CN205977636U

CN205977636U - Motor economizer

Info

Publication number: CN205977636U
Application number: CN201620734392.9U
Authority: CN
Inventors: 车卫江; 张小虎
Original assignee: Department Of Inner Mongolia Coal Chemical Industry Co Ltd
Current assignee: Department Of Inner Mongolia Coal Chemical Industry Co Ltd
Priority date: 2016-07-12
Filing date: 2016-07-12
Publication date: 2017-02-22
Anticipated expiration: 2026-07-12

Abstract

The utility model discloses a motor economizer, it includes circuit breaker QF1, circuit breaker QF2, isolator QS1 6, an electric feed water pump and the 2nd electric feed water pump, circuit breaker QF1 passes through isolator QS3 and inserts an electric feed water pump, circuit breaker QF2 passes through isolator QS6 and inserts the 2nd electric feed water pump, still include high -voltage inverter, circuit breaker QF1 still inserts high -voltage inverter through isolator QS1, circuit breaker QF2 still inserts high -voltage inverter through isolator QS4, high -voltage inverter inserts an electric feed water pump through isolator QS2 respectively, insert the 2nd electric feed water pump through isolator QS5. The utility model discloses change two electric feed water pump into frequency conversion, one set of converter of two electric feed water pump sharings can reach the reduction loss so simultaneously, can practice thrift investment cost again.

Description

A kind of motor energy saving devices

Technical field

This utility model is related to a kind of motor energy saving devices.

Background technology

My company power houses are configured with 4 electrically driven feed pumps, and feedwater pump discharge converges at feed main to #1, #2 boiler Supply water.Wherein #1, #2 electrically driven feed pump adopts fluid coupling to adjust speed of feedwater；#3, #4 electrically driven feed pump is constant speed pump. The method of operation under normal circumstances：#1 electrically driven feed pump, #3 electrically driven feed pump run, #2 electrically driven feed pump stand-by heat, and #4 is electronic to be given Water pump cold standby.Fluid coupling is with MC as prime mover, using oil as working medium, has prime mover driven speedup tooth Wheel, drives pump impeller (drivewheel) that mechanical output is passed to working medium oil by speed increasing gear and drives turbine (driven pulley) rotation, driven Wheel is connected with water pump, controls feedwater pump revolution by scoop tube.There is following defect in which：

1st, slip power consumes greatly, is changed into heat and is dissipated by profit cooling system；

2nd, it is arranged between motor and feed pump, need firm basis；

3rd, pressure oil system, scoop tube regulating system maintenance are big；

4th, motor constant speed is run, dash current considerable influence motor service life during startup；

5th, under high speed conditions, because revolutional slip impact throws switch 3% about；

6th, coupler efficiency is typically relatively low, 94% under rated speed, under Variable Velocity Condition, lowers with rotating speed and reduces, change Larger.

Utility model content

The defect existing for above-mentioned background technology, this utility model provides a kind of motor energy saving devices.

For achieving the above object, the technical solution adopted in the utility model is：It include circuit breaker Q F1, circuit breaker Q F2, Disconnecting switch QS1-6, the first electrically driven feed pump and the second electrically driven feed pump, circuit breaker Q F1 accesses first by disconnecting switch QS3 Electrically driven feed pump, circuit breaker Q F2 accesses the second electrically driven feed pump by disconnecting switch QS6, also includes high voltage converter, chopper QF1 accesses high voltage converter also by disconnecting switch QS1, and circuit breaker Q F2 accesses high voltage converter also by disconnecting switch QS4, High voltage converter is given by disconnecting switch QS2 access the first electrically driven feed pump, by disconnecting switch QS5 access second is electronic respectively Water pump.

This utility model has the advantages that：Just two electrically driven feed pumps of this utility model are changed to variable frequency adjustment, Two electrically driven feed pumps share a set of converter simultaneously, so can reduce loss, and can investment reduction cost.

Brief description

In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, below will be to embodiment Or in description of the prior art the accompanying drawing of required use be briefly described it should be apparent that, drawings in the following description are only It is some embodiments of the present utility model, for those of ordinary skill in the art, before not paying creative labor Put, other accompanying drawings can also be obtained according to these accompanying drawings.

Fig. 1 is circuit theory diagrams of the present utility model.

Specific embodiment

Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Site preparation description is it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.It is based on Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of not making creative work Embodiment, broadly falls into the scope of protection of the invention.

As shown in figure 1, this utility model include circuit breaker Q F1, circuit breaker Q F2, disconnecting switch QS1-6, first electronic to Water pump 1 (#3 electrically driven feed pump) and the second electrically driven feed pump 2 (#4 electrically driven feed pump), circuit breaker Q F1 connects 10KV1 bus, open circuit Device QF2 connects 10KV2 bus, circuit breaker Q F1 by disconnecting switch QS3 access the first electrically driven feed pump 1, circuit breaker Q F2 pass through every Leave pass QS6 and access the second electrically driven feed pump 2, also include high voltage converter 3, circuit breaker Q F1 accesses also by disconnecting switch QS1 High voltage converter 3, circuit breaker Q F2 accesses high voltage converter 3 also by disconnecting switch QS4, and high voltage converter 3 passes through isolation respectively Switch QS2 accesses the first electrically driven feed pump 1, accesses the second electrically driven feed pump 2 by disconnecting switch QS5.

Operation principle of the present utility model：

(1) normal operating mode：During normal operation, such as 3# feed pump operates under frequency control state, and power supply passes through " QS1 ", to converter, is then exported to 3# feed pump by " QS2 ".Now 4# feed pump is in power frequency resting state and (closes QS6)；

(2) feed pumps break down the method for operation of situation：When the work feed pump of VFC breaks down jump Lock, the or during fault such as undercapacity, when feed pump or corresponding motor occur abnormal, when need to shut down, can pass through DSC configuration power frequency Start stand-by pump；

(3) method of operation after one section of auxiliary bus bar dead electricity：After converter section dead electricity, automatic auxiliary feed water pump；

(4) work as frequency converter failure, method of operation when needing out of service for a long time：Work as frequency converter failure, short-term can not be extensive Again run when, can easily will " QS3 ", " QS6 " put into, chain two feed pumps carry out power frequency work (disconnection QS1, QS2, QS4, QS5), converter can exit maintenance；

(5) need the mode of operation down to auxiliary feed water pump converting operation after feed pump long-time converting operation： When the long-time converting operation of 3# feed pump, when need to switch to 4# feed pump converting operation, need first by 4# feed pump power frequency startup, so Afterwards 3# is fed water pump shutdown disconnect QS1, QS2, close QS3 power frequency startup, now exits converter.Then 4# is given Water pump is stopped transport and is disconnected QS6, and close QS4, QS5 variable frequency starting, by 3# feedwater pump shutdown after stablizing.

The foregoing is only preferred embodiment of the present utility model, not in order to limit this utility model, all this Within the spirit of utility model and principle, any modification, equivalent substitution and improvement made etc., should be included in this utility model Protection domain within.

Claims

1. a kind of motor energy saving devices it is characterised in that：Including circuit breaker Q F1, circuit breaker Q F2, disconnecting switch QS1-6, One electrically driven feed pump and the second electrically driven feed pump, circuit breaker Q F1 accesses the first electrically driven feed pump, open circuit by disconnecting switch QS3 Device QF2 accesses the second electrically driven feed pump by disconnecting switch QS6, also includes high voltage converter, and circuit breaker Q F1 is also by keeping apart Close QS1 and access high voltage converter, circuit breaker Q F2 accesses high voltage converter also by disconnecting switch QS4, high voltage converter leads to respectively Cross disconnecting switch QS2 to access the first electrically driven feed pump, access the second electrically driven feed pump by disconnecting switch QS5.