Pipe connection structure

Patent metadata

Field	Value
Publication number	US-2018119605-A1
Application number	US-201515569108-A
Country	US
Kind code	A1
Filing date	Nov 9, 2015
Priority date	Nov 9, 2015
Publication date	May 3, 2018
Grant date	—

Abstract

A pipe connection structure according to an embodiment of the present invention includes: two inlet pipes through which a gas is capable of flowing; a connection pipe to which respective outlet-side end portions of the two inlet pipes are connected at a distance; and an outlet pipe connected to the connection pipe at an opposite side to a side where the two inlet pipes are connected to the connection pipe, the outlet pipe being capable of being in communication with the two inlet pipes via a space section inside the connection pipe. The two inlet pipes include a first inlet pipe disposed on a first side and a second inlet pipe disposed on a second side, in a width direction of the connection pipe, across a middle of connection positions of the two inlet pipes to the connection pipe. The outlet pipe is connected to a position offset toward the second side in the width direction of the connection pipe. Along an axial direction of the first inlet pipe, the space section inside the connection pipe has an axial length not smaller than a virtual diameter D defined by following expression (1) D=√(4A/π), where A is a cross-sectional area of the first inlet pipe and π is pi.

First claim

1 - 8 . (canceled)

9 . A pipe connection structure, comprising:
two inlet pipes through which a gas is capable of flowing; a connection pipe to which respective outlet-side end portions of the two inlet pipes are connected at a distance; and an outlet pipe connected to the connection pipe at an opposite side to a side where the two inlet pipes are connected to the connection pipe, the outlet pipe being capable of being in communication with the two inlet pipes via a space section inside the connection pipe, wherein the two inlet pipes include a first inlet pipe disposed on a first side and a second inlet pipe disposed on a second side, in a width direction of the connection pipe, across a middle of connection positions of the two inlet pipes to the connection pipe, wherein the outlet pipe is connected to a position offset toward the second side in the width direction of the connection pipe, and wherein, along an axial direction of the first inlet pipe, the space section inside the connection pipe has an axial length not smaller than a virtual diameter D defined by following expression (1):
D =√(4 A /π)   (1)

where A is a cross-sectional area of the first inlet pipe and π is pi.

10 . A pipe connection structure, comprising:
two inlet pipes through which a gas is capable of flowing; a connection pipe to which respective outlet-side end portions of the two inlet pipes are connected at a distance; and an outlet pipe connected to the connection pipe at an opposite side to a side where the two inlet pipes are connected to the connection pipe, the outlet pipe being capable of being in communication with the two inlet pipes via a space section inside the connection pipe, wherein the two inlet pipes include a first inlet pipe disposed on a first side and a second inlet pipe disposed on a second side, in a width direction of the connection pipe, across a middle of connection positions of the two inlet pipes to the connection pipe, wherein the outlet pipe is connected to a position offset toward the second side in the width direction of the connection pipe, and wherein an axial length of the space section inside the connection pipe, along an axial direction of the first inlet pipe, is not less than 50% of a length between a connection position at which the first inlet pipe is connected to the connection pipe and a connection position at which the outlet pipe is connected to the connection pipe, along the axial direction of the first inlet pipe.

11 . The pipe connection structure according to claim 9 ,
wherein an inner wall forming the space section inside the connection pipe includes a top-portion inner wall to which the outlet pipe is connected and which is disposed between the outlet pipe and the first inlet pipe, and a curved portion curved in an arc shape and protruding into the space section is formed on the top-portion inner wall.

12 . The pipe connection structure according to claim 11 ,
wherein the curved portion has an inner wall forming the curved portion, and a part of the inner wall on a side of the outlet pipe is formed on a position adjoining to an inner wall of the outlet pipe on a side of the curved portion.

13 . The pipe connection structure according to claim 11 ,
wherein the curved portion extends in a direction substantially orthogonal to a moving direction of the gas flowing toward the outlet pipe via the space section inside the connection pipe from the first inlet pipe.

14 . The pipe connection structure according to claim 9 ,
wherein the first inlet pipe is applied to a high-pressure side turbine lead-out passage for leading out exhaust gas discharged from a turbine of a high-pressure turbo in a two-stage supercharging system including the high-pressure turbo and a low-pressure turbo connected to each other in series, wherein the second inlet pipe is applied to a high-pressure side turbine bypass passage which bypasses the turbine of the high-pressure turbo, wherein the outlet pipe is applied to a low-pressure side turbine introduction passage for introducing the exhaust gas to a turbine of the low-pressure turbo, and wherein the high-pressure side turbine lead-out passage, the high-pressure side turbine bypass passage, and the low-pressure side turbine introduction passage are connected to the connection pipe.

15 . The pipe connection structure according to claim 9 ,
wherein the first inlet pipe is applied to a high-pressure side compressor lead-out passage for leading out intake gas from a compressor of a high-pressure turbo in a two-stage supercharging system including the high-pressure turbo and a low-pressure turbo connected to each other in series, wherein the second inlet pipe is applied to a high-pressure side compressor bypass passage which bypasses the compressor of the high-pressure turbo, wherein the outlet pipe is applied to a supply air introduction passage for introducing the intake gas to an engine of the two-stage supercharging system, and wherein the high-pressure side compressor lead-out passage, the high-pressure side compressor bypass passage, and the supply air introduction passage are connected to the connection pipe.

16 . The pipe connection structure according to claim 9 ,
wherein the first inlet pipe and the second inlet pipe are configured such that the gas flows selectively through only one of the first inlet pipe or the second inlet pipe.

Assignees

• Mitsubishi Heavy Ind Ltd

Inventors

• Iwakiri Kenichiro

Classifications

• F02M35/10157

  Supercharged engines · CPC title

• F02M35/10091

  characterised by details of intake ducts: shapes; connections; arrangements (ducts within or on the plenum chamber F02M35/10039) · CPC title

• F02B37/18 Primary

  by bypassing exhaust {from the inlet to the outlet of turbine or to the atmosphere} · CPC title

• F02B37/013

  with exhaust-driven pumps arranged in series · CPC title

• F16L41/02

  Branch units, e.g. made in one piece, welded, riveted · CPC title