CN101871720A - Liquid nitrogen freeze dryer direct-expansion cold trap - Google Patents
Liquid nitrogen freeze dryer direct-expansion cold trap Download PDFInfo
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- CN101871720A CN101871720A CN 201010198611 CN201010198611A CN101871720A CN 101871720 A CN101871720 A CN 101871720A CN 201010198611 CN201010198611 CN 201010198611 CN 201010198611 A CN201010198611 A CN 201010198611A CN 101871720 A CN101871720 A CN 101871720A
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- coil pipe
- liquid nitrogen
- freeze dryer
- cold trap
- tubulation
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Abstract
The invention discloses a liquid nitrogen freeze dryer direct-expansion cold trap. A cold trap box body is provided with a vacuum pumping port, a middle separation valve, a liquid nitrogen inlet and a nitrogen gas outlet, wherein a coiler fixed bracket and a coiler are arranged inside the box body, a convergence cavity, a tube nest and a convergence tube are also arranged inside the box body, the lower part of the tube nest is connected with the convergence tube, the upper part thereof is connected with the convergence cavity, the coiler is divided into an upper coiler and a lower coiler, an upper coiler inlet is directly connected with the convergence cavity, a lower coiler inlet is connected with a bushing on the tube nest, the convergence tube is connected with the liquid nitrogen inlet, and a nitrogen gas discharging pipe which is connected with the nitrogen gas outlet is lead out from the middle part of the upper and the lower coilers. The liquid nitrogen freeze dryer direct-expansion cold trap enlarges the freezing temperature range, and can improve the temperature homogeneity and heat exchanging efficiency of the cold trap.
Description
Technical field
The present invention relates to a kind of freeze dryer cold-trap, relate in particular to a kind of liquid nitrogen freeze dryer direct-expansion cold trap.
Background technology
The case chamber of vacuum freeze drier (abbreviation freeze dryer) is divided into freeze drying box and cold-trap two parts.Parts such as flaggy are arranged in the freeze drying box, mainly are to place freeze-dried products; Parts such as coil pipe are arranged in the cold-trap, mainly are that the solvent that will distil out in the goods freezes once more.
Freeze dryer cold-trap refrigeration modes mainly is divided into direct refrigeration and indirect refrigeration.Directly refrigeration mainly is that freon liquid enters in the coil pipe and vaporizes, absorb heat, this refrigerating method makes in the cold-trap that the temperature ladder of section is fairly obvious before and after the coil pipe, also skewness when the uneven solvent that makes distillation come of the temperature of coil pipe freezes once more, and the area that effectively utilizes of coil pipe reduces.Adopt the freon cold-trap that directly freezes, the cold-trap limiting temperature is more than or equal to-75 ℃, and the super operating mode of compressor this moment moves very unstablely, and this temperature can't be with the organic solvent freeze-drying.Indirect refrigeration mainly is that vaporization is with refrigerating medium (silicone oil) refrigeration in freon or the liquid nitrogen elder generation heat exchanger externally, and silicone oil enters in the coil pipe again, with coil pipe and cold-trap cooling.There is not phase transformation in indirect refrigeration because utilize refrigerating medium that cold is passed in the cold-trap in cold-trap, so temperature homogeneity is good, but this makes system effectiveness reduce, and energy consumption increases, and the cold-trap limiting temperature is subjected to the restriction of conduction oil character simultaneously.The conduction oil limiting temperature that is fit to the freeze dryer use at present is-80 ℃, so the method still can't be tested the organic solvent freeze-drying.
Summary of the invention
Technical problem to be solved by this invention provides a kind of liquid nitrogen freeze dryer direct-expansion cold trap, enlarges freezing temperature range, and improves the temperature homogeneity and the heat exchange efficiency of cold-trap.
The present invention solves the problems of the technologies described above the technical scheme that adopts to provide a kind of liquid nitrogen freeze dryer direct-expansion cold trap, described cold-trap casing is provided with vacuum orifice, in every valve, the liquid nitrogen inlet, nitrogen outlet, be provided with coil pipe fixed mount and coil pipe in the described casing, wherein, collection chamber also is set in the described casing, tubulation and manifold trunk, described tubulation bottom links to each other with manifold trunk, top links to each other with collection chamber, described coil pipe is divided into coil pipe and lower coil pipe, the described coil pipe inlet of going up directly is connected with collection chamber, described lower coil pipe inlet is connected with sleeve pipe on the tubulation, described manifold trunk links to each other with the liquid nitrogen inlet, and the nitrogen discharge pipe that links to each other with nitrogen outlet is drawn at the coil pipe middle part up and down.
Above-mentioned liquid nitrogen freeze dryer direct-expansion cold trap, wherein, described upward coil pipe and lower coil pipe are made up of some coil pipes respectively, are provided with flow distribution plate around it.
Above-mentioned liquid nitrogen freeze dryer direct-expansion cold trap, wherein, described collection chamber place is provided with the minute-pressure safety valve and is used for the first pressure connector of setting pressure transmitter, and described manifold trunk place is provided with and is used for the setting pressure transmitter second pressure connector.
Above-mentioned liquid nitrogen freeze dryer direct-expansion cold trap wherein, is provided with fin in described coil pipe and the tubulation.
The present invention contrasts prior art following beneficial effect: liquid nitrogen freeze dryer direct-expansion cold trap provided by the invention, by collection chamber, tubulation and manifold trunk are set, and coil pipe is divided into coil pipe and lower coil pipe, discharge after being dispensed to coil pipe after making liquid nitrogen in tubulation, vaporize, enlarge freezing temperature range, and improve the temperature homogeneity and the heat exchange efficiency of cold-trap.In addition, liquid nitrogen freeze dryer direct-expansion cold trap provided by the invention is provided with fin by flow distribution plate is set in coil pipe and tubulation, further improved temperature homogeneity and heat exchange efficiency.
Description of drawings
Fig. 1 is a liquid nitrogen freeze dryer direct-expansion cold trap structural representation of the present invention;
Fig. 2 is the coil pipe and the tubulation enlarged diagram of liquid nitrogen freeze dryer direct-expansion cold trap of the present invention.
Among the figure:
1 casing, 2 heat-insulation layers, 3 hangers
4 access holes, 5 vacuum ports, 6 minute-pressure safety valves
7 collection chambers, 8 first pressure connectors, 9 tubulations
In 10 every valve 11 second pressure connectors 12 manifold trunks
13 liquid nitrogen, 14 coil pipes, 15 dewatering outlets that enter the mouth
16 nitrogen outlets, 17 coil pipe fixed mounts, 18 legs
Coil pipe on 19 flow distribution plates, 21 fins 141
142 lower coil pipes
The specific embodiment
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is a liquid nitrogen freeze dryer direct-expansion cold trap structural representation of the present invention; Fig. 2 is the coil pipe and the tubulation enlarged diagram of liquid nitrogen freeze dryer direct-expansion cold trap of the present invention.
See also Fig. 1 and 2, liquid nitrogen freeze dryer direct-expansion cold trap of the present invention comprises that cold-trap casing 1 is provided with vacuum orifice 5, in every valve 10, liquid nitrogen inlet 13 and nitrogen outlet 16, be provided with coil pipe fixed mount 17 and coil pipe 14 in the described casing 1, wherein, in the described casing 1 collection chamber 7 is set also, tubulation 9 and manifold trunk 12, described tubulation 9 bottoms link to each other with manifold trunk 12, top links to each other with collection chamber 7, described coil pipe 14 is divided into coil pipe 141 and lower coil pipe 142, described coil pipe 141 inlets of going up directly are connected with collection chamber 7, described lower coil pipe 142 inlets are connected with sleeve pipe on the tubulation 9, described manifold trunk 12 links to each other with liquid nitrogen inlet 13, and the nitrogen discharge pipe that links to each other with nitrogen outlet 16 is drawn at the coil pipe middle part up and down.
Above-mentioned cold-trap directly enters sweat cooling in the casing by liquid nitrogen, and the low temperature nitrogen in tubulation 9 after the vaporization compiles in collection chamber 7 once more, evenly divides then to coil pipe 14, and limiting temperature can be low to moderate below-130 ℃.Being dispensed to coil pipe 14 backs after liquid nitrogen freeze dryer direct-expansion cold trap of the present invention makes liquid nitrogen vaporize in tubulation 9 discharges, the coil pipe of low temperature will flow through its surperficial steam with tubulation catches into ice or frost, and coil pipe 14 is divided into up and down two parts, reduced coil lengths, and last coil pipe 141 is directly introduced low temperature nitrogen by collection chamber 7, lower coil pipe 142 is introduced low temperature nitrogen by the chuck on the tubulation, has guaranteed that coil pipe inlet nitrogen temperature is identical, has finally guaranteed the temperature homogeneity of coil pipe.
Above-mentioned liquid nitrogen freeze dryer direct-expansion cold trap, wherein, described upward coil pipe 141 and lower coil pipe 142 are made up of some coil pipes respectively, can further be provided with flow distribution plate 19 around it.Flow distribution plate 19 is evenly assigned to coil pipe everywhere with air-flow, and sets up local depression by vavuum pump in the casing centre, makes the while of coil pipe frosting everywhere and even.
Above-mentioned liquid nitrogen freeze dryer direct-expansion cold trap, wherein, described collection chamber 7 places can also be provided with minute-pressure safety valve 6 and be used for the first pressure connector 8 of setting pressure transmitter, and described manifold trunk 7 places are provided with and are used for the setting pressure transmitter second pressure connector 11.Close when coil pipe takes place to leak for the nitrogen valve, the minute-pressure safety valve is guaranteed no malleation in the case, thereby can guarantee the safety of cold-trap.
Above-mentioned liquid nitrogen freeze dryer direct-expansion cold trap, vacuum port 5 is connected to vavuum pump, by vavuum pump the incoagulable gas in the casing is extracted out, and is formed low pressure point in the casing center, guarantees the flow direction of air-flow.In will be connected with freeze drying box every valve 10, by in every the UNICOM and the disconnection of the switch of valve 10 control freeze drying box and cold-trap.Central when valve 10 is opened, the water vapour in the freeze drying box flows in the cold-trap by pressure reduction.Steam behind valve 10, is evenly distributed to each orientation by flow distribution plate 9 with steam in flowing through, steam is being sublimated into ice or frost through tubulation 9 during with coil pipe 14 then, and incoagulable gas arrives the middle part low pressure point and extracted out by vavuum pump.
For convenient for maintaining when inner coil pipe breaks down, casing 1 can be provided with access hole 4 and visor.In addition, can be provided with heat-insulation layer 2, hanger 3, dewatering outlet 15, leg 18 outside the casing 1.On tubulation 9, pressure transmitter, liquid level gauge and temp probe can also be installed, so that for PLC or other host computers provide feedback signal, the temperature in the control cold-trap.Tubulation place temperature is minimum in casing, equals liquid nitrogen temperature.The arbitrary value of Controllable Temperature in the allowable temperature scope in the coil pipe.
The concrete installation of liquid nitrogen freeze dryer direct-expansion cold trap of the present invention is as follows: at first spiral coil 14 is fixed on the coil pipe fixed mount 17, spiral coil 14 is divided into two groups up and down, is respectively coil pipe 141 and lower coil pipe 142.Coil pipe is formed by some coil pipes up and down, coil pipe is formed by 5 coil pipes about among Fig. 2, and the low temperature nitrogens in the last coil pipe 141 enter from top, imports the nitrogen discharge pipe by the bottom and discharges, low temperature nitrogen in the lower coil pipe 142 enters from the bottom, imports the nitrogen discharge pipe by top and discharges.The nitrogen discharge pipe extends bottom half at last by drawing in the middle part of the coil pipe up and down, and nitrogen outlet adopts flange to connect.
Outside coil pipe, the bottom fixes manifold trunk 12, some tubulations 9 that evenly distribute on the manifold trunk 12, and many tubulations adopt the mode of chuck to link to each other, and the bottom of manifold trunk 12 links to each other with liquid nitrogen inlet 13.The fin 21 that strengthens heat exchange all is installed in all coil pipes 14 and the tubulation 9.Liquid nitrogen flows into back uniform distribution manifold trunk 12 from inlet and absorb the heat vaporization in tubulation 9 to tubulation 9.
Coil pack assembles, and is fit in the casing 1 after the assay was approved again.Also installation in position of remaining part on the casing simultaneously.Coil pack is connected tubulation 9 after putting into casing 1 with collection chamber 7, last coil pipe 141 inlets directly are connected with collection chamber 7, and lower coil pipe 142 enters the mouth and is connected with sleeve pipe on the tubulation 9.Low temperature nitrogen in tubulation after the vaporization compiles in collection chamber 7 once more, evenly divides to coil pipe 14 then.Last coil pipe 141 is directly introduced low temperature nitrogen by the inlet that is attached thereto, and lower coil pipe 142 is far away because introduce the nitrogen distance, wherein passes through the thermic load district again, so cause the lower coil pipe inlet by the sleeve pipe on the tubulation 9.Because there is liquid nitrogen in the tubulation, can continue cooling to the nitrogen of flowing through, so said structure can make the inlet temperature basically identical of coil pipe up and down, guarantee the temperature homogeneity at coil pipe place.
Though the present invention discloses as above with preferred embodiment; right its is not in order to qualification the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when can doing a little modification and perfect, so protection scope of the present invention is when with being as the criterion that claims were defined.
Claims (4)
1. liquid nitrogen freeze dryer direct-expansion cold trap, described cold-trap casing (1) is provided with vacuum orifice (5), in every valve (10), liquid nitrogen inlet (13), nitrogen outlet (16), be provided with coil pipe fixed mount (17) and coil pipe (14) in the described casing (1), it is characterized in that, collection chamber (7) also is set in the described casing (1), tubulation (9) and manifold trunk (12), described tubulation (9) bottom links to each other with manifold trunk (12), top links to each other with collection chamber (7), described coil pipe (14) is divided into coil pipe (141) and lower coil pipe (142), described coil pipe (141) inlet of going up directly is connected with collection chamber (7), described lower coil pipe (142) inlet is connected with sleeve pipe on the tubulation (9), described manifold trunk (12) links to each other with liquid nitrogen inlet (13), and the nitrogen discharge pipe that links to each other with nitrogen outlet (16) is drawn at the coil pipe middle part up and down.
2. liquid nitrogen freeze dryer direct-expansion cold trap as claimed in claim 1 is characterized in that, described upward coil pipe (141) and lower coil pipe (142) are made up of some coil pipes respectively, are provided with flow distribution plate (19) around it.
3. liquid nitrogen freeze dryer direct-expansion cold trap as claimed in claim 1 or 2, it is characterized in that, described collection chamber (7) is located to be provided with minute-pressure safety valve (6) and is used for the first pressure connector (8) of setting pressure transmitter, and described manifold trunk (12) is located to be provided with and is used for the setting pressure transmitter second pressure connector (11).
4. liquid nitrogen freeze dryer direct-expansion cold trap as claimed in claim 1 or 2 is characterized in that, is provided with fin (21) in described coil pipe (14) and the tubulation (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010198611 CN101871720B (en) | 2010-06-11 | 2010-06-11 | Liquid nitrogen freeze dryer direct-expansion cold trap |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010198611 CN101871720B (en) | 2010-06-11 | 2010-06-11 | Liquid nitrogen freeze dryer direct-expansion cold trap |
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| Publication Number | Publication Date |
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| CN101871720A true CN101871720A (en) | 2010-10-27 |
| CN101871720B CN101871720B (en) | 2011-11-30 |
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| CN 201010198611 Active CN101871720B (en) | 2010-06-11 | 2010-06-11 | Liquid nitrogen freeze dryer direct-expansion cold trap |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103571978A (en) * | 2013-11-12 | 2014-02-12 | 南通思瑞机器制造有限公司 | Working platen of leather vacuum drier |
| CN103599643A (en) * | 2013-11-25 | 2014-02-26 | 北京卫星环境工程研究所 | Vacuum insulation liquid-storage type liquid nitrogen cold trap |
| CN105300036A (en) * | 2015-11-12 | 2016-02-03 | 上海东富龙科技股份有限公司 | Horizontal condenser |
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| SU346557A1 (en) * | Л. Л. Гении, Л. И. Мак, С. Ф. Варзар , В. Ф. Ковалев | CONDENSER-EVAPORATOR | ||
| SU966453A1 (en) * | 1981-04-10 | 1982-10-15 | Специальное конструкторско-технологическое бюро по высоковольтной и криогенной технике Мосэнерго | Condenser-evaporator |
| CN2051444U (en) * | 1989-07-13 | 1990-01-24 | 湖南省临澧县太平机械修造厂 | Direct cooling type automatic ice-pool for processing frozen suckling pigs |
| US5555734A (en) * | 1993-03-30 | 1996-09-17 | Maximicer | Method for reducing sediment precipitation on heat exchangers such as water prechillers for ice machines |
| US5820641A (en) * | 1996-02-09 | 1998-10-13 | Mks Instruments, Inc. | Fluid cooled trap |
| US6895774B1 (en) * | 2004-05-25 | 2005-05-24 | Roland Ares | Refrigerated air drier with dehumidification of both the low pressure and the high pressure air |
| CN101059303A (en) * | 2006-04-21 | 2007-10-24 | 北美冻干技术股份公司 | Plate type cold trap for freeze-dryer |
| CN201138106Y (en) * | 2007-12-24 | 2008-10-22 | 上海东富龙科技股份有限公司 | Liquid heat exchanger for liquid heat assisted refrigerating and freeze-drying apparatus |
| CN101403562A (en) * | 2008-11-14 | 2009-04-08 | 兰州科近真空冻干技术有限公司 | Cold trap used for vacuum freeze-drying apparatus |
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2010
- 2010-06-11 CN CN 201010198611 patent/CN101871720B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU346557A1 (en) * | Л. Л. Гении, Л. И. Мак, С. Ф. Варзар , В. Ф. Ковалев | CONDENSER-EVAPORATOR | ||
| SU966453A1 (en) * | 1981-04-10 | 1982-10-15 | Специальное конструкторско-технологическое бюро по высоковольтной и криогенной технике Мосэнерго | Condenser-evaporator |
| CN2051444U (en) * | 1989-07-13 | 1990-01-24 | 湖南省临澧县太平机械修造厂 | Direct cooling type automatic ice-pool for processing frozen suckling pigs |
| US5555734A (en) * | 1993-03-30 | 1996-09-17 | Maximicer | Method for reducing sediment precipitation on heat exchangers such as water prechillers for ice machines |
| US5820641A (en) * | 1996-02-09 | 1998-10-13 | Mks Instruments, Inc. | Fluid cooled trap |
| US6895774B1 (en) * | 2004-05-25 | 2005-05-24 | Roland Ares | Refrigerated air drier with dehumidification of both the low pressure and the high pressure air |
| CN101059303A (en) * | 2006-04-21 | 2007-10-24 | 北美冻干技术股份公司 | Plate type cold trap for freeze-dryer |
| CN201138106Y (en) * | 2007-12-24 | 2008-10-22 | 上海东富龙科技股份有限公司 | Liquid heat exchanger for liquid heat assisted refrigerating and freeze-drying apparatus |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103571978A (en) * | 2013-11-12 | 2014-02-12 | 南通思瑞机器制造有限公司 | Working platen of leather vacuum drier |
| CN103571978B (en) * | 2013-11-12 | 2016-01-20 | 南通思瑞机器制造有限公司 | A kind of leather vacuum drier working plate |
| CN103599643A (en) * | 2013-11-25 | 2014-02-26 | 北京卫星环境工程研究所 | Vacuum insulation liquid-storage type liquid nitrogen cold trap |
| CN103599643B (en) * | 2013-11-25 | 2015-10-21 | 北京卫星环境工程研究所 | Vacuum insulation liquid-storage type liquid nitrogen cold trap |
| CN105300036A (en) * | 2015-11-12 | 2016-02-03 | 上海东富龙科技股份有限公司 | Horizontal condenser |
| CN105300036B (en) * | 2015-11-12 | 2017-09-22 | 上海东富龙科技股份有限公司 | A kind of horizontal condenser |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101871720B (en) | 2011-11-30 |
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Address after: 201109 Shanghai city Minhang District Fanghe Road No. 2199 Patentee after: Dongfulong Technology Group Co.,Ltd. Address before: 201109 Shanghai city Minhang District Fanghe Road No. 2199 Patentee before: SHANGHAI TOFFLON SCIENCE AND TECHNOLOGY Co.,Ltd. |