JP3189885U - Housing type fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a housing type joint capable of ensuring airtightness while maintaining workability. SOLUTION: A housing type pipe joint 1 for joining flared pipes 2 is provided with a pair of housings 4 and a sealing member 3 sandwiched between flared portions 2a of the pipes 2. A peripheral groove 9 into which the seal member 3 is fitted is provided together with the flare portion 2a, and the peripheral groove 9 is a fitting portion into which the introduction portions 9b provided at both ends thereof and the seal member 3 are fitted. The introduction portion 9b has a tapered wall 9c formed so that the width W2 thereof is wider than the width W1 of the fitting portion 9a, and the sealing member 3 has a hardness of 50 ° or less. It is assumed that the seal portion 5 made of a water-expandable elastomer and the deformation prevention plate 6 sandwiched between the seal portions 5 are provided. [Selection diagram] Fig. 1

Description

  The present invention relates to a housing type pipe joint.

  Conventionally, there is a pipe joint referred to as a so-called loose flange type pipe joint in order to connect a pipe used for water and sewerage. Such a pipe joint joins the said pipe | tube by inserting packing (gasket) between the flare parts of the said flare-processed said piping, and pinching the said flare part from an axial direction with a flange. Such a loose flange type pipe joint is a self-sealing type loose flange type pipe joint that can increase the sealing force of the pipe by pressing the packing against the flange from the radial direction using the water pressure in the pipe. Is known (see Patent Document 1).

  However, the loose flange type pipe joint has a problem in workability because it is necessary to sandwich the flare portion of the pipe from the axial direction with a pair of flanges and fix the flange with a plurality of bolts from the axial direction.

  On the other hand, there is a so-called housing type pipe joint. The pipe joint joins the two pipes by sandwiching a sealing member between the flare portions of the two pipes to be connected and attaching and tightening the housing from the radial direction (see, for example, Patent Document 2). . Since the housing type pipe joint is tightened from the radial direction of the flare portion, the workability is better than the loose flange type pipe joint.

Utility Model Registration No. 3152172 JP 2011-69379 A

  On the other hand, it is preferable to use a rubber having a hardness of 70 ° or higher as the seal member used in the pipe joint. This is because if a rubber with a hardness of 50 ° or less is used, cracking or the like is likely to occur due to deterioration of the rubber over time or deterioration due to compression over many years, thereby increasing the possibility of water leakage and the like. is there.

  However, in a housing-type pipe joint, in order to ensure hermeticity, when the flare part of piping is fitted into the pipe joint, the seal member is compressed into the housing while being compressed to the flare part. It is necessary to fit. Therefore, when a seal member having a high hardness is used, there is a problem that workability is extremely lowered.

  Therefore, an object of the present invention is to make it possible to ensure sealing performance while maintaining workability in a housing-type pipe joint.

  The present invention is a housing-type pipe joint for joining flared pipes, and includes a pair of housings and a seal member sandwiched between the flare parts of the pipes. And a circumferential groove into which the seal member is fitted, and the circumferential groove has an introduction portion provided at both ends thereof and a fitting portion into which the seal member is fitted, The introduction portion has a tapered wall formed so that the width thereof is wider than the width of the fitting portion, and the seal member includes a seal portion made of a water-expandable elastomer having a hardness of 50 ° or less. A housing type pipe joint having a deformation preventing plate sandwiched between the seal portions.

  In the present invention, the tapered wall of the introduction portion can be formed so as to be gradually narrowed inward in the circumferential direction. In the present invention, the introduction portion may further have a flat surface, and the tapered wall may be formed so as to be gradually narrowed radially outward. Moreover, this invention shall have the clamping part which has the flange part in the outer peripheral edge part, and the clamping part pinched | interposed by the flare part of the said piping inside this flange part. It is possible.

  Since the present invention is configured as described above, it is possible to ensure the tightness of the piping even when a sealing member having a hardness of 50 ° or less is used. Therefore, it is possible to achieve both improvement in workability and ensuring sealing performance.

1 is a side view showing a first embodiment of the present invention. It is a figure which shows the housing in 1st Embodiment of this invention, and is a figure equivalent to the II-II sectional view taken on the line of FIG. It is a figure which shows the introduction part of the circumferential groove | channel in 1st Embodiment of this invention, and is a figure equivalent to the III-III arrow line view of FIG. It is a figure which shows 2nd Embodiment of this invention, and is a figure equivalent to FIG.

  A first embodiment of the present invention will be described with reference to FIGS. The housing type pipe joint 1 (hereinafter, also referred to as a pipe joint 1) is a pipe joint used for joining the flared pipe 2. As for the piping 2, the flare part 2a is formed in the edge part.

  The pipe joint 1 includes a seal member 3 such as a packing and a gasket and a pair of housings 4. The seal member 3 includes a seal portion 5 and a deformation prevention plate 6 that is sandwiched between the seal portions 5.

  The seal portion 5 has a substantially annular flange portion 5a on the outer peripheral edge portion, and a pinching portion 5b that is pinched by the flare portion 2a when the pipe 2 is joined inside the flange portion 5a. Is formed. The clamping part 5b is a notch-shaped part formed in accordance with the shape of the flare part 2a. The seal portion 5 is formed from a water-swellable elastomer. As the water-swellable elastomer, one having a hardness of 50 ° or less is appropriately selected from the viewpoint of workability when the pipe 2 is joined. In this embodiment, it is comprised from the composition which has rubber | gum, such as natural rubber, and a water absorbing polymer as a main component. The flange portion 5 a is formed so as to be hookable on the flare portion 2 a of the pipe 2, and is provided for temporarily fixing the seal member 3 to the pipe 2 when the pipe 2 is joined.

  The deformation prevention plate 6 is provided as a core material for imparting compression resistance to the seal member 3, and the material is appropriately selected from materials that are difficult to deform when compressed by the compression force P. In the present embodiment, the deformation preventing plate 6 is made of paper having a compression resistance for a long time, but the material thereof can be appropriately changed as long as it can withstand the use of the pipe joint.

  The housing 4 has a substantially semicircular annular body 7 and extending portions 8 provided at both ends of the body 7. The extension portion 8 is provided to fix the pair of housings 4, one of which has a female screw portion 8 a and the other of which has a hole portion 8 b.

  The body portion 7 is formed with a circumferential groove 9 for fitting the seal member 3 on the inner peripheral surface thereof. The circumferential groove 9 has a fitting portion 9a formed so that the seal member 3 can be fitted, and introduction portions 9b formed at both ends thereof. The side wall of the introduction portion 9b is a tapered wall 9c. The tapered wall 9c is provided so that the width W1 of the introduction portion 9b is wider than the width W2 of the fitting portion 9a, that is, to form a fastening margin L. Further, the width W2 of the fitting portion 9a is formed to be slightly narrower than the initial width (before fitting) of the seal member 3. In the present embodiment, the tapered wall 9c is formed so as to gradually narrow toward the inner side in the circumferential direction of the housing 4, but the shape thereof can be changed as appropriate.

  When joining the pipe 2, first, the sealing member 3 is temporarily fixed by hooking the flange part 5 a to the flare part 2 a of one pipe 2, and the clamping part 5 b is further connected to the flare part of the pipe 2. The pair of housings 4 and 4 are attached from the circumferential direction of the pipe 2 by being sandwiched by 2a. At this time, the housing 4 is attached so that the female screw portion 8a of one housing 4 comes to a position facing the other hole portion 8b. Then, the housing 4 is fixed by inserting the male screw 10 from the hole 8b and screwing the male screw 10 into the female screw portion 8a.

  At this time, the seal member 3 is fitted into the fitting portion 9 a while being gradually compressed along the tapered wall 9 c of the circumferential groove 9. Thereby, after the joining is completed, the flare portion 2a of the pipe 2 is pressed against the inner surface of the circumferential groove 9 of the pipe joint 1 by the elastic force of the seal member 3, and the pipe 2 is sealed.

  The pipe 2 is joined easily by forming the seal member 3 with a water-expandable elastomer having a hardness of 50 ° or less, so that resistance when the seal member 3 is fitted into the circumferential groove 9 is reduced. It becomes possible. On the other hand, when the seal member 3 is formed of an elastomer having a hardness of 70 ° or more, this resistance becomes large, and joining of the pipe 2 becomes more difficult. In the present embodiment, since the tapered wall 9c is formed in the circumferential groove 9, this resistance is further reduced.

  Thereafter, when water or the like is caused to flow through the pipe 2, the seal portion 5 of the seal member 3 absorbs the water or the like and expands. Thereby, the sealing property of the pipe 2 is further improved. And even if a gap occurs between the seal part 5 and the flare part 2a due to long-term use, the seal part 5 expands when the water or the like enters the gap. It is blocked and water leakage is prevented from occurring. Further, even if a crack or the like occurs in the seal portion 5, the crack or the like is similarly blocked by the expansion of the seal portion 5, thereby preventing water leakage. Therefore, by using the pipe joint 1 for joining the pipes 2, it is possible to ensure good workability and long-term sealing.

  As mentioned above, although this invention was demonstrated by the said embodiment, this invention is not limited to the said embodiment, In the range which does not change the summary of invention, it can change suitably. For example, as in the second embodiment of the present invention (see FIG. 4), the introduction portion 9b can be configured by a flat surface 9d and a tapered wall 9c. In the present embodiment, the tapered wall 9 c is formed so as to become gradually narrower outward in the radial direction of the housing 4. In this way, when the pipe 2 is joined by the pipe joint 1, the pipe joint 1 is temporarily fixed to the flare portion 2 a of the pipe 2 at the portion of the flat surface 9 d, and then the male screw 10 is tightened so that the pipe It is also possible to join the pipe 2 by moving the two flare portions 2a inward along the tapered wall 9c, thereby further improving the workability. In particular, the effect is remarkable in the pipe 2 having a large diameter of 150 mm or more.

DESCRIPTION OF SYMBOLS 1 Housing type pipe joint 2 Piping 2a Flare part 3 Seal member 4 Housing 5 Seal part 5a Flange part 5b Clamping part 6 Deformation prevention plate 7 Trunk part 8 Extension part 8a Female screw part 8b Hole part 9 Circumferential groove 9a Fitting part 9b Introduction portion 9c Tapered wall 9d Flat surface 10 Male screw L Tightening allowance P Compressive force W Width

Claims (4)

A housing type pipe joint for joining flared pipes,
A pair of housings and a seal member sandwiched between the flare portions of the pipe,
The housing has a circumferential groove in which the seal member is fitted together with the flare portion,
The circumferential groove has introduction portions provided at both ends thereof and fitting portions into which the seal member is fitted, and the width of the introduction portion is wider than the width of the fitting portion. And has a tapered wall
The seal member includes a seal portion made of a water-expandable elastomer having a hardness of 50 ° or less, and a deformation prevention plate sandwiched between the seal portions.   2. The housing-type pipe joint according to claim 1, wherein the tapered wall of the introduction portion is formed so as to be gradually narrowed inward in the circumferential direction.   2. The housing-type pipe joint according to claim 1, wherein the introduction portion further has a flat surface, and the dipper wall is formed so as to be gradually narrowed radially outward.   2. The seal member according to claim 1, wherein the seal member has a flange portion at an outer peripheral edge portion thereof, and has a sandwiching portion sandwiched by a flare portion of the pipe inside the flange portion. The housing type pipe joint according to any one of 1 to 3.

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