CN111750486B - Control method and device for preventing indoor unit from freezing and air conditioner - Google Patents
Control method and device for preventing indoor unit from freezing and air conditioner Download PDFInfo
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- CN111750486B CN111750486B CN202010555109.7A CN202010555109A CN111750486B CN 111750486 B CN111750486 B CN 111750486B CN 202010555109 A CN202010555109 A CN 202010555109A CN 111750486 B CN111750486 B CN 111750486B
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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
- F24F11/41—Defrosting; Preventing freezing
- F24F11/43—Defrosting; Preventing freezing of indoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
- F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—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
- F24F11/873—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling refrigerant heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention provides an indoor unit freezing prevention control method, an indoor unit freezing prevention control device and an air conditioner, wherein the method comprises the following steps: under a refrigeration mode, acquiring the temperature of an indoor coil in real time; judging whether the evaporator meets the defrosting protection condition or not according to the temperature of the indoor coil; and if the evaporator meets the defrosting protection condition, opening an electromagnetic valve and electric heating, wherein the electromagnetic valve and the electric heating are arranged on a bypass pipeline for communicating a refrigerant inlet and a refrigerant outlet of the indoor unit. Therefore, when the anti-freezing operation is needed, the refrigerant inlet and the refrigerant outlet of the indoor unit are bypassed, and electric heating is carried out, so that the adverse consequences that the service life is shortened and the normal refrigeration experience of a client is influenced due to frequent starting and stopping of the compressor caused by closing the compressor and the outer fan are avoided.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an indoor unit freezing prevention control method and device and an air conditioner.
Background
In the existing air conditioner, when a unit of the existing air conditioner runs in a low-temperature environment or under the condition that an indoor unit is dirty and blocked for a long time, an evaporator of the indoor unit is easy to frost, and potential safety hazards are brought.
In order to solve the problem, a common method is to arrange a coil temperature sensing bulb on the evaporator, so that in the case that the evaporator is about to frost or has frosted, the compressor and the external fan are turned off to defrost; however, the method for defrosting the evaporator needs to start and stop the compressor, so that the service life of the compressor is easily shortened, and normal refrigeration is interrupted and interrupted, so that the customer experience is influenced.
There is therefore a need for a method of freeze control for evaporators that does not require shutting down the compressor and external fan.
Disclosure of Invention
The invention solves the problem that the conventional anti-freezing control needs frequent starting and stopping of the compressor, thereby influencing normal use.
In order to solve the above problems, the present invention firstly provides an internal unit freezing prevention control method, which includes:
under a refrigeration mode, acquiring the temperature of an indoor coil in real time;
judging whether the evaporator meets the defrosting protection condition or not according to the temperature of the indoor coil pipe;
and if the evaporator meets the defrosting protection condition, opening an electromagnetic valve and electric heating, wherein the electromagnetic valve and the electric heating are arranged on a bypass pipeline for communicating a refrigerant inlet and a refrigerant outlet of the indoor unit.
Therefore, when the anti-freezing operation is needed, the refrigerant inlet and the refrigerant outlet of the indoor unit are bypassed, and electric heating is carried out, so that the adverse consequences that the service life is shortened and the normal refrigeration experience of a client is influenced due to frequent starting and stopping of the compressor caused by closing the compressor and the outer fan are avoided.
Optionally, when the following conditions are met, determining that the evaporator meets the defrosting protection condition:
the indoor coil temperatures are all less than a second temperature threshold for a first duration.
Like this, through first time long, can make the scope of falling into of indoor coil pipe temperature more embody its actual conditions, avoided because the misoperation condition that the measuring value of indoor coil pipe temperature changes suddenly and cause, improved the degree of accuracy of control.
Optionally, the continuous time of the first duration includes the current time.
Therefore, the judgment on the temperature of the indoor coil pipe can be the latest judgment at the current moment, so that the corresponding anti-freezing operation can be performed in time according to the judgment result, the situation that different judgment results appear in the state of the temperature of the indoor coil pipe can be avoided, and the accuracy of judgment and control is further improved.
Optionally, after determining whether the evaporator meets the defrosting protection condition according to the temperature of the indoor coil, the method further includes:
if the evaporator does not meet the defrosting protection condition, the electromagnetic valve and the electric heating are closed after the indoor coil temperature is greater than or equal to a first temperature threshold value in the first time period, and the first temperature threshold value is greater than a second temperature threshold value.
Therefore, after the freezing risk is eliminated, the normal operation of the indoor unit of the air conditioner is timely recovered, the refrigeration working state is timely recovered, and the like, and the user experience feeling and the comfort level are improved.
Optionally, after determining whether the evaporator meets the defrosting protection condition according to the temperature of the indoor coil, the method further includes:
if the evaporator does not meet the defrosting protection condition, controlling the electromagnetic valve and the electric heater to be kept closed after the indoor coil temperature is smaller than a first temperature threshold value and larger than or equal to a second temperature threshold value within the first time period, and adjusting the inner fan to be the highest wind level.
By improving the wind shield, on one hand, the evaporating temperature of the refrigerant can be improved, the purpose of preventing the indoor unit from freezing is achieved, and on the other hand, the refrigerating effect of the indoor unit cannot be reduced.
Optionally, if the evaporator meets the defrosting protection condition, opening a solenoid valve and electrically heating, including:
after the temperature of the indoor coil pipe is smaller than the second temperature threshold value and larger than or equal to a third temperature threshold value within the first time period, the electric heating is started, and the electromagnetic valve is opened to a first preset opening degree;
and after the temperature of the indoor coil pipe is smaller than the third temperature threshold value and larger than or equal to a fourth temperature threshold value within the first time period, opening the electric heater and opening the electromagnetic valve to a second preset opening degree.
By setting the third temperature threshold value, the temperature ranges of the second temperature threshold value and the fourth temperature threshold value are divided into two parts, so that the freezing prevention of the indoor unit is guaranteed, the amount of refrigerant flowing into the indoor unit is maintained as much as possible, and the heat exchange effect of the indoor unit is guaranteed.
Optionally, if the evaporator meets the defrosting protection condition, opening an electromagnetic valve and electrically heating, further comprising:
and after the temperature of the indoor coil pipe is smaller than the fourth temperature threshold value within the first time period, opening the electric heater and opening the electromagnetic valve to a third preset opening degree.
Therefore, the freezing prevention operation is performed on the indoor unit with the freezing risk by setting the third preset opening degree, the opening degree of the electromagnetic valve is further increased, and the refrigerant flowing into the indoor unit is reduced. Through temperature interval division, according to the change of inner coil pipe temperature, determine its regulative mode and regulation degree, when guaranteeing its heat transfer effect, make anti-freezing adjustment more accurate.
Optionally, in the cooling mode, after obtaining the temperature of the indoor coil in real time, the method further includes:
and after a shutdown instruction is received, controlling the electromagnetic valve and the electric heater to be kept closed, and executing the shutdown instruction.
Therefore, the shutdown instruction is executed after the electromagnetic valve and the electric heating are confirmed to be kept closed, and the adverse effect of the conduction of the bypass pipeline on the starting of the air conditioner during the subsequent starting can be avoided.
Secondly provide an anti-internal unit and freeze controlling means, it includes:
the acquisition unit is used for acquiring the temperature of the indoor coil in real time in a refrigeration mode;
the judging unit is used for judging whether the evaporator meets the defrosting protection condition or not according to the temperature of the indoor coil;
and the control unit is used for opening an electromagnetic valve and electric heating if the evaporator meets the defrosting protection condition, and the electromagnetic valve and the electric heating are arranged on a bypass pipeline for communicating a refrigerant inlet and a refrigerant outlet of the indoor unit.
Therefore, when the anti-freezing operation is needed, the refrigerant inlet and the refrigerant outlet of the indoor unit are bypassed, and electric heating is carried out, so that the adverse consequences that the service life is shortened and the normal refrigeration experience of a client is influenced due to frequent starting and stopping of the compressor caused by closing the compressor and the outer fan are avoided.
The air conditioner comprises a computer readable storage medium and a processor, wherein the computer readable storage medium stores a computer program, and the computer program is read by the processor and runs to realize the indoor unit freezing prevention control method.
Therefore, when the anti-freezing operation is needed, the refrigerant inlet and the refrigerant outlet of the indoor unit are bypassed, and the electric heating is carried out, so that the adverse effects that the service life is shortened and the normal refrigeration experience of a client is influenced due to frequent starting and stopping of the compressor caused by closing the compressor and the external fan are avoided.
Finally, a computer-readable storage medium is characterized in that the computer-readable storage medium stores a computer program, and when the computer program is read and executed by a processor, the computer program implements the internal machine freezing prevention control method.
Therefore, when the anti-freezing operation is needed, the refrigerant inlet and the refrigerant outlet of the indoor unit are bypassed, and electric heating is carried out, so that the adverse consequences that the service life is shortened and the normal refrigeration experience of a client is influenced due to frequent starting and stopping of the compressor caused by closing the compressor and the outer fan are avoided.
Drawings
Fig. 1 is a flowchart of an internal machine freeze prevention control method according to an embodiment of the present invention;
fig. 2 is a flowchart of an internal machine freeze prevention control method according to another embodiment of the present invention;
fig. 3 is a flowchart of an internal machine freeze prevention control method according to still another embodiment of the present invention;
fig. 4 is a flowchart of the steps 300 of the anti-indoor unit freezing control method according to an embodiment of the present invention;
fig. 5 is a flowchart of the steps 300 of an anti-indoor unit freezing control method according to another embodiment of the present invention;
fig. 6 is a flowchart of an indoor unit freezing prevention control method according to still another embodiment of the present invention;
fig. 7 is a block diagram of the structure of the indoor unit freezing prevention control device according to the embodiment of the present invention.
Description of reference numerals:
1-an acquisition unit, 2-a judgment unit and 3-a control unit.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
For easy understanding, in the present invention, technical problems therein need to be elaborated.
In the existing air conditioner, when a unit of the existing air conditioner runs in a low-temperature environment or under the condition that an indoor unit is dirty and blocked for a long time, an evaporator of the indoor unit is easy to frost, and potential safety hazards are brought. The evaporator frosting and the risk of frosting are only what happens when the air conditioner is operated in a cooling mode and a dehumidification mode similar to the cooling mode.
In order to solve this problem, a common method is to provide a coil thermal bulb on the evaporator, so that in the case that the evaporator is about to frost (freeze) or has frosted, the refrigeration mode or the dehumidification mode is stopped by the compressor and the outer fan (the inner fan is also controlled to operate according to a set wind gear), so as to heat the evaporator, and prevent the evaporator from freezing.
However, in the anti-freezing method, the compressor and the external fan need to be turned off, and the compressor needs to be started and stopped every time; the frequent start-stop of compressor can shorten the life of compressor on the one hand, and on the other hand, the compressor starts at every turn or all need can stop or open after stopping after a period of guard time, consequently can lead to the refrigeration effect of indoor machine side to be intermittent and intermittent, brings very poor experience to customer's refrigeration.
In the field of air conditioners, the names of the heat exchangers of the indoor unit and the outdoor unit are divided into two cases, one is named according to different installation positions, namely, the heat exchanger on the indoor unit side is called as an evaporator, and the heat exchanger on the outdoor unit side is called as a condenser; one is named according to the function of the heat exchanger, that is, the heat exchanger functioning to evaporate and absorb heat (for an internal refrigerant) is called an evaporator, and the heat exchanger functioning to condense and discharge heat (for an internal refrigerant) is called a condenser.
In this application, to prevent confusion, the condenser refers to a heat exchanger provided on the outdoor unit side, and the evaporator refers to a heat exchanger provided on the indoor unit side.
The embodiment of the disclosure provides an indoor unit freezing prevention control method, which can be executed by an indoor unit freezing prevention control device, and the indoor unit freezing prevention control device can be integrated in electronic equipment such as an air conditioner, an air conditioner control device and the like. Fig. 1 is a flowchart of an indoor unit freezing prevention control method according to an embodiment of the present invention; the control method for preventing the internal machine from freezing comprises the following steps:
the temperature of the indoor coil pipe is the temperature of the coil pipe in the indoor unit, and can be obtained through a coil pipe temperature sensing bulb arranged on the evaporator, or can be directly or indirectly obtained through other modes.
It should be noted that the indoor coil temperature is obtained in real time, and the latest indoor coil temperature is the indoor coil temperature obtained at the present time.
the frost protection condition is met, which means that the temperature of the indoor coil is too low, the evaporator and the indoor unit are about to freeze or frost is frozen, and a frost prevention operation needs to be performed.
And 300, if the evaporator meets the defrosting protection condition, opening an electromagnetic valve and electric heating, wherein the electromagnetic valve and the electric heating are arranged on a bypass pipeline for communicating a refrigerant inlet and a refrigerant outlet of the indoor unit.
Therefore, after the electromagnetic valve is opened, a part of low-temperature refrigerant flowing into the indoor unit is led into the bypass pipeline, the flow of the refrigerant entering the indoor unit is reduced, the heat exchange quantity of each unit of the refrigerant entering the indoor unit is increased, the evaporation temperature of the refrigerant is increased, and the purpose of preventing the freezing of the indoor unit (evaporator) is achieved.
In addition, the low-temperature refrigerant which does not flow into the indoor unit on the bypass pipeline is heated through electric heating, so that the low-temperature refrigerant absorbs heat and evaporates, and the pressure of the whole air conditioning system is maintained to be normal.
Therefore, when the anti-freezing operation is needed, the refrigerant inlet and the refrigerant outlet of the indoor unit are bypassed, and the electric heating is carried out, so that the adverse effects that the service life is shortened and the normal refrigeration experience of a client is influenced due to frequent starting and stopping of the compressor caused by closing the compressor and the external fan are avoided.
In addition, a bypass pipeline can be arranged between the outlet of the condenser and the inlet of the evaporator to communicate the outlet of the condenser and the inlet of the evaporator to perform anti-freezing operation, but compared with the technical scheme of the application, on one hand, the refrigerant at the outlet of the condenser directly bypasses the inlet of the evaporator, and the refrigerant directly enters the evaporator due to the high temperature of the refrigerant of the condenser, so that the indoor effect can be influenced; on the other hand, the refrigerant at the outlet of the condenser is not throttled and decompressed, and the high-pressure refrigerant directly enters the evaporator, so that the impact noise of the refrigerant can be caused.
Optionally, when the following conditions are met, determining that the evaporator meets the defrosting protection condition:
the indoor coil temperatures are all less than a second temperature threshold for a first duration.
Like this, through first time long, can make the scope of falling into of indoor coil pipe temperature more embody its actual conditions, avoided because the misoperation condition that the measuring value of indoor coil pipe temperature changes suddenly and cause, improved the degree of accuracy of control.
Optionally, the value range of the second temperature threshold is 4-5 ℃. Preferably 5 deg.c. Therefore, the temperature range obviously lower than the temperature of the pipe at the normal running time is divided, and the corresponding anti-freezing operation is conveniently executed.
Optionally, the value range of the first duration is 5s to 13 s. Through the first time, the judgment of the indoor coil temperature can be converted into the judgment in a stable state, so that adverse consequences such as frequent switching of anti-freezing operation and the like caused by fluctuation of the indoor coil temperature are avoided.
Optionally, the first duration is 10 s. Therefore, the temperature of the indoor coil pipe in a stable state can be rapidly judged, and the accuracy of judgment and follow-up control is improved.
Optionally, the continuous time of the first duration includes the current time. That is, the first time period is actually a time period that is traced back from the current time to the front by the first time period. Therefore, the judgment on the indoor coil temperature is the latest judgment at the current moment, so that the corresponding anti-freezing operation can be performed in time according to the judgment result, the condition that different judgment results appear in the indoor coil temperature state can be avoided (for example, the judgment before one minute meets the frosting protection condition, the judgment before two minutes does not meet the frosting protection condition, only the judgment result containing the first time length at the current moment is reserved after the improvement), and the judgment and control accuracy is further improved.
Optionally, as shown in fig. 2, after the step 200 of judging whether the evaporator meets the defrosting protection condition according to the indoor coil temperature, the method further includes:
Wherein, the temperature is larger than or equal to the first temperature threshold value, which means that the temperature of the indoor coil pipe is close to the normal operation temperature, and the freezing risk of the indoor unit is eliminated.
It should be noted that, after the electromagnetic valve is closed and the electric heating is performed, the indoor unit can be recovered to the set mode before the anti-freezing operation is performed to operate, so that the normal working state of the air conditioner is recovered as soon as possible, and the user experience is improved.
Therefore, after the freezing risk is eliminated, the normal operation of the indoor unit of the air conditioner is timely recovered, the refrigeration working state is timely recovered, and the like, and the user experience feeling and the comfort level are improved.
Optionally, the value range of the first temperature threshold is 8 ℃ to 10 ℃, and is preferably 8 ℃. Therefore, the normal operation temperature and the freezing risk temperature of the indoor coil pipe can be divided, the accuracy of the anti-freezing control of the indoor unit is improved, and the adjustment is more accurate.
Optionally, as shown in fig. 3, after the step 200 of judging whether the evaporator meets the defrosting protection condition according to the indoor coil temperature, the method further includes:
The inner fan wind shield is adjusted to be the highest wind shield, the inner fan wind shield is increased, the inner side air quantity is increased, and the inner side heat exchange is increased, so that the heat exchange quantity of the inner side refrigerant is improved, the evaporation temperature of the refrigerant is improved, and the purpose of preventing the inner machine (evaporator) from freezing is achieved.
It should be noted that the electromagnetic valve and the electric heater are controlled to be kept closed, that is, if the electromagnetic valve and the electric heater are in a closed state, no treatment is performed, and if the electromagnetic valve and the electric heater are in an open state, the electromagnetic valve and the electric heater are closed.
It should be noted that, when the inner fan is adjusted to the highest wind level, if the inner fan is already at the highest wind level, the inner fan needs to be continuously maintained at the highest wind level.
The temperature of the indoor coil is smaller than the first temperature threshold and larger than or equal to the second temperature threshold, which means that the temperature of the indoor coil has a freezing risk, but the freezing risk is very small, and intense anti-freezing control is not required (the anti-freezing operation of the opening of the bypass pipeline electromagnetic valve can reduce the refrigerating capacity of the indoor unit, and affect normal refrigeration and customer experience); through improving the wind shelves, can improve the evaporating temperature of refrigerant on the one hand, reach the purpose that prevents the interior machine and freeze, on the other hand still can not reduce the refrigeration effect of indoor set (the interior fan wind shelves increase can increase the refrigeration effect of interior machine on the contrary).
Optionally, as shown in fig. 4, the step 300, if the evaporator meets the defrost protection condition, opening a solenoid valve and electrically heating, includes:
and 320, after the temperatures of the indoor coils are all smaller than the third temperature threshold value and larger than or equal to a fourth temperature threshold value within the first time period, opening the electric heater and opening the electromagnetic valve to a second preset opening degree.
Wherein the first preset opening degree is smaller than the second preset opening degree. Therefore, different preset opening degrees are set, the anti-freezing operation of the internal machine is carried out through the different preset opening degrees, and the adjusting accuracy is improved.
Optionally, the fourth temperature threshold is 0 ℃. Therefore, the temperature range of the indoor coil pipe with the freezing risk is divided into a risk range to be frozen and a risk range which is frozen, so that different indoor unit freezing prevention operations can be conveniently adopted, and accurate control is performed.
The temperature range of the second temperature threshold and the temperature range of the fourth temperature threshold are divided into two parts by setting the third temperature threshold, so that the freezing prevention of the inner machine is ensured, the refrigerant amount flowing into the inner machine is maintained as much as possible, and the heat exchange effect of the inner machine is ensured.
Optionally, the value range of the third temperature threshold is 2 ℃ to 3 ℃. Preferably 3 deg.c. Thereby being convenient for mark off different indoor coil pipe temperature ranges to improve the regulation precision.
Optionally, as shown in fig. 5, the step 300, if the evaporator meets the defrost protection condition, opening a solenoid valve and electrically heating, further includes:
and 330, after the temperatures of the indoor coils are all smaller than the fourth temperature threshold value within the first time period, opening the electric heater and opening the electromagnetic valve to a third preset opening degree.
And the third preset opening degree is greater than the second preset opening degree.
Optionally, the third preset opening is a maximum opening within an operation range of the electromagnetic valve.
The operation range of the electromagnetic valve is determined by the fixed parameters of the electromagnetic valve and all the operation parameters of the internal machine.
Therefore, the freezing prevention operation is performed on the indoor unit with the freezing risk by setting the third preset opening degree, the opening degree of the electromagnetic valve is further increased, and the refrigerant flowing into the indoor unit is reduced. Through the interval division of temperature, according to the change of interior coil pipe temperature, determine its regulative mode and regulation degree, when guaranteeing its heat transfer effect, make to prevent frostbite to adjust more accurately.
In combination with step 320, the second preset opening degree and the third preset opening degree are set to be opened at the same time, so that the anti-freezing operation of the internal machine is performed through more different preset opening degrees, and the adjustment accuracy is further improved.
Optionally, as shown in fig. 6, in the step 100, after acquiring the temperature of the indoor coil in real time in the cooling mode, the method further includes:
and step 600, after a shutdown instruction is received, controlling the electromagnetic valve and the electric heater to be kept closed, and executing the shutdown instruction.
It should be noted that, the controlling of the solenoid valve and the electric heating to be kept closed means that if the solenoid valve and the electric heating are in the closed state, the solenoid valve and the electric heating are not processed, and if the solenoid valve and the electric heating are in the open state, the solenoid valve and the electric heating are closed.
Therefore, the shutdown instruction is executed after the electromagnetic valve and the electric heating are confirmed to be kept closed, and the adverse effect of the conduction of the bypass pipeline on the starting of the air conditioner during the subsequent starting can be avoided.
It should be noted that, in the present application, the anti-internal-machine freezing operations in steps 310, 320, 330, 400, and 500 may be mutually converted in pairs; the indoor coil temperature is obtained and judged in real time, once the indoor coil temperature meets the switching conditions of the step 310, the step 320 and the step 330 and the step 400 and the step 500, the indoor unit freezing prevention operation of the step is executed in time; the above-described anti-internal-machine-freezing operation need not be performed in a fixed order.
In the application, the temperature of the refrigerant after heat exchange of the inner machine is improved by improving the wind gear of the inner machine; a large amount of refrigerants are prevented from flowing into an inner machine evaporator through a bypass pipeline, so that the heat exchange quantity of each unit of refrigerant of an inner machine is increased, and the evaporation temperature of the inner machine is increased; according to different temperature ranges of the inner coil, the wind shield of the inner motor and the opening degree of the electromagnetic valve are adjusted, so that the adjustment is more accurate; the electric heating is arranged, so that the low-temperature refrigerant which does not enter the internal machine for heat exchange is ensured to absorb heat and evaporate, and the stable operation of the unit is maintained.
The embodiment of the disclosure provides an indoor unit freezing prevention control device, which is used for executing the indoor unit freezing prevention control method, and the indoor unit freezing prevention control device is described in detail below.
As shown in fig. 7, the indoor unit freezing prevention control device includes:
the system comprises an acquisition unit 1, a control unit and a control unit, wherein the acquisition unit is used for acquiring the temperature of an indoor coil in real time in a refrigeration mode;
the judging unit 2 is used for judging whether the evaporator meets the defrosting protection condition or not according to the indoor coil temperature;
and the control unit 3 is used for opening an electromagnetic valve and electric heating if the evaporator meets the defrosting protection condition, wherein the electromagnetic valve and the electric heating are arranged on a bypass pipeline for communicating a refrigerant inlet and a refrigerant outlet of the indoor unit.
Therefore, when the anti-freezing operation is needed, the refrigerant inlet and the refrigerant outlet of the indoor unit are bypassed, and electric heating is carried out, so that the adverse consequences that the service life is shortened and the normal refrigeration experience of a client is influenced due to frequent starting and stopping of the compressor caused by closing the compressor and the outer fan are avoided.
Optionally, when the following conditions are met, determining that the evaporator meets the defrosting protection condition:
the indoor coil temperatures are all less than a second temperature threshold for a first duration.
Optionally, the continuous time of the first duration includes the current time.
Optionally, the control unit 3 is further configured to: if the evaporator does not meet the defrosting protection condition, the electromagnetic valve and the electric heating are closed after the indoor coil temperature is greater than or equal to a first temperature threshold value in the first time period, and the first temperature threshold value is greater than a second temperature threshold value.
Optionally, the control unit 3 is further configured to: if the evaporator does not meet the defrosting protection condition, controlling the electromagnetic valve and the electric heater to be kept closed after the indoor coil temperature is smaller than a first temperature threshold value and larger than or equal to a second temperature threshold value within the first time period, and adjusting the inner fan to be the highest wind level.
Optionally, the control unit 3 is further configured to: after the temperature of the indoor coil pipe is smaller than the second temperature threshold value and larger than or equal to a third temperature threshold value within the first time period, the electric heating is started, and the electromagnetic valve is opened to a first preset opening degree; and after the temperature of the indoor coil pipe is smaller than the third temperature threshold value and larger than or equal to a fourth temperature threshold value within the first time period, opening the electric heater and opening the electromagnetic valve to a second preset opening degree.
Optionally, the control unit 3 is further configured to: and after the temperature of the indoor coil pipe is smaller than the fourth temperature threshold value within the first time period, opening the electric heater and opening the electromagnetic valve to a third preset opening degree.
Optionally, the control unit 3 is further configured to: and after a shutdown instruction is received, the electromagnetic valve and the electric heater are controlled to be kept closed, and then the shutdown instruction is executed.
The embodiment of the present disclosure provides an air conditioner, which includes a computer readable storage medium storing a computer program and a processor, where the computer program is read by the processor and executed to implement the internal machine freezing prevention control method as described above.
Therefore, when the anti-freezing operation is needed, the refrigerant inlet and the refrigerant outlet of the indoor unit are bypassed, and the electric heating is carried out, so that the adverse effects that the service life is shortened and the normal refrigeration experience of a client is influenced due to frequent starting and stopping of the compressor caused by closing the compressor and the external fan are avoided.
The embodiment of the present disclosure also provides a computer-readable storage medium, where instructions are stored, and when the instructions are loaded and executed by a processor, the method for controlling anti-internal-machine freezing may be implemented.
The technical solution of the embodiment of the present invention essentially or partially contributes to the prior art, or all or part of the technical solution may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be an air conditioner, a refrigeration device, a personal computer, a server, or a network device, etc.) or a processor (processor) to execute all or part of the steps of the method of the embodiment of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.
Therefore, when the anti-freezing operation is needed, the refrigerant inlet and the refrigerant outlet of the indoor unit are bypassed, and electric heating is carried out, so that the adverse consequences that the service life is shortened and the normal refrigeration experience of a client is influenced due to frequent starting and stopping of the compressor caused by closing the compressor and the outer fan are avoided.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected by one skilled in the art without departing from the spirit and scope of the invention, as defined in the appended claims.
Claims (8)
1. An indoor unit freezing prevention control method is characterized by comprising the following steps:
under a refrigeration mode, acquiring the temperature of an indoor coil in real time;
judging whether the evaporator meets the defrosting protection condition according to the temperature of the indoor coil, wherein the defrosting protection condition is as follows: the temperature of the indoor coil pipe is smaller than a second temperature threshold value within a first time period, the value range of the first time period is 5-13 s, and the value range of the second temperature threshold value is 4-5 ℃;
if the evaporator meets the defrosting protection condition, an electromagnetic valve and electric heating are opened, the electromagnetic valve and the electric heating are arranged on a bypass pipeline communicated with a refrigerant inlet and a refrigerant outlet of an indoor unit, after the indoor coil temperature is smaller than the second temperature threshold and larger than or equal to a third temperature threshold in the first time period, the electric heating is opened and the electromagnetic valve is opened to a first preset opening degree, after the indoor coil temperature is smaller than the third temperature threshold and larger than or equal to a fourth temperature threshold in the first time period, the electric heating is opened and the electromagnetic valve is opened to a second preset opening degree, and after the indoor coil temperature is smaller than the fourth temperature threshold in the first time period, the electric heating is opened and the electromagnetic valve is opened to a third preset opening degree.
2. The indoor unit freezing prevention control method according to claim 1, wherein the continuous time of the first duration includes a current time.
3. The indoor unit freezing prevention control method according to claim 1, wherein after judging whether the evaporator meets the defrosting protection condition according to the indoor coil temperature, the method further comprises the following steps:
if the evaporator does not meet the defrosting protection condition, the electromagnetic valve and the electric heating are closed after the indoor coil temperature is greater than or equal to a first temperature threshold value in the first time period, and the first temperature threshold value is greater than a second temperature threshold value.
4. The indoor unit freezing prevention control method according to claim 1, wherein after determining whether the evaporator meets the defrosting protection condition according to the indoor coil temperature, the method further comprises:
if the evaporator does not meet the defrosting protection condition, controlling the electromagnetic valve and the electric heater to be kept closed after the indoor coil temperature is smaller than a first temperature threshold value and larger than or equal to a second temperature threshold value within the first time period, and adjusting the inner fan to be the highest wind level.
5. The indoor unit freezing prevention control method according to any one of claims 1 to 4, wherein in the cooling mode, after obtaining the indoor coil temperature in real time, the method further comprises:
and after a shutdown instruction is received, controlling the electromagnetic valve and the electric heater to be kept closed, and executing the shutdown instruction.
6. An anti-freezing control device of an internal machine is characterized by comprising:
the acquisition unit (1) is used for acquiring the temperature of the indoor coil in real time in a refrigeration mode;
the judging unit (2) is used for judging whether the evaporator meets the defrosting protection condition according to the temperature of the indoor coil, and the defrosting protection condition is as follows: the temperature of the indoor coil pipes in a first time period is smaller than a second temperature threshold value, the value range of the first time period is 5-13 s, and the value range of the second temperature threshold value is 4-5 ℃;
a control unit (3) for opening a solenoid valve and electrically heating if the evaporator meets the defrost protection condition, the electromagnetic valve and the electric heater are arranged on a bypass pipeline which is communicated with a refrigerant inlet and a refrigerant outlet of the indoor unit, after the temperature of the indoor coil pipe is smaller than the second temperature threshold value and larger than or equal to a third temperature threshold value within the first time period, the electric heater is turned on, and the electromagnetic valve is opened to a first preset opening degree, after the indoor coil temperatures are all smaller than the third temperature threshold value and greater than or equal to a fourth temperature threshold value within the first time period, the electric heater is turned on, and the electromagnetic valve is opened to a second preset opening degree, and after the temperature of the indoor coil pipe is smaller than the fourth temperature threshold value within the first time period, opening the electric heater and opening the electromagnetic valve to a third preset opening degree.
7. An air conditioner comprising a computer-readable storage medium storing a computer program and a processor, wherein the computer program is read by the processor and executed to implement the indoor unit freezing prevention control method according to any one of claims 1 to 5.
8. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program which, when read and executed by a processor, implements the internal machine freeze prevention control method according to any one of claims 1 to 5.
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| CN112963934B (en) * | 2021-03-17 | 2022-10-04 | 广东Tcl智能暖通设备有限公司 | Air conditioner control method and device, air conditioner and storage medium |
| CN113432236B (en) * | 2021-06-30 | 2023-03-31 | 海信（广东）空调有限公司 | Method of controlling air conditioner, and computer-readable storage medium |
| CN113883655A (en) * | 2021-11-12 | 2022-01-04 | 宁波奥克斯电气股份有限公司 | Air conditioner operation control method and device and air conditioner |
| CN114413418B (en) * | 2022-01-26 | 2023-06-09 | 宁波奥克斯电气股份有限公司 | Automatic restoration method, storage medium and system for multi-split freezing |
| CN114734782B (en) * | 2022-04-25 | 2022-12-16 | 杭州绿能新能源汽车部件有限公司 | Control method of thermal management system |
| CN115654661A (en) * | 2022-08-19 | 2023-01-31 | 珠海格力电器股份有限公司 | Air conditioner anti-freezing control method and air conditioner |
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Effective date of registration: 20221020 Address after: 315191 No. 1166 Mingguang North Road, Jiangshan Town, Ningbo, Zhejiang, Yinzhou District Patentee after: NINGBO AUX ELECTRIC Co.,Ltd. Patentee after: AUX AIR CONDITIONING LIMITED BY SHARE Ltd. Address before: 315000 No.1166 Mingguang North Road, Jiangshan Town, Yinzhou District, Ningbo City, Zhejiang Province Patentee before: NINGBO AUX ELECTRIC Co.,Ltd. Patentee before: Ningbo Oxfam intelligent commercial air conditioning manufacturing Co.,Ltd. |