JP2002317631A - Engine emission gas exhausting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an engine emission gas exhausting device capable of improving appearance of an exterior by dispensing with an exhaust pipe protruding from an armor body, cleaning emission gas of a diesel engine, and miniaturizing air conditioning equipment with the usage of the heat of the exhaust gas, or miniaturizing a generator and a battery with the usage of the heat of the emission gas. SOLUTION: This engine emission gas exhausting device discharges the emission gas of the engine to the outside of the armor body of a construction machine accommodating the engine. An exhaust port is provided on an exterior surface of the armor body in order to receive and discharge the emission gas of the engine through the exhaust pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas exhaust system for an engine, and more particularly to an exhaust system for a diesel engine used in a hydraulic excavator.

[0002]

2. Description of the Related Art In a conventional general excavator, FIG.
As shown in the side sectional view of FIG. 4, a diesel engine 92 (hereinafter, referred to as engine 92) is disposed inside an engine room 91. The engine 92 drives a fan 93, and draws in cooling air in the outside air from an intake port 94 provided on the front side (left side in the figure) of the engine 92 and on the left side surface 91a of the engine room 91 in the figure. The sucked cooling air is supplied to a radiator 9 disposed in front of the fan 93.
5, an engine 92 and a hydraulic pump 9 disposed rearward
6, or the muffler 97 or the like is cooled. The cooled and warmed air is provided on the rear side (right side in the figure) of the engine 92.
And an outlet 9 provided on the upper surface 91b of the engine room 91
8a and a discharge port 98b provided in the right side surface 91c in the figure, the air is discharged to the outside air. A muffler 97 is disposed above the engine 92. After muffler 97 silences exhaust gas from the engine 92, the engine room 91
From the outside through an exhaust pipe 99 connected to a muffler 97.

[0003] In recent years, hydraulic excavators have become the mainstream for small-sized hydraulic excavators, and are also becoming mainstream for medium-sized models. An ultra-small swing hydraulic excavator
The upper revolving structure including the engine room 91 is formed small so as to be within the lateral width of the lower traveling structure, so that driving is easy, and a one-sided lane can be used in road construction and the like, so that even a medium-sized model is frequently used. It has become. However, along with this, the engine room 91 and the driver's cab of the upper revolving superstructure are reduced in size and the internal volume is reduced, and are formed in a circular shape in plan view.

[0004]

In the above construction, since hydraulic excavators are often used in urban areas, the appearance and the appearance of the passenger car are further improved, and the exhaust gas is more cleanly cleaned. Requested. Also, in some small ultra-small-turn hydraulic excavators, exhaust gas may be discharged below the vehicle body. There is a problem in that the gas is applied to a driver who is seated above and is driving, or a trench moat or the like hits a worker in the trench, and the working environment is deteriorated. In addition, since the volume of the engine room and the cab of the ultra-small-turn hydraulic excavator is reduced, a filter must be installed in the engine room to dissipate the heat generated by the engine and clean the exhaust gas. Is required. Furthermore, since the driver's cab is miniaturized, the room temperature fluctuates greatly due to the season and the weather, for example, direct sunlight, etc., and there is a need for air conditioning equipment that is effective in cooling and heating. In addition, the driving device uses GPS to prevent theft, grasps the usage status of hydraulic excavators,
In addition, since electronic devices are used for maintenance and the like in accordance with the use situation, it is required to install equipment having a large electric capacity.

The present invention has been made in view of the above problems, and eliminates the exhaust pipe protruding from the exterior body, improves the appearance of the appearance, cleans the exhaust gas of the diesel engine, and reduces the heat of the exhaust gas. It is an object of the present invention to provide an engine exhaust gas exhaust device in which the size of an air conditioner is reduced by using it, or the size of a generator and a storage battery is reduced by using heat of exhaust gas.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, an engine exhaust gas emission device according to the present invention is provided with an exterior body for housing an engine of a construction machine or for housing an engine. An exterior body and an exterior body that is provided adjacent to the exterior body and does not house the engine,
In the engine exhaust gas exhaust device for discharging the exhaust gas of the engine to the outside of the exterior body, an exhaust port for receiving the exhaust gas of the engine via an exhaust pipe and discharging the exhaust gas to the outside is provided on the exterior surface of the exterior body. . In this case, the exhaust port has an exhaust gas passage area larger than the cross-sectional area of the exhaust pipe inner diameter. Further, it is preferable that the discharge port is constituted by a discharge box and a discharge plate, and either the discharge box or the discharge plate is attached to the exterior body with a heat insulating material interposed therebetween. Further, it is preferable that the discharge port is provided in any one of a side surface portion, an upper surface portion, a lower surface portion, and a slope portion of the outer surface of the exterior body. Further, it is preferable that a hole is provided inside the exterior body of the discharge box, a gas in the exterior body passing through the hole and exhaust gas are mixed, and the mixture is discharged to the outside air from the discharge port. Further, it is preferable that the outlet has a guide member for regulating a discharge direction of the exhaust gas. Preferably, the guide member is freely openable and closable. Further, it is preferable that an exhaust ejector device is provided in the exhaust pipe or the discharge box, and a gas flowing to the exhaust ejector device is a gas in an exterior body or outside air. Further, it is preferable to provide a diesel particulate filter at one of the discharge port and the exhaust passage leading to the discharge port. In addition, it is preferable that the exhaust port or the exterior body can be freely opened and closed so that the diesel particulate filter can be inspected or replaced. Further, it is preferable that a discharge fan driven by a drive source is provided in the vicinity of the exterior body, and the air blown by the discharge fan is received and the exhaust gas is discharged from the discharge port to the outside air. An engine exhaust gas exhaust device of the present invention is an engine exhaust gas exhaust device for exhausting engine exhaust gas to the outside of an exterior body of a construction machine containing an engine, the engine exhaust gas exhaust device being disposed on an outer peripheral portion of the exhaust pipe or exhaust box. And a storage battery that receives electricity generated by the thermoelectric generator by exhaust gas heat. Further, the engine exhaust gas exhaust device of the present invention is an engine exhaust gas exhaust device that discharges engine exhaust gas to the outside of a construction machine housing an engine. The air conditioner is provided with a cooling and heating device including a disposed primary heat exchanger and a secondary heat exchanger that receives the refrigerant of the primary heat exchanger heated by the exhaust gas heat and heats or cools the operation room. Further, it is preferable that exhaust gas used for the thermoelectric generator or the air conditioner is discharged to the outside air from an outlet connected to an exhaust pipe.

According to the above configuration, the exhaust gas of the engine can be discharged to the outside at a low wind speed through the exhaust pipe having a large area provided on the external surface of the exterior body through the exhaust pipe. Since this outlet is attached to the exterior body with the heat insulating material interposed therebetween, the exterior body is not heated. Also,
The discharge port can be provided on any of the side surface, the upper surface, or the slope portion of the external surface of the exterior body, thereby improving the appearance of the external appearance and increasing the degree of freedom of the installation location at the time of design. I have. The exhaust gas is mixed with the gas in the exterior body that has passed through the hole provided in the discharge box and becomes low in temperature, and when exhausted to the outside air from the exhaust port, the gas in the exterior body is sucked and discharged by the exhaust gas. Therefore, outflow of air from the exterior body can be increased. Further, the exhaust gas can be discharged in a safe direction by regulating the discharge direction by the guide member. The guide member is openable and closable, and can close the outlet. The exhaust ejector device can discharge exhaust gas at a low temperature by flowing gas in the exterior body or outside air. Further, the exhaust gas is filtered as black smoke and particulates by a diesel particulate filter, and is discharged as clean exhaust gas. This diesel particulate filter can be inspected or replaced with a simple operation by opening and closing the discharge port or the exterior body. The exhaust gas generates electric power by a thermoelectric generator using the waste heat, and can drive the mounted electronic device by the electricity. In addition, the exhaust gas raises the temperature of the refrigerant in the primary heat exchanger by using the waste heat, and the refrigerant can be used to cool and heat the cab with the secondary heat exchanger disposed in the cab.

As a result, the appearance can be improved by eliminating the exhaust pipe. Since the attachment location of the discharge port can be selected in a wide range depending on the size of the vehicle, the attachment location suitable for the vehicle is selected, the appearance can be improved, and the design becomes easy. Since the exhaust gas sucks the gas in the outer casing through the hole provided in the discharge box and discharges the exhaust gas to the outside air, the temperature of the exhaust gas becomes lower and the outflow of the air in the outer casing increases, and the temperature in the outer casing decreases. be able to. Since the discharge port is attached to the exterior body with the heat insulating material interposed therebetween, the exterior body is not heated, and safety is maintained even when an operator comes in contact with the exhaust port. In addition, the exhaust gas can be discharged in a safe direction by the guide member, and by closing the guide member, intrusion of water such as rain can be prevented. Further, since the exhaust ejector discharges the exhaust gas at a low temperature and a low wind speed by the gas in the exterior body or the outside air, safety can be ensured even if the exhaust gas is discharged in any direction. Further, the exhaust gas is cleaned by removing black smoke and particulates by a filter, thereby addressing environmental issues. This diesel particulate filter can be easily inspected or replaced from the outside, and easy maintenance is achieved. The mounted electronic devices are driven by electricity generated by waste heat of exhaust gas,
Even if the use of the amount of electricity increases, the capacity of the storage battery or the generator can be reduced. The cab air conditioning uses the waste heat of the exhaust gas to perform cooling and heating in the secondary heat exchanger in the cab, so that the secondary heat exchanger can be downsized, and at the same time as a micro-swing hydraulic excavator. Even if the driver's cab is downsized, comfortable air conditioning can be obtained by strong air conditioning.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an engine exhaust gas discharge device according to the present invention will be described below with reference to the drawings. In the following, the same components as those of the related art or other embodiments are denoted by the same reference numerals, and description thereof will be omitted. First, an engine exhaust gas discharge device 1 according to a first embodiment will be described with reference to FIGS.
This will be described with reference to FIGS. FIG. 1 is a perspective view of a hydraulic excavator 2 which is a kind of construction machine, and FIG.
3A is a side sectional view, and FIG. 3 is a side view showing a part of the engine exhaust gas exhaust device 1.

In FIG. 1, a hydraulic excavator 2 has a lower traveling body 3, an upper revolving body 4 pivotally mounted on the lower traveling body 3, and a base end attached to the upper revolving body 4. And a work machine 5 which can be raised and lowered freely. Hydraulic excavator 2
The cab 6 is mounted on the front left side of the upper revolving unit 4, and the exterior body 7 for housing the engine 92 is mounted on the rear part of the upper revolving unit 4.

An engine 92 is mounted in the exterior body 7 substantially horizontally, and a radiator 95 is mounted in front of the engine 92. Engine 92 and radiator 95
A fan 93, which is driven by the engine and sucks outside air from the suction port 84, is mounted in between.
An air cleaner 8 and a pre-cleaner 9 are provided in front of the radiator 95, and supply the sucked air to the engine 92. A hydraulic pump 96 driven by an engine 92 is mounted behind the engine 1, and the working machine 5 is operated by the generated hydraulic pressure.

As shown in FIG. 2, an engine exhaust gas discharge device 1 for the engine 92 is disposed above the engine 92. In the engine exhaust gas exhaust device 1, a turbocharger 13 attached to an exhaust manifold 11 is disposed at a central upper portion of an engine 92, and exhaust gas of the engine 92 is discharged through an exhaust pipe 14 and a muffler 87 to an outside exhaust. Tube 14
And the outlet 15 attached to the exterior body 7
It discharges to the outside air more. This discharge port 15 is
Is arranged so as to be visible from the exterior surface 7 a of the engine 9, which may be inside or outside the exterior body 7.
A different room may be formed adjacent to the exterior body 7 surrounding the container 2, and the outlet 15 may be attached to this room. In the above description, the turbocharger 13 is installed in the exhaust device 1 of the engine 92.
However, without being limited to this, any of a mechanical supercharger or a natural intake may be used.

As shown in FIG. 3, the discharge port 15 is integrally formed by a discharge box 17 and a discharge plate 19. The discharge plate 19 has a plurality of holes 21 for discharging exhaust gas to the outside air. The hole 21 has a passage area in which the total passage area of the hole 21 is larger than the inner diameter cross-sectional area of the exhaust pipe 14 and is regulated so that the exhaust gas does not hit an adjacent worker, An outlet 15 is configured. The discharge box 17 has a passage area inside the discharge box 17.
4 has a larger passage area than the inner diameter cross-sectional area. The outlet 15 is attached to the exterior body 7 via a heat insulating material 23. Thereby, even if the outlet 15 is heated by the exhaust gas, the rise in the temperature of the exterior body 7 can be suppressed to be small. In the above description, a plurality of holes are formed in the discharge plate 19 to discharge the exhaust gas to the outside air. However, a porous material may be inserted into the discharge box 17 to discharge the exhaust gas.

Next, the operation of the above configuration will be described. When the engine 92 starts, the engine 92 is charged by the pre-cleaner 9 and the air cleaner 8 with the turbo charge 13.
After the air supplied through is mixed with fuel, it explodes due to compression and rotates. The combustion gas that has rotated the engine 92 becomes high-temperature exhaust gas and is discharged to the exhaust pipe 14 via the turbocharge 13. After the exhaust gas discharged to the exhaust pipe 14 is silenced by the muffler 87, the exhaust gas is set to a low wind speed at the exhaust port 15 having a larger passage area than the exhaust pipe 14 connected to the exhaust pipe 14, and a plurality of holes of the exhaust plate 19 are formed. The air is discharged to the outside along the direction of the hole formed from 21. This allows
Since the exhaust gas is discharged at a lower speed than the outer surface of the wide exterior body 7, the concentration of the discharged gas is reduced, and
Low noise and emissions.

Next, a first engine exhaust gas discharge device 1A according to a second embodiment will be described with reference to FIG. FIG.
FIG. 3 is a partial side sectional view of a first exhaust port 15A which is the first engine exhaust gas exhaust device 1A. In FIG. 4, the first
The discharge port 15A is provided with a first discharge box 17A and a first discharge plate 19A.
It is divided into two parts. This first discharge plate 19A
Is openably and closably attached to the first discharge box 17A by a hinge 25 as shown by a two-dot chain line. Also, the first discharge plate 1
A lock 27 is mounted between the first discharge box 17A and the first discharge box 17A. When the lock is closed, the handle 29 attached to the first discharge plate 19A is pushed, and the first discharge plate 19A is moved by the lock 27. Engage with the first discharge box 17A. Further, by pulling the handle 29, the first discharge plate 19A is released from the locking member 27, and the first discharge plate 19A is opened.

The operation of the second embodiment is the same as that of the first embodiment except that the first discharge port 15A can be freely opened and closed, so that the detailed description is omitted.

A description will be given of a second engine exhaust gas discharge device 1B according to a third embodiment. Since the second engine exhaust gas discharge device 1B is shown together with the first exhaust port 15A of the first exhaust device 1A shown in FIG. 4, the second engine exhaust gas discharge device 1B shown in FIG.
A description will be given using a partial side sectional view of the first discharge port 15A of the embodiment. In FIG. 4, the second discharge port 15B is provided with a first hole 31 inside the exterior body 7 of the first discharge box 17A and on the side and / or top surface. Other than this, it may be the same integral type as the outlet 15 of the first embodiment, or may be the same as the split type of the first outlet 15A of the second embodiment.

Next, the operation of the second discharge port 15B will be described. Exhaust gas discharged from the engine 92 to the exhaust pipe 14 is muffled by the muffler 87, and then flows to the first discharge box 17A connected to the exhaust pipe 14 as indicated by an arrow Ya. First discharge plate 19 of discharge port 15A
It is discharged from A to outside air. At this time, the exhaust gas sucks the air in the exterior body 7 so as to flow into the first discharge box 17A through the first hole 31 of the first discharge box 17A (indicated by an arrow Yb). Thereby, the air in the exterior body 7 flows into the first discharge box 17A, mixes with the air in the exterior body 7 in the first discharge box 17A, lowers the exhaust gas temperature, and is wider than the exhaust pipe 14. In the first discharge box 17A having a passage area, the wind speed is made low together with the exhaust gas, and the plurality of holes 2 of the discharge plate 19 are formed.
The air is discharged to the outside air along the direction of the hole drilled from 1.
As a result, the exhaust gas has a lower temperature and the exhaust pipe 1
Since the liquid is discharged from the first discharge port 15A provided on the external surface of the exterior body 7 having a passage area larger than 4, the degree of safety is further increased.

A third engine exhaust gas discharge device 1C according to a fourth embodiment will be described with reference to FIG. FIG.
Third exhaust port 15C which is an engine exhaust gas exhaust device 1C
3 is a partial side sectional view of FIG. In FIG. 5, the third outlet 1
In 5C, the second discharge plate 19B is attached to the first discharge box 17A so as to be freely opened and closed. The second discharge plate 19B is configured by a guide member 32 that regulates the discharge direction of the exhaust gas. The guide member 32 includes a plurality of swingable guide plates 33.
And a support plate 35 disposed at both ends of the guide plate 33, attached to the second discharge plate 19B, and supporting the guide plate 33 in a swingable manner. A steel wire 37 for swinging the plate 33 and the steel wire 37 are connected and stopped at the swinging position of the guide plate 33, and slide to swing the guide plate 33, and the guide plate 33 is moved at a predetermined position. It is constituted by a stopper 39 with a lever to be locked. The guide member 32 may be mounted as a separate member on the discharge plate 19 of the discharge port 15 of the first embodiment, or may be mounted on the first discharge plate 19A of the second embodiment. Further, the guide member 32 is swingable by the steel wire 37, but may be connected to the rack by a gear or by a bar.

Next, the operation of the third discharge port 15C will be described. When discharging the exhaust gas, the third discharge port 15C operates the stopper 39 with a lever, swings the steel wire 37 to pull down, for example, to open the guide plate 33, and operates the exhaust gas to pass therethrough. . As a result, the guide plate 33 opens, and the exhaust gas is discharged. At this time, the opening direction and the opening angle of the guide plate 33 can be adjusted,
The discharge direction of the exhaust gas can be regulated and discharged to the outside air. When the third exhaust port 15C does not discharge exhaust gas, the stopper 39 with lever is operated to swing the steel wire 37 so as to pull up the steel wire 37 and close the guide plate 33, for example. This can prevent the entry of water such as rain by closing the guide member 32.

A fourth engine exhaust gas discharge device 1D according to a fifth embodiment will be described with reference to FIGS. FIG. 6 shows a fourth exhaust port 1 which is a fourth engine exhaust gas exhaust device 1D.
5D is a partial side sectional view, and FIG. 7 is a front view in a sectional view taken along line BB of FIG. In FIG. 6, an exhaust ejector device 41 is provided inside the discharge box 17 at the fourth discharge port 15D.
The exhaust ejector device 41 is disposed orthogonal to the discharge box 17 and has a hollow box 43 whose outer periphery is fixed in the discharge box 17.
While passing the exhaust gas through the hollow box 43,
And a pipe 47 having a second hole 45 formed therein. Further, the discharge box 17 is formed such that a third hole 49 is formed in a place where the hollow box 43 is fixed, so that air in the exterior body 7 flows into the hollow box 43 (indicated by an arrow Yc). I have. Alternatively, a pipe 51 may be provided as shown by a dotted line to introduce outside air from outside the exterior body 7.

Next, the operation of the fourth discharge port 15D will be described. At the fourth outlet 15D, the exhaust gas is
After flowing through the pipe 47, the plurality of holes 21 of the discharge plate 19 are
The air is discharged to the outside along the direction of the hole drilled. At this time, when the exhaust gas flows through the pipe 47, the hollow box 4
The air in the exterior body 7 flowing through the inside 3 flows into the pipe 47 from the second hole 45 (shown by an arrow Yd). At this time, the air in the exterior body 7 flowing in the hollow box 43 is sucked by the exhaust gas flowing in the pipe 47 and mixed with the exhaust gas. You. Thereby, the same effect as described above can be obtained.
In the above description, the exhaust ejector device 41 is provided in the discharge box 17, but as shown by a two-dot chain line, a part of the exhaust pipe 14 is made to have a small inner diameter, and a hole is made in that place,
A first pipe 53 may be provided. Further, as another embodiment, as shown in FIG.
5 is fixed to the side plate of the discharge box 17, and the exhaust pipe 14 is inserted into the suction pipe 55 and is arranged so as to have a predetermined clearance Sa. Thus, when the exhaust gas flows from the exhaust pipe 14 into the suction pipe 55, the exhaust gas sucks the air in the exterior body 7 from the gap Sa, mixes with the exhaust gas, and passes through the discharge box 17 through the discharge plate 17. It is discharged to outside air from 19. Thereby, a similar effect can be obtained as the exhaust ejector device 41.

A fifth engine exhaust gas discharge device 1E according to a sixth embodiment will be described with reference to FIG. In FIG. 9, the fifth engine exhaust gas discharge device 1E includes an exhaust pipe 14
Of the diesel particulate filter 57
(Hereinafter, referred to as DPF 57). DPF
57 is connected to the fifth discharge port 15E of the fifth engine exhaust gas discharge device 1E.

Next, a fifth engine exhaust gas exhaust device 1E
The operation of will be described. In the fifth engine exhaust gas discharge device 1E, black smoke and particulates contained in the exhaust gas are removed and discharged to the outside air. This DPF5
By opening the first discharge plate 19A of the fifth discharge port 15E, the filter 7a can inspect and replace the filter 57a housed inside the DPF 57 from outside. Also,
As another method, the case 57b of the DPF 57 is made freely openable and closable, and a part 7b (shown by a two-dot chain line) of the exterior body 7 in the vicinity where the DPF 57 is arranged is made freely openable and closable. 57b and part 7 of the exterior body 7
By opening b, the filter 57a housed inside the DPF 57 can be inspected and replaced from the outside.

A sixth engine exhaust gas discharge device 1F according to a seventh embodiment will be described with reference to FIG. In FIG. 10, the sixth engine exhaust gas discharge device 1F includes an exhaust pipe 1
A thermoelectric generator 61 is arranged on the outer periphery in the middle of 4. The exhaust pipe 14 from the thermoelectric generator 61 is connected to one of the outlets 15 described above, and the exhaust gas is discharged from the outlet 15 to the outside air after heating the thermoelectric generator 61. The thermoelectric generator 61 generates electric power by using a thermoelectric element (Peltier element). In the thermoelectric generator 61, a heat-side electrode 61a for receiving heat of exhaust gas is provided on the outer periphery of the exhaust pipe 14, and a P-type semiconductor 61b and an N-type semiconductor 61c are separated from and parallel to the heat-side electrode 61a. To join. The P-type semiconductor 61b is provided with a plus electrode 61d, and the N-type semiconductor 6
The negative electrode 61e is joined to 1c, and the generated electricity is transmitted to the storage battery positive electrode 65a and the storage battery negative electrode 65b of the storage battery 65 via the wiring 63.

Next, the sixth engine exhaust gas discharge device 1F
The operation of will be described. In the sixth engine exhaust gas discharge device 1F, the hot side electrode 61 disposed on the outer periphery of the exhaust pipe 14
The heat of the exhaust gas is received at a, and the heat is transmitted to the plus electrode 61d and the minus electrode 61e via the P-type semiconductor 61b and the N-type semiconductor 61c. The positive electrode 61d and the negative electrode 61e are cooled by the air flowing inside the exterior body 7, generate a temperature difference between the positive electrode 61d and the hot-side electrode 61a, and generate electricity.
The power is transmitted to the storage battery 65 through the storage device 65 and stored in the storage battery 65. Accordingly, the thermoelectric generator 61 can lower the temperature of the exhaust gas flowing in the exhaust pipe 14 and drive the mounted electronic equipment with the generated electricity, thereby increasing the use of electricity. Also, the capacity of the storage battery 65 or the dynamo (generator) can be reduced.

A seventh engine exhaust gas discharge device 1G according to the eighth embodiment will be described with reference to FIG. In FIG. 11, a seventh engine exhaust gas discharge device 1G includes an exhaust pipe 1
A primary heat exchanger 69 of a cooling and heating device 67 is disposed on the outer periphery in the middle of 4. In the cooling / heating device 67, the cooling / heating refrigerant is heated by the heat of the exhaust gas in the primary heat exchanger 69, sent to the secondary heat exchanger 71 disposed inside the cab 9, Air conditioning and heating. The refrigerant is Freon, carbon dioxide, methyl chloride, or the like.
The primary heat exchanger 69 is connected to the compressor 73, and the warmed refrigerant circulates through the cooling / heating device 67. Compressor 73
Are connected to a 3 port 2 position switching valve 75. An expansion valve 79 is provided on one pipe 77a that has exited the switching valve 75, and the expansion valve 79 is connected to a secondary heat exchanger 71 provided in the cab 9. The other pipe 77 b exiting the switching valve 75 joins between the expansion valve 79 and the secondary heat exchanger 71, and is connected to the secondary heat exchanger 7 provided in the cab 9.
1 connected. The expansion valve 79 and the expansion valve 79 are connected to a controller 81 such as a controller. Control unit 8
1 includes an operation button 81 that supports cooling, heating, or neutral.
a is attached.

Next, the seventh engine exhaust gas discharge device 1G
The operation of will be described. In the seventh engine exhaust gas discharge device 1G, the refrigerant is vaporized by receiving the heat of the exhaust gas in the primary heat exchanger 69 disposed on the outer periphery of the exhaust pipe 14, and
The temperature of the exhaust gas flowing inside the exhaust pipe 14 is reduced. During heating, the operation button 81a selects heating. Control unit 8
1 outputs an instruction to start to the compressor 73. Compressor 7
3 switches the refrigerant vaporized in the primary heat exchanger 69 to the switching valve 75
And the switching valve 75 is connected to the cab 9 through the other pipe 77b.
It flows to the secondary heat exchanger 71 disposed in the inside. In the secondary heat exchanger 71, the warmed and vaporized refrigerant receives the cold air in the room, is cooled and liquefied, and heats the room air. The refrigerant liquefied in the secondary heat exchanger 71 returns to the primary heat exchanger 69, is vaporized by receiving waste heat again, and repeats the process of lowering the temperature of the exhaust gas, thereby heating the operation cab 9.

At the time of cooling, cooling is selected by the operation button 81a. The control unit 81 outputs an instruction to start the compressor 73. The compressor 73 further increases the pressure of the refrigerant vaporized in the primary heat exchanger 69 and sends the refrigerant to the switching valve 75. The switching valve 75 sends the refrigerant compressed to a high pressure by the compressor 79 from one pipe 77 a to the expansion valve 81. The expansion valve 81 performs a reversible adiabatic expansion of the vaporized refrigerant to reduce the pressure, and supplies the refrigerant to the secondary heat exchanger 71 at a very low temperature. At this time,
The pressure is a positive pressure, preferably about 1 Pa to 3 Pa
It is desirable that the pressure is such that the liquefied refrigerant is circulated within the range of The secondary heat exchanger 71 receives warm air in the cab 9 and rises in temperature to be liquefied. The refrigerant liquefied in the secondary heat exchanger 71 returns to the primary heat exchanger 69, is vaporized by receiving waste heat again, and repeats a process of lowering the temperature of the exhaust gas to cool the operation cab 9. Thus, in the seventh engine exhaust gas discharge device 1G, since the cooling and heating of the cab is performed by the heat exchanger using the waste heat of the exhaust gas, the heat exchanger in the cab can be downsized, Even if the driver's cab is miniaturized like a swing type hydraulic excavator, strong cooling and heating can be obtained.

An eighth engine exhaust gas discharge device 1H according to a ninth embodiment will be described with reference to FIG. In FIG. 12, the eighth engine exhaust gas discharge device 1H includes an exterior body 7
Is provided with a discharge fan 85 driven by a drive source 83 such as an electric motor or a hydraulic motor, and an eighth discharge port 15 </ b> H is disposed between the discharge fan 85 and the exterior body 7. The eighth outlet 15H arranges a plurality of outlets branched from the exhaust pipe 14 in parallel at a predetermined interval, and sucks the exhaust gas in the eighth outlet 15H with air in the exterior body 7 flowing therebetween. Alternatively, the air may be discharged to the outside along the directions of the holes formed from the plurality of holes 21 of the discharge plate 19. As another method, the eighth outlet 15 </ b> H is provided with a fifth hole 87 on the discharge fan 85 side. The air in the exterior body 7 discharged by the discharge fan 85 passes through the fifth hole 87, pressurizes the exhaust gas in the eighth discharge port 15 </ b> H, and directs the holes formed from the plurality of holes 21 of the discharge plate 19. It may be made to discharge to outside air along. This makes it possible to lower the temperature and exhaust gas more strongly as described above.

Next, the eighth engine exhaust gas exhaust system 1H
The operation of will be described. In the eighth engine exhaust gas discharge device 1H, the exhaust fan 85 is rotated so that the exhaust gas can be sucked from the outlet 15H and discharged to the outside air. Thus, similarly to the above, it is possible to lower the temperature in the exterior body 7 at which the flow of air in the exterior body 7 increases, and to discharge the exhaust gas to the outside at a low temperature. Further, when the DPF 57 is mounted, cleaner exhaust gas can be discharged to the outside air.

The ninth engine exhaust gas discharge device 1J of the tenth embodiment will be described with reference to FIG. In the above-described tenth to tenth embodiments, the case where the exhaust port 15 is provided on the side surface of the exterior body 7 is shown. However, in FIG. 7c shows an example in which it is mounted. In this case, the ninth
Any of the exhaust ports 15 described in the first to ninth embodiments can be used as the engine exhaust gas exhaust device 1J. The description of the operation of the embodiment is omitted.

In the above example, the outlet 15 is mounted on the side surface 7a and the upper surface 7c of the exterior body 7, but may be provided on an inclined surface. The shape of the outlet 15 as viewed from the front can be rectangular, rectangular, polygonal, circular, oval, or any shape. Also, from the side, not only the flat surface but also the shape of the exterior body 7 is adjusted. The shape can be an arbitrary shape such as a sphere or an ellipse.

Further, in the above, each embodiment has been described separately, but the embodiments can be used in combination. For example, a combination of the DPF 57 and the thermoelectric generator 61 or the cooling / heating device 67 or a combination of the thermoelectric generator 61 and the cooling / heating device 67 can be performed. Further, in the above description, for example, as shown in FIG.
It is not necessary to provide a discharge hole only for air in the exterior body 7 as in the conventional example, and exhaust gas and air in the exterior body 7 can be exhausted from one exhaust port in a narrow range. Come. In the above-described embodiment, the description has been made using the construction machine. However, this may be an industrial machine such as a forklift, or may be an engine-type generator and an engine-type compressor with an exterior body.

[Brief description of the drawings]

FIG. 1 is a perspective view of a hydraulic excavator according to the present invention.

FIG. 2 is a side view of the exterior body and the engine exhaust gas exhaust device according to the first embodiment of the present invention, and is a side sectional view taken along line AA of FIG.

FIG. 3 is a partial side sectional view of a discharge port of the first embodiment.

FIG. 4 is a partial side cross-sectional view of a first or second exhaust port which is an engine exhaust gas exhaust device according to a second embodiment or a third embodiment.

FIG. 5 is a partial side sectional view of a third exhaust port which is a third engine exhaust gas exhaust device of a fourth embodiment.

FIG. 6 is a partial side cross-sectional view of a fourth exhaust port that is a fourth engine exhaust gas exhaust device of a fifth embodiment.

FIG. 7 is a front view of the fifth embodiment, and is a cross-sectional view taken along the line BB of FIG. 6;

FIG. 8 is a partial cross-sectional view of another embodiment that is a fourth engine exhaust gas exhaust device.

FIG. 9 is a side view of a fifth engine exhaust gas discharge device according to a sixth embodiment of the present invention.

FIG. 10 is a side view of a sixth engine exhaust gas discharge device according to a seventh embodiment of the present invention.

FIG. 11 is a side view of a seventh engine exhaust gas discharge device according to an eighth embodiment of the present invention.

FIG. 12 is a side view of an eighth engine exhaust gas discharge device according to a ninth embodiment of the present invention.

FIG. 13 is a side view of a ninth engine exhaust gas discharge device according to a tenth embodiment of the present invention.

FIG. 14 is a side view of a conventional engine room and an engine exhaust gas exhaust device.

[Explanation of symbols]

1: engine exhaust gas exhaust device, 2: hydraulic excavator, 6
... cab, 7 ... exterior body, 7a ... exterior surface, 14 ... exhaust pipe,
15 discharge outlet, 17 discharge box, 19 discharge plate, 21 ...
Holes, 31: First hole, 32: Guide member, 33: Guide plate, 41: Exhaust ejector device, 43: Hollow box, 47:
Pipe, 57 ... Diesel particulate filter,
57a: filter, 61: thermoelectric generator, 65: storage battery,
67 ... air conditioner, 69 ... primary heat exchanger, 71 ... secondary heat exchanger, 73 ... compressor, 75 ... switching valve, 79 ... expansion valve,
81: control unit, 83: drive source, 85: discharge fan, 92
…diesel engine.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme court ゛ (Reference) F01N 7/14 F01N 7/14 F01P 5/06 511 F01P 5/06 511B (72) Inventor Tsuneo Tanozaki Tochigi 400 Yokokura Nitta, Koyama City, Koyama Plant, Koyama Plant (72) Inventor Fumihide Sato 400 Yokokura Nitta, Koyama City, Tochigi Prefecture, Komatsu Plant, Koyama Plant F term (reference) 3D038 BA03 BA17 BB09 BC02 BC10 BC14 BC15 BC20 3G004 AA06 DA01 DA22 DA24 EA01 EA06 3G091 AA05 AB13 BA36

Claims (14)

[Claims] An exterior body containing an engine of a construction machine, or an exterior body containing an engine and an exterior body provided adjacent to the exterior body and not containing an engine, In the engine exhaust gas exhaust device for exhausting the engine exhaust gas to the outside of the exterior body, an exhaust port for receiving the engine exhaust gas via an exhaust pipe and discharging the exhaust gas to the outside is provided on an exterior surface of the exterior body. And engine exhaust gas exhaust device. 2. The engine exhaust gas exhaust device according to claim 1, wherein the exhaust port has a passage area for exhaust gas larger than a cross-sectional area of an exhaust pipe inner diameter. 3. The discharge port comprises a discharge box and a discharge plate, and one of the discharge box and the discharge plate is attached to an exterior body with a heat insulating material interposed therebetween. 3. The engine exhaust gas discharge device according to 2. 4. The engine exhaust according to claim 1, wherein the exhaust port is provided at any one of a side surface, an upper surface, and a slope of an exterior surface of the exterior body. Gas exhaust device. 5. The exhaust box according to claim 1, wherein a hole is provided inside the exterior body of the discharge box, a gas in the exterior body passing through the hole and exhaust gas are mixed, and the mixture is discharged from the discharge port to the outside air.
5. The exhaust gas discharge device for an engine according to any one of the items 4 to 5. 6. The exhaust port according to claim 1, wherein the exhaust port has a guide member for regulating a discharge direction of the exhaust gas.
5. The exhaust gas discharge device for an engine according to any one of the above items 5. 7. The engine exhaust gas discharge device according to claim 6, wherein the guide member is openable and closable. 8. An exhaust ejector device is provided in the exhaust pipe or the exhaust box, and a gas flowing to the exhaust ejector device is a gas in an exterior body or outside air.
7. The engine exhaust gas discharge device according to any one of 6. 9. The engine exhaust gas emission according to claim 1, wherein a diesel particulate filter is provided at one of the exhaust port and an exhaust passage leading to the exhaust port. apparatus. 10. The engine exhaust gas emission device according to claim 9, wherein an exhaust port or an exterior body is openable and closable so that the diesel particulate filter can be inspected or replaced. 11. A discharge fan driven by a drive source is provided in the vicinity of the exterior body, and receives air blown by the discharge fan and discharges the exhaust gas together with exhaust gas to the outside air. An engine exhaust gas discharge device according to any one of the above. 12. An engine exhaust gas discharge device for discharging exhaust gas of an engine to the outside of an exterior body of a construction machine containing an engine, wherein the thermoelectric generator is disposed on an outer peripheral portion of the exhaust pipe or the discharge box. And an accumulator that receives electricity generated by the thermoelectric generator by heat of the exhaust gas. 13. An engine exhaust gas discharge device for discharging exhaust gas of an engine to the outside of an exterior body of a construction machine containing an engine, wherein a primary heat exchange disposed on an outer peripheral portion of the exhaust pipe or the discharge box. An exhaust gas discharge device for an engine, comprising: a cooling and heating device including a heat exchanger and a secondary heat exchanger for heating or cooling the inside of an operation room by receiving a refrigerant of a primary heat exchanger heated by exhaust gas heat. 14. The engine exhaust gas discharge according to claim 1, wherein the exhaust gas used in the thermoelectric generator or the air conditioner is discharged to the outside air from a discharge port connected to an exhaust pipe. apparatus.