Rotary kinetic fluid motors or pumps – Working fluid passage or distributing means associated with... – Casing having multiple parts welded – cemented – or fused
Patent
1990-08-24
1992-07-28
Look, Edward K.
Rotary kinetic fluid motors or pumps
Working fluid passage or distributing means associated with...
Casing having multiple parts welded, cemented, or fused
4151821, 415206, 285412, 403337, F01D 2524
Patent
active
051336421
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a structure of a pipe joint at each or either one of the suction and discharge opening sides of a pump produced from steel plate, for example, stainless steel plate.
BACKGROUND ART
A typical conventional pipe joint of a pump produced from steel plate has a structure such as that shown in FIG. 1. At the discharge side, a pipe connecting flange 2 having a discharge opening 2a is welded to a discharge opening portion provided in the peripheral surface portion 1a of a casing body 1, and a thick-walled iron plate 3 is welded to the reverse side of the flange face of the pipe connecting flange 2.
At the suction side, on the other hand, a suction flange 4 having a suction opening 4a is welded to a suction opening portion provided in the suction-side side surface portion 1b of the casing body 1, and a thick-walled steel plate 5 having a bolt hole 5a is welded to the reverse side of the suction flange 4. It should be noted that in the figure, the reference numeral 6 denotes a suction partition plate, 7 a volute inner wall having bores 7a in the periphery thereof, 8 a casing cover, and 9 an impeller.
In the prior art shown in FIG. 2, a box shaped support member 15 is provided at the suction joint of a pump casing 11 formed from a thin plate (steel plate) in such a manner that the box shaped support member 15 surrounds a short suction pipe 12, the box shaped support member 15 comprising a suction-side casing wall 11a, a connecting flange 13 and a support member 14 which extends between the connecting flange 13 and the pump casing 11. In the figure, the reference numeral 16 denotes a casing end wall (see West Germany Patent Laid-Open Publication No. 3517828).
In the above-described prior art, the one (FIG. 1) in which a thick-walled steel plate is welded to the reverse side of the flange face of the pipe connecting flange has a disadvantageously high cost, although the flange face portion has a satisfactorily high strength. In the prior art (FIG. 2) in which the suction-side connecting flange 13 is supported by the support member 14 that is disposed outside the short suction pipe 12, since the whole of the connecting flange 13 having a thick wall, needs to be formed using a corrosion-resistant material and further, since the intermediary water passage (short suction pipe) 12 is also a separate member, the prior art necessitates the expenditure of a great many of man-hours and the cost is high.
In view of the above-described circumstances, it is an object of the present invention to provide a pipe joint for a pump which has a corrosion-resistant flow path and high rigidity at the flange joint surface and which is capable of preventing deformation by the application of an external force to the flange.
DISCLOSURE OF THE INVENTION
To attain the above-described object, the present invention provides the following structure for a pump pipe joint.
The pipe joint for a pump according to the invention comprises a flange body produced from a steel plate such that the inner peripheral portion thereof that defines a water passage is extended toward the casing body and secured by welding to an outlet/inlet opening in the casing body directly or through a cylindrical member, the flange body having a plurality of bolt holes provided in a flange face thereof, and a retainer plate installed in such a manner as to abut against the reverse side of the flange face, the retainer plate having an annular rib with a square outer shape and a U-shaped cross section which projects toward the casing body, the annular rib being provided in the bottom of the U-shaped cross section with a plurality of bolt holes respectively corresponding to the bolt holes in the flanges face, the retainer plate further having a raised face formed integral with the annular rib at the inner side thereof such that the raised face abuts against the reverse side of the flange face. The retainer plate may have another raised face formed integral with the annular rib at the outer side thereof such that the secondrai
REFERENCES:
patent: 5040947 (1991-08-01), Kajiwara et al.
PCT/DE86/00188 WO, Al, 86/06800 (Klein, Schanzlin & Beckr Aktiengesellschaft) Nov. 20, 1986.
Ebara Corporation
Look Edward K.
Verdier Christopher M.
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