CN210087993U

CN210087993U - Oil shield follow-up sealing device of steam turbine

Info

Publication number: CN210087993U
Application number: CN201920276887.5U
Authority: CN
Inventors: 曾庆猛; 吴峥峰; 陈浩; 陈友良
Original assignee: Huadian Electric Power Research Institute Co Ltd
Current assignee: Huadian Electric Power Research Institute Co Ltd
Priority date: 2019-03-05
Filing date: 2019-03-05
Publication date: 2020-02-18
Anticipated expiration: 2029-03-05

Abstract

The utility model provides a steam turbine oil keeps off follow-up sealing device belongs to equipment technical field for the steam turbine. When the steam turbine operates, if the clearance between the oil retaining tooth tip of the bearing box and the rotating shaft is small, the problem of collision and abrasion is easy to occur, and adverse effects are brought to the economic and safe operation of a unit; if the clearance is great, though reducible bumping and grinding, bearing box lubricating oil easily leaks and outside foreign matter or steam etc. easily enter the bearing box, the utility model discloses can solve this problem. The utility model discloses a steam turbine oil keeps off follow-up sealing device, including gasket, elastomeric element and self-lubricating part. The gasket is ring type structure, and the inner of gasket is fixed in the pivot, rotates along with the pivot, and the outer end of gasket passes through elastomeric element and links to each other with self-lubricating part, plays the oil that prevents in the bearing box and leaks and the good effect that outside foreign matter or steam got into the bearing box, self-lubricating part and oil baffle body contact.

Description

Oil shield follow-up sealing device of steam turbine

Technical Field

The utility model belongs to the equipment field for the steam turbine, concretely relates to steam turbine oil keeps off follow-up sealing device.

Background

The turbine oil baffle is a circle which is arranged on a bearing seat and does not move, and is used for preventing lubricating oil from leaking and preventing external foreign matters or steam and the like from entering the bearing to pollute the lubricating oil. The oil keeps off and installs behind the tip of steam turbine bearing box, there is 0.3-0.9 millimeter clearance between the annular tooth point of oil fender tooth and the steam turbine pivot, if the installation clearance undersize, then lead to pivot and oil fender tooth to bump the mill easily, bump the mill and probably cause oil fender scaling high temperature carbonization, the carbide is piled up gradually, it is bigger and bigger with rotor area of contact, extrude its hardness through pivot friction, thereby lead to frictional intensity bigger and bigger, the vibration that probably leads to the pivot is bigger and bigger, and the vibration appears repeatedly, last time of a specified duration, influence unit safe operation. In addition, the clearance between the rotating shaft and the oil blocking teeth can be increased due to the occurrence of collision and abrasion, if the reserved clearance is large in installation, the lubricating oil can be leaked out due to the large clearance, when the bearing box of the steam turbine works, negative pressure exists in the bearing box, and external foreign matters or steam are easily sucked into the bearing box, so that the oil quality is influenced, and the performance of the lubricating oil is reduced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the above-mentioned not enough that exists among the prior art, and provide a steam turbine oil blanket follow-up sealing device that structural design is reasonable, excellent in use effect.

The utility model provides a technical scheme that above-mentioned problem adopted is: a turbine oil baffle follow-up sealing device comprises an oil baffle body and a rotating shaft, wherein the oil baffle body is sleeved outside the rotating shaft, and a gap is formed between the oil baffle body and the rotating shaft; the sealing device is characterized by also comprising a sealing sheet, an elastic component and a self-lubricating component; the gasket is ring type structure, and the inner of gasket is fixed in the pivot, rotates along with the pivot, and the outer end of gasket passes through elastomeric element and links to each other with self-lubricating part, plays the effect that prevents that the oil in the bearing box from leaking and outside foreign matter or steam entering bearing box, self-lubricating part keeps off the body contact with oil.

Furthermore, the inner end of the sealing sheet is completely welded with the rotating shaft to form a closed structure.

Further, one end of the self-lubricating component is in complete contact with the oil baffle body, and a closed structure is formed.

Preferably, the sealing sheet is a whole circle of thin sheet welded on the rotating shaft, and the material can be a stainless steel sheet with relatively low price, or other materials with relatively low hardness and wear resistance, or materials with certain elasticity.

Preferably, the elastic component is made of a material with certain elasticity in order to absorb or compensate the axial movement of the sealing sheet along with the rotating shaft, and reduce the pressure between the self-lubricating component and the oil baffle, thereby reducing the friction between the self-lubricating component and the oil baffle.

Preferably, the elastic member is made of a dense material in order to ensure the sealing performance of the oil seal device and reduce the leakage of the lubricating oil and the entry of foreign matters or steam into the bearing housing.

Preferably, the self-lubricating member is made of a self-lubricating composite material.

Compared with the prior art, the utility model, have following advantage and effect: because gasket, elastomeric element and self-lubricating part have constituteed a confined interval, prevented leaking of lubricating oil and the entering of outside foreign matter or steam etc, so in the installation of oil fender, can suitably increase oil fender prong and pivot clearance, prevent that prong and pivot from bumping the mill, solved the oil and kept off the easy collision mill problem that takes place the sound part of tooth and pivot clearance undersize, also solved the too big problem that leads to lubricating oil to leak and outside foreign matter or steam etc. to get into the bearing box of clearance.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of a turbine oil stop follow-up sealing device in an embodiment of the present invention.

Fig. 2 is a schematic view showing a connection relationship between the sealing plate and the rotating shaft in fig. 1.

In the figure: the sealing piece 1, the elastic component 2, the self-lubricating component 3, the oil baffle 4 and the rotating shaft 5.

Detailed Description

The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.

Examples are given.

Referring to fig. 1 to 2, the steam turbine oil baffle follow-up sealing device in the embodiment includes an oil baffle body 4 and a rotating shaft 5, wherein the oil baffle body 4 is sleeved outside the rotating shaft 5, and a gap is formed between the oil baffle body 4 and the rotating shaft 5; the sealing plate comprises a sealing plate 1, an elastic component 2 and a self-lubricating component 3; the gasket 1 is the ring type structure, and the inner of gasket 1 is fixed in pivot 5, rotates along with pivot 5, and elastomeric element 2 and self-lubricating part 3 link to each other are passed through to the outer end of gasket 1, play the effect that prevents that the oil in the bearing box from leaking and outside foreign matter or steam get into the bearing box, self-lubricating part 3 keeps off 4 contacts with oil.

The inner end of the sealing piece 1 is completely welded with the rotating shaft 5 to form a closed structure.

One end of the self-lubricating component 3 is completely contacted with the oil baffle body 4 to form a closed structure.

When the rotating shaft 5 vibrates radially, the sealing sheet 1 on the rotating shaft drives the elastic component 2 and the self-lubricating component 3 to move radially, and the self-lubricating component 3 is in constant axial contact with the oil baffle 4. When the rotating shaft 5 moves leftwards along the axial direction, namely moves towards the direction close to the oil baffle body 4, the sealing sheet 1 on the rotating shaft moves leftwards for the same distance, the elastic component 2 is compressed, the leftward axial displacement of the sealing sheet 1 is absorbed, the contact pressure of the self-lubricating component 3 and the oil baffle body 4 cannot be greatly increased, and the friction between the self-lubricating component 3 and the oil baffle body 4 cannot be greatly increased. When the rotating shaft 5 moves rightwards along the axial direction, namely moves towards the direction far away from the oil baffle body 4, the sealing sheet 1 on the rotating shaft also moves rightwards for the same distance, the elastic component 2 extends to compensate the rightwards axial displacement of the sealing sheet 1, so that the self-lubricating component 3 and the oil baffle body 4 are still in a contact state, and a better sealing effect is achieved.

The sealing sheet 1 can be made of a stainless steel sheet with relatively low price, or other materials with relatively low hardness and wear resistance, or materials with certain elasticity; the elastic component 2 is made of a compact material with certain elasticity, and the elastic component has certain elasticity for absorbing or compensating the axial movement of the sealing sheet 1 along with the rotating shaft 5 and reducing the pressure between the self-lubricating component 3 and the oil baffle 4 so as to reduce the friction therebetween; the dense material is selected to ensure the sealing performance of the oil baffle sealing device and reduce the leakage of lubricating oil and the entry of external foreign matters or steam and the like into the bearing box.

And will be apparent to those skilled in the art from the foregoing description.

In addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an example of the structure of the present invention. All the equivalent changes or simple changes made according to the structure, characteristics and principle of the utility model are included in the protection scope of the utility model. Various modifications, additions and substitutions may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.

Claims

1. A turbine oil baffle follow-up sealing device comprises an oil baffle body (4) and a rotating shaft (5), wherein the oil baffle body (4) is sleeved outside the rotating shaft (5), and a gap is formed between the oil baffle body (4) and the rotating shaft (5); the sealing device is characterized by also comprising a sealing sheet (1), an elastic component (2) and a self-lubricating component (3); the sealing strip (1) is of a circular ring type structure, the inner end of the sealing strip (1) is fixed on the rotating shaft (5), the outer end of the sealing strip (1) is connected with the self-lubricating part (3) through the elastic part (2), and the self-lubricating part (3) is in contact with the oil baffle body (4).

2. The turbine oil deflector follower seal arrangement according to claim 1, characterized in that the seal plate (1) is welded completely between its inner end and the shaft (5) to form a closed structure.

3. The turbine oil dam follower seal arrangement according to claim 1, characterized in that one end of the self-lubricating member (3) is in full contact with the oil dam (4) to form a closed structure.