JP2014226633A - Gas-liquid agitation blade - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas-liquid agitation blade capable of acquiring a satisfactory gas absorption performance, i.e., an excellent gas-liquid performance, and capable of being easily applied even to agitation vessels of different depths and sizes.SOLUTION: Blade body parts 2A and 2B which are formed in such a way that a clearance is formed between the confronting faces of a pair of upper and lower blades 2a and 2b and the clearance becomes narrower in the rotational direction of the blades, are attached radially at a plurality of vertical stages to a revolving shaft 3. The blade body parts 2A and 2B of the upper and lower steps are attached at rotational angles different from each other to the revolving shaft 3, and are attached at continuous portions without any axial clearance to the revolving shaft 3.

Description

  The present invention relates to a stirring blade used for stirring and mixing gas and liquid in the food industry, the chemical industry, and the like.

  A general method of gas-liquid stirring and mixing is to supply liquid and gas into a stirring tank, rotate the stirring blade in the stirring tank to reduce the size of gas bubbles, and disperse the gas bubbles into the liquid. Thus, the retained fraction of dispersed gas bubbles in the liquid is increased, that is, the gas absorption efficiency is increased.

  As a conventional stirring blade of this type, as shown in FIG. 8, a pair of upper and lower blades b are arranged radially around a rotation axis c, and a gap is formed between the opposed surfaces of the pair of blades b. When the stirring blade a is rotationally driven while supplying liquid and gas into the stirring tank, the vertical distance between the pair of upper and lower blades b is increased toward the wake side. Thus, the fluid that flows in at a high speed between the pair of upper and lower blades b decreases in speed and increases in pressure as it moves backward in the blade b, and is generated on the back surfaces of these upper and lower blades b. It is known to prevent the formation of bubble accumulation by suppressing the formation of negative pressure, which tends to improve gas absorption performance, that is, gas-liquid performance (see Patent Document 1).

Japanese Patent No. 3919262

  According to this conventional agitating blade a, in order to further improve the gas-liquid performance, it is necessary to dispose more pairs of upper and lower blades b radially around the rotating shaft c. As the number of wings increases, it becomes physically impossible to install. That is, even if 8 or 12 blades are attached to the boss, for example, welding cannot be performed and attachment is not possible. Further, when many blades are provided, there is a problem that the discharge efficiency is lowered due to the interference between the front and rear blades, and the gas-liquid performance is also lowered.

  An object of the present invention is to provide a gas-liquid agitating blade capable of solving such problems and obtaining good gas-liquid performance.

  In order to achieve this object, the present invention forms a gap between the opposed surfaces of a pair of upper and lower wings and forms the gap so as to narrow toward the rotation direction of the wings. The wing body portion formed so as to become wider toward the top is attached to a rotating shaft in a plurality of upper and lower stages radially.

  According to the present invention, good gas absorption performance, that is, good gas-liquid performance is obtained, and furthermore, a gas-liquid stirring blade that can be easily applied to stirring tanks having different tank depths and sizes. The effect that can be provided.

It is a perspective view of the stirring blade for gas-liquid of Example 1 of this invention. It is a front view of this stirring blade. It is a top view of this stirring blade. It is sectional drawing of a wing body part. It is a perspective view of the stirring blade for gas-liquid of Example 2 of this invention. It is a front view of this stirring blade. It is a top view of this stirring blade. It is a perspective view of the conventional gas-liquid stirring blade.

  The example of the form for carrying out the present invention is shown below.

  A first embodiment of the present invention will be described with reference to FIGS.

  1 is a perspective view of a gas-liquid stirring blade according to a first embodiment of the present invention, FIG. 2 is a front view of the stirring blade, FIG. 3 is a plan view of the stirring blade, and FIG. 4 is a sectional view of a blade body. .

  Reference numeral 1 denotes a gas-liquid stirring blade of this embodiment, 2A and 2B denote a plurality of blade bodies of the gas-liquid stirring blade 1, and these blade bodies 2A and 2B are respectively connected to the upper blade 2a and the lower blade 2b. It consists of a pair of upper and lower wings, and is fixed to the upper and lower stages radially around the hub portion 3a of the rotating shaft 3 at intervals of 90 degrees. Then, as shown in FIG. 4, a distance d is formed between the tip portions in the rotational direction of the upper wing 2a and the lower wing 2b of each wing body 2A, 2B, and the distance between the facing surfaces of the upper wing 2a and the lower wing 2b. Was formed so as to become narrower in the rotation direction A.

  The upper wing 2a and the lower wing 2b are flat wings, and are formed vertically symmetrical.

  Each upper wing body portion 2A and each lower wing body portion 2B are fixed around the hub portion 3a with an angular difference of 45 degrees in the rotational direction between the upper and lower tiers. The upper stage wing body part 2A and the lower stage wing body part 2B are fixed to the hub 3a in a continuous position without any gap in the axial direction of the rotary shaft 3.

  Next, the operation and effect of the gas-liquid stirring blade 1 of the first embodiment will be described.

  A gas-liquid stirring blade 1 is suspended in a stirring tank (not shown), and the gas-liquid stirring blade 1 is rotationally driven in the direction of arrow A while supplying liquid and gas into the stirring tank. .

  In each of the upper wing body portion 2A and the lower wing body portion 2B, the distance between the opposing surfaces of the pair of upper and lower wings composed of the upper wing 2a and the lower wing 2b is formed so as to narrow toward the rotation direction A. As a result of the rotational drive of the rotary shaft 3, the fluid flowing at a high speed from the gap d between the upper wing 2a and the lower wing 2b decreases in speed and goes to the wake side in the wing, and the pressure is increased. Ascending and discharging, suppressing the formation of negative pressure that tends to occur on the back surface of the upper wing 2a or the lower wing 2b, thus reducing the particle size of the gas bubbles and dispersing the gas bubbles into the liquid Is done.

  In the first embodiment, the upper stage wing body part 2A and the lower stage wing body part 2B are attached at different positions in the rotational angle direction, so the upper stage wing body part 2A and the lower stage wing body part 2B are attached. The body part 2B discharges the liquid as an independent discharge field, and performs a stirring action to disperse the gas bubbles in the liquid. Further, since the upper wing body portion 2A and the lower wing body portion 2B are fixed to the upper and lower portions which are continuous in the hub portion 3a, the upper wing body portion 2A and the lower wing body portion described above. The independent discharge flow of 2B becomes a concentrated stirring action in a common basin.

  However, if all of the wing bodies are provided on the same plane, the discharge flow of the wing bodies will affect each other and the stirring action will be reduced, and the upper and lower wing bodies will be lowered. If the wing body portions are above and below the same rotation angle position, the respective discharge flows from the upper and lower wing body portions are generated at the same rotation angle position and affect each other, thereby reducing the stirring action. Further, if the upper and lower wing parts are fixed to the upper and lower parts separated at a distance in the hub part 3a, the above-mentioned independent discharge flow is concentrated in the common basin. In this case, an agitation effect cannot be obtained, and the power for rotationally driving the rotary shaft 3 becomes large, which is not preferable in terms of efficiency.

  A second embodiment of the present invention will be described with reference to FIGS.

  5 is a perspective view of a gas-liquid stirring blade of Example 2 of the present invention, FIG. 6 is a front view of the stirring blade, and FIG. 7 is a plan view of the stirring blade.

  In the second embodiment, unlike the gas-liquid stirring blade 1 of the first embodiment, which is composed of the upper blade body portion 2A and the lower blade body portion 2B, the gas-liquid stirring blade is used. The wing 1A is composed of three stages of an upper wing body part 2C, an intermediate wing body part 2D, and a lower wing body part 2E, and an upper wing body part 2C and an intermediate wing body part 2D. Are fixed around the hub portion 3a with an angular difference of 30 degrees relative to each other in the rotational direction, and the intermediate wing body portion 2D and the lower wing body portion 2E are also mutually in the rotational direction. The upper wing body 2C, the intermediate wing body 2D, and the lower wing body 2E are fixed around the hub 3a with an angle difference of 30 degrees. In the axial direction, the hub portion 3a is fixed to a continuous portion without a gap.

  Next, the action and effect of the gas-liquid stirring blade 1A of the second embodiment will be described.

  When the gas-liquid stirring blade 1A is suspended in a stirring tank (not shown) and the liquid and gas are supplied into the stirring tank, the gas-liquid stirring blade 1A is rotationally driven in the direction of arrow A. The same effects as those of the first embodiment are produced.

  In particular, in the second embodiment, the upper stage wing body part 2C, the intermediate stage wing body part 2D, and the lower stage wing body part 2E are constituted by three stages of wing body parts. A common flow area in which the discharge flow of the independent discharge field by the blade body part 2C and the discharge flow of the discharge field of the lower-stage blade body part 2E are centered on the discharge flow of the discharge field of the intermediate-stage blade body part 2D This produces a concentrated stirring action at, which becomes even stronger.

  In the above-described embodiment, the gas-liquid stirring blade 1 is configured by the two-stage or three-stage blade body. However, the gas-liquid stirring blade 1 may be configured by four or more blade bodies according to the depth of the stirring tank. Good.

  In the above embodiment, the wing body portions 2A, 2B, 2C, 2D, and 2E are fixed to the hub portion 3a. However, the wing body portions 2A, 2B, 2C, 2D, and 2E are connected to the rotating shaft. 3 may be attached and fixed.

  In the above embodiment, the upper wing 2a and the lower wing 2b are flat wings, but may be wings having an arcuate cross section or wings having an airfoil cross section.

  Also, depending on the properties of the liquid or gas to be stirred, the stirring blades 1 and 1A are driven to rotate in the direction opposite to the arrow A, and the gap between the upper blade 2a and the lower blade 2b becomes wider toward the blade rotation direction. You may do it.

  Furthermore, the blade diameters of the blade bodies at each stage may be changed in order to enhance the flow in an arbitrary direction or to enhance the shearing action at the center.

  The stirring blade of the present invention is used for gas-liquid mixing in the food industry, the chemical industry, and the like.

DESCRIPTION OF SYMBOLS 1 Stirring blade 1A Stirring blade 2 Blade body part 2A Blade body part 2B Blade body part 2C Blade body part 2D Blade body part 2E Blade body part 2a Upper blade 2b Lower blade 3 Rotating shaft

Claims (3)

  A wing body in which a gap is formed between the opposing surfaces of a pair of upper and lower wings, and the gap is formed so as to become narrower in the direction of rotation of the wings, or the gap is formed so as to become wider in the direction of rotation of the wings. A gas-liquid stirring blade in which the parts are attached to the rotating shaft in a plurality of stages on the upper and lower sides.   2. The gas-liquid stirring blade according to claim 1, wherein the blade body portions of the upper and lower adjacent stages are attached to the rotating shaft at angles of different rotation directions.   The gas-liquid stirring blade according to claim 2, wherein the blade body portions of the upper and lower adjacent stages are attached to the rotating shaft at continuous locations without any gap in the axial direction.

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