JP2008298108A - Slipping-out preventive structure of supply-exhaust pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide slipping-out preventive structure of a supply-exhaust pipe, easy in processing and reducing a cost increase, by providing sufficient strength against extraction force. <P>SOLUTION: A locking part 8 of a slipping-out preventive lever 6 arranged in the supply-exhaust pipe 1, is formed of suspending plates 9 and 9 being a plate-like body in its radial direction in parallel to the axial direction of the supply-exhaust pipe 1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a structure for preventing a connection portion from being detached in a supply / exhaust pipe provided in a combustion appliance such as a water heater for supplying combustion air or discharging combustion exhaust gas and connecting the pipes to each other.

  The supply / exhaust pipes provided in the combustion appliance are formed by connecting a plurality of ends of the supply / exhaust pipes formed in a certain length on site in consideration of transportation and the like. As this connection structure, for example, as disclosed in Patent Document 1, a fixed supply / exhaust pipe having a receiving port (female portion) at one end and an insertion port (male portion) at the other end is inserted into the receiving port. A type that is coaxially connected to the mouth is often used. In particular, here, a lock member (a retaining member) in which a cut window is formed on the receiving side and is held on the outer surface by a cover so as to be slidable, and a U-shaped lock portion provided at the tip is positioned in the cut window. On the other hand, when the receiving port of the other pipe is inserted to the predetermined position on the insertion port side, the omission is formed with a circumferential groove facing the cutting window and locking the locking portion of the locking member to prevent the omission. Stop structure is adopted.

JP 2000-304182 A

  In the above-described retaining structure of Patent Document 1, the U-shaped lock portion serving as the locking portion is locked along the circumferential groove, and the lock portion is oriented in the axial direction of the air supply / exhaust pipe. The strength is insufficient with respect to the pulling force, and there is a risk of deformation when a strong force is applied. Thus, measures to increase the thickness of the lock member or perform special processing can be considered, but the material cost is increased and the manufacturing process is increased, leading to an increase in cost.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a supply / exhaust pipe retaining structure that can obtain a sufficient strength against a pulling force, that is easy to process and less expensive.

In order to achieve the above object, the invention according to claim 1 is characterized in that the locking portion of the retaining member is formed of a plate-like body parallel to the axial direction of the tube and along the radial direction of the tube. It is what.
In addition to the object of the first aspect, the invention described in claim 2 has a U-shaped cross section having a pair of plate-like bodies in order to easily obtain a stronger locking portion. It is characterized by this.

According to the first aspect of the present invention, the structure is difficult to be deformed against an external force in the axial direction, and a sufficient strength against the pulling force can be obtained. However, since it is a simple structure for forming a plate-like body, the processing is simple and the cost increase is small.
According to the second aspect of the present invention, in addition to the effect of the first aspect, a locking portion with higher strength can be easily obtained.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory view showing an example of a structure for preventing the removal of the supply / exhaust pipe of the present invention. In the figure, reference numerals 1 and 2 denote metal supply / exhaust pipes each having a predetermined length. A female part 3 is formed at the end, and a male part 4 having a smaller diameter is formed at the end of the air supply / exhaust pipe 2, and both pipes 1 and 2 are coaxially formed by inserting the male part 4 into the female part 3. Connection is possible. In addition, the insertion direction (right side of FIG. 1) of the male part 4 is demonstrated as the front here.
A rectangular window 5 is formed on the outer surface of the air supply / exhaust pipe 1 at the rear end, and a retaining lever 6 as a retaining member is provided behind the window 5. The retaining lever 6 has a rear end attached to the outer surface of the air supply / exhaust pipe 1 and an intermediate portion connected to a support plate 7 that rises in an inverted L shape so that the front end protrudes to the outside of the window 5. As shown in FIG. 2, a U-shaped locking portion 8 formed by bending a pair of hanging plates 9, 9 parallel to the axial direction of the air supply / exhaust pipe 1 and along the radial direction thereof is formed. Has been. In addition, a round is given to the corners of the bottom plate 9 before and after the lower end.

  Due to the elasticity of the front end of the support plate 7, the front and rear ends of the retaining lever 6 can swing up and down around the intermediate portion. Under normal conditions, the lower ends of the drooping plates 9 and 9 penetrate the window 5 and supply and exhaust air. It is supported in a posture that protrudes into the tube 1. Therefore, when the rear end of the retaining lever 6 is pushed down, the front locking portion 8 rises and the lower ends of the hanging plates 9, 9 can be retracted from the inside of the air supply / exhaust pipe 1. A cover 10 is provided on the outer surface of the air supply / exhaust pipe 1 so as to cover the window 5 and the locking portion 8 of the retaining lever 6, and 11 is held in front of the window 5 on the inner surface of the air supply / exhaust pipe 1 and inserted. It is an O-ring that seals the connecting portion by pressing against the outer surface of the male portion 4 of the supplied / exhaust pipe 2.

  On the other hand, on the outer surface of the air supply / exhaust pipe 2, concave grooves 12 as concave portions are provided in the circumferential direction. The groove 12 is in a position where the hanging plates 9 and 9 of the retaining lever 6 can be locked in a state where the male portion 4 is inserted into the female portion 3 of the air supply / exhaust pipe 1, and the side surface on the front side is the axis line It becomes the latching surface 13 orthogonal to. Further, a tapered portion 14 is formed at the front end of the air supply / exhaust pipe 2 so as to contact the lower end of the hanging plate 9 and push up the locking portion 8 when inserted.

In the air supply / exhaust pipe retaining structure configured as described above, when the male part 4 of the air supply / exhaust pipe 2 is inserted into the female part 3 of the air supply / exhaust pipe 1, the taper part 14 is formed as shown in FIG. The locking portion 8 is pushed up by abutting against the hanging plates 9 and 9 of the retaining lever 6 and is relatively slid rearward along the outer surface of the air supply / exhaust pipe 2. When the concave groove 12 reaches the position of the window 5, the locking portion 8 of the retaining lever 6 descends and the hanging plates 9, 9 are locked to the concave groove 12 as shown in FIG. . Even if the air supply / exhaust pipe 2 is pulled backward in this state, the front end surfaces of the both hanging plates 9 and 9 abut against the locking surface 13 of the concave groove 12 and the rearward movement is restricted. 2 cannot be pulled out.
When the air supply / exhaust pipe 2 is pulled out, if the rear end of the retaining lever 6 is pushed down to raise the locking portion 8, the interference between the front end surfaces of both the hanging plates 9, 9 and the locking surface 13 of the concave groove 12 occurs. Since it is released, the air supply / exhaust pipe 2 can be extracted as it is.

Thus, according to the above-described configuration of the air supply / exhaust pipe retaining structure, the locking portion 8 of the retaining lever 6 is a plate-like body parallel to the axial direction of the air supply / exhaust pipe 1 and along the radial direction thereof. By forming with the hanging plates 9 and 9, it becomes a structure which is hard to deform | transform with respect to the external force of an axial direction, and sufficient intensity | strength is acquired with respect to the extraction force. In addition, since it is a simple structure for forming the hanging plates 9, 9, the processing is simple and the cost increase is small.
In particular, here, the locking portion 8 has a U-shaped cross section having a pair of hanging plates 9, 9 so that a locking portion with higher strength can be easily obtained.

In addition, in the said form, although the latching | locking part is made into the cross-sectional U shape which provided one pair of drooping plates, it is good also as a cross-sectional T shape which made the drooping plate one sheet.
Further, the number of retaining members is not limited to one, and a plurality of retaining members may be disposed in the circumferential direction of the air supply / exhaust pipe. Furthermore, instead of a window, a notch is formed, or a window or notch is not provided, and the retaining member protrudes from the end edge at the edge of the supply / exhaust pipe with the direction of the retaining member reversed backward and forward. It is also possible to change the design such as locking with the recess.
In addition, the recessed portion is not limited to the recessed groove, and the design may be appropriately changed such as partially forming the recessed portion corresponding to the position of the retaining member or forming the throttle groove for increasing the strength of the air supply / exhaust pipe. There is no problem.

It is explanatory drawing of a retaining structure, (A) shows a connection state immediately before (B) and (B) respectively. It is a perspective view of a latching | locking part.

Explanation of symbols

  1, 2 ... Air supply / exhaust pipe 3 ... Female part 4 ... Male part 5 ... Window 6 ... Stopping lever 7 ... Support plate 8 ... Locking part 9 ... Plate, 12 ... concave groove, 13 ... locking surface.

Claims (2)

In the supply / exhaust pipe formed by inserting the male part formed at the end of the other pipe into the female part formed at the end of one pipe and connecting the two pipes coaxially, Is provided with a retaining member provided with a locking portion that elastically protrudes toward the inside of the one air supply / exhaust pipe, and the locking portion of the retaining member is engaged with the male portion in a state where the tubes are inserted into each other. It is a retaining structure provided with recesses to stop,
The retaining structure of the air supply / exhaust pipe, wherein the retaining portion of the retaining member is formed of a plate-like body parallel to the axial direction of the one pipe and along the radial direction of the pipe.   2. The air supply / exhaust pipe retaining structure according to claim 1, wherein the engaging portion has a U-shaped cross section having a pair of plate-like bodies.

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