JP7421035B2 - Diesel engine exhaust treatment equipment and diesel engines - Google Patents

Description

The present invention relates to an exhaust treatment device for a diesel engine and a diesel engine.

The exhaust treatment device of a diesel engine is also called a DPF muffler, and includes a DPF (diesel particulate filter), a DOC (diesel oxidation catalyst), and the like. DPF collects PM (abbreviation for particulate matter). DOC oxidizes HC (hydrocarbons) and CO (carbon monoxide). DOC raises the temperature of exhaust gas and burns PM in the DPF. The exhaust treatment device uses a differential pressure sensor to measure pressure in order to predict the amount of PM trapped by the DPF. The differential pressure sensor detects the differential pressure between the upstream side and the downstream side of the DPF. The exhaust treatment device captures PM in the exhaust gas using the DPF, and estimates the PM accumulation amount based on the differential pressure between the upstream side and the downstream side of the DPF detected by the differential pressure sensor. When the PM accumulation amount reaches a predetermined regeneration request amount, the exhaust treatment device regenerates the DPF by raising the exhaust temperature and burning and removing the PM accumulated on the DPF.

In the exhaust treatment device, a steel pipe is assembled to the boss of a DPF assembly, and a differential pressure sensor is arranged around the DPF. The body part of the differential pressure sensor is made of resin. Because the temperature and pressure inside the exhaust treatment device is high, SUS material is used as the material for the exhaust treatment device. Also, the seal structure is metal touch. Further, in some cases, a stay is installed to suppress vibration of the steel pipe so that the steel pipe does not resonate and be damaged by vibrations of the exhaust treatment device. Patent Document 1 discloses an exhaust treatment device including a differential pressure sensor.

In the exhaust treatment device described in Patent Document 1, when assembling the steel pipes in the manufacturing process, the position of the steel pipes cannot be determined without the stay, making it difficult to assemble the steel pipes. That is, since the steel pipe is fixed in one place by the mounting screw portion of the steel pipe, the direction of rotation of the steel pipe cannot be regulated. When a stay is added to regulate the rotational direction of the steel pipe, a silver brazing process is required to fix the stay, which leads to an increase in the manufacturing cost of the exhaust treatment device.

JP2014-58896A

The present invention has been made to solve the above problems, and improves the ease of assembling piping arranged around a casing having a diesel particulate filter, thereby ensuring reliable positioning of the piping with respect to the casing. An object of the present invention is to provide a diesel engine exhaust treatment device and a diesel engine that can be easily performed.

The object is to provide an exhaust treatment device for a diesel engine, which includes a casing housing a diesel particulate filter, and piping provided around the casing, the piping being positioned with respect to the casing. This problem is solved by the diesel engine exhaust treatment device according to the present invention, which is characterized by having a linear pipe fixing member for fixing.

The diesel engine exhaust treatment device of the present invention includes a linear pipe fixing member for positioning and fixing the pipe to the casing. The ease of assembly is improved, and the positioning of the piping relative to the casing can be performed reliably and easily. The piping can be securely fixed to the casing, and the vibration resistance of the piping can be improved.

The diesel engine exhaust treatment device of the present invention preferably detects the difference between the upstream side and the downstream side of the diesel particulate filter in order to predict the amount of accumulated particulate matter captured by the diesel particulate filter. The piping further includes a differential pressure sensor that detects pressure, and the piping includes a first piping that connects the upstream side of the diesel particulate filter and the differential pressure sensor, and a first piping that connects the downstream side of the diesel particulate filter. It is characterized by having a second piping connected to the differential pressure sensor.
According to the diesel engine exhaust treatment device of the present invention, the ease of assembling the first pipe and the second pipe connected to the differential pressure sensor is improved, and the positioning of the first pipe and the second pipe with respect to the casing is ensured. Moreover, it can be done easily.

In the diesel engine exhaust treatment device of the present invention, preferably, the differential pressure sensor is connected to the first pipe by a flexible non-metal first connecting pipe, and the differential pressure sensor is connected to the first pipe by a flexible non-metal first connecting pipe. It is characterized in that it is connected to the second piping by a second connecting pipe.
According to the diesel engine exhaust treatment device of the present invention, since the flexible non-metallic first connecting pipe and the second connecting pipe damp vibrations transmitted from the first pipe and the second pipe, the first connecting pipe The vibration resistance of the differential pressure sensor connected to the pipe and the second connecting pipe can be improved.

In the diesel engine exhaust treatment device of the present invention, preferably, the linear piping fixing member is disposed along the outer circumferential surface of the casing and is disposed away from the outer circumferential surface of the casing. It is characterized by having a fixed mounting base, a first clamp part that fixes the first pipe at a plurality of places, and a second clamp part that positions and fixes the second pipe.
According to the diesel engine exhaust treatment device of the present invention, the linear pipe fixing member is disposed along the outer circumferential surface of the casing and is disposed away from the outer circumferential surface of the casing. Therefore, the heat of the casing is prevented from being directly transmitted to the linear piping fixing member, and the linear piping fixing member is prevented from becoming hot. Moreover, the linear pipe fixing member can fix the first pipe with the first clamp part while being fixed to the casing with the mounting base, and position and fix the second pipe with the second clamp part. Thereby, the first pipe and the second pipe can be securely fixed to the casing, and the vibration resistance of the first pipe and the second pipe can be improved.

In the diesel engine exhaust treatment device of the present invention, preferably, the first clamp section positions a connecting portion between the first pipe and the first connecting pipe, and the second clamp part positions the connection part between the first pipe and the first connecting pipe. and the second connecting pipe are positioned.
According to the diesel engine exhaust treatment device of the present invention, the linear pipe fixing member positions the connecting part between the first pipe and the first connecting pipe, and positions the connecting part between the second pipe and the second connecting pipe. Because of the positioning, even if the first connecting tube and the second connecting tube have flexibility, the first connecting tube and the second connecting tube can be reliably positioned with respect to the casing.

In the diesel engine exhaust treatment device of the present invention, preferably, the first clamp portion has an Ω shape that is tightly attached to the outer periphery of the first pipe.
According to the diesel engine exhaust treatment device of the present invention, the first clamp part has an Ω-shape that is tightly attached to the outer periphery of the first pipe, so that it can be removed from the first pipe by simply fitting into the first pipe. Can be attached closely along the periphery. When the cooling air from the cooling fan of the diesel engine hits the first clamp part, the first clamp part plays the role of a cooling part, so that the first pipe can be cooled.

In the diesel engine exhaust treatment device of the present invention, preferably, the linear pipe fixing member is a piano wire.
According to the diesel engine exhaust treatment device of the present invention, by using strong and lightweight piano wire as the linear pipe fixing member, the pipe fixing member securely connects the first pipe and the second pipe to the casing. The vibration resistance of the first pipe and the second pipe can be improved.

Further, the problem is a diesel engine having an exhaust treatment device for a diesel engine, which includes a casing housing a diesel particulate filter, and piping provided around the casing. The processing device is solved by the diesel engine according to the present invention, characterized in that it includes a linear pipe fixing member for positioning and fixing the pipe with respect to the casing.

According to the diesel engine of the present invention, the exhaust treatment device includes a linear pipe fixing member for positioning and fixing the pipe with respect to the casing, so that the exhaust treatment device is arranged around the casing having the diesel particulate filter. The assemblability of the piping is improved, and the positioning of the piping relative to the casing can be performed reliably and easily. The piping can be securely fixed to the casing, and the vibration resistance of the piping can be improved.

According to the present invention, the ease of assembling piping arranged around a casing having a diesel particulate filter is improved, and the piping can be reliably and easily positioned with respect to the casing for diesel engine exhaust treatment. Equipment and diesel engines can be provided.

1 is a sectional view showing an exhaust treatment device for a diesel engine according to an embodiment of the present invention. 2 is a perspective view showing a diesel engine equipped with the diesel engine exhaust treatment device shown in FIG. 1. FIG. 3 is a front view showing a diesel engine equipped with the diesel engine exhaust treatment device shown in FIG. 2. FIG. FIG. 1 is a side view showing a diesel engine equipped with a diesel engine exhaust treatment device. FIG. 3 is a perspective view showing a preferred structural example of a linear pipe fixing member.

Below, preferred embodiments of the present invention will be described in detail with reference to the drawings.
The embodiments described below are preferred specific examples of the present invention, and therefore have various technically preferable limitations. However, the scope of the present invention does not particularly limit the present invention in the following description. Unless otherwise specified, the embodiments are not limited to these embodiments. Further, in each drawing, similar components are denoted by the same reference numerals, and detailed description thereof will be omitted as appropriate.

(Example of configuration of diesel engine exhaust treatment device 1)
FIG. 1 is a sectional view showing a diesel engine exhaust treatment device according to an embodiment of the present invention.
A diesel engine exhaust treatment device 1 shown in FIG. 1 is installed, for example, in an industrial diesel engine. As an industrial diesel engine, it is installed in, for example, construction machinery, agricultural machinery, lawn mowers, etc., but the type of equipment in which the diesel engine 100 is installed is not particularly limited.

The exhaust treatment device (hereinafter referred to as the exhaust treatment device) 1 of the diesel engine 100 is also called a DPF muffler, and includes a heat-resistant metal cylindrical casing 2 and a DPF (diesel particulate filter). filter) 3, a DOC (diesel oxidation catalyst) 4, one and the other heat insulators 5, 6, an exhaust gas introduction section 7, an exhaust gas discharge section 8, and the like. The casing 2 houses the DPF 3 and the DOC 4. Exhaust gas G discharged from the diesel engine is introduced from the exhaust gas introduction part 7 into the exhaust gas flow path in the casing 2 as shown by the arrow, and is passed through the DOC 4 to raise the temperature of the exhaust gas G. When HC and CO in the exhaust gas G are oxidized and pass through the DPF 3, PM (abbreviation for particulate matter) in the exhaust gas G is collected by the DPF 3 and burned. Thereafter, the exhaust gas G is sent from the exhaust gas discharge section 8 to the exhaust system of the diesel engine 100.

(Diesel engine 100)
FIG. 2 is a perspective view showing a diesel engine 100 in which the exhaust treatment device 1 shown in FIG. 1 is mounted.
As shown in FIG. 2, the position of the casing 2 of the exhaust treatment device 1 near the heat insulating material 6 is fixed to the casing fixing part 101 of the diesel engine 100 using a bracket 9, bolts 9A, and the like. Similarly, the position of the casing 2 near the heat insulating material 5 shown in FIG. 1 is fixed to the casing fixing part 101 of the diesel engine 100 shown in FIG. 2 using a bracket 9, bolts 9A, and the like.

(Piping fixing member 20, first piping 11, and second piping 12)
Next, the linear pipe fixing member 20, the first pipe 11, and the second pipe 12 will be explained with reference to FIGS. 2 to 5.
FIG. 3 is a front view showing the diesel engine 100 in which the exhaust treatment device 1 shown in FIG. 2 is mounted.
FIG. 4 is a side view showing the diesel engine 100 in which the exhaust treatment device 1 is mounted.
FIG. 5 is a perspective view showing a preferred structural example of the linear pipe fixing member 20.

As shown in FIGS. 2 to 4, on the outer peripheral surface of the casing 2, a band 10 as a band-shaped member called a V-band is provided at a position between the heat insulating material 6 and the DPF 3 around the entire circumference of the casing 2. It is wrapped around and fixed. The band 10 is a heat-resistant metal plate material.

As shown in FIGS. 2 and 3, the casing 2 has a first pipe 11 and a second pipe 12. The first pipe 11 and the second pipe 12 are arranged around the casing 2 and are heat-resistant metal tubes. The first pipe 11 is longer than the second pipe 12. The first pipe 11 has a J-shaped curved portion 11C and a straight portion 11D. The second pipe 12 has straight portions 12C and 12D, and is formed into a substantially S-shape. The pipe fixing member 20 plays a role of positioning and fixing the first pipe 11 and the second pipe 12 around the casing 2 .

As shown in FIGS. 2 and 3, one end portion 11A of the first pipe 11 is detachably connected to a position corresponding to the DPF 3 of the casing 2. One end portion 12A of the second pipe 12 is detachably connected to a position close to the heat insulating material 6 of the casing 2. The other end 11B of the first pipe 11 is detachably connected to one end 13A of the flexible non-metallic first connecting pipe 13. The other end 12B of the second pipe 12 is detachably connected to one end 14A of a flexible non-metallic second connecting pipe 14. The first connecting tube 13 and the second connecting tube 14 are flexible non-metallic tubes such as rubber tubes. As shown in FIG. 2, the other end 13B of the first connecting pipe 13 and the other end 14B of the second connecting pipe 14 are connected to a differential pressure sensor 40.

(Differential pressure sensor 40)
The differential pressure sensor 40 shown in FIG. 2 detects the differential pressure between the upstream side and the downstream side of the DPF 3 in order to predict the amount of PM trapped by the DPF 3, which is a diesel particulate filter. The differential pressure sensor 40 obtains the pressure on the upstream side of the DPF 3 through the first pipe 11 and the first connecting pipe 13, and obtains the pressure on the downstream side of the DPF 3 through the second pipe 12 and the second connecting pipe 14. Detects the differential pressure between the upstream and downstream sides of the Then, a control unit 200 such as an engine ECU (electronic control unit) of the diesel engine 100 shown in FIG. The amount of accumulated PM is estimated, and when the amount of PM accumulated reaches a predetermined regeneration required amount, the exhaust temperature is raised to burn and remove the PM accumulated in the DPF 3, thereby regenerating the DPF 3.

(Explanation of detailed structural example of linear pipe fixing member 20)
Next, a structural example of the linear pipe fixing member 20 will be described in detail with reference to FIG.
FIG. 5 shows an example of the structure of the linear piping fixing member 20. The linear piping fixing member 20 is made of a heat-resistant metal linear member, such as piano wire, in a predetermined shape. It is made by molding so that it will not be deformed by the heat generated by the exhaust treatment device 1. For the production of piano wire, the JIS (Japanese Industrial Standards) specifies that the steel material has a higher carbon content, the harder it becomes, and it maintains a predetermined shape even at temperatures of about 200 degrees Celsius. be able to.

By using strong and lightweight piano wire as the linear pipe fixing member 20, the first pipe 11 and the second pipe 12 can be securely fixed to the casing 2, and the durability of the first pipe 11 and the second pipe 12 can be improved. Vibration can be improved. The linear pipe fixing member 20 not only has the role of positioning and fixing the first pipe 11 and the second pipe 12, which should be arranged around the casing 2, with respect to the casing 2, but also has the role of fixing the differential pressure sensor 40 and the It also serves to position the first connecting tube 13 and the second connecting tube 14, which are flexible rubber tubes, for example.

As shown in FIG. 4, the linear pipe fixing member 20 is arranged along the outer peripheral surface of the casing 2, but is arranged as far away from the outer peripheral surface of the casing 2 as possible. This prevents high-temperature heat from the casing 2 from being directly transmitted to the linear pipe fixing member 20, thereby preventing the temperature of the linear pipe fixing member 20 from rising as much as possible. The linear pipe fixing member 20 secures the first pipe 11 and the second pipe 12 to be attached, the first connecting pipe 13, the second connecting pipe 14, and the differential pressure sensor 40 on the outer peripheral surface of the casing 2. It can be stably fixed in a suspended state.

The linear pipe fixing member 20 has a mounting base 19, first clamp parts 21, 22, 23, and a second clamp part 24. The mounting base 19 and the first clamp parts 21 and 22 are preferably formed into, for example, an Ω (ohm) shape so that the first piping 11 to be mounted can be removably fitted into the mounting base and easily fixed securely. has been done. The first clamp part 23 and the second clamp part 24 are designed so that the other end 11B of the first pipe 11 and the other end 12B of the second pipe 12, which are the objects of attachment, can be detachably attached to support or fix them easily. , for example, in an L-shape or a U-shape.
However, the first clamp parts 21, 22, 23 and the second clamp part 24 may all be formed in an Ω shape, or may be formed in an L shape or a U shape. It is not limited to shape.

The attachment base 19 of the linear piping fixing member 20 shown in FIG. 5 is a part for removably fixing the linear piping fixing member 20 itself to the casing 2 side shown in FIG. 2. As shown in FIG. 2, the casing 2 has an exhaust gas temperature detection sensor 90, and the exhaust gas temperature detection sensor 90 is provided to protrude outside the casing 2 using a mounting boss 91. This exhaust gas temperature detection sensor 90 detects the exhaust gas temperature between the DOC 4 and the DPF 3.

The mounting base 19 of the linear pipe fixing member 20 may be fastened together with the mounting boss 91 of the exhaust gas temperature detection sensor 90 provided protruding from the casing 2, or may be fastened to the mounting boss 91, for example. It is fixed by fitting it into the Thereby, the linear pipe fixing member 20 can be securely and easily fixed to the casing 2 side using the mounting base 19.

The first clamp parts 21 and 22 of the linear pipe fixing member 20 shown in FIG. 5 fix each part of the first pipe 11 in a removable manner to the casing 2 so as not to move. Specifically, the first clamp part 21 is fixed by fitting a part of the straight part 11D of the first pipe 11, and the first clamp part 22 is fixed by fitting the other part of the straight part 11D of the first pipe 11. It is fixed at Thereby, the relatively long straight portion 11D of the first pipe 11 is positioned and fixed to the casing 2 by the first clamp portions 21 and 22 at two locations.

As shown in FIG. 2, the first clamp part 23 has an L-shape, for example, and supports one end of the first connecting pipe 13 while supporting the vicinity of the L-shaped other end 11B of the first pipe 11. The position of the other end portion 11B of the first pipe 11 is fixed so as to abut against the portion 13A. The other end 11B of the first pipe 11 is a connecting end with the one end 13A of the first connecting pipe 13. As a result, the other end 11B of the first pipe 11 is positioned and fixed with respect to the casing 2 by the first clamp part 23, and the position of the flexible first connecting pipe 13 with respect to the casing 2 is fixed. You can also make payments.

As shown in FIG. 2, the second clamp part 24 has an L-shape, for example, and supports one end of the second connecting pipe 14 while supporting the vicinity of the L-shaped other end 12B of the second pipe 12. The position of the other end portion 12B is fixed so as to abut against the portion 14A. The other end 12B is a connecting end with the one end 14A of the second connecting pipe 14. Thereby, the other end 12B of the second pipe 12 is positioned and fixed with respect to the casing 2 by the second clamp part 24, and the position of the flexible second connecting pipe 14 with respect to the casing 2 is fixed. You can also make payments.

As explained above, the linear pipe fixing member 20 plays the role of positioning and fixing the first pipe 11 and the second pipe 12 with respect to the casing 2. Moreover, the linear pipe fixing member 20 can position and fix the first pipe 11 and the second pipe 12 in the narrow space between the casing 2 and the diesel engine 100.

Since the linear pipe fixing member 20 can position and fix the first pipe 11 and the second pipe 12, the vibration resistance of the first pipe 11 and the second pipe 12 can be improved. Furthermore, the first connecting pipe 13 and the second connecting pipe 14 having flexibility damp the vibration transmitted from the first pipe 11 and the second pipe 12, and the first connecting pipe 13 and the second connecting pipe 14 Since the differential pressure sensor 40 connected to the diesel engine 100 can be prevented from greatly vibrating due to vibrations of the diesel engine 100, the vibration resistance of the first connecting pipe 13, the second connecting pipe 14, and the differential pressure sensor 40 can also be improved. The linear pipe fixing member 20 can also position the flexible first connecting pipe 13, the second connecting pipe 14, and the differential pressure sensor 40 with respect to the casing 2.

The linear pipe fixing member 20 is lightweight and does not occupy a large space, so the first pipe 11, the second pipe 12, the first connecting pipe 13, and the second connecting pipe 14 are suspended from the casing 2. , it can be assembled in a narrow space between the casing 2 and the diesel engine 100. Therefore, when attaching the exhaust treatment device 1 to the diesel engine 100, the workability of assembling the first pipe 11, the second pipe 12, the first connecting pipe 13, and the second connecting pipe 14 can be improved.

The linear pipe fixing member 20 allows more freedom in design for attaching the first pipe 11, the second pipe 12, the first connecting pipe 13, and the second connecting pipe 14 compared to the case where a plate-shaped pipe fixing member is used. Moreover, it is possible to reduce the weight and cost compared to the case where a plate-shaped pipe fixing member is used.

In the linear piping fixing member 20, the mounting base 19 is directly attached to the mounting boss 91 of the casing 2, but since the whole is linear, compared to the case where a plate-shaped piping fixing member is used, The surface area cooled by contact with the outside air is large per unit weight. Therefore, heat conduction from the mounting boss 91 side to the first pipe 11, the second pipe 12, the first connecting pipe 13, and the second connecting pipe 14 can be suppressed. Therefore, even if the linear piping fixing member 20 is provided, the differential pressure sensor 40 is difficult to receive heat conduction from the casing 2 via the linear piping fixing member 20, and the differential pressure sensor 40 detects the differential pressure. You can improve the accuracy of values. Further, as shown in FIG. 5, even if the cooling air CL from the cooling fan (not shown) of the diesel engine 100 hits the linear piping fixing member 20, instead of using a plate-shaped piping fixing member, a linear piping fixing member with a small wire diameter is used. Since the piping fixing member 20 is used, wind noise can be reduced.

Moreover, as shown in FIG. 5, since the first clamp parts 21 and 22 have an Ω shape, the first pipe 11 can be easily fitted and held from the outside. Furthermore, since the first clamp portions 21 and 22 have an Ω shape, they have bent portions 21R and 22R, respectively. The first clamp portions 21 and 22 are in mechanical and thermal contact along substantially the outer periphery of the straight portion 11D of the first pipe 11 over substantially the entire outer periphery of the straight portion 11D of the first pipe 11. are doing.
As a result, when the bent portions 21R and 22R of the first clamp portions 21 and 22 shown in FIG. The portions 21R and 22R function as a cooling section that can cool the first pipe 11 at multiple locations. Therefore, the bent portions 21R and 22R can cool the first pipe 11 at a plurality of locations, improving the heat dissipation of the first pipe 11, and promoting cooling of the first pipe 11. In particular, since the exhaust gas temperature passing through the first pipe 11 is high, the bent portions 21R and 22R of the first clamp parts 21 and 22 are effective in cooling and protecting the first pipe 11.

The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the scope of the claims. A part of the configuration of the above embodiment may be omitted or may be arbitrarily combined in a manner different from that described above.
For example, in the illustrated example, the object to which the mounting base 19 of the linear pipe fixing member 20 is fixed to the casing 2 is the mounting boss 91 of the exhaust gas temperature detection sensor 90 attached to the outer peripheral surface of the casing 2. However, it is not limited to this, and may be other parts of the casing 2, and is not particularly limited.

The linear pipe fixing member 20 is, for example, a piano wire with a circular cross section, but a pipe fixing member with a rectangular or elliptical cross section can also be used, and the cross section is not limited to a circular cross section. In the illustrated example, the pipe connected to the differential pressure sensor 40 is taken as an example of the pipe fixed by the linear pipe fixing member 20, but the linear pipe fixing member 20 is not limited to this. It can be used to fix piping arranged around the casing 2.

1: Exhaust treatment device, 2: Casing, 3: DPF, 4: DOC, 5, 6: Heat insulating material, 7: Exhaust gas introduction section, 8: Exhaust gas discharge section, 9: Bracket, 9A: Bolt, 10: Band , 11: First piping, 11A: One end, 11B: Other end, 11C: Curved portion, 11D: Straight portion, 12: Second piping, 12A: One end, 12B: Other end, 12C, 12D: Straight line Part, 13: First connecting pipe, 13A: One end, 13B: Other end, 14: Second connecting pipe, 14A: One end, 14B: Other end, 19: Mounting base, 20: Piping fixing member, 21 : first clamp part, 21R: bent part, 22: first clamp part, 22R: bent part, 23: first clamp part, 24: second clamp part, 40: differential pressure sensor, 90: exhaust gas temperature detection sensor , 91: Installation boss, 100: Diesel engine, 101: Casing fixing part, 200: Control part, CL: Cooling air, G: Exhaust gas

Claims (7)

An exhaust treatment device for a diesel engine, comprising a casing housing a diesel particulate filter, and piping provided around the casing,
a linear pipe fixing member for positioning and fixing the pipe with respect to the casing ;
A differential pressure sensor that detects a differential pressure between an upstream side and a downstream side of the diesel particulate filter in order to predict the amount of particulate matter accumulated by the diesel particulate filter;
Equipped with
The piping is
a first pipe connecting the upstream side of the diesel particulate filter and the differential pressure sensor;
a second pipe connecting the downstream side of the diesel particulate filter and the differential pressure sensor;
has
The piping fixing member is
a mounting base disposed along the outer circumferential surface of the casing and spaced apart from the outer circumferential surface of the casing, and fixed to the casing;
a first clamp portion that fixes the first pipe at a plurality of locations;
a second clamp portion that positions and fixes the second pipe;
has
The first clamp part has a cooling part that is provided at a position to receive cooling air from a cooling fan of the diesel engine, and cools the first pipe at a plurality of locations when the cooling air is received. exhaust treatment equipment. The diesel engine exhaust treatment device according to claim 1, wherein the position receiving the cooling air is a position facing the flow of the cooling air. The exhaust treatment device for a diesel engine according to claim 1 or 2 , wherein the cooling section is an Ω-shaped bent portion that is tightly attached to the outer periphery of the first pipe. The differential pressure sensor is connected to the first pipe by a first flexible non-metallic connecting pipe, and connected to the second pipe by a flexible second non-metallic connecting pipe. The diesel engine exhaust treatment device according to any one of claims 1 to 3, characterized in that: The first clamp part positions the connection part between the first pipe and the first connection pipe, and the second clamp part positions the connection part between the second pipe and the second connection pipe. The diesel engine exhaust treatment device according to claim 4, characterized in that: The diesel engine exhaust treatment device according to claim 1 , wherein the pipe fixing member is a piano wire. A diesel engine having an exhaust treatment device for a diesel engine including a casing housing a diesel particulate filter and piping provided around the casing,
The diesel engine exhaust treatment device includes:
a linear pipe fixing member for positioning and fixing the pipe with respect to the casing ;
A differential pressure sensor that detects a differential pressure between an upstream side and a downstream side of the diesel particulate filter in order to predict the amount of particulate matter accumulated by the diesel particulate filter;
Equipped with
The piping is
a first pipe connecting the upstream side of the diesel particulate filter and the differential pressure sensor;
a second pipe connecting the downstream side of the diesel particulate filter and the differential pressure sensor;
has
The piping fixing member is
a mounting base disposed along the outer circumferential surface of the casing and spaced apart from the outer circumferential surface of the casing, and fixed to the casing;
a first clamp portion that fixes the first pipe at a plurality of locations;
a second clamp portion that positions and fixes the second pipe;
has
The first clamp part has a cooling part that is provided at a position to receive cooling air from a cooling fan of the diesel engine, and cools the first pipe at a plurality of locations when the cooling air is received. .

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