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Патент USA US2118843

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ay 31, 1933.
2911 18,43
H. C. GUILD
GAS COMPRESSOR AND CLEARANCE VARYING MEANS THEREFOR
Filed Dec. 16, .1936
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INVENTOR
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Patented May 31, 1938
2,113,343
UNITED STATES
Parent oFFleE
2,118,843
GAS COIHPRESSOR AND CLEARANCE VARY
ING
S THEREFOR
Herbert 0. Guild, New York, N. Y.
Application December 16, 1936, Serial No. 116,143
8 Claims.
(01. 230-41)
My present invention relates to devices for
flow into and out of said pocket. I accomplish
varying the volume of the clearance space in a
this by simple mechanism whereby the valve may
gas compressor, particularly for the purpose of
varying the “capacity” of the compressor, that
5 is, varying the amount (weight) of the com
be held open and a gas-tight chamber formed in
operative relation for in and out flow of the addi-
pressed gas that a given compressor will deliver,
other capacity varying factors remaining the
As applied to the case of a compressor of the
ordinary cylinder and piston type, it may be ex
plained that, other things being equal, the maxi
mum compression actually attained, depends
upon the point in the rearward movements of
_ the piston at which the inlet valve opens, and
upon the point in its forward movement at which
the outlet valve opens.
Usually, both the inlet and outlet valves are
check valves which automatically open and close
according as the reciprocating piston raises or
lowers ‘the internal pressure above or below the
external pressures on the valves.
Consequently,
the normal clearance is usually made as small as
is mechanically practical.
My invention assumes a normal condition, in
cluding predetermined piston speeds; and any of
the permissible external inlet and outlet pres
sures, and any displacement-clearance ratio that
will give internal pressures sufficiently in excess
of the external pressures on the outlet.
For any
30 such normal condition, increasing clearance space
increases the volume of gas that remainscome
While this broad principle may be applied to
elements, the necessary mechanism is simpler,
cheaper and more efficient when applied to check 10
valves, particularly annular plate valves such as
are commonly employed in this art. In ‘such
case simple well known mechanism, including
?ngers extending through the passage or pas
sages for inlet of gas to the valve plates, may be
employed for holding the valve plates open; and
the valve opening mechanism may be operated
interdependently with pocket closing elements.
In so much as the inlet valve cannot be func-v
tioning as such, when the blind pocket is func 20
tioning, it will be obvious that the invention is
particularly useful where two or more separate
valves or valve elements are employed. “In fact,
one of its most practically useful applications is
in connection with compressors wherein as many 25
valves are employed as can be arranged around
the clearance space of the cylinder.
Commonly,
three, four or more intake valves or valve ele
ments are employed for the intake, and a similar
number for the outlet. ,
30
The above and other features of my invention
pressed in the cylinder when the outlet‘valve
closes. This increases the distance the piston
may be more readily understood from the fol
lowing description in connection with the ac
must travel rearward during the suction stroke
companying drawing, in which
before said gas can re-expand to pressure low
enough to cause opening of the inlet valve. This
decreases the amount (weight) of new gas which
can be taken in. In short, other things being
equal, increasing clearance space increases the
amount of idly compressed and re-expanded gas
in the cylinder, thereby decreasing the intake and
output capacity of the compressor.
’
Fig. 1 is a more or less conventional or dia
valves;
Fig. 1, showing an intake valve provided with
of varying the amount of the idly re-expanding
accordance with my present invention; Fig. 2
showing the position of the parts when the intake
valves are functioning, and Fig. 3 the position
has been by adding a de?nite ?xed volume of
rate blind pockets, known as “clearance control
pockets”. As such a pocket must communicate
with the clearance space, a common way of add
ing it to a compressor supplied through two or
more intake check valves, is to substitute the
pocket for one of said valves.
when the valve plates are held inoperative and a
blind pocket space has been closed in above them.
_Figs. 4 and 5 show modi?cations.
In Fig. 1, the clearance space is surrounded by 50
cylinder wall A, in which are openings controlled
by four ordinary annular plate inlet valve as
' One object of my invention is to avoid'necessity
semblies B, B, two of which are shown as equipped
for such substitutions; and to operatively com
bine a gas-tight clearance pocket with at least
with my pocket forming elements C, C. The out
let valve assemblies D, D, are like B, B, except
one of the inlet valve elements, so that a valve
that the valves open outwardly instead of in
passage normally used for the unidirectional sup
ply of gas to the cylinder, may be cut off from
69 the supply and utilized for the ‘idle to and fro
40
Figs. 2 and 3 are detail sections on line 2-2,
valve-opening and pocket-forming elements, in
clearance space, in the form of one or more sepa
35
grammatic View showing a compressor in trans
verse section, taken approximately in the plane
of the clearance space, and showing manifold
passages with a multiplicity of intake and outlet
While there are other more complicated ways
gas, the only simple way, so far as I am aware,
)5)
the thus opened valve passage.
any compressor having two or more inlet valve
same.
i)
tional compressing and expanding gas, through
Wardly.
The cylinder A carries an outer casing E clos
ing in an annular space separated into an intake
2
2,118,843
’ manifold F and an outlet manifold G, by the par
titions H, H.
As shown, the valve assemblies are insertable
through manholes in the outer casing E, which
Cl
are closed by gas-tight cover plates J through
which extend screw thrust members K, K, where
by the valve assemblies are clamped gas-tight in
the openings of cylinder A.
In Fig. 2, the valve assembly B is conventionally
10 indicated as including the usual upper disc I,
adapted to be clamped gas-tight in the opening
through the wall of cylinder A; and a lower disc
2 secured to the upper disc by a screw.
Intake
of gas is through passages 3, 3, in the uper disc,
and passages 3a, 3a, in the lower disc. The low
er surface of the upper disc forms seats for the
ring plate valves 4, each of which is normally
held against its seat by springs 5. These springs
are only strong enough to ensure seating of the
20 valve against a slight pressure differential. Con
sequently, as soon as the piston head is re
tracted far enough to reduce the internal pres
sure below the gas pressure in the supply manifold
minus the spring pressure, the supply pressure
forces the valve plates downward and they re
main open until the piston moves forward again,
and compresses the gas enough to make the in
ternal pressure plus spring pressure exceed the
supply pressure; whereupon the combined up
30 ward pressures close the valve.
10
therewith.
In the position shown in the drawing, the pis
ton 8a. is at the lower limit of its movement, and
the pin I3 is at the upper end of slot I2. When
the piston is withdrawn the spring continues to
push the ?nger and hold the valve 4 open until 15
the piston reaches a su?icient height so that
the pin I3 comes in contact with the bottom of
slot I2, whereupon the valve closes.
In Fig. 5, the construction and operation is
similar except the entire tube I I0 with its slot 20
I2 is located entirely above the piston and the slot
is closed in gas-tight, by sleeve I5, which is
brazed or welded to tube H0, at the top and
bottom of the slot. This gives a much longer
range- of piston movement and the cylindrical 25
part of the cup may be'much higher, giving
greater maximum volume for the clearance
pocket.
_While I have shown and described in detail
a simple and novel construction for closing a
In the ordinary case, this valve assembly is held
pocket, opening the valve and utilizing the Valve
passages as means for increasing the volume of
the clearance space, as applied to a common type
screws K’, K’.
The upper part of tubular member 6 is venti
lated for free inlet of gas, while the lower portion
affords imperforate side walls of the pocket. The
side wall portion of the pocket space is formed
with a valve-like seat 1, adapted to be closed gas
45 tight by plate 8, an edge portion of which accur
ately ?ts the seat ‘I.
This cover plate 8 may be
raised or lowered by any suitable means, such as
screw K.
The means for holding open the valves when
50 this pocket space is closed, is shown as including
?ngers III, which are carried by plate 8, and
which extend through the ordinary gas inlets.
These ?ngers III are of proper length to hold
open the ring valve plates 4, when the ?ngers are
55 moved downward the distance required to seat
the plate 8 and form the closed pocket, as shown
in Fig. 3.
Figs. 4 and 5 show modi?cations, the most im
portant of which is utilizing an adjustable piston
60 in place of cover plate 8 and making the ?ngers
in telescoping sections instead of the integral
?ngers I0. Another optional modi?cation is
making the member 6 that forms the side walls
of the compression space, integral with the top
65 plate I of the valve assembly.
So far as the parts are the same, the reference
70
The valve opening ?nger is in two telescoping
sections including the ?nger proper Illa and the
tube II with which it telescopes. The tube is
provided with a slot I2, in which slides the stop
pin I3 carried by Illa; and in the upper end of
tube II is the spring I4 which is powerful enough
to open the valve whenever Fig. 10a. contacts
down by the thrust of a screw K, as described in
connection with Fig. 1. In the‘ present case,
however, the valve assembly is utilized as the bot~
35 tom of the clearance pocket and is held down by
tubular member 6, which a?ords side walls for
said pocket; and is forced into air-tight engage
ment with the upper surface of said assembly by
40.
able means, which may be a swivelled screw like
K, Fig. 2.
numerals are the same, and where they are simi
lar the same numerals with an exponent are used
as far as possible.
In Fig. 4, the plate I a is integral with the cylin
der member 60. so that the compression chamber
is an integral cup, and it is closed in and opened
by the adjustable piston 8a, which is like cover
78 plate 8, and is vertically adjustable by any suit
of compressor and valve, it will be obvious that
many variations are possible, as for instance, 35
means for rendering the movable valve elements
inoperative, need not be ?ngers, and need not
be carried by or even interdependent with the
operation of the means for closing in the pocket
space. Also the means for closing the pocket 40
space need not be a cover plate, provided the
pocket forming elements comprise at least two
relatively movable members that are capable of
adjustment for closing a pocket and cutting off
the gas supply in one position; and for leaving 45
a free gas supply inlet, in another position. Also
the principle may be useful Where the movable
valve elements are not plate valves and are not
even check valves. Also the volume of the pocket
may be varied to suit the compressor. Also while 50
I have shown a valve assembly in which there
are two separate ring plate valve elements, this
is not essential, and where there are two valve
elements as shown, only one of them need be
opened and its passages closed in by a pocket. 55
As before indicated, it is not necessary or
desirable to equip all of the intake valves with
the pocket forming mechanism because pocket
ing all of them would cut oif the gas supply com
pletely. In Fig. 1, where there are four intake 60
valves, only two of them are shown as equipped
with pockets; but obviously the volume of clear
ance space may be more widely varied by hav
ing three valves so equipped; and one only may
be sufficient for certain purposes. The pockets 65
need not all be of the same volume or of the same
mechanical construction.
I claim:
1. A gas compressor having a gas intake mani
fold formed with several intake openings com
municating with a clearance space in the cyl
inder, corresponding exterior openings with 010
sures therefor, and check valve assemblies in
sertable and removable through said exterior
openings and each adapted to be ?tted gas-tight
70
2,118,843
in one of said openings into the clearance space,
each assembly including a plurality of inwardly
opening ring plate check valves; and, in com
bination with said parts, means for holding open
one or more of said valve plates, and closing
in a clearance pocket in reciprocal ?ow relation
to said valve; said means including a tubular
pocket-forming member in said manifold hav
ing one end adapted to ?t gas-tight against the
intake face of the valve assembly, screw means
carried by the external closure and applying
openings communicating with a clearance space
in the cylinder, check valve assemblies) each
adapted to be ?tted gas-tight in one of said
openings, each assembly including at least one
inwardly opening check valve; and, in combina
tion with said parts, means for holding open a
valve of one or more of said assemblies and clos
ing in a clearance pocket in reciprocal ?ow rela
tion thereto; said means including a tubular
pocket-forming member having one end adapted
to ?t gas-tight against the intake face of the
downward thrust upon said tubular member to
valve assembly, screw means for applying down
force the valve assembly into gas-tight ?t with
ward thrust upon said tubular member to force
the valve assembly into gas-tight ?t with its
its opening into the clearance space; a closure
member for said tubular member and externally
operable screw means for adjusting it in gas»
tight engagement with said tubular member to
form a gas-tight pocket; and for retracting it;
and ?ngers carried by said pocket closing mem
20 ber, extending through the gas inlets of said
valve assembly and of proper length for engag
ing and holding open the ring plate valves when
said closure is in gas-tight engagement with
said tubular pocket forming member.
2. A gas compressor having a gas intake mani
fold and at least two separate openings there
from into a clearance space of the compression
cylinder, removable check valve assemblies each
adapted to be ?tted gas-tight in one of said
30 openings, each assembly having at least one inlet
passage controlled by an inlet check valve ele
ment, and at least one of said valved passages
of one of said assemblies being maintained con
tinuously operative for intake supply of gas to
35 said space; and, in combination with said parts,
means for holding open the check valve ele
ment of at least one other of said inlet passages
to permit alternating ?ow of gas to and from
the clearance space through the thus opened
40 passage; a hollow member within the intake
manifold, adapted to form side walls of a clear
ance pocket communicating through said open
passage with the interior of the compression
cylinder; means for applying inward thrust to
45 said hollow member to force it against the as
sembly containing said open passage, and there
by force said assembly into gas-tight ?t in its
opening; and means for completing the clear
ance pocket, including means for closing said
50
3
hollow member gas-tight, completely cutting off
the open passage from gas in the supply mani~
fold and ail‘ording a gas-tight space con?ning
said alternating ?ow of gas, thereby aifording
additional ?xed-volume clearance space for the
compressor.
3. A gas compressor having a cylinder clear
ance space supplied with gas from the source
through at least two independent passages each
controlled by a separate inlet check valve ele
ment; at least one of said valve elements being
maintained continuously operative for intake
supply of gas to said space; and, in combination
with said parts, means for holding open at least
one other of said valve elements to permit alter
65 nating flow to and from the clearance space
opening into the clearance space; a closure mem
her and externally operable screw means for ad
15
justing it in gas-tight engagement with said
tubular member to form a gas-tight pocket; and
for retracting it; and ?ngers carried by said
pocket closing member, extending through the air
inlets of said valve assembly and of proper length
for engaging and-holding open the valves when
said closure is in gas-tight engagement with said
tubular pocket forming member.
5. A gas compressor having at least two intake
openings communicating with a clearance space
in the cylinder, check valve assemblies each
adapted to be ?tted gas-tight in one of said
‘openings, each assembly including at least one
inwardly opening check valve; and, in combina 30
tion with said parts, means for holding open a
valve of one or more of said assemblies and closing
'in a clearance pocket in reciprocal ?ow relation
thereto; said means including a tubular pocket
forming member having its outlet end integral
with the intake face of the valve assembly, screw
means for applying downward thrust upon said
tubular member to force the valve assembly into
gas-tight ?t with its opening into the clearance
space; a closure member and externally operable 40
screw means for adjusting it in gas-tight engage
ment with said tubular member to form a gas
tight pocket; and for retracting it; and ?ngers
carried by said pocket closing member, extending
through the air inlets of said valve assembly and
of proper length for engaging and holding open
45
the valves when said closure is in gas-tight en
gagement with said tubular pocket forming
member.
6. The combination speci?ed in claim 5', with
the further features that the closure member for 50
the pocket is a piston slidable in said tubular
member and the ?ngers for holding open the
valves are endwise slidable and spring pressed
to hold the valve open in any of the positions to
55
which the piston is adjustable.
7. The combination speci?ed in claim 3, with
the further feature that the means for forming
the gas-tight chamber includes a cylinder and a
piston adjustable therein; and the means for 60
holding open the valve elements includes valve
opening elements operable to hold the valve ele
ments open when the piston is in any of the
desired pocket-closing positions.
8. The combination speci?ed in claim 3, with 65
through the thus opened passage; and means
for forming a gas-tight chamber, completely cut
the further feature that the means for forming
the gas-tight chamber includes a cylinder and a
ting oif supply of gas from the source and at
fording an added volume gas-tight space con
piston adjustable therein; and the means for
holding open the valve elements includes ?ngers
that are endwise slidable and are spring pressed
to hold the valve elements open when the piston 70
is in any of the desired pocket-closing positions.
HERBERT C. GUILD.
70 ?ning said alternating ?ow of gas, thereby af
fording additional clearance space for the com
pressor.
‘l. A gas compressor having at least two intake
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