JP2022098109A - Exhaust treatment device for diesel engine, and the diesel engine - Google Patents

Abstract

To provide an exhaust treatment device for a diesel engine and the diesel engine capable of actualizing reliable and easy positioning pf a pipe with respect to a casing by improving the assemblability of the pipe arranged around the casing having a diesel particulate matters trapping filter.SOLUTION: An exhaust treatment device 1 for a diesel engine 100 includes a casing 2 storing a DPF 3 as the diesel particulate matter trapping filter, and a heat-resistance plate-like pipe fixing member 20 having a first pipe 11 and a second pipe 12 as metal pipes provided around the casing 2 for positioning and fixing the first pipe 11 and the second pipe 12 with respect to the casing 2.SELECTED DRAWING: Figure 3

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, also referred to as a DPF muffler, has a DPF (diesel particulate filter: diesel particulate filter), a DOC (diesel oxidation catalyst) and the like. The DPF collects PM (abbreviation for particulate matter). DOC oxidizes HC (hydrocarbons) and CO (carbon monoxide). The DOC raises the temperature of the exhaust gas and burns the PM in the DPF. The exhaust treatment device measures the pressure using a differential pressure sensor in order to predict the accumulated amount of PM captured 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 the PM in the exhaust gas by 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 accumulated amount reaches a predetermined regeneration required amount, the exhaust treatment apparatus regenerates the DPF by raising the exhaust temperature and burning and removing the PM deposited on the DPF.

In the exhaust treatment device, a steel pipe is attached to the boss of the DPF assembly, and the differential pressure sensor is arranged around the DPF. The body part of the differential pressure sensor is made of resin. Inside the exhaust gas treatment device, SUS material is used as the material of the exhaust gas treatment device because the temperature is high and the pressure is high. The seal structure is a metal touch. Further, a stay that suppresses the runout of the steel pipe may be installed so that the steel pipe does not resonate and be damaged by the vibration of the exhaust treatment device. Patent Document 1 discloses an exhaust treatment device including a differential pressure sensor.

In the exhaust treatment apparatus described in Patent Document 1, when assembling a steel pipe in a manufacturing process, the position of the steel pipe cannot be determined without a stay, so that the assembling work of the steel pipe is difficult. That is, since the fixed structure of the steel pipe becomes a fixed structure in one place by the mounting screw portion of the steel pipe, the rotation direction of the steel pipe cannot be regulated. If an additional stay is used to regulate the rotation 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.

The differential pressure sensor is connected to the upstream side and the downstream side of the DPF via a differential pressure pipe. The differential pressure pipe has at least a part of a flexible rubber tube and is arranged in the vicinity of the DPF which is a high temperature heat source. Therefore, the differential pressure sensor and the rubber tube of the differential pressure pipe are easily affected by heat damage from the DPF. Especially in a small diesel engine, the installation space of the exhaust treatment device is limited. Therefore, there is a problem that the rubber tube of the differential pressure sensor and the differential pressure pipe is close to the DPF, which is a high-temperature heat source, and is more susceptible to heat damage from the DPF.

Japanese Unexamined Patent Publication No. 2014-58896

The present invention has been made to solve the above problems, improve the assembling property of the pipes arranged around the casing having the diesel fine particle collection filter, and ensure the positioning of the pipes with respect to the casing. It is an object of the present invention to provide a diesel engine exhaust treatment device and a diesel engine that can be easily performed.

The subject is an exhaust treatment device for a diesel engine having a casing accommodating a diesel fine particle collection filter and a metal pipe provided around the casing, wherein the pipe is attached to the casing. The problem is solved by the exhaust gas treatment device for a diesel engine according to the present invention, which comprises a plate-shaped pipe fixing member having heat resistance for positioning and fixing.

Since the exhaust treatment device of the diesel engine of the present invention includes a plate-shaped pipe fixing member having heat resistance for positioning and fixing the pipe with respect to the casing, it is arranged around the casing having the diesel fine particle collection filter. It is possible to improve the assemblability of the pipes to be made and to reliably and easily position the pipes with respect to the casing. The pipe can be securely fixed to the casing, and the vibration resistance of the pipe can be improved.

The diesel engine exhaust treatment device of the present invention preferably has a difference between the upstream side and the downstream side of the diesel fine particle collection filter in order to predict the accumulated amount of particulate matter captured by the diesel fine particle collection filter. A differential pressure sensor for detecting pressure is further provided, and the pipes include a first pipe connecting the upstream side of the diesel fine particle collection filter and the differential pressure sensor, and the downstream side of the diesel fine particle collection filter. It is characterized by having a second pipe for connecting to the differential pressure sensor.
The exhaust treatment device of the diesel engine of the present invention improves the assembling property of the first pipe and the second pipe connected to the differential pressure sensor, and ensures the positioning of the first pipe and the second pipe with respect to the casing. It can be done easily.

In the diesel engine exhaust treatment device of the present invention, preferably, the pipe fixing member is arranged between the casing and the differential pressure sensor to block the transmission of radiant heat from the casing to the differential pressure sensor. It is characterized by having a heat shield member.
According to the exhaust treatment device of the diesel engine of the present invention, since the heat shield member is arranged between the casing and the differential pressure sensor, the heat shield member blocks the heat from the casing and is transmitted to the differential pressure sensor. It is possible to reduce or eliminate the influence of heat damage on the differential pressure sensor.

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 is made of a flexible non-metal. It is characterized in that it is connected to the second pipe by the second connecting pipe of the above.
According to the diesel engine exhaust treatment device of the present invention, the flexible non-metal first connecting pipe and the second connecting pipe attenuate the vibration transmitted from the first pipe and the second pipe, so that the first connection is made. The vibration resistance of the differential pressure sensor connected to the pipe and the second connecting pipe can be improved. Further, the heat shield member can block heat from the casing to reduce or eliminate the influence of heat damage on the first connecting pipe, the second connecting pipe and the differential pressure sensor.

The exhaust treatment device for a diesel engine of the present invention preferably further includes a strip-shaped member arranged around the casing, and the pipe fixing member includes a first fixing portion for fixing the heat shield member to the strip-shaped member. It is characterized by having a second fixing portion for fixing the position of the first pipe and a third fixing portion for fixing the position of the second pipe.
According to the exhaust gas treatment device of the diesel engine of the present invention, the pipe fixing member is formed by the second fixing portion and the third fixing portion in a state where the heat shield member is securely fixed to the strip-shaped member of the casing by the first fixing portion. The positions of the first pipe and the second pipe can be fixed. Therefore, it is possible to prevent the first pipe and the second pipe from vibrating and improve the vibration resistance of the first pipe and the second pipe.

In the exhaust treatment device of the diesel engine of the present invention, preferably, the first fixing portion fixes the heat shield member to the band-shaped member by sandwiching the edges on both sides of the band-shaped member, and the second fixing portion is fixed to the band-shaped member. The fixing portion fixes the peripheral surface of the first pipe, and the third fixing portion fixes the peripheral surface of the second pipe.
According to the exhaust gas treatment device of the diesel engine of the present invention, the first fixing portion can reliably fix the heat shield member to the strip-shaped member only by sandwiching the edges on both sides of the strip-shaped member. The positions of the first pipe and the second pipe can be fixed to the second fixing portion and the third fixing portion, respectively. Therefore, it is possible to prevent the first pipe and the second pipe from vibrating and improve the vibration resistance of the first pipe and the second pipe.

In the exhaust treatment device of the diesel engine of the present invention, preferably, in a state where the first fixing portion is fixed with the edges on both sides of the strip-shaped member sandwiched between the heat shield member and the strip-shaped member. , It is characterized in that a gap is provided.
According to the exhaust treatment device of the diesel engine of the present invention, since the gap is formed between the heat shield member and the band-shaped member, the heat of the casing is directly transferred to the heat shield member through the band-shaped member. do not do. Therefore, it is possible to prevent the heat shield member itself from becoming hot and to prevent the heat shield member from becoming hot. As a result, the heat shield member can increase the heat shield effect for shielding the differential pressure sensor.

The subject is a diesel engine including a diesel engine exhaust treatment device having a casing accommodating a diesel fine particle collection filter and a metal pipe provided around the casing. An engine exhaust treatment device is solved by a diesel engine according to the present invention, which comprises a plate-shaped pipe fixing member having heat resistance for positioning and fixing the pipe with respect to the casing.

According to the diesel engine of the present invention, since the exhaust treatment device includes a plate-shaped pipe fixing member having heat resistance for positioning and fixing the pipe with respect to the casing, the casing having the diesel fine particle collection filter is provided. It is possible to improve the assemblability of the pipes arranged around the casing so that the pipes can be positioned with respect to the casing reliably and easily. The pipe can be securely fixed to the casing, and the vibration resistance of the pipe can be improved.

According to the present invention, it is possible to improve the assemblability of the pipes arranged around the casing having the diesel fine particle collection filter, and to reliably and easily position the pipes with respect to the casing. Equipment and diesel engines can be provided.

It is sectional drawing which shows the exhaust gas treatment apparatus of the diesel engine which concerns on embodiment of this invention. It is a perspective view which shows the diesel engine which is equipped with the exhaust treatment apparatus of the diesel engine shown in FIG. It is a front view which shows the diesel engine which is equipped with the exhaust treatment apparatus of the diesel engine shown in FIG. It is a side view which shows the diesel engine which is equipped with the exhaust treatment apparatus of a diesel engine. It is a perspective view which shows the preferable structural example of a pipe fixing member.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
Since the embodiments described below are suitable specific examples of the present invention, various technically preferable limitations are attached, but the scope of the present invention is particularly limited to the present invention in the following description. Unless otherwise stated, the present invention is not limited to these aspects. Further, in each drawing, the same components are designated by the same reference numerals, and detailed description thereof will be omitted as appropriate.

(Configuration example of exhaust gas treatment device 1 of diesel engine)
FIG. 1 is a cross-sectional view showing an exhaust treatment device for a diesel engine according to an embodiment of the present invention.
The diesel engine exhaust treatment device 1 shown in FIG. 1 is mounted on, for example, an industrial diesel engine. The industrial diesel engine is mounted on, for example, a construction machine, an agricultural machine, a lawn mowing machine, or the like, but the type of the device on which the diesel engine 100 is mounted is not particularly limited.

The exhaust treatment device (hereinafter referred to as an exhaust treatment device) 1 of the diesel engine 100 is also called a DPF muffler, and has a heat-resistant metal cylindrical casing 2 and a DPF (diesel particulate filter: diesel particulate filter). It has a filter) 3, a DOC (diesel oxidation catalyst) 4, one and the other heat insulating materials 5, 6, an exhaust gas introduction unit 7, an exhaust gas exhaust unit 8, and the like. Casing 2 houses DPF3 and DOC4. As shown by the arrow, the exhaust gas G discharged from the diesel engine is introduced from the exhaust gas introduction unit 7 into the exhaust gas flow path in the casing 2, 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 DPF3, PM (abbreviation of particulate matter) in the exhaust gas G is collected by DPF3 and the PM is burned. After that, the exhaust gas G is sent from the exhaust gas discharge unit 8 to the exhaust system of the diesel engine 100.

(Diesel engine 100)
FIG. 2 is a perspective view showing a diesel engine 100 on which the exhaust gas 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 portion 101 of the diesel engine 100 by using a bracket 9 and a bolt 9A or 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 portion 101 of the diesel engine 100 shown in FIG. 2 by using a bracket 9, a bolt 9A, or the like.

(Piping fixing member 20, first pipe 11 and second pipe 12)
Next, the pipe fixing member 20, the first pipe 11, and the second pipe 12 will be described with reference to FIGS. 2 to 5.
FIG. 3 is a front view showing a diesel engine 100 on which the exhaust gas treatment device 1 shown in FIG. 2 is mounted.
FIG. 4 is a side view showing a diesel engine 100 on which the exhaust gas treatment device 1 is mounted.
FIG. 5 is a perspective view showing a preferable structural example of the 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 on the entire circumference of the casing 2. It is wrapped around and fixed. The band 10 is a heat-resistant metal plate material. The pipe fixing member 20 is fixed to the band 10 by using the band 10.

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 metal tubes having heat resistance. The first pipe 11 is longer than the second pipe 12. The first pipe 11 has a J-shaped curved portion 11C, a straight line portion 11D, and an arc portion 11E. The second pipe 12 has straight portions 12C and 12D, and is formed in 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 11A of the first pipe 11 is detachably connected to a position corresponding to 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-metal first connecting pipe 13. The other end 12B of the second pipe 12 is detachably connected to one end 14A of the flexible non-metal second connecting pipe 14. The first connecting pipe 13 and the second connecting pipe 14 are flexible non-metal tubes such as rubber pipes. 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 the 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 DPF3 in order to predict the accumulated amount of PM captured by the diesel fine particle collection filter DPF3. The differential pressure sensor 40 obtains the pressure on the upstream side of the DPF3 through the first pipe 11 and the first connecting pipe 13, and obtains the pressure on the downstream side of the DPF3 through the second pipe 12 and the second connecting pipe 14, thereby obtaining the pressure on the downstream side of the DPF3. Detects the differential pressure between the upstream side and the downstream side of. Then, the control unit 200 such as the engine ECU (electronic control unit) of the diesel engine 100 shown in FIG. 2 has PM in the DPF3 based on the differential pressure between the upstream side and the downstream side of the DPF3 detected by the differential pressure sensor 40. When the amount of PM deposited reaches a predetermined amount required for regeneration by estimating the amount of deposit, the exhaust temperature is raised and the PM deposited on DPF3 is burned and removed to regenerate DPF3.

(Explanation of detailed structural example of pipe fixing member 20)
Next, a structural example of the pipe fixing member 20 will be described in detail with reference to FIGS. 2 to 5.
FIG. 5 shows a structural example of the pipe fixing member 20, but the pipe fixing member 20 is a plate-shaped member made by, for example, press-molding a heat-resistant metal plate material such as an iron plate. The exhaust treatment device 1 is not deformed by the heat generated.

The pipe fixing member 20 is not only a positioning fixing role for positioning and fixing the first pipe 11 and the second pipe 12 with respect to the casing 2, but also a differential pressure sensor 40 and a flexible for example rubber pipe. The first connecting pipe 13 and the second connecting pipe 14 also serve as a heat shield for blocking high heat generated from the casing 2.

As shown in FIGS. 5 and 3, the pipe fixing member 20 has a first fixing portion 21, a second fixing portion 22, a third fixing portion 23, and a heat shield member 24. The heat shield member 24 is, for example, a substantially rectangular plate material, and is curved along the outer peripheral surface 10R of the band 10. A first fixing portion 21 is formed at one end of the heat shield member 24, and an extension portion 25 is formed at the other end of the heat shield member 24.
As shown in FIG. 5, the first fixing portion 21 has claw portions 21R and 21R that sandwich both edge portions 10F and 10F of the band 10. As a result, the heat shield member 24 is fixed so as to sandwich the band 10 between the claw portions 21R and 21R.

As shown in FIGS. 5 and 4, preferably, the inner surface of the heat shield member 24 and the surface of the band 10 are separated by a predetermined gap DS. Since the gap DS is formed between the inner surface of the heat shield member 24 and the surface of the band 10, the high heat of the casing 2 is not directly transferred to the heat shield member 24 through the metal band 10. As a result, the heat shield member 24 itself can be prevented from becoming hot as much as possible, and the heat shield member 24 can be suppressed from becoming hot. Therefore, the heat shield member 24 is first connected to the differential pressure sensor 40. It is possible to increase the heat shielding effect for shielding the heat between the pipe 13 and the second connecting pipe 14.

As shown in FIG. 5, the extension portion 25 is superposed on the fixing member 26, and the extension portion 25 and the fixing member 26 are fixed by two sets of bolts 27 and nuts 28. One end of the extension portion 25 and one end of the fixing member 26 constitute a second fixing portion 22, and the other end of the extension portion 25 and the other end of the fixing member 26 are third fixed. It constitutes a part 23. The second fixing portion 22 is formed by superimposing the substantially C-shaped portion 25G of the extension portion 25 and the substantially C-shaped portion 26G of the fixing member 26, and using the bolt 27 and the nut 28. 1 The peripheral surface of the straight portion 11D of the pipe 11 is sandwiched and fixed. Similarly, the third fixing portion 23 superimposes the substantially C-shaped portion 25H of the extension portion 25 and the substantially C-shaped portion 26H of the fixing member 26, and uses the bolt 27 and the nut 28. As a result, the peripheral surface of the straight portion 12D of the second pipe 12 is sandwiched and fixed.

In this way, the first pipe 11 and the second pipe 12 can be reliably and easily positioned and fixed to the casing 2 by using the pipe fixing member 20 only by using bolts and nuts. Since the pipe fixing member 20 is inexpensive and the positioning and fixing work of the first pipe 11 and the second pipe 12 is easy, the fixing workability of the first pipe 11 and the second pipe 12 at the time of assembling work is improved. Since the work of brazing the stay with silver is not required for positioning and fixing the first pipe 11 and the second pipe 12, the work efficiency can be improved and the cost can be reduced.

The second fixing portion 22 contacts and fixes the peripheral surface of the straight portion 11D of the first pipe 11 so as to sandwich the peripheral surface of the straight portion 12D of the second pipe 12. It is in contact and fixed. As a result, when the cooling air CL from a cooling fan (not shown) of the diesel engine 100 is received, the second fixed portion 22 and the third fixed portion 23 function as cooling portions capable of cooling the first pipe 11 and the second pipe 12. Therefore, the heat dissipation of the first pipe 11 and the second pipe 12 is improved, and the cooling of the first pipe 11 and the second pipe 12 can be promoted.

As described above, the plate-shaped pipe fixing member 20 plays a role of positioning and fixing the first pipe 11 and the second pipe 12 to the casing 2. Moreover, the pipe fixing member 20 can position and fix the first pipe 11 and the second pipe 12 in a narrow space between the casing 2 and the diesel engine 100. Moreover, the heat shield member 24 of the plate-shaped pipe fixing member 20 has a resin differential pressure sensor 40 and a flexible for example rubber pipe, for example, a casing of the first connection pipe 13 and the second connection pipe 14. It also serves as a heat shield that blocks the high-temperature radiant heat generated from 2. Due to the heat-shielding effect of the plate-shaped heat-shielding member 24, the resin differential pressure sensor 40, which is a peripheral component arranged around the casing 2, and the first connecting pipe 13, which is a flexible rubber tube, for example. And the influence of heat damage on the second connecting pipe 14 can be reduced or eliminated.

Further, by securing a large area of the plate-shaped heat shield member 24, the cooling air from the cooling fan (not shown) of the diesel engine 100 hits the heat shield member 24, so that the temperature of the heat shield member 24 itself is high. Can be lowered. Therefore, the heat shield member 24 applies the high heat generated from the casing 2 to the resin differential pressure sensor 40 and the flexible, for example, rubber tubes, the first connection tube 13 and the second connection tube 14. Increases the ability of heat shield to block. In particular, in the case of a small diesel engine, the casing 2 and the differential pressure sensor 40 and the first connecting pipe 13 and the second connecting pipe 14 are located closer to each other due to the limitation of the installation space. The plate-shaped pipe fixing member 20 having 24 can secure the heat shielding ability even in the case of a small diesel engine, and is particularly useful.

Since the plate-shaped 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. Further, the flexible first connecting pipe 13 and the second connecting pipe 14, coupled with the damping of the vibration transmitted from the first pipe 11 and the second pipe 12, the first connecting pipe 13 and the second connecting pipe It is possible to suppress the differential pressure sensor 40 connected to 14 from vibrating significantly due to the vibration of the diesel engine. Therefore, 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 plate-shaped pipe fixing member 20 is an assembly work in which the first pipe 11, the second pipe 12, the first connecting pipe 13, and the second connecting pipe 14 are assembled in a narrow space between the casing 2 and the diesel engine 100. Can improve sex. By improving the assemblability of the pipe connecting the diesel fine particle collection filter and the differential pressure sensor, it is possible to reliably and easily position the pipe with respect to the diesel fine particle collection filter.

The embodiment of the present invention has been described above. However, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of claims. The configuration of the above embodiment may be partially omitted or may be arbitrarily combined so as to be different from the above.
For example, in the illustrated example, the target to which the pipe fixing member 20 is fixed is the band 10 attached to the outer peripheral surface of the casing 2, but the exhaust gas discharge portion 8 or the like shown in FIG. 4 may be particularly used. Not limited.

As shown in FIG. 5, the extension portion 25 of the pipe fixing member 20 and the fixing member 26 are fixed by two sets of bolts 27 and nuts 28 to obtain a second fixing portion 22 and a third fixing portion 23. ing. However, without using the fixing member 26, for example, a C-shaped or Ω (ohm) -shaped second fixing portion 22 and a third fixing portion 23 having a spring property are formed at both ends of the extension portion 25. , The straight portion 11D of the first pipe 11 and the straight portion 12D of the second pipe 12 are fitted into the C-shaped second fixing portion 22 and the third fixing portion 23, respectively. As a result, the pipe fixing member 20 may fix the first pipe 11 and the second pipe 12, and the structure of the pipe fixing member 20 can be simplified and the number of parts can be reduced.

In the illustrated example, the pipe connected to the differential pressure sensor is given as an example of the pipe fixed by the plate-shaped pipe fixing member, but the pipe fixing member is arranged around the casing. It can be used for fixing various types of piping. The plate-shaped pipe fixing member having heat resistance is not limited to a metal material, and may be a non-metal material such as a ceramic plate.

1: Exhaust gas treatment device, 2: Casing, 3: DPF, 4: DOC, 5, 6: Insulation material, 7: Exhaust gas introduction part, 8: Exhaust gas exhaust part, 9: Bracket, 9A: Bolt, 10: Band , 10F: edge, 10R: outer peripheral surface, 11: first pipe, 11A: one end, 11B: other end, 11C: curved part, 11D: straight part, 11E: arc part, 12: second pipe, 12A : One end, 12B: The other end, 12C, 12D: Straight part, 13: First connection pipe, 13A: One end, 13B: The other end, 14: Second connection pipe, 14A: One end, 14B: Other End, 20: Pipe fixing member, 21: 1st fixing part, 21R: Claw part, 22: 2nd fixing part, 23: 3rd fixing part, 24: Heat shield member, 25: Extension part, 25G, 25H: Part, 26: Member, 26G, 26H: Part, 27: Bolt, 28: Nut, 40: Differential pressure sensor, 100: Diesel engine, 101: Casing fixing part, 200: Control part, CL: Cooling air, DS: Gap , G: Exhaust gas

Claims (8)

An exhaust treatment device for a diesel engine having a casing accommodating a diesel fine particle collection filter and a metal pipe provided around the casing.
An exhaust gas treatment device for a diesel engine, comprising a plate-shaped pipe fixing member having heat resistance for positioning and fixing the pipe to the casing. In order to predict the accumulated amount of particulate matter captured by the diesel fine particle collection filter, a differential pressure sensor for detecting the differential pressure between the upstream side and the downstream side of the diesel fine particle collection filter is further provided.
The piping is
A first pipe connecting the upstream side of the diesel particle collection filter and the differential pressure sensor, and
A second pipe connecting the downstream side of the diesel particle collection filter and the differential pressure sensor, and
The exhaust gas treatment device for a diesel engine according to claim 1, wherein the exhaust gas treatment device is characterized by having. The second aspect of claim 2, wherein the pipe fixing member has a heat shield member that is arranged between the casing and the differential pressure sensor and blocks heat from being transferred from the casing to the differential pressure sensor. Diesel engine exhaust treatment equipment. The differential pressure sensor is connected to the first pipe by a flexible non-metal first connecting pipe, and is connected to the second pipe by a flexible non-metal second connecting pipe. The diesel engine exhaust treatment device according to claim 3, wherein the engine is provided. Further provided with strip-shaped members arranged around the casing,
The pipe fixing member is
A first fixing portion for fixing the heat shield member to the band-shaped member,
A second fixing portion for fixing the position of the first pipe and
A third fixing portion for fixing the position of the second pipe and
4. The exhaust gas treatment device for a diesel engine according to claim 4. The first fixing portion fixes the heat shield member to the band-shaped member by sandwiching the edges on both sides of the band-shaped member, and the second fixing portion fixes the peripheral surface of the first pipe. The exhaust gas treatment device for a diesel engine according to claim 5, wherein the third fixing portion fixes a peripheral surface of the second pipe. The claim is characterized in that, in a state where the first fixing portion is fixed by sandwiching the edge portions on both sides of the band-shaped member, a gap is provided between the heat shield member and the band-shaped member. 6. The diesel engine exhaust treatment device according to 6. A diesel engine comprising a diesel engine exhaust treatment device comprising a casing accommodating a diesel fine particle collection filter and a metal pipe provided around the casing.
The exhaust treatment device of the diesel engine is
A diesel engine comprising a plate-shaped pipe fixing member having heat resistance for positioning and fixing the pipe to the casing.

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