CN101234309B - Double helical ribbon multi-layer oar blade scraping cutter type stirrer - Google Patents

Abstract

A double helical ribbon stirrer with multiple layers of blade scrapers comprises a stirring shaft (5), helical ribbons (2), support blades (1), separate blades (4) and a soft scraper (3). The support blades (1) and the separate blades (4) are layered and arranged on the stirring shaft (5), and the support blade and the separate blade of each layer are arranged on the stirring shaft (5) symmetrically, and the support blade (1) and the separate blade (4) keep a dip beta of 10 degrees to 45 degrees with the radical level section, and smaller dip can reduce the loss of useful work effectively. The helical ribbons (2) are connected with the stirring shaft (5) through the support blades (1) which have the functions of connecting ribs and strengthening ribs, thus causing reasonable structure design of the whole stirrer. The soft scraper (3) is divided into two sections which are fixed on the top of the helical ribbons (2) symmetrically, and an angle alpha between the soft scraper (3) and a still wall is 20 degrees to 60 degrees. The soft scraper (3) can scrape sticky material on the stirring still wall in time, thus solving the problem of incomplete mixing on the surface of the still wall and avoiding the damage to the still wall. The stirrer of the invention provides a material system that can adapt to different viscosities, in particular to the material system which has large viscosity variation range in a short time.

Description

A double-screw multi-layer blade scraper stirrer

technical field

The invention relates to a stirrer, in particular to a double-screw ribbon multi-layer paddle blade scraper type stirrer which can be applied to material systems with different viscosities at the same time, especially suitable for materials with a wide range of viscosity changes in a short period of time.

Background technique

Agitators are widely used in petroleum, chemical, food, light industry, pharmaceutical and other industrial fields. Under the action of the agitator, the materials in the gas-liquid, liquid-liquid, liquid-solid and other systems are dispersed and uniformly mixed, which strengthens the mass transfer and heat transfer, and strengthens the chemical reaction process. According to different material characteristics and mixing purposes, the types of agitators used are also different, mainly including: paddle agitator, impeller agitator, anchor and frame agitator, etc.

For the mixing of high-viscosity materials, it is very important whether the shape and design of the agitator are reasonable. The past experience is to operate in the laminar flow area, choose a frame or anchor agitator with a diameter close to the kettle wall, or a ribbon agitator; for pseudoplastic fluids, use a multi-layer folded blade paddle or ribbon agitator near the center The mixer is used in combination with a rim-anchored stirrer. But among these two methods, the stirring effect of the former is not good enough, and the structure of the latter is more complicated. In addition, high-viscosity materials are prone to stirring dead zones during the stirring process, and materials are easy to accumulate on the wall of the stirred tank. In order to overcome the above defects, the Chinese patent CN2429251Y designed a plate and frame stirrer for stirring viscous materials. This patent realizes the large circulation flow of the fluid and has better mixing performance, but it does not solve the problem of the material attached to the reactor. side wall problem. Although Chinese patents CN2738875Y and CN2430211Y have solved the problem of material attached to the wall, the structure of the agitator designed by the Chinese patent CN2738875Y is too complicated, and the maintenance and daily maintenance of the agitator are not used, and the equipment investment cost is expensive; and the Chinese patent CN2430211Y is a scraping wall The agitator has a relatively simple structure and is suitable for mixing two-phase materials with large density differences. However, it is not suitable for mixing high-viscosity materials due to the tie bars between the stirring frame and the scraper.

Contents of the invention

The purpose of the present invention is to solve the problems and deficiencies in the background technology, and to provide a double-screw belt multi-layer blade scraper type that can be applied to low-viscosity materials, high-viscosity materials and material systems with a large range of viscosity changes in a short period of time. mixer.

The object of the present invention is achieved in that it is composed of a stirring shaft, a screw ribbon, a supporting paddle, an independent paddle and a flexible scraper, and is characterized in that the supporting paddle and the independent paddle are symmetrically installed on the stirring shaft respectively, and the same layer The inclination angle β between the inner supporting blade and the independent blade and the radial horizontal section is 10°-45°, the ribbon is connected with the stirring shaft through the supporting blade, and the flexible scraper is symmetrically fixed on the top of the ribbon in two sections, upper and lower. The angle α between the flexible scraper and the kettle wall is 20°-60°.

Add a certain viscosity material system into the stirring tank, start the transmission equipment to drive the stirring shaft, the independent paddles installed on the stirring shaft, the supporting paddles and the screw belt connected to them through the supporting paddles to rotate. The material is evenly mixed under the double agitation of independent paddles, supporting paddles and ribbons. When the flexible scraper at the top of the ribbon rotates, it can promptly and efficiently scrape off the viscous material attached to the kettle wall, completely solving the problem of uneven mixing caused by the viscous material attached to the kettle wall.

Compared with the prior art, the present invention has the following advantages:

① The present invention can realize the stirring of various viscosity material systems, especially suitable for material systems with a large range of viscosity changes in a short period of time;

②The paddle structure design of the present invention strengthens the radial circulation flow mixing of materials, and the ribbon structure design strengthens the axial circulation flow mixing of materials. Can achieve excellent mixing effect;

③The ribbon structure in the present invention also acts as a baffle, which can eliminate the "cylindrical turning zone" in the center of the reactor under turbulent flow conditions, so that the mixed flow can achieve material recovery under the effects of shearing, crushing, dispersing and kneading. mix well;

④The paddle structure design of the present invention can ensure that liquid-liquid separation is effectively avoided when the liquid-liquid system is mixed, so that the temperature in the reactor is uniform; when the liquid-solid system is mixed, solid settlement can be prevented;

⑤ The multi-layer paddle structure layout in the present invention, in addition to ensuring the radial circulation flow mixing of materials, can also promote the axial circulation flow mixing of the ribbon;

⑥The supporting paddle in the present invention connects the ribbon and the stirring shaft together to play the role of connecting ribs and reinforcing ribs, making the structure design of the whole agitator more compact;

⑦The inclination angle β between the supporting blade and the independent blade and the radial horizontal section is 10°-45°, and a smaller inclination angle can effectively reduce the loss of useful work and reduce the operating cost of the equipment;

⑧ The flexible scraper can scrape the wall of the stirring tank in time, completely solve the problem of uneven mixing caused by the viscous material attached to the wall of the kettle, and at the same time avoid damage to the wall of the kettle when the scraper scrapes the wall of the kettle.

Description of drawings

Figure 1 is a schematic diagram of the structure of the agitator

Figure 2 is a schematic diagram of the installation of supporting blades and independent blades

Figure 3 is a schematic diagram of the scraper structure

Figure 4 is a schematic diagram of the supporting blade structure

Figure 5 is a schematic diagram of the independent blade structure

As shown in the figure, 1 is a supporting paddle, 2 is a ribbon, 3 is a flexible scraper, 4 is an independent paddle, and 5 is a stirring shaft.

Detailed ways

The agitator is composed of a supporting paddle 1, a ribbon 2, an independent paddle 4, a stirring shaft 5 and a flexible scraper 3. The supporting paddle 1 and the independent paddle 4 are symmetrically installed on the stirring shaft 5 respectively, and the support installed on each layer The inclination angle β between the paddle 1 and the independent paddle 4 and the radial horizontal section is 10°-45°, the ribbon 2 is connected with the stirring shaft 5 through the supporting paddle 1, and the flexible scraper 3 is symmetrically fixed on the ribbon 2, the angle α between the flexible scraper 3 and the wall is 20°-60°.

Load the material system to be mixed with a certain viscosity in the stirring tank, start the transmission equipment to drive the stirring shaft 5, the independent paddle 4 installed on the stirring shaft 5, the supporting paddle 1 and the screw connected to the stirring shaft 5 through the supporting paddle 1 Belt 2 turns. The material is evenly mixed under the dual stirring of the independent paddle 4, the supporting paddle 1 and the screw belt 2. When the flexible scraper 3 at the top of the ribbon 2 rotates, it can promptly and effectively scrape off the material bonded on the wall of the kettle.

Claims (4)

1. A double-screw ribbon multi-layer blade scraper type agitator is composed of a stirring shaft (5), a ribbon (2), a supporting blade (1), an independent blade (4) and a flexible scraper (3), It is characterized in that the supporting paddle (1) and the independent paddle (4) are respectively symmetrically installed on the stirring shaft (5), the ribbon (2) is connected with the stirring shaft (5) through the supporting paddle (1), and the flexible scraper (3) divided into upper and lower sections symmetrically fixed on the top of the spiral band (2). 2. A kind of double-screw ribbon multi-layer blade scraper type agitator as claimed in claim 1, characterized in that said supporting blade (1) and independent blade (4) are divided into 3-5 layers and installed in the stirring on the shaft (5). 3. A double-screw ribbon multi-layer blade scraper type agitator as claimed in claim 1, characterized in that in each layer of blades, the supporting blades (1) and the independent blades (4) are respectively symmetrical Installed on the stirring shaft (5), the inclination angle β between the supporting paddle (1) and the independent paddle (4) and the radial horizontal section is 10°-45°. 4. A kind of double-screw ribbon multi-layer blade scraper type agitator as claimed in claim 1, it is characterized in that described flexible scraper (3) divides upper and lower two sections and is symmetrically fixed on the top of spiral ribbon (2), flexible The angle α between the scraper (3) and the wall of the kettle is 20°-60°.