JP6277489B2 - Filter device for internal combustion engine - Google Patents

Description

  The present invention relates to a filter device for an internal combustion engine provided with a particulate filter that collects particulate matter from exhaust gas of the internal combustion engine.

  As an exhaust purification device that collects particulate matter (also referred to as particulate matter) contained in exhaust gas of an internal combustion engine, a particulate filter that collects particulate matter contained in exhaust gas is provided in the exhaust passage. Is known (see, for example, Patent Document 1 and Patent Document 2). In such an exhaust purification device, when the particulate filter is clogged, particulate matter collected by, for example, a burner or an electric heater is oxidized and burned, and thereby the particulate filter is removed from the internal combustion engine. I try to play without.

  On the other hand, Patent Documents 3 to 5 disclose an apparatus for regenerating a particulate filter using heat of exhaust gas of an internal combustion engine. Among these, in Patent Document 3, a particulate filter is provided in an exhaust passage of a diesel engine equipped with a rail injection system, and post injection is executed in an expansion stroke immediately after main injection by a fuel injection valve when the filter regeneration time comes. An exhaust emission control device as described above is disclosed. In such an exhaust purification device, the combustion of the post-injected fuel accelerates the oxidation of the particulate matter collected in the particulate filter, removes the particulate matter from the particulate filter, and regenerates the particulate filter. Is done.

  Further, Patent Document 4 includes a burner device that includes a particulate filter in an exhaust pipe of a diesel engine, and injects and burns fuel upstream of the particulate filter so as to raise the temperature of the particulate filter. An exhaust purification device is disclosed. In such an exhaust purification device, oxidation of the particulate matter collected by the particulate filter is promoted by the temperature rise due to the combustion, particulate matter is removed from the particulate filter, and the particulate filter is Played. Patent Document 5 also discloses a similar technique.

Further, in Patent Document 6, a particulate filter that mainly collects particulate matter such as black smoke (soot) contained in the exhaust gas is provided in the exhaust passage of the internal combustion engine. From the particulate filter in the exhaust passage, Also disclosed is an exhaust gas purification apparatus for an internal combustion engine provided with an oxidation catalyst for promoting oxidation of a substance contained in exhaust gas by a catalytic reaction on the exhaust upstream side. In such an exhaust purification device, particulate matter contained in the exhaust gas is oxidized in the oxidation catalyst, and substances such as CO, HC, and SOF contained in the exhaust gas are oxidized to change into CO ₂ , water, etc. The exhaust gas is heated by this oxidation reaction, and the exhaust gas that has reached a high temperature flows into the particulate filter. Therefore, the oxidation of the particulate matter collected by the particulate filter is promoted, and the particulate filter removes the particulate matter from the particulate filter. The material is removed and the particulate filter is regenerated.

  Further, Patent Document 7 heats an exhaust passage by an exhaust system temperature rising device or an exhaust system extended temperature increasing device that forms a flame, and promotes, for example, fuel vaporization, oxidation catalyst activity, and the like. Or an exhaust gas purification device for an internal combustion engine that oxidizes and reduces white smoke discharged from a particulate filter.

JP-A-2-185611 JP-A-10-131740 JP 2005-248964 A JP 2010-106728 A JP 2009-167950 A JP 2005-320880 A JP 2012-241571 A

  By the way, the exhaust gas in the exhaust passage is branched and introduced into a plurality of particulate filters, the particulate matter is collected by the particulate filter, and the particulate matter is clogged using the heat of the exhaust gas. When the particulate matter of the filter is oxidized to eliminate the clogging of the particulate filter and the particulate filter is regenerated, the particulate filter is clogged due to the flow of exhaust gas, for example. There is a problem in that the degree of progress varies, and further, the degree of regeneration of the particulate filter becomes uneven, and the ability to collect particulate matter becomes unstable. Further, the exhaust gas does not easily enter the particulate filter that has been clogged in advance, and regeneration does not proceed. The exhaust gas easily enters the particulate filter that has been previously regenerated, and the exhaust gas concentrates. There is a risk that the particulate filter may break due to excessive heat load due to the heat of the exhaust gas.

  The present invention has been made paying attention to such points, and an object of the present invention is to provide a filter device for an internal combustion engine that can solve the above problems.

A filter device for a first internal combustion engine of the present invention comprises:
An exhaust gas inlet connected to an exhaust pipe of the internal combustion engine, and a first buffer tank provided with a plurality of exhaust gas outlets;
A plurality of filter containers provided with an exhaust gas inlet at one end and an exhaust gas outlet at the other end;
An exhaust gas introduction surface is provided at one end and an exhaust gas lead-out surface is provided at the other end, and the exhaust gas introduction surface communicates with the exhaust gas introduction port of the filter container and communicates with the filter containers. A surface is accommodated so as to communicate with the exhaust gas outlet of the filter container, particulate matter is collected from the exhaust gas introduced from the exhaust gas introduction surface, and the purified exhaust gas is removed from the exhaust gas lead surface. A particulate filter to derive,
The exhaust gas inlet of the first buffer tank is provided with a first restrictor for restricting exhaust gas from the exhaust pipe of the internal combustion engine,
The exhaust gas outlets of the first buffer tank are provided so as to communicate with the exhaust gas inlets of the filter containers, respectively, and the exhaust gas outlets of the first buffer tank are connected to the exhaust gas outlets of the first buffer tank. A second restrictor for restricting exhaust gas from one buffer tank;
An introduction side space is formed between the exhaust gas introduction port in each filter container and the exhaust gas introduction surface of the particulate filter,
It is a filter device for an internal combustion engine in which the introduction side space of each filter container is connected to a second buffer tank.

  The exhaust gas of the internal combustion engine enters the first buffer tank from the exhaust pipe, enters the plurality of filter containers, the particulate matter is collected by the plurality of particulate filters, and the purified exhaust gas includes the plurality of exhaust gases. Derived from the filter container. The plurality of particulate filters are clogged by the particulate matter collected therein, but the particulate matter is oxidized by the heat of the exhaust gas, thereby eliminating the clogging and regenerating. Advances. In that case, since the first buffer tank functioning as a temporary storage tank is provided instead of the pipe, the pressure difference between the plurality of exhaust gas outlets is alleviated. Further, since the flow of the exhaust gas is throttled by the first throttle part, the mixing of the exhaust gas proceeds, the temperature distribution of the exhaust gas becomes uniform, and when the fuel is mixed in the exhaust gas, for example, The mixing ratio of the exhaust gas and the fuel is made uniform. In addition, since the flow of the exhaust gas is throttled by the first throttle portion, the flow of the exhaust gas is increased and the exhaust gas is diffused to a portion far from the exhaust gas inlet of the first buffer tank. Cheap. Further, since the flow of the exhaust gas is throttled by the second throttle part, the pressure difference between the plurality of exhaust gas outlets of the first buffer tank is alleviated, and the mixing of the exhaust gas further proceeds, The temperature distribution of the exhaust gas is made more uniform, and when the exhaust gas is mixed with, for example, fuel, the mixing ratio of the exhaust gas and the fuel is made more uniform. In addition, since the flow of the exhaust gas is throttled by the second throttle part, the flow of the exhaust gas is increased and the exhaust gas diffuses in the introduction side space of the filter container, and the particulate filter It is easy to reach the outer edge of the exhaust gas introduction surface. Furthermore, the pressure in the introduction side space of each filter container is made uniform through the second buffer tank. In addition, since the second buffer tank functioning as a temporary storage tank is provided instead of the pipe, the pressure difference in the introduction side space of the plurality of filter containers is easily relieved. From the above, the temperature and flow rate of the exhaust gas flowing into the filter containers are made uniform, and the deviation of the exhaust gas introduced over the entire exhaust gas introduction surface of the particulate filter is alleviated. Therefore, in the plurality of particulate filters, the progress of clogging is made uniform, the progress of regeneration is made uniform, the ability to collect particulate matter is maintained well, and some of the particulates The possibility that the exhaust gas concentrates on the filter and the particulate filter breaks due to excessive heat load is reduced.

According to a second internal combustion engine filter device of the present invention, in the first internal combustion engine filter device,
In the internal combustion engine filter device, the second buffer tank is provided outside the first buffer tank so as to surround the first buffer tank.

  In this case, the temperature of the exhaust gas in the first buffer tank is prevented from being lowered by the heat insulating action or the heat retaining action of the second buffer tank. In addition, the first buffer tank and the second buffer tank can be made compact as a whole.

According to a third internal combustion engine filter device of the present invention, in the first or second internal combustion engine filter device,
The introduction-side space of each filter container is connected to the second buffer tank via a communication pipe,
The second throttle portion is a filter device for an internal combustion engine that passes through a central portion of the communication pipe and opens toward a central portion of the exhaust gas introduction surface of the particulate filter.

  In this way, since the exhaust gas passing through the second throttle portion is led out toward the central portion of the exhaust gas introduction surface of the particulate filter, the particulates collected by the particulate filter Since the oxidation of the substance proceeds from the central part of the particulate filter and spreads toward the outer edge, the possibility of leaving a clogged portion is reduced, and the regeneration of the particulate filter is performed quickly and efficiently. Done. Further, since the second throttle portion communicates with the introduction-side space through the central portion of the communication pipe, the opening on the introduction-side space side of the second throttle portion and the introduction-side space side of the communication pipe Accordingly, the pressure in the introduction side space of each filter container is made uniform through the second buffer tank efficiently.

According to a fourth internal combustion engine filter device of the present invention, in any one of the first to third internal combustion engine filter devices,
The first buffer tank is formed to be long along one direction,
The filter device for an internal combustion engine, wherein the plurality of exhaust gas outlets of the first buffer tank are arranged at intervals along a longitudinal direction that is the one direction.

  Even if the filter device of the internal combustion engine is in such a form, the action obtained by the filter devices of the first to third internal combustion engines is exhibited.

According to a fifth internal combustion engine filter device of the present invention, in any one of the first to fourth internal combustion engine filter devices,
A filter device for an internal combustion engine, wherein the exhaust pipe is provided with a heat source for generating heat.

  In this way, since the exhaust gas is heated by the heat source in the exhaust pipe, the exhaust gas having a higher temperature is introduced into the particulate filter of each filter container. Therefore, the effects obtained by the filter devices of the first to third internal combustion engines are exhibited, the progress of regeneration is further improved in the plurality of particulate filters, and the particulate matter collecting ability is good. In addition, the risk that the particulate filter breaks due to an excessive heat load even though the exhaust gas temperature tends to increase is reduced.

  In the filter device of the first internal combustion engine of the present invention, the temperature and flow rate of the exhaust gas flowing into the filter containers are made uniform, and further introduced over the entire exhaust gas introduction surface of the particulate filter. Since the deviation of the exhaust gas is alleviated, the progress of clogging in the plurality of particulate filters can be made uniform, the progress of regeneration is made uniform, and the particulate matter collecting ability is maintained well. In addition, it is possible to reduce the possibility that the particulate filter breaks due to excessive heat load.

  The filter device for the second internal combustion engine of the present invention prevents the temperature of the exhaust gas of the first buffer tank from lowering in addition to obtaining the effect obtained by the filter device for the first internal combustion engine. In addition, the first buffer tank and the second buffer tank can be made compact as a whole.

  In the third internal combustion engine filter device of the present invention, the effect obtained by the filter device of the first or second internal combustion engine can be obtained, and further, the portion clogged by each of the particulate filters. Therefore, the particulate filter can be regenerated quickly and efficiently. Further, the pressure in the introduction-side space of each filter container can be made uniform efficiently through the second buffer tank.

In the fourth internal combustion engine filter device of the present invention, the first buffer tank is formed to be elongated in one direction, and the plurality of exhaust gas outlets of the first buffer tank are in the one direction. Although arranged along the longitudinal direction at intervals, the effect obtained by the filter device of any one of the first to third engines can be obtained even in that case.

  According to the fifth internal combustion engine filter device of the present invention, in addition to the effects obtained by any one of the first to fourth internal combustion engine filter devices, the exhaust pipe further includes the above-described effect. Since the exhaust gas is heated by the heat source, the exhaust gas having a higher temperature is introduced into the particulate filter of each filter container, and the degree of regeneration can be further improved in the plurality of particulate filters. At the same time, the ability to collect particulate matter can be maintained well, and the particulate filter can be prevented from cracking due to excessive heat load even though the exhaust gas temperature tends to increase. Can do.

FIG. 1 is a cross-sectional view showing an embodiment of a filter device for an internal combustion engine of the present invention.

  FIG. 1 shows an embodiment of a filter device for an internal combustion engine of the present invention. The internal combustion engine (not shown except for the exhaust pipe) of this embodiment is a known diesel engine provided with a reciprocating piston mechanism. This internal combustion engine includes a cylinder and a piston slidably inserted into the cylinder, and a combustion chamber is formed on the top surface side of the piston in the cylinder. The internal combustion engine is provided with an intake pipe having one end connected to the combustion chamber and the other end open to the atmosphere to supply fresh air to the combustion chamber. Further, the internal combustion engine is provided with an exhaust pipe 700 that has one end connected to the combustion chamber and the other end open to the atmosphere, and leads exhaust gas discharged from the combustion chamber to the outside. The combustion method is a direct injection type, and a common rail injection system is adopted. That is, fuel that has been made high pressure by the supply pump is stored inside a rail as an accumulator, and an appropriate injection amount is injected into the combustion chamber of each cylinder from an injector provided in the cylinder head in a timely manner under ECU control. I have to. The ECU control is performed by a fuel injection controller. However, the internal combustion engine which is the subject of the present invention is not limitedly interpreted by the internal combustion engine of this embodiment. The internal combustion engine which is the subject of the present invention may be an internal combustion engine in which fuel pressurized by a mechanical fuel injection pump is injected into the combustion chamber from an injector provided in a cylinder head. Further, it may be an internal combustion engine such as a sub-chamber type (pre-combustion chamber type / vortex chamber type) diesel engine, or an internal combustion engine such as a diesel engine that performs fuel injection by a unit injector type or the like. Good. The internal combustion engine that is the subject of the present invention includes, for example, a rotary engine, and also includes, for example, a gasoline engine in which fuel is directly injected into a cylinder, or other gasoline engines. The internal combustion engine that is the subject of the present invention includes an internal combustion engine that is mounted on an automobile or other transportation equipment, and an internal combustion engine that is stationary on a site as exemplified by an internal combustion engine for driving a power generator. Also, an internal combustion engine in which supplementary fuel is supplied to the exhaust pipe by post injection to the cylinder, fuel injection to the exhaust pipe, etc., and oxidation of substances contained in the exhaust gas to the exhaust pipe is promoted by catalytic reaction Also included is an internal combustion engine with an oxidizing catalyst. For convenience of explanation, the flow of exhaust gas is referred to as exhaust flow, the upstream side along the exhaust flow is referred to as exhaust upstream side, and the downstream side is referred to as exhaust downstream side.

  A first buffer tank 100 is disposed on the exhaust downstream side of the exhaust pipe 700. Since the first buffer tank 100 functions as a tank for temporarily storing the exhaust gas flowing from the exhaust pipe 700, the first buffer tank 100 has a sufficient capacity to exert its function. Further, inside the first buffer tank 100, a flow path that is the same as or smaller than a flow path cross-sectional area of the first throttle section 400 described later and a flow path cross-sectional area of the second throttle section 500 described later. It is comprised so that there may be no site | part of a cross-sectional area. The first buffer tank 100 is provided with an exhaust gas inlet 110 connected to the exhaust pipe 700 of the internal combustion engine and a plurality of exhaust gas outlets 120. The internal space of the first buffer tank 100 is formed with good visibility so that the end portion can be seen when viewed from the exhaust gas inlet 110. For example, the internal space may be curved or the internal space may be curved. May be branched.

  A plurality of filter containers 200 are arranged on the exhaust downstream side of the first buffer tank 100. Each filter container 200 is formed in a cylindrical shape whose both ends are closed, and an exhaust gas inlet 210 is provided at one end of each filter container 200 and at the other end of each filter container 200. An exhaust gas outlet 220 is provided. In the case of this embodiment, each filter container 200 is formed in a cylindrical shape, but may be formed in, for example, a rectangular tube shape or other shapes.

  Each filter container 200 houses a particulate filter 300. Each of the particulate filters 300 is formed in a columnar shape in which both end surfaces are circular planes and side surfaces are formed into curved surfaces by generating lines. For example, both end surfaces are polygonal planes and side surfaces are folded surfaces. It may be formed in a prismatic shape formed by or other shapes. An exhaust gas introduction surface 310 is provided at one end of the particulate filter 300, and an exhaust gas outlet surface 320 is provided at the other end of the particulate filter 300. Then, particulate matter is collected from the exhaust gas introduced from the exhaust gas introduction surface 310, and the purified exhaust gas is led out from the exhaust gas lead-out surface 320. In each particulate filter 300, the exhaust gas introduction surface 310 communicates with the filter container 200, the exhaust gas introduction surface 210 communicates with the exhaust gas inlet 210 of the filter container 200, and the exhaust gas outlet surface 320 communicates with the exhaust gas of the filter container 200. It is accommodated so as to communicate with the gas outlet 220. In this embodiment, the particulate filter 300 is sealed in the filter container 200 such that the outer peripheral edge of the exhaust gas introduction surface 310 and the outer peripheral edge of the exhaust gas outlet surface 320 are airtight on the inner surface of the filter container 200, respectively. Thus, exhaust gas introduced from the exhaust gas inlet 210 of the filter container 200 enters the exhaust gas introduction surface 310 of the particulate filter 300 and enters the interior of the particulate filter 300. Thus, the exhaust gas in which the particulate matter is collected exits from the exhaust gas outlet surface 320 to the exhaust gas outlet 220 of the filter container 200. However, this does not limit the structure for attaching the particulate filter to the filter container. The particulate filter 300 is a so-called sealing type. The particulate filter 300 is a so-called honeycomb body made of ceramic and having a plurality of cells partitioned by partition walls, in which the honeycombs are alternately closed one by one, and the exhaust gas passes through the wall. Particulate matter is collected as it passes through. In the exhaust gas introduction surface 310 of the particulate filter 300, the end faces of the cells are alternately closed in a checkered pattern by a sealing material, and the exhaust gas lead-out surface 320 is blocked by the exhaust gas introduction surface 310. The opened cells are open, and the cells opened at the exhaust gas introduction surface 310 are closed with a sealing material. Other examples of the particulate filter include a porous material type and a fiber type, which are made of a material such as metal, for example, and the particulate matter is generated when the exhaust collides with the porous material or the fiber structure. Is configured to collect. However, the structure of the particulate filter that is the subject of the present invention is not limited to this embodiment, and any structure that exhibits a function of collecting particulate matter contained in the exhaust gas may be used.

  The exhaust gas inlet 110 of the first buffer tank 100 is provided with the first restrictor 400 that restricts exhaust gas from the exhaust pipe of the internal combustion engine. The flow path area of the first throttle 400 is smaller than the flow area immediately upstream of the first throttle 400 and smaller than the flow area immediately downstream of the exhaust. Therefore, the first throttle unit 400 increases the flow velocity of the exhaust flow by restricting the flow of the exhaust gas.

  Each exhaust gas outlet 120 of the first buffer tank 100 is provided so as to communicate with the exhaust gas inlet 210 of each filter container 200. Each exhaust gas outlet 120 of the first buffer tank 100 is provided with the second restrictor 500 that restricts the exhaust gas from the first buffer tank 100. The second throttle unit 500 has a channel area that is smaller than the channel area immediately upstream of the second throttle unit 500 and is smaller than the channel area immediately downstream of the exhaust. Therefore, the second restricting unit 500 increases the flow velocity of the exhaust flow by restricting the flow of the exhaust gas.

  An introduction-side space 230 is formed between the exhaust gas inlet 210 in each filter container 200 and the exhaust gas introduction surface 310 of the particulate filter 300.

  The introduction side space 230 of each filter container 200 is connected to the second buffer tank 600. The second buffer tank 600 functions as a tank for temporarily storing the exhaust gas flowing from any of the introduction-side spaces 230, and thus has a sufficient capacity to exhibit its function. The internal space of the second buffer tank 600 is formed with good visibility so that the other end can be seen when viewed from one end in the internal space. For example, the internal space may be curved or the internal space may be branched. You may do it.

  The second buffer tank 600 is provided outside the first buffer tank 100 so as to surround the first buffer tank 100. That is, in a structure in which two cylindrical bodies having different thicknesses are arranged in a double manner, the inner space of the inner cylindrical body forms the inner space of the first buffer tank 100, and the inner cylindrical body And the outer cylindrical body form an inner space of the second buffer tank 600. The exhaust gas inlet 110 of the first buffer tank 100 is provided at one end of the inner cylindrical body, and the other end of the inner cylindrical body is closed. Further, the gap between one end of the outer cylindrical body and the one end of the inner cylindrical body is closed, and the other end of the outer cylindrical body is closed. The plurality of exhaust gas outlets 120 of the first buffer tank 100 are provided on the side surface of the inner cylindrical body. Further, communication portions of the second buffer tank 600 to the plurality of filter containers 200 are provided on the side surfaces of the outer cylindrical body. The other end of the inner cylindrical body and the other end of the outer cylindrical body are separated from each other, and a part of the internal space of the second buffer tank 600 is formed therebetween. The two cylindrical bodies are each formed in a cylindrical shape, but may be formed in, for example, a rectangular tube shape or other shapes.

  The introduction-side space 230 of each filter container 200 is connected to the second buffer tank 600 via a communication pipe 610. The second throttle portion 500 passes through the central portion of the communication pipe 610 and opens toward the central portion of the exhaust gas introduction surface 310 of the particulate filter 300.

The first buffer tank 100 is formed to be long along one direction. The plurality of exhaust gas outlets 120 of the first buffer tank 100 are arranged at intervals along the longitudinal direction which is the one direction.

  The exhaust pipe 700 is provided with a heat source 800 that generates heat. In this embodiment, the heat source 800 is a heater that mixes and burns fuel and air, and heats the exhaust gas that passes through the exhaust pipe 700 by the combustion heat. 900 is a diffusion plate for diffusing the exhaust flow over the entire flow path inside the exhaust pipe 700 by applying an exhaust flow of the exhaust gas heated by the heat source. The apparatus includes an embodiment in which the diffusion plate is not provided. The heat source may be, for example, a heater that burns a mixture of fuel and air or a combustible gas and heats the exhaust gas that passes through the exhaust pipe by the combustion heat. As another heat source, exhaust gas passing through the inside of the exhaust pipe by combustion heat supplied to the exhaust pipe by supplying supplementary fuel by post injection to the cylinder, fuel injection to the exhaust pipe, etc. There are heating means for heating the catalyst, an oxidation catalyst for promoting oxidation of a substance contained in the exhaust gas by a catalytic reaction, or other means.

  Therefore, in the filter device for an internal combustion engine according to the embodiment and the modification thereof, the exhaust gas of the internal combustion engine enters the first buffer tank 100 from the exhaust pipe 700, enters the plurality of filter containers 200, and the plurality of the plurality. Particulate matter is collected by the particulate filter 300 and the purified exhaust gas is led out from the plurality of filter containers 200. The plurality of particulate filters 300 are clogged by the particulate matter collected therein, but the particulate matter is oxidized by the heat of exhaust gas, thereby eliminating the clogging. Playback proceeds. In that case, since the first buffer tank 100 functioning as a temporary storage tank is provided instead of the pipe, the pressure difference between the plurality of exhaust gas outlets 120 is alleviated. Further, since the flow of the exhaust gas is throttled by the first throttle unit 400, when the exhaust gas is mixed, the temperature distribution of the exhaust gas is made uniform, and when the fuel is mixed with the exhaust gas, for example. The mixing ratio of the exhaust gas and the fuel is made uniform. In addition, since the flow of the exhaust gas is throttled by the first throttle unit 400, the flow of the exhaust gas is increased, and the exhaust gas is far from the exhaust gas introduction port 110 of the first buffer tank 100. Easy to diffuse. In addition, since the flow of exhaust gas is throttled by the second throttle unit 500, the pressure difference between the plurality of exhaust gas outlets 120 of the first buffer tank 100 is alleviated and the exhaust gas is mixed. Further, the temperature distribution of the exhaust gas is further uniformed, and when the exhaust gas is mixed with, for example, fuel, the mixing ratio of the exhaust gas and the fuel is further uniformized. In addition, the flow of the exhaust gas is throttled by the second throttle unit 500, whereby the flow of the exhaust gas is increased and the exhaust gas diffuses in the introduction side space of the filter container 200, and the particulates. It is easy to reach the outer edge of the exhaust gas introduction surface 310 of the filter 300. Further, the pressure in the introduction side space 230 of each filter container 200 is made uniform through the second buffer tank 600. In addition, since the second buffer tank 600 that functions as a temporary storage tank is provided instead of the pipe, the pressure difference in the introduction-side space 230 of the plurality of filter containers 200 is easily reduced. From the above, the temperature and flow rate of the exhaust gas flowing into the filter containers 200 are made uniform, and the deviation of the exhaust gas introduced over the entire exhaust gas introduction surface 310 of the particulate filter 300 is further reduced. Therefore, the progress of clogging in the plurality of particulate filters 300 is made uniform, the progress of regeneration is made uniform, the ability to collect particulate matter is maintained well, and partly The risk that exhaust gas concentrates on the particulate filter 300 and the particulate filter 300 breaks due to excessive heat load is reduced.

  In the filter device for an internal combustion engine of the present invention, the first buffer tank and the second buffer tank may be provided independently, or the first buffer tank and the second buffer tank are connected and provided. Even at times, the structure is not limited. Among such various embodiments, in the case of the filter device for an internal combustion engine according to the above embodiment and the above modification, the first buffer tank 100 is enclosed outside the first buffer tank 100 so as to surround the first buffer tank 100. Two buffer tanks 600 are provided. In this case, the temperature of the exhaust gas in the first buffer tank 100 is prevented from being lowered by the heat insulating action or the heat retaining action of the second buffer tank 600. In addition, the first buffer tank 100 and the second buffer tank 600 can be made compact as a whole.

  In the filter device for an internal combustion engine of the present invention, the exhaust gas outlets of the first buffer tank are provided so as to communicate with the exhaust gas inlets of the filter containers, respectively, and the introduction of the filter containers is performed. The side spaces only need to be connected to the second buffer tank, respectively, and these connection structures are not limited. Therefore, for example, the exhaust gas outlets of the first buffer tank are connected to the exhaust gas inlets of the filter containers by a first pipe, respectively, and the introduction space of the filter containers is Two pipes may be connected to the second buffer tank, respectively. Among such various embodiments, in the case of the filter device of the internal combustion engine of the above embodiment and the above modification, the introduction side space 230 of each of the filter containers 200 is respectively connected to the first through the communication pipe 610. 2, which is connected to the buffer tank 600, and the second throttle portion 500 passes through the central portion of the communication pipe 610 and opens toward the central portion of the exhaust gas introduction surface 310 of the particulate filter 300. . In this way, the exhaust gas passing through the second throttle unit 500 is led out toward the central portion of the exhaust gas introduction surface 310 of the particulate filter 300, and is thus collected by the particulate filter 300. Since the oxidation of the particulate matter progressed from the central portion of the particulate filter 300 and spread toward the outer edge, the possibility that a clogged portion remains is reduced, and the particulate filter 300 is regenerated. Is performed quickly and efficiently. Further, since the second throttle portion 500 communicates with the introduction side space 230 through the central portion of the communication pipe 610, the opening on the introduction side space side of the second throttle portion 500 and the communication pipe 610 are connected. Since the opening on the introduction side space side approaches, the pressure in the introduction side space 230 of each filter container 200 through the second buffer tank 600 is efficiently made uniform.

In the internal combustion engine filter device of the present invention, the shape or structure of the first buffer tank is not limited. Among such various embodiments, in the case of the filter device of the internal combustion engine of the above embodiment and the above modified example, the first buffer tank 100 is formed to be elongated along one direction, and the above The plurality of exhaust gas outlets 120 of the first buffer tank 100 are arranged at intervals along the longitudinal direction which is the one direction. Even if the filter device of the internal combustion engine is in such a form, the above-described operation is exhibited, and the above-described effect can be obtained.

  The filter device for an internal combustion engine of the present invention includes an embodiment in which no heat source is provided in the exhaust pipe. Among such various embodiments, in the case of the filter device of the internal combustion engine of the above embodiment and the above modification, the exhaust pipe 700 is provided with the heat source 800 that generates heat. In this way, since the exhaust gas is heated by the heat source 800 in the exhaust pipe 700, the exhaust gas having a higher temperature is introduced into the particulate filter 300 of each filter container 200. Therefore, the operation described above is exhibited, the effect described above is obtained, the progress of regeneration is further improved in the plurality of particulate filters 300, and the particulate matter collecting ability is maintained well. In addition, although the exhaust gas temperature tends to be high, the risk that the particulate filter 300 will break under an excessive heat load is reduced.

  The filter device for an internal combustion engine of the present invention includes an embodiment in which the features of the above-described embodiment and the modification described above are combined. Furthermore, the above-described embodiment and the above-described modification described above are only some examples of the filter device for the internal combustion engine of the present invention. Therefore, the filter device for an internal combustion engine of the present invention is not limitedly interpreted by the description of the above embodiment and the above modification.

DESCRIPTION OF SYMBOLS 100 1st buffer tank 110 Exhaust gas inlet 120 Exhaust gas outlet 200 Filter container 210 Exhaust gas inlet 220 Exhaust gas outlet 230 Inlet side space 300 Particulate filter 310 Exhaust gas inlet surface 320 Exhaust gas outlet surface 400 First throttle Part 500 Second throttle part 600 Second buffer tank 610 Communication pipe 700 Exhaust pipe 800 Heat source

Claims (5)

An exhaust gas inlet connected to an exhaust pipe of the internal combustion engine, and a first buffer tank provided with a plurality of exhaust gas outlets;
A plurality of filter containers provided with an exhaust gas inlet at one end and an exhaust gas outlet at the other end;
An exhaust gas introduction surface is provided at one end and an exhaust gas lead-out surface is provided at the other end, and the exhaust gas introduction surface communicates with the exhaust gas introduction port of the filter container and communicates with the filter containers. A surface is accommodated so as to communicate with the exhaust gas outlet of the filter container, particulate matter is collected from the exhaust gas introduced from the exhaust gas introduction surface, and the purified exhaust gas is removed from the exhaust gas lead surface. A particulate filter to derive,
The exhaust gas inlet of the first buffer tank is provided with a first restrictor for restricting exhaust gas from the exhaust pipe of the internal combustion engine,
The exhaust gas outlets of the first buffer tank are provided so as to communicate with the exhaust gas inlets of the filter containers, respectively, and the exhaust gas outlets of the first buffer tank are connected to the exhaust gas outlets of the first buffer tank. A second restrictor for restricting exhaust gas from one buffer tank;
An introduction side space is formed between the exhaust gas introduction port in each filter container and the exhaust gas introduction surface of the particulate filter,
A filter device for an internal combustion engine, wherein the introduction side space of each filter container is connected to a second buffer tank.   The internal combustion engine filter device according to claim 1, wherein the second buffer tank is provided outside the first buffer tank so as to surround the first buffer tank. The introduction-side space of each filter container is connected to the second buffer tank via a communication pipe,
The internal combustion engine filter device according to claim 1 or 2, wherein the second throttle portion passes through a central portion of the communication pipe and opens toward a central portion of the exhaust gas introduction surface of the particulate filter. The first buffer tank is formed to be long along one direction,
The internal combustion engine filter device according to any one of claims 1 to 3, wherein the plurality of exhaust gas outlets of the first buffer tank are arranged at intervals along a longitudinal direction that is the one direction. .   The internal combustion engine filter device according to any one of claims 1 to 4, wherein the exhaust pipe is provided with a heat source for generating heat.

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