CN102635551B - Two-stage screw compression type freezing device - Google Patents
Two-stage screw compression type freezing device Download PDFInfo
- Publication number
- CN102635551B CN102635551B CN201210032345.6A CN201210032345A CN102635551B CN 102635551 B CN102635551 B CN 102635551B CN 201210032345 A CN201210032345 A CN 201210032345A CN 102635551 B CN102635551 B CN 102635551B
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- grade
- oil
- screw compression
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- bearing
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Classifications
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- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41B—SHIRTS; UNDERWEAR; BABY LINEN; HANDKERCHIEFS
- A41B11/00—Hosiery; Panti-hose
- A41B11/10—Stocking protectors
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- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41B—SHIRTS; UNDERWEAR; BABY LINEN; HANDKERCHIEFS
- A41B11/00—Hosiery; Panti-hose
- A41B11/02—Reinforcements
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- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41B—SHIRTS; UNDERWEAR; BABY LINEN; HANDKERCHIEFS
- A41B11/00—Hosiery; Panti-hose
- A41B11/12—Means at the upper end to keep the stockings up
- A41B11/121—Elastic or flexible yarns knitted into the upper end
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04B—KNITTING
- D04B1/00—Weft knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
- D04B1/10—Patterned fabrics or articles
- D04B1/102—Patterned fabrics or articles with stitch pattern
- D04B1/108—Gussets, e.g. pouches or heel or toe portions
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04B—KNITTING
- D04B1/00—Weft knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
- D04B1/22—Weft knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes specially adapted for knitting goods of particular configuration
- D04B1/24—Weft knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes specially adapted for knitting goods of particular configuration wearing apparel
- D04B1/26—Weft knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes specially adapted for knitting goods of particular configuration wearing apparel stockings
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
The present invention provides a two-stage screw compression type freezing device. Through a first-stage screw compression part and a second-stage screw compression part which are connected in series, the two-stage screw compression type freezing device is provided with the following components: an oil supply flow path which supplies oil to a bearing at a release side of the second-stage screw compression part; and an oil discharging flow path which discharges oil from the bearing to a compression space of the first-stage screw compression part. Through the simple structure, the oil can be supplied to the release-side bearing even when the suction pressure of the first stage increases and the release pressure of the second stage reduces.
Description
Technical field
The present invention relates to 2 grades of screw compression formula refrigerating plants.
Background technique
Using oil-cooled type screw compressor is known by the refrigerating plant of 2 grades of compressions of refrigerant.On the rotor chamber and bearing of oil-cooled type screw compressor, for cooling and lubricated etc. and need to supply oil supply.In the situation that using oil-cooled type screw compressor, the oil generally refrigerant from spuing being separated is by pressure the resupplying everywhere to helical-lobe compressor that spue of refrigerant.
In 2 grades of screw compression formula refrigerating plants, the suction pressure of the 1st grade determines by the evaporating temperature of vaporizer, and the pressure that spues of the 2nd grade is determined by the condensing temperature of condenser.In Fig. 3, screw rod and the screw rod of the 2nd grade that represents the 1st grade is the pressure condition of coaxial 2 grades of screw compression formula refrigerating plants.The intermediate pressure of the intermediate pressure portion between the 1st grade and the 2nd grade is determined by the suction pressure of the 1st grade and the mechanical compression ratio of the 1st grade, so exist with ... evaporating temperature.As shown in the figure, in the time that condensing temperature CT is lower, there is intermediate pressure to become the situation higher than the pressure that spues.
Generally, in 2 grades of screw compression formula refrigerating plants, the oil that the bearing of the exhaust end to the screw rod of the 2nd grade is supplied with is discharged in the intermediate pressure space of suction side of the screw rod of the 2nd grade at the exhaust end of the 1st grade.But higher than the pressure that spues if the pressure in intermediate pressure space becomes, the oil that bearing to exhaust end can not be supplied with is discharged, and can not supply with new oil, becomes insufficient so lubricated and cooling, can cause the damage of helical-lobe compressor.
In order to address this problem, in No. 3837298th, Japanese Patent, monitor the pressure that spues poor of intermediate pressure and the 2nd grade, make refrigerant from intermediate pressure portion is back to the suction space of the 1st grade, so that intermediate pressure is high unlike the pressure that spues.In this structure, need to be used for regulating the control of appending of intermediate pressure, also there is the power loss because refrigerant is brought from intermediate pressure portion is back to the suction space of the 1st grade.
Summary of the invention
In view of the above problems, though problem of the present invention is to provide that a kind of suction pressure at the 1st grade rises and the 2nd grade spue when pressure drop, also can be to the bearing of exhaust end the simple and 2 grades of good screw compression formula refrigerating plants of efficiency for oil supply.
In order to solve above-mentioned problem, according to the present invention, by the 1st grade of screw compression portion and the 2nd grade of screw compression portion that are connected in series, 2 grades of screw compression formula refrigerating plants of refrigerant compression are possessed: oil is supplied with stream, and the bearing of the exhaust end to the 2nd grade of screw compression portion is for oil supply; Oil is discharged stream, and the compression volume by above-mentioned oil from above-mentioned bearing to the 1st grade of screw compression portion is discharged.
According to this structure, due to the bearing of exhaust end of the 2nd grade of screw compression portion is communicated to have the 1st grade of screw compression portion suction pressure, and the 1st grade of screw compression portion and the 2nd grade of screw compression portion between intermediate pressure between the compression volume of pressure, so can guarantee sufficient pressure difference, can oil be discharged from bearing and carry out new oily supply.This structure does not need special control, and its structure is also simpler.
In addition, utilizing in 2 grades of screw compression formula refrigerating plants of the present invention, can be also that above-mentioned oil is supplied with stream opening between the end face of the exhaust end of above-mentioned the 2nd grade of screw compression portion and above-mentioned bearing; Above-mentioned oil is discharged stream at above-mentioned bearing and above-mentioned the 2nd grade of side opening that screw compression portion is contrary.
According to this structure, the oily required pressure that subtend oil is supplied with stream supply can not rise because of the pressure loss of bearing.
In addition, utilizing in 2 grades of screw compression formula refrigerating plants of the present invention, also can be, in the refrigerant circulation stream of the exhaust end of above-mentioned the 2nd grade of helical-lobe compressor, be folded with oily separation recoverer, the oil after separating is supplied to above-mentioned oil supply with in stream in above-mentioned oily separation recoverer.
According to this structure, the oil separating can be supplied with stream to above-mentioned oil by the pressure feed of the above-mentioned gas spuing from the gas being spued by above-mentioned the 2nd screw compression portion.
Brief description of the drawings
Fig. 1 is the figure that represents the structure of 2 grades of screw compression formula refrigerating plants of one embodiment of the present invention.
Fig. 2 is the figure of the pressure of 2 grades of screw compression formula refrigerating plants of presentation graphs 1.
Fig. 3 is the figure that represents the pressure of 2 grades of screw compression formula refrigerating plants in the past.
Embodiment
Fig. 1 represents relevant 2 grades of screw compression formula refrigerating plants 1 of the present invention, these 2 grades of screw compression formula refrigerating plants 1 by being folded with 2 grades of oil-cooled type screw compressors 2, oily separation recoverer 3, condenser 4, expansion valve 5 and vaporizer 6, enclose and have the refrigerant circulation stream 7 of refrigerant to form.
2 grades of oil-cooled type screw compressors 2 have the 1st grade of screw compression portion 8 and the 2nd grade of screw compression portion 9 that are connected in series.The 1st grade of screw compression portion 8 contains in the 2nd grade of rotor chamber 13 of inside that 12, the 2 grades of screw compression portions 9 of a pair of the 1st grade of screw rotor of negative and positive are being formed at identical compressor housing 10 and contains a pair of the 2nd grade of screw rotor 14 of negative and positive in the 1st grade of rotor chamber 11 of inside that is formed at compressor housing 10.
The 1st grade of screw compression portion 8 sucks refrigerant compression from the suction port 16 being communicated on the suction passage 15 the refrigerant circulation stream 7 that is connected to upstream side, the intermediate pressure space 18 of delimiting in the housing spuing the 1st grade of screw compression portion 8 and the 2nd grade of screw compression portion 9 from discharge opening 17.The 2nd grade of screw compression portion 9 be from suck refrigerant compression to the suction port 19 of intermediate pressure space 18 openings, from discharge opening 20 downstream the refrigerant circulation stream 7 of side spue.
The 1st grade of screw rotor 12 and the 2nd grade of screw rotor 14 are subject to bearing 21,22,23 rotatably mounted.In addition, a rotor of the 1st grade of screw rotor 12 and a rotor of the 2nd grade of screw rotor 14 have rotor shaft 24, with coaxial rotating.
And then 2 grades of oil-cooled type screw compressors 2 possess the motor 25 that rotor shaft 24 total screw rotor 12,14 is rotarilyd actuate.The motor casing 26 of motor 25 is connected integratedly with compressor housing 10, forms half airtight structure.In motor casing 26, contain and the rotor 27 of screw rotor 12,14 total rotor shafts 24 and the stator 28 of encirclement rotor 27.
In the refrigerant circulation stream 7 of the exhaust end of the 2nd grade of screw compression portion 9, be folded with oily separation recoverer 3.For the bearing 21,22,23 of 2 grades of oil-cooled type screw compressors 2, the oil that the refrigerant that spued from 2 grades of oil-cooled type screw compressors 2 by oily separation recoverer 3 is separated via the oil that is folded with oil cooler 29 supply with stream 30, by the pressure feed that spues of 2 grades of oil-cooled type screw compressors 2.
The oil that is fed into the bearing 21 of suction side is drawn in the 1st grade of rotor chamber 11 together with refrigerant, be fed into the oil of the bearing 22 being configured in intermediate pressure space 18 by being drawn into the 2nd grade of rotor chamber 13 from middle pressure space 18 together with refrigerant, finally spued together with refrigerant from discharge opening 20.On the other hand, the oil that is fed into the bearing 23 of exhaust end is discharged stream 31 at the 1st grade of interior delimitation of rotor chamber 11, oil from the compression volume that suction port 16 and discharge opening 17 are isolated and is discharged to the compression volume of the 1st grade of screw compression portion 8 via being communicated to the 1st grade of screw rotor 12.
If explained, be used for bearing 23 to supply with stream 30 at the 2nd grade of rotor chamber 13 of the 2nd grade of 9(of screw compression portion for the oil of oil supply) the end face of exhaust end and bearing 23 between opening.In addition, oil discharge stream 31 bearing 23 with the 2nd grade of side opening that screw compression portion 9 is contrary.The oil that, is fed into bearing 23 crosses bearing 23 and flows out from the 2nd grade of screw compression portion 9 side.Therefore, the oil of the 2nd of bearing 23 the grade of screw compression portion 9 sides has than the pressure of the pressure loss amount of the innage bearing 23 of the 2nd grade of screw compression portion 9 opposition sides of bearing 23.
In Fig. 2, represent scope in 2 grades of oil-cooled type screw compressors 2, that can get as the suction pressure Ps of the refrigerant pressure of the suction port 16 of the 1st grade of screw compression portion 8, as the intermediate pressure Pm of the interior pressure in intermediate pressure space 18 and as the pressure P d that spues of the refrigerant pressure of the discharge opening 20 of the 2nd grade of screw compression portion 9.
The pressure P that spues d is consistent with the condensing pressure of condenser 4, but according to the chilling temperature of condenser 4 (CT), line L1 in the drawings changes between line L2.The transverse axis of figure is the evaporating temperature of the refrigerant in vaporizer 6, but because the suction pressure Ps of 2 grades of oil-cooled type screw compressors 2 exists with ... evaporating temperature as illustrated, changes so L3 is upper online.In addition,, in 2 grades of oil-cooled type screw compressors 2, because the mechanical compression ratio of the 1st grade of screw compression portion 8 is certain, so intermediate pressure Pm exists with ... suction pressure Ps, L4 is upper online changes along with evaporating temperature.Oil is discharged the pressure P of stream 31
31due to be the 2nd grade of screw compression portion 9 compression midway a bit, so along with evaporating temperature, move on the low line L5 of the line L4 than intermediate pressure Pm.
As shown in the figure, in 2 grades of oil-cooled type screw compressors 2, oil is discharged the pressure P of stream 31
31with compared with the pressure P d that spues enough low pressure pass.Thereby, oil discharge stream 31 and the oil with the pressure of the pressure P d that equals to spue supply with between stream 30 and always there is enough pressure differences.Thus, even if consider the pressure loss in bearing 23, by the oil that bearing 23 is supplied with being discharged successively, new cooling oil can being supplied on bearing 23, can prevent the damage of bearing 23.In addition the oil of, bearing 23 being supplied with is also as the fluid-encapsulated performance function of the shaft seal in the seal construction between auxiliary the 2nd grade of screw compression portion 9 and bearing 23.
Claims (3)
1. 2 grades of screw compression formula refrigerating plants, are the 1st grade of screw compression portion and the 2nd grade of 2 grades of screw compression formula refrigerating plants that screw compression portion compresses refrigerant by being connected in series, and it is characterized in that possessing:
Oil is supplied with stream, and the bearing of the exhaust end to above-mentioned the 2nd grade of screw compression portion is for oil supply;
Oil is discharged stream, and the compression volume by above-mentioned oil from above-mentioned bearing to above-mentioned the 1st grade of screw compression portion is discharged;
Oil is discharged stream the compression volume of the bearing of the exhaust end of the 2nd grade of screw compression portion and the 1st grade of screw compression portion is communicated with.
2. 2 grades of screw compression formula refrigerating plants as claimed in claim 1, is characterized in that,
Above-mentioned oil is supplied with stream opening between the end face of the exhaust end of above-mentioned the 2nd grade of screw compression portion and above-mentioned bearing;
Above-mentioned oil is discharged stream at above-mentioned bearing and above-mentioned the 2nd grade of side opening that screw compression portion is contrary.
3. 2 grades of screw compression formula refrigerating plants as claimed in claim 1 or 2, is characterized in that,
In the refrigerant circulation stream of the exhaust end of above-mentioned the 2nd grade of helical-lobe compressor, be folded with oily separation recoverer, the oil after separating be supplied to above-mentioned oil supply with in stream in above-mentioned oily separation recoverer.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011-029625 | 2011-02-15 | ||
| JP2011029625A JP5844980B2 (en) | 2011-02-15 | 2011-02-15 | Two-stage screw compression refrigeration system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102635551A CN102635551A (en) | 2012-08-15 |
| CN102635551B true CN102635551B (en) | 2014-11-12 |
Family
ID=46620081
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210032345.6A Active CN102635551B (en) | 2011-02-15 | 2012-02-14 | Two-stage screw compression type freezing device |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP5844980B2 (en) |
| KR (1) | KR101330332B1 (en) |
| CN (1) | CN102635551B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5714479B2 (en) * | 2011-12-26 | 2015-05-07 | 株式会社神戸製鋼所 | Oil-cooled two-stage compressor and heat pump |
| WO2018135444A1 (en) * | 2017-01-17 | 2018-07-26 | 株式会社神戸製鋼所 | Oil-cooled screw compressor |
| CN114484929B (en) * | 2021-12-28 | 2024-03-12 | 中国航天空气动力技术研究院 | Dual-unit combined refrigerating system and method for environment simulation cabin |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07260263A (en) * | 1994-03-17 | 1995-10-13 | Sanyo Electric Co Ltd | Device for two-stage compression refrigeration |
| CN101218433A (en) * | 2005-06-29 | 2008-07-09 | 株式会社前川制作所 | Oil supply method and device for two-stage screw compressor, and method of operating refrigeration device |
| CN100532998C (en) * | 2004-09-02 | 2009-08-26 | 大金工业株式会社 | Refrigerating apparatus |
| CN101644501A (en) * | 2008-08-08 | 2010-02-10 | 株式会社神户制钢所 | Refrigerating device |
| CN1690590B (en) * | 2004-04-27 | 2010-05-26 | 株式会社神户制钢所 | Two-stage screw bolt refrigerating machine |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0674173A (en) * | 1992-08-25 | 1994-03-15 | Kobe Steel Ltd | Two-stage oil cooled compressor |
| JP3535938B2 (en) * | 1996-02-02 | 2004-06-07 | 株式会社神戸製鋼所 | Two-stage screw compressor |
| JP2000337282A (en) * | 1999-05-26 | 2000-12-05 | Kobe Steel Ltd | Two-stage type screw compressor |
| JP4559283B2 (en) | 2004-04-27 | 2010-10-06 | 株式会社神戸製鋼所 | 2-stage screw refrigerator |
| JP5300727B2 (en) * | 2007-08-28 | 2013-09-25 | 三菱電機株式会社 | Rotary compressor |
-
2011
- 2011-02-15 JP JP2011029625A patent/JP5844980B2/en active Active
-
2012
- 2012-01-13 KR KR1020120004402A patent/KR101330332B1/en active IP Right Grant
- 2012-02-14 CN CN201210032345.6A patent/CN102635551B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07260263A (en) * | 1994-03-17 | 1995-10-13 | Sanyo Electric Co Ltd | Device for two-stage compression refrigeration |
| CN1690590B (en) * | 2004-04-27 | 2010-05-26 | 株式会社神户制钢所 | Two-stage screw bolt refrigerating machine |
| CN100532998C (en) * | 2004-09-02 | 2009-08-26 | 大金工业株式会社 | Refrigerating apparatus |
| CN101218433A (en) * | 2005-06-29 | 2008-07-09 | 株式会社前川制作所 | Oil supply method and device for two-stage screw compressor, and method of operating refrigeration device |
| CN101644501A (en) * | 2008-08-08 | 2010-02-10 | 株式会社神户制钢所 | Refrigerating device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP5844980B2 (en) | 2016-01-20 |
| CN102635551A (en) | 2012-08-15 |
| KR101330332B1 (en) | 2013-11-15 |
| JP2012167608A (en) | 2012-09-06 |
| KR20120101296A (en) | 2012-09-13 |
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| C06 | Publication | ||
| PB01 | Publication | ||
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| C14 | Grant of patent or utility model | ||
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| TR01 | Transfer of patent right |
Effective date of registration: 20220301 Address after: Tokyo, Japan Patentee after: Shengang Compressor Co.,Ltd. Address before: Kobe City, Hyogo Prefecture, Japan Patentee before: Kobe Steel, Ltd. |
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| TR01 | Transfer of patent right |