Case structure for rotary machines
First Claim
1. A case structure for rotary machines of the type having prevailingly axial extension and at least one stationary portion and at least one rotary portion, in particular for electric motors and multistage pumps, the case structure comprising at least one tubular member having two ends and a plurality of roll-formed threaded portions and at least one roll-formed groove in the wall of said tubular member, said plurality of threaded portions including at least one threaded portion for threadably supporting said at least one stationary portion within said at least one tubular member, at least another threaded portion between said at least one threaded portion and one of said ends for threadable engagement with a support for said at least one rotary portion within said at least one tubular member, and at least one further threaded portion at each of said ends for threadably engaging respective end caps of said case, said threaded portions having a depth such as to allow subsequent insertion and removal in an axial direction of said at least one stationary portion and said at least one rotary portion through said one of said ends into, and out of, said tubular member, and said at least one groove being arranged at a position adjacent said at least one threaded portion and having a depth such as to lock axially at least said at least one stationary portion.
2 Assignments
0 Petitions
Accused Products
Abstract
A case structure for rotary machines, particularly electric motors and multi-stage pumps having a prevailingly axial length, comprising a tubular member having roll-formed threads and at least one roll-formed groove in the peripheral wall for threadably engaging a fixed portion of the machine, a support for a rotary portion of the machine and two threaded caps at the ends of the tubular member. The threads may extend continuously along the wall of the tubular member. The machine portions are therefore easily assemblable and disassemblable by threading through one end of the tubular member, and the groove clamps the machine portions in the tubular member. Rolling of the threads provides stiffening and calibration of the tubular member, thus making it particularly suitable for machines having a great axial extension and small transverse dimension.
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Citations
8 Claims
- 1. A case structure for rotary machines of the type having prevailingly axial extension and at least one stationary portion and at least one rotary portion, in particular for electric motors and multistage pumps, the case structure comprising at least one tubular member having two ends and a plurality of roll-formed threaded portions and at least one roll-formed groove in the wall of said tubular member, said plurality of threaded portions including at least one threaded portion for threadably supporting said at least one stationary portion within said at least one tubular member, at least another threaded portion between said at least one threaded portion and one of said ends for threadable engagement with a support for said at least one rotary portion within said at least one tubular member, and at least one further threaded portion at each of said ends for threadably engaging respective end caps of said case, said threaded portions having a depth such as to allow subsequent insertion and removal in an axial direction of said at least one stationary portion and said at least one rotary portion through said one of said ends into, and out of, said tubular member, and said at least one groove being arranged at a position adjacent said at least one threaded portion and having a depth such as to lock axially at least said at least one stationary portion.
Specification