CN102331125B - Oil return control method during high-temperature refrigeration of direct current variable frequency multi-unit machine - Google Patents
Oil return control method during high-temperature refrigeration of direct current variable frequency multi-unit machine Download PDFInfo
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- CN102331125B CN102331125B CN 201110145138 CN201110145138A CN102331125B CN 102331125 B CN102331125 B CN 102331125B CN 201110145138 CN201110145138 CN 201110145138 CN 201110145138 A CN201110145138 A CN 201110145138A CN 102331125 B CN102331125 B CN 102331125B
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Abstract
The invention provides an oil return control method during high-temperature refrigeration of a direct current variable frequency multi-unit machine. The method comprises the following steps of: (1) initializing parameters; (2) when a system operates for the time which is greater than or equal to Tb from previous oil return, and Fb is less than or equal to Fx, making that Fb is equal to Fx and operation time T is equal to Ty; and if frequency reduction protection is not available in the operation time T of the system, finishing the oil return; (3) if the frequency reduction protection is available in the system, recording the time Tf for the system to operate at the current frequency and calculating unfinished time T-Tf; (4) making that Fb is equal to Fb-f and operation time T is equal to 2(T-Tf); then if the frequency reduction protection is not available during operation time T of the system, finishing the oil return, and if the frequency reduction protection is available in the system, returning to the step (3) until the current operation frequency Fb is reduced to the minimum frequency Fmin for the operation of the compressor. By adopting the oil return control method, the compressor is not burnt down, the system is not damaged, and high reliability is guaranteed.
Description
Technical field
The present invention relates to DC frequency-changing multi-online air-conditioning system technical field, the method for controlling oil return when specifically being the multi-joint machine high temperature of a kind of DC frequency-changing refrigeration.
Background technology
Present DC frequency-changing multi-online air-conditioning system (refers generally to environment temperature more than 40 ° in the high temperature refrigeration; as Africa) time; because system pressure height; press delivery temperature height; electric current is big, and for guaranteeing the normal operation of system, the DC frequency-changing multi-online air-conditioning system has excessive discharge temperature frequency reducing protection; overcurrent frequency reducing protection, frequency reducing protections such as the too high frequency reducing protection of condenser middle part temperature are guaranteed the normal of system.Whole system all was in lower frequency and moves when this just made the high temperature refrigerating operaton, when the compressor low-frequency operation, just make be discharged in the compressor in oil in the machine pipeline can't bring back to compressor.The oil return of air-conditioning control generally is to be generally more than 60% of maximum frequency of operation at higher frequency Fx() down operation regular time T(T determined that by experiment different system and press T also can different 2min-5min) finish oil return.But in high temperature when refrigeration, is because the frequency reducing protection of system and can't make compressor high frequency operation under oil return frequency Fx; this is the feasible effect that does not play oil return just; thereby cause burning out compressor; if and the frequency reducing protection that has shielded system during the oil return of high temperature refrigeration guarantees oil return, then may cause the damage of whole system.
Summary of the invention
The present invention is directed to the above-mentioned deficiency of prior art, a kind of damage that compressor can not cause system again that neither can burn out is provided, the method for controlling oil return during the multi-joint machine high temperature refrigeration of the DC frequency-changing that reliability is high.
In order to solve the problems of the technologies described above, the method for controlling oil return when technical scheme of the present invention provides the multi-joint machine high temperature refrigeration of a kind of DC frequency-changing, it may further comprise the steps:
(1), parameter initialization: the self-defined oil return frequency Fx of system, oil return Tb blanking time, oil return running time T y, current running frequency Fb;
(2), judge whether system needs oil return: as system's range ability oil return last time time 〉=Tb, during and Fb≤Fx, then make Fb=Fx, running time T=Ty, after this, if unprotect frequency reducing in the operation T of the system time course, then oil return finishes;
(3) if the time T f that recording system moves is then counted in the system protection frequency reducing under current frequency, and between calculating imperfect tense: T-Tf;
(4), system's frequency reducing operation: system reduces the operation of f frequency: make Fb=Fb-f; running time T=2 (T-Tf); if described f is the frequency reducing parameter, by default, after this in the operation T of the system time course; system does not protect then oil return end of frequency reducing again; if the system protection frequency reducing is then returned step (3), when current running frequency Fb drops to the low-limit frequency Fmin of compressor operating; close compressor withdraws from oil return.
Adopt method of the present invention to have the following advantages:
When system's frequency reducing was protected when the present invention was freezed at the multi-joint machine high temperature of DC frequency-changing; prolong system and be lower than the oil return running time of setting under the oil return frequency; make oil return under lower frequency, still can finish; oil can't be got back to compressor and the problem of the burning compressor that produces when having solved the multi-joint machine high temperature refrigeration of DC frequency-changing fully; and when being freezed, the multi-joint machine high temperature of DC frequency-changing carries out the frequency reducing protection of system; the reliability of the oil return of compressor in the time of namely can guaranteeing the high temperature refrigeration; guaranteed the reliability of whole air-conditioning system implementation frequency reducing protection again; neither can burn out the damage that compressor can not cause system again, the reliability height.
The specific embodiment
The present invention is further detailed explanation below in conjunction with the specific embodiment.
Method for controlling oil return when the invention provides the multi-joint machine high temperature of a kind of DC frequency-changing refrigeration, it may further comprise the steps:
(1), parameter initialization: the self-defined oil return frequency Fx of system, oil return Tb blanking time, oil return running time T y, current running frequency Fb; Oil return frequency Fx and oil return running time T y are determined by experiment or are provided by compressor producer according to concrete multi-joint machine system.Adopting oil return frequency Fx in the present embodiment is 72Hz, oil return running time T y=3 minute, and oil return blanking time is the blanking time of each oil return, in the present embodiment Tb=3 hour;
(2), judge whether system needs oil return: as system's range ability oil return last time time 〉=Tb, and during Fb≤Fx, then make Fb=Fx, even the frequency of system rises to Fx, i.e. 72Hz, running time T=Ty, namely 3 minutes, after this, if unprotect frequency reducing in 3 minutes the process of system's operation, then oil return finishes;
(3) if the system protection frequency reducing, then count the time T f that recording system moves under current frequency, i.e. the running time of system under 72Hz, as 1 minute, and between calculating imperfect tense: T-Tf is 2 minutes as calculated;
(4), system's frequency reducing operation: system reduces the operation of f frequency: make Fb=Fb-f; running time T=2 (T-Tf); described f is the frequency reducing parameter; by default; f=10Hz in the present embodiment; then the current frequency Fb after system's frequency reducing is 62Hz; running time T is 4 minutes; after this if in the operation T of the system time course, system does not protect then oil return end of frequency reducing again, if the system protection frequency reducing; then return step (3); when current running frequency Fb dropped to the low-limit frequency Fmin of compressor operating, close compressor withdrawed from oil return.
System there is not frequency reducing in 4 minutes the process if system moves under 62Hz; then oil return finishes; if system's frequency reducing again; then record the running time under the current frequency, if 1.5 minutes, then this is 2.5 minutes imperfect tense; be that 2*2.5 is 5 minutes the running time of then descending the subsystem frequency reducing to drop under the 52Hz; namely protected the frequency reducing protection of system this moment, prolonged the oil return running time of system under lower frequency again, thereby reached oil return effect reliably.The low-limit frequency Fmin of compressor operating is that compressor manufacturer or air-conditioning manufacturer set.
Claims (1)
1. the method for controlling oil return when the multi-joint machine high temperature of DC frequency-changing freezes, it is characterized in that: it may further comprise the steps:
(1), parameter initialization: the self-defined oil return frequency Fx of system, oil return Tb blanking time, oil return running time T y, current running frequency Fb;
(2), judge whether system needs oil return: as system's range ability oil return last time time 〉=Tb, during and Fb≤Fx, then make Fb=Fx, running time T=Ty, after this, if unprotect frequency reducing in the operation T of the system time course, then oil return finishes;
(3) if the time T f that recording system moves is then counted in the system protection frequency reducing under current frequency, and between calculating imperfect tense: T-Tf;
(4), system's frequency reducing operation: system reduces the operation of f frequency: make Fb=Fb-f; running time T=2 (T-Tf); if described f is the frequency reducing parameter, by default, after this in the operation T of the system time course; system does not protect then oil return end of frequency reducing again; if the system protection frequency reducing is then returned step (3), when current running frequency Fb drops to the low-limit frequency Fmin of compressor operating; close compressor withdraws from oil return.
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| CN 201110145138 CN102331125B (en) | 2011-05-24 | 2011-05-24 | Oil return control method during high-temperature refrigeration of direct current variable frequency multi-unit machine |
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| CN 201110145138 CN102331125B (en) | 2011-05-24 | 2011-05-24 | Oil return control method during high-temperature refrigeration of direct current variable frequency multi-unit machine |
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| CN102331125B true CN102331125B (en) | 2013-08-07 |
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Cited By (1)
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| CN103486785A (en) * | 2013-09-18 | 2014-01-01 | Tcl空调器(中山)有限公司 | Oil return control method and device of variable-frequency air-conditioner compressor |
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| CN102650485B (en) * | 2012-04-18 | 2015-04-22 | Tcl空调器(中山)有限公司 | Frequency-conversion multi-online system and control method of lubricating oil of compressor thereof |
| CN104121174A (en) * | 2013-04-25 | 2014-10-29 | 珠海格力电器股份有限公司 | Compressor running control method and control system and refrigeration cycle system |
| CN104180563B (en) * | 2013-05-27 | 2017-06-20 | 珠海格力电器股份有限公司 | Oil return method when multiple on-line system is heated |
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| CN106322868B (en) * | 2015-06-24 | 2020-11-13 | 博世热力技术（上海）有限公司 | Air conditioner refrigeration system and oil return control method thereof |
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| CN111397176B (en) * | 2020-03-17 | 2021-03-12 | 珠海格力电器股份有限公司 | High-temperature refrigeration control method and device and air conditioning equipment |
| CN111998499A (en) * | 2020-09-03 | 2020-11-27 | 宁波奥克斯电气股份有限公司 | Oil return control method and device, air conditioner and storage medium |
| CN115978738B (en) * | 2022-12-13 | 2024-05-10 | 珠海格力电器股份有限公司 | Oil return control method and air conditioning system |
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Address after: 315191 Zhejiang city of Ningbo province Jiangshan town Yinzhou District Mingguang Road No. 1166 Patentee after: NINGBO AUX ELECTRIC CO., LTD. Address before: 315191 Zhejiang city of Ningbo province Jiangshan town Yinzhou District Mingguang Road No. 1166 Patentee before: Ningbo AUX Electric Co., Ltd. |