CN101968248B - Control method for oil return of DC inverter compressor - Google Patents
Control method for oil return of DC inverter compressor Download PDFInfo
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- CN101968248B CN101968248B CN201010270212A CN201010270212A CN101968248B CN 101968248 B CN101968248 B CN 101968248B CN 201010270212 A CN201010270212 A CN 201010270212A CN 201010270212 A CN201010270212 A CN 201010270212A CN 101968248 B CN101968248 B CN 101968248B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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Abstract
The invention discloses a control method for oil return of a DC inverter compressor, which comprises the following steps of: (1) initially supplying power to start the machine, and setting the opening of an electronic expansion valve according to the number of the started indoor units; (2) adopting different upconvert methods according to the target frequency of the compressor; (3) if an air conditioning unit starts for 10 minutes, starting oil return circulation; and (4) after oil return, if the machine is in a heating mode, judging whether the temperature of an outdoor coil is less than or equal to -12DEG C, if so, beginning defrosting circulation, and starting a conventional automatic adjustment mode after defrosting, otherwise, starting the conventional automatic adjustment mode, and if the machine is not in the heating mode, directly starting the conventional automatic adjustment mode; and (5) when a stop command is received, adopting different stop modes according to different operating frequencies of the compressor. Compared with the conventional methods, the method has the characteristic of effectively solving the problem of oil starvation in the starting process, normally running process and stopping process of the compressor.
Description
Technical field:
The present invention relates to a kind of control method of DC frequency-changeable compressor oil return, particularly relate to a kind of control method of DC frequency-changeable compressor oil return of the VRV of being used for air-conditioning system.
Background technology:
VRV air-conditioning system full name is Varied Refrigerant Volume; Be called for short VRV; It is a kind of variable refrigerant volume air-conditioning system; It is pumped (conveying) medium with the cold-producing medium, and outdoor main frame is made up of outdoor heat exchanger, compressor and other refrigeration part, the indoor indoor set of then being made up of direct evaporating heat exchanger, throttling arrangement and blower fan.An off-premises station can be to several indoor set refrigerant conveying liquid through pipeline.Refrigerant flow through each heat exchanger in circulating mass of refrigerant and the inlet chamber of control compressor; Can satisfy indoor hot and cold burden requirement VRV system in real time and have plurality of advantages such as energy-conservation, comfortable, that running is steady; But and each room independent regulation, can satisfy the demand of the different air conditioner loads of chummery not.Its operation principle is: by the state parameter of control system acquisition indoor comfort parameter, outdoor environment parameter and sign refrigeration system operation conditions; According to running Optimization criterion and human body comfort criterion; Regulate the compressor displacement through means such as frequency conversions; And all controllable component such as fan, electric expansion valve of control air-conditioning system, guarantee the comfortableness of indoor environment, and make the air-conditioning system steady operation in optimum Working.The VRV air-conditioning system has that design and installation is convenient, flexible arrangement is changeable, space is little, easy to use, reliability is high, operating cost is low, do not need advantages such as machine room, no water system; Be widely used in places such as apartment, villa, bank, supermarket, amusement; The applied environment temperature range is broad; Normally freeze refrigeration or heating operation as usual during minimum temperature-15 ℃ during 52 ℃ of maximum temperatures.But in the prior art DC frequency-changing VRV air-conditioning system running, there is following defective in the control method of DC frequency-changeable compressor oil return:
1. DC frequency-changing VRV air-conditioning system is in running, and owing to the sudden change of indoor load, indoor load is loaded from 20% sudden load change to 100% sometimes.At this moment, the DC frequency-changeable compressor running frequency sharply is raised to high frequency from low frequency suddenly, and this lubricating oil that will take place in the compressor oil sump is dished out from compressor in a large number, causes the compressor oil starvation;
2. in the winter time under outdoor temperature extremely low (below the 15 ℃) condition, if the air conditioner group leader time is shut down the back start, then in a period of time after start, the lubricating oil in the compressor oil sump also can be discharged from compressor, causes the compressor oil starvation;
3. singly open an indoor set after the long-time sleeping down at low temperature (below 2 ℃); If during this indoor set load also lower (below 30%); Because this moment, the aperture of respective electronic expansion valve was arranged on 150 steps or 200 steps; Then the lubricating oil discharge in the compressor of compressor start back is more, and the lubricating oil of getting back in the compressor is less, also can cause the compressor oil starvation;
4. when DC frequency-changing VRV air-conditioning system needed to shut down after indoor temperature reaches design temperature, the compressor operating frequency was directly reduced to zero frequency from high frequency, and this also can cause the compressor oil starvation.
Summary of the invention:
The present invention is directed to above problem a kind of control method that can solve the DC frequency-changeable compressor oil return of the oil starvation problem of compressor in start-up course, normal course of operation and stopping process effectively is provided.
The present invention overcomes the above problems used technical scheme: a kind of control method of DC frequency-changeable compressor oil return may further comprise the steps:
(1), air-conditioning unit initial power-up start; Air-conditioning system judges that indoor set is a unlatching; Still open more than one, if an indoor set is opened, then electronic expansion valve opening is～450 steps of 350 steps; Compressor is behind first oil return platform operation 60s, again at second oil return platform operation 100s; If an above indoor set is opened, then electronic expansion valve opening is～200 steps of 100 steps, and compressor is behind first oil return platform operation 60s, again at second oil return platform operation 100s;
(2), air-conditioning system begins to regulate automatically the running frequency of compressor and the aperture of electric expansion valve according to the situation of indoor set subsequently, if the target frequency of compressor smaller or equal to 70Hz, then compressor directly rises to the target frequency operation; If the target frequency of compressor smaller or equal to 140Hz, after then compressor rises to 70Hz operation 30s earlier, rises to the target frequency operation greater than 70Hz again; If the target frequency of compressor is greater than 140Hz, after then compressor rises to 70Hz operation 30s earlier, rise to 140Hz operation 30s again after, rise to the target frequency operation at last;
(3), the compressor operating frequency gets into conventional automatic adjusting pattern, judges whether the air-conditioning unit has powered on this moment to have moved 10min, if moved 10min, then starts the oil return circulation, oil return 2min～4min; If not, then continue to judge;
(4), after oil return finishes,, judge that then outdoor coil pipe used temperature whether smaller or equal to-12 ℃, is, then get into cycle if air-conditioning system is a heating mode, defrosting 4min～6min, defrosting finishes the back and gets into conventional automatic adjusting pattern; , then do not get into conventional automatic adjusting pattern; If air-conditioning system is not a heating mode, then directly get into conventional automatic adjusting pattern;
(5), when receiving halt command,, the compressor operating frequency gets final product if smaller or equal to 100Hz, then directly shutting down; If the compressor operating frequency greater than 100Hz, after then the compressor operating frequency is reduced to 100Hz operation 30s earlier, is shut down again.
In the process that described step (4) is carried out, if compressor running frequency less than the situation of 50Hz under continuous operation 120min, then carry out the oil return circulation, after oil return finishes, get into conventional automatic adjusting pattern again.
Oil return 3min in the described step (3).
Defrosting 5min in the described step (4).
After adopting above method; The present invention compared with prior art since the startup stage platform number opened according to indoor set different and adopt different electronic expansion valve openings respectively, in the time of can preventing that then the indoor set from opening; Because of the aperture of electric expansion valve not enough; Cause the lubricating oil discharge in the compressor more, the lubricating oil of getting back in the compressor is less, and finally causes the generation of the problem of compressor oil starvation; And after start finishing, the hoisting way of compressor operating frequency is: if the target frequency of compressor smaller or equal to 70Hz, then compressor directly rises to the target frequency operation; If the target frequency of compressor less than 140Hz, after then compressor rises to 70Hz operation 30s earlier, rises to the target frequency operation greater than 70Hz again; If the target frequency of compressor is greater than 140Hz; After then compressor rises to 70Hz operation 30s earlier; After rising to 140Hz operation 30s again, rise to the target frequency operation at last, can prevent effectively that then the compressor operating frequency from sharply rising to high frequency from low frequency suddenly; And the lubricating oil in the compressor oil sump that takes place is dished out from compressor, finally causes the generation of the situation of compressor oil starvation; Moreover the air-conditioning unit power on the operation 10min; Then start oil return circulation, this just can prevent that the air conditioner group leader time from shutting down afterwards and start shooting, in a period of time after start; Lubricating oil in the compressor oil sump also can be got rid of from compressor, and causes the problem of compressor oil starvation; If be exactly in addition the compressor operating frequency whether smaller or equal to 100Hz, then directly shut down and get final product; If the compressor operating frequency greater than 100Hz, after then the compressor operating frequency is reduced to 100Hz operation 30s earlier, is shut down again, in the time of then can preventing to shut down effectively, the compressor operating frequency be directly reduced to zero frequency from high frequency, and the problem of the compressor oil starvation that causes.Therefore the present invention can solve the oil starvation problem of compressor in start-up course, normal course of operation and stopping process effectively.
The specific embodiment:
Below in conjunction with concrete real mode, the present invention done further describing:
Embodiment 1
A kind of control method of DC frequency-changeable compressor oil return may further comprise the steps:
(1), air-conditioning unit initial power-up start; Air-conditioning system judges that indoor set is that an indoor set (0.8HP) is opened; Then electronic expansion valve opening was 350 steps, and compressor is behind the first oil return platform (60Hz) operation 60s, again at second oil return platform (100Hz) operation 100s
(2), air-conditioning system begins to regulate automatically the running frequency of compressor and the aperture of electric expansion valve according to the situation of indoor set subsequently, if the target frequency of compressor smaller or equal to 70Hz, then compressor directly rises to the target frequency operation; If the target frequency of compressor smaller or equal to 140Hz, after then compressor rises to 70Hz operation 30s earlier, rises to the target frequency operation greater than 70Hz again; If the target frequency of compressor is greater than 140Hz, after then compressor rises to 70Hz operation 30s earlier, rise to 140Hz operation 30s again after, rise to the target frequency operation at last;
(3), the compressor operating frequency gets into conventional automatic adjusting pattern, judge whether the air-conditioning unit has powered on this moment to have moved 10min, if moved 10min; Then start the oil return circulation, oil return 3min, concrete oil return process does; During oil return circulation beginning; No matter the compressor operating frequency is what before the oil return, the compressor operating frequency is adjusted to oil return frequency 100Hz, no matter and be the aperture of electric expansion valve of first indoor set of unlatching; Still the aperture of the electric expansion valve of other indoor sets that not have to open is all adjusted to 300 and is gone on foot; Behind the oil return 3min, withdraw from the oil return circulation, compressor operating frequency and electronic expansion valve opening all return to the state before the oil return circulation; If not, then continue to judge;
(4), after oil return finishes,, judge that then whether outdoor coil pipe used temperature is smaller or equal to-12 ℃ if air-conditioning system is a heating mode; Be, then get into cycle, defrosting 5min; Defrosting finishes the back and gets into conventional automatic adjusting pattern, and concrete defrost process does, when cycle begins; Compressor frequency drops to 40Hz earlier, wait four-way change-over valve switching-over after, after the compressor operating frequency rises to the defrosting frequency operation 5min of 120Hz; After four-way change-over valve commutated once more, the compressor operating frequency retrieval was to the preceding running frequency of cycle; Not, then get into conventional automatic adjusting pattern; If air-conditioning system is not a heating mode, then directly get into conventional automatic adjusting pattern;
(5), when receiving halt command,, the compressor operating frequency gets final product if smaller or equal to 100Hz, then directly shutting down; If the compressor operating frequency greater than 100Hz, after then the compressor operating frequency is reduced to 100Hz operation 30s earlier, is shut down again.
In the process that described step (4) is carried out, if compressor running frequency less than the situation of 50Hz under continuous operation 120min, then carry out the oil return circulation, after oil return finishes, get into conventional automatic adjusting pattern again.
Embodiment 2
A kind of control method of DC frequency-changeable compressor oil return may further comprise the steps:
(1), air-conditioning unit initial power-up start; Air-conditioning system judges that indoor set is that an above indoor set is opened; Then electronic expansion valve opening was 120 steps, and compressor is behind the first oil return platform (60Hz) operation 60s, again at second oil return platform (100Hz) operation 100s;
(2), air-conditioning system begins to regulate automatically the running frequency of compressor and the aperture of electric expansion valve according to the situation of indoor set subsequently, if the target frequency of compressor smaller or equal to 70Hz, then compressor directly rises to the target frequency operation; If the target frequency of compressor smaller or equal to 140Hz, after then compressor rises to 70Hz operation 30s earlier, rises to the target frequency operation greater than 70Hz again; If the target frequency of compressor is greater than 140Hz, after then compressor rises to 70Hz operation 30s earlier, rise to 140Hz operation 30s again after, rise to the target frequency operation at last;
(3), the compressor operating frequency gets into conventional automatic adjusting pattern, judge whether the air-conditioning unit has powered on this moment to have moved 10min, if moved 10min; Then start the oil return circulation, oil return 4min, concrete oil return process does; During oil return circulation beginning; No matter the compressor operating frequency is what before the oil return, the compressor operating frequency is adjusted to oil return frequency 100Hz, no matter and be the aperture of electric expansion valve of first indoor set of unlatching; Still the aperture of the electric expansion valve of other indoor sets that not have to open is all adjusted to 300 and is gone on foot; Behind the oil return 4min, withdraw from the oil return circulation, compressor operating frequency and electronic expansion valve opening all return to the state before the oil return circulation; If not, then continue to judge;
(4), after oil return finishes,, judge that then outdoor coil pipe used temperature whether smaller or equal to-12 ℃, is, then get into cycle if air-conditioning system is a heating mode, defrosting 6min, defrosting finishes the back and gets into conventional automatic adjusting pattern; , then do not get into conventional automatic adjusting pattern; If air-conditioning system is not a heating mode, then directly get into conventional automatic adjusting pattern;
(5), when receiving halt command,, the compressor operating frequency gets final product if smaller or equal to 100Hz, then directly shutting down; If the compressor operating frequency greater than 100Hz, after then the compressor operating frequency is reduced to 100Hz operation 30s earlier, is shut down again.
In the process that described step (4) is carried out, if compressor running frequency less than the situation of 50Hz under continuous operation 120min, then carry out the oil return circulation, after oil return finishes, get into conventional automatic adjusting pattern again.
Above embodiment is merely preferred embodiment of the present invention, and the present invention also allows other variation, and when only opening an indoor set, the aperture of electric expansion valve can be 400 steps or 450 steps; When opening many indoor sets, the aperture of electric expansion valve can be 100 steps or 200 steps or the like.
Claims (5)
1. the control method of a DC frequency-changeable compressor oil return is characterized in that: may further comprise the steps:
(1), air-conditioning unit initial power-up start; Air-conditioning system judges that indoor set is a unlatching; Still open more than one, if an indoor set is opened, then electronic expansion valve opening is～450 steps of 350 steps; Compressor is behind first oil return platform operation 60s, again at second oil return platform operation 100s; If an above indoor set is opened, then electronic expansion valve opening is～200 steps of 100 steps, and compressor is behind first oil return platform operation 60s, again at second oil return platform operation 100s;
(2), air-conditioning system begins to regulate automatically the running frequency of compressor and the aperture of electric expansion valve according to the situation of indoor set subsequently, if the target frequency of compressor smaller or equal to 70Hz, then compressor directly rises to the target frequency operation; If the target frequency of compressor smaller or equal to 140Hz, after then compressor rises to 70Hz operation 30s earlier, rises to the target frequency operation greater than 70Hz again; If the target frequency of compressor is greater than 140Hz, after then compressor rises to 70Hz operation 30s earlier, rise to 140Hz operation 30s again after, rise to the target frequency operation at last;
(3), the compressor operating frequency gets into conventional automatic adjusting pattern, judges whether the air-conditioning unit has powered on this moment to have moved 10min, if moved 10min, then starts the oil return circulation, oil return 2min～4min; If not, then continue to judge;
(4), after oil return finishes,, judge that then outdoor coil pipe used temperature whether smaller or equal to-12 ℃, is, then get into cycle if air-conditioning system is a heating mode, defrosting 4min～6min, defrosting finishes the back and gets into conventional automatic adjusting pattern; , then do not get into conventional automatic adjusting pattern; If air-conditioning system is not a heating mode, then directly get into conventional automatic adjusting pattern;
(5), when receiving halt command,, the compressor operating frequency gets final product if smaller or equal to 100Hz, then directly shutting down; If the compressor operating frequency greater than 100Hz, after then the compressor operating frequency is reduced to 100Hz operation 30s earlier, is shut down again.
2. the control method of DC frequency-changeable compressor oil return according to claim 1 is characterized in that: if an indoor set is opened, then electronic expansion valve opening was 350 steps in the step (1); If an above indoor set is opened, then electronic expansion valve opening was 120 steps.
3. the control method of DC frequency-changeable compressor oil return according to claim 1; It is characterized in that: in the process that described step (4) is carried out; If compressor running frequency less than the situation of 50Hz under continuous operation 120min; Then carry out the oil return circulation, after oil return finishes, get into conventional automatic adjusting pattern again.
4. the control method of DC frequency-changeable compressor oil return according to claim 1 is characterized in that: oil return 3min in the described step (3).
5. the control method of DC frequency-changeable compressor oil return according to claim 1 is characterized in that: defrosting 5min in the described step (4).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010270212A CN101968248B (en) | 2010-08-26 | 2010-08-26 | Control method for oil return of DC inverter compressor |
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| CN201010270212A CN101968248B (en) | 2010-08-26 | 2010-08-26 | Control method for oil return of DC inverter compressor |
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| CN101968248B true CN101968248B (en) | 2012-10-17 |
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Address after: 315191 Zhejiang city of Ningbo province Yinzhou District Jiangshan town Light Road No. 1166 Patentee after: NINGBO AUX ELECTRIC CO., LTD. Address before: 315191 Zhejiang city of Ningbo province Yinzhou District Jiangshan town Light Road No. 1166 Patentee before: Ningbo AUX Electric Co., Ltd. |