US3313239A

US3313239A - Vane-type pump

Info

Publication number: US3313239A
Application number: US468466A
Authority: US
Inventors: Virgil A Brunson; Hoek Harold L Vanden
Original assignee: Dover Corp
Current assignee: Dover Corp
Priority date: 1965-06-30
Filing date: 1965-06-30
Publication date: 1967-04-11
Anticipated expiration: 1984-04-11

Description

Apri 11, 1967 v A, BRUNSON ETAL www@ VANE -TYPE PUMP Filed June 30, 1965 K. W? wwf my@ EHUL.. vmpm m Jv. Lw/ ll# VHWU fmmeys United States a'te'nt 3,313,239 VANE-TYPE PUMP Virgil A. Brunson and Harold L. Vanden Hoek, Grand Rapids, Mich., assignors to Dover Corporation, Grand Rapids, Mich., a corporation of Delaware Filed June 3l), 1965, Ser. No. 468,466 1 Claim. (Cl. 1113-136) The invention relates to a vane-type rotary pump having a novel type of replaceable liner.

When the body of a vane-type rotary pump is made of aluminum, as is often the case, it is necessary to employ a liner in the rotor chamber, in contact with the vanes. Aluminum is so soft that it would wear very rapidly if it were contacted by the rotating vanes. Aluminum surfaces can be hardened Iby various treatments, such as anodizing, but aluminum rotor chambers which have been subjected to such treatments have been found to be too abrasive so that they wear out the vanes too rapidly.

It is possible to use a sheet metal liner in a circular chamber, as shown in United States Patent No. 2,816,- 513, because a flexible sheet metal liner is easily bent into circular form so that it can be inserted into a circular chamber. However, the rotor chamber of an ordinary vane-type rotary pump is not circular, but is of varying radius, and it has not been possible to use a sheet metal liner in such a non-circular chamber, but it has been necessary to use a cast liner as shown in United States Patents Nos. 963,690 and 2,676,545. In a cast liner of the type heretofore used in vane-type rotary pumps, the interior of the liner is of varying radius to form the non-circular rotor chamber, and the exterior of the liner is of uniform radius so that it can be tted into a cavity of uniform radius in the pump body. Such a cast liner, which has an interior of varying radius and an exterior of uniform radius, is necessarily quite thick so that a vane-type rotary pump containing such a liner is relatively large and heavy.

The principal object of the invention is to provide a novel type of sheet metal -liner which can be used in a rotor chamber of varying radius in a vane-type rotary pump. More specific objects and advantages are apparent from the following description, in which reference is had to the accompanying drawings illustrating a preferred embodiment of the invention,

FIG. 1 is a side elevation Aof a pump embodying the invention, with a portion of the side plate broken away.

FIG. 2 shows the sheet metal liner of the pump in its initial flat condition.

FIG. 3 is an elevation showing the sheet metal liner rolled into helical form in preparation for insertion of the liner into the body of the pump,

These specific drawings and the specic description that follows are intended to disclose and illustrate and not to limit the invention.

The pump shown in the drawings comprises a housing 1t) to which a pair of side plates 11 are secured by means of screws 12. Mounted on each of the side plates 11 is a bearing 13 for supporting a shaft 14 by means of which the pump is driven. The interior of the housing consists of a bore 15 of varying radius in which is fitted a sheet metal yliner 16 that is provided with openings 17 as shown in FIG. 2.

The liner 16 is in the form of a non-rectangular parallelogram and preferably is made of a spring-stock material such as stainless steel, so that when removed from the pump the liner straightens out as shown in FIG. 2. In order that the liner may be inserted into the housing 10, the liner is rst manually bent into a helical shape as shown in FIG, 3. When the liner is in this helical form, it is of reduced circumference so that it can be inserted without difficulty into the non-circular bore 15 of the pump, -provided that one side plate 11 and the pump rotor have been removed. The area of the liner 16 is equal to the area of the surface of the bore 15, and when the liner is rolled into the shape shown in FIG. 3 and is inserted into the bore 15 so that it contacts the other side plate 11 which is still in place, one corner of the liner 16 will protrude from the open end of the bore 15. This protruding corner of the liner 16 is then tapped inward with a hammer, so that the wedging action of the butting ends of the liner 16 causes the liner to expand until it is exactiy coextensive with and tightly in contact with the non-circular bore 15. This method of expanding the liner 16 into Contact with the bore 15 is necessary because the rolled-up liner tends to maintain a circular shape and a considerable amount of force is required to distort the liner into conformity with the non-circular bore 15.

Since the rolled-up liner tends to maintain a circular shape, the distortion of the liner caused by expanding it into contact with the non-circular bore 15 produces a iirm grip between the liner and the bore which prevents the liner from being displaced after it has once been inserted.

The space inside the liner 16 constitutes a rotor chamber 18, in which is located a circular cylindrical rotor 19, xed upon the drive shaft 14. As shown in FIG. 1, the upper portion of the chamber 18, consisting of approximately 1/s of the periphery of the chamber, fits closely around the periphery of the rotor 19. Thus the upper portion of the chamber 13 is concentric with the axis of the shaft 14. The lower 1/6 of the chamber 18 also is concentric with the axis of the shaft 14, but at a larger radius.

The housing 141 is provided with an outlet port 20, and a diametrically opposed inlet port (not shown). When the sheet metal liner 16 is being inserted, care is taken to `locate the openings 17 in substantial registry with the inlet `and outlet ports in the housing 10,- so asto place these ports in communication with the Irotor chamber 1S.`

Each lof six vanes 21 has a sliding fit in a radial slot 22 provided in the rotor 19. Three rods 23 are slidably mounted in three spaced holes which 'are drilled through the rotor 19 and the shaft 14, to connect each pair of diametrically opposed vanes 21.

During operation of the pump the vanes 21 are held outward by centrifugal force and wipe around the periphery of the rotor chamber 18. As each vane traverses the upper 1/6 of the chamber 18, it remains substantially stationary relative to the rotor, in its innermost position. Then as the vane travels downward across the inlet port, it moves radially outward relative to the rotor while continuing to wipe against the periphery of the chamber 18 and `pushing liquid ahead of it. As each vane travels across the lower 1/6 of the chamber 18, it remains stationary relative to the rotor 19, in its outermost position. Then as the vane travels upward across the outlet port 20, the vane moves back to its innermost position.

The rods 23 supplement the laction of centrifugal force, particularly during start-up of the pump, in holding the vanesoutward to cause them to wipe around the periphery of the chamber 1S.

A shallow groove 24 is provided on the front surface of each vane to permit liquid to flow inward past the vane as the vane is moving radially outward relative to the rotor 19, so as to prevent the formation of a vacuum at 25 that would impede the outward movement of the vane.

Having described the invention, we claim:

A vane-type rotary pump comprising, in combination, a rotor chamber having a side wall of varying radius in which is formed an inlet, and an outlet angularly displaced from the inlet, a rotor eccentrically mounted in the cham ber, having radial slots and vanes radially movable in the slots, yand a sheet metal liner for the chamber which when flat is in the form of a non-rectangular parallelogram, having openings for registry with the inlet and outlet, the liner being exible and `resilient .and tending to straighten out so that when its ends are brought into offset butting relationship the liner takes the form of a helix which can be inserted into the chamber, the butting ends extending at such an angle that a wedging action to expand the helix is produced by tapping the protruding end of the helix into place, and the yliner when in place sing coextensive with the side wall of the chamber and being,y distorted, .by the Wedging action of the butting ends, into intimate contact with the side wal] of varying radius, thereby locking the liner in place References Cited by the Examiner UNITED STATES PATENTS 963,690 7/1910 Curtis 103-136 1,395,"-)l 11/1921 Hayes 103-136 2,283,424 5/1942 Colwell et al 29-156.4 2,676,545 4/1954 Barr 103--216 2,816,513 12/1957 Watson 103-216 3,202,103 8/l965 Sully 103-136 DONLEY I. STOCKING, Primary Examiner.

MARK NEWMAN, WILBUR I. GOODLIN, Examiners.

R. M. VARGO, Assistant Examiner`