CN103062948A - Dual parallel compressor screw water chilling unit - Google Patents

Dual parallel compressor screw water chilling unit Download PDF

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Publication number
CN103062948A
CN103062948A CN2012105883844A CN201210588384A CN103062948A CN 103062948 A CN103062948 A CN 103062948A CN 2012105883844 A CN2012105883844 A CN 2012105883844A CN 201210588384 A CN201210588384 A CN 201210588384A CN 103062948 A CN103062948 A CN 103062948A
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Prior art keywords
compressor
oil
pipe
communicated
air intake
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CN2012105883844A
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CN103062948B (en
Inventor
郑坚江
路则锋
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Ningbo Aux Electric Co Ltd
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Ningbo Aux Electric Co Ltd
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Abstract

The invention relates to the technical field of a screw water chilling unit, particularly to a dual parallel compressor screw water chilling unit. An evaporator (3) is a falling film evaporator. A first overflow pipe (10) for redundant lubricating oil output is arranged on a first compressor (4) and a second overflow pipe (11) for redundant lubrication oil output is arranged on a second compressor (5). The first overflow pipe (10) communicates with a first exhaust pipe (8) and the second overflow pipe (11) communicates with a second exhaust pipe (9). A partition (12) for isolating the lubricating oil separated from the two compressors is arranged in a twice oil separator (1).The dual parallel compressor screw water chilling unit has the advantages of having a nice oil return effect, a simple structure, a reliable work, an energy conservation, an environment friendliness and a low cost.

Description

The double-compressor parallel-screw handpiece Water Chilling Units
Technical field
The present invention relates to the screw chiller technical group field, relate in particular to a kind of double-compressor parallel-screw handpiece Water Chilling Units.
Background technology
It is to move under part load condition that conventional bolt cold water unit has the time more than 90%.The whole comprehensive part load performance coefficient (IPLV) in season that uses of bolt cold water unit can reflect more than the full load coefficient of performance (COP) under the nominal condition whether unit is energy-conservation.In recent years, for realizing energy-conservation purpose, government department has also put into effect policy, requires public building summer air-conditioning design temperature must not be lower than 26 ℃, must not be higher than 20 ℃ winter.This so that the more time of air-conditioning unit operate in part load condition.The part load performance that improves unit has very large meaning to building energy conservation.
Owing to be subject to the restriction of the factors such as material, technological level, cost, the difficulty that promotes air-conditioning unit full load performance is increasing, adopts compressor parallel to provide a kind of effective means for promoting the unit part load performance.For the bolt cold water unit, can select 2 compressors, this has again 2 kinds of schemes, and a kind of is double-compressor parallel system (double-compressor single system), and another kind is the double-compressor dual system.For the double-compressor dual system, when a compressor unloaded, nearly half the heat exchange area of evaporimeter and condenser can not participate in heat exchange; And for the double-compressor parallel system, when a compressor unloaded, the electric efficiency of another compressor can not reduce, and the heat exchange area of heat exchanger is equivalent to increase one times, so the sub-load efficiency of the bolt cold water unit of double-compressor parallel is higher, power savings advantages is very obvious.
Evaporimeter in the double-compressor parallel-screw handpiece Water Chilling Units of prior art generally adopts the evaporimeter of full-liquid type or dry type, these two kinds of evaporimeter thermal effects are lower, the coolant injection amount is higher, and the oil return reliability is lower and cost is higher, so be not very energy-saving and environmental protection and economy.
And prior art oil way balance system is the key technology of double-compressor parallel-screw handpiece Water Chilling Units.In the actual motion, Chang Yinwei oil piping system design is unreasonable, cause the compressor oil starvation and burn, the fault such as warning he so that system can't normally moves.Disclose a kind of " multiple machines parallel connection intelligent oil way balance system " on the China national intellectual property board web a kind of technical scheme is provided, but this scheme needs compressor assembly lube level sensor, its shortcoming is that cost is higher, and assembly difficulty is high, realizes that difficulty is large.
Summary of the invention
Technical problem to be solved by this invention is: provide that a kind of oil return is effective, simple in structure, reliable operation, energy-saving and environmental protection and economic double-compressor parallel-screw handpiece Water Chilling Units.
The technical solution adopted in the present invention is: a kind of double-compressor parallel-screw handpiece Water Chilling Units, the compressor that comprises two parallel connections, external shared secondary oil separator, condenser and evaporimeter, described two compressors are respectively the first compressor and the second compressor, be respectively equipped with the first air intake duct and the second air intake duct on described the first compressor and the second compressor, described evaporimeter is communicated with the first air intake duct and the second air intake duct respectively, described condenser is communicated with secondary oil separator and evaporimeter respectively, described the first compressor is provided with the downtake pipe for exhaust, also be provided with the second exhaust pipe for exhaust on described the second compressor, described downtake pipe and second exhaust pipe all are communicated with secondary oil separator, it is characterized in that: described evaporimeter is downward film evaporator, be respectively equipped with the first overflow pipe and second overflow pipe of deriving for unnecessary lubricating oil on described the first compressor and the second compressor, described the first overflow pipe is communicated with downtake pipe, described the second overflow pipe is communicated with second exhaust pipe, and also be provided with in the described secondary oil separator for the dividing plate that separates respectively the lubricating oil of separating from two compressors, and the second oil return opening that described secondary oil separator is provided with for first oil return opening of deriving the lubricating oil of coming from downtake pipe and is used for deriving the lubricating oil of coming from second exhaust pipe, described the first oil return opening is communicated with the second air intake duct by the first intersection return line, and described the second oil return opening is communicated with the first air intake duct by the second intersection return line.
Described the first oil return opening also is communicated with the first air intake duct by the first return line, described the second oil return opening is communicated with the second air intake duct by the second return line, and is equipped with magnetic valve on described the first intersection return line, the second intersection return line, the first return line and the second return line.
Be equipped with check valve on described the first overflow pipe and the second overflow pipe.
Pipeline between described evaporimeter and the condenser is provided with device for drying and filtering and choke valve.
It also comprises two injectors and the air entraining pipe that is used for drawing the gases at high pressure in the secondary oil separator, described two injectors are respectively the first injector and the second injector, described the first injector is communicated with air entraining pipe, the first air intake duct and evaporimeter, and described the second injector is communicated with air entraining pipe, the second air intake duct and evaporimeter.
Adopt above structure compared with prior art, the present invention has the following advantages: the present invention adopts two overflow pipes that lubricating oil unnecessary in two compressors is imported to secondary oil separator, then the lubricating oil that will derive from different compressors by dividing plate separates, prevent that they are back in two compressors after mixing again, by two oil-outs and the return line that intersects lubricating oil unnecessary in one compressor is imported in the other compressor that lacks lubricating oil at last, be higher than like this compressor that lubricating oil in the compressor of normal oil level just can enter low oil level, thereby realize the intersection oil return of parallel connection compressor, so just realized oil way balance, oil return is effective, the unit fault of having avoided compressor to cause because of oil starvation, and the present invention is simple in structure, install also more convenient, reliability is higher, and does not need the assembly lube level sensor, so cost is lower, and evaporimeter of the present invention is to adopt downward film evaporator, so more energy-conservation, environmental protection and economy.
The lubricating oil that will flow out in the oil return opening by two return lines is led and is got back in original compressor; and be equipped with magnetic valve on described two intersection return lines and two return lines; like this when only having compressor operation; can open the magnetic valve on the return line that is communicated with this compressor; then close all the other magnetic valves; guaranteed so on the one hand normal oil return; avoid on the other hand exhaust to be leaked to low-pressure side by the intersection return line, improved refrigerating capacity and the efficiency of unit.
Because be provided with check valve at two overflow pipes; like this when only having compressor operation; because overflow pipe is provided with check valve; can prevent that high pressure gas from blowing back into the unit low-pressure side by overflow pipe, compressor inner chamber; refrigerating capacity and the efficiency of unit have been improved; when this check valve can also prevent compressor shutdown in addition, owing to the exhaust high pressure blows back into the compressor damage that the compressor high-pressure chamber causes that compressor reverse rotation causes.
The gases at high pressure of drawing from the upper gaseous phase space of secondary oil separator by injector have improved the reliability of ejecting scavenge return as injection power.
Description of drawings
Fig. 1 is the structural representation of double-compressor parallel-screw handpiece Water Chilling Units of the present invention.
As shown in the figure: 1, secondary oil separator; 2, condenser; 3, evaporimeter; 4, the first compressor; 5, the second compressor; 6, the first air intake duct; 7, the second air intake duct; 8, downtake pipe; 9, second exhaust pipe; 10, the first overflow pipe; 11, the second overflow pipe; 12, dividing plate; 13, the first oil return opening; 14, the second oil return opening; 15, the first intersection return line; 16, the second intersection return line; 17, the first return line; 18, the second return line; 19, magnetic valve; 20, check valve; 21, device for drying and filtering; 22, choke valve; 23, air entraining pipe; 24, the first injector; 25, the second injector.
The specific embodiment
Below in conjunction with accompanying drawing and the specific embodiment the present invention is described further, but the present invention is not limited only to the following specific embodiment.
As shown in the figure: a kind of double-compressor parallel-screw handpiece Water Chilling Units, the compressor that comprises two parallel connections, external shared secondary oil separator 1, condenser 2 and evaporimeter 3, described two compressors are respectively the first compressor 4 and the second compressor 5, be respectively equipped with the first air intake duct 6 and the second air intake duct 7 on described the first compressor 4 and the second compressor 5, described evaporimeter 3 is communicated with the first air intake duct 6 and the second air intake duct 7 respectively, described condenser 2 is communicated with secondary oil separator 1 and evaporimeter 3 respectively, described the first compressor 4 is provided with the downtake pipe 8 for exhaust, also be provided with the second exhaust pipe 9 for exhaust on described the second compressor 5, described downtake pipe 8 and second exhaust pipe 9 all are communicated with secondary oil separator 1, described evaporimeter 3 is downward film evaporator, be respectively equipped with the first overflow pipe 10 and second overflow pipe 11 of deriving for unnecessary lubricating oil on described the first compressor 4 and the second compressor 5, described the first overflow pipe 10 is communicated with downtake pipe 8, described the second overflow pipe 11 is communicated with second exhaust pipe 9, and also be provided with in the described secondary oil separator 1 for the dividing plate 12 that separates respectively the lubricating oil of separating from two compressors, and the second oil return opening 14 that described secondary oil separator 1 is provided with for first oil return opening 13 of deriving the lubricating oil of coming from downtake pipe 8 and is used for deriving the lubricating oil of coming from second exhaust pipe 9, described the first oil return opening 13 is communicated with the second air intake duct 7 by the first intersection return line 15, and described the second oil return opening 14 is communicated with the first air intake duct 6 by the second intersection return line 16.The outlet side of described secondary oil separator 1 is communicated with by the inlet end of high-pressure air pipe with condenser 2, the liquid outlet of described condenser 2 is communicated with the inlet of evaporimeter 3 through drain pipe, device for drying and filtering 21 choke valves 22, feed tube successively, and the gas outlet of described evaporimeter 3 is communicated with the first air intake duct 6 and the second air intake duct 7 respectively.
Described the first oil return opening 13 also is communicated with the first air intake duct 6 by the first return line 17, described the second oil return opening 14 is communicated with the second air intake duct 7 by the second return line 18, and is equipped with magnetic valve 19 on described the first intersection return line 15, the second intersection return line 16, the first return line 17 and the second return line 18.Described the first intersection return line 15 1 ends and the first return line 17 1 ends all are communicated with the first oil return opening 13 by the first three-way pipe, and described the second intersection return line 16 1 ends and the second return line 18 1 ends also are communicated with the second oil return opening 14 by the second three-way pipe.
Be equipped with check valve 20 on described the first overflow pipe 10 and the second overflow pipe 11.
Pipeline between described evaporimeter 3 and the condenser 2 is provided with device for drying and filtering 21 and choke valve 22.
It also comprises two injectors and the air entraining pipe 23 that is used for drawing the gases at high pressure in the secondary oil separator 1, described two injectors are respectively the first injector 24 and the second injector 25, described the first injector 24 is communicated with air entraining pipe 23, the first air intake duct 6 and evaporimeter 3, and described the second injector 25 is communicated with air entraining pipe 23, the second air intake duct 7 and evaporimeter 3.Two oil-outs on the described evaporimeter 3 are communicated with respectively two angle valves, described two angle valves are communicated with respectively two and draw oil pipe, described two are drawn oil pipe and are communicated with the first injector 24 and the second injector 25 respectively, and described the first injector 24 is communicated with air entraining pipe 23 by three-way pipe with the second injector 25.
The course of work of the present invention is:
When two parallel connection compressors move simultaneously, magnetic valve 19 on the first intersection return line 15 and the second intersection return line 16 is opened, magnetic valve 19 on the first return line 17 and the second return line 18 cuts out, when the oil level in the first compressor 4 or the second compressor 5 is higher than normal oil level, unnecessary lubricating oil will enter downtake pipe 8 or second exhaust pipe 9 by the first overflow pipe 10 or the second overflow pipe 11, then separate through secondary oil separator 1, owing to be provided with dividing plate 12 in the secondary oil separator 1, enter the first oil return opening 13 after the lubricating oil separation of carrying in the downtake pipe 8, enter the second oil return opening 14 after the lubricating oil separation of carrying in the second exhaust pipe 9, lubricating oil in the first oil return opening 13 enters in the second air intake duct 7 through the first intersection return line 15, then enters the second compressor 5; Lubricating oil in the second oil return opening 14 enters in the first air intake duct 6 through the second intersection return line 16, then enters the first compressor 4, thereby realizes the purpose of intersection oil return and balanced oil level.
When only having compressor operation in two compressors; such as the first compressor 4 operations; the second compressor 5 is shut down; magnetic valve on the first return line 17 is opened at this moment; magnetic valve on other pipelines all cuts out, and the entrained lubricating oil of the first compressor 4 enters the first oil return opening 13 after secondary oil separator 1 separates; then in the first return line 17 enters the first air intake duct 6, enter at last in the first compressor 4.When the first compressor 4 is shut down, during 5 operation of the second compressor similarly.
When two parallel connection compressors move or during isolated operation simultaneously, gases at high pressure are drawn by air entraining pipe 23 from the gas-phase space of secondary oil separator 1, then be divided into two-way by three-way pipe, enter respectively the first injector 24 and the second injector 24, form low-pressure area, the liquid oil mixture that will draw in the oil pipe is introduced, and gas, liquid, oil enter two air intake ducts after mixing in two injectors, and then get back in two compressors.Thereby realize the purpose of gas injection oil return.

Claims (5)

1. double-compressor parallel-screw handpiece Water Chilling Units, the compressor that comprises two parallel connections, external shared secondary oil separator (1), condenser (2) and evaporimeter (3), described two compressors are respectively the first compressor (4) and the second compressor (5), be respectively equipped with the first air intake duct (6) and the second air intake duct (7) on described the first compressor (4) and the second compressor (5), described evaporimeter (3) is communicated with the first air intake duct (6) and the second air intake duct (7) respectively, described condenser (2) is communicated with secondary oil separator (1) and evaporimeter (3) respectively, described the first compressor (4) is provided with the downtake pipe (8) for exhaust, also be provided with the second exhaust pipe (9) for exhaust on described the second compressor (5), described downtake pipe (8) and second exhaust pipe (9) all are communicated with secondary oil separator (1), it is characterized in that: described evaporimeter (3) is downward film evaporator, be respectively equipped with the first overflow pipe (10) and second overflow pipe (11) of deriving for unnecessary lubricating oil on described the first compressor (4) and the second compressor (5), described the first overflow pipe (10) is communicated with downtake pipe (8), described the second overflow pipe (11) is communicated with second exhaust pipe (9), and also be provided with in the described secondary oil separator (1) for the dividing plate (12) that separates respectively the lubricating oil of separating from two compressors, and the second oil return opening (14) that described secondary oil separator (1) is provided with for first oil return opening (13) of deriving the lubricating oil of coming from downtake pipe (8) and is used for deriving the lubricating oil of coming from second exhaust pipe (9), described the first oil return opening (13) is communicated with the second air intake duct (7) by the first intersection return line (15), and described the second oil return opening (14) is communicated with the first air intake duct (6) by the second intersection return line (16).
2. double-compressor parallel-screw handpiece Water Chilling Units according to claim 1, it is characterized in that: described the first oil return opening (13) also is communicated with the first air intake duct (6) by the first return line (17), described the second oil return opening (14) is communicated with the second air intake duct (7) by the second return line (18), and is equipped with magnetic valve (19) on described the first intersection return line (15), the second intersection return line (16), the first return line (17) and the second return line (18).
3. double-compressor parallel-screw handpiece Water Chilling Units according to claim 1 is characterized in that: be equipped with check valve (20) on described the first overflow pipe (10) and the second overflow pipe (11).
4. double-compressor parallel-screw handpiece Water Chilling Units according to claim 1, it is characterized in that: the pipeline between described evaporimeter (3) and the condenser (2) is provided with device for drying and filtering (21) and choke valve (22).
5. double-compressor parallel-screw handpiece Water Chilling Units according to claim 1, it is characterized in that: it also comprises two injectors and the air entraining pipe (23) that is used for drawing the gases at high pressure in the secondary oil separator (1), described two injectors are respectively the first injector (24) and the second injector (25), described the first injector (24) is communicated with air entraining pipe (23), the first air intake duct (6) and evaporimeter (3), and described the second injector (25) is communicated with air entraining pipe (23), the second air intake duct (7) and evaporimeter (3).
CN201210588384.4A 2012-12-29 2012-12-29 Dual parallel compressor screw water chilling unit Active CN103062948B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106907883A (en) * 2015-12-23 2017-06-30 宁波奥克斯电气股份有限公司 A kind of handpiece Water Chilling Units are with parallel dual system gs-oil separator
CN108954884A (en) * 2018-09-19 2018-12-07 西安交通大学 A kind of cold and hot double SCREW COMPRESSORs processed

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JP2001324230A (en) * 2000-05-18 2001-11-22 Daikin Ind Ltd Refrigerating apparatus
JP2004251528A (en) * 2003-02-20 2004-09-09 Mitsubishi Electric Corp Refrigerating air-conditioning device
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CN101290006A (en) * 2007-04-18 2008-10-22 海尔集团公司 Multi- compressor oil equalizing system
CN201269660Y (en) * 2008-10-07 2009-07-08 珠海格力电器股份有限公司 Double-compressor parallel screw hydraulic filling type water chilling unit system
CN101749889A (en) * 2008-12-11 2010-06-23 株式会社富士通将军股份有限公司 Refrigeration apparatus
CN101762107A (en) * 2008-12-24 2010-06-30 珠海格力电器股份有限公司 Double-compressor parallel-screw flooded-type water chilling unit system
CN201740315U (en) * 2010-07-12 2011-02-09 宁波奥克斯电气有限公司 Oil balance device for parallel-compressor air conditioner
CN202350391U (en) * 2011-12-08 2012-07-25 北方工业大学 Oil return system of efficient heat pump unit

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001324230A (en) * 2000-05-18 2001-11-22 Daikin Ind Ltd Refrigerating apparatus
JP2004251528A (en) * 2003-02-20 2004-09-09 Mitsubishi Electric Corp Refrigerating air-conditioning device
CN101290006A (en) * 2007-04-18 2008-10-22 海尔集团公司 Multi- compressor oil equalizing system
CN201116804Y (en) * 2007-08-14 2008-09-17 浙江盾安人工环境设备股份有限公司 Multiple machines parallel connection intelligent oil way balance system
CN201269660Y (en) * 2008-10-07 2009-07-08 珠海格力电器股份有限公司 Double-compressor parallel screw hydraulic filling type water chilling unit system
CN101749889A (en) * 2008-12-11 2010-06-23 株式会社富士通将军股份有限公司 Refrigeration apparatus
CN101762107A (en) * 2008-12-24 2010-06-30 珠海格力电器股份有限公司 Double-compressor parallel-screw flooded-type water chilling unit system
CN201740315U (en) * 2010-07-12 2011-02-09 宁波奥克斯电气有限公司 Oil balance device for parallel-compressor air conditioner
CN202350391U (en) * 2011-12-08 2012-07-25 北方工业大学 Oil return system of efficient heat pump unit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106907883A (en) * 2015-12-23 2017-06-30 宁波奥克斯电气股份有限公司 A kind of handpiece Water Chilling Units are with parallel dual system gs-oil separator
CN108954884A (en) * 2018-09-19 2018-12-07 西安交通大学 A kind of cold and hot double SCREW COMPRESSORs processed

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Address after: 315191 No. 1166 Mingguang North Road, Yinzhou Industrial Park, Zhejiang, Ningbo

Patentee after: NINGBO AUX ELECTRIC CO., LTD.

Address before: 315191 No. 1166 Mingguang North Road, Yinzhou Industrial Park, Zhejiang, Ningbo

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