JPH09112772A - Expansion pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a second pipe member from being pulled out relatively in relation to a first pipe member in an expansion pipe joint. SOLUTION: In a flexible expansion pipe joint 32, a ring pull-out prevention member 21 having ends is attached to the outer circumferential part of one end of the second pipe member 18 slidably inserted in a first pipe member 11. The second pipe member 18 allows to slide in relation to the first pipe member 11 in a range where the pull-out prevention member 21 slides in a slide space part 17 of the first pipe member 11, and its pull-out prevention member 21 prevents from being pulled out from the first pipe member 11 by abutting on a projecting part 16 in the first pipe member 11 side. The outer circumferential face of the pull-out prevention member 21 closely approaches or contacts with the internal circumferential face of the slide space part 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an expansion pipe joint in which a first pipe member and a second pipe member are slidably connected to each other.

[0002]

Conventionally, when a pipe for flowing water, air, or the like is used, an expansion pipe joint whose dimensions can be adjusted is used. FIG. 6 shows an example of a conventional structure of this type expansion joint.

In FIG. 6, a connection flange 2 for connecting to a pipe (not shown) is fixed to the base end portion of the first pipe member 1, and the outer periphery of the first pipe member 1 on the tip end side. A ring member 3 is fixed to the portion. On the contrary,
The second pipe member 4 is formed thinner than the first pipe member 1 and has a tip end slidably inserted into the first pipe member 1. A connection flange 5 for connecting to a pipe (not shown) is also fixed to the base end portion of the second pipe member 4. A housing 6 is attached to the tip end side of the first pipe member 1 via a ring member 3, and a rubber ring-shaped seal member 7 is provided inside the housing 6. This seal member 7
Thus, the space between the first pipe member 1 and the second pipe member 4 is sealed.

According to such an expansion joint, since the first pipe member 1 and the second pipe member 4 are slidably connected to each other, the first pipe member 1 and the second pipe member 4 are slidably connected to each other. The dimensions between the member 1 and the second tube member 4 can be adjusted.

However, in the above-mentioned conventional structure, when a force in the direction in which the first pipe member 1 and the second pipe member 4 relatively come off acts on the first pipe member 1 due to, for example, an earthquake, etc. There is a possibility that the second pipe member 4 may come off relative to the member 1. If the second pipe member 4 comes out of the first pipe member 1 in this way, water or air flowing in the pipe will leak to the outside.

Therefore, an object of the present invention is to provide an expansion pipe joint capable of preventing the second pipe member from slipping out relative to the first pipe member.

[0007]

The expansion joint of the present invention comprises:
In order to achieve the above-mentioned object, a first pipe member having an annular convex portion on an inner peripheral portion and one end of the first pipe member are slidably inserted into the first pipe member, and the first pipe member A second pipe member having a large-diameter portion at the other end that protrudes outward from the tip of the member; and a first pipe member that is closer to the tip than the convex portion of the first pipe member is. A sealing member provided to seal between the second pipe member and an outer peripheral portion of one end of the second pipe member so as to project outward from the outer peripheral surface of the second pipe member. The present invention is characterized in that it is equipped with a retaining member that is mounted and cooperates with the convex portion to prevent the second pipe member from coming off from the first pipe member.

According to this structure, the first pipe member and the second pipe member
Even if a force is applied to the pipe member of the second pipe member in such a direction that they relatively come off,
The second pipe member is prevented from coming off relative to the first pipe member by hitting the convex portion of the pipe member.

In this case, it is preferable that the outer peripheral surface of the retaining member is close to or in contact with the inner peripheral surface of the first pipe member.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of the present invention will be described below with reference to FIGS. In this first embodiment, the present invention is applied to a flexible expansion joint. In FIG. 1, a connection flange 12 for connecting to a pipe (not shown) is fixed by welding to a base end portion (left end portion in FIG. 1) of the first pipe member 11, and a tip end portion of the first pipe member 11 is provided. An O-ring accommodating groove 13 is formed on the inner side and a dust seal accommodating groove 14 is formed on the tip end side in an annular shape on the inner peripheral portion on the side. The O-ring 12 is provided on the end surface of the connection flange 12.
An O-ring housing groove 12b for housing a is formed.

Further, in the inner peripheral portion of the first pipe member 11, between the O-ring accommodating groove 13 and the dust seal accommodating groove 14, an annular intermediate convex portion 15 and an inner side of the O-ring accommodating groove 13 (see FIG. 1). The portion forming the wall on the middle left side is an annular convex portion 16, and the convex portion 16 and the intermediate convex portion 15 are formed in the portion extending from the convex portion 16 to the base end side of the first pipe member 11. The slide space 17 having an inner diameter larger than that of the slide space 17 is formed.

The second pipe member 18 has a main body formed thinner than the first pipe member 11, and one end (the left end in FIG. 1) of the second pipe member 18 is slidable inside the first pipe member 11. Has been inserted. In the second pipe member 18, a spherical portion 19 forming a large-diameter portion is fixed by welding to the other end portion (the right end portion in FIG. 1) protruding outward from the tip end portion of the first pipe member 11. Has been done.

An annular groove 20 is formed on the outer peripheral portion of one end of the second pipe member 18, and an endless annular retaining member 21 is attached to the groove 20. In this case, the retaining member 21 is attached as follows. That is,
The second pipe member 18 is inserted into the first pipe member 11 from the tip end side thereof, and the groove 20 portion of the one end portion of the second pipe member 18 is formed more than the connecting flange 12 of the first pipe member 11. It is projected to the outside (left side in FIG. 1), and in this state, the retaining ring member 21 having an end ring is attached to the groove 20 portion in a retaining state by the elastic force of the retaining member 21.

The retaining member 21 is the second pipe member 18
The outer peripheral surface of the second pipe member 18 in the mounted state, the outer peripheral surface has the outer peripheral surface of the sliding space portion 1
It is in a state of being close to or in contact with the inner peripheral surface of 7.
In this case, the fitting depth of the retaining member 21 in the groove 20 is determined by the outer peripheral surface of the retaining member 21 and the sliding space 1.
It is set to have a size larger than the gap between the inner peripheral surface of No. 7 and the inner peripheral surface of No. 7.

An O-ring 22 which constitutes a sealing member is mounted in the O-ring receiving groove 13, and the O-ring 22 makes a watertight seal between the first pipe member 11 and the second pipe member 18. It is sealed to. Further, a dust seal 23 is mounted in the dust seal housing groove 14, and the dust seal 23 prevents sand or the like from entering between the first pipe member 11 and the second pipe member 18 from the outside. I have to.

On the other hand, on the other end side of the second pipe member 18,
The hold flange 2 is located outside the spherical portion 19.
4 is arranged and this hold flange 24
A third pipe member 26 having a hold flange portion 25 forming a pair with is arranged. A connection flange 27 connected to a pipe (not shown) is fixed to an end portion (right end portion in FIG. 1) of the third pipe member 26 opposite to the hold flange portion 25.

The hold flange 24 and the hold flange portion 25 include a bolt 28 and a nut 29 screwed to the bolt 28.
The hold flange 24 and the hold flange portion 25 slidably hold the spherical surface portion 19. A packing accommodation groove 30 is accommodated in the hold flange portion 25, and the packing accommodation groove 3
At 0, a seal packing 31 for watertightly sealing between the second pipe member 18 and the third pipe member 26 is attached.

Here, the first pipe member 11 and the third pipe member 26 are made of steel pipe, and the connecting flanges 12, 2 are connected.
7. Hold flange 24 and hold flange portion 25
Is made of steel, and its surface is coated with a resin such as nylon. Also, the second pipe member 1
8, the spherical surface portion 19 and the retaining member 21 are all made of stainless steel. Therefore, each of these members is made of steel, and is stronger in strength than the one made of casting. The flexible expansion joint 32 is configured as described above.

In the flexible expansion joint 32 having the above-described structure, the first pipe member 11 and the second pipe member 18 are connected so as to be slidable relative to each other. The dimensions between the tube member 11 and the second tube member 18 and thus the third tube member 26 can be adjusted. In this case, the slidable range is the second pipe member 1
The retaining member 21 of No. 8 has such a size that it can slide in the sliding portion space 17.

The spherical portion 19 of the second tube member 18 is
Since the holding flange 24 and the holding flange portion 25 of the third pipe member 26 are slidably held,
The pipe member 18 can be bent relative to the third pipe member 26 (see FIG. 2). In this case, the swing angle α of the third pipe member 26 with respect to the center line A is about 15 degrees to one side.

Therefore, the flexible expansion joint 32 having the above-mentioned construction is used.
When the positions of the first pipe member 1 and the third pipe member 26 are relatively changed due to, for example, an earthquake in a state in which the pipes are connected to each other, the first pipe member 11 and the second pipe member The second tube member 18 is slidable with the member 18.
2 can be bent with respect to the third pipe member 26,
As shown in, the connection state between the first pipe member 1 and the third pipe member 26 can be maintained.

At this time, even if a force is applied to the first pipe member 11 and the second pipe member 18 in the direction in which they are relatively pulled out, the retaining member 21 of the second pipe member 18 and the first pipe member 18 are removed. By hitting the convex portion 16 of the pipe member 11, it is possible to prevent the second pipe member 18 from coming off relative to the first pipe member 11.

Further, in this case, when the retaining member 21 exists in the sliding space portion 17 of the first pipe member 11, the outer peripheral surface of the retaining member 21 has a sliding space portion 17.
Since it is in a state of being close to or in contact with the inner peripheral surface of the, it is possible to reliably prevent the retaining member 21 from coming off the groove 20.

3 and 4 show a second embodiment of the present invention. This second embodiment differs from the above-mentioned first embodiment in the following points. That is, in the second embodiment, two flexible expansion joints 32 of the first embodiment are connected in series. Specifically, the first pipe member 11 on the left side in the flexible expansion joint 32 on the right side in FIG.
Connection flange 12 and flexible expansion joint 3 on the left side in FIG.
2, the connection flange 12 of the first pipe member 11 on the right side
Are connected by a bolt 33 and a nut 34, and the connecting flange 27 of the third pipe member 26 in the flexible expansion and contraction pipe joint 32 on the right side and the third in the flexible expansion and contraction pipe joint 32 on the left side are connected.
The connection flanges 27 of the pipe members 26 are connected to pipes (not shown). It should be noted that the O-ring accommodating groove is not formed in the connection flange 12 at the right end of the left flexible expansion joint 32 and is flat.

According to the second embodiment, as shown in FIG. 4, the third pipe member 26 in the right flexible expansion joint 32 and the third flexible expansion pipe joint 32 in the left flexible expansion joint 32 are arranged. For the relative position change between the pipe member 26,
It is possible to cope with a larger change and a complicated change than in the case of the embodiment.

Although not shown, the flexible expansion joint 3
It is also possible to connect three sets or more of two, and in this case, it becomes possible to cope with a larger position change between both ends.

FIG. 5 shows a third embodiment of the present invention. The third embodiment differs from the first embodiment in the following points. That is, the third embodiment is different from the first pipe member 3 in the first embodiment.
5 is not flexible between the second pipe member 36 and the present invention is applied to the expansion pipe joint 37, and specifically has the following configuration.

Similar to the first pipe member 11 of the first embodiment, the first pipe member 35 has a connecting flange 38 for welding to a pipe (not shown) fixed to the base end by welding, and the tip end side. An O-ring accommodating groove 39 is formed on the inner side and a dust seal accommodating groove 40 is formed on the tip end side in an annular shape on the inner peripheral portion of.

Further, in the inner peripheral portion of the first pipe member 35, between the O-ring accommodating groove 39 and the dust seal accommodating groove 40, an annular intermediate convex portion 41 and an inner side of the O-ring accommodating groove 39 (FIG. 5). The portion forming the wall on the left side of the center is an annular convex portion 42, and the portion of the convex portion 42 and the intermediate convex portion 41 is the portion extending from the convex portion 42 to the base end side of the first pipe member 35. The slide space 43 having an inner diameter larger than that of the slide space 43 is formed.

The second pipe member 36 has a main body formed to be thinner than the first pipe member 35, and one end portion (the left end portion in FIG. 5) of the second pipe member 36 is slidable inside the first pipe member 35. Has been inserted. In the second pipe member 36, a connection flange 44 forming a large-diameter portion is fixed by welding to the other end portion (the right end portion in FIG. 5) protruding outward from the tip end portion of the first pipe member 35. Has been done. The connecting flange 44 is also connected to a pipe (not shown).

An annular groove 45 is formed on the outer peripheral portion of one end of the second pipe member 36, and an end-end annular retaining member 46 is attached to the groove 45. In this case, the retaining member 46 is mounted similarly to the retaining member 21 of the first embodiment. That is, the second pipe member 36 is inserted into the first pipe member 35 from the tip end side thereof, and the second pipe member 3 is inserted.
The groove 45 portion of one end of 6 is projected outward (left side in FIG. 5) from the connection flange 38 of the first pipe member 35, and in this state, the elastic force of the endless annular retaining member 46 is provided. By this, it is mounted in the groove 45 portion in a state where it does not come off.

The retaining member 46 is the second pipe member 36.
The outer peripheral surface of the second pipe member 36 in the mounted state, the outer peripheral surface has the outer peripheral surface of the sliding space 4
It is in a state of being close to or in contact with the inner peripheral surface of 3.
In this case as well, the fitting depth at which the retaining member 46 fits in the groove 45 is determined by the outer peripheral surface of the retaining member 46 and the sliding space portion 4.
It is set to have a size larger than the gap between the inner peripheral surface of No. 3 and the inner peripheral surface of No. 3.

An O-ring 47, which constitutes a seal member, is mounted in the O-ring receiving groove 39, and the O-ring 47 allows water-tightness between the first pipe member 35 and the second pipe member 36. It is sealed to. Further, a dust seal 48 is mounted in the dust seal housing groove 40, and the dust seal 48 prevents sand or the like from entering between the first pipe member 35 and the second pipe member 36 from the outside. I have to.

Here, the first pipe member 35 and the second pipe member 36, the connection flanges 38 and 44, and the retaining member 46.
Are made of steel, and their surfaces are coated with a resin such as nylon. From the above,
The expansion joint 37 is configured.

In the expansion joint 37 having the above structure,
Since the first pipe member 35 and the second pipe member 36 are slidably connected to each other, the dimension between the first pipe member 35 and the second pipe member 36 in the slidable range. Can be adjusted. In this case, the slidable range is such a size that the retaining member 46 of the second pipe member 36 can slide in the sliding space 43.

However, even if a force acts on the first pipe member 35 and the second pipe member 36 so that they relatively come off, the retaining member 46 and the first pipe member 36 of the second pipe member 36 are removed. By hitting the convex portion 42 of the pipe member 35, it is possible to prevent the second pipe member 36 from coming off relative to the first pipe member 35.

Also in this case, the retaining member 46 is the first
In the state in which the pipe member 35 is present in the sliding space portion 43, the outer peripheral surface of the retaining member 46 is the sliding space portion 43.
Since it is in the state of being close to or in contact with the inner peripheral surface of the, it is possible to reliably prevent the retaining member 46 from coming off the groove 45.

[0038]

According to the expansion joint of the first aspect,
Even if a force acts on the first pipe member and the second pipe member in a direction in which they relatively come off, the retaining member attached to the second pipe member and the convex portion of the first pipe member By hitting, it is possible to prevent the second pipe member from coming off relative to the first pipe member.

According to the expansion pipe joint of the second aspect, the retaining member can be prevented from coming off the second pipe member, and the second pipe member is relatively removed from the first pipe member. It will be possible to more reliably prevent the accidental occurrence.

[Brief description of the drawings]

FIG. 1 is a cutaway side view showing a first embodiment of the present invention.

FIG. 2 is a cutaway side view showing a state in which a position change occurs between both ends of a flexible expansion joint.

FIG. 3 is a view corresponding to FIG. 1, showing a second embodiment of the present invention.

FIG. 4 is a diagram corresponding to FIG. 2;

FIG. 5 is a cutaway side view showing a third embodiment of the present invention.

FIG. 6 is a cutaway side view showing a conventional configuration.

[Explanation of symbols]

11 is a first pipe member, 16 is a convex portion, 17 is a sliding space portion, 18 is a second pipe member, 19 is a spherical portion (large diameter portion),
21 is a retaining member, 22 is an O-ring (sealing member), 2
4 is a hold flange, 26 is a third pipe member, 32 is a flexible expansion and contraction pipe joint, 35 is a first pipe member, 36 is a second pipe member, 37 is an expansion pipe joint, 42 is a convex portion, 43 is A sliding space, 44 is a connecting flange (large diameter part), 46 is a retaining member, and 47 is an O-ring (sealing member).

Claims (2)

[Claims] 1. A first pipe member having an annular convex portion on an inner peripheral portion, and one end portion slidably inserted into the inside of the first pipe member, and a tip end portion of the first pipe member. A second pipe member having a large-diameter portion at the other end projecting outward from the first pipe member and the second pipe member at the tip end side of the convex portion of the first pipe member. A seal member provided so as to seal between the member and the outer peripheral surface of one end of the second pipe member so as to project outward from the outer peripheral surface of the second pipe member; An expansion joint according to claim 1, further comprising: a retaining member that cooperates with the convex portion to prevent the second pipe member from coming off from the first pipe member. 2. The expansion joint according to claim 1, wherein an outer peripheral surface of the retaining member is close to or in contact with an inner peripheral surface of the first pipe member.