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US 4,382,752 AGranted
Twin-cylinder pump, in particular for pumping thick liquids
OwnerKarl Schlechtinventor
Life of this patent
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OwnerKarl Schlechtinventor
Estimating the term…
In pumps for viscous substances, particularly pumps for concrete, with two feed cylinders (2) opening out into a hopper (1), which cylinders (2) alternately draw the material to be forwarded from the hopper (1) and press it via a swingable S-shaped tube (5), arranged within the hopper (1), into a delivery pipe, the swivel bearing is constructed in such a way that the pressure of the material to be forwarded is changed into an axial thrust force on the axially movably arranged swivel tube (5) whereby the contact pressure of a wear ring (20) is increased, to ensure a sealing abutment of the wear ring attached to the end of the swivel tube with the rear wall (44) of the hopper (1) including the outlets of the feed cylinders, which wall (44) may if necessary, be reinforced with a spacer (22), and to ensure uniform wear over the whole face of the wear ring (20). Uniform wear of the wear ring (20) over the whole of its face is additionally effected in that the wear ring (20) is rotatably mounted on the end of the swivel tube (5).
A piston pump particularly intended for the delivery of viscous substances such as concrete, comprising a hopper having a rear wall and an opposite front wall, two feed cylinders disposed in laterally spaced parallel relation and opening through said rear wall into said hopper, a delivery pipe in communication with said hopper through said front wall thereof, an S-shaped swivel tube located within said hopper and having an inlet end and an outlet end with said outlet end opening into said delivery pipe and said inlet end being swivelably movable alternately between said feed cylinders, a bearing bush surrounding the outlet end of said swivel tube and fixed thereto, a wear ring positioned in sealed contact with said inlet end of said swivel tube and arranged in sliding contact with said rear wall, the outside diameter of said bearing bush is larger than the effective sealing diameter of said wear ring at the inlet end of said swivel tube in contact with said rear wall, and a resilient element located between the outlet end of said swivel tube and said delivery pipe, a pressure sleeve laterally encircling said resilient element, and said resilient element is exposed to the conveying pressure acting in said swivel tube.
A piston pump, as set forth in claim 20, wherein said wear ring has an annular shoulder thereon facing toward the outlet end of said swivel tube, and a sealing ring arranged between said annular shoulder on said wear ring and the inlet end of said swivel tube.
Dependencies are inferred from the claim text.