JPS6219326B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a stirring heat transfer device suitable for heating or cooling substances such as powder or highly sticky sludge while stirring and mixing them.

BACKGROUND OF THE INVENTION Conventionally, stirring and transfer devices are known that include rotating shafts spaced parallel to each other within a substantially horizontal casing and stirring plates installed on these rotating shafts. Also,
A device that heats or cools sludge, powder, etc. while stirring and transporting such rotating and stirring plates, which are hollow and communicate with each other, and a heat exchange medium is passed through them. is also publicly known. Such a heat exchange device can perform heat exchange while transferring, has high thermal efficiency,
It has a large heat transfer area per unit volume, it provides a uniform stirring effect so it can heat or cool the substance uniformly, it rotates at a low speed, so it requires less power and has very little wear on the rotor blades. Since it has many advantages such as a small amount of exhaust gas when used as a drying device, it is used in a wide range of fields as an agitation type indirect heat exchange device.

However, the biggest drawback of this type of apparatus is that depending on the substance to be treated, the adhesion phenomenon is significant, leading to a decrease in performance and various troubles. This adhesion phenomenon especially develops and becomes more severe from the back side of the rotating stirring plate. If adhesion occurs, the heat transfer rate will be reduced in the case of heat exchange, and the stirring and transfer effects will also be reduced. In extreme cases, the rotating shaft and the stirring plate may become wrapped in the substance to be treated and become round rod-shaped, making them inoperable. Conventionally, there have been two methods to deal with such problems: One of them is to provide a fixed scraping arm between stirring plates arranged perpendicular to the axis centerline. Generally, the arm is attached to the inner wall surface of the casing or the upper cover. However, with this method, as the scraped material to be treated accumulates on the arm, the movement of the material near the arm slows down, which tends to create a space, and the contact area between the material between the stirring plates and the arm. is always the same, so the scraping effect is partial, and the material in the area that does not come into contact with the arm is not affected by the scraping action, the arm acts as a resistance to the backward flow of the material to be processed, and the stirring plate There are still many problems such as poor transfer ability because it is perpendicular to the axis. Another method is to install special wedge-shaped wings perpendicular to the axis centerline. The blades of one shaft are installed in such a manner that the wedge-shaped blades of the other shaft face each other. However, even in this method, there are problems in that the material between the blades on one shaft and the contact area between the blades on the other shaft are the same, resulting in poor stirring action and poor heat transfer ability of the device itself.

Therefore, in view of the above points, there is provided a stirring transfer device of the above type with a simple structure, which can effectively prevent the substance to be treated from adhering to the inner wall surface of the casing and between the stirring plates, and can also perform heat exchange. However, when the stirring and transfer device is used as a large heating device, the length of one stirring plate 11 is determined when the inclined stirring plates 11 spaced apart from the shaft 6 have a constant angle of inclination as shown in FIG. The problem was that the surface area of the plate per unit volume decreased in inverse proportion to the major axis of the plate.

In order to solve the above-mentioned problems, the present invention has a plurality of hollow fan-shaped stirring plates for passing the heat exchange medium, and one heat transfer plate is attached to the corresponding shaft or the longitudinal axis of the hollow shaft. The stirring plates on one axis are arranged at an angle with respect to a plane perpendicular to the direction axis, and the other stirring plate is arranged at approximately the same angle of inclination and approximately between one stirring plate, and each stirring plate on one axis Adjacent stirring plates are spaced so that they partially fit into each other, and when the two shafts rotate together, the stirring plates spaced so that they fit between the two shafts periodically increase and decrease. As a result, the heat transfer surface area of the plate per unit volume can be almost doubled, and when used in a heating dryer, the length of the shaft can be roughly halved, making it possible to reduce the heat transfer surface area of the plate per unit volume. It is an object of the present invention to provide a stirring heat transfer device whose manufacturing cost can be significantly reduced.

The present invention will be described below with reference to embodiments shown in the drawings. First, referring to FIGS. 1 to 3, the heat exchange type stirring heat transfer device has a casing 1 installed approximately horizontally, the casing 1 having a jacket on the bottom side, and a relatively long biaxial It is a trough-shaped container of the screw conveyor type, and is fixed to a support base 3 equipped with an inclination angle adjuster 2. A heat exchange jacket 4 is provided to almost entirely cover both sides, the bottom surface, and some side surfaces of the casing 1,
There is a partition plate 5 in the center of the bottom jacket that also serves as reinforcement.
are provided in the longitudinal direction. Inside the casing 1, two hollow rotating shafts 6, 6' are spaced parallel to each other in the longitudinal direction, and these rotating shafts are mounted in bearings 7, 7' at the front and rear of the casing 1. Therefore, it is rotatably supported. In addition, both rotating shafts 6,
Gears 8, 8' are fixed to the front part of 6', and these gears 8, 8' mesh with each other to rotate in opposite directions. A sprocket 9 is provided on the rotating shaft 6', and this sprocket 9
is connected to a prime mover (not shown) via a chain (not shown).

Each rotating shaft 6, 6' has a plurality of stirring plates spaced apart in its longitudinal direction, as shown in FIG. The distance between the rotating axes is such that they are spaced apart from each other and partially penetrate into each other. Each stirring plate is divided into 1 parts as in the embodiment shown in FIG.
A pair of flat fan-shaped hollow notched stirring plates 11 or 11'
Each pair of hollow stirring plates 11, 11' has a fifth
As shown in the figure, one of the stirring plates is arranged inclined with respect to a plane perpendicular to the longitudinal axis of its corresponding shaft, and the other stirring plate is moved in parallel at approximately the same angle of inclination as one of the stirring plates. It is located almost under one of the stirring plates. In this way, the stirring plate 11,
Even if 11' is attached to the hollow shafts 6, 6', there is no problem with the attachment since they are completely separated as shown in FIG. The stirring plates 11, 11'' may all be inclined in the same direction as shown in FIG. 4A, or adjacent ones may be inclined in opposite directions as shown in FIG. 4B. In addition, the stirring plate may have a shape other than the fan shape shown in the figure, and the cross section may not be rectangular as shown in the figure, but may be triangular or diamond-shaped.In the illustrated embodiment, the stirring plate 11,1
At the trailing edge of 1' there is a small wedge-up vane 10 which operates as described below.

Covers 12, 1 are arranged alternately on the upper surface of the casing 1.
2' are installed, and each cover 12, 12' engages with the casing 1 via a gasket (not shown) to seal it. Cover 12' is handle 1
3 and can be removed if necessary. The front cover 12 has
A material supply port 14 is provided, and a discharge port 15 is provided at the rear bottom of the casing 1. A height-adjustable weir 16 is provided in the casing 1 immediately in front of the discharge port, so that the amount of substance held in the casing can be adjusted. The supply port, the central cover 12, and the discharge port 15 each have a connection port 1 for supplying and discharging a carrier gas (not shown).
7, 17', and 17 are provided, so that a cocurrent type, countercurrent type, or cocurrent type of steam discharge operation can be performed depending on the substance to be treated.

The jacket 4 is provided with connecting ports 18, 18', 18'' for heat medium inflow and outflow pipes (not shown), and the heat medium inflow and outflow pipes (not shown) are provided at the front and rear of the rotating shaft. ) are provided with stationary connection ports 19, 19'.These connection ports 19, 19' can be used appropriately depending on the heating or cooling operation and the difference in heat medium. Pressure rotary joints 20 and 20' are provided between the opening and the hollow rotating shaft.Furthermore, the inside of the hollow rotating shaft and the inside of the hollow stirring plate are communicated through connecting pipes 21 and 21'.
The heat medium can flow in and out.

In the apparatus having the above configuration, a case will be described in which a substance to be treated is heated and dried using hot water in a parallel and countercurrent manner. First, the main body is set at an optimal inclination angle using an inclination angle adjuster, and the two rotating shafts 6, 6' are gently rotated by the prime mover via the sprocket 9 and gears 8, 8'. Each shaft 6, 6' rotates in opposite directions as indicated by the arrows, as shown in FIG.
Hot water at a predetermined temperature is fed into the jacket 4 through the connection port 18, and is discharged through the connection port 18'. In this case, the connection port 18'' is used as a blow pipe connection port.On the other hand, the hot water for the rotating shafts 6, 6' and the stirring plates 11, 11' is supplied to the stationary connection port 1 at the rear.
9' and pressure rotary joint 20', and is fed through connecting pipes 21, 21' to each stirring plate 11, 1.
It flows forward while passing through 1' and is discharged through the pressure rotary joint 20 and stationary connection port 19 at the front of the shaft.

The substance to be treated is continuously supplied in a fixed amount into the casing 1 from the supply port 14, and is scraped into the inside of the casing 1 by the movement of the scraping blades 10 provided at the rear edges of the stirring plates 11 and 11'. , 11', and is transported rearward by the feed pitch of the plate or the extrusion action of the material supply described later. During the transfer, the substance is heated through heat exchange with the hot water flowing through the jacket 4, the hollow shafts 6, 6' and the hollow stirring plates 11, 11', and the moisture in the substance evaporates within the casing. The dried material overflows from the weir 16 and is discharged through the outlet 15. The carrier gas is fed through the connections 17, 17'' and flows over the material in the casing 1, taking with it the vapor evaporated from the material into the connection 17'.
is discharged through.

The automatic cleaning action of adhering substances on the stirring plates 11, 11' according to the present invention will be explained. Since the stirring plate is inclined on the rotating shaft, the stirring plate 11,1
1' is displaced every half rotation to perform a periodic swinging motion to scrape off substances adhering to the inner wall surface of the casing 1 in the axial direction and automatically and periodically remove them. Further, substances adhering between the stirring plates are removed in the following manner. 6 and 7, considering the relative movement of the shaft 6' with respect to the shaft 6, the stirring plate 11' of the shaft 6' is
The stirring plate 1 performs an oscillating motion between the
The volume of the space divided by 1 and 11' is repeatedly reduced and expanded periodically from A in FIG. 6 to B in FIG. 7. As shown in Figures 6 and 7, if the substance is trapped between the stirring plates, it will be removed beyond the outer periphery of the stirring plates 11, 11' due to the compression action during contraction, and will be removed after compression during expansion. A new substance to be treated falls into the space and is subjected to heat transfer and stirring action. This effect is particularly effective against sludge, etc.
According to the present invention, one stirring plate and the other stirring plate are installed on the rotating shaft in parallel along the circumference of the shaft, so the surface area of the plate per unit volume can be doubled, and heat transfer stirring can be performed effectively. be able to.

Furthermore, it is clear that the spacing between the stirring plates, the presence or absence of feed and return pitches, the angle of inclination of the stirring plates, etc. can be freely selected within the scope of the present invention.

As explained above, the stirring heat transfer device of the present invention has the following features:
The stirring plates spaced apart on the rotating shaft are divided, one stirring plate is tilted with respect to the longitudinal axis of the shaft, the other stirring plate is moved in parallel at approximately the same angle of inclination as one stirring plate, and one stirring plate is The stirrer plates were placed under the stirrer plates and spaced apart so that each stirrer plate on one shaft was partially inserted between the adjacent stirrer plates on the other shaft.
The surface area of the stirring plate per unit volume can be almost doubled, the stirring action has been improved, and when used in a heating drying device, the length of the shaft can be roughly halved, greatly reducing the manufacturing cost of the device. There is an excellent effect that can be done.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the heat exchange type stirring device of the present invention;
Figure 2 is a side view of Figure 1, and Figure 3 is a side view of Figure 2.
FIG. 4A is a schematic sectional view showing an example of an inclined state of the stirring plate mounted on the rotating shaft, and FIG. 4B is an enlarged cross-sectional view along the line, FIG. A diagram showing an example, FIG. 5 is a schematic side view of the stirring plate, FIGS. 6 and 7 are enlarged views for explaining the situation where the volume of the space between the stirring plates changes,
FIG. 8 is a schematic side view of a conventional stirring plate. 1... Casing, 4... Jacket, 6,
6'...Hollow shaft, 11, 11'...Stirring plate, 12,
12'...cover, 14...supply port, 15...discharge port.

Claims (1)

[Claims] 1. A substantially horizontal casing having an inlet and an outlet, and a jacket around the outer periphery of the casing,
and at least two hollow shafts spaced parallel to each other so as to be rotatable in the longitudinal direction thereof, and a plurality of hollow stirring plates communicating with the interiors of the hollow shafts spaced apart in the longitudinal direction on each of the hollow shafts. and a device for passing a heat exchange medium through the hollow shaft and the hollow stirring plate, wherein the hollow stirring plate is divided and one stirring plate is connected to the corresponding hollow shaft. one of the stirring plates is spaced apart from the other stirring plate at approximately the same angle of inclination so as to partially fit between the two stirring plates; A stirring heat transfer device characterized in that it is equipped with a drive device that rotates in different directions. 2. The stirring heat transfer device according to claim 1, wherein the hollow stirring plates on one hollow shaft are all inclined in the same direction. 3. The stirring heat transfer device according to claim 1, wherein adjacent hollow stirring heat transfer devices are inclined in opposite directions.