CN2277467Y - Double end-face mechanical sealing device - Google Patents

Abstract

The utility model relates to a double end-face mechanical sealing device. A transmission sleeve is provided with a movable ring seat, and upper and lower movable rings are both driven to rotate by the transmission sleeve. Two upper and lower floatable stationary ring seats are respectively corrected by two spring supports, and the spring force acts on the stationary ring seats. The float of the stationary ring seats have the automatic compensation function. A stationary sealing end face is kept to be vertical to a rotary shaft, and the stationary sealing end face is well jointed with a movable ring end face which is always vertical to an axial line. The utility model has the advantages of uniform and reasonable stress of each sealing element, high-temperature resistance and high voltage resistance and can work under the working pressure of 0-0.6MPa and the working temperature of 250 DEG. The double end-face mechanical sealing device is especially suitable for the movable seal of the stirred tanks of the chemical engineering industry and other similar rotary machines.

Description

Double end-face mechanical sealing device

The utility model relates to a kind of mechanical seal device, particularly a kind of double end-face mechanical sealing device.Be applicable to the sealing of the higher rotating machinery of operating temperature and pressure (as the high pressure stirred tank).

Because the needs of Chemical Manufacture technology have proposed higher requirement at aspects such as working pressure, operating temperatures to mechanical seal.Double mechanical seal is a kind of combined moving seal arrangement that can meet the demands preferably, it forms seal face by media end and each a pair of dynamic and static ring of atmosphere end, seal face keeps under the elastic force effect fitting outside hydrodynamic pressure and compensation mechanism, plays seal action." Double End little spring UB type still seals with mechanism " as People's Republic of China's chemical industry standard (HG2098-91) promulgation promptly is a kind of dynamic seal apparatus that chemical industry is used that is suitable for.

Fig. 1 is the structural representation of sealing device.

As shown in Figure 1: on transmission shaft 7, be set with drive sleeve 1, one end of drive sleeve 1 is equipped with a spring seat 2, with the transmission screw with the spring seat axially locating, spring 8 is housed in the spring seat, on it, respectively there is a rotating ring 4 at following two ends, and spring force acts on respectively on the rotating ring compensation mechanism to two opposite directions vertically, spring seat drives the rotating ring rotation, and upper and lower stationary ring 5 is fixed on the upper and lower flange 18 of casing.There is following defective in the compensation mechanism of sealing device; The applying that only depends on floating of rotating ring to keep dynamic and static sealing surface, when axle had radial deflection, the rotating ring end face can not keep and axis normal, so the radial deflection of running shaft is had relatively high expectations.The fixed combination mode of dynamic and static ring can not finely remedy operating wearing and tearing, adds the influence of beat, and dynamic and static sealing surface can not keep good applying, the reliability of influence sealing.Seal ring 6 between dynamic and static ring and the dynamic and static seat does not wait apart from the axis radius, when transmitting axial force, turns round between the Sealing, the shearing square, make the seal face stress deformation bigger, cause seal face not fit well, also the reliability of influence sealing uses the working pressure condition to be restricted.

Shortcomings such as this device also exists does not in addition have radiating structure, not corrosion-resistant.

It is strong that the purpose of this utility model provides a kind of compensation ability, and sealing is reliable, and range of working pressure is big, resistant to elevated temperatures double end-face mechanical sealing device.

The major technique measure that the utility model is taked:

Drive sleeve one end and the hypocrateriform rotating seat that are contained on the running shaft are an integral body, and respectively there is a packing groove the upper and lower both sides of rotating seat, and rotating ring is fixed on the rotating seat in the support mode, and rotating ring rotates with drive sleeve.The rotating ring end face is fitted with two stationary ring end faces respectively, and stationary ring also is fixed on the stationary seat in the support mode.Upper and lower stationary seat is relocatable ring-type seat, and supports levelling by upper and lower two groups of springs respectively.Two groups of springs are installed in respectively on the spring seat on the upper and lower pallet.Spring force acts on the stationary seat, makes stationary ring compensate wearing and tearing in the running automatically by stationary seat unsteady, and adjusts seal face automatically with the radial deflection of axle and make it to keep vertical with running shaft.

Between above-mentioned dynamic and static ring seat and dynamic and static ring, seal ring are housed, all are positioned on the position of axis equal radii, and the diameter of dynamic and static ring filler groove and width preferably meet the following relationship formula: $\frac{d_2^2-d_b^2}{d_2^2-d_1^2}\&le;\frac{{\mathrm{<figure-callout\; id="4"\; label="d"\; filenames="Y9720064600081.png"\; state="\{\{state\}\}">d</figure-callout>}}_4^2-d_b^2}{{\mathrm{<figure-callout\; id="4"\; label="d"\; filenames="Y9720064600081.png"\; state="\{\{state\}\}">d</figure-callout>}}_4^2-d_3^2}....\left(1\right)$ B 〉=b ₁Or $\frac{d_2-d_1}{2}\&GreaterEqual;\frac{d_4-d_2}{2}....\left(2\right)$ In the formula: d ₁-stationary ring end face internal diameter; d ₂-stationary ring end face external diameter;

d ₃-packing groove internal diameter; d ₄-packing groove external diameter;

b ₁-packing groove width; B-seal face width;

d _b-balance diameter.

The support mode of above-mentioned dynamic and static ring seat and dynamic and static ring fixedly is the groove tabling by projection on the ring seat packing groove inwall and dynamic and static ring outer rim, and it is circumferentially fixing that dynamic and static ring is done.Rotating ring can rotate with drive sleeve, and stationary ring can float with stationary seat.

In addition, base of the present utility model is provided with water jacket, to adapt to higher operating temperature.Dynamic and static ring material and packing seal material can adopt: anti-corrosion, exotic materials such as teflon, fluorine rubber, FFKM, silicon carbide, Tungsten carbite, carbon graphite, replating, metal spraying.

Effect of the present utility model:

Adopt the rotating ring support with drive sleeve be on the holistic rotating seat, stationary ring is by the structure of floating the stationary seat support and being compensated by upper and lower spring force levelling respectively, guaranteed that the rotating ring end face is under any circumstance all vertical with spin axis, the stationary ring end face can be effectively automatically the seal face that causes of compensating shaft beat or wearing and tearing do not fit, dynamic and static being sealed under hydrodynamic pressure and the spring force effect remains good applying, thereby improved the reliability of sealing.

In addition, the seal ring that unified position is provided with in the dynamic and static ring seat makes each Sealing when being subjected to responsive to axial force, do not produce turn round, the shearing square, stressed evenly, rationally.The use of water sleeve corrosion resistant material makes seal arrangement high temperature resistant, corrosion-resistant.

Above-mentioned measure has improved combination property of the present utility model.At range of working pressure 0-6.4MPa, temperature is still had reliable sealing performance during up to 250 ℃.And when the same transmission diameter of axle, whole device size all reduces.As comparing with HG2098-81, the sealing of U8 type:

Transmission diameter of axle axial dimension radial dimension (mm) UB type φ 100mm 343 370 the utility model φ 100mm 320 330

Open in detail below in conjunction with embodiment's accompanying drawing to the utility model.

Fig. 2 is a structural representation of the present utility model.

Embodiment: as shown in Figure 2, the end that this seal arrangement is sleeved on the drive sleeve 9 of axle on 7 is a plate-like rotating seat 10, with drive sleeve be a single piece.Respectively there is a packing groove the upper and lower both sides of rotating seat, and rotating ring 4 is fixed on the rotating seat 10 in the support mode.The support means of fixation is the groove tabling by projection on the packing groove inwall and rotating ring outer rim, rotates with drive sleeve thereby drive rotating ring, thereby guarantees that the rotating ring end face is under any circumstance vertical all the time with axis.The rotating ring end face is fitted with upper and lower two stationary rings, 5 end faces respectively, and stationary ring 5 is also to be fixed on the stationary seat 14 with the same support mode of rotating ring.But upper and lower stationary seat is the ring-type seat of axial float, and supports levelling by upper and lower two groups of springs 8 respectively.Spring is contained on the spring seat 15 that places in the upper and lower pallet.Spring force acts on the stationary seat, by the wearing and tearing in the compensation running automatically of floating of stationary seat, and aligns the vertical of seal face and running shaft automatically with the beat of running shaft.

In addition, when making this device be subjected to axial force, each seal ring is subjected to even axial force, does not produce moment of torsion, and seal ring all is located at apart from the position of radiuses such as axis on the upper and lower sound ring seat.The packing groove diameter and the width of upper and lower dynamic and static ring seat meet following relation: $\frac{d_2^2-d_b^2}{d_2^2-d_1^2}\&le;\frac{{\mathrm{<figure-callout\; id="4"\; label="d"\; filenames="Y9720064600081.png"\; state="\{\{state\}\}">d</figure-callout>}}_4^2-d_b^2}{{\mathrm{<figure-callout\; id="4"\; label="d"\; filenames="Y9720064600081.png"\; state="\{\{state\}\}">d</figure-callout>}}_4^2-d_3^2}....\left(1\right)$ B 〉=b ₁Or $\frac{d_2-d_1}{2}\&GreaterEqual;\frac{d_4-d_2}{2}....\left(2\right)$ In the formula: d ₁-stationary ring end face external diameter 140mm;

d ₂-stationary ring end face internal diameter 130mm;

d ₃, d ₄The inside and outside footpath of-packing groove is respectively 134.7mm and 142mm;

d _b-balance diameter 133.5mm;

B-seal face width 5mm;

b ₁-packing groove width 3.85mm.

Rotating ring adopts carbofrax material, and stationary ring adopts carbon graphite material.In addition, be provided with water jacket 16 in this device bottom to adapt to higher operating temperature.

This device sealing principle: enter in the Seal cage from inlet a at flowing medium, dynamic and static ring keeps fitting under the effect of pressure medium and spring force.When axle had radial deflection, the rotating ring end face remained and axis normal, and the stationary ring end face keeps fitting with the rotating ring end face with the levelling compensating action of spring force to stationary seat automatically, thereby has guaranteed the reliability of sealing.Range of working pressure reaches 0-6.4MPa, and operating temperature reaches 250 ℃.

Claims (4)

1, a kind of double end-face mechanical sealing device, include driving sleeve, moving, thereon moving of stationary seat and support, stationary ring, spring and spring seat, it is characterized in that: drive sleeve (9) one ends and the plate-like rotating seat (10) that are sleeved on the axle (7) are an integral body, on the rotating seat, respectively there is a packing groove following both sides, rotating ring (4) is fixed on the rotating seat in the support mode, rotating ring (4) end face is respectively with last, the end face of two stationary rings (5) is fitted down, stationary ring (5) also is fixed on the stationary seat (14) in the support mode, on, following stationary seat is by last, following two groups of springs (8) support, and can float, and spring seat is arranged on, on the following pallet (15).

2, double end-face mechanical sealing device according to claim 1, it is characterized in that: seal ring (6) is housed between upper and lower sound ring seat and the dynamic and static ring, all be located on the position of axis equal radii, and the packing groove diameter of upper and lower dynamic and static ring and width meet the following relationship formula: $\frac{d_2^2-d_b^2}{d_2^2-d_1^2}\&le;\frac{d_4^2-d_b^2}{d_4^2-d_3^2}....\left(1\right)$ And b 〉=b ₁Or $\frac{d_2-d_1}{2}\&GreaterEqual;\frac{d_4-d_2}{2}....\left(2\right)$ In the formula: d ₁---stationary ring end face internal diameter; d ₂---stationary ring end face external diameter;

d ₃---the packing groove internal diameter; d ₄---the packing groove external diameter;

b ₁---the packing groove width; B---seal face width;

d _b---balance diameter.

3, double end-face mechanical sealing device according to claim 1 is characterized in that: rotating ring fixedly is a groove tabling by projection on the packing groove inwall and dynamic and static ring outer rim in the support mode on the ring seat, makes dynamic and static ring circumferentially fixing.

4, double end-face mechanical sealing device according to claim 1 is characterized in that: dynamic and static ring material and packing seal material can adopt teflon, fluorine rubber, silicon carbide, Tungsten carbite, carbon graphite, replating, metal spraying.

Images