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Патент USA US2124390

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July 119, 1933I
2,124,390
F. H. ANDERSON
'
VACUUM PUMP APPARATUS
' Filed May 7, 19:55
Inventor: _ ‘
F.N
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; “me-em PUMP/‘APPARATUS ‘
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1 ‘Frederick-1H."Anderson, Schenectady, N.‘ Yr,f_as~ ‘
gsignor to General Electric-‘Company, a corpora-t
tion ofyNew York
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' Application
'
i' ,4 ‘Claims.
May 7, (01.
1935,
fast-222')
Se?aPNoLfZDJSS'
“
v‘ I ‘My‘inventio'n relates tot/vacuum pump apparel-j
l21 'jtus,
operating
particularly
inconnectionf
t'o‘jroughing
with pump
a- highapparatus
vacuum
a
mercury condensation "pump for' evacuating
5 ‘mercury arcfrecti?ers or like devices of the ‘metal
"tank type; ‘andfit's‘general‘ objectis‘ to provide a‘
t _ yacuum pumpvapparatus of ‘this character “which
s A
.
"long .enbugh ~to " clear the ‘pump chamber and ' ‘ n
the-termination
pump suctionpipe
of ofthis
all predetermined
oil‘or foreign gases._
time ‘ in
‘At ‘
terval the valve ‘control means operated“ to close
- the relief valve, thereby cutting off the‘connec- 5
‘tionlof the pumplsuction pipe‘to atmosphere and} ~ '
_‘simultaneously'; to open the intake valve thereby“ .
‘is of *simplifledand‘durable construction and of > to connect the pump suction pipe to vthe exhaust v "
increased e?icie'ncy'and reliability _1i'n‘operation.‘
10
'
A particular object‘. of the invention is to pro-
' vide, for the -vacuum pump‘ apparatus, a valve
pipeline of ‘the recti?er ‘for‘normal- evacuationof
the recti?er tank.
v‘
‘
' -
-'
‘
,
‘I 10 a
‘My invention will be better understood from the’
i means and automatically voperated control means ‘following descriptionwhen consideredin connec
therefor'so' arranged that “high starting ‘1 torque‘ ;_ tion" with the accompanying‘ydrawing ‘and its;
t ' usually required in ‘operation of the vacuum pump, scope will be pointed out in?th'e appended claims; *
"ld‘and ‘di‘f?cultlesgdue tofcreepa'ge of oil from the I ‘ Referring f‘to" the ‘drawing; the" ‘single? ?gure 15" ‘
“ , pump intocoritactwith valve‘ members'or‘due to thereof is a“ semi-diagrammatic cross; sectional n‘
'
l “ “ jc‘reepagebf voil‘into the vacuum‘ chamber of the "viewuof la‘vacujum pumpjmechanism, 'fori'an iron‘
‘
recti?er or, likeldevice; are‘ obviated.
_, ‘
gdyen'tion
,i' [The 'pump'apparatus'in‘which
‘has beentembodied preferably
my includes
present in‘an
tarik‘r'ecti?ér or the‘like,‘ in?which'my invention
has
= Inbeen
the ?gure,
embodied.’
the'lnumeral'l
' ‘
“‘designates
‘
'a" ver‘ ' t 20
electrically drivenfpump mechanism whichvis es-_ ' tically mounted rotary exhaust" pump‘driven by"
‘
'sentially similar to pump‘:mechanisms‘heretofore ‘an electric motor ‘2.’ The pump and"motor' ‘are; .
‘ utilized as foompressor‘s' for“refrigerator. appara- enclosed in a casing‘ 3 normally ?lledfwitli oil to
,
"'tus.“ This pump" mechanism is, preferably ver- “such a heightjtha't the'pump is totally‘submerged “ ' ~
‘25 tically- mou’nt‘edgthé rotary pump itselfbeing sub
in the oil ‘bath to‘ prevent'air or ‘other‘gas'es from "25 ‘ ‘
s ””contairier‘and
‘ merged in an being"
oil“ bath,
driven
in a-bysubstantially
an electric sealed
motor " h‘austygas'e‘s'l
ente'ringthe from
pumpjandto
‘the, recti?er
‘seal enter
the pump.
the pump
Ex- ,'
;‘mounted in‘ the container'and aboveltherotary through agpu‘mpjsuction‘ pipe ‘_4 and afteripass
‘
‘pump.
'
“
“
.
y
[s
. "
‘
‘'‘ingthrough' the pump and pump exhaust "valve
‘ “ 30 tion
1_ In pipe‘
accordancevwithmy
leadingfroina point
invention‘hin
on‘ the ‘pump
the.suc'-.
below ' ' sphere
_‘.(not1‘fshown)
throughinto
an air
theport
casing
5.‘v 3'> escape
1 to‘fatmose
I " _ 301'
“ “1 *‘thefoilf level' to the exhaust pipeline of)‘ the ‘ ’ The 'motor‘ is supplied with current from' a" R ~
g ' ‘recti?er is, mounted arcombined intake valve ap'é , suitable current source; such as a "single “phase ‘
‘ ‘ paratus and relief'valyie‘apparatus,‘ the ‘combined alternating current source,‘ for“ example, con- 7 '
n5 aipparatusbeing so arrangedand ‘controlled that heated to supply lines‘ 6, the current‘ being con- 35
when the pump is brought to a stop, the intake ‘trolled ‘for starting and running through suitable “
(‘valve is closed and;siinultaneouslygthe rcliefkvalve
(is-‘opened to admit airnlat atmosphericpressure
into the suctionxpipe‘ofthe‘purnp,, h
_
motor t control‘ means indicated ‘ by‘ the‘ ‘rectangle ‘
‘I, ‘the’ control means 'I being connect'eld'to the
v motor by; leads 8 insulated from the'eover 9
'
‘ ‘ 40‘
‘ “ Yi'standls
-* .‘Thjeii'elief
idle,'thereby‘destro‘ying‘the-‘vacuum
valve‘ remains open Whilethe in
pump-{by
the pump‘
bushings'l?.‘
manually a In
switch‘
ordermeans
to start
indicatedébyftlhe
and (stop the 40‘
‘ “pump and pump suction pipe'and' preventing all , numeral‘ II is providedin thesiipplylinesto‘ ‘the
‘possibility'of creeping of‘oil or'oil‘vapor into con-
it
‘ mptor.
_
.
t‘
‘ n
,
v
‘v I
v
v
_
“tact with the intake valve and into the vacuum‘ ‘ " To control the connection of the pump l‘t‘ofthe
‘ 45*1chamber of the recti?er.‘ Upon-restarting of the " exhaust line llwhich is connected to-the'lvacuum 45.
‘
‘pump ‘the vintakeyalve is ‘ held closed‘ and'the ' " chamber (not shown") "of a device‘such as‘la‘n ‘iron 7
l
'
.7
‘relief valyei‘is'held‘openfor apr‘edetermined time. , tank‘ rectifier, vand to control‘the admission of‘v 1 i ' ‘
‘ inter-val ‘to ‘admit-Lair as“ above described to the , airata'tmo‘spheric pressure toi‘the pump,'a'con,—' ‘
j Vpum'p'and pjump'suction pipe." This ‘time interval ‘trol'valve apparatus‘ designated generally by the Y
a ' c 1‘.L50‘
‘ ‘ 1"normalwspeedi'unloaded;
'isis‘u?ieient'to permit the
thereby
pump‘ eliminating
‘to come upthe‘
to 1 “numeral
tion pipe 'l3;-is'
Mandconnected‘between
the exhaust line 12.
the ‘The
pumps-‘sue;
valve 50
' high star-tingtorque encountered‘when‘the pump, apparatus in the‘ present embodiment'of thein-‘i
is required to start‘ against vacuum.‘ The time ‘vention is preferably constituted by a unitary 215- ‘~
‘ a
‘
interval is extended'after‘the pump comes up'ito‘
1‘ “ ‘ t 55 speed, fo'r'suchl'ajperiod that the" pump runsidle
sembly mounted on the‘ cover 9 of‘ the pump cast-4; I '
ing '3 and comprising a main valvemeans ‘l'llfor ' 55
,
'
2
2,124,390
to control the admission of air at atmospheric
through a thermostatic switch 43 having a heater
element 44_, to close contacts 45 in one of the
solenoid leads 38 and simultaneously to short
pressure to the pump.
circuit the heater 44 through contacts 46.
I controlling the connection of the pump I to the
exhaust line I2, and a second valve means I5
_
The main valve means I4 includes the upper
open end of pump suction pipe 4 and a valve disc
10
I6 of rubber or other suitable material mounted
shown in'the drawing, upon closing of the ‘start
in a valve foot I1 which is connected to the lowerv
ing switch II, starting and running current is
end of a valve stem I8.
The valve foot I1 is welded or otherwise fas-'
tened in vacuum-tight relation to the lower end
of a bellows or sylphon valve member I9 which
supplied to motor 2 in a usual manner through
the motor control means, 1. When the pump is 10
started ‘and is up to normal speed, heating cur
rent is supplied to heater 44 of the thermostatic
is provided to give flexibility to the movement
switch 43 through contacts 42 of switch I I.
of the valve stem I8 and to seal off the valve means
The pump 2 now runs idle, since intake valve
“between pump suction pipe 4 and exhaust line 15
I2 is closed, by the atmospheric pressure on the
upper side of valve foot I1, and relief valve I5 is
open permitting air at atmospheric pressure to
enter the upper end or tipv 26 of valve stem I8
and to flow through longitudinal hole 32 of stem 20
I8 and hole 33 of valve foot I1 and valve disc I6
into the pump suction pipe 4 and thence into"
pump I. After a predetermined period of time,
for example 30 seconds, the thermostatic element
of switch 43 operates to short-circuit itself, there 25
15 I4 from atmospheric pressure. The bellows I9,
valve foot I1 with its rubber disc I6, the upper
end of, pump suction pipe 4, and the lower por
V20
~
tion of valve stem I8 are enclosed within a
vacuum-tight casing 20 having a cover member
2|, the upper end of bellows or sylphon member I9
being connected in vacuum-tight relation to cover
A sleeve 22 for guiding the stern I8
member 2|.
projects downwardly from cover 2|.
The second valve means, l5, includes a valve
seat member 23 slidably mounted within a valve
seat casing 24 and having in its lower face a:
valve disc 25 of rubber or other suitable material,
and further includes the upper end or tip 26 of
.the valve stem I3, this upper portion of the stem
being adapted to slide freely in the lower portion
of valve seat casing 24, into and out of contact
with disc 25. The valve ‘seat 23, together with its
rubber disc 25, is biased downwardly toward the
valve tip 26, by ajspring 21 mounted in valve
‘seat casing 24. Downward motion of the slidable
seat 23 is limited by suitable stop means such as
an offset 28 in valve seat casing 24, and upward
motion of seat 23 and its disc 25 is also limited by
a stop means, such as a downwardly extending
40
In operation of the apparatus above described, 7
the various parts being initially in the positions
portion 29 of a‘plug 30 which retains spring 21
. within valve seat casing 24.
To mount the valve seat 23 and its disc 25 of
the valve means I5 in proper alignment ‘with
stem I8 and to provide a support for means to
actuate the valve mechanism, a supporting and
mounting member 3| is provided preferably con
stituted by a casing member so arranged that the
interior of the casingisat atmospheric pressure.
p
by to supply sufficient current'to actuating coil
4| of relay 40 to close the contacts 45. The period
of idle running of the motorv is sufficient to permit
the clearing of all oil or foreign‘gases out of the
pump before normal operation begins.
.
. 30
When contacts 45 are closed by the relay coil
4| at the end of the time interval determined by
thermostatic switch 43, current, is supplied to
solenoid 34 through leads 38; the plunger 35 is
then drawn up thereby lifting the valve stem I8 35
by an amount sufficient to open intake valve I4
by the lifting‘ of rubber disc I6 away from the end
of pipe I4, and simultaneously to close relief valve
I5 by the forcing of tip 26 of valve stem I8 into
contact with rubber disc 25. The upward'motion
of valve stem I8 is preferably such that valve seat
23, carrying disc25, is forced upward against the
pressure of spring 21 into contact with stop 29,
the end of valve stem I8 then preferably continu
ing its upward motion for a short distance to dig
slightly into the rubber disc 25 to insure a vac
uum-tight joint between the disc 25 and the tip
v 26 of the valve stem.
Since, in the above described upward motion
The support or casing 3 | ‘is preferably mounted on
the cover 2| of the vacuum-tight valve casing 20. ' of valve stem I8, the relief valve is caused to close .50
To admit air at atmospheric pressure through and'the 'intake valve I4 is caused to open,_ the
the upper valve means I5 into, the pump suction pump. | is now sealed from atmosphere and is ..
pipe 4 and the pump I, a hole 32 is provided ‘in connected to exhaust line I2 for normal operation
in exhausting the evacuated chamber of the rec-‘
valve stem I8 extending longitudinally there
through and registering with a hole 33 provided in ti?er or other device to which exhaust line I2 is
' valve foot I1 and rubber disc I6 of the lower or
intake valve means i4.
To operate the valve mechanisms I4 and I5 an
electrical actuating means is preferably provided
connected.
,
‘
-
'
'
'
.
,
.
When the pump mechanism is .stopped, as by
the manual opening of switch II, solenoid 34 is‘
deenergizedplunger 35 drops to its lower position
(50 which inthe present embodiment of the inven- . illustrated in the drawing, and valve stem I 8' 60
tion comprises a solenoid 34 having a plunger 35
which is connected as by suitable link, and lever
mechanism, comprising, for example, two links
36 and two levers 31, to valve stem ‘I8, thelevers
(35 31 being pivoted on thesupporting and mounting
member 3|. The solenoid 34 is connected by
leads 38 to the current supply line 6 through a
switch means designated by the numeral 39. Inv
order to delay the actuation of valve means I3
70 by the solenoid 34 for a predetermined time inter
moves downwardly thereby reclosing intake valve
I4 and reopening relief valve I5, the valve seat‘
23 which carries rubber disc 25 being moved‘
down, in contact with the upper end of the valve
‘stem, by the pressure of spring 21 until the valve
seat 23 rests against the stop 28. When the
‘pump is thus stopped and theintake valve I4 is
caused to close, air at atmospheric pressure is _
immediately ‘admitted to the pump suction pipe 4
and pump I through valve I5 as hereinbefore de
0
val after the manual closing of starting switch ’ scribed. Therefore the vacuum existing in these
II, the solenoid switch means 39 comprises a parts of theapparatus is. destroyed and creep
suitable relay such as a relay 40 the actuating coil
4| of which is adapted to be supplied with cur
rent, through contacts 42 of the switch II and
age of oil from casing 3 or from the pump into ’
contact with rubber disc I6 of the intake valve
I4, or creepage of this oil past the valve I4 into 75
.3,
‘the exhaust the n and {thence to‘ thefevacuated ‘_"
control the admission of air at atmospheric pres- _ i
chamber oi» the recti?er DriOtheId2Y10e; is e?ec- a. sure to said'pump through said hollow stemvrandl ’
-
tuallyprevented.
'‘
'
means‘ to operate said two valve'means simul
‘
~
and‘. stopping 1 of the I taneously.
{
3..A
unitary
control
valve
apparatus
adapted
pump» the above described‘ cycle of operations, ‘to be'interposed between an exhaustv line
and
including the period of idlerunning of. themotor
connected to'atmosphereriollow ‘by the closing " a vacuum pump; said valve apparatus comprise ‘
‘ingr v.itjijvalvex stem having a'longitudinal aperture:
‘oil of theivalvebetwee
'
herethrough, an intake valve between the pump‘
- and the opening or ‘the;
' Upon furtherstarting
'
‘a
1
-
i-andithe‘exhaust line including a valve disc G021‘,
fné'cte'd tome and of said valve stem and having
10
‘ My invention-has? ‘
' a I
partici?arembodiment
1
urpose's
. 1 not;
v . illustrae'
~
p
I
I
use.‘ “It is to be understood , ?eifcl‘rthuttl'ijefine
ventlon ;is_' susceptiblev‘ucv yai'ious ‘changesiand
, ‘an aperture therethrougliv registering-withsaid
aperture of said stem, a relief valve open to at
mospherejand comprising the other end vof saidj
‘modi?cations and thkitlb thejappended‘claim's I ‘stem‘and' a ‘valve disc adapted to close said aper- " 1s
>_.intend to coveranyjgsuch; bdl?cations as i’aiiv ture of said stem, and means to move saidlvalve
'iaiothinkthe truef'spirita and acope?iof ,my inven
n
a‘
a
>
,
'
r
.
'
‘u
t 'I'ciaim,as’:,ne'
m
-
v
i
stem'longitudinally to‘actuate said-intake‘ and ‘ 1
‘ relief valves, whereby said control valvelappa-y
anddesire to secm'ty ~ ratus is ‘operable, to connect the pump to the
' v1 _ vniliettersrPatent in the United States is:
'
‘ “
1 ?lm-A control valve apparatus-adapted to be 7
between an exhaust line'and an ex
ha‘ust ‘pump, said 'valve' apparatus. including a
hollow valve stem. valve means at‘ one extremity
‘of said stem'adapted. to open and to close the
path from said‘ exhaust line to saidv pump, and a
exhaust line and simultaneously to disconnect
the pump from‘atmcsphere and operable there- 1
after to disconnect the pump frornvthe exhaust
line and simultaneously to connect the'purnp'tov
atmosphere.
H
I
‘
‘
5
,
e
»
g
"
4. A control valve apparatus adapted to ‘be
interposed between an exhaust line and ,a vac- ~ a
second ‘valve means at ‘thei‘othe'r extremity of u *"uum pump, said '7 valve apparatus comprising a
said stem operable ‘simultaneously with said valve stem, an intake valve between the‘ pump 1: -
and the exhaust line including a valve disc mem
said‘ste'm to said pump from outside‘ said ex-j' j ber connected to an‘end of said stem, said-stem
?rst-named valve means toIadmit air through.
'haust line whensaid tirstrnameduvalve means is
and 'saiddisc member being‘ apertured to per»
named valve means isin open position.
.
2. A control valve, apparatus adapted to be
‘interposed_,,between an exhaust line- and an ex-,
haust pump, said valve apparatus including a
hollow valve stem, a valve casing: ands. valve
‘supporting member, the "interior of said valve
member and surrounding said, end oi‘ said stem.
a vacuum-tight casing surrounding said resilient support, said disc member, and said end
ot'said stem, said casing being connected to
said- exhaust line and to said pump, a relief
valve, a relief valve supporting ‘member,’ said
relief valve comprising the tip-oi’ the other end
of said stemand a valve disc 'slidably mounted
" a in closed position and to exclude air to said pump, ,mit'the passage of air therethrough, a resilient ‘
vacuum-tight support connected to said ,disc ‘
from‘ outside said exhaust line when‘ said ?rst
casing beingxat 'thepres'sure oi’ said line, ‘the
interior of the valve supporting member being
'at atmospheric‘ pressure,‘ .a valve, means in‘ said in said relief valve supporting member, and.‘ »
valve casing at one extremityhoi" said stem'to‘ means to move said valve stem to open saidv-in- >
take valve and simultaneously to close said Irecontrol the conncction'ol-saidipump to said ex
'
a
‘haust line, a valve ‘means at the other extremity lief valve.
of said-stem in said ,valv‘esupporting member to
a
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