KR100623391B1 - How to manufacture double pipe and double pipe joint member - Google Patents

Abstract

The present invention is a double pipe filled with a heat insulating material between the inner tube and the outer tube, one side of the inner tube is protruding than the outer tube is formed at the end of each outer circumferential surface, the other side of the outer tube protrudes from the inner tube but each inner peripheral surface end A double pipe having a female thread formed thereon so that opposite sides corresponding to each other when the two double pipes are connected are easily screwed together; Double pipe joint members such as elbows, T branches, crosses, sockets, bands, unions, and nipples used for the pipes of the double pipes; It relates to a manufacturing method of the double pipe and double pipe joint member.

Double pipe, double pipe joint member, inner pipe, exterior, insulation, piping

Description

Double pipe and double pipe joint member manufacturing method {omitted}

1 is a cross-sectional view of a double pipe according to the present invention

2 is a cross-sectional view showing a state in which the stopper 1 and the stopper 2 are fitted in the manufacturing method of the double pipe of the present invention.

Figure 3 is a cross-sectional view of the 'T' type double pipe joint member according to the present invention

Figure 4 is a cross-sectional view showing a state in which the plug 1 and the plug 2 in the 'T' type double pipe joint manufacturing method according to the invention

5 is an exploded perspective view of an inner pipe joint member, an outer joint member piece, and a stopper in the 'T' type double pipe joint member manufacturing method according to the present invention;

<Description of the code | symbol about the principal part of drawing>

10: inner tube 20: appearance

30: heat insulating material 40: female thread

50: external thread 60: stopper 1

70: stopper 2 80: injection hole

90: inner joint member 100: outer joint member

110: external joint member piece

The present invention relates to a double pipe and a double pipe joint member filled with a heat insulating material between the inner tube and the exterior and a manufacturing method thereof.

Pipes are mainly used for transporting fluids (gas and liquid) or powders. It is also applied to the protection of electric wires and cables when wiring in the ground or indoors. A passage of a fluid constituted by a pipe is called a pipe, and a pipe is reasonably installed in consideration of the flow rate, physical property value, friction resistance, and the like of the fluid.

Long pipes use pipe couplings to change the direction of the pipe along the way, or to join pipes with pipes of different thicknesses. In addition, since pipes are stronger against bending than rods of the same weight, they are widely used as constituent materials for machines and structures.

Pipes are divided into metal pipes and non-metal pipes according to their materials. Metal pipes include steel pipes, cast iron pipes, copper pipes, brass pipes, aluminum pipes, pipes, etc., and non-metal pipes include vinyl pipes, reinforced concrete pipes, and asbestos. There are cement pipes, conduits, pipes, rubber pipes, and wooden pipes.

Pipe joints are a combination of pipes and pipes, which are permanently bonded and decomposedly bonded.

There are two types of permanent joints: welded joints and soldered joints, which do not leak fluid and save maintenance and equipment costs.

Decompositional coupling is used when a line breaks and must be dismantled. (1) Flange Couplings: Flange couplings, bolted together, screw coupling, voltage flange, rivet flange, welding flange, soldering flange, etc. (2) Threaded pipe joints: Dig a pipe screw at the end of the pipe and join using elbows, T, branch, cross, socket, band, union, and nipple. (3) Expansion joints, which are used in places with large temperature differences, include rubber joints, waveform joints, sliding joints, and band joints. (4) Socket insert joints, also known as faucet joints, using the flexibility of pipes. Create and join the receiving jaw (or agar). Since there is no corrosion of bolts, it is mainly used to connect underground plumbing pipes such as water and sewage and gas.

Polyurethane is a generic term for a high molecular compound bonded by a urethane bond. A urethane bond is formed by a combination of an alcohol group (base) OH and an isocyanic acid group NCO. It is elastic fiber spandex that is made of synthetic fiber. It can be said to be the middle of Perlon U and urethane rubber.

Urethane-based synthetic rubbers include polyester and polyether. The polyester system is made of polyester by reacting propylene glycol and ethylene glycol with adipic acid, and having a molecular weight up to 3,000 with OH groups at both ends of the urethane with naphthalene-1, 5-diisocyanoic acid and polymer. In addition, the polyether is mixed with ethylene oxide with some ethylene oxide first to be polyether, and the OH groups at both ends are reacted with toluylene diisocyanic acid to make a high molecular weight polyurethane. Ozone resistance and abrasion resistance are made of synthetic rubber, and automobile tires are also made. Bedding mattresses used at home are also made of urethane foam containing bubbles in polyether-based polyurethane.

Polyurethane foam is a porous product made of polyurethane, which is composed of polyurethane obtained by the reaction of isocyanate compound and glycol as a constituent material, and water to be used as constituent isocyanate and bridge binder. It refers to a foamed product made by mixing a volatile solvent such as carbon dioxide and freon produced by the reaction with a blowing agent. The bulk density of the foam can be controlled relatively freely and can be simply foamed anywhere on site. Depending on the type of raw glycol used, it can be divided into polyether foam and polyester foam. The former is flexible and the latter is suitable for use as an industrial foam. Therefore, the foam made in this way has a variety of firmness, such as ultra-soft (soft), soft, semi-hard (半 硬 質), hard.

Super soft and soft foams are used for futons and mattresses because of their excellent cushioning properties, and rigid foams are used for refrigerator insulation because of their rigidity and good thermal and low temperature properties. It has good shock absorbing power and is used as automobile interior material. There are two foam forming methods, one-shot method and prepolymer process. The one-shot method is economical because the raw materials are mixed and foamed by reacting all at once, so that the flexible foam is mostly made by this method. The prepolymer method is a method in which a part of glycol is reacted with diisocyanate to make a prepolymer (partial polymerizer), and then the remaining glycol, foaming agent, and catalyst are mixed and foamed. This method is used to create high quality foams for industrial use.

The double pipe is a double heat pipe (double pipe) used in a piping system as a guide member for filling an insulator between an inner pipe and an outer pipe to transfer an amorphous fluid such as water, hot water, steam, or oil. These pipes are roughly classified into steel pipes, copper pipes, cast iron pipes, and resin (plastic) pipes according to their materials. Steel pipes are mainly used to transfer high-temperature fluids, and copper pipes, cast iron pipes, and resin pipes are used depending on the temperature range of the object to be transferred. . In particular, when transferring fluids sensitive to temperature changes such as cold water, hot water, steam, oil, etc., it is necessary to use pipes made of excellent materials such as rust prevention, anticorrosion, thermal insulation, and cold storage to increase durability and preserve the physical properties of the fluid to be transferred. have.

In particular, in the case of a double insulation tube consisting of two tubes, an inner tube and an outer tube, foam insulation of a hard polyurethane material is filled between the inner tube and the outer tube to improve the thermal insulation, that is, the heat insulation.

However, in the conventional double pipe, the technology of the double pipe and the double pipe joint member having a simple connection structure is overlooked, and in reality, it is practically difficult to pipe using the double pipe in the industrial field.

Therefore, the present invention is a double pipe joint member that is simply connected to the double pipe and the double pipe is easily connected between the double pipe and the double pipe filled with a heat insulating material between the inner tube and the exterior and serves to change or branch the pipe and the like; An object of the present invention is to provide a manufacturing method.

Hereinafter, the configuration and operation of the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view of a double pipe according to the present invention, Figure 2 is a cross-sectional view showing a state in which the stopper 1 and the stopper 2 is fitted in the double pipe of the present invention. Figure 3 is a cross-sectional view of the 'T' type double pipe joint member according to the present invention, Figure 4 is a cross-sectional view showing a state where the plug 1 and the plug 2 in the 'T' type double pipe joint member manufacturing method according to the present invention. 5 is an exploded perspective view of an inner tube joint member, an outer joint member piece, and a stopper in the 'T' type double pipe joint member manufacturing method according to the present invention.

In the double pipe of the present invention, as shown in Figure 1, in the double pipe filled with a heat insulating material between the inner tube and the outer tube, one side of the double pipe is protruding from the inner tube than the outer tube but the male thread on the outer peripheral surface of the end of the inner tube and outer tube It is formed, the opposite end of the outer tube is protruding than the inner tube, the inner tube and the end of the outer end portion of the inner thread is formed is characterized in that the side corresponding to each other when the two double pipes are easily screwed together.

Referring to Figure 2, the method of manufacturing the double pipe as described above, after forming the inner thread and the female thread at both ends of the inner tube and the outer tube of the same length, respectively, the inner tube is inserted into the outer tube portion of the inner tube formed female thread Inserted in the same position as the externally formed external part, and the empty space opening between the externally formed inner thread and the inner tube is closed with a stopper 1 having a circular protrusion at the center, and the empty opening between the internally formed inner tube and the external thread is formed in the center. When closed with a stopper 2 in which a groove is formed, standing vertically upward, an inner tube is naturally located in the center of an exterior, and an empty space is formed between them. When the foaming solution is injected into the empty space through the injection hole formed in the upper stopper, the foaming is performed to fill the insulating part with the space.

As shown in FIG. 2, the plug 1 which blocks the opening between the outer tube and the inner tube having the female thread formed therein has a double ended protrusion formed at the center thereof, and the portion of the inner tube which is inserted into the inner circumferential surface of the outer female screw and the inner screw of the inner tube. Is a portion inserted into the inner circumferential surface is formed, the stopper 2 to block the opening between the external appearance and the inner tube is formed with a double end groove is formed in the central portion, the portion surrounding the outer circumferential surface on which the external thread is formed It is characterized by consisting of a portion surrounding the outer peripheral surface formed with a male screw of the inner tube, the shape of the stopper is a natural shape according to the double pipe production according to the present invention.

The double pipe joint member of the present invention is composed of an inner tube joint member and the outer joint member and the inner and outer joint member filled with the insulating material, the outer joint member of the fluid inlet protrudes a proper length than the inner tube joint member, the outer joint member and the inner tube A female thread is formed on the inner circumferential surface of the joint member so that the male threaded side of the double pipe is simply screwed on, and the inner pipe joint member of the fluid outlet port has a proper length than the outer joint member but a male thread is formed on the outer circumferential surfaces of the outer joint member and the inner pipe joint member. Is formed is characterized in that the female screw side of the double pipe is simply screwed.

In addition, as another embodiment of the double pipe joint member, the shape of the fluid inlet and the fluid outlet may be configured to be the opposite. That is, the outer joint member of the fluid outlet port has a proper length than the inner tube joint member, but female threads are formed on the inner circumferential surfaces of the outer joint member and the inner tube joint member so that the male thread of the double pipe is simply screwed, and the inner tube of the fluid inlet port is formed. The joint member has a proper length than the outer joint member but a male thread is formed on the outer circumferential surfaces of the outer joint member and the inner tube joint member so that the female thread of the double pipe is easily screwed.

The reason for the need for two types of double pipe fitting members as described above is that the fluid outlet of the double pipe and the fluid inlet of the double pipe are selected according to the case where the male thread is formed and the female thread is formed at the fluid outlet installed in the pipe to be piped. This is because the shape of the screw formed at the fluid inlet and the fluid outlet is determined by the male thread or the female thread. Of course, short pipes with female or male threads on both sides can be manufactured separately and used as connecting sockets.

The external joint member may be configured to combine at least two external joint member pieces to surround the outer circumferential surface of the inner tube joint member. In the outer joint member surrounding the outer circumferential surface of the inner tube joint member, by combining the outer circumferential surface of the inner tube using at least two pieces of outer joint member pieces to produce the outer joint member, the shape of the inner tube joint member is This is because it is impossible to insert the inner tube joint member into the integral outer joint member if complicated.

The inner pipe joint member may be any one of conventional joint members such as elbows, T, branches, crosses, sockets, bands, unions, and nipples used in threaded pipe joints. 3 is a cross-sectional view showing a 'T' type double pipe fitting member as an embodiment of the double pipe fitting member according to the present invention.

The female thread and the male thread of the external joint member may be formed in a state in which the external joint member piece is combined, but before joining, a part of a screw is formed on each external joint member piece before joining to form a complete female or male thread. You may.

The inner pipe joint member and the external joint member of the present invention are generally manufactured using a casting method in the case of a metal material, and may be manufactured using an injection molding method in the case of a synthetic resin material. Bolted coupling may be formed by forming a flange-shaped coupling portion in which bolt coupling holes are formed, which is a general technique that may be easily implemented by those skilled in the art.

The method of filling the insulating material between the inner pipe joint member and the outer pipe joint member is the same as the foaming and filling of the heat insulating material between the inner pipe and the outer pipe of the double pipe. That is, the openings between the inner pipe joint member and the external joint member may be closed with a stopper (stopper 1 and stopper 2), and the insulating material may be injected into the space to foam the molded article. 4 is a cross-sectional view showing a state in which a stopper is inserted in the manufacture of the 'T' type double pipe joint member as an embodiment of the double pipe joint member according to the present invention.

It is preferable to use polyurethane as the heat insulator, and the polyurethane has excellent bonding strength after the molding is completed, and the bonding state between the outer joint member and the inner tube joint member composed of two or more outer joint member pieces through the polyurethane is intact. This is because the expected action can be maintained.

Referring to Figures 4 and 5 presented a method of manufacturing a double pipe joint member of the present invention, by combining two or more outer joint member pieces to configure the outer joint member surrounding the outer peripheral surface of the inner pipe joint member, the appearance of the fluid inlet The joint member is configured to protrude a proper length than the inner pipe joint member, and conversely, the inner pipe joint member of the fluid outlet is configured to protrude a proper length than the external joint member; A female screw is formed on the inner circumferential surface of the end of the outer joint member and the inner pipe joint member of the fluid inlet, and a male screw is formed on the outer circumferential surfaces of the end of the outer joint member and the inner pipe joint member of the fluid outlet; The stopper 1 and the stopper 2 can block the opening of the empty space between the inner pipe joint member and the outer joint member, and then insulate the insulating material into the space to fill the foamed thermal insulating material.

In addition, it is a matter of course that the shape of the fluid outlet and the shape of the fluid inlet in the same manner can be produced in a shape opposite to each other to produce a different type of double pipe joint member.

In the process of piping using the double pipe and the double pipe joint member of the present invention, a shorter double pipe may be required, in which case, if the male thread is formed and the new male thread is formed on the outer peripheral surface thereof, You can simply get a short double pipe of the desired length.

Therefore, the double pipe and double pipe joint member of the present invention as described above is a very useful invention that is easy to manufacture, but excellent in heat insulation effect, in particular the piping work can be easily assembled in the field.

Claims (8)

delete delete delete delete delete After forming the male screw 50 and the female screw 40 at both ends of the inner tube 10 and the outer tube 20 of the same length, the inner tube 10 is inserted into the outer tube 20 and the inner tube 40 is formed. 10) The part is inserted in the same position as the part of the outer part 20 in which the female screw 40 is formed, and the opening of the empty space between the outer part 20 and the inner tube 10 in which the female screw 40 is formed is closed 1 (60). Closing the opening of the empty space between the inner tube 10 and the outer tube 20 in which the external thread 50 is formed with the stopper 2 (70), and then upright, and the upper part of the stopper 1 (60) and the stopper 2 (70) Double pipe manufacturing method characterized by filling the foam heat insulating material 30 by injecting a foaming solution into the empty space between the inner tube 10 and the exterior 20 through the injection hole 80 formed in the stopper. Combining two or more external joint member pieces 110 to configure the external joint member 100 to surround the outer circumferential surface of the inner tube joint member 90, the external joint member 100 of the fluid inlet to the inner tube joint member 90 A proper length is projected, and on the contrary, the inner pipe joint member 90 of the fluid outlet port is configured to project a proper length than the external joint member 100; A female screw 40 is formed on the inner circumferential surface of the outer joint member 100 and the inner pipe joint member 90 of the fluid inlet, and the outer circumferential surface of the outer joint member 100 and the inner pipe joint member 90 of the fluid outlet is formed. A male screw 50 is formed; Plug 1 (60) and stopper 2 (70) to close the opening of the empty space between the inner pipe joint member 90 and the external joint member 100, and then insulated 30 is injected into the space to foam insulation 30 Double pipe joint member manufacturing method characterized in that the filling. delete

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