Патент USA US2354964код для вставки
Aug- 1, 1944- H. J. OSTERMANN ETAL 2,354,964 LIQUID LEVEL SENSITIVE APPARATUS Filed May a. 1959 I ' g: E‘ 6 I IINVENTOR. ?ansdwfemam and meadow/4. Cohen _ ‘ ATTORNEYS. 2,354,964 Patented Aug. 1, 1944 "UNITED STATES. PATENT OFFiCE ' ZM”! , ' uoum mm. smsrrrva mana'ros Ohi HansLOItermannandTheodoI-eLCohen, , to IlL, assignon, bymeane assignments. lnstrumentscomnm, Chicago, 111., a _ co corporation of Illinois Application May 8, 1989, Serial No. 271,865 9 Claim!- icl. 73-804) This invention relates to liquid level sensitive apparatus in general and more particularly to such apparatus adapted to perform various use ful functions in accordance with variations in liquid level in a liquid container, and this appli cation for patent therefor is a continuation in of our copending application . Ser. No. 267,326, ?led April 11, 1939, for Liquid level sensi sistor II and a grid condenser I‘ to the'grid ii of an oscillator tube II and the other side con- ' ‘ nected to the ?lament I‘ of said tube. A ?lament heating source I! is provided for ?lament ii. The oscillator tube has a plate ll connected to one side of a plate tank comprising a plate tank inductance II, and a variable plate capacity 25. The other side of the plate tank is connected to a plate power source 23 through an isolating tive apparatus. _ coil 22 and a neutral position relay 24. The primary object of this invention is to pro 10 choke A coupling or by-pass condenser 20 is connect vide an improved liquid level sensitive apparatus ed between the ?lament and a point between the - responsive to variations in liquid level and per ‘choke'coil i2 and the plate tank ll-Ii. forming certain useful functions, such as record ‘ The tank ii-Ii in. the plate circuit is tuned ing and indicating liquid level changes, in ac to predetermined resonance with the grid tank cordance with such variations. ' 1+“, when the level-[is at the chosen initial Other and further objects of this invention will point; the tuning being so chosen that the plate be more apparent hereinafter from an examinay current through the relay II, at such initial tion of the speci?cation and claims in conjunc point, is at such level as to keep the relay con tion with the accompanying drawing wherein: I tact I! in the neutral position shown. Should Fig. 1 represents a schematic view of a par a liquid level change occur, the capacity change ticular embodiment of the invention showing a’ thereby produced will change the tuning of the liquid level sensitive apparatus responsive to grid tank 1—l-|2 deresonating or reresonatr' variations of liquid level in a container such as ing same depending upon direction of liquid level a boiler, storage tank etc. and for performing change together with the plate tank 2 I-II; caus various useful functions in accordance with such 25 ing a change in plate current throughQrelay 24 variations; 1 x ' Fig. 2 represents a similar view of a modi?ca which thereupon makes contact 88 or 31 de pending upon whether the liquid level has in creased or decreased at 4. Thus the plate cur . Fig. 3 is‘a detail fragmentary sectional view of 30 rent will act upon relay 24 corresponding to va a modi?ed form of liquid level sensitive induc riations in liquid level from said initial point tance device capable of use in either of the cir correspondinglycontrol other means herein cuits of Figs. 1 and 2 in lieu of the liquid level . to after described including means for restoring the _ tion; , sensitive capacity device shown therein. _ predetermined resonance of the circuit. Referringto Fig. 1, reference character i, des armature and contact plate 35 of the re ignates theliquid input to a container 1 which 35 layThe 24 is connected, preferably through a ?exible may be a boiler, storage tank or'the like.. The ' ' conductor I8, and through an anti-hunting de container 2 contains liquid 3 at a variable level vice 32-43-444“, tobe more particularly de 4 and, is provided with upper and lower gauge scribed hereinafter, to one terminal of a source ?ttings 5 and it, respectively,‘ supporting theree between a glass or non-metallic gauge tube 6. A pair of ?xed vertically ‘extending metallic conductors l and ‘I are provided on opposite sides of the glass 6 and act as condenser plates. They may be in the form of metal strips or they may be sprayed or plated on the tube 0. The liquid 3‘ in the glass 6 acts as a dielectricand any varia tion in level of said‘liquid correspondingly varies - the capacity of the condenser formed by the con 40 of current ii for a reversing motor 30. The mo tor SI is of a suitable type provided with a pair of ?eld coils (not shown) having terminals 300 and 800, respectively, and a common central ter minal 30b. Contact ll leads to terminal 300 and contact 31 leads to terminal 30c. Terminal Iiib leads to the other terminal of source 3i. ~ ' The grid-and plate tanks being predetermin edly resonated with respect to each other to such extent as to provide an intermediate plate cur ductors ‘I and t. rent level when the li'quidlevel l is at the chosen The conductors 1 and l are connected to the 60 initial point, armature "will assume a neutral opposite sides, respectively, of, a grid tank in position under such circumstances. Whenv the ductance" which together with the condenser ' liquid level is loweredfrom such point, the re formed by asid conductors constitutes said grid tank.‘ This grid tank may begrounded as at H and has one side connected through a grid re duction in capacity thereby across the grid tank detunlng the latter from the aforesaid predeter 2 2,354,964 mined resonant position with the plate tank and causing a rise in plate current above the afore said intermediate level, the armature 35 will contact with contact 33 to drive motor 35 in one direction; and when the liquid level is raised, armature 35 will contact with contact 31 by vir tue of lowering of plate current below said in and it will remain unbalanced unless and until that point is resumed and the liquid level sensi tive device in response to such resumption in level has effected such rebalance. But the relay itself is rebalanced after each change in liquid level as will be more particularly described herein after. termediate level to drive said motor in the op More particularly there is shown a container posite direction. 42 with liquid 4| therein at a variable level 44. The manner and means by which this motor 10 A glass or otherwise non-metallic hollow mem 35, controlled as previously described, acts in ber 45 depends from a non-metallic annular sup turn to restore the tuning and balance of the porting fitting 41 mounted in an opening in the oscillating circuit and operate other means, in top of container 42. The hollow member 45 is cluding liquid level indicating and recording de sealed at its lower end to exclude liquid and is vices, will now be described. The motor 35 is provided with a pulley 23 and drive 25 therefrom, which may take any suitable form, connected to an indicator shaft 25b which in turn is drivingly connected by means of a suit partly immersed therein. It is shaped to provide a pair of opposite chambers for supporting there in a pair of vertically extending and horizontally spaced capacity elements 44 and 43. Here like wise the water in the container acts as a dielec able drive 21 to the shaft of variable plate tank 20 tric and the elements 43 and 44 act as plates of condenser 25. The amount and direction that the indicator shaft 251) and plate tank condenser 25 shaft are operated depends upon the degree and direction of rotation of motor 35. When a condenser. These elements 43 and 44 act sub stantially the same as elements 1 and 5 of the previous embodiment and are likewise connected, - respectively, to opposite sides of the grid tank tank condenser 25 has been thus adjusted sum 25 inductance 33, corresponding to the inductance ciently to restore the predetermined resonant ' |2 in said previous embodiment. Parts 48, 49, condition of the oscillating circuit, a pointer 25a on shaft 25b will indicate the new liquid level on 55, 5|, 52, 53, 54, 55, 55, 51, 55, 59, and 60 are similar to corresponding parts l3, l4, I5, l5, I5, l1, I5, 20, 23, 2|, 25, 22, 24, respectively, in the a dial 25 calibrated in liquid column height and the motor 35 will stop, because the relay 24 will 30 previous embodiment, except that here the plate be restored to neutral position. Thereafter any tank condenser 55 is not motor driven and the deviation in liquid level from the new liquid level will similarly unbalance the oscillating circuit with resultant restoration and indication in the relay 50 is differentially wound with an addition al coil 5| thereon adapted when energized to counteract and neutralize the eifect of the plate 35 current in the first coil thereof. Parts 55, 55a, same manner. , 59, ‘III, ‘II, 12, 13, 14,15, 15, ‘I1, 15, 19,55, 53, 54, The reversing motor 35 may be coupled to a recording mechanism and other devices either in the manner shown in our copending application 55, 55, and 51 are similar to corresponding parts Ser. No. 267,326, filed April 11, 1939, for Liquid 31, 25a, 32, 33, 38a, 54 and 3|, respectively, ex level sensitive apparatus, or by means of a cou pling or drive 23a, and such liquid level record ing mechanism and safety devices operable in accordance with liquid level changes may take 25b, 25a, 25, 26, 25, 30, 35a, 30c, 30b, 35, 35, 35, 40 cept that the indicator shaft 58 has no driving connection to the plate tank condenser. ‘Instead reversing motor 12 is suitably connected to drive a rotatable contact member 55 of a rheostat to vary the amount of resistance 54 in circuit with cation. 45 the counter-winding 5| of the differential plate relay. A source of current 52 is provided for such The anti-hunting device, previously referred circuit and also an ammeter 53 calibrated in liq to, may take any suitable form and be placed in uid column height. A recording apparatus 52 any suitable part of the electrical circuit or similar to that previously referred to in the mechanism but is here shown comprising a cam 32 on a suitably timed drive shaft 33. An inter 50 former embodiment and in our copendingappli cation aforesaid together with safety devices as rupter having stud 35a and contact 34 is oper also shown in said copending application may be ated at timed intervals by the cam 32 and intro driven from said drive 50 from the reversing duces a time lag which prevents recurrent motor. , cycling or hunting in the apparatus as a whole. Referring to Fig. 2, there is here shown a some 55 The amount and direction.that the rheostat what similar form of the invention, except that finger 55 must be moved by the reversing motor to suiliciently energize or deenergize the counter here the liquid level sensitive device, adapted to unbalance the oscillating circuit in accordance acting coil 5| in the differential relay to balance with the liquid level changes, is of the immersion the plate current in coil 55 to cause it to resume type and also, in this embodiment, the oscillating 60 the neutral position shown and stop said motor circuit itself is not restored to balance by the re after a liquid level change has occured is a meas versing motor. Instead a differential relay is ure of the extent of said change and indicative used in the plate circuit and the change in plate of the new level. Thus the finger 55 may itself current from predetermined intermediate level be an indicating pointer and the ammeter 53 an due to liquid level changes is counteracted and indicator both showing liquid level changes as neutralized during the restoration operation by well as indicator 55-55a-l0. In this embodi the reversing motor whereby the eifect of the un ment, when a liquid level change occurs, the ca balance of the plate current on the relay is neu pacity change thereby produced across the grid tralized and the relay in rebalanced to stop the tank will change the tuning thereof deresonat reversing motor and the indicator pointer at the 70 ing or reresonating, as the case may be, same to new level. gether with the plate tank; causing av corre the same form as shown in said copending-appli The oscillating circuit, in this embodiment, is adapted to be unbalanced by the liquid level sen sitive device in accordance with liquid level sponding change in plate current through relay coil 55 which thereupon makes contact 15 or ‘I5 depending upon whether the liquid level has in changes from the predetermined initial point, 75 creased or decreased at 45. 3 2,354,004 Referring particularly to Fig. 3,‘ there is here shown a modi?ed form of liquid level sensitive inductance device of the immersion type adapted to be inserted in liquid to cooperate with the . previous circuits in lieu of the liquid level sensi for automatically restoring the same independ ently of such unbalance of the circuit. ‘ \ 3. In an apparatus of thecharacter described, liquid level sensitive means, an electrical circuit adapted to be unbalanced thereby, a differential relay having counteractingcoils, one coil in said circuit and a control circuit containing the other coil and controlled by said ?rst circuit for auto its lower end to exclude the liquid 92 in the con matically rebalancing said relay. tainer (not shown). This member corresponds 4. In an apparatus of the character described, to member 45 in the previous embodiment and 10 liquid level sensitive means, an electrical circuit likewise is depending from a non-metallic ?tting adapted to be unbalanced thereby, a relay in said 88. In this case, however, a vertically arranged circuit and means responsive to said relay for inductance coil9l is mounted in the hollow im automatically restoring the same independently mersion member instead of capacity members oi such unbalance oi the circuit and for indicat such as 43-44. Inductor leads 8! are connected ing liquid level, change. * > to the terminals, including lower terminal 83, oi.’ 5. In an apparatus of the character described, the coil 9|. When this liquid level sensitive in liquid level sensitive means, an electrical circuit ductance device, including member 90 with coil adapted to be unbalanced thereby, a relay in said 9| therein, is used instead of the device, includ ing member 15 with capacity members 43-“ 20 circuit and means responsive to said relay for automatically restoring the same independently therein, in either circuit previously described, of such unbalance oi the circuit and for recording ‘said coil 9| may take the place of either of the liquid level change. following inductances: 39, I2, 2|, or 51 to unbal tive capacity devices shown therein. Herein is ‘shown a hollow immersed member 80 sealed at ance the respective circuits in accordance with liquid level changes in the same manner as the 25 6. In an apparatus or thecharacter described, liquid level sensitive variable electrical reactive cuits so function. means, an electrical circuit adapted to be unbal anced thereby, a relay in said circuit and means tanks as shown. liquid level sensitive variable electrical reactive liquid level sensitive capacity devices in said cir responsive to said relay for automatically re The oscillator circuits may take a variety of _ storing the same independently or such unbal forms and the liquid level sensitive inductance ‘ , " and/or capacity devices shown may be placed in 30 ance of the circuit. 7.. In an apparatus of the character described, other parts of said circuits than across the grid means, an electrical circuit adapted to be unbal anced thereby, a di?erential relay having coun nerically either capacitive reactance, inductive 35 teracting coils, one coil in said circuit, and a con trol circuit containing another coil and controlled ’ 'reactance or both. Where the term “electrical reactive” is used in \ the appended claims it is intended to cover ge We are aware that many changes may be made and details varied without departing from the principles of our invention and we therefor by said ?rst circuit for automatically rebaianc ins said relay. 8. In an apparatus or the character described. do not wish to be limited to the details shown or 40 liquid level sensitive variable electrical reactive means, an electrical circuit adapted to be unbal anced thereby, a relay in said circuit. a second We claim: ' circuit adapted to be controlled by said relay and 1. In an apparatus 01 thecharacter described, described. ' ‘ the combination of a liquid container, a pair of including a prime mover and a third circuit con contact with the liquid in the container and ex tending a substatnial distance above and below counteracting the degree or unbalance or said relay. spaced metallic members out of direct electrical 45 trolled by said prime a predetermined level of the liquid in such posi _ tion that change in said level will correspond for automatically 9. Inanapparatusotthecharacterdescribed, liquid level sensitive means, an electrical circuit ingly vary the capacity between said members, adapted to be unbalanced thereby, a di?erential an electronic oscillator connected to said mem insaidcircuitasecondcimritoontainingthe bers for detuning thereby and means, controlled in turn by said oscillator, for automatically re turning the oscillator and indicating the new liquid level. > 2. In an apparatus of the character described, liquid level sensitive means, an electrical circuit adapted to be unbalanced thereby. a relay in said circuit and control means responsive to said relay relay havingapairoicounteractingmoneccil other coil andcontrolledbysaidilrstcircuitior automatically rebalancing said relay and means responsive to the second circuit tor indicating liquid level changes. J. OW. A. com.