CA1207409A - Dishwasher water fill control system - Google Patents
Dishwasher water fill control systemInfo
- Publication number
- CA1207409A CA1207409A CA000423182A CA423182A CA1207409A CA 1207409 A CA1207409 A CA 1207409A CA 000423182 A CA000423182 A CA 000423182A CA 423182 A CA423182 A CA 423182A CA 1207409 A CA1207409 A CA 1207409A
- Authority
- CA
- Canada
- Prior art keywords
- water
- valve
- armature
- pump
- operable
- 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
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Abstract
ABSTRACT OF THE INVENTION:
A water fill control system for a dishwasher having a solenoid actuated water inlet valve electrically in series with pump motor for recirculating wash water.
The pump inlet is connected to receive tub water head and pump discharge is applied to a sensing disphragm to actuate a movable pole piece for defeating solenoid primary armature operation when the solenoid coil is energized. The solenoid employs a secondary armature operative only in response to the coil experiencing locked rotor current in the pump motor. When the solenoid coil is energized for normal water inlet operation, either normal wash water pressure from the pump outlet or a locked pump rotor will effect closing of the water inlet valve.
A water fill control system for a dishwasher having a solenoid actuated water inlet valve electrically in series with pump motor for recirculating wash water.
The pump inlet is connected to receive tub water head and pump discharge is applied to a sensing disphragm to actuate a movable pole piece for defeating solenoid primary armature operation when the solenoid coil is energized. The solenoid employs a secondary armature operative only in response to the coil experiencing locked rotor current in the pump motor. When the solenoid coil is energized for normal water inlet operation, either normal wash water pressure from the pump outlet or a locked pump rotor will effect closing of the water inlet valve.
Description
~20~
BACKGROUND OF TElE INVENTION:
The present invention relates to water fill control systems for domestic washing appliances such as household dishwashers~
In such devices it is known to provide an electromagnetically operated water inlet valve for controlling water fill to the washing tub from the household water supply line. The inlet valve is energized ~y a programmer timer to control the filling of the washing tub. The water inlet valve commonly has lO a flow control device, such as a deformable elastomeric washer well known in the art, for providing a relatively constant flow rate for an anticipated range of water supply pressures. Known machines thus control water volume ill by maintaining inlet valve open for 15 permitting flow at the controlled rate for a predetermined time interval~
Where water fill is accomplished by timing a controlled 10w rate, the flow control must be set at a rate such that there is sufficient water fill to 20 accommodate the various soil conditions of the articles and minimum filling interval taking into account timer unction tolerances. In the prior art fill systems this has resulted in excess water fill where only a minimal 50il condition is encountered.
A motor driven pump is usually provided to recirculate the washing water through spray nozzles to effect cleaning of the dishesO However/ it has been found that substances such as egg white, milk, detergent and certain rinse-aid additives can cause foaming and 30 cavitation in the recirculation pump thereby producing i;}~
37~
insufficient pressure in the washing spray nozzles.
Thus, if a timed controlled-rate fill is fixed to provide a fill volume to a~commodate normal soil conditions without the presence of foam producing agents, in the event of their presence, insuficient washing results. If, on the other hand, the timed controlled-rate fill is fixed to provide a fill volume sufficient to provide adequate wash pressure even in the presence of foam producing agents, then in the absence 10 of such agents, excess water is present which results in excess power consumption for heating the water and washing pump operation.
In one type of known machine, the wash pressure pump motor is reversed for the drain function; whereas in 15 another type of ~nown machine, the pump motor rotation is unchanged and a programmer controlled drain valve is actuated. In the reversible motor arrangement, drain failure due to an open motor coil can result in multiple filling upon subsequent programmer activation of fill cycles~ ~n the drain valve arrangement, an open circuit in the drain valve could also result in multiple filling upon subsequent timer/programmer controlled inlet valve opening.
In the event of a clogged drain, operator intervention to skip the drain pump cycle, timer malfunction or drain pump failure, provision must be made for immediate inlet valve closing to prevent overfill. Overfill protection for water filling of khe tub has heretofore been provided by employing a float having an actuator rod passing through an open tube in the bottom of the washing tub for actuating a switch in series with the solenoid valve for closing the water inlet valve.
The disadvantage of the float actuated s~"itch is that it requires an open tube be installed in the bottom of the water tub which provides a potential source of flooding in the event of malfunction of -the float or switch; and, -thus an inheren-t danger of electrical shorting e~ists in the event water should exit the float switch actuator tube.
The present invention provides a solution to the above described problem of providing a con-trol system which automatically controls the volume fill of water in lG the washing receptacle so as to effect proper washing over a wide range of soil conditions for the articles to be washed, and variations in water supply pressure.
The presen-t invention provides for water filling, for example until there is sufficient pressure to the washing spray nozzles, which automatically provides extra water when needed and a reduced amount of water if w~sh conditions warrant. The present invention permits elimination of the float, switch and open tube through the bottom of the tub thereby eliminating a leakage path. elimination of the float and open tube also simplifies washing rack design since float clearance is no longer required. Optionally, however, the float may be retained for redunda.nt overfill protection if desired.
According to one aspect of the present invention there is employed an electromagnetically actuated water inlet valve for filling the washing receptacle which is electrically in series with the recirculation pump motor which empties the dirty wash and rinse water and provides spray ~or the washing function. The electxomagnetically actuated inlet valve may employ a solenoid coil having a primary ~rmature activated by normal programmer/timer coil energization for a predetermined washing cycle. The recirculation pump has its inlet receiving the full head of water in the tub and the discharge heaa of the recirculation pump may be sensed to provide a command signal for actuating a movable pole piece in the electromagnetic valve for disabling the valve opening armature -thereby causing the wate.r inlet valve to close. The present invention thus provides a : mab/ !
:~ ~`7~
fluid pressure actuated means Eor disabling the wa-ter inlet solenoid valve when it is normally energized by the pro~
grammer/timer.
The present invention thus provides a unique control system for a household dishwasher which provides for automatic closing of the water inlet valve when the desired pressure is attained in the washing water jet circuit from the pump outlet. Overfill protection is automatically provided in the event of an open circuit motor since the motor is in series with the inlet valve. ~n optional feature provides a secondary armature operable to close the inlet valve automatically in the event of a locked-rotor condition in the recirculation pump motor. The programmer/timer may also shut off the inlet valve as in prior art systems.
According to another aspect of the present invention, there is provided a water fill control system for an automatic washe^ having a tub in which articles ar~ placed for ~7ashinc~.
The system includes fill means having electromagnetically actuated valve means for connection to a source of pressurized ~0 water, the valve means being operable upon electrical ener- -gization for magnetically effecting movement of an armature for admitting water to the tub from the source and upon deenergization to stop water flow from the source to the tub. -The valve means includes a moveable magnetic pole piece and force actuator means operable upon receipt of a fluid pressure signal to apply the press~re to move the pole piece for defeating magnetomotive force to ca~lse the valve means to stop flow of water when t~e valve means is in the electrically energized condition. Programmer means is provided which includes switch means operable to connect the valve electrical means to the source of power in accordance with a preselected program with means being provided for sensing the pressure head o~ water in the tub and operable to provide the fluid pressure signal upon the water head rising above a desired level.
mab/~'~
~2~7~
BRIEF DESCRIPTION OF THE DR~WINGS:
FIGURE 1 is a perspective view of a household washing machine witll portions o the cabinet broken away to show the interior components;
5FIGURE 2 iS a schematic of the control system employed in the machine of Figure l; and FIGURE 3 is a cross-sectional view o the electromagnetically operated water fill valve of the 10 system of Figure 1.
DETAILED DESCRIPTION:
Referring n.ow to Figure 1, a dishwashing machine of 15 the type employed in domestic households for operation on a source of alternating current electrical power and connection to the household water supply is indicaked generally at 10 as having a washing receptacle or tub 12 with a recirculating pump 14 having the inlet 16 thereof 20 connected to a port 18 provided in the bottom of the tub 12. The discharge outlet 20 of the pump is connected via conduit 22 to the inlet of a rotating spray bar ~4 having a plurality of discharge orifices 26 provided thereon for directing washing water to the articles 25 received in the tub.
An electromagnetically actuated filling valve 30 i~
provided adjacent the upper rim of the tub 12 and is electrically connected for actuation to an electrical programmer/timer 32 which has a manually settable 30 control knob 34 provided on the front of the dishwasher for the convenience of the machine operator.
7'~
The inle~ valve 30 has in the inlet thereof connected to the household supply line (not shown) with the outlet connected to a fill spout or tube 36 which directs water flow into the tub 12 upon opening of the valve 3~. The water inlet valve 30 has a sensing port connection 38 which is connected via tube 40 to a pump discharge tap 42 for sensing pump discharge pressure.
As will be hereinafter described, the signal through tube 40 effects closing of the valve 30 when the desired 10 pump discharge or pressure has been attained. As a backup in the event of a malfunctionf programmer/timer 32 will also close valve 30 ~lectrically.
Referring now to Figure 2, the control system of the present invention is represented schematically wherein 15 programmer/timer 32 is shown as having a timing motor 44 driving, through an intermediate drive 46 comprising a gear reduction train, a rotary cam 48. A cam follower 50 is connected to a movable contact arm 52 of a single pole double throw switch indicated generally at 54.
Switch 54 has the movab1le contact arm 52 connected via lead 56 to junction 58 which is connected to one terminal of motor 44 and to one side of the household power line Ll.
The rem~ining terminal 60 of the timing motor is connected via lead 62 and junction 64 to the opposite L2 of the household power line.
Switch 54 has one contact 66 thereof connected via lead 6~ to one connecting terminal 70 of inlet valve 30. The opposite contact 72 of switch 54 is connected via lead 74 to junction 76 and one terminal 78 of pump 14. The opposite terminal 80 of pump 14 is connected to side L2 of the household power line. The switch 54 thus has one circuit thereof in series with water inlet valve 30 and the other circuit in series with pump 14.
Water inlet valve 30 has a solenoid coil 82 connected at one end to terminal 70 and at the opposite end to terminal 84 which is connected via lead 86 to power lead junction 76. The switch 54 thus has one circuit thereof through contact 66 in series with water inlet valve coil 82 and the other contact 72 thereof in series with pump 14.
Referring now to Figure 3, the electromagnetically actuated water inlet valve 30 has the coil 82 mounted on 10 a base plate or ~upport frame 84 attached to the body 86 oE the valve in any suitable manner. The details of such atachment have been omitted in Figure 3 for simplicity.
The valve 30 is of the pilot actuated type known in 15 the art as having a pilot valve seat indicated generally at 88 and a main valve seat indicated generally at 90 against which rests the pressure responsive diaphragm 92. In the present practice, water filling rates of 4-12 liters/minute have been found suitable for 20 dishwasher applications~ However, the flow rate will be understood to be determined by the amount of water desired in the machine tub. The diaphragm and valve seat member 88 inclllde a bleed passage 9~ fvr providing pressure equalization on both sides of the diaphragm.
25 Valve body 86 has an inlet passage 96 communicating with the main valve 90~
Valve 30 includes a primary armature 98 formed ~f ferr~magnetic ma~erial and having pilot valve member 100 provided in the end thereof for closing pilot valve 88c In operation, with the valve closed as shown in Figur~ 3, upon energization of coil 82, armature 98 is moved upward to permit water from inlet 96 connected to chamber 97 having passed through bleed hole 94 to pass outwardly through passaye 102 provided in the main valve ~L2G~
dîaphragm 92 wh.ich causes a pressure drop above diaphragm 92; and, pressure from inlet 96 then causes the diaphragm to move upwardly thereby opening main valve 90. The outlet 104 of inlet valve 30 is connected to water fill nozzle tube 36 tsee Fig. 1).
Referring again to Figure 3, primary armature 98 is received in a water tight guide 106 which has the lower end thereof engaging the outer periphery of the diaphragm 92 in fluid pressure sealing engagement and 10 which is retained therein by plate 84. An armature return spring 108 registers on one end against the upper end of yuide 106 and at its lower end against the top of primary armature 98 thus urging the armature downward so that pilot valve member 100 is in contact with valve 15 seat 88 in the coil deenergized condition.
The armature guide 106 has received thereover stationary ferromagnetic pole member 110 and movable upper pole piece 112 which, in the valve deactuated condition, is spaced Erom member 110 by an amount 20 comprising a suitable air gap 114 which upon energization of coil 82 causes primar~ armature 98 to move upward to a null position with respect to gap 114 thereby opening pilot valve 88.
Pole piece 112 is movable vertically within the coil 25 from a position as illustrated in Figure 3 defining air gap 114, to a downward position contacting the upper surface of pole piece 110, in which position no air gap exists. A suitable spring 114 having one end thereof registering against the upper surface of the armature guide and the other end registering against the undersurface of the upper end of pole piece 112 urges the pole piece upwardly to a position defining air gap 114.
With continuing reference to Figure 3, a ~econdary ferro~agnetic armature 116 having a generally ~up-shaped configuration i~ received ~ver the coil. The undersurface 120 of the upper end of armature 116 is registered against the URper end of ~ole piece 112 and ha~ an apPrature 122 form@d therethrough.
A compression 5pring 124 i5 receiYed over the pole piece 112 and h~s the upper ~nd thereof registered against the under~urface 120 of the ~econdary armature;
10 and, the lower end i~ registered against the top of the ~oil for urgin~ the secondary armature 116 in an upward direction.
A pressure responsive actuator indicated generally at 126 ifi positioned by ~uitable mounting (not shown) to 15 base plate ~4 fo~ p~oviding actuation of the movabl2 pole piece 112. The pres~ure responsive actuator has a housing 128 with sensing p~rt 38 formed in the upper ~urface thereof which port has sensing tube 40 ~see Fig.
1) connected there~o for providing a fluid command 20 signal from the discharge ~ide of pump 1~.
Sensing ~ 38 may ~e provided with an orifice restri~tion and the conf iguration vf housing 138 can be adjusted t3 compen ate ~or i.rregularities in pump output.
The interior oE housing 128 is divided by a flexible 25 diaphragm 130 ~ealed about its periphery to the outer rim of the housing to- form - an upper pre~sure c:hamber conrlected to port 38 ana a lower chamber vented to the atmosphere through a t:ontrolled vent or ~e~led chamber tc~ provide damping of pump output variationsO
The under~iae of diaphragm 13Q has a ~ui~able backing pla~e 132 provided in the central region thereof which plate contact~ one end of an actuator rod 134 extending downwardly ~hrough armature 122 with the lower end thereof reg;~tered against the upper suracP ~f ~7~
movable pole piece 112. A biasing spring 136 has the upper end thereof registered against backing plate 132 and the lower end registering against a shoulder 138 provided in housing 130. Spring 136 thereby effects biasing of the diaphragm in an upward direction. The spring 136 is chosen such that a predetermined pump output pressure must act on diaphragm 130 to cause operable downward movement thereof. In the present practice of the invention the spring 130 is overcome at 10 pressures of 3~8 psl acting on the diaphragm.
In operation, with the valve in the closed position and coil 82 deenergized, as shown in Figure 3, pole piece 112 is in its uppermost position and armature 98 is contacting valve seat 83 with diaphragm 92 seated on 15 main valve seat 90. Secondary armature 116 is in its uppermost position in registration with the undersurface of housing 12~.
Upon energization of coil 82 by the programmer~timer 32 for normal dishwasher operation, armature 98 moves 20 upward opening pilot valve 88 which permits main valve 90 to open and water to flow from the inlet 9~ through outlet 104 and fill tube 36 inl:o the washing tub.
When the pressure output of the pump 14 has attained the desired level for washing, the pressure is 25 transmitted through tube 40 and sensed by the pressure responsive actuator 126. With valve coil energized and valve 30 open as fluid pressure from the pump is applied to diaphragm 130, actuator rod 134 is moved downward through aperture 122 in the secondary armature, which 30 remains motionless, and actuator rod 134 moves movable pole piece 112 downwardly to close air gap 114 which renders the magnetic orce upon the armature nil so that return spring 108 closes the pilot valve 88 thereby causing closure of main valve 90 and cession of water 35 flow through fill tube 36.
~2q~74~D9 Alternatively, in the event tha-t a locked rotor con-dition occurs in pump 14 with the inlet valve 30 open, the increased current flowing through coil 82 generates suf-~icient magnetic force to cause secondary armature 116 to overcome spring 124 and move downward thereby moving movable pole piece 112 to close air gap 114.
From the foregoing description it will be seen that when the solenoid coil 82 is energized by programmer/timer 32 for filling of the tub during normal washing operations, the occurrence of either (a) sufficient pump discharge pressure for normal washing; or (b) locked rotor current will cause the movable pole piece 112 to be moved downward closing air gap 114 to thereby effect closing of the inlet -~al-~e 30.
The novel control system of the present invention has herein been described in its ~referred form as having a solenoid actuated water inlet valve wherein a movable pole piece member is actuated by a pressure responsive diaphragm upon occurrence of sufficient water pressure at the pump outlet to defeat electromagnetic actuation of the inlet valve. The present invention also optionally employs a secondary armature for the solenoid operator which secondary armature is responsive only to excessive current caused by a locked rotor in the pump, which is electrically in series with the solenoid coil; and, the secondary armature in-dependently. moves the movable pole piece to eff~ct closing of the water inlet valve.
Although the invention has hereinabove been described in its preferred form as applied to an automatic dishwasher it will be apparent to those skilled in the art that the control system is applicable to automatic clothes ~ashers using static -tub water lcm/
~-f " ,1,~*, ~Z~;~ 9 head, and, other modificat.ions and variations to the invention may be made with the invention being limited only by the following claims.
I CLAIM:
BACKGROUND OF TElE INVENTION:
The present invention relates to water fill control systems for domestic washing appliances such as household dishwashers~
In such devices it is known to provide an electromagnetically operated water inlet valve for controlling water fill to the washing tub from the household water supply line. The inlet valve is energized ~y a programmer timer to control the filling of the washing tub. The water inlet valve commonly has lO a flow control device, such as a deformable elastomeric washer well known in the art, for providing a relatively constant flow rate for an anticipated range of water supply pressures. Known machines thus control water volume ill by maintaining inlet valve open for 15 permitting flow at the controlled rate for a predetermined time interval~
Where water fill is accomplished by timing a controlled 10w rate, the flow control must be set at a rate such that there is sufficient water fill to 20 accommodate the various soil conditions of the articles and minimum filling interval taking into account timer unction tolerances. In the prior art fill systems this has resulted in excess water fill where only a minimal 50il condition is encountered.
A motor driven pump is usually provided to recirculate the washing water through spray nozzles to effect cleaning of the dishesO However/ it has been found that substances such as egg white, milk, detergent and certain rinse-aid additives can cause foaming and 30 cavitation in the recirculation pump thereby producing i;}~
37~
insufficient pressure in the washing spray nozzles.
Thus, if a timed controlled-rate fill is fixed to provide a fill volume to a~commodate normal soil conditions without the presence of foam producing agents, in the event of their presence, insuficient washing results. If, on the other hand, the timed controlled-rate fill is fixed to provide a fill volume sufficient to provide adequate wash pressure even in the presence of foam producing agents, then in the absence 10 of such agents, excess water is present which results in excess power consumption for heating the water and washing pump operation.
In one type of known machine, the wash pressure pump motor is reversed for the drain function; whereas in 15 another type of ~nown machine, the pump motor rotation is unchanged and a programmer controlled drain valve is actuated. In the reversible motor arrangement, drain failure due to an open motor coil can result in multiple filling upon subsequent programmer activation of fill cycles~ ~n the drain valve arrangement, an open circuit in the drain valve could also result in multiple filling upon subsequent timer/programmer controlled inlet valve opening.
In the event of a clogged drain, operator intervention to skip the drain pump cycle, timer malfunction or drain pump failure, provision must be made for immediate inlet valve closing to prevent overfill. Overfill protection for water filling of khe tub has heretofore been provided by employing a float having an actuator rod passing through an open tube in the bottom of the washing tub for actuating a switch in series with the solenoid valve for closing the water inlet valve.
The disadvantage of the float actuated s~"itch is that it requires an open tube be installed in the bottom of the water tub which provides a potential source of flooding in the event of malfunction of -the float or switch; and, -thus an inheren-t danger of electrical shorting e~ists in the event water should exit the float switch actuator tube.
The present invention provides a solution to the above described problem of providing a con-trol system which automatically controls the volume fill of water in lG the washing receptacle so as to effect proper washing over a wide range of soil conditions for the articles to be washed, and variations in water supply pressure.
The presen-t invention provides for water filling, for example until there is sufficient pressure to the washing spray nozzles, which automatically provides extra water when needed and a reduced amount of water if w~sh conditions warrant. The present invention permits elimination of the float, switch and open tube through the bottom of the tub thereby eliminating a leakage path. elimination of the float and open tube also simplifies washing rack design since float clearance is no longer required. Optionally, however, the float may be retained for redunda.nt overfill protection if desired.
According to one aspect of the present invention there is employed an electromagnetically actuated water inlet valve for filling the washing receptacle which is electrically in series with the recirculation pump motor which empties the dirty wash and rinse water and provides spray ~or the washing function. The electxomagnetically actuated inlet valve may employ a solenoid coil having a primary ~rmature activated by normal programmer/timer coil energization for a predetermined washing cycle. The recirculation pump has its inlet receiving the full head of water in the tub and the discharge heaa of the recirculation pump may be sensed to provide a command signal for actuating a movable pole piece in the electromagnetic valve for disabling the valve opening armature -thereby causing the wate.r inlet valve to close. The present invention thus provides a : mab/ !
:~ ~`7~
fluid pressure actuated means Eor disabling the wa-ter inlet solenoid valve when it is normally energized by the pro~
grammer/timer.
The present invention thus provides a unique control system for a household dishwasher which provides for automatic closing of the water inlet valve when the desired pressure is attained in the washing water jet circuit from the pump outlet. Overfill protection is automatically provided in the event of an open circuit motor since the motor is in series with the inlet valve. ~n optional feature provides a secondary armature operable to close the inlet valve automatically in the event of a locked-rotor condition in the recirculation pump motor. The programmer/timer may also shut off the inlet valve as in prior art systems.
According to another aspect of the present invention, there is provided a water fill control system for an automatic washe^ having a tub in which articles ar~ placed for ~7ashinc~.
The system includes fill means having electromagnetically actuated valve means for connection to a source of pressurized ~0 water, the valve means being operable upon electrical ener- -gization for magnetically effecting movement of an armature for admitting water to the tub from the source and upon deenergization to stop water flow from the source to the tub. -The valve means includes a moveable magnetic pole piece and force actuator means operable upon receipt of a fluid pressure signal to apply the press~re to move the pole piece for defeating magnetomotive force to ca~lse the valve means to stop flow of water when t~e valve means is in the electrically energized condition. Programmer means is provided which includes switch means operable to connect the valve electrical means to the source of power in accordance with a preselected program with means being provided for sensing the pressure head o~ water in the tub and operable to provide the fluid pressure signal upon the water head rising above a desired level.
mab/~'~
~2~7~
BRIEF DESCRIPTION OF THE DR~WINGS:
FIGURE 1 is a perspective view of a household washing machine witll portions o the cabinet broken away to show the interior components;
5FIGURE 2 iS a schematic of the control system employed in the machine of Figure l; and FIGURE 3 is a cross-sectional view o the electromagnetically operated water fill valve of the 10 system of Figure 1.
DETAILED DESCRIPTION:
Referring n.ow to Figure 1, a dishwashing machine of 15 the type employed in domestic households for operation on a source of alternating current electrical power and connection to the household water supply is indicaked generally at 10 as having a washing receptacle or tub 12 with a recirculating pump 14 having the inlet 16 thereof 20 connected to a port 18 provided in the bottom of the tub 12. The discharge outlet 20 of the pump is connected via conduit 22 to the inlet of a rotating spray bar ~4 having a plurality of discharge orifices 26 provided thereon for directing washing water to the articles 25 received in the tub.
An electromagnetically actuated filling valve 30 i~
provided adjacent the upper rim of the tub 12 and is electrically connected for actuation to an electrical programmer/timer 32 which has a manually settable 30 control knob 34 provided on the front of the dishwasher for the convenience of the machine operator.
7'~
The inle~ valve 30 has in the inlet thereof connected to the household supply line (not shown) with the outlet connected to a fill spout or tube 36 which directs water flow into the tub 12 upon opening of the valve 3~. The water inlet valve 30 has a sensing port connection 38 which is connected via tube 40 to a pump discharge tap 42 for sensing pump discharge pressure.
As will be hereinafter described, the signal through tube 40 effects closing of the valve 30 when the desired 10 pump discharge or pressure has been attained. As a backup in the event of a malfunctionf programmer/timer 32 will also close valve 30 ~lectrically.
Referring now to Figure 2, the control system of the present invention is represented schematically wherein 15 programmer/timer 32 is shown as having a timing motor 44 driving, through an intermediate drive 46 comprising a gear reduction train, a rotary cam 48. A cam follower 50 is connected to a movable contact arm 52 of a single pole double throw switch indicated generally at 54.
Switch 54 has the movab1le contact arm 52 connected via lead 56 to junction 58 which is connected to one terminal of motor 44 and to one side of the household power line Ll.
The rem~ining terminal 60 of the timing motor is connected via lead 62 and junction 64 to the opposite L2 of the household power line.
Switch 54 has one contact 66 thereof connected via lead 6~ to one connecting terminal 70 of inlet valve 30. The opposite contact 72 of switch 54 is connected via lead 74 to junction 76 and one terminal 78 of pump 14. The opposite terminal 80 of pump 14 is connected to side L2 of the household power line. The switch 54 thus has one circuit thereof in series with water inlet valve 30 and the other circuit in series with pump 14.
Water inlet valve 30 has a solenoid coil 82 connected at one end to terminal 70 and at the opposite end to terminal 84 which is connected via lead 86 to power lead junction 76. The switch 54 thus has one circuit thereof through contact 66 in series with water inlet valve coil 82 and the other contact 72 thereof in series with pump 14.
Referring now to Figure 3, the electromagnetically actuated water inlet valve 30 has the coil 82 mounted on 10 a base plate or ~upport frame 84 attached to the body 86 oE the valve in any suitable manner. The details of such atachment have been omitted in Figure 3 for simplicity.
The valve 30 is of the pilot actuated type known in 15 the art as having a pilot valve seat indicated generally at 88 and a main valve seat indicated generally at 90 against which rests the pressure responsive diaphragm 92. In the present practice, water filling rates of 4-12 liters/minute have been found suitable for 20 dishwasher applications~ However, the flow rate will be understood to be determined by the amount of water desired in the machine tub. The diaphragm and valve seat member 88 inclllde a bleed passage 9~ fvr providing pressure equalization on both sides of the diaphragm.
25 Valve body 86 has an inlet passage 96 communicating with the main valve 90~
Valve 30 includes a primary armature 98 formed ~f ferr~magnetic ma~erial and having pilot valve member 100 provided in the end thereof for closing pilot valve 88c In operation, with the valve closed as shown in Figur~ 3, upon energization of coil 82, armature 98 is moved upward to permit water from inlet 96 connected to chamber 97 having passed through bleed hole 94 to pass outwardly through passaye 102 provided in the main valve ~L2G~
dîaphragm 92 wh.ich causes a pressure drop above diaphragm 92; and, pressure from inlet 96 then causes the diaphragm to move upwardly thereby opening main valve 90. The outlet 104 of inlet valve 30 is connected to water fill nozzle tube 36 tsee Fig. 1).
Referring again to Figure 3, primary armature 98 is received in a water tight guide 106 which has the lower end thereof engaging the outer periphery of the diaphragm 92 in fluid pressure sealing engagement and 10 which is retained therein by plate 84. An armature return spring 108 registers on one end against the upper end of yuide 106 and at its lower end against the top of primary armature 98 thus urging the armature downward so that pilot valve member 100 is in contact with valve 15 seat 88 in the coil deenergized condition.
The armature guide 106 has received thereover stationary ferromagnetic pole member 110 and movable upper pole piece 112 which, in the valve deactuated condition, is spaced Erom member 110 by an amount 20 comprising a suitable air gap 114 which upon energization of coil 82 causes primar~ armature 98 to move upward to a null position with respect to gap 114 thereby opening pilot valve 88.
Pole piece 112 is movable vertically within the coil 25 from a position as illustrated in Figure 3 defining air gap 114, to a downward position contacting the upper surface of pole piece 110, in which position no air gap exists. A suitable spring 114 having one end thereof registering against the upper surface of the armature guide and the other end registering against the undersurface of the upper end of pole piece 112 urges the pole piece upwardly to a position defining air gap 114.
With continuing reference to Figure 3, a ~econdary ferro~agnetic armature 116 having a generally ~up-shaped configuration i~ received ~ver the coil. The undersurface 120 of the upper end of armature 116 is registered against the URper end of ~ole piece 112 and ha~ an apPrature 122 form@d therethrough.
A compression 5pring 124 i5 receiYed over the pole piece 112 and h~s the upper ~nd thereof registered against the under~urface 120 of the ~econdary armature;
10 and, the lower end i~ registered against the top of the ~oil for urgin~ the secondary armature 116 in an upward direction.
A pressure responsive actuator indicated generally at 126 ifi positioned by ~uitable mounting (not shown) to 15 base plate ~4 fo~ p~oviding actuation of the movabl2 pole piece 112. The pres~ure responsive actuator has a housing 128 with sensing p~rt 38 formed in the upper ~urface thereof which port has sensing tube 40 ~see Fig.
1) connected there~o for providing a fluid command 20 signal from the discharge ~ide of pump 1~.
Sensing ~ 38 may ~e provided with an orifice restri~tion and the conf iguration vf housing 138 can be adjusted t3 compen ate ~or i.rregularities in pump output.
The interior oE housing 128 is divided by a flexible 25 diaphragm 130 ~ealed about its periphery to the outer rim of the housing to- form - an upper pre~sure c:hamber conrlected to port 38 ana a lower chamber vented to the atmosphere through a t:ontrolled vent or ~e~led chamber tc~ provide damping of pump output variationsO
The under~iae of diaphragm 13Q has a ~ui~able backing pla~e 132 provided in the central region thereof which plate contact~ one end of an actuator rod 134 extending downwardly ~hrough armature 122 with the lower end thereof reg;~tered against the upper suracP ~f ~7~
movable pole piece 112. A biasing spring 136 has the upper end thereof registered against backing plate 132 and the lower end registering against a shoulder 138 provided in housing 130. Spring 136 thereby effects biasing of the diaphragm in an upward direction. The spring 136 is chosen such that a predetermined pump output pressure must act on diaphragm 130 to cause operable downward movement thereof. In the present practice of the invention the spring 130 is overcome at 10 pressures of 3~8 psl acting on the diaphragm.
In operation, with the valve in the closed position and coil 82 deenergized, as shown in Figure 3, pole piece 112 is in its uppermost position and armature 98 is contacting valve seat 83 with diaphragm 92 seated on 15 main valve seat 90. Secondary armature 116 is in its uppermost position in registration with the undersurface of housing 12~.
Upon energization of coil 82 by the programmer~timer 32 for normal dishwasher operation, armature 98 moves 20 upward opening pilot valve 88 which permits main valve 90 to open and water to flow from the inlet 9~ through outlet 104 and fill tube 36 inl:o the washing tub.
When the pressure output of the pump 14 has attained the desired level for washing, the pressure is 25 transmitted through tube 40 and sensed by the pressure responsive actuator 126. With valve coil energized and valve 30 open as fluid pressure from the pump is applied to diaphragm 130, actuator rod 134 is moved downward through aperture 122 in the secondary armature, which 30 remains motionless, and actuator rod 134 moves movable pole piece 112 downwardly to close air gap 114 which renders the magnetic orce upon the armature nil so that return spring 108 closes the pilot valve 88 thereby causing closure of main valve 90 and cession of water 35 flow through fill tube 36.
~2q~74~D9 Alternatively, in the event tha-t a locked rotor con-dition occurs in pump 14 with the inlet valve 30 open, the increased current flowing through coil 82 generates suf-~icient magnetic force to cause secondary armature 116 to overcome spring 124 and move downward thereby moving movable pole piece 112 to close air gap 114.
From the foregoing description it will be seen that when the solenoid coil 82 is energized by programmer/timer 32 for filling of the tub during normal washing operations, the occurrence of either (a) sufficient pump discharge pressure for normal washing; or (b) locked rotor current will cause the movable pole piece 112 to be moved downward closing air gap 114 to thereby effect closing of the inlet -~al-~e 30.
The novel control system of the present invention has herein been described in its ~referred form as having a solenoid actuated water inlet valve wherein a movable pole piece member is actuated by a pressure responsive diaphragm upon occurrence of sufficient water pressure at the pump outlet to defeat electromagnetic actuation of the inlet valve. The present invention also optionally employs a secondary armature for the solenoid operator which secondary armature is responsive only to excessive current caused by a locked rotor in the pump, which is electrically in series with the solenoid coil; and, the secondary armature in-dependently. moves the movable pole piece to eff~ct closing of the water inlet valve.
Although the invention has hereinabove been described in its preferred form as applied to an automatic dishwasher it will be apparent to those skilled in the art that the control system is applicable to automatic clothes ~ashers using static -tub water lcm/
~-f " ,1,~*, ~Z~;~ 9 head, and, other modificat.ions and variations to the invention may be made with the invention being limited only by the following claims.
I CLAIM:
Claims (20)
1. A water fill control system for an automatic washer having a tub in which articles are placed for washing, said system comprising:
(a) fill means including valve means adapted for connection to a source of pressurized water, said valve means operable upon electrical energization for admitting water to said tub from said source and upon deenergization to stop water flow from said source to said tub, said valve means including actuator means operable upon receipt of a fluid pressure signal to cause said valve means to stop flow of water when said valve means is in the electrically energized condition;
(b) pump means including motor means operable upon connection to a source of electrical power to circulate the water in said tub for washing the articles with the inlet of said pump connected to receive the head of water in said tub, and wherein said motor means and said valve electrical means are connected electrically in series;
(c) programmer means including switch means operable to connect said motor means and said valve electrical means to said source of power in accordance with a preselected program; and, (d) conduit means connecting the discharge side of said pump means to said valve actuator means to provide said fluid pressure signal for effecting deactuation thereof in response to PRESSURE HEAD OF PUMP DISCHARGE.
(a) fill means including valve means adapted for connection to a source of pressurized water, said valve means operable upon electrical energization for admitting water to said tub from said source and upon deenergization to stop water flow from said source to said tub, said valve means including actuator means operable upon receipt of a fluid pressure signal to cause said valve means to stop flow of water when said valve means is in the electrically energized condition;
(b) pump means including motor means operable upon connection to a source of electrical power to circulate the water in said tub for washing the articles with the inlet of said pump connected to receive the head of water in said tub, and wherein said motor means and said valve electrical means are connected electrically in series;
(c) programmer means including switch means operable to connect said motor means and said valve electrical means to said source of power in accordance with a preselected program; and, (d) conduit means connecting the discharge side of said pump means to said valve actuator means to provide said fluid pressure signal for effecting deactuation thereof in response to PRESSURE HEAD OF PUMP DISCHARGE.
2. The system defined in claim 1, wherein:
(a) said valve means includes a solenoid operator having an armature movable upon said electrical energization to cause said valve means to admit water to said tub and movable pole piece means movable between a first position enabling said armature movement, and a second position disabling said armature;
(b) said valve actuator means includes pressure responsive means operable upon receipt of a pressure signal in excess of a predetermined value through said conduit to move said movable pole piece means for causing said valve means to stop water flow to the tub.
(a) said valve means includes a solenoid operator having an armature movable upon said electrical energization to cause said valve means to admit water to said tub and movable pole piece means movable between a first position enabling said armature movement, and a second position disabling said armature;
(b) said valve actuator means includes pressure responsive means operable upon receipt of a pressure signal in excess of a predetermined value through said conduit to move said movable pole piece means for causing said valve means to stop water flow to the tub.
3. The system defined in claim 1, wherein said valve means includes electromagnetic means having an armature member movable by magnetomotive force upon said electrical energization.
4. The system defined in claim 1, wherein:
(a) said valve means includes electromagnetic means having an armature member movable by magnetomotive force upon said electrical energization, said electromagnetic means further including a movable pole piece operable in a first position to cause said armature to actuate said valve means, and operable in a second position to cause said armature to deactuate said valve means despite electrical energization of said electromagnetic means; and, (b) auxiliary means operable in response to normal wash pressure to move said movable pole piece to said second position.
(a) said valve means includes electromagnetic means having an armature member movable by magnetomotive force upon said electrical energization, said electromagnetic means further including a movable pole piece operable in a first position to cause said armature to actuate said valve means, and operable in a second position to cause said armature to deactuate said valve means despite electrical energization of said electromagnetic means; and, (b) auxiliary means operable in response to normal wash pressure to move said movable pole piece to said second position.
5. A water fill control system for an automatic washer having a receptacle in which articles are placed for washing, said system comprising:
(a) fill means including valve means adapted for connection to a source of pressurized water, said fill means including electrical means operable upon energization for causing said valve means to admit water to said receptacle from said source and operable upon deenergization for causing said valve means to prevent water flow to said receptacle from said source; and, (b) pump means including motor means operable upon connection to a source of electrical power to circulate the water in said receptacle for washing the dishes, said pump means having the inlet thereof connected to receive the head of water in said receptacle, said pump motor means and said fill electrical means being connected electrically in series circuit such that in the event of an open circuit condition in either of said fill electrical means or said pump motor means the other is rendered inoperative.
(a) fill means including valve means adapted for connection to a source of pressurized water, said fill means including electrical means operable upon energization for causing said valve means to admit water to said receptacle from said source and operable upon deenergization for causing said valve means to prevent water flow to said receptacle from said source; and, (b) pump means including motor means operable upon connection to a source of electrical power to circulate the water in said receptacle for washing the dishes, said pump means having the inlet thereof connected to receive the head of water in said receptacle, said pump motor means and said fill electrical means being connected electrically in series circuit such that in the event of an open circuit condition in either of said fill electrical means or said pump motor means the other is rendered inoperative.
6. The system defined in claim 5, wherein:
(a) said electrical means includes electromagnetic means having a first armature, said electromagnetic means being operative upon a normal level of electrical energization to move said armature from a deactuated position preventing water flow to an actuated position for causing said valve means to admit water to said receptacle;
(b) said electromagnetic means includes movable pole piece means operable upon movement from an unactuated to an actuated position to shunt the magnetomotive force of said electromagnetic means and cause said first armature to move to the deactuated position, thereby stopping water flow: and, (c) pressure responsive means operable, upon receipt of a predetermined fluid pressure signal from said pump discharge, to move said movable pole piece means from the unactuated to the actuated condition.
(a) said electrical means includes electromagnetic means having a first armature, said electromagnetic means being operative upon a normal level of electrical energization to move said armature from a deactuated position preventing water flow to an actuated position for causing said valve means to admit water to said receptacle;
(b) said electromagnetic means includes movable pole piece means operable upon movement from an unactuated to an actuated position to shunt the magnetomotive force of said electromagnetic means and cause said first armature to move to the deactuated position, thereby stopping water flow: and, (c) pressure responsive means operable, upon receipt of a predetermined fluid pressure signal from said pump discharge, to move said movable pole piece means from the unactuated to the actuated condition.
7. The system defined in claim 6, wherein said electromagnetic means includes auxiliary armature means operative upon said electromagnetic means experiencing a substantially higher than normal level of electrical energization to move said pole piece means to said actuated position.
8. The system defined in claim 6 wherein:
(a) said electromagnetic means includes a coil with said first armature means disposed therein; and, (b) said second armature includes a member having portions thereof disposed circumferentially about the outer periphery of said coil.
(a) said electromagnetic means includes a coil with said first armature means disposed therein; and, (b) said second armature includes a member having portions thereof disposed circumferentially about the outer periphery of said coil.
9. The system defined in claim 6, wherein said second level of electrical energization is the stalled rotor current of said pump motor means.
10. A water fill control system for an automatic washer having a receptacle in which articles are placed for washing, said system comprising:
(a) fill means including electromagnetically actuated valve means having an armature movable from an unactuated position in which said valve means prevents flow of water to the receptacle to an actuated position in which said valve means admits water to said receptacle, said valve means having pole piece means operable upon movement from a first position in which the magnetomotive force of said electromagnetic means is operative to actuate said armature to a second position in which the magnetomotive force acting on said armature is shunted for disabling armature actuation;
(b) means biasing said armature to the unactuated position;
(c) means biasing said pole piece means to the first position:
(d) pump means including motor means operable upon connection to a source of electrical power to circulate the water in said receptacle for washing dishes with the pump means having the inlet thereof connected to receive the head of water in said receptacle, said pump motor means and said electromagnetic valve means being connected electrically in series circuit arrangement such that a common current flows through each; and, (e) power actuator means operative upon receipt of a command signal to move said pole piece means from said first to said second position.
(a) fill means including electromagnetically actuated valve means having an armature movable from an unactuated position in which said valve means prevents flow of water to the receptacle to an actuated position in which said valve means admits water to said receptacle, said valve means having pole piece means operable upon movement from a first position in which the magnetomotive force of said electromagnetic means is operative to actuate said armature to a second position in which the magnetomotive force acting on said armature is shunted for disabling armature actuation;
(b) means biasing said armature to the unactuated position;
(c) means biasing said pole piece means to the first position:
(d) pump means including motor means operable upon connection to a source of electrical power to circulate the water in said receptacle for washing dishes with the pump means having the inlet thereof connected to receive the head of water in said receptacle, said pump motor means and said electromagnetic valve means being connected electrically in series circuit arrangement such that a common current flows through each; and, (e) power actuator means operative upon receipt of a command signal to move said pole piece means from said first to said second position.
11. The fill control system defined in claim 10, wherein:
(a) said power actuator means comprises pressure responsive means operative to move said pole piece means from said first to said second position, (b) said command signal comprises a fluid pressure signal from said pump means; and, (c) said pump means includes conduit means connecting the discharge side of said pump to said power actuator means.
(a) said power actuator means comprises pressure responsive means operative to move said pole piece means from said first to said second position, (b) said command signal comprises a fluid pressure signal from said pump means; and, (c) said pump means includes conduit means connecting the discharge side of said pump to said power actuator means.
12. The fill control system defined in claim 10 wherein:
(a) said power actuated means comprises auxiliary armature means operatively connected to said electromagnetically actuated valve means and movable between a normal position and a wash pressure position and operable by such movement to move said pole piece means to said second position; and, (b) means biasing said auxiliary armature means to said normal position with a force sufficient to delay movement therefrom to said wash pressure position until said electromagnetic valve means receives said command signal whereupon the magnetomotive force generated overcomes said auxiliary bias means and said auxiliary armature means is moved to said wash pressure position thereby causing said valve means to prevent water flow to said receptacle.
(a) said power actuated means comprises auxiliary armature means operatively connected to said electromagnetically actuated valve means and movable between a normal position and a wash pressure position and operable by such movement to move said pole piece means to said second position; and, (b) means biasing said auxiliary armature means to said normal position with a force sufficient to delay movement therefrom to said wash pressure position until said electromagnetic valve means receives said command signal whereupon the magnetomotive force generated overcomes said auxiliary bias means and said auxiliary armature means is moved to said wash pressure position thereby causing said valve means to prevent water flow to said receptacle.
13. The control system defined in claim 12, wherein said electromagnetic valve means includes a solenoid coil with said armature disposed therewithin; and, said auxiliary armature means includes a member having portions thereof disposed about the outer periphery of said coil.
14. The fill control system defined in claim 10, wherein said power actuator means includes a pressure responsive diaphragm operative upon sensing a predetermined level of pump discharge pressure to move said pole piece means to said second shunting position.
15. The fill control system defined in claim 10 wherein said power actuator means includes:
(a) auxiliary armature means associated with said valve means and operative to move said pole piece means to said second shunting position in response to said valve means experiencing stalled rotor current in said pump motor means; and, (b) pressure responsive means connected to said pump means and operative upon sensing a predetermined discharge pressure of said pump means to move said pole piece means to said second shunt position.
(a) auxiliary armature means associated with said valve means and operative to move said pole piece means to said second shunting position in response to said valve means experiencing stalled rotor current in said pump motor means; and, (b) pressure responsive means connected to said pump means and operative upon sensing a predetermined discharge pressure of said pump means to move said pole piece means to said second shunt position.
16. The fill control system defined in claim 10, wherein said command signal comprises the locked-rotor current for said pump motor means.
17. A water fill control system for an automatic washer having a tub in which articles are placed for washing, said system comprising:
(a) fill means including electromagnetically actuated valve means for connection to a source of pressurized water, said valve means operable upon electrical energization for magnetically effecting movement of an armature for admitting water to said tub from said source and upon deenergization to stop water flow from said source to said tub, said valve means including a moveable magnetic pole piece and force actuator means operable upon receipt of a fluid pressure signal to apply said pressure to move said pole piece for defeating magnetomotive force to cause said valve means to stop flow of water when said valve means is in the electrically energized condition;
(b) programmer means including switch means operable to connect said valve electrical means to said source of power in accordance with a preselected program; and, (c) means sensing the pressure head of water in the tub and operable to provide said fluid pressure signal upon said water head rising above a desired level.
(a) fill means including electromagnetically actuated valve means for connection to a source of pressurized water, said valve means operable upon electrical energization for magnetically effecting movement of an armature for admitting water to said tub from said source and upon deenergization to stop water flow from said source to said tub, said valve means including a moveable magnetic pole piece and force actuator means operable upon receipt of a fluid pressure signal to apply said pressure to move said pole piece for defeating magnetomotive force to cause said valve means to stop flow of water when said valve means is in the electrically energized condition;
(b) programmer means including switch means operable to connect said valve electrical means to said source of power in accordance with a preselected program; and, (c) means sensing the pressure head of water in the tub and operable to provide said fluid pressure signal upon said water head rising above a desired level.
18. A water fill control system for an automatic washer having a receptacle in which articles are placed for washing, said system comprising:
(a) fill means including valve means adapted for connection to a source of pressurized water, said fill means including electrical means operable upon energization for causing said valve means to admit water to said receptacle from said source and operable upon deenergization for causing said valve means to prevent water flow to said receptacle from said source; and, (b) pump means including motor means operable upon connection to a source of electrical power to circulate the water in said receptacle for washing the articles, said pump means having the inlet thereof connected to receive the head of water in said receptacle, said pump motor means and said fill electrical means being connected electrically in series circuit such that in the event of an open circuit condition in either of said fill electrical means or said pump motor means the other is rendered inoperative.
(a) fill means including valve means adapted for connection to a source of pressurized water, said fill means including electrical means operable upon energization for causing said valve means to admit water to said receptacle from said source and operable upon deenergization for causing said valve means to prevent water flow to said receptacle from said source; and, (b) pump means including motor means operable upon connection to a source of electrical power to circulate the water in said receptacle for washing the articles, said pump means having the inlet thereof connected to receive the head of water in said receptacle, said pump motor means and said fill electrical means being connected electrically in series circuit such that in the event of an open circuit condition in either of said fill electrical means or said pump motor means the other is rendered inoperative.
19. A water fill control system for an automatic washer having a receptacle in which dishes are placed for washing, said system comprising:
(a) fill means including adapted for connection to a source of water, said fill valve means including electro-magnetic means operable upon energization for causing said valve means to admit water to said receptacle from said source and operable upon deenergization for causing said valve means to prevent water flow to said receptacle from said source;
(b) pressure responsive actuator means operable, upon receipt of a fluid pressure command signal, to effecting closing of said valve means while said electromagnetic means is energized;
(c) means operable to sense the water head in said receptacle and operable to provide said command signal upon said head rising above a preselected level;
(d) electric pump means for recirculating water in receptacle said pump means electrically series connected with said fill valve means electromagnetic means; and, (e) electromagnetic means including first and second armature means said first armature means operable upon electrically energization to open said valve means and said second armature means operative armature means moveable in response to excessive current in said pump means for effecting closing of said valve means while said electromagnetic means is energized.
20. A water fill control system for an automatic washer having a tub in which articles are placed for washing, said system comprising:
(a) fill means including electromagnetically actuated valve means for connection to a source of pressurized water, said valve means including a solenoid operator having an armature moveable, upon energization, to cause said valve to admit water to the tub and, upon deenergization, to prevent water flow to the tub, said electromagnetic valve means having a magnetic pole piece moveable between a first position creating magnetomotive forces upon solenoid energization for effecting said solenoid armature movement to admit water and a second position for defeating said magnetomotive forces on said armature, despite solenoid energization;
(a) fill means including adapted for connection to a source of water, said fill valve means including electro-magnetic means operable upon energization for causing said valve means to admit water to said receptacle from said source and operable upon deenergization for causing said valve means to prevent water flow to said receptacle from said source;
(b) pressure responsive actuator means operable, upon receipt of a fluid pressure command signal, to effecting closing of said valve means while said electromagnetic means is energized;
(c) means operable to sense the water head in said receptacle and operable to provide said command signal upon said head rising above a preselected level;
(d) electric pump means for recirculating water in receptacle said pump means electrically series connected with said fill valve means electromagnetic means; and, (e) electromagnetic means including first and second armature means said first armature means operable upon electrically energization to open said valve means and said second armature means operative armature means moveable in response to excessive current in said pump means for effecting closing of said valve means while said electromagnetic means is energized.
20. A water fill control system for an automatic washer having a tub in which articles are placed for washing, said system comprising:
(a) fill means including electromagnetically actuated valve means for connection to a source of pressurized water, said valve means including a solenoid operator having an armature moveable, upon energization, to cause said valve to admit water to the tub and, upon deenergization, to prevent water flow to the tub, said electromagnetic valve means having a magnetic pole piece moveable between a first position creating magnetomotive forces upon solenoid energization for effecting said solenoid armature movement to admit water and a second position for defeating said magnetomotive forces on said armature, despite solenoid energization;
Claim 20 cont'd.
(b) pump means operable upon electrical energization to circulate the water in said tub for washing the articles, with the inlet of said pump connected to receive the head of water in said tub, said pump means and said electromag-netically actuated valve means electrically series connected such that an open circuit condition in one renders the other inoperative;
(c) pressure responsive diaphragm means connected for sensing the discharge pressure of said pump, said diaphragm means operative to move said pole piece from said first to said second position upon sensing pump discharge pressure in excess of a predetermined pressure for effecting closing of said valve means to stop tub water fill.
(b) pump means operable upon electrical energization to circulate the water in said tub for washing the articles, with the inlet of said pump connected to receive the head of water in said tub, said pump means and said electromag-netically actuated valve means electrically series connected such that an open circuit condition in one renders the other inoperative;
(c) pressure responsive diaphragm means connected for sensing the discharge pressure of said pump, said diaphragm means operative to move said pole piece from said first to said second position upon sensing pump discharge pressure in excess of a predetermined pressure for effecting closing of said valve means to stop tub water fill.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US35998082A | 1982-03-19 | 1982-03-19 | |
| US359,980 | 1982-03-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1207409A true CA1207409A (en) | 1986-07-08 |
Family
ID=23416100
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000423182A Expired CA1207409A (en) | 1982-03-19 | 1983-03-09 | Dishwasher water fill control system |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1207409A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5409023A (en) * | 1992-10-20 | 1995-04-25 | Santarossa; Gianni | Dishwashing machine with water fill control |
| US5722263A (en) * | 1995-01-12 | 1998-03-03 | Electrolux Zanussi Elettrodomestici | Washing machine with dynamic water inlet control arrangement |
-
1983
- 1983-03-09 CA CA000423182A patent/CA1207409A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5409023A (en) * | 1992-10-20 | 1995-04-25 | Santarossa; Gianni | Dishwashing machine with water fill control |
| US5722263A (en) * | 1995-01-12 | 1998-03-03 | Electrolux Zanussi Elettrodomestici | Washing machine with dynamic water inlet control arrangement |
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