TWI627365B - Pipe joint construction - Google Patents

Abstract

The utility model relates to a pipe joint structure, which has large pull-out resistance, excellent sealing performance, and can perform piping connection work simply and quickly. The pipe joint structure is provided with a joint body and a pressure retaining ring attached to the joint body. The processing protrusion is protrudingly provided on the thin-walled metal pipe. The inner and outer inclined surfaces are clamped and held, and the pressure retaining ring is axially approached to the top end of the joint body, and the rotation is stopped at a small radial angle to stop each other, and an insertion member is provided to prevent the pressure retention ring from rotating.

Description

Pipe joint structure

The invention relates to a pipe joint structure.

Conventionally, a pipe joint is known, which is connected to the male screw portion of a retainer by a conical female screw portion of a joint body, thereby making the outer tops of several small discs protruding from the inner peripheral surface of the retainer Embedded in the outer peripheral surface of the tube so that the tube does not fall off in the direction of the axis. An embodiment of the above-mentioned pipe joint has been disclosed in Japanese Patent No. 3122385.

However, the pipe joint described in the above-mentioned patent is a small disk that is gradually deepened and inserted in a spiral shape on the outer peripheral surface of the pipe. Therefore, in order to insert the retainer into the joint body, a very large locking force is required, and the work efficiency is Poor disadvantages. Particularly, connection work at a high place is difficult. In addition, because it is structured to prevent falling off by inserting several small disks on the outer peripheral surface of the tube, if a strong extraction force is applied to the tube after the connection is completed, there will be extraction on the outer peripheral surface of the tube at the same time. There is a concern that the long side of the tube may be scratched, or the small disc is broken, causing the tube to come off.

Here, an object of the present invention is to provide a pipe joint structure, which does not require a strong force, can be locked with a small force, can easily and quickly perform connection operations, and does not have a strong force to pull out a pipe. The escaping doubts can be connected reliably and firmly.

The pipe joint structure of the present invention includes a joint body and a pressure retaining ring, the pressure retaining ring is externally attached to the joint body, and a thin-walled metal pipe is spaced apart in the circumferential direction or protrudes around the entire circumference. A plastic processing ridge is provided, and the outer periphery of the top end of the joint body And an inner peripheral part of the pressure retaining ring is provided with a latching means, which is locked with each other by the axial close fitting of the pressure retaining ring and a small radial rotation, and the card With respect to the pressing means, the outer end region of the inner peripheral portion of the pressure retaining ring and the top end region of the inner peripheral portion of the joint body form a clamping state on the outer and inner sides of the metal tube with respect to the convex strip of the metal pipe, The clamping state formed by the latching means is provided with an insertion member that is inserted into the pressure retaining ring in the axial direction to prevent the rotation in the opposite direction from the small-angle rotation.

In addition, the outer end region of the inner peripheral portion of the pressure retaining ring is corresponding to the outer inclined surface of the convex strip of the metal pipe through a closed ring-shaped clamping ring having a tapered inner peripheral surface. The tapered inner peripheral surface formed at the outer end region of the inner peripheral portion of the pressure retaining ring directly corresponds to the outer inclined surface of the convex strip of the metal pipe. In addition, the top end region of the inner peripheral portion of the joint body is corresponding to the inner inclined surface of the convex strip of the metal pipe through a closed ring-shaped clamping ring having a tapered inner peripheral surface. In addition, the top end region of the inner peripheral portion of the joint body directly corresponds to the inner inclined surface of the convex strip of the metal pipe. In addition, the inner peripheral corner of the top end region of the inner peripheral portion of the joint body corresponds to the gentle slope of the foot of the inner slope of the convex strip of the metal pipe in a direct contact manner.

In addition, in the joint system, a plurality of arc-shaped external protrusions and a smooth arc-shaped bottom surface portion are alternately arranged on the outer periphery of the joint. Each arc-shaped external protrusion is composed of a single external protrusion. A snap groove is formed between the protrusions alone, and several arc-shaped inner protrusions are provided on the inner peripheral portion of the pressure retaining ring, and the arc-shaped inner protrusions can arbitrarily be locked within a small radial rotation range. The latching groove portion between the one outer protruding strip unit and an arc-shaped slit portion are provided in the axial direction between the adjacent inner protruding strip portions. The latching means includes a latching groove portion and the arc-shaped inner portion. Protrusions.

In addition, the inserting member has an integral C-shaped or closed annular basic ring portion, and a plurality of protruding pieces protruding from the basic ring portion in the axial direction. The protruding pieces of the inserting member are connected to the latches of the latching means. In the state, the arc-shaped seam of the pressure retaining ring and the smooth arc-shaped bottom surface of the joint body are inserted to prevent the pressure retaining ring from rotating in the opposite direction and maintain the above-mentioned clamping by the latching means. status. At least one of the plurality of protruding pieces is provided with a pull-out prevention The claw or the claw piece. In addition, at least one of the plurality of protruding pieces is provided with a pawl preventing claw or a pawl piece portion, and the pawl preventing claw or the pawl is used for visually confirming the piping connection state. The pieces are colored in a conspicuous color or a high-brightness color.

According to the pipe joint structure of the present invention, the plastic processing protrusion formed on the thin-walled metal pipe is indirectly or directly clamped by the outer end region of the inner peripheral portion of the pressure retaining ring and the top end region of the joint body. In addition, if the insertion member is inserted into the pressure retaining ring from the axial direction by hand, the piping connection operation can be easily completed. That is, the connection work is easy, and piping connection is convenient in various places. In particular, even when a worker performs piping connection in a high place such as a ceiling, there is less concern that the member may fall from a high place, and it does not require labor, so the work can be performed quickly and smoothly. With a simple structure, the force that prevents pull-out is extremely great, preventing the pull-out state, preventing the thin-walled metal pipe from being accidentally pulled out after construction.

1, 2‧‧‧ clamping ring

3‧‧‧Pressure retaining ring

3A‧‧‧Inner periphery

3B‧‧‧ Outer end of inner periphery

3C‧‧‧ tapered inner peripheral surface

3D‧‧‧Straight circumferential surface

4‧‧‧ thin-walled metal pipe (pipe)

4a‧‧‧Top

6, 7‧‧‧ tapered inner peripheral surface

9‧‧‧ (plastic processing) convex strip

9A‧‧‧Outer bevel

9B‧‧‧Inner bevel

10‧‧‧ Connector body

10A‧‧‧Top outer periphery

10B‧‧‧ Inner peripheral tip area

12‧‧‧seals

14‧‧‧seal protection ring

15‧‧‧Circular bottom section

18‧‧‧ recessed ring groove

19‧‧‧ Arc Outer Strip

20‧‧‧ smooth arc-shaped bottom face

21, 22‧‧‧ Outer protrusion

23‧‧‧Catch groove section

25‧‧‧arc seam

30‧‧‧ Arc inside protrusion

32‧‧‧Insert component

33‧‧‧Basic Ring Department

34‧‧‧ Wheel

35‧‧‧ convex strip forming tool

38‧‧‧Medium bore section

39‧‧‧Small Aperture

40‧‧‧ gentle slope

41‧‧‧Inner corner

42‧‧‧Sealed Groove

42A‧‧‧outer wall

43‧‧‧small cutting surface

45‧‧‧Jig

46‧‧‧ Hole

46A‧‧‧Concave groove

47‧‧‧ cylinder

47A‧‧‧Step Department

48‧‧‧fold face

49‧‧‧ short column head

50‧‧‧ spacer cylinder

51‧‧‧elastic ring

52‧‧‧thin diameter shaft

53‧‧‧master

54‧‧‧ outside

55‧‧‧ Spaced convex strip forming jig

56‧‧‧ Fixture body

57‧‧‧Shaft

58‧‧‧Tube grip arm

58A‧‧‧Concave

59‧‧‧tube holding hole

60‧‧‧Circumferential groove

61‧‧‧Guide cylinder

61A‧‧‧Small cylindrical part

61B‧‧‧large cylinder

61C‧‧‧ Folded Noodles

62‧‧‧ round hole

63‧‧‧ bottom wall

64‧‧‧Small Aperture

65‧‧‧ tapered hole

66‧‧‧moving shaft

67‧‧‧ cone shaft

68‧‧‧ Bolt shaft

69‧‧‧Expansion of the operating shaft

70‧‧‧ screw hole

71‧‧‧Drive shaft

72‧‧‧ Arc-shaped convex part forming body

72A‧‧‧ tapered inner side

72B‧‧‧ convex section

75‧‧‧ convex in the circumferential direction

75A‧‧‧End

76‧‧‧Small convex part

81, 82, 83, 84‧‧‧ tabs

82A‧‧‧ Central

82B‧‧‧ Side piece

85‧‧‧Step Department

86‧‧‧Large aperture section

87‧‧‧ gap

88‧‧‧Claw

88B‧‧‧Snap claw section

89‧‧‧small depression

98‧‧‧roller

100‧‧‧ latching means

L‧‧‧ axis

FIG. 1 is a side cross-sectional view of a connected state according to an embodiment of the present invention.

Figure 2: A perspective view of the exploded state.

FIG. 3 is a perspective view sequentially explaining the connection operation of the present invention.

Fig. 4: A cross-sectional view of a state before the insertion member is pressed, in which (A) is an overall cross-sectional view; (B) is an enlarged cross-sectional view of a main part; (C) is an enlarged cross-sectional view of another part.

Fig. 5: An enlarged sectional view of the main parts of other sections. (A) is an enlarged cross-sectional view of the main parts before the insertion member is pushed in; (B) is an enlarged cross-sectional view of the main parts in a connected state.

Fig. 6: An enlarged sectional view of main parts of another embodiment of the present invention, in which (A) is an enlarged sectional view of the main parts before the insertion member is pushed in; (B) is an enlarged sectional view of the main parts in a connected state .

Fig. 7: Working tool for forming convex strips by plastic processing on thin-walled metal pipe and working method thereof Side view.

Fig. 8: A side view of a work tool and a method for forming convex strips at intervals in a circumferential direction on a thin-walled metal pipe.

Fig. 9: A side view of a work tool and a method for forming convex strips at intervals in a circumferential direction on a thin-walled metal pipe.

Fig. 10: Front views of main parts corresponding to Figs. 8 and 9.

Fig. 11 is a front view of a metal pipe in which plastic-processed ridges are formed at intervals in the circumferential direction.

Fig. 12 is a sectional view of another embodiment of the present invention, wherein (A) is a sectional view of a main part; (B) is an enlarged sectional view of a Z portion of (A).

Fig. 13: A cross-sectional view of main parts in a state immediately before connection.

Fig. 14: An exemplified view of the main part of the joint body, in which (A) is a perspective view of the main part; (B) is a front view; (C) is a sectional view of a-O-a of (B).

Fig. 15: An exemplary view of a pressure retaining ring, in which (A) is a front view; (B) is a rear view; (C) is a cross-sectional view of b-O-b of (A).

Fig. 16: An illustration of an insertion member, in which (A) is a front view; (B) is a view in the direction of arrow b of (A); (C) is a view in the direction of arrow c of (A).

FIG. 17 is a cross-sectional view illustrating a method for plastically forming a ridge in a metal pipe.

Fig. 18 is a schematic explanatory diagram of a working procedure for connecting a metal pipe and a joint.

Fig. 19: A cross-sectional view of a specific shape of a plastic-processed ridge.

In order to make the above and other objects, features, and advantages of the present invention more comprehensible, the following describes the preferred embodiments of the present invention and the accompanying drawings in detail, as follows: Figures 1 to 5 In one embodiment, 4 is a thin-walled metal tube, and a plastic-processed protrusion 9 is provided (formed) from the top end 4a to a predetermined size position. The pipe joint structure of the present invention includes a joint body 10 and a pressure retaining ring 3, and the joint body 10 is inserted into the thin-walled metal. The tube 4 and the pressure retaining ring 3 are attached to the joint body 10 in an external fitting manner. The thin-walled metal pipe 4 (hereinafter may be simply referred to as the pipe 4) is a stainless steel pipe as specified in JIS G3448, and is mainly used for piping for water supply, hot water supply, or drainage. The relationship between the outer diameter D and the thickness dimension t of the thin-walled metal pipe 4 is shown in Table 1. The thin-walled metal pipe 4 preferably has an outer diameter D of 10 mm to 65 mm, and a thickness dimension t of 1.0 mm to 1.6 mm.

The plastic-processed ridges 9 of the thin-walled metal pipe 4 are provided at intervals in the circumferential direction (see FIG. 11), or are provided around the entire circumference (360 degrees). The convex strip 9 has a triangular mountain shape as shown in FIG. 19 (A), a triangular mountain shape with an arc top as shown in FIG. 19 (B), or a round hill shape as shown in FIG. 19 (C). In addition, a locking means 100 is provided at the top outer peripheral portion 10A of the joint body 10 and the inner peripheral portion 3A of the pressurizing retaining ring 3. That is, as shown in FIG. 3, the pressure holding ring 3 approaches (mutually) in the axial direction indicated by the arrow N. The fitting and the small-diameter rotation in the radial direction indicated by the arrow M make the outer peripheral portion 10A of the top end of the joint body 10 and the inner peripheral portion 3A of the pressure retaining ring 3 latch with each other by the latching means 100 and the pressure retaining ring 3 The latching state is maintained in the axial direction without being separated by the joint body 10.

In addition, 32 is an insertion member. By the above-mentioned latching means 100, the outer end region 3B of the inner peripheral portion of the pressure retaining ring 3 and the tip end region 10B (in the first to fifth figures) of the inner peripheral portion of the joint body 10 are indirectly opposed to the ridges of the tube 4. 9. Form a clamping state on the outer side and the inner side in the axial direction, and in order to maintain the above-mentioned clamping state formed by the above-mentioned latching means 100, the pressurizing retaining ring 3 is represented by (shown by arrow P in FIG. 3 (D) ) Is inserted into the insertion member 32 in the axial direction to prevent the rotation in the opposite direction of the small-angle rotation (M). In other words, the insertion member 32 is a member for preventing the pressure holding ring 3 from being loosened.

In addition, it will be described that the outer end region 3B of the inner peripheral portion of the pressure retaining ring 3 is “indirectly” pressurized (corresponding) from the axially outer side with respect to the ridge 9 of the metal pipe 4 and the outer end region 3B of the inner peripheral portion is transmitted through The closed ring-shaped clamping ring 1 (of soft metal or hard resin, etc.) having a tapered inner peripheral surface 6 corresponds to the outer inclined surface 9A of the (pressurized) ridge 9. In addition, it is explained that the inner peripheral tip region 10B of the joint body 10 is “indirectly” pressurized (corresponding) from the axially inner side with respect to the ridge 9, and the inner peripheral tip region 10B passes through the tapered inner peripheral surface 7. The closed annular clamping ring 2 (of hard resin or the like) corresponds to the inner inclined surface 9B of the (pressurized) ridge 9.

In the embodiment of FIGS. 1 to 5, in the connected state, the tapered inner peripheral surfaces 6 and 7 of the two clamping rings 1 and 2 correspond to the outer inclined surface 9A and the inner inclined surface 9B of the convex strip 9. While keeping. In addition, as shown in FIG. 5, the outer end region 10B of the inner peripheral portion of the joint body 10 is formed with a large-aperture portion 86 by a stepped portion 85, and a seal protection ring 14 (a seal such as an O-ring) is sequentially inserted from the inside. 12 and the clamping ring 2. In the unconnected state, it is preferable that the above-mentioned three members are fitted into the large-diameter portion 86 of the joint body 10 in advance. This is because the clamping rings 1 and 2 of the small components will not be disassembled (will not fall off) before the connection operation, which can improve the workability. The material of the clamp rings 1 and 2 is preferably a soft metal such as copper or a heat-resistant hard resin such as PPS, PPSU, or PSU.

Next, the convex strip 9 of the present invention is provided in a closed loop 360 degrees around the metal pipe 4 and, as shown in FIG. 11, viewed from the axial center L direction, it is provided protruding apart from the circumferential direction (divided). Situation. Fig. 11 shows the case where the convex strips 9 are divided into four, which can be freely reduced to two or three, or conversely increased to five to eight. (A manufacturing method and a working tool are described later with reference to FIGS. 8 to 10).

In addition, the joint body 10 is formed with a large-aperture portion 86 by a stepped portion 85, and a flat washer-shaped seal protection ring 14 is attached to the inside of the large-aperture portion 86 to abut the stepped portion 85. In addition, as shown in FIG. 5, a part of the seal 12 and the retaining ring 2 of the O ring and the like are sequentially attached. Among them, the seal protection ring 14 effectively prevents the sealed fluid (hot water, cold water, etc.). Ozone (active oxygen), chlorine gas, and hydrogen gas mixed in cause the above-mentioned seal 12 to corrode or deteriorate after long-term use. The inner and outer edges of the seal protection ring 14 are tightly crimped to the (inserted) metal pipe. The outer peripheral surface of 4 and the inner peripheral surface of the large-aperture portion 86 prevent the sealed fluid from directly contacting the seal 12.

The clamp ring 2 (in an unconnected state) is pre-fitted in a state of being press-fitted into the large-aperture portion 86 of the joint body 10, and the inner end surface, the stepped portion 85 and the large-aperture portion 86 of the clamp ring 2 are inserted. A concave ring groove portion 18 is formed on the inner peripheral surface of the inner peripheral surface. The concave ring groove portion 18 holds the protection ring 14 and the seal 12. In addition, the joint body 10 is formed inside the large-aperture portion 86 to form a middle-aperture portion 38, which is slightly larger than the outer diameter D (see FIG. 4) of the metal pipe 4. That is, the large-aperture portion 86 and the middle-aperture portion 38 are formed in the step portion 85 in sections. In addition, the top end 4a of the inserted metal tube 4 abuts the inner side of the middle aperture portion 38, and a positioned circular bottom section portion 15 is formed, and the inner side thereof forms a small aperture portion 39. The metal pipe 4 is connected (connected) to the pipe joint by the circumferential bottom section 15 and the clamping ring 1 which is subjected to the pressure F accompanying the attachment of the pressure holding ring 3 without being shaken in the axial direction.

Next, another embodiment is shown in FIG. 6. This pipe joint structure also has a joint body 10 and a pressure retaining ring 3, but the pressure retaining ring 3 is in the shape of a cap nut, and is connected to the inner periphery. The outer outer end region 3B has a tapered inner peripheral surface 3C having a radius that is reduced toward the top opening. As shown in FIG. 6, when the pressure retaining ring 3 is attached to the joint body 10, the tapered inner peripheral surface 3C of the pressure retaining ring 3 is directly crimped to the outer inclined surface 9A of the ridge 9 and has a tapered shape. The inner peripheral surface 7 of the closed annular clamping ring 2 of the inner peripheral surface 7 is crimped to the inner inclined surface 9B of the convex strip 9 and is configured to clamp and hold the metal tube 4 in the axially outer direction and the axially inner direction. Convex strip 9. That is, the tapered inner peripheral surface 3C formed in the inner peripheral portion outer end region 3B of the pressure holding ring 3 directly corresponds to the outer inclined surface 9A of the ridge 9 of the metal pipe 4.

Next, other embodiments shown in Figs. 12 to 17 will be described. The ridge 9 formed by plastic working on the metal pipe 4 has a round hill shape, and a large arc shape is also formed at the top (see FIG. 19 (C)). Moreover, the tip end region 10B of the inner peripheral portion of the joint body 10 directly corresponds to the inner inclined surface 9B of the ridge 9 of the metal pipe 4. Particularly in the drawings, the inner peripheral corner portion 41 of the inner peripheral top end region 10B of the joint body 10 corresponds to the protrusion 9 of the lower arc mountain shape (round hill shape) of the metal pipe 4 in a direct contact manner. The gentle slope 40 at the foot of the inner slope 9B. In this way, the corner portion 41 of the joint body 10 directly contacts the inner inclined surface 9B of the ridge 9 with a metal touch, without the clamping ring 2 shown in FIGS. 1 to 6 interposed therebetween.

A sealing groove 42 is recessed in the top end region 10B of the inner peripheral portion of the joint body 10. A sealing member 12 and a protective ring (flat washer) 14 are installed in the sealing groove 42. With the existence of the outer side wall 42A of the sealing groove 42, the inner peripheral corner portion 41 can directly correspond to (contact) the gentle slope 40 of the mountain foot. In addition, as shown in FIG. 12 and FIG. 13, the inner peripheral corner portion 41 may be a sharp angle, or as shown in FIG. 14 (C), a small cutting surface 43 may be made to reduce the Contact surface pressure. In addition, it can be said that the middle hole portion 38 is concavely provided with a sealing groove 42, and a circular bottom section 15 is provided in the inside, so that the top end 4 a of the inserted metal pipe 4 can abut, but not further (inward). Go deep, but bottom out and stop.

Next, the latching means 100 and related structures will be described. 12, 13, 14, and 2 to 5 and 6, the joint body 10 is attached to the outer periphery of the tip. 10A alternately arranges a plurality of arc-shaped outer protrusions 19 and a smooth arc-shaped bottom surface portion 20. In addition, each of the arc-shaped outer ridge portions 19 is composed of an outer ridge portion 21, 22, and a catch groove 23 is formed between the outer ridge portions 21, 22. On the other hand, the inner peripheral portion 3A of the pressure retaining ring 3 is provided with a plurality of arc-shaped inner ridge portions 30. The arc-shaped inner protruding portion 30 can be locked to the locking groove portion 23 on the joint body 10 side in a radial (see arrow M) "small angle" rotation range. In the case where there are four inner protrusions 30 at intervals of 90 degrees, the "small angle" is about 45 degrees.

In addition, it is possible to freely set two, three, or six of the inner protruding strip portion 30 and the latch groove portion 23, and the "small angle" in these cases is approximately 90 degrees, 60 degrees, and 30 degrees. In addition, an arc-shaped slit portion 25 is provided between the adjacent inner ridge portions 30 in the pressure retaining ring 3 so as to penetrate in the axial direction. It can be said that the latching means 100 includes at least a latching groove portion 23 and an arc-shaped inner protruding portion 30. More specifically, the latching means 100 includes a protruding portion 19, a smooth arc-shaped bottom surface portion 20, a latching groove portion 23, and an arc-shaped inner protruding portion 30.

Next, the insertion member 32 will be described. The insertion member 32 has a case of having a C-shaped basic ring portion 33 as shown in FIG. 16 and a case of having a closed annular basic ring portion 33 as shown in FIGS. 2 and 3. In this manner, the basic ring portion 33 is provided with a plurality of protruding pieces 81, 82, 83, and 84 protruding in the axial direction. In FIG. 16, the convex pieces 81 and 82 and the basic ring portion 33 are integrally formed of synthetic resin. The cross section of the two convex pieces 81 disposed at 180 degrees in opposite directions has a simple arc shape and a C-shaped basic ring portion. The notched portion 87 of 33 is provided at 180 degrees in the opposite direction, and the convex piece 82 is divided into three pieces, and is composed of a central piece 82A and left and right side pieces 82B. A catch claw 88 is provided at the top end of the side piece 82B. In addition, the small latch claw 88 shown in FIG. 16 has a shape protruding in the circumferential direction.

The insertion member 32 shown in FIGS. 2 and 3 is described. The two protruding pieces 83 and two protruding pieces 84 protruding from the closed annular basic ring portion 33 are arranged at intervals of 90 degrees in the circumferential direction, and the cross-section is arc-shaped. . The pair of convex pieces 84 are integrally formed with a claw-shaped separating line to form the latching claw piece portion 88B. In addition, the protruding pieces 81, 82, 83, and 84 of the inserting member 32 are in the latching state of the latching means 100, with respect to the arc-shaped slit portion 25 of the pressure retaining ring 3 and the smooth arc-shaped bottom of the joint body 10. The face 20 is inserted. That is, as shown in FIG. 3 (C), when the pressure holding ring 3 is rotated at a small angle in the direction of the arrow M, the latching means 100 becomes a latching state, and at the same time, the arc-shaped slit portion 25 and the smooth arc shape The bottom surface portion 20 is relatively the same position in the circumferential direction, and the arc-shaped slit (gap) is formed into a through shape from the axial viewing system, such as (D) in FIG. 3, (B) in FIG. 5, and (( B) and FIG. 12, the convex pieces 81, 82, 83, and 84 are inserted into the penetrating arc-shaped seam (gap).

In addition, while the protruding pieces 81, 82, 83, and 84 are inserted into the through-arc-shaped seam (gap), the latching claw piece portion 88B is as shown in FIG. 5 (B) and FIG. 6 (B As shown in the figure, the retaining ring 3 is locked, or the locking claw 88 (refer to FIG. 16) is locked at the small recess 89 of the protruding bar unit 21 outside the joint body 10 to prevent the insertion member 32 from being pulled out. In this way, the insertion member 32 is inserted in the direction of the arrow P to prevent the pressure holding ring 3 from rotating in the reverse direction (toward the arrow M), and the clamping state of the convex strip 9 by the latching means 100 is maintained.

As the work tool for forming the convex strip 9 on the thin-walled metal pipe 4 (a full 360-degree circle), the convex strip forming tool 35 illustrated in FIG. 7 can be used. The roller 34 with the small convex strip is inserted into the metal tube 4, and the roller 34 is opposed to the roller 98 with the circumferential groove, and the convex strip 9 can be simply formed by rotating the whole. The working tool (protrusion forming tool 35) shown in FIG. 7 above is suitable for forming a complete 360-degree turn of the protuberance 9. In addition, it is also possible to use the interval protruding tools shown in FIGS. 8 to 10 to form a jig 55 with a gap. The ground protrusions form ridges as shown in FIG. In other words, the ridge 9 is composed of four circumferential-direction convex portions 75. This jig 55 is unique to the present inventor, and its structure and usage method (function) will be briefly described below.

Reference numeral 56 is a jig body (working tool body). A pair of tube gripping arms 58 are pivotally pivoted through the shaft portion 57 and have a semicircular arc-shaped recess 58A. In the closed state, a 360-degree tube holding hole is formed. 59. In addition, fasteners such as bolts and nuts not shown may be used to securely form and hold the 360-degree tube holding hole 59. In addition, a circumferential groove 60 is formed in the holding hole 59, and the circumferential groove 60 serves as a female mold for forming the convex strip 9. Processed thin The top end portion of the wall metal pipe 4 is inserted into a pipe holding hole 59 having the circumferential groove 60 and is grasped.

61 is a guide cylinder constituting a part of the jig body 56, and has a small cylindrical portion 61A and a large cylindrical portion 61B. The small cylindrical portion 61A has an outer diameter slightly smaller than the inner diameter of the metal pipe 4. The large circle The outer diameter dimension of the cylindrical portion 61B is larger than the outer diameter dimension of the small cylindrical portion 61A. The folded surface 61C of the small cylindrical portion 61A and the large cylindrical portion 61B is a “contact surface” for positioning the tip end surface of the metal pipe 4 to be processed. The large cylindrical portion 61B has a concentric circular hole portion 62 and a small aperture portion 64. The circular hole portion 62 opens toward the left in FIGS. 8 and 9. The small aperture portion 64 is provided in FIG. 8. And the bottom wall portion 63 on the right side of FIG. 9. In addition, a tapered hole 65 is provided through the bottom wall portion 63 and the small cylindrical portion 61A, and the tapered hole 65 gradually expands in diameter toward the side where the pipe gripping arm 58 exists (referred to as the tip side), and is similar to the above-mentioned circle. The shaped hole portion 62 and the small hole portion 64 are concentric.

The moving shaft body 66 is inserted along the axis of such a guide cylinder 61 and can be arbitrarily moved back and forth. The moving shaft body 66 includes an inversely tapered tapered shaft portion 67, an expanded operating shaft 69, and a drive shaft portion 71. The tapered shaft portion 67 gradually expands in diameter toward the tip. The expanded operating shaft 69 has a bolt shaft portion 68. The drive shaft The portion 71 is inserted into the circular hole portion 62 arbitrarily, and has a screw hole 70. The bolt shaft portion 68 is screwed (connected) to the screw hole 70 of the drive shaft portion 71, and the bolt shaft portion 68 and the drive shaft portion 71 are moved back and forth in the axial center direction together. The drive shaft portion 71 is linked to a hydraulic cylinder (not shown in the left direction in FIGS. 8 and 9) or an electric drive mechanism. In addition, as shown in FIGS. 8, 9, and 10, four fan-shaped arc-shaped convex-portion forming bodies 72 are attached to the tapered shaft portion 67 in an external fitting manner. The tapered inner side surface 72A of the arc-shaped convex portion forming body 72 is slidably in contact with the tapered shaft portion. The outer surface of the arc-shaped convex portion forming body 72 has a convex portion 72B as shown in FIG. 11. 72B forms ridges 9 on the metal pipe 4 at intervals.

That is, the convex portion 72B of the arc-shaped convex portion forming body 72 serves as a male mold, and the actuating shaft is expanded from the state of (A) of FIGS. 8 and 10 with respect to the circumferential groove 60 serving as a female mold. 69 By an unillustrated driving mechanism, as shown in FIG. 9 and FIG. 10 (B), the arrow Z direction is moved, and the inner side of the metal pipe 4 is directed to the arrow Y direction (radial outward direction) in FIG. 9. Make Then, the metal pipe 4 (as shown in FIG. 11) is plastically processed at intervals to form ridges 9 (four convex portions 75). In the case where the convex strip 9 has a triangular mountain shape, the inner side of the metal pipe 4 is preferably formed with a sufficiently sharp (having a vertex) triangular mountain concave portion. For this reason, the convex portion 72B of the arc-shaped convex portion forming body 72 is also preferable. It is a triangular mountain shape with sharp vertices. In addition, as in the case of (B) or (C) in FIG. 19, the convex portion 9 has an arc shape or a round hill shape, and the convex portion 72B has an arc (arc shape).

In addition, the descriptions in FIGS. 8 to 11 show the case where the plastic-processed ridges 9 are formed by four convex portions 75, but it may be reduced to two or three, or increased to five to nine. In addition, the advantages of forming the ridges 9 formed by the plurality of convex portions 75 at intervals as described above will be described below. As shown in the example of FIG. 11, when each convex portion 75 is viewed from the axial center direction, the circumferential end portion 75A of the convex portion 75 has a three-dimensional shape (shell structure) and has a reduced mountain shape. This end portion 75A is difficult to apply when an external force acts. Deformation and high rigidity. Therefore, when the connection is completed in Figures 1, 5 (B), 6 (B), and 12 and the pull-out force acts on the metal pipe 4, it can play a role in preventing protrusions. The deformation of the strip 9 increases the pull-out endurance.

Next, in FIG. 17, another method and a jig for forming the ridges 9 by plastic working on the metal pipe 4 will be described. The upper half above the axis L indicates the state before plastic working, and the lower half below the axis L indicates the state after plastic processing. In the left side of FIG. 17 (not shown), a rod for linear reciprocating cylinders such as a manual pump or an electric pump is provided, or a linear reciprocating section such as a rod for an electric linear reciprocating actuator is connected. Rod shaped jig 45.

The metal pipe 4 to be processed has a body 47 at its tip, and the body 47 is provided with a hole portion 46 that can be inserted only in a small size. The jig 45 has a short column head 49, and the outer diameter of the top of the short column head 49 is set to be tightly fitted into the metal tube 4 with the folded surface portion 48. The top end 4a of the metal pipe 4 is connected to the stepped portion 47A on the inner side of the hole of the pillar 47 for operation. In addition, 50 is a spaced cylinder, 51 is an elastically deformable elastic ring such as rubber, the spaced cylinder 50 and the elastic ring 51 are externally embedded in the small diameter shaft 52 of the jig 45, and simultaneously bear between the stepped portion 47A and the folded surface portion 48. Axial force, the elastic ring 51 can be elastically deformed from the initial short cylindrical shape to the axis L The following shape partially expands and deforms the metal tube 4 in the externally fitted state.

In addition, in FIG. 17, the master mold 53 necessary for the above-mentioned expansion deformation (plastic working) is a member itself constructed using a pipe joint. That is, the pressure retaining ring 3 illustrated in FIG. 15 is used. Specifically, the outer surface 54 of the top end portion of the pillar 47 is provided with a single convex strip 22, a latch groove portion 23, and a rounded bottom surface portion 20 as shown in FIGS. 13 and 14 (A). In this way, the pressurizing retaining ring 3 used directly on the predetermined metal pipe 4 is used as the female mold 53 and is mounted on the outer surface 54 of the top end of the column 47 in a locked state.

As shown in FIG. 17, it is difficult to form the convex strip 9 into a shape like (B) or (C) of FIG. 19 only with the master mold 53, but at the top of the pillar 47, the small convex portion 76 and the hole portion The recessed groove 46A at the open end of 46 is added to the inner peripheral surface 3C of the female mold 53 (acting together) to form a female concave portion structure. The small convex portion 76 is slightly inserted into FIG. 15 ( (C) A straight circumferential surface 3D (connected to the inner peripheral surface of the cone 3C). The recess for the female mold corresponds to a triangular mountain shape whose top is an arc shape as shown in (C) of FIG. 19 or as shown in FIG. 19. (B) The shape of a round hill. With the actuator and the like on the left side of FIG. 17, the jig 45 moves in the direction of the arrow K like the upper half to the lower half in the figure, whereby the outer peripheral surface of the elastic ring 51 is elastically expanded and deformed, as shown by the arrow. As shown at P ₅₁ , a convex stripe 9 is partially formed on a full 360-degree turn of the metal pipe 4.

The shape of the tip outer peripheral portion 10A of the joint body 10 shown in FIG. 14 is directly formed on the outer face 54 of the tip portion of the cylinder 47, so the pressure holding ring 3 is rotated by a small angle in the direction opposite to the direction of the arrow M, and the The pressure retaining ring 3 is separated together with the metal pipe 4. At this time, the jig 45 and the like are also separated by the metal pipe 4 and become the state of FIG. 13. In the same manner as the description of FIG. 3, in the order of (A) → (B) → (C) → (D), That is, the connection operation can be performed in the order of arrows N → M → P. According to the ridge forming apparatus and method of FIG. 17, the ridge 9 of the shape (B) or (C) of FIG. 19 can be formed simply, quickly, and with high accuracy.

In addition, as shown in FIG. 3 and FIG. 18, after the metal pipe 4 is inserted into the joint body 10 as shown in FIG. 3 and FIG. 18, (i) the pressure retaining ring 3 is pushed in the arrow N direction (axial direction), and then (ii) Rotate the pressure holding ring 3 by a small angle in the direction of arrow M to switch to the state of being held by the latching means 100, and then (iii) insert the insertion member 32 in the direction of arrow P, which can be easily and quickly performed to the connection Done status.

According to the present invention, the existence of the ribs 9 formed on the metal pipe 4 and the outer peripheral end region 3B of the inner peripheral portion of the pressure retaining ring 3 and the inner peripheral end region 10B of the joint body 10 The inner side holds the above-mentioned convex strip 9 in a clamped state, which exerts a strong pull-out resistance. The embodiments shown in Figs. 1 to 5 and 6 are shown in this clamped state. The joint body 10 and the metal pipe 4 are in the axial direction (along the In the direction of the axis L), the system is relatively hardly moved or completely fixed. Ideally, it can exert strong pull-out resistance and high sealing performance.

However, in other embodiments shown in FIGS. 12 to 17, the top of the ridge 9 is formed in an arc shape (refer to (B) in FIG. 19) or a round hill shape as a whole (refer to (C) in FIG. 19). In the case where the top end region 10B of the inner peripheral portion of the joint body 10 directly abuts, it can also be configured to relatively move relatively in the axial direction, and, as shown in FIG. 12, the sealing member 12 is engaged in an independent sealing groove. 42 without being adversely affected by the above-mentioned slight movement, so the sealing performance can be ensured, and the tapered inner peripheral surface 3C of the pressure retaining ring 3 is relatively large in contact area with respect to the protrusion 9 with respect to the pull-out force. The outer inclined surface 9A is crimped, so that the metal pipe 4 is not damaged, and a sufficient pull-out resistance can be exerted.

In this way, in the state where the connection is completed, the joint body 10 and the metal pipe 4 may move slightly in the axial direction. In addition, it is preferable that the top end 4a of the metal pipe 4 can correspond to the bottom section 15 inside the hole of the joint body 10, and the function of preventing the metal pipe 4 from moving in the axially inner direction can be exerted to reduce (or even prevent) the above-mentioned slight movement. . In addition, it is preferable that the claw piece 88b illustrated in FIG. 3 (B), FIG. 5 (B), and FIG. 6 (B) or the claw 88 illustrated in FIG. 16 be colored red. Or yellow or other bright colors or high brightness colors. The coloring method may be a method of manufacturing the insert member 32 by plastic two-color molding, or a method of coloring by coating or adhering a color sheet on the outside of the latching claw piece portion 88b and the latching claw piece 88b. As a result, there is The advantages of the piping connection can be confirmed visually and reliably (the advantage of preventing defects in piping connection work).

As described above in detail, the present invention includes a joint body 10 and a pressure retaining ring 3, which is attached to the joint body 10 in an external fitting manner, and the thin-walled metal pipe 4 is spaced apart in the circumferential direction or A processing ridge 9 is protruded around the entire circumference. A top end outer peripheral portion 10A of the joint body 10 and an inner peripheral portion 3A of the pressure retaining ring 3 are provided with latching means 100 which are held by the pressure. The axially close fitting and radial small-angle rotation of the ring 3 are locked with each other. By the above-mentioned locking means 100, the outer end region 3B of the inner peripheral portion of the retaining ring 3 and the top end of the inner peripheral portion of the joint body 10 are pressurized. The area 10B forms a clamping state on the outer side and the inner side of the metal tube 4 in the axial direction, and in order to maintain the clamping state formed by the latching means 100, an insertion member 32 is provided. The insertion member 32. The pressure holding ring 3 is inserted in the axial direction to prevent the rotation of the small angle rotation in the opposite direction. Therefore, the pressure holding ring 3 does not need to be rotated several times like the conventional cap nut, for example, it only rotates 15 ° ~ 90. The small angle of ° becomes the clamping state, which can be easily and quickly advanced. Connection work. In addition, after inserting the insertion member 32 axially with respect to the pressure-retaining ring 3, the pressure-retaining ring 3 is not loosened, and the connection completion state is maintained directly, so that the overall operation can be performed more easily and quickly. In addition, if the insertion member 32 is in a state where it cannot be inserted, the worker can simply know that the small-angle rotation of the pressure retaining ring 3 (in the previous step) is insufficient, so that the worker can directly know the clamping state. Insufficient work, etc. In addition, the worker can easily visually confirm whether or not the insertion member 32 is inserted sufficiently deep in the axial direction. In this way, piping connection work can be performed simply, reliably, and quickly, and in particular, a worker can easily and quickly perform piping connection in a small space or a ceiling. In addition, the structure can be simplified, and since the convex strip 9 is clamped in two directions in the structure, the force for preventing the piping from being pulled out becomes extremely large, and accidents such as accidentally pulling out the metal pipe after construction can be prevented.

In addition, the outer end region 3B of the inner peripheral portion of the pressure retaining ring 3 corresponds to the outer inclined surface 9A of the ridge 9 of the metal pipe 4 through a closed annular clamping ring 1 having a tapered inner peripheral surface 6. Therefore, with respect to the outer inclined surface 9A of the convex strip 9, the clamping ring 1 is stably and tightly brought into a crimped state. (Clamping state) Stably ensures a large pull-out endurance. In addition, even when a large bending moment acts on the metal pipe 4, it acts as a buffer on the clamp ring 1 to prevent damage to the retaining ring 3 and the like.

In addition, the tapered inner peripheral surface 3C formed on the outer end region 3B of the inner peripheral portion of the pressure retaining ring 3 directly corresponds to the outer inclined surface 9A of the ridge 9 of the metal pipe 4, so (as shown in FIG. 6 and FIG. 12) (Shown in the figure) The number of components is reduced, and although it is a metal contact, the contact pressure between the outer inclined surface 9A and the tapered inner peripheral surface 3C is small. Even if the pulling force or bending moment acts on the metal tube 4, a stable posture can be maintained. Fully pull out endurance.

In addition, the tip end region 10B of the inner peripheral portion of the joint body 10 corresponds to the inner inclined surface 9B of the ridge 9 of the metal pipe 4 through the closed ring-shaped clamping ring 2 having a tapered inner peripheral surface 7, so that Stably resists the pressure applied to the axially inner direction of the metal pipe 4 to prevent the metal pipe 4 from excessively moving to the inside of the joint body 10, or the two shaft centers of the metal pipe 4 and the joint body 10 are inclined and eccentric, which can maintain a good Sealing performance.

In addition, the tip end region 10B of the inner peripheral portion of the joint body 10 directly corresponds to the inner inclined surface 9B of the ridge 9 of the metal pipe 4 (as shown in FIGS. 12, 13 and 14), so that the axial direction can be shortened. The size can also reduce the number of components. In addition, it can sufficiently withstand the external force that presses the metal pipe 4 into the inside of the joint body 10. In addition, the joint body 10 is formed with a bottom section 15 that is abutted by the top end 4a of the metal pipe 4 to withstand the external force of the press-in and prevent the protruding strip 9 from moving slightly in the axial direction.

In addition, if the inner peripheral corner portion 41 of the inner peripheral top end region 10B of the joint body 10 is in direct contact with the mountain slope 40 of the inner slope 9B of the convex strip 9 of the metal pipe 4, the joint body can be simplified The shape of the end face other than 10 (refer to FIGS. 13 and 14) can be simplified. It is also advantageous in terms of the strength of the ridge 9. Even if the metal pipe 4 moves slightly in the axial direction, there is no problem in the pull-out endurance, and it can be said that it is excellent in practicality.

In addition, the joint body 10 is configured by arranging a plurality of arc-shaped outer ridge portions 19 and a smooth arc-shaped bottom surface portion 20 alternately on the top outer peripheral portion 10A thereof. The protruding ribs 21 and 22 are formed. A latching groove 23 is formed between the outer protruding ribs 21 and 22. In addition, the inner peripheral portion 3A of the pressure retaining ring 3 is provided with a plurality of arc-shaped inner protruding portions 30. The arc-shaped inner ridge portion 30 can arbitrarily lock the ridge groove portion 23 between the outer ridge portions 21 and 22 within a small radial rotation range, and the adjacent inner ridge portion 30 An arc-shaped slit portion 25 is provided in the axial direction therethrough. The latching means 100 can be said to have at least a latching groove portion 23 and the arc-shaped inner protruding strip portion 30, so that the pressure retaining ring 3 can be strongly and surely prevented. The movement of the joint body 10 in the axial direction is sure to maintain the clamping state. In addition, the worker can quickly and easily switch (rotate). In addition, a through-arc-shaped seam that can be easily inserted into the insertion member 32 later can be automatically formed with mutual engagement, and the insertion operation of the next insertion member 32 can be performed smoothly. That is, the steps of arrow N → M → P shown in FIG. 18 can be smoothly performed.

In addition, the inserting member 32 has an integral C-shaped or closed annular basic ring portion 33, and a plurality of protruding pieces 81, 82, 83, and 84 protruding from the basic ring portion 33 in the axial direction. The protruding pieces 81, 82, 83, and 84 are inserted in the latching state of the latching means 100, and are inserted into the arc-shaped slit portion 25 of the pressure retaining ring 3 and the rounded arc-shaped bottom surface portion 20 of the joint body 10. To prevent the pressure retaining ring 3 from rotating in the opposite direction and maintain the clamping state by the latching means 100, so the worker can easily insert the pressure retaining ring 3, which helps to achieve rapid piping connection work, And prevent accidental separation leading to fluid leakage. In addition, at least one of the plurality of protruding pieces 81, 82, 83, and 84 is provided with a locking claw 88 or a locking claw piece portion 88B, which prevents the insertion member 32 from being accidentally detached and maintains the piping connection. status. In addition, at least one of the plurality of tabs 81, 82, 83, and 84 is provided with a pawl preventing claw 88 or a pawl tab portion 88B, and the unplugging prevention can be visually confirmed by the piping connection completion state. The disengaged latch claw 88 or the latch claw piece 88B is colored in a conspicuous color or a high-brightness color. Therefore, it is possible to reliably confirm that the piping connection is completed, and to prevent water leakage caused by the piping connection failure.

Although the present invention has been disclosed by using the above-mentioned preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can compare with the above without departing from the spirit and scope of the present invention. Various changes and modifications in the embodiments still belong to the technical scope protected by the present invention. Therefore, the protection scope of the present invention shall be determined by the scope of the attached patent application.

Claims (10)

A pipe joint structure includes a joint body and a pressure retaining ring. The pressure retaining ring is externally attached to the joint body. A thin-walled metal pipe system is arranged at intervals in the circumferential direction or protrudes around the entire circumference. Plastic processing ridges, the outer peripheral part of the top end of the joint body and the inner peripheral part of the pressure retaining ring are provided with a latching means, which is fitted and radial with the axial proximity of the pressure retaining ring. Rotate at a small angle to latch each other. With the latching means, the outer end region of the inner peripheral portion of the pressure retaining ring and the top end region of the inner peripheral portion of the joint body are axially opposite to the convex strip of the metal pipe. The outer side and the inner side form a clamping state, and in order to maintain the clamping state formed by the locking means, an insertion member is provided, which is inserted into the pressure retaining ring in the axial direction to prevent the small angle rotation from the opposite direction. Spin. The pipe joint structure according to item 1 of the scope of patent application, wherein the outer end area of the inner peripheral portion of the pressure retaining ring is closed with respect to the outer inclined surface of the convex strip of the metal pipe through a tapered inner peripheral surface. A ring-shaped clamping ring corresponds. The pipe joint structure according to item 1 of the scope of patent application, wherein the tapered inner peripheral surface formed on the outer end region of the inner peripheral portion of the pressure retaining ring directly corresponds to the outer inclined surface of the convex strip of the metal pipe. The pipe joint structure according to item 1 of the scope of the patent application, wherein the top end region of the inner peripheral portion of the joint body is opposite to the inner inclined surface of the convex strip of the metal pipe through a closed annular portion having a tapered inner peripheral surface. Clamp ring to correspond. The pipe joint structure according to item 1 of the scope of patent application, wherein the top end region of the inner peripheral portion of the joint body directly corresponds to the inner inclined surface of the convex strip of the metal pipe. The pipe joint structure according to item 1 of the scope of patent application, wherein the inner peripheral corner portion of the top end region of the inner peripheral portion of the joint body is in a direct contact manner with a gentle slope corresponding to the inner slope of the inner slope of the metal pipe . The pipe joint structure described in item 1 of the scope of the patent application, wherein the joint system alternately arranges a plurality of arc-shaped outer protrusions and a smooth arc-shaped bottom surface on the outer periphery of the top end thereof, and each of the arc-shaped outer protrusions It is composed of a single external protruding strip, a snap groove is formed between the single external protruding strips, and a plurality of arc-shaped internal protruding strips are provided on the inner peripheral part of the pressure retaining ring. The projecting portion can arbitrarily latch the latching groove portion between the one external projecting unit within the radial small-angle rotation range, and an arc-shaped slit portion is axially penetrated between the adjacent inner projecting portions in the axial direction. The latching means includes a latching groove portion and the arc-shaped inner protruding strip portion. The pipe joint structure according to item 7 of the scope of the patent application, wherein the inserting member has an integral C-shaped or closed ring-shaped basic ring portion, and a plurality of protruding pieces provided in the axial direction from the basic ring portion, the The protruding piece of the inserting member is inserted in the latching state of the latching means with respect to the arc-shaped seam of the pressure retaining ring and the rounded arc-shaped bottom surface of the joint body to prevent the pressure retaining ring from being reversed. Rotate in direction to maintain the above-mentioned clamping state by the latching means. The pipe joint structure according to item 8 of the scope of the patent application, wherein at least one of the plurality of protruding pieces is provided with a catching claw or a catching claw piece portion. The pipe joint structure according to item 8 of the scope of patent application, wherein at least one of the plurality of tabs is provided with a pawl or a pawl piece portion for preventing detachment, and in order to visually confirm that the piping connection is completed State, the pawl or the pawl piece portion for preventing pull-out is colored in a conspicuous color or a high-brightness color.