CN2422475Y

CN2422475Y - Negative pressure graphite magnetic sealing device for centrifugal pump shaft

Info

Publication number: CN2422475Y
Application number: CN 99244123
Authority: CN
Inventors: 张洪良
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-09-02
Filing date: 1999-09-02
Publication date: 2001-03-07
Anticipated expiration: 2009-09-02

Abstract

The utility model is used for the seal of centrifugal pump shafts. The sealing structure is led into a pump inlet through a pump body 2 and a pressure water passing through pipe arranged in a gap of a shaft 8. Thereby, the pressure of the pressure water in the area is reduced, and a first sealing area A is formed. A skeleton oil seal E, a graphitic ring 6 and motor oil 3 form a second sealing area B. The skeleton oil seal E, the graphitic ring 6, the motor oil 3, a permanent magnet ring 5 and an iron ring 7 form a third sealing area C. The skeleton oil seal E and a grease lubricant K form a fourth sealing area D. The four sealing areas form a sealing device. The problem that the sealed pressure of such seal is low is overcome.

Description

Centrifugal pump shaft negative pressure graphite magnetic seal device

The utility model belongs to machinery manufacturing technology field, is to be used for the centrifugal water pump shaft sealer.

Existing centrifugal pump water pump spindle with sealing the most frequently used have two kinds, the one, packing seal, this type of seals low, the poor performance of cost.The 2nd, mechanical seal, good seal performance, technical requirements height, cost height, seals developing magnetic seal, but some technical problem is overcome a difficulty in the industry both at home and abroad in recent years, promote limited, model utility " centrifugal pump shaft graphite magnetic seal device " 94225265.9, reality with in new development has been arranged.How not low pipe pressure is in pump type seal, and pump chamber all has pressure, and sealing is exactly the working pressure of pump in other words, and above-mentioned sealing is restricted in high-pressure water pump sealing use.

The purpose of this utility model provides a kind of magnetic seal performance that has, and can be used for higher pressure range again, the water pump spindle seal arrangement.

The concrete practice that this reality is novel, the seal arrangement branch

Four districts, the rotating shaft and the pump housing of first district's practice pump leave less gap, in this district, open a hole and the positive pressure water in the gap is guided to the import of pump by pipe, because the import of pump is a negative pressure water, what so give just normal pressure that later three seal areas stay or the solution of negative pressure water Hou San district is rotating shaft sealing reliability and life problems, all use skeleton glue oil seal in all rotating shafts place of automobile gearbox, and turn round kilometer up to ten thousand and do not leak.Mainly containing two selects: the one, do not had pressure by the sealing liquid body, and the 2nd, the machine oil that seals has lubricity.Stress problems first district is to solve.Two what solved is lubrication problem, adds the graphite circle again one when adding machine oil between two outside framework oil seals, makes oil sealing and axle increase a lubricity.Improve working life, outside the 3rd district's practice is identical with second district's practice, increase permanent magnet ring, iron hoop, add machine oil and in the middle of iron hoop and magnet, add the graphite circle simultaneously, the graphite circle is in the middle of iron hoop and magnet ring, graphite annulus is in permanent impaction state under the effect of magnetic force, solved the problem that graphite reduces in the long-time running machine oil, have only three institute's composition magnetics, it is the effect that other structure does not have, add spacer ring in second district and the 3rd interval, porosely in the ring in pump running, add machine oil, guarantee that the sealing running is with oil.Outside framework oil seal is put in the 4th district in the sealing cover, in the outside framework oil seal grease-added with spool between prevent that foreign matter from entering in the Seal cage, the whole practices of this seal arrangement that Here it is.

The utility model sealability is reliable, long service life.

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

Accompanying drawing 1 is a schematic representation of the present utility model;

Accompanying drawing 2 is sectional views of the present utility model.

This seal arrangement divides four seal areas, the first seal area , second seal area The 3rd seal area , the 4th seal area

1, pump impeller, 2, the pump housing.

The first seal area  leaves less clearance between the pump housing 2 and rotating shaft 8, open a hole herein, by the pipe H pressure water is guided to pump inlet because import water is negative pressure, make the axle with pump housing gap in water become normal pressure or negative pressure.This kind practice water herein reaches the effect that reduces and eliminate pressure.Constituted the first seal area  thus, second seal area Assemble (first anti-dress during high pressure) by two directions of outside framework oil seal E in pump chamber, add graphite circle 6 between oil sealing, add machine oil 3 between the oil sealing, axle 8 is at machine oil 3, and it is very little to wear and tear under the lubricating condition of graphite circle 6, constitutes second seal area thus The 3rd seal area , by between two of the outside framework oil seal E permanent magnet ring 5 is arranged, iron hoop 7 graphite circles 6, machine oil 3 is formed, because of permanent magnet ring 5 has permanent magnetism, graphite annulus is subjected to iron hoop 7, magnet ring 5 to compress graphite circle 6 under the effect of this power, is sealed on the axle 8, and it is lubricated that organic oil 3 is gone back in the centre, as long as permanent magnetism exists the sealing of graphite circle just to exist forever, the difference of this district's sealing that Here it is, this kind practice has solved lubrication problem, and good durability is arranged.In second district And add spacer ring 4 between the 3rd district , have than large space between spacer ring 4 and the axle 8, refuel 3 in the space, pump is opened screw in the running and is added machine oil 3, replenishes the machine oil in the running.The 4th seal area

Form by adding profit fat K between dress outside framework oil seal E in the sealing cover and the axle 8, prevent that foreign matter from entering in the Seal cage.

From above structure: this seal arrangement has only outside framework oil seal, graphite circle, permanent magnet ring, iron hoop, machine oil, lubricating grease, sealing material commonly used has constituted well behaved seal arrangement, its maximum characteristics are to seal the elevated pressures water pump spindle, the utility model cost simple in structure is low, can be used for the centrifugal pump shaft sealing of existing machinery stuffing box packing sealing.

Claims

1. a centrifugal pump shaft negative pressure graphite magnetic seal device is followed successively by the first seal area , second seal area

The 3rd seal area , the 4th seal area

It is characterized in that: gapped between the pump housing (2) at the first seal area  place and the axle (8), the pump housing herein has a hole on (2), and pipe H one end is connected with the hole, and the other end is in pump inlet place; Second seal area Between the pump housing (2) at place and the axle (8) outside framework oil seal E, graphite circle (6) are arranged; There are outside framework oil seal E, graphite circle (6) in the 3rd seal area place, also has permanent magnet ring (5) and iron hoop (7), and graphite circle (6) is between permanent magnet ring (5) and iron hoop (7); The 4th seal area

There is outside framework oil seal E at the place.