GB2188102A - Pump - Google Patents

Abstract

A pump comprises rotor 2 with piston 3 located in a transverse passageway. The housing 7 is closed by backplate 5 bearing a pin 4 offset from the axis of rotor 2 and engaging a transverse slot in the piston. Rotation of the rotor causes reciprocation of the piston twice per revolution and hence pumping of fluid from inlet 6 to the outlet. As shown in Figure 2, inlet and outlet 6 connect with transfer relief grooves on the inside surface of housing 7. <IMAGE>

Description

SPECIFICATION Reciprotary pump This invention relates to a positive displacement pump.

Of the existing types of pump some utilisevalves which increase the cost ofthe unit and must of necessity be maintained in good order; those which do not, need to be positioned initially below the level ofthefluid being pumped in orderto primethe system. Pumps of similar construction such as the centrifugal type may not provide adequate pressure for some applications, moreover by definition they are susceptible to 'slippage' undervarying pressure loads.

The reciprotary pump is a positive pressure universal, variable speed, reversible, self priming fluid pump using a piston in a rotating cylinder driven by a stationary eccentric pivot pin. The whole comprises two stationary and two moving parts and an oil seal/bearing assembly. The unit can be made in any material including glass and be of any dimensions. Due to its unique design it will tolerate solids in suspension in the fluid being pumped.

Various existing types of conventional seal (see diagram 1) and engineering techniques may be incorporated to improve performance ofthe pump depending on its application. The pump has a non-destructive action and may be used with fluids having some lubricating properties eg. foodstuffs of various viscosity.

A specific embodiment of the invention will now be described byway of example with reference to the accompanying drawing in which Diagram 1 showsthepumpexploded insideview Diagram 2 illustrates the transfer porting arrangements in the pump body Referring to the drawings the said pump is driven by rotating power input shaft (1) which is an integral part of the piston carrier/cylinder (2). As the carrier housing the piston (3) is rotated the piston is forced to move in its cylinder by stationary eccentric pin (4) on the backplate (5).In one 3600 revolution of the piston carrier the piston is forced to move to the extremeties of its movement twice, thus completing two intake and exhaust strokes causing fluid to be taken in through one inlet/outlet (6) and forced out through the other; twice ie. Intake and exhaust stroke are executed simultaneously. Fluid is drawn in by vacuum created in the rotating cylinder and its path is via transfer port-like grooves in the stationary housing (7) (see second diagram) as is the fluid being pushed out by the piston. Hence for every rotation of the input shaft a known volume offluid is displaced within calculable tolerances. The combination of reciprocating piston in a rotating cylinder achieves positive displacement offluid in either direction without the use of a valve mechanism in the reciprotary pump.

1. A reciprotary pump comprising two moving components, a reciprocating piston in a rotating cylinder, with one bearing supporting the power input shaft, rotation whereof in either sense providing positive displacement in either direction, provided with no valves.

2. A reciprotary pump as claimed in claim 1 wherein transfer ports in the pump body permit fluid flow through the pump engineered to minimize cavitation effects in the fluid.

3. A reciprotary pump as claimed in claim 1 or claim 2 wherein pumping action produces partial vacuum for self priming.

4. A reciprotary pump as claimed in claim 1 or claim 2 wherein operation with fluid carrying solids of predetermined size will not arrest the movement of the piston orthe piston carrier.

5. A reciprotary pump as claimed in any preceding claim, wherein the piston is provided with sealing rings and the backplate seals againstthe piston carrier and the piston carrier is sealed inside the housing for increased pressure of operation.

6. A reciprotary pump as claimed in any preceding claim, wherein the piston reciprocates twice each revolution delivering a fixed volume of fluid per rotation.

7. A reciprotary pump substantially as described herein with reference to diagrams 1 and 2 of the accompanying drawings.

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

Claims (7)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Reciprotary pump This invention relates to a positive displacement pump. Of the existing types of pump some utilisevalves which increase the cost ofthe unit and must of necessity be maintained in good order; those which do not, need to be positioned initially below the level ofthefluid being pumped in orderto primethe system. Pumps of similar construction such as the centrifugal type may not provide adequate pressure for some applications, moreover by definition they are susceptible to 'slippage' undervarying pressure loads. The reciprotary pump is a positive pressure universal, variable speed, reversible, self priming fluid pump using a piston in a rotating cylinder driven by a stationary eccentric pivot pin. The whole comprises two stationary and two moving parts and an oil seal/bearing assembly. The unit can be made in any material including glass and be of any dimensions. Due to its unique design it will tolerate solids in suspension in the fluid being pumped. Various existing types of conventional seal (see diagram 1) and engineering techniques may be incorporated to improve performance ofthe pump depending on its application. The pump has a non-destructive action and may be used with fluids having some lubricating properties eg. foodstuffs of various viscosity. A specific embodiment of the invention will now be described byway of example with reference to the accompanying drawing in which Diagram 1 showsthepumpexploded insideview Diagram 2 illustrates the transfer porting arrangements in the pump body Referring to the drawings the said pump is driven by rotating power input shaft (1) which is an integral part of the piston carrier/cylinder (2). As the carrier housing the piston (3) is rotated the piston is forced to move in its cylinder by stationary eccentric pin (4) on the backplate (5).In one 3600 revolution of the piston carrier the piston is forced to move to the extremeties of its movement twice, thus completing two intake and exhaust strokes causing fluid to be taken in through one inlet/outlet (6) and forced out through the other; twice ie. Intake and exhaust stroke are executed simultaneously. Fluid is drawn in by vacuum created in the rotating cylinder and its path is via transfer port-like grooves in the stationary housing (7) (see second diagram) as is the fluid being pushed out by the piston. Hence for every rotation of the input shaft a known volume offluid is displaced within calculable tolerances. The combination of reciprocating piston in a rotating cylinder achieves positive displacement offluid in either direction without the use of a valve mechanism in the reciprotary pump. CLAIMS

1. A reciprotary pump comprising two moving components, a reciprocating piston in a rotating cylinder, with one bearing supporting the power input shaft, rotation whereof in either sense providing positive displacement in either direction, provided with no valves.

2. A reciprotary pump as claimed in claim 1 wherein transfer ports in the pump body permit fluid flow through the pump engineered to minimize cavitation effects in the fluid.

3. A reciprotary pump as claimed in claim 1 or claim 2 wherein pumping action produces partial vacuum for self priming.

4. A reciprotary pump as claimed in claim 1 or claim 2 wherein operation with fluid carrying solids of predetermined size will not arrest the movement of the piston orthe piston carrier.

5. A reciprotary pump as claimed in any preceding claim, wherein the piston is provided with sealing rings and the backplate seals againstthe piston carrier and the piston carrier is sealed inside the housing for increased pressure of operation.

6. A reciprotary pump as claimed in any preceding claim, wherein the piston reciprocates twice each revolution delivering a fixed volume of fluid per rotation.

7. A reciprotary pump substantially as described herein with reference to diagrams 1 and 2 of the accompanying drawings.