US1389635A

US1389635A - Diaphragm-pump

Info

Publication number: US1389635A
Application number: US346862A
Authority: US
Inventors: Wesley E Dunkle
Original assignee: Individual
Current assignee: Individual
Priority date: 1919-12-23
Filing date: 1919-12-23
Publication date: 1921-09-06
Anticipated expiration: 1938-09-06

Description

W. E. DUNKLE.

DIAPHRAGM PUMP.

APPLICATION FILED M023, 1919.

1 {389,685 9 Patentefl Sept. 6, 1921.

no u o no:

you c A, can

ENVENTOR entree s'rarss west-m. E. numrma, or common, NEVADA.

DIAPHRAGM-YUM.

specification of Letters Patent.

Patented-Sept. s, 1921.

Application filed December 23,1919. Serial No. 346,862.

To all whom it may concern:

Be it known that I, WESLEY E. Domuls, a citizen of the United States, and resident of Contact, in the county of Elko and State of Nevada, have invented a new and useful Improvement in Diaphragm-Pumps; and I do hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to diaphragm pumps, and it has for its object to provide a pump of the character indicated in which. communication between the interior of the pump and the outer air is effectively provided, in which an annular diaphragm is alternately distended and collapsed by forcing fluid into and out of the diaphragm and in which these results are produced by a simple and effective arrangement of parts.

In the accompanying drawing, Figure 1 is a vertical sectional view showing a pump constructed in accordance with my invention with the piston at the limit of its outward movement; Fig. 2 is a vertical sectional view similar to Fig. 1 showing the piston at the 3 limit of its inward movement Fi 3 is a.

transverse sectional view of the same structure, the section being taken substantially along the line 3-3, Fig. 1; and Fig.4 isa vertical sectional view showing a modified form of plunger and diaphragm construcnon.

Referring first to Figs. 1 and 2 of the drawing, the pump therein shown comprises a cylinder or casing 2 provided with suitable valved inlet and outlet connections 3 and 42. The cover 5 of the cylinder 2 is provided with a central circular opening around which is disposed a tubular member 6 that extends into the casing and is provided with small perforations 7 upon its side walls and upon its closed inner end. A hollow plunger 8 provided with the usual expansive piston rings 9, is adapted to reciprocate within the tubular member 6 and is attached at its outer end to a cross-head 10.

Surrounding the tubular. member 6 is an annular diaphragm 11 of rubber or other flexible sheet material, the open end of which is securely attached by means of a band 12 or otherwise to the tubular member (5 near the cover 5. A second annular diaphragm 13 surrounds the plunger 8 outside of the casing 12, and has its ends attached, respectively, to the casing and to the plunger by means of bands 14: and 15.

The plunger 8 and the perforated tubular member 6 are filled with a liquid preferably an oil which is not injurious to the rubber or other material of which the diaphragms ll and-13 are composed. The amount of liquid is preferably such that when the plunger is withdrawn to the limit of its outward movement, as. shown in Fig. 1, the diaphragm 11 will not quite touch the tubular member 6.: The reciprocation ot'v the plunger 8 causes a small amount of oil to work up outside of the plunger and enter the space ,between the plunger and the outside diaphragm 13, and in order to permit such oil to reenter the plunger on the suction stroke of the pump, I provide

suitable check valves

16 and 17 in the plunger. The holes leading to these check valves are so small that the rubber diaphragm 13 will not be drawn into them. Th diaphragm may, if desired, be made with an insertion of cloth or other non-elastic sheet material opposite the valve ports, in order to prevent stretching and rubbing of the diaphragm at this point.

The modified device shown in Fig. 4. is similar in its general construction to the pump shown in Figs. 1, 2 and 3 and the corresponding parts are correspondingly numbored. In the device of Fig. 4, however, the tubular member'fi'is omitted and the plunger 8 reciprooates within an annular bearing 20 formed on or attached to the cover 5 of the casing 2, and extending either into the casing or above it, as desired. The plunger is provided with an inwardly extending portion 21 having lateral.perforations 22 and having its inner end closed, as shown at 23. An annular diaphragm 24 surrounds the inner portion 21 of the lunger and has its ends attached respective y to the bearing 20 and to the inner end of the plunger by means of

bands

25 and 26.

The operation or my diaphragm pump will be evident fro-tn an inspection of Figs.

1 and 2. When the plun or is moved into the cylinder, as shown in ig. 2, oil is forced through the perforations 7 and distends the diaphragm 11, thereby forcing the liquid that is being pumped through the outlet con- 7 except such as nection 4:. When the plunger is withdrawn the casing is effected by the plunger itself,

and not by the simple distention oi the inner diaphragm.

If it should happen that pumping conditions are such as to produce a greater pressure on the upper diaphragm than on the lower diaphragm, the oil in the upper space may eventually be forced past the plunger 1 into the lower space, which would leave the upper part of the plunger without lubrication. It may therefore be desirable to provide another check-valve 80 below the valves 1617 at a point that will come abovethe upper, edge of the casing at an intermediate point in the stroke, and to set this lower check valve to open on the pulsion stroke, so as to insure a circulation of oil. The port to this valve should be of less capacity than the ports draining the upper space through the valves l6l7.

My diaphragm pump is of special advantage in pumping liquids which are corrosive or gritty and which give off poisonous or otherwise injurious fumes which mi ht leak through ordinary pump packing. aching friction and air leakage at the gland is entirely eliminated in my device and the efiioiency of the pump is thereby increased.

While I have herein shown certain preferred embodiments of my invention, it is obvious that numerous changes in the construction and arrangement of parts may be made without departing from the pri ciples of my invention. I, therefore, desire hat no limitations be imposed on inve' areindicated in the appended claims.

What I claim is:

1. A pump comprising a reciprocahle plunger and a tubular, radially distensible working diaphragm surrounding the said plunger.

pump comprising a reciprocable plunger, a bearing therefor, and a tubular, radially distensible working diaphragm surrounding the said plunger.

3. A pump comprising a casing, a tubular diaphragm disposed therein, and means for intermittently and radially distending the diaphragm by forcing fluid thereinto. A pump comprising a casing, a plunger adapted to enter the said casing, and a fiexible radially distensible-Worlring diaphragm surrounding the said plunger within the said casin 5. .1 pump comprising a casing, a hollow fluid-filled plunger adapted to enter the said.

said "casing arid adapted to be distended whenthe said plunger moves into the said casi 6. pump comprising a casing, a plunger adapted to enter the said casing, and a lienihle radially distensible diaphragm surrounding the said plunger within-the said casing, the said diaphra m havingone of its ends attached to the sai casing.

7. A pump comprising a casing, a plunger adapted to enter the said casing, a flexible diaphragm disposed within the said casing and surrounding the said plunger, and a second flexible diaphragm surrounding the said plunger outside of the said casing.

S. A pump comprising a casing, a hollow,

liquid-filled plunger adapted to enter the said casing, a flexible diaphragm disposed within the said casing and surrounding the said plunger, a second flexible diaphragm surrounding the said plunger outside of the said casing and a cheek-valve in the said plunger permitting the entrance of liquid into the said plunger from the space inelcsed by the said outside diaphragm.

9. A pump comprising a casing, a plunger adapted to enter the said casing, and'a tubular' flexible diaphragm surrounding the said plunger within the said casing, the said diaphragm having one of its ends attached to the said casing and having its other end closed.

10. A pump-comprisin a casing, a periorated tubular member isposed therein, a plunger adapted to enter the said tubular member, and a flexible diaphragm surrounding the said tubular member.

11. A pump comprising a. casing, a perforated tubular member disposed therein, a liquid-filled plunger adapted to enter the said tuhuiar zuember, and a flexible diaphragm surrounding the said tubular member and adapted to be distended by-liquid forced by the said plunger through the perforations of: the said tubular member.

32. A pump comprising a casingf'a tubu- -lar member extending into the said casing surrounding the said tubular member,'the

said diaphragm havin one of its ends attached to the said tubular member and having its other end closed to surround the closed end 01': the said tubular member.

13. A pump comprising a casing, a tubular member extending into'the said casing and provided with a closed inner end and with perforations formed in its side and end walls, a hollow liquid-filled plun er adapted to reciprocate within the said tu ularmemher, a fielvible diaphragm surrounding the said tubular member, the said diaphragm having one of its ends attached to the said tubular member and having its other end liquid into the said plunger from the space closed to surround the closed end of the inclosed by the said outside diaphragm. 10 said tubular member, a second flexible In testimony whereof, I, the said WESLEY diaphragm surrounding the said plunger E. DUNKLE, have hereunto set my hand.

outside of the said casing, and having its WESLEY E. DUNKLE. ends secured respectively, to the said casing Witnesses:

and to the said plunger and a check-valve in FLORENCE H. DUNKLE,

the said plunger permitting the entrance of W. A. KENT.