CN216923201U - A steam turbine bearing box sealing device - Google Patents

Abstract

The utility model discloses a sealing device for a bearing box of a steam turbine, which comprises a transmission shaft, a bearing box and an oil baffle body, wherein both ends of the inside of the oil baffle body are provided with a labyrinth sealing element and an elastic component, the labyrinth sealing element and the elastic component are connected to the outer surface of the transmission shaft, and a sealing ring is arranged between one end of the labyrinth sealing element, which is far away from the transmission shaft, and the other end of the labyrinth sealing element; through labyrinth seal spare, cooperation between elastic component and the sealing washer, to forming fine seal structure between oil baffle body and the transmission shaft, dust in can avoiding the air gets into the friction between inside increase of bearing box and the transmission shaft, can prevent effectively that outer hourglass's phenomenon from appearing in lubricating oil, thereby prevent to cause the conflagration because of the splash of lubricating oil, prevent that outside steam from getting into inside the bearing box simultaneously, emulsify to lubricating oil and reduce its quality of use, use through heat radiation fins, derive the heat that the transmission shaft initiative produced fast, avoid high temperature damage transmission shaft, and then improve the life of transmission shaft.

Description

A steam turbine bearing box sealing device

technical field

The utility model relates to the field of steam turbine bearing box sealing, in particular to a steam turbine bearing box sealing device.

Background technique

A steam turbine, also known as a steam turbine engine, is a rotary steam power device. The high-temperature and high-pressure steam passes through a fixed nozzle to become an accelerated airflow and then sprays it onto the blades, so that the rotor with the blade row rotates and does external work at the same time; the steam turbine is a modern The main equipment of thermal power plants, in order to prevent the leakage of lubricating oil in the bearing chamber of the steam turbine, is now generally used with an oil block seal, whose function is to prevent the leakage of lubricating oil in the bearing chamber or the entry of external steam.

However, in the long-term operation of the steam turbine, the vibration of the normal operation of the unit and the vibration of the critical speed, the transmission shaft will rub against the oil block, causing the gap between the oil block and the bearing shaft diameter to increase, causing the turbine lubricating oil to leak from the gap, and the steam turbine will work more In the high temperature environment, the leakage of lubricating oil will cause a fire hazard. For this reason, we propose a sealing device for the bearing box of a steam turbine.

Utility model content

In order to overcome the deficiencies of the prior art, the utility model provides a sealing device for the bearing box of a steam turbine, which can solve the vibration of the steam turbine during long-term operation, normal operation of the unit and vibration when the critical speed is exceeded, and the transmission shaft will rub against the oil block, causing oil The gap between the block and the shaft diameter of the bearing increases, resulting in the leakage of the steam turbine lubricating oil from the gap.

In order to achieve the above purpose, the technical scheme adopted by the present invention is as follows: a sealing device for a steam turbine bearing box, comprising a transmission shaft, a bearing box and an oil blocking body, and both ends of the oil blocking body are provided with labyrinth seals and elastic components , the labyrinth seal and the elastic component are both connected to the outer surface of the transmission shaft, and a sealing ring is arranged between one end of the labyrinth seal away from the transmission shaft and therebetween.

As a preferred technical solution of the present invention, the elastic component includes an elastic sealing ring, and a spring is fixed inside the elastic sealing ring.

As a preferred technical solution of the present invention, an air groove is formed between the labyrinth seal and the elastic component, one end of the air groove is sealed with an air delivery pipe, and the surface of the air delivery pipe is provided with an automatic control valve. A first cut-off valve and a second cut-off valve are respectively provided on the surfaces of the gas pipes at both ends of the regulating valve.

As a preferred technical solution of the present invention, the surface of the self-control regulating valve is connected with a pressure indicator, and the surface of the gas transmission pipe is connected with a gas pressure controller.

As a preferred technical solution of the present invention, cooling fins are fixed equidistantly on the outer side wall of the oil baffle.

Compared with the prior art, the utility model has the following beneficial effects:

(1) The beneficial effect of the utility model is that the transmission shaft rotates under the support of the bearing housing, and through the cooperation between the labyrinth seal, the elastic component and the sealing ring, a good seal is formed between the oil blocking body and the transmission shaft. The structure can prevent the dust in the air from entering the inside of the bearing box and increase the friction between the bearing box and the transmission shaft, which can effectively prevent the leakage of lubricating oil, thereby preventing the fire caused by the splashing of lubricating oil, and preventing the entry of external steam. Inside the bearing housing, the emulsification of lubricating oil reduces the quality of its use. Through the use of heat dissipation fins, the heat actively generated by the drive shaft is quickly exported to avoid high temperature damage to the drive shaft, thereby improving the service life of the drive shaft.

(2) The beneficial effect of the present utility model is: the gas is introduced into the air groove through the gas pipe, and the sealing structure is pressurized with the use of the pressure controller and the first cut-off valve, and an annular high pressure is formed between the transmission shaft and the bearing box. Air zone, the annular high-pressure air zone forms an air seal ring between the oil block and the drive shaft, which further improves the seal between the bearing housing and the drive shaft. It is extruded from the gap of the air, and the oil cannot be accumulated near the labyrinth seal under the scouring of the air, keeping the labyrinth seal clean, reducing the maintenance and cleaning frequency of the staff, and greatly saving manpower.

Description of drawings

Fig. 1 is the structural representation of the utility model;

2 is a schematic structural diagram of an elastic assembly of the present invention;

Among them, the names corresponding to the reference numerals are: 1. Transmission shaft; 2. Bearing box; 3. Oil block; 4. Labyrinth seal; 5. Elastic component; 6. Air groove; 7. Air pipe; 8. Section A globe valve; 9, automatic control valve; 10, the second globe valve; 11, pressure indicator; 12, sealing ring; 13, elastic sealing ring; 14, spring.

Detailed ways

In order to make the technical means, creative features, goals and effects realized by the present utility model easy to understand, the present utility model will be further described below in conjunction with specific embodiments, but the following embodiments are only preferred embodiments of the present utility model, not all . Based on the examples in the implementation manner, other examples obtained by those skilled in the art without creative work are all within the protection scope of the present invention. The experimental methods in the following examples are conventional methods unless otherwise specified, and the materials, reagents, etc. used in the following examples can be obtained from commercial sources unless otherwise specified.

Example 1

Please refer to FIG. 1 and FIG. 2 , the present utility model provides a sealing device for a steam turbine bearing box, including a transmission shaft 1, a bearing box 2 and an oil block body 3, the bearing box 2 and the oil block body 3 are fixedly connected by bolts, and The transmission shaft 1 runs through the interior of the oil baffle body 3. Both ends of the oil baffle body 3 are provided with a labyrinth seal 4 and an elastic assembly 5. Both the labyrinth seal 4 and the elastic assembly 5 are connected to the outer surface of the transmission shaft 1. The labyrinth seal 4 A sealing ring 12 is provided at one end away from the transmission shaft 1 and therebetween; the elastic component 5 includes an elastic sealing ring 13, a spring 14 is fixed inside the elastic sealing ring 13, and cooling fins are fixed equidistantly on the outer side wall of the oil baffle 3;

The transmission shaft 1 rotates under the support of the bearing housing 2, and through the cooperation between the labyrinth seal 4, the elastic component 5 and the sealing ring 12, a good sealing structure is formed between the oil blocking body 3 and the transmission shaft 1, which can avoid The dust in the air enters the bearing housing 2 to increase the friction with the drive shaft 1, which can effectively prevent the leakage of the lubricating oil, thereby preventing the fire caused by the splashing of the lubricating oil, and preventing the external steam from entering the bearing housing. 2 Internally, the emulsification of lubricating oil reduces the quality of its use. Through the use of heat dissipation fins, the heat actively generated by the transmission shaft 1 is quickly exported to avoid high temperature damage to the transmission shaft 1, thereby improving the service life of the transmission shaft 1.

Example 2

Please refer to FIG. 1 , the other parts of the second embodiment are the same as the embodiment of the first embodiment, the difference is that the present invention provides a sealing device for a steam turbine bearing box, and the labyrinth seal 4 and the elastic component 5 are formed between Air groove 6, one end of air groove 6 is sealed and connected with gas delivery pipe 7, the surface of gas delivery pipe 7 is provided with self-control regulating valve 9, and the surface of gas delivery pipe 7 at both ends of self-controlling regulating valve 9 is provided with first cut-off valve 8 and second cut-off valve 10 respectively , the surface of the self-control regulating valve 9 is connected with a pressure indicator 11, and the surface of the gas transmission pipe 7 is connected with a gas pressure controller;

The gas is introduced into the air groove 6 through the air pipe 7, and the sealing structure is pressurized with the use of the pressure controller, the first stop valve 8 and the second stop valve 10, and an annular high pressure is formed between the transmission shaft 1 and the bearing box 2. The air area, the annular high-pressure air area forms an air seal ring between the oil blocking body 3 and the transmission shaft 1, which further improves the sealing between the bearing housing 2 and the transmission shaft 1. At the same time, the use of the pressure indicator 11 is convenient for the sealing structure Observation of the pressure value; while the gas is continuously injected, the air is squeezed out from the gap between the labyrinth seal 4 and the drive shaft 1. Under the flushing of the air, the oil cannot accumulate near the labyrinth seal 4, and the labyrinth seal 4 is maintained. cleaning.

The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Under the premise of the spirit and scope, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the claimed invention. The claimed scope of the present invention is defined by the appended claims and their equivalents.

Claims (5)

1. The utility model provides a steam turbine bearing box sealing device, includes transmission shaft (1), bearing box (2) and oil baffle body (3), its characterized in that, oil baffle body (3) inside both ends all are equipped with labyrinth seal spare (4) and elastic component (5), labyrinth seal spare (4) and elastic component (5) all connect in transmission shaft (1) surface, labyrinth seal spare (4) are kept away from transmission shaft (1) one end and are equipped with sealing washer (12) between it.

2. The steam turbine bearing housing seal arrangement according to claim 1, characterized in that the resilient assembly (5) comprises a resilient sealing ring (13), the resilient sealing ring (13) having a spring (14) fixed inside.

3. The sealing device for the bearing box of the steam turbine according to claim 1, wherein an air groove (6) is formed between the labyrinth seal (4) and the elastic component (5), one end of the air groove (6) is connected with an air conveying pipe (7) in a sealing manner, the surface of the air conveying pipe (7) is provided with an automatic control regulating valve (9), and the surfaces of the air conveying pipes (7) at two ends of the automatic control regulating valve (9) are respectively provided with a first stop valve (8) and a second stop valve (10).

4. The steam turbine bearing box sealing device according to claim 3, wherein a pressure display (11) is connected to the surface of the automatic control regulating valve (9), and a gas pressure controller is connected to the surface of the gas conveying pipe (7).

5. The steam turbine bearing housing seal according to claim 1, characterized in that the oil baffle (3) has fins fixed on the outer side wall at equal intervals.

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