JPH037666Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a pipe joint that is effective when applied to the double-pipe structure supply and exhaust pipes of forced supply and exhaust type gas water heaters.

[Conventional technology]

The double-pipe structure of the supply and exhaust pipes in conventional forced supply and exhaust type gas water heaters are, for example, 300mm, 450mm, and 900mm.
Prepare three types of connecting single pipes with lengths,
Depending on the installation location of the forced air supply/exhaust type gas water heater, these connecting single pipes are appropriately combined to form an insertion connection configuration (connecting single pipes P' of the same length in Figure 8,
(Refer to the conventional example when P' and P' are connected.) Also, as a length-adjustable pipe joint, one pipe body consists of a socket part and an insertion part, and the insertion part of the pipe body The other tube has a socket part of approximately the same length and has an annular packing housed in the inner periphery of the end of the socket part, and the insertion part of one pipe body is inserted into the socket part of the other pipe body. There is one that can be slidably inserted through packing to adjust the length (see Utility Model Application No. 52-56314).

[The problem that the idea attempts to solve]

With the former described as a conventional technique, it is often not possible to obtain the length of the supply and exhaust pipes suitable for the installation location simply by combining single connecting pipes, and errors occur in the length during actual installation. Therefore, it is common practice to cut and remove one of the connecting pipes on site to adjust the dimensions. However, if the removed portion is long, it is impossible to reuse the removed portion, which is extremely wasteful in terms of materials and requires time and effort to install.

In addition, in both the former and the latter, there is no means for connecting the tube bodies or measures to prevent the connecting tube from coming out, so a secure connection cannot be achieved, and the insertion part of the tube may come off from the socket when adjusting the expansion/contraction. There was a problem that it was easy to cause the problem and the handling was inconvenient.

This idea aims to solve the conventional problems, and allows easy and secure connection of the short sliding tube in one connecting tube to the other connecting tube, and also makes it possible to extend and retract within a certain stroke range so that both connecting tubes do not come off. To provide a pipe joint that can be easily connected to piping such as supply and exhaust pipes.

[Means to solve the problem]

The structure of this invention has a pipe connection part 1 at one end via a diameter-reducing step part 8, and a sealing material fitting recess 2 at the other end.
A short slide tube 4 having a plurality of hooking claws 3 with restoring force on the inner circumferential surface is slidably inserted into one of the connecting tubes A, and a sealing material 7 to prevent slipping out is inserted into the recess 2 at the end. is fitted so that the short slide tube 4 can be slid by a fixed stroke l between the diameter-reducing step portion 8 and the sealing material 7, and is provided with a hook portion 5 at one end that locks onto the hook hook 3 to prevent it from slipping out. Insert the other connecting pipe B, which has a pipe connecting part 6 at the other end, into the one connecting pipe A while keeping it airtight with the sealing material 7 fitted into the sealing material fitting recess 2, and then This is a pipe joint in which both connecting pipes A and B are connected so that they can freely expand and contract within a certain stroke l by locking the hooking part 5 to the hooking claw 3 of the slide short pipe 4, and the pipe joint is a standard connection. By interposing it between the single pipes C and C, it is possible to easily and reliably connect, for example, a supply/exhaust pipe of a double pipe structure of a forced supply/exhaust type gas water heater.

[Effect]

According to the pipe joint of this invention, connecting pipe B is connected to connecting pipe A.
Insert the connecting tube B while keeping it airtight with the sealing material 7 fitted into the sealing material fitting recess 2, and slide the hooking portion 5 at the tip of the connecting tube B. The hook part 5 can be locked and connected inside the hook 3 by using the elasticity of the hook 3. When installing gas water heater supply and exhaust pipes, etc., this connection pipe A, B can be expanded and contracted within a certain stroke range 1 to adjust the length and be attached.

〔Example〕

An embodiment of the pipe joint according to this invention will be described below based on the drawings. In Figs. 1 to 7, A is a pipe connection part whose diameter is reduced from the diameter reduction step part 8 so that it can be fitted into one connecting single pipe C. 1 at one end and an annular sealing material fitting recess 2 at the other end into which an O-ring 7 is fitted and fixed as a sealing material 7 for preventing removal, and 4 has a hook-like engagement at the tip. It is a short slide tube in which a plurality of resilient hooks 3 with attachment pieces 3a are protruded and fixed at regular intervals on the inner circumferential surface, and the outer diameter of the short slide tube 4 is equal to that of one of the connecting tubes A. The short slide tube 4 is designed to have approximately the same diameter as the inner diameter so that when it is inserted into the connecting tube A, the short slide tube 4 can freely slide within the connecting tube A without wobbling. Connecting pipe A
Insert the short slide tube 4 into the recess 2 at the end.
A retaining O-ring 7 is fitted and fixed on.

Further, B is a hooking piece 5a which is inserted into and engaged with the above-mentioned hooking claw 3 at one end, and whose edge is bent obliquely toward the center.
The other connecting pipe has a hooking part 5 having O fitted and fixed in the sealing material fitting recess 2.
When the ring material 7 is inserted in an airtight manner, the hooking piece 5a of the hooking portion 5 at the tip presses against the hooking pawl 3 of the short slide tube 4, and the short slide tube 4 is inserted into the diameter-reducing stepped portion 8.
By being regulated in the axial direction by the latching claw 5a, the hooking claw 5a uses the elasticity of the hooking claw 3 of the short slide tube 4 to ride over the hook-shaped engaging piece 3a, and is inserted and locked into the engaging piece 3a for connection. The tube B and the short slide tube 4 are irremovably connected. Thus, the short slide tube 4 hits the diameter-reducing step 8 on the front side, and the O-ring 7 for preventing removal on the rear side.
When this occurs, movement to the left and right in the drawing is prevented, and the connecting tubes A and B can be slid within the stroke range 1 between them. Here, since the end face of the short slide tube 4 hits the O-ring 7 for preventing removal around the entire circumference, the surface pressure of the O-ring 7 is uniform and small, there is no risk of damage to the sealing material 7, and airtightness is ensured. held, both connecting pipes A and B
is connected to prevent it from coming off. As illustrated in FIGS. 4 and 5, the hooking portion 5 includes a hooking piece 5a formed by bending one end edge of the connecting pipe B obliquely toward the center. By fixing the diagonal check piece 5b to the hook so that the diagonal check piece 5b is engaged with the hook-shaped engagement piece 3a, the engagement between the hook portion 5 and the hook 3 becomes stronger. Furthermore, by lengthening one of the connecting pipes A and increasing the stroke l, the range of dimensional adjustment can be widened.

Figures 6 and 7 show examples of how the pipe joint of this invention is applied to the inner pipe for exhaust in the double pipe structure of the forced supply and exhaust type gas water heater, and 9 shows the connection. Adhesive tape is wound and affixed to the outer surface of the joint between pipe B and connecting tube C, and is wound and affixed to the outer surface of connecting tube B whose dimensions have been adjusted relative to connecting tube C and connecting tube A. . Reference numeral E designates an outer tube for air supply, which has a structure in which single connecting tubes 12 and 12 are connected to slide adjustment tubes 10 and 11, and adhesive tape 13 is wound and pasted on the outer surface of each connecting portion. Single pipes C are connected before and after the connecting pipes A and B, which are the inner pipes, and have the same connection length as the slide adjustment pipes 10 and 11, which are the outer pipes.
Although an example of connecting single pipes with different lengths may be used, in other words, in FIG. Also good.

[Effect of idea]

As explained above, with this device, simply by pushing the connecting tube B into the short sliding tube inside the connecting tube A, the connecting tube B can be engaged easily and reliably, and the short sliding tube can be connected to the reduced diameter step part 8 and the sealing material 7. Since the connecting pipes A and B can be slid between them, they can be freely expanded and contracted within a certain stroke l.

Therefore, by interposing this between the connecting single pipes C, the lengths of the connecting pipes A and B can be easily and reliably adjusted, for example, when installing a double pipe structure supply/exhaust pipe of a forced supply/exhaust type gas water heater. It is also efficient and economical. In addition, since the short slide tubes 4 of both connecting tubes A and B are engaged with a sealing material to prevent them from coming off, they are convenient to handle.
Since the entire end surface of the short slide tube 4 hits the sealing material, the sealing material 7 is not damaged, so the airtightness is not impaired, and it is especially safe to be applied to the exhaust inner pipe of a double-pipe structure supply and exhaust pipe. It has a high practical value because of its properties.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an embodiment of the pipe joint according to this invention in a separated state, Figs. 2 and 3 are sectional views showing the joint in an expanded and contracted state, and Figs. 4 and 5
The figure is a cross-sectional view of the main parts with different hooking parts, Figure 6 is a cross-sectional view of the used state, Figure 7 is a cross-sectional view taken along the line X-X in Figure 6, and Figure 8 is the conventional example used. FIG. 1...Pipe connection part, 2...Seal material fitting recess, A
...One connecting pipe, 3...Hatch claw, 4...Slide short pipe, 5...Latching part, 6...Pipe connection part, B...
The other connecting pipe, 7... sealing material, 8... diameter reducing step section.

Claims (1)

[Scope of utility model registration request] A plurality of hooking claws 3 having a restoring force are provided on the inner peripheral surface of one connecting pipe A, which has a pipe connecting part 1 at one end via a diameter-reducing step part 8 and a sealing material fitting recess 2 at the other end. The short slide tube 4 provided at the bottom is slid freely and the sealing material 7 is fitted into the concave portion 2 at the end to prevent the sliding short tube 4 from slipping out. The other connecting pipe B, which is slidable by 1 and has a hooking part 5 on one end that is fixed to the hooking claw 3 and has a pipe connecting part 6 on the other end, is connected to the one connecting pipe A. Insert the locking part 5 into the hook 3 of the slide short tube 4 while keeping airtight with the sealing material 7 to prevent it from coming out.
A pipe joint characterized in that B is connected so that it can freely expand and contract within a certain stroke l.