JPWO2020148905A1 - Blower - Google Patents

Abstract

An outer casing (3) having an intake port (5) and a discharge port (6) and a centrifugal blower (30) housed inside the outer casing (3) are provided, and the intake port is provided by the centrifugal blower (30). The blower (50) that sucks in air from (5) and blows out the air flow from the discharge port (6) is the anti-motor side suction port (7) and the motor side suction port (7) of the centrifugal blower (30) from the intake port (5). In the air passage leading to the mouth (8), it is installed at a position that does not come into contact with the centrifugal blower (30), faces the intake port (5), and the centrifugal blower (30) side is concave. The centrifugal blower (30) is provided with a flow dividing plate (11) bent toward the anti-motor side suction port (7) and the motor side suction port (8), and the end of the flow dividing plate (11) from the bending apex (11p). The length of the bent portion (11b), which is a portion up to the portion (11a), is the intersection with the suction port surface (2a) of the centrifugal blower (30) on the extension of the bent portion (11b) and the apex (11p). Shorter than the length between.

Description

The present invention relates to a blower device in which a centrifugal blower is incorporated in an outer casing.

As the ventilation device installed in the space behind the ceiling, a blower equipped with a centrifugal blower may be used. The centrifugal blower incorporated in the blower has a fan, a motor for driving the fan, and a scroll casing for accommodating the fan.

Air is sucked in from the intake port of the outer casing by driving the fan, and air is blown out from the discharge port of the outer casing through the centrifugal blower. When the wind passes through the inside of the outer casing, pressure loss occurs inside the outer casing due to the turbulence of the air flow, and the air volume decreases.

In the blower device disclosed in Patent Document 1, a rectifying member for rectifying airflow turbulence is attached to the outside of the scroll casing accommodating the fan and the inside of the outer casing accommodating the centrifugal blower to reduce the pressure loss generated inside the outer casing. It is decreasing. The cross section of the rectifying member of the blower device disclosed in Patent Document 1 is triangular, and has a triangular prism shape in contact with the scroll casing. The air sucked from the intake port of the outer casing is diverted into the airflow toward the suction port on the anti-motor side and the suction port on the motor side of the scroll casing. At this time, by arranging the triangular prism-shaped rectifying member, the diversion becomes smooth, and the separated air flows along the triangular prism-shaped rectifying member to be rectified and the pressure loss is reduced.

Japanese Patent No. 3309703

In a blower device provided with a rectifying member as disclosed in Patent Document 1, in order to smoothly separate the airflow toward the suction port on the anti-motor side and the airflow toward the suction port on the motor side, a position separated from the scroll casing to some extent. It is necessary to separate the flow with. The blower device disclosed in Patent Document 1 has a problem that the rectifying member becomes large because the rectifying member is in contact with the scroll casing in order to rectify the air after splitting.

The present invention has been made in view of the above, and an object of the present invention is to obtain a blower device capable of suppressing an increase in size of a rectifying member and reducing a pressure loss.

In order to solve the above-mentioned problems and achieve the object, the present invention includes an outer casing having an intake port and a discharge port, and a centrifugal blower housed inside the outer casing, and the intake port is provided by the centrifugal blower. It is a blower that sucks air from the air and generates an air flow that blows out from the discharge port. It is installed at a position where it does not come into contact with it, and is provided with a flow dividing plate that faces the intake port and is bent toward the suction port on the anti-motor side and the suction port on the motor side so that the centrifugal blower side is concave. The length of the bent portion, which is a portion from the apex to the end of the bent portion of the flow dividing plate, is shorter than the length between the intersection and the apex of the suction port surface of the centrifugal blower on the extension of the bent portion.

The blower device according to the present invention has the effect of suppressing the increase in size of the rectifying member and reducing the pressure loss.

Perspective view of the blower device according to the first embodiment of the present invention. Sectional drawing of the blower device which concerns on Embodiment 1. The figure which shows the flow velocity of the airflow generated by the blower which concerns on Embodiment 1. The figure which shows the blowing efficiency of the blowing device which concerns on Embodiment 1. Sectional drawing of the blower device which concerns on Embodiment 2 of this invention Sectional drawing of the blower device which concerns on Embodiment 3 of this invention

Hereinafter, the blower device according to the embodiment of the present invention will be described in detail with reference to the drawings. The present invention is not limited to this embodiment.

Embodiment 1.
FIG. 1 is a perspective view of a blower device according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of the blower device according to the first embodiment. FIG. 2 shows a cross section of the blower 50 at the center in the height direction. The blower 50 according to the first embodiment is installed in the space behind the ceiling of the building. A duct installed behind the ceiling is connected to the duct connection component 9. The blower 50 according to the first embodiment sucks indoor air and exhausts it to the outside for ventilation. The blower device 50 is a double suction type in which a motor side suction port 8 and an anti-motor side suction port 7 are provided on two opposite sides of the scroll casing 2, that is, both the motor side and the anti-motor side. .. The suction port surface 2a of the scroll casing 2 forms the suction port surface of the centrifugal blower 30. The suction port surface 2a is a flat surface including a surface of the scroll casing 2 provided with the motor-side suction port 8 or a surface provided with the anti-motor side suction port 7 extended to the outside of the scroll casing 2.

A centrifugal blower 30 is housed inside the outer casing 3 that forms the outer shell of the blower device 50. In the centrifugal blower 30, the fan 4 and a part of the motor 1 are housed inside the scroll casing 2. When the fan 4 is driven by the motor 1, air flows in from the intake port 5 as shown by the working fluid flow 10 indicated by the arrow in FIG. 2, and becomes the suction port 7 on the opposite motor side of the centrifugal blower 30. It is sucked into the fan 4 from the suction port 8 on the motor side and blown out from the discharge port 6.

In the blower 50 according to the first embodiment, a flow dividing plate 11 installed facing the intake port 5 is provided. The flow dividing plate 11 is bent so that the centrifugal blower 30 side is concave. That is, in the flow dividing plate 11, the end portion 11a of the flow dividing plate 11 is located closer to the centrifugal blower 30 than the apex 11p of the bending. In the axial direction of the rotation axis of the motor 1, the distance between the apex 11p and the suction port 8 on the motor side and the distance between the apex 11p and the suction port 7 on the anti-motor side are equal. The length L of the bent portion 11b, which is a portion between the apex 11p and the end portion 11a, is between the intersection C of the scroll casing 2 with the suction port surface 2a on the extension of the bent portion 11b and the apex 11p. Shorter than length A. The flow dividing plate 11 is not in contact with the centrifugal blower 30.

In the blower device 50 according to the first embodiment, the air flowing into the outer casing 3 from the intake port 5 comes into contact with the bent portion 11b of the flow dividing plate 11, and the airflow toward the suction port 7 on the anti-motor side and the motor side. It is rectified by being diverted into the airflow toward the suction port 8 and flowing along the divergence plate 11. Since the rectifying action by the flow dividing plate 11 is maintained until the airflow passes through the flow dividing plate 11 and is sucked into the anti-motor side suction port 7 or the motor side suction port 8, the intake port 5 to the anti-motor side suction port 7 And the separation of the airflow to the suction port 8 on the motor side and the generation of vortices are reduced, and the airflow becomes smooth in the direction of the air passage from the intake port 5 to the discharge port 6, which is the anti-motor side suction port of the scroll casing 2. It will be sucked into 7 or the suction port 8 on the motor side. Therefore, the blower device 50 according to the first embodiment can reduce the pressure loss.

FIG. 3 is a diagram showing the flow velocity of the air flow generated by the blower according to the first embodiment. It can be confirmed that the air flowing in from the intake port 5 is diverted and rectified by the bent portion 11b of the divergence plate 11, and the rectifying action is maintained even after passing through the divergence plate 11. That is, it can be confirmed that the flow dividing plate 11 acts as a rectifying member.

FIG. 4 is a diagram showing the ventilation efficiency of the blower device according to the first embodiment. FIG. 4 also shows the ventilation efficiency of the blower device without the flow dividing plate 11 and the blower efficiency of the blower device in which the triangular prism-shaped rectifying member in contact with the scroll casing is arranged as in Patent Document 1. It can be seen that the flow dividing plate 11 included in the blower device 50 according to the first embodiment has the same effect of improving the blower efficiency as the triangular prism-shaped rectifying member in contact with the scroll casing. If the pressure loss is reduced, the ventilation efficiency is improved. Therefore, the blower device 50 according to the first embodiment is designed to reduce the pressure loss in the same manner as the blower device in which the triangular prism-shaped rectifying member in contact with the scroll casing is arranged. You can see that.

In the blower device 50 according to the first embodiment, since the flow dividing plate 11 is separated from the scroll casing 2, it is possible to suppress the increase in size of the flow dividing plate 11 which is a rectifying member. Further, since the diversion plate 11 installed separately from the scroll casing 2 acts as a rectifying member, the pressure loss can be reduced.

Embodiment 2.
FIG. 5 is a cross-sectional view of the blower according to the second embodiment of the present invention. The parts common to the blower device 50 according to the first embodiment are designated by the same reference numerals as those in the first embodiment, and the description thereof will be omitted. The blower device 50 according to the second embodiment includes a flow dividing plate 11 installed facing the intake port 5. The flow dividing plate 11 is bent toward the centrifugal blower 30. The length of the bent portion 11b toward the anti-motor side suction port 7 is L1, and the length of the bent portion 11b toward the motor side suction port 8 is L2. The relationship between the length A between the intersection C with the suction port surface 2a of the scroll casing 2 and the apex 11p on the extension of the bent portion 11b and the lengths L1 and L2 of the bent portion 11b is L1> A /. 3> L2. That is, the length L1 of the bent portion 11b toward the anti-motor side suction port 7 and the length of the bent portion 11b toward the motor side suction port 8 are different from each other.

In the blower device 50 according to the second embodiment, the air flowing in from the intake port 5 comes into contact with the bent portion 11b of the flow dividing plate 11, so that the airflow toward the anti-motor side suction port 7 and the airflow toward the motor side suction port 8 It is split into and rectified. Since the blower 50 according to the second embodiment more rectifies the airflow toward the anti-motor side suction port 7, the airflow toward the anti-motor side suction port 7 is larger than the airflow toward the motor side suction port 8.

Since the motor 1 is present in the air passage of the motor side suction port 8, the air passage is narrower and the flow velocity is larger than that of the anti-motor side suction port 7, which tends to cause an increase in noise and an increase in pressure loss. .. The blower device 50 according to the second embodiment adjusts the lengths L1 and L2 of the bent portion 11b of the flow dividing plate 11 to balance the flow rates between the airflow toward the anti-motor side suction port 7 and the airflow toward the motor side suction port 8. It can be controlled by. Since the pressure loss is smaller as the flow rate is smaller, the pressure loss can be controlled by adjusting the lengths L1 and L2 of the bent portion 11b.

Embodiment 3.
FIG. 6 is a cross-sectional view of the blower according to the third embodiment of the present invention. The parts common to the blower device 50 according to the first embodiment are designated by the same reference numerals as those in the first embodiment, and the description thereof will be omitted. The blower device 50 according to the third embodiment includes a flow dividing plate 11 installed facing the intake port 5, and the flow dividing plate 11 is bent toward the centrifugal blower 30 side to the suction port 7 on the anti-motor side. The length of the bent portion 11b toward the motor side is L1, and the length of the bent portion 11b toward the motor-side suction port 8 is L2. The relationship between the length A between the intersection C with the suction port surface 2a of the scroll casing 2 and the apex 11p on the extension of the bent portion 11b and the lengths L1 and L2 of the bent portion 11b is L2> A /. 3> L1. That is, the length L1 of the bent portion 11b toward the anti-motor side suction port 7 and the length of the bent portion 11b toward the motor side suction port 8 are different from each other.

In the blower device 50 according to the third embodiment, the air flowing in from the intake port 5 comes into contact with the bent portion 11b of the flow dividing plate 11, so that the air flow toward the anti-motor side suction port 7 and the air flow toward the motor side suction port 8 However, since the airflow toward the motor side suction port 8 is more rectified, the airflow toward the motor side suction port 8 becomes larger than the airflow toward the anti-motor side suction port 7.

When the centrifugal blower 30 is a double suction type, the motor 1 is air-cooled by using the airflow toward the suction port 8 on the motor side to increase the output of the motor 1 or cool the motor 1 as compared with the case without air cooling. It is possible to reduce the number of cooling fins to be used and to reduce the cost by downsizing the motor 1. The blower 50 according to the third embodiment adjusts the flow rate balance between the airflow toward the anti-motor side suction port 7 and the airflow toward the motor side suction port 8 by adjusting the lengths L1 and L2 of the bent portion 11b of the flow dividing plate 11. It can be controlled by doing. Since the air cooling effect is more effective as the flow rate increases, the cooling effect can be controlled by adjusting the lengths L1 and L2 of the bent portion 11b.

The configuration shown in the above-described embodiment shows an example of the content of the present invention, can be combined with another known technique, and is one of the configurations without departing from the gist of the present invention. It is also possible to omit or change the part.

1 Motor, 2 Scroll Casing, 2a Suction Port Surface, 3 Outer Casing, 4 Fan, 5 Intake Port, 6 Discharge Port, 7 Anti-Motor Side Suction Port, 8 Motor Side Suction Port, 9 Duct Connection Parts, 10 Working Fluid Flow , 11 diversion plate, 11a end, 11b bend, 11p apex, 30 centrifuge blower, 50 blower.

Claims (6)

An outer casing having an intake port and a discharge port and a centrifugal blower housed inside the outer casing are provided, and the centrifugal blower sucks air from the intake port and generates an air flow to be blown out from the discharge port. It ’s a blower,
It is installed at a position not in contact with the centrifugal blower in the air passage from the intake port to the suction port on the anti-motor side and the suction port on the motor side of the centrifugal blower, and faces the intake port. It is provided with the anti-motor side suction port and the flow diversion plate bent toward the motor side suction port so that the centrifugal blower side is concave.
The length of the bent portion, which is a portion from the apex to the end of the bent of the flow dividing plate, is larger than the length between the intersection with the suction port surface of the centrifugal blower and the apex on the extension of the bent portion. A blower characterized by being short. The blower according to claim 1, wherein the length of the bent portion toward the anti-motor side suction port and the length of the bent portion toward the motor side suction port are different from each other. The second aspect of the present invention is characterized in that the length L1 of the bent portion toward the suction port on the anti-motor side and the length L2 of the bent portion toward the suction port on the motor side satisfy the relationship L1> L2. The blower described. The length L1 of the bent portion toward the anti-motor side suction port, the length L2 of the bent portion toward the motor side suction port, and the length A between the intersection and the apex are L1>. The blower according to claim 3, wherein the relationship of A / 3> L2 is satisfied. The second aspect of the present invention is characterized in that the length L1 of the bent portion toward the suction port on the anti-motor side and the length L2 of the bent portion toward the suction port on the motor side satisfy the relationship L2> L1. The blower described. The length L1 of the bent portion toward the anti-motor side suction port, the length L2 of the bent portion toward the motor side suction port, and the length A between the intersection and the apex are L2>. The blower according to claim 5, wherein the relationship of A / 3> L1 is satisfied.

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