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Dec-~31, 1946-
Filed NOV. 15, 1943 ‘
_ \ ___
44 42
Patented Dec. 31, 194%
para "r
Francis 1. Rataicaak, Dayton, t'iliio, assignm- to
General Motors?omration, Dayton, Ohio, a I.
corporation of Delaware
' Application November 15, 1943, Serial No. 510.315v ‘
ion. 82-415)
2 .
This invention relates to refrigerating appa-~
larged portion 38 in which a check valve assembly _
ratus andmore particularly to an improved re
generally designated by the reference numeral 38
frigerant compressor valve arrangement for use v
is mounted. ' The check valve assembly Bil com
prises a tubular element 10 provided with an in
in a refrigerating system.
This application is directed to an improvement
over the ‘arrangement disclosed in my copending
application Serial Number 394,645; ?led May 28,
More particularly it is an object of this inven
tion to reduce the amount of labor required in
machining the parts of a compressor.
Further objects-and advantages of the present
invention will be apparent from the following de
scription, reference being had to the accompany
ing drawing, wherein a‘ preferred form of the 15
present invention is clearly shown.
In the drawing:
ternal shoulder which provides a valve seat 62.
A valve plate 44 cooperates with the seat 62
in accordance with well-known practice.
A combination valve stop and valve guide mem
ber 46 is provided which is formed out of a ?at
piece of stamped sheet metal material and bent
into the shape shown. The element it includes
three or more pointed projections 68 which serve ,
as stops for limiting the upward movement of the
valve plate 44 and alsoincludes a plurality of
valve guide members 5| which not only serve to
guide the valve plate 44 but also serve to limit the
downward movement of the element fit within the
Fig. 1 somewhat diarrammatically shows a re
frigerating system including a compressor con
structed in accordance with my invention;
Fig. 2 is a fragmentary sectional view on a
element 40. The outer diameter of the element
60 is slightly less than the diameter of the pas
20 sage in which it is mounted whereby the element
at is free to adjust itself within the passage W.
enlarged scale showing the valve'assembly.
A neoprene gasket 53 is provided as shown-and
Referring now to the drawing in which I have
serves to provide a gas tight joint between the
shown a preferred embodiment of my invention
outer wall of the element 40 and the wall of the
reference numeral ill designates generally a‘her 25 passage 30. ,
‘' metically sealed motor compressor unit. Refer
The valve assembly 38v is held in place in the
ence numeral i2 designates a substantially cup
recesses by the compressor and plate element til
shaped stamped sheet metal ‘casing which forms
which is secured to the block 32 and one or more
the main support for both the compressor as
additional blocks 39, which in turn are welded
sembly generally designated by the reference 30 or otherwise secured to the bottom wall of the
numeral 86 and the motor stator iii. Reference
casing l2. The bottom surface of the compressor
numeral l8 designates a conventional motor ro
and plate 50 is a lapped surface whereas the top
tor. A stamped sheet metal end cap i'i encloses
surfaces of the mounting blocks 82 and 33 are
the upper end of the cup-shaped casing 82 and
merely rough cut surfaces. 'The term "rough cut
forms therewith a high pressure refrigerant va
surface” as used herein is intended to designate
por chamber. The end cap it is welded or other
a surface such as produced by the ordinary cuf
wise secured to the main casing 52. Heat con
tirg tool of a latheas distinguished from a highly
ducting fins 2! may be secured to the outside of
polished‘ or lapped surface. It has been found
the casing element 52 to help dissipate the heat.
that the blocks 32 and 39 may be used to accurate~
The high pressure gas ?ows through the con 40 ly support the compressor in true perpendicular
denser 26 in which it is condensed and collects
relationship with respect to the axis of the cen- '
in liquid phase in the receiver 22. The liquid
tral opening of the motor stator, even thoueh not
refrigerant flows from the receiver 22 into the
all of the tool marks have been removed from the
evaporator 24 through a conventional refrigerant
upper surface of the mounting blocks.
flow control device 28. The refrigerant flow con 45 The upper end surface 51 of the element to is
trol device may be of any conventional construc
tion and is preferably of the ?xed restrictor type
in which the high pressure liquid refrigerant is
required to flow through a long narrow capillary
a lapped surface which when pressed against the
lapped surface on the end plate Elli formsa gas
tight seal between the element All and end plate
so. The thickness of the gasket 53 is such that ‘
50 when the compressor is fastened onto the mount
The refrigerant vaporized in the evaporator 24
ing blocks 32 and 39 by one or more bolts 53, the
returns to the compressor through the element
surface 51 is held ?rmly in engagement with the
28 which communicates with a passage 30 formed
machined surface of the compressor end plate
in the compressor mounting block 82. The upper
element 50. By virtue of this arrangement it is
end of the passage 30 is provided with an en 65 obvious that the valve assembly 88 is held in
elements is: are provided with lugs m and m
place solely by the compressor end plate It where
which are bent over so as to hold the motor sta
' .tor in proper position within the casing if.
by in the event of valve failure, the damaged
valve part or parts may be replaced with a mini
mum amount of di?iculty.
The foregoing construction reduces, the num
ber of parts required and simpli?es the machining operations onsthe few parts which are re
quired thereby cutting the cost of assembly con
As shown in Fig. 1 the compressor assembly
Ill comprises a lower end plate I.’ a cylinder ole-
ment 5! and an upper end'plate ilhwhich includes
the main bearing 5%. The compressed refriger
ant leaves the compressor,“ through the outlet
While the form of embodiment of the inven
tion as herein disclosed constitutes a preferred
80 which discharges into the interior of the main
form, it is to be understood that other forms
motor-compressor casing II, in accordance with _ - might be adopted, as'may come within the scope
the pressure surround-'
standard practice whereby
ing the compressor corresponds to the highside
of the claims which follow.
What is claimed is aafollows:
i. In a refrigerating system, a compressor, a
The ‘compressor assembly i4 shown in the draw’ 15 casing enclosing said compressor, said compres
ing is intended to represent any conventional ro- ' ‘ sor having an inlet port in one wall thereof and
tary compressor having a bottom inlet port such
as the port 18. In view of the fact that many of
having a lapped surface adjacent to- said inlet‘
- port, means for discharging the compressed re~
the details of the compressor are immaterial to
frigerant into said casing, a compressor mount
my present invention, it ‘is not deemed neces
sary to give a detailed description of the. com
pressor and its mode of operation. in this appli
cation. For a more detailed description of’ the
compressor construction shown herein reference is
ing block secured to said casing and having a
low pressure refrigerant vapor passage therein
communicating with said inlet port, means pro
viding a gastight seal between the passage in said
mounting block and said compressor including a
hereby made to my aforementioned copending 25 tubular insert in said vapor passage having a
lapped surface inengagement with the lapped
The end plate 80 is provided with a tapered
surface on said compressor, and a gasket means
passage 18 which conveys the low pressure refrig
between said tubular insert. and the wall of said
‘erant vapor from the inlet valve assembly to the‘ 30 passage, said gasket means serving to urge said
compression chamber 88. By virtue of the taper
tubular insert into sealing engagement with the
in the walls of the passage ‘I8, any slight misalign
lapped surface on said compressor.
f - ment between the end plate 50 and the inlet valve
2. In a sealed motor compressor mechanism,
38 will not interfere with the free flow of refrig
the combination, a casing, a compressor within
erant from the inlet valve to the compression
35 said casing having a port in one wall thereof,
said compressor having a smooth outer ‘surface
The mounting block 32 is provided with'a re
adjacent said port, a compressor mounting block
frigerant charging plug 88 which has a ?rst pas
' projecting through one wall of said casing'and
sage 88 communicating with the compressor in
' having a refrigerant passage in alignment with
let passage 30 and a second passage 88 communi 40 said port, and a valve assembly disposed within
cating with the passage 90 in the mounting block
said refrigerant pe and held in place therein
32. The lower end plate 50 of the’compressor is
by the compressor. said valve assembly including
cut away as at 92 so as to provide a passage from
means forming a gas tight seal‘with said smooth
the high ‘pressure refrigerant chamber to the
passage 88 and the passage l8. The outer ends
3. In a compressor mechanism. the combina
of the passages 88 and 88 are sealed by means is tion, a casing, a compressor within said casing
of a plug 94 and a lead plated copper gasket
having a port in‘ one wall'thereof, a compressor I
98. ‘The gasket 96 is provided with apertures $8
mounting block projecting through one wall of
in alignment with the passages 88 and 88. The
said casing and having a refrigerant'passage in
plug 94 is provided with a single passage I80
alignment with said port. a valve assembly dis
through which refrigerant and/,or‘lubricant may
posed within said refrigerant paseage and held
be added to or removed from the vrefrigerant sys
‘ in place therein by the compressor, said compres
tem upon partially unscrewing the plug 84. By
sor and said valve assembly including opposed
virtue of this arrangement, both the high side
smooth surfaces, and resilient means holding said
and the low side of the refrigerating system may
opposed surfaces in sealing engagement with one
be very quickly evacuated prior to chargingthe
’ system with refrigerant'and lubricant.
The motor stator I8 is held in place by means
‘of special clamps such as I02. In the prior art
4. In a sealed motor compressor mechanism,
the combination, a casing, compressor mounting
‘blocks secured within said casing, a refrigerant
devices it has been customary to provide a press
passage through one of said blocks, a valve as
?tbetween the outer shell of the compressor and 60- sembly disposed within said passage, resilient
the motor stator. In such an arrangement, it is
means for biasing said valveassembly so as to
very difficult to properly hold the motor stator
project beyond the surface of said block, the pro
in place unless a very heavy cast iron frame or .
jecting portion of said valve assembly including
the equivalent is used, and once the motor stator
a smooth sealing surface, a compressor assembly
is inserted, it is very dimcult to remove it for in
an inlet port in alignment with said pas
spection or repair purposes. 'By virtue of the
sage and having a smooth surface in engagement
clamping arrangement shown, a light weight sheet
with the smooth surface on said valve assembly.
metal casing may be used and the final sizing op
5. In‘ combination, a casing, a . compressor
eration may be performed merely by forcing a die
of proper size onto the open end of the casing 70 mounting block within said casing, a refrigerant
passage in said mounting block, a valve assembly
so as to deform the projecting portion of the
disposed substantially within said passage, a mo
clamps ill! the necessary amount. This arrange
tor stator disposed within said casing having a
ment of parts and method of. sizing eliminates
central opening therein, the upper surface of said
the necessity for turning the inner surface of the
outer shell i2 to size on a lathe. The clamping 75 mounting block comprising a' rough cut surface
arranged at right ‘angles to the axis of said cen- '
tral opening, a compressor assembly disposed
within said casing and having a smooth surface
wall member having a ?uid passage therein, a
compressor mounting member abutting said wall
member and having a fluid passage substantially
in alignment with said ?rst named passage, one
resting on said compressor mounting block and 7
having a port communicating with said refriger 5 of’ said members having a lapped surface adja
ant passage,'said valve assembly including an
cent said passage, the other of said members have
ing an enlargement in its ?uid passage, a valve
element having a smooth surface in sealing en»
gagement with said ?rst named smooth surface,
assembly disposed within said enlargement com
and a motor rotor disposed within said central
prising a tubular ‘member having a lapped end .
opening in driving engagement with said comm
6. In combination, a compressor, a casing en»
closing said compressor, said compressor having a a
surface in engagement with said ?rst named
'lapped surface, and means biasing said lapped
surfaces into sealing contact with one another.
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