JP2023037211A - Pipe joint - Google Patents

Abstract

To provide a pipe joint which can absorb misalignment of pipes to be connected with a compact space.SOLUTION: A pipe joint 1 is provided with a cylindrical elastic part 2 through which a passage 1a extends penetrating and which is formed of an elastic material. At the elastic part 2, multiple hard layered bodies 4 which enclose the outer periphery side of the passage 1a in an annular form are embedded at intervals in an extension direction of the passage 1a, and the elastic part 2 and the respective hard layered bodies 4 form a peripheral wall of the passage 1a. Misalignment S of pipes 9 to be connected to the pipe joint 1 is absorbed by elastic deformation of the elastic part 2 caused by shearing deformation of elastic layers 5 existing between the hard layered bodies 4.SELECTED DRAWING: Figure 4

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint, and more particularly to a pipe joint capable of absorbing misalignment of connected pipes in a compact space.

Piping is used in connection with various objects. Various structures for connecting pipes have been proposed (see Patent Document 1, for example). In the structure proposed in Patent Document 1, when a pipe is connected to a building or the like, the pipe is inserted through a through hole formed in the wall, and the pipe is sealed by a sealing device arranged on the outdoor side of the wall. Fix the pipe to the wall while covering the outer circumference of the pipe. This sealing device is constructed by alternately arranging annular elastic rings and annular reinforcing rings that are inserted into the pipe in the extending direction of the pipe.

In this sealing device, each elastic ring undergoes shear deformation, thereby absorbing radial positional displacement of the pipe. However, since the annular elastic ring and the annular reinforcing ring, which are much larger in diameter than the pipe, are arranged around the outside of the pipe, a correspondingly large space is required to install this sealing device. , there is room for improvement in absorbing the displacement of the connected pipes in a compact space.

JP 2014-92214 A

SUMMARY OF THE INVENTION An object of the present invention is to provide a pipe joint capable of absorbing displacement of connected pipes in a compact space.

In order to achieve the above object, a pipe joint of the present invention is a pipe joint having a cylindrical elastic portion formed of an elastic material and extending through a flow channel, wherein are embedded in the elastic portion at intervals in the direction in which the flow path extends, and the elastic portion and each of the hard layered bodies form a peripheral wall of the flow path. It is characterized by

According to the present invention, the elastic portion is elastically deformed by shear deformation of the elastic material present between the plurality of hard layered bodies embedded in the elastic portion. Therefore, when a pipe having poor flexibility is connected to a pipe joint, even if the pipe is displaced from a predetermined position, the elastic portion is elastically deformed to absorb the displacement and to can be connected to the pipe fitting. Further, since the elastic portion and each of the hard layered bodies constitute the peripheral wall of the flow path, the pipe joint can be made compact. Therefore, by using the pipe joint, it is possible to absorb the displacement of the connected pipes in a compact space.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which illustrates the piping joint of this invention by the side view. FIG. 2 is an explanatory diagram illustrating the pipe joint of FIG. 1 in a vertical cross-sectional view; FIG. 3 is a cross-sectional view taken along the line AA of FIG. 2; 3 is an explanatory diagram illustrating a state in which the elastic portion of FIG. 2 is elastically deformed; FIG. It is an explanatory view which illustrates an embodiment provided with an extension restricting member in a longitudinal section view. 6 is an explanatory diagram illustrating a state in which the elastic portion of FIG. 5 is elastically deformed; FIG. It is explanatory drawing which illustrates the embodiment which exposed the outer peripheral surface of each hard layered body to the exterior of the elastic part in the longitudinal cross-sectional view. It is explanatory drawing which illustrates the embodiment which exposed the internal peripheral surface of each hard layered body to the flow path by the longitudinal cross-sectional view. It is explanatory drawing which illustrates the embodiment which made the shape of each hard layered body circular-arc shape by side view by longitudinal cross-sectional view. FIG. 10 is an explanatory diagram illustrating a state in which the elastic portion of FIG. 9 is elastically deformed;

Hereinafter, a pipe joint of the present invention will be described based on an embodiment shown in the drawings.

A pipe joint 1 illustrated in FIGS. 1 to 3 is used to connect a pipe 9 with poor flexibility to necessary equipment or the like. Alternatively, the pipe joint 1 is used to connect pipes 9 having poor flexibility. Such a pipe 9 is made of metal, hard resin having extremely high bending rigidity, composite material of these materials, or the like.

The pipe joint 1 includes a tubular elastic portion 2 and tubular connecting portions 3 arranged on both sides of the elastic portion 2 with the elastic portion 2 interposed therebetween. The elastic part 2 and each connecting part 3 are integrated. A channel 1a extends through the elastic portion 2 and the respective connecting portions 3 . The fluid flowing through the channel 1a may be liquid or gas. A dashed-dotted line CL in the drawing indicates an axial center extending through the center of the cross section of the pipe joint 1 (flow path 1a). Therefore, the dashed-dotted line CL is also the axial center of the elastic portion 2 and the connecting portion 3, and the extending direction of the dashed-dotted line CL is the axial direction.

Pipes 9 and necessary equipment are connected to the respective connecting portions 3 . Each connecting portion 3 is generally made of metal.

The elastic portions 2 are made of an elastic material, and are softer and have lower rigidity (modulus) than the connecting portions 3 . The elastic portion 2 is made of, for example, various known vulcanized rubbers or elastomers.

A plurality of annular hard layered bodies 4 are embedded in the elastic portion 2 at predetermined intervals g in the direction in which the flow path 1a extends (that is, in the axial direction). Each hard layered body 4 annularly surrounds the outer peripheral side of the flow path 1 a and is joined to the connecting portion 3 . The hard layered body 4 is harder and has higher rigidity (modulus) than the elastic material forming the elastic portion 2 . In this embodiment, all rigid laminae 4 are of the same shape, having a simple flat toroidal shape. The hard layered body 4 can have other shapes, and hard layered bodies 4 having different shapes can be mixed.

The number of hard layered bodies 4 is about 5 to 30, for example. The thickness (layer thickness) of the hard layered body 4 is, for example, about 0.3 mm to 2.0 mm. A predetermined distance g, which is the distance between adjacent hard layered bodies 4, is, for example, 0.5 mm to 5.0 mm. Although the predetermined interval g is basically set to the same size at all positions, the size of the predetermined interval g can be varied depending on the position.

An elastic layer 5 made of an elastic material forming the elastic portion 2 is provided between the hard layered bodies 4 embedded adjacent to each other in the extending direction of the flow path 1a. That is, the hard layered bodies 4 and the elastic layers 5 are alternately arranged in the extending direction of the flow path 1a. The layer thickness of the elastic layer 5 is the size of the predetermined interval g.

In this embodiment, each hard layered body 4 is embedded in the elastic portion 2 in such a manner that the inner peripheral surface of each hard layered body 4 is not exposed to the flow path 1a. That is, the elastic portion 2 has a cylindrical inner peripheral elastic layer 6 arranged on the inner peripheral side of each hard layered body 4 . The inner peripheral elastic layer 6 is made of various known vulcanized rubbers and elastomers. Each hard layered body 4 and the inner peripheral elastic layer 6 are joined together. The elastic portion 2 and the inner elastic layer 6 can be made of the same elastic material or different elastic materials. The inner elastic layer 6 can be optionally provided. If the hard layered body 4 is made of metal, it is desirable to provide the inner peripheral elastic layer 6 to suppress corrosion of the hard layered body 4 caused by the fluid flowing through the flow path 1a.

Further, each hard layered body 4 is embedded in the elastic portion 2 in such a manner that its outer peripheral surface is not exposed to the outside of the elastic portion 2 . That is, the elastic part 2 has a cylindrical outer peripheral elastic layer 7 arranged on the outer peripheral side of each hard layered body 4 . The outer peripheral elastic layer 7 is made of various known vulcanized rubbers and elastomers. Each hard layered body 4 and the outer peripheral elastic layer 7 are joined together. The elastic portion 2 and the outer peripheral elastic layer 7 can be made of the same elastic material, or can be made of different elastic materials. The peripheral elastic layer 7 can be optionally provided. When the hard layered body 4 is made of metal, it is desirable to provide the outer peripheral elastic layer 7 in order to suppress corrosion of the hard layered body 4 caused by outside air (such as moisture).

In this pipe joint 1, the elastic portion 2 and each hard layered body 4 constitute the peripheral wall of the flow path 1a. Moreover, each connection part 3 also comprises the peripheral wall of the flow path 1a.

In order to manufacture the pipe joint 1 having the elastic portion 2 made of vulcanized rubber, a component corresponding to the elastic portion 2 is made of unvulcanized rubber, and each hard layered body 4 is embedded in this component. Then, a molded body is molded in which the respective connecting portions 3 are brought into contact with both sides of this part. Then, by vulcanizing this molded body by a known method, the pipe joint 1 in which the respective parts (members) are integrated by vulcanization adhesion can be manufactured.

The positions of the pipes 9 illustrated in FIG. 4 are already fixed, and there is a positional deviation (center deviation) S between them in a direction orthogonal to the axial direction. One pipe 9 is connected to the connecting portion 3 on one side of the joint pipe 1 , and the other pipe 9 is connected to the connecting portion 3 on the other side, and are connected to each other via the pipe joint 1 .

In the elastic portion 2, each elastic layer 5 is slightly shear-deformed in a direction orthogonal to the axial direction. The elastic portion 2 elastically deformed by accumulating the shear deformation of each elastic layer 5 absorbs the positional deviation S between the pipes 9 .

In this pipe joint 1, even if at least one of the pipes 9 has a positional shift S with respect to a predetermined position when connecting the pipes 9 having poor flexibility to the pipe joint 1, the respective elastic layers 5 are prevented from being displaced from the predetermined position. Shear deformation follows S. As a result, the elastically deformed elastic portion 2 can absorb the positional deviation S and connect the pipe 9 to the pipe joint 1 .

Since the elastic portion 2 and the respective hard layered bodies 4 constitute the peripheral wall of the flow path 1a, the pipe joint 1 does not become excessively large, which is advantageous for making the pipe joint 1 compact. . Therefore, by using this pipe joint 1, it is possible to absorb the positional deviation S of the connected pipes 9 in a compact space.

As the number of elastic layers 5 arranged in the extending direction of the flow path 1a is increased, the elastic deformation amount of the elastic portion 2 can be increased. Therefore, when the displacement S of the pipe 9 is large, the number of elastic layers 5 should be increased (in other words, the number of hard layered bodies 4 should be increased). That is, when the positional deviation S of the pipe 9 is large, a pipe joint 1 having a large number of elastic layers 5 (hard layered bodies 4) may be used.

Even if the internal pressure of the pipe 9 increases due to the fluid flowing through the flow path 1a, the shear deformation of each elastic layer 5 is slight, so the high internal pressure can be sufficiently withstood. The smaller the predetermined distance g (thickness of the elastic layer 5) between the hard layered bodies 4, the more difficult it is for the elastic layer 5 to undergo shear deformation. Therefore, in order to improve the pressure resistance of the pipe joint 1, the predetermined gap g should be reduced. That is, when the working internal pressure of the pipe 9 is high, a pipe joint 1 with a small predetermined interval g may be used.

In this embodiment, the inner elastic layer 6 is made of an elastic material that is highly resistant to the fluid flowing through the flow path 1a. Therefore, it is not necessary to change the type (specification) of the elastic material forming the elastic layer 5 according to the fluid flowing through the flow path 1a. Further, in this embodiment, the outer peripheral elastic layer 7 is made of an elastic material that is highly resistant to the outside air. Therefore, it is not necessary to change the type (specification) of the elastic material forming the elastic layer 5 according to the outside air conditions.

In the embodiment illustrated in FIG. 5 , the pipe joint 1 further has an elongation restricting member 8 attached to the outer peripheral side of the elastic portion 2 . The elongation restricting member 8 is a member that restricts elongation of the elastic portion 2 in the axial direction (extending direction of the flow path 1a). The elongation restricting member 8 substantially restricts only the extension of the elastic portion 2 in the axial direction, and does not substantially restrict displacement in other directions. The elongation restricting member 8 is made of metal, for example, and is harder and has higher rigidity (modulus) than the elastic material forming the elastic portion 2 .

In this embodiment, the connecting end portion of each connecting portion 3 with the elastic portion 2 has a flange shape with a larger diameter. The elongation restricting member 8 has a cylindrical shape that is fitted onto the elastic portion 2 by engaging with the flange-shaped portions of the respective connecting portions 3 having a larger diameter. As the elongation restricting member 8, for example, a cylindrical body that is divided into two (multiple divisions) along a dividing line extending in the axial direction is employed. The elongation restricting member 8 may have other forms as long as it can restrict the elongation of the elastic portion 2 substantially in the axial direction. The elongation restricting member 8 can be provided arbitrarily.

Depending on the site of use, an external force that pulls the elastic portion 2 in the axial direction may act on the pipe joint 1 . Although the elastic layer 5 hardly deforms even when such an external force acts, there is a risk that the elastic layer 5 will be destroyed if the external force is excessive. In this embodiment, when the elastic portion 2 is pulled by an excessive external force in the axial direction, the elongation restricting member 8 resists the external force, thereby reducing the risk of the elastic layer 5 being pulled and broken.

Since the elongation restricting member 8 does not restrict the displacement of the elastic portion 2 in directions other than the axial direction, the elastic portion 2 can elastically deform and absorb the displacement S of the pipe 9 as illustrated in FIG. 6 . Therefore, the elongation restricting member 8 does not impair the excellent effect of the elastic portion 2 . In the elongation restricting member 8, a low-friction material such as fluorocarbon resin, a rotating roller, or the like can be used for the portions (flange-shaped portions) that engage with the connecting portions 3, respectively. This is advantageous in reducing the risk of impairing the ease of elastic deformation of the elastic portion 2 due to the elongation restricting member 8 .

In the embodiment illustrated in FIG. 7 , the outer peripheral surface of each hard layered body 4 is exposed to the outside of the elastic portion 2 . That is, the peripheral elastic layer 7 is omitted from the embodiment illustrated in FIG. For example, if the hard layered body 4 is made of a material (for example, a resin material) that does not easily corrode with the outside air, it is possible to further reduce the size and weight of the pipe joint 1 with such specifications.

In the embodiment illustrated in FIG. 8, the inner peripheral surface of each hard layered body 4 is exposed to the flow path 1a. That is, the inner elastic layer 6 is omitted from the embodiment illustrated in FIG. For example, if the hard layered body 4 is made of a material (for example, a resin material) that is resistant to corrosion by the fluid flowing through the flow path 1a, such a specification can be used to further reduce the size and weight of the pipe joint 1. can also

The outer peripheral surface of each hard layered body 4 may be exposed to the outside of the elastic portion 2, and the inner peripheral surface thereof may be exposed to the flow path 1a. That is, the piping joint 1 can be made more compact and lighter by omitting the outer elastic layer 7 and the inner elastic layer 6 from the embodiment illustrated in FIG.

In the embodiment illustrated in FIG. 9, each hard layered body 4 has a shape projecting in an arc shape to one side in the extending direction of the flow path 1a in a side view. That is, this hard layered body 4 is a toric body, and has a shape curved toward one surface side of the toric body. Along with this, the elastic layer 5 also has a shape that protrudes in an arc shape to one side in the extending direction of the flow path 1a in a side view.

Although each hard layered body 4 can have the same shape, it is preferable to change the arc-shaped radius r in side view according to each arrangement. Specifically, as exemplified in FIG. 9, each hard layered body 4 preferably has an arc shape having a radius r centered on one bending center P on the axis CL. That is, the radius r is increased as the hard layered body 4 is arranged at a position farther from the center P of bending.

In this embodiment, the elastic layer 5 undergoes shear deformation along the arcuate surface of the hard layered body 4 when viewed from the side. Therefore, as illustrated in FIG. 10, the elastic portion 2 (flow path 1a) is easily elastically deformed so as to bend in a direction (the direction indicated by the arrow in FIG. 10) intersecting the extending direction of the elastic portion 2. . Therefore, the pipe joint 1 of this embodiment is useful when used with the elastic portion 2 bent and deformed in this way.

In this embodiment, the hard layered body 4 located further away from the bending center P has a larger radius r. As a result, each elastic layer 5 can be shear-deformed more smoothly along the arc-shaped surface of the hard layered body 4, and as a result, the elastic portion 2 can be more smoothly bent and deformed.

1 Piping joint 1a Flow path 2 Elastic part 3 Connecting part 4 Hard layered body 5 Elastic layer 6 Inner peripheral elastic layer 7 Outer peripheral elastic layer 8 Elongation restricting member 9 Pipe

Claims (7)

A pipe joint having a tubular elastic portion formed of an elastic material through which a flow path extends,
A plurality of hard layered bodies annularly surrounding the outer peripheral side of the flow path are embedded in the elastic portion at intervals in the extending direction of the flow path, and the elastic portion and the hard layered bodies are embedded in the elastic portion. A piping joint comprising a peripheral wall of a flow path. 2. The pipe joint according to claim 1, wherein each of said hard layered bodies is embedded in said elastic portion in a state in which each inner peripheral surface is not exposed to said flow path. 3. The pipe joint according to claim 1, wherein each of said hard layered bodies is embedded in said elastic portion in a state in which each outer peripheral surface is not exposed to the outside of said elastic portion. 4. The pipe joint according to any one of claims 1 to 3, wherein each of said hard layered bodies has a shape protruding in an arc shape to one side in the extending direction of said flow path when viewed from the side. The pipe joint according to any one of claims 1 to 4, further comprising an elongation restricting member that restricts elongation of the elastic portion in the direction in which the flow path extends. The pipe joint according to any one of claims 1 to 5, wherein each of said hard layered bodies is made of metal. The pipe joint according to any one of claims 1 to 6, wherein each of said hard layered bodies is made of resin.

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