CN110486891B - Defrosting control method and air conditioner - Google Patents
Defrosting control method and air conditioner Download PDFInfo
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- CN110486891B CN110486891B CN201910777955.0A CN201910777955A CN110486891B CN 110486891 B CN110486891 B CN 110486891B CN 201910777955 A CN201910777955 A CN 201910777955A CN 110486891 B CN110486891 B CN 110486891B
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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
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- 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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
- F24F2140/12—Heat-exchange fluid pressure
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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
- F25B2347/00—Details for preventing or removing deposits or corrosion
- F25B2347/02—Details of defrosting cycles
Abstract
The defrosting control method provided by the invention firstly switches the heating mode to the defrosting mode: reducing the frequency of the compressor from a first compression frequency to a second compression frequency, closing the electromagnetic valve, reducing the frequency of the compressor from the second compression frequency to a third compression frequency, opening the four-way reversing valve for reversing when the high-low pressure difference meets the reversing condition of the four-way reversing valve, simultaneously opening the electromagnetic valve, increasing the frequency of the compressor from the third compression frequency to a fourth compression frequency, and switching to a defrosting mode; and then the defrosting mode is switched back to the heating mode: reducing the frequency of the compressor from the fourth compression frequency to the second compression frequency, closing the electromagnetic valve, reducing the frequency of the compressor from the second compression frequency to the third compression frequency, opening the four-way reversing valve for reversing when the high-low pressure difference meets the reversing condition of the four-way reversing valve, simultaneously opening the electromagnetic valve, increasing the frequency of the compressor from the third compression frequency to the first compression frequency, and switching back to the heating mode; the whole defrosting process is short in time consumption and small in temperature fluctuation.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a defrosting control method and an air conditioner.
Background
The inverter air conditioner has the advantages of comfortable temperature control, energy conservation, power conservation and the like, and the market occupation ratio is getting larger and larger. When the air conditioner operates in a winter heating working condition, if high-frequency operation is required to obtain large heating quantity, the outdoor unit of the air conditioner is easy to frost and inevitable. The room temperature is easy to fluctuate in the frosting and defrosting process, the user experience comfort is poor, and meanwhile, the performance and the energy efficiency of the air conditioner are also seriously influenced. The defrosting of the air conditioner at present adopts reverse circulation defrosting, namely: the refrigeration operation is converted for defrosting, the defrosting is completed, then the operation is converted back to heating for continuous operation, the process involves two times of reversing of the four-way valve, and in order to reduce the impact of sudden pressure change on system components and the noise generated when the four-way valve is switched, the system pressure difference needs to be reduced to a lower value before the four-way valve is reversed. The method for reducing the system pressure difference by stopping twice and the method for reducing the system pressure difference by greatly reducing the frequency of the compressor are two control schemes which are widely applied to reducing the system pressure difference in the defrosting switching process. However, both of the two control schemes have the problem of long time consumption in the process of reducing the frequency or the process of down-converting shutdown, and meanwhile, the long-time temperature control fluctuation is brought, the heating comfort is poor, and the energy consumption waste is serious.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention provides a defrosting control method and an air conditioner.
In one aspect, the present invention provides a defrost control method applied to an air conditioner including a solenoid valve installed between a four-way reversing valve and a reservoir, the method including: firstly, switching from a heating mode to a defrosting mode, and then switching from the defrosting mode back to the heating mode;
the switching from the heating mode to the defrosting mode comprises the following steps:
receiving a defrosting instruction;
reducing the compressor frequency from a first compression frequency to a second compression frequency, the frequency reduction rate being a first frequency reduction rate;
closing the electromagnetic valve, and reducing the frequency of the compressor from the second compression frequency to a third compression frequency, wherein the frequency reduction rate is a second frequency reduction rate;
the compressor is enabled to run at a third compression frequency, when the high-low pressure difference meets the reversing condition of the four-way reversing valve, the four-way reversing valve is opened for reversing, the electromagnetic valve is opened at the same time, the frequency of the compressor is increased from the third compression frequency to a fourth compression frequency, the frequency increasing rate is a third frequency increasing rate, and the air conditioner is switched to a defrosting mode;
the switching back to the heating mode from the defrost mode comprises:
receiving a heating instruction;
reducing the compressor frequency from the fourth compression frequency to the second compression frequency, the frequency reduction rate being the first frequency reduction rate;
closing the electromagnetic valve, and reducing the frequency of the compressor from the second compression frequency to a third compression frequency, wherein the frequency reduction rate is a second frequency reduction rate;
the compressor is enabled to run under a third compression frequency, when the high-low pressure difference meets the reversing condition of the four-way reversing valve, the four-way reversing valve is opened for reversing, the electromagnetic valve is opened at the same time, the frequency of the compressor is increased from the third compression frequency to the first compression frequency, the frequency increasing rate is a third frequency increasing rate, and the air conditioner is switched back to the heating mode;
the parameter values in the above steps are determined according to the displacement of the compressor and the defrosting switching speed.
In the method, preferably, the first compression frequency is 85 to 110HZ, and the difference between the first compression frequency and the second compression frequency is 5 to 20 HZ; the first frequency reduction rate is 1-2 Hz/s; the difference value between the second compression frequency and the third compression frequency is 10-20 HZ; the second frequency reduction rate is 1-10 Hz/s; the high-low pressure difference meeting the reversing condition of the four-way reversing valve is 0-1.5 MPa; the third frequency raising rate is 1-10 Hz/s.
In another aspect, the present invention provides an air conditioner applied to the method as described above, the air conditioner comprising: the system comprises a compressor, a four-way reversing valve, a condenser, a throttling device, an evaporator, an electromagnetic valve, a liquid storage device and a main controller which are connected in sequence to form a closed loop; refrigerant circulates in said closed circuit; the electromagnetic valve is arranged between the four-way reversing valve and the liquid reservoir; the main controller comprises a first logic module which is a defrosting condition judgment logic module calculated by coupling of the condenser and an additional sensor thereof.
The air conditioner as described above further includes: a high and low pressure sensor; the main controller also comprises a second logic module which is a pressure detection, comparison and judgment logic module of a machine with a high-low pressure sensor.
The invention provides a defrosting control method and an air conditioner, wherein an air suction pipe of a compressor of the air conditioner is provided with an electromagnetic valve, and the method comprises the following steps: the heating mode is switched to the defrosting mode, and then the defrosting mode is switched back to the heating mode. Wherein, switch to the defrosting mode by heating mode, specifically include: reducing the frequency of the compressor from a first compression frequency to a second compression frequency, closing the electromagnetic valve, reducing the frequency of the compressor from the second compression frequency to a third compression frequency, opening the four-way reversing valve for reversing when the high-low pressure difference meets the reversing condition of the four-way reversing valve, simultaneously opening the electromagnetic valve, increasing the frequency of the compressor from the third compression frequency to a fourth compression frequency, and switching to a defrosting mode; switch back to the heating mode by the defrosting mode, specifically include: and when the high-low pressure difference meets the reversing condition of the four-way reversing valve, the four-way reversing valve is opened for reversing, the electromagnetic valve is opened simultaneously, the frequency of the compressor is increased from the third compression frequency to the first compression frequency, and the heating mode is switched back. According to the technical scheme provided by the invention, the time of the whole defrosting process is short, the temperature fluctuation is small, and the user experience is good.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of a defrost control method provided by the present invention;
FIG. 2 is a schematic structural diagram of an air conditioner according to the present invention;
FIG. 3 is a flow chart of the control of switching from heating to cooling defrosting in an embodiment of the present invention;
FIG. 4 is a flow chart of the control of switching from cooling and defrosting to heating according to the application of the defrosting control method of the present invention;
fig. 5 is a graph of frequency control comparison of the defrost control scheme provided by the present invention and the prior art defrost control scheme.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
When heating in winter, especially when the outdoor temperature is lower than 0 ℃, if a better heating effect is required, the variable frequency air conditioner can operate at high frequency, the system pressure difference is increased, the heating quantity is improved, so that the advantages of the variable frequency air conditioner are exerted, meanwhile, the air conditioner can frost, and defrosting is needed after frosting, which is the reality that all air conditioners cannot avoid. The switching of refrigeration and heating in the defrosting process inevitably causes the change of heating output, and the fluctuation of temperature is inevitable. Based on the fact that the process cannot be eliminated, the technical scheme provided by the invention aims to shorten the time required by the process or reduce the influence of the process on temperature fluctuation through pressure and refrigerant control. Fig. 1 is a flowchart of a defrosting control method according to the present invention. The method is applied to the air conditioner, and the electromagnetic valve is additionally arranged on the air suction pipe of the compressor of the air conditioner. Referring to fig. 1, in the defrosting control method of the present embodiment, the heating mode is switched to the defrosting mode, and then the defrosting mode is switched back to the heating mode.
The switching from the heating mode to the defrosting mode may specifically include:
and S1, receiving a defrosting instruction.
And S2, reducing the compressor frequency from the first compression frequency to the second compression frequency, wherein the frequency reduction rate is the first frequency reduction rate.
And S3, closing the electromagnetic valve, and reducing the frequency of the compressor from the second compression frequency to a third compression frequency, wherein the frequency reduction rate is the second frequency reduction rate.
And S4, the compressor is enabled to run at a third compression frequency, when the high-low pressure difference meets the reversing condition of the four-way reversing valve, the four-way reversing valve is opened for reversing, the electromagnetic valve is opened simultaneously, the frequency of the compressor is increased from the third compression frequency to a fourth compression frequency, the frequency increasing rate is a third frequency increasing rate, and the air conditioner is switched to a defrosting mode.
The switching from the defrosting mode to the heating mode may specifically include:
and S5, receiving a heating command.
And S6, reducing the compressor frequency from the fourth compression frequency to the second compression frequency, wherein the frequency reduction rate is the first frequency reduction rate.
And S7, closing the electromagnetic valve, and reducing the frequency of the compressor from the second compression frequency to a third compression frequency, wherein the frequency reduction rate is the second frequency reduction rate.
And S8, the compressor is enabled to run at a third compression frequency, when the high-low pressure difference meets the reversing condition of the four-way reversing valve, the four-way reversing valve is opened for reversing, the electromagnetic valve is opened simultaneously, the frequency of the compressor is increased from the third compression frequency to the first compression frequency, the frequency increasing rate is a third frequency increasing rate, and the air conditioner is switched back to the heating mode.
The parameter values in the steps are the optimal coupling state parameters calculated through theoretical analysis and experimental data based on the reliability and defrosting switching speed of the air conditioner. Preferably, the first compression frequency is 85 to 110HZ, and the difference value between the first compression frequency and the second compression frequency is 5 to 20 HZ; the first frequency reduction rate is 1-2 Hz/s; the difference value between the second compression frequency and the third compression frequency is 10-20 HZ; the second frequency reduction rate is 1-10 Hz/s; the high-low pressure difference meeting the reversing condition of the four-way reversing valve is 0-1.5 MPa; the third frequency raising rate is 1-10 Hz/s.
According to the technical scheme provided by the embodiment of the invention, the electromagnetic valve additionally arranged on the air suction pipe of the compressor is reasonably controlled, so that the pressure difference of a system can be quickly reduced, better refrigerant distribution is established, and the establishment of the steady state after the four-way valve is reversed is accelerated. The pressure difference of the system is reduced by the refrigerant flowing from the high-pressure side to the low-pressure side, so that the aim of rapidly reducing the pressure difference of the inverter air conditioner can be fulfilled by controlling the refrigerant migration. When the electromagnetic valve is closed, the compressor can only suck the refrigerant in the liquid accumulator, and the refrigerant in the condenser continuously flows to the evaporator, so that the pressure of the evaporator can be quickly increased, the high-low pressure difference can be quickly reduced, the frequency of the corresponding compressor under the same high-low pressure difference reversing condition can be increased, and the frequency reduction and time consumption are shortened; and after the four-way valve is switched to heating operation again from refrigeration and defrosting, the time consumed by the frequency increase of the compressor is also shortened. Compared with the traditional frequency reduction reversing, the control scheme provided by the invention does not need a compressor to greatly reduce the consumed time to the ultralow frequency, and greatly shortens the defrosting time.
In another aspect, the present invention provides an air conditioner including: the system comprises a compressor, a four-way reversing valve, a condenser, a throttling device, an evaporator, an electromagnetic valve, a liquid storage device and a main controller which are connected in sequence to form a closed loop; refrigerant circulates in said closed circuit; the electromagnetic valve is arranged between the four-way reversing valve and the liquid reservoir; the main controller comprises a first logic module which is a defrosting condition judgment logic module calculated by coupling of the condenser and an additional sensor thereof. Optionally, the air conditioner may further include: a high and low pressure sensor; the main controller can also comprise a second logic module, and the second logic module is a pressure detection, comparison and judgment logic module of a machine with a high-low pressure sensor. Fig. 2 is a schematic structural diagram of an air conditioner provided by the present invention. Referring to fig. 2, the refrigeration system includes: the system comprises a compressor 1, a four-way reversing valve 2, a condenser 3, a throttling device 4, an evaporator 5, an electromagnetic valve 6 and a liquid storage device 7 which are sequentially connected to form a closed loop; refrigerant circulates in said closed circuit; the electromagnetic valve 6 is arranged between the four-way reversing valve 2 and the liquid reservoir 7. C1 is a defrosting condition judgment logic module calculated by coupling the condenser 3 and additional sensors thereof; c2 is the pressure detection, comparison and judgment logic module of the machine with high and low pressure sensors.
The following is an application example of the technical solution provided by the embodiment of the present invention.
Fig. 3 is a control flowchart of switching from heating to cooling defrosting in an application embodiment of the defrosting control method provided by the present invention. Referring to fig. 3, the heating → cooling defrost control scheme is:
step 1: the whole machine control module receives the defrosting signal of C1, the opening of the throttling device 4 is opened to the maximum (the fixed throttling type machine is not adjusted), the frequency of the compressor 1 is reduced from F _1 by delta F1 to F _2, the frequency reduction rate is n1/s, and the process takes time t 1;
step 2: when the frequency of the compressor 1 is reduced to F _2, the electromagnetic valve 6 is closed, the frequency of the compressor 1 is reduced by delta F2 to F _3 from F _2, the frequency reduction rate is n2/s, and the process takes time t 2;
and step 3: the compressor 1 continues to operate at the F _3 frequency operation time t3 (the time t3 'for the machine with the high-low pressure sensor depends on the following judgment logics that the pressure sensors p1 and p2 detect and transmit signals to the control module C2, when the high-low pressure difference delta p does not meet the reversing condition of the four-way reversing valve 2, the compressor 1 continues to operate at the F _3 frequency, when the high-low pressure difference meets the reversing condition of the four-way reversing valve 2, the control module C2 transmits signals to the whole machine control module, the process uses t 3') to reverse the four-way reversing valve 2, the electromagnetic valve 6 is opened at the same time, the frequency of the compressor 1 is increased from F _3 to F _4, the frequency increasing rate is n3/s, and the compressor enters the refrigeration and defrosting conditions.
C1 is a defrosting condition judgment logic module calculated by coupling the condenser 3 and additional sensors thereof; c2 is a pressure detection, comparison and judgment logic module of a machine with a high-low pressure sensor; f _1 is the heating operation frequency before defrosting of the press, F _1 is generally high, if F _1 is low, the system pressure difference is small, the evaporation pressure is high, frosting is not easy to occur, and the heating capacity is low at the moment; f _4 is set to be generally high, and quick refrigeration and defrosting are realized; the parameters are values set in an air conditioner control chip, and are obtained by a research and development engineer through theoretical analysis and tests according to the displacement of a press and the size of a system during product development, and parameter setting can ensure the reliability of the system and quickly realize quick defrosting process conversion, fully play the advantages of comfort and energy conservation of the variable frequency air conditioner and be optimal coupling state parameters. Preferred setting ranges are recommended for the above main parameters according to a number of experiments and empirical analysis: f _1 is set to 85-110 HZ, delta F1 is set to 5-20HZ, delta F2 is set to 10-20 HZ, F _3 can be switched by a four-way valve above 70HZ, n1 is set to 1-2 Hz/s, n2 is set to 1-10 Hz/s, n3 is set to 1-10 Hz/s, and delta p is set to 0-1.5 MPa.
By applying the technical scheme provided by the invention, the time for switching the frequency reduction time t1+ t2+ t3 before refrigeration to the ultralow frequency is greatly shortened compared with the conventional scheme, and meanwhile, after the technical scheme provided by the invention is applied, the pressure difference in the refrigeration and defrosting processes is quickly established, and the defrosting speed is greatly improved.
Fig. 4 is a control flowchart of switching from cooling defrosting to heating in an application embodiment of the defrosting control method provided by the present invention. Referring to fig. 4, the refrigeration defrost → heating control scheme is:
step 1: the whole machine control module receives a heating signal of C1, the opening degree of the throttling device 4 is opened to the maximum (the fixed throttling type machine is not adjusted), the frequency of the compressor 1 is reduced from F _4 by delta F1 to F _2, the frequency reduction rate is n1/s, and the process takes time t 1;
step 2: when the frequency of the compressor 1 is reduced to F _2, the electromagnetic valve 6 is closed, the frequency of the compressor 1 is reduced by delta F2 to F _3 from F _2, the frequency reduction rate is n2/s, and the process takes time t 2;
and step 3: the compressor 1 continues to operate at the F _3 frequency operation time t3 (when the machine with the high-low pressure sensor is used, t3 'depends on the following judgment logics that the pressure sensors p1 and p2 detect and transmit signals to the control module C2, when the high-low pressure difference does not meet the reversing condition of the four-way reversing valve 2, the compressor 1 continues to operate at the F _3 frequency, when the high-low pressure difference meets the reversing condition of the four-way reversing valve 2, the control module C2 transmits signals to the whole machine control module, during the process, t 3') the four-way reversing valve 2 reverses, the electromagnetic valve 6 is opened at the same time, the frequency of the compressor 1 is increased from F _3 to F _1, the frequency increasing rate is n3/s, and the original heating operation condition is entered.
By adopting the technical scheme provided by the invention, the frequency reduction time t1+ t2+ t3 after refrigeration and defrosting is reduced to ultralow frequency time and is greatly shortened compared with the conventional scheme, and meanwhile, after the technical scheme provided by the invention is applied, the pressure difference is quickly established in the process of re-running and heating, the heating quantity is quickly improved, and the quick heating is realized. The whole conversion and defrosting process is short in time, small in temperature fluctuation and greatly improved in comfort.
In this embodiment, F _4 to F _1 are taken as examples, so that the two frequency reduction processes are simplified into a consistent model, which is convenient for a reader to understand the core content of the present invention more easily, but the scope of the present invention is not limited thereto.
Fig. 5 is a graph of frequency control comparison of the defrost control scheme provided by the present invention and the prior art defrost control scheme. Referring to fig. 5, T1 is the time required for the whole process of the defrosting control scheme provided by the present invention, and T0 is the time required for the whole process of the prior art defrosting control scheme; f _0 is the required frequency for switching in the prior art defrosting control, and F _3 is the switching frequency which can be realized by the defrosting control scheme provided by the invention.
In summary, in the air conditioner provided by the embodiment of the invention, the electromagnetic valve additionally arranged on the air suction pipe of the compressor is controlled, so that the system pressure difference is quickly reduced, better refrigerant distribution is established, and the establishment of the steady state after the four-way valve is reversed is accelerated. The pressure difference of the system is reduced by the refrigerant flowing from the high-pressure side to the low-pressure side, so that the embodiment of the invention can realize the quick reduction of the pressure difference and the quick switching of the cooling and heating processes of the inverter air conditioner by controlling the migration of the refrigerant. The control mode comprehensively considers the requirements of system reliability, user comfort experience, energy and power saving and low noise, and improves the reliability and stability of the air conditioning system and the user experience of products.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. The defrosting control method is characterized by being applied to an air conditioner, wherein the air conditioner comprises an electromagnetic valve which is arranged between a four-way reversing valve and a liquid storage device; the method comprises the following steps: firstly, switching from a heating mode to a defrosting mode, and then switching from the defrosting mode back to the heating mode;
the switching from the heating mode to the defrosting mode comprises the following steps:
receiving a defrosting instruction;
reducing the compressor frequency from a first compression frequency to a second compression frequency, the frequency reduction rate being a first frequency reduction rate;
closing the electromagnetic valve, and reducing the frequency of the compressor from the second compression frequency to a third compression frequency, wherein the frequency reduction rate is a second frequency reduction rate;
the compressor is enabled to run at a third compression frequency, when the high-low pressure difference meets the reversing condition of the four-way reversing valve, the four-way reversing valve is opened for reversing, the electromagnetic valve is opened at the same time, the frequency of the compressor is increased from the third compression frequency to a fourth compression frequency, the frequency increasing rate is a third frequency increasing rate, and the air conditioner is switched to a defrosting mode;
the switching back to the heating mode from the defrost mode comprises:
receiving a heating instruction;
reducing the compressor frequency from the fourth compression frequency to the second compression frequency, the frequency reduction rate being the first frequency reduction rate;
closing the electromagnetic valve, and reducing the frequency of the compressor from the second compression frequency to a third compression frequency, wherein the frequency reduction rate is a second frequency reduction rate;
the compressor is enabled to run under a third compression frequency, when the high-low pressure difference meets the reversing condition of the four-way reversing valve, the four-way reversing valve is opened for reversing, the electromagnetic valve is opened at the same time, the frequency of the compressor is increased from the third compression frequency to the first compression frequency, the frequency increasing rate is a third frequency increasing rate, and the air conditioner is switched back to the heating mode;
the parameter values in the above steps are determined according to the displacement of the compressor and the defrosting switching speed.
2. The method of claim 1, wherein the first compression frequency is 85 to 110HZ, and the difference between the first compression frequency and the second compression frequency is 5 to 20 HZ.
3. The method of claim 2, wherein the first downconversion rate is 1-2 Hz/s.
4. The method of claim 3, wherein the difference between the second compression frequency and the third compression frequency is 10-20 Hz.
5. The method of claim 4, wherein the second downconversion rate is 1-10 Hz/s.
6. The method of claim 5, wherein the third ramp rate is 1-10 Hz/s.
7. The method according to any one of claims 1 to 6, wherein the high-low pressure difference meeting the reversing condition of the four-way reversing valve is 0-1.5 MPa.
8. An air conditioner characterized by being applied to the method according to any one of claims 1 to 7, the air conditioner comprising: the system comprises a compressor, a four-way reversing valve, a condenser, a throttling device, an evaporator, an electromagnetic valve, a liquid storage device and a main controller which are connected in sequence to form a closed loop; refrigerant circulates in said closed circuit; the electromagnetic valve is arranged between the four-way reversing valve and the liquid reservoir; the main controller comprises a first logic module which is a defrosting condition judgment logic module calculated by coupling of the condenser and an additional sensor thereof.
9. The air conditioner according to claim 8, further comprising: a high and low pressure sensor; the main controller also comprises a second logic module which is a pressure detection, comparison and judgment logic module of a machine with a high-low pressure sensor.
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