US3476051A - Liquid pumps - Google Patents

Description

Nov. 4, 1969 v R. 'r. J. SKINNER 3,476,051

LIQUID PUMPS Filed Dec. 19, 1967 ATTORNEYS United States Patent US. Cl. 103-5 3 Claims ABSTRACT OF THE DISCLOSURE A liquid pump comprises a body having a pumping cavlty containing a rotor, the cavity having at least one outlet and, in an inlet plate, at least one inlet port disposed at or near the rotor periphery, the opposite side of the rotor having a channel formed by an annular piston.

This invention relates to liquid pumps of the kind comprising a body having a cavity in which is disposed a bladed rotor, the cavity having an inlet and an outlet.

The object of the invention is to provide a liquid pump of the kind referred to in a convenient form.

In accordance with the present invention a liquid pump comprises a body, having a pumping cavity and at least one outlet therefrom, a bladed rotor mounted within the cavity, an inlet plate at least in part forming one side wall of the cavity, at least one inlet port in the inlet plate, said inlet port being disposed at or near the periphery of the rotor, the opposite side wall of the cavity having means for defining a channel in the side of the cavity adjacent to the rotor periphery and extending between the position of said inlet and that of said outlet.

The invention will now be described by way of example with reference to the accompanying drawing in which;

FIGURE 1 illustrates, in cross-section, a pump constructed in accordance with the invention, and

FIGURE 2 is a developed part section, on the rotor circumference.

The pump comprises a body in which is defined a substantially cylindrical cavity 11 containing a bladed rotor 12, there being, in the wall of the cavity 11, a pair of tangentially disposed outlets 13 (only one being shown).

The rotor 12 is mounted upon a shaft 14 arranged to be driven by associated apparatus such as an engine to which the pump is intended to supply fuel, there being a bearing structure indicated generally at 15 for supporting the shaft 14 in the body 10.

Adjacent to one side of the rotor 12 and at least in part forming one side wall of the cavity, is an inlet plate 16 secured in the body 10, this inlet plate having a pair of inclined and tapering passages 17 communicating with the pumping cavity 11 through ports 18. The ports 18 are disposed at or near the periphery of the rotor 12 as illusstrated. The passages 17 are supplied with liquid to be pumped from an inlet 19 formed in a part 20 secured by bolts 21 to the body 10. Flow of liquid from the inlet 19 to the passage 17 in the inlet plate 16 takes place through a further bladed rotor 22 which is also mounted upon the shaft 14 for rotation with the rotor 12. The rotor 22 serves as a primary pump and this is a substantially conventional form of centrifugal pump, the inlet thereto being near the centre 'of rotation directly from the inlet 19, and delivery therefrom being at the outer periphery of the rotor 22 to the passages 17 in the inlet plate 16.

At the opposite side of the rotor 12 from the inlet plate 16 is provided an annular piston 23 which is movable axially with respect to the rotor 12, the crown of the piston 23 defining the base of an annular channel 24 divided into two portions by a pair of fixed abutments 25. The piston 23 is spring loaded away from the rotor by springs 3,476,051 Patented Nov. 4, 1969 mounted within the abutments 25, as seen in both figures of the drawings.

The piston 23 is however adjustable so as to define a greater or lesser depth of side channel 24. The two portions of the channel extend respectively between the position of an inlet port 18 and that of the associated outlet 13. In an alternative form, however, only one inlet port 18 and outlet 13 are provided, and one abutment 25. In this form the inlet port and outlet are at opposite sides of the abutment respectively.

Having thus described my invention what I claim as new ice and desire to secure by Letters Patent is:

, the cylindrical wall thereof, a bladed rotor mounted within the cavity, an inlet plate forming at least part of one side wall of the cavity, at least one inlet port in the inlet plate, said inlet port being disposed near the rotor periphery and spaced circumferentially from the outlet, an inlet in the body with which the inlet port communicates, a channel in the side of the cavity remote from the inlet plate, said channel being disposed adjacent to the rotor periphery and extending between the position of the inlet and that of the outlet around the cavity, abutment means defining the ends of the channel, a piston mounted in the body to form the base wall of the channel, and means resiliently supporting the piston whereby the piston is movable towards and away from the rotor to vary the volume of the channel on the operation of the pump.

2. A liquid pump comprising a body, a generally cylindrical pumping cavity defined within the body, two outlets in the body communicating with said cavity through the cylindrical wall thereof at spaced positions, a bladed rotor mounted within the cavity, an inlet plate forming at least part of one side wall of the cavity, two inlet ports in the inlet plate, said inlet ports being disposed near the rotor periphery and spaced circumferentially from the outlets respectively, an inlet in the body with which the inlet ports communicate, two channels in the side of the cavity remote from the inlet plate, said channels being disposed adjacent to the rotor periphery and extending respectively between the position of an inlet and that of an outlet around the cavity, a pair of abutments defining the ends of the channels respectively, an annular piston mounted in the body to form the base walls of the two channels, and means resiliently supporting the piston whereby the piston is movable towards and away from the rotor to vary the volumes of the channels on the operation of the pump.

3. A liquid pump as claimed in claim 1 in which the body has a further chamber between the inlet plate and the inlet in the body, and a primary centrifugal type pump impeller rotatably mounted in said further chamber, and a drive shaft connected to said impeller and to the rotor of the pump.

References Cited UNITED STATES PATENTS 916,427 3/ 1909 Fee 103-97 1,979,621 11/1934 Hollander 103-96 2,073,014 3/1937 Jennings 103-96 2,875,698 3/1959 Roth 103-105 3,002,463 10/ 1961 Lahti 103-96 3,252,421 5/1966 Luhmann 103-96 FOREIGN PATENTS 871,494 3/ 1953 Germany.

HENRY F. RADUAZO, Primary Examiner US. Cl. X.R. 103-2, 96, 97, 105

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