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Патент USA US2404678

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July 23; 1946.
C. E.-WUENSCH
IMPELLER
Filed‘ June ‘5, 1944
‘2. Sheets-“Shae? 1
INVENTOR.
.
CHARLES Ema WUENSCH
BY
4777’.
July 23, 1946.
2,404,678
C. E. WUENSCH
IMPELLER
Filed June 5, 1944
2 Sheets-Sheet 2
1/,a.
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INVENTOR.
CHARLES
BY
ERG - WUEHSCH
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‘477-7’.
Patented July 23; 1946
2,404,678
UNITED STATES PATENT ‘ OFFICE f
2,404,67 8
.
INII’ELLER
‘
V
‘
Charles Erb Wuensch, Saratoga, Calif. ‘
Application“ June 5, 1944, Serial No. 538,794
‘ .7 Claims.
1
This invention relates to‘ impellers, and more
particularly to ?exible resilient blades for the im
pellers of centrifugal pumps.
-‘ Among the objects of the invention is the pre
(01. 103-115)
1
.
‘2
.
composed of sides X—l and X-Z and acylindri
cal bowl .X-—3. It is to be understood that the
impeller and particularly the blades of the pres
ent invention are useful especially in apparatus .
vention of injury to the blades of the impeller Cl where ?uids‘ with abrasive materials‘in suspen
by oversize objects in the flow passing through
sion are circulated or agitated. While: it is‘ pre
the pump which would otherwise damage the
ferred to attach and dispose the blades 2 radially
pump and stop the operation.
from the hub 8, it is to be understood that they
Another object is to provide a blade that will
may extend tangentially from the hub if desired
?ex to permitan‘obstruction to pass and then
as shown in Figures 6 and 7.
be restored to normal operative shape by th
One construction or the blades 2 ‘may be de
centrifugal force of the operation.
'
A further object is to prevent excessive wear
scribed ‘as comprising. a series of spaced metal
wires or- cables‘ 1. arranged in a‘ common plane
of the blades in pumping abrasive materials.
extending in spaced relation substantially across
Further objects are to provide a construction 15 the entireiwidth of the blade 2‘.- The inner ends
of maximum simplicity, economy and ease of as
of the wires I are bent around an anchor key 3
sembly and contemplates such other and further
and maybe bent back upon themselves as at 4,
advantages as will appear to one skilled in the
to reinforce the lowerportion of the blade 2.
art as the description thereof proceeds.
In the event greater strength is desired. for the
Inv attaining the foregoing objects, together with 20 core, the wires or cables can be continued so that
such further bene?ts, advantages and capabilities
the ends of each wire I terminates at the point
as may hereinafter appear and as inherently pos
of beginning. It is preferable, however, to give
sessed thereby, there is disclosed byway of il
thereturning end a lateral twist so that all of
lustration only, the constructions shown in the
the wires I lie in the same plane and do not dou
accompanying drawings. It is to be understood, 25 ble ‘back on each other ‘as shown in Figure 1.- The
however, that the invention is not limited to
outer ends of the wires may have eyelets 5" formed
the examples shown because the same may be
thereon or may be ?attened or left as they are.
embodied in further modi?cations within the
The purpose of ?attening the wires l or forming
spirit of the invention as set forth in the claim
eyelets as ‘shown in Figure ‘2 is to assist‘ in an
followingthe description.
‘
30 choring a weight 5. The weight 5 may be lead
Referring to the drawings:
'
c.
Figure 11s a side elevation of a centrifugal
pump with a portion of the casing broken away
to disclose an impeller having blades constructed
in accordance with this invention.
'
'
Figure 2 is an enlarged longitudinal section of
a. single blade of an impeller.
‘ "
j
Figure 3 is an enlarged front elevational view
of a single blade.
‘
- Figure 4 is an enlarged longitudinal section of
a single blade representing a modi?cation.
Figure 5 is a fragmentary front elevation of a
blade with a portion of the hub in section show
ing a detail of the attachment.
Figure 6 is an enlarged view of an impeller
blade showing tangential mounting and also il1us_
or any other suitable Weight which can be cast
or otherwise maintained around the outer ends
of the wires or cables I. The advantage of cast
ing the weight 5 around the outer ends of the
wires l is to secure the assembly in a perma
nent arrangement which will then form a rein
forcing core for the blade 2. The purpose of
weighting the outer ends of the blades is to give
rigidity at this point and also to stretch the blades
slightly so as to minimize any tendency through
centrifugal action to become larger in cross sec
tional diameter or area at the point of maximum
flexure.
_.
'
_ The external body of the blade 2 which forms
it into a structure having a rectangular horizon
tal section is composed of rubber or other highly
trating the positions assumed during operation
resistant and resilient compound ‘I which ‘can
and at rest.
be vulcanized or otherwise formed around and
enclose the core and weight 5 to make the com-r
‘
‘
Figure 7 is an enlarged view of a variant form
of blade.
‘
‘
Referring now more
particularly to the draw‘
ings, the impeller of the present invention com»
prises a series of radially extending blades 2 which
are securely mounted in or upon a hub 8 rotat
50 plete blade 2.
>
It will be observed that the weight portion 5
imparts a bulbous‘ or streamlined shape to the
outer end of the impeller as shown in Figure 2
and presents a curved impact surface in rest po
lng Within a housing or casing which is generally 55 sition. The shape of the weighted portion in the
2,404,678
5
6
substances and eliminates corrosion when the im
peller is idle.
a ?exible internally reinforced resilient covering
pumps comprising in combination a ?exible core
pass an obstacle and return to its normal state
without stopping the operation of a pump.
6. A ?exible impeller blade for centrifugal
pumps comprising in combination a sac of resil
ient ?exible material adapted to be sealed at its
inner end adjacent the hub to form a closed cav
ity therein, and a free moving weight in said cav
for the blade said structure being capable of mo
In operation the bulblike end of the blade 2
mentary distortion and ?exing to pass an ob
presents an impact surface substantially similar
stacle and return to its normal state without
to that shown in the position I of Figure 1 and
stopping the operation of a pump.
V of Figure 6. However, if the blade is made
4. An impeller for centrifugal pumps com
inclined slightly forward as shown in the broken
prising in combination a hub, and a plurality of
line IV of Figure 4 it will straighten out under
blades ?exible substantially from hub to tip, each
the load of pumping and as a result of centrif
weighted at the outer end to form an enlarged
ugal force. Accordingly it will present an im 10 bulb-like end and each armoured with a resilient
pact surface corresponding substantially to the
?exible coating said structure being capable of
rest position shown in full lines in Figure 1. An
momentary distortion and ?exing to pass an ob
advantage from inclining the position of rest
stacle and return to its normal state without stop
slightly forward resides in the fact that there
ping the operation of a pump.
‘
will be less slip stream loss in the operation.
5. An impeller for centrifugal pumps com
15
In order to completely armour the impeller it
prising in combination a hub, a coating of resil
will‘ be desirable to armour the exposed surfaces
ient armour on said hub, and a plurality of blades
of the hub as shown at ‘Ia. This will protect all
flexible substantially from hub to tip adapted to
of the exposed surfaces with a resilient armoured
be held by said hub and extended outward there
coating and likewise prevent rusting during non 20 from, each weighted at the outer end to form an
operating periods.
enlarged bulb-like end and each armoured with
I claim:
a resilient ?exible coating said structure being
1. A flexible impeller blade for centrifugal
capable‘ of momentary distortion and ?exing to
extending substantially its entire length, a Weight
secured to the outer end of said core to form an
enlaregd bulb-like end, means at the other end
of said core for securing the blade to a hub, and
a ?exible resilient covering for said core and
said weight said structure being capable of mo
mentary distortion and ?exing to pass an ob
stacle and return to its normal state without
stopping the operation of a pump.
nally therein in response to external forces such
as pressure, centrifugal force and distortion said
2. A ?exible impeller blade for centrifugal
structure being capable of momentary distortion
ity adapted to and capable of moving longitudi
pumps comprising in combination a ?exible core 35 and ?exing to pass an obstacle and return to its
extending substantially its entire length, a weight
normal state without stopping the operation of
secured to the outer end of said core to form
a Pump.
an enlarged bulb-like end, means at the other
7. A ?exible impeller blade for centrifugal
end of said core for securing the blade to a hub,
pumps comprising in combination a sac of resil
and a ?exible resilient covering for the entire 40 ient ?exible internally reinforced material adapt
blade said structure being capable of momentary
distortion and ?exing to pass an obstacle and
return to its normal state without stopping the
operation of a pump.
3. A ?exible impeller blade for centrifugal
ed to be sealed at its inner end adjacent the hub
to form a closed cavity therein, and a weight in
said cavity adapted to and capable of moving lon
gitudinally therein in response to external forces
such as pressure, centrifugal force and distor
pumps comprising in combination a ?exible core
tion said structure being capable of momentary
extending substantially its entire length, a weight
secured to the outer end of said core to form an
distortion and ?exing to pass an obstacle and re
turn to its normal state without stopping the op
enlarged bulb-like end, means at the other end
eration of a pump.
of said core for securing the blade to a hub, and
‘
CHARLES ERB WUE'NSCH.
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