CN115031349B - Control method for overheat safety of multi-connected air conditioner expansion valve fault system - Google Patents
Control method for overheat safety of multi-connected air conditioner expansion valve fault system Download PDFInfo
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- CN115031349B CN115031349B CN202210855398.1A CN202210855398A CN115031349B CN 115031349 B CN115031349 B CN 115031349B CN 202210855398 A CN202210855398 A CN 202210855398A CN 115031349 B CN115031349 B CN 115031349B
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- expansion valve
- superheat degree
- parameter
- air conditioner
- machine
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Classifications
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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
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention provides a control method for safety of superheat degree of a multi-connected air conditioner expansion valve fault system, which relates to the field of air conditioners, and the control method for safety of superheat degree of the multi-connected air conditioner expansion valve fault system, and is characterized in that an inner machine inlet disc temperature, an outer disc temperature and expansion valve opening parameters are detected in a shutdown mode or a startup mode, an inner machine expansion valve is in a runaway state, a special superheat degree control scheme is selected, so that liquid return amount of a compressor is furthest reduced, liquid carrying compression of the compressor is reduced, abrasion is reduced, and the compressor is protected; the alarm shutdown probability is reduced, and the economic loss is reduced; the user is actively reminded of reporting repair, the use of the client is not affected, and the satisfaction of the client is improved.
Description
Technical Field
The application relates to the field of air conditioners, in particular to a control method for overheat safety of a multi-connected air conditioner expansion valve fault system.
Background
The existing multi-connected air conditioner is controlled in such a way that the suction superheat degree is the main, the exhaust superheat degree and the temperature difference between an inlet disc and an outlet disc of an inner machine are auxiliary, and when all the inner machine sensors and the inner machine expansion valve work normally, the system superheat degree can ensure the safe work of the compressor; however, if there is a runaway of the expansion valves of the individual internal machines (abnormal conditions such as failure of the expansion valves of the internal machines, missed control lines of the expansion valves of the internal machines, disconnection of the control lines of the internal machines, etc.), the refrigerant flow of the internal machines is out of control, resulting in an increase of the liquid return amount of the system, and a decrease of the superheat degree of the system.
The alarm shutdown has the following defects: 1. because the superheat degree is not in the safety value range for a period of time before alarming, the liquid return amount of the compressor is increased, the belt pressure of the compressor is contracted, the abrasion is increased, and the compressor is irreversibly damaged; 2. the alarm is stopped, which can affect the use of the user and even can cause economic loss.
Disclosure of Invention
The embodiment of the application aims to provide a control method for safety of overheat of a multi-connected air conditioner expansion valve fault system.
The embodiment of the application provides a control method for safety of overheat of a multi-connected air conditioner expansion valve fault system, which comprises the following steps:
step one, a multi-connected air conditioner operates in a refrigeration mode;
detecting opening parameters of an expansion valve of the inner machine, outlet temperature parameters of the inner machine, inlet temperature parameters of the inner machine and actual exhaust superheat parameters;
step three, calculating and analyzing the detected expansion valve opening parameter, the detected outlet disc temperature parameter, the detected inlet disc temperature parameter and the detected actual exhaust superheat parameter;
step four, if the actual exhaust superheat degree-target exhaust superheat degree) + (inner engine outlet temperature-inner engine inlet temperature) is less than or equal to 0 and less than or equal to 1, the inner engine expansion valve does not act; if (actual exhaust superheat degree-target exhaust superheat degree) + (inner engine outlet temperature-inner engine inlet temperature) < 0, the opening degree of the inner engine expansion valve is reduced; if (actual exhaust superheat degree-target exhaust superheat degree) + (inner engine outlet temperature-inner engine inlet temperature) > 1, increasing the opening of the inner engine expansion valve;
and fifthly, if the internal machine has no capacity requirement, closing the expansion valve of the internal machine.
Preferably, the target exhaust superheat degree in the fourth step may be set according to the power of the multi-connected air conditioner.
Preferably, in the second step, when the opening parameter of the expansion valve, the outlet temperature parameter of the internal machine and the inlet temperature parameter of the internal machine are detected, a shutdown mode or an operation mode can be selected, and one of the two modes can be selected.
Preferably, when the operation mode is set, the control of the degree of superheat of the internal combustion engine is switched from the main control of the degree of superheat of the intake air to the main control of the degree of superheat of the exhaust air, and when the internal combustion engine is out of control, the above-described switching is not performed.
Preferably, in the fourth step, the decrease or increase of the opening degree of the expansion valve of the internal unit may be set to a specific value according to the magnitude of the value of (actual exhaust superheat degree-target exhaust superheat degree) + (internal unit outlet temperature-internal unit inlet temperature).
Preferably, in the second step, the detection time of the expansion valve opening parameter of the inner machine, the outlet temperature parameter of the inner machine, the inlet temperature parameter of the inner machine and the actual exhaust superheat parameter can be set, and the detection time is set to be 1-2 times per week.
Preferably, in the second step, the detection time of the expansion valve opening parameter of the inner machine, the outlet temperature parameter of the inner machine, the inlet temperature parameter of the inner machine and the actual exhaust superheat parameter can be set, and the detection time is set to be 1-2 times of detection per month.
Preferably, when the opening degree of the expansion valve of the internal machine is reduced to 0% or increased by 100%, a fault alarm is started.
The invention has the beneficial effects that:
the invention provides a control method for safety of overheat of a multi-connected air conditioner expansion valve fault system, which comprises the following steps: step one, a multi-connected air conditioner operates in a refrigeration mode; step two, detecting expansion valve opening parameters, inner machine outgoing disc temperature parameters, inner machine incoming disc temperature parameters and actual exhaust superheat parameters of the inner machine; step three, calculating and analyzing the detected expansion valve opening parameter, the detected outlet disc temperature parameter, the detected inlet disc temperature parameter and the detected actual exhaust superheat parameter; step four, if the actual exhaust superheat degree-target exhaust superheat degree) + (inner engine outlet temperature-inner engine inlet temperature) is less than or equal to 0 and less than or equal to 1, the inner engine expansion valve does not act; if (actual exhaust superheat degree-target exhaust superheat degree) + (inner engine outlet temperature-inner engine inlet temperature) < 0, the opening degree of the inner engine expansion valve is reduced; if (actual exhaust superheat degree-target exhaust superheat degree) + (inner engine outlet temperature-inner engine inlet temperature) > 1, increasing the opening of the inner engine expansion valve; step five, if the internal machine has no capacity requirement, closing the expansion valve of the internal machine, and calculating that the expansion valve of the internal machine is in an out-of-control state by detecting the inlet disc temperature, the outlet disc temperature and the expansion valve opening parameter of the internal machine in a shutdown mode or a startup mode, so that a special superheat degree control scheme is selected, the liquid return amount of the compressor is furthest reduced, the liquid carrying compression of the compressor is reduced, the abrasion is reduced, and the compressor is protected; the alarm shutdown probability is reduced, and the economic loss is reduced; the user is actively reminded of reporting repair, the use of the client is not affected, and the satisfaction of the client is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of the present invention.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present application, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships that are conventionally put in use of the product of the application, are merely for convenience of description of the present application and simplification of description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be configured and operated in a specific direction, and therefore should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal," "vertical," "overhang," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
As shown in FIG. 1, the control method for the overheat safety of the multi-connected air conditioner expansion valve fault system comprises the following steps: step one, a multi-connected air conditioner operates in a refrigeration mode; step two, detecting expansion valve opening parameters, inner machine outgoing disc temperature parameters, inner machine incoming disc temperature parameters and actual exhaust superheat parameters of the inner machine; step three, calculating and analyzing the detected expansion valve opening parameter, the detected outlet disc temperature parameter, the detected inlet disc temperature parameter and the detected actual exhaust superheat parameter; step four, if the actual exhaust superheat degree-target exhaust superheat degree) + (inner engine outlet temperature-inner engine inlet temperature) is less than or equal to 0 and less than or equal to 1, the inner engine expansion valve does not act; if (actual exhaust superheat degree-target exhaust superheat degree) + (inner engine outlet temperature-inner engine inlet temperature) < 0, the opening degree of the inner engine expansion valve is reduced; if (actual exhaust superheat degree-target exhaust superheat degree) + (inner engine outlet temperature-inner engine inlet temperature) > 1, increasing the opening of the inner engine expansion valve; step five, if the internal machine has no capacity requirement, closing the expansion valve of the internal machine, and calculating that the expansion valve of the internal machine is in an out-of-control state by detecting the inlet disc temperature, the outlet disc temperature and the expansion valve opening parameter of the internal machine in a shutdown mode or a startup mode, so that a special superheat degree control scheme is selected, the liquid return amount of the compressor is furthest reduced, the liquid carrying compression of the compressor is reduced, the abrasion is reduced, and the compressor is protected; the alarm shutdown probability is reduced, and the economic loss is reduced; the user is actively reminded of reporting repair, the use of the client is not affected, and the satisfaction of the client is improved.
In this embodiment, the target exhaust superheat degree in the fourth step may be set according to the power of the multi-connected air conditioner, and when the power of the multi-connected air conditioner is high, the target exhaust superheat degree may be adjusted to be low, and when the power of the multi-connected air conditioner is low, the target exhaust superheat degree may be adjusted to be high, or may be set according to the usage common, for example, the office area may be adjusted to about 24 degrees celsius, and if the power is turned into the power substation, the power is adjusted to about 18 degrees celsius.
In this embodiment, when the opening parameter of the expansion valve, the outlet temperature parameter of the internal machine, and the inlet temperature parameter of the internal machine are detected, a shutdown mode or an operation mode may be selected, and when the operation mode is selected, the superheat control of the internal machine is switched from the main control of the suction superheat to the main control of the exhaust superheat, and when the internal machine is out of control, the switching is not performed.
In this embodiment, the decrease or increase in the opening degree of the expansion valve of the internal machine may be set to a specific value according to the magnitude of the value of (actual exhaust superheat degree-target exhaust superheat degree) + (internal machine outgoing temperature-internal machine incoming temperature), such as the increase in the opening degree of the expansion valve of the internal machine, and each time the value of (actual exhaust superheat degree-target exhaust superheat degree) + (internal machine outgoing temperature-internal machine incoming temperature) is increased by 0.1, the increase in the opening degree of the expansion valve of the internal machine is 1 percent, such as the decrease in the opening degree of the expansion valve of the internal machine, each time the value of the actual exhaust superheat degree-target exhaust superheat degree) + (internal machine outgoing temperature-internal machine incoming temperature) is decreased by 0.1, the decrease in the opening degree of the expansion valve of the internal machine is 3 percent, specifically, the decrease or increase ratio may be set according to the need.
In this embodiment, the detection time of the expansion valve opening parameter, the outlet temperature parameter, the inlet temperature parameter, and the actual exhaust superheat parameter of the internal machine may be set, and the detection time is set to 1-2 times per week.
In this embodiment, when the opening of the expansion valve of the internal machine is reduced to 0 or increased by 100%, the fault alarm is turned on, and if the opening of the expansion valve of the internal machine is 0 in the multi-connected air conditioner processing air supply mode or the shutdown mode, the alarm is not turned on.
In another embodiment, the detection time of the expansion valve opening parameter, the outlet temperature parameter, the inlet temperature parameter and the actual exhaust superheat parameter of the inner machine can be set, and the detection time is set to be 1-2 times of detection per month.
The foregoing is merely a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and variations may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (8)
1. The control method for the overheat safety of the multi-connected air conditioner expansion valve fault system is characterized by comprising the following steps:
step one, a multi-connected air conditioner operates in a refrigeration mode;
detecting opening parameters of an expansion valve of the inner machine, outlet temperature parameters of the inner machine, inlet temperature parameters of the inner machine and actual exhaust superheat parameters;
step three, calculating and analyzing the detected expansion valve opening parameter, the detected outlet disc temperature parameter, the detected inlet disc temperature parameter and the detected actual exhaust superheat parameter;
step four, if the actual exhaust superheat degree-target exhaust superheat degree) + (inner engine outlet temperature-inner engine inlet temperature) is less than or equal to 0 and less than or equal to 1, the inner engine expansion valve does not act; if (actual exhaust superheat degree-target exhaust superheat degree) + (inner engine outlet temperature-inner engine inlet temperature) < 0, the opening degree of the inner engine expansion valve is reduced; if (actual exhaust superheat degree-target exhaust superheat degree) + (inner engine outlet temperature-inner engine inlet temperature) > 1, increasing the opening of the inner engine expansion valve;
and fifthly, if the internal machine has no capacity requirement, closing the expansion valve of the internal machine.
2. The control method for the safety of the superheat degree of the failure system of the expansion valve of the multi-connected air conditioner according to claim 1 is characterized by comprising the following steps: the target exhaust superheat degree in the fourth step can be set according to the power of the multi-connected air conditioner.
3. The control method for the safety of the superheat degree of the failure system of the expansion valve of the multi-connected air conditioner according to claim 1 is characterized by comprising the following steps: in the second step, when the opening parameter of the expansion valve, the outlet temperature parameter of the internal machine and the inlet temperature parameter of the internal machine are detected, a shutdown mode or an operation mode can be selected, and one of the two modes can be selected.
4. The control method for safety of overheat of a multi-connected air conditioner expansion valve failure system according to claim 3, wherein the control method comprises the following steps: when the operation mode is adopted, the control of the superheat degree of the internal machine is switched from the main control of the suction superheat degree to the main control of the exhaust superheat degree, and when the internal machine is out of control, the switching is not carried out.
5. The control method for the safety of the superheat degree of the failure system of the expansion valve of the multi-connected air conditioner according to claim 1 is characterized by comprising the following steps: in the fourth step, the reduction or increase of the opening of the expansion valve of the internal unit may be set to a specific value according to the value of (actual exhaust superheat-target exhaust superheat) + (internal unit outgoing temperature-internal unit incoming temperature).
6. The control method for the safety of the superheat degree of the failure system of the expansion valve of the multi-connected air conditioner according to claim 1 is characterized by comprising the following steps: in the second step, the detection time of the expansion valve opening parameter, the inner machine outlet temperature parameter, the inner machine inlet temperature parameter and the actual exhaust superheat parameter of the inner machine can be set, and the detection time is set to be 1-2 times of weekly detection.
7. The control method for the safety of the superheat degree of the failure system of the expansion valve of the multi-connected air conditioner according to claim 1 is characterized by comprising the following steps: in the second step, the detection time of the expansion valve opening parameter, the inner machine outlet temperature parameter, the inner machine inlet temperature parameter and the actual exhaust superheat parameter of the inner machine can be set, and the detection time is set to be 1-2 times of detection per month.
8. The control method for the safety of the superheat degree of the failure system of the expansion valve of the multi-connected air conditioner according to claim 1 is characterized by comprising the following steps: when the opening degree of the expansion valve of the internal machine is reduced to 0% or increased by 100%, the fault alarm is started.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210855398.1A CN115031349B (en) | 2022-07-19 | 2022-07-19 | Control method for overheat safety of multi-connected air conditioner expansion valve fault system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210855398.1A CN115031349B (en) | 2022-07-19 | 2022-07-19 | Control method for overheat safety of multi-connected air conditioner expansion valve fault system |
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| CN115031349A CN115031349A (en) | 2022-09-09 |
| CN115031349B true CN115031349B (en) | 2023-07-28 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20060131178A (en) * | 2005-06-15 | 2006-12-20 | 엘지전자 주식회사 | Method to control electric valve of air conditioner |
| JP6320639B2 (en) * | 2015-07-27 | 2018-05-09 | 三菱電機株式会社 | Air conditioner |
| CN108088041B (en) * | 2017-12-06 | 2021-06-22 | 广东美的制冷设备有限公司 | Control method of electronic expansion valve, radiation air conditioner and storage medium |
| CN109855252B (en) * | 2019-02-14 | 2022-02-22 | 青岛海尔空调电子有限公司 | Refrigerant control method of multi-split air conditioning system |
| CN110296518B (en) * | 2019-07-12 | 2020-06-26 | 宁波奥克斯电气股份有限公司 | Control method and device for electronic expansion valve of multi-connected indoor unit and air conditioner |
| CN111023435B (en) * | 2019-12-30 | 2021-09-28 | Tcl空调器(中山)有限公司 | Control method and system for expansion valve of air conditioner and air conditioner |
| CN111023433B (en) * | 2019-12-31 | 2021-10-22 | 宁波奥克斯电气股份有限公司 | Multi-split refrigerant-lack control method and device, storage medium and air conditioning system |
| CN112283903B (en) * | 2020-09-11 | 2022-03-01 | 海信（山东）空调有限公司 | Air conditioner and control method of expansion valve |
| CN113739344B (en) * | 2021-09-23 | 2022-10-28 | 宁波奥克斯电气股份有限公司 | Control method of internal expansion valve, air conditioner and computer readable storage medium |
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