CN202117979U - Centrifugal impeller - Google Patents

Abstract

The utility model discloses a centrifugal impeller, which belongs to the technical field of centrifugal fan impellers. The centrifugal impeller includes the impeller body and the impeller shaft. The hub is fixed on the rear disk, and the two sides of the blades are respectively fixed on the front disk and the rear disk. The diameter of the impeller outlet is 80 cm. The space is evenly distributed along the circumferential direction and forms the impeller wheel body with the front disc, rear disc and hub. The width of the impeller outlet is 20.8-21.2 cm, and the installation angle of the blade outlet is 43.5-44.5 degrees. The utility model improves the internal flow field of the impeller by optimizing key structural parameters such as the number of blades, the width of the impeller outlet and the installation angle of the blade outlet, the wake area in the impeller flow channel is reduced, and the shear layer between the jet and the wake is enlarged. , the entropy production area and strength in the impeller are reduced; the efficiency and load of the centrifugal impeller are improved, and its application range is broadened; the problem of insufficient fan flow or total pressure due to the increase in pipeline resistance is solved; it is suitable for centrifugal fans.

Description

a centrifugal impeller

technical field

The utility model belongs to the technical field of centrifugal fan impellers, in particular to a centrifugal impeller.

Background technique

In the field of centrifugal impellers for conveying fluids, the function of the centrifugal impeller is to convert the mechanical energy of the motor into the pressure potential energy and kinetic energy of the air. As an important equipment of the ventilation system, it has been widely used in the industrial field. Many fan impellers can meet the needs at the beginning of operation. However, after a period of operation, due to the increase of pipeline resistance and other reasons, the flow or total pressure of the fan will be insufficient, which will affect the load and efficiency of the fan, and then affect its scope of use. Therefore, it is necessary to design a new type of impeller to solve the problem of insufficient flow or total pressure of the fan due to the increase of pipeline resistance after the fan has been running for a period of time; After installing the new impeller, while the resistance performance curve of the pipeline remains unchanged, the flow rate of the fan is increased, the total pressure is greatly improved, and the efficiency is slightly increased.

Utility model content

The purpose of this utility model is to solve the problem of increasing the flow rate of the fan, greatly increasing the total pressure, and slightly increasing the efficiency while the resistance performance curve of the pipeline is unchanged after the new impeller is installed in the background technology, and provides a centrifugal impeller. The impeller is characterized in that the centrifugal impeller includes an impeller wheel body and an impeller shaft 5, the impeller wheel body is composed of a hub 4, a front disc 1, a rear disc 3 and blades 2, the hub 4 is fixedly connected to the rear disc 3, and the two sides of the blade 2 They are fixedly connected to the front disk 1 and the rear disk 3 respectively, the diameter of the impeller outlet is 80 cm, 12 to 14 blades 2 are evenly distributed along the circumferential direction between the front disk 1 and the rear disk 3, and the width of the impeller outlet is 20.8 to 21.2 cm. The installation angle of the blade outlet is 43.5-44.5 degrees, and the impeller shaft 5 and the hub hole of the hub 4 form a detachable connection between the impeller body and the impeller shaft 5 through keys and key grooves.

The blade 2 is an airfoil or a single plate.

The three key structural parameters of the utility model, the number of blades, the width of the impeller outlet and the installation angle of the blade outlet, are the key technology of the utility model to meet the optimal combination and distribution of the fan load and efficiency.

The beneficial effect of the utility model is that due to the optimization of key structural parameters such as the number of blades, the width of the impeller outlet, and the installation angle of the blade outlet, the internal flow field of the impeller is improved, the wake area in the impeller channel is reduced, and the jet-wake relationship is improved. The shear layer between the impellers is expanded, and the entropy production area and strength in the impeller are reduced; the efficiency and load of the centrifugal impeller are improved, and its application range is broadened; under the same design conditions, the total pressure of the fan can be increased by 5% to 7%, and the efficiency can be increased. Increase by 0.5 to 1%, widen the high-efficiency zone, and increase the flow rate at the highest efficiency point of the fan. The utility model effectively solves the problem of insufficient flow rate or total pressure of the fan due to the increase of pipeline resistance. Only the impeller of the fan needs to be replaced, and the volute and the current collector do not need to be modified. The utility model has practicability and is suitable for centrifugal fans.

Description of drawings

Fig. 1 is the structural representation of the utility model centrifugal impeller embodiment;

Fig. 2 is a top structural schematic diagram of an embodiment of the centrifugal impeller of the present invention.

Among the figure, 1--front disk, 2--blade, 3--back disk, 4--wheel hub, 5--impeller shaft.

Detailed ways

Below in conjunction with accompanying drawing and concrete example, the utility model is further described:

Fig. 1 and Fig. 2 are respectively the front view structural schematic diagram and the top view structural schematic diagram of the embodiment of the centrifugal impeller of the present invention. A centrifugal impeller with an impeller outlet diameter of 80 cm includes an impeller body and an impeller shaft 5. The impeller body is composed of a hub 4, a front disc 1, a rear disc 3 and blades 2. The hub 4 is fixedly connected to the rear disc 3, and the blades 2 are two 12 to 14 blades 2 are evenly distributed along the circumferential direction between the front disk 1 and the rear disk 3, and the impeller shaft 5 and the hub hole of the hub 4 pass through keys and keyways The detachable connection between the impeller wheel body and the impeller shaft 5 is formed. The diameter of the impeller inlet in this embodiment is 58.2 centimeters, the blade 2 is an airfoil, and the optimal combination of the three key structural parameters of the number of blades, the width of the impeller outlet and the installation angle of the blade outlet is that the width of the impeller outlet is 21 centimeters, and the installation angle of the blade outlet is 21 centimeters. It is 43.9 degrees, and the number of leaves is 14 pieces.

After this embodiment is used in a fan, the total pressure is increased by 6.8%, the efficiency is increased by 0.5%, the flow rate at the highest efficiency point is increased, and the high-efficiency area is widened. The impeller is suitable for fans in power stations and other fields. It solves the problem of full pressure or insufficient load caused by increased pipeline resistance, and at the same time can improve fan efficiency, effectively save energy, and meet fan load and efficiency.

Claims (2)

1. A centrifugal impeller is characterized in that the centrifugal impeller comprises an impeller wheel body and an impeller shaft (5), and the impeller wheel body is made up of a hub (4), a front disc (1), a rear disc (3) and a blade (2) , the hub (4) is affixed to the rear disk (3), the two sides of the blades (2) are respectively affixed to the front disk (1) and the rear disk (3), the diameter of the impeller outlet is 80 cm, and 12 to 14 blades ( 2) Evenly distributed in the circumferential direction between the front disc (1) and the rear disc (3), the width of the impeller outlet is 20.8-21.2 cm, the installation angle of the blade outlet is 43.5-44.5 degrees, the impeller shaft (5) and the hub (4 ) constitutes the detachable connection between the impeller wheel body and the impeller shaft (5) through keys and keyways. 2. A centrifugal impeller according to claim 1, characterized in that the blade (2) is an airfoil or a single plate.

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