JP2001165094A - Air flow guide member, or cooling fan device or heat exchanger therewith - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air flow guide member, or a cooling fan device or a heat exchanger with the guide member capable of preventing an aerodynamic performance from lowering by changing the shape of a shroud casing portion so as to increase the aerodynamic performance and decrease a noise in the air flow guide member, or the cooling fan or heat exchanger with the guide member. SOLUTION: This air flow guide member comprises a bell mouth disposed on an air flow suction side and a diffuser of S-shape in circumferential cross-section disposed on a delivery side and expanding along the inclined angle expanding in the direction of delivery flow formed integrally with each other. A cooling fan device or heat exchanger comprises the guide members. By these devices, air flow is stabilized so as to eliminate the disturbance of air flow due to vortex separation or the like, pressure loss is suppressed, and noise reduction can be achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airflow guide member for improving aerodynamic performance and reducing noise, or a cooling fan or a heat exchange device provided with the guide member.

[0002]

2. Description of the Related Art An outline of a conventional heat exchanger in which a cooling fan having an airflow guide member is arranged will be described with reference to FIG. FIG. 5 shows a schematic configuration of a conventional heat exchange device in which a cooling fan having an airflow guide member is arranged,
(A) is the side view, (b) is a front view.

[0003] 1 is a heat exchanger, 2 is a shroud casing arranged at the outlet of the heat exchanger 1, 4 is a cooling fan arranged in the shroud casing 2, 5 is a fan guard covering the cooling fan 4, and 6 is Is a fan driving device that is disposed outside the fan guard 5 and drives the cooling fan 4.

That is, a cooling fan 4 for generating an air flow for cooling the heat exchanger 1 is arranged following an orifice-shaped shroud casing 2 provided downstream of the heat exchanger 1 and is mechanically connected. The heat exchanger 1 is rotated by an appropriate engine or a fan driving device 6 such as a motor to generate a flow of a cooling airflow passing through the heat exchanger 1 to cool the heat exchanger 1.

[0005]

In the conventional heat exchanger 1 configured as described above, since the design needs are required to be small and thin and to improve the heat transfer coefficient, the heat exchanger 1 is required. No. 1 tends to increase the pressure loss.

Accordingly, the fan discharge flow is bent from the axial flow to the diagonal flow having a swirling flow or the centrifugal (radial) flow d, and the flow between the downstream side surface of the shroud casing 2 and the main flow. In the meantime, a separation vortex c is generated, and there is a problem that aerodynamic performance is reduced and fan noise is increased due to airflow turbulence in the fan air passage and energy loss due to discharge of the high-speed swirling flow.

The present invention solves such problems in the prior art, and prevents such deterioration in aerodynamic performance by changing the shape of the shroud casing portion, thereby realizing improved aerodynamic performance and reduced noise. It is an object of the present invention to provide a guide member or a cooling fan or a heat exchange device provided with the guide member.

[0008]

Means for Solving the Problems The present invention has been made to solve the above-mentioned problems, and the first means is as follows: a bell mouth disposed on an air intake side; The present invention provides an airflow guide member integrally formed with a diffuser having an S-shaped circumferential cross section that expands along an inclination angle that expands in the direction.

That is, according to the first means, the airflow guide member integrally forms the bell mouth on the suction side and the diffuser on the discharge side, and the diffuser on the discharge side with respect to the bell mouth on the suction side. Since the air flow has an S-shaped cross-section in the circumferential direction that expands along the inclination angle that expands in the discharge flow direction, the air flow reduces the suction pressure loss by the bell mouth, smoothens the suction flow, increases the air volume, and discharges the diffuser inlet. So that it is corrected to the axial component by the smooth flow along the curvature of the diffuser and the inside curvature at the outlet side of the diffuser, there is no turbulence of air flow due to separation vortex etc., pressure loss is suppressed, and noise is reduced. It was done.

According to a second aspect of the present invention, there is provided the airflow guide member according to the first means, wherein a cooling fan having an outer diameter smaller than the inner diameter of the airflow guide member is provided in the airflow guide member. A cooling fan device provided with:

That is, according to the second means, the cooling fan device is provided with the cooling fan in the guide member integrally formed by the bell mouth on the suction side and the diffuser on the discharge side. In the cooling fan, a sufficient amount of air with a smooth flow is supplied from the bell mouth, and the discharge flow from the diffuser suppresses pressure loss as a suitable cooling fan device without generation of separation vortex and aims to reduce noise It was done.

Further, the present invention provides, as a third means, a heat exchange device provided with a cooling fan device provided with a heat exchanger upstream of the airflow guide member in the first or second means. To provide.

That is, according to the third means, a suitable airflow guide member which suppresses pressure loss and reduces noise, or a suitable cooling fan device cooperating with the guide member is provided. Then, a heat exchanger is disposed, and the air flow in the downstream side of the heat exchanger is smoothed, thereby further improving the efficiency over the entire heat exchange device.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. FIGS. 1A and 1B schematically show the entire appearance of a heat exchanger including a cooling fan device according to the present embodiment, wherein FIG. 1A is a side view, FIG. 1B is a front view, and FIG. (A) is a sectional view in the diameter direction, (b) is a side view, and (c) is (a). It is a D section enlarged view of.

In order to avoid redundant description, in the present embodiment, the same parts as those of the conventional one are denoted by the same reference numerals in the drawings, and duplicate description will be omitted. The points that are unique to the embodiment will be mainly described.

That is, in this embodiment, 1 is a heat exchanger, 2 is a shroud casing, 3 is a bell mouth integrated with an S-shaped diffuser, 4 is a cooling fan, 5 is a fan guard, and 6 is a fan drive. .

As shown in detail in FIG. 2, the bell mouth 3 integrally formed with the S-shaped diffuser is provided with a mounting flange 3c for mounting the shroud casing 2 on the suction end side of the bell mouth 3 corresponding to the upstream side. ,
A plurality of fan guard mounting plates 5a which protrude in the circumferential direction for mounting the fan guard 5 are provided on the diffuser discharge end side corresponding to the downstream side, and reinforcing plates 3b are interposed at a plurality of positions spaced at predetermined intervals in the circumferential direction. In addition, the structure is divided into two semicircular shapes which can be separated in the vertical direction as a whole.

Here, the S-shaped portion of the S-shaped diffuser has an S-shaped cross section in the outer peripheral portion in the circumferential direction, and as shown in detail in FIG. The cross section has an S-shape along the inclination angle θ that expands toward the downstream side.

Normally, since the heat exchanger 1 has a high pressure loss,
When the cooling fan 4 is driven to rotate, the airflow tends to turn in the same direction as the rotation of the fan, to flow in a diagonal flow, and to be discharged as a centrifugal flow.

When the shroud casing 2 is of an orifice type as in the above-described conventional apparatus, the main flow bends obliquely or centrifugally from the axial flow direction, so that the downstream surface of the shroud casing 2 and the main flow are separated. A separation vortex c is generated in between, and disturbs the air flow.

However, in this embodiment, the bell mouth 3 having the S-shaped diffuser integrated as described above is used.
Is mounted on the downstream surface of the shroud casing 2 so that the turbulence is eliminated. Is corrected.

The curvature R forming the inner curved portion on the diffuser outlet side depends on the pressure loss of the preceding heat exchanger 1, but it is desirable that the curvature be such that it does not become a resistance to the flow of discharge from the fan. Is preferably 5 to 10% of the fan diameter, and for a fan having a diameter of 600 mm, R
= The range of 30 to 60 mm is the optimum curvature.

In the diffuser, the flow in the wake of the S-shaped portion is set to an inclination angle θ (45 °) that matches the fan discharge flow angle (radial direction), so that the flow of the air flow is further smoothed. And stable ejection is achieved.

Thus, according to the present embodiment, the lost dynamic pressure is recovered by the swirling airflow, the air flow is increased, the cooling effect is improved, and the turbulence of the airflow is suppressed by the S-shaped diffuser. Therefore, the noise is low.

Further, by using the bell mouth 3 on the suction side, the suction pressure loss is reduced, the suction flow becomes smooth, and the air volume increases.

Further, since the bell mouth 3 integrated with the S-shaped diffuser has the mounting flange 3c on the upstream surface of the suction side bell mouth, the bell mouth 3 is additionally provided to the conventional orifice type shroud casing 2. The shroud casing 2 can be mounted, the air volume can be increased and the noise in the shroud casing 2 can be increased, and the noise can be reduced.

That is, as described above, in the conventional device, the cooling fan 4 is rotated by the fan driving device 6 to cool the heat exchanger 1 by the air volume, but the pressure loss of the heat exchanger 1 increases. Then, the airflow b turns in the same direction as the rotation of the cooling fan 4, becomes a diagonal flow, and further a centrifugal (radial) flow d, and is bent from the axial flow direction, so that the downstream side surface of the shroud casing 2 and Separation vortex c is generated between the main flow and the air flow, disturbing the air flow, resulting in loss energy, which is a disadvantage that the aerodynamic performance is reduced and the fan noise is increased.
By equipping the downstream side of the shroud casing 2 with an S-shaped diffuser having a small cross section in the circumferential direction along the fan discharge flow and having a small curvature, airflow turbulence due to the separation vortex c generated by the swirling airflow is eliminated and smooth discharge is performed. Make a flow,
By recovering the lost energy and making the suction side bell-mouth shaped, the suction pressure loss is reduced,
It is possible to obtain a suitable airflow guide member, a cooling fan device provided with the guide member, or a heat exchange device in which the suction flow becomes smooth and the air flow increases.

Next, a second embodiment of the present invention will be described with reference to FIG.
It will be described based on. FIGS. 3A and 3B schematically show the whole appearance of the cooling fan applied to the radiator of the large vehicle according to the present embodiment, wherein FIG. 3A is a side view and FIG. 3B is a front view.

In this embodiment, the same parts as those of the conventional one or the first embodiment are denoted by the same reference numerals in the drawings so that the description is not redundant. The overlapping description will be omitted, and the points unique to the present embodiment will be mainly described.

That is, in the present embodiment, reference numeral 11 denotes a radiator of a large vehicle which is a kind of heat exchanger, 12 denotes a fan shroud, 3 denotes a bell mouth integrated with an S-shaped diffuser, 4 denotes a cooling fan, and 15 denotes a cooling fan. A fan support, 16 is a fan drive mechanism, 7 is a pulley, and arrow a indicates an airflow direction.

Here, the bell mouth 3 integrated with the S-shaped diffuser is connected to the fan shroud 12 of the cooling fan 4.
Is directly connected by a mounting flange or the like to the downstream side.

In the present embodiment configured as above, when the engine of the automobile is started, the cooling fan 4 is rotated by the fan drive mechanism 16 directly connected to the engine, and the radiator 11 is cooled by the air flow. In recent years, noise reduction is increasingly required, and the radiator 1
No. 1 is a small and thin type and an improvement in heat transfer coefficient, and the pressure loss of the heat exchanger is increasing.

When the pressure loss of the radiator 11 increases,
The air flow a turns in the same direction as the rotation of the cooling fan 4 and tends to flow in a diagonal direction and further in a centrifugal direction (radial direction).

As described above, when the air current bends from the axial flow direction into a diagonal flow or a centrifugal flow, a separation vortex is generated between the downstream side surface of the fan shroud 12 and the main flow, disturbing the air flow.
The turbulence of the airflow becomes energy loss, which degrades aerodynamic performance and increases fan noise.

However, in the present embodiment, the downstream side surface of the fan shroud 12 where the separation vortex is generated
By installing the bell mouth 3 integrated with the S-shaped diffuser, the air flow from the fan shroud 12 becomes a smooth flow according to the shape of the S-shaped diffuser, energy is recovered, the air volume increases and the fan noise decreases. Sound.

Thus, according to the present embodiment, it is not necessary to particularly increase the space for vehicles, and the bell mouth 3 integrated with the S-shaped diffuser having a simple structure and light weight prevents a decrease in air performance. However, a suitable radiator for reducing fan noise, that is, a heat exchange device can be obtained.

Next, a third embodiment of the present invention will be described with reference to FIG.
It will be described based on. FIGS. 4A and 4B schematically show the whole appearance of a cooling fan applied to the cooling tower according to the present embodiment, wherein FIG. 4A is a side view and FIG. 4B is a front view.

In the present embodiment, the same parts as those of the conventional one or the first and second embodiments are denoted by the same reference numerals in the drawings so that the description is not redundant. The following description focuses on points that are unique to the present embodiment, omitting redundant description.

That is, in the present embodiment, the cooling fan shroud of the cooling tower is devised. 10 is a cooling tower, 21 is a heat exchanger, 4 is a cooling fan, and 3 is an integrated S-shaped diffuser. Bell mouth, 25 is a fan support, 7 is a pulley, 22 is a fan shroud, 26 is a fan drive mechanism (motor), and arrow a indicates an airflow direction.

Here, the bell mouth 3 is disposed in the fan shroud 22 with the bell mouth portion arranged on the suction port side of the cooling fan 4 and the S-shaped diffuser facing the discharge side, and integrated with the S-shaped diffuser.

In the present embodiment configured as above, the cooling fan 4 is rotated by the fan drive mechanism 26 via the pulley 7, and the air flow a is along the bell mouth 3 in which the S-shaped diffuser is integrated. Due to the bell-mouth shape on the suction side, a smooth suction flow is achieved, the pressure loss is reduced, the air volume is increased, and the cooling effect is improved.

Also, on the discharge side, the turbulence of the airflow is suppressed by the S-shaped diffuser, and the noise can be reduced. In addition, since many of the cooling towers 10 are installed outdoors, it is important to reduce noise from the viewpoint of environmental protection, and a suitable cooling device that can also improve the cooling efficiency, that is, A heat exchange device was obtained.

Although the present invention has been described with reference to the illustrated embodiments, the present invention is not limited to such embodiments.
It goes without saying that various changes may be made to the specific structure within the scope of the present invention.

[0044]

As described above, according to the first aspect of the present invention, the bell mouth arranged on the suction side of the airflow and the bell mouth arranged on the discharge side expand along the inclination angle expanding in the discharge flow direction. Since the airflow guide member is formed integrally with the diffuser having an S-shaped cross-section in the circumferential direction, the airflow reduces the suction pressure loss by the bell mouth, smoothens the suction flow, increases the air flow, and increases the discharge flow. Is corrected to the axial component by the smooth flow along the curvature of the diffuser inlet and the inner curvature at the diffuser outlet side, there is no turbulence of the air flow due to separation vortex, etc., suppressing pressure loss and reducing noise Thus, it is possible to obtain a suitable airflow guide member that achieves improved aerodynamic performance and reduced noise with a simple configuration.

According to a second aspect of the present invention, a cooling fan having an outer diameter smaller than the inner diameter of the airflow guide member according to the first aspect of the present invention is disposed in the guide member. Since a cooling fan device with a guide member of the same air flow is configured, the cooling fan is supplied with a sufficient amount of smooth flow from the bell mouth, and the discharge flow from the diffuser generates pressure loss without generation of separation vortex. It is possible to obtain a suitable cooling fan device which suppresses noise, achieves low noise, and has improved aerodynamic performance and low noise with a simple configuration.

According to the third aspect of the present invention, the airflow guide member of the first aspect of the invention or the airflow guide member of the cooling fan device of the second aspect of the invention is provided. A heat exchanger is arranged in the heat exchanger, so that a pressure loss is suppressed and a suitable airflow guide member for reducing noise or a suitable cooling in cooperation with the guide member is provided. A heat exchanger is arranged in front of the fan device, and the airflow in the downstream of the heat exchanger is smoothed to achieve further efficiency over the entire heat exchange device. It is possible to obtain a suitable cooling fan device which has improved aerodynamic performance and reduced noise.

[Brief description of the drawings]

FIGS. 1A and 1B schematically show an entire heat exchanger including a cooling fan device according to a first embodiment of the present invention, wherein FIG. 1A is a side view and FIG. 1B is a front view.

FIGS. 2A and 2B show in more detail a guide member of an airflow discharge port integrally formed by a bell mouth and a diffuser, which are main parts of FIG. 1, wherein FIG.
(C) is an enlarged view of a D part of (a).

FIGS. 3A and 3B schematically show the whole appearance of a cooling fan applied to a radiator of a large vehicle according to a second embodiment of the present invention, wherein FIG. 3A is a side view and FIG. 3B is a front view.

FIG. 4 schematically shows a whole view of a cooling fan applied to a cooling tower according to a third embodiment of the present invention, and (a).
Is a side view, and (b) is a front view.

5A and 5B show a schematic configuration of a conventional heat exchange device in which a cooling fan having an airflow guide member is disposed, wherein FIG. 5A is a side view and FIG. 5B is a front view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat exchanger 2 Shroud casing 3 Bell mouth 3a Diffuser 3b Reinforcement plate 3c Mounting flange 4 Cooling fan 5 Fan guard 5a Fan guard mounting plate 6 Fan drive 7 Pulley 10 Cooling tower 11 Radiator 12 Fan shroud 15 Fan support 16 Fan drive mechanism 21 heat exchanger 22 fan shroud 25 fan support 26 fan drive mechanism

Claims (3)

[Claims] 1. A bell mouth arranged on a suction side of an air flow and a diffuser arranged on a discharge side and having an S-shaped cross section in a circumferential direction extending along an inclination angle expanding in a discharge flow direction. An airflow guide member, characterized in that: 2. The cooling fan according to claim 1, wherein a cooling fan having an outer diameter smaller than an inner diameter of the airflow guide member is disposed in the airflow guide member. apparatus. 3. The heat exchange device according to claim 1, wherein a heat exchanger is arranged upstream of the air flow guide member. 3. The heat exchange device according to claim 2, further comprising a cooling fan device according to claim 2. apparatus.