CN110940055A - Heating and defrosting control method and device for air conditioner and air conditioner - Google Patents
Heating and defrosting control method and device for air conditioner and air conditioner Download PDFInfo
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- CN110940055A CN110940055A CN201911299501.3A CN201911299501A CN110940055A CN 110940055 A CN110940055 A CN 110940055A CN 201911299501 A CN201911299501 A CN 201911299501A CN 110940055 A CN110940055 A CN 110940055A
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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
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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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
- 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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- Air Conditioning Control Device (AREA)
Abstract
The invention provides a heating and defrosting control method and device for an air conditioner and the air conditioner, and relates to the technical field of air conditioners. The control method comprises the following steps: determining that the air conditioner operates in a heating mode, and acquiring the outdoor environment temperature, the air outlet temperature and the outer disc temperature; judging whether the conditions for entering a bypass defrosting mode are met or not according to the outdoor environment temperature, the air outlet temperature and the outer disc temperature; and if the condition of entering the bypass defrosting mode is met, opening a bypass control valve, and entering the bypass defrosting mode to prevent the outdoor heat exchanger from frosting, wherein the bypass control valve is connected with a throttling component of the air conditioner in parallel. According to the invention, by arranging the bypass loop, the temperature of the refrigerant entering the outdoor heat exchanger is gradually raised by mixing the high-temperature refrigerant with the throttled low-temperature refrigerant, so that the return air temperature is gradually raised, the frost layer is gradually melted, and the defrosting operation is realized under the condition that the compressor does not shut down.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a heating and defrosting control method and device of an air conditioner and the air conditioner.
Background
The air source heat pump system frosting problem is the key technical problem of the air conditioner, and has obvious influence on heating performance and comfort. The outdoor unit of the air conditioner running in a wet and cold area is often frosted, and periodic defrosting is needed to ensure the continuous and efficient running of the air conditioner. At present, the existing defrosting control mode is usually stop defrosting, namely frequency correction control is performed through target condensing temperature, and for the lower working condition of the outside environment, the compressor is easy to frost after the frequency is raised to the maximum, so that the air conditioner can be repeatedly and periodically stopped for defrosting, and the use comfort of a user is seriously influenced.
Disclosure of Invention
The invention solves the problems that: the defrosting is carried out under the condition that the compressor is not shut down under the working condition of low-temperature heating of the air conditioner.
In order to solve the above problems, the present invention provides a heating and defrosting control method for an air conditioner, comprising the following steps: when the air conditioner operates in a heating mode, acquiring the outdoor environment temperature, the air outlet temperature and the outer disc temperature; judging whether the conditions for entering a bypass defrosting mode are met or not according to the outdoor environment temperature, the air outlet temperature and the outer disc temperature; and if the condition of entering the bypass defrosting mode is met, opening a bypass control valve, and entering the bypass defrosting mode to prevent the outdoor heat exchanger from frosting, wherein the bypass control valve is connected with a throttling component of the air conditioner in parallel.
Therefore, by arranging the bypass loop, the outdoor environment temperature, the air outlet temperature and the outer disc temperature are used as the conditions for entering the bypass defrosting mode, the on-off state of the bypass control valve is controlled, the path for the circulation of the refrigerant is effectively adjusted, a part of the medium-temperature liquid refrigerant flowing out of the indoor heat exchanger directly enters the outdoor heat exchanger, the other part of the medium-temperature liquid refrigerant flowing out of the indoor heat exchanger normally enters the outdoor heat exchanger after passing through the throttling device, the medium-temperature refrigerant and the throttled low-temperature refrigerant are mixed to gradually increase the temperature of the refrigerant entering the outdoor heat exchanger, the return air temperature is gradually increased, the frost layer is gradually melted, defrosting operation is carried out under the condition that the compressor does not shut down, the problems of energy consumption waste and poor user experience caused by shutdown defrosting are avoided, and the ultra-low temperature heating requirements of users in special areas are met.
Further, the meeting the condition of entering the bypass defrosting mode specifically includes, at the same time, meeting the following condition: the outdoor environment temperature is less than or equal to a first preset temperature; the air outlet temperature is less than or equal to a second preset temperature; the outdoor coil temperature is less than or equal to the outdoor ambient temperature.
Therefore, the bypass control valve is controlled to be opened by taking the outdoor environment temperature, the air outlet temperature and the outer disc temperature as parameters, so that whether the outdoor unit needs defrosting can be judged more accurately on one hand, the defrosting time can be selected more accurately, unnecessary defrosting is effectively avoided, and energy consumption is reduced; on the other hand, the bypass defrosting process is more accurately controlled by limiting the condition of entering the bypass defrosting mode, the air conditioner can continuously heat, the fluctuation of the indoor temperature is reduced to the maximum extent, and the heating effect of the air conditioner is greatly ensured.
Further, the method also comprises the following steps: acquiring the air inlet pressure, the air outlet pressure and the inner disc temperature of a compressor; judging whether the conditions for exiting the bypass defrosting mode are met or not according to the air inlet pressure, the air outlet pressure and the inner disc temperature; and if the condition of exiting the bypass defrosting mode is met, closing the bypass control valve to exit the bypass defrosting mode.
Therefore, the air inlet pressure, the air outlet pressure and the temperature of the inner disc are used as parameters for controlling the on-off state of the bypass control valve, the process of the bypass defrosting mode is accurately controlled, and the phenomena of insufficient air suction, incomplete air exhaust and even compressor shutdown caused by overhigh return air temperature due to overlong bypass defrosting time can be effectively avoided; and the phenomenon of incomplete defrosting caused by too low return air temperature due to too long and too short bypass defrosting time can be avoided.
Further, the meeting the condition of exiting the bypass defrosting mode specifically includes: the ratio of the outlet pressure to the inlet pressure is less than the minimum compression ratio of the compressor, and the inner disc temperature is greater than or equal to a third preset temperature.
Therefore, the compression ratio and the minimum compression ratio of the compressor, the real-time inner disc temperature obtained after entering the bypass defrosting mode and the third preset temperature are compared at the same time, and the on-off state of the bypass control valve is adjusted through multiple judgment, so that the control precision is further improved, and the energy efficiency waste is avoided.
Further, the third preset temperature is a preset inner disc temperature value when the compressor operates stably and the outdoor heat exchanger is not frosted.
Therefore, the accuracy of judgment is further improved, and the outdoor heat exchanger is guaranteed to be completely defrosted.
Further, it is characterized in that the minimum compression ratio of the compressor and the operating frequency of the compressor satisfy the following relation: when f is more than or equal to 12 and less than or equal to 30, P0 is 2/25 f-2/5; when f is more than or equal to 30, P0 is 2; wherein P0 is the minimum compression ratio of the compressor, and f is the operating frequency of the compressor.
Therefore, according to the running frequency of different compressors, the minimum compression ratio of the compressor according to judgment is different, so that the air conditioner is controlled more accurately, and the user experience is improved.
Another objective of the present invention is to provide a heating and defrosting device for an air conditioner, so that the air conditioner can defrost under the condition that the compressor is not shut down under the low-temperature heating condition.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a heating and defrosting apparatus of an air conditioner, comprising:
the acquisition module is used for acquiring the outdoor environment temperature, the air outlet temperature and the outer disc temperature;
the processing module is used for judging whether the conditions for entering the bypass defrosting mode are met or not according to the outdoor environment temperature, the air outlet temperature and the outer disc temperature;
and the control module is used for controlling to open the bypass control valve to enter the bypass defrosting mode when the condition of entering the bypass defrosting mode is met.
The third objective of the present invention is to provide an air conditioner, so that the defrosting is performed under the condition that the compressor is not shut down under the low-temperature heating working condition of the air conditioner.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an air conditioner comprising a computer readable storage medium storing a computer program and a processor, the computer program being read and executed by the processor to implement the air conditioner heating and defrosting control method as described above.
Further, the air conditioner further includes: the compressor, the indoor heat exchanger, the throttling assembly and the outdoor heat exchanger are sequentially communicated and form a refrigerant circulation loop; the bypass loop is communicated with the refrigerant circulation loop and is arranged in parallel with the throttling assembly; and the bypass control valve is arranged on the bypass loop.
Compared with the prior art, the heating defrosting device of the air conditioner and the air conditioner have the same advantages with the heating defrosting control method of the air conditioner, and are not repeated herein.
A fourth objective of the present invention is to provide a computer-readable storage medium for implementing the heating and defrosting control method of the air conditioner.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a computer-readable storage medium storing a computer program which, when read and executed by a processor, implements the air conditioner heating and defrosting control method as described above.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention.
In the drawings:
fig. 1 is a schematic diagram illustrating a heating and defrosting control method of an air conditioner according to an embodiment of the present invention;
FIG. 2 is a flow chart of a heating and defrosting control method for an air conditioner according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a heating and defrosting apparatus of an air conditioner according to an embodiment of the present invention.
Description of reference numerals:
the system comprises a compressor 1, a four-way reversing valve 2, an indoor heat exchanger 3, a throttling assembly 4, an outdoor heat exchanger 5, a centrifugal fan 6, a bypass loop 7, a bypass control valve 8, a temperature detector 9, a device sensor 10, a high-pressure sensor 11, a low-pressure stop valve 12 and a high-pressure stop valve 13.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
Furthermore, the following description, if any, of "first," "second," etc. is used for descriptive purposes only and not for purposes of indicating or implying relative importance or implicitly indicating the number of technical features indicated. Furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Generally, when an air conditioner is in a heating working condition, a coil of an outdoor unit of the air conditioner is easy to frost, and the performance of a refrigeration system is reduced due to frosting of the coil of the outdoor unit, so that the heating effect of the air conditioner is affected, the comfort of an indoor environment is reduced, and the user experience is affected. Therefore, in the situation that the air conditioner is in the heating working condition, the outdoor unit coil of the air conditioner needs to be defrosted timely and effectively. In order to solve the problem of frosting of the air conditioner, refrigeration defrosting (reversing a four-way reversing valve and reverse circulation) is usually adopted in the prior art, however, when a refrigeration defrosting mode is adopted, the indoor environment temperature can be obviously reduced, the heating effect of the air conditioner is reduced, and the comfort of the indoor environment is influenced; and with the continuous conversion of the refrigeration and heating modes, the refrigerant flowing through the indoor unit is frequently switched between high temperature and low temperature, so that part of the structural body of the indoor unit generates frequent abnormal noise due to expansion caused by heat and contraction caused by cold.
In order to solve the problems, the invention provides a heating and defrosting control method and device for an air conditioner and the air conditioner.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Referring to fig. 1, an embodiment of the present invention provides a heating and defrosting control method for an air conditioner, including the following steps:
s1, when the air conditioner runs in a heating mode, acquiring the outdoor environment temperature, the air outlet temperature and the outer disc temperature;
s2, judging whether the conditions for entering the bypass defrosting mode are met according to the outdoor environment temperature, the air outlet temperature and the outer disc temperature;
and S3, if the condition of entering the bypass defrosting mode is met, opening the bypass control valve 8, and entering the bypass defrosting mode to prevent the outdoor heat exchanger 5 from frosting, wherein the bypass control valve 8 is arranged in parallel with the throttling component 4 of the air conditioner.
If the condition of entering the bypass defrosting mode is not met, the bypass control valve 8 is controlled to be closed, the bypass loop 7 is not conducted, high-temperature refrigerants coming out of the indoor heat exchanger can be throttled and depressurized through the throttling component 4, and the air conditioner keeps a normal heating running state.
Specifically, referring to fig. 3, in the air-conditioning heating defrosting apparatus provided in the embodiment of the present invention in fig. 3, when the air-conditioner heats, the connection relationship and the heating operation principle of the air-conditioner can be seen in the flow direction (indicated by black arrows) of the refrigerant in the refrigerant circulation loop:
the air conditioner comprises a compressor 1, an indoor heat exchanger 3, a throttling assembly 4 and an outdoor heat exchanger 5 which are sequentially communicated and form a refrigerant circulation loop, a bypass loop 7 is further arranged outside the refrigerant circulation loop, the bypass loop 7 is communicated with the refrigerant circulation loop, and the bypass loop 7 is connected with the throttling assembly 4 in parallel; the bypass circuit 7 is provided with a bypass control valve 8, and the on-off of the bypass circuit 7 can be controlled by opening or closing the bypass control valve 8.
When the air conditioning system is in a heating mode, the compressor 1 is started, high-temperature and high-pressure refrigerant steam is discharged from a discharge port of the compressor 1, enters the indoor heat exchanger 3 through the four-way reversing valve 2 and the low-pressure stop valve 12 to perform heat exchange, is changed into medium-temperature refrigerant liquid after heat is released, is changed into a low-temperature and low-pressure gas-liquid two-phase mixture after being subjected to pressure reduction through the high-pressure stop valve 13 and the throttling assembly 4, then enters the outdoor heat exchanger 5 to be evaporated and absorbed to be changed into low-temperature and low-pressure refrigerant steam, then enters the gas-liquid separator through the four-way reversing valve 2 and flows back to.
In the embodiment of the invention, because the throttling component 4 is also connected with the bypass loop 7 in parallel, when the bypass control valve 8 is in an open state, a part of the medium-temperature liquid refrigerant flowing out of the indoor heat exchanger 3 enters the outdoor heat exchanger 5 after being normally throttled by the throttling component 4, so that the normal heating circulation is ensured, the return air temperature is not too high, and the operation reliability of the compressor 1 is ensured; and a part of the medium-temperature liquid refrigerant bypasses the throttling component 4 through the bypass circuit 7 and enters the outdoor heat exchanger 5, and the refrigerant entering the outdoor heat exchanger 5 keeps a high temperature because the refrigerant is not throttled and depressurized, so that the heat of the refrigerant can be utilized to defrost the outdoor heat exchanger 5.
According to the heating and defrosting control method of the air conditioner, the bypass loop 7 is arranged, the outdoor environment temperature, the air outlet temperature and the outer disc temperature are used as the conditions for entering the bypass defrosting mode, the on-off state of the bypass control valve 8 is controlled, the path for the refrigerant to circulate is effectively adjusted, a part of high-temperature liquid refrigerant flowing out of the indoor heat exchanger 3 directly enters the outdoor heat exchanger 5, and defrosting operation is carried out on the outdoor heat exchanger 5 by utilizing the heat of the refrigerant; the other part of the medium-temperature liquid refrigerant flowing out of the indoor heat exchanger 3 normally enters the outdoor heat exchanger 5 after passing through the throttling device, so that the normal heating of the air conditioner is ensured. On one hand, the control method utilizes the mixing of the medium-temperature refrigerant and the throttled low-temperature refrigerant to gradually increase the temperature of the refrigerant entering the outdoor heat exchanger 5, so that the return air temperature is gradually increased, the frost layer is gradually melted, the defrosting operation is realized under the condition that the compressor 1 is not shut down, the problems of energy consumption waste and poor user experience caused by shutdown defrosting are avoided, and the ultra-low temperature heating requirements of users in special areas are met; on the other hand, the low-temperature liquid refrigerant entering the outdoor heat exchanger 5 prevents the return air temperature from being too high, ensures that the bypass control valve 8 can still heat and normally circulate after being opened, improves the reliability of long-time normal operation of the compressor 1, reduces the influence on the indoor temperature, does not cause the indoor heat exchanger 3 to generate abnormal sound due to expansion caused by heat and contraction caused by cold, and prolongs the service life of the air conditioner.
It can be understood that the air-conditioning heating defrosting apparatus provided in this embodiment further includes a plurality of temperature detectors 9, which are respectively disposed on the pipelines of the air-conditioning system, and can be used for detecting the outdoor environment temperature, the outlet air temperature, the outer tray temperature, the inner tray temperature, and the like. Through setting up thermodetector 9, can real-time supervision outdoor environment temperature, air-out temperature, outer dish temperature, inner disc temperature to whether come the judgement according to outdoor environment temperature, air-out temperature, outer dish temperature and inner disc temperature and whether satisfy the condition that gets into bypass defrosting mode, further improved air conditioning system's operating stability.
In the embodiment of the present invention, the bypass control valve 8 may be configured as an electromagnetic valve, an electronic expansion valve, or other control valves, and controls the on-off state or performs opening adjustment according to the outdoor environment temperature, the outlet air temperature, the outer tray temperature, or other determination conditions, so as to achieve more precise control of the refrigerant flow and improve the accuracy of system control.
Of course, the air-conditioning heating defrosting device further includes conventional components such as a centrifugal fan 6, which are not described herein again.
In step S1, it is determined that the air conditioner is operating in the heating mode, and it is required that the heating and defrosting control method of the air conditioner according to the embodiment can be operated only in the power-on heating mode. This is because, when the air conditioner is in the cooling mode, the indoor heat exchanger 3 is an evaporator, and if the bypass control valve 8 is opened, the refrigerant condensed by the outdoor heat exchanger 5 directly enters the evaporator without the throttling assembly, which may seriously affect the evaporation effect and the refrigerant circulation of the air conditioning system, and thus, the bypass defrosting mode can only be opened in the heating mode.
In step S2, the condition for entering the bypass defrosting mode is satisfied, which specifically includes:
the following conditions must be satisfied simultaneously:
outdoor ambient temperature TOuter ringLess than or equal to a first preset temperature T1(ii) a Air outlet temperature TAir outletLess than or equal to a second preset temperature T2(ii) a Outdoor coil temperature TOuter plateLess than or equal to outdoor ambient temperature TOuter ring。
In the heating mode of the air conditioner, after the bypass control valve 8 is opened, the high-temperature high-pressure exhaust refrigerant is condensed by the indoor heat exchanger 3 and then cooled to be changed into a medium-temperature refrigerant,some medium temperature refrigerants are directly mixed with throttled refrigerants without throttling, so that the heating capacity of the air conditioner is reduced, the heating effect is reduced under the conventional working condition, and therefore, the condition that the outdoor environment temperature is low (namely T) is only required to be metOuter ring≤T1) The electromagnetic valve is opened when the defrosting is finished, so that the condition of stopping defrosting can be avoided although the heating capacity is slightly reduced.
Wherein the first preset temperature T1Simulating the measured range value for the air conditioner to continuously run for 8 hours under the rated heating capacity by using a basically non-attenuation experiment, and setting the first preset temperature T for the air conditioners with different heating capacities1There are differences, and no specific limitations are given herein. In the embodiment of the invention, the first preset temperature T1The range value of T is more than or equal to 0 DEG C15 ℃ or less, preferably 3 ℃.
At the same time, the second preset temperature T2The test simulation value is that the lowest limit of the external side ring temperature is below-15 ℃ under the ultralow temperature heating working condition, and the attenuation of the external machine heating capacity reaches 70%. Under the heating mode of the air conditioner, the air outlet temperature of the air conditioner can show the heating effect to a certain extent, the frosting amount of the outdoor unit can be judged more accurately through the heating capacity attenuation value, the defrosting time can be selected more accurately, and the condition that the outdoor unit enters the defrosting operation only after being frosted seriously is avoided. By setting a second preset temperature T2I.e. when TAir outlet≤T2When the outdoor unit is frosted, the defrosting operation can be started, so that the heating capacity attenuation and the air outlet temperature of the air conditioner are guaranteed to be considered simultaneously, and the comfort and the experience of a user are improved. In the embodiment of the invention, the second preset temperature T2The range value of T is more than or equal to 20 DEG C225 ℃ or less, preferably 23 ℃. Of course, it will be understood that the second preset temperature T set for different models and different heat-producing engine models2There are differences, and no specific limitations are given herein.
According to the embodiment of the invention, the bypass control valve 8 is controlled to be opened by taking the outdoor environment temperature, the air outlet temperature and the outer disc temperature as parameters, so that on one hand, whether the outdoor unit needs defrosting can be judged more accurately, the defrosting time can be selected more accurately, unnecessary defrosting is effectively avoided, and the energy consumption is reduced; on the other hand, the bypass defrosting process is more accurately controlled by limiting the condition of entering the bypass defrosting mode, the air conditioner can continuously heat, the fluctuation of the indoor temperature is reduced to the maximum extent, and the heating effect of the air conditioner is greatly ensured.
In step S3, when the condition for entering the bypass defrosting mode is satisfied, the bypass control valve 8 is controlled to open, the bypass circuit 7 is turned on, and a portion of the refrigerant flowing out of the indoor heat exchanger 3 can directly enter the outdoor heat exchanger 5 through the bypass circuit 7, so that the temperature of the refrigerant entering the outdoor heat exchanger 5 is increased to a certain extent, and defrosting can be performed by using the temperature of the refrigerant.
Preferably, after step S3, that is, after the air conditioner enters the bypass defrosting mode, the method further includes the steps of:
s4, obtaining the air inlet pressure P of the compressor 1Low pressurePressure P of gas dischargeHigh pressureAnd inner disc temperature TInner disc；
S5, according to the inlet air pressure, the outlet air pressure and the inner disc temperature TInner discJudging whether the condition of exiting the bypass defrosting mode is met or not;
s6, if the condition for exiting the bypass defrosting mode is satisfied, the bypass control valve 8 is closed to exit the bypass defrosting mode.
If the condition of exiting the bypass defrosting mode is not met, the step S4 is continued to be circulated until the system meets the condition of exiting the bypass defrosting mode, the bypass loop 7 is disconnected, and the air conditioner operates in the normal heating mode.
Specifically, the air-conditioning heating defrosting device provided by this embodiment further includes two pressure sensors, a low pressure sensor 10 is disposed on the air return line of the compressor 1, a high pressure sensor 11 is disposed on the exhaust line of the compressor 1, and the intake pressure P of the compressor 1 can be detected in real time according to the two pressure sensorsLow pressureAnd the pressure of the outlet gas PHigh pressureAccording to the intake pressure PLow pressureAnd the pressure of the outlet gas PHigh pressureThe compression ratio of the compressor 1 can be calculated, and whether the compressor 1 is in a normal operation state can be judged according to the compression ratio.
In the heating and defrosting control method of the air conditioner provided by the embodiment, the air inlet pressure P is adjustedLow pressurePressure of gas discharge PHigh pressureAnd inner disc temperature TInner discThe bypass defrosting mode is accurately controlled as a parameter for controlling the on-off state of the bypass control valve 8, so that the phenomena of insufficient air suction, incomplete air exhaust and even shutdown of the compressor 1 caused by overhigh return air temperature due to overlong bypass defrosting time can be effectively avoided; and the phenomenon of incomplete defrosting caused by too low return air temperature due to too long and too short bypass defrosting time can be avoided.
Further, the meeting the condition of exiting the bypass defrosting mode in step S5 specifically includes:
simultaneously, the following conditions are met: pressure P of gas outletHigh pressureWith the inlet pressure PLow pressureIs smaller than the minimum compression ratio P of the compressor 10And, the obtained inner disk temperature TInner discGreater than or equal to a third preset temperature T3。
After the bypass control valve 8 is opened, the high-temperature and high-pressure refrigerant is condensed by the indoor heat exchanger 3 and then cooled to be changed into a medium-temperature refrigerant, the medium-temperature refrigerant is mixed with the throttled low-temperature refrigerant liquid, the temperature of the refrigerant entering the outdoor heat exchanger 5 is gradually increased, the return air temperature is gradually increased, the compression ratio Pcr of the compressor 1 is also gradually reduced, and when the compression ratio Pcr is lower than the minimum compression ratio P of the compressor 10In time, the compressor 1 may have the situations of insufficient air suction and incomplete air discharge, and may cause insufficient driving force of the rotor in the cylinder of the compressor 1, so that the compressor 1 is frequently stopped. Therefore, the minimum compression ratio P of the compressor 1 is set0As the preset parameter, the real-time compression ratio is compared, and when Pcr is less than P0When the return air temperature reaches the minimum value required by the specification of the air conditioner, the electromagnetic valve needs to be closed, and the bypass circuit 7 needs to be disconnected, so as to ensure the normal operation of the compressor 1.
In addition, in order to further improve the accuracy of judgment, the real-time inner disc temperature T acquired after entering the bypass defrosting mode is simultaneously measuredInner discEnsuring outdoor exchange as a conditional parameter for exiting the bypass control modeThe hot vessel 5 has completely defrosted. Wherein the third preset temperature T3For the preset temperature value of the inner disc when the compressor 1 is stably operated and the outdoor heat exchanger 5 is not frosted, in the embodiment of the invention, the third preset temperature T is set3Defined as the inner disc temperature after 5 minutes of first start-up compressor 1 operation. By comparing T in real timeInner disc、T3When T isInner disc≥T3And meanwhile, the heat exchange effect of the outdoor heat exchanger 5 is restored to the state before the start-up stable operation frosting, and the electromagnetic valve is closed reasonably.
According to the control method for heating and defrosting of the air conditioner, provided by the embodiment of the invention, the real-time inner disc temperature obtained after the air conditioner enters the bypass defrosting mode is compared with the third preset temperature by simultaneously comparing the compression ratio with the minimum compression ratio of the compressor 1, and the on-off state of the bypass control valve 8 is adjusted through multiple judgments, so that the control precision is further improved, and the energy efficiency waste is avoided.
It will be appreciated that the compression ratio Pcr of the compressor 1 is the discharge pressure P of the compressor 1High pressureWith the inlet pressure PLow pressureI.e. Pcr ═ PHigh pressure/PLow pressure。
Wherein, the minimum compression ratio P of the compressor 1 is different according to the model and the minimum operation frequency of the air conditioner0Different. In the embodiment of the present invention, the minimum compression ratio P of the compressor 10And the operating frequency f of the compressor 1 satisfy the following relation:
when f is more than or equal to 12 and less than or equal to 30, P0＝2/25f-2/5；
When f is more than or equal to 30, P0＝2；
Wherein, P0Is the minimum compression ratio of the compressor 1 and f is the operating frequency of the compressor 1 in rps.
The operating frequencies of the compressors 1 are different, the minimum compression ratio P of the compressors 1 being the same0Also differently, when the operating frequency f of the compressor 1 is at [12,30 ]]At rps, the minimum compression ratio P of the compressor 10In [1.2,2 ]]And are linearly related to each other, and satisfy the relation: p0Specifically, when the operating frequency f of the compressor 1 is 12rps, the minimum compression ratio P of the compressor 1 is 2/25f-2/501.2, and the operating frequency f of the compressor 1 is 30rps, the minimum compression ratio P of the compressor 10To 2, when the operating frequency f of the compressor 1 is [30,120 ]]At rps, minimum compression ratio P of compressor 10And 2, according to the running frequency of different compressors 1, the minimum compression ratio value logically judged by the air conditioner at the moment according to the compressor 1 is also different, so that the control of the variable frequency air conditioner is more accurately implemented, and the user experience is improved.
Another embodiment of the present invention provides a heating defrosting apparatus for an air conditioner, including: the device comprises an acquisition module, a processing module and a control module, wherein:
the acquisition module is used for acquiring the outdoor environment temperature, the air outlet temperature and the outer disc temperature;
the processing module is used for judging whether the conditions for entering the bypass defrosting mode are met or not according to the outdoor environment temperature, the air outlet temperature and the outer disc temperature;
and the control module is used for controlling to open the bypass control valve 8 to enter the bypass defrosting mode when the condition of entering the bypass defrosting mode is met.
In the present embodiment, by providing the bypass circuit 7 and taking the outdoor ambient temperature, the outlet air temperature and the outer tray temperature as the conditions for entering the bypass defrosting mode, the on-off state of the bypass control valve 8 is controlled, the path of refrigerant circulation is effectively adjusted, so that a part of the medium-temperature liquid refrigerant flowing out of the indoor heat exchanger 3 directly enters the outdoor heat exchanger 5, the other part of the medium-temperature liquid refrigerant flowing out of the indoor heat exchanger 3 normally enters the outdoor heat exchanger 5 after passing through the throttling device, the temperature of the refrigerant entering the outdoor heat exchanger 5 is gradually increased by mixing the medium-temperature refrigerant with the throttled low-temperature refrigerant, the return air temperature is gradually increased, the frost layer is gradually melted, defrosting is realized under the condition that the compressor 1 does not shut down, the problems of energy consumption waste and poor user experience caused by shutdown defrosting are avoided, and the ultra-low temperature heating requirements of users in special areas are met.
Another embodiment of the present invention further provides an air conditioner, including a computer readable storage medium storing a computer program and a processor, where the computer program is read by the processor and executed to implement the above-mentioned heating and defrosting control method for an air conditioner, and the bypass control valve 8 is opened or closed when the heating operation return air temperature meets a certain condition to increase the evaporation temperature in a heating state, so as to defrost without stopping the compressor 1, thereby ensuring the comfort and experience of users.
The memory is for storing a computer program. In embodiments of the present invention, the Memory may include a computer system readable medium in the form of a volatile Memory, which may be, but is not limited to, a Random Access Memory (RAM), a Read Only Memory (ROM), a Programmable Read Only Memory (PROM), an Erasable Programmable Read Only Memory (EPROM), an Electrically Erasable Programmable Read Only Memory (EEPROM), and the like.
The processor is used for realizing the air conditioner heating and defrosting control method when executing the computer program.
The air conditioner also comprises a compressor 1, an indoor heat exchanger 3, a throttling component 4 and an outdoor heat exchanger 5 which are sequentially communicated and form a refrigerant circulation loop; the bypass loop 7 is communicated with the refrigerant circulation loop and is connected with the throttling component 4 in parallel; and a bypass control valve 8 provided in the bypass circuit 7.
Through increasing bypass circuit 7 in the air conditioner to set up bypass control valve 8 on bypass circuit 7, to the lower condition of outside ambient temperature, through the switch of control solenoid valve, improve the return-air temperature under the low temperature heating state, under the reliable prerequisite of guaranteeing compressor 1 operation, realize the defrosting to outdoor heat exchanger 5, user's ultra-low temperature heating demand is satisfied to the at utmost, guarantees that the user uses the travelling comfort.
In addition, the air conditioner also comprises a low-pressure stop valve 12, one end of the low-pressure stop valve 12 is connected with an inlet of the indoor heat exchanger 3, the other end of the low-pressure stop valve is connected with an exhaust port of the four-way reversing valve 2, the low-pressure stop valve 12 performs low-pressure protection on the air conditioner, when the pressure in a pipeline of the air conditioner is too low, the low-pressure stop valve 12 is timely disconnected, and the refrigerant of the air conditioner stops circulating.
The air conditioner also comprises a high-pressure stop valve 13, one end of the high-pressure stop valve 13 is connected with an outlet of the indoor heat exchanger 3, the other end of the high-pressure stop valve is connected with an outlet of the throttling component 4, the high-pressure stop valve 13 carries out high-pressure protection on the air conditioner, when the pressure in a pipeline of the air conditioner is too high, the high-pressure stop valve 13 is timely disconnected, and the refrigerant of the air conditioner stops circulating.
Another embodiment of the present invention provides a computer-readable storage medium, which stores a computer program, and when the computer program is read and executed by a processor, the computer program implements the above-mentioned heating and defrosting control method for an air conditioner.
The computer readable storage medium has the same advantages as the heating and defrosting control method of the air conditioner in the prior art, and is not described herein again.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A heating and defrosting control method of an air conditioner is characterized by comprising the following steps:
when the air conditioner operates in a heating mode, acquiring the outdoor environment temperature, the air outlet temperature and the outer disc temperature;
judging whether the conditions for entering a bypass defrosting mode are met or not according to the outdoor environment temperature, the air outlet temperature and the outer disc temperature;
and if the condition of entering the bypass defrosting mode is met, opening a bypass control valve (8) to enter the bypass defrosting mode so as to prevent the outdoor heat exchanger (5) from frosting, wherein the bypass control valve (8) is connected with a throttling component (4) of the air conditioner in parallel.
2. The heating and defrosting control method of an air conditioner according to claim 1, wherein the satisfying of the condition for entering the bypass defrosting mode specifically includes:
simultaneously, the following conditions are met:
the outdoor environment temperature is less than or equal to a first preset temperature;
the air outlet temperature is less than or equal to a second preset temperature;
the outdoor coil temperature is less than or equal to the outdoor ambient temperature.
3. The heating and defrosting control method of an air conditioner according to claim 1, further comprising the steps of:
acquiring the air inlet pressure, the air outlet pressure and the inner disc temperature of the compressor (1);
judging whether the conditions for exiting the bypass defrosting mode are met or not according to the air inlet pressure, the air outlet pressure and the inner disc temperature;
if the condition for exiting the bypass defrosting mode is met, the bypass control valve (8) is closed to exit the bypass defrosting mode.
4. The heating and defrosting control method of an air conditioner according to claim 3, wherein the condition for exiting the bypass defrosting mode is satisfied, and specifically comprises:
simultaneously, the following conditions are met:
the ratio of the outlet pressure to the inlet pressure is less than the minimum compression ratio of the compressor (1), and the inner disc temperature is greater than or equal to a third preset temperature.
5. The heating and defrosting control method of an air conditioner according to claim 4, wherein the third preset temperature is a preset inner disc temperature value when the compressor (1) is stably operated and the outdoor heat exchanger (5) is not frosted.
6. The air conditioner heating defrost control method of claim 4 or 5, wherein the minimum compression ratio of the compressor (1) and the operation frequency of the compressor (1) satisfy the following relation:
when f is more than or equal to 12 and less than or equal to 30, P0＝2/25f-2/5；
When f is more than or equal to 30, P0＝2；
Wherein, P0Is the minimum compression ratio of the compressor (1) and f is the operating frequency of the compressor (1).
7. The utility model provides an air conditioner defrosting device that heats which characterized in that includes:
the acquisition module is used for acquiring the outdoor environment temperature, the air outlet temperature and the outer disc temperature;
the processing module is used for judging whether the conditions for entering the bypass defrosting mode are met or not according to the outdoor environment temperature, the air outlet temperature and the outer disc temperature;
and the control module is used for controlling to open the bypass control valve (8) to enter the bypass defrosting mode when the condition of entering the bypass defrosting mode is met.
8. An air conditioner comprising a computer readable storage medium storing a computer program and a processor, wherein the computer program is read by the processor and executed to implement the heating and defrosting control method of the air conditioner according to any one of claims 1 to 6.
9. The air conditioner according to claim 9, further comprising:
the compressor (1), the indoor heat exchanger (3), the throttling component (4) and the outdoor heat exchanger (5) are communicated in sequence to form a refrigerant circulation loop;
the bypass loop (7) is communicated with the refrigerant circulation loop and is arranged in parallel with the throttling component (4);
and a bypass control valve (8) provided in the bypass circuit (7).
10. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program which, when read and executed by a processor, implements the air conditioner heating defrost control method of any one of claims 1-6.
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| CN115031353A (en) * | 2022-06-30 | 2022-09-09 | 海信空调有限公司 | Air conditioner and defrosting control method thereof |
| CN115031353B (en) * | 2022-06-30 | 2023-07-14 | 海信空调有限公司 | Air conditioner and defrosting control method thereof |
| CN115790055A (en) * | 2022-11-10 | 2023-03-14 | 宁波奥克斯电气股份有限公司 | Defrosting control method, control device and air conditioner |
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