Патент USA US2412095код для вставки
Dec. 3, 1946. 2,412,095 R. w. MUERLE 1 PRESSURE SWITCH Filed Feb. 23, 1942 /2 Z6 34 23 22 Z4 /7 II lllqllll’ : fig. 7 [/2 06/2 tor Ez'chardCU/VI z/er/e 3g ' ' A f for/2 e9 ‘2,412,095 Patented Dec. 3, 1946 panel) STATES ’ PATENT OFFICE PRESSURE SW'ITCH Richard W. Muerle, Spring?eld, I_ll.,- assignor to Montgomery Ward (SE-1C0.’ Incorporated, Chi cago, 111., a corporation of Illinois Application February 23, 1942, Serial No. 432,051 4 Claims. (Cl. 200-83) I 1 This invention is directed primarily to preven tion of clogging of ori?ces or apertures in the baffle used for dampening sudden pressure varia tionsin fluid pressure switch apparatus such as is used on automatic water pumps, air compressors, I and the like. The invention is concerned particularly with the type of apparatus having a switch operating dia phragm forming part of a pressure chamber or other expansible chamben. Such a pressure :10 chamber, in turn, communicates with a pump or compressor, or with a pressure tank, through a constricted ori?ce Or aperture in order to dampen 2 disadvantage that the small diameter holeclogs readily, particularly when the water contains such impurities as lime or other minerals, of cor rosive composition. In actual use, the clogging of these small holes leading to the diaphragm is ‘more frequent than would ordinarily be supposed, and'it is a persistent source of trouble and danger where-clogging and stoppage occurs. As the pres sure'drops in the tank, the motor will start and will not cut off, and dangerous pressures may re sult. It will be appreciated that the smaller the aperture, the more effective will be the damping action and the more likely the aperture to clog. Thus, by providing means preventing such clog out the pump pressure pulsations before they can reach the switch operating diaphragm. In such 15 ging, the aperture may be made smaller and more effective. devices the ori?ce tends to clog from corrosion or It is therefore an object to provide a means for caking, caused by foreign matter such as minerals keeping ‘the ori?ce from the water way to the dia and the like in the fluid beingpumped, and it is phragm pressure chamber open. the primary object to provide means to prevent It is a further object of the invention to pro clogging of such ori?ce. vide a diaphragm having means projecting into In ordinary practice, a typical arrangement is and automatically moving (with changes in pres a pressure water system which comprises a, pump, sure) in the ori?ce, which means operates to keep an electric motor, a pressure tank, and a fluid the ori?ce open at all times. pressure regulator or switch. This ?uid pressure It-is-a further object in this connection, to pro switch is connected to, or close to, the pressure 25 vide a diaphragm which has a wire or spring at side of the pump-that is, the side of the ‘pump tached thereto or operated thereby, in such ar 1 from which fluid is forced into the pressure tank rangementthat the wire or spring extends into after leaving the pump. the ori?ce whereby movement of the wire will oc ‘Switches of this type usually are equipped with cur under changes of pressure, forceably breaking a standard switch mechanism in which the dia 30 loose any obstruction, deposit or corrosion tending phragm is forced by ?uid pressure to exert the to close the orifice. necessary pressure on the standard switch mech It is a further object to provide ‘such an ar anism to actuate the switch. In this arrangement, rangement in which the wire is wavy or angular the current pulsations of reciprocating pumps or provided with projections or serrations which may cause the switch mechanism to ?utter, par 35 serve to cut, scrape, or break the deposits of lime ticularly if the tank is remotely located, in turn causing arcing and burning of contact points and consequent injury to the switch with possible fail or other foreign material in a very efficient man ner. vIt is another object of this invention to provide ure of the mechanism. In this connection, it is not a rare occurrence for such arcing to lead to 40 a modified construction in which the pressure chamber is intercepted by a disc or supplemental fusing of the contact points of the switch, ‘result diaphragm construction having one or more slits ing in continued operation of the motor and build or slots, the arrangement being such that move ing up a dangerous pressure. ment of the switch diaphragm distorts said in To counteract or dampen these surges or pulsa tions, it has been almost universal practice to re 45 termediate diaphragm, whereby lime and other deposits and the like will be broken loose under strict the water passage opening from the pump the stress of said distortion. to thediaphragm pressure chamber of the switch vOther objects and advantages of the invention by inserting into the water way a. plug or disc in will vappear as the nature of the improvements is which is usually drilled a small hole, commonly better understood, the invention consisting sub 50 from .010 of an inch up-depending on the power stantially in the novel construction, combination unit involved. This resists ?ow so that the pulsa and arrangement of parts hereinafter fully de tions are suf?ciently dampened to prevent ?utter ing or flickering, ' While this arrangement above described is gen erally satisfactory, it has the serious weakness or scribed, illustrated in the accompanying drawing, and ?nally pointed out in the appended claims. In the drawing: 3 enacts 4 Figure 1 is a fragmentary sectional side ele arating the contact points 25 from the contacts vational view showing my improvement as ap 26 which are in turn ordinarily connected to plied to a conventional switch, only a portion the electrical starting and operating circuit of of the switch mechanism being shown and the a motor and thus providing a circuit breaking cover or box being cut away; Cl “snap action.” Figure 2 is an enlarged side elevational view When the upward pressure is taken 01f of the showing a desirable form of projecting wire upwardly extending pronged plate l8, as by member or ori?ce cleaner which attaches to the downward movement of the diaphragm l9, the diaphragm; pressure spring l2 will move the rocker arm l6 Figure 3 is a bottom view of the device of 10 downwardly at its outer end shifting the mov able arm 23 and thereby change the direction Figure Ll is a fragmentary perspective view of pressure on the spring 22, thus moving the showing one form of my device as applied to movable arm 23 and causing the contact points the diaphragm of a conventional pressure switch; 25 to snap into contact position with the con Figure 2; Figure 5 is a plan view of ‘a modi?ed con struction showing a disc member with slits or slots; 15 tacts 26, in the position shown in Figure l. The diaphragm is securely held in place on the housing H by means of a cover plate 27, which Figure 6 is a fragmentary side elevational view is in turn held in place by small bolts 28, as showing the device of Figure 5 applied to a will be seen in Figure 4. The diaphragm L3 is conventional switch mechanism; and 20 pressure responsive and ?ts over an opening 29, Figure 7 shows a schematic arrangement of see Figure 4, in the housing Ii, preventing a pump and motor with a pressure switch (of the type described herein) attached, the View water entering the switch housing and damag ing the mechanism. The cover plate 27 forms, with the diaphragm It, a pressure chamber 30, being a side elevational view. Referring more in detail to the construction 25 sometimes herein referred to as diaphragm pres shown in the various ?gures, there is illustrated sure chamber. The switch housing is coupled to an embodiment of the invention as applied to a pressure line from a pump or pressure tank by a conventional fluid pressure switch. Figure '7 pipe means, or otherwise, 3! (see Figure 7 ) which illustrates a typical ?uid system in which a threads into or otherwise attaches to the inlet switch of this type is embodied. The device 30 32 of the pressure chamber 39. The pressure shown in Figure '7 comprises a motor ’112, the chamber proper is separated from the pressure pump 43 and a storage tank for water and the line or pipe 3!, preferably at the inlet 32, by like 1215. This tank 44 is the pressure tank to means such as a ba?ie or plug 33 as shown in which the switch (here shown in its entirety Figures 1, 2, and 4. The baffle 33 ordinarily as switch tit) is attached. Conventional elec 35 is provided with a hole or opening of small size, trical connections lead from the switch 45 to but suf?ciently large to permit water under pres the motor 42, and the pressure line or pipe 3| sure to pass therethrough from the pressure line connecting the pressure tank to the switch, as or pressure tank, whereby the pressure in the hereinafter more fully described, is shown. pressure chamber 30, is varied according to the Referring next to Figures 1 and 4, in par 40 pressure in the pressure tank or pump, as the ticular, the switch 45 comprises a switch housing case may be. Change in pressure in the pres ll, shown here in fragmentary form. One con sure chamber 33 operates to move the diaphragm ventional switch embodiment comprises a pres l9 thus actuating the switch mechanism. The sure spring i2, which is held in position by means constructions now commonly on the market are such as a bolt l3, attached to the switch hous arranged in the above described manner. the ing i I. This bolt I3 is provided with a nut It opening or hole being only large enough to threaded on the bolt, and a washer or’ferrule re?ect a change in pressure rather slowly, but I5. The-tension of' the spring i2 is adjustable by threading the nut I4 up or down on the bolt IS. The spring l2 exerts downward pressure on one end of a rocker arm I 6, tending to resiliently bias the rocker arm to one position. This rocker arm is journaled at I‘! and is movable about the journal as an axis within the limits permitted by the other mechanism of the switch. A diaphragm plate or base [8 is provided with upwardly extending prongs 20 resting against the rocker arm IS. The pronged plate I8 is situated not being large enough to allow pulsations‘ from the pump or other vibration in the water system to move the diaphragm it suddenly or materially by changing the pressure in the pressure cham ber 30, and by vibrations cause ?ickering of the switch mechanism with consequent damage to the switch, and the other objections heretofore @ mentioned. In the past, the most serious objection to the arrangement above described has been that most water systems carry water with more or less mineral content such as lime, or carry corrosive on or attached to a diaphragm l9 and moves 60 water and the hole or opening in the bevel be therewith. In the ordinary construction of the switch the rocker arm I6 is bifurcated, and there are two upwardly extending prongs from the comes plugged and closed. If this should happen when the pump is running, a dangerous pressure would be built up in the system because the liq uid pressure in the pressure chamber 39 would The rocker arm It‘ is attached to a spring 65 not vary enough to move the diaphragm and cut member 22 which, in turn, engages a movable off the motor. ‘ arm 23. This movable arm 23 preferably is To remedy this situation, I provided means for pivoted on trunions 2e, and the opposite or free keeping the hole clear of closing obstructions, such end of the arm carries a contact point or points as the projecting member 34 shown in detail in 25. a 70 Figures 2 and 3. This member 34 is attached to In actual operation movement of the rocker the pressure chamber side of the diaphragm l9 arm 16 upwardly under pressure of the pronged and extends through the hole 35 in the ba?ie 33. pronged plate 18. plate I8 (or otherwise), shifts the direction of pressure on the spring 22, causing the movable arm 23 to move downward at its free end, sep Preferably this projecting member 34 is in the form of a wire long enough to extend to the hole 75 35 regardless of the position of the diaphragm 2,412,095 5 19 within the limits of normal operation. The projecting member 34 is preferably provided with the crimps, serrations, small undulations, wrin kles or the like, such as shown at 3B. These, in moving through the hole 35, serve to break loose scale or deposits tending to plug the hole 35, or to scrape the hole clean, whereby the ‘hole is maintained open at all times. A simple arrangement for attaching the pro 6 While I have herein shown and described cer tain features of my invention, still I do not wish to limit myself thereto, except as I may do so in the claims. I claim: 1. In combination with a switch having ?uid pressure actuated electrical contact means in cluding a movable diaphragm, baiile means be tween said pressure responsive means actuating jecting member 34 to the diaphragm I9 is pro 10 said electrical contact means, and a source of ?uid pressure, a hole in said baiiie means for the vided by the use of coils, as shown in Figure 3, passage of ?uid under the pressure therethrough, which may be fastened to the diaphragm by any said hole being restricted in size whereby the ?ow convenient'means such as by the retaining mem of fluid in response to pressure changes is re ber 31 preferably made of leather or fabric ma stricted, and means maintaining said hole open terial, metal or the like, and attached to the against clogging due to deposits of foreign ma diaphragm l9 in any convenient means such as terial, said means comprising a wire formed into by sewing, cementing or bradding. In the ar a spiral base, and a centrally extending crimped rangement shown the coils of the projecting portion, said base being secured to said dia member 34 ?t between the retaining member 31 phragm, and the crimped portion extending into 20 and the diaphragm l9, with the projecting por said hole and adapted to move with respect to tion containing the crimps 34, passing through said hole upon movement of said diaphragm. the retaining member 31. 2. In an electrical switch of the type actuated Obviously, burrs, serrated edges and the like by pressure transmitted through a movable dia would be effective instead of the crimps 36, and phragm, the improvement which comprises the are believed to be the equivalent of the crimps 25 combination of ba?ie means provided with a for the purposes herein described. surge-dampening ori?ce and a cleaning pin ex The member 34 may be made out of stainless tending through said ori?ce and attached to and steel, spring wire, or other suitable materials and movable with said diaphragm, said pin being of instead of the coils, may consist of a disc with sinuous contour so that foreign matter adhering a projecting member. While elimination of the 30 to the periphery of said ori?ce will be broken crimps 35 still presents an improved arrange ment over the devices now on the market, the preferred embodiment having the crimps seems superior. The ba?le 33 may be constructed of metal, Bakelite, or other material having sufficient strength to resist sudden changes in pressure away by the movements of said pin and so that there will always be an opening on at least one side of the pin, whereby permanent plugging of said ori?ce is rendered substantially impossible. 3. In a switch having movable fluid pressure responsive means and electrical contact means lactuated by said movable pressure responsive caused by pump vibrations, or the like, and means, the improvement which comprises bailie dampen such vibrations. means positioned between said pressure respon In the modi?ed construction shown in Figures 40 sive means and a source of fluid pressure, said 5 and 6 the switch mechanism is the same but means being provided with a hole for the pas I have provided a disc 33 which is preferably sage of ?uid under pressure, said hole being re made of light springy material such as a very stricted in size whereby the ?ow of ?uid in re light gauge spring steel. The disc takes the place sponse to pressure changes is retarded and re of the ba?ie 33 as will be clearly apparent from stricted, and cleaning means mounted upon and Figure 6. Said disc contains slits 39, which are carried by said movable means extending into preferably small and serve the purpose of the said hole for maintaining said hole open against hole 35. clogging due to deposits of foreign material, said In order to keep the slits 39 from closing" with 50 cleaning means being sinuous in form at such lime deposits, corrosion or the like, the diaphragm portions as extend into and through said hole, 19, which is separated from the disc by the an whereby said cleaning means may catch upon and nular ring 40, is caused to bear against the center break away foreign deposits tending to clog said portion of said disc by one or more lugs 4 l. These hole upon movement of said cleaning means rela lugs 4| may be either attached to the diaphragm tive to and axially of said hole. l9, or the disc 38, or both, whereby the move ll. In a ?uid pressure operated device having a ment of the diaphragm will distort the disc, caus pressure chamber at least a portion of one wall ing shearing action between the portions on op whereof is movable, means providing an ori?ce posite sides of the slits, which will serve to break for admitting and emitting ?uid under pressure the scale or deposits loose from the diaphragm for actuating said movable wall portion, and surface as well as the slits and keep the water cleaning means extending into said ori?ce and way open. movable axially thereof in response to movement The form of the invention herein shown and of said wall portion, said cleaning means com described presents a preferred embodiment prising a crimped rod, the movement of which thereof, and delineates its adaption to practical axially in said ori?ce acts to break away foreign use, but it is to be understood that the present matter and deposits and thereby to clean said disclosure is to be considered from the illustrative ori?ce. standpoint and not as imposing restriction or lim RICHARD W. MUERLE. itation on the invention.