JP2023151266A - flange - Google Patents

Abstract

To provide a flange capable of suppressing damage due to stress concentration.SOLUTION: A flange that is one aspect of the present invention is an annular flange having corners and sides, the flange comprising a first flange member having a corner forming part forming the corner, and a second flange member having a side forming part forming the side part and joined to the first flange member. The corner forming part comprises: an arcuate surface having a predetermined radius of curvature, and forming an inner peripheral surface of the corner; and an extension part extending in a direction away from an end part of the arcuate surface, and joined to the side forming part. A joint part between the extension part and the side forming part is separated from an end part of the arcuate surface by a distance or more set based on the radius of curvature and a width of the side forming part.SELECTED DRAWING: Figure 1

Description

The present invention relates to a flange.

In a marine diesel engine mounted on a ship, various pipes through which fluid such as combustion gas flows are provided with flanges for joining with devices such as coolers or other pipes that handle the fluid. Generally, the flange is formed in an annular shape surrounding the fluid flow path and is provided at the peripheral end of the tube. The flange is joined to another flange provided at the open end of the target device or at the peripheral end of the tube by a fastening member such as a bolt. This joins these devices and tubes, or the tubes together.

As an example of the above-mentioned flange, there is conventionally a flange formed by joining a plurality of plate-like members in an annular shape. For example, as shown in FIG. 8A, a conventional flange 201 consists of four plate-like members 202 to 205, and joins each end face of the plate-like members 202 and 204 to each end side surface of the plate-like members 203 and 205. By doing so, it is formed into a rectangular ring shape. Further, as shown in FIG. 8B, the conventional flange 211 is made up of four plate-like members 212 to 215, and each end face of the plate-like members 212 and 214 and each end face of the plate-like members 213 and 215 are joined. It is formed into a rectangular ring shape. The plate-like members of these conventional flanges 201 and 211 are joined together by, for example, welding (see Patent Document 1).

Japanese Patent Application Publication No. 9-323170

Generally, in a flange of a pipe, the pressure of the fluid flowing inside the pipe is applied from the inner circumferential surface side of the flange, thereby causing stress concentration at the corners of the flange (particularly at the corners of the inner circumferential surface). As exemplified by the conventional flanges 201 and 211 described above, in a flange formed by joining a plurality of plate-like members, the stress concentration part of the flange is located at the joint between the plate-like members (for example, FIG. 8A , 8B). Therefore, the joint between the plate-shaped members may be affected by stress concentration, which may cause damage to the flange. Such problems with flanges occur particularly in, for example, flanges of pipes through which high-pressure fluid such as combustion gas of marine diesel engines flows.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a flange that can suppress damage caused by stress concentration.

In order to solve the above problems and achieve the objects, the flange according to the present invention is an annular flange having a corner and a side, and a first flange member having a corner forming part forming the corner. and a second flange member having a side forming part forming the side part and being joined to the first flange member, the corner forming part having a predetermined radius of curvature, and the corner forming part having a predetermined radius of curvature. an arcuate surface forming an inner circumferential surface of the arcuate surface, and an extension portion extending in a direction away from an end of the arcuate surface and joined to the edge formation portion, the extension portion and the edge formation portion being joined to the edge formation portion. The joint portion with the portion is spaced apart from the end portion of the arcuate surface by a distance set based on the radius of curvature and the width of the side forming portion.

Moreover, the flange according to the present invention is characterized in that, in the above invention, the separation distance decreases as the radius of curvature increases, and increases as the radius of curvature decreases.

Further, in the above invention, the flange according to the present invention further includes an insertion hole through which the fastening member is inserted, and the joint between the extension part and the side forming part is located so as to be removed from the insertion hole. It is characterized by

Moreover, the flange according to the present invention is characterized in that, in the above invention, each of the first flange member and the second flange member is plural.

Moreover, the flange according to the present invention is characterized in that, in the above invention, the first flange member further includes the side forming part formed integrally with the corner forming part.

Further, the flange according to the present invention is characterized in that, in the above invention, the flange is provided at a peripheral end of a pipe through which combustion gas of a marine diesel engine flows.

According to the present invention, it is possible to suppress damage to the flange due to stress concentration.

FIG. 1 is a schematic diagram showing one configuration example of a flange according to an embodiment of the present invention. FIG. 2 is a schematic diagram showing an example of a plurality of plate-like members forming a flange according to an embodiment of the present invention. FIG. 3 is a diagram for explaining the joining positions of a plurality of plate members forming a flange according to an embodiment of the present invention. FIG. 4 is a diagram for explaining a method of cutting out a plurality of flange members that constitute a flange according to an embodiment of the present invention. FIG. 5 is a diagram for explaining a method of cutting out an integral flange from a material plate. FIG. 6 is a schematic diagram showing an example of application of the flange according to the embodiment of the present invention. FIG. 7 is a schematic diagram showing a modified example of the flange according to the embodiment of the present invention. FIG. 8A is a schematic diagram showing a first example of a conventional flange. FIG. 8B is a schematic diagram showing a second example of a conventional flange.

Hereinafter, preferred embodiments of the flange according to the present invention will be described in detail with reference to the accompanying drawings. Note that the present invention is not limited to this embodiment. Furthermore, it should be noted that the drawings are schematic, and the dimensional relationship of each element, the ratio of each element, etc. may differ from the actual one. Drawings may also include portions that differ in dimensional relationships and ratios. Further, in each drawing, the same components are given the same reference numerals.

(Flange configuration)
First, the structure of the flange according to the embodiment of the present invention will be explained. FIG. 1 is a schematic diagram showing one configuration example of a flange according to an embodiment of the present invention. FIG. 2 is a schematic diagram showing an example of a plurality of plate-like members forming a flange according to an embodiment of the present invention. FIG. 2 shows a state in which the flange shown in FIG. 1 is divided into plate-like members. The flange 1 according to the embodiment of the present invention is an annular flange having corners and sides, and as shown in FIG. ). Note that the central axis C is the central axis of a pipe (not shown) on which the flange 1 is provided. The flow path 105 formed by the tube is enclosed inside the flange 1, as shown in FIG. Such a flange 1 includes a plurality of plate-like members, for example, as shown in FIGS. 1 and 2, two first flange members 2 and 3 and two second flange members 4 and 5.

Each of the first flange members 2 and 3 is an example of a plate-like member having a corner forming part that forms a corner of the flange 1. In this embodiment, each of the first flange members 2 and 3 has, for example, a pair of corners of the flange 1 and a side between the pair of corners integrally formed. Among such first flange members 2 and 3, as shown in FIGS. 1 and 2, the first flange member 2 has a pair of corner forming parts 21 and 22 and a side forming part 23, and the first flange member 3 has a pair of corner forming parts 31 and 32 and a side forming part 33.

The pair of corner forming parts 21 and 22 are plate-like members that form a pair of corners in the flange 1. As shown in FIG. 1, the corner forming portion 21 forms, for example, one corner (the upper left corner in FIG. 1) among the four corners of the rectangular annular flange 1. Specifically, as shown in FIGS. 1 and 2, the corner forming section 21 includes a corner forming section main body 24, an extending section 25, and an arcuate surface 26.

The corner forming part main body 24 is a part of the corner forming part 21 that has the same structure as one corner of the flange 1. For example, as shown in FIG. 1, the corner forming part main body 24 has an outer circumferential surface including a corner (projected corner) and an arcuate inner circumferential surface (an arcuate surface 26 described later), similar to the upper left corner of the flange 1. and has. As shown in FIGS. 1 and 2, one end 24a of both ends 24a and 24b of the corner forming part main body 24 is connected to one arcuate end of the inner circumferential surface (the arcuate end 26a of the arcuate surface 26). ), and the other end 24b is located at the other arcuate end of the inner peripheral surface (the arcuate end 26b of the arcuate surface 26).

The extending portion 25 is a portion of the corner forming portion 21 that extends from the corner forming portion main body 24 described above. Specifically, as shown in FIGS. 1 and 2, the extending portion 25 extends from one end 24a of the corner forming portion main body 24 toward the side forming portion 41 of the second flange member 4. It is formed seamlessly and integrally with the corner forming part main body 24. Here, the arcuate inner circumferential surface of the corner forming portion main body 24 is an arcuate surface 26, which will be described later. The extending portion 25 extends in a direction away from the end of the arc surface 26 (the arc end 26a shown in FIGS. 1 and 2). For example, the direction is a tangential direction at the arcuate end portion 26a, that is, a direction perpendicular to the end portion 24a of the corner forming portion main body 24. The end portion of the extending portion 25 (extending end portion 25a shown in FIG. 2) is joined to the side forming portion 41 of the second flange member 4, as shown in FIG. The extending portion 25 forms a side portion of the flange 1 together with the side forming portion 41 .

The arcuate surface 26 forms an arcuate inner peripheral surface at the corner of the flange 1 in the corner forming portion 21 . Specifically, as shown in FIGS. 1 and 2, the arcuate surface 26 is an arcuate surface having a predetermined radius of curvature R, and corresponds to the inner circumferential surface of the corner forming portion main body 24. The arcuate surface 26 forms the inner peripheral surface of the upper left corner corresponding to the corner forming part main body 24 among the four corners of the flange 1 . Further, as shown in FIGS. 1 and 2, among both ends (arc ends 26a, 26b) of the arcuate surface 26, one arcuate end 26a is the arcuate end on the above-mentioned extending portion 25 side, It is located at the boundary between the corner forming portion main body 24 and the extension portion 25 (ie, the end portion 24a). The other arcuate end portion 26b is the arcuate end portion on the side forming portion 23 side, and is located at the boundary between the corner forming portion main body 24 and the side forming portion 23 (that is, the end portion 24b).

Further, as shown in FIG. 1, the corner forming portion 22 forms one corner (the lower left corner in FIG. 1) among the four corners that the flange 1 has. Specifically, as shown in FIGS. 1 and 2, the corner forming part 22 has a corner forming part main body 27, an extending part 28, and an arcuate surface 29. In addition, in this embodiment, the corner forming part 22 forms a pair with the corner forming part 21 mentioned above. As shown in FIGS. 1 and 2, such a corner forming portion 22 is formed symmetrically with the corner forming portion 21 with the side forming portion 23 of the first flange member 2 interposed therebetween.

That is, as shown in FIGS. 1 and 2, the corner forming part main body 27 is formed symmetrically with the above-described corner forming part main body 24 with the side forming part 23 in between. Such a corner forming part main body 27 has, for example, an outer circumferential surface and an inner circumferential surface (an arcuate surface 29 described below) similar to the lower left corner of the flange 1. Further, among both ends 27a and 27b of the corner forming portion main body 27, one end 27a is located at one arcuate end of the inner circumferential surface (the arcuate end 29a of the arcuate surface 29), and the other end 27b is located at the other arcuate end of the inner circumferential surface (the arcuate end 29b of the arcuate surface 29).

Further, as shown in FIGS. 1 and 2, the extending portion 28 is formed symmetrically with the extending portion 25 from the corner forming portion main body 24 mentioned above, with the side forming portion 23 in between. That is, the extending portion 28 is seamlessly formed integrally with the corner forming portion main body 27 so as to extend from one end 27a of the corner forming portion main body 27 toward the side forming portion 51 of the second flange member 5. be done. Specifically, as shown in FIGS. 1 and 2, the extending portion 28 extends in the direction away from the end (arc end 29a) of the arcuate surface 29, which is the arcuate inner peripheral surface of the corner forming portion main body 27. Extending. For example, the direction is a tangential direction at the arcuate end portion 29a, that is, a direction perpendicular to the end portion 27a of the corner forming portion main body 27. The end portion of the extending portion 28 (extending end portion 28a shown in FIG. 2) is joined to the side forming portion 51 of the second flange member 5, as shown in FIG. The extending portion 28 forms a side portion of the flange 1 together with the side forming portion 51 .

Further, as shown in FIGS. 1 and 2, the arc surface 29 is formed symmetrically with the arc surface 26 of the corner formation section 21 described above, with the side formation section 23 in between. That is, the arcuate surface 29 is an arcuate surface with a radius of curvature R that corresponds to the inner circumferential surface of the corner forming portion main body 27. The arcuate surface 29 forms the inner peripheral surface of the lower left corner corresponding to the corner forming part main body 27 among the four corners of the flange 1 . Further, as shown in FIGS. 1 and 2, among both ends (arc ends 29a, 29b) of the arcuate surface 29, one arcuate end 29a is the arcuate end on the extending portion 28 side, and a corner is formed. It is located at the boundary between the section main body 27 and the extension section 28 (ie, the end section 27a). The other arcuate end portion 29b is the arcuate end portion on the side forming portion 23 side, and is located at the boundary between the corner forming portion main body 27 and the side forming portion 23 (that is, the end portion 27b).

The side forming portion 23 forms one side among a plurality of sides (four in FIG. 1) that the flange 1 has. Specifically, as shown in FIGS. 1 and 2, the side forming portion 23 is seamlessly formed integrally with the corner forming portions 21 and 22 so as to be interposed between the corner forming portions 21 and 22. That is, one end of the side forming part 23 matches the end 24b of one corner forming part main body 24, and the other end of the side forming part 23 matches the end 27b of the other corner forming part main body 27. Such side forming part 23 is a pair of corners (upper left corner and lower left corner in FIG. 1) each formed by the above-mentioned corner forming parts 21 and 22 among the four sides of flange 1. A side portion is formed between the edges.

In addition, as shown in FIGS. 1 and 2, the first flange member 3 has a different orientation from the first flange member 2 described above when forming the flange 1 (for example, the orientation is reversed by 180 degrees around the central axis C). It has the same structure as the above-mentioned first flange member 2 except that.

Specifically, as shown in FIGS. 1 and 2, the first flange member 3 has a pair of corner forming portions 31 and 32 and a side forming portion 33. The pair of corner forming portions 31 and 32 have a structure in which the pair of corner forming portions 21 and 22 in the first flange member 2 described above are each reversed by 180 degrees around the central axis C. That is, the corner forming part 31 forms a corner of the flange 1 at a position symmetrical to the corner forming part 21 (the upper right corner in FIG. 1). The corner forming part 32 forms a corner of the flange 1 at a position symmetrical to the corner forming part 22 (the lower right corner in FIG. 1).

Of the pair of corner forming parts 31 and 32, the corner forming part 31 has a corner forming part main body 34, an extending part 35, and an arcuate surface 36, as shown in FIGS. The corner forming portion main body 34 is a portion of the corner forming portion 31 that has the same structure as one corner of the flange 1. For example, as shown in FIG. 1, the corner forming part main body 34 has an outer circumferential surface and an inner circumferential surface (an arcuate surface 36 described later) similar to the upper right corner of the flange 1. Further, as shown in FIGS. 1 and 2, among both ends 34a and 34b of the corner forming part main body 34, one end 34a is connected to one arcuate end of the inner peripheral surface (the arcuate end 36a of the arcuate surface 36). ), and the other end 34b is located at the other arcuate end of the inner peripheral surface (the arcuate end 36b of the arcuate surface 36).

The extending portion 35 is a portion of the corner forming portion 31 that extends from the corner forming portion main body 34 described above. Specifically, as shown in FIGS. 1 and 2, the extending portion 35 extends from one end 34a of the corner forming portion main body 34 toward the side forming portion 41 of the second flange member 4. It is seamlessly formed integrally with the corner forming part body 34. That is, the extending portion 35 extends in a direction away from the end of the arcuate surface 36 (the arcuate end 36a shown in FIGS. 1 and 2), which is the arcuate inner peripheral surface of the corner forming portion main body 34. . For example, the direction is a tangential direction at the arcuate end portion 36a, that is, a direction perpendicular to the end portion 34a of the corner forming portion main body 34. The end portion of the extending portion 35 (extending end portion 35a shown in FIG. 2) is joined to the side forming portion 41 of the second flange member 4, as shown in FIG. The extending portion 35 forms a side portion of the flange 1 together with the side forming portion 41 .

The arcuate surface 36 forms an arcuate inner peripheral surface at the corner of the flange 1 in the corner forming portion 31 . Specifically, as shown in FIGS. 1 and 2, the arcuate surface 36 is an arcuate surface with a radius of curvature R, similar to the arcuate surface 29 of the first flange member 2 described above, and the inner circumferential surface of the corner forming portion main body 34. Applies to. The arcuate surface 36 forms the inner peripheral surface of the upper right corner corresponding to the corner forming part main body 34 among the four corners of the flange 1 . Further, as shown in FIGS. 1 and 2, among both ends (arc ends 36a, 36b) of the arcuate surface 36, one arcuate end 36a is the arcuate end on the above-mentioned extending portion 35 side, It is located at the boundary between the corner forming portion main body 34 and the extension portion 35 (ie, the end portion 34a). The other arcuate end portion 36b is an arcuate end portion on the side forming portion 33 side, and is located at the boundary between the corner forming portion main body 34 and the side forming portion 33 (that is, the end portion 34b).

Moreover, the corner forming part 32 has a corner forming part main body 37, an extending part 38, and a circular arc surface 39, as shown in FIGS. 1 and 2. In addition, in this embodiment, the corner forming part 32 forms a pair with the corner forming part 31 mentioned above. As shown in FIGS. 1 and 2, such a corner forming portion 32 is formed symmetrically with the corner forming portion 31 with the side forming portion 33 of the first flange member 3 interposed therebetween.

That is, as shown in FIGS. 1 and 2, the corner forming part main body 37 is formed symmetrically with the above-described corner forming part main body 34 with the side forming part 33 in between. Such a corner forming portion main body 37 has, for example, an outer circumferential surface and an inner circumferential surface (a circular arc surface 39 described below) similar to the lower right corner of the flange 1. Further, among both ends 37a and 37b of the corner forming portion main body 37, one end 37a is located at one arcuate end of the inner circumferential surface (the arcuate end 39a of the arcuate surface 39), and the other end 37b is located at the other arcuate end of the inner peripheral surface (the arcuate end 39b of the arcuate surface 39).

Further, as shown in FIGS. 1 and 2, the extending portion 38 is formed symmetrically with the extending portion 35 from the corner forming portion body 34 described above, with the side forming portion 33 in between. That is, the extending portion 38 is seamlessly formed integrally with the corner forming portion main body 37 so as to extend from one end 37a of the corner forming portion main body 37 toward the side forming portion 51 of the second flange member 5. be done. Specifically, as shown in FIGS. 1 and 2, the extending portion 38 extends in the direction away from the end (arc end 39a) of the arcuate surface 39, which is the arcuate inner peripheral surface of the corner forming portion main body 37. Extending. For example, the direction is a tangential direction at the arcuate end portion 39a, that is, a direction perpendicular to the end portion 37a of the corner forming portion main body 37. The end portion of the extending portion 38 (extending end portion 38a shown in FIG. 2) is joined to the side forming portion 51 of the second flange member 5, as shown in FIG. The extending portion 38 forms a side portion of the flange 1 together with the side forming portion 51 .

Further, as shown in FIGS. 1 and 2, the arc surface 39 is formed symmetrically with the arc surface 36 of the corner formation section 31 described above, with the side formation section 33 in between. That is, the arcuate surface 39 is an arcuate surface with a radius of curvature R that corresponds to the inner circumferential surface of the corner forming portion main body 37. The arcuate surface 39 forms the inner peripheral surface of the lower right corner corresponding to the corner forming part main body 37 among the four corners of the flange 1 . Further, as shown in FIGS. 1 and 2, among both ends (arc ends 39a, 39b) of the arc surface 39, one arc end 39a is the arc end on the extending portion 38 side, and a corner is formed. It is located at the boundary between the section main body 37 and the extension section 38 (that is, the end section 37a). The other arcuate end portion 39b is an arcuate end portion on the side forming portion 33 side, and is located at the boundary between the corner forming portion main body 37 and the side forming portion 33 (that is, the end portion 37b).

The side forming portion 33 forms, for example, one of the four side portions of the flange 1 at a position symmetrical to the side forming portion 23 of the first flange member 2 described above. Specifically, as shown in FIGS. 1 and 2, the side forming portion 33 is seamlessly formed integrally with the corner forming portions 31 and 32 so as to be interposed between the corner forming portions 31 and 32. That is, one end of the side forming part 33 matches the end 34b of one corner forming part main body 34, and the other end of the side forming part 33 matches the end 37b of the other corner forming part main body 37. Such side forming portions 33 are formed by forming a pair of corners (an upper right corner and a lower right corner in FIG. ).

Further, the second flange members 4 and 5 are examples of plate-like members having side forming portions that form the sides of the flange 1. In this embodiment, the second flange members 4 and 5 have, for example, the same linear structure. Specifically, as shown in FIGS. 1 and 2, the second flange members 4 and 5 have side forming portions 41 and 51, respectively.

The side forming portion 41 of the second flange member 4 forms one side among the plurality of sides that the flange 1 has. Specifically, as shown in FIGS. 1 and 2, the side forming part 41 is joined to the corner forming part 21 of the first flange member 2 and the corner forming part 31 of the first flange member 3 from both sides in the longitudinal direction. be done. At this time, among both ends of the side forming part 41 in the longitudinal direction (side ends 41a and 41b shown in FIG. 2), one side end 41a is joined to the extending part 25 of the corner forming part 21, and the other side end 41a is joined to the extending part 25 of the corner forming part 21. The side end portion 41b is joined to the extension portion 35 of the corner forming portion 31. That is, the joint 11 between the first flange member 2 and the second flange member 4 is a joint between the extending end 25a and the side end 41a. The joint 12 between the first flange member 3 and the second flange member 4 is a joint between the extending end 35a and the side end 41b. Among the four sides of the flange 1, such a side forming part 41 is a side interposed between a pair of corners formed by the corner forming parts 21 and 31 described above (the upper side in FIG. part).

The side forming part 51 of the second flange member 5 forms, for example, one of the four sides of the flange 1 that is located symmetrically to the side forming part 41 of the second flange member 4 described above. be. Specifically, as shown in FIGS. 1 and 2, the side forming part 51 is joined to the corner forming part 22 of the first flange member 2 and the corner forming part 32 of the first flange member 3 from both sides in the longitudinal direction. be done. At this time, among both ends in the longitudinal direction of the side forming part 51 (side ends 51a and 51b shown in FIG. 2), one side end 51a is joined to the extending part 28 of the corner forming part 22, and the other side end 51a is joined to the extending part 28 of the corner forming part 22. The side end portion 51b is joined to the extending portion 38 of the corner forming portion 32. That is, the joint 13 between the first flange member 2 and the second flange member 5 is a joint between the extending end 28a and the side end 51a. The joint 14 between the first flange member 3 and the second flange member 5 is a joint between the extending end 38a and the side end 51b. Such a side forming part 51 is a side (lower side in FIG. form the edges).

Further, the flange 1 is provided with a coupling hole 6, as shown in FIGS. 1 and 2. The joining hole 6 is an example of an insertion hole (through hole) through which a fastening member such as a bolt for joining the pipes provided with the flange 1 is inserted. For example, as shown in FIGS. 1 and 2, a plurality of coupling holes 6 are provided in the first flange members 2 and 3 and the second flange members 4 and 5 that form the flange 1. As shown in FIG. 1, these plurality of joint holes 6 are located at positions that do not overlap with any of the joints 11, 12, 13, and 14 between the first flange members 2, 3 and the second flange members 4, 5 described above. provided. Note that the number of coupling holes 6 is not limited to those shown in FIGS. 1 and 2, and may be any number necessary for joining the pipes (fastening the flange 1). Further, the inner circumferential surface of the coupling hole 6 may or may not be provided with a thread.

In addition, as a material of the 1st flange members 2, 3 and the 2nd flange members 4, 5 mentioned above, metals, such as iron, or an alloy are mentioned, for example. Further, as a method for joining the first flange members 2, 3 and the second flange members 4, 5, for example, welding or the like may be used.

(Joining position)
Next, the joining positions of the first flange members 2 and 3 and the second flange members 4 and 5 that form the flange 1 will be explained. FIG. 3 is a diagram for explaining the joining positions of a plurality of plate members forming a flange according to an embodiment of the present invention. The joint parts 11, 12, 13, 14 (see FIG. 1) between the first flange members 2, 3 and the second flange members 4, 5 (see FIG. (a) at least a predetermined distance away from the

For example, as shown in FIG. 3, at one corner of the flange 1, the joint 12 between the extension part 35 of the first flange member 3 and the side forming part 41 of the second flange member 4 is separated by a distance Y or more, It is spaced apart from the arcuate surface 36 of the forming portion 31 (the inner circumferential surface of the corner forming portion main body 34). The separation distance Y is the lower limit of the separation distance from the arc surface 36 of the corner forming part 31 to the joint part 12 between the extension part 35 and the side forming part 41, and as shown in FIG. It is defined as the distance from the position P2 of the side arcuate end 36a to the position P3 of the joint 12. Such a separation distance Y is calculated using the following formula (1) using the distance X between the positions P1 and P2 in the separation direction between the arcuate end portion 36a and the joint portion 12, and the plate width W of the side portion of the flange 1. Represented by
Y=aX+W...(1)

In equation (1), the coefficient a is, for example, a negative constant greater than or equal to −1 and less than or equal to −0.5. In particular, the coefficient a is preferably −0.8. The plate width W is, for example, the plate width of the side forming portion 33 as shown in FIG. Further, as shown in FIG. 3, position P1 is the position of the arc end 36b on the side forming part 33 side, and position P2 is the position of the arc end 36a on the extension part 35 side. The distance X between such positions P1 and P2 is equal to the radius of curvature R of the circular arc surface 36. Therefore, the separation distance Y is set based on the radius of curvature R of the arcuate surface 36 and the plate width W of the side forming portion 33.

Here, stress concentration occurs at the corners of the flange 1 due to the influence of the pressure of the fluid (for example, high-pressure fluid such as compressed gas) flowing through the flow path 105 (see FIG. 1) of the pipe in which the flange 1 is provided. Occur. In order to reduce this stress concentration, the inner peripheral surface of the corner of the flange 1 is made into a circular arc surface with a radius of curvature R (for example, the circular arc surfaces 26, 29, 36, and 39 shown in FIG. 1). Thereby, the stress concentration at the corner can be reduced compared to the corner of a conventional flange having a corner on the inner peripheral side (see FIGS. 8A and 8B). However, in the flange 1 formed by joining a plurality of first flange members 2, 3 and second flange members 4, 5, the joints between these members (for example, the joints 11, 12 shown in FIG. 1, 13, 14) must be spaced apart from the corners of the flange 1 to prevent the joint from breaking due to stress concentration.

For example, as shown in FIG. 3, the position P3 of the joint part 12 between the extension part 35 and the side forming part 41 at one corner of the flange 1 is greater than or equal to the separation distance Y based on the above formula (1). It is set at a position spaced apart from the arcuate end portion 36a of the inner circumferential surface (arcface 36). Moreover, the stress concentration at the corner is reduced as the radius of curvature R of the arcuate surface 36 increases. In this case, the position P3 of the joint portion 12 can be moved closer to the corner by an amount corresponding to the reduction in stress concentration. That is, the separation distance Y decreases as the radius of curvature R increases. On the other hand, as the radius of curvature R of the arcuate surface 36 decreases, the stress concentration at the corner increases. In this case, the position P3 of the joint 12 needs to be further away from the corner in order to escape from this stress concentration. That is, the separation distance Y increases as the radius of curvature R decreases.

Furthermore, when focusing on the flow path 105 of the pipe in which the flange 1 is provided, as the radius of curvature R increases, the inner peripheral surface of the flange 1 surrounding the flow path 105 becomes circular in plan view when viewed from the direction of the central axis C. Get closer. In this case, the flange 1 tends to narrow the opening leading to the flow path 105. On the contrary, as the radius of curvature R decreases, the inner circumferential surface of the flange 1 surrounding the flow path 105 approaches a rectangular shape in plan view when viewed from the direction of the central axis C. In this case, the flange 1 tends to widen the opening leading to the flow path 105. That is, increasing the radius of curvature R is effective in reducing stress concentration at the corners of the flange 1, but it narrows the flow path 105 of the pipe. Although reducing the radius of curvature R is effective in securing the flow path 105 of the pipe, it increases stress concentration at the corners of the flange 1. Therefore, in order to sufficiently reduce the stress concentration at the corners of the flange 1 while sufficiently securing the flow path 105 of the pipe, it is preferable that the radius of curvature R is set so as to satisfy a predetermined condition. For example, in the above formula (1), the radius of curvature R (=distance It is preferable to satisfy the following conditions.

Further, as shown in FIG. 3, the joint portion 12 between the extension portion 35 and the side forming portion 41 is formed on the flange 1 in order to prevent damage to the flange 1 when forming the joint hole 6 in the flange 1. It is located so as to be removed from the connecting hole 6 where the connecting hole 6 is connected. For example, if the distance between the position P2 of the arcuate end 36a and the position P4 where the joint hole 6 is formed is equal to the separation distance Y calculated by the above formula (1), the position of the joint part 12 is It is set at a position P5 that is farther away from the arcuate end portion 36a than this position P4. In this case, the separation distance from the position P2 of the arcuate end portion 36a to the position P5 of the joint portion 12 has a value larger than the separation distance Y according to the above equation (1). Thereby, the joint part 12 can be further spaced from the corner (stress concentration part) of the flange 1, and the joint part 12 and the joint hole 6 can be positioned so that they do not overlap with each other.

Although the position of the joint 12 between the first flange member 3 and the second flange member 4 of the flange 1 has been described in FIG. 3, the positions of the remaining joints 11, 13, and 14 of the flange 1 are also explained below. The position is set similarly to the position of the joint portion 12 described above.

(How to cut out flange members)
Next, a method of cutting out the first flange members 2 and 3 and the second flange members 4 and 5 that constitute the above-mentioned flange 1 will be explained. FIG. 4 is a diagram for explaining a method of cutting out a plurality of flange members that constitute a flange according to an embodiment of the present invention. The first flange members 2, 3 and the second flange members 4, 5 are cut out from a plate material such as a metal plate.

Specifically, as shown in FIG. 4, the material plate 8 is made of metal or an alloy containing the metal, and is, for example, a rectangular plate. Two first flange members 2 and 3 are cut out from the frame-shaped outer portion 8a of the material plate 8. Furthermore, two second flange members 4 and 5 are cut out from the inner part 8b surrounded by the outer part 8a. Note that a method for cutting out these plurality of members from the material plate 8 includes, for example, laser processing. Furthermore, the portion of the inner portion 8b that remains after the second flange members 4 and 5 are cut out is treated as waste material, for example.

The first flange members 2, 3 and the second flange members 4, 5 cut out as described above are joined to each other. Specifically, as shown in FIG. 4, the side end 41a of the second flange member 4 is joined to one extending end 25a of the first flange member 2, and A side end portion 51a of the second flange member 5 is joined to the end portion 28a. Further, the side end 41b of the second flange member 4 is joined to one extending end 35a of the first flange member 3, and the second flange member 4 is connected to the other extending end 38a of the first flange member 3. The side ends 51b of No. 5 are joined. Examples of methods for joining these members include welding and the like.

The joints between the extending ends 25a, 35a and the side ends 41a, 41b correspond to the joints 11, 12 shown in FIG. 1, respectively. The joints between the extending ends 28a, 35a and the side ends 51a, 51b correspond to the joints 13, 14 shown in FIG. 1, respectively.

By joining the first flange members 2, 3 and the second flange members 4, 5 described above, a rectangular annular flange 1 is formed. Thereafter, a plurality of coupling holes 6 are formed in the flange 1 except for the joint parts 11, 12, 13, and 14, as shown in FIG. In this way, the flange 1 is manufactured.

On the other hand, FIG. 5 is a diagram for explaining a method of cutting out an integrated flange from a material plate. As shown in FIG. 5, the integral flange 10 is not formed by joining a plurality of members, but is a flange made of an integral annular member. Note that the integrated flange 10 has the same structure as the flange 1 described above, except that there is no joint (seam) between the plurality of members.

Specifically, as shown in FIG. 5, a frame-shaped outer portion 9a is cut out from the material plate 9 as an integrated flange 10. In this way, a one-piece flange 10 is obtained. Although not shown in FIG. 5, a plurality of coupling holes 6 are formed in the integral flange 10, similar to the flange 1 shown in FIG.

Here, in the cutting (manufacturing) of this integrated flange 10, as shown in FIG. All will be treated as waste. Therefore, the proportion of waste material (inner part 9b) in the material plate 9 is much larger than the proportion of the outer part 9a, which is effectively used for manufacturing the integrated flange 10, and the integrated flange 10 is removed from the material plate 9. Yield (material efficiency) during manufacturing is poor. As a result, manufacturing costs increase.

On the other hand, in the flange 1 according to the embodiment of the present invention, as shown in FIG. Each part is cut out from a part that matches the shape of each member. In particular, by cutting out the second flange members 4 and 5 from the inner side 8b of the material plate 8, the inner side 8b is effectively utilized as a constituent member of the flange 1. Therefore, the proportion of waste material in the material plate 8 can be kept lower than in the case of manufacturing the integral flange 10. In addition, the size of the material plate 8 required for manufacturing the flange 1 can be reduced compared to the material plate 9 of the integral flange 10. Thereby, the yield (material efficiency) when manufacturing the flange 1 can be improved and manufacturing costs can be reduced.

(Application example)
Next, an example of application of the flange 1 according to the embodiment of the present invention will be described. FIG. 6 is a schematic diagram showing an example of application of the flange according to the embodiment of the present invention. The flange 1 is used as a flange for joining piping of a marine diesel engine 100, for example, as shown in FIG.

In detail, as shown in FIG. 6, the flange 1 is applied to an air conduit 103 of a marine diesel engine 100. The marine diesel engine 100 includes, for example, a supercharger 101 that compresses combustion gas such as air taken in from the outside, and an air cooler 102 that cools the combustion gas compressed by the supercharger 101. There is. The air conduit 103 is an example of a pipe through which combustion gas of the marine diesel engine 100 flows, and as shown in FIG. 6, communicates the supercharger 101 and the air cooler 102. The flange 1 is attached to the peripheral end of the air conduit 103 and is used to join the midway part of the air conduit 103 to the upper end of the casing of the air cooler 102. The air conduit 103 and the air cooler 102 are connected to each other by fastening a fastening member such as a bolt inserted through a plurality of connecting holes 6 in the flange 1.

As described above, the flange according to the embodiment of the present invention is an annular flange having a corner and a side, the first flange member having a corner forming part forming the corner, and the side. and a second flange member having a side forming part forming a part and joined to the first flange member. The corner forming portion has a predetermined radius of curvature, and extends in a direction away from an arcuate surface forming an inner circumferential surface of the corner and an end of the arcuate surface, and the corner forming portion has a predetermined radius of curvature. an extension part to be joined, and a joint part between the extension part and the side forming part has a separation distance set based on the radius of curvature and the width of the side forming part, He is trying to space it apart from the end of the circular arc surface.

Therefore, the joint portion between the extension portion and the side forming portion can be sufficiently spaced from the stress concentration portion at the corner of the flange. Thereby, it is possible to avoid a situation where the joint portion is damaged due to the influence of the stress concentration, and as a result, damage to the flange due to stress concentration can be suppressed.

Further, in the flange according to the embodiment of the present invention, the separation distance of the joint portion from the end of the arcuate surface is set to decrease as the radius of curvature increases, and increase as the radius of curvature decreases. are doing. Therefore, the separation distance can be decreased as the stress concentration at the corner of the flange decreases, and the separation distance can be increased as the stress concentration increases. Thereby, the position of the joint portion can be set at a position appropriately spaced from the corner of the flange depending on the degree of stress concentration without being unnecessarily separated from the corner of the flange. As a result, each length of the extension part and the side forming part can be appropriately set according to the shape of the intended flange, so the first flange member and the second flange member can be efficiently assembled from the material plate. The flange can be cut out to improve material efficiency and reduce manufacturing costs when manufacturing the flange.

Further, in the flange according to the embodiment of the present invention, the joint portion between the extension portion and the side forming portion is formed at a position that is removed from the joint hole (insertion hole through which the fastening member is inserted) formed in the flange. ing. Therefore, it is possible to avoid a situation where the joint portion and the joint hole overlap in the flange, and thereby it is possible to prevent the joint portion from being damaged when forming the joint hole.

(Modified example)
Next, a flange according to a modification of the embodiment of the present invention will be described. FIG. 7 is a schematic diagram showing a modified example of the flange according to the embodiment of the present invention. The flange 1A according to this modification has a different number of plate members than the flange 1 according to the embodiment described above, for example, as shown in FIG. The second flange members 4, 4A, 5, and 5A are provided. The other configurations are the same as in the embodiment described above, and the same components are given the same reference numerals.

As shown in FIG. 7, the first flange members 2A, 2B, 3A, and 3B each have a corner forming portion that forms a corner of the flange 1A. Specifically, the first flange member 2A includes a corner forming portion main body 24 and extension portions 25, 25A. The extending portion 25A has the same structure as the extending portion 25 except that the direction of arrangement on the flange 1A is different from that of the extending portion 25. The first flange member 2B has a corner forming portion main body 27 and extension portions 28 and 28A. The extending portion 28A has the same structure as the extending portion 28 except that the direction of arrangement on the flange 1A is different from that of the extending portion 28. The first flange member 3A has a corner forming portion main body 34 and extension portions 35, 35A. The extending portion 35A has the same structure as the extending portion 35 except that the direction of arrangement on the flange 1A is different from that of the extending portion 35. The first flange member 3B has a corner forming portion main body 37 and extension portions 38 and 38A. The extending portion 38A has the same structure as the extending portion 38 except that the direction of arrangement on the flange 1A is different from that of the extending portion 38.

The second flange members 4A and 5A are members having side forming portions that form the sides of the flange 1A. Specifically, the side forming portion of the second flange member 4A forms the side between the first flange members 2A and 2B. The side forming portion of the second flange member 5A forms a side between the first flange members 3A and 3B. The second flange members 4A, 5A have the same structure as the second flange members 4, 5 except that the direction of arrangement on the flange 1A is different from that of the second flange members 4, 5.

Further, as shown in FIG. 7, the end of the extending portion 25 of the first flange member 2A is joined to the side end of the second flange member 4, and the end of the extending portion 25A of the first flange member 2A is joined to the side end of the second flange member 4. It is joined to the side end portion of the second flange member 4A. The end of the extending portion 28 of the first flange member 2B is joined to the side end of the second flange member 5, and the end of the extending portion 28A of the first flange member 2B is joined to the side end of the second flange member 4A. is joined to. The end of the extending portion 35 of the first flange member 3A is joined to the side end of the second flange member 4, and the end of the extending portion 35A of the first flange member 3A is joined to the side end of the second flange member 5A. is joined to. The end of the extending portion 38 of the first flange member 3B is joined to the side end of the second flange member 5, and the end of the extending portion 38A of the first flange member 3B is joined to the side end of the second flange member 5A. is joined to. The positions of the joints between these members are set in the same manner as the positions of the joints 11, 12, 13, and 14 in the embodiment described above.

The flange 1A according to the above-described modification also has the same structure as the above-described embodiment except that the number of constituent members is different, so that it enjoys the same effects as the above-described embodiment. In addition, since the flange 1A is made up of more members than the flange 1 according to the embodiment described above, the plurality of constituent members of the flange 1A can be cut out from the material plate more efficiently. The material efficiency during manufacturing can be further improved.

In addition, in the embodiment and modification described above, the number of first flange members and second flange members constituting the flange is two or four, but the present invention is not limited to this. . For example, the number of the first flange member and the second flange member may be one or more.

Furthermore, in the above-described embodiments and modifications, the flange is rectangular (specifically square) in plan view when viewed from the central axis direction of the flow path of the pipe in which the flange is provided. It is not limited. For example, the shape of the flange according to the present invention in plan view may be a rectangle, a triangle, or a polygon of quadrangle or more.

Further, in the above-described embodiments and modified examples, the first flange member and the second flange member having mutually symmetrical structures are illustrated, but the present invention is not limited thereto. For example, the first flange member and the second flange member described above do not need to have a symmetrical structure.

Furthermore, in the above-described embodiments and modifications, the flanges applied to piping through which combustion gas of a marine diesel engine flows are exemplified, but the present invention is not limited thereto. For example, the piping to which the flange according to the present invention is applied may be the piping of an internal combustion engine other than a marine diesel engine, or the piping of an internal combustion engine other than an internal combustion engine. Further, the pipe may be a pipe through which a fluid other than the combustion gas, for example, a liquid such as fuel, flows.

Furthermore, in the above-described embodiments and modified examples, the widths of the respective sides of the flange (for example, the plate widths W of the side forming portions 33 and 41 shown in FIG. 3) are set to the same value, but the present invention has the same value. It is not limited. For example, the widths of each side of the flange may be different values. Alternatively, the flange may have a mixture of widths having different values and widths having the same value.

Furthermore, the present invention is not limited to the above-described embodiments and modified examples, and the present invention also includes configurations in which the above-described components are appropriately combined. In addition, all other embodiments, examples, operational techniques, etc. made by those skilled in the art based on the above-described embodiments and modifications are included in the scope of the present invention.

1, 1A Flange 2, 2A, 2B, 3, 3A, 3B First flange member 4, 4A, 5, 5A Second flange member 6 Connection hole 8, 9 Material plate 8a, 9a Outside part 8b, 9b Inside part 10 One Body flange 11, 12, 13, 14 Joint part 21, 22, 31, 32 Corner forming part 23, 33 Side forming part 24, 27, 34, 37 Corner forming part body 24a, 24b, 27a, 27b, 34a, 34b, 37a, 37b End portion 25, 25A, 28, 28A, 35, 35A, 38, 38A Extension portion 25a, 28a, 35a, 38a Extension end portion 26, 29, 36, 39 Arc surface 26a, 26b, 29a, 29b , 36a, 36b, 39a, 39b arc end portion 41, 51 side forming portion 41a, 41b, 51a, 51b side end portion 100 marine diesel engine 101 supercharger 102 air cooler 103 air conduit 105 flow path 201, 211 conventional Flange 202, 203, 204, 205, 212, 213, 214, 215 Plate member 206, 216 Joint C Central axis P1, P2, P3, P4, P5 Position

Claims (6)

An annular flange having a corner and a side,
a first flange member having a corner forming part forming the corner;
a second flange member having a side forming part forming the side part and joined to the first flange member;
Equipped with
The corner forming portion is
an arcuate surface having a predetermined radius of curvature and forming an inner circumferential surface of the corner;
an extension part extending in a direction away from an end of the arcuate surface and joined to the side forming part;
Equipped with
The joint portion between the extension portion and the side forming portion is spaced apart from the end of the arcuate surface by a distance set based on the radius of curvature and the width of the side forming portion.
A flange characterized by: The separation distance decreases as the radius of curvature increases, and increases as the radius of curvature decreases.
The flange according to claim 1, characterized in that: It further includes an insertion hole for inserting the fastening member,
a joint between the extension portion and the side forming portion is located so as to be removed from the insertion hole;
The flange according to claim 1 or 2, characterized in that: each of the first flange member and the second flange member is plural;
The flange according to any one of claims 1 to 3, characterized in that: The first flange member further includes the side forming part formed integrally with the corner forming part.
The flange according to any one of claims 1 to 4, characterized in that: The flange is provided at the peripheral end of a pipe through which combustion gas of a marine diesel engine flows.
The flange according to any one of claims 1 to 5, characterized in that:

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