JPH04258591A - Pipe connecting device - Google Patents

Abstract

PURPOSE:To hold good insertion property of a spigot, large holding force, watertightness, protect the outer end face of the spigot from corrosion, and prevent the outer end face of the spigot from abutting on the stepped face of a socket due to thermal expansion and contraction of a piping. CONSTITUTION:The pipe connecting device consists of a packing member 10 fitted in a socket 1, a press insertion member 20 capable of being pressed into the packing member 10 loaded on a spigot 7. The packing member 10 has a cylindrical body 11 having an engaging projecting part 12, a flange part 15, and a ring-shaped tongue piece 17 on the inner peripheral surface of which a ring-shaped part 18 to be engaged is provided. The press insertion member 20 is provided with a cylindrical part 21 having a ring-shaped engaging part 22 capable of pressure-contacting and engaging the ring-shaped part 18 to be engaged, a pipe receiving part 24 provided inside the outer end part of the cylindrical part 21, an expansion and contraction absorbing part 25 provided projectingly on the outer end side of the pipe receiving part 24, and a stopper part 28 provided projectingly on the inner end part of the cylindrical part 21.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe connection device interposed between a socket and a receptacle inserted into the socket.

0002

[Prior Art] Conventionally, when connecting pressure piping in, for example, a high-rise apartment complex, a socket with an inner diameter larger than the outer diameter of the pipe is formed at the end of one pipe, and the socket and the other pipe are connected to each other. A method has been adopted in which a cylindrical connection device made of an elastic material is interposed between the socket and the socket of the piping to quickly and robustly connect the socket and the socket.

[0003] An example of a connecting device used for such a connection is the connecting device disclosed in Japanese Utility Model Publication No. 55-5833. This connection device has an annular protrusion that tightly fits into an annular groove provided on the inner circumferential surface of the socket on the outer circumferential surface of the cylindrical body, and an annular protrusion that presses against the inner circumferential surface of the socket. The end has an outer end flange that presses against the outer end surface of the socket, and further includes an annular tongue piece extending diagonally inward from the outer end flange.

[0004] Then, with the connecting device fitted into the socket, the socket and the socket are connected by inserting the socket into the annular tongue piece. When the socket is inserted, the annular tongue of the connecting device is pushed apart and compressed between the socket and the cylindrical body, and the annular protrusion of the cylindrical body tightly fits into the annular groove of the socket. The annular projection was configured to be in close contact with the inner peripheral surface of the socket to maintain watertightness between the socket and the socket and a gripping force of the socket.

[0005]

[Problems to be Solved by the Invention] However, in such a conventional pipe connection device, when the outer end of the socket pushes the annular tongues apart, the corner of the outer end hits the taper of the annular tongues. There was a problem that smooth insertion was not possible because the insertion was difficult.

Furthermore, since the outer end surface of the socket passes through the piping connection device and is exposed inside the socket, the outer end surface corrodes and
In order to properly specify the insertion amount of the socket, it is necessary to put insertion limit marks on the socket. Furthermore, due to the thermal expansion and contraction of the piping, the outer end surface of the socket hits the stepped part of the socket whose diameter has been expanded.
There was a risk of abnormal noise and compressive stress being generated at the insertion port.

[0007] This invention was made to solve the above problems, and its purpose is to provide a socket with good insertability, a large gripping force, and watertightness, and to prevent the outer end surface of the socket from corroding. It is an object of the present invention to provide a pipe connection device that can prevent the outer end surface of the socket and the step surface of the socket from coming into contact with each other due to thermal expansion and contraction of the pipe.

[0008]

[Means for Solving the Problems] This invention has been made to achieve the above-mentioned object, and the piping connection device of the first invention is provided between a socket and a socket inserted into the socket. The interposed pipe connection device includes a packing member made of an elastic material and having an annular tongue extending obliquely inward, which is fitted into the socket, and a packing member which is fitted into the socket and has an annular tongue piece extending diagonally inward. This piping connection device is characterized by comprising a press-fitting member made of an elastic material that can be press-fitted into an annular tongue piece.

In the second aspect of the invention, the packing member includes a cylindrical body having an engaging protrusion capable of engaging with an engaged portion provided in the socket, and a flange that is in close contact with an outer end surface of the socket. and an annular tongue extending diagonally inward from the outer end of the cylindrical body and having an annular engaged portion on its inner circumferential surface, and the push-fitting member has the above-mentioned annular tongue on its outer circumferential surface. a cylindrical part having an annular engaging part that can press and engage with the annular engaged part of the annular tongue; and a tube receiving part provided at the outer end of the cylindrical part and in close contact with the outer end surface of the insertion port. an extensible absorbing part adjacent to the tube receiving part and protruding toward the outer end of the cylindrical part; and an elastic absorbing part protruding from the inner end of the cylindrical part and extending toward the outer end of the packing member. 2. The piping connection device according to claim 1, further comprising a stopper portion that can be brought into contact with the piping connection device.

In a third aspect of the invention, the piping connection device according to claim 1 or 2, wherein at least one of the packing member and the push-fitting member is made of a highly water-absorbing rubber material.

[0011] In the fourth aspect of the present invention, there is provided a press-fitting member made of an elastic material that can be fitted into the insertion opening and press-fitted into the annular tongue of the packing member, the annular engagement member of the annular tongue on the outer peripheral surface. a cylindrical part having an annular engaging part that can be engaged in pressure contact with the joint part; a tube receiving part provided at the outer end of the cylindrical part and in close contact with the outer end surface of the insertion port; Adjacent and protruding toward the outer end of the cylindrical portion to protect the insertion port from damage and to absorb thermal expansion and contraction of the socket side and the insertion port side when press-fitted into the annular tongue piece. The insert according to claim 2 or 3, further comprising an elastic absorbing portion and a stopper portion that protrudes outside the inner end of the cylindrical portion and can come into contact with the outer end of the packing member. Push-fit member for mouth protection.

0012

[Operation] The present invention is constructed as described above, in which the packing member is fitted into the socket, the engaging protrusion engages with the engaged part of the socket, and the flange part is fitted into the socket. The axial position is maintained in close contact with the outer end surface.

The push-fitting member is fitted into the socket, and the tube receiving portion closely covers the outer end surface of the socket to protect the outer end surface of the socket from corrosion and to control the axial position of the push-fit member and the socket. stipulate.

[0014] Then, the push-fit member fitted into the socket is fitted into the annular tongue piece of the packing member fitted into the socket. At this time, the cylindrical part of the push-fitting member slides against the annular tongue piece and is inserted by pushing the annular tongue piece apart, and the stopper part abuts the outer end of the packing member to define the insertion amount. Ru.

[0015] Furthermore, the elastic absorbing part is in contact with the stepped part of the socket and is interposed between the outer end surface of the socket and the stepped part of the socket, and prevents the outer end surface of the socket from coming into contact with the stepped part of the socket, and also prevents the piping from coming into contact with the outer end surface of the socket. Absorbs thermal expansion and contraction. Further, the annular engaged portion of the annular tongue piece and the annular engaging portion of the cylindrical portion are brought into pressure contact and engaged, and this pressure contact grips the receptacle with a large gripping force and watertightness. .

Furthermore, when at least one of the packing member and the push-fitting member is made of a highly water-absorbing rubber material, the pressure contact and engagement between the annular engaged portion and the annular engaging portion can be made even tighter through water passage. At the same time, the gripping force of the socket is increased. Furthermore, the push-fitting member can prevent damage to the socket before connection.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 are side sectional views of a packing member and a press-fitting member of the pipe connection device of the present invention.

This pipe connection device includes a packing member 10 having a cylindrical body 11, a flange portion 15, an annular tongue piece 17, and is formed to be press-fittable into the packing member 10.
It is composed of a push-fitting member 20 having a cylindrical portion 21, a tube receiving portion 24, an elastic absorbing portion 25, and a stopper portion 28.

In the embodiment, the packing member 10 is formed into a cylindrical shape from an elastic material such as CR, and includes a cylindrical main body 11, a flange portion 15 provided on the outer end side, and a flange portion 15 extending diagonally inward from the outer end side. It has an integral annular tongue piece 17.

At a predetermined position near the outer end of the outer periphery of the cylindrical main body 11, an annular engagement protrusion 12 that can be engaged with an engaged portion 4 of the socket 1, which will be described later, is provided.

An annular recess 13 is provided at a predetermined position on the outer periphery of the cylindrical body 11, and the outer diameter of the annular recess 13 is equal to that of the socket 1.
It is formed slightly larger than the inner diameter of.

Further, the flange portion 15 is formed into an annular shape with a width sufficient to cover the outer end surface of the socket 1. The annular tongue piece 17 has a groove extending diagonally inward on its inner peripheral surface, and
A plurality of annular engaged portions 18 having a fin-like cross section are formed.

The push-fitting member 20 is formed into a cylindrical shape using a highly water-absorbent rubber material, for example, SBR mixed with a super-absorbent polymer, and includes a cylindrical portion 21 and a tube receiving portion provided at the outer end of the cylindrical portion 21. 24, an elastic absorbing portion 25, and a stopper portion 28 protruding outward from the inner end.

The outer circumferential surface of the cylindrical portion 21 has a fin-shaped cross section that extends obliquely inward and can be engaged with the annular engaged portion 18 at the same pitch as the annular engaged portion 18 of the annular tongue piece 17. A plurality of annular engaging portions 22 are formed. The outer diameter of the annular engaging portion 22 is set to be slightly larger than the inner diameter of the annular engaged portion 18 provided at the outermost end of the annular tongue piece 17.

Further, an inner annular protrusion 23 having a fin-like cross section extending obliquely outward at the same pitch as the annular engaging portion 22 is formed on the inner circumferential surface of the cylindrical portion 21. The inner diameter of the protrusion 23 is set to be slightly smaller than the outer diameter of the insertion port 7.

The tube receiving portion 24 is provided inside the outer end of the cylindrical portion 21, and is formed as an annular protruding step portion having a width sufficient to cover the outer end surface of the insertion port 7.

Further, the expandable absorbing portion 25 is adjacent to the tube receiving portion 24 and protrudes toward the outer end of the cylindrical portion 21 . The inner circumferential surface of the expandable absorbing section 25 is formed with a slightly expanded diameter toward the outer end, so that the diameter of the inner circumferential surface does not become smaller than the inner diameter of the insertion port 7 due to compression of the expandable absorbing section 25. It is composed of

The stopper portion 28 is formed to protrude outward from the inner end of the cylindrical portion 21 in the shape of a flange. Also, the cylindrical part 21
A tapered part 27 for guiding the insertion of the socket 7 is formed in the inner end opening, the diameter of which increases toward the inner end.

The piping connection device constructed in this manner is interposed between the socket 1 and the socket 7, as shown in FIGS. 3, 4, and 5, to connect the two.

As shown in FIG. 3, for example, the socket 1 is formed with a larger diameter than the tube body, and an annular groove-shaped engaged portion 4 is formed at its outer end. In addition, the code|symbol 3 is an outer end surface of the socket 1, and 5 is a socket stepped part.

The socket 7 has approximately the same inner diameter as the tube body on the socket 1 side, and when connecting the socket 1 and the socket 7,
First, the packing member 10 is fitted into the socket 1. At this time, the flange portion 15 comes into close contact with the outer end surface 3 to position the packing member 10 in the axial direction. Further, the engaging protrusion 12 engages with the engaged portion 4 to prevent the packing member 10 from coming off, and the annular recess 13 is pressed against the inner peripheral surface of the socket 1. The flange portion 15, the engaging protrusion 12, and the annular recess 13 each ensure watertightness with the socket 1 (Fig. 3
reference). Note that it is desirable to apply a bonding agent or a lubricant to the annular protrusion 13 before fitting it.

On the other hand, a push-fitting member 20 is fitted into the socket 7. At this time, the stopper part 28 becomes a pulling handle during installation, and when the insertion port 7 is lightly press-fitted into the cylindrical part 21, the inner annular protrusion 23 comes into pressure contact with the outer peripheral surface of the insertion port 7, and the tube receiving part 2
4 covers the outer end surface 8 and comes into close contact with it to position the push-fitting member 20 in the axial direction (see FIG. 4). Note that it is desirable to apply a bonding agent or a lubricant to the outer circumferential surface of the socket 7 or the inner annular projection 23 for fitting.

Next, the push-fitting member 20 fitted into the socket 7 is fitted into the annular tongue piece 17 of the packing member 10 fitted into the socket 1 . When inserting the annular tongue piece 1 in advance,
It is desirable to apply a bonding agent or a lubricant to the annular engaged portion 18 of No. 7 and the annular engaging portion 22 of the cylindrical portion 21. At this time, the tip of the cylindrical portion 21 of the press-fitting member 20 is guided by the tapered portion 27 and enters the annular tongue piece 17, and is inserted by sliding against the annular tongue piece 17 and pushing it apart.

[0035] Then, the annular engaged portion 18 and the annular engaging portion 22, which are diagonally opposite to each other, engage and press against each other, and the inner annular protrusion 23 presses against the outer peripheral surface of the socket 7 (see Fig. 5). . Furthermore, the stopper portion 28
The outer end of the elastic absorbing portion 25 is in close contact with the outer end of the socket 7 to maintain watertightness and to define the insertion amount. This prevents contact with the opening part 5. When the push-fitting member 20 is immersed in water by water passage, the push-fitting member 20 swells with water and comes into close contact with the insertion port 7, and the annular engaging portion 22 is pressed into contact with the annular engaged portion 18. , making the engagement even tighter.

[0036] Furthermore, the joints applied between the annular recess 13 and the socket 1, between the socket 7 and the inner annular protrusion 23, and between the annular engaged part 18 and the annular engaging part 22 The agent or lubricant forms a pool in the concave portion of each fin-like portion, thereby ensuring further watertightness at each portion.

When the piping on the socket 1 side and the piping on the socket 7 side expand and contract due to heat, the expansion/contraction absorbing section 25 is located between the socket step part 5 and the outer end surface of the socket 7 and expands and contracts in the axial direction. The tube receiving part 24 defines the insertion end of the socket 7 and also defines the socket stepped part 5.
This prevents contact between the outer end surface of the insertion port 7 and the outer end surface of the insertion port 7. This results in
This prevents the occurrence of abnormal noise and compressive stress due to the above contact.

[0038] Immediately after cutting the pipe, the insertion port 7
By fitting the push-fitting member 20 into the pipe, the expansion/contraction absorbing portion 25 protects the socket 7 during transportation of the pipe or construction of pipe connection, thereby preventing damage to the socket 7 due to contact with other parts. be able to.

FIGS. 6 and 7 show other embodiments of the invention. In the following description, the same reference numerals are given to the same parts as those in the first embodiment, and the description thereof will be omitted. In this second embodiment, the annular tongue piece 17 of the packing member 10 is formed with a plurality of annular engaged portions 18A each having an arcuate cross section. Further, on the outer circumferential surface of the cylindrical portion 21 of the push-fitting member 20, a plurality of annular engaging portions 22A having arcuate cross sections that can be engaged with each other are formed at the same pitch as the annular engaged portions 18A. Inner annular protrusions 23A having the same pitch as the annular engaging portion 22 are formed on the inner circumferential surface of the cylindrical portion 21.
The cylindrical portion 21 has a bellows shape and is configured to be slightly expandable and contractible in the axial and radial directions.

It should be noted that the present invention is not limited to the above description and illustrated examples, and its embodiments can be modified without departing from the technical idea of the present invention. For example, the engagement protrusion 12 of the packing member 10 may have a triangular cross section. Further, the cross-sectional shape of the annular engaged portion may be triangular, square, etc., and is not particularly limited. Furthermore, the length of the cylindrical body 11 may be formed to be shorter than the length of the annular tongue piece 17.

[0041] Furthermore, the annular engaging portion 22A of the push-fitting member 20,
The inner annular projection 23A may be formed in a row of O-rings as shown in FIG. In addition, the annular engagement part is
The cross-sectional shape is not particularly limited as long as it can be press-contacted and engaged with the opposing annular engaged portion. Furthermore, by using a bonding agent between the inner peripheral surface of the cylindrical part and the outer peripheral surface of the socket,
As shown in FIG. 9, even if only an annular engaging portion is provided on the outer circumferential surface of the cylindrical portion, sufficient gripping force can be ensured.

[0042] The expansion/contraction absorbing portion may be of any type as long as it is capable of maintaining the distance between the outer end surface of the socket and the stepped portion of the socket and absorbing the expansion/contraction of the piping, and its cross-sectional shape is not particularly limited. Furthermore, the cross section of the stopper portion does not have to be circular, and the socket may of course be a socket of a pipe joint or the like.

[0043]

[Effects of the Invention] Since the piping connection device of the present invention has the above-described configuration, the packing member and the push-fitting member are fitted into the socket and the socket respectively, and the cylindrical portion of the push-fitting member is annular. Since it slides and is fitted into the tongue piece, it is possible to obtain good insertability of the insertion opening.

Furthermore, since the annular engaged portion of the annular tongue and the annular engaging portion of the cylindrical portion are pressed and engaged, the receptacle can be gripped with a large gripping force.

Furthermore, since the tube receiving portion covers the outer end surface of the insertion port, the outer end surface can be protected from corrosion. Furthermore, since the insertion amount of the socket is determined by the tube receiving part and the stopper part, it is possible to omit the trouble of marking the insertion limit on the socket, and to perform the connection work simply and quickly.

Furthermore, since the expansion/contraction absorbing part is interposed between the outer end surface of the socket and the step part of the socket, it is possible to prevent the outer end surface of the socket and the step part of the socket from coming into contact with each other, and to prevent the contact caused by thermal expansion and contraction of the piping. It is possible to prevent the occurrence of abnormal noise and stress distortion due to contact.

In addition, when the packing member and the push-fitting member are made of a highly water-absorbing rubber material, they can be brought into closer contact with the socket or insertion port by water passage, and the pressure contact between the two members can be improved. This has the effect of making the engagement even tighter.

Furthermore, by fitting the push-fitting member into the piping socket in advance, the expansion and contraction absorbing portion protects the socket during transportation or piping connection work, thereby preventing damage to the socket. It produces the effect that can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a packing member of a pipe connection device according to an embodiment of the present invention.

FIG. 2 is a side sectional view of the push-fitting member.

FIG. 3 is a side sectional view of the packing member fitted into the socket.

FIG. 4 is a side sectional view of the push-fitting member fitted into the socket.

FIG. 5 is a side cross-sectional view showing the state of connection between the socket and the socket using the piping connection device.

FIG. 6 is a side sectional view of the packing member of the second embodiment.

FIG. 7 is a side sectional view of the push-fitting member.

FIG. 8 is a side sectional view showing another example of the push-fitting member.

FIG. 9 is a side sectional view showing yet another example of a push-fitting member.

[Explanation of symbols]

1 Socket 7 Socket 10 Packing member 11　Cylindrical body 12 Engagement protrusion 15 Flange part 17 Annular tongue piece 18, 18A Annular engaged part 20 Push-fitting member 21 Cylindrical part 22, 22A Annular engagement part 24 Pipe receiving part 25　Stretchable absorption part 28 Stopper part

Claims (4)

[Claims] 1. A pipe connection device interposed between a socket and a socket inserted into the socket, the pipe connecting device comprising: an annular tongue made of an elastic material and extending diagonally inward and fitted into the socket; A piping connection device comprising: a packing member having a tab; and a press-fitting member made of an elastic material that is fitted into the insertion port and press-fitted into the annular tongue of the packing member. 2. The packing member includes a cylindrical body having an engaging protrusion that can engage with an engaged portion provided in the socket;
It has a flange portion that comes into close contact with the outer end surface of the socket, and an annular tongue piece that extends diagonally inward from the outer end side of the cylindrical body and has an annular engaged portion provided on its inner peripheral surface. , the push-fitting member includes a cylindrical portion having an annular engaging portion on an outer circumferential surface that can be engaged in pressure contact with an annular engaged portion of the annular tongue, and an outer end of the cylindrical portion. a tube receiving portion that is in close contact with the outer end surface of the insertion port; an elastic absorption portion that is adjacent to the tube receiving portion and protrudes toward the outer end of the cylindrical portion; and a retractable absorption portion that protrudes outside the inner end of the cylindrical portion. 2. The piping connection device according to claim 1, further comprising a stopper portion that can come into contact with an outer end portion of the packing member. 3. The pipe connection device according to claim 1, wherein at least one of the packing member and the push-fitting member is made of a highly water-absorbing rubber material. 4. A press-fitting member made of an elastic material that can be fitted into the insertion opening and press-fitted into the annular tongue of the packing member, the outer circumferential surface of which is pressed into contact with the annular engaged portion of the annular tongue. a cylindrical part having an annular engaging part that can be engaged with the cylindrical part; a tube receiving part provided at the outer end of the cylindrical part and in close contact with the outer end surface of the insertion port; an elastic absorbing part that protrudes toward the outer end of the cylindrical part to protect the socket from damage and is capable of absorbing thermal expansion and contraction on the socket side and the socket side when press-fitted into the annular tongue; and a stopper portion that protrudes outside the inner end of the cylindrical portion and can come into contact with the outer end of the packing member. Fitting member.