JPH0656596U - T-shaped branch pipe - Google Patents

Abstract

(57) [Summary] [Object] To provide a T-shaped branch pipe in which an air flow transferred from a main pipe diverts into a smooth without causing turbulence at a diversion point. In a T-shaped branch pipe for dividing the gas transferred from the main pipe 1 into the branch pipes 2 and 3, the inner surface portion of the branch pipe where the gas transferred from the main pipe 1 collides and splits is projected in a conical shape 6. Is a T-shaped branch pipe.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a branch pipe for a duct. More specifically, the present invention relates to a T-shaped branch pipe having a smooth gas flow.

[0002]

[Prior art]

 Ducts for transferring gas are often used for air conditioning and heating in buildings and factories. In particular, in recent years, it has been required for ducts to be able to reduce the pressure loss and send the air volume as designed by the air conditioning designer. On the other hand, since it is necessary to distribute gas throughout the building or factory, ducts will be installed using various types of joints and branch pipes. At this time, branch pipes of various shapes are used. The T-shaped branch pipe is one of them. FIG. 2 shows a conventional T-shaped branch pipe. The gas enters from the main pipe 1 and splits into the branch pipes 2 and 3 as shown by the arrows. At this time, a turbulent flow a occurs at the branch point. The form of the turbulent flow a changes depending on the strength of the pressure of the supplied gas, which changes the pressure loss, which makes it difficult to obtain the required air flow as designed.

[0003]

[Problems to be solved by the device]

 The inventor of the present invention aims to solve the above-mentioned problems of the conventional T-shaped branch pipe, and to provide a T-shaped branch pipe in which the airflow does not generate turbulence at the branch point and is smoothly branched. And

[0004]

[Means for Solving the Problems]

 That is, the present invention is a T-shaped branch pipe characterized in that the inner surface portion of the branch pipe where the gas transferred from the main pipe collides and splits is conically projected. The present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view showing an example of a T-shaped branch pipe of the present invention. In this example, the blind cloth tube is modified to create the T-shaped branch tube of the present invention. In FIG. 1, 1 is a main pipe and 2 and 3 are branch pipes. Reference numeral 4 denotes a cut residual portion of the main pipe of the cross pipe (cross pipe). Reference numeral 5 is a blind cover that covers the rest of the tube. Reference numeral 8 is a spot weld for fixing the fitting portion of the blind cover 5 to the pipe cutting remainder 4. Therefore, in the present invention, the inner surface 6 of the blind cover 5 is made to project in a conical shape. 7 is the apex of the cone. The air flow transferred from the main pipe 1 hits the conical portion 6 on the inner surface of the blind cover 5, and is uniformly divided into left and right, so that no turbulent flow occurs and the flow is extremely smooth.

In the above example, the conical portion is formed using the blind cover, but the conical portion may be formed by any means. For example, in a conventional T-shaped branch pipe as shown in FIG. 2, the inner surface portion of the branch pipe where the gas transferred from the main pipe collides and splits may be formed by a press or the like so as to project in a conical shape. Further, in FIG. 1, a circular through hole may be formed at the top of the main pipe 1 in the branch pipes 2 and 3, and the conical portion 6 on the cone may be directly welded to the circular through hole. The angle of the top of the cone of the cone is not particularly limited, but is preferably about 100 ° to 150 °.

[0006]

[Effect of device]

 In the present invention, in the T-shaped branch pipe for the duct, the inner surface portion of the branch pipe, in which the gas transferred from the main pipe collides and splits, is projected in a conical shape, so that the airflow from the main pipe is smoothly divided in the conical portion. It flows to the branch pipe and does not generate turbulence at the branch point. Therefore, there is no pressure loss during gas transfer, and it is possible to deliver the air volume as designed by the air conditioning designer.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a T-shaped branch pipe according to the present invention.

FIG. 2 is a vertical sectional view of a conventional example of a T-shaped branch pipe.

[Explanation of symbols]

 1 Main pipe 2, 3 Branch pipe 5 Blind cover 6 Cone

Claims (1)

[Scope of utility model registration request] 1. A T characterized by having a conical shape projecting from the inner surface of a branch pipe where the gas transferred from the main pipe collides and splits.
Shaped branch pipe.