CN111637527A - Accurate control method of multi-split system - Google Patents
Accurate control method of multi-split system Download PDFInfo
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- CN111637527A CN111637527A CN202010478662.5A CN202010478662A CN111637527A CN 111637527 A CN111637527 A CN 111637527A CN 202010478662 A CN202010478662 A CN 202010478662A CN 111637527 A CN111637527 A CN 111637527A
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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
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
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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
- F24F11/62—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
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its 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
- 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
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
Abstract
The invention discloses an accurate control method of a multi-split system, wherein the multi-split system comprises an outdoor unit and an indoor unit consisting of a plurality of indoor units, wherein each indoor unit is provided with an electronic expansion valve, and each indoor unit can be switched between the working modes of a common air duct machine or a new air fan as required; the control method comprises the following steps: the operation state of the multi-split air-conditioning system, the operation quantity of the indoor units in power-on operation and the working modes corresponding to the indoor units are detected at intervals for a set time, then the opening degree of the electronic expansion valve of each indoor unit in power-on operation is correspondingly adjusted according to the detection condition, the new fan and the common air duct machine are mixed in the same multi-split air-conditioning system, reasonable refrigerant adjustment of the indoor units is realized by reasonably and accurately dynamically adjusting the opening degree of the electronic expansion valve of the indoor units, and therefore the air outlet temperature of the new fan and the air duct machine is ensured, and the comfortable air supply temperature of the new fan and the common air duct machine is achieved.
Description
Technical Field
The invention relates to the technical field of multi-online systems, in particular to a method for accurately controlling a multi-online system.
Background
The return air of the indoor unit of a general air conditioner is air in an indoor room, and the air circulates indoors all the time and is generally not fresh; a comfortable indoor environment usually requires a certain amount of fresh air entering a room through the outside, and a fresh air blower is usually installed to obtain fresh air.
The return air inlet of the fresh air machine of the air conditioner needs to be connected with an air inlet to introduce fresh air into an indoor room from the outdoor side, and when the single outdoor side environment temperature is higher than that of the indoor room (for example, the outdoor environment temperature is 40 ℃ and the indoor environment temperature is 27 ℃), the return air temperature of the indoor machine of the fresh air machine is 40 ℃, the return air temperature of the common indoor machine is 27 ℃ and the outlet air temperature of the indoor machine of the fresh air machine is higher than that of the common indoor machine under the same condition. The common method is that a fresh air machine is independently used as a set of system, and a common air duct machine is independently used as a set of system.
The outdoor unit in the multi-split system can be matched with a plurality of indoor units, and the multi-split system has better performance. Due to the large difference between the return air temperature of the fresh air fan and the return air temperature of the common indoor unit, if the fresh air fan and the common indoor unit are installed in a mixed mode in the same system, mutual influence is caused, on one hand, the temperature of air sent out by the fresh air fan is not too high, on the other hand, the temperature of air sent out by the common indoor unit is not too high, and on the other hand, human body induction is not cool. Therefore, the indoor units installed in a matching manner in a general multi-split system are all installed with indoor units (ordinary indoor units) of ordinary indoor return air or indoor units (fresh air machines) of outdoor ambient air. Because the multi-connected outdoor unit can be matched with a plurality of indoor units, if the problem that the indoor units are provided with the new fans and the common air duct machines can be solved, the system can have the functions of all the multi-connected units, and meanwhile, because the new fans and the air duct machines share one multi-connected outdoor unit, two sets of systems do not need to be installed, and the equipment investment and the installation cost can be greatly reduced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a multi-split system and a control method, wherein an indoor unit of the multi-split system can be independently matched with a new fan, can also be independently matched with a common air duct machine, can also be mixed and matched with the new fan and the common air duct machine, ensures the refrigerant distribution of the new fan and the common indoor unit, and ensures that air sent out by the new fan and the common air duct machine has better comfort.
In order to achieve the above object, the present invention provides a method for accurately controlling a multi-split system, where the multi-split system includes an outdoor unit and an indoor unit set composed of a plurality of indoor units, each indoor unit is configured with an electronic expansion valve, and each indoor unit can be switched between the working modes of a common air duct machine or a new air blower as required; the control method comprises the following steps: the operation state of the multi-split air-conditioning system, the operation number of the indoor units in power-on operation and the working mode corresponding to each indoor unit are detected once every a set interval of rated time, and then the opening degree of the electronic expansion valve of each indoor unit in power-on operation is correspondingly adjusted according to the detection condition.
Further, the control method comprises the following steps: step A, detecting the running state of the multi-split air-conditioning system, the power-on running number of the indoor units and the working mode corresponding to each indoor unit at intervals of a rated time; and B, enabling each indoor unit which is electrically operated to correspondingly adjust the opening degree of each electronic expansion valve within a preset opening degree adjusting range according to the detection condition of the step A, wherein based on the detection condition of the step A, the indoor units are firstly divided according to the heating operation state or the cooling operation state, and then are divided according to the heating operation state or the cooling operation state, and the operation number and the operation mode, so that the opening degree of each electronic expansion valve is correspondingly adjusted.
Further, in the step B, when the multi-split air conditioner system is in a cooling operation state, the multi-split air conditioner system is divided based on the operation number and the operation mode detected in the step a, wherein when only one of the indoor units in power-on operation is in the operation mode of the common air conditioner or/and one of the indoor units in the operation mode of the new air conditioner, the electronic expansion valve of each indoor unit at the time continuously operates according to a predetermined opening degree; when only at least two indoor units in power-on operation are in the working mode of the fresh air fan and are not in the working mode of the common air duct machine, calculating and confirming the average value T1 of the outlet temperature of the heat exchanger of each indoor unit in power-on operation, and adjusting the opening degree of the electronic expansion valve correspondingly according to the temperature difference value between the real-time outlet temperature TA of the heat exchanger and the average value T1 of each indoor unit at the moment; when only at least two indoor units in power-on operation are in the working mode of the common air duct machine and are not in the working mode of the new air fan, calculating and confirming the average value T2 of the outlet temperature of the heat exchanger of each indoor unit in power-on operation, and adjusting the opening degree of the electronic expansion valve correspondingly according to the temperature difference value between the outlet temperature TA of the heat exchanger and the average value T2 in real time of each indoor unit at the moment; when at least two indoor units in power-on operation are in the working mode of the common air duct machine and at least one indoor unit in the working mode of the fresh air fan, the opening degree of the electronic expansion valve is correspondingly adjusted according to the temperature difference value between the real-time heat exchanger outlet temperature TA of each indoor unit and the average value T3 at the moment based on the average value T3 of the heat exchanger outlet temperature of each indoor unit in the working mode of the common air duct machine.
Further, any indoor unit is divided into the following conditions in advance based on the temperature difference value between the heat exchanger outlet temperature TA and the average value T1: when the temperature TA-average value T1 of the outlet of the heat exchanger is larger than a first temperature difference K1, the opening degree of the electronic expansion valve of the indoor unit is increased on the basis of the current opening degree; when the first temperature difference K1 is larger than or equal to the heat exchanger outlet temperature TA-average value T1 is larger than or equal to the second temperature difference K2, the electronic expansion valve of the indoor unit maintains the current opening degree; when the first temperature difference K2 is greater than the heat exchanger outlet temperature TA-average value T1, the electronic expansion valve of the indoor unit is reduced in opening degree based on the current opening degree.
Further, any indoor unit is divided into the following conditions in advance based on the temperature difference value between the heat exchanger outlet temperature TA and the average value T2: when the temperature TA-average value T2 of the outlet of the heat exchanger is larger than the third temperature difference K3, the opening degree of the electronic expansion valve of the indoor unit is increased on the basis of the current opening degree; when the fourth temperature difference K3 is larger than or equal to the heat exchanger outlet temperature TA-average value T2 is larger than or equal to the third temperature difference K4, the electronic expansion valve of the indoor unit maintains the current opening degree; and when the fourth temperature difference K4 is more than the heat exchanger outlet temperature TA-average value T2, the electronic expansion valve of the indoor unit reduces the opening degree based on the current opening degree.
Further, any indoor unit is divided into the following conditions in advance based on the temperature difference value between the heat exchanger outlet temperature TA and the average value T3: when the temperature TA-average value T3 of the outlet of the heat exchanger is larger than the fifth temperature difference K5, the opening degree of the electronic expansion valve of the indoor unit is increased on the basis of the current opening degree; when the sixth temperature difference K5 is larger than or equal to the heat exchanger outlet temperature TA-average value T3 is larger than or equal to the fifth temperature difference K6, the electronic expansion valve of the indoor unit maintains the current opening degree; and when the sixth temperature difference K6 is larger than the heat exchanger outlet temperature TA-average value T3, the electronic expansion valve of the indoor unit reduces the opening degree based on the current opening degree.
Further, in the step B, if the multi-split air conditioner system is in a heating operation state, dividing based on the operation number and the operation mode detected in the step a, wherein when only one of the indoor units in power-on operation is in the operation mode of the common air conditioner or/and one of the indoor units in the operation mode of the new air conditioner, the electronic expansion valve of each indoor unit at the time continuously operates according to a predetermined opening degree; when only at least two indoor units in power-on operation are in the working mode of the fresh air fan and are not in the working mode of the common air duct machine, calculating and confirming an average value T4 of the temperatures of the middle parts of the heat exchangers of all the indoor units in power-on operation, and correspondingly adjusting the opening degree of the electronic expansion valve according to the temperature difference value between the real-time temperature TB of the middle part of the heat exchanger of each indoor unit and the average value T4; when only at least two indoor units in power-on operation are in the working mode of the common air duct machine and are not in the working mode of the new air fan, calculating and confirming an average value T5 of the outlet temperature of the heat exchanger of each indoor unit in power-on operation, and adjusting the opening degree of the electronic expansion valve correspondingly according to the real-time temperature difference value between the middle temperature TB of the heat exchanger and the average value T5 of each indoor unit at the moment; when at least two indoor units in power-on operation are in the working mode of the common air duct machine and at least one indoor unit in the working mode of the fresh air fan, the opening degree of the electronic expansion valve is correspondingly adjusted according to the temperature difference value between the real-time middle temperature TB of the heat exchanger of each indoor unit and the average value T6 only based on the average value T6 of the outlet temperature of the heat exchanger of each indoor unit in the working mode of the common air duct machine.
Further, any indoor unit is divided into the following conditions in advance based on the temperature difference value between the heat exchanger middle temperature TB and the average value T4: when the temperature TB-average value T4 of the middle part of the heat exchanger is larger than a first temperature difference K1, the opening degree of the electronic expansion valve of the indoor unit is reduced on the basis of the current opening degree; when the first temperature difference K1 is larger than or equal to the middle temperature TB-average value T4 of the heat exchanger and larger than or equal to the second temperature difference K2, the electronic expansion valve of the indoor unit maintains the current opening degree; and when the first temperature difference K1 is larger than the heat exchanger middle temperature TB-average value T4, the electronic expansion valve of the indoor unit increases the opening degree based on the current opening degree.
Further, any indoor unit is divided into the following conditions in advance based on the temperature difference value between the heat exchanger middle temperature TB and the average value T5: when the middle temperature TB-average value T5 of the heat exchanger is larger than the third temperature difference K3, the opening degree of the electronic expansion valve of the indoor unit is reduced on the basis of the current opening degree; when the fourth temperature difference K3 is larger than or equal to the middle temperature TB-average value T5 of the heat exchanger and larger than or equal to the third temperature difference K4, the electronic expansion valve of the indoor unit maintains the current opening degree; and when the fourth temperature difference K4 is more than the heat exchanger middle temperature TB-average value 5, the electronic expansion valve of the indoor unit increases the opening degree based on the current opening degree.
Further, any indoor unit is divided into the following conditions in advance based on the temperature difference value between the heat exchanger middle temperature TB and the average value T6: when the middle temperature TB-average value T6 of the heat exchanger is larger than a fifth temperature difference K5, the opening degree of the electronic expansion valve of the indoor unit is reduced on the basis of the current opening degree; when the sixth temperature difference K5 is larger than or equal to the middle temperature TB-average value T6 of the heat exchanger and is larger than or equal to the fifth temperature difference K6, the electronic expansion valve of the indoor unit maintains the current opening degree; and when the sixth temperature difference K6 is larger than the heat exchanger middle temperature TB-average value T6, the electronic expansion valve of the indoor unit increases the opening degree based on the current opening degree.
Further, the actual superheat SH \ actual subcooling SC is the difference between the outlet temperature TB and the inlet temperature T2.
The invention adopts the scheme, and has the beneficial effects that: the novel air blower and the common air duct machine are mixed in the same multi-split system, reasonable refrigerant regulation of the indoor machine is realized by reasonably and accurately dynamically adjusting the opening of the electronic expansion valve of the indoor machine, so that the air outlet temperature of the novel air blower and the air outlet temperature of the common air duct machine are ensured, and the comfortable air supply temperature of the novel air blower and the common air duct machine is achieved.
Drawings
FIG. 1 is a schematic diagram of a multi-split air conditioner according to the present invention.
Fig. 2 is a flow chart illustrating a refrigerant distribution control method according to the present invention.
The system comprises an outdoor unit 1, an indoor unit 2 and an electronic expansion valve 21.
Detailed Description
To facilitate an understanding of the invention, the invention is described more fully below with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete.
Referring to fig. 1 to 2, the multi-split system of the present embodiment includes an outdoor unit 1 and a plurality of indoor unit 2 groups consisting of indoor units 2, wherein each of the indoor units 2 is configured with an electronic expansion valve 21, that is, the indoor units 2 are connected in parallel, two ends of each of the indoor unit 2 groups connected in parallel are respectively connected to the outdoor unit 1, and the electronic expansion valve 21 is disposed between one end of each of the indoor units 2 and the indoor unit 2. Each indoor unit 2 can be switched between the working modes of the common air duct machine or the new fan as required, that is, the indoor unit 2 can be correspondingly switched to the working mode of the common air duct machine or the new fan according to the corresponding requirement selected by a user.
Further, a middle temperature sensor is mounted on a middle pipeline of the heat exchanger of each indoor unit 2 and used for detecting and acquiring the middle temperature TB of the heat exchanger of each indoor unit 2; an outlet temperature sensor is arranged on a heat exchanger air pipe of each indoor unit 2 and used for detecting and obtaining the outlet temperature TA of the heat exchanger of each indoor unit 2.
For ease of understanding, the following description will be made in conjunction with the control method of the present embodiment.
In the method for accurately controlling the multi-split air-conditioning system of the embodiment, the operation state of the multi-split air-conditioning system, the operation number of the indoor units 2 in power-on operation and the working mode corresponding to each indoor unit 2 are detected once every a set interval of rated time, and then the opening degree of the electronic expansion valve 21 of each indoor unit 2 in power-on operation is correspondingly adjusted according to the detection condition.
The control method in the embodiment specifically comprises the following steps:
step A, detecting the operation state of the multi-split air-conditioning system, the power-on operation number of the indoor units 2 and the working mode corresponding to each indoor unit 2 at intervals of a rated time, specifically, in the multi-split air-conditioning system detected at each time, the operation state comprises a heating operation state and a cooling operation state, the working mode comprises a common air duct machine or a fresh air machine, and the operation number is the real-time power-on operation number of the indoor units 2.
And step B, enabling each indoor unit 2 in power-on operation to correspondingly adjust the opening of each electronic expansion valve 21 in a preset opening adjusting range according to the detection condition in the step A, wherein based on the detection condition in the step A, the indoor units are firstly divided according to the heating operation state or the cooling operation state, and then are divided according to the heating operation state or the cooling operation state and the operation number and the working mode, so that the opening of each electronic expansion valve 21 is correspondingly adjusted.
In this embodiment, when each indoor unit 2 is initially operated at power-on, the initial opening degree and the opening degree adjustment range of the electronic expansion valve 21 of the indoor unit 2 are calculated and determined based on the capacity of the indoor unit 2 and the current operation mode.
Therefore, in the cooling operation state, the initial opening degree and the openability adjustment range of the electronic expansion valve 21 of the indoor unit 2 switched to the ordinary ducted air conditioner are as follows: (the maximum opening of the electronic expansion valve 21 of this embodiment is 500 pulses, and the adjustment can be made according to the actual production requirement)
| Capacity condition of common ducted air conditioner | Initial opening degree | Minimum regulating opening degree | Maximum regulating opening degree |
| Indoor unit capacity less than or equal to 56KW below 28KW | 400 | 200 | 480 |
| Indoor unit capacity less than or equal to 28KW below 16KW | 400 | 200 | 480 |
| 7.1KW < indoor set capability not more than 16KW | 400 | 200 | 480 |
| 3.6KW < indoor set capability less than or equal to 7.1KW | 300 | 152 | 400 |
| 1.0KW < indoor set capability not more than 3.6KW | 200 | 112 | 400 |
When the indoor unit 2 is switched to the new fan, the initial opening and the openability adjustment range of the electronic expansion valve 21 are as follows:
| power condition of fresh air machine | Initial opening degree | Minimum regulating opening degree | Maximum regulating opening degree |
| Indoor unit capacity less than or equal to 56KW below 28KW | 304 | 152 | 304 |
| Indoor unit capacity less than or equal to 28KW below 16KW | 304 | 152 | 304 |
| 7.1KW < indoor set capability not more than 16KW | 304 | 152 | 304 |
| 3.6KW < indoor set capability less than or equal to 7.1KW | 200 | 112 | 200 |
| 1.0KW < indoor set capability not more than 3.6KW | 152 | 96 | 152 |
In the heating operation state, the initial opening degree and the openability adjustment range of the electronic expansion valve 21 of the indoor unit 2 switched to the ordinary ducted air conditioner are as follows: (the maximum opening of the electronic expansion valve 21 of this embodiment is 500 pulses, and the adjustment can be made according to the actual production requirement)
| Capacity condition of common ducted air conditioner | Initial opening degree | Minimum regulating opening degree | Maximum regulating opening degree |
| Indoor unit capacity less than or equal to 56KW below 28KW | 400 | 200 | 480 |
| Indoor unit capacity less than or equal to 28KW below 16KW | 400 | 200 | 480 |
| 7.1KW < indoor set capability not more than 16KW | 400 | 200 | 480 |
| 3.6KW < indoor set capability less than or equal to 7.1KW | 400 | 144 | 480 |
| 1.0KW < indoor set capability not more than 3.6KW | 400 | 144 | 480 |
In the heating operation state, when the indoor unit 2 is switched to the new fan, the initial opening and the openability adjustment range of the electronic expansion valve 21 are as follows:
| power condition of fresh air machine | Initial opening degree | Minimum regulating opening degree | Maximum regulating opening degree |
| Indoor unit capacity less than or equal to 56KW below 28KW | 300 | 152 | 300 |
| Indoor unit capacity less than or equal to 28KW below 16KW | 300 | 152 | 300 |
| 7.1KW < indoor set capability not more than 16KW | 300 | 152 | 300 |
| 3.6KW < indoor set capability less than or equal to 7.1KW | 248 | 112 | 248 |
| 1.0KW < indoor set capability not more than 3.6KW | 200 | 96 | 200 |
Further, in the step B, when the multi-split air-conditioning system is in a cooling operation state, the division is performed based on the operation number and the operation mode detected in the step a, including the following cases:
1. when only one of the indoor units 2 which are powered on to operate is in the operating mode of the ordinary air pipe machine, the electronic expansion valve 21 of each indoor unit 2 at the time continuously operates according to a preset opening degree, wherein the preset opening degree is the initial opening degree of the electronic expansion valve 21 of the ordinary air pipe machine switched from the indoor unit 2.
2. When only one of the indoor units 2 in power-on operation is in the working mode of the fresh air machine, the electronic expansion valve 21 of each indoor unit 2 at this time continuously operates according to a predetermined opening, where the predetermined opening is determined according to the actual product condition, and for easy understanding, the following description is specifically made with reference to the embodiments:
| new fan capability setting range | Opening degree of operation |
| Indoor unit capacity less than or equal to 56KW below 28KW | 400 |
| Indoor unit capacity less than or equal to 28KW below 16KW | 400 |
| 7.1KW < indoor set capability not more than 16KW | 400 |
| 3.6KW < indoor set capability less than or equal to 7.1KW | 300 |
| 1.0KW < indoor set capability not more than 3.6KW | 200 |
3. When only at least two of the indoor units 2 which are electrically operated are in the working mode of the fresh air fan and are not in the working mode of the common air duct machine, calculating and confirming an average value T1 of the heat exchanger outlet temperatures of the indoor units 2 which are electrically operated, namely, at the moment, each indoor unit 2 sends the heat exchanger outlet temperature TA detected by each indoor unit to a preset central control system for real-time calculation of the average value T1, and each indoor unit 2 correspondingly adjusts the opening degree of the electronic expansion valve 21 according to the temperature difference value between the heat exchanger outlet temperature TA and the average value T1, wherein any indoor unit 2 is divided into the following conditions in advance based on the temperature difference value between the heat exchanger outlet temperature TA and the average value T1: 1) when the heat exchanger outlet temperature TA-mean value T1 > the first temperature difference K1 (TA-T1 > K1, where K1 is preferably 0.5 ℃), the electronic expansion valve 21 of the indoor unit 2 is increased in opening degree (preferably increased by 8 pulsations) based on the current opening degree; 2) when the first temperature difference K1 is more than or equal to the heat exchanger outlet temperature TA-average value T1 is more than or equal to the second temperature difference K2 (K1 is more than or equal to TA-T1 is more than or equal to K2, and K2 is preferably-0.5 ℃), the electronic expansion valve 21 of the indoor unit 2 maintains the current opening degree; 3) when the first temperature difference K1 > the heat exchanger outlet temperature TA-mean value T1 (K2 > TA-T1, K2 is preferably-0.5 c), the electronic expansion valve 21 of the indoor unit 2 is decreased in opening degree (preferably by 8 pulses) on the basis of the current opening degree. In addition, if the electronic expansion valve 21 of the indoor unit 2 has been adjusted to the maximum or minimum opening degree, the operation is continued with the opening degree thereof maintained at the maximum or minimum opening degree.
4. When only at least two of the indoor units 2 which are electrically operated are in the working mode of the common air duct machine and are not in the working mode of the fresh air fan, calculating and confirming an average value T2 of the heat exchanger outlet temperatures of the indoor units 2 which are electrically operated, namely, at the moment, each indoor unit 2 sends the heat exchanger outlet temperature TA detected by each indoor unit to a preset central control system for real-time calculation of the average value T2, and each indoor unit 2 correspondingly adjusts the opening degree of the electronic expansion valve 21 according to the temperature difference value between the heat exchanger outlet temperature TA and the average value T2, wherein any indoor unit 2 is divided into the following conditions in advance based on the temperature difference value between the heat exchanger outlet temperature TA and the average value T2: 1) when the heat exchanger outlet temperature TA-mean value T2 > the third temperature difference K3 (TA-T2 > K3, where K3 is preferably 0.5 ℃), the electronic expansion valve 21 of the indoor unit 2 is increased in opening degree (preferably increased by 8 pulsations) based on the current opening degree; when the fourth temperature difference K3 is more than or equal to the heat exchanger outlet temperature TA-average value T2 is more than or equal to the third temperature difference K4 (K3 is more than or equal to TA-T2 is more than or equal to K4, and K4 is preferably-0.5 ℃), the electronic expansion valve 21 of the indoor unit 2 maintains the current opening degree; when the fourth temperature difference K4 > the heat exchanger outlet temperature TA-mean value T2 (K4 > TA-T2, K4 is preferably-0.5 c), the electronic expansion valve 21 of the indoor unit 2 is decreased in opening degree (preferably by 8 pulses) on the basis of the current opening degree. In addition, if the electronic expansion valve 21 of the indoor unit 2 has been adjusted to the maximum or minimum opening degree, the operation is continued with the opening degree thereof maintained at the maximum or minimum opening degree.
5. When at least two indoor units 2 which are electrically operated are in the working mode of the common air duct machine and at least one indoor unit 2 is in the working mode of the new air blower, the method is based on the average value T3 of the outlet temperature of the heat exchanger of each indoor unit 2 in the working mode of the common air duct machine, namely, the outlet temperature TA of the heat exchanger of each indoor unit 2 in the new air blower does not participate in the calculation of the average value T3 at the moment, and is based on the calculation content of the average value T3 of the outlet temperature of the heat exchanger of each indoor unit 2 in the common air duct machine, therefore, the indoor units 2 in the common air duct machine send the respectively detected outlet temperature TA of the heat exchanger to a preset central control system to perform the real-time calculation of the average value T3, and each indoor unit 2 correspondingly adjusts the opening degree of the electronic expansion valve 21 according to the temperature difference value between the self real, based on the temperature difference between the heat exchanger outlet temperature TA and the average value T3, the following conditions are divided in advance for any indoor unit 2: 1) when the heat exchanger outlet temperature TA-mean value T3 > the fifth temperature difference K5 (TA-T3 > K5, K5 is preferably 0.5 ℃), the electronic expansion valve 21 of the indoor unit 2 is increased in opening degree (preferably increased by 8 pulsations) based on the current opening degree; 2) when the sixth temperature difference K5 is more than or equal to the heat exchanger outlet temperature TA-average value T3 is more than or equal to the fifth temperature difference K6 (K5 is more than or equal to TA-T3 is more than or equal to K6, and K4 is preferably-0.5 ℃), the electronic expansion valve 21 of the indoor unit 2 maintains the current opening degree; 3) when the sixth temperature difference K6 > the heat exchanger outlet temperature TA-mean value T3 (K6 > TA-T3, K6 is preferably-0.5 c), the electronic expansion valve 21 of the indoor unit 2 is reduced in opening degree (preferably by 8 pulsations) based on the current opening degree. In addition, if the electronic expansion valve 21 of the indoor unit 2 has been adjusted to the maximum or minimum opening degree, the operation is continued with the opening degree thereof maintained at the maximum or minimum opening degree.
Further, in step B, when the multi-split air-conditioning system is in a heating operation state, the division is performed based on the operation number and the operation mode detected in step a, including the following cases:
1. when only one of the indoor units 2 which are electrically operated is in the working mode of the ordinary air pipe machine, the electronic expansion valve 21 of each indoor unit 2 at the time is continuously operated according to a preset opening degree, wherein the preset opening degree is the maximum opening degree of the electronic expansion valve 21 of the ordinary air pipe machine switched from the indoor unit 2.
2. When only one of the indoor units 2 in power-on operation is in the working mode of the fresh air machine, the electronic expansion valve 21 of each indoor unit 2 at this time continuously operates according to a predetermined opening, where the predetermined opening is determined according to the actual product condition, and for easy understanding, the following description is specifically made with reference to the embodiments:
| new fan capability setting range | Opening degree of operation |
| Indoor unit capacity less than or equal to 56KW below 28KW | 480 |
| Indoor unit capacity less than or equal to 28KW below 16KW | 480 |
| 7.1KW < indoor set capability not more than 16KW | 480 |
| 3.6KW < indoor set 2 capability less than or equal to 7.1KW | 480 |
| 1.0KW < indoor set capability not more than 3.6KW | 480 |
3. When only at least two of the indoor units 2 which are electrically operated are in the working mode of the fresh air fan and are not in the working mode of the common air duct machine, calculating and confirming an average value T4 of the heat exchanger middle temperature TB of each indoor unit 2 which is electrically operated, namely, each indoor unit 2 sends the heat exchanger middle temperature TB detected by each indoor unit to a preset central control system for real-time calculation of the average value T4, and each indoor unit 2 correspondingly adjusts the opening degree of the electronic expansion valve 21 according to the temperature difference value between the heat exchanger middle temperature TB and the average value T4, wherein any indoor unit 2 is divided into the following conditions in advance based on the temperature difference value between the heat exchanger middle temperature TB and the average value T4: 1) when the heat exchanger middle temperature TB-average value T4 > the first temperature difference K1 (TB-T4 > K1, where K1 is preferably 0.5 ℃), the electronic expansion valve 21 of the indoor unit 2 is reduced in opening degree (preferably reduced by 8 pulsations) based on the current opening degree; 2) when the first temperature difference K1 is more than or equal to the middle temperature TB-average value T4 of the heat exchanger is more than or equal to the second temperature difference K2 (K1 is more than or equal to TB-T4 is more than or equal to K2, and K2 is preferably-0.5 ℃), the electronic expansion valve 21 of the indoor unit 2 maintains the current opening degree; 3) when the first temperature difference K1 > the heat exchanger middle temperature TB-average value T4 (K2 > TB-T4, K2 is preferably-0.5 ℃), the electronic expansion valve 21 of the indoor unit 2 is increased in opening degree (preferably by 8 pulses) based on the current opening degree. In addition, if the electronic expansion valve 21 of the indoor unit 2 has been adjusted to the maximum or minimum opening degree, the operation is continued with the opening degree thereof maintained at the maximum or minimum opening degree.
4. When only at least two of the indoor units 2 which are electrically operated are in the working mode of the common air duct machine and are not in the working mode of the fresh air fan, calculating and confirming an average value T5 of the heat exchanger middle temperature TB of each indoor unit 2 which is electrically operated, namely, each indoor unit 2 sends the heat exchanger middle temperature TB detected by each indoor unit to a preset central control system for real-time calculation of the average value T5, and each indoor unit 2 correspondingly adjusts the opening degree of the electronic expansion valve 21 according to the temperature difference value between the heat exchanger middle temperature TB and the average value T5, wherein any indoor unit 2 is divided into the following conditions in advance based on the temperature difference value between the heat exchanger middle temperature TB and the average value T5: 1) when the heat exchanger middle temperature TB-average value T5 > the third temperature difference K3 (TB-T5 > K3, where K3 is preferably 0.5 ℃), the electronic expansion valve 21 of the indoor unit 2 is reduced in opening degree (preferably reduced by 8 pulsations) based on the current opening degree; when the fourth temperature difference K3 is more than or equal to the middle temperature TB-average value T5 of the heat exchanger and more than or equal to the third temperature difference K4 (K3 is more than or equal to TB-T5 and more than or equal to K4, and K4 is preferably-0.5 ℃), the electronic expansion valve 21 of the indoor unit 2 maintains the current opening degree; when the fourth temperature difference K4 > the heat exchanger middle temperature TB-average value T5 (K4 > TB-T5, K4 is preferably-0.5 ℃), the electronic expansion valve 21 of the indoor unit 2 is increased in opening degree (preferably by 8 pulses) based on the current opening degree. In addition, if the electronic expansion valve 21 of the indoor unit 2 has been adjusted to the maximum or minimum opening degree, the operation is continued with the opening degree thereof maintained at the maximum or minimum opening degree.
5. When at least two indoor units 2 which are electrically operated are in the working mode of the common air duct machine and at least one indoor unit 2 is in the working mode of the new air blower, the average value T6 of the temperatures of the middle parts of the heat exchangers of the indoor units 2 in the working mode of the common air duct machine is only based, namely, the temperature TB of the middle part of the heat exchanger of the indoor unit 2 in the new air blower does not participate in the calculation of the average value T6 at the moment, and the temperature TB of the middle part of the heat exchanger of each indoor unit 2 in the common air duct machine is only based on the calculation content of the average value T6, so that the detected temperature TB of the middle part of the heat exchanger is sent to a preset central control system by the indoor units 2 in the common air duct machine to perform the real-time calculation of the average value T6, and each indoor unit 2 correspondingly adjusts the opening degree of the electronic expansion, based on the temperature difference between the heat exchanger middle temperature TB and the average value T6, the following conditions are divided in advance for any indoor unit 2: 1) when the heat exchanger middle temperature TB-average value T6 is more than the fifth temperature difference K5 (TB-T6 is more than K5, and K5 is preferably 0.5 ℃), the electronic expansion valve 21 of the indoor unit 2 reduces the opening degree (preferably reduces 8 pulsation) based on the current opening degree; 2) when the sixth temperature difference K5 is more than or equal to the middle temperature TB-average value T6 of the heat exchanger is more than or equal to the fifth temperature difference K6 (K5 is more than or equal to TB-T6 is more than or equal to K6, and K4 is preferably-0.5 ℃), the electronic expansion valve 21 of the indoor unit 2 maintains the current opening degree; 3) when the sixth temperature difference K6 > the heat exchanger middle temperature TB-average value T6 (K6 > TB-T6, K6 is preferably-0.5 ℃), the electronic expansion valve 21 of the indoor unit 2 is increased in opening degree (preferably by 8 pulsations) based on the current opening degree. In addition, if the electronic expansion valve 21 of the indoor unit 2 has been adjusted to the maximum or minimum opening degree, the operation is continued with the opening degree thereof maintained at the maximum or minimum opening degree.
Based on the above 5 conditions in the cooling operation state and the 5 conditions in the heating operation state, the electronic expansion valve 21 is continuously and dynamically adjusted at intervals of a rated time (preferably 1 min) by the multi-split system, so that the opening of the electronic expansion valve 21 is reasonably and accurately dynamically adjusted, and the reasonable refrigerant adjustment of the indoor unit 2 is realized.
The above-described embodiments are merely preferred embodiments of the present invention, which is not intended to limit the present invention in any way. Those skilled in the art can make many changes, modifications, and equivalents to the embodiments of the invention without departing from the scope of the invention as set forth in the claims below. Therefore, equivalent changes made according to the spirit of the present invention should be covered within the protection scope of the present invention without departing from the contents of the technical scheme of the present invention.
Claims (10)
1. The accurate control method of the multi-split system is characterized by comprising the following steps: the multi-split system comprises an outdoor unit (1) and an indoor unit (2) group consisting of a plurality of indoor units (2), wherein each indoor unit (2) is provided with an electronic expansion valve (21), and each indoor unit (2) can be switched between the working modes of a common air duct machine or a new fan as required;
the control method comprises the following steps: the operation state of the multi-split air-conditioning system, the operation number of the indoor units (2) in power-on operation and the working mode corresponding to each indoor unit (2) are detected once every a set interval of rated time, and then the opening degree of the electronic expansion valve (21) of each indoor unit (2) in power-on operation is correspondingly adjusted according to the detection condition.
2. The method for accurately controlling a multi-split system according to claim 1, wherein: the control method comprises the following steps:
step A, detecting the running state of the multi-split air-conditioning system, the power-on running number of the indoor units (2) and the working mode corresponding to each indoor unit (2) at intervals of a rated time;
and B, enabling each indoor unit (2) which is electrically operated to correspondingly adjust the opening degree of each electronic expansion valve (21) in a preset opening degree adjusting range according to the detection condition of the step A, wherein based on the detection condition of the step A, the indoor units are firstly divided according to the heating operation state or the cooling operation state, and then are divided according to the heating operation state or the cooling operation state and the operation number and the working mode, so that the opening degree of each electronic expansion valve (21) is correspondingly adjusted.
3. The method for accurately controlling a multi-split system as set forth in claim 2, wherein: in the step B, when the multi-split air conditioner system is in a refrigerating operation state, the multi-split air conditioner system is divided based on the operation number and the operation mode detected in the step A, wherein when only one of the indoor units (2) in power-on operation is in the operation mode of the common air duct machine or/and one of the indoor units in the operation mode of the new fan, the electronic expansion valve (21) of each indoor unit (2) at the moment continuously operates according to a preset opening degree; when only at least two indoor units (2) in power-on operation are in the working mode of a fresh air fan and are not in the working mode of a common air duct machine, calculating and confirming the average value T1 of the outlet temperature of the heat exchanger of each indoor unit (2) in power-on operation, and adjusting the opening degree of the electronic expansion valve (21) correspondingly by each indoor unit (2) according to the temperature difference value between the real-time outlet temperature TA of the heat exchanger and the average value T1; when only at least two indoor units (2) in power-on operation are in the working mode of the common air duct machine and are not in the working mode of the new air fan, calculating and confirming the average value T2 of the outlet temperature of the heat exchanger of each indoor unit (2) in power-on operation, and adjusting the opening degree of the electronic expansion valve (21) correspondingly by each indoor unit (2) according to the temperature difference value between the real-time outlet temperature TA of the heat exchanger and the average value T2; when at least two indoor units (2) in power-on operation are in the working mode of the common air duct machine and at least one indoor unit (2) in the working mode of the fresh air fan, the opening degree of the electronic expansion valve (21) is correspondingly adjusted according to the temperature difference value between the real-time heat exchanger outlet temperature TA of each indoor unit (2) and the average value T3 at the moment based on the average value T3 of the heat exchanger outlet temperatures of all the indoor units (2) in the working mode of the common air duct machine.
4. The method for accurately controlling a multi-split system according to claim 4, wherein: based on the temperature difference value between the heat exchanger outlet temperature TA and the average value T1, the following conditions are divided in advance for any indoor unit (2): when the heat exchanger outlet temperature TA-average value T1 is larger than the first temperature difference K1, the electronic expansion valve (21) of the indoor unit (2) increases the opening degree on the basis of the current opening degree; when the first temperature difference K1 is larger than or equal to the heat exchanger outlet temperature TA-average value T1 is larger than or equal to the second temperature difference K2, the electronic expansion valve (21) of the indoor unit (2) maintains the current opening degree; when the first temperature difference K2 is greater than the heat exchanger outlet temperature TA-average value T1, the electronic expansion valve (21) of the indoor unit (2) is reduced in opening degree based on the current opening degree.
5. The method for accurately controlling a multi-split system according to claim 4, wherein: based on the temperature difference value between the heat exchanger outlet temperature TA and the average value T2, the following conditions are divided in advance for any indoor unit (2): when the heat exchanger outlet temperature TA-average value T2 is larger than the third temperature difference K3, the electronic expansion valve (21) of the indoor unit (2) increases the opening degree on the basis of the current opening degree; when the fourth temperature difference K3 is larger than or equal to the heat exchanger outlet temperature TA-average value T2 is larger than or equal to the third temperature difference K4, the electronic expansion valve (21) of the indoor unit (2) maintains the current opening degree; when the fourth temperature difference K4 is greater than the heat exchanger outlet temperature TA-average value T2, the electronic expansion valve (21) of the indoor unit (2) is reduced in opening degree based on the current opening degree.
6. The method for accurately controlling a multi-split system according to claim 4, wherein: based on the temperature difference value between the heat exchanger outlet temperature TA and the average value T3, the following conditions are divided in advance for any indoor unit (2): when the heat exchanger outlet temperature TA-average value T3 is larger than the fifth temperature difference K5, the electronic expansion valve (21) of the indoor unit (2) increases the opening degree on the basis of the current opening degree; when the sixth temperature difference K5 is larger than or equal to the heat exchanger outlet temperature TA-average value T3 is larger than or equal to the fifth temperature difference K6, the electronic expansion valve (21) of the indoor unit (2) maintains the current opening degree; when the sixth temperature difference K6 is greater than the heat exchanger outlet temperature TA-average value T3, the electronic expansion valve (21) of the indoor unit (2) is reduced in opening degree based on the current opening degree.
7. The method for accurately controlling a multi-split system as set forth in claim 2, wherein: in the step B, if the multi-split air conditioner system is in a heating operation state, dividing based on the operation number and the operation mode detected in the step A, wherein when only one of the indoor units (2) in power-on operation is in the operation mode of the common air duct machine or/and one of the indoor units is in the operation mode of the new fan, the electronic expansion valve (21) of each indoor unit (2) at the moment continuously operates according to a preset opening degree; when only at least two indoor units (2) in power-on operation are in the working mode of a fresh air fan and are not in the working mode of a common air duct machine, calculating and confirming the average value T4 of the temperature of the middle part of the heat exchanger of each indoor unit (2) in power-on operation, and correspondingly adjusting the opening degree of the electronic expansion valve (21) according to the temperature difference value between the real-time temperature TB of the middle part of the heat exchanger of each indoor unit (2) and the average value T4; when only at least two indoor units (2) in power-on operation are in the working mode of the common air duct machine and are not in the working mode of the new air fan, calculating and confirming the average value T5 of the outlet temperature of the heat exchanger of each indoor unit (2) in power-on operation, and correspondingly adjusting the opening degree of the electronic expansion valve (21) according to the temperature difference value between the real-time middle temperature TB of the heat exchanger and the average value T5 of each indoor unit (2); when at least two indoor units (2) in power-on operation are in the working mode of the common air duct machine and at least one indoor unit (2) in the working mode of the fresh air fan, the opening degree of the electronic expansion valve (21) is correspondingly adjusted according to the temperature difference value between the real-time heat exchanger middle temperature TB and the average value T6 of each indoor unit (2) at the moment based on the average value T6 of the heat exchanger outlet temperature of each indoor unit (2) in the working mode of the common air duct machine.
8. The method for accurately controlling a multi-split system as set forth in claim 8, wherein: any indoor unit (2) is divided into the following conditions in advance based on the temperature difference value between the heat exchanger middle temperature TB and the average value T4: when the heat exchanger middle temperature TB-average value T4 is larger than a first temperature difference K1, the electronic expansion valve (21) of the indoor unit (2) reduces the opening degree on the basis of the current opening degree; when the first temperature difference K1 is larger than or equal to the heat exchanger middle temperature TB-average value T4 is larger than or equal to the second temperature difference K2, the electronic expansion valve (21) of the indoor unit (2) maintains the current opening degree; when the first temperature difference K1 is larger than the heat exchanger middle temperature TB-average value T4, the electronic expansion valve (21) of the indoor unit (2) increases the opening degree based on the current opening degree.
9. The method for accurately controlling a multi-split system as set forth in claim 8, wherein: any indoor unit (2) is divided into the following conditions in advance based on the temperature difference value between the heat exchanger middle temperature TB and the average value T5: when the heat exchanger middle temperature TB-average value T5 is larger than the third temperature difference K3, the electronic expansion valve (21) of the indoor unit (2) reduces the opening degree on the basis of the current opening degree; when the fourth temperature difference K3 is larger than or equal to the middle temperature TB-average value T5 of the heat exchanger and larger than or equal to the third temperature difference K4, the electronic expansion valve (21) of the indoor unit (2) maintains the current opening degree; and when the fourth temperature difference K4 is larger than the heat exchanger middle temperature TB-average value 5, the electronic expansion valve (21) of the indoor unit (2) increases the opening degree based on the current opening degree.
10. The method for accurately controlling a multi-split system as set forth in claim 9, wherein: any indoor unit (2) is divided into the following conditions in advance based on the temperature difference value between the heat exchanger middle temperature TB and the average value T6: when the heat exchanger middle temperature TB-average value T6 is larger than the fifth temperature difference K5, the electronic expansion valve (21) of the indoor unit (2) reduces the opening degree on the basis of the current opening degree; when the sixth temperature difference K5 is larger than or equal to the heat exchanger middle temperature TB-average value T6 is larger than or equal to the fifth temperature difference K6, the electronic expansion valve (21) of the indoor unit (2) maintains the current opening degree; and when the sixth temperature difference K6 is larger than the heat exchanger middle temperature TB-average value T6, the electronic expansion valve (21) of the indoor unit (2) increases the opening degree based on the current opening degree.
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Address after: No. 1 by villagers' group of helongsha, Shengli village, Lishui Town, Nanhai District, Foshan City, Guangdong Province Patentee after: Guangdong Kaili HVAC Co.,Ltd. Address before: No. 1 by villagers' group of helongsha, Shengli village, Lishui Town, Nanhai District, Foshan City, Guangdong Province Patentee before: GUANGDONG CHIGO HEATING AND VENTILATION EQUIPMENT Co.,Ltd. |