JP3216617U - Roof ventilation fan - Google Patents

Abstract

In a rooftop ventilation fan for exhaust air with a casing having a rectangular tube shape and a hood having an angular shape in a plan view, an air flow sent from the fan is divided into a high-speed airflow and a low-speed airflow to be led to a discharge port, and a motor Reduce the load.
SOLUTION: An exhaust roof ventilation fan 1 has a semi-cylindrical shape, and four separate fluid component pieces 7A each having a trapezoidal shape in plan view by cutting both ends in the length direction at an angle of 45 degrees. Combining them as a set to form a split fluid 7 having an angle in plan view. The split fluid is disposed between the casing 2 and the hood 5 with its opening side down, and its inner end 7 'is from the inner surface 2a of the casing. It is located on the inner side and is arranged so that its outer end 7 ″ is located on the outer side of the outer side surface 2b of the casing.
[Selection] Figure 2

Description

  The present invention relates to a roof ventilation fan that is installed on the roof of a building such as a factory and ventilates the building.

  On the roofs of buildings such as factories, roof ventilation fans are installed to ventilate the buildings. And there are two types of roof ventilation fans, such as those that exhaust and those that perform intake. And the roof ventilation fan which exhausts the inside is generally a cylindrical casing which has an opening on each of the upper side and the lower side, a fan built in the casing, a motor for rotating the fan, The upper part of the casing held at a predetermined interval on the upper part of the casing is covered with an opening on the upper side, and a hood is formed between the inner side surface and the outer side surface of the casing.

  The wind has a property of flowing along the surface, and in a roof ventilation fan that performs such exhaust, the wind sent out by the fan rises along the inner surface of the casing, and the wind that reaches the hood moves along the inner surface of the hood. Flowing. In this case, there is a large deviation in the wind speed depending on the position of the discharge port. In addition, turbulent flow due to pressure difference is generated in the hood, which causes an excessive load on the motor and decreases the capacity of the roof ventilation fan.

  Therefore, in the prior art, a semi-cylindrical separation fluid is provided between the casing and the hood so that the inner end is located inside the casing inner surface and the outer end is located outside the casing outer surface. Thus, the air sent out by the fan is diverted to the casing side and the hood side, so that operation at a low load, and thus power saving and noise reduction are achieved.

  By the way, in such a roof ventilation fan for exhaust, the casing has a cylindrical shape and the hood has a round shape in plan view, and the casing has a rectangular tube shape, and the hood has a corresponding plan view angle. There are two types, one with a shape.

  In the conventional roof ventilation fan in which the former casing is cylindrical and the hood has a round shape in plan view, a semi-cylindrical plate is rounded in plan view between the casing and the hood. A formed fluid was provided.

However, in the roof ventilation fan in which the latter casing has a rectangular tube shape and the hood has a corresponding angle shape in plan view, a member corresponding to the above-described fluid separation has not been provided. For this reason, the above problems have not been solved at all for the rooftop ventilation fan.

In addition, for the roof ventilation fan in which the casing is in the shape of a rectangular tube and the hood has an angle shape in plan view, when trying to forcibly install the fluid in which the semi-cylindrical plate material is formed in a round shape in plan view, As shown in FIG. 7, a sufficient diversion effect cannot be obtained at the four corner portions (the circled portion) in the hood, and the intended effect cannot be obtained sufficiently. FIG. 7 shows a roof ventilation fan whose casing has a rectangular tube shape and the hood has a planar viewing angle corresponding thereto, in which 100 is a roof ventilation fan, 101 is a rectangular tubular casing, and 102 is a planar viewing angle. A hood 103 having a shape is a divided fluid in which a semi-cylindrical plate material is formed in a round shape in plan view.

  Therefore, the present inventors have intensively studied the fluid that can be optimally implemented in a roof ventilation fan for exhaust, in which the casing has a rectangular tube shape and the hood has a shape corresponding to the angle in plan view.

  As a result, it has been found that the divided fluid needs to have a planar viewing angle shape that matches the casing and the hood. In this case, as shown in FIG. 4, a sufficient diversion effect can be obtained even at the four corner portions (the circled portions) in the hood, and the intended effect can be sufficiently obtained. is there.

  However, it has been found that there is a problem in terms of means for forming the separation fluid in a planar viewing angle shape that matches the casing and the hood. That is, in the case of the conventional fluid having a round shape in plan view, the entire shape is continuous with the same curve in a round shape, so that the whole can be integrally formed in one step. On the other hand, in the case of a planar viewing angle shape, since the four straight sides are connected at right angles, the whole cannot be integrally formed in one step.

  Therefore, as a result of further study on such a point, the present inventors, as a result, a semi-cylindrical shape, a fluid separation piece having a trapezoidal shape in plan view by cutting both ends in the length direction at an angle of 45 degrees, It has been found that the intended fluid can be formed by forming a split fluid having a planar view angle shape by combining four sheets as a set, and the present invention has been completed.

  The present invention provides the above-described conventional problems by providing a fluid as described above in the exhaust roof exhaust fan in which the casing has a rectangular tube shape as described above and the hood has an angular shape in plan view. It can be made to be able to eliminate.

  Further, as described above, in the rooftop exhaust fan for exhaust, in which the casing has a rectangular tube shape and the hood has a corresponding angle shape in plan view, the semicylindrical shape as described above has both ends in the length direction of 45 degrees. The separated fluid component pieces, which are cut into the shape of a trapezoid in plan view, are combined as a set of four pieces to form a separated fluid in the shape of a planar view angle, and the separated fluid is placed on the opening side of the casing. If the inner end is located inside the casing inner surface and the outer end is located outside the casing outer surface between the hood and the hood, the conventional problems It was found that the problem can be solved.

Further, another type of roof ventilation fan for supplying air different from that for exhausting has the same configuration as that for exhausting and the air flow is reversed.
The configuration is as shown in FIG. 8, in which 100 'is a roof ventilation fan for supplying air. Reference numeral 101 denotes a rectangular tube-like casing having openings 101A and 101B on the upper side and the lower side, 102 denotes a fan built in the casing 101, and 103 denotes a motor for rotating the fan 3. 104 covers the upper opening 101B of the casing 101 held at a predetermined interval above the casing 101, and forms a suction port 105 between the inner side surface 104a and the outer side surface 101b of the casing 101. It is a hood with a planar view shape.

  Further, 106 is a semi-cylindrical shape, and the fluid separation component pieces 106A, which are formed into a trapezoidal shape in plan view by cutting both end portions in the length direction at an angle of 45 degrees, are combined into a set of four pieces to form a plan view angle shape. The formed fluid. Then, the fluid 106 is located between the casing 101 and the hood 104 with its opening side down, and its inner end 106 ′ is located on the inner side of the inner side surface 101 a of the casing 101. The end 106 ″ is disposed outside the outer surface 101b of the casing 101. Reference numeral 107 denotes a support member for the fluid separation component 106A.

  Thus, in such a roof ventilation fan 100 ′ for supplying air, the air sucked from the suction port 105 is drawn into the casing 101 as a whole by being diverted into and out of the inside by the diverting fluid 106. become. As a result, the load on the motor 103 is greatly reduced.

  Thus, the same effect can be acquired also in the roof ventilation fan for supply with the same structure.

  Thus, the present invention intends to provide a roof ventilation fan that can obtain the above-described effect regardless of whether it is configured for exhaust or supply.

  Thus, the gist of the present invention is that a rectangular cylindrical casing having openings on the upper side and the lower side, a fan built in the casing, a motor for rotating the fan, In the roof ventilation fan that is held at a predetermined interval on the upper part and covers the opening on the upper side in the casing, and is formed of a hood having an angular shape in plan view that forms an air circulation port between the inner side surface and the outer side surface of the casing. A semi-cylindrical shape is formed by cutting the both ends in the length direction into 45 ° angles to form a trapezoidal shape in plan view, and as a set of four pieces, a fluid having a shape in plan view angle is formed. The fluid is placed between the casing and the hood with the opening side down, and the inner end is located inside the casing inner surface and the outer end is outside the casing outer surface. In The roof ventilators, characterized in that formed by arranged to location. The air circulation port serves as a discharge port when it is a rooftop exhaust fan for exhaust, and as a suction port when it is a rooftop fan for supply of air.

  The present invention is configured as described above, and is a roof-top ventilation fan for exhaust air in which the casing has a rectangular tube shape and the hood has a corresponding angle shape in plan view. The separated fluid component pieces cut into an angle of degree and formed into a trapezoidal shape in plan view are combined as a set of four pieces to form a divided fluid in a planar view angle shape, and the divided fluid is placed with its opening side down, The casing is arranged between the hood and the inner end thereof is located inside the inner side surface of the casing, and the outer end thereof is located outside the outer side surface of the casing. The problem in the case where the above-described fluid is not provided can be solved.

  Further, in the case of a rooftop ventilation fan (not shown) for supplying air with the same configuration as described above but with only the air flow reversed, the air was sucked from the inlet as in the case shown in FIG. Air can be drawn smoothly into the casing as a whole, and the load on the motor can be greatly reduced.

It is a perspective view of the rooftop exhaust fan for exhaust_gas | exhaustion which concerns on embodiment of this invention. It is the front view shown notching the same part. It is the left side view. It is the top view shown by notching the same part. It is a top view of the fluid component piece equally divided. It is a perspective view of a fluid component piece equally divided. FIG. 6 is a partially cutaway plan view for explaining a problem when a fluid is provided in a round shape in plan view in a rooftop ventilation fan for exhaust having a square tube shape and a hood shape in a plan view angle shape. FIG. 5 is a partially cutaway front view illustrating an advantage when a fluid having a planar view angle is used in a rooftop ventilation fan for air supply whose casing has a rectangular tube shape and a hood having a planar view angle shape.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  In the figure, reference numeral 1 denotes a roof ventilation fan for exhaust. The exhaust roof exhaust fan 1 is installed on a roof of a factory or the like (not shown) to ventilate the building.

The exhaust roof exhaust fan 1 includes a rectangular tubular casing 2 having openings 2A and 2B on the upper side and the lower side, a fan 3 housed in the casing 2, and a motor for rotating the fan 3, respectively. 4 and the upper opening 2B of the casing 2 held at a predetermined interval above the casing 2 is covered, and a discharge port 6 is formed between the inner surface 5a and the outer surface 2b of the casing 2. The hood 5 has a planar viewing angle shape.

Further, the exhaust roof ventilation fan 1 according to the present embodiment is a semi-cylindrical shape, and is a fluid separation component piece that is formed in a trapezoidal shape in plan view by cutting both end portions in the length direction at an angle of 45 degrees. 7A are combined as a set of four to form a split fluid 7 having a planar view shape, and the split fluid 7 is placed between the casing 2 and the hood 5 with the opening side facing down. The end 7 'is located inside the inner surface 2a of the casing 2, and the outer end 7 "is located outside the outer surface 2b of the casing 2. Reference numeral 8 denotes the above. This is a support member for the fluid separation component 7A.

Next, the operation of the above embodiment will be described.
The rooftop ventilation fan 1 for exhaust according to the present embodiment has a semi-cylindrical shape, and is composed of four separate fluid component pieces 7A each having a trapezoidal shape in plan view by cutting both end portions in the length direction at an angle of 45 degrees. Combined as a set to form a split fluid 7 having an angle in plan view. The split fluid 7 is disposed between the casing 2 and the hood 5 with its opening side down, and an inner end 7 ′ of the casing 2. Since the outer end 7 ″ is located on the inner side of the inner side surface 2 a and is located on the outer side of the outer side surface 2 b of the casing 2, it is generated near the outer periphery of the fan 3, and the casing 2 Among the airflows flowing toward the hood 5 along the inner surface 2a, the airflow having a relatively high wind speed is received by the separation fluid 7, and the direction is smoothly changed to the discharge port 6 along the inner surface of the separation fluid 7. On the other hand, the air flow generated around the inner periphery of the fan 3 is relatively The slow airflow reaches the hood 5 without coming into contact with the separation fluid 7, and the slow airflow reaching the hood 5 passes between the separation fluid 7 and the hood 5 along the inner surface of the hood 5. At this time, since the wind speed is slow, the direction can be changed with a relatively small pressure loss, so that the direction of the air flow generated by the fan 3 to the discharge port 6 is flowed according to the speed of the air flow. Since the direction is changed, the pressure loss can be reduced even if the airflow hits the hood 5. In the present embodiment, the casing 2 has a rectangular tube shape, and the hood 5 corresponds to this. As shown in FIG. 4, in the exhaust roof ventilation fan 1 having a planar viewing angle shape, a sufficient diversion effect can be obtained even in the four corner portions (the circled portions) in the hood 5.

  Further, although not shown, in the case of a roof ventilation fan for supplying air with the same configuration as that of the above-described embodiment in which only the air flow is reversed, the air is sucked from the inlet as in the case shown in FIG. Thus, the air can be drawn smoothly into the casing as a whole, and the load on the motor can be greatly reduced.

DESCRIPTION OF SYMBOLS 1 Roof exhaust fan for exhaust 2 Casing 3 Fan 4 Motor 5 Hood 6 Discharge port 7 Fluid 7A Fluid component piece 8 Support member of fluid component piece

Claims (1)

An upper part of the casing, which is held at a predetermined interval on the upper part of the casing, a rectangular tubular casing having openings on the upper side and the lower side, a fan built in the casing, a motor for rotating the fan, and the upper part of the casing. In the roof ventilation fan that covers the opening on the side and is composed of a hood having a planar view angle shape that forms an air circulation port between the inner side surface and the outer side surface of the casing,
A semi-cylindrical shape is formed by cutting the both ends in the length direction into 45 ° angles to form a trapezoidal shape in plan view, and as a set of four pieces, a fluid having a shape in plan view angle is formed. The fluid is placed between the casing and the hood with the opening side down, and the inner end is located inside the casing inner surface and the outer end is outside the casing outer surface. A roof ventilation fan characterized by being arranged so as to be located at the top.

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