CN2076625U

CN2076625U - High-temp.-proof mechanical sealing device

Info

Publication number: CN2076625U
Application number: CN 90221154
Authority: CN
Inventors: 刘志国; 李小瓯
Original assignee: Hefei Universal Machinery Inst Ministry Of Machine-Building And Electronics In
Current assignee: Hefei Universal Machinery Inst Ministry Of Machine-Building And Electronics In
Priority date: 1990-10-04
Filing date: 1990-10-04
Publication date: 1991-05-08

Abstract

The utility model relates to a high temperature proof mechanical sealing device, which is a mechanical seal device with a special structure and special materials. A special driving pawl with a hook is used for conducting the precompression of the spring for making assembly more convenient, and a torque required by a sealing work bristle can be effectively transferred. A wedge-shaped auxiliary sealing cushion 7 made from special materials makes the sealing bear the high temperature. The utility model relates to a balanced mechanical sealing and can be used for unbalanced type seal such as rotary machine shaft sealing.

Description

High-temp.-proof mechanical sealing device

The utility model is a kind of mechanical seal device, is particularly suitable for doing balanced mechanical seal, also can be used for the sealing of rotating machinery rotating shaft.

General mechanical seal is now adopted mazy type more, is got rid of contact or noncontact seal patterns such as oil catch circle, felt, rubber seal, preceding two kinds of patterns, owing to and have the gap between the transmission shaft, at high temperature, along with the Seal cage pressure medium raises, viscosity reduces, oil-proof unavoidably; Though then two kinds of seal rings can cooperate with rotating shaft closely, after date can or produce distortion because of frictional heating during one section of hot operation, also influence sealing effect.

The purpose of this utility model is that a kind of structure, resistant to elevated temperatures mechanical seal of improvement that has will be provided.

The utility model adopts a kind of transmission bluff piece of buckle, and it can transmit Operating torque, and can produce precompression to Sealing; The utility model also adopts a kind of wedge shape auxiliary seal pad made from special material, and at high temperature, it can increase sealing force with the rising of sealed medium pressure; The utility model also adopts the reinforcement steel bushing, reduces the distortion of Sealing-graphite annulus, can run well down to guarantee high pressure.

Owing to adopt technique scheme, the mechanical seal that the utility model provides can guarantee under high temperature, high pressure that not only rotating shaft runs well, and easy to assembly.

Further introduce structural feature of the present utility model below in conjunction with accompanying drawing.

Accompanying drawing 1 is embodiment of the present utility model;

Accompanying drawing 2A, B are the assembly methods of buckle driving component;

Accompanying drawing 3 is fit angle;

Accompanying drawing 4,5,6,7,8A, 8B are different inside and outside steel sleeve assembling patterns.

A kind of novel resistant to elevated temperatures mechanical seal structure that provides according to the utility model, as shown in Figure 1: part 1-spacing ring, part 2-holding screw, 3-wedge shape auxiliary seal pad, 4-axle sleeve, 5-Compress Spring, the 6-throw-out collar, 7-wedge-type seal pad, 8-transmission screw, 9-rotating ring group sealing ring, 10-stationary ring group sealing ring, 11-stationary ring sealing ring, the 12-stop pin, 13-strengthens Steel bushing, the 14-graphite annulus.

The driving pawl of part 6 can be 2,3,4,5,6 and ascertain the number as required that shape is that the sheet band colludes, and uniform on circumference, assembling process is seen Fig. 2. When applying certain axial force, driving pawl is strutted and is slided vertically, simultaneously, driving pawl will produce a small deformation, after being seated, driving pawl is by the elastic recovery of self, and on the little trough rim that is hooked on part 4 grooves, these little hooks hook and can bear certain axial force behind the trough rim and can slippage not go out groove, the axial force that the axial force that can bear produces much larger than spring, thereby spring is compressed, the function of little hook only is pretensioned spring, and convenient sealing assembling is when the sealing normal operation, there is certain gap on the both sides of little hook and groove, seal the factor of floatability and nose balance ability to avoid exerting an influence. The annular boss of part 4 at the A place has the groove consistent with driving pawl number and calibration, during part 4 rotation, but drivening piece 6 rotate together, and can produce enough driving torques, the normal operation that assurance seals.

Wedge shape auxiliary seal pad 7 with certain angle and shape, its profile is seen Fig. 3, after the assembling of finishing on the rotating machineries such as being sealed in pump, because the effect of spring force, lip at wedge shape auxiliary seal pad can produce initial sealing power, and becomes the sealing of paying of mechanical seal. When the annular seal space pressure medium raises, because the relation of wedge shape auxiliary seal pad angle and shape, wedge piece will produce the self-tightening effect, the pressure that is annular seal space is higher, the sealability of wedge shape auxiliary seal pad is stronger, thereby, can guarantee under high pressure normal operation of sealing.

Mechanically-sealing apparatus of the present utility model has the material of a rubbing surface (ring) to make (seeing Fig. 1 spare 14) with carbon-graphite product. Because the mechanical strength of carbon-graphite product is lower, thereby under high pressure seal face will produce bigger distortion, impact sealing normal operation, as shown in Figure 4, sealing ring is adopted the inside and outside measure of strengthening, namely outer edge liner steel bushing 13 is done like this and can be reduced the seal face distortion, guarantees under high pressure normal operation of sealing. Simultaneously, outer edge steel bushing (be that graphite annulus 14 cylindricals and steel bushing endoporus adopt interference fit, graphite annulus heat is inlayed in steel bushing) can avoid graphite annulus to skid in steel bushing.

Adopt screw element 8 to connect between part 1 and the part 4, the screw number is 3 to 10 not wait, circumference uniform distribution, part 1 is to be fixed on the running shaft by Cock screw spare 2, when part 8 tightly is screwed in a time-out with part 1 and part 4, to produce axial pressure to part 3, make part 3 produce distortion, part 3 usefulness heat-resistant materials are made, after it produces distortion, to hold tightly on axle and play the effect of mechanical seal auxiliary seal ring, cut off one of axial leakage passage, and, on axle, produce stiction, this frictional force can be transmitted certain moment of torsion, that is to say, mechanical seal required driving torque of when rotation, not to bear separately by part 2, but share together by the power that 2 and wedge shape auxiliary seal pad produce, " skidding " phenomenon that this has produced when just having been avoided under some occasion only by part 2 transmitting torques is particularly useful for high pressure-temperature, major diameter, the occasion that dielectric viscosity is higher, when part 3 usefulness metallic material are made, after having selected rational cooperation, because acting on from centering of cone match guaranteed the tram of seal drive sleeve spare 4.

Part 4 is drive sleeve that carry axle sleeve, and this makes the installation dimension of balanced seal and unbalanced type seal (when the diameter of axle is identical) in full accord.Therefore, balanced seal can be installed in the unbalanced type Seal cage, and does not need running shaft (or axle sleeve), and end cap carries out process and remould, has very made things convenient for the use of user to sealing.

Part 9, part 10, part 11 and part 12 can also adopt different structural types, to be suitable for different working condition requirements.As Fig. 5, Fig. 6, shown in Figure 7.

Graphite annulus is inlayed the inner lining steel nested structure outward and is under high pressure adopted, and for the not high occasion of pressure, also is fine with whole graphite annulus.Shown in Fig. 8 A, 8B, (change the outer edge liner graphite annulus among Fig. 7 into whole graphite annulus).

Because part 4 axle sleeve relative fixed are on running shaft, therefore limited part 9 displacement of length of spring compressed direction vertically, when pump at run duration, when having vaccuum phenomenon to produce, sealing can prevent the big displacement owing to the part 9 of finding time to cause, part 10, thereby guarantee the sealing proper functioning, that is to say that sealing has the anti-function of finding time.

Further describe by the following examples.

Embodiment:

Accompanying drawing 1 has been showed embodiment of the present utility model, and its structure is as follows:

Part 1 limited ring is made by plain carbon steel and is turned black, be fixed on the axle by screw 2, and be fixed as one by screw 8 and part 4 axle sleeves again, No. 45 steel car systems of axle sleeve 4 usefulness form, and through heat treatment, make part 3 produce distortion, part 3 is to make with Expanded graphite, because the distortion of part 3 has cut off one of axial leakage passage, and produces stiction on axle, has shared transmitting torque.

Part 6 driving pawls are sheet buckles, make with 65Mn, and reach HRc50～60 through heat treatment, uniform on part 4 axle sleeves, because of elastic force is arranged, the axial force that can bear spring 5 has on A place ring-type platform and driving pawl number and the consistent groove of calibration, therefore but drivening piece 6 rotates together, produces enough moments of torsion.

Wedge type auxiliary seal pad 7 forms with heat-resistant material manufacturings such as special Expanded graphite or carbon fibers, and when the Seal cage pressure medium raise, because the self-tightening effect of wedge type, sealing was just tight more, has guaranteed the sealing under the high pressure.

For outer edge liner steel bushing 13, be to make by No. 45 steel, tightly be enclosed within outside the carbon-graphite product material, form stationary ring group 10, reduced the distortion of seal face, guaranteed to seal proper functioning under high pressure, graphite annulus cylindrical and steel bushing have adopted interference fit.

The processing and the conventional seals of all the other parts are similar.

Claims

1, a kind of resistant to elevated temperatures mechanical seal is made up of parts such as axle sleeve, seal rings, it is characterized in that; One wedge shape auxiliary seal pad is housed in the taper hole of axle sleeve one end, on the cylindrical of the above-mentioned axle sleeve the other end, be with another wedge shape auxiliary seal pad, this sealing gasket is pressed in the taper hole of the rotary packing ring adjacent with throw-out collar by pressure spring and the throw-out collar that is installed on the axle sleeve, this rotary packing ring is equipped with carbon one graphite-seal ring with between the stationary seal ring relative with it, be shaped on a driving pawl in order to the buckle of pretensioned spring with upper edge circumference five equilibrium at above-mentioned throw-out collar one end, these driving pawls are corresponding one by one to embed in the groove of axle sleeve.

2, by the described resistant to elevated temperatures mechanical seal of claim 1, it is characterized in that: the transmission screw on the said limited ring of being adorned in the taper hole of axle sleeve one end that wedge shape auxiliary seal pad can utilize and it is adjacent is pressed on it between axle sleeve taper hole and the rotating shaft cylindrical.

3, by the described resistant to elevated temperatures mechanical seal of claim 1, it is characterized in that: said carbon-graphite seal ring can suit increases the steel sleeve of its structural strength.

4, by the described resistant to elevated temperatures mechanical seal of claim 1, it is characterized in that: the quantity of the groove on the said axle sleeve and position are corresponding with the quantity and the position of driving pawl of buckle on the throw-out collar, and its size can make driving pawl freely stretch into.