CA1103990A - Through flow sump pump - Google Patents
Through flow sump pumpInfo
- Publication number
- CA1103990A CA1103990A CA308,077A CA308077A CA1103990A CA 1103990 A CA1103990 A CA 1103990A CA 308077 A CA308077 A CA 308077A CA 1103990 A CA1103990 A CA 1103990A
- Authority
- CA
- Canada
- Prior art keywords
- pump
- pipe
- motor
- size
- reducer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Abstract
218-13.01 ABSTRACT OF THE DISCLOSURE
A sump motor is mounted in a section of pipe. The motor is a standard motor having special caps at each end of the motor shell and with the shell forming a waterproof en-closure. The caps have radially extending spacers extending out to the pipe. At each end of the pipe are reducers, the internal diameter of the small ends of which correspond to the external diameter of another, smaller standard pipe size. At the bottom a piece of pipe of the smaller size extends inwardly of the reducer to a location in juxtaposition to the pump im-peller. Various connections and mounting arrangements may be made using standard sizes of pipe. In one embodiment the pump is mounted on a vertical track and positioned above a sump.
When the water rises to a level in the sump at which pumping should commence, the motor is energized and the pump is lowered along the track into the sump.
A sump motor is mounted in a section of pipe. The motor is a standard motor having special caps at each end of the motor shell and with the shell forming a waterproof en-closure. The caps have radially extending spacers extending out to the pipe. At each end of the pipe are reducers, the internal diameter of the small ends of which correspond to the external diameter of another, smaller standard pipe size. At the bottom a piece of pipe of the smaller size extends inwardly of the reducer to a location in juxtaposition to the pump im-peller. Various connections and mounting arrangements may be made using standard sizes of pipe. In one embodiment the pump is mounted on a vertical track and positioned above a sump.
When the water rises to a level in the sump at which pumping should commence, the motor is energized and the pump is lowered along the track into the sump.
Description
2 18 - 13 , 0 1 ECV~ ls 1~39~
BACKGROUND AND S UMMARY OF THE INVENT ION
While the present invention is primarily concerned with emergency sump pumps, features thereof can be utilized in pumps for other purpose~.
Two important requirements of emergency sump pumps are that they be reliable, that is, they perform when required, and that they have high performance. For example, when storm water is accumulating in a sump, it is very important that that water be removed to prevent the damage that would otherwise be caused by the water overflowing the sump. Since such emergency pumps are operated only infrequently the existence of a con-dition which would cause pump failure may not be detected until the emergency occurs. Thus the feature of reliability is most significant. When the emergency occurs, water may be entering the sump quite rapidly, thus the necessity for high performance.
~ nother important attribute for a sump pump is that of adaptability to a wide variety of installation requirements.
The configuration, size, etc., of the sump will be different in almost every instance. In fact, in some in~ftances the base-ment floor drain may be the structure that might be referredto a~ the sump. Also, the pump capacity, the type of electric power to be employed, etc., will vary from job to jbb. To meet the varied requirements with a minimum of inventory, it is im-por~ant to the pump supplier to have pump components which can ;~ be varied to meet the requirements of a particular job. Thus, ox example, on one job the puxchaser may want to use a 12 volt . . .
; motor powered by a standby battery while on the next job a per~on may want to utilize 110 volt house current. If the supplier can merely interchange basic electric motors, and render them wat~rproof and utilizable with the other pump ;. -2--.
2 18-13 .01 ECV~ ls 39~0 components, it is not necessary that the supplier stock every type of pump that might be required. This is only illustrative and the same applies to other components necessary to satisfy various installation requirements.
As is almost always the case, the element of cost -also is an important factor to be considered. The business is a competitive business and where the manufacturing cost of the emergency sump pump is high, it may be that the product cannot be sold in competition with units of other designs. For example, 10many sump pumps utilize special castings for the pump, etc.
Thus, the object of the present invention is to pro-duce a versatile, relatively low cost emergency sump pump which will have a high degree of reliability. Various features of the present invention contribute toward this end. For example, standard electric motors of diverse electrical characteristics (voltage, power, etc.) are converted into waterproof motors by substantially only the addition of a pair of end caps. These end caps also provide the necessary standard mountings for mating with the other pump components. This waterproof motor i9 then mounted inside a length of pipe of a standard size Reducers .
on each end of that }ength of pipe provide for the adaptability of the pump to mate with other standard ~izes of pipe utilized for the intake and discharge connections. At the intake end provlsion is made for the mounting of a screen when desired, which screen is formed from a standard length of pipe and also may serve as the pump support.
An important f~ature of the invention is that the water ~eing pumped flows about the motor shell. Thu9 when in use, the motor is constantly being cooled by that water. This increases the efficiency and permits the motor to be worked at a capacity that otherwise might cause excessive heating. The .:
_3_ .
218-13.01 ECV:ls 11~`35~9V
spacers used to position the pipe through which the water is flowing serve as cooling fins. This arrangement) in conjunction with the type of impeller employed, also prevents the downflow of water which occurs9 in the absence of a check valve, when the motor is turned off from causing an undesired, and undesirable, rotation of the motor. Pumping efficiency also is assisted in one embodiment by providing a readily accessible adjustment by which the spacing between the inner end of the intake tube and the impeller may be established after assembly.
Embodimen~s of the invention are relatively small and lightweight considering their pumping capacity. Their structure is such that maintenance is easily performed, both in the shop and in the field.
In one embodiment the pump is mounted externally of the sump and provision is made for automatically dropping the pump into the sump when the necessity for water removal occurs.
other features of the invention will be mentioned and will be apparent from the following description of specific embodiments.
DESCRIPTION OF THE DRAWINGS
Figure 1 is an elevational view of an embodiment of the invention positioned in a sump;
Figure 2 is an exploded view of the pump embodiment of Figure l;
Figure 3 is a longitudinal section through the em-bodiment of Figure l;
Figure 4 is an elevational view of the pump of Figure 1 installed in a floor drain or the like;
Figure 5 is a view as seen at line 5-5 of Figure 3;
Figure 6 is an elevational view of an embodiment . -4-- . - . . , ~ ~
218--13.01 ECV:ls 11~3990 wherein the pump is held outside of the sump until it is neces-sary that the water removal occur;
Figure 7 is a view as seen at line 7-7 of Figure 6;
Figure 8 is a schematic of the electrical control apparatus for the embodiment of Figure 6;
Figure 9 is an elevational view, with portions broken away, of another embodiment; and Figure 10 is a longitudinal section of the lower por-tion of the embodiment of Figure 9 illustrating an additional standpipe conne~tion added thereto.
DESCRIPTION OF SPECIFIC EMBODIMENTS -The following disclosure is offered for public dis-semination in return for the grant of a patent. Although it is detailed to ensure adequacy and aid understanding, this is -not intended to prejudice that purpose of a patent which is to cover each new inventive concept therein no matter how others may later disguise it by variations in form or additions or further improvem~nts.
The pump motor, generally 10, comprises an electric 2Q motor of standard manufacture to which two caps and seals have been added to produce a waterproof motor. The term "waterproof"
is used herein to signify that under normal operating conditions water will not enter the motor. Such a standard electric motor comprises an armature 11 mounted on a shaft 12. For use in ,~connection with the present invention, it is desirable that the shaft be stainless steel. It has a frame formed by a cylindri-cal shell 13~ two end plates 14, and threaded rods 15, with nuts at the upper ends which hold the end plates seated against the ends of the shell. The end plates form mountings for the shaft bearings 16. Mounted in the frame is the field coil 17 and, ,, .
..
218-13.01 ECV-ls 11~39~
where appropriate, the mountings for the brushes (not shown~
supplying the electrical connection to the armature. The motor shown is purely for the purposes of illustration and in actual practice it may be one of a variety of known types of electric motors of diverse electric power supply requirements and output capacities.
To such a motor I have added two end caps 20 and 21.
These caps are bronze castings and have skirts 22 and 23; res-pectively, which extend about shell 13 in juxtaposition there-to. o-rings 24 provide a fluid seal between the end caps and the motor shell 13 thereby forming a fluid-tight motor housing.
The lower end cap has an integral nose 26 with an opening 27 through which the shaft 12 extends. At the distal end of the nose are an o-ring 28 and shaft seals 29 and 30 to prevent fluid from entering about the shaft. The o-ring blocks water from flow-ing between the outside of the shaft seals and the cap 21. It ; often is preferable to put the o-ring between the two seals to hold it securely in place.
Cap 20 has a threaded bore 31 in axial alignment with each of rods 15. At the base of each bore is a wall 32 through which the rod extends. The rods are screwed into threaded blind holes 33 in cap 21. Pipe caps 34 are 8 crewed into the threaded bores 31 to prevent fluid from entering into the motor about the rod~ 15.
Coaxial with the motor shaft there is a threaded bore 36 in cap 20. An electrical fitting 37 is mounted in this bore.
It has a compression cap 38 about a rubber insert (not shown) through which the motor wires 39 extend. Whan the cap is tightened onto the fitting, it compresses the rubber insert about the wires to prevent any entry of fluid thereabout into the motor. The upper end of motor shaft 12 has a screwdriver slot 35 permitting the shaft to be rotated by a screwdriver B
218-13.01 ECV-ls 11~399~) inserted through bore 36 after fitting 37 (or the rubber insert thereof) has been removed.
A plurality of bosses 41 ana 42 project radially outward frc~ caps 20 and 21, respectively, to contact the interior of a pipe 43 which defines the motor and pump chamber 44 between the two reducers S0 and 51 to accommodate the motor 10 and the pump impeller 73. These bosses serve as spacers to position the motor from the inside of the pipe walls so that there is a water passage-way around substantially the circumference of the motor, in that part of the motor and pump chamber 44 between the motor and the -pipe. While there are four such bosses on each cap in the illustra-ted embodiment, the number and positioning will depend upon the de-sires of the manufacturer. At least some (the number depending up-on the preferences of the manufacturer) of the bosses have blind, ; tapped openings 45 extending radially inward from the distal end of the boss. Screws 46 are inserted through openings 47 in pipe 43 and screwed into openings 45 to af~ix th~ motor in the pipe.
; Some manufacturer~ may desire to originally form bosses 41, 42 with a relatively long radial dimension. The bosses of some caps are thereafter cut off to a length to conform to the internal radius of one size of pipe and others to conform to the internal radius of another pipe 8 ize.
one feature of the embod$ment of Figures 1-4 is that many of the components of the complete pump are formed of stand- `-ard sizes of plastic pipe. Thus, for example, the main pipe 43 is a length of "four inch" plastic pipe forming a pump shell.
That is, it has a four inch internal diameter and a four and one-quarter inch e.:ternal diameter. In such instance the distance from the axis of the motor, as represented by shaft 12, to the distal ends of the bosses 41 and 42 i5 two inches. The pipe used is polyvinyl chloride. The smoothness of the pipe and the finished pump makes it easy to clean and there is little problem .
218-13.01 ECV:ls ~i~39~0 with a buildup of debris thereon.
At each end of the main pipe 43 are reducers 50 and 51. In the illustrated embodiment, these are identical, but this need not necessarily be the case. Reducer 50 comprises a large cylindrical sleeve 52, a truncated conical section 53 and a small cylindrical sleeve 54, all as a unitary section.
Large sleeve 52 telescopes into the end of main pipe 43, and thus has an external diameter corresponding to the internal diameter of the pipe (four inches in the example given). The internal diameter of the small ~leeve 54 is such as to tele-scopically receive a piece 56 of pipe of another standard size, smaller than that from which pipe 43 was formed. In the example given, pipe 56 is a piece of ione and three-quarter inch" plastic pipe; i.e., having an internal diameter of one and three-quarter inches and an external diameter of one and seven-eighths inches. Thus the internal diameter of sleeve 54 is one and seven-eighths inches.
Reducer 50 is suitably secured to pipe 43. In the illustrated embodiment this is done by use of an adhesive, but other faqtening means might be employed. Pipe 56 i~ Q imilarly affixed to reducer 50. Pipe 56 forms a part of the discharge passageway for the liquid being pumped. It i9 connected to another pipe 57 (metal or pla~tic) o~ a similar Qize and lead-~; ing to a suitable di~charge point. This connection is formed by a piece of rubber hose 58 which is secured to pipes 56 and 57 by means of hose clamps 59. In the conventional manner the hose clamps have means, not shown, for tightening the clamps about the hose.
The distal snd of pipe 56 has a slot 61 formed in one side thereof, in the illustrated embodiment this slot beingformed by beveling th- end of the pipe. Adjacent this slot are .
218-13 .l ~-~v ls ~i~39~9() two holes 62 in hose 58. The wires 39 from the motor extend through this slot and through the holes 62, the fit of the hose about the wires being sufficiently tight to prevent water leak-age at that point. Because of the slot 61 it is not possible for the installer to pinch wires 39 when connecting pipe 57 to the pump. Pipe 57 will abut the apex of the tapered end of pipe 56 and thus prevent the wires from being pinched.
Similarly, reducer 51 i5 a unitary element made up of a large cylindrical sleeve 64, small cylindrical sleeve 65 and a truncated conical section 66 therebetween. The external diameter of the large cylindrical sleeve 64 is such as to tele-scope within main pipe 43. The internal diameter of the small cylindrical sleeve 65 is such as to telescopically receive a piece of pipe 67 of another of the standard sizes; in the ex-ample given, it being a one and three-quarter inch pipe. The large cylindrical sleeve is removably affixed to the main pipe 43. In the illustrated embodiment this i~ done by means of screws 68 which extend through openings 69 in main pipe 43 and , are threaded into opening~ 70 in the reducer 51. An O-ring 71 forming a seal is seated in a groove in sleeve 64 at the end of main pipe 43.
Pipe 67 serves as the intake conduit ~or the pump.
It extends to within a ~hort distance of the pump impeller 73 and is coaxial therewith. It frictionally engages sleeve 65 , and thus can be adjusted with respect to the impeller. A
plastic pipe coupling 74 is slipped onto the external end of . ~, he pipe 67. In some embodiment~ the small cylindrical sleeve ; ~ 65 would be extended axialIy for a sufficient di~tance to serve the function of the separate coupling 74, which would then be eliminated. A draw pipe 75 of the desired length, etc., is fitted into coupling 74 in the field. The slanting of the bottom . ~
_g_ 218-13.01 ECV:ls 39~
of the draw pipe ameliorates the problem of accidental blockage of the intake opening. Were it desired to pump down to a Low level in the pit the bottom of the draw pipe would be normal to the axis of the pipe (as is draw pipe 75').
Impeller 73 comprises a flat plate 77 which effec-tively covers the end of opening 27 in the motor and prevents water from being forced directly at the seals 28-30. Extend-ing downwardly from plate 77 are a plurality of vanes 78. Motor shaft 12 extends into a hub 79 of the impeller. A stainless steel screw 80 extends through the hub and is threaded into the motor shaft to hold the impeller onto the shaft. Since the down flow of water which occurs when the motor is deenergized does not tend to rotate the impeller there is no danger of the screw unscrewing by reason of such a reverse rotation.
For some installation~ it is de~irable to have a screen about the pump draw pipe to prevent floating debris from entering the draw pipe. Such a screen i5 formed by a second length 81 of a pipe of the same size as that of main pipe 43; in the example given, it being four inch pipe. This second length of pipe has a plurality of openings 82 in the lower part thereof. These openings are sufficiently small to prevent the normal debriq from entering the screen pipe 81. A
suitable size is ~even-sixteenths inch in diameter. The screen pipe 81 slips onto the exposed portion of sleeve 64 of the `~ bottom reducer and is held in place by friction. The holes are .i ; adjacent one end of the screen pipe. Thus by reversing the screen pipe end-for-end, the ~creen may be positioned high or low in the sump to accommodate different installation require-ments.
; 30 By way of illustrating the various ways in which embodiments of the invention may be employed, reference may .
~18-13. 01 ECV: ls 3C~
be first made to Figure 1 which shows a sump 85 in which water 86 may accumulate from time to time. This sump is, for example, a pit in a basement floor 87 and has a bottom 88. If it is de~ired to have the pump be self-~upporting on the bottom of the sump, a plurality (e.g., three) of ru~ber feet 90 may be affixed to the bottom of the screen pipe 81. These feet are items such as crutch tips or chair leg tipq in which there is a slot 9l. The slot is of such a width that the upper part of the feet will slip over the screen pipe 81 and be frictionally secured thereto. Thus the pump is supported on the pit bottom 88 with the screen pipe 81 spaced a short distance from the bottom of the Qump. The discharge pipe 57 connected to the top of the pump will ensure that the pump does not upset within the sump.
Alternatively, the pump may extend through a floor plate 93 covering the top of the sump. A ring 94 secured to the main pipe 43 and resting upon the floor plate 93 may be used to su~pend the pump within the aump. In that event, it is ;~ not necessary for the bottom of the pump (or the feet 90) to ~20 bear against the bottom of the sump. The ring 94 may be of elastomeric material, frictionally engaging the main pipe 43.
The connection to pipe 57 will also bear ~ome of the weight of ; the pump in addition to the ~upport provided by ring 94.
Figure 4 illustrates the manner in which the pump may ~ be employed much in the form of a standpipe to prevent a back ,~ flow in a floor drain 96 or the like in a basement floor 87. In this instance a d~raw pipe 75' having a straight bottom is in-serted into coupling 74. It projects through an opening in an elastomeric gasket 97 which is placed in the cavity intended to . .
~11-:
:
2 18-13 . ol ECV: ls 1~(~3gg~
hold the floor plate of the floor drain, If water begins to back up into the floor drain 96 the pump may be turned on ~manually or automatically) to remove that water to another location for discharge.
Figures 6 and 7 illustrate the manner in which the pump is employed, when it i9 desired that the pump normally be out of the water except when it is in use, thereby preventing any deleterious action to the pump as a result of its standing in the water. A vertical track lO0 defining a vertical way i8 mounted adjacent the sump 85. In the illustrated embodiment this track is formed by a pipe secured to a floor plate lOl.
The floor plate is suitably attached to the floor 87 as by means of bolts 102. A carriage 103 is vertically movable along the track 100. This carriage comprises a ring 104 which en-circles pipe 100, an arm 105 extending out from the ring and a 8 addle I06 on the end of the arm. Screws 107 extend through openings in the saddle and are threaded into the main pipe 43 to support the pump in the saddle. The ring 104 is free to slide up and down the pipe 100. In some embodiments vertical ; 20 guides may be employed to prevent the rotation of the ring about the pipe, and ball bearings or other antifriction means may be employed to ensure that the carriage move~ easily along its track.
An electric latch llO i9 secured to a mounting ring lll. Ring lll has thumbscrew~ 112 to engage track lO0 to fix the ring's position on the track. The electric latch 110 is imilar to the electric latches commonly uQed to prevent a door from opening except when the latch is energi~ed. It includes a tongue 113 which i~ outwardly spring bia~ed and iq retracted inwardly when a solenoid in the latch is energized. A support 114 is secured to arm 105 of the carriage and has a finger 115 ,~ :
. : . . : ,. . .
218-13.OL
~CV: 1~
~i~399(~
which hooks over tongue 113 to normally support the carriage, and thus the pump3 in the full line position illustrated in Figure 6. When the solenoid of latch 110 i5 energized, thereby retracting tongue 113 from below the finger 115, the carriage 103 is released to descend along track 100. A rubbex bumper 116 is placed about track 100 at the bottom thereof to cushion the descent of the carriage. Counterweights may be employed if desired to slow the descent of the carriage and pump along the track. A flexible hose 117 serves as the discharge conduit for the pump and i5 sufficiently long to permit movement of the pump between the raised and lowered positions. It is affixed by being clamped within hose 58 (or it may be clamped directly to pipe 56 in place of hose 58). Wires 39 to the motor also are sufficiently long to permit the vertical movement of the pump.
The controls for the pump are in a control box 119 at a suitable location, aq for example atop the pipe track 100.
These controls include a sensor for determining when the water 86 rises to a level within the sump such that the pumping should commence. A part of this sensor is positioned in the sump. In the illustrated embodiment, the sensor i8 pneumatically operated and the part thereof within the QUmp COmpriQes a bsll 120 having an open bottom. The interior of the bell communicateQ with a tube 121. This tube is used to suspend the bell within the sump. Thus, a portion of the mounting plate 101 extends over the sump and the tube 121 passes through that portion.
A clamp 122 is placed about the tube at a location at which the bell 120 will be suspended at a height such that a `i sensor will signal the controls when the water has risen to a level such that pumping should commence. Thus assume that the line 123 repre~ents the elevation selected for the commencement `
.
218-13 .01 ECV:ls ~i~3~90 of the pumping operation. The bell 120 is suspended so that its bottom open end is below the level 123. As the water rises ahove the bottom end of the bell, air is trapped in the bell and as the watex level continues to rise, the air pressure in the bell correspondingly increa~e~. This air pressure i~ trans-mitted through tube 121 to a pneumatic pressure detector.
The control apparatus is schematically illustrated in Figure 8. The pneumatic detector compriseC a housing 125 across which is a diaphragm 126, the two defining a pre~sure chamber 127. Tube 121 communicates with this chamber. As the pressure in the bell 120 increases the diaphragm 126 is moved outwardly, first closing switch 128 and with a further increase in water level then closing switch 129. Such an air pressure detector apparatus which will actuate different switches at different pressures is disclosed in my pending U. S. patent application S.N. 751,476, filed Decen~ber 16, 1976, and entitled Air Pressure Switch Signaling Two Different Pressure conditions, the disclo~ure of which is included by reference.
In the illustrated embodiment, both the controls and the pump motor are operated from a 12 volt battery 131. One ; wire 132 from the battery connects to a pair of fuses 133 and 134. I~he other wire 135 from the battery connects to a signal light 136, a horn 137, the solenoid 138 of latch 110, a relay ~ coil 139 and one of wires 39 going to the pump motor. A wire "~ 142 connects fuse 133 to switches 128 and 12g. A wire 143 connects switch 128 to light 136, horn switch 144 and solenoid 138 of latch 110. A wire 145 connects horn switch 144 and the horn. A wire 146 connects switch 129 and relay coil 139. A
wire 147 connects fuse 134 and relay switch 148. The other of motor wires 39 i9 connected to the relay switch 148.
` As previously mentioned~ switches 128 and 129 are 218-13.01 ECV:ls 1~3S~
closed sequentially when the water in the sump rises to, or above, the level 123 at which pumping should commence. The closing of switch 128 completes the circuit to signal light 136, horn 137 and latch 110. The energizing of the latch solenoid retracts the tongue 113 of the latch permitting the carriage 103 and the pump suspended thereby to descend to the dot-dash line position illustrated in Figure 6. The subsequent closing of switch 129 energizes relay coil 139. This closes relay switch 148 and energizes the pump motor through wires 39.
Since the motor is not energized until after the pump is dropped into the water the possibility of the pump becoming air locked is avoided. In some embodiments relay 139, 148 may have another, normally-closed switch which is in series with solenoid 138 of the latch. That normally-closed switch will open when the relay is energized to shut off the power to the latch and thus reduce the drain on the battery.
The signals given by light 136 and horn 137 will alert the occupants to the problem so that they can observe the oper-ation of the pump and make sure that everything will go well.
The continued operation of the horn 137 may be distracting and the occupant can open switch 144 to silence the horn. when the emergency is over and the water level has dropped below the level indicated by line 123, switches 128 and 129 again open. This shuts off the pump motor and the various signaling devices. The occupant then manually raises carriage 103 to the full line position of Figure 6. When this is done, the finger 115 again ~ hooks over the tongue 113 of the latch to suspend the carriage `~ and pump in the elevated position.
Figures 9 and 10 illustrate alternative constructions for the pump shell, the upper reducer, the lower reducer, etc., plus improvements in the intake conduit with respect to the .
218-13. 01 ECV:ls
BACKGROUND AND S UMMARY OF THE INVENT ION
While the present invention is primarily concerned with emergency sump pumps, features thereof can be utilized in pumps for other purpose~.
Two important requirements of emergency sump pumps are that they be reliable, that is, they perform when required, and that they have high performance. For example, when storm water is accumulating in a sump, it is very important that that water be removed to prevent the damage that would otherwise be caused by the water overflowing the sump. Since such emergency pumps are operated only infrequently the existence of a con-dition which would cause pump failure may not be detected until the emergency occurs. Thus the feature of reliability is most significant. When the emergency occurs, water may be entering the sump quite rapidly, thus the necessity for high performance.
~ nother important attribute for a sump pump is that of adaptability to a wide variety of installation requirements.
The configuration, size, etc., of the sump will be different in almost every instance. In fact, in some in~ftances the base-ment floor drain may be the structure that might be referredto a~ the sump. Also, the pump capacity, the type of electric power to be employed, etc., will vary from job to jbb. To meet the varied requirements with a minimum of inventory, it is im-por~ant to the pump supplier to have pump components which can ;~ be varied to meet the requirements of a particular job. Thus, ox example, on one job the puxchaser may want to use a 12 volt . . .
; motor powered by a standby battery while on the next job a per~on may want to utilize 110 volt house current. If the supplier can merely interchange basic electric motors, and render them wat~rproof and utilizable with the other pump ;. -2--.
2 18-13 .01 ECV~ ls 39~0 components, it is not necessary that the supplier stock every type of pump that might be required. This is only illustrative and the same applies to other components necessary to satisfy various installation requirements.
As is almost always the case, the element of cost -also is an important factor to be considered. The business is a competitive business and where the manufacturing cost of the emergency sump pump is high, it may be that the product cannot be sold in competition with units of other designs. For example, 10many sump pumps utilize special castings for the pump, etc.
Thus, the object of the present invention is to pro-duce a versatile, relatively low cost emergency sump pump which will have a high degree of reliability. Various features of the present invention contribute toward this end. For example, standard electric motors of diverse electrical characteristics (voltage, power, etc.) are converted into waterproof motors by substantially only the addition of a pair of end caps. These end caps also provide the necessary standard mountings for mating with the other pump components. This waterproof motor i9 then mounted inside a length of pipe of a standard size Reducers .
on each end of that }ength of pipe provide for the adaptability of the pump to mate with other standard ~izes of pipe utilized for the intake and discharge connections. At the intake end provlsion is made for the mounting of a screen when desired, which screen is formed from a standard length of pipe and also may serve as the pump support.
An important f~ature of the invention is that the water ~eing pumped flows about the motor shell. Thu9 when in use, the motor is constantly being cooled by that water. This increases the efficiency and permits the motor to be worked at a capacity that otherwise might cause excessive heating. The .:
_3_ .
218-13.01 ECV:ls 11~`35~9V
spacers used to position the pipe through which the water is flowing serve as cooling fins. This arrangement) in conjunction with the type of impeller employed, also prevents the downflow of water which occurs9 in the absence of a check valve, when the motor is turned off from causing an undesired, and undesirable, rotation of the motor. Pumping efficiency also is assisted in one embodiment by providing a readily accessible adjustment by which the spacing between the inner end of the intake tube and the impeller may be established after assembly.
Embodimen~s of the invention are relatively small and lightweight considering their pumping capacity. Their structure is such that maintenance is easily performed, both in the shop and in the field.
In one embodiment the pump is mounted externally of the sump and provision is made for automatically dropping the pump into the sump when the necessity for water removal occurs.
other features of the invention will be mentioned and will be apparent from the following description of specific embodiments.
DESCRIPTION OF THE DRAWINGS
Figure 1 is an elevational view of an embodiment of the invention positioned in a sump;
Figure 2 is an exploded view of the pump embodiment of Figure l;
Figure 3 is a longitudinal section through the em-bodiment of Figure l;
Figure 4 is an elevational view of the pump of Figure 1 installed in a floor drain or the like;
Figure 5 is a view as seen at line 5-5 of Figure 3;
Figure 6 is an elevational view of an embodiment . -4-- . - . . , ~ ~
218--13.01 ECV:ls 11~3990 wherein the pump is held outside of the sump until it is neces-sary that the water removal occur;
Figure 7 is a view as seen at line 7-7 of Figure 6;
Figure 8 is a schematic of the electrical control apparatus for the embodiment of Figure 6;
Figure 9 is an elevational view, with portions broken away, of another embodiment; and Figure 10 is a longitudinal section of the lower por-tion of the embodiment of Figure 9 illustrating an additional standpipe conne~tion added thereto.
DESCRIPTION OF SPECIFIC EMBODIMENTS -The following disclosure is offered for public dis-semination in return for the grant of a patent. Although it is detailed to ensure adequacy and aid understanding, this is -not intended to prejudice that purpose of a patent which is to cover each new inventive concept therein no matter how others may later disguise it by variations in form or additions or further improvem~nts.
The pump motor, generally 10, comprises an electric 2Q motor of standard manufacture to which two caps and seals have been added to produce a waterproof motor. The term "waterproof"
is used herein to signify that under normal operating conditions water will not enter the motor. Such a standard electric motor comprises an armature 11 mounted on a shaft 12. For use in ,~connection with the present invention, it is desirable that the shaft be stainless steel. It has a frame formed by a cylindri-cal shell 13~ two end plates 14, and threaded rods 15, with nuts at the upper ends which hold the end plates seated against the ends of the shell. The end plates form mountings for the shaft bearings 16. Mounted in the frame is the field coil 17 and, ,, .
..
218-13.01 ECV-ls 11~39~
where appropriate, the mountings for the brushes (not shown~
supplying the electrical connection to the armature. The motor shown is purely for the purposes of illustration and in actual practice it may be one of a variety of known types of electric motors of diverse electric power supply requirements and output capacities.
To such a motor I have added two end caps 20 and 21.
These caps are bronze castings and have skirts 22 and 23; res-pectively, which extend about shell 13 in juxtaposition there-to. o-rings 24 provide a fluid seal between the end caps and the motor shell 13 thereby forming a fluid-tight motor housing.
The lower end cap has an integral nose 26 with an opening 27 through which the shaft 12 extends. At the distal end of the nose are an o-ring 28 and shaft seals 29 and 30 to prevent fluid from entering about the shaft. The o-ring blocks water from flow-ing between the outside of the shaft seals and the cap 21. It ; often is preferable to put the o-ring between the two seals to hold it securely in place.
Cap 20 has a threaded bore 31 in axial alignment with each of rods 15. At the base of each bore is a wall 32 through which the rod extends. The rods are screwed into threaded blind holes 33 in cap 21. Pipe caps 34 are 8 crewed into the threaded bores 31 to prevent fluid from entering into the motor about the rod~ 15.
Coaxial with the motor shaft there is a threaded bore 36 in cap 20. An electrical fitting 37 is mounted in this bore.
It has a compression cap 38 about a rubber insert (not shown) through which the motor wires 39 extend. Whan the cap is tightened onto the fitting, it compresses the rubber insert about the wires to prevent any entry of fluid thereabout into the motor. The upper end of motor shaft 12 has a screwdriver slot 35 permitting the shaft to be rotated by a screwdriver B
218-13.01 ECV-ls 11~399~) inserted through bore 36 after fitting 37 (or the rubber insert thereof) has been removed.
A plurality of bosses 41 ana 42 project radially outward frc~ caps 20 and 21, respectively, to contact the interior of a pipe 43 which defines the motor and pump chamber 44 between the two reducers S0 and 51 to accommodate the motor 10 and the pump impeller 73. These bosses serve as spacers to position the motor from the inside of the pipe walls so that there is a water passage-way around substantially the circumference of the motor, in that part of the motor and pump chamber 44 between the motor and the -pipe. While there are four such bosses on each cap in the illustra-ted embodiment, the number and positioning will depend upon the de-sires of the manufacturer. At least some (the number depending up-on the preferences of the manufacturer) of the bosses have blind, ; tapped openings 45 extending radially inward from the distal end of the boss. Screws 46 are inserted through openings 47 in pipe 43 and screwed into openings 45 to af~ix th~ motor in the pipe.
; Some manufacturer~ may desire to originally form bosses 41, 42 with a relatively long radial dimension. The bosses of some caps are thereafter cut off to a length to conform to the internal radius of one size of pipe and others to conform to the internal radius of another pipe 8 ize.
one feature of the embod$ment of Figures 1-4 is that many of the components of the complete pump are formed of stand- `-ard sizes of plastic pipe. Thus, for example, the main pipe 43 is a length of "four inch" plastic pipe forming a pump shell.
That is, it has a four inch internal diameter and a four and one-quarter inch e.:ternal diameter. In such instance the distance from the axis of the motor, as represented by shaft 12, to the distal ends of the bosses 41 and 42 i5 two inches. The pipe used is polyvinyl chloride. The smoothness of the pipe and the finished pump makes it easy to clean and there is little problem .
218-13.01 ECV:ls ~i~39~0 with a buildup of debris thereon.
At each end of the main pipe 43 are reducers 50 and 51. In the illustrated embodiment, these are identical, but this need not necessarily be the case. Reducer 50 comprises a large cylindrical sleeve 52, a truncated conical section 53 and a small cylindrical sleeve 54, all as a unitary section.
Large sleeve 52 telescopes into the end of main pipe 43, and thus has an external diameter corresponding to the internal diameter of the pipe (four inches in the example given). The internal diameter of the small ~leeve 54 is such as to tele-scopically receive a piece 56 of pipe of another standard size, smaller than that from which pipe 43 was formed. In the example given, pipe 56 is a piece of ione and three-quarter inch" plastic pipe; i.e., having an internal diameter of one and three-quarter inches and an external diameter of one and seven-eighths inches. Thus the internal diameter of sleeve 54 is one and seven-eighths inches.
Reducer 50 is suitably secured to pipe 43. In the illustrated embodiment this is done by use of an adhesive, but other faqtening means might be employed. Pipe 56 i~ Q imilarly affixed to reducer 50. Pipe 56 forms a part of the discharge passageway for the liquid being pumped. It i9 connected to another pipe 57 (metal or pla~tic) o~ a similar Qize and lead-~; ing to a suitable di~charge point. This connection is formed by a piece of rubber hose 58 which is secured to pipes 56 and 57 by means of hose clamps 59. In the conventional manner the hose clamps have means, not shown, for tightening the clamps about the hose.
The distal snd of pipe 56 has a slot 61 formed in one side thereof, in the illustrated embodiment this slot beingformed by beveling th- end of the pipe. Adjacent this slot are .
218-13 .l ~-~v ls ~i~39~9() two holes 62 in hose 58. The wires 39 from the motor extend through this slot and through the holes 62, the fit of the hose about the wires being sufficiently tight to prevent water leak-age at that point. Because of the slot 61 it is not possible for the installer to pinch wires 39 when connecting pipe 57 to the pump. Pipe 57 will abut the apex of the tapered end of pipe 56 and thus prevent the wires from being pinched.
Similarly, reducer 51 i5 a unitary element made up of a large cylindrical sleeve 64, small cylindrical sleeve 65 and a truncated conical section 66 therebetween. The external diameter of the large cylindrical sleeve 64 is such as to tele-scope within main pipe 43. The internal diameter of the small cylindrical sleeve 65 is such as to telescopically receive a piece of pipe 67 of another of the standard sizes; in the ex-ample given, it being a one and three-quarter inch pipe. The large cylindrical sleeve is removably affixed to the main pipe 43. In the illustrated embodiment this i~ done by means of screws 68 which extend through openings 69 in main pipe 43 and , are threaded into opening~ 70 in the reducer 51. An O-ring 71 forming a seal is seated in a groove in sleeve 64 at the end of main pipe 43.
Pipe 67 serves as the intake conduit ~or the pump.
It extends to within a ~hort distance of the pump impeller 73 and is coaxial therewith. It frictionally engages sleeve 65 , and thus can be adjusted with respect to the impeller. A
plastic pipe coupling 74 is slipped onto the external end of . ~, he pipe 67. In some embodiment~ the small cylindrical sleeve ; ~ 65 would be extended axialIy for a sufficient di~tance to serve the function of the separate coupling 74, which would then be eliminated. A draw pipe 75 of the desired length, etc., is fitted into coupling 74 in the field. The slanting of the bottom . ~
_g_ 218-13.01 ECV:ls 39~
of the draw pipe ameliorates the problem of accidental blockage of the intake opening. Were it desired to pump down to a Low level in the pit the bottom of the draw pipe would be normal to the axis of the pipe (as is draw pipe 75').
Impeller 73 comprises a flat plate 77 which effec-tively covers the end of opening 27 in the motor and prevents water from being forced directly at the seals 28-30. Extend-ing downwardly from plate 77 are a plurality of vanes 78. Motor shaft 12 extends into a hub 79 of the impeller. A stainless steel screw 80 extends through the hub and is threaded into the motor shaft to hold the impeller onto the shaft. Since the down flow of water which occurs when the motor is deenergized does not tend to rotate the impeller there is no danger of the screw unscrewing by reason of such a reverse rotation.
For some installation~ it is de~irable to have a screen about the pump draw pipe to prevent floating debris from entering the draw pipe. Such a screen i5 formed by a second length 81 of a pipe of the same size as that of main pipe 43; in the example given, it being four inch pipe. This second length of pipe has a plurality of openings 82 in the lower part thereof. These openings are sufficiently small to prevent the normal debriq from entering the screen pipe 81. A
suitable size is ~even-sixteenths inch in diameter. The screen pipe 81 slips onto the exposed portion of sleeve 64 of the `~ bottom reducer and is held in place by friction. The holes are .i ; adjacent one end of the screen pipe. Thus by reversing the screen pipe end-for-end, the ~creen may be positioned high or low in the sump to accommodate different installation require-ments.
; 30 By way of illustrating the various ways in which embodiments of the invention may be employed, reference may .
~18-13. 01 ECV: ls 3C~
be first made to Figure 1 which shows a sump 85 in which water 86 may accumulate from time to time. This sump is, for example, a pit in a basement floor 87 and has a bottom 88. If it is de~ired to have the pump be self-~upporting on the bottom of the sump, a plurality (e.g., three) of ru~ber feet 90 may be affixed to the bottom of the screen pipe 81. These feet are items such as crutch tips or chair leg tipq in which there is a slot 9l. The slot is of such a width that the upper part of the feet will slip over the screen pipe 81 and be frictionally secured thereto. Thus the pump is supported on the pit bottom 88 with the screen pipe 81 spaced a short distance from the bottom of the Qump. The discharge pipe 57 connected to the top of the pump will ensure that the pump does not upset within the sump.
Alternatively, the pump may extend through a floor plate 93 covering the top of the sump. A ring 94 secured to the main pipe 43 and resting upon the floor plate 93 may be used to su~pend the pump within the aump. In that event, it is ;~ not necessary for the bottom of the pump (or the feet 90) to ~20 bear against the bottom of the sump. The ring 94 may be of elastomeric material, frictionally engaging the main pipe 43.
The connection to pipe 57 will also bear ~ome of the weight of ; the pump in addition to the ~upport provided by ring 94.
Figure 4 illustrates the manner in which the pump may ~ be employed much in the form of a standpipe to prevent a back ,~ flow in a floor drain 96 or the like in a basement floor 87. In this instance a d~raw pipe 75' having a straight bottom is in-serted into coupling 74. It projects through an opening in an elastomeric gasket 97 which is placed in the cavity intended to . .
~11-:
:
2 18-13 . ol ECV: ls 1~(~3gg~
hold the floor plate of the floor drain, If water begins to back up into the floor drain 96 the pump may be turned on ~manually or automatically) to remove that water to another location for discharge.
Figures 6 and 7 illustrate the manner in which the pump is employed, when it i9 desired that the pump normally be out of the water except when it is in use, thereby preventing any deleterious action to the pump as a result of its standing in the water. A vertical track lO0 defining a vertical way i8 mounted adjacent the sump 85. In the illustrated embodiment this track is formed by a pipe secured to a floor plate lOl.
The floor plate is suitably attached to the floor 87 as by means of bolts 102. A carriage 103 is vertically movable along the track 100. This carriage comprises a ring 104 which en-circles pipe 100, an arm 105 extending out from the ring and a 8 addle I06 on the end of the arm. Screws 107 extend through openings in the saddle and are threaded into the main pipe 43 to support the pump in the saddle. The ring 104 is free to slide up and down the pipe 100. In some embodiments vertical ; 20 guides may be employed to prevent the rotation of the ring about the pipe, and ball bearings or other antifriction means may be employed to ensure that the carriage move~ easily along its track.
An electric latch llO i9 secured to a mounting ring lll. Ring lll has thumbscrew~ 112 to engage track lO0 to fix the ring's position on the track. The electric latch 110 is imilar to the electric latches commonly uQed to prevent a door from opening except when the latch is energi~ed. It includes a tongue 113 which i~ outwardly spring bia~ed and iq retracted inwardly when a solenoid in the latch is energized. A support 114 is secured to arm 105 of the carriage and has a finger 115 ,~ :
. : . . : ,. . .
218-13.OL
~CV: 1~
~i~399(~
which hooks over tongue 113 to normally support the carriage, and thus the pump3 in the full line position illustrated in Figure 6. When the solenoid of latch 110 i5 energized, thereby retracting tongue 113 from below the finger 115, the carriage 103 is released to descend along track 100. A rubbex bumper 116 is placed about track 100 at the bottom thereof to cushion the descent of the carriage. Counterweights may be employed if desired to slow the descent of the carriage and pump along the track. A flexible hose 117 serves as the discharge conduit for the pump and i5 sufficiently long to permit movement of the pump between the raised and lowered positions. It is affixed by being clamped within hose 58 (or it may be clamped directly to pipe 56 in place of hose 58). Wires 39 to the motor also are sufficiently long to permit the vertical movement of the pump.
The controls for the pump are in a control box 119 at a suitable location, aq for example atop the pipe track 100.
These controls include a sensor for determining when the water 86 rises to a level within the sump such that the pumping should commence. A part of this sensor is positioned in the sump. In the illustrated embodiment, the sensor i8 pneumatically operated and the part thereof within the QUmp COmpriQes a bsll 120 having an open bottom. The interior of the bell communicateQ with a tube 121. This tube is used to suspend the bell within the sump. Thus, a portion of the mounting plate 101 extends over the sump and the tube 121 passes through that portion.
A clamp 122 is placed about the tube at a location at which the bell 120 will be suspended at a height such that a `i sensor will signal the controls when the water has risen to a level such that pumping should commence. Thus assume that the line 123 repre~ents the elevation selected for the commencement `
.
218-13 .01 ECV:ls ~i~3~90 of the pumping operation. The bell 120 is suspended so that its bottom open end is below the level 123. As the water rises ahove the bottom end of the bell, air is trapped in the bell and as the watex level continues to rise, the air pressure in the bell correspondingly increa~e~. This air pressure i~ trans-mitted through tube 121 to a pneumatic pressure detector.
The control apparatus is schematically illustrated in Figure 8. The pneumatic detector compriseC a housing 125 across which is a diaphragm 126, the two defining a pre~sure chamber 127. Tube 121 communicates with this chamber. As the pressure in the bell 120 increases the diaphragm 126 is moved outwardly, first closing switch 128 and with a further increase in water level then closing switch 129. Such an air pressure detector apparatus which will actuate different switches at different pressures is disclosed in my pending U. S. patent application S.N. 751,476, filed Decen~ber 16, 1976, and entitled Air Pressure Switch Signaling Two Different Pressure conditions, the disclo~ure of which is included by reference.
In the illustrated embodiment, both the controls and the pump motor are operated from a 12 volt battery 131. One ; wire 132 from the battery connects to a pair of fuses 133 and 134. I~he other wire 135 from the battery connects to a signal light 136, a horn 137, the solenoid 138 of latch 110, a relay ~ coil 139 and one of wires 39 going to the pump motor. A wire "~ 142 connects fuse 133 to switches 128 and 12g. A wire 143 connects switch 128 to light 136, horn switch 144 and solenoid 138 of latch 110. A wire 145 connects horn switch 144 and the horn. A wire 146 connects switch 129 and relay coil 139. A
wire 147 connects fuse 134 and relay switch 148. The other of motor wires 39 i9 connected to the relay switch 148.
` As previously mentioned~ switches 128 and 129 are 218-13.01 ECV:ls 1~3S~
closed sequentially when the water in the sump rises to, or above, the level 123 at which pumping should commence. The closing of switch 128 completes the circuit to signal light 136, horn 137 and latch 110. The energizing of the latch solenoid retracts the tongue 113 of the latch permitting the carriage 103 and the pump suspended thereby to descend to the dot-dash line position illustrated in Figure 6. The subsequent closing of switch 129 energizes relay coil 139. This closes relay switch 148 and energizes the pump motor through wires 39.
Since the motor is not energized until after the pump is dropped into the water the possibility of the pump becoming air locked is avoided. In some embodiments relay 139, 148 may have another, normally-closed switch which is in series with solenoid 138 of the latch. That normally-closed switch will open when the relay is energized to shut off the power to the latch and thus reduce the drain on the battery.
The signals given by light 136 and horn 137 will alert the occupants to the problem so that they can observe the oper-ation of the pump and make sure that everything will go well.
The continued operation of the horn 137 may be distracting and the occupant can open switch 144 to silence the horn. when the emergency is over and the water level has dropped below the level indicated by line 123, switches 128 and 129 again open. This shuts off the pump motor and the various signaling devices. The occupant then manually raises carriage 103 to the full line position of Figure 6. When this is done, the finger 115 again ~ hooks over the tongue 113 of the latch to suspend the carriage `~ and pump in the elevated position.
Figures 9 and 10 illustrate alternative constructions for the pump shell, the upper reducer, the lower reducer, etc., plus improvements in the intake conduit with respect to the .
218-13. 01 ECV:ls
3~
impeller. It should be recognized that substantially any one of these can be employed with the remaining structure of the Figure 1-3 embodiment without necessarily using them all, and vice versa.
In the en~odiment of Figures 9 and 10, the motor 10 and the impeller 73 employed therein are identical to those previously described. However, the shell 151 is a length of four inch I.D. copper pipe. One end of this length of pipe has been spun down to form reducer 152 with an upper neck 153. This neck substantially corresponds to a standard pipe size and is intended to receive a flexible hose 154. So that the hose will be securely attached to the neck, the neck is spun with a groove or depression 156. Thus as a hose clamp 157 is tightened about the hose, the hose i9 forced into the groove 156 so that a secure attachment is obtained.
While a length of hose so affixed to the shell can serve alone as the discharge conduit, the illustrated embodi-ment includes an additional connector having pipe threads 158 ~: on the distal end, a neck 159 on the proximal end and an inter-mediate hexagonal portion 160 adapted for engagement by a wrench.
Preferably, the neck 159 also includes a groove 161 so that hose clamp 157 will securely affix the hose 154 to the neck. A sup-port plate 163 has a central opening sufficiently large to per-mit neck 159 to pass therethrough, but ~ufficiently small so `
that the upper side of the support plate will bear against the underside of the hexagonal portion 160 of the connector. At one side~ the support plate has an opening to receive an end : ~ :
fitting 164 of an electrical cable 165. The fitting 164 has a mesh cable gripper 166 which securely holds the cable to the ~30 fltting when tension is put on the cable as by way of support-ing the pump unit thereby. At the opposite side of the support ,~ .
, . . . . . . . . . .
.. . ...
218-13.01 Ecv:ls i~39~
p;Late is an opening 167 which may be used to anchor a support rope or cable so that such strain on the electrical cable will not normally occur.
This embodiment is particularly suited for use in pumping out manholes or the like. For such an application, the end fitting of a discharge hose would ~e screwed onto the threads 158. The unit is then lowered through a manhole open-ing to the bottom of the manhole to pump out the manhole. When used in a permanent installation, a pipe fitting having a dis-charge pipe coupled thereto might be screwed onto threads 158.
In this embodiment, the reducer, generally 170, at the intake end of the shell 151 includes an expansion fitting 171 which frictionally engages the interior of the shell in a watertight manner and forms the large end of the reducer. This fitting comprises an upper disc 172 and a lower disc 173. The peripheral face~ of the discs are somewhat smaller than the internal diameter of the pipe which they are to fit. Each disc has an annular cam face 172a and 173a, respectively, in the form of a frustum of a cone. Between the two discs are two semi-cylindrical pressure plates 174 having axial end faces which are complementary to and abut the cam faces 172a and 173_. The discs and the pressure plates are formed of a relatively rigid plastic.
Externally of the pres~ure plate is an annular, elastomeric seal ~ ring 176. ThiH seal ring normally has an external diameter `~ ~ slightly smaller than the internal diameter of the shell 151, ~` however, when it is expanded as hereinafter described, it securely :
engages the inner wall of the shell. The periphery of the seal ; ring has a plurality of small, annular ribs 177 to improve its engaging and sealing function.
The upper disc 172 has a smooth axial opening 178 while the lower disc hao a threaded axial opening 179. The , 218-13 .01 ECV: ls 11~3990 upper disc has four, internally threaded bosses 181 and the lower disc has four, smooth bosses 182. The four bosses are positioned ninety degrees apart in the azimuth about the axis.
Stud bolts 183 slide through bosses 182 and are screwed into bosses 181.
A tube 185 having external threads 186 extends through the axial openings 178 and 179, which serves as an intake con-duit means and the lower or external part of which serves as what may be referred to as the small end of the reducer. The upper end of the tube has a plate 187 normal to the axis of the tube. This plate is only slightly smaller in external diameter than is the internal diameter of the ~hell 151. The lower end of the tube has a coupling 188 to receive a pipe which is sub-stantially smaller in diameter than is the internal diameter of the shell 151. In the illustrated embodiment, a pipe 189 form-iny the draw pipe is received in coupling 188 and secured there-in by means of an adhesive. In the illustrated embodiment the tube 185 and pipe 189 have an internal diameter of one and three-quarter inches. Both are formed of relatively rigid plastic.
The lower end of the draw pipe is tapered as seen at 190 as an aid toward avoiding blocking of the draw pipe.
The support pipe and screen 192 is formed of a length of metal or plaAtic pipe of the same nominal size as that of shell 151. This length has a small longitudinal segment cut ~ : .
out to define a slot 193. This permits the pipe to be diametric-ally squeezed to a sufficiently small size so that it will 51ip ; within the shell to a position at which it abuts the undexside of lower disc 173. The pipe has sufficient resiliency so as to expand, when the squeezing force is removed, to engage the inner wall of the shell. By reacon of its abutting the disc 173 of the reducer 170, it can be used to support the weight of the .
218-13.01 ECV:ls g~
pump. Support pipe 192 has openings 194 corresponding to open-ings 82 of the previously described embodiment.
After the motor 10 with the impeller 73 mounted thereon has been secured in position in the shell 151, the reducer 170 is put into the shell. Before the reducer is inserted, the bolts 183 are loose and the tube 185 is rotated in a manner such as to cause the threads to draw the tube downwardly so that the plate 187 is relatively close to the upper disc 172. By having bolts 183 loose, the seal ring 176 is not deformed and is smaller than the internal diameter of the shell. The reducer 170 i9 then slipped into the shell and positioned so that the plate 187 is adjacent the impeller 73. Bolts 183 are then tightened. The 1;ightening of these bolts draws the two discs 172 and 173 to-gether. As they are drawn together, the cam faces 172a and 173a force the two pressure plates 174 radially outward. In turn, the pressure plates 174 expand the seal ring 176 and forces it tightly against the inner face of the shell. Thus by tightening the bolts 183 the reducer 170 securely engage~ the shell. In addition to obtaining this secure engagement, the seal ring pro-~ 20 vides a watertight seal between the discs and the shell.
; After expansion fitting has thus been secured in place, the tube 185 is rotated in a direction such that it, and plate L87, are moved axially toward the impeller 73. For best pumping efficiency the plate 187 is positioned as close as possible to the impeller, without actual contact between the two.
In electric motors of the type described, there will ,:
~ be some axial end play in the motor shaft. The am~unt of such r~ ~ play, particularly in moderately priced motors, will not be identical in every motor aven though each motor is presumably the same as the others. Since that end play will affect the axial position of the impeller 73, it will affect the spacing 218-13. 01 ECV: ls ~1~39911) betwe~n the impeller and the inner end of the intake conduit and, with an arrangement such as that of ~igures 1-3, that spacing must be sufficient to accommodate the motor with the greatest end play. Thus with motors having lesser end play the spacing will be greater than the optimum. This problem is avoided by the use of the adjustment just described. The plate 187 at the inner end of the intake conduit improves the pumping efficiency.
Some manufacturers or users will desire to wind several layers of plastic tape (commonly referred to as Polytetrafluoro-ethylene Tape for pipe thread sealing) about tube 185 and in abutment with the bottom of disc 173, a portion o~ those tape windings being seen at 197 to provide a water seal betwe~n the tube 185 and the disc 173.
If it is desired to use the embodiment of Figures g and 10 in a standpipe type installation, such as is illustrated in Figure 4, the support pipe and screen 192 normaLly would not be used, but would be removed. A piece of pipe 200 of the same nominal pipe size as that of draw pipe 189 would be used and provided with a tapered end 201 corresponding to the taper 190.
Pipe 200 would be aligned so that the two tapers 190 and 201 were mated and a hose 202 would be positioned over the two pipes.
Hose clamps 203 would secure the hose to each o~ the two pipes.
of course~ the pipe 200 could be of any desired length.
With hose 202 down over draw pipe 189 to just above screen 192 (but without extension pipe 200) it will act as a draw pipe and there can be manual pump down of flat areas to within one-half inch of a flat surface before the air intake breaks the pumping action. The bottom of the hose in such an arrangement may be at various levels above the bottom of taper 190 which permits an adjustment in the level to which the in-stallation will pump down. After the desired level is selected the hose is clamped into position to retain the setting.
impeller. It should be recognized that substantially any one of these can be employed with the remaining structure of the Figure 1-3 embodiment without necessarily using them all, and vice versa.
In the en~odiment of Figures 9 and 10, the motor 10 and the impeller 73 employed therein are identical to those previously described. However, the shell 151 is a length of four inch I.D. copper pipe. One end of this length of pipe has been spun down to form reducer 152 with an upper neck 153. This neck substantially corresponds to a standard pipe size and is intended to receive a flexible hose 154. So that the hose will be securely attached to the neck, the neck is spun with a groove or depression 156. Thus as a hose clamp 157 is tightened about the hose, the hose i9 forced into the groove 156 so that a secure attachment is obtained.
While a length of hose so affixed to the shell can serve alone as the discharge conduit, the illustrated embodi-ment includes an additional connector having pipe threads 158 ~: on the distal end, a neck 159 on the proximal end and an inter-mediate hexagonal portion 160 adapted for engagement by a wrench.
Preferably, the neck 159 also includes a groove 161 so that hose clamp 157 will securely affix the hose 154 to the neck. A sup-port plate 163 has a central opening sufficiently large to per-mit neck 159 to pass therethrough, but ~ufficiently small so `
that the upper side of the support plate will bear against the underside of the hexagonal portion 160 of the connector. At one side~ the support plate has an opening to receive an end : ~ :
fitting 164 of an electrical cable 165. The fitting 164 has a mesh cable gripper 166 which securely holds the cable to the ~30 fltting when tension is put on the cable as by way of support-ing the pump unit thereby. At the opposite side of the support ,~ .
, . . . . . . . . . .
.. . ...
218-13.01 Ecv:ls i~39~
p;Late is an opening 167 which may be used to anchor a support rope or cable so that such strain on the electrical cable will not normally occur.
This embodiment is particularly suited for use in pumping out manholes or the like. For such an application, the end fitting of a discharge hose would ~e screwed onto the threads 158. The unit is then lowered through a manhole open-ing to the bottom of the manhole to pump out the manhole. When used in a permanent installation, a pipe fitting having a dis-charge pipe coupled thereto might be screwed onto threads 158.
In this embodiment, the reducer, generally 170, at the intake end of the shell 151 includes an expansion fitting 171 which frictionally engages the interior of the shell in a watertight manner and forms the large end of the reducer. This fitting comprises an upper disc 172 and a lower disc 173. The peripheral face~ of the discs are somewhat smaller than the internal diameter of the pipe which they are to fit. Each disc has an annular cam face 172a and 173a, respectively, in the form of a frustum of a cone. Between the two discs are two semi-cylindrical pressure plates 174 having axial end faces which are complementary to and abut the cam faces 172a and 173_. The discs and the pressure plates are formed of a relatively rigid plastic.
Externally of the pres~ure plate is an annular, elastomeric seal ~ ring 176. ThiH seal ring normally has an external diameter `~ ~ slightly smaller than the internal diameter of the shell 151, ~` however, when it is expanded as hereinafter described, it securely :
engages the inner wall of the shell. The periphery of the seal ; ring has a plurality of small, annular ribs 177 to improve its engaging and sealing function.
The upper disc 172 has a smooth axial opening 178 while the lower disc hao a threaded axial opening 179. The , 218-13 .01 ECV: ls 11~3990 upper disc has four, internally threaded bosses 181 and the lower disc has four, smooth bosses 182. The four bosses are positioned ninety degrees apart in the azimuth about the axis.
Stud bolts 183 slide through bosses 182 and are screwed into bosses 181.
A tube 185 having external threads 186 extends through the axial openings 178 and 179, which serves as an intake con-duit means and the lower or external part of which serves as what may be referred to as the small end of the reducer. The upper end of the tube has a plate 187 normal to the axis of the tube. This plate is only slightly smaller in external diameter than is the internal diameter of the ~hell 151. The lower end of the tube has a coupling 188 to receive a pipe which is sub-stantially smaller in diameter than is the internal diameter of the shell 151. In the illustrated embodiment, a pipe 189 form-iny the draw pipe is received in coupling 188 and secured there-in by means of an adhesive. In the illustrated embodiment the tube 185 and pipe 189 have an internal diameter of one and three-quarter inches. Both are formed of relatively rigid plastic.
The lower end of the draw pipe is tapered as seen at 190 as an aid toward avoiding blocking of the draw pipe.
The support pipe and screen 192 is formed of a length of metal or plaAtic pipe of the same nominal size as that of shell 151. This length has a small longitudinal segment cut ~ : .
out to define a slot 193. This permits the pipe to be diametric-ally squeezed to a sufficiently small size so that it will 51ip ; within the shell to a position at which it abuts the undexside of lower disc 173. The pipe has sufficient resiliency so as to expand, when the squeezing force is removed, to engage the inner wall of the shell. By reacon of its abutting the disc 173 of the reducer 170, it can be used to support the weight of the .
218-13.01 ECV:ls g~
pump. Support pipe 192 has openings 194 corresponding to open-ings 82 of the previously described embodiment.
After the motor 10 with the impeller 73 mounted thereon has been secured in position in the shell 151, the reducer 170 is put into the shell. Before the reducer is inserted, the bolts 183 are loose and the tube 185 is rotated in a manner such as to cause the threads to draw the tube downwardly so that the plate 187 is relatively close to the upper disc 172. By having bolts 183 loose, the seal ring 176 is not deformed and is smaller than the internal diameter of the shell. The reducer 170 i9 then slipped into the shell and positioned so that the plate 187 is adjacent the impeller 73. Bolts 183 are then tightened. The 1;ightening of these bolts draws the two discs 172 and 173 to-gether. As they are drawn together, the cam faces 172a and 173a force the two pressure plates 174 radially outward. In turn, the pressure plates 174 expand the seal ring 176 and forces it tightly against the inner face of the shell. Thus by tightening the bolts 183 the reducer 170 securely engage~ the shell. In addition to obtaining this secure engagement, the seal ring pro-~ 20 vides a watertight seal between the discs and the shell.
; After expansion fitting has thus been secured in place, the tube 185 is rotated in a direction such that it, and plate L87, are moved axially toward the impeller 73. For best pumping efficiency the plate 187 is positioned as close as possible to the impeller, without actual contact between the two.
In electric motors of the type described, there will ,:
~ be some axial end play in the motor shaft. The am~unt of such r~ ~ play, particularly in moderately priced motors, will not be identical in every motor aven though each motor is presumably the same as the others. Since that end play will affect the axial position of the impeller 73, it will affect the spacing 218-13. 01 ECV: ls ~1~39911) betwe~n the impeller and the inner end of the intake conduit and, with an arrangement such as that of ~igures 1-3, that spacing must be sufficient to accommodate the motor with the greatest end play. Thus with motors having lesser end play the spacing will be greater than the optimum. This problem is avoided by the use of the adjustment just described. The plate 187 at the inner end of the intake conduit improves the pumping efficiency.
Some manufacturers or users will desire to wind several layers of plastic tape (commonly referred to as Polytetrafluoro-ethylene Tape for pipe thread sealing) about tube 185 and in abutment with the bottom of disc 173, a portion o~ those tape windings being seen at 197 to provide a water seal betwe~n the tube 185 and the disc 173.
If it is desired to use the embodiment of Figures g and 10 in a standpipe type installation, such as is illustrated in Figure 4, the support pipe and screen 192 normaLly would not be used, but would be removed. A piece of pipe 200 of the same nominal pipe size as that of draw pipe 189 would be used and provided with a tapered end 201 corresponding to the taper 190.
Pipe 200 would be aligned so that the two tapers 190 and 201 were mated and a hose 202 would be positioned over the two pipes.
Hose clamps 203 would secure the hose to each o~ the two pipes.
of course~ the pipe 200 could be of any desired length.
With hose 202 down over draw pipe 189 to just above screen 192 (but without extension pipe 200) it will act as a draw pipe and there can be manual pump down of flat areas to within one-half inch of a flat surface before the air intake breaks the pumping action. The bottom of the hose in such an arrangement may be at various levels above the bottom of taper 190 which permits an adjustment in the level to which the in-stallation will pump down. After the desired level is selected the hose is clamped into position to retain the setting.
Claims (22)
1. A pump for use as a sump pump or the like in pumping a liquid and utilizing pipe, said pump comprising:
an electric motor including a waterproof housing of a given diameter, and a motor shaft defining an axis and with a portion of the shaft externally of said housing, said motor in-cluding an armature within said housing and a frame comprising a cylindrical shell about said armature, means at each end of the shell for rotatably supporting the armature, and bolts extending within the shell and through the frame and holding said supporting means unitary with the shell, said motor being characterized by:
caps positioned at each end of said frame respectively, each cap having a skirt extending from the respective end toward the opposite end and outside and in immediate juxtaposition to said shell, said bolts extending from cap to cap and holding the caps in assembled condition on said frame as well as holding said supporting means unitary with said shell, one of said caps having an opening through which said shaft ex-tends; and sealing means including o-rings between said skirts and said shell and a shaft seal between the shaft and said one cap;
whereby said shell and said caps form said waterproof housing;
a pump impeller affixed to said portion of said shaft;
a length of a first size of said pipe having an inter-nal diameter significantly greater in internal diameter than is said given diameter, said length surrounding said motor and having a first end adjacent the said impeller and a second end adjacent the other end of the motor;
means affixing the motor to the length of pipe and spac-ing said housing at all sides thereof from said pipe whereby there is space substantially all about said motor for the flow of liquid in a generally axial direction;
a reducer having a large end and a small end, said large end telescopically mating with and engaging said first end of said length of pipe, said small end being of a size substantially small-er than said given diameter and including conduit means extending to a location adjacent said impeller and forming the intake of said pump;
conduit means connected to said second end of said length of pipe and forming the discharge for said pump;
whereby the liquid pumped flows about said motor to cool the motor.
an electric motor including a waterproof housing of a given diameter, and a motor shaft defining an axis and with a portion of the shaft externally of said housing, said motor in-cluding an armature within said housing and a frame comprising a cylindrical shell about said armature, means at each end of the shell for rotatably supporting the armature, and bolts extending within the shell and through the frame and holding said supporting means unitary with the shell, said motor being characterized by:
caps positioned at each end of said frame respectively, each cap having a skirt extending from the respective end toward the opposite end and outside and in immediate juxtaposition to said shell, said bolts extending from cap to cap and holding the caps in assembled condition on said frame as well as holding said supporting means unitary with said shell, one of said caps having an opening through which said shaft ex-tends; and sealing means including o-rings between said skirts and said shell and a shaft seal between the shaft and said one cap;
whereby said shell and said caps form said waterproof housing;
a pump impeller affixed to said portion of said shaft;
a length of a first size of said pipe having an inter-nal diameter significantly greater in internal diameter than is said given diameter, said length surrounding said motor and having a first end adjacent the said impeller and a second end adjacent the other end of the motor;
means affixing the motor to the length of pipe and spac-ing said housing at all sides thereof from said pipe whereby there is space substantially all about said motor for the flow of liquid in a generally axial direction;
a reducer having a large end and a small end, said large end telescopically mating with and engaging said first end of said length of pipe, said small end being of a size substantially small-er than said given diameter and including conduit means extending to a location adjacent said impeller and forming the intake of said pump;
conduit means connected to said second end of said length of pipe and forming the discharge for said pump;
whereby the liquid pumped flows about said motor to cool the motor.
2. A pump as set forth in claim 1 and characterized by utilizing pipe of standard sizes of internal and external diameter about an axis, said first size of pipe being one of said standard sizes.
3. A pump as set forth in claim 2, wherein said large end of said reducer is in the form of a cylindrical sleeve of an external diameter substantially corresponding to said given diame-ter and extending within said first end, and said small end of said reducer is in the form of a cylindrical sleeve having an internal diameter substantially corresponding to the external diameter of another of said standard sizes, said other standard size being sub-stantially smaller than said first size, whereby the last mentioned sleeve can be used as a coupling for said other size.
4. A pump as set forth in claim 3 wherein said first mentioned cylindrical sleeve extends only partially into said first end and has a portion externally of said first end; and 218-13.01 including another length of said pipe of said first size, said other length being telescopically mounted on said external portion, said other length having openings therethrough whereby said liquid may flow through said openings into the interior of the other length and the other length acts as a pump screen; and including a piece of pipe of said other of said standard sizes telescopically mounted in said smaller of said sleeves and projecting outwardly therefrom and into said other pipe of said first size to serve as an intake conduit for said pump.
5. A pump as set forth in claim 4, wherein said piece of pipe of said other of said sizes extends into said reducer beyond the smaller of said sleeves and serves as said conduit means forming the intake for said pump; and including a coupling member mounted on the outwardly projecting part of said piece of pipe; and including another piece of pipe of said other of said standard sizes and having two ends, one of the latter ends being telescopically mounted in the coupling member and the other there-of being beveled across that end.
6. A pump as set forth in claim 4, wherein said conduit means connected to said second end includes:
a reducer at said second end and having a large end and a small end, said large end of said second end reducer is in the form of a cylindrical sleeve of an external diameter substantially corresponding to said given diameter and extending within said second end, and said small end of said second end reducer is in the form of a cylindrical sleeve having an internal diameter substan-tially corresponding to the external diameter of one of said stand-ard sizes, said one standard size being substantially smaller than said first size, whereby the last mentioned sleeve can be used as a coupling for said one size.
a reducer at said second end and having a large end and a small end, said large end of said second end reducer is in the form of a cylindrical sleeve of an external diameter substantially corresponding to said given diameter and extending within said second end, and said small end of said second end reducer is in the form of a cylindrical sleeve having an internal diameter substan-tially corresponding to the external diameter of one of said stand-ard sizes, said one standard size being substantially smaller than said first size, whereby the last mentioned sleeve can be used as a coupling for said one size.
7. A pump as set forth in any of claims 1, 3 or 4, wherein said pipe is plastic.
8. A pump as set forth in claim 2, wherein said conduit means connected to said second end includes:
a reducer at said second end and having a large end and a small end, said large end of said second end reducer being of a size substantially corresponding to that of said first size, and said small end of said second end reducer is in the form of cylin-drical sleeve means of a size substantially corresponding to the size of one of said standard sizes, said one standard size being substantially smaller than said first size.
a reducer at said second end and having a large end and a small end, said large end of said second end reducer being of a size substantially corresponding to that of said first size, and said small end of said second end reducer is in the form of cylin-drical sleeve means of a size substantially corresponding to the size of one of said standard sizes, said one standard size being substantially smaller than said first size.
9. A pump as set forth in claim 8, including a piece of hose slipped onto said sleeve means, and a hose clamped onto said sleeve means and having a portion be-yond the sleeve means; and wherein said motor has wire means extending therefrom for use in supplying electric power to the motor, said wire means extending from said motor through said sleeve means and out through the side of the hose.
10. A pump as set forth in claim 9, including a pipe con-nector having a sleeve integral therewith and of substantially the same size as said sleeve means, said hose having a distal end clamped to said connector sleeve.
11. A pump as set forth in claim 9, wherein said sleeve means has a distal end with slot in a side thereof, said wire means extending from said motor through said slot and through said hose opposite said slot.
12. A pump as set forth in claim 8, wherein said length of pipe of said first size is copper pipe and the upper end thereof is spun down to form said reducer at said second end, said small end of said second end reducer having a groove therein to enable said hose to be more securely clamped thereto.
13. A pump as set forth in claim 1, wherein said reducer 218-13.01 includes a tube mounted in said large end of the reducer for move ment longitudinally along said axis and having portions at the im-peller side of said large end and also at the opposite side there-of, said opposite side portion forming said small end of the re-ducer, said portion of the impeller side including a plate normal to the axis and having a periphery in juxtaposition to the inside of said pipe.
14. A pump as sat forth in claim 13, wherein said large end is an expansible fitting including a peripheral seal ring of elastomeric material and means for expanding said ring into en-gagement with the inside of said pipe.
15. A pump as set forth in claim 13, wherein said large end has an axial, internally threaded portion defining an opening, said tube extending through said opening and having external threads engaging the internal threads of said portion, whereby rotation of the tube with respect to the large end produces said longitudinal movement along said axis.
16. A pump as set forth in claim 1 and for use in con-junction with a sump in which said liquid may accumulate from time to time, said pumpt being characterized by:
fixed means adjacent said sump and forming a substan-tially vertical way;
a carriage mounted on said fixed means for movement along said way and including means connected to said pump for positioning said pump in a vertical position in relation to the vertical position of the carriage;
control means including sensor means having at least part thereof positioned in said sump for detecting when the liquid in the pump has risen at least to a given level, said control means being connected to the pump motor for energizing the pump motor when the liquid rises to said level; and latch means engaging said carriage to normally hold said carriage and pump in an elevated position, and connected to said control means to release said carriage for gravity descent to a lower position at which the pump intake is below said given level when said pump is energized by said control means.
fixed means adjacent said sump and forming a substan-tially vertical way;
a carriage mounted on said fixed means for movement along said way and including means connected to said pump for positioning said pump in a vertical position in relation to the vertical position of the carriage;
control means including sensor means having at least part thereof positioned in said sump for detecting when the liquid in the pump has risen at least to a given level, said control means being connected to the pump motor for energizing the pump motor when the liquid rises to said level; and latch means engaging said carriage to normally hold said carriage and pump in an elevated position, and connected to said control means to release said carriage for gravity descent to a lower position at which the pump intake is below said given level when said pump is energized by said control means.
17. A pump as set forth in claim 16, wherein said conduit means connected to said second end includes:
a reducer secured to said second end, having a distal end, and being substantially smaller than said first size; and a flexible hose secured to said distal end, said hose being of a length sufficient to permit said pump to move between said elevated position and said lower psition.
a reducer secured to said second end, having a distal end, and being substantially smaller than said first size; and a flexible hose secured to said distal end, said hose being of a length sufficient to permit said pump to move between said elevated position and said lower psition.
18. A pump as set forth in any of claims 1, 4 or 8, wherein at least part of said caps being generally cylindrical about an axis with the exterior thereof having a radius substan-tially smaller than half said internal diameter, said caps in-cluding bosses extending radially outwardly at spaced intervals thereabout, the bosses having distal ends at a radial distance from said axis substantially corresponding to half said internal diameter, one of said bosses having a threaded opening extending radially inward from said distal end, said one boss forming part of said means affixing the motor.
19. A pump as set forth in claim 18, wherein said impeller comprises an annular plate having two sides and of a peripheral diameter substantially larger than the diameter of said opening in said one cap, one of said sides being in juxtaposition to said one cap, and a plurality of vanes extending from the other side of said plate.
20. A pump as set forth in claim 19, wherein said motor has wire means extending through the other of said caps for supplying electric power to the motor;
and wherein said conduit means connected to said second end includes:
a reducer at said second end and having a large end and a small end, said large end of said second end reducer is of a size sub-stantially corresponding to that of said first size and said small end of said second end reducer is in the form of cylindrical sleeve means of a size substantially corresponding to the size of one of said standard sizes, said one standard size being substantially smaller than said first size, a piece of hose slipped into said sleeve means, and a hose clamp on said piece of hose, said wire means extending from said motor through said second end reducer and out through the side of said hose.
and wherein said conduit means connected to said second end includes:
a reducer at said second end and having a large end and a small end, said large end of said second end reducer is of a size sub-stantially corresponding to that of said first size and said small end of said second end reducer is in the form of cylindrical sleeve means of a size substantially corresponding to the size of one of said standard sizes, said one standard size being substantially smaller than said first size, a piece of hose slipped into said sleeve means, and a hose clamp on said piece of hose, said wire means extending from said motor through said second end reducer and out through the side of said hose.
21. In an apparatus as set forth in claim 18, wherein a first of said caps has threaded, blind openings on the interior thereof to receive said bolts, the second of the caps has a wall with openings through which said bolts extend, and including means associated with said second cap for preventing the entry of water from the exterior of the cap through said openings in said second cap into the motor.
22. In an apparatus as set forth in claim 21, wherein said second cap has threaded bores extending from the exterior of said cap and in axial alignment with said bolts, said walls being at the interior of said bores, and wherein said means for the prevention of the entry of water includes threaded plugs screwed into said threaded bores.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA308,077A CA1103990A (en) | 1978-07-25 | 1978-07-25 | Through flow sump pump |
| CA374,796A CA1132841A (en) | 1978-07-25 | 1981-04-06 | Through flow sump pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA308,077A CA1103990A (en) | 1978-07-25 | 1978-07-25 | Through flow sump pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1103990A true CA1103990A (en) | 1981-06-30 |
Family
ID=4111977
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA308,077A Expired CA1103990A (en) | 1978-07-25 | 1978-07-25 | Through flow sump pump |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1103990A (en) |
-
1978
- 1978-07-25 CA CA308,077A patent/CA1103990A/en not_active Expired
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| Date | Code | Title | Description |
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| MKEX | Expiry |