CN102538423A

CN102538423A - Microwave vacuum drier

Info

Publication number: CN102538423A
Application number: CN2012100292068A
Authority: CN
Inventors: 周跃云; 蔡博
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-02-10
Filing date: 2012-02-10
Publication date: 2012-07-04

Abstract

The invention discloses a microwave vacuum drier, which comprises a feeding vacuum chamber, a microwave vacuum chamber and a cooling discharging vacuum chamber, which are sequentially connected through vacuum valves. A stepping conveyor is arranged in each vacuum chamber, the vacuum valves are arranged at the front end of the feeding vacuum chamber and the rear end of the cooling discharging vacuum chamber respectively, and a microwave heating device is arranged on the side wall of the microwave vacuum chamber. The microwave vacuum drier is easier to be synchronously matched with a production line by feeding in a stepping way, microwave vacuum drying and a continuous drying way of cooling and discharging. Compared with a single-chamber microwave vacuum dryer, the microwave vacuum drier has the advantages that time for inflating the vacuum chambers after drying is complete, taking and placing feed plates and re-vacuuming after the feed plates are mounted is saved, so that working efficiency is improved; and the microwave vacuum drier is applicable to dewatering and drying for agricultural products, health care products, food, medicinal materials, fruits, vegetables, chemical raw materials and the like with high added-value and heat sensitivity, and used for low-temperature concentration of chemical products, removal of water of crystallization, dewatering and drying of traditional Chinese medicine extracts and enzyme preparations, and the like.

Description

A kind of microwave vacuum dryer

Technical field

The invention belongs to the dry materials equipment technical field, relate in particular to a kind of microwave vacuum dryer.

Background technology

Heating using microwave is a kind of radiation heating, and the frequency of general heating using microwave is 2450GHz, makes the hydrone that is heated material produce vibration; Friction generates heat mutually between the molecule, is heated simultaneously inside and outside making it, need not through convection current or transmit heat; So firing rate is fast, the thermal efficiency is high, the processing time is short, the material inside and outside temperature is even, so energy savings; Drying efficiency is high, and dry mass is good.Because the boiling point and the atmosphere of water are pressed with direct relation, atmospheric pressure is low more, and the boiling point of water is low more; As under an atmospheric pressure (101.3KPa); The boiling point of water is 100 degrees centigrade, and under-0.073 MPa, the boiling point of water is 45 degrees centigrade; Under-0.08 MPa, the boiling point of water is 35 degrees centigrade.Therefore, under vacuum condition, the material internal moisture is evaporated under low-temperature condition, reaches the purpose of low temperature drying.Under the general working condition; The efficient of microwave drying is 1Kg water/KW; So the micro-wave vacuum mode has obtained widely using, the vacuum type microwave dryer is mainly used in high added value and has dehydrating of the agricultural byproducts of thermal sensitivity, health products, food, medicinal material, fruits and vegetables, industrial chemicals etc., and the low temperature that is used for chemical products concentrates, the drying of the removing of the crystallization water, enzyme preparation etc.; The vacuum extraction of Chinese herbal medicine is applicable to the laboratory of research institutions etc.

Present microwave dryer generally has two kinds of forms: a kind ofly by ribbon conveyer and sealing body the microwave dryer of conveying continuously in upright arrangement that microwave generating apparatus forms is housed; The material that is dried joins the conveyer feed end, carries continuously through the microwave drying section with the conveyer transmission and realizes dehydrating, and transfers out dry material from discharge end then; The microwave dryer that belongs to continuous feeding and discharging; The microwave dryer of conveying continuously in upright arrangement is in condition of normal pressure, and the gasification temperature point of water is 100 ℃, and the dry materials temperature is high; Do not reach the low temperature drying condition, and efficient is low.Another kind is the microwave vacuum dryer that microwave generating apparatus is equipped with on single vacuum chamber and vacuum chamber top; Its vacuum chamber middle part is according to being equipped with the pivoted frame that can carry the material charging tray that is dried on the rotary axle, and charging tray is lifted on respectively and keeps relative level to do gyration on the pivoted frame, makes material evenly accept microwave drying; This kind equipment belongs to the noncontinuity production equipment; Cyclic processes such as work period will accomplish charging, vacuumizes, microwave drying, vacuum chamber air inlet, discharging, the single chamber microwave vacuum dryer is owing to adopt single cell structure, and a dry run is to open door for vacuum chamber; Containing upward with charging tray, material hangs on the pivoted frame one by one; Shut door for vacuum chamber then, the dry back of finishing is opened door for vacuum chamber again after to the vacuum chamber inflation and is taken out material one by one, so can not continuous feeding and discharging work; Inconvenience and production line are supporting synchronously, and labour intensity is also big.The microwave vacuum dryer that also has the bigger horizontal single vacuum chamber form of a kind of draw ratio; Adopt multilayer group travelling belt to rotate and carry dried material; CN201010141441.5 discloses a kind of continuous microwave vacuum drying, sterilizing processing device like the Chinese invention patent application; The horizontal multi-layer microwave vacuum dryer is unfavorable for making each layer dried material to accept uniform heating using microwave, and complex structure.

Summary of the invention

The purpose of this invention is to provide a kind of in-line arrangement stepping and carry microwave vacuum dryer, realize material continuous drying under vacuum state.

For achieving the above object, the technical scheme that the present invention adopts is:

A kind of microwave vacuum dryer; Comprise the charging vacuum chamber, microwave vacuum chamber and the cooling discharge vacuum chamber that connect through vacuum valve successively; Be provided with the stepping conveyer in each vacuum chamber; Be provided with vacuum valve at charging vacuum chamber front end and cooling discharge vacuum chamber rear end, the sidewall in the microwave vacuum chamber is provided with microwave heating equipment.

Material loading and discharging for ease is provided with material conveyer in the front of said charging vacuum chamber front end vacuum valve, and the back of vacuum valve is provided with discharge conveyor in said cooling discharge vacuum chamber rear end.

Independent for ease control, said charging vacuum chamber, microwave vacuum chamber and cooling discharge vacuum chamber are equipped with independently vacuum generating device.

For material is preheated, also be provided with microwave heating equipment at the sidewall of said charging vacuum chamber.

Advantage of the present invention is the continuous drying mode that has realized by step-by-step system charging, micro-wave vacuum, cooling discharge, more is prone to production line supporting synchronously; Compare with the microwave vacuum dryer of single chamber, saved dry completion final vacuum chamber inflation, vacuumized equal time again after picking and placeing charging tray, charged dish, improved work efficiency; Because the cross section of each vacuum chamber so magazine and vacuum chamber volume ratio can be accomplished minimum, can be practiced thrift the vacuum unit capacity as long as satisfy through material and charging tray and realization stepping transmission; The low temperature that dehydrates, is used for chemical products that the present invention is applicable to high added value and has the agricultural byproducts of thermal sensitivity, health products, food, medicinal material, fruits and vegetables, an industrial chemicals etc. concentrates, the dehydrating etc. of the removing of the crystallization water, Chinese medical concrete and enzyme preparation.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is an A-A cutaway view among Fig. 1.

The specific embodiment

Like Fig. 1, shown in Figure 2; A kind of microwave vacuum dryer; Comprise the charging vacuum chamber 4, microwave vacuum chamber 5 and the cooling discharge vacuum chamber 8 that connect through vacuum valve 3 successively; The cross section of each vacuum chamber and length dimension confirm that by the drying capacity of design each vacuum chamber bottom is provided with stepping conveyer 7, is provided with vacuum valve 3 at the front end of charging vacuum chamber 4 and the rear end of cooling discharge vacuum chamber 8; Upper wall in microwave vacuum chamber 5 is provided with microwave heating equipment 6; (setting of microwave heating equipment 6 belongs to prior art; Around microwave vacuum chamber 5, all can install) be in continuous duty in dry run; Upper wall at charging vacuum chamber 4 also is provided with microwave heating equipment 6, and the microwave heating equipment 6 of charging vacuum chamber 4 upper walls can preheat material, when material needs the microwave drying time longer; The microwave heating equipment 6 of after reaching vacuum after the charging, opening charging vacuum chamber 4 upper walls preheats drying; On the one hand can shorten the dry materials time, also can make the power of the microwave heating equipment 6 that reduces microwave vacuum chamber 5 upper walls can satisfy the demand of dry materials on the other hand, microwave heating equipment 6 is by total microwave power and the different dry sections requirement layout to microwave power intensity; Front at charging vacuum chamber 4 front end vacuum valves 3 is provided with material conveyer 1, is provided with discharge conveyor 9 in the back of cooling discharge vacuum chamber 8 rear end vacuum valves 3, and the magazine 2 of being convenient to carry material can be set on conveyer; Charging vacuum chamber 4, microwave vacuum chamber 5 and cooling discharge vacuum chamber 8 are equipped with the vacuum generating device of independently being made up of vacuum unit 10 and condenser system 11; Can make the working vacuum degree reach 50～1000Pa; When vacuum valve 3 contract fullys, charging vacuum chamber 4 and the vacuum～normal pressure transition chamber of cooling discharge vacuum chamber 8 as charging and discharging can independently vacuumize or inflate; Microwave vacuum chamber 5 then can keep vaccum working condition always, carries out micro-wave vacuum.

The course of work of the present invention is described below:

1. place magazine 2 on the material conveyer 1 and add material to be dried;

2. vacuum valve 3 Close All states, charging vacuum chamber 4 and the vacuum～normal pressure transition chamber of cooling discharge vacuum chamber 8 as charging and discharging charge into atmosphere to normal pressure;

3. open charging vacuum chamber 4,8 liang of outsides of cooling discharge vacuum chamber vacuum valve 3; The stepping conveyer 7 of charging vacuum chamber 4, cooling discharge vacuum chamber 8 starts; Last material conveyer 1 also starts with discharge conveyor 9 synchronously; The magazine 2 that has filled material on the last material conveyer 1 is sent into charging vacuum chamber 4, and the dry magazine 2 of cooling discharge vacuum chamber 8 passes out on the discharge conveyor 9;

4. close the vacuum valve 3 in charging vacuum chamber 4,8 liang of outsides of cooling discharge vacuum chamber, charging vacuum chamber 4 and cooling discharge vacuum chamber 8 are vacuumized, make itself and microwave vacuum chamber 5 reach essentially identical vacuum;

5. open the vacuum valve 3 of 5 both sides, microwave vacuum chamber; Control starts the stepping conveyer 7 of charging vacuum chamber 4, microwave vacuum chamber 5, cooling discharge vacuum chamber 8; The magazine 2 of the material of packing into of charging vacuum chamber 4 is sent into microwave vacuum chamber 5; Magazine 2 dry in the microwave vacuum chamber 5 is sent into cooling discharge vacuum chamber 8 simultaneously; Close the vacuum valve 3 of 5 both sides, microwave vacuum chamber then; Then all materials in the microwave vacuum chamber 5 continue dryly, and simultaneously charging vacuum chamber 4, cooling discharge vacuum chamber 8 are vacuumized (if the microwave drying time is longer, the 6 pairs of materials of microwave heating equipment that can open charging vacuum chamber 4 upper walls after charging vacuum chamber 4 vacuumized preheat); Press said process successively repeatedly and realize the continuous drying process of step feeding, micro-wave vacuum and discharging.

Claims

1. microwave vacuum dryer; It is characterized in that; Comprise the charging vacuum chamber, microwave vacuum chamber and the cooling discharge vacuum chamber that connect through vacuum valve successively; Be provided with the stepping conveyer in each vacuum chamber, be provided with vacuum valve at charging vacuum chamber front end and cooling discharge vacuum chamber rear end, the sidewall in the microwave vacuum chamber is provided with microwave heating equipment.

2. microwave vacuum dryer as claimed in claim 1 is characterized in that, is provided with material conveyer in the front of said charging vacuum chamber front end vacuum valve, and the back of vacuum valve is provided with discharge conveyor in said cooling discharge vacuum chamber rear end.

3. according to claim 1 or claim 2 microwave vacuum dryer is characterized in that said charging vacuum chamber, microwave vacuum chamber and cooling discharge vacuum chamber are equipped with independently vacuum generating device.

4. microwave vacuum dryer as claimed in claim 3 is characterized in that, also is provided with microwave heating equipment at the sidewall of said charging vacuum chamber.