Freeze dryer
Technical field
The present invention relates to a kind of freeze dryer.
Background technology
Containing the large quantity of moisture material, lowering the temperature in advance is frozen into solid, makes moisture content by the solid-state gaseous state that is directly sublimed into then under the condition of vacuum, separates from material exactly in freeze drying.Under this working condition, easily oxidation, material volatile, thermal sensitivity can both be preserved, and can suppress the illeffects of bacterium and enzyme, well the biology of retained product, chemical constitution and activity thereof.Thereby the color of freeze-dried material, shape and nutrition can both keep the same substantially with bright product, and rehydration is easy, quick, can be recovered to the aquatic foods product substantially, and the freeze-dried material water content helps the long preservation of material below 3%.
Existing freeze dryer is divided into split type freeze dryer and integral type freeze dryer, and split type freeze dryer is precooling, drying in producing and catch three operations of water separately, is gone to finish by three independent device respectively, this freeze dryer volume is big, complex structure, complex operation, and energy consumption is bigger; Freezing, the drying and the cold-trap of integral type freeze dryer place in the same casing, as China Patent No. is the freeze dryer that ZL94205313.3, name are called disclosed a kind of integral type in the description of the invention of " a kind of vacuum freeze drier ", have cold drawing group frame and hot plate group frame in the casing, material place earlier carry out on the cold drawing group frame freezing, after freezing the finishing, again material is moved on the hot plate group frame and heat, vacuumize in the casing, make the water sublimed in the material, cold drawing group frame continues refrigeration simultaneously, play the effect of cold-trap, catch the steam of distillation.The shortcoming of this freeze dryer is: 1, the heat radiation of hot plate group frame influences cold drawing group frame, and energy consumption is bigger.2, frozen materials must be moved to hot plate group frame, complex operation by cold drawing group frame.3, cold drawing group frame gap is big, and when doing the cold-trap use, it is less that steam and cold drawing group bridge joint touch area, can not fully catch steam.
Summary of the invention
Purpose of the present invention just provide a kind of energy consumption less, easy to operate, catch the sufficient freeze dryer of water.
The present invention includes casing, freezing unit, vavuum pump and heating plate, freezing unit has compressor, heat exchanger, expansion valve and evaporimeter; Heating plate is arranged on the casing front portion, and the evaporimeter of freezing unit is arranged on the casing rear portion; Have the blinds dividing plate between heating plate and the evaporimeter, the evaporimeter rear has blower fan.
In the casing of above-mentioned freeze dryer, the evaporimeter top has shower, bottom half tool outlet pipe, connect casing outside, between shower and the outlet pipe defrost pump and boiler; The heat exchanger of freezing unit places boiler.
The evaporimeter of above-mentioned freeze dryer is for being bent to the three-dimensional coiled pipe that straight tube, bend pipe are provided with at interval by a long tube, straight tube dislocation between adjacent lines is arranged, making steam flow is bending channel through the steam flow passage of evaporimeter, the steam flow direction is perpendicular to the evaporimeter straight tube, is in spacing between the anterior evaporimeter straight tube greater than the spacing between the evaporimeter straight tube that is in the rear portion.
Spacing between the evaporimeter straight tube that is in the front portion of above-mentioned freeze dryer is at least greater than 3 centimetres of the spacings between the evaporimeter straight tube that is in the rear portion.
Spacing between the evaporimeter straight tube that is in the front portion of above-mentioned freeze dryer is 1.5 times of straight tube caliber at least.
The heating plate of above-mentioned freeze dryer adopts fine copper to manufacture, and surface blackening is handled, and inside is left and added zone of heat liberation.
Technique scheme of the present invention has the following advantages compared to existing technology:
(1) energy consumption is low: because 1, have the blinds dividing plate between heated barrier of the present invention and the evaporimeter, do not influence the steam circulation, simultaneously effective blocking radiant heat; The heat energy heating that produces when 2, the present invention utilizes freezing unit to freeze; 3, adjacent two-layer straight tube dislocation is arranged before and after the condenser pipe of evaporimeter, but has strengthened the area that touches of condensing body and condenser pipe, but condensing body and huyashi-chuuka (cold chinese-style noodles) collision frequency are many, can fully reclaim gas, and playing the effect of cryosorption pump, its pressure decay rate is fast, vacuum effectiveness good.So the present invention has advantage of low energy consumption.
(2) easy to operate: because the present invention need not repeatedly mobile material, so easy to operate.
Description of drawings
For the easier quilt of content of the present invention is clearly understood, below according to a particular embodiment of the invention and in conjunction with the accompanying drawings, the present invention is further detailed explanation, wherein
Fig. 1 is a structural representation of the present invention.
Fig. 2 is the structural representation of evaporimeter among the present invention.
Fig. 3 arranges schematic diagram for the evaporimeter straight tube.
The specific embodiment
See Fig. 1, the present invention relates to a kind of freeze dryer, comprise casing 1, freezing unit 2, vavuum pump 3 and heating plate 4, freezing unit 2 has compressor 21, heat exchanger 22, expansion valve 23 and evaporimeter 24; Heating plate 4 is arranged on casing 1 front portion, and the evaporimeter 24 of freezing unit 2 is arranged on casing 1 rear portion; Casing 1 outside is provided with electrical heating fuel tank 91 and the hot oil pump 92 that heat energy is provided for heating plate 4, described heating plate (4) employing heat transfer and radiance fine copper are preferably manufactured, surface blackening is handled, inside is left and is added zone of heat liberation, the inlet of passage is connected with hot oil pump 92, the outlet of passage is connected with electrical heating fuel tank 91, and hot oil pump 92 is transported to conduction oil in the coil pipe of heating plate 4 and carries out thermal cycle.Have blinds dividing plate 6 between heating plate 4 and the evaporimeter 24, evaporimeter 24 rears have blower fan 5.In the casing 1, evaporimeter 24 tops have the shower 71 that defrost is used, casing 1 bottom has outlet pipe 72, connect casing 1 outside, between shower 71 and the outlet pipe 72 defrost pump 73 and boiler 74; The heat exchanger 22 of freezing unit 2 places boiler 74, and the heat that produces when utilizing freezing unit 2 to freeze provides heat energy for boiler 74.
See Fig. 2, Fig. 3, evaporimeter 24 is for to bend to the three-dimensional coiled pipe that straight tube 24-1, bend pipe 24-2 are provided with at interval by a long tube, straight tube 24-1 dislocation between adjacent lines is arranged, making the steam flow passage in the casing 1 is bending channel, the steam flow direction is perpendicular to heat exchanger straight tube 24-1, is in spacing between the anterior heat exchanger straight tube 24-1 greater than the spacing between the heat exchanger straight tube 24-1 that is in the rear portion; Be in spacing between the anterior heat exchanger straight tube 24-1 at least greater than 3 centimetres of the spacings between the heat exchanger straight tube 24-1 that is in the rear portion among the present invention, be in spacing between the anterior heat exchanger straight tube 24-1 and be at least 1.5 times of straight tube caliber.
The present invention puts into material disc with material earlier in use, material disc is placed on the heating plate 4 shutoff operation door 13 again.Open freezing unit 2 and freeze, and by blower fan 5 cold air of freezing unit evaporimeter 24 is delivered to casing 1 front portion, material is carried out precooling, this moment, evaporimeter 24 played refrigeration.After the material precooling is finished, close blower fan 5, start vavuum pump 3, the evaporimeter 24 of freezing unit 2 continues refrigeration, and evaporimeter 24 plays cold-trap and carries out work at this moment.After the pneumatics power of taking seriously was lower than 610Pa, ice directly became gas by solid and carries out lyophilization.Vacuum pressure reduced constantly, expect that temperature also takes away heat because of distillation and reduce along with the carrying out that vacuumizes this moment, and during the pneumatics power of taking seriously≤130Pa, startup hot oil pump 92 is heating plate 4 additional heat.Appropriate control vacuum pressure and temperature of charge make ice carry out lyophilization under nonfused condition, and ice as thawing then can cause subsides, and causes the freeze drying failure.After the material freeze drying is finished, shut down, take out material.Restart 73 defrosts of defrost pump, the frostization on evaporimeter 24 back is to the greatest extent shut down, and waits for and working next time.