JPH04116700U - Air conditioner blower - Google Patents

Abstract

(57) [Summary] [Purpose] To suppress air flow turbulence and vortices at the suction side end of the bell mouth to reduce noise during operation of the blower. [Configuration] Bell mouth 1 surrounding propeller fan 16
A urethane ring 2 having a porous surface and a circular cross section is fitted and adhered to the outer periphery of the suction side end 1a.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is an air conditioner blower device that uses a propeller fan with a bell mouth. Regarding.

0002

[Conventional technology]

Conventionally, as a blower device for this type of air conditioner, for example, the one shown in Fig. 3 has been used. It is known (Japanese Unexamined Patent Publication No. 63-243495). This blower is a bell mouth A propeller fan 16 driven by a motor 15 is provided at the center of the An opening with a smaller diameter than the outer diameter of the propeller fan 16 is formed on the outer periphery of the outlet end of the mouth 14. A partition plate 17 is provided. After passing through the filter 12 and heat exchanger 13, the When the propeller fan 16 blows out the outside air sucked into the space 11, the outer periphery of the fan The partition plate 17 prevents the backflow of air due to the low pressure of the air, reducing turbulent noise caused by the backflow. We are trying to eliminate the occurrence.

0003

[Problem that the idea aims to solve]

However, the conventional blower device has an edge 14a at the suction side end of the bell mouth 14. Because the area is exposed, the separation of the suction airflow as shown in Figure 3 occurs in this area. It is said that turbulence and vortices will occur, generating noise that exceeds the noise reduced by the partition plate 17. There are some drawbacks. Therefore, the purpose of this invention is to suppress the turbulence and vortices of the airflow at the suction side end of the bell mouth. We provide air conditioner blowers that can reduce noise during operation by controlling There are many things.

0004

[Means to solve the problem]

In order to achieve the above object, the air conditioner blower device of the present invention is illustrated in FIG. As shown in FIG. On the outer periphery of the suction side end 1a of the bell mouth 1, there is an annular ring having a porous surface and a substantially circular cross section. It is characterized by having a portion 2. Note that the annular portion 2 is separate from the bell mouth 1, and the annular portion 2 is separate from the bell mouth 1. It may be a circular ring 2 fixed to the outer periphery of the suction side end 1a.

[0005]

[Effect]

The air sucked in by the propeller fan 16 is at the suction side end 1 of the bell mouth 1 Most of the turbulence and vortices are prevented along the annular portion 2 with a substantially circular cross section provided on the outer periphery of a. It flows smoothly without any distortion, reducing noise caused by turbulence and vortices. Also, the ring Since the shaped portion 2 has a porous surface, it absorbs the generated noise. Therefore, the blower Noise during operation is significantly suppressed. Note that the annular portion 2 is fixed to the outer periphery of the suction side end 1a of the bell mouth 1. If you make the body ring 2, it will be easier to manufacture compared to the case where it is integrally processed into the bell mouth. .

[0006]

【Example】

Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments. FIG. 1 is a sectional view showing an example of a bell mouth of an air conditioner blower according to the present invention. The parts not shown have the same configuration as the conventional air conditioner described in FIG. On the outer periphery of the suction side end 1a of the bell mouth 1 surrounding the propeller fan 16, A ring 2 molded from urethane resin as an annular portion is fitted and bonded. circle The ring 2 has a porous surface and a diameter D equal to the width of the parallel portion 1b of the bell mouth 1. It has a circular cross section with a smaller diameter than W.

[0007] The bell mouth section having the above structure operates as follows. The air sucked in by the propeller fan 16 is as shown by the arrow in FIG. , a ring 2 made of urethane resin that is fitted and adhered to the outer periphery of the suction side end 1a of the bell mouth 1 , it flows smoothly with almost no turbulence or vortices, so it is free from turbulence or vortices. Noise is reduced. In addition, since the surface of ring 2 is made of porous urethane resin, Absorbs more noise. Therefore, the noise during operation of the propeller fan 16 is significantly suppressed. controlled and reduced. In the above embodiment, the annular portion of the suction side end 1a of the bell mouth 1 is Since the ring 2, which is a separate piece, is fitted and glued onto the ring 16 without being integrally processed, the annular part cannot be processed. This has the advantage that the manufacturing of the blower device becomes easier.

[0008] Figure 2 shows the noise level and blowing wind when the above example is operated in an anechoic chamber. Compare the measurement results of the quantities with similar measurement results without the torus 2 and see the solid line and and are indicated by dashed lines, respectively. As is clear from the figure, the example (solid line) has a noise level under normal operating conditions (medium air volume). It can be seen that the signal is approximately 0.5 dB lower than that of the conventional example (dashed line). On the other hand, it is necessary to obtain the same air volume. The required rotation speed of the propeller fan 16 is slightly higher by 2 r.p.m. in the example (solid line). However, no significant difference was observed. In other words, while maintaining the same blowing capacity, the noise is reduced by 0.5d. It can be seen that it can be reduced by about B.

[0009] In the above embodiment, the annular portion at the suction side end of the bell mouth 1 is made of urethane resin. The circular ring 2 was formed using a pipe or round bar with a porous surface made of other materials. It may be processed into an annular shape and joined to the outer periphery of the suction side end. It may be integrally formed with a substantially circular cross section.

0010

[Effect of the idea]

As is clear from the above explanation, the air conditioner blower device of the present invention has a propeller shaft. The outer periphery of the suction end of the bell mouth that surrounds the fan has a porous surface and a roughly circular cross section. Since the annular part is provided, the airflow sucked by the propeller fan flows through the annular part. It flows smoothly along the section, significantly reducing noise during operation due to turbulence and vortices.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an example of a bell mouth of an air blower for an air conditioner according to the present invention.

FIG. 2 is a diagram showing the measurement results of the noise level and the amount of air blown for the above-mentioned bell mouth and a conventional bell mouth.

FIG. 3 is a sectional view of a conventional air blower device of an air conditioner.

[Explanation of symbols]

1...bell mouth, 1a...suction side end, 2...ring, 11...case, 13...heat exchanger, 16...propeller fan.

Claims (2)

[Scope of utility model registration request] [Claim 1] Propeller fan having a bell mouth (1)
In the blower device for an air conditioner using (16), an annular portion (2) having a porous surface and a substantially circular cross section is provided on the outer periphery of the suction side end (1a) of the bell mouth (1). An air conditioner blower device featuring: 2. A claim in which the annular portion (2) is a ring (2) that is separate from the bell mouth and is fixed to the outer periphery of the suction side end (1a) of the bell mouth (1). 1. Air conditioner blower.