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Патент USA US2136098

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Nov. 8, 1938.
Filed July 28, 1957
15 Sheets-Sheet 1
L z'ndsay H Browne.
Nov. 89 31938,
Filed. July 28, 1957
5 Sheets-Sheet 2
‘ ‘511/
Y Llkwisa’ filfé’msgma.
Nov. 8, 1938.
I. |-_|. BROWNE
Filed July 28, 1937
3 Sheets-Sheet 3
Lindsayli?rowne. '
Patented Nov. 8, 1938
Lindsay H. Browne, Pittsi’ord,
Y., assignor to
Kellogg Compressor and Manufacturing‘ Cor
poration, a corporation of New York .
Application July 28, 1937, Serial No. 156,075
'1' Claims. (Cl. 230-58)
This invention relates to improvements in air
compressing apparatus.
An object of the invention is to provide an
improved air compression unit including com5 pressor, motor, storage tank and accessories.
Another object is to provide a unit of the
above nature which is quiet and smooth and
ef?cient in operation.
A further object is to provide a~unit of the
10 above type in which the motor and compressor
are supported on the tank by vibration absorbing
Figure 17 isavertical fragmental sectional view
of the ?rst stage suction and discharge valve
structures and mounting taken on the line i1-l1, 5
Figure 12.
Referring to Figure 1, the numeral 20 indi
cates a storage tank provided with feet 2| and
pressure gage 22. Brackets 23 welded to the tank
20 have secured thereto resilient mounting pads 10
24, preferably of the structure shown in detail
means eliminating all metallic connections be-
in Figures 3 and 4-
tween the elements.
Still another purpose is to provide improved
Referring to the latter ?gures, the pad 24
consists of a cupped metallic mounting plate 25,
15 discharge means for delivering the compressed
air into the storage tank by which noise due to
drumming or, pulsation of the discharge is elimi-
nated, and by which any leakage from the valve
outside the tank is rendered impossible.
' 20
Figure 16 is a detail view of the valve plate;
a rubber body 26 secured into and extending 15
above the plate 25, and a central bolting cup 21
of metal secured in the body 26 and resiliently
separated thereby from the mounting plate. The
plate 25 and cup 21 are preferably made of
Another purpose is the provision of a unit in-
stampings provided with tongues 28 and 29 em— 20
cluding a compound compressor having improved
head and valve structure, and in which the
crankcase is sealed from the outer air.
A still further object is to provide improved
25 means to cool the air between stages and before
bedded in the rubber body 26, the entire assembly
being permanently Vulcanized together- The
mounting plate 25 has lugs 30 provided with
holes 3| through which the Dad is bolted to the
brackets 23, Figure 1, and'central holes 32 in 25
delivery to the storage tank.
Other objects and advantages of the invention
will become evident during the course of the fol-
lowing description in connection with the ac30 companying drawings, in whichFigure 1_ is a perspective view of a preferred
form of the invention;
Figure 2 is an exterior detail view of the
the bolting cups 21 accommodate bolts 33, Figure
1, by means of which a frame or base 34 is secured
to the pads.
From the foregoing it Will be Seen that the
base 34 and tank 20, while ?rmly connected, are 30
resiliently insulated from each other by the
pads 24.
Secured on the base 34 is a compressor 35.
resilient discharge connecting device;
Figure 3 is a plan view of a preferred form
of resilient mounting device;
Figure 4 is a vertical sectional view of the,
preferably of the two-Stage type, and a Suitable
driving motor 36. The compressor 35 has atriple 35
grooved ?ywheel 31 acting as a pulley and driven
through three v-belts 38 from the motor pulley
Figure 5 is a longitudinal sectional view of one
40 form of the discharge check valve;
39. The spokes 40 of the ?ywheel 31 are formed
as fen-vanes, Which When in ‘motion provide a
blast of cooling air as hereinafter set forth.
‘ 40
Figure 6 is an end elevation of the same;
Figure 7 is a side elevation of the same;
' Figure 8 is a longitudinal sectional view of an
alternative form of discharge check valve;
Figure 9 is an end elevation of the Same;
Figure 10 is a detail view of the discharge check
valve disc shown in Figure 8;
Figure 11 is a detail view of the spring retainer
for the same;
Figure 12 is a horizontal sectional view of the
cylinder head;
Figure 13 is a bottom view of the same;
Figure 14 is a detail view of the valve seat ring;
Figure 15 is a similar view of the valve re55 tainer ring;
The Compressor 35 is equipped with a head 4|
Ofa type Shown in detail in Figures 12, 13 and. 1'7,
the head being belted t0 the cylinder block 42,
Figure 1- The block 42 has e low Pressure 01‘ first
stage cylinder 43 and a high pressure cylinder 45
44, the lines 011 Which the inner circumferences
of these cylinders register with the headv 4i
being indicated by dotted and dashed lines 45 and
46 respectively on the bottom view of the head,
Figure 13-
A suction or inlet elbow 41, Figures 12 and 13,
preferably integral with the head‘ 4|, leads into
an inlet pocket 48. Two valves 49 and 50, con
structed in a manner hereinafter described, per
mit the passage of air from the pocket 48 to the 55
?rst stage cylinder 4i. A second pair of valves
5| and 52 permit discharge of air from the cylin
der 4| to a second pocket 53, from which a con
nector elbow 54, Figures 1 and 12, conducts the
air to a ?nned tube 55. The tube 55 is formed
in a loop disposed in position to receive a blast
of cooling air from the fan-blade spokes 40 0f the
?ywheel 31, and leads through a second elbow
?tting 56, Figure 12, into the inlet pocket 51
10 of the second or high pressure stage of the com
The ?nned tube 55, so disposed as to
receive the cooling blast from the ?ywheel, this
together with the extreme lightness and resilience .
of the valve plate, results in very quiet valve ac
tion and low resistance to the passage of air,
which advantages are further augmented by the
use of the two identical inlet valve assemblies 48 UK
and 50 to divide the total volume drawn into
the compressor.
The discharge valve assembly 5| is identical
with the inlet valve assembly 49 described above
except that the entire assembly is inverted, the
head or spider end of the cup 63 being screwed
against the shoulder 13 and the seat ring 62 be
operates as an inter-cooler between stages of the coming the locking member. The operation of
compressor to dissipate heat of compression from the valve is the same as described except, of course,
15 the ?rst stage.
‘ that it permits discharge of air from the ?rst
From the pocket 51 a valve 58, of construction stage cylinder 43 to the inlet pocket 51 of the high 15
identical with that of valves 49 and 50, admits the pressure cylinder.
air to the high pressure cylinder 44 from which
The inlet and outlet valves 58 and 59 of the
after compression it is discharged through a valve second or high pressure stage are identical in
20 59 and pocket 68 to a discharge tube 6| herein
structure with those described. Thus all valves 20
after described.
are interchangeable, a condition highly ad
All the valves noted above are of identical con
vantageous both from the view-points of manu
struction, ‘consisting of parts shown in detail in ‘ facture and service. The simple and compact
Figures 14, 15, 16 and 17. These parts consist standardized valve structure allows great ?exi
25 of a seat-ring 62, a guide cup 63, a valve plate bility in design of the compressor for different
64 and a conical compression spring 65.
sizes and capacities, as the valves may be dis
The seat-ring 62 has a ?at annular seat por
posed singly or in multiple in any desired combina
tion 66 raised slightly above the outer rim of the
ring and above a central depression 61, the seat
30 portion 66 being pierced by a plurality of arcuate
slots 68.
The guide cup 63 consists of a short cylindrical
barrel 69 formed integrally with a ?at perforated
head or spider ‘I0. Both the seat ring 62 and
35 guide cup 63 are threaded on their peripheries.
The valve plate 64 is of thin resilient steel, and
is hexagonal in shape in rounded corners ‘H and a
central hole 12.
Figure 17 shows in sectional detail the manner
40 in which two identical sets of the above parts are
disposed in the head 4| to form inlet valve as
sembly 49 and discharge valve assembly 5|.
Referring ?rst to the inlet valve assembly 5|,
Figure 17, it will be seen that the seat ring is
45 screwed against a shoulder 18 at the upper end of
tion. To widen the ?eld of capacities for which
the compressors are designed, a second standard
ized valve assembly may be provided, identical 30
in structure with that described above, but of
smaller size, and in some cases assemblies of both
sizes may be embodied in one compressor in order
to achieve the most advantageous spacing,
grouping and capacity of valves.
The discharge tube 6|, previously referred to, is
composed of ‘externally ?nned tubing. It is
formed in a loop encircling the shaft of the com
pressor in the zone of air blast from the ?ywheel
fan spokes 40 as shown in Figure 1. ‘The tube 6|
thus constitutes an after-cooler giving up heat of 40
compression to the ?ywheel air-blast in the same
manner that the loop 55 operates as an inter
The discharge tube 6| terminates in a union 11
to which is secured a length of resilient hose or 45
tube 18, Figures 1 and 2, preferably of a re
inforced synthetic rubber construction. The
a threaded hole 14 leading from the lower face
of the head 4| to the pocket 48, the annular seat
portion 66 being directed downwardly. ‘The thin
valve plate 64 is held against the seat 66 by the . other end of the resilient section 18 is secured to
spring 65, covering the arcuate slots 68. a threaded connector 18 which is screwed tightly
The guide cup 68 is screwed into the threaded hole into the inlet end 80 of a-check valve assembly 8|
14, the end of the cylindrical barrel 68 tightly en
shown in detail in Figures 8, 9, 10 and 11.
gaging the rim of the seat-ring 62 and locking
Referring to Figure 8, it will be seen that the
both parts in place. The rounded corners of the check valve unit 8| has a body 82 into which is
65 valve plate 64 ?t loosely inside the barrel 6! which threaded a cap 83 formed with a constricted cen
thus serves to guide the valve plate, the spider tral 'nozzle 84 and enclosing a cylindrical chamber
10 serving to hold- the spring 65 in compression 85. A resilient seat ring 86, of rubber or the like,
against the valve plate to urge the latter against is ?tted into an annular recess in the body 82, a
its seat 66.
thin cylindrical inner wall 8'! of the latter extend
The end of the barrel 68 is bevelled at 15 and ing substantially through the rubber ring so that
the shoulder 18 may be grooved or undercut at the latter is rigidly supported against distortion,
‘I6, thereby providing narrow circles of contact be on its inside as well as on its outside circumfer
tween the mating parts and permitting air-tight ence. A valve disc 88 has a raised annular por
joints without the use of gaskets.
tion 88 engaging the seat ring midway between
When by descent of the piston in the compressor > the latter’s inner and outer circumferences.
cylinder 43 a partial vacuum is created therein Small radial projections 98 on the valve disc serve
below the head 4|, the preponderance of pressure to guide the disc loosely in the bore of the chamber
in the inlet pocket 48 acts through the arcuate 85 and thereby ensure proper concentric engage
slots 68 to press the valve plate 64 downward from ment of the disc and seat.
70 its seat 66 allowing air to pass through the spider
The valve disc 88 is urged against the seat ring
10 and into the cylinder. In its passage the air
passes around the hexagonal periphery of the
valve plate and also through the central hole 12,
giving a relatively large area of inlet opening with
15 very small motion of the valve plate. This fact,
86 by a compression spring 9| guided on a tapered
spud 92 secured in a cross member 93 which spans
the chamber 85 and presses against a shoulder 84,
Figure 8. A short cushioning spring 85, secured
in a recess 96 in the spud 92, serves as a resilient 75
stop to limit the opening motion ‘of the valve
disc 88.
bow 41. A combined inlet muiller and air ?lter
II4, secured to the end of elbow 41, silences and
The body 82 is provided withan exterior tapered
thread 85 which is screwed into a suitable ?tting
86 in the top of the tank 20, Figure 1. Thus,
the entire valve mechanism projects inside the
tank 20, and there are no exterior joints in the
check valve assembly through which leakage
might occur to the outer air.
In operation, the chamber 85 and restricted
nozzle 84, both located inside the tank 20, act as
a a muffler for discharge of compressed air into
the tank. Any pulsations of air through the
valve are equalized in the chamber 50 so that
15 the discharge of the air through the nozzle 84
occurs smoothly and at a practically constant
rate. By this means “drumming” or audible vi
bration of the air discharge into the, tank is
eliminated. The motion of the. valve disc 88
20 takes place entirely between resilient limiting
means, that is, between the rubber seat ring 86
and the stop spring 95, so that no clicking or
hammering can arise at this point. The com
bination of this valve action and the elimina
25 tion of pressure pulsations as described above
results in a substantially silent air discharge into
?lters all inlet air drawn into the compressor.
The connection of the pipe II2 as described al
lows the crank case to be sealed from the outer
air, all “breathing” taking place with ?ltered
air from the muiiied inlet passage. Contami
nation of the crank case lubricant with dust and
dirt is thereby avoided, and the “panting” sound
common to open breathers’i'iiis entirely elimi 10
From the foregoing description it will be seen
that the cooperation of the features of the in
vention set forth throughout cooperate to pro
duce a silent and e?icient compressing unit. 15
Pneumatic noises are eliminated by the inlet
mu?ier, internal breather, light and efficient
compressor valves, and the combined check valve
and discharge muf?er structure, while the resil
ient connection of the compressing mechanism 20
to the tank 20 by means of the pads 24 and the
the tank 20. '
The contact of the valve disc with the mid
dle portion of the face of the rubber seat 86,
30 and the latter’s rigid support, as previously set
forth, resulting in long seat life and sustained
tightness‘ of the valve.
A tapped hole 81 in the valve body 82 near
its inlet end 80 is provided to permit connection
35 by means of a smallv ?exible tube 98, Figure 1,
to a combined pressure switch and magnetic un
loader 89 mounted on the base 34 behind the
motor 36. The structures of such pressure
switches and unloaders are well known to those
40 skilled in the art and therefore are not described
herein, their functions being to break the motor
circuit when the pressure in the discharge line
rises to a predetermined point and at the same‘
time to exhaust the discharge line to the atmos
phere through the tube 98, ‘so that restarting of
g the compressor occurs only against atmospheric
?exible discharge coupling 18 prevents trans
mission of any mechanical or electrical vibra
tions to the tank and its foundation.
The location of the ?nned inter-cooler 55 and 25
after-cooler 6| in the air-blast of the ?ywheel
31 contribute to the quietness of the machine by
eliminating auxiliary fans, and the shape and
large cooling surface of these members exposed
to the air blast, in cooperation with extensive 30
cooling ?ns II5 on the cylinder head 4I, provide
thorough dissipation of the heat of compression
prior to delivery of air to the storage tank 20.
While the invention has been described in pre
ferred form, it is not limited to the precise struc
tures set forth, as various modi?cations may be
made without departing from the scope of the
appended claims.
What is claimed is:
1. In an air compression device, in combina
tion, a storageltank, a plurality of resilient pads
secured to said tank, a compressor base mounted
on said pads and secured thereto, a com
pressor on said base, a motor on said base
and connected to said compressor to drive the 45
same, a discharge line on said compressor, a dis
charge check valve within said tank, means in
cluding a resilient tubular coupling joining said
With small compressors an alternative form discharge line to said check valve, and control
of check valve unit shown in Figures 5 and 6 means includingvmeans to release the pressure
may be used, in which the body I00 is construct
50 ed at IOI for a tubing union connection. The from said discharge. line and resilient coupling.
The combination claimed in claim 1 where
cap I02 encloses the equalizing chamber I03 in in 2.said
control means includes means on said
which is guided a light disc valve I04 and its base and responsive to pneumatic pressure to
compression spring I05. The cap I02 has an ex
control the operation of said motor and com
terior annular stepped groove I00 from which pressor, and a resilient tube adapted to trans
a hole I01 leads into the chamber I05. A re- ‘ mit discharge pressure from the inlet side of
silient metal clip I08 is sprung into the outer said check valve to said control means.
step of the groove I06, leaving a slotted opening
3. In a device of the character described, in
I08 disposed circumferentially opposite to the
60 hole I01.
In operation, the alternative valve unit func
tions .in substantially the same manner as pre-
viously described. Some of the air from the '
equalizing chamber I03 escapes directly through
combination, a storage tank, a compressor re
siliently mounted thereon, a discharge line on
said compressor, a check valve in said storage
tank, a resilient coupling connecting said dis
charge line to said check valve, and resiliently
a small hole IIO, but the major portion is forced . connected means to unload pressure from said
and coupling.
to pass out the hole I01, thence around the line
4., In a device of the character described, a
annular passage formed by the groove I05, and compressor
having a closed crank-case, an inlet
?nally out at the slot I08. By the restriction pipe, means attached to said inletpipe to silence
and labyrinthine passage of the air from cham
ber I03, pulsations and drumming are eliminated the intake of air to said pipe and to ?lter said
air, and a breather pipe leading from said crank
as previously set forth.
case into said inlet pipe between said means and
The crank case III of the compressor 35, Fig
ure 1, is not provided with the usual atmospheric
5. In a device of the character described, an
breather, but instead a pipe II2 leads from the
air compressor having a. discharge line and "
crank case to a tapped boss H3 in the inlet el
means to unload pressure from the same, a stor
age tank, and a check valve unit connected to
said line and secured to said tank in sealing
relation, said unit comprising an elongated body
projecting into said tank, a check valve in said
body within said tank, and means in said tank
to retain said valve in said body.
6. In a device of the character described, a. dis
charge check valve unit comprising a body having
10 an inlet passage therethrough, a closure cap on
said body and forming therewith an enlarged ex
pansion chamber at the inner end of said pas
sage, said cap having a constricted outlet there
through, a resilient seat ring in said body sur
15 rounding the entry of said passage to said cham—"
ber, a valve disk guided in said chamber, and a
spring urging said disk against said seat ring, said
cap having a circumferential groove with stepped
sides and a hole connecting said groove with said
20 chamber, and including a snap ring disposed in
the outer step of said circumferential groove, said
snap ring having a slot spaced circumferentially
from said hole whereby an exit from said cham-'
her is provided through said hole, around the
inner step of said groove and through said slot.
'7. In an air compression device, in combina-‘ 5
tion, a storage tank, a plurality of resilient pads
secured to said tank, a compressor base mounted
on said resilient pads, a compressor on said base,
said compressor having an inlet pipe and a closed
crank-case, means on said inlet pipe to silence 10
the intake of air thereto, a breather tube con
necting said crank-case to said inlet pipe be
tween said silencing means and said compressor,
a discharge line on said compressor, a check
valve in said tank, means including a resilient 15
coupling connecting said discharge line to said
check valve, means to silence the discharge of air
through said valve into said tank, and unload
ing means to release the pressure from said dis
charge line.
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