JP2020143798A - Blowout box device - Google Patents

Abstract

To obtain an excellent rectification characteristic at a blowout port with a relatively simple configuration using a flat plate or a cylindrical member.SOLUTION: A rectification unit 20 that rectifies air blown out from a blowout port 12 has: a pipe part 21 that is provided so as to communicate vertically with the blowout port 12, and through which air blown out from the blowout port 12 flows; a shielding plate 22 that is provided in parallel with a virtual plane P substantially perpendicular to a pipe axis O of the pipe part 21, shields a part of a region on a side far from an inflow port 11 out of an entire flow passage region 30 of the pipe part 21, that is, a shielding region 32, and allows air to flow from the remaining opening region 31 to the blowout port 12; a first rectification mesh 23A provided in parallel with the virtual plane P on the downstream side of the shielding plate 22 in the pipe part 21; and a second rectification mesh 23B provided in parallel with the virtual plane P on the downstream side of the first rectification mesh 23A in the pipe part 21.SELECTED DRAWING: Figure 1

Description

The present invention relates to a blowout box device for rectifying conditioned air supplied through a duct and blowing it out into an indoor space.

Generally, in a duct-type air conditioning system such as a building, a duct connected to an air conditioner is connected to a plurality of outlet box devices (chambers) distributed behind the ceiling, and an outlet provided on the bottom surface of the outlet box device is provided. , It is connected to a diffuser (Diffuser) or anemostat (Anemostat) installed on the ceiling to supply air-conditioned air to the indoor space.

Conventionally, as one of such blowout box devices, two straightening vanes having a large number of small holes formed are provided on the outer peripheral side inside the elbow type connection duct, and one straightening vane is a blowing chamber and an elbow. A predetermined gap is provided from the outer peripheral end of the connection surface along the connection surface with the mold connection duct, and the other straightening vane is separated from one straightening vane with the outer peripheral end of the connecting surface as a fulcrum. It has been proposed that the device is provided in a posture of being rotated at an arbitrary angle from 0 degrees to 90 degrees (see, for example, Patent Document 1). As a result, even when a sufficient facility space cannot be secured, the drift state of the blown air can be eliminated, and a uniform airflow distribution state can be secured in the room.

Japanese Unexamined Patent Publication No. 2009-198014

According to the above-mentioned Patent Document 1, it is necessary to provide a component having a special shape and structure such as an elbow type connection duct with a straightening vane above the outlet of the outlet box device. For this reason, there is a problem that the structure becomes complicated and not only the product / manufacturing cost but also the installation work load at the site increases.

Considering the circumstances such as parts acquisition and on-site installation, it is common to use a duct or blowout box device having a relatively simple structure using a flat plate or a cylindrical member. In addition, since there is often little room in the height direction of the attic space, generally, a blowout box device is used in which a duct is connected to the side surface to supply air and an outlet is provided on the bottom of the box. Has been done. However, even when using a duct or outlet box device with such a general simple configuration, in order to eliminate temperature unevenness in the air-conditioned indoor space and to avoid interference with adjacent outlets. In addition, good rectification characteristics at the air outlet, that is, uniform airflow characteristics without bias are often emphasized, and improvement is required.

The present invention is for solving such a problem, and an object of the present invention is to obtain good rectifying characteristics at an outlet with a relatively simple configuration using a flat plate or a cylindrical member.

In order to achieve such an object, the blowout box device according to the present invention is formed on a hollow box-shaped box body and one side surface of the box body, and a flow in which air flows into the internal space of the box body. The rectifying unit includes an inlet, an outlet formed on the bottom surface of the box body and for blowing out air in the internal space to the outside, and a rectifying unit for rectifying the air blown out from the outlet. It is provided in the pipe portion so as to communicate substantially perpendicular to the outlet and in parallel with a pipe portion through which air blown from the outlet flows and a virtual plane substantially perpendicular to the pipe axis of the pipe portion. A shielding plate that shields a part of the entire flow path region of the pipe portion on the side far from the inflow port and allows the air to flow from the remaining opening region to the air outlet, and the pipe portion. Among them, the first rectifying mesh provided in parallel with the virtual plane on the downstream side of the shielding plate and the pipe portion provided in parallel with the virtual plane on the downstream side of the first rectifying mesh. It has a second rectifying mesh.

Further, in one configuration example of the blowout box device according to the present invention, the separation distance between the first rectifying mesh and the second rectifying mesh is larger than the separation distance between the shielding plate and the first rectifying mesh. large.

Further, in one configuration example of the blowout box device according to the present invention, the shielding plate is recessed from the convex portion or the opening region protruding toward the opening region at an intermediate position of the end facing the opening region. It has a recess.

Further, in one configuration example of the blowout box device according to the present invention, the shielding region shielded by the shielding plate in the entire flow path region of the pipe portion is asymmetrical when viewed from the direction of the inflow port.

Further, in one configuration example of the blowout box device according to the present invention, the first and second rectifying meshes are made of wire mesh or resin mesh.

Further, in one configuration example of the blowout box device according to the present invention, a flat plate provided in parallel with the virtual plane and flush with the upper end opening is further provided around the upper end opening of the pipe portion. There is.

Further, in one configuration example of the blowout box device according to the present invention, the pipe portion is provided so as to project outward from the bottom surface of the box body.

Further, one configuration example of the outlet box device according to the present invention further includes an outlet connection portion provided so as to project outward from the bottom surface of the box body so as to communicate with the outlet, and the pipe portion has a lower end. Is provided in the internal space so as to communicate with the upper end opening of the outlet connecting portion.

According to the present invention, the combination of the shielding plate and the first rectifying mesh allows the rectifying portion to be oblique from a horizontal angle to the rectifying portion and to enter toward the side (back) far from the inflow port on the side surface of the box. The incoming air flow can be efficiently corrected at an angle closer to the vertical and closer to the center of the rectifying section. In addition, the combination of the first rectifying mesh and the second rectifying mesh allows the air flow entering the second rectifying mesh from an angle closer to the vertical to be along the mesh surface by demonstrating the original rectifying ability of the rectifying mesh. It can be made uniform in the vertical direction, that is, in the plane direction. Therefore, a sufficient rectifying effect, that is, a drift correction effect can be efficiently obtained, and a good rectifying characteristic at the air outlet can be obtained with a relatively simple configuration using a flat plate or a cylindrical member.

FIG. 1 is a side sectional view showing a configuration of a blowout box device according to the present invention. FIG. 2 is a top view, an AA cross-sectional view, and a bottom view showing the configuration of the rectifying unit. FIG. 3 is a side sectional view showing a configuration (penetration method) of the blowout box device according to the present invention. FIG. 4 is a side sectional view showing the configuration (outer method) of the blowout box device according to the present invention. FIG. 5 is an explanatory diagram showing an air flow (without a rectifying unit) in the box body. FIG. 6 is an explanatory diagram showing an air flow (with a rectifying unit) in the box body. FIG. 7 is a plan view showing the shape (convex portion) of the shielding plate. FIG. 8 is a plan view showing the shape (recess) of the shielding plate. FIG. 9 is a plan view showing the shape (inclination) of the shielding plate. FIG. 10 is a plan view showing the shape (bending) of the shielding plate. FIG. 11 is a top view showing a configuration example (flat plate) of the rectifying unit and a cross-sectional view of the BB. FIG. 12 is a top view and a CC sectional view showing a mounting structure of parts constituting the rectifying unit. FIG. 13 is a top view showing the unitization of the rectifying unit and a DD sectional view. FIG. 14 is an external view of the blowout box device used in the experiment. FIG. 15 is a side sectional view showing the configuration of the blowout box device used in the experiment. FIG. 16 is an explanatory view showing a measurement point (bottom view) of the wind speed. FIG. 17 is a graph showing the wind speed distribution (without the rectifying unit) of the blown air. FIG. 18 is a graph showing the wind speed distribution of the blown air (only two wire meshes). FIG. 19 is a graph showing the wind speed distribution (shield plate only) of the blown air. FIG. 20 is a graph showing the wind speed distribution (shielding plate + two wire meshes) of the blown air.

Next, an embodiment of the present invention will be described with reference to the drawings.
[Blow-out box device]
First, the blowout box device 1 according to the present embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a side sectional view showing a configuration of a blowout box device according to the present invention. FIG. 2 is a top view, an AA cross-sectional view, and a bottom view showing the configuration of the rectifying unit.
This air-conditioning box device 1 is used in a duct-type air conditioning system such as a building, and is installed in a distributed manner behind the ceiling, and air-conditioned air supplied from a duct connected to an air conditioner is supplied from an air outlet provided on the bottom surface to the ceiling. It is a device that blows out into the indoor space through the diffuser and anemostat installed in.

As shown in FIG. 1, the blowout box device 1 is formed mainly on a hollow box-shaped box body 10 provided with an internal space 10S and a box side surface 10A which is one side surface of the box body 10. An inflow port 11 in which air flows into the internal space 10S of the box body 10 through a duct, and an outlet 12 formed on the bottom surface 10B of the box of the box body 10 to blow out the air in the internal space 10S to the outside. It is provided with a rectifying unit 20 that rectifies the air blown out from the outlet 12.

A tubular inflow port connection portion 11A is provided on the box side surface 10A so as to communicate with the inflow port 11, and a duct (not shown) connected to the air conditioner is connected.
A tubular outlet connection portion 12A is provided on the bottom surface 10B of the box so as to communicate with the outlet 12, and a diffuser and an anemostat (both not shown) installed on the ceiling are connected to the bottom surface 10B.

[Rectifier]
As shown in FIGS. 1 and 2, the rectifying section 20 is mainly provided with a tube section 21 that is vertically communicated with the outlet 12 and through which air blown from the outlet 12 flows, and a tube. It is provided in parallel with the virtual plane P substantially perpendicular to the vertical direction Y along the pipe axis O of the pipe portion 21, and is a part of the entire flow path region 30 of the pipe portion 21 on the side far from the inflow port 11. A shielding plate 22 that shields the shielding region 32 and allows air to flow from the remaining opening region 31 to the air outlet 12, and a shielding plate 22 on the downstream side of the shielding plate 22 in parallel with the virtual plane P of the pipe portion 21. The first rectifying mesh 23A provided closest to the above, and the pipe portion 21 provided on the downstream side of the first rectifying mesh 23A in parallel with the virtual plane P and closest to the first rectifying mesh 23A. It has a second rectifying mesh 23B that has been obtained.

In the following, for ease of understanding, as shown in FIGS. 1 and 2, the direction perpendicular to the opening surface of the outlet 12 along the pipe axis O of the pipe portion 21 is referred to as the vertical direction Y, and is referred to as the vertical direction. A virtual plane substantially perpendicular to Y is called a virtual plane P. Further, the direction parallel to the virtual plane P and perpendicular to the opening surface of the inflow port 11 is referred to as the lateral direction X, and the direction parallel to the virtual plane P and perpendicular to the inflow port 11 is referred to as the left-right direction Z.
Further, in the present embodiment, the case where the pipe portion 21 is a circular pipe will be described as an example, but the present invention is not limited to this, and the pipe portion 21 composed of a pipe having an elliptical cross-sectional shape or a polygonal cross-sectional shape is described. May be used.

[Principle of the present invention]
Here, the principle of the present invention will be described. As a structure for rectifying the air flow in pipes and ducts in a blowout box device, pipes and ducts include a structure in which a plurality of wire meshes or perforated plates are arranged at intervals or a honeycomb plate (rectifying grid). Is considered to be arranged in the flow path so as to be substantially orthogonal to the longitudinal direction of the flow, that is, the direction of the flow. In this case, the overall air flow flows into the rectifying structure along the longitudinal direction of the pipe or duct, so that it can be rectified without any problem.

However, when it flows in from one side of the box body and is blown out from the outlet on the bottom of the box, if the conventional rectifying structure as described above is placed near the outlet, it starts from about 45 ° to the upper surface. The flow flows in at an angle close to parallel (horizontal). Moreover, the air flows in concentratedly on the side of the outlet far from the inlet on the side of the box. Therefore, the inventor has clarified that the conventional rectifying structure described above has an insufficient rectifying effect, and in particular, the effect of correcting the drift is very small, and there is room for improvement.

Here, the characteristics of the rectifying performance of each of the rectifying mesh, the perforated plate, and the honeycomb plate (rectifying grid) will be described. A rectifying mesh such as a wire mesh or a resin mesh basically equalizes the flow velocity distribution near the upstream surface while damping the turbulence and fluctuation of the flow as the fluid resistance generated when the flow passes through the mesh. The first effect of acting like this, the second effect of acting to make the flow velocity distribution uniform by the mixed diffusion action of the jets blown from each mesh to the downstream side, and the large vortex in the flow are divided by the mesh. It has a third effect of damping turbulence and fluctuation by making it a thin vortex. Since the magnitude of the fluid resistance of the first effect increases in proportion to the square of the flow velocity, the pressure in the part where the flow velocity is high on the upstream surface becomes higher, and the part where the flow is slow, that is, the pressure is low. It flows into the part and works in the direction of making the flow velocity distribution uniform.

The perforated plate basically has the same effect as the rectifying mesh, but generally has a higher fluid resistance than the rectifying mesh, and the ratio of the first effect is large. That is, the perforated plate has a smaller aperture ratio than the rectifying mesh for manufacturing reasons, and the perforated plate has a substantially circular shape with a smooth cross-sectional outer shape of the wires constituting the mesh. Since the cross-sectional shape has a rectangular shape with sharp edges, the fluid resistance increases due to the maximum flow velocity and turbulence of the jet that blows out from each mesh to the downstream side. Regarding the second effect, in general, the perforated plate has a larger distance between adjacent openings due to manufacturing reasons than the rectifying mesh, so that the mixing and diffusing action of the jet is weakened, which is necessary for mixing and diffusing. The approach distance on the downstream side is also longer than that of the rectifying mesh, that is, a larger space is required on the downstream side.

Honeycomb plates (rectifying grids) are generally difficult to reduce the size of each opening compared to rectifying mesh and perforated plates due to manufacturing reasons, and the thickness of the plate partitioning the openings is thin, so the flow that occurs There is little turbulence and the fluid resistance is small. Therefore, the effects of the above-mentioned rectifying mesh and the perforated plate are small, and the effect of correcting and equalizing the uneven flow (deviation) in the cross section of the flow path is also small. Since the flow path in the flow direction of the opening is long, the effect of aligning the flow direction in the flow direction is particularly large, so that it is suitable for rectifying a flow entering at an angle from an oblique direction or a swirling flow. The effect is great. However, the drift that has flowed into the honeycomb plate (rectifying grid) is blown out in a state of flow velocity distribution (shift flow) that is almost the same.

In the present invention, in order to make up for the drawbacks of the rectifying mesh represented by the wire mesh or the resin mesh and to efficiently utilize the advantages, the rectifying section 20 provided near the air outlet 12 of the box bottom surface 10B has the following configuration. I have to.

As shown in FIGS. 1 and 2, first, the shielding plate 22 is placed in the pipeline of the pipe portion 21, that is, in the pipe portion upper end 21A of the pipe portion 21 or inside the pipe portion 21, and the entire flow path region 30 of the pipe portion 21. Of these, a part of the flow path on the side far from the inflow port 11 of the box side surface 10A, that is, the shielding region 32 is provided substantially horizontally in parallel with the virtual plane P and is close to the lower side, that is, the downstream side thereof. The first rectifying mesh 23A is arranged in parallel with the virtual plane P.
As a result, the combination of the shielding plate 22 and the first rectifying mesh 23A is oblique to the rectifying portion 20 from an angle closer to the horizontal, and faces the side (back) far from the inflow port 11 of the box side surface 10A. It is possible to efficiently correct the incoming air flow at an angle closer to the vertical and closer to the center of the rectifying unit 20.

Then, the second rectifying mesh 23B is arranged in parallel with the virtual plane P on the lower side, that is, the downstream side of the first rectifying mesh 23A. As a result, the combination of the first rectifying mesh 23A and the second rectifying mesh 23B allows the air flow entering the second rectifying mesh 23B from an angle closer to the vertical to exhibit the original rectifying ability of the rectifying mesh. , It can be made uniform in the direction parallel to the mesh surface, that is, the virtual plane P. At this time, a larger effect can be obtained by arranging the second rectifying mesh 23B at a sufficient distance from the first rectifying mesh 23A.
Therefore, according to the present invention, a sufficient rectifying effect, that is, a drift correction effect can be efficiently obtained, and good rectifying characteristics at the outlet 12 can be obtained even with a simple configuration using a flat plate or a cylindrical member. Is possible.

[Details of rectifier]
Next, with reference to FIG. 2, the separation distance of the rectifying unit 20 according to the present invention will be described.
As shown in FIG. 2, the separation distance H2 between the first rectifying mesh 23A and the second rectifying mesh 23B is larger than the separation distance H1 between the shielding plate 22 and the first rectifying mesh 23A.
As a result, in a large number of jets generated in each mesh of the first rectifying mesh 23A, sufficient mixed diffusion is performed while the separation distance H2 is approached, and the drift is corrected, the flow direction is corrected to the vertical side, and the flow direction is corrected. , Flow turbulence and fluctuation stabilization are performed.

Then, the second rectifying mesh 23B extremely effectively equalizes the flow of air entering the second rectifying mesh 23B from an angle closer to the vertical in the direction parallel to the mesh plane, that is, the virtual plane P. Therefore, it is possible to efficiently obtain a sufficient rectifying effect, that is, a drift correction effect. On the other hand, as the separation distance H1 between the shielding plate 22 and the first rectifying mesh 23A is increased, the synergistic effect between the shielding plate 22 and the first rectifying mesh 23A becomes weaker, so that the separation distance H1 is set. It is necessary to set it smaller than the separation distance H2 between the first rectifying mesh 23A and the second rectifying mesh 23B.

Next, the arrangement position of the rectifying unit 20 will be described with reference to FIGS. 3 and 4. FIG. 3 is a side sectional view showing a configuration (penetration method) of the blowout box device according to the present invention. FIG. 4 is a side sectional view showing the configuration (outer method) of the blowout box device according to the present invention.
In FIG. 1, the pipe portion 21 of the rectifying unit 20 is provided in the internal space 10S of the box body 10 so as to be vertically communicated with the air outlet 12, and the air outlet connecting portion 12A is communicated with the air outlet 12. The case where the box main body 10 is provided so as to project outward from the box bottom surface 10B has been described as an example, but the present invention is not limited to this.

For example, as shown in FIG. 3, the point that the pipe portion 21 of the rectifying unit 20 is arranged in the internal space 10S of the box body 10 is the same as in FIG. 1, but the lower end 21B of the pipe portion of the pipe portion 21 is , The box main body 10 may be arranged so as to project outward from the box bottom surface 10B. Further, as shown in FIG. 4, the tube portion 21 itself of the rectifying portion 20 may be arranged so as to project outward from the box bottom surface 10B of the box body 10.
As a result, the pipe portion 21 itself of the rectifying unit 20 can also be used as a connecting portion for connecting a diffuser or an anemostat installed on the ceiling, the configuration and assembly work of the blowout box device 1 can be simplified, and the blowout box device can be simplified. The product cost of 1 can be reduced.

[the flow of air]
The flow of air in the box body 10 will be described in detail with reference to FIGS. 5 and 6. FIG. 5 is an explanatory diagram showing an air flow (without a rectifying unit) in the box body. FIG. 6 is an explanatory diagram showing an air flow (with a rectifying unit) in the box body. In FIGS. 5 and 6, the upper flow F1 and the lower flow F2 are divided into two as streamlines representing the air flow. In the following, in order to compare with the conventional configuration shown in FIG. 5, as shown in FIG. 6, a case where the blowout box device 1 has a configuration according to the configuration of FIG. 4 will be described as an example. The air flow is almost the same as that of FIG. 6 even if the configuration is shown in FIGS. 1 and 3, and the description thereof will be omitted here.

As shown in FIG. 5, when there is no rectifying unit 20, the lower flow F2 closer to the air outlet 12 directly flows diagonally to the inner side of the air outlet 12, but is farther from the air outlet 12. The upper flow F1 hits the inner surface of the internal space 10S of the box body 10 and is divided into two left and right, wraps around the left and right side surfaces when viewed from the inflow port 11, and flows into the vicinity of the central portion of the air outlet 12. To do. Therefore, the flow velocity is high on the back side of the outlet 12 far from the inflow port 11, and the flow velocity is slower on the front side, that is, closer to the inflow port 11, and a portion with almost no flow is generated. Further, since the above-mentioned upper flow F1 flows into the air outlet 12 while rotating left and right in the internal space 10S, the flow is unstable and the wind speed distribution becomes complicated on the opening surface of the air outlet 12.

On the other hand, as shown in FIG. 6, when the rectifying unit 20 is provided, the shielding plate 22 and the first rectifying mesh 23A form a high-pressure portion above the shielding plate 22, so that the above-mentioned upper side is formed. The flow F1 and the lower flow F2 are respectively straightened to the inflow port 11 side and flow into the first rectifying mesh 23A. Then, the flow of air that has passed through the first rectifying mesh 23A is corrected to a vertical flow while the flow velocity distribution is made uniform by the above three effects, and then flows into the second rectifying mesh 23B, and further, the second The flow velocity distribution is made uniform by the rectifying mesh 23B of No. 2, and the flow is corrected to a vertical flow and blown out from the outlet 12.

[Details of shielding plate]
Next, the details of the shielding plate 22 according to the present invention will be described with reference to FIG.
The shielding plate 22 has a shielding width W along the lateral direction X, which is about 1/5 to 1/3 of the total width L indicating the flow path diameter or the flow path opening width of the pipe portion 21, and is the shielding plate 22 and the third. The separation distance H1 from the rectifying mesh 23A of 1 is about 0 mm to 15 mm (more preferably about 5 mm to 10 mm). If the shielding plate 22 is arranged inside the pipe portion 21, for example, at a distance of about 5 mm from the upper end 21A of the pipe portion 21 of the pipe portion 21, the rectifying effect is improved, but the rectifying portion is increased by that distance. Since the height of the is high, it may be decided as necessary whether or not to implement it.

As a result, the height of the rectifying unit 20 along the vertical direction Y can be lowered, and the area of the shielding region 32, that is, the shielding plate 22 can be reduced, so that the height of the entire box body 10 can be lowered and the pressure loss can be reduced. There is a correlation between the separation distance H1 between the shielding plate 22 and the first rectifying mesh 23A and the shielding width W in which the shielding plate 22 shields the total width L indicating the flow path diameter or the flow path opening width of the rectifying portion 20. If H1 is reduced, the shielding width W can also be reduced. These sizes may be selected in consideration of the pressure loss and the state of the flow velocity distribution.

[Shape of shielding plate]
Next, the shape of the shielding plate 22 according to the present invention will be described with reference to FIGS. 7 to 10. FIG. 7 is a plan view showing the shape (convex portion) of the shielding plate. FIG. 8 is a plan view showing the shape (recess) of the shielding plate. FIG. 9 is a plan view showing the shape (inclination) of the shielding plate. FIG. 10 is a plan view showing the shape (bending) of the shielding plate.
As shown in FIG. 2, the shielding plate 22 has a bow shape in a plan view when the pipe portion 21 is a circular pipe, and the end portion 22A facing the opening region 31 has a linear shape along the left-right direction Z. The case of making is described as an example, but the present invention is not limited to this.

For example, as shown in FIG. 7, a convex portion 22B protruding toward the opening region 31 may be provided at a substantially central position of the end portion 22A, and as shown in FIG. 8, the end portion 22A along the left-right direction Z may be provided. A recess 22C recessed from the opening region 31 may be provided at an intermediate position, for example, a substantially central position.
As a result, when a variable air volume damper device or the like that adjusts the air volume is installed in the flow path (color) of the inflow port connection portion 11A, the drift at the air outlet 12 becomes larger than usual, but if necessary, the shielding plate The uniformity of the wind speed distribution can be improved by providing the convex portion 22B and the concave portion 22C at the end portion 22A of the 22 and changing the shape of the end portion 22A.

Further, as shown in FIG. 9, the end portion 22A may have a linear shape having an inclination with respect to the left-right direction Z, and as shown in FIG. 10, it is intermediate between the end portions 22A along the left-right direction Z. It may be bent at a position, for example, a substantially central position, one having a linear shape along the left-right direction Z and the other having an inclination with respect to the left-right direction Z.
As a result, when a variable air volume damper device or the like for adjusting the air volume is installed in the flow path (color) of the inflow port connection portion 11A, or when the internal space 10S of the box body 10 is parallel to the virtual plane P, the inflow port 11 The uniformity of the wind speed distribution can be further improved when the flow of air flowing into the internal space 10S is asymmetrical when viewed from the inflow direction of the wind speed.

[Shape of upper end of pipe]
Further, the flat plate 24 may be provided on the tube portion 21 of the rectifying portion 20. FIG. 11 is a top view and a BB sectional view showing a configuration example (flat plate) of the rectifying unit.
In the configuration example shown in FIG. 11, a flat plate 24 is provided around the upper end 21A of the pipe portion 21 so as to be flush with the upper end opening 21C of the pipe portion 21 in parallel with the virtual plane P.
As a result, turbulence when the air flow flows into the rectifying unit 20 can be reduced, rectifying efficiency can be improved, and pressure loss can be reduced.

[Details of rectifying mesh]
Next, the details of the first rectifying mesh 23A and the second rectifying mesh 23B according to the present invention will be described.
The first rectifying mesh 23A and the second rectifying mesh 23B are provided so as to cover the entire flow path region 30 of the pipe portion 21. Therefore, as shown in FIG. 2, when the pipe portion 21 is a circular pipe, the outer shapes of the first rectifying mesh 23A and the second rectifying mesh 23B have a circular shape in a plan view.

The first rectifying mesh 23A and the second rectifying mesh 23B are made of wire mesh or resin mesh, and have three rectifying effects as described in the above [principle of the present invention]. In particular, when a wire having a substantially circular cross-sectional outer shape, such as a general wire mesh or a resin mesh, is used, the fluid resistance can be significantly reduced as compared with the above-mentioned perforated plate, which is efficient. The flow velocity distribution can be made uniform. Further, by using the first rectifying mesh 23A and the second rectifying mesh 23B having an aperture ratio of 40% to 60%, a high rectifying effect can be obtained with a relatively low pressure loss.

In a general air outlet 12 in which the average in-plane wind speed at the air outlet 12 is used up to about 3 m / s, the size of the wire mesh constituting the first and second rectifying meshes 23A and 23B is 12 mesh to It is about 14 mesh, and the wire diameter is preferably about φ0.55 mm to φ0.7 mm.
Under the conditions in which the present invention is used, the separation distance H2 of the first and second rectifying meshes 23A and 23B makes the rectifying effect of the first and second rectifying meshes 23A and 23B sufficient and efficient. It is preferably about 13 to 20 times the opening size of the mesh in order to draw out the mesh. For example, when a wire mesh having a wire wire diameter of 0.6 mm with 12 meshes is used as the first and second rectifying meshes 23A and 23B, the opening size of the mesh is 1.52 mm, so that the separation distance H2 is 20 mm to 30 mm. Become.

When a plurality of rectifying meshes 23 (23A, 23B) having different sizes are used, the coarseness of each rectifying mesh 23 is lower than that of the upstream rectifying mesh 23. It is preferable to make the mesh 23 finer. Further, it is also preferable to install the rectifying meshes 23 (23A, 23B) facing each other with the eye orientation (wire orientation) shifted by 45 ° because the rectifying effect is improved. However, both of the above configurations may be carried out as necessary because the number of parts increases and the manufacturing process becomes complicated.

[Mounting structure of parts that make up the rectifying unit]
Next, with reference to FIG. 12, the mounting structure of the parts constituting the rectifying unit 20 according to the present invention will be described. FIG. 12 is a top view showing a mounting structure of parts constituting the rectifying unit and a CC sectional view.
When the tube portion 21, the first rectifying mesh 23A and the second rectifying mesh 23B are composed of a circular tube and a circular wire mesh, the shielding plate 22 having a bow shape in a plan view is a tube with an L-shaped metal fitting 25. It is fixed to the inner wall of the portion 21. Further, the first rectifying mesh 23A and the second rectifying mesh 23B sandwich the resin spacer 27 and are pressed by the L-shaped metal fittings 26 from above and below along the vertical direction Y, so that the L-shaped metal fittings 26 are pipes. It is fixed to the inner wall of the portion 21. The L-shaped metal fitting 26 is attached to the inner wall surface of the pipe portion 21 so as to look like an L-shape when viewed from the vertical direction Y. As a result, the occupied area in the vertical direction Y becomes small, and the resistance of the air flow generated by the L-shaped metal fitting 26 can be suppressed to be small. Further, as the spacer 27, a flame-retardant, flexible, and durable resin such as high-density polyethylene foam is preferable.

[Unitization of rectifier]
Next, the unitization of the rectifying unit 20 according to the present invention will be described with reference to FIG. FIG. 13 is a top view showing the unitization of the rectifying unit and a DD sectional view.
In FIG. 13, the entire rectifying unit 20 is unitized by a sheet metal housing 41 that also serves as a shielding plate 22 and an outer frame of the unit to form a rectifying unit 40, and the first rectifying mesh 23A and the second rectifying mesh 23B are used. An example is shown in which a first wire mesh 42A and a second wire mesh 42B having a rectangular outer shape are used.

The spacer 43A, the first wire mesh 42A, the spacer 43B, the second wire mesh 42B, and the spacer 43C are housed in the housing 41 in order from the upstream side along the air flow, and the rectifying unit 40 (rectifying unit 20). ) Is configured. The top plate 41A of the housing 41 is formed with a region other than the bow-shaped shielding region 32 corresponding to the shielding plate 22 as an opening region 31, and is formed on all four sides of the bottom portion 41B of the housing 41. , The side plate 44 continuous with the top plate 41A is formed by being bent outward so as to be parallel to the virtual plane P. The top plate 41A also has the same function as the flat plate 24 of the configuration example shown in FIG. 11 in the above-mentioned [shape of the upper end of the pipe portion].

The spacers 43A, 43B, 43C are substantially square foamed polyethylene resin plates in which a circular opening serving as an air flow path is formed in the center thereof, and the substantially square first and second wire meshes 42A, 42B. By sandwiching the above and below, a structure is formed in which the first and second wire meshes 42A and 42B are arranged at intervals in the circular flow path. The procedure for cutting the wire mesh and forming the outer shape is generally as follows: first, a small piece of a rectangle of an appropriate size is cut out from the roll material of the wire mesh, and if an arbitrary shape such as a circle is required, the rectangle is formed. It is manufactured by punching a small piece of paper with a press mold. Therefore, a rectangular wire mesh is preferable to a circular wire mesh because it requires fewer manufacturing steps. Similar to the configuration shown in FIG. 1, the rectifying unit 40 communicates with the air outlet 12 of the box bottom surface 10B of the box body 10 and is installed on the air outlet 12, and an anemostat or an anemostat is installed below the air outlet 12. An outlet connection portion 12A (not shown) for connecting the diffuser is installed. The rectifying unit 40 is fixed to the bottom surface 10B of the box with rivets, bolts, or the like using holes provided in the side plate 44.

[Effect of correcting drift in the rectifying section]
Next, with reference to FIGS. 14 to 16, the drift correction effect of the rectifying unit 20 of the present invention will be described using actual measurement data measured by experiments. FIG. 14 is an external view of the blowout box device used in the experiment. FIG. 15 is a side sectional view showing the configuration of the blowout box device used in the experiment. FIG. 16 is an explanatory view showing a measurement point (bottom view) of the wind speed. FIG. 17 is a graph showing the wind speed distribution (without the rectifying unit) of the blown air. FIG. 18 is a graph showing the wind speed distribution of the blown air (only two wire meshes). FIG. 19 is a graph showing the wind speed distribution (shield plate only) of the blown air. FIG. 20 is a graph showing the wind speed distribution (shielding plate + two wire meshes) of the blown air.

In the experiment, a blowout box device 1 for a duct having a nominal diameter of φ200 mm was used. As shown in FIGS. 14 and 15, an air volume adjusting damper 50 is installed in the inflow port connection portion 11A (color) connecting the ducts in the blowout box device 1, and the air outlet is shown in FIG. A rectifying unit 20 including the rectifying unit 40 shown is installed. At the time of measurement, the air volume adjusting damper 50 was set to a state in which the damper blade 51 was opened in the horizontal direction (horizontal direction X) by 75 ° from the vertical direction (vertical direction Y), that is, a fully open state in actual use.

In such a measurement environment, the air flow in the inflow port connection portion 11A is throttled by the damper blade 51, the motor 52 for driving the damper, and other mechanical parts, and the wind speed flowing into the box body 10 is increased. The maximum value becomes higher. Further, the mechanical parts of the air volume adjusting damper 50 such as the motor 52 are located at uneven positions in the air flow path. For this reason, the degree of flow turbulence and drift is higher than in the normal case without the air volume adjusting damper 50, and the measurement environment is more difficult to rectify.

Further, in the measurement of the drift correction effect of the rectifying unit 20, as shown in FIG. 15, an outlet connecting portion 12A (color) having an inner diameter of φ196 mm (nominal diameter 200 mm) and a length of 85 mm is attached to the outlet 12, and the outlet 12A (collar) is attached to the outlet 12. From the center point of the outlet connection portion 12A, that is, from the pipe axis O, on the measurement surface Q parallel to the virtual plane P at a height of about 30 mm from the lower end opening 12C of the outlet connection portion 12A into the outlet connection portion 12A. The wind velocity of the blown air at a plurality of measurement points M1, M2, M3, M4, M5 provided at intervals of 45 ° on concentric circles C at equidistant distances was measured with a general Pitot tube.

As a result of the measurement, as shown in FIG. 17, when the rectifying unit 20 is not provided, the wind speed on the front side (measurement point M1) near the inflow port 11 is 0 m / s, but the wind speed on the back side far from the inflow port 11 (measurement point). In M4 and M5), there is a large difference of about 5 m / s. Further, it can be seen that the degree of drift is high due to the difference in wind speed between the left side region Ca on the left side and the right side region Cb on the right side in the left-right direction Z when viewed from the inflow direction of the inflow port 11 in the concentric circles C. The wind speed in the left region Ca is lower than that in the right region Cb because the air flow is blocked by the motor 52 of the air volume adjusting damper 50 upstream of the left region Ca. it is conceivable that.

On the other hand, as shown in FIG. 18, when the rectifying unit 20 is provided with only two wire meshes 42 (42A, 42B), the drift of air is slightly suppressed, and the difference in wind speed between the left side region Ca and the right side region Cb is almost the same. The difference in wind speed between the front side (measurement point M1) and the back side (measurement point M5) has become smaller, but there is still a difference of about 1.5 m / s.
Further, as shown in FIG. 19, when only the shielding plate 22 is provided in the rectifying unit 20, the wind speed on the back side (measurement point M5) is suppressed, and the peak of the wind speed moves toward the center (measurement point M3). However, the wind speed remains 0 m / s on the front side (measurement point M1), and the difference in wind speed between the left side region Ca and the right side region Cb is slightly large.

On the other hand, when the configuration of the present invention shown in FIG. 20, that is, when the rectifying unit 20 is provided with the shielding plate 22 and the two wire mesh 42 (42A, 42B), the wind speed at each measurement point M1 to M5 is made uniform. It can be seen that the difference between the maximum value and the minimum value is suppressed to about 0.5 m / s, specifically 16% or less of the maximum value of 3.2 m / s, and a sufficient drift correction effect is obtained.
As a guideline for correcting the drift of the rectifying unit 20, considering the description in publicly known documents and the like, the same height, that is, on the same measurement surface Q in the outlet connecting portion 12A (color) attached to the outlet 12. At a plurality of measurement points on the concentric circles C, for example, it is preferable that the difference between the maximum wind speed and the minimum wind speed is about 20% or less, specifically about 10 to 20%.

Even if the shielding plate 22 is not used, if the number of wire meshes 42 (42A, 42B) is increased to 3, 4, or 5, the same drift correction effect as when the shielding plate 22 is used can be obtained. However, there is not much room in the height direction of the ceiling of the building, and the height of the box body 10 is required to be as low as possible, so the height of the rectifying unit 20 is high. Is difficult to raise. Since the distance between the wire mesh 42 needs to be about 20 to 30 mm, if the number of wire meshes 42 is increased by one, the height of the box body 10 will be increased by 20 to 30 mm. Therefore, the number of wire meshes 42 can be improved. Not the preferred method. Further, it was found in an experiment that the method of finely meshing the wire mesh 42 to increase the rectifying effect is not efficient because the improvement effect of the drift flow is small in spite of the increase in pressure loss.

[Effect of this embodiment]
As described above, in the present embodiment, as the rectifying unit 20 for rectifying the air blown out from the outlet 12, the air is vertically communicated with the outlet 12 and the air blown out from the outlet 12 flows. The pipe portion 21 is provided in the pipeline of the pipe portion 21 in parallel with the virtual plane P substantially perpendicular to the pipe axis O of the pipe portion 21, and is far from the inflow port 11 in the entire flow path region 30 of the pipe portion 21. A shielding plate 22 that shields a part of the side region, that is, the shielding region 32, and allows air to flow from the remaining opening region 31 to the outlet 12, and a virtual plane P on the downstream side of the shielding plate 22 in the pipe portion 21. A tube portion 21 having a first rectifying mesh 23A provided in parallel and a second rectifying mesh 23B provided in parallel with the virtual plane P on the downstream side of the first rectifying mesh 23A. Is.

As a result, the combination of the shielding plate 22 and the first rectifying mesh 23A is oblique to the rectifying portion 20 from an angle closer to the horizontal, and faces the side (back) far from the inflow port 11 of the box side surface 10A. It is possible to efficiently correct the incoming air flow at an angle closer to the vertical and closer to the center of the rectifying unit 20. In addition, the combination of the first rectifying mesh 23A and the second rectifying mesh 23B allows the air flow entering the second rectifying mesh 23B from a vertical angle to exert the original rectifying ability of the rectifying mesh. It can be made uniform in the direction along the surface, that is, in the direction parallel to the virtual plane P.
Therefore, according to the present invention, it is possible to efficiently obtain a sufficient rectifying effect, that is, a drift correction effect, and to obtain good rectifying characteristics at the outlet 12 with a relatively simple configuration using a flat plate or a cylindrical member. It will be possible.

Further, in the present embodiment, the separation distance H2 between the first rectifying mesh 23A and the second rectifying mesh 23B is preferably larger than the separation distance H1 between the shielding plate 22 and the first rectifying mesh 23A. As a result, in the second rectifying mesh 23B, the flow entering the second rectifying mesh 23B from an angle closer to the vertical is extremely effectively uniform in the direction along the mesh plane, that is, in the direction parallel to the virtual plane P. Therefore, it is possible to efficiently obtain a sufficient rectifying effect, that is, a drift correction effect.

Further, in the present embodiment, the shielding plate 22 shields about 1/5 to 1/3 of the total width L indicating the flow path diameter or the flow path opening width of the pipe portion 21, and shields the shielding plate 22 and the first rectification. The separation distance H1 from the mesh 23A is preferably about 0 mm to 15 mm.
As a result, the height of the rectifying unit 20 along the vertical direction Y can be lowered, and the area of the shielding region 32, that is, the shielding plate 22 can be reduced, so that the height of the entire box body 10 can be lowered and the pressure loss can be reduced. There is a correlation between the separation distance H1 between the shielding plate 22 and the first rectifying mesh 23A and the shielding width W in which the shielding plate 22 shields the total width L indicating the flow path diameter or the flow path opening width of the rectifying portion 20. If H1 is reduced, the shielding width W can also be reduced.

Further, in the present embodiment, the shielding plate 22 may be provided with a convex portion 22B protruding toward the opening region 31 or a concave portion 22C recessed from the opening region 31 at the end portion 22A facing the opening region 31.
As a result, when a variable air volume damper device or the like that adjusts the air volume is installed in the flow path (color) of the inflow port connection portion 11A, the drift at the air outlet 12 becomes larger than usual, but the end portion 22A of the shielding plate 22 The uniformity of the wind speed distribution can be further improved by providing the convex portion 22B and the concave portion 22C on the surface and changing the shape of the end portion 22A.

Further, in the present embodiment, the shielding region 32 shielded by the shielding plate 22 in the entire flow path region 30 of the pipe portion 21 may be left-right asymmetric when viewed from the direction of the inflow port 11.
As a result, when a variable air volume damper device or the like for adjusting the air volume is installed in the flow path (color) of the inflow port connection portion 11A, or when the internal space 10S of the box body 10 is parallel to the virtual plane P and in the inflow direction. The uniformity of the wind speed distribution can be further improved when the air flow in the internal space 10S is asymmetrical, such as when the air flow is asymmetrical when viewed from the left and right.

Further, in the present embodiment, wire mesh or resin mesh may be used as the first and second rectifying meshes 23A and 23B.
As a result, since the cross-sectional outer shape of the wire constituting the mesh of the wire mesh or the resin mesh is smooth and substantially circular, the fluid resistance can be significantly reduced as compared with the perforated plate having the same effect as the rectifying mesh, which is efficient. The flow velocity distribution can be made uniform.

Further, in the present embodiment, the first and second rectifying meshes 23A and 23B may have an aperture ratio of 40% to 60%.
As a result, a high rectifying effect can be obtained with a relatively low pressure loss.

Further, in the present embodiment, a flat plate 24 provided in parallel with the virtual plane P and flush with the upper end opening 21C may be further provided around the upper end opening 21C of the pipe portion 21.
As a result, turbulence when the air flow flows into the rectifying unit 20 can be reduced, rectifying efficiency can be improved, and pressure loss can be reduced.

Further, in the present embodiment, the pipe portion 21 may be provided so as to project outward from the box bottom surface 10B of the box main body 10.
As a result, the pipe portion 21 itself of the rectifying portion 20 can also be used as a connecting portion for connecting a diffuser or an anemostat installed on the ceiling, and the configuration and assembly work of the blowout box device 1 can be simplified, and the blowout box device can be simplified. The product cost of 1 can be reduced.

Further, in the present embodiment, the outlet connecting portion 12A is provided so as to project outward from the box bottom surface 10B of the box body 10 so as to communicate with the outlet 12, and the pipe portion 21 has an outlet at the lower end 21B of the pipe portion. It may be provided in the internal space 10S so as to communicate with the upper end opening 12B of the connecting portion 12A.
As a result, the rectifying unit 20 can be separated from the air outlet connecting unit 12A for connecting the diffuser or anemostat installed on the ceiling, so that the rectifying unit 20 can be separated without being restricted by the shape of the air outlet connecting unit 12A. It can be designed, and a sufficient rectifying effect, that is, a drift correction effect can be efficiently obtained.

[Extension of Embodiment]
Although the present invention has been described above with reference to the embodiments, the present invention is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be made to the structure and details of the present invention within the scope of the present invention. In addition, each embodiment can be implemented in any combination within a consistent range.

1 ... outlet box device, 10 ... box body, 10A ... box side surface, 10B ... box bottom surface, 10S ... internal space, 11 ... inlet, 11A ... inlet connection, 12 ... outlet, 12A ... outlet connection, 12B ... upper end opening, 12C ... lower end opening, 20 ... rectifying part, 21 ... pipe part, 21A ... upper end of pipe part, 21B ... lower end of pipe part, 21C ... upper end opening, 22 ... shielding plate, 22A ... end part, 22B ... Convex, 22C ... Concave, 23A ... First rectifying mesh, 23B ... Second rectifying mesh, 24 ... Flat plate, 25, 26 ... L-shaped metal fittings, 27 ... Spacer, 30 ... All flow path area, 31 ... Opening area, 32 ... shielding area, 40 ... rectifying unit, 41 ... housing, 41A ... top plate, 41B ... bottom, 42, 42A, 42B ... wire mesh, 43A, 43B, 43C ... spacer, 44 ... side plate, 50 ... air volume Adjustment damper, 51 ... damper blade, 52 ... motor, O ... tube axis, P ... virtual plane, X ... horizontal direction, Y ... vertical direction, Z ... horizontal direction, H1, H2 ... separation distance, L ... total width, W ... shielding width, M1, M2, M3, M4, M5 ... measurement point, Q ... measurement surface, C ... concentric circles, Ca ... left region, Cb ... right region.

Claims (8)

Hollow box-shaped box body and
An inflow port formed on one side of the box body and allowing air to flow into the internal space of the box body,
An outlet formed on the bottom surface of the box body to blow out the air in the internal space to the outside,
It is provided with a rectifying unit that rectifies the air blown out from the outlet.
The rectifying unit
A pipe portion that is provided to communicate with the air outlet substantially perpendicularly and through which air blown from the air outlet flows.
Provided in the pipe portion in parallel with a virtual plane substantially perpendicular to the pipe axis of the pipe portion, a part of the entire flow path region of the pipe portion on the side far from the inflow port is shielded, and the rest. A shielding plate that allows the air to flow from the opening region to the outlet,
Of the pipe portion, a first rectifying mesh provided on the downstream side of the shielding plate in parallel with the virtual plane, and
A blowout box device having a second rectifying mesh provided in parallel with the virtual plane on the downstream side of the first rectifying mesh in the pipe portion. In the blowout box device according to claim 1,
A blowout box device characterized in that the separation distance between the first rectifying mesh and the second rectifying mesh is larger than the separation distance between the shielding plate and the first rectifying mesh. In the blowout box device according to claim 1 or 2.
The shielding plate is a blowout box device having a convex portion protruding toward the opening region or a concave portion recessed from the opening region at an intermediate position of an end portion facing the opening region. In the blowout box device according to any one of claims 1 to 3.
A blowout box device characterized in that the shielding region shielded by the shielding plate in the entire flow path region of the pipe portion is asymmetrical when viewed from the direction of the inflow port. In the blowout box device according to any one of claims 1 to 4.
The blowout box device, wherein the first and second rectifying meshes are made of a wire mesh or a resin mesh. In the blowout box device according to any one of claims 1 to 5.
A blow-out box device comprising a flat plate provided flush with the upper end opening in parallel with the virtual plane around the upper end opening of the pipe portion. In the blowout box device according to any one of claims 1 to 6.
The blowout box device is characterized in that the pipe portion is provided so as to project outward from the bottom surface of the box body. In the blowout box device according to any one of claims 1 to 6.
Further provided with an outlet connection portion provided so as to project outward from the bottom surface of the box body so as to communicate with the outlet.
The outlet box device is characterized in that the lower end of the pipe portion is provided in the internal space so as to communicate with the upper end opening of the outlet connection portion.