CN113280470B - Four-way valve fault detection method and device and air conditioner - Google Patents
Four-way valve fault detection method and device and air conditioner Download PDFInfo
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- CN113280470B CN113280470B CN202110648105.8A CN202110648105A CN113280470B CN 113280470 B CN113280470 B CN 113280470B CN 202110648105 A CN202110648105 A CN 202110648105A CN 113280470 B CN113280470 B CN 113280470B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/38—Failure diagnosis
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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Abstract
The invention provides a four-way valve fault detection method and device and an air conditioner, and relates to the technical field of air conditioners. The four-way valve fault detection method comprises the following steps: acquiring the temperature of an exhaust port compressed before a compressor is started to obtain a first initial temperature; obtaining the temperature of a heat exchanger of an indoor unit or an outdoor unit before the compressor is started to obtain a second initial temperature; after the compressor is started, acquiring the real-time temperature of an exhaust port to obtain the real-time exhaust temperature; selectively acquiring the real-time heat exchange temperature of the heat exchanger according to the real-time exhaust temperature and the first initial temperature; and judging whether the four-way valve of the air conditioner breaks down or not according to the real-time heat exchange temperature and the second initial temperature. The four-way valve fault detection method provided by the invention can automatically identify the four-way valve fault, thereby improving the maintenance convenience.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a four-way valve fault detection method and an air conditioner.
Background
The four-way valve is an important component in an air conditioner, and is generally used for controlling the flow direction of a refrigerant in a system, so that the switching between a cooling mode and a heating mode is realized. In the actual use process, if the four-way valve fails to change direction or the air is mixed, the refrigeration and heating effects are greatly influenced.
Because the cross valve sets up inside the air conditioner, when the cross valve broke down, be difficult to in time discover, the experience sense that the continuous operation air conditioner brought the utmost point for the user.
Disclosure of Invention
The problem solved by the invention is that the failure of the four-way valve is difficult to find in time.
In order to solve the problems, the invention provides a four-way valve fault detection method which can automatically identify the four-way valve fault so as to improve the maintenance convenience.
A four-way valve fault detection method is applied to an air conditioner and comprises the following steps:
acquiring the temperature of an exhaust port of a compressor before the compressor is started to obtain a first initial temperature;
obtaining the temperature of a heat exchanger of an indoor unit or an outdoor unit before the compressor is started to obtain a second initial temperature;
after the compressor is started, acquiring the real-time temperature of the exhaust port to obtain the real-time exhaust temperature;
selectively acquiring the real-time heat exchange temperature of the heat exchanger according to the real-time exhaust temperature and the first initial temperature;
and judging whether a four-way valve of the air conditioner breaks down or not according to the real-time heat exchange temperature and the second initial temperature.
In an optional embodiment, the step of selectively obtaining the real-time heat exchange temperature of the heat exchanger according to the real-time exhaust temperature and the first initial temperature comprises:
comparing the real-time exhaust temperature with a first preset threshold;
if the real-time exhaust temperature is greater than the first preset threshold, comparing the difference value between the real-time exhaust temperature and the first initial temperature with a second preset threshold;
and if the difference value between the real-time exhaust temperature and the first initial temperature is greater than the second preset threshold value, acquiring the real-time heat exchange temperature of the heat exchanger.
In an optional embodiment, the step of determining whether a four-way valve of the air conditioner fails according to the real-time heat exchange temperature and the second initial temperature includes:
calculating the difference value between the real-time heat exchange temperature and the second initial temperature to obtain a heat exchange temperature difference;
comparing the heat exchange temperature difference with a third preset threshold value;
and judging whether a four-way valve of the air conditioner breaks down or not according to a comparison result of the heat exchange temperature difference and the third preset threshold value.
In an optional embodiment, the step of determining whether a four-way valve of the air conditioner fails according to a comparison result between the heat exchange temperature difference and the third preset threshold includes:
if the heat exchange temperature difference is smaller than the third preset threshold value, judging that the four-way valve has a fault;
and if the heat exchange temperature difference is greater than or equal to the third preset threshold value, judging that the four-way valve fails.
In an optional embodiment, after the step of determining that the four-way valve fails if the heat exchange temperature difference is smaller than the third preset threshold, the method further includes:
comparing the heat exchange temperature difference with a fourth preset threshold value, wherein the fourth preset threshold value is smaller than the third preset threshold value;
and judging the fault type of the four-way valve according to the comparison result of the heat exchange temperature difference and the fourth preset threshold value.
In an optional embodiment, the step of determining the fault type of the four-way valve according to the comparison result between the heat exchange temperature difference and the fourth preset threshold includes:
if the heat exchange temperature difference is smaller than the fourth preset threshold value, judging that the four-way valve has a switching fault;
and if the heat exchange temperature difference is greater than or equal to the fourth preset threshold value, judging that the four-way valve has a gas leakage fault.
In an optional embodiment, after the step of determining the fault type of the four-way valve according to the comparison result between the heat exchange temperature difference and the fourth preset threshold, the method further includes:
controlling the compressor to stop for a preset time;
starting with the step of obtaining the temperature of the exhaust port of the compressor before the compressor is started to obtain a first initial temperature, and circulating the subsequent steps;
and if the four-way valve is still judged to have faults of corresponding types after circulating for the preset times, sending fault alarm signals of corresponding fault types.
The embodiment of the invention also provides a four-way valve fault detection device, which is applied to an air conditioner and comprises the following components:
the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring the temperature of an exhaust port of a compressor before the compressor is started to obtain a first initial temperature, acquiring the temperature of a heat exchanger of an indoor unit or an outdoor unit before the compressor is started to obtain a second initial temperature, acquiring the real-time temperature of the exhaust port after the compressor is started to obtain the real-time exhaust temperature, and selectively acquiring the real-time heat exchange temperature of the heat exchanger according to the real-time exhaust temperature and the first initial temperature;
and the judging module is used for judging whether a four-way valve of the air conditioner breaks down or not according to the real-time heat exchange temperature and the second initial temperature.
In an alternative embodiment, the obtaining module includes:
the first comparison sub-module is used for comparing the real-time exhaust temperature with a first preset threshold value and comparing the difference value between the real-time exhaust temperature and the first initial temperature with a second preset threshold value under the condition that the real-time exhaust temperature is greater than the first preset threshold value;
and the obtaining submodule is used for obtaining the real-time heat exchange temperature of the heat exchanger under the condition that the difference value between the real-time exhaust temperature and the first initial temperature is greater than the second preset threshold value.
In an optional embodiment, the determining module includes:
the calculation submodule is used for calculating the difference value between the real-time heat exchange temperature and the second initial temperature to obtain a heat exchange temperature difference;
the second comparison submodule is used for comparing the heat exchange temperature difference with a third preset threshold value;
and the judging submodule is used for judging that the four-way valve fails under the condition that the heat exchange temperature difference is smaller than a third preset threshold value, and is used for judging that the four-way valve fails under the condition that the heat exchange temperature difference is larger than or equal to the third preset threshold value.
The embodiment of the invention also provides an air conditioner, which comprises a controller, wherein the controller is used for executing the four-way valve fault detection method, and the four-way valve fault detection method comprises the following steps:
acquiring the temperature of an exhaust port of a compressor before the compressor is started to obtain a first initial temperature;
obtaining the temperature of a heat exchanger of an indoor unit or an outdoor unit before the compressor is started to obtain a second initial temperature;
after the compressor is started, acquiring the real-time temperature of the exhaust port to obtain the real-time exhaust temperature;
selectively acquiring the real-time heat exchange temperature of the heat exchanger according to the real-time exhaust temperature and the first initial temperature;
and judging whether a four-way valve of the air conditioner breaks down or not according to the real-time heat exchange temperature and the second initial temperature.
Drawings
Fig. 1 is a flow chart of a four-way valve fault detection method according to an embodiment of the present invention;
FIG. 2 is a block flow diagram of the substeps of step S104 of FIG. 1;
FIG. 3 is a block diagram of a flow chart of the substeps of step S105 in FIG. 1;
FIG. 4 is a block flow diagram of a sub-step of substep S1053 of FIG. 3;
fig. 5 is a block diagram of a four-way valve fault detection apparatus according to an embodiment of the present invention;
FIG. 6 is a block diagram of the acquisition module of FIG. 5;
fig. 7 is a block diagram of the determining module in fig. 5.
Description of reference numerals:
100-a four-way valve fault detection device; 110-an obtaining module; 111-a first comparison sub-module; 113-an acquisition submodule; 130-a judgment module; 131-a calculation submodule; 133-a second alignment submodule; 135-decision submodule.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Referring to fig. 1, fig. 1 is a block diagram illustrating a flow chart of a four-way valve fault detection method according to an embodiment of the present disclosure. The four-way valve fault detection method is applied to the air conditioner, and can automatically identify faults of the four-way valve of the air conditioner, so that the maintenance convenience is improved, and the user experience is further improved. The four-way valve fault detection method comprises the following steps:
step S101, acquiring the temperature of the exhaust port of the compressor before the compressor is started, and obtaining a first initial temperature.
In this embodiment, the gas vent position of compressor is provided with temperature sensor, and temperature sensor acquires the temperature of the gas vent of compressor in real time.
Further, the four-way valve fault detection method further comprises the following steps:
step S102, obtaining the temperature of the heat exchanger of the indoor unit or the outdoor unit before the compressor is started, and obtaining a second initial temperature.
It should be noted that, in the four-way valve fault detection method provided in this embodiment, the detection data may be obtained by the heat exchanger of the indoor unit, or may be obtained by the heat exchanger of the outdoor unit.
Further, the four-way valve fault detection method further comprises the following steps:
and step S103, acquiring the real-time temperature of the exhaust port after the compressor is started to obtain the real-time exhaust temperature.
Further, the four-way valve fault detection method further comprises the following steps:
and step S104, selectively acquiring the real-time heat exchange temperature of the heat exchanger according to the real-time exhaust temperature and the first initial temperature.
The compressor is ensured to normally work according to the real-time exhaust temperature and the first initial temperature, a certain pressure difference is achieved, and meanwhile, the problem that the risk of false alarm is caused when the compressor is started directly due to the fact that the exhaust temperature is not lowered timely or the environment temperature is too high during starting is avoided. Therefore, other factors affecting the determination result are excluded by step S104.
Referring to fig. 2, fig. 2 shows a sub-step flow chart of step S104, and step S104 may include:
and a substep S1041 of comparing the real-time exhaust temperature with a first preset threshold value.
In fact, the first preset threshold value is set differently according to the current operation mode of the air conditioner. If the air conditioner is currently operated in a heating mode, the set range of the first preset threshold is 0-40 ℃, and the first preset threshold is preferably 20 ℃; if the air conditioner is currently operated in the cooling mode, the first preset threshold is set to be in a range of 20 ℃ to 60 ℃, preferably 40 ℃.
In the substep S1042, if the real-time exhaust temperature is greater than the first preset threshold, the difference between the real-time exhaust temperature and the first initial temperature is compared with a second preset threshold.
The second preset threshold is set in the range of 0 ℃ to 30 ℃, preferably 15 ℃.
And in the substep S1043, if the difference value between the real-time exhaust temperature and the first initial temperature is greater than a second preset threshold value, acquiring the real-time heat exchange temperature of the heat exchanger.
If the difference value between the real-time exhaust temperature and the first initial temperature is larger than a second preset threshold value, the compressor is indicated to work normally, and the compressor runs for a period of time, so that the influence of the ambient temperature is exhausted. In this case, the real-time heat exchange temperature of the heat exchanger may be a heat exchanger of an indoor unit or a heat exchanger of an outdoor unit.
With reference to fig. 1, the four-way valve fault detection method further includes:
and S105, judging whether the four-way valve of the air conditioner breaks down or not according to the real-time heat exchange temperature and the second initial temperature.
After the influence of the factors such as the compressor failure and the ambient temperature is discharged in step S104, whether the four-way valve has a failure or not is determined according to the temperature change tendency of the heat exchanger.
Referring to fig. 3, fig. 3 is a block diagram illustrating a sub-step flow of step S105, wherein step S105 may include:
and a substep S1051 of calculating a difference value between the real-time heat exchange temperature and the second initial temperature to obtain a heat exchange temperature difference.
And a substep S1052, comparing the heat exchange temperature difference with a third preset threshold value.
In the case that the detection object is a heat exchanger of an indoor unit, if the air conditioner operates in a heating mode, the heat exchanger of the indoor unit is equivalent to a condenser, and the heat exchange temperature difference is necessarily smaller than the temperature difference of the exhaust temperature of the compressor, so that the third preset threshold and the second preset threshold have a proportional relation, in this embodiment, the third preset threshold is equal to the second preset threshold multiplied by a proportional coefficient of 0.2, and in other embodiments, the proportional coefficient may also select other values within a range of 0 to 1. If the air conditioner operates in a refrigeration mode, the heat exchanger of the indoor unit is equivalent to an evaporator, and at the moment, the heat exchange temperature difference is irrelevant to the exhaust temperature, and in this case, the third preset threshold value is a value within a range of 0 ℃ to 10 ℃, preferably 3 ℃.
In the case where the detection target is a heat exchanger of an outdoor unit, if the air conditioner operates in a heating mode, the outdoor heat exchanger corresponds to an evaporator, and at this time, the heat exchange temperature difference is not related to the discharge temperature, and in this case, the third preset threshold value is set to a value in a range of 0 ℃ to 10 ℃, preferably 3 ℃. If the air conditioner is operated in a cooling mode, the heat exchanger of the outdoor unit is equivalent to a condenser, and similarly, the third preset threshold is equal to the second preset threshold multiplied by the proportionality coefficient of 0.2, and in other embodiments, the proportionality coefficient may also be selected from other values within a range of 0 to 1.
And a substep S1053 of judging whether the four-way valve of the air conditioner breaks down or not according to the comparison result of the heat exchange temperature difference and a third preset threshold value.
Referring to fig. 4, fig. 4 is a block flow diagram of a sub-step of the sub-step S1053, and the sub-step S1053 may include:
and in the substep S1053a, if the heat exchange temperature difference is smaller than a third preset threshold value, determining that the four-way valve has a fault.
And the heat exchange temperature difference is smaller than a third preset threshold value, which indicates that the heat exchange temperature difference is too small, and the four-way valve is judged to be in fault under the condition of eliminating the influence of the compressor and the ambient temperature. If the heat exchange temperature difference is larger than or equal to a third preset threshold value, the characteristic heat exchange temperature difference is normal, and the four-way valve is judged not to break down.
And a substep S1053b of comparing the heat exchange temperature difference with a fourth preset threshold value, wherein the fourth preset threshold value is smaller than the third preset threshold value.
The value of the fourth preset threshold is in the range of-10 ℃ to 0 ℃, and in this embodiment, the value is preferably-2 ℃. On the premise of judging that the four-way valve fails, the specific failure type of the four-way valve is further judged according to the heat exchange temperature difference of the heat exchanger.
And in the substep S1053c, if the heat exchange temperature difference is smaller than a fourth preset threshold value, determining that the four-way valve has a switching fault.
And when the heat exchange temperature difference is smaller than a fourth preset threshold value, the heat exchange quantity is too small, the four-way valve cannot be switched, and the switching fault of the four-way valve is judged.
And in the substep S1053d, if the heat exchange temperature difference is greater than or equal to a fourth preset threshold value, determining that the four-way valve has a gas leakage fault.
And if the heat exchange temperature difference is smaller than a third preset threshold value and is greater than or equal to a fourth preset threshold value, the heat exchange amount is small, the four-way valve is indicated to be connected in series, and the gas connection fault of the four-way valve is judged.
And a sub-step S1053e of controlling the compressor to be stopped for a preset time.
It is understood that the single determination result is not convincing and there may be a detection error. Therefore, after the fault type is determined once, the compressor is controlled to stop for a preset time, and then the round of determination is performed again, wherein the preset time is 3 minutes in the embodiment.
Substep S1053f begins with the step of obtaining the temperature of the discharge of the compressor before the compressor is turned on, obtaining a first initial temperature, and cycling through the subsequent steps.
And a substep S1053g, if the four-way valve is still judged to have faults of corresponding types after circulating for a preset number of times, sending out fault alarm signals of corresponding fault types.
Through the substep S1053f and the substep S1053g, the multiple judgment results show that the four-way valve has the fault of the corresponding type, the type of the fault of the four-way valve is determined, and at the moment, a fault alarm signal corresponding to the fault type is sent out, so that the air conditioner can give a fault alarm to remind a user of corresponding maintenance.
In order to perform the corresponding steps in the above method embodiments and various possible embodiments, an implementation of the four-way valve failure detection apparatus 100 is given below. Referring to fig. 5, fig. 5 is a block diagram illustrating a four-way valve fault detection apparatus 100 according to an embodiment of the present disclosure. The four-way valve fault detection device 100 is applied to an air conditioner, and the four-way valve fault detection device 100 includes an obtaining module 110 and a judging module 130.
The obtaining module 110 is configured to obtain a temperature of an exhaust port of the compressor before the compressor is started, obtain a first initial temperature, obtain a temperature of a heat exchanger of an indoor unit or an outdoor unit before the compressor is started, obtain a second initial temperature, obtain a real-time temperature of the exhaust port after the compressor is started, obtain a real-time exhaust temperature, and selectively obtain a real-time heat exchange temperature of the heat exchanger according to the real-time exhaust temperature and the first initial temperature. The obtaining module 110 is used for executing steps S101 to S104 of the four-way valve fault detection method.
And the judging module 130 is configured to judge whether a four-way valve of the air conditioner fails according to the real-time heat exchange temperature and the second initial temperature. The determining module 130 is configured to execute step S105 of the four-way fault detecting method.
Referring to fig. 6, fig. 6 is a block diagram illustrating a structure of the obtaining module 110, where the obtaining module 110 includes a first comparing sub-module 111 and a obtaining sub-module 113.
The first comparison submodule 111 is configured to compare the real-time exhaust temperature with a first preset threshold, and compare a difference between the real-time exhaust temperature and the first initial temperature with a second preset threshold when the real-time exhaust temperature is greater than the first preset threshold. The first comparison module is used for executing the foregoing substeps 1041 and substep S1042.
The obtaining submodule 113 is configured to obtain a real-time heat exchange temperature of the heat exchanger when a difference between the real-time exhaust temperature and the first initial temperature is greater than a second preset threshold. The obtaining sub-module 113 is configured to perform sub-step S1043 of the four-way fault detection method.
Referring to fig. 7, fig. 7 is a block diagram illustrating a structure of the determining module 130, wherein the determining module 130 includes a calculating sub-module 131, a second comparing sub-module 133 and a determining sub-module 135.
And the calculating submodule 131 is used for calculating a difference value between the real-time heat exchange temperature and the second initial temperature to obtain a heat exchange temperature difference. The computation submodule 131 is configured to perform the substep S1051 of the four-way fault detection method described above.
And the second comparison submodule 133 is configured to compare the heat exchange temperature difference with a third preset threshold. The second comparison submodule 133 is configured to perform the substep S1052 of the four-way fault detection method.
And the judgment submodule 135 is configured to judge that the four-way valve fails when the heat exchange temperature difference is smaller than a third preset threshold value, and judge that the four-way valve fails when the heat exchange temperature difference is greater than or equal to the third preset threshold value. The determination submodule 135 is used for executing the sub-step S1053, the sub-step S1053a to the sub-step S1053g of the four-way fault detection method.
The embodiment of the present application further provides an air conditioner, which includes a controller, wherein the controller is configured to execute the four-way valve fault detection method of the foregoing step S101 to step S105, and the controller is further configured to execute a plurality of sub-steps corresponding to the plurality of steps of the four-way valve fault detection method respectively.
In summary, the four-way valve fault detection method, the four-way valve fault detection apparatus 100 and the air conditioner provided in this embodiment eliminate the interference of the compressor, the ambient temperature and the like through the temperature difference of the exhaust temperature, and then determine whether the four-way valve has a fault through the heat exchange temperature difference of the heat exchanger, and further determine the type of the fault. The automatic fault identification of the four-way valve of the air conditioner is realized, the maintenance convenience of the air conditioner is improved, and the user experience is further improved.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (7)
1. A four-way valve fault detection method is applied to an air conditioner and is characterized by comprising the following steps:
acquiring the temperature of an exhaust port of a compressor before the compressor is started to obtain a first initial temperature;
obtaining the temperature of a heat exchanger of an indoor unit or an outdoor unit before the compressor is started to obtain a second initial temperature;
after the compressor is started, acquiring the real-time temperature of the exhaust port to obtain the real-time exhaust temperature;
acquiring the real-time heat exchange temperature of the heat exchanger according to the real-time exhaust temperature and the first initial temperature;
judging whether a four-way valve of the air conditioner breaks down or not according to the real-time heat exchange temperature and the second initial temperature;
the step of obtaining the real-time heat exchange temperature of the heat exchanger according to the real-time exhaust temperature and the first initial temperature comprises the following steps:
comparing the real-time exhaust temperature with a first preset threshold;
if the real-time exhaust temperature is greater than the first preset threshold, comparing the difference value between the real-time exhaust temperature and the first initial temperature with a second preset threshold;
if the difference value between the real-time exhaust temperature and the first initial temperature is larger than the second preset threshold value, acquiring the real-time heat exchange temperature of the heat exchanger;
the step of judging whether a four-way valve of the air conditioner breaks down according to the real-time heat exchange temperature and the second initial temperature comprises the following steps:
calculating the difference value between the real-time heat exchange temperature and the second initial temperature to obtain a heat exchange temperature difference;
comparing the heat exchange temperature difference with a third preset threshold value;
and judging whether a four-way valve of the air conditioner breaks down or not according to a comparison result of the heat exchange temperature difference and the third preset threshold value.
2. The method for detecting the four-way valve fault according to claim 1, wherein the step of judging whether the four-way valve of the air conditioner has the fault according to the comparison result of the heat exchange temperature difference and the third preset threshold comprises the following steps of:
if the heat exchange temperature difference is smaller than the third preset threshold value, judging that the four-way valve breaks down;
and if the heat exchange temperature difference is greater than or equal to the third preset threshold value, judging that the four-way valve fails.
3. The four-way valve fault detection method according to claim 1, wherein after the step of determining that the four-way valve is faulty if the heat exchange temperature difference is smaller than the third preset threshold, the method further comprises:
comparing the heat exchange temperature difference with a fourth preset threshold value, wherein the fourth preset threshold value is smaller than the third preset threshold value;
and judging the fault type of the four-way valve according to the comparison result of the heat exchange temperature difference and the fourth preset threshold value.
4. The four-way valve fault detection method according to claim 3, wherein the step of determining the fault type of the four-way valve according to the comparison result between the heat exchange temperature difference and the fourth preset threshold value comprises:
if the heat exchange temperature difference is smaller than the fourth preset threshold value, judging that the four-way valve has a switching fault; and if the heat exchange temperature difference is greater than or equal to the fourth preset threshold value, judging that the four-way valve has a gas leakage fault.
5. The four-way valve fault detection method according to claim 3, wherein after the step of determining the fault type of the four-way valve according to the comparison result between the heat exchange temperature difference and the fourth preset threshold, the method further comprises:
controlling the compressor to stop for a preset time;
starting with the step of obtaining the temperature of the exhaust port of the compressor before the compressor is started to obtain a first initial temperature, and circulating the subsequent steps;
and if the four-way valve is still judged to have faults of corresponding types after circulating for the preset times, sending fault alarm signals of corresponding fault types.
6. The utility model provides a cross valve fault detection device, is applied to the air conditioner, its characterized in that includes: the system comprises an acquisition module (110), a control module and a control module, wherein the acquisition module is used for acquiring the temperature of an exhaust port of a compressor before the compressor is started to obtain a first initial temperature, acquiring the temperature of a heat exchanger of an indoor unit or an outdoor unit before the compressor is started to obtain a second initial temperature, acquiring the real-time temperature of the exhaust port after the compressor is started to obtain the real-time exhaust temperature, and acquiring the real-time heat exchange temperature of the heat exchanger according to the real-time exhaust temperature and the first initial temperature;
the judging module (130) is used for judging whether a four-way valve of the air conditioner breaks down or not according to the real-time heat exchange temperature and the second initial temperature;
the acquisition module (110) comprises:
the first comparison sub-module (111) is used for comparing the real-time exhaust temperature with a first preset threshold value, and comparing the difference value between the real-time exhaust temperature and the first initial temperature with a second preset threshold value under the condition that the real-time exhaust temperature is greater than the first preset threshold value;
the obtaining submodule (113) is used for obtaining the real-time heat exchange temperature of the heat exchanger under the condition that the difference value between the real-time exhaust temperature and the first initial temperature is larger than the second preset threshold value;
the determining means (130) comprises:
the calculation submodule (131) is used for calculating the difference value between the real-time heat exchange temperature and the second initial temperature to obtain a heat exchange temperature difference;
the second comparison submodule (133) is used for comparing the heat exchange temperature difference with a third preset threshold value;
and the judging submodule (135) is used for judging that the four-way valve fails under the condition that the heat exchange temperature difference is smaller than a third preset threshold value, and is used for judging that the four-way valve fails under the condition that the heat exchange temperature difference is larger than or equal to the third preset threshold value.
7. An air conditioner comprising a controller for performing the four-way valve malfunction detection method according to any one of claims 1 to 5.
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| JP2000274896A (en) * | 1999-03-24 | 2000-10-06 | Tokyo Gas Co Ltd | Method for sensing abnormality of expansion valve and air conditioner |
| CN106352489A (en) * | 2016-09-29 | 2017-01-25 | 广东志高暖通设备股份有限公司 | Air conditioner fault detecting method and system |
| CN107270600A (en) * | 2017-06-07 | 2017-10-20 | 珠海格力电器股份有限公司 | Method and device for detecting reversing abnormality of four-way valve and heat pump unit |
| JP2018123991A (en) * | 2017-01-31 | 2018-08-09 | 株式会社富士通ゼネラル | Air conditioner |
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| JP2000274896A (en) * | 1999-03-24 | 2000-10-06 | Tokyo Gas Co Ltd | Method for sensing abnormality of expansion valve and air conditioner |
| CN106352489A (en) * | 2016-09-29 | 2017-01-25 | 广东志高暖通设备股份有限公司 | Air conditioner fault detecting method and system |
| JP2018123991A (en) * | 2017-01-31 | 2018-08-09 | 株式会社富士通ゼネラル | Air conditioner |
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