JPS6022265B2 - Reduced pressure equilibrium swirl convection heating drying method and its equipment - Google Patents

Description

Detailed Description of the Invention This invention utilizes a depressurizing action that forcibly sucks and exhausts the air in a sealed hollow chamber through the rotation of a rotating body, and a reduction in frictional heat generated by the radial action between the air and the rotating body. The present invention relates to a vacuum-equilibrium swirl heating drying method and apparatus for effectively drying a material to be dried by the convection heating action of swirling laminar flow and the introduction action of outside air.

Conventionally, methods for heating the interior of a hollow chamber have always required a heat source, such as by supplying hot air or using a heater.

In particular, the hollow chamber containing the material to be dried requires an air pump to blow air and a heat source such as oil, gas or a heater to obtain the necessary heated air.

Therefore, heating means for the purpose of drying must require a heat source to obtain heat energy in addition to the energy for blowing air, so that effective energy use is not made, and energy wastage is inevitable. There was an inconvenience.

This invention was made by paying attention to the points mentioned above, and uses the energy for blowing air by the rotation of a rotating body without using a special heat source to obtain heat energy to a sealed hollow chamber. The suction pressure reduction effect based on the pressure reduction is converted into the friction heat generation effect between the rotating body and the air when the pressure reduction is balanced, and the energy is used effectively without waste. This creates a swirling convection effect, and in order to further accelerate drying, the outside air is fed into the hollow chamber in a heated state without overflowing, making it possible to achieve an even more efficient heating drying effect. An object of the present invention is to provide a swirling convection heating drying method and an apparatus therefor.

An embodiment of the invention will be described below with reference to the drawings. 1'
It is a rectangular cylindrical sealed hollow chamber with double door opening structure by pivoting the doors 2, 2, and heat insulation material 3 is interposed on the upper, lower, left and right outer circumferential walls to keep the room warm.

4 is a suction port closed at the center of the ceiling of the hollow chamber 1, and the rotating body a
The shells are arranged so that they can rotate freely.

In the illustration, the rotating body a has a desired oblique angle constituted by rotary blades 6 such as a propeller fan or a shirotskovan, which are rotated by a turtle mechanism 5, and the air inside the hollow chamber 1 is The direction of rotation is determined to suck and exhaust the air. A frictional heat generating portion A is formed in the rotating region of the rotating body a. 7 is a swirling laminar flow forming part;
A circular guide plate 8 extending downward from the suction port 4 of the hollow chamber 1, and a rotatable conical guide plate 8 with a center hole 9 disposed below and slightly apart from the guide plate 8. rotating plate 10
and can generate a swirling laminar flow in the centrifugal direction from the gap g formed between the plates 8 and 10 by using the airflow having the frictional heat obtained in the frictional heat generating section A. It is.

In addition, the upper end of the ball punch 12 is fixed to the center of the rotary plate 10' and the support punch 11 provided to cross the suction port 4, and the lower end thereof hangs downward. The guide plate 8 has swash plates 15 arranged in a certain direction at four points on its circumferential surface. The airflow that is fixed and passes through the gap g is given directivity in the same direction as the rotating direction of the rotating body a, and furthermore, the vanes 16 provided at four locations on the upper surface of the rotating plate 10 receive the directivity of the airflow. The rotating plate 10' generates a rotating action in the same direction as the rotating body a, and this rotating action allows the airflow passing through the gap g to be discharged from the opening end g in the centrifugal direction as a swirling laminar flow. The support section of the electric motor 5 has an exhaust passage 18, and the support tube 17 has a silencer tube 19 at its end.

20 is an outside air supply pipe arranged at the bottom of the hollow chamber 1, and the outer end 2
0a faces the outside from the outer peripheral wall of the hollow chamber 1, and the inner end 20b
is opened upward at the center of the trumpet-shaped expansion plate 21.

Although not shown, an auxiliary heater may be provided inside the expansion plate 21, and this heater may be automatically controlled by a thermostat or the like so as to maintain a set indoor temperature at all times.

Further, the outside air supply pipe 20 has a control valve 2 disposed in the middle thereof.
It can also be used as an automatic control valve that can open and close the valve manually or automatically by detecting the temperature inside the room or the pressure difference between the inside and outside.

-23 is a shelf made of nets, boards, etc. arranged in multiple stages inside the hollow chamber 1, and the interval between the upper and lower shelves and the shape of the shelf can be freely changed depending on the type and size of the material to be dried. This effectively provides a drying effect.

24 is a filter for removing dust, 25 is a viewing window, 26 is various instruments and a control panel, and 27 is a blade provided on the lower surface of the rotary plate 10.

The operation and method of this invention will be explained based on the above configuration.

First, if the electric motor 5 is energized and the rotary blade 6 is rotated,
The air in the sealed hollow chamber 1 is gradually exhausted and depressurized by the suction and exhaust action of the rotary vanes 6, and the pressure difference between the inside and outside of the hollow chamber 1 gradually increases, but when a certain pressure difference is reached, an almost equilibrium state is reached. maintain.

The pressure difference between the inside and outside of the hollow chamber 1 in this approximately constant equilibrium state is determined by the magnitude of the rotational suction force of the rotary blade S and the size of the gap between the suction port 4 and the rotary blade 6. This is maintained as long as the rotational action of the blade 6 continues. In this equilibrium state, a phenomenon of total accumulation of air occurs in the frictional heat generating part A within the rotation area of the rotating blade 6, and the frictional action with the rotating blade 6 continues to be repeated, so frictional heat is generated and its temperature gradually decreases. Rise.

Incidentally, a conical guide plate 8 is fixed to the suction port 4 of the hollow chamber 1, and a conical rotary plate 10 is provided in parallel with the guide plate 8 to form a gap g. Therefore, the airflow having frictional heat flows downward through this gap g in a laminar flow state, and at the same time, in order to rotate the rotating plate 10, it becomes a swirling flow and flows through the hollow space under centrifugal action. A rapid airflow is generated along the outer peripheral wall of the chamber 1.

Furthermore, since the rotary plate 10 has a center hole 9 at its center, the airflow in the center of the hollow chamber 1 rises and is sucked.
In this manner, in a state where the air pressure in the hollow chamber 1 is subjected to the depressurizing effect due to the rotation of the rotary vanes 6, the action of the swirling laminar flow forming section 7 causes a convection effect of the airflow moving from the outer periphery toward the center side. , the temperature inside the chamber 1 can be uniformized rapidly to a desired set temperature.

Moreover, the convecting and overflowing airflow uniformly enters and acts on the shelves 23 arranged in multiple stages, thereby heating the whole under reduced pressure. After reaching the desired temperature, operate the control valve 22 from the outside air supply pipe 20 to introduce outside air into the hollow chamber 1.
will be sent within.

Therefore, the moisture content of the dried material on the shelf 23 in the hollow chamber 1 is increased due to the depressurization effect and the swirling convection action, and the moisture content of the dried material is increased due to the heating effect on the dried material due to the rise in room temperature. By promoting the release of free moisture from the object and by effectively exhausting the vaporized evaporation content by introducing heated outside air, the object to be dried in the entire area of the hollow chamber 1 can be dried with high efficiency in a short period of time. .

In particular, the airflow acts on the shelves 23 throughout the hollow chamber 1 due to the swirling convection action, and the temperature distribution becomes uniform, and by introducing outside air intermittently, the drying effect is further promoted and the external shape is not damaged. You can dry items such as shiitake mushrooms beautifully without drying.

Although the embodiments of the present invention have been described above, the swirling laminar flow forming section 7 is not limited to the above-mentioned configuration, and the lower conical rotary plate 10 is fixed, and the upper conical The guide plate 8 may be rotated, or the upper and lower plates 8 and 10 may be fixed, and another rotatable member may be interposed in the gap g to obtain swirling laminar flow. Good too.

It is known that the force of this swirling laminar flow is stronger as the degree of vacuum in the hollow chamber 1 increases, and gradually weakens as the degree of vacuum decreases. Further, although the hollow chamber 1 is shown to have a cubic shape, this shape is not particularly limited, and it goes without saying that it may have a cylindrical structure.

In the case of a cubic shape as shown in the figure, curved surfaces may be formed at the four corners of the four circumferences to gradually reduce the flow resistance of the swirling laminar flow. As described above, this invention suctions and exhausts the air in a sealed hollow chamber by the rotational action of a rotating body, maintains the hollow chamber in a reduced pressure state, and maintains the pressure difference between the inside and outside in a substantially constant equilibrium state. The rotating action of the rotating body is continued to generate frictional heat due to the frictional action between the rotating body and the air, and the gas having this frictional heat is caused to naturally generate an effective convection action by the swirling laminar flow forming section. After the temperature of the frictional heat reaches the desired temperature, heated or unheated outside air is sent from the outside air supply pipe to effectively dry the material to be dried, which greatly improves the drying effect.
Moreover, high quality dried products can be obtained.

Therefore, the use of direct heat sources such as heaters and fuel as in the past is omitted, and effective drying is performed by the rotational friction effect of the rotating body, the depressurizing effect, and the convection effect due to the swirling laminar flow. It has characteristics that allow it to be effectively used in drying operations.

[Brief explanation of the drawing]

The figure shows an embodiment of the depressurized balanced swirl convection heating drying device according to the present invention, and FIG. 1 is a partially cutaway front view of the whole;
FIG. 2 is an enlarged side view of the swirling laminar flow forming section same as above, FIG. 3 is an enlarged bottom view of same as above, and FIG. 4 is a partially cutaway side view of FIG. DESCRIPTION OF SYMBOLS 1... Sealed hollow chamber, 4... Suction port, 7... Swirling laminar flow forming section, 17... Outside air supply section, 20... ...Outside air supply pipe, 23...
- Appropriately shaped shelf, a... Indicates a rotating body, consisting of an electric motor 5 and a rotating blade 6. A...Frictional heat generating part. Figure 2 Figure A Figure J Figure 3

Claims (1)

[Scope of Claims] 1. The air in the sealed hollow chamber is forcibly sucked by the rotating action of a rotating body and exhausted to the outside, thereby reducing the pressure in the room and keeping the pressure difference between the inside and outside in a substantially constant equilibrium state. , while maintaining this equilibrium state, the rotating action of the rotating body is continued to promote frictional action with the air to generate frictional heat, and the airflow having this frictional heat is swirled around the rotating body. It is maintained in a state of flow and forced to descend along the inner circumferential wall of the hollow chamber, thereby allowing a convection effect to occur in the hollow chamber, and furthermore, the outside air, which is preheated or not preheated, is fed into the hollow chamber by manual or automatic operation. A vacuum-equilibrium swirl convection heating drying method that dries the material to be dried in a hollow chamber. 2 A suction port that communicates with outside air is provided at a desired location in a sealed hollow chamber that stores the material to be dried, a rotating body that performs forced exhaust is disposed in this suction port, and frictional heat is generated in the rotation area of this rotating body. A reduced pressure balanced swirl convection heating comprising: a swirling laminar flow forming section that forms a generation section and has a narrow gap centered on the rotating body, and an outside air supply section having a regulating valve provided in the hollow chamber; Drying method.