CN110849020A - Heat pump type air conditioner and control method thereof - Google Patents
Heat pump type air conditioner and control method thereof Download PDFInfo
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- CN110849020A CN110849020A CN201911171386.1A CN201911171386A CN110849020A CN 110849020 A CN110849020 A CN 110849020A CN 201911171386 A CN201911171386 A CN 201911171386A CN 110849020 A CN110849020 A CN 110849020A
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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
- 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
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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
- F24F11/88—Electrical aspects, e.g. circuits
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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
- F25B41/00—Fluid-circulation arrangements
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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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
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
Abstract
The invention discloses a heat pump type air conditioner and a control method thereof, and the heat pump type air conditioner comprises an indoor unit (100), an outdoor unit (200), a refrigerating system and a corresponding control circuit, wherein an electric heating element (1002) is matched with a cross flow fan (1001) on the indoor unit (100) for auxiliary heating, and the control circuit controls a heat pump and the electric heating element (1002) to work in a matched mode by collecting temperature change information of a temperature sensor RT1, a temperature sensor RT4, a temperature sensor RT3 and a temperature sensor RT 5. According to the heat pump type air conditioner and the control method thereof, the heat pump is controlled to be matched with the electric heating, the problems of power consumption, temperature reduction and discomfort caused by room temperature fluctuation due to frequent defrosting of the traditional air conditioner are solved, the room temperature is stabilized, the frosting probability of an outdoor heat exchanger of the air conditioner is reduced, and a better experience effect is brought to a user.
Description
Technical Field
The invention relates to the technical field of air conditioner control, in particular to a heat pump type air conditioner and a control method thereof.
Background
Because of objective natural law, the fins of outdoor heat exchangers of traditional heat pump air conditioners can frost inevitably in the heating process in winter, although industry practitioners continuously research the frosting mechanism of air conditioners and propose a plurality of defrosting control methods, for example: 1. an indoor coil temperature indirect judgment method, namely an indoor coil temperature change rate and a time method, is used for judging whether an outdoor heat exchanger is frosted, namely, the change rate of the indoor coil temperature is detected, and then time control is matched (namely, a minimum running time is determined, and frequent defrosting is prevented); 2. and a coil temperature sensor on the outdoor heat exchanger is used for judging the frosting condition of the outdoor heat exchanger. However, the two defrosting methods have applicable regions, climates and environments, have respective defects under certain environmental conditions, are difficult to adapt to all use environments, and have the situations of wrong defrosting and incomplete defrosting. The wrong defrosting brings the loss of heating capacity and the reduction of heating effect, and the defrosting brings larger hidden trouble. The lack of defrosting is directly related to the safe and reliable use of air conditioning products. When the surface of the condenser of the outdoor unit is frosted, the automatic defrosting function of the air conditioner cannot dissolve the frosted surface, or water remained on the surface of the heat exchanger is condensed into ice beads though the water is dissolved, and the ice beads are not dissolved in the next automatic defrosting period; over time, ice builds up and builds up thicker. At the moment, if the outdoor fan motor drives the fan blades to rotate to hit ice blocks, the fan blades are easy to break or the motor is easy to rotate, and the consequence is unimaginable (after the motor rotates, the current is increased, the temperature rise of the motor is continuously increased, and the situations of line-to-line short circuit, motor burnout and the like are easy to cause under the condition that no protection or protection measures are failed). Because the surface of the copper pipe of the heat exchanger of the outdoor unit of the air conditioner is frozen or frosted, the heat cannot be fully converted and absorbed, and the temperature of the pipe can be continuously reduced, the heating performance of the whole machine is greatly weakened, the load of a compressor is gradually increased at the moment, and the service life is influenced. The temperature blown out by the indoor unit gradually decreases, which also brings uncomfortable feeling to the user. However, the heat pump type air conditioner has wide range of people in China and various natural climates, and the problems are inevitable, so the heating comfort and the defrosting problem of the air conditioner are always a great problem which troubles the heat pump type air conditioner.
Based on the above, there is an urgent need for a heat pump type air conditioner and a control method thereof, which reduce the frosting probability of an outdoor heat exchanger of the air conditioner and bring better experience effect to users by controlling the heat pump and electric heating in cooperation.
Disclosure of Invention
The invention aims to solve the technical problem of providing a heat pump type air conditioner and a control method thereof, which reduce the frosting probability of an outdoor heat exchanger of the air conditioner by controlling a heat pump and electric heating and using the heat pump and the electric heating in a matched manner and bring better experience effect to users.
The invention adopts the following technical scheme to solve the technical problems:
a heat pump type air conditioner comprises an indoor unit, an outdoor unit, a refrigerating system and a corresponding control circuit; the indoor unit and the outdoor unit are respectively provided with a temperature sensor RT1 and a temperature sensor RT4 for acquiring the temperature change of indoor and outdoor environments, the coil pipes of the indoor unit and the outdoor unit are respectively provided with a temperature sensor RT3 and a temperature sensor RT5 for acquiring the temperature change of the heat exchanger coil pipe of the indoor unit and the heat exchanger coil pipe of the outdoor unit, and the refrigerating system comprises a compressor, a vapor-liquid separator, a four-way valve, a one-way valve, a stop valve, a first capillary tube, a second capillary tube and an electric heating element; the compressor is connected with a gas-liquid separator through a four-way valve and is sequentially communicated with an outdoor unit and an indoor unit through pipelines to form a circulation passage, stop valves are arranged in the connection passages at two sides of the outdoor unit and the indoor unit, first capillary tubes and one-way valves are sequentially arranged in passages at two ends of the outdoor unit and the indoor unit, which are opposite to one end of the compressor, the one-way valves are communicated with one ends of the first capillary tubes, second capillary tubes are connected in parallel outside the one-way valves, and the indoor unit and the outdoor unit are respectively and correspondingly matched with a cross flow fan and an axial flow fan; the electric heating element is matched with a cross-flow fan on the indoor unit and used for auxiliary heating, and the control circuit controls the heat pump and the electric heating element to work in a mutually matched mode through acquiring temperature change information of the temperature sensor RT1, the temperature sensor RT4, the temperature sensor RT3 and the temperature sensor RT 5.
The invention comprises a temperature sensor RT1, a temperature sensor RT4 and a first CPU, wherein the temperature sensor RT1, the temperature sensor RT4 and the first CPU are arranged on an indoor unit and a coil pipe of a heat exchanger of the indoor unit and are used for collecting the change of the environmental temperature of the indoor unit and the coil pipe of the indoor unit; the temperature sensor RT1 specifically comprises an NTC type thermistor RT1, an electrolytic capacitor EC1 and a protective resistor R1, the temperature sensor RT3 specifically comprises an NTC type thermistor RT3, an electrolytic capacitor EC3 and a protective resistor R3, the +5V voltage end of the first CPU is sequentially connected with the NTC type thermistor RT1 in series, the anode of the electrolytic capacitor EC1 is connected with the grounding end of the first CPU, and the protective resistor R1 is connected with two ends of the electrolytic capacitor EC1 in parallel; the +5V voltage end of the first CPU is also sequentially connected with an NTC type thermistor RT3 and the anode of an electrolytic capacitor EC3 in series, and is connected with the grounding end of the first CPU, the anode of the electrolytic capacitor EC1 and the anode of the electrolytic capacitor EC3 are both connected with the AD port of the first CPU, and the first CPU senses the change of the indoor environment and the temperature of a coil pipe of a heat exchanger of an indoor unit through the change of voltage and is used as a judgment basis for the temperature change of the indoor unit in the air conditioner rotating speed control process, so that the heat pump and the electric heating element are controlled to work in a matched mode.
The invention comprises a temperature sensor RT4, a temperature sensor RT5 and a second CPU, wherein the temperature sensor RT4, the temperature sensor RT5 and the second CPU are arranged on an outdoor unit and an outdoor unit heat exchanger coil and are used for collecting the environment temperature change on the outdoor unit and the outdoor unit coil; the temperature sensor RT4 specifically comprises an NTC type thermistor RT4, an electrolytic capacitor EC4 and a protective resistor R4, the temperature sensor RT5 specifically comprises an NTC type thermistor RT5, an electrolytic capacitor EC5 and a protective resistor R5, the +5V voltage end of the second CPU is sequentially connected with the NTC type thermistor RT1 in series, the anode of the electrolytic capacitor EC1 is connected with the grounding end of the second CPU, and the protective resistor R1 is connected with two ends of the electrolytic capacitor EC1 in parallel; the +5V voltage end of the second CPU is also sequentially connected with an NTC type thermistor RT3 and the anode of an electrolytic capacitor EC3 in series, the anode of the electrolytic capacitor EC1 and the anode of the electrolytic capacitor EC3 are connected with the grounding end of the second CPU, the second CPU senses the change of the outdoor environment and the temperature of the coil of the heat exchanger of the outdoor unit through the voltage change and is used as a judgment basis for the temperature change of the outdoor unit in the air conditioner rotating speed control process, and the heat pump and the electric heating element are controlled to work in a matched mode.
The invention also discloses a control method of the heat pump type air conditioner, which comprises the following steps:
s1: when the outdoor environment temperature is detected to be above the set TA1 temperature and the evaporation temperature is not below the air dew point, the fins are not frosted when the outdoor heat exchanger works for heating, and the heat pump system works independently at the moment, so that the energy efficiency is improved, and the energy is saved;
s2: when the outdoor environment temperature is detected to be below the set TA2 temperature, the absolute moisture content in the air is reduced, the fins are not likely to frost when the outdoor heat exchanger works in a heating mode, and the heat pump and the electric heating work together to improve the indoor temperature and the comfort.
As one of the preferred embodiments of the present invention, the method further includes the step S3: when the outdoor environment temperature is detected to be between TA1 and TA2, the fins of the heating outdoor heat exchanger are prone to frosting, the heat pump works firstly, when the working time of the heat pump is longer than the set time t1, the temperature difference between the outdoor environment temperature and the temperature of the coil of the outdoor heat exchanger reaches the set temperature difference TC1, the heat pump stops working and works by replacing electric heating, and discomfort caused by temperature drop due to frosting and room temperature fluctuation caused by defrosting are reduced.
As one of the preferable modes of the invention, the method further comprises a step S4, when the air conditioner is detected to start heating, firstly, determining whether the outdoor environment temperature is lower than the set temperature TA3 and whether the temperature difference between the outdoor environment temperature and the outdoor heat exchanger coil temperature reaches the set temperature TC2, if yes, performing a defrosting operation once to improve the effect during normal heating operation.
Compared with the prior art, the invention has the advantages that: according to the heat pump type air conditioner and the control method thereof, the heat pump is controlled to be matched with electric heating, the problems of power consumption, temperature drop and discomfort caused by room temperature fluctuation due to frequent defrosting of the traditional air conditioner are solved, the room temperature is stabilized, the frosting probability of an outdoor heat exchanger of the air conditioner is reduced, and a better experience effect is brought to a user.
Drawings
FIG. 1 is a functional diagram of a fixed-frequency air conditioner in an embodiment;
FIG. 2 is a first control circuit of the fixed-frequency air conditioner in the embodiment;
FIG. 3 is a second control circuit of the constant frequency air conditioner in the embodiment;
FIG. 4 is a main flow chart of a specific control method of an air conditioner in an embodiment;
fig. 5 is a flow chart of an air-conditioning heating operation in the embodiment.
Detailed Description
The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
Example 1
As shown in fig. 1, a heat pump type air conditioner of the present embodiment includes an indoor unit 100, an outdoor unit 200, a refrigeration system and a corresponding control circuit; the indoor unit 100 and the outdoor unit 200 are respectively provided with a temperature sensor RT1 and a temperature sensor RT4 for acquiring the temperature change of indoor and outdoor environments, the coil pipes of the indoor unit and the outdoor unit are respectively provided with a temperature sensor RT3 and a temperature sensor RT5 for acquiring the temperature change of the heat exchanger coil pipe of the indoor unit and the heat exchanger coil pipe of the outdoor unit, and the refrigeration system comprises a compressor 300, a vapor-liquid separator 400, a four-way valve 500, a one-way valve 600, a stop valve 700, a first capillary tube 800, a second capillary tube 801 and an electric heating element 1002; the compressor 300 is connected with the gas-liquid separator 400 through the four-way valve 500 and is sequentially communicated with the outdoor unit 200 and the indoor unit 100 through pipelines to form a circulation passage, stop valves 700 are arranged in the connection passages at two sides of the outdoor unit 200 and the indoor unit 100, a first capillary tube 800 and a one-way valve 600 are sequentially arranged in a passage at one end of the two sides of the outdoor unit 200 and the indoor unit 100 opposite to the compressor 300, the one-way valve 600 is communicated with one end of the first capillary tube 800, a second capillary tube 801 is connected in parallel outside the one-way valve 600, and the indoor unit 100 and the outdoor unit 200 are respectively matched with a cross-flow fan 1001 and an axial-flow fan 2001; the electric heating element 1002 is matched with a cross flow fan 1001 on the indoor unit 100 to be used for auxiliary heating, and the control circuit controls the heat pump and the electric heating element 1002 to mutually cooperate by acquiring temperature change information of a temperature sensor RT1, a temperature sensor RT4, a temperature sensor RT3 and a temperature sensor RT 5; the first capillary 800 and the second capillary 801 of the present embodiment may also be replaced with other throttling devices, such as: self-excited expansion valves, thermostatic expansion valves, electronic expansion valves, etc.
It should be noted that the present embodiment is composed of an indoor unit, an outdoor unit, a refrigeration system and a corresponding control circuit; during refrigeration, low-pressure and low-temperature refrigerant vapor in the refrigeration system is sucked by the compressor, and is compressed into high-pressure and high-temperature superheated vapor which is then discharged to the heat exchanger of the outdoor unit; meanwhile, outdoor air sucked by the outdoor fan flows through the outdoor heat exchanger to take away heat emitted by the refrigerant, so that high-pressure and high-temperature refrigerant vapor is condensed into high-pressure liquid. High-pressure liquid flows into an indoor machine heat exchanger through a throttling capillary tube for pressure reduction and temperature reduction, and is evaporated under corresponding low pressure to absorb ambient heat; meanwhile, the indoor side fan enables indoor air to continuously enter fins of the indoor machine heat exchanger for heat exchange, and sends the cooled air after heat release to the indoor. Therefore, the indoor air and the outdoor air continuously flow circularly to achieve the aim of reducing the temperature. When heating, the heat of compression and condensation of the refrigerating system is utilized to heat the indoor air, the low-pressure and low-temperature refrigerant liquid is evaporated and absorbs heat in the evaporator, and the high-temperature and high-pressure refrigerant gas is released and condensed in the condenser. When the heat pump heats, the circulation direction of the refrigerant is changed through the four-way valve, so that an indoor machine heat exchanger serving as an evaporator during the original refrigeration work is changed into a condenser during heating, and an outdoor machine heat exchanger serving as a condenser during the original refrigeration work is changed into an evaporator during heating, therefore, a refrigeration system absorbs heat outdoors and releases heat indoors, the purpose of heating is realized, an electric heating element is matched with a cross-flow fan on the indoor machine for auxiliary heating, and the four-way valve specifically comprises the following steps: the control circuit controls the heat pump and the electric heating element 1002 to work in a matched mode by acquiring temperature change information of the temperature sensor RT1, the temperature sensor RT4, the temperature sensor RT3 and the temperature sensor RT 5.
Referring to fig. 2: the temperature sensor RT1, the temperature sensor RT4 and the first CPU are arranged on the indoor unit and the coil pipe of the heat exchanger of the indoor unit and are used for collecting the change of the indoor and indoor environment temperature on the coil pipe of the indoor unit; the temperature sensor RT1 specifically comprises an NTC type thermistor RT1, an electrolytic capacitor EC1 and a protective resistor R1, the temperature sensor RT3 specifically comprises an NTC type thermistor RT3, an electrolytic capacitor EC3 and a protective resistor R3, the +5V voltage end of the first CPU is sequentially connected with the NTC type thermistor RT1 in series, the anode of the electrolytic capacitor EC1 is connected with the grounding end of the first CPU, and the protective resistor R1 is connected with two ends of the electrolytic capacitor EC1 in parallel; the +5V voltage end of the first CPU is also sequentially connected with an NTC type thermistor RT3 and the anode of an electrolytic capacitor EC3 in series, and is connected with the grounding end of the first CPU, the anode of the electrolytic capacitor EC1 and the anode of the electrolytic capacitor EC3 are both connected with the AD port of the first CPU, and the first CPU senses the change of the indoor environment and the coil temperature of an indoor unit heat exchanger through the change of voltage and is used as a judgment basis for the temperature change of the indoor unit in the air conditioner rotating speed control process, so that the heat pump and the electric heating element 1002 are controlled to work in a mutual matching mode.
It can be understood that, the indoor environment and coil temperature acquisition circuit divides the voltage of 5V by the NTC thermistor RT1 and R1 through the coil temperature sensor on the indoor unit environment and the heat exchanger, and EC1 shapes and stabilizes the voltage; RT3 and R3 divide voltage, EC3 shapes and stabilizes voltage, changes of resistance values of the NTC thermistors RT1 and RT3 are converted into voltage changes, and direct current voltage signals are output to an AD port of the CPU. The CPU senses the change of the indoor environment and the temperature of the coil pipe of the heat exchanger through AD conversion and collection of the voltage, and therefore the voltage is used as a judgment basis for the temperature change of the indoor unit in the air conditioner rotating speed control process. Wherein the indoor ambient temperature is set to be T1 and the indoor coil temperature is set to be T3.
Referring to fig. 3, the temperature sensor RT4, the temperature sensor RT5 and the second CPU are arranged on the outdoor unit and the outdoor unit heat exchanger coil pipe and used for collecting the environment temperature change on the outdoor unit and the outdoor unit coil pipe; the temperature sensor RT4 specifically comprises an NTC type thermistor RT4, an electrolytic capacitor EC4 and a protective resistor R4, the temperature sensor RT5 specifically comprises an NTC type thermistor RT5, an electrolytic capacitor EC5 and a protective resistor R5, the +5V voltage end of the second CPU is sequentially connected with the NTC type thermistor RT1 in series, the anode of the electrolytic capacitor EC1 is connected with the grounding end of the second CPU, and the protective resistor R1 is connected with two ends of the electrolytic capacitor EC1 in parallel; the +5V voltage end of the second CPU is also sequentially connected with an NTC type thermistor RT3 and the anode of an electrolytic capacitor EC3 in series, the anode of the electrolytic capacitor EC1 and the anode of the electrolytic capacitor EC3 are connected with the grounding end of the second CPU, the second CPU senses the change of the outdoor environment and the temperature of a coil of an outdoor unit heat exchanger through the change of voltage, and the change is used as a judgment basis for the temperature change of the outdoor unit in the air conditioner rotating speed control process, so that the heat pump and the electric heating element 1002 are controlled to work in a matched mode.
It can be understood that, the outdoor environment and the coil temperature acquisition circuit are respectively connected with the coil temperature sensor in the outdoor environment and the heat exchanger, 5V voltage is divided by NTC thermistors RT4 and R4, and EC4 shapes and stabilizes the voltage; RT5 and R5 divide voltage, EC5 shapes and stabilizes voltage, changes of resistance values of the NTC thermistors RT4 and RT5 are converted into voltage changes, and direct current voltage signals are output to an AD port of the CPU. The CPU senses the outdoor environment and the temperature change of the coil pipe of the heat exchanger through AD conversion and collection of the voltage, and therefore the voltage is used as a judgment basis for the temperature change of the outdoor unit in the air conditioner rotating speed control process. Wherein the outdoor coil temperature is set to be T4 and the outdoor ambient temperature is set to be T5.
Example 2
The embodiment also discloses a control method of the heat pump type air conditioner, which comprises the following steps:
s1: when the outdoor environment temperature is detected to be above the set TA1 temperature and the evaporation temperature is not below the air dew point, the fins are not frosted when the outdoor heat exchanger works for heating, and the heat pump system works independently at the moment, so that the energy efficiency is improved, and the energy is saved;
s2: when the outdoor environment temperature is detected to be below the set TA2 temperature, the absolute moisture content in the air is reduced, the fins are not likely to frost when the outdoor heat exchanger works in a heating mode, and the heat pump and the electric heating work together to improve the indoor temperature and the comfort.
S3: when the outdoor environment temperature is detected to be between TA1 and TA2, the fins of the heating outdoor heat exchanger are prone to frosting, the heat pump works firstly, when the working time of the heat pump is longer than the set time t1, the temperature difference between the outdoor environment temperature and the temperature of the coil pipe of the outdoor heat exchanger reaches the set temperature difference TC1, the heat pump stops working and replaces working by electric heating, and discomfort caused by temperature drop caused by frosting and room temperature fluctuation caused by defrosting are reduced;
s4, when detecting the air conditioner starts to heat, firstly judging whether the outdoor environment temperature is lower than the set temperature TA3 and whether the temperature difference between the outdoor environment temperature and the outdoor heat exchanger coil temperature reaches the set temperature TC2, if yes, defrosting once, and improving the effect of normal heating work.
The specific operation implementation process of the heat pump type air conditioner control method is as follows:
the air conditioner is powered on, the process starts, and referring to fig. 4, it is first determined (1) whether the air conditioner is powered on, and if the determination result is yes, it is determined (6) whether the mode of the air conditioner is the auto mode? If the mode is the automatic mode, judging (7) is executed; if the result of the judgment (6) is not yes, executing the judgment (8); determine (6) if T1 is less than W? If the judgment result is negative, entering other air conditioner working modes except heating; if the result is yes, executing a judgment (9), judging whether the result of the judgment (9) is to enter A, and if the result of the judgment (9) is yes, executing the action of stopping the compressor and then entering A; determine (8) whether heating mode? Executing a judgment (9), judging whether the result of the judgment (9) is to enter A, and if the result of the judgment (9) is to be yes, executing the action of stopping the compressor and then entering A; if the air conditioner is not in the other air conditioner working mode except heating.
If the result of the judgment (1) is negative, executing a judgment (2) to judge whether T5 is smaller than TA3, and if the result is negative, ending the flow; if the result of the judgment (2) is yes, a judgment (3) is performed to judge whether Δ T is smaller than TC 2? If yes, the process is ended, if no, the compressor is started, the defrosting flag is set, and in the process of starting compression, whether (4) T4 is greater than TP1 is determined? If the judgment result is yes, stopping the compressor, clearing the defrosting mark, if the judgment result is no, executing the judgment (5), judging whether the starting signal is received by the judgment (5), if the judgment result is no, continuing to start the compressor for defrosting, and if the judgment result is yes, starting to execute the judgment (6);
entering a, as shown in the heating operation flowchart of fig. 5, first, it is determined (10) whether T1 is greater than or equal to TS? If the judgment result is yes, the heating stops working, and the process is ended; if the result is yes, a decision (11) is made. Determine (11) whether or not T5 is equal to or greater than TA 1? If the judgment result is yes, the heat pump is started to heat, the electric heating is closed, and the process is ended; if the result is not yes, executing judgment (12); determine (12) if T5 is less than TA 2? If the judgment result is that the heat pump heating operation is started; then, the judgment (13) is made to judge (13) whether T3 is smaller than TP 2? If the judgment result is negative, the process is ended; if yes, a decision (14) is made to determine (14) whether the electric heating stop time is greater than t 2? If the judgment result is negative, the process is ended, and if the judgment result is positive, the electric heating starts to work, the electric heating permission flag is set to be 1, and the electric heating stop time is cleared. Then, a judgment (15) is performed, and a judgment (15) is made as to whether or not T3 is equal to or greater than TP 3? If the judgment result is yes, the electric heating is stopped, the electric heating operation permission sign is displayed, the electric heating stop time timing is started, if the judgment result is no, the judgment (16) is executed, and whether the electric heating operation is permitted or not is judged (16)? If the result is yes, the electric heating continues to work; if the result of the judgment (12) is no, the heat pump starts to operate, then the judgment (17) is executed, and whether the working time of the heat pump is more than t3 is judged (17)? If the result is negative, continuing heating of the heat pump, and if the result of the judgment (17) is positive, executing a judgment (18); determine (18) whether Δ T is equal to or greater than TC 1? If the judgment result is negative, continuing the heat pump heating; if the judgment result is yes, the heat pump stops running, the operation is switched to electric heating operation, and the process is ended.
The following table is a table of values of some of the parameters in the examples:
the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (6)
1. A heat pump type air conditioner is characterized by comprising an indoor unit (100), an outdoor unit (200), a refrigerating system and a corresponding control circuit; the indoor unit (100) and the outdoor unit (200) are respectively provided with a temperature sensor RT1 and a temperature sensor RT4 for acquiring the temperature change of indoor and outdoor environments, the coil pipes of the indoor unit and the outdoor unit are respectively provided with a temperature sensor RT3 and a temperature sensor RT5 for acquiring the temperature change of the heat exchanger coil pipe of the indoor unit and the heat exchanger coil pipe of the outdoor unit, and the refrigeration system comprises a compressor (300), a gas-liquid separator (400), a four-way valve (500), a one-way valve (600), a stop valve (700), a first capillary tube (800), a second capillary tube (801) and an electric heating element (1002); the compressor (300) is connected with the gas-liquid separator (400) through a four-way valve (500) and is sequentially communicated with the outdoor unit (200) and the indoor unit (100) through pipelines to form a circulation passage, stop valves (700) are arranged in connecting passages at two sides of the outdoor unit (200) and the indoor unit (100), a first capillary tube (800) and a one-way valve (600) are sequentially arranged in a passage at one end, opposite to the compressor (300), of two sides of the outdoor unit (200) and the indoor unit (100), the one end, communicated with the first capillary tube (800), of the one-way valve (600) is communicated, a second capillary tube (801) is further connected in parallel outside the one-way valve (600), and the indoor unit (100) and the outdoor unit (200) are respectively and correspondingly matched with a cross-flow fan; electric heating element (1002) cooperate with cross-flow fan (1001) on indoor set (100) and be used for the auxiliary heating, control circuit controls heat pump and electric heating element (1002) and carries out mutual cooperation work through the temperature change information control heat pump of gathering temperature sensor RT1, temperature sensor RT4, temperature sensor RT3, temperature sensor RT 5.
2. A heat pump type air conditioner according to claim 1, comprising a temperature sensor RT1, a temperature sensor RT4 and a first CPU arranged on the indoor unit and the indoor unit heat exchanger coil for collecting the ambient temperature variation in the indoor and indoor unit coils; the temperature sensor RT1 specifically comprises an NTC type thermistor RT1, an electrolytic capacitor EC1 and a protective resistor R1, the temperature sensor RT3 specifically comprises an NTC type thermistor RT3, an electrolytic capacitor EC3 and a protective resistor R3, the +5V voltage end of the first CPU is sequentially connected with the NTC type thermistor RT1 in series and the anode of the electrolytic capacitor EC1 in series and is connected with the grounding end of the first CPU, and the protective resistor R1 is connected with two ends of the electrolytic capacitor EC1 in parallel; the +5V voltage end of the first CPU is also sequentially connected with an NTC type thermistor RT3 and the anode of an electrolytic capacitor EC3 in series, and is connected with the grounding end of the first CPU, the anode of the electrolytic capacitor EC1 and the anode of the electrolytic capacitor EC3 are both connected with the AD port of the first CPU, and the first CPU senses the change of the indoor environment and the temperature of the coil pipe of the heat exchanger of the indoor unit through the voltage change and is used as a judgment basis for the temperature change of the indoor unit in the air conditioner rotating speed control process, so that the heat pump and the electric heating element (1002) are controlled to work in a mutual matching mode.
3. A heat pump type air conditioner according to claim 1, comprising a temperature sensor RT4, a temperature sensor RT5 and a second CPU installed on the outdoor unit and the outdoor unit heat exchanger coil for collecting the ambient temperature variation of the outdoor unit and the outdoor unit coil; the temperature sensor RT4 specifically comprises an NTC type thermistor RT4, an electrolytic capacitor EC4 and a protective resistor R4, the temperature sensor RT5 specifically comprises an NTC type thermistor RT5, an electrolytic capacitor EC5 and a protective resistor R5, the +5V voltage end of the second CPU is sequentially connected with the NTC type thermistor RT1 in series, the anode of the electrolytic capacitor EC1 is connected with the grounding end of the second CPU, and the protective resistor R1 is connected with two ends of the electrolytic capacitor EC1 in parallel; the +5V voltage end of the second CPU is also sequentially connected with an NTC type thermistor RT3 and the anode of an electrolytic capacitor EC3 in series, the anode of the electrolytic capacitor EC1 and the anode of the electrolytic capacitor EC3 are connected with the grounding end of the second CPU, the second CPU senses the outdoor environment and the temperature change of the coil of the heat exchanger of the outdoor unit through the voltage change and is used as a judgment basis for the temperature change of the outdoor unit in the air conditioner rotating speed control process, and the heat pump and the electric heating element (1002) are controlled to work in a matched mode.
4. A control method of a heat pump type air conditioner is characterized by comprising the following steps:
s1: when the outdoor environment temperature is detected to be above the set TA1 temperature and the evaporation temperature is not below the air dew point, the fins are not frosted when the outdoor heat exchanger works for heating, and the heat pump system works alone at the moment;
s2: when the outdoor environment temperature is detected to be below the set TA2 temperature, the absolute moisture content in the air is reduced, and the outdoor heat exchanger works together with the heat pump and the electric heating when in heating operation.
5. A heat pump type air conditioner controlling method according to claim 4, further comprising the step of process S3: when the outdoor environment temperature is detected to be between TA1 and TA2, the fins of the heating outdoor heat exchanger are easy to frost, the heat pump works firstly, when the working time of the heat pump meets the set time t1, the temperature difference between the outdoor environment temperature and the temperature of the coil pipe of the outdoor heat exchanger reaches the set temperature difference TC1, the heat pump stops working, and the electric heating is used for replacing the working.
6. A control method of a heat pump type air conditioner according to claim 4, further comprising a step S4 of, when the air conditioner is detected to be turned on for heating, firstly determining whether the outdoor environment temperature is lower than a set temperature TA3 and whether the temperature difference between the outdoor environment temperature and the outdoor heat exchanger coil temperature reaches a set temperature TC2, and if both are determined yes, performing a defrosting.
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| CN201911171386.1A CN110849020A (en) | 2019-11-26 | 2019-11-26 | Heat pump type air conditioner and control method thereof |
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| CN201911171386.1A CN110849020A (en) | 2019-11-26 | 2019-11-26 | Heat pump type air conditioner and control method thereof |
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| CN113865033A (en) * | 2021-10-09 | 2021-12-31 | 广东欧科空调制冷有限公司 | Control method and device for high-precision direct-expansion heat pump air conditioner |
| CN114791123A (en) * | 2022-05-05 | 2022-07-26 | 安徽扬子空调股份有限公司 | Control method for defrosting and inhibiting frost of heat pump type air conditioner |
| 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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