CN106839276A - The control method and air-conditioning of a kind of lack of fluorine of air-conditioners detection - Google Patents

Abstract

The invention discloses the control method and air-conditioning of a kind of detection of lack of fluorine of air-conditioners, belong to air-conditioning technical field.The control method includes：Detect the delivery temperature of the compressor of air-conditioning；Detect the hull-skin temperature of the body of compressor；According to the temperature gap between delivery temperature and hull-skin temperature, the scarce fluorine amount of the air-conditioning in temperature range and the corresponding temperature interval residing for temperature difference；According to the scarce fluorine amount of air-conditioning, the preset protected mode of control operation of air conditioner.Two parameters of delivery temperature and hull-skin temperature of control method of the invention according to compressor; can be by both temperature variations of detection; and then judge the actual fluorine amount of air-conditioning system, such that it is able to take safeguard measure in time in lack of fluorine of air-conditioners, effectively ensure the safe operation of air-conditioning.

Description

A control method for detecting fluorine deficiency in an air conditioner and an air conditioner

technical field

The invention relates to the technical field of air conditioners, in particular to a control method for detecting fluorine deficiency in an air conditioner and an air conditioner.

Background technique

Freon is a commonly used refrigerant medium in household or commercial air-conditioning and refrigeration systems. Since Freon completes the state transition of vaporization and liquefaction in the closed circulation system of the air conditioner, the general air conditioner does not need to add fluoride for at least 5 years or even until it is scrapped. In the existing air-conditioning products, due to the influence of factors such as the installation method of the air-conditioning and the welding quality of the air-conditioning pipes, there may be a problem of refrigerant leakage during the process of the air-conditioning. Reduced thermal effect, protective shutdown, indoor unit water leakage, and indoor evaporator freezing affect the normal use of the air conditioner.

Therefore, how to detect the amount of fluorine in operation of the air conditioner so that the amount of fluorine can be replenished in time when the air conditioner has a fluorine deficiency problem has always been an important issue in the research and development of air conditioner products.

Contents of the invention

Embodiments of the present invention provide a control method for detecting fluorine deficiency in an air conditioner and an air conditioner. In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is presented below. This summary is not an overview, nor is it intended to identify key/critical elements or delineate the scope of these embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.

According to the first aspect of the present invention, a control method for detecting fluorine deficiency in an air conditioner is provided. The control method includes: detecting the discharge temperature of the compressor of the air conditioner; detecting the temperature of the outer surface of the body of the compressor; Determine the temperature range of the temperature difference and the fluorine deficiency of the air conditioner in the corresponding temperature range; according to the fluorine deficiency of the air conditioner, control the preset protection mode of the air conditioner.

Further, according to the temperature difference between the exhaust gas temperature and the outer surface temperature, determine the temperature range of the temperature difference and the fluorine deficiency of the air conditioner in the corresponding temperature range. The process includes: when T1≤ΔT<T2, The fluorine deficiency of the air conditioner is R≤R1, where △T is the difference between the exhaust temperature and the outer surface temperature, the value of T1 is 3-5°C, the value of T2 is 8-10°C, and the fluorine deficiency R is the air conditioner's deficiency The percentage of the amount of fluorine and the rated amount of fluorine, the value of R1 is 20%.

Further, according to the fluorine deficiency of the air conditioner, the preset protection mode of the air conditioner is controlled. The process includes: when the fluorine deficiency of the air conditioner is R≤R1, the air conditioner is controlled to maintain the operation, and the fluorine shortage warning information is sent to the user.

Further, according to the temperature difference between the exhaust gas temperature and the outer surface temperature, determine the temperature range of the temperature difference and the fluorine deficiency of the air conditioner in the corresponding temperature range. The process includes: when T2≤ΔT≤T3, The fluorine deficiency of the air conditioner is R1<R≤R2, where △T is the difference between the exhaust gas temperature and the outer surface temperature, the value of T2 is 8-10°C, the value of T3 is 10-20°C, and the fluorine deficiency amount R is The percentage of the air conditioner's lack of fluorine to the rated fluorine, R1 is 20%, and R2 is 50%.

Further, according to the fluorine deficiency of the air conditioner, control the preset protection mode of the air conditioner operation, the process includes: when the fluorine deficiency of the air conditioner R2<R≤R3, control and maintain the operation of the air conditioner, and push the fluorine shortage warning information to the user; if After the time t, the fluorine amount of the air conditioner does not reach the rated fluorine amount, and the air conditioner is controlled to stop running.

Further, according to the temperature difference between the exhaust gas temperature and the outer surface temperature, determine the temperature range of the temperature difference and the fluorine deficiency of the air conditioner in the corresponding temperature range. The process includes: when T3<△T, the air conditioner The amount of fluorine deficiency R>R3, where △T is the difference between the exhaust gas temperature and the outer surface temperature, T3 takes a value of 10-20°C, the amount of fluorine deficiency R is the percentage of the fluorine deficiency of the air conditioner and the rated fluorine amount, R3 The value is 50%.

Further, according to the fluorine deficiency of the air conditioner, the preset protection mode of the air conditioner is controlled. The process includes: when the fluorine deficiency of the air conditioner is R>R3, the air conditioner is controlled to stop running, and the fluorine deficiency warning information is sent to the user.

Further, the process of pushing the fluorine shortage early warning information to the user includes: controlling the air conditioner to send the fluorine shortage early warning information to the associated mobile terminal, and pushing it to the user; the fluorine shortage early warning information includes: the fluorine shortage status information of the air conditioner, and the The information on the amount of fluorine added corresponding to the amount; the information on the state of fluorine deficiency includes at least low fluorine deficiency, moderate fluorine deficiency and severe fluorine deficiency.

Further, the exhaust temperature is the average temperature of the exhaust gas within t time period after the air conditioner is started up, and the outer surface temperature is the average temperature of the outer surface within t time period after the air conditioner is started up.

According to the second aspect of the present invention, there is also provided an air conditioner applying the above control method. The air conditioner includes an indoor unit and an outdoor unit, wherein the outdoor unit includes a compressor and a four-way valve, and the exhaust port of the compressor passes through the exhaust The pipeline is connected with the four-way valve, and the air conditioner also includes a first sensor for detecting the temperature of the exhaust gas and a second sensor for detecting the temperature of the outer surface, wherein the first sensor is set on the exhaust pipeline, and the second sensor is set on the on the outer surface of the compressor body.

When the air-conditioning system runs with a lack of fluorine, due to the reduction of the refrigerant medium, the heat in the inner cavity of the compressor cannot be completely taken away by the refrigerant or is taken away very little, so the discharge temperature of the compressor decreases and the compressor body is in an overheated state; the control of the present invention Method According to the two parameters of compressor exhaust temperature and external surface temperature, the actual fluorine content of the air conditioning system can be judged by detecting the temperature changes of the two, so that protective measures can be taken in time when the air conditioner is short of fluorine, and effective protection safe operation of the air conditioner.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description serve to explain the principles of the invention.

Fig. 1 is a flow chart 1 of a control method of the present invention shown according to an exemplary embodiment;

Fig. 2 is a flowchart 2 of the control method of the present invention shown according to an exemplary embodiment;

Fig. 3 is a schematic structural diagram of an air conditioner according to an exemplary embodiment of the present invention.

detailed description

The following description and drawings illustrate specific embodiments of the invention sufficiently to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely represent possible variations. Individual components and functions are optional unless explicitly required, and the order of operations may vary. Portions and features of some embodiments may be included in or substituted for those of other embodiments. The scope of embodiments of the present invention includes the full scope of the claims, and all available equivalents of the claims. Herein, various embodiments may be referred to individually or collectively by the term "invention", which is for convenience only and is not intended to automatically limit the scope of this application if in fact more than one invention is disclosed. A single invention or inventive concept. Herein, relational terms such as first and second etc. are used only to distinguish one entity or operation from another without requiring or implying any actual relationship or relationship between these entities or operations. order. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method or apparatus comprising a set of elements includes not only those elements but also other elements not expressly listed elements, or also include elements inherent in such a process, method, or apparatus. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method or apparatus comprising said element. Various embodiments herein are described in a progressive manner, each embodiment focuses on the differences from other embodiments, and the same and similar parts of the various embodiments may be referred to each other. As for the methods, products, etc. disclosed in the examples, since they correspond to the methods disclosed in the examples, the description is relatively simple, and for relevant details, please refer to the description of the methods.

As shown in Fig. 1 and Fig. 2, the present invention provides a kind of control method of air conditioner fluorine deficiency detection, and control method comprises:

S101. Detect the exhaust temperature of the compressor of the air conditioner;

Freon and other gaseous refrigerants are compressed in the compressor from a low-temperature and low-pressure state to a high-temperature and high-pressure state, and are transported to the condenser of the air conditioner along the exhaust pipeline of the compressor. The heat is absorbed by the refrigerant, so the detected exhaust temperature can reflect the amount of refrigerant flowing through the compressor in gaseous state;

S102, detecting the temperature of the outer surface of the body of the compressor;

When the amount of refrigerant in the air conditioner is sufficient, most of the heat generated by the compressor is absorbed by the refrigerant, so only a small amount of heat will be transferred to the compressor body, and the compressor body will always remain within a safe working range. , the compressor still does work according to the set power. Since the amount of refrigerant flowing through the compressor is reduced, it cannot take away all the heat generated by the work, and part of the heat not absorbed by the refrigerant will be transferred to the compressor body, causing the compressor to The temperature of the outer surface of the body rises, so the temperature of the outer surface of the compressor can also reflect the amount of refrigerant in the air conditioner;

S103. According to the temperature difference between the exhaust gas temperature and the outer surface temperature, determine the temperature range where the temperature difference is located and the fluorine deficiency amount of the air conditioner corresponding to the temperature range;

In the embodiment, the discharge temperature T _A is detected by the first sensor, and the outer surface temperature T _B of the compressor is detected by the second sensor, and the temperature difference between the two is ΔT=T _A -T _B ; the temperature range And the amount of fluorine deficiency corresponding to the temperature range is determined through experiments in advance, and can be adjusted appropriately according to different air conditioner models;

S104. According to the amount of fluorine deficiency of the air conditioner, control the preset protection mode of the air conditioner.

Different fluorine deficiency conditions of the air conditioner have different impacts on the operation of the air conditioner. Therefore, in order to improve the safety of the air conditioner during operation, it is necessary to enable different protection modes according to the specific fluorine deficiency of the air conditioner, so as to avoid the damage caused by the fluorine deficiency of the air conditioner. The compressor is overheated, the tank insulation melts, and the coil burns out at high temperature.

The working principle of the control method of the present invention is that: when the air conditioner compressor is running at the set power, the heat generated by its work is quantitative, and most of the heat is used to compress and heat the refrigerant, and the refrigerant is used as a carrier to take out Compressor, a small amount of heat remains in the compressor, because the body of the compressor will heat up during normal operation; since the power set by the compressor is compatible with the rated amount of refrigerant fluorine, when the air conditioner is short of When fluorine is running, the amount of refrigerant used as a heat carrier decreases, and the heat taken out of the compressor through the refrigerant also decreases, resulting in an increase in residual heat in the compressor, so the temperature of the compressor body will increase. temperature and the outer surface temperature of the compressor body to determine whether the compressor is generating heat due to abnormal operation, so as to realize the judgment of the actual operating fluorine amount in the air conditioning system; in the actual use of the air conditioner, when the amount of refrigerant is normal, the heat can flow smoothly If it is taken away by the refrigerant, the refrigerant flow rate is normal, and the heat inside the compressor will not accumulate too much, so the difference between the temperature of the upper casing of the compressor and the exhaust temperature is very small; the more fluorine is lacking, the slower the refrigerant takes away the heat, and the heat is compressed The more the compressor accumulates, the larger the temperature difference between the upper casing of the compressor and the exhaust pipe sensor will be.

The specific process of determining the amount of fluorine deficiency and operating the corresponding protection mode involved in the control method of the present invention will be described below in conjunction with some embodiments.

In the embodiment (1) of the present invention, according to the temperature difference between the exhaust gas temperature and the outer surface temperature, the temperature range where the temperature difference is located and the fluorine deficiency amount of the air conditioner corresponding to the temperature range are determined, and the process includes:

When T1≤△T<T2, the air conditioner’s fluorine deficiency R≤20%,

Among them, △T is the difference between the exhaust gas temperature and the outer surface temperature, the value of T1 is 3-5°C, the value of T2 is 8-10°C, and the fluorine deficiency R is the percentage of the fluorine deficiency of the air conditioner and the rated fluorine amount , that is, in embodiment (1), when the temperature difference between the exhaust gas temperature and the outer surface temperature is at T1-T2, the fluorine deficiency of the air conditioner accounts for within 20% of the rated fluorine amount required for the normal operation of the air conditioner.

At the same time, when the fluorine deficiency of the air conditioner is less than or equal to 20%, the air conditioner can be judged to be in a low-level fluorine deficiency state. The warning indicator light set on the indoor unit sends a blue warning signal to the user to remind the user to add fluoride in time.

In Embodiment (2) of the present invention, according to the temperature difference between the exhaust gas temperature and the outer surface temperature, the temperature range where the temperature difference is located and the fluorine deficiency amount of the air conditioner corresponding to the temperature range are determined. The process includes:

When T2≤△T≤T3, the fluorine deficiency of the air conditioner is 20%<R≤50%,

Among them, △T is the difference between the exhaust gas temperature and the outer surface temperature, T2 takes a value of 8-10°C, T3 takes a value of 10-20°C, and the fluorine deficiency R is the percentage of the air-conditioner's lack of fluorine and the rated fluorine , that is, in embodiment (2), when the temperature difference between the exhaust gas temperature and the outer surface temperature is between T2 and T3, the fluorine deficiency of the air conditioner accounts for 20% to 20% of the rated fluorine amount required for the normal operation of the air conditioner. 50%.

At the same time, when the fluorine deficiency of the air conditioner is 20%<R≤50%, the air conditioner can be judged to be in a moderate fluorine deficiency state, and the change of fluorine content has limited impact on the operation of the air conditioner in a short period of time, so the operation of the air conditioner can be controlled and maintained; in addition, The air conditioner can also send a yellow warning signal to the user through the warning indicator light set on the indoor unit to remind the user to add fluoride in time;

If the user has not supplemented the lack of refrigerant in the air conditioner after a period of time t, resulting in the fluorine content of the air conditioner not meeting the rated fluorine requirements for the normal operation of the air conditioner, the air conditioner is controlled to stop running; after the user fills the fluorine, the air conditioner is re-tested when the compressor is running When the exhaust temperature and outer surface temperature of the air conditioner reach the rated fluorine amount or the fluorine deficiency is less than or equal to 20%, the air conditioner can keep running for a long time.

In Embodiment (3) of the present invention, according to the temperature difference between the exhaust gas temperature and the outer surface temperature, the temperature range where the temperature difference is located and the fluorine deficiency amount of the air conditioner corresponding to the temperature range are determined, and the process includes:

When T3<△T, the fluorine deficiency of air conditioner R>50%,

Among them, ΔT is the difference between the exhaust gas temperature and the outer surface temperature, T3 takes a value of 10-20°C, and the fluorine deficiency R is the percentage of the fluorine deficiency of the air conditioner and the rated fluorine quantity, that is, in the embodiment (3) , when the temperature difference between the exhaust gas temperature and the outer surface temperature is greater than T3, the fluorine deficiency of the air conditioner accounts for more than 50% of the rated fluorine amount required for the normal operation of the air conditioner.

At the same time, when the fluorine deficiency R of the air conditioner is greater than 50%, the air conditioner can be judged to be in a state of severe fluorine deficiency. The warning indicator light set on the machine sends a red warning signal to the user, reminding the user to add fluorine in time; after the user fills the fluorine, re-test the exhaust temperature and the outer surface temperature of the compressor when the air conditioner is running, and when the fluorine content of the air conditioner reaches the rated fluorine If the amount of fluorine or fluorine deficiency is less than or equal to 20%, the long-term operation of the air conditioner can be maintained.

In some embodiments of the present invention, in addition to sending an early warning signal to the user through the early warning indicator light on the air conditioner body, the control method of the present invention can also control the air conditioner to send fluorine shortage early warning information to associated mobile terminals, such as mobile phones, tablets, etc. computer, etc., and push it to the user through the installed app; optionally, the fluorine deficiency warning information includes: the fluorine deficiency status information of the air conditioner, the fluorine addition amount information corresponding to the fluorine deficiency amount, and the corresponding warning indicator light Indicated fluorine deficiency status, the fluorine deficiency status information that the present invention pushes to the user through the app includes at least low fluorine deficiency, moderate fluorine deficiency and severe fluorine deficiency, so that users can Keep abreast of the fluorine deficiency of air conditioners and other information.

In order to ensure the measurement accuracy of the relevant temperature parameters involved in the above-mentioned embodiments, the temperature measurement process of the exhaust gas temperature and the external surface temperature of the compressor is the average temperature within a set time length. In the embodiment, the set time length 1min; when the air conditioner switches between different operating modes and adjusts the compressor power, the heat generated by the compressor is different, so continuous detection of relevant temperature data can reduce the interference caused by instantaneous or short-term temperature mutations and reduce the temperature caused by temperature changes. resulting in measurement errors, etc.

In the control method of the present invention, the processes of measuring the above-mentioned relevant temperature parameters, determining the amount of fluorine deficiency, and running the protection mode are carried out in a set time period. 24 hours is the set time period to detect the amount of fluorine; the control method also includes: comparing the changes in the amount of fluorine in one or several adjacent time periods, and when the change in the amount of fluorine exceeds the preset threshold, a push notification will be sent to the user Air conditioner fault early warning information, for example, if the fluorine deficiency of the air conditioner increases from 20% to 50% in two adjacent time periods, it can be determined that the air conditioner has a large amount of refrigerant leakage, so the user can be reminded in time through the air conditioner fault early warning Air conditioning maintenance.

As shown in Fig. 3, the present invention also provides an air conditioner applying the control method disclosed in the above-mentioned embodiments. The air conditioner includes an indoor unit and an outdoor unit, wherein the outdoor unit includes a compressor 3 and a four-way valve 4, and the compressor 3 The exhaust port of the air conditioner is connected with the four-way valve 4 through the exhaust pipeline 5, and the air conditioner also includes a first sensor 6 for detecting the temperature of the exhaust gas and a second sensor 7 for detecting the temperature of the outer surface, wherein the first sensor 6 is arranged on the exhaust pipeline 5, and the second sensor 7 is arranged on the outer surface of the body of the compressor 3; the air conditioner also includes a controller, and the controller mainly includes:

an acquisition unit, configured to acquire the exhaust gas temperature detected by the first sensor 6 and the outer surface temperature of the body of the compressor 3 detected by the second sensor 7;

The main control unit is used to determine the temperature range of the temperature difference and the fluorine deficiency of the air conditioner in the corresponding temperature range according to the temperature difference between the exhaust gas temperature and the outer surface temperature; to control the air conditioner according to the fluorine deficiency of the air conditioner Run preset protected mode.

Other components and structures such as the first heat exchanger 1, the second heat exchanger 2, and the throttle valve 8 of the air conditioner are not related to the innovation of the present invention, so they will not be described in detail.

It should be understood that the present invention is not limited to the processes and structures that have been described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.

Claims (10)

1. the control method that a kind of lack of fluorine of air-conditioners is detected, it is characterised in that the control method includes：

Detect the delivery temperature of the compressor of the air-conditioning；

Detect the hull-skin temperature of the body of the compressor；

According to the temperature gap between the delivery temperature and the hull-skin temperature, the temperature residing for the temperature gap is determined The scarce fluorine amount of interval and the correspondence temperature range the air-conditioning；

According to the scarce fluorine amount of the air-conditioning, the preset protected mode of control operation of air conditioner.

2. control method according to claim 1, it is characterised in that according to the delivery temperature and the hull-skin temperature Between temperature gap, determine the air-conditioning of temperature range residing for the temperature gap and the correspondence temperature range Lack fluorine amount, process includes：

In T1≤△ T ＜ T2, the scarce fluorine amount R≤R1 of the air-conditioning,

Wherein, △ T are the difference of the delivery temperature and the hull-skin temperature, and the T1 values are 3~5 DEG C, and the T2 takes It is 8~10 DEG C to be worth, and the scarce fluorine amount R is the percentage of the fluorine amount that lacks of the air-conditioning and specified fluorine amount, and the R1 values are 20%.

3. control method according to claim 2, it is characterised in that according to the scarce fluorine amount of the air-conditioning, control air-conditioning fortune The preset protected mode of row, process includes：

In the scarce fluorine amount R≤R1 of the air-conditioning, control maintains the operation of air conditioner, and pushes scarce fluorine early warning information to user.

4. control method according to claim 1, it is characterised in that according to the delivery temperature and the hull-skin temperature Between temperature gap, determine the air-conditioning of temperature range residing for the temperature gap and the correspondence temperature range Lack fluorine amount, process includes：

In T2≤△ T≤T3, the scarce fluorine amount R1 ＜ R≤R2 of the air-conditioning,

Wherein, △ T are the difference of the delivery temperature and the hull-skin temperature, and the T2 values are 8~10 DEG C, and the T3 takes It is 10~20 DEG C to be worth, and the scarce fluorine amount R is the percentage of the fluorine amount that lacks of the air-conditioning and specified fluorine amount, and the R1 values are 20%, the R2 values are 50%.

5. control method according to claim 4, it is characterised in that according to the scarce fluorine amount of the air-conditioning, control air-conditioning fortune The preset protected mode of row, process includes：

In the scarce fluorine amount R2 ＜ R≤R3 of the air-conditioning, control maintains the operation of air conditioner, and pushes scarce fluorine early warning letter to user Breath；

If the fluorine amount of the air-conditioning is not up to specified fluorine amount after t durations, control the air-conditioning out of service.

6. control method according to claim 1, it is characterised in that according to the delivery temperature and the hull-skin temperature Between temperature gap, determine the air-conditioning of temperature range residing for the temperature gap and the correspondence temperature range Lack fluorine amount, process includes：

In T3 ＜ △ T, the scarce fluorine amount R ＞ R3 of the air-conditioning,

Wherein, △ T are the difference of the delivery temperature and the hull-skin temperature, and the T3 values are 10~20 DEG C, described to lack Fluorine amount R is the percentage of the fluorine amount that lacks of the air-conditioning and specified fluorine amount, and the R3 values are 50%.

7. control method according to claim 6, it is characterised in that according to the scarce fluorine amount of the air-conditioning, control air-conditioning fortune The preset protected mode of row, process includes：

In the scarce fluorine amount R ＞ R3 of the air-conditioning, control the air-conditioning out of service, and scarce fluorine early warning information is pushed to user.

8. the control method according to claim 3,5 or 7, it is characterised in that

To the scarce fluorine early warning information that user pushes, process includes：Control air-conditioning sends to associated the scarce fluorine early warning information Mobile terminal, and be pushed to user；

The scarce fluorine early warning information includes：The scarce fluorine status information of the air-conditioning fluorine adding content letter corresponding with the scarce fluorine amount Breath；

The scarce fluorine status information at least includes that low scarce fluorine, moderate lack fluorine and severe lacks fluorine.

9. control method according to claim 1, it is characterised in that when the delivery temperature is t after air-conditioning start operation Average exhaust temperature in length, the hull-skin temperature is the outer surface mean temperature in air-conditioning start operation t durations.

10. it is a kind of apply as described in any one of claim 1-9 control method air-conditioning, the air-conditioning include indoor set and room Outer machine, wherein, the outdoor unit includes compressor and four-way valve, and the exhaust outlet of the compressor passes through gas exhaust piping and described four Port valve is connected, it is characterised in that the air-conditioning is also included for detecting the first sensor of the delivery temperature and for examining The second sensor of the hull-skin temperature is surveyed, wherein, the first sensor is arranged on the gas exhaust piping, and described second Sensor is arranged on the body outer surface of the compressor.