GB2120323A - Positive-displacement rotary pump - Google Patents

Abstract

A pump for a liquid e.g. water, or concrete mixture comprises a stationary hinged vane, or "plate", E with a free edge at its leading end riding continuously on the undulating peripheral surface of a rotor D, the pivot axis of the plate and the rotation axis of the rotor being mutually parallel. The plate may be biased by a tension spring located externally of the working chamber. <IMAGE>

Description

SPECIFICATION Positive displacement rotary pump The pump has been devised for the purpose of transfer of materials which are in, or can be put in, a state of liquefaction. A prototype proved to be capable of handling liquids of a wide viscosity range from water to concrete mixture. The dimensions and materials of construction, i.e.

metals and/or plastics, will depend on the required application of a given unit.

The pump Fig. 1 consists of a cylinder in which two impellent constituents operate, one constituent revolving and the other oscillating, Fig. IV 'D' and 'E' respectively.

The revolving constituent 'D' Fig. IV is in the form of a cam on a driving spindle extending through a bearing, seal housing or stuffing box and gland in the top cover of the cylinder and beneath the cam to the lower bearing in the bottom of the cylinder. The cam is of a particular shape-peripheral- the extreme dimensions matching the diameter and depth of the cylinder with appropriate clearance. The dimensions of the cam are governed by considerations of strength of construction material and the achievement of maximum swept volume.

The oscillating constituent Fig. IV 'E' is a hinged plate of which the leading edge on the other end from the hinge rides on the peripheral surface of the cam and is shaped to conform with the configuration of the cam. The leading edge of the hinged plate is in continuous contact with the peripheral sufface of the cam while oscillating in operation.

The direction of rotation of the cam must be so that the hinged plate ridihg edge must lead on the cam periphery as opposed to trailing.

The cylinder is in two parts-the body and the top cover. The bottom is integral with the cylinder wall and carries the lower bearings for the cam spindle and the hinged plate spindle. The top of the cylinder is flanged and carries studs which fasten the spigotted cover to the cylinder with nuts. The cover carries the upper bearings for the hinged plate spindle and the cam spindle together with the seal housing.

The depth of the cylinder of the prototype was one quarter of the diameter but this ratio is not critical and may be varied according to requirement. There are inlet and discharge ports in the cylinder wall so positioned to obtain maximum swept volume. For submersible usage in handling material of very low viscosity the induction port should have the maximum area of opening possible, extending down the cylinder wall and across the bottom to within an acceptable distance of the bearing boss to minimise cavitation of the material to be transferrdd. For surface service using a suction pipe the two ports may be similar. Fig. II 'C'.

The unit will induct and discharge in two cycles per revolution. The inlet port will be open to a subsequent induction before the previous discharge on the other side of the cam has been completed thus ensuring minimum pulsation.

Where a pump is required to operate on a surface position drawing e.g from a sump and the running control is by a liquid level control mechanism and without personnel in attendance, it is advisable to fit a spring arrangement, Fig. I 'B' the spring is attached to a lever fitted to the top of the hinged plate spindle, which, in this case, would be extended above the cylinder cover. This keeps the hinged plate leading edge firmly in contact with the cam and eliminates the possibility of the pump having to be primed when operating at higher speeds while pumping liquids of high viscosity.

The coupling, Fig. I 'A' need not be of the type shown.

This type of pump will be useful in the following industries: Food Building Mines/Quarries Sewage Oil-e.g. as an 'in-line' accelerator in lone over-land pipe lines.

Agriculture-already successfully used pumping slurry from cattle slatted court sump pits Claims (Filed on 26/10/82) 1. Wherein the improvement comprises A The peripheral 'S' shape of the revolving piston is such that the total volume of the piston in relation to the volume of the cylinder in which it is operating gives a greater swept volume than any other pump of this kind.

B The hinged plate makes continuous seal with the piston.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims (1)

1. **WARNING** start of CLMS field may overlap end of DESC **.

   SPECIFICATION Positive displacement rotary pump The pump has been devised for the purpose of transfer of materials which are in, or can be put in, a state of liquefaction. A prototype proved to be capable of handling liquids of a wide viscosity range from water to concrete mixture. The dimensions and materials of construction, i.e.

   metals and/or plastics, will depend on the required application of a given unit.

   The pump Fig. 1 consists of a cylinder in which two impellent constituents operate, one constituent revolving and the other oscillating, Fig. IV 'D' and 'E' respectively.

   The revolving constituent 'D' Fig. IV is in the form of a cam on a driving spindle extending through a bearing, seal housing or stuffing box and gland in the top cover of the cylinder and beneath the cam to the lower bearing in the bottom of the cylinder. The cam is of a particular shape-peripheral- the extreme dimensions matching the diameter and depth of the cylinder with appropriate clearance. The dimensions of the cam are governed by considerations of strength of construction material and the achievement of maximum swept volume.

   The oscillating constituent Fig. IV 'E' is a hinged plate of which the leading edge on the other end from the hinge rides on the peripheral surface of the cam and is shaped to conform with the configuration of the cam. The leading edge of the hinged plate is in continuous contact with the peripheral sufface of the cam while oscillating in operation.

   The direction of rotation of the cam must be so that the hinged plate ridihg edge must lead on the cam periphery as opposed to trailing.

   The cylinder is in two parts-the body and the top cover. The bottom is integral with the cylinder wall and carries the lower bearings for the cam spindle and the hinged plate spindle. The top of the cylinder is flanged and carries studs which fasten the spigotted cover to the cylinder with nuts. The cover carries the upper bearings for the hinged plate spindle and the cam spindle together with the seal housing.

   The depth of the cylinder of the prototype was one quarter of the diameter but this ratio is not critical and may be varied according to requirement. There are inlet and discharge ports in the cylinder wall so positioned to obtain maximum swept volume. For submersible usage in handling material of very low viscosity the induction port should have the maximum area of opening possible, extending down the cylinder wall and across the bottom to within an acceptable distance of the bearing boss to minimise cavitation of the material to be transferrdd. For surface service using a suction pipe the two ports may be similar. Fig. II 'C'.

   The unit will induct and discharge in two cycles per revolution. The inlet port will be open to a subsequent induction before the previous discharge on the other side of the cam has been completed thus ensuring minimum pulsation.

   Where a pump is required to operate on a surface position drawing e.g from a sump and the running control is by a liquid level control mechanism and without personnel in attendance, it is advisable to fit a spring arrangement, Fig. I 'B' the spring is attached to a lever fitted to the top of the hinged plate spindle, which, in this case, would be extended above the cylinder cover. This keeps the hinged plate leading edge firmly in contact with the cam and eliminates the possibility of the pump having to be primed when operating at higher speeds while pumping liquids of high viscosity.

   The coupling, Fig. I 'A' need not be of the type shown.

   This type of pump will be useful in the following industries: Food Building Mines/Quarries Sewage Oil-e.g. as an 'in-line' accelerator in lone over-land pipe lines.

   Agriculture-already successfully used pumping slurry from cattle slatted court sump pits Claims (Filed on 26/10/82)

   1. Wherein the improvement comprises A The peripheral 'S' shape of the revolving piston is such that the total volume of the piston in relation to the volume of the cylinder in which it is operating gives a greater swept volume than any other pump of this kind.

   B The hinged plate makes continuous seal with the piston.