JP5611438B1 - Structure - Google Patents

Abstract

An object of the present invention is to facilitate screwing of a threaded copper pipe in which a parallel male screw is formed at an end of the copper pipe. A parallel male screw 12 is formed by rolling on an end of a copper tube 11, and a tip 12a of the parallel male screw 12 is tapered. [Selection] Figure 1

Description

The present invention relates to a structure in which a threaded copper tube in which a parallel male screw is formed at an end of a copper tube is screwed to an attached body.

  Conventionally, a technique for forming a male screw at the end of a steel pipe or a SUS pipe by rolling is known. For example, Patent Document 1 discloses rolling a parallel male screw or a tapered male screw at the end of a SUS pipe. It is described that it is formed by processing. By forming the screw by rolling, it is expected that the screw portion is subjected to plastic deformation and the strength of the screw portion is improved.

  Further, as described above, there are parallel screws and taper screws as the types of screws, and each is used properly according to the application. Of these, parallel screws are generally used. However, in parallel screws, the outer diameter of the male screw and the inner diameter of the female screw are almost the same. There was a risk that it would interfere with smooth screwing. That is, it can be said that the taper screw is more desirable from the viewpoint of enabling smooth screwing.

Japanese Patent No. 348845

  However, a taper screw may generate a large stress concentration during tightening. In particular, if a taper screw is used for a relatively soft material such as copper, it may be deformed due to the effect of stress concentration during tightening. was there. In view of this, there has been a demand for a technique for facilitating screwing in a copper pipe that employs a parallel screw that hardly causes stress concentration.

  The present invention has been made in view of the above circumstances, and an object thereof is to facilitate screwing of a threaded copper tube in which a parallel male screw is formed at an end portion of the copper tube.

The threaded copper tube used in the structure according to the present invention is characterized in that a parallel male screw is formed by rolling on the end of the copper tube, and the tip of the parallel male screw is tapered. To do.

In the threaded copper tube used in the structure according to the present invention, the male thread is formed by rolling, so that the threaded portion is subjected to plastic deformation by the rolling process, and the strength can be improved. Further, since the male screw is a parallel screw, it is possible to avoid the occurrence of a large stress concentration at the time of tightening as compared with the taper screw. Furthermore, in the threaded copper tube used in the present invention , since the tip of the parallel male screw is tapered, the end of the parallel male screw is prevented from coming into contact with the end of the female screw during screwing. It is possible to facilitate screwing of the threaded copper tube.

Further, a female screw capable of screwing a threaded copper tube, in which a parallel male screw is formed at the end portion of the copper tube by rolling, and a tip end portion of the parallel male screw is tapered. there a screwed allowed structures formed on the mounting member, with the tubular space which is open to the outside through the opening communicates with the interior space of the female screw is formed in the body to be attached An annular convex portion included in the cylindrical space is provided around the copper tube, and between the outer peripheral surface of the copper tube and the inner peripheral surface of the cylindrical space, and from the annular convex portion. Also, a sealing member may be provided on the tip side of the copper tube.

  Thus, by providing a seal member between the outer peripheral surface of the copper tube and the inner peripheral surface of the cylindrical space containing the copper tube, when the fluid flows in from the tip side of the copper tube, the fluid It is possible to prevent leakage from the gap between the outer peripheral surface of the copper tube and the inner peripheral surface of the cylindrical space. In addition, since the seal member is provided on the tip side of the annular convex portion of the copper tube contained in the cylindrical space, the seal member is removed from the cylindrical space by the pressure of the fluid flowing in from the tip side of the copper tube. Even if it tries to move in the direction of coming out, the movement can be prevented by the annular convex portion. Therefore, the sealing effect by the sealing member can be made more reliable.

It is a side view which shows an example of embodiment of the water supply pipe | tube as a threaded copper pipe used for this invention. It is sectional drawing of the structure before and behind screwing the water supply pipe of FIG. 1 with a to-be-attached member.

Hereinafter, an embodiment of a water supply pipe as a threaded copper pipe used in the present invention and a structure in which the water supply pipe is screwed to an attached member will be described with reference to the drawings. FIG. 1 is a side view showing an example of an embodiment of a water supply pipe as a threaded copper pipe used in the present invention, and FIG. 2 is a cross-sectional view of the structure before and after screwing the water supply pipe of FIG. FIG.

  In this embodiment, the case where the structure 100 shown in FIG. 2 is applied to a faucet structure is described. The water supply pipe 10 connected to the water supply hose corresponds to the threaded copper pipe of the present invention, and the faucet body. The mounted member 20 that constitutes a part of this corresponds to the mounted body of the present invention. The water supplied from the water supply hose is sent to the faucet via the water supply pipe 10 and the attached member 20. However, the target to which the structure 100 is applied is not limited to the faucet structure.

  As shown in FIG. 1, the water supply pipe 10 has a configuration in which a male screw 12 is formed at the end of the copper pipe 11 on the tip side (right side in FIG. 1). The male screw 12 is formed by rolling, and has a relatively high strength by undergoing plastic deformation. Further, the male screw 12 is a parallel screw, and it is possible to avoid the occurrence of a large stress concentration at the time of tightening as compared with the taper screw.

  The distal end portion 12a of the parallel male screw 12 has an outer diameter smaller than the outer diameter D1 of the copper tube 11, and has a tapered shape that gradually decreases toward the distal end side. Such a tapered tip portion 12a is formed by rolling a moderately thick copper tube 11.

  That is, the formation of the parallel male screw 12 by rolling is performed by pressing the copper tube 11 radially inward with a tool such as a roller. At this time, the distal end portion 12a close to the free end is directed in the radial direction. In addition to deformation, deformation to the free end side (front end side) is also possible. Since deformation toward the free end side is possible, deformation in the radial direction is likely to occur, and as a result, the outer diameter of the distal end portion 12a is smaller than the outer diameter D1 of the copper tube 11. At this time, since the degree of freedom of deformation increases as it approaches the free end, the distal end portion 12a has a tapered shape that gradually decreases toward the distal end side.

  As described above, the parallel male screw 12 having the tapered tip portion 12a is formed by rolling using the fact that copper is a relatively soft and easily deformable material. If it is too large, it will become difficult to deform | transform and there exists a possibility that the taper-shaped front-end | tip part 12a cannot be formed well. On the other hand, if the thickness of the copper tube 11 is too small, not only the tapered tip portion 12a but also the parallel male screw 12 itself may not be formed well from the viewpoint of strength. Therefore, in order to form the tapered tip portion 12a by rolling, it is preferable that the thickness of the copper tube 11 is about 0.6 to 1.0 mm, particularly about 0.7 to 0.8 mm.

  Around the copper tube 11, a spool (annular convex portion) 13 having an outer diameter D2 larger than the outer diameter D1 of the copper tube 11 is formed. The spool 13 can be formed by, for example, bulging the copper tube 11, but it is of course possible to form the spool 13 by other methods. The spool 13 is spaced a predetermined distance from the parallel male screw 12 so that an O-ring 30 (see FIG. 2) described later can be attached to the outer peripheral surface of the copper tube 11 between the parallel male screw 12 and the spool 13. Is provided.

  Next, the structure 100 in which the water supply pipe 10 is screwed to the attached member 20 will be described with reference to FIG. 2A shows a state before the water supply pipe 10 is screwed with the attached member 20, and FIG. 2B shows the structure 100 with the water supply pipe 10 screwed with the attached member 20. ing.

  The metal mounted member 20 is formed with a female screw 21 that can be screwed into the parallel male screw 12 of the water supply pipe 10 and a cylindrical space 23 that communicates with the internal space 22 of the female screw 21. Yes. A through hole 26 communicating with the internal space 22 is formed on the opposite side of the cylindrical space 23 with the internal space 22 interposed therebetween. Water is supplied to the faucet through the through hole 26.

  The cylindrical space 23 is opened to the outside through the opening 24 and has an inner diameter D3 that is larger than the outer diameter D1 of the copper tube 11 and slightly smaller than the outer diameter D2 of the spool 13. Further, the edge of the opening 24 of the cylindrical space 23 is chamfered, and a chamfered portion 25 whose inner diameter increases from the back side toward the outside is formed. Here, when the outermost inner diameter of the chamfered portion 25 is D4, the outer diameter D2 of the spool 13 is set so as to satisfy the relationship D3 <D2 <D4.

  When the water supply pipe 10 is screwed into the attached member 20, an O-ring (seal member) 30 is attached to the outer peripheral surface of the copper pipe 11 on the side of the parallel male screw 12 with respect to the spool 13, and then the water supply pipe 10 is attached. The parallel male screw 12 may be inserted into the female screw 21 by being inserted into the cylindrical space 23. At this time, since the outer diameter D2 of the spool 13 satisfies the relationship of D3 <D2 <D4, as the screwing progresses, the spool 13 comes into contact with the chamfered portion 25 and the water supply pipe 10 cannot be screwed any further. . In addition, by forming the chamfered portion 25, it is possible to prevent the parallel male screw 12 and the O-ring 30 from being damaged at the corner of the edge of the opening 24 when the water supply pipe 10 is inserted into the cylindrical space 23.

  Then, as shown in FIG. 2 b, the structure 100 in which the water supply pipe 10 is screwed to the attached member 20 in a state where a part of the copper pipe 11 and the spool 13 are included in the cylindrical space 23. Composed. At this time, the O-ring 30 is located between the outer peripheral surface of the copper tube 11 and the inner peripheral surface of the cylindrical space 23 and between the spool 13 and the parallel male screw 12.

  As described above, when the parallel male screw 12 of the water supply pipe 10 is screwed to the female screw 21 of the attached member 20, the distal end portion 12a of the parallel male screw 12 is tapered, so that it is parallel when screwed. It can suppress that the edge part of the external thread 12 contacts the edge part of the internal thread 21, and can screw in the water supply pipe | tube 10 easily.

  Further, according to the structure 100 configured as described above, the O-ring 30 is provided between the outer peripheral surface of the copper tube 11 and the inner peripheral surface of the cylindrical space 23 that encloses the copper tube 11. When water flows in from the front end side of the copper tube 11, it is possible to prevent water from leaking from the gap between the outer peripheral surface of the copper tube 11 and the inner peripheral surface of the cylindrical space 23.

  Further, since the O-ring 30 is provided on the distal end side of the copper tube 11 with respect to the spool 13, the O-ring 30 moves in the direction of exiting the cylindrical space 23 due to the pressure of water flowing in from the distal end side of the copper tube 11. Even if an attempt is made, the movement of the spool 13 can be prevented. Therefore, the sealing effect by the O-ring 30 can be made more reliable.

  Here, when a thin threaded copper pipe 11 that is softer than a steel pipe, a SUS pipe, or the like is rolled with a taper screw instead of a parallel screw as in the present embodiment, the copper pipe 11 is attached to the member 20 to be attached. May not be properly tightened. That is, when the taper screw is sealed with an O-ring in the same manner as in the present embodiment, the screwing strength (tensile strength) with the attached member 20 is reduced as compared with a parallel screw. On the other hand, in a general sealing method in which the threaded portion of the taper screw is sealed with a metal seal, there is a risk that the copper tube 11 is deformed due to the tightening stress. Therefore, it is preferable to employ a parallel screw as the rolling screw applied to the thin copper tube 11 as shown in the present embodiment.

  In addition, this invention is not limited to the said embodiment, Unless it deviates from the meaning, it is possible to combine the element of the said embodiment suitably, or to add a various change.

  For example, in the said embodiment, the spool 13 as an annular convex part shall be formed by performing a bulge process with respect to the copper pipe 11. FIG. However, the configuration of the annular convex portion is not limited to this. For example, an annular convex portion may be prepared as a ring-shaped member different from the copper tube 11, and the ring-shaped member may be attached to the copper tube 11 by press-fitting or welding.

  In the above embodiment, the spool 13 is provided in the copper tube 11 to prevent the O-ring 30 from slipping out of the cylindrical space 23. However, the O-ring 30 can be prevented from slipping out by other configurations. is there. For example, an annular groove may be formed on the outer peripheral surface of the copper tube 11 or the inner peripheral surface of the cylindrical space 23, and the O-ring 30 may be fitted into the annular groove. Further, a member other than the O-ring can be used as the seal member.

10: Water supply pipe (screwed copper pipe)
11: Copper tube 12: Parallel male screw 12a: Tip part 13: Spool (annular convex part)
20: Mounted member (mounted body)
21: Female screw 22: Internal space 23: Cylindrical space 24: Opening 25: Chamfered portion 30: O-ring (seal member)
100: Structure

Claims (1)

A parallel male screw is formed by rolling on the end of the copper tube, and a female screw that can be screwed into the parallel male screw is formed on the threaded copper tube with the tip of the parallel male screw tapered. A structure screwed into the attached body,
A cylindrical space communicating with the internal space of the female screw and opened to the outside through an opening is formed in the attached body, and an annular convex portion enclosed in the cylindrical space is formed around the copper tube. It is provided in
A structure in which a seal member is provided between the outer peripheral surface of the copper tube and the inner peripheral surface of the cylindrical space and on the tip side of the copper tube with respect to the annular convex portion.