JP2012117607A - Expansion pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such the problem that the expansion/contraction of a joint is hindered due to contact of a rubber seal with en exit outer cylinder, when the position of a device or piping to be connected changes largely, or when eccentricity caused by vibration during driving of the device side is large.SOLUTION: In an expansion pipe joint 1 having a loose flange 2 and an exit outer cylinder 4 connected by a bellows 3, a cylindrical part 10 through which fluid flows is disposed in the loose flange 2, an inner cylinder 11 for preventing contact of the fluid with the bellows 3 is connected to the lower end of the cylindrical part 10 via a bendable connection part 13, and a sliding support member 14 bent following displacement of the exit outer cylinder 4 is disposed in the lower part of the inner cylinder 11.

Description

  The present invention relates to an expansion joint used in, for example, a connecting portion where a displacement occurs in equipment of a powder processing facility and piping.

  Expansion pipe joints are joints that are widely used to connect equipment and pipes in equipment for processing powder. Between expansion equipment and pipes where displacement occurs due to changes in operating temperature or the weight of powder handled. It is a component that has a function of connecting and connecting it by flexibly absorbing horizontal eccentricity and vertical vibration.

  FIG. 3 is a longitudinal sectional view showing a conventional example of an expansion pipe joint.

  In FIG. 3, a loose flange 2 and a metal bellows 3 are attached to a lap joint (lap joint) 5 constituting the expansion joint 1 and the metal bellows 3 is attached to the other end by an outlet outer tube 4 by welding. ing. A cylindrical portion 10 having an inner cylinder 11 is provided inside the lap joint 5, and a rubber seal 12 is attached to the lower portion of the inner cylinder 11.

  The powder flowing in this configuration passes through the inside of the expansion joint 1 from the lap joint 5 toward the outlet outer cylinder 4. At this time, the inner cylinder 11 and the rubber seal 12 function to prevent the powder passing through the expansion joint 1 from coming into contact with the metal bellows 3, and the metal bellows 3 is seized or corroded by contact with the powder. To prevent that.

Japanese Utility Model Publication 3-11512

  If the powder to be handled is very hot, the position of the connected equipment and piping will fluctuate greatly due to thermal expansion, causing displacement, or if the eccentricity due to vibration when the equipment is driven is large, a rubber seal And the outer shell of the outlet contacted, and the expansion and contraction of the joint was hindered, and there was a problem that had an adverse effect on the weighing function on the equipment side in the powder handling equipment.

  Also, if the eccentricity is large, the rubber seal or inner cylinder interferes with and adheres to the outlet inner cylinder, so there is a possibility that the connection using the expansion pipe joint cannot be made. From the side where the gap becomes larger, the powder may enter and adversely affect the metal bellows.

  An object of the present invention is to solve the above-described problems, and by making the inner tube of the expansion joint a bendable structure, the contact reaction force between the rubber seal and the outer tube can be reduced and bent. Accordingly, the inner cylinder follows the eccentricity of the outlet outer cylinder, thereby providing an expansion / contraction pipe joint that does not impair the expansion / contraction function and is adaptable to vibration and eccentricity larger than those in the past.

  The present invention provides an expansion tube joint in which a loose flange and an outlet outer cylinder are connected by a bellows, a cylindrical portion through which fluid flows is disposed in the loose flange, and fluid contact with the bellows is provided at a lower end portion of the cylindrical portion. The inner cylinder to be prevented is connected via a bendable connecting portion, and a sliding support member that is bent following the displacement of the outlet outer cylinder is provided at the lower portion of the inner cylinder.

  In the present invention, since the inner cylinder is bent with respect to the cylindrical portion and follows the deformation, the reaction force of the sliding support member against the outlet outer cylinder is reduced, and the frictional resistance generated between the sliding support member and the outlet outer cylinder is reduced. Therefore, the expansion joint can be expanded and contracted smoothly, and an expansion joint that can be adapted to vibration and eccentricity can be provided.

The Example of the expansion-contraction pipe joint which concerns on this invention is shown, (a) is a longitudinal state, (b) shows a stretched state, (b) shows a bending state, respectively. The other Example of the expansion-contraction pipe joint which concerns on this invention is shown, (a) is a longitudinal state which shows a stretched state, (b) shows a bending state, respectively. The longitudinal cross-sectional view which shows the prior art example of an expansion pipe joint.

  An embodiment of an expansion joint according to the present invention will be described below with reference to FIG.

  1A and 1B show examples of the expansion joint according to the present embodiment, wherein FIG. 1A is a longitudinal sectional view showing a stretched state and FIG. 1B is a bent state, and the same parts as FIG. A reference numeral is attached and description of the configuration of the portion is omitted.

  In addition, FIG. 1 demonstrates the expansion pipe joint which concerns on this embodiment as what was applied to the connection of the powder meter of a nuclear power plant waste processing facility, and inlet piping.

  In FIG. 1, a cylindrical portion 10 disposed inside a lap joint 5 is provided in an expansion tube joint 1 with an inner cylinder 11 via a cushioning material 13 having an elastic seal function such as rubber, a spring, and a foamed plastic material. And bendably connected. A Teflon (registered trademark) lip 14, which is a sliding support member having a triangular cross-section with a bottom surface of a low friction support surface, is arranged at the lower portion of the inner cylinder 11 following the displacement of the outlet outer cylinder 4. Has been.

  In this configuration, when the high-temperature powder (fluid) circulates inside the expansion pipe joint 1, the expansion and contraction of the pipe portion is heated up to several tens of degrees to prevent the powder to be handled from sticking. And the joint is compressed axially close to 10 mm. In addition, the vibration when the device connected to the expansion joint 1 such as a feeder for discharging the powder is driven causes eccentricity of a maximum of several millimeters in the horizontal direction.

  The expansion joint 1 is bent while following the displacement of the outlet outer cylinder 4 while the inner cylinder 11 is flexibly supported by the cylindrical portion 10 by the buffer material 13, and the low friction sliding support member 14 is the outlet outer cylinder. 4 and can slide smoothly in contact with the inner surface.

  In the present embodiment, since the inner cylinder 11 is bent with respect to the cylindrical portion 11 and deforms following the deformation, the reaction force of the sliding support member (Teflon lip) 14 with respect to the outlet outer cylinder 4 becomes small, and sliding Since the frictional resistance generated between the support member 14 and the outlet outer cylinder 4 is also kept small, the expansion joint 1 can be expanded and contracted smoothly and can be used without degrading the measurement accuracy of the powder meter. It becomes possible.

  Further, the possibility of breakage is reduced by reducing the reaction force, and the life of the expansion joint 1 can be improved.

  In addition, in the said embodiment, although the substance which distribute | circulates the inside of the cylindrical part 11 and the inner cylinder 11 was demonstrated with the example of powder, it is applicable also to general fluids, such as a liquid. Moreover, in the said embodiment, although the bellows was demonstrated as the metal bellows 3, the material shall be suitably selected with the fluid which distribute | circulates an inside. Furthermore, although the example of the Teflon material is shown in the sliding support member 14, it is also possible to use a synthetic resin material having a high temperature resistance and a metal material having a high sliding property.

  Hereinafter, another embodiment of the expansion joint according to the present invention will be described with reference to FIG.

  2A and 2B show another example of the expansion joint according to the present embodiment. FIG. 2A is a longitudinal sectional view showing a stretched state and FIG. 2B is a bent state. Are denoted by the same reference numerals, and description of the configuration of the portions is omitted.

  FIG. 2 also shows the expansion pipe joint according to this embodiment applied to the connection between the powder meter of the nuclear power plant waste treatment facility and the inlet pipe.

  In FIG. 2, the expansion joint 1 has a cylindrical portion 10 disposed inside a lap joint 5 connected to an inner cylinder 11 via a spherical bearing 16 so as to be freely bent. A sliding support member 14 that bends and follows the displacement of the outlet outer cylinder 4 and that has a low friction is disposed below the inner cylinder 11.

  The expansion joint 1 is bent while following the displacement of the outlet outer cylinder 4 while the inner cylinder 11 is supported on the cylindrical portion 10 by the spherical bearing 16, and the low friction sliding support member 14 is provided on the outlet outer cylinder 4. It can slide smoothly in contact with the inner surface.

  Therefore, since the number of parts can be reduced, the same effect as the expansion joint shown in FIG. 1 can be achieved with an easier configuration.

  DESCRIPTION OF SYMBOLS 1 ... Expansion joint, 2 ... Loose flange, 3 ... Metal bellows, 4 ... Outlet outer cylinder, 5 ... Lap joint (lap joint), 10 ... Cylindrical part, 11 ..Inner cylinder, 12 ... rubber seal, 13 ... cushioning material, 14 ... sliding support member (Teflon lip), 16 ... spherical bearing.

Claims (3)

  An expansion pipe joint in which a loose flange and an outlet outer cylinder are connected by a bellows, an inner cylinder in which a cylindrical portion through which fluid flows is disposed in the loose flange, and fluid contact with the bellows is prevented at the lower end of the cylindrical portion And a sliding support member that bends following the displacement of the outlet outer cylinder at a lower portion of the inner cylinder.   The expansion joint according to claim 1, wherein the connection portion is configured by a stretchable cushioning material disposed between the cylindrical portion and the inner tube.   The expansion joint according to claim 1, wherein the connection portion is constituted by a spherical bearing formed on each of the cylindrical portion and the inner tube.

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