CN111473475A - Energy-saving air conditioner circulating system with automatic defrosting function and control method - Google Patents

Energy-saving air conditioner circulating system with automatic defrosting function and control method Download PDF

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Publication number
CN111473475A
CN111473475A CN202010474484.9A CN202010474484A CN111473475A CN 111473475 A CN111473475 A CN 111473475A CN 202010474484 A CN202010474484 A CN 202010474484A CN 111473475 A CN111473475 A CN 111473475A
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valve
condenser
controller
temperature sensor
electromagnetic valve
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刘兵兵
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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/10—Pressure
    • F24F2140/12—Heat-exchange fluid pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature

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

Abstract

The invention discloses an energy-saving air conditioner circulating system with an automatic defrosting function and a control method, wherein the energy-saving air conditioner circulating system with the automatic defrosting function comprises a compressor, a four-way valve, a condenser, an evaporator, a throttle valve, an electromagnetic valve, an electrically operated valve, a temperature sensor and a pressure sensor; the number of the condensers is 2, and the compressor, the four-way valve, the first electromagnetic valve, the second electromagnetic valve, the first electric valve, the second electric valve, the indoor temperature sensor, the first temperature sensor, the second temperature sensor, the first pressure sensor and the second pressure sensor are respectively and electrically connected with the controller. The control method comprises a refrigeration control method and a heating control method. The invention adopts a double-condenser design structure, has the advantages of reasonable structural design and easy manufacture, can realize air conditioner defrosting in winter without the problem that an indoor unit blows cold air when the air conditioner is used in winter, and solves the problems of reverse circulation of an evaporator and too large cold and hot temperature difference and easy damage when the air conditioner is defrosted in winter.

Description

Energy-saving air conditioner circulating system with automatic defrosting function and control method
Technical Field
The invention relates to the technical field of air conditioners and control thereof, in particular to an energy-saving air conditioner circulating system with an automatic defrosting function and a control method.
Background
At present, when the air conditioner in the prior art defrosts, a four-way valve is mostly adopted to change the loop direction, so that an evaporator at the indoor side is changed into a condenser, and the defrosting effect can be achieved by considering the exchange mode of an internal machine and an external machine. This approach has the following drawbacks: 1. the outdoor machine emits hot air; 2. the indoor unit stops blowing hot air; 3. the heat exchanger in the indoor unit is frosted, and the phenomenon of blowing cold air sometimes occurs; 4. the indoor unit generates clicking sound (large temperature difference of cold-heat conversion, expansion with heat and contraction with cold); 5. shortening the service life of the evaporator.
Disclosure of Invention
The invention aims to provide an energy-saving air conditioner circulating system with an automatic defrosting function and a control method thereof aiming at the defects in the prior art.
The technical scheme is as follows: an energy-saving air conditioner circulating system with an automatic defrosting function comprises a compressor, a four-way valve, a condenser, an evaporator, a throttle valve, an electromagnetic valve, an electric valve, a temperature sensor and a pressure sensor, wherein an exhaust port of the compressor is connected with the D end of the four-way valve, an air suction port of the compressor is connected with the S end of the four-way valve, one side of the evaporator is provided with the indoor temperature sensor, the E end of the four-way valve is connected with one end of a first electromagnetic valve, one end of a second electromagnetic valve and the left end of the evaporator, the right end of the evaporator is connected with one end of a first throttle valve and one end of a second throttle valve, the other end of the first throttle valve is connected with one end of a third throttle valve and the right end of the first condenser, the other end of the second throttle valve is connected with the other end of the third throttle valve and the right end of the second condenser, the left end of the first, the end C of the four-way valve is connected with the other end of the first electric valve and the other end of the second electric valve; the connections are all pipeline connections; a first temperature sensor is arranged on the right pipeline of the first condenser, and a second temperature sensor is arranged on the right pipeline of the second condenser; a first pressure sensor is arranged on the left end pipeline of the first condenser, and a second pressure sensor is arranged on the left end pipeline of the second condenser; the compressor, the four-way valve, the first electromagnetic valve, the second electromagnetic valve, the indoor temperature sensor, the first temperature sensor, the second temperature sensor, the first pressure sensor and the second pressure sensor are respectively and electrically connected with the controller.
The controller is a programmable controller with a display touch screen.
The first condenser and the second condenser are equal in size.
The first throttle valve, the second throttle valve and the third throttle valve are all bidirectional adjustable throttle valves.
The control method of the energy-saving air conditioner circulating system with the automatic defrosting function comprises refrigeration control and heating control;
the refrigeration control is as follows: the controller passes through indoor temperature sensor monitoring room temperature, and when the temperature was higher than the setting value, the drive compressor operation controlled the D → C both ends and the S → E both ends of cross valve and switched on, and the controller control first solenoid valve, second solenoid valve and second motorised valve close, first motorised valve opens, entire system gets into the refrigeration operation, and its circulation route is:
Figure 127407DEST_PATH_IMAGE002
the heating control is as follows: the controller monitors the indoor temperature through an indoor temperature sensor, when the temperature is lower than a set value, the compressor is driven to run and the S → C two ends and the D → E two ends of the four-way valve are controlled to be conducted, the controller controls the first electromagnetic valve, the second electromagnetic valve and the second electric valve to be closed and the first electric valve to be opened, the whole system enters the heating operation, and the circulation path is as follows:
Figure 106865DEST_PATH_IMAGE004
when the first condenser needs defrosting, the first pressure sensor monitors the pressure reduction and transmits a pressure signal to the controller, the controller controls to rapidly close the first electric valve, slowly open the second electric valve and open the first electromagnetic valve, and the circulation path at the moment is as follows:
Figure 465032DEST_PATH_IMAGE006
due to the participation of the evaporator and the second throttling valve branch, the circulation path is defrosted by the first condenser without stopping indoor heating operation; the first temperature sensor is used for monitoring the temperature of the first condenser during defrosting and sending the temperature signal to the controller, the defrosting operation of the first condenser can be finished quickly because the high temperature output by the compressor directly enters the first condenser, the controller controls the first electromagnetic valve to be closed and the second electromagnetic valve to be opened completely, and the circulation path at the moment is as follows:
Figure 922558DEST_PATH_IMAGE008
when the second condenser needs defrosting, the second pressure sensor can monitor the pressure reduction and transmit the pressure signal to the controller, the controller controls to quickly close the second electric valve, slowly open the first electric valve and open the second electric valve, and the circulation path at the moment is as follows:
Figure 861564DEST_PATH_IMAGE010
due to the participation of the evaporator and the first throttling valve branch, the circulation path is defrosted by the second condenser without stopping indoor heating operation; the second temperature sensor is used for monitoring the temperature of the second condenser during defrosting and sending the temperature signal to the controller, because the high temperature output by the compressor directly enters the second condenser, the defrosting operation of the second condenser can be finished quickly, the controller controls to close the second electromagnetic valve and completely open the first electric valve, and the circulation path at the moment is as follows:
Figure 247808DEST_PATH_IMAGE012
returning to use the first condenser;
the above processes are circularly carried out in the heating process.
Compared with the prior art, the invention adopts a double-condenser design structure, and has the following advantages: the air conditioner has reasonable structural design and easy manufacture, and can realize defrosting of the air conditioner in winter without the problems of cold air blowing and hot air blowing of an indoor unit when the air conditioner is used in winter; the four-way valve is not used for refrigerating and heating conversion in the whole heating process, so that the phenomenon that pipelines are easy to damage due to severe pressure and temperature changes is reduced; the idle work of the compressor when the evaporator and the condenser do not act on defrosting from low pressure to high pressure is reduced, so that the energy efficiency ratio of the whole air conditioner is improved.
Drawings
FIG. 1 is a schematic structural diagram of one embodiment of the present invention;
FIG. 2 is a block circuit diagram of one embodiment of the present invention.
Detailed Description
Referring to the attached fig. 1-2, the energy-saving air conditioner circulation system with automatic defrosting function and the control method thereof, the energy-saving air conditioner circulation system with automatic defrosting function comprises a compressor, a four-way valve, a condenser, an evaporator, a throttle valve, an electromagnetic valve, an electrically operated valve, a temperature sensor and a pressure sensor, an exhaust port of the compressor 1 is connected with a D end of the four-way valve 2, an air suction port of the compressor 1 is connected with an S end of the four-way valve 2, one side of the evaporator 3 is provided with an indoor temperature sensor 17, an E end of the four-way valve 2 is connected with one end of a first electromagnetic valve 13, one end of a second electromagnetic valve 14 and a left end of the evaporator 3, a right end of the evaporator 3 is connected with one end of a first throttle valve 4 and one end of a second throttle valve 5, the other end of the first throttle valve 4 is connected with one end of a third throttle, the left end of the first condenser 7 is connected with the other end of a first electromagnetic valve 13 and one end of a first electric valve 11, the left end of the second condenser 8 is connected with the other end of a second electromagnetic valve 14 and one end of a second electric valve 12, and the C end of the four-way valve 2 is connected with the other end of the first electric valve 11 and the other end of the second electric valve 12; the connections are all pipeline connections; a first temperature sensor 10 is arranged on a pipeline at the right end of the first condenser 7, and a second temperature sensor 16 is arranged on a pipeline at the right end of the second condenser 8; a first pressure sensor 9 is arranged on a left end pipeline of the first condenser 7, and a second pressure sensor 15 is arranged on a left end pipeline of the second condenser 8; the compressor 1, the four-way valve 2, the first solenoid valve 13, the second solenoid valve 14, the first solenoid valve 11, the second solenoid valve 12, the indoor temperature sensor 17, the first temperature sensor 10, the second temperature sensor 16, the first pressure sensor 9 and the second pressure sensor 15 are electrically connected with a controller 20 respectively. The controller 20 is a programmable controller with a display touch screen 201. The first condenser 7 and the second condenser 8 are equal in size. The first throttle valve 4, the second throttle valve 5 and the third throttle valve 6 are all bidirectional adjustable throttle valves.
The control method of the energy-saving air conditioner circulating system with the automatic defrosting function comprises refrigeration control and heating control;
the refrigeration control is as follows: the controller passes through indoor temperature sensor monitoring room temperature, and when the temperature was higher than the setting value, the drive compressor operation controlled the D → C both ends and the S → E both ends of cross valve and switched on, and the controller control first solenoid valve, second solenoid valve and second motorised valve close, first motorised valve opens, entire system gets into the refrigeration operation, and its circulation route is:
Figure 577159DEST_PATH_IMAGE013
the heating control is as follows: the controller monitors the indoor temperature through an indoor temperature sensor, when the temperature is lower than a set value, the compressor is driven to run and the S → C two ends and the D → E two ends of the four-way valve are controlled to be conducted, the controller controls the first electromagnetic valve, the second electromagnetic valve and the second electric valve to be closed and the first electric valve to be opened, the whole system enters the heating operation, and the circulation path is as follows:
Figure DEST_PATH_IMAGE014
when the first condenser needs defrosting, the first pressure sensor monitors the pressure reduction and transmits a pressure signal to the controller, the controller controls to rapidly close the first electric valve, slowly open the second electric valve and open the first electromagnetic valve, and the circulation path at the moment is as follows:
Figure DEST_PATH_IMAGE015
due to the participation of the evaporator and the second throttling valve branch, the circulation path is defrosted by the first condenser without stopping indoor heating operation; the first temperature sensor is used for monitoring the temperature of the first condenser during defrosting and sending the temperature signal to the controller, the defrosting operation of the first condenser can be finished quickly because the high temperature output by the compressor directly enters the first condenser, the controller controls the first electromagnetic valve to be closed and the second electromagnetic valve to be opened completely, and the circulation path at the moment is as follows:
Figure DEST_PATH_IMAGE016
when the second condenser needs defrosting, the second pressure sensor can monitor the pressure reduction and transmit the pressure signal to the controller, the controller controls to quickly close the second electric valve, slowly open the first electric valve and open the second electric valve, and the circulation path at the moment is as follows:
Figure DEST_PATH_IMAGE018
due to the participation of the evaporator and the first throttling valve branch, the circulation path is defrosted by the second condenser without stopping indoor heating operation; the second temperature sensor is used for monitoring the temperature of the second condenser during defrosting and sending the temperature signal to the controller, because the high temperature output by the compressor directly enters the second condenser, the defrosting operation of the second condenser can be finished quickly, the controller controls to close the second electromagnetic valve and completely open the first electric valve, and the circulation path at the moment is as follows:
Figure DEST_PATH_IMAGE019
returning to use the first condenser;
the circulation in the heating process is repeated and alternated and automatically carried out.
Taking refrigerant R22 as an example: when the outdoor temperature is minus 10 ℃, the pressure monitored by the first pressure sensor and the second pressure sensor is the evaporation pressure of the air conditioner (the heating state of the air conditioner-the condenser is changed into the evaporator), generally about 0.32Mpa, and if the pressure detected by the pressure sensors is lower than the condensation pressure 1/3-1/2, defrosting is required. And when the temperatures monitored by the first temperature sensor and the second temperature sensor are 5-15 ℃, the defrosting of the condenser is finished.
In the heating process, the slow opening of the first or second electric valve (reducing the impact of the drastic pressure change on the pipeline) means that the time from the initial opening to the complete opening of the electric valve is 1-3 minutes, and the time is controlled by the controller 20; the controller 20 is a mature product in the prior art, and the working principle thereof is not described herein.
The invention adopts a double-condenser design structure and has the following advantages: the air conditioner has reasonable structural design and easy manufacture, and can realize defrosting of the air conditioner in winter without the problems of cold air blowing and hot air blowing of an indoor unit when the air conditioner is used in winter; the four-way valve is not used for refrigerating and heating conversion in the whole heating process, so that the phenomenon that pipelines are easy to damage due to severe pressure and temperature changes is reduced; the idle work of the compressor when the evaporator and the condenser do not act on defrosting from low pressure to high pressure is reduced, so that the energy efficiency ratio of the whole air conditioner is improved.

Claims (5)

1. Energy-saving air conditioner circulation system with automatic defrosting function, including compressor, cross valve, condenser, evaporimeter, choke valve, solenoid valve, motorised valve, temperature sensor and pressure sensor, the D end of cross valve is connected to the compressor gas vent, and the S end of cross valve is connected to the compressor induction port, and evaporimeter one side is equipped with indoor temperature sensor, its characterized in that: the E end of the four-way valve is connected with one end of a first electromagnetic valve, one end of a second electromagnetic valve and the left end of an evaporator, the right end of the evaporator is connected with one end of a first throttle valve and one end of a second throttle valve, the other end of the first throttle valve is connected with one end of a third throttle valve and the right end of a first condenser, the other end of the second throttle valve is connected with the other end of the third throttle valve and the right end of a second condenser, the left end of the first condenser is connected with the other end of the first electromagnetic valve and one end of a first electric valve, the left end of the second condenser is connected with the other end of the second electromagnetic valve and one end of a second electric valve, and the C end of the four-way valve is connected with the other end; the connections are all pipeline connections; a first temperature sensor is arranged on the right pipeline of the first condenser, and a second temperature sensor is arranged on the right pipeline of the second condenser; a first pressure sensor is arranged on the left end pipeline of the first condenser, and a second pressure sensor is arranged on the left end pipeline of the second condenser; the compressor, the four-way valve, the first electromagnetic valve, the second electromagnetic valve, the indoor temperature sensor, the first temperature sensor, the second temperature sensor, the first pressure sensor and the second pressure sensor are respectively and electrically connected with the controller.
2. The energy saving type air conditioning cycle system with automatic defrosting function according to claim 1, characterized in that: the controller is a programmable controller with a display touch screen.
3. The energy saving type air conditioning cycle system with automatic defrosting function according to claim 1, characterized in that: the first condenser and the second condenser are equal in size.
4. The energy saving type air conditioning cycle system with automatic defrosting function according to claim 1, characterized in that: the first throttle valve, the second throttle valve and the third throttle valve are all bidirectional adjustable throttle valves.
5. The control method of an energy saving type air conditioning cycle system having an automatic defrosting function according to claim 1, characterized in that: the control method comprises refrigeration control and heating control;
the refrigeration control is as follows: the controller passes through indoor temperature sensor monitoring room temperature, and when the temperature was higher than the setting value, the drive compressor operation controlled the D → C both ends and the S → E both ends of cross valve and switched on, and the controller control first solenoid valve, second solenoid valve and second motorised valve close, first motorised valve opens, entire system gets into the refrigeration operation, and its circulation route is:
Figure 618527DEST_PATH_IMAGE002
the heating control is as follows: the controller monitors the indoor temperature through an indoor temperature sensor, when the temperature is lower than a set value, the compressor is driven to run and the S → C two ends and the D → E two ends of the four-way valve are controlled to be conducted, the controller controls the first electromagnetic valve, the second electromagnetic valve and the second electric valve to be closed and the first electric valve to be opened, the whole system enters the heating operation, and the circulation path is as follows:
Figure 430275DEST_PATH_IMAGE004
when the first condenser needs defrosting, the first pressure sensor monitors the pressure reduction and transmits a pressure signal to the controller, the controller controls to rapidly close the first electric valve, slowly open the second electric valve and open the first electromagnetic valve, and the circulation path at the moment is as follows:
Figure 944433DEST_PATH_IMAGE006
due to the participation of the evaporator and the second throttling valve branch, the circulation path is defrosted by the first condenser without stopping indoor heating operation; the first temperature sensor is used for monitoring the temperature of the first condenser during defrosting and sending the temperature signal to the controller, the defrosting operation of the first condenser can be finished quickly because the high temperature output by the compressor directly enters the first condenser, the controller controls the first electromagnetic valve to be closed and the second electromagnetic valve to be opened completely, and the circulation path at the moment is as follows:
Figure 729855DEST_PATH_IMAGE008
when the second condenser needs defrosting, the second pressure sensor can monitor the pressure reduction and transmit the pressure signal to the controller, the controller controls to quickly close the second electric valve, slowly open the first electric valve and open the second electric valve, and the circulation path at the moment is as follows:
Figure 278648DEST_PATH_IMAGE010
due to the participation of the evaporator and the first throttling valve branch, the circulation path is defrosted by the second condenser without stopping indoor heating operation; the second temperature sensor is used for monitoring the temperature of the second condenser during defrosting and sending the temperature signal to the controller, because the high temperature output by the compressor directly enters the second condenser, the defrosting operation of the second condenser can be finished quickly, the controller controls to close the second electromagnetic valve and completely open the first electric valve, and the circulation path at the moment is as follows:
Figure 664892DEST_PATH_IMAGE012
returning to use the first condenser;
the above processes are circularly carried out in the heating process.
CN202010474484.9A 2020-05-29 2020-05-29 Energy-saving air conditioner circulating system with automatic defrosting function and control method Pending CN111473475A (en)

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CN202010474484.9A CN111473475A (en) 2020-05-29 2020-05-29 Energy-saving air conditioner circulating system with automatic defrosting function and control method

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Application Number Priority Date Filing Date Title
CN202010474484.9A CN111473475A (en) 2020-05-29 2020-05-29 Energy-saving air conditioner circulating system with automatic defrosting function and control method

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CN111473475A true CN111473475A (en) 2020-07-31

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