CN216843114U - Sealing device for spiral propeller and hot air box of coal mill - Google Patents

Abstract

The utility model relates to a sealing device for a screw propeller and a hot air box of a coal mill. The utility model provides a sealing device of screw propeller and hot-blast box of coal pulverizer, the center of hot-blast box has the through-hole, screw propeller's pivot is followed the through-hole is worn out and is supported by the propeller bearing, sealing device establishes including the cover establish in the pivot and be located the pivot sealing ring in the through-hole outside, a serial communication port, sealing device still includes seal box and sealed wind pipeline, the seal box cover is established on the through-hole and with hot-blast box is connected as an organic whole, the seal box has and can hold the pivot sealing ring with the inner chamber of propeller bearing, sealed wind pipeline intercommunication to the inner chamber of seal box, to let in sealed cooling air in the sealed wind pipeline. The sealing device of the utility model can reduce the temperature of the working space of the propeller bearing, thereby prolonging the service life of the propeller bearing, and can also prevent the pollution caused by the leakage of the coal dust to the working site.

Description

Sealing device for spiral propeller and hot air box of coal mill

Technical Field

The utility model belongs to the technical field of maintenance of boiler auxiliary machines in thermal power plants, and particularly relates to a sealing device for a coal mill spiral propeller and a hot air box.

Background

Coal mills are machines that break up coal briquettes and grind them into coal fines, and are important auxiliary equipment for coal powder furnaces. The raw coal is fed into the mixing box from the hopper through the automatic control weighing coal feeder, is pre-dried by bypass air, falls to the inlet on the side surface of the spiral conveyor through the coal dropping pipe, and is fed into the rotating cylinder body by the rotation of the spiral conveying device. The coal mill drives the barrel to rotate by the motion of a main motor through a speed reducer and an open gear. A certain number of steel balls are arranged in the cylinder, and pulverized coal is ground into pulverized coal through the impact and friction between the steel balls and the coal.

Fig. 1 is a schematic structural diagram of a sealing structure of a hot air box of a conventional coal mill, as shown in fig. 1, when the coal mill works, a rotary shaft 1 of a spiral propeller and a hot air box 2 penetrate through the position, and are sealed by a sealing ring 4 and a graphite nickel wire packing of 20mm, a sealing air pipeline 3 is additionally arranged on the sealing ring 4, sealing air is introduced into the sealing air pipeline 3 to prevent hot air inside the coal mill from directly blowing a spiral propeller bearing 5, and the rotary shaft 1 of the spiral propeller rotates for a long time to rub against the sealing ring 4 because the sealing ring 4 is in a static state, so that the packing is easily damaged, air leakage at the rotary shaft 1 of the spiral propeller of the coal mill is caused, the spiral propeller bearing 5 of the coal mill is exposed to the hot air for a long time, and the service life of the spiral propeller bearing is shortened; moreover, the pulverized coal leaks to the working site, causing pollution.

SUMMERY OF THE UTILITY MODEL

In view of the defects of the prior art, the utility model provides a sealing device for a coal mill screw propeller and a hot air box, which aims to solve the problems that a bearing of the coal mill screw propeller works after being exposed in hot air for a long time and coal dust leaks to a working site to cause pollution.

The utility model provides a coal pulverizer screw propeller and hot-blast box's sealing device, the center of hot-blast box has the through-hole, screw propeller's pivot is followed the through-hole is worn out and is supported by the propeller bearing, sealing device establishes including the cover in the pivot and lie in the pivot sealing ring in the through-hole outside, sealing device still includes seal box and sealed wind pipeline, the seal box cover is established on the through-hole and with hot-blast box is connected as an organic wholely, the seal box has can hold the pivot sealing ring with the inner chamber of propeller bearing, sealed wind pipeline intercommunication extremely the inner chamber of seal box.

Preferably, the seal box is a square box with one open side, and the open side and the hot air box are welded into a whole.

Preferably, an access hole is formed in the end face, opposite to the opening face, of the sealing box; the sealing box is further provided with a sealing cover, and the sealing cover is detachably connected to the end face and used for sealing the access hole.

Preferably, the sealing cover is detachably attached to the end face by means of bolts.

Preferably, the projection area of the end face on the hot air box is larger than the projection area of the opening face of the sealing box on the hot air box.

Preferably, the sealing cover has the same shape and size as the end face.

Preferably, the shape of the access hole is square, and the side length of the access hole is 60-70 mm.

Preferably, the seal box is formed by welding flat steel plates, and the thickness of each steel plate is more than 4 mm.

Preferably, cooling sealing air is introduced into the sealing air pipeline.

According to the sealing device for the spiral propeller and the hot air box, the sealing box capable of containing the shaft sealing ring and the propeller bearing is arranged on the outer side of the through hole of the hot air box in a covering mode, and the high-pressure cooling air is introduced into the inner cavity of the sealing box through the sealing air duct, so that on one hand, the hot air in the hot air box can be effectively prevented from leaking out through the control of air pressure, on the other hand, the temperature of the working space of the propeller bearing can be reduced, the service life of the spiral propeller bearing is prolonged, and in addition, the pollution caused by the fact that coal dust leaks to a working site can be prevented.

Drawings

FIG. 1 is a schematic structural view of a sealing structure of a hot air box of a conventional coal mill;

FIG. 2 is a schematic structural diagram of a sealing device provided in an embodiment of the present invention;

fig. 3 is a right side view of a seal arrangement provided by an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in detail below with reference to the accompanying drawings. Examples of these preferred embodiments are illustrated in the accompanying drawings. The embodiments of the utility model shown in the drawings and described in accordance with the drawings are exemplary only, and the utility model is not limited to these embodiments.

It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the scheme according to the present invention are shown in the drawings, and other details not so relevant to the present invention are omitted.

The embodiment of the utility model provides a sealing device for a spiral propeller and a hot air box of a coal mill, as shown in fig. 1, a through hole 21 is formed in the center of the hot air box 2, a rotating shaft 1 of the spiral propeller penetrates out of the through hole 21 and is supported by a propeller bearing 5, and the sealing device comprises a rotating shaft sealing ring 4 which is sleeved on the rotating shaft 1 and is positioned outside the through hole 21.

In this embodiment, the sealing device further includes a sealing box 6 and a sealing air pipeline 3, the sealing box 6 covers the outer side of the through hole 21 and is connected with the hot air box 2 into a whole, the sealing box 6 has an inner cavity 61 capable of accommodating the rotating shaft sealing ring 4 and the propeller bearing 5, and the sealing air pipeline 3 is communicated to the inner cavity 61 of the sealing box 6.

The sealing device of the above embodiment, compare with current seal structure, establish the seal box 6 that can hold axle sealing ring 4 and propeller bearing 5 through covering on the through-hole 21 outside at hot-blast box 2, the inner chamber 61 of rethread seal wind pipeline 3 to seal box 6 lets in high-pressure cooling wind, thereby the control through the wind pressure can prevent hot-blast in the hot-blast box 2 to spill effectively on the one hand, thereby on the other hand can reduce propeller bearing 5 working space's temperature and prolonged the life of helical propeller bearing 5, can also prevent in addition that the buggy from revealing the pollution that the job site caused.

In this embodiment, as shown in fig. 2, the sealing box 6 is preferably a square box with an opening on one side, and the opening side is welded to the hot air box 2 as a whole.

In this embodiment, as shown in fig. 2 and 3, fig. 3 is a right side view of the sealing device corresponding to fig. 2. An end surface 62 of the sealing box 6 opposite to the opening surface is provided with an access hole 63; the sealing box 6 is further provided with a sealing cover 7, and the sealing cover 7 is detachably connected to the end surface 62 and used for closing the access hole 63. Note that, as shown in fig. 3, the seal box 6, the access hole 63, the propeller bearing 5, and the shaft seal ring 4 are shown by a broken line diagram below the seal cover 7. Through setting up inspection hole 63 can be located more conveniently each part of seal box 6 carries out the maintainer.

Preferably, the sealing cover 7 has the same shape and size as the end surface 62, and can provide a good sealing function for the manhole 63.

Preferably, as shown in fig. 3, the access hole 63 is square, and has a side length of 60mm to 70mm, preferably 60mm × 60mm, so as to facilitate daily access to the bearing.

In a further preferred embodiment, as shown in fig. 3, the sealing cover 7 is detachably connected to the end surface 62 by bolts 8.

In a further preferred embodiment, as shown in fig. 2, a projected area of the end surface 62 on the hot air box 2 is larger than a projected area of an opening surface of the seal box 6 on the hot air box 2, that is, a peripheral edge of the end surface 62 has a protruding portion with respect to the opening surface of the seal box 6. In a further preferred embodiment, the sealing box 6 is formed by welding flat steel plates, and the thickness of the steel plates is 4mm or more, preferably 5mm, which facilitates the manufacturing of the sealing box 6.

In a further preferred aspect, the sealing box 6 is made of the same material as the hot air box 2, so as to facilitate welding between the sealing box 6 and the hot air box 2.

In a further preferred scheme, as shown in fig. 2, cooling seal air is introduced into the seal air pipeline 3, so that the temperature in the seal box 6 is not higher than 70 ℃, the temperature in the seal box 6 is reduced, the normal operation of the bearing 5 and the seal ring 4 packing is ensured, and the replacement frequency of the seal ring 4 packing is reduced.

In summary, according to the sealing device for the spiral propeller and the hot air box provided by the utility model, the sealing box capable of accommodating the shaft sealing ring and the propeller bearing is arranged on the outer side of the through hole of the hot air box in a covering manner, and the high-pressure cooling air is introduced into the inner cavity of the sealing box through the sealing air duct, so that on one hand, the hot air in the hot air box can be effectively prevented from leaking out through the control of the air pressure, on the other hand, the temperature of the working space of the propeller bearing can be reduced, the service life of the spiral propeller bearing is prolonged, and in addition, the pollution caused by the leakage of pulverized coal to the working site can be prevented.

While the foregoing is directed to embodiments of the present application, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the application and should be considered as within the scope of the application.

Claims (8)

1. A sealing device for a screw propeller and a hot air box of a coal mill is characterized in that a through hole (21) is formed in the center of the hot air box (2), the rotating shaft (1) of the spiral propeller penetrates out of the through hole (21) and is supported by a propeller bearing (5), the sealing device comprises a rotating shaft sealing ring (4) which is sleeved on the rotating shaft (1) and is positioned outside the through hole (21), it is characterized in that the sealing device also comprises a sealing box (6) and a sealing air pipeline (3), the sealing box (6) is covered on the through hole (21) and is connected with the hot air box (2) into a whole, the sealing box (6) is provided with an inner cavity (61) which can accommodate the rotating shaft sealing ring (4) and the propeller bearing (5), the sealing air pipeline (3) is communicated to an inner cavity (61) of the sealing box (6), and sealing cooling air is introduced into the inner cavity (61).

2. The sealing device according to claim 1, characterized in that the sealing box (6) is a square box with an open face, and the open face is welded with the hot air box (2) into a whole.

3. A sealing device according to claim 2, characterized in that the end face (62) of the sealing box (6) opposite to the opening face is provided with a service hole (63); the sealing box (6) is further provided with a sealing cover (7), and the sealing cover (7) is detachably connected to the end face (62) and used for closing the access hole (63).

4. A sealing arrangement according to claim 3, characterized in that the sealing cover (7) is detachably connected to the end face (62) by means of bolts (8).

5. A sealing arrangement according to claim 3, characterized in that the projected area of the end surface (62) on the hot-air box (2) is larger than the projected area of the sealing box (6) opening surface on the hot-air box (2).

6. Sealing device according to claim 5, characterized in that the sealing cover (7) has the same shape and size as the end face (62).

7. A sealing arrangement according to claim 3, characterized in that the manhole (63) is square in shape with sides of 60-70 mm.

8. The sealing device according to claim 2, wherein the seal box (6) is formed by welding flat steel plates having a thickness of 4mm or more.

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