CN103925755B - Operation control method for condensation side fan unit of refrigerating system - Google Patents
Operation control method for condensation side fan unit of refrigerating system Download PDFInfo
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- CN103925755B CN103925755B CN201310021318.3A CN201310021318A CN103925755B CN 103925755 B CN103925755 B CN 103925755B CN 201310021318 A CN201310021318 A CN 201310021318A CN 103925755 B CN103925755 B CN 103925755B
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000005494 condensation Effects 0.000 title claims description 41
- 238000009833 condensation Methods 0.000 title claims description 41
- 238000005057 refrigeration Methods 0.000 claims abstract description 34
- 238000006243 chemical reaction Methods 0.000 claims description 54
- 230000000977 initiatory effect Effects 0.000 claims description 13
- 238000001514 detection method Methods 0.000 claims description 12
- 230000001276 controlling effect Effects 0.000 abstract description 5
- 230000001105 regulatory effect Effects 0.000 abstract description 4
- 230000001052 transient effect Effects 0.000 abstract 1
- 238000001816 cooling Methods 0.000 description 4
- 238000003556 assay Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
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Abstract
The invention discloses a method for controlling the operation of a condensing side fan unit of a refrigerating system, wherein the condensing side fan unit of the refrigerating system comprises a variable frequency fan and at least one fixed frequency fan, and the control method monitors the high pressure P of the systemHeight ofAnd is judged with a preset first reference value P1 and a second reference value P2 according to the high pressure PHeight ofIn the section, whether the high pressure P is needed or not is judgedHeight ofAdjusting when the high pressure P is judged to be requiredHeight ofWhen the high-pressure P is adjusted, the high-pressure P is adjusted by adjusting the operating frequency of the variable-frequency fan at a preset speedHeight ofIs regulated smoothly, avoids high pressure PHeight ofThe system is unstable due to large transient variation, thereby improving the stability of the operation of the refrigeration system.
Description
Technical field
The present invention relates to control field, it is related specifically to refrigeration system condensation side blower fan group method for controlling of operation.
Background technology
Current refrigeration system, at the blower fan of condensation side, takes a blower fan of can transferring the files more, by regulating the shelves position of blower fan to control the start and stop of blower fan, running condition. So just exist unit at low temperature environment (��-5 DEG C) even if under blower fan start with lowest gear rotating speed or operation process transferred the files increase rotation speed of fan, also changing greatly of refrigeration system high pressure pressure moment can be caused, and low pressure in refrigeration system is normally more stable, thus the difference of refrigeration system high pressure pressure and low pressure can be caused to have bigger change instantaneously.
The spiral-lobe compressor such as air-cooled screw unit used; at least to be ensured that the difference of high-pressure and low pressure is at more than 4bar; unit normal oil return in compressor could be ensured; when the difference of high-pressure and low pressure is lower than this warning pressure; likely cause fuel feeding not enough; burn compressor, affect the reliability of unit. And the change of blower fan shelves position can cause high-pressure to reduce suddenly, likely causing the difference of high-pressure and low pressure to level off to 4bar in the process reduced, the fluctuation causing machine system especially greatly, affects complete machine security, reliability.
Summary of the invention
Problem to be solved by this invention is that the refrigeration system high pressure pressure caused when being transferred the files by condensation side blower fan has larger fluctuation instantaneous, the control method of the refrigeration system that a kind of condensation side blower fan group comprises frequency conversion fan is provided, the steady adjustment of system high pressure pressure can be realized, it is to increase the stability of refrigeration system.
Refrigeration system condensation side blower fan group method for controlling of operation provided by the invention, refrigeration system condensation side blower fan group comprises a frequency conversion fan and at least one fixed blower fan frequently, and this control method comprises the following steps:
Step one: detection refrigeration system high pressure pressure PHigh, by high-pressure PHigh, with the first benchmark value P1, the 2nd benchmark value P2 compares, wherein P1 > P2; If PHigh> P1, then perform step 2, if P2 is < PHigh< P1, keeps current condensation side blower fan group running condition constant, if PHigh< P2, then reduce the running frequency of frequency conversion fan with set rate k1;Step 2: judge frequency conversion fan whether by most high frequency running, if frequency conversion fan is not with most high frequency running, then improves the running frequency of frequency conversion fan with set rate k2, if frequency conversion fan is by most high frequency running, then opens a fixed blower fan frequently more.
Further, after refrigeration system starts, following step is performed:
S1: detection refrigeration system high pressure pressure PHigh;
S2: by high-pressure PHigh, compare with the first benchmark value P1, if PHigh>=P1, then start described frequency conversion fan with predeterminated frequency, if PHigh< P1, then do not open blower fan. So, it is possible to improve unit unloading phase, it is achieved to high-pressure PHighBalance adjustment, can not occur moment larger fluctuation.
Adopt refrigeration system condensation side blower fan group method for controlling of operation provided by the invention, due to the high-pressure P of the system of having monitoredHigh, and judged with the first default benchmark value and the 2nd benchmark value, interval residing for high-pressure, judge when needing high-pressure PHighWhen regulating, first by regulating the running frequency of frequency conversion fan with set rate, it is achieved to high-pressure PHighSteady adjustment, avoid high-pressure PHighThere iing bigger variation instantaneously, causing system unstable, which thereby enhance the stability that refrigeration system is run.
Accompanying drawing explanation
Fig. 1 is the control schema of embodiments of the invention one
Embodiment
Below with reference to the accompanying drawings and the present invention is described in detail in conjunction with the embodiments. It should be noted that, when not conflicting, the feature in following embodiment and embodiment can combine mutually.
Embodiment one
In first embodiment of the invention, for Worm type air-cooled handpiece Water Chilling Units, the condensation side of this unit adopts air cooling heat exchanger, and condensation side blower fan group adopts 1 frequency conversion fan and 3 fixed blower fans frequently altogether.
Set the high-pressure P of this unitHighDetermining reference value, the first benchmark value P1 is 14bar, and the 2nd benchmark value P2 is 9bar, system high pressure protection pressure PProtectFor 26bar; Set the high-pressure P of this unitHighAssay intervals time t0For 10s, it is found by the applicant that, it is to increase the air quantity of condensation side blower fan group, it is possible to reduce refrigeration system high pressure pressure PHigh, reduce the air quantity of condensation side blower fan group, high-pressure P can be raisedHigh. In the first embodiment, control method condensation side blower fan group specifically performed is as follows:
S1, unit are started shooting;
S2, detection high-pressure PHighIf, PHigh> 14bar, then open frequency conversion fan with the minimum initiation culture of frequency conversion fan, if PHigh�� 14bar, then the fan operation situation keeping unit current is constant, does not namely open blower fan;
S3, detection high-pressure PHighIf, PHigh> 14bar, performs S4, if 9bar is < PHigh< 14bar, the fan operation situation keeping unit current is constant, if PHigh< 9bar, then reduce the frequency of frequency conversion fan with set rate k1, until frequency conversion fan is shut down;
If the non-full gear running of S4 frequency conversion fan, then promote the frequency of frequency conversion fan with set rate k2, until frequency conversion fan full gear is run, if frequency conversion fan full gear running, then continue to open a fixed blower fan frequently, until all blower fans are all opened.
At interval of 10s, perform a S3.
Wherein, set rate k1 and k2 is 2%, i.e. k1=k2=2%*A/s that every second regulates frequency conversion fan rated frequency A. According to the requirement of sharpness of regulation, can certainly suitably improve or reduce set rate k1 or k2.
A high-pressure P in officeHighDetection in, if PHigh>=26bar, then judge that system pressure is too high, perform shutdown at once, carry out system protection.
Certainly, the quantity determining frequency blower fan in the present embodiment can also be adjusted to other quantity according to air cooling heat exchanger capacity, it is preferable to odd number, such as, can also be 5 or 7 etc.
Embodiment two
In second embodiment of the invention, for Worm type air-cooled handpiece Water Chilling Units, the condensation side of this unit adopts air cooling heat exchanger, and condensation side blower fan group adopts 1 frequency conversion fan and 3 fixed blower fans frequently altogether.
Set the high-pressure P of this unitHighDetermining reference value, the first benchmark value P1 is 9bar, and the 2nd benchmark value P2 is 14bar, system high pressure protection pressure PProtectFor 26bar; Set the high-pressure P of this unitHighAssay intervals time t0For 10s, control method condensation side blower fan group specifically performed is as follows:
S1, unit are started shooting;
S2, detection high-pressure PHighIf, PHigh> 14bar, then detect the envrionment temperature T of condensation side, interval residing for the envrionment temperature T of condensation side, it is determined that the initiation culture A of frequency conversion fan0And start this frequency conversion fan; If PHigh�� 14bar, then the fan operation situation keeping unit current is constant, does not namely open blower fan;
S3, detection high-pressure PHighIf, PHigh> 14bar, performs S4, if 9bar is < PHigh< 14bar, the fan operation situation keeping unit current is constant, if PHigh< 9bar, then reduce the frequency of frequency conversion fan with set rate k1, until frequency conversion fan is shut down;
If the non-full gear running of S4 frequency conversion fan, then promote the frequency of frequency conversion fan with set rate k2, until frequency conversion fan full gear is run, if frequency conversion fan full gear running, then continue to open a fixed blower fan frequently, until blower fan is all opened.
At interval of 10s, perform a S3.
Wherein, set rate k1 regulates the 2%, i.e. k1=2%*A/s of frequency conversion fan rated frequency A in every second. And set rate k2 regulates the 3%, i.e. k2=3%*A/s of frequency conversion fan rated frequency A in every second. According to the requirement of sharpness of regulation, can certainly suitably improve or reduce set rate k1 or k2.
A high-pressure P in officeHighDetection in, if PHigh>=26bar, then judge that system pressure is too high, perform shutdown at once, carry out system protection.
In S2 step, the residing interval initiation culture A with frequency conversion fan of the envrionment temperature T of condensation side0Relation can according to the environmental quality of different areas, it is set in advance in the controller of unit, such as the area that range of temperature is bigger, the envrionment temperature T of condensation side can be decomposed into 5 temperature ranges, the respectively different ratios of corresponding frequency conversion fan rated frequency A, the interval corresponding frequency of differing temps, minimum can not lower than the minimum initiation culture of frequency conversion fan, such as, when minimum initiation culture is the 10% of rated frequency, shown in concrete following table:
For the area that range of temperature is less, it is possible to the envrionment temperature T of condensation side is decomposed into 3 temperature ranges, corresponding to the different ratios of frequency conversion fan rated frequency.
Temperature residing for the envrionment temperature T of condensation side determines the initiation culture of frequency conversion fan, it is possible to frequency conversion fan more early must be entered in rational operating range, make unit enter the state of steady running sooner.
Certainly, the quantity determining frequency blower fan in the present embodiment can also be adjusted to other quantity according to air cooling heat exchanger capacity, it is preferable to odd number, such as, can also be 5 or 7 etc.
The above embodiment only have expressed several enforcement modes of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to patent scope of the present invention. , it is also possible to make some distortion and improvement, it should be appreciated that for the person of ordinary skill of the art, without departing from the inventive concept of the premise these all belong to protection scope of the present invention. Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. refrigeration system condensation side blower fan group method for controlling of operation, described refrigeration system condensation side blower fan group comprises a frequency conversion fan and at least one fixed blower fan frequently, it is characterised in that, comprise the following steps:
Step one: detection refrigeration system high pressure pressure PHigh, by high-pressure PHighCompare with the first benchmark value P1 and the 2nd benchmark value P2, wherein P1 > P2; If PHigh> P1, then perform step 2, if P2 is < PHigh< P1, keeps current condensation side blower fan group running condition constant, if PHigh< P2, then reduce the running frequency of frequency conversion fan with set rate k1;
Step 2: judge frequency conversion fan whether by most high frequency running, if frequency conversion fan is not with most high frequency running, then improve the running frequency of described frequency conversion fan with set rate k2, if frequency conversion fan is by most high frequency running, then open a described fixed blower fan frequently more.
2. refrigeration system condensation side blower fan group method for controlling of operation as claimed in claim 1, it is characterised in that, after refrigeration system starts, perform following step:
Detection refrigeration system high pressure pressure PHigh, by high-pressure PHigh, compare with the first benchmark value P1, if PHigh>=P1, then start described frequency conversion fan with predeterminated frequency, if PHigh< P1, then do not open blower fan.
3. refrigeration system condensation side blower fan group method for controlling of operation as claimed in claim 2, it is characterised in that, described predeterminated frequency is the minimum initiation culture of frequency conversion fan.
4. refrigeration system condensation side blower fan group method for controlling of operation as claimed in claim 1, it is characterised in that, set the envrionment temperature T of condensation side and the initiation culture A of frequency conversion fan in advance0Relation, refrigeration system start shooting after, perform following step:
Detection refrigeration system high pressure pressure PHigh, by high-pressure PHighCompare with the first benchmark value P1, if PHigh>=P1, continues the envrionment temperature T of detection condensation side, determines the initiation culture A of described frequency conversion fan according to the envrionment temperature T of condensation side0, and start described frequency conversion fan, if PHigh< P1, then do not open blower fan.
5. refrigeration system condensation side blower fan group method for controlling of operation as claimed in claim 4, it is characterised in that, the envrionment temperature T of described condensation side is divided into some intervals, the initiation culture A of the frequency conversion fan that each interval is corresponding different respectively0��
6. refrigeration system condensation side blower fan group method for controlling of operation as claimed in claim 5, it is characterised in that, the envrionment temperature T of described condensation side, the initiation culture A of frequency conversion fan0And the rated frequency A of frequency conversion fan meets following relation:
As T > 15 DEG C, A0=100%A;
When 5 DEG C of < T��15 DEG C, A0=80%A;
When-5 DEG C of < T��5 DEG C, A0=50%A;
When-15 DEG C of < T��-5 DEG C, A0=30%A;
When T��-15 DEG C, A0=10%A.
7. refrigeration system condensation side blower fan group method for controlling of operation as described in claim 4 or 5, it is characterised in that, described initiation culture A0It is not less than the minimum initiation culture of frequency conversion fan.
8. refrigeration system condensation side blower fan group method for controlling of operation as claimed in claim 1 or 2, it is characterised in that, described set rate k1 and k2 is 1%��3% that every second regulates frequency conversion fan rated frequency A.
9. refrigeration system condensation side blower fan group method for controlling of operation as claimed in claim 1 or 2, it is characterized in that, described set rate k1 regulates the 2%, described set rate k2 of frequency conversion fan rated frequency A to be regulate the 3% of frequency conversion fan rated frequency A in every second for every second.
10. refrigeration system condensation side blower fan group method for controlling of operation as claimed in claim 1, it is characterised in that, at interval of time t0, perform a step one.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310021318.3A CN103925755B (en) | 2013-01-16 | 2013-01-16 | Operation control method for condensation side fan unit of refrigerating system |
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| CN201310021318.3A CN103925755B (en) | 2013-01-16 | 2013-01-16 | Operation control method for condensation side fan unit of refrigerating system |
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| CN103925755A CN103925755A (en) | 2014-07-16 |
| CN103925755B true CN103925755B (en) | 2016-06-08 |
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| CN104180573A (en) * | 2014-08-19 | 2014-12-03 | 重庆耐德能源装备集成有限公司 | Cooling system |
| CN104596054B (en) * | 2014-12-26 | 2017-10-31 | 珠海格力电器股份有限公司 | air conditioning unit fan control method and device |
| CN104764140B (en) * | 2015-03-19 | 2018-01-09 | 珠海格力电器股份有限公司 | Condensing pressure control method for refrigerating air conditioning unit |
| CN107178880A (en) * | 2017-07-03 | 2017-09-19 | 珠海格力电器股份有限公司 | method and device for controlling air conditioner |
| DE102017214941A1 (en) | 2017-08-25 | 2019-02-28 | Dometic Sweden Ab | Recreational vehicle, cooling device, control system and method of controlling the cooling device |
| DE112018005002T5 (en) | 2017-10-27 | 2020-07-16 | Dometic Sweden Ab | SYSTEMS, METHODS AND DEVICES FOR PROVIDING COMMUNICATION BETWEEN AIR-CONDITIONING CONTROL DEVICES IN A MOTORHOME |
| CN108006919B (en) * | 2017-11-15 | 2020-02-11 | 珠海格力电器股份有限公司 | Evaporative cooling type water chilling unit, and control method and control system thereof |
| CN111750481B (en) * | 2019-03-27 | 2022-06-07 | 日立江森自控空调有限公司 | Air conditioner control method and air conditioner system |
| CN112361682A (en) * | 2020-10-15 | 2021-02-12 | 珠海格力电器股份有限公司 | Water chilling unit control method and device and water chilling unit |
| CN115628530B (en) * | 2022-10-26 | 2024-06-14 | 珠海格力电器股份有限公司 | Fan control method, device and unit |
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