JPH03106427A - Stirring blade for high delivery flow - Google Patents

Abstract

PURPOSE:To reduce stirring power and to enhance stirring efficiency by mounting respective blades to an agitating element so as to incline the same in the rotary direction of the element so that the speeds of the fluid flowing along the blades at the respective positions of a plurality of the blades constituting the agitating element become same. CONSTITUTION:A boss 9 having a disc 10 fixed thereto is mounted to a stirring shaft 4 and a plurality of blades 11 are fixed to the periphery of the disc 10 to constitute an agitating element 1. Further, the respective blades 1 are mounted to the disc 10 so as to be inclined with respect to the rotary direction of the agitating element so that the speeds of the fluid flowing along the respective blades become the same value at the respective positions of the blades. As a result, the flow in the diameter direction due to the blades increases and the mixing capacity of the fluid in the whole of a tank is enhanced and stirring power per a unit volume is reduced and stirring efficiency is enhanced.

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a stirring blade, and in particular to a stirring machine suitable for one-liquid mixing. This relates to stirring blades used in rotating machines, etc. [Conventional technology 1] Conventional stirring blades are either radially oriented flat blades (commonly known as flat blade turbines), or Types with curved blades (commonly known as curved flat blade turbines) were used. A related example of this type of device is, for example, Japanese Patent Publication No. 178/1983.

[Problem to be solved by the invention]

The above conventional technology does not take into account uniform mixing of the fluid, and the speed of the fluid flowing along the blade differs at each position of the blade. The disadvantage was that the discharge flow rate was low, and a thin layer easily formed near the blades, making it difficult to mix the entire tank sufficiently, resulting in low stirring efficiency. The purpose of the present invention is to increase the discharge flow in the radial direction by the blades,
It improves the cohesiveness of the fluid throughout the tank and reduces the stirring power per unit volume! The object of this invention is to provide a stirring blade for high discharge flow that can improve stirring efficiency.

[Means for Solving the Problems 1] In order to achieve the above object, a stirring blade is constituted by a plurality of blades and a disk, and each blade is attached at an angle with respect to the rotational direction of the stirring blade. The velocity of the fluid flowing along the blade is the same at each position. [Function] The circumferential speed due to the rotation of the blade is low on the inner diameter side of the entire length of the conventional blades that make up the stirring blade, and as it goes to the outer diameter side, the circumferential speed increases in proportion to the radius. Therefore, if the blades are installed parallel to the tangential direction of rotation inside the blade, the velocity of the fluid flowing along the blade can be made the same value at each position of each blade. [Embodiment] An embodiment of the present invention will be explained below with reference to FIGS. 1 and 2. In the figure, the stirring blade 1 is driven by a shaft sealing device 3 by a drive device 2.
, rotates via the stirring shaft 4 and stirs the fluid 6 in the tank 5. A jam plate 8 is provided on the tank wall side 7 of the tank interior 5. The stirring blade l consists of a boss 9, a disk lO, a blade 11, and a key l2. The blade 11 is attached parallel to the rotational direction x-x of the blade inner part 11a. For this reason,
The velocity of the fluid flowing along each blade is the same at each position of the blade. This will be explained below using Figure 2. If Ra is the radius of the inner blade part 11a, Va is the circumferential speed, and Ua is the fluid flow along the blade, Ua at the inner blade part 11a is equal to Va. Further, if the radius at an arbitrary position 1 lb of the blade is Rb, the peripheral speed is Vb, and the fluid flow along the blade is ub, then ub can be found by the following equation. Ub=VbXCOSab ---1-1--(
1) Rh V b = V a x − −−−−−=−−−−−
---1- (2) Ra Ra COSαb= ---
--(3) Rb Here, ab is an arbitrary position 1lb of the blade and the inside part 1 of the blade.
This is the angle with respect to the axis of 1a. (1) and (2),
Find Ub by substituting equation (3). =Va According to the above, the velocity of the fluid flowing along the blade at any arbitrary position of each blade is the same, and its value is equal to the rotational circumferential speed of the blade inner part 11a. As each blade 11 rotates, the fluid 6 in the tank 5 collides with each part of the blade l1. The colliding fluid flows toward the outer circumference along the surface of the blade ll. Since this flow velocity is the same in each part,
The fluid that collides with each part is discharged to the outer periphery very smoothly, without any thinness or turbulence. In the case of conventional flat-blade turbines, the flow of fluid that impinges on the blades is extremely complex, with many local eddies and turbulence occurring, which is difficult to explain theoretically. However, with the structure of the present invention, the discharge flow is theoretically very smooth as described above, so the discharge flow rate in the radial direction is greatly improved. As shown in FIG. 1, this discharged fluid is circulated vertically in the tank by the friction plate 8, so that the mixing properties of the metal bodies in the tank can be improved. In addition, since there is less local turbulence, the stirring power is lower and stirring efficiency can be improved. [Effects of the Invention] According to the present invention, the discharge flow rate in the radial direction can be improved by each blade, and the mixing properties of the metal bodies in the tank are improved.
Since the flow through the blades is smooth, the stirring power can be reduced, and the stirring efficiency can be greatly improved.

[Brief explanation of drawings]

Claims (1)

[Claims] 1. Each blade is installed at an angle with respect to the rotating direction of the stirring blade so that the speed of the fluid flowing along the blade is the same at each position of the plurality of blades that constitute the stirring blade. A stirring blade for high discharge flow characterized by: 2. Attach a boss with a disk fixed to the stirring shaft, and configure a stirring blade by fixing multiple blades around the disk, so that the velocity of the fluid flowing along each blade is the same at each position of the blade. , a stirring blade for high discharge flow, characterized in that each blade is attached at an angle with respect to the rotating direction of the stirring blade.