CN115523599B - Control method and control device for multi-connected air conditioner, air conditioner and storage medium - Google Patents

Control method and control device for multi-connected air conditioner, air conditioner and storage medium Download PDF

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Publication number
CN115523599B
CN115523599B CN202211046512.2A CN202211046512A CN115523599B CN 115523599 B CN115523599 B CN 115523599B CN 202211046512 A CN202211046512 A CN 202211046512A CN 115523599 B CN115523599 B CN 115523599B
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temperature
coil
electronic expansion
expansion valve
class
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CN115523599A (en
Inventor
吉金浩
姚光森
李龙威
常卫峰
肖旭东
鲍洋
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Ningbo Aux Electric Co Ltd
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Ningbo Aux Electric Co Ltd
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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
    • 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
    • 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
    • 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
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Human Computer Interaction (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention provides a control method, a device and equipment of a multi-connected air conditioner, relates to the technical field of air conditioners, and is designed for solving the problem that the operation effect of an indoor unit operated by an electronic expansion valve of the indoor unit stopped is poor due to the fact that the electronic expansion valve of the indoor unit is not tightly closed. The control method comprises the following steps: acquiring the temperatures of first coils of a plurality of first-class indoor units and the step numbers of first-class electronic expansion valves; if the step number of the first-class electronic expansion valve is increasing and the increasing speed of the temperature of the first coil is greater than the preset heating speed, controlling the second-class electronic expansion valve to reset. The control method of the multi-connected air conditioner can timely seal the electronic expansion valve of the stopped indoor unit, and improves the operation effect of the indoor unit.

Description

Control method and control device for multi-connected air conditioner, air conditioner and storage medium
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method and device of a multi-connected air conditioner, the air conditioner and a storage medium.
Background
The multi-split air conditioner is characterized in that the inner machine side can be connected with a plurality of indoor machines with electronic expansion valves, the valve steps can be biased due to the characteristics of the electronic expansion valves in an open state for a long time, after the multi-split air conditioner is shut down, the control display is 0PLS, and the actual valve steps are not closed.
The current resetting mode is that the electronic expansion valve executes resetting action after power-off and power-on are needed. The method has the defects that the internal machine cannot automatically recognize the reset action in the operation process, the reset action is executed after the manual power-off and the power-on are manually judged to be needed to reset, and at the moment, all the internal machines are stopped, so that the indoor temperature is fluctuated, and the effect is poor; during refrigeration, if the electronic expansion valve of the internal machine is not closed during the stop, refrigerant flows through, liquid accumulation can be caused for a long time, and the compressor is damaged or other internal machine effects are poor.
Disclosure of Invention
The first object of the present invention is to provide a control method for a multi-connected air conditioner, so as to solve the technical problem that the operation effect of an indoor unit is deteriorated due to the fact that an electronic expansion valve of the indoor unit is not tightly closed.
In order to solve the technical problems, the invention provides a control method of a multi-connected air conditioner, comprising the following steps:
The control method of the multi-connected air conditioner comprises an outdoor unit and a plurality of indoor units, wherein the indoor units comprise a first indoor unit and a second indoor unit, the first indoor unit is the indoor unit operated during refrigeration, the second indoor unit is the indoor unit stopped during refrigeration, the first indoor unit comprises a first electronic expansion valve, and the second indoor unit comprises a second electronic expansion valve;
the control method comprises the following steps:
Acquiring the temperatures of first coils of a plurality of first-class indoor units and the step numbers of first-class electronic expansion valves;
and if the step number of the first-class electronic expansion valve is increased and the increasing speed of the temperature of the first coil is greater than the preset heating speed, controlling the second-class electronic expansion valve to reset.
The control method of the multi-connected air conditioner has the beneficial effects that:
By obtaining the coil temperature of the first-class indoor unit and based on the temperature difference of the first measurement period fixed at intervals, namely, the comparison of the increasing speed of the first coil temperature and the preset heating speed, when the increasing speed of the first coil temperature exceeds the preset heating speed, refrigerant flows are indicated to exist in the second-class indoor units which are stopped besides the first-class indoor units, but the second-class electronic expansion valve is nominally closed, so that leakage occurs when the second-class electronic expansion valve is not tightly closed. Therefore, the second-class electronic expansion valves are controlled to reset, and the electronic expansion valves can be tightly closed to ensure the reliability of control and improve the refrigerating effect of the first-class indoor units.
In a preferred technical solution, the first coil temperature includes a first coil inlet temperature, a first coil outlet temperature, and a first coil center temperature, and the first coil inlet temperature, the first coil outlet temperature, and an average value of increasing speeds of the first coil center temperature.
The inlet temperature, the central temperature and the outlet temperature of the first coil are respectively measured from the inlet, the central position and the outlet position of the first coil, so that errors caused by only measuring local parts of the first coil can be avoided, the measuring accuracy is improved, and the control accuracy is further improved.
In a preferred technical scheme, the first measurement period for detecting the temperature of the first coil is 30-60 seconds; after the first indoor unit of the first type continuously and stably operates for a first preset time period, continuously resetting the second electronic expansion valve if n max first measurement periods meet that the increasing speed of the temperature of the first coil is larger than the preset heating speed and the valve step of the first electronic expansion valve is increased by a number E (0, 10); the preset heating speed is the ratio of a first preset difference value of each first measurement period to the duration of the first measurement period, and the first preset difference value is more than 0 ℃ and less than 3 ℃.
By setting whether the valve step increase number of the first electronic expansion valve in the first measurement period falls within the above-described interval range, erroneous judgment due to valve step change of the first electronic expansion valve during startup of the first electronic expansion valve itself can be prevented. And in addition, the valve step change of the multi-connected air conditioner in the process of normally adjusting the refrigerating capacity of the first indoor unit can be prevented from being caused by matching with the fact that the increasing speed of the temperature of the first coil is larger than the preset heating speed, so that the resetting process is initiated, and the control accuracy is improved.
In a preferred technical solution, the control method further includes:
After the second-class indoor unit is continuously in a stop state for a second preset time period, acquiring the indoor environment temperature and the second coil temperature of the second-class indoor unit, and detecting a second measurement period of the second coil temperature to be 30-60 seconds if the difference between the second coil temperature and the indoor environment temperature of the second-class indoor unit is larger than a second preset difference, wherein the second preset difference is larger than 1 ℃ and smaller than 3 ℃; and if the continuous m max second measurement periods meet that the difference value between the temperature of the second coil pipe and the indoor environment temperature is larger than a second preset difference value, controlling the second-class expansion valve to reset.
By comparing the difference value between the temperature of the second coil pipe in the second-class indoor unit and the indoor environment temperature with a second preset difference value, when the difference value is larger, the second-class electronic expansion valve is not tightly closed, the specific position of the second-class electronic expansion valve which is not normally closed can be accurately locked, and only the second-class electronic expansion valve needs to be reset, so that the impact on the normal operation of the system is reduced, and the system operation stability of the multi-connected air conditioner is improved.
In a preferred technical solution, the controlling the resetting of the second-class electronic expansion valve includes:
Firstly, controlling a second-class electronic expansion valve to close a first preset step number, wherein the first preset step number is the sum of the maximum step number and the preset increment step number of the electronic expansion valve; then, the second-class electronic expansion valve is controlled to be opened for a second preset step number, and then the second-class electronic expansion valve is controlled to be closed for a third preset step number, wherein the maximum step number is larger than the third preset step number, and the third preset step number is larger than the second preset step number.
The second-class electronic expansion valve can be completely closed no matter how far the valve is going to be when the second-class electronic expansion valve is not completely closed. And then the second preset step number is opened and then the third preset step number is closed, so that the second-class electronic expansion valve can be prevented from being blocked and faults occur.
In a preferred technical scheme, the control method further comprises a valve correction step:
Obtaining the inlet pipe temperature difference of the first-class indoor unit which is operated after reset, and controlling the opening degree of the first-class electronic expansion valve to increase a first preset correction step number; the first preset correction step number is positively correlated with the inlet pipe temperature difference and is positively correlated with the indoor environment temperature;
The inlet pipe temperature difference is the difference between the inlet temperature of the first coil pipe of each first-class indoor unit and the average low-pressure temperature of the system.
The electronic expansion valve opening of the first indoor unit with larger inlet pipe temperature difference and higher indoor environment temperature is increased, so that more refrigerant can flow through the electronic expansion valve, the defect that the first indoor unit and the outdoor unit are far away from each other is overcome, and the operation efficiency of the multi-connected air conditioner is improved.
In the preferred technical scheme, an average inlet pipe temperature difference is obtained, the outdoor unit is controlled to increase output so as to reduce low-pressure temperature, and the step number increment of the first-class electronic expansion valve is positively correlated with the average inlet pipe temperature difference; and the average inlet pipe temperature difference is the average difference value between the first indoor unit and the average low-pressure temperature of the system.
When the average pipe inlet temperature difference of all the first indoor units is larger, the opening degree of the first electronic expansion valves of all the first indoor units can be increased, so that the flow of the outdoor unit is increased, and the influence caused by the longer connecting pipes of the first indoor units and the outdoor unit is compensated.
The second object of the present invention is to provide a control device for a multi-connected air conditioner, so as to solve the technical problem that the electronic expansion valve of the indoor unit is not tightly closed, resulting in the poor operation effect of the indoor unit.
The invention provides a control device of a multi-connected air conditioner, which comprises:
the first acquisition module is used for acquiring the first coil temperatures of the plurality of first-class indoor units and the step numbers of the first-class electronic expansion valves;
a first reset module for: and if the step number of the first-class electronic expansion valve is increased and the increasing speed of the temperature of the first coil is greater than the preset heating speed, controlling the second-class electronic expansion valve to reset.
The third object of the present invention is to provide an air conditioner, so as to solve the technical problem that the operation effect of the indoor unit is deteriorated due to the fact that the electronic expansion valve of the indoor unit is not tightly closed.
The air conditioner provided by the invention comprises a computer readable storage medium and a processor, wherein the computer readable storage medium stores a computer program, and the computer program realizes the control method when being read and run by the processor.
A fourth object of the present invention is to provide a computer readable storage medium, so as to solve a technical problem that an electronic expansion valve of a shutdown indoor unit is not closed, resulting in a poor operation effect of the operation indoor unit.
A computer readable storage medium storing a computer program which, when read and executed by a processor, implements the control method described above.
The control device, the air conditioner and the computer readable storage medium of the multi-connected air conditioner can achieve the same technical effects as the control method of the multi-connected air conditioner.
Drawings
In order to more clearly illustrate the technical solutions of embodiments or background art of the present invention, the drawings that are needed in the description of the embodiments or background art will be briefly described below, and it is apparent that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of physical device composition of a control method of a multi-connected air conditioner according to an embodiment of the present invention;
Fig. 2 is a schematic flowchart of a control method of a multi-connected air conditioner according to an embodiment of the present invention;
Fig. 3 is a flow chart of a control method of a multi-connected air conditioner according to an embodiment of the present invention;
Fig. 4 is a schematic structural diagram of a control device of a multi-connected air conditioner according to an embodiment of the present invention.
Reference numerals illustrate:
110-a first class indoor unit; 111-a first class electronic expansion valve; 120-a second-class indoor unit; 121-a second class electronic expansion valve; 130-an outdoor unit;
401-a first acquisition module; 402-a first reset module; 403-a second acquisition module; 404-a second reset module; 405-a correction valve step module; 406-correcting the external machine low-voltage module.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
Fig. 1 is a schematic diagram of entity equipment applied to a control method of a multi-connected air conditioner according to an embodiment of the present invention. The physical device, i.e., the multi-connected air conditioner, includes an outdoor unit 130 and a plurality of indoor units. With the indoor unit during cooling as a division standard, the indoor units include a first indoor unit 110 and a second indoor unit 120, where the first indoor unit 110 is an indoor unit that operates during cooling, and the second indoor unit 120 is an indoor unit that stops during cooling. Of course, the division of the first-type indoor units 110 and the second-type indoor units 120 is not absolutely constant, and this varies with the state of operation or non-operation of each indoor unit. Wherein each first-type indoor unit 110 includes a first-type electronic expansion valve 111, and each second-type indoor unit 120 includes a second-type electronic expansion valve 121. Taking the situation depicted in fig. 1 as an example, several indoor units on the left side in fig. 1 are the first indoor units 110, and several indoor units on the right side are in a stopped state and are the second indoor units 120.
The opening degree of each first-class electronic expansion valve 111 is controlled by how much the first-class electronic expansion valve 111 is opened, and the higher the opening valve step is, the larger the opening length of the first-class electronic expansion valve 111 is, and the flow rate of the refrigerant passing through the first-class indoor unit 110 is increased under the condition that other factors are unchanged. The principle of the second-type electronic expansion valve 121 is similar to that of the first-type electronic expansion valve 111, and will not be described again.
In addition, for the indoor coil of each indoor unit, temperature sensors are provided at the inlet, outlet and center positions of the indoor coil along the flow length to measure the coil inlet temperature, the coil outlet temperature and the coil center temperature, respectively. Accordingly, the coil inlet temperature, the coil outlet temperature, and the coil center temperature may be the first coil inlet temperature Te2 n, the first coil outlet temperature Te1 n, and the first coil center temperature Tm n, or the second coil inlet temperature Te2 m, the second coil outlet temperature Te1 m, and the second coil center temperature Tm m, according to whether the indoor unit in which the indoor coil is installed operates.
Fig. 2 is a schematic flowchart of a control method of a multi-connected air conditioner according to an embodiment of the present invention; as shown in fig. 2, the control method of the multi-connected air conditioner may be applied to the multi-connected air conditioner, where the method includes:
S210, acquiring the temperatures of first coils of a plurality of first-class indoor units and the step number P n of first-class electronic expansion valves;
s220, if the step number P n of the first-class electronic expansion valve is increased and the increasing speed of the temperature of the first coil is greater than the preset heating speed, a reset instruction is sent to the second-class electronic expansion valve.
Wherein the rate of increase of the first coil temperature is reflected by the value of the change in coil temperature within the chamber during a given first measurement cycle. Wherein the first measurement period t n for detecting the first coil temperature is 30-60 seconds, more specifically, may be 40 seconds. Similarly, the preset heating rate is also represented by a first preset difference γ in a first measurement period t n. Specifically, the first preset difference γ is greater than 0 ℃ and less than 3 ℃, and preferably, 1 ℃ may be taken.
In the multi-connected air conditioner, if the stopped indoor unit, namely the second-type electronic expansion valve of the second-type indoor unit leaks, the refrigerant in the system can leak into the second indoor coil of the second-type indoor unit. The total amount of refrigerant running on the first coil of the first indoor unit is insufficient, and the refrigerating capacity is reduced, so that the tube temperature is increased.
Therefore, by obtaining the coil temperature of the first-type indoor unit and based on the difference between the first measurement periods t n at fixed intervals, that is, the comparison of the increasing speed of the first coil temperature with the preset heating speed, when the increasing speed of the first coil temperature exceeds the preset heating speed, it is indicated that refrigerant flows in the second-type indoor unit, which is stopped in addition to the first-type indoor unit, but the second-type electronic expansion valve is nominally closed, thereby indicating that the second-type electronic expansion valve is not actually closed and leakage occurs. Therefore, the second-class electronic expansion valves are reset, and the electronic expansion valves can be tightly closed, so that the control reliability is ensured, and the refrigerating effect of the first-class indoor unit is improved.
The first coil temperature includes a first coil inlet temperature Te2 n, a first coil outlet temperature Te1 n, and a first coil center temperature Tm n, and the rate of increase of the first coil temperature is an average value of the rates of increase of the first coil inlet temperature Te2 n, the first coil outlet temperature Te1 n, and the first coil center temperature Tm n.
Wherein the number of the first measurement periods t n for the first coil temperature of the first indoor unit is n max,nmax, which is 2-5, preferably 4. The first coil inlet temperature, the first coil outlet temperature and the first coil center temperature at each detection are Te2 n、Tmn、Te1n in sequence. The first coil temperature difference measured twice in each first measurement period t n is: deltaT n＝[(Te2n-Te2n-1)+(Tmn-Tmn-1)+(Te1n-Te1n-1) ]/3.
By measuring the inlet temperature Te2 n, the center temperature Tm n and the outlet temperature Te1 n of the first coil pipe from the inlet, the center position and the outlet position of the first coil pipe respectively, errors caused by only measuring local parts of the first coil pipe can be avoided, the measuring accuracy is improved, and the control accuracy is further improved.
Preferably, after the first indoor unit of the first type continuously and stably operates for the first preset time period t 1, n max continuous first measurement periods t n satisfy that the increasing speed of the temperature of the first coil is greater than the preset heating speed in each first measurement period t n, and the valve step of the electronic expansion valve of the first type increases by the number e (0, 10) in each first measurement period t n, and then the electronic expansion valve of the second type is reset.
It should be noted that, after the first indoor unit of the first class continuously and stably operates for the first preset time period t 1, for a certain indoor unit of the first class, after the process of continuously increasing the number of opening steps of the electronic expansion valve of the certain indoor unit of the first class is finished, the continuous operation time of the indoor unit of the first class exceeds the first preset time period t 1. The first preset duration t 1 may be selected from 15 minutes to 30 minutes, specifically, may be selected from 20 minutes.
Since part of refrigerant leaks from the second electronic expansion valve which is closed but not closed, the temperature increasing speed of the first coil is larger than the preset temperature increasing speed, and in order to ensure the refrigerating effect of the first indoor unit, the flow in the first indoor unit is controlled to be increased as compensation, so that the opening amplitude of the first electronic expansion valve is increased, and the valve step is correspondingly increased.
By setting whether the valve step increase number of the first electronic expansion valve in the first measurement period t n belongs to the above-mentioned interval range, misjudgment caused by valve step change of the first electronic expansion valve in the starting process of the first electronic expansion valve can be prevented. And in addition, the valve step change of the multi-connected air conditioner in the process of normally adjusting the refrigerating capacity of the first indoor unit can be prevented from being caused by matching with the fact that the increasing speed of the temperature of the first coil is larger than the preset heating speed, so that the resetting process is initiated, and the control accuracy is improved.
S230, after the second-class indoor unit is continuously in a stop state for a second preset time period t 2, acquiring the indoor environment temperature Tai m and the second coil temperature of the second-class indoor unit, and resetting the second-class expansion valve if the difference between the second coil temperature of the second-class indoor unit and the indoor environment temperature Tai m is larger than a second preset difference epsilon, the second preset difference epsilon is larger than 1 ℃ and smaller than 3 ℃, a second measurement period t m for detecting the second coil temperature is 30-60 seconds, and the continuous m max second measurement periods t m meet the condition that the difference between the second coil temperature and the indoor environment temperature Tai m in each second measurement period t m is larger than the second preset difference epsilon.
The second preset time period t 2 may be 20 to 40 minutes, preferably 30 minutes. The number of second measurement periods t m for the second coil temperature of the second class of indoor units is m max,mmax in the range of 2-5, preferably 4. The second measurement period t m, which detects the second coil temperature, is 30-60 seconds, more specifically, may be 40 seconds. The second coil temperature includes a second coil inlet temperature Te2 m, a second coil outlet temperature Te1 m, and a second coil center temperature Tm m, and the difference between the second coil temperature and the indoor environment temperature Tai m is an average of absolute values of differences between each of the second coil inlet temperature Te2 m, the second coil outlet temperature Te1 m, and the second coil center temperature Tm m and the indoor environment temperature Tai m. I.e. △T2m＝|Te2m-Taim|;△Tmm＝|Tmm-Taim|;△T1m＝|Te1m-Taim|,△Tm＝(△T2m+△Tmm+△T1m)/3. and the second preset difference epsilon may be a value of more than 1 deg.c and less than 3 deg.c, preferably 2 deg.c.
When the valve step of the second-class electronic expansion valve is 0pls, the refrigerating indoor unit is in a stop state, and correspondingly, no refrigerant flows through the second coil pipe. The second coil in this state has a temperature very close to the indoor environment temperature Tai m where the second-class indoor unit is located, for a long period of time, for example, 30min or more. If the second-class electronic expansion valve is nominally closed, but still has an opening in effect, then refrigerant flows through the second coil, and the second coil temperature is reduced to less than the indoor ambient temperature, tai m, at which the second coil is located. In other words, if the temperature of the second coil is found to be significantly lower than the indoor environment temperature Tai m of the space after a long-time shutdown process of one second-class indoor unit, it is indicated that the second-class electronic expansion valve is not closed, and the refrigerant still flows through the second coil.
By comparing the difference value between the temperature of the second coil in the second-class indoor unit and the indoor environment temperature Tai m with a second preset difference value epsilon, when the difference value is larger, the second-class electronic expansion valve is not tightly closed, the specific position of the second-class electronic expansion valve which is not normally closed can be accurately locked, and only the second-class electronic expansion valve needs to be reset, so that the impact on the normal operation of the system is reduced, and the system operation stability of the multi-connected air conditioner is improved.
S240, controlling the second-class electronic expansion valve to reset comprises the following steps:
Firstly, controlling the second-class electronic expansion valve to close a first preset step number, wherein the first preset step number is the sum of the maximum step number Pmax and the preset increment step number of the electronic expansion valve; then, the second-class electronic expansion valve is controlled to be opened by a second preset step number t, the second-class electronic expansion valve is controlled to be closed by a third preset step number t, the maximum step number Pmax is larger than the third preset step number s, and the third preset step number s is larger than the second preset step number t.
The second preset step number t and the third preset step number s are smaller step numbers relative to the maximum step number Pmax of the electronic expansion valve, for example, may be smaller than 1/7 of the maximum step number Pmax. And s may be slightly greater than m, for example, 2% -5% greater than m. The method of confirming the opening degree of the second-class electronic expansion valve and confirming the specific valve steps cannot be known through the temperature change speed of the first-class indoor unit in operation or the difference between the stopped second-class indoor unit and the indoor environment temperature Tai m, so that the electronic expansion valve is closed for a first preset step number first, and complete closing can be ensured.
The second-class electronic expansion valve can be completely closed no matter how far the specific valve is going to be when the second-class electronic expansion valve is not completely closed. And then the second preset step number t is opened, and then the third preset step number s is closed, so that the second-class electronic expansion valve can be prevented from being blocked and causing faults.
S250, the control method further comprises the step of correcting the valve:
Obtaining the inlet pipe temperature difference deltaPs_t n of the first-class indoor unit which is operated after reset, and controlling the opening degree of the first-class electronic expansion valve to increase by a first preset correction step number deltaP 1; the first preset correction step number Δp 1 is positively correlated with the inlet pipe temperature difference Δps—t n and with the indoor ambient temperature Tai n;
the inlet pipe temperature difference Δps_t n is the difference between the first coil inlet temperature Te2 n of each first-class indoor unit and the average low-pressure temperature of the system.
Wherein, the inlet pipe temperature difference Δps_t n =the inlet pipe temperature of the running internal machine-the average low-pressure temperature of the system, each inlet pipe temperature difference Δps_t n of the running internal machine is calculated, and n is the number of the internal machine. The larger the value of the inlet pipe temperature difference Δps_t n, the larger the pipe length between the inlet of the first indoor unit and the outdoor unit. Since the leakage of the electronic expansion valve for a long time results in the worst internal cooling effect of the connecting pipe, the opening degree of the electronic expansion valve of the first indoor unit is preferentially increased so that the refrigerant flows more through the indoor unit.
In addition, the first preset correction step number Δp 1 is related to the indoor environment temperature Tai n where the first indoor unit is located, in addition to the inlet pipe temperature difference Δps—t n, and when the indoor environment temperature Tai n is higher, the refrigeration load is larger, and the flow rate of the refrigerant can be increased for the first indoor unit.
The relationship between the first preset correction step number Δp 1 and the indoor environment temperature Tai n and the inlet pipe temperature difference Δps_t n is shown in the following table, the first preset correction step number Δp 1 is the step number, the indoor environment temperature Tai n is the temperature, and the inlet pipe temperature difference Δps_t n is the temperature:
ΔPs_tn＜9 9≤ΔPs_tn≤11 11＜ΔPs_tn
Tain≤30 0 4 8
Tain＞30 4 8 12
the electronic expansion valve opening of the first-class indoor unit with larger inlet pipe temperature difference deltaPs_t n and higher indoor environment temperature Tai n is increased, so that more refrigerant can flow through the electronic expansion valve, the defect that the first-class indoor unit is far away from the outdoor unit is overcome, and the operation efficiency of the multi-connected air conditioner is improved.
S250, correcting the low pressure of the external machine: obtaining an average inlet pipe temperature difference delta Ps_t, and controlling the outdoor unit to increase output so as to reduce the low-pressure temperature, wherein the step number increase of the first-class electronic expansion valve is positively correlated with the average inlet pipe temperature difference delta Ps_t; the average inlet temperature difference deltaps_t is the average difference between the average low-voltage temperature of the first indoor unit and the average low-voltage temperature of the system.
The average inlet temperature difference deltaps_t is an average value of the difference between each first indoor unit and the average low-pressure temperature of the system. When the multi-connected air conditioner has a plurality of outdoor units, the average low-pressure temperature of the system is the average temperature of the low-pressure side of the compressor of each outdoor unit. If the multi-connected air conditioner has only one outdoor unit, the average low-pressure temperature of the system is the temperature of the low-pressure side of the compressor of the outdoor unit. If the difference between the inlet pipes of all the first indoor units and the average low-pressure temperature of the system is large, it means that the connecting pipes of all the first indoor units are long, which requires that the output of the outdoor unit is increased, i.e. the low-pressure temperature is reduced. Specifically, if the output of the outdoor unit is controlled to be increased, the valve steps of the first-type electronic expansion valves of all the first-type indoor units running are required to be increased, and the increment is a second preset correction step number Δp 2.
In addition, when the capacity of all the first indoor units is larger than that of the outdoor unit, that is, when the ratio M of the total capacity of the first indoor units to the capacity of the outdoor unit is larger, the flow rate of the outdoor unit needs to be increased, so that the average low-pressure temperature of the system is reduced.
Specifically, the relationship between the second preset correction step number Δp 2 and the average inlet pipe temperature difference Δps—t and the ratio M of the total capacity of the first indoor unit to the capacity of the outdoor unit is shown in the following table. The second preset correction step number delta P 2 is in units of DEG C, and the average inlet pipe temperature difference delta Ps_t is in units of DEG C; the ratio M of the total capacity of the first indoor units to the capacity of the outdoor units is dimensionless.
ΔPs_t＜9 9≤ΔPs_t≤11 11＜ΔPs_t
M≤1 0 -1 -2
1＜M＜1.2 -1 -2 -3
1.2＜M＜1.3 -2 -3 -4
When the average pipe inlet temperature difference of all the first indoor units is larger, the opening degree of the first electronic expansion valves of all the first indoor units can be increased, so that the flow of the outdoor unit is increased, and the influence caused by the longer connecting pipes of the first indoor units and the outdoor unit is compensated.
Fig. 3 is a schematic flowchart of another control method of a multi-connected air conditioner according to an embodiment of the present invention, where the method includes:
s301, after the first indoor units of the first class continuously and stably run for a first preset time period t 1, a first measuring period t n is separated for multiple times to obtain first coil temperatures of a plurality of indoor units of the first class and the step number P n of the electronic expansion valves of the first class, and S302 is executed.
S302, judging that the variation value of the temperature of the first coil pipe in each period is larger than a first preset difference value gamma, and increasing the valve step number E (0, 10) of the first-class electronic expansion valve in each period, if so, executing S303; if not, S301 is performed.
S303, counting the number of times that the condition of S302 is continuously met, and executing S304 if n max is reached; if not, S301 is performed.
S304, after the second-class indoor units are continuously not started up for a second preset time period t 2, the second coil temperatures of the plurality of second-class indoor units and the indoor environment temperature Tai m of the space where the second-class indoor units are located are acquired for a plurality of times at intervals of the first measurement period t n, and S305 is executed.
S305, judging that the change value of the temperature of the second coil pipe in each period is larger than a second preset difference epsilon, and if so, executing S306; if not, S304 is performed.
S306, counting the number of times that the condition of S305 is continuously satisfied, and executing S307 if m max is reached; if not, executing S304;
S307, controlling the second-class electronic expansion valve to close a first preset step number, and executing S308;
S308, controlling the second-class electronic expansion valve to open a second preset step number t, closing a third preset step number S, and executing S309.
S309, obtaining the inlet pipe temperature difference deltaPs_t n of the first-class indoor unit which is operated after being reset, and controlling the opening degree of the first-class electronic expansion valve to increase by a first preset correction step number deltaP 1.
S310, obtaining the average inlet pipe temperature difference deltaPs_t, and controlling the outdoor unit to increase the output so as to reduce the low-pressure temperature.
Fig. 4 is a control apparatus of a multi-air conditioner according to an embodiment of the present invention, the control apparatus of the multi-air conditioner including:
A first obtaining module 401, configured to obtain first coil temperatures of a plurality of first-class indoor units, and a step number P n of the first-class electronic expansion valves;
A first reset module 402, configured to: the number of steps of the first-class electronic expansion valve is increased, the increasing speed of the temperature of the first coil is larger than the preset heating speed, and the second-class electronic expansion valve is controlled to reset.
According to the control device of the multi-connected air conditioner, the coil temperature of the first-class indoor unit is obtained, and based on the comparison of the temperature difference of the first measurement period t n with fixed intervals, namely the increasing speed of the first coil temperature and the preset heating speed, when the increasing speed of the first coil temperature exceeds the preset heating speed, the condition that refrigerant flows in the second-class indoor unit which is stopped besides the first-class indoor unit is indicated, but the second-class electronic expansion valve is nominally closed is indicated, so that leakage occurs due to the fact that the second-class electronic expansion valve is not tightly closed is indicated. Therefore, the second-class electronic expansion valves are reset, and the electronic expansion valves can be tightly closed, so that the control reliability is ensured, and the refrigerating effect of the first-class indoor unit is improved.
Optionally, as an embodiment, the first obtaining module 401 is specifically configured to: the first coil temperature includes a first coil inlet temperature Te2 n, a first coil outlet temperature Te1 n, and a first coil center temperature, and the rate of increase of the first coil temperature is an average of the rates of increase of the first coil inlet temperature Te2 n, the first coil outlet temperature Te1 n, and the first coil center temperature.
Optionally, as an embodiment, the first obtaining module 401 is specifically configured to: the first preset difference gamma is larger than 0 ℃ and smaller than 3 ℃, and the first measurement period t n for detecting the temperature of the first coil is 30-60 seconds; after the first indoor unit of the first type continuously and stably operates for a first preset time period t 1, n max continuous first measurement periods t n meet the condition that the increasing speed of the temperature of the first coil is larger than the preset heating speed and the valve steps of the electronic expansion valve of the first type are increased by a number E (0, 10), and then the electronic expansion valve of the second type is reset.
Optionally, as an embodiment, the control device further includes:
A second obtaining module 403, configured to: after the second-class indoor unit is continuously in a stop state and reaches a second preset time period t 2, acquiring the indoor environment temperature Tai m and the second coil temperature of the second-class indoor unit;
And a second reset module 404 for: if the difference between the second coil temperature of the second-class indoor unit and the indoor environment temperature Tai m is larger than a second preset difference epsilon, the second preset difference epsilon is larger than 1 ℃ and smaller than 3 ℃, a second measurement period t m for detecting the second coil temperature is 30-60 seconds, and the continuous m max second measurement periods t m meet the condition that the difference between the second coil temperature and the indoor environment temperature Tai m is larger than the second preset difference epsilon, resetting the second-class expansion valve.
Optionally, as an embodiment, the second service module is specifically configured to: firstly, controlling the second-class electronic expansion valve to close a first preset step number, wherein the first preset step number is the sum of the maximum step number Pmax and the preset increment step number of the electronic expansion valve; then, the second-class electronic expansion valve is controlled to be opened by a second preset step number t, the second-class electronic expansion valve is controlled to be closed by a third preset step number s, the maximum step number Pmax is larger than the third preset step number s, and the third preset step number s is larger than the second preset step number t.
Optionally, as an embodiment, the control device further includes:
The correction valve step module 405 is configured to obtain a pipe inlet temperature difference Δps_t n of the first-class indoor unit that is re-operated after being reset, and control the opening of the first-class electronic expansion valve to increase by a first preset correction step number Δp 1; the first preset correction step number Δp 1 is positively correlated with the inlet pipe temperature difference Δps—t n and with the indoor ambient temperature Tai n;
the inlet pipe temperature difference Δps_t n is the difference between the first coil inlet temperature Te2 n of each first-class indoor unit and the average low-pressure temperature of the system.
Optionally, as an embodiment, the control device further includes:
The modified outdoor unit low pressure module 406 is configured to obtain an average inlet temperature difference Δps_t, and control the outdoor unit to increase output to reduce the low pressure temperature, where the step number increase of the first type electronic expansion valve is positively related to the average inlet temperature difference Δps_t; the average inlet temperature difference deltaps_t is the average difference between the average low-voltage temperature of the first indoor unit and the average low-voltage temperature of the system.
The embodiment of the invention also provides an air conditioner which comprises a computer readable storage medium and a processor, wherein the computer readable storage medium stores a computer program, and the computer program realizes the control method when being read and run by the processor.
The embodiment of the invention also provides a computer readable storage medium, which stores a computer program, and when the computer program is read and run by a processor, the control method provided by the embodiment is realized, the same technical effect can be achieved, and the repetition is avoided, so that the description is omitted. The computer readable storage medium is, for example, a Read-Only Memory (ROM), a random access Memory (Random Access Memory RAM), a magnetic disk or an optical disk.
Of course, it will be appreciated by those skilled in the art that implementing all or part of the above-described methods in the embodiments may be implemented by a computer level to instruct a control device, where the program may be stored in a computer readable storage medium, and the program may include the above-described methods in the embodiments when executed, where the storage medium may be a memory, a magnetic disk, an optical disk, or the like.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be assessed accordingly to that of the appended claims.
Finally, it is further noted that relational terms such as first and second, and the like are 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. Moreover, 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 one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. The control device of the air conditioner and the air conditioner disclosed in the embodiments correspond to the control method of the air conditioner disclosed in the embodiments, so that the description is simpler, and the relevant parts only need to be referred to in the description of the method section.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be assessed accordingly to that of the appended claims.

Claims (8)

1. The control method of the multi-connected air conditioner comprises an outdoor unit and a plurality of indoor units, wherein the indoor units comprise a first indoor unit and a second indoor unit, the first indoor unit is the indoor unit operated during refrigeration, the second indoor unit is the indoor unit stopped during refrigeration, the first indoor unit comprises a first electronic expansion valve, and the second indoor unit comprises a second electronic expansion valve;
the control method is characterized by comprising the following steps:
acquiring the temperatures of first coils of a plurality of first-class indoor units and the step numbers of first-class electronic expansion valves; the first coil temperature comprises a first coil inlet temperature, a first coil outlet temperature and a first coil center temperature;
If the number of steps of the first-class electronic expansion valve is increased and the increasing speed of the temperature of the first coil is greater than the preset heating speed, controlling the second-class electronic expansion valve to reset; the increasing speed of the first coil temperature is the average value of the increasing speeds of the first coil inlet temperature, the first coil outlet temperature and the first coil center temperature; the first measuring period for detecting the temperature of the first coil is 30-60 seconds; after the first indoor unit of the first type continuously and stably operates for a first preset time period, continuously controlling the second electronic expansion valve to reset if n max first measurement periods meet that the increasing speed of the temperature of the first coil is larger than a preset heating speed and the valve step of the first electronic expansion valve is increased by a number E (0, 10); the preset heating speed is the ratio of a first preset difference value of each first measurement period to the duration of the first measurement period, and the first preset difference value is more than 0 ℃ and less than 3 ℃.
2. The control method of a multi-connected air conditioner according to claim 1, further comprising:
After the second-class indoor unit is continuously in a stop state for a second preset time period, acquiring the indoor environment temperature and the second coil temperature of the second-class indoor unit, and resetting the second-class expansion valve if the difference between the second coil temperature and the indoor environment temperature of the second-class indoor unit is larger than a second preset difference, the second preset difference is larger than 1 ℃ and smaller than 3 ℃, the second measurement period for detecting the second coil temperature is 30-60 seconds, and the continuous m max second measurement periods meet the condition that the difference between the second coil temperature and the indoor environment temperature is larger than the second preset difference.
3. The control method of a multi-connected air conditioner according to claim 2, wherein the controlling the second-class electronic expansion valve to be reset includes:
Firstly, controlling a second-class electronic expansion valve to close a first preset step number, wherein the first preset step number is the sum of the maximum step number and the preset increment step number of the electronic expansion valve; then, the second-class electronic expansion valve is controlled to be opened for a second preset step number, and then the second-class electronic expansion valve is controlled to be closed for a third preset step number, wherein the maximum step number is larger than the third preset step number, and the third preset step number is larger than the second preset step number.
4. The control method of a multi-connected air conditioner according to claim 1, further comprising a correction valve step of:
Obtaining the inlet pipe temperature difference of the first-class indoor unit which is operated after reset, and controlling the opening degree of the first-class electronic expansion valve to increase a first preset correction step number; the first preset correction step number is positively correlated with the inlet pipe temperature difference and is positively correlated with the indoor environment temperature;
The inlet pipe temperature difference is the difference between the inlet temperature of the first coil pipe of each first-class indoor unit and the average low-pressure temperature of the system.
5. The control method of a multi-connected air conditioner according to claim 1, further comprising correcting an external low pressure:
obtaining an average inlet pipe temperature difference, and controlling the outdoor unit to increase output so as to reduce low-pressure temperature, wherein the step number increment of the first-class electronic expansion valve is positively correlated with the average inlet pipe temperature difference; and the average inlet pipe temperature difference is the average difference value between the first indoor unit and the average low-pressure temperature of the system.
6. A control device of a multi-connected air conditioner, comprising:
the first acquisition module is used for acquiring the first coil temperatures of the plurality of first-class indoor units and the step numbers of the first-class electronic expansion valves; the first coil temperature comprises a first coil inlet temperature, a first coil outlet temperature and a first coil center temperature;
A first reset module for: if the number of steps of the first-class electronic expansion valve is increased and the increasing speed of the temperature of the first coil is greater than the preset heating speed, controlling the second-class electronic expansion valve to reset; the increasing speed of the first coil temperature is the average value of the increasing speeds of the first coil inlet temperature, the first coil outlet temperature and the first coil center temperature; the first measuring period for detecting the temperature of the first coil is 30-60 seconds; after the first indoor unit of the first type continuously and stably operates for a first preset time period, continuously controlling the second electronic expansion valve to reset if n max first measurement periods meet that the increasing speed of the temperature of the first coil is larger than a preset heating speed and the valve step of the first electronic expansion valve is increased by a number E (0, 10); the preset heating speed is the ratio of a first preset difference value of each first measurement period to the duration of the first measurement period, and the first preset difference value is more than 0 ℃ and less than 3 ℃.
7. An air conditioner comprising a computer readable storage medium storing a computer program and a processor, the computer program implementing a control method according to any one of claims 1-6 when read and run by the processor.
8. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program which, when read and run by a processor, implements the control method of any one of claims 1-6.
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