JP2609578B2 - Stirring device for powders - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention is used in the field of agitation technology of powders or liquids, preferably powders (hereinafter referred to as "powders etc."), In particular, the present invention relates to a stirring device such as a granular material having cooling means for stirring blades.

(Prior art and problems) Many of the powder and granular materials such as resin pellets need to be stirred at a predetermined temperature during blending.

Therefore, as shown in FIG. 3 of the related art, a stirrer 50 having a plurality of blades 51 extending in a radial direction for stirring is provided.
A cooling space 53 is formed so as to cover almost the entire surface of the stirring vessel 52, cooling water is supplied from one end of the cooling space 53, and the cooling water after the temperature rise is drained from the other end to generate stirring heat through the stirring vessel. Absorbed.

However, in the above-described apparatus, after the powder or the like once absorbs the heat of stirring by the stirring, the powder or the like is cooled by the stirring when the powder or the like comes near the stirring vessel. That is, the temperature of the powder or the like once rises and is difficult to cool, and is not a fundamental solution. Therefore, for example,
As disclosed in US Pat. No. 149929, attempts have been made to cool a rotating body having a stirring blade to control the heat of stirring around the stirring blade with the highest stirring. This device has a hollow rotary shaft 61 as shown in FIG.
An annular space 63 extending in the axial direction between the two tubes 62
A hollow disk-shaped member 64 having a triangular cross section is attached to the rotating shaft 61 to allow the space 65 in the disk-shaped member 64 to communicate with the annular space, and the tubular body 62 and the disk-shaped member 64 are formed. And an outer peripheral portion thereof are connected by a partition plate 67 partially having an opening 66. The stirring blade 68 is attached to the outer peripheral edge of the disk-shaped member 64.

In the device as described above, the cooling water flowing into the annular space 63 flows into the plurality of disc-shaped members 64 one after another, so that the disc-shaped members 64 are effectively cooled. However, since the cooling water does not enter the stirring blade 68 itself, the stirring blade is cooled by the heat transfer via the disk-shaped member, and the cooling effect is not much improved. Furthermore, since the above-mentioned disc-shaped member forms an annular space which covers the entire circumference as shown in the figure, it can be manufactured under the above-described configuration. It is extremely difficult to fabricate to apply for cooling the extending blades.

(Means and Actions for Solving the Problems) The present invention solves the problems of the conventional apparatus as described above, and even if the stirring blades are of a type extending in the radial direction, the blades are internally inserted. It is an object of the present invention to provide a stirrer, such as a powder or granule, which can be cooled from the beginning and has a simple structure therefor.

The present invention provides, in order to achieve the above object, a rotating shaft supported by a stirring vessel having a plurality of stirring blades extending in a radial direction at a plurality of positions in an axial direction. An axially extending hollow hole which is open and closed at the other end is formed, and a pair of holes which communicate with the hollow hole and are closely adjacent in the axial direction penetrate radially at the blade mounting position. An annular space is formed in the hollow hole of the rotating shaft, which is spaced apart from the closed wall surface at the other end in the axial direction and extends axially between the inner peripheral wall surface of the hollow hole in the radial direction. The exhaust pipe is inserted so as to protrude from the one end, and the annular space is formed in a plurality in the axial direction by an annular seal member attached to the outer periphery of the exhaust pipe so as to be located between the pair of openings. The blades are open only at the base and extend radially inward. Is formed and a partition plate extending in the radial direction at a position between the paired openings in the internal space and leaving a space between the tip and the inner wall surface of the blade to partition the internal space into two. A sealing member for sealing the annular space in the axial direction is provided on one end side of the rotating shaft, and a coolant supply pipe for supplying a coolant to the annular space is connected to the sealing member. Composed of

According to the present invention having such a configuration, a cooling liquid such as cooling water is supplied from the cooling liquid supply pipe to one end of the annular space. The cooling liquid flows toward the other end in the annular space, but is prevented from flowing toward the other end by the seal member at the first blade position, and out of a pair of openings provided immediately before the seal member. It flows into the internal space on the near side of the partition plate of the blade via the opening on the near side (one end side). After reaching the blade tip direction, the cooling liquid bends in the space at the tip of the partition plate, and flows toward the base of the blade in the internal space on the opposite side of the partition plate. Thereafter, the coolant returns to the annular space again through the front side (tip side) of the pair of openings, and flows into the next blade.

The cooling water that has passed through the blades sequentially flows into the exhaust pipe at the other end of the annular space, and is then discharged out of the apparatus at one end.

The temperature of the coolant that rises as it sequentially passes through the plurality of blades, and is then discharged, is cooled by the heat exchange device and is brought back to the coolant supply pipe.

In the present invention, the exhaust pipe may be non-rotating,
It is also possible to adopt a type that rotates with the rotation shaft.

For example, in the case of a non-rotating type, in order to control the wear of the seal member as much as possible, the seal member attached to the outer peripheral surface of the exhaust pipe is gently brought into contact with the circumferential surface of the hollow hole of the rotating shaft, and in some cases, a slight A gap may be provided. In such a case, the wear is very low, and even if there is a gap, the seal member shows sufficient resistance to axial flow and has no effect on the flow to the aperture.

Next, in the case of the rotary type, the seal member is attached so as to be firmly fitted to the inner peripheral surface of the hollow hole of the rotary shaft, and a bearing is interposed between the exhaust pipe and the seal member at one end. I just need. By doing so, the rotatably supported exhaust pipe receives torque from the rotating shaft via the seal member and rotates with the rotating shaft.

(Embodiment) Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
Description will be given based on the drawings.

In FIG. 1, reference numeral 1 denotes a hollow rotary shaft which is supported by a bearing portion S of a stirring vessel (not shown) and receives rotational driving.

Stirring blades 2 extending in the radial direction at a plurality of positions in the axial direction are attached to the rotating shaft 1 by welding or the like at their bases. As shown in FIG. 2, the blades 2 are inclined with respect to the axis for the purpose of improving the stirring performance.

The blade 2 has an internal space 3 opening at its base, and the internal space 3 extends radially outward from the base to leave a space between the blade and the inner wall surface at the tip end by a partition plate 4. , Internal space 3A, 3B before and after in the axial direction except for the above-mentioned tip
It is divided into.

On the other hand, the rotary shaft 1 has a pair of apertures 5 at positions close to each other in the axial direction (5A and 5B near the front and rear in the axial direction).
Are formed, and the internal spaces 3A and 3B before and after the partition plate of the blade are respectively communicated with the hollow holes of the rotating shaft. The hollow hole of the rotating shaft 1 is axially opened at one end 1A and closed at the other end 1B.

In the hollow hole of the rotating shaft 1, an exhaust pipe 6 is provided from one end 1A side.
Is inserted. The exhaust pipe 6 is provided inside the hollow hole, is spaced apart from the closed wall 1B 'at the other end in the axial direction, and forms an annular space 7 between the inner peripheral wall surface of the hollow hole in the radial direction. Are arranged as follows.

An annular seal member 8 (8A, 8B...) Is provided on the outer peripheral surface of the exhaust pipe 6 so as to be located between two pairs of openings 5 (5A, 5B) formed in the rotary shaft 1. The annular space 7 is attached so as to be divided into a plurality in the axial direction. In the case of the present embodiment, since the exhaust pipe is non-rotating, the seal member 8 (8A, 8B...) Rotates to minimize wear due to the relative rotation between the exhaust pipe 6 and the rotating shaft 1. The inner peripheral surface of the shaft is lightly touched or a slight gap is formed. Thus, the sealing member 8 (8A, 8B
…), The annular space 7 is axially divided into sections 7 of the annular space.
A, 7B... 7Z are divided into a plurality of sections.

A joint 10 having a packing 9 is attached to one end 1A of the rotating shaft 1 as described above, and a sealing member 11 is inserted into the joint 10 so that the packing 9 is pressed. The sealing members 11 are loosely fitted to each other so as to allow relative rotation with respect to the joint 10. The sealing member 11 supports one end of the exhaust pipe 6 to seal the annular space and is positioned in the axial direction. A coolant supply pipe 12 is connected to the sealing member 11 so as to supply coolant to one end of the annular space 7.

Further, the sealing member 11 has a hole 11A communicating with the inside of the exhaust pipe 6 and a pipe 13 connected thereto. The drain pipe 13 allows the coolant to return to the coolant supply pipe 12 via a heat exchange device (not shown).

In the apparatus of the present embodiment as described above, the rotating shaft of the stirring device and the blades attached thereto are cooled as follows.

First, when a cooling liquid such as cooling water is supplied from a cooling liquid supply pipe, the cooling liquid passes through the inner space of the sealing member 11 and the joint 10 and then flows through the first space of the annular space 7 formed in the rotary shaft 1. After flowing into the section 7A of the annular space, the flow in the axial direction is prevented by the first sealing member 8A, so that it turns into the blade 2 through the opening 5A.

The coolant that has flowed into the blade 2 flows radially outward from the base in the front (front) internal space 3A in the axial direction with the partition plate 4 as a boundary, and the inner wall surface of the blade and the partition plate 4 at the tip of the blade. In the leading end space, which is a space between the inner space 3B and the inner space 3B, the space is bent toward the other internal space 3B and reaches the opening 5B. Thus, the blades 2 are cooled from the inside.

Section 7B of the second annular space of the annular space 7 through the opening 5B
The entered coolant flows in the axial direction and cools the next blade in the same manner as described above.

As described above, the cooling liquid that has sequentially cooled the plurality of blades 2 and raised in temperature reaches the other end of the annular space 7, changes its direction therefrom, flows into the exhaust pipe 6, and from one end thereof. It is introduced into the pipe 13 through the hole 11A of the sealing member 11.

The heated cooling water is brought to a heat exchanger (not shown) by a pipe 13, cooled there, and then returned to the coolant supply pipe 12 again.

In addition, it is also possible to switch the cooling liquid such as the cooling water by the above-mentioned cooling liquid supply pipe to the heating liquid such as the hot water and use the same to shorten the time when the temperature of the granular material or the like is raised. Further, the apparatus of the present embodiment operates as described above, but at the time of its manufacture and assembly, the blade is fixed to the tapered groove-shaped member by welding or the like, and then fixing the plate covering the rear groove edge. It is only necessary to secure the seal member at a predetermined position of the exhaust pipe in advance and insert the exhaust pipe into the hollow hole of the rotating shaft.

In this embodiment, the case where the exhaust pipe is non-rotating is shown, but the seal member is set so as to fit tightly with the circumferential surface of the hollow hole of the rotating shaft, and a bearing is provided between the sealing member and the exhaust pipe. If it is interposed, the exhaust pipe rotatably supported by the bearing receives the driving torque from the rotating shaft and rotates together with the rotating shaft, so that there is no worry about wear.

(Effect of the Invention) According to the present invention as described above, not only the rotating shaft but also the blade itself, which has been considered difficult, can be cooled.
Even in the portion where stirring is most intense, the granules and the like are sufficiently cooled, and the structure is extremely simple, so that an economic effect in terms of production and maintenance is brought about.

[Brief description of the drawings]

1 is a longitudinal sectional view of an apparatus according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIGS. 3 (A) and 3 (B) are perpendicular to the axis of the conventional apparatus. And FIG. 4 is a partial longitudinal sectional view of another conventional apparatus. DESCRIPTION OF SYMBOLS 1 ... Rotating shaft 1A ... One end 1B ... Other end 1B '... Closing wall surface 2 ... Blade 3 ... Internal space of blade 4 ... Partition plate 5 (5A, 5B) ... Opening 6 ... … Exhaust pipe 7 (7A, 7B,…, 7Z)… Annular space 8 (8A, 8B,…)… Seal member 11… Seal member 12… Coolant supply pipe

Claims (3)

(57) [Claims] 1. A rotating shaft supported by a stirring vessel having stirring blades extending in a radial direction at a plurality of positions in an axial direction, wherein the rotating shaft is opened at one end and closed at the other end. A hollow hole extending in the axial direction is formed, and a pair of holes that communicate with the hollow hole and are adjacent to each other in the axial direction are drilled in the radial direction at the blade mounting position, and In the hollow hole, an exhaust pipe forming an annular space extending in the axial direction between the closed wall surface at the other end in the axial direction and the inner peripheral wall surface of the hollow hole in the radial direction is formed from the one end. The annular space is axially partitioned by an annular seal member attached to the outer circumference of the exhaust pipe so as to be located between the pair of openings, and the blade is An inner space that is opened only at the base and extends in the radial direction is formed and the inner space is formed. A partition plate extending in the radial direction at a position between the pair of openings and leaving a space between the tip and the inner wall surface of the blade to partition the internal space into two, A sealing member for sealing the annular space in the axial direction is provided on one end side, and a cooling liquid supply pipe for supplying a cooling liquid into the annular space is connected thereto. Stirring device such as body. 2. A stirrer according to claim 1, wherein the seal member is loosely arranged with respect to the inner peripheral surface of the rotating shaft, and the discharge pipe is non-rotating. . A sealing member disposed between the inner peripheral surface of the rotary shaft and an outer peripheral surface of the exhaust pipe, and a rotation of the exhaust pipe between the sealing member and the exhaust pipe at one end of the rotary shaft; Claim (1), characterized in that a bearing for allowing the pressure is interposed.
Stirring equipment value for powders and granules described in the item.