CN2438878Y

CN2438878Y - Dynamic sealing apparatus of shaft for high-temperature high-pressure gas container

Info

Publication number: CN2438878Y
Application number: CN 00250018
Authority: CN
Inventors: 白玉珂
Original assignee: Institute of Semiconductors of CAS
Current assignee: Institute of Semiconductors of CAS
Priority date: 2000-09-04
Filing date: 2000-09-04
Publication date: 2001-07-11
Anticipated expiration: 2010-09-04

Abstract

The utility model relates to a dynamic sealing apparatus for a shaft of a high-temperature and high-pressure gas container, which comprises a sealing body, a vessel and a shaft, wherein, a barrel-shaped groove is grooved on the inner diameter of the sealing body, and an O-shaped ring and a pad sheet are laid in the barrel-shaped groove between the shaft and a vessel wall. The device of the utility model is applied to the rotation and the elevating sealing of a crucible rod and a crystal rod of an LEC single crystal furnace, and the utility model has the advantages of avoidance of the leakage of high-temperature and high-pressure gas, benefit for crystal growth, and protection of personal safety.

Description

The dynamic sealing means of the axle of high temperature and high pressure gas container

The utility model relates to seal arrangement, particularly a kind of dynamic sealing means of axle of the container that is used to be equipped with high temperature, pressurized gas.

In real work, a shaft extension is advanced to be equipped with in high temperature (1400 ℃), high pressure (7MPa) gas containers if desired and go, this root axle can freely rotate, and the energy axial motion, and simultaneously, the high temperature in the container, pressurized gas can not leak.Reach this requirement, just need seal arrangement between axle and the container wall.If axle has only rotation, sealing easily if axle not only rotates, and is done axial motion, seals just very difficultly, and high temperature, pressurized gas are arranged again, seals just more difficult.Seed rod, the crucible pole rotational sealing structure of present domestic LEC (high pressure LEC) single crystal growing furnace and the Britain LEC of MR company single crystal growing furnace are reasonable inadequately, all have the high problem of leak rate.The sealing configuration of Britain MR company is such: use seal with elastometic washer between axle and the container wall, the section of rubber seal is the square type, therefore, is that face contacts between seal ring and axle and the container wall, and very difficult like this assurance is air tight.Air tight as if guaranteeing, will impose severe pressure to seal ring, pressure is big, and axle rotates just dumb, and pressure is little, will leak gas; Though seal ring has packing ring up and down, the shaped design of packing ring is unreasonable, can not play lubrication to seal ring.So this seal arrangement sealing effect is bad.Adding does not have water-cooled, and seal ring and packing ring are with once changing, and be pretty troublesome.

The purpose of this utility model is to provide a kind of dynamic sealing means of axle of the high temperature and high pressure gas container that overcomes above-mentioned shortcoming.

Main feature of the present utility model is that the dynamic sealing means of the axle of high temperature and high pressure gas container comprises seal, container, axle, opens a tubbiness groove at the seal internal diameter, places O shape circle and pad in the tubbiness groove between axle and container wall.

The utility model device is applied to the rotation and the lifting sealing of LEC single crystal growing furnace seed rod, crucible pole, avoids high temperature, high pressure gas leakage, is beneficial to growth of crystal, the protection personal safety.

Fig. 1 is the dynamic seal (packing) structural drawing of the axle of high temperature and high pressure gas container.

Fig. 2 is the packing ring schematic representation.

Fig. 3 is the O-ring seals structural drawing.

Below in conjunction with accompanying drawing in detail the utility model is described in detail.

Seal ring between axle and the container wall adopts " O " type structure, about " O " RunddichtringO, puts teflon gasket.As shown in Figure 3, the mould of " O " RunddichtringO seam vestige should become miter angle with " O " RunddichtringO plane, does not contact with container wall with axle to guarantee this mould seam vestige, thereby guarantees that seal ring contacts well with container wall with axle; The section of " O " seal ring is circular, because the design of accurate tolerance fit, is similar to line between " O " RunddichtringO and axle and the container wall and contact, so, do not need " O " RunddichtringO is exerted pressure, with regard to the energy good seal; Under the high pressure effect, because the rotation and the axial motion of axle, " O " RunddichtringO can be pressed against in the slit between axle and the container wall and go, and causes axle motion dumb, or is stuck, and for this reason, about " O " RunddichtringO, puts teflon gasket.(pad as shown in Figure 2.) because the accurate tolerance fit design of teflon gasket, pad prevents effectively that to " O " RunddichtringO energy lubricate the axis phenomenon from taking place, and makes the axle motion nimbly and freely.Spacer thickness is 2～3MM, the too thick lubrication that do not have.In addition, pad is cut R-joining one, seam becomes 15-30 degree angle, purpose with the pad plane be to be convenient to installation and to increase the lubrication of pad to " O " RunddichtringO.

As shown in Figure 1,, " O " type circle and packing ring are put into seal, form an assembly, be connected with container again for the ease of processing, installation and maintenance.

On seal internal diameter Φ B, open a tubbiness groove (see figure 1), place " O " type circle and packing ring.One end of groove and seal outside apart from M greater than 2 centimetres, the other end of groove apart from container outer wall apart from J greater than 10 centimetres, the length of groove adds thickness and the long 1MM of three packing rings than two " O " type ring cross-section diameters, the cylinder of the external diameter Φ A of groove, and degree of finish is 0.4.The coaxality of the internal diameter Φ B of the external diameter Φ A of groove and groove is Φ 0.1.The degree of finish of axle is 0.4.The cylindricity of axle is 0.005.In order to produce a desired effect, the tolerance fit between each parts is extremely important.The external diameter Φ A of groove and " O " type circle external diameter Φ D should have the interference fit of 0.3-0.4MM.The external diameter Φ A of groove and washer outer diameter Φ F should have the Spielpassung of 0.1-0.2MM.The external diameter Φ C of axle and " O " type circle internal diameter Φ E should have the interference fit of 0.3-0.4MM.The Spielpassung that the external diameter Φ C of axle and packing ring internal diameter Φ G should have 0.1-0.2MM.The Spielpassung that the external diameter Φ C of axle and groove internal diameter Φ B should have 0.1-0.2MM.The cross section diameter of " O " type circle is 3-5MM.During installation, " O " type circle and packing ring are smeared a little lubricant oil, in the groove of the seal of respectively packing into, seal is protruding from internal tank, and seal and seal of vessel adopt general static seal to get final product, and use nut screwing clamping, axle is inserted get final product.

Because in the container is high temperature, must cool off sealed member, the water-cooled effect is fine, and this " O " RunddichtringO life-span is very long, works 48 hours at every turn, and is available more than 40 times.In order further to reduce leak rate, this seal arrangement adopts secondary seal.

Claims

1. the dynamic sealing means of the axle of a high temperature and high pressure gas container comprises seal, container, axle, it is characterized in that opening a tubbiness groove at the seal internal diameter, places O shape circle and pad in the tubbiness groove between axle and container wall.

2. by the described device of claim 1, it is characterized in that the mould seam vestige of described O-ring seals becomes 35-55 degree angle with the plane of O-ring seals.

3. by claim 1 and 2 described devices, it is characterized in that described O-ring seals is at least two.

4. by the described device of claim 1, it is characterized in that the overlapping placement of described O-ring seals and pad.

5. by the described device of claim 1, the cross section diameter that it is characterized in that described O-ring seals is the 3-5 millimeter.

6. by the described device of claim 1, it is characterized in that described spacer thickness is the 2-3 millimeter, and on pad, cut a R-joining.

7. by the described device of claim 6, it is characterized in that described R-joining becomes 15-30 degree angle with the pad plane.

8. by the described device of claim 1, it is characterized in that the external diameter of groove and the interference fit of described O-ring seals external diameter are the 0.3-0.4 millimeter.

9. by the described device of claim 1, it is characterized in that the gap of the external diameter of the external diameter of groove and described packing ring is the 0.1-0.2 millimeter.

10. by the described device of claim 1, it is characterized in that the external diameter of axle and the interference fit of described O-ring seals external diameter are the 0.3-0.4 millimeter.

11. by the described device of claim 1, it is characterized in that the gap of the internal diameter of the external diameter of axle and described packing ring is the 0.1-0.2 millimeter.

12. by the described device of claim 1, it is characterized in that the gap of the internal diameter of the external diameter of axle and described groove is the 0.1-0.2 millimeter.