CN2082339U

CN2082339U - Labyrinth sealing with sealing function at stop

Info

Publication number: CN2082339U
Application number: CN 91202940
Authority: CN
Inventors: 朱毅征
Original assignee: BEIJING COLLEGE OF CHEMICAL TECHNOLOGY
Current assignee: BEIJING COLLEGE OF CHEMICAL TECHNOLOGY; Beijing University of Chemical Technology
Priority date: 1991-02-28
Filing date: 1991-02-28
Publication date: 1991-08-07

Abstract

The utility model provides a labyrinth spiral sealing device for a pump, which has the structural principle that a pump shaft is sheathed with a rotary sleeve provided with multithread outer screws and synchronously rotating with the pump shaft. A pump case outside the rotary sleeve is sheathed inside with a stator with multithread inner screws. A leakage stopping ring for charging sealing liquid is clamped outside the rotary sleeve and the right section of the stator. The rotary sleeve and the left section of the stator are additionally provided with a parking sealing device playing the sealing action under the condition of parking. In the process of rotation, large axial sealing pressure formed in a ring cavity between the rotary sleeve and the stator is used for sealing.

Description

Labyrinth sealing with sealing function at stop

The utility model relates to a kind of seal arrangement, and is particularly a kind of for the matching used labyrinth spiral sealing device that has parking sealer of pump class.

At present, mechanical seal and various packing seal have obtained using very widely, but because it all belongs to the contact sealing, thereby exist that surface friction drag is big, deficiency such as serious wear, working life are short, especially can't adapt to fully and be competent at, the especially frequent replacing of Sealing need for some corrosivity, the working condition that contains harshness such as particle, high temperature, high speed.

In recent years, someone has newly developed a kind of spiral sealing device and it has been applied in the sealing of pump class, its basic structure is that the spindle nose section at pump shaft installs an axle sleeve that has external spiral additional, utilize spiral sleeve and be placed in its outer smooth axial screw sealing load that under rotating, is produced between the part in addition, reach the purpose that stops medium to leak outside, because this sealing belongs to untouchable sealing, thereby has less surface friction drag and certain working life.But its maximum shortcoming is that its formed sealing load is less, only be applicable to the sealing of the big medium of viscosity and the sealing under the slow-speed of revolution situation, because if rise because of the friction aggravation then can cause temperature between rotating speed height, the rotating component, and dielectric viscosity is descended, be that medium is thinning and cause seal failure, so Applicable scope is narrower.Particularly do not have parking sealer to tell function in the seal arrangement now, make machine cause leakage yet in static bottom.

The purpose of this utility model Ying Yu overcomes the above-mentioned shortcoming and defect of existing in prior technology, and provides a kind of sealing load big, and adaptability is strong, the labyrinth spiral sealing device that has parking sealer of good sealing effect.

The purpose of this utility model is achieved in that overlaps a pivoted housing that has the bull external spiral that rotates synchronously with pump shaft admittedly on pump shaft, stator that has the bull internal spiral of encapsulation in the pump case of pivoted housing outside, in the right section of pivoted housing and stator external card one resistance that can annotate sealing liquid is housed and leaks ring, install a parking sealing arrangement that can under the parking situation, play seal action additional in pivoted housing and stator left side section, in rotation process, seal by the bigger axial seal pressure that forms in the ring cavity between pivoted housing and the stator.

The forward and reverse spiral of bull of the utility model car system on pivoted housing and stator has produced in rotation process has bigger envelope pressure, and be sealing strip with certain seal length, thereby stoped the leakage of medium effectively, because the use of ring and sealing liquid is leaked in resistance, played and prevented the gentle positive role that gulps down phenomenon of seal failure preferably, particularly the adding of parking sealer makes that sealing is more reliable, safer, and Applicable scope is more extensive.

Concrete structure of the present utility model is provided by following embodiment and accompanying drawing thereof.

Fig. 1 is a sectional drawing of the present utility model.

Fig. 2 is the A-A sectional drawing of Fig. 1.

Fig. 3 is the partial enlarged drawing of spiral among Fig. 1.

Fig. 4 is a B-B sectional drawing among Fig. 1.

Below in conjunction with accompanying drawing 1-4 structure of the present utility model and working principle are described in detail.

On pump shaft 1, be installed with one and have external spiral section 2a, the spiral pivoted housing 2 of 2b and 2c, in pump case 6 endoporus of spiral pivoted housing 2 outsides, be installed with a stator 4 that has an internal spiral section 4a, one annular space 7 is arranged between the pivoted housing 2 of stator 4 and Qi Nei, at the stator 4 in 7 left sides, annular space and ring cavity 9 places between the pivoted housing 2 parking sealer ring 10 is housed, be with a resistance that has internal spiral section 3a and sealing liquid hand-hole 3b in stator 4 external card and leak ring 3, between the internal spiral section 3a that ring is leaked in resistance and the pivoted housing external spiral section 2b annular space 8 is arranged, resistance is leaked ring 3 and is connected by pressing plate 5 clinchings with pump case 6 on the left of it.See Fig. 1 and Fig. 2.

Each spiral section that pivoted housing 2, stator 4, parking sealer ring 10 and resistance are leaked on the ring 3 is multi-head spiral, and annular space between the

spiral section

7,8 and 11 radial clearance are in 0.25 to 0.4 millimeter scope in twos, and rotary orientation is opposite between the per two relative spiral sections.See Fig. 1 and Fig. 3.

It is the shape of the round platform of a hollow that ring 3 is leaked in resistance, its left end have one radially projection with pressing plate 5 in rims of the mouth join the bulge loop 3c of pressure, resistance leak ring 3 endoporus have with its in stator 4 boss 4b join the interior rim of the mouth 3d of pressure, resistance is leaked 3d right sides, rim of the mouth in the ring 3 and radially is drilled with a sealing liquid hand-hole 3b who connects with annular space 7 and 8.See Fig. 1 and Fig. 2.

Parking sealer ring 10 movable sets are in the external spiral section 2c outside of pivoted housing 2 left side sections, put spring 12 in the circumferentially uniform hole 10a of parking sealer ring 10, the left end of each spring 12 leans on ring cavity 9 inner left wall, between seal ring 10 external diameters and the stator 4 seal ring 13 is housed, seal ring 10 endoporus have and the opposite multiple thread spiral section 10b of its corresponding external spiral section 2c rotation direction, see Fig. 1 and Fig. 4.

External spiral section 2c rotation direction is opposite with the rotation direction of external spiral section 2a.

Working mechanism of the present utility model is: pivoted housing 2 with pump shaft 1 rotation the time by the effect of the axial force that is produced between spiral thereon and the spiral opposite with its rotation direction, the medium that leaks has to the right been run into have the leak resistance of effect left of certain segment length and big sealing load, thereby can play good sealing effect and wider medium adaptability.Because medium leaks more to the right, it is more and more littler that its pressure then becomes, and the leakage possibility that is produced is just more little, so the leakage contribution rare thick and that variation of temperature caused of medium is not very big.On the right side of annular space sometimes because the external pressure effect of rotating speed or air, produce small leakage sometimes or gas gulps down phenomenon, in order to make sealing more reliable safer, installed the sealing liquid of to annotate on the right side of annular space additional, prevented that gas from gulping down and playing the resistance leakage ring 3 of secondary resistance leakage effect.

Under vehicle stop state, the axial force that produces when being rotated by spiral section 2c disappears, and promptly parking sealer ring 10 is close to the right under the effect of its left end spring 12, and by the right side and the sealing of pivoted housing 2 left sides of seal ring 10, medium does not leak outside when making parking.After pivoted housing 2 reached certain rotating speed after driving, spiral section 2c produced a power opposite with acting force of the spring to seal ring, makes face opening, and at this moment medium seals by the spiral section 2a and the 4a at 7 places, annular space.

Sometimes, the outer spy of pump shaft 1 section is because of installing and the structure needs can not be oversize, at this moment; Because the pump shaft shorten length has caused the axial length of pivoted housing and stator to reduce and the shortening of effective helix angle seal section length, make the very little rare medium of viscosity be easy to leak, certain extra high rotating speed also can produce the thinning phenomenon of medium, for solving this special circumstances, can be with being designed to an annular cooling cavity 14 between pump case and the stator outer surface, to reach the purpose that the water flowing cooling improves dielectric viscosity, improves sealing effect.Referring to Fig. 1.

Therefore the utility model is that a kind of sealing load is big, good sealing effect and have the supporting seal arrangement of pump of parking sealer.

Claims

1, a kind of labyrinth spiral sealing device with parking sealer, it is characterized in that: on pump shaft 1, be installed with one and have external spiral section 2a, the spiral pivoted housing 2 of 2b and 2c, in pump case 6 endoporus of spiral pivoted housing 2 outsides, be installed with a stator 4 that has an internal spiral section 4a, one annular space 7 is arranged between the pivoted housing 2 of stator 4 and Qi Nei, at the stator 4 in 7 left sides, annular space and ring cavity 9 places between the pivoted housing 2 parking sealer ring 10 is housed, be with a resistance that has internal spiral section 3a and sealing liquid hand-hole 3b in stator 4 external card and leak ring 3, between the internal spiral section 3a that ring is leaked in resistance and the pivoted housing external spiral section 2b annular space 8 is arranged, resistance is leaked ring 3 and is connected by pressing plate 5 clinchings with pump case 6 on the left of it.

2, according to the labyrinth spiral sealing device of the described band parking sealer of claim 1, it is characterized in that: each spiral section that pivoted housing 2, stator 4, parking sealer ring 10 and resistance are leaked on the ring 3 is multi-head spiral, annular space between the spiral section 7,8 and 11 radial clearance are in 0.25 to 0.4 millimeter scope in twos, and rotary orientation is opposite between the per two relative spiral sections.

3, according to the labyrinth spiral sealing device of claim 1 or 2 described band parking sealers, it is characterized in that:

It is the shape of the round platform of a hollow that ring 3 is leaked in a, resistance, its left end have one radially projection with pressing plate 5 in rims of the mouth join the bulge loop 3c of pressure, resistance leak ring 3 endoporus have with its in stator 4 boss 4b join the interior rim of the mouth 3d of pressure, resistance is leaked 3d right sides, rim of the mouth in the ring 3 and radially is drilled with a sealing liquid hand-hole 3b who connects with annular space 7 and 8;

B, external spiral section 2c rotation direction are opposite with the rotation direction of external spiral section 2a;

C, parking sealer ring 10 movable sets are in the external spiral section 2c outside of pivoted housing 2 left side sections, put spring 12 in the circumferentially uniform hole 10a of parking sealer ring 10, the left end of each spring 12 leans on ring cavity 9 inner left wall, between seal ring 10 external diameters and the stator 4 seal ring 13 is housed, seal ring 10 endoporus have and the opposite multiple thread spiral section 10b of its corresponding external spiral section 2c rotation direction.