JP2022186321A - Exhaust purification device - Google Patents

Abstract

To provide a technique capable of downsizing an exhaust purification system mounted with an exhaust purification device.SOLUTION: An exhaust purification device purifying exhaust gas from an internal combustion engine comprises an outer shell member, a catalyst and a support member. A purification section is arranged inside the outer shell member where the exhaust gas flows therein and purifies the exhaust gas. The support member is installed on the outer shell member and supports the purification section so as to allow the same to be displaced inside the outer shell member. The support member allows the purification section to be displaced to a first position which causes the exhaust gas to pass through an inner flow passage formed inside the purification section and a second position which makes the exhaust gas harder to pass through the inner flow passage than the first position.SELECTED DRAWING: Figure 3

Description

The present disclosure relates to an exhaust purification device.

2. Description of the Related Art Exhaust gas purification systems are known that use an exhaust gas purification device provided with two catalysts, a main catalyst and a sub-catalyst, to purify exhaust gas from an internal combustion engine.
Patent Document 1 discloses a main catalyst arranged in an exhaust pipe, a sub-catalyst arranged upstream of the main catalyst in the exhaust pipe and heated by electricity, and an exhaust pipe in which the sub-catalyst is arranged. and a bypass line that bypasses the exhaust purification device capable of early warm-up of the catalyst. The bypass pipe is provided to suppress thermal deterioration of the sub-catalyst and an increase in ventilation resistance in the exhaust pipe. In this exhaust purification device, the opening and closing of the valves provided in the exhaust pipe and the bypass pipe are controlled based on the temperature of the exhaust gas, so that the flow passage of the exhaust gas is formed between the exhaust pipe and the bypass pipe. can be switched between.

JP-A-8-14032

However, in the exhaust gas purification device described above, since the bypass pipe line is provided separately from the exhaust pipe line, the exhaust gas purification system including the exhaust gas purification device tends to be large, and it is difficult to reduce the size of the exhaust gas purification system.

An object of one aspect of the present disclosure is to provide a technology capable of downsizing an exhaust purification system including an exhaust purification device.

One aspect of the present disclosure is an exhaust purification device that purifies exhaust gas from an internal combustion engine, and includes an outer shell member, a purification section, and a support member. Exhaust gas flows through the outer shell member. The purifier is arranged inside the outer shell member and purifies the exhaust gas. The support member is attached to the outer shell member and supports the purifier so that the position of the purifier can be displaced within the outer shell. The purifier has a first position where the exhaust gas passes through the internal flow path formed in the purifier by the support member, and a second position where the exhaust gas is less likely to pass through the internal flow path than at the first position. 2 positions.

In such a configuration, the position of the purification section can be displaced between the first position and the second position within the outer shell member by the support member. For this reason, a flow path through which the exhaust gas passes through the internal flow path of the purifying unit and then through the inside of the outer shell member, and a flow path through which the exhaust gas passes through the inside of the outer shell member in a state where it is difficult for the exhaust gas to pass through the internal flow path are provided. It can be switched within the shell member. Therefore, since the flow path can be switched within one member, it is possible to reduce the size of the exhaust gas purification system including the exhaust gas purification device, compared to a configuration in which a plurality of pipes are provided to switch the flow path of the exhaust gas. can be done.

In one aspect of the present disclosure, the purification unit may be capable of being displaced between the first position and the second position by rotating with respect to the support member. According to such a configuration, it is possible to displace the position of the purifying section with a simple configuration in which the supporting member is rotated as a reference.

One aspect of the present disclosure may further include a wall member that covers at least a portion of the outer peripheral surface of the purification section. The wall member may rotate with the purification section relative to the support member and be positioned between the exhaust gas inlet of the shell member and the purification section when the purification section is in the second position. The wall member may block more of the inlet when the purification section is in the second position than when the purification section is in the first position. According to this configuration, when the purifier is at the second position, the wall member is arranged between the exhaust gas inlet of the outer shell member and the purifier, so that the exhaust gas is less likely to hit the purifier. can do. As a result, by displacing the purification unit from the first position to the second position, thermal deterioration of the purification unit can be suppressed. Further, when the purifier is at the second position, it is more difficult for the exhaust gas to pass through the internal flow path of the purifier than when the purifier is at the first position, so an increase in ventilation resistance can be suppressed. can.

In one aspect of the present disclosure, the purification unit may be arranged coaxially with the central axis of the exhaust gas inlet in the outer shell member when in the first position, and the internal flow path may extend along the central axis. According to such a configuration, when the purifier is at the first position, compared to, for example, the case where the purifier is not arranged coaxially with the central axis of the exhaust gas inlet in the outer shell member, the exhaust gas can be facilitated to flow uniformly into the cleaning section. As a result, the purifying performance and exhaust performance of the purifying section are likely to be ensured.

An aspect of the present disclosure may further include another purifying section arranged inside the outer shell member and having a cross-sectional area perpendicular to the flow direction of the exhaust gas larger than that of the purifying section. According to such a configuration, since the purifying section and the other purifying section are arranged in the outer shell member, compared to a configuration in which the purifying section and the other purifying section are arranged in separate members, exhaust gas purification can be performed. An exhaust gas purification system provided with the device can be miniaturized. Also, since the purifying section is smaller than the other purifying sections, the purifying section is likely to be warmed up early.

In one aspect of the present disclosure, the purification unit may be an electrically heated catalyst that is heated by energization, and the energization may be performed via the support member. According to such a configuration, the purifier is easily warmed up early by heating, and the exhaust gas purifying action can be activated more quickly than when the purifier is not an electrically heated catalyst.

FIG. 10 is a perspective view of the exhaust gas purification device when the sub-catalyst is in the first position, with the outer shell member transparently shown with part of the illustration omitted; FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1; FIG. 10 is a perspective view of the exhaust gas purification device when the sub-catalyst is in the second position, with the outer shell member transparently shown with part of the illustration omitted; FIG. 4 is a sectional view along IV-IV in FIG. 3; FIG. 2 is a diagram showing the flow of exhaust gas in the II-II section of FIG. 1 when the sub-catalyst is in the first position; FIG. 2 is a view showing the flow of exhaust gas taken along line VI-VI in FIG. 1 when the sub-catalyst is at the first position; FIG. 4 is a diagram showing the flow of exhaust gas when the sub-catalyst is in the second position, taken along line IV-IV in FIG. 3; FIG. 4 is a diagram showing the flow of exhaust gas in the VIII-VIII section of FIG. 3 when the sub-catalyst is in the second position; FIG. 10 is a diagram showing a modification of the arrangement position of the sub-catalyst in the outer shell member; FIG. 3 is a diagram showing an exhaust gas purification device in which the outer shell member is composed of two members, a first outer shell member in which a sub-catalyst is arranged and a second outer shell member in which a main catalyst is arranged. FIG. 4 is a diagram showing an exhaust purification device provided with a sub-catalyst with a diameter larger than the inner diameter of the inlet. FIG. 4 is a diagram showing a sub-catalyst formed in an elliptical columnar shape; FIG. 4 is a diagram showing a sub-catalyst formed in a quadrangular prism shape; FIG. 4 is a diagram showing an exhaust purification device having a bent supporting member; FIG. 10 is a cross-sectional view showing the sub-catalyst in the first position in the exhaust purification device having the bent supporting member. FIG. 10 is a cross-sectional view showing the sub-catalyst in the second position in the exhaust purification device having the bent supporting member. FIG. 10 is a diagram showing an exhaust purification device having a configuration in which a buffer member is arranged between a contact portion provided on the upstream side of a case member and an outer shell member; FIG. 4 is a diagram showing an exhaust gas purification device provided with an outer shell member configured such that the central axis of the inlet portion and the central axis of the main body portion are not coaxial. FIG. 10 is a cross-sectional view of the sub-catalyst at the first position in the exhaust purification device configured such that the position of the sub-catalyst is displaced by linear motion of the supporting member; FIG. 10 is a cross-sectional view showing the sub-catalyst at the second position in the exhaust purification device configured such that the position of the sub-catalyst is displaced by linear motion of the support member;

Exemplary embodiments of the present disclosure are described below with reference to the drawings.
[1. Constitution]
An exhaust purification device 100 shown in FIGS. 1 to 4 is a device for purifying exhaust gas discharged from an internal combustion engine of an automobile. The exhaust purification device 100 includes an outer shell member 1 , two bearings 2 , a case member 3 , a main catalyst 4 , a sub-catalyst 5 , two support members 6 and an actuator 7 . Note that the outer shell member 1 of the exhaust purification device 100 shown in FIGS. 1 and 3 is shown as a whole in a transparent manner in order to easily show the internal structure inside the outer shell member 1, and is partially omitted. It is

The outer shell member 1 is a cylindrical member that forms an exhaust flow path through which exhaust gas flows. The outer shell member 1 extends linearly along the direction in which the exhaust gas flows. A cross section perpendicular to the central axis A of the shell member 1 is substantially circular. As shown in FIGS. 2 and 4 , the shell member 1 includes a body portion 11 , an upstream portion 12 , a downstream portion 13 , an inlet portion 14 and an outlet portion 15 .

The main body 11 is a cylindrical tube having a substantially constant diameter. The upstream portion 12 is a cylindrical portion located upstream of the main body portion 11 with respect to the flow direction of the exhaust gas, and is formed in a tapered shape with a diameter decreasing toward the upstream side. The downstream portion 13 is a cylindrical portion downstream of the main body portion 11 with respect to the flow direction of the exhaust gas, and is formed in a tapered shape that decreases in diameter toward the downstream side. The inlet portion 14 is a cylindrical portion having a substantially constant diameter on the upstream side of the upstream portion 12 with respect to the flow direction of the exhaust gas, and serves as an exhaust gas inlet in the outer shell member 1 . The outlet portion 15 is a cylindrical portion having a substantially constant diameter on the downstream side of the downstream portion 13 with respect to the flow direction of the exhaust gas, and serves as an exhaust gas outlet in the outer shell member 1 .

The bearing 2 is a cylindrical member. The bearing 2 is fixed to the upstream side of the body portion 11 while passing through the body portion 11 . The two bearings 2 are arranged in the body portion 11 so that their central axes are aligned with each other. A support member 6 , which will be described later, is inserted into the bearing 2 so as to pass through the body portion 11 . The bearing 2 has a function of being able to seal the space between the bearing 2 and the shell member 1 so that the exhaust gas does not leak to the outside of the shell member 1 . The bearing 2 is made of, for example, an insulating material such as resin or rubber.

The case member 3 is a cylindrical member having a substantially constant diameter and is accommodated inside the outer shell member 1 . Two through holes 31 are formed in the case member 3 . The two through holes 31 are provided so as to face each other. A support member 6 described later is inserted into each of the two through holes 31 .

The main catalyst 4 and the sub-catalyst 5 are each formed in a cylindrical shape. The main catalyst 4 extends along the direction of exhaust gas flow. The sub-catalyst 5 extends along the direction of exhaust gas flow when it is at a first position, which will be described later, and extends substantially perpendicularly to the direction of exhaust gas flow when it is at a second position, which will be described later. The main catalyst 4 is arranged inside the outer shell member 1 so that a slight gap is formed between it and the inner peripheral surface of the outer shell member 1 . A protective mat 41 having cushioning properties is arranged in the gap. The main catalyst 4 has an internal flow path through which the exhaust gas passes. The internal flow path of the main catalyst 4 extends along the central axis A of the outer shell member 1 . The sub-catalyst 5 is arranged inside the case member 3 so that a slight gap is formed between the sub-catalyst 5 and the inner peripheral surface of the case member 3 . A protective mat 51 having cushioning properties is arranged in the gap. Two through holes 511 are formed in the protective mat 51 at positions overlapping the two through holes 31 of the case member 3 . The two through holes 511 are provided so as to face each other. The sub-catalyst 5 has an internal flow path through which the exhaust gas passes. The internal flow path of the sub-catalyst 5 extends along the central axis of the case member 3 .

The main catalyst 4 and the sub-catalyst 5 purify the exhaust gas by reforming or capturing harmful substances such as CO, HC, NOx, etc. in the exhaust gas through contact with the exhaust gas. The main catalyst 4 and the sub-catalyst 5 have a catalyst carrier having a lattice structure. The catalyst carrier extends along the central axis A of the outer shell member 1 or the central axis of the case member 3, and has a large number of holes penetrating through the catalyst carrier, promoting oxidation and reduction of harmful substances in the exhaust gas. It carries precious metals. The noble metal is, for example, Pt, Pd, Rh, or the like. A large number of holes penetrating through the catalyst carrier are internal flow paths formed in the main catalyst 4 and the sub-catalyst 5 through which the exhaust gas passes. The cross sections of the numerous holes perpendicular to the central axis A of the outer shell member 1 or the central axis of the case member 3 may have various shapes such as triangular, quadrangular, hexagonal, and octagonal shapes. The catalyst carrier is made of a conductive porous ceramic material such as carbon silicon ceramic. Instead of the ceramic material, for example, an electrically heated catalyst (hereinafter also referred to as EHC (Electrically Heated Catalyst)) having a catalyst carrier made of a conductive metal material may be used. In this embodiment, the sub-catalyst 5 is used as an EHC that is heated by energization. The main catalyst 4 may be configured to have conductivity or may have a configuration that does not have conductivity.

In this embodiment, the sub-catalyst 5 is provided upstream of the main catalyst 4 . In this embodiment, the main catalyst 4 and the sub-catalyst 5 at the first position, which will be described later, are arranged coaxially with the central axis A of the outer shell member 1 . Here, coaxial means that the central axis A and the central axes of the main catalyst 4 and the sub-catalyst 5 substantially coincide. Specifically, the main catalyst 4 and the sub-catalyst 5 at a first position, which will be described later, are arranged coaxially with the central axis of the inlet portion 14 of the outer shell member 1 . The central axis of the inlet portion 14 and the central axis of the case member 3 are aligned when the sub-catalyst 5 is at a first position described later, and are substantially perpendicular when the sub-catalyst 5 is at a second position described later. cross. When the case member 3 is positioned inside the outer shell member 1 so that the central axis of the inlet portion 14 and the central axis of the case member 3 are aligned, the upstream end of the case member 3 and the outer shell member 1 are in contact with each other. or come close. As a result, the gap between the upstream end of the case member 3 and the outer shell member 1 becomes infinitely small.

In the present embodiment, the main catalyst 4 has a larger cross-sectional area than the sub-catalyst 5 in a cross section perpendicular to the flow direction of the exhaust gas. Specifically, the diameter D1 of the sub-catalyst 5 is smaller than the diameter D2 of the main catalyst 4 . Also, the diameter D1 of the sub-catalyst 5 is substantially the same as or slightly smaller than the inner diameter d1 of the inlet portion 14 . In addition, in this embodiment, the inner diameter of the case member 3 is substantially the same as the inner diameter d1 of the inlet portion 14 . Also, the length L of the internal channel of the sub-catalyst 5 is smaller than the diameter D2 of the main catalyst 4 . In addition, the length L of the internal flow path of the sub-catalyst 5 is substantially the same as the length of the case member 3 .

The support member 6 is a straight member in the shape of a round bar. The two support members 6 are slidably attached to the outer shell member 1 via the bearings 2 so that their central axes are aligned with each other. In this embodiment, the support member 6 rotates and slides about the axis of the support member 6 with respect to the bearing 2 . The end portions of the two supporting members 6 inserted into the outer shell member 1 are inserted into the two through holes 31 of the case member 3 and the two through holes 511 of the protective mat 51 and joined to the sub-catalyst 5. . The two through-holes 31 of the case member 3 and the two through-holes 511 of the protective mat 51 allow the support member 6 to join the sub-catalyst 5 arranged in the case member 3 without contacting the case member 3 . It is possible. In this way, the support member 6 is joined to the sub-catalyst 5 in a state in which the support member 6 is slidably attached to the outer shell member 1 via the bearing 2 , so that the support member 6 is attached to the sub-catalyst 5 within the outer shell member 1 . A sub-catalyst 5 is supported so that its position can be displaced.

The support member 6 is made of, for example, a conductive material such as stainless steel. One of the two support members 6 functions as a positive electrode to which a positive voltage is applied, and the other functions as a negative electrode to which a negative voltage is applied. Electricity is supplied through the support member 6 .

Specifically, the support member 6 has an electrode layer 61 at the end inserted inside the shell member 1 . The electrode layer 61 has a thin plate shape with a substantially uniform thickness that extends in a curved shape along the outer peripheral surface of the sub-catalyst 5 . The electrode layer 61 is made of a conductive material. For example, the electrode layer 61 may be formed by spraying a conductive material onto the outer peripheral surface of the sub-catalyst 5 . In this embodiment, the electrode layers 61 are joined to the two support members 6 respectively, and the two electrode layers 61 are arranged along the outer peripheral surface of the sub-catalyst 5 with a gap so as to face each other. Therefore, when a voltage is applied to each of the two support members 6 , the voltage is applied to the entire sub-catalyst 5 via the electrode layers 61 formed at the ends of each support member 6 .

Actuator 7 is a motor for swinging support member 6 . In this embodiment, the actuator 7 rotates the support member 6 around the axis of the support member 6 based on the rotational motion of the motor. The actuator 7 is controlled to rotate the support member 6, for example, when the temperature of the main catalyst 4 reaches a predetermined value.

[2. Regarding the displacement of the position of the sub-catalyst]
In this embodiment, the support member 6 rotates about the axis of the support member 6 with respect to the bearing 2 . Therefore, the sub-catalyst 5 rotates together with the case member 3 in the outer shell member 1 with the support member 6 as a reference. Specifically, the sub-catalyst 5 rotates with the support member 6 as a reference, thereby being displaced between a first position shown in FIGS. 1 and 2 and a second position shown in FIGS. In this embodiment, when the temperature of the main catalyst 4 is less than the predetermined value, the sub-catalyst 5 is positioned at the first position. When the temperature of the main catalyst 4 reaches or exceeds a predetermined value, the sub-catalyst 5 is displaced from the first position to the second position by controlling the actuator 7 .

The first position is a position where the exhaust gas passes through the internal channel of the sub-catalyst 5 . Specifically, at the first position, one end face of the sub-catalyst 5 faces the inlet portion 14 and the other end face of the sub-catalyst 5 faces the upstream end face of the main catalyst 4 . That is, the internal flow path of the sub-catalyst 5 extends along the central axis A of the outer shell member 1 when the sub-catalyst 5 is at the first position. When the sub-catalyst 5 is at the first position as described above, the case member 3 is not positioned between the sub-catalyst 5 and the inlet portion 14 which is the inlet for the exhaust gas. Specifically, when the sub-catalyst 5 is at the first position, the central axis of the inlet portion 14 and the central axis of the case member 3 are aligned, and the upstream end of the case member 3 contacts the outer shell member 1. Or come close. As a result, a large gap does not occur between the upstream end of the case member 3 and the outer shell member 1, so that the exhaust gas that has flowed in from the inlet 14 is less likely to leak through the gap. Therefore, when the sub-catalyst 5 is at the first position, the exhaust gas passes through the sub-catalyst 5 and flows into the outer shell member 1 as indicated by arrows in FIGS. The channel through which the exhaust gas flows when the sub-catalyst 5 is in the first position, that is, the internal channel of the sub-catalyst 5 is orthogonal to the central axis of the support member 6 which is the rotation axis of the sub-catalyst 5 .

The second position is a position at which the exhaust gas is less likely to pass through the internal flow path of the sub-catalyst 5 than at the first position. Specifically, at the second position, both end surfaces of the sub-catalyst 5 face the inner peripheral surface of the outer shell member 1 . That is, when the sub-catalyst 5 is at the second position, the internal flow path of the sub-catalyst 5 extends perpendicular to the central axis A of the outer shell member 1 . Thus, when the sub-catalyst 5 is at the second position, the degree of blockage of the inlet portion 14 by the case member 3 is greater than when the sub-catalyst 5 is at the first position. Note that the blocking ratio does not indicate the ratio of the inlet portion 14 completely blocked by the case member 3 , but indicates the ratio of the projected area of the flow channel cross section of the inlet portion 14 where the case member 3 is projected. In this embodiment, the case member 3 is positioned between the inlet portion 14 and the sub-catalyst 5 in a state in which the case member 3 does not contact the outer shell member 1 . Specifically, when the sub-catalyst 5 is at the second position, the central axis of the inlet portion 14 and the central axis of the case member 3 are perpendicular to each other, and exhaust gas is present between the outer shell member 1 and the entire periphery of the case member 3 . A gap that becomes a flow path is generated. Therefore, when the sub-catalyst 5 is at the second position, the exhaust gas does not pass through the sub-catalyst 5 as indicated by arrows in FIGS. It passes through the gap between 3 and the shell member 1 and flows into the shell member 1 . The flow path through which the exhaust gas flows when the sub-catalyst 5 is in the second position, that is, the flow path around the sub-catalyst 5 formed by the gap between the case member 3 and the outer shell member 1 is It is perpendicular to the central axis of the supporting member 6, which is the axis.

[3. effect]
According to the embodiment detailed above, the following effects are obtained.
(3a) In this embodiment, the position of the sub-catalyst 5 can be displaced between the first position and the second position within the outer shell member 1 by the support member 6 rotated by the actuator 7 controlled based on the temperature of the main catalyst 4. is. For this reason, a flow path through which the exhaust gas passes through the inner flow path of the sub-catalyst 5 and then through the outer shell member 1, and a flow path of the exhaust gas around the sub-catalyst 5, that is, between the case member 3 and the outer shell member 1. It is possible to switch within the outer shell member 1 between the flow path passing through the gap between and passing through the outer shell member 1 . In other words, it is possible to switch whether the exhaust gas flows through the sub-catalyst 5 with a simple structure in which the sub-catalyst 5 is rotated with the support member 6 as a reference. Therefore, since the flow path can be switched within one member, the exhaust gas purification system including the exhaust gas purification device 100 can be made more compact than, for example, a configuration in which a plurality of pipes are provided to switch the flow path through which the exhaust gas flows. can do.

(3b) In the present embodiment, by rotating the sub-catalyst 5 with the supporting member 6, the passage through which the exhaust gas flows can be switched. good.

(3c) In the present embodiment, when the temperature of the main catalyst 4 reaches a predetermined value, the actuator 7 is controlled to rotate the support member 6, thereby moving the sub-catalyst 5 from the first position to the second position. Displace. Therefore, when the exhaust gas is at a high temperature, the case member 3 is arranged between the inlet portion 14 and the sub-catalyst 5 , so that the sub-catalyst 5 is less likely to be exposed to the high-temperature exhaust gas. As a result, thermal deterioration of the sub-catalyst 5 can be suppressed. Further, when the sub-catalyst 5 is at the second position, the internal flow path of the sub-catalyst 5 is perpendicular to the central axis A of the outer shell member 1 , so the inlet of the internal flow path of the sub-catalyst 5 does not face the inlet portion 14 . For this reason, when the sub-catalyst 5 is at the second position, the internal flow rate of the sub-catalyst 5 is greater than when the sub-catalyst 5 is at the first position such that the internal flow path of the sub-catalyst 5 is along the central axis A. Since it is difficult for the exhaust gas to pass through the flow path, an increase in ventilation resistance can be suppressed.

(3d) In this embodiment, the main catalyst 4 and the sub-catalyst 5 are arranged coaxially with the central axis A of the outer shell member 1 . In other words, the main catalyst 4 and the sub-catalyst 5 are arranged coaxially with the central axis of the inlet portion 14 of the shell member 1 . Therefore, when the sub-catalyst 5 is at the first position, the amount of exhaust gas flowing through the sub-catalyst 5 is greater than when the sub-catalyst 5 is not arranged coaxially with the central axis of the inlet portion 14 of the outer shell member 1, for example. It can be made easier to flow uniformly. As a result, the purification performance and exhaust performance of the sub-catalyst 5 are likely to be ensured.

Further, when the sub-catalyst 5 is at the first position, compared to the case where the main catalyst 4 is not arranged coaxially with the central axis of the inlet portion 14 of the outer shell member 1, for example, the exhaust gas flows into the main catalyst 4. It can be made easier to flow uniformly. As a result, the purification performance and exhaust performance of the main catalyst 4 are easily ensured.

(3e) In the present embodiment, since the sub-catalyst 5 and the main catalyst 4 are arranged inside the outer shell member 1, compared to a configuration in which the sub-catalyst 5 and the main catalyst 4 are arranged in separate members, An exhaust gas purification system including the purification device 100 can be downsized. Further, in the present embodiment, the sub-catalyst 5 is smaller than the main catalyst 4, so the sub-catalyst 5 is easily warmed up early.

(3f) In the present embodiment, since the main catalyst 4 and the sub-catalyst 5 are formed in a columnar shape, for example, compared to the case where the main catalyst 4 and the sub-catalyst 5 are configured in a special shape, Manufacturability can be easily ensured, and an increase in cost can be suppressed.

(3g) In this embodiment, the sub-catalyst 5 is used as an EHC that is heated by energization through the support member 6 . Therefore, the sub-catalyst 5 is heated by applying a voltage via the two support members 6 for a certain period of time after the engine of the vehicle is started. Therefore, after the engine is started, the sub-catalyst 5 is easily warmed up early, and the exhaust gas purifying action can be activated more quickly than when the sub-catalyst 5 is not an electrically heated catalyst.

In this embodiment, the case member 3 corresponds to the wall member, the main catalyst 4 corresponds to another purifying section, and the sub-catalyst 5 corresponds to the purifying section.
[4. Other embodiments]
Although the embodiments of the present disclosure have been described above, it is needless to say that the present disclosure is not limited to the above embodiments and can take various forms.

(4a) In the above embodiment, the sub-catalyst 5 is provided upstream of the main catalyst 4 in the outer shell member 1, but the position where the sub-catalyst 5 is arranged is not limited to this. For example, as shown in FIG. 9 , the sub-catalyst 5 may be arranged downstream of the main catalyst 4 in the outer shell member 1 .

(4b) In the above embodiment, the configuration in which the main catalyst 4 and the sub-catalyst 5 are arranged in the outer shell member 1 constituted by one member was illustrated, but the configuration in which the main catalyst 4 and the sub-catalyst 5 are arranged is It is not limited to this. For example, the main catalyst 4 and the sub-catalyst 5 may be arranged on different outer shell members arranged at different positions in the exhaust passage through which the exhaust gas passes. Further, for example, as shown in FIG. 10, a first outer shell member 16 on which the sub-catalyst 5 rotatably configured by the support member 6 is arranged, and a second outer shell member 17 on which the main catalyst 4 is arranged. The outer shell member may be divided and configured to be assembled. As a result, for example, a commonly designed sub-catalyst can be easily combined with various vehicles using different main catalysts.

(4c) In the above embodiment, the diameter D1 of the sub-catalyst 5 is substantially the same as or slightly smaller than the inner diameter d1 of the inlet portion 14 . However, like the sub-catalyst 5a shown in FIG. 11, the diameter D1 of the sub-catalyst 5a may be larger than the inner diameter d1 of the inlet portion 14 and smaller than the diameter D2 of the main catalyst 4. In this case, the inner diameter of the case member 3a accommodating the sub-catalyst 5a is also larger than the inner diameter d1 of the inlet portion 14 and smaller than the diameter D2 of the main catalyst 4. As shown in FIG. Instead of the diameter D1 of the sub-catalyst 5a, any one of the outer diameter of the case member 3, the inner diameter of the case member 3, and the diameter of the sub-catalyst 5 including the thickness of the protective mat 51 is larger than the inner diameter d1 of the inlet portion 14. It may be large and smaller than the diameter D2 of the main catalyst 4 .

(4d) In the above embodiment, the sub-catalyst 5 was formed in a cylindrical shape, but the shape of the sub-catalyst is not limited to this. For example, as shown in FIG. 12, the sub-catalyst 5b may be formed in an elliptical cylinder shape. Further, for example, as shown in FIG. 13, the sub-catalyst 5c may be formed in a quadrangular prism shape.

(4e) The two support members 6, which are arranged so that their central axes are aligned with each other, move in the vertical direction, the front-rear direction, the left-right direction, etc. with respect to the vehicle when the exhaust purification device 100 is attached to the vehicle. , may be arranged in various orientations. In other words, the rotation axis of the sub-catalyst 5 may be oriented in various directions when the exhaust purification device 100 is attached to the vehicle.

(4f) In the above embodiment, the displacement of the sub-catalyst 5 from the first position to the second position was exemplified by a configuration in which the position of the center of gravity of the sub-catalyst 5 did not change significantly. A configuration may be employed in which the position of the center of gravity of the sub-catalyst 5 is greatly changed by displacement. At that time, the center of gravity of the sub-catalyst 5 may deviate from the central axis A of the outer shell member 1 . For example, as shown in FIG. 14, the support member 6d has a bent rod shape so that the portion that is joined to the case member 3 and the portion that is slidably fixed to the outer shell member 1 are not arranged in the same straight line. It may be a member. The support member 6d rotates about the portion slidably fixed to the outer shell member 1, and when the position of the sub-catalyst 5 is displaced from the first position shown in FIG. 15 to the second position shown in FIG. , displaces so that the position of the portion joined to the case member 3 changes. That is, when the position of the sub-catalyst 5 is displaced, the center point B, which is the center of gravity of the sub-catalyst 5, deviates from the central axis A of the outer shell member 1 and becomes eccentric. When the sub-catalyst 5 is at the second position, the downstream end of the case member 3 abuts on or comes close to part of the inner peripheral surface of the main body 11 of the outer shell member 1 . Specifically, when the sub-catalyst 5 is at the second position, the central axis of the inlet portion 14 and the central axis of the case member 3 are perpendicular to each other, and the distance between the upstream end of the case member 3 and the main body portion 11 is A gap that becomes a flow path for the exhaust gas is generated in the Even with such a configuration, the same effects as in the present embodiment can be obtained.

(4g) In the above-described embodiment, when the sub-catalyst 5 is at the first position, the upstream end of the case member 3 contacts or approaches the outer shell member 1, so that the upstream side of the outer shell member 1 and the case member 3 A configuration is exemplified that makes it difficult to create a gap between the ends of the . However, for example, a cushioning member may be arranged between the outer shell member 1 and the upstream end of the case member 3 . For example, as shown in FIG. 17, the case member 3e has a contact portion 32 at the end on the upstream side, and a metal mesh, for example, is provided as a buffer member 8 between the contact portion 32 and the outer shell member 1. The configuration may be such that

(4h) In the above embodiment, the outer member 1 extends linearly along the direction in which the exhaust gas flows, but the shape of the outer member 1 is not limited to this. For example, as shown in FIG. 18, the outer shell member 1f may have a configuration in which the central axis C of the inlet portion 14f and the central axis D of the main body portion 11f are not coaxial. It is preferable that the central axis of the sub-catalyst 5 arranged in the outer shell member 1f be coaxial with the central axis C of the inlet portion 14f.

(4i) In the above embodiment, the EHC sub-catalyst was exemplified as the purifier, but the purifier may not be an EHC. In other words, the sub-catalyst may not be heated by energization. For example, the purifier may be an adsorbent that adsorbs HC contained in the exhaust gas without reactions such as oxidation and reduction of harmful substances in the exhaust gas. Further, for example, the purifier may be made of a non-conductive ceramic material such as cordierite. In this case, the support member does not have to be made of a conductive material. Also, the bearing into which the support member is inserted may not be made of an insulating material. That is, the bearing may be made of a conductive material such as metal mesh, for example. Further, the protection mat and the case member may not have through-holes, and the support member may be directly joined to the case member.

(4j) In the above embodiment, the support member 6 rotated by the actuator 7 is used to displace the position of the sub-catalyst 5 within the outer shell member 1. However, the method of driving the support member is not limited to rotation. do not have. For example, as shown in FIGS. 19 and 20, the position of the sub-catalyst 5 may be displaced by linearly moving the supporting member 6g by the actuator 7g. Specifically, the sub-catalyst 5 is moved along the central axis A of the outer shell member 1 in a direction away from the inlet portion 14 to be displaced from the first position to the second position. In such a configuration, when the sub-catalyst 5 is at the second position, the upstream end of the case member 3 that has been in contact with or close to the outer shell member 1 moves away from the outer shell member 1 , thereby separating from the case member 3 . A gap is formed between the outer shell member 1 and the exhaust gas flow path. Therefore, the exhaust gas flowing in from the inlet portion 14 also flows into the gap between the case member 3 and the outer shell member 1, so the amount of exhaust gas flowing into the internal flow path of the sub-catalyst 5 is reduced.

(4k) In the above embodiment, the configuration for transmitting the rotational motion of the motor in the actuator 7 to the rotational motion of the sub-catalyst 5 with the support member 6 as a reference was exemplified, but a method of rotating the sub-catalyst 5 with the support member 6 as a reference. is not limited to this. For example, a method of transmitting linear motion by a thermostat or the like to rotational motion of the sub-catalyst 5 with the support member 6 as a reference may be used. Specifically, a link mechanism, a rack and pinion mechanism, or the like that converts linear motion into rotary motion may be used.

(4l) In the above embodiment, the sub-catalyst 5 is displaced by driving the support member 6 by controlling the actuator 7 based on the temperature of the main catalyst 4. It is not limited. That is, the factor used for controlling the actuator 7 is not limited to the temperature of the main catalyst 4 . Actuator 7 may, for example, be controlled using the temperature of the exhaust gas. When the temperature of the exhaust gas is used to control the actuator 7, it is desirable to use the temperature of the exhaust gas after passing through the main catalyst 4 as a factor used for control. The actuator 7 may be controlled, for example, based on the flow rate, pressure, etc. of the exhaust gas. Further, an elastic member such as a spring is used instead of the actuator 7, and the sub-catalyst 5 is displaced by driving any one of the support member 6, the sub-catalyst 5, and the case member 3 according to the flow rate of the exhaust gas. Such a configuration may be used.

(4m) The function of one component in the above embodiments may be distributed as multiple components, or the functions of multiple components may be integrated into one component. Also, 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, replaced, etc. with respect to the configuration of the other above embodiment. It should be noted that all aspects included in the technical idea specified by the wording in the claims are embodiments of the present disclosure.

1, 1f... Outer shell member 2... Bearing 3, 3e... Case member 4... Main catalyst 5, 5a, 5b, 5c... Sub catalyst 6, 6b, 6d, 6g... Support member 7, 7g... Actuator , 8... buffer member, 11, 11f... main body part, 12... upstream part, 13... downstream part, 14, 14f... inlet part, 15... outlet part, 16... first shell member, 17... second shell member, 31 , 511 through hole 32 contact portion 41, 51 protective mat 61 electrode layer 100 exhaust purification device.

Claims (6)

An exhaust purification device for purifying exhaust gas from an internal combustion engine,
an outer shell member through which exhaust gas flows;
a purification unit disposed inside the outer shell member for purifying exhaust gas;
a support member that is attached to the outer shell member and supports the cleaning unit so that the position of the cleaning unit can be displaced within the outer shell member;
with
The purifying section has a first position where the exhaust gas passes through the internal flow path formed in the purifying section by the support member, and a position where the exhaust gas passes through the internal flow path more than the first position. and a second position, which is a difficult position. The exhaust purification device according to claim 1,
The exhaust purification device, wherein the purification unit is capable of being displaced between the first position and the second position by rotating on the basis of the support member. The exhaust purification device according to claim 2,
further comprising a wall member covering at least a portion of the outer peripheral surface of the purification unit;
the wall member rotates on the basis of the support member together with the purifier, and is positioned between an exhaust gas inlet of the outer shell member and the purifier when the purifier is at the second position;
The exhaust gas purification device, wherein a blocking ratio of the inflow port by the wall member when the purification unit is at the second position is higher than when the purification unit is at the first position. The exhaust purification device according to any one of claims 1 to 3,
The exhaust purification device, wherein the purification unit is arranged coaxially with a central axis of an exhaust gas inlet in the outer shell member when the purification unit is at the first position, and the internal flow path extends along the central axis. The exhaust purification device according to any one of claims 1 to 4,
An exhaust purification device, further comprising another purification unit arranged inside the outer shell member and having a cross-sectional area perpendicular to the flow direction of the exhaust gas larger than that of the purification unit. The exhaust purification device according to any one of claims 1 to 5,
The exhaust purification device, wherein the purification unit is an electrically heated catalyst that is heated by energization, and the energization is performed via the support member.

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