JPH0817932B2 - Screw type heating and cooling device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an adhesive powder,
The present invention relates to a screw type heating / cooling device that heats and cools materials such as granules and fluids.

[0002]

2. Description of the Related Art As a conventional heating / cooling device of this type, for example, there is one described in Japanese Patent Publication No. 55-43887.

[0003]

By the way, in this conventional screw type heating / cooling device, two screw blades are completely meshed with each other over substantially the entire length of the screw shaft, and the raw material is fed at the groove portion (valley portion) of the screw blade. Therefore, the transfer of the raw material was too fast, and it was difficult to secure the residence time required for heating and cooling. In addition, since the raw material fixed to the inner wall surface of the casing and the screw blades come into contact with the entire outer peripheral surface, the entire outer peripheral surface of the screw blades wears, the repair area at the time of wear increases, and the repair cost increases. Is not easy, and moreover, to prevent wear, the entire outer peripheral surface of the screw blade is sprayed with ceramics,
It was necessary to protect it with hardfacing. Further, the area of the minimum gap between the outer peripheral surface of the screw blade and the inner wall surface of the casing becomes too large, the raw material may not be scraped off, and it may be pressed against the inner wall surface and become stuck, and the frictional force also becomes large and the screw shaft increases. There has been a problem that a large torque is required to drive and rotate the.

Therefore, the present invention solves the above-mentioned conventional problems, can sufficiently secure the residence time of the raw material, is easy to scrape the raw material, and has a low wear countermeasure cost and repair. An object of the present invention is to provide a screw type heating / cooling device which is easy and requires a small driving torque.

[0005]

In order to achieve the above object, the present invention provides a screw type heating and cooling apparatus as described above, wherein the outer peripheral surface of the hollow screw blade is a flat surface wide in the axial direction of the hollow screw shaft. A hollow tangential chordal notch that is formed and that allows the raw material to adhere to and flow into the lower part of the hollow screw blade when facing the hollow screw shaft of the other hollow screw blade at some point on the outer peripheral surface. The scraper is provided at a depth that does not reach the screw shaft, and a scraper projection is provided on the outer peripheral surface of the hollow screw blade behind the cutout portion in the rotation direction.

[0006]

With the above-described structure, the adhesive raw material that is supplied into the casing and rises above the hollow screw shaft and the hollow screw blades is such that the notch of one screw blade is the other screw blade. When it faces the hollow screw shaft of No. 2, it flows into the lower part of the screw blade while adhering to the notch. As a result, the temporary transfer of the raw material is stopped. Then, the raw material whose transfer is stopped is not transferred and is lifted with the rotation of the screw blade while being attached to the notch. The raw material lifted up by the notch portion is rotated about once by the clew blade, and when the notch portion again faces the hollow screw shaft of the other screw blade, the raw material transferred from the rear side is the notched portion. By adhering to the portion, it is separated from the cutout portion, replaces this raw material, merges with the raw material being transferred, and is further forwarded together with these raw materials. Further, the raw material pressed against the inner wall surface of the casing is scraped off by the projections, and the friction of the raw material with respect to the outer peripheral surface of the screw blade is significantly reduced as compared with the scraping on the entire outer peripheral surface without the projections.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the present invention along line B in FIG.
2 is a vertical sectional front view taken along line -B, and FIG. 2 is a vertical sectional side view taken along line AA in FIG. In both figures, 1 is jacket 2 on the side
Is a double U-trough type casing in which a pair of hollow screw shafts 3 and 4 rotating in opposite directions are horizontally arranged in parallel inside the casing 1. These hollow screw shafts 3 and 4 are supported by a bearing member (not shown) outside the casing 1, and are rotationally driven by a driving member such as a motor (not shown). Hollow screw blades 5 and 6 are arranged on the hollow screw shafts 3 and 4 so as to mesh with each other and communicate with the insides of the hollow screw shafts 3 and 4. The outer peripheral surfaces of the hollow screw blades 5 and 6 are shown in FIG.
As shown in FIG. 2, the hollow screw shafts 3 and 4 are formed on a flat surface that is wide in the axial direction, and tangential chordal notches 7 and 8 are provided at the outer peripheral surfaces of the hollow screw shafts 3 and 4. The depth is less than 4. In this example, the notches 7 and 8 are provided at every 145 °, but the notches are not necessarily limited to this, and may be provided at any angle such as 120 ° or 180 °. On the outer peripheral surface of the hollow screw blades 5, 6 behind the cutouts 7, 8 in the direction of rotation, a projection 1 for a scraper for scraping off the raw material adhering to the inner wall surface of the casing 1
0 and 11 are provided by hardfacing.

In the hollow screw shafts 3 and 4, FIG.
A heating medium such as steam or warm water or a cooling medium is supplied as shown in FIG. 2, but a part of this supply medium passes from one end (the right end in the figure) of the hollow screw shafts 3 and 4 through a communication hole (not shown). It flows into the hollow screw blades 5 and 6 and further from the inside of the hollow screw blades 5 and 6 to another end portion of the hollow screw shafts 3 and 4 through another communication hole (not shown). A heating medium or a cooling medium is likewise supplied to the jacket 2. In FIG. 2, 13 is the inflow port, and 14 is the outflow port. A steam chamber 15 is formed inside the casing 1 above the hollow screw blades 5 and 6. In FIG. 1, 16 is a raw material supply port provided on the top wall of the casing 1, 17 is the same discharge port, 18 is a ventilation port, and 19 is an exhaust port.

The raw material supplied from the raw material supply port 16 is sent by the hollow screw blades 5 and 6 from the upstream part to the downstream part (in this example, from the left direction to the right direction) in the phase traveling direction, during which the raw material is supplied to the jacket 2. And is heated by, for example, a heating medium flowing in the hollow screw shafts 3, 4 and the hollow screw blades 5, 6. The vaporized gas vaporized by this heating is made into high humidity air by the ventilation air sent from the ventilation port 18 in the vapor chamber 15, and is exhausted from the exhaust port 19.

During the transfer of the raw material, the adhesive raw material 20 which is raised above the screw shafts 3 and 4 and the hollow screw blades 5 and 6 has a cutout portion 7 of one screw blade 5 as shown in FIG. When facing the screw shaft 4 of the other screw blade 6, the notch 7
While adhering to, it flows under the screw blades 5, 6. This stops the temporary transfer of the raw material 20 (see FIG. 4).
(A), (B)). And the raw material 20 for which this transfer has stopped
Is not transferred and is lifted as the screw blades 5 rotate while being attached to the notch 7. And
The raw material 20 lifted up by the notch portion 7 is cut once when the clew blade 5 makes one revolution and the notch portion 7 again faces the screw shaft 4 of the other screw blade 6, the raw material 20a transferred from the rear is cut. By adhering to the cutout portion 7, the raw material 20 is peeled off from the cutout portion 7.
a and merges with the raw material 20a being transferred, and is further forwarded together with these raw materials 20a (see FIG. 4).
(C), (D)). That is, according to this, the swelling of the raw material 20 at the upper part of the screw blades 5 and 6 and the retention phenomenon can be eliminated, and the retention time of the raw material 20 can be sufficiently taken, so that the raw material 20 is quickly transferred without staying at all. This phenomenon can be prevented.

Further, as shown in FIG. 5, the raw material 20 pressed against the inner wall surface of the casing 1 is scraped off by the projections 10 and 11, and the friction of the raw material 20 against the outer peripheral surfaces of the screw blades 5 and 6 is caused by the projections 10 and 11. It is remarkably reduced compared to the one scratched on the entire outer peripheral surface. Therefore, the only measure against wear is protrusion 1.
It is only necessary to apply it to Nos. 0 and 11, and it is not necessary to protect the entire outer peripheral surfaces of the screw blades 5 and 6 with ceramic spraying, hardfacing, or the like.

Although the heating of the raw material by the heating medium has been described in the above embodiment, the same can be said for the cooling of the raw material. Further, the shapes of the cutouts 7 and 8 and the projections 10 and 11 described in the embodiments are merely examples, and the shapes are not limited to these shapes.

[0013]

According to the first aspect of the present invention, the hollow screw shaft and the raw material having adhesiveness that rises above the hollow screw blades are formed in the above-described structure, and the notch portion of one screw blade is the screw of the other screw. When it comes to face the hollow screw shaft of the blade, it can flow into the lower part of the screw blade while adhering to the notch and stop the temporary transfer of the raw material. The residence time can be sufficiently secured, and the raw material can be heated or cooled well. In addition, scraping the raw material adhered to the inner wall surface of the casing with the scraper protrusions does not generate the force to press the raw material against the wall surface as in the case of scraping with the entire outer circumference of the screw blades, so the raw material can be easily scraped. . Moreover, since it is only necessary to take measures against wear on the protrusions, the cost is low and the repair is easy. Further, the clearance between the outer peripheral surface of the screw blade other than the protrusion for the scraper and the inner wall surface of the casing is increased, the friction amount is reduced, and the driving torque of the screw shaft can be reduced. .

[Brief description of drawings]

FIG. 1 is a vertical sectional front view taken along the line BB of FIG. 2 showing an embodiment of the present invention.

2 is a vertical cross-sectional side view taken along the line AA of FIG.

FIG. 3 is a sectional view of a hollow screw shaft and a hollow screw blade.

4 (A) to (D) are explanatory views of the operation for explaining the retention phenomenon of the raw material.

FIG. 5 is an operation explanatory view for explaining scraping of the raw material by the protrusion.

[Explanation of symbols]

 1 Casing 2 Jacket 3,4 Screw shaft 5,6 Screw blade 7,8 Notch 10,11 Protrusion 15 Evaporation chamber

Claims (1)

[Claims] 1. A hollow screw in which a pair of hollow screw shafts rotating in mutually opposite directions are horizontally arranged in parallel inside a casing, and the adhesive raw material supplied into the casing is fed onto these hollow screw shafts. In the screw type heating / cooling device in which the blades are meshed with each other and the inside of which is arranged to communicate with the inside of the hollow screw shaft, and the inside of the casing above these hollow screw blades is formed as a steam chamber, The outer peripheral surface of the screw blade is formed as a wide flat surface in the axial direction of the hollow screw shaft, and when the outer peripheral surface is opposed to the hollow screw shaft of the other hollow screw blade, the raw material is attached to form a hollow Hollow tangential string lunar notch that flows into the bottom of the screw blade A screw-type heating / cooling device, which is provided at a depth that does not reach the screw shaft, and a projection for a scraper is provided on the outer peripheral surface of the hollow screw blade behind the cutout portion in the rotation direction.