JPH0742885A - Loose flange structure of pipe - Google Patents

Abstract

PURPOSE:To provide a loose flange structure in which a loose flange can be rotatably secured to the end portion of a pipe temporarily with ease so that the flange does not detach from the pipe during transportion or plumb piping and that positioning of bolt holes is facilitated, and which can be applied in either a resin or metal pipe. CONSTITUTION:A flange portion 1a for regulating the position of one end of a loose flange 2 is formed at one end of a socket short pipe 1 made of resin, and ribs 3...3 for temporarily securing the loose flange in place, each of which has a maximum outside diameter D1 slightly greater than the bore d1 of the center small hole 2a1 of the loose flange 2, are provided on the outer peripheral portion of the pipe on the back 1a' of the flange portion 1a, and the loose flange 2 is forcibly fitted into each of the ribs 3...3 and thus rotatably held in place temporarily.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe having a loose flange on the outer periphery of its end, and more particularly to a loose flange structure of a pipe applicable to both a synthetic resin pipe (hereinafter referred to as a resin pipe) and a metal pipe.

[0002]

2. Description of the Related Art For example, a pipe provided with a movable flange, that is, a loose flange, from the viewpoint of workability when connecting pipes to each other or connecting pipes and devices through a flange portion. May be used.

However, in this type of pipe, since the loose flange is generally movable not only in the circumferential direction but also in the axial direction, the loose flange may fall off from the pipe during transportation or during pipe construction. Or, the piping work may be rather troublesome. For example, when connecting two pipes in order from the lower side in the vertical direction, in order to prevent the loose flange on the upper side of the upper pipe from dropping, the loose flange on the upper side is dropped to the lower side in advance, and In this condition, it is necessary to fasten both the loose flange bolt holes on the lower side to the bolt holes on the loose flange on the lower pipe and fasten them together. Since the loose flange on the upper side needs to be moved up during fastening, the fastening work becomes extremely troublesome.

Therefore, in order to prevent such movement of the loose flange in the axial direction of the pipe, for example, the actual opening of Sho 55-66.
Japanese Patent No. 282 proposes a flange structure in which a short pipe is interposed between the pipe and the loose flange, and the loose flange is sandwiched between both ends of the short pipe. As shown in FIG. 23, a short pipe 101 having a flange portion 101a at one end is attached to the outer periphery of the end of the pipe 100 to be joined, and a loose flange 102 is fitted to the outer periphery of the short pipe 101. In this state, the flange 101a is formed by forming the enlarged diameter portion 101b for preventing the flange from coming off at the other end of the short pipe 101.
And the loosened flange 10 rotatably between the enlarged diameter portion 101b and
2 is attached.

Further, for example, Japanese Utility Model Laid-Open No. 2-3717 discloses an end flange structure of an exhaust pipe of an automobile or the like in which the flange can be fixed without using the short pipe as described above. This is a bulge portion 200 called a bead portion at a position apart from one end of the pipe 200 by a predetermined amount.
b is provided, a flange 202 is fitted to the outer circumference of the tube between the bulge portion 200b and the one end, and in that state, the one end is expanded by a jig, and further that portion is pressed toward the bulge portion 200b to caulk. As a result, a flange portion 200a called a flare portion is formed at the pipe end, and the flange 20 is provided between the flange portion 200a and the bulge portion (bead portion) 200b.
It is fixed by sandwiching 2.

[0006]

However, in the conventional flange structure as described in the above publication, the end portion of the pipe is swaged to form a flange portion at the pipe end and a predetermined amount therefrom. Since the flange is sandwiched between the bulging portion or the enlarged diameter portion formed at a distance, it is necessary to carry out the caulking process as described above with the flange attached to the pipe. Can be applied only to metal pipes that can form bulges and expanded diameters,
There is a problem that it cannot be used for resin pipes.
In particular, the flange structure described in Japanese Utility Model Laid-Open No. 2-3717 discloses the above-mentioned problem in order to deal with the problem that the welded part is deteriorated in strength or corroded when the flange is fixed to the pipe end by welding. Since the flange is fixed by such caulking, this is a technique for realizing a fixed flange structure, rather than a flange structure having a rotatable loose flange at the pipe end.

As described above, in the prior art, although there is a technique for attaching a flange separate from this to the end of the metal pipe, the loose flange to be attached to the end of the resin pipe can be moved in the axial direction. The reality is that there is no technology that allows rotation in the circumferential direction while limiting movement.

The present invention addresses such a situation, and as a loose flange structure applicable not only to metal pipes but also to resin pipes, the flange does not fall off from the pipe during transportation or during vertical piping, and An object of the present invention is to provide a loose flange structure in which a loose flange can be rotatably and easily temporarily attached to an end portion of a pipe so that a bolt hole can be easily aligned.

[0009]

In order to achieve the above object, the first, second and third inventions of the present application each have a loose flange structure for a pipe in which a loose flange is provided on the outer periphery of one end of It is characterized in that it is configured as follows.

That is, according to the first aspect of the invention, a flange portion is formed at one end of the pipe for restricting the position of the loose flange on the one end side, and a maximum outer diameter dimension is loose on the outer peripheral portion of the pipe on the back side of the flange portion. A rib for temporarily fixing the loose flange slightly larger than the inner diameter of the flange is provided, and the loose flange can be forcibly fitted to this rib.

According to a second aspect of the present invention, a flange portion is formed at one end of the pipe for restricting one end position of the loose flange, and a groove is circumferentially formed at an outer peripheral portion of the pipe located near the back surface side of the flange portion. Then, a ring for temporarily fixing the loose flange for restricting the displacement of the loose flange toward the other end of the pipe is detachably mounted in the groove.

The ring in this case is, for example, a C type,
Although an O-shaped ring, a U-shaped ring, or the like can be used, it is needless to say that any other shape can be used as long as the displacement of the loose flange can be restricted.

Further, according to a third aspect of the present invention, a flange portion is formed at one end of the pipe for restricting one end position of the loose flange, and
A convex portion for loose flange temporary fixing is provided on the outer peripheral portion of the pipe located near the back surface side of the flange portion, and this convex portion allows the loose flange to pass through when the loose flange is set on one end of the pipe and The outer diameter dimension is slightly larger than the inner diameter of the loose flange so that the displacement of the loose flange toward the other end of the pipe can be regulated after the passage.

[0014]

According to the structure of the first invention of the present application, the rib having the maximum outer diameter dimension slightly larger than the inner diameter of the loose flange is provided on the outer peripheral portion of the pipe on the back side of the flange portion formed at one end of the pipe. Therefore, by forcibly fitting the loose flange to this rib, the loose flange can be temporarily fixed while the position of the one end side thereof is restricted by the flange portion. This allows
Not only to prevent loose flange from falling off one end of the pipe,
For example, it is possible to effectively prevent the loose flange from dropping during vertical piping.

Moreover, since the loose flange is only temporarily fixed to the rib having the maximum outer diameter dimension slightly larger than the inner diameter by force fitting, the loose flange should be connected to other pipes or equipments. By loosening the fitted state and rotating the loose flange about the tube axis by a predetermined amount, the bolt holes can be aligned.

Further, according to the structure of the second invention of the present application, a groove is formed in the circumferential direction on the outer peripheral portion of the pipe near the rear surface side of the flange portion formed at one end of the pipe, and the ring is attached to the groove. Therefore, the position of the loose flange on the one end side is regulated by the flange portion, and the displacement in the other end direction is regulated by the ring. Therefore, the loose flange is held in a rotatable state between the collar portion and the ring. As a result, the loose flange is prevented from dropping during vertical piping and the bolt holes can be aligned.

Further, according to the third invention of the present application, when the loose flange is set by passing the convex portion provided on the outer peripheral portion of the pipe near the rear surface side of the flange portion formed at one end of the pipe,
Since the position of the one end side of the loose flange is regulated by the collar portion and the displacement in the other end direction is regulated by the convex portion, the loose flange is rotated between the convex portion and the collar portion. It will be kept movable. Therefore, also in this case, the loose flange can be prevented from dropping during vertical piping and the bolt holes can be aligned.

Then, according to any of the inventions of the present application,
Unlike the conventional flange structure, which can be applied to metal pipes but cannot be applied to resin pipes, the loose flange can be easily rotatably and temporarily temporarily fixed without crimping the end of the pipe. Also, it can be applied to any of resin pipes. In addition, the temporary work of loose flange can be easily performed when necessary, and there is no need to additionally interpose a short pipe for flange mounting between the pipe and the loose flange.

[0019]

EXAMPLES Examples of the present invention will be described below. [First Embodiment] FIG. 1 shows a loose flange structure for a pipe according to the present invention, FIG. 2 is an exploded view thereof, and FIG. 3 is a left side view showing only the loose flange alone.

As shown in these figures, in the loose flange structure according to the present embodiment, a ring-shaped loose flange 2 is fitted to the outer periphery of an end portion of a resin-made receptacle short tube 1 having a flange portion 1a formed at one end. This is the configuration.

The loose flange 2 is provided with the short pipe 1 described above.
A central hole 2a for fitting into is formed and a plurality of bolt holes 2b ... 2b through which fastening bolts (not shown) are inserted. Also,
A step portion 2c is provided on the peripheral surface of the central hole 2a of the loose flange 2, that is, the inner surface of the loose flange, and one end side from the step portion 2c is slightly larger than the outer diameter of the collar portion 1a of the short pipe 1. The large diameter portion 2a ₁ has a hole diameter, and the other end side is a small diameter portion 2a ₂ having a hole diameter smaller than that of the large diameter portion 2a ₁ .

In this loose flange structure, as a characteristic part of the present invention, a plurality of pipes (in the example shown in FIG. Ribs 3 ... 3 are provided. In the present embodiment, these ribs 3 ... 3 are provided at positions of 90 ° when viewed from the axial direction of the short pipe 1, and the ribs are provided from the outer peripheral position on the other end 1b side of the short pipe 1 to the collar portion. 1a, a taper portion 3a formed so that the outer diameter increases, and a straight portion 3b continuous from the end of the taper portion 3a on the large diameter side to the back surface of the collar portion 1a while keeping the outer diameter constant. Have.

Of these, the straight portion 3b has an outer diameter
D₁Is the small diameter portion 2a of the loose flange central hole 2a.₂of
Pore diameter d₁Slightly larger than (eg d₁<D₁
≤d ₁+0.5 [mm]) and the
Length t₁Is the small diameter portion 2a₂The longitudinal dimension of
Thickness t₂Almost the same size as (t₁≒ t₂) Is set to
ing. From the other end 1b side of the short pipe 1, loose franc
From the tapered portion 3a of the rib 3 to the straight portion 3b.
Loosen when inserted in the direction of arrow A in Fig. 1 along
Central hole small diameter portion 2a of lunge 2₂The inner surface of the rib is the rib 3
It is forcibly fitted while slidingly contacting the door portion 3b, and at the center
Large diameter part 2a₁Inner surface of the short pipe collar 1a is slightly
The large diameter portion 2a is fitted with a gap₁And small diameter
Part 2a₂The step portion 2c at the boundary with the back surface 1a 'of the collar portion 1a
The end portion of the short pipe 1 on the side of the collar portion 1a by contacting the
The flange 2 is temporarily fixed.

According to this structure, the outer diameter D ₁ of the straight portion 3b of the rib 3 formed on the outer peripheral portion of the short pipe 1 is smaller than the hole diameter d ₁ of the central hole small diameter portion 2a ₂ of the loose flange 2. Since it has a large size, the loose flange 2
1 from the taper portion 3a side of the rib 3 toward the short pipe flange portion 1a side in the direction of arrow A in FIG. 1 and forcefully fitted to the straight portion 3b, whereby the loose flange 2 is provided at the outer peripheral position of the stopper portion 3a. Can be temporarily stopped.
At this time, the loose flange 2 has a large diameter portion 2a _{1 in} its central hole.
Is fitted on the outer periphery of the short pipe collar 1a with a slight clearance, and in that state, the step portion 2c in the central hole 2a abuts the back surface 1a 'of the collar portion 1a, so that from the side of the collar portion 1a. There is no way out. This eliminates the inconvenience that the loose flange 2 falls off or falls from the flange portion 1a side of the short pipe 1 during transportation or during piping.

Moreover, the loose flange 2 has an outer diameter dimension D slightly larger than the hole diameter d ₁ of the small diameter portion 2a ₂ of the central hole.
_Since it is only temporarily fixed to the straight portion 3b of the rib 3 having ₁ by force fitting, the loose flange 2 is attached to the taper portion 3a side of the rib 3 when connecting with other pipes or devices. The bolt holes 2b can be easily aligned by rotating the bolt holes 2b by a predetermined amount while the fitting state is loosened by moving the pipes.

In this embodiment, the straight portion 3b of the rib 3 has a constant outer diameter and the dimension is slightly larger than the diameter of the small diameter portion 2a ₂ of the central hole of the loose flange 2, so that the short diameter is shortened. Although the loose flange 2 is rotatably temporarily fixed to the flange portion 1a side of the pipe 1, the straight portion is formed in a gentle taper shape so that the outer diameter slightly increases as it approaches the short pipe flange portion. May be. With this configuration, the loose flange that is forcedly fitted to the rib can be easily loosened, so that the loose flange can be relatively easily rotated when the bolt holes are aligned. [Second Embodiment] FIG. 4 shows a loose flange structure for a pipe according to a second embodiment of the present invention, FIG. 5 is an exploded view thereof, and FIG. 6 is a partially omitted view thereof.

As shown in these figures, a flange part 11a is also formed at one end of the resin-made receiving port short pipe 11 according to this embodiment, and an annular loose flange 12 is formed on the outer periphery of the flange part 11a side. The loose flange 12 is fitted with a central hole 12a for inserting a short pipe and a plurality of bolt holes 12b ... 12b for inserting fastening bolts. And the central hole 1 of the loose flange 12
2a is a large diameter portion 12a ₁ having a hole diameter slightly larger than the outer diameter of the collar portion 11a of the short pipe 11 from the step portion 12c provided on the inner surface of the loose flange, and the other end side thereof. The small diameter portion 12a ₂ has a smaller hole diameter than the large diameter portion 12a ₁ . These points are the same as the case of the first embodiment, but the following configuration is different from the first embodiment.

That is, in the short pipe 11 in this embodiment, a predetermined amount (thickness t ₄ +1 to 2 mm of the central hole small diameter portion 12a ₂ of the loose flange 12) from the back surface 11a 'of the collar portion 11a to the other end 11b. ) t ₃ only away outer peripheral portion circumferentially recessed groove 11c is formed, C-shaped ring 13 for the loose flange temporary fixing is mounted detachably on the groove 11c. As shown in FIG. 6, the C-shaped ring 13 has a predetermined outer diameter D ₂ when mounted in the concave groove 11c of the short tube 11, and this outer diameter D ₂ is the small diameter of the central hole of the loose flange 12. a predetermined amount than the diameter d ₂ parts 12a ₂ (e.g., 2.0 to 4.0 mm) is greater dimension only. Then, the central hole large diameter portion 12a of the loose flange 12 is fitted to the collar portion 11a of the short pipe 11 as shown by a chain line in FIG. 6, and then the C-shaped ring is inserted into the groove 11c as shown by a solid line in the figure. By mounting 13, the one end position of the loose flange 12 is restricted by the collar portion 11a of the short pipe 11, and the other end 1
The C-shaped ring 13 regulates the displacement in the direction of 1b.

According to this structure, the recessed groove 11 is formed after the loose flange 12 is fitted to the collar portion 11a of the short pipe 11.
By attaching the C-shaped ring 13 to c, the collar part 1
The loose flange 12 can be rotatably held between the 1a and the C-shaped ring 13. Therefore, it is possible to prevent the loose flange 12 from falling off or falling during transportation or during piping, and when connecting with other pipes or devices,
By rotating the loose flange 12 around the tube axis by a predetermined amount, the bolt holes can be easily aligned. [Third Embodiment] FIG. 7 shows a loose flange structure of a pipe according to a third embodiment of the present invention, FIG. 8 shows an exploded view thereof, and FIG. 9 shows a right side view of a short pipe which is a component thereof. Shown in FIG.
[Fig. 4] is a left side view of a loose flange which is also a component.

As shown in these figures, in the resin-made receiving port short pipe 21 according to the present embodiment, a predetermined amount (the central hole 2 of the loose flange 22 from the rear surface 21a 'of the collar portion 21a at one end thereof).
Thickness dimension t ₆ +1 to 2 m of the small diameter portion 22 a ₂ in 2 a
m) multiple protrusions 23 in the circumferential direction on the outer circumference of the pipe.
・ 23 is formed.

These protrusions 23 ... 23 are, in the illustrated example,
They are spaced 90 ° apart from each other.
And the dimension between the tips of the protrusions 23 located on opposite sides,
That is, the tip outer diameter dimension D₃'Is of the loose flange 22
Central hole small diameter portion 22a₂Hole diameter d ₃Slightly more (eg
For example, 1.0-2.0 mm) is a large size (
Therefore, d₃<D₃’). And the other end 2 of the short pipe 21
The loose flange 22 fitted to the outer peripheral portion of the pipe from the 1b side
Loose flange 2 when it is pushed toward flange 21a
2 central hole small diameter portion 22a₂Overcame each of the above protrusions 23
Central hole large diameter portion 22a of loose flange 22₁Is Tsubabu 2
1a is fitted, and in that state, the loose flange 22 is in the axial direction.
Of displacement is restricted by the flange 21a and the protrusions 23, and
It is designed to be temporarily fixed in a movable state.

According to this structure, the loose flange 22 fitted to the short pipe 21 is pushed into the flange 21a side to pass the projections 23 ... 23, so that the flange 21a of the short pipe 21 is passed. Since the loose flange 22 can be rotatably temporarily fixed to the outer peripheral portion of the side by one-touch,
It is possible to prevent the loose flange 22 from dropping or dropping during transportation or during piping, and at the time of connecting with other pipes or equipment, rotate the loose flange 22 around the pipe axis by a predetermined amount, and thereby each bolt is rotated. Positioning of the holes 22b can be easily performed.

In this embodiment, four projections 23 ... 23 are provided on the outer peripheral portion of the short tube 21 at equal intervals, but the number of such projections may be four or more, or may be less. It does not have to be provided at equal intervals. Further, an annular projection may be formed so as to be continuous in the circumferential direction.

Such a protrusion may be formed integrally with the short tube, or may be separately formed and subsequently attached. This point is the same in the following fifth and sixth embodiments. [Fourth Embodiment] FIG. 11 shows a loose flange structure of a pipe according to a fourth embodiment of the present invention, FIG. 12 is an exploded view thereof, and FIG. 13 is a right side view of a short pipe which is a component thereof. FIG. 14 is a left side view of the loose flange.

In this case, the short pipe 31 has a predetermined amount in the direction from the back surface 31a 'of the flange portion 31a formed at one end to the other end 31b (the thickness of the small diameter portion 32a ₂ in the central hole 32a of the loose flange 32). A plurality of protrusions 33, 33 are formed on the outer peripheral portion of the tube separated by t ₈ +1 to 2 mm).
The respective protrusions 33, 33 are provided at an interval of 180 ° from each other in the illustrated example, and the protrusions 3 located on opposite sides to each other.
Dimension between 3 tip, i.e. slightly even tip outer diameter D ₅ than an inner diameter d ₄ of the central bore diameter portion 32a of the loose flange 32 (e.g., 1.0 to 2.0 mm) is a large size. Further, one end of the central hole 32a of the loose flange 32 has a large diameter portion 32a ₂ . The process up to this point is almost the same as that of the third embodiment, but the following points are different.

That is, in this embodiment, each of the projections 3 is
3 on the inner surface of the small diameter portion 32a of the central hole of the loose flange 32, the cutout grooves 32a ₂ ′, 32 having the same number as the projections 33 and extending in the length direction of the hole.
a ₂ 'is provided. These notch grooves 32a ₂ ′,
The depth of 32a ₂ ′ is set to be slightly larger than the height from the base end (outer peripheral surface of the short pipe) to the tip of the projection 33 in the short pipe 33.

Here, the inner diameter d ₄ of the small diameter portion 32a ₂ of the loose flange center hole and both of the cutout grooves 32a ₂ ', 32
The size relationship between the radial dimension d ₄ ′ between the bottom portions of a ₂ ′, the outer diameter D ₄ of the short tube 31, and the dimension between the tips of the protrusions 33, 33 (that is, the tip outer diameter dimension) D ₄ ′ is shown. And D ₄ <d ₄ <D
_4, which is a '<d _4'. In addition, the back surface 31 of the collar portion of the short pipe 31
The size relationship between the dimension t ₇ from a ′ to the protrusion 33 and the thickness dimension t ₈ of the loose flange central hole small diameter portion 32a ₂ is t ₈ <t ₇ .

According to this structure, the protrusions 33, 33 provided on the outer peripheral portion of the short pipe 32 are aligned with the cutout grooves 32a ₂ ′, 32a ₂ ′ in the loose flange 32, and the loose flange 32a ₂ ′, 32a ₂ ′ is aligned with the loose flange. 32 is the collar portion 31 of the short pipe 32.
Inserting in the direction of a, passing each protrusion 33, and rotating the loose flange 32 after passing through each, so that the loose flange 32 is rotatably temporarily fixed between the flange portion 31a and each 33 protrusion. You can Therefore, the third
As in the case of the embodiment, the loose flange 32 can be prevented from falling off or dropping during transportation or during piping, and at the time of connection with other pipes or equipment, the loose flange 3
By rotating 2 around the tube axis by a predetermined amount, the bolt holes 32b ... 32b can be easily aligned. [Fifth Embodiment] FIG. 15 shows a loose flange structure for a pipe according to a fifth embodiment of the present invention, FIG. 16 is an exploded view thereof, and FIG. 17 is a right side view of a short pipe which is a component thereof. FIG. 18 is a right side view of the loose flange.

In this embodiment, the collar portion 41 of the short pipe 41 is
a predetermined amount from the rear surface 41a 'of the a (thickness t ₁₀ +1 of the small diameter portion 42a ₂ in the central hole 42a of the loose flange 42).
It is the same as in the case of the fourth embodiment in that the projections 43 are formed on the outer peripheral portion of the tube which is separated by about 2 mm). However, the point that the number of the protrusions 43 is one and that the small diameter portion 42a ₂ of the central hole small diameter portion 42a _{2 of the} loose flange 42 can pass through the outer peripheral portion of the pipe where the protrusions 43 are provided. point 42a ₂ notched groove 42a ₂ formed in the 'is spiral is different from the fourth embodiment.

Here, the central hole small diameter portion 4 of the loose flange
2a₂Inner diameter d_FiveAnd the notch groove 42a ₂'Opposite bottoms
Radial dimension d between parts_FiveAnd the outer diameter D of the short pipe 41_FiveAnd its
Outer diameter at the tip of the protrusion 43 provided on the outer peripheral portion
Law D_FiveThe magnitude relationship with_Five<D_Five<D_Five’<D
_Five’ Also, measure from the back of the collar part of the short pipe to the protrusion.
Method and the thickness dimension of the small diameter part of the loose flange
To show a small relationship, it is <.

In this embodiment, when the loose flange 42 is rotatably temporarily fixed to the flange portion 41a side of the short pipe 41, the protrusion 43 of the short pipe 41 and the cutout groove 42a ₂ ′ of the loose flange 42 are formed. It is necessary to pass the protrusion 43 by aligning the position and rotating the loose flange 42 in the forward direction, but after the loose flange 42 is temporarily fixed to the end of the short pipe 41 by such passage, the above-mentioned notch is formed. Since the groove 42a ₂ ′ has a spiral shape, the loose flange 42 is less likely to drop than that of the fifth embodiment. [Sixth Embodiment] FIG. 19 shows a loose flange structure for a pipe according to a sixth embodiment of the present invention, FIG. 20 is an exploded view thereof, and FIG. 21 is a right side view of a short pipe which is a component thereof. FIG. 22 is a right side view of the loose flange.

In this embodiment, a predetermined amount (thickness t ₁₂ +1 to 2 of the small diameter portion 52a ₂ in the central hole 52a of the loose flange 52) from the back surface 51a 'of the collar portion 51a of the short pipe 51 is used.
A male screw portion 53 is provided so that one end thereof is located on the outer peripheral portion of the pipe spaced apart by (mm). The axial length of the male screw portion 53 is substantially the same as the thickness of the loose flange 52. On the other hand, the central hole small diameter portion 52 of the loose flange 52
A female screw portion 52a ₂ ′ corresponding to the male screw portion 53 is provided on the inner surface of a ₂ . Then, the male screw portion 53 'is fitted to, the female threaded portion 52a _2' female screw portion 52a ₂ of the loose flange 52 of the short pipe 51 rotates the loose flange 52 advances in a direction until it passes through a male threaded portion 53 By doing so, the loose flange 51 can be rotatably temporarily fixed between the flange portion 51a and the male screw portion 53 of the short pipe 51 after the passage.

Here, the inner diameter of the small diameter portion 52a ₂ of the central hole in the loose flange 52 (inner diameter when measured at the top of the thread of the female screw portion 52a ₂ ′) d ₆ and the outer diameter D _{6 of the} short pipe 51. And the size relation of the respective dimensions of the outer diameter D ₆ 'of the thread portion of the male screw portion 53 provided on the outer peripheral portion,
₆ is a _{<d 6 <D 6 '<} d 6'. Further, the size relation between the dimension t ₁₁ from the back surface 51a of the collar portion 51a of the short pipe 52 to one end of the male screw portion 53 and the thickness dimension t ₁₂ in the loose flange central hole small diameter portion 52a ₂ is t ₁₁ <t. _Twelve .

Also in this embodiment, since the loose flange 52 can be rotatably temporarily fixed to the flange portion 51a side of the short pipe 51 as described above, the loose flange 52 is detached during transportation or during piping. 52b can be prevented from falling, and at the time of connection with other pipes or other equipment, the loose flange 52 can be rotated around the pipe axis by a predetermined amount to easily align the bolt holes 52b ... 52b. It will be possible.

[0045]

As described above, according to the first invention of the present application, by loosely fitting the loose flange to the rib formed on the outer peripheral portion of the flange portion side of the pipe, the loose outer flange portion is loosened. Since the flange can be rotatably temporarily fixed, it is possible to prevent the loose flange from falling off or falling during transportation or during vertical piping. Then, when connecting with other pipes or devices, the bolt holes can be aligned by loosening the fitted state and rotating the loose flange about the pipe axis by a predetermined amount.

According to the second invention of the present application, the loose flange can be rotatably temporarily fixed between the flange portion of the pipe and the ring mounted in the groove on the outer peripheral portion of the pipe in the vicinity of the rear surface side thereof. As a result, the loose flange can also be prevented from falling off or dropping during transportation or during vertical piping, and the bolt holes can be easily aligned during fastening.

Further, according to the third invention of the present application, the loose flange can be rotatably temporarily fixed between the flange portion of the pipe and the convex portion formed on the outer peripheral portion of the pipe near the rear surface side thereof. Therefore, like the second invention, it is possible to simultaneously prevent the loose flange from falling off or dropping during transportation or during vertical piping, and at the same time facilitate alignment of the bolt holes during fastening.

Then, according to any of the inventions of the present application,
Unlike the conventional flange structure, which can be applied to metal pipes but cannot be applied to resin pipes, the loose flange can be easily rotatably and temporarily temporarily fixed without crimping the end of the pipe. Also, it can be applied to any of resin pipes. Further, the temporary work of loose flange can be easily performed when necessary, and there is no need to additionally interpose a short pipe for flange mounting between the pipe and the loose flange.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing a loose flange structure of a pipe according to a first embodiment of the present invention, showing a state where a loose flange is temporarily fixed to one end of the pipe.

FIG. 2 is an exploded view showing a state in which a loose flange is removed (or before being attached) from the pipe in FIG. 1 in a sectional view.

FIG. 3 is a left side view of the single body showing only the loose flange as viewed from the left side of FIG.

FIG. 4 is a partially cutaway front view showing a loose flange structure of a pipe according to a second embodiment of the present invention, showing a state in which a loose flange is temporarily fixed to one end of the pipe.

FIG. 5 is an exploded view showing a state in which a ring and a loose flange are removed (or before being attached) from the pipe in FIG. 4 in a sectional view.

6 is a partially cutaway front view showing a state in which only the ring is attached to the pipe in FIG.

FIG. 7 is a partially cutaway front view showing a loose flange structure for a pipe according to a third embodiment of the present invention, showing a state in which a loose flange is temporarily fixed to one end of the pipe.

FIG. 8 is an exploded view showing a state in which the loose flange is removed (or before being attached) from the pipe in FIG. 7 in a sectional view.

FIG. 9 is a right side view of a single body showing only the pipe as viewed from the right side of FIG.

FIG. 10 is a left side view of a single body showing the loose flange as viewed from the left side of FIG.

FIG. 11 is a partially cutaway front view showing a loose flange structure for a pipe according to a fourth embodiment of the present invention, showing a state in which a loose flange is temporarily fixed to one end of the pipe.

FIG. 12 is an exploded view showing a state in which the loose flange is removed (or before being attached) from the pipe in FIG. 11 in a sectional view.

FIG. 13 is a right side view of a single body showing only the pipe as viewed from the right side of FIG.

14 is a left side view of a single body showing the loose flange as viewed from the left side of FIG.

FIG. 15 is a partially cutaway front view showing a loose flange structure for a pipe according to a fifth embodiment of the present invention, showing a state where the loose flange is temporarily fixed to one end of the pipe.

FIG. 16 is an exploded view showing a cross-section of the tube in FIG. 15 with the loose flange removed (or before attachment).

FIG. 17 is a right side view of a single body showing only the pipe as viewed from the right side of FIG.

FIG. 18 is a right side view of a single body showing the loose flange as viewed from the right side of FIG. 16;

FIG. 19 is a partially cutaway front view showing a loose flange structure for a pipe according to a sixth embodiment of the present invention, showing a state where the loose flange is temporarily fixed to one end of the pipe.

FIG. 20 is an exploded view showing a state in which the loose flange is removed (or before being attached) from the pipe in FIG. 19 in section.

FIG. 21 is a right side view of a single body showing only the pipe as viewed from the right side of FIG. 20.

22 is a left side view of the single body showing the loose flange as viewed from the left side of FIG. 20.

FIG. 23 is a partially cutaway sectional view showing an example of a conventional loose flange structure for a pipe.

FIG. 24 is a sectional view showing an example of a conventional pipe flange structure.

[Explanation of symbols]

1, 11, 21, 31, 31, 41, 51 ... Pipes (resin socket short pipes) 1a, 11a, 21a, 31a, 41a, 51a ...
Collar part 11b, 21b, 31b, 41b, 51b ... The other end of the tube 2, 12, 22, 32, 42, 52 ... Loose flange 3 ... Rib 11c ... Groove (concave groove) 13. ..Rings (C-shaped rings) 23, 33, 43, 53 ... Convex portions (23, 33, 43)
... protrusion, 53 ... male screw _{portion) d 1, d 2, d} 3, d 4, d 5, d 6 pore size ... loose flange inner diameter (center hole small hole portion) D ₁ · ·・ Maximum outer diameter of ribs D ₃ ', D ₄ ', D ₅ ', D ₆ ' ... Outer diameter of convex part

Claims (3)

[Claims] 1. A loose flange structure for a pipe, wherein a loose flange is provided on the outer periphery of one end of the pipe, wherein a flange for regulating one end position of the loose flange is formed at one end of the pipe, and the flange of the flange is formed. A rib for temporarily fixing the loose flange, which has a maximum outer diameter dimension slightly larger than the inner diameter of the loose flange, is provided on the outer peripheral portion of the rear surface side, and the loose flange can be forcibly fitted to this rib. Loose flange structure for pipes. 2. A loose-flange structure for a pipe, wherein a loose flange is provided on the outer periphery of one end of the pipe, wherein a flange for regulating one end position of the loose flange is formed at one end of the pipe, and the flange of the flange is formed. A groove is formed in the circumferential direction on the outer circumference of the pipe located near the back side, and a loose flange temporary fixing ring that restricts displacement of the loose flange toward the other end of the pipe is removable in the groove. The loose flange structure of the pipe is characterized in that it is mounted on the. 3. A loose flange structure for a pipe, wherein a loose flange is provided on the outer periphery of one end of the pipe, wherein a flange for regulating one end position of the loose flange is formed at one end of the pipe, and the flange of the flange is formed. A convex portion for loose flange temporary fixing is provided on the outer peripheral portion of the pipe located in the vicinity of the rear surface side, and this convex portion allows the loose flange to pass through when the loose flange is set on one end of the pipe and the passage thereof. A loose flange structure for a pipe, which has an outer diameter dimension slightly larger than the inner diameter of the loose flange so that the displacement of the loose flange toward the other end of the pipe can be regulated in a later state.