CN2932261Y - Water catching system of vacuum freeze drying machine - Google Patents
Water catching system of vacuum freeze drying machine Download PDFInfo
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- CN2932261Y CN2932261Y CN 200620112961 CN200620112961U CN2932261Y CN 2932261 Y CN2932261 Y CN 2932261Y CN 200620112961 CN200620112961 CN 200620112961 CN 200620112961 U CN200620112961 U CN 200620112961U CN 2932261 Y CN2932261 Y CN 2932261Y
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Abstract
A water collection system for vacuum freeze-drying machine comprises two water collection equipments provided in a drying chamber, a set of subatmospheric steam defrosting device and the connecting pipe thereof, and a valve, and is characterized in that the water collection equipments comprise a chamber body (1), a cold pipe or a cold plate set (2) and a vacuum valve (3), a section which is far from the chamber door (22) of the drying chamber(21) is separated by a partition (23) into a left chamber and a right chamber as the chamber body (1) of the two water collection equipments, wherein the cold pipe or the cold plate set(2) is positioned in the chamber body (1) and the vacuum valve (3) is positioned at the connection of the chamber body (1) and the drying chamber (21). One terminal which is far away from the drying chamber (21) on the chamber body (1) of the two water collection equipments is respectively provided with a hollow pipe (18) which is communicated with vacuum machine sets through two vacuum valves (19).The utility model is capable of increasing the production efficiency of the freeze-drying machine, lowing down the consumption of production, saving energy, and improving the sanitary grade and quality of the production.
Description
Technical field
The utility model relates to water (also the claiming cold-trap) system of catching of a kind of vacuum freeze drier (abbreviation freeze dryer), particularly a kind of vacuum freeze drier.
Background technology
Vacuum freeze drying (also claiming freeze-drying) method is earlier water-containing materials to be frozen into below the eutectic temperature, make free water wherein become ice, then, under suitable temperature and vacuum, ice distillation (adsorbed water evaporation) is overflowed from material for steam, utilize water vessel that steam is sublimated, thereby obtain the technology of dried product.During freeze dryer work, the vacuum in the dryness storehouse is obtained by vacuum system, and vacuum system mainly is made up of vacuum unit and water vessel.In dry run, the a large amount of steam that produce are depended merely on the vacuum unit and can't all be discharged outside the storehouse, and the vacuum unit only is used to extract out not condensable gas, must rely on cold-trap (water vessel) that steam is captured, make on its surface and sublimate into ice (or frost), just can keep corresponding vacuum.
The dry run of freeze-drying divides distillation dry and two processes of adsorption stripping and dry, lyophilization is in the distillation mode frozen free water all to be sloughed, in the lyophilization process, vacuum pressure in the dryness storehouse should be lower than the corresponding water saturation vapour pressure of material eutectic temperature, otherwise the ice crystal in the material will melt, not not lyophilization just also, because being the ice in the material, the lyophilization process is sublimed into steam, steam is sublimated into the process of ice again on the water vessel surface, there are how many distillation amounts that how much the amount of sublimating is just arranged, it is identical with the latent heat of sublimating to distil, therefore, the cold that has only water vessel to be actually used in to sublimate equals to be used to distil when adding heat, just can keep needed stable vacuum pressure.That is to say that water vessel be except having enough surface areas, when distillation (also be maximum) needed cold when also wanting to provide maximum and sublimating.Under certain condition, the cooling ability of water vessel is determining distillation amount and rate of sublimation.Adsorption stripping and dry is that part of moisture that does not freeze (title adsorbed water) that will adsorb on material capillary wall and the polarity gene is removed, to guarantee the better quality of freeze-dried products.Because the absorption energy of adsorbed water is higher, must make material inside and outside form bigger steam pressure difference, branch water is overflowed, so, should reduce the vacuum pressure in the dryness storehouse as far as possible, promptly should reduce the surface temperature of water vessel as far as possible.In the adsorption stripping and dry stage, the face of sublimating in the water vessel (frost layer outer surface) temperature is low more, and vacuum pressure (strictness says it is the dividing potential drop of steam) is also low more in the dryness storehouse, and adsorption stripping and dry speed is fast more, and the residual water content of dried frozen aquatic products is low more, and quality is good more.The performance that this shows water-trapping system directly influences production efficiency of freeze-drying machine, energy consumption and product quality.
Existing freeze dryer dryness storehouse has two kinds of water-trapping system configurations of single, double water vessel.A single water vessel configuration i.e. dryness storehouse is joined a water vessel and (is comprised external, rear-mounted and underneath type), water vessel does not defrost in whole arid cycle, ice on the cold pipe of water vessel (or plate) outer surface or frost (below be referred to as frost) layer, carrying out with freeze-drying process can be tied thicker and thicker, frost is the non-conductor of heat, thickening of frost layer, heat transmission resistance is increased, the temperature difference between the cold outer surface of tube wall of water vessel and the face of sublimating (frost layer outer surface) strengthens, identical surface temperature and the cold of sublimating is provided, certainly will will reduce the evaporating temperature or the refrigerant temperature of refrigeration working medium in the cold tube wall of water vessel, strengthen refrigerating capacity simultaneously, and that refrigeration compressor is an evaporating temperature is low more, Energy Efficiency Ratio is low more, this shows, because thickening of frost layer increased the energy consumption of refrigeration compressor.On the other hand, in the adsorption stripping and dry stage, the frost layer has been tied very thick, and the temperature of the face of sublimating is difficult to fall very lowly, is unfavorable for the effusion of adsorbed water in the material, and adsorption stripping and dry speed can be very slow, and influence the freeze-dried products quality.In order to overcome the too thick harmful effect that produces of frost layer, this class freeze dryer is all done the cold pipe area of water vessel very big usually.Because water vessel is big, cause cold pipe temperature non to strengthen, the flow resistance of refrigeration working medium or refrigerant strengthens, and energy consumption increases, and manufacturing cost increases.Moreover water vessel can only finish in freeze-drying, defrosts after material delivers from godown (comprising draining and cooling again), makes the long-time standby of freeze dryer, the production cycle lengthening.Therefore this class freeze dryer energy consumption is higher, and production efficiency is lower.
Two water vessel configurations, promptly a dryness storehouse is joined two water vessels, this class freeze dryer is divided into two kinds by the water vessel installation site, and wherein a kind of is underneath type, and promptly two water vessels are located at below the interior heating plate group of dryness storehouse, two water vessel storehouses are communicated with dryness storehouse locates the mobile board-like valve of a shared cover, though this freeze dryer is that two water vessels are arranged, and can reality alternately catch water, alternately defrosting, overcome the deficiency that single water vessel configuration brings because of white bed thickness, but mostly two water vessels can not be worked simultaneously.At the early stage of drying, steam distillation amount is very big, can not come into operation by two water vessels, certainly will cause and effectively catch the water area deficiency, and the maximum amount of sublimating is restricted during the frosting bed thickness, therefore, can only rely on repeatedly alternately defrosting to satisfy and catch the water requirement in a large number.If big water vessel is repeatedly from being raised to below-30 ℃ more than 0 ℃, from dropping to more than 0 ℃ below-30 ℃, energy consumption must strengthen again.Main is underneath type water vessel and storehouse section of heating plate coexistence, and a cold high temperature field is interfered mutually, and energy loss is bigger, because the counteracting of hot and cold energy, material heat intensity near water vessel reduces, and dry materials speed is inconsistent, makes lengthening drying time in whole storehouse.On the other hand, freeze-dried material is positioned at the water vessel top, when freeze-drying finishes to remove vacuum, because of freeze-dried material is very light, very easily fall in the water vessel and upper surface, because the space is little, valve rod mechanism complexity is not easy to clean very much, is difficult to satisfy the high freeze-dried products production requirement of hygienic requirements.
The water-trapping system that also has the two water vessels of a kind of external in addition, promptly two water vessels are located at outside the dryness storehouse, and two water vessel storehouses adopt pipeline and valve to be communicated with dryness storehouse.This freeze dryer, catch water though can realize two water vessels simultaneously at the early stage of drying, the freeze-drying later stage also can be caught water and alternately defrosting separately by the separate unit water vessel, overcome the deficiency that single water vessel configuration brings because of white bed thickness, no cold, thermal energy is offset the energy loss that is caused, dryness storehouse is easy to clean and sterilization, but because the pipeline between water vessel storehouse and the dryness storehouse is long, caliber is little, and bend is many, reducing is big, increased the flow resistance of steam from dryness storehouse to the water vessel storehouse greatly, in order to reach the identical water effect of catching, temperature that certainly will the demand water vessel is lower, refrigeration compressor is more powerful, and the refrigeration system power consumption is higher.Be subjected to the influence of structure simultaneously, the freeze dryer of the two water vessels of external takes up room bigger, the manufacturing cost height.
The utility model content
The purpose of this utility model is to provide a kind of water-trapping system of vacuum freeze drier, to solve above-mentioned the deficiencies in the prior art.Adopt the utility model can improve production efficiency of freeze-drying machine, reduce to produce consuming, improve product health grade and quality.
The technical scheme that realizes above-mentioned purpose and take is: the water-trapping system of the utility model vacuum freeze drier comprises two water vessels, a cover negative pressure steam defroster and connecting pipe thereof, the valve that is arranged in the dryness storehouse, and it is characterized in that: described water vessel comprises warehouse, cold pipe or cold drawing group (hereinafter to be referred as cold pipe group) and vacuum valve; With two Room about the separating and be divided into partition wall of described dryness storehouse, as the warehouse of described two water vessels away from a section of door; Described cold pipe group is positioned at described warehouse, and described vacuum valve is positioned at the place that is communicated with of described warehouse and dryness storehouse.
Described cold pipe group is the evaporimeter that refrigeration working medium evaporates direct cooling, or the heat exchanger of the indirect cooling of refrigerant.
Two described cold Guan Zujun are connected with refrigeration system by pipeline, pipeline.
The lower bottom part of two described water vessel warehouses respectively is provided with a defrosting discharge outlet, and two described defrosting discharge outlet are connected by the interface of two vacuum valves, pipeline and described negative pressure steam defroster housings.
Described negative pressure steam defroster comprises housing, heat exchanger, fluid level controller, pump, and described heat exchanger is positioned at housing, and the one end is connected by pipeline, magnetic valve and vapour source; Its other end communicates with drainage network or recovery system.
On the warehouse of two described water vessels, respectively be provided with an evacuation tube, and connect with pipeline and vacuum unit by two vacuum valves.
Described evacuation tube preferably is located at the end away from dryness storehouse on the warehouse.
The utility model water-trapping system is two cold-trap water-trapping systems, is a kind of rear-mounted water-trapping system with two water vessels that can catch water simultaneously, can catch water separately and alternately defrost again.This water-trapping system adopted two of being arranged on rear end in the dryness storehouse can catch simultaneously water, again can every water vessel of alternately catching water and defrosting, make steam little from the flow resistance that dryness storehouse flows to water vessel, energy consumption is little; In freeze-drying process early stage, two water vessels are caught water simultaneously, and it is big to catch water area, and the frost layer is thin, helps the seizure of freeze-drying a large amount of steam in early stage, water vessel efficient height; After freeze-drying intermediary and later stages two water vessels carry out alternately defrosting the first time, make that the frost layer of cold group of pipe is very thin, help the effusion of material adsorbed water in the freeze-drying later stage adsorption stripping and dry process, the remaining moisture content of dried frozen aquatic products is lower; Before freeze-drying process finishes, the water vessel that at first carries out defrosting for the first time carries out defrosting for the second time, and (the water vessel frosting layer that carries out defrosting for the first time after this moment is very thin, do not need defrosting for the second time), two water vessels can be directly used in the water of catching of next round freeze-drying process after material delivers from godown, reduced freeze dryer and alternately defrosted dead time of number of times and freeze dryer, efficient height, energy consumption are little.Water vessel and heating plate be not in same storehouse section, and does not interfere mutually in hot and cold temperature field, and energy loss is little, the equilibrium of dry materials speed; Freeze dryer is easy to clean and sterilization, meets hygienic requirements more, has guaranteed that freeze-dried products has lower remaining moisture content.
In sum, production efficiency height of the present utility model, energy consumption is low, and the product health is best in quality.
Description of drawings
Fig. 1 is a schematic top plan view of the present utility model.
Fig. 2 is the A-A cutaway view Amplified image among Fig. 1.
Code name among the figure
1 warehouse, 2 cold pipes or cold drawing group 3 vacuum valves 4 pipelines 5 pipelines
6 discharge outlet, 7 vacuum valves, 8 pipelines, 9 defroster housings
10 interfaces, 11 heat exchangers, 12 fluid level controllers, 13 magnetic drive pumps
14 check valves, 15 connecting legs, 16 pipelines, 17 magnetic valves, 18 evacuation tube
19 vacuum valves, 20 pipelines, 21 dryness storehouses, 22 doors, 23 partition walls
The specific embodiment
Fig. 1 is the schematic diagram of the utility model dryness storehouse water-trapping system, comprises water vessel, a cover negative pressure steam defroster and connecting pipe thereof, valve by the two platform independent operation that is arranged on rear end in the dryness storehouse 21 shown in the figure; Described water vessel comprises warehouse 1, cold pipe group 2 and vacuum valve 3; With two Room about the separating and be divided into partition wall 23 of dryness storehouse 21, as the warehouse 1 of two water vessels away from a section of door 22; Cold pipe group 2 is positioned at warehouse 1, and vacuum valve 3 is positioned at the place that is communicated with of warehouse 1 and dryness storehouse 21, the break-make of control warehouse 1 and dryness storehouse 21.
Cold pipe group 2 employing refrigeration working mediums evaporate the evaporimeter of direct cooling, or the heat exchanger of the indirect cooling of refrigerant all can.
Two cold pipe groups 2 all are connected with refrigeration system by pipeline 4, pipeline 5, and refrigeration working medium enters from pipeline one end, discharges from the other end; Two cold pipe groups 2 can be by refrigeration system cooling individually or simultaneously.
As Fig. 2, two water vessel warehouses, 1 lower bottom part respectively is provided with defrosting discharge outlet 6, two defrosting discharge outlet 6 by interface 10 connections in parallel with negative pressure steam defroster housing 9 of two vacuum valves 7, pipeline 8.
Described negative pressure steam defroster comprises housing 9, heat exchanger 11, fluid level controller 12, pump 13, and described heat exchanger 11 is positioned at housing 9, and the one end is connected with vapour source by pipeline 16, magnetic valve 17; Its other end communicates with drainage network or recovery system.Pump 13 passes to the drainage network through check valve 14.
As Fig. 1, in two water vessels, respectively be provided with an evacuation tube 18 at the end away from dryness storehouse 21 of two warehouses 1, and by two vacuum valves, 19 usefulness pipelines 20 in parallel with the connection of vacuum unit.
This freeze dryer adopts automatic control system, during work, the material (not shown) of intending freeze-drying is housed in dryness storehouse 21, the vacuum valve of opening two water vessels early stage simultaneously 3 at freeze-drying process, vacuum valve 19, open the vacuum unit, refrigeration system is two cold pipes or cold drawing group 2 coolings, make two water vessels catch water simultaneously, a large amount of steam that produce early stage can be caught by catching two enough big cold pipes of water area or plate group 2, and the frost layer can be too not thick, owing to rear-mounted water vessel vapor stream dynamic resistance is less, help forming the sublimate pressure differential of face of material distillation face and water vessel, early stage, rate of drying was fast, and refrigeration compressor Energy Efficiency Ratio height is energy-conservation.In the intermediary and later stages of freeze-drying process, along with minimizing to the material heating intensity, the steam of producing is many unlike early stage, can catch water by a water vessel, close wherein (for example Fig. 1 a left side chamber) water vessel vacuum valve 3 and corresponding vacuum valve 19, and begin this water vessel is carried out the defrosting of negative pressure steam.The process of carrying out the defrosting of negative pressure steam is: after closing vacuum valve 3, vacuum valve 19, open corresponding (chamber, Fig. 2 left side) vacuum valve 7, open 17 pairs of vapours heat exchanger 11 heat supplies of steam electromagnetic valve in vapours source, after being heated, water in the housing 9 under negative pressure, seethes with excitement, produce a large amount of negative pressure steam, enter by pipeline 8 in the water vessel warehouse 1 of left chamber, make the white melting layer on the cold pipe group 2.When frost changes into water in pipeline 8 flows into housings 9, when liquid level surpasses the upper limit liquid level that fluid level controller 12 limits, magnetic drive pump 13 unlatchings are by vacuum check valve 14 outside drainings.When liquid level fell back to the bottom limit level of fluid level controller 12 qualifications, magnetic drive pump 13 quit work.After this water vessel defrosting is finished, close the vacuum valve 7 of left chamber correspondence, and very fast to its cooling cooling, reopen vacuum valve 3, the vacuum valve 19 of left chamber correspondence, make it to catch again water, close vacuum valve 3, the vacuum valve 19 of the water vessel of right ventricle subsequently, open the vacuum valve 7 of right ventricle's correspondence, it is carried out the defrosting of negative pressure steam, after defrosting is finished by identical defrost operation program, it is devoted oneself to work again, catch water.Through two water vessels for the first time alternately after the defrosting, enter the later stage (being the adsorption stripping and dry phase) of freeze-drying process, the steam vapour amount that cause will be caught seldom, it is big that two cold pipe groups 2 of water vessel are caught water area, and the frost layer is very thin, helps the cooling of the face of sublimating, form adsorbed water from the required pressure differential of material effusion, be convenient to the effusion of adsorbed water, freeze-drying process later stage rate of drying is fast, and energy-conservation.Close to an end at freeze-drying process, before dryness storehouse is not removed vacuum, the thicker water vessel that at first carries out defrosting for the first time of frosting layer carried out defrosting second time, at this moment, after to carry out the water vessel frosting layer of defrosting for the first time very thin, do not need to defrost for the second time.After dry materials finishes to deliver from godown, can carry out the next round freeze-drying immediately, two water vessels can directly be used for freeze-drying simultaneously and catch water in earlier stage, have reduced the dead time of freeze dryer.
Compared with prior art, this water-trapping system has following advantage: because this water-trapping system has adopted a dryness storehouse to be furnished with Be arranged on two of rear end in the dryness storehouse can catch simultaneously water, again can every water vessel of alternately catching water and defrosting, water Steam is little from the flow resistance that dryness storehouse flows to water vessel; At freeze-drying process in earlier stage, two water vessels are caught water simultaneously, catch water Area is big, and frost layer is thin, is conducive to the seizure of freeze-drying a large amount of steam in early stage, water vessel efficient height; In the freeze-drying, after Phase two water vessels so that the frost layer of cold group of pipe is very thin, are conducive to freeze-drying later stage solution after carrying out alternately defrosting the first time Blot the effusion of material adsorbed water in the dry process, the remaining moisture content of dried frozen aquatic products is lower; Before freeze-drying process finishes, head The water vessel that carries out earlier for the first time defrosting carries out for the second time defrosting and (carries out for the first time water vessel frosting of defrosting after this moment Layer is very thin, does not need for the second time defrosting), two water vessels can be directly used in the next round freeze-drying process after material delivers from godown Catch water, reduced freeze dryer and alternately defrosted dead time of number of times and freeze dryer; Water vessel and heating plate be not same One storehouse section, cold/hot temperature field are not interfered mutually, and energy loss is little, the equilibrium of dry materials speed; Freeze dryer is easy to Clean and sterilization, more meet hygienic requirements. Therefore, during freeze dryer work, rate of drying is fast, and energy consumption is low, protects Demonstrate,proved freeze-dried products lower remaining moisture content has been arranged. Thereby realized freeze dryer production efficiency height, production cost is low, The purpose of excellent product quality.
Claims (7)
1. the water-trapping system of a vacuum freeze drier comprises two water vessels, a cover negative pressure steam defroster and the connecting pipe thereof, the valve that are arranged in the dryness storehouse, it is characterized in that:
Described water vessel comprises warehouse (1), cold pipe or cold drawing group (2) and vacuum valve (3); With two Room about the separating and be divided into partition wall (23) of described dryness storehouse (21), as the warehouse (1) of described two hydrophones of catching away from a section of door (22); Two described cold pipes or cold drawing group (2) are each positioned in the described warehouse (1), and described vacuum valve (3) is positioned at the place that is communicated with of described warehouse (1) and dryness storehouse (21).
2. according to the water-trapping system of the described vacuum freeze drier of claim 1, it is characterized in that: described cold pipe or cold drawing group (2) are the evaporimeters that refrigeration working medium evaporates direct cooling, or the heat exchanger of the indirect cooling of refrigerant.
3. according to the water-trapping system of the described vacuum freeze drier of claim 1, it is characterized in that: described two cold pipes or cold drawing group (2) all are connected with refrigeration system by pipeline (4), pipeline (5).
4. according to the water-trapping system of the described vacuum freeze drier of claim 1, it is characterized in that: the lower bottom part of the warehouse of described two water vessels (1) respectively is provided with a defrosting discharge outlet (6), and two described defrosting discharge outlet (6) are connected with the interface (10) of described negative pressure steam defroster housing (9) by two vacuum valves (7), pipeline (8).
5. according to the water-trapping system of the described vacuum freeze drier of claim 4, it is characterized in that: described negative pressure steam defroster comprises housing (9), heat exchanger (11), fluid level controller (12), pump (13), described heat exchanger (11) is positioned at housing (9), and the one end is connected with vapour source by pipeline (16), magnetic valve (17); Its other end communicates with drainage network or recovery system.
6. according to the water-trapping system of the described vacuum freeze drier of claim 1, it is characterized in that: on the warehouse (1) of described two water vessels, respectively be provided with an evacuation tube (18), and connect with pipeline (20) and vacuum unit by two vacuum valves (19).
7. according to the water-trapping system of the described vacuum freeze drier of claim 6, it is characterized in that: described evacuation tube (18) is the end away from dryness storehouse (21) that is positioned on the warehouse (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620112961 CN2932261Y (en) | 2006-04-21 | 2006-04-21 | Water catching system of vacuum freeze drying machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620112961 CN2932261Y (en) | 2006-04-21 | 2006-04-21 | Water catching system of vacuum freeze drying machine |
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| Publication Number | Publication Date |
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| CN2932261Y true CN2932261Y (en) | 2007-08-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620112961 Expired - Lifetime CN2932261Y (en) | 2006-04-21 | 2006-04-21 | Water catching system of vacuum freeze drying machine |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102183124A (en) * | 2011-03-13 | 2011-09-14 | 烟台欧立特制药装备有限公司 | Cold trap ice catching system of freeze dryer and ice catching method |
| CN102278871A (en) * | 2010-06-12 | 2011-12-14 | 王一田 | Water catching system of freeze dryer |
| CN104197589A (en) * | 2014-09-02 | 2014-12-10 | 天津商业大学 | Continuous water catching system |
| CN106275492A (en) * | 2015-05-29 | 2017-01-04 | 北京卫星环境工程研究所 | Spacecraft thermal vacuum test distillation water collecting device |
| CN107647246A (en) * | 2017-10-31 | 2018-02-02 | 王田 | Food vacuum is freeze-dried and sterilizing methods and equipment |
| CN110455041A (en) * | 2019-08-28 | 2019-11-15 | 上海盈达空调设备股份有限公司 | Freeze-drying method based on recuperation of heat and photothermal technique |
-
2006
- 2006-04-21 CN CN 200620112961 patent/CN2932261Y/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102278871A (en) * | 2010-06-12 | 2011-12-14 | 王一田 | Water catching system of freeze dryer |
| CN102278871B (en) * | 2010-06-12 | 2015-03-11 | 王一田 | Water catching system of freeze dryer |
| CN102183124A (en) * | 2011-03-13 | 2011-09-14 | 烟台欧立特制药装备有限公司 | Cold trap ice catching system of freeze dryer and ice catching method |
| CN104197589A (en) * | 2014-09-02 | 2014-12-10 | 天津商业大学 | Continuous water catching system |
| CN104197589B (en) * | 2014-09-02 | 2017-01-25 | 天津商业大学 | Continuous water catching system |
| CN106275492A (en) * | 2015-05-29 | 2017-01-04 | 北京卫星环境工程研究所 | Spacecraft thermal vacuum test distillation water collecting device |
| CN106275492B (en) * | 2015-05-29 | 2018-03-27 | 北京卫星环境工程研究所 | Spacecraft thermal vacuum test distillation water collecting device |
| CN107647246A (en) * | 2017-10-31 | 2018-02-02 | 王田 | Food vacuum is freeze-dried and sterilizing methods and equipment |
| CN110455041A (en) * | 2019-08-28 | 2019-11-15 | 上海盈达空调设备股份有限公司 | Freeze-drying method based on recuperation of heat and photothermal technique |
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