CN106958926B - Air conditioner and defrosting control method thereof - Google Patents
Air conditioner and defrosting control method thereof Download PDFInfo
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- CN106958926B CN106958926B CN201710327167.2A CN201710327167A CN106958926B CN 106958926 B CN106958926 B CN 106958926B CN 201710327167 A CN201710327167 A CN 201710327167A CN 106958926 B CN106958926 B CN 106958926B
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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
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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
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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
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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- Mathematical Physics (AREA)
- Signal Processing (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention belongs to the technical field of air conditioners and aims to solve the problem that an optimal defrosting mode cannot be selected according to the external temperature condition and the frost layer thickness on an air conditioner outdoor unit when an existing air conditioner is defrosted. Therefore, the invention provides an air conditioner and a defrosting control method thereof, wherein the method comprises the following steps: comparing the outdoor ambient temperature with a first preset temperature; if the outdoor environment temperature is greater than or equal to the first preset temperature, controlling the air conditioner to bypass and defrost; if the outdoor environment temperature is lower than the first preset temperature, judging whether the thickness of a frost layer on the air conditioner outdoor unit meets a preset condition; if the thickness of the frost layer meets the preset condition, controlling the air conditioner to bypass and defrost; and if the thickness of the frost layer does not meet the preset condition, controlling the air conditioner to refrigerate and defrost. The invention can adopt the best defrosting mode under the condition that the outdoor environment temperature is higher or lower or the frost layer on the outdoor unit of the air conditioner is thicker or thinner, thereby ensuring the comfort of the indoor environment and improving the heating effect of the air conditioner.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to an air conditioner and a defrosting control method thereof.
Background
The air conditioner as a device capable of adjusting the indoor environment temperature has the working principle that: the indoor environment temperature is lowered or raised by the refrigerant switching between the circulation lines through the high pressure/low pressure/gas/liquid state, namely, the air conditioner is in the cooling or heating working condition from the perspective of the indoor unit. Under the heating condition, the outer coil of the outdoor unit (evaporator) of the air conditioner is easy to frost, and the performance of a refrigerating system is reduced due to frosting of the outer coil, so that the heating effect of the air conditioner is influenced, the comfort of the indoor environment is reduced, and the user experience is influenced. Therefore, in the case that the air conditioner is in the heating condition, the air conditioner needs to be defrosted timely and effectively.
In order to solve the problem of frosting of the air conditioner, the invention patent with the publication number of CN103486783A discloses an air conditioner system and a defrosting control method thereof. Specifically, the control method of the above patent is to perform bypass defrosting first when the air conditioner meets a defrosting condition, and then determine whether to perform tangential defrosting of the four-way valve of the air conditioner (i.e. refrigeration cycle defrosting) according to the times of the bypass defrosting and the temperature condition, thereby achieving the purpose of defrosting by switching the bypass defrosting and the refrigeration mode defrosting. However, the above control method cannot select an optimal defrosting mode according to the external temperature condition and the thickness of the frost layer on the outdoor unit of the air conditioner at the start of defrosting, and if the frost layer on the outdoor unit is thick, the frost layer cannot be removed by bypass defrosting. Moreover, the defrosting efficiency of bypass defrosting is often low, so the defrosting time is long, more electric energy is consumed, and the energy is not saved. In addition, if the frost layer on the outdoor unit is thin, the bypass defrosting also has the problem of frequent defrosting or false defrosting.
Therefore, there is a need in the art for a new defrost control method of an air conditioner to solve the above-mentioned problems.
Disclosure of Invention
In order to solve the above problems in the prior art, that is, to solve the problem that the existing air conditioner cannot select the optimal defrosting mode according to the external temperature condition and the frost layer thickness on the outdoor unit of the air conditioner during defrosting, the present invention provides a defrosting control method for an air conditioner, which comprises the following steps: when the air conditioner meets the defrosting condition, comparing the outdoor environment temperature with a first preset temperature; if the outdoor environment temperature is greater than or equal to the first preset temperature, controlling the air conditioner to execute a bypass defrosting mode; if the outdoor environment temperature is lower than the first preset temperature, judging whether the thickness of the frost layer meets the preset condition; if the thickness of the frost layer meets the preset condition, controlling the air conditioner to execute a bypass defrosting mode; and if the thickness of the frost layer does not meet the preset condition, controlling the air conditioner to execute a refrigeration and defrosting mode.
In a preferred technical solution of the above-mentioned defrosting control method, the preset condition includes determining whether a difference between a dew point temperature of outdoor ambient air and a temperature of an outdoor unit coil is less than or equal to a second preset temperature; if the difference value between the dew point temperature of the outdoor ambient air and the temperature of the outdoor unit coil is less than or equal to a second preset temperature, the thickness of the frost layer meets a preset condition; and if the difference value between the dew point temperature of the outdoor ambient air and the temperature of the outdoor unit coil is greater than a second preset temperature, the frost layer thickness does not meet the preset condition.
In a preferred technical solution of the above-mentioned defrosting control method, the defrosting control method further includes determining whether the outdoor unit coil temperature is greater than or equal to the dew point temperature of the outdoor environment air and whether the duration of the outdoor unit coil temperature being greater than or equal to the dew point temperature of the outdoor environment air reaches a first preset time during the time when the air conditioner executes the bypass defrosting mode; if the temperature of the coil of the outdoor unit is greater than or equal to the dew point temperature of the outdoor ambient air and the duration time reaches a first preset time, controlling the air conditioner to exit the bypass defrosting mode; and if the temperature of the coil of the outdoor unit is less than the dew point temperature of the outdoor environment air, or the temperature of the coil of the outdoor unit is greater than or equal to the dew point temperature of the outdoor environment air but the duration time does not reach the first preset time, controlling the air conditioner to continuously bypass the defrosting mode.
In a preferred embodiment of the above-described defrosting control method, the defrosting control method further includes: judging whether the thickness of a frost layer meets a preset condition or not during the air conditioner executes a refrigeration defrosting mode; if the thickness of the frost layer meets the preset condition, controlling the air conditioner to be switched into a bypass defrosting mode; and if the thickness of the frost layer does not meet the preset condition, controlling the air conditioner to continuously refrigerate and defrost.
In a preferred technical scheme of the defrosting control method, the air conditioner enters/exits a bypass defrosting mode by controlling the opening/closing of a bypass valve of the air conditioner, and the frequency of a compressor of the air conditioner is increased when the bypass defrosting mode is entered; the compressor of the air conditioner is controlled to be down-clocked when the bypass defrost mode is exited.
In the preferred technical scheme of the defrosting control method, the air conditioner is enabled to enter/exit a refrigeration and defrosting mode by controlling a four-way valve of the air conditioner to change direction, and a bypass valve is closed and an indoor unit of the air conditioner is controlled to stop when the air conditioner enters the refrigeration and defrosting mode; and when the refrigeration and defrosting mode is exited, the bypass valve is opened and the indoor unit of the air conditioner is controlled to be started.
In a preferred embodiment of the above-described defrosting control method, the defrosting condition of the air conditioner includes: during the heating cycle of the air conditioner, the temperature of the outdoor unit coil is less than the dew point temperature of the outdoor environment air, and the duration that the temperature of the outdoor unit coil is less than the dew point temperature of the outdoor environment air reaches a second preset time.
In a preferred embodiment of the above defrosting control method, the first preset temperature is 0 ℃.
In a preferred embodiment of the above defrosting control method, the second preset temperature is 3 ℃.
In another aspect, the present invention provides an air conditioner, the air conditioner includes a compressor, an outdoor unit of the air conditioner, an indoor unit of the air conditioner, and a four-way valve, the compressor, the outdoor unit of the air conditioner, and the indoor unit of the air conditioner are sequentially connected to form a closed loop, the four-way valve enables the air conditioner to be in a cooling or heating working condition by a reversing manner, the air conditioner further includes: the bypass loop is arranged between the compressor and the outdoor unit of the air conditioner, and a bypass valve is arranged on the bypass loop; a control section capable of opening/closing the bypass valve and/or reversing the four-way valve by using any one of the above-described defrosting control methods.
It can be understood by those skilled in the art that, in the preferred embodiment of the present invention, when the air conditioner starts defrosting, by determining the outdoor environment temperature, the bypass defrosting is directly selected when the outdoor environment temperature is greater than or equal to 0 ℃, and the difference temperature between the dew point temperature of the outdoor environment air and the outdoor unit coil temperature is further determined when the outdoor environment temperature is less than 0 ℃, and when the difference temperature is less than or equal to 3 ℃, the frost layer on the outdoor unit of the air conditioner can be determined to be thin, the bypass defrosting mode should be adopted, and when the difference temperature is greater than 3 ℃, the frost layer on the outdoor unit of the air conditioner can be determined to be thick, and the bypass defrosting mode cannot completely remove the frost layer, and the refrigeration defrosting mode should be adopted. In the control method, the optimal defrosting mode can be selected by judging different temperature conditions, the problem of frequent defrosting or false defrosting can be avoided when the frost layer on the air conditioner outdoor unit is thin, and the frost layer can be quickly removed through refrigeration cycle when the frost layer on the air conditioner outdoor unit is thick. Therefore, the invention can adopt the best defrosting mode no matter the outdoor environment temperature is higher or lower, or the frost layer on the outdoor unit of the air conditioner is thicker or thinner, thereby ensuring the comfort of the indoor environment and improving the heating effect of the air conditioner.
Drawings
Fig. 1 is a flowchart of a defrost control method of an air conditioner of the present invention;
fig. 2 is a schematic structural view of an air conditioner of the present invention.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
It should be noted that the terms "first" and "second" are used in the description of the present invention for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Based on the problem that the prior air conditioner can not select the optimal defrosting mode according to the external temperature condition and the thickness of the frost layer on the air conditioner outdoor unit during defrosting, the invention provides the control method for defrosting the air conditioner, aiming at enabling the air conditioner to select the optimal defrosting mode according to the outdoor environment temperature and the thickness of the frost layer on the air conditioner outdoor unit, thereby ensuring the comfort of the indoor environment and improving the heating effect of the air conditioner.
Referring to fig. 1 and 2, fig. 1 is a flowchart of a defrosting control method of an air conditioner of the present invention, and fig. 2 is a schematic structural view of the air conditioner of the present invention. As shown in fig. 2, the air conditioner includes an outdoor unit 1, an indoor unit 2, a compressor 4 and a four-way valve 5, the compressor 4, the outdoor unit 1 and the indoor unit 2 are sequentially connected to form a closed loop (i.e. a cooling/heating circulation loop of the air conditioner), the four-way valve 5 can make the air conditioner in a cooling or heating condition by reversing, and the air conditioner further includes: a bypass circuit provided between the compressor 4 and the outdoor unit 2 and having a bypass valve 3; and a control section capable of opening/closing the bypass valve 3 and/or reversing the four-way valve 5. As shown in fig. 1, the defrosting control method of the present invention includes the steps of: s1: when the air conditioner meets the defrosting condition, comparing the outdoor environment temperature with a first preset temperature; s2: if the outdoor environment temperature is greater than or equal to the first preset temperature, controlling the air conditioner to execute a bypass defrosting mode; s3: if the outdoor environment temperature is lower than the first preset temperature, judging whether the thickness of a frost layer on the air conditioner outdoor unit 1 meets a preset condition; s4: if the thickness of the frost layer on the air conditioner outdoor unit 1 meets the preset condition, controlling the air conditioner to execute a bypass defrosting mode (a single lead-out loop); s5: and if the thickness of the frost layer on the air conditioner outdoor unit 1 does not meet the preset condition, controlling the air conditioner to execute a refrigeration defrosting mode (reverse cycle defrosting).
Through the setting of the first preset temperature, a conclusion whether the bypass defrosting mode is executed or not can be preliminarily given. The first preset temperature can be flexibly adjusted and set according to actual conditions, and the defrosting control method can be optimized as long as the demarcation point of the defrosting condition determined by the first preset temperature is met. By setting the preset condition of the frost thickness, a conclusion can be further given as to whether the bypass defrosting mode or the cooling defrosting mode is performed. Similarly, the preset condition of the frost layer thickness can be flexibly adjusted and set according to the actual situation as long as the defrosting control method can be optimized by meeting the demarcation point of the defrosting condition determined by the preset condition of the frost layer thickness.
In a possible embodiment, the first preset temperature may be 0 ℃, that is, when the outdoor ambient temperature is greater than or equal to 0 ℃, the outdoor ambient temperature may be considered to be higher, and the air conditioner directly selects the bypass defrosting. When the outdoor environment temperature is less than 0 ℃, the outdoor environment temperature is considered to be low, and whether the frost thickness on the outdoor unit 1 of the air conditioner meets the preset condition needs to be further judged. Obviously, the first preset temperature is not limited to 0 ℃ due to the change of seasons and the change of weather, and can be adjusted according to practical situations.
In one possible embodiment, the predetermined condition for the thickness of the frost layer can be determined by: judging whether the difference between the dew point temperature of the outdoor ambient air and the temperature of an external coil of the outdoor unit (coil of the outdoor unit) is less than or equal to a second preset temperature or not; if the difference between the dew point temperature of the outdoor ambient air and the temperature of the outdoor unit coil is less than or equal to a second preset temperature, the frost layer thickness is considered to meet a preset condition; and if the difference value between the dew point temperature of the outdoor environment air and the temperature of the outdoor unit coil is greater than a second preset temperature, the frost layer thickness is considered not to meet the preset condition. By judging different temperature conditions, an optimal defrosting mode can be selected. Through repeated experiments, observations and comparisons of the inventor, under the condition of adopting the judgment mode, especially when the frost layer on the outdoor unit coil is thin, the problem of frequent defrosting or false defrosting can be effectively avoided by introducing the second preset temperature. When the frost layer on the coil pipe of the outdoor unit is thick, the frost layer can be quickly removed completely through a refrigeration cycle defrosting mode by introducing a second preset temperature, and compared with the existing defrosting scheme that the air conditioner firstly adopts bypass defrosting and then adopts refrigeration cycle defrosting, the defrosting method directly adopts refrigeration cycle defrosting under the condition that the frost layer is thick, so that the defrosting time is short, electricity is saved, and energy is saved. Of course, the second preset temperature can be flexibly adjusted and set according to actual conditions, as long as the defrosting control method can be optimized by meeting the demarcation point of the defrosting condition determined by the second preset temperature. Moreover, the preset condition of the frost layer thickness is not limited to the above determination method, for example, in addition to the dew point temperature and the outdoor unit coil temperature, conditions such as the attenuation speed of the outdoor unit coil temperature and/or the relative humidity of air may be replaced or added to determine the frost layer thickness, or the frost layer thickness of the air-conditioning outdoor unit 1 may be directly observed and determined through experience, or the frost layer thickness of the air-conditioning outdoor unit 1 may be determined by introducing an image acquisition device, and defrosting is performed when a certain thickness is reached.
In a possible embodiment, the second preset temperature may be 3 ℃, and when the difference temperature between the dew point temperature of the outdoor ambient air and the temperature of the outdoor unit coil is less than or equal to 3 ℃, it may be determined that the frost layer on the outdoor unit 1 of the air conditioner is thin, and the bypass defrosting mode should be adopted. When the difference temperature is higher than 3 ℃, it can be judged that the frost layer on the air conditioner outdoor unit 1 is thick, the frost layer cannot be completely removed by adopting the bypass defrosting mode, and the refrigeration defrosting mode should be adopted. Similarly, the second preset temperature is not limited to 3 ℃ due to seasonal variation factors, weather variation factors or other condition factors of the air conditioner (such as the service life of the air conditioner, the amount of refrigerant circulating in the air conditioner, etc.), and can be adjusted according to actual conditions.
Preferably, before the air conditioner enters the defrosting mode, the defrosting control method may further include the step of determining whether a defrosting condition is satisfied. Preferably, the defrosting conditions may be: and judging whether the temperature of the coil of the outdoor unit is less than the dew point temperature of the outdoor environment air or not and whether the duration time of the temperature of the coil of the outdoor unit less than the dew point temperature of the outdoor environment air reaches a second preset time or not when the air conditioner is in the heating working condition. If the temperature of the coil of the outdoor unit is less than the dew point temperature of the outdoor environment air and the duration time reaches a second preset time, the air conditioner meets the defrosting condition, and the steps S1-S5 are carried out; if the temperature of the outdoor unit coil is greater than or equal to the dew point temperature of the outdoor environment air, or the temperature of the outdoor unit coil is less than the dew point temperature of the outdoor environment air but the duration time does not reach the second preset time, the air conditioner does not meet the defrosting condition and does not defrost. The second preset time can be flexibly adjusted and set according to actual conditions, and the defrosting control method can be optimized as long as the demarcation point of the defrosting condition determined by the second preset time is met. In one embodiment of the present invention, T may be usedes＝C*Taoα to calculate the dew point temperature T of the ambient airesWherein, TaoFor an outdoor environmentThe temperature, C is a coefficient and α is a constant, and the coefficient C and the constant α may be obtained by any suitable means, such as experimentation, mathematical modeling, and the like.
In a possible embodiment, the second preset time may be 2min, that is, when determining whether the air conditioner satisfies the defrosting condition, it is determined whether the duration time that the temperature of the coil of the outdoor unit is less than the dew point temperature reaches 2min, and of course, the second preset time is not limited to 2min and may be adjusted and set according to actual situations. Meanwhile, the defrosting condition is not limited to the above determination method, and in practical applications, other determination methods may also be adopted, for example, the determination is performed according to the temperature decay speed of the outdoor unit coil or the determination is performed according to the relative humidity of the air, and details are not described herein again.
When the defrosting control method of the air conditioner is adopted, after the air conditioner runs for a period of time in a starting heating mode, the temperature sensor is controlled to detect the outdoor environment temperature and the outdoor unit coil temperature, the dew point temperature of the outdoor environment air is obtained, and then whether the outdoor environment temperature is greater than or equal to 0 ℃ is judged.
If the outdoor environment temperature is greater than or equal to 0 ℃, the outdoor environment temperature is higher, the air conditioner directly selects bypass defrosting, namely, the air conditioner enters a bypass defrosting mode. In a specific embodiment, corresponding to the configuration of fig. 2, the air conditioner is controlled to open the bypass valve 3. In order to ensure that the indoor temperature is kept constant basically in the defrosting process, the compressor 4 can be controlled to increase the frequency, after the air conditioner is defrosted for a period of time, the temperature sensor is continuously or intermittently controlled to detect the temperature of the coil pipe of the outdoor unit, whether the temperature of the coil pipe of the outdoor unit is greater than or equal to the dew point temperature of the outdoor environment air or not is judged, and whether the duration time that the temperature of the coil pipe is greater than or equal to the dew point temperature reaches a first preset time or not is judged; if the outdoor unit coil temperature is greater than or equal to the dew point temperature of the outdoor ambient air and the duration reaches the first preset time, the air conditioner is controlled to exit the bypass defrost mode, corresponding to the configuration of fig. 2, where the bypass valve 3 should be controlled to be closed, and the compressor 4 should be controlled to be down-clocked. If the temperature of the coil of the outdoor unit is less than the dew point temperature of the outdoor environment air, or the temperature of the coil of the outdoor unit is greater than or equal to the dew point temperature of the outdoor environment air but the duration time does not reach the first preset time, the air conditioner continues to perform the bypass defrosting mode. The first preset time may be 1min, that is, when the thickness of the frost layer is determined, it is determined whether the duration of the temperature of the coil of the outdoor unit being greater than or equal to the dew point temperature of the outdoor ambient air reaches 1min, and of course, the first preset time is not limited to 1min, and may be adjusted and set according to actual conditions, as long as the defrosting control method can be optimized at the boundary point that meets the defrosting condition determined by the first preset time.
If the outdoor environment temperature is less than 0 ℃, it indicates that the outdoor environment temperature is low at this time, the frost layer thickness on the outdoor unit 1 of the air conditioner needs to be further judged, and the frost layer thickness on the outdoor unit 1 of the air conditioner is judged by judging whether the difference between the dew point temperature of the outdoor environment air and the temperature of the coil pipe of the outdoor unit is less than or equal to 3 ℃.
If the difference temperature is less than or equal to 3 ℃, the frost layer on the air conditioner outdoor unit 1 is thin, defrosting can be performed through a bypass defrosting mode, at the moment, the air conditioner enters the bypass defrosting mode, the air conditioner is controlled to open the bypass valve 3, and the compressor 4 is controlled to increase the frequency in order to ensure that the indoor temperature is basically kept constant in the defrosting process. After the air conditioner is defrosted for a period of time, the temperature sensor is controlled to detect the temperature of the coil of the outdoor unit, and whether the temperature of the coil of the outdoor unit is larger than or equal to the dew point temperature of the outdoor environment air or not and whether the duration time of the temperature of the coil of the outdoor unit, which is larger than or equal to the dew point temperature of the outdoor environment air, reaches a first preset time or not are judged. If the outdoor unit coil temperature is greater than or equal to the dew point temperature of the outdoor ambient air and the duration reaches the first preset time, the air conditioner is controlled to exit the bypass defrost mode, and the bypass valve 3 should be controlled to be closed, and the compressor 4 should be controlled to be down-clocked, corresponding to the configuration of fig. 2. If the temperature of the coil of the outdoor unit is less than the dew point temperature of the outdoor environment air, or the temperature of the coil of the outdoor unit is greater than or equal to the dew point temperature of the outdoor environment air but the duration time does not reach the first preset time, the air conditioner continues to perform the bypass defrosting mode. Similarly, the first preset time may be adjusted and set according to actual conditions.
If the difference value is greater than 3 ℃, it indicates that the frost layer on the air conditioner outdoor unit 1 is thick, the frost layer cannot be completely removed by adopting the bypass defrosting mode, the refrigeration defrosting mode should be adopted, and corresponding to the structure of fig. 2, at this time, the air conditioner should be controlled to enter the refrigeration defrosting mode, the four-way valve 5 of the air conditioner should be controlled to reverse (the air conditioner is switched from the heating mode to the refrigeration mode), the bypass valve 3 is closed, and the indoor unit 2 of the air conditioner is controlled to stop, so that the air conditioner can defrost in the refrigeration mode by the refrigerant in a reverse circulation manner. During the refrigeration and defrosting of the air conditioner, continuously or intermittently controlling a temperature sensor to detect the temperature of the coil pipe of the outdoor unit, and judging whether the difference between the dew point temperature of the outdoor environment air and the temperature of the coil pipe of the outdoor unit is less than or equal to 3 ℃; if the difference between the dew point temperature of the outdoor environment air and the temperature of the coil of the outdoor unit is less than or equal to 3 ℃, the air conditioner is controlled to exit the refrigeration and defrosting mode, corresponding to the structure of fig. 2, the four-way valve 5 is controlled to change the direction, the bypass valve 3 is opened (the air conditioner is switched from the refrigeration and defrosting mode to the bypass defrosting mode), and the indoor unit 2 of the air conditioner is controlled to be opened, and the air conditioner performs the bypass defrosting mode. And if the difference between the dew point temperature of the outdoor environment air and the temperature of the outdoor unit coil is more than 3 ℃, controlling the air conditioner to continuously carry out a refrigeration and defrosting mode.
In the defrosting control method of the present invention, no matter the air conditioner directly enters the bypass defrosting mode or the air conditioner is switched from the refrigerating defrosting mode to the bypass defrosting mode, in order to ensure that the indoor environment temperature is not affected during the bypass defrosting of the air conditioner, the compressor 4 needs to be controlled to perform the frequency-up operation. In an embodiment of the present invention, the frequency of the compressor 4 after the frequency boost can be calculated by using the formula f2 ═ K × f1+ b, where f1 is the frequency of the compressor 4 before the frequency boost of the compressor 4, i.e., the frequency of the compressor 4 before the air conditioner enters the bypass defrosting mode, f2 is the frequency of the compressor 4 after the frequency boost of the compressor 4, i.e., the frequency of the compressor 4 during the time when the air conditioner performs the bypass defrosting mode, K is the external environment temperature coefficient, and b is a constant, and the coefficient K and the constant b can be obtained by any suitable method, such as experiment, mathematical modeling, and the like.
It can be seen that, by adopting the defrosting control method of the invention, the air conditioner can be in a non-stop state all the time during the time when the air conditioner performs the bypass defrosting, thereby ensuring that the indoor environment temperature is basically kept unchanged during the bypass defrosting of the air conditioner, ensuring the comfort of the indoor environment, improving the heating effect of the air conditioner, and effectively realizing the defrosting of the air conditioner on the premise of not sacrificing the user experience as much as possible. And during the refrigeration defrosting of the air conditioner, on the premise of sacrificing the user experience as little as possible, the thorough defrosting is rapidly realized. The phenomenon that the refrigerating performance of the air conditioner is deteriorated due to incomplete defrosting or overlong defrosting time is avoided, and therefore the operation reliability of the air conditioner is guaranteed.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. A defrosting control method of an air conditioner, characterized by comprising the steps of:
when the air conditioner meets the defrosting condition, comparing the outdoor environment temperature with a first preset temperature;
if the outdoor environment temperature is greater than or equal to the first preset temperature, controlling the air conditioner to execute a bypass defrosting mode;
if the outdoor environment temperature is lower than the first preset temperature, judging whether the thickness of the frost layer meets the preset condition;
if the thickness of the frost layer meets the preset condition, controlling the air conditioner to execute a bypass defrosting mode;
and if the thickness of the frost layer does not meet the preset condition, controlling the air conditioner to execute a refrigeration and defrosting mode.
2. The defrost control method of claim 1, wherein the preset conditions include:
judging whether the difference between the dew point temperature of the outdoor ambient air and the temperature of the outdoor unit coil is less than or equal to a second preset temperature or not;
if the difference value between the dew point temperature of the outdoor environment air and the temperature of the outdoor unit coil is less than or equal to a second preset temperature, the frost layer thickness meets the preset condition;
and if the difference value between the dew point temperature of the outdoor environment air and the temperature of the outdoor unit coil is greater than a second preset temperature, the frost layer thickness does not meet the preset condition.
3. The defrost control method of claim 2, further comprising:
during the air conditioner executes the bypass defrosting mode, judging whether the temperature of the coil of the outdoor unit is greater than or equal to the dew point temperature of the outdoor environment air or not, and whether the duration time of the temperature of the coil of the outdoor unit which is greater than or equal to the dew point temperature of the outdoor environment air reaches a first preset time or not;
if the temperature of the coil of the outdoor unit is greater than or equal to the dew point temperature of the outdoor ambient air and the duration time reaches a first preset time, controlling the air conditioner to exit the bypass defrosting mode;
and if the temperature of the coil of the outdoor unit is less than the dew point temperature of the outdoor environment air, or the temperature of the coil of the outdoor unit is greater than or equal to the dew point temperature of the outdoor environment air but the duration time does not reach the first preset time, controlling the air conditioner to continuously bypass the defrosting mode.
4. The defrost control method of claim 2, further comprising:
judging whether the thickness of a frost layer meets the preset condition or not during the air conditioner executes a refrigeration defrosting mode;
if the thickness of the frost layer meets the preset condition, controlling the air conditioner to be switched into a bypass defrosting mode;
and if the thickness of the frost layer does not meet the preset condition, controlling the air conditioner to continuously refrigerate and defrost.
5. The defrosting control method according to any one of claims 1 to 4, wherein the air conditioner is caused to enter/exit the bypass defrosting mode by controlling a bypass valve of the air conditioner to be opened/closed, and
controlling a compressor of the air conditioner to increase frequency when entering a bypass defrosting mode;
the compressor of the air conditioner is controlled to be down-clocked when the bypass defrost mode is exited.
6. The defrost control method of any one of claims 1 to 4, wherein the air conditioner is entered/exited into the cooling defrost mode by controlling a four-way valve of the air conditioner to be reversed, and
when entering a refrigeration and defrosting mode, closing the bypass valve and controlling the air conditioner indoor unit to stop;
and when the refrigeration and defrosting mode is exited, the bypass valve is opened and the indoor unit of the air conditioner is controlled to be started.
7. The defrost control method of claim 1, wherein the defrost condition of the air conditioner comprises:
during the heating cycle of the air conditioner, the temperature of the outdoor unit coil is less than the dew point temperature of the outdoor environment air, and the duration that the temperature of the outdoor unit coil is less than the dew point temperature of the outdoor environment air reaches a second preset time.
8. Defrost control method according to any of the claims 1-4, characterized in that the first preset temperature is 0 ℃.
9. Defrost control method according to any of the claims 2-4, characterized in that the second preset temperature is 3 ℃.
10. The utility model provides an air conditioner, air conditioner includes compressor, air condensing units, machine and cross valve in the air conditioning, the compressor the air condensing units with machine links to each other in proper order in the air conditioning forms the closed loop, the cross valve can make through the mode of switching-over the air conditioner is in refrigeration or heating operating mode, its characterized in that, air conditioner still includes:
a bypass circuit disposed between the compressor and the outdoor unit of the air conditioner, the bypass circuit having a bypass valve disposed thereon;
a control portion capable of opening/closing the bypass valve and/or reversing the four-way valve by the defrosting control method according to any one of claims 1 to 9.
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Effective date of registration: 20200914 Address after: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Co-patentee after: QINGDAO HAIER (JIAOZHOU) AIR CONDITIONER Co.,Ltd. Patentee after: QINGDAO HAIER AIR CONDITIONER GENERAL Corp.,Ltd. Address before: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Patentee before: QINGDAO HAIER AIR CONDITIONER GENERAL Corp.,Ltd. |
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Effective date of registration: 20201102 Address after: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Patentee after: QINGDAO HAIER AIR CONDITIONER GENERAL Corp.,Ltd. Patentee after: QINGDAO HAIER (JIAOZHOU) AIR CONDITIONER Co.,Ltd. Patentee after: Haier Zhijia Co.,Ltd. Address before: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Patentee before: QINGDAO HAIER AIR CONDITIONER GENERAL Corp.,Ltd. Patentee before: QINGDAO HAIER (JIAOZHOU) AIR CONDITIONER Co.,Ltd. |
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