JPH11257726A - Crossing duct unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cross two pieces of straight ducts in decided positions even in case that the height of ceiling is not enough. SOLUTION: A crossing duct can be obtained, in which ducts can be crossed with a limited height of ceiling unless two pieces of straight ducts are crossed in decided positions, by making the crossing duct unit main body 1 of a main duct 2 and a crossing duct 3, and providing the main duct 2 with a straight pipe 4 and a throttling part 5, and making the diameter of the straight pipe 4 smaller than two times of the diameter of the crossing duct 3, and also, arranging the crossing duct 3 to be vertical in the same plane as the main duct 2, and dividing the cross section area of the main duct 2 into two thereby crossing them.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cross duct unit of an air conditioner installed behind a ceiling and used for a duct for conveying air.

[0002]

2. Description of the Related Art Conventionally, a duct joint capable of performing a cross intersection similar to this type of cross duct unit is disclosed in Japanese Patent Application Laid-Open No. 9-492.
No. 1 is known.

Hereinafter, a duct joint capable of performing the crossing will be described with reference to FIG.

As shown in the figure, two circular cylindrical portions 101 and 102 forming an inlet side and an outlet side of a duct joint,
Two cross-section converters 103 and 104 for changing the cross-sectional shape from the circular cross-sections of the circular cylindrical portions 101 and 102 to a pseudo-elliptical cross-section, and a parallel portion 105 connecting between the two cross-section converters 103 and 104 Are connected in an airtight manner to each of the two circular cylindrical portions 101 and 10.
The two central axis lines 106 are on the same line and pass through the outside of the parallel portion 105 to the parallel portion 105 of one duct joint 107.
2A and the parallel section 105A that forms the cross section conversion sections 103A and 104A and connects the cross section conversion sections 103A and 104A.
And the parallel portion 105A of the duct joint 107A having the same central axis 106A as the central axis 106 is overlapped.

[0005]

In such conventional duct joints 107 and 107A capable of crossing each other, the circular cylindrical portions 101 and 102 at both ends and 101A and 102A and the parallel portions 105 and 105A are on the same line. However, there is a problem that a curved pipe duct is formed as a whole, and there is a problem that a flow path resistance is increased. Therefore, it is required to be able to use a straight pipe duct.

In addition, when piping is performed in a limited space above the ceiling, it is not possible to change the position of the intersection at the intersection due to obstacles and the like, and another member must be used. Therefore, it is required to reduce the number of duct members.

[0007] The present invention is to solve such a conventional problem, and can cross two straight ducts of a main duct and an intersection duct within a limited height above the ceiling. It is an object of the present invention to provide an intersection duct unit that can intersect by shifting the position of an intersection duct without increasing the number of duct members, and that can intersect without increasing pressure loss due to the intersection.

[0008]

In order to achieve the above object, an intersection duct unit according to the present invention increases the diameter of the main duct to be less than the sum of the diameters of the intersection ducts and increases the diameter of the intersection in the enlarged main duct. It is configured to penetrate a duct.

According to the present invention, there is provided an intersecting duct unit capable of intersecting two straight ducts of a main duct and an intersecting duct within a limited ceiling height.

Another means is that a connecting pipe is provided in the main duct, and an intersecting duct consisting of two pipes connected to the connecting pipe at shifted positions is provided.

According to the present invention, there is provided an intersecting duct unit capable of intersecting intersecting ducts at different positions without increasing the number of duct members.

Another means is that the main duct is divided into upper and lower parts so as to follow the outer shape of the intersecting duct.

According to the present invention, an intersection duct unit which can intersect without increasing the pressure loss due to the intersection is obtained.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention comprises a straight pipe portion, a main duct having throttle portions provided at both ends thereof, and an intersecting duct provided to intersect the main duct. A diameter smaller than twice the diameter of the intersection duct, a diameter of the constricted portion formed substantially equal to a diameter of the intersection duct, and the intersection duct intersects in a straight pipe portion of the main duct; Is provided through the straight pipe of the main duct, so the diameter of the main duct is the height of the duct at the intersection,
A straight duct can be used for the main duct and the cross duct, so that the flow path resistance can be reduced.

In the straight pipe portion of the main duct, there is provided a connecting pipe of a cross duct provided concentrically with the straight pipe section, and a cross duct composed of two pipes connected to the connecting pipe at shifted positions. When it is necessary to bend the duct due to obstacles when piping in a limited space behind the ceiling, piping can be shifted by displacing the position of the intersection duct, No need to use parts,
The number of construction steps can be prevented from increasing.

An upper curved duct and a lower curved duct are provided at a penetrating portion of the main duct penetrating the intersection duct so as to intersect with each other so as to form an air flow path outside the intersection duct. The sum of the cross-sectional areas of the upper curved duct and the lower curved duct is formed larger than the cross-sectional area of the main duct, and a predetermined air flow path is obtained at the intersection of the main duct and the cross duct, reducing the increase in pressure loss due to the cross. Can be prevented.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0018]

(Embodiment 1) As shown in FIG. 1, a cross duct unit main body 1 is formed of a main duct 2 and a cross duct 3, and the duct 2 is composed of a straight pipe portion 4 and throttle portions 5 provided at both ends thereof. Are provided. The diameter D1 of the straight pipe part 4 is the cross duct 3.
Is smaller than twice the diameter D2, and the diameter d1 on the smaller diameter side of the throttle portion 5 is formed to be equal to the diameter D2 of the intersection duct 3. The cross duct 3 is a straight pipe, is configured to be perpendicular to the main duct 2 on the same plane and perpendicular to the main duct 2, and to cross the cross section of the main duct 2 by dividing it into two.

In the above configuration, the wind flowing through the main duct 2 and the wind flowing through the cross duct 3 are separated by the cross duct unit main body 1.
And the ducts can cross each other without crossing the intersection duct 3 over the main duct 2, and the main duct 2 and the intersection duct 3 can use straight pipe ducts. Resistance can be reduced.

(Embodiment 2) As shown in FIG. 2, a connecting pipe 6 to which the cross duct 3A is connected concentrically with the straight pipe 4A is provided in the straight pipe 4A of the main duct 2A. Displaced in the longitudinal direction, an intersecting duct 3A composed of two tubes 3a and 3b is arranged substantially horizontally to form an intersecting duct unit main body 1A.

In the above configuration, when duct piping is performed behind the ceiling and there is an obstacle behind the ceiling and the duct needs to be bent to bend, a cross duct 3A consisting of two pipes 3a and 3b is connected to the connecting pipe. The pipe can be displaced through 6 so as not to hit an obstacle, and a bent pipe is not required, so that the number of duct members can be reduced and the number of construction steps can be prevented from increasing. .

(Embodiment 3) As shown in FIG. 3, a cross duct 3B is provided so as to form an air passage 7a outside a cross duct 3B at a penetrating portion of a main duct 2B penetrating the cross duct 3B. A lower curved duct 8 provided to form an upper curved duct 7 and an air flow path 8a is provided, and a cross-sectional area S1 of the upper curved duct 7 and a cross-sectional area S2 of the lower curved duct 8 are determined by a sectional area S of the main duct 2B. The cross duct unit main body 1B is formed so as to be larger.

In the above configuration, the wind flowing through the main duct 2B passes through the inside of the upper curved duct 7 and the lower curved duct 8 so as to straddle the cross duct 3B. Cross in.
At this time, S1 + S2, which is the sum of the cross-sectional area S of the main duct 2B, the cross-sectional area of the upper curved duct 7, and the cross-sectional area of the lower curved duct 8, is at least equivalently secured, and the two ducts are increased without increasing the pressure loss due to the intersection of the ducts Can be crossed.

[0024]

As is apparent from the above embodiment, according to the present invention, the main duct and the cross duct formed by the straight tubular duct are provided so that the cross ducts intersect in the main duct, so that the height is increased. And a cross duct unit having a low flow resistance and a low flow resistance can be provided.

Also, since the cross duct composed of two pipes is arranged at a shifted position on the connecting pipe provided in the main duct,
It is not necessary to use another member such as a bent pipe or the like, and it is possible to provide a cross duct unit having an effect of good workability.

Further, an upper curved duct and a lower curved duct which pass outside the intersection duct are provided at a portion of the main duct through which the intersection duct penetrates, and the cross-sectional area is formed larger than that of the main duct, so that pressure loss due to intersection can be prevented. An effective cross duct unit can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of a cross duct unit according to a first embodiment of the present invention.

FIG. 2 is a perspective view illustrating a configuration of a cross duct unit according to a second embodiment of the present invention.

FIG. 3 is a perspective view illustrating a configuration of a cross duct unit according to a third embodiment of the present invention.

FIG. 4 is a perspective view showing the configuration of a conventional duct joint capable of cross-crossing.

[Explanation of symbols]

 2 Main Duct 2A Main Duct 2B Main Duct 3 Cross Duct 3A Cross Duct 3B Cross Duct 3a Pipe 3b Pipe 4 Straight Pipe 4A Straight Pipe 5 Restrictor 6 Connection Pipe 7 Upper Curved Duct 7a Air Flow Path 8 Lower Curved Duct 8a Air Channel

Claims (3)

[Claims] 1. A main duct having a straight pipe portion and narrowed portions provided at both ends thereof, and a cross duct provided to intersect with the main duct, wherein a diameter of the straight pipe portion of the main duct is set to the diameter of the cross duct. An intersecting duct unit, wherein the intersecting duct is formed to be smaller than twice the diameter, the diameter of the constricted portion is substantially equal to the diameter of the intersecting duct, and the intersecting duct intersects within the straight pipe portion of the main duct. 2. A connecting pipe for a cross duct provided concentrically with said straight pipe section in a straight pipe section of said main duct, and a cross duct consisting of two pipes connected to said connecting pipe at shifted positions. The intersection duct unit according to claim 1 provided. 3. An upper curved duct and a lower curved duct provided at a penetrating portion of a main duct penetrating the cross duct so as to cross each other, so as to form an air flow path outside the cross duct. The sum of the cross-sectional areas of the upper curved duct and the lower curved duct is larger than the cross-sectional area of the main duct.
The described cross duct unit.