JPS608400B2 - How to connect insulation pipes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for connecting heat insulating pipes, particularly heat insulating pipes used for air conditioning, heating, hot water, etc.

This type of heat insulating pipe is made by preparing a metal pipe such as a steel pipe, covering the outer periphery of the metal pipe at a predetermined interval with a jacket pipe made of synthetic resin, and connecting these metal pipes and the jacket pipe. A heat insulating layer is formed by filling and foaming a foamable synthetic resin in between.

Therefore, when connecting this type of heat insulating pipe, the heat insulating layer and the jacket pipe are separated from the metal pipe, the metal pipe is exposed, and the exposed metal pipes are welded together. They were covered with glass fiber, wood wool, asbestos, shrinkable thermoplastic resin foam sheets, etc., wrapped in a spiral shape.

This method requires a large number of steps, a long working time, and requires extremely high skill considering the narrow working space. The present invention has been made in view of the above-mentioned circumstances, and it is an object of the present invention to provide a method for connecting heat-insulating pipes that is simple and easy and has an excellent heat-insulating effect after connection.

This invention involves disposing an outer sheath made of synthetic resin to cover the outer periphery of metal pipes such as steel pipes at predetermined intervals, and filling and foaming a foamable synthetic resin between these metal pipes and the outer pipe. A method for connecting heat insulating pipes with a heat insulating layer formed thereon, comprising: exposing a metal pipe; connecting the metal pipes together via a connecting pipe; and covering the connecting pipe with a heat insulating layer and a jacket pipe. the step of forming a step on the end of the heat insulating layer, the step of processing a connecting heat insulating tube that covers the exposed metal pipe, and the step of adhesively bonding the connecting heat insulating tube to the metal tube. It is a feature.

Here, the step of exposing the metal tubes is a step of exposing the metal tubes by removing and separating a predetermined length of the jacket and the heat insulating layer from the connection end of each of the heat-insulating tubes to be connected. The predetermined length at this time is determined in consideration of the fact that the metal tube portions will not be affected by heat during connection, for example brazing connection. Further, the subsequent step of connecting metal tubes via a connecting tube is a step of connecting the exposed ends of the metal tubes with each other using a connecting tube.

The connecting tube is usually made of the same quality as the metal tube, and the twilled Z bowl can be made by any known connecting means such as welding or brazing. Furthermore, the step of covering the connecting pipe with a heat insulating layer and an outer covering is a step of covering the connecting pipe with a heat insulating layer and outer pipe having the same diameter and the same quality as the heat insulating layer of the metal pipe prepared in advance on the connecting pipe. be.

In this step, a cylindrical body consisting of a heat insulating layer of the same diameter and quality as the heat insulating layer of the metal pipe and a jacket tube is attached to the connecting pipe which is divided into two halves, and is fixed with adhesive. Furthermore, the step 2 of step-processing the ends of the heat-insulating layer is a step of performing step-processing on the ends of each heat-insulating layer that is connected via the exposed metal pipe.

This step-up processing step is not limited to the next step, but it is sufficient that each step-up is formed at any point in time. The cylindrical body consisting of the heat insulating layer and the jacket tube which is covered with the connecting pipe 2 may be stepped at both ends before being plugged. Furthermore, ``The process of processing a connecting insulation tube that covers an exposed metal pipe refers to a connecting insulation tube made of a heat insulating layer including a jacket tube extracted from a metal pipe, or both ends of the insulation layer of a similar type of connecting insulation tube. In this step, the step shape formed in the step step is subjected to a step step process in which iron is interlocked, and the step is divided into two.

This cylinder may be completely divided into two parts, or it may be partly divided into two parts connected by a jacket tube. and,
The process of adhesively bonding the connecting heat insulating cylinder to the metal pipe is a process of adhesively bonding the connecting heat insulating cylinder processed in the above process to each part of the exposed metal tube via an adhesive.

An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an example of a heat insulating pipe to which the present invention is applied.

That is, this metal tube A has metal tubes 2 made of synthetic resin disposed so as to cover the outer periphery of metal tubes 1 such as steel tubes at predetermined intervals, and foamed metal tubes 2 made of synthetic resin are disposed between these metal tubes 1 and the jacket tube 2. The heat insulating layer 3 is formed by filling and foaming a synthetic resin. In one embodiment of the present invention, the heat insulating pipes A thus formed are connected as follows.

First, as shown in Fig. 2, the end of each connection side of each heat-insulating pipe A is heated over a length that will not be affected by heat during the brazing connection of the metal pipe section, which will be described later. By separating and extracting the jacket tube 2 and the heat insulating layer 3, the metal tube 1 is partially exposed from the heat insulating support A.

And the heat insulating layer 3 including the outer sheathing 2 removed at this time
This member, that is, the member that forms the heat insulating cylinder by itself, will be utilized as the connecting heat insulating cylinder B, as will be described later. In addition, as shown in Fig. 3, the heat insulating pipe A with a part of the metal pipe 1 exposed is covered with a synthetic resin jacket tube that matches the pipe diameter of the heat insulating pipe A from the exposed end of the metal pipe, as shown in Fig. 3. Insert the connection ring C and connection pipe cover D. The above-mentioned outer tube connection rings C, C and connecting tube cover D are not necessarily necessary for the present invention, but they can reinforce the connecting portion of the outer tube in the subsequent process, so they are provided as described above. This is desirable.

Then, after being prepared in this way, each exposed metal tube 1, 1 of each insulated tube A, A is connected between each tube end, for example by a so-called elbow in this case, as shown in FIG. The metal tubes 1 and 1 are connected by a connecting tube E made of the same quality as the metal tubes 1 and 1, and are usually connected by brazing.

At this time, since the heat insulating layers 3 and 3 are removed from both the metal tubes 1 and 1 for a sufficient length, the heat insulating layers 3 and 3 are not affected by the welding heat during the connection, and therefore the heat insulating layer The layer 3 or the jacket tube 2 will not collapse or deform. Furthermore, it goes without saying that this connecting pipe may be of any shape, such as a straight pipe or a tooth shape, in addition to the elbow shape. Next, as shown in FIG. 5, the heat insulating layer 3 is placed on the connecting pipe E.
Correspondingly, a heat insulating layer F, which has been previously formed and prepared so as to match the shape of the tube E and have the same diameter and quality as the heat insulating layer 3, is covered.

(d) This heat insulating layer F is divided into two parts with a step 4 formed at each end, and after being covered with the above-mentioned droplet connecting pipe E, the above-mentioned connecting pipe cover D is inserted and prepared in advance. It is advisable to cover the steps 4 and 4, and to temporarily fold back the stepped portions 4 and 4 as shown in the same figure. Furthermore, the insulation layers 3, 3 of the insulation pipes A, A corresponding to the insulation layer F' are also provided with tiers 5, 5 corresponding to the tiers 4, 4 at their ends.
Process.

Processing and forming of each of these steps 4 and 5 does not necessarily have to follow the above-described procedure, and the point is that each step may be formed at any point in time. Furthermore, as shown in FIG. 6, the connecting heat insulating tube B (which may be prepared separately) is divided into two halves with a part covered by the jacket tube 2, and both ends thereof are are steps 6 and 7 that match the shapes of steps 4 and 5 above.
After that, as shown schematically in FIG. Between each of the jacket tubes 2, 2 of the heat insulation tube B and the heat insulation tube A, the jacket tube connection ring C is similarly covered with adhesive, and between the connection heat insulation tube B and the heat insulation layer F, Then, the folded portion of the connecting pipe cover D is returned to its original position around a part of the jacket pipe 2 of the connecting heat insulating cylinder B, and the parts are similarly coated with adhesive and bonded to each other.

The form after connection obtained in this way is shown in FIG. In the above embodiment, the connecting heat insulating cylinder B and the heat insulating layer F are separated, but for example, as shown in FIG. Needless to say, it is possible to integrally form a straight pipe portion corresponding to , and to provide the ends thereof with steps that match the shape of the steps 5, 5.

Therefore, when using the connection method of the present invention, which is performed as described above, it is possible to effectively connect the insulated pipes to each other by an extremely rational and simple method, and this type of connection method, which was previously difficult to perform on-site, is possible. This method has the advantage that the connection of heat-insulating pipes can be carried out without requiring any skill.

[Brief explanation of drawings]

1 to 7 are process diagrams showing one embodiment of the connection method according to the present invention, and FIG. 8 is a side sectional view of the main part showing a modification of the heat insulating layer F. A...Insulated pipe, B...Connected insulated tube, C...
...Envelope pipe connection ring, D...Connection pipe cover, E.
...Connecting pipe, F...Heat insulation layer, 1...Metal pipe,
2... External tube, 3... Heat insulation layer, 4, 6 and 6
,7......Stepping. Game Zukyu 2 Figure 3 88 Sam Figure Game 5 Figure 6 Figure 6 "Figure The 8 Figure

Claims (1)

[Claims] 1. A jacket tube made of synthetic resin is installed to cover the outer periphery of a metal pipe such as a copper pipe at a predetermined interval, and a foamable synthetic resin is filled and foamed between these metal tubes and the jacket tube. A method for connecting heat insulating pipes having a heat insulating layer formed thereon, wherein the metal tube is separated by removing a predetermined length of the jacket tube and the heat insulating layer from the connection end of each of the heat insulating pipes to be connected. a step of exposing the exposed metal pipes, a step of connecting the ends of the exposed metal tubes with a connecting pipe, and a heat insulating layer and an outer covering having the same diameter and the same quality as the heat insulating layer prepared in advance on the connecting pipe portion. a step of covering the tube; a step of step-processing the ends of each of the heat insulating layers facing each other through the exposed metal tube; and a connecting heat insulating tube made of the heat insulating layer including the extracted jacket tube. , or a step of applying a step process to both ends of the heat insulating layer of the same type of connected heat insulating tube to fit the stepped shape of the end of the heat insulating layer and dividing it into two; A method for connecting heat insulating pipes, comprising the step of adhesively bonding the connecting heat insulating cylinder to each part via a connecting agent.