US1842947A

US1842947A - Vapor discharge device

Info

Publication number: US1842947A
Application number: US333261A
Authority: US
Inventors: John C Read
Original assignee: General Electric Co
Current assignee: General Electric Co
Priority date: 1928-02-16
Filing date: 1929-01-18
Publication date: 1932-01-26
Anticipated expiration: 1949-01-26

Description

J C. READ VAPOR DISCHARGE DEVICE Filed Jan. 18, 1929 Inventor. Y J'ohn.C.FQea.ci. W 2

- Hie Attorneg Patented Jan. 26, 1932 UNITED STATES CORPORATION OF NEW YORK VAPOR mscnensn DEVICE H Application filed January 18, 1929, Serial No. 333,261, and in Great Britain February 16, 1928.

My invention relates to vapor discharge devices such as mercury arc rectifiers for ex-- ample, and has for its principal object the provision of an improved means whereby the r vacuum chamber of the device may be effectively evacuated during operation.

In mercury arc rectifiers, if the connecting pipe leading from the Vacuum chamber to the evacuating pump is placed at the centre of the chamber, then there is risk that air may be trapped in the corners of the chamber near the anodes; and if the pipe is placed near the anodes air is trapped at the centre of the tank; since in both cases the violent J blast of mercury vapor issuing from thecathode during operation tends to drive air before it into the various pockets in the chamher, and thereby prevent it from being evacuated by the pump. It is undesirable to provide several pipes from the vacuum chamber to the pump to eliminate this trouble, on

account of the complication and dificulty of making vacuum-tlght Jomts. I

The present inventlon consists in connecting the evacuating pipe of the vacuum pump.

leading to the vacuum pump is shown at the centre of the vacuum chamber. It is found that with this position of the evacuating pipe there is sometimes a tendency for air to be trapped by the mercury vapor blast at the rim 6 of the tank and this cannot be prevented by attaching the evacuating pipe at 6 because in that case air is sometimes trapped in the centre of the tank instead. Internal ducts or pipes 7 are therefore provided leading to the pipe 5 from points where air may be expected to be trapped.

In this Way air is drained away from any pockets in the vacuum chamber without being influenced by the blast of mercury vapor,

r was.

JOHN G. READ, or RUGBY, ENGLAND, ASSIGNOR T GENERAL ELncrnIc COMPANY, n

and at the same time, since these drain pipes.

are entirely insidethe vacuum chamber, no additional vacuum-tightjoints are required.

In arranging such internal air drain ducts it is desirable to malre the coolest part-of the duct be the end which is adjacent Y to the evacuating pipe; This insures that any flow of mercury vapor which takes place along the duct will. bein the direction to help the air flow to pipe rather than ina direction to I it might be expected to collect.

What I claim as new and desire to secure by Letters Patent of the United States is:

1. A vapor discharge device including an evacuated vessel, an exhaust pipe attached thereto and opening into the upper portion of said vessel to drain air from said portion,

and a second pipe located within said vessel extending into the end of said exhaust pipe from another point within said vessel to drain air into said exhaust pipe from another portion of said vessel.

2. A'Vapor discharge device including an evacuated vessel, an exhaust pipe attached thereto and opening into the upper portion of said vessel to drain air from said portion, and a plurality of ducts within said vessel opening into the end of said pipe and leading from said pipe to separate points within said vessel to drain air into said exhaust pipe from other portions of said vessel.

3. A vapor discharge deviceincluding an evacuated vessel, an exhaust pipe attached thereto, a plurality of pipes extending from separate points within said vessel into the end of said pipe, and means for cooling said evacuating pipe.

4. A vapor discharge device including an evacuated vessel provided With anode chambers, an exhaust pipe attached to said vessel, and means for evacuating said anode chamhers including a plurality of pipes within said vessel and extending from said anode chambers into the mouth of said exhausting p A vapor discharge device including an evacuated vessel, an exhaust pipe attached thereto, and a plurality of ducts Within said vessel leading from separate points therein and extending into the end of said exhaust pipe.

6. A vapor discharge device including an evacuated vessel, an exhaust pipe attached to said vessel, and a plurality of pipes mounted Within said vessel and leading respectively to said exhaust pipe from points Within said vessel at which air tends to collect.

7. A vapor discharge device including an evacuated vessel, an exhaust pipe attached to said vessel at a point at Which air tends to collect, and a plurality of ducts Within said vessel and leading respectively to said exhaust pipe from other points Within said vessel at which air tends to be trapped, to cause said trapped air to be evacuated by 25 said exhaust pipe.

In Witness whereof, I hereunto set my hand, this 1st day of January, 1929.

JOHN C. READ.