SU1451351A1 - Fan - Google Patents

Abstract

The invention makes it possible to simplify the design, improve serviceability and expand the scope of application of the fan. The fan includes a housing mounted on a shaft 2 of a driving electric motor 3, a wheel with a disk 4 and blades and a labyrinth seal made in the form of radial rings arranged centrally to the protrusions of the disk 4 in contact with the outer surface of the groove sidewall and positioned with an inner surface with a gap relative to the outer surface of the annular protrusions of the disk 4, and part of the rings made in the form of filter elements. On the inner side 19, the protrusions 11 of the impeller disk 4 can be provided with involute grooves with a variable cross-sectional area and the reverse of the direction of rotation of the impeller to provide backwater in the labyrinth seal. As the working fluid flows through the labyrinth seal, the bearing wear products will be held by the labyrinth rings and filter elements. 1 h. n f-ly 3 Il. with S (L

Description

 SP

coke

This invention relates to a torus valve.

The purpose of the invention is to simplify the design, improve serviceability and expand the scope of application of the fan.

FIG. 1 depicts a fan, OB-IV; in fig. 2 — node I in FIG. one; in fig. 3 is a view A of FIG. 2

The fan includes a housing 1 installed in the housing 1 on the shaft 2 of the drive motor 3, an impeller with a disk 4 and blades 5 and a labyrinth seal, separating the cavity 6 of the motor 3 from the flow part 7. The fan further comprises a female motor 3 cylinder 8 located in the housing 1 with the formation of the annular channel 9 in front of the impeller and having from the side of the impeller annular end grooves 10, the disk 4 of the impeller is equipped with annular axial protrusions 11 placed in the grooves 10, and la The biirint seal is made in the form of separate radial rings 12 arranged concentrically to the protrusions 11 of the disk 4 contacting the outer surface 13 with the side wall 14 of the groove 10 and placed with the inner surface 15 with a gap 16 relative to the outer surface 17 of the annular projections 11 of the disk 4 in the form of filter elements 18.

On the inner side 19, the protrusions 11 of the impeller disk 4 can be provided with involute grooves 20 with a variable cross-sectional area and the reverse of the direction of rotation of the impeller.

In addition, the labyrinth seal includes spacer rings 21, a cover 22 and mounting screws 23.

When the impeller is rotated by an electric motor 3, a reduced pressure zone is created in front of the impeller. The wear products of the electric motor 3 and the lubricants of the bearing assemblies will tend to move under the action of a pressure differential in this zone. However, a labyrinth seal in the form of rings 12 installed in their path will retain large particles. Smaller particles will be held by rings in the form of filter elements 18 (made, for example, from a mesh).

In addition, the involute grooves 20 formed on the inner side 19 of the protrusions 11 of the disk 4 will create backwater and keep the contamination products in the labyrinth seal when the impeller rotates.

Such an embodiment of the fan allows to simplify the design, improve the serviceability when cleaning the labyrinth seal from wear products and expand the field of application of the fan in devices with increased requirements.

Claims (2)

1. A fan comprising a housing, an impeller with a disk and blades mounted on the drive motor shaft, and a labyrinth seal separating the motor cavity from the flow passage, characterized in that, in order to simplify the design, increase convenience maintenance and expansion of the field of application, the fan further comprises a cylinder enclosing the electric motor, located in the housing to form an annular channel in front of the impeller and having annular end grooves on the latter side, the impeller disk is provided with annular axial projections placed in the ducts, and the labyrinth seal is made in as separate radial rings arranged concentrically to the protrusions of the disk in contact with the outer surface of the groove sidewall and placed an inner surface with a gap relative to the outer surface of the annular drive protrusions, wherein the portion of the rings is formed as a filter elem; ntov. 2. Fan according to Claim 1, characterized in that on the inner side, the protrusions of the impeller disk are provided with involute grooves with a variable cross-sectional area and in the opposite direction rotation of the impeller. g GZ 70 V-}  .U srig.1 20 Disclosure Vdashchen J SoJio Elele / 77ro g cg / Leu go eleven Fig.z