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Патент USA US3094608

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June 18, 1963
J. E. wlLDER
3,094,599
SUBMERGED PUMP PROTECTOR
Filed Feb. 19. 19Go
‘
f :l Í
Nom/lay ausm
79
2 sheets-sheet 1
June 18, 1963
J. E. wlLDER
3,094,599
SUBMERGED PUMP PROTECTOR
Filed Feb. 19. 1960
2 Sheets-Sheet 2
`ATTORNEYS
United States Patent O "ice
3,994,599
Patented June 18, 1963
2
1
modiiied form of pump control circuit into which the
3,094,599
control of the present invention may be integrated.
FIG. ll -shows a further modiiied schematic wiring dia
SUBMERGED PUMP PROTECTOR
Justin E.-Wilder, Goshen, Ind., assignor to Penn Controls,
Inc., Goshen, Ind., a corporation
Filed Feb. 19, 1960, Ser. No. 9,776
4 Claims. (Cl. k200m-122)
gram utilizing the present invention .
Referring initially to FIGS. l, 3-7, the ñow respon
sive portion of the control will be >initially described.
The control includes a body or ñtting 10 which is thread
ed at its lower end for insertion into a T-iitting (not
This invention relates generally to apparatus for use
with `water pumps operated while submerged in wells
shown) incorporated in the discharge line of a submerged
pump. The central bore or cavity 11 within the body
10 thus communicates with the discharge line of the
pump. The upper end of the cavity 11 is enlarged to
and ink particular to a safety apparatus forshutting Vdown
the pump when abnormal conditions exist within the Well.
In cert-ain Well'installations, the pump for delivering
provide `a shoulder 12 from which ex-tends an annular
water at the well-head is physically located within the
well and operates submerged below the water level in the
well. An installation of the type referred to is disclosed
in Armstrong et al. No. 2,577,559. The pump .is de
boss 13.
Clamped against the boss is a ilexible diaphragm
14 which extends across the cavity and seals its upper
end. A plug 16 -t-hreaded into the member 10 bears
against a washer 1'7 having a tongue 17a extending from
its margin and into -an aperture 18 in the body 10. In
terposed between the diaphragm and the washer 17 is a
signed so as not to overheat when so submerged, how
ever, should t-he water table fall to an abnormally low
level, for example, operation of the pump unsubmerged
for even a relatively short period will cause damage ne
cessitating removal of the pump from the well for re
trunnion bearing washer 19.
yAn elongated element, indicated generally at 21, formed
pair or replacement. In the submerged-type pump installa
tion the pump is usually `controlled by a conventional
extends through a suitable aperture in the diaphragm.
of a lower section 22 and an upper hex-sided section 23,
pressure switch which responds to variation in pressure
within a pressure tank connected between the pump dis
charge and the water service line. Should the pump
fail to `deliver water to the tank because of, for example,
abnormally low water table conditions, the pressure switch
will continue to operate the pump resulting in the dam
30
age previously referred to.
The presentinvention provides a control which shuts
The upper end of the section 22 is threaded-and is re
ceived within the threaded bore formed in the upper sec
tion 23. The lower end of the section 23 bears against
a trunnion bearing 24. The bearing 24 is provided
with sidewardly yextending tabs 24a which »are coni-ined
by trunnion bearing washer 19, plug 16 and notches in
two sides of locating washer 17. The elongated element
21 thus extends’through the base plate 31 of the switch
ing enclosure 32. -The diaphragm serves to seal the en
down’the pump a timed period `after it is started by the
closure 32 from the body 10, but permits the transmis
conventional pressure control if, and only if, no water is
sion of mechanical motion of the element 2‘1 into the
delivered to the pump discharge line.
An object of the present invention is to provide a pro 35 switching enclosure. As may best be seen in FIGS. 1
and 8, the lower end of the section 22 is curved some
tective control for submerged pumps which functions to
what and has attached thereto by means of screw 34 a
shut down the pump a predetermined time after it has
iloW-intercepting plate 36.
started, the shut-down function being disabled if water
Referring. particularly to‘FIGS. 1-6, the switching com
at the required ñow-rate is delivered by the pump within
the predetermined period.
40 ponents of the ycontrol will now be described.
The en
acterized by relatively rapid response and relatively large
closure 32 is formed by the base plate 31 and integral side
members 37 and 38. A cover member (not shown) may
`be snapped over the Vertical, spaced side members 37 and
rectilinear movement of its output member for a given
38. A generally U-shaped lining of flexible insulating
a thermal motor of the type referred to` which is com
23 of the elongated element 21 receives a screw 41 which
>clamps to thesection 23 a switch operating arm 42.
Riveted to the sidewardly extending end of the arm 42
-is an extension 43 formed of insulating material. The
free end of the extension 43 overlies thefree end of a
A further object of the present invention is to provide
a thermal motor or warp `element assembly which is char
45 material 39 may be positioned within-the enclosure. As
temperature variation.
may best be seen in FIG. 3, the upper end of the section
A furthery object of the present invention is-to provide
pensated fory changes in ambient temperature.
The full nature of the invention will be understood
‘from the accompanying drawings and the following de
scription and claims:
>resilient switch blade 44. A tab 46, integral with the
arm 42 and extending through »the extension 43, serves
removed.
55 to retain 'a compression spring 47 whose lower end bears
against the base plate 31.
FIG. 2 is a top plan »view with the upper switch hous
FIG. 1 is a side view of the control apparatus of the
present invention with-a portion of the switch enclosure
îing removed.
The resilient blade 44 carries a switch contact 48
which cooperates with a further switch contact 49 car
FIG. V3 is a sectional »view taken generally along the
ried Kby a switch arm 51. The blade 44 and arm 51 are
line 3-3 of FIG. 1.
FIG. 4 is a side view of the thermal operator assembly. 60 supported in spaced ‘relation by stacked insulating mem
bers 52 clamped together by means of -screws 53. The
FIG. 5 is a top plan viewof one of the bimetal strips
ends >51a and 44a ofthe arm and blade provide suitable
terminals for the connection of appropriate wiring. The
FIG. 6 is a top plan view of the electric heater forming
blade 44 is provided with an inherent bias which urges
a part of the thermal operator assembly.
FIG. 7 is an enlarged end sectional view of a portion 65 the ‘contacts 48 »and l49 into closed position. As will be
apparent »from FIG. 1, the spring 47 urges the arm 42
of the control.
upwardly and »consequently urges the plate 36 into its
FIG. 8 is an end view of the lower portion of the con
extreme righthand position as shown in FIG. 1. When
trol.
FIG. 9 is -a schematic wiring ‘diagram showing the con 70 water flowing through the pump discharge line itnpinges
.on the plate 36, the plate will be moved leftwardly as
trol integrated into a pump control system.
viewed in FIG. 1, causing the extension 43 to move down
FIG. 10 is a schematic wiring diagram illustrating a
incorporated in the thermaloperator assembly.
3,094,599
wardly to displace the blade 44 and open the contacts 48
and 49.
thermal operator by the bimetal strips 62 and 64. These
Extending vertically 4from the base plate 31 are station
ary posts 56 and 57 which are enlarged at their lower end
change the motion provided by strips 67 and 78 is can
celled by motion in the reverse direction by strips 62 and
to provide retaining shoulders 56a and 57a. Extending
upwardly from the base plate 31 is a post 58 whose shank
is threaded, the post being threaded through a suitable
relatively stable for variations in ambient tempera-ture.
’Ihe time delay occuring between energization of the
strips are arranged so that upon ambient temperature
64.
The position of the thrust pin 79 is thus retained
heater 71 and the desired motion of the pin 79 is thus
aperture in the base plate 31 with its screwdriver slotted
relatively independent of the ambient temperature condi
head (not shown) kaccessible from the exterior of the
switching enclosure. A lock nut 59 serves to clamp the 10 tions at the mounting location of the control.
Extending between the side members 37 and 38 in
post S8 in adjusted position. The unthreaded, reduced
overlying relation to the thermal `operator assembly is a
diameter, upper end 58a of the post extends freely through
normally closed switch 8-1. The switch is disposed with
an aperture 61 in the ñrst lbimetal strip 62, shown in
in an enclosure of insulating material and, since it forms
detail in FIG. 5. The bimetal -strip is provided with
tongues 61a which extend out of the plane of the strip 15 no part of the present invention, its specific construction
is not disclosed in detail herein. The thrust pin 79 eXand is provided also with apertures 60 and 63 which
tends into the switch housing and functions to operate
freely accommodate the posts 57 and 56, respectively.
the switch to open position when moved upwardly by the
Overlying the strip 62 and spaced therefrom is an
thermal operator.
identical second bimetal strip 64 which is provided with
apertures freely accommodating the posts 56 and 57 and 20 Referring to FIG. 9, a typical circuit incorporating the
control of the present invention will be described. The
power input terminals `82 and 83 are connected to one
side of a double pole throw switch indicated generally at
the two strips in spaced relation. rIhe upper tip of the
84. The switch 84 is a conventional pressure switch
post 58 extends freely into the `central bore of a ilanged
member 66. 'Ihe upper end of the member 66 bears 25 operated by a pressure responsive element, indicated
the reduced end 58a of the post 58. The tabs 61a and
the `counterpart tabs formed on the strip 64 serve to hold
against the lower face of a third bimetal strip 67 which
is identical to the strip 62 except that it need not be pro
schematically at 86 which responds to the pressure in the
pump system pressure tank. The function of the pressure
vided with a central aperture since the member 66 merely
switch is to close the circuit to the pump motor 87 when
material, the assembly being clamped together by means
40 and the heater 71 will be energized. Within a timed peri
ever the pressure in the pressure tank falls below a prede
bears against, but does not extend through, the strip 67.
Overlying the strip 67 is a wi-re wound electric heater as 30 termined point and to open the circuit to the pump motor
whenever the pressure in the pressure tank reaches the
sembly indicated generally at 68 «and shown in detail in
desired value. Also connected in the circuit to the pump
FIG. 6. The heater assembly includes a iìbreboard strip
motor
87 is the double pole, double throw, normally
69 having a wire wound electric heater 71 disposed there
closed switch 81 which is a component of the control of
on. Terminals 72 permit electrical connection to opposite
ends of the heater and the terminal 73 permits electrical 35 the present invention. The thermal operator 68 is in
dicated schematically in FIG. 9. Between the switches
connection to the midpoint of the heater. This arrange
81 and 84 there is interposed the electric heater 71 and in
ment is thus such that the heater may be used on either a
series circuit therewith the switch 48-49. When the
l0() volt or a 220 volt power source. Enclosing the heater
pressure
switch `84 is closed the pump will be operated
and the strip 69 is an envelope 74 of flexible, heat resistant
of brass sleeves or eyelets 76 and, as may best be seen
in FIG. 4, the eyelets have substantial mass so as to
provide thermal conduction to the strip 67 and the over
od after energization of heater 71, the thermal operator
68 will open the switch 81 to shut «down the pump.
This action of the thermal operator will occur unless,
within the timed period, the desired water flow is achieved
lying fourth bimetal strip 78. The strip 78 is identical to
the strip 62 except that a thrust pin 79 is rigidly secured 45 at the pump discharge line. Under normal operating
conditions, the water iiow will move the plate 36 to open
thereto and extends vertically from the upper face of the
strip.
contacts 48-49 prior to ‘opening of the switch 81 by
the thermal operator. Should the ñow through lthe pump
As may be seen in FIG. 2, the thermal operator or warp
discharge line `fail to occur within the timed period, the
element assembly is disposed at «an angle with relation
heater 71 will remain energized and the thermal operator
to the longitudinal axis of the switch enclosure 32, how 50 lwill
hold the switch 81 open, maintaining the pump shut
ever, this assembly is shown in a full side view in FIG. 4.
down.
In FIG. 4, arrows are shown indicating the directions in
Referring to FIG. 10, a somewhat modiñed circuit is
which the bimetal strips move when their temperature is
schematically
disclosed. This circuit is similar to that of
raised. Strip 62 and the strip 64 have their high expan
FIG. 9 and the components are given the same refer
sion sides facing each other, while the strips 67 and 78 55 ence
numerals. It is distinguishable from the circuit of
have their low expansion sides facing each other with the
FIG.
9 in that the heater 71 is connected to the power
heater assembly 68 interposed therebetween. The posts
input lines between the switch 81 and the pump motor
56 and 57, extending through the ends of the strips, serve
87. In this arrangement when the thermal operator 68
to confine the free ends of the strips against sideward
opens the switch 81, the heater 71 is deenergized and
movement. Thus, upon energization of the electric 60 upon
the subsequent cooling of the bimetal strips, the
heater "71, the strip 78 will bow upwardly so that its
switch 81 is reclosed. The pump motor is thus restarted
upper face is convex and the strip 67 will bow so that
or recycled after a shutdown by the thermal operator.
its lower face is convex. With the center of strip 67
The circuit of FIG. ll is the same as that shown in
held ñxed in position by the member 66 the upward
FIG.
10, however, the thermal operator is arranged so
movement of the ends of the strip 67 will raise the ends 65
that
when
heated, it assumes a position opening switch
of the strip 78. The upward movement of the central
81 but cannot reclose the switch 8-1 upon cooling. A
portion of the strip 78, as a result of its assuming a bowed
push button 91 schematically illustrates a means for re
conñguration, serves to move the thrust pin 79 upwardly
turning the thermal operator to its cold position to reclose
and this motion of the pin 79 will have a magnitude which
is the sum of motion components provided by warping 70 the switch 8-1. The lockout feature of the circuit of
FIG. 9 is electrically maintained, while that of FIG. 11
of the strip 67 and of the «strip 78. When the heater 71
is mechanically maintained with the push button 91, or
is de-energized, the resulting lowering of the temperature
of the strips 76 and 78 causes the thrust pin 79 to re
a similar reset means being available for manually re
treat downward-ly.
closing of the switch 81.
While the invention has been disclosed and described
Ambient temperature compensation is provided for the
3,094,599
5
in some detail in lthe drawings and foregoing description,
said thrust pin substantially independent of ambient tem
they are to be considered as illustrative and not restrictive
perature change.
3. A thermally responsive operator comprising iirst and
in character, as other modifications may readily suggest
broad scope of the invention, reference being had to the
second bimetal strips disposed in stacked relation with each
other, a thrust member extending centrally from the outer
appended claims.
face of the said second element, a third and fourth bimetal
themselves to persons `skilled in this -art and within the
The invention claimed is:
1. A thermally responsive operator comprising iirst and
strip disposed in stacked relation with each other, said
.thrust member centrally engaging the outer face of said
second bimetal strips disposed in stacked relation with each
third strip, an electric heater disposed in heat exchange re
other a thrust member extending centrally from the outer 10 lation with said third and fourth strips, said first and second
bimetal strips having their high expansion sides facing each
face of the said second element, a third and fourth bi
metal strip disposed in stacked relation with each other,
said thrust member centrally engaging the outer face of
said third strip, an electric heater interposed between
other, said third and fourth bimetal strips having their low
expansion sides facing each other, and means confining the
free ends of said strips against sideward movement, where
said third .and fourth strips, a thrust pin extending cen 15 by upon energization of said heater said third and fourth
trally .from the -outer face of said fourth strip, said first
bimetal strips assume a bowed configuration, said ñrst
and second bimetal strips having their high expansion
and second bimetal strips serving to maintain the work
sides facing each other, said third and yfour-th bimetal
output available at the central portion of said fourth strip
strips having their low expansion sides facing each other,
substantially independent of ambient temperature change.
and means confining the free ends Áof said strips against 20
4. A thermally responsive operator comprising two bi
sideward movement, whereby upon ‘energization of said
metal strips disposed in stacked relation with each other,
heater said third and fourth bimetal »strips assume a
an electric heater interposed between said strips, a thrust
bowed configuration and thereby move said thrust pin
pin extending centrally from `the outer face of one of said
rectilinearly, said fir-st and second bimetal strips serving
strips, said bimetal strips having their low expansion sides
to maintain the Work output available at said thrust pin 25 facing each other, means coníining the free ends of said
substantially independent of ambient temperature change.
strips against sideward movement whereby upon ener
2. A thermally responsive operator comprising iirst and
gization of said heater said bimetal strips assume a bowed
second `bimetal strips disposed in stacked relation with
configuration with their convex faces outward and thereby
each other, a thrust member extending centrally from
move said lthrust pin rectilinearly, and means for varying
lthe outer face of the said second element, a third and 30 the position of the central por-tion of the other of said
fourth bimetal strip disposed in stacked relation with each
strips in response to ambient temperature changes.
other, said thrust member centrally engaging the outer
References Cited in the tile of this patent
face of said third strip, an electric heater disposed in heat
exchange relation with said third and fourth strips, a
UNITED STATES PATENTS
thrust pin extending centrally from the other face of said
406,152
Sturtevant ____________ __ July 2, 1889
fourth strip, said ñrst and second bimetal strips having
1,784,205
Seeger _______________ „e Dec. 9, 1930
their high expansion sides facing each other, said third
1,814,812
Klees et al ____________ __ July 14, 1931
and fourth bimetal strips having their low expansion sides
1,834,375
Bletz ________________ _e Dec. 1, 1931
facing each other, and means confining the free ends of
Appelberg ___________ __ Jan. 17, 1933
said strips against sideward movement, whereby upon 40 1,894,842
1,980,799
Hardesty ____________ „_ Nov. 13, 1934
energization of said heater said third and fourth bimetal
strips assume a bowed configuration and thereby move
said thrust pin rectilinearly, said ñrst and second bimetal
strips serving to maintain the work output available at
2,207,422
Vaughan et al __________ __ July 9, 1940
2,698,368
2,830,157
Lehr et al ____________ __ Dec. 28, 195‘4
Patti ________________ „_ Apr. 8, 1958
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