JPS5819291Y2 - Exhaust duct with rectifier plate - Google Patents

Description

[Detailed description of the invention] The present invention relates to an air exhaust duct with a rectifying plate that is formed to prevent turbulence that tends to occur in an air exhaust duct where space is limited and to increase the air blowing efficiency inside the duct. be.

Conventionally, exhaust ducts or air ducts that are subject to various space constraints, such as the exhaust duct of a cooling fan for a heat exchanger of a horizontal water-cooled internal combustion engine with heat exchanger cooling, and the supply air duct of a supercharged engine, are equipped with a fan. When the structure is such that the center line of the exhaust duct or the outlet of the ventilation duct must be bent with respect to the center line of the rotating shaft, turbulent flow of fluid occurs at the bent part, so the passage inside the duct is difficult. The disadvantage is that the resistance increases.

When the passage resistance inside the duct increases, it is necessary to increase the capacity of the blower fan or expand the area of the blower duct, which results in a decrease in mechanical efficiency, an increase in noise, and an oversized device, which reduces the blowing efficiency accordingly. There are drawbacks.

Therefore, in order to eliminate the above-mentioned conventional drawbacks, the present invention provides a rectifying plate on the outlet side of the exhaust duct to reduce the passage resistance in the exhaust duct, reduce the capacity of the cooling fan, and reduce the exhaust duct device. The purpose is to downsize the .

That is, in the present invention, in an exhaust duct provided with the center line of the outlet of the exhaust duct bent with respect to the center line of the rotation axis of the fan, the center line of the outlet of the exhaust duct is moved from the center line of the rotation axis of the upper part of the fan. This can be intercepted by providing a partition plate along the vicinity of the line.

Embodiments of the present invention will be described below with reference to the drawings.

First, the air-cooled heat exchanger 4 shown in the embodiment of the present invention shown in FIG.
The exhaust duct 1 of the cooling fan 2, which is installed on the top and is rotated by a pulley 5 for driving the cooling fan, is installed in a horizontal water-cooled engine mounted on an agricultural combine harvester, so it takes up less space when mounting a working machine. Due to the constraints, the structure must be installed so that the center line B-B of the outlet of the exhaust duct 1 is bent within the refraction angle θ = 120° with respect to the center line A-A of the rotation axis of the cooling fan 2. It has become.

Therefore, in the present invention, a partition plate 3 formed from the upper part of the cooling fan 2 along the center line A-A of the rotation axis of the cooling fan 2 to near the center line B-B of the exit part of the exhaust duct 1 is connected to the exhaust duct 1.
It is located facing the exit.

The fluid discharged from the cooling fan 2 and passing through the exhaust duct 1 by the partition plate 3 provided as described above flows along the partition plate 3 in the direction of arrow F without generating turbulence. This partition plate 3 serves as a rectifying plate within the exhaust duct 1.

Therefore, in FIG. 2, the amount of air discharged Q1 in a conventional exhaust duct having the same cross-sectional shape as the above embodiment and without a current plate, and the current flow rate Q1 as shown in the embodiment of the present invention in FIG. The exhaust air volume Q2 in the air exhaust duct 1 provided with the partition plate 3 is calculated as the experimental result under the same fan rotation speed, and the respective exhaust air volume Q (m”/PS-min)
is shown in a bar graph.

As can be seen from the above bar graph, it was also confirmed in the results of experiments using actual equipment that the air exhaust duct of the present invention with a rectifier plate has an increased exhaust air volume Q compared to the conventional one.

Therefore, if the ventilation duct with a straightening plate of the present invention is applied, there is an effect that the passage resistance in the ventilation duct is reduced, and thereby the capacity of the fan can be reduced.

Furthermore, there is no need to increase the cross-sectional area of the exhaust air passage of the exhaust duct, and the cross-sectional area can be reduced, which has the effect of making it possible to downsize the exhaust duct device.

Furthermore, since turbulence of fluid can be prevented from occurring within the duct, it is also effective in reducing noise in the duct.

The present invention can be effectively applied to a wide range of applications, such as the cooling fan exhaust duct for the heat exchanger of a horizontal water-cooled internal combustion engine mounted on a combine harvester for agricultural machinery, and the ventilation duct installed after various ventilation fans.

[Brief explanation of drawings]

Figure 1 is a side sectional view of the main part of the exhaust duct of a cooling fan for a heat exchanger in an embodiment of the present invention, and Figure 2 is the amount of air discharged in a conventional exhaust duct and an exhaust duct with a rectifier plate in an embodiment of the present invention. This is a bar line graph comparing . 1...Exhaust duct, 2...Cooling fan, 3...Partition plate, A-A...Center line of rotating shaft, B-B. ...Center line of the exit section.

Claims (1)

[Scope of utility model registration request] In the exhaust duct, where the center line of the outlet of the exhaust duct is bent with respect to the center line of the rotation axis of the fan, the center line of the outlet of the exhaust duct extends from the center line of the rotation axis of the upper part of the fan to the center line of the outlet of the exhaust duct. Exhaust duct I with a rectifying plate, which is provided with a partition plate formed along the side.