JP4097167B2 - Supply / exhaust pipe connection device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a fixed-size air supply / exhaust gas used when introducing external air from a supply / exhaust pipe of a combustion appliance such as a water heater or other equipment, or from the outside, or discharging indoor exhaust to the outdoors. The present invention relates to a pipe connecting device.
[0002]
[Prior art]
In the case of combustion appliances such as water heaters, in order to prevent the risk of combustion exhaust leaking indoors due to disconnection of the exhaust pipe, in the case of a fixed-size supply / exhaust pipe that is used in conjunction with it, it will fall out of delusion. A locking mechanism is provided at the connecting portion so as not to come off.
[0003]
FIG. 3 shows an example of this, and this locking mechanism forms a circumferential groove 2 on the insertion port 1 side, and forms a stopper claw releasing slope 4 in a part of the circumferential groove 2 toward the tube end side. The release recess 3 is formed, and a stopper claw 6 is attached to the inner surface on the receiving port 5 side with the tip 6a facing inward and the tip 6a inclined in the tube axis direction. When connecting in this conventional example, the stopper claw 6 is inserted into the receiving port 5 so that the position of the stopper claw 6 does not match the release slope 4 (release recess 3). In this way, when the distal end 6a side of the stopper claw 6 is slid up by the outer peripheral surface of the insertion port 1 and displaced upward and inserted to a fixed position, the distal end 6a of the stopper claw 6 is elastically acted upon by the circumferential groove 2 (Fig. 4 (b)). As a result, the insertion port 1 cannot be pulled out from the receiving port 5.
[0004]
Next, when the insertion port 1 side is pulled out from the receiving port 5, as shown in FIG. 4C, the insertion port 1 side or the receiving port 5 side is rotated and the tip of the stopper claw 6 is placed at the release slope 4. Match 6a. Then, when the insertion port 1 or the receiving port 5 side is pulled in the axial direction, the distal end 6a of the stopper claw 6 is slid up by the release slope 4 and disengaged from the circumferential groove 2, and as shown in FIG. It can be pulled out as it is.
In order to facilitate the extraction, the insertion slot 1 side and the receiving slot 5 side are respectively marked at positions where the stopper claw 6 and the release slope 4 meet.
[0005]
[Problems to be solved by the invention]
However, in the above conventional locking mechanism, there is a concern that if the tube rotates for some reason and the stopper claw 6 and the release slope 4 are matched, it will come off as it is.
Further, since the stopper claw 6 protrudes from the inner peripheral surface of the receiving port 5 by the thickness, there is a defect that a gap corresponding to the thickness of the stopper claw 6 is formed between the outer peripheral surface of the insertion port 1 and the inner peripheral surface of the receiving port 1. .
[0006]
A first object of the present invention is to improve safety by connecting at least three actions in a connection device for an air supply / exhaust pipe so that at least three actions must overlap in order to disconnect the pipe once connected. . Furthermore, the second purpose is to prevent a gap from occurring around the stopper claw when the pipe is connected.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, there is provided an air supply / exhaust pipe connecting device comprising: a. Forming the circumferential groove 11 on the outer peripheral surface that slightly enters the tube axis direction from the groove on the insertion port 10 side of the air supply / exhaust pipe,
b. The guide groove 13 is formed in parallel with the tube axis of the insertion port 10 from a part of the circumference of the circumferential groove 11 toward the groove direction.
c. The engaging wall groove 14 is formed so as to form a T-shape with the guide groove 13 in a direction perpendicular to the guide groove 13 following the tip of the guide groove 13 on the groove side.
d. Both ends of the engagement wall groove 14 are raised to the same height as the outer peripheral surface of the insertion port 10 via the slopes 15 and 15a.
e. A stopper claw 21 whose tip 21a faces away from the inlet direction of the receiving port 20 and is inclined in the tube axis direction is attached to the inner peripheral surface 20a of the receiving port 20 of the supply / exhaust pipe into which the insertion port 10 is inserted. thing,
f. The inner peripheral surface 20a of the insertion port 10 on which the stopper claw 21 is attached has a relief 22 formed in the radial direction by at least the plate thickness of the stopper claw 21;
g. It is characterized by.
[0009]
The supply / exhaust pipe according to the present invention includes a single pipe dedicated to supply or exhaust, and a double pipe structure in which supply is performed by an outer pipe and exhaust is performed by an inner pipe. The material is a stainless steel tube. The stopper claw may be any metal material that is rich in elasticity, but stainless steel is optimally used in the same manner as the air supply / exhaust pipe.
[0010]
The stopper claw and the locking groove may be provided at one place, but may be provided at two positions (symmetric positions) at 180 °, for example. Thus, when two places are provided, even if a bending force acts on the air supply / exhaust pipe and a bending angle is formed at the connection portion, it does not easily come off and safety is improved.
[0011]
[Action]
The tube is connected by inserting the insertion port into the receiving port at a position where the stopper claw and the guide groove do not match. When pulling out the insertion port side from the inside of the receiving port, align the position of the stopper claw with the guide groove, pull out the insertion port side until the tip of the stopper claw touches the engagement wall, and then remove the insertion port side. Rotate. If it does in this way, since the tip of a stopper claw will be slid up along the claw slope, and will come off from an engagement wall, if it pulls an insertion slot as it is, it will come out. In the connection of the pipes described above, various operations have been described centering on the insertion port, but on the contrary, the same operation is performed when the receiving port side is operated.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a connection device with a lock mechanism according to the present invention. A circumferential groove 11 is formed on the outer peripheral surface 10a on the insertion port 10 side of the connecting device, and a part of the circumferential groove 11 is provided with a lock releasing groove 12 in a guide toward the pipe end. A groove 13 is formed, and an engagement wall 14 is formed at the tip of the guide groove 13. Further, on both sides of the engagement wall 14, an upward slope is formed outward from the width W of the guide groove 13. Release slopes 15 and 15a are formed.
[0013]
On the other hand, on the receiving port 20 side, a stopper claw 21 is attached to the inner peripheral surface 20a thereof with the tip 21a side facing the tube depth direction and the tip side inclined toward the tube axis direction. Note that a relief 22 corresponding to at least the thickness of the stopper claw 21 is formed by stepping on the inner peripheral surface of the receiving port 20 to which the stopper claw 21 is attached (see FIG. 2A). With such a configuration, when the insertion port 10 side is inserted into the receiving port 20, a gap corresponding to the thickness of the stopper claw 21 can be formed around the stopper claw 21, or scratches can be caused by the stopper claw 21 on the insertion port 10 side. Can be prevented.
[0014]
FIGS. 2A to 2C show examples of operations when the insertion port 10 side is inserted into the receiving port 20 and locked, and when this lock is released. FIG. This is a state immediately before the insertion port 10 side is inserted inward.
[0015]
FIG. 2B is an explanatory diagram when the insertion port 10 side is inserted into the receiving port 20 to a predetermined position. The tip 21a of the stopper claw 21 is engaged with the circumferential groove 11 and remains in the locked state. Become.
[0016]
FIG. 2 (c) shows a state in which the insertion port 10 or the receiving port 20 side is rotated from the locked state of (b), the stopper claw 21 is aligned with the lock release groove 12, and once pulled, the tip 21a of the stopper claw 21 is engaged. It is stopped when it hits the joint wall 14, and the insertion port 10 or the receiving port 20 is rotated thereon, and the tip 21 a of the stopper claw 21 is slid along the release slope 15 to release the lock. In this state, when the insertion port 10 side or the receiving port 20 side is pulled, the tube can be easily pulled out.
[0017]
【The invention's effect】
As described above, since the present invention is in a locked state simply by inserting the insertion port side into the receiving port, the connection work is easy to perform, and in the unlocking, the stopper claw and the unlocking groove are aligned once. The action of pulling the stopper claw along the unlocking groove and the action of rotating the pipe and sliding the tip of the stopper claw are the first to overlap to unlock, so there is very little chance that the pipe will accidentally come off. Safety is improved.
Further, in the present invention, the clearance is not formed when connected by connecting the stopper claw by pushing the position of the stopper claw by its thickness in the receiving opening.
[Brief description of the drawings]
FIG. 1 is a perspective view of a connection device according to the present invention.
FIG. 2 is an explanatory view of locking and unlocking of the connection device according to the present invention.
FIG. 3 is an explanatory diagram of a conventional connection device.
FIG. 4 is an explanatory diagram of locking and unlocking of a conventional connection device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Insertion port 10a Outer peripheral surface 11 Circumferential groove 12 Unlocking groove 13 Guide groove 14 Engagement wall 15, 15a Slope 20 for unlocking Receiving port 20a Inner peripheral surface 21 Stopper claw 21a Stopper claw tip 22 Relief

Claims (1)

a. Forming the circumferential groove 11 on the outer peripheral surface that slightly enters the tube axis direction from the groove on the insertion port 10 side of the air supply / exhaust pipe,
b. The guide groove 13 is formed in parallel with the tube axis of the insertion port 10 from a part of the circumference of the circumferential groove 11 toward the groove direction.
c. The engaging wall groove 14 is formed so as to form a T shape with the guide groove 13 in a direction perpendicular to the guide groove 13, following the tip of the guide groove 13 on the groove side.
d. Both ends of the engagement wall groove 14 are raised to the same height as the outer peripheral surface of the insertion port 10 via the slopes 15 and 15a.
e. A stopper claw 21 whose tip 21a faces away from the inlet direction of the receiving port 20 and is inclined in the tube axis direction is attached to the inner peripheral surface 20a of the receiving port 20 of the air supply / exhaust pipe into which the insertion port 10 is inserted. thing,
f. The inner peripheral surface 20a of the insertion port 10 on which the stopper claw 21 is attached is formed with a relief 22 in the radial direction by at least the plate thickness of the stopper claw 21;
g. A connection device for an air supply / exhaust pipe characterized by the above .

Images