JP2000220784A - Supply and exhaust tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a supply and exhaust tube of an exhaust pipe at a low cost simplifying connection work without spoiling the appearance after the work. SOLUTION: A groove part 2b is formed at an inner peripheral surface of a roughly cylindrical exhaust pipe connecting part 2 integrally formed with a supply and exhaust tube. A pawl 7a inclining and rising in a longitudinal direction from a tip side of an exhaust pipe 7 and wherein one side rim is in a shape inclining in a width direction so as to approach an outer peripheral surface of the exhaust pipe 7 is fixed to the outer peripheral surface of the exhaust pipe 7. A projection part 7b projecting from the outer peripheral surface is provided on the exhaust pipe 7 in a circumferential direction. When the exhaust pipe 7 is inserted into the exhaust pipe connecting part 2, the projection part 7b of the exhaust pipe 7 abuts to an opened end of the exhaust pipe connecting part 2 and the pawl 7a is locked to the groove part 2b of the exhaust pipe connecting part 2. Thus, the exhaust pipe 7 is strongly connected to the exhaust pipe connecting part 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a supply / exhaust tube of a closed-type warm air heater or the like which sucks combustion air from the outside and discharges combustion exhaust gas to the outside. It relates to a connection structure.

[0002]

2. Description of the Related Art FIG. 5 is a cross-sectional view showing an example of a conventional supply / exhaust cylinder in an attached state. First, a procedure for attaching the supply / exhaust tube 1 to the wall 6 will be described with reference to FIG. As shown in FIG. 5, a mounting hole 6a for mounting the air supply / exhaust tube 1 is provided in the wall 6 facing the outdoor, and the wall 6 on both the indoor side and the outdoor side of the wall 6 has the mounting holes 6a. Inclined flanges 4, 4 for covering a part of the hole 6 a and tilting and fixing the air supply / exhaust tube 1 are provided with the wall 6 interposed therebetween.

After the air supply / exhaust tube 1 is inserted into the mounting hole 6a of the wall 6 from the indoor side, the flange nut 5 is fitted into the one-hole sleeve 1a of the air supply / exhaust tube 1 from the outdoor side. Thereby, the air supply / exhaust tube 1 is moved to the wall 6 while maintaining the indoor airtightness.
Can be securely fixed without any problems. Here, since the inclined flanges 4 and 4 have a predetermined inclination (α in the figure, usually about 5 °) with respect to the wall surface of the wall 6, the supply / exhaust cylinder 1
Is attached with a gentle inclination by the inclination α with respect to the horizontal direction so that the outdoor side is relatively low as shown in the figure. This can prevent the inflow of rainwater and the backflow of water contained in the exhaust gas.

Next, a method of connecting the exhaust pipe 7 to the supply / exhaust tube 1 will be described. First, the exhaust pipe 7 is inserted into the exhaust pipe connection portion 2 of the supply / exhaust tube 1. Then, as shown in FIG. 7, after covering the connection part between the exhaust pipe connecting part 2 and the exhaust pipe 7 with the stopper metal 8, the mounting band 8 b of the stopper metal 8 is tightened with the band screw 9. Thereby, the detachment prevention metal fitting 8 is fixed to the exhaust pipe 7. As a result, even if a force is applied to the exhaust pipe 7 in a direction in which the exhaust pipe 7 is pulled out of the exhaust pipe connection 2 of the air supply / exhaust tube 1, the claw 8 a of the slip-off metal fitting 8 is inserted into the groove 2 a projecting from the outer periphery of the exhaust pipe connection 2. Locked, exhaust pipe connection 2
It is possible to prevent the exhaust pipe 7 from coming off from the opening.

[0007] Of the unexplained reference numerals in the drawing, reference numeral 7 b denotes a projection provided so as to protrude in the circumferential direction from the outer peripheral surface of the exhaust pipe 7. Since the outer diameter of the projection 7b is set to be larger than the inner diameter of the exhaust pipe connection part 2, the exhaust pipe 7 is connected to the exhaust pipe connection part 2.
The protrusion 7b abuts on the opening of the exhaust pipe connection part 2 when inserted, so that the exhaust pipe 7 can be prevented from going too far into the exhaust pipe connection part 2. Reference numeral 2a denotes a groove formed by bending the inner peripheral surface of the exhaust pipe connecting portion 2 in a circumferential direction by press working or the like. A rubber O-ring 3 for preventing gas leakage from between the exhaust pipe 7 and the exhaust pipe connection 2 is fitted in the groove 2a.

FIG. 6 is a sectional view taken along line DD in FIG. As shown in FIG. 6, the supply / exhaust cylinder 1 is
1 and an exhaust pipe 12 provided on the inside thereof. The air supply cylinder 11 and the exhaust pipe 12 are both connected to a combustion chamber of a closed hot air heater (not shown). When the closed hot air heater is operated, the air supply cylinder 11 of the air supply / exhaust cylinder 1 is driven by a blower (not shown). The combustion air is taken in from outside through the exhaust gas, and the exhaust gas after combustion is discharged from the exhaust stack 12 to the outside.

[0007]

However, when the exhaust pipe 7 is connected to the supply / exhaust pipe 1 in the conventional supply / exhaust pipe, the exhaust pipe 7 is inserted into the exhaust pipe connection portion 2 of the supply / exhaust pipe 1. In addition, the fitting 8 must be attached, which increases the cost, takes time and labor for the operation, and is not preferable from the viewpoint of aesthetics.

The present invention has been made in view of the above circumstances, and simplifies the work of connecting the exhaust pipe to the supply / exhaust cylinder, and reduces the cost of the supply / exhaust cylinder without impairing the appearance after the operation. The purpose is to provide.

[0009]

According to a first aspect of the present invention, there is provided a supply / exhaust cylinder which inhales combustion air from outside and discharges combustion exhaust gas to the outside. The exhaust pipe has a substantially cylindrical exhaust pipe connection portion into which the pipe is inserted, and a groove formed on the inner peripheral surface of the exhaust pipe connection portion, and the exhaust pipe has a projection protruding from the outer peripheral surface. When the exhaust pipe is inserted into the exhaust pipe connection portion, the projection comes into contact with the opening end of the exhaust pipe connection portion, and the claw-shaped member provided near the tip of the exhaust pipe is connected to the groove portion. It is characterized by being locked.

According to this structure, unlike the related art, a detachment prevention metal fitting is separately prepared, and the trouble of fixing the connecting portion between the exhaust pipe and the exhaust pipe connecting portion of the supply / exhaust tube can be omitted, thereby facilitating the connection.

According to a second aspect of the present invention, there is provided the supply / exhaust cylinder according to the first aspect, wherein the claw-like member rises up from the tip end of the exhaust pipe in a longitudinal direction and is one of the two. It is characterized in that the side edge has a shape inclined in the width direction so as to approach the outer peripheral surface of the exhaust pipe.

According to this structure, when the exhaust pipe is inserted into the supply / exhaust pipe exhaust pipe connection portion, the raised portion of the claw-shaped member provided on the exhaust pipe engages with the groove of the exhaust pipe connection portion. The pipe and the exhaust pipe connection are firmly connected. Conversely, with the exhaust pipe connected to the exhaust pipe connection,
By applying a force in a direction to separate the exhaust pipe and rotating the exhaust pipe in an appropriate direction, the claw-shaped member is pressed against the inner wall surface of the exhaust pipe connection part, and the claw-shaped member and the groove between the exhaust pipe connection part are formed. Is disengaged.

[0013]

Embodiments of the present invention will be described with reference to the drawings. Incidentally, the supply / exhaust cylinder according to the present invention,
Since only the connection structure of the exhaust pipe is different from that of the conventional example, members common to those of the conventional air supply / exhaust tube are denoted by the same reference numerals, and detailed description thereof will be omitted. FIG. 1 is a sectional view showing a state in which the supply / exhaust tube according to the present invention is attached to a wall. The method of attaching the supply / exhaust tube 1 to the wall 6 conforms to the method described with reference to the conventional supply / exhaust tube (see FIG. 4), and a description thereof will be omitted.

As shown in FIG. 1, an inner peripheral surface of an exhaust pipe connecting portion 2 of a supply / exhaust cylinder 1 has two grooves 2a, 2b in a circumferential direction.
Is provided. Of these, a rubber O-ring 3 is fitted in the groove 2 a closer to the opening end of the exhaust pipe connection 2. The inner diameter of the O-ring 3 is set slightly smaller than the inner diameter of the exhaust pipe connection 2 in order to prevent gas leakage from between the exhaust pipe 7 and the exhaust pipe connection 2.

FIG. 2 is a sectional view of a main part showing a connection state between the exhaust pipe 7 and the exhaust pipe connecting portion 2, and FIG. As shown in these figures, near the front end of the outer peripheral surface of the exhaust pipe 7, the rear end of a claw 7a formed by processing a substantially rectangular thin stainless plate or the like is spotted on the bottom surface of the concave portion 7c of the exhaust pipe 7. It is fixed by welding or the like. The concave portion 7c is formed by depressing the outer peripheral surface of the exhaust pipe 7 into a rectangular shape by press working or the like, and has a size and shape that allows the entire claw 7a to be immersed. As shown in FIG. 4, the tip of the claw 7 a rises up in the longitudinal direction from the tip side of the exhaust pipe 7 and rises in the width direction so that one side edge is close to the outer peripheral surface of the exhaust pipe 7. You are.

Therefore, when the exhaust pipe 7 is inserted into the exhaust pipe connecting portion 2 of the supply / exhaust tube 1, as shown in FIG. 2, an annular projection 7b projecting from the outer peripheral surface of the exhaust pipe 7 becomes an exhaust pipe connecting portion. 2
And the tip of the claw 7a engages with the groove 2b of the exhaust pipe connection part 2, so that the exhaust pipe 7 and the exhaust pipe connection part 2 are always and securely connected at the same position. As a result, even if an external force is applied to the exhaust pipe 7 in a direction in which the exhaust pipe 7 comes off from the exhaust pipe connection portion 2, the exhaust pipe 7 does not come off because the claw 7a contacts the groove 2b. Further, since the O-ring 3 fitted into the other groove 2a of the exhaust pipe connecting portion 2 and the exhaust pipe 7 are in close contact with each other, leakage of exhaust gas into the room can be prevented.

Conversely, in a state where the exhaust pipe 7 is connected to the exhaust pipe connection portion 2, a force is applied in a direction to separate the exhaust pipe 7 from the exhaust pipe connection portion 2 as shown by an arrow A in FIG. When the exhaust pipe 7 is rotated clockwise as indicated by an arrow B, one side edge of the claw 7a is pressed at the groove edge of the groove 2b of the exhaust pipe connection portion 2. Thereby, the claw 7a is elastically deformed,
It is immersed in the concave portion 7c of the exhaust pipe 7. Further, by pulling out the exhaust pipe 7 from the exhaust pipe connecting portion 2, both can be separated.

[0018]

According to the first aspect of the present invention, the connection between the exhaust pipe and the exhaust pipe connection portion of the supply / exhaust tube is formed between the claw-shaped member provided on the exhaust pipe and the inner peripheral surface of the exhaust pipe connection portion. Since the connection operation is performed by engagement with the provided groove portion, the connection operation can be reliably performed with one touch, and the operation time can be greatly reduced. Further, since there is no need to dispose a fitting for preventing the connection from being provided at the connecting portion as in the related art, the cost can be reduced by reducing the number of components, and the appearance of the connecting portion is not spoiled. Further, when the exhaust pipe is inserted into the exhaust pipe connection portion, the projection formed so as to protrude from the outer peripheral surface of the exhaust pipe comes into contact with the opening end of the exhaust pipe connection portion. Can always be reliably performed at the same position.

According to the second aspect of the present invention, when the exhaust pipe is inserted into the exhaust pipe connection, the raised portion of the claw-shaped member provided on the exhaust pipe engages with the groove of the exhaust pipe connection. Thus, the exhaust pipe is firmly connected to the exhaust pipe connection. Therefore, even if an external force is applied to the exhaust pipe in a direction in which the exhaust pipe comes out of the exhaust pipe connection portion, the exhaust pipe does not come off because the claws come into contact with the grooves. Conversely, in a state where the exhaust pipe and the exhaust pipe connection portion are connected, while applying a force in a direction in which the exhaust pipe is separated from the exhaust pipe connection portion, and rotating the exhaust pipe in an appropriate direction, the claw-shaped member is formed. It is elastically deformed and pressed against the inner peripheral surface of the exhaust pipe connection. By pulling out the exhaust pipe in this state, the exhaust pipe can be separated from the exhaust pipe connection. That is, the connection and disconnection of the exhaust pipe and the exhaust pipe connecting portion can be freely performed by a simple operation.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a state in which a supply / exhaust tube according to an embodiment of the present invention is attached to a wall.

FIG. 2 is a cross-sectional view of a main part of a connection part between an exhaust pipe connection part and an exhaust pipe of a supply / exhaust cylinder according to an embodiment of the present invention.

FIG. 3 is a perspective view of a main part near the tip of an exhaust pipe according to the present invention.

FIG. 4 is a cross-sectional view of a claw provided in an exhaust pipe according to the present invention.

FIG. 5 is a schematic cross-sectional view showing a state in which a conventional supply / exhaust tube is attached to a wall.

6 is a sectional view taken along line DD in FIG.

FIG. 7 is an enlarged view of a connection portion between an exhaust pipe connection portion and an exhaust pipe of a conventional supply / exhaust cylinder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Supply / exhaust cylinder 2 Exhaust pipe connection part 3 O-ring 4 Inclined flange 5 Flange nut 6 Wall 7 Exhaust pipe 8 Pull-out prevention fitting 9 Band screw 11 Supply cylinder 12 Exhaust cylinder

Claims (2)

[Claims] 1. A supply / exhaust pipe for sucking combustion air from outside and discharging combustion exhaust gas to the outside, a substantially cylindrical exhaust pipe connection part into which an exhaust pipe is inserted, and an inner periphery of the exhaust pipe connection part. A groove formed on a surface of the exhaust pipe, and a projection protruding from an outer peripheral surface of the exhaust pipe is formed on the exhaust pipe. When the exhaust pipe is inserted into the exhaust pipe connection portion, the projection is attached to the exhaust pipe. An air supply / exhaust cylinder, wherein a claw-shaped member provided near an end of the exhaust pipe is locked in the groove while being in contact with an opening end of a connection portion. 2. The claw-shaped member has a shape that is inclined and rises in a longitudinal direction from a tip end side of the exhaust pipe, and is inclined in a width direction such that one side edge is close to an outer peripheral surface of the exhaust pipe. The supply / exhaust cylinder according to claim 1, wherein: