CN110553344A - Multi-split air conditioner and fault determination method of indoor unit thereof - Google Patents
Multi-split air conditioner and fault determination method of indoor unit thereof Download PDFInfo
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- CN110553344A CN110553344A CN201910848688.1A CN201910848688A CN110553344A CN 110553344 A CN110553344 A CN 110553344A CN 201910848688 A CN201910848688 A CN 201910848688A CN 110553344 A CN110553344 A CN 110553344A
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- indoor unit
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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
Abstract
The invention discloses a multi-split air conditioner and a fault judgment method of an indoor unit of the multi-split air conditioner. The method for judging the fault of the multi-online indoor unit comprises the following steps: acquiring the periodic change rate of the comprehensive temperature of the indoor unit; judging the relation between the periodic change rate of the comprehensive temperature and a corresponding preset value according to the running state of the indoor unit; and judging whether the indoor unit has a fault according to the relation. The method can accurately judge the faults of the indoor units of the multi-split air conditioner, and locate the fault points, thereby being convenient for solving the problems in time after sale.
Description
Technical Field
The invention relates to a multi-split air conditioner, in particular to a fault determination method of an indoor unit of the multi-split air conditioner.
Background
The multi-split air conditioner is an air conditioning system with a plurality of indoor units, wherein one outdoor unit (or a plurality of outdoor units) of the air conditioner is connected in parallel. When a throttling component (usually, an electronic expansion valve, hereinafter, the electronic expansion valve is taken as an example) of an indoor unit fails, the failure refers to that the electronic expansion valve cannot be normally controlled, a valve body is stuck or the opening degree cannot be adjusted, and may be caused by damage of a control coil of the electronic expansion valve or blockage of the valve body by impurities (welding slag, copper scraps or system oil decomposition substances left in production and manufacturing) in an air conditioning system and the like.
If the failure of the electronic expansion valve is in a stuck fully closed state, the indoor unit may not be able to perform cooling or heating. If the failure of the electronic expansion valve is in a stuck full-open state, the refrigerant flows through the indoor unit when the indoor unit is in a refrigeration shutdown state, and the refrigerant directly returns to the low-pressure side without heat exchange, so that other indoor units (in a startup state) have poor refrigeration effect and low energy efficiency, liquid flow noise is generated, and the risk of damaging a compressor due to too much accumulated liquid refrigerant on the low-pressure side exists. If the fault of the electronic expansion valve is in a blocked and non-adjustable state of not being fully opened or fully closed, the indoor unit is abnormal in refrigerating or heating operation, the power consumption is abnormally increased or the indoor unit cannot normally operate under protection.
therefore, how to accurately determine the failure of the indoor unit is an urgent technical problem to be solved in the industry.
Disclosure of Invention
In order to solve the technical problem that the fault of the indoor unit cannot be accurately judged in the prior art, the multi-split air conditioner and the fault judgment method of the indoor unit are provided.
The invention provides a fault judgment method of an indoor unit of a multi-connected machine, which comprises the following steps:
Acquiring the periodic change rate of the comprehensive temperature of the indoor unit;
Judging the relation between the periodic change rate of the comprehensive temperature and a corresponding preset value according to the running state of the indoor unit;
And judging whether the indoor unit has a fault according to the relation.
Specifically, the comprehensive temperature of the indoor unit is calculated by a formula f (x) = T 1 × a + T 2 × b + T 3 × c + (T 2 -T 1) × d + (T 3 -T 2) × e, where T 1 is an indoor unit inlet pipe temperature, T 2 is an indoor unit outlet pipe temperature, T 3 is an indoor unit ambient temperature, a is an indoor unit inlet pipe temperature correction coefficient, b is an indoor unit outlet pipe temperature correction coefficient, c is an indoor unit ambient temperature correction coefficient, d is an indoor unit pipeline temperature difference correction coefficient, and e is an indoor unit shutdown temperature correction coefficient.
specifically, the periodic variation rate K of the integrated temperature is calculated by a formula (f (n+1) -f (n))/f (n), where f (n+1) is the integrated temperature counted in the current period, and f (n) is the integrated temperature counted in the previous period of the current period.
Specifically, when the multi-split air conditioner is in a refrigeration mode and the indoor unit is started, if the periodic change rate is greater than a preset maximum value within a certain time, it is determined that the throttling element of the indoor unit is in a blocking and fully-closed state.
specifically, when the multi-split air conditioner is in a refrigeration mode and the indoor unit is started, if the periodic change rate is greater than a preset value and smaller than a preset maximum value within a certain time, it is determined that the throttling component of the indoor unit is stuck at a certain opening degree value A, wherein A is not equal to 0 and A is not equal to the maximum opening degree.
Specifically, when the multi-split air conditioner is in an air supply mode and the indoor unit is started, if the periodic change rate is smaller than a preset minimum value within a certain time, it is determined that the throttling component of the indoor unit is in a stuck and fully opened state or a certain opening value A, wherein A is not equal to 0.
specifically, when the multi-split air conditioner is in a cooling mode or an air supply mode and the indoor unit is turned off, if the periodic change rate is greater than a preset maximum value within a certain time, it is determined that the throttling component of the indoor unit is in a stuck full-open state or a certain opening value A, and A is not equal to 0.
Specifically, when the multi-split air conditioner is in a heating mode and the indoor unit is started, if the periodic change rate is smaller than a preset value and larger than a minimum preset value within a certain time, it is determined that the throttling component of the indoor unit is stuck at a certain opening degree value a, where a is not equal to 0 and a is not equal to a maximum opening degree.
Specifically, when the multi-split air conditioner is in a heating mode and the indoor unit is started, if the periodic change rate is smaller than the minimum preset value within a certain time, it is determined that the throttling element of the indoor unit is in a blocked and fully closed state.
Specifically, when the multi-split air conditioner is in a heating mode and the indoor unit is turned off, if the periodic change rate is greater than the maximum preset value within a certain time, it is determined that the throttling element of the indoor unit is in a fully-open stuck state or stuck at a certain opening value a, where a is not equal to 0.
Preferably, the throttling component comprises an electronic expansion valve.
The multi-split air conditioner provided by the invention adopts the fault judgment method in the technical scheme to automatically judge the fault.
according to the invention, the comprehensive temperature of the multi-split air conditioner is calculated by utilizing the system operation parameters of the multi-split air conditioner, the operation state of each indoor unit is evaluated in an all-around manner, and then the change rate in a period of time is calculated according to the comprehensive temperature, so that whether the operation of throttling components such as an electronic expansion valve of the indoor unit is normal or not can be accurately judged, compared with the problem that the system cannot accurately judge or cannot timely judge the fault of the throttling components such as the electronic expansion valve, the operation of the unit can be better protected.
Drawings
the invention is described in detail below with reference to examples and figures, in which:
Fig. 1 is a flowchart of a fault determination method of the present invention.
Detailed Description
The principles and embodiments of the present invention are described in detail below with reference to the accompanying drawings.
As shown in fig. 1, the method for determining a fault of a multi-connected indoor unit of the present invention mainly determines a periodic variation rate of a total temperature of the indoor unit, where the total temperature is calculated by formula f (x) = T 1 × a + T 2 × b + T 3 × c + (T 2 -T 1) × d + (T 3 -T 2) × e, where T 1 is an indoor unit inlet pipe temperature, T 2 is an indoor unit outlet pipe temperature, T 3 is an indoor unit ambient temperature, a is an indoor unit inlet pipe temperature correction coefficient, b is an outlet pipe indoor unit temperature correction coefficient, c is an indoor unit ambient temperature correction coefficient, d is an indoor unit pipe temperature difference correction coefficient, e is an indoor unit shutdown temperature correction coefficient, where a, b, c, d, and e are constants, and are different values in different indoor unit operating states, and then a periodic variation rate K of the total temperature of the indoor unit is calculated by formula (f (n+1) -f (n))/f 6, where f (n+1) is a current period calculated by subtracting a statistical period of the total temperature of the first total temperature, which is calculated for example, N is a total temperature calculated by a total temperature of the first time N (n), and N is calculated by formula N1.
And then the multi-split air conditioner judges the relation between the periodic change rate of the comprehensive temperature and the corresponding preset value according to the running state of each indoor unit, and judges whether each indoor unit has a fault according to the relation. The multi-split air conditioner generally has a cooling mode, a heating mode and an air supply mode. For a single indoor unit, the indoor unit has two states of power-on and power-off in the operation mode of the multi-split air conditioner, and the determination mode in each mode and state (collectively referred to as the operation state of the indoor unit) is different.
When the multi-split air conditioner is in a refrigeration mode, when an indoor unit is started, the shutdown temperature correction coefficient e of the indoor unit is 0, the comprehensive temperature f (x) = T 1 × a + T 2 × b + T 3 × c + (T 2 -T 1) × d, if the periodic change rate of the comprehensive temperature within a certain time is greater than a preset maximum value, the throttling component of the indoor unit is judged to be in a blocked fully-closed state, the multi-split air conditioner can display a corresponding fault code, the indoor unit does not have refrigeration capacity at the time, if the indoor unit is started alone, the multi-split air conditioner system is likely to have high-voltage protection or low-voltage protection, and therefore the whole air conditioner is required to be shut down and protected, namely the multi-split air conditioner is shut down.
When the multi-split air conditioner is in an air supply mode, when an indoor unit is started, the shutdown temperature correction coefficient e of the indoor unit is 0, the comprehensive temperature f (x) = T 1 × a + T 2 × b + T 3 × c + (T 2 -T 1) × d, if the periodic change rate of the comprehensive temperature within a certain time is smaller than a preset minimum value, the throttle component of the indoor unit is judged to be in a stuck and fully opened state or a certain opening value A, A is not equal to 0, namely the throttle component is not stuck and is in a fully closed state, the refrigerant of the indoor unit leaks, the multi-split air conditioner can display a corresponding fault code, and at the moment, the multi-split air conditioner has certain air supply capacity in the indoor unit mode, but the compressor is possibly damaged, and therefore the whole machine needs to be shut down.
When the multi-split air conditioner is in a cooling mode or an air supply mode, when the indoor unit is shut down, the correction coefficient a of the inlet pipe temperature of the indoor unit and the correction coefficient b of the outlet pipe temperature of the indoor unit are both 0, the comprehensive temperature f (x) = T 3 × c + (T 2 -T 1) × d + (T 3 -T 2) × e, if the periodic change rate of the comprehensive temperature in a certain time is greater than the preset maximum value, the throttle component of the indoor unit is judged to be in a stuck fully-open state or a certain opening value A, A is not equal to 0, namely the throttle component is not stuck in a fully-closed state.
When the multi-split air conditioner is in a heating mode, when an indoor unit is started, the shutdown temperature correction coefficient e of the indoor unit is 0, the comprehensive temperature f (x) = T 1 × a + T 2 × b + T 3 × c + (T 2 -T 1) × d, if the periodic change rate of the comprehensive temperature in a certain time is smaller than a preset value and larger than a minimum preset value, the throttle component of the indoor unit is determined to be stuck at a certain opening value A, A is not equal to 0 and A is not equal to the maximum opening, the multi-split air conditioner can display a corresponding fault code, only the heating effect of the indoor unit is poor, and no other protection risks exist, so no shutdown protection is needed.
When the multi-split air conditioner is in a heating mode, when the indoor unit is shut down, the correction coefficient b of the outlet pipe temperature of the indoor unit and the correction coefficient c of the ambient temperature of the indoor unit are both 0, the comprehensive temperature f (x) = T 1 xa + (T 2 -T 1). times.d + (T 3 -T 2). times.e, if the periodic change rate of the comprehensive temperature within a certain time is larger than the maximum preset value, the throttle component of the indoor unit is judged to be in a fully-open stuck state or stuck at a certain opening value A, A is not equal to 0.
If the outdoor unit and the indoor unit of the multi-split air conditioner are both in a shutdown state, whether a fault occurs or not is not required to be judged and protection is performed.
The throttle component of the indoor unit in the above technical solution includes, but is not limited to, an electronic expansion valve. Meanwhile, the invention also protects the corresponding multi-split air-conditioner, the multi-split air-conditioner adopts the fault judgment method to automatically judge the fault of the multi-split air-conditioner, and whether the shutdown protection of the whole air-conditioner is needed or not is determined according to the requirement, and the type of the multi-split air-conditioner also comprises but is not limited to a side air outlet type multi-split air-conditioner.
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 (12)
1. A fault judgment method for an indoor unit of a multi-connected machine is characterized by comprising the following steps:
Acquiring the periodic change rate of the comprehensive temperature of the indoor unit;
Judging the relation between the periodic change rate of the comprehensive temperature and a corresponding preset value according to the running state of the indoor unit;
And judging whether the indoor unit has a fault according to the relation.
2. The method for determining a failure in an indoor unit of a multi-connected unit as claimed in claim 1, wherein the integrated temperature of the indoor unit is calculated by the formula f (x) = T 1 × a + T 2 × b + T 3 × c + (T 2 -T 1) × d + (T 3 -T 2) × e, where T 1 is an indoor unit inlet pipe temperature, T 2 is an indoor unit outlet pipe temperature, T 3 is an indoor unit ambient temperature, a is an indoor unit inlet pipe temperature correction coefficient, b is an indoor unit outlet pipe temperature correction coefficient, c is an indoor unit ambient temperature correction coefficient, d is an indoor unit pipe temperature difference correction coefficient, and e is an indoor unit shutdown temperature correction coefficient.
3. The method for determining a malfunction of an indoor unit of a multi-online machine according to claim 2, wherein the periodic rate of change K of the integrated temperature is calculated by a formula (f (n+1) -f (n))/f (n), wherein f (n+1) is the integrated temperature counted in a current period, and f (n) is the integrated temperature counted in a previous period of the current period.
4. The method for determining the fault of the multi-online indoor unit according to claim 3, wherein when the multi-online unit is in a cooling mode and the indoor unit is started, if the periodic change rate is greater than a preset maximum value within a certain time, it is determined that a throttling element of the indoor unit is in a stuck and fully closed state.
5. The method for determining the fault of the multi-online indoor unit according to claim 3, wherein when the multi-online unit is in a cooling mode and the indoor unit is started up, if the periodic change rate is greater than a preset value and less than a preset maximum value within a certain time, it is determined that a throttle component of the indoor unit is stuck at a certain opening degree value A, wherein A is not equal to 0 and A is not equal to the maximum opening degree.
6. The method for determining the fault of the multi-online indoor unit according to claim 3, wherein when the multi-online unit is in an air supply mode and the indoor unit is started, if the periodic change rate is smaller than a preset minimum value within a certain time, it is determined that a throttling component of the indoor unit is in a stuck and fully opened state or is dead at a certain opening value A, where A is not equal to 0.
7. the method for determining the fault of the multi-online indoor unit according to claim 3, wherein when the multi-online unit is in a cooling mode or a blowing mode and the indoor unit is turned off, if the periodic change rate is greater than a preset maximum value within a certain time, it is determined that a throttling component of the indoor unit is in a stuck fully-open state or a certain opening value A, where A is not equal to 0.
8. The method for determining the fault of the multi-online indoor unit according to claim 3, wherein when the multi-online unit is in a heating mode and the indoor unit is powered on, if the periodic change rate is smaller than a preset value and larger than a minimum preset value within a certain time, it is determined that a throttle component of the indoor unit is stuck at a certain opening value A, wherein A is not equal to 0 and A is not equal to a maximum opening.
9. The method for determining the fault of the multi-online indoor unit according to claim 3, wherein when the multi-online unit is in a heating mode and the indoor unit is started, if the periodic change rate is smaller than a minimum preset value within a certain time, it is determined that a throttling element of the indoor unit is in a stuck and fully closed state.
10. The method for determining the fault of the multi-online indoor unit according to claim 3, wherein when the multi-online unit is in a heating mode and the indoor unit is turned off, if the periodic change rate is greater than a maximum preset value within a certain time, it is determined that a throttling component of the indoor unit is in a fully-open stuck state or stuck at a certain opening value A, where A is not equal to 0.
11. The method for determining the failure of an indoor unit of a multi-split air conditioner according to any one of claims 1 to 10, wherein the throttling component comprises an electronic expansion valve.
12. A multi-split air conditioner characterized in that a failure is automatically determined by the failure determination method according to any one of claims 1 to 11.
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| CN201910848688.1A CN110553344B (en) | 2019-09-09 | 2019-09-09 | Multi-split air conditioner and throttling component fault determination method of indoor unit of multi-split air conditioner |
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| CN201910848688.1A CN110553344B (en) | 2019-09-09 | 2019-09-09 | Multi-split air conditioner and throttling component fault determination method of indoor unit of multi-split air conditioner |
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