JPS6055174B2 - Mixing element manufacturing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for manufacturing a mixing element used in a static mixer for mixing two or more types of fluids.

A static mixer has no mechanically moving parts, and has spiral blades disposed within a passage tube, and the fluids are mixed by flowing through the passage tube.

1 and 2 are perspective views of a 90° rotation type mixing element, and FIG. 3 is a side view of a static mixer using this mixing element. The mixing elements 1 and 6 have cylindrical passage tubes 2 and 7, respectively, and helical vanes 3 and 8 provided in the passage tubes 2 and 7, respectively. These blades 3 and 8 are clockwise (clockwise rotation)
The blades 3 and 8 partition the passage pipes 2 and 7, respectively, to form fluid passages 4 and 5 and fluid passages 9 and 10, respectively. When such mixing elements 1 and 6 are inserted alternately into the cylindrical casing 111 and arranged with the edges of the blades 3 and 8 of the mixing elements 1 and 6 perpendicular to each other, a static mixer 22 is created. is assembled. 4 and 5 are perspective views showing 1800 rotation type mixing elements 12 and 17. The inner parts of the 7-channel pipes 13 and 18 are provided with a spiral blade 14 that rotates 1800 degrees to the right and a blade 1 that similarly rotates 1800 degrees to the left.
9 to form fluid passages 15 and 16 and fluid passages 20 and 21, respectively.

As shown in FIG. 6, when the mixing elements 13 and 17 are alternately inserted into the casing 11 and the edges of the vanes 14 and 19 are arranged perpendicularly to each other at the connection point of the two elements, static mixing is achieved. The vessel 23 is assembled.
While the two types of fluids FA and FB flow through the fluid passages of the static mixers 22 and 23 configured as described above, the fluids rotate spirally 900 or 180 times and flow through the other fluid passage. After merging with the flowing fluid and further splitting, it spirals 90 degrees or 180 times in the opposite direction.

While such rotation, merging, and division are repeated, the fluids are mixed. If a mixing element as described above is manufactured by casting using a core, the manufacturing process of the mixing element is complicated and the manufacturing cost is extremely high.

In addition, in the case of casting using a core, it is difficult to manufacture the mixing element 1 etc. by integrally molding the passage pipe 2 etc. and the blades 3 etc., especially in the case of a 180 rotary type mixing element. It is extremely difficult to integrally mold the passage pipe 13 and the like and the blades 14 and the like. Therefore, usually, the blades are manufactured individually, and after the blades are connected in the longitudinal direction so that their edges are perpendicular to each other, the blades are placed in a vibrator-like passage pipe to manufacture a static mixer. This connection of blades is done by fixing adjacent blades by welding or brazing, but in addition to this welding work being difficult,
After welding, there is a raised part of the weld at the connection point of the blade,
This was causing abnormal fluid retention. In addition, gaps tend to form between the vanes and the passage pipes, and these gaps are a factor in reducing the fluid mixing effect. The present invention has been made in view of the above circumstances, and it is possible to form a spiral blade and a fluid passage by integral molding, thereby preventing abnormal stagnation and providing excellent mixing effects. An object of the present invention is to provide a mixing element manufacturing device that can manufacture mixing elements.

The mixing element manufacturing apparatus according to the present invention includes a cylindrical passage pipe A through which a fluid flows, and a plurality of passage pipes provided integrally with the passage pipe inside the passage pipe and partitioning the inside of the passage pipe. In an apparatus for manufacturing a mixing element having a spiral blade forming a fluid passage, the mixing element is formed into a first plate-like part and a shape that protrudes downward from the first plate-like part and occupies a part of each of the fluid passages. an upper mold member having a first protrusion, a plate-shaped medium member having a hole having the same shape as the side surface of the passage pipe, a 72nd plate-shaped part, and the second plate-shaped member. a lower mold member having a second protrusion formed in a shape that protrudes upward from the part and occupies the remainder of the fluid passage, and the first protrusion and the second protrusion are inserted into the hole. The first plate-shaped part, the medium-sized member, and the second plate θ-shaped part are inserted, and the molten material is injected into the space formed by the hole, the first protrusion, and the second protrusion. It is characterized by this.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 7 is a perspective view of a manufacturing device for a 90-plane counterclockwise seven-turn type mixing element 6, and FIG.
2), and FIG. 9 is a bottom view of the mixing element 6. This manufacturing equipment consists of three separate molds made of aluminum or cast iron, namely an upper mold 3.
1. It has a middle mold 32 and a lower mold 33. The upper mold 31 has a metal plate 34 and protrusions 36 and 37 that protrude below the metal plate 34. A recess 35 in the shape of a thin disc is provided on the lower surface of the metal plate 34. A pair of protrusions 36 and 37 provided within the recess 35 are shaped to occupy half of the fluid passages 9 and 10, respectively. The middle mold 32 has a circular hole 38 bored in the thickness direction with substantially the same diameter as the outer peripheral diameter of the mixing element 6, and a runner 38a opening in the circumferential surface of the circular hole 38. The lower mold 33 has a metal plate 39 and protrusions 41 and 42 that protrude above the metal plate 39. A thin disc-shaped protrusion 40 is provided on the upper surface of the metal plate 39. The protrusion 41 provided on the protrusion 40 is shaped to occupy the fluid passage 9 together with the protrusion 36 when its planar side surface 41 a is overlapped with the planar side surface 36 a of the protrusion 36 . Similarly, the protrusion 42 is shaped to occupy the fluid passage 10 together with the protrusion 37 when its planar side surface 42a is overlapped with the planar side surface 31a of the protrusion 37. The circumferential diameters of the recess 35 and the protrusion 40 are substantially the same and are slightly smaller than the diameter of the circular hole 38. The mold 31, the middle mold 32, and the lower mold 33 have the protrusions 36, 37 and the protrusions 41, 42 connected to the protrusion 36.
, 37 and the planar side surfaces 41a, 42a of the projections 41, 42, respectively, are fitted into the circular hole 38 and assembled.

Then, one blade 8 portion is formed between the spiral side surfaces of the protrusions 36 and 42 and between the spiral side surfaces of the protrusions 37 and 41. Further, a passage pipe 7 portion is formed between the circumferential side surfaces of the protrusions 36, 37, 41, and 42 and the circumferential surface of the circular hole 38. Furthermore, the peripheral side of the recess 35 and the protrusions 36, 37, 4
An inner annular projection 7a portion of one end surface in the longitudinal direction of the passage pipe 7 is formed between the inner annular projection 7a and the circumferential side surface of the passage pipe 7. Furthermore,
Between the circumferential side of the protrusion 40 and the circumferential side of the circular hole 38, an outer annular protrusion 7b portion of the other longitudinal end surface of the passage pipe 7 is formed. A runner 38a is installed in the cavity of the mold (upper mold 31, middle mold 32, and lower mold 33) assembled as described above.
When the molten material is injected through the tube, the material solidifies into the shape shown in FIGS. 8 and 9. Next, a process of manufacturing the mixing element 6 by the wax casting method using the above-mentioned split mold will be described.

First, the split mold shown in FIG. 7 is assembled as described above.
The molten wax is injected into the mold cavity through the runner 38a. Then, the injected wax solidifies and a raw model having the shape shown in FIG. 8 is formed. This raw model is taken out from the mold and a plurality of pieces are connected so as to be suitable for casting. The assembled low model is immersed in a fireproof latex, and sand is sprinkled on the low model coated with the fireproof latex to cover the low model with a layer of sand. A refractory layer is formed on the surface of the raw model by repeating such immersion in the refractory emulsion and coating with the sand layer. Next, the wax is eluted by heating the entire raw model. When the remaining sand mold is fired at a high temperature, a mold having a space corresponding to the shape of the mixing element 6 is manufactured. Inside this mold,
Injecting the melt of the constituent material of the mixing element, such as aluminum, stainless steel, nickel, iron, copper or plastic. After the casting material solidifies, the sand mold is destroyed, and a 900 left-rotation type mixing element 6 having the shape shown in FIG. 8 is taken out. When the constituent material of the mixing element is plastic, the mixing element may be manufactured by directly injecting molten plastic material instead of wax into the split mold shown in FIG. When manufacturing the left-handed mixing element 17 (see Fig. 5), first 90
A row model for the zero left rotation type mixing element 6 is molded as described above.

Then, by connecting the two 900-rotation type row models in the longitudinal direction and gluing them together, a row model for the 180-rotation type mixing element 17 having a shape as shown in FIG. 5 is obtained. A sand mold is manufactured from this raw model as described above,
By injecting a melt of a mixing element constituent material such as aluminum into this sand mold, a 180-piece rotary mixing element having the shape shown in FIG. 4 or FIG. 5 is manufactured. A 90-inch clockwise rotating type mixing element 1, an enlarged perspective view of which is shown in FIG. 10, can also be manufactured by the stow wax casting method using a split mold.

Similarly, for the 1800 right-handed mixing element 12, a row model is produced by connecting two row models for a 900 right-handed mixing element in the longitudinal direction, and this row model is used to manufacture a sand mold. , the melt of the material constituting the mixing element may be injected into this sand mold.

In addition, as shown in the perspective view in FIG. 11, three fluid passages 4
The mixing element 43 having numbers 4, 45, and 46 can also be easily manufactured using a split mold. As explained in detail above, according to the present invention, compared to the case of manufacturing a mixing element using a conventional core, it is possible to omit the step of melting the core, thereby reducing the number of steps and making the manufacturing process easier. Therefore, manufacturing cost is low.
It can be lowered to the conventional 115 to 1110.
Further, according to the present invention, since the passage pipe and the vane are integrally molded, there is no gap between them, and therefore, it is possible to manufacture a mixing element with a high fluid mixing effect. On the other hand, as shown in FIG. 8, by rounding the corner 8a of the fluid passage near the boundary between the blade 8 and the passage pipe 7, it is possible to reduce fluid retention. Accordingly, the rounded corner portion 8a) can be easily formed. Further, by forming the end edge 8b of the blade 8 by curving it in the thickness direction and giving it a rounded shape, it is possible to reduce the flow resistance of the fluid. According to the present invention, the roundness of the blade end edge can be easily made can be formed into Furthermore, it is not easy to manufacture a 180-ton rotating mixing element when using a conventional core, but when manufacturing it by the mouth-stirring casting method using a split mold, as mentioned above, it is difficult to manufacture a 180-tooth rotating mixing element. A 180-row rotary mixing element can be easily manufactured by simply connecting rotary row models in the longitudinal direction. Furthermore, when manufacturing a mixing element having three fluid passages as shown in FIG. 11, the conventional method is to injection mold only the blades alone and then attach the blades by welding or brazing. However, according to the present invention, it is possible to easily manufacture a mixing element in which the blade and the passage pipe are integrally molded.

[Brief explanation of the drawing]

1 and 2 are perspective views of a 90-meter rotary mixing element, FIG. 3 is a side view of a static mixer, FIGS. 4 and 5 are perspective views of a 180-meter rotary mixing element, and FIG. 7 is a perspective view of the device of the present invention, FIG. 8 is an enlarged perspective view of a 900 left-rotating mixing element, FIG. 9 is a bottom view thereof, and FIG. 10 is a 900 left-rotating mixing element.
Enlarged perspective view of large clockwise rotating mixing element, No. 11
The figure is a perspective view of a mixing element with three fluid passages. 1, 6, 12, 17, 43... Mixing element, 2, 7, 13, 18... Passage pipe, 3, 8, 14, 1
9... Feather, 4, 5, 9, 10, 15, 16, 20,
21... Fluid passage, 31, 32, 33... Mold, 3
4,39...Gold plate, 35...Recess, 36,37,4
1, 42... Protrusion, 38... Circular hole, 40...
Protrusion.

Claims (1)

[Scope of Claims] 1. A cylindrical passage pipe through which fluid flows, and a plurality of fluid passages that are integrally provided inside the passage pipe and partition the inside of the passage pipe. In the mixing element manufacturing apparatus having a spiral blade, a first
an upper mold member having a plate-like part and a first protruding part formed in a shape that protrudes downward from the first plate-like part and occupies a part of each of the fluid passages; and a shape of a side surface of the passage pipe. A medium-sized plate-shaped member having holes of the same shape, a second plate-shaped member, and a second plate-shaped member formed in a shape that protrudes upward from the second plate-shaped member and occupies the remaining portions of the fluid passages. a lower mold member having a protrusion, and inserting the first protrusion and the second protrusion into the hole to remove the first plate-like part, the middle-sized member, and the second plate-like part. An apparatus for manufacturing a mixing element, characterized in that a molten material is injected into a space formed by the overlapping parts, the hole, the first protrusion, and the second protrusion. 2. The mixing element according to claim 1, wherein the molten material is molten wax, and the mixing element is manufactured by a lost wax method using a wax molded body solidified in the space as a raw model. manufacturing equipment. 3. Claim 1, wherein the molten material is a melt of a constituent material of the mixing element.
An apparatus for manufacturing a mixing element as described in .