JP2002372369A - Pressure reducing dryer and cleaning method of pressure reduced chamber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure reducing dryer in which cleaning of the pressure reduced chamber, i.e., the drying chamber, can be carried out automatically and efficiently while saving the labor and enhancing the rate of operation of the dryer. SOLUTION: The pressure reducing dryer for drying an article W by heating a drying chamber 16 containing the article W under reduced pressure comprises a cleaner 35 for removing matters adhering to the inner wall face of the drying chamber 16 by a wind pressure generated by supplying heated water Ya into the drying chamber 16 under reduced pressure and evaporating it instantaneously.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reduced-pressure drying apparatus for drying, for example, food waste and recycling it into fertilizer and the like, and a method for cleaning a reduced-pressure chamber.

[0002]

2. Description of the Related Art In recent years, food waste generated in food production has been dried and recycled into fertilizers and the like, instead of being simply disposed of.

As this type of drying apparatus, there is a reduced-pressure drying apparatus in which a drying chamber for containing food waste to be dried is reduced in pressure to lower the boiling point of water, thereby improving drying efficiency.

[0004] However, since this decompression drying apparatus is configured to heat the outside of the drying apparatus main body with a heater, steam, or the like and use the inner wall surface of the drying chamber as a heat transfer surface, the drying apparatus is dried. If food waste adheres to the inner wall surface of the room, the thermal efficiency is reduced, causing a problem that the drying time is delayed.

Therefore, conventionally, every time food waste adheres to the inner wall surface of the drying chamber, the drying chamber is manually cleaned.

[0006]

As described above, the food waste introduced into the drying chamber often adheres to the inner wall surface of the drying chamber during drying. Every time food waste adheres to the inner wall surface, the inside of the drying chamber is manually cleaned, so that the cleaning work is not only troublesome, but also takes time, resulting in a reduction in the operation rate of the apparatus. .

The present invention has been made based on the above circumstances, and an object of the present invention is to perform washing in a drying chamber, which is a decompression chamber, automatically and efficiently without relying on humans.
It is an object of the present invention to provide a reduced-pressure drying apparatus and a method for cleaning the inside of a reduced-pressure chamber, which can save labor and improve the operation rate of the apparatus.

[0008]

Means for Solving the Problems The present invention solves the above-mentioned problems, and as a means for achieving the object, heats a drying chamber accommodating a material to be dried under reduced pressure to remove the material to be dried. In a reduced-pressure drying apparatus for drying, cleaning is performed in which heated water is supplied into the drying chamber in a reduced pressure state and instantaneously evaporated, thereby removing attached matter adhering to the inner wall surface of the drying chamber by the wind pressure. A device is provided.

As described above, since the cleaning apparatus is provided, the drying chamber is not manually cleaned as in the related art, so that it is possible to save labor. In addition, since the cleaning liquid is supplied into the drying chamber to evaporate instantaneously, and the steam is used to wash off the deposits adhering to the inner wall surface of the drying chamber, cleaning can be performed efficiently and in a short time. Thus, it is possible to improve the operation rate of the device.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a decompression type drying apparatus. Reference numeral 11 denotes a drying apparatus main body, which has a cylindrical shape in its entirety.
The size is 60 mm and the height is 1000 mm.

In the upper part of the main body 11 of the drying apparatus, there is provided an inlet 12 for introducing a material W to be dried such as food waste. At the lower part of the drying device main body 11, an outlet 13 for discharging the object to be dried W is provided. The inlet 12 and the outlet 13 are closed by the lids 12a and 13a when the object to be dried W is dried.

The drying device main body 11 has a double-walled structure in which a side wall portion includes an inner wall 11a and an outer wall 11b, and a heat medium passage for filling a heat medium X such as steam in a gap between the inner wall 11a and the outer wall 11b. 14 as well as a drying chamber 16 having the inner peripheral surface of the inner wall 11a as the heat transfer surface 15.

The heating medium passage 14 has a lower end connected to the heating medium supply pipe 17 and an upper end connected to the heating medium outlet pipe 18 to constitute heating means 19.
Is supplied from the heat medium outlet pipe 18 and is discharged from the heat medium outlet pipe 18, the inner peripheral surface of the inner wall 11a,
Is heated.

Further, the stirring member 2 is provided in the drying chamber 16.
0 is provided.

The stirring member 20 includes a rotating shaft 25 provided at the center of the drying chamber 16 and a stirring blade 27 attached to the rotating shaft 25 via a plurality of support arms 26 and surrounding the rotating shaft 25 in a spiral shape. It is composed of The rotation axis 25 is
The upper end is supported by a bearing device 28 mounted on the upper wall portion 11c of the drying device main body 11, and the lower end is connected to a motor 29 mounted on the lower wall portion 11d of the drying device main body 11.

Then, the stirring member 2 constructed as described above is used.
Numeral 0 is rotated in the direction of the arrow at a constant speed by the driving force of the motor 29, so that the object to be dried W in the drying chamber 16 is continuously scraped up and repeatedly brought into contact with the heat transfer surface 15. I have.

The upper wall portion 11c of the drying device main body 11 is also provided.
Is provided with a decompression device 30 that decompresses the inside of the drying chamber 16 to lower the boiling point of water in the drying chamber 16. That is, it is connected to the vacuum pump 31 and the drying chamber 16
An exhaust pipe 32 communicating with the exhaust pipe 32 is provided.

Further, the upper wall portion 11 of the drying device main body 11
c, a cleaning device 3 for automatically and efficiently cleaning the drying chamber 16 which is a decompression chamber without relying on humans.
5 is attached.

The cleaning device 35 has a configuration as shown in detail in FIG. That is, in the figure, reference numeral 40 denotes an apparatus main body mounted on the upper wall portion 11c of the drying apparatus main body 11,
A water storage chamber 41 is formed inside the apparatus main body 40. The lower end of the water storage chamber 41 communicates with a water supply port 42 that opens into the drying chamber 16, and the upper end of the water storage chamber 41 is connected to a water supply pipe 44 via an open / close valve 43.

The water supply port 41 is provided with a poppet valve 45 as an on-off valve. This poppet valve 45 is
Actuator 4 serving as a valve operating mechanism via rod 46
7 to open and close the water supply port 42.

The outer periphery of the apparatus main body 40 corresponding to the water storage chamber 42 has water Ya stored in the water storage chamber 42.
Is provided with a heater 48 for heating the heater to a predetermined temperature.

Next, the operation of the thus-configured drying apparatus with a washing device of the present invention will be described.

As the stirring member 20 rotates in the direction of the arrow, the material W to be dried in the drying chamber 16 is subjected to centrifugal force by the spiral stirring blades 27, and is transferred to the heat transfer surface 15 which is the inner wall surface of the drying chamber 16. While being pressed, it is lifted up from below, and is heated by the heat of the heat transfer surface 15 during that time.

Then, when the upper end of the stirring blade 27 is released from the centrifugal force and the upward propulsion force, the material to be dried W passes through the gap between the inner diameter portion of the stirring blade 27 and the rotating shaft 25 and the drying chamber 1.
6 and falls toward the bottom in 6, and by the stirring blade 27,
It is again lifted up and repeats this repetitive operation.

At this time, the inside of the drying chamber 16 is
0 is maintained in a reduced-pressure atmosphere so as to lower the boiling point of water, whereby efficient drying is performed.

On the other hand, in such a drying process, a part of the material to be dried W adheres to the heat transfer surface 15 and the stirring blade 27 which are the inner wall surfaces of the drying chamber 16.

This decompression type drying device is provided with a drying device main body 11.
Is heated by steam from the outside of the drying chamber 16 so that the inner wall surface of the drying chamber 16 serves as the heat transfer surface 15.
When the object W to be dried adheres to the inner wall surface of the slab, the thermal efficiency is reduced, which causes a delay in the drying time.

However, the reduced-pressure drying apparatus according to the present invention is provided with a cleaning device 35 so that the material W to be dried can be removed from the heat transfer surface 15 or the inner wall surface of the drying chamber 16 during drying. When it adheres to the stirring blades 27, the drying chamber 1
6 can be washed without relying on humans.

That is, after the drying process, after the object to be dried W is discharged from the main body 11 of the drying apparatus, by operating a switch (not shown), the actuator 47 which is a valve operating mechanism of the cleaning apparatus 35 is operated, and the water supply port is opened. The poppet valve 45 that opens and closes 42 is lowered to the open position (the position indicated by the two-dot chain line in FIG. 2).

As a result, the water supply port 42 of the cleaning device 35 is opened, and the water Ya in the water storage chamber 41 heated to a predetermined temperature by the heater 48 is supplied into the drying chamber 16. In this manner, the water (high-temperature water) Y in the heated storage chamber supplied into the drying chamber 16 in a reduced pressure state.
a evaporates instantaneously in the drying chamber 16.

At this time, the high wind pressure (small steam explosion) generated by the steam is applied to the drying chamber 16.
Acting on the inner wall surfaces and the stirring blades 27, the adhering matter (dry matter W) adhering thereto is removed.

Next, a specific example will be described.

That is, 85 wt.
% Of the material to be dried (food waste) W in an amount of 30 kg, and the inside of the drying chamber 16 is set to a reduced-pressure atmosphere of -93 KPa and a temperature of 65 ° C.
And dried for 2 hours.

After the drying process, the water content of the material to be dried W is 15 wt.
%Met.

After the material W to be dried is discharged from the main body 11 of the drying apparatus, the attached material (the material W to be dried) is 1 to the inner wall surface (heat transfer surface 15) of the drying chamber 16 and the surface of the stirring blade 27. 2m
m.

However, in order to remove these deposits,
The inside of the drying chamber 16 is set to −93 KPa, the temperature is set to 65 ° C., the stirring member 20 is rotated for 2 minutes, and the water (high-temperature water) Ya in the water storage chamber 41 heated to 90 ° C. from the cleaning device 35 is dried by 1000 cc. It was supplied into the chamber 16.

After the completion of the stirring, no adhering matter was observed on the inner wall in the drying chamber 16, and a good condition was obtained.

It is preferable that the temperature of the water Ya is higher than the temperature at which the water Ya evaporates in the drying chamber 16 by 25 ° C. or more.

On the other hand, for comparison, when the above-mentioned washing is not carried out and the next drying treatment is carried out with the object W to be dried attached, the drying time is 3 hours and 10 minutes and the water content of the object W to be dried is 3 hours and 10 minutes. Was 18 wt%, and the result was that the drying time and the degree of drying were inferior to those of 2 hours and 15 wt% of moisture in the state of no adhesion.

Further, as described above, after heating the water to a temperature at which the water evaporates in the decompressed decompression chamber, the water is supplied into the decompression chamber to evaporate instantaneously, and at this time the high wind pressure generated by the steam is used. Since the method is a cleaning method for cleaning the deposits, it is needless to say that the present invention may be applied not only to a reduced-pressure drying apparatus but also to cleaning of a reduced-pressure chamber of another apparatus.

In addition, the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.

[0043]

As described above, the present invention relates to a reduced-pressure drying apparatus for drying a dried object by heating the drying chamber containing the object to be dried under reduced pressure. Since the washing apparatus is provided to remove the deposits attached to the inner wall surface of the drying chamber by the wind pressure by supplying the drying chamber and evaporating instantaneously,
It is possible to perform the washing in the drying chamber, which is a decompression chamber, automatically and efficiently without relying on humans, thereby achieving an effect of saving labor and improving the operation rate of the apparatus.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a reduced-pressure drying apparatus schematically showing an example of an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part of the cleaning device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 ... Drying apparatus main body 15 ... Heat transfer surface 16 ... Drying chamber 20 ... Stirring member 30 ... Decompression device 31 ... Vacuum pump 35 ... Cleaning device 41 ... Water storage chamber 42 ... Water supply port 43 ... Open / close valve 44 ... Water supply pipe 45 ... Poppet valve (Open / close valve) 47 ... actuator (valve operating mechanism) 48 ... heater W ... substance to be dried X ... heat medium Y, Ya ... water

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F26B 3/20 F26B 11/16 9/06 25/04 11/16 B09B 3/00 303M 25/04 ZAB ( 72) Inventor Takashi Hirose 2068-3 Ooka, Numazu City, Shizuoka Prefecture Inside Toshiba Machine Co., Ltd. (72) Inventor Taketoshi Ishikawa 2068-3 Ooka, Numazu City, Shizuoka Prefecture Toshiba Machine Mytec Numauchi F-term (reference) 3B116 AA32 AB51 BB21 BB82 BC00 CC03 3B201 AA47 AB51 BB82 BC00 CC11 CD11 3L113 AA07 AB05 AC05 AC08 AC24 AC48 AC58 AC63 AC67 AC83 BA01 CA08 CA10 CB05 CB16 CB29 CB34 CB39 DA04 DA08 DA10 DA11 DA22 4D004 AA04 BA04 CA42 CB04

Claims (3)

[Claims] 1. A reduced-pressure drying apparatus for drying an object to be dried by heating the drying chamber containing the object to be dried under reduced pressure, wherein heated water is supplied to the drying chamber in a reduced pressure state, and A drying device for removing the deposits adhering to the inner wall surface of the drying chamber by the wind pressure by evaporating the drying device. 2. The cleaning device according to claim 1, wherein the water supply port is provided facing the drying chamber, a water storage chamber communicating with the water supply port, and a temperature at which the water in the water storage chamber evaporates instantaneously in the drying chamber. A heater for opening and closing the water supply port, and an opening and closing valve for opening the water supply port and supplying heated water into the drying chamber during cleaning. Item 7. A reduced-pressure drying apparatus according to Item 1. 3. A cleaning method for cleaning an adhering substance adhering to an inner wall surface in a reduced-pressure chamber, comprising: heating water to a temperature at which the reduced pressure inside the reduced-pressure chamber evaporates;
A method for cleaning a decompression chamber, comprising supplying the water to the decompression chamber and evaporating the water instantaneously, and cleaning the deposits with a high wind pressure generated by the steam at this time.