WO2023201984A1

WO2023201984A1 - Method for detecting refrigerant leakage position, and storage medium and air conditioning system

Info

Publication number: WO2023201984A1
Application number: PCT/CN2022/119968
Authority: WO
Inventors: 安平诚
Original assignee: 广东美的制冷设备有限公司; 美的集团股份有限公司
Priority date: 2022-04-20
Filing date: 2022-09-20
Publication date: 2023-10-26
Also published as: CN116951662A

Abstract

A method for detecting a refrigerant leakage position, and a storage medium and an air conditioning system. The method comprises: determining a state of a refrigerant, which flows through a point to be subjected to detection (S1); detecting a temperature change of said point (S2); and according to the state of the refrigerant and the temperature change, determining whether refrigerant leakage occurs at said point (S3).

Description

Method and storage medium, air conditioning system for detecting refrigerant leakage location

Cross-references to related applications

This disclosure claims priority to the Chinese patent application with application number 202210416448.6 submitted on April 20, 2022, titled "Method and storage medium for detecting refrigerant leakage location, air conditioning system", the entire content of which is incorporated by reference in This disclosure is ongoing.

Technical field

The present disclosure relates to the technical field of household appliances, and in particular to a method for detecting a refrigerant leakage location, a computer-readable storage medium, and an air conditioning system.

Background technique

With the improvement of people's living standards, air conditioning, as a device for regulating indoor temperature, has been widely used. However, during the installation process and long-term use of the air conditioner, the pipeline may be damaged due to bending, long-term corrosion, or other external force majeure reasons, which may cause the air conditioner refrigerant to leak, affecting the cooling or heating effect of the air conditioner. In severe cases, it may even cause damage. Burning equipment, explosion, etc.

At present, in a multi-split air conditioner with one tow, if a refrigerant leak occurs, the lubricating oil flowing with the refrigerant will spray out at the leakage area, causing the nearby pipes (attics, walls, etc.) to become dirty, which will cause users to of attention. In this case, the location of the leak can be determined based on the stain, but it cannot be determined which pipe is leaking. When performing maintenance, maintenance workers can only rely on their own feelings and experience combined with a refrigerant leak detector to check all piping to determine the location of the refrigerant leak.

In addition, when the air conditioner is running, it can also be determined that the refrigerant leakage has occurred by detecting that the refrigerant flow rate has decreased to a certain value. And even if it can be determined that the air conditioner has refrigerant leakage based on the decrease in refrigerant flow rate, it cannot be determined which indoor unit has the leakage. question. In order to determine which indoor unit is leaking, it is necessary to remove the ceiling and walls near all indoor units, which wastes a lot of time and energy.

public content

The present disclosure aims to solve one of the technical problems in the related art, at least to a certain extent. To this end, the first purpose of the present disclosure is to propose a method for detecting the leakage location of refrigerant, which can detect whether the refrigerant leaks based on the refrigerant state and temperature change of the point to be detected, so as to determine the leakage location when the refrigerant leaks. It improves the detection efficiency of refrigerant leakage, shortens the detection time, facilitates after-sales maintenance, and eliminates safety hazards.

A second object of the present disclosure is to provide a method for detecting a refrigerant leakage location.

A third object of the present disclosure is to provide a computer-readable storage medium.

The fourth object of the present disclosure is to provide an air conditioning system.

In order to achieve the above object, the first embodiment of the present disclosure proposes a method for detecting a refrigerant leakage location, which includes: determining the state of the refrigerant flowing through the point to be measured; detecting the temperature change of the point to be measured; and detecting the refrigerant leakage location according to the refrigerant state and temperature Changes determine whether refrigerant leakage occurs at the point to be measured.

According to the method for detecting a refrigerant leakage location according to an embodiment of the present disclosure, the state of the refrigerant flowing through the point to be measured is first determined, then the temperature change of the point to be measured is detected, and finally, whether a refrigerant leakage occurs at the point to be measured is determined based on the refrigerant state and the temperature change. . Therefore, this method can detect whether the refrigerant leaks based on the refrigerant state and temperature change of the point to be detected, so as to determine the leakage location when the refrigerant leaks, improves the detection efficiency of refrigerant leakage, shortens the detection work time, and facilitates after-sales maintenance. , eliminate safety hazards.

In addition, the method for detecting refrigerant leakage location according to the above embodiments of the present disclosure may also have the following additional technical features:

According to an embodiment of the present disclosure, the refrigerant state includes gaseous state, liquid state and gas-liquid mixed state, wherein determining whether refrigerant leakage occurs at the point to be measured according to the refrigerant state and temperature change includes: when the refrigerant flowing through the point to be measured is in the gaseous state, If the temperature of the point to be measured rises based on the temperature change, it is determined that a refrigerant leak occurs at the point to be measured; when the refrigerant flowing through the point to be measured is in a liquid state or a gas-liquid mixed state, if the temperature of the point to be measured drops based on the temperature change, Then it is determined that refrigerant leakage occurs at the point to be measured.

According to an embodiment of the present disclosure, detecting the temperature change of the point to be detected includes: obtaining the current temperature of the point to be measured; comparing the current temperature with the temperature of the point to be measured in a normal state without leakage, to determine whether the point to be measured is Whether the temperature of the point rises or falls.

In order to achieve the above object, the second embodiment of the present disclosure proposes a method for detecting the location of refrigerant leakage. The method is applied to an air conditioning system. The air conditioning system includes at least one indoor unit. The indoor unit includes an indoor heat exchanger. The air conditioner The system also includes at least one expansion valve corresponding to at least one indoor heat exchanger. When the air conditioning system is heating, the inlet pipe of the indoor heat exchanger is provided with a first temperature sensor. The first temperature sensor is used to detect the inlet pipe. When the air conditioning system is heating, the outlet pipeline of the indoor heat exchanger is provided with a second temperature sensor. The second temperature sensor is used to detect the temperature of the outlet pipeline. The method also includes: controlling the air conditioning system to perform heating. , so that liquid refrigerant is stored inside the indoor unit; when the heating time of the air conditioning system reaches the first preset time or the difference between the temperature of the inlet pipe and the temperature of the outlet pipe is greater than the first preset temperature difference threshold, the air conditioner is controlled The system stops heating; detects refrigerant leakage.

According to the method for detecting a refrigerant leakage position according to an embodiment of the present disclosure, the air conditioning system is first controlled to perform heating so that liquid refrigerant is stored inside the indoor unit, and then the heating time of the air conditioning system reaches the first preset time or the inlet When the difference between the temperature of the pipeline and the temperature of the outlet pipeline is greater than the first preset temperature difference threshold, the air conditioning system is controlled to stop heating, and finally whether the refrigerant leaks is detected. Therefore, this method can detect whether the refrigerant leaks based on the refrigerant state and temperature change of the point to be detected, so as to determine the leakage location when the refrigerant leaks, improves the detection efficiency of refrigerant leakage, shortens the detection work time, and facilitates after-sales maintenance. , eliminate safety hazards.

According to an embodiment of the present disclosure, when the air conditioning system performs heating, the opening of the expansion valve is adjusted to become smaller and/or the fan speed of the indoor unit becomes larger.

According to an embodiment of the present disclosure, when the air conditioning system stops heating, the expansion valve is closed.

According to an embodiment of the present disclosure, detecting whether the refrigerant leaks includes: obtaining the indoor ambient temperature, the temperature change of the inlet pipeline, and the temperature change of the outlet pipeline; when the indoor ambient temperature is less than the first preset temperature, if the temperature of the outlet pipeline If the temperature accelerates and the temperature of the inlet pipe drops normally, it is determined that refrigerant leakage occurs in the outlet pipe; when the indoor ambient temperature is greater than or equal to the first preset temperature and less than the second preset temperature, if the outlet pipe corresponds to the point to be measured If the temperature accelerates to decrease and the temperature of the inlet pipe drops normally and then rises, it is determined that a refrigerant leak occurs in the outlet pipe; when the indoor ambient temperature is greater than or equal to the second preset temperature, if the temperature of the outlet pipe rises and the temperature of the inlet pipe If it rises, it is determined that there is a refrigerant leakage in the outlet pipe.

According to an embodiment of the present disclosure, when the temperature of the outlet pipe of the indoor unit decreases at a rate greater than a set threshold, it is determined to be an accelerated decrease.

According to an embodiment of the present disclosure, detecting whether the refrigerant leaks includes: obtaining the indoor ambient temperature, the temperature change of the inlet pipeline, and the temperature change of the outlet pipeline; when the indoor ambient temperature is less than the first preset temperature, if the outlet pipeline If the temperature of the outlet pipe drops and the temperature of the inlet pipe rises, it is determined that refrigerant leakage occurs in the inlet pipe; when the indoor ambient temperature is greater than or equal to the first preset temperature and less than the second preset temperature, if the temperature of the outlet pipe drops and the inlet pipe If the temperature of the outlet pipe rises normally, it is determined that refrigerant leakage has occurred in the inlet pipe; when the indoor ambient temperature is greater than or equal to the second preset temperature, if the temperature of the outlet pipe drops and the temperature of the inlet pipe rises, it is determined that refrigerant leakage has occurred in the inlet pipe leakage.

According to one embodiment of the present disclosure, before acquiring the indoor ambient temperature, the temperature change of the inlet pipeline, and the temperature change of the outlet pipeline, detecting whether the refrigerant leaks includes: acquiring the current temperature of the inlet pipeline and/or the temperature change of the outlet pipeline. Current temperature; when the difference between the current temperature of the inlet pipeline and the temperature of the inlet pipeline when no leakage occurs is greater than the second preset temperature difference threshold and/or if the current temperature of the outlet pipeline is different from the temperature of the outlet pipeline when no leakage occurs When the temperature difference is greater than the second preset temperature difference threshold, refrigerant leakage is determined.

According to an embodiment of the present disclosure, the duration for detecting whether the refrigerant leaks is at least four hours.

In order to achieve the above object, a third embodiment of the present disclosure provides a computer-readable storage medium. The storage medium stores a program for detecting a refrigerant leakage location. The program for detecting a refrigerant leakage location is implemented when executed by a processor. The above-mentioned method for detecting the location of refrigerant leakage.

The computer-readable storage medium of the embodiment of the present disclosure, by executing the above method for detecting the location of refrigerant leakage, can detect whether the refrigerant leaks according to the refrigerant state and temperature change of the point to be detected, so as to determine the leakage when the refrigerant leaks. The location improves the detection efficiency of refrigerant leakage, shortens the detection time, facilitates after-sales maintenance, and eliminates safety hazards.

In order to achieve the above object, an air conditioning system proposed in a fourth embodiment of the present disclosure includes a memory, a processor, and a program stored in the memory and executable by the processor for detecting a refrigerant leakage location. The processor executes a program for detecting a refrigerant leakage location. When performing the leak location program, implement the above-mentioned method for detecting the refrigerant leak location.

The air conditioning system of the embodiment of the present disclosure, by executing the above method for detecting the refrigerant leakage location, can detect whether the refrigerant leaks based on the refrigerant state and temperature change of the point to be detected, so as to determine the leakage location when the refrigerant leaks, which improves the The detection efficiency of refrigerant leakage shortens the detection time, facilitates after-sales maintenance, and eliminates safety hazards.

Additional aspects and advantages of the disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the disclosure.

Description of the drawings

Figure 1 is a flow chart of a method for detecting a refrigerant leakage location according to an embodiment of the present disclosure;

Figure 2 is a schematic diagram of temperature changes over time after leakage in different refrigerant states according to an embodiment of the present disclosure;

Figure 3 is a schematic diagram of an air conditioning system according to a specific embodiment of the present disclosure;

Figure 4 is a schematic diagram of refrigerant leakage position detection according to an embodiment of the present disclosure;

Figure 5 is a schematic diagram of refrigerant leakage position detection according to another embodiment of the present disclosure;

Figure 6 is a block diagram of an air conditioning system according to an embodiment of the present disclosure.

Detailed ways

Embodiments of the present disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present disclosure and are not to be construed as limitations of the present disclosure.

The method for detecting a refrigerant leakage location, the computer-readable storage medium, and the air conditioning system proposed by the embodiments of the present disclosure are described below with reference to the accompanying drawings.

In one embodiment of the present disclosure, as shown in Figure 3, the air conditioning system may include a compressor, an outdoor unit, an outdoor heat exchanger and multiple indoor units, wherein each indoor unit includes an indoor heat exchanger, an expansion valve It is installed in the outdoor unit and has an adjustable opening to control the refrigerant flow flowing through the electronic expansion valve. That is, the greater the opening of the expansion valve, the greater the refrigerant flow flowing through the expansion valve, and the smaller the opening of the expansion valve. , the less refrigerant flow flows through the expansion valve. Each indoor heat exchanger is also equipped with a corresponding fan, and the gear of each fan can be adjusted to adjust the fan speed.

It should be understood that the specific structure and working principle of each component in the air conditioning system are existing technologies and are well known to those skilled in the art, and will not be described again here.

1 is a flowchart of a method for detecting a refrigerant leakage location according to an embodiment of the present disclosure.

As shown in Figure 1, the method for detecting a refrigerant leakage location according to an embodiment of the present disclosure may include the following steps:

S1, determine the state of the refrigerant flowing through the point to be measured.

S2, detect the temperature change of the point to be measured. Among them, the temperature change of the point to be detected can be determined by a temperature sensor arranged at the point to be detected.

S3: Determine whether refrigerant leakage occurs at the point to be measured based on the refrigerant state and temperature changes.

Specifically, when detecting the location of refrigerant leakage, the leakage in the air pipe or liquid pipe is generally detected. Therefore, the points to be measured are generally set at the inlet pipe (air pipe) and outlet pipe (liquid pipe) of the indoor heat exchanger. )superior. If the refrigerant in the liquid pipe leaks, the nearby liquid refrigerant will evaporate according to the amount of leaked refrigerant. This is due to the heat absorption caused by the evaporation of the liquid refrigerant, and the nearby temperature will drop; if it is the refrigerant in the gas pipe If a leak occurs, the high-temperature gaseous refrigerant close to the compressor flows into the gas pipe, so the temperature nearby will also rise. Regardless of whether it is a gas pipe or a liquid pipe, as long as liquid refrigerant exists in the pipe, the evaporation of the liquid refrigerant will cause the temperature to drop. Therefore, it is necessary to determine whether refrigerant leakage occurs at the point to be measured based on the state of the refrigerant and changes in temperature.

According to an embodiment of the present disclosure, the refrigerant state may include a gaseous state, a liquid state, and a gas-liquid mixed state, wherein determining whether a refrigerant leakage occurs at the point to be measured is determined based on the refrigerant state and temperature changes, including: when the refrigerant flowing through the point to be measured is in a gaseous state. , if the temperature of the point to be measured is determined to rise based on the temperature change, then the refrigerant leakage at the point to be measured is determined; when the refrigerant flowing through the point to be measured is in a liquid state or a gas-liquid mixed state, if the temperature of the point to be measured is determined to be decreased based on the temperature change , then it is judged that refrigerant leakage occurs at the point to be measured.

Specifically, the refrigerant will appear in various states during the operation of the air conditioner, such as gaseous state, liquid state and gas-liquid mixed state. Taking the heating operation of the air conditioning system as an example, the high-temperature and high-pressure gaseous refrigerant from the compressor enters the indoor heat exchanger. After being exchanged by the indoor heat exchanger, the refrigerant becomes liquid. The liquid refrigerant passes through the expansion valve and part of the refrigerant is vaporized. , changes from liquid to gas, and the refrigerant after passing through the expansion valve becomes a two-phase mixture (gas-liquid mixed state). The liquid in the mixture becomes gas again after being exchanged in the outdoor heat exchanger and returns to the compressor. At the same time, if the refrigerant flowing through the point to be measured is a liquid refrigerant or a gas-liquid mixed refrigerant, if a refrigerant leak occurs at this time, the liquid refrigerant will evaporate when it encounters indoor air, absorbing heat from the surrounding environment and causing The temperature near the measuring point is relatively low, so it can be judged that a refrigerant leak has occurred based on the temperature drop passing through the point to be measured; if the refrigerant flowing through the point to be measured is a gaseous refrigerant, if a refrigerant leak occurs at this time, The outflow of high-temperature and high-pressure gas compressed by the compressor will cause the temperature near the point to be measured to rise. Therefore, it can be judged that a refrigerant leak has occurred here based on the rise in temperature flowing through the point to be measured.

Further, according to an embodiment of the present disclosure, detecting the temperature change of the point to be measured includes: obtaining the current temperature of the point to be measured; comparing the current temperature with the temperature of the point to be measured in a normal state without leakage, to determine Determine whether the temperature of the point to be measured rises or falls.

Specifically, the current temperature of the point to be measured can be obtained through a temperature sensor arranged at the point to be measured. In order to determine whether the temperature of the point to be measured has changed, it is necessary to compare the temperature of the point to be measured obtained by the current temperature sensor with the temperature of the point to be measured when the air conditioner is operating normally, so as to determine whether the temperature of the point to be measured has changed. Among them, the data of the normal operation of the air conditioning system are preset in the memory of the air conditioning system. When the air conditioner is in different working conditions, or the air conditioner is in different working modes, and different models of air conditioners have different temperature data during normal operation.

For example, the current temperature of the point to be measured is obtained, and then the current temperature of the point to be measured is compared with normal data (normal operation data) stored in the air conditioning system in advance. The normal data is shown as curve 3 in Figure 2. When the refrigerant leaks, the temperature changes are obvious, as shown in the dotted line in Figure 2. Some parts are higher than curve 3, and some parts are higher than curve 3. decreases in curve 3. Specifically, the temperature change is caused by a temperature decrease caused by the evaporation of the liquid refrigerant, as shown in curve 2 in Figure 2, or a temperature increase caused by the inflow of high-pressure gas, as shown by curve 1 in Figure 2.

In summary, according to the method for detecting a refrigerant leakage location according to an embodiment of the present disclosure, the state of the refrigerant flowing through the point to be measured is first determined, then the temperature change of the point to be measured is detected, and finally the state of the refrigerant to be measured is determined based on the refrigerant state and the temperature change. Check whether refrigerant leakage occurs. Therefore, this method can detect whether the refrigerant leaks based on the refrigerant state and temperature change of the point to be detected, so as to determine the leakage location when the refrigerant leaks, improves the detection efficiency of refrigerant leakage, shortens the detection work time, and facilitates after-sales maintenance. , eliminate safety hazards.

According to another embodiment of the present disclosure, a method for detecting a refrigerant leakage position is applied to an air conditioning system, the air conditioning system includes at least one indoor unit, the indoor unit includes an indoor heat exchanger, and the air conditioning system further includes an indoor heat exchanger corresponding to the at least one indoor heat exchanger. At least one expansion valve is provided. When the air conditioning system is heating, the inlet pipeline of the indoor heat exchanger is provided with a first temperature sensor. The first temperature sensor is used to detect the temperature of the inlet pipeline. When the air conditioning system is heating, The outlet pipeline of the indoor heat exchanger is provided with a second temperature sensor. The second temperature sensor is used to detect the temperature of the outlet pipeline. The method also includes: controlling the air conditioning system to perform heating operation so that liquid refrigerant is stored inside the indoor unit. ; When the heating time of the air conditioning system reaches the first preset time or the difference between the temperature of the inlet pipe and the temperature of the outlet pipe is greater than the first preset temperature difference threshold, control the air conditioning system to stop heating; detect whether the refrigerant is leaking. Among them, the first preset time and the first preset temperature difference threshold can be determined according to the actual situation. Generally, the first preset time can be set to 30 minutes, and the first preset threshold can be set to 10K.

According to one embodiment of the present disclosure, when the air conditioning system performs heating, the opening of the expansion valve of the indoor unit is adjusted to become smaller and/or the fan speed of the indoor unit becomes larger.

Specifically, the air conditioning system may include at least one indoor unit or may include multiple indoor units. When there is one indoor unit in the air conditioning system, it can be determined whether the refrigerant leaks in the outdoor unit or in the indoor unit. When there are multiple indoor units in the air conditioning system, it can be determined which indoor unit the leakage occurs. Among them, the indoor unit includes an indoor heat exchanger and an expansion valve. Generally, in commercial air conditioners, the expansion valve is usually installed in the indoor unit. In household air conditioners, the expansion valve is usually installed in the outdoor unit. Taking the air conditioning system in Figure 3 as a one-to-three (one outdoor unit corresponds to three indoor units) as an example, the expansion valve is set in the outdoor unit in order to store the liquid refrigerant in the indoor heat exchanger as much as possible to facilitate the shutdown of the air conditioning system. During heating, refrigerant leakage is detected based on the remaining refrigerant amount, and the air conditioning system can be controlled to perform heating. At this time, the flow direction of the refrigerant flows from the air pipe into the indoor heat exchanger, passes through the indoor heat exchanger, flows into the liquid pipe, and then flows through the expansion valve. Outdoor heat exchanger. That is, when the air conditioning system is heating, the refrigerant first passes through the air pipe, enters the indoor heat exchanger, and then comes out of the indoor unit heat exchanger and enters the liquid pipe. The temperature is set in the inlet pipe of the indoor heat exchanger of each indoor unit. The sensor is used to detect the (air pipe) temperature of the inlet pipe. Similarly, a temperature sensor is also installed on the outlet pipe of the indoor heat exchanger of each indoor unit to detect the (liquid pipe) temperature of the outlet pipe. This is used to detect temperature changes.

Since the high-temperature gaseous refrigerant passes through the indoor heat exchanger and is then cooled by the fan, the temperature difference between the air pipe and the liquid pipe is large, and the refrigerant will change from gaseous to liquid. In order to store liquid refrigerant in the indoor heat exchanger, the opening of the expansion valve on the liquid pipe can be adjusted when the air conditioning system is heating, so that the temperature difference between the air pipe temperature and the liquid pipe temperature is as large as possible. For example, for commercial air conditioners, the opening of the expansion valve corresponding to each indoor unit can be made smaller to reduce the flow of liquid refrigerant through the expansion valve, or the fan gear of each indoor unit can be increased to increase the fan speed. Larger, the heat exchange is more complete, and the difference between the air pipe temperature and the liquid pipe temperature is as large as possible. For household air conditioners, the expansion valve is set in the outdoor unit. The opening of the expansion valve corresponding to the outdoor unit can be made smaller to reduce the flow of liquid refrigerant through the expansion valve, or the fan speed of the outdoor unit can be increased. The increase in fan speed makes the heat exchange more complete, making the difference between the air pipe temperature and the liquid pipe temperature as large as possible, so that the liquid refrigerant can be stored in the indoor heat exchanger.

Before refrigerant leak detection, in order to reduce the impact of refrigerant movement, the air conditioning system needs to be controlled to stop heating. When the following conditions are met, confirm that the refrigerant leak detection conditions are met and control the air conditioning system to stop heating. When the heating time of the air conditioning system reaches a certain time (such as the first preset time, 30 minutes), or when the air conditioning system is heating, the opening of the expansion valve on the liquid pipe is adjusted to increase the opening of the inlet pipe of the indoor unit. When the difference between the temperature and the temperature of the outlet pipe is greater than the temperature difference threshold (such as the first preset temperature difference threshold, 10K), the air conditioning system is controlled to stop heating. When the air conditioning system stops heating, it means that the compressor of the air conditioning system stops running, the outdoor fan stops running, the indoor fan stops running, etc.

In addition, when the air conditioning system is heating, if it is necessary to run defrost or oil return mode, then heating will be performed after the air conditioning system completes defrost mode or oil return, and the operating time needs to be re-accumulated. Similarly, the liquid pipe The expansion valve also needs to be re-controlled. Until the heating time of the air conditioning system reaches 30 minutes or the temperature difference between the temperature of the inlet pipe and the temperature of the outlet pipe is greater than 10K, the air conditioning system is controlled to stop heating. That is, the compressor is controlled to stop running, the outdoor fan stops running, the indoor fan stops running, and when the air conditioning system stops heating, the expansion valve is controlled to close.

It should be noted that the heating operation time of the air conditioner can also be calculated by setting a timer. When the timer reaches the preset time, the air conditioning system is automatically controlled to stop heating for subsequent refrigerant leakage detection.

Specifically, the time of temperature change will be different according to the state of the refrigerant (the time to reach pressure equalization will be different according to the amount of refrigerant), so the refrigerant leakage detection will continue for 4 hours after the air conditioning system stops heating to detect Is there any refrigerant leakage?

According to one embodiment of the present disclosure, before acquiring the indoor ambient temperature, the temperature change of the inlet pipeline, and the temperature change of the outlet pipeline, detecting whether the refrigerant leaks includes: acquiring the current temperature of the inlet pipeline and/or the temperature change of the outlet pipeline. Current temperature; when the difference between the current temperature of the inlet pipeline and the temperature of the inlet pipeline when no leakage occurs is greater than the second preset temperature difference threshold and/or if the current temperature of the outlet pipeline is different from the temperature of the outlet pipeline when no leakage occurs When the temperature difference is greater than the second preset temperature difference threshold, refrigerant leakage is determined. The second preset temperature difference threshold is determined according to actual conditions.

That is to say, the current temperature of the inlet pipeline or the current temperature of the outlet pipeline, or the current temperature of the inlet pipeline and the current temperature of the outlet pipeline, is obtained through the temperature sensor. Compare the current temperature of the inlet pipeline with the temperature of the inlet pipeline when no leakage occurs. If the temperature difference between the two is large (greater than the second preset temperature difference threshold), it will be determined that the refrigerant inlet pipeline is leaking, or the refrigerant inlet pipeline will be leaked. If the current temperature of the outlet pipeline is compared with the temperature of the outlet pipeline when no leakage occurs, if the temperature difference between the two is large (greater than the second preset temperature difference threshold), it will be determined that the refrigerant outlet pipeline is leaking, or the current temperature will be changed. If the current temperature of the outlet pipe and the temperature of the inlet pipe are compared with the temperatures of the outlet pipe and the inlet pipe when no leakage occurs, if the temperature difference between the outlet pipe and the inlet pipe is large (greater than the second preset temperature difference threshold), it is determined that the refrigerant is leaking in the inlet pipeline and outlet pipeline.

According to an embodiment of the present disclosure, the method for detecting whether refrigerant leaks also includes: obtaining the indoor ambient temperature, the temperature change of the inlet pipeline, and the temperature change of the outlet pipeline; when the indoor ambient temperature is less than the first preset temperature, if the outlet pipe If the temperature of the pipeline accelerates and the temperature of the inlet pipeline drops normally, it is determined that a refrigerant leak occurs in the outlet pipeline; when the indoor ambient temperature is greater than or equal to the first preset temperature and less than the second preset temperature, if the temperature of the outlet pipeline accelerates drops and the temperature of the inlet pipe drops normally and then rises, then it is determined that a refrigerant leak occurs in the outlet pipe; when the indoor ambient temperature is greater than or equal to the second preset temperature, if the temperature of the outlet pipe rises and the temperature of the inlet pipe rises, Then it is determined that there is a refrigerant leakage in the outlet pipe. The first preset temperature and the second preset temperature are determined according to actual conditions.

According to an embodiment of the present disclosure, when the temperature of the outlet pipe of the indoor unit decreases at a rate greater than a set threshold, it is determined to be an accelerated decrease. Among them, the setting threshold can be determined according to the actual situation.

Specifically, since the amount of liquid refrigerant stored in the indoor unit will be different according to different indoor temperatures, the temperature changes of refrigerant leakage corresponding to different indoor temperatures will also be different. Therefore, the temperature changes of the indoor ambient temperature, liquid pipe temperature (outlet pipe temperature) and air pipe temperature (inlet pipe temperature) are needed to determine whether the refrigerant is leaking.

Due to different indoor ambient temperatures, the liquid refrigerant storage capacity of the corresponding indoor heat exchanger is different. For example, when the indoor ambient temperature is low, the difference between the inlet pipeline temperature and the outlet pipeline temperature is greater than a certain value (such as 3K), in the indoor heat exchanger, the heat exchange effect is better, the gaseous refrigerant will be condensed and has a tendency to liquefy; when the indoor ambient temperature is high, the difference between the air pipe temperature and the liquid pipe temperature is less than a certain value ( For example, 1K), the heat exchange in the indoor heat exchanger is insufficient, the gaseous refrigerant is not easily condensed, and the liquid refrigerant tends to vaporize; when the indoor ambient temperature is neither high nor low, the refrigerant in the indoor heat exchanger will Heat exchange, but due to the small amount of condensation, a small amount of liquid refrigerant will remain in the indoor heat exchanger. That is to say, the temperature difference between the inlet pipe temperature and the outlet pipe temperature is more than 3K, indicating that the indoor temperature is low and the gaseous refrigerant changes into liquid refrigerant to release heat. If the temperature difference between the inlet pipe temperature and the outlet pipe temperature does not change, for example, the difference is less than 1k, then the inlet pipe and the outlet pipe are almost at the same temperature, which means that the gaseous refrigerant coming in from the air pipe at high room temperature will not be Cooling, so it will not become liquid refrigerant (not easy to become), so there is less liquid refrigerant at high room temperature. Therefore, before judging whether refrigerant leakage occurs at the point to be measured based on the refrigerant state and temperature changes, it is also necessary to determine the current indoor ambient temperature and the condition of the refrigerant in the indoor heat exchanger.

The following describes in detail how to determine the refrigerant leakage in the liquid pipe or air pipe.

Specifically, as shown in Figure 4, taking commercial air conditioning detection as an example, the expansion valve is set in the indoor unit. When the current indoor ambient temperature is low room temperature (less than the first preset temperature), under normal circumstances, the liquid pipe temperature (The temperature of the outlet pipe) and the air pipe temperature (the temperature of the inlet pipe) will change according to the external environment, and the temperature will drop normally. If it is detected that the liquid pipe temperature accelerates to decrease (the temperature decrease rate is greater than the set threshold), and the air pipe temperature When it drops normally, it means that there is a leak in the liquid pipe, which causes more liquid refrigerant to absorb the heat of the surrounding environment and evaporate, and the temperature of the liquid pipe decreases at an accelerated rate. Since the air pipe is far away from the leakage place, the high-temperature gas refrigerant will be slowly cooled by the outside air temperature. The temperature drops normally as the external environment changes.

When the current indoor ambient temperature is medium room temperature (greater than or equal to the first preset temperature and less than the second preset temperature), under normal circumstances, the liquid pipe temperature and the air pipe temperature will change according to the external environment, and the temperature will drop normally, and if the detection When the liquid pipe temperature accelerates to decrease and the air pipe temperature rises after a normal decrease, it indicates that the liquid pipe is leaking, causing a small amount of liquid refrigerant to absorb heat from the surrounding environment and evaporate. The liquid pipe temperature accelerates to decrease. The air pipe temperature changes according to the external environment, and the temperature drops normally. After a small amount of liquid refrigerant evaporates, the high-temperature gaseous refrigerant remaining in the air pipe flows in, causing the temperature of the air pipe to rise.

When the current indoor ambient temperature is high room temperature (greater than or equal to the second preset temperature), under normal circumstances, the liquid pipe temperature and the air pipe temperature will change according to the external environment, and the temperature will drop normally. Since the indoor environment is at a high room temperature, the gaseous refrigerant coming in from the air pipe will not be cooled, so it will not turn into liquid refrigerant (it is not easy to turn into it), and there will be no liquid refrigerant passing through the indoor heat exchanger. At this time, if it is detected that the temperature of the liquid pipe rises and the temperature of the air pipe rises, it means that the liquid pipe leaks, causing the high-temperature gaseous refrigerant that has not been liquefied to flow into the indoor heat exchanger. The temperature rises, and the residual high-temperature gaseous refrigerant close to the compressor is The refrigerant flows into the air pipe and the temperature of the air pipe rises.

According to an embodiment of the present disclosure, detecting whether the refrigerant leaks includes: obtaining the indoor ambient temperature, the temperature change of the inlet pipeline, and the temperature change of the outlet pipeline; when the indoor ambient temperature is less than the first preset temperature, if the temperature of the outlet pipeline If the temperature drops and the temperature of the inlet pipe rises, it is determined that refrigerant leakage occurs in the inlet pipe; when the indoor ambient temperature is greater than or equal to the first preset temperature and less than the second preset temperature, if the temperature of the outlet pipe drops and the inlet pipe If the temperature rises normally, it is determined that refrigerant leakage occurs in the inlet pipeline; when the indoor ambient temperature is greater than or equal to the second preset temperature, if the temperature of the outlet pipeline drops and the temperature of the inlet pipeline rises, it is determined that refrigerant leakage occurs in the inlet pipeline .

Specifically, as shown in Figure 5, taking commercial air conditioning detection as an example, the expansion valve is set in the indoor unit. When the current indoor ambient temperature is low room temperature (less than the first preset temperature), under normal circumstances, the liquid pipe temperature (The temperature of the outlet pipe) and the air pipe temperature (the temperature of the inlet pipe) will change according to the external environment, and the temperature will drop normally. If it is detected that the temperature of the liquid pipe drops and the temperature of the air pipe rises, it means that the air pipe is leaking, causing the indoor heat exchanger to The liquid refrigerant inside will evaporate at the location of the air pipe leakage, and the temperature will drop. As the air pipe leaks, the refrigerant flow in the indoor heat exchanger will decrease. The residual high-temperature gaseous refrigerant close to the compressor will flow into the air pipe, causing the air pipe temperature to rise, and the liquid refrigerant will flow into the air pipe. The temperature drop caused by the evaporation of the refrigerant and the temperature rise caused by the inflow of high-temperature gaseous refrigerant eventually cause the air pipe temperature to rise. The liquid pipe temperature still changes according to the external environment, and the temperature drops normally.

When the current indoor ambient temperature is medium room temperature (greater than or equal to the first preset temperature and less than the second preset temperature), under normal circumstances, the liquid pipe temperature and the air pipe temperature will change according to the external environment, and the temperature will drop normally, and if the detection When the temperature of the liquid pipe drops and the temperature of the gas pipe rises normally, it means that the gas pipe is leaking, causing the residual high-temperature gaseous refrigerant close to the compressor to flow into the gas pipe, causing the temperature to rise. The liquid refrigerant between the indoor heat exchanger and the expansion valve will evaporate and absorb The heat of the surrounding environment causes the nearby temperature to decrease, and the temperature of the detected liquid pipe decreases.

When the current indoor ambient temperature is high room temperature (greater than or equal to the second preset temperature), under normal circumstances, the liquid pipe temperature and the air pipe temperature will change according to the external environment, and the temperature will drop normally. If the liquid pipe temperature drops and the air pipe temperature rises, It means that the air pipe is leaking, causing the high-temperature gaseous refrigerant close to the compressor to flow into the air pipe, causing the temperature to rise. The liquid refrigerant between the indoor heat exchanger and the expansion valve will evaporate, absorbing heat from the surrounding environment and causing the nearby temperature to decrease. The detected liquid pipe Temperature drop.

It should be noted that for large-capacity indoor units, it takes time for the refrigerant pressure to reach a state of equalization, and it takes time for temperature changes to appear. Therefore, the air conditioning system needs to be stopped for a long time (when the indoor temperature and the temperature of the liquid pipe and air pipe become almost the same, that is, the pressure is equalized).

To sum up, according to the method for detecting the refrigerant leakage position according to the embodiment of the present disclosure, the air conditioning system is first controlled to perform heating so that the liquid refrigerant is stored inside the indoor unit, and then the heating time of the air conditioning system reaches the first At a preset time or when the difference between the temperature of the inlet pipeline and the temperature of the outlet pipeline is greater than the first preset temperature difference threshold, the air conditioning system is controlled to stop heating, and finally detects whether the refrigerant is leaking. Therefore, this method can detect whether the refrigerant leaks based on the refrigerant state and temperature change of the point to be detected, so as to determine the leakage location when the refrigerant leaks, improves the detection efficiency of refrigerant leakage, shortens the detection work time, and facilitates after-sales maintenance. , eliminate safety hazards.

Corresponding to the above embodiments, the present disclosure also provides a computer-readable storage medium.

The computer-readable storage medium of the present disclosure stores a program for detecting a refrigerant leakage location. When the program for detecting a refrigerant leakage location is executed by a processor, the above-mentioned method for detecting a refrigerant leakage location is implemented.

Corresponding to the above embodiments, the present disclosure also proposes an air conditioning system.

As shown in FIG. 6 , the air conditioning system 100 of the present disclosure may include: a memory 110 , a processor 120 , and a program stored on the memory 110 and executable by the processor 120 for detecting a refrigerant leakage location. The processor 120 executes a program for detecting a refrigerant leakage. When programming the refrigerant leakage location, implement the above-mentioned method for detecting the refrigerant leakage location.

The air conditioning system of the embodiment of the present disclosure, by executing the above method for detecting the location of refrigerant leakage, can detect refrigerant leakage based on the refrigerant state and temperature change of the point to be detected, which improves the detection efficiency of refrigerant leakage and facilitates after-sales maintenance. Eliminate safety hazards.

It should be noted that the logic and/or steps represented in the flowcharts or otherwise described herein, for example, may be considered to be a sequenced list of executable instructions for implementing logical functions, which may be embodied in any computer. in a readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other system that can retrieve and execute instructions from the instruction execution system, apparatus, or device) Used by instruction execution systems, devices or equipment. For the purposes of this specification, a "computer-readable medium" may be any device that can contain, store, communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. More specific examples (non-exhaustive list) of computer readable media include the following: electrical connections with one or more wires (electronic device), portable computer disk cartridges (magnetic device), random access memory (RAM), Read-only memory (ROM), erasable and programmable read-only memory (EPROM or flash memory), fiber optic devices, and portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium may even be paper or other suitable medium on which the program may be printed, as the paper or other medium may be optically scanned, for example, and subsequently edited, interpreted, or otherwise suitable as necessary. process to obtain the program electronically and then store it in computer memory.

It should be understood that various parts of the present disclosure may be implemented in hardware, software, firmware, or combinations thereof. In the above embodiments, various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if it is implemented in hardware, as in another embodiment, it can be implemented by any one or a combination of the following technologies known in the art: a logic gate circuit with a logic gate circuit for implementing a logic function on a data signal. Discrete logic circuits, application specific integrated circuits with suitable combinational logic gates, programmable gate arrays (PGA), field programmable gate arrays (FPGA), etc.

In the description of this specification, reference to the terms "one embodiment," "some embodiments," "an example," "specific examples," or "some examples" or the like means that specific features are described in connection with the embodiment or example. , structures, materials, or features are included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

In addition, the terms “first” and “second” are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Therefore, features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present disclosure, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically limited.

In this disclosure, unless otherwise explicitly stated and limited, the terms "installation", "connection", "connection", "fixing" and other terms should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. , or integrated into one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two elements or an interactive relationship between two elements, unless otherwise specified limitations. For those of ordinary skill in the art, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

Although the embodiments of the present disclosure have been shown and described above, it can be understood that the above-mentioned embodiments are illustrative and should not be construed as limitations of the present disclosure. Those of ordinary skill in the art can make modifications to the above-mentioned embodiments within the scope of the present disclosure. The embodiments are subject to changes, modifications, substitutions and variations.

Claims

Methods used to detect the location of refrigerant leaks include:

Determine the status of the refrigerant flowing through the point to be measured;

Detect the temperature change of the point to be measured;

Determine whether refrigerant leakage occurs at the point to be measured based on the refrigerant state and the temperature change.
The method according to claim 1, wherein the refrigerant state includes a gaseous state, a liquid state and a gas-liquid mixed state, wherein determining whether refrigerant leakage occurs at the point to be measured according to the refrigerant state and the temperature change includes:

When the refrigerant flowing through the point to be measured is in a gaseous state, if the temperature rise of the point to be measured is determined based on the temperature change, it is determined that a refrigerant leakage occurs at the point to be measured;

When the refrigerant flowing through the point to be measured is in a liquid state or a gas-liquid mixed state, if the temperature of the point to be measured drops based on the temperature change, it is determined that a refrigerant leakage occurs at the point to be measured.
The method according to claim 2, wherein detecting the temperature change of the point to be measured includes:

Obtain the current temperature of the point to be measured;

The current temperature is compared with the temperature of the point to be measured in a normal state without leakage to determine whether the temperature of the point to be measured rises or falls.
A method for detecting a refrigerant leakage location, the method is applied to an air conditioning system, the air conditioning system includes at least one indoor unit, the indoor unit includes an indoor heat exchanger, the air conditioning system further includes an exchanger with at least one of the indoor units. At least one expansion valve is provided corresponding to the heater. When the air conditioning system is heating, the inlet pipe of the indoor heat exchanger is provided with a first temperature sensor. The first temperature sensor is used to detect the inlet pipe. When the air conditioning system is heating, the outlet pipeline of the indoor heat exchanger is provided with a second temperature sensor. The second temperature sensor is used to detect the temperature of the outlet pipeline. Methods also include:

Control the air conditioning system to perform heating so that liquid refrigerant is stored inside the indoor unit;

When the heating time of the air conditioning system reaches the first preset time or the difference between the temperature of the inlet pipeline and the temperature of the outlet pipeline is greater than the first preset temperature difference threshold, the air conditioning system is controlled to stop heating. hot;

Check for refrigerant leaks.
The method according to claim 4, wherein when the air conditioning system performs heating, the opening of the expansion valve is adjusted to become smaller and/or the fan speed of the indoor unit becomes larger.
The method of claim 4, wherein the expansion valve is closed when the air conditioning system stops heating.
The method according to claim 4, wherein detecting whether the refrigerant leaks includes:

Obtain the indoor ambient temperature, the temperature change of the inlet pipeline, and the temperature change of the outlet pipeline;

When the indoor ambient temperature is lower than the first preset temperature, if the temperature of the outlet pipeline decreases at an accelerated rate and the temperature of the inlet pipeline decreases normally, it is determined that refrigerant leakage occurs in the outlet pipeline;

When the indoor ambient temperature is greater than or equal to the first preset temperature and less than the second preset temperature, if the temperature of the outlet pipe accelerates to decrease and the temperature of the inlet pipe rises again after a normal decrease, then it is determined that the Refrigerant leakage occurs in the outlet pipeline;

When the indoor ambient temperature is greater than or equal to the second preset temperature, if the temperature of the outlet pipe rises and the temperature of the inlet pipe rises, it is determined that refrigerant leakage occurs in the outlet pipe.
The method according to claim 7, wherein when the decreasing speed of the temperature of the outlet pipe of the indoor unit is greater than a set threshold, it is determined to be an accelerated decrease.
The method according to claim 4, wherein detecting whether the refrigerant leaks includes:

Obtain the indoor ambient temperature, the temperature change of the inlet pipeline, and the temperature change of the outlet pipeline;

When the indoor ambient temperature is lower than the first preset temperature, if the temperature of the outlet pipeline drops and the temperature of the inlet pipeline rises, it is determined that refrigerant leakage occurs in the inlet pipeline;

When the indoor ambient temperature is greater than or equal to the first preset temperature and less than the second preset temperature, if the temperature of the outlet pipe drops and the temperature of the inlet pipe rises normally, it is determined that the inlet pipe has occurred. Refrigerant leakage;

When the indoor ambient temperature is greater than or equal to the second preset temperature, if the temperature of the outlet pipe drops and the temperature of the inlet pipe rises, it is determined that refrigerant leakage occurs in the inlet pipe.
The method according to claim 8 or 9, wherein before obtaining the indoor ambient temperature, the temperature change of the inlet pipeline and the temperature change of the outlet pipeline, detecting whether the refrigerant leaks includes:

Obtain the current temperature of the inlet pipeline and/or the current temperature of the outlet pipeline;

When the difference between the current temperature of the inlet pipeline and the temperature of the inlet pipeline when no leakage occurs is greater than the second preset temperature difference threshold and/or if the current temperature of the outlet pipeline is different from the temperature when no leakage occurs. When the temperature difference of the outlet pipes is greater than the second preset temperature difference threshold, refrigerant leakage is determined.
The method of claim 4, wherein the duration of detecting whether the refrigerant leaks is at least four hours.
A computer-readable storage medium, the storage medium stores a program for detecting a refrigerant leakage position, and when the program for detecting a refrigerant leakage position is executed by a processor, the method according to any one of claims 1-11 is implemented. Method for detecting the location of refrigerant leakage.
An air conditioning system includes a memory, a processor, and a program for detecting a refrigerant leakage location stored in the memory and executable by the processor. When the processor executes the program for detecting a refrigerant leakage location, the method according to claim 1- The method for detecting refrigerant leakage location according to any one of 11.