GB2038944A

GB2038944A - Centrifugal Pump Equipment

Info

Publication number: GB2038944A
Application number: GB7902888A
Authority: GB
Original assignee: Coal Industry Patents Ltd
Current assignee: Coal Industry Patents Ltd
Priority date: 1978-12-28
Filing date: 1979-01-26
Publication date: 1980-07-30

Abstract

The equipment constitutes a vertical column comprising a base filter arrangement 1, a centrifugal pump 2, a co-axial drive arrangement 3 and a hydraulically driven motor 4. The housing 31 for the drive arrangement 3 is sealably secured to the motor housing 39 and to the pump housing 15. <IMAGE>

Description

SPECIFICATION Centrifugal Pump Equipment This invention relates to centrifugal pump equipment.

In particular, although not exclusively, the present invention relates to centrifugal pump equipment comprising a hydraulically driven motor driving a centrifugal pump through a co axial arrangement.

An object of the present invention is to provide improved centrifugal pump equipment which is simple and robust.

According to the present invention centrifugal pump equipment comprises a centrifugal pump including an impeller driveably mounted on a rotary shaft and a housing supporting a bearing for the pump shaft and defining an axial liquid inlet and a tangential liquid outlet, a filter arrangement mounted up stream of the liquid inlet and a co-axial drive arrangement driveably connecting the pump shaft to a hydraulic motor sealably mounted on a casing for the co-axial drive arrangement, the casing being sealably mounted on the pump housing.

Preferably, the drive arrangement comprises a flexible coupling.

Conveniently, the hydraulic motor is provided with a feed and return for pressure fluid, a drain line being provided from the motor housing.

Advantageously, the drain line is provided with a non-return valve.

By way of example only, one embodiment of the present invention will be described with reference to the accompanying drawings, in which: Figure 1 is a side view of centrifugal pump equipment constructed in accordance with the present invention; Figure 2 is a plan of Figure 1; and Figure 3 is a section taken along line Ill-Ill of Figure 1.

In the drawings, the centrifugal pump equipment is shown to constitute a vertical column comprising a basal filter arrangement 1, a centrifugal pump 2, a co-axial drive arrangement 3 and a hydraulically driven motor 4.

The filter arrangement 1 comprises a cylindrical housing 5 having a floor mounted base 6 and an upper annular lid 7 connected to the base by a plurality of tubular components 8. An inlet for liquid is provided by a filter panel 10 extending circumferentially around the housing while the axial opening 11 defined by the annular lip provides an outlet from the filter arrangement to the centrifugal pump.

The centrifugal pump 2 comprises a substantially cylindrical housing 1 5 sealably connected to the filter arrangement lid by socket headed set screws 1 6 located within the tubular components 8 and defining an axial liquid inlet 17 adjacent to the previously mentioned axial opening 11 and a tangential liquid outlet 1 8 for connection to pipe means (not shown). An impeller 1 9 is driveably mounted within the housing 1 5 on a rotary shaft 20 rotary mounted in a bearing bush 21 supported in the upper wall of the pump housing. The bearing bush 21 has an upper outwardly extending flange sandwiched between the upper face of the pump housing wall and a collar 22 fixed to the shaft 20 by a socket headed setscrew 23.There is no seal provided between the bearing bush 21 and the shaft 20.

The uppermost end of the shaft 20 is driveably connected to the co-axial drive arrangement comprising a flexible coupling 25 including two opposed co-axially arranged cup components 26 and an intermediate resilient pad 27 compressed between the two cups 26. Each of the cups has a tapered bore driveably engaged by a wedge shaped bush 29 keyed to the shaft 20 or to a drive shaft 30 of the hydraulic motor 4.

A housing 31 for the co-axial drive arrangement is sealably secured to the hydraulic motor housing 29 by a plurality of bolts 32 and to the pump housing by a plurality of bolts 33. Both the joints associated with the bolts 32 and 33 are made with a sealing compound or seal.

The hydraulic motor 4 is fed with pressure fluid along feed pipe 35 and returned along return pipe 36. A drain line 37 is provided to drain fluid leaking into the motor housing 29. A non-return valve 40 is provided in the drain line to ensure no damage is suffered by the motor should an operator incorrectly connect the feed and return pipes to the motor.

In use, the pump equipment is submerged in a liquid, for example, in a pool of water which has collected in a hollow in underground mine working, or in a tank of oil with the base 6 lying on the mine or tank floor.

Pressure fluid is fed along line 35 to drive the motor which in turn drives the impeller 19 through the co-axial drive arrangement 3 and the shaft 20. Liquid is urged by the rotating impeller through the filter panel 10 and the axial opening 11 into the pump inlet 1 7 and radially through the pump 2 towards the tangential outlet 1 8 and along discharge pipe means. Operation is continued until the liquid is cleared away.

Throughout pumping an air lock is provided within the drive arrangement housing 31 and as the pressure fluid fed to drive the motor 4 is at a higher pressure than the liquid being pumped liquid does not tend to flow into the motor housing. Consequently, the pump equipment construction is simplified as no rotary seal is required externally of the motor.

Claims

1. Centrifugal pump equipment comprising a centrifugal pump including an impeller driveably mounted on a rotary shaft and a housing supporting a bearing for the pump shaft and defining an axial liquid inlet and a tangential liquid outlet, a filter arrangement mounted up stream of the liquid inlet and a co-axial drive arrangement driveably connecting the pump shaft to a hydraulic motor sealably mounted on a casing for

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

Claims

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Centrifugal Pump Equipment This invention relates to centrifugal pump equipment. In particular, although not exclusively, the present invention relates to centrifugal pump equipment comprising a hydraulically driven motor driving a centrifugal pump through a co axial arrangement. An object of the present invention is to provide improved centrifugal pump equipment which is simple and robust. According to the present invention centrifugal pump equipment comprises a centrifugal pump including an impeller driveably mounted on a rotary shaft and a housing supporting a bearing for the pump shaft and defining an axial liquid inlet and a tangential liquid outlet, a filter arrangement mounted up stream of the liquid inlet and a co-axial drive arrangement driveably connecting the pump shaft to a hydraulic motor sealably mounted on a casing for the co-axial drive arrangement, the casing being sealably mounted on the pump housing. Preferably, the drive arrangement comprises a flexible coupling. Conveniently, the hydraulic motor is provided with a feed and return for pressure fluid, a drain line being provided from the motor housing. Advantageously, the drain line is provided with a non-return valve. By way of example only, one embodiment of the present invention will be described with reference to the accompanying drawings, in which: Figure 1 is a side view of centrifugal pump equipment constructed in accordance with the present invention; Figure 2 is a plan of Figure 1; and Figure 3 is a section taken along line Ill-Ill of Figure 1. In the drawings, the centrifugal pump equipment is shown to constitute a vertical column comprising a basal filter arrangement 1, a centrifugal pump 2, a co-axial drive arrangement 3 and a hydraulically driven motor 4. The filter arrangement 1 comprises a cylindrical housing 5 having a floor mounted base 6 and an upper annular lid 7 connected to the base by a plurality of tubular components 8. An inlet for liquid is provided by a filter panel 10 extending circumferentially around the housing while the axial opening 11 defined by the annular lip provides an outlet from the filter arrangement to the centrifugal pump. The centrifugal pump 2 comprises a substantially cylindrical housing 1 5 sealably connected to the filter arrangement lid by socket headed set screws 1 6 located within the tubular components 8 and defining an axial liquid inlet 17 adjacent to the previously mentioned axial opening 11 and a tangential liquid outlet 1 8 for connection to pipe means (not shown). An impeller 1 9 is driveably mounted within the housing 1 5 on a rotary shaft 20 rotary mounted in a bearing bush 21 supported in the upper wall of the pump housing. The bearing bush 21 has an upper outwardly extending flange sandwiched between the upper face of the pump housing wall and a collar 22 fixed to the shaft 20 by a socket headed setscrew 23.There is no seal provided between the bearing bush 21 and the shaft 20. The uppermost end of the shaft 20 is driveably connected to the co-axial drive arrangement comprising a flexible coupling 25 including two opposed co-axially arranged cup components 26 and an intermediate resilient pad 27 compressed between the two cups 26. Each of the cups has a tapered bore driveably engaged by a wedge shaped bush 29 keyed to the shaft 20 or to a drive shaft 30 of the hydraulic motor 4. A housing 31 for the co-axial drive arrangement is sealably secured to the hydraulic motor housing 29 by a plurality of bolts 32 and to the pump housing by a plurality of bolts 33. Both the joints associated with the bolts 32 and 33 are made with a sealing compound or seal. The hydraulic motor 4 is fed with pressure fluid along feed pipe 35 and returned along return pipe 36. A drain line 37 is provided to drain fluid leaking into the motor housing 29. A non-return valve 40 is provided in the drain line to ensure no damage is suffered by the motor should an operator incorrectly connect the feed and return pipes to the motor. In use, the pump equipment is submerged in a liquid, for example, in a pool of water which has collected in a hollow in underground mine working, or in a tank of oil with the base 6 lying on the mine or tank floor. Pressure fluid is fed along line 35 to drive the motor which in turn drives the impeller 19 through the co-axial drive arrangement 3 and the shaft 20. Liquid is urged by the rotating impeller through the filter panel 10 and the axial opening 11 into the pump inlet 1 7 and radially through the pump 2 towards the tangential outlet 1 8 and along discharge pipe means. Operation is continued until the liquid is cleared away. Throughout pumping an air lock is provided within the drive arrangement housing 31 and as the pressure fluid fed to drive the motor 4 is at a higher pressure than the liquid being pumped liquid does not tend to flow into the motor housing. Consequently, the pump equipment construction is simplified as no rotary seal is required externally of the motor. Claims

1. Centrifugal pump equipment comprising a centrifugal pump including an impeller driveably mounted on a rotary shaft and a housing supporting a bearing for the pump shaft and defining an axial liquid inlet and a tangential liquid outlet, a filter arrangement mounted up stream of the liquid inlet and a co-axial drive arrangement driveably connecting the pump shaft to a hydraulic motor sealably mounted on a casing for the co-axial drive arrangement, the casing being sealably mounted on the pump housing.

2. Centrifugal pump equipment as claimed in claim 1, in which the drive arrangement comprises a flexible coupling.

3. Centrifugal pump equipment as claimed in 1 or 2, in which the hydraulic motor is provided with a feed and return for pressure fluid, a drain line being provided from the motor housing.

4. Centrifugal pump equipment substantially as described with reference to the accompanying drawings.

4. Centrifugal pump equipment as claimed in claim 3, in which the drain line is provided with a non-return valve.

5. Centrifugal pump equipment substantially as described with reference to the accompanying drawings.

New Claims or Amendments to Claims filed on 27 July 1979.

Superseded Claims t to

5.

New or Amended Claims:

1. Centrifugal pump equipment comprising a centrifugal pump including an impeller driveably mounted on a rotary shaft and a housing supporting a bearing for the pump shaft and defining an axial liquid inlet and a tangential liquid, outlet, a filter arrangement mounted up stream of the liquid inlet and a co-axial drive arrangement comprising a flexible coupling and driveably connecting the pump shaft to a hydraulic motor sealably mounted on a casing for the co-axial drive arrangement, the casing being sealably mounted on the pump housing.

2. Centrifugal pump equipment as claimed in claim 1, in which the hydraulic motor is provided with a feed and return for pressure fluid, a drain line being provided from the motor housing.

3. Centrifugal pump equipment as claimed in claim 2, in which the drain line is provided with a non-return valve.