WO2019042286A1

WO2019042286A1 - Air conditioner and fault detection and handling method for super-cooling tubing set thereof

Info

Publication number: WO2019042286A1
Application number: PCT/CN2018/102766
Authority: WO
Inventors: 杨中锋; 王彦生; 曾福祥; 刘超超
Original assignee: 青岛海尔空调器有限总公司
Priority date: 2017-08-30
Filing date: 2018-08-28
Publication date: 2019-03-07
Also published as: CN107560073B; CN107560073A

Abstract

A fault detection and handling method for a super-cooling tubing set of an air conditioner, comprising: turning on an air conditioner for heating; recording the time required from the start of heating to stabilization of an exhaust temperature of a compressor (100); determining whether the time required for stabilization is less than a first preset time or not; if yes, obtaining a theoretical minimum value of the exhaust temperature; determining whether the exhaust temperature in a stable state is less than the theoretical minimum value of the exhaust temperature or not; and if yes, determining that a fault occurs to a check valve (430) in the super-cooling tubing set (400). Also provided is an air conditioner for implementing the method. The method and the air conditioner can accurately determine whether a fault occurs to a check valve in the super-cooling tubing set or not, so as to handle the fault in time and prevent the fault of the check valve affecting the heating effect of the air conditioner.

Description

Fault detection and treatment method for air conditioner and supercooled tube group

Technical field

The invention relates to the field of air conditioners, and in particular to a fault detection and processing method for an air conditioner and a supercooled tube set thereof.

Background technique

During the use of the heat pump air conditioner, the check valve in the supercooled tube group sometimes fails and cannot work normally. Specifically, the valve core of the check valve cannot be reset, and the refrigerant opening cannot be normally closed. As a result, the secondary capillary in the supercooled tube group does not have a throttling effect during heating, which hinders the heat exchange of the refrigerant, which seriously affects the heating effect of the air conditioner and greatly reduces the user experience.

Most of the faults occur in new air conditioners. Because the components in the supercooled tube set are not fully meshed, there is a phenomenon that the valve cartridge cannot be reset, and the problem is basically not caused by the old running-in. This failure will greatly affect the heating performance of the air conditioner, so it is very important to detect it in time. If the fault is properly disposed, the supercooled tube group will return to normal. If the fault is not detected and repaired in time, the check valve may be permanently damaged. In addition, since the fault does not affect the operation of the air conditioner, and the frequency of occurrence is low, it is not easy to find, but the fault does affect the performance of the air conditioner, affecting the heating effect and the user experience, so how to detect it early and try to solve such problems to It is important.

Summary of the invention

In view of the above problems, the present invention has been made in order to provide a failure detecting and processing method for an air conditioner and a supercooled pipe group thereof that overcomes the above problems or at least partially solves the above problems.

It is an object of the invention to detect faults in a group of supercooled tubes.

Another object of the invention is to repair the failure of the supercooled tube set.

In one aspect, the present invention provides a fault detection and processing method for an air conditioning supercooled tube set, comprising: heating and heating of an air conditioner; recording a time required from the start of heating until the exhaust temperature of the compressor is stabilized; determining the time required for stabilization Whether it is less than the first preset time; if yes, obtaining the theoretical minimum value of the exhaust gas temperature; determining whether the exhaust gas temperature in the steady state is less than the theoretical minimum value of the exhaust gas temperature; and if so, determining that the one-way valve in the supercooled pipe group is faulty .

Optionally, after the step of determining that the one-way valve of the supercooled tube group fails, the method further includes: performing a repairing step of the supercooled tube group, the repairing step comprising: first converting the air conditioner into a cooling state, and then converting to a heating state again; After the exhaust gas temperature of the compressor is stabilized, the exhaust gas temperature is detected again; the theoretical minimum value of the exhaust gas temperature is obtained again; whether the exhaust gas temperature in the steady state is still less than the theoretical minimum value of the exhaust gas temperature; if so, the air conditioner is stopped and sent Information, prompting the user to check the one-way valve is damaged; or performing the repairing step of the cold tube group and its subsequent steps again; and if not, controlling the air conditioner to continue heating.

Optionally, the step of recording the time required for the exhaust gas temperature to stabilize from the start of heating to the compressor comprises: detecting the exhaust gas temperature of the compressor once every predetermined time period from the start of the air conditioning heating; calculating the adjacent two rows The difference between the gas temperatures; determining whether the difference between the last two detected exhaust temperatures is less than the preset temperature difference; if so, determining that the exhaust temperature is stable, calculating the last time from the start of heating to determining that the exhaust temperature is stable The time difference of the exhaust gas temperature of the compressor is detected as the time required for the exhaust gas temperature to stabilize; the exhaust gas temperature of the compressor detected last time before the exhaust gas temperature is stabilized is determined as the exhaust gas temperature at a steady state.

Optionally, the step of obtaining the theoretical minimum value of the exhaust gas temperature comprises: respectively detecting the indoor ambient temperature and the outdoor ambient temperature; and calculating the theoretical minimum value of the exhaust gas temperature according to the exhaust temperature mapping relationship according to the indoor ambient temperature and the outdoor ambient temperature.

Optionally, the step of first converting the air conditioner to the cooling state and then converting to the heating state again comprises: after the second preset time of the air conditioner is stopped, converting to the cooling state; and the air conditioner continues to cool for the third preset time and then stopping the second preset. Time, then convert to the heating state again.

In another aspect, the present invention also provides an air conditioner comprising: a refrigerant circulation system formed by sequentially connecting a compressor, an outdoor unit heat exchanger and an indoor unit heat exchanger; and a supercooled tube group disposed in the outdoor unit heat exchanger Downstream of the refrigerant flow path, the supercooled tube group includes: a main capillary tube, one end of which leads to the indoor unit heat exchanger, and the other end of which is connected to one end of the one-way valve; the sub-capillary tube is connected in parallel to both ends of the one-way valve; and the check valve , configured to allow only the refrigerant to flow in one direction from the outdoor heat exchanger to the indoor heat exchanger; the timing device is configured to record the time required from the start of the air conditioning heating to the stabilization of the exhaust temperature of the compressor; the exhaust gas temperature detection a device configured to detect an exhaust gas temperature of the compressor in a steady state; the main control device configured to obtain a theoretical minimum value of the exhaust gas temperature; and a row in which the exhaust gas temperature is stable for less than the first preset time and in a steady state When the gas temperature is less than the theoretical minimum value of the exhaust gas temperature, it is determined that the check valve has failed.

Optionally, the main control device is further configured to: after determining that the one-way valve of the supercooled tube group is faulty, control the air conditioning to perform the repairing step of the supercooled tube group, the repairing step includes: first converting the air conditioner to a cooling state, and then converting again The heating state; the exhaust gas temperature detecting device is further configured to detect the exhaust gas temperature in a stable state; the main control device is further configured to acquire the theoretical minimum value of the exhaust gas temperature; and the exhaust gas temperature in the steady state is still less than In the case of the lowest theoretical value of the exhaust gas temperature, the air conditioner is controlled to stop and send a message, prompting the user to repair the check valve or re-execute the repairing step of the supercooled tube group and its subsequent steps; and the exhaust gas temperature in the steady state is greater than the row In the case of the lowest value of the gas temperature theory, the air conditioner is controlled to continue to heat.

Optionally, the exhaust gas temperature detecting device is further configured to detect the exhaust gas temperature of the compressor once every predetermined time period from the start of the air conditioning heating; the main control device is further configured to calculate the difference between the adjacent two exhaust temperatures Value; determining that the exhaust gas temperature is stable in the case where the difference between the last two detected exhaust gas temperatures is less than the preset temperature difference; the timing device is further configured to calculate the last from the start of heating until the exhaust gas temperature is determined to be stable The time difference of the exhaust gas temperature of the compressor is detected once as the time required for the exhaust gas temperature to stabilize; the exhaust gas temperature detecting device is further configured to stabilize the exhaust gas temperature of the compressor detected last time before the exhaust gas temperature is stabilized. State of exhaust temperature.

Optionally, the air conditioner further includes: an indoor temperature detecting device configured to detect an indoor ambient temperature; an outdoor temperature detecting device configured to detect an outdoor ambient temperature; and a main control device electrically connected to the indoor temperature detecting device and the outdoor temperature detecting device, It is further configured to calculate a theoretical minimum value of the exhaust gas temperature according to the indoor temperature and the outdoor ambient temperature according to the exhaust gas temperature mapping relationship.

Optionally, the main control device is further configured to: after determining that the one-way valve of the supercooled tube group is faulty, control the air conditioner to stop for a second predetermined time, and then switch to a cooling state; and after controlling the air conditioner to continue cooling for a third preset time Stop for a second preset time and then switch to the heating state again.

In the method of the present invention, in the process of heating the air conditioner, it is determined whether the time required for the exhaust gas temperature to stabilize is less than the first preset time. When the one-way valve of the supercooled tube group in the heating state fails, the opening of the valve body cannot be normally closed, and the secondary capillary of the supercooled tube group cannot play a throttling effect, so that the flow rate of the refrigerant is too large, and the exhaust gas temperature can be quickly and stably stabilized. Therefore, if the time required for the exhaust gas temperature to stabilize is less than the first predetermined time, it is basically possible to determine that the check valve has failed. In order to further determine that the one-way valve has failed, the master device also calculates the theoretical minimum value of the exhaust gas temperature and compares the above-described exhaust gas temperature with the theoretical minimum value of the exhaust gas temperature. If the check valve fails, the secondary capillary cannot be throttled, and the exhaust temperature of the compressor is much lower than that at the normal heating. Therefore, when the exhaust gas temperature is lower than the theoretical minimum value of the exhaust gas temperature, it can be determined that the check valve has failed. The method of the invention determines whether the check valve is faulty by detecting the compressor exhaust gas temperature stabilization time and the steady state exhaust gas temperature and the theoretical minimum value of the exhaust gas temperature, and the detection process is simple and convenient, and can be determined without disassembling the machine. Whether the check valve in the cold pipe group has failed. The method of the invention is beneficial for detecting and handling faults in time, and preventing the one-way valve failure from affecting the heating effect of the air conditioner.

Further, the method of the present invention also includes the handling of a one-way valve failure. After determining that the check valve of the supercooled tube group has failed, the air conditioner first switches to the cooling state and then to the heating state again. After entering the cooling state, the refrigerant flows from the first port of the one-way valve to the second port, and the refrigerant exerts an impact force on the one-way valve to restore the misaligned valve core with a certain probability. The method of detecting the above failure is performed again after the heating is resumed. That is, the exhaust gas temperature detecting means detects the exhaust gas temperature in a steady state again; the main control device calculates the theoretical minimum value of the exhaust gas temperature again. If the exhaust gas temperature is still lower than the theoretical minimum value of the exhaust gas temperature, it proves that the valve core of the check valve is not restored. At this time, the air conditioner is stopped and the user is prompted to be damaged, and needs to be replaced. If the exhaust gas temperature is greater than the first preset temperature difference, it proves that the valve core of the check valve is restored and returns to normal, and the air conditioner can normally heat. When the method of the present invention uses the air conditioner to cool after the failure of the check valve of the supercooled tube group is determined, the impact force of the refrigerant on the check valve spool causes the spool to be reset, so that the check valve returns to normal.

The above as well as other objects, advantages and features of the present invention will become apparent to those skilled in the <

DRAWINGS

Some specific embodiments of the present invention will be described in detail, by way of example, and not limitation, The same reference numbers in the drawings identify the same or similar parts. Those skilled in the art should understand that the drawings are not necessarily drawn to scale. In the figure:

1 is a schematic view of an air conditioner according to an embodiment of the present invention;

2 is a schematic view of a refrigerant tube group during cooling of an air conditioner according to an embodiment of the present invention;

3 is a schematic view of a refrigerant tube group during heating of an air conditioner according to an embodiment of the present invention;

4 is a schematic diagram of a method for detecting and processing a fault of an air conditioning supercooled pipe group according to an embodiment of the present invention;

5 is a flow chart of a method of fault detection and processing of an empty supercooled tube set in accordance with another embodiment of the present invention.

Detailed ways

The embodiment of the invention firstly provides an air conditioner comprising: a refrigerant circulation system formed by sequentially connecting the compressor 100, the outdoor unit heat exchanger 200 and the indoor unit heat exchanger 300. The supercooled tube group 400 is disposed downstream of the refrigerant flow path of the outdoor unit heat exchanger 200, and the "downstream" refers to the refrigerant that directly or indirectly connects the subcooling tube group 400 to the outdoor unit heat exchanger 200 in the normal cooling state of the air conditioner. exit. In the cooling state, the refrigerant sequentially flows through the compressor 100, the outdoor unit heat exchanger 200, the supercooled tube group 400, and the indoor unit heat exchanger 300, and in the heating state, the refrigerant starts to circulate in the opposite direction from the compressor 100. . The supercooled tube group 400 includes a main capillary 410, a sub capillary 420, and a check valve 430.

One end of the main capillary 410 leads to the indoor unit heat exchanger 200, and the other end is connected to one end of the check valve 430. The sub-capillary 420 is connected in parallel to both ends of the check valve 430. The check valve 430 allows only the refrigerant to flow in one direction from the outdoor unit heat exchanger 200 to the indoor unit heat exchanger 300. Specifically, the one-way valve 430 has a first port 433 that connects the main capillary 410 and a second port 434 that leads to the outdoor unit heat exchanger 200. The check valve 430 described above includes a valve body 431, a valve body 432, and a spring. The valve body 432 is disposed inside the chamber of the valve body 431. The chamber interior also has an opening 435 for circulating refrigerant. The valve core 432 can move along the extending direction of the chamber when the refrigerant flows from the second port 434 to the first port 433. The spool 432 is moved toward the first port 433 by the impact of the refrigerant, and the opening 435 is kept open to allow the refrigerant to flow. When the refrigerant flows from the first port 433 to the second port 434, the spool 432 is blocked by the impact of the refrigerant. 435, to prevent the circulation of refrigerant. The spring is used to provide a restoring force to the spool 432 to move toward the opening 435, so that the spool 432 returns to the position blocking the opening 435 when it is not subjected to the refrigerant. In other embodiments of the present invention, the one-way valve 430 may also not include a spring, that is, the one-way valve 430 includes only the valve body 431 and the valve body 432. The spool 432 is completely restored by the impact force of the refrigerant at the time of heating.

The normal working principle of the supercooled tube set 400 of the present embodiment is: when the air conditioner is cooled, as shown in FIG. 1, the refrigerant flows from the second port 434 to the first port 433, the check valve 430 is turned on, and the refrigerant is controlled by the check valve. The 430 enters the main capillary 410, so the secondary capillary 420 does not have any effect. When the air conditioner is heating, as shown in FIG. 2, the refrigerant flows from the first port 433 to the second port 434, the check valve 430 is closed, the refrigerant is forced into the sub-capillary 420, and the sub-capillary 420 functions as a throttle. However, in some cases (for example, if the spring fails or the spool 432 of the check valve 430 fails to be normally reset due to a problem such as a lack of precision in the manufacture of the spool 432), a check valve 430 may occur when the air conditioner is heating. The spool 432 does not completely block the opening 435, causing the refrigerant to circulate through the one-way valve 430, so that the sub-capillary 420 does not function at all. If the sub-capillary 420 does not function as a throttling, the resistance of the refrigerant flow becomes small, and the exhaust temperature of the compressor 100 can quickly reach a steady state, at which time the exhaust gas temperature is compared with the normal heating of the air conditioner (that is, the check valve When 430 is normal, the exhaust temperature will be much smaller, resulting in a sharp drop in heating efficiency. The air conditioner of the embodiment can detect the failure of the check valve 430 in the supercooled tube group 400 in time to prevent the check valve 430 from being adversely affected by the heating effect.

The air conditioner of this embodiment further includes a timing device 110, an exhaust gas temperature detecting device 120, an indoor temperature detecting device 310, an outdoor temperature detecting device 320, and a main control device 500. The timing device 110 is configured to record the time required from the start of the air-conditioning heating to the stabilization of the exhaust temperature of the compressor 100, and the timing device 110 may be a timer or a built-in clock of the air conditioner or the like. The exhaust gas temperature detecting device 120 is configured to detect the exhaust gas temperature of the compressor 100 in a steady state, and the exhaust gas temperature detecting device 120 may be a temperature sensor provided at the exhaust port of the compressor 100. The indoor temperature detecting device 310 is for detecting the indoor environmental temperature, and the indoor temperature detecting device 310 may be a temperature sensor provided on the surface of the air conditioning indoor unit. The outdoor temperature detecting device 320 is for detecting the outdoor ambient temperature, and the outdoor temperature detecting device 320 may be a temperature sensor provided on the surface of the outdoor unit of the air conditioner. The main control device 500 is electrically connected to the indoor temperature detecting device 310 and the outdoor temperature detecting device 320, receives indoor and outdoor temperature data, and calculates a theoretical minimum value of the exhaust gas temperature through the indoor ambient temperature and the outdoor ambient temperature. The master device 500 is further configured to determine that the one-way valve 430 has failed when the exhaust gas temperature at the time of stabilization is less than the theoretical minimum value of the exhaust gas temperature.

When the air conditioner is just beginning to heat up, the refrigerant circulation needs to be stabilized for a period of time, so the exhaust temperature of the compressor 100 also continuously changes during the period in which the air conditioner just starts to heat up, and then stabilizes. In the present embodiment, the exhaust gas temperature detecting means 120 detects the exhaust gas temperature of the compressor 100 every time a predetermined period of time starts from the air-conditioning heating, for example, every 1 s, to obtain an exhaust gas temperature value. As the heating time increases, the exhaust gas temperature detecting device 120 detects a set of temperature values that continuously change over time. The exhaust gas temperature detecting device 120 also transmits the plurality of temperature values to the main control device 500, and the main control device 500 performs one-step processing on the data.

The main control device 500 may be a computer board of an air conditioner. The master device 500 is further configured to calculate a difference in temperature between adjacent two exhaust gases; and in a case where the difference between the last two detected exhaust gas temperatures is less than a preset temperature difference, it is determined that the exhaust gas temperature is stable. Whenever the exhaust gas temperature detecting device 120 detects a new exhaust gas temperature, the main control device 500 calculates the difference between the last two (or the latest two) detected exhaust gas temperatures, if the above temperature difference is less than the preset temperature Poor, it is proved that the exhaust gas temperature tends to be stable, and the above preset temperature difference can be set to 1 °C. The exhaust gas temperature detected last time before stabilization can be used as the exhaust gas temperature in the steady state. The timing device 110 calculates the time difference from the last detection of the exhaust gas temperature from the start of heating to the stabilization of the exhaust gas temperature as the time required for the exhaust gas temperature to stabilize.

The main control device 500 first determines whether the time required for the exhaust gas temperature to stabilize is less than the first preset time. When the one-way valve 430 of the supercooled tube group 400 in the heating state fails, the opening 435 of the valve body 431 cannot be normally closed, and the sub-capillary 420 of the supercooled tube group 400 cannot be throttled, causing the refrigerant flow to be too large. The gas temperature is fast and stable. Therefore, if the time required for the exhaust gas temperature to stabilize is less than the first predetermined time, it is basically possible to determine that the check valve 430 has failed. In order to further determine that the one-way valve 430 has failed, the master device 500 also calculates a theoretical minimum value of the exhaust gas temperature and determines whether the exhaust gas temperature reaches a theoretical minimum value of the exhaust gas temperature. Since the exhaust temperature of the compressor is normally related to the outdoor ambient temperature and the indoor ambient temperature, in the present embodiment, the theoretical minimum value of the exhaust gas temperature can be calculated based on the indoor ambient temperature and the outdoor ambient temperature. Specifically, the theoretical minimum value of the exhaust gas temperature is calculated by the following formula (or mapping relationship):

Pmin=x+1.5y+c;

Wherein, the value of c is a constant, determined according to the specific model of the air conditioner (for example, the value of c for a fixed-frequency air conditioner may be 22), and the value of c increases with the increase of the air-conditioning system (the number of air-conditioning units), and the frequency conversion The air conditioner c value is higher than the fixed frequency air conditioner; Pmin is the theoretical minimum value of the exhaust gas temperature, x is the indoor ambient temperature, y is the outdoor ambient temperature, and the values of x and y are within the allowable ambient temperature range of the air conditioner.

When the air conditioner is normally heating, the exhaust temperature of the compressor should be kept above the theoretical minimum of the above exhaust temperature. If the check valve 430 fails, the sub-capillary 420 does not function as a throttle, and the exhaust temperature of the compressor 100 is much smaller than that at the time of normal heating. Therefore, when the actual exhaust temperature of the compressor is less than the theoretical minimum value of the exhaust gas temperature, it can be determined that the check valve 430 has failed.

After detecting the failure of the check valve 430, the air conditioner of the embodiment can further perform fault processing to repair the check valve 430 in time. After determining that the check valve 430 of the supercooled tube group 400 has failed, the main control device 500 controls the air conditioner to first switch to the cooling state and then to the heating state again. Specifically, the main control device 500 controls the air conditioner to stop for a second predetermined time, and then converts to a cooling state; and controls the air conditioner to continue to cool for a third preset time, then stops for a second preset time, and then switches to the heating state again. In this embodiment, the second preset time may be 1 min, and the third preset time may be 2 min.

The failure of the check valve 430 described above is mostly caused by the spring twist being stuck or due to the lack of precision of the spool 432, and the spool 432 of the check valve 430 cannot normally reset the closed opening 435. In this embodiment, after the fault is detected by the main control board, the repairing step of the supercooled tube group is performed. The repairing step specifically includes: stopping the second preset time first, and then controlling the four-way valve to revert, so that the air conditioner enters the cooling state. . After entering the cooling state, the refrigerant flows from the first port 433 to the second port 434, and the refrigerant applies an impact force to the check valve 430 to restore the misaligned spool 432 with a certain probability.

The second preset time is stopped after the third preset time of cooling, and then converted to the heating state again. Since the air conditioner should not be directly converted from the cooling state to the heating state, in order to prevent damage to the air conditioner, after the cooling is completed, it is necessary to stop the second preset time before starting to heat up. After reheating, the above method of fault detection is performed again. That is, the exhaust gas temperature detecting means 120 detects the exhaust gas temperature in a stable state again; the indoor temperature detecting means 310 detects the indoor environmental temperature again, and the outdoor temperature detecting means 320 detects the outdoor ambient temperature again. The main control device calculates the theoretical minimum value of the exhaust gas temperature based on the newly detected indoor ambient temperature and outdoor ambient temperature. The main control device 500 controls the air conditioner to stop and sends information when the stable exhaust gas temperature is lower than the theoretical minimum value of the exhaust gas temperature, prompts the user to damage the check valve 430, or performs the repairing step of the supercooled tube group and its subsequent steps. step. If the exhaust gas temperature is still lower than the theoretical minimum value of the exhaust gas temperature, it is proved that the valve body 432 of the one-way valve 430 is not restored. At this time, the air conditioner is stopped and the user is prompted to be damaged, the need to replace, or the check valve is re-read. 430 for repair. The above prompt information can be displayed through the air conditioning panel. If the exhaust gas temperature is greater than the theoretical minimum value of the exhaust gas temperature, it is proved that the valve body 432 of the check valve 430 is restored and returned to normal, and the air conditioner can normally heat.

The invention also provides a fault detection and processing method for the air conditioning supercooled tube set 400. 4 is a schematic diagram of a method of fault detection and processing of an air conditioning supercooled tube set 400 in accordance with one embodiment of the present invention. The detecting method of this embodiment may generally include the following steps:

In step S402, the air conditioner turns on the heating. When the air conditioner is heated, the refrigerant flows through the compressor 100, the indoor unit heat exchanger 300, the supercooled tube group 400, and the outdoor unit heat exchanger 200 in this order.

At step S404, the time required from the start of heating to the temperature of the exhaust of the compressor 100 is recorded. When the air conditioner is just beginning to heat up, the refrigerant circulation needs to be stabilized for a period of time, so the exhaust temperature of the compressor 100 also continuously changes during the period in which the air conditioner just starts to heat up, and then stabilizes.

Step S406, determining whether the time required for the stabilization is less than the first preset time. When the one-way valve 430 of the supercooled tube group 400 in the heating state fails, the opening 435 of the valve body 431 cannot be normally closed, and the sub-capillary 420 of the supercooled tube group 400 cannot be throttled, causing the refrigerant flow to be too large. The gas temperature is fast and stable.

In step S408, if the result of the determination in step S406 is YES, the exhaust gas temperature in the steady state is detected. If the time required for the exhaust gas temperature to stabilize is less than the first predetermined time, it is basically possible to determine that the check valve 430 has failed. To further determine that the one-way valve 430 has failed, the master device 500 also compares the steady state exhaust temperature to the calculated theoretical minimum exhaust gas temperature.

In step S410, if the result of the determination in the step S406 is NO, the check valve 430 does not malfunction, and the air conditioner continues to heat normally.

In step S412, the theoretical minimum value of the exhaust gas temperature is calculated. Calculate the lowest value that the exhaust gas temperature should reach when the air conditioner is heating normally.

In step S414, it is determined whether the stabilized exhaust gas temperature is less than the theoretical minimum value of the exhaust gas temperature.

In step S416, if the result of the determination in step S414 is YES, it is determined that the check valve 430 in the supercooled tube group 400 has failed. If the check valve 430 fails, the sub-capillary 420 does not function as a throttle, and the exhaust temperature of the compressor 100 is much smaller than that at the time of normal heating. Therefore, when the exhaust gas temperature at the time of stabilization is smaller than the theoretical minimum value of the exhaust gas temperature, it can be determined that the check valve 430 is malfunctioning.

FIG. 5 is a flow chart of a method for detecting and processing a fault of an air conditioning supercooled tube set 400 according to an embodiment of the present invention, the control method sequentially performing the following steps:

In step S502, the exhaust gas temperature of the compressor 100 is detected once every predetermined time period from the start of heating of the air conditioner. Starting from the heating of the air conditioner, the exhaust gas temperature of the compressor 100 is detected once every predetermined time interval, for example, every 1 s to obtain an exhaust gas temperature value. As the heating time increases, a set of temperature values that change continuously over time is detected.

Step S504, calculating a difference between adjacent two exhaust gas temperatures. Each time the detecting device detects a new exhaust gas temperature, the difference between the last two detected exhaust gas temperatures is calculated.

Step S506, determining whether the difference between the last two detected exhaust gas temperatures is less than a preset temperature difference.

In step S508, if the result of the determination in step S506 is YES, it is determined that the exhaust gas temperature is stable, and the time difference from the last detection of the exhaust gas temperature from the start of heating to the stabilization of the exhaust gas temperature is calculated as the time required for the exhaust gas temperature to stabilize. If the temperature difference is less than the second predetermined value, it is proved that the exhaust temperature tends to be stable, and the preset temperature difference may be set to 1 °C. Calculate the time difference between the last detection of the exhaust gas temperature from the start of heating until the exhaust gas temperature is stabilized as the time required for the exhaust gas temperature to stabilize, and the exhaust gas temperature of the compressor 100 that was last detected before the exhaust gas temperature is stabilized is stabilized. State of exhaust temperature. If the result of the determination in the step S506 is NO, it is proved that the exhaust gas temperature has not stabilized, and the value of the exhaust gas temperature is continuously collected.

In step S510, it is determined whether the time required for stabilization is less than the first preset time.

Step S512, if the result of the determination in step S510 is YES, the indoor ambient temperature and the outdoor ambient temperature are respectively detected; and the theoretical minimum value of the exhaust gas temperature is calculated according to the exhaust temperature mapping relationship. Since the exhaust temperature of the compressor is normally related to the outdoor ambient temperature and the indoor ambient temperature, in the present embodiment, the theoretical minimum value of the exhaust gas temperature can be calculated based on the indoor ambient temperature and the outdoor ambient temperature. Specifically, the theoretical minimum value of the exhaust gas temperature is calculated by the following formula (or mapping relationship):

Pmin=x+1.5y+c;

Wherein, the value of c is a constant, determined according to the specific model of the air conditioner (for example, the value of c for a fixed-frequency air conditioner may be 22), and the value of c increases with the increase of the air-conditioning system (the number of air-conditioning units), and the frequency conversion The air conditioner c value is higher than the fixed frequency air conditioner; x is the indoor ambient temperature, y is the outdoor ambient temperature, and the values of x and y are within the allowable ambient temperature range of the air conditioner.

In step S514, if the result of the determination in step S510 is NO, it is proved that the check valve 430 has not failed, and the air conditioner is controlled to continue heating.

In step S516, it is determined whether the stabilized exhaust gas temperature is less than the theoretical minimum value of the exhaust gas temperature.

Step S518, if the result of the determination in step S516 is YES, it is determined that the check valve 430 in the supercooled tube group 400 has failed. If the result of the determination in the step S516 is NO, it is proved that the check valve 430 has not failed, and the air conditioner is controlled to continue heating.

In step S520, after the second preset time is stopped, the air conditioner is switched to the cooling state. After determining that the one-way valve 430 has failed, it is necessary to process the fault so that the check valve 430 returns to normal as much as possible. The processing process is specifically: first controlling the air conditioner to stop for a second preset time, and then converting to a cooling state. The second preset time is stopped to prevent the air conditioner from directly switching from the heating state to the cooling state. The failure of the check valve 430 described above is mostly caused by the spring twist being stuck or due to the lack of precision of the spool 432, and the spool 432 of the check valve 430 cannot normally reset the closed opening 435. In this embodiment, after the main control board detects the fault, the second preset time is stopped first, and then the four-way valve is reversed to make the air conditioner enter the cooling state. After entering the cooling state, the refrigerant flows from the first port 433 to the second port 434, and the refrigerant applies an impact force to the check valve 430 to cause the misaligned check valve 430 to recover with a certain probability.

Step S522, the air conditioner continues to cool for a third preset time and then stops for a second preset time, and then converts to the heating state again.

Step S524, after the exhaust gas temperature of the compressor 100 is stabilized, the exhaust gas temperature is detected again and the theoretical minimum value of the exhaust gas temperature is calculated. That is, the current indoor ambient temperature and the outdoor ambient temperature are re-acquired, and the theoretical minimum value of the exhaust gas temperature is calculated again.

In step S526, it is determined whether the stabilized exhaust gas temperature is still less than the theoretical minimum value of the exhaust gas temperature.

In step S528, if the result of the determination in the step S526 is YES, the air conditioner is stopped and the information is sent, and the user is prompted to the check valve 430 to be damaged or to perform the repairing step of the supercooled tube group again. If the exhaust gas temperature is still lower than the theoretical minimum value of the exhaust gas temperature, it is proved that the above process does not restore the valve body 432 of the check valve 430, and the check valve 430 may be mechanically damaged. At this time, the air conditioner may be stopped and prompted. The user check valve 430 is damaged and needs to be replaced, and the repairing step of the above-mentioned supercooled tube group can also be performed. The above repairing step may be performed continuously for a plurality of times until the one-way valve 430 returns to normal, and may also be executed a preset number of times (for example, three times). If the exhaust gas temperature is still less than the theoretical minimum value of the exhaust gas temperature after the preset number of times is executed, The air conditioner is controlled to stop and the user is prompted to damage the check valve 430, which needs to be replaced. If the result of the determination in the step S526 is NO, that is, the exhaust gas temperature is greater than the theoretical minimum value of the exhaust gas temperature, it is proved that the above-described processing is effective, and the valve body 432 of the check valve 430 has been restored. When the air conditioner returns to normal, the air conditioner can continue to heat normally.

In this regard, it will be appreciated by those skilled in the <RTIgt;the</RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; The content directly determines or derives many other variations or modifications consistent with the principles of the invention. Therefore, the scope of the invention should be understood and construed as covering all such other modifications or modifications.

Claims

A fault detection and processing method for an air conditioning supercooled pipe group, comprising:

Air conditioning turns on heating;

Recording the time required from the start of heating to the stabilization of the exhaust temperature of the compressor;

Determining whether the time required for stabilization is less than the first preset time;

If yes, obtain the theoretical minimum value of the exhaust gas temperature;

Determining whether the exhaust gas temperature in a steady state is less than a theoretical minimum value of the exhaust gas temperature;

If so, it is determined that the one-way valve in the supercooled tube group has failed.
The fault detection and processing method according to claim 1, further comprising: after determining the step of the failure of the one-way valve of the supercooled tube group:

Performing the repairing step of the supercooled tube group, the repairing step includes: first converting the air conditioner to a cooling state, and then converting to a heating state again;

After the exhaust gas temperature of the compressor is stabilized, the exhaust gas temperature is detected again;

Obtaining the theoretical minimum value of the exhaust gas temperature again;

Determining whether the exhaust gas temperature in a steady state is still less than the theoretical minimum value of the exhaust gas temperature;

If yes, controlling the air conditioner to stop and sending a message, prompting the user that the one-way valve is damaged; or performing the repairing step of the supercooled tube group and subsequent steps thereof;

If not, control the air conditioner to continue heating.
The failure detecting and processing method according to claim 1, wherein the step of recording the time required from the start of heating to the temperature of the exhaust of the compressor is stabilized comprises:

Starting from the heating of the air conditioner, detecting the exhaust temperature of the compressor every predetermined period of time;

Calculating the difference between adjacent exhaust temperatures;

Determining whether the difference between the last two detected exhaust temperatures is less than a preset temperature difference;

If yes, determining that the exhaust gas temperature is stable, calculating a time difference from the start of heating to determining that the exhaust gas temperature of the compressor is last detected before the exhaust gas temperature is stabilized as a time required for the exhaust gas temperature to stabilize; The exhaust gas temperature of the compressor last detected before the exhaust gas temperature is stabilized is determined as the exhaust gas temperature in a steady state.
The fault detection and processing method according to claim 1, wherein the step of acquiring the theoretical minimum value of the exhaust gas temperature comprises:

Detecting indoor ambient temperature and outdoor ambient temperature separately;

The theoretical minimum value of the exhaust gas temperature is calculated according to the exhaust gas temperature mapping relationship according to the indoor ambient temperature and the outdoor ambient temperature.
The failure detecting and processing method according to claim 2, wherein the step of first converting the air conditioner to the cooling state and then converting to the heating state again comprises:

After the second preset time of the air conditioner is stopped, it is converted into a cooling state;

The air conditioner continues to cool for a third preset time and then stops for a second preset time, and then converts to the heating state again.
An air conditioner comprising:

a refrigerant circulation system formed by sequentially connecting a compressor, an outdoor unit heat exchanger and an indoor unit heat exchanger;

The supercooled tube group is disposed downstream of the outdoor unit heat exchanger refrigerant flow path, and the supercooled tube group includes:

a main capillary, one end of which leads to the indoor heat exchanger, and the other end of which is connected to one end of the one-way valve;

a secondary capillary parallel to both ends of the one-way valve; and

The one-way valve is configured to allow only one-way circulation of refrigerant from the outdoor unit heat exchanger to the indoor unit heat exchanger;

a timing device configured to record a time required from the start of air conditioning heating to the stabilization of the exhaust temperature of the compressor;

An exhaust gas temperature detecting device configured to detect an exhaust gas temperature of the compressor in a steady state;

The main control device is configured to obtain a theoretical minimum value of the exhaust gas temperature; when the exhaust gas temperature is stable for less than the first preset time and the exhaust gas temperature in the steady state is less than the theoretical minimum value of the exhaust gas temperature, determining The one-way valve malfunctions.
The air conditioner according to claim 6, wherein

The main control device is further configured to, after determining that the one-way valve of the supercooled tube group is faulty, control the air conditioner to perform the repairing step of the supercooled tube group, the repairing step comprising: first converting the air conditioner into Cooling state, and then converted to heating state again;

The exhaust gas temperature detecting device is further configured to detect the exhaust gas temperature in a stable state again;

The main control device is further configured to acquire the theoretical minimum value of the exhaust gas temperature again; when the exhaust gas temperature in the steady state is still less than the theoretical minimum value of the exhaust gas temperature, the air conditioner is controlled to stop and send information to The user prompts that the one-way valve is damaged or performs the repairing step of the supercooled tube group and its subsequent steps again; and in the case that the exhaust gas temperature in the steady state is greater than the theoretical minimum value of the exhaust gas temperature, the control The air conditioner continues to heat up.
The air conditioner according to claim 6, wherein

The exhaust gas temperature detecting device is further configured to detect the exhaust gas temperature of the compressor every time a predetermined period of time starts from the heating of the air conditioner;

The main control device is further configured to calculate a difference between two adjacent exhaust temperatures; and determine the exhaust temperature when a difference between the last two detected exhaust temperatures is less than a preset temperature difference stable;

The timing device is further configured to calculate a time difference from the start of heating to the last detection of the exhaust gas temperature of the compressor before the exhaust gas temperature is stabilized as a time required for the exhaust gas temperature to stabilize;

The exhaust gas temperature detecting device is further configured to determine an exhaust gas temperature of the compressor that is detected last time before the exhaust gas temperature is stabilized as the exhaust gas temperature in a steady state.
The air conditioner according to claim 6, further comprising:

An indoor temperature detecting device configured to detect the indoor ambient temperature;

An outdoor temperature detecting device configured to detect the outdoor ambient temperature;

The main control device is electrically connected to the indoor temperature detecting device and the outdoor temperature detecting device, and is further configured to calculate the theoretical minimum value of the exhaust gas temperature according to the exhaust temperature mapping relationship according to the indoor ambient temperature and the outdoor ambient temperature. .
The air conditioner according to claim 7, wherein

The main control device is further configured to: after determining that the check valve of the supercooled tube group is faulty, after controlling the air conditioner to stop for a second predetermined time, converting to a cooling state; controlling the air conditioner to continue cooling for a third preset time Stop for a second preset time and then switch to the heating state again.