CN110500714B - Air conditioning system and anti-freezing method thereof - Google Patents
Air conditioning system and anti-freezing method thereof Download PDFInfo
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- CN110500714B CN110500714B CN201910642780.2A CN201910642780A CN110500714B CN 110500714 B CN110500714 B CN 110500714B CN 201910642780 A CN201910642780 A CN 201910642780A CN 110500714 B CN110500714 B CN 110500714B
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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
- F24F11/41—Defrosting; Preventing freezing
- F24F11/43—Defrosting; Preventing freezing of indoor units
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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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
- F24F2140/40—Damper positions, e.g. open or closed
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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)
- Human Computer Interaction (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The system respectively detects the outer ring temperature, the inner fan windshield and the outer fan windshield, and respectively divides corresponding detection values into corresponding intervals An, Bn, Cn and Dn. And arranging and combining An, Bn, Cn and Dn to obtain N results, representing each result value by En, and respectively corresponding to a first preset low-voltage value Px, a first preset time value Tm, a second preset low-voltage value Py and a second preset time value Ta which are different correspondingly according to the En value. Through a large number of experiments, the optimal Px, Tm, Py and Ta values are confirmed, so that the condition that the system enters the anti-freezing state and the condition that the system exits the anti-freezing state are confirmed, the good anti-freezing effect can be achieved, and the problem that the system is frostless and frost-melting can be avoided.
Description
Technical Field
The invention relates to an air conditioning system and an anti-freezing method thereof, in particular to an air conditioning system and an anti-freezing method thereof in a refrigeration process.
Background
In the use of air conditioners, cooling mode evaporator frosting is a common problem. Most designers now equip the evaporator with a temperature sensing bulb, use the bulb to collect the evaporator tube temperature, and use the evaporator tube temperature control system to enter or exit the freeze prevention mode. Although the method can also achieve the anti-freezing effect, the method has the following defects: 1) the anti-freezing cost is high by using the anti-freezing temperature sensing bulb; 2) the service life of the anti-freezing temperature sensing bulb is influenced because the anti-freezing temperature sensing bulb works in a cold and hot alternate environment, the temperature sensing bulb is easy to lose efficacy, the detection deviation occurs, and the like, so that the anti-freezing logic of the system is lost. 3) Because the temperature sensing package mounted position can not detect whole evaporimeter, often because detect inaccurate frost ization that leads to the fact to and there is the condition that the frost can not be dissolved in the position that the temperature sensing package can not detect.
Disclosure of Invention
In view of this, the invention provides an anti-freezing method for an air conditioning system, which does not use a defrosting thermal bulb and reduces the production cost. The problem that the reliability of the temperature sensing bulb influences the defrosting of the whole machine is avoided. The invention solves the problem of evaporator frosting and the problem of frostless defrosting of the system in the refrigeration mode. Avoid using spare part defrosting temperature sensing package, reduce manufacturing cost.
Specifically, the method comprises the following steps:
an anti-freezing method of an air conditioning system comprises the following steps:
s01: the air conditioning system starts a refrigeration mode;
s02: after a first preset time n, detecting the outer ring temperature, the inner fan wind shield and the outer fan wind shield;
s03: determining a first preset low-voltage value Px and a first preset time Tm according to the detected outer ring temperature, inner fan gear and outer fan gear;
s04, detecting the first low pressure value Pn of the air conditioning system in real time, and if the following conditions are met: when the duration Tn of Pn ≦ Px is not less than Tm, the air conditioning system enters the antifreeze mode, and when the above condition is not satisfied, the process returns to the initial step of step S04.
Preferably, in step S03, a first preset low voltage value Px is determined according to the detected outer ring temperature, inner fan gear, and outer fan gear, and the first preset time Tm is determined as follows: dividing the detected outer ring temperature, inner fan wind gear and outer fan wind gear into corresponding intervals An, Bn, Cn and Dn; and determining a first preset low-voltage value Px and a first preset time Tm according to the corresponding interval.
Preferably, step S03 further includes: determining a second preset low-voltage value Py and a second preset time Ta according to the detected outer ring temperature, inner fan wind shield and outer fan wind shield;
step S05 is also included after S04: and after the air-conditioning system enters the anti-freezing and cleaning mode, detecting a second low pressure value Pm of the air-conditioning system in real time, and when the time Tp when the Pm is more than or equal to Py is more than or equal to Ta, exiting the anti-freezing mode.
Preferably, the step S05 is followed by a step S06, after the air conditioning system exits the freeze prevention mode, returning to the step S02.
Preferably, in step S03, the manner of determining the second preset low voltage value Py and the second preset time Ta according to the detected outer ring temperature, inner fan gear and outer fan gear is as follows: dividing the detected outer ring temperature, inner fan wind gear and outer fan wind gear into corresponding intervals An, Bn, Cn and Dn; and determining a second preset low-voltage value Py and a second preset time Ta according to the corresponding interval.
Preferably, in step S04, the specific manner for the air conditioning system to enter the anti-freeze mode is as follows: the compressor of the air conditioning system is closed, the outer fan is closed, and the inner fan runs at a low gear.
Preferably, the anti-freezing method is used for preventing freezing of an evaporator of an air conditioning system.
In addition, the invention also provides an air conditioning system which comprises a controller, wherein the controller is used for realizing the anti-freezing method.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The above and other objects, features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings. The drawings described below are merely some embodiments of the present disclosure, and other drawings may be derived from those drawings by those of ordinary skill in the art without inventive effort.
FIG. 1 is a schematic flow diagram illustrating freeze prevention in an air conditioning system according to the present invention.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals denote the same or similar parts in the drawings, and thus, a repetitive description thereof will be omitted.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the subject matter of the present disclosure can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and so forth. In other instances, well-known methods, devices, implementations, or operations have not been shown or described in detail to avoid obscuring aspects of the disclosure.
The block diagrams shown in the figures are functional entities only and do not necessarily correspond to physically separate entities. I.e. these functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor means and/or microcontroller means.
The flow charts shown in the drawings are merely illustrative and do not necessarily include all of the contents and operations/steps, nor do they necessarily have to be performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the actual execution sequence may be changed according to the actual situation.
It will be understood that, although the terms first, second, third, etc. may be used herein to describe various structures, these structures should not be limited by these terms. These terms are used to distinguish one structure from another structure. Thus, a first structure discussed below may be termed a second structure without departing from the teachings of the disclosed concept. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It is to be understood by those skilled in the art that the drawings are merely schematic representations of exemplary embodiments, and that the blocks or processes shown in the drawings are not necessarily required to practice the present disclosure and are, therefore, not intended to limit the scope of the present disclosure.
The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings 1:
an anti-freezing method of an air conditioning system comprises the following steps:
s01: the air conditioning system starts a refrigeration mode;
s02: after a first preset time n, detecting the outer ring temperature, the inner fan wind shield and the outer fan wind shield;
s03: determining a first preset low-voltage value Px and a first preset time Tm according to the detected outer ring temperature, inner fan gear and outer fan gear;
s04, detecting the first low pressure value Pn of the air conditioning system in real time, and if the following conditions are met: when the duration Tn of Pn ≦ Px is not less than Tm, the air conditioning system enters the antifreeze mode, and when the above condition is not satisfied, the process returns to the initial step of step S04.
Preferably, in step S03, a first preset low voltage value Px is determined according to the detected outer ring temperature, inner fan gear, and outer fan gear, and the first preset time Tm is determined as follows: dividing the detected outer ring temperature, inner fan wind gear and outer fan wind gear into corresponding intervals An, Bn, Cn and Dn; and determining a first preset low-voltage value Px and a first preset time Tm according to the corresponding interval.
Preferably, step S03 further includes: determining a second preset low-voltage value Py and a second preset time Ta according to the detected outer ring temperature, inner fan wind shield and outer fan wind shield;
step S05 is also included after S04: and after the air-conditioning system enters the anti-freezing and cleaning mode, detecting a second low pressure value Pm of the air-conditioning system in real time, and when the time Tp when the Pm is more than or equal to Py is more than or equal to Ta, exiting the anti-freezing mode.
Preferably, the step S05 is followed by a step S06, after the air conditioning system exits the freeze prevention mode, returning to the step S02.
Preferably, in step S03, the manner of determining the second preset low voltage value Py and the second preset time Ta according to the detected outer ring temperature, inner fan gear and outer fan gear is as follows: dividing the detected outer ring temperature, inner fan wind gear and outer fan wind gear into corresponding intervals An, Bn, Cn and Dn; and determining a second preset low-voltage value Py and a second preset time Ta according to the corresponding interval.
Preferably, in step S04, the specific manner for the air conditioning system to enter the anti-freeze mode is as follows: the compressor of the air conditioning system is closed, the outer fan is closed, and the inner fan runs at a low gear.
Preferably, the anti-freezing method is used for preventing freezing of an evaporator of an air conditioning system.
In addition, the invention also provides an air conditioning system which comprises a controller, wherein the controller is used for realizing the anti-freezing method.
The principles and processes of the present invention are described below with reference to FIG. 1:
the air conditioning system starts a refrigeration mode, and after the first preset time n, the first preset time n can be set according to specific conditions as long as the air conditioning system stably runs, for example, the time can be set to be more than 5 minutes or other time. And respectively detecting the temperature of an outer ring, the temperature of an inner ring, the wind gear of an inner fan and the wind gear of an outer fan, wherein the temperature of the inner ring is the indoor temperature, the temperature of the outer ring is the outdoor temperature, the inner fan is the fan of an indoor unit, and the outer fan is the fan of an outdoor unit. The corresponding detection values are divided into corresponding intervals An, Bn, Cn, Dn, respectively.
During the test, An, Bn, Cn and Dn are subjected to permutation and combination (different permutation and combination conditions for starting frosting and defrosting are different) to obtain N results, En is used for representing each result value, and according to the En value, a first preset low-pressure value Px, a first preset time value Tm, a second preset low-pressure value Py and a second preset time value Ta which are different correspondingly are respectively corresponding. For example, An can be divided into more than 2 sections, Bn can be divided into more than 2 sections, Cn and Dn can be divided into two sections of low-grade and high-grade, and certainly can be divided into more sections. The low pressure value refers to suction pressure or evaporation pressure, and can be measured at an outdoor unit air valve. After a large number of experiments, the optimal values of Px, Tm, Py and Ta are confirmed, namely the air conditioning system runs in different parameter intervals, the conditions for entering anti-freezing of the system are confirmed through experiments, for example, in one En condition, the experiments show that when the time Tn of the air conditioning system Pn which is less than or equal to Px is more than or equal to Tm, frosting is easy to occur, namely the Px and Tm can determine the optimal value of the conditions for entering anti-freezing under the conditions; similarly, when the time Tp is more than or equal to Ta, the defrosting is considered to be finished under the condition that the low pressure value Pm of the system is more than or equal to Py. At this point Py, Ta may be the figure of merit for conditions to exit from freeze prevention.
Specifically, the method comprises the following steps: when the system runs in the refrigeration mode, the detection of the outer ring temperature, the inner fan wind gear and the outer fan wind gear is carried out for the first n minutes after the refrigeration mode is started by the shielding system. And detecting the outer ring temperature, the inner fan wind gear and the outer fan wind gear after a first preset time n, and dividing corresponding detection values into corresponding intervals An, Bn, Cn and Dn respectively. And arranging and combining An, Bn, Cn and Dn to obtain N results, representing each result value by En, and respectively corresponding to different values of Px, Tm, Py and Ta according to the En value. The values of Px, Tm, Py and Ta can be determined experimentally, and specifically determined according to the defrosting effect during the test.
(1) Judging whether the system enters an anti-freezing mode:
and judging that the system enters anti-freezing, the compressor is closed, the outer fan is closed, and the inner fan runs at a low gear when the time Tn when the low-pressure value Pn of the system is less than or equal to Px is more than or equal to Tm. When the system begins to frost, the frost of the system covers the surface of the evaporator, so that poor heat dissipation of the evaporator is caused, the surface temperature of the evaporator is gradually reduced, the evaporation pressure is gradually reduced, and when the time Tn when Pn is less than or equal to Px is greater than or equal to Tm, the frost of the evaporator is already reached to a certain degree, so that the system judges that the system enters anti-freezing according to conditions. When the time Tn of the low voltage value Pn of the system is not more than or equal to Tm, the system runs normal logic.
(2) Judging that the system exits the anti-freezing mode:
and after the system operates in the anti-freezing mode, when the time Tp of the low pressure value Pm of the system is more than or equal to Py and more than or equal to Ta, the system is started. And (4) exiting the anti-freezing mode, gradually increasing the low pressure value of the system after the system enters the anti-freezing mode, indicating that the defrosting degree of the system reaches the anti-freezing exiting condition of the system when the time Tp of Pm being more than or equal to Py is more than or equal to Ta, and continuing operating the anti-freezing mode until the time Tp of Pm being more than or equal to Py is not more than or equal to Ta until the exiting condition is reached.
After the system operates in the anti-freezing mode, when the time Tp of the low pressure value Pm of the system being more than or equal to Py is not more than or equal to Ta, the system continues to operate in the anti-freezing mode. And (4) the system can return to the detection step again to continue running after quitting until the quitting condition is met.
According to the invention, the optimal Px, Tm, Py and Ta values are confirmed after a large number of experiments according to the logic, so that a better anti-freezing effect can be achieved, and the problem of frost-free and defrosting of the system is avoided.
Exemplary embodiments of the present disclosure are specifically illustrated and described above. It is to be understood that the present disclosure is not limited to the precise arrangements, instrumentalities, or instrumentalities described herein; on the contrary, the disclosure is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (7)
1. An anti-freezing method of an air conditioning system is characterized in that: the method comprises the following steps:
s01: the air conditioning system starts a refrigeration mode;
s02: after a first preset time n, detecting the outer ring temperature, the inner fan wind shield and the outer fan wind shield;
s03: determining a first preset low-voltage value Px and a first preset time Tm according to the detected outer ring temperature, inner fan gear and outer fan gear;
s04, detecting the first low pressure value Pn of the air conditioning system in real time, and if the following conditions are met: when the duration Tn of Pn is more than or equal to Px is more than or equal to Tm, the air conditioning system enters an anti-freezing mode, and when the conditions are not met, the method returns to the initial step of the step S04;
in step S03, a first preset low voltage value Px is determined according to the detected outer ring temperature, inner fan gear, and outer fan gear, and the first preset time Tm is determined in the following manner: and dividing the detected outer ring temperature, inner fan wind gear and outer fan wind gear into corresponding intervals An, Bn, Cn and Dn, and determining a first preset low-pressure value Px and first preset time Tm according to the corresponding intervals.
2. The method according to claim 1, characterized in that: step S03 further includes: determining a second preset low-voltage value Py and a second preset time Ta according to the detected outer ring temperature, inner fan wind shield and outer fan wind shield;
step S05 is also included after S04: and after the air-conditioning system enters the anti-freezing and cleaning mode, detecting a second low pressure value Pm of the air-conditioning system in real time, and when the time Tp when the Pm is more than or equal to Py is more than or equal to Ta, exiting the anti-freezing mode.
3. The method according to claim 2, characterized in that: step S05 is followed by step S06 wherein the air conditioning system returns to step S02 after exiting the freeze protection mode.
4. The method according to claim 2, characterized in that: in step S03, the manner of determining the second preset low voltage value Py and the second preset time Ta according to the detected outer ring temperature, inner fan gear and outer fan gear is as follows: and dividing the detected outer ring temperature, inner fan wind gear and outer fan wind gear into corresponding intervals An, Bn, Cn and Dn, and determining a second preset low-voltage value Py and a second preset time Ta according to the corresponding intervals.
5. The method according to any one of claims 1 to 4, characterized in that: the specific way for the air conditioning system to enter the anti-freeze cleaning mode in the step S04 is as follows: the compressor of the air conditioning system is closed, the outer fan is closed, and the inner fan runs at a low gear.
6. The method according to any one of claims 1 to 4, characterized in that: the anti-freezing method is used for preventing the evaporator of the air conditioning system from freezing.
7. An air conditioning system comprising a controller, characterized in that: the controller is used for implementing the anti-freezing method as claimed in any one of claims 1-6.
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| CN111059698A (en) * | 2019-12-09 | 2020-04-24 | 珠海格力电器股份有限公司 | Air conditioner electric heating defrosting control method, computer readable storage medium and air conditioner |
| CN111219818B (en) * | 2020-01-17 | 2021-09-03 | 珠海格力电器股份有限公司 | Air conditioning system, air conditioner and control method of air conditioner |
| CN111457556A (en) * | 2020-04-21 | 2020-07-28 | 宁波奥克斯电气股份有限公司 | Anti-freezing protection method and device, air conditioner and computer readable storage medium |
| CN113154639B (en) * | 2021-05-25 | 2022-07-08 | 广东积微科技有限公司 | Control method for anti-freezing protection of air conditioner |
| CN113418350B (en) * | 2021-06-25 | 2022-06-07 | 长虹美菱股份有限公司 | Refrigeration temperature regulation control system and control method thereof |
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| CN100587369C (en) * | 2007-07-25 | 2010-02-03 | 宁波奥克斯空调有限公司 | Intelligent defrosting method for air conditioner |
| JP6073652B2 (en) * | 2012-11-09 | 2017-02-01 | サンデンホールディングス株式会社 | Air conditioner for vehicles |
| JP2015148414A (en) * | 2014-02-07 | 2015-08-20 | 東芝キヤリア株式会社 | air conditioner |
| CN106524420B (en) * | 2016-11-25 | 2019-03-15 | 重庆美的通用制冷设备有限公司 | A kind of air conditioner and its Defrost method and defroster |
| CN106958923B (en) * | 2017-04-13 | 2019-06-04 | 珠海格力电器股份有限公司 | The control method and device of air conditioner defrost |
| CN108826576B (en) * | 2018-07-13 | 2019-11-29 | 珠海格力电器股份有限公司 | A kind of self-cleaning control method of fixed frequency air conditioner |
| CN109340995B (en) * | 2018-09-29 | 2020-02-07 | 奥克斯空调股份有限公司 | Anti-freezing protection control method for mobile air conditioner and air conditioner |
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