CN110553344B - Multi-split air conditioner and throttling component fault determination method of indoor unit of multi-split air conditioner - Google Patents
Multi-split air conditioner and throttling component fault determination method of indoor unit of multi-split air conditioner Download PDFInfo
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- CN110553344B CN110553344B CN201910848688.1A CN201910848688A CN110553344B CN 110553344 B CN110553344 B CN 110553344B CN 201910848688 A CN201910848688 A CN 201910848688A CN 110553344 B CN110553344 B CN 110553344B
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000000737 periodic effect Effects 0.000 claims abstract description 31
- 238000010438 heat treatment Methods 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 6
- 238000005057 refrigeration Methods 0.000 description 6
- 239000003507 refrigerant Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000004378 air conditioning Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000010729 system oil Substances 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
- 238000003466 welding Methods 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
- F24F11/62—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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- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a multi-split air conditioner and a method for judging the fault of a throttling component 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 method for judging the fault of the throttling component of the indoor unit are provided.
The invention provides a method for judging the fault of a throttling component 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 represented by a formula f（x）=T1×a+T2×b+T3×c+(T2-T1) ×d+(T3-T2) × e, where T is calculated1For the inlet pipe temperature, T, of the indoor unit2For the outlet pipe temperature, T, of the indoor unit3The temperature of the indoor unit is set as the ambient temperature of the indoor unit, 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 rate of change K of the integrated temperature is represented by the formula (f)（n+1）- f（n））/ f（n）Is calculated to obtain, wherein f（n+1）Integrated temperature, f, counted for the current cycle（n）The integrated temperature counted for the previous cycle of the current cycle.
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 fully-open state or stuck at 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 fully-open state or stuck at 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.
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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 failure of a throttling component of a multi-online indoor unit mainly determines the failure by a periodic change rate of a comprehensive temperature of the indoor unit. The integrated temperature is mainly expressed by the formula f（x）=T1×a+T2×b+T3×c+(T2-T1) ×d+(T3-T2) × e, where T is calculated1For the inlet pipe temperature, T, of the indoor unit2For the outlet pipe temperature, T, of the indoor unit3The temperature of the indoor unit is set as the ambient temperature of the indoor unit, 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. Wherein a, b, c, d and e are constants, and the values are different under different indoor unit operation states. The periodic rate of change K of the integrated temperature of the indoor unit is then determined by the formula (f)（n+1）- f（n））/ f（n）Is calculated to obtain, wherein f（n+1）Integrated temperature, f, counted for the current cycle（n）The integrated temperature counted for the previous cycle of the current cycle. I.e. subtracting the previously calculated integrated temperature from the subsequently calculated integrated temperature, e.g. the first calculated integrated temperature is f（1）The second calculated integrated temperature is f（2）The third calculated integrated temperature is f（3）The Nth calculation is f（n）The integrated temperature of the N +1 th calculation is f（n+1）In one embodiment, the duration of each cycle is within 1 minute.
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 and the indoor unit is started at the moment, the shutdown temperature correction coefficient e of the indoor unit is 0, and the comprehensive temperature f（x）=T1×a+T2×b+T3×c+(T2-T1) ×dIf the periodic change rate of the comprehensive temperature within a certain time is greater than the preset maximum value, the throttle component of the indoor unit is judged to be in a blocked full-closed state, the multi-split air conditioner can display a corresponding fault code, the indoor unit does not have refrigerating capacity at the moment, and if the indoor unit is singly opened, the multi-split air conditioner system is possibly subjected to high-voltage protection or low-voltage protection, so that the whole air conditioner is required to be shut down for protection, namely the multi-split air conditioner is shut down. If the periodic change rate of the comprehensive temperature within a certain time is larger than a preset value and smaller than a preset maximum value, the throttle component of the indoor unit is judged to be stuck at a certain opening value A, A is not equal to 0 and A is not equal to the maximum opening, namely the throttle component is not stuck at a full-open state or stuck at a full-closed state, the multi-split air conditioner can display a corresponding fault code, only the refrigerating effect of the indoor unit is poor or the liquid return risk of the system exists at the moment, if the indoor unit system is singly opened, the compressor is possibly damaged, and therefore the shutdown protection of the whole air conditioner is further needed.
When the multi-split air conditioner is in an air supply mode and the indoor unit is started at the moment, the shutdown temperature correction coefficient e of the indoor unit is 0, and the comprehensive temperature f（x）=T1×a+T2×b+T3×c+(T2-T1) × d, if the periodic variation rate of the integrated temperature in a certain time is less than the preset minimum value, judging that the throttling component of the indoor unit is in a stuck full-open state or a certain opening value A, A is not equal to 0, namely the throttling component is not stuck in a full-close state, the refrigerant of the indoor unit leaks, the multi-split air conditioner can display a corresponding fault code, and the multi-split air conditioner has certain refrigerating capacity in an air supply mode of the indoor unit but can damage the compressor, so the whole machine needs to be shut down for protection.
When the multi-split air conditioner is in a refrigeration mode or an air supply mode, and the indoor unit is shut down, the indoor unit inlet pipe temperature correction coefficient a and the indoor unit outlet pipe temperature correction coefficient b are both 0, and the comprehensive temperature f（x）= T3×c+(T2-T1) ×d+(T3-T2) × e, if the periodic variation rate of the integrated temperature in a certain time is larger than the preset maximum value, determining that the throttling component of the indoor unit is in a stuck and full-open state or a certain opening value A, wherein A is not equal to 0, that is, the throttling component is not stuckDead in the fully closed state. At this moment, the refrigerant of the indoor unit leaks, the multi-split air conditioner can display a corresponding fault code, and the compressor can be damaged, so that the whole air conditioner needs to be shut down and protected.
When the multi-split air conditioner is in a heating mode and the indoor unit is started, the shutdown temperature correction coefficient e of the indoor unit is 0, and the comprehensive temperature f（x）=T1×a+T2×b+T3×c+(T2-T1) × d, if the periodic change rate of the integrated temperature in a certain time is less than the preset value and greater than the minimum preset value, it is determined that the throttling component of the indoor unit is 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 the corresponding fault code, and at this time, the heating effect of the indoor unit is poor, and there is no risk of other protection.
When the multi-split air conditioner is in a heating mode and the indoor unit is shut down, the outlet pipe temperature correction coefficient b and the indoor unit environment temperature correction coefficient c of the indoor unit are both 0, and the comprehensive temperature f（x）= T1×a+(T2-T1) ×d+(T3-T2) × e, if the periodic variation rate of the integrated temperature in 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 and stuck state or stuck in 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 (11)
1. A method for judging the fault of a throttling component of 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; the comprehensive temperature of the indoor unit is represented by the formula f（x）=T1×a+T2×b+T3×c+(T2-T1) ×d+(T3-T2) × e, where T is calculated1For the inlet pipe temperature, T, of the indoor unit2For the outlet pipe temperature, T, of the indoor unit3The temperature of the indoor unit is set as 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;
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 fault in a throttling component of a multi-online indoor unit according to claim 1, wherein the periodic rate of change K of the integrated temperature is represented by a formula (f)（n+1）- f（n））/ f（n）Is calculated to obtain, wherein f（n+1）Is as followsIntegrated temperature, f, counted during the preceding cycle（n）The integrated temperature counted for the previous cycle of the current cycle.
3. The method for determining the fault of the throttling element of the multi-online indoor unit as claimed in claim 2, 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 the throttling element of the indoor unit is in a stuck fully closed state.
4. The method for determining the fault of the throttling component of the multi-online indoor unit as claimed in claim 2, wherein when the multi-online unit is in a cooling mode and the indoor unit is powered on, 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 the throttling component of the indoor unit is stuck at a certain opening degree value a, a is not equal to 0 and a is not equal to the maximum opening degree.
5. The method for determining the fault of the throttling component of the multi-split indoor unit as claimed in claim 2, wherein when the multi-split indoor 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 the throttling component of the indoor unit is in a stuck fully-opened state or stuck at a certain opening value A, where A is not equal to 0.
6. The method for determining the fault of the throttling component of the multi-online indoor unit as claimed in claim 2, wherein when the multi-online unit 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 fully-open state or stuck at a certain opening value a, where a is not equal to 0.
7. The method for determining the fault of the throttling component of the multi-online indoor unit as claimed in claim 2, 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 the throttling component of the indoor unit is stuck at a certain opening value a, a is not equal to 0 and a is not equal to a maximum opening.
8. The method for determining the fault of the throttling element of the multi-online indoor unit as claimed in claim 2, wherein when the multi-online unit is in a heating mode and the indoor unit is started up, if the periodic change rate is smaller than a minimum preset value within a certain time, it is determined that the throttling element of the indoor unit is in a stuck fully closed state.
9. The method for determining the fault of the throttling component of the multi-online indoor unit as claimed in claim 2, 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 the 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.
10. The method for determining the fault of the throttling component of the multi-online indoor unit according to any one of claims 1 to 9, wherein the throttling component comprises an electronic expansion valve.
11. A multi-split air conditioner, characterized in that the method for determining the fault of the throttling component as claimed in any one of claims 1 to 10 is used for automatically determining the fault of the throttling component.
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| JP3933599B2 (en) * | 2003-04-07 | 2007-06-20 | 東邦瓦斯株式会社 | GHP failure prediction diagnosis method and apparatus |
| CN102506490B (en) * | 2011-11-09 | 2013-12-04 | 宁波奥克斯电气有限公司 | Control method for electronic expansion valve of indoor unit during refrigeration of inverter multi-split air conditioner |
| CN107152751B (en) * | 2017-04-21 | 2019-10-25 | 广东美的暖通设备有限公司 | Electric expansion valve fault detection method, air-conditioning and computer readable storage medium |
| CN107575996A (en) * | 2017-09-14 | 2018-01-12 | 深圳达实智能股份有限公司 | Hospital's air conditioner in machine room unit self checking method and device |
| US10809707B2 (en) * | 2018-02-22 | 2020-10-20 | Schneider Electric USA, Inc. | Detection of efficiency degradation in HVAC and R systems |
| CN109297136B (en) * | 2018-11-14 | 2021-02-02 | 宁波奥克斯电气股份有限公司 | Expansion valve blockage judging method and air conditioner |
| CN109855281B (en) * | 2018-12-12 | 2021-05-28 | 青岛海信日立空调***有限公司 | Air conditioner heat exchange device and air conditioner |
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