JPS6377529A - Agitation device - Google Patents

Abstract

PURPOSE:To improve heat conduction and mixing and agitating efficiency by providing a fluid guide cylinder and a revolving shaft in a cylindrical vessel, inserting a helical ribbon type agitator blade in the clearance between the vessel and the fluid guide cylinder, and providing a heat exchanger to the inside of the fluid guide cylinder. CONSTITUTION:An arm 6 is provided at substantially right angle to the revolving shaft 5 inserted to the cylindrical vessel 1. The fluid guide cylinder 8 is concentrically fixed to the vessel 1 by plural leg 9. And the helical ribbon type agitator blade 10 is provided to the clearance between the fluid guide cylinder 8 and the vessel 1 and is rotated with the revolving shaft 5, and a multitubular heat exchanger 12 is provided to the inside of the fluid guide cylinder 8. In this condition, the fluid between the vessel 1 and the fluid guide cylinder 8 receives shearing forces from both inner wall of the vessel 1 and outer wall of the fluid guide cylinder 8 by the rotation of the helical ribbon type agitator blade 10, and is circulated to be perfectly mixed and agitated. And then the circulated fluid is efficiently heated or cooled by the multitubular heat exchanger 12.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a mixer for stirring and mixing liquid substances while performing heat exchange to obtain a uniform product, and a mixer for stirring and mixing liquid substances while performing heat exchange.
This invention relates to a stirring device that can be used in a polymerization reaction apparatus, etc. for polymerizing while performing polymerization to obtain a high-viscosity polymeric substance.

(Prior art) Stirring devices conventionally used for heating or cooling at the same time as stirring include a screw type (Fig. 3) with an internal heating medium cylinder (draft tube), a helical ribbon type with a draft tube, and a helical ribbon type stirring device. There are the raker type (Fig. 4), the helical ribbon raker type (Fig. 5), which has a draft tube and a heat exchanger installed outside the draft tube. In addition, in FIGS. 3, 4, and 5, 1 is a container, 2 is a lid, 3 is a fluid supply port, 4 is a fluid discharge port, 5 is a rotating shaft, 6 is an arm, 7 is a support rod, 8a is an internal heat medium cylinder (draft tube), 10 is a helical ribbon stirring blade, 11 is a container jacket, 15 is a supply port for the heat medium to the container jacket, 16 is a heat medium discharge port from the container jacket, 17
18 is a heat medium supply port from the draft tube, 19 is a scraping blade, 20 is a coil type heat exchanger, 21 is a heat medium supply port of the coil type heat exchanger, 22 is the heat medium outlet of the coil heat exchanger.

(Problems to be solved by the invention) The screw type with draft tube (Fig. 3) has the following features:
As the viscosity of the reactant increases, both mixing and heat transfer become insufficient, making it unusable.In addition, the helical ribbon scraper type with draft tube (Figure 4) has a built-in draft tube for helical ribbon stirring. The mixture is stirred and transferred using blades, and the annular space formed by the draft tube and the inner wall of the reactor is stirred using scraping blades and stirring blades.
Since the inner and outer walls of the draft tube are thoroughly cleaned by these helical ribbon stirring blades and scraping blades, heat transfer is extremely good even in the case of high viscosity, but it is possible to use a relatively small capacity device with a large heat transfer area. The device itself becomes elongated in order to obtain
Moreover, since the feed helical ribbon type stirring blade is located only inside the draft tube and not in the outer annular portion, there are problems such as insufficient circulation of reactants and incomplete mixing.

In addition, the helical ribbon scraper type (Fig. 5), which has a draft tube and a heat exchanger installed outside the draft tube, has a higher heat transfer capacity than the helical ribbon scraper type with draft tube. Although it has the advantage of being large in area, it has the disadvantage that the helical ribbon stirring blade is located inside the draft tube and is not present in the outer annular part, so the reactants are not sufficiently circulated and mixing is incomplete. There was a problem.

The present invention aims to provide a stirring device that can solve the above-mentioned conventional problems.

(Means for Solving the Problems) Therefore, the present invention provides a cylindrical container, a cylindrical fluid guide tube installed inside the cylindrical container concentrically with the container, and a rotary tube installed concentrically with the container. a shaft, an arm attached substantially perpendicular to the rotating shaft, a helical ribbon-shaped stirring blade attached to the arm and inserted into the gap between the container and the fluid guide tube, and a helical ribbon stirring blade installed inside the fluid guide tube. The system is equipped with a heat exchanger with a heat exchanger, and uses this as a means to solve the problem.

(Function) As the helical ribbon stirring blade rotates, the fluid between the cylindrical container and the fluid guide tube receives shearing force from both the inner wall of the container and the outer wall of the fluid guide tube, and circulates within the container. . This circulating flow is heated or cooled by a heat exchanger inside the fluid guide tube. Since the heat exchanger of the present invention is installed inside the fluid guide cylinder, the heat transfer area of the heat exchanger portion is much larger than the area of the inner surface of the container or the surface of the fluid guide cylinder, so it is difficult to install a device with the same capacity. However, a larger heat transfer area can be obtained.

(Embodiments) The present invention will be described below with reference to embodiments shown in the drawings. FIGS. 1 and 2 show first and second embodiments of the present invention. First, a first embodiment of the present invention will be described with reference to FIG.
are respectively provided, and a rotating shaft 5 is inserted from the upper part concentrically with the container 1. Further, an arm 6 is attached to the rotating shaft 5 substantially at right angles to the rotating shaft 5, and support rods 7 are attached downward from both ends of the arm 6.

Further, a fluid guide tube (draft tube) 8 is fixed to the container 1 by a plurality of legs 9 so as to be concentric with the container 1, so that fluid can pass between each leg 9. A helical ribbon type stirring blade 10 is installed in the gap between the fluid guide tube 8 and the container 1, and since this is attached to the support rod 7, the helical ribbon type stirring blade 10 rotates with the rotation of the rotating shaft 5. do.

A multi-tubular heat exchanger 12 is installed inside the fluid guide cylinder 8, and is provided with a supply port 13 and a discharge port 14 for a heat medium for heating or cooling. As the helical ribbon stirring blade 10 rotates, the fluid between the container 1 and the fluid guide cylinder 8 is subjected to shearing forces from both the inner wall of the container 1 and the outer wall of the fluid guide cylinder 8, and circulates within the container. This circulating flow is heated or cooled in a shell-and-tube heat exchanger 12.

In the present invention, as described above, by providing the helical ribbon type stirring blade lO in the gap between the fluid guide cylinder 8 and the container 1, it is possible to install the helical ribbon type stirring blade inside the fluid guide cylinder as in the conventional device. It is possible to obtain a circulation approximately twice as large as the previous one.

FIG. 2 shows a second embodiment of the present invention in which the heat exchanger is a coil type heat exchanger 12a, and FIG. Heat medium outlet 17
However, there is no difference in function and effect.

Regarding the types of heat exchangers mentioned above, the shell-and-tube heat exchanger 12 shown in FIG. 1 and the coil-type heat exchanger 12 shown in FIG.
In addition to the two types a, other types of heat exchangers may be used.

(Effects of the Invention) As described above, in the present invention, the heat exchanger is installed inside the fluid guide tube, and the helical ribbon type stirring blade is installed in the gap between the fluid guide tube and the container. Compared to the conventional case installed inside the cylinder, the circulation flow rate is approximately twice as large, which not only allows for more thorough mixing or agitation, but also allows for a larger heat transfer area of the heat exchanger for the same capacity equipment. is obtained, and the heat transfer effect is extremely good.

The helical ribbon stirring blade has the function of causing the fluid driven by the stirring blade to flow with the shearing force received from the wall surface in proportion to the shear rate difference with the wall surface and the viscosity of the fluid itself. When a helical ribbon type stirring blade is installed inside the fluid guide cylinder like a conventional stirring device,
The shearing force described above is generated only on the side of the stirring blade that faces the guide cylinder.

In the present invention, since the helical ribbon stirring blade is provided in the gap between the outer wall of the fluid guide cylinder and the inner wall of the container, the shearing force is applied to both the side of the stirring blade facing the fluid guide outer wall and the side facing the inner wall of the container. As a result, it is possible to obtain a circulating flow rate that is approximately twice as large as that in the case where the same stirring blade is provided inside the fluid guide cylinder. Therefore, not only is the mixing or stirring more complete, but the heat transfer effect is also very good.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view of a heat exchanger according to a first embodiment of the present invention, in which the type of heat exchanger is a shell-and-tube heat exchanger, and FIG. 2 is a longitudinal sectional view of a heat exchanger according to a second embodiment of the present invention. Longitudinal cross-sectional views, Figures 3, 4, and 5 of the coil heat exchanger type are the conventional screw type with an internal heat medium cylinder (draft tube), and the ribbon screw scraper type with a draft tube. FIG. 2 is a longitudinal sectional view of each ribbon screw blade type stirring device having a draft tube and a heat exchanger installed outside the draft tube. Explanation of main parts of the figure 1 - Cylindrical container 2 - Lid 3 - Fluid supply port 4 - Fluid discharge port 5 - Rotating shaft 6 - Arm 7 - Support rod 8 - Fluid guide cylinder 10-Helical ribbon stirring blade 12...-Multi-tubular heat exchanger 12a...Coil heat exchanger patent Applicant: Mitsubishi Heavy Industries, Ltd. ¥2 Figure 3 Figure 4

Claims (1)

[Claims] a cylindrical container, a cylindrical fluid guiding tube installed inside the cylindrical container concentrically with the container, a rotating shaft installed concentrically with the container, an arm attached substantially at right angles to the rotating shaft; A stirring device comprising a helical ribbon stirring blade attached to the arm and inserted into a gap between the container and the fluid guide tube, and a heat exchanger installed inside the fluid guide tube. .