RU2042415C1 - Mixer working body - Google Patents

Abstract

FIELD: mechanical engineering. SUBSTANCE: working body of the mixer consists of two shafts 1 and 2 disposed in the vertical plane and spaced from each other at a certain distance "а". A pair of frames 3,4 and 5,6 is fixed on each shaft. The lateral sides of frames 3,4 and 5,6 are made as spatial helical lines. The length of the upper side of each frame is less than that of its lower side. The lower sides of the frames on one shaft are made as two opposite lying arcs whose convexities are directed in different directions. The lower sides of the frames on the other shaft are the specular reflection of the lower sides of the frames of the first shaft. EFFECT: simpler design. 8 dwg

Description

 The invention relates to the design of a device for mixing two or more ingredients, for example liquids, solids or combinations thereof, in particular for the production of dough, creams, pastes, etc. and also for the production of concrete.

Known working body of the mixer, containing two shafts located in a vertical plane and spaced at some distance from each other, on each of which are fixed two thin frames, orthogonally oriented to each other. The sides of the frames in the direction of rotation have a pointed edge. Shafts with rollers rotate synchronously towards each other [1]
The disadvantage of the working body of the mixer is the low efficiency of mixing the processed ingredients and the increased cost of energy and time for mixing.

Known working body of the mixer, containing two shafts located in a vertical plane and spaced from each other at some distance, each of which is fixed to one frame. And on one of the shafts of the bottom side frame is rotated relative to the upper side ^{of the} shaft 90 in a clockwise direction around the rotation axis, and the other shaft counterclockwise. In this case, the sides of the frames are spatial helical lines, and the upper and lower sides of the frames, equal in width, are made rectilinear. Shafts with frames rotate synchronously towards each other2]
The disadvantage of such a working body is the low mixing efficiency, since the speed characteristics of the working body are not fully realized at elevated rotational speeds (n≈5000 + 8000 rpm), on which modern mixers work.

 The objective of the proposed working body of the mixer is to increase the efficiency of mixing the ingredients.

 The task is that the working body of the mixer contains two parallel shafts, on each of which two frames are fixed, orthogonally oriented to each other, and the lower sides of the frames are rotated relative to the upper sides by a certain angle γ: on one shaft counterclockwise, on another clockwise. The lower sides of the frames on one shaft are made in the form of two opposite arcs, the convexities of which are directed in different directions, and on the other they are a mirror image of the lower sides of the frames of the first shaft, while the upper sides of the frames are straight and the length of the upper side of each frame is less than the length of its lower side.

 In FIG. 1 shows a structural diagram of the working body of the mixer; figure 2 view a in figure 1; figure 3 section BB in figure 1; figure 4 section bb in figure 1; 5 and 6 are a projection drawing of shafts with frames; Fig.7 scheme of the working body of the mixer; on Fig mechanism of interaction of the side of the frame with a particle of ingredient.

∠ α₁=

∠ α₂ по отношению к вертикальной плоскости 9, совпадающей с плоскостью чертежа. Высота рамок 3-6 b, длина верхних сторон рамок с, а нижних с′, причем выполняется условие

>

и c′ > С. Верхние стороны рамок 3-6, находящиеся в сечении Б-Б, выполнены прямолинейными. Нижние стороны рамок 3 и 4, находящиеся в сечении В-В, выполнены в виде двух оппозитно расположенных дуг, выпуклости которых направлены в разные стороны, а нижние стороны рамок 5 и 6 являются зеркальным отображением нижних сторон рамок первого вала (фиг.3 и 4). Рамки 3 и 4 скручены вдоль оси 7 на ∠ (-γ), достигающий в сечении В-В значения

-

gπ где g действительное число относительно сечения Б-Б. Рамки 5 и 6 скручены вдоль оси на ∠ γ достигающий в сечении В-В значения

-

gπ где g действительное число относительно сечения Б-Б. При этом боковые стороны 3 и 4 l₁,l₂,l₃,l₄ и боковые стороны рамок 5 и 6 l₅, l₆, l₇, l₈ образуют пространственные винтовые линии правого и левого вращения (фиг.5 и 6).The working body of the mixer (Figs. 1 and 2) consists of two shafts with wire frames: a pair of frames 3 and 4 is fixed on the shaft 1, and a pair of frames 5 and 6 on the shaft 2. The shafts 1 and 2 have axes 7 and 8, respectively. The distance between which a. Frames 3 and 4 are rotated relative to each other by ∠ α ₁ , and frames 5 and 6 by ∠ α ₂ , and ∠ α ₁ = ∠ α ₂ . Frames 5 and 6 are rotated relative to frames 3 and 4 by ∠ β where ∠ β

∠ α ₁ =

∠ α ₂ with respect to the vertical plane 9, coinciding with the plane of the drawing. The height of the frames is 3-6 b, the length of the upper sides of the frames c, and the lower c ′, and the condition

>

and c ′> C. The upper sides of the frames 3–6 located in section BB are rectilinear. The lower sides of the frames 3 and 4, located in section BB, are made in the form of two opposite arcs, the convexities of which are directed in different directions, and the lower sides of the frames 5 and 6 are a mirror image of the lower sides of the frames of the first shaft (FIGS. 3 and 4 ) Frames 3 and 4 are twisted along axis 7 by ∠ (-γ), reaching values in section BB

-

gπ where g is a real number relative to the BB section. Frames 5 and 6 are twisted along the axis by ∠ γ reaching values in section BB

-

gπ where g is a real number relative to the BB section. The sides 3 and 4 l ₁ , l ₂ , l ₃ , l ₄ and the sides of the frames 5 and 6 l ₅ , l ₆ , l ₇ , l ₈ form the spatial helical lines of the right and left rotation (Figs. 5 and 6 )

] и [-

] (фиг.7). Под действием вращающихся пар рамок 3, 4 и 5, 6 смешиваемые ингредиенты 11 сначала образуют две локальные вращающиеся навстречу другу другу зоны смешения 12 и 13, которые затем за счет вязкости среды инициируют движение по всему объему емкости 10. Под действием центробежных сил ингредиенты от осей вращения рамок 7 и 8 перемещаются на периферию зоны вращения рамок 3, 4 и 5, 6, т.е. образуется плоскопараллельное движение, перпендикулярное осям 7 и 8. Направление выпуклостей на нижних сторонах пар рамок 3, 4 и 5, 6 против вращения способствует некоторому торможению частиц в нижней зоне рамок, что приводит к возникновению локальных зон противотечения типа "сдвига" частиц ингредиентов, что также вызывает процесс смешения. Боковые стороны l₁, l₂, l₃, l₄, l₅, l₆, l₇, l₈ пар рамок 3, 4 и 5, 6 от верхней до нижней сторон образуют пространственные винтовые линии, которые воздействуя на частицы ингредиентов, перемещают их не только в горизонтальной плоскости S_г, но и в вертикальной S_в вдоль пар рамок 3, 4 и 5, 6, а следовательно, и по высоте емкости 10 и, кроме того, удлиняют время взаимодействия с рабочим органом, дополнительно измельчая и перемешивая ингредиенты 11 (фиг.8). Так как по высоте рамок происходит приращение линейной скорости от верхней стороны к нижней, а также из-за увеличения длины сторон рамок, в среде организуется еще дополнительное вертикальное течение, направленно сверху вниз, что способствует еще более интенсивному перемешиванию.The working body of the mixer operates as follows. The mixed ingredients 11 are placed in the container 10 and the working body of the mixer is located in it. The frames rotate synchronously towards each other in the direction of rotation (HB) with angular velocities [

] and [-

] (Fig.7). Under the action of the rotating pairs of frames 3, 4 and 5, 6, the mixed ingredients 11 first form two local mixing zones 12 and 13 rotating towards each other, which then, due to the viscosity of the medium, initiate movement throughout the volume of the container 10. Under the action of centrifugal forces, the ingredients from the axes the rotation of the frames 7 and 8 are moved to the periphery of the rotation zone of the frames 3, 4 and 5, 6, i.e. a plane-parallel motion is formed, perpendicular to the axes 7 and 8. The direction of the bulges on the lower sides of the pairs of frames 3, 4 and 5, 6 against rotation contributes to some inhibition of particles in the lower zone of the frames, which leads to the appearance of local counterflow zones such as a “shift” of the particles of ingredients, which also causes the mixing process. The lateral sides l ₁ , l ₂ , l ₃ , l ₄ , l ₅ , l ₆ , l ₇ , l ₈ pairs of frames 3, 4 and 5, 6 form spatial helical lines from the upper to the lower sides, which act on the particles of the ingredients, move them not only in the horizontal plane S _r, but in the vertical S _in along pairs frames 3, 4, 5, 6, and consequently the adjustment tank 10 and, in addition, extend the time of interaction with the working body, further pulverizing and mixing the ingredients 11 (Fig.8). Since the linear velocity increases along the height of the frames from the upper side to the lower side, and also due to the increase in the length of the sides of the frames, an additional vertical flow is organized in the medium, directed from top to bottom, which contributes to even more intensive mixing.

 In the interaxial zone 14, intensive mixing of the ingredients 11 occurs due to powerful local vortex zones, which are formed during the rotation of the pairs of frames 3, 4 and 5, 6. The spatial helicality of the lateral sides of the pairs of frames 3, 4 and 5, 6 leads to the fact that the flow along them will be twisted. The similarity of the swirling flow of mixed ingredients 11 will be from the lower sides of the pairs of frames, and the suction at the upper sides of the pairs of frames. By varying the height of the frames, the angle of rotation and the length of the lower sides of the frames 3, 4 and 5, 6, you can change the mixing intensity of the ingredients.

 As follows from the description of the design and operation of the mixer organ, it is possible to expand its experimental capabilities by adapting the organ to ingredients with different viscosity, as well as by regulating the intensity of mixing with the same ingredients, i.e. the mixer organ can be selected optimal with the same dimensions and parameters of its operation. Such an organ implements two mixing methods (centrifugal and propeller), which leads to a decrease in mixing time and, in turn, to a reduction in energy consumption, as well as to more efficient mixing of ingredients, i.e. obtaining a mixture with a finely dispersed structure, and hence more homogeneous in quality.

Claims (1)

 WORKING BODY OF THE MIXER, containing two parallel shafts, on each of which one frame is fixed with the sides in the form of spatial helical lines, characterized in that the working body is equipped with two additional frames, each of which is fixed on one of the shafts, the length of the upper side of the frame less than its lower side, while the lower sides of the frames on the first shaft are made in the form of two opposite arcs, the convexities of which are directed in different directions, the lower sides of the frames on the second shaft are made in the form of two opposite arcs, the bulges of which are directed in different directions, which are a mirror image of the lower sides of the frames of the first shaft.

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