JPH071576Y2 - Pipe connection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a pipe connection device used for a gas appliance such as a gas instantaneous water heater or a general fluid passage.

(Prior Art) A seal packing used for a pipe connecting portion needs to be inserted from a tapered portion at the mouth of an inner diameter portion into which the seal packing is inserted with a sufficient insertion allowance, and needs to be arranged deep in the tapered portion. As means for making such a deep position, for example, there are two means shown in Japanese Utility Model Publication No. Sho 63-9831. One of them is to provide two connecting projections on the connecting pipe to hold the seal packing and to connect it. Fit a washer with a cylindrical part to the pipe, press the locking protrusion from the outside toward the inside of the connected body with the cylindrical part, and position the seal packing inside the inner diameter part of the connected body. The other one is that the seal packing is fitted near the tip between the two locking projections of the connecting pipe, and the spacer ring is fitted near the rear end so that the seal packing is deep inside the inner diameter part. It is designed to be located.

(Problems to be Solved by the Invention) In the above-mentioned conventional technique, a type in which a washer having a cylindrical portion is fitted to the connecting pipe to press the locking projection from the outside, the seal packing is directly held by the locking projection. Therefore, if the protrusion is not formed sufficiently high, the seal packing may get over the protrusion and come off from the protrusion at the time of connection.
Further, in the type in which the spacer ring is fitted adjacent to the seal packing, it is necessary to fit the spacer ring before forming the two locking projections. A molding process called stringing that compresses in the longitudinal direction to form two locking protrusions becomes difficult.

Therefore, it is an object of the present invention to provide a pipe connecting device which does not hinder the pushing of the seal packing at the time of connection and which can be inserted easily with a sufficient insertion allowance.

(Means for Solving the Problem) The means for solving the problems of the present invention has a locking projection near the tip of the connecting pipe and a seal packing fitted to the peripheral surface on the tip side from the locking projection, In a pipe connecting device in which these are inserted into an inner diameter portion of a body to be connected and a pressing force is applied to the locking projection by a fixing member, in the pipe length direction, at least beyond one side surface of the locking projection, on the outer periphery of the locking projection. It is characterized in that an extending outer ring is fitted and fixed, and a seal packing is fitted to a front portion of the connecting pipe rather than the outer ring to connect to the connected body.

(Operation) Since the above-mentioned means is provided, the seal packing can be inserted into the inner diameter portion by the length in which the outer ring extends in the axial direction from the locking projection, as compared with the case where the sealing packing is directly restrained by the locking projection. .

Embodiment An embodiment of the present invention will be described below with reference to the drawings. First
FIG. 2 and FIG. 2 show an embodiment of the present invention, in which reference numeral 1 denotes a connected body which is an inflow pipe for a gas appliance or the like, and which has an enlarged inner diameter portion 2
And a taper portion 3 for facilitating passage of the pipe inscribed portion 2a and the seal packing, and a fixing flange 4 on the outer periphery.
Equipped with. 5 is a connecting pipe connected to this, 6 is a locking projection, 7 is a seal packing, 8 is an outer ring fitted and fixed to the locking projection 6, and the fixing method is, for example, the straight connecting pipe 5 for the outer ring 8. , And the tube 5 is gripped from both sides and compressed in the longitudinal direction, forming an annular protrusion called a string, and fixing the protrusion top to the inner peripheral surface of the outer ring by pressing. In addition to this method, a method of forming the locking projection 6 and then press-fitting the outer ring 8 can be adopted.

As shown in FIG. 2, the outer ring 8 includes a cylindrical portion 8a, an inward protruding edge 8b,
It has an inner peripheral surface 8c and has a length l that can extend in the pipe length direction beyond at least one side wall of the locking projection 6. Connection tube 5
A seal packing 7 is fitted to a tip portion of the outer ring 8 in the above, and these are guided by the tapered portion 3 of the connected body 1 to be inserted into the inner diameter portion 2 and fixed by a fixing member 9 and a screw 10. When fixed in this way, the locking projections 6 come from the inner surface of the fixing member 9.
Is fixed inward by the thickness of the inward protruding edge 8b, and the seal packing 7 is positioned inward by the length 1 of the outer ring 8. As a result, the seal packing 7 is placed in the inner diameter portion which is sufficiently separated from the taper portion 3, so that a good airtight state is maintained.

The structure of the outer ring is not limited to the one described above, and various structures can be adopted. The outer ring 11 in FIG. 3 has a tapered inner peripheral surface 11a, and the outer ring 12 in FIG. The surface 12a is an arcuate surface, and the locking projections 6 are attached to the inner peripheral surfaces 11a, 12a by pressing and fixed. In FIG. 3, another locking projection 6a is provided at the tip of the locking projection 6 to prevent the seal packing from being left when the connecting pipe is removed. This locking projection 6a can be adopted in other embodiments.

In the embodiment shown in FIGS. 5 and 6, the connecting pipe is formed so that the connecting pipe can be separated and joined immediately. The connected body 1 is provided with a locking edge 13 having a diameter smaller than the flange 4 instead of the flange 4. The fixing member 14 is loosely fitted to the connecting pipe 5, and the fixing member 14
A locking edge 15 having the same diameter as the locking edge 13 is provided on the outer circumference of the. Further, the outer ring 8 is press-fitted in the direction opposite to that of the above embodiment, the inward end edge 8b contacts the seal packing 7, and the tubular portion 8a contacts the fixing member 14.

Both locking edges 13, 15 are locked by a clip 17 made of leaf spring material. The clip 17 extends from the base 18 with a pair of arcuate locking portions 19a, 19b, which are provided with guide portions 20a, 20b having a pre-opening shape at the tip thereof and punched with locking grooves 21a, 21b in the longitudinal direction. It is open. The width of the locking grooves 21a, 21b is slightly larger than the sum of the widths of both locking edges 13, 15, and the both locking edges 13, 15 are butted against each other so that the clip 17 is radially extended from the guide portions 20a, 20b side. Then, as shown in FIG. 5, both locking edges 13 and 15 are housed and integrated in the locking grooves 21a and 21b, and when the clip 17 is pulled out in the opposite direction, the respective parts are separated.

Also in this embodiment, the seal packing 7 is a fixing member.
It is positioned at the back from 14 by the length of the outer ring 8.

(Effect of the Invention) According to the present invention, the outer ring is fixed to the locking projection of the connecting pipe to receive the seal packing as described above. Therefore, the seal packing can be inserted deeply into the inner diameter hole of the connected body. It is possible to ensure airtightness. Further, since the outer ring is fixed to the locking projection, there is no risk of displacement or loss and the handling is easy. Further, since the locking projection does not support the seal packing made of a soft material, it is not necessary to have a large receiving surface, and a low ridge is sufficient, so that the locking projection is easy to process.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, FIG. 2 is an enlarged sectional view of an essential part, FIGS. 3 and 4 are longitudinal sectional views of an essential part of different embodiments, and FIG. FIG. 6 is a longitudinal sectional view of the embodiment of FIG. DESCRIPTION OF SYMBOLS 1 ... Connected object, 5 ... Connection tube 6 ... Locking protrusion, 7 ... Seal packing 8,11, 12 ... Outer ring, 9, 14 ... Fixing member

Claims (1)

[Scope of utility model registration request] 1. A connection pipe has a locking projection near the tip and a seal packing fitted from the locking projection to a peripheral surface on the tip side.
In a pipe connecting device in which these are inserted into an inner diameter portion of a body to be connected and a pressing force is applied to the locking projection by a fixing member, in the pipe length direction, at least beyond one side surface of the locking projection, on the outer periphery of the locking projection. A pipe connecting device, characterized in that an outer ring extending to the above is fitted and fixed, and a seal packing is fitted to a front portion of the connecting pipe rather than the outer ring to connect to a connected body.