WO2006049054A1

WO2006049054A1 - Radiator shroud structure

Info

Publication number: WO2006049054A1
Application number: PCT/JP2005/019669
Authority: WO
Inventors: Naoya Kakishita; Itsuhei Kori; Tetsuzo Furuichi; Makoto Kameda; Yuji Inoue; Masayuki Ogasawara
Original assignee: Mitsubishi Fuso Truck And Bus Corporation
Priority date: 2004-11-04
Filing date: 2005-10-26
Publication date: 2006-05-11
Also published as: KR20070062594A; DE112005002765T5; KR100850624B1; US20080193286A1; AU2005301832A1

Abstract

A radiator shroud structure, wherein a shroud (15) fitted to a radiator (13) on the air discharge side is formed in a convergent cylindrical shape converged toward a centrifugal flow type rotary fan (11) and a surrounding part (17) is formed so as to surround the rotary fan (11). A guide part (23) extending in the centrifugal direction of the rotary fan (11) is formed at the peripheral edge part of the surrounding part (17), a cylindrically-shaped cylindrical part (19) with a diameter smaller than that of the surrounding part (17) is formed on the inside of the surrounding part (17), and the upper part of the cylindrical part is fixed to the wall surface of the shroud (15). Also, the lower part of the cylindrical part (19) is fixed to the shroud through a fixing part (21) having an inner diameter equal to the diameter of the cylindrical part and an outer diameter equal to the diameter of the surrounding part (17).

Description

Rajeta shroud structure

Technical field

TECHNICAL FIELD [0001] The present invention relates to a radiator for guiding air provided between a radiator and a fan of a vehicle, and more particularly, to rectify a flow of air discharged by a rotating fan force and improve a ventilation amount of the radiator. It is possible for Rajeta 's shroud structure.

Background art

[0002] In a vehicle such as a cab-over type vehicle 1, as shown in FIG. 5, an engine unit 5 having a radiator 13 and a rotating fan 11 is mounted under the cab 3 and illustrated! Air (wind) is taken in the direction of arrow B from the air intake provided on the front panel to increase the cooling capacity of the radiator 13. A shroud 15 is provided between the radiator 13 and the rotary fan 11, and guides the air discharged from the radiator 13 to the rotary fan 11.

In order to improve the cooling capacity, it is important to secure a larger amount of air passing through the radiator 13, and for this purpose, a proposal has been made to devise the shape of the shroud (see Patent Document 1).

Patent Document 1: Japanese Patent Laid-Open No. 2002-38952

As shown in FIGS. 6 and 7, the shroud 15 is usually attached to the radiator 13 and has a shape surrounding the outer periphery of the rotary fan 11. That is, as shown in FIG. 6, since the radiator 13 has a generally rectangular structure, the shroud 15 is rectangular at the connecting portion with the radiator 13. In addition, since the radiator 13 is installed at an angle in order to efficiently use the space, the lower side of the shroud 15 has a shape that constricts against the rotating fan 11, and is formed on the outer periphery of the rotating fan 11. When it reaches, it has the surrounding part 17 which comprises the cylindrical shape which surrounds the rotation fan 11. FIG. On the other hand, the rotary fan 11 is attached to the engine unit 5 because the rotation fan 11 normally rotates when the rotation of the crankshaft of the engine unit 5 is transmitted in the carry-over type vehicle 1.

[0004] The air that has passed through the radiator 13 passes through the shroud 15 and is discharged through the rotary fan 11. Due to vehicle design, the gap between the fan tip and the shroud must be increased. At this time, if an axial fan is installed, the air flow force between the fan tip and the shroud ^ The air volume passing through the radiator 13 is reduced. Therefore, installing a fan that generates a centrifugal flow can prevent leaks that cause a reduction in airflow.

Disclosure of the invention

Problems to be solved by the invention

[0005] When the rotating fan 11 that generates a centrifugal flow while providing a force is provided, the airflow exhausted from the rotating fan 11 only in the direction of the centrifugal flow 23 is on the side of the radiator 13 (in front of the vehicle 1). However, there is a problem that the turbulence is changed while the direction is changed (turbulent flow turbulence 29), or a counter flow 25 is generated in the shroud.

FIG. 8 shows a simulation result of the flow of air discharged from the rotary fan 11 when the conventional shroud 15 is used. The part shown in black is the part of the turbulence. According to this, the blade tip force of the rotating fan 11 The flow force of the discharged air The turbulent direction of the radiator 13 direction, that is, the turbulence of the centrifugal flow 29 may flow while changing to the counter flow 2 5 toward the inside of the shroud. Recognize.

When the turbulence of the centrifugal flow 29 occurs, the turbulence of the air is generated at the tip of the surrounding portion 17, and the air flow from which the radiator 13 force is also discharged passes through the vicinity of the surrounding portion 17, so that the ventilation amount of the radiator 13 is reduced. Problem arises. This leads to a decrease in the cooling capacity of the radiator.

[0007] Further, the counter-current backflow 25 upstream of the fan obstructs the flow of air discharged from the radiator 13, and changes the flow by directing the central portion of the rotary fan 11 as shown in FIG. Airflow from the motor 27). As a result, the flow rate of the air flowing through the radiator 13 is reduced, resulting in a problem that the cooling capacity of the radiator 13 is lowered.

[0008] The present invention has been made in view of such a problem, and an object of the present invention is to rectify the flow of air exhausted by the rotating fan force and improve the ventilation rate of the radiator, thereby cooling the radiator 13. Rajeta's ability to improve the capacity is to provide a shroud structure.

Means for solving the problem

[0009] The present invention for solving the above-described problems forms a rotating fan that generates a centrifugal flow, a radiator that is provided in the vicinity of the rotating fan, and an air guide path that is directed from the radiator to the rotating fan. A radiator with a shroud that has a shroud structure, a shroud that surrounds the outer periphery of the rotating fan at one end of the shroud, a cylindrical portion having a smaller diameter than the surrounding portion, and one end of the cylindrical portion And a fixing portion that fixes the cylindrical portion to the inside of the surrounding portion so as to oppose the rotating fan, and the fixing portion is formed in the shroud so as to block the ventilation outside the cylindrical portion. Rajeta shroud structure.

It is preferable that the cylindrical portion be installed so that the cylindrical portion approximately equal to the diameter of the rotating fan is in parallel with the outer peripheral portion of the rotating fan. It is preferable that the distance from the peripheral edge of the cylindrical portion to the rotating fan is as small as possible without contacting the ang. More preferably, it is provided with a guide part extending in the outer peripheral direction from the periphery of the surrounding part.

[0010] That is, since the shroud is attached to the radiator and the rotary fan is attached to the engine side, they vibrate in different systems when traveling, so there is a gap so that the rotary fan and the cylindrical portion do not contact each other. It is necessary to provide and design. In addition, it is inevitable to provide a certain gap in consideration of manufacturing errors and thermal deformation. On the other hand, the smaller the distance between the cylindrical part and the rotating fan, the more the rotating fan can prevent backflow to the shroud. Therefore, the distance between the cylindrical part and the rotating fan should be designed to be as small as possible.

Therefore, from these conditions, the width of the cylindrical part should be designed so that the distance between the peripheral part of the cylindrical part and the rotary fan is about 20 mm. The width of the guide portion is preferably about 6% of the diameter of the rotating fan.

[0011] As described above, by providing the guide portion at the peripheral portion of the shroud enclosure, the blade tip force of the rotary fan causes air directed in the centrifugal direction to flow along the guide portion, and the airflow is rectified. In addition, a cylindrical portion having a smaller diameter than the surrounding portion is provided inside the surrounding portion of the shroud, and this is fixed by the fixing portion so as to face the rotating fan. Can be prevented.

The invention's effect

[0012] With the radiator of the present invention 's shroud structure, the rotating fan can also prevent the inflow of air flowing back into the shroud and the flow rate of air passing through the radiator is improved, so that the cooling capacity of the radiator is improved. Is possible.

Brief Description of Drawings

[0013] FIG. 1 is a cross-sectional view of a radiator 's shroud structure that is useful in an embodiment of the present invention. [Fig.2] Perspective view of rajta shroud structure

[Fig. 3 (a)] Diagram explaining air flow

[Fig. 3 (b)] Diagram explaining air flow

[Figure 4] Relationship between each shroud structure and radiator air flow

[Fig.5] Illustration of the structure of a cab-over type vehicle

[Figure 6] Perspective view of conventional radiator / shroud structure

[Fig.7] Cross-sectional view of conventional radiator

[Fig.8] Simulation result of air flow in case of conventional radiator / shroud structure

[0014] 1 Cabover type vehicle

3 Cap

5 Engine part

11 Rotating fan

13 Rajeta

15 Shroud

17 Go Club

19 Cylindrical part

21 Fixed part

23 Guide section

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Fig. 1 is a cross-sectional view of a radiator 's shroud structure, which is useful for the embodiment of the present invention, Fig. 2 is a perspective view of the rajta' shroud structure, and Fig. 3 is a perspective view of the air by the rajta 's shroud structure of this embodiment. Fig. 4 shows the relationship between the various shroud structures and the air flow rate of the radiator.

In FIG. 1, the radiator 13 is attached to a frame extending below the cap 3 of the cap-over type vehicle 1. In the figure, the left side of the radiator 13 is the forward direction of the vehicle 1. The radiator 13 is often installed at an angle as shown in the figure to improve surface efficiency. The

On the other hand, in the case of a freight vehicle, the rotary fan 11 often employs a system in which rotation is transmitted by a belt from a pulley provided on the crankshaft of the engine to a pulley provided on the rotary shaft of the rotary fan 11. In this case, the rotary fan 11 is attached to the engine unit 5 existing on the right side of the rotary fan 11 in the figure.

The rotary fan 11 has an axial flow type and a centrifugal flow type. However, if an axial fan is mounted, the airflow is clogged at the gap between the fan tip and the shroud and the amount of air passing through the radiator 13 is reduced. The On the other hand, installing a fan with centrifugal flow can prevent leaks that cause a reduction in airflow. Accordingly, it is desirable to use the centrifugal fan 11. The centrifugal flow type rotary fan 11 can be obtained by considering the mesh of the radiator 13 and the shape of the fan of the rotary fan 11.

In the centrifugal flow type rotary fan 11, since most of the air flowing out from the radiator 13 through the rotary fan 11 goes out in the centrifugal direction of the rotary fan 11, it can be discharged to the rear of the engine part, avoiding the engine part 5. Is possible.

A shroud 15 is provided to guide the air flow exiting through the radiator 13 to the rotating fan 11.

The shroud 15 is made of, for example, metal or resin, and is attached to the radiator 13. As shown in FIG. 2, since the radiator 13 has a rectangular shape, the mounting portion of the shroud 15 to the radiator 13 has a rectangular shape, narrows toward the rotating fan 11 and surrounds the rotating fan 11. Further, in the vicinity of the rotary fan 11, it is formed into a cylindrical shape. The surrounding part 17 is provided in the part shape | molded by the cylindrical shape.

In addition, since the radiator 13 is installed at an angle and the rotary fan 11 is installed at a position higher than the radiator 13, the upper part of the shroud 15 also has a force that attaches to the upper part of the radiator 13 and extends upward from the radiator 13. To.

[0019] In the radiator 'shroud structure of the present embodiment, a guide force 23 is provided in the peripheral direction of the surrounding portion 17 in the centrifugal direction of the rotary fan 11 to prevent the centrifugal flow from being disturbed, and the cylindrical inside the shroud 15 A portion 19 and a fixed portion 21 are provided to prevent backflow of air from the rotary fan 11 into the shroud 15. However, the guide portion 23 can be omitted. [0020] The guide portion 23 has a disk shape whose inner diameter is equal to the diameter of the surrounding portion 17, and may be fixed to the peripheral portion of the surrounding portion 17 with a rivet or the like, or integrated with the surrounding portion 17 and other shroud portions. You may shape | mold as. The width of the guide part 23 may be about 6% of the diameter of the rotary fan 11. For example, when the diameter of the rotary fan 11 is 500 mm, the width of the guide part 23 may be 30 mm.

On the other hand, the cylindrical portion 19 is preferably concentric with the surrounding portion 17 and has a small diameter cylindrical shape, and is approximately equal to the diameter of the rotary fan 11. The cylindrical portion 19 is attached to the shroud 15 so as to be in parallel with the rotary fan 11.

That is, as shown in FIG. 1, the cylindrical portion 19 is directly attached to the wall surface of the shroud 15 at the upper portion of the shroud 15 where the surrounding portion 17 protrudes from the upper portion of the radiator 13. On the other hand, in the lower part, the cylindrical part 19 is fixed to the shroud 15 by the fixing part 21 .The fixing part 21 has an outer diameter equal to the diameter of the cylindrical part 19 and the diameter of the surrounding part 17. It has a nearly equivalent crescent shape and is fixed to the peripheral portion of the go portion 17 on the side of the radiator 13. Then, the cylindrical portion 19 is fixed to the shroud 15 by fixing the cylindrical portion 19 to the inner diameter portion of the fixing portion 21.

The cylindrical portion 19 is fixed to the upper portion of the shroud 15 and the fixing portion 21 with a rivet or the like, and the fixing portion 21 is similarly fixed to the peripheral portion of the surrounding portion 17 on the side of the radiator 13 with a rivet or the like.

Also, the shorter the gap G between the tip of the cylindrical part 19 and the rotary fan 11, the smaller the backflow 25 entering the shroud 15 and the higher the rate of change of the air volume, so the width W of the cylindrical part 19 is longer. Good enough. In reality, however, the shroud 15 is attached to the radiator and the rotary fan 11 is attached to the engine part 5.Therefore, the width W of the cylindrical part 19 is set so as to ensure a minimum gap where they do not come into contact with each other due to vibration during running. Set. For example, if the width W of the cylindrical portion 19 is set so that the gap G between the tip of the cylindrical portion 19 and the rotary fan 11 is about 20 mm, the air volume passing through the radiator 13 is sufficiently improved.

[0023] Fig. 3 (a) is a cross-sectional view of the upper portion of the radiator 13, shroud 15, and rotary fan 11 of the present embodiment, and shows the flow of air. By fixing the cylindrical portion 19 to the inside of the surrounding portion 17, the counter-current backflow is generated inside the shroud from the cylindrical portion 19 of the shroud 15. The rotary fan 11 is discharged in the centrifugal direction without entering the side. Even if a part of the backflow 25 flows into the cylindrical portion 19, the cylindrical portion 19 can suppress the flow rate to a small amount.

[0024] As described above, the backflow 25 flowing from the rotary fan 11 into the cylindrical portion 19 is prevented or reduced, so that the airflow 27 from the radiator flows into the rotary fan 11 without being blocked by the backflow 25. Is possible. As a result, the amount of air passing through the radiator 13 is increased and the cooling performance is improved.

On the other hand, as shown in FIG. 3 (b), in the lower portion of the shroud 15, the backflow 25 that is directed toward the inside of the shroud prevents the inflow of the fan 11 upstream by the fixed portion 21 and the cylindrical portion 19. Is possible. As a result, the airflow 27 from the radiator 13 can travel straight to the rotating fan 11 without being blocked by the backflow 25, and the amount of air passing through the radiator 13 increases.

[0025] FIG. 4 is a diagram showing a comparison of the air flow rate of the radiator between the conventional shroud structure and the shroud structure of the present embodiment. Each shroud structure is prototyped, and the results measured by bench tests are shown. In the figure, a portion where the cylindrical portion 19 and the fixed portion 21 are combined is called a partition wall.

[0026] First, the radiator air flow rate in the case where a partition wall made up of the cylindrical portion 19 and the fixed portion 21 is provided in the conventional shroud structure is 3.2% higher than the air flow rate in the case of the conventional shroud structure! This is the result when the width of the cylindrical part 19 is designed so that the gap G between the rotary fan 11 and the tip of the cylindrical part 19 is about 20 mm.

On the other hand, if only the guide part 23 (when the width is 30 mm, which is about 6% of the diameter of the rotary fan 11) is provided in the conventional shroud structure, the air flow rate is increased by 2.9% compared to the conventional shroud. did.

Further, in the case of the shroud structure according to the present embodiment in which both the partition wall and the guide portion 23 are provided, the air flow rate is increased by 7.8% as compared with the conventional shroud.

[0027] As a result of this experiment, even if only one of the partition wall or the guide part 23 is provided, the air flow rate increases. If both the partition wall and the guide part 23 are provided, the effect of providing only the partition wall and the guide part 2 It can be seen that the effect obtained by adding only the effects of 3 is obtained. It has been shown that it is desirable to provide both the guide part 23 and the guide part 23.

[0028] As described above, the guide portion 23 is provided on the peripheral portion of the surrounding portion 17 of the shroud 15, the cylindrical portion 19 is provided on the inner side of the shroud 15, and the fixing portion 21 is provided on the lower portion of the shroud 15. By fixing the cylindrical part 19, it is possible to rectify the flow of air discharged from the rotating fan 11 in the centrifugal flow, increase the air volume of the air passing through the radiator 13, and improve the cooling capacity of the radiator 13. become.

[0029] It should be noted that the present invention is not limited to the above-described embodiment, and various modifications are possible, and these are also included in the technical scope of the present invention. For example, in the present embodiment, the width of the guide portion 23 is about 6% of the diameter of the rotary fan 11 and the width of the cylindrical portion 19 is set so that the distance between the tip of the cylindrical portion 19 and the rotary fan 11 is about 20 mm. Set force This can be set to a different width in consideration of the shape of the shroud 15 and the rotating fan 11 and the rate of change of the air volume. The shroud may be fixed by an engine or a frame that is not a radiator. Further, the present invention can be applied not only to a cab type vehicle but also to a bonnet type vehicle.

Industrial applicability

[0030] The radiator of the present invention 's shroud structure rectifies the turbulence of the centrifugal flow coming out of the rotary fan 11 by the guide portion 23, and the internal force of the shroud 15 is reversed by the partition wall made up of the cylindrical portion 19 and the fixed portion 21. Thus, the air volume of the air passing through the radiator 13 is increased, and the cooling capacity of the radiator 13 can be improved.

Claims

The scope of the claims

[1] A rotating fan that generates centrifugal flow;

A radiator provided close to the rotating fan;

A rajta shroud structure comprising a shroud that forms a wind guide path directed to the rotary fan, and

A surrounding portion that surrounds the outer periphery of the rotary fan at one end of the shroud;

A cylindrical portion having a smaller diameter than the surrounding portion;

A fixing portion that fixes the cylindrical portion to the inside of the surrounding portion so that one end of the cylindrical portion faces the rotary fan;

The fixed portion is formed in the shroud so as to block the ventilation outside the cylindrical portion.

Rajta shroud structure characterized by that.

2. The diameter of the cylindrical part is set so that the cylindrical part, which is substantially equal to the diameter of the rotating fan, is arranged in parallel with an outer peripheral part of the rotating fan. Radiator Euloud structure.

[3] The width of the cylindrical portion is such that the peripheral edge portion of the cylindrical portion does not contact the rotary fan, and the peripheral edge force of the cylindrical portion is also a length that is small enough to allow the distance to the rotary fan. The radiator according to claim 1, wherein the structure is a shroud.

[4] The radiator 's shroud structure according to claim 1, wherein the width of the cylindrical portion is designed so that a distance between a peripheral portion of the cylindrical portion and the rotary fan is about 20 mm.

[5] A guide portion extending in the outer peripheral direction from the periphery of the surrounding portion is provided.

The radiator according to claim 1, wherein the structure is a shroud.

6. The radiator / shroud structure according to claim 5, wherein a width of the guide portion is about 6% of a diameter of the rotary fan.

7. The diameter of the cylindrical part is set so that the cylindrical part, which is substantially equal to the diameter of the rotary fan, is arranged in parallel with the outer peripheral part of the rotary fan. Radiator Euloud structure.