JP2008281134A - Pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe joint capable of sufficiently securing at least pipe retaining performance among the fundamental functions required of a pipe joint. <P>SOLUTION: The pipe joint 10 is equipped with a first pipe connection part 12 having a first pipe retaining collet 26 and a first O-ring 22 and a second pipe connection part 14 having second pipe retaining collets 66A and 66B and second O-rings 62A and 62B, wherein the pipe retaining forces of the second pipe retaining collet 66A and 66B, respectively, are made smaller than the pipe retaining force of the first pipe retaining collet 26 so as to secure sufficiently at least the pipe retaining performance among the fundamental characteristics required of a pipe joint even in case an existing pipe OP is connected with the second pipe connection part 14. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a pipe joint mainly used for resin piping for water supply and hot water supply of an apartment house and a detached house, and in particular, a pipe suitably used for connecting an existing pipe and a new pipe at the time of renovation of these houses. It relates to joints.

  In recent years, the renovation market (including renewal and conversion) has grown significantly in the water and hot water supply fields. This is because the life of the building's housing is assumed to be 100 years if the RC structure is used, whereas the life of the piping for water supply and hot water supply is assumed to be around 30 years, so periodic replacement is necessary. It is to become.

Currently, when reforming a water supply or hot water supply pipe, an existing water supply or hot water supply joint (for example, Patent Document 1) is connected to the base of the existing water supply or hot water supply pipe, and the pipe ahead is updated. Often done.
JP-A-10-122469

By the way, all the existing joints described above are designed on the assumption that they will be connected to new pipes, which causes various problems when connected to pipes that have deteriorated over time, such as existing pipes. Sometimes.
As an example, the existing pipe has deteriorated over time, so when trying to hold the existing pipe with a collet as a pipe holding member of a joint for a new pipe, the claws of the collet bite too much and tear (damage) the existing pipe. There is a fear. As another example, existing pipes are easily scratched, and may be damaged before the joint is connected, ensuring sufficient water leakage for the scratch resistance of new pipe joints. Can not do it.
Therefore, in the market, even when existing pipes are connected, it is expected to develop pipe joints that can sufficiently secure at least the pipe retainability of the basic performance (pipe retainability, water leakage) as a joint (pipe joint). Has been.

  An object of the present invention is to provide a pipe joint in which at least the pipe retainability of the basic performance as a joint is sufficiently secured even when an existing pipe is connected in consideration of the above fact.

  In order to achieve the above object, a pipe joint according to claim 1 of the present invention is a pipe joint provided with a plurality of pipe connection parts for connecting pipes, and is provided in the pipe connection part to hold the pipe. The pipe holding force per one pipe holding member is smaller in one of the pipe connecting portions than in the one of the pipe connecting portions.

Next, the operation of the pipe joint according to claim 1 will be described.
For example, when existing pipes that have deteriorated over time are connected to these pipe connection parts because the pipe holding force per pipe holding member of the pipe joint is smaller at one pipe connection part than at the other pipe connection part. In addition, the pipe holding member of the other pipe connecting portion is less likely to tear (damage) the existing pipe than the pipe holding member of the one pipe connecting portion. That is, it can be said that the pipe holding member of the other pipe connection portion has a pipe holding force suitable for the existing pipe compared to the pipe holding member of the one pipe connection portion. Therefore, even when a new pipe is connected to one pipe connection and an existing pipe is connected to the other pipe connection, at least the pipe retention of the basic performance (pipe retention, water leakage) as a joint is sufficient. Can be secured.
The pipe holding property indicates that the pipe holding member holds the pipe with a pipe holding force suitable for the pipe (pipe holding force capable of preventing damage to the pipe).

  A pipe joint according to a second aspect of the present invention is the pipe joint according to the first aspect, wherein the number of the pipe holding members provided in the other pipe connection part is the pipe provided in the one pipe connection part. More than the number of holding members.

Next, the operation of the pipe joint according to claim 2 will be described.
Since the number of pipe holding members provided in the other pipe connection part is larger than the number of pipe holding members provided in the one pipe connection part, the total pipe holding force of the pipe holding member of the other pipe connection part is In this case, when the existing pipe is connected to the other pipe connection portion, a more suitable pipe holding force can be obtained with respect to the existing pipe. At the same time, it is possible to secure a sufficient pipe holding force to hold the existing pipes.

  A pipe joint according to a third aspect of the present invention is the pipe joint according to the first or second aspect, wherein the pipe joint is provided on the deeper side in the insertion direction than the pipe holding member of the pipe connection portion, and the outer peripheral surface of the pipe It is characterized in that the number of water-stopping members that are in close contact with each other and suppress water leakage is larger in one of the pipe connection portions than in the one of the pipe connection portions.

Next, the operation of the pipe joint according to claim 3 will be described.
Since the number of water-stop members that are provided in the pipe connection part and closely adhere to the outer peripheral surface of the pipe to suppress water leakage is smaller in one pipe connection part than the other pipe connection part, the other pipe connection part is It has better water leakage than one pipe connection and can be used with existing pipes.

  A pipe joint according to a fourth aspect of the present invention is characterized in that, in the pipe joint according to the third aspect, the plurality of water-stop members provided in the other pipe connection portion have different compression rates.

Next, the operation of the pipe joint according to claim 4 will be described.
Since the plurality of water-stopping members provided in the other pipe connection part have different compression rates, for example, the compression rate of the water-stopping member on the deepest side in the insertion direction is the other water-stopping member among the plurality of water-stopping members. When the compression rate is smaller than that, the tip end side of the existing pipe is compressed by the water stop member more than the other parts, so that the water leakage is further improved.

  The pipe joint of the present invention has an excellent effect that even when an existing pipe is connected, at least the pipe retainability of the basic performance as a joint can be secured.

[First Embodiment]
(Configuration) Next, a first embodiment of the pipe joint of the present invention will be described with reference to FIG. FIG. 1 is a partial cross-sectional view of a pipe joint, and an arrow X direction in the figure indicates a central axis direction of the pipe joint. In the present embodiment, a new new pipe NP is connected to one pipe connecting portion (first pipe connecting portion 12 described later) of the pipe joint 10 of the present invention, and the other pipe connecting portion (second described later). The pipe connection part 14) is connected to the base of an existing pipe OP for water supply and hot water supply at the time of home renovation. In addition, the existing pipe (hereinafter referred to as the existing pipe OP) referred to here refers to a resin pipe that has been deteriorated to some extent over time, and a new pipe (hereinafter referred to as a new pipe NP) is substantially deteriorated over time. It refers to the resin pipe that is not.

  As shown in FIG. 1, the pipe joint 10 has a substantially cylindrical shape and includes a first pipe connection portion 12 on one end side in the arrow X direction and a second pipe connection portion 14 on the other end side in the arrow X direction. Has been. In addition, the boundary of the 1st pipe connection part 12 of this embodiment and the 2nd pipe connection part 14 is shown with the dashed-two dotted line in FIG.

(First pipe connection)
The first pipe connection portion 12 includes a substantially cylindrical first joint body 20, a first O-ring 22 housed in the first joint body 20, a first collet housing member 24, and a first collet housing member 24. Each of the first pipe holding collet 26 and the like, and a first cap 30 having a first pipe insertion port 28 through which the new pipe NP is inserted and provided on the distal end side of the first joint body 20. .

  The inner peripheral surface of the first joint body 20 has a first large-diameter portion 32 and a first medium-diameter portion 34 having a smaller diameter than the first large-diameter portion 32 from the outer side to the inner side in the arrow X direction. And a first small-diameter portion 36 having a smaller diameter than the first medium-diameter portion 34. Further, a first outer step 38 is formed by the first large diameter portion 32 and the first medium diameter portion 34, and a first inner step is formed by the first medium diameter portion 34 and the first small diameter portion 36. 40 is formed.

  The inner diameter of the first small diameter portion 36 is set to be smaller than the outer diameter of the new pipe NP, and the inner diameter of the first medium diameter portion 34 is set to be larger than the outer diameter of the new pipe NP. Thereby, when the new pipe NP is inserted, the first inner step 40 becomes a stop portion of the new pipe NP.

  A cylindrical first collet housing member 24 is inserted into the first large diameter portion 32 of the first joint body 20. A first outer flange portion 42 protruding outward in the radial direction of the first collet storage member 24 is formed at an end portion on the outer side in the arrow X direction of the first collet storage member 24, and an end portion on the inner side in the arrow X direction A first inner flange portion 44 that protrudes radially inward of the first collet housing member 24 is formed. Since the outer diameter of the first outer flange portion 42 is set to be larger than the inner diameter of the first large-diameter portion 32, the first collet housing member 24 falls off inside the first joint body 20. Is prevented.

  A cylindrical first pipe holding collet 26 is inserted inside the first collet housing member 24. The first pipe holding collet 26 has a first collet inclined surface 46 in which the outer peripheral surface of the end portion on the outer side in the arrow X direction is tapered, and the inner peripheral surface protrudes radially inward. 48. Since the outer diameter of the first pipe holding collet 26 is set larger than the inner diameter of the first inner flange portion 44 of the first collet housing member 24, the first pipe holding collet 26 It is prevented that the inside of the joint body 20 of 1 is dropped. Further, the first claw portion 48 presses the outer surface of the inserted new pipe NP to hold the new pipe NP.

  An annular first O-ring 22 is disposed between the first collet housing member 24 and the first outer step 38. The first O-ring 22 increases the adhesion rate with the new pipe NP by compressing the new pipe NP to be inserted. For example, as a method for increasing the compression rate, the inner diameter of the first O-ring 22 may be smaller than the outer diameter of the new pipe NP.

A first cap 30 is attached to the outer end of the first joint body 20 in the arrow X direction. The method for attaching the first cap 30 is not particularly limited, but in the present embodiment, the first male screw 50 formed on the outer peripheral surface of the outer end of the first joint body 20 in the direction of the arrow X is the first A first female screw 52 formed on the inner peripheral surface of the cap 30 is screwed together. By attaching the first cap 30 to the first joint body 20, the first O-ring 22, the first collet housing member 24 and the first pipe holding collet 26 are prevented from falling off in the direction of the arrow X. Is done.
Further, a first cap inclined surface 54 inclined in a reverse taper shape is formed at a portion of the first cap 30 where the first collet inclined surface 46 of the first pipe holding collet 26 contacts.

(Second pipe connection)
The second pipe connection portion 14 includes a substantially cylindrical second joint body 60, and a second O-ring 62A, a second O-ring 62B, and a second O-ring 62A housed in the first joint body 60. The collet housing member 64, the second pipe holding collet 66A, the second pipe holding collet 66B, and the like, and the second pipe main body 60 having a second pipe insertion port 68 through which the existing pipe OP is inserted. And a second cap 70 provided on the distal end side.

  The inner peripheral surface of the second joint body 60 has a second large-diameter portion 72 and a second medium-diameter portion 74 having a smaller diameter than the second large-diameter portion 72 from the outside in the arrow X direction to the inside. And a second small diameter portion 76 having a smaller diameter than the second medium diameter portion 74. A second outer step 78 is formed by the second large diameter portion 72 and the second medium diameter portion 74, and a second inner step is formed by the second medium diameter portion 74 and the second small diameter portion 76. 80 is formed.

  The inner diameter of the second small diameter portion 76 is set to be smaller than the outer diameter of the existing pipe OP, and the inner diameter of the second medium diameter portion 74 is set to be larger than the outer diameter of the existing pipe OP. Thereby, when the existing pipe OP is inserted, the second inner step 80 becomes a stop portion of the existing pipe OP.

  A cylindrical second collet housing member 64 is inserted into the second large diameter portion 72 of the second joint body 60. A second outer flange portion 82 that protrudes radially outward of the second collet storage member 64 is formed at the end of the second collet storage member 64 on the outer side in the arrow X direction. A second inner flange portion 84 that protrudes radially inward of the second collet housing member 64 is formed. Since the outer diameter of the second outer flange portion 82 is set to be larger than the inner diameter of the second large diameter portion 72, the second collet housing member 64 falls off inside the second joint body 60. Is prevented.

  Further, a cylindrical second pipe holding collet 66A is inserted inside the second collet housing member 64, and a second pipe holding collet 66B is inserted inside the second pipe holding collet 66A in the direction of the arrow X. Has been. A second claw portion in which the outer peripheral surface of the second pipe holding collet 66A on the end side in the arrow X direction has a second collet inclined surface 86A inclined in a taper shape, and the inner peripheral surface protrudes radially inward. 88A. A second claw portion in which the outer peripheral surface on the end side in the arrow X direction of the second pipe holding collet 66B has a second collet inclined surface 86B inclined in a taper shape, and the inner peripheral surface protrudes radially inward. 88B.

  Since the outer diameter of the second pipe holding collet 66B is set larger than the inner diameter of the second inner flange portion 84 of the second collet housing member 64, the second pipe holding collet 66B and the second pipe holding collet 66B The one pipe holding collet 66 </ b> A is prevented from dropping out to the inside of the second joint body 60. Further, the second claw portion 88A and the second claw portion 88B hold the existing pipe OP by pressing the outer surface of the inserted existing pipe OP. In the present embodiment, the second pipe holding collet 66A and the second pipe holding collet 66B have the same configuration.

  An annular second O-ring 62A is disposed between the second collet housing member 64 and the second outer step 78, and the second O-ring is located on the inner side in the arrow X direction than the second O-ring 62A. 62B is arranged. The second O-ring 62 </ b> A and the second O-ring 62 </ b> B increase the adhesion rate with the outer surface of the existing pipe OP by compressing the existing pipe OP to be inserted. For example, as a method of increasing the compression rate, the inner diameters of the second O-ring 62A and the second O-ring 62B may be smaller than the outer diameter of the existing pipe OP. Further, the compression rates of the second O-ring 62A and the second O-ring 62B of the present embodiment are different.

  A second cap 70 is attached to the outer end of the second joint body 60 in the direction of the arrow X. The method for attaching the second cap 70 is not particularly limited, but in the present embodiment, the second male screw 90 formed on the outer peripheral surface of the outer end of the second joint body 60 in the arrow X direction is connected to the second male screw 90. A second female screw 92 formed on the inner peripheral surface of the cap 70 is screwed together. By attaching the second cap 70 to the second joint body 60, the second O-ring 62A, the second O-ring 62B, the second collet housing member 64, the second pipe holding collet 66A, and the second The pipe holding collet 66B is prevented from falling off in the arrow X direction. Further, a second cap inclined surface 94 that is inclined in a reverse taper shape is formed at a portion of the second cap 70 where the second collet inclined surface 86A of the second pipe holding collet 66A contacts.

  The pipe holding force of each of the second pipe holding collet 66A and the second pipe holding collet 66B is set to be smaller than the pipe holding force of the first pipe holding collet 26, and the second pipe connecting portion 14 The total pipe holding force (the sum of the pipe holding forces of the second pipe holding collet 66A and the second pipe holding collet 66B) is the total pipe holding force (first pipe holding collet). 26 pipe holding force) or more.

In the present embodiment, the first joint body 20 and the second joint body 60 are integrally formed, and the first small diameter portion 36 and the second small diameter portion 76 have the same diameter.
Moreover, as a material suitably used for the joint main body of the present embodiment, for example, a metal material such as a gun metal of CAC406 or CAC406C, or water resistance, heat resistance, wear resistance, impact resistance, chlorine resistance, and hygiene surface For example, a synthetic resin material represented by polybutene is desirable.
The collet usually has a composite structure of stainless steel claws represented by SUS304 and a synthetic resin that wraps them, and this synthetic resin material includes heat resistance and chemical resistance represented by PEEK. A material excellent in stress cracking resistance, strength, etc. is selected.
A general metal material and a synthetic resin material can be used for the cap. Typically, gun metal (CAC406C) and 66 nylon are used.
For the O-ring, it is desirable to use a rubber material excellent in water resistance, heat resistance, chemical resistance, chlorine resistance, etc., such as EPDM and NBR.
As a material used for the collet housing member, a synthetic resin material excellent in heat resistance, water resistance, strength, and dimensional stability such as PEEK, polysulfone, modified PPE, polyacetal, and PPS is desirable, but a metal material made of stainless steel is also applicable.

(Operation) Next, the operation and effect of the first embodiment will be described.
When a new pipe NP is inserted and connected to the first pipe connection portion 12 of the pipe joint 10 of the present invention, and the existing pipe OP is inserted and connected to the second pipe connection portion 14, the new pipe NP and the existing pipe NP are connected. These pipes can be held with a suitable pipe holding force without damaging either of the pipes OP. That is, the basic performance (pipe retention, water leakage) as a joint can be sufficiently secured.

  This is because the pipe holding force of each of the second pipe holding collet 66A and the second pipe holding collet 66B is made smaller than the pipe holding force of the first pipe holding collet 26, so that the second pipe connecting portion 12 The pressing force of the second claw portion 88A of the second pipe holding collet 66A and the second claw portion 88B of the second pipe holding collet 66B acting locally on the existing pipe OP inserted into the pipe OP decreases, This is because damage to the existing pipe OP is suppressed.

  Further, since the total pipe holding force of the second pipe connecting portion 12 is set to be equal to or greater than the total pipe holding force of the first pipe connecting portion 14, it acts on the existing pipe OP inserted into the second pipe connecting portion 14. Sufficient holding power for all pipes

  Furthermore, the existing pipe OP is more easily damaged than the new pipe NP, and may be damaged before the pipe joint 10 is connected. For this reason, by providing a plurality of second O-rings in the second pipe connection portion 14, it is possible to suppress water leakage from the second pipe connection portion 14 and foreign matter contamination.

[Other Embodiments]
In the first embodiment, two second pipe holding collets are provided in the second pipe connection portion 14, but the present invention is not limited to this configuration, and three or more second pipe holdings are provided. A collet may be provided.

  Moreover, although the pipe joint 10 of 1st Embodiment was set as the structure which has the 1st pipe connection part 12 and the 2nd pipe connection part 14, this invention does not need to be limited to this structure, A connection part It may be a configuration in which three or more are provided.

Furthermore, in the first embodiment, the existing pipe OP is inserted and connected to the first pipe connection portion 12 of the pipe joint 10, and the existing pipe OP is inserted and connected to the second pipe connection portion 14. However, the present invention is not necessarily limited to this configuration, and pipes other than the existing pipe OP may be connected to the second pipe connection portion 14.
Needless to say, the present invention is not limited to the above-described embodiments, and can be implemented with various modifications within the scope of the claims.

It is a fragmentary sectional view of the pipe joint of a 1st embodiment.

Explanation of symbols

10 Pipe joint 12 1st pipe connection part (one pipe connection part)
14 Second pipe connection (the other pipe connection)
22 First O-ring (water-stop member)
26 First pipe holding collet (pipe holding member)
62A Second O-ring (water stop member)
62B Second O-ring (water-stop member)
66A Second pipe holding collet (pipe holding member)
66B Second pipe holding collet (pipe holding member)

Claims (4)

In a pipe joint provided with a plurality of pipe connections for connecting pipes,
A pipe joint characterized in that a pipe holding force per pipe holding member that is provided in the pipe connecting portion and holds the pipe is smaller in one pipe connecting portion than in the other pipe connecting portion.   2. The pipe joint according to claim 1, wherein the number of the pipe holding members provided in the other pipe connecting portion is larger than the number of the pipe holding members provided in the one pipe connecting portion.   The number of water stop members provided on the deeper side in the insertion direction than the pipe holding member of the pipe connecting portion and closely contacting the outer peripheral surface of the pipe to suppress water leakage is greater than that of the one of the pipe connecting portions. 3. The pipe joint according to claim 1 or 2, wherein the pipe joint is large in number. The pipe joint according to claim 3, wherein the plurality of water stop members provided in the other pipe connection portion have different compression rates.

Images