JP2015142888A - Method for producing agitation unit of static mixer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce an agitation unit of a static mixer with the small number of processing man-hours and at a low cost.SOLUTION: In a method for producing an agitation unit 4 of a static mixer 1 constituted by an external cylinder 2 and the agitation unit 4 where a plurality of elements 8a, 8b arranged within the external cylinder 2 and twisted to a reversed direction alternately are continued in a longitudinal direction in a state of deviating with phases from a long band-like material 6, the plurality of elements 8a, 8b twisted to a reversed direction alternately are continuously shaped by using a pipe 12 having an inside diameter of the same as the external cylinder 2 or smaller and a length corresponding to one of the elements 8a, 8b and performing twisting processing to the band-like material 6 in a state of inserting the band-like material 6 into the pipe 12.

Description

  The present invention relates to a method for manufacturing a stirring unit of a static mixer.

  A static mixer is a static mixing and stirring device that does not require a driving force, and has been used in various fields because of low pressure loss and high mixing efficiency. For example, excellent effects can be obtained not only by mixing fluids but also by homogenization, gas absorption, reaction, heating, heat exchange, etc., such as petrochemical, textile industry, food industry, water treatment industry, paper pulp industry, etc. It is used in a wide range of fields.

  The static mixer includes an outer cylinder and a stirring unit disposed inside the outer cylinder (paragraph 0028 of Patent Document 1, FIG. 1). The stirrer unit includes a plurality of elements that are alternately twisted in the opposite directions by about 180 ° around the axis, and are continuously arranged in the longitudinal direction with the adjacent elements being shifted in phase by a certain angle. The outer cylinder is connected to the pipe at both ends, and when a fluid is passed through the outer cylinder, it is disturbed while passing through an element that is alternately twisted in the opposite direction and out of phase by a certain angle. A flow is generated, and the fluid is stirred and mixed. By being divided into two by each element and flowing in the reverse direction, they are mixed uniformly.

  The static mixer is manufactured by brazing. That is, a paste-like metal brazing is applied to the contact portion between the helical outer periphery of the stirring unit and the inner wall surface of the outer cylinder, the stirring unit is set in the outer cylinder, and heated in a high-temperature furnace to remove the metal brazing. Melt (paragraph 0003 of Patent Document 1).

  Regarding the manufacturing method of the stirring unit, there are roughly two types known. One of them is a method in which a plurality of elements are separately manufactured and then joined together by welding or the like to obtain one stirring unit (paragraph 0032 of Patent Document 1, FIG. 1). The other is a method of manufacturing a stirring unit having a plurality of continuous elements from a long band-shaped material (paragraph 0003 of FIG. 16 and FIG. 16).

JP 2009-106817 A JP 05-32002 A

  When a stirring unit is manufactured by connecting a plurality of elements one by one by brazing, there is a problem that the number of steps is large and the manufacturing cost is high. In addition, it is difficult to perform brazing with high accuracy in a state where the stirring unit is set at a predetermined position in the outer cylinder, and there remains a problem on the processing surface. For example, if the outer diameter of the stirring unit is not within the virtual cylindrical surface having the same or smaller diameter than the inner diameter of the outer cylinder, or if the stirring unit is not straight, the stirring unit may be inserted into the outer cylinder. It becomes difficult. Moreover, even if it can insert, brazing will not be performed successfully, if the clearance between the outer periphery of a stirring unit and the inner wall face of an outer cylinder is too wide, or is non-uniform | heterogenous. If the gap remains, it may cause a short path of fluid, and the reliability of the static mixer as a product becomes a problem.

  These problems occur regardless of the above two manufacturing methods of the stirring unit. Therefore, in any case, in order to be able to easily set the stirring unit at a predetermined position in the outer cylinder with an appropriate clearance, correction work is indispensable as a subsequent process. In this respect, there are limits to man-hour reduction.

  Accordingly, an object of the present invention is to provide a method for producing a stirring unit of a static mixer that has a small number of processing steps and is low in cost.

The present invention uses a pipe whose diameter is the same as or smaller than the inner diameter of the outer cylinder and whose length corresponds to one of the elements of the stirring unit, and is twisted in a state where a strip-shaped material is inserted into the pipe. The problem is solved by executing the process. That is, the method for producing a stirring unit of a static mixer according to the present invention includes an outer cylinder and a plurality of elements arranged in the outer cylinder and alternately twisted in the opposite directions, continuously in the longitudinal direction in a state of being out of phase. A method of producing the stirring unit of a static mixer constituted by a long strip-shaped material,
Using a pipe having an inner diameter equal to or smaller than that of the outer cylinder and a length corresponding to one of the elements, the band-shaped material is twisted with the band-shaped material inserted into the pipe. By applying, a plurality of the elements alternately twisted in the opposite directions are continuously formed.

According to the present invention, it is possible to manufacture a stirring unit of a static mixer with a small number of processing steps and at a low cost.
Specifically, since the plurality of elements of the agitation unit are continuously formed from the strip-shaped member, a significant man-hour reduction can be achieved as compared with the case where the elements are welded together.
In addition, by twisting the band-shaped member with the band-shaped member inserted into the pipe, the outer diameter of the formed element falls within the inner diameter of the pipe, so that the outer diameter of the stirring unit is corrected. No post process is required.

(A)-(D) are process drawings for demonstrating the formation process of the element of a stirring unit. (A), (B) is a manufacturing-process figure of the stirring unit in the case of providing a notch. It is a longitudinal cross-sectional view of a standard static mixer.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  First, referring to FIG. 3, a standard static mixer 1 includes an outer cylinder 2 and a stirring unit 4 disposed inside the outer cylinder 2. Usually, the outer cylinder 2 is a cylindrical body made of stainless steel or other metal. The size should be appropriately determined according to the application, but the inner wall surface is finished with high cylindricity and smoothness. As shown in the figure, flanges are provided at both ends of the outer cylinder 2 or pipe screws (not shown) are connected to the middle of the pipe and used as in-line mixers in various apparatuses and facilities.

  The stirring unit 4 has a shape in which left-twisted elements 8a and right-twisted elements 8b are alternately arranged in the longitudinal direction. Each element 8a, 8b is twisted about 180 ° around the axis of the agitating unit 4, and the adjacent elements 8a, 8b are twisted in opposite directions. Furthermore, the agitating unit 4 has a relationship in which adjacent elements 8a and 8b intersect each other by about 90 °. That is, the rotational phase around the axis is different between the element 8a and the element 8b.

  The size of the agitating unit 4 should be appropriately determined according to the application. However, the outer diameter of the agitating unit 4 is precisely and smoothly applied by polishing the outer periphery of the agitating unit 4 as necessary. Finish. In particular, when the outer cylinder 2 and the stirring unit 4 are joined by brazing, the clearance between the inner wall surface of the outer cylinder 2 and the outer peripheral edge of the stirring unit 4 is set to fall within a predetermined range.

  The stirring unit 4 is brazed to the outer cylinder 2 by melting a brazing material (not shown) interposed between the outer peripheral edge of the stirring unit 4 and the inner wall surface of the outer cylinder 2 by surface tension. Specific examples of the brazing material include nickel brazing (BNi-2) defined by JIS Z 3265, which has high bonding strength and excellent heat resistance and corrosion resistance. By heating a paste-like brazing paste kneaded with an organic polymer binder having no solid residue such as carbon after heating, # 100 mesh fine nickel solder and an organic solvent, the organic components are decomposed or vaporized. And the metal component melts and solidifies. An acrylic polymer is mentioned as an organic polymer type | system | group binder, Toluene is mentioned as an organic solvent.

Next, the manufacturing method of the stirring unit 4 will be described with reference to FIG.
As shown in FIG. 1A, a long strip-shaped material 6 for forming the stirring unit 4 is prepared. In the example, an SPHC steel plate having a thickness of 1.6 to 3.2 was used as the strip material 6. The width dimension of the strip-shaped material 6 may be the same as or slightly smaller than the inner diameter of the outer cylinder 2 (see FIG. 3). The length of the strip-shaped material 6 may be a length sufficient to form a desired number of elements, and the remaining portion may be excised using a longer one.

  As shown in FIG. 1 (B), the belt-shaped material 6 is held by a clamp 14. At this time, the length of the strip-shaped material 6 protruding from the clamp 14 is equivalent to the length corresponding to one pitch of the elements 8a and 8b, and a margin for gripping by the twist jig 16 (see FIG. 1C) is added. Set to be length.

  Then, the pipe 12 is fitted on the strip-shaped material 6 protruding above the clamp 14. The length of the pipe 12 corresponds to one pitch of the elements 8a and 8b. 1B, the length of the strip-shaped material 6 protruding from the upper end of the pipe 12 in a state where the lower end of the pipe 12 is in contact with the clamp 14 corresponds to the grip margin.

  In addition, the pipe 12 used in the Example is obtained by cutting a carbon steel pipe for piping (SGP) 25A defined in JIS G 3452 into a predetermined length, and has an inner diameter of 27.6 mm, an outer diameter of 34.0 mm, and a meat The thickness is 3.2 mm. That is, it is assumed that the inner diameter of the outer cylinder 2 (see FIG. 3) is substantially the same as the inner diameter of the pipe 12.

1st twist process Then, as shown in FIG.1 (C), the edge part of the strip | belt-shaped raw material 6 protruded from the upper end of the pipe 12 is gripped with the twist jig | tool 16, and is twisted 180 degrees to the left. Thereby, the left twist element 8a is formed.

Next, as shown in FIG. 1D, the clamp 14 is loosened, and the belt-shaped material 6 is pulled out from the clamp 14 by a length corresponding to one pitch of the elements 8a and 8b. If it says according to FIG.2 (D), it will raise upwards.

Second Twist Step Then, as described with reference to FIG. 1C, the belt-shaped material 6 is gripped by the twist jig 16, but this time, it is twisted 180 ° counterclockwise (clockwise). As a result, a right twist element 8b is formed. Note that the right twist element 8b may be formed first, and in this case, the left twist is used here.

  At the stage where the second twisting process is completed, a pair of adjacent elements 8a and 8b are formed. Therefore, by repeating the first twisting step and the second twisting step by the desired number of elements, the stirring unit 4 in which the elements 8a and 8b twisted by 180 ° in the opposite directions are alternately and continuously formed can be obtained.

  Further, if necessary, the adjacent elements 8a and 8b can be twisted by a predetermined angle, for example, 90 °. In that case, by making the notch 10 between the adjacent elements 8a and 8b, not only processing is facilitated, but also distortion and deformation of the belt-shaped material 6 accompanying twist processing can be suppressed. Although the form of the cut 10 is arbitrary, for example, it can be a groove shape cut in the mutual direction from the edges on both sides of the strip-shaped material 6. The depth of cut should be set in consideration of the twist angle, the plate thickness of the strip-shaped material 6, the material hardness, and the like.

  In one stirring unit 4, the angle between the elements 8a and 8b may vary. For example, when the target value is 90 °, it may vary within a range of 80 ° to 100 °. The angles between the elements 8a and 8b do not have to be the same, and can be changed sequentially or at random in the longitudinal direction of the stirring unit 4.

  In FIG. 2, the band-shaped material 6 in which a desired number of elements 8a and 8b have been formed is provided with a cut 10 in a portion between the elements 8a and 8b (FIG. 2B), and then the adjacent elements 8a. And the element 8b is twisted by 90 ° (FIG. 2C).

  In this manner, after forming the cuts 10 between all the elements 8a and 8b of the strip-shaped material 6 after the formation of the desired number of elements 8a and 8b, a predetermined angle is twisted at each cut 10 part. In addition to performing the work, the notch 10 may be provided between the elements 8a and 8b, and the work of twisting by a predetermined angle may be repeated each time. Alternatively, the cut 10 may be provided in the band-shaped material 6 first. For example, when the first twist process and the second twist process described above are sequentially performed, a cut 10 is provided in the band-shaped material 6 prior to the first twist process, and then an element group is formed by the first twist process, and then the second twist process. Twist between elements by the process to make the phase different.

  The embodiment is applied to an agitation unit of a static mixer provided in an engine oil or LLC (coolant) circulation system in an engine test apparatus, and an IH heater is provided around the static mixer so that a fluid flowing inside is provided. It was made to heat. It is also possible to configure a heat exchanger by providing a jacket on the outer periphery of the outer cylinder of the static mixer.

  Although the embodiments have been described with reference to the drawings, the present invention is not limited to the embodiments described and illustrated herein, and various modifications can be made without departing from the scope of the claims. Can do.

DESCRIPTION OF SYMBOLS 1 Static mixer 2 Outer cylinder 4 Stirring unit 6 Strip material 8a, 8b Element 10 Notch 12 Pipe 14 Clamp 16 Twist jig

Claims (2)

The stirrer unit of a static mixer comprising an outer cylinder and a stirrer unit that is arranged in the outer cylinder and includes a plurality of elements that are alternately twisted in the reverse direction and continuously arranged in the longitudinal direction with a phase shift Is manufactured from a long strip-shaped material,
Using a pipe having an inner diameter equal to or smaller than that of the outer cylinder and a length corresponding to one of the elements, the band-shaped material is twisted with the band-shaped material inserted into the pipe. A method of manufacturing a stirring unit of a static mixer, wherein the plurality of elements alternately twisted in the reverse direction are continuously formed by applying. Forming a notch with a predetermined depth from both sides in the width direction of the band-shaped material at the boundary between adjacent elements of the band-shaped material;
2. The stirring of a static mixer according to claim 1, further comprising a step of shifting a phase of adjacent elements by a predetermined angle by gripping the belt-like material on both sides of the cut in the longitudinal direction of the belt-like material and relatively rotating them in opposite directions. Unit manufacturing method.

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