CN105649988A - Determination method for load percentage of stepless screw compressor - Google Patents
Determination method for load percentage of stepless screw compressor Download PDFInfo
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- CN105649988A CN105649988A CN201410635432.XA CN201410635432A CN105649988A CN 105649988 A CN105649988 A CN 105649988A CN 201410635432 A CN201410635432 A CN 201410635432A CN 105649988 A CN105649988 A CN 105649988A
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Abstract
The invention discloses a determination method for load percentage of a stepless screw compressor and relates to the technical field of air conditioning and refrigerating. The method comprises the steps that (1) current values corresponding to the refrigerating working condition and the heating working condition of the compressor when the press load percentage is 25%-100% are inquired through model selection software provided by a compressor manufacture respectively, and a corresponding correlation table of the current percentage X and the compressor load percentage Y is calculated and listed; and (2) corresponding formulas of the X and the Y in the refrigerating working condition and the heating working condition of the compressor are fitted respectively according to the corresponding correlation table of the current percentage X and the compressor load percentage Y, and the compressor load percentage Y is determined in real time. Compared with the prior art, the compressor load percentage can be judged without adding extra cost to a unit, so that the service life of the compressor is prolonged, and the method has the characteristics of being simple and accurate in result.
Description
Technical field
The present invention relates to technical field of air conditioner refrigeration, particularly without the defining method of section formula spiral-lobe compressor load per-cent.
Background technology
Screw-type compressor makes oil pressure promote the piston in piston cylinder to change spool position by the opening and closing of magnetic valve, load can be made in the intercropping stepless control of 25% ~ 100% capacity without section formula compressor, reaches stable output, improves the object of unit efficiency. Due in compressor without spool position feedback assembly, cannot directly judge current spool position, namely cannot judge the load per-cent of now unit.
In prior art, conventional following three kinds of methods judge compressor load per-cent:
One, enter oil and let out oil to determine spool position by controlling oil cylinder the switching time of magnetic valve, and then determine load per-cent. The defect of this kind of method is that guiding valve cannot move to target location when oil pressure difference is inadequate. Judging that load per-cent error is relatively big with this, compressor can be operated in part load condition for a long time, affects compressor work-ing life.
Two, the percentage of current of unit is calculated by the ratio of the current electric current of compressor with the full load current of setting, with this value as compressor load per-cent. The defect of this kind of method is along with unit working conditions change, and the full load current value of compressor changes accordingly, cannot accurately judge the position of guiding valve.
Three, spool position feedback assembly is installed. This needs additionally to increase hardware, and cost is higher.
Summary of the invention
For above-mentioned the deficiencies in the prior art, it is an object of the invention to provide a kind of defining method without section formula spiral-lobe compressor load per-cent. It does not need to increase unit additional cost can judge compressor load per-cent, thus improves compressor work-ing life, has that method is simple, result feature accurately.
In order to reach foregoing invention object, the technical scheme of the present invention realizes as follows:
Without a defining method for section formula spiral-lobe compressor load per-cent, its method steps is:
1) the type selecting software provided by compressor producer inquires compressor current value corresponding when press load per-cent is 25%-100% under cooling condition and heating condition respectively, calculates and lists percentage of current X and the mapping table of compressor load per-cent Y;
2) by percentage of current X and compressor load per-cent Y mapping table, simulate the corresponding formula of compressor X and Y under cooling condition and heating condition respectively, determine compressor load per-cent Y in real time.
In above-mentioned defining method, when the operation condition making heat or refrigeration changes, carry out compressor full load current value upgrading in real time and revise.
The present invention, owing to have employed aforesaid method, does not need to increase unit additional cost, even if when oil pressure difference is inadequate, still can accurately judge the load per-cent of unit. The inventive method is simple, result is accurate, it is possible to greatly improve the work-ing life of compressor, and what be applicable to all use guiding valves adjusts compressor without Duan Shirong.
Below in conjunction with embodiment, the invention will be further described.
Embodiment
The present invention without the determination method steps of section formula spiral-lobe compressor load per-cent is:
1) the type selecting software provided by compressor producer inquires compressor current value corresponding when press load per-cent is 25%-100% under cooling condition and heating condition respectively, calculates and lists percentage of current X and the mapping table of compressor load per-cent Y;
2) by percentage of current X and compressor load per-cent Y mapping table, simulate the corresponding formula of compressor X and Y under cooling condition and heating condition respectively, determine compressor load per-cent Y in real time.
In aforesaid method step, when the operation condition making heat or refrigeration changes, carry out compressor full load current value upgrading in real time and revise.
For the model of certain producer as RC2-1520 compressor, the concrete operation method of the present invention is described. Other model compressor operation methods are identical with this.
1, with condensing temperature CT=35 DEG C under cooling condition, vaporization temperature ET=4.6 DEG C is design condition, as shown in table 1 below;
Obtain the matched curve between compressor load per-cent Y and percentage of current X: Y=1.45X-45
Table 1
2, with condensing temperature CT=50 DEG C under heating condition, vaporization temperature ET=2.6 DEG C is design condition, as shown in table 2 below;
Obtain the matched curve between press load per-cent Y and percentage of current X: Y=2.07X-107
Table 2.
Claims (2)
1., without a defining method for section formula spiral-lobe compressor load per-cent, its method steps is:
1) the type selecting software provided by compressor producer inquires compressor current value corresponding when press load per-cent is 25%-100% under cooling condition and heating condition respectively, calculates and lists percentage of current X and the mapping table of compressor load per-cent Y;
2) by percentage of current X and compressor load per-cent Y mapping table, simulate the corresponding formula of compressor X and Y under cooling condition and heating condition respectively, determine compressor load per-cent Y in real time.
2. the defining method without section formula spiral-lobe compressor load per-cent according to claim 1, it is characterised in that, when the operation condition making heat or refrigeration changes, carry out compressor full load current value upgrading in real time and revise.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410635432.XA CN105649988A (en) | 2014-11-13 | 2014-11-13 | Determination method for load percentage of stepless screw compressor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410635432.XA CN105649988A (en) | 2014-11-13 | 2014-11-13 | Determination method for load percentage of stepless screw compressor |
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| CN105649988A true CN105649988A (en) | 2016-06-08 |
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| CN201410635432.XA Pending CN105649988A (en) | 2014-11-13 | 2014-11-13 | Determination method for load percentage of stepless screw compressor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107476981A (en) * | 2017-10-16 | 2017-12-15 | 珠海格力电器股份有限公司 | Helical-lobe compressor energy level adjusting method |
| CN108731323A (en) * | 2018-06-15 | 2018-11-02 | 重庆美的通用制冷设备有限公司 | Load Calculation Method, system and the handpiece Water Chilling Units of handpiece Water Chilling Units |
| CN112594187A (en) * | 2020-12-31 | 2021-04-02 | 青岛海信日立空调系统有限公司 | Screw unit control system and screw unit |
| CN113761690A (en) * | 2021-09-23 | 2021-12-07 | 顿汉布什(中国)工业有限公司 | Screw compressor performance simulation calculation method |
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| US20110008181A1 (en) * | 2004-04-30 | 2011-01-13 | Computer Process Controls, Inc. | Fixed and variable compressor system capacity control |
| CN101957041A (en) * | 2010-08-23 | 2011-01-26 | 张铭联 | Safe and energy-saving operation method for central air conditioner |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107476981A (en) * | 2017-10-16 | 2017-12-15 | 珠海格力电器股份有限公司 | Helical-lobe compressor energy level adjusting method |
| CN107476981B (en) * | 2017-10-16 | 2019-02-05 | 珠海格力电器股份有限公司 | Helical-lobe compressor energy level adjusting method |
| CN108731323A (en) * | 2018-06-15 | 2018-11-02 | 重庆美的通用制冷设备有限公司 | Load Calculation Method, system and the handpiece Water Chilling Units of handpiece Water Chilling Units |
| CN112594187A (en) * | 2020-12-31 | 2021-04-02 | 青岛海信日立空调系统有限公司 | Screw unit control system and screw unit |
| CN113761690A (en) * | 2021-09-23 | 2021-12-07 | 顿汉布什(中国)工业有限公司 | Screw compressor performance simulation calculation method |
| CN113761690B (en) * | 2021-09-23 | 2024-03-19 | 顿汉布什(中国)工业有限公司 | Screw compressor performance simulation calculation method |
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Application publication date: 20160608 |