JPS6138653Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a static mixer in which a large number of helical plate-like elements (buffle plates) are arranged in a conduit, and more specifically to a static mixer in which the joint strength between the buffle plates is increased. .

Conventional static mixers generally include a tubular housing that forms a fluid passage hole, and the housing is sequentially arranged in the axial direction so as to be divided into two parts by a plane including the shaft, and a predetermined space is placed around the tube axis. It consists of a plurality of angularly twisted baffle plates, each of which has its axial end intersecting with the end of an adjacent buffle plate.

Buffful plates have conventionally been fixed in a tubular housing by various methods, but for small-diameter housings, generally a large number of buffful plates are connected by welding the ends of the buffful plates that intersect and contact each other, and the buffful plates are attached to the ends of the tubular housing. It is common practice to fix the ends of the joint buffed plate to the inner wall of the housing tube by welding or other methods.

However, in this method of joining the buttful plates, the crossing ends at the center of the tubes are only joined to each other by butt welding, and when mixing high viscosity or large flow fluids, the torsion of the buttful plates around the axis When subjected to rotational torque, torsional stress was concentrated in the welded joint, and there was a risk that the joint would be damaged. That is, a buttful plate is normally arranged at an angle of 20 to 160 degrees, generally orthogonally, to the end of an adjacent buttful plate, and is connected with the same or opposite torsion as the adjacent buttful plate, at a predetermined angle. It is important for the function of a static mixer to join the buff-full plates together.

On the other hand, it is possible to stably fix the intermediate buttful plate of a large number of connected buttful plates in the housing tube by a method such as shrink fitting, but this method does not improve the machining dimensional accuracy of the housing tube and the buttful plate. There were problems such as it being difficult to secure and the shrink fitting process itself being not easy and requiring heating.

The object of the present invention is to provide a static mixer that has a joint strength between the ends of the baffle plates that can withstand damage to the joints due to torsional torque between the baffle plates that occurs when high viscosity fluids are mixed.

A second object of the present invention is to provide a static mixer that is easy to assemble and manufacture.

That is, in the static mixer of the type described at the beginning, the static mixer of the present invention has an axial groove formed in the center of the axial end of the buffle plate and a groove that fits into the buffle plate groove. It has a joining element that joins the ends of both bent full plates,
The joining element includes a fork-shaped protrusion that extends in the axial direction along both the front and back sides of the adjacent intersecting end plate surfaces, and a corresponding fitting groove that is formed by the protrusion and that fits into the bent full plate groove; It is characterized by comprising a crossing part connecting both protrusions.

Hereinafter, the present invention will be described in detail based on drawings showing embodiments.

In the present invention, the alternating and intersecting arrangement of the baffle plates and their adjacent ends can be appropriately selected as in conventional static mixers. That is, the intersecting angle between the ends of the buttful plates can be set to 20 to 160 degrees. An axially recessed groove is provided in the center of the buff-full plate end (corresponding to the tube axis), and is fitted into a corresponding fitting groove formed by the fork-shaped protrusion of the joining element.

In FIG. 1, a left-handed twisting buffle plate 2 and a right-handed twisting buffle plate 3 are alternately arranged in the housing tube 1 with a joining element 4 in between. Batsuful board 2, 3
The position and angle are fixed between the two ends of the double plate.
Concave grooves 2b, 3 formed in the center of a, 3a
This is done by fitting the corresponding grooves 4b, 4a of the joining element 4 into the grooves 4b and 4a of the joining element 4. In the illustrated embodiment, the ends 2a and 3a of the buff-full plate are orthogonal to each other, but when other intersecting angles are used, corresponding grooves 4a and 4b having corresponding intersecting angles are formed.

As shown in FIG. 2, the joining element 4 has a pair of fork-like protrusions 4c and 4d extending in the axial direction at axially opposite ends, and a recess is formed between the pair of fork-like protrusions (4c or 4d). Grooves 4a and 4b are formed. The grooves 4a and 4b have a width corresponding to the wall thickness of the buttful plates 2 and 3, and their axial lengths are determined as appropriate for the grooves 2b and 3b at the ends of the buttful plates and the predetermined axial positions of the ends of the buttful plates. It is set each time depending on the relationship.

The concave grooves 2b and 3b at the ends of the buttful plates are necessary not only for proper fitting, but also for mutual axial position setting at the intersection between the ends of the buttful plates 2b and 3a. If the grooves 3b are made deep, the ends 2a and 3a are arranged overlappingly in the area of adjacent buff-full plates, and if the grooves 2b and 3b are made shallow, the ends of the buff-full plates are spaced apart, but in the illustrated embodiment, They are set to touch each other in the axial direction.

Although various external shapes of the connecting element 4 are possible other than those shown in the drawings, at least there is an intersection 4e in the middle of the grooves 4a and 4b, and the intersection 4e allows the bases of the protrusions 4c and 4d on both ends to be formed. Continuous. The cross section of the intersection 4e is octagonal or octagonal as shown in FIG.
It can be formed into a substantially circular shape as shown in the figure. Projection part 4
In order to reduce the resistance to fluid flow, the tips of c and 4d are preferably cut obliquely toward the tips or provided with an r mark so that they intersect with the baffle plate at as acute an angle as possible.

FIG. 4 shows an example in which the widths of the protrusions 4c and 4d are tapered toward the tips, and FIG. 5 shows an example in which the tips of the protrusions 6c and 6d of the joining element 4 are semicircular.

Ends 2a of the buttful plates 2, 3 alternately joined by the joining elements 4 or 6 configured in this way,
3a is further welded with a welding portion 5, as shown in FIG. 4, for example, at the joint end with the joining elements 4, 6, if necessary.

Via the joining elements 4, 6, the buttful plate end 2a,
Not only is the welded portion 5 fitted into the concave grooves 2b and 3b of 3a to be joined, but also the welded portion 5 is connected to the long joining end (formed on both sides of the buttful plate) with the joining element 4, as shown in FIG. Since the welding can be performed over a range of 1 to 30 degrees, the joint strength is greatly improved compared to conventional patch welding between simply intersecting end faces.

Furthermore, the assembly of the static mixer of the present invention involves the concave grooves 2b, 3b and the concave grooves 4a, 4 of the joining element.
It is easy to fix the position both angularly and axially by fitting between the housing tube 1 and the housing tube 1. This can be easily done by inserting the tube into the tube and welding the inner wall of the housing and the circumferential edge of the buffle plate at the end of the tube.

As described in detail above, according to the present invention, it is possible to reliably increase the joint strength between the central buttful plates, which has been difficult in the past, and it is also possible to reduce assembly man-hours. There is also the advantage that the positional relationship between the ends of the full board can be set,
Effective for mixing high viscosity fluids.

Extremely overlapping arrangement in the axial position of the end portion of the baffle plate is practically undesirable, and clogging due to narrowing of the flow path is likely to occur. On the other hand, when it comes to separating them from each other, it is useful as a device based on the concept of Japanese Patent Publication No. 52-17264, and with the exception of extremely long items, devices using this type of end connection method can be used by setting the elements inside the housing pipe. (When elements are set apart from each other, there is difficulty in positioning them relative to each other.) Further, when a residence time is required immediately after the mixing action by the element, this connection method can be applied to set up this space.

In the above embodiments, it is assumed that metal is used for welding, but other known processable materials having a specified strength and corrosion resistance against mixed fluids can be selected, such as ceramics. , glass, plastics, composite materials, etc. can be used alone or in combination.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view cut away in the tube axis direction showing an embodiment of the present invention, Fig. 2 is an enlarged view of the part within the circle in Fig. 1, Fig. 3 is an end view in the direction of the arrow in Fig. 2, Fig. 4, FIG. 5 shows different embodiments. 1: Housing tube, 2, 3: Full plate (2
a, 3a: end, 2b, 3b: concave groove), 4, 6:
Connection element (4a, 4b, 6a, 6b: groove, 4
c, 4d, 6c, 6d: protrusion).

Claims (1)

[Scope of utility model registration request] It consists of a housing tube that forms a fluid passage hole, and a plurality of buffle plates arranged sequentially in the tube axis direction within the tube and twisted at a predetermined angle about the tube axis, and the axial ends of the buffle plates are adjacent to each other. In the static mixer of the type arranged to intersect with the ends of the buffle plate, an axial groove formed in the center of the axial end of the buffle plate, and a groove fitted in the buff full plate groove. and a joining element for joining the ends of both buttful plates, the joining element being formed by a fork-shaped protrusion extending in the axial direction along both the front and back sides of the adjacent crossed end plate surfaces, and the protrusion. A static mixer comprising a corresponding fitting groove that fits into the buff-full plate concave groove, and an intersection portion that connects both protruding portions.