JPH0533895A - Cap - Google Patents

Abstract

PURPOSE:To improve work efficiency by providing a jet part, by which flowing fluid can be jetted from inside a pipe body, in a diametric direction or another end side direction in a condition covered in one end of the pipe body, in the case of a cap for an air condition piping heat insulating pipe. CONSTITUTION:A heat insulating pipe is formed by externally fitting a coating pipe 2 while blowing in air, by covering a cap 3 in one end 1a and by mounting an air nozzle to the other end 1b, of a heating medium transporting copper pipe 1 for warm water or the like. In this cap 3, a jet part 7 comprising groove parts 7a, 7b is formed so that air fed to a side of the one end 1a from the other end 1b is blown out in a direction of the other end 1b along a peripheral surface 6 of the copper pipe 1 from the one end 1a. The groove part 7a is formed by a pair opposed parallelly to an axis in an internal peripheral part of the cap 3, and the groove part 7b is formed so as to be continued to the groove part 7a in an internal surface of a bottom part 3b of the cap 3. Since a contact surface 8 is brought into contact with an internal part of the coating pipe 2 to prevent air from escaping, the internal part of the coating pipe 2 can be cleaned by forming an air layer behind a direction of inserting the cap 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cap for covering one end of a tubular body, and more specifically, for protecting one end of the tubular body against contact with another object and covering the one end of the tubular body with For example, the present invention relates to a cap used for manufacturing a heat insulating pipe by inserting one end of a tubular body from one end toward the other end of a flexible covering cylinder for air conditioning pipe made of a heat insulating material.

[0002]

2. Description of the Related Art Conventionally, a cap of this type is formed by covering one end of a tubular body so that one end of the tubular body is in a closed state, which is one example of its use in manufacturing a heat insulating pipe. hand,
It is used as follows.

Generally, in the production of heat-insulating pipes, the tubular body is produced in a factory and is wound in the longitudinal direction in a long state, or is cut into a fixed length from the beginning. Insert from one end. At that time, since the end of the pipe is a sharp cut, there is a risk of cutting hands when working and scratching the inner peripheral surface of the inserted coated cylinder. In addition, one end of the tubular body was covered with the cap.

On the other hand, when the tubular body is inserted, the frictional resistance between the peripheral surface of the tubular body and the inner surface of the covering cylinder becomes large and it becomes difficult to insert it. Therefore, in order to reduce this frictional resistance, the following method is used. Was taking.

First, a method is used in which one end of the tubular body is covered with a cap so as to be in a closed state, and then an air nozzle is attached to the other end of the covering cylinder and air is blown toward one end of the covering cylinder from there. It was That is, the air blown from the other end of the covering cylinder travels through the covering cylinder, and from the space between the cap covered on the tip of the inserting tube and the inner surface of the covering cylinder, And the inner surface of the covering cylinder to form an air layer and exit from the insertion opening. The air layer between the peripheral surface of the tubular body and the inner surface of the coated cylinder serves to reduce the frictional resistance between the tubular body and the coated cylinder to assist the insertion of the tubular body. As described above, the conventional cap has been used to close one end of the tubular body.

[0006]

The steps of the conventional heat insulating pipe manufacturing method using the cap described above will be described below. <1> The cap is attached to one end of the tubular body which is an insertion end, and then the tubular body is inserted into one end of the covering cylinder. <2> An air nozzle is attached to the other end of the covering cylinder to blow air. <3> When the insertion for the predetermined length is completed, the air is stopped and the air nozzle is removed from the covering cylinder. <4> In order to insert the next tubular body into another covered cylinder, another cap is fitted to one end of the tubular body, and the above-mentioned operation is repeated again.

That is, if the conventional cap is used, it is inevitable to perform the procedure as described above.

However, such a conventional method for manufacturing a heat insulating pipe has a drawback that not only a large number of personnel are required because the work is performed at positions separated from both ends of the covering cylinder, but also work efficiency is poor.

Further, since the covering cylinder has low pressure resistance, in the air feeding work step of <2>, the covering cylinder is sent into a semi-closed space extending from the other end to the one end side of the covering cylinder into which air is blown. There is a risk of bursting due to an increase in air pressure, and in order to prevent this, the air to be sent must be frequently managed, which results in an increase in the amount of work and a decrease in work efficiency.

In view of the above-mentioned drawbacks, an object of the present invention is to provide a cap which can realize speedy work in the production of a heat insulating pipe without risk of rupture of the covering cylinder.

[0011]

A first characteristic feature of the cap of the present invention for achieving this object is to cover the one end of the tubular body in the radial direction or in the other end side direction of the tubular body. In the second characteristic configuration, the fluid sent from the tubular body is provided from the other end side of the tubular body. There is a front ejection hole at the tip end portion that can eject toward the one end side.

[0012]

According to the above characteristic construction, the cap is inserted into one end of the pipe body to be inserted into the covering cylinder, and air is blown toward the one end side from the other end of the pipe body so that the pipe is inserted from the cap. In order to adopt a method of relatively inserting the pipe body toward the other end of the covering cylinder while blowing air between the body and the covering cylinder, the air nozzle is attached to the covering cylinder. Since it can be performed at the base end on the opposite side of the insertion end of the pipe body to be inserted into the pipe, and the person who performs the insertion of the pipe body can also serve as the attachment of the air nozzle, the cover cylinder as in the conventional case. It is not necessary to arrange personnel at one end opposite to the insertion port of the.

Further, the present invention is not limited to the use of closing the tip of the tubular body as in the conventional cap, and the air sent into the tubular body is passed through this cap between the tubular body and the covering cylinder. Since it is formed so that it can be positively blown out in the direction opposite to the insertion direction, it also exerts a sufficient function to reduce the frictional resistance between the tubular body and the coated cylinder without worrying about the bursting of the coated cylinder due to air pressure. In addition to being able to do so, the management for supplying air becomes easy. Further, after inserting the tubular body into the covering cylinder, if the cap is not removed from the tubular body after the heat insulating tube is manufactured, it can be used as a dust guard for the tubular body.

On the other hand, according to the second characteristic configuration, since the front ejection hole is provided in the cap so that the air can be ejected also toward the insertion direction side of the pipe body, by ejecting the air forward in the insertion direction, The inside of the cover tube in front of the cap can be cleaned with air, and insertion can be performed speedily.

[0015]

Therefore, according to the cap of the present invention, it is possible to easily manufacture the heat insulating pipe with a small number of personnel, and it is possible to improve the working efficiency and the economical efficiency while reducing the working amount as a whole. .

[0016]

Embodiments of the present invention will be described below with reference to the drawings. The heat insulation pipe is a copper pipe 1 for transporting a heat medium, and the copper pipe 1
It is formed by a covering cylinder 2 for heat insulation of the copper tube 1 by externally fitting. FIG. 1 shows a cross section along the longitudinal direction of the covering cylinder 2 as a diagram showing the process of the method for manufacturing the heat insulating pipe. A specific method for manufacturing a heat insulating pipe is performed in the following order. <1> A cap 3 is placed on one end 1a of the copper tube 1. <2> An air nozzle (not shown) on the other end 1b of the copper tube 1.
Attached to the one end 2a of the covering cylinder 2 while blowing air
Insert the copper tube 1 from. <3> When the copper tube 1 has been inserted up to the other end 2b of the covering cylinder 2 cut to a fixed length, the air is stopped and the copper tube 1 is cut near the one end 2a of the covering cylinder 2 for another covering. The cap 3 is attached to the cut end 1a 'of the copper tube 1 to be inserted into the tube 2', and the above-described operation is repeated again.

Next, each structure will be described. First, the copper pipe 1 is used for transporting a heat medium such as CFC gas, hot water, cold water, etc. to an air conditioner, and is wound along the longitudinal direction. The one in the cut state or the one cut in a predetermined length is inserted into the covering cylinder 2.

The covering cylinder 2 is formed in a cylindrical shape having an inner diameter slightly larger than the outer diameter of the copper tube 1 so as to be fitted onto the copper tube 1 with a gap 4 through which the air can flow, as described above. For each, a standard size is prepared depending on the application. The material is formed of, for example, foamed flexible polyethylene foam, and the built-in bubbles are formed of closed cells, so that the heat insulating effect is high. Further, the outer surface thereof is covered with an outer cover 5 made of an uneven resin sheet for protecting the heat insulating pipe.

When the air is sent from the other end 1b of the copper tube 1 to the one end 1a side while being covered with the one end 1a of the copper tube 1, the air is a side edge of the one end 1a of the copper tube 1. A groove 7 is formed on the inner surface of the cap 3 so as to blow out in the direction of the other end 1b along the outer peripheral surface 6 of the copper tube 1. As shown in FIGS. 2 and 3, the groove portions 7a are formed on the inner peripheral portion 3a of the cap 3 in a shape along the axial direction, and a pair of groove portions 7a are provided at opposing positions, and further on the inner surface of the bottom portion 3b of the cap 3. A groove portion 7b is provided so as to be continuous with the groove portion 7a. Therefore, the air blown into the copper tube 1 passes through the groove portion 7 of the cap 3 and is blown out toward the other end 1b at the outer peripheral surface 6 of the copper tube 1 to form a gap between the outer peripheral surface 6 of the copper tube 1 and the inner peripheral surface of the covering cylinder 2. An air layer is formed on 4. In the air layer, the outer diameter of the cap 3 is made substantially equal to the inner diameter of the covering cylinder 2, so that air does not escape to the contact surface 8 thereof, so that the rear end in the insertion direction is mainly from the cap 3 portion inside the covering cylinder 2. It is formed to the side. Further, a contact portion 3a is provided on the inner peripheral surface of the cap, which can exhibit frictional resistance by contacting the outer peripheral surface 6 of the copper tube 1 so that the cap 3 does not easily come off from the copper tube 1 when air is blown out. is there. When a long copper tube is used, the number of times the air nozzle is replaced with the other end of the copper tube can be reduced by fitting the copper tube into the covering tube while unfolding, which has the advantage of further improving work efficiency. Occurs. By the way, the metal pipes such as the copper pipe and brass are collectively referred to as a tubular body.

[Other Embodiment] Another embodiment will be described below. <1> As for the cap 3, the cap shown in FIG. 4 can be used as an example. First, the number of the grooves 7 is not limited to two, and if the air blown into the copper tube 1 is formed so as to be guided to the other end 1b side of the outer peripheral surface 6 of the copper tube 1 and blown out. good. Therefore, as shown in the figure, there may be four locations in the circumferential direction, and the shape is not limited to the square groove, but may be a round groove. Further, if the convex portion 10 that is continuous in the circumferential direction is provided on the outer peripheral surface of the cap 3, the air blown out from the groove 7 will come from the contact surface 8 between the outer peripheral surface of the cap 3 and the inner peripheral surface of the covering cylinder 2. Since it can be prevented from leaking forward in the insertion direction, air loss is reduced and a more reliable air layer can be formed in the gap 4 between the copper tube 1 and the covering tube 2. Furthermore,
If the front ejection hole 9 penetrating in the axial direction is provided in the bottom portion 3b, a part of the air blows out through the front ejection hole 9 toward the front in the insertion direction to clean the inside of the covering cylinder 2 and smooth the copper tube 1. Easier to insert into.

<2> Next, the covering cylinder 2 may be a long one instead of the standard length, and a method of cutting the covering cylinder 2 each time after inserting a copper pipe may be adopted. The following methods can be considered as the insertion method. That is, in addition to the method of advancing the copper tube 1 into the coated tube 2, the method of advancing the coated tube 2 with respect to the copper tube 1 and the method of simultaneously moving the copper tube 1 and the coated tube 2 in opposite directions There is a way to insert each other.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a diagram showing a process of a method for manufacturing an insulating piping material.

FIG. 2 is a perspective view of a cap.

FIG. 3 is a diagram showing a cross section of a cap.

FIG. 4 is a view showing a cap of another embodiment.

[Explanation of symbols]

1 tube 1a One end of tube 1b The other end of the tube 7 spout 9 Front spout hole

Claims (2)

[Claims] 1. A cap for covering one end (1a) of a tubular body (1), wherein the cap is fitted over one end (1a) of the tubular body (1) in the radial direction or the other direction of the tubular body (1). A cap provided with a jet portion (7) capable of jetting fluid sent from the inside of the tubular body (1) toward the end (1b) side direction. 2. A front ejection hole (9) capable of ejecting a fluid sent from the inside of the tubular body (1) from the other end (1b) side of the tubular body (1) toward the one end (1a) side, The cap according to claim 1, wherein the cap is provided at a tip portion.