CN111397135A - Fluorine-lack detection control method of air conditioner and air conditioner - Google Patents

Abstract

The invention belongs to the technical field of air conditioners, and aims to solve the problem that the difference between the exhaust temperature of the compressor and the outer surface temperature of the body of the compressor is used in the existing air conditioner to determine the amount of fluorine deficiency, which cannot accurately reflect the real fluorine deficiency of the air conditioner. To solve the problem of the situation, the present invention provides a fluorine deficiency detection and control method for an air conditioner. The air conditioner includes a compressor and an outdoor unit. The fluorine deficiency detection and control method includes: obtaining the working current of the compressor; judging whether the working current of the compressor is in the Within the preset current range; if the working current of the compressor is not within the preset current range, further obtain the exhaust temperature of the compressor and the outlet refrigerant temperature of the outdoor unit; calculate the exhaust temperature of the compressor and the outlet refrigerant temperature of the outdoor unit The difference of temperature; according to the difference, determine the fluorine deficiency of the air conditioner. The present invention can reflect the parameters of the real operating conditions of the air conditioner, thereby greatly improving the accuracy of the air conditioner in detecting the fluorine deficiency and improving user experience.

Description

Fluorine deficiency detection and control method for air conditioner and air conditioner

technical field

The invention belongs to the technical field of air conditioners, and specifically provides a fluorine deficiency detection and control method for an air conditioner and an air conditioner.

Background technique

The air conditioner is a device that can adjust the indoor ambient temperature, and can cool, heat and dehumidify the room through the air conditioner.

During the operation of the existing air conditioner, the content of freon in the air conditioner will gradually decrease due to leakage over time, so that the system of the air conditioner is deficient in fluorine, and the lack of fluorine will cause the heat exchange effect of the air conditioner to deteriorate. It is necessary to replenish Freon to the air conditioner in time. The existing fluorine replenishment method of the air conditioner is generally replenished regularly, but this fluorine replenishment method is uncertain. This is because the leakage of fluorine from each air conditioner is different, and it is possible There will be no fluorine deficiency in the system and fluorine is supplemented or fluorine is supplemented only when the system is lacking in a large amount of fluorine. Therefore, in the prior art, there are some technical solutions for detecting whether the air conditioner is deficient in fluorine by itself. For example, the patent document with the patent number of 201710002111.X discloses a control method for detecting the deficient fluorine in an air conditioner and an air conditioner. The difference between the exhaust temperature of the compressor and the outer surface temperature of the compressor body is used to determine the amount of fluorine deficiency. This method has a disadvantage, that is, the outer surface temperature of the compressor body will be affected by the ambient temperature. , In winter, the outer surface temperature of the compressor body is low, and in summer, the outer surface temperature of the compressor body is high, so it cannot accurately reflect the fluorine deficiency of the air conditioner.

Therefore, there is a need in the art for a new fluorine deficiency detection and control method for an air conditioner and a corresponding air conditioner to solve the above problems.

SUMMARY OF THE INVENTION

In order to solve the above-mentioned problems in the prior art, that is, in order to solve the problem that the difference between the exhaust gas temperature of the compressor and the outer surface temperature of the compressor body is used in the existing air conditioner to determine the amount of fluorine deficiency, it cannot accurately reflect the real condition of the air conditioner. To solve the problem of fluorine deficiency, the present invention provides a fluorine deficiency detection and control method for an air conditioner. The air conditioner includes a compressor and an outdoor unit, and the fluorine deficiency detection and control method includes: obtaining the working current of the compressor; judging the working current of the compressor Whether it is within the preset current range; if the operating current of the compressor is not within the preset current range, further obtain the exhaust temperature of the compressor and the outlet refrigerant temperature of the outdoor unit; calculate the exhaust temperature of the compressor and the temperature of the outdoor unit. The difference of the outlet refrigerant temperature; according to the difference, determine the fluorine deficiency of the air conditioner.

In the preferred technical solution of the above-mentioned fluorine deficiency detection and control method, the difference is proportional to the amount of fluorine deficiency.

In the preferred technical solution of the above-mentioned fluorine deficiency detection and control method, the step of "determining the fluorine deficiency of the air conditioner according to the difference" specifically includes: if the difference is smaller than the first preset value, the fluorine deficiency is less than 20%; If the difference is greater than or equal to the first preset value and less than or equal to the second preset value, the fluorine deficiency is 20% to 50%; if the difference is greater than the second preset value, the fluorine deficiency is more than 50% .

In the preferred technical solution of the above-mentioned fluorine deficiency detection and control method, the step of "obtaining the working current of the compressor" specifically includes: making the air conditioner operate in a refrigerated manner, making the compressor operate at a fixed frequency, and making the fan of the outdoor unit run at the first set rotational speed Rotate to make the fan of the indoor unit of the air conditioner rotate at the second set speed and keep the electronic expansion valve of the air conditioner at the set opening; only after the set time elapses, the working current of the compressor is obtained.

In the preferred technical solution of the above-mentioned fluorine deficiency detection and control method, the fluorine deficiency detection and control method further includes: adjusting the air deflector of the indoor unit to the maximum opening degree at the same time as the step of "running the compressor at a constant frequency".

In a preferred technical solution of the above-mentioned fluorine deficiency detection and control method, at the same time as or after the step of "determining the fluorine deficiency of the air conditioner", the fluorine deficiency detection and control method further includes: displaying the fluorine deficiency of the air conditioner.

In a preferred technical solution of the above-mentioned fluorine deficiency detection and control method, the step of "displaying the fluorine deficiency of the air conditioner" specifically includes: causing the remote control of the air conditioner to display the fluorine deficiency of the air conditioner.

In a preferred technical solution of the above-mentioned fluorine deficiency detection and control method, the step of "displaying the fluorine deficiency of the air conditioner" specifically includes: causing the display panel of the air conditioner to display the fluorine deficiency of the air conditioner.

In the preferred technical solution of the above-mentioned fluorine deficiency detection and control method, the air conditioner communicates with the user terminal, and the step of "displaying the fluorine deficiency amount of the air conditioner" specifically includes: sending the fluorine deficiency amount information to the user terminal; Fluoride deficiency.

In another aspect, the present invention also provides an air conditioner, the air conditioner includes a controller configured to be able to execute the above-mentioned fluorine deficiency detection and control method.

Those skilled in the art can understand that, in the preferred technical solution of the present invention, whether the air conditioner is deficient in fluorine can be determined by obtaining the working current of the compressor and based on the working current, and then based on the exhaust temperature of the compressor and the temperature of the outdoor unit. The difference of the outlet refrigerant temperature determines the fluorine deficiency of the air conditioner. Through this control method, the actual fluorine deficiency of the air conditioner can be accurately reflected. The exhaust temperature of the compressor and the outlet refrigerant temperature of the outdoor unit are both refrigerants. The temperature will not be affected by environmental factors, but a parameter that can reflect the actual operation of the air conditioner, thereby greatly improving the accuracy of the air conditioner in detecting fluoride deficiency and improving the user experience.

Further, make the air conditioner run for cooling, make the compressor run at a fixed frequency, make the fan of the outdoor unit rotate at the first set speed, make the fan of the indoor unit of the air conditioner rotate at the second set speed, and make the electronic device of the air conditioner rotate. The expansion valve maintains the set opening; the working current of the compressor is obtained only after the set time has elapsed. Through such a control method, the air conditioner can obtain the working current of the compressor only when the air conditioner is in a steady state, thereby further improving the accuracy of the air conditioner lack of fluorine judgment.

Description of drawings

FIG. 1 is a flow chart of the fluorine deficiency detection and control method of the air conditioner of the present invention.

Detailed ways

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 used to explain the technical principle of the present invention, and are not intended to limit the protection scope of the present invention.

It should be noted that, in the description of the present invention, the terms of direction or positional relationship indicated by the terms "center", "upper", "lower", "inner", "outer", etc. are based on the directions shown in the drawings or The positional relationship is only for the convenience of description, rather than indicating or implying that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

In addition, it should be noted that, in the description of the present invention, unless otherwise expressly specified and limited, the terms "arrangement" and "connection" should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrally connected; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or the internal communication between the two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

Based on the problem pointed out in the background art that the existing air conditioner uses the difference between the exhaust gas temperature of the compressor and the outer surface temperature of the compressor body to determine the amount of fluorine deficiency and cannot accurately reflect the real fluorine deficiency of the air conditioner, the present invention Provided are a fluorine deficiency detection and control method for an air conditioner and an air conditioner, aiming to accurately reflect the real fluorine deficiency of the air conditioner, and the discharge temperature of the compressor and the outlet refrigerant temperature of the outdoor unit are both the temperature of the refrigerant, It will not be affected by environmental factors, but can reflect the actual operation of the air conditioner, thereby greatly improving the accuracy of the air conditioner in detecting fluoride deficiency and improving the user experience.

Specifically, the air conditioner of the present invention includes an indoor unit, an outdoor unit, a compressor, an electronic expansion valve and a four-way valve. The indoor unit, the outdoor unit, the compressor and the electronic expansion valve constitute a refrigerant circulation loop, and the four-way valve is used to make the air conditioner switch between cooling mode and heating mode. The indoor unit is indoors, and the outdoor unit and compressor are outdoors. In addition, both the indoor unit and the outdoor unit also include fans and other components. In addition, the air conditioner of the present invention further includes a controller configured to be able to execute the fluorine deficiency detection and control method of the present invention. As shown in FIG. 1 , the fluorine deficiency detection and control method of the present invention includes: obtaining the working current of the compressor; judging whether the working current of the compressor is within the preset current range; if the working current of the compressor is not within the preset current range , then further obtain the exhaust temperature of the compressor and the outlet refrigerant temperature of the outdoor unit; calculate the difference between the exhaust temperature of the compressor and the outlet refrigerant temperature of the outdoor unit; determine the fluorine deficiency of the air conditioner according to the difference. Among them, those skilled in the art can flexibly set the specific range of the preset current interval according to the number of horses of the air conditioner. The preset current range of the air conditioner can be set to 3.5-4.5A, and the preset current range can be set to 4-5A for the 1.5-horsepower air conditioner. Of course, the preset current range of the above example is only exemplary , does not constitute any limitation to the present invention. In addition, a discharge temperature sensor can be installed at the discharge port of the compressor to detect the discharge temperature of the compressor, and an outlet refrigerant temperature sensor can be installed at the pipe outlet of the outdoor unit to detect the outlet refrigerant temperature of the outdoor unit. Both the exhaust gas temperature sensor and the outlet refrigerant temperature sensor are connected to the controller to feed back temperature information to the controller. In the present invention, it is preferable to obtain the working current of the compressor in real time, and obtain the exhaust temperature of the compressor and the outlet refrigerant temperature of the outdoor unit in real time, that is, obtain and judge in real time, so as to timely determine the fluorine deficiency of the air conditioner.

After repeated experiments, analysis and comparison by the inventor, the fluorine deficiency of the air conditioner can be most accurately reflected by obtaining the temperature of the refrigerant at two different locations. After the calculation of the experimental data, the temperature of the refrigerant is directly related to the amount of fluorine deficiency. In the prior art, the difference between the exhaust temperature of the compressor and the outer surface temperature of the body of the compressor is used to determine the fluorine deficiency of the air conditioner. The present invention can greatly improve the accuracy of the fluorine deficiency of the air conditioner. Obtain the working current of the compressor, and judge whether the air conditioner is deficient in fluorine based on the working current of the compressor. Then, the difference between the exhaust temperature of the compressor and the outlet refrigerant temperature of the outdoor unit can not only determine the amount of fluorine deficiency in the air conditioner, but also It can further determine whether the air conditioner is really deficient in fluorine, that is, the working current of the compressor and the difference between the exhaust temperature of the compressor and the outlet refrigerant temperature of the outdoor unit all determine that the system of the air conditioner is really deficient in fluorine. , to avoid the possibility of misjudgment by using a single parameter. It should be noted that the working current of the compressor may fluctuate when the air conditioner is not in a steady state, and the discharge temperature of the compressor and the outlet refrigerant temperature of the outdoor unit are also prone to deviations. The probability of deviation between the exhaust gas temperature and the outlet refrigerant temperature of the outdoor unit is very low. Therefore, the present invention firstly judges by the working current of the compressor, and then passes the exhaust gas temperature of the compressor and the outlet refrigerant temperature of the outdoor unit. Re-judgment can avoid the misjudgment of the air conditioner, and the fluorine deficiency of the air conditioner can be accurately determined according to the difference between the exhaust temperature of the compressor and the outlet refrigerant temperature of the outdoor unit, which is convenient for maintenance personnel to accurately Determine the amount of freon that needs to be supplemented.

Preferably, the difference between the exhaust temperature of the compressor and the temperature of the refrigerant at the outlet of the outdoor unit is proportional to the fluorine deficiency of the air conditioner. Of course, the difference can also be proportional to the fluorine deficiency. In a possible situation, the step of “determining the fluorine deficiency of the air conditioner according to the difference” specifically includes: if the difference is less than the first preset value, the fluorine deficiency is less than 20% (that is, less than 20%) ; If the difference is greater than or equal to the first preset value and less than or equal to the second preset value, the fluorine deficiency is 20% to 50% (that is, greater than or equal to 20% and less than or equal to 50%); if the difference If it is greater than the second preset value, the amount of fluorine deficiency is more than 50% (that is, greater than 50%). The first preset value may be 2°C, and the second preset value may be 5°C. Of course, the above-mentioned first preset value and second preset value are only exemplary, and those skilled in the art may The specific proportional relationship is flexibly set in the application.

Preferably, the step of "obtaining the working current of the compressor" specifically includes: making the air conditioner run for cooling, making the compressor run at a fixed frequency, making the fan of the outdoor unit rotate at a first set rotational speed, and making the fan of the indoor unit of the air conditioner rotate Rotate at the second set rotational speed and keep the electronic expansion valve of the air conditioner at the set opening; only obtain the working current of the compressor after the set time has elapsed. Through such a control method, the air conditioner is allowed to run for a period of time, and the air conditioner is in a relatively stable state, and the working current of the compressor is obtained at this time, which can greatly avoid the current fluctuation of the compressor, thereby further improving the detection accuracy. It should be noted that the starting current of the compressor is quite different from the normal working current. Generally, the starting current of the compressor is 5 times its normal working current. Set the rotation speed to make the fan of the indoor unit of the air conditioner rotate at the second preset speed and keep the electronic expansion valve of the air conditioner at the set opening, so that the air conditioner maintains a steady state and the working current of the compressor is normal work The current, the fluctuation is extremely small, thereby improving the accuracy of the compressor working current judgment. The set time can be 5 minutes or 10 minutes, etc. Of course, the specific value of the above preset time is only exemplary, and those skilled in the art can flexibly set it in practical applications. The adjustment and change of specific numerical values do not constitute a limitation to the present invention, and should all be limited within the protection scope of the present invention. Further preferably, at the same time as the step of "running the compressor at a constant frequency", the fluorine deficiency detection and control method of the present invention further comprises: adjusting the air deflector of the indoor unit to the maximum opening degree.

Preferably, at the same time as or after the step of "determining the fluorine deficiency of the air conditioner", the fluorine deficiency detection and control method of the present invention further comprises: displaying the fluorine deficiency of the air conditioner. The specific way of displaying the fluorine deficiency of the air conditioner may be to make the remote control of the air conditioner display the fluorine deficiency of the air conditioner; or make the display panel of the air conditioner display the fluorine deficiency of the air conditioner; or the air conditioner and the user terminal (for example, Mobile phone, tablet, etc.) communication, first send the information of fluorine deficiency to the user terminal, and then make the user terminal display the fluorine deficiency of the air conditioner. Those skilled in the art can flexibly set specific ways to display the fluorine deficiency of the air conditioner in practical applications. The adjustment and change of this display of the fluorine deficiency of the air conditioner does not constitute a limitation to the present invention, and should be limited to the protection scope of the present invention. within.

So far, the technical solutions of the present invention have been described with reference to the preferred embodiments shown in the accompanying drawings, however, those skilled in the art can easily understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims (10)

1. the lack of fluorine detection control method of an air conditioner, is characterized in that, described air conditioner comprises compressor and outdoor unit, and described lack of fluorine detection control method comprises: obtaining the working current of the compressor; judging whether the operating current of the compressor is within a preset current range; If the operating current of the compressor is not within the preset current range, further acquiring the exhaust gas temperature of the compressor and the outlet refrigerant temperature of the outdoor unit; Calculate the difference between the exhaust gas temperature of the compressor and the outlet refrigerant temperature of the outdoor unit; According to the difference value, the fluorine deficiency amount of the air conditioner is determined. 2 . The fluorine deficiency detection and control method according to claim 1 , wherein the difference is proportional to the fluorine deficiency amount. 3 . 3. The fluorine deficiency detection and control method according to claim 2, wherein the step of "determining the fluorine deficiency of the air conditioner according to the difference value" specifically comprises: If the difference is less than the first preset value, the fluorine deficiency is less than 20%; If the difference is greater than or equal to the first preset value and less than or equal to the second preset value, the fluorine deficiency is 20% to 50%; If the difference is greater than the second preset value, the fluorine deficiency is more than 50%. 4. The fluorine deficiency detection control method according to claim 1, wherein the step of "obtaining the operating current of the compressor" specifically comprises: Make the air conditioner run for cooling, make the compressor run at a constant frequency, make the fan of the outdoor unit rotate at the first set speed, and make the fan of the indoor unit of the air conditioner rotate at the second set speed and keeping the electronic expansion valve of the air conditioner at the set opening; The working current of the compressor is obtained only after a set time has elapsed. 5 . The fluorine deficiency detection and control method according to claim 4 , wherein, while the step of “running the compressor at a constant frequency”, the fluorine deficiency detection and control method further comprises: 6 . Adjust the air deflector of the indoor unit to the maximum opening. 6. The fluorine deficiency detection and control method according to claim 1, characterized in that, at the same time as or after the step of "determining the fluorine deficiency of the air conditioner", the fluorine deficiency detection and control method further comprises: Displays the fluorine deficiency of the air conditioner. 7. The fluorine deficiency detection and control method according to claim 6, wherein the step of "displaying the fluorine deficiency of the air conditioner" specifically comprises: Make the remote controller of the air conditioner display the fluorine deficiency of the air conditioner. 8. The fluorine deficiency detection and control method according to claim 6, wherein the step of "displaying the fluorine deficiency of the air conditioner" specifically comprises: The display panel of the air conditioner displays the fluorine deficiency of the air conditioner. 9 . The fluorine deficiency detection and control method according to claim 6 , wherein the air conditioner communicates with a user terminal, and the step of “displaying the fluorine deficiency of the air conditioner” specifically comprises: 10 . sending fluorine deficiency information to the user terminal; The user terminal is caused to display the fluorine deficiency of the air conditioner. 10 . An air conditioner, characterized in that the air conditioner comprises a controller configured to be able to execute the fluorine deficiency detection and control method according to any one of claims 1 to 9 .

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