CN104764140A - Method for controlling condensing pressure of refrigeration air-conditioning unit - Google Patents
Method for controlling condensing pressure of refrigeration air-conditioning unit Download PDFInfo
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- CN104764140A CN104764140A CN201510122445.1A CN201510122445A CN104764140A CN 104764140 A CN104764140 A CN 104764140A CN 201510122445 A CN201510122445 A CN 201510122445A CN 104764140 A CN104764140 A CN 104764140A
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- fan
- frequency conversion
- conversion fan
- frequently
- frequency
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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
-
- 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
Abstract
The invention provides a method for controlling the condensing pressure of a refrigeration air-conditioning unit. A cooling fan of the refrigeration air-conditioning unit comprises a group of variable frequency fans and at least a group of fixed frequency fans; the method comprises the steps: fan start control and fan operation control after the fan start; the fan start control comprises: step S11: detecting an ambient temperature T, and comparing the ambient temperature T with a preset temperature T1; step S12: when T is more than T1, starting the variable frequency fans to the maximum frequencies; when T is not more than T1, starting the variable frequency fans to the preset frequency corresponding to the ambient temperature T. According to the method for controlling the condensing pressure of the refrigeration air-conditioning unit provided by the invention, the start and operation of the fan can be controlled by distinguishing the ambient temperature, so as to be beneficial for realizing the precise control of the condensing pressure and realizing the stable and reliable operation of a unit.
Description
Technical field
The present invention relates to airconditioning control field, in particular to a kind of refrigeration air-conditioning unit condensation pressure control method.
Background technology
In the application scenario of air cooled heat pump, some occasion is annual heating, needs to freeze for a long time, as computer room, manufacturability machine room.Namely these occasions not only need refrigeration summer, need refrigeration in the winter time equally.
Usually, air cooled heat pump, the design that its condensation fan adopts mainly contains three kinds, i.e. complete fixed fan design scheme frequently, fixed frequency+frequency conversion fan design, full frequency conversion fan design.
Adopt complete fixed fan design scheme frequently cannot meet low ambient temperature (general less than 0 DEG C) running refrigerating in the winter time, it is too low that high-pressure opened by blower fan, cannot set up pressure reduction.Blower fan is not opened, and high-pressure is too high, and condensation side is without heat exchange, and high voltage protective appears in system; For the unit of many group blower fans, open meeting phenomenon in handoff procedure at blower fan, system high pressure pressure oscillation is large, easily occurs the frequent start-stop of blower fan or occurs low-voltage variation.
Adopt full frequency conversion fan design unit cost too high.
Adopt the design of fixed frequency+frequency conversion fan to control complicated, main Problems existing has at present:
1, under worst cold case, frequency conversion fan be opened into maximum after, fixed blower fan is frequently opened, and air quantity increases instantaneously, and high pressure reduces rapidly and causes low pressure sharply to reduce, and makes system occur low-voltage variation;
2, under worst hot case, after compressor start, frequency conversion fan speed governing is too slow, and high pressure cannot reduce and makes unit occur high voltage protective.
Now in general air-cooled unit, outdoor condensation fan controls condensing pressure and is generally definite value, and the condensing pressure value controlled is too low easily occurs that condensing pressure is low, drags down low pressure, makes unit easily occur low-voltage variation and now energy saving in running is little also poor.The large height of condensing pressure controlled, complete machine operate power is higher, and energy saving fails to give full play of.
Summary of the invention
The present invention aims to provide and a kind ofly controls stable refrigeration air-conditioning unit condensation pressure control method.
The invention provides a kind of refrigeration air-conditioning unit condensation pressure control method, the condensation fan of refrigeration air-conditioning unit comprises one group of frequency conversion fan and at least one group blower fan frequently surely; Method comprises: fan starting control and fan starting after fan operation control; Fan starting controls to comprise: step S11: testing environment temperature T, and contrasts with preset temperature T1; Step S12: as T > T1, frequency conversion fan is opened into peak frequency, and as T≤T1, frequency conversion fan is opened into the predeterminated frequency corresponding with environment temperature T.
Further, fan operation controls to comprise: step S21: as T > T1, frequency conversion fan and the fixed separate control of blower fan frequently.
Further, frequency conversion fan and the fixed separate control of blower fan frequently comprise: step S211: frequency conversion fan controls as follows: a, and when continuous preset time t detects Pc > P1+ △ PA, frequency conversion fan raising frequency regulates; B, continuous preset time t detects that P1-△ PA < Pc≤P1+ △ PA frequency conversion fan does not regulate; C, when continuous preset time t detects Pc≤P1-△ PA, frequency conversion fan frequency reducing regulates; Step S212: fixed blower fan frequently controls as follows: a, when continuous preset time t detects Pc > P1+ △ PB, fixed blower fan frequently opens one group; B, continuous preset time t detects P1-△ PB < Pc≤P1+ △ PB, and fixed blower fan frequently keeps current group of number; C, when continuous preset time t detects Pc≤P1-△ PB, fixed blower fan frequently cuts out one group.Wherein, Pc is high-pressure, and P1 is condensing pressure control objectives value, and △ PA, △ PB are constant, and △ PB > △ PA.
Further, fan operation controls also to comprise, step S22: as T≤T1, frequency conversion fan and the fixed interrelated control of blower fan frequently.
Further, frequency conversion fan and the fixed interrelated control of blower fan frequently comprise: detect high-pressure Pc, and contrast with condensing pressure control objectives value P1; When continuous preset time t detects Pc > P1+ △ PA, continue the frequency detecting frequency conversion fan; Be not be peak frequency when frequency conversion fan, frequency conversion fan raising frequency regulates; When frequency conversion fan is peak frequency, if when preset time t detects Pc > P1+ △ PB continuously, frequency conversion fan is reduced to minimum frequency, and fixed blower fan frequently opens one group, otherwise frequency conversion fan does not regulate.
Further, frequency conversion fan and the fixed interrelated control of blower fan frequently also comprise: preset time t detects that P1-△ PA < Pc≤P1+ △ PA frequency conversion fan does not regulate continuously.
Further, frequency conversion fan and the fixed interrelated control of blower fan frequently also comprise: when continuous preset time t detects Pc≤P1-△ PA, continue the frequency detecting frequency conversion fan; Be not be minimum frequency when frequency conversion fan, frequency conversion fan frequency reducing regulates; When frequency conversion fan is minimum frequency, if when preset time t detects Pc≤P1-△ PB continuously, frequency conversion fan rises to peak frequency, and fixed blower fan frequently cuts out one group, otherwise frequency conversion fan does not regulate.
According to refrigeration air-conditioning unit condensation pressure control method of the present invention, by distinguishing environment temperature, controlling the start-up and operation of blower fan, thus being conducive to the accurate control realizing condensing pressure, realizing set steady reliability service.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 controls schematic diagram according to the fan starting of refrigeration air-conditioning unit condensation pressure control method of the present invention;
Fig. 2 controls schematic diagram according to the fan operation of refrigeration air-conditioning unit condensation pressure control method of the present invention.
Detailed description of the invention
Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
As shown in Figure 1, according to refrigeration air-conditioning unit condensation pressure control method of the present invention, the condensation fan of refrigeration air-conditioning unit comprises one group of frequency conversion fan and at least one group blower fan frequently surely; Method comprises: fan starting control and fan starting after fan operation control; Fan starting controls to comprise: step S11: testing environment temperature T, and contrasts with preset temperature T1; Step S12: as T > T1, frequency conversion fan is opened into peak frequency, and as T≤T1, frequency conversion fan is opened into the predeterminated frequency corresponding with environment temperature T.The present invention, by distinguishing environment temperature, controls the start-up and operation of blower fan, thus is conducive to the accurate control realizing condensing pressure, realize set steady reliability service.
Particularly, the flow chart shown in composition graphs 2, the operation of blower fan controls to comprise, as T > T1, frequency conversion fan and the fixed separate control of blower fan frequently, as T≤T1, frequency conversion fan and the fixed interrelated control of blower fan frequently, thus the accurate control under realizing different temperatures.
Further, as shown in Figure 2, as T≤T1, after compressor is opened, frequency conversion fan starts to regulate.After frequency conversion fan raising frequency to highest frequency, just allow fixed frequency blower fan to open, fixed blower fan is frequently opened rear frequency conversion fan and is downconverted to low-limit frequency at once; After frequency conversion fan is downconverted to low-limit frequency, just allow the closedown of fixed frequency blower fan, fixed blower fan frequently cuts out rear frequency conversion fan horse back raising frequency to highest frequency.Namely at low ambient temperatures, affect very large owing to determining frequency fan switch one grouping machine group condensing pressure, and cause system fluctuation very large, under unlatching one group suddenly surely frequency blower fan situation, easily occur low-voltage variation.The present invention, by frequency conversion fan and the fixed interrelated control of blower fan frequently, realizes fixed blower fan coarse adjustment frequently, frequency conversion fan fine setting effect, thus realizes controlling condensing pressure accurately.
As T >=T1, compressor is opened front 1min frequency conversion fan and is adjusted to original frequency, and after compressor is opened, frequency conversion fan starts to regulate, and frequency conversion fan and the separate adjustment of fixed frequency blower fan, mutually regulate and be independent of each other.Namely at higher ambient temperatures, drive one group or one group, pass frequency blower fan surely, less on condensing pressure impact, fixed fan switch system fluctuation is frequently little, there will not be system low-voltage to protect.Independently controlled by frequency conversion fan and fixed blower fan frequently, avoid frequency conversion fan regulate too slow and occur high voltage protective problem.
More specifically, frequency conversion fan and fixed blower fan frequently independently control respectively according to following control.
Frequency conversion fan is performed as follows control:
(1), when 10s detects Pc > P1+ △ PA continuously, frequency conversion fan raising frequency regulates;
(2) 10s detects that P1-△ PA < Pc≤P1+ △ PA frequency conversion does not regulate continuously;
(3), when 10s detects Pc≤P1-△ PA continuously, frequency conversion fan raising frequency regulates;
Fixed blower fan is frequently performed as follows control:
(1), when 10s detects Pc > P1+ △ PB continuously, fixed blower fan frequently opens one group;
Continuously 10s detect P1-△ PB < Pc≤P1+ △ PB surely frequently blower fan keep current group of number;
(3), when 10s detects Pc≤P1-△ PB continuously, fixed blower fan frequently cuts out one group.
It should be noted that, Pc is high-pressure, i.e. exhaust outlet of compressor place pressure, and Pe is low pressure, i.e. compressor air suction mouth place pressure; Tc is condensation temperature, the saturation temperature that namely high-pressure is corresponding; T is outdoor environment temperature; △ P is constant, and scope is between 300 ~ 700kpa; △ PA is constant, and △ PB is constant, and △ PB > △ PA; P1 is condensing pressure control objectives value.
When saturation temperature≤0 DEG C that Pe is corresponding, P1=△ Pc;
As the saturation temperature > 0 DEG C that Pe is corresponding, P1=△ P+Pe;
Wherein: △ P is constant, general 300kpa ~ 700kpa, but according to different group setup different value; △ Pc is constant, is generally 1200kpa ~ 1600kpa.
As can be seen from the above description, the above embodiments of the present invention achieve following technique effect:
According to refrigeration air-conditioning unit condensation pressure control method of the present invention, by adopting the thinking of one group of frequency conversion fan and the fixed blower fan Mixed Design frequently of many groups.Distinguish outdoor environment temperature and control frequency conversion fan and fixed blower fan frequently.Frequency conversion fan and the fixed interrelated control of blower fan frequently at low ambient temperatures, the separate control of frequency conversion fan at a high ambient temperature.Realize condensing pressure precisely to control.Thus realize set steady reliability service.Condensing pressure desired value will be controlled associate with low pressure, thus reasonably control condensing pressure, realize that unit is energy-efficient, reliability service.When unit low pressure is lower, by regulating fan delivery, promotes high-pressure, low pressure is raised, make unit not occur the standby and low-voltage variation of low pressure.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. a refrigeration air-conditioning unit condensation pressure control method, the condensation fan of described refrigeration air-conditioning unit comprises one group of frequency conversion fan and at least one group blower fan frequently surely; It is characterized in that, described method comprises: fan starting control and fan starting after fan operation control;
Described fan starting controls to comprise:
Step S11: testing environment temperature T, and contrast with preset temperature T1;
Step S12: as T > T1, described frequency conversion fan is opened into peak frequency, and as T≤T1, described frequency conversion fan is opened into the predeterminated frequency corresponding with described environment temperature T.
2. refrigeration air-conditioning unit condensation pressure control method according to claim 1, is characterized in that,
Described fan operation controls to comprise:
Step S21: as T > T1, described frequency conversion fan and the described fixed separate control of blower fan frequently.
3. refrigeration air-conditioning unit condensation pressure control method according to claim 2, is characterized in that, described frequency conversion fan and the described fixed separate control of blower fan frequently comprise:
Step S211: frequency conversion fan controls as follows:
A, when continuous preset time t detects Pc > P1+ △ PA, described frequency conversion fan raising frequency regulates;
B, continuous preset time t detects that described in P1-△ PA < Pc≤P1+ △ PA, frequency conversion fan does not regulate;
C, when continuous preset time t detects Pc≤P1-△ PA, described frequency conversion fan frequency reducing regulates;
Step S212: fixed blower fan frequently controls as follows:
A, when continuous preset time t detects Pc > P1+ △ PB, described fixed blower fan frequently opens one group;
B, continuous preset time t detects P1-△ PB < Pc≤P1+ △ PB, and described fixed blower fan frequently keeps current group of number;
C, when continuous preset time t detects Pc≤P1-△ PB, described fixed blower fan frequently cuts out one group.
Wherein, Pc is high-pressure, and P1 is condensing pressure control objectives value, and △ PA, △ PB are constant, and △ PB > △ PA.
4. refrigeration air-conditioning unit condensation pressure control method according to claim 2, is characterized in that,
Described fan operation controls also to comprise, step S22: as T≤T1, described frequency conversion fan and the described fixed interrelated control of blower fan frequently.
5. refrigeration air-conditioning unit condensation pressure control method according to claim 4, is characterized in that, described frequency conversion fan and the described fixed interrelated control of blower fan frequently comprise:
Detect high-pressure Pc, and contrast with condensing pressure control objectives value P1;
When continuous preset time t detects Pc > P1+ △ PA, continue the frequency detecting described frequency conversion fan;
Be not be peak frequency when described frequency conversion fan, described frequency conversion fan raising frequency regulates;
When described frequency conversion fan is peak frequency, if when preset time t detects Pc > P1+ △ PB continuously, described frequency conversion fan is reduced to minimum frequency, and described fixed blower fan frequently opens one group, otherwise described frequency conversion fan does not regulate.
6. refrigeration air-conditioning unit condensation pressure control method according to claim 5, is characterized in that, described frequency conversion fan and the described fixed interrelated control of blower fan frequently also comprise:
Continuous preset time t detects that described in P1-△ PA < Pc≤P1+ △ PA, frequency conversion fan does not regulate.
7. refrigeration air-conditioning unit condensation pressure control method according to claim 5, is characterized in that, described frequency conversion fan and the described fixed interrelated control of blower fan frequently also comprise:
When continuous preset time t detects Pc≤P1-△ PA, continue the frequency detecting described frequency conversion fan;
Be not be minimum frequency when described frequency conversion fan, described frequency conversion fan frequency reducing regulates;
When described frequency conversion fan is minimum frequency, if when preset time t detects Pc≤P1-△ PB continuously, described frequency conversion fan rises to peak frequency, and described fixed blower fan frequently cuts out one group, otherwise described frequency conversion fan does not regulate.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105135630A (en) * | 2015-10-14 | 2015-12-09 | 珠海格力电器股份有限公司 | Air conditioning unit control method and device |
| CN105276881A (en) * | 2015-10-15 | 2016-01-27 | 珠海格力电器股份有限公司 | Running control method of condensing unit |
| CN106052008A (en) * | 2016-05-20 | 2016-10-26 | 弗德里希新能源科技(杭州)股份有限公司 | Adjusting method for condensation temperature and evaporation temperature during unit operation |
| CN106679066A (en) * | 2016-11-17 | 2017-05-17 | 珠海格力电器股份有限公司 | Unit fault judging method and device |
| CN106949581A (en) * | 2017-02-28 | 2017-07-14 | 深圳市艾特网能技术有限公司 | Frequency-conversion air-conditioning system and its control method |
| CN107152822A (en) * | 2017-06-23 | 2017-09-12 | 广东美的暖通设备有限公司 | Control method, air conditioner and the storage medium of outdoor unit |
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| CN107388474A (en) * | 2017-06-06 | 2017-11-24 | 珠海格力电器股份有限公司 | Control method, device and the controller and storage medium and processor of air-conditioning system |
| CN107152822A (en) * | 2017-06-23 | 2017-09-12 | 广东美的暖通设备有限公司 | Control method, air conditioner and the storage medium of outdoor unit |
| CN107467704A (en) * | 2017-07-25 | 2017-12-15 | 广州能之原科技股份有限公司 | A kind of tobacco heat pump dryer alarm for high voltage processing method and system |
| CN111397433A (en) * | 2018-12-13 | 2020-07-10 | 江苏恒立液压股份有限公司 | Control method for controlling variable frequency motor through frequency converter |
| CN110006139A (en) * | 2019-03-04 | 2019-07-12 | 青岛海尔空调电子有限公司 | Control method for air-cooled magnetic suspension unit |
| CN110440406A (en) * | 2019-08-05 | 2019-11-12 | 珠海格力电器股份有限公司 | A kind of blower control method, device and unit equipment |
| CN111998446A (en) * | 2020-08-17 | 2020-11-27 | 深圳中集天达吉荣航空制冷有限公司 | Airplane ground air conditioning unit and cold quantity control method thereof |
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