JP2008175516A - Highly functional decompression drying machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly functional decompression drying machine providing sensuous detailed drying functions such as drying of vegetables or fruits, and using a new heating means for objects to be dried not limited to conductive heat transfer, convection heat transfer, or radiation heat transfer, with both means for normal pressure and decompression in a drying machine internal pressure, and with a plurality of means for stationary, circulating, and exhaust in an air flow in the drying machine, as the detailed drying functions. <P>SOLUTION: The decompression drying machine is composed of a casing capable of enduring decompression, the heating means for heating the objects to be dried such as fruits or fish, and a pressure control means for controlling a pressure in the casing. It is characterized by that a power heat pipe is used for generating an ultrasonic wave of 32.5 kHz when hot water of about 50°C is passed through a heat transfer pipe of the heating means, and normal pressure hot air circulation drying can be carried out also. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention belongs to the field of agriculture and food processing for drying vegetables and fruits.
Dried vegetables can be eaten at any time by pouring hot water, and the dried vegetables can be mixed with various foodstuffs by processing them into powder. Also, dried fruits have long been popular as dried fruits, and you can enjoy a different texture than fresh fruits.

Japanese Patent Application No. 2003-281724 Japanese Patent Application No. 2003-019441 Japanese Patent Application No. 2002-240897 Japanese Patent Application No. 2002-145451 Japanese Patent Application No. 2002-063269 Japanese Patent Application No. 11-339419 Japanese Patent Application No. 11-128124 Japanese Patent Application No. 7-11155 Japanese Patent Application No. 5-331911 Japanese Patent Application No. 5-299343

(Patent Document 1) Japanese Patent Application No. 2003-281724 is a proposal of a method of drying a laundry in a laundry dryer at a low temperature in a short time, and is not a proposal of food drying such as vegetables and fruits. Also, (Patent Document 2) Patent Application 2003-041941 is a method for drying a powder cake in a water-containing state, and changes the heating by the double wall structure of the container and the jacket and the swing width and swing speed of the drying tank. Although it is characterized by this, it does not leave the area of mere vacuum drying.

(Patent Document 3) Japanese Patent Application No. 2002-240897 does not leave the area of a mere vacuum dryer as in the above-mentioned proposal. (Patent Document 4) Japanese Patent Application No. 2002-145451 is also a proposal of a method for drying a slurry under reduced pressure, and is not a proposal for drying food such as vegetables and fruits.

(Patent Document 5) Japanese Patent Application No. 2002-063269 is a vacuum dryer that uses dielectric heating by microwaves as a heating means. However, dielectric heating by microwaves is difficult to increase in size, such as vegetables and fruits. There are difficulties in places that are not suitable for mass drying. In addition, (Patent Document 6) Japanese Patent Application No. 11-339419 proposes drying under reduced pressure by stirring in order to exhibit a high drying capacity without vacuum-depositing an object to be dried. When used for drying, the material to be dried is damaged and the commercial value is lost.

(Patent Document 7) Japanese Patent Application No. 11-128124 proposes drying by circulation floating in order to efficiently dry dried objects such as tea leaves, rape leaves, granular cereals, sliced vegetables and fruits in a short time. However, there is a problem that it cannot be applied to vegetables and fruits that cannot circulate and float. Further, (Patent Document 8) Japanese Patent Application No. 7-111155 does not deviate from the area of a general vacuum dryer provided with a vacuum drying chamber, a vacuum pump, and a heating means for an object to be dried.

(Patent Document 9) Japanese Patent Application No. 5-331911 is not related to a means for drying vegetables and fruits for the purpose of providing a vacuum heating dryer having a thin storage container. In addition, (Patent Document 10) Japanese Patent Application No. Hei 5-299343 relates to the improvement of energy utilization efficiency of a vacuum dryer, and does not relate to vegetable and fruit drying means like the former.

Conventional dryers are roughly divided into atmospheric dryers, hot air or hot air circulation dryers, fluid dryers, reduced pressure or vacuum dryers, etc., which are satisfactory in terms of functionality, although each has its own ingenuity. It is not a thing.
The problem to be solved by the present invention is to provide a fine drying function that appeals to the human senses like the drying of vegetables and fruits by combining the functions of conventional dryers. The fine drying function is not limited to conduction heat transfer, convection heat transfer or radiant heat transfer as a means for heating an object to be dried. It is an object to provide a high-performance dryer having a plurality of means for static air, circulation, and exhaust airflow in the machine.

The problem solving means of the present invention will be described.
In the invention of claim 1,
A housing (2) that can withstand decompression, a heating means (7) for heating an object to be dried such as vegetables, fruits and fish in the housing (2), and a pressure in the housing (2) When the hot water of about 50 ° C. is passed through the heat transfer tubes (8a) and (8b) of the heating means (7) in the vacuum dryer (1) constituted by the pressure control means (4) for controlling the temperature of 32.5 kHz It is a high-functional vacuum dryer using a power heat pipe that generates ultrasonic waves.

In the invention of claim 2,
An air circulation means (10) for circulating the air in the housing (2) is provided, and the object to be dried is dried by a combined drying profile of atmospheric hot air circulation drying and reduced pressure drying. The high-performance vacuum dryer according to claim 1.

Conventional dryers have been used with a single function, such as a hot air circulation dryer, a vacuum or vacuum dryer, or a radiation heating dryer, but the dryer of the present invention is a hot air circulation dryer and This is a multi-function dryer that combines the functions of a vacuum dryer, and it has become possible to meet the diverse demands of users by making full use of a composite drying profile that is not available in previous dryers.

The best mode for carrying out the invention will be described.
[FIG. 1] is an elevation view of a main body showing a specific embodiment of the present invention, [FIG. 2] is an AA sectional view showing a specific embodiment of the present invention, and [FIG. 3] is a specific embodiment of the present invention. BB sectional drawing which shows is shown, respectively.

Specific embodiments of the embodiment of the present invention will be described based on [FIG. 1] and [FIG. 2].
In an embodiment of the present invention, a housing (2) that can withstand decompression, a heating means (7) for heating an object to be dried such as vegetables, fruits and fish in the housing (2), and the housing In the vacuum dryer (1) configured by the pressure control means (4) for controlling the pressure in the body (2), hot water of about 50 ° C. is added to the heat transfer tubes (8a) and (8b) of the heating means (7). A power heat pipe that generates ultrasonic waves of 32.5 kHz when water is passed is used.

The casing (2) has a sealed structure with end plates (3a) and (3b), and a pressure control means (4) is connected to the casing (2) by a decompression pipe (5), and the casing (2) The air inside is discharged from the decompression pipe (5) through the pressure control means (4) to the atmosphere from the exhaust pipe (6).
Further, heat transfer tube supports (2a) and (2b) are respectively fastened to the inner wall of the casing (2). Heat transfer tubes (8a) and (8b) are respectively fastened to the heat transfer tube supports (2a) and (2b), and the heat transfer tubes (8a) and (8b) are heated by the hot water pipes (9a) and (9b). And pipe connected.

The heat transfer tube supports (2a) (2b) tightly connected to the inner wall of the housing (2) also serve as a guide for the shelf (11) for the object to be dried, and between the heat transfer tube supports (2a) (2b) A to-be-dried product shelf (11) loaded with vegetables, fruits, fish and the like is inserted, and the to-be-dried product shelf (11) is fixed at a position facing the heat transfer tubes (8a) and (8b). .

Next, the usage method will be described.
After inserting the shelf (11) to be dried loaded with vegetables, fruits and fish between the heat transfer tube supports (2a) and (2b), the end plates (3a) and (3b) of the housing (2) are closed and heated. The means (7) is activated to heat the heat transfer tubes (8a) and (8b), and the dry matter (not shown) loaded on the shelf for dry matter (11) by convection heat transfer and radiation heat transfer. At the same time, the pressure control means (4) is activated to depressurize the housing (2).

In this example, the housing dimensions are 1,400 mm inside diameter, 2,400 mm in length, the pressure in the housing is 650 hPa, the heating means is an oil-fired boiler OH-G640YBL, and the heat transfer tube is Sanwa Steel A company-made power heat pipe (caliber: 48.6 mm, length: 1600 mm) was employed.

Specific embodiments of other embodiments of the present invention will be described with reference to FIG.
In another embodiment, an air circulation means (10) for circulating air in the housing (2) is provided, and the object to be dried is dried by a combined drying profile of normal pressure hot air circulation drying and reduced pressure drying. I was able to do it.

Depending on the dry matter, drying under reduced pressure from the beginning reduces the air density because the pressure inside the housing is low.Therefore, convective heat transfer may not be sufficient and the drying speed may not increase. After drying the dried product in advance with hot air circulation, drying under reduced pressure leads to improvement in productivity, so that drying can be performed in the order of atmospheric hot air circulation drying and reduced pressure drying. In addition, Hitachi Ltd. pressure ventilation fan PN-404-04H was used for the air circulation means.

The high-performance vacuum dryer according to the present invention is an unprecedented combined dryer, and has two functions of atmospheric hot air circulation drying and vacuum drying. It can be expected to be used widely. In recent years, children's unbalanced diet in instant foods has become a social problem, but it can be added to any food by drying and crushing vegetables, fruits and fish with the high-performance vacuum dryer of the present invention. Therefore, it is expected to contribute greatly to a balanced intake of the five major nutrients.

These are the body elevation views which show the specific aspect of this invention. These are AA sectional drawing which shows the specific aspect of this invention. These are BB sectional drawings which show the specific aspect of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vacuum dryer 2 Case 2a Heat transfer tube support 2b Heat transfer tube support 3a End plate 3b End plate 4 Pressure control means 5 Pressure reduction pipe 6 Exhaust pipe 7 Heating means 8a Heat transfer pipe 8b Heat transfer pipe 9a Hot water pipe 9b Hot water pipe 10 Air circulation means 11 Shelf for dried items

Claims (2)

A housing (2) that can withstand decompression, a heating means (7) for heating an object to be dried such as vegetables, fruits and fish in the housing (2), and a pressure in the housing (2) When the hot water of about 50 ° C. is passed through the heat transfer tubes (8a) and (8b) of the heating means (7) in the vacuum dryer (1) constituted by the pressure control means (4) for controlling the temperature of 32.5 kHz A high-performance vacuum dryer using a power heat pipe that generates ultrasonic waves. An air circulation means (10) for circulating the air in the housing (2) is provided, and the object to be dried is dried by a combined drying profile of atmospheric hot air circulation drying and reduced pressure drying. The highly functional vacuum dryer according to claim 1.

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