CN102566456A - Air cooling screw chiller, oil return control method and device therefor - Google Patents
Air cooling screw chiller, oil return control method and device therefor Download PDFInfo
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- CN102566456A CN102566456A CN2010106124866A CN201010612486A CN102566456A CN 102566456 A CN102566456 A CN 102566456A CN 2010106124866 A CN2010106124866 A CN 2010106124866A CN 201010612486 A CN201010612486 A CN 201010612486A CN 102566456 A CN102566456 A CN 102566456A
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Abstract
The invention discloses an air cooling screw chiller, an oil return control method and an oil return control device therefor. The oil return control method comprises the following steps: a chiller is started; a motherboard judges whether the chiller operates completely, wherein the motherboard controls the chiller to carry out loading/unloading operations according to loads when the motherboard determines that the chiller operates completely; the motherboard judges whether a low oil level switch of a compressor is switched off when the motherboard determines that the chiller doesn't operate completely; the motherboard controls the chiller to return oil when the motherboard detects that the low oil level switch of the compressor is switched off; and the motherboard controls the chiller to exit an oil return operation when the motherboard detects that a high oil level switch of the compressor is switched on. According to the oil return control method, the oil return control device and the air cooling screw chiller, disclosed by the invention, the service life of the compressor can be prolonged.
Description
Technical field
The present invention relates to refrigerating field, in particular to a kind of method for controlling oil return of air-cooled screw rod unit and device, air-cooled screw rod unit.
Background technology
In correlation technique, common air-cooled screw rod unit is at partial load condition, because the circulation coolant quantity of unit is lower; Particularly in the low-temperature heating operating mode; The refrigeration oil that causes compressor to be discharged can't in time be got back to compressor inside, causes the compressor oil starvation, damages compressor.
Often cause the problem damaged to compressor in the correlation technique, do not propose effective solution at present as yet because of oil starvation.
Summary of the invention
Often cause the problem of having damaged because of oil starvation and propose the present invention to compressor in the correlation technique, for this reason, fundamental purpose of the present invention is to provide a kind of method for controlling oil return and device of air-cooled screw rod unit, air-cooled screw rod unit, to address the above problem.
To achieve these goals, according to an aspect of the present invention, a kind of method for controlling oil return of air-cooled screw rod unit is provided.This method for controlling oil return comprises: unit is opened; Mainboard is judged whether 100% operation of said unit; Wherein, said mainboard is when confirming that said unit 100% moves, and said mainboard is controlled said unit and added the unloading operation according to load; Said mainboard not when 100% moves, judges whether the low oil level switch of compressor breaks off at definite said unit; When said mainboard breaks off at the low oil level switch that detects said compressor, confirm that then unit needs oil return; Said mainboard is controlled said unit oil return.
To achieve these goals, according to a further aspect in the invention, a kind of oil return control device of air-cooled screw rod unit is provided.This oil return control device comprises: first judge module, and be used for opening the back and judge whether 100% operation of said unit at unit, wherein, when confirming said unit 100% operation, control said unit and add unloading according to load and move; Second judge module is used at definite said unit not when 100% moves, judging whether the low oil level switch of compressor breaks off; First control module is used for when the low oil level switch that detects said compressor breaks off, controlling said unit oil return; And second control module is used for when the high oil level switch that detects said compressor is closed, then controls said unit and withdrawing from oil return.
Through the present invention, adopt unit to open; Mainboard is judged whether 100% operation of said unit; Wherein, said mainboard is when confirming that said unit 100% moves, and said mainboard is controlled said unit and added the unloading operation according to load; Said mainboard not when 100% moves, judges whether the low oil level switch of compressor breaks off at definite said unit; When said mainboard breaks off at the low oil level switch that detects said compressor, confirm that then unit needs oil return; Said mainboard is controlled said unit oil returning method, has solved compressor in the correlation technique and has often caused the problem damaged because of oil starvation, and then reached the effect that improves the compressor life-span.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the method for controlling oil return process flow diagram according to the air-cooled screw rod unit of the embodiment of the invention;
Fig. 2 is the synoptic diagram according to the air-cooled screw rod unit of the embodiment of the invention;
Fig. 3 is the process flow diagram according to the preferred embodiment of the method for controlling oil return of air-cooled screw rod unit of the present invention; And
Fig. 4 is the synoptic diagram according to the oil return control device of the air-cooled screw rod unit of the embodiment of the invention.
Embodiment
Need to prove that under the situation of not conflicting, embodiment and the characteristic among the embodiment among the application can make up each other.Below with reference to accompanying drawing and combine embodiment to specify the present invention.
Fig. 1 is the method for controlling oil return process flow diagram according to the air-cooled screw rod unit of the embodiment of the invention.
As shown in Figure 1, this method comprises following step:
Step S102, unit is opened.
Step S104, mainboard judge whether 100% operation of said unit; Wherein, said mainboard is when confirming that said unit 100% moves, and said mainboard is controlled said unit and added the unloading operation according to load.
Step S106, said mainboard not when 100% moves, judges whether the low oil level switch of compressor breaks off at definite said unit.
When step S108, said mainboard break off at the low oil level switch that detects said compressor, then control said unit oil return.
Step S110, said mainboard is then controlled said unit and is withdrawed from oil return when the high oil level switch that detects said compressor is closed.
Preferably, said mainboard is when the said unit oil return of control, and said mainboard is controlled said compressor 100% operation, and the control electric expansion valve reaches maximum step number.
Further, said mainboard is controlled 100% operation of said compressor, and the control electric expansion valve reaches maximum step number and can comprise: said mainboard judges whether the high oil level switch of said compressor is closed; Said mainboard is controlled said unit and is kept 100% operation when detecting said high oil level switch and do not have closure; Said mainboard is then controlled said unit and is withdrawed from oil return detecting said high oil level switch when closed, gets into again by load to add the unloading operation.
Preferably; Mainboard is judged whether the low oil level switch of compressor breaks off and comprised: whether the low oil level switch that the continuous very first time of said mainboard is detected said compressor breaks off; Wherein, When said mainboard detects said compressor in continuous very first time low oil level switch all breaks off, confirm that the low oil level switch of said compressor breaks off.
Need to prove; Can in computer system, carry out in the step shown in the process flow diagram of accompanying drawing such as a set of computer-executable instructions; And; Though logical order has been shown in process flow diagram, in some cases, can have carried out step shown or that describe with the order that is different from here.
The present invention is through adopting the air-cooled screw rod unit of new oil return control mode; Compare with the air-cooled screw rod unit of tradition; The compressor that can guarantee unit can both have enough refrigeration oils under any operating mode and any load, guarantee the reliability of unit, avoids because oil starvation causes compressor to burn.
Fig. 2 is the synoptic diagram according to the air-cooled screw rod unit of the embodiment of the invention.
As shown in Figure 2; This air-cooled screw rod unit comprises: compressor 1; One end is connected to first end of four-way valve 2, and the other end is connected with gas-liquid separator 10, and second end of said four-way valve 2 is connected to first end of fin 3; Second end is connected to said gas-liquid separator 10; The 3rd end is connected to case tube heat exchanger 9, and second end of said fin 3 is connected to first end of reservoir 6 via heating expansion valve 4 and retaining valve 5, and second end of said reservoir 6 is connected to case tube heat exchanger 9 via refrigeration expansion valve 7 with retaining valve 8.
Fig. 3 is the process flow diagram according to the preferred embodiment of the method for controlling oil return of air-cooled screw rod unit of the present invention.As shown in Figure 3, this method may further comprise the steps:
After the unit start, add the unloading operation by load, mainboard judges that whether unit 100% moves; If unit 100% operation; Then add the unloading operation by load, if not 100% operation, then mainboard judges that unit is partial load condition operation or bad working environments operation.
Preferably, unit adopts the compressor that has the height oil level switch, and continuous 5 seconds unit mainboards detect the inner low oil level switch of compressor and break off; Show that compressor has lacked lubricating oil, then this moment, the unit mainboard was by the compressor displacement regulating closed electromagnetic valve, loaded solenoid valve and got; Make compressor loads to 100%, unit mainboard control electric expansion valve reaches maximum, and this moment, the internal circulating load of system was maximum; It is maximum that mass rate reaches, and it is maximum that the shearing force that had at the suction side refrigerant this moment reaches, and can the lubricating oil in the heat interchanger all be brought back to compressor; The unit operation certain hour, the inner high oil level switch of compressor is closed up to detecting, and shows that the compressor interior oil is full; Then withdraw from the oil return steering logic; Be the step number before electric expansion valve reaches oil return, compressor adds unloading by load again, and unit adds unloading by normal water temperature control.
Unit is in partial load condition operation or bad working environments operation; Mainboard judges whether compressor low oil level switch breaks off; If detecting compressor low oil level switch does not break off; Then operation of unit retaining part load condition or bad working environments operation are broken off if detect compressor low oil level switch, and then mainboard is judged as unit needs oil return.
During the unit oil return, mainboard control compressor to 100% moves, and electric expansion valve is reached maximum step number; Mainboard judges whether the high oil level switch of compressor is closed, do not have closure if mainboard detects high oil level switch, and then unit keeps 100%; Electric expansion valve reaches the operation of maximum step number; If it is closed that mainboard detects high oil level switch, then unit withdraws from oil return, gets into again by load to add the unloading operation.
Fig. 4 is the synoptic diagram according to the oil return control device of the air-cooled screw rod unit of the embodiment of the invention.As shown in Figure 4, this oil return control device comprises first judge module 402, second judge module 404, first control module 406 and second control module 408.
Wherein, first judge module 402 is used for opening the back at unit and judges whether 100% operation of said unit, wherein, when confirming said unit 100% operation, controls said unit and adds unloading according to load and move;
Second judge module 404 is used at definite said unit not when 100% moves, judging whether the low oil level switch of compressor breaks off.
First control module 406 is used for when the low oil level switch that detects said compressor breaks off, the oil return of control unit.
Second control module 408 is used for when the low oil level switch that detects said compressor does not break off, controlling said unit and withdrawing from oil return.
Preferably; Above-mentioned oil return control device also comprises: second judge module is used to judge whether 100% operation of said unit, wherein; When confirming that said unit 100% moves; Control said unit and add the unloading operation, not when 100% moves, judge whether the low oil level switch of compressor breaks off at definite said unit according to load.
Preferably, said first control module comprises: judge submodule, be used to judge whether the high oil level switch of said compressor is closed; First controlling sub is used for when detecting said high oil level switch and do not have closure, controls said unit and keeps 100% operation; Second controlling sub is used for then controlling said unit and withdrawing from oil return detecting said high oil level switch when closed, gets into again by load to add the unloading operation.
Preferably; Said second control module comprises: whether said first judge module is used for the low oil level switch that the continuous very first time detects said compressor and breaks off; When the low oil level switch that said second judge module is used in continuous very first time, detecting said compressor all breaks off, confirm that the low oil level switch of said compressor breaks off.
Need to prove that the air-cooled screw rod unit that the embodiment of the invention provided can comprise any one oil return control device that the embodiment of the invention provides.
From above description, can find out that the present invention has solved the problem of air-cooled screw rod unit in partial load condition and the oil return in time of low-temperature heating operating mode compressor well, has very big practicality and novelty.Can improve the compressor life-span.
Obviously, it is apparent to those skilled in the art that above-mentioned each module of the present invention or each step can realize with the general calculation device; They can concentrate on the single calculation element; Perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element; Thereby; Can they be stored in the memory storage and carry out, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize by calculation element.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. the method for controlling oil return of an air-cooled screw rod unit is characterized in that, comprising:
Unit is opened;
Mainboard is judged whether 100% operation of said unit,
Wherein, said mainboard is when confirming that said unit 100% moves, and said mainboard is controlled said unit and added the unloading operation according to load, and said mainboard not when 100% moves, judges whether the low oil level switch of compressor breaks off at definite said unit;
When said mainboard breaks off at the low oil level switch that detects said compressor, then control said unit oil return; And
Said mainboard is then controlled said unit and is withdrawed from oil return when the high oil level switch that detects said compressor is closed.
2. method for controlling oil return according to claim 1 is characterized in that, said mainboard is controlled said unit oil return and comprised: said mainboard is controlled said compressor 100% operation, and the control electric expansion valve reaches maximum step number.
3. method for controlling oil return according to claim 2 is characterized in that, the step that said mainboard is controlled said compressor 100% operation comprises:
Said mainboard judges whether the high oil level switch of said compressor is closed;
Said mainboard is controlled said compressor and is kept 100% operation when detecting said high oil level switch and do not have closure; And
Said mainboard is controlled said unit and is withdrawed from oil return detecting said high oil level switch when closed, gets into by load to add the unloading operation.
4. method for controlling oil return according to claim 1 is characterized in that,
Mainboard is judged whether the low oil level switch of compressor breaks off and is comprised:
Whether the low oil level switch that the continuous very first time of said mainboard is detected said compressor breaks off,
Wherein, when said mainboard detects said compressor in continuous very first time low oil level switch all breaks off, confirm that the low oil level switch of said compressor breaks off.
5. the oil return control device of an air-cooled screw rod unit is characterized in that, comprising:
First judge module is used for opening the back at unit and judges whether 100% operation of said unit, wherein, when confirming said unit 100% operation, controls said unit and adds unloading according to load and move;
Second judge module is used for when 100% moves, not judging whether the low oil level switch of compressor breaks off at definite said unit;
First control module is used for when the low oil level switch that detects said compressor breaks off, controlling said unit oil return; And
Second control module is used for when the high oil level switch that detects said compressor is closed, then controls said unit and withdrawing from oil return.
6. oil return control device according to claim 5 is characterized in that, said first control module comprises:
Judge submodule, be used to judge whether the high oil level switch of said compressor is closed;
First controlling sub is used for when detecting said high oil level switch and do not have closure, controls said unit and keeps 100% operation; And
Second controlling sub is used for then controlling said unit and withdrawing from oil return detecting said high oil level switch when closed, gets into again by load to add the unloading operation.
7. oil return control device according to claim 5 is characterized in that, said control module comprises:
Whether said first judge module is used for the low oil level switch that the continuous very first time detects said compressor and breaks off,
When the low oil level switch that said first control module is used in continuous very first time, detecting said compressor all breaks off, confirm that the low oil level switch of said compressor breaks off.
8. an air-cooled screw rod unit comprises compressor, and electric expansion valve is characterized in that, also comprises each described oil return control device in the claim 5 to 7.
9. air-cooled screw rod unit according to claim 8 is characterized in that said oil return control device is used for when said electric expansion valve reaches maximum step number, controls said compressor 100% operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010612486 CN102566456B (en) | 2010-12-29 | 2010-12-29 | Air cooling screw chiller, oil return control method and device therefor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010612486 CN102566456B (en) | 2010-12-29 | 2010-12-29 | Air cooling screw chiller, oil return control method and device therefor |
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| CN102566456A true CN102566456A (en) | 2012-07-11 |
| CN102566456B CN102566456B (en) | 2013-08-14 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103629866A (en) * | 2012-08-20 | 2014-03-12 | 珠海格力电器股份有限公司 | Oil return control system and method of refrigeration compressor and air conditioner unit provided with oil return control system |
| CN107631519A (en) * | 2017-08-18 | 2018-01-26 | 珠海格力电器股份有限公司 | Air-conditioner set automatic oil return control method, device, storage medium and air-conditioner set |
| CN113899093A (en) * | 2021-10-20 | 2022-01-07 | 中国船舶重工集团公司第七0四研究所 | Identification and prejudgment method for oil return fault of screw type refrigeration compressor |
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| JPH10141787A (en) * | 1996-11-06 | 1998-05-29 | Kobe Steel Ltd | Screw refrigerating machine |
| US20030051494A1 (en) * | 2001-09-20 | 2003-03-20 | Shigeki Ohya | Refrigerant cycle system including two evaporators |
| CN101338961A (en) * | 2008-08-18 | 2009-01-07 | 南京天加空调设备有限公司 | Automatic oil return control method and device for refrigeration system |
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2010
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Patent Citations (4)
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| JPH10141787A (en) * | 1996-11-06 | 1998-05-29 | Kobe Steel Ltd | Screw refrigerating machine |
| US20030051494A1 (en) * | 2001-09-20 | 2003-03-20 | Shigeki Ohya | Refrigerant cycle system including two evaporators |
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| 张士强等: "螺杆式制冷机回油方法的缺陷分析及改进方法", 《暖通空调》, vol. 33, no. 3, 31 March 2003 (2003-03-31), pages 132 - 132 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103629866A (en) * | 2012-08-20 | 2014-03-12 | 珠海格力电器股份有限公司 | Oil return control system and method of refrigeration compressor and air conditioner unit provided with oil return control system |
| CN103629866B (en) * | 2012-08-20 | 2015-10-28 | 珠海格力电器股份有限公司 | The oil return control system of refrigeration compressor and method and there is its air-conditioner set |
| CN107631519A (en) * | 2017-08-18 | 2018-01-26 | 珠海格力电器股份有限公司 | Air-conditioner set automatic oil return control method, device, storage medium and air-conditioner set |
| CN113899093A (en) * | 2021-10-20 | 2022-01-07 | 中国船舶重工集团公司第七0四研究所 | Identification and prejudgment method for oil return fault of screw type refrigeration compressor |
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| CN102566456B (en) | 2013-08-14 |
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