US2076732A - Pump - Google Patents

Description

0. KUEHNE April 13, 1937.

PUMP

Filed June 29, 1934 Oscar [(uehn e INVEN TOR.

ATTORNEY.

Patented Apr. 13, 1937 UNITED STATES PATENT OFFICE 11 Claims.

This invention relates generally to pumps, and specifically to pumps for pumping abrasive or corrosive fluids.

It has for its general object the provision of new and improved means whereby the fluid is kept out of contact with the relatively movable parts of the pump, such as the piston, rods and bearings therefor.

A specific object of the invention is to provide a double acting pump so constructed that the use of stufling boxes and piston rods working.

therethrough is rendered unnecessary, and the fluid is efficiently prevented from entering between the piston and its bearing.

Other objects will hereinafter appear.

' The preferred embodiments of the invention are illustrated by the accompanying drawing, wherein Fig. l is a sectional elevation of the pump; Fig. 2, a diagrammatic top plan view of the plunger and reciprocating parts; Fig. 3, a detail view of the protective member, and Fig. 4, a detail view of another embodiment of the protective member.

The pump has a pair of chambers l and 2, the former having inlet and outlet valves 3 and 4, and the latter having inlet and outlet valves 5 and 6. Fluid enters the chambers and 2 through the inlet valves 3 and 5 from a common intake 1, and passes from the chambers and 2 through the outlet valves 4 and 6 into the common outlet 8. Reciprocable in the bearing 9 and extendin into the chambers and 2 is the piston In. On that end of the piston '|0 projecting into the chamber 2 is an elastic cup-shaped protective member having an external annular flange l2 sealed to the wall of the chamber 2 adjacent to the bearing 9 by the ring I3; and on that end of the piston l9 projecting into the chamber is a like protective member |4 having an external annular flange l5 sealed to the wall of the chamber adjacent to the bearing 9 by the ring The members II and H are at all times taut on the piston ID.

The piston I9 is reciprocated by the cross bars |1 (Fig. 2) connected thereto between the members II and I4 and extending outwardly through elongated openings l8 in bearing 9 to push rods l9 which are connected by the cross member 29 to the cross head 2|, the cross head 2| being actuated by conventional means. If desired, suitable guides 22 may be provided for the guidance of the push rods l9.

The operation of the pump is as follows: when the piston moves from the position shown tion, the inlet valve 5 closes, the outlet valve 6' opens, and the fluid in chamber 2 is expelled therefrom through outlet valve 6 and outlet 8. Simultaneously, the outlet valve 4 closes, the inlet valve 3 opens, and a fresh charge of fluid is drawn from inlet 1 through inlet valve 3 into chamber I.

When the piston I moves from its dotted line position into its solid line position, the inlet valve 3 closes, the outlet valve 4 opens, and the fluid in chamber I is expelled through outlet valve 4 and outlet 8. Simultaneously, the outlet valve 6 closes, the inlet valve opens, and a fresh charge of fluid is drawn from inlet I through inlet valve 5 into the chamber 2.

As the piston reciprocates the fluid is alternately drawn into and expelled from the chambers I and 2 in the manner above set forth.

It will be obvious that the use of conventional piston rods and their stufiing boxes, and the well known trouble incident thereto, are eliminated, and that the members II and I4 effectively prevent the entrance of foreign matter in the fluid between the piston lll and bearing 9, so that abrasion and corrosion of the piston .and its bearing are thereby prevented.

As the members H and 4 are elastic (preferably rubber) I they automatically expand and contract as the piston Ill reciprocates, remaining taut at all times thereon. As eachend of the piston I0 withdraws from its chamber, the friction between the periphery of the piston adjacent said end and the elastic member thereon incident to such withdrawal is reduced because such movement tends to create a vacuum in the chamber which has a tendency to pull the elastic member away from the same during such withdrawal, as indicated by dotted lines in Fig. 4.

The power required to operate the conventional plunger pump is excessive on account of the great amount of packing required to seal it, whereas in the present construction packings are eliminated.

The members II and I4 may be as shown by Fig. 3, or as shown by Fig. 4. In Fig. 3, the member 39 is substantially cup-shaped to receive the piston I9, and has the annular flange 3| adjacent its rim and projecting outwardly to be held in place against the wall 33 by the ring 32. In Fig. 4, the construction is the same, except that the bottom of the cup 34 is open as indicated at 35, but is held snugly in sealing engagement with the end of the piston by plate 36. The ring 32 may be held in place on the wall of the chamber by screws 31 and the plate 36 may be positively held in position to hold the bottom of the cup 34 snugly against the piston by suitable holdfast means 38.

5 Various advantages oi. the invention, changes in construction, and new uses other than as hereinabove set forth will be apparent to those skilled in the art.

I claim: 3 ['1] 1. A pump having a. pair 01' chambers; an in-' let valve and an outlet valve for each of said chambers; a bearing between said chambers; a piston reciprocable in said bearing and extending into said chambers; elastic cup-shaped mem- 15 bers sealed to the walls of said chambers and taut on and enclosing the ends of said pistons to seal said ends from said chambers; and reciprocating means extending into said bearing and connected to said piston between said members.

2. A pump having a pair of chambers; an inlet valve and an outlet valve for each of said chambers; a bearing between said chambers; a piston reciprocable in said bearing and extending into said chambers; means to seal the ends of said 25 piston from said chambers; and reciprocating means extending into said bearing and connected to said piston between said sealing means.

3. A pump having a pair of chambers; an inlet valve and an outlet valve for each of said 30 chambers; a bearing between said chambers; a piston movable in said bearing and extending into said chambers; means to seal the ends of said piston from saidchambers; and piston actuating means connected to said piston between 35 said sealing means.

4. A pump having a pair of chambers; an inlet valve and an outlet valve for each of said chambers; a bearing between said chambers; a piston reciprocable in said bearing and extending into 40 said chambers; means to seal the ends of said piston from said chambers; and reciprocating meansincluding a cross-head, a pair of push rods connected to said cross-head, and a pair of cross bars'connected to said push rods and extending into said bearing and connected to said piston between said sealing means.

5. A pump having a pair 01' chambers an inlet valve and an outlet valve for each of said chambers; a bearing between said chambers; a piston 60 reciprocable in said bearingland extending into said chambers; and an elastic cup-shaped member in each of said chambers, sealed to the wall of its chamber adjacent said bearing, enclosing the adjacent end of said piston, and being at all times taut on said piston.

55 6. A pump having a pair of chambers; an inlet valve and an outlet valve for each of said chambers; a bearing between said chambers; a piston reciprocable in said bearing and extending into said chambers; and an expansible cup-shaped member in each of said chambers, sealed to the wall 01' its chamber adjacent said bearing, enclosing the adjacent end of said piston, and being at all times taut on said piston.

7. A pump having a pair of chambers; an inlet valve and an outlet valve for each of said chambers; a bearing between said chambers; a piston reciprocable in said bearing and extending into said chambers; and an elastic member in each oi! said chambers sealed to the wall of its chamber adjacent said bearing, and sealed to and enclosing a portion of said piston, and being at all times taut on said piston.

8. A pump having a pairoi' chambers; an inlet valve and an outlet valve for each of said chambers; a bearing between said chambers; a piston reciprocable in said bearing and extending into said chambers; and an elastic member in each of said chambers and sealed to the wall of its chamber adjacent said bearing, and sealed to and enclosing'a portion of said piston.

9. A pump having a chamber; an inlet valve and an outlet valve for said chamber; a bearing adjacent one wall of said chamber; a piston reciprocable in said bearing and extending into said chamber; a substantially tubular elastic member having oppositely extending annular rim flanges sealed to the wall of said chamber adjacent said bearing and to said piston, said member extending over the end of said piston, and being at all times taut on said piston.

10. A pump having a chamber, an inlet valve and an outlet valve for said chamber, a bearing adjacent one wall of said chamber, a piston reciprocable in said bearingand extending into said chamber, and an elastic substantially tubular member having an external annular flange extending first radially then axially sealed to the wall of said chamber adjacent said bearing by a complemental oppositely extending ring and completely enclosing the end of said piston, and being at all times taut on said piston.

11. A pump having. a chamber; an inlet valve and an outlet valve for said chamber; a bearing adjacent one wall of said chamber; a piston reciprocable in said bearing and extending into said chamber; and an elastic substantially tubular member having an external annular flange extending first radially and then axially sealed to the wall of said chamber adjacent said hearing by a complementai oppositely extending ring and attached to and sealed to and enclosing a portion of said piston, said member being at all times taut on said piston.

OSCAR. KUEHNE.

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