WO2020050059A1

WO2020050059A1 - Blower

Info

Publication number: WO2020050059A1
Application number: PCT/JP2019/033001
Authority: WO
Inventors: 理天福島
Original assignee: 株式会社デンソー
Priority date: 2018-09-05
Filing date: 2019-08-23
Publication date: 2020-03-12
Also published as: JP2020037926A

Abstract

A blower (7) is provided with a fan (70) and a shroud (73). The fan has a plurality of blades (700), and an annular fan ring coupling distal end sections of each of the plurality of blades. The shroud (73) has a cylindrical part (730), a guide part (731), and a projecting part (732). The guide part of the shroud has a longitudinal section (734) where the distance from an outer margin to the fan ring is set to a predetermined distance, and a transverse section (735) where the distance from the outer margin to the fan ring is shorter than the predetermined distance. The projecting part is formed so that the length of a second site is greater than the length of a first site, where the first site is a site provided to a location corresponding to the longitudinal part in the projecting part, and the second site is a site provided to a location corresponding to the transverse part in the projecting part.

Description

Blower

Cross-reference of related applications

This application is based on Japanese Patent Application No. 2018-166197 filed on Sep. 5, 2018, and claims the benefit of its priority. Incorporated herein by reference.

The present disclosure relates to a blower.

熱 In the engine room of the vehicle, there are provided a heat exchanger such as a condenser or a radiator for exchanging heat with the air introduced from the grill opening, and a blower for blowing air to the heat exchanger. Such a blower includes a fan that generates an airflow by rotating, a motor for rotating the fan, and a shroud provided to cover the outer periphery of the fan. The fan includes a plurality of blades arranged radially, and an annular fan ring connecting the tips of the blades. The shroud has a cylindrical portion provided to cover the outer periphery of the fan, and a guide portion provided at one end of the cylindrical portion on the upstream side in the air flow direction. The guide part is a part that guides the air flow generated by the fan. A gap is formed between the fan ring and the inner peripheral surface of the shroud. Thus, the fan ring and the shroud do not interfere with each other.

In such a blower, when the fan rotates, the air having a flow direction opposite to the flow direction of the main flow of air generated by the rotation of the fan is provided in a gap formed between the fan ring and the shroud. Flow occurs. When the airflow in the opposite direction collides with the main airflow generated by the rotation of the fan, the airflow is disturbed. When the air flow is disturbed in this manner, noise may be generated from the blower.

Therefore, in the blower described in Patent Literature 1 below, an annular protrusion is provided on the inner wall surface of one end of the cylindrical portion of the shroud on the upstream side in the air flow direction so as to protrude inward. The protrusion blocks the airflow in the opposite direction, thereby suppressing the generation of noise.

U.S. Pat. No. 9,334,877

In recent years, in hybrid vehicles and turbo engine vehicles, the number of accessory parts has increased compared to conventional vehicles using only engines. On the other hand, the space in the vehicle compartment tends to be maintained or expanded in order to improve comfort. Further, in order to ensure collision safety, an extra space is provided in front of the vehicle. Due to these combined factors, the mounting space for parts in the engine room is shrinking, and mounting parts in the engine room has become extremely difficult. For this reason, with respect to the blower mounted in the engine room, restrictions on the shape of the shroud are becoming severer, such as reducing the thickness and increasing the aspect ratio. In order to satisfy such a demand, in recent years, a flat shroud having a large aspect ratio and a thin shape is sometimes used as the shroud of the blower.

By the way, when a flat shroud is used, the length of the guide portion is not uniform. Specifically, while the length of the guide portion is longer in the longitudinal direction of the shroud, the length of the guide portion is shorter in the shorter direction. In a portion where the length of the guide portion is long, it is possible to form an airflow that flows smoothly along the protrusion by flowing air along the guide portion. However, in a portion where the length of the guide portion is short, it is difficult to form an airflow that flows smoothly along the protrusion. In such a portion, the protruding portion becomes an obstacle to the main flow of air, so that an air flow flowing in a direction opposite to the main flow of air is formed along the protruding portion, and air stagnation may occur. Confirmed by the inventor. Such stagnation of air causes inflow loss, and as a result, there is a possibility that the air volume of the blower may be adversely affected.

目的 An object of the present disclosure is to provide a blower capable of improving an air inflow loss.

送 A blower according to an aspect of the present disclosure includes a fan and a shroud. The fan has a plurality of blades provided radially around a predetermined axis, and an annular fan ring connecting respective tips of the plurality of blades, and rotates the air around the axis to generate an air flow. Generate. The shroud has a predetermined gap between the fan ring and a cylindrical portion disposed so as to cover the outer periphery of the fan, and extends from the outer periphery of one end of the cylindrical portion radially outward around the axis. It has a guide portion formed to guide the air flow generated by the rotation of the fan, and an annular protrusion formed to protrude from the inner peripheral surface of one end of the cylindrical portion. The guide portion has a longitudinal portion in which a distance from the radially outer edge around the axis to the fan ring is set to a predetermined distance, and a distance from the radially outer edge to the fan ring around the axis in the predetermined distance. And a shorter part than the short part. When a portion provided at a position corresponding to the long portion in the protruding portion is a first portion, and a portion provided at a position corresponding to the short portion in the protruding portion is a second portion, the protruding portion is in a flow direction of the air flow. Is formed such that the length of the second portion along the flow direction of the airflow is longer than the length of the first portion along.

According to this configuration, the second portion of the protrusion provided at the position corresponding to the short portion of the guide portion is longer than the first portion of the protrusion provided at the position corresponding to the long portion of the guide portion. At the second portion of the protrusion, an airflow that flows along the protrusion is easily generated. This makes it difficult for the protruding portion to become an obstacle to the main flow of air generated by the fan 70, so that it is difficult to generate an airflow flowing in a direction opposite to the flow direction of the main flow of air. As a result, the retention of air is less likely to occur, so that the inflow loss can be improved.

FIG. 1 is a diagram schematically illustrating a schematic configuration of a vehicle. FIG. 2 is a front view illustrating a front structure of the blower according to the embodiment. FIG. 3 is a front view illustrating a front structure of the fan according to the embodiment. FIG. 4 is a perspective view showing one perspective structure when the shroud of the embodiment is divided into two parts. FIG. 5 is a front view schematically illustrating a schematic configuration of the blower according to the embodiment. FIG. 6 is a cross-sectional view showing a cross-sectional structure taken along the line VI-VI of FIG. 5 and a flow of air around the cross-sectional structure. FIG. 7 is a cross-sectional view showing the cross-sectional structure around the short portion of the shroud of the reference example and the flow of air around it. FIG. 8 is a diagram schematically showing a cross-sectional structure along the line VIII-VIII in FIG. FIG. 9 is a graph showing the relationship between the rotational position θ shown in FIG. 5 and the length L of the protruding portion of the shroud.

Hereinafter, an embodiment of a blower will be described with reference to the drawings. To facilitate understanding of the description, the same components are denoted by the same reference numerals as much as possible in each drawing, and redundant description will be omitted.
First, a schematic configuration of a vehicle on which the blower of the present embodiment is mounted will be described.

グリル A grill opening 2 is provided in front of the body 1 of the vehicle C shown in FIG. Grill opening 2 is a portion for introducing air in front of vehicle body 1 into engine room 3. The air introduced into the engine room 3 from the grill opening 2 flows in the direction indicated by the arrow Y in the drawing. In the engine room 3, in addition to the engine 4, a condenser 5, a radiator 6, and a blower 7 are arranged. The condenser 5, the radiator 6, and the blower 7 are arranged in this order in the direction from the grill opening 2 to the engine 4.

The condenser 5 is one element constituting a refrigeration cycle of an air conditioner mounted on the vehicle C, and performs heat exchange between a refrigerant circulating in the refrigeration cycle and air introduced from the grill opening 2. Dissipates the refrigerant. The radiator 6 radiates cooling water by exchanging heat between cooling water for cooling the engine 4 and air introduced from the grill opening 2. The blower 7 blows air introduced from the grill opening 2 to the condenser 5 and the radiator 6.

Next, a specific structure of the blower 7 will be described.
As shown in FIG. 2, the blower 7 includes a fan 70, a motor 71, a stay 72, and a shroud 73.
In the following, the three axis directions orthogonal to each other are represented by a direction indicated by an arrow X, a direction indicated by an arrow Y, and a direction indicated by an arrow Z, respectively. In the present embodiment, the direction indicated by the arrow Y is the flow direction of the airflow introduced from the grill opening 2 as described above. The direction indicated by arrow Z is the vertical direction. The direction indicated by arrow X is a direction orthogonal to both the direction indicated by arrow Y and the direction indicated by arrow Z.

ファン As shown in FIG. 3, the fan 70 is an axial-flow fan that rotates around the axis m1. The fan 70 has a plurality of blades 700 and a fan ring 701. The plurality of blades 700 are provided to extend radially from the center of the fan 70. The fan ring 701 is formed of an annular member that connects the tips of the blades 700 to each other.

モータ As shown in FIG. 2, a motor 71 is attached to the center of the fan 70. The motor 71 rotates the fan 70 about the axis m1 by applying torque to the fan 70 based on the supply of electric power. The blower 7 is a so-called suction type blower that forms an airflow in a direction indicated by an arrow Y, that is, an airflow in a direction from the condenser 5 and the radiator 6 to the blower 7 by the rotation of the fan 70.

複数 A plurality of stays 72 extending radially around the axis m1 are mounted on the outer peripheral portion of the motor 71. The stay 72 is disposed upstream of the fan 70 in the airflow direction Y. The tip of each stay 72 is fixed to a shroud 73. Each stay 72 supports a fan 70 and a motor 71.

The shroud 73 is arranged on the outer periphery of the fan 70. The shroud 73 is formed of a resin material or the like. As shown in FIG. 4, the shroud 73 has a cylindrical portion 730, a guide portion 731 and a projecting portion 732.
The cylindrical portion 730 is formed in a cylindrical shape around the axis m1. The cylindrical portion 730 is disposed so as to cover the periphery of the fan 70 with a predetermined gap between the cylindrical portion 730 and the fan ring 701.

The guide portion 731 is formed to extend radially outward from the outer circumference of one end of the cylindrical portion 730 on the upstream side in the air flow direction Y, with the axis m1 as the center. The guide portion 731 has a function of guiding an air flow generated by the rotation of the fan 70. As shown in FIG. 2, the guide portion 731 is formed so that the cross-sectional shape orthogonal to the flow direction Y of the air flow is rectangular and the thickness in the flow direction Y of the air flow is thin. That is, the shroud 73 is formed in a flat shape. As shown in FIG. 4, a bent portion 733 is formed on the outer edge 731a of the guide portion 731 so as to be bent toward the upstream side in the flow direction Y of the air flow. The shroud 73 is fixed to the radiator 6 by attaching the distal end of the bent portion 733 to the radiator 6 shown in FIG.

In the blower 7, when the fan 70 rotates, an airflow having a flow direction opposite to the direction indicated by the arrow Y is formed in a gap formed between the fan ring 701 and the cylindrical portion 730. You. In order to cut off the airflow in the opposite direction, as shown in FIG. 4, the inner peripheral surface at one end of the cylindrical portion 730 on the upstream side in the airflow direction Y may protrude inward. A protruding portion 732 is formed at the bottom. The protruding portion 732 is formed in an annular shape along the inner peripheral surface of one end of the cylindrical portion 730.

In the following, an airflow generated in the direction indicated by arrow Y generated by the rotation of fan 70 and an airflow in the opposite direction formed in the gap between fan ring 701 and cylindrical portion 730 are distinguished. For this reason, the former airflow is referred to as the main airflow.
By the way, when the shroud 73 is formed in a flat shape, as shown in FIG. 5, the guide portion 731 has a longitudinal portion in which the distance from the outer edge 731a to the fan ring 701 is set to the first predetermined distance L11. 734 and a short portion 735 in which the distance from the outer edge 731a to the fan ring 701 is set to a second predetermined distance L12 shorter than the first predetermined distance L11. In FIG. 5, only the fan 70 and the shride 73 are schematically illustrated, and the protrusion 732 of the shroud 73 is not illustrated. In the shroud 73 having such a structure, the length of the guide portion 731 in the short portion 735 cannot be sufficiently ensured. Therefore, in this portion, the protrusion 732 acts as an obstacle to the main flow of air flowing in the direction indicated by the arrow Y, so that an airflow flowing in the opposite direction to the main flow of air is formed along the protrusion 732. Has been confirmed by the inventor.

Specifically, as shown in FIG. 6, in the long portion 734, the length of the guide portion 731 is sufficiently ensured, so that the main flow of the air flows along the long portion 734 as indicated by the arrow A <b> 1. Flows smoothly. Since the main flow of the air flowing along the longitudinal portion 734 flows along the protrusion 732 as it is, the protrusion 732 hardly becomes an obstacle to the main flow of the air.

On the other hand, as shown in FIG. 7, in the short portion 735, the length of the guide portion 731 cannot be secured. Note that the reference example shown in FIG. 7 illustrates a structure in which the length of the guide portion 731 cannot be secured in the short portion 735 and the cylindrical portion 730 and the bent portion 733 are continuous. As described above, in the short portion 735 where the length of the guide portion 731 cannot be ensured, it is not possible to form an air flow along the guide portion 731. For this reason, in this portion, as the protruding portion 732 becomes an obstacle to the main flow of the air flowing in the direction shown by the arrow Y, as shown by the arrow A2 in FIG. It has been confirmed by the inventor that an airflow in the opposite direction is formed, and air retention occurs. Such stagnation of air causes an inflow loss, and as a result, the air volume of the blower 7 may be reduced.

Therefore, in the blower 7 of the present embodiment, the first portion provided at a position corresponding to the long portion 734 of the shroud 73 at the protrusion 732 and the first portion provided at a position corresponding to the short portion 735 of the shroud 73 at the protrusion 732. The length of the protruding portion 732 is changed between the second portion and the second portion.

Specifically, as shown in FIG. 6, in the first portion 732a provided at a position corresponding to the longitudinal portion 734 of the shroud 73 in the protruding portion 732, the length along the flow direction Y of the air flow is “ L21 ". The length L21 is a length from the base end B11 to the front end T11 of the first portion 732a in the flow direction Y of the airflow. In FIG. 6, the position of the base end portion B11 of the first portion 732a in the flow direction Y of the airflow is indicated by “Y11”, and the position of the distal end portion T11 is indicated by “Y12”.

On the other hand, as shown in FIG. 8, in the second portion 732b provided at a position corresponding to the short portion 735 of the shroud 73 in the protruding portion 732, the position Y21 of the base end B12 is the same as that of the first portion 732a. It is shifted to the upstream side in the flow direction Y of the air flow from the position Y11 of the base end B11. The position of the tip T12 of the second portion 732b is set to “Y12”, that is, the same position as the tip T11 of the first portion 732a. Accordingly, the length L22 of the second portion 732b along the flow direction Y of the airflow is longer than the length L21 of the first portion 732a.

The protruding portion 732 is formed such that the length along the flow direction Y of the air flow gradually increases from the first portion 732a to the second portion 732b. Specifically, as shown in FIG. 5, when a position in the rotation direction about the axis m1 is represented by “θ”, the long part 734 is located at the rotation position θ1, and the short part 735 is located at the rotation position. It is assumed that it is located at θ2. At this time, the first portion 732a of the protrusion 732 is located at the rotation position θ1, and the second portion 732b of the protrusion 732 is located at the rotation position θ2. When the respective positions of the first portion 732a and the second portion 732b of the protruding portion 732 are defined in this way, the length of the protruding portion 732 is set as shown in FIG. That is, assuming that an intermediate position between the rotational position θ1 and the rotational position θ2 is “θ3”, the length L of the protrusion 732 is set to a constant value L21 in the section from the rotational position θ1 to the rotational position θ3. I have. The length L of the protruding portion 732 is formed so as to gradually increase from “L21” to “L22” in the section from the rotation position θ3 to the rotation position θ2.

According to the blower 7 of the present embodiment described above, the following functions and effects (1) to (4) can be obtained.
(1) The second portion 732b of the protrusion 732 provided at a position corresponding to the short portion 735 of the guide portion 731 is the first portion 732a of the protrusion 732 provided at a position corresponding to the long portion 734 of the guide portion 731. 8, an air flow is generated at the second portion 732b of the protrusion 732 along the protrusion 732 in the direction indicated by the arrow Y, as indicated by an arrow A3 in FIG. It will be easier. This makes it difficult for the protruding portion 732 to become an obstacle to the main flow of the air flowing in the direction indicated by the arrow Y, so that the air flows in the direction opposite to the direction indicated by the arrow Y as shown in FIG. Airflow is less likely to be generated. As a result, the retention of air is less likely to occur, so that the inflow loss can be improved. Further, since it is possible to suppress the turbulence of the air flow, it is possible to reduce noise.

(2) As shown in FIG. 9, the length of the protruding portion 732 in the direction along the flow direction Y of the air flow is from the intermediate portion between the first portion 732a and the second portion 732b toward the second portion 732b. It is formed so that it becomes longer gradually. Accordingly, since the shape of the protrusion 732 can be smoothly changed, the flow of the air generated by the fan 70 is less likely to be hindered by the protrusion 732 while changing the length of the protrusion 732. As a result, the turbulence of the air flow hardly occurs, so that the noise can be reduced.

(3) The stay 72 is disposed upstream of the fan 70 in the airflow direction Y. According to such a configuration, since the shroud 73 and the stay 72 can be integrally molded by a mold, the manufacture of the blower 7 becomes easy.
(4) The shroud 73 has a rectangular cross section orthogonal to the flow direction Y of the air flow, and is formed in a flat shape. In such a flat shroud 73, since the guide portion 731 is provided with the long portion 734 and the short portion 735, it is particularly preferable to adopt a structure like the protruding portion 732 of the present embodiment. It is valid.

Note that the above embodiment can also be implemented in the following forms.
The shroud 73 of the above embodiment has a shape in which the guide portion 731 does not substantially exist in the short portion 735, but the guide portion 731 shorter than the long portion 734 is provided in the short portion 735. It may have a different shape.

The protruding portion 732 may be formed so that the length of the air flow in the direction along the flow direction Y gradually increases from the first portion 732a toward the second portion 732b.
-In the blower 7 of the said embodiment, the stay 72 may be arrange | positioned with respect to the fan 70 at the downstream of the flow direction Y of an airflow.

The present disclosure is not limited to the above specific examples. The above-described specific examples in which a person skilled in the art appropriately changes the design are also included in the scope of the present disclosure as long as they have the features of the present disclosure. The components included in each of the specific examples described above, and their arrangement, conditions, shapes, and the like are not limited to those illustrated, but can be appropriately changed. The elements included in each of the specific examples described above can be appropriately changed in combination as long as no technical inconsistency occurs.

Claims

It has a plurality of blades (700) radially provided about a predetermined axis and an annular fan ring (701) connecting the tips of the plurality of blades, and rotates about the axis. A fan (70) for generating an airflow therefrom;
A cylindrical portion (730) arranged to cover the outer periphery of the fan with a predetermined gap between the fan ring and a radially outer portion centered on the axis from the outer periphery of one end of the cylindrical portion; A guide portion (731) formed so as to spread out and guide an air flow generated by rotation of the fan; and an annular projecting portion formed to project from an inner peripheral surface of one end of the cylindrical portion. (732) and a shroud (73) having
The guide section,
A longitudinal portion (734) in which a distance from a radially outer edge around the axis to the fan ring is set to a predetermined distance;
A short portion (735) in which a distance from a radially outer edge around the axis to the fan ring is shorter than the predetermined distance;
When a portion provided at a position corresponding to the long portion in the protruding portion is a first portion (732a), and a portion provided at a position corresponding to the short portion in the protruding portion is a second portion (732b). ,
The protrusion is formed such that a length of the second portion along the flow direction of the air flow is longer than a length of the first portion along the flow direction of the air flow. Blower.
2. The blower according to claim 1, wherein the protrusion is formed such that a length along a flow direction of the air flow gradually increases from the first portion toward the second portion. 3.
The projecting portion is formed so that a length along a flow direction of the air flow gradually increases from a middle portion between the first portion and the second portion toward the second portion. 2. The blower according to 1.
A motor (71) provided at a central portion of the fan and for applying torque to the fan;
A stay (72) formed so as to extend radially outward from the motor about the axis and having a tip fixed to the shroud and supporting the fan and the motor;
The blower according to any one of claims 1 to 3, wherein the stay is disposed upstream of the fan in a flow direction of the airflow.
The blower according to any one of claims 1 to 4, wherein the shroud has a rectangular cross section orthogonal to the flow direction of the air flow and has a flat shape.