Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L27/00—Adjustable joints, Joints allowing movement
  • F16L27/08—Adjustable joints, Joints allowing movement allowing adjustment or movement only about the axis of one pipe
  • F16L27/0849—Adjustable joints, Joints allowing movement allowing adjustment or movement only about the axis of one pipe the fluid being turned through an angle when passing from one joint element to another

Definitions

• the present invention relates to adjustable pipe bends wherein the one bend can accommodate a change in direction throughout a wide range of angles.
• 1,123,839 are directed towards adjustable pipe couplings and means of securing their relative parts together. They have not considered the flow path problems. This is also the case with the present inventor's earlier application as set forth in German Offenlegungschrift 2,325,757.
• an adjustable pipe bend having an inlet portion and an outlet portion sealingly connected by circular mating seal surfaces, and wherein at least one of said portions consists of a first throat remote from said surface and a curved part joining said first throat to said surface, and wherein said curved part forms a segment of a sphere on the one side and said first throat is at least partially tangential to said sphere.
• Fig. 1 is a schematic sectioned side elevation of an adjustable pipe bend
• Fig. 2 is a schematic sectioned side elevation of one half of the adjustable pipe bend of Fig. 1;
• Fig. 4 is a schematic sectioned side elevation of a modified form of the bend of Fig. 1.
• Fig. 5 is a schematic sectional side elevation of a further modified form of the bend of Fig. 1.
• a pipe bend 10 consists of two half portions 11 and 12, which in the present instance are identical. However it should be appreciated that the half portion 12 is viewed at 90° rotation to the half por.tion 11.
• Each identical half portion 11 and 12 is provided with an annular flange 13, with the flange 13 providing circular mating surfaces having a centre at the intersection of the two axes 14 and 15.
• the flanges 13 are provided with a plurality of slots (as best seen in Fig. 3) through which bolts or threaded fasteners (not shown) may pass to secure the two half portions 11 and 12 together.
• Portions 11 and 12 although shown as identical could in fact be different.
• the half portion 11 includes a first frusto-conical throat 16 defining a passage of increasing cross-sectional area from the pipe connecting end flanges 22 towards the joint flanges 13.
• the throat part 16 terminates with a curved portion 17 which forms part of an imaginary sphere 18 (Fig. 1). Still further, the throat 16 is joined to the flange 13 by an arcuate portion 19.
• the portion 19 also extends as a tangent to the imaginary sphere 18.
• the throat 16 has as its longitudinal axis the axis 22.
• the throat 16 half portion 12 is also of generally frusto-conical section and extends as a tangent to the sphere 18 .
• the flanges 13 are provided with a plurality of angularly extending slots 20 which enable the two half portions 11 and 12 to be secured together by threaded fasteners.
• the slots 20 are spaced and are of adequate length to enable relative rotation between the two half portions 11 and 12 about the axis 15, to provide for angular adjustment between the half portions 11 and 12, to create a bend having an included angle from 90° to 180°.
• the half portion 11 defines a passage 21 which has a centre extending along the line 22.
• the line 22 does not extend radially from the centre of the sphere 18. This enables the diameter of the imaginary sphere 18 to more closely approach the diameter of the pipe run into which it is located.
• a pipe bend constructed of two half portions identical to the half portion 11, is provided, then relative rotation between the two half portions will enable angular adjustment between the two throats 16 so that the pipe bend can then accommodate an included angular difference between the two half portions of 90° to 180°.
• Such angular adjustment is accommodated by the flanges 13 providing circular mating surfaces extending at 45° to the axis 14.
• the axis 14 joins the centre of the throat inlet to the centre of the plane joining the two bend portions. It also is an extension of the flow axis of the pipe to which it is joined.
• FIG. 4 A modification of the pipe bend is shown in Fig. 4 wherein the first portion 11 is identical to the second portion 12 but the radial axis 14 is at a much less angle than 45° to the plane of the joined flanges 13. This allows for moderate bends where an absolute minimum disturbance to the path of flow is required. Further it can be used to join two pipes in a straight run with minimal change of cross sectional area between the flange ends 22.
• the pipe bend of Fig. 4 is also provided with a lining 23 which is applied to piping for carrying corrosive or erosive substances.
• the bend, shown in Figure 5 illustrates a further embodiment wherein the ratio of the sphere 18 diameter to the throat 16 diameter is reduced whilst at the same time
• the throat 16 ( Figure 5) is of cylindrical configuration.
• Fig. 5 shows the throat 16 of parallel (cylindrical) section between a transition region
• the throat face at end flange 22 is normal to the radial line 14 from the sphere centre.
• the throat axis 22 can be seen to be offset to the radial axis 14.
• the one bend is used for all angles, obviating the need to stock numerous bends for each angle.
• the above discussed preferred embodiment of the present invention has the advantage of providing a pipe bend which offers minimum resistance to the flow of fluid.
• the above discussed preferred embodiment has the advantage of minimising the size of the pipe bend and therefore lowering the cost of manufacture thereof.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Pipe Accessories (AREA)

Applications Claiming Priority (4)

Publications (1)

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Family Cites Families (5)

• 1986
  • 1986-07-11 EP EP19860904047 patent/EP0228418A1/de active Pending
  • 1986-07-11 WO PCT/AU1986/000192 patent/WO1987000601A1/en unknown

Non-Patent Citations (1)

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