JPH1130438A - Conical chamber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To guide air streams, which flow into a chamber from respective ducts, into a main branch pipe without disturbing them by a method wherein a conical bottom lid, having no bottom surface wall, is attached air-tightly to an opening at one end of a cylindrical member so that the apex of the conical shape is faced to the inside of the cylindrical member. SOLUTION: A conical bottom lid 15, having no bottom surface wall, is attached to an opening at one end of a cylindrical member 11 air-tightly so that the apex of the conical shape is faced to the inside of the cylindrical member 11 whereby the bottom unit of a chamber 20 is formed. On the other hand, a conical upper lid 17, having no bottom surface wall, is attached to the other opening at the other end of the cylindrical member 11 so that the apex of the conical shape is faced to the outside of the cylindrical member. Air, which flows into the chamber 20 through ducts 14, flows to the direction of a main branch pipe 18, however, the center of the bottom lid 15 is projected into the chamber 20 in this case whereby mutual collision of inflow air from respective ducts 14 can be avoided and the stream of air is regulated along the slope of the bottom lid 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chamber connected to an indoor ventilation duct of a living space such as a house, an office building, and a hotel. The present invention relates to a chamber that can be easily adjusted.

[0002]

2. Description of the Related Art In recent years, sick house syndrome, in which allergic diseases caused by house dust and the like and harmful substances such as formaldehyde released from house building materials impair occupants' health, has become a problem. It is speculated that such problems are partly due to the rapid progress in hermetic housing in response to energy conservation policies.

[0003] As means for solving such a problem,
The problem of ventilation in indoor spaces is becoming increasingly important.However, in the conventional ventilation with the installation of air supply and exhaust holes, the location and size of the air supply and exhaust holes, It has been found that natural conditions such as wind do not allow the air supply and exhaust holes to play its role. Therefore,
It has been recognized that planned ventilation, which freely controls indoor ventilation while increasing the airtightness of a house, is the best way to solve these various problems.

[0004] Such planned ventilation can only be achieved by mechanically venting by establishing a fresh air inflow and a contaminated air outflow path. A ventilation system for performing planned ventilation is roughly classified into a confluent pipe system and a chamber system from the viewpoint of a piping structure.

In the merged pipe system, as shown in FIG. 5, ducts attached to air supply / exhaust holes A1 to A5 provided in respective chambers are merged on the way to finally connect one main duct 1 to a fan 2 However, there is a drawback that the main duct 1 is elongated, or the pressure loss is not large due to the use of a T-type merging pipe. For this reason, it is necessary to use the fan 2 with a large static pressure, and there is a problem that equipment cost and running cost are required.

On the other hand, in the chamber system, as shown in FIG. 6, supply / exhaust holes B1 to B5 provided in each chamber are provided.
The ducts C1 to C5 attached to the
And a single main duct 5 connects between the chamber 3 and the fan 4. here,
As the chamber 3, as shown in FIG. 7, a plurality of branch holes 8 are formed on a side surface of a box-shaped container 7, and a branch branch pipe 9 for attaching a duct to each branch hole 8 is provided. That is used. A main branch pipe 10 for attaching a main duct is provided on the upper surface of the chamber 3.
Is provided.

[0007]

Problems to be Solved by the Invention However, FIG.
As shown in the sectional view of FIG. 8, in the chamber having the structure as shown in FIG. Since these turbulences repeatedly collide with the wall surface of the chamber 3 and generate countless vortices in the chamber 3, there is a problem that the pressure loss increases. For this reason, the flow rate in the duct can be made smaller than in the merged pipe system, and the pressure loss can be greatly reduced.

Considering the present invention, the effect of the chamber system that the flow rate can be adjusted by the exhaust grille very easily by reducing the difference between the lengths of the ducts has been sufficiently exhibited. Did not.

The present invention has been made in view of such a problem of the conventional chamber, and an object of the present invention is to provide a main branch without disturbing the flow of air flowing from each duct into the chamber. An object of the present invention is to provide a chamber having a small pressure loss that can be guided to a pipe.

[0010]

That is, according to the present invention, at least a plurality of branch holes are formed at the same height position on the side surface of the cylindrical member, and a branch branch pipe is disposed in the branch hole. A conical bottom lid having no bottom wall is hermetically attached to the opening at one end of the cylindrical member so that the conical apex faces the inside of the cylindrical member. The opening at the end does not have a bottom wall, and a top lid with a substantially trapezoidal cross section having a top opening with a conical apex cut off so that the top opening faces the outside of the cylindrical member. Is attached to the upper opening of the upper lid,
A conical chamber is provided, wherein a main branch pipe is provided.

Here, in the conical chamber of the present invention, it is preferable that the angles of the conical vertices of the bottom cover and the top cover are equal, and the distance between the branch holes is preferably constant. Further, it is preferable that the position of the vertex of the substantially conical bottom cover is located at a height closer to the upper lid than to the lowermost portion of the branch hole.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION In the conical chamber of the present invention, since the air flowing from the duct collides with the conical bottom and flows to the main branch pipe, turbulence occurs in the chamber. Is suppressed, and as a result, pressure loss can be reduced. Hereinafter, the present invention will be described with reference to the drawings, but the present invention is not limited to such an embodiment.

FIG. 1 is a perspective view showing components constituting the chamber 20 of the present invention. First, at least a plurality of branch holes 12 are provided on a side surface of the cylindrical member 11 at a position of a certain height. A branch pipe 13 for attaching a duct is provided in the branch hole 12. The other end of the duct 14 connected to the branch / branch 13 (not shown)
Are attached to exhaust holes provided in each chamber.

The number of branch holes 12 provided in the cylindrical member 11 is determined by the required number of ducts 14 to be connected. If the branch holes 12 are arranged at equal intervals at this time, the chamber 2
The air flow in the cylindrical member 1
Since it is symmetric with respect to the central axis of 1, the turbulence hardly occurs and the pressure loss can be reduced, which is preferable.

The diameter of the branch hole 12 is determined together with the diameter of the duct 14 according to the required displacement and the capacity of the fan. Further, the minimum value of the diameter of the cylindrical member 11 is uniquely determined by the diameter and number of the branch holes 12 to be formed and the minimum distance between the branch holes 12 desired in the process of manufacturing the chamber 20. On the other hand, if the diameter of the cylindrical member 11 is too large, the volume of the chamber 20 becomes large, so that the dead space is unnecessarily increased to increase the pressure loss, or the actual mounting space is increased by increasing the size of the chamber 20. There is a disadvantage such as being restricted. Therefore, the diameter of the cylindrical member 11 needs to be set to an appropriate value in consideration of such various factors.

Next, a conical bottom cover 15 having no bottom wall is sealed in an opening (lower surface) at one end of the cylindrical member 11 such that the conical apex faces the inside of the cylindrical member 11. And form the bottom of the chamber 20.
Here, the vertex 16 of the bottom cover 15 does not need to be a geometrically sharp corner, and may be a rounded corner with a chamfered corner.

On the other hand, a conical top lid 17 having no bottom wall is attached to the opening (upper surface) at the other end of the cylindrical member 11 so that the apex side faces the outside of the cylindrical member. Here, the apex portion of the upper lid 17 is cut out to attach the main branch pipe, and has a substantially trapezoidal cross section with an open upper surface.

Here, if the angles of the cone vertices of the upper lid 17 and the bottom lid 15 are equal, the dead space in the conical chamber 20 is reduced, and the occurrence of turbulence in the chamber 20 is also reduced. preferable. However, when the angle α of the conical vertex of the bottom lid 15 is extremely smaller than the angle β of the conical vertex of the upper lid, the flow path to the main branch pipe 18 is blocked by the conical vertex 16 of the bottom lid 15. Shape
It is not preferable because the pressure loss increases. Conversely, top lid 1
If the angle β of the apex of the cone 7 is extremely smaller than the angle α of the apex of the bottom lid 15, it is not preferable because the dead space is widened and the pressure loss tends to increase.

A main branch pipe 18 is provided on the upper opening of the upper lid 17.
The main duct 19 is attached to the main branch pipe 18, and the other end (not shown) of the main duct is connected to a fan.

FIG. 2 is a sectional view of a conical chamber 20 formed by joining the above-described members. In FIG. 2, the air flowing into the chamber 20 from the duct 14 flows toward the main branch pipe 18.
Is projected into the chamber 20, so that the air flowing from the respective ducts 14 is prevented from colliding with each other, and the inclined surface of the bottom cover 15 allows the air to flow into the main branch pipe 1.
It is rectified to flow to 8. As a result, compared with the conventional chamber 3 shown in FIG. 7, the occurrence of turbulence is small, and the pressure loss can be significantly reduced.

In order to maximize the rectification effect of the bottom cover 15, the position of the vertex 16 of the bottom cover 15 must be
It is preferable that the branch hole 12 is located closer to the upper lid 17 than the dotted line K indicating the height of the uppermost portion. However, even when the position of the apex portion 16 of the bottom lid 15 is below the dotted line K, the effect of reducing the pressure loss is recognized as compared with the conventional chamber 3. This is because a part of the flow of the air flowing from the duct 14 is rectified by the slope of the bottom cover 15 toward the main branch pipe 18. However, when the position of the apex 16 of the bottom lid 15 is set to be lower than the dotted line L indicating the height of the lowermost part of the branch hole 12, the pressure is lower than that of the conventional chamber 3. No remarkable effect of loss reduction is obtained. Hereinafter, the present invention will be described in more detail with reference to Examples.

[0022]

(Embodiment) FIG. 3 shows a two-sided view of an embodiment of a conical chamber 20 according to the present invention. Inner shape is 400
In a cylindrical member 11 having an outer diameter of 415 mm and a width (height) of 135 mm, branch holes 12 having a diameter of 86 mm were formed radially from the center axis of the cylinder at eight positions. Further, the outer shape for attaching the duct 14 to the cylindrical member 11 is 86 mm.
A branch pipe 13 having a diameter of 100 mm and a length of 100 mm was provided. The bottom lid 15 has a hem diameter of 400 mmφ and a height of 125 mm.
mm, and the top lid 17 has a hem diameter of 4 mm.
The one having a top opening of 123 mmφ and having a height of 100 mm was used. Further, a main branch pipe 18 having an outer diameter of 123 mm and a length of 80 mm was provided in the upper opening of the upper lid 17.

COMPARATIVE EXAMPLE As a comparative example, a rectangular parallelepiped chamber 3 having a rectangular flat bottom cover and a top cover having a side length of 350 mm as shown in FIG. 7 was used. The outer diameter is 86mm at 8 places in total, 2 places on each side of the chamber 3 side
A branch pipe 9 having a diameter of 80 mm and a length of 80 mm is attached to the center of the upper lid of the chamber 3. A main branch pipe 10 having a diameter of 123 mm and a length of 80 mm is provided.

FIG. 4 shows the results of measuring the magnitude of the pressure loss when the above-described example and comparative example were attached to the same fan and the flow rate was changed. FIG. 4 shows that the rate of increase of the pressure loss with respect to the flow rate is small in the embodiment of the present invention. For example, when the flow rate is 300 m ³ / hr, the comparative example of the conventional product has a pressure loss of about 7 mmAq, whereas the example of the present invention has a pressure loss of about 2.5 mmAq.
It can be seen that the pressure loss is reduced to about 1/3.

[0025]

As described above, according to the conical chamber of the present invention, the flow of the air flowing from each duct into the chamber can be guided to the main branch pipe without disturbing the flow, so that the pressure loss can be reduced. Play. Therefore, if the same fan is used while maintaining the advantages of the conventional chamber system, it is possible to increase the exhaust air volume and improve the ventilation capacity, while maintaining the same exhaust air volume as the conventional one. If desired, a fan having a small exhaust capacity can be used. Therefore, as compared with the related art, the facility cost and the power consumption of the fan are obtained by multiplying the pressure loss and the flow rate, so that there is a remarkable effect that the running cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing components of a conical chamber of the present invention.

FIG. 2 is a cross-sectional view of the conical chamber of the present invention.

FIG. 3 shows the structure of an embodiment of the conical chamber of the present invention, wherein (a) shows a plan view and (b) shows a side view.

FIG. 4 is a graph showing measurement results of pressure loss.

FIG. 5 is an explanatory view showing a pipe state of a merging pipe system.

FIG. 6 is an explanatory view showing a pipe state of a chamber system.

FIG. 7 shows the structure of a conventional chamber, (a) showing a plan view, and (b) showing a side view.

FIG. 8 is an explanatory view showing a flow of air in a conventional chamber.

[Explanation of symbols]

1 ... main duct, 2 ... fan, 3 ... chamber, 4 ...
Fan: 5: Main duct, 7: Box type container, 8: Branch hole, 9: Branch branch tube, 10: Main branch tube, 11: Cylindrical member,
12 ... branch hole, 13 ... branch and branch pipe, 14 ... duct, 15 ...
Bottom cover, 16: Apex of bottom cover, 17: Top cover, 18: Main branch pipe, 19: Main duct, 20: Chamber, A1 to A
5: supply / exhaust holes, B1 to B5: supply / exhaust holes, C1 to C5: duct, D: air flow, α: angle of the top of the bottom lid, β:
The angle of the top of the top lid.

Claims (4)

[Claims] At least a plurality of branch holes are formed in the side surface of a cylindrical member at the same height position, a branch pipe is disposed in the branch hole, and a bottom surface is formed in an opening at one end of the cylindrical member. A conical bottom lid having no wall is hermetically attached with the conical apex facing the inside of the cylindrical member, and an opening at the other end of the cylindrical member has a bottom wall. Not having a top cover with a substantially trapezoidal cross section having an upper surface opening with a conical apex cut off is attached such that the upper surface opening faces the outside of the cylindrical member, and is attached to the upper surface opening of the upper cover. Is a conical chamber characterized by being provided with a main branch pipe. 2. The conical chamber according to claim 1, wherein the angles of the apexes of the cones of the bottom lid and the top lid are equal. 3. The conical chamber according to claim 1, wherein the distance between the branch holes is constant. 4. The conical bottom lid according to claim 1, wherein a vertex of the conical bottom lid is located at a height closer to the upper lid than a lowermost part of the branch hole. The conical chamber as described.