JPS6115385Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a protective cover device attached to an exhaust pipe of a combustion machine, particularly a protective cover device for an exhaust pipe of a supply/exhaust hot air heater installed indoors.

When the supply/exhaust hot air heater is operating, combustion exhaust gas passes through the exhaust pipe, and the exhaust pipe is heated by this combustion exhaust gas, and the temperature of the exhaust pipe, especially near the rear side wall of the outer box, reaches over 100 degrees Celsius. . If combustible materials such as cloth from curtains, pieces of paper, dust, etc. come into contact with this high-temperature part, there is a risk of smoke or ignition resulting in a fire, and if people or animals come into contact with it, they will inevitably suffer burns, so this danger is prevented. A protective cover is installed to cover the hot part of the exhaust pipe.

Fig. 1 is a perspective view showing a state in which a conventional exhaust pipe protective cover is attached, and Fig. 2 is an exploded perspective view showing the exhaust pipe protective cover of Fig. 1. In the figure, 1 is an outer box of the air supply/exhaust type hot air heater, 1a is a rear side wall of this outer box 1, and 2 is an exhaust pipe attached to this rear side wall 1a. It consists of a first pipe 2a provided on the upstream side of the combustion exhaust gas flowing through and a second pipe 2b connected to the downstream side of this first pipe 2a, and 3 covers the periphery of the first pipe 2a. This protective cover is composed of a protective cover main body 3a and a holding piece 3b, and can be attached to and detached from the first pipe 2a using bolts 4 and nuts 5.

Since the conventional protective cover 3 is constructed as described above, as shown in FIG.
While tightening the first pipe 2a by winding it around the outer circumference of the holding piece 3b, using the bolt 4 and nut 5,
The protective cover body 3a is fixed to the first tube 2a, and the protective cover 3 is attached around the first tube 2a.

However, supply/exhaust type hot air heaters are often installed near the walls of rooms, and in such cases, the hot air heaters are held in the exhaust pipe 2 located in a narrow space between the outer box 1 and the wall (not shown). It is not easy to attach the piece 3b and the protective cover main body 3a to the proper position by tightening the bolts 4. Therefore, the protective cover 3 is likely to be incompletely tightened to the exhaust pipe 2, and as a result, an external force along the axial direction of the exhaust pipe 2 is applied directly to the protective cover 3, and the protective cover 3 easily moves in the axial direction. In addition, if the exhaust pipe 2 is tilted or stands upright, the protective cover 3 may pivot over the exhaust pipe 2 due to external impact force due to contact of humans or animals to the heater or excitation force due to vibration of the heater. It may also move in the direction.

If the protective cover 3 moves from the predetermined position, the high temperature part of the exhaust pipe 2 will be exposed, and there is a risk that this exposed state will not be noticed and left in a dangerous condition.
Conventionally, no special measures have been taken to deal with such a risk.

The purpose of this invention is to obtain a protective cover device for an exhaust pipe that, once installed at a predetermined position on the exhaust pipe, does not move even when subjected to external impact force, vibration, etc. be.

For this purpose, the configuration of this invention includes an exhaust pipe through which combustion exhaust gas passes and a protective cover body that covers the exhaust pipe, and the exhaust pipe is connected to a first pipe and a downstream side of the combustion exhaust gas from the first pipe. the first tube has a first protrusion on the outer periphery of its downstream end, the second tube has a second protrusion on the outer periphery of its upstream end, and A first movement prevention piece adjacent to the first protrusion on the upstream side and attached to the outer periphery of the first pipe; and a first movement prevention piece adjacent to the downstream side of the second protrusion and attached to the outer periphery of the second pipe. A second movement prevention piece is formed integrally with the protective cover main body, and a holding piece for surrounding the protective cover main body at a constant distance from the exhaust pipe is integrally formed with the protective cover main body. .

An embodiment of this invention will be described below.

3 is a perspective view showing an embodiment of this invention, FIG. 4 is a sectional view of the protective cover in FIG. 3 taken together with the exhaust pipe, FIG. 5 is a bottom view of the protective cover in FIG. 3, and FIG. The figure is a side view of the protective cover of FIG. 5. 3 to 6, 1 is the same outer box as the conventional device, and 2 is an exhaust pipe with a circular cross section attached to the outer box 1, which includes a first pipe 2a and a first pipe 2a. A second pipe 2b is connected to the downstream end of the pipe 2a, and a first protrusion 2a1 having an annular shape is formed around the entire circumference of the first pipe 2a at the connecting part. A groove 2a2 having an annular shape over the entire circumference is provided on the inner periphery of the first tube 2a corresponding to the position of the first protrusion 2a1, and a flexible sealing material 2a3 is provided in the groove 2a2. has an annular shape, and a second protrusion 2b1 is formed on the outer periphery of the end of the second tube 2b that is connected to the first tube 2a. Reference numeral 3 denotes a protective cover that covers the high-temperature part of the exhaust pipe 2, which is formed by punching out a single metal plate and then bending it, and is a protective cover main body 3.
The whole is integrally constituted by the holding piece 3b, the first movement prevention piece 3c, and the second movement prevention piece 3d. It is formed to cover the sides, so that the holding piece 3b, the first movement prevention piece 3c, and the second movement prevention piece 3d sandwich the outer periphery of the exhaust pipe 2.
The bottom portion 3b1, the first bottom portion 3c1, and the second bottom portion 3d1 of the holding piece, which are each formed into a substantially Ω-shape and which are the intermediate portions of the Ω-shape, are integral with the side cover portion 3a1. Reference numeral 6 denotes a heat radiation hole provided in the protective cover main body 3a.

The exhaust pipe 2 and the protective cover 3 are constructed in this way, and the holding piece 3b made of an elastic material has a substantially Ω-shape so as to hold the outer periphery of the exhaust pipe 2 having a circular cross section, and the bottom part 3b1 of the holding piece is attached to the side cover. Since the protective cover 3 is formed integrally with the part 3a1, no screws are required for installation, and the protective cover 3 can be easily attached and detached onto the exhaust pipe 2, and can be easily and securely installed on the exhaust pipe 2 located in a narrow space. The device with the protective cover 3 can be installed.

Furthermore, by attaching integrally formed first and second movement prevention pieces 3c and 3d adjacent to the first and second projections 2a1 and 2b1, the first and second projections 2a1, 2b1 is kept constant, movement of the protective cover 3 in the axial direction of the exhaust pipe is prevented, and the connecting portion between the first and second pipes 2a and 2b is firmly held.

Furthermore, the protective cover 3 is a protective cover main body 3.
Holding piece 3 for attachment to exhaust pipe 2 in a
b, and first and second movement prevention pieces 3c, 3 mainly for preventing movement of the exhaust pipe 2 in the axial direction.
d are integrally formed, there is no need for special parts such as mounting brackets to connect these parts to each other, and the dimensional relationship of each part is maintained constant, making it easy to attach to the exhaust pipe 2. It is easy to carry out the work at the time, and since it is integrally formed, it is advantageous in terms of manufacturing costs and ease of handling.

Furthermore, a sealing material 2a3 such as an O-ring is filled into an annular gap surrounded by an endless annular groove 2a2 provided on the inner periphery of the first tube 2a and an outer periphery of the second tube 2b facing the groove 2a2. By doing so, the gap between the inner periphery of the first pipe 2a and the outer periphery of the second pipe 2b is sealed, and the combustion exhaust gas passing through the exhaust pipe 2 is transferred to the joint between the first and second pipes 2a and 2b. There is no risk of leakage into the room.

As described above, according to the configuration of this invention, there is no need for screws to attach the exhaust cover, and the protective cover can be easily attached to and removed from the exhaust pipe, and can be easily installed on the exhaust pipe located in a narrow space. This ensures that the protective cover device can be used.

Furthermore, by attaching the first and second integrally formed movement prevention pieces adjacent to the first and second protrusions, the distance between the first and second protrusions can be maintained constant. This prevents the protective cover from moving in the axial direction of the exhaust pipe.

Furthermore, the protective cover is integrally formed with a holding piece for attachment to the exhaust pipe and first and second movement prevention pieces mainly for preventing movement of the exhaust pipe in the axial direction. Because of this, there is no need for special parts such as mounting brackets to connect these parts to each other, and the dimensional relationship of each part is maintained constant, making it easy to attach to the exhaust pipe. Furthermore, since they are integrally formed, manufacturing time and assembly work time can be shortened, and manufacturing costs can be reduced.

[Brief explanation of the drawing]

Figures 1 and 2 are perspective views showing a conventional exhaust pipe protective cover, Figure 3 is a perspective view of an exhaust pipe protective cover showing an embodiment of this invention, and Figure 4 is an embodiment of this invention. A sectional view of an exhaust pipe and a protective cover showing an example, FIG. 5 is a bottom view of an exhaust pipe protective cover showing an embodiment of this invention, and FIG. 6 is a cross-sectional view of an exhaust pipe protection cover showing an embodiment of this invention. FIG. In the figure, 1 is an outer box, 2 is an exhaust pipe, 2a is a first pipe, 2a1 is a first protrusion, 2a2 is a groove,
2a3 is a sealing material, 2b is a second tube, 2b1 is a second protrusion, 3 is a protective cover, 3a is a protective cover body, 3a1 is a side cover part, 3b is a holding piece, 3b1
is the bottom of the holding piece, 3c is the first movement prevention piece, 3c
1 is the first bottom, 3d is the second movement prevention piece, 3d
1 is the second bottom. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) It has an exhaust pipe through which combustion exhaust gas passes and a protective cover body that covers the exhaust pipe, and the exhaust pipe has a first pipe and a combustion exhaust gas downstream side of the first pipe. The first tube has a first protrusion on the outer periphery of its downstream end, and the second tube has a second protrusion on the outer periphery of its upstream end. and a first movement prevention piece adjacent to the first protrusion on the upstream side and attached to the outer periphery of the first pipe; and a first movement prevention piece adjacent to the second protrusion on the downstream side of the second pipe. A second movement prevention piece attached to the outer periphery is integrally formed with the protective cover body, and a holding piece for surrounding the protective cover body at a constant distance from the exhaust pipe is integrally formed with the protective cover body. A protective cover device for an exhaust pipe characterized by: (2) The side of the exhaust pipe is covered by the side cover part of the protective cover main body, and the first and second movement prevention pieces and the holding piece are formed in a substantially Ω shape, and their bottoms are connected to the side cover part. A protective cover device for an exhaust pipe according to claim 1, which is integrally formed. (3) A flexible annular sealing material is placed on the outer periphery of the upstream end of the second pipe, and the sealing material is surrounded by an endless annular groove provided on the inner periphery of the first pipe. A protective cover device for an exhaust pipe according to claim 1, wherein a first protrusion is formed on the outer periphery of the first pipe facing the groove.