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Патент USA US2122462

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July 5, ‘1933-
s. c. FRICKE
Filed Oct. 12, 1936
3 Sheets-Sheet 1
2.9 454
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61213 C’, Bic/2Z6.
July 5, 1938.
Filed Oct. 12. 1936
3 Sheets-Sheet 2
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July 5, 1938. V
Filed Oct. 12. 1936
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3 Sheets-Sheet 3
621! C Frz'c e.
Patented July‘ 5,‘ 1938
‘ 2,122,462
' Guy 0. Fricke, Pleasant Ridge, Mich. -
Application October 12, 1936, Serial No. 105,186
(Cl. 230—140)
1 Claim.
The present application relates to pump con
structions. More particularly it relates to a
sealed type of pump primarily adapted for use as
the compressing unit in a refrigeration system
which bolts pass axially through the cylinder
walls and are threadably received by the sleeve -
which, as mentioned above, is secured to the rotor.
This construction is found to provide one which
driving the same is completelysealed within an
facilitates the assembly of the parts and greatly
simplifies the mountingv of the mechanism with
enclosing housing.
in the housing.
5 and in which the pump as well as the motor for
It is a primary object of the present invention ,
to provide a pump construction of this general
10 character which is extremely efficient, cheap to
manufacture, quiet in operation and exceptionally
easily and conveniently assembled.
The apparatus generally comprises a cylin
drical housing in which is mounted an axially
15 disposed non-rotatable shaft. The motor is
mounted concentrically with respect to the shaft
and is adapted to rotate therearound. The rotor
of the motor is provided with a sleeve locked in
engagement with respect thereto which sleeve
20 carries at one end thereof a cylinder coaxially
disposed with respect to the shaft and surround
The invention further contemplates a‘ novel
construction andlarrangement of parts in which
various of the parts are manufactured from cast 10
iron while others are made from hard steel and
in each instance the parts are so constructed and
arranged that the relatively‘movable members
provide bearings between a cast iron member and
a steel member in all instances in order that the 15
apparatus will be extremely long wearing and
thus render adjustment thereof unnecessary after
the device has been once completely assembled.
It is a further object of the invention to pro
vide a pump of this general type in which the 20
eccentric parts of the pump which rotate during
ing an eccentric portion formed on the shaft. A ' operation of the pump have relatively small mass
, valve ring is disposed in this cylinder which valve in order that the eccentric mass of the pump as a
ring is positioned with respect to the cylinder by
25 means of two diametrically opposed reciprocably
mounted vanes which engage the surface of the
valve ring. The valve ring is provided with an
axially extending recess adapted to receive. the
rounded end of one of these vanes in order to
30 effect rotation of the valve ring with the cylinder
as the latter rotates.
It is an object of the present invention to pro
vide a pump of the general type outlined above
whole will be greatly reduced thereby greatly
minimizing, wear on the" various parts, reducing 25
vibration, and contributing greatly to a quiet and
smoothly operating unit.
Another object of the present invention is to
provide a pump construction of this general type
embodying novel lubrication features, as a result 3o~
of which an ample supply of lubricant ismain
tained adjacent all of the bearing surfacesof
the pump construction as a whole, and the circu
lation of'such lubricant is maintained as the
.in which the central axially disposed ‘shaft about 7
of the rotation of the pump parts.
35 which the various rotary parts of the pump move,
is supported at both its upper and lower ends and
the rotatable parts of the apparatus are jour
naled on this shaft between its ends. Conse
quently when one, end of the shaft is locked
40 ‘against rotation,.both ends provide a firm con
centrically disposed. support for the rotary parts
which?are journaled upon the shaft.
Still further the present invention contem
The oil system embodied in the present appa
ratus includes a plurality of downwardly pro
jecting scoops which extend into a reservoir ‘of
oil maintained in the bottom of the housing or
casing in which the pump construction is 40
mounted. These scoops, due to the rotation of
the member in which they are mounted, serve to
positively feed oil upwardly to a point adjacent‘
plates the provision of a sleeve secured to the ' the bearing of the rotor of the motor upon the
45 motor, which sleeve is press ?tted into the rotor
in .order to. effect a tight non-rotatable connection
therewith. The sleevels journalled onthe sta-_
tionary centrally disposed‘shaftt This construc-_'
, tion provides one which is extremely satisfactory
50 and exceptionally simple to assemble.
Still further ‘the present invention contem
stationary centrally disposed shaft. At this point 45
a plurality of tangentially disposed ducts ‘are pro‘- '
vided, so that the force resulting from the rota- '
tion of the apparatus serves to urge the'yoil‘ in
wardly against the normal centrifugal force to
provide lubricant for the bearings of thevarious 50
moving parts. The oil is fed downwardly through
plates the provision of novel means for securing
a helical duct around the vcentral shaft tojthe
thec'ylihder construction to this sleeve, which
pump chamber and through'a second oppositely . ,
means'y-include axially disposed ,bolts extending
disposed helical duct the oil'is automatically fed
55 along lines parallel to the axis of the cylinder, " upwardlyinto th'epump chamber from the lower 55 "
end thereof, thus providing a construction in
which positive lubricant feed is provided into the
pump chamber from both axial ends thereof,
thereby insuring proper lubrication of all bearing
Still another important feature of the present
invention resides‘ in the provision of a novel ex
haust valve for the pump chamber in which a
valve construction is provided which is easily and
10 simply constructed, and installed and which is
particularly e?ective in operation.
The above enumerated objects are merely illus
trative of certain features and desirable results
inherently obtained by the structure of the appa
15 ratus described in detail below.
Many other and further objects, advantages,
and features of the present invention will be
Fig. 10 is‘ a fragmentary transverse sectional
view taken substantially on the line Iii-i0 of
Fig. 1 illustrating in detail the manner in which
the cap at the lower end of the cylinder is secured
in position and the relative disposition of the
ports which serves to v‘pick up and distribute the
supply of oil to the apparatus.
Fig. 11 is a fragmentary plan view taken sub
stantially on the line lI-il of Fig. 1 illustrat
ing in detail the connections for supplying elec 10
tric current to the motor within the housing,
Fig. 12 is a fragmentary transverse sectional
view taken substantially on the line l2-l2 of
Fig. 11 illustrating in detail the manner in which, 15
the connections are sealed with respect to the
wall of the housing, thus maintaining the hous
come clearly apparent from the following speci?
ing completely closed and ?uid tight yet at the
cation- when considered in connection with the
through a pump showing one embodiment of the
same time permitting the introduction of cur
rent to supply the-electric motor.
While‘ it will be readily understood from the
following description that the relatively specific
disclosure shown in the accompanying drawings
present invention and illustrating the'various
is provided for the purpose of making clear one
20 accompanying drawings forming a part thereof.
In the drawings:
Figure 1 is a vertical sectional view taken
25 parts in assembled relation.
stantially on the line 2-2 of'Fig. 1, illustrating in
speci?c embodiment of the pump construction 25
which has been found to be extremely satisfac
tory from a commercial standpoint, it will be
detail the cross sectional configuration of the
readily understood that the specific embodiment "
pump cylinder, the‘ valve ring, and the exhaust
ports for the pump chamber showing the mount
disclosed herein is merely illustrative of the
generic inventive concept presented and that 30
Fig. 2 is a transverse sectional view taken sub
' many and substantial departures therefrom may
Fig. 3 is a transverse sectional view taken sub
be made which will fall within the scope of the
present invention as defined in the appended
ing of the valves therefor.
stantially on the line 3-3 of Fig. 1, illustrating
in detail the cross-sectional configuration of’ the
.35 pump chamber and speci?cally the manner in
which the valve ring is positioned therein by
means of the radially reciprocable spring pressed
In the embodiment shown in the drawings the 35
pumping unit includes a housing or casing [5,
which in the form shown is made from a single
vanes which serve to maintain the valve’ ring in
integral casting of generally cylindrical con?gu-'
predetermined position with respect to the cylin
40 der with which it is associated.
Fig. 4 is a transverse sectional view similar to
Fig. 3 illustrating the'cylinder after being ro
tated through 90° in order to more clearly illus
ration, closed at the bottom and provided with
trate the movement of the valve sleeve or ring
45 with respect to the cylinder in which it is mount
ed and the eccentric upon which it is disposed.
Fig. 5 is an enlarged elevational view taken
substantially on the line 5-5 of Fig. 2, illustrat
ing in detail the mounting of one of the valve
so members for the exhaust portion of the cylinder.
Fig. 6 is a‘ transverse sectional view taken sub
stantially on the line 6—6 of Fig. 5 illustrating
in detail the mounting of one of the valve mem—
bers serving to close one of the exhaust ports of
the pump chamber.
a plurality of axially disposed webs l6 which ex 40
tend from the central portion of the bottom
across the bottom wall and axially up the sides of
the casting and mate at the top with an inte
grally formed shoulder I'll, which serves to pro
vide a'?ange for securing a cover in position 45
upon the body of the housing. These webs not
only provide an extremely strong structure but
serve to make available an extremely large area
for the purpose of disseminating heat._ The ax
ial central portion of the bottom of the pump 50
casing is provided with a closed axially extending
projection l8 forming an internally accessible
socket which as will hereinafter be seen serves
to provide means for mounting the shaft within
the casing and at same time provides an inlet 55
Fig. '7 is a transverse sectional view taken sub
stantially on the‘ line ‘1-1 of Fig. 1 illustrating
port for the fluid to be pumped. Also preferably
view taken substantially on the line 0-4 of Fig.
interior wall of the housing I‘. The cylindrical
projection 26 has its outer surface recessed to
provide a seat for a resilient sealing annulus 28
formed of rubber or similar suitable material
integrally formed at the bottom of the casing are
in detail the oil supply duct and the manner in bosses i9 and 20 which serveto provide means
which lubricant is conducted from the cylinder for mounting the casing upon the base of the
construction to the bearings around the central
apparatus with which it is to be associated.
ly disposed supporting shaft.
The housing member is also provided with an
Fig. 8 'is a vertical sectional view taken sub
aperture or port 22 adjacent the lower side of
stantially on the line 8-8 of Fig. 7 illustrating ' one of the walls thereof which aperture is inter
in detail the lubricant duct-and‘ the manner in nally threaded to receive a conduit (not shown)
which lubricant is conveyed from the lower por
for conducting the ?uid discharged from the, 65
tion of the casing to the central portion of the pump mechanism.
support shaft, and further the manner in which
The upper end of the housing II is adapted to
such lubricant is distributed throughout the ax
be closed by a cover, preferably formed from a
ial length of the support shaft and to the pump casting 25 which casting has a cylindrical projec-i
70 chamber.
tion 26 thereon adapted to cooperate with a com 70
Fig. 9 is a" fragmentary transverse sectional plemental recess or shoulder 21 formed upon the
1 illustrating in detail the manner in which all
is picked up at the lower end of the stationary
shaft and fed upwardly to the pumping‘ cylinder.
" which annulus is oiled or greased thoroughly
downwardly therefrom a concentrically disposed
prior to its placement within the housing. The"
pilot 49 upon which is mounted the upper end of
a cylinder element 50. The cylinder element 5|!
is preferably relatively heavy casting with a cy
lindrical aperture 5| therein concentrically dis
cover 25 is secured in position on the housing
by means of an annular series of bolts 29 which
pass. through suitable circumferentially spaced
apertures in the cover plate 25 and are thread
ably received by a series of complementally spaced
internally threaded recesses provided ~in the
?ange I‘! of the housing l5. As these screws 29
'10 are set up the rubber annulus 28 will be tightly
compressed in order to provide a fluid tight joint
between the cover and the housing proper.
Preferably integrally formed on the central
portion of the cover 25 is a cylindrical boss 36
posed with respect thereto. This cylinder 5|
when mounted co-axially with respect to the axis
of the shaft 32 surrounds the same. The lower
end of the cylinder 5| is closed by means of a cap
plate or cover element 55, which is secured thereto 10
by means of an annular series of axially extend
ing cap screws 56, which extend upwardly through
the cap member 55 axially through suitable Taper,
tures in the wall of the cylinder member 50, and
are threadably received in the ?ange 48 of the 15
sleeve 46 thus retaining all of these parts in as
below. The lower end of this shaft 32'is adapted sembled relation.
The cap member 55 is preferably formed of cast
to be received within the hollow cylindrical socket
|8 described above and is locked against rotation iron and has interposedbetween its lower axial
therein by means of aset screw 33 threadably end and the casing 50 an annular washer 60, 20
received in the wall of the socket l8 and secured formed of hardened steel thus providing a thrust
in position by means of a lock nut. 34. It will bearing for the entire rotary assembly.
The portion of the centrally disposed shaft 32
therefore be readily appreciated thatethe shaft 32
is not only rigidly supported at each of its ends which lies within the. cylinder is enlarged to pro
but is locked against rotation and consequently . vide an eccentric 62 which eccentric has a cylin 26
rigidly ?xed and supported with respect to the drical external con?guration, the axis of which
is slightly offset with respect to the axis of the
housing within which it is mounted.
Further it will be readily understood that the shaft 32 of which this eccentric'62 is an integral
mounting of this shaft is such that while it is part.‘ A valve ring 65 snugly surrounds this ec
rigidly supported at both its ends and mounted centric 62 and is sufficient thickness so that one 30
surface of the valve ring will always lie in close
in such a way that it will not rotate the construc
tion and arrangement of parts is such that the engagement with the interior wall of the cylin
cover may be conveniently removed from the der 50. The cylinder 50 is cut away to provide a
housing and replaced thereon without in any pair of diametrically opposed radially disposed
way disturbing ‘the mounting of the shaft ‘32. slots 66, which slots extend axially throughout the 85
This construction greatly facilitates the assembly entire length of the cylinder. These slots serve to receive vanes 61 and 68 which vanes may be
of the device as a whole and provides an extremely
satisfactory mounting for the shaft giving the formed of steel and are preferably drilled out to
same complete and adequate support at all times materially decrease the weight thereof. Each of
the vanes 61 and 68 has a bracket 10 associated
‘during operation of the apparatus.
In substantially its axial central portion the therewith which bracket is of generally U-shaped
16 which is adapted to receive and closely surround
the‘upper end of a shaft 32 described in detail
casing is provided with an integrally inwardly
form and is secured to the cylinder member 50 I
projecting formed bead or ridge 40 which serves
by means of screws 1|. Each of the bracketse'lll
has a rivet 12 in the outer end thereof which
to accurately position a ?eld or stator 4| of an
electric motor which serves to drive-the pump. serves to position the outer end of the compres- This member 4| is preferably press ?tted within sion coil spring 13, the inner end of which en
the housing |5 sufficiently tightly so that relative ' gages the radially outer end of the vane with
rotation thereof with respect to the housing will which it is associated. It will be clear from the
be precluded and yet'at the same time the stator foregoing that these springs con?ned in this
- may be removed when it is‘ desired to obtain ac
manner serve to constantly urge the vanes .61 and
cess to the pumping mechanism located in the
lower portion of the casing in the manner de
scribed in‘ detail below. This press ?tting of the
stator 4| within the housing has been found to
55 provide an exceedingly satisfactory and‘ simple
method of assembling this element with respect
to the casing and one which readily facilitates re
moval of the parts in order to obtain access to the
68 inwardly toward the axis of rotation of the
cylinder as a whole. Itv will be‘ readily appre
The motor also includes an armature 44 rotat
ably mounted with respectto the ?eld. This
armature 44 has a relatively large cylindrical
axiallydisposed opening 45 therein, and as whole
is press ?tted upon a sleeve member 46 which
65 hasv an axial bore 4'|_ adapted to closely surround
and provide a bearing upon the vertically dis-'
posed stationary shaft 32. k The shaft 32 is prefer
ably formed of hardened steel and the sleeve 46
' >
is preferably a casting in order that a long wear
70 ing journal will be provided between these two
members. This bearing for the rotary portion of
the motor is supplied with lubricant in the man
ner described in detail below.
_ .
The sleeve 46 has an-integrally formed annular
75 ?ange 48 at :its lower end and- has projecting
ciated that as the cylinder as a whole rotates at
relatively high‘ speed the resulting centrifugal
force would normally tend to move these vanes 55
outwardly and consequently the springs 13 must
be of suflicient strength to overcome this centrif
ugal force and urge the vanes inwardly towards
the axis of rotation of the apparatus at all times.
The inner end of the vane 68 is rounded to 60
provide a semi-cylindrical surface which fits into
a complemental semi-cylindrical recess 15 formed
in the exterior surface of the valve ring 65. This
semi-cylindrical recess 15 extends throughout the
entire axial length of the valve ring and it'will
be apparent that irrespective of the position of
the valve ring the end of the vane will remain
seated therein at all times. The inner end of the
vane 61 has preferably a ?at surface and merely
abuts in sealing engagement ‘with the peripheral 70
surfaces of the valve ring 65, thus separating the
, interior of the cylinder into two separate cham
bers, the volume of which will be varied as a re
sult of rotation of the cylinder with respect to
the shaft 32.
The shaft 32 is bored out at its lower end to
provide an axiai duct 80 which extends upwardly
from the lower end of the shaft to a point sub
stantialiy in the axial central portion of the
eccentric 62 on the shaft. The eccentric por
tion 62 of the shaft is provided with a circumfer
entially extending channel or recess ‘Ill which
extends slightly more than 180° therearound and
this recess 11 connects with the axial duct '80 by
10 means of a lateral bore 8I. In order to establish
communication between the interior of the cylin
der and. the recess 11 a pair of ports 85 are drilled
ing ‘pores I00 are provided in the wall of the
cylinder 50 which bores are preferably located on
diametricallyeopposite sides thereof. These bores
I00 as is clearly shown in Fig. 8 of the drawings
are of preferably enlarged diameter at their lower
ends and serve to'receive hoilow dowel members
IOI which dowel} members are provided with an
axial bore i02 therethrough and are closed at
their lower ends. These dowels extend a substan
tial distance downwardly below the lower end of 10
the cylinder construction and sufficiently far
down to have their lower ends submerged in a
supply of oil normally maintained at a predeter
through the valve ring in substantially the axial
central portion thereof in such a position that
15 their inner ends communicate with the recess ‘i1
when the valvering is in such a position, that the
inner ends of these ports register therewith. Due
to the fact that the recess 17 extends only
throughout a part of the circumference of the
mined level in the lower portion of the housing.
The dowel members IOI each have a lateral open
ing I04 adjacent their lower ends which opening
communicates with the hollow bore I02 of the
dowel members. While the two hollow dowels
disposed on each side of the cylinder casing may
eccentric 62 it will be readily appreciated that . be of the same length, it has been found prefer 20
. communication through the ports 85 will only
able to position one of these dowels in such a
established at certain predetermined periods dur
manner that it extends downward further into
the body of oil than the other in order that the
path traversed by the lateral opening I04 in one
of the dowels will be above or below the path 25
ing the revolution of the cylinder around the es
centric. The lower end of the shaft 32 which
seats in the socket I8 has the axially extending
duct 80 therein opening out from the axial end
of the shaft and communicating with a lateral
intake port 90 drilled in the wall of the casing
adjacent the lower end of the socket I18 thus
30 establishing communication with the axial bore
traversed by the other, thus making an adequate
supply of oil available to both of the dowels.
The lateral opening in the lower ends of the '
hoilow dowel members are- preferably positioned
so that as rotation of the cylinder member 50 30
takes place oil will be scooped up by these mem- .
A pair of diametrically opposed recesses 9I
milled in the exterior wall of the cylinder 50 and
bers and positively forced upwardly through the
hollow bores I02 in the dowel members and‘ up
wardly through the duct I00 to the upper end of
the cylinder construction. Suitable bores I01
suitable exhaust ports 92 are drilled from the
base of these recesses radialiy inward through
the wall of the cylinder. These ports 92 may be
surrounded at their outer end by means of an
are provided in the flange 48 of the sleeve mem
ber 46, ‘the bores I 01 registering with the bores
annular valve seat 93 which may be conveniently
formed by a hollow milling cutter fed radially
~inwardly and concentrically disposed with respect
to the ports 92.
Iiiil in the cylinder member.
7 communicates with a tangentially‘ disposed 40
semi-cylindrical duct I08 which in turn ‘commu
nioates with an annular oii distribution recess I09
formed in the upper surface of the ?ange 48 on
These ports are adapted to be controlled by
means of ?exible valve elements 94 retained in
position by means of screws 95 threadably re
ceived in the wall of the cylinder and utilized for
the purpose of locking the valve members 94
in such a position that these valve members will
lightly be disposed on the valve seats 93. The
The upper ends
of each of the bores I0'I as is clearly seen in Fig.
the sleeve 46. It will be readily appreciated that
the semi-eylindrical duct I08 and the annular oil
receiving recess I09 will have the upper sides
thereof closed by means of the lower surface of
the armature’ of the motor in which the sleeve 46
valve member 94 is preferably retained in position
is press ?tted as has been described above. The
on the screws 95 by means of a pair of interleck
tangentially disposed ducts I08 are so ‘positioned 50
ing square washers 95 the exteriors of which fit
within the recess 9| to preclude rotation thereof
and which have the valve members 94 clamped
therebetween, as is clearly illustrated in Fig. '6
55 of the drawings. It will be readily appreciated
from the construction shown that this assembly
- of interlocking square washers, valve members
~ and screws serve to accurately position the iiex
ible valve members 90 over the seats 93 of the ex- I
60 haust ports 92.
‘ Further it will be readily understood that the
exhaust from the pumping cylinder 50 is dis
charged into the interior of the casing and inas
much as the interior of the casing is completely
65 closed, the only escape for the compressed gases
will be outwardly through the outlet 22 which
sert'es to conduct the compressed gas to the con
denser of. the refrigeration system.
that as the cylinder structure as a whole rotates
these ducts will serve to; accelerate the flow of oil
inwardly toward the axis of rotation of the shaft
and in this manner serve to substantially coun
teract the normal tendency .of centrifugal force 55
to effect the ?ow of this oil in opposite direction.
The oil from the annular oil distribution recess
I09 may fiow downwardly through a pair of ducts
i_I2, clearly seen in Fig. 1, to supply lubricant to
the bearing surfaces between the shaft 32 and 60
the sleeve 46. In order to insure a substantially
‘uniform distribution of lubricant throughout the
entire axial length of the sleeve 46 the shaft 32
has cut therein a,helically extending groove or
duct II; which extends‘ throughout the entire
axial length of the‘ sleeve 46 and serves to distrib
ute the oil supplied by the duct I I2 throughout the ,
entire bearing surfaces 'of these elements. In
In order to insure long life and smooth oper
addition a heli'cally extending duct II4 serves to
ation of the apparatus as a wholev it is essential carry oil from the passageways I I2 downwardly to
that a lubrication system be provided which is in the pump chamber and communicates with a duct .70
all respects self feeding and serves to maintain II5 helically extending around the peripherai
an adequate supply of lubricant between all of surface of the eccentric portion. 62 of'the shaft
the‘bearing surfaces of the apparatus. In order 4 32, thus insuring uniform distribution of lubri
75 to accomplish this result a pair of axially extend
cant throughout the bearing surface between 75
the eccentric portion of the shaft 62 and the
valve ring 65. In order to further assure proper
press ?tted into the rotor of the electric motor
and the shaft 32 is then mounted within the
lubrication'between the bearing of the valve ring
on the eccentric portion of the sleeve 62, a hel
ically disposed duct II6 extends up the shaft 32
its vanes and valves mounted thereon is‘then
from a point below the level of oil in the housing.
This duct II‘I connects with a helically extend
ing duct II8 on the peripheral surface of the
eccentric element 62 and serves to convey oil
10 upwardly from the oil reservoirs in the lower por
tion of the casing onto the bearing surfaces
between the valve ring 65 and eccentric portion
62 of the shaft.
As is clearly seen in Fig. 9, a tangentially dis
15 posed port I20 is provided in the cap member 55,
the inner end of this port communicates with the
lower end of duct H6, and it will be readily ap
preciated that as the cap member 65 rotates
with the cylinder to which it is secured this tan
20 gentially disposed port I20 will serve to scoop up
oil from the reservoir and positively feed this
lubricant upwardly through the ducts H6 and
H3, thus insuring a positive supply of lubricant
sleeve. The completely-assembled cylinder with
bolted in position upon the sleeve 46 by means of
cap screws 56 which as has been explained above
further serve the function of retaining the cap
member 55in position. The lower'end of the
shaft 32 may now be locked against rotation by
setting up the set screw 33 and locking the same 10
in position by means of a lock nut 34. The cover
plate 25 of the housing'now has the leads from
the motor connected thereto and is then seated
in position with the boss 30 surrounding the upper
end of the shaft 32 in order to accurately position 15
the same centrally with respect to the housing.
The cover then may be bolted ?rmly in position
by means of the cap screw 23 thus sealing the
housing and the apparatus is ready for installa
tion in a refrigerator system.
The operation of the apparatus is substantially
as follows. When the electric current is turned
on the rotor 44 of the motor will effect rotation of
upwardly from the lower axial end of the cylinder. ' the sleeve 46 and the cylinder assembly 50 which
In order to insure adequate lubrication for the
bearing surfaces between the rounded end of the
vane 68 and the semi-cylindrical recess ‘I6 in
the valve ring it has been found preferable to
provide an oil receiving groove I22 in the base of
the recess 15 which 011 retaining groove will serve
to maintain an adequate supply of oil adjacent
these bearing surfaces in order that they will be
properly lubricated at all times.
Inasmuch as the housing must at all times be
35 maintained ?uid tight it is not only desirable but
virtually essential that some permanent and sat
isfactory means he provided for ‘introducing the
leads supplying current to the electric motor
through the walls of the housing and establish
ing a ‘fluid tight connection therebetween at the
same time insulating these leads from the metal
lic wall of the housing. In order toachievethis
end the present invention contemplates the pro
. vision of the construction substantially illustrated
45 in Fig. 12 of the drawings. It will be seen that
[the cover member 25 of the housing is preformed
to provide three substantially cylindrical ‘aper
tures I30 therein, bolts I3I extend through these
apertures and are provided with heads I32 at
50 ‘their inner ends which ‘provide means for con
necting the leads from the motor. The bolts are
provided at their outer ends with nuts I33 and
I34 which provide means for connecting the
power leads to the housing. Washers I35 are lo
55 cated underneath the nuts I33 and the heads of
the bolts I32. These washers are preferably.
formed of bakelite or other suitable insulating
material. A pair of cylindrical insulating mem
bers I36 are disposed around the shanks of the
bolts I3I and have prisitioned axially therebe
tween resilient rubber insulating members I31
which will be tightly compressed as the nuts I33
are" screwed down. The axial compression of
this resilient rubber member I31 between the
65 insulating sleeves I36 will serve to. expand the
same firmly into contact with 'the walls of the
, aperture I30 thus effecting a tight seal. It will
is connected thereto.
This rotation will take 25
place around the stationary centrally disposed
shaft 32. In view of the fact that the vane 68 has
its inner rounded end seated in the semi-cylindri
cal recess in the valve ring 65 it will be readily
understood that this valve ring will rotate with 30
the cylinder and slide around the eccentric por
tion 62 of the stationary shaft 32. ‘This move
ment of the valve ring serves to continually vary
the capacity of the chambers formed on the 0p
posite sides of the {cylinder and will serve to draw 85
?uid upwardly through the duct 80‘outwardly
through the lateral port 8| into the circumfer
entially extending groove ‘I'I through one of the
ports 85 into one of the chambers and expel this 40
?uid through one of the exhaust valves 92 into
the housing. Both chambers function substan
tialy alike and it is noted that the various ports
are so positioned that substantially maximum ef
ficiency is obtained. Rotation of the cap mem
ber“ serves to cause the port I20 to scoop up
011 from the supply in the bottom of the casing
and feed this oil upwardly through the helically -
extending duct H6 and duct II8 to maintain the
moving parts within the cylinder properly lubri 50
cated at all times. Likewise the hollow dowel
members serve to feed oil upwardly through the
duct I00 into the annular oil distribution duct
I03 from whence this oil is fed both downwardly
andupwardly along the stationary shaft 32 by 55
means of the helical ducts II3, II‘ and I I5}. Con
sequently it will be readily appreciated that all
working surfaces and relatively movable contact
ing parts within the chamber are supplied with
lubricant under pressure at all-times during the 60
operation of the apparatus.
'_ In order to obtain satisfactory operation of the
apparatus it is essential that the vanes engage the
surface of the valve ring with a light but positive '
pressure when the apparatus is operating at nor 65
mal speed. The centrifugal force resulting from
'the rotation of the cylinderconstruction- con
be readily appreciated that the remainder of stantly tends to move these vanes outwardly but
it will be readily understood that these vanes are ‘ ‘
the washers serve to effectively insulate all por
urged inwardly not only by means of the com 70
70 tions of the bolt I3I from the walls of the hous
ing and provide asimple and effective means for pression coil springs ‘I3 but also as‘ a result of the
fact that there is substantially greater pressure
‘ ‘ introducing the leads to the interior of the hous
existing within the housing than within the cyl
ing to connect with the motor.
' The apparatus may be conveniently assembled inder and consequently this pressure di?erential
in the following manner. The sleeve 46 is ?rst serves to effect an inward movement of the vanes
in addition to the inward movement thereof ef
fected by means of the coil springs 13.
While but one speci?c embodiment of the pres
v ent invention has been illustrated in the drawings
and described above it will be readily understood
that this relatively speci?c disclosure is merely
illustrative of the generic inventive features pre
sented in the present application. Many other
and further modi?cations thereof falling within
10 the scope of the invention as de?ned in the sub
joined claim will be clearly apparent to those
skilled in the art.
What is‘ claimed is:
A pumping unit including in combination an
enclosed sealed casing having a centrally d1S€
posed stationary shaft therein, said shaft having
an eccentric portion formed thereon, a valve ring
snugly surrounding and rotatably mounted on
the eccentric portion of said shaft, an intake port
in said shaft having one end opening in the
peripheral surface of said eccentric portion and
the other end opening in one axial end of said
shaft, a cylinder rotatably mounted in said casing
on said shaft adapted for rotation coaxially with
said shaft, said cylinder surrounding the eccentric
portion of said shaft, the walls of said cylinder
having slots therein, diametrically disposed ra
dially reciprocable vanes slidably mounted in said
slots, resilient means for urging said vanes into
engagement with the periphery of said valve ring,
one of said vanes having a driving engagement 10
with said valve ring whereby to e?ect rotation of
said valve ring with said cylinder, the other of
said vanes having a sliding engagement vwith said
valve ring, said valve ring having ports therein
serving to establish communication between said 15
intake port in said shaft and the interior of said
cylinder, said cylinder having exhaust ports in
the walls thereof and valves for controlling said
exhaust ports.
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