JPS5821185B2 - Decompression equilibrium swirl convection heating method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention reduces the temperature in a sealed hollow chamber by promoting friction with the air while keeping the chamber in a reduced pressure state through the rotational action of a rotating body, thereby generating frictional heat. The present invention relates to a reduced-pressure equilibrium swirling convection heating method that converts an airflow having a swirling laminar flow into a swirling laminar flow state to generate convection within a hollow chamber, thereby maintaining a uniform temperature distribution within the hollow chamber.

In addition, this invention makes it possible to effectively dry the material to be dried in a sealed hollow chamber through the synergistic effect of the depressurizing action based on the rotation action of a rotating body, the heating action, and the convection action of the swirling laminar flow state. This invention relates to a reduced pressure equilibrium swirling convection heating method.

Conventionally, methods for heating the inside 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, the heating means for the purpose of drying requires a heat source other than the energy of the ventilation tank to obtain thermal energy, so that energy is not used effectively, and energy waste is an unavoidable disadvantage. was there.

This invention was made by focusing on the diagonal point, and the energy for blowing air can be transferred to the rotating body without using a special heat source to obtain thermal energy for the sealed hollow chamber. By converting the suction depressurization action based on the rotational action and the frictional heat generation action between the rotating body and the air when the depressurization is balanced, energy is used effectively without wastage, and the airflow with frictional heat is swirled. It is an object of the present invention to provide a reduced pressure equilibrium swirling convection heating method which achieves a laminar flow state and generates a convection action to achieve high efficiency and a short-time heating increasing effect.

In addition to the suction depressurizing action by the rotating body, the frictional heat generation action, and the convection action of the swirling laminar flow state, the invention also provides for vaporization by applying the intake action of outside air to the sealed hollow chamber. An object of the present invention is to provide a reduced-pressure equilibrium swirl convection heating method that improves the elimination of moisture and the promotion of drying action.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the reduced pressure balanced swirl convection heating method according to the present invention will be described below based on the apparatus shown in the drawings.

First, the structure of each figure will be described along with the symbols.

Reference numeral 1 denotes a rectangular cylindrical sealed hollow chamber with doors 2, 2 pivotally connected to form a double-opening structure, and heat insulating material 3 is interposed on the upper, lower, left and right outer circumferential walls to keep the room warm.

4 is a suction port opened in the center of the ceiling of hollow chamber 1, and
is arranged so that it can rotate freely.

As shown in the figure, the rotating body a is composed of rotary blades 6 such as propeller fans or scirocco blades 77 rotated by an electric motor 5, has a desired inclination angle, and has a desired angle of inclination. The direction of rotation is determined for suction and exhaust.

A frictional heat generating portion A is formed in the rotating region of the rotating body a.

Reference numeral 7 denotes a swirling laminar flow forming section, which includes a conical guide plate 8 that expands downward from the suction port 4 of the hollow chamber 1, and a center hole 9 that is disposed below and slightly apart from the guide plate 8. The airflow having the frictional heat obtained in the frictional heat generating section A is transmitted to both the plates 8 and 1.
A swirling laminar flow can be generated in the centrifugal direction from the gap g formed between the 0 and 0.

The rotary plate 10 has an upper end of a shaft rod 12 fixed at the center of a support rod 11 provided to intersect with the suction port 4, and a lower end of the shaft rod 12 projecting downward. 1
3, the guide plate 8
By fixing swash plates 15 tilting in a certain direction at four points of the curve, the airflow passing through the gap g is given directivity in the same direction as the rotating direction of the rotating body a, and the upper surface of the guide plate 8 is The four blades 16 receive the directionality of the airflow and move the rotating plate 1.
A rotating action is generated 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.

Reference numeral 17 denotes an outside air supply pipe having one end 17a opened at the lower part of the hollow chamber 1, and opening at the lower surface or lower side surface of the hollow chamber 1.

Reference numeral 18 denotes a funnel-shaped expansion plate centered on the opening end 17b that opens (upward) at the center of the hollow chamber 1 side of the outside air supply pipe 1T, and allows the outside air to flow into the chamber 1. In addition to improving the introduction effect, auxiliary heaters may be provided at necessary locations within the expansion plate 18 to heat the outside air.

Further, it is preferable that a dust removal filter 19 is removably provided in the outside air supply pipe 17.

20 is the regulating pulp of the outside air supply pipe 11, which is the eldest child 20;
The flow rate of the outside air passing through the inside of the outside air supply pipe 17 can be freely adjusted by a.

Although not shown, this control valve 20 is used as a general automatic control valve that can variably adjust the operating pressure conditions depending on the temperature inside the hollow chamber 1, the pressure difference between the inside and outside of the chamber 1, etc. It can be automatically opened and closed depending on the temperature or reduced pressure state of 1 to supply outside air.

21 is a viewing window for the hollow chamber 1; 22 is a display board for temperature, pressure, etc.; 23 is a support cylinder for the electric motor 5, which has an exhaust passage 24;

26 are blades provided at several locations on the lower surface of the rotating plate 10.

Note that although not shown in the drawings, the hollow chamber 1 is optionally provided with a shelf for placing the object to be heated, a support frame for supporting this shelf, etc.
Of course, it is possible to create a configuration that takes into consideration the ventilation effect.

In the configuration described above, when 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 blade 6.
The pressure difference between the inside and outside of the hollow chamber 1 gradually increases, but when the pressure difference reaches this pressure difference, an approximately equilibrium state is maintained.

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 rotating blade 60 and the size of the gap between the suction port 4 and the rotating blade 6. This is maintained as long as the blade 60 rotation action continues.

In this equilibrium state, air stagnation occurs in the frictional heat generating portion A within the rotation area of the rotating blade 6, and the rotating blade 6
As the frictional action continues to be repeated, frictional heat is generated and the temperature gradually rises.

This frictional heat propagates into the hollow chamber 1, allowing the interior to be heated to a desired temperature.

By the way, a guide plate 8 is fixed to the suction port 4 of the hollow chamber 1 in a conical shape, and a conical fixed plate 10 is provided in parallel with the guide plate 8 to form a gap g to form a swirling laminar flow forming section. 7, the airflow with frictional heat flows downward through this gap g in a laminar flow state, and at the same time turns into a swirling flow to rotate at a rotational speed of 10 under centrifugal action. A rapid airflow is generated along the inner circumferential wall of the hollow 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.

When the air pressure in the hollow chamber 1 is reduced by the rotation of the rotary vanes 6, the swirling laminar flow forming section 7 causes a convection effect of the airflow moving from the outer periphery toward the center. occurs, and the temperature within the chamber 1 can be uniformized rapidly to a desired set temperature.

Therefore, if an object to be dried, for example, is housed in the hollow chamber 1 as an object to be heated, the release of moisture contained in the object to be dried can be increased by the reduced pressure and the convection action of swirling air currents, and the moisture contained in the object to be dried can be increased. The heating action on the dried material promotes the release of free moisture from the material to be dried, thereby achieving a highly efficient drying action.

In addition, when the regulating valve 20 is opened to supply outside air from the outside air supply pipe 11 in the process of heating, the temperature inside the hollow chamber 1 decreases, but the temperature inside the hollow chamber 1 decreases by the amount of outside air supplied. Since the vaporized steam is removed by the rotating blade 6,
The drying effect can be further promoted.

Further, the temperature inside the hollow chamber 1 is set in advance to a desired temperature, and this set temperature and the control valve 20 of the outside air supply pipe 17 are
By linking the opening and closing operations of , outside air is intermittently introduced into the hollow chamber 1 through the outside air supply pipe 7, and automatic operation is performed under desired set temperature conditions. I can do it.

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 necessarily specified 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.

This invention, as shown in the diagonal above, suctions and exhausts the air inside 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. A method in which 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 made into a swirling laminar flow state and is caused to descend and convect within the hollow chamber. Since it is related to heat generation, there is no need for a direct heat source such as a conventional heater or fuel as a means of dissipating heat, and it is useful for so-called energy saving, and the temperature distribution within the hollow chamber can be made uniform in a short time. It has the following characteristics.

Furthermore, since frictional heat is obtained by the frictional action between the exhaust rotating body, that is, the rotary vane, and the air in an equilibrium state, the decompression effect and heat generation effect work synergistically and effectively only by the rotating action of the rotating body. Since the convection phenomenon can be forcibly generated by turning the airflow containing frictional heat into a swirling laminar flow state, the heating time can be significantly shortened, and it has the advantage that it can be widely used, especially in dryers.

Therefore, its application range is extremely wide, including drying agricultural and marine products such as shiitake mushrooms and 19-leaf cigarettes, clothing, and chemicals.

[Brief explanation of the drawing]

The figures show a specific device showing an embodiment of the depressurized equilibrium swirling convection heating method according to the present invention, in which FIG. 1 is a partially cutaway front view, and FIG. 2 is an enlarged side view of the same swirling laminar flow forming section. Figure, 3rd
The figure is an enlarged bottom view of the same as the above, and FIG. 4 is a partially cutaway side view of FIG. 2. 1...Hollow chamber, 4...Suction port, 7...
... swirling laminar flow forming section, 17 ... outside air supply pipe, 20 ... control valve, a ... rotating body, electric motor 5 having rotating blades 6 Consists of.

Claims (1)

[Scope of Claims] 1. The air in the sealed hollow chamber is forcibly sucked in by the rotation of a rotating body and exhausted into the room, 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 rotation of the rotating body is continued to promote friction with the air to generate frictional heat, and furthermore, the airflow having this frictional heat is swirled around the rotating body. A reduced-pressure equilibrium swirl convection heating method that maintains a laminar flow and forces the flow to descend along the inner circumferential wall of a hollow chamber, thereby generating convection within the hollow chamber. 2 The air in the sealed hollow chamber is forcibly sucked in and exhausted to the outside by the rotating action of the rotating body, and the pressure inside the room is reduced to keep the pressure difference between the inside and outside in a substantially constant equilibrium state, and this equilibrium state is maintained. At the same time, the rotating action of the rotating body is continued to promote frictional action with the air to generate frictional heat, and furthermore, the airflow having this frictional heat is kept in a laminar flow state swirling around the rotating body. The air is forced to descend along the inner circumferential wall of the hollow chamber, thereby creating convection within the hollow chamber, and outside air is introduced directly or heated to the required temperature from a desired location in the hollow chamber. Reduced pressure equilibrium swirl convection heating method. 3 The air inside the sealed hollow chamber is forcibly sucked in by the rotating action of the rotating body and exhausted to the outside, reducing the pressure in the room and keeping the pressure difference between the inside and outside in a substantially constant equilibrium state, and maintaining this equilibrium state. At the same time, the rotating action of the rotating body is continued to promote frictional action with the air to generate frictional heat, and furthermore, the airflow having this frictional heat is kept in a laminar flow state swirling around the rotating body. It is forced to descend along the inner circumferential wall of the hollow chamber, thereby allowing a convection effect to occur within the hollow chamber, and furthermore, the regulating pulp provided in the outside air supply pipe of the hollow chamber is adjusted in relation to the set temperature inside the hollow chamber. A reduced pressure equilibrium swirl convection heating method that allows the temperature inside a hollow chamber to be constantly maintained at a set temperature by intermittently introducing outside air by opening and closing operations.