CN114183883A - Detection method of four-way valve and air conditioner - Google Patents
Detection method of four-way valve and air conditioner Download PDFInfo
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- CN114183883A CN114183883A CN202111501269.4A CN202111501269A CN114183883A CN 114183883 A CN114183883 A CN 114183883A CN 202111501269 A CN202111501269 A CN 202111501269A CN 114183883 A CN114183883 A CN 114183883A
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- 238000001514 detection method Methods 0.000 title claims abstract description 23
- 230000002159 abnormal effect Effects 0.000 claims abstract description 57
- 238000000034 method Methods 0.000 claims abstract description 18
- 230000007613 environmental effect Effects 0.000 claims abstract description 7
- 230000005856 abnormality Effects 0.000 claims abstract description 6
- 238000004378 air conditioning Methods 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 238000010257 thawing Methods 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 239000003507 refrigerant Substances 0.000 abstract description 6
- 230000008859 change Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/52—Indication arrangements, e.g. displays
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a detection method of a four-way valve and an air conditioner, comprising the following steps: acquiring a parameter difference value capable of judging the reversing abnormality of the four-way valve at different environmental temperatures in advance as a parameter difference value threshold; and detecting the current environment temperature to obtain a corresponding parameter difference threshold, and comparing the current parameter difference with the parameter difference threshold corresponding to the current environment temperature to judge whether the four-way valve is abnormal or not when the four-way valve is in state detection. According to the four-way valve abnormal judgment method, the environment temperature condition is increased before judgment, namely the corresponding difference value is determined at different environment temperatures, and the difference value corresponding to the environment temperature is obtained to judge when the four-way valve is abnormal, so that the accuracy of four-way valve judgment can be increased, and abnormal problems can be detected in time. After the four-way valve is detected to be abnormally reversed, the four-way valve is stopped for multiple times and then is started with increased frequency, the flow of a refrigerant is increased, the pressure difference is quickly established, and the reliable reversing of the four-way valve is ensured.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a four-way valve detection method and an air conditioner.
Background
After the prior art scheme detects that the four-way valve is switched, judging conditions are preset through three conditions: the temperature difference between the refrigerant liquid pipe and the defrosting bulb, the temperature difference between the inlet and the outlet water and the change value in the indoor temperature cycle are used for judging whether the four-way valve is abnormal in reversing. However, in the scheme, the temperature difference of each parameter under different environmental temperatures is not distinguished in the detection process, and the temperature difference value in the scheme is a constant value, so that even if the four-way valve is successfully reversed at a lower environmental temperature, the detected temperature difference meets the judgment condition due to the lower environmental temperature and the small refrigerant flow, and false alarm occurs.
Disclosure of Invention
The invention provides a detection method of a four-way valve and an air conditioner, aiming at solving the technical problem that the detection of the four-way valve in the prior art cannot be changed according to the ambient temperature.
The technical scheme adopted by the invention is as follows:
the invention provides a detection method of a four-way valve, which comprises the following steps:
acquiring a parameter difference value capable of judging the reversing abnormality of the four-way valve at different environmental temperatures in advance as a parameter difference value threshold;
and detecting the current environment temperature to obtain a corresponding parameter difference threshold, and comparing the current parameter difference with the parameter difference threshold corresponding to the current environment temperature to judge whether the four-way valve is abnormal or not when the four-way valve is in state detection.
The parameter differences include: the first temperature difference value that the temperature of outlet water was got is subtracted to the temperature of intaking, calculates the second temperature difference value that reachs through high-pressure temperature and low pressure temperature, and the third temperature difference value that obtains through defrosting temperature and liquid pipe temperature calculation, the fourth temperature difference value that the temperature of intaking got is subtracted to the temperature of outlet water, the parameter difference threshold value includes: and the first parameter difference threshold, the second parameter difference threshold, the third parameter difference threshold and the fourth parameter difference threshold are sequentially corresponding.
And starting a heating mode of the air conditioning unit to operate, controlling the four-way valve to be electrified after the compressor is started for a first preset time, and detecting the state of the four-way valve after the compressor is started for a second preset time. When the state of the four-way valve is detected in the state, the step of comparing the current parameter difference value with the parameter difference value threshold value corresponding to the current environment temperature to judge whether the four-way valve is abnormal comprises the following steps:
after waiting for a third preset time, judging whether the current first temperature difference value is greater than a corresponding first parameter difference value threshold value, if so, judging that the four-way valve is abnormal; if not, returning to the judging step or executing the next step;
after waiting for a fourth preset time, judging whether the current second temperature difference value is greater than a corresponding second parameter difference value threshold value, if so, judging that the four-way valve is abnormal; if not, returning to the judging step or executing the next step;
after waiting for a fifth preset time, judging whether the current third temperature difference value is greater than a corresponding third parameter difference value threshold value, if so, judging that the four-way valve is abnormal; if not, returning to the judging step.
And when the air conditioner unit enters a defrosting mode, detecting the state of the four-way valve when the four-way valve is powered off. When the state of the four-way valve is detected in the state, the step of comparing the current parameter difference value with the parameter difference value threshold value determined by the current environment temperature to judge whether the four-way valve is abnormal comprises the following steps:
after waiting for a third preset time, judging whether the current fourth temperature difference value is greater than a corresponding fourth parameter difference value threshold value, if so, judging that the four-way valve is abnormal; if not, returning to the judging step or executing the next step;
after waiting for a fourth preset time, judging whether the current second temperature difference value is greater than a corresponding second parameter difference value threshold value, if so, judging that the four-way valve is abnormal; if not, returning to the judging step.
And when the air conditioning unit exits the defrosting mode, carrying out state detection on the four-way valve when the four-way valve is powered on. When the state of the four-way valve is detected in the state, the step of comparing the current parameter difference value with the parameter difference value threshold value corresponding to the current environment temperature to judge whether the four-way valve is abnormal comprises the following steps:
after waiting for a third preset time, judging whether the current first temperature difference value is greater than a corresponding first parameter difference value threshold value, if so, judging that the four-way valve is abnormal; if not, returning to the judging step or executing the next step;
after waiting for a fourth preset time, judging whether the current second temperature difference value is greater than a corresponding second parameter difference value threshold value, if so, judging that the four-way valve is abnormal; if not, returning to the judging step or executing the next step;
after waiting for a fifth preset time, judging whether the current third temperature difference value is greater than a corresponding third parameter difference value threshold value, if so, judging that the four-way valve is abnormal; if not, returning to the judging step.
Further, when the four-way valve is judged to be abnormal, the air conditioning unit is controlled to stop, then the air conditioning unit is restarted and started, the frequency of the compressor is adjusted to be the preset reversing frequency of the four-way valve, if the four-way valve is not successfully reversed, the air conditioning unit is stopped and restarted, and the frequency of the compressor is gradually increased along with the increase of the times of starting and stopping; and stopping the machine until the four-way valve is successfully reversed, and returning to the step of judging whether the four-way valve is abnormal or not. And when the four-way valve is not successfully reversed after the air conditioning unit reaches the preset starting times, reporting a fault and stopping the air conditioning unit.
The invention also provides an air conditioner, and whether the four-way valve is abnormal is judged by using the detection method of the four-way valve.
Compared with the prior art, the method and the device have the advantages that the environment temperature condition is increased before the judgment, namely the corresponding difference value is determined at different environment temperatures, and the difference value corresponding to the environment temperature is obtained to judge when the four-way valve is judged to be abnormal, so that the judgment accuracy of the four-way valve can be improved, and the abnormal problem can be detected in time.
After the four-way valve is detected to be abnormally reversed, the four-way valve is stopped for multiple times and then is started with increased frequency, the flow of a refrigerant is increased, the pressure difference is quickly established, and the reliable reversing of the four-way valve is ensured.
The four-way valve can not cause gas leakage or unsuccessful reversing and the like under the condition of lower environmental temperature, so that the refrigerating and heating switching is ensured, and the normal operation of the unit is ensured.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a flow chart of detecting a four-way valve in an embodiment of the present invention;
FIG. 2 is a flow chart of controlling a four-way valve according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The principles and construction of the present invention will be described in detail below with reference to the drawings and examples.
The reliable reversing of the four-way valve is related to the refrigerant flow and the ambient temperature of the air conditioning system. The four-way valve may not be reversed or clamped in the middle under the condition of small refrigerant flow or low ambient temperature, so that the reversing is unsuccessful.
As shown in fig. 1, the present invention provides a method for detecting a four-way valve, comprising the steps of:
the method comprises the steps of obtaining parameter difference threshold values capable of judging the reversing abnormality of the four-way valve in advance at different environment temperatures, namely, each environment temperature corresponds to a group of parameter difference threshold values capable of judging the reversing abnormality of the four-way valve (the parameter difference threshold value is the difference value of a series of parameters, at least one parameter is provided, 4 are specifically exemplified in the embodiment of the invention), for example, a group of corresponding parameter difference threshold values can be detected at an interval of 0.1 degree at 20 degrees, a group of corresponding parameter difference threshold values are detected at 20.1 degrees, and the like;
and detecting the current environment temperature to obtain a corresponding parameter difference threshold, and comparing the current parameter difference with the parameter difference threshold corresponding to the current environment temperature to judge whether the four-way valve is abnormal or not when the four-way valve is in state detection. Therefore, the parameter difference threshold value can be automatically changed according to the change of the environment temperature, the comparison of the parameter difference value of the four-way valve is more accurate, and the accuracy of the abnormal judgment of the four-way valve is improved.
The parameter difference value of the four-way valve for state detection comprises: the temperature control method comprises the following steps of calculating a first temperature difference value by subtracting the water outlet temperature Tc from the water inlet temperature Tj, calculating a second temperature difference value by calculating the low-pressure temperature Td and the high-pressure temperature Tg, calculating a third temperature difference value by calculating the defrosting temperature Th and the liquid pipe temperature Ty, and calculating a fourth temperature difference value by subtracting the water inlet temperature Tj from the water outlet temperature Tc, wherein the parameter difference threshold comprises the following steps: the method comprises the steps of sequentially corresponding a first parameter difference threshold value delta T1, a second parameter difference threshold value delta T2, a third parameter difference threshold value delta T3 and a fourth parameter difference threshold value delta T4.
In the control of the air conditioning system, the four-way valve is changed into three stages of entering a heating mode, entering defrosting and exiting defrosting, and the detection conditions are shown in the attached figure 1.
And when the air conditioning unit starts a heating mode to operate, controlling the four-way valve to be electrified after the compressor starts a first preset time, and starting to detect the state of the four-way valve after the compressor starts a second preset time.
The step of comparing the current parameter difference value with the parameter difference value threshold value determined by the current environment temperature to judge whether the four-way valve is abnormal or not comprises the following steps:
after waiting for a third preset time, judging whether the current first temperature difference value is greater than a corresponding first parameter difference value threshold value, if so, judging that the four-way valve is abnormal; if not, returning to the judging step or executing the next step;
after waiting for a fourth preset time, judging whether the current second temperature difference value is greater than a corresponding second parameter difference value threshold value, if so, judging that the four-way valve is abnormal; if not, returning to the judging step or executing the next step;
after waiting for a fifth preset time, judging whether the current third temperature difference value is greater than a corresponding third parameter difference value threshold value, if so, judging that the four-way valve is abnormal; if not, returning to the judging step.
The specific embodiment of the scheme is that when the unit is started to operate in a heating mode, the four-way valve is powered on after the compressor is started for 5S, the state of the four-way valve starts to be detected after the compressor is started for 3min, the actual difference value between the water inlet temperature Tj and the water outlet temperature Tc is detected after 30S, if the actual difference value is larger than delta T1, the reversing is determined to be abnormal, and if the actual difference value is not larger than delta T1, the detection is continued. And after 3min, if the actual difference between the low-pressure temperature Td and the high-pressure temperature Tg is greater than delta T2, determining that the reversing is abnormal, and if the actual difference is not greater than delta T2, continuing to detect. And if the actual difference value between the defrosting temperature Th and the liquid tube temperature Ty is larger than delta T3 in the 6 Th min, judging that the reversing is abnormal, and if the actual difference value is not larger than delta T3, continuing to detect.
When the air conditioner unit enters a defrosting mode, the four-way valve starts to detect the state of the four-way valve after being powered off, and the method specifically comprises the following steps: and respectively acquiring the current fourth temperature difference value and the current second temperature difference value after different preset time, judging whether any one of the current fourth temperature difference value and the current second temperature difference value is larger than a corresponding parameter difference threshold value, and if so, judging that the four-way valve is abnormal.
The specific embodiment of the scheme is that the actual difference between the water temperature Tc and the inlet water temperature Tj is detected after 30S, if the actual difference is larger than delta T4, the reversing abnormality is determined, and if the actual difference is not larger than delta T4, the detection is continued. And after 3min, if the actual difference between the low-pressure temperature Td and the high-pressure temperature Tg is greater than delta T2, determining that the reversing is abnormal, and if the actual difference is not greater than delta T2, continuing to detect.
When the air conditioning unit exits the defrosting mode, the four-way valve is electrified and then the state of the four-way valve is detected, and the method specifically comprises the following steps:
after waiting for a third preset time, judging whether the current first temperature difference value is greater than a corresponding first parameter difference value threshold value, if so, judging that the four-way valve is abnormal; if not, returning to the judging step or executing the next step;
after waiting for a fourth preset time, judging whether the current second temperature difference value is greater than a corresponding second parameter difference value threshold value, if so, judging that the four-way valve is abnormal; if not, returning to the judging step or executing the next step;
after waiting for a fifth preset time, judging whether the current third temperature difference value is greater than a corresponding third parameter difference value threshold value, if so, judging that the four-way valve is abnormal; if not, returning to the judging step.
The specific embodiment of the scheme is that an actual difference value between the inlet water temperature Tj and the outlet water temperature Tc is detected after 30S, if the actual difference value is greater than Δ T1, the detection is determined to be abnormal commutation, and if the actual difference value is not greater than Δ T1, the detection is continued. And after 3min, if the actual difference between the low-pressure temperature Td and the high-pressure temperature Tg is greater than delta T2, determining that the reversing is abnormal, and if the actual difference is not greater than delta T2, continuing to detect. And if the actual difference value between the defrosting temperature Th and the liquid tube temperature Ty is larger than delta T3 in the 6 Th min, judging that the reversing is abnormal, and if the actual difference value is not larger than delta T3, continuing to detect.
The invention also provides a specific control method for the four-way valve when the four-way valve is abnormal, namely when the four-way valve is judged to be abnormal, the air conditioning unit is controlled to stop, then the four-way valve is restarted, the frequency of the compressor is adjusted to be the preset frequency for reversing the four-way valve, if the four-way valve is not successfully reversed, the four-way valve is stopped and restarted, and the frequency of the compressor is gradually increased along with the increase of the times of starting and stopping; and returning to the step of judging whether the four-way valve is abnormal or not until the four-way valve is successfully reversed, or reporting a fault to shut down when the four-way valve is unsuccessfully reversed after the preset startup and shutdown times are reached.
Specifically, as shown in fig. 2, if the four-way valve is abnormally reversed, the compressor is turned off, and the fault is automatically cleared. The first start sends a reversing signal to the compressor according to the reversing frequency of the four-way valve (the reversing frequency preset by the compressor for reversing the four-way valve), the compressor is started, and the machine is stopped again if the abnormal reversing of the four-way valve is continuously reported. The second start raises the commutation frequency by 5Hz, and the machine is stopped again when the commutation is still unsuccessful. And the third starting raises the reversing frequency by 10Hz, if the four-way valve is still reported to be abnormal, the abnormal fault of the four-way valve is reported, the unit is stopped and cannot be started again, and the user is reminded to contact the after-sales maintenance.
The invention also provides an air conditioner, and whether the four-way valve is abnormal is judged by using the detection method of the four-way valve.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A detection method of a four-way valve is characterized by comprising the following steps:
acquiring a parameter difference value capable of judging the reversing abnormality of the four-way valve at different environmental temperatures in advance as a parameter difference value threshold;
and detecting the current environment temperature to obtain a corresponding parameter difference threshold, and comparing the current parameter difference with the parameter difference threshold corresponding to the current environment temperature to judge whether the four-way valve is abnormal or not when the four-way valve is in state detection.
2. The method for detecting a four-way valve according to claim 1, wherein the parameter difference comprises: subtract the first temperature difference value that the outlet water temperature was obtained through the temperature of intaking, calculate the second temperature difference value that reachs through high-pressure temperature and low pressure temperature, calculate the third temperature difference value that reachs through defrosting temperature and liquid pipe temperature, subtract the fourth temperature difference value that the inlet water temperature was obtained through the outlet water temperature, the parameter difference threshold value includes: and the first parameter difference threshold, the second parameter difference threshold, the third parameter difference threshold and the fourth parameter difference threshold are sequentially corresponding.
3. The method for detecting the four-way valve according to claim 2, wherein the air conditioning unit is operated in a heating mode, the four-way valve is controlled to be powered on after a first preset time of starting the compressor, and the step of detecting the state of the four-way valve is performed after a second preset time of starting the compressor.
4. The method for detecting a four-way valve according to claim 2, wherein the step of detecting the state of the four-way valve is performed when the four-way valve is powered off when the air conditioning unit enters a defrosting mode.
5. The method for detecting a four-way valve according to claim 2, wherein the step of detecting the state of the four-way valve is performed when the four-way valve is powered on when the air conditioning unit exits the defrosting mode.
6. The method for detecting a four-way valve according to claim 3 or 5, wherein the step of comparing the current parameter difference value with the parameter difference value threshold corresponding to the current ambient temperature to determine whether the four-way valve is abnormal comprises the steps of:
after waiting for a third preset time, judging whether the current first temperature difference value is greater than a corresponding first parameter difference value threshold value, if so, judging that the four-way valve is abnormal; if not, returning to the judging step or executing the next step;
after waiting for a fourth preset time, judging whether the current second temperature difference value is greater than a corresponding second parameter difference value threshold value, if so, judging that the four-way valve is abnormal; if not, returning to the judging step or executing the next step;
after waiting for a fifth preset time, judging whether the current third temperature difference value is greater than a corresponding third parameter difference value threshold value, if so, judging that the four-way valve is abnormal; if not, returning to the judging step.
7. The method for detecting a four-way valve according to claim 4, wherein the step of comparing the current parameter difference value with a parameter difference value threshold determined by the current ambient temperature to determine whether the four-way valve is abnormal comprises the steps of:
after waiting for a third preset time, judging whether the current fourth temperature difference value is greater than a corresponding fourth parameter difference value threshold value, if so, judging that the four-way valve is abnormal; if not, returning to the judging step or executing the next step;
after waiting for a fourth preset time, judging whether the current second temperature difference value is greater than a corresponding second parameter difference value threshold value, if so, judging that the four-way valve is abnormal; if not, returning to the judging step.
8. The method for detecting the four-way valve according to claim 1, wherein when the four-way valve is judged to be abnormal, the air conditioning unit is controlled to stop, then the four-way valve is restarted, the frequency of the compressor is adjusted to be the preset reversing frequency of the four-way valve, if the four-way valve is not successfully reversed, the four-way valve is stopped and restarted, and the frequency of the compressor is gradually increased along with the increase of the times of starting and stopping; and returning to the step of judging whether the four-way valve is abnormal or not until the four-way valve is successfully reversed.
9. The method for detecting a four-way valve according to claim 8, wherein when the four-way valve is not successfully reversed after the air conditioner set reaches a preset startup number, a fault is reported and the four-way valve is shut down.
10. An air conditioner, characterized in that, the four-way valve detection method of any one of claims 1 to 9 is used to determine whether the four-way valve is abnormal.
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| CN114440408B (en) * | 2021-12-09 | 2023-10-31 | 海信空调有限公司 | Four-way valve control method and device for one-to-many air conditioner and one-to-many air conditioner |
| CN115200194A (en) * | 2022-08-12 | 2022-10-18 | 宁波奥克斯电气股份有限公司 | Control method and device for outdoor unit of multi-split air conditioner, air conditioner and medium |
| CN115200194B (en) * | 2022-08-12 | 2023-08-04 | 宁波奥克斯电气股份有限公司 | Control method and device of outdoor unit of multi-split air conditioner, air conditioner and medium |
| CN117450701A (en) * | 2023-12-20 | 2024-01-26 | 珠海格力电器股份有限公司 | Heat pump unit control method and device, electronic equipment and readable storage medium |
| CN117450701B (en) * | 2023-12-20 | 2024-04-05 | 珠海格力电器股份有限公司 | Heat pump unit control method and device, electronic equipment and readable storage medium |
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