RU73719U1 - MAIN AXIAL MINING FAN - Google Patents

Abstract

An axial shaft fan of the main ventilation is proposed, which has increased performance and is made in the form of a two-stage fan.

Each of its steps has an aerodynamic shell. It contains an electric motor in its own explosion-proof enclosure, which is placed in the capsule. The capsule has an aerodynamic shape. It is consistent with the shape of the aerodynamic shell. The capsule is located inside the shell and is fixed in it on a set of appropriate supports. The ends of the aerodynamic shells are connected through a spacer, which, acting as a compression additive and an air flow equalizer, creates additional space between the fans and allows you to adjust the distance between the ends, for example, up to 250 mm. Such regulation increases pressure without increasing engine power, without changing the design dimensions of the impellers and with a stable air flow. The diameters of the impellers of the first and second stages are made of the same size, the impeller blades have a curved-sectoral-three-dimensional-orthogonal shape. This leads to an increase in fan performance by at least twenty to thirty percent. At the same time, noise is reduced in the operation of the fan and its service life is extended.

Description

This utility model relates to mine equipment that provides ventilation of a mine during mining, in particular removal of gases, dust and harmful substances from it.

A useful model is known “Axial shaft fan of the main ventilation of counter rotation” (RF Patent No. 43629, MKI F24H 1/20, publ. 2005.01.27), comprising an electric motor, a ventilation pipe, and an impeller with blades. The impeller is mounted directly on the motor shaft, and the ventilation pipe is located on the outside of the motor and impeller. The electric motor, ventilation pipe and impellers of two coaxially mounted fans form a two-stage fan, in which two impellers are located close to each other and

rotate in opposite directions, and the corresponding ends of the ventilation pipes are connected together.

There is an option in which the electric motor is surrounded by an explosion-proof housing, and the specified ventilation pipe is attached to the outside of the housing using a radial plate.

There is another option, according to which reflective rings are installed on the ends of the ventilation pipes connected to each other.

There is another option according to which the ratio of the diameters of the impellers of the second and first stages is from 1.02 to 1.20. In this case, the ventilation pipe of the second stage of the fan has a conical shape.

In the real design of this known axial shaft fan of the main ventilation, the blades of the impellers are teardrop-shaped and have a prefabricated steel structure (shank - side of the blade - bottom of the blade) on rivets.

This known utility model is selected as a prototype, since it has the largest number of essential features that match the essential features of the claimed utility model, and is aimed at solving the same problem that the claimed utility model solves. In addition, the prototype is actually manufactured and delivered to many mines in Russia, where it works.

However, the prototype has significant disadvantages, namely:

insufficiently high efficiency and low productivity, due to:

- the difference in size of the diameters of the impellers;

- the implementation of the blades of a drop-shaped form;

- fastening the electric motor to the casing of the ventilation pipe using a plate that does not take into account the aerodynamic features of the ventilation pipe;

- the lack of the ability to control the distance between the two stages of the fan;

- the presence of a turbulent, rigid air flow, which must be leveled to be uniformly fed into the mine.

The objective of this utility model is to improve the known design of the axial shaft fan of the main ventilation with the achievement of the following technical results:

- increase in efficiency;

- increase in productivity;

- ensuring smooth air flow.

The problem is solved as follows. In the well-known axial shaft fan of the main ventilation, containing coaxially mounted fans, forming a two-stage axial counter-rotation fan circuit in which each stage has a ventilation pipe, an electric motor in an explosion-proof own housing with an element of its fastening to the ventilation pipe, an impeller with blades mounted directly on shaft, while the ventilation pipes are connected through the ends, and the impeller blades have the corresponding shape, according to the present of a useful model, an aerodynamic shell made of metal is used as a ventilation pipe, the electric motor is placed in a capsule, which has a shape corresponding to the aerodynamic shell, and is attached to its inner side by means of an electric motor mount made in the form of a set of supports with aerodynamic forms, which evenly distributed over the surface of the capsule, the ends of the aerodynamic shells of the first and second stages are connected to each other through a spacer that performs the functions obavitelya equalizer compression and air flow, the diameters of the impellers of the first and second stages are made of the same size, and that the blades have a shape different from

drop-shaped, for example, curved-sectoral-three-dimensional-orthogonal.

This new technical solution allows you to create a new axial shaft fan of the main ventilation, ensuring the achievement of the following technical results:

- increase fan efficiency;

- increase in productivity;

- ensuring smooth air flow. In addition, it simplifies maintenance. This is achieved by the presence of significant distinctive features from the prototype features:

- applied aerodynamic shell made of metal, for example, steel or other durable alloy, which improves the conditions for the formation and movement of the air flow inside it;

- an electric motor in its own explosion-proof housing is placed in a capsule having an aerodynamic shape that is consistent with the shape of the aerodynamic shell, and the capsule itself is located inside and parallel to it, which also contributes to better conditions for moving the air flow inside the aerodynamic shell;

- used a set of supports having an aerodynamic shape and evenly distributed to connect the capsule with the inner surface of the aerodynamic shell, which increases the aerodynamic effect;

- the ends of the aerodynamic shells are connected through a spacer - a compression additive and an air flow equalizer, which creates additional space between the fans and allows you to adjust the distance between the ends, for example, up to 250 mm. This provides an increase in pressure without increasing engine power, without changing the structural dimensions of the impellers and with a stable smooth transition of the turbulence arising at the outlet of the impellers into a uniform air flow directed to the shaft;

- the diameters of the impellers of the first and second stages are made of the same size, which leads to a smooth and uniform creation of an air flow in the initial period of operation and to its stabilization at the outlet of the fan;

- the impeller blades have a shape different from the teardrop shape, for example, curved-sectoral-three-dimensional-orthogonal, which increases the fan performance by at least twenty-thirty percent, and at the same time reduces noise, extends the life of the fan;

- the blades of the impellers are made of alloy, in particular of aerolite, and are products formed by the casting method, which simplifies the design of the wheel and increases its manufacturability.

Thus, the aforementioned technical results are achieved due to changes and applications of aerodynamic forms in the fan design, as well as the introduction of an adjustable distance between the ends of the aerodynamic shells.

The applicant conducted a patent information search. He showed that the claimed combination of essential features is not known. Therefore, this useful model can be considered new.

The technical essence of the claimed utility model is illustrated in the drawing, where:

Figure 1 - General view of the proposed axial fan of the main ventilation;

Figure 2 - part of the connection of the ends of the aerodynamic shells of two stages of the fan.

The practical applicability of the claimed utility model is illustrated below by the following description.

The axial shaft fan of the main ventilation contains coaxially mounted fans 1 and 2, which form a circuit of a two-stage axial counter-rotation fan (Figs. 1, 2). AT

each stage 3 and 4 has a ventilation pipe 5, an electric motor 6 in its own explosion-proof housing 7, an impeller 8 with blades 9, mounted directly on the shaft of the electric motor 6 (Figure 1). As the ventilation pipe 5, an aerodynamic shell made of metal, for example, steel, is used. The electric motor 6 is placed in a capsule 10, which has a shape corresponding to the shape of the aerodynamic shell 5 (not shown in the drawing), and is attached to its inner side by means of a fastening element 11 of the electric motor 6, made in the form of a set of supports with an aerodynamic shape (not shown) . The supports 11 are evenly distributed over the surface of the capsule 10 and are connected to it at one end and the other to the inner surface of the aerodynamic shell 5. The electric motors 6 are aligned, i.e. on the same axis OO ¹ towards each other, and respectively 8 impellers rotate towards each other in opposite directions. The ends 12 of the aerodynamic shells 5 of the first and second stages 3 and 4 are connected to each other through a spacer 13, which performs the functions of a compression additive and an air flow equalizer (Figs. 1, 2). The spacer 13 may change its length (not shown in the drawing). The diameters of the impellers 8 of the first and second stages 3 and 4 are made of the same size. This allows you to evenly (without turbulence and surge) to supply air flow. The blades 9 of the impellers 8 have a curved-sectoral-three-dimensional-orthogonal shape, which differs from the teardrop shape (not shown in the drawing). With their help, the capacity is regulated, and the air pressure - by turning the blades in a horizontal plane at a certain angle (not shown in the drawing). The blades 9 are cast structures made, for example, of aerolite, the mass of which is close to aluminum alloys. As a result, the mass of the impeller is reduced, the load on the bearings is reduced.

impeller and electric motor; fan efficiency increases. The aerodynamic shell of the first and second stages has the same diameters. It serves as the main building for the entire installation of this axial main ventilation fan. At the exit of one of the steps to the aerodynamic shell by means of a flange connection (depending on the ventilation scheme), a flow rectifier is necessarily installed. He is responsible for the direction of the air flow without causing turbulence (not shown in the drawing).

Thus, in the design of the proposed axial shaft fan of the main ventilation applied counter-rotation of the impellers of two stages. These wheels are driven by an electric motor with an explosion-proof housing, which is located in the capsule. The direction of rotation of the two blades is the opposite. If you look at the impeller of the first stage, then it rotates clockwise, and the impeller of the second stage - counterclockwise. Air is sucked into the impeller of the first stage, transfers its energy to it and leaves the impeller of the second stage. The impeller of the second stage with the stator acts as a simple axial flow fan. The proposed axial shaft fan of the main ventilation has increased performance compared to the prototype.

Claims (1)

An axial shaft main ventilation fan, comprising coaxially mounted fans, forming a two-stage axial counter-rotation fan circuit, in which each stage has a ventilation pipe, an electric motor in an explosion-proof own housing with an element of its fastening to the ventilation pipe, an impeller with blades mounted directly on the shaft, while the ventilation pipes are connected through the ends, and the impeller blades have a corresponding shape, characterized in that in quality In the ventilation pipe, an aerodynamic shell made of metal was used, the electric motor was placed in a capsule, which has a shape corresponding to the aerodynamic shell, and attached to its inner side by means of an electric motor fastener made in the form of a set of supports with aerodynamic forms that are evenly distributed over the surface of the capsule , the ends of the aerodynamic shells of the first and second stages are connected to each other through a spacer that acts as an addition to compression and vnivatelya airflow impeller diameters of the first and second stages are made of the same size, and that the blades have a shape other than a teardrop shape, for example curved sectorally-orthogonal three-dimensionally.