JPH0636396Y2 - Telescopic tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to an exhaust pipe of a forced supply / exhaust type oil hot air heater, and particularly to a structure in which the length of the pipe can be adjusted.

<Prior art> Fig. 3 shows an example of a forced air supply / exhaust type oil hot air heater (hereinafter
It is called FF type oil warming. ) Shows the installation side view.

In FIG. 3, 100 is an FF type oil warm, and an exhaust port 102 and an air supply port 103 are provided on the rear surface 101 of the main body.
An exhaust pipe, commonly called an exhaust elbow, is installed at each air inlet.
4. The air supply hose 105 is connected, and these are connected to the exhaust pipe connection part and the air supply pipe connection part of the air supply / exhaust tube 106 having a double pipe structure. The supply / exhaust cylinder 106 is formed by penetrating a hole 201 in the wall 200 and takes in supply air from the outside and discharges combustion exhaust gas.

As the exhaust pipe 104, a pipe made of stainless steel is generally used only for passing the high temperature combustion exhaust gas.

On the other hand, in the FF type oil warming, the main body shape was large at the beginning of development, but recent products have been improved to be small and high performance. In other words, when trying to replace the old FF oil warming with a recent product, the wall for installing the supply / exhaust cylinder 20
The size from the position of the hole 201 of 0 to the exhaust port 102 on the back surface 101 of the main body of the FF type oil warming 100 is slightly different.

Generally, the exhaust pipe 104 of stainless steel pipe is available in various lengths so that it can be spliced when the length is insufficient, but there is a limit, and even a short one can not adjust the length of 15 cm or less. .

For this purpose, conventionally, an expandable pipe has been prepared as shown in FIG. That is, the two pipes 111 and 112 can be slid through the O-ring 110 for maintaining airtightness, and the length can be adjusted.

<Problems to be solved by the device> However, if the FF type oil warming is operated while the exhaust pipe connection part comes off and the combustion exhaust gas is released indoors, the combustion exhaust gas, especially carbon monoxide CO May be released and human life may be lost. For this reason, safety regulations are added and the exhaust pipe is required not to come off even if a load of 20 kg is applied, and the conventional expandable pipe shown in Fig. 4 may be used because the two pipes 111 and 112 may come off. It was difficult. The present invention is intended to provide a telescopic pipe that does not come off even when a load of 20 kg is applied.

<Means and Actions for Solving the Problems> In order to achieve this object, the telescopic pipe of the present invention has an angle fixed to each of the sliding inner pipe and the outer pipe, and a core rod is provided between the angles. , The inner rod and the outer pipe have the maximum length, and the core rod supports the angle between both angles to prevent the inner pipe and the outer pipe from coming off even if a load of 20 kg is applied. .

<Embodiment> An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an exhaust pipe according to an embodiment of the present invention. The section A is connected to the FF type oil warming exhaust port 102, and the section B is an exhaust pipe connecting portion of the supply / exhaust pipe 106 or an exhaust pipe for extension connection (not shown). In FIG. 1, the main part which can be expanded and contracted is shown in cross section.

FIG. 2 is a perspective view showing the respective parts constituting the main part.

In FIGS. 1 and 2, an outer tube 3 is telescopically inserted into an inner tube 1 via an O-ring 2 which maintains airtightness. Outer tube 3
The outer tube angle 5 is fixed to the inside of the outer end of the outer tube angle 5 by welding or the like, and a small hole 52 is provided in the outer tube angle 5 near the center of the outer tube 3 diameter. That thread 9
2, fix with nuts 6 and 8. An inner pipe angle 4 is elastically locked to the melons 41, 41 so as to press the tip 11 of the inner pipe from the inside. The inner pipe angle 4 has a bearing 42 at a portion near the center of the diameter of the inner pipe 1 in a state of being locked to the inner pipe 1, and slidably supports the core rod 9. One end of the core rod 9 is a stopper for preventing the stopper from coming off from the bearing 42.
91 is molded. A thread 92 is provided on the other end of the core rod 9 so that the nuts 6 and 8 can be screwed thereto.

Next, the assembly of the above parts will be described.

After inserting the core rod 9 into the bearing 42 of the inner pipe angle 4 from the side of the thread 92, the nut 6 is screwed and fixed to the thread 92. In this state, sandwich the watermelon 41, 41 of the inner pipe angle 4 and insert it into the tip of the inner pipe 1,
Cucurbits (41, 41) are elastically pressed and locked to the tip (11) of the inner tube from the inner diameter side.

Next, after confirming that the O-ring 2 is inserted in the joint 31 of the outer tube 3, the outer tube 3 is inserted into the inner tube 1. At this time,
The tip (thread 92) of the core rod 9 held by the inner pipe 1 is inserted into the small hole 52 of the outer pipe angle 5 fixed to the tip of the outer pipe 3, and is screwed to the tip of the core rod 9 first. The outer pipe angle 5 is sandwiched and screwed with the nut 8 together with the nut 6.

With the above configuration, when the outer pipe 3 is slid from the inner pipe 1 and the length of the exhaust pipe is extended, the core rod 9 becomes the inner pipe angle 4
The bearing 42 slides. In this way, when the length of the exhaust pipe is extended to the maximum, the retainer 91 of the core rod 9 becomes the inner pipe angle 4
The outer tube 3 cannot be extended beyond that, and cannot be removed even if a load of 20 kg is applied.

Next, when the outer pipe 3 is pushed into the inner pipe 1 and the length of the exhaust pipe is shortened, the core rod 9 slides on the bearing 42 of the inner pipe angle 4.

The convex portion 14 of the inner pipe 1 and the convex portions 31 and 32 of the outer pipe 3 are used as O-rings for maintaining airtightness when connected to the inside of the pipe or as protrusions for retaining and retaining when connecting the exhaust pipe. To do.

Also, the bearing 42 of the inner pipe angle 4 and the core rod 9 do not slide lightly,
A little heavy is good. If there is a large difference between the inner diameter of the bearing 42 and the outer diameter of the core rod 9, the vibration of the fan motor of the FF type oil warming body is transmitted, and the core rod 9 and the bearing
This is because a vibration sound may be generated between 42.

The length of the exhaust pipe is adjusted by expanding and contracting the exhaust pipe when the FF type oil warming is installed, and since it does not expand and contract many times, even if the bearing 42 and the core rod 9 slide heavily. There is no particular problem.

<Effect of the Invention> The expandable tube of the present invention adjusts the expansion and contraction by rotatably and slidably inserting the outer tube into the inner tube and sliding the outer tube with respect to the inner tube while rotating the outer tube. An exhaust pipe is formed, and an angle is fixed inside the inner pipe and the outer pipe of the exhaust pipe at a position where the outer pipe can be slid up to the maximum length with respect to the inner pipe. Fix one end of the core rod to the other end and penetrate the other end of the core rod into the other angle to dispose the core rod inside the exhaust pipe and rotate the outer pipe with respect to the inner pipe. While the slide pipe is slid to maximize the length of the exhaust pipe, a detachment prevention part for preventing the detachment of the outer pipe from the inner pipe is formed at the other end of the core rod. The maximum length of the exhaust pipe is effectively exhausted using the lengths of the inner and outer pipes. The trachea can be extended and the outer pipe can be reliably prevented from coming off the inner pipe. Further, since the detachment preventing portion is provided inside the exhaust pipe, the outer pipe can be removed from the inner pipe with respect to the inner pipe. Since it is not necessary to provide a structure for preventing the outer pipe from coming off, the appearance of the exhaust pipe is not spoiled, and the outer pipe is slid while being rotated with respect to the inner pipe to adjust the expansion and contraction. The expansion and contraction of the exhaust pipe can be easily adjusted with a small operation force, and in addition, the delicate length adjustment of the expansion and contraction can be performed very easily.

[Brief description of drawings]

FIG. 1 is a plan view of an exhaust pipe which can be expanded and contracted according to an embodiment of the present invention, and shows a cross section of a main part. FIG. 2 is a perspective view for explaining the components of FIG. 1, FIG. 3 is a side view of an installation state of a forced air supply / exhaust type oil hot air heater, and FIG. 4 is a plan view of a conventional telescopic pipe. Is shown in cross section. 1 ... inner tube, 3 ... outer tube, 4 ... inner tube angle, 5 ...
Outer pipe angle, 6,8 ...... nut, 9 …… core rod, 91 …… prevents coming off.

Claims (1)

[Scope of utility model registration request] 1. An exhaust pipe, which is rotatably and slidably inserted into an inner pipe and is slidably rotated with respect to the inner pipe to adjust expansion and contraction, the exhaust pipe is provided. An angle is fixed inside the inner tube and the outer tube at a position where the outer tube can be slid up to the maximum length with respect to the inner tube, and one end of the core rod is fixed to one of the angles. Along with the other end of this core rod to penetrate the other angle, the core rod is disposed inside the exhaust pipe,
A detachment prevention portion is formed at the other end of the core rod to prevent the outer pipe from being detached from the inner pipe when the outer pipe is rotated and slid with respect to the inner pipe to maximize the length of the exhaust pipe. Flexible tube characterized by.