Title:
Pump
United States Patent 2021156


Abstract:
The present invention relates to fluid pumps s and embodies, more specifically, an improved t pump by means of which fluid may be supplied under pressure from a source of power with loss of no fluid from the pumping chamber. It is well known that pumps, including air compressors and other forms...



Inventors:
Neil, Smith William
Application Number:
US69742033A
Publication Date:
11/19/1935
Filing Date:
11/10/1933
Assignee:
Neil, Smith William
Primary Class:
Other Classes:
92/42, 92/44, 417/244, 417/520
International Classes:
F04B39/10; F04B45/02
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Description:

The present invention relates to fluid pumps s and embodies, more specifically, an improved t pump by means of which fluid may be supplied under pressure from a source of power with loss of no fluid from the pumping chamber. It is well known that pumps, including air compressors and other forms of pumps of the present type necessarily have a certain amount of leakage between the relatively sliding elements thereof. These pumps therefore are preferably driven by a source of power which is of such character as to enable rapid movement of the movable pump element to take place in order that the individual pumping strokes may take place with a minimum 15' loss of fluid from the pumping chamber.

In order that a pump may be provided having a chamber from which no fluid can escape, the present invention has been designed and an object thereof is to provide a pump by means of which fluid may be supplied under pressure without loss of fluid or pressure from the pumping chamber.

A further object of the invention is to provide a fluid pump having means forming a fluid tight chamber, the volume of which may be varied by a suitable power source.

A further object of the invention is to provide a fluid pump having a bellows forming a pumping chamber and provided with means to actuate the bellows, the mechanism further being provided with bellows guiding and displacement members of such character as to enable substantially the entire contents of the bellows to be discharged during the pumping operation.

A further object of the invention is to provide an improved bellows pump of the double acting type wherein fluid is supplied under an initial pressure to the bellows or pumping chamber wherein further pressure is applied thereto. Further objects, not specifically enumerated above, will be apparent as the invention is described in connection with the accompanying drawings, wherein: Figure 1 is a view in section, taken through the axis of a pump constructed in accordance with the present invention and showing the bellows moved into an expanded position wherein the pumping chamber is of maximum volume.

Figure 2 is a view similar to Figure 1, showing the bellows moved into a collapsed or exhausted position at which time the contents have been discharged from the pump.

Figure 3 is a view similar to Figure 1, showing 55 a bellows pump of the double acting type contructed in accordance with the present invenbion.

Figure 4 is a view in section, taken on line 4-4 of Figure 3, and looking in the direction of the trrows. Figure 5 is a view in section, taken on line 5-5 of Figure 3, and looking in the direction of the amrows.

Referring to the construction shown in Figures 1 and 2, the pump is shown as being formed with a cylindrical guide or housing 10 having a cover I secured thereto in which a plunger 12 is slidably received. This plunger may be actuated by any suitable source of power and is secured to a movable head 13 which is slidably mounted within the guide 10. A stationary head 14 is secured to the opposite end of the guide 10 by means of screws 15 or other suitable mechanism and is formed with a hollow cylindrical central portion 16 within which a guide shaft 17 is received as will be described hereinafter. Between the movable and stationary heads 13 and 14 a flexible bellows 18 is secured, the bellows preferably being formed of rubber. The ends of the bellows are anchored to the heads by inserting the extremities thereof in a reentrant fashion into serrated annular grooves 19, the sectional annular wedge rings 20 being forced into the reentrant portions of the extremities of the bellows to force such portions against the adjacent serrated portions of the grooves in the heads.

To serve as a further sealing means between the heads and the ends of the bellows the adjacent sides of the heads are formed with annular recesses 21 into which the adjacent portions of the bellows are forced by means of clamping rings 22 which may be split or otherwisee formed and suitably secured over the grooves 21 in order that the material of the bellows may be forced thereinto. The bellows may be formed with a plurality of folds depending upon the volume desired for the pumping chamber and these folds are guided by means of outer positioning rings 23 and inner positioning discs 24. If desired, either or both of the discs and rings may be secured to the bellows at proper intervals, in the present construction, the inner discs being shown as secured thereto by annular clamping members 25 which are formed with inner ribs 26 which are adapted to force the material of the bellows into peripheral grooves 27, formed in the discs 24. Each of the discs 24 is preferably splined to the guide 1T by a key 28 which is adapted to engage a cooperating limiting stop 29, formed in the guide 17. The slots for each of the respective keys are of sufficient length to permit the several dii 24 to be moved along the guide 17 until each the discs is properly spaced when the bellows moved to the expanded position as shown Figure 1.

In like fashion, each of the guide rings 23 provided with a key 30 which is adapted to enga a cooperating limiting slot 3 , formed in the hou ing or guide 10. In this fashion, the position the rings 23 is properly maintained under all coi ditions of operation.

Apertures 32 and 33 are formed in the housir 10 and cover 1, respectively, while apertures and 35 are formed in the rings 23 and discs 24, r spectively. These apertures prevent the exis ence of undesirable pressure regions betwee portions of the pump mechanism during opers tion.

A suitable air inlet is provided at 36 and in cludes a one way valve 37 which permits air to b drawn into the bellows chamber through the duc and guideway 16 while preventing the flow of ai or other fluid in the opposite direction. A safet valve 39, communicating through duct 40 wit] the guideway 16, prevents the accumulation o a predetermined excessive pressure within th, bellows chamber, the fluid being discharged fron the pump through a suitable outlet 41 which, it the accompanying drawings, is shown as communicating with a reservoir 42 through a one wa3 valve 43.

In order that valves 39 and 43 may not stick and thus impair the operation of the mechanism the valve stems of the said valves are formed with extensions 38 which are adapted to be engaged Positively by the end of thd plunger 17. In the construction shown the end of the plunger 17 is provided with an enlarged flange 38' and a foot 38" which engage the extensions 38 and thus revent the valves from sticking.

The elements are assembled as shown in the drawings and the bellows thus provides a variable fluid tight chamber, all of the contents of which may be exhausted therefrom inasmuch as the discs 24 are formed of such size and shape as to occupy the entire interior of the bellows when it is moved to a collapsed position, as shown in Figure 2.

If desired, the discs 24 may be of less diameter than the maximum diameter of the bellows or the discs may be of full diameter inasmuch as the bellows is made of a flexible material, such as rubber.

In the construction shown in Figures 3, 4 and 5, the invention has been embodied in a double acting pump having the stationary and movable heads above described, together with the positioning and displacement discs and rings which are secured to the bellows, also as previously described. The cylindrical guide 100 is imperforate and the cover 101 thereof provided with one or more intake valves 102. As described in connection with the construction shown in Figures 1 and 2, a safety valve 39 is provided as well as a discharge duct 41. The plunger shaft is shown at 103 and is connected to the movable head in a suitable fashion in order that the movable head may serve as a positive means to compress the fluid between the cover 101 and the upper side of the movable head. The connection between the plunger guide 103 and the stationary head 101 is rendered fluid tight by a rubber stocking 04 which is secured between the adjacent serrated surfaces of a flange 105 formed on a cap, 06 and the surface of the cover 101. The flange 105 is ZU secured to the cover by means of screws 107 and cs the rubber stocking 104 is secured to the upper of extremity of the plunger guide 103 by means of a is wedge ring 108 which forces the adjacent end of in the stocking 104 into the serrated peripheral groove 109 formed in the upper extremity of the is guide 103. A serrated cap f10 is secured to the ge guide 103 by means of a screw I1 and a threaded s- extension 112 of the cap 110 has secured thereto a of power plunger 113. A cap 114 on the housing 106 n- slidably receives a plunger 113. The edges of the cap l10 are slotted at 115 to permit air to ig pass by the cap while the edges of the ring 108 14 are slotted at i6I for a similar purpose. - The fluid which is compressed within the chamt- ber above the movable head is forced into a duct *n il7 in the guide 103 which communicates with a - fitting 118 and a duct 119 which leads into the chamber formed by the expanded bellows. A one way valve 120 is provided in the inlet connece tion to prevent the back flow of fluid and the first :t stage of the compressing operation thus cornr prises the forcing of fluid from the chamber above Y the movable head into the chamber formed by the a expanded bellows. Movement of the head in the f opposite direction draws air into the first come pression chamber and at the same time addi1 tionally compresses the air within the second 1 compression chamber formed by the contracting - bellows. r The fitting 118 is received within a guide 121 which is secured to the movable head, the duct 119 being formed in this last named guide. The end of the guide 121 is formed with a foot 122 Swhich is adapted to engage the valve 41 to prevent sticking thereof, as previously described.

From the foregoing, it will be seen that a pump Shas been provided which functions fully regardless of the speed of operation thereof inasmuch as leakage from the compression chamber or chambers thereof does not take place. The pump is further characterized by relatively few moving parts and the parts which do move do not require particularly accurate machining operations for the manufacture thereof. Moreover, the ducts and valve between the several compression chambers are of simple and improved construction.

While the invention has been described with specific reference to the accompanying drawings, it is not to be limited, save as defined in the appended claims.

I claim as my invention: 1. A pump comprising an extensible and contractible fluid tight chamber forming means, means to actuate the chamber forming means, one way valve means to admit fluid into the chamber, a separate one way valve means to receive fluid from the chamber, air displacement and guiding means within the chamber to fill substantially the space therein when the chamber forming means is in contracted position, and means to guide and limit the movement of the displacement means.

2. A pump comprising an extensible and contractible fluid tight chamber forming means, means to actuate the chamber forming means, one way valve means to admit fluid into the chamber, a separate one way valve means to receive fluid from the chamber, air displacement and guiding means within the chamber to fill substantially the space therein when the chamber forming means is in contracted position, means to guide and limit the movement of the displacement means, guide means for the exterior of the chamber forming means, and means to guide and limit movement of the last named guide means.

3. A pump comprising a cylindrical housing, an extensible and contractible fluid tight chamber forming means in the housing, one way valve means to admit fluid into the chamber, a separate one way valve means to receive fluid from the chamber, air displacement means within the chamber to fill substantially the space therein when the chamber forming means is in contracted position, a guide shaft within the chamber upon which the displacement means is mounted, and annular -guide means within the housing and exterior to the chamber forming means.

4. A pump comprising an extensible and contractible fluid tight chamber forming means, a stationary head secured to one end of the chamber forming means, a movable head secured to the other end thereof, peripheral grooves formed in the heads and wedge rings to force the ends of the chamber forming means into the grooves.

5. A pump comprising a cylindrical housing, an extensible and contractible fluid tight rubber chamber forming means in the housing, a stationary head secured to one end of the chamber forming means, a movable head secured to the other end thereof, peripheral grooves formed in the heads, wedge rings to force the ends of the chamber forming means into the grooves and interior and exterior guide and displacement means in the housing cooperating with the chamber forming means.

6. A pump comprising an extensible and contractible fluid tight chamber forming means, means to actuate the chamber forming means, one way valve means to admit fluid into the chamber, a separate one way valve to receive fluid from the chamber, and means operated by the chamber forming actuating means to prevent certain of the valves from sticking.

WILLIAM NEIL SMITH.