree.
When the deviation quantity delta T of the supercooling degree is less than 0, the supercooling degree is insufficient, and the opening degree of an expansion valve of the standby internal machine is periodically controlled to be reduced based on the target supercooling degree so as to reduce the flow rate of the refrigerant, increase the supercooling degree and reduce the noise of the refrigerant. The expansion valve adjustment cycle of the standby internal machine is T1, and the opening degree variation of the expansion valve adjustment is Δ T Pls.
According to the control method for the heating standby inner unit of the multi-connected air conditioner, the outdoor environment temperature is identified, the target high-pressure control sub-scene is realized, the heating effect is ensured, and the refrigerant noise of the heating standby inner unit is avoided; the supercooling degree of the indoor unit in the heating standby state is controlled finely, so that the aim of stably changing the supercooling degree of the indoor unit in the heating standby state and reducing the airflow sound or the liquid flow sound of a refrigerant is fulfilled.
Corresponding to the method for controlling the multi-connected air conditioner heating standby indoor unit provided by the embodiment, the embodiment of the invention provides an example for controlling the multi-connected air conditioner heating standby indoor unit by applying the method for controlling the multi-connected air conditioner heating standby indoor unit, and the method can be specifically executed by referring to the following steps 1 to 3:
step 1, outdoor environment temperature Tao is more than Ta1
Ta1 belongs to [18 ℃ and 21 ℃), when the outdoor environment temperature Ta is more than Ta1, the temperature is close to the sensible heat comfortable temperature of 25-27 ℃, the system heat load demand is small, the unit target high pressure Pd1 belongs to [23bar and 25bar ], the corresponding saturation temperature is 38-41 ℃, the temperature is slightly higher than the human body temperature by 1-3 ℃, and hot air sensing is carried out. At the moment, the target high pressure is low, the flow speed of the system refrigerant is low, the flowing sound of the refrigerant of the heating standby inner machine is low, the opening degree of the electronic expansion valve of the heating standby inner machine is controlled according to the target supercooling degree, and the method is only used for controlling the opening degree of the expansion valve of the standby inner machine.
As shown in the first table, when the outdoor environment temperature is changed from Tao > Ta1 to Ta2 < Tao < Ta > Ta1, the step 1 is maintained, the target high-pressure is set to be Pd1, and the opening degree of the expansion valve of the standby indoor unit is continuously controlled according to the target supercooling degree in order to avoid noise caused by sudden change of refrigerant flow due to change of the control mode of the expansion valve.
The variation Δ Pls of the opening of the electronic expansion valve of the heating standby internal machine is equal to the deviation Δ T of the supercooling degree
The supercooling degree deviation amount delta T is equal to the actual supercooling degree Tsh-the target supercooling degree Ttar _ sh
The actual supercooling degree Tsh is equal to the high-pressure corresponding saturation temperature Td-tube outlet temperature TinL
The value range of the target supercooling degree Ttar _ sh is generally [4 ℃, 7 ℃), the refrigerant of the internal machine in the heating standby state is ensured to be in a single-phase liquid state, and airflow sound caused by turbulent flow when the refrigerant is in a gas-liquid two-phase state is avoided.
Step 2, the outdoor environment temperature Tao is more than Ta3 and less than or equal to Ta2
Ta2 belongs to [15 ℃ and 17 ℃), Ta3 belongs to [ 9 ℃ and 7 ℃ and Ta3 is less than or equal to Tao and Ta2, the heat load requirement is large in a core region of heating requirement, the target high-pressure Pd2 belongs to [31bar and 33bar ], the corresponding saturation temperature is 50-53 ℃, the temperature is 13-15 ℃ higher than the temperature of a human body, and the sensing is obvious. At this time, because the target high pressure is high, the flow rate of the system refrigerant is high, the refrigerant flowing sound of the heating standby indoor unit is large, the opening degree of the electronic expansion valve of the heating standby indoor unit is controlled according to the variable valve speed, the valve adjusting amplitude is reduced, the valve adjusting speed is accelerated, the setting mode of the valve adjusting speed can be set according to the relation table of the supercooling degree deviation amount and the valve adjusting speed shown in the following table II, and the larger the supercooling degree deviation amount is, the smaller the valve adjusting period is.
And the normal period t1 of the valve adjustment belongs to [30s, 60s ], according to experimental experience, the valve adjustment is about 30-60 s, and the refrigerant state of the system basically reaches the stable adjustment state.
Table for relationship between supercooling deviation and valve regulating speed
Step 3, the outdoor environment temperature Tao is less than or equal to Ta4
Ta4 belongs to the range of-12 ℃ and-10 ℃, when the outdoor environment temperature Ta is not more than Ta4, the multi-connected unit is an ultralow temperature heating area, and generally has heating conditions, so the heating requirement on the multi-connected unit is reduced, the corresponding saturation pressure is about 5bar at the moment, in order to simultaneously consider the effect and the system reliability, the target high pressure needs to be reduced, the unit target high pressure Pd3 belongs to the range of 27bar and 29bar, the corresponding saturation temperature is 45-48 ℃, is about 8-10 ℃ higher than the human body temperature, and the perception is obvious. At the moment, because the ambient temperature is low, the probability of people in the standby internal machine is low, so the requirement on noise is not high, and the opening degree of the expansion valve of the standby internal machine can be controlled according to the target supercooling degree.
Corresponding to the method for controlling the multi-connected air conditioner heating standby indoor unit provided in the above embodiment, an embodiment of the present invention provides a control device for a multi-connected air conditioner heating standby indoor unit, which can be applied to a controller of a multi-connected air conditioner, and referring to a schematic structural diagram of the control device for a multi-connected air conditioner heating standby indoor unit shown in fig. 3, the device includes the following modules:
the setting module 31 is configured to monitor an outdoor environment temperature during a heating process of the multi-connected air conditioner, and set a corresponding target high-pressure according to the outdoor environment temperature.
And the judging module 32 is used for judging whether the temperature reaches a preset heat load interval or not based on the outdoor environment temperature, and if so, detecting the actual supercooling degree of the standby indoor unit.
And the control module 33 is configured to determine a valve adjusting rate according to the deviation of the supercooling degree between the actual supercooling degree and the target supercooling degree, and control the expansion valve corresponding to the standby indoor unit based on the valve adjusting rate.
The above-mentioned many online air conditioners heat standby inner machine controlling means that this embodiment provides sets up target high-pressure through the outdoor ambient temperature according to detecting, has realized the sub-scene control of target high pressure, guarantees the heating effect, through when air conditioner heat load demand is higher, according to the super-cooling deviation volume control of actual super-cooling degree and target super-cooling degree standby inner machine corresponding valve speed of expansion valve, has realized treating the interior quick-witted super-cooling degree of refined control, makes the super-cooling degree steady change of standby inner machine, has reduced refrigerant air current sound or liquid stream sound, and then has reduced the air conditioner noise.
In an embodiment, the control module 33 is further configured to calculate a difference between an actual supercooling degree and a target supercooling degree, so as to obtain a supercooling degree deviation amount; when the supercooling degree deviation amount is more than or equal to zero, determining a valve adjusting time interval according to the supercooling degree deviation amount, and controlling the opening degree of the expansion valve corresponding to the standby internal machine so as to periodically increase the preset opening degree at the valve adjusting time interval; wherein the valve timing interval is inversely related to the supercooling deviation amount.
In one embodiment, the control module 33 is further configured to control the opening degree of the expansion valve corresponding to the standby indoor unit to be periodically decreased based on the target supercooling degree when the deviation amount of the supercooling degree is less than zero.
In one embodiment, the determining module 32 is configured to determine that the preset thermal load interval is reached when the outdoor environment temperature is detected to be in the (Ta4, Ta3] interval, or the outdoor environment temperature detected for the first time is in the (Ta3, Ta2] or the (Ta2, Ta1] interval, or determine that the preset thermal load interval is reached when the outdoor environment temperature is decreased from the (Ta3, Ta2] interval to the (Ta4, Ta3] interval, or determine that the preset thermal load interval is reached when the outdoor environment temperature is increased from the (Ta3, Ta2] interval to the (Ta2, Ta 1) interval.
In one embodiment, the above apparatus further comprises:
and the second control module is used for controlling the opening degree of the expansion valve corresponding to the standby indoor unit based on the target supercooling degree when the outdoor environment temperature is higher than Ta1 or is reduced from higher than Ta1 to (Ta2, Ta 1).
And the third control module is used for controlling the opening degree of the expansion valve corresponding to the standby indoor unit based on the target supercooling degree when the outdoor environment temperature is less than or equal to Ta4 or when the outdoor environment temperature is increased from less than or equal to Ta4 to (Ta4, Ta 3).
In one embodiment, the setting module 31 is configured to set the target high pressure to a first pressure when the outdoor ambient temperature is greater than Ta1, or when the outdoor ambient temperature is decreased from greater than Ta1 to (Ta2, Ta 1), set the target high pressure to a second pressure when the preset heat load interval is reached based on the outdoor ambient temperature, and set the target high pressure to a third pressure when the outdoor ambient temperature is equal to or less than Ta4, or when the outdoor ambient temperature is increased from equal to or less than Ta4 to (Ta4, Ta 3), wherein the third pressure is greater than the first pressure and less than the second pressure.
The control device for the standby indoor unit of the multi-connected air conditioner realizes target high-pressure control sub-scenes by identifying the outdoor environment temperature, thereby ensuring the heating effect and avoiding the refrigerant noise of the standby indoor unit; the supercooling degree of the indoor unit in the heating standby state is controlled finely, so that the aim of stably changing the supercooling degree of the indoor unit in the heating standby state and reducing the airflow sound or the liquid flow sound of a refrigerant is fulfilled.
Corresponding to the method for controlling the heating standby internal machines of the multi-connected air conditioner provided by the above embodiment, the embodiment provides a multi-connected air conditioner, which includes a computer readable storage medium storing a computer program and a processor, and when the computer program is read and executed by the processor, the method for controlling the heating standby internal machines of the multi-connected air conditioner provided by the above embodiment is implemented.
The embodiment also provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements each process of the above-mentioned embodiment of the method for controlling the multi-connected air conditioner heating standby internal unit, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.
Of course, those skilled in the art will understand that all or part of the processes in the methods of the above embodiments may be implemented by instructing the control device to perform operations through a computer, and the programs may be stored in a computer-readable storage medium, and when executed, the programs may include the processes of the above method embodiments, where the storage medium may be a memory, a magnetic disk, an optical disk, and the like.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. As for the multi-connected air conditioner heating standby indoor unit control device and the multi-connected air conditioner disclosed in the embodiments, since the control method corresponds to the multi-connected air conditioner heating standby indoor unit control method disclosed in the embodiments, the description is relatively simple, and the relevant points can be referred to the description of the method part.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A control method for an indoor unit of a multi-connected air conditioner in a heating standby mode is characterized by comprising the following steps:
monitoring the outdoor environment temperature in the heating process of the multi-connected air conditioner, and setting corresponding target high-pressure according to the outdoor environment temperature;
judging whether a preset heat load interval is reached or not based on the outdoor environment temperature, and if so, detecting the actual supercooling degree of the standby internal machine;
and determining the valve adjusting rate according to the deviation amount of the supercooling degree of the actual supercooling degree and the target supercooling degree, and controlling the expansion valve corresponding to the standby indoor unit based on the valve adjusting rate.
2. The method for controlling the multi-connected air conditioner heating standby inner unit according to claim 1, wherein the step of determining a valve adjusting rate according to the deviation amount of the supercooling degrees of the actual supercooling degree and the target supercooling degree, and controlling the expansion valve corresponding to the standby inner unit based on the valve adjusting rate comprises the steps of:
calculating the difference value between the actual supercooling degree and the target supercooling degree to obtain the supercooling degree deviation value;
when the supercooling degree deviation amount is greater than or equal to zero, determining a valve adjusting time interval according to the supercooling degree deviation amount, and controlling the opening degree of the expansion valve corresponding to the standby internal machine to periodically increase the preset opening degree at the valve adjusting time interval; wherein the valve timing interval is inversely related to the subcooling deviation amount.
3. The method for controlling the multi-connected air conditioner heating standby indoor units according to claim 2, further comprising:
and when the supercooling degree deviation amount is less than zero, controlling the opening degree of an expansion valve corresponding to the standby internal machine to be periodically reduced based on the target supercooling degree.
4. The method for controlling the multi-connected air conditioner heating standby indoor units according to claim 1, wherein the step of determining whether a preset heat load interval is reached based on the outdoor environment temperature comprises:
determining that the preset heat load interval is reached when the outdoor environment temperature is detected to be in the (Ta4, Ta 3) interval, or the outdoor environment temperature detected for the first time is detected to be in the (Ta3, Ta 2) or (Ta2, Ta 1) interval;
alternatively, the first and second electrodes may be,
determining that the preset thermal load interval is reached when the outdoor ambient temperature decreases from the (Ta3, Ta 2) interval to the (Ta4, Ta 3) interval;
alternatively, the first and second electrodes may be,
determining that the preset thermal load interval is reached when the outdoor ambient temperature is increased from the (Ta3, Ta 2) interval to the (Ta2, Ta 1) interval.
5. The method for controlling the multi-connected air conditioner heating standby indoor units according to claim 4, further comprising:
and when the outdoor environment temperature is higher than Ta1 or the outdoor environment temperature is reduced from higher than Ta1 to (Ta2, Ta 1), controlling the opening degree of the expansion valve corresponding to the standby indoor unit based on the target supercooling degree.
6. The method for controlling the multi-connected air conditioner heating standby indoor units according to claim 4, further comprising:
and when the outdoor environment temperature is less than or equal to Ta4, or when the outdoor environment temperature is increased from less than or equal to Ta4 to (Ta4, Ta 3), controlling the opening degree of the expansion valve corresponding to the standby indoor unit based on the target supercooling degree.
7. The method for controlling the multi-connected air conditioner heating standby indoor units according to claim 4, wherein the step of setting the corresponding target high pressure according to the outdoor environment temperature comprises:
setting the target high pressure to a first pressure when the outdoor ambient temperature is greater than Ta1, or when the outdoor ambient temperature is decreased from greater than Ta1 to (Ta2, Ta 1);
setting the target high pressure to a second pressure when it is determined that the preset heat load interval is reached based on the outdoor ambient temperature;
and when the outdoor environment temperature is less than or equal to Ta4, or when the outdoor environment temperature is increased from less than or equal to Ta4 to (Ta4, Ta 3), setting the target high-pressure as a third pressure, wherein the third pressure is greater than the first pressure and less than the second pressure.
8. The utility model provides a multi-connected air conditioner heats standby internal machine controlling means which characterized in that includes:
the setting module is used for monitoring the outdoor environment temperature in the heating process of the multi-connected air conditioner and setting the corresponding target high-pressure according to the outdoor environment temperature;
the judging module is used for judging whether the outdoor environment temperature reaches a preset heat load interval or not based on the outdoor environment temperature, and if so, detecting the actual supercooling degree of the standby indoor unit;
and the control module is used for determining the valve adjusting rate according to the deviation amount of the supercooling degree of the actual supercooling degree and the target supercooling degree and controlling the expansion valve corresponding to the standby indoor unit based on the valve adjusting rate.
9. A multi-connected air conditioner comprising a computer readable storage medium storing a computer program and a processor, the computer program being read by the processor and executing the method according to any one of claims 1 to 7.
10. A computer-readable storage medium, characterized in that it stores a computer program which, when read and executed by a processor, implements the method according to any one of claims 1-7.
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