CN108332351B - Refrigeration control method and system - Google Patents

Refrigeration control method and system Download PDF

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Publication number
CN108332351B
CN108332351B CN201810181553.XA CN201810181553A CN108332351B CN 108332351 B CN108332351 B CN 108332351B CN 201810181553 A CN201810181553 A CN 201810181553A CN 108332351 B CN108332351 B CN 108332351B
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Prior art keywords
temperature
compressor
frequency
evaporator
preset
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CN108332351A (en
Inventor
方宁
古汤汤
吴小毛
陈冬
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Aux Air Conditioning Co Ltd
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Aux Air Conditioning Co Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/30Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/62Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63Electronic processing
    • F24F11/64Electronic processing using pre-stored data
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/70Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/86Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00Control inputs relating to air properties
    • F24F2110/10Temperature
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00Control inputs relating to air properties
    • F24F2110/10Temperature
    • F24F2110/12Temperature of the outside air

Abstract

The invention provides a refrigeration control method and a refrigeration control system, which are used for preventing an air conditioner from blowing water at high temperature and high humidity during refrigeration operation, and the refrigeration control method comprises the following steps: obtaining an indoor ambient temperature detected by a first temperature sensor, an evaporator temperature detected by a second temperature sensor and an operating frequency of a compressor of the air conditioner; and when the difference value between the indoor environment temperature and the evaporator temperature is lower than a preset first temperature difference threshold value and the compressor is not in low-frequency operation, reducing the frequency of the compressor so as to keep the indoor environment temperature and the evaporator temperature within a preset temperature difference range. The refrigeration control method and the refrigeration control system can keep the indoor environment temperature and the evaporator temperature within a preset temperature difference range, and avoid the phenomenon of high-temperature high-humidity water blowing during the refrigeration operation of the air conditioner.

Description

Refrigeration control method and system
Technical Field
The invention relates to the field of air conditioners, in particular to a refrigeration control method and a refrigeration control system.
Background
At present, through the frequency conversion air conditioner of capillary throttle, when the operation refrigerates under the environment of high temperature and high humidity, because the evaporimeter load is higher, the refrigerant has evaporated completely when the evaporimeter front portion flow path of flowing through to the gaseous state, evaporimeter rear portion shunt passage is seriously overheated, the air is through cold and hot uneven evaporimeter heat transfer back, can form cold and hot air in the built-in wind channel and intersect, the wind channel produces a large amount of condensation water and finally blows off from the wind channel in the short time, user's use experience has greatly been influenced.
Disclosure of Invention
In view of the above, the present invention is directed to a refrigeration control method and system for preventing the air conditioner from blowing water at high temperature and high humidity during the refrigeration operation.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a refrigeration control method for preventing an air conditioner from blowing water at high temperature and high humidity during a refrigeration operation, the method comprising:
obtaining an indoor ambient temperature detected by a first temperature sensor, an evaporator temperature detected by a second temperature sensor and an operating frequency of a compressor of the air conditioner;
and when the difference value between the indoor environment temperature and the evaporator temperature is lower than a preset first temperature difference threshold value and the compressor is not in low-frequency operation, reducing the frequency of the compressor so as to keep the indoor environment temperature and the evaporator temperature within a preset temperature difference range.
Further, the method further comprises:
obtaining the outdoor environment temperature detected by a third temperature sensor;
the reducing the frequency of the compressor when the difference between the indoor ambient temperature and the evaporator temperature is below the first temperature difference threshold and the compressor is not in low frequency operation comprises:
and when the difference value between the indoor environment temperature and the evaporator temperature is lower than the first temperature difference threshold value, the compressor is not in low-frequency operation, and the outdoor environment temperature is in a preset temperature range, the frequency of the compressor is reduced.
Further, when the difference between the indoor ambient temperature and the evaporator temperature is lower than the first temperature difference threshold, the compressor is not in low-frequency operation, and the outdoor ambient temperature is within a preset temperature range, reducing the frequency of the compressor, including:
when the difference between the indoor environment temperature and the evaporator temperature is lower than the first temperature difference threshold value, the running frequency of the compressor is higher than a preset first preset frequency, and the outdoor environment temperature is in the temperature range, the frequency of the compressor is reduced.
Further, when the difference between the indoor ambient temperature and the evaporator temperature is lower than the first temperature difference threshold, the compressor is not in low-frequency operation, and the outdoor ambient temperature is within a preset temperature range, reducing the frequency of the compressor, including:
when the difference between the indoor ambient temperature and the evaporator temperature is less than the first temperature difference threshold, the operating frequency of the compressor is within a normal logic frequency range, and the outdoor ambient temperature is within the temperature range, the frequency of the compressor is reduced.
Further, after reducing the frequency of the compressor, the method further comprises:
and when the difference value between the indoor environment temperature and the evaporator temperature is higher than a preset second temperature difference threshold value, or after the compressor continuously operates for a preset time period, or the operating frequency of the compressor is lower than a preset second preset frequency, controlling the compressor to operate at a rated frequency.
Compared with the prior art, the refrigeration control method has the following advantages:
(1) the refrigeration control method can judge the environment humidity of the running air conditioner according to the indoor environment temperature and the evaporator temperature, and can avoid serious overheating of the evaporator and prevent high-temperature high-humidity water blowing if the environment is a high-humidity environment by optimizing the frequency control of the compressor.
Another objective of the present invention is to provide a refrigeration control system to prevent the air conditioner from blowing water at high temperature and high humidity during the refrigeration operation.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a refrigeration control system is applied to an air conditioner and comprises a controller, an evaporator, a first temperature sensor, a second temperature sensor and a compressor, wherein the controller is electrically connected with the evaporator, the first temperature sensor, the second temperature sensor and the compressor respectively;
the first temperature sensor is used for detecting the indoor environment temperature, the second temperature sensor is used for detecting the evaporator temperature of the evaporator, the controller is used for working as the difference between the indoor environment temperature and the evaporator temperature is lower than a preset first temperature difference threshold value, and the compressor is not in low-frequency operation, the frequency of the compressor is reduced, so that the indoor environment temperature and the evaporator temperature are kept in a preset temperature difference range.
Further, the refrigeration control system further comprises a third temperature sensor, the third temperature sensor is used for detecting the outdoor environment temperature, and the controller is used for reducing the frequency of the compressor when the difference value between the indoor environment temperature and the evaporator temperature is lower than the first temperature difference threshold value, the compressor is not in low-frequency operation, and the outdoor environment temperature is in a preset temperature range.
Further, the controller is configured to reduce the frequency of the compressor when the difference between the indoor ambient temperature and the evaporator temperature is lower than the first temperature difference threshold, the operating frequency of the compressor is higher than a first preset frequency, and the outdoor ambient temperature is within the temperature range.
Further, the controller is configured to decrease the frequency of the compressor when the difference between the indoor ambient temperature and the evaporator temperature is less than the first temperature difference threshold, the operating frequency of the compressor is within a normal logic frequency range, and the outdoor ambient temperature is within the temperature range.
Further, after the frequency of the compressor is reduced, the controller is further configured to control the compressor to operate at a rated frequency when a difference between the indoor ambient temperature and the evaporator temperature is higher than a second predetermined temperature difference threshold, or the compressor continues to operate for a predetermined period of time, or the operating frequency of the compressor is lower than a second predetermined frequency.
Compared with the prior art, the refrigeration control system has the following advantages:
(1) the refrigeration control system can judge the environment humidity of the running air conditioner according to the indoor environment temperature and the evaporator temperature, and can avoid serious overheating of the evaporator and prevent high-temperature high-humidity water blowing if the environment is a high-humidity environment through optimizing the frequency control of the compressor.
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 block schematic diagram of a refrigeration control system according to a first embodiment of the present invention;
FIG. 2 is a block schematic diagram of another refrigeration control system according to a first embodiment of the present invention;
fig. 3 is a flowchart of a refrigeration control method according to a second embodiment of the invention;
fig. 4 is a flowchart of another refrigeration control method according to a second embodiment of the present invention.
Description of reference numerals:
1-controller, 2-evaporator, 3-first temperature sensor, 4-second temperature sensor, 5-compressor, 6-third temperature sensor.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
First embodiment
Referring to fig. 1, a block diagram of a refrigeration control system according to a preferred embodiment of the present invention is shown, the refrigeration control system is applied to an air conditioner, the refrigeration control system includes a controller 1, an evaporator 2, a first temperature sensor 3, a second temperature sensor 4, and a compressor 5, and the controller 1 is electrically connected to the evaporator 2, the first temperature sensor 3, the second temperature sensor 4, and the compressor 5 respectively for signal interaction. The controller 1 is a main control panel of an air conditioner.
The first temperature sensor 3 is used for detecting the indoor environment temperature, the second temperature sensor 4 is used for detecting the evaporator temperature of the evaporator 2, and the controller 1 is used for reducing the frequency of the compressor 5 when the difference value between the indoor environment temperature and the evaporator temperature is lower than a preset first temperature difference threshold value and the compressor 5 is not in low-frequency operation, so that the indoor environment temperature and the evaporator temperature are kept in a preset temperature difference range.
Specifically, the first temperature sensor 3 is disposed in a room where the air conditioner is installed, and is configured to detect an indoor ambient temperature where the air conditioner is installed and feed back the detected indoor ambient temperature to the controller 1. The second temperature sensor 4 is disposed in the coil of the evaporator 2, and is configured to detect a coil temperature in the evaporator 2 (i.e., an evaporator temperature) and feed back the detected coil temperature to the controller 1. Meanwhile, the main control board can obtain the current operating frequency of the compressor 5 according to the power supply frequency of the compressor 5.
When the air conditioner is started, the controller 1 obtains the indoor ambient temperature detected by the first temperature sensor 3, the evaporator temperature detected by the second temperature sensor 4, and the operating frequency of the compressor 5. The controller 1 is preset with a first temperature difference threshold value for indicating whether the difference between the indoor environment temperature and the evaporator temperature is too large, and after the controller 1 obtains the indoor environment temperature, the evaporator temperature and the operation frequency of the compressor 5, whether the difference between the indoor environment temperature and the evaporator temperature is lower than the preset first temperature difference threshold value or not is judged, and whether the compressor 5 operates at a low frequency or not is judged. If the difference between the indoor environment temperature and the evaporator temperature is lower than the preset first temperature difference threshold value, and the compressor 5 is not in the low-frequency operation, it indicates that the temperature difference value between the current indoor environment temperature and the evaporator temperature is too small, the evaporator is internally provided with a high-humidity environment, the air conditioner can be caused to generate the high-temperature high-humidity water blowing phenomenon, and the current compressor 5 can reduce the frequency, at the moment, the controller 1 controls the compressor 5 to reduce the operation frequency to avoid serious overheating of the evaporator, so that the indoor environment temperature and the evaporator temperature are kept in the preset temperature difference range, and the high-temperature high-humidity water blowing phenomenon is prevented from occurring when the air conditioner operates in the refrigeration mode.
In the embodiment of the present invention, the difference between the indoor ambient temperature and the evaporator temperature is a value obtained by subtracting the evaporator temperature from the indoor ambient temperature. The first temperature difference threshold may be set according to specific conditions, and according to a plurality of tests performed by the inventor, the first temperature difference threshold is preferably 10 ℃ or slightly less than 10 ℃, for example, 8 ℃, 9 ℃, etc.
Before the air conditioner is turned on, the indoor ambient temperature is approximately equal to the evaporator temperature, and when the air conditioner is turned on, the evaporator temperature gradually decreases, and the difference between the indoor ambient temperature and the evaporator temperature gradually increases. When the air conditioner is just started to refrigerate and run, the difference value between the indoor environment temperature and the evaporator temperature is smaller than the first temperature difference threshold value, but the high-temperature high-humidity water blowing phenomenon cannot be generated. Therefore, in order to eliminate the error control of the controller 1 during a period of time when the air conditioner is just turned on, in the embodiment of the present invention, after the air conditioner is turned on for cooling operation for a period of time and the evaporator temperature and the indoor ambient temperature tend to be stable, the controller 1 determines whether the difference between the indoor ambient temperature and the evaporator temperature is lower than a preset first temperature difference threshold, and whether the compressor 5 is in low-frequency operation. The time period of the operation can be set according to actual conditions.
In the embodiment of the present invention, the fact that the compressor 5 is not in the low-frequency operation may mean that the operation frequency of the compressor 5 is higher than a preset first preset frequency, or may mean that the operation frequency of the compressor 5 is within a normal logical frequency range, where the normal logical frequency range refers to an operation frequency range in which the compressor 5 is normally operated.
When the outdoor ambient temperature is too high or too low, the difference between the indoor ambient temperature and the evaporator temperature is affected by the too high or too low outdoor ambient temperature, so that the difference between the indoor ambient temperature and the evaporator temperature is too low. To eliminate the influence, referring to fig. 2, the refrigeration control system according to the embodiment of the present invention further includes a third temperature sensor 6, where the third temperature sensor 6 is electrically connected to the controller 1, and the third temperature sensor 6 is disposed outdoors and used for detecting an outdoor ambient temperature. The controller 1 is configured to control the compressor 5 to reduce the frequency to operate to avoid overheating of the evaporator when the difference between the indoor ambient temperature and the evaporator temperature is lower than the first temperature difference threshold, the compressor 5 is not in low-frequency operation, and the outdoor ambient temperature is within a preset temperature range, so that the indoor ambient temperature and the evaporator temperature are maintained within the preset temperature difference range, and therefore the air conditioner is prevented from generating a high-temperature high-humidity water blowing phenomenon during the cooling operation.
In the embodiment of the invention, the preset temperature range is approximately between 25 and 40 ℃, and can be adjusted correspondingly according to actual conditions.
In the embodiment of the present invention, the controller 1 controls the compressor 5 to operate at a reduced frequency, but the compressor 5 is controlled to operate at a frequency obtained by multiplying the original operating frequency by a proportionality coefficient smaller than 1, or to operate at a frequency subtracted from the original operating frequency, or to operate at a fixed lower frequency, which is not limited in this embodiment.
Further, when the compressor 5 operates at a low frequency, the difference between the indoor ambient temperature and the evaporator temperature is gradually increased, so that the high-temperature high-humidity water blowing phenomenon of the air conditioner is eliminated, and the air conditioner needs to be adjusted to operate at a normal frequency to ensure the refrigeration effect of the air conditioner. Based on this, the controller 1 provided in the embodiment of the present invention is further configured to control the compressor 5 to operate at the rated frequency when the difference between the indoor ambient temperature and the evaporator temperature is higher than a second predetermined temperature difference threshold, where the second temperature difference threshold is greater than the first temperature difference threshold. Therefore, the refrigeration effect of the air conditioner is guaranteed as much as possible while the phenomenon of high-temperature and high-humidity water blowing of the air conditioner is avoided.
In the embodiment of the invention, the controller 1 is used for controlling the compressor 5 to operate at the rated frequency when the difference value between the indoor environment temperature and the evaporator temperature is higher than the preset second temperature difference threshold value, so that the refrigeration effect of the air conditioner is ensured as much as possible while the phenomenon of high-temperature high-humidity water blowing during the refrigeration operation of the air conditioner is avoided. Of course, in other embodiments, other implementations may be used. For example, when the compressor 5 is continuously operated for a predetermined period of time, the compressor 5 is controlled to operate at the rated frequency.
Further, when the frequency of the compressor 5 is too low, functions such as air conditioner exhaust protection, current protection and external coil protection are triggered, and it is difficult to avoid high-temperature and high-humidity water blowing of the air conditioner by reducing the frequency. Therefore, when the operating frequency of the compressor 5 is lower than the preset second preset frequency, the controller 1 also controls the compressor 5 to operate at the rated frequency to secure the cooling effect of the air conditioner. In the embodiment of the present invention, the second preset frequency is a frequency corresponding to the compressor 5 when the air conditioner triggers functions such as exhaust protection, current protection, and outer coil protection.
When the air conditioner starts a refrigeration mode to operate, the first temperature sensor 3 detects the indoor environment temperature and feeds back the indoor environment temperature to the controller 1, the second temperature sensor 4 detects the evaporator temperature and feeds back the evaporator temperature to the controller 1, the third temperature sensor 6 detects the outdoor temperature and feeds back the outdoor temperature to the controller 1, and meanwhile the main control board can acquire the current operation frequency of the compressor 5 according to the power frequency of the compressor 5. After the air conditioner is operated for a period of time, the evaporator temperature and the indoor environment temperature tend to be stable, at this time, the controller 1 judges whether the difference value between the indoor environment temperature and the evaporator temperature is lower than a preset first temperature difference threshold value, judges whether the compressor 5 is in low-frequency operation (that is, the operating frequency of the compressor 5 is higher than a preset first preset frequency or the operating frequency of the compressor 5 is within a conventional logical frequency range), and judges whether the outdoor environment temperature is within a preset temperature range. When the difference between the indoor environment temperature and the evaporator temperature is lower than the first temperature difference threshold, the compressor 5 is not in low-frequency operation, and the outdoor environment temperature is in the temperature range, it is indicated that the air conditioner performs refrigeration operation in a high-temperature and high-humidity environment, and a high-temperature and high-humidity water blowing phenomenon can occur. At this time, the controller 1 sends a control signal to the compressor 5 to control the compressor 5 to reduce the operation frequency, so as to prevent the evaporator from being overheated seriously, so that the indoor environment temperature and the evaporator temperature are kept within a preset temperature difference range, and the air conditioner is prevented from generating a high-temperature high-humidity water blowing phenomenon during the cooling operation. In the process of the frequency reduction operation of the compressor 5, the difference value between the indoor environment temperature and the evaporator temperature is gradually increased, when the difference value between the indoor environment temperature and the evaporator temperature is higher than a preset second temperature difference threshold value, the phenomenon of high-temperature high-humidity water blowing of the air conditioner is eliminated, and in order to guarantee the refrigeration effect of the air conditioner, the controller 1 controls the compressor 5 to operate at the rated frequency. In the process, if the operation frequency of the compressor 5 is lower than the preset second preset frequency, it indicates that the functions of air conditioner exhaust protection, current protection, outer coil protection and the like are triggered, and it is difficult to achieve the purpose of avoiding high-temperature high-humidity water blowing of the air conditioner by reducing the frequency, and at this time, the controller 1 also controls the compressor 5 to operate at the rated frequency to guarantee the refrigeration effect of the air conditioner.
To sum up, the refrigeration control system provided by the embodiment of the invention can automatically judge whether the air conditioner is in a high-temperature high-humidity water blowing state or not according to the indoor environment temperature, the outdoor environment temperature, the evaporator temperature and the operation frequency of the compressor 5 after the air conditioner starts to perform refrigeration operation for a period of time, and when the air conditioner is in the high-temperature high-humidity water blowing state, the compressor 5 is controlled to reduce the operation frequency to avoid serious overheating of the evaporator, so that the high-temperature high-humidity water blowing phenomenon of the air conditioner is eliminated. Meanwhile, after the high-temperature high-humidity water blowing phenomenon of the air conditioner is eliminated, the controller 1 controls the compressor 5 to operate at a rated frequency, so that the refrigeration effect of the air conditioner is further guaranteed while the high-temperature high-humidity water blowing phenomenon of the air conditioner is eliminated. In addition, when the air conditioner triggers functions such as air conditioner exhaust protection, current protection and outer coil protection, it is difficult to avoid high-temperature and high-humidity water blowing of the air conditioner by reducing the frequency, and the compressor 5 can be controlled to operate at the rated frequency to guarantee the refrigeration effect of the air conditioner.
Second embodiment
Referring to fig. 3, a flow chart of a refrigeration control method according to a preferred embodiment of the invention is shown, wherein the refrigeration control method is applied to an air conditioner to prevent the air conditioner from blowing water at high temperature and high humidity, and the flow chart shown in fig. 3 will be described in detail below.
Step S101, obtains the indoor ambient temperature, the evaporator temperature, the outdoor ambient temperature, and the operating frequency of the compressor 5.
In the embodiment of the invention, when the air conditioner starts a refrigeration mode to operate, the first temperature sensor 3 detects the indoor environment temperature and feeds back the indoor environment temperature to the controller 1, the second temperature sensor 4 detects the evaporator temperature and feeds back the evaporator temperature to the controller 1, the third temperature sensor 6 detects the outdoor temperature and feeds back the outdoor temperature to the controller 1, and meanwhile, the main control board can acquire the current operation frequency of the compressor 5 according to the power supply frequency of the compressor 5.
Step S102, determining whether the difference between the indoor ambient temperature and the evaporator temperature is lower than a preset first temperature difference threshold, the compressor 5 is not in low-frequency operation, and the outdoor ambient temperature is within a preset temperature range, if yes, executing step S103.
After the air conditioner is operated for a period of time, the evaporator temperature and the indoor environment temperature tend to be stable, at this time, the controller 1 determines whether the difference between the indoor environment temperature and the evaporator temperature is lower than a preset first temperature difference threshold, determines whether the compressor 5 is in low-frequency operation (i.e., the operating frequency of the compressor 5 is higher than a preset first preset frequency or the operating frequency of the compressor 5 is within a conventional logical frequency range), and determines whether the outdoor environment temperature is within a preset temperature range. If the difference between the indoor ambient temperature and the evaporator temperature is lower than the first temperature difference threshold, the compressor 5 is not in the low frequency operation, and the outdoor ambient temperature is within the temperature range, step S103 is performed.
Step S103 reduces the frequency of the compressor 5.
When the difference between the indoor environment temperature and the evaporator temperature is lower than the first temperature difference threshold, the compressor 5 is not in low-frequency operation, and the outdoor environment temperature is in the temperature range, it is indicated that the air conditioner performs refrigeration operation in a high-temperature and high-humidity environment, and a high-temperature and high-humidity water blowing phenomenon can occur. At this time, the controller 1 sends a control signal to the compressor 5 to control the compressor 5 to reduce the operation frequency so that the indoor ambient temperature and the evaporator temperature are maintained within a preset temperature difference range, thereby preventing the air conditioner from generating a high-temperature high-humidity water blowing phenomenon during the cooling operation.
And step S104, judging whether the difference value between the indoor environment temperature and the evaporator temperature is higher than a preset second temperature difference threshold value, and if so, executing step S106.
In the process of the compressor 5 operating at the reduced frequency, the difference between the indoor ambient temperature and the evaporator temperature is gradually increased, and in this process, the controller determines whether the difference between the indoor ambient temperature and the evaporator temperature is higher than a second predetermined temperature difference threshold, and executes step S106 when the difference between the indoor ambient temperature and the evaporator temperature is higher than the second predetermined temperature difference threshold.
Step S105, determining whether the operating frequency of the compressor 5 is lower than a preset second preset frequency, and if so, executing step S106.
Meanwhile, the controller 1 further determines whether the operating frequency of the compressor 5 is lower than a second preset frequency, and if the operating frequency of the compressor 5 is lower than the second preset frequency, step S106 is performed.
In the embodiment of the present invention, the order of step S104 and step S105 is not limited.
In step S106, the compressor 5 is controlled to operate at the rated frequency.
When the difference value between the indoor environment temperature and the evaporator temperature is higher than the preset second temperature difference threshold value, it indicates that the high-temperature high-humidity water blowing phenomenon of the air conditioner is eliminated, and in order to guarantee the refrigeration effect of the air conditioner, the controller 1 controls the compressor 5 to operate at the rated frequency.
When the operating frequency of the compressor 5 is lower than a second preset frequency, it indicates that functions such as air conditioner exhaust protection, current protection and outer coil protection are triggered, and it is difficult to avoid high-temperature and high-humidity water blowing of the air conditioner by reducing the frequency, and at this time, the controller 1 also controls the compressor 5 to operate at a rated frequency to ensure the refrigeration effect of the air conditioner.
Referring to fig. 4, a flow chart of another refrigeration control method according to a preferred embodiment of the invention is shown, and the flow chart shown in fig. 4 will be described in detail.
In step S201, the indoor ambient temperature, the evaporator temperature, the outdoor ambient temperature, and the operating frequency of the compressor 5 are obtained.
Step S202, determining whether the difference between the indoor ambient temperature and the evaporator temperature is lower than a preset first temperature difference threshold, the compressor 5 is not in low-frequency operation, and the outdoor ambient temperature is within a preset temperature range, if yes, executing step S203.
In step S203, the frequency of the compressor 5 is reduced.
Step S204, it is determined whether the compressor 5 has been continuously operated for a predetermined period of time, and if so, step S206 is performed.
During the operation of the compressor 5 at the reduced frequency, the controller 1 further determines whether the compressor 5 has been continuously operated for a predetermined period of time, and if so, performs step S206.
Step S205, determining whether the operating frequency of the compressor 5 is lower than a preset second preset frequency, and if so, executing step S206.
In the embodiment of the present invention, the order of step S204 and step S205 is not limited.
In step S206, the compressor 5 is controlled to operate at the rated frequency.
During the low-frequency operation of the compressor 5, the difference between the indoor ambient temperature and the evaporator temperature gradually increases, and after the compressor 5 continuously operates for a predetermined period of time, it is shown that the high-temperature high-humidity water blowing phenomenon of the air conditioner has been eliminated, and in order to ensure the refrigeration effect of the air conditioner, the controller 1 controls the compressor 5 to operate at the rated frequency.
When the operating frequency of the compressor 5 is lower than a second preset frequency, it indicates that functions such as air conditioner exhaust protection, current protection and outer coil protection are triggered, and it is difficult to avoid high-temperature and high-humidity water blowing of the air conditioner by reducing the frequency, and at this time, the controller 1 also controls the compressor 5 to operate at a rated frequency to ensure the refrigeration effect of the air conditioner.
In summary, the refrigeration control method provided in the embodiment of the present invention can automatically determine whether the air conditioner is in the high-temperature high-humidity water blowing state according to the indoor environment temperature, the outdoor environment temperature, the evaporator temperature and the operation frequency of the compressor 5 after the air conditioner starts to perform the refrigeration operation for a period of time, and when the air conditioner is in the high-temperature high-humidity water blowing state, the compressor 5 is controlled to reduce the operation frequency to avoid serious overheating of the evaporator, so as to eliminate the high-temperature high-humidity water blowing phenomenon of the air conditioner. Meanwhile, after the high-temperature high-humidity water blowing phenomenon of the air conditioner is eliminated, the controller 1 controls the compressor 5 to operate at a rated frequency, so that the refrigeration effect of the air conditioner is further guaranteed while the high-temperature high-humidity water blowing phenomenon of the air conditioner is eliminated. In addition, when the air conditioner triggers functions such as air conditioner exhaust protection, current protection and outer coil protection, it is difficult to avoid high-temperature and high-humidity water blowing of the air conditioner by reducing the frequency, and the compressor 5 can be controlled to operate at the rated frequency to guarantee the refrigeration effect of the air conditioner.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (8)

1. A refrigeration control method for preventing an air conditioner from blowing water at high temperature and high humidity during a refrigeration operation, the method comprising:
obtaining an indoor ambient temperature detected by a first temperature sensor, an evaporator temperature detected by a second temperature sensor and an operating frequency of a compressor of the air conditioner;
obtaining the outdoor environment temperature detected by a third temperature sensor;
when the difference value between the indoor environment temperature and the evaporator temperature is lower than a first temperature difference threshold value, the compressor is not in low-frequency operation, and the outdoor environment temperature is in a preset temperature range, reducing the frequency of the compressor to keep the indoor environment temperature and the evaporator temperature in a preset temperature difference range;
after the frequency of the compressor is reduced, when the operating frequency of the compressor is lower than a preset second preset frequency, the compressor is controlled to operate at a rated frequency, wherein the second preset frequency is a frequency corresponding to the compressor when the air conditioner triggers exhaust protection, current protection and external coil protection functions.
2. The refrigeration control method as recited in claim 1, wherein said reducing the frequency of the compressor when the difference between the indoor ambient temperature and the evaporator temperature is below the first delta threshold, the compressor is not in low frequency operation, and the outdoor ambient temperature is within a predetermined temperature range comprises:
when the difference between the indoor environment temperature and the evaporator temperature is lower than the first temperature difference threshold value, the running frequency of the compressor is higher than a preset first preset frequency, and the outdoor environment temperature is in the temperature range, the frequency of the compressor is reduced.
3. The refrigeration control method as recited in claim 1, wherein said reducing the frequency of the compressor when the difference between the indoor ambient temperature and the evaporator temperature is below the first delta threshold, the compressor is not in low frequency operation, and the outdoor ambient temperature is within a predetermined temperature range comprises:
when the difference between the indoor ambient temperature and the evaporator temperature is less than the first temperature difference threshold, the operating frequency of the compressor is within a normal logic frequency range, and the outdoor ambient temperature is within the temperature range, the frequency of the compressor is reduced.
4. The refrigeration control method as recited in claim 1, wherein after reducing the frequency of the compressor, the method further comprises:
and when the difference value between the indoor environment temperature and the evaporator temperature is higher than a preset second temperature difference threshold value, or after the compressor continuously operates for a preset time period, controlling the compressor to operate at a rated frequency.
5. The refrigeration control system is applied to an air conditioner and is characterized by comprising a controller (1), an evaporator (2), a first temperature sensor (3), a second temperature sensor (4), a third temperature sensor (6) and a compressor (5), wherein the controller (1) is respectively and electrically connected with the evaporator (2), the first temperature sensor (3), the second temperature sensor (4), the third temperature sensor (6) and the compressor (5);
the first temperature sensor (3) is used for detecting the indoor environment temperature, the second temperature sensor (4) is used for detecting the evaporator temperature of the evaporator (2), the third temperature sensor (6) is used for detecting the outdoor environment temperature, and the controller (1) is used for reducing the frequency of the compressor (5) when the difference value between the indoor environment temperature and the evaporator temperature is lower than a first temperature difference threshold value, the compressor (5) is not in low-frequency operation, and the outdoor environment temperature is in a preset temperature range, so that the indoor environment temperature and the evaporator temperature are kept in a preset temperature difference range;
the controller (1) is further configured to control the compressor (5) to operate at a rated frequency when the operating frequency of the compressor (5) is lower than a preset second preset frequency after the frequency of the compressor (5) is reduced, wherein the second preset frequency is a frequency corresponding to the compressor (5) when the air conditioner triggers an exhaust protection function, a current protection function and an external coil protection function.
6. The refrigeration control system according to claim 5, wherein the controller (1) is configured to decrease the frequency of the compressor (5) when the difference between the indoor ambient temperature and the evaporator temperature is lower than the first temperature difference threshold, the operating frequency of the compressor (5) is higher than a first preset frequency, and the outdoor ambient temperature is within the temperature range.
7. The refrigeration control system of claim 5, wherein the controller (1) is configured to decrease the frequency of the compressor (5) when the difference between the indoor ambient temperature and the evaporator temperature is below the first delta t threshold, the operating frequency of the compressor (5) is within a normal logic frequency range, and the outdoor ambient temperature is within the temperature range.
8. The refrigeration control system according to claim 5, wherein after reducing the frequency of the compressor (5), the controller (1) is further configured to control the compressor (5) to operate at a rated frequency when the difference between the indoor ambient temperature and the evaporator temperature is higher than a second predetermined temperature difference threshold value, or after the compressor (5) continues to operate for a predetermined period of time.
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