JP2010175049A - Structure of joint part and member for protecting painted film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure of a joint part capable of preventing a painted film in a lock ring storage groove from being damaged and peeled off. <P>SOLUTION: This structure of the joint part is constituted by painting the inside of a socket 16, forming a tapered face 23 having diameter contracting more when approaching a socket opening end side on an inner face on the socket opening end side of the lock ring storage groove 21, and fitting an annular member 44 for protecting the painted film covering the tapered face 23 into the lock ring storage groove 21. The member 44 for protecting the painted film has a conical face 45 coming into surface contact with the tapered face 23. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a structure of a joint portion configured by inserting an insertion port into a receiving port, and a paint film protecting member used in the joint portion.

  Conventionally, for example, as shown in FIGS. 8 and 9, as a structure of the joint portion 13 of the gate valve 11 and the pipe 12, a receiving port 16 is provided in a pipe portion 15 formed at the inlet / outlet of the valve box 14. In some cases, an insertion port 17 is provided at the tip of 12 and the insertion port 17 is inserted into the receiving port 16 to connect the gate valve 11 and the pipe 12. The joint portion 13 conforms to an NS joint (Japanese Waterworks Association Standard JWWA G113 / 114), which is an example of a seismic joint, and is configured as follows.

  On the inner surface of the receiving port 16, there is a sealing material storing groove 19 for storing the rubber ring 18 for sealing on the opening side, and a lock ring storing groove 21 for storing the lock ring 20 on the inner side of the receiving port 16. Is formed over. The rubber band 18 for sealing seals between the inner peripheral surface of the receiving port 16 and the outer peripheral surface of the insertion port 17, and is stored in the sealing material storage groove 19. The lock ring storage groove 21 stores the centering rubber 22 and stores the lock ring 20.

  As shown in FIGS. 9 and 10, a tapered surface 23 is formed on the inner surface of the lock ring housing groove 21 on the opening side of the receiving opening, the diameter of which is reduced toward the opening of the receiving opening. Further, the lock ring 20 has a tapered surface 24 whose diameter increases toward the receiving opening end side on the inner periphery.

  An insertion port protrusion 26 that protrudes radially outward is formed on the outer surface of the distal end of the insertion port 17 over the entire circumference. The insertion opening 17 is inserted into the back side of the receiving opening 16 beyond the rubber ring 18 for sealing and the lock ring 20. The insertion projection 26 is positioned on the back side of the receiving port 16 with respect to the lock ring 20 and is configured to engage with the lock ring 20 from the back side of the receiving port 16 in the withdrawal direction A.

  Further, a bending prevention ring body storage groove 27 is formed on the opening side of the receiving port 16, and a bending prevention ring body 28 is stored in the storage groove 27. The receiving port 16 is provided with a set bolt 29 that presses the bending preventing ring body 28 against the outer peripheral surface of the insertion port 17.

  According to this, when an earthquake occurs, for example, as shown in FIG. 10, the insertion protrusion 17 is engaged with the lock ring 20 in the removal direction A, thereby preventing the insertion opening 17 from coming out of the receiving opening 16. be able to. At this time, the lock ring 20 changes the inside of the lock ring storage groove 21 to the receiving opening end side and directly contacts the tapered surface 23 of the lock ring storage groove 21.

  In addition, about the structure of the above joint parts 13, it describes in the following patent document 1, for example.

JP 2001-330185 A

  However, in the above conventional type, as shown in FIG. 10, when powder coating is applied to the inside and outside of the valve box 14 (including the inside of the receiving port 16), the lock ring 20 has the lock ring housing groove 21 as described above. There is a problem in that the coating film 30 on the taper surface 23 is damaged or peeled off.

  An object of the present invention is to provide a joint film structure and a paint film protecting member capable of preventing damage and peeling of the paint film in the lock ring storage groove.

In order to achieve the above object, according to the first aspect of the present invention, an insertion opening formed at the end of the other pipe portion is inserted into the receiving opening formed at the end of the one pipe portion, and the inner surface of the receiving opening is formed. The structure of the joint portion configured to engage the insertion protrusion on the outer surface of the insertion port from the back side of the receiving port to the lock ring fitted in the formed lock ring storage groove,
The interior of the receptacle is painted,
A tapered surface is formed on the inner surface of the lock ring housing groove on the opening end side of the receiving ring, the diameter of which is reduced toward the receiving port opening end side.
An annular coating film protecting member that covers the tapered surface is fitted into the lock ring storage groove,
The coating film protecting member has a conical surface in surface contact with the tapered surface.

  According to this, for example, when an earthquake occurs, it is possible to prevent the insertion port from coming out of the receiving port by engaging the insertion port protrusion with the lock ring in the removal direction. At this time, the lock ring changes the inside of the lock ring storage groove to the receiving opening opening end side and comes into contact with the coating film protecting member. As a result, the lock ring can be prevented from coming into contact with the taper surface of the lock ring storage groove, so that the coating film formed on the taper surface of the lock ring storage groove can be prevented from being damaged or peeled off. The coating film on the surface can be protected by the coating film protecting member.

  The structure of the joint portion in the second aspect of the invention is that the coating film protecting member is a C-shaped ring, and a conical surface formed by being elastically deformed into a reduced diameter state when fitted into the lock ring housing groove. It substantially coincides with the tapered surface.

  According to this, a conical surface is formed in the coating film protection member by fitting the coating film protection member into the lock ring storage groove, and the conical surface of the coating film protection member is formed into a tapered surface of the lock ring storage groove. Can be overlaid.

  The structure of the joint portion in the third invention is that the coating film protecting member is constrained by overlapping one end portion and the other end portion in the circumferential direction in the tube axis direction against the elastic biasing force in the diameter expansion direction. It has a restraining means to do.

  According to this, the outer diameter of the coating film protection member is reduced by overlapping and restraining the one end and the other end of the coating film protection member in the tube axis direction, and the coating film protection member is received. It can be inserted into the receiving opening from the opening end of the mouth and fitted into the lock ring housing groove.

The structure of the joint part in the fourth invention is that the outer diameter of the coating film protection member is smaller than the minimum inner diameter part in the receiving port by constraining the coating film protection member by overlapping one end and the other end. And
When the restriction is released, the outer diameter of the coating film protecting member is expanded by the elastic biasing force in the diameter expanding direction.

  According to this, the outer diameter of the coating film protection member is reduced by overlapping and restraining the one end and the other end of the coating film protection member, and the coating film protection member is removed from the opening end of the receiving port. It can be inserted into the receiving port and fitted into the lock ring storage groove. At this time, since the outer diameter of the coating film protecting member is smaller than the minimum inner diameter portion in the receiving port, the coating film protecting member easily passes through the minimum inner diameter portion in the receiving port.

  The fifth aspect of the present invention is a coating film protecting member used in the structure of the joint portion according to any one of the first to fourth aspects of the present invention.

  As described above, according to the present invention, the coating film formed on the tapered surface of the lock ring housing groove can be prevented from being damaged or peeled off, and the coating film on the tapered surface can be protected by the coating film protecting member. .

It is sectional drawing which shows the structure of the coupling part in embodiment of this invention. It is an expanded sectional view of the lock ring accommodation groove part of a joint part same as the above. It is a perspective view of the member for coating-film protection with which a joint part is mounted | worn similarly, (a) is the natural state removed from the joint part, (b) is the mounting state fitted in the lock ring accommodation groove, (c ) Indicates a restraint state. It is a figure in the natural state of the member for coating film protection with which a joint part is mounted | worn similarly, (a) is a front view, (b) is a XX arrow directional view in (a). It is a figure in the restraint state of the coating film protection member with which a joint part is mounted | worn similarly, (a) is a front view, (b) is a XX arrow directional view in (a). It is a figure in the mounting state of the coating film protection member with which a joint part is mounted | worn similarly, (a) is a front view, (b) is a XX arrow directional view in (a). It is a figure which shows the mounting method of the member for coating film protections mounted | worn with a joint part similarly. It is a figure of piping provided with the valve and the insertion port which provided the conventional receiving port. It is sectional drawing which shows the structure of the conventional coupling part. It is an expanded sectional view of the lock ring accommodation groove part of a joint part same as the above.

Embodiments of the present invention will be described below with reference to the drawings. In addition, about the same member as the conventional thing mentioned above, the same code | symbol is attached and description is abbreviate | omitted.
As shown in FIG. 1, as a structure of the joint portion 40 between the gate valve 11 and the pipe 12, the receiving port 16 provided in the pipe portion 15 (an example of one pipe portion) formed at the inlet / outlet of the valve box 14. There is one that connects the gate valve 11 and the pipe 12 by inserting an insertion port 17 provided at the tip of the pipe 12 (an example of the other pipe section).

  The inner and outer surfaces of the valve box 14 are powder coated, and as shown in FIG. 2, a coating film 41 is formed on the inner surface of the receiving port 16 by powder coating. A lock ring 42 is fitted in the lock ring storage groove 21. The lock ring 42 has a tapered surface 43 whose diameter increases toward the opening end of the receiving opening on the inner periphery, and is provided so as to be attached to the outer peripheral surface of the insertion opening 17.

  An annular coating film protecting member 44 that covers the tapered surface 23 is fitted in the lock ring housing groove 21. As shown in FIG. 3 (b), the coating film protecting member 44 is formed by deforming a thin spring steel plate having elasticity into a truncated cone shape, and has a conical surface 45 in surface contact with the tapered surface 23. have.

  FIGS. 3A and 4 show a natural state in which the coating film protection member 44 is removed from the joint portion 40, and the coating film protection member 44 is a C-shaped ring having a cut portion 46 at one place. is there. Each of the one end 44a and the other end 44b of the coating film protecting member 44 is formed with a plurality of restraint holes 47a to 47d (two in FIG. 4). Each of the constraining holes 47a to 47d is an example of constraining means that constrains and constrains the one end 44a and the other end 44b in the tube axis direction against the elastic biasing force in the diameter expansion direction.

  As shown in FIGS. 3C and 5, the one end 44 a and the other end 44 b of the coating film protecting member 44 are overlapped, the restricting hole 47 a and the restricting hole 47 c are overlapped, and the restricting hole 47 b is restricted. The hole 47d is overlapped, and the bifurcated pin 51 is inserted into the overlapping restraining holes 47a and 47c and the overlapping restraining holes 47b and 47d to restrain the one end 44a and the other end 44b, thereby painting. The outer diameter Dmin (see FIG. 5B) of the film protecting member 44 is smaller than the diameter B (see FIG. 7) of the minimum inner diameter portion 49 in the receiving port 16.

  Further, when the pin 51 is removed and the restraint is released, the outer diameter of the coating film protection member 44 is expanded by the elastic biasing force in the diameter increasing direction, and the coating film protection member 44 is shown in FIGS. Restore to the natural state shown in.

  Further, when the coating film protection member 44 is fitted into the lock ring storage groove 21 and the restriction is released, the outer diameter D of the coating film protection member 44 is expanded by the elastic biasing force, and the diameter of the lock ring storage groove 21 is increased. Almost the same as C. In this state, the outer diameter D of the coating film protecting member 44 shown in FIG. 6B is smaller than the outer diameter Dmax in the natural state shown in FIG. 4B, and FIG. It is larger than the outer diameter Dmin in the constrained state shown in b). At this time, as shown in FIG. 3B, the coating film protecting member 44 is maintained in the shape of a truncated cone having a conical surface 45, and the one end portion 44a and the other end portion 44b are close to or in contact with each other in the circumferential direction. The cutting part 46 shrinks or disappears.

Moreover, the recessed part 50 is formed in the several places of the inner peripheral part of the member 44 for coating film protection.
Below, the connection method of the said gate valve 11 and the piping 12 is demonstrated.
First, the diameter of the lock ring 42 is forcibly reduced, and the lock ring 42 is inserted from the opening end of the receiving port 16 into the inside, and is fitted into the lock ring storage groove 21. Thereafter, as shown in FIG. 3 (c), one end 44a and the other end 44b of the coating film protecting member 44 are overlapped, and pinned to the overlapping restraining holes 47a and 47c and the overlapping restraining holes 47b and 47d. 51, the one end 44a and the other end 44b are constrained. As shown in FIG. 7, the coating film protecting member 44 is moved from the opening end of the receiving port 16 to the inner lock ring housing groove 21 as shown in FIG. Insert to the position of. At this time, since the outer diameter Dmin of the coating film protection member 44 is smaller than the diameter B of the minimum inner diameter portion 49 in the receiving port 16, the coating film protection member 44 easily passes through the minimum inner diameter portion 49.

  Thereafter, by removing each pin 51 from the restraining holes 47a to 47d, as shown in FIG. 3B, the outer diameter of the coating film protecting member 44 is expanded by the elastic biasing force, and the phantom line in FIG. As shown, the coating film protecting member 44 is fitted into the lock ring housing groove 21 to cover the tapered surface 23.

  At this time, as shown in FIG. 2A, the outer peripheral edge of the coating film protecting member 44 abuts against the bottom of the lock ring housing groove 21, and the outer diameter D of the coating film protecting member 44 is set to the lock ring housing groove. As shown in FIG. 3B, the coating film protecting member 44 is maintained in a truncated cone shape having a conical surface 45, and the conical surface 45 substantially coincides with the tapered surface 23. And overlaps the tapered surface 23. Thereby, the coating film protection member 44 can be mounted in the lock ring storage groove 21 in a factory or the like.

The coating film protecting member 44 can be bent uniformly by forming the recess 50 in the coating film protecting member 44.
Thereafter, the sealing rubber ring 18 is inserted into the inside from the opening end of the receiving port 16 and is fitted into the sealing material accommodation groove 19. Further, the bending preventing ring body 28 is housed in the bending preventing ring body housing groove 27 of the receiving port 16.

  Thereafter, in the piping laying construction site or the like, the insertion port 17 of the piping 12 is inserted into the receiving port 16 of the gate valve 11 as shown in FIG. As a result, the insertion protrusions 26 of the insertion opening 17 are formed on the inner circumference of the bending preventing ring body 28, the inner circumference of the sealing rubber ring 18, the inner circumference of the coating film protecting member 44, and the inner circumference of the lock ring 42. And is located between the lock ring 42 and the back end surface 16a of the receiving port 16. When the insertion projection 26 passes through the inner periphery of the lock ring 42, the lock ring 42 is enlarged in diameter, and after passing, the lock ring 42 is reduced in diameter and is held by the outer peripheral surface of the insertion port 17. Thereby, the gate valve 11 and the piping 12 are connected.

  As shown in FIG. 4 (a), the width of the coating film protection member 44 is W, and as shown in FIGS. 2 (a) and 6 (b), the inner diameter of the coating film protection member 44 in the mounted state. Is d1, and the inner diameter d1 of the tapered surface 23 in the receiving port 16 is d2, the inner diameter d1 of the coating film protection member 44 is tapered when the coating film protection member 44 is fitted into the lock ring housing groove 21. By setting the width W of the coating film protection member 44 so as to be larger than the inner diameter d2 of the portion of the surface 23, the coating film protection member 44 is accommodated in the lock ring housing groove 21. For this reason, there is no possibility that the coating film protecting member 44 becomes an obstacle when the insertion port 17 is inserted into the receiving port 16.

  Further, for example, when an earthquake occurs, as shown in FIG. 2 (b), the insertion opening 17 is prevented from coming out of the receiving opening 16 by engaging the insertion protrusion 26 with the lock ring 42 in the removal direction A. can do. At this time, the lock ring 42 changes the inside of the lock ring storage groove 21 toward the opening of the receiving opening and comes into contact with the coating film protecting member 44. As a result, it is possible to prevent the lock ring 42 from coming into contact with the tapered surface 23, so that the coating film 41 formed on the tapered surface 23 can be prevented from being damaged or peeled off, and the coating film 41 on the tapered surface 23 can be prevented. Can be protected by the coating film protecting member 44.

  In the above embodiment, the receiving port 16 is provided in each of the pipe parts 15 formed at the inlet / outlet of the valve box 14, but the receiving port 16 is provided in one of the pipe parts 15 of the inlet / outlet, and the other side of the opposite side An insertion opening 17 may be provided in one pipe portion 15.

  In the said embodiment, although the structure of the joint part 40 of the gate valve 11 and the piping 12 was shown, a receiving port is provided in the edge part of one piping (an example of one pipe part), and the other piping (other side) It may be a joint portion between pipes provided with an insertion port at an end of the pipe portion (an example of the tube portion) and connected by inserting the insertion port into the receiving port. Moreover, although the joint of the said embodiment is provided in the valve box, it is applicable also to the joint provided in piping members, such as a pipe, a branch pipe, and a pump.

  In the said embodiment, although NS type | mold joint (Japan Water Works Association standard JWWA G113 * 114) which is an example of an earthquake-resistant joint was mentioned as the joint part 40, joints other than this type may be sufficient.

  In the above embodiment, as shown in FIG. 4, two restraint holes 47a to 47d are formed in each of the one end 44a and the other end 44b of the coating film protecting member 44. Alternatively, a plurality of three or more may be formed. When one restriction hole is formed in each of the one end 44a and the other end 44b of the coating film protection member 44, the one end 44a and the other end 44b of the coating film protection member 44 are overlapped. When restrained by a single pin, there is a risk that the one end 44a may protrude from the other end 44b (or the other end 44b from the one end 44a). When a plurality of one end 44a and the other end 44b are formed, no protrusion occurs.

  In the above embodiment, the concave portion 50 is formed in the coating film protecting member 44, but the coating film protecting member 44 in which the concave portion 50 is not formed may be used.

12 Piping (the other pipe)
15 Pipe part (one pipe part)
16 receiving port 17 insertion port 21 lock ring storage groove 23 taper surface 26 insertion projection 40 joint portion 42 lock ring 44 coating film protecting member 44a one end 44b other end 45 conical surfaces 47a to 47d constraining holes (constraining means)
49 Minimum inner diameter

Claims (5)

A lock ring inserted into a lock ring storage groove formed on the inner surface of the receiving port by inserting an insertion port formed at the end of the other tube portion into the receiving port formed at the end of one tube portion The structure of the joint portion configured to engage the insertion projection on the outer surface of the insertion port from the back of the receiving port,
The interior of the receptacle is painted,
A tapered surface is formed on the inner surface of the lock ring housing groove on the opening end side of the receiving ring, the diameter of which is reduced toward the receiving port opening end side.
An annular coating film protecting member that covers the tapered surface is fitted into the lock ring storage groove,
The paint film protecting member has a conical surface in surface contact with the tapered surface. The paint film protecting member is a C-shaped ring, and when fitted into the lock ring storage groove, a conical surface formed by elastic deformation in a reduced diameter state substantially coincides with a tapered surface. The structure of the joint part according to claim 1. The coating film protecting member has a restraining means that restrains the one end and the other end in the circumferential direction to overlap and restrain in the tube axis direction against an elastic biasing force in the diameter expansion direction. Item 2. The joint structure according to Item 2. By overlapping and constraining one end and the other end of the coating film protecting member, the outer diameter of the coating film protecting member is reduced from the minimum inner diameter portion in the receiving port,
4. The joint structure according to claim 3, wherein when the constraint is released, the outer diameter of the coating film protecting member is expanded by an elastic biasing force in the diameter increasing direction. The coating film protecting member, which is used for the structure of the joint portion according to any one of claims 1 to 4.

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