CN107143526B - Centrifugal fan - Google Patents

Abstract

The application discloses a centrifugal fan, which comprises a shell, wherein a motor is arranged on the shell, an air inlet plate is arranged on the shell, and a noise reduction device is arranged at one end of the air inlet plate, which is not connected with the shell; the noise reduction device comprises a first arc plate and a second arc plate, wherein the first arc plate is parallel to the second arc plate, the two ends of the first arc plate are respectively connected with the two ends of the second arc plate through a first connecting sheet and a second connecting sheet, and the second connecting sheet is of an arc structure. According to the technical scheme that this application embodiment provided, through the installation of air intake position noise reduction device to noise reduction device constitutes through two circular arc boards and connection piece, simple structure and can effectively reduce fan noise.

Description

Centrifugal fan

Technical field

The present disclosure relates generally to the field of fans, and in particular to centrifugal fans.

Background technique

The centrifugal fan uses the mechanical energy of the rotation of the fan impeller to convert the pressure energy and kinetic energy of the gas, and transports the gas out. The gas enters axially along the streamlined air inlet of the fan, and the rotation of the impeller generates air energy, which moves the gas along the spiral shell. to the output, and then sent out from the air outlet of the casing.

The noise generated by centrifugal fans has an obvious impact on the surrounding environment and is related to people's normal life and health. People have increasingly higher requirements for noise control. Especially for some blowers, as shown in Figure 1, the fan outlet is connected to a pipe and the fan inlet is directly connected to the atmosphere, so the fan inlet noise has a greater impact.

Contents of the invention

In view of the above defects or deficiencies in the prior art, it is desired to provide a centrifugal fan.

On the one hand, a centrifugal fan is provided, including a casing, a motor is installed on the casing, an air inlet plate is installed on the casing, and an end of the air inlet plate that is not connected to the casing is provided with a dropper. noise device;

The noise reduction device includes a first arc plate and a second arc plate. The first arc plate and the second arc plate are arranged in parallel. The first arc plate and the second arc plate are arranged in parallel. The two ends of the plate are connected respectively through the first connecting piece and the second connecting piece, and the first arc plate is evenly provided with through holes.

According to the technical solution provided by the embodiment of the present application, a noise reduction device is installed at the air inlet, and the noise reduction device is composed of two arc plates and connecting pieces. The structure is simple and can effectively reduce fan noise.

Description of drawings

Other features, objects and advantages of the present application will become more apparent by reading the detailed description of the non-limiting embodiments with reference to the following drawings:

Figure 1 is a schematic structural diagram of a centrifugal fan in the prior art;

Figure 2 is a schematic structural diagram of the centrifugal fan in the present invention;

Figure 3 is a partial enlarged view of Figure 2.

Detailed ways

The present application will be further described in detail below in conjunction with the accompanying drawings and examples. It can be understood that the specific embodiments described here are only used to explain the relevant invention, but not to limit the invention. It should also be noted that, for convenience of description, only the parts related to the invention are shown in the drawings.

It should be noted that, as long as there is no conflict, the embodiments and features in the embodiments of this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and embodiments.

Please refer to Figure 2. The present invention provides a centrifugal fan, including a casing 1. A motor 2 is installed on the casing 1. An air inlet plate 3 is installed on the casing 1. The air inlet plate 3 is not connected to the casing 1. One end of the connection of the casing 1 is provided with a noise reduction device;

The noise reduction device includes a first arc plate 4 and a second arc plate 5. The first arc plate 4 and the second arc plate 5 are arranged parallel to each other. The two ends of the second arc plate are connected through the first connecting piece and the second connecting piece 6 respectively, and the first arc plate 4 is evenly provided with through holes.

In this embodiment, a noise reduction device is installed at the air inlet, and the noise reduction device is composed of two arc plates and connecting pieces. The structure is simple and can effectively reduce fan noise.

Furthermore, an impeller 8 is installed on the output shaft of the motor 2, and there is a gap between the impeller and the second connecting piece 6. In the present invention, there is a gap between the impeller and the second connecting piece for air flow when the fan is working, and the second connecting piece has an arc surface structure.

Further, the first arc plate is evenly provided with through holes, and the diameter of the through holes on the first arc plate is not greater than 1 mm.

A through hole with a diameter of less than or equal to 1 mm is opened on the first arc plate. The first arc plate is a micro through hole plate, forming a simple air inlet muffler, which effectively reduces fan noise.

Further, the thickness of the first arc plate is 1 mm. The thickness of the first arc plate is set appropriately to ensure the strength of the fan while saving material.

Further, the impeller includes a front cover plate and a rear cover plate, blades are installed between the front cover plate and the rear cover plate, and a gap is left between the front cover plate and the second connecting piece.

As shown in Figure 3, an enlarged view of the gap between the impeller and the second connecting piece. The gap is specifically between the impeller front cover and the second connecting piece.

Furthermore, a guide cone 7 is connected to the rear cover of the impeller, and the central axis of the guide cone coincides with the output shaft of the motor.

There is also a guide cone on the rear cover of the impeller. The central axis of the guide cone coincides with the motor output shaft, and the guide cone is set in a streamlined shape. This guide cone can reduce the fan inlet vortex and improve the internal flow characteristics of the impeller, effectively Improve fan efficiency.

Furthermore, the flow guide cone is evenly provided with through holes, and the diameter of the through holes on the flow guide cone is not greater than 1 mm.

Multiple through holes are provided on the guide cone, and the hole diameter is less than or equal to 1mm. The guide cone is also a micro-through hole structure, which can reduce the noise during use of the fan and improve the noise reduction effect.

Further, the guide cone is welded to the impeller rear cover plate.

Further, the air inlet plate is fixedly connected to the casing through bolts.

The centrifugal fan in the present invention uses a micro-perforated plate welded on the air inlet and a micro-perforated guide cone welded on the impeller to form a simple inlet muffler, which can effectively reduce fan noise. The streamlined inlet guide cone can reduce The fan inlet vortex improves the internal flow characteristics of the impeller and improves the fan efficiency.

The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by a specific combination of the above technical features, but should also cover any combination of the above technical features without departing from the concept of the invention. or other technical solutions formed by any combination of equivalent features. For example, a technical solution is formed by replacing the above features with technical features with similar functions disclosed in this application (but not limited to).

Claims (1)

1. The centrifugal fan comprises a shell, wherein a motor is arranged on the shell, and the centrifugal fan is characterized in that an air inlet plate is arranged on the shell, a noise reduction device is arranged at one end, which is not connected with the shell, of the air inlet plate, and the air inlet plate is fixedly connected to the shell through bolts;

the noise reduction device comprises a first arc plate and a second arc plate, wherein the first arc plate and the second arc plate are arranged in parallel, two ends of the first arc plate and two ends of the second arc plate are respectively connected through a first connecting sheet and a second connecting sheet, through holes are uniformly formed in the first arc plate, the aperture of each through hole in the first arc plate is not more than lmm, and the thickness of the first arc plate is lmm;

the motor output shaft is provided with an impeller, a gap is reserved between the impeller and the second connecting sheet, the impeller back cover plate is also connected with a diversion cone, the central shaft of the diversion cone coincides with the motor output shaft, the diversion cone is streamline, the diversion cone is evenly provided with through holes, the aperture of the through hole on the diversion cone is not more than lmm, the diversion cone is welded on the impeller back cover plate,

the impeller comprises a front cover plate and a rear cover plate, blades are arranged between the front cover plate and the rear cover plate, and a gap is reserved between the front cover plate and the second connecting sheet.