Drainage device

Abstract

To provide a drainage device for suppressing noise of an exhaust system.SOLUTION: A drainage device which opens and closes a drain path passing a drain port formed in an exhaust path comprises a cylindrical member and an opening / closing member. The cylindrical member has a water conduction port communicating the exhaust path with an internal space of the cylindrical member. The drain path communicates with outside the exhaust path through the water conduction port and the internal space from the exhaust path. The opening / closing member moves relatively to the cylindrical member along an axis direction of the cylindrical member with the heat expansion caused by a temperature change of the exhaust path. In a first temperature range of the exhaust path, the opening / closing member abuts on a closing part provided at an inner periphery of the cylindrical member to close the drain path. In a second temperature range higher than the first temperature range of the exhaust path, the opening / closing member separates from the closing part to open the drain path.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present disclosure relates to a drainage device.

Background Art

[0002] In vehicles such as automobiles, a drainage device for discharging condensed water accumulated in the exhaust path to the outside of the vehicle is mounted in the exhaust system for discharging the exhaust of the internal combustion engine. For example, Patent Document 1 discloses an exhaust device provided with a drain hole for draining water at the lower part of a shell forming a part of the exhaust path.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a state where the drain hole is open, while the condensed water is drained, the noise generated in the exhaust system such as the internal combustion engine leaks to the outside. Therefore, the drain hole is opened and closed as needed. In the prior art as disclosed in Patent Document 1, in a cold state at normal temperature, the condensed water is drained by opening the drain hole, and in a warm state at a temperature higher than the cold state, the drain hole is closed to suppress the leakage of noise to the outside. However, with such a technique, the noise generated in the exhaust system in the cold state cannot be suppressed.

[0005] One aspect of the present disclosure is to provide a drainage device for suppressing the noise of the exhaust system.

Means for Solving the Problems

[0006] One aspect of the present disclosure is a drainage device that opens and closes a drainage path through a drain port formed in an exhaust path, and includes a cylindrical member and an opening / closing member. The cylindrical member extends into the exhaust path from a structure that forms the drain port in the exhaust path. The opening / closing member is a member having a coefficient of thermal expansion different from that of the cylindrical member, and is disposed in the internal space of the cylindrical member. The cylindrical member has a water passage port that communicates the exhaust path with the internal space of the cylindrical member.

[0007] The drainage path communicates from the exhaust path to the outside of the exhaust path through the water passage port and the internal space. The opening / closing member moves relative to the cylindrical member along the axial direction of the cylindrical member due to thermal expansion accompanying a temperature change in the exhaust path.

[0008] In a first temperature range in the exhaust path, the opening / closing member abuts against a closing portion provided on the inner circumference of the cylindrical member to close the drainage path. In a second temperature range, which is a temperature range higher than the first temperature range in the exhaust path, the opening / closing member separates from the closing portion to open the drainage path.

[0009] According to such a configuration, when the temperature in the exhaust path is in the first temperature range, the drainage path is closed. Therefore, it is possible to suppress the noise generated in the exhaust system from leaking to the outside through the drainage path.

[0010] In addition, when the temperature in the exhaust path is in the second temperature range, the drainage path is opened. Therefore, the drainage performance of the condensed water can be improved. In one aspect of the present disclosure, a first closing portion may be provided as a closing portion on the inner circumference of the cylindrical member, and a second closing portion may be provided at a position different from that of the first closing portion in the axial direction of the cylindrical member. In a third temperature range, which is a temperature range higher than the second temperature range in the exhaust path, the opening / closing member may abut against the second closing portion provided on the inner circumference of the cylindrical member to close the drainage path.

[0011] According to such a configuration, when the temperature in the exhaust path is in the third temperature range, the drainage path is closed. Therefore, it is possible to suppress the noise generated in the exhaust system from leaking to the outside through the drainage path.

[0012] In one aspect of the present disclosure, the cylindrical member may be arranged to pass through the drain outlet. According to such a configuration, the water inlet can be provided at a position closer to the drain outlet. Therefore, the drainage performance of the condensed water can be improved.

[0013] In one aspect of the present disclosure, the cylindrical member may be arranged to surround the drain outlet. According to such a configuration, the protrusion of the drainage device to the outside of the exhaust path is suppressed, and space saving is possible.

[0014] In one aspect of the present disclosure, the length in at least one direction perpendicular to the axial direction of the portion surrounded by the first closing portion and the portion surrounded by the second closing portion in the internal space may be shorter than the length in the direction perpendicular to the axial direction of the opening / closing member.

[0015] According to such a configuration, the opening / closing member can sufficiently close the drainage path. Therefore, it is possible to suppress the leakage of noise generated in the exhaust system to the outside through the drainage path. In one aspect of the present disclosure, at least one of the first closing portion and the second closing portion may be a portion provided so as to protrude toward the central axis side of the cylindrical member on the inner peripheral surface of the cylindrical member.

[0016] According to such a configuration, the opening / closing member can sufficiently close the drainage path. Therefore, it is possible to suppress the leakage of noise generated in the exhaust system to the outside through the drainage path. In one aspect of the present disclosure, the cylindrical member may be arranged to surround the drain outlet. The opening / closing member may have a portion where the length of the diameter orthogonal to the axial direction in the opening / closing member is longer than the diameter of the drain outlet. In a third temperature range that is a temperature range higher than the second temperature range in the exhaust path, the opening / closing member may close the drainage path so as to cover the drain outlet.

[0017] According to such a configuration, when the temperature in the exhaust path is within the third temperature range, the drainage path is blocked. Therefore, it is possible to suppress the noise generated in the exhaust system from leaking to the outside through the drainage path.

[0018] In one aspect of the present disclosure, the opening / closing member may be a member having a coefficient of thermal expansion larger than that of the cylindrical member. According to such a configuration, the upper limit of the axial length of the cylindrical member can be increased with respect to the axial length of the cylindrical member inside the exhaust path.

Brief Description of the Drawings

[0019]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Modes for Carrying Out the Invention

[0020] Hereinafter, exemplary embodiments of the present disclosure will be described with reference to the drawings. [1. First Embodiment] [1-1. Configuration] [1-1-1. Overall Configuration] The exhaust system 1 shown in FIG. 1 is mounted on a vehicle such as an automobile. The exhaust system 1 constitutes a part of an exhaust passage 2 for discharging exhaust generated by an internal combustion engine of the vehicle. The exhaust system 1 is, for example, a muffler of the vehicle. A shell 3 is provided in the exhaust passage 2. The exhaust flowing through the exhaust passage 2 passes through the inside of the shell 3. That is, the shell 3 constitutes a part of the exhaust passage 2.

[0021] As shown in FIG. 2, the shell 3 is configured to store the condensed water 4 of the exhaust burned by the internal combustion engine. The shell 3 includes a drain port 5 and a drainage device 6. The drain port 5 is provided at the lower part of the shell 3 and is a hole that penetrates from the inside to the outside of the shell 3. The drain port 5 is, for example, a circular hole. The drain port 5 may be provided below the downstream outlet of the exhaust passage 2 in the shell 3. In the present embodiment, the drain port 5 is provided on the lower surface in the vertical direction of the shell 3 and penetrates in the vertical direction. The drainage device 6 is a cylindrical device arranged to pass through the drain port 5.

[0022] [1-1-2. Configuration of Drainage Device] As shown in FIG. 3, the drainage device 6 has a cylindrical member 10, an opening / closing member 20, and a support member 30.

[0023] The cylindrical member 10 is arranged to pass through (in other words, penetrate) the drain port 5 and extends along the direction passing through the drain port 5. That is, the axial direction A of the cylindrical member 10 substantially coincides with the direction passing through the drain port 5 (in other words, the vertical direction). The cylindrical member 10 is, for example, a cylindrical member. Hereinafter, the outside of the shell 3 with respect to the drain port 5 is referred to as the outside in the axial direction A, and the inside of the shell 3 with respect to the drain port 5 is referred to as the inside in the axial direction A.

[0024] The cylindrical member 10 is joined to the drainage part 3a, which is a structure for forming the drainage port 5 in the shell 3, by welding, adhesion, or the like. The outer peripheral surface of the cylindrical member 10 and the portion of the shell 3 where the drainage port 5 is formed may be in close contact with each other, or there may be a portion where a gap is formed.

[0025] The inner surface of the cylindrical member 10 defines the internal space 11 of the cylindrical member 10. The cylindrical member 10 includes a water passage port 12, a first protruding portion 13, and a second protruding portion 14. The water passage port 12 is a through hole provided on the side surface of the cylindrical member 10. The water passage port 12 is provided in a portion of the cylindrical member 10 located inside the shell 3 and communicates the exhaust path 2 and the internal space 11. One water passage port 12 may be provided in the cylindrical member 10, or a plurality of water passage ports 12 may be provided.

[0026] The water passage port 12 and the internal space 11 form a drainage path 7 that communicates from the exhaust path 2 to the outside of the exhaust path 2 (in other words, communicates from the inside to the outside of the shell 3). The drainage port 5 guides the internal space 11 from the inside to the outside of the exhaust path 2. The drainage path 7 is formed so as to pass through the internal space 11 and the drainage port 5.

[0027] The lower the water passage port 12 is provided in the vertical direction and inside the shell 3, the better the drainage performance of the condensed water 4. In other words, the closer the water passage port 12 is provided to the drainage port 5, the less likely the condensed water 4 is to be stored in the shell 3, and the drainage performance of the condensed water 4 is improved.

[0028] Both the first protruding portion 13 and the second protruding portion 14 are provided on the inner peripheral surface of the cylindrical member 10 so as to protrude toward the central axis side of the cylindrical member 10. Both the first protruding portion 13 and the second protruding portion 14 are, for example, annular. Both the first protruding portion 13 and the second protruding portion 14 go around the inner peripheral surface of the cylindrical member 10. The first protruding portion 13 is provided outside the water passage port 12 in the axial direction A. The second protruding portion 14 is provided outside the first protruding portion 13 in the axial direction A. At least one of the first protruding portion 13 and the second protruding portion 14 may be formed of a member different from the cylindrical member 10.

[0029] The opening / closing member 20 is arranged in the internal space 11 of the cylindrical member 10 and is a rod-shaped member extending along the axial direction A. The opening / closing member 20 has a main body portion 21 and a contact portion 22. The main body portion 21 is a rod-shaped portion extending along the axial direction A. That is, the main body portion 21 extends substantially parallel to the cylindrical member 10. The outer end portion of the main body portion 21 in the axial direction A is located outside the first protruding portion 13 of the cylindrical member 10 in the axial direction A. The main body portion 21 is separated from any of the cylindrical member 10, the first protruding portion 13, and the second protruding portion 14.

[0030] The contact portion 22 is provided at the outer end portion of the main body portion 21 in the axial direction A. The contact portion 22 is located between the first protruding portion 13 and the second protruding portion 14 in the axial direction A. The contact portion 22 has a side surface portion 22a, a first contact portion 22b, and a second contact portion 22c. Hereinafter, the direction perpendicular to the axial direction A is referred to as the radial direction. The central axis side of the cylindrical member 10 in the radial direction is referred to as the inner side in the radial direction, and the side opposite to the inner side in the radial direction is referred to as the outer side in the radial direction.

[0031] The side surface portion 22a protrudes outside the main body portion 21 in the radial direction and is a portion that encircles the outer periphery of the main body portion 21. That is, the radial length of the side surface portion 22a is longer than the radial length of the main body portion 21. The outer end portion of the side surface portion 22a in the radial direction is located outside the inner end portions of the first protruding portion 13 and the second protruding portion 14 in the radial direction. The side surface portion 22a is separated from the cylindrical member 10.

[0032] The first contact portion 22b is a portion provided inside the side surface portion 22a in the axial direction A. The first contact portion 22b extends from the inner end portion of the side surface portion 22a in the axial direction A toward the main body portion 21 (that is, the central axis side of the opening / closing member 20) and is a surface that encircles the outer periphery of the main body portion 21. In the present embodiment, the first contact portion 22b is inclined inside the axial direction A with respect to the radial direction. The first contact portion 22b may be inclined outside the axial direction A with respect to the radial direction, or may be substantially parallel to the radial direction without inclination.

[0033] The second abutting portion 22c is a portion provided outside the axial direction A from the side surface portion 22a. The second abutting portion 22c extends from the outer end portion of the side surface portion 22a in the axial direction A toward the central axis side of the opening / closing member 20, and is a surface that circulates around the outer periphery of the main body portion 21. In the present embodiment, the second abutting portion 22c is inclined outside the axial direction A with respect to the radial direction. The second abutting portion 22c may be inclined inside the axial direction A with respect to the radial direction, or may be substantially parallel to the radial direction without inclination.

[0034] The support member 30 is provided at the inner end portion of the cylindrical member 10 in the axial direction A. The support member 30 supports the opening / closing member 20. The support member 30 may, for example, cover the entire opening located at the inner end portion of the cylindrical member 10 in the axial direction A, or may cover at least a part of the opening of the cylindrical member 10 to obtain the strength for supporting the opening / closing member 20. The support member 30 is, for example, a plate-like member. The support member 30 is joined to the inner end portions of both the cylindrical member 10 and the opening / closing member 20 in the axial direction A on the outer surface in the axial direction A. In the present embodiment, the support member 30 is a member different from both the cylindrical member 10 and the opening / closing member 20, but may be configured to be integral with at least one of the cylindrical member 10 and the opening / closing member 20.

[0035] [1-1-3. Relative movement due to thermal expansion] The cylindrical member 10 and the opening / closing member 20 are metal members having different coefficients of thermal expansion. In the present embodiment, the opening / closing member 20 has a coefficient of thermal expansion larger than that of the cylindrical member 10. An example of a material having a relatively large coefficient of thermal expansion is austenitic stainless steel. An example of a material having a relatively small coefficient of thermal expansion is ferritic stainless steel. As a material having a relatively small coefficient of thermal expansion, a resin material or a ceramic-based inorganic material other than metal may be used.

[0036] The cylindrical member 10 and the opening / closing member 20 thermally expand in the axial direction A and the radial direction in accordance with the temperature change within the shell 3. When expressing the amount of change in length due to thermal expansion as the amount of thermal elongation, the amount of thermal elongation in the radial direction is sufficiently smaller than the amount of thermal elongation in the axial direction A. This is because the length of the member in the radial direction is sufficiently smaller than the length of the member in the axial direction. Therefore, hereinafter, the amount of thermal elongation in the radial direction is not considered.

[0037] Due to thermal expansion accompanying the temperature change within the shell 3, the opening / closing member 20 moves relative to the cylindrical member 10 along the axial direction A of the cylindrical member 10. Specifically, the main body portion 21 thermally expands along the axial direction A, and the contact portion 22 moves relative to the cylindrical member 10 due to the thermal expansion of the main body portion 21. In the present embodiment, since the coefficient of thermal expansion of the opening / closing member 20 is larger than that of the cylindrical member 10, as the temperature within the shell 3 increases, the opening / closing member 20 moves relatively outward in the axial direction A with respect to the cylindrical member 10.

[0038] More specifically, as the temperature within the shell 3 increases, the cylindrical member 10 expands inward in the axial direction A with the drainage portion 3a as a reference point. On the other hand, as the temperature within the shell 3 rises, the opening / closing member 20 expands outward in the axial direction A with the support member 30 as a reference point. At this time, the support member 30 as a reference point moves by the amount by which the cylindrical member 10 expands inward in the axial direction A. Therefore, assuming the amount of thermal elongation of the cylindrical member 10 is δL1 and the amount of thermal elongation of the opening / closing member 20 is δL2, the contact portion 22 of the opening / closing member 20 relatively moves outward in the axial direction A by δL2 - δL1 with respect to the first protruding portion 13 of the cylindrical member 10.

[0039] [1-1-4. Opening and Closing of Drainage Path] The drainage path 7 has an open state in which it communicates from the exhaust path 2 to the outside of the exhaust path 2, and a closed state in which it does not communicate from the exhaust path 2 to the outside of the exhaust path 2.

[0040] When the drainage path 7 is in an open state, the condensed water 4 in the exhaust path 2 is discharged to the outside of the exhaust path 2 through the drainage path 7. When the drainage path 7 is in a blocked state, the discharge of the condensed water 4 in the exhaust path 2 to the outside of the exhaust path 2 through the drainage path 7 is suppressed.

[0041] The open state and the blocked state of the drainage path 7 are switched by the opening / closing member 20 moving in the axial direction A along with the temperature change in the shell 3 in the exhaust path 2. The temperature in the shell 3 has a first temperature range, a second temperature range that is a range of temperatures higher than the first temperature range, and a third temperature range that is a range of temperatures higher than the second temperature range.

[0042] The first temperature range is room temperature as an example, for example, 20°C or lower. The second temperature range is, for example, a temperature range from 20°C to 500°C. The third temperature range is, for example, 500°C or higher.

[0043] Hereinafter, as an example, when the temperature in the shell 3 within the first temperature range rises to a temperature higher than the first temperature range, the positions of the contact portion 22 in each of the first temperature range, the second temperature range, and the third temperature range will be described.

[0044] As shown in FIG. 4A, when the temperature in the shell 3 is within the first temperature range, the first contact portion 22b of the contact portion 22 contacts the entire circumference of the first protrusion 13. At this time, the drainage path 7 is in a blocked state. That is, the drainage path 7 is blocked by the portion where the first contact portion 22b and the first protrusion 13 contact. The portion where the first contact portion 22b and the first protrusion 13 contact may be in close contact by providing a gasket or the like, or there may be some gaps.

[0045] As shown in FIG. 4B, when the temperature inside the shell 3 rises and changes to a temperature within the second temperature range, the contact portion 22 moves outward in the axial direction A, and the first contact portion 22b of the contact portion 22 separates from the first protruding portion 13. The contact portion 22 also separates from the second protruding portion 14. At this time, the drainage path 7 switches to an open state as the portion blocked by the first contact portion 22b and the first protruding portion 13 is opened.

[0046] As shown in FIG. 4C, when the temperature inside the shell 3 rises and changes to a temperature within the third temperature range, the contact portion 22 further moves outward in the axial direction A, and the second contact portion 22c of the contact portion 22 contacts the entire circumference of the second protruding portion 14. At this time, the drainage path 7 switches to a closed state. That is, the drainage path 7 is blocked by the portion where the second contact portion 22c and the second protruding portion 14 contact. The portion where the second contact portion 22c and the second protruding portion 14 contact may be in close contact by providing a gasket or the like, or may have some gaps.

[0047] Thus, when the temperature inside the shell 3 is within the first temperature range, the drainage path 7 is in a closed state. When the temperature inside the shell 3 rises from the first temperature range and changes to the second temperature range, the drainage path 7 switches from a closed state to an open state. Further, when the temperature inside the shell 3 rises from the second temperature range and changes to the third temperature range, the drainage path 7 switches from an open state to a closed state. Similarly, when the temperature drops, when the temperature inside the shell 3 drops from the third temperature range and changes to a temperature within the second temperature range, the drainage path 7 switches from a closed state to an open state. Further, when the temperature inside the shell 3 drops and changes from the second temperature range to a temperature within the first temperature range, the drainage path 7 switches from an open state to a closed state.

[0048] [1-2. Function, Effect] According to the embodiment described in detail above, the following functions and effects can be obtained. When the temperature inside the shell 3 is within the first temperature range, the first contact portion 22b of the contact portion 22 contacts the entire circumference of the first protrusion 13. At this time, the drainage path 7 is blocked by the portion where the first contact portion 22b and the first protrusion 13 contact. That is, the drainage path 7 is in a blocked state.

[0049] According to such a configuration, when the temperature inside the shell 3 is within the first temperature range, it is possible to suppress the noise generated in the exhaust system 1 from leaking to the outside through the drainage path 7. For example, when starting an internal combustion engine, the temperature inside the shell 3 is often at room temperature of about 20°C. Therefore, for example, when the first temperature range is a range with room temperature as the upper limit, it is possible to suppress the noise during starting of the internal combustion engine and the like from leaking out through the drainage path 7.

[0050] When the temperature inside the shell 3 is within the second temperature range, the contact portion 22 is separated from both the first protrusion 13 and the second protrusion 14. At this time, the drainage path 7 is in an open state. According to such a configuration, when the temperature inside the shell 3 is within the second temperature range, the drainage device 6 can drain the condensed water 4 to the outside of the exhaust path 2 through the drainage path 7. Therefore, the drainage performance of the condensed water 4 can be improved.

[0051] When the temperature inside the shell 3 exceeds room temperature and is within the second temperature range due to the running of the vehicle, the drainage path 7 is in an open state. However, at this time, since the sound components of the noise are mostly high-frequency components, the noise can be reduced by other noise reduction methods such as sound-absorbing materials.

[0052] When the temperature inside the shell 3 is within the third temperature range, the second contact portion 22c of the contact portion 22 contacts the entire circumference of the second protrusion 14. At this time, the drainage path 7 is blocked by the portion where the second contact portion 22c and the second protrusion 14 contact. That is, the drainage path 7 is in a blocked state.

[0053] According to such a configuration, when the temperature inside the shell 3 is within the third temperature range, it is possible to suppress the noise generated in the exhaust system 1 from leaking to the outside through the drainage path 7. For example, when the third temperature range is a high temperature of 500°C or higher, it is possible to suppress the idle noise of the internal combustion engine during signal waiting or the like from leaking out from the drainage path 7.

[0054] (1d) The water inlet 12 is provided on the side surface of the cylindrical member 10 and inside the shell 3. The first protrusion 13 is provided outside the water inlet 12 in the axial direction A. The second protrusion 14 is provided outside the first protrusion 13 in the axial direction A. The cylindrical member 10 is arranged to pass through the drain port 5. Therefore, when the drainage path 7 is in an open state, the condensed water 4 that has entered the internal space 11 of the cylindrical member 10 from the water inlet 12 flows downward corresponding to the outside in the axial direction A under the action of gravity, and is discharged to the outside of the exhaust path 2 through the drain port 5.

[0055] According to the examples shown in FIGS. 2 and 3, the first protrusion 13 is located inside the shell 3, while the second protrusion 14 is located outside the shell 3. However, the positions of the first protrusion 13 and the second protrusion 14 are not limited to this. The above-described drainage function using gravity works regardless of whether both the first protrusion 13 and the second protrusion 14 are located inside the shell 3 or outside the shell 3.

[0056] When the drainage device 6 is arranged with respect to the shell 3 such that both the first protrusion 13 and the second protrusion 14 are located outside the shell 3, the water inlet 12 can be provided at a position closer to the drain port 5 inside the shell 3. With such an arrangement, the drainage property of the condensed water 4 is improved.

[0057] (1e) The drainage device 6 is arranged to pass through the drain port 5 that penetrates from the inside to the outside of the shell 3. That is, at least a part of the drainage device 6 is provided inside the shell 3 in the exhaust path 2.

[0058] According to such a configuration, when the exhaust gas hits the portion located inside the shell 3 in the drainage device 6, the drainage device 6 is likely to be heated. Therefore, the relative movement in the axial direction A of the opening / closing member 20 accompanying the temperature change in the shell 3 due to the exhaust gas is promoted, and the switching between the open state and the closed state of the drainage path 7 is promoted.

[0059] (1f) The opening / closing member 20 has a coefficient of thermal expansion larger than that of the cylindrical member 10. According to such a configuration, the amount of thermal expansion of the cylindrical member 10 is smaller than the amount of thermal expansion of the opening / closing member 20. Therefore, the upper limit of the length of the cylindrical member 10 in the axial direction A can be increased with respect to the length of the shell 3 in the axial direction A.

[0060] [1-3. Corresponding relationships between terms] In the above embodiment, the first protruding portion 13 corresponds to an example of the first closing portion, and the second protruding portion 14 corresponds to an example of the second closing portion.

[0061] [1-4. Modification example] In the first embodiment described above, the cylindrical member 10 was arranged to pass through the drain port 5 penetrating from the inside to the outside of the shell 3. However, as shown in FIG. 5, the cylindrical member 10 may be arranged to surround a drain port 105 having a diameter smaller than the inner diameter of the cylindrical member 10. In the drainage device 106 of the modification example shown in FIG. 5, the cylindrical member 10 is joined to a drainage portion 3a which is a structure forming the drain port 105 in the shell 3 by welding, adhesion, or the like on the inner surface of the shell 3. The same reference numerals as those used in the first embodiment in FIG. 5 indicate the same configuration as the drainage device 6 of the first embodiment in the drainage device 106, and refer to the preceding description.

[0062] [2. Second embodiment] [2-1. Configuration] In the second embodiment shown in FIG. 6, since the basic configuration of the drainage device 206 is the same as that of the drainage device 6 in the first embodiment, the differences between the second embodiment and the first embodiment will be described below. The same reference numerals as those in the first embodiment used in this embodiment indicate the same configuration as that of the drainage device 6 in the first embodiment in the drainage device 206. Refer to the previous description.

[0063] In the drainage device 206 of the second embodiment, similar to the drainage device 106 of the above-described modification, the cylindrical member 10 is arranged so as to surround the drain port 205. The drainage device 206 of the second embodiment has a configuration in which the radial length of the contact portion 22 of the opening / closing member 20 is longer than the radial length of the drain port 205, instead of including the second protruding portion 14 of the first embodiment described above.

[0064] Therefore, as shown in FIG. 6, when the temperature inside the shell 3 changes from the second temperature range to the third temperature range, the contact portion 22 moves outward in the axial direction A. The second contact portion 22c of the contact portion 22 comes into contact with the entire circumference of the inner surface of the drain portion 3a of the shell 3 and closes so as to cover the drain port 205. At this time, the drainage path 7 is switched to a closed state by being blocked by the portion where the second contact portion 22c and the drain portion 3a are in contact. The portion where the second contact portion 22c and the drain portion 3a are in contact may be in close contact by providing a gasket or the like, or may have some gaps.

[0065] [2-2. Operation, Effect] According to the second embodiment described in detail above, the same effects as those of the first embodiment can be obtained. In addition, according to the second embodiment, the drainage device 206 is arranged inside the shell 3 without passing through the drain port 205. For this reason, the protrusion of the drainage device 206 to the outside of the shell 3 is suppressed, and the exhaust system 1 can be made more space-saving.

[0066] [3. Third Embodiment] [3-1. Configuration] The basic configuration of the drainage device 306 in the third embodiment shown in FIG. 7 is the same as that of the drainage device 6 in the first embodiment. Therefore, the differences between the third embodiment and the first embodiment will be described below. The same reference numerals as those in the first embodiment used in this embodiment indicate the same configuration as that of the drainage device 6 in the first embodiment in the drainage device 306. Refer to the previous description.

[0067] In the first embodiment, the drain port 5 was provided on the lower surface in the vertical direction of the shell 3 and penetrated in the vertical direction. In contrast, in the third embodiment, the drain port 305 is provided on a surface extending in the vertical direction of the shell 3 and penetrates in the horizontal direction perpendicular to the vertical direction. The drainage device 306 is arranged so as to surround this drain port 305. That is, the drainage device 306 is arranged such that the axial direction A of the cylindrical member 10 substantially coincides with the horizontal direction. Therefore, the configuration of the drainage device 306 is the same as a modified example of the first embodiment except that it is provided in the horizontal direction.

[0068] [3-2. Operation, Effect] According to the third embodiment described in detail above, the same effects as those of the first embodiment can be obtained. In addition, according to the third embodiment, the cylindrical member 10 extends along the horizontal direction. For this reason, the influence of the distance between the water passage port 12 provided on the side surface of the cylindrical member 10 and the drain port 305 on the drainage property of the condensed water 4 is small. That is, the influence of the positions where the water passage port 12, the first protruding portion 13, and the second protruding portion 14 are provided on the drainage property is small.

[0069] Therefore, by adjusting the length of the cylindrical member 10 and the main body portion 21 of the opening and closing member 20 in the axial direction A, and adjusting the positions where the first protruding portion 13, the second protruding portion 14, and the contact portion 22 of the opening and closing member 20 are provided, it is possible to adjust the time during which the drainage path 7 is in an open state when the temperature in the shell 3 rises from the first temperature range to the third temperature range without significantly impairing the drainage property.

[0070] [4. Other Embodiments] As described above, the embodiments of the present disclosure have been explained. Needless to say, the present disclosure can take various forms without being limited to the above embodiments.

[0071] (4a) In the above embodiment, both the first abutting portion 22b and the second abutting portion 22c were inclined with respect to the radial direction. However, the shape of the abutting portion 22 is not particularly limited, and when the temperature inside the shell 3 is within the first temperature range, any structure may be used as long as the abutting portion 22 abuts against a portion (for example, the first protruding portion 13) provided on the inner circumference of the cylindrical member 10 to close the drainage path 7.

[0072] That is, it is sufficient that the radial length of the abutting portion 22 has a portion that is longer than the radial length in a part of the internal space 11. For example, as shown in FIGS. 8A and 8B, the abutting portion 22 may be changed to an abutting portion 422 including a first abutting portion 422b and a second abutting portion 422c that are substantially parallel to the radial direction.

[0073] (4b) In the above embodiment, both the first protruding portion 13 and the second protruding portion 14 were provided so as to protrude toward the central axis side of the cylindrical member 10 on the inner circumferential surface of the cylindrical member 10. However, the cylindrical member 10 is not limited to the first protruding portion 13, and may have any structure as long as it abuts against the first abutting portions 22b and 422b in the first temperature range to close the drainage path 7. The cylindrical member 10 is not limited to the second protruding portion 14, and may have any structure as long as it abuts against the second abutting portions 22c and 422c in the third temperature range to close the drainage path 7.

[0074] For example, as shown in FIG. 8A, the cylindrical member 10 in the drainage device 406 may have a first inclined portion 413 that is inclined with respect to the axial direction A instead of the first protruding portion 13, and may have a second inclined portion 414 that is inclined with respect to the axial direction A instead of the second protruding portion 14.

[0075] At this time, the radial length of the portion surrounded by the first inclined portion 413 in the internal space 11 becomes shorter as it goes toward the inner side in the axial direction A, and has a portion shorter than the radial length of the contact portion 422. The radial length of the portion surrounded by the second inclined portion 414 in the internal space 11 becomes shorter as it goes toward the outer side in the axial direction A, and has a portion shorter than the radial length of the contact portion 422.

[0076] In the above embodiment, the first inclined portion 413 corresponds to an example of the first closing portion, and the second inclined portion 414 corresponds to an example of the second closing portion. Alternatively, as shown in FIG. 8B, a recess 515 recessed in the radial direction may be provided on the inner peripheral surface of the cylindrical member 10 in the drainage device 506. Instead of the first protruding portion 13, the cylindrical member 10 may have a first stepped portion 513 that is an end portion on the inner side in the axial direction A in the recess 515 and forms a step on the inner peripheral surface of the cylindrical member 10. Instead of the second protruding portion 14, the cylindrical member 10 may have a second stepped portion 514 that is an end portion on the outer side in the axial direction A in the recess 515 and forms a step on the inner peripheral surface of the cylindrical member 10.

[0077] At this time, the first stepped portion 513 is located on the inner side in the axial direction A than the contact portion 422 of the opening and closing member 20. The second stepped portion 514 is located on the outer side in the axial direction A than the contact portion 422 of the opening and closing member 20. In the internal space 11, the radial length of the portion surrounded by the surface on the inner side or the outer side in the axial direction A than the recess 515 on the inner peripheral surface of the cylindrical member 10 is shorter than the radial length of the contact portion 22. In the internal space 11, the radial length of the portion surrounded by the recess 515 on the inner peripheral surface of the cylindrical member 10 is longer than the radial length of the contact portion 422.

[0078] In the above embodiment, the first stepped portion 513 corresponds to an example of the first closing portion, and the second stepped portion 514 corresponds to an example of the second closing portion. (4c) In the above-described embodiment, in the drainage device 6, the structure that closes the drainage path 7 when the temperature inside the shell 3 is within the first temperature range (i.e., the first protruding portion 13 and the first abutting portion 22b) is located closer to the inner side in the axial direction A than the structure that closes the drainage path 7 when the temperature inside the shell 3 is within the third temperature range (i.e., the second protruding portion 14 and the second abutting portion 22c). However, the positions of these structures in the axial direction A may be reversed.

[0079] For example, as shown in FIGS. 9A and 9B, the drainage device 606 may include a convex portion 616 on the inner peripheral surface of the cylindrical member 10. The drainage device 606 may include the abutting portion 622 shown in FIGS. 9A and 9B instead of the abutting portion 22.

[0080] The abutting portion 622 has a side surface portion 622a, a first abutting portion 622b, and a second abutting portion 622c. The side surface portion 622a is a portion that goes around the main body portion 21 of the opening / closing member 20.

[0081] The first abutting portion 622b is a portion provided at the outer end in the axial direction A of the side surface portion 622a. The first abutting portion 622b protrudes toward the outer side in the radial direction and goes around the outer periphery of the side surface portion 622a.

[0082] The second abutting portion 622c is a portion provided at the inner end in the axial direction A of the side surface portion 622a. The second abutting portion 622c protrudes toward the outer side in the radial direction and goes around the outer periphery of the side surface portion 622a.

[0083] The convex portion 616 of the cylindrical member 10 protrudes toward the central axis side of the cylindrical member 10 on the inner peripheral surface of the cylindrical member 10. In the convex portion 616, the portion extending from the top of the convex portion 616 toward the inner peripheral surface of the cylindrical member 10 may be inclined with respect to the radial direction.

[0084] The convex portion 616 is positioned between the first contact portion 622b and the second contact portion 622c in the axial direction A. The convex portion 616 is spaced apart from the side surface portion 622a. The radial length of the portion surrounded by the convex portion 616 in the internal space 11 is shorter than the radial length of each of the first contact portion 622b and the second contact portion 622c.

[0085] Hereinafter, as an example, when the temperature in the shell 3 within the first temperature range rises to a temperature higher than the first temperature range, the positions of the contact portions 622 in each of the first temperature range, the second temperature range, and the third temperature range will be described.

[0086] As shown in FIG. 9A, when the temperature in the shell 3 is within the first temperature range, the first contact portion 622b of the contact portion 622 contacts the outer surface of the convex portion 616 in the axial direction A over the entire circumference. At this time, the drainage path 7 is in a closed state. That is, the drainage path 7 is blocked by the portion where the first contact portion 622b and the convex portion 616 contact each other.

[0087] When the temperature in the shell 3 rises and changes to the temperature within the second temperature range, the contact portion 622 moves outward in the axial direction A, and both the first contact portion 622b and the second contact portion 622c of the contact portion 622 are separated from the convex portion 616. At this time, the drainage path 7 switches to an open state due to the opening of the portion that was blocked by the first contact portion 622b and the convex portion 616.

[0088] As shown in FIG. 9B, when the temperature in the shell 3 rises and changes to the temperature within the third temperature range, the contact portion 622 moves further outward in the axial direction A, and the second contact portion 622c of the contact portion 622 contacts the inner surface of the convex portion 616 in the axial direction A over the entire circumference. At this time, the drainage path 7 switches to a closed state. That is, the drainage path 7 is blocked by the portion where the second contact portion 622c and the convex portion 616 contact each other.

[0089] In the above embodiment, the outer surface of the convex portion 616 in the axial direction A corresponds to an example of the first blocking portion, and the inner surface of the convex portion 616 in the axial direction A corresponds to an example of the second blocking portion. (4d) In the above embodiment, the opening / closing member 20 had a coefficient of thermal expansion larger than that of the cylindrical member 10. However, the opening / closing member 20 may have a coefficient of thermal expansion smaller than that of the cylindrical member 10.

[0090] At this time, both the first protruding portion 13 and the second protruding portion 14 are located inside the drainage portion 3a in the axial direction A (in other words, inside the shell 3). As the temperature inside the shell 3 rises, the contact portion 22 of the opening / closing member 20 relatively moves δL1 - δL2 inward in the axial direction A with respect to the second protruding portion 14 of the cylindrical member 10.

[0091] When the temperature inside the shell 3 is within the first temperature range, the second contact portion 22c of the contact portion 22 contacts over the entire circumference of the second protruding portion 14, and the drainage path 7 is in a closed state. When the temperature inside the shell 3 is within the second temperature range, the contact portion 22 is separated from both the first protruding portion 13 and the second protruding portion 14, and the drainage path 7 is in an open state.

[0092] When the temperature inside the shell 3 is within the third temperature range, the first contact portion 22b of the contact portion 22 contacts over the entire circumference of the first protruding portion 13, and the drainage path 7 is in a closed state. (4e) A plurality of functions of one component in the above embodiment may be realized by a plurality of components, or one function of one component may be realized by a plurality of components. Also, a plurality of functions of a plurality of components may be realized by one component, or one function realized by a plurality of components may be realized by one component. Further, a part of the configuration of the above embodiment may be omitted. Also, at least a part of the configuration of the above embodiment may be added to or replaced with the configuration of other above embodiments.

[0093] [Technical idea disclosed in this specification] [Item 1] A drainage device that opens and closes a drainage path passing through a drainage port formed in an exhaust path, A cylindrical member extending into the exhaust path from the structure forming the drain outlet in the exhaust path, A member having a coefficient of thermal expansion different from that of the cylindrical member, and an opening / closing member disposed in the internal space of the cylindrical member, and comprising: The cylindrical member has a water passage opening communicating the exhaust path and the internal space of the cylindrical member, The drain path communicates from the exhaust path to the outside of the exhaust path through the water passage opening and the internal space, The opening / closing member moves relative to the cylindrical member along the axial direction of the cylindrical member due to thermal expansion accompanying a temperature change in the exhaust path, In a first temperature range in the exhaust path, the opening / closing member abuts against a closing portion provided on the inner circumference of the cylindrical member to close the drain path, In a second temperature range which is a temperature range higher than the first temperature range in the exhaust path, the opening / closing member separates from the closing portion to open the drain path. Drainage device.

[0094] [Item 2] The drainage device according to Item 1, wherein A first closing portion is provided on the inner circumference of the cylindrical member as the closing portion, and a second closing portion is further provided at a position different from the first closing portion in the axial direction of the cylindrical member, In a third temperature range which is a temperature range higher than the second temperature range in the exhaust path, the opening / closing member abuts against the second closing portion provided on the inner circumference of the cylindrical member to close the drain path, Drainage device.

[0095] [Item 3] The drainage device according to Item 2, wherein The cylindrical member is disposed so as to pass through the drain outlet. Drainage device.

[0096] [Item 4] The drainage device according to Item 2, wherein The cylindrical member is arranged so as to surround the drain outlet. Drainage device.

[0097] [Item 5] The drainage device according to any one of Items 2 to 4, The length in at least one direction perpendicular to the axial direction of the portion surrounded by the first closing portion and the portion surrounded by the second closing portion in the internal space is shorter than the length in the direction perpendicular to the axial direction of the opening / closing member. Drainage device.

[0098] [Item 6] The drainage device according to Item 5, At least one of the first closing portion and the second closing portion is a portion provided so as to protrude toward the central axis side of the cylindrical member on the inner peripheral surface of the cylindrical member. Drainage device.

[0099] [Item 7] The drainage device according to Item 1, The cylindrical member is arranged so as to surround the drain outlet, The opening / closing member has a portion where the length of the diameter orthogonal to the axial direction in the opening / closing member is longer than the diameter of the drain outlet, In a third temperature range that is a temperature range higher than the second temperature range in the exhaust path, the opening / closing member closes the drainage path so as to cover the drain outlet. Drainage device.

[0100] [Item 8] The drainage device according to any one of Items 1 to 7, The opening / closing member is a member having a coefficient of thermal expansion larger than that of the cylindrical member. Drainage device.

Explanation of reference numerals

[0101] 1…Exhaust system, 2…Exhaust path, 5, 105, 205, 305…Drain outlet, 6, 106, 206, 306, 406, 506, 606…Drainage device, 7…Drainage path, 10…Cylindrical member, 11…Internal space, 12…Water inlet, 13…First protruding portion, 14…Second protruding portion, 20…Opening and closing member, 21…Main body portion, 22, 422, 622…Contact portion, 22b, 422b, 622b…First contact portion, 22c, 422c, 622c…Second contact portion, 413…First inclined portion, 414…Second inclined portion, 513…First step portion, 514…Second step portion, 616…Convex portion.

Claims

1. A drainage device for opening and closing a drainage path passing through a drainage port formed in an exhaust path, comprising: a cylindrical member extending into the exhaust path from a structure forming the drainage port in the exhaust path; a closing member having a coefficient of thermal expansion different from that of the cylindrical member and disposed in the internal space of the cylindrical member; and the cylindrical member has a water passage port communicating the exhaust path with the internal space of the cylindrical member; the drainage path communicates from the exhaust path to the outside of the exhaust path through the water passage port and the internal space; the closing member moves relative to the cylindrical member along the axial direction of the cylindrical member due to thermal expansion accompanying a temperature change in the exhaust path; in a first temperature range in the exhaust path, the closing member abuts against a closing portion provided on the inner circumference of the cylindrical member to close the drainage path; in a second temperature range which is a temperature range higher than the first temperature range in the exhaust path, the closing member separates from the closing portion to open the drainage path; A drainage device.

2. The drainage device according to claim 1, wherein a first closing portion is provided as the closing portion on the inner circumference of the cylindrical member, and a second closing portion is further provided at a position different from the first closing portion in the axial direction of the cylindrical member; in a third temperature range which is a temperature range higher than the second temperature range in the exhaust path, the closing member abuts against the second closing portion provided on the inner circumference of the cylindrical member to close the drainage path; A drainage device.

3. The drainage device according to claim 2, wherein the cylindrical member is arranged to pass through the drainage port; A drainage device.

4. The drainage device according to claim 2, wherein the cylindrical member is arranged to surround the drainage port; A drainage device.

5. The drainage device according to any one of claims 2 to 4, wherein the length in a direction perpendicular to the axial direction of at least one of the portion surrounded by the first closing portion and the portion surrounded by the second closing portion in the internal space is shorter than the length in the direction perpendicular to the axial direction of the closing member; A drainage device.

6. The drainage device according to claim 5, wherein at least one of the first closing portion and the second closing portion is a portion provided so as to protrude toward the central axis side of the cylindrical member on the inner circumferential surface of the cylindrical member; A drainage device.

7. The drainage device according to claim 1, wherein The cylindrical member is arranged to surround the drain outlet, The opening / closing member has a portion where the length of the diameter orthogonal to the axial direction in the opening / closing member is longer than the diameter of the drain outlet, In a third temperature range which is a temperature range higher than the second temperature range in the exhaust path, the opening / closing member closes the drain path so as to cover the drain outlet, Drainage device.

8. The drainage device according to claim 1, The opening / closing member is a member having a coefficient of thermal expansion larger than that of the cylindrical member, Drainage device.

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