JPH04134698U - centrifugal fan - Google Patents

Abstract

(57) [Summary] [Objective] The present invention relates to a centrifugal fan and aims to significantly suppress pressure fluctuations. [Structure] A boss part 11 fixed to a rotating shaft 12, a boss frame 13 whose center part is connected to the boss part 11 and rotates integrally with the boss part 11, and a boss frame 13 arranged in parallel at equal intervals on the circumference of the boss frame 13. It has a plurality of blades 14 provided, and each blade 13 is twisted in the rotation direction.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to centrifugal fans used, for example, in automotive air conditioning systems. It is.

0002

[Conventional technology]

Conventionally, this type of centrifugal fan has been disclosed, for example, in Japanese Utility Model Application Publication No. 52-132312. The method disclosed in Japanese Utility Model Application Publication No. 56-105699 is known. This will be explained based on FIG. 9. The centrifugal fan 1 has a boss fixed to the rotating shaft 3. 2, a boss frame 4 whose center portion is connected to the boss portion 2 and rotates integrally with the boss portion 2; A plurality of blades 5 are provided in parallel at equal intervals on the circumference of the boss frame 4, and It is composed of several blades 5 and a disk 6 connected to each other.

0003 This centrifugal fan 1 is used, for example, in an automobile air conditioning system as shown in FIG. It is installed in the air passage 7 of the disk 6, sucks air from the center side of the disk 6, and The air is discharged from the blade 5 side into the air passage 7.

0004

[Problem that the idea aims to solve]

However, in this conventional centrifugal fan 1, each blade 5 is located on the circumference of the boss frame 4. Since the blades 5 are provided in parallel at equal intervals, pressure fluctuations between each blade 5 and the space between them are minimized. After each blade passes through the throat part 8 of the wind passage 7, as shown in FIG. Pressure drops, so-called pressure fluctuations occur all at once, and the fluctuations are large, leading to increased pressure noise. That was one of the reasons.

[0005] This invention was devised to solve these conventional problems, and its purpose is to: An object of the present invention is to provide a centrifugal fan that can significantly suppress pressure fluctuations.

[0006]

[Means to solve the problem] The centrifugal fan according to the present invention has a boss fixed to a rotating shaft and a center connected to the boss. A boss frame that rotates together with the tie boss part, and a boss frame that rotates together with the boss part, and a It has a plurality of blades installed in parallel, and each blade is twisted in the direction of rotation. This is what is happening.

[0007] Each blade has an arc shape that protrudes in the axial direction of the boss. is desirable.

[0008]

[Effect]

In this invention, each blade during rotation is always positioned continuously in the rotation direction. The air can be pushed out by either blade, Pressure fluctuations can be leveled out.

[0009]

【Example】

Hereinafter, embodiments of the present invention will be described based on the drawings. 1 and 2 show a centrifugal fan according to an embodiment of the present invention. Reference numeral 11 denotes a boss portion, which is fixed to the rotating shaft 12. A motor 2 is attached to the rotating shaft 12. 0 are connected via a drive shaft 21. 13 is a boss frame, with the center part being a boss frame. It is connected to the boss part 11 and rotates together with the boss part 11. 14 is a plurality of blades , are provided in parallel on the circumference of the boss frame 13 at equal intervals. Then, each block The blade 14 is twisted at a predetermined angle α with respect to the axis S of the boss portion 11. It is something that

0010 Here, the predetermined angle α with respect to the axis S of the boss portion 11 is the angle α for a normal centrifugal fan. The angle is approximately equivalent to the angle between one pitch of each blade. In other words, each blur A contact portion from the disk 15 formed on the tip side of the card 14 to the boss frame 13 14A is set to be located at the adjacent contact portion 14B. Next, the centrifugal fan 10 according to the present embodiment configured in this manner is installed in the air passage shown in FIG. 30 and rotated by the motor 20, air is sucked as shown by the arrow. , are blown out in the rotational direction via each blade 14.

[0011] As shown in FIG. 3, two blades 14 are required in the throat portion 31. Before the pressure drop due to one blade 14 occurs, the pressure is applied to the next blade 14. As a result, the pressure drop inside the blade 14 can be suppressed. So As a result, the pressure fluctuations of each blade 14 are equalized, as shown by composite pressure A in FIG. be converted into In addition, in FIG. 5, a, b, and c indicate pressure fluctuations of each blade 14.

0012 As described above, according to the centrifugal fan 10 according to this embodiment, the a boss part 11 and a boss frame whose center part is connected to the boss part 11 and rotates together with the boss part 11; frame 13 and a plurality of parallel frames provided at equal intervals on the circumference of the boss frame 13. It has blades 14, and each blade 13 is twisted in the rotation direction. This makes it possible to significantly suppress pressure fluctuations, which significantly reduces pressure fluctuation noise. do. Also, as shown in Figure 1, there is a component of force in the direction of the suction axis (Z direction). , the airflow is directed in the Z direction, and the effect of preventing backflow from the disk 15 on the inlet side is exerted. Ru.

[0013] 6 and 7 show another embodiment of the present invention. Centrifugal fan 40 according to this embodiment Here, the plurality of blades 14 are twisted in the rotational direction. In this example, since the component force is in the opposite direction to the Z-axis, the airflow returns to the suction direction. However, it can have the effect of preventing airflow loss when it collides with a wall. FIG. 8 shows an example of a method for manufacturing the centrifugal fan in the above embodiment. First, injection A conventional centrifugal fan 50 is formed by molding, and then, while the resin is in a softened state, By twisting the disk 15 in the direction of the arrow, the centrifugal fan 10 of FIG. 1 is obtained. or , by twisting it in the opposite direction, the centrifugal fan 40 shown in FIG. 6 can be obtained. Furthermore, once formed Molding can also be done in the same way by heating a normal centrifugal fan 50 and softening the resin. be able to.

[0014] In the above embodiment, each blade 14 is formed substantially parallel to the axis S. However, it may also have a circular arc shape that projects with respect to the axis S. In this case, each brake The width of the door 14 in the depth direction increases, making it possible to further suppress pressure fluctuations.

[0015]

[Effect of the idea]

As explained above, the present invention has multiple blades twisted in the direction of rotation. This suppresses pressure fluctuations between each blade, significantly reducing pressure fluctuation noise. Each block Since a component force is generated in the direction of the depth of the radar, it is possible to smooth the suction of airflow. Becomes Noh. Furthermore, it is inexpensive because it can be manufactured by simply twisting a plurality of blades.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a centrifugal fan according to an embodiment of the present invention.

FIG. 2 is a longitudinal cross-sectional view of FIG. 1;

FIG. 3 is an explanatory diagram showing the relationship between the advancing state of the blade in FIG. 1 and the throat portion.

FIG. 4 is a graph showing pressure fluctuations when the centrifugal fan of FIG. 1 is used.

FIG. 5 is an explanatory diagram showing a state in which the centrifugal fan of FIG. 1 is attached to a wind passage.

FIG. 6 is a perspective view of a centrifugal fan according to another embodiment of the present invention.

FIG. 7 is an explanatory diagram showing the relationship between the advancing state of the blade in FIG. 6 and the throat portion.

FIG. 8 is an explanatory diagram showing the manufacturing process of the centrifugal fan according to the present invention.

FIG. 9 is a perspective view showing a conventional centrifugal fan.

FIG. 10 is an explanatory diagram showing a state in which the centrifugal fan of FIG. 9 is attached to a wind passage.

FIG. 11 is a graph showing pressure fluctuations when the centrifugal fan of FIG. 9 is used.

[Explanation of symbols]

11 Boss part 12 Rotation axis 13 Boss frame 14 Blade S axis line

Claims (2)

[Scope of utility model registration request] [Claim 1] A boss portion (1) fixed to a rotating shaft (12).
1), the center part is connected to the boss part (11), and the boss part (1
1), a boss frame (13) that rotates together with the boss frame (13), and a plurality of blades (14) provided in parallel at equal intervals on the circumference of the boss frame (13), each blade (14)
A centrifugal fan is characterized by being twisted in the direction of rotation. 2. In claim 1, each blade (14)
A centrifugal fan characterized in that the boss portion (11) has an arcuate shape protruding in the axis (S) direction.