|Title of Invention||
"A BEARING SYSTEM FOR SUPPORTING VERTICALLY ARRANGED MOTOR AND PUMP OF A SUBMERSIBLE PUMP"
|Abstract||A bearing system for supporting vertically arranged, motor and pump of a submersible pump, which bearing system comprises a ball bearing adapted to take up static and dynamic, axial and radial loads to which the connecting shaft (11) is subjected under operation, and incorporating a housing (14) in which the said bearing is enclosed, characterized therein, that the housing (14) incorporates a ball bearing (13) and a seal (12) with the connecting shaft (11) mounted in the bore of the bearing. FIG. 4|
The present invention relates to a bearing system for supporting vertically arranged, motor and pump of a submersible pump.
The present invention refers to a bearing system for a Submersible Pump used for lifting underground water from Bore wells. The present invention will replace the Thrust Pad assembly whose function is to carry the hydrodynamic pressure of the pump.
Background of the invention
The Submersible pump operates in an environment of water and silt. The different types of submersible pumps are classified based on the outer diameter of the pump and hence we have the four inches, six inches and the eight inch pumps. The pump operates using electricity and is installed at a depth of 100 feet to 1000 feet below ground depending on the level at which water is available.
The present invention can be retrofitted onto the submersible pump replacing the Thrust Pad Assembly 3a as shown in fig-1. The eailier invention called the Thrust pad assembly has too many parts and also has a higher surface contact area and hence higher wear and tear, heat generation and maintenance. Also the process of assembling the thrust pad assembly onto the pump is cumbersome when compared to the present invention.
Summary of the invention
The purpose of the present invention is to provide a bearing system for supporting a vertically arranged shaft with Motor and Impellers. The present invention is retro fitted onto the submersible pump in place of the Thrust Pad Assembly 3a, as shown in fig 1.
The earlier design of Thrust Pad assembly - fig-2 has higher surface contact area between the Thrust pad 1 and Wobble 3 in fig-2. This increases the frictional forces and also the probability of higher wear and tear of the parts.
Brief description of the drawing
Hereinafter the invention will be further described with reference to embodiment shown in the accompanying drawing.
Fig. 1 shows the exploded view of the Submersible Pump with the earlier invention called the Thrust Pad assembly 3a.
Fig-2 shows the exploded view of the earlier invention with all the parts numbered 1 to 7.
Fig 3 shows the exploded view of the present invention with parts 11 to 14.
Fig-4 shows the cross section of the new invention which includes parts 11 to 14.
Brief description of preferred embodiment
Fig. 4 is a cross section of the Unitised Bearing Assembly 11 is the Connecting Shaft which mates with the motor shaft of the Submersible pump at the top end. The bottom end of the connecting shaft 11 fits into the bearing 13. The ball bearing 13 fits into the housing 14. The Special Seal 12 mounted between the connecting shaft 11 and the housing 14 ensures that no water enters the ball bearing 13 area.
The Bearing 13 is mounted inside the housing 14 with an interference fit thus making the two an integral unit. The connecting shaft 11 is mounted into the bearing 13 with an interference fit again making the three parts as an integral unit. The Seal 12 is mounted with an interference fit into the housing 14 thus making all the four parts as one integral unit. Refer fig 3 also for better understanding.
The complete assembly is then mounted onto the submersible pump fig 1 by the help of 3 alien screws. The motor shaft mates into the connecting shaft with the help of a key in the keyway This helps the positive motion to be transmitted from the motor shaft to the bearing.
With this specific design of the bearing housing 14, it has been possible to give it a very low installation height, whereby it reduces the overall height of the unit when compared to the earlier invention.
A vegetable oil based grease is used to lubricate the bearing 13. This helps to increase the life of the bearing when compared to the earlier invention.
The specific design of unitized bearing assembly makes the invention particularly suited for retio-fit purpose, because it easily replaces the earlier invention - the Thrust Pad Assembly without any modifications on the submersible pump or any associated components in the pump.
The present Invention has increased service life to the bearing assembly and also a lower maintenance requirement.
The invention is not only limited by the details of bearing system-forming part of embodiment illustrated in the accompanying drawing, but modifications and variants are possible within the scope of the attached claims.
1. A bearing system for supporting vertically arranged, motor and
pump of a submersible pump, which bearing system comprises a ball
bearing adapted to take up static and dynamic, axial and radial loads
to which the connecting shaft (11) is subjected under operation, and
incorporating a housing (14) in which the said bearing is enclosed,
that the housing (14) incorporates a ball bearing (13) and a seal (12) with the connecting shaft (11) mounted in the bore of the bearing.
2. A bearing system as claimed in claim 1, wherein the seal (12) is
provided to bridge a space between an interior cylindrical surface in
the housing (14) and an external envelope surface of the connecting
3. A bearing system as claimed in claim 1 or 2, wherein the seal
(12) is an annular rubber seal.
|Indian Patent Application Number||3448/DEL/2005|
|PG Journal Number||35/2009|
|Date of Filing||23-Dec-2005|
|Name of Patentee||AKTIEBOLAGET SKF,|
|Applicant Address||SE-415 50 GOTEBORG, SWEDEN.|
|PCT International Classification Number||F04B 37/00|
|PCT International Application Number||N/A|
|PCT International Filing date|