JP-2026074517-A - Piping for combustion equipment

Abstract

[Problem] To provide a technology that can suppress the generation of detonation while ensuring sufficient gas flow rate. [Solution] In a piping system for supplying gas to a combustion device, the piping comprises a wall extending in the axial direction of the piping, and a plurality of partitioned flow paths, each partitioned by the wall, through which gas flows. In a cross-section perpendicular to the direction of gas flow in the piping, the maximum dimensions in each region of the plurality of partitioned flow paths are less than or equal to the size of the detonation cell. [Selection Diagram] Figure 1

Inventors

• 梶本 哲也
• 大塚 啓太

Assignees

• トヨタ自動車株式会社

Dates

Publication Date

20260507

Application Date

20241021

Claims (1)

1. A pipe for supplying gas to a combustion device, Within the aforementioned pipe, a wall portion extending in the axial direction of the pipe, The inside of the piping is defined by the wall portion, and comprises a plurality of partitioned flow paths through which the gas flows, A pipe in which, in a cross-section perpendicular to the gas flow direction, the maximum dimension in each of the multiple partitioned flow path regions is less than or equal to the detonation cell size.

Description

This disclosure relates to piping for combustion equipment. Techniques for suppressing detonation in piping that supplies gas to a combustion device are known. For example, Patent Document 1 discloses a flame arrestor comprising a disc and multiple ring-shaped plates arranged sequentially upstream of the flow path. Within the piping, all gas flows downstream through slits between adjacent ring-shaped plates and along the outer circumference of the disc. Patent Document 1 cites 0.1 mm as an example of a slit width. Japanese Patent Publication No. 2005-308230 This is a diagram illustrating the piping system.This is a schematic cross-sectional view showing the axial cross-section of the piping.This is a schematic cross-sectional view showing a cross-section perpendicular to the gas flow direction of the main part in the modified example. A. First embodiment: Figure 1 is an explanatory diagram of piping 100 in one embodiment of the present disclosure. Figure 2 is a schematic cross-sectional view showing the axial cross-section of piping 100. In this embodiment, piping 100 is connected to a combustion device and supplies gas to the combustion device. The gas is a flammable gas. Piping 100 comprises a main section 10 having a wall section 11 and a plurality of partitioned flow path sections 12, and a joint section 20. The main section 10 is the portion of the piping 100 where a partitioned flow path section 12 is formed by the wall section 11. In this embodiment, the main section 10 is composed of multiple small-diameter pipes, each thinner than the joint section 20. The number of small-diameter pipes is determined by the desired flow rate of the combustible gas supplied to the combustion device. The wall portion 11 is a part that extends axially along the pipe 100. The wall portion 11 divides the inside of the pipe 100 in a direction perpendicular to the axial direction. In this embodiment, the wall portion 11 is a wall constituting a small-diameter pipe. Furthermore, the wall portion 11 constitutes the outer shape of the pipe 100 in the main portion 10. The partitioned flow path section 12 is a flow path defined and formed by partitioning the inside of the piping 100 by the wall section 11. A flammable gas flows through the partitioned flow path section 12. In this embodiment, the partitioned flow path section 12 is the space within each small-diameter pipe. In a cross-section perpendicular to the gas flow direction in the piping 100, the maximum dimension in each region of the multiple partitioned flow channels 12 is less than or equal to the detonation cell size. The maximum dimension is the maximum value obtained by measuring along any direction perpendicular to the axial direction of the piping 100 within the region of each partitioned flow channel 12. The detonation cell size is the width of the cell formed by detonation. The detonation cell size is determined by the type of flammable gas and the mixing ratio with air or oxygen desired by the combustion device. In this embodiment, the partitioned flow channels 12 are flow channels formed by small-diameter piping with an inner diameter L1 less than or equal to the detonation cell size. The inner diameter L1 is, for example, 15 mm. It is preferable that the inner diameter L1 is at least half the size of the detonation cell size to ensure sufficient flow rate for the flammable gas. The joint section 20 is a portion of the piping 100 that is not partitioned by the wall section 11, and is the point where multiple partitioned flow channels 12 converge. The axial length L2 of the joint section 20 is longer than the axial length of the main section 10. The axial length L2 of the joint section 20 is, for example, 300 mm or more and 500 mm or less. In this embodiment, the joint section 20 is a short pipe that can accommodate the ends of all small-diameter pipes in the radial direction. The main section 10 and the joint section 20 are connected by welding or a sealing member (not shown) to prevent leakage of flammable gas. Furthermore, the joint sections 20 are provided at both ends of the piping 100. That is, the joint sections 20 are provided at both ends of the main section 10. Therefore, the flammable gas supplied from the outside flows through the joint sections 20, then branches into multiple partitioned flow channels 12, and finally rejoins at the joint sections 20 before flowing into the combustion device. As described above, the piping 100 of this embodiment allows for a greater gas flow rate compared to a configuration with a plate-like structure perpendicular to the axial direction of the piping 100, because the wall portion 11 that partitions the multiple partitioned flow path sections 12 extends along the axial direction of the piping 100. Furthermore, since the maximum dimensions in each region of the multiple partitioned flow path sections 12 are less than or equal to the detonation cell size, the occurrence of detonation can be suppressed. Therefore,