US3467021A

US3467021A - Fluid pressure operated pump

Info

Publication number: US3467021A
Application number: US704737A
Authority: US
Inventors: Robert F Green Jr
Original assignee: MEC O MATIC Inc
Current assignee: MEC O MATIC Inc
Priority date: 1968-02-12
Filing date: 1968-02-12
Publication date: 1969-09-16
Anticipated expiration: 1986-09-16

Description

P 6, 1969 R. F. GREEN, JR

FLUID PRESSURE OPERATED PUMP 3 Sheets-Sheet 1 Filed Feb. 12, 1968 FIG. 2

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P 6, 1969 R. F. GREEN, JR

FLUID PRESSURE OPERATED PUMP s Sheets-Shet 2 Filed Feb. 12, 1968 m/ INVENTOR ROBEEQ T F. GREEN Jr.

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United States Patent M US. Cl. 103-152 7 Claims ABSTRACT OF THE DISCLOSURE A fluid pressure actuated pump includes a pair of flexible diaphragms with a plunger extending through the pressure actuated diaphragm and secured at one end to the pumping diaphragm. A further chamber communicates with the fluid pressure chamber and an outlet extending from the further chamber to a position below the pump. A spool is slidably mounted on the other end of the plunger and has a valve thereon for controlling the flow of fluid under pressure from the pressure chamber to the outlet and bearing against a coil spring extending between the spool and the other end of the plunger so that as fluid under pressure flows past the valve to fill the outlet, suction pressure is created thereby to cause the spool to slide in the direction to seat the valve and permit the fluid pressure to flex the diaphragms in one direction against the coil spring pressure and which now forces the spool to slide in the opposite direction to open the valve and release the fluid in the outlet and in the pressure chamber to cause the diaphragms to flex in the opposite direction.

This invention relates to pumps and is more particularly directed to a fluid pressure operated pump utilizing both fluid and atmospheric pressures.

A principal object of the present invention is to provide a pump using fluid power and atmospheric pressure as the power source of the pump.

Another object of the present invention is to provide a chemical pump that uses the ordinary domestic water supply as its motive power without the usual intricate valve system for controlling the fluid pressure.

A further object of the present invention is to provide a chemical pump using Water pressure as well as atmospheric pressure for pumping a liquid chemical and discharging it approximately the same pressure as that of the water used as the motive power.

A still further object of the present invention is to provide a pump utilizing water and atmospheric pressures for actuating the pump and which is simple in construction and design and most effective in operation.

With these and other objects in view, the invention will be best understood from a consideration of the following detailed description taken in connection with the accompanying drawings froming a part of this specification, with the understanding, however, that the invention is not confined to any strict conformity with the showing of the drawings but may be changed or modified so long as such changes or modifications mark no material departure from the salient features of the invention as expressed in the appended claims.

In the drawings:

FIGURE 1 is a perspective View of a pump utilizing fluid pressure and atmospheric pressure as its source of power.

FIGURE 2 is a cross sectional view taken at the center of the pump with the various parts shown in their neutral or starting position.

FIGURES 3 to 6 inclusive are similar views showing the position of the various parts thereof in a single cycle of operation of its pumping action.

3,467,021 Patented Sept. 16, 1969 Referring to the drawings wherein like numerals are used to designate similar parts throughout the several views, the numeral 10 refers to my fluid operated pump 10 consisting of a plurality of

blocks

11, 12, 13 and 14 secured together by screw bolts as shown to form a small, compact yet efficient device for pumping chemicals by use of water pressure. The

blocks

11, 12, 13 and 14 have been bored to form cavities therein, block 11 having a relatively large diameter cavity 16 joined by a smaller concentric bore 15 of greater depth, which in turn communicates with a cavity of slightly smaller bore 27 to form a shoulder 28 therebetween. At the juncture of

cavities

15 and 16, the block 11 is bevelled as at 29, whose function is explained in detail hereinafter. The cavity 27 communicates with a duct 17 to which is connected a water outlet tubing 30 that extends for a distance of at least five feet below the pump 10 since atmospheric pressure is utilized in the proper operation of the pump.

The clamping block 12 is provided with a cavity 18 that extends through the full depth of the block 12 and is approximately equal in diameter to that of the cavity 16. Communicating with the cavity 18 in the block 12 is a cavity 19 of smaller diameter formed in the block 13. The end block 14 is provided with a cavity 20 of equal diameter to that of the cavity 19.

Ducts

21 and 22 connect the cavity 20 with a chemical feed inlet tubing 31 and outlet tubing 32 respectively. The cavity 16 of the block 11 communicates with a duct 23 to which a water pressure inlet tubing 33 is connected.

Between blocks 11 and 12 is a flexible diaphragm 24 secured therebetween at its peripheral portion and provided with a centrally disposed opening 34 through which extends a stem 35 of a plunger P. Secured to one side of the flexible diaphragm 24 is an inflexible member 25 also provided with a bore concentric with the bore 34. The plunger P has an enlarged portion 36 which forms a shoulder 37 that engages the inflexible member 25, the end of the plunger P being provided with a head portion 38 which bears against and is secured to a flexible diaphragm 26 that is itself clamped between the

blocks

13 and 14.

Slidably mounted on the stem 35 of the plunger P is a spool 40 that is provided with a shoulder 41 adapted to engage the shoulder 28 between the cavities 15 and 27. At one end of the spool 40 is a peripheral groove 42 in which an O-ring 43 is positioned. At the other end of the spool 40 is a concentric slot 44 in which a packing or sea] 45 is maintained by a washer 46 to prevent leak age of fluid past the stem 35. Extending between the washer 46 and a second washer 47 secured to the end of the stem 35 is a coil spring 48 yieldingly urging the

washers

46 and 47 in a direction away from each other. Interposed between the flexible diaphragm 24 and the spool 40 is a spacer block 50 which is mounted on the plunger shaft 35, the diaphragm 24 being interposed between the

rigid blocks

25 and 50. Mounted on the

tubing

31 and 32 are

check valves

51 and 52 respectively, the check valve 51 permitting the flow of fluid one way from a source (not shown) through the tubing 31, duct 21 and chamber 20 and the check valve 52 permitting the flow of fluid from the chamber 20, through duct 22, and tubing 32 to a point of discharge (not shown).

In the normal operation of my fluid operated pump 10, the inlet tubing 33 is connected to a source of fluid under pressure, as for example water from the usual domestic water supply system which has its water flowing at approximately 30 pounds pressure. The waste tubing 30 should extend downwardly from the pump 10' and so oriented that its discharge end is open and approximately five feet below the pump 10 so that when the line 30 is filled and Water captured therein as explained in detail hereinafter, a suction effect is created in the cylinder 15 equivalent to 4.41" Hg which is equal to 2.16 p.s.i. of negative pressure. The tubing 31 is connected to a source of fluid to be pumped by pump and the tubing 32 connected to a point of discharge for the fluid being pumped.

When water under pressure is permitted to flow into the tubing 33, with the various parts of the pump 10 in their neutral position, as shown by FIGURE 2, the water will flow through the duct 23 and enter the chamber 16, and leave the chamber 16 by flowing past the O-ring of the spool 40, the bevelled surface 29 and into the chambers and 27. The water continues to flow through the duct 17 and into the waste tube 30. When the waste tube 30 has filled with water and is beginning to discharge therefrom, the suction created causes the spool 40 to slide inwardly along the stem 35 into the cylinder 15 partly cornpressing the coil spring 48. Since the coil spring 48 bears against the head washer 47, the spring force causes the plunger P to slide inwardly carrying with it the rigid member and flexible diaphragm 24 as well as the flexible or pumping diaphragm 26. As a result of this action, the movement of the flexible diaphragm 26 outwardly of the chamber 20 from the position shown by FIGURE 2 to the position shown by FIGURE 3, fluid or chemicals will be drawn into the chamber 20 via the inlet tubing 31 past the check valve 51 and through the duct 21.

When the O-ring 43 engages the bevelled surface 29 at the mouth of the cavity 15, as shown by FIGURE 3, the flow of water from the chamber 16 to the chamber 15 is cut off. The column of water in the waste tube 30 is now established and the water in the chambers 15 and 27 and the duct 17 and waste tubing 30 is retained therein. The suction efIect created by the water retained in the waste tube 30 continues the movement of the spool 40 inwardly of the chamber 15 until the shoulder 41 of the spool 40 engages the shoulder 28 at the end of the chamber 15. During this time water pressure caused by the retention of the water in the chamber 16 will bear against the flexible diaphragm 24 and cause it to flex outwardly from the position shown by FIGURE 3 to that shown by FIGURE 4. At the same time the pumping diaphragm 26 has been flexed inwardly of the chamber 20 to discharge the fluid therein through the duct 22, tubing 32 and check valve 52. This pumping action is continued as the coil spring arrives at its completely compressed condition and becomes in effect a solid cylinder or tube about the stem 35 and interposed between the

washers

47 and 46 as shown by FIGURE 5.

The full force being exerted by the water pressure in the chamber 16 on the flexible diaphragm 24 is now transmitted by the rigid member 25 to the stem 35 and spring 48 to slide the spool outwardly of the cavity 15 simultaneously with the outward movement of the plunger P. The pumping diaphragm 26 is now flexed to its extreme inward position as shown by FIGURE 6 and the chamber 20 is evacuated of its contents through the discharge tubing 32.

When the spool 40 has moved to the position shown by FIGURE 6 and the O-ring 43 arrived at the position of the bevelled surface 29, water contained in the chamber 16 will commence to flow into the cavity 15 releasing the pressure against the flexible diaphragm 24. The water contained in the waste pipe 30 will now be discharged as the suction effect previously caused by the captivated water therein is now dissipated and no longer is present. The coil spring 48 will now exert its force against both

washers

47 and 46 to cause the plunger P to slide outwardly of the chamber 19 as the spool 40 continues to slide into the chamber 16 to the position shown by FIG- URE 2. At this time the pumping diaphragm 26 becomes flexed outwardly of the chamber 19 to draw in fluid or chemical through its inlet tubing 31. The cycle of operation of my pump 10 is now completed and the pumping action is continued as the cycle of operation is repeated. It is to be noted that the size of the spool 40 and the strength of the coil spring 48 are such that the suction 4 pressure created by the column of water in the waste pipe 30 is adequate to overcome the spring pressure 48.

What I claim as new is:

1. A fluid pressure operated pump comprising a body member, a fluid pressure actuated diaphragm and a pumping diaphragm mounted in said body member, said diaphragms having a first and second chamber contiguous with said diaphragms respectively, a third chamber communicating with both of said diaphragms, and a fourth chamber communicating with said first chamber, said first and second chambers having an inlet and an outlet, said outlet of said first chamber extending from said fourth chamber to a position below said body member, said fluid pressure actuated diaphragm having an opening, a plunger mounted in said first chamber, extending into said fourth chamber and through said opening in said fluid pressure actuated diaphragm and engaging said pumping diaphragm at one end, a spool slidably mounted on said plunger at the other end and positioned in said first and fourth chambers, valve means mounted on said spool controlling the flowing of fluid from said first chamber to said fourth chamber and spring means extending between said spool and said plunger at said other end, said spring means yieldingly urging said valve means in a direction permitting the flow of fluid under pressure from said first chamber to said fourth chamber to be discharged through said outlet positioned below said body member whereby upon the flow of fluid under pressure into said first chamber, past said valve means into said fourth chamber and fills said outlet positioned below said body member, the suction created by said head of fluid in said last named outlet causing said spool to slide in a direction against said spring pressure and seat said valve means to commence the reciprocal movement of said plunger and the pumping action of said pumping diaphragm.

2. The structure as recited by claim 1 wherein said fourth chamber is provided with stop means limiting the sliding of said spool into said fourth chamber and compress said coil spring.

3. The structure as recited by claim 2 wherein said fluid under pressure captured in said first chamber flexes said fluid pressure actuated diaphragm outwardly of said first chamber causing said spool and said plunger to slide outwardly of said first and fourth chambers and said pumping diaphragm to be flexed inwardly of said third chamber and continue the pumping action thereof.

4. The structure as recited by claim 3 wherein upon the completion of said pumping action of said pumping diaphragm in said one direction, said valve means is brought to its open position and said fluid under pressure is permitted to flow into said fourth chamber and be discharged through said outlet whereby said fluid pressure actuated diaphragm is flexed inwardly of said first chamber by said coil spring to continue the pumping action.

5. A fluid operated pump comprising a plurality of block members, a pressure actuated and pumping flexible diaphragms in side by side relation engaged at their peripheral portion by said block members, said block membershaving a chamber on each side of said diaphragms, namely pressure chamber, pumping chamber and adjacent chambers, said adjacent chambers being in communication with each other, a further chamber communicating with said pressure chamber and said pressure actuated diaphragm, a fluid inlet and outlet connected to said pumping chamber of said pumping diaphragm, an inlet duct connected to said pressure chamber of said pressure actuated diaphragm, an outlet duct connected to said further chamber and extending below said block members, said pressure actuated diaphragm having an opening, a plunger mounted in said pressure chamber of said pressure actuated diaphragm, extending into said further chamber and into said adjacent chamber of said pumping diaphragm, one end of said plunger being secured to said pumping diaphragm, a spool slidably mounted on said plunger and extending into said further chamber and said pressure chamber of said pressure actuated diaphragm, a coil spring mounted on said plunger and extending between said other end of said plunger and said spool, valve means mounted at said end of said spool in said further chamber to permit the flow of fluid under pressure into said further chamber and said outlet, said further chamber having side walls forming a valve seat whereby upon the sliding of said spool into said further chamber, said valve means becomes seated to prevent the further flow of fluid under pressure into said further chamber and thereby retain the fluid in said outlet and effect suction pressure on said plunger and said spool.

6. The structure as recited by claim 5 taken in combination with shoulder means in said further chamber and said spool limiting the sliding movement of said spool into said further chamber and the compression of said coil spring whereby upon the filling of said pressure chamber of said pressure actuated diaphragm with fluid under pressure, said last named diaphragm will flex outwardly causing said plunger and said spool to slide in the direction away from said further chamber and said pumping diaphragm becoming flexed inwardly of said pumping chamber to pump fluid from said pumping chamber.

7. The structure as recited by claim 6 whereby upon the sliding of said valve means into said pressure chamber of said pressure actuated diaphragm, said valve means opens releasing the pressure of the fluid in the pressure chamber and the suction effect of the fluid in said outlet and said coil spring causes said plunger to slide inwardly of said other chamber and said pumping diaphragm to be flexed outwardly of the pumping chamber to pump fluid into said pumping chamber and continue the pumping action of said plunger.

References Cited UNITED STATES PATENTS 514,608 2/1894 Weatherhead 230162 2,307,566 l/1943 Browne 103-152 ROBERT M. WALKER, Primary Examiner