CN201616727U

CN201616727U - Shaft current prevention structure of small-sized water wheel generator

Info

Publication number: CN201616727U
Application number: CN2010201247969U
Authority: CN
Inventors: 金阿水; 沈裕生; 谢允太; 王人江
Original assignee: ZHEJIANG LINHAI ELECTRIC MACHINERY WORKS CO Ltd
Current assignee: Zhejiang Linhai Zhefu Electric Machniery Co., Ltd.
Priority date: 2010-03-05
Filing date: 2010-03-05
Publication date: 2010-10-27
Anticipated expiration: 2020-03-05

Abstract

The utility model relates to a water wheel generator, in particular to a shaft current prevention structure of a small-sized water wheel generator. The structure comprises a rotary shaft, a rolling bearing, a bearing bush, an end cover and a support, wherein the bearing bush and the support are fixed on the end cover by a screw stem; the rolling bearing is fixed on the rotary shaft; a bearing cover is arranged outside the rolling bearing; an insulation pad is arranged between the excircle of the bearing bush and the end cover; the excircle of the screw stem is provided with an insulation sleeve; a gasket is arranged between the screw stem and the support; an insulation gasket is padded between the gasket and the support; therefore, the rolling bearing and the end cover of an electric motor are insulated, so as to realize the breaking of short current. The present bearing of the small-sized water wheel generator is not provided with an insulation structure for preventing the shaft current, so as to be extremely easy to cause the electrocorrosion of the bearing of the generator. The shaft current prevention structure avoids the generation of the shaft current of the small-sized water wheel generator.

Description

Small hydro turbine prevents the structure of shaft current

Technical field

The utility model relates to a kind of hydraulic generator, and particularly a kind of small hydro turbine prevents the structure of shaft current.

Background technology

It is below 1250 kilowatts that small hydro turbine refers generally to capacity and seat No. is a hydraulic generator below 990, the small hydro turbine bearing that uses does not prevent the insulation system of shaft current now, bearing is under the situation of running up, when parameter mismatees such as the number of poles of generator, flute profile, might form shaft current, cause the bearing galvano-cautery of generator, dynamo bearing was just damaged about one month.

Summary of the invention

In order to solve the shaft current problem of above-mentioned small hydro turbine, the purpose of this utility model provides the structure that a kind of small hydro turbine of eliminating shaft current prevents shaft current.

The utility model is achieved in that small hydro turbine prevents the structure of shaft current, it comprises rotating shaft, rolling bearing, bearing holder (housing, cover), end cap and support, bearing holder (housing, cover) and support are fixed on the end cap by screw rod, rolling bearing is fixed on that there is bearing cap Roll dynamic bearing outside in the rotating shaft, has insulation cushion between bearing holder (housing, cover) cylindrical and the end cap, the screw rod cylindrical is with insulating sleeve, between screw rod and the support packing ring is arranged, be lined with insulating washer between packing ring and the support,, shaft current opened circuit the bearing of hydraulic generator and end cap insulation.

The utility model compared with prior art has tangible technique effect:

1, small hydro turbine one end bearing of the present utility model has adopted insulation system, has therefore prevented from effectively to damage bearing owing to the generation of shaft current.

2, add insulating barrier between bearing holder (housing, cover) cylindrical and the end cap, the screw rod of fastening exterior and interior cover adds insulating sleeve, is lined with insulation cushion between packing ring and the support, with the restrictive axes electric current, avoids bearing to be subjected to galvano-cautery.

3, the bearing of former small hydro turbine has only nearly one month useful life, and the small hydro turbine that adopts the utility model structure to produce is on probation over 2 years, and bearing is also excellent, has prolonged the useful life of bearing greatly.

4, the utility model is simple in structure, easy for installation.

Description of drawings

Now in conjunction with the accompanying drawings an embodiment of the present utility model is specified.

Fig. 1 is the structural representation that the utility model small hydro turbine prevents shaft current.

Table number is represented among the figure:

The 1-end cap, 2-insulating sleeve, 3-insulating washer, 4-packing ring, 5-screw rod, 6-insulation cushion, 7-bearing holder (housing, cover), 8-rolling bearing, 9-bearing cap, 10-rotating shaft, 11-support.

Embodiment

Shown in accompanying drawing 1, a kind of small hydro turbine prevents the structure of shaft current, comprise rotating shaft [10], rolling bearing [8], bearing holder (housing, cover) [7], end cap [1] and support [11], bearing holder (housing, cover) [7] is fixed on the end cap [1] by screw rod [5] with support [11], rolling bearing [8] is fixed in the rotating shaft [10], there is bearing cap [9] rolling bearing [8] outside, has insulation cushion [6] between bearing holder (housing, cover) [7] cylindrical and the end cap [1], screw rod [5] cylindrical is with insulating sleeve [2], be lined with packing ring [4] between screw rod [5] and the support [11], be lined with insulating washer [3] between packing ring [4] and the support [11].With the small hydro turbine that adopts the utility model structure to produce is example, on probation over 2 years bearing also excellent.

Claims

1. a small hydro turbine prevents the structure of shaft current, comprise rotating shaft [10], rolling bearing [8], bearing holder (housing, cover) [7], end cap [1] and support [11], bearing holder (housing, cover) [7] is fixed on the end cap [1] by screw rod [5] with support [11], rolling bearing [8] is fixed in the rotating shaft [10], there is bearing cap [9] rolling bearing [8] outside, it is characterized in that: have insulation cushion [6] between bearing holder (housing, cover) [7] cylindrical and the end cap [1], screw rod [5] cylindrical is with insulating sleeve [2], between screw rod [5] and the support [11] packing ring [4] is arranged, be lined with insulating washer [3] between packing ring [4] and the support [11].