JP6948533B2 - Air curtain device - Google Patents

Description

The present invention relates to an air curtain device installed at an entrance / exit of a food store or a restaurant and shuts off the outside air by a curtain-like air flow.

Conventionally, an air curtain device blocks the outside air by a curtain-like air flow, which makes it difficult for the cold air and heat of the room to escape, and blocks the intrusion of dust from the outside. Therefore, a grocery store or a restaurant It is used at the entrance and exit of.

The structure of the conventional air curtain device is shown in FIGS. 6 and 7. Here, FIG. 6 is a schematic view of a side cross section, and FIG. 7 is a schematic perspective view.

The air curtain device shown in FIG. 6 has an electric motor 101 and a once-through fan 102. The main body is fixed by attaching the back panel 105 provided on the back side of the main body to the mounting plate 104 provided on the wall surface 103. The once-through fan 102 is provided between the rear guider 106 and the stabilizer 107 that form the air passage. A suction panel 108 is provided on the front side of the main body, and is fixed by an outer shell panel 109 that constitutes the outer shell of the main body. As shown in FIG. 7, the suction panel 108 is provided with a large number of suction ports 110. When the electric motor 101 is operated, the once-through fan 102 rotates in the direction of rotation 111, the suction airflow 112 flows in from the suction port 110 provided in the suction panel 108, flows along the rear guider 106 and the stabilizer 107, and the curtain. The airflow becomes 113 and is sent out from the outlet 114 provided on the lower surface side of the main body.

With the above configuration, the angle between the suction port 110 and the outlet 114 is brought closer to 90 ° around the rotation axis of the once-through fan 102, and the fan efficiency of the once-through fan 102 is improved. (See, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 5-31372

In such a conventional air curtain device, the fan efficiency of the once-through fan is high, but there is a problem that dust and the like are accumulated on the suction port due to long-term use and dirt is conspicuous. In addition, in order to hide the suction port, simply changing the position of the suction port to the upper surface of the product will make the angle of the blowout airflow larger than 90 ° with respect to the suction airflow, which will reduce the fan efficiency. There was a challenge.

That is, in order to increase the fan efficiency of the once-through fan, it is preferable to set the blowout airflow to 90 ° or less with respect to the suction airflow. However, when a suction port is provided on the upper surface, an air passage must be formed so as to blow out to the front side like an air conditioner, but for an air curtain device that requires a function of blowing out air directly below. Was a big issue unlike the air conditioner.

The present invention solves such a conventional problem, and provides an air curtain device that suppresses a decrease in fan efficiency while providing a suction port on the upper surface so that dirt on the suction port is not conspicuous even during long-term use. The purpose is to do.

In order to achieve the above object, the air curtain device of the present invention has a housing constituting the outer shell, a suction port for taking in air inside the outer shell, an air outlet for blowing air to the outside of the outer shell, and the blowout from the suction port. An air curtain device including a fan that guides air to an outlet, the suction port provided on the upper surface of the outer shell, the air outlet provided horizontally on the lower surface of the outer shell, and both sides of the housing. The air passage includes a once-through fan as the fan that rotates about a central axis provided perpendicular to the surface and an air passage structure provided in the air passage on the outlet side of the once-through fan. The structure has a convex portion protruding toward the back side from the central axis and a concave portion located on the front side of the convex portion on the front side of the air passage structure, and the convex portion and the concave portion flow through the convex portion and the concave portion. a tongue which is formed by providing over the end of the fan, e Bei and a front vertical wall provided vertically downward from the lower end of the recess, the upper and lower from the upper end of the recess to the front vertical wall lower end The range and the left and right ranges at both ends of the once-through fan are defined as the front wall A, and the front wall A is an air curtain device or the like arranged on the front side of the central axis, thereby achieving the intended purpose. Is.

According to the present invention, even when the suction port is provided on the top surface side of the product, it is possible to suppress a decrease in fan efficiency, and it is possible to provide an air curtain device having a higher blocking effect.

Perspective view of the air curtain device according to the present invention Side sectional view of the air curtain device according to the present invention Enlarged cross section near the air outlet Enlarged sectional view of the air passage structure Side sectional view for explaining the air passage structure Schematic of the side cross section of a conventional air curtain device Schematic perspective of a conventional air curtain device

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings for the purpose of understanding the present invention. The following embodiments are examples that embody the present invention, and do not limit the technical scope of the present invention. In addition, the same parts are designated by the same reference numerals throughout the drawings, and the second and subsequent explanations are omitted.

First, a schematic configuration of the air curtain according to the present invention will be described with reference to FIG. FIG. 1 is a perspective view of the air curtain device 1 according to the present invention.

As shown in FIG. 1, the air curtain device 1 is installed on the wall surface 12, and includes an outer shell 2, a motor 40, a suction port 3, an air outlet 4, a fan 5, and an air passage structure 6. There is.

The outer shell 2 has a housing 7 for protecting the built-in parts from the outside, a back panel 8 for installing the air curtain device 1 on the wall surface 12, and a blower for filling the gap between the outer shell 2 and the air outlet 4. It is provided with an exit panel 9.

The motor 40 is arranged at the center of the outer shell 2 in the left-right direction, and power is supplied through the power cord. The motor 40 is a dual-axis motor having shafts on both sides, and a fan 5 is connected to the left and right shafts.

When the power is turned on to the motor 40, the fan 5 rotates, air flows into the outer shell 2 from the suction port 3, passes through the inside of the air passage structure 6, and air is directly below the air outlet 4 to the outside. Is a structure that sends out.

Next, the schematic configuration of the air curtain device according to the present invention will be described in detail with reference to FIG. Note that FIG. 2 is a side sectional view with respect to the AA cross section shown in FIG. 1, which is the same cross section across both ends of the fan 5.

The housing 7 is molded of ABS resin and has a box shape that covers the upper surface, front surface, lower surface, and both side surfaces of the product. The reason why the housing 7 and the air outlet panel 9 are made of separate parts is that when the housing 7 is provided with the opening of the air outlet 4, the opening is undercut in the die drawing direction. This is to prevent the mold making cost from increasing.

The back panel 8 is formed of metal, and is provided with a claw portion 10 for hooking into a hole provided in the wall surface mounting panel 13 fixed to the wall surface 12. The housing 7 and the air outlet panel 9 are fastened and fixed to the back panel 8 with screws.

The suction port 3 is provided on the front surface side of the upper surface of the outer shell 2. Here, the front side is the front side of the air curtain device 1. The back side end 3a of the suction port 3 is arranged on the front side of the central shaft 11 provided vertically on both side surfaces of the housing 7. Here, the central axis 11 coincides with the rotation center 5a of the fan 5. The front end 3b of the suction port 3 is preferably located on the front side of the upper surface of the housing 7 as much as possible in order to secure the area of the suction port 3.

The air outlet 4 is horizontally provided on the lower surface of the outer shell 2. The horizontal here means horizontal with respect to the vertical. Specifically, in the installed state of the air curtain device 1, the direction in which the blown airflow 4c is blown out is the vertical direction, and the plane intersecting the vertical direction is the blowout port 4. This is because the blown airflow 4c sent out from the blowout port 4 is blown out in parallel with the wall surface 12 on which the air curtain device 1 is installed.

The fan 5 rotates with the central axis 11 as the rotation center 5a. The fan 5 is a once-through fan 14 capable of uniformly blowing wind in the width direction (left-right direction) of the air curtain device 1.

An air passage structure 6 is provided in the air passage on the air outlet 4 side of the once-through fan 14. The air passage structure 6 is a portion shown by a thick line in FIG. Details of the vicinity of the air outlet 4 of the air passage structure 6 will be described with reference to FIG. FIG. 3 is an enlarged view of the vicinity of the air outlet of FIG.

The air passage structure 6 is composed of a stabilizer 6a having a function of stabilizing the flow and a rear guider 6b having a function of guiding the flow of the air flow toward the air outlet 4 on the air outlet 4 side of the once-through fan 14. NS. The stabilizer 6a is arranged on the front side of the air passage structure 6, and the rear guider 6b is arranged on the back side.

The stabilizer 6a has a convex portion 15a protruding toward the back side of the central axis 11, strictly speaking, a convex portion 15a protruding toward the back side of the circular surface passing through the central axis 11, and a concave portion 15b located on the front side of the convex portion. ing. Here, the convex portion 15a and the concave portion 15b are smoothly connected. That is, the lower end 16b of the convex portion 15a coincides with the upper end 17a of the concave portion, and the tangent line of the convex portion 15a and the tangent line of the concave portion 15b are located on the same straight line. The lower end 16b of the convex portion (upper end 17a of the concave portion) is the midpoint of a straight line connecting the end of R on the lower end side of the convex portion 15a and the end of R on the upper end side of the concave portion 15b. The stabilizer 6a extends from the upper end 16a of the convex portion toward the front surface side. Here, the upper end 16a of the convex portion is a position where the vertical straight line drawn vertically downward from the central axis 11 and the upper portion on the front surface side of the air passage structure 6 intersect.

The convex portion 15a and the concave portion 15b are provided over both ends of the once-through fan 14, and this is referred to as a tongue portion 18.

A front vertical wall 19 is provided from the lower end 17b of the recess, which is the end of R on the lower end side of the recess 15b, to the outer shell 2 in the vertical direction.

Next, the details of the shapes of the stabilizer 6a and the rear guider 6b in the air passage structure 6 will be described with reference to FIG. FIG. 4 is an enlarged view of the air passage structure 6 of FIG.

On the upper end side of the rear guider 6b located on the back surface side of the air passage structure 6, a convex shape is provided toward the once-through fan 14. This is called the rear guider convex portion 26. The rear guider 6b and the rear guider convex portion 26 communicate with each other. The angle E51 on the upper surface side formed by the straight line E23 connecting the central axis 11 of the once-through fan 14 and the apex of the rear guider convex portion 26 and the vertical straight line passing through the central axis 11 is in the range of 15 ° to 25 ° and is on the straight line E23. The distance E52 between the outer diameter of the once-through fan 14 and the rear guider convex portion 26 is preferably 3 to 7 mm in order to improve the fan performance of the air curtain device 1. With the rear guider convex portion 26 as a boundary, the distance between the central axis 11 and the surface of the rear guider 6b gradually increases from the rear guider convex portion 26 toward the suction port 3. Similarly, the distance between the central axis 11 and the surface of the rear guider 6b gradually increases from the rear guider convex portion 26 toward the air outlet 4 with the rear guider convex portion 26 as a boundary. The rear guider 6b is connected to the upper end of the back wall B21 constituting the rear guider 6b in an R shape toward the air outlet 4. Details of the back wall B21 will be described later.

The upper end of the stabilizer 6a extends from the upper end 16a of the convex portion toward the front surface side. The distance from the central axis 11 to the surface of the stabilizer 6a is reduced from the rearmost position of the tongue portion 18 toward the upper side and the front side. The distance F53 between the stabilizer upper end 22 which is the upper end of the stabilizer 6a and the outer shape of the once-through fan 14 is 3 to 7 mm, and the angle F54 on the front side formed by the straight line F24 and the straight line E23 connecting the central axis 11 and the stabilizer upper end 22 is 170 °. The range of about 190 ° is preferable in order to improve the fan performance of the air curtain device 1. The reason for setting the angle F54 between 170 ° and 190 ° is to reduce the difference between the air volume to be sucked in and the air volume to be blown out with respect to the once-through fan 14, and to stabilize the flow in the air passage.

On the lower end side of the rear guider 6b, the front wall A20 constitutes a vertical range from the upper end 17a of the recess, which is the upper end of the recess 15b, to the lower end 19b of the front vertical wall, which is the lower end of the front vertical wall 19, and the left and right ranges of both ends of the once-through fan 14. A back wall B21 (thick line portion on the back side shown in FIG. 4) having the same shape as (thick line portion on the front side shown in FIG. 4) is provided. The back wall B21 is on the back side of the front wall A20 and is parallel to the distance between the front end 4b of the air outlet 4 (the same position as the lower end 19b of the front vertical wall) and the back end 4a. It has a provided configuration. That is, the front wall A20 and the back wall B21 have the same shape and are in a plane-parallel positional relationship over both ends of the once-through fan 14.

In the above configuration, the airflow flowing in from the suction port 3 is boosted by the through-flow fan 14 and the air passage structure 6, and then flows toward the front side once before being blown out vertically from the outlet 4. It becomes. That is, the angle of the airflow from the suction port 3 to the outlet 4 can be brought close to 90 ° around the central axis 11 of the once-through fan 14, and the fan efficiency of the once-through fan 14 can be improved. Further, by deflecting the flow toward the front side in the vertical direction and providing a straight portion consisting of the front vertical wall 19 and the back vertical wall 25 facing the front vertical wall 19, the straightness of the blown airflow 4c is improved, and the air curtain device 1 is used. Performance can be improved.

As a result, even if the suction port 3 is provided on the upper surface side, it is possible to suppress the deterioration of the performance of the air curtain device 1.

Further, the front wall A20 is further arranged on the front side of the central axis 11. As a result, the angle of the airflow can be made closer to 90 °, and the performance of the once-through fan can be improved.

If the front vertical wall 19 included in the front wall A20 is arranged on the front side of the central axis 11, the same effect can be expected.

Next, the shape of the air passage structure 6 will be described with reference to FIG. Here, FIG. 5 is the same cross-sectional view as that of FIG.

The distance from the central axis 11 from the rear side of the air passage structure 6 closest to the suction port 3, that is, from the rear guider convex portion 26 to the uppermost portion 21a of the rear wall B21 is gradually increasing. That is, the structure is such that the distance from the central axis 11 from the rear guider convex portion 26 to the uppermost portion of the back wall B21 gradually increases. As a result, the airflow can be sufficiently boosted between the once-through fan 14 and the rear guider 6b, and the increase in pressure loss due to the reduction of the air passage can be suppressed.

Further, when viewed from the side, a straight line X30 connecting the intermediate point 3c, which is the intermediate point between the front side end portion 3b and the back side end portion 3a of the suction port 3, and the central axis 11, and the upper end portion (that is, 17a) of the front wall A20. ) And the straight line Y31 connecting the midpoint 32 and the central axis 11 with the uppermost portion 21a of the back wall B21. It is configured to be larger (angle X33> angle Y34). As a result, the angle of the airflow can be made closer to 90 °, and the once-through fan 14 moves to the back side. Therefore, while improving the performance of the once-through fan, the thickness of the product can be suppressed and the size can be reduced. can.

The air curtain device of the present invention can be applied not only for the purpose of shutting off the outside air at the entrance of a building, but also for an application as a circulator that agitates indoor air by diverting it to a blower device having a built-in once-through fan.

1 Air curtain device 2 Outer shell 3 Suction port 3a Back side end of suction port 3b Front side end of suction port 3c Midpoint 4 Air outlet 4a Back side end of air outlet 4b Front side end of air outlet 5 Fan 5a Center of rotation 6 Air passage structure 6a Stabilizer 6b Rear guider 7 Housing 8 Rear panel 9 Air outlet panel 10 Claw 11 Central axis 12 Wall surface 13 Wall mounting panel 14 Throughflow fan 15a Convex part 15b Concave part 16a Convex part upper end 16b Convex part lower end 17a Top of recess 17b Bottom of recess 18 Tongue 19 Front vertical wall 19b Bottom of front vertical wall 20 Front wall A
21 Back wall B
21a Top of back wall B 22 Top of stabilizer 23 Straight line E
24 straight line F
25 Rear vertical wall 26 Rear guider convex part 30 Straight line X
31 straight line Y
32 Midpoint 33 Angle X
34 angle Y
40 motor 51 angle E
52 Distance E
53 Distance F
54 angle F
101 Motor 102 Throughflow fan 103 Wall surface 104 Mounting plate 105 Back panel 106 Rear guider 107 Stabilizer 108 Suction panel 109 Outer panel 110 Suction port 111 Rotational direction 112 Suction airflow 113, 4c Blowout airflow 114 Blowout

Claims (4)

An air curtain device including a housing constituting the outer shell, a suction port for taking in air inside the outer shell, an air outlet for blowing air to the outside of the outer shell, and a fan for guiding air from the suction port to the air outlet. hand,
With the suction port provided on the upper surface of the outer shell,
With the outlet provided horizontally on the lower surface of the outer shell,
A once-through fan as the fan that rotates about a central axis provided perpendicularly to both side surfaces of the housing.
The air passage structure provided in the air passage on the outlet side of the once-through fan is provided.
The air passage structure is
On the front side of the air passage structure,
A tongue portion having a convex portion protruding to the back side of the central axis and a concave portion located on the front side of the convex portion, and the convex portion and the concave portion are provided across both ends of the once-through fan. ,
E Bei and a front vertical wall provided vertically downward from the lower end of the recess,
The vertical range from the upper end of the recess to the lower end of the front vertical wall and the left and right range of both ends of the once-through fan are defined as the front wall A.
The front wall A is an air curtain device further arranged on the front side of the central axis. An air curtain device including a housing constituting the outer shell, a suction port for taking in air inside the outer shell, an air outlet for blowing air to the outside of the outer shell, and a fan for guiding air from the suction port to the air outlet. hand,
With the suction port provided on the upper surface of the outer shell,
With the outlet provided horizontally on the lower surface of the outer shell,
A once-through fan as the fan that rotates about a central axis provided perpendicularly to both side surfaces of the housing.
The air passage structure provided in the air passage on the outlet side of the once-through fan is provided.
The air passage structure is
On the front side of the air passage structure,
A tongue portion having a convex portion protruding to the back side of the central axis and a concave portion located on the front side of the convex portion, and the convex portion and the concave portion are provided across both ends of the once-through fan. ,
A front vertical wall provided vertically downward from the lower end of the recess is provided.
The vertical range from the upper end of the recess to the lower end of the front vertical wall and the left and right range of both ends of the once-through fan are defined as the front wall A.
The distance from the central axis to the top of the back wall B facing the front wall A on the back side of the front wall A, starting from the back side of the air passage structure closest to the suction port, is An air curtain device that gradually expands. When viewed from the side, a straight line X connecting the midpoint between the front end and the back end of the suction port and the central axis, and the middle between the upper end of the front wall A and the upper end of the back wall B. The air curtain device according to claim 2, wherein the angle formed by the intersection of the point and the straight line Y connecting the central axis is larger on the back side than on the front side. The upper end of the back wall B is
The air curtain device according to claim 3, which is a position horizontally moved from the upper end of the recess of the back wall A to the back side.

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