CN108826556B - Air conditioning system, control method of air conditioning system, and computer-readable storage medium - Google Patents
Air conditioning system, control method of air conditioning system, and computer-readable storage medium Download PDFInfo
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- CN108826556B CN108826556B CN201810960412.8A CN201810960412A CN108826556B CN 108826556 B CN108826556 B CN 108826556B CN 201810960412 A CN201810960412 A CN 201810960412A CN 108826556 B CN108826556 B CN 108826556B
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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
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0003—Exclusively-fluid systems
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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
- F24F11/89—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/006—Accumulators
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Abstract
The invention discloses an air conditioning system which comprises a compressor, a condenser, an evaporator, a liquid storage tank, a first temperature sensor, a second temperature sensor and a processor, wherein the processor is used for acquiring the return air temperature of the compressor detected by the first temperature sensor and the inlet temperature of the evaporator detected by the second temperature sensor after the air conditioning system is in a low-temperature refrigeration mode and operates for a first preset time, and recovering excessive refrigerant in the evaporator to the liquid storage tank when the temperature difference between the return air temperature and the inlet temperature is smaller than or equal to a first preset temperature difference. The invention also discloses a control method of the air conditioning system and a computer readable storage medium. Therefore, the problem that when the air conditioning system operates in a low-temperature refrigeration mode, due to insufficient evaporation of the evaporator, the refrigerant flowing back to the compressor by the evaporator is in a liquid state, so that the compressor operates with liquid and is damaged is solved, and the service life of the compressor is prolonged.
Description
Technical Field
The present invention relates to the field of air conditioning technologies, and in particular, to an air conditioning system, a control method of the air conditioning system, and a computer-readable storage medium.
Background
The refrigerant charging amount of the traditional air conditioning system is adjusted to be optimal in energy efficiency according to standard indoor and outdoor temperatures in the air conditioning development process, but when the refrigerant charging amount is installed and used by users, the optimal demand of the air conditioning system on the refrigerant flow is changed due to different environmental temperatures. For example: under the low-temperature refrigeration condition that the outdoor side temperature is lower, because the outside temperature is low, the condensation effect of condenser is fabulous, and required refrigerant demand is few, if the refrigerant dosage is too much, then leads to evaporating inadequately, and the refrigerant that flows back to the compressor from the evaporimeter is the liquid state, if long-term liquid operation then probably damages the compressor, brings unnecessary trouble for user and maintenance.
Disclosure of Invention
The invention mainly aims to provide an air conditioning system, a control method of the air conditioning system and a computer readable storage medium, which solve the problem that when the air conditioning system runs in a low-temperature refrigeration mode, because an evaporator is not evaporated sufficiently, a refrigerant which flows back to a compressor from the evaporator is in a liquid state, so that the compressor runs with liquid and is damaged.
The invention provides an air conditioning system which comprises a compressor, a condenser, an evaporator and a liquid storage tank, wherein one end of the compressor is connected with one end of the condenser, the other end of the condenser is connected with one end of the evaporator, the other end of the evaporator is connected with the other end of the compressor, and the liquid storage tank is arranged at one end of the compressor, which is connected with the evaporator; further comprising:
a first temperature sensor for detecting a return air temperature of the compressor;
a second temperature sensor for detecting an inlet temperature of the evaporator;
the processor is used for acquiring the return air temperature of the compressor detected by the first temperature sensor after the air conditioning system is in a low-temperature refrigeration mode and runs for a first preset time, and acquiring the inlet temperature of the evaporator detected by the second temperature sensor, wherein the return air temperature is lower than or equal to the first preset temperature difference, and excessive refrigerant in the evaporator is recovered to the liquid storage tank.
Further, the processor is also used for supplementing the refrigerant stored in the liquid storage tank to the compressor when the temperature difference between the return air temperature and the inlet temperature is greater than or equal to a second preset temperature difference.
Further, the air conditioning system further comprises a gas-liquid separator, one end of the gas-liquid separator is connected with the evaporator, the other end of the gas-liquid separator is connected with the compressor, and the liquid storage tank is connected with the compressor and the evaporator through the gas-liquid separator respectively.
Further, the air conditioning system further comprises an electromagnetic valve arranged between the gas-liquid separator and the liquid storage tank, the electromagnetic valve is connected with the processor, and the processor is further used for controlling the electromagnetic valve to be opened and closed.
Further, the air conditioning system also comprises a four-way valve with four ports, wherein two ports are used for connecting the compressor and the condenser, and the other two ports are used for connecting the evaporator and the gas-liquid separator.
In order to achieve the above object, the present invention further provides a control method of an air conditioning system, including:
after the air conditioning system is in a low-temperature refrigeration mode and operates for a first preset time, detecting the return air temperature of the compressor through the first temperature sensor, and detecting the inlet temperature of the evaporator through the second temperature sensor;
calculating the temperature difference between the return air temperature and the inlet temperature;
and when the temperature difference is less than or equal to a first preset temperature difference, recovering excessive refrigerant in the evaporator to the liquid storage tank.
Further, the control system also comprises an electromagnetic valve, and the initial state of the electromagnetic valve is an opening state; further comprising, after the step of calculating the temperature difference between the return air temperature and the inlet temperature:
when the temperature difference is greater than or equal to a second preset temperature difference, the refrigerant stored in the liquid storage tank is supplemented to the compressor; or
The difference in temperature is greater than the first predetermined difference in temperature, just the difference in temperature is less than when the second predetermined difference in temperature, close the solenoid valve.
Further, when the air conditioning system is in a low-temperature refrigeration mode and operates for a second preset time, the first temperature sensor detects the return air temperature of the compressor again, the second temperature sensor detects the inlet temperature of the evaporator again, and a second temperature difference between the detected return air temperature and the inlet temperature is calculated, and the following steps are executed:
when the second temperature difference is smaller than or equal to the first preset temperature difference, recovering excessive refrigerant in the evaporator to the liquid storage tank;
when the second temperature difference is greater than or equal to the second preset temperature difference, supplementing the refrigerant stored in the liquid storage tank to the compressor;
when the second temperature difference is greater than the first preset temperature difference, and the second temperature difference is less than the second preset temperature difference, the electromagnetic valve is closed.
Further, after the air conditioning system is in the low-temperature refrigeration mode and operates for a first preset time, before the steps of detecting the return air temperature of the compressor by the first temperature sensor and detecting the inlet temperature of the evaporator by the second temperature sensor, the method further includes:
acquiring an indoor environment temperature, and comparing the indoor environment temperature with a preset temperature;
when the indoor environment temperature is greater than or equal to the preset temperature, controlling the air conditioning system to start a common refrigeration mode;
and when the indoor environment temperature is lower than the preset temperature, controlling the air conditioning system to start a low-temperature refrigeration mode.
To achieve the above object, the present invention also provides a computer-readable storage medium having stored thereon a control program of an air conditioning system, which when executed by a processor, implements the steps of the control method of the air conditioning system as described above.
According to the air conditioning system, the control method of the air conditioning system and the computer readable storage medium, the return air temperature of the compressor detected by the first temperature sensor and the inlet temperature of the evaporator detected by the second temperature sensor are obtained after the air conditioning system is in the low-temperature refrigeration mode and operates for the first preset time, and when the temperature difference between the return air temperature and the inlet temperature is smaller than or equal to the first preset temperature difference, excessive refrigerant in the evaporator is recycled to the liquid storage tank. Therefore, the problem that when the air conditioning system operates in a low-temperature refrigeration mode, due to insufficient evaporation of the evaporator, the refrigerant flowing back to the compressor by the evaporator is in a liquid state, so that the compressor operates with liquid and is damaged is solved, and the service life of the compressor is prolonged.
Drawings
FIG. 1 is a block diagram schematically illustrating the structure of an air conditioning system according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating steps of a method for controlling an air conditioner according to another embodiment of the present invention;
FIG. 3 is a detailed flowchart of S200 according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating a method for controlling an air conditioner according to another embodiment of the present invention.
Description of reference numerals:
| reference numerals | Name (R) | Reference numerals | Name (R) | Reference numerals | Name (R) |
| 1 | |
5 | Throttle device | 9 | Electromagnetic valve |
| 2 | Condensation Device for cleaning the skin | 6 | |
10 | Four- |
| 3 | Evaporator with a heat exchanger | 7 | Second temperature sensor | ||
| 4 | Liquid storage tank | 8 | Gas-liquid separator |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides an air conditioning system, as shown in fig. 1, in one embodiment, the air conditioning system comprises a compressor 1, a condenser 2, an evaporator 3 and a liquid storage tank 4, wherein one end of the compressor 1 is connected with one end of the condenser 2, the other end of the condenser 2 is connected with one end of the evaporator 3, the other end of the evaporator 3 is connected with the other end of the compressor 1, and the liquid storage tank 4 is arranged at one end of the compressor 1 connected with the evaporator 3. Specifically, in this embodiment, when the air conditioning system is in the low-temperature refrigeration mode, the compressor 1 operates the low-temperature and low-pressure refrigerant by the motor on the compressor 1 and drives the piston to compress the refrigerant, and then forms the high-temperature and high-pressure refrigerant, and transmits the high-temperature and high-pressure refrigerant to the condenser 2, where it can be understood that the refrigerant is a gaseous refrigerant; the condenser 2 receives the high-temperature and high-pressure gaseous refrigerant and converts the gaseous refrigerant into condensate, the condensate is conveyed into the evaporator 3, and a large amount of heat is generated in the process of converting the condensate and is transferred into air; the evaporator 3 receives the condensate, heats and evaporates the condensate, converts the condensate into gas, returns the gas to the compressor 1, and absorbs a large amount of heat from air in the process of converting the condensate into the gas so as to achieve the refrigeration effect.
Of course, the receiver tank 4 serves to store an excessive amount of refrigerant in the evaporator 3 or to supplement the refrigerant to the compressor 1 when the amount of refrigerant in the compressor 1 is insufficient. Preferably, a throttling device 5 is arranged between the condenser 2 and the evaporator 3, the throttling device 5 can control the fluid flow by changing the throttling section or the throttling length, namely the flow of the condensate converted by the condenser 2 to the evaporator 3 can be controlled by the throttling device 5, in the embodiment, the throttling device 5 comprises but is not limited to a throttling valve, a flow meter and the like, but in other implementations, the throttling device is not limited thereto. It should be understood that, in the present embodiment, only the operating state of the air conditioning system in the low-temperature cooling mode is illustrated, and only a part of the structure of the air conditioning system is illustrated, in the remaining embodiments, the air conditioning system may further set other operating modes, such as a heating mode, and the like, without limitation; the air conditioning system may have more or less structures according to specific requirements, and is not limited herein.
Therefore, in the present embodiment, in order to determine whether there is an excessive amount of refrigerant when the air conditioning system is operating, the air conditioning system further includes a first temperature sensor 6, a second temperature sensor 7, and a processor (not shown). The first temperature sensor 6 is arranged on the return air loop of the compressor 1 and is used for detecting the return air temperature of the compressor 1, specifically the temperature of the gas which is evaporated by the evaporator 3 and then transmitted to the compressor 1; the second temperature sensor 7 is arranged between the evaporator 3 and the condenser 2, is positioned at the liquid inlet close to the evaporator 3, and is used for detecting the inlet temperature of the evaporator 3 and specifically detecting the temperature of condensate formed after the condenser 2 is condensed.
Specifically, the first temperature sensor 6 and the second temperature sensor 7 are both connected with the processor, the processor is used for acquiring the return air temperature of the compressor 1 detected by the first temperature sensor 6 and the inlet temperature of the evaporator 3 detected by the second temperature sensor 7 after the air conditioning system is in the low-temperature refrigeration mode and operates for a first preset time, and when the temperature difference between the return air temperature and the inlet temperature is smaller than or equal to a first preset temperature difference, excessive refrigerant in the evaporator 3 is controlled to be recovered to the liquid storage tank 4, so that the condensate in the evaporator 3 can be fully evaporated, the phase-change refrigeration amount is increased, and the energy efficiency of the air conditioning system is further improved. In this embodiment, the processor is further configured to control the refrigerant stored in the liquid storage tank 4 to be supplemented to the compressor 1 to ensure the normal operation of the compressor 1 when the temperature difference between the return air temperature and the inlet temperature is greater than or equal to a second preset temperature difference. This way. Through the arrangement of the liquid storage tank 4, the refrigerant can be received and released according to the requirements of the air conditioning system, so that the most suitable refrigerant demand is provided, and the refrigeration effect of the air conditioning system is ensured.
In order to enable the temperatures detected by the first temperature sensor 6 and the second temperature sensor 7 to be more accurate, the air conditioning system is stable in a low-temperature refrigeration mode after running for a first preset time, data fluctuation in all aspects is small, at the moment, the accuracy of temperature data detected by the first temperature sensor 6 and the second temperature sensor 7 is high, and therefore the accuracy of judgment of the processor is improved. The first predetermined time is preferably 10min in this embodiment, but in other embodiments of the present invention, the first predetermined time may be other values, such as 15min, 20min, and the like, without limitation. Preferably, the first temperature sensor 6 and the second temperature sensor 7 are both thermistor temperature sensors, and in other embodiments, the first temperature sensor 6 and the second temperature sensor 7 may further include, but are not limited to, platinum resistance temperature sensors, thermocouple temperature sensors, and the like.
Preferably, the first predetermined temperature difference is 0 ℃ and the second predetermined temperature difference is 5 ℃. When the temperature difference between the return air temperature and the inlet temperature is less than or equal to 0 ℃, the condensate of the evaporator 3 is not completely evaporated into gas, and at the moment, the excessive condensate in the evaporator 3 needs to be controlled to be stored in the liquid storage tank 4; when the temperature difference between the return air temperature and the inlet temperature is greater than or equal to 5 ℃, the return air temperature of the compressor 1 is higher, namely, the gaseous refrigerant in the compressor 1 is less at the moment, and the refrigerant in the liquid storage tank 4 needs to absorb heat to be changed into gaseous state and be supplemented to the compressor 1, so that the compressor 1 can work normally. Of course, it can be understood that, in other embodiments, the first preset temperature difference and the second preset temperature difference may be set to other values according to user experience or requirement for judgment, and the specific set values are not limited in the application of the present invention.
According to the air conditioning system provided by the embodiment of the invention, after the air conditioning system is in the low-temperature refrigeration mode and operates for the first preset time, the return air temperature of the compressor 1 detected by the first temperature sensor 6 and the inlet temperature of the evaporator 3 detected by the second temperature sensor 7 are obtained, and when the temperature difference between the return air temperature and the inlet temperature is smaller than or equal to the first preset temperature difference, excessive refrigerant in the evaporator 3 is recycled to the liquid storage tank 4. Therefore, the problem that when the air conditioning system operates in a low-temperature refrigeration mode, due to insufficient evaporation of the evaporator 3, the refrigerant flowing back to the compressor 1 from the evaporator 3 is in a liquid state, so that the compressor 1 operates with the liquid and is damaged is solved, and the service life of the compressor 1 is prolonged.
In an embodiment of the present invention, in order to determine an operation mode of the air conditioning system, the air conditioning system further includes a third temperature sensor (not shown), which is a room temperature detection sensor, preferably a non-contact infrared sensor, for collecting a temperature of the room. However, in other embodiments, the third temperature sensor may also be used as other sensors or as a device for detecting temperature, and is not limited in the present application. Specifically, the third temperature sensor is connected with the processor and used for collecting the indoor temperature, comparing the indoor temperature with the preset temperature, and when the indoor temperature is greater than or equal to the preset temperature, the processor controls the air conditioning system to operate in a common refrigeration mode; and when the indoor temperature is less than or equal to the preset temperature, the processor controls the air conditioning system to operate in a low-temperature refrigeration mode. Preferably, the preset temperature is set to 25 ℃, and in other embodiments, the preset temperature may be set to other values, such as 24 ℃, 26 ℃ and the like, according to the personal comfort experience of the user, which is not limited in the present application. It can be understood that, in the embodiment of the present invention, it is mainly determined whether the air conditioning system is in the cooling mode, and for other operation modes of the air conditioning system, the operation modes are consistent with those of the other air conditioning systems and/or the air conditioning equipment, and are not described herein again.
In the embodiment of the present invention, in order to prevent the liquid refrigerant from flowing back to the compressor 1, the air conditioning system further includes a gas-liquid separator 8, one end of the gas-liquid separator 8 is connected to the evaporator 3, the other end is connected to the compressor 1, and the receiver 4 is connected to the compressor 1 and the evaporator 3 through the gas-liquid separator 8, respectively. Specifically, one end of the gas-liquid separator 8 is disposed at the outlet end of the evaporator 3, the other end is disposed at the air inlet of the compressor 1, and the gas-liquid separator 8 is disposed adjacent to the compressor 1, for separating the liquid refrigerant and the gaseous refrigerant, and preventing the liquid refrigerant from flowing back into the compressor 1.
Preferably, in order to monitor the storage state of the refrigerant in the air conditioning system, the air conditioning system further comprises an electromagnetic valve 9 arranged between the gas-liquid separator 8 and the liquid storage tank 4, and the electromagnetic valve 9 is connected with the processor, and the processor is further used for controlling the opening and closing of the electromagnetic valve. Specifically, the solenoid valve 9 is a two-way solenoid valve. The pipeline for transmitting the refrigerant is connected to the opening of the liquid storage tank 4 and is communicated with the interior of the liquid storage tank 4, but the pipeline does not extend to the interior of the liquid storage tank 4, namely the pipeline does not contact with the refrigerant stored in the liquid storage tank 4, so that the refrigerant is prevented from flowing back through the pipeline. In this embodiment, the refrigerant stored in the liquid storage tank 4 is a liquid refrigerant, when the return air temperature of the compressor 1 is high, that is, the gas refrigerant in the compressor 1 is low at this time, because the gas-liquid separator 8 is a low-pressure region, the processor controls the electromagnetic valve 9 to open at this time, the liquid refrigerant stored in the liquid storage tank 4 absorbs heat in the air around the liquid storage tank 4 and turns into the gas refrigerant, and the gas refrigerant is supplemented into the compressor 1 through the pipeline and the gas-liquid separator 8, so that the compressor 1 keeps normal operation. At this time, since the return air temperature of the compressor 1 is high, that is, the condensate transferred from the condenser 2 to the evaporator 3 is completely evaporated, the evaporator 3 does not have excessive condensate to be recovered to the receiver 4 during the process of replenishing the gaseous refrigerant in the receiver 4 to the compressor 1.
Specifically, the initial state of the electromagnetic valve 9 is an open state. At this time, when the temperature difference between the return air temperature and the inlet temperature is less than or equal to the first preset temperature difference, the condensate of the evaporator 3 is not completely evaporated into gas, and at this time, excessive condensate in the evaporator 3 is stored in the liquid storage tank 4; when the temperature difference between the return air temperature and the inlet temperature is greater than or equal to a second preset temperature difference, the return air temperature of the compressor 1 is higher, namely, the gaseous refrigerant in the compressor 1 is less at the moment, and the refrigerant in the liquid storage tank 4 absorbs heat to become gaseous and is supplemented to the compressor 1, so that the compressor 1 can normally work; when the temperature difference between the return air temperature and the inlet temperature is greater than the first preset temperature difference and the temperature difference between the return air temperature and the inlet temperature is less than the second preset temperature difference, the electromagnetic valve 9 is closed. Preferably, when the air conditioning system is in the normal cooling mode, the electromagnetic valve 9 is kept in an open state to recover or supplement the refrigerant in the air conditioning system at any time. It will be appreciated that the opening and closing of the solenoid valve 9 is controlled by a processor in the air conditioning system.
In this embodiment, in order to ensure the comfort of the user, the return air temperature of the compressor 1 and the inlet temperature of the evaporator 3 need to be re-detected and re-determined every time the air conditioning system operates for a second preset time, so as to update the temperature data and ensure that the refrigerant of the air conditioning system can be maintained in a normal operating state. Specifically, when the air conditioning system is in a low-temperature refrigeration mode and operates for a second preset time, the first temperature sensor detects the return air temperature of the compressor again, the second temperature sensor detects the inlet temperature of the evaporator again, and a second temperature difference between the detected return air temperature and the inlet temperature is calculated. If the electromagnetic valve 9 is in a closed state at the moment, when the second temperature difference is smaller than or equal to the first preset temperature difference, the processor controls the electromagnetic valve 9 to be opened, and excessive refrigerant in the evaporator 3 is recovered to the liquid storage tank 4; when the second temperature difference is greater than or equal to the second preset temperature difference, the processor controls the electromagnetic valve 9 to be opened, and the refrigerant stored in the liquid storage tank 4 absorbs heat to be changed into a gas state and is supplemented to the compressor; when the second temperature difference is greater than the first preset temperature difference and the second temperature difference is less than the second preset temperature difference, the closing state of the electromagnetic valve 9 is continuously kept. In addition, if the electromagnetic valve 9 is in an open state at this time, when the second temperature difference is less than or equal to the first preset temperature difference, the excessive refrigerant in the evaporator 3 is recovered to the liquid storage tank 4; when the second temperature difference is greater than or equal to the second preset temperature difference, the refrigerant stored in the liquid storage tank 4 absorbs heat to be changed into a gas state and is supplemented to the compressor; when the second temperature difference is greater than the first preset temperature difference and the second temperature difference is less than the second preset temperature difference, the processor controls the electromagnetic valve 9 to close. Preferably, the second preset time is 1h, and the second preset time for operating the air conditioning system is to detect the temperature data again every other hour after detecting the temperature data for the first time. Of course, it is understood that in other embodiments, the second preset time may be other preset times, such as 30min, 45min, etc., and is not limited in the present application.
Preferably, in order to enable switching of the cooling and heating modes in the air conditioning system, the air conditioning system further includes a four-way valve 10 having four ports, two of which are used to connect the compressor 1 and the condenser 2 and the other two of which are used to connect the evaporator 3 and the gas-liquid separator 4. In this embodiment, the channels among the compressor 1, the condenser 2, the evaporator 3, and the gas-liquid separator 4 can be switched by the action of the four-way valve 10 to realize the switching between the cooling and heating modes of the air conditioning system, and the implementation principle thereof is consistent with that of the existing air conditioning system and/or air conditioning equipment, and is not described herein again.
According to the air conditioning system provided by the embodiment of the invention, after the air conditioning system is in the low-temperature refrigeration mode and operates for the first preset time, the return air temperature of the compressor 1 detected by the first temperature sensor 6 and the inlet temperature of the evaporator 3 detected by the second temperature sensor 7 are obtained, and when the temperature difference between the return air temperature and the inlet temperature is smaller than or equal to the first preset temperature difference, excessive refrigerant in the evaporator 3 is recycled to the liquid storage tank 4. Therefore, the problem that when the air conditioning system operates in a low-temperature refrigeration mode, due to insufficient evaporation of the evaporator 3, the refrigerant flowing back to the compressor 1 from the evaporator 3 is in a liquid state, so that the compressor 1 operates with the liquid and is damaged is solved, and the service life of the compressor 1 is prolonged.
Based on the above embodiment, referring to fig. 2, another embodiment of the present invention further provides a control method of an air conditioner, where the control method of the air conditioning system includes the following steps:
s100, after the air conditioning system is in a low-temperature refrigeration mode and operates for a first preset time, detecting the return air temperature of the compressor through the first temperature sensor, and detecting the inlet temperature of the evaporator through the second temperature sensor;
in this step, after the air conditioning system is in the low-temperature refrigeration mode and operates for a first preset time, the return air temperature of the compressor is detected by the first temperature sensor, and the inlet temperature of the evaporator is detected by the second temperature sensor. Specifically, the first temperature sensor is arranged on an air return loop of the compressor and used for detecting the air return temperature of the compressor, specifically the temperature of gas transmitted to the compressor after the evaporator is evaporated; the second temperature sensor is arranged between the evaporator and the condenser and is positioned at the liquid inlet close to the evaporator and used for detecting the inlet temperature of the evaporator and specifically detecting the temperature of condensate formed by the condenser after condensation.
Preferably, the first predetermined time is preferably 10min in this embodiment, but in other embodiments of the present invention, the first predetermined time may be other values, such as 15min, 20min, and the like, without limitation.
S200, calculating the temperature difference between the return air temperature and the inlet temperature;
in this step, the temperature difference between the return air temperature and the inlet temperature is calculated. Specifically, the difference value is obtained by subtracting the inlet temperature from the return air temperature.
S300, when the temperature difference is smaller than or equal to a first preset temperature difference, recovering excessive refrigerant in the evaporator to the liquid storage tank.
In this step, when the temperature difference is less than or equal to the first preset temperature difference, the excess refrigerant in the evaporator is recovered to the liquid storage tank. Preferably, the first predetermined temperature difference is 0 ℃. When the temperature difference between the return air temperature and the inlet temperature is less than or equal to 0 ℃, the condensate of the evaporator is not completely evaporated into gas, and at the moment, excessive condensate in the evaporator needs to be stored in the liquid storage tank. Of course, it is understood that in other embodiments, the first preset temperature difference may be set to other values according to user experience or requirement, and the specific set value is not limited in the application of the present invention.
Like this, this embodiment detects through first temperature sensor after air conditioning system is in low temperature refrigeration mode and runs first preset time the return air temperature of compressor to and the inlet temperature that detects the evaporimeter through second temperature sensor, and calculate the difference in temperature of return air temperature and inlet temperature, when the difference in temperature is less than or equal to first preset difference in temperature, retrieve to the liquid storage pot too much refrigerant in the evaporimeter. The problem that when the air-conditioning system operates in a low-temperature refrigeration mode, due to insufficient evaporation of the evaporator, the refrigerant flowing back to the compressor by the evaporator is in a liquid state, so that the compressor operates with liquid and is damaged is solved, and the service life of the compressor is prolonged.
In this embodiment, referring to fig. 3, the control system further includes a solenoid valve, and the initial state of the solenoid valve is an open state. After S200, further comprising:
s210, when the temperature difference is larger than or equal to a second preset temperature difference, the refrigerant stored in the liquid storage tank is supplemented to the compressor;
in this step, when the temperature difference is greater than or equal to a second preset temperature difference, the refrigerant stored in the liquid storage tank absorbs heat to change into a gaseous state and is supplemented to the compressor. Preferably, the second predetermined temperature difference is 5 ℃. When the temperature difference between the return air temperature and the inlet temperature is greater than or equal to 5 ℃, the return air temperature of the compressor is higher, namely, the gaseous refrigerant in the compressor is less at the moment, and the refrigerant stored in the liquid storage tank absorbs heat to be changed into gaseous state and is supplemented to the compressor, so that the compressor can work normally. Of course, it is understood that in other embodiments, the second preset temperature difference may be set to other values according to user experience or requirement, and the specific set value is not limited in the application of the present invention.
S220, the temperature difference is larger than the first preset temperature difference, and the temperature difference is smaller than the second preset temperature difference, the electromagnetic valve is closed.
In this step, when the temperature difference is greater than the first preset temperature difference and the temperature difference is less than the second preset temperature difference, at this time, the air conditioning system keeps the low-temperature refrigeration mode running, and at this time, the electromagnetic valve is closed.
In order to ensure the comfort of the user, the embodiment of the control method based on the air conditioner needs to detect the return air temperature of the compressor and the inlet temperature of the evaporator again every time the air conditioning system operates for a second preset time, and makes a judgment again to update the temperature data and ensure that the refrigerant of the air conditioning system can be maintained in a normal working state. Specifically, the method comprises the following steps:
when the air conditioning system is in a low-temperature refrigeration mode and operates for a second preset time, the first temperature sensor detects the return air temperature of the compressor again, the second temperature sensor detects the inlet temperature of the evaporator again, the second temperature difference between the detected return air temperature and the inlet temperature is calculated, and the following steps are executed:
s1, when the second temperature difference is smaller than or equal to the first preset temperature difference, recovering excessive refrigerant in the evaporator to the liquid storage tank;
s2, when the second temperature difference is larger than or equal to the second preset temperature difference, supplementing the refrigerant stored in the liquid storage tank to the compressor;
s3, when the second temperature difference is larger than the first preset temperature difference, and the second temperature difference is smaller than the second preset temperature difference, the electromagnetic valve is closed.
When the state of the electromagnetic valve is in a closed state in the control method of the air conditioner, when the second temperature difference is smaller than or equal to the first preset temperature difference, the electromagnetic valve is controlled to be opened through the processor, and excessive refrigerant in the evaporator is recovered to the liquid storage tank; when the second temperature difference is larger than or equal to the second preset temperature difference, the electromagnetic valve is controlled to be opened through the processor, and the refrigerant stored in the liquid storage tank absorbs heat to be changed into a gas state and is supplemented to the compressor; and when the second temperature difference is greater than the first preset temperature difference and the second temperature difference is less than the second preset temperature difference, the operation is continuously kept.
When the state of the electromagnetic valve is an opening state in the control method of the air conditioner, when the second temperature difference is smaller than or equal to the first preset temperature difference, recovering excessive refrigerant in the evaporator to the liquid storage tank; when the second temperature difference is greater than or equal to the second preset temperature difference, the refrigerant stored in the liquid storage tank absorbs heat to be changed into a gas state and is supplemented to the compressor; and when the second temperature difference is greater than the first preset temperature difference and the second temperature difference is less than the second preset temperature difference, closing the electromagnetic valve.
Preferably, the second preset time is 1h, and the second preset time for operating the air conditioning system is to detect the temperature data again every other hour after detecting the temperature data for the first time. Of course, it is understood that in other embodiments, the second preset time may be other preset times, such as 30min, 45min, etc., and is not limited in the present application.
Therefore, the present embodiment can ensure that the refrigerant of the air conditioning system can be maintained in a normal working state by re-detecting the return air temperature of the compressor and the inlet temperature of the evaporator and performing re-judgment to update the temperature data.
On the basis of the embodiment of the control method of the air conditioner, referring to fig. 4, before S100, the method further includes:
s01, acquiring an indoor environment temperature, and comparing the indoor environment temperature with a preset temperature;
in this step, the indoor temperature may be collected by the third temperature sensor, the indoor temperature may be compared with a preset temperature, and the operating mode of the air conditioning system may be determined according to the comparison result.
S02, when the indoor environment temperature is greater than or equal to the preset temperature, controlling the air conditioning system to start a common refrigeration mode;
and when the comparison result in the S01 is that the indoor environment temperature is greater than or equal to the preset temperature, the processor controls the air conditioning system to operate the ordinary cooling mode.
And S03, when the indoor environment temperature is lower than the preset temperature, controlling the air conditioning system to start a low-temperature refrigeration mode.
And when the comparison result in the S01 is that the indoor environment temperature is less than the preset temperature, the processor controls the air conditioning system to operate the low-temperature cooling mode.
Preferably, the preset temperature in S02 or S03 is set to 25 ℃, and in other embodiments, the preset temperature may be set to other values, such as 24 ℃, 26 ℃ and the like, according to the personal comfort experience of the user, which is not limited in the present application. It can be understood that, in the embodiment of the present invention, it is mainly determined whether the air conditioning system is in the cooling mode, and for other operation modes of the air conditioning system, the operation modes are consistent with those of the other air conditioning systems and/or the air conditioning equipment, and are not described herein again.
Therefore, the indoor environment temperature and the preset temperature can be compared to control the working mode of the air conditioning system, and the personal comfort level experience of a user is improved.
Further, based on the above embodiments, an embodiment of the present invention also provides a computer-readable storage medium having a control program of an air conditioning system stored thereon, the control program of the air conditioning system, when executed by a processor, implementing the operations of:
after the air conditioning system is in a low-temperature refrigeration mode and operates for a first preset time, detecting the return air temperature of the compressor through the first temperature sensor, and detecting the inlet temperature of the evaporator through the second temperature sensor;
calculating the temperature difference between the return air temperature and the inlet temperature;
and when the temperature difference is less than or equal to a first preset temperature difference, recovering excessive refrigerant in the evaporator to the liquid storage tank.
Further, wherein the control system further comprises a solenoid valve, and the control program of the air conditioning system, when executed by the processor, further implements the following operations:
the initial state of the electromagnetic valve is an opening state; further comprising, after the step of calculating the temperature difference between the return air temperature and the inlet temperature:
when the temperature difference is greater than or equal to a second preset temperature difference, the refrigerant stored in the liquid storage tank is supplemented to the compressor; or
The temperature difference is greater than the first preset temperature difference, and the temperature difference is less than the second preset temperature difference, the electromagnetic valve is closed
The specific embodiment of the low temperature refrigeration control program of the air conditioning system executed by the processor is described above, and is not described herein again.
Further, when the air conditioning system is in the low-temperature refrigeration mode and operates for a second preset time, the first temperature sensor detects the return air temperature of the compressor again, the second temperature sensor detects the inlet temperature of the evaporator again, and a second temperature difference between the detected return air temperature and the inlet temperature is calculated, and when the control program of the air conditioning system is executed by the processor, the following operations are further implemented:
when the second temperature difference is smaller than or equal to the first preset temperature difference, recovering excessive refrigerant in the evaporator to the liquid storage tank;
when the second temperature difference is greater than or equal to the second preset temperature difference, supplementing the refrigerant stored in the liquid storage tank to the compressor;
when the second temperature difference is greater than the first preset temperature difference, and the second temperature difference is less than the second preset temperature difference, the electromagnetic valve is closed
Further, the control program of the air conditioning system, when executed by the processor, further implements the following operations:
acquiring an indoor environment temperature, and comparing the indoor environment temperature with a preset temperature;
when the indoor environment temperature is greater than or equal to the preset temperature, controlling the air conditioning system to start a common refrigeration mode;
and when the indoor environment temperature is lower than the preset temperature, controlling the air conditioning system to start a low-temperature refrigeration mode.
Therefore, the problem that when the air conditioning system operates in a low-temperature refrigeration mode, due to insufficient evaporation of the evaporator, the refrigerant flowing back to the compressor by the evaporator is in a liquid state, so that the compressor operates with liquid and is damaged is solved, and the service life of the compressor is prolonged.
According to the air conditioning system provided by the embodiment of the invention, after the air conditioning system is in the low-temperature refrigeration mode and operates for the first preset time, the return air temperature of the compressor 1 detected by the first temperature sensor 6 and the inlet temperature of the evaporator 3 detected by the second temperature sensor 7 are obtained, and when the temperature difference between the return air temperature and the inlet temperature is smaller than or equal to the first preset temperature difference, excessive refrigerant in the evaporator 3 is recycled to the liquid storage tank 4. Therefore, the problem that when the air conditioning system operates in a low-temperature refrigeration mode, due to insufficient evaporation of the evaporator 3, the refrigerant flowing back to the compressor 1 from the evaporator 3 is in a liquid state, so that the compressor 1 operates with the liquid and is damaged is solved, and the service life of the compressor 1 is prolonged.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. An air conditioning system is characterized by comprising a compressor, a condenser, an evaporator, an electromagnetic valve and a liquid storage tank, wherein one end of the compressor is connected with one end of the condenser, the other end of the condenser is connected with one end of the evaporator, the other end of the evaporator is connected with the other end of the compressor, the liquid storage tank is arranged at one end of the compressor connected with the evaporator, and the electromagnetic valve is arranged between the evaporator and the liquid storage tank; further comprising:
a first temperature sensor for detecting a return air temperature of the compressor;
a second temperature sensor for detecting an inlet temperature of the evaporator;
the treater, the treater with the solenoid valve is connected in order to control the switch of solenoid valve, the treater is used for air conditioning system is in low temperature refrigeration mode and runs after first preset time, acquires first temperature sensor detects the return air temperature of compressor, and second temperature sensor detects the import temperature of evaporimeter, and return air temperature with when the difference in temperature of import temperature is less than or equal to first preset difference in temperature, open the solenoid valve will too much refrigerant is retrieved extremely in the evaporimeter the liquid storage pot still is used for return air temperature with the difference in temperature of import temperature is greater than when first preset difference in temperature and be less than the second preset difference in temperature, closes the solenoid valve.
2. The air conditioning system of claim 1, wherein the processor is further configured to replenish the refrigerant stored in the reservoir tank to the compressor when the difference between the return air temperature and the inlet temperature is greater than or equal to a second predetermined temperature difference.
3. The air conditioning system as claimed in claim 1, further comprising a gas-liquid separator, wherein one end of the gas-liquid separator is connected to the evaporator, the other end is connected to the compressor, and the liquid storage tank is connected to the compressor and the evaporator through the gas-liquid separator, respectively, and the gas-liquid separator is disposed adjacent to the compressor.
4. The air conditioning system as claimed in claim 3, wherein said solenoid valve is disposed between said gas-liquid separator and said liquid reservoir.
5. The air conditioning system as claimed in claim 4, further comprising a four-way valve having four ports, two ports for connecting the compressor and the condenser, and the other two ports for connecting the evaporator and the gas-liquid separator.
6. A control method of an air conditioning system according to any one of claims 1 to 5, wherein the air conditioning system includes a solenoid valve, and an initial state of the solenoid valve is an open state, comprising the steps of:
after the air conditioning system is in a low-temperature refrigeration mode and operates for a first preset time, detecting the return air temperature of the compressor through the first temperature sensor, and detecting the inlet temperature of the evaporator through the second temperature sensor;
calculating the temperature difference between the return air temperature and the inlet temperature;
when the temperature difference between the return air temperature and the inlet temperature is smaller than or equal to a first preset temperature difference, controlling the electromagnetic valve to keep an opening state, and recovering excessive refrigerant in the evaporator to the liquid storage tank;
when the temperature difference between the return air temperature and the inlet temperature is greater than or equal to a second preset temperature difference, controlling the electromagnetic valve to keep an opening state, and supplementing the refrigerant stored in the liquid storage tank to the compressor; or
The return air temperature with the difference in temperature of import temperature is greater than first predetermineeing the difference in temperature, just the difference in temperature is less than when the second predetermines the difference in temperature, close the solenoid valve.
7. The control method of an air conditioning system as claimed in claim 6, wherein when the air conditioning system is in a low temperature cooling mode and operates for a second preset time, the first temperature sensor re-detects the return air temperature of the compressor, and the second temperature sensor re-detects the inlet temperature of the evaporator, and calculates a second temperature difference between the re-detected return air temperature and the inlet temperature, the steps of:
when the second temperature difference is smaller than or equal to the first preset temperature difference, recovering excessive refrigerant in the evaporator to the liquid storage tank;
when the second temperature difference is greater than or equal to the second preset temperature difference, supplementing the refrigerant stored in the liquid storage tank to the compressor;
when the second temperature difference is greater than the first preset temperature difference, and the second temperature difference is less than the second preset temperature difference, the electromagnetic valve is closed.
8. The method of claim 7, wherein the step of detecting a return air temperature of the compressor by the first temperature sensor after the air conditioning system is in the low temperature cooling mode and operated for a first preset time, and detecting an inlet temperature of the evaporator by the second temperature sensor, further comprises:
acquiring an indoor environment temperature, and comparing the indoor environment temperature with a preset temperature;
when the indoor environment temperature is greater than or equal to the preset temperature, controlling the air conditioning system to start a common refrigeration mode;
and when the indoor environment temperature is lower than the preset temperature, controlling the air conditioning system to start a low-temperature refrigeration mode.
9. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a control program of an air conditioning system, which when executed by a processor, implements the steps of the control method of an air conditioning system according to any one of claims 6 to 8.
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| CN111637585B (en) * | 2020-05-07 | 2022-03-22 | 宁波奥克斯电气股份有限公司 | Refrigerant adjusting method and system used in air conditioner cooling or heating mode and air conditioner |
| CN114198954B (en) * | 2021-12-21 | 2023-09-15 | 宁波奥克斯电气股份有限公司 | Refrigerant recovery control method and device and refrigerant recovery unit |
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| EP3705800A3 (en) * | 2012-07-03 | 2020-12-23 | Samsung Electronics Co., Ltd. | Diagnosis control method for an air conditioner |
| CN102788403A (en) * | 2012-07-30 | 2012-11-21 | 广东美的电器股份有限公司 | Method for detecting lack of refrigerant in air conditioner, and air conditioner |
| CN104566846A (en) * | 2013-10-24 | 2015-04-29 | 广州南洋理工职业学院 | Fluorine shortage protection method for air conditioner |
| CN104807229A (en) * | 2015-04-27 | 2015-07-29 | 广东美的暖通设备有限公司 | Multi-split air conditioner and control method thereof |
| CN107178872A (en) * | 2017-05-18 | 2017-09-19 | 珠海格力电器股份有限公司 | A kind of refrigerant method of adjustment and device |
| CN207163035U (en) * | 2017-09-08 | 2018-03-30 | 浙江康利德科技有限公司 | A kind of gas-liquid separation device |
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