JP7751869B2 - air blower - Google Patents

Description

The present invention relates to a blower device.

Ventilation equipment is used in store kitchens, factories, and office buildings where high-volume ventilation is required, and is generally installed by hanging it from the ceiling or attic of these facilities.

The blower's intake and exhaust ports are connected to the facility's duct, and the blower is configured to be located midway through the facility's exhaust equipment (between the exhaust air intake port of a kitchen hood, etc., and the exhaust port to the outdoors).

Generally, a blower device is known in which multiple blowers are arranged in parallel inside the body of the blower device (see, for example, Patent Document 1 below).

Patent No. 6463168

In such a blower device, multiple blowers must be arranged side by side within the machine, offset in position along a direction perpendicular to the machine's air intake, so that the blower motor can be maintained through a maintenance port located on the side of the machine. Placing large blowers in this way offset in the direction perpendicular results in a larger machine.

Furthermore, when multiple blowers are placed inside the machine, the intake flows from each blower may interfere with each other, creating flow resistance and reducing blowing performance. To reduce this flow resistance, it is preferable to ensure flow paths between each blower, between the blower and the machine's intake port, and between the blower and the machine's side wall, but this also leads to an increase in the machine's size.

Blower devices like this, with multiple blowers arranged inside, tend to make the entire unit larger due to maintenance constraints and the need to ensure internal flow paths.

On the other hand, some facilities, such as store kitchens, require small, high-volume air blowers, and there has been a demand for an air blower that can meet such requirements.

The present invention was invented to solve the above problems, and aims to provide a blower that suppresses a decline in blowing performance and is also compatible with miniaturization of the device body.

In order to achieve the above-mentioned object, the blower device of the present invention comprises a box-shaped body having a body inlet and a body outlet arranged opposite each other, and having a first wall portion where the body inlet is formed, a second wall portion where the body outlet is formed, a third wall portion, and a fourth wall portion arranged opposite the third wall portion, a first blower arranged inside the body, a second blower arranged inside the body and positioned so as to be offset toward the body outlet side relative to the first blower, a chamber portion connecting the outlet port of the first blower and the body outlet, a gap portion formed between the chamber portion and the top and/or bottom surface of the body, through which air can flow, and a flow path formed between the chamber portion and the side of the first blower opposite the second blower and the fourth wall portion, through which air can flow.

With the blower device configured as described above, a gap through which air can flow is formed between the chamber and the top and/or bottom surfaces of the device, reducing flow resistance toward the first and second blowers and reducing pressure loss. This makes it possible to provide a blower device that not only prevents a decline in blowing performance but also accommodates downsizing of the device.

1 is a schematic perspective view showing an air blower according to an embodiment of the present invention; 1 is a schematic plan view showing a blower device according to an embodiment of the present invention; FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. 2. 1 is a schematic front view of a blower device according to an embodiment of the present invention, viewed from the body inlet port side. FIG. 5 is a cross-sectional view taken along line 5-5 in FIG. 4. 1 is a schematic side view of a blower device according to an embodiment of the present invention as viewed from the maintenance opening side. FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. 6. 1 is a schematic rear view of a blower device according to an embodiment of the present invention, viewed from the body outlet side. FIG. 9 is a schematic cross-sectional view taken along line 9-9 in FIG. 8. FIG. 10 is a partially enlarged view of part A in FIG. 9 . FIG. 9 is a partially enlarged view of part B in FIG. 8 . FIG. 4 is a diagram illustrating a configuration of a guide portion. FIG. 10 is a schematic diagram corresponding to FIG. 7 of a blower device according to a second modification. FIG. 10 is a diagram showing air volume vectors on the lower surface of the chamber when a fluid analysis simulation of Example 1 is performed. FIG. 10 is a diagram showing air volume vectors on the upper surface of the chamber when a fluid analysis simulation of Example 1 is performed. FIG. 10 is a diagram showing air volume vectors on the lower surface of the chamber when a fluid analysis simulation of Example 2 is performed. FIG. 10 is a diagram showing air volume vectors on the upper surface of the chamber when a fluid analysis simulation of Example 2 is performed. FIG. 11 is a diagram showing air volume vectors on the lower surface of the chamber when a fluid analysis simulation of Example 3 is performed. FIG. 11 is a diagram showing air volume vectors on the upper surface of the chamber when a fluid analysis simulation of Example 3 is performed. FIG. 10 is a diagram showing air volume vectors on the lower surface of the chamber when a fluid analysis simulation of Comparative Example 1 is performed. FIG. 10 is a diagram showing air volume vectors on the upper surface of the chamber when a fluid analysis simulation of Comparative Example 1 is performed. FIG. 10 is a diagram showing air volume vectors on the lower surface of the chamber when a fluid analysis simulation is performed in Comparative Example 2. FIG. 10 is a diagram showing air volume vectors on the upper surface of the chamber when a fluid analysis simulation is performed in Comparative Example 2. FIG. 10 is a schematic diagram corresponding to FIG. 7 of a blower device according to a fourth modified example. FIG. 10 is a schematic diagram corresponding to FIG. 7 of a blower device according to a fifth modified example. FIG. 10 is a schematic diagram corresponding to FIG. 7 of a blower device according to a sixth modified example. 13 is a schematic diagram corresponding to FIG. 12 of a guide portion according to a modified example. FIG. 13 is a schematic diagram corresponding to FIG. 12 of a guide portion according to a modified example. FIG. 13 is a schematic diagram corresponding to FIG. 12 of a guide portion according to a modified example. FIG. 10A and 10B are schematic diagrams for explaining the configuration of a guide portion according to a modified example.

Embodiments of the present invention will be described below with reference to Figures 1 to 12. Note that in the description of the drawings, identical elements are given the same reference numerals, and duplicate explanations will be omitted. Also, the dimensional proportions in the drawings have been exaggerated for the sake of explanation, and may differ from the actual proportions.

FIG. 1 is a schematic perspective view of a blower device 1 according to an embodiment of the present invention. FIG. 2 is a schematic plan view of a blower device 1 according to this embodiment. FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. 2. FIG. 4 is a schematic front view of the blower device 1 according to this embodiment when viewed from the body inlet 11A side. FIG. 5 is a cross-sectional view taken along line 5-5 in FIG. 4. FIG. 6 is a schematic side view of the blower device 1 according to this embodiment when viewed from the maintenance port 13A side. FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. 6. FIG. 8 is a schematic rear view of the blower device 1 according to this embodiment when viewed from the body outlet 12A side. FIG. 9 is a cross-sectional view taken along line 9-9 in FIG. 8. FIG. 10 is a partial enlarged view of section A in FIG. 9. FIG. 11 is a partial enlarged view of section A in FIG. 8. FIG. 12 is a diagram for explaining the configuration of the induction section 70.

In the following description, the left-right direction when viewed from the body suction port 11A is referred to as the X direction, the direction perpendicular to the body suction port 11A (the depth direction of the blower 1) is referred to as the Y direction, and the vertical direction is referred to as the Z direction (see Figure 1).

As shown in Figures 1 to 11, the blower device 1 according to this embodiment comprises a box-shaped body 10, a first blower 20 arranged inside the body 10, a second blower 30 arranged inside the body 10, a chamber 40 arranged inside the body 10, a first gap 50 (corresponding to the gap) formed between the chamber 40 and the top surface (not shown) of the body 10, and a second gap 60 (corresponding to the gap) formed between the chamber 40 and the bottom surface 15 of the body 10.

As shown in Figures 1 to 3, the machine body 10 has a first wall portion 11 in which the machine body suction port 11A is formed, a second wall portion 12 in which the machine body discharge port 12A is formed, a third wall portion 13 in which the maintenance port 13A and the terminal block panel 13B are formed, a fourth wall portion 14 arranged opposite the third wall portion 13, a bottom surface 15 provided below the first wall portion 11, the second wall portion 12, the third wall portion 13, and the fourth wall portion 14, a drain panel 16 provided below the bottom surface 15 for collecting drain liquid, and a top surface (not shown) provided above the first wall portion 11, the second wall portion 12, the third wall portion 13, and the fourth wall portion 14.

The first wall portion 11 and the second wall portion 12 are arranged to face each other. The third wall portion 13 and the fourth wall portion 14 are arranged to face each other.

The bottom surface 15 of the machine body 10 is composed of a rectangular bottom panel, and as shown in Figure 2, a drain hole 15H is formed in the bottom surface 15. Condensed water and oil that form inside the machine body 10 are usually drained through the drain hole 15H to the drain panel 16. The drain panel 16 is configured to be at least large enough to collect the drain liquid that is discharged from the drain hole 15H.

Before explaining the detailed configuration of the blower device 1, we will explain the air flow within the blower device 1.

As shown in Figures 2 and 4, the casing plate 21B of the first blower 20 is connected and fixed to the first wall portion 11 in which the body suction port 11A is formed, and the first blower 20 is positioned so that it is in contact with the body suction port 11A.

On the other hand, the second blower 30 is connected and fixed to the second wall portion 12 in which the machine body outlet 12A is formed, and the second blower 30 is positioned so as to be in contact with the machine body outlet 12A.

Because the first fan 20 and the second fan 30 have the above-described configuration, air flowing into the blower device 1 from the body suction port 11A via the duct is split at the body suction port 11A and flows into flow path A and flow path B, as shown in Figures 2 and 4.

The air that flows into flow path B is further divided at the second fan 30, and as shown in Figure 2, is divided into flow paths B1 and B2, and is drawn in through the intake ports of the first fan 20 and second fan 30.

The air flowing through flow path B1 passes through the first gap 50 and the second gap 60 (sometimes referred to as gap flow) and flows to the left of the first fan 20 in the X direction.

Below, we define the first suction section 11M (aircraft suction port opening area S1) of the aircraft suction port 11A, which serves as the entrance to flow path A.

As shown in Figure 4, when viewed from the body suction port 11A side, the body suction port 11A has a first suction compartment 11M formed on the side opposite the motor of the first blower 20 (left side in Figure 4), and a second suction compartment 11N formed on the motor side (right side in Figure 4).

As shown in FIG. 4, the first suction compartment 11M is covered by the side surface 11L of the body suction port 11A opposite the second fan 30 side (left side in FIG. 4), and the side surface 21L of the casing plate 21B of the casing 21 of the first fan 20 opposite the second fan 30 side (left side in FIG. 4). The second suction compartment 11N is the area indicated by the two-dot chain line in FIG. 4. The area S1 of the first suction compartment 11M (body suction port opening area) is larger than half the opening area S2 of the exhaust port 23 of the first fan 20.

Generally, a larger body suction port opening area S1 is preferable to increase the amount of air taken in. However, unnecessarily increasing the body suction port opening area S1 leads to an increase in the size of the body. In the configuration of the present invention, by ensuring that the area S1 of the first suction section 11M (body suction port opening area) is at least half the opening area S2 of the exhaust port 23 of the first blower 20, the main suction volume can be supplemented by air flowing into the main suction port due to clearance flow, even when taking into account the opening ratio between the main suction port on the bellmouth 24 side (see Figure 5) and the auxiliary suction port on the motor 20M side, and the ratio of blade workload due to the position of the power transmission plate.

2 and 4 illustrate that air flowing through flow path B1 becomes a gap flow and flows to the left of the first fan 20 in the X direction. However, depending on the position of the fan within the airframe 10, a gap flow may occur to the right of the X direction from flow path A toward flow path B1. For example, in FIG. 2, this corresponds to a configuration in which the first fan 20 and chamber 40 are moved 85 mm toward the third wall 13 and positioned closer to the second fan 30. In this positional relationship, the bell mouth 34 side (left side of FIG. 2), which is the main suction port side of the second fan 30, cannot obtain sufficient suction volume. However, the generation of a gap flow to the right of the X direction from flow path A toward flow path B1 can compensate for the main suction volume of the second fan 30. Furthermore, by positioning the first fan 20 closer to the second fan 30, it is possible to reduce the width of the airframe in the X direction. This configuration allows for a more compact airframe 10 while suppressing a decrease in blowing performance. Furthermore, by positioning the first fan 20 closer to the maintenance opening 13A, it becomes easier to access the first fan 20, which also contributes to improved maintainability.

Next, the internal structure of the aircraft 10 will be explained with reference to Figures 1 to 7.

The first fan 20 is a double-suction fan. In the first fan 20, the bell mouth 24 side (left side in Figure 2) is the main suction port, and the bell mouth 25 on the motor 20M side (right side in Figure 2) is the sub-suction port.

As shown in Figures 5 and 7, the motor 20M and the blade portion of the sirocco fan 20F are connected by a power transmission plate 20S. As shown in Figure 7, the power transmission plate 20S is positioned closer to the motor 20M than the center of the blades, and separates the space inside the sirocco fan 20F into the motor 20M side (right side in Figure 2) and the bellmouth 24 side (left side in Figure 2). Because the blade area on the bellmouth 24 side (left side in Figure 2) is larger and there is no suction resistance member like the motor 20M, the bellmouth 24 side (left side in Figure 2), which has higher suction capacity, forms the main suction port, and the bellmouth 25 on the motor 20M side (right side in Figure 2) forms the sub-suction port. The second blower is also configured in a similar manner.

As shown in Figures 1 and 3, the casing 21 of the first blower 20 is positioned so as to be in contact with the body intake port 11A. As shown in Figure 1, the casing 21 is composed of a casing body 21A that houses the sirocco fan 20F, and casing plates 21B that are provided on both sides of the casing body 21A and connect the casing body 21A to the body 10 to secure the first blower 20 to the body 10. As shown in Figures 3 and 5, the casing body 21A is composed of casing side walls 28 that face each other on the left and right sides of the sirocco fan 20F, and a casing main plate 29 that is scroll-shaped and covers the outer periphery of the sirocco fan. The opening of the casing side walls 28 forms the bell mouth 24. The upper and lower surfaces of casing plate 21B are connected and fixed to the top and bottom surfaces 15 of the body 10, respectively, and one side of casing plate 21B is connected and fixed to the body suction port 11A. This connected and fixed state constitutes one mode in which the casing 21 of first blower 20 is arranged close to the body suction port 11A. Note that in this close-arrangement mode, if casing plate 21B is not present, a space is formed between the casing main plate 29 and the top and bottom surfaces of the body 10. If casing plate 21B is not present, air would also flow into the body through this space.

By driving the motor 20M of the first blower 20, air is drawn in through the machine body inlet 11A, and then from both sides of the first blower 20 in the X direction. The air discharged from the exhaust port 23 of the first blower 20 then moves to the chamber 40, travels within the chamber 40, and is then discharged from the machine body outlet 12A of the machine body 10.

The motor 20M of the first blower 20 can be removed and replaced through the maintenance opening 13A in the third wall portion 13, as shown in Figure 1.

The second fan 30 is a double-intake fan. In the second fan 30, the bell mouth 34 side (left side in Figure 2) is the main inlet, and the bell mouth 35 on the motor 30M side (right side in Figure 2) is the sub-inlet. The configuration of the second fan 30 is substantially the same as the configuration of the first fan 20, so a detailed description will be omitted.

By driving the motor 30M of the second fan 30, air is drawn in through the air intake 11A and from both sides of the second fan 30 in the X direction. The air discharged from the exhaust port 33 of the second fan 30 is then expelled from the air outlet 12A of the airframe 10.

The motor 30M of the second blower 30 can be removed and replaced through the maintenance opening 13A in the third wall portion 13, as shown in Figure 1.

The chamber section 40 is disposed inside the body 10. As shown in FIG. 2, the chamber section 40 is disposed on the body outlet 12A side of the first blower 20, and closer to the fourth wall section 14 than the second blower 30. The inlet 40A of the chamber section 40 is connected to the exhaust port of the first blower 20, and the outlet of the chamber section 40 is connected to the body outlet 12A of the second wall section 12 of the body 10.

The chamber section 40 forms a flow path through which air discharged from the exhaust port 23 of the first blower 20 reaches the machine body discharge port 12A.

As shown in FIG. 2, the chamber section 40 is configured so that the flow path area gradually increases from the exhaust port 23 of the first blower 20 toward the body discharge port 12A. For example, if the flow path area suddenly increases or decreases from the exhaust port 23 of the first blower 20 toward the body discharge port 12A, this would undesirably increase pressure loss in the chamber section. In contrast, the chamber section 40 of the blower device 1 according to this embodiment is configured so that the flow path area gradually increases from the exhaust port 23 of the first blower 20 toward the body discharge port 12A, thereby reducing pressure loss in the chamber section 40.

As shown in Figure 2, the chamber section 40 has an inclined section 41 located on the right side in the X direction and inclined toward the second blower 30 (right side in the X direction) from the exhaust port 23 of the first blower 20 to the body discharge port 12A, and a straight section 42 located on the left side in the X direction and extending along the Y direction.

The inclination angle of the inclined portion 41 relative to the Y direction is not particularly limited, but is preferably between 10 and 40 degrees, and more preferably between 20 and 25 degrees. By providing the inclined portion 41 in this manner, the flow of air toward the main intake port on the bell mouth 34 side of the second blower 30 can be rectified, suppressing turbulence within the airframe 10. This more effectively prevents a decrease in blowing performance. Note that the above preferred angle can be set appropriately within this range even when the straight portion 42 is inclined relative to the Y direction.

As shown in Figures 2 and 3, the inlet 40A of the chamber section 40 has approximately the same flow path area and shape as the outlet 23 of the first blower 20. This reduces pressure loss at the boundary between the inlet 40A of the chamber section 40 and the outlet 23 of the first blower 20.

For example, if the straight section 42 were not parallel to the Y direction but were tilted to the left in the X direction as it moved in the positive direction of the Y direction, the left side of the chamber section 40 in the X direction would be blocked, preventing effective flow of gap air from the first gap section 50 and the second gap section 60. In contrast, the straight section 42 of the blower device 1 according to this embodiment is arranged parallel to the Y direction, so the left side of the chamber section 40 is not blocked and gap air from the first gap section 50 and the second gap section 60 can be effectively passed.

As shown in Figures 1 and 3, the chamber portion 40 has an upper surface 43 and a bottom surface 44. A first gap portion 50 is formed between the upper surface 43 of the chamber portion 40 and the top surface of the body 10. Furthermore, a second gap portion 60 is formed between the bottom surface 44 of the chamber portion 40 and the bottom surface 15 of the body 10.

As shown in FIG. 7, the first gap 50 is formed at least closer to the body outlet 12A than the opening edge 30E of the suction port of the second blower 30 on the body outlet 12A side. Also, as shown in FIG. 7, the second gap 60 is formed at least closer to the body outlet 12A than the opening edge 30E of the suction port of the second blower 30 on the body outlet 12A side. With this configuration, the first gap 50 and the second gap 60 are formed in an area where the second blower 30 has little suction, thereby effectively forming a gap flow.

Next, the configuration of the aircraft 10 will be described in more detail with reference to Figures 8 to 11.

The first wall portion 11 of the body 10, where the body inlet 11A is provided, has a first panel (not shown) and a second panel (not shown). Furthermore, the second wall portion 12 of the body 10, where the body outlet 12A is provided, has a first panel 12B and a second panel 12C, as shown in Figures 8 to 11.

Here, the first panel of the first wall portion 11 and the first panel 12B of the second wall portion 12, as well as the second panel of the first wall portion 11 and the second panel 12C of the second wall portion 12, have substantially the same configuration, so below we will explain the configuration of the first panel 12B and the second panel 12C of the second wall portion 12 as representatives.

As shown in Figure 10, the second panel 12C is adjacent to the first panel 12B on the outer side in the Y direction. The second panel 12C is formed contiguous with the bottom surface 15. In other words, a flange portion (corresponding to the second panel 12C) rising in the Z direction is connected to the end surface of the bottom surface 15, and this flange portion and the bottom surface 15 form a shallow, box-shaped body bottom plate. The first to fourth walls 11 to 14, which have the first panel 12B, are arranged so as to contact the inside of the flange portion of the bottom surface 15 of the body 10, and the walls 11 to 14 are fixed to the top panel above to form the body 10 of the blower device 1.

As shown in Figures 8 and 10, the first panel 12B and the second panel 12C are connected to the drain panel 16 by a connection portion 80. Here, as shown in Figures 2 and 4, the length of the drain panel in the Y direction is longer than the bottom surface 15, and it protrudes outward by a certain width in a plan view. On the other hand, the width of the drain panel 16 in the X direction is shorter than the bottom surface 15.

The connection portion 80 is not particularly limited, but is composed of an L-shaped member 80a with a generally L-shaped cross section that extends from the drain panel 16. One side of the L-shaped member 80a has the same length as the protruding width of the drain panel 16, and the other side is connected to the first panel 12B and the second panel 12C with screws. Through this connection portion 80, the drain panel 16 and the aircraft body 10 are connected in a state where they protrude outward a predetermined width.

As shown in Figures 8, 10, and 11, the second panel 12C has a guide section 70 that guides drainage liquid flowing down from the duct connection port 17 of the aircraft body 10 to the drain panel 16. Note that the second panel 12C on which the guide section 70 is formed is part of the bottom plate of the aircraft body 10, and is not a separate component provided for guiding drainage liquid. Therefore, by forming the guide section 70 in an existing component, it is possible to effectively utilize the existing component and reduce component costs.

In this embodiment, as shown in FIG. 11, the guide portion 70 is a recess formed in a concave shape in the reference surface 12S of the second panel 12C. Here, the reference surface 12S of the second panel 12C is a plane along the X direction on the top surface of the second panel 12C where the guide portion 70 does not exist.

As shown in Figures 8 and 10, the induction section 70 is provided vertically below the duct connection port 17 on the second wall section 12 (corresponding to the side surface on which the duct connection port 17 is provided).

As shown in FIG. 8, when viewed from the duct connection port 17 side, at least a portion of the guide section 70 is formed in an area more inward than the end of the drain panel 16. Furthermore, as shown in FIG. 11, when viewed from the duct connection port 17 side, at least a portion of the guide section 70 is provided more outward than the drain liquid outflow point P at the duct connection port 17. This configuration allows the drain liquid to be efficiently collected in the drain panel 16.

In this specification, the drain liquid outflow point P is defined as the point where the drain liquid leaking from the duct connection port 17 first comes into contact with the first panel 12B.

As shown in Figures 11 and 12, the guide portion 70 has a first end 71 and a second end 72 that begin to move away from the reference surface 12S of the second panel 12C in the Z direction.

As shown in FIG. 11, the drain liquid outflow point P is located between the first end 71 and the second end 72 in the X direction. As shown in FIG. 12, the guide section 70 has a first inclined portion 73 that is located below the first end 71 in the Z direction and inclined inward in the X direction, a second inclined portion 74 that is located below the second end 72 in the Z direction and inclined inward in the X direction, and a straight portion 75 that connects the first inclined portion 73 and the second inclined portion 74 along the X direction. That is, in this embodiment, the guide section 70 has a trapezoidal shape that is narrower at the bottom in the Z direction than at the top.

As such, the guide section 70 includes the first inclined section 73, allowing the drain liquid to flow along the first inclined section 73 and be efficiently collected in the drain panel 16.

For example, if the guide section 70 were not provided, the drain liquid flowing out from the outflow point P would flow along the second panel 12C toward the outside of the aircraft 10. In contrast, by providing the guide section 70, the guide section 70 can stop the liquid from flowing outward in the X direction and guide it toward the drain panel 16. Furthermore, the first inclined section 73 makes it easier for droplets to form in the direction of gravity, allowing the drain liquid to fall appropriately onto the drain panel 16.

As shown in Figure 8, when the first panel 12B, second panel 12C, and drain panel 16 are connected by the connection portion 80, the connection portion 80 is positioned below the second end portion 72 and inside the lowest point of the first inclined portion 73. With this configuration, drain liquid does not drip onto the connection portion 80, preventing deterioration of the connection portion 80.

As shown in Figures 2 and 10, the drain panel 16 has an opening 16H that protrudes outward in the Y direction beyond the second panel 12C in a plan view. With this configuration, drain liquid dripping from the guide section 70 can be collected through the opening 16H, allowing for efficient collection of drain liquid.

As described above, the blower device 1 according to this embodiment includes a box-shaped body 10 having a body inlet 11A and a body outlet 12A arranged opposite each other, a first blower 20 disposed inside the body 10, a second blower 30 disposed inside the body 10 and positioned offset toward the body outlet 12A relative to the first blower 20, a chamber 40 connecting the exhaust port 23 of the first blower 20 and the body outlet 12A, and gaps 50, 60 formed between the chamber 40 and the top and/or bottom surface 15 of the body 10, allowing air to flow. With the blower device 1 configured in this manner, the gaps 50, 60 allowing air to flow are formed between the chamber 40 and the top and/or bottom surface 15 of the body 10, reducing flow resistance toward the first blower 20 and the second blower 30 and reducing pressure loss. This makes it possible to provide a blower device 1 that suppresses deterioration in blowing performance and is also compatible with downsizing of the body 10.

The chamber section 40 also forms a flow path through which air discharged from the exhaust port 23 of the first blower 20 reaches the body discharge port 12A, and the flow path area of the chamber section 40 gradually increases from the exhaust port 23 of the first blower 20 toward the body discharge port 12A. With the blower device 1 configured in this way, the flow path area gradually increases from the exhaust port 23 of the first blower 20 toward the body discharge port 12A, thereby reducing pressure loss in the chamber section 40.

The chamber section 40 also has an inclined section 41 that slopes from the exhaust port 23 of the first blower 20 to the body discharge port 12A toward the second blower 30. With a blower device 1 configured in this manner, the air flow toward the main intake port on the bell mouth 34 side of the second blower 30 can be rectified, suppressing turbulence within the body 10. This makes it possible to more effectively suppress a decline in blowing performance.

In addition, the side of the chamber 40 opposite the second blower 30 is formed so as to be parallel to the perpendicular direction (Y direction) perpendicular to the body suction port 11A. With the blower device 1 configured in this way, the left side of the chamber 40 is not blocked, allowing gap flows from the first gap 50 and the second gap 60 to flow effectively.

The first blower 20 is a double-intake blower, with the casing 21 of the first blower 20 positioned adjacent to the body inlet 11A. When viewed from the body inlet 11A side, the body inlet 11A has a first inlet compartment 11M formed on the side opposite the motor of the first blower 20 and a second inlet compartment 11N formed on the motor side. The area S1 of the first inlet compartment 11M (body inlet opening area) is larger than half the opening area of the exhaust outlet 23 of the first blower 20. With the blower device 1 configured in this manner, even when taking into account the opening ratio between the main inlet on the bellmouth 24 side (see Figure 5) and the auxiliary inlet on the motor 20M side, and the ratio of blade workload due to the position of the power transmission plate, the main suction volume can be supplemented by air flowing into the main inlet due to clearance flow.

In addition, in a plan view, the gaps 50, 60 are formed at least closer to the body outlet 12A than the opening edge 30E of the suction port of the second blower 30 on the body outlet 12A side. With the blower device 1 configured in this manner, the first gap 50 and the second gap 60 are formed in an area where the suction of the second blower 30 is minimal, making it possible to effectively form gap flow.

Next, we will explain a modified example of the air blower 1 according to the above-described embodiment.

<Modification 1>
In the above-described embodiment, the blower 1 has the first gap 50 and the second gap 60. However, the blower according to the first modification may have a configuration that does not have the first gap 50 and the second gap 60. The other configurations are the same as those of the blower 1 according to the embodiment. With this configuration, the chamber 40 forms a flow path through which air discharged from the outlet 23 of the first blower 20 reaches the body outlet 12A, and the flow path area of the chamber 40 gradually increases from the outlet 23 of the first blower 20 toward the body outlet 12A, thereby suppressing a decrease in blowing performance and enabling the body 10 to be made smaller.

<Modification 2>
As shown in FIG. 13 , the right side of the chamber 240 of the blower device 2 according to Modification 2 is linearly configured along the Y direction. Also, as shown in FIG. 13 , the blower device 2 according to Modification 2 includes a guide member 90 arranged on the side of the chamber 240 facing the second blower 30 (the right side in the X direction) in a plan view. Similar to the inclined portion 41 of the blower device 1 according to the embodiment, the guide member 90 has a guide gap through which air flows between the top and bottom surfaces 15 of the body 10. The guide member 90 slopes from the exhaust port 23 of the first blower 20 toward the body outlet 12A toward the second blower 30 (the right side). By providing the guide member 90 in this manner, it is possible to rectify the air flowing toward the bell mouth 34 (the left side in FIG. 2 ), which is the main intake port side of the second blower 30, thereby suppressing turbulence within the body 10. This improves blowing performance.

<Simulation>
A fluid analysis simulation was carried out to examine the blowing performance of the blower according to the present invention. The results of the analysis will be described below.

Simulations were performed by substituting the following fan curve values for the internal fan conditions of the first fan 20 and the second fan 30: air volume 0 m ³ /h at static pressure 850 Pa, air volume 2000 ^{m 3 /} h at static pressure 700 Pa, air volume 3000 m ³ /h at static pressure 460 Pa, air volume 3500 ^{m 3} /h at static pressure 300 Pa, and air volume 4200 m 3 /h at static pressure 0 Pa for the first fan 20 and the second fan 30, respectively.

The following six items were measured. Referring to Figure 2, <item 1> was the left-side suction air volume in the X direction of the first fan 20 (air volume flowing into bellmouth 24), <item 2> was the right-side suction air volume in the X direction of the first fan 20 (air volume flowing into bellmouth 25), <item 3> was the left-side suction air volume in the X direction of the second fan 30 (air volume flowing into bellmouth 34), <item 4> was the right-side suction air volume in the X direction of the second fan 30 (air volume flowing into bellmouth 35), <item 5> was the volumetric flow rate, and <item 6> was the inlet/outlet pressure difference.

In items 1 to 4, the air volume flowing into the bellmouths 24, 25, 34, and 35 of the first fan 20 and second fan 30 was calculated.

In <Item 5>, the volume of fluid (air) flowing per unit time at the outlet of the blower 1 was measured. The higher the volumetric flow rate, the greater the amount of air that can be moved, indicating higher blowing performance.

In <Item 6>, the inlet/outlet pressure difference was calculated. The lower the pressure difference, the less pressure loss there is within the blower, meaning higher blower performance.

Fluid analysis simulations were performed on the following five examples or comparative examples.

Example 1
A fluid analysis simulation was performed by modeling the configuration of the blower 1 according to the above-described embodiment. The model is shown in Figures 14 and 15. In this model, gaps 50 and 60 and an inclined portion 41 are formed.

Example 2
A fluid analysis simulation was performed by modeling the configuration of the blower according to the above-described modified example 1. The model is shown in Figures 16 and 17. In this model, there are no gaps 50, 60 and an inclined portion 41 is formed.

Example 3
A fluid analysis simulation was performed by modeling a configuration to verify the effect of the guide member. The model is shown in Figures 18 and 19. A guide member 90 is formed without gaps 50 and 60. The chamber has a straight shape with no inclined portions.

<Comparative Example 1>
A fluid analysis simulation was performed on a blower according to Comparative Example 1, which did not have the first gap 50 or the second gap 60, did not have the guide member 90, and had a straight right wall of the chamber. The model is shown in Figures 20 and 21.

<Comparative Example 2>
A fluid analysis simulation was performed by modeling a configuration in which the left side of the first fan 20 is closed. The model is shown in Figures 22 and 23.

Table 1 shows the results of the fluid analysis simulation. Figures 14 to 23 show the airflow vectors on the upper and lower surfaces of the chamber when fluid analysis simulations were performed for Examples 1 to 3 and Comparative Examples 1 and 2.

Here, we will consider the results of the fluid analysis simulation. First, we will consider "Example 1" and "Example 2." The structural difference between "Example 1" and "Example 2" is the presence or absence of gaps 50 and 60.

Comparing "Example 1" and "Example 2,""Example1" had a higher volumetric flow rate by 36.79 m ³ /h, and the "left-side airflow of the first fan" and "right-side airflow of the first fan" were 74.74 ^{m 3} /h and 48.17 ^{m 3} /h higher, respectively. Furthermore, looking at the airflow vectors in "Example 1," as shown in Figures 14 and 15, it can be seen that air flows from the left-side air duct of the second fan 30 → the gap → the left-side air duct of the first fan 20 → the left-side intake port of the first fan. This gap flow increases the workload of the first fan. Furthermore, the flow velocity in the negative direction is faster at the edge of the gap on the outlet side of the fan intake port of the second fan than at the edge on the outlet side of the fan body. Therefore, forming a gap in this area can achieve a high flow path effect.

Furthermore, when comparing "Example 1" and "Comparative Example 2", "Example 1" has a higher volumetric flow rate by 53.13 m ³ /h. Furthermore, the "first fan left side airflow rate" and "first fan right side airflow rate" are 89.98 ^{m 3} /h and 57.93 ^{m 3} /h, respectively, with "Example 1" having higher airflow rates. In "Comparative Example 2", it is thought that the first fan cannot perform sufficient work due to the lack of air circulation through the gap.

Next, comparing "Example 2" and "Comparative Example 1", "Example 2" has a higher volumetric flow rate of 62.95 m ³ /h. The structural difference between "Example 2" and "Comparative Example 1" is the inclined chamber portion, and it can be seen that the gradual expansion of the chamber portion improves the air blowing performance.

Next, comparing "Example 3" with "Comparative Example 1", "Example 3" has a higher volumetric flow rate by 77.94 ^{m 3} /h. The guide member improves the airflow performance. Furthermore, the "second fan left side airflow" and "second fan right side airflow" are 26.67 ^{m 3} /h and 17.05 ^{m 3} /h, respectively, in "Example 3", which are higher in volumetric flow. Referring to Figures 18 to 21, a comparison of airflow vectors also confirms that in "Example 3", the air flow heading towards the "second fan left side inlet" is rectified.

The configuration of the air blower according to the present invention has been described above through embodiments and modifications, but the present invention is not limited to the above-described embodiments and modifications, and various modifications are possible within the scope of the claims.

For example, in the above-described embodiment, the blower device 1 has a first gap 50 and a second gap 60. However, the blower device may be configured to have either the first gap 50 or the second gap 60.

Furthermore, in the above-described embodiment, the flow path area of the chamber section gradually increases from the exhaust port of the first blower 20 toward the body discharge port 12A, but the flow path area may also be configured to be constant.

In addition, in the above-described embodiment, the side of the chamber portion opposite the second blower 30 side was formed to be parallel to the Y direction, but it may also be configured to be inclined relative to the Y direction.

In the above-described embodiment, the first blower 20 was provided with a casing plate 21B, but as shown in Figure 24, the first blower 20 does not need to be provided with a casing plate 21B. In this configuration, when viewed from the fuselage suction port 11A side, the first suction section 11M is the area covered by the side surface 11L of the fuselage suction port 11A opposite the second blower 30 side (left side in Figure 4), and the side surface 21L of the casing plate 21B of the casing 21 of the first blower 20 opposite the second blower 30 side (left side in Figure 4). The area of the first suction compartment 11M in this modified example can be reduced to approximately 90% of the area of the first suction compartment 11M in the embodiment, because spaces for air flow are formed between the casing main plate 29 and the top and bottom surfaces of the fuselage 10. If the area is 90% or more, the main suction volume can be supplemented by air flowing into the main suction port due to clearance flow, even when taking into account the opening ratio between the main suction port on the bellmouth 24 side (see Figure 5) and the sub-suction port on the motor 20M side, and the proportion of blade work due to the position of the power transmission plate.

In the above-described embodiment, the casing 21 of the first blower 20 is positioned so as to be in contact with the body inlet 11A. However, as shown in FIG. 25, the casing 21 of the first blower 20 does not necessarily need to be in contact with the body inlet 11A as long as it is close to the body inlet 11A. In the configuration in which the gap flow described in the above-described embodiment occurs, the positional relationship between the casing 21 of the first blower 20 and the body inlet 11A shown in FIG. 25 is one embodiment in which they are positioned in close proximity. In this configuration, the first suction compartment 11M is defined by the side surface 11L of the body inlet 11A opposite the second blower 30 side (left side in FIG. 4), the left side surface of the casing plate 21B in FIG. 25, the top surface of the body, and the bottom surface of the body, as shown in FIG. 25. That is, in the embodiment of FIG. 25, the first suction compartment 11M is the area defined by the body components, not the direction in which the body is viewed. More specifically, it is an area defined by lines connecting a first point where an imaginary line extending in the Z direction from the side 11L on the opposite side of the body suction port 11A from the second blower 30 side (left side in Figure 4) meets the top surface of the body, a second point where the imaginary line meets the bottom surface of the body, a third point where the end of the side of the casing plate 21B on the left side in Figure 25 closest to the body suction port meets the top surface of the body, and a fourth point where the end of the side of the casing plate 21B on the left side in Figure 25 closest to the body suction port meets the bottom surface of the body. The lengths of the lines connecting the first point and the third point and the lines connecting the second point and the fourth point, i.e., the distance between the side 11L of the body inlet 11A opposite the second blower 30 side (left side in Figure 4) and the end of the casing plate 21B on the left side in Figure 25 closest to the body inlet, vary depending on the proximity between the body inlet 11A and the casing 21 of the first blower 20. The length of the line connecting the first and third points (the line connecting the second and fourth points) that varies can be calculated geometrically from the length of the line connecting the first and third points (the line connecting the second and fourth points) when the casing 21 of the first blower 20 is positioned so as to be tangent to the airframe air inlet 11A, and the distance from the third point (the fourth point) to the airframe air inlet 11A when the casing 21 of the first blower 20 is positioned close to the airframe air inlet 11A, i.e., the proximity distance. In the modified example shown in Figure 25, the length of the line connecting the first and third points (the line connecting the second and fourth points) that varies in this manner can be calculated, and the area S1 of the first air inlet section 11M (the airframe air inlet opening area) can be calculated. Even with this configuration, by ensuring that the area S1 of the first suction section 11M (machine suction port opening area) is at least half the opening area S2 of the exhaust port 23 of the first blower 20, the main suction volume can be supplemented by air flowing into the main suction port due to clearance flow, even when taking into account the opening ratio between the main suction port on the bellmouth 24 side (see Figure 5) and the sub-suction port on the motor 20M side, and the proportion of blade work due to the position of the power transmission plate.

In the above-described embodiment, the first fan 20 is arranged along the Y direction. However, the first fan 20 may be arranged at an angle to the Y direction, as shown in FIG. 26. In this configuration, the first suction section 11M, when viewed from the body suction port 11A side, is the area covered by the side surface 11L of the body suction port 11A opposite the second fan 30 side (left side in FIG. 4), and the side surface 21L of the casing plate 21B of the casing 21 of the first fan 20 opposite the second fan 30 side (left side in FIG. 4). Even with this configuration, by ensuring that the area S1 of the first suction section 11M (machine suction port opening area) is at least half the opening area S2 of the exhaust port 23 of the first blower 20, the main suction volume can be supplemented by air flowing into the main suction port due to clearance flow, even when taking into account the opening ratio between the main suction port on the bellmouth 24 side (see Figure 5) and the sub-suction port on the motor 20M side, and the proportion of blade work due to the position of the power transmission plate.

In the above-described embodiment, the guide portion 70 has a trapezoidal shape with a narrower bottom. However, the guide portion 170 may have a triangular shape with a vertex at the bottom, as shown in FIG. 27. Furthermore, the guide portion 270 may be formed as a convex portion that is formed in a convex shape from the reference surface 12S of the second panel 12C, as shown in FIG. 28. Furthermore, the guide portion 370 may be configured to include the guide portion 170 and the guide portion 270, as shown in FIG. 29.

Furthermore, the shape of the guide portion is not limited to the triangular or trapezoidal shapes described above, but may also be circular, elliptical, right-angled triangular, cone-shaped, etc.

Furthermore, in the above-described embodiment, the entire guide portion 70 is positioned inside the drain panel 16 in the X direction, but part of the guide portion may be positioned outside the drain panel 16 in the X direction.

In addition, in the above-described embodiment, as shown in FIG. 8, when the first panel 12B, the second panel 12C, and the drain panel 16 are connected by the connection portion 80, the connection portion 80 is positioned below the first end 71 and inside the lowest point of the first inclined portion 73. However, as shown in FIG. 30, when the first panel 12B, the second panel 12C, and the drain panel 16 are connected by the connection portion 80, the connection portion 80 may be positioned below the first end 71 and outside the lowest point of the first inclined portion 73. Even with this configuration, drain liquid does not drip onto the connection portion 80, preventing deterioration of the connection portion 80.

1, 2, 3 Blower,
10 aircraft,
11A Aircraft intake,
12A Machine outlet,
12B First Panel,
12C second panel,
12S reference plane,
15 bottom surface,
16 drain panel,
16H opening,
17 duct connection port,
20 first blower,
20M motor,
21 casing,
23 outlet,
30 second blower,
30E opening edge,
30M motor,
31 casing,
33 outlet,
40, 240 chamber part,
41 Slope part,
42 straight section,
50 first gap portion (gap portion),
60 second gap portion (gap portion),
70, 170, 270, 370 guiding part,
71 first end;
72 second end;
73 first slope part,
74 second slope part,
80 connection part,
90 guide member,
P Outflow point.

Claims (7)

a box-shaped body having a body inlet and a body outlet provided opposite to each other, the box-shaped body including a first wall portion in which the body inlet is formed, a second wall portion in which the body outlet is formed, a third wall portion, and a fourth wall portion disposed opposite to the third wall portion;
a first fan disposed inside the fuselage;
a second fan disposed inside the machine body and positioned toward the machine body outlet side relative to the first fan;
a chamber portion connecting an outlet of the first blower and the body outlet;
A gap formed between the chamber and the top and/or bottom surface of the body, allowing air to flow;
a flow path formed between the chamber portion , a side of the first fan opposite the second fan, and the fourth wall portion, through which air can flow; the chamber portion forms a flow path through which the air discharged from the outlet of the first blower reaches the body outlet,
The blower device according to claim 1 , wherein the chamber portion has a flow path area that gradually increases from the outlet of the first blower toward the body outlet. The blower device according to claim 2, wherein the chamber portion has an inclined portion that slopes from the exhaust port of the first blower to the body discharge port toward the second blower. a guide member disposed on a side surface of the chamber portion facing the second fan in a plan view;
The blower device according to any one of claims 1 to 3, wherein the guide member has a guide gap portion through which the air flows between the top surface and/or the bottom surface of the body, and is inclined from the exhaust port of the first blower to the body discharge port toward the second blower. The blower device according to any one of claims 1 to 4, wherein the side of the chamber portion opposite the second blower is formed so as to be parallel to a direction perpendicular to the body intake port. the first fan is a double-inlet fan including a casing shell that houses a fan, casing side walls that have a main suction port and a sub-suction port and are disposed on both sides of the fan, and a motor that is disposed on the sub-suction port side of the casing side walls,
a casing of the first fan is disposed adjacent to the airframe intake port,
When viewed from the aircraft intake side,
The airframe suction port has a first suction compartment formed on a side opposite to the motor of the first fan and a second suction compartment formed on a side closer to the motor,
The blower device according to any one of claims 1 to 5, wherein an area of the first suction section is larger than half an opening area of the outlet of the first blower. The blower device according to any one of claims 1 to 6, wherein, in a plan view, the gap is formed at least closer to the outlet of the second blower than the edge of the intake port of the second blower on the outlet side of the blower.