CN105091444A - Method for confirming maximum protective current of variable refrigerant flow system of inverter compressor - Google Patents
Method for confirming maximum protective current of variable refrigerant flow system of inverter compressor Download PDFInfo
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- CN105091444A CN105091444A CN201510546803.1A CN201510546803A CN105091444A CN 105091444 A CN105091444 A CN 105091444A CN 201510546803 A CN201510546803 A CN 201510546803A CN 105091444 A CN105091444 A CN 105091444A
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- changeable compressor
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- inverter compressor
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Abstract
The invention provides a method for confirming the maximum protective current of a variable refrigerant flow system of an inverter compressor. The method includes the following steps that a, in a high-temperature environment, an inverter compressor in an outdoor unit operates under the full load, and the overload current of the variable refrigerant flow system of the inverter compressor is measured; b, an adaptive frequency converter is selected according to the maximum power of the inverter compressor and the maximum borne current of the frequency converter is confirmed; c, a value range of the maximum protective current of the variable refrigerant flow system of the inverter compressor is obtained through calculation; and d, an intermediate value is selected as the maximum protective current of the variable refrigerant flow system of the inverter compressor. The method has the beneficial effects that the maximum protective current of the variable refrigerant flow system of the inverter compressor can be given rapidly and reasonably, a motor of the inverter compressor cannot be demagnetized, the rotation speed of the inverter compressor cannot be reduced, and the refrigerating or heating effect of the variable refrigerant flow system of the inverter compressor can be effectively guaranteed.
Description
Technical field
The present invention relates to multi-connected machine, is specifically a kind of confirmation method of frequency-changeable compressor multiple on-line system maximum protection electric current.
Background technology
VRF Air Conditioning System is called for short multi-connected machine, it comprises controller, off-premises station, multiple indoor set parallel with one another and connects two refrigerant circulation house stewards of each indoor set and off-premises station, off-premises station is communicated with the multiple indoor sets after parallel connection by two refrigerant circulation house stewards, and controller is electrically connected with off-premises station and multiple indoor set parallel with one another simultaneously.Off-premises station comprises compressor, oil eliminator, four-way change-over valve, outdoor heat exchanger while heating (during refrigeration be condenser be evaporimeter) and gas-liquid separator, compressor outlet is communicated with the entrance of oil eliminator, the outlet of oil eliminator is communicated with the first valve port of four-way change-over valve, four-way change-over valve second valve port is communicated with outdoor heat exchanger one end, one of circulating in house steward is communicated with for the outdoor heat exchanger other end and two refrigerants, and another root refrigerant circulation house steward in two refrigerant circulation house stewards is communicated with four-way change-over valve the 3rd valve port of off-premises station, four-way change-over valve the 4th valve port is connected with the entrance of gas-liquid separator, the outlet of gas-liquid separator is communicated with suction port of compressor.Each indoor set comprises electric expansion valve and indoor heat exchanger while heating (during refrigeration be evaporimeter be condenser), one end of indoor heat exchanger is communicated with one end of electric expansion valve, one that the other end and two refrigerants of electric expansion valve circulate in house steward is communicated with, and the house steward that circulates is communicated with for the other end and two refrigerants another root refrigerant circulated in house steward of indoor heat exchanger.When above-mentioned multi-connected machine is operated in refrigeration mode, the first valve port of four-way change-over valve is communicated with the second valve port, and the 3rd valve port is communicated with the 4th valve port, and namely refrigerant is along compressor, outdoor heat exchanger, indoor heat exchanger, the circulation of this route of compressor; When above-mentioned multi-connected machine is operated in heating mode, the first valve port of four-way change-over valve is communicated with the 3rd valve port, and the second valve port is communicated with the 4th valve port, and refrigerant is along compressor, indoor heat exchanger, outdoor heat exchanger, the circulation of this route of compressor.
Frequency-changeable compressor multiple on-line system not only has splendid comfort and outstanding energy saving, and it can also stable operation in a wide-voltage range, but it is well-known, when power electric is forced down to a certain extent time, electric current will inevitably increase, and when electric current increases to a certain degree, the motor of frequency-changeable compressor will be caused to demagnetize, the motor winding magnetic force of frequency-changeable compressor is reduced greatly, thus the dependability of frequency-changeable compressor can be had a strong impact on, therefore when development and Design frequency-changeable compressor multiple on-line system, generally all need for this Operation system setting protective current is to prevent the generation of above-mentioned situation, but the size of this protective current bad confirmation, if because protective current is excessive, the motor of frequency-changeable compressor will be caused to demagnetize, if and protective current is too small, the rotating speed of frequency-changeable compressor so will be caused to decline, thus greatly affect refrigeration or the heating effect of frequency-changeable compressor multiple on-line system, so confirm that the maximum protection electric current of frequency-changeable compressor multiple on-line system becomes a current technical barrier in the industry.
Summary of the invention
The technical problem that the present invention will solve is, provides a kind of confirmation method of frequency-changeable compressor multiple on-line system maximum protection electric current.
For solving the problems of the technologies described above, technical scheme of the present invention is to provide a kind of confirmation method of frequency-changeable compressor multiple on-line system maximum protection electric current, and it is made up of following steps:
A, the off-premises station of frequency-changeable compressor multiple on-line system is placed in hot environment, and allow the frequency-changeable compressor full load in off-premises station run, then the input voltage of this frequency-changeable compressor is allowed to change within the scope of 165V ~ 264V, and allow system cloud gray model high-pressure maintain between 3.6Mpa ~ 4.2Mpa, monitoring stream is through the real-time current size of frequency-changeable compressor simultaneously, after frequency-changeable compressor is stable, from these current data, select that maximum electric current again, this electric current is the overload electric current of this frequency-changeable compressor multiple on-line system;
B, manufacture this frequency-changeable compressor time, select adaptive frequency converter according to the peak power of this frequency-changeable compressor, and determine that the maximum of this frequency converter bears electric current;
C, by calculating the span of frequency-changeable compressor multiple on-line system maximum protection electric current, this computing formula is:
Im×80％÷1.414≥Ic≥Ie
Wherein, to be that frequency converter is maximum bear electric current to Im, and Ic is the maximum protection electric current of frequency-changeable compressor multiple on-line system, and Ie is the overload electric current of frequency-changeable compressor multiple on-line system;
D, finally from the span of the frequency-changeable compressor multiple on-line system maximum protection electric current calculated, choose the maximum protection electric current of that middle numerical value as frequency-changeable compressor multiple on-line system.
The confirmation method of frequency-changeable compressor multiple on-line system maximum protection electric current of the present invention, wherein, the hot environment mentioned in step a refers to that environment temperature is the environment of more than 43 DEG C or 43 DEG C.
The confirmation method of frequency-changeable compressor multiple on-line system maximum protection electric current of the present invention, wherein, the hot environment mentioned in step a refers to that environment temperature is the environment of 43 DEG C.
After adopting above method, compared with prior art, the intelligent defrosting method of multi-connected machine of the present invention has the following advantages: the confirmation method of frequency-changeable compressor multiple on-line system maximum protection electric current of the present invention reasonably can provide suitable frequency-changeable compressor multiple on-line system maximum protection electric current fast, thus make frequency-changeable compressor multiple on-line system under the prerequisite guaranteeing stable operation under a Width funtion, the motor of frequency-changeable compressor not only can not be caused to demagnetize, nor the rotating speed of frequency-changeable compressor can be caused to decline, and then effectively can ensure refrigeration or the heating effect of frequency-changeable compressor multiple on-line system.
Detailed description of the invention
Be described in further detail below in conjunction with the confirmation method of detailed description of the invention to frequency-changeable compressor multiple on-line system maximum protection electric current of the present invention.
In this detailed description of the invention, the confirmation method of frequency-changeable compressor multiple on-line system maximum protection electric current of the present invention is made up of following steps:
A, the off-premises station of frequency-changeable compressor multiple on-line system is placed in the hot environment of 43 DEG C, and allow the frequency-changeable compressor full load in off-premises station run, then the input voltage of this frequency-changeable compressor is allowed to change within the scope of 165V ~ 264V, and allow system cloud gray model high-pressure maintain between 3.6Mpa ~ 4.2Mpa, monitoring stream is through the real-time current size of frequency-changeable compressor simultaneously, after frequency-changeable compressor is stable, from these current data, select that maximum electric current again, this electric current is the overload electric current of this frequency-changeable compressor multiple on-line system;
B, manufacture this frequency-changeable compressor time, select adaptive frequency converter according to the peak power of this frequency-changeable compressor, and determine that this frequency converter is maximum and bear electric current;
C, by calculating the span of frequency-changeable compressor multiple on-line system maximum protection electric current, this computing formula is:
Im×80％÷1.414≥Ic≥Ie
Wherein, to be that frequency converter is maximum bear electric current to Im, and Ic is the maximum protection electric current of frequency-changeable compressor multiple on-line system, and Ie is the overload electric current of frequency-changeable compressor multiple on-line system;
D, finally from the span of the frequency-changeable compressor multiple on-line system maximum protection electric current calculated, choose the maximum protection electric current of that middle numerical value as frequency-changeable compressor multiple on-line system; such as Im=56A; Ie=35A; so the span of Ic just should between 31.68A ~ 35A; the value of final selection Ic is the median of 31.68A ~ 35A; i.e. 33.34A; as run into numerical precision problem; when maximum protection electric current is set; equipment can only be accurate to a position, so can determine last maximum protection current values according to rounding-off method.
The system cloud gray model high-pressure mentioned in the present invention is the pressure at expulsion of frequency-changeable compressor exhaust ports, the high-pressure pressure sensor that it can carry by frequency-changeable compressor multiple on-line system records, and the operation of frequency-changeable compressor full load and frequency-changeable compressor full-load run, these are existing routine techniques, therefore do not repeat at this; In addition, components and parts for doing the frequency-changeable compressor of testing used in step a are all necessary for qualified products, this is to make this frequency-changeable compressor in experimentation, the temperature rise of its components and parts used all can in rational normal range (NR), thus ensure that this frequency-changeable compressor can all-the-time stable reliability service in whole experimentation, and then make the overload electric current measuring the frequency-changeable compressor multiple on-line system come more accurate; Further, because frequency converter is existing routine techniques, as long as therefore have selected certain a frequency converter in step b, just directly can obtain all parameter informations of this frequency converter, comprise the maximum of this frequency converter and bear electric current.
Above embodiment is only be described the preferred embodiment of the present invention; not scope of the present invention is limited; under not departing from the present invention and designing the prerequisite of spirit; the various distortion that those of ordinary skill in the art make technical scheme of the present invention and improvement, all should fall in protection domain that claims of the present invention determines.
Claims (3)
1. a confirmation method for frequency-changeable compressor multiple on-line system maximum protection electric current, is characterized in that: it is made up of following steps:
A, the off-premises station of frequency-changeable compressor multiple on-line system is placed in hot environment, and allow the frequency-changeable compressor full load in off-premises station run, then the input voltage of this frequency-changeable compressor is allowed to change within the scope of 165V ~ 264V, and allow system cloud gray model high-pressure maintain between 3.6Mpa ~ 4.2Mpa, monitoring stream is through the real-time current size of frequency-changeable compressor simultaneously, after frequency-changeable compressor is stable, from these current data, select that maximum electric current again, this electric current is the overload electric current of this frequency-changeable compressor multiple on-line system;
B, manufacture this frequency-changeable compressor time, select adaptive frequency converter according to the peak power of this frequency-changeable compressor, and determine that this frequency converter is maximum and bear electric current;
C, by calculating the span of frequency-changeable compressor multiple on-line system maximum protection electric current, this computing formula is:
Im×80％÷1.414≥Ic≥Ie
Wherein, to be that frequency converter is maximum bear electric current to Im, and Ic is the maximum protection electric current of frequency-changeable compressor multiple on-line system, and Ie is the overload electric current of frequency-changeable compressor multiple on-line system;
D, finally from the span of the frequency-changeable compressor multiple on-line system maximum protection electric current calculated, choose the maximum protection electric current of that middle numerical value as frequency-changeable compressor multiple on-line system.
2. the confirmation method of frequency-changeable compressor multiple on-line system maximum protection electric current according to claim 1, is characterized in that: the hot environment mentioned in step a refers to that environment temperature is the hot environment of 40 DEG C ~ 45 DEG C.
3. the confirmation method of frequency-changeable compressor multiple on-line system maximum protection electric current according to claim 2, is characterized in that: the hot environment mentioned in step a refers to that environment temperature is the hot environment of 43 DEG C.
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| CN201510546803.1A CN105091444B (en) | 2015-08-31 | 2015-08-31 | The confirmation method of frequency-changeable compressor multi-line system maximum protection electric current |
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| CN201510546803.1A CN105091444B (en) | 2015-08-31 | 2015-08-31 | The confirmation method of frequency-changeable compressor multi-line system maximum protection electric current |
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| CN105091444B CN105091444B (en) | 2018-05-08 |
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Citations (5)
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|---|---|---|---|---|
| DE2349094A1 (en) * | 1973-09-29 | 1975-04-03 | Owens Illinois Inc | Control for electrically driven centrifugal compressors - prevents pumping of the compressor when the motor current exceeds a max. value |
| EP1351029A2 (en) * | 2002-04-03 | 2003-10-08 | Linde Aktiengesellschaft | Method for controlling a set of compressors |
| CN102969957A (en) * | 2012-11-19 | 2013-03-13 | 海尔集团公司 | Starting control method and control device of direct-current variable frequency air-conditioning compressor |
| CN103078296A (en) * | 2013-01-25 | 2013-05-01 | 广东志高暖通设备股份有限公司 | Current detection control circuit for direct current bus |
| CN104426448A (en) * | 2013-08-21 | 2015-03-18 | 广东美的制冷设备有限公司 | Control parameter self-setting method for compressor |
-
2015
- 2015-08-31 CN CN201510546803.1A patent/CN105091444B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2349094A1 (en) * | 1973-09-29 | 1975-04-03 | Owens Illinois Inc | Control for electrically driven centrifugal compressors - prevents pumping of the compressor when the motor current exceeds a max. value |
| EP1351029A2 (en) * | 2002-04-03 | 2003-10-08 | Linde Aktiengesellschaft | Method for controlling a set of compressors |
| CN102969957A (en) * | 2012-11-19 | 2013-03-13 | 海尔集团公司 | Starting control method and control device of direct-current variable frequency air-conditioning compressor |
| CN103078296A (en) * | 2013-01-25 | 2013-05-01 | 广东志高暖通设备股份有限公司 | Current detection control circuit for direct current bus |
| CN104426448A (en) * | 2013-08-21 | 2015-03-18 | 广东美的制冷设备有限公司 | Control parameter self-setting method for compressor |
Non-Patent Citations (1)
| Title |
|---|
| 冯利峰等: ""变频空调器保护点设计的可靠性试验研究"", 《制冷与空调》 * |
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Address after: 315191 Zhejiang city of Ningbo province Jiangshan town Yinzhou District Mingguang Road No. 1166 Applicant after: NINGBO AUX ELECTRIC CO., LTD. Address before: 315191 Zhejiang city of Ningbo province Jiangshan town Yinzhou District Mingguang Road No. 1166 Applicant before: Ningbo AUX Electric Co., Ltd. |
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