CN2612841Y

CN2612841Y - Radial labyrinth type rotating shaft sealing arrangement

Info

Publication number: CN2612841Y
Application number: CN 03250922
Authority: CN
Inventors: 王立业; 张军
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-05-03
Filing date: 2003-05-03
Publication date: 2004-04-21
Anticipated expiration: 2013-05-03

Abstract

The utility model relates to a non-contact rotation shaft seal structure, which comprises a movable ring and a static ring, a section of the movable ring is nearly of an I-shaped, the two tooth ends are of an wing shape, three chambers are divided between the movable ring and the static ring, the movable ring comprises two semicircles, and a fixed ring which is buttedly welded is arranged on a periphery. Because using unique geometry design, the utility model obtains excellent sealing effect and allows a shaft with a certain radial runout. The utility model has the advantages of simple structure, convenient processing and installment, and is capable of reforming common seal devices.

Description

Radial labyrinth formula sealing device for rotary shaft

Technical field: the utility model relates to contactless rotation axis seal structure, especially radial labyrinth formula rotation axis seal structure.

Background technique: in the prior art, mostly radial labyrinth formula rotation shaft seal is to be made up of rotating ring and stationary ring, the throttling action in gap realization sealing between gap and stationary ring increment and rotating ring groove bottom between dependence rotating ring increment and stationary ring groove bottom.Its deficiency is, one will make the leakage rate by Sealing remain in the tolerance limit, then must continue to guarantee to have very little seal clearance between increment and groove bottom, and this just proposes very high requirement to design, structure and the manufacturing assembly precision of machine; They are two years old, the difficult control in the little gap of increment and groove bottom, growth with service time, the bearing play will increase, perhaps operating temperature is different with fitting temperature, and workpiece expands with heat and contract with cold etc., and the seal clearance between dynamic and static ring is changed, perhaps lose the gap and cause contact and sintering, perhaps excesssive gap and seal failure.Though produced at the problems referred to above in the prior art and on dynamic and static ring, added annular tooth, added technology such as packing layer in the circular groove bottom surface, substantially can overcome the deficiency that only depends on dynamic and static ring sealing, but manufacture difficulty and operating cost are increased, especially in the sealing of organic oil oil supply system, more show its complex structure, the deficiency that produce, mounting cost is high.

Summary of the invention: the purpose of this utility model is that a kind of simple in structure, good sealing effect of design allows axle that the radial labyrinth formula sealing device for rotary shaft of certain circular runout is arranged again.

For achieving the above object, the technological means that the utility model is taked is, according to principle of dynamics, radial cross section geometrical shape to rotating ring is carried out scientific design, by the rectangle in past or trapezoidal change into closely I-shaped, and two increments are wing, two tooth wing oblique angles are 45 °, thereby make and be separated into 3 chambers between rotating ring and the stationary ring, after lubricant oil flows into 3 chambers, under high-speed rotating shaft drives, form eddy current, the machine oil flow velocity is reduced, owing to gap between rotating ring and stationary ring is very little, make machine oil frictional heat herein on the one hand, cause the machine oil volumetric expansion, pressure strengthens, thereby reaches the throttling seal action, and machine oil is by concentrating in the interplane lumen of two teeth under the further centrifugal action that strengthens in 45 ° of oblique angles of the rotating ring two tooth wings on the other hand, and this chamber communicates with return line, can make the machine oil that enters this chamber and have certain pressure flow back to oil supply system smoothly, under the circulation decompression, make the throttling seal action of seal ring more outstanding.Because the throttling action that the design's particular structure is produced, make requirement reduction in gap between rotating ring and stationary ring, especially the gap can be strengthened between rotating ring increment and stationary ring bottom land, thereby can satisfy axle the usage requirement of necessarily beating is arranged, and seal life is prolonged greatly.

The quantity of dynamic and static ring can require to be provided with 2-3 according to leakage rate.For making rotating ring easy for installation, and can transform in conjunction with the conventional seals ring, the utility model is designed to seal ring to be combined by two semicircles, behind sealed case (being stationary ring) location, determine that seal ring (rotating ring) is at axial position, in seal ring, be coated with sealer and fix, then with retaining ring with two semi-circular seal ring bandings, joint adopts butt welding.

Description of drawings:

Fig. 1 is the seal ring orthogonal view;

Fig. 2 is a seal ring section partial enlarged drawing;

Fig. 3 is the seal ring erection drawing;

Fig. 4 is the big oil sealing sealing lid of a diesel engine of diesel locomotive sectional drawing.

1-running shaft 2-sealed case (stationary ring) 3-seal ring (rotating ring)

4-retaining ring 5-top cover labyrinth 6-lower sealing cover 7-return line

8-sealing gasket 9,10-oil duct

Embodiment:

As shown in Figure 1, seal ring (rotating ring) 3 is processed into two semicircles of nearly I shape;

As shown in Figure 2, nearly I-shaped seal ring 3 increment both wings are 45 ° of oblique angles;

As shown in Figure 3, behind sealed case (stationary ring) 2 location, determine the axial position of seal ring 3, seal ring 3 coated on bottom side sealers are bonding with axle 1, and with retaining ring 4 with two semicircle seal ring 3 bandings, joint employing butt welding;

As shown in Figure 4, present embodiment is the seal arrangement of the big oil sealing of diesel engine of diesel locomotive, the big oil sealing of diesel engine is made up of top cover labyrinth 5 and lower sealing cover 6, upper and lower sealing cover assembling is fastened on the output end face of body, upper and lower sealing cover closely is connected with fastening screw through locating stud, and its junction plane adopts the sealing gasket sealing of being made by telephone paper.According to bulk between oil duct 9,10 in the big oil sealing of diesel engine and the axle, the seal ring that processing adapts, behind top cover labyrinth 5 and lower sealing cover 6 location, determine the axial position of seal ring, being coated with sealer in the seal ring is fixed on the axle, with two semicircular seal ring bandings, the retaining ring joint adopts butt welding with retaining ring.Machine oil flows back to oil supply system in dynamic and static ring lumen through return line 7 in seal ring throttling union.

Claims

1, a kind of radial labyrinth formula sealing device for rotary shaft is made up of rotating ring and stationary ring, and for closely I-shaped, two increments are wing to its feature in the rotating ring radial cross section, will be separated into 3 chambers between rotating ring and stationary ring.

2,, it is characterized in that described rotating ring two increment wing oblique angles are 45 degree according to the described radial labyrinth formula of claim 1 sealing device for rotary shaft.

3,, it is characterized in that described rotating ring is made up of two semicircle rotating rings according to the described radial labyrinth formula of claim 1 sealing device for rotary shaft.

4, according to the described radial labyrinth formula of claim 3 sealing device for rotary shaft, it is characterized in that, add the retaining ring of butt welding two semicircle rotating ring peripheries.