RU2646277C1 - Radial blower - Google Patents

Abstract

FIELD: instrumentation; ventilation.

SUBSTANCE: radial blower that comprises the spiral housing with the impeller, which is fixed to the end of the cantilever shaft, supported by two bearing assemblies, which are mounted at the distance from each other, the section of the cantilever shaft that is located between the bearing assemblies is placed in the protective casing, which covers the cantilever shaft in the axial direction, while the protective cover is fully or partially open from both ends, the inner cavity of the protective casing is divided into two separate internal cavities that face the corresponding bearing assemblies, by means of the partition wall provided with the opening that allows for the cantilever shaft to pass through it, through holes are provided on either side of the partition wall in the protective casing, in order to provide air supply to each separate inner cavity of the casing, the impeller is rigidly fixed in each separate inner cavity of the casing, in the respective shaft section, it is designed in order to supply air from through holes to the adjacent bearing assembly through the fully or partially open end of the casing.

EFFECT: technical result, which is achieved by the invention, is the increased cooling efficiency of the bearing assemblies, increased safety.

3 cl, 1 dwg

Description

The invention relates to radial fans equipped with a cooling device for bearing assemblies.

Known radial fan with an air cooling device designed to cool bearing assemblies with any type of lubricant. The principle of operation of the air-cooling device is based on the removal of heat generated as a result of the work of friction forces into the hollow shaft journal, through which, with the help of an additional fan mounted on the shaft, cold air is blown from the surrounding area through an opening located on the free end of the journal (Commissar A.G. Rolling bearings in heavy duty operation: a Handbook. M.: Mechanical Engineering, 1987. 384 p.). The disadvantage of this device is that the device can only be used to cool bearings located on the shaft pins extending into the surrounding space.

Known radial fan according to patent No. 92113 for a utility model containing a spiral housing, an impeller connected by a shaft passing through the rear wall of the housing with a bearing assembly, equipped with a cooling device and kinematically connected to the energy drive, while the cooling device is made in the form of a disk mounted on the shaft between the bearing assembly and the rear wall of the housing. The disk is made in the form of an impeller directing the air flow from the rear wall of the housing towards the bearing assembly; several disks are installed on the shaft, each of which has through holes; through holes on the disks are made misaligned.

The disadvantage of the radial fan according to patent No. 92113 is its lack of reliability and safety due to the inefficiency of cooling the bearing assembly when two bearing assemblies are installed at a distance from each other, as well as due to the lack of a protective casing on rotating parts.

The radial fan according to patent No. 92113 is selected as the closest analogue (prototype).

The technical problem solved by the present invention is the safety and reliability of the radial fan.

The technical result achieved by the invention is to increase the cooling efficiency of bearing assemblies, to increase safety.

The claimed technical result is achieved due to the fact that in the radial fan, containing a spiral housing with an impeller, mounted on the end of the cantilever shaft, supported by two bearing assemblies mounted at a distance from each other, a section of the cantilever shaft located between the bearing assemblies is located in a protective casing covering the cantilever shaft in the axial direction, while the protective casing is fully or partially open from both ends, the inner cavity of the protective casing is divided into two separate internal cavities facing the respective bearing units by means of a dividing wall made with an opening allowing the cantilever shaft to pass through it, through holes are made on both sides of the dividing wall in the protective casing to provide air supply to each individual internal cavity of the casing, in each a separate internal cavity of the casing in the corresponding section of the shaft is rigidly fixed impeller, designed to supply air from through holes to the adjacent at the bearing assembly through the fully or partially open end of the casing.

Through holes can be made slit-like.

Each impeller can be located between the through holes in the casing, on the one hand, and an adjacent bearing assembly, on the other hand.

The inventive radial fan contains a spiral casing and an impeller mounted on a cantilever shaft, supported by two bearing units mounted at a certain distance from each other. A section of the shaft located between the bearing units is placed in a protective casing, open completely or partially from the ends. The general internal cavity of the protective casing is provided with a partition made with a central hole that allows the cantilever shaft of the fan to pass through it. The partition divides the common internal cavity of the protective casing into two separate internal cavities. Through-holes are made in the protective casing, providing external air to each individual internal cavity. Each section of the shaft located in the corresponding separate internal cavity is equipped with an impeller (cooling impeller), which provides a directed air supply from the through holes to the bearing assembly located at the adjacent end of the shaft when the shaft rotates. It is advisable to make through holes in the protective casing on both sides of the partition in such a way that each impeller is located in a corresponding separate internal cavity between the through holes in the casing on the one hand and the neighboring (nearest, adjacent) bearing assembly on the other hand, to provide a more efficient supply of external air to an adjacent bearing assembly. Through holes, it is advisable to make slit-like to ensure the maximum air volume can be fed into the inner cavity of the casing. When the fan is operating, the outside air entering the inside of the casing is carried away by the impellers and sent through the open ends of the casing to the bearing unit adjacent to the corresponding impeller. Cooling of the bearing assemblies is achieved by removing heat generated as a result of the friction forces in the bearings to the environment by air flows supplied by cooling impellers and flowing around the bearing assemblies from the outside.

The invention is illustrated in the drawing.

The inventive radial fan of FIG. contains:

1 - spiral case;

2 - impeller;

3 - cantilever shaft;

4 and 5 - bearing units;

6 and 7 - cooling impellers;

8 - a protective casing;

9 - dividing wall;

10 - through slit-like holes.

The arrows indicate the direction of movement of the cooling air.

The spiral housing 1 and the impeller 2 are mounted on a shaft 3, supported by two bearing units 4 and 5, mounted at a certain distance from each other. The shaft portion 3 located between the bearing units 4 and 5 is closed by a protective casing 8, the ends of which are fully or partially open. Inside the casing 8, a dividing wall 9 is installed, dividing the general internal cavity of the casing into two separate internal cavities. The partition 9 is made with an opening allowing shaft 3 to pass through it. On both sides of the partition 9 in the protective casing 8 there are through slit-like openings 10 through which external air penetrates into the internal cavity of the casing 8. The shaft 3 is provided with impellers 6 and 7, each of which is located in the corresponding separate internal cavity.

During operation, the cooling impellers 6 and 7, mounted and fixed on the shaft 3, are rotated, as a result of which under the protective casing 8 in each separate internal cavity on both sides of the partition 9 there is a vacuum, which causes the flow of external air into the internal cavity of the casing 8. Outside air enters under the protective cover through the slotted holes 10, is carried away by the impellers 6 and 7 and is supplied to the bearing assemblies 4 and 5. In this case, the separating partition 9 prevents the mixing of air flows, p coming to the impellers 6 and 7, which ensures the stability and reliability of their work. After impellers 6 and 7, excess pressure air continues to move in the axial direction and flows around bearing assemblies 4 and 5. Heat generated as a result of the friction forces in bearing assemblies 4 and 5 is transferred as a result of convective heat exchange to air flows and dissipates in the environment.

The inventive radial fan is simple and reliable, provides efficient cooling of the bearing assemblies, and also ensures safety during operation.

Claims (3)

1. A radial fan, comprising a spiral housing with an impeller, mounted on the end of a cantilever shaft, supported by two bearing assemblies mounted at a distance from each other, a section of the cantilever shaft located between the bearing assemblies is placed in a protective casing covering the cantilever shaft in the axial direction, while the protective casing is fully or partially open from both ends, the inner cavity of the protective casing is divided into two separate internal cavities facing the corresponding bearing through the partition, made with an opening that allows the cantilever shaft to pass through it, through holes are made on both sides of the partition in the protective casing to ensure air supply to each separate internal cavity of the casing, in each separate internal cavity of the casing in the corresponding section the impeller is rigidly fixed, designed to supply air from the through holes to the adjacent bearing unit through a fully or partially open torus q casing. 2. The radial fan according to claim 1, characterized in that the through holes are slotted. 3. The radial fan according to claim 1, characterized in that each impeller is located between the through holes in the casing, on the one hand, and an adjacent bearing assembly, on the other hand.

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