CN101769386A

CN101769386A - High-temperature exhaust gas valve with reversible valve disc

Info

Publication number: CN101769386A
Application number: CN200910197544A
Authority: CN
Inventors: 闫念华; 赵建斌; 唐勇; 余炅; 孙晔
Original assignee: 704th Research Institute of CSIC
Current assignee: 704th Research Institute of CSIC
Priority date: 2009-10-22
Filing date: 2009-10-22
Publication date: 2010-07-07

Abstract

The invention relates to a high-temperature exhaust gas valve with a reversible valve disc, which is mainly used for solving the technical problems of valve tightness at high temperature and the like. The invention adopts the technical scheme that a valve disc with a combined seal is arranged inside the valve chamber of the valve, and a reversible mechanism one end of which is connected with the valve while the other end is articulated with the valve disc is arranged inside the valve chamber. The valve is a poppet valve adequate for bi-directional sealing for high-temperature exhaust gas and corrosive liquid.

Description

High-temperature exhaust gas valve with reversible valve disc

Technical field:

The present invention relates to a kind of poppet valve, the particularly assembly of this poppet valve with pivoted dish.

Background technique:

At present, chemical plant high-temp waste gas toxic gas filtration system, discharge of submersible diesel exhaust and drainage system and other similar systems, all need equip necessary poppet valve in these systems, and all there is the seal leakage problem in these poppet valves, the maintenance rate height, maintenance load is big, its reason is: operating mode is abominable, exhaust gas valve runner one end is a high-temp waste gas, the other end is that tool is than severe corrosive solution or seawater, high-temp waste gas has carbon deposit, sulphide, how tar for the heavy caliber exhaust gas valve, solves sealing configuration, all there are a large amount of problems in material and working method; At above-mentioned requirements, Chinese patent CN2252922 proposes a kind of pressurising seal ball-valve, belong to hot-resistant valve, by valve body, valve gap, flap, Sealing and pneumatic mechanism are formed, and its flap is established an annular sphere plate on the periphery of last lower disc, and are one with valve petal body, on the annular sphere plate, be provided with wearing layer, its advantage is to reduce flap weight and rubbing surface, increases solid material circulation area, and is high temperature resistant, wear-resistant, corrosion-resistant, and tool excellent sealing, but it closes, closing mechanism is simple rotation, and sealing is difficult to owing to active force is inhomogeneous guarantee its structural maintenance inconvenience, cooling system also is difficult for guaranteeing, is suitable for the range limited of high temperature media; European patent EP 1853837 discloses a kind of high temperature fluid valve, this valve comprises inlet, outlet, ball element and sealing are formed, valve is provided with eccentric shaft and controls ball element rotation and reach behind the desired location and black box touches, its black box comprises housing, primary seal and resilient member, its resilient member can be with primary seal deflection bears against ball element, realize excellent sealing, but this technological scheme is utilized eccentric rotary pressing sealing surface, active force deflection, sealing are difficult to guarantee that its resilient member can slightly improve sealing surface and engage, but DeGrain, and making complex structure, the total maintenance is difficulty relatively, and is difficult to adapt to high temperature.

Summary of the invention:

Technical problem to be solved by this invention is, a kind of improved high-temperature exhaust gas valve with reversible valve disc is provided, and it can adapt to elevated-temperature seal, can prolong seal durability, and maintain easily.

The technological scheme that the present invention solves the problems of the technologies described above employing is: high-temperature exhaust gas valve with reversible valve disc includes valve body and valve disc, be characterized in: the valve disc that band group formula sealing is set in the valve pocket of valve body, in this valve pocket, also be provided with one and order about the switching mechanism that valve disc is made flip-flop movement, one end of this switching mechanism is connected with valve body, and the other end of switching mechanism is hinged with valve disc.Switching mechanism orders about the valve disc plane and does 90 ° upset displacement, realizes the keying function of valve.

Hard, soft two soft seals that combined labyrinth and carbon gland includes; Establish folding valve gap on the valve body; The valve strength water cavity that the tool refrigerating function is arranged on the valve body; The valve gap water cavity that the tool refrigerating function is arranged on the valve gap.

The present invention adopts combined labyrinth and carbon gland and mutually cold measure, and in the driving sealing force of close stance power source (switching mechanism), fundamentally solve high-temp waste gas and circulation of corrosive fluid medium and seal leakage problem on the big specification exhaust gas valve, combined labyrinth and carbon gland not only has excellent sealing, and can obviously prolong its working life with and the setting of valve gap can improve the maintenance condition of valve greatly.

Description of drawings:

Fig. 1 is that high-temperature exhaust gas valve with reversible valve disc vertical profile of the present invention is looked schematic representation.

Fig. 2 is a local enlarged diagram among Fig. 1.

Fig. 3 is that switching mechanism part axle is surveyed schematic representation among Fig. 1.

Embodiment:

With reference to Fig. 1, high-temperature exhaust gas valve with reversible valve disc includes valve body 1, valve disc 2 and switching mechanism 3.

Valve body 1 is made up of body and valve gap two major parts, as shown in Figure 1, and wherein:

Temperature end 11 is waste gas ends of valve body 1, and its flange is connected in exhaust duct, and temperature of waste gas can reach 250 ℃ on it, and relevant pressure is 0.1MPa;

Valve neck water cavity 12, its formation is to establish a bulge loop sheet at the nearly valve face of adpting flange place, and connect shrouding 121 at its Zhou Bian Soldering, thereby form an annular housing 122, this annular housing 122 is connected with cooling water supply pipe, can directly cool off, can improve sealing effect, can prolong the working life of soft seal again the soft seal that is bonded on valve face;

Valve gap 13 is the composite structures that can roll over, and the shape that can fit with the valve face of valve disc 2 is made in its bottom surface, favourable sealing cooling and to the maintenance of each member in the valve pocket 16;

Valve gap water cavity 14 in the end face solid welding one plate-like capping 141 of valve gap 13, thereby forms cavity 143, is installed with two mouths of a river 142 in capping 141, and in order to the turnover for cooling water, the valve gap water cavity can cool off the valve disc 2 of opening state;

Vent 15 is installed on the valve gap 13, and during the valve complete opening, valve disc 2 sealing surfaces are sealed vent, the cooling of favourable sealing surface, and high-temp waste gas can not enter vent 15 during exhaust, guarantees personal security, can be used to detect the tightness of valve when valve cuts out;

Corrosive liquids end 17, this end flange connects the pipeline of carrying corrosive liquids, and its phase working pressure can reach 3.0MPa.

Valve disc 2 includes hard sealing 21, soft seal 22 and disk body 22, as shown in Figure 2, and wherein:

Hard sealing 21 is to be made by refractory metal, as various model heat-resistance stainless steels or other similar materials; Ring body 211 external side brims of hard sealing 21 are formed with inward flange 212, the inner peripheral surface of this inward flange 212 be able to be located with 232 engagings of disk body 23 locating flanges, the periphery of ring body 212 digs and is provided with one group of through hole 213, and through hole 213 wears bolt 24, can be fixed on the disk body 23 sealing 21 firmly; Be formed with an outward flange 214 in inward flange 212 outsides, in order to blocking soft seal 22; Opposite side at outward flange 214 is formed with annular sealing surface 215, the cross section of sealing surface 215 is triangular in shape, gable top has the roundlet arc to connect, when soft seal 22 because wearing and tearing or other factors when damaging, the gable top that highly is lower than soft seal 22 will contact with the valve face 18 of valve body 1, realize the replacement seal function, the not only sealing function of maintaining valve, and the actual life that prolongs valve;

Soft seal 22, be to make by high-temperature resistant rubber, also can adopt the new type rubber soft sealing material, serviceability temperature can reach 250 ℃, inward flange 212 peripheries of its inner ring surface 221 and hard sealing 21 cooperate, its locating slot 222 seals 21 inward flange 212 peripheries cooperation again and firmly, its locating slot 222 is chimeric with the outward flange 214 of hard sealing 21 again, its ring limit 223 proper inlay cards are at the wedge shape inner ring surface 233 of disk body 23, when bolt 24 passes through hole 213 and is screwed in the disking body 231 of disk body 23, soft seal 22 will have extremely good assembling condition under the clamping of hard sealing 21 and disk body 23; The key structure of soft seal 22 is sealing anchor rings 224, and for guaranteeing to have excellent sealing, the substrate cross section of sealing anchor ring 224 is trapezoidal, and is curved at this trapezoidal top, and not only individual have excellent sealing, and wear-resistant;

Disk body 23, comprise structures such as disking body 231, locating flange 232 and wedge shape inner ring surface 233, the screw of establishing and seal firmly 21 through holes, 213 correspondences on the disking body 231 is with fixing hard,

soft seal

21,22, the one-body molded seat of valve 234 that the valve disc axle 33 that can stretch through is arranged in the middle part of disk body 23, but on seat of valve 234, extend the fixed body 235 of fixed guide 34.

Switching mechanism 3 includes live axle 31, U type lever 32, valve disc axle 33, guide rail 34 and the axis of guide 35, shown in Fig. 1,3, wherein:

Live axle 31 is axis bodies always, and its two ends are bearing in respectively on the bearing of valve body 1, and the one end can connect prime mover (figure does not show), and this prime mover can be motor, oil hydraulic motor or other similar power engines;

Can stretch through live axle 31 and be to drive and connect of U type lever 32, its U type bottom is as drive mechanisms such as key, pins, its two arm and bottom moulding are one, and vertical with bottom (being the shaft center line), promptly two arms and live axle 31 center lines are on same plane, and the free end of two arms is provided with through hole;

Valve disc axle 33 is axis bodies always, and its two ends are extended through through hole on 32 liang of arm free ends of U type lever, can be stationary state, and valve disc axle 33 and live axle 31 the two center line are at grade and be parallel to each other;

Guide rail 34, one end (being fixed end) are made the fitting recess that the fixed body 235 with valve disc body 23 cooperates, and assembling rear rail 34 is cantilever type and is fixed on the valve disc body 23, offers guide groove on the overhanging section of guide rail 34;

The axis of guide 35 is axis bodies always, and the axis of guide 35 stretches through in the guide groove of guide rail 34 and is and is slidingly matched, and its two supports is on bearing, and bearing fixing is at valve body 1, or directly is fixed on valve body 1;

The valve closed state is as Fig. 1, under the effect of switching mechanism 3, when closing, driving force acts on valve disc 2 positive centers through live axle 31, U type lever 32, valve disc axle 33, and extremely favourable sealing contacts with valve face, cooperates combination seal to make the present invention can obtain the optimum state in the high-temp waste gas valve again.

The opening of valves state, shown in Figure 3 is the process of its unlatching, and reach valve full open state position shown in the dotted line of Fig. 1 at last, valve disc 2 is under switching mechanism 3 rotates, by

U type lever

32,2 motions of drive valve disc, valve disc 2 is under the guide groove and the axis of guide 35 synergy of guide rail 34 simultaneously, in vertical state at last, the sealing surface of valve disc 2 is affixed to valve gap 13 bottoms, both avoid directly washing away of high-temp waste gas, and can obtain the promptly cold of valve gap water cavity 14 interior cooling waters simultaneously again, improved the operating conditions of soft seal 22, prolong the working life of valve, improve the maintenance condition of valve.

Claims

1. high-temperature exhaust gas valve with reversible valve disc, comprise valve body and valve disc, it is characterized in that: the valve disc (2) that in the valve pocket (16) of valve body (1), is provided with a band combined labyrinth and carbon gland, in this valve pocket (16), also be provided with one and order about the switching mechanism (3) that valve disc (2) is made flip-flop movement, one end of this switching mechanism (3) is connected with valve body (1), and the other end of switching mechanism is hinged with valve disc (2).

2. high-temperature exhaust gas valve with reversible valve disc according to claim 1, the disk body (23) that it is characterized in that valve disc (2) is arranged with hard sealing (21) and is embedded with soft seal (22), disk body (23) is fixed with hard sealing (21), hard sealing (21) pressing and fixing soft seal (22).

3. high-temperature exhaust gas valve with reversible valve disc according to claim 2, the cross section that it is characterized in that hard sealing (21) annular sealing surface (215) is triangular in shape, the cross section of the ring surface (224) of soft seal (22) is curved, and the height of hard sealing (21) is less than the height of soft seal (22).

4. turning valve disc high temperature air valve according to claim 2 is characterized in that the material of hard sealing is a refractory metal, and the material of soft seal is that operating temperature can reach 250 ℃ high-temperature resistant rubber.

5. turning valve disc high temperature air valve according to claim 1, it is characterized in that switching mechanism (3) includes live axle (31), U type lever (32), valve disc axle (33), guide rail (34) and the axis of guide (35), be installed with U type lever (32) on the live axle (31), U type lever (32) two arm ends are hinged with valve disc (2), be installed with guide rail (34) on the valve disc (2), be equipped with the axis of guide (35) in the guide groove of guide rail (34), the axis of guide (35) two supports has the bearing on the valve body (1).

6. high-temperature exhaust gas valve with reversible valve disc according to claim 1 or 5, the center line that it is characterized in that live axle (31) and valve disc axle (33) at grade and be parallel to each other, (320 liang of arms and live axle (31) center line are at grade for U type lever.

7. high-temperature exhaust gas valve with reversible valve disc according to claim 1 is characterized in that the temperature end (11) of valve body (1) is provided with valve neck water cavity (12), and valve gap (13) is provided with valve gap water cavity (14).

8. high-temperature exhaust gas valve with reversible valve disc according to claim 1 is characterized in that valve body (1) is provided with folding valve gap (13).

9. high-temperature exhaust gas valve with reversible valve disc according to claim 1 is characterized in that the valve gap (13) of valve body (1) is provided with ventilating hole (15).