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Патент USA US3019818

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Feb. 6, 1962
H, N. lPsEN ET AL
3,019,809
COMBINED VACUUM VALVE AND COLD TRAP
Filed Sept. 13, 1960
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Feb 6, 1962
H, N. lPsEN ET AL
3,019,809
COMBINED VACUUM VALVE AND COLD TRAP
Filed Sept. 13, 1960
2 Sheets-Sheet 2
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. . Patented Feb. 6, 1%62
2
1
the illustrated form of the invention, the shoulder is
3,019,809
COMBENED VACUUM VALVE AND COLD TRAP
Harold N. ipsen and Karl H. Seelandt, Rockford, lll., as
signors to lpsen Industries, Inc., Rockford, lll., a cor
poration of illinois
Filed Sept. 13, 1960, Ser. No. 55,45%
7 Claims. (Cl. 137-340)
made as a flange integral with the lower end of the in
termediate portion and the outlet 12, which is made
separately, is secured to the underside of the flange by
screws 15, the two parts beingY sealed by an O-ring 16.
A valve disk 17 disposed within the intermediate por
tion 13 seats against the upper side ofthe flange 14
whereby the disk and the flange constitute the vacuum
This invention relates to a system for evacuating a
chamber such as the interior of a heat treating furnace
and, more particularly, to a system which uses both a
mechanical pump and an oil diffusion vapor pump. The
In the present instance, the valve disk is conically
shaped with a recessed sealing ring 18 extending around
its periphery to engage the shoulder 14. Supporting
latter, by issuing jet streams of oil vapor, impel the air
the disk for movement toward and away from the shoul
der is a vertical rod 19 pinned at its lower end to the
molecules away from the chamber being evacuated and
thereby aids the mechanical pump. In such a system,
a cold trap is disposed ahead of the diffusion pump to
condense oil vapor which may backstream and other
vapors which may be in the chamber. Also interposed
valve.
'
f disk. 'The upper end ofthe rod projects through a bush
ing 20 which projects through a cover 21., and is fastened
to the latter byv screws V22. The cover closes the upper
end of the body 10 and is secured in place by screws
23 which are threaded into an annular flange 24 ex’
between the pumps and the chamber is a vacuum valve
which is closed to maintain the vacuum in the chamber. 20 tending around the interior of the body. Sealing rings
One object of the invention is to combine a vacuum
valve and a cold trap in a novel manner so as to pro
25, 26 and 27 seal the cover 21, the bushing 20 and the
rod 19 `respectively.
'
' With the intermediate portion 13 of the body 10 being
larger than the outlet portion 12, there is a space sur
constructed as a unitary assembly.
Other objects and advantages of the invention will 25 rounding the valve disk 17. An annular baille 28 is
disposed in this space and provides surfaces on which
become apparent from the following detailed description
the various vapors may condense. While the baille may
taken in connection with the accompanying drawings, in
take various forms, herein it is a corrugated ring of sheet
which:
metal as illustrated most clearly in FIG. 3. Between
FIGURE 1 is a fragmentary sectional view taken
along the axis -of a combined vacuum valve and cold 30 corrugations, the baille is flattened as indicated at 29
Where it is welded or otherwise secured to the wall of
trap embodying the novel features of the present inven
vide a comparatively simple and compact arrangement
tion.
the intermediate portion 13. The baille is open at both
ends so that air may flow both inside and outside the
FIG. 2 is a view similar to FIG. l but shows the parts
corrugations.
in a different position.
35
To insure that all vapors strike a surface upon which
FIG. 3 is a sectional view taken along the line 3_3
they may condense, a thin annulus 30 of sheet metal is
in FIG. l, parts being broken away and shown in section.
secured to the intermediate portion 13 of the body 10
above the baille 28 and forms a flange which projects
in far enough to overlie the periphery of the valve disk
v Fig. 5 is a fragmentary view of a modified form of
40 17. With this arrangement, the air and vapors being
the invention.
evacuated follow the circuitous path illustrated by the
For purposes of illustration, the invention is shown in
-FIG. 4 is a Schematic View of the combined vacuum
valve and cold trap. Y
arrows in FIG. 2, that is, the vapors are deflected out
toward the baffle and strike either the baille or the shoul
and cold’ trap which may be used in evacuating a cham~
der 14. Similarly, any oil vapors which may backstream
ber (not shown) such as the interior of a heat treating
furnace and which includes a hollow body 1t). Herein, 45 are deflected out to strike the baille or the underside of
the annulus 30 as illustrated by the arrows in FIG. 4.
the latter is L-shaped to provide an inlet portion 11 com
Means is provided to cool the body 10 and particu
municating with the chamber to be evacuated and an
larly the baille 2.8, the annulus 30 and the shoulder 14
outlet portion 12 with the main or intermediate portion
to reduce the temperature of these parts to a point below
13 between the inlet and outlet. The outlet is connected
to a pumping apparatus (not shown) which conven 50 the deW point of the vapors which are likely to be en
countered and thereby insure the condensation of all
tionally includes both a mechanical pump and an oil díf
vapors which flow into the baille. Herein, this means
fusion vapor pump.
comprises a tube 31 wrapped around the body and car- .
In vacuum systems such as this, it is necessary to have
rying a cooling agent such as` water or liquid nitrogen.
a valve which closes olf the chamber after the evacua
the drawings as embodied in a combined vacuum valve
tion is complete. Also, a so-called cold trap is placed
If further cooling of the baille 28 is required, an addi
tional coil 32 may be disposed within the corrugations
between the diifusion pump and the chamber to prevent
of the baille as shown in FIG. 5. As the vapors con
oil vapors from backstreaming into the chamber and to
dense, they lun down the baille, onto the shoulder 14
collect condensable vapors which may be present in the
and into the outlet 12, the shoulder 14 being inclined
chamber.
The present invention contemplates a simplified con 60 slightly adjacent the wall of the body as indicated at
32 to prevent the condensates from collecting on the
struction in which the vacuum valve and the cold trap
shoulder.
are combined into a unitary and compact assembly. For
The various areas of the passages are correlated so as
this purpose, the cold trap is arranged in a novel man
not to restrict the passage of air during the evacuating
ner to surround the valve and t'o condense the oil va
operation. Thus, the diameters a (FIG. 4) of the inlet
pors and other vapors as the air carrying them passes
11 and outlet 12 are the same to provide equal cross
through the valve. Both the valve and the cold trap
sectional areas. Also, the cross sectional area of the
are disposed in the intermediate portion 13 of the body
annular space around the valve disk'17 is substantially
10.
To achieve the foregoing, the intermediate portion 13 70 the same as the areas of the inlet and outlet.
of the body is made larger than the outlet portion 12
to provide an annular shoulder 14 between the two. In
It will be observed that the present invention provides
both a vacuum valve and a cold trap in a unitary as
sorgono
d
larger in diameter than the outlet portion to provide an
annular shoulder extending around the end of the outlet
portion, a valve disk disposed within said intermediate
sembly. Both occupy substantially the same space and
the overall construction is relatively simple as compared
with prior arrangements in which the valve and the cold
trap were made as separate elements.
portion to seat against said shoulder and having a diameter
larger than the diameter of said outlet portion and smaller
We claim as our invention:
than the diameter of said intermediate portion, an annulus
1. A combined cold trap and vacuum valve compris
ing a hollow body having a tubular inlet portion, a tubu
axiaily spaced from said shoulder and extending around
said intermediate portion to overhang the periphery of
lar outlet portion and a tubular intermediate portion
disposed between said inlet and outlet portions, said
said disk, means supporting said disk for movement to
intermediate portion being coaxial with said outlet por
ward and away irom'said shoulder, an annular bañie dis
posed between said shoulder and said annulus and dis
tion and being larger in diameter than the outlet por
tion to provide an annular shoulder extending around
the end of the outlet portion, a valve disk disposed
within said intermediate portion to seat against said
posed in the space surrounding said disk, said baffle being
formed with a series of longitudinal corrugations, and
means for cooling said barde, said shoulder and said an-`
nulus.
4. A combined cold trap and vacuum valve comprising
a hoilow body having a tubular inlet portion, a tubuiar
shoulder and having. a diameter larger than tlrediameter
of said outlet portion and smaller than the diameter of
said intermediate portion, an annulus axially spaced from
said shoulder and extending around said intermediate por
tion to overhang the periphery of said disk, means vsup-`
outlet portion and a tubular intermediate portion disposed
between said inlet and outlet portions, said intermediate
portion being coaxial with said outlet portion and being
larger in gross sectional area than the outlet portion to
porting said disk for movement toward and away from
said shoulder, an annular ba-iiie disposed between Vsaid
shoulder and said annulus and Idisposed in the space ,surf
rounding said disk, and means for cooling said batlie,
said shoulder and said annulus,
provide a shoulder extending around the end of the out
let portion, a valve disk larger than said outlet portion
and smaller than said intermediate portion and disposed
.
2. A combined cold trap and vacuum valve compris. 25 within said intermediate portion to seat against said
shoulder, means supporting said disk for movement to
ing a hollow body having a tubular inlet portion, a tubu
ward and away from said shoulder, a flange extending
lar outlet portion and a tubular intermediate portion
around said intermediate portion and axially spaced from
disposed between said inlet and outlet portions, said in
said shoulder, said flange projecting in over the periphery
termediate portion being coaxial with said outlet por
said disk, a baiiie disposed between said flange and said
tion and being larger in diameter >than the outlet por 30 of
shoulder and `encircling said disk, and means for cooling
tion to provide an annular shoulder extending around
said bafñe.
.
the end of the outlet portion, a valve disk disposed
5. A combined cold trap and vacuum valve as deñned
within said intermediate portion to seat against said shoul
in claim 4 in which said cooling means comprises a tube
der and having a diameter larger thanfthe diameter of
coiled around said intermediate portion and adapted to
said outlet portion and smaller than the diameter of said 35 carry a cooling agent.
intermediate portion, an annulus axially spaced- from said
6. A combined cold trap kand vacuum valve as defined
shoulder and extending around said intermediate portion
in claim 4 in which said cooling means comprises a tube
to overhang the periphery of said disk, means support
extending around and in contact with said bañie and
ing said disk for movement toward and away from `said
,
40 adapted to carry a cooling agent.
shoulder, an annular baffle disposed >between said shoul
‘7. A combined cold trap and vacuum valve as defined
der and said annulus and disposed in the space surroundf
in claim 4 in which said bathe is formed with a series of
ing said disk, the crossl sectional areas of said inlet and
longitudinal corrugations and in ywhich said cooling means
outlet portions being substantially equal to, each other
comprises a tube projecting through said corrugations
and to the cross sectional area of the> space surrounding
said disk, and means for cooling said bañie, said shoul
to. Ul and adapted to carry a cooling agent. '
der and said annulus.
3. A.v combinedcold trap and vacuum valve comprising
a hollow body having a tubular inlet portion, a tubular
outlet portion andV a tubular intermediate portion disposed
between said inlet and outlet portions,l said intermediate 5 O
portion being coaxial with said outlet portion and being
References Cited in the ñle of this patent
UNITED STATES PATENTS
2,575,875
Johnson ___._._____..`__-__ Nov. 20, 1951
2,646,065
Tyson _» _____ _., ____ _.Y.._.. July 21, 1953
2,852,035
Holle __, ____ __v__.____-..,- Sept. 16, 1958
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