CN113108420A - Control method of air conditioner and air conditioning system - Google Patents

Control method of air conditioner and air conditioning system Download PDF

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Publication number
CN113108420A
CN113108420A CN202110342032.XA CN202110342032A CN113108420A CN 113108420 A CN113108420 A CN 113108420A CN 202110342032 A CN202110342032 A CN 202110342032A CN 113108420 A CN113108420 A CN 113108420A
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compressor
indoor unit
outdoor unit
level signal
superheat degree
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CN113108420B (en
Inventor
林立伟
易南昌
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Shenzhen Xbrother Technology Co ltd
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Shenzhen Xbrother Technology 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
    • F24F11/62—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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • 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
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • 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

Abstract

The invention discloses a control method of an air conditioner and an air conditioning system, wherein the method comprises the following steps: the method comprises the steps that an indoor unit or an outdoor unit obtains suction pressure and suction temperature of a compressor, and superheat degree of the compressor is obtained according to the suction pressure and the suction temperature; and the indoor unit or the outdoor unit adjusts the opening step number of the overheating bypass motor according to the superheat degree so as to adjust the amount of the exhaust gas of the compressor entering the double-channel heat exchanger. The invention adjusts the opening step number of the overheating bypass motor according to the superheat degree of the current air conditioner so as to adjust the amount of the exhaust gas of the compressor entering the double-channel heat exchanger, thereby realizing the degree of heat exchange of the return gas from the evaporator to the compressor in the double-channel heat exchanger, improving the heat absorption evaporation degree of the refrigerant circulating to the compressor, improving the superheat degree of the compressor and maintaining the normal refrigeration of the air conditioner.

Description

Control method of air conditioner and air conditioning system
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method of an air conditioner and an air conditioning system.
Background
In data center refrigeration, the reliability operation of air conditioning system is very important, if the compressor superheat degree is low, lead to the compressor to take liquid operation, the system will normally refrigerate, to data computer lab such as unmanned on duty, in case the air conditioner does not refrigerate, when computer lab IT equipment is more, the computer lab temperature will be out of control very fast.
Thus, there is a need for improvements and enhancements in the art.
Disclosure of Invention
The invention provides a control method of an air conditioner and an air conditioning system, and aims to solve the problem that the air conditioning system cannot normally refrigerate due to out-of-control superheat degree of a compressor in the prior art.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
in a first aspect of the present invention, a method for controlling an air conditioner is provided, where the method is applied to an air conditioning system, and the air conditioning system includes an indoor unit and an outdoor unit, where the method includes:
the method comprises the steps that an indoor unit or an outdoor unit obtains suction pressure and suction temperature of a compressor, and superheat degree of the compressor is obtained according to the suction pressure and the suction temperature;
and the indoor unit or the outdoor unit adjusts the opening step number of the overheating bypass motor according to the superheat degree so as to adjust the amount of the exhaust gas of the compressor entering the double-channel heat exchanger.
The method for controlling an air conditioner, in which the indoor unit or the outdoor unit obtains a suction pressure of the compressor, includes:
when a first low-pressure sensor arranged on the outdoor unit normally operates, the indoor unit or the outdoor unit acquires a value acquired by the first low-pressure sensor as the suction pressure of the compressor, and records the difference value between the value acquired by a second low-pressure sensor arranged on the indoor unit and the value acquired by the first low-pressure sensor in real time;
and when the first low-pressure sensor has a fault, the indoor unit or the outdoor unit acquires a numerical value acquired by the second low-pressure sensor, reads a recorded value of the difference value, and takes the difference between the numerical value acquired by the second low-pressure sensor and the recorded value of the difference value as the suction pressure of the compressor.
The control method of the air conditioner, wherein the step number of the opening of the overheating bypass motor is adjusted by the indoor unit or the outdoor unit according to the superheat degree, and the method comprises the following steps:
when the superheat degree is not less than the first preset value, setting the superheat bypass motor to be turned off;
and when the superheat degree is smaller than a second preset value, setting the superheat bypass motor to be fully opened.
Wherein the first preset value is a target superheat degree of the compressor, and the second preset value T is4＝A*TClose off，TClose offIs the first preset value, A is a preset coefficient, A<1。
The control method of the air conditioner, wherein the step number of the opening of the overheating bypass motor is adjusted by the indoor unit or the outdoor unit according to the superheat degree, and the method comprises the following steps:
when the superheat degree is smaller than the second preset value and larger than or equal to the first preset value, determining a target opening step number of the superheat degree bypass motor according to a preset range where the superheat degree is located and a second preset formula;
adjusting the starting step number of the overheating bypass motor to the target starting step number;
the second preset formula is as follows:
Figure BDA0002999439980000021
wherein the content of the first and second substances,&number of opening steps for said target, TaAs the degree of superheat, there is mentioned,&a、&brespectively a lower limit value and an upper limit value of the superheat degree, T, of a preset range in which the superheat degree is positionedm、TnAnd respectively corresponding preset reference opening step numbers to a lower limit value and an upper limit value of the superheat degree of the preset range in which the superheat degree is positioned.
The control method of the air conditioner, wherein the method further comprises:
when the communication between the indoor unit and the outdoor unit is abnormal, the indoor unit outputs a level signal to the outdoor unit according to the set temperature of the air conditioner and the average air supply temperature of the indoor unit;
and the outdoor unit controls the operation of the compressor according to the level signal output by the indoor unit.
The method for controlling the air conditioner, in which the indoor unit outputs a level signal to the outdoor unit according to a set temperature of the air conditioner and an average supply air temperature of the indoor unit, includes:
when the air conditioner is refrigerating, if the difference value obtained by subtracting the set temperature from the average air supply temperature of the indoor unit is larger than a preset value, the indoor unit outputs a first level signal, wherein the first level signal is a high level signal or a low level signal.
The control method of the air conditioner, wherein the outdoor unit controls the operation of the compressor according to the level signal output by the indoor unit, comprises the following steps:
when the level signal output by the indoor unit is the first level signal, the outdoor unit obtains the target frequency of the compressor according to the suction pressure of the compressor of the outdoor unit and a first preset formula, and adjusts the frequency of the compressor to the target frequency;
the first preset formula is as follows:
Figure BDA0002999439980000031
wherein Fo is the target frequency, Fmax is the upper limit value of the frequency of the compressor, Fmin is the lower limit value of the frequency of the compressor, Lpo is the real-time value of the suction pressure of the compressor, Lpmax is the upper limit value of the suction pressure of the compressor, and Lpmin is the lower limit value of the suction pressure of the compressor.
The control method of the air conditioner, wherein the method further comprises:
the outdoor unit outputs a level signal to the indoor unit according to the running state of the compressor;
and the indoor unit sends out corresponding prompts according to the level signals output by the outdoor unit.
The control method of the air conditioner, wherein when the compressor stops operating, the level signal output by the indoor unit is a second level signal, and the indoor unit sends out a corresponding prompt according to the level signal output by the outdoor unit, and the method comprises the following steps:
when the level signal output by the indoor unit is the first level signal, if the time length of the second level signal output by the outdoor unit reaches the preset time length, the indoor unit sends an alarm prompt.
In a second aspect of the present invention, an air conditioning system is provided, which includes an indoor unit and an outdoor unit;
the indoor unit is used for outputting a level signal to the outdoor unit according to the set temperature of the air conditioner and the average air supply temperature of the indoor unit when the communication between the indoor unit and the outdoor unit is abnormal;
and the outdoor unit is used for controlling the operation of the compressor according to the level signal output by the indoor unit.
Has the advantages that: compared with the prior art, the invention provides the air conditioner control method and the air conditioner system, the opening step number of the overheating bypass motor is adjusted according to the superheat degree of the current air conditioner, so that the quantity of the exhaust gas of the compressor entering the double-channel heat exchanger is adjusted, the degree that the return gas from the evaporator to the compressor can be subjected to heat exchange in the double-channel heat exchanger is realized, the heat absorption evaporation degree of a refrigerant circulating to the compressor is improved, the superheat degree of the compressor is improved, and the normal refrigeration of the air conditioner is maintained.
Drawings
Fig. 1 is a flowchart of an embodiment of a control method of an air conditioner according to the present invention;
fig. 2 is a schematic structural diagram of an air conditioning system according to an embodiment of a control method of an air conditioner provided by the present invention;
FIG. 3 is a logic block diagram of superheat degree control in an embodiment of a control method of an air conditioner according to the present invention;
fig. 4 is a logic block diagram of the control method of the air conditioner according to the embodiment of the present invention when the communication between the internal unit and the external unit is abnormal;
fig. 5 is a line graph showing the relationship between the frequency of the compressor and the suction pressure when the outdoor unit controls the operation of the compressor in the embodiment of the control method of the air conditioner according to the present invention;
fig. 6 is a schematic structural diagram of an embodiment of an air conditioning system according to the present invention.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example one
Referring to fig. 1, fig. 1 is a flowchart illustrating a control method of an air conditioner according to an embodiment of the present invention. The control method of the air conditioner provided by the embodiment is applied to an air conditioning system, the air conditioning system comprises an indoor unit and an outdoor unit, and the control method of the air conditioner comprises the following steps:
s100, an indoor unit or an outdoor unit acquires suction pressure and suction temperature of the compressor, and acquires superheat degree of the compressor according to the suction pressure and the suction temperature;
and S200, adjusting the opening step number of an overheating bypass motor by the indoor unit or the outdoor unit according to the superheat degree so as to adjust the amount of the exhaust gas of the compressor entering the double-channel heat exchanger.
Specifically, in this embodiment, a schematic diagram of the result of the air conditioning system is shown in fig. 2, a dual-channel heat exchanger 7 is disposed between a compressor 1 and a condenser 2 (an outdoor heat exchanger of an air conditioner), two channels are disposed in the dual-channel heat exchanger, one channel is connected to a return pipe, the other channel is connected to an exhaust pipe, during refrigeration, the return pipe from an evaporator 4 (an indoor heat exchanger of the air conditioner) is divided into two parts, one is directly connected to the compressor 1, a part of refrigerant enters the compressor 1 through the return pipe, one is connected to the return pipe channel of the dual-channel heat exchanger 7, the other part of refrigerant passes through the dual-channel heat exchanger 7 and then joins with the refrigerant in the other return pipe, and then enters the compressor 1, the refrigerant is compressed into a high-temperature and high-pressure gas state in the compressor 1 and then enters the condenser through the exhaust pipe, a direct access condenser 2, an access join with another blast pipe behind the blast pipe passageway of binary channels heat exchanger 7, binary channels heat exchanger 7 with be provided with between the compressor steam bypass step motor 8, it is difficult to see, steam bypass step motor 8 can be adjusted get into in the exhaust of compressor 1 the volume of binary channels heat exchanger 8. The exhaust pipe channel in the dual-channel heat exchanger 8 can be a rotary copper pipe, and the air return pipe channel is open, namely, the compressor return air and the compressor exhaust air from the evaporator 4 in the dual-channel heat exchanger 8 can exchange heat. When the air conditioning system runs in an indoor low return air working condition for a long time or the electronic expansion valve 3 is out of control in adjustment, the electronic expansion valve 3 cannot adjust the flow of the refrigerant matched with the air conditioning system, so that the liquid refrigerant entering the evaporator of the air conditioning system cannot fully absorb heat and evaporate, the refrigerant is not completely volatilized, the gas-liquid two-phase refrigerant is circulated back to the compressor 1, the compressor 1 is in an extremely unhealthy running state, the lubricating oil of the compressor 1 is diluted by the gas-liquid two-phase refrigerant, and the compressor motor is easy to wear after the refrigerant is in the state for a long time. The superheat degree of the compressor is a difference value between the suction temperature of the compressor and the saturated evaporation temperature corresponding to the suction pressure of the compressor, the suction temperature of the compressor is a temperature collected by an outer machine suction temperature sensor 10 in fig. 2, the suction pressure of the compressor is a pressure collected by a first low-pressure sensor 9 in fig. 2, the superheat degree of the compressor can reflect the state of a refrigerant entering the compressor at present, and it can be seen easily that the quantity of the refrigerant entering the double-channel heat exchanger 8 in the exhaust gas of the compressor 1 can be adjusted by adjusting the opening step number of the hot gas bypass stepping motor 8, so that the heat absorption evaporation degree of the refrigerant coming out of the evaporator 4 can be changed along with the change of the superheat degree, and the superheat degree is improved.
When the communication between the indoor unit and the outdoor unit is normal, the indoor unit and the outdoor unit can exchange data, so that both the indoor unit and the outdoor unit can acquire data acquired by parts arranged on the indoor unit or the outdoor unit, process the data and send the processed data to the other side, and the other side can perform corresponding control according to a processing result. The indoor unit or the outdoor unit obtains suction pressure of the compressor, and includes:
when a first low-pressure sensor arranged on the outdoor unit normally operates, the indoor unit or the outdoor unit acquires a value acquired by the first low-pressure sensor as the suction pressure of the compressor, and records the difference value between the value acquired by a second low-pressure sensor arranged on the indoor unit and the value acquired by the first low-pressure sensor in real time;
and when the first low-pressure sensor has a fault, the indoor unit or the outdoor unit acquires the numerical value acquired by the second low-pressure sensor, reads the recorded value of the difference value, and takes the sum of the numerical value acquired by the second low-pressure sensor and the recorded value of the difference value as the suction pressure of the compressor.
As shown in fig. 2, the first low pressure sensor 9 is disposed on a return air pipe of the compressor, the pressure collected by the first low pressure sensor 9 is a suction pressure of the compressor, when the first low pressure sensor 9 fails, in this embodiment, the suction pressure of the compressor is obtained by a second low pressure sensor 6 disposed on an outlet side pipeline of an evaporator of the indoor unit, since a certain pressure drop exists in a connecting pipeline between the indoor unit and the outdoor unit, the control method of the air conditioner according to this embodiment performs a pressure drop correction, specifically, when the first low pressure sensor disposed on the indoor unit normally operates, a difference between values collected by the first low pressure sensor and the second low pressure sensor is obtained and stored in real time, and when the first low pressure sensor fails, the newly stored difference value is read, and subtracting the difference value from the value acquired by the second low-pressure sensor to obtain the suction pressure of the compressor.
The step number of opening of the overheating bypass motor is adjusted by the indoor unit or the outdoor unit according to the superheat degree, and the step number adjusting method comprises the following steps:
when the superheat degree is not less than the first preset value, setting the superheat bypass motor to be turned off;
and when the superheat degree is smaller than a second preset value, setting the superheat bypass motor to be fully opened.
Wherein the first preset value is a target superheat degree of the compressor, and the second preset value T is4＝A*TClose off，TClose offIs the first preset value, A is a preset coefficient, A<1。
The target superheat of the compressor is the superheat of the compressor when the compressor is in healthy operation, the preset coefficient may be set to 0.2,0.4, and the like, and specifically, the current superheat of the compressor corresponding to the case where the superheat bypass motor needs to be fully opened in order to adjust the superheat of the compressor to the target superheat may be determined through experiments, and the preset coefficient may be further determined.
When the superheat degree is smaller than the second preset value and larger than or equal to the first preset value, determining a target opening step number of the superheat degree bypass motor according to a preset range where the superheat degree is located and a second preset formula;
adjusting the starting step number of the overheating bypass motor to the target starting step number;
the second preset formula is as follows:
Figure BDA0002999439980000071
wherein the content of the first and second substances,&number of opening steps for said target, TaAs the degree of superheat, there is mentioned,&a、&brespectively a lower limit value and an upper limit value of the superheat degree, T, of a preset range in which the superheat degree is positionedm、TnAnd respectively corresponding preset reference opening step numbers to a lower limit value and an upper limit value of the superheat degree of the preset range in which the superheat degree is positioned.
Specifically, within a range greater than or equal to the second preset value and less than the first preset value, a plurality of preset ranges may be set, and the preset reference opening step number corresponding to the upper limit value and the lower limit value of each preset range may be preset through experiments, and specifically, the number of steps that the overheated bypass motor needs to be opened under the requirement of adjusting the superheat degree of the compressor to the target superheat degree when the current superheat degree of the compressor is the upper limit value and the lower limit value of the preset range may be determined through experiments, respectively.
It should be noted that, in the present embodiment, the adjustment of the current superheat of the compressor to the target superheat is not limited to the adjustment of the current superheat of the compressor to the target superheat, but a certain float range may be set, for example, when the difference between the superheat of the compressor and the target superheat is within a certain range, the adjustment of the current superheat of the compressor to the target superheat may be considered to be performed.
An example of the preset range and the target number of opening steps of the overheated bypass motor corresponding to the preset range may be shown in the following table, where T isClose offAnd taking the target superheat degree as the target superheat degree, wherein the upper limit value and the lower limit value of the range of the opening steps of the superheat bypass motor are the preset reference opening steps corresponding to the upper limit value and the lower limit value of the corresponding preset range respectively:
Figure BDA0002999439980000081
Figure BDA0002999439980000091
the general logic diagram of the regulation of the number of opening steps of the overheated bypass motor can be shown in figure 3.
In the operation process of the air conditioning system, the superheat degree of the system is ensured through the step number adjustment of the electronic expansion valve, when refrigerant leakage occurs in a system pipeline, the processing of the refrigerant quantity of the management circulation of the air conditioning system is gradually reduced, the refrigerant quantity of the circulation in an evaporator and a condenser pipeline of the system is reduced, for the evaporator, the quantity of the circulation refrigerant is reduced, the average heat absorption quantity of the refrigerant flowing through the evaporator is increased, namely the outlet temperature of the evaporator is increased, and in order to ensure that the superheat degree of the system is controllable, the opening degree of the electronic expansion valve is gradually increased at the moment, more refrigerant quantity enters the evaporator to absorb heat, and the superheat degree is controllable, through the above control principle, the control method of the air conditioner provided by the embodiment further comprises the following steps, and the timely detection and judgment of the refrigerant leakage early warning are realized:
and if the superheat degree of the current system is larger than the target superheat degree plus the superheat degree deviation x 3, and the opening degree of the electronic expansion valve is larger than the maximum set opening degree of the electronic expansion valve 0.8, starting timing, and if the duration time exceeds the preset time t1, triggering and uploading a refrigerant leakage early warning prompt by the indoor unit or the outdoor unit so as to inform operation and maintenance personnel to perform maintenance operations such as leakage detection and refrigerant supplement on site at the first time. Specifically, the preset time period t1 may be set to 10min, 15min, or the like.
In a possible implementation manner, the judgment of the judgment condition of the refrigerant leakage prompt may be started after the compressor of the air conditioning system continuously operates for a certain time period, where the certain time period may be 5min, 8min, and the like, and may be specifically determined according to the compressor parameter of the air conditioning system.
When the air conditioning system normally operates, the superheat degree of the system is ensured through the step number adjustment of the electronic expansion valve; when the system pipeline refrigerant fills and annotates too much, the air conditioning system pipeline endless refrigerant volume will the grow, the refrigerant volume at system evaporator and condenser pipeline inner loop will increase, to the evaporimeter, endless refrigerant volume has increased, can lead to the refrigerant average heat absorption volume that flows through the evaporimeter to reduce, the export temperature of evaporimeter will reduce promptly, in order to ensure that the system superheat degree is controllable, the aperture of electronic expansion valve will progressively reduce this moment, let less refrigerant volume get into the evaporimeter and carry out the heat transfer, make the superheat degree controllable, through above control principle, the control method of the air conditioner that this embodiment provided, still include following step, realize that the refrigerant fills and annotates too much in time detection and judgement:
and if the superheat degree of the current system is less than the target superheat degree plus the superheat degree deviation x 3 and the opening degree of the electronic expansion valve is less than the maximum set opening degree of the electronic expansion valve x 1.2, timing is started, and if the duration time exceeds the preset time t2, the indoor unit or the outdoor unit triggers and uploads a prompt of excessive refrigerant filling so as to inform operation and maintenance personnel to perform maintenance operations such as partial refrigerant air return on site at the first time. Specifically, the preset time period t2 may be set to 10min, 15min, or the like.
In a possible implementation manner, the judgment of the judgment condition that the refrigerant is excessively filled may be started after the compressor of the air conditioning system continuously operates for a certain time period, where the certain time period may be 5min, 8min, and the like, and may be specifically determined according to the parameter of the compressor of the air conditioning system.
At present, the indoor unit and the outdoor unit of an air conditioning system generally adopt communication modes such as RS485 and the like for communication, when the indoor unit and the outdoor unit of the air conditioner are abnormal in communication (the communication abnormality between the indoor unit and the outdoor unit in the invention means that specific data, refrigeration and other information cannot be exchanged between the indoor unit and the outdoor unit), when the indoor unit and the outdoor unit are abnormal in communication, the outdoor unit cannot obtain related instructions of the indoor unit, in the prior art, a compressor is directly controlled to stop, the air conditioner cannot continue to refrigerate or refrigerate, for a data center with high temperature requirements, in the process that maintenance personnel arrive at the site to complete maintenance after the compressor of the air conditioner is stopped, the condition that the temperature exceeds the required range and equipment loss is caused. Based on this situation, the method for controlling an air conditioner according to this embodiment further includes:
s300, when the communication between the indoor unit and the outdoor unit is abnormal, the indoor unit outputs a level signal to the outdoor unit according to the set temperature of the air conditioner and the average air supply temperature of the indoor unit;
and S400, the outdoor unit controls the compressor to operate according to the level signal output by the indoor unit.
In the control method of the air conditioner provided in this embodiment, two trunk lines are provided between the indoor unit and the outdoor unit, and the exchange of level signals can be performed, specifically, one end of one trunk line is connected to an indoor unit DO port (output port), one end of the trunk line is connected to an outdoor unit DI port (input port), one end of the other trunk line is connected to an indoor unit DI port (input port), and one end of the other trunk line is connected to an outdoor unit DO port (output port). As shown in fig. 4, when the communication between the indoor unit and the outdoor unit is abnormal, the power supply contactor of the outdoor unit is kept closed, the indoor unit outputs a corresponding level signal to the outdoor unit from the DO port of the indoor unit according to the set temperature of the air conditioner and the average air supply temperature of the indoor unit, where the level signal includes a high level signal and a low level signal.
Specifically, whether the compressor needs to operate or not can be determined by the set temperature of the air conditioner and the average air supply temperature of the indoor unit, and the set temperature of the air conditioner and the average air supply temperature of the indoor unit are collected at the indoor side and are not required to be collected by the outdoor unit and then sent to the indoor unit. In a possible implementation manner, when the set temperature of the air conditioner is not consistent with the average air supply temperature of the indoor unit (when the air conditioning system is cooling, the set temperature of the air conditioner is lower than the average air supply temperature of the indoor unit, or when the air conditioning system is heating, the set temperature of the air conditioner is higher than the average air supply temperature of the indoor unit), the first level signal (which may be a high level signal or a low level signal) indicating that the compressor needs to operate is output, and when the set temperature of the air conditioner is consistent with the average air supply temperature of the indoor unit, the third level signal identifying that the compressor needs to operate is output, where the third level signal is different from the first level signal, that is, one is a high level signal and the other is a low level signal. In another possible implementation manner, in order to reduce energy consumption of an air conditioner, when a difference between a set temperature of the air conditioner and an average supply air temperature of the indoor unit exceeds a certain range, the indoor unit outputs the first level signal indicating that a compressor needs to operate, that is, the indoor unit outputs a level signal to the outdoor unit according to the set temperature of the air conditioner and the average supply air temperature of the indoor unit, including:
when the air conditioner is refrigerating, if the difference value obtained by subtracting the set temperature from the average air supply temperature of the indoor unit is larger than a preset value, the indoor unit outputs the first level signal, and if the difference value obtained by subtracting the set temperature from the average air supply temperature of the indoor unit is smaller than the preset value, the indoor unit outputs the third level signal.
Similarly, it can be understood that, when the air conditioner is heating, if the average supply air temperature of the indoor unit subtracted from the set temperature is greater than a preset value, the indoor unit outputs the first level signal, and if the average supply air temperature of the indoor unit subtracted from the set temperature is less than a preset value, the indoor unit outputs the third level signal.
The outdoor unit controls the operation of the compressor according to the level signal output by the indoor unit, and the method comprises the following steps:
when the level signal output by the indoor unit is the first level signal, the outdoor unit obtains the target frequency of the compressor according to the suction pressure of the compressor of the outdoor unit and a first preset formula, and adjusts the frequency of the compressor to the target frequency.
When the outdoor unit reads that the first level signal is input to the input end of the main joint line, the outdoor unit controls the compressor of the air conditioner to operate, specifically, the suction pressure of the compressor of the outdoor unit can be acquired through a low-pressure sensor arranged on the outdoor unit, and the low-pressure sensor arranged on the outdoor unit is installed on a main suction pipeline of the compressor.
Specifically, the first preset formula is as follows:
Figure BDA0002999439980000121
wherein Fo is the target frequency, Fmax is the upper limit value of the frequency of the compressor, Fmin is the lower limit value of the frequency of the compressor, Lpo is the real-time value of the suction pressure of the compressor, Lpmax is the upper limit value of the suction pressure of the compressor, and Lpmin is the lower limit value of the suction pressure of the compressor. The relationship curve between the target frequency and the compressor suction pressure corresponding to the first preset formula is shown in fig. 5.
The control method of the air conditioner provided by the embodiment further comprises the following steps:
the outdoor unit outputs a level signal to the indoor unit according to the running state of the compressor;
and the indoor unit sends out corresponding prompts according to the level signals output by the outdoor unit.
Specifically, the outdoor unit outputs a corresponding level signal according to whether the compressor is running, when the compressor stops running, the outdoor unit outputs a second level signal, which may be a high level signal or a low level signal, and when the compressor is running, the outdoor unit outputs a fourth level signal, which is opposite to the second level signal, that is, one is a high level signal and the other is a low level signal. The indoor set sends corresponding suggestion according to the level signal of off-premises station output, includes:
when the level signal output by the indoor unit is the first level signal, if the time length of the second level signal output by the outdoor unit reaches the preset time length, the indoor unit sends an alarm prompt.
Specifically, when the level signal output by the indoor unit is the first level signal, it is indicated that the compressor needs to operate, at this time, if the outdoor unit outputs the fourth level signal, it is indicated that the compressor normally operates, if the outdoor unit outputs the second level signal, it is indicated that the compressor is not started to operate as required, when the duration of the second level signal output by the outdoor unit reaches a preset duration (e.g., 5min, 6min, etc.), it is indicated that the compressor cannot normally operate, and the indoor unit sends an alarm prompt.
Further, as shown in fig. 4, when an outdoor unit low pressure sensor of the outdoor unit fails, that is, the suction pressure of the compressor cannot be obtained, the outdoor unit may control the compressor to operate at a fixed frequency (e.g., 70 Hz). When the controller of the outdoor unit and the compressor variable frequency driver are abnormal, the compressor can be controlled by the control box controller to keep running at a fixed frequency (such as 70 Hz). When the level signal transmission of the indoor unit and the outdoor unit fails, the on-off of the power supply contactor of the outdoor unit can be controlled through the control box to realize the start-stop of the compressor.
For unattended data machine rooms and other data machine rooms, once the air conditioner does not refrigerate, if the number of IT equipment in the machine room is large, the temperature of the machine room is out of control quickly. As can be seen from the above description, the control method of the air conditioner provided in this embodiment can keep the operation of the compressor of the air conditioner when the communication between the indoor unit and the outdoor unit of the air conditioner is abnormal, so as to ensure the sustainability of the refrigeration or heating of the air conditioning system, provide sufficient guarantee time for the maintainers to arrive at the site, and have high reliability.
In summary, the present invention provides a control method for an air conditioner, which adjusts the number of opening steps of an overheat bypass motor according to the superheat degree of the current air conditioner, so as to adjust the amount of air entering a dual-channel heat exchanger in the exhaust gas of a compressor, thereby achieving the degree that the return air from an evaporator to the compressor can be heat exchanged in the dual-channel heat exchanger, improving the heat absorption evaporation degree of a refrigerant circulating to the compressor, improving the superheat degree of the compressor, and maintaining the normal refrigeration of the air conditioner.
It should be understood that, although the steps in the flowcharts shown in the figures of the present specification are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps in the description are not to be performed in the exact order recited, unless explicitly stated, and may be performed in other orders. Moreover, at least a portion of the steps in the specification may include multiple sub-steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of performing the sub-steps or stages is not necessarily sequential, but may be performed alternately or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, databases, or other media used in embodiments provided herein may include non-volatile and/or volatile memory. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
Example two
Based on the foregoing embodiments, the present invention further provides an air conditioning system, whose structural principle can be shown in fig. 6, where the air conditioning system includes an indoor unit and an outdoor unit, and the indoor unit or the outdoor unit is configured to:
acquiring the suction pressure and the suction temperature of the compressor, and acquiring the superheat degree of the compressor according to the suction pressure and the suction temperature, wherein the superheat degree is specifically as described in the first embodiment;
adjusting the opening step number of an overheating bypass motor according to the superheat degree so as to adjust the amount of the exhaust gas of the compressor entering the double-channel heat exchanger; the details are as described in embodiment one.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. A control method of an air conditioner is applied to an air conditioning system, the air conditioning system comprises an indoor unit and an outdoor unit, and the method is characterized by comprising the following steps:
the method comprises the steps that an indoor unit or an outdoor unit obtains suction pressure and suction temperature of a compressor, and superheat degree of the compressor is obtained according to the suction pressure and the suction temperature;
and the indoor unit or the outdoor unit adjusts the opening step number of the overheating bypass motor according to the superheat degree so as to adjust the amount of the exhaust gas of the compressor entering the double-channel heat exchanger.
2. The method of claim 1, wherein the step of obtaining the suction pressure of the compressor by the indoor unit or the outdoor unit comprises:
when a first low-pressure sensor arranged on the outdoor unit normally operates, the indoor unit or the outdoor unit acquires a value acquired by the first low-pressure sensor as the suction pressure of the compressor, and records the difference value between the value acquired by a second low-pressure sensor arranged on the indoor unit and the value acquired by the first low-pressure sensor in real time;
and when the first low-pressure sensor has a fault, the indoor unit or the outdoor unit acquires a numerical value acquired by the second low-pressure sensor, reads a recorded value of the difference value, and takes the difference between the numerical value acquired by the second low-pressure sensor and the recorded value of the difference value as the suction pressure of the compressor.
3. The method of claim 1, wherein the adjusting the number of the opening steps of the overheated bypass motor according to the degree of superheat of the indoor unit or the outdoor unit comprises:
when the superheat degree is not less than the first preset value, setting the superheat bypass motor to be turned off;
and when the superheat degree is smaller than a second preset value, setting the superheat bypass motor to be fully opened.
Wherein the first preset value is a target superheat degree of the compressor, and the second preset value T is4＝A*TClose off，TClose offIs the first preset value, A is a preset coefficient, A<1。
4. The method of claim 3, wherein the adjusting the number of the opening steps of the overheated bypass motor according to the degree of superheat, comprises:
when the superheat degree is smaller than the second preset value and larger than or equal to the first preset value, determining a target opening step number of the superheat degree bypass motor according to a preset range where the superheat degree is located and a second preset formula;
adjusting the starting step number of the overheating bypass motor to the target starting step number;
the second preset formula is as follows:
Figure FDA0002999439970000021
wherein the content of the first and second substances,&number of opening steps for said target, TaAs the degree of superheat, there is mentioned,&a、&brespectively a lower limit value and an upper limit value of the superheat degree, T, of a preset range in which the superheat degree is positionedm、TnAnd respectively corresponding preset reference opening step numbers to a lower limit value and an upper limit value of the superheat degree of the preset range in which the superheat degree is positioned.
5. The control method of an air conditioner according to any one of claims 1 to 4, characterized by further comprising:
when the communication between the indoor unit and the outdoor unit is abnormal, the indoor unit outputs a level signal to the outdoor unit according to the set temperature of the air conditioner and the average air supply temperature of the indoor unit;
and the outdoor unit controls the operation of the compressor according to the level signal output by the indoor unit.
6. The method of claim 5, wherein the outputting of the level signal from the indoor unit to the outdoor unit according to the set temperature of the air conditioner and the average supply air temperature of the indoor unit comprises:
when the air conditioner is refrigerating, if the difference value obtained by subtracting the set temperature from the average air supply temperature of the indoor unit is larger than a preset value, the indoor unit outputs a first level signal, wherein the first level signal is a high level signal or a low level signal.
7. The method of claim 6, wherein the controlling the compressor of the outdoor unit according to the level signal outputted from the indoor unit comprises:
when the level signal output by the indoor unit is the first level signal, the outdoor unit obtains the target frequency of the compressor according to the suction pressure of the compressor of the outdoor unit and a first preset formula, and adjusts the frequency of the compressor to the target frequency;
the first preset formula is as follows:
Figure FDA0002999439970000031
wherein Fo is the target frequency, Fmax is the upper limit value of the frequency of the compressor, Fmin is the lower limit value of the frequency of the compressor, Lpo is the real-time value of the suction pressure of the compressor, Lpmax is the upper limit value of the suction pressure of the compressor, and Lpmin is the lower limit value of the suction pressure of the compressor.
8. The control method of an air conditioner according to claim 6, further comprising:
the outdoor unit outputs a level signal to the indoor unit according to the running state of the compressor;
and the indoor unit sends out corresponding prompts according to the level signals output by the outdoor unit.
9. The method of claim 8, wherein when the compressor stops operating, the level signal output by the indoor unit is a second level signal, and the indoor unit issues a corresponding prompt according to the level signal output by the outdoor unit, comprising:
when the level signal output by the indoor unit is the first level signal, if the time length of the second level signal output by the outdoor unit reaches the preset time length, the indoor unit sends an alarm prompt.
10. An air conditioning system is characterized by comprising an indoor unit and an outdoor unit; the indoor unit or the outdoor unit is configured to:
acquiring suction pressure and suction temperature of the compressor, and acquiring superheat degree of the compressor according to the suction pressure and the suction temperature;
and adjusting the opening step number of the overheating bypass motor according to the superheat degree so as to adjust the amount of the exhaust gas of the compressor entering the double-channel heat exchanger.
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