CN102109207A - Multi-compressor air conditioner control method and system - Google Patents
Multi-compressor air conditioner control method and system Download PDFInfo
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- CN102109207A CN102109207A CN2009101894265A CN200910189426A CN102109207A CN 102109207 A CN102109207 A CN 102109207A CN 2009101894265 A CN2009101894265 A CN 2009101894265A CN 200910189426 A CN200910189426 A CN 200910189426A CN 102109207 A CN102109207 A CN 102109207A
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Abstract
The invention relates to a multi-compressor air conditioner control method which comprises the following steps: a, judging whether the absolute value of difference between the first temperature measured by a temperature sensor and the set temperature set by a temperature setting unit exceeds a first threshold, and if the absolute value exceeds the first threshold, executing step b; b, starting one compressor and accumulating the operation time of the compressor; judging whether the absolute value of difference between the second temperature measured by the temperature sensor and the set temperature set by the temperature setting unit exceeds a second threshold, and if the absolute value exceeds the second threshold, executing step c, wherein the second threshold is greater than the first threshold; and c, starting another compressor and accumulating the operation time of the compressor. The invention also relates to a corresponding control system. According to the invention, the working states of multiple compressors are adjusted by detecting the backwater temperature of chilled water in real time, thus the service life of equipment is prolonged on the basis of maintaining the reliable work of the system.
Description
Technical field
The present invention relates to field of air conditioning, more specifically, relate to a kind of control method and system with air-conditioning of multi-compressor.
Background technology
Traditional air-conditioning adopts the single compressor refrigeration system, and there are many deficiencies in this system, and for example the long-time running meeting of unit causes the mechanical fatigue of compressor, thereby shortens the service life of compressor; Single compressor assembly can not be made correspondingly adjusting according to environment temperature and load variations.
Existing high-performance air-conditioner often adopts double-compressor to carry out work.Yet these double-compressor air-conditionings are when operation, and efficient is lower during each compressor collaborative work.
Summary of the invention
The technical problem to be solved in the present invention is, at the lower problem of above-mentioned double-compressor air-conditioning efficient, provides a kind of multi-compressor air conditioning control method and system.
The technical scheme that the present invention solves the problems of the technologies described above is, a kind of multi-compressor air conditioning control method is provided, described air-conditioning comprises temperature sensor, temperature setup unit and at least two group compressors that are used to measure freezing/cooling water return water temperature, may further comprise the steps:
A, judge whether the absolute value of the difference of the design temperature that first temperature that temperature sensor records and temperature setup unit are set surpasses first threshold and execution in step b when surpassing first threshold;
B, start one group of compressor wherein and accumulate running time of this compressor, the absolute value of judging the difference of the design temperature that second temperature that temperature sensor records and temperature setup unit are set whether surpass second threshold value and when surpassing second threshold value execution in step c, wherein said second threshold value is greater than first threshold;
C, start another group compressor and accumulate running time of this compressor.
In multi-compressor air conditioning control method of the present invention, comprise that also compressor mode determining step, described compressor mode comprise single compressor pattern and multi-compressor pattern before the described step a.
In multi-compressor air conditioning control method of the present invention, when being judged as the single compressor pattern, starting selected compressor and accumulate running time of this compressor.
In multi-compressor air conditioning control method of the present invention, described step b comprises:
The total run time of b1, more described at least two group compressors;
B2, start one group of the shortest compressor of total run time in the described at least two group compressors and accumulate running time of this compressor.
In multi-compressor air conditioning control method of the present invention, comprise after the described step c:
C1, serviceability temperature sensor measurement the 3rd temperature;
C2, judge that whether the absolute value of the difference of the 3rd temperature and design temperature surpasses the 3rd threshold value, if be no more than then execution in step c3 of the 3rd threshold value, described the 3rd threshold value is less than first threshold;
The total run time of c3, more described at least two group compressors;
C4, close one group of the longest compressor of total run time in the described at least two group compressors.
In multi-compressor air conditioning control method of the present invention, the step that starts compressor specifically comprises:
Open chilled water pump, heat-exchanger pump and cooling water pump;
Judge whether compressor surpasses the 4th threshold value apart from the time of shutting down last time;
When distance downtime last time surpasses the 4th threshold value, start compressor, otherwise start compressor with the 4th threshold value countdown.
In multi-compressor air conditioning control method of the present invention, also comprise the operational mode determining step before the described step a, described operational mode comprises refrigeration mode and heating mode.
In multi-compressor air conditioning control method of the present invention; comprise also before the described step a that running status detects step; and at running status execution in step a just often; also close otherwise report to the police, described running status detect comprise whether temperature sensor self check, overheat of compressor protective relay closed, compressor carry protective relay whether closure, Compressor Discharge Pressure, compressor return air pressure, three-phase phase-sequence is protected and/or whether chilled water leaving water temperature actual value normal.
The present invention also provides a kind of multi-compressor air-conditioner control system, comprise the temperature sensor that is used to measure freezing/cooling water return water temperature, performance element, temperature setup unit and at least two group compressors, startup one group of compressor wherein when the absolute value of the difference of first temperature that the design temperature that described performance element is set at the temperature setup unit and temperature sensor record surpasses first threshold, the absolute value of the difference of this performance element second temperature that described temperature sensor records behind described one group of compressor start and described design temperature starts another group compressor when surpassing second threshold value, described first threshold is less than second threshold value.
In multi-compressor air-conditioner control system of the present invention, close at least one group of compressor when the absolute value of the difference of described performance element the 3rd temperature that described temperature sensor records behind described many group compressor starts and described design temperature is no more than the 3rd threshold value, described the 3rd threshold value is less than first threshold.
Multi-compressor air conditioning control method of the present invention and system adjust the duty of a plurality of compressors by real-time detection chilled water return water temperature, thereby prolong the service life of equipment on the basis that keeps system's reliably working.In addition; the present invention can realize self-shield, warning and alarm record; but for example state of the state of detected temperatures sensor, water flow switch, Compressor Discharge Pressure, back pressure, overheat of compressor protection, overload of compressor protection, three phase mains and leaving water temperature etc. are understood equipment state and are maintained easily with convenient.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the structural representation of multi-compressor air-conditioner control system embodiment of the present invention;
Fig. 2 is the wiring schematic diagram of multi-compressor air-conditioner control system among Fig. 1;
Fig. 3 is the schematic flow sheet of multi-compressor air conditioning control method embodiment of the present invention.
The specific embodiment
Multi-compressor air-conditioner control system of the present invention and method are used to realize that the air-conditioning to comprising a plurality of compressors controls, and mainly realize by the PLC program with upper machine communication.
As shown in Figure 1, be the structural representation of multi-compressor air-conditioner control system embodiment of the present invention.In the present embodiment, this system comprises the temperature sensor 14, performance element 11, temperature setup unit 15 and at least two group compressors 12,13 that are used for measuring chilled water return water temperature/cooling water return water temperature (figure only illustrates two groups of compressors, and the present invention can be applicable to have in the air-conditioning of multi-compressor more).Air-conditioning itself comprises the condenser, device for drying and filtering, the evaporimeter that are connected successively with compressor one, be arranged on chilled water outlet pipe on the condenser and chilled water return pipe etc.Performance element 11 can be the PLC controller of an operation control program.Temperature sensor 14 is arranged on the chilled water return pipe.
In the present embodiment, the absolute value of the difference of first temperature that the design temperature that performance element 11 is set at temperature setup unit 15 and temperature sensor 14 record is above first threshold (when for example first threshold is 2 ℃, first temperature surpasses 2 ℃ of design temperatures under refrigeration mode, first temperature is less than 2 ℃ of design temperatures under the heating mode) time start wherein one group of compressor (for example starting the shortest compressor of total run time), the absolute value of the difference of this performance element 11 second temperature that temperature sensor records behind one group of compressor start and design temperature surpasses second threshold value (when for example second threshold value is 4 ℃, second temperature surpasses 4 ℃ of design temperatures under refrigeration mode, second temperature is less than 4 ℃ of design temperatures under the heating mode) time start another the group compressor, wherein first threshold is less than second threshold value.
Be the protection compressor, can when confirming that compressor surpasses the 4th threshold value (for example 3 minutes) apart from the time of cutting out last time, restart this compressor, otherwise start compressor after waiting for 3 minutes.
In said system, performance element 11 is behind two groups of compressor starts, the absolute value of the 3rd temperature that temperature sensor records and the difference of design temperature is no more than the 3rd threshold value (when for example the 3rd threshold value is 1 ℃, the 3rd temperature surpasses 1 ℃ of design temperature under refrigeration mode, the 3rd temperature is less than 1 ℃ of design temperature under the heating mode) time close wherein one group of compressor (for example closing total the longest compressor running time), the 3rd threshold value is less than first threshold.
In said system, also can comprise air-conditioning setup unit (not shown), be used for before the air-conditioning start, being provided with the compressor mode (for example single compressor pattern, double-compressor pattern etc.) and the operational mode (for example refrigeration mode, heating mode etc.) of air-conditioning.
Said system also can comprise alarm unit, is used in the operation of air conditioner process, and the state that is arranged on the sensor of each position of air-conditioning by detection is monitored the running status of air-conditioning, and reports to the police when running state of air conditioner is undesired.Above-mentioned running status comprises that temperature sensor, overheat of compressor protective relay, compressor carry protective relay, Compressor Discharge Pressure, compressor return air pressure, three-phase phase-sequence protection and/or chilled water leaving water temperature actual value etc.
As shown in Figure 2, be the schematic diagram of the specific implementation of control system among Fig. 1.Part label among the figure is as shown in the table:
| 52C1、2 | The compressor A.C. contactor | 51C1、 2 | The compressor heat overload protective device |
| CM1、2 | Compressor electric motor | V5 | Cooling water pump |
| ABJ | Phase sequence relay | INT | The compressor protection module |
| V3 | Chilled water pump | FU | Safety box |
| V4 | Heat-exchanger pump | BS | Emergency stop switch |
As shown in Figure 3, be the flow chart of multi-compressor air conditioning control method embodiment of the present invention, wherein this air-conditioning comprises temperature sensor, temperature setup unit and at least two group compressors that are used to measure the chilled water return water temperature, this method may further comprise the steps:
Step S31: the chilled water return water temperature by temperature sensor measurement this moment is as first temperature, and whether the absolute value of judging the difference of the design temperature that first temperature that temperature sensor records and temperature setup unit are set surpasses first threshold (for example 2 ℃) and when surpassing first threshold execution in step S32, otherwise continue to measure first temperature and judge measured value.
Step S32: start one group of compressor wherein and accumulate running time of this compressor.
Step S33: by temperature sensor measurement this moment the chilled water return water temperature as second temperature, and judge whether second temperature that temperature sensor records reaches design temperature, as if reaching then execution in step S34 of design temperature, otherwise execution in step S35.
Step S34: close the compressor that starts among the step S32.
Step S35: the absolute value of judging the difference of the design temperature that second temperature and temperature setup unit are set whether surpass second threshold value (for example 4 ℃) and when surpassing second threshold value execution in step S36, wherein second threshold value is greater than first threshold.
Step S36: start the running time that another is organized compressor and accumulates this compressor.
Step S37: the chilled water return water temperature by temperature sensor measurement this moment is as the 3rd temperature, and whether the absolute value of judging the difference of the design temperature that the 3rd temperature and temperature setup unit are set surpasses the 3rd threshold value (for example 1 ℃) and execution in step S38 when surpassing the 3rd threshold value, otherwise execution in step S39, wherein the 3rd threshold value is less than first threshold.
Step S37: keep two compressor operatings.
Step S38: close a compressor, and return step S35.
In said method, before step S31, also comprise the compressor mode determining step, wherein compressor mode comprises single compressor pattern and multi-compressor pattern.When being judged as the single compressor pattern, recording temperature actuated selected compressor and accumulate running time of this compressor according to temperature sensor.
In said method, step S32 can compare the total run time of two groups of compressors when selecting to start compressor, and starts one group of the shortest compressor of total run time in two groups of compressors, accumulates the running time of this compressor simultaneously.
In said method, the step that starts compressor specifically comprises:
Open chilled water pump, heat-exchanger pump and cooling water pump;
Judge whether compressor surpasses the 4th threshold value apart from the time of shutting down last time;
When distance downtime last time surpasses the 4th threshold value (for example three minutes), start compressor, otherwise start compressor with the 4th threshold value countdown.
In said method, also can comprise the operational mode determining step, wherein operational mode comprises refrigeration mode and heating mode, thereby can freeze or heat according to operational mode.
In said method; also can comprise the step that running status detects; and when running status is unusual, hold warning, wherein running status detect comprise whether temperature sensor self check, overheat of compressor protective relay closed, compressor carry protective relay whether closure, Compressor Discharge Pressure, compressor return air pressure, three-phase phase-sequence is protected and/or whether chilled water leaving water temperature actual value normal etc.
The above; only for the preferable specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (10)
1. multi-compressor air conditioning control method, described air-conditioning comprise temperature sensor, temperature setup unit and at least two group compressors that are used to measure freezing/cooling water return water temperature, it is characterized in that, may further comprise the steps:
A, judge whether the absolute value of the difference of the design temperature that first temperature that temperature sensor records and temperature setup unit are set surpasses first threshold and execution in step b when surpassing first threshold;
B, start one group of compressor wherein and accumulate running time of this compressor, the absolute value of judging the difference of the design temperature that second temperature that temperature sensor records and temperature setup unit are set whether surpass second threshold value and when surpassing second threshold value execution in step c, wherein said second threshold value is greater than first threshold;
C, start another group compressor and accumulate running time of this compressor.
2. multi-compressor air conditioning control method according to claim 1 is characterized in that, comprises that also compressor mode determining step, described compressor mode comprise single compressor pattern and multi-compressor pattern before the described step a.
3. multi-compressor air conditioning control method according to claim 2 is characterized in that, when being judged as the single compressor pattern, starting selected compressor and accumulates running time of this compressor.
4. multi-compressor air conditioning control method according to claim 1 is characterized in that, described step b comprises:
The total run time of b1, more described at least two group compressors;
B2, start one group of the shortest compressor of total run time in the described at least two group compressors and accumulate running time of this compressor.
5. multi-compressor air conditioning control method according to claim 4 is characterized in that, comprises after the described step c:
C1, serviceability temperature sensor measurement the 3rd temperature;
C2, judge that whether the absolute value of the difference of the 3rd temperature and design temperature surpasses the 3rd threshold value, if be no more than then execution in step c3 of the 3rd threshold value, described the 3rd threshold value is less than first threshold;
The total run time of c3, more described at least two group compressors;
C4, close one group of the longest compressor of total run time in the described at least two group compressors.
6. according to each described multi-compressor air conditioning control method among the claim 1-5, it is characterized in that the step that starts compressor specifically comprises:
Open chilled water pump, heat-exchanger pump and cooling water pump;
Judge whether compressor surpasses the 4th threshold value apart from the time of shutting down last time;
When distance downtime last time surpasses the 4th threshold value, start compressor, otherwise start compressor with the 4th threshold value countdown.
7. multi-compressor air conditioning control method according to claim 1 is characterized in that, also comprises the operational mode determining step before the described step a, and described operational mode comprises refrigeration mode and heating mode.
8. multi-compressor air conditioning control method according to claim 1; it is characterized in that; comprise also before the described step a that running status detects step; and at running status execution in step a just often; also close otherwise report to the police, described running status detect comprise whether temperature sensor self check, overheat of compressor protective relay closed, compressor carry protective relay whether closure, Compressor Discharge Pressure, compressor return air pressure, three-phase phase-sequence is protected and/or whether chilled water leaving water temperature actual value normal.
9. multi-compressor air-conditioner control system, comprise the temperature sensor that is used to measure freezing/cooling water return water temperature, performance element, temperature setup unit and at least two group compressors, it is characterized in that, startup one group of compressor wherein when the absolute value of the difference of first temperature that the design temperature that described performance element is set at the temperature setup unit and temperature sensor record surpasses first threshold, the absolute value of the difference of this performance element second temperature that described temperature sensor records behind described one group of compressor start and described design temperature starts another group compressor when surpassing second threshold value, described first threshold is less than second threshold value.
10. multi-compressor air-conditioner control system according to claim 9, it is characterized in that, close at least one group of compressor when the absolute value of the difference of described performance element the 3rd temperature that described temperature sensor records behind described many group compressor starts and described design temperature is no more than the 3rd threshold value, described the 3rd threshold value is less than first threshold.
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| CN113028571B (en) * | 2021-04-07 | 2022-04-22 | 广东友电新能源科技有限公司 | Compressor control method and device of machine room air conditioner, air conditioner and medium |
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Application publication date: 20110629 |