GB2135731A - Submersible pumps - Google Patents

Abstract

The pump, which is driven by on electric motor 9, comprises an impeller 5 mounted on a shaft 39 which is supported by bearings 35, 37 located between the motor and the impeller. A shaft seal 43 and a handle 23 for lifting the pump are provided. <IMAGE>

Description

SPECIFICATION Submersible electric pump The present invention relates to a portable submersible electric pump made in such a way as to offer advantages regarding economy and bulk.

According to the present invention a submersible centrifugal electric pump having an electric motor with a rotor on a drive shaft which is intended to have its axis vertical when in use, and an impeller mounted directly on the drive shaft of the motor, is characterised by supporting means for said shaft provided intermediately between the impeller and the rotor of the motor, which both project away therefrom in opposite directions.

In a preferredform, the supporting means extend in the axial direction.

The pump maycomprisea hub in which said supporting means is housed, said hub being advan tageously at least partially disposed inside cores of motor.

An embodimentofthe pump is hereinafter parficu larly described by way of non-limiting example with referencetothe accompanying drawing, wherein: Fig. is a simplified side elevation ofthe pump; Fig. 2 is a sectional view, on a vertical median plane, ofthe pump.

In the drawing,the pump consists of a body 1, made for example mostly of aluminium, having atthe bottom a cavity 3 in which is housed an impeller 5.

Above the cavity 3 there is a chamber 7 in which a motor9 is housed.

The body 11 of a suction filter is applied overthe lower opening ofthe cavity 3, and is closed by a base 13. The cavity 3 has on one side a threaded coupling 15 for a delivery piping.

A cover 17 is applied on top of the chamber 7, and closes it hermetically by means of a packing 19.

Underneath the cover 17 there are mounted various components inherent in the working of the motor, such as a condenser 21 in the case of a single-phase motor, while a handle 23 for lifting and handling the pump is fixed by means of a coupling 25 to the cover 17. Asupply cable 27, which passes th rough a tang 29 forming a seal, enters the cover 17.

The cavity3 and the chamber 7 are separated by a wall 31 from which extends, upwardly in this drawings, a hollow hub 33 inside which the shaft 39 of the motor9 is supported by means oftwo ball races 35 and 37 separated by a distance piece 38. The shaft 39 is guided, i.e. supported, in the intermediate zone between the impeller 5 and the rotor (or armature) 41 only by the support consisting of the two bearings 35 and 37 side by side, so that both the rotor (or armature) 41 and the impellerS project respectively from the top and bottom of the shaft 39. The axial position of shaft 39 is defined by the bearing 37, which rests on a seating 338 of hub 33 and by a mechanical seal 43 positioned, behind the impeller 5, on the top closure wall 31 ofthe cavity 3.

The hub 33 extends axially so that its top end is almost in contact with the bottom face of rotor 41. The whole structure is moreover so dimensionedthatthe cores 43M of the stator43P of motor 9 facing wall 31 occupythe space around hub 33, and are thus fairly close to the said wall 31. Athin protective cover 45,for example, made mostly of insulating material, is arranged overthe motor 9to separate it from the components arranged under the cover 17.

The advantages offered by the pump are obvious.

The arrangement with only one support makes it possible to reduce the axial dimension and the weight of the pump and also gives rise to considerable savings in construction. Simpler workmanship is required and assembly is quicker and easierthan in conventional constructions.Asthere is no second support, more space is available above the motor for the electrical equipment, particularly the condenser 21, andthe shape ofthe cover 17 does not haveto protrude upwards forthe purpose.

1. A submersible centrifugal electric pump having an electric motor with a rotor on a drive shaft which is intended to have its axis vertical when in use, and an impeller mounted directly on the drive shaft ofthe motor, characterised by supporting means for said shaft provided intermediately between the impeller and the rotor of the motor, which both project away therefrom in opposite directions.

2. An electric pump, as claimed in claim 1, wherein said supporting means extend in the axial direction.

3. An electric pump, as claimed in either of claims 1 and 2, comprising a hub in which said supporting means is housed, said hub being disposed inside windings ofthe motor.

4. Asubmersible centrifugal electric pump, as claimed in claim 1, having the shaft of the rotor supported in an intermediate position between the armature of the motor and the impeller of the pump, substantially as described herein with reference to the accompanying drawing.

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

Claims (4)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Submersible electric pump The present invention relates to a portable submersible electric pump made in such a way as to offer advantages regarding economy and bulk. According to the present invention a submersible centrifugal electric pump having an electric motor with a rotor on a drive shaft which is intended to have its axis vertical when in use, and an impeller mounted directly on the drive shaft of the motor, is characterised by supporting means for said shaft provided intermediately between the impeller and the rotor of the motor, which both project away therefrom in opposite directions. In a preferredform, the supporting means extend in the axial direction. The pump maycomprisea hub in which said supporting means is housed, said hub being advan tageously at least partially disposed inside cores of motor. An embodimentofthe pump is hereinafter parficu larly described by way of non-limiting example with referencetothe accompanying drawing, wherein: Fig. is a simplified side elevation ofthe pump; Fig. 2 is a sectional view, on a vertical median plane, ofthe pump. In the drawing,the pump consists of a body 1, made for example mostly of aluminium, having atthe bottom a cavity 3 in which is housed an impeller 5. Above the cavity 3 there is a chamber 7 in which a motor9 is housed. The body 11 of a suction filter is applied overthe lower opening ofthe cavity 3, and is closed by a base 13. The cavity 3 has on one side a threaded coupling 15 for a delivery piping. A cover 17 is applied on top of the chamber 7, and closes it hermetically by means of a packing 19. Underneath the cover 17 there are mounted various components inherent in the working of the motor, such as a condenser 21 in the case of a single-phase motor, while a handle 23 for lifting and handling the pump is fixed by means of a coupling 25 to the cover 17. Asupply cable 27, which passes th rough a tang 29 forming a seal, enters the cover 17. The cavity3 and the chamber 7 are separated by a wall 31 from which extends, upwardly in this drawings, a hollow hub 33 inside which the shaft 39 of the motor9 is supported by means oftwo ball races 35 and 37 separated by a distance piece 38. The shaft 39 is guided, i.e. supported, in the intermediate zone between the impeller 5 and the rotor (or armature) 41 only by the support consisting of the two bearings 35 and 37 side by side, so that both the rotor (or armature) 41 and the impellerS project respectively from the top and bottom of the shaft 39. The axial position of shaft 39 is defined by the bearing 37, which rests on a seating 338 of hub 33 and by a mechanical seal 43 positioned, behind the impeller 5, on the top closure wall 31 ofthe cavity 3. The hub 33 extends axially so that its top end is almost in contact with the bottom face of rotor 41. The whole structure is moreover so dimensionedthatthe cores 43M of the stator43P of motor 9 facing wall 31 occupythe space around hub 33, and are thus fairly close to the said wall 31. Athin protective cover 45,for example, made mostly of insulating material, is arranged overthe motor 9to separate it from the components arranged under the cover 17. The advantages offered by the pump are obvious. The arrangement with only one support makes it possible to reduce the axial dimension and the weight of the pump and also gives rise to considerable savings in construction. Simpler workmanship is required and assembly is quicker and easierthan in conventional constructions.Asthere is no second support, more space is available above the motor for the electrical equipment, particularly the condenser 21, andthe shape ofthe cover 17 does not haveto protrude upwards forthe purpose. CLAIMS

1. A submersible centrifugal electric pump having an electric motor with a rotor on a drive shaft which is intended to have its axis vertical when in use, and an impeller mounted directly on the drive shaft ofthe motor, characterised by supporting means for said shaft provided intermediately between the impeller and the rotor of the motor, which both project away therefrom in opposite directions.

2. An electric pump, as claimed in claim 1, wherein said supporting means extend in the axial direction.

3. An electric pump, as claimed in either of claims 1 and 2, comprising a hub in which said supporting means is housed, said hub being disposed inside windings ofthe motor.

4. Asubmersible centrifugal electric pump, as claimed in claim 1, having the shaft of the rotor supported in an intermediate position between the armature of the motor and the impeller of the pump, substantially as described herein with reference to the accompanying drawing.