JP2020133484A - Heat control apparatus - Google Patents

Abstract

To reduce the number of components for suppressing heat damage in a heat control apparatus.SOLUTION: A heat control apparatus 4 includes: an exhaust pipe 41 through which exhaust gas generated from an engine 3 of a vehicle passes; an aftertreatment device 42 provided in the exhaust pipe 41 and purifying exhaust gas; and a heat shielding part 43 provided between an external object receiving heat from the aftertreatment device 42 and the aftertreatment device 42 and reducing the transmission amount of heat emitted by the aftertreatment device 42 to the external object. The heat shielding part 43 includes an opening part 431 that is provided downstream of the exhaust pipe 41 and through which exhaust gas flowing out from the exhaust pipe 41 and air outside the exhaust pipe 41 pass.SELECTED DRAWING: Figure 2

Description

The present invention relates to a vehicle thermal control device.

Conventionally, a vehicle provided with a heat protector that blocks heat generated from an aftertreatment device for purifying exhaust gas generated from an engine is known (see, for example, Patent Document 1). Further, there is also known a vehicle provided with an exhaust cooler that cools the exhaust gas generated from the engine and then discharges the exhaust gas (see, for example, Patent Document 2).

Jikkenhei 5-19518 Gazette Japanese Unexamined Patent Publication No. 2001-32711

When a heat protector is installed to suppress heat damage caused by heat generated from the aftertreatment device and an exhaust cooler is installed to suppress heat damage caused by exhaust gas, the number of parts and assembly man-hours of the equipment to suppress heat damage There was a problem that the number increased.

Therefore, the present invention has been made in view of these points, and an object of the present invention is to provide a thermal control device capable of reducing the number of parts for suppressing heat damage.

In the first aspect of the present invention, an exhaust pipe for passing exhaust gas generated from a vehicle engine, an aftertreatment device provided in the exhaust pipe for purifying the exhaust gas, and heat reception from the aftertreatment device. The heat shield is provided between an external object and the aftertreatment device, and has a heat shield that reduces the amount of heat generated by the aftertreatment device that is transferred to the external object. Provided is a thermal control device provided downstream of the exhaust pipe and having an opening for passing the exhaust gas flowing out from the exhaust pipe and the air outside the exhaust pipe.

Further, the heat shield may further have a tubular portion having an inner diameter larger than the outer diameter of the exhaust pipe provided at the edge of the opening.

Further, an inflow portion provided downstream of the exhaust pipe and inflowing the exhaust gas flowing out from the exhaust pipe and air outside the exhaust pipe, and the exhaust gas flowing in from the inflow portion and the inflow. It further has an exhaust cooler having an exhaust gas having an outflow portion in which a mixed gas mixed with air flowing in from the portion flows out, and the opening is provided downstream of the outflow portion and flows out from the outflow portion. The mixed gas may be passed through.

Further, the opening may be provided at a position where air is drawn in between the aftertreatment device and the heat shield as air outside the exhaust pipe.

According to the present invention, there is an effect that the number of parts for suppressing heat damage can be reduced in the heat control device.

The state in which the thermal control device according to the first embodiment is provided in the vehicle is shown. The structure of the thermal control device which concerns on 1st Embodiment is shown. The structure of the thermal control device according to the second embodiment is shown. The structure of the thermal control device which concerns on 3rd Embodiment is shown.

<First Embodiment>
[Peripheral configuration of thermal control device 4]
FIG. 1 is a diagram showing a state in which the thermal control device 4 according to the first embodiment is provided in the vehicle.
The vehicle has a cab 1, a bodywork 2, an engine 3, and a thermal control device 4.

The cab 1 is a box-shaped portion with a driver's seat and is provided in front of the vehicle. The bodywork unit 2 is an accommodating unit for accommodating luggage and the like. The bodywork portion 2 is provided behind the cab 1. The engine 3 generates power for driving the vehicle. The engine 3 is, for example, a gasoline engine or a diesel engine. The engine 3 generates power and exhaust gas by supplying and burning fuel (for example, gasoline or light oil) and air. The engine 3 is provided below the cab 1.

The heat control device 4 is a device that makes it difficult for heat damage caused by heat generated from the aftertreatment device 42, which will be described later, and heat damage caused by exhaust gas discharged from the exhaust pipe 41 to occur.

[Structure of thermal control device 4]
The heat control device 4 has an exhaust pipe 41, an aftertreatment device 42, and a heat shield unit 43. The exhaust pipe 41 passes the exhaust gas generated from the engine 3. One end of the exhaust pipe 41 in the longitudinal direction is connected to the engine 3, and the other end of the exhaust pipe 41 in the longitudinal direction is located near the opening 431 of the heat shield portion 43 described later. The exhaust pipe 41 has an inflow portion 411 and an outflow portion 412. The inflow portion 411 is an opening through which the exhaust gas generated from the engine 3 flows in. The outflow portion 412 is an opening through which the exhaust gas flowing in from the inflow portion 411 is discharged. The outflow portion 412 is provided toward the outside of the vehicle. Specifically, the outflow portion 412 is provided toward the outside in the vehicle width direction of the vehicle.

The aftertreatment device 42 is provided in the exhaust pipe 41 and purifies the exhaust gas. The aftertreatment device 42 includes, for example, an oxidation catalyst filter or a NOx selective reduction catalyst. The aftertreatment device 42 becomes hot due to the passage of high-temperature exhaust gas, and generates heat to the surroundings.

The heat shield 43 is provided between the external object that receives heat from the post-treatment device 42 and the post-treatment device 42, and reduces the amount of heat generated by the post-treatment device 42 transferred to the external object. The heat shield 43 is provided on the outside of the vehicle with respect to the aftertreatment device 42. Specifically, the heat shield 43 is provided on the outside of the aftertreatment device 42 in the vehicle width direction. The heat shield 43 has, for example, a plate-shaped region extending in the front-rear direction of the vehicle and the height direction of the vehicle. The heat shield 43 may have a heat insulating member.

The heat shield 43 has an opening 431. The opening 431 is provided downstream of the exhaust pipe 41, and allows the exhaust gas flowing out of the exhaust pipe 41 and the air outside the exhaust pipe 41 to pass therethrough. Specifically, the opening 431 is located outside the outflow portion 412 of the exhaust pipe 41 in the vehicle width direction. An air inflow portion for allowing air outside the exhaust pipe 41 to flow into the opening 431 is formed between the end of the exhaust pipe 41 on the outflow portion 412 side and the edge of the opening 431 of the heat shield portion 43. There is.

The exhaust gas flowing out of the exhaust pipe 41 flows through the opening 431. Specifically, the exhaust gas flowing out from the exhaust pipe 41 flows through the opening 431 from the inside to the outside in the vehicle width direction of the vehicle. The air outside the exhaust pipe 41 is drawn toward the opening 431 by the exhaust gas flowing through the opening 431, and flows through the opening 431 in the same manner as the flow of the exhaust gas.

As described above, the heat control device 4 has the exhaust gas and the air by having the heat shield portion 43 in which the opening 431 through which the exhaust gas flowing out from the exhaust pipe 41 and the air outside the exhaust pipe 41 are passed is formed. The exhaust gas can be cooled as a mixed gas mixed with and through the opening 431.

The opening 431 is provided at a position where air is drawn in between the aftertreatment device 42 and the heat shield 43 as the air outside the exhaust pipe 41. The heat control device 4 has a heat shield 43 having an opening 431 formed at such a position, so that the post treatment device between the post treatment device 42 and the heat shield 43 is heated by the heat shield 43. Air can flow out of the opening 431.

The heat control device 4 causes the air heated by the post-treatment device 42 between the post-treatment device 42 and the heat shield 43 to flow out from the opening 431 in this way, thereby causing the post-treatment device 42 and the heat shield 43 to flow out. The temperature of the air between and can be lowered. As a result, the heat control device 4 transfers the amount of heat transferred from the post-treatment device 42 to the outside of the heat shield 43 via the air between the post-treatment device 42 and the heat shield 43 and the heat shield 43. It can be further reduced.

[Modification example]
In the above embodiment, the heat shield 43 has a plate-shaped region, and the opening 431 is formed in the plate-shaped region, but the present invention is not limited to this. For example, the heat shield portion 43 may have a tubular portion having an inner diameter larger than the outer diameter of the exhaust pipe 41 provided at the edge of the opening 431.

Further, in the above embodiment, the outflow portion 412 of the exhaust pipe 41 is provided toward the outside in the vehicle width direction of the vehicle, and the heat shield portion 43 is provided outside the aftertreatment device 42 in the vehicle width direction. The opening 431 shows a structure of the outflow portion 412 of the exhaust pipe 41 located outside in the vehicle width direction of the vehicle, but is not limited thereto. The outflow portion 412 of the exhaust pipe 41 is provided toward the rear in the front-rear direction of the vehicle, and the heat shield portion 43 is provided, for example, at the rear of the aftertreatment device 42 in the front-rear direction of the vehicle. Reference numeral 431 may have a structure in which the outflow portion 412 of the exhaust pipe 41 is located rearward in the front-rear direction of the vehicle.

<Second embodiment>
FIG. 3 is a diagram showing the structure of the thermal control device 4a according to the second embodiment.
The heat control device 4a according to the second embodiment is different from the heat control device 4 according to the first embodiment in that it has an exhaust cooler 44a.

The heat control device 4a includes an exhaust pipe 41, an aftertreatment device 42, a heat shield unit 43, and an exhaust cooler 44a. The exhaust cooler 44a cools the exhaust gas generated from the engine 3 and then discharges the exhaust gas. The exhaust cooler 44a has an inflow portion 441a and an outflow portion 442a.

The inflow portion 441a is provided downstream of the exhaust pipe 41, and allows the exhaust gas that has flowed out from the outflow portion 412 of the exhaust pipe 41 and the air outside the exhaust pipe 41 to flow in. Specifically, the inflow portion 441a is an opening formed on the exhaust pipe 41 side of the exhaust cooler 44a. Since the diameter of the inflow portion 441a of the exhaust cooler 44a is larger than the outer diameter of the end portion of the exhaust pipe 41 on the exhaust pipe 41 side, the inner surface of the end portion of the exhaust cooler 44a on the exhaust pipe 41 side and the exhaust pipe 41 An air inflow portion is formed between the exhaust cooler 44a and the outer surface of the end portion on the side of the exhaust cooler 44a. The air outside the exhaust pipe 41 flowing in from the inflow portion 441a flows into the exhaust cooler 44a from the air inflow portion.

The outflow section 442a discharges a mixed gas in which the exhaust gas flowing in from the inflow section 441a and the air flowing in from the inflow section 441a are mixed. The exhaust gas flowing in from the inflow portion 441a is mixed with the air outside the exhaust pipe 41 flowing in from the inflow portion 441a inside the exhaust cooler 44a. Therefore, the temperature of the mixed gas flowing out from the outflow portion 442a is lower than the temperature of the exhaust gas flowing out from the inflow portion 441a.

The opening 431 of the heat shield 43 is provided downstream of the outflow portion 442a of the exhaust cooler 44a, and allows the mixed gas that has flowed out from the outflow portion 442a to pass through. Specifically, the opening 431 of the heat shield 43 is provided on the outside of the outflow portion 442a of the exhaust cooler 44a in the vehicle width direction. The opening 431 of the heat shield 43 may allow the mixed gas flowing out from the outflow portion 442a and the air outside the exhaust pipe 41 to pass through.

The heat control device 4a according to the second embodiment can further cool the exhaust gas flowing out from the exhaust pipe 41 by having the heat control device 4a having the exhaust cooler 44a in this way. Therefore, the heat control device 4a can further reduce the heat damage caused by the exhaust gas flowing out from the exhaust pipe 41.

<Third embodiment>
FIG. 4 is a diagram showing the structure of the thermal control device 4b according to the third embodiment.
The heat control device 4b according to the third embodiment is different from the heat control device 4 according to the first embodiment in that it has a heat shield portion 43b and an exhaust cooler 44b.

The heat control device 4b includes an exhaust pipe 41, an aftertreatment device 42, a heat shield unit 43b, and an exhaust cooler 44b. The heat shield portion 43b has a heat shield portion main body 431b and a pipe portion 433b. Like the heat shield 43, the heat shield main body 431b has, for example, a plate-shaped region extending in the front-rear direction of the vehicle and the height direction of the vehicle. The heat shield main body 431b has an opening 432b like the heat shield 43.

The pipe portion 433b is provided on the edge of the opening 432b on the surface of the heat shield main body 431b on the side of the post-processing device 42. The pipe portion 433b has, for example, a cylindrical shape and extends in the vehicle width direction of the vehicle. The pipe portion 433b has an inflow portion 434b and an outflow portion 435b.

The inflow portion 434b is provided on the inflow portion 434b side in the longitudinal direction of the pipe portion 433b with respect to the outflow portion 442b of the exhaust cooler 44b, and the exhaust gas flowing out from the outflow portion 442b of the exhaust cooler 44b and the exhaust cooler 44b. Inflow the outside air. Specifically, the inflow portion 434b is an opening formed on the exhaust cooler 44b side of the pipe portion 433b.

Since the diameter of the inflow portion 434b of the pipe portion 433b is larger than the outer diameter of the end portion of the exhaust cooler 44b on the pipe portion 433b side, the inner surface of the end portion of the pipe portion 433b on the exhaust cooler 44b side and the exhaust cooler 44b An air inflow portion is formed between the pipe portion and the outer surface of the end portion on the 433b side. The air outside the exhaust cooler 44b flowing in from the inflow portion 434b flows into the pipe portion 433b from the air inflow portion.

The outflow section 435b discharges a mixed gas in which the exhaust gas flowing in from the inflow section 434b and the air flowing in from the inflow section 434b are mixed. Specifically, the outflow portion 435b is an opening formed on the side opposite to the exhaust cooler 44b side in the longitudinal direction of the pipe portion 433b. The outflow portion 435b communicates with the opening 432b. The exhaust gas flowing in from the inflow portion 434b is mixed with the air inside the pipe portion 433b and outside the exhaust cooler 44b flowing in from the inflow portion 434b. Therefore, the temperature of the mixed gas flowing out from the opening 432b is lower than the temperature of the exhaust gas flowing out from the inflowing portion 434b.

The exhaust cooler 44b, like the exhaust cooler 44a, cools the exhaust gas generated from the engine 3 and then discharges the exhaust gas. The exhaust cooler 44b has an inflow portion 441b and an outflow portion 442b.

The inflow portion 441b is provided on the inflow portion 411 side in the longitudinal direction of the exhaust pipe 41 with respect to the outflow portion 412 of the exhaust pipe 41, and the exhaust gas flowing out from the outflow portion 412 of the exhaust pipe 41 and the exhaust pipe 41. Inflow the outside air. Specifically, the inflow portion 441b is an opening formed on the exhaust pipe 41 side of the exhaust cooler 44b.

Since the diameter of the inflow portion 441b of the exhaust cooler 44b is larger than the outer diameter of the end portion of the exhaust pipe 41 on the exhaust pipe 41 side, the inner surface of the end portion of the exhaust cooler 44b on the exhaust pipe 41 side and the exhaust pipe 41 An air inflow portion is formed between the exhaust cooler 44b and the outer surface of the end portion on the side of the exhaust cooler 44b. The air outside the exhaust pipe 41 flowing in from the inflow portion 441b flows into the exhaust cooler 44b from the air inflow portion.

The outflow portion 442b is provided on the outflow portion 435b side in the longitudinal direction of the pipe portion 433b with respect to the inflow portion 434b of the pipe portion 433b of the heat shield portion 43b. The outflow section 442b discharges a mixed gas in which the exhaust gas flowing in from the inflow section 441b and the air flowing in from the inflow section 441b are mixed. The exhaust gas flowing in from the inflow portion 441b is mixed with the air outside the exhaust pipe 41 flowing in from the inflow portion 441b inside the exhaust cooler 44b. Therefore, the temperature of the mixed gas flowing out from the outflow portion 442b is lower than the temperature of the exhaust gas flowing out from the inflow portion 441b.

In the thermal control device 4b, as described above, the inflow portion 441b is provided on the inflow portion 411 side in the longitudinal direction of the exhaust pipe 41 with respect to the outflow portion 412 of the exhaust pipe 41. That is, the end of the exhaust pipe 41 on the outflow portion 412 side is located inside the exhaust cooler 44b. Further, in the heat control device 4b, as described above, the outflow portion 442b is provided on the outflow portion 435b side in the longitudinal direction of the pipe portion 433b with respect to the inflow portion 434b of the pipe portion 433b of the heat shield portion 43b. That is, the end of the exhaust cooler 44b on the outflow portion 442b side is located inside the pipe portion 433b of the heat shield portion 43b.

In the thermal control equipment 4b, a predetermined region in the longitudinal direction of the exhaust pipe 41 from the end of the exhaust pipe 41 on the outflow portion 412 side is inserted inside the exhaust cooler 44b. Further, in the heat control device 4b, a predetermined region in the longitudinal direction of the exhaust cooler 44b from the end portion of the exhaust cooler 44b on the outflow portion 442b side is inserted inside the pipe portion 433b of the heat shield portion 43b. There is.

[Effect of Thermal Control Device 4 According to This Embodiment]
The heat control device 4 according to the present embodiment is provided in the exhaust pipe 41 through which the exhaust gas generated from the engine 3 of the vehicle passes, and the post-treatment device 42 for purifying the exhaust gas, and the post-treatment device 42. It is provided between an external object that receives heat from the external object and the aftertreatment device 42, and has a heat shield portion 43 that reduces the amount of heat generated by the aftertreatment device 42 transferred to the external object. The heat shield 43 is provided downstream of the exhaust pipe 41, and has an opening 431 that allows the exhaust gas flowing out of the exhaust pipe 41 and the air outside the exhaust pipe 41 to pass through.

The heat control device 4 according to the present embodiment is thus provided between the external object that receives heat from the aftertreatment device 42 and the posttreatment device 42, and the heat generated by the posttreatment device 42 is an external object. It has a heat shield 43 that reduces the amount transmitted to. The heat shield 43 is provided downstream of the exhaust pipe 41, and has an opening 431 that allows the exhaust gas flowing out of the exhaust pipe 41 and the air outside the exhaust pipe 41 to pass through. Therefore, the heat control device 4 can block the heat generated from the aftertreatment device 42 and cool the exhaust gas flowing out from the exhaust pipe 41. As a result, in the heat control device 4, it becomes difficult to increase the number of parts of the device for suppressing the heat damage caused by the heat generated from the aftertreatment device 42 and the heat damage caused by the exhaust gas, and the man-hours for assembling.

Although the present invention has been described above using the embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments, and various modifications and changes can be made within the scope of the gist. is there. For example, the specific embodiment of the distribution / integration of the device is not limited to the above embodiment, and all or a part thereof may be functionally or physically distributed / integrated in any unit. Can be done. Also included in the embodiments of the present invention are new embodiments resulting from any combination of the plurality of embodiments. The effect of the new embodiment produced by the combination has the effect of the original embodiment together.

1 ... Cab 2 ... Mounting part 3 ... Engines 4, 4a, 4b ... Thermal control device 41 ... Exhaust pipe 411 ... Inflow part 412 ... Outflow part 42 ... Post-treatment devices 43, 43b ... Heat shield 431 ... Opening 431b ... Heat shield main body 432b ... Opening 433b ... Pipe 434b ... Inflow 435b ... Outflow 44a, 44b ... Exhaust coolers 441a, 441b ... Inflow section 442a, 442b ... Outflow section

Claims (4)

An exhaust pipe that allows exhaust gas generated from the vehicle engine to pass through,
An aftertreatment device provided in the exhaust pipe to purify the exhaust gas,
A heat shield that is provided between an external object that receives heat from the post-treatment device and the post-treatment device and that reduces the amount of heat generated by the post-treatment device that is transferred to the external object.
Have,
The heat shield is a heat control device provided downstream of the exhaust pipe and having an opening through which the exhaust gas flowing out from the exhaust pipe and the air outside the exhaust pipe pass. The heat shield further includes a tubular portion having an inner diameter larger than the outer diameter of the exhaust pipe provided at the edge of the opening.
The thermal control device according to claim 1. An inflow portion that is provided downstream of the exhaust pipe and allows exhaust gas that has flowed out of the exhaust pipe and air outside the exhaust pipe to flow in, and an exhaust gas that has flowed in from the inflow portion and the inflow portion. Further having an exhaust cooler having an outflow portion for outflowing a mixed gas mixed with the inflowed air,
The opening is provided downstream of the outflow portion and is characterized by passing the mixed gas flowing out from the outflow portion.
The thermal control device according to claim 1 or 2. The opening is provided at a position where air is drawn in between the aftertreatment device and the heat shield as air outside the exhaust pipe.
The thermal control device according to any one of claims 1 to 3.

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