|Publication number||US3556689 A|
|Publication date||Jan 19, 1971|
|Filing date||Mar 5, 1969|
|Priority date||Mar 5, 1969|
|Publication number||US 3556689 A, US 3556689A, US-A-3556689, US3556689 A, US3556689A|
|Original Assignee||Hechler Valentine|
|Export Citation||BiBTeX, EndNote, RefMan|
|Referenced by (13), Classifications (33)|
|External Links: USPTO, USPTO Assignment, Espacenet|
Jan. 19, 1971 v. HECHLER IV 3,556,639
. PUMP FOR PROPORTIONING DEVICE v Filed March 5. 1969 I 2 Sheets-Sheet 1 0/ 3 I02 I oo 4 I I08 7 34 I04 92 TI -94 v INVENTOR VALENTINE HECHLER IV V/M7/w M Attorneys Jan. 19, MM v. HECHLER IV PUMP FOR PROPORTIONING DEVICE I 2 Sheets-Sheet 2 Filed March 5, 1969 //VVENTOR VALE/VT/NE HECHLEI? ll/ y Attorneys United States Patent US. Cl. 417-435 11 Claims ABSTRACT OF THE DISCLOSURE A reciprocating pump which has a zero to negative clearance with a valve serving as a cylinder head and the construction thereof wherein the sliding relation has a low frictional coefiicient with a piston head of plastic material engaging in sealed relationship a sleeve insert made preferably of glazed ceramic tubular sections which is readily assembled in place in a plastic support by a threaded element received in groups of segmented threads, and method for cutting all of same simultaneously.
CROSS REFERENCES This application contains divisible subject matter and is a continuation-in-part of application Ser. No. 520,568, filed Jan. 14, 1966, hereby expressly incorporated by reference herein; and application Ser. No. 625,086, filed Mar. 22, 1967.
BACKGROUND OF THE INVENTION This application is a continuation-in-part of and an improvement over the pump structure shown in the crossreference applications in that it eliminates the damage occurring with plastic or metal cylinder walls when pumping liquid with suspended abrasive particles in it. Moreover, cylinder sleeves can be readily mounted and readily interchanged with regards to various sizes of pistons if a dilferent output rate is desired in some applications with a plastic retainer fastening means adapted to hold the ceramic sleeve in working position.
More particularly in this respect the present invention further provides a weight reducing recess in a movable part that reciprocates the cylinder element. The recess is adjacent to a valved exhaust passage in a blind cavity defined by ribs which receive the sleeve whereby a retainer can be easily and releasably mounted in the recess to hold the cylinder sleeve in operative position. The cavity is so formed that all of the screw retaining threads can be out easily in segments with a 180 movement of a'thread cutter to receive the shank of a threaded screw whose flange overlaps a wall portion of the sleeve to hold it in its working position.
Another object of the invention is to provide motor and pump parts which have a low coefiicient of friction, employ inexpensive but efficient seals and valves for the working pump parts and if desired to further lubricate the flow and the parts with a polyalkylene oxide such as polyethylene oxide in the concentrate to minimize the pump working load upon the motor.
A further object of the invention is to provide a limited contact area for'the concentrate in the pump which can be flushed clean in seconds for or by another chemical concentrate entering the pump, and which when started, automatically primes itself and prevents any vapor lock that might otherwise develop in the system.
A further object of the invention is to rapidly prime a reciprocating pump by evacuating and compressing air to a pressure greater than the back pressure on a spring loaded exhaust valve and positively exhausting the compressed air through the valve against the elfort of the spring to hold the valve closed by making the exhaust ice valve at least a part of the cylinder head and positively engaging and displacing the head outwardly by the piston at a terminal portion of its stroke.
These being among the objects of the invention, other and further objects will become apparent from the description and claims including a simplified design and structure for ease of assembly, testing, installation, operation and servicing.
IN THE DRAWINGS FIG. 1 is a diagrammatical picture View of the device embodying the invention used for lawn care;
FIG. 2 is an enlarged longitudinally sectional view in the plane of the axes of the pistons of the pump and motor arrangement embodying the invention as the pump piston approaches the end of its compression stroke or after it begins its intake stroke;
FIG. 3 is a view similar to FIG. 2 showing the pump piston and cylinder head at the end of the compression stroke;
FIG. 4 is a top plan view of the motor piston showing the orientation and securement of the pump cylinder with a screw;
FIG. 5 is a perspective view of the reciprocating motorpump member of the invention for mixing concentrate in diluent in exact proportions;
FIGS. 6 and 7 are sectional views taken on lines 6 and 7 in FIGS. 2 and 4, respectively; and
FIGS. 8 and 9 show the apparatus and a two-stop method of cutting a full length thread with 180 rotation of a double land top to receive a screw for holding the pump cylindrical sleeve in place.
As more particularly described in the cross reference applications, diluent, such as water, flowing under pressure actuates a motor having flow responsive motor pistons which in turn operate pumps having pump pistons to aspirate and inject exact portions of concentrate, such as suspension mixture of fertilizer, into the diluent that put of the diluent and exhaust of the concentrate occur simultaneously for progressive mixing in the motor cylinder intimately and directly on each exhaust stroke. Each pump is provided with tandem self-closing output and intake pump valves which interengage at the end of the pump compression stroke and otherwise provide a double closure against the backfiow of concentrate to prevent flow of diluent into the concentrate intake passageway.
Referring now to the drawings in further detail an application of the inventive concept is demonstrated at 10 in FIG. 1 as used at either end of a garden hose 12 and is supplied with municipal water from a valved water tap 14 of a building 15 preferably through a short section of hose 11. Concentrate is drawn from an open or closed container 16 (FIG. 1). A spray wand 18 with a quick shut-off valve 19 is shown with a fan spray nozzle 20 to spray the mixture on lawn 22. The concentrate in container 16 can be a fertilizer with or without growth or selective plant control additives or for pest control solutions or suspensions. In place of the nozzle 20 shown in FIG. 1 an earth penetrating lance may be used for tree root feeding. The short length of hose 11 is preferably employed between the device 10 and the house to yield to lateral hose strains and eliminate any sound conduction to the building 'water pipe system. As described in said application Ser. No. 625,086 means is provided as indicated at 21 for controlling the flow of diluent selectively with or without concentrate.
Reference is made to said reference applications for the operation of the device as a motor. Suffice to say in this connection that two motor piston units (FIGS. 2 and 5) each having two heads 32, reciprocate in opposing motor cylinders 34 (FIGS. 2 and 3) under the force of water flowing under pressure, such as municipal water pressure. Each unit is controlled by motor valves (not shown) that are actuated by push and pull rods 36 and 38, respectively, that are formed integrally with an identical companion motor piston unit (not shown) which in turnisreciprocably controlled by the motor piston unit shown. Each motor cylinder 34 has a head 40 having a cross head concentrate intake manifold 42 (FIG. 2) supplying hollow pump pistons 44. Each pump piston is formed integrally with its respective cylinder head 40 and projects into the motor cylinder space 41. The manifold 42 supplies the pump pistons 44 with concentrate received from the container 16 after they are primed The pump pistons extend into the respective motor cylinders a distance suflicient to cooperate with the motor pistons 32 throughout their excursion and the motor pistons in turn are cored out with ribbed blind holes 48 to receive a pump cylinder sleeve 76 that cooperates with the pump piston 44 as will now be described.
As more particularly shown in FIGS. 4 through 9, the piston 30 of molded plastic is cored out and lightened wherever possible for low inertia and high acceleration in its action. At opposite ends the motor pistons are provided with two axially spaced circular flanges 50 providing an annular groove 52 between them receiving an elastomer chevron seal 54 (FIG. 2) with its marginal V flanges 56 directed towards the cylinder head 40. The interconnecting mid portion 58 (FIG. 5) of the piston heads is reduced in size and flattened at 60 very close to the axial center thereof with corner brace portions 62 supporting the head portion.
I The two elongated blind holes 48 are cored in the piston head portion and extend into the mid portion with a segmented wall therebetween forming two segments 66 with parallel facing edges 64 spaced approximately the same distance as the remote walls 68 of the two holes 48 to a predetermined depth. At this depth the segmented walls 66 are offset towards each other to provide shoulders 70 below which the bottoms of the blind holes are recessed as at 72 to receive a spring.
' A shallow recess 74 adjacent to the inner one of the walls 68 cross-sectionally defines a segment of a circle. As shown in FIGS. 8 and 9, the opposite walls of the recess 74 are threaded at their widest spacing as at 78 by a threading tool 80 having diametrically opposite lands 82 whereby the flutes 84 are inserted full depth into the recess between facing the walls 76 (FIG. 8) and the tool is turned 180 clockwise (FIG. 9) to cut the threads all at once and then remove to receive screw 86 (FIG. 7) having a wrench receiving opening 88. This relationship is one in which the major dimension of the recess in its longest portion of its cross-sectional shape is greater than the crest diameter of the threads and the minor dimension normal to the major dimension is less than the crest diameter of the threads. Accordingly, the threads of each segment taper in their height from their mid point and the length of their root are over twice their maximum crest height whereby a threaded mating member is easily started in its threaded relationship therewith.
The cored-out holes 64 receive a pump cylindrical ceramic sleeve 76 therein having heat glazed inner and outer surfaces rounded at their inner rim edge 71 where they rest on shoulders 70 while extending very slightly above the face of the piston at the other end. The outside diameter of the sleeve preferably is received with slight radial looseness between the edges 64 of the segmented wall portions 66 and the remote walls 68. The reprises an externally conical elastomer washer 92 (FIGJ' piston seals against metal.
Air or concentrate is ingested lnto the..cylinder sleeve maining area of the blind holes 48 serve as an exhaust passage 67 back to the face'69 of the piston heads.
-A disc is disposed at the inner end of the cylinder sleeve 76 to cooperate therewith in a dual capacity of a cylinder head and pump output check valve that normally closes against the inner end thereof-under the influence of a light compression spring 98. The disc com- 3) and a rivet element 94 securing it to a washer 96 whose outer edge is received in guided relation by the ribsbelow the shoulders 70 upon which the sleeve rests.-
A compression spring 98 bottoming inthe recess72' urges the disc to closed position with the margins of the elastomer washer 92 engaging the rounded rim edge 71 of the sleeve 76. Preferably the spring 98 is conical so that it can flatten when fully compressed when the disc valve opens.
A flanged sleeve member 100 is press fitted into the end of the sleeve piston 44 and is provided with an internal shoulder 102 at the inner end thereof to help support the pump intake check valve 104. The disc-like valvef element 104 closes against the end 105 of the sleeve member as an inlet valve and is urged in that direction by an involuted compression spring'106 interengaging cooperates as a pump seal with the glazed inner wall of the plastic sleeve cylinder 76 which surprisingly reduces to less than a third of the friction and wear of resilient 76 through the inlet valve 104 on the retracting movement of the pump piston 44 for substantially the full movement thereof and then is forced out therefrom into the motor cylinder 34 through the outlet valve 90 and exhaust passage 68 around the sleeve cylinder 76 as the motor piston 30 advances to exhaust diluent ahead of it. Thus, concentrate is injected in exact proportions into the motor cylinder and intimately mixed with each discharge of diluent by the motor pistons.
It will be appreciated that water under back pressure also assists in closing exhaust valve 90 and it is to be noted that as each pump piston 44 reaches the end of its movement (FIG. 3) the intake valve 104 engages and positively opens the outlet valve 90 enough to release any compressed air that may be trapped between them and thereby assures a quick and full prime, otherwise there being a substantial back pressure of diluent against the outlet valve 90 a full evacuation of such air might be inhibited. This is significant since the concentrates are changed from time to time with air in their containers and full priming immediately is desirable with the first couple of strokes of the motor piston for quick and accurate proportioning with changed concentrates. Otherwise, air drawn from the container could expand and contract endlessly in the pump cylinder 76 without the outlet valve 90 opening under high diluent back pressures. Accordingly, the assured discharge of entrapped gas each stroke is replaced by some concentrate intake and within two to four strokes of each of the four pistons, an otherwise air bound pump is fully primed. Thereafter, the pump is capable of lifting concentrate a substantial distance by developing a partial vacuum or negative gauge pressure as low as 3 lbs. per square inch, absolute, without changing the resulting output volume of the concentrate each stroke.
Having thus set forth the objects and described a pre ferred embodiment of the invention with its novel arrangement of parts and results attained, it will be seen tion, the scope of which is commensurate with the ap.- pended claims.
What is claimed is: 1. A self priming reciprocating pump for liquids comprising a body including a pump cylinder means for one fluid with an open exhaust end and having an exhaust space therebeyond, an exhaust valve means reciprocable in said space to engage said open end for closing and opening said open end, means including a second fluid under pressure in said exhaust space urging said exhaust valve to close said open end, piston means reciprocably mounted in said cylinder, means including said second fluid for reciprocating said piston means and cylinder means with respect to each other with a negative clearance between the piston and the valve means at the end of the exhaust stroke of their relative reciprocation.
2. In a device of the class described, a self-priming pump for one fluid comprising a pump cylinder having a movable head externally subjected to a liquid under a gauge pressure, piston .means in said cylinder. means for reciprocating said piston and cylinder with respect to each other including said liquid under gauge pressure with an end stroke clearance of substantially zero to negative clearance between the piston head and the cylinder head at the end of their compression stroke.
3. The combination called for in claim I in which said piston has an inlet passage therethrough opening as a' valve port at its head end, an inlet valve admitting said one fluid and closing said valve port upon a compression stroke, said cylinder having an open end with said head constituting a valve member closing under said gauge pressure against the open end of said cylinder upon the intake stroke of said piston.
4. In a device of the class described, a housing having an inlet opening for receiving municipal water from a dwelling faucet, means in saidhousing actuated by said water and including a motor piston carrying a pump cylinder having a movable head and piston pump means for pumping a second liquid and displacing said movable head to open it at the end of each compression stroke.
5. The device defined in claim 4 including a flexible conduit means interconnecting said inlet opening and said faucet with the housing in depending relationship.
6. A pump for liquids including a blind cavity with longitudinal rib means on its wall portion, cylindrical sleeve received in said cavity'as supported by said rib means to define therewith fluted exhaust passages, shoulder means on said rib meanssupporting the inner end of said sleeve, exhaust valve means guided by said ribs beyond said shouldersfor cooperation with the exhaust end 6 of the sleeve, resilient means urgingsaid valve means to close against the exhaust end of the sleeve, piston means reciprocable in said sleeve having a negative clearanceat one end with the valve means on is exhaust stroke, andretainer means for securing said sleeve in place against said shoulders, said exhaust passages interconnecting the exhaust end of the sleeve and a contractible space surrounding the opposite end of said piston means.
7. The combination called for in claim 6 in which said sleeve is made of ceramic heat glazed internally and provided at its exhaust end with a glazed rounded rim, and said piston includes an elastomer seal slidably engaging said sleeve internally.
8. The combination in claim 6 in which said piston means is hollow defining an inlet passage and includes an inlet valve atits inner end, spring means in said inlet passage supporting said valve and urging same to its closed position.
9. The combination called for in claim 6 in which said body has a threaded wall portion defining a recess adjacent to the blind cavity with a major dimension greater than the crest diameter of the threads and a minor dimension less than the crest diameter of the threads said threads being segmented in groups in which the angular length of the root of each thread is differentfrom the crest length of full thread height for easeof starting the threaded engagement therewith of said retainer means having a continuous" mating helical thread and a flange portion securing said sleeve in place.
10. The method of priming a liquid pump cylinder havinga movable cylinder head portion including compressing on the compression cycles of the pump any compressible fluid present in the pump cylinder, and physically discharging from the cylinder quantities of the compressed fluid under gauge pressure along with liquid present in the cylinder into a liquid under gauge pressure by physically displacing said portion of the head at the ends of a succession of compression cycles to evacuate the compressible fluid from the ,cylinder.
11. The method called for in claim 10 in which said displacement is accelerated incyclic movement towards the end of its exhaust stroke when contacting said head portion.
References Cited UNITED STATES PATENTS 2,481,183 9/1949 Welby 1o3--203 2,761,391 9/1956 Johnston' 103 3s 2,768,587 10/1956 Corneil 103 l66.5 ROBERT M. WALKER, Primary Examiner
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|International Classification||A01C23/00, G05D11/00, F04B53/10, F04B53/12, F04B53/16, F04B53/00, F04B19/00, B05B7/32, F04B9/00, B05B7/24, A01C23/04, F04B9/115, F04B53/14, F04B19/02|
|Cooperative Classification||F04B53/127, A01C23/042, F04B53/14, F04B53/162, F04B53/10, F04B9/115, B05B7/32, F04B19/022, G05D11/00|
|European Classification||F04B53/16C, F04B53/12R4, F04B9/115, B05B7/32, G05D11/00, F04B53/14, F04B19/02H, A01C23/04B, F04B53/10|