CN101844048A

CN101844048A - Static seal stirrer

Info

Publication number: CN101844048A
Application number: CN201010118982A
Authority: CN
Inventors: 曾沂水
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-03-08
Filing date: 2010-03-08
Publication date: 2010-09-29
Anticipated expiration: 2030-03-08
Also published as: CN101844048B

Abstract

The invention relates to a static seal stirrer. The seal of the traditional reactor stirrer used in industries such as petrochemical industry, pharmaceuticals industry, food industry, and the like is motive seal and suffers a leakage problem at different degrees, wastes raw materials and causes environmental pollution and potential safety hazard. In order to solve the problems, the invention adopts static seal instead of motive seal on the stirrer, which not only solves the leakage problem, but also causes no pollution on raw materials. A stirring shaft of the stirrer enters into a reactor through a soft sealing film which is soft and the stirring shaft can freely swing around the sealing film. When working, a stirring reducer stirs the stirring shaft to rotate through a connecting arm and a stirring paddle on the lower end of the stirring shaft stirs the raw materials. When a certain working pressure is in the reactor, a spherical bearing and a bracket are arranged above the soft sealing film.

Description

Static seal stirrer

Technical field

The agitators that equipment was equipped with such as the employed reactor of industry such as petrochemical industry, light industry, medicine, food.

Background technology

For a long time, the reactor agitator shaft that generally uses of industries such as petrochemical industry, light industry, chemical fibre, medicine, the food sealing overwhelming majority that enters the reactor place is packing seal.This sealing is unavoidably revealed, and especially with in time not compressing or change filler after a period of time, leaks even more serious.Needing the material that seals herein, generally all is inflammable and explosive, poisonous, have or even severe toxicity; The material that has has severe corrosive, and what have has a strong impulse smell.Therefore have the workshop fire protection requirement of this class material extremely tight, environmental pollution is serious, and the harm producers' is healthy, facility, building etc. in the Korrosionsmedium heavy corrosion workshop that the sealing of reactor agitator leaks out.This problem is not resolved always.Be head it off, domestic gland sealed mechanical seal appearred being used for substituting in the last thirty years, can greatly alleviate the leakiness of material with it, but it can not accomplish zero leakage herein, and the need that its sealed friction surface can not be dry grinded are set up a cover water supply or a lubricating fluid system, rubbing surface is lubricated, and the pressure in the still is played balanced action in some occasion downfeed system.Mechanical sealing mechanism is complicated, and maintenance inconvenience is installed, and does not therefore generally promote the use of so far.In this field the agitator that drives with shield electric machine and magnetic force has been arranged again for this reason, the agitator of this driven in two modes has been realized zero leakage, but mechanism's complexity, and in radome, there is the lubricated maintenance difficulty of bearing in the fixed support of shaft, supporting lubricating system the entering of this kind agitator for fear of material, also need set up the equilibrium still internal pressure of cover water supply or oil supply system and prevent that material from entering bearing arrangement, and bearing arrangement carried out cooling and lubricating, the leakage problem that has movable sealing place so again, therefore the agitator of these two kinds of type of drive is except that the high place of seal request, generally can not adopt, low at agitator speed, the place that torque is big is also inapplicable.Carbon steel is had than selecting for use easily in the material of deep-etching effect.

Below as can be seen, the sealing problem of industrial employed reactor agitator does not obtain solution fundamentally up to now.

The present invention has overcome the shortcoming of employed reactor agitator sealing in the present industry fully, and the movable sealing of agitator is become static seal, has accomplished to be zero leakage herein.

The summary of the invention and the specific embodiment

The present invention is different from traditional agitator.Traditional agitator is directly to drive shaft and stirrer paddle etc. by the blender reducer output shaft to rotate together, the material in the reactor is stirred, thereby have the movable sealing problem that is sealed into that shaft enters the reactor place.And the aperture that a diameter is 350-400mm is opened at reactor of the present invention top, with an elasticity preferably soft sealing film be covered in the aperture and be fixed on the flange of aperture and cry, the borehole jack at diaphragm seal middle part is on the shaft and be fixed on the flange on the axle.Like this in the reactor with still outward entirely thus flexible membrane separate sealing, and herein be sealed into static seal (seeing accompanying drawing 1), do not have leakage point.Self can not rotate shaft herein, and can only be that center with flexible membrane is that fulcrum can freely wave in 360 ° of directions.The shaft upper end links to each other with the speed reducer output shaft end by linking arm, and shaft and reactor center line intersect an angle.During work, reductor is stirred the shaft upper end by linking arm and is rotated around the deceleration arbor, promptly is the swing of fulcrum pitch of the laps formula with the flexible membrane central point, and the blade of shaft bottom also stirs material with regard to and then turn-taking the formula swing.The length of linking arm is determining the size of bottom stirrer paddle paddling scope.The agitator linking arm was not able to be rigidly connected with being connected of shaft upper end, must allow to produce between shaft and the linking arm relative rotatablely moving, promptly adopt bearing to connect, in this should select the rolling bearing of automatic aligning or oscillating bearing for use, overlap radial thrust bearing, require bearing herein to should bear certain axial force.

The element of most critical of the present invention is a soft sealing film, its effect:

1. to playing the seal isolation effect inside and outside the still;

2. shaft is played radial support fixation on the horizontal plane;

3. allowing shaft is that fulcrum freely swings with the center of film.

It is little that this soft sealing film must have certain flexibility and intensity and radial drawing amount, and thickness is in the 4-6mm scope.According to the character of material and operating temperature, pressure, the material of flexible membrane can be selected higher synthetic fibers canvas or the nylon cord of folder multilayer intensity in the different rubber for use.When higher, when being had corrosivity again, can select General Purpose Rubber folder stainless steel wire fiber or carbon fiber interlayer in fluorubber or the silicon rubber as the reactor operating temperature for use.Operating temperature can reach 200 ℃.

The pattern of agitator have two kinds optional: 1). the quant formula: promptly stirring arm directly is welded in the shaft lower end as ship slurry; 2). the net formula: agitator can be designed to the pattern (seeing accompanying drawing 4) of family expenses egg-whisk, the agitator consumed power of this pattern and not very big but mixing effect ideal.

The agitator balance of axial force:

Soft sealing film only plays the radial support effect to shaft, and the deadweight of agitator is born by top stirring alkali speed machine.In reactor operating pressure hour, flexible membrane can bear certain pressure, and the axial force that makes progress that agitator produces is also born by reductor by linking arm.When operating pressure in the reactor was big slightly, soft sealing film can be born bigger tension force, the flexible reduction, and power of agitator can increase, and the axial force that shaft makes progress also can be very big, at this moment then can not depend merely on reductor and linking arm has been born this axial force.Increase by one spherical bearing and support (seeing accompanying drawing 3) on soft sealing film in the case, the centre of sphere of spherical bearing is the center of soft sealing film.To bear the axial force that this makes progress.When being high negative, this spherical bearing can be propped up the below that is placed on diaphragm seal as the reactor operating pressure.Spherical bearing should adopt oil-free lubrication, and the soft high-abrasive material of convex surface hard material, concave surface is as graphite impregnation polytetrafluoroethylene etc.This spherical bearing itself also is a kind of self-energized seal device, when flexible membrane is in a single day damaged, can play interim sealing function.

The preliminary of reactor operating pressure determined:

Most reactor actuating pressure all is low pressure or normal pressure in the work, the operating pressure that static seal stirrer of the present invention is fit to: tentatively draft and be≤0.2MPa, when if operating pressure is higher, flexible membrane can bear higher tension force, the flexible reduction can increase power consumption, and spherical bearing also can bear very big pressure simultaneously, equally also can increase power consumption, also increase the breakage of bearing simultaneously.Should in the cavity between soft sealing film and the spherical bearing support, introduce the compressed air that equates with operating pressure in the reactor for this reason, in order to the pressure in the balanced reaction still, the problems referred to above that produce because of operating pressure is higher with solution.

Advantage of the present invention:

1. agitator is become static seal from traditional movable sealing, thoroughly solved the leakage problem of movable sealing, accomplished zero leakage;

2. simple in structure, I﹠M is convenient;

3. be suitable under 200 ℃ of temperature, various corrosive medium environment are work down, is line with rubber, lining fiberglass, enamel etc. as reactor, and agitator of the present invention also can serve as a contrast identical material accordingly;

In the work no any dirt because of wearing and tearing generations of etc.ing enter reactor (as packing seal, machine secretly seal, shield electric machine driving, magnetically-actuated all have in various degree the greasy dirt that is produced because of wearing and tearing etc. enters reactor), guaranteed that material in reactor is not subjected to any material, even the pollution of the material of trace, this produces particularly important for pharmacy, biochemical product, food etc.

5. agitator can be directly enters in the still from the aperture at reactor top, need reactor not made removable tank body and lid or increase the maintenance manhole for the maintenance agitator is installed.

The place that the present invention is not suitable for using:

1. require the local inapplicable of the necessary high speed rotating of agitator;

2. the local discomfort that requires to adopt special shape agitators such as frame or anchor formula to be suitable for is used the present invention;

3. the place of operating temperature＞200 ℃ operating pressure＞0.5MPa should not be used.

The present invention should possess certain axial bearing capacity to the speed reducer output shaft of being joined, and does not have other specific (special) requirements.

Description of drawings

Fig. 1 is the total figure of static seal stirrer of the present invention (comprising reactor);

Fig. 2 is an I portion enlarged drawing among total figure;

Fig. 3 is spherical bearing and spherical bearing support;

Fig. 4 is net formula agitator figure.

Claims

1. static seal stirrer mainly is made up of stirring reductor, agitator linking arm, shaft and paddle, soft sealing film, spherical bearing, spherical bearing support.Stirring reductor is general general vertical cycloidal planetary gear speed reducer, but should bear certain axial force, and the output shaft end structure should be by requirement processing of the present invention.

2. diameter is arranged is the aperture of 350-400mm at the reactor top, and soft sealing film is topped in the aperture, is fixed on the flange of aperture by flange.Shaft is fixed by flange and diaphragm seal on the axle by the hole at gentle domestic animal diaphragm seal middle part, and shaft enters reactor and just do not had the problem of movable sealing like this.Shaft can not rotate at this, can only be that fulcrum can 360 ° of directions freely swing with the diaphragm seal center.Stir speed reducer output shaft during work and stir the rotation of shaft upper end by stirring linking arm, the paddle of shaft lower end is drawn stirring like the circle to material in reactor.

3. the material of soft sealing film is selected folder multilayer nylon cord or canvas of chemical fibre in the different rubber for use according to the performance of operating temperature and material, can select flexible materials such as pressing from both sides carbon cloth in silicon sample glue, the fluorubber under the high temperature for use, and its thickness is 4-6mm.Acting as of soft sealing film:

1). it will be isolated inside and outside the reactor, plays the effect of static seal;

2). it plays the supporting role of (radially) on the horizontal plane to shaft, but but it again Free Transform allow shaft to freely swing.

Require soft sealing film flexibility good (being that the anti-crawl agentdefiection folding endurance is good), intensity height, radial drawing amount little herein; Bear the interior operating temperature of reactor and the corrosion of material etc.

4. stir the non-rigid connection that is connected of linking arm and shaft upper end, insert in the bearing of linking arm end the shaft upper end, and this bearing is to overlap radial thrust bearing in automatic aligning rolling bearing or the oscillating bearing.The length that stirs linking arm determines the scope that stirrer paddle stirs in reactor.Stirring linking arm should bear the deadweight of agitator and produces top power upwards because of the pressure in the reactor makes shaft.

5. agitator You both kinds pattern of shaft bottom: the quant formula directly is welded on the axle; Net formula (family expenses egg-whisk formula).

6. when the reactor operating pressure is higher than 0.02Mpa, be equipped with spherical bearing and spherical bearing support above diaphragm seal, the centre of sphere of spherical bearing is the center of soft sealing film.The convex surface of spherical bearing adopts hard wear-resistant material, and concave surface adopts the soft material of nonmetal oil-free lubrication, and embeds in the spherical bearing support.Spherical bearing is born the top power that makes progress that shaft is produced because of the operating pressure in the reactor on the one hand, simultaneously good sealing function is played in the space between diaphragm seal and spherical bearing support.For overcome because of operating pressure in the reactor big, cause the soft sealing film overtension, the flexible reduction, and the contact stress of spherical bearing is excessive, feed the compressed air that equates with reacting kettle inner pressure in the cavity between diaphragm seal and support, with the pressure in the balanced reaction still.If the operating pressure in the reactor is a high negative, spherical bearing and be placed on the diaphragm seal below.

Cause that for overcoming the spherical bearing contact stress is excessive because of reactor work pressure is excessive, cause power consumption big, spherical bearing heating and wearing and tearing are quickened, and can take measures from design in the place that shaft is connected with linking arm, allow the stirring reductor bear section axial power.