CN113203165A - Noise reduction control method and device for multi-connected air conditioner and multi-connected air conditioner - Google Patents
Noise reduction control method and device for multi-connected air conditioner and multi-connected air conditioner Download PDFInfo
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- CN113203165A CN113203165A CN202110457982.7A CN202110457982A CN113203165A CN 113203165 A CN113203165 A CN 113203165A CN 202110457982 A CN202110457982 A CN 202110457982A CN 113203165 A CN113203165 A CN 113203165A
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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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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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
- F24F11/83—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
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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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
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing 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
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
- F24F2013/247—Active noise-suppression
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Abstract
The invention discloses a noise reduction control method and device for a multi-connected air conditioner and the multi-connected air conditioner, wherein the noise reduction control method for the multi-connected air conditioner comprises the following steps: when the multi-connected air conditioner exits the oil return stage, controlling the heat exchange assembly to start to operate; monitoring the actual supercooling degree of the multi-connected air conditioner; when the actual supercooling degree is smaller than the preset supercooling degree, the actual supercooling degree is controlled to be increased to be larger than or equal to the preset supercooling degree on the basis of the heat exchange assembly, so that the refrigerant entering the indoor unit is in a liquid state. The invention can ensure that the refrigerant entering the indoor unit is completely liquid, avoid the problem of noise generation of the refrigerant due to insufficient supercooling degree, and improve the use experience of users.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a noise reduction control method and device for a multi-connected air conditioner and the multi-connected air conditioner.
Background
At present, after a multi-connected air conditioner enters an oil return stage in a refrigerating operation or dehumidifying operation process, because a refrigerant is required to carry oil, the operation frequency of a compressor is increased, and the opening degree of an expansion valve of an indoor unit is increased. After the oil return stage is finished, although the refrigeration oil in the multi-connected system is brought back, a large amount of refrigerants are stored in the outdoor unit liquid storage tank, the supercooling degree of the refrigerants entering the indoor unit is insufficient, the refrigerants are in a gas phase state, obvious airflow sound is generated when the refrigerants flow through the indoor unit, and the use experience of users is reduced.
Disclosure of Invention
In order to solve the problems, the invention provides a noise reduction control method and device for a multi-connected air conditioner and the multi-connected air conditioner, which can ensure that a refrigerant entering an indoor unit is completely in a liquid state, avoid the problem that the refrigerant generates noise due to insufficient supercooling degree, and improve the use experience of a user.
According to an embodiment of the present invention, in one aspect, a noise reduction control method for a multi-connected air conditioner is provided, which is applied to the multi-connected air conditioner, wherein a heat exchange assembly is arranged between an outdoor unit expansion valve and an indoor unit expansion valve of the multi-connected air conditioner, and the method includes: when the multi-connected air conditioner exits the oil return stage, controlling the heat exchange assembly to start to operate; monitoring the actual supercooling degree of the multi-connected air conditioner; and when the actual supercooling degree is smaller than the preset supercooling degree, controlling the actual supercooling degree to be increased to be larger than or equal to the preset supercooling degree based on the heat exchange assembly so as to enable the refrigerant entering the indoor unit to be in a liquid state.
Through adopting above-mentioned technical scheme, carry out the secondary heat transfer based on heat exchange assembly to the refrigerant of drain pipe, the actual super-cooled rate more than or equal to of control multi-connected air conditioner predetermines the super-cooled rate, can guarantee that the refrigerant that gets into the indoor set is liquid completely, has avoided the problem that the super-cooled rate is not enough to lead to the refrigerant to produce the noise, has promoted user's use and has experienced.
Preferably, before the step of controlling the heat exchange assembly to start operating, the method further comprises: when the multi-connected air conditioner exits the oil return stage, detecting the opening and closing states of indoor units of the multi-connected air conditioner; and controlling the opening degree of the expansion valve of each indoor unit according to the opening and closing state.
By adopting the technical scheme, the opening degree of each indoor unit expansion valve is controlled according to the refrigerating capacity information of the indoor unit in the starting state, so that the opening degree of the indoor unit expansion valve is forcibly controlled, the phenomenon that the opening degree of the indoor unit expansion valve is too large due to refrigerant misjudgment is avoided, and the running stability of the multi-connected air conditioner is improved.
Preferably, the step of controlling the valve opening degree of each indoor unit expansion valve according to the open/close state includes: calculating the total refrigerating capacity of a target indoor unit based on the opening and closing state of each indoor unit to obtain a first refrigerating capacity, and calculating the ratio of the first refrigerating capacity to the total refrigerating capacity of the multi-connected air conditioner to obtain a refrigerating ratio; the target indoor unit is an indoor unit in a starting state; when the refrigeration ratio is larger than or equal to a preset ratio, controlling the target expansion valve to operate at a first preset opening degree; wherein the target expansion valve is an expansion valve of the target indoor unit.
By adopting the technical scheme, when the refrigerating capacity requirement of the multi-connected air conditioner is high, the electronic expansion valve of the indoor unit in the starting state is controlled to operate at a certain opening degree, and the phenomenon that the opening degree of the expansion valve of the indoor unit is too large or too small due to error control is avoided on the basis of ensuring the refrigerating requirement of the indoor unit.
Preferably, the noise reduction control method of the multi-connected air conditioner further includes: when the refrigeration ratio is smaller than the preset ratio, controlling the target expansion valve to operate at a second preset opening degree for a first preset time; wherein the second preset opening degree is zero; and after the target expansion valve operates at the second preset opening degree for the first preset time, controlling the target expansion valve to operate at the first preset opening degree.
By adopting the technical scheme, the electronic expansion valve of the indoor unit in the starting state is controlled to be closed for a period of time, the refrigerant circulation can be cut off, the actual supercooling degree is improved, the refrigerant flowing to the indoor unit is converted into liquid, the noise of the indoor unit is reduced, the target expansion valve is opened after the first preset time so as to meet the refrigeration requirement of the target indoor unit, and the refrigeration or dehumidification effect of the indoor unit is improved.
Preferably, the heat exchange assembly comprises a heat exchanger, a solenoid valve and a supercooling valve, a first port of the heat exchanger is connected with the outdoor unit expansion valve through a pipeline, a second port of the heat exchanger is connected with the indoor unit expansion valve through a pipeline, a third port of the heat exchanger is connected with the outdoor unit expansion valve through a pipeline, and a fourth port of the heat exchanger is connected with the air distribution pipeline; the first port is in communication with the second port, and the third port is in communication with the fourth port; the step of controlling the heat exchange assembly to start operating comprises the following steps: when the target expansion valve operates at the first preset opening degree, controlling the electromagnetic valve to be opened, and controlling the supercooling valve to operate at a third preset opening degree; the electromagnetic valve is arranged on a pipeline between the fourth port and the air separator, and the supercooling valve is arranged on a pipeline between the third port and the outdoor unit expansion valve.
Through adopting above-mentioned technical scheme, realized the secondary heat transfer to the drain pipe refrigerant, reduced the refrigerant temperature in the drain pipe, promoted the super-cooled rate, made the refrigerant that gets into the indoor set become liquid, promoted the noise reduction effect of indoor set.
Preferably, the step of controlling the actual supercooling degree to be greater than or equal to the preset supercooling degree based on the heat exchange assembly when the actual supercooling degree is less than the preset supercooling degree includes: when the supercooling valve operates for a second preset time at the third preset opening degree, judging whether the current actual supercooling degree is smaller than the preset supercooling degree; and when the actual supercooling degree is smaller than the preset supercooling degree, controlling the supercooling valve to increase a fourth preset opening degree, or controlling the supercooling valve to increase a fifth preset opening degree at every preset time interval until the actual supercooling degree is increased to be larger than or equal to the preset supercooling degree.
By adopting the technical scheme, the supercooling valve is controlled to be increased, part of the refrigerant is separated from the refrigerant flowing to the indoor unit to be throttled and cooled, and the refrigerant enters the liquid outlet pipe through the plate exchange to be subjected to secondary heat exchange, so that the supercooling degree is improved, the supercooling degree of the refrigerant entering the indoor unit is ensured to be liquid, and the reliability of noise reduction of the indoor unit is ensured.
Preferably, the noise reduction control method of the multi-connected air conditioner further includes: and when the actual supercooling degree is more than or equal to the preset supercooling degree, controlling the supercooling valve to keep the current opening operation within a third preset time.
By adopting the technical scheme, the supercooling valve is controlled to keep the current opening degree for a period of time, so that the indoor unit can be ensured not to generate noise continuously, and the user experience is improved.
According to an embodiment of the present invention, in another aspect, a noise reduction control device for a multi-connected air conditioner is provided, where a heat exchange assembly is disposed between an outdoor unit expansion valve and an indoor unit expansion valve of the multi-connected air conditioner, and the noise reduction control device includes: the first control module is used for controlling the heat exchange assembly to start to operate when the multi-connected air conditioner exits the oil return stage; the monitoring module is used for monitoring the actual supercooling degree of the multi-connected air conditioner; and the second control module is used for controlling the actual supercooling degree to be more than or equal to the preset supercooling degree based on the heat exchange assembly when the actual supercooling degree is less than the preset supercooling degree so as to ensure that the refrigerant entering the indoor unit is in a liquid state.
According to an embodiment of the present invention, in another aspect, a multi-connected air conditioner is provided, which includes a heat exchanger, a solenoid valve, an supercooling valve, a computer readable storage medium storing a computer program, and a processor, wherein the computer program is read by the processor and executed to implement the method according to any one of the first aspect; the heat exchanger is arranged between an outdoor unit expansion valve and an indoor unit expansion valve, a first port of the heat exchanger is connected with the outdoor unit expansion valve through a pipeline, a second port of the heat exchanger is connected with the indoor unit expansion valve through a pipeline, a third port of the heat exchanger is connected with the outdoor unit expansion valve through a pipeline, and a fourth port of the heat exchanger is connected with an air distribution pipeline; the first port is in communication with the second port, and the third port is in communication with the fourth port; the electromagnetic valve is arranged on a pipeline between the fourth port and the air separator, and the supercooling valve is arranged on a pipeline between the third port and the outdoor unit expansion valve.
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: when the multi-connected air conditioner exits the oil return stage, the operation is started through the heat exchange assembly between the control outdoor unit and the indoor unit, so that secondary heat exchange is carried out on a refrigerant entering the indoor unit, secondary heat exchange is carried out on the refrigerant entering the liquid outlet pipe through the heat exchange assembly, the actual supercooling degree of the multi-connected air conditioner is controlled to be larger than or equal to the preset supercooling degree, the refrigerant entering the indoor unit can be guaranteed to be completely liquid, the problem that the refrigerant generates noise due to insufficient supercooling degree is avoided, and the use experience of a user is improved.
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 schematic structural diagram of a multi-connected air conditioner provided by the present invention;
fig. 2 is a flowchart of a noise reduction control method of a multi-connected air conditioner according to the present invention;
fig. 3 is a flow chart of a noise improvement method after refrigeration oil return of a multi-connected air conditioner provided by the invention;
fig. 4 is a schematic structural diagram of a noise reduction control device of a multi-connected air conditioner provided by the invention.
Description of reference numerals:
11-a condenser; 121-12 n-indoor units; 131-13 n-indoor unit expansion valve; 14-a compressor; 15-gas component; 16-outdoor unit expansion valve; 17-a heat exchanger; 18-an supercooling valve; 19-electromagnetic valve.
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.
The embodiment provides a multi-connected air conditioner, referring to a schematic structural diagram of the multi-connected air conditioner shown in fig. 1, the multi-connected air conditioner includes: condenser 11, a plurality of indoor units 121 ~ 12n, a plurality of indoor unit expansion valves 131 ~ 13n, compressor 14, gas divide 15, outdoor unit expansion valve 16 and heat exchange assembly, this heat exchange assembly includes: a heat exchanger 17, a subcooling valve 18 and a solenoid valve 19.
As shown in fig. 1, a first port (i.e., a lower left port in fig. 1) of the heat exchanger 17 is connected to the outdoor expansion valve 18 by a pipe, a second port (i.e., a lower right port in fig. 1) of the heat exchanger 17 is connected to a main pipe to which each indoor expansion valve is connected, a third port (i.e., an upper left port in fig. 1) of the heat exchanger 17 is connected to the outdoor expansion valve 18 by a pipe, and a fourth port (i.e., an upper right port in fig. 1) of the heat exchanger 17 is connected to the air separator 15 by a pipe; the first port of the heat exchanger is communicated with the inner part of the second port, and the third port is communicated with the inner part of the fourth port.
The solenoid valve 19 is disposed on a pipe between the fourth port of the heat exchanger and the air separator 15, and the supercooling valve 18 is disposed on a pipe between the third port of the heat exchanger and the outdoor unit expansion valve 18.
The heat exchanger is used for carrying out secondary heat exchange on the refrigerant flowing to the indoor unit, namely, the temperature of the refrigerant flowing to the indoor unit is reduced, so that the refrigerant flowing to the indoor unit is in a liquid state, and the phenomenon that the refrigerant in a gas phase state enters the indoor unit to generate noise is avoided. The heat exchanger can be any one of a floating head type heat exchanger, a fixed tube plate type heat exchanger, a U-shaped tube plate type heat exchanger and a plate type heat exchanger.
The embodiment provides a noise reduction control method for a multi-connected air conditioner, which may be applied to the multi-connected air conditioner provided in the above embodiment, referring to a flow chart of the noise reduction control method for the multi-connected air conditioner shown in fig. 2, the method mainly includes the following steps S202 to S206:
step S202: and when the multi-connected air conditioner exits the oil return stage, controlling the heat exchange assembly to start to operate.
When the multi-connected air conditioner operates in a refrigeration mode or a dehumidification mode, when the compressor receives an oil return exiting instruction sent by the controller, the multi-connected air conditioner is determined to exit an oil return stage, and the electromagnetic valve and the supercooling valve in the heat exchange assembly are controlled, so that the heat exchanger in the heat exchange assembly performs secondary heat exchange on a refrigerant flowing to the indoor unit.
Step S204: and monitoring the actual supercooling degree of the multi-connected air conditioner.
The method comprises the steps of monitoring the high-pressure saturation temperature and the liquid outlet pipe temperature of the multi-connected air conditioner based on a temperature sensor, obtaining the high-pressure saturation temperature and the liquid outlet pipe temperature detected in real time, and calculating the actual supercooling degree, wherein the actual supercooling degree is the high-pressure saturation temperature-the liquid outlet pipe temperature.
Step S206: when the actual supercooling degree is smaller than the preset supercooling degree, the actual supercooling degree is controlled to be increased to be larger than or equal to the preset supercooling degree on the basis of the heat exchange assembly, so that the refrigerant entering the indoor unit is in a liquid state.
Whether the actual supercooling degree is smaller than the preset supercooling degree or not is judged, if the actual supercooling degree is smaller than the preset supercooling degree, the temperature of the refrigerant flowing into the indoor unit is still high, the refrigerant flowing into the indoor unit is possibly not completely in a liquid state, and in order to improve the noise reduction effect, the temperature of the refrigerant flowing into the indoor unit is reduced through the heat exchange assembly, so that the actual supercooling degree is improved, and the refrigerant entering the indoor unit is guaranteed to be in the liquid state. The preset supercooling degree is a value which ensures that the refrigerant entering the indoor unit is liquid enough, and the value range of the preset supercooling degree can be 8-12 ℃.
The noise reduction control method of the multi-connected air conditioner provided by the embodiment, when the multi-connected air conditioner exits the oil return stage, the operation is started through the heat exchange assembly between the control outdoor unit and the indoor unit, so that secondary heat exchange is performed on a refrigerant entering the indoor unit, secondary heat exchange is performed on the refrigerant of the liquid outlet pipe based on the heat exchange assembly, the actual supercooling degree of the multi-connected air conditioner is controlled to be larger than or equal to the preset supercooling degree, the refrigerant entering the indoor unit can be guaranteed to be completely liquid, the problem that the refrigerant generates noise due to insufficient supercooling degree is avoided, and the use experience of a user is improved.
Considering that a large amount of refrigerant is stored in the external machine liquid storage tank when the oil return stage is finished, and the indoor machine expansion valve easily misjudges that the air conditioning system lacks the refrigerant according to the pipe temperature, so that the opening degree of the indoor machine expansion valve is large, the method provided by the embodiment further comprises the following steps (1) to (2):
step (1): and when the multi-connected air conditioner exits the oil return stage, detecting the opening and closing states of the indoor units of the multi-connected air conditioner.
Before the control heat exchange assembly starts to operate, when the multi-connected air conditioner exits the oil return stage, the indoor unit in the on state and the indoor unit in the off state are detected.
Step (2): and controlling the valve opening and the operation time of each indoor unit expansion valve according to the opening and closing state.
According to the refrigerating capacity information of the indoor units in the starting state, the opening degree of each indoor unit expansion valve is controlled, so that the opening degree of the indoor unit expansion valve is forcibly controlled, the phenomenon that the opening degree of the indoor unit expansion valve is too large due to refrigerant misjudgment is avoided, and the running stability of the multi-connected air conditioner is improved.
Specifically, when controlling the valve opening of the expansion valve of the indoor unit, the following steps 1) to 3) may be referred to:
step 1): and calculating the total refrigerating capacity of the target indoor unit based on the opening and closing state of each indoor unit to obtain a first refrigerating capacity, and calculating the ratio of the first refrigerating capacity to the total refrigerating capacity of the multi-connected air conditioner to obtain a refrigerating ratio.
The target indoor unit is an indoor unit in a starting state. Accumulating the refrigerating capacity (such as the rated refrigerating capacity of the indoor units) of each target indoor unit in the starting state to obtain the total refrigerating capacity of the indoor units in the starting state, recording the total refrigerating capacity as a first refrigerating capacity Q, namely the total capacity requirement of running the indoor units, calculating the ratio Q/Q of the first refrigerating capacity Q to the total refrigerating capacity Q of the multi-connected air conditioner (namely the accumulated value of the refrigerating capacities of all the indoor units), and taking the Q/Q as the refrigerating ratio.
Step 2): and when the refrigeration ratio is greater than or equal to the preset ratio, controlling the target expansion valve to operate at a first preset opening degree.
The target expansion valve is an expansion valve of the target indoor unit. And judging whether the refrigeration ratio satisfies that Q/Q is larger than or equal to K, wherein K is a preset ratio (the value range can be 20-40%), if so, controlling the opening degree of the target expansion valve to be a first preset opening degree, controlling the opening degree of an electronic expansion valve of the indoor unit in a closed state to be 0pls, automatically controlling the operation of the compressor frequency, operating the target indoor unit at the current rotating speed, and keeping the indoor unit in a closed state.
In order to avoid the situation that the frequency of the compressor is high and high-pressure protection is easy to occur when the target expansion valve is closed or too small, the value range of the first preset opening degree may be 70-100 pls. When the refrigerating capacity requirement of the multi-connected air conditioner is high, the electronic expansion valve of the indoor unit in the starting state is controlled to operate at a certain opening degree, and the phenomenon that the opening degree of the expansion valve of the indoor unit is too large or too small due to error control is avoided on the basis of ensuring the refrigerating requirement of the indoor unit.
Step 3): and when the refrigeration ratio is smaller than the preset ratio, controlling the target expansion valve to operate at the second preset opening degree for a first preset time, and after the target expansion valve operates at the second preset opening degree for the first preset time, controlling the target expansion valve to operate at the first preset opening degree.
The second preset opening is 0pls, and the value range of the first preset time can be 5-15 s. When the refrigerating ratio meets Q/Q < K, the requirement on the refrigerating capacity of the multi-connected air conditioner is smaller, the target expansion valve is controlled to be continuously closed for a first preset time, the rotating speed of the compressor and the rotating speed of the indoor unit are not controlled, namely the frequency of the compressor runs according to the self control mode, the target indoor unit runs according to the current rotating speed, and the indoor unit in the shutdown state keeps the shutdown state. In order to ensure the comfort of the indoor environment temperature, after the target expansion valve is closed for a first preset time, the target expansion valve is controlled to be opened to a first preset opening degree.
The method has the advantages that the electronic expansion valve of the indoor unit in the starting state is controlled to be closed for a period of time, the refrigerant circulation can be cut off, the actual supercooling degree is improved, the refrigerant flowing to the indoor unit is converted into liquid, the noise of the indoor unit is reduced, the target expansion valve is opened after the first preset time, the refrigeration requirement of the target indoor unit is met, and the refrigeration or dehumidification effect of the indoor unit is improved.
In a specific embodiment, the heat exchange assembly includes: the system comprises a heat exchanger, an electromagnetic valve and a supercooling valve, wherein when the target expansion valve operates at a first preset opening degree, the electromagnetic valve is controlled to be opened, and the supercooling valve is controlled to operate at a third preset opening degree. The value range of the third preset opening degree can be 100-120pls, the heat exchanger starts to operate by opening the electromagnetic valve and the supercooling valve, secondary heat exchange of the refrigerant in the liquid outlet pipe is achieved, the temperature of the refrigerant in the liquid outlet pipe is reduced, the supercooling degree is improved, the refrigerant entering the indoor unit is changed into liquid, and the noise reduction effect of the indoor unit is improved.
In order to further improve the user experience, the embodiment provides an implementation manner of controlling the actual supercooling degree to be increased to be greater than or equal to the preset supercooling degree based on the heat exchange assembly, and the implementation manner may be specifically executed with reference to the following steps 1 to 3:
step 1: and when the supercooling valve operates for a second preset time at a third preset opening degree, judging whether the current actual supercooling degree is smaller than the preset supercooling degree.
And when the electromagnetic valve and the supercooling valve are opened for a second preset time, calculating the current actual supercooling degree, and judging whether the refrigerant flowing to the indoor unit is changed into liquid state or not by judging whether the current actual supercooling degree is smaller than the preset supercooling degree.
Step 2: and when the actual supercooling degree is smaller than the preset supercooling degree, controlling the supercooling valve to increase a fourth preset opening degree, or controlling the supercooling valve to increase a fifth preset opening degree at every preset time interval until the actual supercooling degree is increased to be larger than or equal to the preset supercooling degree.
The value range of the fourth preset opening degree can be 10-20 pls, the value range of the preset time can be 1-3 s, and the value range of the fifth preset opening degree can be 5-10 pls. If the actual supercooling degree of the refrigerant is smaller than the preset supercooling degree, the refrigerant is not completely converted into liquid, a part of the refrigerant is separated from the refrigerant flowing to the indoor unit by controlling the supercooling valve to be increased to be throttled and cooled, secondary heat exchange is carried out on the refrigerant of the liquid outlet pipe through plate exchange, the supercooling degree is improved, the supercooling degree of the refrigerant entering the indoor unit is ensured to be liquid enough, and the reliability of noise reduction of the indoor unit is ensured.
And step 3: and when the actual supercooling degree is more than or equal to the preset supercooling degree, controlling the supercooling valve to keep the current opening degree to operate within a third preset time.
The value range of the third preset time can be 60-180s, if the actual supercooling degree of the refrigerant is larger than or equal to the preset supercooling degree, the heat exchange assembly plays a role in improving the supercooling degree, the supercooling valve is stopped to be controlled to be increased, the supercooling valve is controlled to keep the current opening degree to operate for a period of time, the indoor unit can be guaranteed not to generate noise continuously, and user experience is improved.
According to the noise reduction control method of the multi-connected air conditioner, after the oil return stage is finished, noise is improved, on one hand, misjudgment that the system lacks refrigerants is avoided, and the expansion valve is opened, on the other hand, the refrigerants entering the indoor unit are in a liquid state through increasing the supercooling degree, the noise is low, the noise of the indoor unit is reduced, and the comfort level of a user is improved.
Corresponding to the noise reduction control method for the multi-connected air conditioner provided in the above embodiment, an embodiment of the present invention provides an example of performing noise improvement after refrigeration oil return of the multi-connected air conditioner by using the noise reduction control method for the multi-connected air conditioner, referring to a flow chart of the noise improvement method after refrigeration oil return of the multi-connected air conditioner shown in fig. 3, the following steps S301 to S312 may be specifically referred to:
step S301: and when the multi-connected air conditioner is in a refrigeration mode or a dehumidification mode, the multi-connected air conditioner enters a noise optimization mode when the multi-connected air conditioner exits an oil return stage.
Step S302: at intervals of time t1And detecting and recording the high-pressure saturation temperature, the liquid outlet pipe temperature and the first refrigerating capacity of the indoor unit in the starting state.
T above1The value range of (1) is 4-8 s.
Step S303: and judging whether the first refrigerating capacity Q meets Q/Q < K, if so, executing step S304, and if not, executing step S305.
Q is the total refrigerating capacity of all indoor units, and the value range of K is 20-40%.
Step S304: controlling the opening degree of all the indoor unit expansion valves to be 0pls and keeping the T1And after the time, controlling the expansion valve of the indoor unit in the starting state to be opened to Apls.
When the refrigerating capacity requirement meets the condition that Q/Q is less than K (K is 20-40%), all the internal machine electronic expansion valves are controlled to be opened to PMV 0pls (refrigerant does not circulate, and the supercooling degree is increased), the frequency of the compressor is automatically controlled to operate, and the T lasts1(T15-15s) the indoor unit in the power-on state operates according to the current rotating speed, and the indoor unit in the power-off state keeps the power-off state.
Step S305: and controlling the expansion valve of the indoor unit in the starting state to open to Apls, and controlling the expansion valve of the indoor unit in the shutdown state to be 0 pls.
When the refrigerating capacity requirement meets that Q/Q is larger than or equal to K (K is 20-40%), controlling the expansion valve PMV of the indoor unit in the starting state to be A (A is 70-100pls, and is distinguished by the size of the indoor unit, controlling the expansion valve PMV of the indoor unit in the shutdown state to be 0pls, automatically controlling the operation of the compressor frequency, operating the indoor unit in the starting state according to the current rotating speed, and keeping the indoor unit in the shutdown state. When Q/Q is larger than or equal to K, if the first control is adopted to control all the expansion valves of the indoor unit to be 0pls, the frequency of the compressor is high, high-pressure protection is easy to occur, and the compressor is not suitable for use.
Step S306: controlling the solenoid valve to open, controlling the opening of the super-cooling valve to be B, and continuing to be T2And calculating the actual supercooling degree according to the high-pressure saturation temperature and the liquid outlet pipe temperature.
T2The value range of (A) is 30-60 s, and the value range of (B) is 100-120 pls. The plate heat exchanger is controlled to be opened, secondary heat exchange (temperature reduction of the refrigerant) is carried out on the refrigerant of the liquid outlet pipe, the supercooling degree is improved, and the refrigerant entering the indoor unit is in a liquid state.
Step S307: judging the actual supercooling degree Tgl1Whether or not Tgl is satisfied1< T, if yes, step S308 is executed, if no, step S309 is executed.
Step S308: controlling the opening of the subcooling valve to increase when Tgl1When the opening is more than or equal to T, controlling the supercooling valve to keep the current opening to operate T3Time.
If: tgl1If T is less than 8-12 deg.C, the opening of the supercooling valve is increased, and when Tgl is equal to1When the opening degree is more than or equal to T, the supercooling valve keeps the current opening degree and keeps T continuously3(T3The value range of the multi-connected air conditioner is 60-180s), and then the noise reduction control of the multi-connected air conditioner is quitted.
Step S309: controlling the supercooling valve to keep the current opening degree to operate T3Time.
The method for improving the noise of the multi-connected air conditioner after refrigeration and oil return solves the problems that in the prior art, when a system lacks a refrigerant after oil return, the refrigeration operation airflow sound is loud and the control is invalid, so that the user experience and the satisfaction degree are improved.
Corresponding to the noise reduction control method of the multi-connected air conditioner provided in the above embodiment, an embodiment of the present invention provides a noise reduction control device of a multi-connected air conditioner, which can be applied to the above multi-connected air conditioner, referring to a schematic structural diagram of the noise reduction control device of the multi-connected air conditioner shown in fig. 4, and the device includes the following modules:
and the first control module 41 is used for controlling the heat exchange assembly to start to operate when the multi-connected air conditioner exits the oil return stage.
And the monitoring module 42 is used for monitoring the actual supercooling degree of the multi-connected air conditioner.
And the second control module 43 is configured to, when the actual supercooling degree is less than the preset supercooling degree, control the actual supercooling degree to be increased to be greater than or equal to the preset supercooling degree based on the heat exchange assembly, so that the refrigerant entering the indoor unit is in a liquid state.
The above-mentioned controlling means that makes an uproar falls of ally oneself with air conditioner more that this embodiment provides, when the air conditioner that ally oneself with withdraws from the oil return stage more, start the operation through the heat exchange assembly between control outdoor unit and the indoor set, carry out the secondary heat transfer to the refrigerant of getting into the indoor set, carry out the secondary heat transfer through the refrigerant based on heat exchange assembly to the drain pipe, the actual super-cooled rate more than or equal to of control air conditioner more that ally oneself with predetermines the super-cooled rate, the refrigerant that can guarantee to get into the indoor set is liquid completely, the problem of the not enough refrigerant noise that leads to of super-cooled rate has been avoided, user's use experience has been promoted.
In one embodiment, the above apparatus further comprises:
and the detection module is used for detecting the opening and closing states of the indoor units of the multi-connected air conditioner when the multi-connected air conditioner exits the oil return stage.
And the third control module is used for controlling the valve opening of each indoor unit expansion valve according to the opening and closing state.
In an embodiment, the third control module is further configured to calculate a total cooling capacity of a target indoor unit based on an on-off state of each indoor unit to obtain a first cooling capacity, and calculate a ratio of the first cooling capacity to the total cooling capacity of the multi-connected air conditioner to obtain a cooling ratio; the target indoor unit is an indoor unit in a starting state; when the refrigeration ratio is greater than or equal to a preset ratio, controlling the target expansion valve to operate at a first preset opening degree; wherein the target expansion valve is an expansion valve of the target indoor unit.
In an embodiment, the third control module is further configured to control the target expansion valve to operate at the second preset opening degree for the first preset time period when the refrigeration ratio is smaller than the preset ratio; wherein the second preset opening degree is zero; and after the target expansion valve operates at the second preset opening degree for a first preset time, controlling the target expansion valve to operate at the first preset opening degree.
In one embodiment, the heat exchange assembly comprises: the first port of the heat exchanger is connected with an outdoor unit expansion valve pipeline, the second port of the heat exchanger is connected with an indoor unit expansion valve pipeline, the third port of the heat exchanger is connected with an outdoor unit expansion valve pipeline, and the fourth port of the heat exchanger is connected with an air distribution pipeline; the first port is communicated with the second port, and the third port is communicated with the fourth port; the first control module 41 is further configured to control the solenoid valve to open when the target expansion valve operates at the first preset opening degree, and control the supercooling valve to operate at the third preset opening degree; the electromagnetic valve is arranged on a pipeline between the fourth port and the air separator, and the supercooling valve is arranged on a pipeline between the third port and the outdoor unit expansion valve.
In an embodiment, the second control module 43 is further configured to determine whether the current actual supercooling degree is smaller than the preset supercooling degree after the supercooling valve operates at the third preset opening degree for the second preset time period; and when the actual supercooling degree is smaller than the preset supercooling degree, controlling the supercooling valve to increase a fourth preset opening degree, or controlling the supercooling valve to increase a fifth preset opening degree at every preset time interval until the actual supercooling degree is increased to be larger than or equal to the preset supercooling degree.
In an embodiment, the second control module 43 is further configured to control the supercooling valve to keep operating at the current opening degree for a third preset time period when the actual supercooling degree is greater than or equal to the preset supercooling degree.
The noise reduction control device of the multi-connected air conditioner provided by the embodiment improves noise by performing noise improvement after the oil return stage is finished, on one hand, the misjudgment that the system lacks a refrigerant is avoided, and a large expansion valve is opened, on the other hand, the refrigerant entering the indoor unit is in a liquid state by improving the supercooling degree, the noise is low, the noise of the indoor unit is reduced, and the comfort level of a user is improved.
The embodiment further 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 embodiment of the noise reduction control method for a multi-connected air conditioner, 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.
The embodiments in the present description 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. The noise reduction control device of the multi-connected air conditioner and the multi-connected air conditioner disclosed by the embodiment correspond to the noise reduction control method of the multi-connected air conditioner disclosed by the embodiment, so that the description is relatively simple, and 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. The noise reduction control method of the multi-connected air conditioner is characterized by being applied to the multi-connected air conditioner, wherein a heat exchange assembly is arranged between an outdoor unit expansion valve and an indoor unit expansion valve of the multi-connected air conditioner, and the method comprises the following steps:
when the multi-connected air conditioner exits the oil return stage, controlling the heat exchange assembly to start to operate;
monitoring the actual supercooling degree of the multi-connected air conditioner;
and when the actual supercooling degree is smaller than the preset supercooling degree, controlling the actual supercooling degree to be increased to be larger than or equal to the preset supercooling degree based on the heat exchange assembly so as to enable the refrigerant entering the indoor unit to be in a liquid state.
2. The noise reduction control method of a multi-connected air conditioner as claimed in claim 1, wherein before the step of controlling the heat exchange assembly to start operating, the method further comprises:
when the multi-connected air conditioner exits the oil return stage, detecting the opening and closing states of indoor units of the multi-connected air conditioner;
and controlling the opening degree of the expansion valve of each indoor unit according to the opening and closing state.
3. The noise reduction control method of a multi-connected air conditioner as claimed in claim 2, wherein the step of controlling the valve opening degree of each indoor unit expansion valve according to the open/close state comprises:
calculating the total refrigerating capacity of a target indoor unit based on the opening and closing state of each indoor unit to obtain a first refrigerating capacity, and calculating the ratio of the first refrigerating capacity to the total refrigerating capacity of the multi-connected air conditioner to obtain a refrigerating ratio;
the target indoor unit is an indoor unit in a starting state;
when the refrigeration ratio is larger than or equal to a preset ratio, controlling the target expansion valve to operate at a first preset opening degree; wherein the target expansion valve is an expansion valve of the target indoor unit.
4. The noise reduction control method of a multi-connected air conditioner as claimed in claim 3, further comprising:
when the refrigeration ratio is smaller than the preset ratio, controlling the target expansion valve to operate at a second preset opening degree for a first preset time; wherein the second preset opening degree is zero;
and after the target expansion valve operates at the second preset opening degree for the first preset time, controlling the target expansion valve to operate at the first preset opening degree.
5. The noise reduction control method of a multi-connected air conditioner as claimed in claim 4, wherein the heat exchange assembly includes a heat exchanger, a solenoid valve and a supercooling valve, a first port of the heat exchanger is connected to the outdoor unit expansion valve pipe, a second port of the heat exchanger is connected to the indoor unit expansion valve pipe, a third port of the heat exchanger is connected to the outdoor unit expansion valve pipe, and a fourth port of the heat exchanger is connected to the air distribution pipe; the first port is in communication with the second port, and the third port is in communication with the fourth port;
the step of controlling the heat exchange assembly to start operating comprises the following steps:
when the target expansion valve operates at the first preset opening degree, controlling the electromagnetic valve to be opened, and controlling the supercooling valve to operate at a third preset opening degree; the electromagnetic valve is arranged on a pipeline between the fourth port and the air separator, and the supercooling valve is arranged on a pipeline between the third port and the outdoor unit expansion valve.
6. The noise reduction control method of a multi-connected air conditioner according to claim 5, wherein the step of controlling the actual supercooling degree to be increased to or greater than a preset supercooling degree based on the heat exchange assembly when the actual supercooling degree is less than the preset supercooling degree comprises:
when the supercooling valve operates for a second preset time at the third preset opening degree, judging whether the current actual supercooling degree is smaller than the preset supercooling degree;
and when the actual supercooling degree is smaller than the preset supercooling degree, controlling the supercooling valve to increase a fourth preset opening degree, or controlling the supercooling valve to increase a fifth preset opening degree at every preset time interval until the actual supercooling degree is increased to be larger than or equal to the preset supercooling degree.
7. The noise reduction control method of a multi-connected air conditioner as claimed in claim 6, further comprising:
and when the actual supercooling degree is more than or equal to the preset supercooling degree, controlling the supercooling valve to keep the current opening operation within a third preset time.
8. The utility model provides a controlling means that makes an uproar falls in many online air conditioners which characterized in that is applied to many online air conditioners, be provided with heat exchange assemblies between many online air conditioners's off-premises station expansion valve and the indoor set expansion valve, the device includes:
the first control module is used for controlling the heat exchange assembly to start to operate when the multi-connected air conditioner exits the oil return stage;
the monitoring module is used for monitoring the actual supercooling degree of the multi-connected air conditioner;
and the second control module is used for controlling the actual supercooling degree to be more than or equal to the preset supercooling degree based on the heat exchange assembly when the actual supercooling degree is less than the preset supercooling degree so as to ensure that the refrigerant entering the indoor unit is in a liquid state.
9. A multi-connected air conditioner comprising a heat exchanger, a solenoid valve, an supercooling valve, a computer readable storage medium storing a computer program, and a processor, wherein the computer program is read by the processor and executed to implement the method according to any one of claims 1 to 7;
the heat exchanger is arranged between an outdoor unit expansion valve and an indoor unit expansion valve, a first port of the heat exchanger is connected with the outdoor unit expansion valve through a pipeline, a second port of the heat exchanger is connected with the indoor unit expansion valve through a pipeline, a third port of the heat exchanger is connected with the outdoor unit expansion valve through a pipeline, and a fourth port of the heat exchanger is connected with an air distribution pipeline; the first port is in communication with the second port, and the third port is in communication with the fourth port;
the electromagnetic valve is arranged on a pipeline between the fourth port and the air separator, and the supercooling valve is arranged on a pipeline between the third port and the outdoor unit expansion valve.
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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Effective date of registration: 20221019 Address after: 315191 No. 1166 Mingguang North Road, Jiangshan Town, Ningbo, Zhejiang, Yinzhou District Patentee after: NINGBO AUX ELECTRIC Co.,Ltd. Patentee after: AUX AIR CONDITIONING LIMITED BY SHARE Ltd. Address before: 315191 No. 1166 Mingguang North Road, Jiangshan Town, Ningbo, Zhejiang, Yinzhou District Patentee before: NINGBO AUX ELECTRIC Co.,Ltd. Patentee before: Ningbo Oxfam intelligent commercial air conditioning manufacturing Co.,Ltd. |