JPH0771441B2 - Powder temperature controller - Google Patents

Description

TECHNICAL FIELD The present invention relates to a powder temperature adjusting device that cools or heats powder or granules such as wheat flour while stirring.

<Prior Art> The use of the powder temperature adjusting device of the present invention is not limited to the temperature adjustment of edible powder such as wheat flour, but the temperature adjustment of wheat flour will be representatively described below as an example.

Breads such as bread, udon, and cakes are produced by adding water or other liquid to flour and kneading it.
The finished temperature of the dough has a great influence on the product quality.

Of these, the bread and udon dough is manufactured with 30 to 60 flour.
Since wt% water is added and kneaded, adjustment of the finished temperature of the dough can be performed relatively easily by adjusting the temperature of the mixer and mainly by selecting the temperature of water to be added.

On the other hand, the production of dough for confectionery such as cakes is carried out by adding flour to a mixture of whipped raw eggs and mixing, and since water is not added as described above, adjustment of the finished temperature of the dough is performed. This was done by adjusting (cooling) the temperature of the flour. The specific method was to put the flour together with the bag in a refrigerator and store it for 2 to 3 days to keep it at a low temperature.

However, this method requires a facility such as a refrigerator and has a drawback that it takes time to cool the wheat flour. Therefore, a powder temperature adjusting device for cooling the powder while stirring the powder has been proposed. In this device, a flow path (called a jacket) for cooling liquid or the like is formed on the outer circumference of the stirring tank, and the cooling liquid is circulated in the flow path to cool the powder in the tank and the stirring is rotated in the stirring tank. The blades stir the powder to increase the cooling efficiency.

However, in this powder temperature adjusting device, powder is accumulated from the structure of the stirring blade on the inner wall surface of the tank which is the cooling surface to form a layer of compacted powder. There is a drawback that the cooling efficiency is lowered because the function is exhibited.

Such a drawback is the same when heating the powder.

<Problems to be Solved by the Invention> An object of the present invention is to solve the above-mentioned drawbacks of the prior art and to provide a powder temperature adjusting device capable of efficiently cooling or heating powder in a short time. Especially.

<Means for Solving Problems> Such an object is achieved by the present invention described below.

That is, according to the present invention, only the transporting air is supplied from the powder that is charged in a mixed state together with the charging port and the transporting air into which the powder that has been pneumatically transported by the pressurized dry air dehumidified by the dehumidifying device is charged to the outside. It is equipped with a bag filter that discharges to the inside of the tank and a powder discharge port that discharges the powder adjusted to a predetermined temperature at the bottom, and it is installed horizontally and along the circumference of the tank so that the predetermined part of the inner wall surface of the tank becomes the heat conducting surface. An agitation tank in which a flow path for a cooling liquid or a heating liquid is formed, and a horizontal rotation shaft that is rotatably supported at both ends of the agitation tank, is rotatably housed in the agitation tank, and has a spiral shape. At least two stirring blades having opposite twist directions, and at least one stirring blade attached to the stirring blade so as to move along the vicinity of the heat conduction surface of the stirring tank and installed to cover the entire inner length of the stirring tank. The powder scraping member, there is provided a powder temperature adjusting apparatus characterized by having a drive means for rotating the stirring blade.

Further, the powder scraping member is preferably a rod-shaped scraper.

Hereinafter, a preferred embodiment of the powder temperature adjusting device of the present invention shown in the accompanying drawings will be described in detail.

FIG. 1 is a partial cross-sectional side view of a powder temperature adjusting device 1 of the present invention.

As shown in FIG. 1, a channel 4 (jacket) is formed around the stirring tank 2 in which the powder input port 5 and the discharge port 6 are formed except for the powder input port 5 and the discharge port 6. Therefore, for example, by circulating the cooling liquid 15 in the flow path 4, the powder in the stirring tank can be cooled from the heat conducting surface, that is, the cooling surface 3.

Note that the device of the present invention is not limited to the case of being used for cooling powder, and it is also possible to heat the powder in the stirring tank 2 by circulating a heating liquid such as hot water in the flow path 4. But
In the following description, a case of cooling the powder using a cooling liquid will be described as a representative.

A cooling liquid supply port 7 and a cooling liquid discharge port 8 are formed at predetermined positions in the flow path 4, and a cooling liquid such as cold water supplied from the cooling liquid supply port 7 by a pump or the like (not shown). 15 circulates in the flow path 4 to cool the inner peripheral wall surface (cooling surface) 3 of the stirring tank 2 and is discharged from the cooling liquid discharge port 8.

The supply of the cooling liquid into the flow path 4 is performed, for example, as shown in FIG. 3, by a cooling liquid circulation path 26 having a pump 27 and a cooling device 28.
The cooling liquid cooled to a predetermined temperature by the cooling device 28 may be continuously supplied.

Bearings 13, 13 are installed at both end portions of the stirring tank 2, and the rotary shaft 9 is supported by these bearings.

Inside the stirring tank 2, two types of large and small ribbon-shaped first stirring blades 10 and second stirring blades 11 fixed to the rotating shaft 9 are rotatably housed. By rotating these stirring blades 10 and 11 in the stirring tank 2, the powder in the tank is stirred,
It is designed to improve the cooling efficiency of powder.

The first stirring blade 10 on the outer side and the second stirring blade 11 on the inner side
Has a spiral twisting direction opposite to each other, and when the rotating shaft 9 rotates in a certain direction, the powder moves in opposite directions in the vicinity of the central part and the vicinity of the outer peripheral part in the stirring tank 2 to improve stirring efficiency. It is designed to increase.

At least one powder scraping member, that is, a rod-shaped scraper 12 in the example shown in FIG. 1, that rotates along the vicinity of the cooling surface 3 of the stirring tank is attached to a predetermined position of the first stirring blade 10. There is.

A constant gap is formed between the top of the first stirring blade 10 and the cooling surface 3, and powder is accumulated in this gap, and a layer of the compacted powder is attached to the cooling surface 3, Since the powder layer hinders heat exchange on the cooling surface 3, the cooling efficiency is reduced. However, by providing the scraper 12, this scraper 12
Moves near the cooling surface to scrape off the compacted powder layer, so that the heat exchange is smoothly performed on the cooling surface 3, thus preventing a decrease in cooling efficiency.

The scraper 12 is installed such that the gap distance between the scraper 12 and the cooling surface 3 is zero, that is, the scraper 12 slides along the cooling surface 3 while being in contact with the cooling surface 3, or the scraper 12 and the cooling surface 3 have a constant gap distance (for example, 1 to It can be installed so as to rotate around the cooling surface 3 without contacting the cooling surface 3 with a space of about 3 mm. In the former case, it is preferable that the cooling surface 3 be a smooth surface and that the rod-shaped scraper 12 be made of a resin (for example, MC nylon) having sufficient strength.

The scraper 12 is not limited to the rod-shaped structure described above, and may be any structure or material such as comb-shaped or brush-shaped as long as it can scrape off the powder layer adhering to the cooling surface 3. It may be one.

The scrapers 12 may be installed at four locations at 90 ° intervals in the circumferential direction of the first stirring blade 10 as shown in FIG. 2, or at three locations at 120 ° intervals. It is preferable to install a plurality of scrapers at equal angular intervals. Further, as shown in FIG. 1, the length of one scraper 12 does not necessarily have to cover the entire internal length (axial length) of the stirring tank 2.
It suffices if the scrapers 12 are installed so as to cover the entire inner length of the stirring tank 2, but at least 1
The scraper 12 of the book is installed so as to cover the entire internal length of the stirring tank 2.

Rotating shaft 9 to which such stirring blades 10 and 11 are fixed
Is, for example, pulleys 16, 17, belt 18, and motor 14.
It is configured to rotate at a predetermined speed by the driving means constituted by. The driving means is not limited to the one having the above-mentioned structure, and may have any structure suitable for rotating the rotary shaft 9.

The powders and granules that can be cooled or heated by the device of the present invention are not particularly limited, and may be edible powders such as wheat flour, starch and cereals, as well as cements, chemical powders and the like.

<Operation> The operation of the powder temperature adjusting device of the present invention will be described below.

When the powder temperature adjusting device 1 is used to cool powder such as wheat flour, the cooling liquid 15 is continuously supplied from the cooling liquid supply port 7 by the pump 27 or the like, and is circulated in the flow path 4. As a result, the cooling surface 3 of the stirring tank 2 is cooled and discharged from the cooling liquid discharge port 8.

On the other hand, the powder charged into the stirring tank 2 through the powder charging port 5 is efficiently stirred by the stirring blades 10 and 11 which are rotated by the driving means, and is brought into contact with the cooling surface 3 to be cooled.

The scraper 12 attached to the first stirring blade 10 moves along the immediate vicinity of the cooling surface 3 as the stirring blade rotates (the cooling surface 3
Move (while in contact with or with a certain gap distance),
Since the powder layer adhering to the cooling surface 3 is scraped off, heat exchange is smoothly carried out on the cooling surface 3, and a decrease in cooling efficiency is prevented.

As described above, the powder in the stirring tank 2 is efficiently cooled in a short time by simultaneously performing cooling and stirring.

The powder cooled to a predetermined temperature is taken out from the powder discharge port 6 and collected.

In addition, as a means for supplying the powder into the stirring tank 2 of the powder temperature adjusting apparatus 1 of the present invention, for example, an air transportation system as described below can be used.

As shown in FIG. 3, the compressed air discharged from the air supply pump 19 is dehumidified (dried) through the dehumidifying device 20, and is supplied into the air supply pipe 21 in the direction of the arrow in the figure. A hopper 22 containing powder 23 for cooling is connected in the middle of the air supply pipe 21, and the powder 23 in the hopper 22 is supplied into the air supply pipe 21 via a valve 25. . The powder supplied into the air supply pipe 21 is transported (for example, plug transport) in the air supply pipe 21 by the air flow sent under pressure, and the stirring tank 2 is supplied from the charging port 5.
It is thrown in.

Although the transport air and the powder enter the stirring tank 2 in a mixed state, only the transport air is discharged to the outside by the bag filter 24 installed on the upper portion of the stirring tank 2, and the powder is in the stirring tank 2. It is designed to be stored in.

The reason for dehumidifying (drying) the transportation air by the dehumidification device in such an air transportation system is as follows.

When the inside of the stirring tank 2 is cooled, if the humidity in the tank is high, dew condensation occurs on the cooling surface 3, so that the powder near the cooling surface 3 contains water and forms a block. Therefore, by using dehumidified air as the transportation air, the humidity in the stirring tank 2 is lowered, the dew condensation on the cooling surface 3 is prevented, and the above-mentioned adverse effects are prevented.

When the powder temperature adjusting device of the present invention is used to heat the powder, if a warming liquid such as warm water is circulated in the flow path 4 instead of the cooling liquid 15, the powder will operate in the same manner as described above. The body can be heated efficiently in a short time. When heating the powder, dehumidification in the stirring tank 2 is not necessary because there is no concern about dew condensation.

<Example> (Example 1 of the present invention) Using the thermic type 1 (standard processing amount 25 kg, actual capacity 120) which is a powder temperature adjusting device having the structure shown in FIG.
5 kg was cooled.

(Comparative Example 1) The same amount of wheat flour was cooled using the same powder temperature adjusting device as in Example 1 of the present invention except that no scraper was provided.

In order to compare the cooling efficiencies of the powder temperature control devices of Inventive Example 1 and Comparative Example 1 described above, the time required for the powder temperature of the flour to decrease from 30 ° C. to 20 ° C. was measured for each and the cooling required It was evaluated by time.

In the above measurement, three kinds of cold water having water temperatures of 0 ° C., 5 ° C. and 10 ° C. were used as the cooling liquid. The results are shown in Table 1.

Inventive Example 2 Using the same powder temperature adjusting device as in Inventive Example 1, flour 25
Kg was warmed.

(Comparative Example 2) The same amount of wheat flour was heated using the same powder temperature adjusting apparatus as in Example 2 of the present invention except that no scraper was provided.

In order to compare the heating efficiencies of the powder temperature control apparatuses of the present invention example 2 and comparative example 2, the time required for the flour temperature of the flour to rise from 10 ° C to 20 ° C was measured for each, and this heating It was evaluated by the time required for warming.

In the above measurement, two kinds of warm water having water temperatures of 40 ° C. and 50 ° C. were used as the heating liquid. The results are shown in Table 2.

As is clear from the results of Tables 1 and 2, the powder temperature adjusting apparatus of the present invention can efficiently cool or heat the powder in a short time.

<Effects of the Invention> According to the powder temperature adjusting apparatus of the present invention, while stirring and cooling (or heating) the powder at the same time, the temperature of the stirring tank is increased along with the vicinity of the heat conduction surface of the stirring tank. By providing a moving powder scraping member (scraper), it is possible to prevent the powder layer, which is an obstacle to heat exchange, from adhering to the heat conduction surface, thus efficiently cooling or heating the powder in a short time. can do.

[Brief description of drawings]

FIG. 1 is a partial vertical sectional view of a powder temperature adjusting device of the present invention. FIG. 2 is a partial cross-sectional view of the powder temperature adjusting device of the present invention. FIG. 3 is an explanatory view showing an example of means for supplying powder and means for supplying cooling liquid to the device of the present invention. Explanation of reference numerals 1 ... Powder temperature adjusting device, 2 ... Stirring tank, 3 ... Cooling surface, 4 ... Flow path, 5 ... Powder input port, 6 ... Powder discharge port, 7 ... Cooling Liquid supply port, 8 ... Coolant discharge port, 9 ... Rotating shaft, 10 ... First stirring blade, 11 ... Second stirring blade, 12 ... Scraper, 13, 13 ... Bearing, 14 ... Motor , 15 …… cooling liquid, 16,17 …… pulley, 18 …… belt, 19 …… air pump, 20 …… dehumidifier, 21 …… air pipe, 22 …… hopper, 23 …… powder, 24 …… Bag filter, 25 …… Valve, 26 …… Coolant circuit, 27 …… Pump, 28 …… Cooling device

Claims (2)

[Claims] 1. A charging port into which powder that has been pneumatically transported by pressurized dry air that has been dehumidified by a dehumidifying device is charged into the upper part, and only the transporting air from the powder that is charged in a mixed state together with the transporting air to the outside. Equipped with a bag filter for discharging and a powder discharge port for discharging powder adjusted to a predetermined temperature at the bottom, it is installed horizontally and cooled along the periphery of the tank so that a predetermined part of the inner wall surface of the tank serves as a heat transfer surface. A stirring tank in which a flow path for a liquid or a heating liquid is formed, and a horizontal rotation shaft that is rotatably supported at both end portions of the stirring tank, is rotatably housed in the stirring tank, and twists with respect to each other. At least two stirring blades whose directions are set to be opposite to each other, and at least one attached to the stirring blade so as to move along the vicinity of the heat conduction surface of the stirring tank and covering the entire inner length of the stirring tank. The powder scraping member, the powder temperature adjusting apparatus characterized by having a drive means for rotating the stirring blade. 2. The powder temperature adjusting device according to claim 1, wherein the powder scraping member is a rod-shaped scraper.