JPH0653722U - Synthetic resin fan shroud - Google Patents

Abstract

(57) [Summary] [Purpose] In fan shrouds with fan motors,
(EN) A device that smoothly guides an air flow that has passed near the boss portion of a fan rearward by utilizing a part of a shroud. [Structure] A fan motor support portion of a shroud is formed in a truncated cone shape. The diameter of the tip of the outer peripheral surface of the motor support portion is made larger than the maximum diameter of the boss portion of the fan.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention mainly relates to a synthetic resin fan shroud with a fan motor, which is attached to the back of a vehicle heat exchanger.

[0002]

[Prior art]

 A conventional synthetic resin fan shroud with a fan motor has a shroud body that expands in a bell-mouth shape toward the front end, and a support for motor mounting is provided at the center of the rear end through a radial stay. It was Then, a motor was attached to this supporting portion, and the boss portion of the fan was fixed to the rotating shaft thereof. The front end of the fan shroud was attached to the back of the heat exchanger, and the fan motor was driven to allow the airflow to flow from the front to the rear of the heat exchanger core.

[0003]

[Problems to be solved by the device]

 Conventionally, the air flow passing through the radial tip of the fan blade is guided diagonally backward toward the outside in the radial direction by the wind force of the blade, but the air flow passing near the boss has vortices. It was not formed to smoothly guide the flow to the rear. Therefore, the present invention provides a fan shroud made of a synthetic resin having a simple structure that can smoothly guide the air flow passing near the boss portion of the fan rearward and obliquely by using a part of the fan shroud. In order to achieve that goal, the following structure is adopted.

[0004]

[Means for Solving the Problems]

 In the fan shroud of the present invention, the tip side of the shroud body 1 is expanded in a bell mouth shape, and the motor support portion 5 is provided on the shroud body 1 via a plurality of radial stay portions 4, and the motor support portion 5 is provided. A fan motor fitting portion 2 is formed on the inner circumference of the center of the. The boss portion 9 of the fan 8 is fixed to the rotary shaft 7 at the tip of the fan motor 6, and a plurality of blade portions 10 are radially provided on the outer circumference of the boss portion 9 to be projected. Further, the outer peripheral surface 3 of the motor supporting portion 5 at a position rearward of the boss portion 9 of the fan 8 and having a tip diameter which is equal to or larger than the maximum straight diameter of the outer periphery of the boss portion 9 is configured as an inner surface of the airflow plan diverging backward. It is characterized by

[0005]

[Action]

 In FIG. 1, the airflow that has passed near the boss portion 9 of the fan 8 is guided to the outer peripheral surface 3 of the motor support portion 5 that is a part of the fan shroud arranged behind it, and is guided obliquely rearward to smoothly. Circulate. As a result, the wind force of the fan is increased.

[0006]

【Example】

 Next, an embodiment of the synthetic resin fan shroud of the present invention will be described with reference to the drawings. 1 is a partially cutaway side view of the fan shroud of the present invention, and FIG. 2 is a rear view thereof. The fan shroud of this embodiment is made of a synthetic resin injection-molded body, and integrally connects the shroud body 1, the motor support portion 5 located at the center thereof, and the motor support portion 5 and the shroud body 1. It is an integrally molded product having a plurality of radial stay portions 4. The shroud body 1 has a shape in which the tip end side expands in a large bell mouth shape, and the rear end side expands in a small bell mouth shape. In this embodiment, four mounting portions 11 are radially provided on the outer periphery thereof, and two of the mounting portions 11 have bolt holes 15 formed at the tips thereof. Further, the other two mounting portions 11 are notched with hook-shaped bolt locking portions.

Next, the motor support portion 5 is located at the center of the shroud body 1 in the radial direction, and is located at a position rearward from the vicinity of the rear end edge of the shroud body 1. The fan motor fitting portion 2 is formed in a cylindrical shape and the outer circumference is formed in a truncated cone shape. An outer peripheral surface 3 of the motor support portion 5 and an outer periphery of the rear end portion of the shroud body 1 are integrally formed by a radial stair portion 4. The rear outer peripheral surface of the fan motor 6 is fitted to the fan motor fitting portion 2 of the fan shroud thus constructed, and the flange 17 projecting radially outward on the outer circumference of the fan motor 6 has the motor fixing bolts 12. It is fixed to the motor support portion 5 via. Then, the boss portion 9 of the fan 8 is fixed to the rotating shaft 7 of the fan motor 6. On the outer periphery of the boss portion 9, a plurality of blade portions 10 are integrally provided so as to project outward in the radial direction. Then, the fan shroud is fixed to the outer surface of the tank of the heat exchanger 16 and the like through the fan 8 protruding to the outer periphery of the shroud body 1 and the mounting portion 11.

However, when the fan 8 is rotated by driving the fan motor 6, a wind force is generated in the direction of the arrow in FIG. As a result, a negative pressure is generated on the back surface side of the heat exchanger 16, and the air flow flows from the front surface side to the rear surface side of the heat exchanger 16. In particular, the airflow that has passed near the boss portion 9 of the fan 8 is guided to the outer peripheral surface 3 of the motor support portion 5 and is smoothly guided obliquely rearward in the radial outward direction. As a result, the vortex flow generated behind the boss portion 9 is reduced as much as possible, and the wind force of the fan 8 is improved.

[0009]

[Effect of device]

 In the fan shroud made of synthetic resin of the present invention, the outer peripheral surface of the motor support portion, which is a part of the shroud, is formed on the airflow guide surface diverging rearward. The flow on the rear side of the fan motor can be smoothly guided to the rear side in the radial direction, and the wind force of the fan can be increased. That is, since the outer peripheral surface of the motor support portion is formed so as to diverge rearward, it is possible to smoothly guide the airflow included therein to the rearward divergence. In particular, the wind force generated by the fan has a velocity component outward in the radial direction and a velocity component rearward in the axial direction, and the combined velocity of both is directed diagonally backward, so the flow to the diagonal rearward Is promoted by the outer peripheral surface of the motor supporting portion, and as a result, air circulation can be improved and the electromotive force can be increased. Moreover, since the fan shroud of the present invention uses the motor supporting portion in the fan shroud, it has a simple structure and is easy to manufacture.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view of a fan shroud of the present invention.

FIG. 2 is a rear view of the same.

[Explanation of symbols]

 1 shroud body 2 fan motor fitting part 3 outer peripheral surface 4 stay part 5 motor support part 6 fan motor 7 rotating shaft 8 fan 9 boss part 10 blade part 11 mounting part 12 motor fixing bolt 13 end part 14 rib 15 bolt hole 16 heat Exchanger 17 Flange

Claims (1)

[Scope of utility model registration request] 1. A shroud body 1 that expands toward the tip side in a bell mouth shape, and a fan motor fitting portion 2 is formed on the inner circumference of the center, and the shroud body 1 is provided via a plurality of radial stay portions 4. Motor support portion 5 formed integrally with the
And a boss portion 9 of the fan 8 is fixed to the rotary shaft 7 at the tip of the fan motor 6, and a plurality of blade portions 10 are radially provided on the outer periphery of the boss portion 9 to project. An outer peripheral surface 3 of the motor support portion 5 is formed in an airflow guide surface diverging rearward at a position rearward of the boss portion 9 of the fan 8 and having a tip diameter larger than the maximum diameter of the outer periphery of the boss portion 9. A synthetic resin fan shroud that has been characterized.