US3574330A - Sensor control - Google Patents

Sensor control Download PDF

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Publication number
US3574330A
US3574330A US3574330DA US3574330A US 3574330 A US3574330 A US 3574330A US 3574330D A US3574330D A US 3574330DA US 3574330 A US3574330 A US 3574330A
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segment
gear
sensing
trigger
tank
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David G Prosser
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Autotrol Corp
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Autotrol Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J49/00—Regeneration or reactivation of ion-exchangers; Apparatus therefor
    • B01J49/80—Automatic regeneration
    • B01J49/85—Controlling or regulating devices therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/86389—Programmer or timer

Definitions

  • ABSTRACT A water softener sensor control transmits the output of a motor in response to hardness of periodic water [54] SENSOR CONTROL 2 Claims, 5 Drawing Figs.
  • a water softener consists of a tank containing a bed of ion exchange resins through which the water to be treated flows, and the resin serves to combine with those ions in the water that made the water hard.
  • the capacity of the ion exchanger tocombine with ions becomes exhausted, the exhaustion beginning at the end of the bed where the hard water enters and gradually traveling the length of the bed toward the end where the soft water leaves.
  • the hard water enters at the top of the tank and the soft water flows out of the bottom.
  • timing devices such as that shown in U.S. Pat. No. 3,302,467, which issued on Feb. 2, 1967, were commonly used. That timing control operates to regenerate the ion exchanger at preset periodic intervals regardless of the condition of the ion exchanger.
  • the installer must estimate the gallons of softened water that would probably be demanded by the customer, appraise the average hardness of the water, and then he sets the timing mechanism to regenerate the ion exchanger at intervals long before the entire bed of ion exchanger becomes exhausted in an effort to ensure that the customer is never without softened water.
  • This system while effective, has a number of disadvantages.
  • the present invention relates to a method of sensing ion concentration in a liquid utilizing volume responsive ion exchanger that swells or shrinks in volume when washed by the liquid responsive to the ion concentration in that liquid. More specifically the invention resides in a process according to which a measured quantity of volume responsive ion exchanger is placed in a sensing chamber, a sample of liquid is admitted into said sensing chamber with said volume responsive ion exchanger, a plunger in said chamber is moved into engagement with said volume responsive ion exchanger to measure its volume; said plunger is withdrawn out of contact with said volume responsive ion exchanger, and said volume responsive ion exchanger is regenerated by washing it with a regenerating reagent.
  • the foregoing process ensures that the volume responsive ion exchanger will be unimpeded in its growth during that portion of the cycle when it swells. This has been found to be critical to the successful practical utilization of those ion exchangers in a sensor for sensing the ion content of a liquid. As a result of this process, the ion exchanger reliably senses the condition of the sampled liquid with calculable accuracy.
  • the invention also resides in a sample sensing chamber that can serve as a receptacle for a volume responsive ion exchanger that has a reciprocable plunger seated inside of its top with an extension projecting out of the sample sensing chamber for controlling and sensing the movement of the plunger; a liquid sample inlet which contains a valve and which is adapted to emit the liquid into the chamber laterally at a plurality of vertically spaced locations, and a liquid outlet which is adapted to receive liquid in said sample sensing chamber at a plurality of vertically spaced locations.
  • the apparatus recited in the immediately preceding paragraph provides means for carrying out the process described above to achieve the mentioned objectives.
  • this apparatus provides for a horizontal flow of liquid through the ion exchanger to ensure a thorough immersion of the ion exchanger in the liquid and to agitate the ion exchanger so that it does not become compacted.
  • a sampling and sensing device that includes a sample sensing chamber, an intake valve in the sample sensing chamber that has an extension projecting out of the sample sensing chamber with a follower on it riding on a cam surface of a cam member, a reciprocable plunger that is mounted in one end of the sample sensing chamber and biased inwardly of the chamber and that has an extension projecting out of the chamber with a cam follower on it riding on another cam surface of the cam member, the cam surfaces of the cam member being so shaped that the plunger is normally held in its outward position and the intake valve is opened before the plunger is dropped into the sample sensing chamber, means for periodically moving the cam member and means for sensing the travel of said plunger.
  • the combination of the immediately preceding paragraph provides a mechanical means for detecting the volume change of a ion exchanger and translating that volume changer into a mechanical force to control another mechanism.
  • a mechanical means for detecting the volume change of a ion exchanger and translating that volume changer into a mechanical force to control another mechanism makes it possible to perform the sensing only at preset times of the day so that a water softener using this device will be removed from service for regeneration only at those times when there is the least likelihood of a demand for softened water.
  • the plunger is also held away from the ion exchanger at all times, except when sensing its volume, so that the ion exchanger will not coalesce or fracture and will not be inhibited from repeatedly seeking that volume that precisely reflects the condition of the water sample.
  • the invention also resides in a mechanism for intermittantly transmitting a rotary force responsive to a relatively small mechanical signal
  • the components of this mechanism include a rotatable force transmitting gear segment that has a gap between its ends and that is in driving engagement with a rotating pinion, a trigger gear segment that has substantially the same pitch diameter and tooth configuration as the force transmitting gear segment and that is mounted coaxially with the force transmitting gear segment both to rotate with the force transmitting gear segment and to rotate a limited distance relative to the force transmitting gear segment into and away from said gap and a trigger member on the trigger gear segment that can be engaged to rotate the trigger gear segment relative to the force transmitting gear segment.
  • the combination described in the immediately preceding paragraph functions as a highly effective and efficient mechanical amplifier.
  • a relatively slight mechanical force exerted on the trigger member can initiate the transmission of an indefinitely powerful rotational force on the pinion driving the force transmitting gear segment.
  • the operation of this mechanical amplifier is such that once it has been triggered it will transmit power until the end of its cycle and cannot be controlled through its trigger element until the full cycle has been completed. 7
  • the invention also resides in a reciprocator including a drive gear that has a tubular hub with an arcuate rack on an end spaced axially from the drive gear and that is driven through a gear train by a power source, a return gear that is mounted concentrically'with said drive. gear and has a hub with a pinion on its end projecting through said tubular hub of said drive gear and that is driven by said power source through a second gear train to rotate in an opposite direction from said drive gear, and a reciprocating rack mounted to be alternately drivingly engaged by said arcuate rack on said drive gear hub and said pinion on said return gear hub.
  • the reciprocator described above can impart maximum force to the reciprocating rack in the drive direction and a high speed return to the reciprocating rack at the end of the drive stroke. It is a highly flexible reciprocator mechanism that can utilize the power source with maximum efiiciency to produce a controlled reciprocating motion in an indefinite range of speed and power characteristics.
  • the invention also resides in a readily adjustable sample intake including an intake tube, a sealing assembly in a tank wall through which the intake tube passes, the sealing assembly including inner and outer telescoping members, the inner member which is made of a resilient deformable material has an axial channel through which the intake tube normally slidably fits and is screw threaded inside the outer member, and the outer member has a restricted inner diameter which slidably engages the inner member so that as the inner member is screwed into outer member the restricted inner diameter of the outer member slides along and coacts with an outer surface of the inner member to constrict the inner member tightly about the intake tube.
  • the level at which the water sample is taken in a water softener can be readily adjusted.
  • the level at which the sample is taken is important to the satisfactory automatic operation of water softener.
  • the use of the recited clamping sealing mechanism on the intake tube makes it possible for an installer or a service man to adjust the level of intake by simply loosening the inner member with a wrench and pulling the tubing out to raise the sampling level or feeding the tubing in to lower the sampling level and then tightening the inner member so that it clamps the tube in position.
  • FIG. 1 is a plan view of a sensor control embodying the present invention with portions broken away to reveal internal functioning structures
  • FIG. 2 is an exploded front view in perspective of an output gear assembly from the sensor control shown in FIG. 1:
  • FIG. 3 is an exploded back view in perspective of the output gear assembly shown in FIGS. 1 and 2;
  • FIG. 4 is an exploded diagrammatic view of the gear trains and assemblies in the sensor control shown in FIG. 1;
  • FIG. 5 is an exploded view of the rotary control assembly employed in the sensor control shown in FIG. I.
  • the mechanism of the sensor control is enclosed in a rectangular housing I, the cover (not shown) of which is removed to reveal the mechanism.
  • the rectangular housing 1 would be mounted on top of a water softener tank on the end of a valve control assembly such as is shown in my copending application, Ser. No. 739,539, filed Jun. 24, 1968, and entitled Softener Control Assembly," it being the function of this mechanism to transmit driving force to the mechanism shown in that application for operating valves that control the flow of this water to be treated and of the regeneration fluid.
  • Mounted to the bottom of the housing I by means of screws (not shown) is a sample sensing chamber 2, which is shown in section to reveal its interior, and which contains an ion sensitive resin 2a which shrinks when wetted with hard water.
  • the sample sensing chamber 2 is a hollow, rectangular shaped object made of a section of plastic rectangular tubing forming the vertical sidewalls and molded plastic top and bottom members 2! and 23, respectively, which are assembled together by the mounting screws (not shown) that extend vertically through the corners of those three pieces and into the housing 1.
  • a flexible sampling tube 3 is suspended by a threaded sleeve 4 on a tubular fitting 4a that protrudes from the bottom of the sample sensing chamber 2, and the sampling tube 3 passes through an adjustable gripping seal 5 that is screw mounted in an upper wall 6 of a water softener tank.
  • a weighted intake noule I0 is fastened on the end of the sampling tube 3 that is suspended in a bed of softener ion exchanger inside the softener tank.
  • An exhaust tubing 7 is fastened by a threaded sleeve 8 to a tubular fitting 8a that protrudes from the bottom of the sample sensing chamber 2 on the opposite side from the sampling tube 3.
  • a valve assembly 11 normally closes the mouth of the sampling tube 3 and has a valve stem 12 that extends upward out of the sample sensing chamber 2.
  • a vertical tube 13 which is vented with a plurality of vertically spaced transverse slots or openings houses a needle 14 on the end of the valve stem 12,
  • a pair of O-ring seals 15 and 16 are fixed in annular seats at opposite ends of the tube 13.
  • the valve stem I2 is sealed through the upper O-ring l6, and the needle I4 is inserted snugly through the lower O-ring to close the valve assembly 11.
  • the valve stem 12 is lifted, withdrawing the needle I4 from the lower O-ring 16.
  • a vertical drain tube 24 that is vented with a plurality of transverse slots or openings extends from the inner mouth of the tubular fitting 8a which opens outwardly into the exhaust tubing 7, to the ceiling of the interior of the chamber 2.
  • fluids introduced to the chamber 2 through the valve assembly 11 will tend to flow horizontally across the chamber 2 into the vertical drain tube 24 and then down into and out through the exhaust tubing 7.
  • a flexible diaphragm 17 extends across and seals the top of the interior of the sampling sensor chamber 2.
  • the diaphragm I7 is a soft, rubber membrance that is sealed about its peripheral edges between the tops of the lateral walls and top piece 21 of the sample sensing chamber 2 and it passes beneath a mechanical sensor in the form of a plunger 18, to which it is screw fastened.
  • a compression spring 19 urges the plunger 18 downwardly.
  • One end of the compression spring 19 bears against a spring seat 20 in the plunger 18, and the other end of which bears against the top 21 of the sample sensing chamber 2.
  • a plug 22 is screw fitted in an opening through the floor piece 23 of the sample sensing chamber 2 so that the sample sensing chamber 2 may be opened without dismantling it.
  • An electric drive motor 25 is mounted on the outside surface (not shown) on a backwall 26 of the rectangular housing 1 to provide a power source for the entire mechanism of the sensor control, and its drive shaft 27 projects through a bearing (not shown) in the backwall 26 of the rectangular housing 1.
  • the drive shaft 27 has a main drive pinion 28 mounted on it adjacent the inside surface of the backwall 26, and the shaft 27, and pinion 28 are continuously driven by the motor 25.
  • the electric motor is also the prime mover for the Softcner Control Assembly" of the mentioned copending application of that tile, that controls the valves of the softener, or of any other mechanism that is to be driven through the sensor control.
  • the motor 25 is continuously operating, low speed motor 25 and the mechanism to be disclosed determines when the motive force of the motor 25 is to be transmitted to the Softener Control Assembly or other mechanism to be driven by it, and it serves as a transmission for that motive force.
  • the main drive pinion 28 simultaneously drives four gear trains 29, 30, 31 and 32, which share some common elements, though each train 29-32, performs a specific end function distinct from the others.
  • the sampling gear train 29 has a spur gear 33 engaged with the main drive pinion 2 8 with a reduction pinion 34 formed on its hub.
  • the reduction pinion 34 drives a second spur gear 35 that has a reduction pinion 36 on its hub, which simultaneously drives two spur gears 37 and 38, the latter gear 38 operating only in the sampling return gear train 30.
  • the spur gear 37 that is driven by the reduction pinion 36 has a reduction pinion 39 on its hub, and this reduction pinion 39 engages a drive gear segment 40 that forms a part of a rotary control assembly 41, which is illustrated in an exploded view in FIG. 5.
  • the sampling return gear train shares the spur gears 33 and and their respective reduction pinions 34 and 36 with the sample gear train 29, and has in addition the mentioned spur gear 38 with an extended hub 42 that has a pinion 43 formed on top of it.
  • the extended hub 42 of the return spur gear 38 passes though the hollow center of an annular hub 44 that is formed on the drive gear segment 40.
  • the sampling return spur gear 38 is rotatably mounted on the backwall 26 of the rectangular housing 1 and it rotatably supports the drive gear segment on an annular collar 45 that is formed on the upper surface of the spur gear 38.
  • the rotary control assembly 41 is, among other things, a unique form of rotary mechanical amplifier. in addition to the drive segment 40, referred to above, the rotary control assembly 41 also includes a trigger gear segment 46 that has for a hub an annular ring 47, which fits rotatably about the hub 44 of the drive gear segment 40.
  • the drive segment 40 is a circular gear segment 40, the ends of which are separated by a short gap 48, and the trigger segment 46 is a shorter circular segment 46 that has the same pitch diameter and tooth configuration as the drive gear segment 40.
  • a circular bias spring 49 fits around the annular ring 47 of the trigger segment 46 and has one end hooked about a hook 50 projecting from the drive segment 40 and its other end hooked on a hook 500 projecting -from a trigger segment 46.
  • a pair of limit arms 51 project radially from the hub 44 of the drive segment 40 through slots 113 in the tubular hub-47 of the trigger segment 46 to limit the rotational movement of the trigger segment 46 with respect to the drive segment 40, and the arms, incidentally, also restrain the bias spring 49 axially to hold it in place.
  • This assembly utilizes the functional elements mutually to restrain each other so that no additional screws, rivets or other assembly members are needed.
  • the tension of the bias spring 49 is such and the hook 50 on the drive segment 40 and hook 50a on the trigger segment 46 are so located that the trigger segment 46 is normally biased to a position immediately adjacent the gap 48 between the ends of the drive segment 40.
  • the trigger segment 46 has a vertical trigger member 52 projecting from one end of it and a radial trigger member 53 extending outwardly from it almost diametrically opposite the vertical trigger 52.
  • the slots 113 define the amount of movement of the trigger segment 46 relative to the drive segment 40, and when one of the triggers 52 or 53 moves the trigger segment 46, it moves the trigger segment 46 to the limit of its relative to the drive segment 40, one at each end of its relative motion.
  • the trigger segment 46 has two positions relative to the drive segment 40, one at each end of its relative motion, and in each it is in alignment with the drive segment 40.
  • a relief slot 116 is cut in the trigger gear segment 46 to allow the trigger segment 46 to flex. Since the trigger segment is made of a resilient plastic, it can thus be formed to flex under strain. Hence, if the trigger segment 46 is not in perfect alignment with the drive gear segment 40, preventing the drive pinion 39 from meshing immediately with it, the gear teeth will not be damaged. The permits much larger tolerances in the manufacturing specifications with resulting reductions in costs.
  • a semicircular collar 54 extends axially from the top end of the hub 44 on the drive segment 40 and on one end of the collar 54 an arcuate gear rack 55 is formed.
  • a linearly reciprocably slidable cam member 56 is located adjacent to the collar 54 and it has a linear gear rack 57 on its upper surface that can be engaged by the arcuate gear rack 55 on the collar 54 as the collar 54 rotates with the drive segment 40.
  • this mechanism is used primarily to effect a controlled return of the cam member 56, in lieu of utilizing a spring return or some other such additional force.
  • the mechanism can provide, for example, tremendous mechanical force advantage in one direction with a very high speed, light force return. This would allow maximum utilization of energy during a working stroke with minimum loss on the return.
  • the output gear train 31 shares with the timing gear train 32 a spur gear 60, which is driven by the main drive pinion 28.
  • the spur gear 60 has a reduction pinion 61 on its hub, and the reduction pinion 61 drives a second spur gear 62 which has a reduction pinion 63 on its hub.
  • a circular output gear segment 64 is rotatably mounted in the housing 1, and it is engaged by the reduction pinion 63.
  • the output segment 64 is part of a rotary output assembly 65 that is illustrated in exploded view in FIGS. 2 and 3.
  • the output gear segment 64 has an extended, hollow tubular hub 66 projecting axially out of the rectangular housing 1 with an indicator arrow 67 formed across its top surface and knurled grip portion 68 about its top end.
  • the hollow hub 66 fits rotatably about a portion of a cylindrical journal bearing 69 that is anchored to the backwall 26 of the housing 1 and that projects from the backwall 26 into the housing 1.
  • the journal bearing 69 rotatably mounts an output shaft 105.
  • compression spring 70 is seated in a spring seat 106 in the drive shaft 105 and bears upwardly against the inside of the hub 66, which is restrained in its axial movement by the inside of a front wall (not shown) of the rectangular housing 1.
  • compression spring70 tends to hold the output segment 64 into engagement with the reduction pinion 63 formed on the hub of the spur gear 62, so that the hub 66 of the output segment 64 may be manually depressed to release the output segment 64 which then may be manually rotatably adjusted free of engagement with the spur gear 62.
  • Rectangular keys 106 and 107 extend radially from opposite sides of the output shaft 105 to slide in grooves 108 and 109 formed on the inside of the hub 66.
  • the rotational movement of the output gear segment 64 is transmitted to the output shaft 105, which conveys that movement through the journal bearing 69 outside of the housing 1 to the mechanism (not shown), such as that disclosed in the copending application, Ser. No. 739,539, filed Jun. 24, 1968, and entitled Softener Control Assembly.”
  • the rotary output assembly 65 embodies the same type of unique rotary mechanical amplifier as the rotary control assembly 41. Hence, what has been said of the operation and capabilities of the control assembly 41 applies as well to the corresponding structure in the output assembly 65.
  • the output segment 64 is a circular gear segment 64 with a small gap 71 between its ends.
  • a trigger gear segment 72 which also is circle segment 72 and which has the same pitch diameter and gear configuration as the output segment 64, has an annular ring 73 for a hub that forms a rotating fit about the hub 66 on the output segment 64.
  • a circular bias spring 74 fits about the annular ring 73, and one of its ends engages a hook 75 on the trigger segment 72 and the other end is anchored to a hook 750 on the output segment 64.
  • the bias spring 74 is restrained beneath a pair of limit arms 76 that radiate from the hub 66 of the output segment 64 through slots 77 in the annular ring 73 above the trigger segment 72, and the limit arms 76 serve to limit the amount of relative rotational movement of the trigger segment 72 with respect to the output segment 64.
  • a vertical trigger 78 projects from the trigger segment 72 so that is may be engaged by some external device to rotate the trigger segment 72 relative to the output segment 64 against the bias spring 74.
  • the trigger segment 72 is held adjacent to the gap 71 between the ends of the output segment 64, but when the trigger segment 72 is actuated by engaging the vertical trigger 78, the trigger segment 72 rotates into a position above the gap 71 so that the reduction pinion 63 can mesh with the trigger segment 72 and, through the trigger segment 72, drive the output segment 64 until it meshes directly with the output gear segment 64.
  • the pinion 63 is enmeshed with the output segment 64 the trigger segment 72 is released to return to its normal position.
  • the trigger segment 72 is provided with a relief slot 115 that corresponds in structure and function to the relief slot 116 in the trigger gear segment 46 of the control assembly 41.
  • the sensing plunger 18 in the sample sensing chamber 2 shown in FIG. 1 has a rod 79 extending from it and projecting out of the sample sensing chamber 2 upwardly into the housing 1.
  • An arm 80 extends from the end of the rod 79 and has a latch 81 on its upper end that is positioned adjacent to the tubular ring 73 above the output trigger gear segment 72.
  • the latch 81 will reciprocate with the plunger 18 to move into and out of the path of the vertical trigger 78 on the trigger gear segment 72.
  • a cam follower 82 projects outwardly from the arm 80 on the rod 79 of the plunger 18 to ride on a cam surface 83 over the top of the cam member 56.
  • the left end of the cam surface 83 is relatively low but it rises sharply to the right before leveling off, so that as the cam member 56 is driven to the left the plunger 18 is hoisted to the top of its stroke in the sample sensing chamber 2 and the latch 81 is positioned above the vertical trigger 78 on the trigger gear segment 72.
  • the cam surface 83 releases the cam follower 82 and the plunger 18, which is then driven downward by the compression spring 19. lf the movement of the plunger 18 in the chamber 2 is not obstructed, the latch 81 will engage the vertical trigger 78 and pull the trigger gear segment 72 against the bias spring 74 into the gap 71 between the ends of the output gear segment 64 to engage the reduction pinion 63.
  • the last gear train to be described is the timing gear train 32.
  • the timing gear train-32 shares the spur gear 60 and reduction pinion 61 with the output gear train 31, and the reduction pinion 6] drives a first spur gear 84.
  • a reduction pinion 85 on the hub of the first spur gear 84 engages a second spur gear 86, which also has a reduction pinion 87.
  • the reduction pinion 87 on the second spur gear 86 engages a third spur gear 88 to drive a timing gear 89 through a reduction pinion 90 on the hub of the third spur gear 88.
  • the timing gear 89 makes one revolution each 24 hours, and it is mounted to be manually set to the time the mechanism is put into operation.
  • An annular collar 91 is mounted on the under side of the timing gear 89, and on one end of the annular collar 91 an extension 92 projects approximately radially outwardly toward the periphery of the timing gear 89.
  • This radial extension 92 of the annular collar 91 is shaped and positioned so that it can engage the vertical trigger 52 projecting from the trigger segment 46 in the control assembly 41 to drive the trigger segment 46 into the gap 48 between the ends of the drive segment 40.
  • the resulting rotation of the drive segment 40 drives the cam member 56, which controls the sensing and sampling of the water being treated in the softener tank 6.
  • the sampling valve assembly 11 has a rectangular extension portion 93 on the valve stem 12 that has a guide slot 94 in it, through which a guide post 110 projecting from the backwall 26 of the housing 1 extends to guide its reciprocating travel.
  • a cam follower 95 projects outwardly through a slotted cam surface 96 in the cam member 56.
  • the left two-thirds of the slot cam 96 is horizontal, but in the right one-third, the cam surface 96 rises sharply to a brief plateau at the right end, so that as the cam member 56 moves to the left, the valve stem 12 and needle 14 are raised rapidly during the last third of its travel to open the sampling valve assembly 11. This allows a sample of fluid from the sampling tube'3 to enter the ample sensing chamber 2 while the plunger 18 is lifted to its highest position.
  • the sample sensing chamber 2 is charged with a quantity of ion exchange resins 2a, such as those disclosed in US. Pat. No. 2,810,692.
  • ion exchange resins 2a such as those disclosed in US. Pat. No. 2,810,692.
  • sensing ion exchanger 2a To regenerate the charge of ion exchange resin 2a, which may be referred to as the sensing ion exchanger 2a after it has been exhausted by the hard water, it is washed with brine, which has the effect of further shrinking the volume of the sensing ion exchanger 20
  • the sensing ion exchanger 20 When the sensing ion exchanger 20 is washed with soft water after it has been regenerated, it swells radically to its maximum volume, which is here considered to be the normal volume of the sensing ion exchanger 2a.
  • ion exchangers that manifest radical volume changes, either swelling or shrinking when washed with liquids containing concentrations of ions. It has been discovered that if these volume responsive ion exchangers are to be used to sense ion concentrations, it is essential that these ion exchangers not be confined when subjected to the particular conditions under which they would grow or swell. If these ion exchangers are confined when they would grow, some manifest a fracturing of the granules and the granules in others tend to coalesce, so that in either case the usefulness of the ion exchanger may be destroyed.
  • the sensing ion exchanger be relieved of the pressure of the plunger 18 except during the brief period of sensing, and it is also significant that the flow of the liquid samples and the regenerating liquid is horizontal so as to agitate the sensing ion exchanger 2a and avoid any substantial vertical fluid pressure against the sensing ion exchanger 2a.
  • the sensor control of the present invention It is the function of the sensor control of the present invention to sample the water in the water softener periodically to determine whether the softener ion exchanger 120 requires regeneration.
  • Important to the practical operation of such a periodic sensing device is the level in the softener tank 6 from which the sample is taken.
  • the softener ion exchange resins 120 begin to exhaust at the top where the hard water enters, and the exhaustion progresses down toward the bottom. The water softener remains effectively operative until virtually the entire bed of softener resin 120 is exhausted.
  • the sampling ought to be taken'at such a level in the softener resin 120 bed that sufficient softener resin 120 remains below it to last until the next succeeding sampling in the event that exhaustion has proceeded to a point immediately above where the sample is taken, but has not gotten quite to the level of the sampling point. Since the level at which the sample should be taken depends upon the hardness of the water and the volume of water used, the sampling level may be expected to vary with each installation, and thus it is desirable to be able to set the sampling level at the time and place of installation after surveying the determining factors. It is important, therefore, that the sampling level be readily adjustable.
  • the seal has an outer member 97 which is a tubular plug 97 screw fitted in a threaded hole through the upper wall 6 of the softener tank.
  • the outer member 97 has a top half 98 of its hollow interior of the plug 97 that is cylindrically shaped with a threaded portion 99 at the opening and a bottom half 100 of the hollow interior of the plug 97, the interior diameter of which tapers to its smallest dimension at its bottom end.
  • the seal 5 also includes a tubular inner member 101 that is telescoped inside of the outer member 97.
  • the inner member 101 has an enlarged head portion 102 on top with a threaded portion 103 of reduced cross-sectional dimension beneath it.
  • a smooth cylindrical portion 104 is located below the threaded portion 103 to fit within the converging bottom half 100 of the interior of the outer member 97.
  • the inner and outer members 97 and 101 of the sealing plug are made of a commercially available acetal homopolymer and the sampling tube 3 is a purchased polyethylene tube.
  • the tapered inside diameter 100 of the outer member 97 is formed to slide against the cylindrical outer portion 104 of the inner member 101.
  • the two surfaces 100 and 104 cooperate on an inclined plane or wedge principle as the inner member 100 is turned into the outer member 97 so that the thinner inner member 101 is constricted.
  • the outer surface 104 of the inner member 101 could be tapered and the inner diameter 100 of the outer member 97 made uniform, and the same result could be'achieved.
  • both surfaces 100 and 104 could be tapered, though the-angles of the surfaces should differ to prevent excessive frictional engagement between them.
  • the weighted intake nozzle 10 on the end of the sampling tube 3 may be raised or lowered in the softener tank by turning the gripping plug 101 out of the sealing plug 97 so as to loosen the fit of the tapered portion 104 of the gripping plug 101 about the sampling tube 3.
  • the sampling tube 3 When the sampling tube 3 is thus loosened, it may be pulled or pushed through the hollow interior of the gripping plug 101, until the intake nozzle 10 reaches the desired height.
  • the gripping plug 101 is turned down snugly into the sealing plug 97 until the sampling tube 3 is gripped tightly in place.
  • the heavy nozzle 10 is actually buried in the softener ion exchanger 120 but the ion exchange resin 120 presents no obstacle to the lowering of the nozzle 10 because during regeneration of the resin 120 is cleaned by flowing water up through the bed from bottom to top and this agitates and loosens the bed sufficiently to allow the nozzle 10 to find its lowest level.
  • the last spur gear 60 shared by the timing train 32 and the output train 31 also drives an indicator gear 111 which is mounted near the top of the housing 1 so that it projects into an opening 112 in the top lateral wall of the housing.
  • the purpose of the indicator gear 111 is to tell an observer at a glance whether or not the sensor control mechanism is operating.
  • the drive motor 25 turns continuously, driving the main drive pinion 28 and the reduction gear trains 29, 30, 31 and 32 continuously also.
  • the sample sensing chamber 2 contains a measured charge of cation exchange sensing resin 2a of the sort disclosed in U.S. Pat. No. 2,810,692, and the needle 14 is sealed securely through the O-ring 15 of the sampling intake valve assembly 11. Hard water enters the softener tank 6 at the top and the soft water flows out of the bottom of the tank 6, and the tank 6 is thus filled with water under a normal water pressure of the system in which the softener is being used.
  • the timing gear train 32 As the drive motor 25 drives the four reduction gear trains 29, 30, 31 and 32, only one of the reduction gear trains, the timing gear train 32, is performing a function at all times and it is rotating the timing gear 89 at a rate that provides one complete revolution every 24 hours. Most of the time the poses of description, assume that the operation begins moments before 2:00 AM. The radial extension 92 of the collar 91 would be seen to approach engagement with the vertical trigger 52 on the trigger gear segment 46 of the rotary control assembly 41. As the timing gear 89 continues to move past 2:00 A.M., the radial extension 92 of the collar 91 engages the trigger 52 and drives the trigger gear segment 46 into the gap 48 between the ends of the drive segment 40 where it is engaged by the spinning pinion 39.
  • the trigger segment 46 pulls the drive segment 40 into engagement with the pinion 39, which then directly drives the drive segment 40 rotating it until the pinion 39 again reaches the gap 48.
  • the arcuate gear segment 55 on the collar 54 projecting from the top of the hub 44 of the drive segment 40, which was already engaged with the rack 57 on the top of the cam member 56, drives the cam member 56 to the left in the drawing, and then rotates past engagement with the linear cam rack 57 so that the cam rack 57 rests on the collar 54.
  • the cam follower 95 on the extension 93 of the valve stem 12 has followed the cam surface 96 to its highest point, lifting the valve stem 12 and the needle valve 14 to open the valve 11 to allow a sample of water from the softener tank 6 to flow up through the sampling tube 3 into the tube 13 in the sample sensing chamber 2.
  • the water sample is sprayed out of the tube 13 through its vertically spaced openings and it thoroughly washes and agitates the sensing ion exchanger 20 as it flows across the chamber 2 and enters the drain tube 24 through its many vertically spaced openings to flow out of the chamber 2.
  • the cation exchange resin 2a will manifest its normal maximum volume and the travel of the plunger 18 into the sensing chamber 2 will be obstructed and stopped. However, if the water sample is hard, the cation exchange resin will shrink allowing the plunger 18 to drop under the impetus of the compression spring 19 to the bottom of its stroke.
  • the drive segment 40 of the control assembly 41 has continued its rotation under the impetus of the pinion 39, until it brings the arcuate rack 55 back into engagement with the linear rack 57 on the cam member 56 and drives the cam member 56 to the left sufficiently to cause the cam follower 82 to ride upwardly on the output cam surface 83.
  • the movement of the follower 82 on the cam surface 83 lifts the plunger 18 from the top of the cation exchange resin 2a in the chamber 2.
  • This is a significant aspect of the invention because the plunger 18 thus releases the cation exchange resin 20 to allow the cation exchange resin to seek its natural volume determined by the ion concentrations of the liquids that have wetted it.
  • the drive segment 40 of the control assembly 41 completes one rotation with the pinion 39 once again turning freely in the gap 48 between the ends of the drive segment 40.
  • a vertical actuator 114 projecting upwardly from the output segment 64 strikes the horizontal trigger member 65 on the trigger segment 46 of the control assembly 41 the output segment 64 continues to rotate, the vertical actuator 114 drives the trigger segment 46 of the control assembly 41 into its actuated position across the gap 48 between the ends of the drive segment 40 to engage the rotating control drive pinion 39, which then begins to drive the drive segment 40 through a second rotation.
  • ion exchanger regenerating reagent in this instance brine, that is circulating through the softener tank 6 is also circulated through the sensing ion exchanger 2a in the sensing chamber 2.
  • the regenerating cycle is extended, it may happen that the sensing ion exchanger 2a is not washed by soft water before the next sensing cycle. In either case, the condition of the water sample in the next sensing cycle will determine the volume of the sensing ion exchanger 20 so that the softener ion exchanger 120 will be regenerated only if regeneration is necessary to ensure proper operation of the softener.
  • the mechanism follows the same cycle as the original sensing cycle described above.
  • the cam member 56 after opening the valve 11 returns to the opposite extreme of its reciprocating movement, so that it is to the far right in the drawing.
  • the drive segment 40 of the control mechanism 41 continues rotating until the arcuate rack 55 once again engages the linear cam rack 57 on the cam member 56 and drives the cam member 56 from the right hand extreme of its reciprocating movement back to its normal central position.
  • the gap 48 between the ends of the drive segment 40 again reaches the control drive pinion 39 to halt the rotation of the drive segment 40, thus ending the entire operating cycle and holding the control mechanism 41 in its normal position until the timing gear 89 initiates the next sampling.
  • the regeneration cycle consumes about 2 A hours.
  • control segment 40 and the output segment 64 become power transmitting gear segments 40 and 64 and the respective trigger segments 46 and 72 are responsive to mechanical input signals to initiate transmission of power by the power transmitting segments 40 and 64.
  • the input signal is a timing pulse periodically emitted by the timing gear 89 and the output segment 64.
  • the output assembly 65 the input signal is an error feedback signal from the plunger 18 indicating that the treated water at a preset level in the softener bed does not manifest the desired condition.
  • Both input signals are or may be relatively weak and the output power transmitting to the output means, i.e. the output shaft and the cam member 56, by the power transmitting segments is, or may be, very great.
  • the cam member 56 with the sensing cam surface 83 and the sampling cam surface 96 serves as a means for sequentially, first, introducing a water sample into the chamber 2, and, second, sensing the response of the sensing ion exchanger 2a to detect the hardness of the water.
  • the cam member 56 also normally holds the plunger 18 out of engagement with the sensing resin 2a so that the sensing ion exchanger 2a can seek its proper volume and will not be damaged.
  • the sealing plug may be seen as inner and outer members 101 and 97, respectively, that are assembled in telescoping relationship with a screw thread connection between them as a seal and as means for relatively moving them axially so that the inclined planes of the tapered surfaces 101 and 104 coact to grip or release the tube 3.
  • An automatic sensing and regeneration control for a fluid treatment means comprising the combination of:
  • a fluid treatment tank for receiving a fluid to be treated
  • regeneratable ion exchanger in said fluid treatment tank to contact said fluid to change a condition of said fluid
  • a sensing means communicating with said interior of said tank, including a sensing chamber containing a volume responsive material with means to detect changes in the volume of said material to periodically sense said condition of said fluid at a predetermined location in said tank and to register said condition;
  • an adjustable timing mechanism coupled to said sensing means to automatically control said sensing means to periodically sense said condition of said fluid at desired times
  • an output means coupled to said sensing means to trigger an output for regenerating said ion exchanger in said fluid treatment tank when said sensing means register a predetermined state of said condition of said fluid.
  • An automatic sensing and regeneration control for a fluid treatment means as set forth in claim 1 wherein part of said sensing means is mounted externally of said fluid treatment tank and said sensing means includes a tube communicating through a wall of said tank between said part and said interior of said tank, said tube being adjustable externally of said tank to vary the location within the interior of said tank where said fluid condition is to be sensed.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treatment Of Water By Ion Exchange (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
US3574330D 1969-04-23 1969-04-23 Sensor control Expired - Lifetime US3574330A (en)

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US81876369A 1969-04-23 1969-04-23

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US (1) US3574330A (de)
BE (1) BE749265A (de)
CA (1) CA924534A (de)
DE (1) DE2017303C2 (de)
FR (1) FR2039398A1 (de)
GB (1) GB1321083A (de)
IT (1) IT987504B (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3676336A (en) * 1971-01-11 1972-07-11 Ecodyne Corp Method and apparatus for water softening
US3768649A (en) * 1971-07-15 1973-10-30 Fleckenstein A J Regeneration sensing system
US3831754A (en) * 1971-08-16 1974-08-27 Morton Norwich Products Inc Fluid treating apparatus
US4385992A (en) * 1981-06-29 1983-05-31 Autotrol Corporation Water softener control
US4668386A (en) * 1985-08-26 1987-05-26 Autotrol Corporation Water quality monitor
US4737275A (en) * 1986-03-06 1988-04-12 Autotrol Corporation Resin pressure sensor for water treatment
US20020017495A1 (en) * 2000-07-21 2002-02-14 Hiroshi Iizuka Water softening device
US20060086648A1 (en) * 2004-10-27 2006-04-27 General Electric Company Conductivity sensor for an ion exchange water softener

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4162997A (en) * 1978-03-02 1979-07-31 Hercules Incorporated Heat-fusible pastes for printing inks, adhesives and moldings
DE2953143C2 (de) * 1979-03-20 1984-06-20 Karl 7031 Aidlingen Spiegl Härtefühler für eine Wasserenthärtungsanlage
DE2910869C2 (de) * 1979-03-20 1984-01-26 Spiegl, Karl, 7031 Aidlingen Anlage zum Enthärten von Wasser
DE3406724C2 (de) * 1984-02-24 1986-03-13 Peter 7031 Aidlingen Spiegl Härtefühler für Wasserenthärtungsanlagen
DE29905050U1 (de) 1999-02-25 1999-06-17 oc wassertechnik GmbH, 78052 Villingen-Schwenningen Einrichtung zur Aufbereitung einer Flüssigkeit, insbesondere Wasser

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2810692A (en) * 1953-08-18 1957-10-22 Permutit Co Ion exchange apparatus and method of operating same
US3246759A (en) * 1963-04-05 1966-04-19 Culligan Inc Regeneration control for ion exchange beds
US3250392A (en) * 1964-02-17 1966-05-10 Honeywell Inc Water softener system control apparatus
US3477576A (en) * 1966-10-03 1969-11-11 Honeywell Inc Water softener control

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2810692A (en) * 1953-08-18 1957-10-22 Permutit Co Ion exchange apparatus and method of operating same
US3246759A (en) * 1963-04-05 1966-04-19 Culligan Inc Regeneration control for ion exchange beds
US3250392A (en) * 1964-02-17 1966-05-10 Honeywell Inc Water softener system control apparatus
US3477576A (en) * 1966-10-03 1969-11-11 Honeywell Inc Water softener control

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3676336A (en) * 1971-01-11 1972-07-11 Ecodyne Corp Method and apparatus for water softening
US3768649A (en) * 1971-07-15 1973-10-30 Fleckenstein A J Regeneration sensing system
US3831754A (en) * 1971-08-16 1974-08-27 Morton Norwich Products Inc Fluid treating apparatus
US4385992A (en) * 1981-06-29 1983-05-31 Autotrol Corporation Water softener control
US4668386A (en) * 1985-08-26 1987-05-26 Autotrol Corporation Water quality monitor
US4737275A (en) * 1986-03-06 1988-04-12 Autotrol Corporation Resin pressure sensor for water treatment
US20020017495A1 (en) * 2000-07-21 2002-02-14 Hiroshi Iizuka Water softening device
US20060086648A1 (en) * 2004-10-27 2006-04-27 General Electric Company Conductivity sensor for an ion exchange water softener
US7329338B2 (en) * 2004-10-27 2008-02-12 General Electric Company Conductivity sensor for an ion exchange water softener

Also Published As

Publication number Publication date
GB1321083A (en) 1973-06-20
IT987504B (it) 1975-03-20
CA924534A (en) 1973-04-17
DE2017303C2 (de) 1983-08-25
DE2017303A1 (de) 1970-11-12
FR2039398A1 (de) 1971-01-15
BE749265A (fr) 1970-10-01

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