CN214145590U

CN214145590U - Push-pull rod sealing structure of steam turbine

Info

Publication number: CN214145590U
Application number: CN202022801326.8U
Authority: CN
Inventors: 肖汉晨; 谢豪哲; 张毅斐; 段涛; 王宇声; 李建军; 朱超; 刘小斌
Original assignee: DATANG BAOJI THERMOELECTRIC POWER PLANT; Datang Shaanxi Power Generation Co Ltd
Current assignee: DATANG BAOJI THERMOELECTRIC POWER PLANT; Datang Shaanxi Power Generation Co Ltd
Priority date: 2020-11-27
Filing date: 2020-11-27
Publication date: 2021-09-07
Anticipated expiration: 2030-11-27

Abstract

The utility model provides a steam turbine push-and-pull rod seal structure, including setting up push-and-pull rod on the bearing box, setting up sealing mechanism one between cooling sleeve, cooling sleeve and the push-and-pull rod on the push-and-pull rod, sealing mechanism two between push-and-pull rod and the bearing box, bearing box inner seal mechanism three, be equipped with back oil pipe on the cooling sleeve, back oil pipe opening is connected with the bearing box downwards, sealing mechanism one includes sealing ring, interior oil fender one, and the zero clearance setting is between push-and-pull rod and cooling sleeve, sealing mechanism two includes sealing ring, packing gland, sealing ring, packing gland from interior to exterior set gradually between bearing box and push-and-pull rod, sealing mechanism three includes sealing ring, interior oil fender two that from interior to exterior set up at the push-and-pull rod both ends. The utility model discloses the steam turbine oil leakage that has significantly reduced, the staff's that has significantly reduced the work degree of difficulty, eliminated major potential safety hazards such as equipment conflagration, provide effective guarantee for unit safe operation.

Description

Push-pull rod sealing structure of steam turbine

Technical Field

The utility model belongs to the technical field of thermal power plant's steam turbine seal structure, concretely relates to steam turbine push-and-pull rod seal structure.

Background

In the prior art, the oil leakage phenomenon occurs in the operation process of the push-pull rod sealing structure of the steam turbine, so that the obvious oil stain phenomenon occurs in the heat preservation of a valve interlayer valve and a pipeline, the unsafe phenomena of heat preservation, smoke emission and the like of a middle box of the steam turbine for many times are caused, the safe operation of a unit is greatly influenced, and the maintenance cost is increased.

Disclosure of Invention

The utility model provides a steam turbine push-and-pull rod seal structure reduces the oil leakage volume, guarantees unit safe operation.

The technical scheme of the utility model is that: the utility model provides a steam turbine push-and-pull rod seal structure, includes the push-and-pull rod that sets up on the bearing box, sets up cooling sleeve on the push-and-pull rod, the sealing mechanism two between cooling sleeve and the bearing box, the bearing box internal seal mechanism three, be equipped with oil return pipe on the cooling sleeve, oil return pipe opening is connected with the bearing box downwards, sealing mechanism one includes that sealing ring, interior oil keep off one, and the zero clearance setting is between push-and-pull rod and cooling sleeve, sealing mechanism two includes sealing ring, packing gland, sealing ring, packing gland set gradually between bearing box and push-and-pull rod from inside to outside, sealing mechanism three includes that sealing ring, interior oil keep off two set up at the push-and-pull rod both ends from inside to outside.

According to the scheme, the upper portion of the bearing box is further provided with the arc-shaped oil baffle which is arranged at the joint of the push-pull rod and the bearing box, so that the sealing performance is further enhanced, oil is prevented from being sprayed to the position of the push-pull rod, and the oil leakage probability is reduced.

The third sealing mechanism further comprises a baffle reinforcing ring, wherein the baffle reinforcing ring is made of stainless steel and is sleeved and fixed outside the second inner oil retainer.

In a further aspect of the scheme, the packing is a graphite nickel wire packing.

The scheme is further, packing gland comprises the ring of one end open-ended, connects the bolt of ring opening, conveniently adjusts the elasticity.

And in a further scheme, a plurality of screw rods are symmetrically arranged outside the push-pull rod on the inner side of the bearing box, mounting holes are formed in the second inner oil retainer, and the second inner oil retainer and the push-pull rod are fixed by the screw rods through the mounting holes.

The utility model has the advantages that: the back oil leakage amount is reduced by applying the utility model, the daily maintenance amount of the steam turbine body is greatly reduced, a large amount of steam turbine oil is saved, and the purposes of energy saving and efficiency improvement are achieved; along with the elimination of the leakage point, the safe operation of the unit is effectively guaranteed, the flange pressing bolt can be tightened or loosened according to the oil leakage amount observed every day, the working difficulty of workers is greatly reduced, and the oil leakage point can be prevented and controlled; the device eliminates major potential safety hazards such as equipment fire hazards, ensures the safety of personnel, improves the health level of the equipment, ensures the long-period safe operation of the equipment, has huge indirect social benefit, and plays a good reference role for the oil leakage phenomenon of the middle tank of the same type of unit.

Drawings

Fig. 1 is a schematic structural view of a push-pull rod sealing structure of a steam turbine according to the present invention;

fig. 2 is a schematic diagram of a packing gland structure of the push-pull rod sealing structure of the steam turbine of the present invention;

wherein: 1. the bearing box comprises a bearing box body, 2, a push-pull rod, 3, a cooling sleeve, 4, an inner oil retainer I, 5, a sealing ring, 6, a packing, 7, a packing gland, 71, a ring, 72, a bolt, 8, an oil return pipe, 9, an arc-shaped oil retainer, 10, an inner oil retainer II, 11 and a baffle reinforcing ring.

Detailed Description

The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which a person skilled in the art can, without any creative effort, fully implement the present invention.

The utility model discloses a concrete implementation mode is: as shown in fig. 1-2, a steam turbine push-pull rod sealing structure comprises a push-pull rod 2 arranged on a bearing box 1, a cooling sleeve 3 arranged on the push-pull rod 2, a first sealing mechanism between the cooling sleeve 3 and the push-pull rod 2, a second sealing mechanism between the push-pull rod 2 and the bearing box 1, and a third sealing mechanism inside the bearing box 1, wherein an oil return pipe 8 is arranged on the cooling sleeve 3, an opening of the oil return pipe 8 is downward connected with the bearing box 1, so that the oil return cannot be ejected upwards when the unit operates, the oil return flows into the bearing box 1 through the oil return pipe 8, the oil leakage of the push-pull rod 2 is reduced, the first sealing mechanism comprises a first sealing ring 5 and a first internal oil baffle 4, the first sealing mechanism is arranged between the push-pull rod 1 and the cooling sleeve 3 without a gap, the second sealing mechanism comprises a sealing ring 5, a packing 6 and a packing gland 7, the sealing ring 5, the packing 6 and the packing gland 7 are sequentially arranged between the bearing box 1 and the push-pull rod 2 from inside to outside, the third sealing mechanism comprises a sealing ring 5 and an inner oil retainer two 10 which are arranged at two ends of the push-pull rod 2 from inside to outside.

The utility model discloses further, the upper portion of bearing box 1 still is equipped with convex oil fender 9, sets up in push-and-pull rod 2 and 1 junctions of bearing box, further strengthens the leakproofness, shelters from oil spout to push-and-pull rod 2 departments to reduce the oil impregnate probability.

The utility model discloses further, sealing mechanism three still includes baffle reinforcing ring 11, baffle reinforcing ring 11 is made by the stainless steel, and the cover is established and is fixed in the inside oil fender two 10 outsides.

The utility model discloses further, packing 6 is graphite nickel wire packing.

The utility model discloses further, packing gland 7 comprises one end open-ended ring 71, connection ring 71 open-ended bolt 72, conveniently adjusts the elasticity.

The utility model discloses furtherly, the 2 outside symmetries of push-and-pull rod of 1 inboard of bearing box are equipped with a plurality of screw rods, be equipped with the mounting hole on the interior oil fender two 10, the screw rod passes two 10 and push-and-pull rod 2 of fixed interior oil fender of mounting hole.

The utility model discloses according to 2 sizes of push-and-pull rod install interior oil fender 4 additional between cooling sleeve 1 and sealing ring 5, install a convex oil fender 9 additional on 1 upper portion of bearing box, shelter from oil spout to 2 departments of push-and-pull rod to 2 axial of push-and-pull rod, radially play respectively and keep off oily effect.

The utility model discloses install packing 6 additional in the 2 outsides of push-and-pull rod, further improve sealed effect to preparation packing gland 7 compresses tightly it, the oil impregnate volume that has significantly reduced.

While the preferred embodiments of the present invention have been described, it is to be understood that the invention is not limited to the precise embodiments described, and that equipment and structures not described in detail are understood to be practiced as commonly known in the art; any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention will still fall within the protection scope of the technical solution of the present invention by those skilled in the art without departing from the technical solution of the present invention.

Claims

1. The sealing structure of the push-pull rod of the steam turbine is characterized by comprising a push-pull rod arranged on a bearing box, a cooling sleeve arranged on the push-pull rod, a first sealing mechanism arranged between the cooling sleeve and the push-pull rod, a second sealing mechanism arranged between the push-pull rod and the bearing box and a third sealing mechanism arranged in the bearing box, wherein an oil return pipe is arranged on the cooling sleeve, an opening of the oil return pipe is downwards connected with the bearing box, the first sealing mechanism comprises a sealing ring and a first inner oil baffle, the first sealing mechanism is arranged between the push-pull rod and the cooling sleeve in a gapless manner, the second sealing mechanism comprises a sealing ring, a packing and a packing gland, the sealing ring, the packing and the packing gland are sequentially arranged between the bearing box and the push-pull rod from inside to outside, and the third sealing mechanism comprises a sealing ring and a second inner oil baffle which are arranged at two ends of the push-pull rod from inside to outside.

2. The steam turbine push-pull rod sealing structure according to claim 1, wherein the upper portion of the bearing box is further provided with an arc-shaped oil stop which is arranged at the joint of the push-pull rod and the bearing box to further enhance the sealing performance and prevent oil from spraying to the push-pull rod, so that the oil leakage probability is reduced.

3. The steam turbine push-pull rod sealing structure as claimed in claim 2, wherein the third sealing mechanism further comprises a baffle reinforcing ring, and the baffle reinforcing ring is made of stainless steel and is sleeved and fixed outside the second inner oil stop.

4. The steam turbine push-pull rod seal structure of claim 3, wherein the packing is a graphite nickel wire packing.

5. The steam turbine push-pull rod sealing structure as claimed in claim 4, wherein the packing gland is composed of a ring with an opening at one end and a bolt connected with the opening of the ring, so that tightness can be conveniently adjusted.

6. The steam turbine push-pull rod sealing structure as claimed in claim 5, wherein a plurality of threaded rods are symmetrically arranged outside the push-pull rod inside the bearing box, the second inner oil retainer is provided with mounting holes, and the threaded rods penetrate through the mounting holes to fix the second inner oil retainer and the push-pull rod.