JPH0733871Y2 - Stir plate for stirring heat transfer device - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) This invention is an improvement of a stirring plate in an apparatus for stirring and treating powdery particles such as highly viscous sludge, ammonium sulfate, and iron oxide while applying thermal operation. Regarding

(Prior Art) As a stirring heat transfer device of this type, a generally used one is shown in FIGS. 5A and 5B. The horizontally long trough-shaped casing 1 extends from the bottom to the side circumference. It is surrounded by a jacket 4 for heat exchange, tilted so that the workpiece supply port 5a side is elevated through the support base 2, and inside the casing 1, a pair of left and right hollow rotary shafts 3 are arranged in the longitudinal direction. A plurality of agitating plates 6 which are erected in a penetrating state and have an arcuate hollow on the peripheral surface of each rotating shaft 3 as shown in FIGS. They are mounted and positioned so that the one on one rotating shaft lies between those on the other rotating shaft, and the insides of their stirring plates 6 project into the inside of each rotating shaft 3. The pair of distribution pipes 7 attached to each other connect them in the shaft. It is.

And during operation, steam, heating oil,
Heat medium such as hot water and cold water is used for jacket inlet 4a (4b is outlet)
From inside the pair of rotating shafts 3 and each stirring plate 6
It is also fed through the inlet pipe 3b (3c is an outlet) connected to the rotary joint 3a at one end of the casing, and each rotary shaft 3 is slowly rotated inwardly by a sprocket 8a and a gear 8b that interlock with the motor. Then, the object to be treated is supplied into the casing 1 from the supply port 5a, and the overflow height of the weir plate 9 provided on the side of the outlet 5b is adjusted to adjust the residence time, and the objects to be treated face each other. While stirring by stirring with a rotating stirring plate 6 to loosen the lumps, heat is exchanged by the heat medium sent to the jacket 4, the rotating shaft 3 and each stirring plate 6 to dry the object to be treated as necessary while The steam generated in the air is entrained in the air taken in from the air inlet a ₁ and expelled from the outlet a ₂ .

(Problems to be solved by the invention) By the way, since the stirring plate used in the above-mentioned device is simply made of a metal plate in a hollow shape, it is not necessary to remove sewage sludge with reduced water content, slaked lime, iron oxide, etc. In the case of treating highly abrasive substances, the plate thickness of the stirrer plate, especially the plate thickness of the outer edge part, decreases with the lapse of operating time, and finally holes are formed in the stirrer plate, and the heat medium leaks from there. Will end up.

For example, when drying sewage sludge to a water content of 10% or less,
After about 7,000 hours of operation, the above condition is reached.

In such a situation, it is the actual situation that the rotating shaft with many stirring plates that are still usable for the machine life is usually replaced, and such a method requires a long downtime, large-scale construction, and a large amount of work. It costs a lot of money and is very uneconomical.

Therefore, the present invention provides a stirring plate that does not cause perforation or leakage of a heat medium even if it is used for a long time in the above-mentioned device, has good heat transfer, and can easily replace only the easily worn part. The purpose is to do.

(Means for Solving the Problem) Based on the above-mentioned object, the present invention has a plurality of arc-shaped objects fixed to the circumferential surface of a hollow rotary shaft in the circumferential direction and the axial direction to heat a powdery or granular object. As a stirring plate for the device that performs stirring processing under the exchange operation, each stirring plate is made of corrosion-resistant and wear-resistant metal, and a hollow box-shaped that connects the arc-shaped halves on the inner side in the radial direction to the inside of the rotating shaft And the outer arcuate half is formed into a solid body, and each solid outer arcuate half is formed by a substrate integrated with the hollow box-shaped inner arcuate half and an exchange plate forming its outer layer part. The replacement plates are detachably attached to the board.

(Embodiment) FIGS. 1A and 1B show an example of a heat exchange stirring plate according to the present invention. The stirring plate 13 is made of a metal material having corrosion resistance and wear resistance, such as stainless steel, and has a front surface. When viewed from the above, the annular body is formed into a plurality of divided arcs, and the arcuate half 13a on the inner side in the radial direction is formed into a hollow box-like shape, while the arcuate half 13b that is integral outside thereof is formed into a solid body. Cage,
A plurality of such stirring plates 13 are provided inside the arcuate half 13a.
The inner peripheral edge of the rotary shaft is brought into contact with the peripheral surface of the hollow rotary shaft 11,
11 are fixed to each other at predetermined intervals in the circumferential direction and the axial direction by means such as welding.

And, the hollow box-shaped inner arc-shaped half 13a of each stirring plate 13,
The rotary shaft 1 is located at the position where it hits both sides of the arc half 13a.
The circulation pipes 12 are attached to the peripheral wall of the pipe 1 so as to project inward, and are communicated with each other in the shaft.
When the above-mentioned heat medium is supplied to the inner arcuate half portion 13a through 12 the solid outer arcuate half portion 13b serves as a heat transfer fin.

The solid outer arc-shaped radius 13b of each stirring plate 13 is formed by a substrate 13b ₁ having a T-shaped cross section and two exchange plates 13b ₂ which are integral with the hollow inner arc-shaped half 13a. ₂ is substrate 13
It is detachably attached to the front and back sides of b ₁ with screw members. Further, a scraping plate 15 is provided on each of the outer arc-shaped half portions 13b of each stirring plate 13 at the rear edge in the rotation direction. However, this does not matter.

Then, a pair of hollow rotary shafts 11 having a plurality of the stirring plates 13 mounted in the circumferential direction and the axial direction are penetrated into the trough-shaped casing 10 as shown in FIGS. The stirring plate 13 is installed so as to be positioned between the stirring plates 13 on the other shaft, and when the apparatus is in operation, the pair of rotating shafts 11 are rotated inward relative to each other as described above, and the casing jacket 14 is heated. At the same time that the medium such as steam is sent, it is sent into each rotary shaft 11 through the inlet pipe at the shaft end.

The steam sent to each rotating shaft 11 enters the inner arcuate half 13a of each stirring plate 13 through a large number of distribution pipes 12 provided on the shaft (in this case, the pipe whose position is raised by the rotation of the shaft is the inlet. And the lowered pipe becomes drain), and each stirring plate 13 is heated.

On the other hand, each stirring plate 13 scrapes and stirs the object to be processed supplied into the casing 10 to perform heat exchange with the object to be processed while loosening the mass, thereby reducing the water content of the object to be processed.
In this case, since the outer arc half 13b of each stirring plate 13 in which the peripheral speed during rotation is large and the friction with the object to be treated becomes remarkable, the object to be processed is dried because the outer arc-shaped half 13b is formed of a solid body of wear-resistant metal. Even if the friction increases and the friction increases, the outer peripheral portion of the stirring plate is not perforated as before, and the heat medium does not leak.

By the way, the outer arc half of the stirring plate 13
When the exchange plates 13b _{2 on} both sides of 13b are worn, only the worn exchange plates 13b ₂ are removed from the substrate 13b ₁ and replaced with new ones.

The operation of drying the sewage sludge to 10% or less by the device equipped with the stirring plate 13 was continuously tried for about 1 year.
No abnormalities were found that would render it unusable. Also,
The heat transfer fin efficiency due to the solid outer arc-shaped half 13b was about 80% of that when the part was hollow.

FIGS. 3A and 3B show that the substrate 13b ₁ integrated with the hollow inner arc-shaped half portion 13a is formed in a convex shape or a concave shape in cross section, and the exchange plate 13b ₂ is made as one thick wall. 7 shows a modified example in which the edge portion is attached to the substrate 13b ₁ by a screw member so as to be exchangeable.

In addition, in FIGS. 4A and 4B, the pair of upper and lower stirring plates 13 are inclined so as to present one inclined surface with respect to the rotation shaft 11 or the vertical direction without attaching the stirring plate 13 to the rotation shaft 11. This is an example in which the stirring plate 13 is tilted with respect to the rotation shaft 11 and is attached so as to be axially displaced from each other. In this way, the rotation of the rotation shaft 11 causes the stirring plate 13 to swing left and right. By doing so, the effect of scraping off the tacky object to be processed is improved.

(Effects of the Invention) As described above, according to the present invention, each stirring plate has corrosion resistance and abrasion resistance as an arc-shaped stirring plate of a device for stirring and treating powdery particles having remarkable abrasion property under heat exchange operation. It is made of metal and its inner half in the radial direction is formed in the shape of a hollow box that communicates with the inside of the rotating shaft, while the outer half of the arc that follows is formed in a solid body, and each solid outer arc half is formed. The parts are formed by a substrate integrated with a hollow box-shaped inner arcuate half part and exchange plates that form the outer layer part, and these exchange plates are detachably attached to the respective substrates, so that this part is attached to the outer peripheral part that is easily worn. As in the above, there is no perforation as easily as before, there is no fear of leakage of heat medium, and it is possible to use it for a long period of time while maintaining a high heat transfer effect. Also, both sides of the outer arc half are worn. When doing, without replacing the entire rotary shaft as before, Only the worn parts can be easily replaced at any time, and the cost and time for the replacement work can be significantly reduced.

[Brief description of drawings]

FIG. 1A is a partially cutaway front view showing a state in which an embodiment of the present invention is attached to a rotary shaft. 2B is a sectional view taken along the line AA of FIG. FIG. 2B is a partial side view showing a usage state. The same figure B is also a partial plan view. 3A and 3B are cut-away side views of different embodiments. Fig. 4 (a) and (b) are side views when the stirring plate is attached while being inclined with respect to the rotating shaft. FIG. 5A is a side view in which a part of the stirring heat transfer device is removed. The same figure is a cross-sectional view thereof. FIG. 6A is a sectional side view of a conventional stirring plate attached to a rotary shaft. The same figure is also a cutaway front view. In the figure 1,10 …… Casing, 3,11 …… Rotating shaft 7,12 …… Distribution pipe, 6,13 …… Stirring plate 13a …… Inner arc half, 13b …… Outer arc half 13b ₁ …… Substrate, 13b ₂ …… Exchange plate 4,14 …… Jacket

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Norichika Tanaka 2-17-15 Tsukushima, Chuo-ku, Tokyo Within Tsukishima Machinery Co., Ltd. (72) Yasuhiko Kamijo 2-17-15 Tsukushima, Tsukushima, Chuo-ku, Tokyo Machinery Co., Ltd. (56) Reference JP-A-59-87025 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. A stir plate of an apparatus, which is arcuately fixed on the peripheral surface of a hollow rotary shaft 11 in a circumferential direction and an axial direction, and which stirs a powdery or granular material to be processed under a heat exchange operation. In the above, each stirring plate 13 is made of a metal having corrosion resistance and abrasion resistance, and the arc-shaped half portions 13a on the inner side in the radial direction are formed into a hollow box shape communicating with the rotary shaft 11 and the arc-shaped half portions on the outer side thereof. Forming the portion 13b into a solid body, each solid outer arcuate half 13b
Is formed by a substrate 13b ₁ that is integral with the hollow box-shaped inner arcuate half 13a and an exchange plate 13b ₂ that forms an outer layer portion thereof.
An agitating plate for an agitating heat transfer device, wherein 13b ₂ is detachably attached to a substrate 13b ₁ .