Title:
Water treating apparatus
United States Patent 2296713


Abstract:
6 Claims. This invention relates to improvements in water treating apparatus and it consists of the matters hereinafter described and more particularly pointed out in the appended claims. The invention is more especially concerned with water treating apparatus wherein treating reagent is drawn...



Inventors:
Hinsch, Walter H.
Application Number:
US34165140A
Publication Date:
09/22/1942
Filing Date:
06/21/1940
Assignee:
DEARBORN CHEMICALS CO
Primary Class:
Other Classes:
137/578
International Classes:
C02F1/68
View Patent Images:



Description:

6 Claims.

This invention relates to improvements in water treating apparatus and it consists of the matters hereinafter described and more particularly pointed out in the appended claims. The invention is more especially concerned with water treating apparatus wherein treating reagent is drawn through a pipe, from a supply thereof, by the suction action of the water handled by a pump forming a part of the apparatus and then mixed with that water to make it suitable for boiler use.

There is a definite trend on the part of railroads to convert at least some of their wayside water stations to the so-called "electric automatic type" in which the control for the water supply pump, normally of the centrifugal type, is effected through a float controlled switch or a pressure controlled switch. When such wayside stations have a limited or low coisumption of reagent and include a pump of the centrifugal type, the treatment of the water presents a problem. While other apparatus may solve the problem, the use of such apparatus, which is relatively expensive, is not economically justified or practical at stations having a low consumption of such reagent.

In apparatus of this kind that includes a centrifugal pump, it is possible for the inlet end of the feeder pipe in the reagent supply to become uncovered because of the drop in the level of the reagent due to consumption thereof. When said end of the feeder pipe becomes uncovered and admits air thereinto, such a condition causes the pump to become air-bound. When air-bound the pump will move but a small amount of wate if any at all. Also, the pump may become damaged if run for an extended period of time in an air-bound condition.

One of the objects of the present invention i to provide apparatus of this kind, wherein th reagent feeder pipe is automatically closed a a predetermined low level of reagent in the sup ply, due to the consumption thereof, so that it impossible for air to pass through said pipe t enter the pump of the apparatus and cause it t become air-bound.

Another object of the invention is to provid means in an apparatus of this kind which, whi simple and inexpensive, is fully automatic an is efficient and reliable in operation for its in tended purpose.

Also, it is an object of the invention to provi4 means in an apparatus 6f this kind wherein t reagent line is closed when the pump of t] apparatus is stopped and is automatically open, (CI. 210-29) so soon as the pump starts to function for its intended purpose.

The above mentioned objects of the invention,' as well as others, together with the advantages 6 thereof, will more fully appear as the specification proceeds.

In the drawings: Fig. 1 is a view in side elevation of a water treating apparatus embodying the preferred form 10 of the invention, the tank of the apparatus for holding the reagent supply being shown partly in vertical section for illustrative purposes; Fig. 2 is a top plan view of the apparatus appearing in Fig. 1; 15 Fg. 3 is a diagrammatic view of an electrical circuit embodied in the apparatus and also shows a certain valve that is included in said circuit, in vertical section and which will later be described, and 20 Fg. 4 is a view in elevation, on an enlarged scale, of certain parts appearing in the upper right hand corner of Fg. 1, with a certain switch therein, shown partly in vertical section better to disclose the invention.

25 Referring now in detail to that embodiment of the invention, illustrated in the accompanying drawings: 5 indicates an upright cylindrical tank forming a part of the apparatus. This tank which may be made of sheet metal, is adapted to 30 contain a supply of water treating reagent in fluid form. It has a closed top 6 in which is provided a door I by which suitable chemicals may be introduced into the tank, to be mixed with water therein, to provide the fluid water treatr 35 ing reagent. If desired, the tank may include suitable means for agitating the chemicals and e the water in the tank. However, as the agitating means mentioned forms no part of the present s invention, it is not illustrated herein. e 40 A pulley or sheave 8 is mounted on the closed ,t top 6 at a point near the periphery thereof. A S cable or other flexible member 9 is trained over is the top of said pulley with one end entering the o tank and there carrying a float 10. The other o 45 end of said cable is attached to an indicator II that slides on a vertically disposed graduated Le guide bar 12. This bar is fixed to the side wall e of the tank in line with but below the pulley.

ld The float 10 rises and falls with the level of the d 50 treating reagent in the tank and the indicator II falls and rises therewith in sliding engagede ment with the graduated guide bar 12. The inhe dicator, which best appears in Fig. 4, visibly he shows the level of the treating reagent, indicated ed 55 at 13, from the outside of the tank.

A short horizontal length of pipe 14 extend tangentially through and is fixed in a part o the upright side wall of the tank 5 a short dis tance above the bottom thereof as appears i1 Pig. 1. An elbow 15 is fixed to that end of th, pipe within the tank and this elbow has a swini joint connection with a second elbow 16. A feed er pipe 17 is operatively connected at one end tb the elbow 16 and is provided at its other an( inlet end with a strainer 18. The feeder pipl may be provided near the strainer with an ori. fice fitting 19 which determines the flow of reagent through said pipe. A float 20 is operative. ly connected to the pipe 17 near the strainer t( support the inlet end of said pipe at the proper submerged depth below the level of the reageni in the tank. A transverse bar 21 in the tank I limits the downward swing of the feeder pipe so that said pipe cannot swing into a position wherein the inlet end thereof will be disposed at an elevation lower than that end connected to the elbow 16.

From the above, it is apparent that the inlet or strainer end of the feeder pipe rises and falls with the level of the reagent in the tank 5 because of the swing joint connection between the elbows 15 and 16.

22 indicates a centrifugal pump having an inlet side 23 and a discharge side 24. Pipes 25 and 26 are connected to said sides of the pump as appears in Pig. 1. The pipe 25 leads from a supply of untreated water and the pipe 26 leads either to a reservoir for treated water or to the place of use of such water. The pump 22 is driven by means of an electric motor which best appears diagrammatically at 27 in ig. 3.

A pipe 28 operatively connects that end of the pipe 14 outside of the tank 5 with the water inlet pipe 25. In the pipe 28 near the pipe 25 is a normally open, manually operable valve 29 for closing off the passage for treating reagent through the pipe 28 when necessary.

A self-closing but electrically opening valve 30 is disposed in the pipe 28 near the tank 5 As best appears in Fig. 3, this valve, which is of known construction, includes a casing,31 having a partition 32 with a passageway 33 therein.

The partition is formed about the top end of said passageway with a valve seat 32a. The casing 31 supports a housing 34 in which is located a magnetic coil 35. In the coil is a movable armature 36, that has a lost motion connection with a valve plug 37 that functions to open and close the passageway 33 and thereby control the flow of passage of treating reagent 13 from the tank 5 into the pipe 25. When the coil 35 is energized; it attracts the armature 36 thereinto.

This lifts the valve plug 37 from off the seat 32a to permit the passage of treating agentthrough the pipe 28. When said coil is deenergized, a spring 38 acts upon the top end of said armature and moves it downwardly and the valve plug 37 then engages upon the seat 32a. This stops the passage of reagent through the pipe 28. 40 indicates a motor control or switch having three conductors 41, 42 and 43 leading thereto from a suitable source of current supply. Three conductors 41aI,42a and 43a lead from the control to the motor 27. By means of said control 40 the motor 27 may be started and stopped at 1 will.

44 indicates a normally closed witch, suitably supported upon the side wall of the tank 5 adjacent the upper end df the graduated bar 12. It includes a casing 44a in which is provided a 7 s fixed contact 5 and a movable contact 46. This f lattere ontact -is made as a spring finger and engaged therewith s one ond of a plunger 47.

1 Said plunger has a sliding guided engagement in e 5 apart of the casing and its outer end is so S disposed as to be normally engaged by a lever - 48. This lever is pivoted at its bottom end to 3 the casing, at a point 49 below the plunger 47 e and the top end of said lever carries a roller 50.

3 10 The roller 50 normally adsumes a position slightS ly overhanging the plane of the adjacent side of the indicator II that has the sliding bearing on the graduated bar 12. A stop 51 on the switch casing 44a limits the swinging movement of the lever 48 away from the casing 44 to dispose the S roller 50 in the position mentioned.

S In Fig. 3 appears the wiring diagram for the circuit of the motor 27, the valve 30 and the Sswitch 44. The circuit includes a terminal block * 20 52 upon which are mounted terminal bars 53, 54, 55 and 56 respectively, the two terminal bars 54 and 55 being electrically connected together at S one end by a conductor 57. One side of the coil 35 of the valve 30 is connected by a conductor 58 to the terminal bar 53 and this bar is connected by a conductor 59 to the fixed contact 45 of the switch 44. The movable contact 46 of said switch 44 is connected by a conductor 60 to the terminal bar 56 which in turn is connected by a conductor 61 with the conductor 41a. The other side of the coil 35 is connected by a conductor 62 with the terminal block 54 and the terminal block 55 is connected by a conductor 63a to the conductor 43a leading to the motor 27. When the motor control or starter 40 is "off" or "open," it i: apparent that even though the switch 44 is closed, the coil 35 of the valve 30 is out of circuit a:id therefore, the plug 3T is engaged upon the seat 32a. This closes off the valve passage 33 so that no reagent can flow through the pipe 28.

Assume that the demand for treated water is such that it is necessary to start the motor 27 to meet that demand. The control or starter 40 is then closed, either manually or automatically in accordance with that demand. When so closed, current flows from the conductors 41, 42 and 43 to the conductors 41a, 42a and 43a to energize and start the motor 27. Current also 0 flows from conductor 41 a through conductor 61, terminal bar 56, conductor 60, through the closed switch 44, conductor 59, terminal bar 53, con- ductor 58 to and through the coil 35 and then through conductor 62, terminal bar 54, conductor 51, terminal bar 55, conductor 63a to conductor 43a.

This energizes the coil 35 to attract its armature so as to lift the plug 37 from its seat 32a.

This opens the passage 33 in the valve 30 so as 80 to permit the passage of reagent through the pipe 28. This assumes of course that the valve 29 is open. Under these conditions, the suction action or pull of the water now flowing through the pipe 25, pump 22 and pipe 26, induces a flow of treating reagent from the tank 5 through the feeder pipe 17, elbows 15 and 16, pipe 14 and pipe 28 into the pipe 25. Said reagent is thoroughly mixed with the untreated water flowing through the pipe 25 to make the same fit for its intended '0 use.

It is apparent that as the treating agent 13 in the tank 5 is consumed in use, its level will fall or descend and by reason of the float 20 the inlet end of the feeder will descend in accord5 ance with the descent of said level. As the level 29,2a,718 of fthe reagent in the tank I descends, th indiof the reagent in the tank cator I I will move upwardly on the bar 12 toward the switch lever 48.

Assume in one of the operations of the pump 22 that due to the consumption of the reagent and to the inattention of the operator to his duty in maintaining a proper level of reagent in the tank 5, the level of the reagent is approaching gentement in a path disposed in operative relaone wherein the strainer II of the feeder pipe 1I will soon be exposed to atmosphere. Should this 6ccur, air will be drawn into the pipe-2 so that the pump 22 will become air-bound which is a condition it is desired to avoid. -As this low level of reagent is approached, the indicator II will have reached such a position on its bar 12 as to have engaged the roller Ii of the switch lever so as to cause the contacts 4-4 the switch 44 to be separated. This cuts the coil 25 out of circuit so as to be deenergized l35 out o ircuit0st be dn whereupon plug 31 will engage upon the seat 32ai 20 and-close the valve to the passage of reagent r air therethrough. Thus the pump 22 maykeep on running without damage but the water passed thereby will not be treated. When the attendant again fills the tank 5 with water and adds the chemical, the level of the reagent in the tank 5 will rise. The indicator II then descends, the bar 12 and the switch 44 will again automatically close to restore the parts to operative position close to restor the the parts to operation.tive position ready for the next operation When the motor control or starter 4 open, the entire plant is in its "at rest" condition and the valve 20 is closed. As soon as the motor starter is closed, the valve 0 opens and the plant starts into operation. If the level of reagent 13 in the tank 5 descends to predetermined low level, the valve 30 is closed even though the pump 22 is in operation. Therefore, no air can be taken into the pum be taken into the pump. While In describing the invention, I have referred in detail to the form, arrangement aid construction of the parts involved, the same is to be considered only in the illustrative sense so that I do not wish to be limited thereto except as may be specifically set forth in the appended 45 the latter.

4. In a water treating apparatus, the combinaclaims.

I claim as my invention: 1. In a water teating apparatus, the combination of a tank for holding a supply of reagent fluid, a pipe through which water may flow, a 50 conduit connecting said tank and said pipe and through which conduit reagent fluid may flow from said tank into said pipe, a valve in said conduit and including electrical means for norall holding the same open when energized and 55 other means for closing said valve when said electrical means is deenergied, a circuit for said electrical means, a switch mounted upon the outside of said tank and disposed in said circuit and normally holding the same closed, a member 60 mounted for guided movement on said tank adjacent said switch, and means in said tank that rises and falls with the level of the fluid therein and which means is operatively connected to said member, said member at a predetermined level of fluid in said holding means operating the switch to so affect said circuit that said valve closes to prevent the passage of fluid through esi copnd t 2. In aidwater treating apparatus, the combination of a tank for hoding a supply of reagent fluid, a pipe through which water may flow, a conduit having un inlet end opening into said tank and having an outlet end connected to said tank and having an Outlet end f td m ts pipe and through which conduit fluid may Ps s from said tank into said pipe, an electrically opf descends, thh indierable valve in said conduit for controlling the passage of fluid therethrough and which valve is normally open, a circuit for said valve, a switch in said circuit and including an actuating member, a float in said tank arranged to rise and fall with the level of the fluid therein, and fluid level indicating means having a guided movement in a path disposed in operative rela10 tion with respect to said switch and so conneted to said float as to move in one direction with the rise and in the opposite direction with the fall of said float, said means in the fall of said float through said actuating member causing said 15 switch to so affect said circuit that said valve closes off said conduit before the level of said of fluid falls to such an extent as to uncover said inlet end of the conduit and permit air to enter and pass through the latter.

a wate treating I pparatus, the combi3n a tankfor holding a suppla of reagent nation of tank for holding a supply of r a fluid, a pipe through which water may flow, a conduit having an inlet end opening into said tank and having an outlet end connected to said 25 pipe and through which conduit fluid may pass from said tank into said pipe, an electrically operable valve in said conduit for controlling the passage of fluid therethrough and which valve is normally open, a circuit for said valve, a switch 30 mounted on the tank and including an actuating me ra mable member for engaging and is member, a movable member for engaging and perating the switch actuating member, means on the tank providing a guided path of movement for said movable member in operative re35 lation to said actuating member, and means connecting said movable member to said float so as to move in accordance with the rise and fall of said float, said movable member in the fall of said float engaging said actuating member as it 6s the atte to s 40 approaches the switch to cause the latter to so affect said circuit that said valve closes off said conduit before the level of said fluid falls to that extent which will uncover said inlet end of the conduit and permit air to enter and pass through tion of a tank for holding a supply of reagent culating pump having a suction fluid, a water circulating pump having a suction side and a discharge side, a water pipe connected to said suction side of the pump, a conduit haying an inlet end opening into the tank and having an outlet end connected to said pipe and through whicht reagent is drawn from said tank into said pipe under the action of said pump, an electrically operable valve in said conduit for controlling the passage of reagent therethrough and which valve is normally open, a circuit for said valve, a switch in said circuit and including an actuating member, a float in said tank and rising and falling with the level of the fluid in said tank, fluid level indicating means having a guided movement in a path disposed in operative relation with respect to said switch and so conneted torise and float as to move in accordance with the rise and fall of said float, said means in the fall of said float engaging said operating member of the switch as it approaches the same to cause said switch to so affect said circuit that Said valve closes off said conduit before the level 0 of said fluid falls to that extent which will uncover said inlet end of the conduit and thereby prevent air from passing through the conduit and pipe and then into the pump to produce an airbound condition thereof.

5. In a water' treating apparatus, the combina5. In aw ton of a tank for holding a supply of reagent fluid, a pipe through which water may flow, a conduit having an inlet end opening into said tank and having an outlet end connected to the Pipe and through which conduit fluidi may pass from said tank into said pipe, an electrically operable valve in said conduit for controlling the passage of fluid therethrough and which valve is normally open, a circuit for said valve, switch means for said circuit and including an actuating member, a float in said tank arranged to rise and fall with the level of fluid therein, means having a guided movement in a path disposed in operative relation to at least a part of said switch means and so connected to said float as to move in one direction with the rise and in the opposite direction with the fall of said float, said means in the fall of said float, through said actuating member causing said switch to so affect said circult that said valve closes off said conduit before the level of said fluid falls to such an extent as to uncover the inlet end of the conduit and permit air to enter and pass through the latter.

6. In a water treating apparatus, the combination of a tank for holding a supply of reagent fluid, a pipe through which water may flow, a conduit having an inlet end opening into said tank and having an outlet end connected to the pipe and through which conduit fluid may pass from said tank Into said pipe, an electrically operable valve in said conduit for controlling the passage of fluid therethrough and which valve is normally open, a circuit for said valve, a switch means for said circuit and including an actuating member, a float in said tank arranged to rise and fall with the level of fluid therein, a second' means adapted to cause operation of the switch through its operating member, one of said means having a guided movement in a path disposed in operative relation with respect to the other means and so connected to said float as to move in one direction with the rise and in the other direction with the fall of said float, one of said means in the fall of said float operating through said actuating member to cause said switch means to so affect said circuit that said valve closes off said conduit before the level of the fluid falls to such an extent as to uncover the inlet end of the conduit and permit air to enter and Pass through the latter.

WALTER H. HINSCH.