CN101844048B

CN101844048B - Static seal stirrer

Info

Publication number: CN101844048B
Application number: CN2010101189826A
Authority: CN
Inventors: 曾沂水
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-03-08
Filing date: 2010-03-08
Publication date: 2013-06-12
Anticipated expiration: 2030-03-08
Also published as: CN101844048A

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 agitator that the equipment such as reactor that the industries such as petrochemical industry, light industry, medicine, food are used are equipped with.

Background technology

For a long time, the reactor agitator shaft that generally uses of the 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 after a period of time or changing filler, leaks even more serious.Needing herein the material that seals, is all generally inflammable and explosive, poisonous, have or even severe toxicity; Some materials have severe corrosive, have with the 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 leaks out from the reactor stirrer seal.This problem is not resolved always.Be head it off, the domestic appearance in the last thirty years is used for substituting gland sealed mechanical seal, can greatly alleviate the leakiness of material with it, but it can not accomplish zero leakage herein, and its sealed friction surface is not competent

Some need set up that a cover supplies water or the lubricating fluid system, rubbing surface is lubricated, and in some occasion downfeed system, the pressure in still is played balanced action.Mechanical sealing mechanism is more complicated, and therefore installation and repairing inconvenience generally do not 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 is complicated, and in radome, there is the lubricated maintenance difficulty of bearing in the fixed support of shaft, supporting lubricating system the entering for fear of material of this kind agitator, also need set up the equilibrium still internal pressure of a cover water supply or oil supply system and prevent that material from entering bearing arrangement, and bearing arrangement is carried out cooling and lubricating, there is so again the leakage problem of movable sealing place, therefore the agitator of these two kinds of type of drive is except seal request high place, generally can not adopt, low at agitator speed, the place that torque is large is also inapplicable.Carbon steel is had than selecting easily in the material of deep-etching effect.

More than can find out, the sealing problem of the industrial reactor agitator that uses does not obtain solution fundamentally up to now.

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

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 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 in and cry on the flange of aperture, the borehole jack at diaphragm seal middle part is on shaft and be fixed on flange on axle.Like this in 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 can freely wave in 360 ° of directions take the center of flexible membrane as fulcrum.The shaft upper end is connected 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 reductor shaft, namely take the swing of flexible membrane central point as fulcrum pitch of the laps formula, the blade of shaft bottom also just and then Circling type swing and material stirred.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 linking arm relative rotatablely moving, namely adopt bearing to connect, should select rolling bearing or the oscillating bearing inner sleeve radial thrust bearing of automatic aligning at this, require bearing herein to should bear certain axial force.

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

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

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

3. allow shaft to freely swing take the center of film as fulcrum.

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 different higher synthetic fibers canvas or the nylon cords of rubber inner clip multilayer intensity.When as higher in the reactor operating temperature, when being had corrosivity again, can select General Purpose Rubber fluorubber or silicon rubber inner clip stainless steel wire fiber or carbon fiber interlayer.Operating temperature can reach 200 ℃.

The pattern of agitator have two kinds optional: 1). the quant formula: namely 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, and the agitator consumed power of this pattern is also not very big but mixing effect desirable.

Stirrer shaft is to equilibrium of forces:

Soft sealing film only plays the radial support effect to shaft, and the stirring alkali speed machine of top of the deadweight of agitator is born.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 reactor was slightly large, soft sealing film can be born larger tension force, the flexible reduction, and power of agitator can increase, and the axial force that shaft makes progress also can be very large, at this moment 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.The axial force that makes progress to bear this.When being higher negative pressure as the reactor operating pressure, this spherical bearing can be propped up the below that is placed on diaphragm seal.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 is also 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:

In work, most reactor actuating pressure is all low pressure or normal pressure, 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 large pressure simultaneously, equally also can increase power consumption, also increase the breakage of bearing simultaneously.Should introduce the compressed air that equates with operating pressure in reactor in the cavity between soft sealing film and spherical bearing support for this reason, in order to the pressure in the balanced reaction still, the problems referred to above that produce because 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. being suitable for working under various corrosive medium environment at 200 ℃ of temperature, 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;

4. enter reactor (as secretly in packing seal, machine seal, shield electric machine driving, magnetically-actuated all have in various degree the greasy dirt that produces because wearing and tearing etc. enter reactor) without any dirt because of wearing and tearing generations of etc.ing in work, 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 still from the aperture at reactor top, need to reactor not made removable tank body and lid or increase the maintenance manhole for the installation and repairing agitator.

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

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

2. require to adopt the local discomfort that the special shape agitators such as frame or anchor formula could be suitable for to use 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 joining, without 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 I section enlarged drawing in total figure;

Fig. 3 is spherical bearing and spherical bearing support;

Fig. 4 is net formula agitator figure.

Claims

1. static seal stirrer, mainly by stirring reductor, the agitator linking arm, shaft and paddle, soft sealing film, spherical bearing, the spherical bearing support forms, diameter is arranged at the reactor top is the aperture of 350-400mm, soft sealing film is covered in the aperture, be fixed on the flange of aperture by flange, the borehole jack at soft sealing film middle part is fixed in shaft and with the flange on shaft, the shaft upper end is connected with stirring speed reducer output shaft end by the agitator linking arm, shaft and reactor center line intersect an angle, stirring reductor stirs the shaft upper end by the agitator linking arm it is rotated around reductor shaft, shaft is done the swing of pitch of the laps formula take the soft sealing film central point as fulcrum, the blade of shaft bottom also just follows Circling type swing and material is stirred, when the reactor operating pressure during higher than 0.02Mpa, described spherical bearing, the spherical bearing support is arranged at the top of soft sealing film, if the operating pressure in reactor is higher negative pressure, spherical bearing and be placed on the diaphragm seal below, the centre of sphere of spherical bearing is the center of soft sealing film, has cavity between described diaphragm seal and spherical bearing support, and described cavity is used for passing into the compressed air that equates with reacting kettle inner pressure, with balanced reaction still internal pressure.

2. static seal stirrer according to claim 1, it is characterized in that: described agitator linking arm is connected with shaft upper end employing bearing, insert in the bearing of agitator linking arm end described shaft upper end, and described bearing is automatic aligning rolling bearing or oscillating bearing inner sleeve radial thrust bearing.

3. static seal stirrer according to claim 1, it is characterized in that: described stirring reductor is vertical cycloid pinwheel reduction gear.