JPS6329197Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an improvement in a fan device suitable for use as a fan for guiding hot air into a rotating drum, for example, in a clothes dryer used in a general household.

Conventional structure and its problems Conventionally, in the blower fan structure used in this type of clothes dryer, the shaft is fixed to the fan and the shaft is attached to the fan using a separate metal unit member as a means for rotationally driving the fan belt. The system adopts a method of supporting the engine and equipping it with a separate fan pulley.
The increase in the number of parts increases the number of fixing steps and costs, making it uneconomical. As another method, there is a system in which the fan and the fan pulley are integrally formed for the purpose of rationalization, but there are various problems. For example, in the conventional configuration shown in FIG. 1, two sintered metal metals 2 are press-fitted into the bearing part of the fan 1 from both sides, an oil-impregnated felt 3 is installed in the center, and the fan belt groove shape is formed through the fan belt. In order to prevent wear of the part 4, the entire fan must be made of expensive wear-resistant resin, resulting in a very high overall cost. In FIG. 2, a fan belt groove shape and a bearing portion are integrally formed on a fan pulley 5, and this is insert molded into a fan 6. A plurality of grease reservoirs 7 are provided in the bearing portion of the fan pulley 5 in the axial direction, and a grease cap is provided at the end of the grease reservoir 7. However, there are sink marks on the bearing surface and instability of the center circularity, and even if reaming is added in the later process, it is extremely unstable, and periodic abnormal noises occur due to sliding when the fan rotates. However, there were also problems in terms of quality assurance, such as large variations, high management costs, and poor productivity.

Purpose of the invention The present invention solves these conventional problems and provides a fan structure that improves productivity through cost reduction and stabilizes quality.

Structure of the invention In order to achieve the above object, the invention provides a fan pulley made of a wear-resistant resin material that integrally has a groove part for tensioning the fan belt and a bearing part, and the bearing part of this fan pulley. A cylindrical portion larger than the inner diameter of the bearing portion is provided at the end, and a cylindrical second bearing portion made of the same material as the fan pulley is press-fitted into this cylindrical portion, and a cylindrical portion is provided on the center side of the cylindrical portion. A fan pulley unit including a grease reservoir and the fan pulley and a second bearing is insert-molded into the fan body.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. In FIG. 3, 9 is the main body of the dryer, and 10 is a rotary drum provided in the main body 9 for accommodating the material to be dried, which is rotatably supported. Reference numeral 11 denotes a heating element provided at the lower front surface of the drum 10, and a blower fan 12 guides hot air from the heating element 11 into the rotating drum. The hot air used to dry the clothes turns into moist air and is exhausted to the outside of the machine through the air duct 13.

A drive motor 14 rotates the rotating drum 9 and the blower fan 12 via a drum belt 15 and a fan belt 16, respectively.

The blowing fan 12 is a fan shaft 1 fixed to a drum holder 17 fixed to the main body 9.
8 as a fixed axis. A filter 19 for collecting lint from clothing is attached to the center of the rear surface of the rotating drum 10. Reference numeral 20 denotes a door that can be opened and closed when loading and unloading clothes, and covers the clothes slot.

In the above configuration, the drying operation will be described. Outside air is taken in from the louver 21 provided on the main body 9, the air passes through the heating element 11, and is sent into the rotating drum 10 as hot air. The hot air that has passed through the object to be dried turns into wet air, which is guided through a filter 19 to a blower fan 12 and a blower duct 13, and then discharged outside the machine, thereby drying the object.

Next, the specific structure of the blower fan 12 will be described with reference to Fig. 4. The fan pulley 22 has a groove 22a that matches the shape of the belt that suspends the fan belt 16, and is made of highly wear-resistant polyacetal resin or the like with which the bearing portion 22b is molded integrally. Reference numeral 23 denotes a cylindrical second bearing portion that is made of the same resin material as the fan pulley 22 and is separate from the fan pulley 22. A cylindrical portion 22c with a diameter larger than the inner diameter of the bearing portion 22b is formed at the end of the fan pulley 22 opposite the bearing portion 22b where the groove 22a is present, and this cylindrical portion 22c
The second bearing portion 23 is press-fitted and fixed to the inside of the
A grease reservoir 2 is provided on the bearing 22b side of the cylindrical portion 22c.
The combination of the fan pulley 22 and the second bearing portion 23 constitutes a fan pulley unit, which is formed integrally as a fan unit by insert molding into a fan body 25 made of polypropylene or the like.

The second bearing part 23 and the fan pulley 22 are made of the same resin such as polyacetal resin, and the second
By press-fitting the bearing part 23 into the fan pulley and providing the grease reservoir part 24 in the center, the weight of expensive polyacetal resin etc. can be reduced, and the bearing performance can be improved by improving wear resistance. Stabilization can be achieved. Further, since the bearing portion 22b has no slit groove in the axial direction, no abnormal noise is generated during rotation and sliding, and very good rotation can be obtained. Furthermore, a groove part for suspending the fan belt,
Since this groove is integrally formed with the bearing that supports the rotational axis, eccentricity between the groove and the bearing can be minimized, and abnormal noise caused by vibration of the fan belt can be prevented. .

Effects of the Invention As is clear from the above embodiments, the fan device of the present invention has a second bearing made of the same resin material as the fan pulley, which is press-fitted into the end of the fan pulley, and a tube of the fan pulley. A fan pulley unit is constructed by providing a grease reservoir on the bearing side of the fan, and this fan pulley unit is insert molded into the fan body, resulting in a significant cost reduction by reducing the number of parts and surrounding materials. In this case, it is possible to economically set the ratio of resin materials that have particularly good bearing performance and wear resistance, thereby reducing costs and improving productivity. Furthermore, since the bearing portion does not require a slit groove in the axial direction, periodic abnormal noises during rotation and sliding can be prevented from occurring, and quality can be stabilized.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view showing a conventional fan structure, Fig. 2 is a longitudinal sectional view showing the conventional fan structure, Fig. 2a is a longitudinal sectional view, Fig. 2b is a sectional view taken along line A-A' in Fig. 3 is a longitudinal sectional view of a clothes dryer showing an embodiment of the present invention, FIG. 4 shows its fan structure, FIG. FIG. 12...Blower fan, 22...Fan pulley, 22a...V groove part, 22b...Bearing part, 23
...Metal, 24...Grease reservoir.

Claims (1)

[Scope of utility model registration request] A fan pulley made of a wear-resistant resin material is provided which integrally has a groove part for stretching the fan belt and a bearing part, and a cylindrical part with a diameter larger than the inner diameter of the bearing part is provided at the end of the bearing part of this fan pulley. established,
A second cylindrical bearing made of the same material as the fan pulley is press-fitted into the cylindrical portion, and a grease reservoir is formed on the bearing side of the cylindrical portion,
A fan device in which a fan pulley unit including the fan pulley and a second bearing portion is insert-molded in a fan main body.