JPH09101056A - Branch-pipe device for connection in air-conditioning duct - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a branch-pipe device for connection in an air-conditioning duct which has a simple structure of a branch pipe being passed through holes opened in a main pipe fixed without the need for butting a branch pipe against a main pipe before jointing and fixing and which can be manufactured by a very easy process and inexpensively. SOLUTION: Through the circumferential wall of a main pipe 12 which is to be interposed in a duct for air for air conditioning holes are opened in opposition to each other to form a through hole. Through this through hole a branch pipe 16 is passed in a manner of one intersecting the other and fixed. Through the circumferential wall of the branch pipe at the part passed through the main pipe a first hole 18 by which the branch pipe communicates with the duct in the main pipe is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a branch pipe device for connecting an air-conditioning duct for branch-connecting a plurality of other outlets or the like to a flow path of conditioned air.

[0002]

2. Description of the Related Art Conventionally, when a plurality of outlets or the like are connected to an air conditioner or an air conditioning chamber to perform air conditioning while blowing out conditioned air into a room, air conditioning from these air conditioners or air conditioning chambers to each outlet is performed. The ducts are piped to supply conditioned air. However, if the air-conditioning ducts are individually installed at the outlets, the equipment cost will be high.
Therefore, as shown in FIG. 6, at outlets adjacent to each other, a branch pipe device is formed by connecting and fixing branch pipes in a T-shape or a cross shape to one main pipe and closing one end of the main pipe or the branch pipe. However, the main pipe of this branch pipe device is connected to one air conditioning duct that extends from the air conditioner or air conditioning chamber, and both ends of the branch pipe are connected to the connection ports of two adjacent outlets to save equipment costs. Construction is being done.

[0003]

However, in the above branch pipe apparatus, as shown in FIGS. 13 and 14, circular connection ports are formed on both sides of a cylindrical main pipe, and the connection ports are butt-shaped. A substantially circular beak-shaped connecting end must be processed on the branch pipe to be joined to, and the shape of the connecting port of the main pipe or the connecting end of the branch pipe is complicated and requires skill in processing. Further, in order to butt-join the connection port to this connection with high accuracy and fix it by welding or the like, the main pipe and the branch pipe are mounted crosswise on the upper surface of the pedestal etc. There is a problem in that a jig for abutting the connection end and temporarily fixing the jig is required, which is difficult to process and the manufacturing cost is high.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to eliminate the need to fix the connecting end of the branch pipe in a butt shape with respect to the hole of the main pipe, and to open the main pipe through the opening. The branch pipe can be held through the perforated hole and easily fixed by welding, etc. With a simple structure that has a communication hole in the part of the branch pipe that penetrates into the main pipe, it is easy to process and the manufacturing cost is low. It is to provide a branch pipe device for connecting an air conditioning duct.

[0005]

In order to achieve the above object, the invention according to claim 1 is provided with a main pipe 12 interposed in a flow path of conditioned air, and the main pipe 12 is provided at a position opposite to a peripheral side wall of the main pipe 12. The holes are opened to form the through holes 14, 14, and these through holes 1
The branch pipe 16 is fixed through the cross pipes 4 and 14, and the peripheral side wall portion of the branch pipe 16 that penetrates into the main pipe 12 is
The branch pipe device 10 for connecting an air conditioning duct is provided with a first communication hole 18 that communicates with the flow path of the main pipe 12.

Further, in the invention according to claim 2, either the main pipe 12 or the branch pipe 16 may be closed at either end to form a substantially T-shaped conduit 20.

In the invention according to claim 3, the first
The communication hole 18 may be a hole formed along the curved surface of the main pipe 12.

In the invention according to claim 4, the first
The communication hole 18 may be composed of a plurality of small holes 26.

Further, in the invention according to claim 5, the branch pipe 16 is an expansion and contraction adjusting pipe which is inserted into the inner surface side or the outer surface side of the end portion of the branch pipe so as to be slidable forward and backward or rotationally slidably. 28 may be provided.

Further, in the invention according to claim 6, the expansion and contraction adjusting pipe 2 inserted from the end of the branch pipe 16 to the inner surface side.
8a has a second communication hole 40 that is open to communicate with each other in the same shape as the first communication hole 18 provided in the branch pipe 16, and the branch pipe 16 of the expansion and contraction adjusting pipe 28a. It is also possible that the mutual communication opening of the first communication hole 18 and the second communication hole 20 can be adjusted by advancing / retreating sliding or rotating sliding.

[0011]

In the branch pipe device for connecting the air conditioning duct according to the first aspect of the present invention, the through-holes are opened at the opposite positions of the peripheral side wall of the main pipe, and the branch pipes are fixed through the through-holes in a cross shape. A first communication hole communicating with the flow path of the main pipe is provided in a peripheral side wall portion of the pipe penetrating into the main pipe.
Therefore, the branch pipe that penetrates the through hole of the main pipe can be stably held as it is and can be fixed by welding etc., and it is not necessary to prepare a locking jig for butting and fixing the main pipe and the branch pipe, and the processing is easy. Can be mass-produced at low cost. Also, in the ceiling space, the air-conditioning air flow path can be branched and connected to multiple outlets installed on the ceiling plate, and it is not necessary to connect the air-conditioning flow path to each outlet individually, and construction costs are greatly saved. It will be possible.

According to a second aspect of the present invention, either end of the main pipe or the branch pipe is closed to form a substantially T-shaped pipe passage. By connecting one end of the main pipe to the air-conditioning flow path, it is possible to inexpensively form a branch pipe path that is branched into a substantially T-shape in the air-conditioning flow path.

According to a third aspect of the present invention, the first communication hole is formed along the curved surface of the main pipe. When the conditioned air that has flowed through the main pipe flows into the branch pipe from the first communication hole, it is possible to prevent wind noise due to vortex flow and the occurrence of pressure loss of the conditioned air at the edge of the first communication hole.

According to the fourth aspect, the first communication hole is composed of a plurality of small holes. The opening ratio of these small holes to the peripheral wall surface of the branch pipe is large, so that the conditioned air flowing from the main pipe to the branch pipe is not biased to one side, and the wind noise does not occur while flowing on average. Further, the strength of the penetrating portion does not decrease, and the deformation or the like can be prevented.

According to a fifth aspect, the branch pipe is
An expansion / contraction adjusting tube is inserted on the inner surface side or the outer surface side of the end portion so as to be slidable forward / backward or rotationally slidably with respect to the branch pipe. Easily adjust the balance and distance between the branch pipe and other connection ports by connecting the expansion and contraction adjustment pipes to the connection port at the neck of the outlet installed facing each other while advancing and retracting or rotating and sliding. You can do it.

According to a sixth aspect of the invention, the expansion and contraction adjusting pipe inserted from the end of the branch pipe to the inner surface side communicates with each other in substantially the same shape as the first communication hole provided in the branch pipe. A second communication hole opened so that the first expansion / retraction slide of the expansion / contraction adjusting pipe moves forward or backward with respect to the branch pipe,
The mutual communication opening of the communication hole and the second communication hole can be adjusted. By sliding the expansion / contraction adjusting pipe forward / backward or rotating relative to the branch pipe, the communication opening of the second communication hole of the expansion / contraction adjusting pipe with respect to the first communication hole of the branch pipe is changed. The amount of air blown from both ends can be easily adjusted.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 5 show a branch pipe device (hereinafter, simply referred to as a branch pipe device) 10 for connecting an air conditioning duct according to an embodiment of the present invention. As is apparent from the figure, the branch pipe device 10 includes a main pipe 12 provided in a flow path of the conditioned air, and holes are formed at positions opposite to the peripheral side wall of the main pipe 12 to form through holes 14, 14. The branch pipe 16 is fixed through the through holes 14 and 14 in a cross shape, and the peripheral side wall portion of the branch pipe 16 penetrating into the main pipe 12 is connected to the flow path of the main pipe 12. A communication hole 18 is provided.

The main pipe 12 is a hollow cylindrical body made of a steel plate or the like. The branch pipe 16 is also made of a steel plate or the like, and is formed into a hollow cylindrical body having a smaller diameter than the main pipe 12. Through holes 1 for fixing the branch pipe 16 in a T-shape through both side walls near the end of the main pipe 12
4, 14 are perforated. The through holes 14, 14 are
In the state of the flat steel sheet before the main pipe 12 is bent into a tubular shape by a bending roll or the like, a through hole having a substantially elliptical shape is punched out and bent into a tubular shape to substantially match the outer shape of the branch pipe 16. 14 and 14 are formed.

By providing the through holes 14 and 14 in the main pipe 12, the branch pipe 16 can be stably held only by passing the branch pipe 16 through the through holes 14 and 14. The branch pipe 16 penetratingly held in the through holes 14, 14 does not separate from the main pipe 12, and the fixing work such as welding of the joint portion between the main pipe 12 and the branch pipe 16 can be performed very simply and accurately. Further, it is easy to manufacture the branch pipe device 10 in which the branch pipe 16 is branched from the main pipe 12 in a T shape, and mass production can be performed at low cost in a short time. In addition, the branch pipe 16 is formed with a connecting end having a complicated shape that is joined to the through holes 14 of the main pipe 12,
There is no need to use a locking jig or the like that mounts the main pipe 12 and the branch pipe 16 in an intersecting shape on the upper surface of the gantry or the like and accurately butts and locks the connection ends of the through hole 14 of the main pipe and the branch pipe 16. .

The first communication hole 18 provided in the peripheral side wall portion of the branch pipe 16 is formed so as to communicate with the inflow side of the conditioned air into the main pipe 12. As a result, the branch pipe 16 penetratingly supported by the through holes 14, 14 is slid forward and backward in the longitudinal direction thereof, and rotationally slide-adjusted around the longitudinal direction to adjust the first communication hole 18 to the air of the main pipe 12. The air can be accurately communicated with the inflow side, and the conditioned air can be allowed to flow from the main pipe 12 into the branch pipe 16 through the first communication hole 18 and be efficiently divided in both end directions.

An end of either the main pipe 12 or the branch pipe 16 is closed to form a substantially T-shaped branch pipe passage 20. In the embodiment, as shown in FIG. 4, a closing plate 22 is fixed and closed at an end opening of the main pipe 12 on the side of the branch pipe 16 which penetrates the main pipe 12. Thus, by connecting the main pipe 12 to the air-conditioning flow path, the conditioned air flowing in the air-conditioning flow path can be branched from the main pipe 12 to the branch pipe 16, thereby branching into a substantially T-shaped branch pipe. The path 20 can be easily formed. The end of the main pipe 12 is not limited to being closed, and one end of the branch pipe 16 communicating with the main pipe 12 in a cross shape may be closed to be used as a lateral T-shaped branch pipe line.

As shown in FIGS. 3 and 4, the first communication hole 18
Is formed in a hole substantially along the curved surface of the main pipe 12. In the embodiment, the first communication hole 18 is formed as a substantially hexagonal hole 24 opened in the side wall surface of the branch pipe 16 facing the inflow side of the main pipe 12 for the conditioned air. As a result, the main pipe 12
From the branch pipe 16 through the substantially hexagonal hole 24 of the branch pipe 16.
When the conditioned air flows into the inside, it is possible to prevent wind noise and pressure loss from occurring in the conditioned air flowing through while suppressing the generation of a vortex on the edge side of the first communication hole 18. The first communication hole 18 is not limited to the substantially hexagonal hole 24, but may be a polygonal hole such as an octagon or the like which is substantially along the curved surface of the main pipe 12, or a substantially circular hole. Even in
Similarly, it is possible to prevent wind noise and pressure loss due to the conditioned air flowing therethrough.

Further, as shown in FIG. 5, the first communication hole 1
8 may be formed by a plurality of small holes 26 opened in the peripheral side wall of the branch pipe 16 fitted in the main pipe 12. The plurality of small holes 26 are opened on the entire surface of the peripheral side wall of the branch pipe 16 fitted in the main pipe 12 with a predetermined gap, and each small hole 24 is formed.
The open area ratio of the total area of the holes to the peripheral side wall is larger than the open area ratio of the one hexagonal hole 24 to the peripheral side wall.

As a result, the conditioned air in the main pipe 12 can be evenly flowed through the small holes 24 into the branch pipe 16 and the generation of wind noise due to uneven flow can be prevented. In addition, the branch pipe 16
The main pipe 12 has a large hexagonal hole 24.
The strength is greater than that in the case where the hole is formed as the communication hole, and therefore the deformation of the penetrating portion can be prevented. Although the plurality of small holes 24 are circular holes in the above-described embodiment, the holes are not limited to this, and may be formed in a triangular hole, a quadrangular hole, a polygonal hole such as a hexagonal hole, and in this case. Also, the same effect can be obtained.

As shown in FIG. 2, FIG. 3 and FIG. 4, the branch pipe 16 has an expansion and contraction adjusting pipe 28 which is inserted into the inner surface or the outer surface of the end of the branch pipe 16 so as to be slidable forward or backward or slidably rotatable. I have it. The expansion and contraction adjusting pipe 28 is made of the same flat steel plate as the branch pipe 16, and is formed into a hollow cylindrical body that can be inserted into the inner surface side or the outer surface side of the end portion of the branch pipe 16. A packing 30 is provided on the joint surface between the expansion adjusting pipe 28 and the branch pipe 16 in order to maintain the airtightness of the internal conduit. In the embodiment, the expandable branch pipe 2 is provided on the inner surface side of the end of the branch pipe 16.
8 is inserted, and a packing 30 such as an O-ring formed of synthetic rubber, synthetic resin or the like is fitted on the inner surface side of the branch pipe 16.

Accordingly, the expansion and contraction adjusting pipe 28 is slid forward and backward with respect to the branch pipe 16 at the end of the branch pipe 16 and is connected to a connection port such as another blow port while connecting the branch pipe 16 and the other blow port. The balance with the connection port and the spacing can be easily adjusted. Although the expansion / contraction adjusting pipe 28 is provided on one end side of the branch pipe 16 in the embodiment, the expansion / contraction adjusting pipe 28 may be provided on the other end side as shown by a virtual line. .

Further, the expansion and contraction adjusting pipe 28 may be formed as an L-shaped pipe and provided at both ends of the branch pipe 16 so as to be expandable and contractible, so that one air conditioner can be provided to two linear outlets arranged in a straight line. Can be easily branched and connected from the flow path. Furthermore, the branch pipe 16
Is not limited to a straight hollow cylindrical body, but may be formed, for example, in a curved branch pipe that is curved in a substantially obtuse shape, and this may be fixed through the through hole of the main pipe. This makes it possible to easily branch and connect to the linear outlets installed in a cross shape on the ceiling surface.

Next, the branch pipe device 1 according to the embodiment of the present invention.
The operation of 0 will be described. The branch pipe device 10 is, for example,
As shown in FIG. 6, in the case where one air conditioning duct 35 extending from an air conditioner or an air conditioning chamber is branched and connected to the linear outlets 34, 34 installed opposite to each other on the upper surface side of the ceiling plate 32 in the ceiling space. To use. Then, the air conditioning duct 35
Is connected to one end of a main pipe 12 on the inflow side of the conditioned air of the branch pipe device 10, and one end of a branch pipe 16 penetratingly fixed to the main pipe 12 in a T-shape is provided at the neck portion of one linear outlet 34. It is inserted into the connection port 36 and the tape 38 is wrapped around the outer peripheral surface of the connection end of the branch pipe 16 to maintain airtightness. Next, the expansion / contraction adjusting pipe 28 inserted into the other end of the branch pipe 16 is attached to the branch pipe 1.
6 is slid forward and backward in the longitudinal direction, and the other linear outlet 34
The end portion of the expansion and contraction adjusting tube 28 is inserted into the connecting portion 36 of the neck portion of the above, and the tape 38 is wound around the outer peripheral surface of the connecting end to maintain airtightness.

Thus, one air-conditioning duct 35 extending from the air conditioner or the air-conditioning chamber can be easily branched and connected to the plurality of linear outlets 34, etc., which are installed opposite to each other, and the respective air outlets can be individually air-conditioned. No need to connect ducts, saving construction costs. Further, the branch pipe device 10 includes a main pipe 12
Since the branch pipe 16 is fixed through, it is not necessary to process a complicated connection port as compared with butt connection and fixation, or to weld and fix it while butt-holding it, and it is easy to manufacture and has high accuracy. It can be mass-produced at low cost in a short time.

A branch pipe device 10 according to another embodiment is shown in FIGS. 7, 8 and 9. This branch pipe device 10
Is a through hole formed in the main pipe 12 at a position facing the peripheral side wall of the main pipe 12 to form through holes 14 and 14.
4 and 14, and a branch pipe 16 that is fixed in a cross-like manner in a cross shape. A peripheral side wall portion of the branch pipe 16 that penetrates into the main pipe 12 has a first communication hole 1 that communicates with a flow path of the main pipe 12.
8 is provided, and the expansion and contraction adjusting pipe 28a inserted from the end portion of the branch pipe 16 to the inner surface side has substantially the same shape as the first communication hole 18 provided in the branch pipe 16 and can communicate with each other. The second communication hole 40 is opened, and the expansion and contraction adjusting pipe 28 is provided.
It is possible to adjust the mutual communication opening of the first communication hole 18 and the second communication hole 40 by advancing / retreating sliding or rotating sliding of the a with respect to the branch pipe 16.

In the structure of the branch pipe device 10 according to this embodiment, the same members as those of the branch pipe device of the previous embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. On the inner surface side of one end of the branch pipe 16, an expansion and contraction adjusting pipe 28 having a short length is inserted as in the previous embodiment. This expansion adjustment tube 2
8 slides forward and backward with respect to the branch pipe 16 while maintaining airtightness with a packing 30. Further, the other end of the branch pipe 16 is formed to be longer than the expansion and contraction adjustment pipe 28, and has an extension and contraction length that is at least capable of facing the first communication hole 18 of the branch pipe 16 while sliding forward and backward. The adjustment pipe 28a is inserted, and the expansion and contraction adjustment pipe 28a also slides forward and backward while maintaining airtightness with the packing 30 in the branch pipe 16.

The second communication hole 40 formed in the expansion / contraction adjusting pipe 28a has substantially the same shape as the first communication hole 18 formed in the branch pipe 16 in the previous embodiment. In the embodiment, as shown in FIG. 7, the first communication hole 18 is opened in the hexagonal hole 24, and the second communication hole 40 is also formed in the hexagonal hole 24 having the same shape. Accordingly, the expansion / contraction adjusting pipe 28a is slid forward / backward or rotationally slid with respect to the branch pipe 16, so that the communication opening portion of the second communication hole 40 of the expansion / contraction adjusting pipe 28a with respect to the first communication hole 18 of the branch pipe 16. Can be adjusted from a wide width to a narrow width, and the amount of air blown from both ends of the branch pipe 16 can be adjusted.

As shown in FIG. 10, when the expansion and contraction adjusting pipe 28a slides in the direction of arrow A, the first communication hole 24 and the second communication hole 4 are inserted.
The communication opening with 0 has a narrower width than that in the state of complete communication, and the communication holes are unevenly distributed in the direction of the arrow A sliding on the expansion and contraction adjusting pipe 28a. Therefore, as shown in FIG. The amount of air flowing in the direction of arrow A increases from the direction of arrow A. On the contrary, when the expansion / contraction adjusting pipe 28a is slid in the arrow A direction, the communication holes are unevenly distributed in the slid arrow A direction, and the amount of air flowing in the arrow A direction increases.

As shown in FIGS. 11 and 12, the first,
When the expansion and contraction adjusting pipe 28a is rotated around its longitudinal direction from the state in which the second communication holes 18 and 40 are completely communicated with each other, FIG.
As shown in FIG. 2, the communication hole is squeezed so that the amount of air blown from both ends of the branch pipe 16 can be adjusted to be small. In an embodiment,
First communication hole 18 provided in branch pipe 16 and expansion / contraction adjusting pipe 28
The second communication holes 40 provided in a are both formed as hexagonal holes 24, but not limited to this, they may be formed as polygonal holes such as octagons or substantially circular holes. Even in such a case, the branch amount of the conditioned air flowing through can be adjusted in the same manner.

The branch pipe device for connecting the air conditioning duct according to the present invention is not limited to the above-mentioned embodiment, and for example, the main pipe and the branch pipe may be formed as a rectangular cylinder. Any modifications may be made without departing from the essence of the invention described in the claims.

[0036]

As described above, according to the first aspect of the present invention,
According to the branch pipe device for air-conditioning duct connection according to the above, the main pipe provided in the flow path of the conditioned air is provided, the holes are formed at the positions opposite to the peripheral side wall of the main pipe to form the through holes, and the through holes are formed. The branch pipe is fixed through the hole in a cross shape, and the peripheral side wall portion of the branch pipe penetrating into the main pipe is provided with the first communication hole communicating with the flow path of the main pipe. By simply penetrating the branch pipe into the through hole opened at the opposite position, the joint part can be easily fixed by welding etc. while stably holding the branch pipe with respect to the main pipe, easy to manufacture, inexpensive in a short time and in large quantities. Can be produced. In addition, a branch pipe may be formed with a complicated-shaped connection port that joins the through hole opened in the main pipe, or the main pipe and the branch pipe may be mounted in a cross shape on the top surface of a pedestal, etc. It is not necessary to use an auxiliary jig or the like that accurately butts and locks the connection port of the pipe.

According to a second aspect of the present invention, either the main pipe or the branch pipe is closed at its end to form a substantially T-shaped pipe line, thereby connecting the main pipe to the air-conditioning flow path. As a result, it is possible to inexpensively form the branch pipe line that is branched into a substantially T-shape in the air conditioning flow path.

According to the third aspect, the first communicating hole is formed along the curved surface of the main pipe, so that the first communicating hole flows from the main pipe to the branch pipe through the first communicating hole of the branch pipe. The sound produced by the air is quiet and pressure loss is small.

Further, according to the fourth aspect, since the first communication hole is composed of a plurality of small holes, the air in the main pipe can flow to the branch pipes evenly, so that a wind noise is generated. In addition, it is possible to prevent deformation and the like without lowering the strength of the penetrating portion.

According to a fifth aspect, the branch pipe is
By providing an expansion / contraction adjusting tube inserted into the branch pipe on the inner surface side or the outer surface side of the end portion so as to be slidable forward / backward or rotationally slidable, the expansion / contraction adjusting tube is expanded / contracted and the branch pipe and other Easily adjust the balance with the connection port and adjust the spacing.

Further, according to claim 6, the expansion and contraction adjusting pipe inserted from the end portion of the branch pipe to the inner surface side communicates with each other in substantially the same shape as the first communication hole provided in the branch pipe. A second communication hole opened so that the first communication hole and the second communication hole can be adjusted by advancing / retreating and rotating sliding the expansion / contraction adjusting pipe with respect to the branch pipe. By enabling the expansion / contraction adjustment tube to slide forward / backward or rotationally with respect to the branch tube, the width of the communication opening of the second communication hole of the expansion / contraction adjustment tube with respect to the first communication hole of the branch tube is adjusted. While adjusting the amount of air blown out from the branch pipe.

[Brief description of the drawings]

FIG. 1 is a perspective view of a branch pipe device for connecting an air conditioning duct according to an embodiment of the present invention.

FIG. 2 is a plan view of a branch pipe device for connecting an air conditioning duct shown in FIG.

3 is a front view of the branch pipe device for connecting the air conditioning duct shown in FIG. 1. FIG.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a front view of a branch pipe device for connecting an air conditioning duct, showing a case where the first communication hole of the branch pipe is a plurality of small holes.

FIG. 6 is a perspective view showing a state in which a branch pipe device is connected to an air conditioning duct and is branched and connected to two linear outlets.

FIG. 7 is a front view of a branch pipe device for air conditioning duct connection according to another embodiment capable of adjusting the amount of air to be branched and blown while adjusting the communication holes of the branch pipe and the expansion and contraction adjusting pipe to communicate with each other.

8 is a plan view of the branch pipe device for connecting the air conditioning duct shown in FIG. 7. FIG.

9 is a sectional view taken along line BB in FIG.

10 is a cross-sectional explanatory view of a state in which the expansion and contraction adjusting tube shown in FIG. 7 has been moved.

11 is a cross-sectional view taken along the line CC of FIG.

12 is a cross-sectional explanatory view of a state in which the expansion and contraction adjusting tube shown in FIG. 11 is rotated around the longitudinal direction.

FIG. 13 is a perspective explanatory view of a state in which the branch pipe is abutted against the main pipe in the conventional T-shaped branch pipe device.

14 is a cross-sectional view of the T-shaped branch pipe device shown in FIG.

[Explanation of symbols]

 10 Branch pipe device for air conditioning duct connection 12 Main pipe 14 Through hole 16 Branch pipe 18 First communication hole 20 Branch pipe line 26 Small hole 28 Expansion / contraction adjustment pipe 28a Expansion / contraction adjustment pipe 40 Second communication hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Shigeaki Okabe, inventor 4-1-1-13 Honmachi, Chuo-ku, Osaka Stock company Takenaka Corporation Osaka Main store (72) Inventor Yukio Kuno 1034 Wada, Kazuya-gun, Shinoguri-machi, Fukuoka Prefecture -4 Inside Kyoritsu Airtech Co., Ltd. (72) Inventor Shinichi Abe 1034 Wada, Shinoguri-machi, Kasuya-gun, Fukuoka Prefecture Inside Kyoritsu Airtech Co., Ltd.

Claims (6)

[Claims] 1. A main pipe provided in a flow path of conditioned air, wherein a hole is opened at a position opposite to a peripheral side wall of the main pipe to form a through hole, and a branch pipe is crossed through these through holes. A branch pipe device for connecting an air conditioning duct, wherein a first communication hole that is fixed and that communicates with a flow path of the main pipe is provided in a peripheral side wall portion of the branch pipe that penetrates into the main pipe. 2. The branch pipe apparatus for connecting an air conditioning duct according to claim 1, wherein either end of the main pipe or the branch pipe is closed to form a substantially T-shaped pipe line. 3. The branch pipe device for connecting an air conditioning duct according to claim 1, wherein the first communication hole is a hole formed along a curved surface of the main pipe. 4. The branch pipe device for connecting an air conditioning duct according to claim 1, wherein the first communication hole comprises a plurality of small holes. 5. The expansion pipe is provided with an expansion / contraction adjusting pipe inserted in an inner surface side or an outer surface side of an end portion of the end pipe so as to be slidable forward and backward or slidably rotatable with respect to the branch pipe. A branch pipe device for connecting an air conditioning duct according to any one of 1. 6. The expansion / contraction adjusting pipe inserted from the end portion of the branch pipe to the inner surface side is opened so as to be able to communicate with each other in substantially the same shape as the first communicating hole provided in the branch pipe. Second
The air-conditioning system according to claim 5, further comprising a communication hole, wherein the first communication hole and the second communication hole can be adjusted to communicate with each other by advancing and retracting or rotating and sliding the expansion-contraction adjusting pipe with respect to the branch pipe. Branch pipe device for connecting ducts.