JPH11336965A - Connecting device for fluid pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent generation of excess/deficiency in a tightening amount of a tightening member inserting one fluid pipe in the other fluid pipe and tightened. SOLUTION: When a tightening screw pipe (tightening member) 7 externally fitted to a gas supply pipe (fluid pipe) 5 is tightened until a lock piece 10c of an engaging member 10 mounted in a connecting screw pipe 4 in a side of a gas oven 2 is engaged with a side end face of the tightening screw pipe 7, since an engaging sound is generated by elastic restoration force of the lock piece 10c, a proper tightening amount of the tightening screw pipe 7 can be easily recognized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for connecting fluid pipes such as gas pipes, and more particularly, to an apparatus for easily connecting a fluid pipe while maintaining a sealing property. Fluid pipe connection device.

[0002]

2. Description of the Related Art When a gas stove, a gas oven, and the like are installed in a usable state, it is necessary to connect a gas introduction pipe and a gas supply pipe attached thereto.
This was performed by a connection device as shown in FIG.

That is, in FIG. 8, reference numeral 1 denotes a gas introduction pipe attached to a gas oven 2 or the like, and an elbow pipe 3 is screwed to the gas introduction pipe. One male screw portion 4a of a hollow bolt-shaped connection screw tube 4 is screwed into the opening of the elbow tube 3.

[0004] Reference numeral 5 denotes a flexible gas supply pipe. An insertion pipe section 5a having a tapered outer peripheral surface is continuously provided at a distal end thereof, and is provided on an outer peripheral surface of a base end section of the insertion pipe section 5a. Has an enlarged diameter flange 5b.

The outer diameter of the insertion tube portion 5a is
The outer diameter of the enlarged diameter flange portion 5b is such that it can be inserted into the male screw portion 4b of the connection screw tube 4 without play.

The inside diameter of a portion of the connection screw tube 4 into which the distal end portion of the insertion tube portion 5a is inserted is made slightly smaller than the inside diameter of the male screw portion 4b, and a step in which an O-ring 9 described later is pressed against these continuous portions. The part 6 is formed.

Reference numeral 7 denotes a cap nut-shaped tightening screw pipe which is slidably and rotatably fitted on the gas supply pipe 5 in the axial direction of the pipe. The inner peripheral surface of the tip is screwed into the male screw section 4b. The female screw portion 7a is a matable female screw portion 7a, and a pressing step portion 8 is formed at the back end of the female screw portion 7a so as to be able to abut on the left side surface of the enlarged diameter flange portion 5b of the gas supply pipe 5.

In order to connect the gas supply pipe 5 to the connection screw pipe 4 attached to the gas introduction pipe 1 on the gas oven 2 side, an O-ring 9 is fitted over the outer peripheral surface of the insertion pipe section 5a, and then the insertion pipe section is inserted. 5a is inserted together with the O-ring 9 into the connection screw tube 4, and the female screw portion 7a of the tightening screw tube 7 is connected to the male screw portion 4b of the connection screw tube 4.
To screw.

Then, the gas supply pipe 5 is connected to the expanded diameter flange 5.
By being pushed rightward by the pressing step 8 of the tightening screw tube 7, b is gradually pushed into the deep portion of the connecting screw tube 4.

As a result, the O-ring 9 presses against the step portion 6 and moves the outer peripheral surface of the insertion tube portion 5a in the large-diameter direction, thereby pressing the outer peripheral surface and the inner peripheral surface of the connection screw tube 4 against each other. In addition, the sealing property of the connection between the connection screw pipe 4 and the gas supply pipe 5 is maintained, thereby preventing gas leakage.

[0011]

In the above-mentioned conventional connecting device, there is no means for recognizing the amount of tightening of the tightening screw tube 7 with respect to the connecting screw tube 4; If the tightening amount is insufficient, the pressure contact force of the O-ring 9 becomes small and gas leakage occurs, and if the tightening amount is excessive, the O-ring 9 is greatly elastically deformed. , Or could be damaged.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and prevents the amount of tightening of a tightening member from being excessive or insufficient so that fluid leaks or damages a seal member. It is an object of the present invention to provide a fluid pipe connecting device capable of eliminating the problem of the fluid pipe.

[0013]

In order to achieve the above object, a fluid pipe connecting device according to the present invention comprises a tapered insertion of a tip end of another fluid pipe into an open end of one fluid pipe. The pipe portion is inserted into the outer peripheral surface thereof with an elastic sealing member fitted therein so as to be rotatable to one of the fluid pipes and move this fluid pipe to the other fluid pipe side. The two fluid pipes are connected to each other while maintaining the sealing performance by the sealing member, by screwing the cap nut-shaped tightening member into an external thread formed on the outer peripheral surface of the opening end of the other fluid pipe. In the fluid pipe connecting device, the one of the fluid pipes abuts on the outer edge of the tightening member, which is externally fitted to the other fluid pipe, in the tightening direction, thereby elastically outwardly. When deformed and the fastening member is tightened to a predetermined position Elastically restored inwardly is characterized by attaching the engagement member having an engageable locking piece on the side end face opposite to the direction tightening member tightening. According to the present invention having the above structure, when the fastening member is tightened until the locking piece of the engaging member engages with the side end surface of the fastening member, an engagement sound is generated by the elastic restoring force of the locking piece. Therefore, it is possible to easily recognize an appropriate amount of tightening of the tightening member, and there is no possibility that the amount of tightening may be excessive or insufficient.

In the above connection device, when the fastening member is tightened to a predetermined position in the vicinity of the locking piece, the opening portion into which a part of the outer peripheral portion is fitted is provided near the locking piece. It is preferable to form a part. By doing so, the locking action of the fastening member is increased.

In the above connection device, a polygonal portion is formed near the opening end of the fluid pipe on the side to which the engaging member is attached, and at least both side portions of the polygonal portion are formed at the base end of the engaging member. It is preferable to provide a pair of holding pieces having a holding hole in which can be fitted so that they can be elastically deformed outward. With this configuration, the engagement member can be easily attached and detached.

In the above connection device, it is preferable to mount a plurality of engagement members. By doing so, the loosening preventing action of the fastening member can be further increased.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. The same members as those of the above-described conventional connection device are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 1 shows a state in which a connection screw pipe 4 and a gas supply pipe 5 on the gas oven 2 side similar to the prior art are connected using the first embodiment of the present invention.

Hexagonal portion 4c of elbow tube 3 and connecting screw tube 4
2, an engaging member 10 as shown in FIG. 2 fits a mounting hole 11 formed in a base piece 10a facing downward into a male screw portion 4a of a connection screw tube 4, and Is screwed and fixed between the hexagonal portion 4 c and the elbow tube 3.

The engaging member 10 is preferably made of spring steel, stainless steel, or a hard synthetic resin having elasticity.

At the tip of the horizontal piece 10b facing the left side of the engaging member 10, a locking piece 10c which is inclined in the vertical direction toward the gas supply pipe 5 has a lower end protruding below the horizontal piece 10b. It is installed continuously.

The dimension from the lower end of the locking piece 10c to the left surface of the base piece 10a is determined by the hexagonal portion 7b of the tightening screw tube 7 when the tightening screw tube 7 is screwed into the connecting screw tube 4 without any excess or shortage. The dimension between the left end face and the right end face of the hexagonal portion 4c of the connection screw tube 4 is substantially equal.

The tightening screw tube 7 is connected to the connecting screw tube 4 as in the prior art.
As shown in FIG. 3, the upper right end line of the hexagonal portion 7b comes into contact with the locking piece 10c of the engaging member 10 and presses it upward as shown in FIG. Thereby, the horizontal piece 10b is elastically deformed upward. When the tightening screw tube 7 is still tightened, the lower end of the locking piece 10c rides over the hexagonal portion 7b and comes off the left end line, so that the horizontal piece 10b is elastically restored downward and shown in FIG. Thus, the lower end of the locking piece 10c contacts the left end surface of the hexagonal portion 7b.

At this time, since an engagement sound is generated between the engagement member 10 and the hexagonal portion 7b, further tightening of the screw tube 7 is stopped.

As a result, the O-ring 9 is pressed against the inner peripheral surface of the connection screw tube 4 and the insertion tube portion 5a of the gas supply tube 5 with an optimum pressing force.
To prevent gas leakage and damage to the O-ring 9.

Further, since the locking piece 10c is engaged with the left end face of the tightening screw tube 7, its locking is prevented.

FIG. 4 shows a second embodiment of the present invention. As shown in FIG. 5, the length of a base piece 12a of the engaging member 12 in this embodiment is slightly shortened. In addition, an opening 13 into which the upper end of the hexagonal portion 7b of the tightening screw tube 7 can be fitted is formed in the left end of the horizontal piece 12b.
At the left end of the horizontal piece 12b and the left end line of the opening 13, a locking piece 12c oriented in the oblique vertical direction as in the first embodiment is continuously provided, and the lower end thereof is in contact with the left end face of the hexagonal portion 7b. It is accessible.

As described above, the tightening screw tube 7 is connected to the connecting screw tube 4.
Gradually, the locking piece 12c becomes the hexagonal portion 7b.
And the horizontal piece 13a is elastically deformed upward,
When tightened to the optimum position, as shown in FIG. 4, the lower end of the locking piece 12c engages with the left end face of the hexagonal portion 7b by elastically restoring downward, and the hexagonal portion 7b
Is fitted into the opening 13.

If the tightening of the screw tube 7 is stopped in this state, the O-ring 9 is pressed optimally and its damage is prevented, as in the first embodiment.

After the tightening, a part of the hexagonal portion 7b is fitted in the opening 13, so that the tightening screw tube 7 is more effectively prevented from loosening.

FIG. 6 shows a third embodiment of the present invention.

In this embodiment, as shown in FIG. 7, a pair of downwardly-facing holding pieces 14b are continuously provided on both side edges of the base piece of the horizontal piece 14a of the engaging member 14, and a vertically long pair of holding pieces 14b are connected to them. A holding hole 15 is provided. At the left end of the horizontal piece 14a,
An opening 13 and a locking piece 14c similar to those in the second embodiment are formed.

The dimension between the two holding pieces 14b is determined by the connection screw tube 4
Is smaller than the maximum outer diameter of the hexagonal portion 4c, and is bent inward so that the lower end side is slightly narrower. Holding hole 15
Is such that the outer end of the hexagonal portion 4c can be fitted without any play in the tube axis direction.

When the engaging member 14 is mounted, the two holding pieces 14b are pushed into the hexagonal portion 4c from above while elastically deforming outward, and both outer ends of the hexagonal portion 4c are held in the holding holes 15a.
To fit. Then, the engaging member 14 is stably fixed to the connection screw tube 4 by the elastic force of the two holding pieces 14b.

In this state, the fastening screw tube 7 is connected to the connection screw tube 4.
Then, the O-ring 9 is pressed optimally by tightening until the locking piece 14c gets over the hexagonal portion 7b.

In the third embodiment, the engagement member 14
Since the attachment and detachment of the gas supply pipe 5 are easy, maintenance inspection and replacement work of the gas supply pipe 5 and the like can be quickly performed.

As described above, in each of the above-described embodiments, the fastening screw tube 7 which is conventionally performed by the intuition of the operator is used.
Can be easily recognized by the engagement sound of the engaging members 10, 12, 14 and the like, so that there is no possibility that the tightening amount may be excessive or insufficient, and the O-ring 9 may have an insufficient pressing force. Gas leakage and damage due to excessive gas are prevented.

The present invention is not limited to the above embodiment.

For example, in each of the above-described embodiments, two engagement members 10 may be provided to face each other as shown by the phantom line in FIG. In this case, the base piece 10a may be provided integrally with the base piece 10a or may be provided separately.

In the third embodiment, when two pieces are provided so as to face each other, the holding piece 14b may be fitted to the hexagonal portion 4c so as to overlap from the opposite side.

In the above embodiment, the engaging members 10, 12, and 14 are attached to the connection screw tube 4 on the gas oven 2 side. On the contrary, the fastening screw tube 7 on the gas supply tube 5 side is fixed. If the connection screw tube 4 can be rotated, the engagement members 10, 12, 14 may be attached to the tightening screw tube 7 side.

The present invention is, of course, applicable to the connection between fluid pipes for other gases and fluids in addition to the connection between the gas pipes described above.

[0043]

According to the present invention, the following effects can be obtained.

(A) Since the amount of tightening of the tightening member is prevented from being excessive or insufficient, there is no possibility that the fluid leaks or the seal member is damaged. Further, the tightening member is prevented from being loosened by the engaging member.

(B) According to the second aspect of the present invention, the number of locations where the fastening member and the engagement member are engaged is increased, so that the effect of preventing the fastening member from loosening is increased.

(C) According to the third aspect of the present invention, the attachment and detachment of the engagement member is facilitated, so that maintenance and inspection and replacement work of the fluid pipe can be performed quickly.

(D) According to the fourth aspect of the invention, the effect of preventing the fastening member from loosening is further increased.

[0048]

[Brief description of the drawings]

FIG. 1 is a partially cut-away longitudinal side view showing a connection end time in a first embodiment of the present invention.

FIG. 2 is an enlarged perspective view of an engagement member.

FIG. 3 is a side view showing a state during connection.

FIG. 4 is a partially cut-away longitudinal side view showing a second embodiment of the present invention at the end of connection.

FIG. 5 is an enlarged perspective view of the engagement member.

FIG. 6 is a side view of the third embodiment of the present invention at the end of connection.

FIG. 7 is an enlarged perspective view of the engaging member.

FIG. 8 is a partially cutaway longitudinal side view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gas introduction pipe 2 Gas oven 3 Elbow pipe 4 Connection screw pipe 4a, 4b Male screw part 4c Hexagonal part 5 Gas supply pipe 5a Insertion pipe part 5b Large-diameter flange part 6 Step part 7 Tightening screw pipe (tightening member) 7a Female thread part 7b Hexagonal part 8 Pressing step part 9 O-ring (seal member) 10, 12, 14 Engaging member 10a, 12a Base piece 10b, 12b Horizontal piece 10c, 12c Locking piece 11 Mounting hole 13 Opening 14b Holding piece 15 Holding hole

Claims (4)

[Claims] A tapered insertion tube at the tip of the other fluid tube is inserted into the open end of one of the fluid tubes by externally fitting an elastic sealing member on the outer peripheral surface thereof. A cap nut-shaped tightening member which is rotatably mounted on one of the fluid pipes and which is fitted outside so as to be able to move the fluid pipe to the other fluid pipe is formed on the outer peripheral surface of the open end of the other fluid pipe. In the fluid pipe connecting device, the two fluid pipes are connected to each other while maintaining the sealing property by the sealing member by being screwed into the male thread portion. By elastically deforming outward by abutting the outer edge of the tightening member on the side in the tightening direction of the tightening member externally fitted to the fluid pipe, and inward when the tightening member is tightened to a predetermined position. It is elastically restored and can be engaged with the side end surface of the tightening member opposite to the tightening direction. Connection device of a fluid pipe, characterized in that fitted with engaging members having a stop piece. 2. An opening in which a part of an outer peripheral portion of the engaging member is fitted when the tightening member is tightened to a predetermined position in the vicinity of the locking piece. The fluid pipe connection device according to claim 1. 3. A polygonal portion is formed near the opening end of the fluid pipe on the side to which the engaging member is attached, and at least both sides of the polygonal portion are fitted to the base end of the engaging member. 3. The fluid pipe connecting device according to claim 1, wherein a pair of holding pieces having possible holding holes are provided so as to be elastically deformable outward. 4. The fluid pipe connection device according to claim 1, wherein a plurality of engagement members are attached.