JPS638801B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention has a rotating body disposed in a vacuum container and equipped with an evaporation surface for receiving the stock solution to be processed, and the stock solution to be processed is supplied to the evaporation surface of the rotating body to perform distillation. The present invention relates to a centrifugal evaporator that performs necessary processes such as concentration, deaeration, dehydration, deoxidation, and deodorization.

In this type of centrifugal evaporator, the centrifugal force generated by the rotation of a rotating body with an evaporation surface spreads the stock solution supplied onto the evaporation surface in an extremely thin and uniform film, resulting in high evaporation efficiency. is obtained. An electric heating method or a medium heating method is usually used to heat the evaporation surface of the rotating body. In the electric heating method, for example, as shown in FIG. 1, a heating heater 4 is placed adjacent to the back side of a funnel-shaped evaporation surface 3 of a rotating body 2 placed in a vacuum container 1. It is configured to heat the evaporation surface 3 by applying energy to the evaporation surface 3. In the medium heating method, a heating medium is introduced from outside the vacuum container along the rotation axis of the rotating body, and heat is applied to the evaporation surface. However, all of these known methods have poor heating efficiency, and the electric heater method has the disadvantage that failures are likely to occur due to breakage of the heater wire, adhesion of evaporated matter from the object, etc. In addition, the medium heating method requires a heating medium circulation path to be formed along the rotational axis of the rotating body, which has the disadvantage that the structure is complicated in addition to considerations such as heat insulation, cooling, and sealing.

The purpose of this invention is to directly heat the evaporation surface of a rotating body using microwave heating, thereby eliminating the drawbacks of conventional electric heater methods and medium heating methods. The purpose of the present invention is to provide a type centrifugal evaporator.

In order to achieve this object, in the microwave heating type centrifugal evaporator according to the present invention, a microwave generator is provided outside the vacuum container, and the microwave from the microwave generator is incident on the rotating body. The evaporation surface is configured to be heated directly.

Preferably, in the apparatus of the present invention, the interior of the rotating body provided with the evaporation surface is formed into a cavity, and this cavity can be communicated with a microwave generator provided outside the vacuum container.

Embodiments of the present invention will be described below with reference to FIGS. 2 and 3 of the accompanying drawings.

FIG. 2 shows an embodiment of the present invention, in which a vacuum vessel 5 is provided with a hollow rotating body 7 having a funnel-shaped evaporation surface 6, and an upper wall of the vacuum vessel 5 is provided with a hollow rotating body 7. A processing liquid inlet section 8 is provided, and this inlet section 8
From there, a processing liquid supply pipe 9 extends toward the top of the funnel-shaped evaporation surface 6. Further, a distillate outlet 10 and a residual liquid outlet 11 are provided on the lower wall of the vacuum container 5. Although not shown in the drawings, the vacuum container 5 is naturally equipped with an exhaust port.

The hollow rotating body 7 is connected to a hollow rotating shaft 13 extending through the rear wall of the vacuum vessel 5, which hollow rotating shaft 13 is driven by a motor 15 via a movement mechanism 14. The inside of the hollow rotating shaft 13 forms a waveguide, one end of which communicates with the inside of the hollow rotating body 7, and the other end connected to a suitable microwave generator 17 via a connecting pipe 16. In addition, in FIG. 2, symbols 18 and 19 are bearings of the hollow rotating shaft 13,
Of course, these bearings may be of sealed structure.

With this configuration, the desired microwaves generated by the microwave generator 17 pass through the connecting tube 16 and the hollow rotating shaft 13, enter the hollow rotating body 7, and the evaporation surface Heat 6 directly from the back side. The temperature of the evaporation surface 6 can be easily and accurately adjusted over a wide range simply by controlling the output of the microwave generator 17 accordingly.

Referring now to FIG. 3, there is shown an alternative embodiment of the invention, in this case configured for microwave heating of the funnel-shaped evaporation surface 21 of the rotating body 20 through the process space within the vacuum vessel 5. Ru. That is, in this modified embodiment, the microwave from the microwave generator 22 is transmitted via the waveguide 23 to the funnel-shaped evaporation surface 21 of the rotating body 20 from the supply port 24 provided on the front wall of the vacuum container 5. It is made so that the light is incident towards the direction of the light. In this case, although not shown in the drawings, the microwave supply port 24 is preferably configured to be protected from evaporated matter. In addition, in the illustrated embodiment, the evaporation surface 2
Although the microwave is configured to be incident on the microwave from the front, the microwave may be incident from one direction or a plurality of directions if necessary.

As explained above, according to this invention,
Since it is configured to directly heat the evaporation surface of the rotating body, it has better heating efficiency than conventional methods, and because it does not require an electric heater, it can prevent malfunctions such as disconnection or deterioration of heating characteristics due to adhesion of evaporated matter. Moreover, the heating temperature can be easily and accurately controlled.
Further, there is no need to use a complicated heat input mechanism such as a medium heating method, and the microwave can be input simply by using a waveguide, so the structure can be extremely simplified.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing a conventional centrifugal evaporator, FIG. 2 is a schematic sectional view showing an embodiment of the microwave heating type centrifugal evaporator according to the present invention, and FIG. 3 is a modified embodiment of the invention. FIG. In the figure, 6, 21... evaporation surface, 7, 20... rotating body, 17, 22... microwave generator, 13,
16, 23... Waveguide.

Claims (1)

[Scope of Claims] 1. A rotary body disposed in a vacuum container and equipped with an evaporation surface for receiving a stock solution to be processed, and supplying the stock solution to be processed to the evaporation surface of the rotary body for distillation, concentration,
In a centrifugal evaporator that performs necessary processes such as deaeration, dehydration, deoxidation, and deodorization, a microwave generator is installed outside the vacuum container, and the microwaves from this microwave generator are incident on the rotating body. A microwave heating type centrifugal evaporator characterized in that it is configured to directly heat the evaporation surface. 2. The device according to claim 1, wherein the rotating body having an evaporation surface has a cavity inside, and the cavity is communicated with a microwave generator provided outside the vacuum container.