JPS6033235B2 - Reduced pressure equilibrium forced rotation 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 heat generation of frictional heat generated by the friction between the air and the rotating body. In the reduced pressure equilibrium heating drying method and its device, which effectively dries the material to be dried by the effect of convection, swirling convection, and the effect of introducing outside air, the heated airflow in the hollow chamber is controlled to have a uniform temperature distribution. The present invention relates to a reduced-pressure equilibrium forced swirling convection heating drying method and an apparatus therefor, which enables effective swirling convection to dry a material to be dried quickly and with high quality.

The applicant has previously proposed a system that uses the depressurizing effect of forcibly sucking and exhausting the air in the sealed hollow chamber by the rotation of the rotating body, and the heating effect of frictional heat generated by the friction between the air and the rotating body. We have developed a new vacuum equilibrium heating method and device that does not use existing heat sources such as oil, gas or electric heaters.

This invention is based on the above-mentioned invention and has been made by utilizing the above-mentioned invention, and is a novel depressurized equilibrium that has a uniform temperature distribution and a remarkable drying effect by forcibly swirling and convecting the air flow in a hollow chamber. The present invention provides a swirling convection heating drying method and an apparatus therefor. An embodiment of the present invention will be described below in detail with reference to the configuration shown in the drawings.

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 the rotating body a
It has a decompression friction heat generation mechanism x which is rotatably arranged.

As shown in the figure, the rotating body a has a desired inclination angle and is configured by rotary blades 6 such as a propeller fan or a sirocco fan rotated by an electric motor 5, and sucks air in the hollow chamber 1. The direction of rotation is determined to exhaust air. A frictional heat generating portion A is formed in the rotating region of the rotating body a. Reference numeral 7 denotes a rotary impeller disposed opposite to the rotating body a of the decompression frictional heat generating mechanism X with a slight interval therebetween, and a driven rotation mechanism Y is constituted by the rotary impeller 7 and a suction blade 8 that rotates integrally with the rotary impeller 7. ing.

That is, an orthogonal support frame 9 is temporarily installed and fixed at the lower end of the suction port 4, and the center of the support frame 9 is aligned with the center of the rotating body a to form a bearing part 10. The rotary impeller 7 and the suction blades 8 below are screwed and fixed to the shaft punch 11 so that they can rotate together.

The rotary impeller 7 is composed of a ring 12 with a diameter slightly smaller than the diameter of the suction port 4 and a large number of blades 13 protruding from the outer periphery of the ring 12.
A large number of air chambers 14 surrounded by the blades 13 can be formed. Reference numeral 15 denotes a bent portion in which the upper end of the blade 13 is bent obliquely from top to bottom, and is configured to improve rotational performance.

16 are four branches that support the middle mounting part 17, and 18 are suction blades scattered inside the ring 12, which are installed with the same angle of inclination in the same direction so as to suck up the downward airflow. There is.

Furthermore, the rotary blades 8 may have a normal fan structure, as long as the blades 8 are configured to rotate in a direction that sucks up the air in the hollow chamber 1 upward.

Additionally, a cap-shaped inclined plate 19 having an annular portion 19a that can support both ends of the support frame 9 is fixed to the outside of the rotary blade 8, and it suddenly restricts the suction area of the rotary blade 8. be. Although not shown, this inclined plate 19 is rotatably fixed to the shaft village 11 in the same way as the rotary blade 8.
It is also possible to install slanted blades exhibiting a fan function on the lower surface of the fan to dramatically restrict the suction effect and suction area in the same manner as described above.

Reference numeral 20 denotes a conical guide plate that expands downward from the suction port 4 constituting the forced swirl convection guide mechanism Z, and is similar to the inclined plate 19.
A swirling flow is formed between the two.

21 is a regulating plate that regulates the flow direction of the swirling flow; an inclined plate 19;
Four of them are arranged vertically upward and between both plates 19 and 20.

Reference numeral 22 denotes a support cylinder for the electric motor 5, which has an exhaust passage 23, and a silencer cylinder 24 at the closed end of the support cylinder 22.

Reference numeral 25 denotes an outside air introduction mechanism located at the bottom of the hollow chamber 1. If necessary, an auxiliary heater is built in, and it can be used to enhance the temperature raising effect at the initial stage of heating, or it can also be used to control the temperature with a thermostat or the like. be.

Furthermore, the outside air introduction mechanism 25 is provided with a control valve 26 in the middle thereof, and can be used as an automatic control valve that can be operated manually or automatically by detecting the indoor temperature or the pressure difference between the indoor and outdoor. Also available. Reference numeral 27 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, allowing ventilation drying. This is to make the effect effective.

28 is a peephole, and 29 is a control box equipped with various instruments and a control panel.

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 decompression frictional heat generation mechanism × operates, and 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.
When a certain pressure difference is reached, 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 rotary blade 6 and the size of the gap between the suction port 4 and the rotary blade 6. This is maintained as long as the rotating action of the rotating blade 6 continues. In this equilibrium state, a phenomenon of air stagnation 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 the temperature gradually rises. do. By the way, a driven rotation mechanism Y is provided opposite to the decompression friction heat generation mechanism Since the rotary impeller 7 of the driven rotation mechanism Y is operated to rotate in the same direction, the gas in the air chamber 14 surrounded by the ring 12 of the rotary impeller 7, the blades 13, and the inner wall of the suction port 4 is forced. to rotate).

The heated airflow in the air chamber 14 subjected to this forced swirling action is transferred to the guide plate 20 and the inclined plate 1 by the forced swirling convection guide mechanism Z.
The swirling flow is introduced into the space formed by the regulating plate 21 and is further discharged toward the outer peripheral inner wall of the hollow chamber 1. On the other hand, in the driven rotation mechanism Y, the airflow located below the rotary vane 8 is forcibly sucked upward by the action of the rotary vane 8 which rotates integrally with the rotation of the rotary impeller 7, and is sucked up by the suction vane 18 of the ring 12. In exchange for the effect, the frictional heat generating portion A of the rotating blade 6 of the decompression frictional heat generating mechanism X
The air is forcibly fed into the air, where it replaces the airflow whose temperature has already risen, and is discharged by the rotary impeller 7 forming a swirling airflow downward as described above. Therefore, due to the effects of the driven rotation mechanism Y and the forced swirling convection guide mechanism Z, the airflow in the hollow chamber 1 is caused by a forced convection action that descends from the outer circumferential direction and rises from the center, and a spiral swirling action (also known as a spiral action). (recognized).

In this manner, when the air pressure in the hollow chamber 1 is subjected to the depressurizing effect due to the rotation of the rotary vane 6, the swirling airflow is lowered from the outer circumferential direction, and after once descending, it moves from the lower outer circumference of the hollow chamber 1 toward the center. Since the convection action of the air current is forcibly generated, the temperature inside the chamber 1 can be uniformized rapidly to a desired set temperature.

In addition, the convecting and overflowing air current uniformly enters and acts on the shelves 27 arranged in multiple stages, thereby heating and drying the entire area under reduced pressure. The vaporized moisture is discharged to the outside through the suction port 4, but if necessary, the control valve 26 of the outside air introduction mechanism 25
When outside air is introduced by operating the , the outside air is fed into the hollow chamber 1, and the vaporized moisture corresponding to the fed air is discharged to perform an effective drying action. Therefore, the shelf 27 in the hollow chamber 1
The moisture contained in the drying material above is increased due to the reduced pressure effect and the swirling convection effect, and the release of free moisture from the drying material is promoted by the heating effect on the drying material due to the rise in room temperature. Due to the effective evacuation of the vaporized and evaporated components by the introduction of heated outside air, the material to be dried in the entire area of the hollow chamber 1 can be dried in a short period of time and with high efficiency.

In particular, the airflow acts on the shelves 27 throughout the hollow chamber 1 due to the swirling convection effect, and the temperature distribution becomes uniform and the drying effect is further promoted by introducing outside air in a continuous manner. It is possible to obtain a beautiful dried product that retains its primary color without any discoloration.

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 subjected to effective swirling action and convection action using a driven rotation mechanism and a forced swirling convection guide mechanism. After the desired drying operation, heated or unheated outside air is supplied by the outside air introduction mechanism to effectively dry the object, so the drying effect is greatly improved. Moreover, it is possible to obtain high-quality dried products, and it eliminates the use of conventional direct heat sources such as heaters and fuel.
It performs an effective drying action through a decompression action and a convection action due to swirling swirl, and has the feature that it can be effectively used for all types of drying actions.

[Brief explanation of the drawing]

The figures show an embodiment of the depressurized balanced swirl convection heating drying apparatus according to the present invention, in which Fig. 1 is a partially cutaway front view of the whole, Fig. 2 is an enlarged sectional view of the main part of the same, and Fig. 3 is an enlarged plan view of the rotary impeller, Fig. 4 is an enlarged side view, and Fig. 5 is the V of Fig. 3.
-V line sectional view, Fig. 6 is an enlarged plan view showing the relationship between the support frame of the driven rotation mechanism and the inclined plate, Fig. 7 is a skin-to-skin sectional view of the same as above, and Fig. 8 is a plane of only the inclined plate. FIG. 9 is a front view of the same as above. 1... Sealed hollow chamber, 4... Suction port of reduced pressure friction heat generation mechanism X, 7... Rotary impeller of driven rotation mechanism Y, 8...・Rotating blade, 12...
・Link, 18. ．． ...Suction blade, 19...
- Shape-shaped inclined plate, 20...Guide plate of forced rotation convection guide mechanism Z, 21...Regulation plate, a...
A shows a rotating body and is composed of an electric motor 5 and a rotating blade 6.
...Frictional heat generating part. Figure 1 Figure 3 Figure 4 Figure 5 Figure 7 Figure N Shigeru Figure 6 Figure 8

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 transformed into a swirling flow around the rotating body. The gas in the hollow chamber is sucked from below the center of the rotating body, and a forced swirling convection is generated that diffuses and descends in a vortex shape toward the four circumferences of the hollow chamber, thereby heating the material to be dried in the hollow chamber and as needed. A vacuum-equilibrium swirl convection heating drying method that dries the material to be dried by introducing outside air and discharging vaporized moisture. 2 A vacuum friction heat generation mechanism and an outside air introduction mechanism using a rotary body are provided in a sealed hollow chamber that stores the material to be dried, and the hollow chamber is heated in a vacuum equilibrium state, and the rotor of the vacuum friction heat generation mechanism is heated. A driven rotation mechanism is provided at a position opposite to the
The decompression balanced swirl convection heating drying device is further provided with a forced swirl convection guide mechanism.