CN2050111U

CN2050111U - Differential type gas static stress sealing unit

Info

Publication number: CN2050111U
Application number: CN 89208937
Authority: CN
Inventors: 吴志远
Original assignee: Individual
Current assignee: Individual
Priority date: 1989-06-16
Filing date: 1989-06-16
Publication date: 1989-12-27

Abstract

The utility model discloses a differential type gas static stress sealing unit, belonging to the chemical field of mechanical sealing industries. A plurality of inner races are arranged in the sealing case; a plurality of balancing chambers composed of a wave-shaped sealing ring and an outer race, etc. The balancing air is pressed into the balancing chambers through the air supply hole; the pressure of a medium in the major diameter turning-over equipment is counteracted; the problems that the sealing performance is poor, and the frequency of the radial run-out in the major diameter turning-over equipment is high are solved. The utility model has the advantages of simple structure, high safety. The inner medium of the major diameter turning-over equipment of the differential type gas static stress sealing unit does not leak out.

Description

Differential type gas static stress sealing unit

The utility model is a kind of pressure reduction with classification gas static(al) sealer, belongs to the motive sealing field on the chemical machinery.

The type of existing seal arrangement has packing seal, float ring seal, mechanical seal, magnet fluid sealing, encapsulating method and devices such as the rotary seal of spiral viscosity.These seal arrangements are just relatively good less than 1 meter shaft sealing effect to diameter; because but the less axle time processing of diameter is shaped; the concentricity of axle is higher; circular runout is little; but for about 1 meter long more than the 10 meters running shaft of diameter (in the chemical plant, often having so long tube axle); above-mentioned seal arrangement just can not satisfy the production needs, if the medium in the tube axle has certain pressure or has toxicity, it is more outstanding that sealing problem just becomes.

The purpose of this utility model is to overcome above-mentioned defective, and a kind of novel differential expression is provided, gas static(al) sealer, and it can adapt to the needs of the long turning axle equipment sealing of major diameter, can guarantee not leak the requirement of (perhaps leaking less) medium again.

The purpose of this utility model is finished by following structure:

In differential expression gas static(al) seal arrangement, the inside of sealed case, several are housed by inner race respectively, bellows seal circle, outer race parts stack several balance cylinders of composition in regular turn, top in each balance cylinder, have the balance air source hole, the outside of balance air source hole is connected to by conduit, and pressure is regulated and cut down the balance air supply system of forming with source of the gas, also be equipped with by snap ring in the inside of sealed case simultaneously, hold out against screw, lock nut compresses gasket ring, screw, spring washer, hold-down ring, outer race gasket ring, the accessory that dull and stereotyped seal ring and sealing gasket are formed, the bellows seal circle is to be made by elastic material, as rubber, plastic or other material when reality is used, is specifically selected the sort of elastic material for use, the bellows seal circle will have several ripples, all need consider the characteristic of turning round equipment interior media and operating procedure temperature conditions and decides.

When the pressure of turning round equipment interior media was P, the adjustable in pressure of first balance cylinder was to P in sealed case _A, their pressure differences between the two are △ P(P-P _A=△ P ₁〉=0), we can make △ P by regulating the source of the gas balance sysmte ₁Be transferred to very little, theoretically, pressure reduction △ P ₁Even can turn down and be similar to zero, we again with second balance cylinder and first balance cylinder pressure reduction △ P ₂Also be transferred to infinitesimal, like this, the medium that leaks out first balance cylinder from turning round equipment just seldom, the turning round equipment medium that leaks into second balance cylinder from first balance cylinder just still less, the seal action of the balance cylinder by numerous differential expression just can guarantee that major diameter turning round equipment interior media is finished not leak.In this process, have partly that balanced gas leaks into the seal arrangement outside, but, leak into the external world and also can not produce bad effect because the balance source of the gas all is pressurized air or other innocuous gas, institute is so that the present invention more has practicability and feasibility.Adopting the bellows seal circle simultaneously when design is sealing gasket, makes this device can compensate and absorb the radial beat eccentricity of major diameter turning round equipment to greatest extent, guarantees the effect of sealing.

As the medium in the equipment is that toxic substance can so just can guarantee fully that the turning round equipment interior media does not leak, and reaches the purpose of this utility model with the pressure adjustment of the balanced gas of first balance cylinder than the high data of medium (toxicant) pressure.

Fig. 1 is the utility model structural representation.

The 1--outer race; 2--bellows seal circle; The 3--inner race; The 4--rotating cylinder;

The 5--snap ring; 6--holds out against screw; The 7--lock nut;

8--compresses gasket ring; The 9--screw; The 10--spring washer;

The 11--hold-down ring; The 12--sealed case; 13--outer race gasket ring;

The dull and stereotyped seal ring of 14--; 15--pressure is regulated and is cut down; The 16--sealing gasket;

17--balance air source hole; The 18--turning round equipment.

It is 1 meter that there is a diameter in certain chemical plant, and length is that 14 meters turning round equipment needs sealing, and the interior media of turning round equipment is an extremely toxic substance hydrogenation cyanogen.Internal pressure is 0.3 kilograms per centimeter, and operating temperature is about 340 ℃, uses the utility model device, adopts the rubber bellows seal pad of two ripples, and the sealed case sealing of three balance cylinders shows there is not toxic gas leakage after tested.The lip of this bellows seal pad is designed to self-styled or lip, and the lip angle is preferably 60～70.

The utlity model has following advantages: simple in structure, cheap, easy to install and use, have widely practicality and reliability.

Claims

1, differential expression gas static(al) sealer by snap ring (5), holds out against screw (6), lock nut (7) compresses gasket ring (8), screw (9), spring washer (10), hold-down ring (11), outer race gasket ring (13), dull and stereotyped seal ring (14) and sealing gasket (16) are formed, it is characterized in that in sealed case (12) several being arranged by inner race (3), bellows seal circle (2), the balance cylinder that outer race (1) stacks together in regular turn has balance air source hole (17) at the top of each balance cylinder.

2, pressure reduction with classification formula gas static(al) seal arrangement according to claim 1 is characterized in that being connected to by gas source conduit on each balance air source hole, and pressure is regulated the source of the gas balance sysmte of cutting down (15) and source of the gas composition.

3, pressure reduction with classification formula gas static(al) seal arrangement according to claim 1 is characterized in that bellows seal circle (2) is to be made by elastic material.