CN2135673Y

CN2135673Y - Full-closed inner drainage no leakage pump

Info

Publication number: CN2135673Y
Application number: CN 92207500
Authority: CN
Inventors: 邱熙
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-04-11
Filing date: 1992-04-11
Publication date: 1993-06-09
Anticipated expiration: 2002-04-11

Abstract

The utility model discloses an improved centrifugal pump. The utility model is characterized in that a drainage storehouse with an inner automatic drainage system is arranged between the pump body of the centrifugal pump and an electric machine, and the inner automatic drainage system is composed of a mercury contact switch, a drainage pipe, an electromagnetic pump or a diaphragm pump, a one-way valve and a helical groove. A pump mechanical seal, a self-control inner drainage seal and a motor packing seal form a three-stage seal system. Thus, the improved centrifugal pump can achieve the zero leakage. Therefore, the utility model has the advantages of no pollution for the transporting liquid medium, small consumption, compact structure, long service life, easy installation and simple maintenance. The improved centrifugal pump can be widely used for general chemical industries and each aspect in general chemical industries.

Description

Full-closed inner drainage no leakage pump

The utility model belongs to a kind of centrifugal pump that is connected as a single entity with motor, relates to a kind of improved zero leakage pump.

Existing centrifugal pump generally adopts packing seal or mechanical seal, can't realize zero leakage, so can't satisfy the demand of carrying poisonous, harmful or the liquid medium that the eighteenth of the twenty is expensive, can't eliminate loss and pollution.In addition, in order to reduce leakage, the power loss that the friction of axle envelope causes is bigger again; Magnetic force driving pump, canned motorpump can realize not having fully leakage, but because the existence of housing, sealed wall, the magnetic field air gap is bigger, and power factor is very low, generally have only about 50%, and the cost eighteenth of the twenty is expensive, and difficult in maintenance, working life is shorter.

The purpose of this utility model just provides a kind of totally-enclosed interior drainage zero leakage pump, realizes zero leakage with lower cost and loss.

The utility model is achieved in that a sealing is set drains the storehouse between the pump housing and motor, in order to prevent to leak, the central shaft seal arrangement between the pump housing and the sealing drainage storehouse is set to a graphite bearing and a mechanical seal that matches with it; A water retaining ring and a packing seal have been adopted in the central shaft sealing that sealing is drained between storehouse and the motor, and sealing is drained the storehouse and is provided with electromagnetic pump or diaphragm pump, one-way valve, mercury contact switch, drainage tube and the viewing window that is used for drainage.Motor adopts totally-enclosed form, can prevent that ambient air and moisture from entering the pump housing through the transmission position.

Effect of the present utility model is specifically present: absolute nothing is leaked, to carrying liquid medium pollution-free, loss is little, cost low power factor height, life-span is long, aspects such as easy maintaining change and drain the product that the storehouse shape just can be produced shape and structures such as the pump top is vertical, the motor top is vertical, increase cold system and can be used in high temperature, high pressure place.

The utility model concrete structure is provided by following examples and accompanying drawing:

Accompanying drawing is the utility model structural representation.

The utility model is drained storehouse 16, motor front cover 17, packing seal 18, front and back bearings 19, rotor 20, stator 21, resin screen cover 22, rear end cover 23, motor 24 etc. by the pump housing 1, impeller 2, bearing support 3, filter layer 4, graphite bearing 5, axle sleeve 6, rotating shaft 7, the close letter 8 of pump, mechanical seal 9, water retaining ring 10, mercury contact switch 11, escape pipe 12, electromagnetic pump or diaphragm pump 13, one-way valve 14, viewing window 15, sealing and is formed.

The pump housing 1, pump seal letter 8, sealing are drained storehouse 16, motor front cover 17, motor 24, rear end cover 23 and each connecting tube, bolt and conjugation position seal ring and are formed totally-enclosed system.

Impeller 2, graphite bearing 5, axle sleeve 6, bearing support 3, pump seal letter 8, mechanical seal 9, filter layer 4 etc. are formed first order selflubricating coolant seal system.Mechanical seal 9 is quoted after filtration, and the conveying liquid after the current limliting is lubricated, and then, the spiral chute by graphite bearing 5 returns in the pump housing.Graphite bearing 5 can utilize its spiral drainage to realize contactless sealing, also can reduce the axle, the circular runout that pass axle, improves impeller 2 transfer efficiencies, improves the working life of mechanical seal 9.

Sealing is drained storehouse 16, mercury contact switch 11, escape pipe 12, electromagnetic pump or diaphragm pump 13, one-way valve 14 etc. and is formed drainage drainage sealing system in the second level.

Water retaining ring 10, packing seal 18, motor front cover 17 etc. are formed third level motor splashproof, anti-vapor sealing system.

Viewing window 15 is convenient in time pinpoint the problems and deal with, and prevents from that sealing system is drained in drainage in the excessive or second level of first order sealing system leakage rate to go wrong.

For the working life of prolonged mechanical sealing 9, reduce frictional loss, mechanical seal 9 allows to exist a certain amount of dynamic leakage, can be controlled to about 50 milliliters of per minutes, leaking the back liquid medium accumulates in storehouse 16 is drained in sealing, increase to when a certain amount of mercury contact switch 11 and connect, control transformation system start-up electromagnetic pump or diaphragm pump 13 will accumulate liquid and send back in the pump housing 1 by the spiral chute on escape pipe 12 and graphite bearing 5 inwalls.Escape pipe 12 outlets are positioned near the spiral mouth of graphite bearing 5, under the centrifugal action and spiral fluted drainage of impeller 2, outfall is in negative pressure state when work, so it is lower to the outlet pressure and the traffic requirement of electromagnetic pump or diaphragm pump 13, power has 40W enough, and its operating time is extremely short.Leakage rate as mechanical seal 9 is 50 milliliters/every clock, and it is 3000 milliliters that storehouse 16 control capacity are drained in sealing, and the power 40W of electromagnetic pump or diaphragm pump 13 then needs work one minute every one hour electromagnetic pump or 13 of diaphragm pumps.

Claims

1, a kind of totally-enclosed interior drainage zero leakage pump of being made up of the pump housing 1, motor 24 etc. is characterized in that being provided with sealing and drains storehouse 16 between the pump housing 1 and motor 24.

2, totally-enclosed interior drainage zero leakage pump according to claim 1 is characterized in that at the pump housing 1 and drains between the storehouse 16 being provided with graphite bearing 5 and the mechanical seal 9 with drainage.

3, totally-enclosed interior drainage zero leakage pump according to claim 1 and 2 is characterized in that being provided with electromagnetic pump or diaphragm pump 13, viewing window 15 and the mercury contact switch 11 that is used for drainage on sealing drainage storehouse 16.