JP3276426B2 - cap - Google Patents

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 particularly, to a cap for protecting one end of a tubular body against contact with another object and covering the one end of the tubular body. For example, the present invention relates to a cap used for manufacturing a heat insulating pipe by inserting one end of a pipe from one end to the other end side of a covering material for a flexible air conditioning pipe made of a heat insulating material. .

[0002]

2. Description of the Related Art Conventionally, a cap of this kind is placed on one end of a tubular body, and one end of the tubular body is hermetically closed.
It is formed into a simple inner and outer circumferential shape, and is used as follows in the production of a heat insulating material, which is an example of its use.

[0003] Generally, in order to manufacture an insulated tube, the tube body may be a long one produced in a factory and wound in the longitudinal direction, or a tube cut to a fixed size from the beginning. Insert from one end of the tube. At that time, since the end of the tube has a sharp cut, there is a risk of cutting hands by contact during work and damaging the inner peripheral surface of the sheathing tube into which the tube is inserted, In order to prevent this, one end of the tube was covered with the cap.

On the other hand, with the insertion of the tube, the frictional resistance between the outer peripheral surface of the tube and the inner surface of the coating tube becomes large and it becomes difficult to insert the tube. Therefore, in order to reduce this frictional resistance, the following method is used. Was taking.

First, one end of the tube is covered with a cap so as to be closed, and then an air nozzle is attached to the other end of the coating tube, and air is blown from there toward one end of the coating tube. there were.

That is, the air blown from the other end of the coating cylinder travels through the coating cylinder and is blocked by the front end face of the cap covered by the tip of the inserted tubular body. The pressure in the inner space of the coating cylinder increases to increase the diameter. Then, the insertion resistance is reduced by inserting the tube into the coating tube having the increased diameter.

As described above, the conventional cap is used to close one end of the tube.

[0008]

Here, the steps of the above-described conventional method of manufacturing a heat insulating pipe using a cap will be described in the following procedure. <1> The cap is fitted to one end serving as the tube insertion end, and then the tube is inserted into one end of the coating tube. <2> An air nozzle is attached to the other end of the coating 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 coating cylinder. <4> In order to insert the next tubular body into another coated cylinder, another cap is attached to one end of the tubular body, and the above operation is repeated again.

That is, if a conventional cap is used, it must be performed in the above-described procedure.

[0010] However, such a conventional method for manufacturing a heat-insulated pipe has disadvantages in that not only a large number of personnel are required but also work efficiency is low because the work is performed at positions separated at both ends of the coating tube.

Further, since the coating cylinder has a low pressure resistance, in the air supply operation step of <2>, the coating cylinder is sent to a semi-closed space extending from one end to the other end of the coating cylinder to which air is blown. There is a risk of explosion due to an increase in air pressure.To prevent this, it is necessary to frequently control the supply pressure of air supply air, resulting in an increase in work volume and a decrease in work efficiency. Become.

SUMMARY OF THE INVENTION An object of the present invention is to provide a cap capable of realizing a speedy operation without danger of rupture of a cladding tube in the production of a heat insulating tube in view of the above-mentioned drawbacks.

[0013]

A characteristic feature of the cap according to the present invention is that a fluid sent from the inside of the tube while being put on one end of the tube is ejected in a radial direction in which the fluid can be ejected in a radial direction of the tube. And a rotating body having a spiral continuous ridge formed on the outer peripheral surface is provided at the front end, and a rotation drive unit is integrally provided at the rear end side of the rotating shaft of the rotating body, The rotary drive unit is disposed in a fluid flow path formed in a state in which the cap is placed on the tubular body, and the operation and effect are as follows.

[0014]

According to the above-mentioned characteristic structure, a cap is inserted into one end of a tube to be inserted into the coating tube, and air is blown from the other end of the tube toward one end, so that the cap is inserted into the tube. In order to take a method of relatively inserting the pipe toward the other end of the coating cylinder while blowing air between the body and the coating cylinder, the air nozzle is attached to the coating cylinder. This can be performed at the base end opposite to the insertion end of the tubular body to be inserted into the cylinder, and the person performing the insertion of the tubular body can also serve to attach the air nozzle. There is no need to arrange personnel at one end of the cylinder opposite to the insertion opening.

[0015] Further, the present invention is not limited to the use of only closing the distal end of a tubular body as in a conventional cap. Because it is formed so that air can be positively blown out to the surrounding surface, there is no fear of bursting of the sheath by air pressure. Since a gap is formed between the pipe and the peripheral surface, the function of reducing the frictional resistance between the pipe and the coating cylinder can be sufficiently exhibited, and the management for air supply is also simplified. Further, a rotating direction for rotating a rotating body having a spiral continuous ridge provided at the tip of the cap to rotate in a propulsion direction,
When the rotation drive unit provided on the rear end side of the rotating shaft of the rotating body is made to coincide with the direction of rotation by the air blown from the air nozzle attached to one end side of the tube, the rotation is blown from the air nozzle. The rotation drive unit is rotated by the air that has been blown, and the rotating body is driven and rotated with the rotation. Try to promote.

That is, the air blown from the air nozzle is used not only to form a gap between the cap and the tube and the coating cylinder, but also to rotate the rotating body, thereby rotating the rotating body. It can be used to gain propulsion for inserting the tube.

After the tube is inserted into the coating tube,
If the cap is not removed from the tube after the production of the insulated tube, it can be used as a dust preventer in the tube.

[0018]

According to the above configuration, it is expected that the frictional resistance when inserting the tube is further reduced, and that the tip of the cap serves as a propulsion head, so that a thrust for inserting the tube is obtained. it can. Therefore, the heat insulating tube can be easily manufactured with a small number of personnel, and the work efficiency and the economic efficiency can be improved while the work amount can be reduced as a whole.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

The heat insulating tube is formed by a copper tube 1 for transporting a heat medium and a sheath tube 2 fitted around the copper tube for heat insulation of the copper tube.

The copper tube 1 is used for transporting a heat medium such as Freon gas, hot water, cold water, etc. to an air conditioner. The copper tube 1 is wound in a longitudinal direction or has a predetermined length. Is inserted into the coating tube 2.

The coating tube 2 is formed in a cylindrical shape having an inner diameter slightly larger than that of the copper tube 1 so as to fit on the copper tube 1 with a gap through which air sent from an air nozzle can flow. Regarding the dimensions, those of a fixed size are prepared depending on the application. The material is made of, for example, foamed flexible foamed polyethylene or the like, and the built-in cells are formed of closed cells, so that the heat insulating effect is high. Further, an outer skin 5 made of an uneven resin sheet is coated on the outer peripheral surface to protect the heat insulating tube.

When air is sent from the other end of the copper tube 1 to one end while the cap 12 is placed on one end of the copper tube 1, the air passes through the edge of one end of the copper tube 1, A hole 11 is formed on the peripheral wall of the cap so as to blow out toward the inner peripheral surface of the coating tube 2 fitted to the outside, and forms a radial jetting portion. As shown in FIG. 2, the hole 11 formed in the radial ejection portion is provided at a position on the outer peripheral surface of the cap 12 facing the radial direction.

The tip of the cap 12 is provided with a propulsion head 3 which is a rotating body having a helical continuous ridge 10 formed on the outer peripheral surface thereof. The propulsion head 3 is formed in a conical shape so that the tip becomes thin. The ridge 10 has rounded corners in order to avoid cutting the inner peripheral surface of the coating cylinder 2 by rotating. On the rear end side of the rotating shaft 6 of the propulsion head 3, blades 13 forming a rotation driving unit 7 rotatable by air are integrally connected. The rotation drive unit 7 connects the cap 12 to the copper tube 1.
And placed in the air flow path formed in the copper tube 1.

The blade 13 is attached to the rotating shaft 6 so that the propulsion head 3, which is the rotating body, rotates in a direction for moving forward when the rotation driving unit 7 receives air.

Therefore, as shown in FIG. 1, when air is blown into the copper tube 1 from an air nozzle (not shown), the blown air flows from the hole 11 of the radially spouting portion of the cap 12 into the inner periphery of the coating tube 2. Cap 12 blown out toward the surface
After an air layer is formed in a gap between the outer peripheral surface of the cap and the inner peripheral surface of the coating cylinder 2 and an air layer is formed between the outer peripheral surface of the cap 12 and the inner peripheral surface of the coating cylinder 2, The tip of the propulsion head 3 is blocked from flowing in the direction of insertion of the copper tube 1, flows in a direction opposite to the direction of insertion of the copper tube 1, and flows between the copper tube 1 and the inner peripheral surface of the coating tube 2. Form an air layer.

When the air passes through the copper tube 1, the rotation drive unit 7 arranged in the air flow path in the copper tube 1 is rotated. When the rotation drive unit 7 rotates, the coaxial propulsion head 3 rotates, and when the propulsion head 3 rotates, a propulsive force is generated in the insertion direction by the action of the spiral ridge 10 continuously formed on the outer peripheral surface. .

Further, the air is blown out from the hole 11 of the radial jetting portion, and air is formed between the cap 12 and the inner peripheral surface of the copper tube 1 and the coating tube 2, while the air is formed in the direction opposite to the insertion direction of the copper tube 1. It can be expected that the propulsive force will be generated by the air flowing through.

If the propulsion head 3 is formed to have a larger diameter than the portion around the radial ejection portion 11, only the maximum diameter portion of the propulsion head 3 comes into close contact with the inner surface of the coating cylinder 2, so that the frictional resistance is further reduced. Can be smaller.

FIG. 1 is a diagram showing a method of manufacturing a heat insulating tube.
3 shows a cross section along the longitudinal direction of the coating cylinder 2.

A specific method for manufacturing a heat insulating tube will be described below.

First, a cap 12 is put on one end of the copper tube 1. Next, an air nozzle (not shown) is provided at the other end of the copper tube 1.
The copper tube 1 is inserted from one end 2a of the coating tube 2 clamped and fixed by the clamping device while blowing air. When the insertion of the copper tube 1 to the other end 2b of the coated tube 2 cut into a fixed size is completed, the air is stopped, the copper tube 1 is cut near one end of the coated tube 2, and inserted into another coated tube. The cap 12 is fitted to the cut end of the copper pipe to be cut, and the above operation is repeated.

In this embodiment, as shown in FIG. 2, the number of holes is two at opposite positions. However, the number of holes is not limited to two. What is necessary is just to be formed so that it can be guided and blown out into the gap between the inner cylinder and the inner peripheral surface of the coating cylinder. Also, their shape and number are not limited.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the attached drawings.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a method of manufacturing a heat insulating tube.

FIG. 2 is a partial sectional view of a cap.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Copper tube 2 Coating cylinder 3 Propulsion head 7 Rotation drive part 11 Radial ejection hole

Claims (1)

(57) [Claims] 1. A cap to be placed on one end of a tube (1), wherein a fluid sent from the inside of the tube (1) in a state of being placed on one end of the tube (1) is a diameter of the tube. A rotating body (3) having a radial ejecting portion (11) capable of ejecting in the direction is provided, and a helical continuous ridge (10) formed on the outer peripheral surface is provided at the tip end portion. A rotation drive unit (7) is integrally connected to the rear end side of the rotation shaft (6) of 3), and the rotation drive unit (7) is provided in a fluid flow path formed in a state where the cap is placed on the tube (1). ) Placed cap.