JP6584343B2 - Blower - Google Patents

Description

  The present invention relates to a blower device in which a centrifugal blower is incorporated in a box.

  A blower equipped with a centrifugal blower may be used as a device for ventilating a space under high humidity such as a bathroom or a kitchen. Such an air blower is configured by incorporating a centrifugal fan, a centrifugal fan having a centrifugal casing, a fan casing that houses the centrifugal fan, and an electric motor that drives the centrifugal fan, into a box. In addition, such a blower device is provided with a mechanism for draining drain water flowing into the blower device. Conventionally, as disclosed in Patent Document 1, several drain holes opened at the bottom of a box-shaped airframe are provided, a rail-shaped member is fixed to the bottom, and a drain pan is fitted to the rail-shaped member. The one with is known.

  In a blower equipped with such a drainage mechanism, since the position where the drain hole is generally provided is a negative pressure space inside the fuselage, a pressure difference occurs between the drain hole and the outside of the blower, and the drain water is Drainage into the drain pan is not started unless it has a certain head. For this reason, it is necessary to accumulate drain water in a blower more than a certain amount, and drainage during operation of the blower is difficult.

  As a countermeasure against the above problem, as disclosed in Patent Document 2, a technique is adopted in which a drain pan is made a part of an air path and a current plate is provided on the drain pan. By making the drain pan a part of the air path, a water head is not required for draining the drain pan, and a water head is required for draining the drain pan to the outside of the blower.

  Within the drain pan, drain water is easily collected at the drain pan outlet by the gradient of the bottom surface and the dynamic pressure of the airflow flowing along the current plate, and the water head is easily secured.

JP 2005-98653 A Japanese Patent No. 5434559

  However, in the technique disclosed in Patent Document 2, in order to maintain the airtightness between the drain pan and the main body outer shell, it is necessary to connect the drain pan and the main body outer shell at a plurality of locations around the entire circumference. It will decline.

  This invention is made | formed in view of the above, Comprising: It aims at obtaining the air blower which can discharge drain water even in operation | movement and prevented the fall of assembly property and maintainability.

  In order to solve the above-described problems and achieve the object, the present invention provides a box having a suction port and a discharge port, a centrifugal fan housed in the box, and a suction formed in the box. The blower includes an intake air passage that connects the opening and an intake port of the centrifugal blower, and generates an air flow that sucks air from the suction port and blows out from the discharge port by the centrifugal blower. In the present invention, the box includes a drain hole penetrating the bottom surface on the intake air passage, and the drain hole is provided at a corner of the outer casing.

  ADVANTAGE OF THE INVENTION According to this invention, drain water can be discharged | emitted even in operation, and there exists an effect that the air blower which prevented the fall of assembly property and maintenance property can be obtained.

The perspective view which shows the external appearance of the air blower which concerns on Embodiment 1 of this invention. Sectional drawing of the air blower which concerns on Embodiment 1. FIG. Analysis diagram of airflow flowing through suction air passage of blower according to Embodiment 1 Sectional drawing of the air blower which concerns on Embodiment 2 of this invention. Sectional drawing of the air blower which concerns on Embodiment 3 of this invention. The figure which shows another structure of the air blower which concerns on Embodiment 3. FIG.

  Hereinafter, a blower according to an embodiment of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a perspective view showing an appearance of the blower according to Embodiment 1 of the present invention. 2 is a cross-sectional view of the air blower according to Embodiment 1, and shows a cross section taken along line II-II in FIG. As shown in FIG. 1, the air blower according to Embodiment 1 is installed in a space behind a ceiling of a building, and a duct 12 provided on the back of the ceiling is attached to the blower main body 11 via a duct connecting component 9. . The air blower sucks indoor air and exhausts it outside the room for ventilation. The drain drain pipe 13 is attached to the drain pan 14 and drains drain water accumulated in the drain pan 14.

  The blower body 11 includes a centrifugal blower 22 housed in an outer casing 3 that is a box, and the scroll casing 2 of the centrifugal blower 22 includes an impeller 4 that is a fan of the centrifugal blower 22 and a motor 1. And some of them are installed. When the impeller 4 is driven by the motor 1, air flows into the outer casing 3 through the suction port 5 and the outer casing suction port 3a as in the working fluid flow 20 indicated by the arrows in FIG. The air flowing into the outer casing 3 is branched in two directions before the scroll casing 2 and is sucked into the scroll casing 2 from the fan side inlet 7 and the motor side inlet 8 which are the inlets of the centrifugal blower 22, respectively. It blows out from the discharge port 6 via the exhaust port 2a of the casing 2 and the outer casing exhaust port 3b. That is, an intake air passage 18 that connects the intake port 5 to the fan-side intake port 7 and the motor-side intake port 8 that are the intake ports of the centrifugal blower 22 is provided inside the outer casing 3.

The outer casing 3 is provided with a drain hole 10 penetrating the bottom surface 3d. A drain pan 14 is disposed below the blower body 11 so as to face the drain hole 10. The drain pan 14, there is disposed a drain down discharge Mizuguchi 15, the drain water inside the outer casing 3 through the drain discharge port 15, and is discharged from the drain discharge pipe 13.

  The drain hole 10 is installed at a corner 16 indicated by hatching in FIG. The corner 16 is a line G connecting a point F where an imaginary line K extending in the axial direction of the motor 1 from the upstream end 2c of the scroll casing 2 intersects the outer casing 3 and an edge E of the outer casing suction port 3a. And an area 16a, 16b surrounded by the outer casing 3 and a point I where the imaginary line L extending in the axial direction of the shaft 1a of the motor 1 intersects the outer casing 3 and a point H at the end of the fan side air inlet 7 of the scroll casing 2 Is a region 16 c surrounded by a line J connecting the two and the outer casing 3. Note that the point H at the end of the fan-side intake port 7 of the scroll casing 2 is a portion where the round chamfering of the bell mouth ends.

  Since the corner portion 16 is a portion where there is little airflow in the intake air passage 18, the wind speed is lower than the portion other than the corner portion 16. This is because when the airflow reaches from the outer casing suction port 3a to the fan side air intake port 7 and the motor side air intake port 8 of the centrifugal blower 22, when it passes through the corner portion 16, it becomes a detour and loses energy. The airflow passes through the corner 16 when there is more airflow through the path that does not go around, the wind speed increases, and the energy loss decreases when going around.

  Note that the intake air passage 18 on the motor side intake port 8 side has the motor 1 on the intake air passage 18 and has a narrower air passage width than the fan side. Therefore, the wind speed at which the loss of energy is reduced when the air current is detoured is slower than the fan side, and the detour path is also a wind path. For this reason, the M portion in FIG.

  As a result of the wind speed difference occurring in the intake air passage 18 in this way, the drain water inside the outer casing 3 is biased to the corner 16 due to the dynamic pressure difference. Since the drain hole 10 is provided in the corner portion 16, it is possible to generate a hydrodynamic head, and the amount of drain water that must be accumulated in the outer casing 3 is reduced, thereby improving drainage efficiency.

  FIG. 3 is an analysis diagram of the airflow flowing through the suction air passage of the blower according to the first embodiment. As shown in FIG. 3, the corner portion 16 has a low wind speed. In the illustrated example, the wind speed at the corner 16 is 2 m / s, whereas the wind speed at the wind path 19 is 13 m / s, and the dynamic pressure difference is about 99 Pa, or about 10 mm in terms of water head. It has become. That is, about 10 mm of drain water is biased to the corner 16 side compared to the normal air passage 19 side, the amount of drain water that must be accumulated in the outer casing 3 is reduced, and drainage efficiency is improved. . Moreover, since the drain pan 14 is fitted to the rail-like member 3e on the bottom surface 3d, as in the conventional structure, the assembling property and the maintenance property are not deteriorated.

Embodiment 2. FIG.
FIG. 4 is a cross-sectional view of the air blower according to Embodiment 2 of the present invention, showing a cross section taken along line IV-IV in FIG. In addition, about the structure similar to Embodiment 1, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  In the blower according to Embodiment 2, a drain pipe 21 is provided outside the drain hole 10 provided in the bottom surface 3d of the outer casing 3.

  In the drain hole 10, the connection part 10 a between the outer casing 3 and the drain pipe 21 is an area B hole, and the outlet part 21 a of the drain pipe 21 opposite to the connection part 10 a is an area C drain hole. It has become. The hole of the exit part 21a is such that area B> area C.

In the first embodiment, the head of the drain water is earned by utilizing the difference in the wind speed in the intake air passage 18, but the pressure difference between the portion of the drain hole 10 and the outside of the blower is the wind speed in the intake air passage 18. If it is larger than the water head that can be earned by the difference, drain water must be stored in the outer casing 3. However, since the air blower according to Embodiment 2 includes the drain pipe 21 and the area C of the drain hole of the outlet 21 a of the drain pipe 21 is smaller than the area B of the drain hole 10, The location where the atmospheric pressure difference occurs is not the drain hole 10 but the drain hole of the outlet 21 a of the drain pipe 21. Therefore, drain water is drained to the vicinity of the drain hole in the outlet portion 2 1a of the drain pipe 21, drain water located near the outlet portion 21a of the drain pipe 21, depending on the length D of the drain pipe 21 hydrocephalus have.

  In the air blower according to the second embodiment, the length D of the drain pipe 21 is set so that a water head larger than the pressure difference between the drain hole portion of the outlet portion 21a of the drain pipe 21 and the outside of the air blower can be generated. By adjusting, it is not necessary to store drain water in the outer casing 3, and drainage efficiency is improved. Also in the air blower according to the second embodiment, the drain pan 14 is fitted to the rail-like member 3e on the bottom surface 3d of the outer casing 3 as in the conventional structure, so that the assembling property and the maintenance workability are not deteriorated. .

  In the case where drain water is not generated, the air behind the ceiling flows into the outer casing 3 through the drain hole 10 and a problem may occur in that the amount of intake air from the space where the original intake air should be reduced decreases. However, since the area C of the drain hole of the outlet 21 a of the drain pipe 21 is smaller than the area B of the drain hole 10, the air resistance when the air behind the ceiling flows in becomes larger, and the inside of the outer casing 3 is increased. The amount of air behind the ceiling can be reduced.

Embodiment 3 FIG.
FIG. 5 is a cross-sectional view of the air blower according to Embodiment 3 of the present invention, and shows a cross section corresponding to line IV-IV in FIG. In the third embodiment, the drain pipe 21 is formed with a plurality of drain holes 21 b and 21 c having an area smaller than that of the drain hole 10.

  In the third embodiment, the air behind the ceiling flowing into the outer casing 3 through the drain hole 10 when drain water is not generated can be reduced as compared with the second embodiment.

FIG. 6 is a diagram illustrating another structure of the blower according to Embodiment 3. In FIG. The drain pipe 21 is formed with a plurality of drain holes 21b, 21c, 21d, 21e having an area smaller than that of the drain hole 10. The area of the drain hole 21b is C2, the area of the drain hole 21c is C3, and the area of the drain hole 21d is C4. The area of the drain hole 21e is C1. Drainage holes 21b, 21c, 21d, 21 e are provided in series. As shown in FIG. 6, by increasing the number of drain holes of the drain pipe 21, the effect of preventing the air behind the ceiling from flowing into the outer casing 3 through the drain hole 10 when drain water is not generated. Can be further enhanced. This effect is more effective as the difference between the area B of the drain hole 10 and the area of the drain hole having the largest area among the plurality of drain holes of the drain pipe 21 increases. Also in the air blower according to the third embodiment, the drain pan 14 is fitted with the rail-like member 3e on the bottom surface 3d of the outer casing 3 as in the conventional structure, so that the assembling property and the maintenance workability are not deteriorated. .

  The configuration described in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and can be combined with other 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 exhaust port, 2c tip, 3 outer casing, 3a outer casing suction port, 3b outer casing exhaust port, 3d bottom surface, 3e rail member, 4 impeller, 5 suction port, 6 discharge port, 7 Fan side air inlet, 8 Motor side air inlet, 9 Duct connection parts, 10 Drain hole, 10a connection part, 11 Blower body, 12 Duct, 13 Drain drain pipe, 14 Drain pan, 15 Drain drain port, 16 Corners, 16a , 16b, 16c region, 18 intake air passage, 19 normal air passage portion, 20 working fluid flow, 21 drain pipe, 21a outlet portion, 21b, 21c, 21d, 21e drainage hole, 22 centrifugal blower.

Claims (4)

A box having a suction port and a discharge port, a centrifugal blower housed in the box, and an intake air passage formed inside the box to connect the suction port and the suction port of the centrifugal blower An air blower that sucks air from the suction port by the centrifugal blower and generates an air flow that blows out from the discharge port,
The box includes a drain hole penetrating the bottom surface on the intake air passage,
The drain hole is provided at a corner of the box ,
The corner includes a point where an imaginary line extending in the direction of the axis of the centrifugal blower from the upstream end of the intake air passage of the centrifugal blower intersects the box, and an edge of the suction port of the box A line connecting the box and a region surrounded by the box, and a point where an imaginary line extending the axis of the centrifugal blower in the axial direction intersects the box and the inlet edge of the centrifugal blower and blower, characterized in area der Rukoto that are surrounded by the box body. Under the drain hole, having a drain pipe connected to the drain hole,
The blower according to claim 1 , wherein the drain pipe is provided with a drain hole having a smaller area than the drain hole.   A box having a suction port and a discharge port, a centrifugal blower housed in the box, and an intake air passage formed inside the box to connect the suction port and the suction port of the centrifugal blower An air blower that sucks air from the suction port by the centrifugal blower and generates an air flow that blows out from the discharge port,
  The box includes a drain hole penetrating the bottom surface on the intake air passage,
  The drain hole is provided at a corner of the box,
  Under the drain hole, having a drain pipe connected to the drain hole,
  The blower characterized in that the drain pipe is provided with a drain hole having a smaller area than the drain hole. The blower according to claim 2 or 3 , wherein the drain pipe is provided with a plurality of the drain holes in series.