JPH02240489A - Polygonal tube and focusing tube - Google Patents

Abstract

PURPOSE:To prevent deficiencies such as torsion, etc., and the occurrence of error in arrangement by giving the form of fluorine resin and in a cross-section polygonal and tubular shape. CONSTITUTION:A tube 11 is formed of fluorine resin into a cross-section polygonal and tubular shape. The fluorine resin is tetrafluoroethylene- hexafluoropropylene copolymer(FEP resin), tetrafluoroethylene- perfluoroalkylvinylether copolymer(PFA resin) or ethylene-tetrafluoroethylene copolymer(ETFE resin). It is also acceptable to make the polygonal tube 11 into such a focusing tube that wall faces are opposed to each other and grouped in an adhesive arrangement to encircle the periphery with a focusing member. As a result, it is possible to prevent deficiencies such as torsion, etc., and the occurrence of error in arranging a number of tubes, leading to easy and prompt work.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to polygonal tubes and focusing tubes, e.g.
Fluororesin tubes for transporting chemicals, corrosive fluids, solutions, fuels, lubricants, etc., heat exchange, steam transport, piping for experimental equipment, etc., with electrical insulation, chemical resistance, heat resistance, and weather resistance. This invention relates to polygonal tubes and focusing tubes with excellent properties.

(Prior art) Conventionally, tubes made of fluororesin include, for example,
As shown in Figure 12, it is tubular with a circular cross section and has a wall thickness of d.
, are uniform, and there is no tube 1 with a polygonal cross section. Tube 1 made of fluororesin and having a circular cross section is made by putting granular fluororesin into a normal extrusion molding machine, and extruding the gel-like resin from the resin passage hole between the die and the nipple in the head of the extrusion molding machine using a sizing tie. After forming it into a tube shape, it is cooled and solidified by passing it through a water tank. Tube 1 has an inner diameter of 0
．． The length is 8 to 11 m, and the wall thickness is approximately uniform at 0.1" 1.0m.

When the tube 1 is used as a tube for transferring fluid flowing between devices or as piping for an experimental device, the end 1a of the tube 1 is inserted into the circular recess of the mouth for installing the device or experimental device. Then, fix it by screwing and tightening, for example, with a cap nut or the like.

(Problem to be Solved by the Invention) However, since both the cross-sectional shape and the mounting opening of the tube 1 are circular, when the tube 1 is screwed and fixed, the tube 1 rotates together with the bag nand, and the tube 1 is twisted. There is a problem in that distortion remains and may cause failure during use.

Furthermore, when a large number of tubes 1 are attached to a large number of attachment ports of a device or device, there is also the problem that the tubes 1 are all circular in cross section, resulting in incorrect piping.

If a tube with a polygonal cross section is absolutely necessary, the tube with a circular cross section is heated with an electric heating iron or the like to soften it and form it into a polygonal shape. For this reason, there is a problem that it is extremely time consuming.

In addition, when a large number of tubes 1 are bundled and used for piping, transportation, etc., as shown in FIG. There is a focusing tube 4 whose periphery is surrounded by a focusing member 3 such as a tape or tube. However, since the tubes 1 have a circular cross-section, the tubes 1, seen in cross-section, contact each other only at points or at small contact areas IC, with large gaps 5 between these contact areas IC. For this reason, in the case of fluid transfer, there is a problem in that, with the focusing tubes 4 having the same cross-sectional area, the transfer efficiency is low by the area of the gap 5.

Further, in the case of the heat exchange focusing tube 4, when heat is exchanged between the tubes 1, there is a problem that the contact area between the tubes 1 is small and the heat exchange efficiency is low.

Further, in the focusing tube for piping, there is a problem in that the space utilization efficiency is low when piping is installed within a certain space.

Furthermore, since the tube 1 has a circular cross section, the positions of the tubes l within the focusing tube 4 may move or shift due to bending or vibration during use, and the tubes 1
There is also the problem that the positions of the tubes 1 are not fixed, which may cause incorrect piping when the ends of each tube 1 are attached to the respective attachment ports of a device or device.

Therefore, the present invention prevents problems such as twisting when attaching a tube made of fluororesin to the installation port of a device, and also allows piping to be done easily and quickly without causing incorrect piping when piping a large number of tubes. In addition, the transport efficiency during fluid transfer is high (the heat exchange efficiency is high, the space utilization is large, and the position of the tube within the focusing tube is constant, preventing incorrect piping or installation errors. The purpose is to provide a focusing tube.

(Means for Solving the Problems) A polygonal tube according to claim 1 of the present invention is characterized in that it is made of fluororesin and has a polygonal cross-section and a tubular shape.

The focusing tube according to claim 2 of the present invention is characterized in that a plurality of polygonal tubes made of fluororesin and having a regular polygonal cross section are arranged so that the wall surfaces face each other and are in close contact with each other, and the bundled periphery is surrounded by a focusing member. There is.

Here, the term "polygon in cross section" refers to a regular polygon in cross section, a scalene polygon, and a shape in which at least one side is curved toward the center or outside of the polygon, for example, even if the cross section is drum-shaped or drum-shaped. good.

In addition, as a fluororesin, tetrafluoroethylene-
Examples include hexafluoropropylene copolymer (FEP resin), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA resin), and ethylene-tetrafluoroethylene copolymer (ETFE resin).

Further, the regular polygon in cross section may be any shape such as a regular triangle in cross section, a regular quadrilateral in cross section, a regular hexagon in cross section, etc., as long as the peripheral walls on each side are in close contact with each other and are tightly bundled.

In addition, as a converging member, for example, a string may be wound in a helical manner to bundle and converge a plurality of tubes having a regular polygonal cross section, a tape may be wrapped around the peripheral wall, or a material such as vinyl chloride or urethane resin may be used. It may be bundled with heat shrink tubing or ceramic insulation.

(Function) Since the polygonal tube according to claim 1 of the present invention has a polygonal cross section, when a large number of tubes are attached between devices or to an experimental device, the specific polygonal end of the tube is A particular polygonal attachment corresponding to can only be inserted into the mouth, and a different attachment cannot be inserted or attached to the mouth because its shape does not match. Therefore, there is no possibility of incorrect piping when piping a large number of tubes.

In addition, the shape of the end of the polygonal tube and its installation determine the piping light simply by matching the shape of the opening and inserting it. Therefore, piping can be done simply, easily, and quickly.

In addition, each corner of the polygon at the end of the polygonal tube fits into each corner of the opening, so rotate a cap nut etc. around the outside of the polygonal tube to tighten it to the opening. Even if fixed,
The polygonal tube does not rotate together with the cap nut, and the tube does not twist or become distorted.

Further, there is no need to heat and soften a tube made of fluororesin with a circular cross section using an electric heating iron and mold it into a hexagonal cross section.

In the focusing tube according to claim 2 of the present invention, tubes having a regular polygonal cross section are bundled so that the circumferential walls of adjacent tubes on each side face each other and are tightly bound together without any gaps. Tubes have high transport efficiency, high usage efficiency within a certain space, and heat exchange between tubes that are in close contact with each other is performed over the entire area of the peripheral wall, so the heat exchange rate is high. Furthermore, since the tubes have a regular polygonal cross section, the positions of each tube and each other remain constant without moving when the sleeve that bundles the regular polygonal tubes is bent and vibrates, and the regular polygonal tubes are bundled together. The cross-sectional shape of the tube is polygonal, so the mounting position to the equipment is constant, and the position relative to the surroundings is fixed and does not change.Therefore, piping is easy and there is no possibility of incorrect piping or installation mistakes.

(Example) Embodiments of the present invention will be described below based on the drawings.

1 to 3 are diagrams showing a first embodiment of a polygonal tube according to claim 1 of the present invention. In FIG. 1, 11 is a hexagonal tube (hereinafter simply referred to as tube 11). 11 is a tubular body made of fluororesin (FEP resin) and having a regular hexagonal cross section.

In order to manufacture such a fluororesin tube with a regular hexagonal cross section, a commonly used manufacturing device for tube molding is used, and the gel-like resin extruded from the resin passage hole between the die and the nipple in the extrusion head is cut into a cross section. After forming it into a hexagon with a regular hexagonal sizing die, it is sent to a water cooling tank and cooled by water cooling etc. to complete the product.

When using such a tube 11, for example,
As shown in the figure, the tube 11 is inserted into the opening of an internal hexagonal nipple 17 attached to an experimental apparatus 16, after inserting a tubular top 15, if necessary, inside its end 11a. The diameter of the end 17a of the nipple 17 can be reduced by an axial line (17c).

Then, the bag nut (1) attached to the tube 11 in advance
8 into the end 17a of the nipple 17. Since the corner 11b of the end 11a of the tube 11 fits into the corner 17b of the nipple 17, the tube 11
1 does not rotate, and the cap nut 18 is screwed into the end 17a of the nipple 17 to reduce the diameter of the end 17a. The tube 11 is connected to the end 17a of the nipple 17 and the top 1.
Tightening is fixed within 5 minutes. Therefore, the tube 11 will not be twisted or distorted, and will not cause failure during use.

Furthermore, since the hexagonal tube 11 is used, there is no need to make the cross-sectional shape of the tube hexagonal using an electric heating iron before the work.

Furthermore, since the tube 11 is made of fluororesin, it has excellent electrical insulation, chemical resistance, heat resistance, and weather resistance.

In the first embodiment described above, a case was explained in which one hexagonal tube is inserted into one hexagonal inner hole nipple, but in the present invention, a plurality of hexagonal tubes with different cross-sectional shapes, for example, hexagonal , rectangular or triangular tubes may be inserted into and connected to multiple nipples having inner holes of shapes corresponding to each tube shape.In this case, the tubes are inserted into nipples of corresponding shapes and fixed with cap nuts. Since only one tube is needed, the installation of a large number of tubes can be done easily and quickly, improving work efficiency.

Further, in the above embodiments, a hexagonal tube with a regular hexagonal cross section was explained, but in the present invention, the cross section of the tube is square, rectangular, or regular as in the second to seventh embodiments shown in FIGS. 4 to 9. triangle, right isosceles triangle, right triangle,
It may be a polygon such as a trapezoid, and is the same as the first embodiment except for the above.

FIG. 10.11 is a diagram showing an embodiment of the focusing tube according to claim 2 of the present invention. In FIG. 10, 21 is a focusing tube, and the focusing tube 21 is made of fluororesin (
FEP resin), 14 regular hexagonal tubes 22 (hereinafter simply referred to as tubes 22) with a regular hexagonal cross section, and mutually adjacent tubes 22A and 22. As shown in FIG. 11, the wall surfaces 22a on each side of the walls 22a are arranged to face each other, and the bundles are arranged in close contact with no gaps, and a metal band-shaped tape 23, which is a focusing member, is placed around the center line along the axis C of the focusing tube 21.
It is slanted and wrapped in a spiral shape to surround it.

Further, the metal tape 23 has a polygonal cross section that connects the side wall 22b of the tube 22 located at the peripheral end of the focusing tube 21 and the corner 22c of the tube 22.

When the focusing tube 21 is used for transporting fluid, the focusing tube 21 is arranged so that the tube 22 is in close contact with the surrounding wall surface 22'a without any gaps, so there are no unnecessary gaps and the transportation efficiency is equal. Compared to a circular tube with a cross-sectional area, it is better in terms of the gap, and also has better space efficiency when piping within a certain space. Furthermore, when the focusing tube 21 is used as a heat exchange tube, the wall surface 22a of the tube 22m of the focusing tube 21 is in surface contact with the wall surface 22a of the adjacent tube 228, so that, like a conventional tube with a circular cross section, Compared to the case of contact by point or small contact area IC, the heat exchange efficiency is significantly increased.

Further, the focusing tube 21 is a tube 2 having a regular hexagonal cross section.
2 are bundled together, the position of each tube 22 will not shift due to bending or vibration of the focusing tube 21. Furthermore, since the cross-sectional shape of the metal tape 23 is polygonal, the attachment position will not twist or rotate after the focusing tube 21 is attached to the attachment port of the device.
The position of each tube 22 is constant, so there is no possibility of incorrect piping or installation mistakes. Therefore, piping and installation work becomes easy and quick, increasing work efficiency.

(Effects) As explained above, according to claim 1 of the present invention, when a polygonal tube made of fluororesin is attached to the installation port of a device, problems such as twisting of the tube can be prevented, and a large number of tubes can be Piping can be done easily and quickly without causing incorrect piping.

Furthermore, according to claim 2 of the present invention, the fluid transport efficiency can be increased, the heat exchange efficiency can also be increased, and the space utilization rate can be significantly improved. In addition, the tube piping and installation work during use can be done easily and quickly, and work efficiency can be greatly improved.

[Brief explanation of drawings]

1 to 3 are diagrams showing a first embodiment of a polygonal tube according to claim 1 of the present invention, in which FIG. 1 is a perspective view thereof, FIG. 2 is a perspective view showing its operation, and FIG. The figure is a partial sectional view showing the effect. 4 to 9 are sectional views showing second to seventh embodiments of the polygonal tube according to the present invention, respectively. 10 and 11 are views showing a focusing tube according to claim 2 of the present invention, FIG. 10 is a perspective schematic view thereof, and FIG. 11 is an enlarged schematic view of the main part thereof. FIG. 12 is a perspective view of a conventional tube, and FIG. 13 is a schematic perspective view of a focusing tube in which conventional tubes are bundled. 11...Hexagonal tube (polygonal tube),
11a... end, 11b... corner, 21... focusing tube, 22.22A, 22. ...regular hexagonal tube (polygonal tube), 23...metal tape (focusing member).

Claims (2)

[Claims] (1) A polygonal tube made of fluororesin and characterized by having a tubular shape with a polygonal cross section. (2) A focusing tube characterized in that a plurality of tubular polygonal tubes made of fluororesin and having a regular polygonal cross section are arranged so that the wall surfaces of the tubes face each other and are in close contact with each other, and the bundled periphery is surrounded by a focusing member.