CN105091444B - The confirmation method of frequency-changeable compressor multi-line system maximum protection electric current - Google Patents
The confirmation method of frequency-changeable compressor multi-line system maximum protection electric current Download PDFInfo
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- CN105091444B CN105091444B CN201510546803.1A CN201510546803A CN105091444B CN 105091444 B CN105091444 B CN 105091444B CN 201510546803 A CN201510546803 A CN 201510546803A CN 105091444 B CN105091444 B CN 105091444B
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Abstract
A kind of confirmation method of frequency-changeable compressor multi-line system maximum protection electric current, it is comprised the steps of：A, in hot environment, and the frequency-changeable compressor full load allowed in outdoor unit runs the overload electric current for measuring frequency-changeable compressor multi-line system；B, the frequency converter of adaptation is selected according to the maximum power of frequency-changeable compressor, and determines that the maximum of the frequency converter bears electric current；C, by the way that the value range of frequency-changeable compressor multi-line system maximum protection electric current is calculated；D, maximum protection electric current of that the most middle numerical value as frequency-changeable compressor multi-line system is chosen.It is an advantage of the invention that：It quickly can reasonably provide suitable frequency-changeable compressor multi-line system maximum protection electric current; so as to not but not cause the motor of frequency-changeable compressor to demagnetize; nor the rotating speed of frequency-changeable compressor can be caused to decline, and then can effectively ensure that the refrigeration or heating effect of frequency-changeable compressor multi-line system.
Description
Technical field
The present invention relates to multi-connected machine, is especially a kind of confirmation side of frequency-changeable compressor multi-line system maximum protection electric current
Method.
Background technology
VRF Air Conditioning System abbreviation multi-connected machine, it include controller, outdoor unit, multiple indoor units parallel with one another and
Connect two refrigerants circulation manifold of each indoor unit and outdoor unit, outdoor unit by two refrigerants circulate manifold with it is in parallel after it is more
The connection of a indoor unit, controller at the same time with outdoor unit and multiple indoor mechatronics parallel with one another.Outdoor unit include compressor,
Oil eliminator, four-way reversing valve, outdoor heat exchanger (being evaporator when being heated during refrigeration for condenser) and gas-liquid separator, pressure
The outlet of contracting machine is connected with the entrance of oil eliminator, and the outlet of oil eliminator is connected with the first valve port of four-way reversing valve, and four-way changes
Connected to the second valve port of valve with outdoor heat exchanger one end, a company in the outdoor heat exchanger other end and two refrigerant circulation manifold
It is logical, and another refrigerant circulation manifold in two refrigerant circulation manifold is connected with the 3rd valve port of four-way reversing valve of outdoor unit,
The entrance of the 4th valve port of four-way reversing valve and gas-liquid separator connects, and the outlet of gas-liquid separator is connected with suction port of compressor.Often
A indoor unit includes electric expansion valve and indoor heat exchanger (being condenser when being heated during refrigeration for evaporator), indoor heat exchanger
One end connected with one end of electric expansion valve, a company in the other end of electric expansion valve and two refrigerants circulation manifold
Logical, the other end of indoor heat exchanger is connected with another refrigerant circulation manifold in two refrigerants circulation manifold.Above-mentioned is multi-joint
When machine is operated in refrigeration mode, the first valve port of four-way reversing valve is connected with the second valve port, and the 3rd valve port is connected with the 4th valve port,
That is refrigerant is along compressor, outdoor heat exchanger, indoor heat exchanger, the circulation of compressor this route；Above-mentioned multi-connected machine is operated in
During heating mode, the first valve port of four-way reversing valve is connected with the 3rd valve port, and the second valve port is connected with the 4th valve port, refrigerant along
This route circulation of compressor, indoor heat exchanger, outdoor heat exchanger, compressor.
Frequency-changeable compressor multi-line system not only has splendid comfort and outstanding energy saving, and it can also
The enough stable operation in a wide-voltage range, it is well known that, when supply voltage it is low to a certain extent when, electric current must
It can so increase, and when electric current increases to a certain extent, the motor demagnetization of frequency-changeable compressor is will result in, makes frequency-changeable compressor
Machine winding magnetic force substantially reduces, so that the use reliability of frequency-changeable compressor can be seriously affected, therefore designs frequency conversion in exploitation
During compressor multi-line system, it is typically necessary and one protective current is set to prevent the generation of the above situation for the system, but
It is the size of this protective current and bad confirmation, if because protective current is excessive, the motor that will result in frequency-changeable compressor moves back
Magnetic, and if protective current is too small, then may result in frequency-changeable compressor rotating speed decline so that it is more to largely effect on frequency-changeable compressor
The refrigeration or heating effect of on-line system, so confirming the maximum protection electric current of frequency-changeable compressor multi-line system becomes mesh
A preceding technical barrier in the industry.
The content of the invention
The invention solves a technical problem be to provide a kind of frequency-changeable compressor multi-line system maximum protection electric current
Confirmation method.
In order to solve the above technical problems, the technical scheme is that provide a kind of frequency-changeable compressor multi-line system maximum
The confirmation method of protective current, it is comprised the steps of：
A, the outdoor unit of frequency-changeable compressor multi-line system is placed in hot environment, and the frequency conversion allowed in outdoor unit is compressed
Machine full load is run, and then allows the input voltage of the frequency-changeable compressor to be changed in the range of 165V~264V, and allows system operation
Between high-pressure maintains 3.6Mpa~4.2Mpa, while monitoring flows through the real-time current size of frequency-changeable compressor, treats frequency conversion
After compressor operating is stablized, then that maximum electric current is selected from these current datas, this electric current is the frequency-changeable compressor
The overload electric current of multi-line system；
B, manufacture the frequency-changeable compressor when, according to the maximum power of the frequency-changeable compressor come select adaptation frequency conversion
Device, and determine that the maximum of the frequency converter bears electric current；
C, by the way that the value range of frequency-changeable compressor multi-line system maximum protection electric current, the calculation formula is calculated
For：
1.414 >=the Ic of ÷ of Im × 80% >=Ie
Wherein, Im bears electric current for frequency converter maximum, and Ic is the maximum protection electric current of frequency-changeable compressor multi-line system, Ie
For the overload electric current of frequency-changeable compressor multi-line system；
D, finally chosen most from the value range for the frequency-changeable compressor multi-line system maximum protection electric current being calculated
Maximum protection electric current of that the middle numerical value as frequency-changeable compressor multi-line system.
The confirmation method of frequency-changeable compressor multi-line system maximum protection electric current of the present invention, wherein, carried in step a
To hot environment refer to that environment temperature is 43 DEG C or more than 43 DEG C of environment.
The confirmation method of frequency-changeable compressor multi-line system maximum protection electric current of the present invention, wherein, carried in step a
To hot environment refer to that environment temperature is 43 DEG C of environment.
After 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 multi-line system maximum protection electric current of the present invention quickly can reasonably provide suitable frequency conversion
Compressor multi-line system maximum protection electric current, so that frequency-changeable compressor multi-line system is guaranteeing in a Width funtion
On the premise of lower stable operation, not but not the motor of frequency-changeable compressor is caused to demagnetize, nor frequency-changeable compressor can be caused
Rotating speed decline, and then can effectively ensure that the refrigeration or heating effect of frequency-changeable compressor multi-line system.
Embodiment
Confirmation side with reference to embodiment to frequency-changeable compressor multi-line system maximum protection electric current of the present invention
Method is described in further detail.
In present embodiment, the confirmation method of frequency-changeable compressor multi-line system maximum protection electric current of the present invention by with
Lower step composition：
A, the outdoor unit of frequency-changeable compressor multi-line system is placed in 43 DEG C of hot environment, and allows the change in outdoor unit
Frequency compressor full load is run, and then allows the input voltage of the frequency-changeable compressor to be changed in the range of 165V~264V, and allow and be
Between system operation high-pressure maintains 3.6Mpa~4.2Mpa, while monitoring flows through the real-time current size of frequency-changeable compressor,
After frequency-changeable compressor is stable, then that maximum electric current is selected from these current datas, this electric current is the frequency conversion
The overload electric current of compressor multi-line system；
B, manufacture the frequency-changeable compressor when, according to the maximum power of the frequency-changeable compressor come select adaptation frequency conversion
Device, and determine that the frequency converter maximum bears electric current；
C, by the way that the value range of frequency-changeable compressor multi-line system maximum protection electric current, the calculation formula is calculated
For：
1.414 >=the Ic of ÷ of Im × 80% >=Ie
Wherein, Im bears electric current for frequency converter maximum, and Ic is the maximum protection electric current of frequency-changeable compressor multi-line system, Ie
For the overload electric current of frequency-changeable compressor multi-line system；
D, finally chosen most from the value range for the frequency-changeable compressor multi-line system maximum protection electric current being calculated
Maximum protection electric current of that the middle numerical value as frequency-changeable compressor multi-line system, such as Im=56A, Ie=35A, then
The value range of Ic just should be between 31.68A~35A, and the value of final choice Ic is the median of 31.68A~35A, i.e.,
33.34A, such as runs into numerical precision problem, and when setting maximum protection electric current, equipment may be only accurate to a position, then can basis
Rounding-off method determines last maximum protection current values.
The system operation high-pressure being previously mentioned in the present invention is the pressure at expulsion of frequency-changeable compressor exhaust ports, it may
The high-pressure pressure sensor carried by frequency-changeable compressor multi-line system measures, and the operation of frequency-changeable compressor full load is frequency conversion
Compressor full-load run, these are existing conventional techniques, therefore are not repeated herein；In addition, it is used to do the change tested in step a
The component of frequency compressors is necessary for qualified products, this is its institute in order to make the frequency-changeable compressor in experimentation
Can be in rational normal range (NR), so as to ensure that the frequency-changeable compressor in the entire experiment process can with the temperature rise of component
Enough all-the-time stable reliability services, and then make the overload electric current for measuring the frequency-changeable compressor multi-line system come more accurate；Also
Have, since frequency converter is existing conventional techniques, as long as have selected certain a frequency converter in step b, it is possible to directly obtain
All parameter informations of the frequency converter, including the maximum of the frequency converter are taken to bear electric current.
More than embodiment be only the preferred embodiment of the present invention is described, not to the scope of the present invention into
Row limits, and on the premise of design spirit of the present invention is not departed from, those of ordinary skill in the art make technical scheme
The various modifications gone out and improvement, should all fall into the protection domain that claims of the present invention determines.
Claims (3)
- A kind of 1. confirmation method of frequency-changeable compressor multi-line system maximum protection electric current, it is characterised in that：It is by following steps Composition：A, the outdoor unit of frequency-changeable compressor multi-line system is placed in hot environment, and makes the frequency-changeable compressor in outdoor unit complete Load operation, then allows the input voltage of the frequency-changeable compressor to be changed in the range of 165V~264V, and allows system operation high pressure Between pressure maintains 3.6Mpa~4.2Mpa, while monitoring flows through the real-time current size of frequency-changeable compressor, treats that frequency conversion is compressed After machine is stable, then that maximum electric current is selected from these current datas, this electric current is that the frequency-changeable compressor is multi-joint The overload electric current of machine system；B, manufacture the frequency-changeable compressor when, according to the maximum power of the frequency-changeable compressor come select adaptation frequency converter, and Determine that the frequency converter maximum bears electric current；C, by the way that the value range of frequency-changeable compressor multi-line system maximum protection electric current is calculated, which is：1.414 >=the Ic of ÷ of Im × 80% >=IeWherein, Im bears electric current for frequency converter maximum, and Ic is the maximum protection electric current of frequency-changeable compressor multi-line system, and Ie is change The overload electric current of frequency compressor multi-line system；D, finally chosen from the value range for the frequency-changeable compressor multi-line system maximum protection electric current being calculated most middle Maximum protection electric current of that numerical value as frequency-changeable compressor multi-line system.
- 2. the confirmation method of frequency-changeable compressor multi-line system maximum protection electric current according to claim 1, its feature exist In：The hot environment mentioned in step a refers to the hot environment that environment temperature is 40 DEG C~45 DEG C.
- 3. the confirmation method of frequency-changeable compressor multi-line system maximum protection electric current according to claim 2, its feature exist In：The hot environment mentioned in step a refers to the hot environment that environment temperature is 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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| CN105091444B true 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 |
|---|
| "变频空调器保护点设计的可靠性试验研究";冯利峰等;《制冷与空调》;20090630;第9卷(第3期);第63页 * |
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| CN105091444A (en) | 2015-11-25 |
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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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