JPS59102430A - Device for producing mixing element - Google Patents

Abstract

PURPOSE:To provide a titled device which molds monolithically a mixing element having plural fluid passages with ease by combining a top mold member and a bottom mold member having projecting parts and a middle mold member punched with a circular hole, and charging a molten metal into the cavity formed by said members. CONSTITUTION:A recess 35 is provided on the bottom surface of the metallic plate 34 of a top metallic mold 31, and a pair of projecting parts 36, 37 are formed to the shape occupying a half of fluid passages 9, 10 in the recess 35. A circular hole 38 of the same diameter as the outside circumference of a mixing element 6 is punched in a middle metallic mold 36, and a runner 38a is formed. A projecting part 40 is provided on the top surface of the metallic plate 39 of a bottom metallic mold 33, and a pair of projecting parts 41, 42 are formed to the shape occupying the passages 9, 10 on the part 40. Such mold 31, mold 32 and mold 33 are assembled and a molten material is charged through the runner 38a into the cavity, whereby the mixing element 6 having a cylindrical fluid passage pipe 7 and a spiral vane 8 forming the passages 9, 10 is monolithically produced.

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.

The static mixer does not have a mechanical movable part 75, but has spiral blades arranged in a passage pipe, and as the fluid flows through the passage pipe, the fluid 75; FIG. 3 is a side view of a static mixer using this mixing element. Mixing element 1
and 6 are cylindrical passage pipes 2 and 7, respectively, and this passage pipe 2.
and spiral vanes 3 and 8 provided within 7, respectively. The blades 3 and 8 are twisted clockwise (clockwise rotation) and counterclockwise (left rotation) by 900 degrees, respectively, and the passage pipes 2 and 7 are partitioned off from each other to form fluid passages. 4.5 and fluid passages 9,10 are formed.

When such mixing elements 1 and 6 are inserted alternately into the cylindrical casing 11 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 obtained. is assembled. Fourth
FIG. 5 is a perspective view showing the mixing elements 12 and 17 of the 180° rotation type. Passage pipes 13 and 18
The inner part of each blade 1 rotates clockwise 1800 times in a spiral manner.
4 and similarly partitioned by 1800 counterclockwise rotating blades 19, fluid passages 15° 16 and fluid passages 2θ, 21, respectively.
is being felt.

As shown in FIG. 6, when the mixing elements 13 and 17 are alternately inserted into the casing 11 and the edges of the blades 14 and 19 are arranged at right angles to each other at the connection point of the two, a stationary type The mixer 23 is assembled 0 While the two types of fluids FA and FB flow through the fluid passages of the static mixer 22 230 configured as described above, the fluids rotate 90° or 180° in a spiral shape, After merging with the fluid flowing through the other fluid passage and being further divided, it rotates 90 degrees or 1800 times in a spiral in the opposite direction. While such rotation, merging, and division are repeated, the +ifi bodies 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. Also, depending on the core and M m used,
The mixing element 1 etc. is often constructed by integrally molding the passage pipe 2 etc. and the blades 3 etc., especially 1
In the case of an 80° rotation type mixing element, it is extremely difficult to integrally mold the passage pipe 13 and the like with the blades 14 and the like.

Therefore, usually, the blades are manufactured individually, connected in the longitudinal direction so that their edges are perpendicular to each other, and then placed in a pipe-like passage tube to manufacture a static mixer. These blades are connected by welding or brazing adjacent blades, but this welding process is difficult, and after welding, there is a bulge in the weld at the connection point of the blades. was present, causing abnormal fluid retention.

Furthermore, gaps are likely to be formed between the vanes and the passage pipes, and these gaps have been a factor in reducing the fluid mixing effect.

This invention was made in view of such circumstances, and
An object of the present invention is to provide a mixing element manufacturing device that can form a spiral blade and a fluid passage by integral molding, and can manufacture a mixing element that does not cause abnormal stagnation and has an excellent mixing effect. shall be.

According to the present invention, there is provided an apparatus for manufacturing a mixing element having a spiral blade that partitions the inside of the passage pipe to form a plurality of fluid passages, the first plate-like part and the first plate-like part; an upper mold member having a first protrusion formed in a shape that protrudes downward from the plate-like part and occupies a part of each of the fluid passages, and a hole having the same shape as the side surface of the passage pipe is bored. a plate-shaped medium-sized member;
a lower die member having a second plate-shaped portion and a second protrusion formed in a shape that protrudes upward from the second plate-shaped portion and occupies the remaining portions of the respective fluid passages; Inserting the protrusion and the second protrusion into the hole, overlapping the first plate-like part, the medium-sized member, and the second plate-like part, and inserting the protrusion into the hole, the first protrusion, and the second protrusion. The feature is that the molten material is injected into the space formed by the parts.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings. 7 is a perspective view of a manufacturing apparatus for the left-handed mixing element 6 90a, FIG. 8 is an enlarged perspective view of the mixing element 6 (see FIG. 2), and FIG. 9 is a bottom view of the mixing element 6. This manufacturing device consists of three divided molds made of aluminum or cast iron, namely, an upper mold 31. 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 projections 36, 37 provided in the recess 35 are shaped to occupy the hand portions of the fluid passages 9, 10, respectively. The middle mold 32 has a circular hole 38 bored in the thickness direction with a diameter substantially the same as the outer diameter of the mixing element 6.
and a runner 38h that opens on the circumferential surface of the circular hole 38.

The lower mold 33 includes a metal plate 39 and a protrusion 41 that protrudes above the metal plate 39.
．． 42. A thin disc-shaped protrusion 4o 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 has its plane side surface 42a connected to the plane side surface 3 of the protrusion 37.
7a (!: Molded in a shape that occupies the fluid passage 1o together with the protrusion 37 when overlapped. The diameters of the circumferential surfaces of the recess 35 and the protrusion 4o are substantially the same, and the circular hole 3
Slightly smaller than the diameter of 8.

Such a mold 31. The middle mold 32 and the lower mold 33 have protrusions 36, 37, 41 and 42.
7 flat side surface 36a.

37th and the planar side surface 41a of the protrusion 41.42.

42a are fitted into the circular hole 38 so as to be in contact with each other. Then, the blade 8
parts are formed. In addition, the protrusions 36, 37, 41,
A passage pipe 7 portion is formed between the circumferential side surface of 42 and the circumferential surface of circular hole 380. Furthermore, a passage pipe 7 is provided between the circumferential side of the recess 35 and the circumferential side of the protrusion 36, 37, 41, 42.
An inner annular projection 78 portion is formed on one end surface in the longitudinal direction. Furthermore, an outer annular protrusion 7b on the other longitudinal end surface of the passage pipe 7 is provided between the circumferential side surface of the protrusion 40 and the circumferential side surface of the circular hole 380.
parts are formed. When a molten material is injected into the cavity of the molds assembled as described above (upper mold 31, middle mold 32, and lower mold 33) through the runner 38a, this material flows as shown in FIGS. 8 and 9. It is molded into the shape shown in and solidified.

Next, a process of manufacturing the mixing element 6 by the lost wax casting method using the above-mentioned split mold will be described. First, inject into the seventh cavity. 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. This assembled low model is immersed in fireproof latex, and sand is sprinkled on the low model coated with fireproof latex to cover the Jiro model with a sand layer. A refractory layer is formed on the surface of the raw model by repeating immersion in the fireproof emulsion and coating with the sand layer.Next, the entire raw model is heated to dissolve the wax. 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. A bath melt of the material of the mixing element, such as aluminum, stainless steel, nickel, iron, copper or plastic, is poured into the mold. After the injection material solidifies, the sand mold is destroyed, and a 90° counterclockwise rotating 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 a molten plastic material instead of wax into the splitter shown in FIG. 7, instead of using the lost wax method.

When manufacturing the mixing element 17 (see FIG. 5) that rotates 180 degrees to the left, a raw model for the mixing element 6 that rotates 90 degrees to the left is first molded as described above. When the two 90° rotation type low models are connected and glued together in the longitudinal direction, the 18
A low model for the 0° rotation type mixing element 17 is obtained. If a sand mold is manufactured from this raw model as described above and a molten material such as aluminum is injected into the sand mold, a 1800-rpm mixing type having the shape shown in FIG. 4 or FIG. 5 will be created. Elements are manufactured.

A 90Q right-handed mixing element 1, an enlarged perspective view of which is shown in FIG. 10, can also be manufactured by the lost wax casting method using a split mold. 1800
Similarly, for the mixing element 12 of the clockwise rotation shop, a row model is manufactured by connecting two row models for a 90° clockwise rotation type mixing element in the longitudinal direction, and a sand mold is manufactured using this row model. , the melt of the material constituting the mixing element may be injected into this sand mold. Also, the first
As shown in a perspective view in FIG. 1, three fluid passages 44, 45 .
The mixing element 43 having a diameter of 46 can also be easily manufactured using a split mold.

As explained in detail above, according to the present invention, the process of melting the core can be omitted compared to the case of manufacturing a mixing element using a conventional core, so manufacturing is easy with fewer steps. It is. Therefore, the manufacturing cost is low and can be reduced to 115 to 1/10 of the conventional cost.

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, fluid retention can be reduced. However, according to the present invention, the roundness of the corner 8a can be easily formed by curving it in the corner direction, and by giving it roundness, the flow resistance of the fluid can be reduced. The edges can be easily rounded. Furthermore, it is not easy to manufacture a mixing element that rotates 180° when using a conventional core, but when manufacturing it by the lost wax casting method using a split mold, it is possible to rotate the mixing element by 90° as described above. A 180° rotating 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 blades are individually injection molded as in the conventional method, and then the blades are attached 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]

Figures 1 and 2 are perspective views of a 90° rotating mixing element, Figure 3 is a side view of a static mixer, Figures 4 and 5 are enlarged perspective views of a 180° rotating mixing element; 9 is a bottom view thereof, FIG. 10 is an enlarged perspective view of a 90° clockwise rotation type mixing element, and FIG. 11 is a perspective view of a mixing element having 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, sl, 32° 33... Mold, 3
4.39...Gold plate, 35...Recess, 36.37.4
1, 42... protrusion, 38... circular shape. Hole, 40...protrusion. Applicant's agent Patent attorney Takehiko Suzue -183- Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 IS4-

Claims (1)

[Claims] 1. A cylindrical passage pipe through which fluid flows, and a plurality of fluid passages formed integrally with the passage pipe and partitioned inside the passage pipe. In the mixing element manufacturing apparatus, the mixing element has a first plate-like part and a first plate-like part formed in 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 protrusion, a plate-shaped medium member having a hole having the same shape as the side surface of the passage pipe, a second plate-shaped part, and an upper mold member extending upward from the second plate-shaped part. a lower mold member having fc second protrusions formed in a shape that protrudes and occupies the remaining portions of the fluid passages, and inserts the first protrusion and the second protrusion into the hole to 1. An apparatus for manufacturing a mixing element, characterized in that a first plate-shaped part, a medium-sized member, and a second plate-shaped part are overlapped, and a bath melting material is injected into the formed space. 2. The scope of patent liability water characterized in that the molten material is molten wax, and the Mikikung element is manufactured by a lost wax method using a wax molded body solidified in the space as a raw model. 2. The mixing element manufacturing apparatus according to item 1. 3. Claim 1, wherein the molten material is a molten material of the mixing element.
An apparatus for manufacturing a mixing element as described in .