JP2017048700A - Exhaust pipe connection structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exhaust pipe connection structure which can inhibit high-temperature exhaust gas and low-temperature exhaust gas from forming biased flows, respectively, in a connection part which is exposed to the high-temperature exhaust gas and the low-temperature exhaust gas at the same time.SOLUTION: An exhaust pipe connection structure is for connecting one or plural high-temperature exhaust pipes A, through which exhaust gas of higher temperature passes, and one or plural lower-temperature exhaust pipes B, through which exhaust gas of lower temperature passes, to one exhaust pipe C via a flange and a gasket. In the exhaust pipe connection structure, at least one high-temperature exhaust pipe A and at least one lower-temperature exhaust pipe B are inclined, at least at outlet portions, relative to a line perpendicular to the flange surface, downward by an angle which is larger than 0° and smaller than 60° and/or leftward or rightward by an angle which is larger than 0° and smaller than 30°.SELECTED DRAWING: Figure 1

Description

  In the present invention, when a high-temperature exhaust pipe from which a higher-temperature gas is exhausted and a low-temperature exhaust pipe from which a lower-temperature gas is exhausted are connected to one exhaust pipe, the exhaust gas is less likely to cause uneven heat at the connection portion. It relates to a pipe connection structure.

  In an internal combustion engine using a turbocharger or the like, a high-temperature exhaust pipe from which higher-temperature gas is exhausted and a low-temperature exhaust pipe from which lower-temperature gas is exhausted are combined into one exhaust pipe using a flange and a gasket. May connect.

  In an exhaust pipe connection structure in which a high temperature exhaust pipe from which higher temperature gas is exhausted and a low temperature exhaust pipe from which lower temperature gas is exhausted are connected to one exhaust pipe, the side close to the high temperature exhaust pipe is exclusively heated. As a result of exposure, members near the connection (eg, gaskets, flanges, or exhaust pipes) or other exhaust pipes or members that are further connected to the exhaust pipe may be significantly degraded in part. Further, the gas from the high temperature exhaust pipe easily passes through the upper side, and the gas from the low temperature exhaust pipe easily passes through the lower side. For this reason, in the exhaust pipe, a laminar flow of a high-temperature gas and a low-temperature gas is likely to be formed, and this also means that a member near the connection part or another exhaust pipe or member further connected to the exhaust pipe is partially Cause significant deterioration. For this reason, in a connection structure in which a high-temperature exhaust pipe and a low-temperature exhaust pipe are combined and connected to one exhaust pipe, it is desired to suppress uneven heat.

  Furthermore, in an internal combustion engine or the like using a turbocharger or the like, from a low temperature exhaust pipe, for example, about 200 to 300 ° C. In some cases, a gas having a high temperature of about 800 to 1000 ° C. and a high pressure of several hundred atmospheres may be exhausted alternately. That is, in the exhaust pipe connection structure described above, a member near the connection portion may be repeatedly exposed to a high temperature environment and a low temperature environment, which also causes deterioration of the member near the connection portion.

  The present invention suppresses the high temperature exhaust and the low temperature exhaust from forming a biased flow in the connection part exposed to the high temperature exhaust gas and the low temperature exhaust gas at the same time, thereby suppressing the partial deterioration of the members near the connection part. It is an object of the present invention to provide an exhaust pipe connection structure that can be used.

The present invention
One or more hot exhaust pipes A through which higher temperature exhaust passes and one or more cold exhaust pipes B through which lower temperature exhaust passes are connected to one exhaust pipe C through a flange and a gasket. Exhaust pipe connection structure
The flange is arranged such that the flange surface forms an angle α of 0 ° to 75 ° with a plane parallel to the direction in which gravity acts.
When the flange surface is tilted by an angle α so that it is parallel to the direction in which gravity acts, the direction in which gravity acts on the flange surface is downward, and the direction perpendicular to the direction in which gravity acts is the left-right direction In addition,
At least one hot exhaust pipe A at least at the outlet portion, with respect to a line perpendicular to the flange surface, at an angle of greater than 0 ° and less than or equal to 60 ° and / or left or right, from 0 ° Is inclined at an angle of not more than 30 ° and / or at least one cold exhaust pipe B is at least at the outlet portion, upwards from 0 ° and not more than 60 ° with respect to a line perpendicular to the flange surface And / or tilted at an angle greater than 0 ° and less than or equal to 30 ° to the left or right.
An exhaust pipe connection structure is provided.

  The exhaust pipe connection structure of the present invention is such that the path of the gas discharged from the high temperature exhaust pipe A and the low temperature exhaust pipe B is inclined from a line perpendicular to the flange surface. Mixing with the exhaust is promoted, and the high-temperature exhaust and the low-temperature exhaust are alleviated from concentrating on the upper and lower portions in the exhaust pipe C, respectively. Therefore, according to the exhaust pipe connection structure of the present invention, a member (particularly a gasket) in the vicinity of the connection portion or exhaust gas caused by continuous or intermittent exposure to a gas having a high temperature and sometimes a high pressure. Deterioration of members connected to the tube C can be suppressed, and these members can be used over a long period of time.

It is an elevation sectional view of the exhaust pipe connection structure concerning one embodiment of the present invention. It is sectional drawing which cut | disconnected the exhaust pipe connection structure which concerns on one Embodiment of this invention in the left-right direction. It is a schematic diagram which shows arrangement | positioning of the exit part of the high temperature exhaust pipe A and the low temperature exhaust pipe B of the exhaust pipe connection structure which concerns on one Embodiment of this invention. (A) And (b) is a schematic diagram which respectively shows arrangement | positioning of the high temperature exhaust pipe A and the low temperature exhaust pipe B of the exhaust pipe connection structure which concerns on one Embodiment of this invention. It is a schematic diagram which shows arrangement | positioning of the high temperature exhaust pipe A and the low temperature exhaust pipe B of the exhaust pipe connection structure which concerns on one Embodiment of this invention. (A) And (b) is a schematic diagram which respectively shows arrangement | positioning of the high temperature exhaust pipe A and the low temperature exhaust pipe B of the exhaust pipe connection structure which concerns on one Embodiment of this invention. It is an elevation sectional view of the exhaust pipe connection structure concerning one embodiment of the present invention.

  An embodiment of the present invention will be described with reference to the drawings. In addition, all drawings are schematic diagrams, and each component is not necessarily displayed with the same scale for easy understanding. In addition, in the plurality of drawings, elements denoted by the same reference numerals are elements having the same function.

  As described above in the section “Problems to be Solved by the Invention”, the exhaust from the high-temperature exhaust pipe A through which the exhaust having a higher temperature and possibly high pressure (hereinafter simply referred to as “high-temperature exhaust”) passes. The exhaust and the exhaust from the low-temperature exhaust pipe B through which the low-temperature and possibly high-pressure exhaust passes are supplied to one exhaust pipe C, and the exhaust is collectively discharged from the one exhaust pipe. There are things to do. In such a case, the outlets of the high temperature exhaust pipe A and the low temperature exhaust pipe B need to be connected to the exhaust pipe C, and the flanges and gaskets used at the connection portions are exposed to the high temperature exhaust and the low temperature exhaust. It will be. When the direction in which the gravity acts is downward, the exhaust pipe C is arranged perpendicular to the vertical direction, and when high temperature exhaust and low temperature exhaust are supplied into the exhaust pipe C, the high temperature exhaust generally passes through the upper side. The low temperature exhaust gas tries to pass through the lower side, and two laminar flows of exhaust gas are formed in the exhaust pipe C. Therefore, the upper part of the flange and the gasket are exclusively exposed to a high temperature, and the deterioration tends to further progress at the upper part.

  In order not to deteriorate only the upper part of the flange and the gasket, it is preferable that the high temperature exhaust and the low temperature exhaust do not form a laminar flow, but the high temperature exhaust and the low temperature exhaust mix to form an intermediate temperature exhaust. Therefore, in this embodiment, mixing of laminar flow is promoted so that high-temperature exhaust and low-temperature exhaust hardly form a laminar flow in the exhaust pipe C, or even if high-temperature exhaust and low-temperature exhaust form a laminar flow. Alternatively, by appropriately setting the direction of the high-temperature exhaust and the low-temperature exhaust so that the influence of these laminar flows on the exhaust pipe C can be reduced, and / or by mixing the high-temperature exhaust and the low-temperature exhaust, the exhaust pipe C An exhaust pipe connection structure in which the high-temperature exhaust pipe A and the low-temperature exhaust pipe B are arranged to control the flow of the high-temperature exhaust and the low-temperature exhaust so that the influence of heat on the upper and lower sides can be averaged will be described.

  FIG. 1 is an elevational sectional view illustrating an example of an exhaust pipe connection structure according to the present embodiment. In the illustrated exhaust pipe connection structure 40, a high-temperature exhaust pipe A42 and a low-temperature exhaust pipe B44 are connected to an exhaust pipe C50. The high-temperature exhaust pipe A42 passes through the flange 46 and the gasket 48, and its outlet is It opens into the exhaust pipe C50, the low temperature exhaust pipe B44 passes through the flange 46 and the gasket 48, and the outlet thereof opens into the exhaust pipe C50. The flange 46 has an opening through which the high temperature exhaust pipe A42 and the low temperature exhaust pipe B44 pass, and the space between each exhaust pipe and the opening is sealed, for example, by welding. The gasket 48 is an arbitrary gasket used for exhaust pipe connection, such as a metal ring gasket or a metal jacket type gasket. In the illustrated connection structure, the flange 46 / gasket 48 / exhaust pipe C50 are integrally connected by a bolt 52 and a nut 54.

  In FIG. 1, the exhaust pipe C50 is a butterfly valve, and the butterfly valve is connected to another exhaust pipe (not shown), but the exhaust pipe C50 is not necessarily limited to the butterfly valve. The butterfly valve is selected so that its valve body 50a does not interfere with the outlet portion 42a of the hot exhaust pipe 42 and the outlet portion 44a of the cold exhaust pipe 44. The rotation direction of the valve body 50a is as shown by an arrow. The butterfly valve is used for adjusting the flow rate or opening and closing the flow path.

  In the illustrated form, the exhaust pipe C50 extends in a direction perpendicular to the vertical direction in which the direction in which gravity acts is downward. Further, the flange surface 46a of the flange 46 is a surface parallel to the vertical direction and a surface perpendicular to the longitudinal direction of the exhaust pipe C50. For example, in order to extend the life of the gasket 48, the flange surface 46 a is 75 ° or less, particularly 70 ° or less, between the surface parallel to the direction in which the weight acts (hereinafter also referred to as “surface S”). In particular, they may be arranged to be inclined so as to form an angle α of 60 ° or less. In that case, the extending direction of the exhaust pipe C50 and the like is also inclined. The angle formed between the flange surface and the surface S is defined as an acute angle. Further, the flange surface 46a (more precisely, the surface in contact with the gasket 48) may be inclined so that it faces downward, or may be inclined so as to face upward. The high temperature exhaust pipe A42 is disposed below the low temperature exhaust pipe B44, and the low temperature exhaust pipe B44 is disposed above the high temperature exhaust pipe A42. In consideration of the fact that the high temperature exhaust gas is more likely to move upward than the low temperature exhaust gas, the high temperature exhaust gas is caused to collide with the low temperature exhaust gas before being moved upward, and the temperature is lowered.

  Both the high temperature exhaust pipe A42 and the low temperature exhaust pipe B44 extend in a direction parallel to the exhaust pipe C50 until just before reaching the flange 44, but the outlet portions 42a and 42b are both bent to the flange surface 46a. It is inclined with respect to the vertical line L. Specifically, the outlet portion 42a of the high temperature exhaust pipe A42 is inclined downward with respect to the line L at an angle θ1 of greater than 0 ° and 60 ° or less, and the outlet portion 44a of the low temperature exhaust pipe B44 is Is inclined at an angle θ2 of greater than 0 ° and 60 ° or less. θ1 and θ2 are preferably 30 ° or less, may be 10 ° or less, and may be 5 ° or less. Since the outlet portion 42a (high temperature exhaust pipe) is inclined downward, the upward movement of the high temperature exhaust gas is further suppressed, and the outlet portion 42b (cold exhaust pipe) is inclined upward, whereby the low temperature exhaust gas is discharged. Accordingly, the laminar flow of the high-temperature exhaust and the low-temperature exhaust can be effectively suppressed from being immediately formed in the vicinity of the flange 46 and the gasket 48. As a result, deterioration due to uneven heat at the upper part of the flange 46 and the gasket 48 can be further suppressed, or partial deterioration due to uneven heat of the exhaust pipe C50 or other members connected to the exhaust pipe C50 can be further suppressed. In one modification, only one of the outlet portions 42a and 44b may be inclined in the vertical direction, and the other may not be inclined in the vertical direction. Even in such a case, formation of laminar flow of high temperature exhaust and low temperature exhaust can be suppressed to some extent.

In addition or alternatively, the outlet portions 42a and 42b may be inclined at an angle of 30 ° or less in the left-right direction with respect to the line L perpendicular to the flange surface 46a. FIG. 2 shows a state in which the outlet portion 42a and the outlet portion 44b are inclined in the left-right direction in a cross-sectional view in which the connection structure is cut in the left-right direction. In the exhaust pipe connection structure shown in FIG. 2, a high temperature exhaust pipe A42 and a low temperature exhaust pipe B44 are arranged in the left-right direction, a low temperature exhaust pipe B44 is arranged on the right side, and a high temperature exhaust pipe A42 is arranged on the left side. The outlet portion 42a of the high temperature exhaust pipe A42 is inclined to the right side with respect to the line L at an angle θ3 of greater than 0 ° and not more than 30 °, and the outlet portion 44a of the low temperature exhaust pipe B44 is 0 ° to the left side with respect to the line L. It is inclined at an angle θ4 of 30 ° or less. By tilting the outlet portions 42a and 44a in the left-right direction in this way, it becomes difficult for the high-temperature exhaust gas and the low-temperature exhaust gas to form a laminar flow, and the mixing of the two exhaust gases is promoted or even if a laminar flow is formed, The temperature difference between the flows can be reduced. In one modification, the outlet portion 42a may be inclined to the left with respect to the line L, and the outlet portion 42b may be inclined to the right with respect to the line L.
Also in the connection structure shown in FIG. 2, the exhaust pipe C50 is a butterfly valve, and in the illustrated form, the valve body 50a rotates in the direction of the arrow.

  When the outlet portions 42a and 44a are tilted in the left-right direction, they are preferably tilted in opposite directions, but may be tilted in the same direction. Alternatively, only one outlet portion may be inclined in either the left or right direction. By inclining at least one outlet portion in the left or right direction with respect to the line L, the flow of exhaust gas changes, and the formation of laminar flow can be suppressed to some extent.

  θ1, θ2, θ3, and θ4 are suitable for suppressing the formation of laminar flow according to the dimensions of the high temperature exhaust pipe A42 and the low temperature exhaust pipe B44, the temperature of the gas flowing through them, the dimension of the exhaust pipe C50, and the like. It is decided so that it may become the value. In determining θ1, etc., a metal bellows can be used. Specifically, instead of the high-temperature exhaust pipe A42 and the low-temperature exhaust pipe B44 shown in FIG. Thus, an angle (θ1 or the like) effective for suppressing laminar flow formation and / or preventing heat deviation may be determined. Then, the high temperature exhaust pipe 42a and the low temperature exhaust pipe 44b are designed and manufactured so that the outlet portions 42a and 44b are inclined at the determined angle, or the high temperature exhaust pipe 42a and the low temperature exhaust pipe 44b are inclined as described later. Install.

  The outlet portion 42a and the outlet portion 44a may be inclined with respect to the line L in both the vertical direction and the horizontal direction. For example, as shown in FIG. 1, in the connection structure in which the high temperature exhaust pipe A42 (lower side) and the low temperature exhaust pipe B44 (upper side) are arranged in the vertical direction, the outlet portion 42a is inclined downward with respect to the line L. In addition, when inclined rightward, as shown in FIG. 3, the outlet 42b is displaced obliquely with respect to the position of the high temperature exhaust pipe A42 extending to the front of the flange 46 (indicated by a broken line in the figure). . Similarly, when the outlet portion 44a is inclined upward with respect to the line L and inclined leftward, as shown in FIG. 3, the position of the low temperature exhaust pipe B44 extending to the front of the flange 46 (shown by a broken line in the figure). In contrast, the outlet 44b is shifted in an oblique direction.

In FIG. 1, one high temperature exhaust pipe A42 and one low temperature exhaust pipe B44 are provided in the vertical direction. When this is seen in the flange surface 46a, it becomes arrangement | positioning as shown to Fig.4 (a). In another embodiment, one high-temperature exhaust pipe A42 and one low-temperature exhaust pipe B44 may be provided in the left-right direction, as shown in FIGS. 2 and 4B.
4 to 6 are schematic views showing the arrangement of the high temperature exhaust pipe A42 and the low temperature exhaust pipe B44 as viewed from the flange surface 46a.

  Alternatively, in still another embodiment, a plurality of high temperature exhaust pipes A42 and low temperature exhaust pipes B44 may be provided. For example, as shown in FIG. 5, two high temperature exhaust pipes A42 and two low temperature exhaust pipes B44 may be provided. When a plurality of high temperature exhaust pipes A42 and low temperature exhaust pipes B44 are provided, as shown in FIG. 6A, the group of high temperature exhaust pipes A42 is arranged on the lower side, and the group of low temperature exhaust pipes B44 is arranged on the upper side. Alternatively, as shown in FIG. 6B, the group of high-temperature exhaust pipes A42 may be arranged on one of the left and right sides, and the group of low-temperature exhaust pipes B44 may be arranged on the other side of the left and right. When a plurality of high-temperature exhaust pipes A42 and low-temperature exhaust pipes B44 are provided, the outlet part 42a of at least one high-temperature exhaust pipe A42 and the outlet part 44a of at least one low-temperature exhaust pipe B44 are inclined in either the upper, lower, left or right direction. Let

  In this embodiment, the exit portions of the high temperature exhaust pipe A and the low temperature exhaust pipe B are both bent near the flange from a pipe extending perpendicularly to the flange surface up to the flange. The outlet portion may be bent at any portion as long as the exhaust gas exiting from the outlet does not flow perpendicular to the flange surface but flows in a direction inclined from a line perpendicular to the flange surface. Thus, in another form, the outlet portion may be bent before the flange and the inclined outlet portion may pass through the opening in the flange. The exit portions of the high temperature exhaust pipe A and the low temperature exhaust pipe B may be separate members, and may be integrated with a pipe member extending perpendicularly to the flange surface, for example, by screwing. Alternatively, the outlet portions of the high temperature exhaust pipe A and the low temperature exhaust pipe B do not have to be bent. For example, as shown in FIG. 7, the straight high temperature exhaust pipe A 42 and the low temperature exhaust pipe B 44 have an outlet portion with a flange surface. The whole may be passed through the flange 46 in a state of being inclined so as to be inclined with respect to a line perpendicular to 46a. As a result, the exhaust from the outlet flows in a predetermined direction.

The structure in which the high temperature exhaust pipe A42 and the low temperature exhaust pipe B44 are connected to the exhaust pipe C50 can be used, for example, in an internal combustion engine that uses a turbocharger. In such an internal combustion engine, the high temperature exhaust pipe A42 allows exhaust from the turbocharger (this may be high pressure as described above), and the low temperature exhaust pipe B44 is normal exhaust (high pressure). The engine exhaust). The temperature of exhaust from the turbocharger is, for example, 600 ° C. or higher, and the temperature of normal exhaust is, for example, 50 to 200 ° C. The temperature of the exhaust from the turbocharger may be locally about 900 ° C., and the temperature of the normal exhaust may be 200 to 300 ° C. depending on the case. Further, since the exhaust is not always generated from the turbocharger but is intermittently generated, in such an internal combustion engine, the flange and the gasket are alternately exposed to a low temperature environment and a high temperature environment and deteriorated. Cheap. Similarly, even in a flame retardant engine using a turbocharger used for reducing carbon dioxide, the flange and the gasket are alternately exposed to a low temperature environment and a high temperature environment, and are easily deteriorated. According to the present embodiment, the formation of laminar flow between high-temperature exhaust and low-temperature exhaust is suppressed, or the temperature difference between the laminar flows is reduced, and only a part of the flange and gasket or the exhaust pipe C50 and the exhaust pipe C50 are connected. It is possible to prevent only a part of the other members from being exposed to a high temperature. Therefore, the exhaust pipe connection structure of the present embodiment is particularly suitable for use in an internal combustion engine that uses a turbocharger.
Alternatively, the exhaust pipe connection structure of the present embodiment is suitable for use in a power plant.

  The exhaust pipe connection structure of the present invention has a structure that suppresses the formation of laminar flow of high-temperature exhaust and low-temperature exhaust, or reduces the temperature difference between the laminar flows, thereby reducing the uneven heat in the exhaust pipe connection structure. For example, it can be used in an internal combustion engine that uses a turbocharger.

40 Exhaust pipe connection structure 42 High temperature exhaust pipe A
42a Outlet portion of high temperature exhaust pipe A 42b Outlet 44 Low temperature exhaust pipe B
44a Outlet portion of the low temperature exhaust pipe B 44b Outlet of the low temperature exhaust pipe B 46 Flange 46a Flange surface 48 Gasket 50 Exhaust pipe C
52 bolt 54 nut

Claims (3)

One or more hot exhaust pipes A through which higher temperature exhaust passes and one or more cold exhaust pipes B through which lower temperature exhaust passes are connected to one exhaust pipe C through a flange and a gasket. Exhaust pipe connection structure
The flange is arranged such that the flange surface forms an angle α of 0 ° to 75 ° with a plane parallel to the direction in which gravity acts.
When the flange surface is tilted by an angle α so that it is parallel to the direction in which gravity acts, the direction in which gravity acts on the flange surface is downward, and the direction perpendicular to the direction in which gravity acts is the left-right direction In addition,
At least one hot exhaust pipe A at least at the outlet portion, with respect to a line perpendicular to the flange surface, at an angle of greater than 0 ° and less than or equal to 60 ° and / or left or right, from 0 ° Is inclined at an angle of not more than 30 ° and / or at least one cold exhaust pipe B is at least at the outlet portion, upwards from 0 ° and not more than 60 ° with respect to a line perpendicular to the flange surface And / or tilted at an angle greater than 0 ° and less than or equal to 30 ° to the left or right.
Exhaust pipe connection structure.   2. The exhaust pipe connection structure according to claim 1, wherein the high-temperature exhaust pipe A and the low-temperature exhaust pipe B are provided one by one, and the high-temperature exhaust pipe A and the low-temperature exhaust pipe B are arranged in the left-right direction. . A plurality of the high temperature exhaust pipes A, a plurality of the high temperature exhaust pipes B,
The exhaust pipe connection structure according to claim 1, wherein the group of the high temperature exhaust pipes A and the group of the high temperature exhaust pipes B are arranged separately in the left-right direction.

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