TWI595938B - Pipe joint and bolt accommodated cap nut - Google Patents

Description

Pipe joint and screw storage cap nut

The present invention relates to a tubular body joint.

A conventional pipe joint will be described with reference to Figs. 5 to 7 .

Fig. 5 is a schematic perspective view showing an example of a configuration of a conventional pipe joint. Fig. 6 is a schematic cross-sectional view showing a cross section taken along line I-I of the pipe joint 100 of Fig. 5; The conventional pipe joint 100 shown in Figs. 5 and 6 includes a flange seal packing disposed between the end faces of the flanges 152a, 152b of the pipe bodies 151a, 151b to be connected. 154. A plurality of flange fastening portions 140 that clamp the flange sealing gasket 154 to fasten the flanges 152a, 152b.

The conventional pipe joint 100 further includes a seal ring 110 that is annularly disposed on the outer peripheral surface such that the outer peripheral surfaces of the flanges 152a and 152b of the pipe bodies 151a and 151b to be connected are bridged to each other. And a housing element 120 disposed to cover the outer peripheral surface of the seal ring 110. Each of the outer casing elements 120 has a length divided into two to four places in the circumferential direction (divided into three parts in FIG. 5), and the ends of the outer casing elements 120 are fastened by the outer casing element fastening portion 130. Further, each of the outer casing elements 120 and the seal ring 110 have a U-shaped cross section that covers the outer peripheral edge of the flanges 152a and 152b (see FIG. 6).

On the other hand, the flange fastening portion 140 includes a seal bolt 141 that is commonly screwed to the screw holes 153a, 153b provided in the flanges 152a, 152b, and a screw that is screwed to the foot of the seal screw 141. The cap nut 145 is housed. The seal screw 141 includes a cylindrical screw portion 142, a cap nut portion 143 fixed to one end side of the stud screw portion 142, and an annular seal gasket 144 provided on the flange side of the cap nut portion 143. . The annular sealing gasket 144 is a screw hole that fits over the sealing flange 152b. An annular sealing gasket 146 is also provided on the flange side of the screw receiving cap nut 145. The annular gasket 146 also employs a threaded bore that fits over the sealing flange 152b.

Here, the construction procedure of the conventional pipe joint 100 will be described. As shown in Fig. 7, in a state where the flange sealing washer 154 is held by the flanges 152a, 152b of the pipe bodies 151a, 151b to be joined, the usual hexagonal screws are inserted into the screw holes 153a, 153b of the flanges 152a, 152b. 147 is screwed together in common to complete the temporary fixing.

Next, the seal ring 110 is disposed so as to bridge the outer peripheral surfaces of the flanges 152a and 152b. Next, each of the outer casing elements 120 is disposed to cover the outer circumferential surface of the seal ring 110. At this time, in order to satisfactorily achieve the sealing performance between the seal ring 110 and the flanges 152a, 152b, the base angle position of the outer casing member 120 is adjusted in the circumferential direction, and the outer casing members are fastened by the outer casing member fastening portion 130. 120 (refer to Figure 5).

After fastening the respective outer casing members 120, the respective hexagonal screws 147 of the temporary fixing flanges 152a, 152b are sequentially replaced with the sealing screws 141 as shown in FIG. Next, the screw receiving cap nut 145 is firmly screwed to the leg portion of the sealing screw 141, and the screw holes 153a and 153b of the flanges 152a and 152b are sealed by the annular sealing washers 144 and 146.

In the conventional pipe joint 100, on the principle of the structure, there is a play between the inner faces in the axial direction of the leg portions 121a and 121b of the respective outer casing members 120 and the outer faces in the axial direction of the flanges 152a and 152b. Therefore, when the tubular joint 100 is installed, or even after the tubular joint 100 is installed, there is a possibility that the respective outer casing members 120 move minutely in the axial direction. When the outer casing elements 120 are moved in the axial direction, there is a possibility that the seal rings 110 covered by the respective outer casing elements 120 are also moved in the same manner. This point means that the possibility of leakage of fluid within the tube is increased.

Further, since the sealing screw 141 is configured to have a size corresponding to the size of the sealing gasket 144 (in the example of FIG. 6 , the sealing gasket 144 is enclosed), the shape of the head of the sealing screw 141 fitted to the wrench is temporarily fixed. The shape of the head of the hexagonal screw 147 is large. Therefore, when the hexagonal screw 147 for temporarily fixing the flanges 152a and 152b is replaced with the sealing screw 141, it is necessary to use a wrench having a different size in the work of removing the hexagonal screw 147 and the operation of mounting the sealing screw 141.

The present invention has been made in view of the above problems and has been invented in order to effectively solve the problem. An object of the present invention is to provide a pipe joint which can maintain the possibility of leakage of a fluid in a pipe and which can improve workability at the time of construction.

The present invention is a pipe joint in which flanges provided at ends of a pipe body are connected to each other, and is characterized in that: a flange sealing gasket is disposed between end faces of the flange of the pipe body; and a sealing screw is commonly screwed to a screw hole provided in both flanges; a screw receiving cap nut is screwed to the leg portion of the sealing screw; and the seal ring is annularly disposed on the outer peripheral surface so as to bridge the outer peripheral surface of the flanges of both sides; The outer casing member is disposed to cover the outer circumferential surface of the seal ring and is divided in the circumferential direction; and the outer casing member fastening portion fastens the outer casing members; and the flange side of the head of the sealing screw has a sealing function to the flange The flange side of the screw receiving cap nut has a sealing function to the flange; the shape of the head of the sealing screw is a shape that can be operated by a tool for the head of the hexagonal screw corresponding to the screw hole of the flange .

According to the present invention, when the hexagonal screw for temporary fixing is replaced with a sealing screw, the tool for the head of the hexagonal screw can be operated without changing the tool, thereby improving workability during construction.

Preferably, an annular sealing gasket corresponding to the screw hole of the flange is provided on the flange side of the head of the sealing screw, and a screw hole corresponding to the screw hole of the flange is provided on the flange side of the screw receiving cap nut Annular gasket. In this case, the sealing function between the sealing screw and the screw receiving cap nut and the flange is preferably achieved.

For example, the shape of the head of the sealing screw is two-stage, and the upper side is a shape that can be operated by a tool for the head of the hexagonal screw corresponding to the screw hole of the flange, and the lower side is a screw with the flange. The hole corresponds to the shape of the annular sealing gasket.

Alternatively, the present invention is a pipe joint in which flanges provided at ends of the pipe body are connected to each other, and is characterized by comprising: a flange sealing gasket disposed between end faces of the flange of the pipe body; a sealing screw, a common screw a screw hole provided in the flanges of both sides; a screw receiving cap nut is screwed to the leg of the sealing screw; and the seal ring is annularly formed on the outer peripheral surface by bridging the outer peripheral faces of the flanges of both sides Arranged; the annular positioning elastic body is coupled to the inner surface side of the seal ring, and is fitted into a concave portion provided on the outer peripheral side of the end surface of the flange of both the flanges; the outer casing element is disposed so as to cover the outer peripheral surface of the seal ring and It is divided in the circumferential direction; and the outer casing member fastening portion fastens the outer casing members.

According to the invention, even if the outer casing elements are moved in the axial direction, the annular positioning elastic body coupled to the inner surface side of the seal ring is fitted into the concave portion provided on the outer peripheral side of the end faces of the flanges of both the flanges, thereby suppressing the seal ring. Move in the direction of the axis. Thereby, the possibility of leakage of the fluid in the tube can be kept low.

Preferably, the flange side of the head of the sealing screw has a sealing function to the flange, and the flange side of the screw receiving cap nut has a sealing function to the flange, and the shape of the head of the sealing screw is a screw with the flange The hole corresponds to the shape that can be operated by the tool for the head of the hexagonal screw. In this case, when the hexagonal screw for temporary fixing is replaced with a sealing screw, the tool for the head of the hexagonal screw can be operated without changing the tool, thereby improving workability during construction.

Further, it is preferable that an annular sealing gasket corresponding to the screw hole of the flange is provided on the flange side of the head of the sealing screw, and a screw with the flange is provided on the flange side of the screw receiving cap nut. A ring-shaped sealing gasket corresponding to the hole. In this case, the sealing function between the sealing screw and the screw receiving cap nut and the flange can be preferably achieved.

For example, the shape of the head of the sealing screw is two-stage, and the upper side of the head of the sealing screw is a shape that can be operated by a tool for the head of the hexagonal screw corresponding to the screw hole of the flange, and the sealing screw The lower side of the head is in the shape of a ring-shaped sealing gasket corresponding to the flange as a screw hole.

Alternatively, the present invention is a sealing screw having a shape in which the head portion has a two-stage shape, and the upper side is a shape that can be operated by a tool for a general hexagonal screw corresponding to a screw portion of a screw; It is a shape larger than the upper side.

According to the present invention, when the hexagonal screw for temporary fixing is replaced with a sealing screw, the tool for the head of the hexagonal screw can be used. Therefore, it is not necessary to change the tool, so workability during construction is improved. Further, since the lower side of the seal screw is larger than the upper side, it is easy to abut the seal gasket or enclose it on the lower side of the seal screw.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 is a schematic perspective view of a pipe joint according to a first embodiment of the present invention. Fig. 2 is a schematic cross-sectional view showing a cross section taken along line I-I of the pipe joint of Fig. 1; As shown in FIG. 1 and FIG. 2, the pipe joint 1 of the present embodiment includes an annular flange sealing gasket 54 disposed between end faces of the flanges 52a and 52b of the pipe bodies 51a and 51b to be connected; The flange fastening portions 40 are fastened to the flanges 52a, 52b with the flange sealing washers 54 interposed therebetween.

The pipe joint 1 further includes a seal ring 10 which is annularly disposed on the outer peripheral surface so as to bridge the outer peripheral surfaces of the flanges 52a and 52b, and a casing member 20 to cover the outer peripheral surface of the seal ring 10 Mode configuration.

An annular recess 11 is formed in the center of the inner surface side of the seal ring 10. An annular positioning elastic body 12 is fitted to the recessed portion 11. The annular positioning elastic body 12 includes a convex portion 13 that is fitted and fixed by the concave portion 11 of the seal ring 10, and an insertion portion 14 that is fitted into the concave portion 55 on the outer peripheral side of the end faces of the flanges 52a and 52b. The fitting portion 14 of the present embodiment has a rectangular cross section.

Each of the outer casing elements 20 has a length divided into two to four places in the circumferential direction (divided into three parts in FIG. 1), and the end portions of the outer casing elements 20 are fastened by the outer casing element fastening portion 30. Further, each of the outer casing elements 20 has a U-shaped cross section that covers the seal ring 10, but does not cover the outer peripheral edge of the flanges 52a and 52b (see Fig. 2).

On the other hand, the flange fastening portion 40 includes a seal screw 41 that is screwed in common to the screw holes 53a and 53b provided in the flanges 52a and 52b, and a screw accommodation cover nut 45 that is screwed to the seal screw 41. The feet. The sealing screw 41 includes a cylindrical screw portion 42, a cap nut portion 43 fixed to one end side of the cylindrical screw portion 42, and an annular sealing washer 44 and a convex portion provided to the cap nut portion 43. The screw hole 53b of the flange 52b on the rim side corresponds to and has a sealing property. The sealing gasket 44 ensures a sealing function to the flange 52b of the head of the sealing screw 41. Similarly, an annular sealing gasket 46 having a sealing property corresponding to the screw hole 53a of the flange 52a is also provided on the flange side of the screw receiving cap nut 45. The sealing gasket 46 ensures a sealing function to the flange 52a of the screw receiving cap nut 45.

Further, as shown in FIG. 2, the shape of the head portion (the cap nut portion 43) of the seal screw 41 is a two-stage shape in which the lower portion 411 has a larger diameter than the upper portion 412. The upper portion 412 has the same shape as that of the head of the hexagonal screw corresponding to the screw hole 53b of the flange 52b (determined according to standards such as Japanese Industrial Standards (JIS)). That is, the upper portion 412 has a shape that can be operated by a tool for the head of the hexagonal screw corresponding to the screw hole 53b of the flange 52b. On the other hand, the lower portion 411 has a shape that fits the annular seal gasket 44 corresponding to the screw hole 53b of the flange 52b. More specifically, the lower portion 411 is in the shape of an inner sealing gasket 44.

On the other hand, the shape of the screw accommodation cap nut 45 is also the same as that of the cap nut portion 43.

Next, the construction procedure of the present embodiment including the configuration described above will be described with reference to Figs. 1 to 3 .

First, as shown in Fig. 3, in the state in which the flanges 52a, 52b of the tubular bodies 51a, 51b to be connected are sandwiched by the flange sealing washer 54, the screw holes 53a, 53b of the flanges 52a, 52b are inserted and the common screw is inserted. The usual hexagonal screw 47 is incorporated, thereby completing the temporary fixing.

Next, the seal ring 10 is disposed so as to bridge the outer peripheral surfaces of the flanges 52a and 52b. At this time, the fitting portion 14 of the annular positioning elastic body 12 is fitted into the concave portion 55 provided on the outer peripheral side of the end faces of the both flanges 52a and 52b. Thereafter, each of the outer casing elements 20 is disposed to cover the outer circumferential surface of the seal ring 10 . At this time, in order to satisfactorily achieve the sealing performance between the seal ring 10 and the flanges 52a, 52b, the base angle positions of the respective outer casing members 20 are adjusted in the circumferential direction, and the outer casing members are fastened by the outer casing member fastening portions 30. 20 (refer to Figure 1).

After fastening the outer casing members 20, the hexagonal screws 47 of the temporary fixing flanges 52a, 52b are sequentially replaced with the sealing screws 41 as shown in FIG. At this time, since the shape of the head of the hexagonal screw 47 is the same as the shape of the head of the sealing screw 41, the work can be continued by the tool for the head of the hexagonal screw 47. Further, the screw receiving cap nut 45 is firmly fixed to the leg portion of the sealing screw 41, and the screw holes 53a and 53b of the flanges 52a and 52b are sealed by the annular sealing washers 44 and 46.

According to the present embodiment as described above, when the hexagonal screw 47 for temporary fixing is replaced with the sealing screw 41, the tool for the head of the hexagonal screw 47 can be operated without changing the tool, thereby improving the construction time. Workability.

Further, according to the present embodiment, even if the outer casing elements 20 are moved in the axial direction, the annular positioning elastic body 12 coupled to the inner surface side of the seal ring 10 is fitted to the outer periphery of the end faces of the flanges 52a and 52b provided on both sides. The recess 55 on the side can also suppress the movement of the seal ring 10 in the axial direction. Thereby, the possibility of leakage of the fluid in the tube can be kept low.

Further, by providing the sealing washers 44, 46, the sealing function between the sealing screw 41 and the screw receiving cap nut 45 and the flanges 52a, 52b is preferably achieved.

Next, a second embodiment of the present invention will be described with reference to Fig. 4 .

Fig. 4 is a schematic cross-sectional view showing an essential part of a pipe joint according to a second embodiment of the present invention. In the pipe joint 1' shown in FIG. 4, the outer casing member 20' includes a casing portion 21 disposed to cover the outer peripheral surface of the seal ring 10, and a sandwich portion 22 to cover the outer peripheral surface of the outer casing portion 21 Mode configuration. Further, the fitting portion 14' of the annular positioning elastic body 12' has a pentagonal cross section. More specifically, the fitting portion 14' has a tapered portion whose width gradually increases toward the fitting direction.

The other configuration is substantially the same as that of the first embodiment. In FIG. 4, the same portions as those in the first embodiment shown in FIGS. 1 to 3 are denoted by the same reference numerals, and detailed description thereof will be omitted.

The construction procedure of the present embodiment including such a configuration is substantially the same as the construction procedure of the first embodiment. Therefore, the detailed description thereof will be omitted.

According to the present embodiment, when the hexagonal screw 47 for temporary fixing is replaced with the sealing screw 41, the tool for the head of the hexagonal screw 47 can be operated without changing the tool, thereby improving the workability during construction. .

Further, according to the present embodiment, the fitting portion 14' of the annular positioning elastic body 12' has a tapered portion, whereby the degree of bonding to the concave portion 55 is high.

As described above, the shape or material of the annular positioning elastic bodies 12 and 12' joined to the concave portion 11 of the seal ring 10 can be appropriately selected or replaced in accordance with the shape or material of the concave portion 55.

1, 1', 100. . . Pipe joint

10, 110. . . Sealing ring

11. . . Concave

12, 12'. . . Annular positioning elastomer

13. . . Convex

14, 14'. . . Embedding department

20, 20', 120. . . Housing component

twenty one. . . Outer shell

twenty two. . . Mezzanine

30, 130. . . Housing component fastening

40, 140. . . Flange fastening

41, 141. . . Sealing screw

411. . . Lower part

412. . . Upper

42,142. . . Cylindrical screw

43,143. . . Cap nut

44, 144. . . Gasket

45, 145. . . Screw storage cap nut

46, 146. . . Gasket

47, 147. . . Hexagonal screw

51a, 51b, 151a, 151b. . . Tube body

52a, 52b, 152a, 152b. . . Flange

53a, 53b, 153a, 153b. . . Screw hole

54,154. . . Flange gasket

55. . . Concave

121a, 121b. . . Foot

Fig. 1 is a schematic perspective view of a pipe joint according to a first embodiment of the present invention.

Fig. 2 is a schematic cross-sectional view showing a cross section taken along line I-I of the pipe joint of Fig. 1;

Fig. 3 is a schematic view for explaining a construction procedure of the pipe joint of Fig. 1;

Fig. 4 is a schematic cross-sectional view showing an essential part of a pipe joint according to a second embodiment of the present invention.

Fig. 5 is a schematic perspective view showing an example of a configuration of a conventional pipe joint.

Fig. 6 is a schematic cross-sectional view showing a cross section taken along line I-I of the pipe joint of Fig. 5;

Figure 7 is a schematic view for explaining the construction sequence of the pipe joint of Figure 5;

1. . . Pipe joint

10. . . Sealing ring

12. . . Annular positioning elastomer

20. . . Housing component

30. . . Housing component fastening

411. . . Lower part

412. . . Upper

51a, 51b. . . Tube body

52a, 52b. . . Flange

55. . . Concave

Claims (3)

A pipe joint connecting the flanges disposed at the ends of the pipe body to each other, comprising: a flange sealing gasket disposed between the end faces of the flanges of the pipe body; the cylindrical screws being commonly screwed to a screw hole provided in the flange of the both sides; a screw receiving cap nut screwed to the leg portion of the cylindrical screw; and a seal ring on the outer peripheral surface of the flange to bridge the outer peripheral surface of the flange An annular arrangement; the outer casing element is disposed to cover the outer circumferential surface of the seal ring and is divided in the circumferential direction; and the outer casing element fastening portion fastens each of the outer casing elements; and the screw receives the convexity of the cap nut The rim side has a sealing function for the flange; the shape of the head of the screw accommodating cap nut is a shape that can be operated by a tool for a head of a hexagonal screw corresponding to the screw hole of the flange An annular sealing gasket corresponding to the screw hole of the flange is disposed on a flange side of the screw receiving cap nut, and the head of the screw receiving cap nut has a shape of two segments; The shape of the upper side of the two segments is such that the screw holes are available for the flange Be hexagonal head of the screw and a work tool shape, the shape of the lower side shaped to fit Sec corresponding to the screw hole in the shape of an annular flange sealing gaskets. A pipe joint connecting the flanges provided at the ends of the pipe body to each other The joint is characterized in that: a flange sealing gasket is disposed between the end faces of the flange of the pipe body; the cylindrical screws are screwed into the screw holes of the flanges disposed on both sides; the screw receiving cover nut And screwed to the leg portion of the cylindrical screw; the seal ring is annularly disposed on the outer peripheral surface so as to bridge the outer peripheral surface of the flange; the annular positioning elastic body and the inner surface of the seal ring a side portion that is coupled to the outer peripheral edge side of the end surface of the flange provided on both sides; the outer casing member is disposed to cover the outer circumferential surface of the seal ring and is divided in the circumferential direction; and the outer casing member fastening portion Securing each of the outer casing members; the flange side of the screw receiving cap nut has a sealing function for the flange; the head of the screw receiving cap nut is shaped to utilize the screw with the flange a shape of a working tool for a head of a hexagonal screw corresponding to a hole; and an annular sealing gasket corresponding to the screw hole of the flange on a flange side of the screw receiving cap nut; the screw receiving The shape of the head of the cap nut is two-stage; The upper side of the head of the cylindrical screw is a shape that can be operated by a tool for the head of the hexagonal screw corresponding to the screw hole of the flange, and the lower side of the head of the sealing screw is fitted The shape of the annular sealing gasket corresponding to the screw hole of the flange. A screw accommodating cap nut having a shape of a head portion, wherein the flange side of the screw accommodating cap nut has a sealing function for a flange of an end portion of the pipe body; An annular sealing gasket corresponding to the screw hole of the flange is provided on the flange side of the storage cap nut; the upper portion of the two segments is a general hexagonal screw that can be used corresponding to the screw portion of the screw The shape of the tool to work is such that the lower side of the two-stage shape has a shape larger than the upper side and is fitted to the shape of an annular sealing gasket corresponding to the screw hole of the flange.