CN113639398B - Protection method of refrigeration system during abnormal exhaust detection of compressor and air conditioning unit - Google Patents

Protection method of refrigeration system during abnormal exhaust detection of compressor and air conditioning unit Download PDF

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CN113639398B
CN113639398B CN202110898430.XA CN202110898430A CN113639398B CN 113639398 B CN113639398 B CN 113639398B CN 202110898430 A CN202110898430 A CN 202110898430A CN 113639398 B CN113639398 B CN 113639398B
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compressor
exhaust temperature
temperature
theoretical
detected
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CN113639398A (en
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林海荣
齐方成
李金奎
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Zhuhai Hengqin Energy Development Co ltd
Gree Electric Appliances Inc of Zhuhai
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Zhuhai Hengqin Energy Development Co ltd
Gree Electric Appliances Inc of Zhuhai
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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
    • 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
    • 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
    • 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
    • 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
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • 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
    • 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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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Thermal Sciences (AREA)
  • Air Conditioning Control Device (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

The invention discloses a method for protecting a refrigerating system when the exhaust detection of a compressor is abnormal and an air conditioning unit1And theoretical exhaust temperature t2The current constant entropy index k of the refrigerant in the set is corrected according to the size of the refrigerant’When the exhaust temperature of the compressor is detected abnormally, the constant entropy index k is corrected for the last time according to the compressor’Judging whether the refrigerating system is shut down for protection or not according to the theoretical exhaust temperature value, and when the theoretical exhaust temperature value of the compressor exceeds the preset temperature tIs provided withAnd when the temperature is over, the refrigerating system is stopped for protection. This application can break down and lead to exhaust temperature to detect when unusual at refrigerating system's exhaust temperature sensing package, replaces actual exhaust temperature by theoretical exhaust temperature temporarily and compares and judge to make refrigerating system can continue to operate, need not shutdown protection.

Description

Protection method of refrigeration system during abnormal exhaust detection of compressor and air conditioning unit
Technical Field
The invention relates to the technical field of air conditioners, in particular to a protection method of a refrigerating system when exhaust of a compressor is detected to be abnormal and an air conditioning unit.
Background
The compressor is a core component of the refrigerating system and is also a place which is easy to cause problems in the whole refrigerating system, and the existing unit has a plurality of logics related to the protection of the compressor, so that the damage of the unit caused by the operation of the compressor under abnormal working conditions is avoided; when the exhaust temperature of the compressor is too high, high-temperature protection can be started by a refrigeration system, so that a unit stops running; however, in the prior art, once a fault of the exhaust temperature bulb is detected, the exhaust detection of the compressor is abnormal, and in order to prevent the compressor from being abnormal, the unit is stopped by alarming until the fault is removed, and although the processing mode can prevent the compressor from having a larger problem, the unit is also stopped unnecessarily, so that the usability of the unit is reduced.
Disclosure of Invention
The invention provides a protection method of a refrigeration system when the exhaust detection of a compressor is abnormal and an air conditioning unit, which solve the defect of shutdown protection when the exhaust detection of the compressor is abnormal in the prior art.
The technical scheme adopted by the invention is as follows: a method for protecting a refrigeration system in the event of compressor discharge detection anomaly, comprising the steps of: and when the exhaust temperature of the compressor is detected abnormally, judging whether the refrigeration system is shut down for protection according to the theoretical exhaust temperature value of the compressor.
Further, according to the formula:
Figure DEST_PATH_IMAGE002
calculating the theoretical discharge temperature of the compressor, t2Is the theoretical discharge temperature of the compressor, said t3The temperature of the compressor is the suction temperature of the unit, P1 is the low pressure of the unit, P2 is the high pressure of the unit, and k is the constant entropy index of the refrigerant in the unit when the exhaust temperature of the compressor is detected to be abnormal.
Further, when the exhaust temperature of the compressor is detected normally, the actual exhaust temperature T of the compressor is detected at preset time intervals T1And according to the actual exhaust temperature t1And theoretical exhaust temperature t2The current constant entropy index k of the refrigerant in the set is corrected according to the size of the refrigerant’。
Further, when the theoretical exhaust temperature t2Actual exhaust temperature t ≦1At a predetermined deviation Δ t, k’Increasing Δ k1, said Δ k1= (t)2- t1+△t）/10。
Further, when the theoretical exhaust temperature t2Not less than the actual exhaust gas temperature t1When k is’Reducing Δ k2, said Δ k2= (t)2- t1）/10。
Further, when the actual exhaust temperature t is1-predetermined deviation Δ t < theoretical exhaust temperature t2< actual exhaust temperature t1When k is’And is not changed.
Further, characterized in that the preset deviation Δ t =3 ℃.
Further, when the compressor exhaust temperature detection is abnormal, the constant entropy index k is the constant entropy index k which is corrected for the last time before the compressor exhaust temperature detection is abnormal’。
Further, when the theoretical exhaust temperature value of the compressor exceeds the preset temperature tIs provided withAnd when the temperature is over, the refrigerating system is stopped for protection.
An air conditioning unit comprises the protection method of the refrigeration system.
This application judges refrigerating system's exhaust temperature according to the theoretical exhaust temperature of compressor and whether satisfies the condition of shutdown protection, when theoretical exhaust temperature who reachs reaches the shutdown protection condition when calculating, refrigerating system opens high temperature shutdown protection mode this moment, protection system's safety, make when refrigerating system's exhaust temperature sensing package breaks down and leads to exhaust temperature to detect unusually through such mode, replace actual exhaust temperature by theoretical exhaust temperature temporarily and compare and judge, thereby make refrigerating system can continue to operate, need not shutdown protection.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the embodiments or the prior art description 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 for those skilled in the art, other drawings may be obtained according to these drawings without inventive labor.
Fig. 1 is a control flow diagram of a protection method of a refrigeration system according to the present invention.
Detailed Description
The principles and construction of the present invention will be described in detail below with reference to the drawings and examples.
The application provides a method for protecting a refrigeration system when the exhaust gas detection of a compressor is abnormal, which is mainly applied to a high-temperature protection method for the refrigeration system under the condition that the exhaust gas detection of the compressor is abnormal when the exhaust gas temperature sensing bulb of the compressor of the refrigeration system is in fault.
The calculation formula of the theoretical exhaust temperature when the exhaust temperature of the compressor is detected abnormally is as follows:
Figure DEST_PATH_IMAGE004
，t2is the theoretical discharge temperature of the compressor, t3The method comprises the following steps of (1) taking the suction temperature of a unit, P1 taking the low-pressure of the unit, P2 taking the high-pressure of the unit, and k taking the constant entropy index of a refrigerant in the unit when the exhaust temperature of a compressor is detected to be abnormal; suction temperature t of the unit3The low pressure P1 of the unit and the high pressure P2 of the unit are detection values.
As shown in fig. 1, in the present application, when the discharge detection of the compressor is normal, the actual discharge temperature T of the compressor is detected once every preset time T (in this embodiment, 5s is removed, and the user can adjust the size of the compressor according to the actual situation)1And according to the actual exhaust temperature t1And theoretical exhaust temperature t2The current constant entropy index k of the refrigerant in the unit is corrected in real time according to the size of the refrigerant’Thereby ensuringEnsuring constant entropy index k once exhaust detection of compressor is abnormal’Can be corrected to the most accurate value, and the final calibrated constant entropy index k obtained before the compressor discharge detection abnormality’The theoretical exhaust temperature when the compressor exhausts abnormally is calculated as the constant entropy index k when the exhaust temperature is detected abnormally.
Wherein, the constant entropy index k when the exhaust temperature of the compressor is detected normally’The correction process of (2) comprises: comparing the detected actual discharge temperature t of the compressor1And theoretical exhaust temperature t2Current constant entropy index k of refrigerant in size correction unit’。
It should be noted that the constant entropy index k’The value of (a) is determined by the working medium, for example: the constant entropy coefficient of ideal air is usually 1.4; however, the actual compression process of the compressor is not a constant entropy process, the compressor has friction in the compression process and can transfer heat to the outside, the compressor can age to different degrees and the refrigerant oil can be carbonized along with the increase of the service time of a unit, and therefore, the constant entropy index k’Will vary and cannot take on a fixed value.
Current constant entropy index k of refrigerant’The specific correction process of (2) is as follows: when theoretical exhaust temperature t2Actual exhaust temperature t ≦1A predetermined deviation Δ t, when k’Increase Δ k1, Δ k1= (t)2- t1+. DELTA t)/10, such that the theoretical exhaust temperature t1Enlarging; when the theoretical exhaust temperature t2Not less than the actual exhaust gas temperature t1When k is’Reducing Δ k2, said Δ k2= (t)2- t1) 10; when the actual exhaust temperature t1-predetermined deviation Δ t < theoretical exhaust temperature t2< actual exhaust temperature t1When k is’And is not changed.
Wherein the predetermined deviation Δ t =3 ℃, i.e. maintaining the actual exhaust gas temperature t1And theoretical exhaust temperature t2The difference value of the delta t can be within 3 ℃, the value of the delta t can be set according to the requirements of customers, and if the high temperature of the users protects the preset temperature tIs provided withLower, it can be adjusted to be larger, if the high temperature protects the preset temperature TIs provided withHigher, the lower can be adjusted properly.
When the exhaust temperature sensing bulb of the compressor fails to cause the exhaust temperature detection to be abnormal, the constant entropy index k of the last calibration obtained before the exhaust temperature detection of the compressor is abnormal is used for calibrating the constant entropy index k’Calculating the theoretical exhaust temperature of the compressor when the exhaust temperature is abnormal as the constant entropy index k when the exhaust temperature is detected to be abnormal, and when the theoretical exhaust temperature value of the compressor exceeds the preset temperature tIs provided withAt this time, the refrigeration system is shut down for protection.
Further, the application also provides an air conditioning unit which comprises the protection method of the refrigeration system.
The above specific embodiments are only intended to illustrate the inventive concept and many modifications and variations may be made by those skilled in the art within the spirit of the invention, which are included within the scope of the invention.

Claims (4)

1. A method for protecting a refrigeration system in the event of compressor discharge detection anomaly, comprising the steps of: when the exhaust temperature of the compressor is detected to be abnormal, judging whether the refrigerating system is shut down for protection or not according to the theoretical exhaust temperature value of the compressor;
according to the formula:
Figure DEST_PATH_IMAGE001
calculating a theoretical discharge temperature of the compressor, t2Is the theoretical discharge temperature of the compressor, t3The temperature of the suction gas of the unit is P1, the pressure of the low pressure of the unit is P2, the pressure of the high pressure of the unit is K, and the constant entropy index of the refrigerant in the unit when the exhaust temperature of the compressor is detected to be abnormal;
when the exhaust temperature of the compressor is detected normally, the actual exhaust temperature T of the compressor is detected at preset time intervals T1And according to the actual exhaust temperature t1And theoretical exhaust temperature t2The current constant entropy index k of the refrigerant in the set is corrected according to the size of the refrigerant’；
When theoretical exhaust temperature t2Actual exhaust temperature t ≦1-a predetermined deviation Δ t, k’Increasing Δ k1, said Δ k1= (t)2- t1+△t）/10；
When theoretical exhaust temperature t2Not less than the actual exhaust gas temperature t1When k is’Reducing Δ k2, said Δ k2= (t)2- t1）/10；
When the actual exhaust temperature t1-predetermined deviation Δ t < theoretical exhaust temperature t2< actual exhaust temperature t1When k is’The change is not changed;
when the exhaust temperature of the compressor is detected to be abnormal, the constant entropy index k is the constant entropy index k which is corrected for the last time before the exhaust temperature of the compressor is detected to be abnormal’。
2. Protection method for a refrigeration system, according to claim 1, characterized in that said preset deviation Δ t =3 ℃.
3. Method for protecting a refrigeration system according to claim 1, characterized in that when the theoretical discharge temperature value of the compressor exceeds a preset temperature tIs provided withAnd when the temperature is over, the refrigerating system is stopped for protection.
4. An air conditioning unit characterized by comprising a method of protecting a refrigeration system according to any one of claims 1 to 3.
CN202110898430.XA 2021-08-05 2021-08-05 Protection method of refrigeration system during abnormal exhaust detection of compressor and air conditioning unit Active CN113639398B (en)

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SE9502101L (en) * 1995-06-08 1996-12-09 Curt Daevermo ventilation systems
CN102889641A (en) * 2012-09-12 2013-01-23 青岛海信日立空调系统有限公司 Air conditioner used in high-temperature environment and control method
CN106529021B (en) * 2016-11-09 2019-07-26 东南大学 A kind of air-conditioning system simulation method based on feature identification
CN108758970B (en) * 2018-06-15 2020-05-12 珠海格力电器股份有限公司 Abnormal state detection method of exhaust temperature sensing bulb and compressor protection method
CN110895024B (en) * 2018-09-12 2021-08-27 奥克斯空调股份有限公司 Refrigerant leakage detection method and air conditioner
CN110895017B (en) * 2019-12-09 2021-03-05 宁波奥克斯电气股份有限公司 Protection method for air conditioner lack of refrigerant and air conditioner
CN112393377A (en) * 2020-11-16 2021-02-23 珠海格力电器股份有限公司 Fault judgment method and air conditioner
CN112629020B (en) * 2020-12-17 2023-04-14 青岛海尔新能源电器有限公司 Heat pump water heater and control method thereof
CN112648710B (en) * 2020-12-21 2022-10-28 广东美的暖通设备有限公司 Exhaust temperature sensor fault detection method and device and air conditioning equipment

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