JP6043580B2 - Pipe fitting - Google Patents

Description

  The present invention relates to a pipe joint for connecting pipe bodies.

  In this technical field, a pipe joint is known in which a water-stopping member such as an O-ring is installed in a groove formed on the outer peripheral surface of the core of the pipe joint, and the water is stopped by contacting the inner surface of the pipe body. Yes. (See Patent Document 1)

JP 2004-100808 A

However, in the conventional pipe joint as described above, when connecting the pipe body and the joint, when the insertion amount of the pipe body is insufficient, and the water stop member and the inner surface of the pipe body are not in contact, By passing water, the pressure in the groove portion of the water stop member increases, and a part of the water stop member may fall out of the groove portion, leading to water leakage. Furthermore, if a part of the water-stopping member falls off from the groove portion, an operator who notices insufficient insertion of the tubular body cannot appropriately perform the replacement of the tubular body.
In consideration of the above facts, the present invention prevents pressure rise in the groove portion of the water stop member even when the insertion amount of the pipe body relative to the pipe joint is insufficient, so that the water stop member is dropped from the groove, and further the pipe It is an object of the present invention to provide a pipe joint that allows a body to be inserted and removed.

In order to solve the above problems, the present invention proposes the following means.
The pipe joint according to the first aspect of the present invention is installed in a joint main body portion having a pipe body insertion space for inserting a pipe body, and a circumferential groove formed in the joint main body section, and the inner peripheral surface of the pipe body A water-stopping member that contacts and stops water, and a communication portion that is formed on a wall surface on the back side in the tubular body insertion direction in the circumferential groove and communicates the circumferential groove and the tubular body insertion space. Features.

  According to the above configuration, when the pipe body is insufficiently inserted into the pipe joint, water flows into the circumferential groove when water flows, but the circumferential groove passes through the communication portion that communicates the circumferential groove and the pipe body insertion space. Inside water flows out to the tube insertion space side. Therefore, the pressure rise in the circumferential groove can be prevented, and the water stop member can be prevented from dropping from the circumferential groove. Moreover, it becomes possible to insert the pipe body into the pipe joint.

  In the pipe joint according to the second aspect of the present invention, the communication part is a notch formed by notching a part of the circumferential surface of the wall surface on the back side in the tube insertion direction in the circumferential groove. It is characterized by.

  According to the said structure, since a communication part is formed by notching a part of the circumferential direction of the wall surface of the said circumferential groove in the said tube body insertion direction back side, it can manufacture easily.

  The pipe joint according to a third aspect of the present invention is characterized in that the notch is formed by being cut out to the same depth as the circumferential groove in a direction orthogonal to the tube insertion direction.

  According to the above configuration, the notch portion is formed by being cut out to the same depth as the circumferential groove. Therefore, when a part of the water stop member is lifted from the circumferential groove due to insufficient insertion of the tubular body, the tubular body insertion space It is possible to cause the water to flow into the water more remarkably, and more reliably prevent the water stop member from falling off.

  The pipe joint according to the fourth aspect of the present invention is characterized in that the communication portion is formed at a plurality of locations in the circumferential direction.

  According to the above configuration, since the communication portion is formed at a plurality of locations in the circumferential direction, there is insufficient insertion of the tube even when the contact between the tube and the water stop member is uneven in the circumferential direction. In this case, it is possible to more reliably flow out water to the tube body insertion space, and it is possible to more reliably prevent the water stop member from falling off.

  The pipe joint according to a fifth aspect of the present invention is characterized in that the communication portion is formed on a shaft object of the joint with respect to a circumferential position.

When the cutting accuracy is low, the distal end portion of the cut tubular body may be formed inclined with respect to the longitudinal direction of the tubular body. In this case, the tubular body and the water stop member are in contact with each other in a circumferential direction, but there is a possibility that they are not in contact with each other and the portion to be axially supported.
According to the configuration of the pipe joint according to the fifth aspect of the present invention, since the communicating portion is formed on the axis of the joint with respect to the circumferential position, the cutting accuracy of the pipe body described above is low and any point in the circumferential direction Even when there is insufficient insertion, it is possible to arrange the communication portion in the vicinity of the portion where the tube body and the water stop member are not in contact with each other. Therefore, it becomes easy for water to flow out from the circumferential groove to the tube body insertion space, and it is possible to prevent the water-stopping member from falling off more reliably.

  In the pipe joint according to the sixth aspect of the present invention, the joint main body has another peripheral groove adjacent to the peripheral groove via a partition wall on the back side in the tube insertion direction, and the communication part is It is formed in the partition wall.

  According to the said structure, since it has a water stop member in each adjacent circumferential groove, the function loss of the coupling by the drop-off of a water stop member can be prevented more reliably.

  According to the present invention, even when the insertion amount of the pipe body with respect to the pipe joint is insufficient, the pressure increase in the groove portion of the water stop member is prevented, the drop of the water stop member from the groove, and the pipe body by the operator. Can be done appropriately.

It is sectional drawing which shows the state by which the pipe was inserted in the pipe joint which concerns on 1st embodiment of this invention. It is AA sectional drawing of FIG. It is the perspective view which expanded the surrounding groove part periphery of the pipe joint which concerns on 1st embodiment of this invention. It is explanatory drawing explaining the effect | action of the pipe joint which concerns on 1st embodiment of this invention. It is sectional drawing which shows the state by which the pipe was inserted in the pipe joint which concerns on 2nd embodiment of this invention. It is BB sectional drawing of FIG. It is explanatory drawing explaining the effect | action of the pipe joint which concerns on 2nd embodiment of this invention. It is explanatory drawing which shows the other form of this invention.

  Hereinafter, a pipe joint according to an embodiment of the present invention will be specifically described with reference to the accompanying drawings. In FIGS. 2, 3 and 6, the O-ring is not shown for simplicity.

  First, a first embodiment of the present invention will be described. As shown in FIG. 1, the pipe joint 10 includes a joint body portion 30 and a joint peripheral portion 40. The joint body 30 includes a core part 31 formed in a cylindrical shape and a connection part 32 formed continuously at one end of the core part 31. A threaded portion is formed on the outer peripheral surface of the connecting portion 32, and can be connected by screwing with another tube body. A flow path R is formed on the inner peripheral side of the core material 31 and the connection portion 32. The joint peripheral portion 40 includes a holding member 41 formed in a cylindrical shape, a claw member 42 formed in a ring shape, a release ring 43, and a cap 44. A holding member 41 is formed on the outer peripheral side of the core member 31, and a claw member 42 and a release ring 43 are arranged in parallel at one end of the holding member 41. The cap 44 is installed so as to cover the holding member 41, the claw member 42, and the release ring 43 from the outer peripheral side, and prevents the holding member 41 and the like from coming off from the joint main body. In addition, a tubular body insertion space 21 into which the tubular body 20 is inserted is formed between the core member 31 and the holding member 41. The inserted tube 20 is prevented from being pulled out by the claw member 42 arranged at one end of the holding member 41 biting into the outer periphery. Further, the release ring 43 provided along with the claw member 42 is pushed into the claw member 42 side, and the diameter of the claw member 42 is increased to release the bite, whereby the tubular body 20 can be pulled out. Further, the end portion on the side of the connecting portion 32 in the core portion 31 has a flange portion 33 having an enlarged diameter, and the tube body 20 can be inserted until reaching the flange portion 33.

  The core member 31 has circumferential grooves 34A and 34B formed over the entire circumference in the outer circumferential surface thereof. A wall portion 35 is formed between the circumferential groove 34A and the circumferential groove 34B. O-rings 36A and 36B, which are water-stopping members, are fitted in the circumferential grooves 34A and 34B, respectively, and the outer peripheral surfaces of the O-rings 36A and 36B come into contact with the inner peripheral surface of the tubular body 20 to stop water. It has a structure. Hereinafter, the direction along the axis L of the core part 31 is referred to as an axial direction, and the direction orthogonal to the axis L is referred to as a radial direction. Moreover, about the said axial direction, the connection part side is called the back | inner side, and the tubular body 20 side is called this side.

  Here, as shown in FIGS. 1 to 3, the wall portion 35 has a notch portion 37 </ b> A that is notched in the radial direction at a part in the circumferential direction. The cutout portion 37A is formed from the outer peripheral end of the wall portion 35 to the same depth as the groove bottom 34C of the peripheral groove 34A. Furthermore, the wall part 35 has a notch part 37B at a position that is axially symmetric with respect to the notch part 37A and the axis L. The notch 37B is also formed to the same depth as the groove bottom 34C. The circumferential groove 34A and the tubular body insertion space 21 are communicated with each other by notches 37A and 37B formed in the wall 35. Further, the circumferential groove 34A and the circumferential groove 34B are communicated with each other by the notches 37A and 37B.

  In this embodiment, the core part 31 and the connection part 32 are made of gunmetal, are integrally formed by cutting, and the claw member 42 is made of stainless steel. The pipe body 20, the holding member 41, the release ring 43, and the cap 44 are made of resin. Examples of the resin include PPS (polyphenylene sulfide), PB (polybutene), PPSU (polyphenylsulfone), and PES (polyethersulfur). A thermoplastic resin that satisfies thermal performance, water resistance, and leaching performance, such as von), POM (polyacetal), and PEX (crosslinked polyethylene) can be suitably used.

  In addition, each member which comprises the pipe joint 10 is not limited to these materials, Other materials may be sufficient. For example, the core part 31, the connection part 32, and the claw member 42 can be made of resin. Also, the tube body 20 may be made of rubber or other relatively soft member into which the claw member 42 can bite.

  Next, referring to FIGS. 4A, 4B, and 4C, the operation of the pipe joint 10 will be described.

  4 (A), 4 (B) and 4 (C) are state explanatory views showing an example in which the insertion amount of the tube body 20 is insufficient. Here, the tube body 20 has an O-ring 36A in its axial direction. It is inserted to the position that covers about half of the front side.

  FIG. 4A shows a state in which water, which is a fluid, has started to be supplied to the flow path R in the above state, that is, a state in which water pressure has started to be applied to the tube body 20. In this state, the O-ring 36A is pressed in the axially back side by the water pressure from the flow path R side, and the insertion amount of the tubular body 20 is insufficient. Move outward in the direction.

  FIG. 4B shows a state in which a part of the O-ring 36A has moved to the axially inner side and the radially outer side in the circumferential groove 34A due to the phenomenon shown in FIG. In this state, a space is formed between the O-ring 36A and the bottom 34C of the circumferential groove 34A, and the fluid reaches the notches 37A and 37B via the space, and further in the circumferential groove 34B. It flows out into the tubular body insertion space 21. Thereby, the pressure rise in the circumferential groove 34A is suppressed, and the falling off of the O-ring 36A from the circumferential groove 34A can be prevented. The fluid that has flowed out into the tube insertion space 21 flows out of the pipe joint 10 via the outer peripheral side of the pipe body 20, that is, in a water leakage state. You can recognize that there is a problem with the connection.

  FIG. 4C shows a state following the state shown in FIG. As described above, since the pressure in the circumferential groove 34A is reduced, the pressing force in the direction of coming out of the circumferential groove 34A to the O-ring 36A is also reduced, so that the O-ring 36A is again accommodated in the circumferential groove 34A. It will be. Thereby, for example, when an operator notices that the insertion amount of the tubular body 20 is insufficient, the tubular body 20 can be appropriately replaced.

  In the present embodiment, the notch 37B is formed at a position that is axially symmetric with respect to the notch 37A in the circumferential direction. Here, for example, when cutting the pipe body during the manufacturing process or construction of the pipe body, if the cutting accuracy is poor and the tip of the pipe body is cut obliquely, the circumferential groove in the circumferential part of the pipe body However, the circumferential groove may not be covered with the tube at the axially symmetric position. Even in such a state, in the configuration of the present embodiment, since the notch exists at the axially symmetric position, the notch can be disposed near the position where the circumferential groove is not covered with the tubular body. it can. Therefore, when the insertion amount of the tubular body 20 is insufficient at any position in the circumferential direction, the above-described effect can be achieved even when the insertion amount of the tubular body is different in the circumferential direction.

  Further, in the present embodiment, the two circumferential grooves 34 </ b> A and 34 </ b> B are provided. However, the circumferential groove may be only one of 34 </ b> A, and the circumferential groove 34 </ b> B positioned on the back side of the wall portion 35 may not be formed. I do not care.

  Next, a second embodiment of the present invention will be described. In addition, description is abbreviate | omitted about the part which is common in 1st embodiment of this invention. As shown in FIGS. 5 and 6, in the pipe joint 50 according to the present embodiment, the core member 71 has a circumferential groove 74 </ b> A formed over the entire circumference in the outer circumferential surface thereof, Further, another circumferential groove 74 </ b> B is formed over the entire circumference of the core portion 71 via the wall portion 75 on the inner side in the tubular body direction of the circumferential groove 74 </ b> A. O-rings 76A and 76B, which are water-stopping members, are fitted in the circumferential grooves 74A and 74B, respectively, and the outer peripheral surfaces of the O-rings 76A and 76B come into contact with the inner peripheral surface of the tubular body 60 to stop water. It has a structure.

  Here, the wall 75 has a communication hole 77A for communicating the circumferential grooves 74A and 74B, and the communication port 77 is near 74C and 74D (see FIG. 7) which are the groove bottoms of the circumferential grooves 74A and 74B. Has been drilled. Furthermore, the wall 75 has a communication hole 77B at a position that is axially symmetric with respect to the communication hole 77A and the axis L. The communication hole 77B is also formed in the vicinity of the groove bottoms 74C and 74D.

    Next, the action of the pipe joint 50 will be described with reference to FIGS.

  FIGS. 7A, 7B, and 7C are explanatory views showing an example in which the insertion amount of the tube body 60 is insufficient. Here, the tube body 60 has an O-ring 76A in its axial direction. It is inserted to the position that covers about half of the front side.

  FIG. 7A shows a state in which water as a fluid has started to be supplied to the flow path R in the above state, that is, a state in which water pressure has started to be applied to the tube body. In this state, the O-ring 76 </ b> A that is a water stop member is pressed to the axially back side by the water pressure from the flow path R side, and the insertion amount of the tube body 60 is insufficient, so the axially back side And move radially outward.

  FIG. 7B shows a state in which a part of the O-ring 76A has moved from the state of the circumferential groove 74A to the axially inner side and the radially outer side due to the phenomenon shown in FIG. 7A. In this state, a space is formed between the O-ring 76 </ b> A and the bottom 74 </ b> C of the circumferential groove 74 </ b> A, and the fluid reaches the communication hole 77 through the space and is inserted through the communication hole 77. It flows out into the space 61. Thereby, the pressure rise in the circumferential groove 74A is suppressed, and the falling off of the O-ring 76A from the circumferential groove 74A can be prevented. The fluid that has flowed out into the tube body insertion space 61 flows out of the pipe joint 50 via the outer peripheral side of the pipe body 60, that is, enters a water leakage state. You can recognize that there is a problem with the connection.

  FIG. 7C shows a state following the state shown in FIG. As described above, since the pressure in the circumferential groove 74A is lowered, the pressing force in the direction of coming out of the circumferential groove 74A to the O-ring 76A is also lowered, so that the O-ring 76A is again stored in the circumferential groove 74A. It will be. Thereby, for example, when the operator notices that the insertion amount of the tube body 60 is insufficient, the tube body 60 can be appropriately replaced.

  As described above, the first and second embodiments according to the present invention have been described. However, the components in the embodiment can be appropriately replaced with other components without departing from the gist of the present invention. The embodiments described above may be combined as appropriate.

  For example, in the first embodiment, the notches 37A and 37B are configured to be formed to the same depth as the groove bottom 34C. However, even if the notches 37A and 37B are formed to a depth to the intermediate portion in the radial direction of the circumferential groove. Good. The notches 37A and 37B are formed at two places in the circumferential direction, but may be formed at one place in the circumferential direction, or may be formed at four places every 90 ° in the circumferential direction. It may be a configuration. Further, for example, in the second embodiment, the communication holes 77A and 77B communicate with the circumferential grooves 74A and 74B. However, the present invention is not limited to this. For example, as shown in FIG. 8, the circumferential groove 74A and the tube insertion space 61 are provided. It is good also as a structure which communicates directly.

  10, 50: Pipe joint 20, 60: Pipe body 21, 61: Pipe body insertion space 30, 70: Joint body part 31, 71: Core material part 32, 72: Connection part 33, 73: Flange part 34A, 74A, 74B: Circumferential groove 34C, 74C, 74D: Groove bottom 35, 75: Wall part 36A, 76A, 76B: O-ring (water blocking member) 37A, 37B: Notch part (communication part) 77A, 77B: Communication hole (communication) Part) L: Axis R: Flow path

Claims (6)

A joint body provided with a tube insertion space for inserting a tube on the outer peripheral side;
A water-stop member installed in a circumferential groove formed in the joint main body, and abutted against the inner peripheral surface of the tubular body to stop water;
A pipe joint having a communication portion formed on a wall surface of the circumferential groove on the back side in the tube insertion direction and communicating the circumferential groove and the tube insertion space. The communication part is a notch formed by notching a part of the circumferential direction of the wall surface on the back side in the tube insertion direction.
The pipe joint according to claim 1. The notch is formed by being cut out to the same depth as the circumferential groove in a direction perpendicular to the tube insertion direction.
The pipe joint according to claim 2. The communication portion is formed at a plurality of locations in the circumferential direction.
The pipe joint according to any one of claims 1 to 3. The communication portion is formed on a shaft object of the joint with respect to a circumferential position.
The pipe joint according to claim 4. The joint body has another circumferential groove adjacent to the circumferential groove via a partition wall on the inner side in the tube insertion direction,
The communication portion is formed on the partition wall.
The pipe joint according to any one of claims 1 to 5.

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