JP6473301B2 - Engine-driven work machine - Google Patents

Engine-driven work machine Download PDF

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JP6473301B2
JP6473301B2 JP2014161148A JP2014161148A JP6473301B2 JP 6473301 B2 JP6473301 B2 JP 6473301B2 JP 2014161148 A JP2014161148 A JP 2014161148A JP 2014161148 A JP2014161148 A JP 2014161148A JP 6473301 B2 JP6473301 B2 JP 6473301B2
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engine
air
soundproof box
work machine
electronic component
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JP2016037894A (en
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賛 早川
賛 早川
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北越工業株式会社
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Description

  The present invention relates to an engine-driven work machine, and more particularly to an engine-driven work machine provided with an exhaust gas aftertreatment device in an exhaust path of an engine.

  In an engine-driven work machine in which a work machine such as a generator or a compressor and an engine that drives the work machine are housed in a soundproof box, gasoline is used as the engine that drives the work machine in order to reduce running costs. In comparison, it is common to use a diesel engine that uses cheap diesel oil as fuel.

  Due to its structure, this diesel engine generates particulate matter (particulate matter, hereinafter referred to as “PM”) that causes air pollution and health damage along with fuel combustion. An exhaust gas aftertreatment device called DPF (Diesel Particulate Filter) (hereinafter simply referred to as “DPF”) is installed inside, and the exhaust gas after collecting PM is discharged, so that the PM emission standards Exhaust at less than the value is realized (Patent Document 1).

  This DPF is intended to reduce the amount of PM emission by collecting PM contained in the exhaust gas by a built-in filter, but the exhaust gas temperature in the DPF is lower than the combustion temperature of PM. If it is used, PM accumulation on the filter progresses, and the filter eventually becomes clogged. If the exhaust resistance increases due to clogging of the filter, engine output decreases and fuel consumption deteriorates.

  Therefore, the DPF main body provided in the exhaust passage of the diesel engine accommodates an oxidation catalyst, a heater, a supplementary fuel injection means, etc. in addition to the filter, and a temperature sensor attached to the outer periphery of the DPF main body or in the exhaust passage. A detection means comprising electronic parts such as a pressure sensor is provided, and the DPF main body is controlled by monitoring the temperature and pressure in the DPF main body based on the detection signal from the detection means and controlling the heater and the auxiliary fuel injection means. There has been proposed an apparatus in which the temperature inside is set to be equal to or higher than the activation temperature of the oxidation catalyst so that the PM collected by the filter can be combusted to regenerate the filter (Patent Document 1 [0032] column, etc.).

Japanese Patent No. 5404695

  The DPF main body provided in the exhaust passage of the diesel engine becomes hot when the high-temperature exhaust gas from the diesel engine is introduced and the PM accumulated on the filter burns in the DPF main body. Yes.

  Therefore, as described above, when electronic components are provided on the outer periphery of the DPF main body or in the vicinity of the outer periphery, the electronic components may be damaged because they are heated to a high temperature by the radiant heat of the DPF main body.

  In the invention described in the above-mentioned Patent Document 1, in order to prevent electronic parts such as sensors attached to the DPF main body from being damaged by heating, the cooling air generated by the fan housed in the soundproof box is removed from the soundproof box. By disposing the DPF main body in the air passage for guiding and releasing the air, it is possible to cool the control device attached to the outer periphery of the DPF main body so that a part of the exhausted air flows through the outer periphery of the DPF during blowing by the fan. I am doing so.

  However, in this configuration, when the engine-driven work machine is stopped, the fan driven by the engine is also stopped, so that the air blowing to the electronic components arranged on the outer periphery of the DPF main body or in the vicinity of the outer periphery is also stopped.

  On the other hand, the DPF main body is not immediately cooled even when the engine is stopped, and is still in a high temperature state for a while after the stop.

  Therefore, the electronic components provided on the outer periphery of the DPF main body or in the vicinity of the outer periphery are still exposed to the risk of damage due to the residual heat of the DPF main body.

  In particular, in the engine-driven work machine described in the above-mentioned Patent Document 1, if the temperature in the DPF body is excessively decreased, the combustion / decomposition efficiency of the PM collected by the filter is reduced. In order to prevent the generated exhaust air from directly hitting the DPF main body, the DPF main body is arranged inside the corner where the partition plate separating the engine room and the air passage and the top plate of the soundproof box intersect. Therefore, when the exhaust from the fan stops due to the engine stop, the radiant heat from the DPF main body is not easily dissipated in this corner, so the electronic components arranged on the outer periphery of the DPF main body or in the vicinity of the outer periphery are Even after the engine is stopped, it will be exposed to high temperatures for a relatively long time.

  In the above-mentioned patent document 1, the temperature sensor and the pressure sensor provided as control parts for controlling the operation of the heater provided in the DPF and the auxiliary fuel injection means are targeted for cooling. Without being limited thereto, when electronic parts and their accessory devices are provided on the outer periphery of the DPF or in the vicinity of the outer periphery, these may also be damaged by the heat of the DPF main body, and thus need to be cooled.

  Therefore, the present invention has been made to solve the above-mentioned drawbacks of the prior art, and not only during the operation of the engine-driven work machine, but also after the engine-driven work machine has stopped, By providing an engine-driven work machine having a structure capable of introducing cooling air to the electronic components arranged at or near the outer periphery of the DPF main body while the DPF main body is in a high temperature state, The purpose is to prevent damage to electronic components due to heat.

  Hereinafter, means for solving the problem will be described together with reference numerals used in the embodiment for carrying out the invention. This code is used to clarify the correspondence between the description of the scope of claims and the description of the mode for carrying out the invention. Needless to say, it is used in a limited manner for the interpretation of the technical scope of the present invention. It is not a thing.

In order to achieve the above object, the engine-driven work machine 1 of the present invention includes:
A work machine 3 such as a compressor or a generator, an engine 5 that drives the work machine 3, and an exhaust gas aftertreatment device (DPF) that removes particulate matter (PM) contained in the exhaust gas of the engine 5 In the engine-driven work machine 1 in which 7 is housed in a soundproof box 9,
The exhaust gas after-treatment device (DPF) 7 is disposed in the exhaust passage 51 of the engine 5, a processing device body (DPF body) 71 containing a filter, an outer periphery of the processing device body 71, and / or The electronic component 72 is arranged near the outer periphery.
The soundproof box 9 is provided with a duct 6 having one end 6a opened close to the electronic component 72 and the other end 6b communicating with the outside of the soundproof box 9,
An opening 91 that communicates the inside and outside of the soundproof box 9 is provided at any position on the outer wall surface including the upper surface of the soundproof box 9 at a higher position than the one end 6a of the duct 6;
When the engine-driven work machine 1 is stopped, the air in the soundproof box 9 heated by the residual heat of the equipment accommodated in the soundproof box 9 rises and is released through the opening 91. the end 6a and the opening 91 of the duct 6, wherein the communicated via the space within the soundproof box 9, the outside air sucked through the duct 6 into the soundproof box 9 became negative characterized by being configured as (claim 1), thereby, until after the engine stop-driven work machine 1, is accommodated in the device in the soundproof box 9 is cooled, the said duct 6 The flow of cooling air from the other end 6b through the periphery of the electronic component 72 to the opening 91 is generated.

In the engine-driven work machine 1 having the above-described configuration, a partition wall 92 that partitions the inside of the soundproof box 9 into two chambers is provided, and the work machine 3 and the engine 5 are accommodated in one chamber partitioned by the partition wall 92. The engine chamber 9a and the other chamber serve as a ventilation path 9b, and the engine chamber 9a and the ventilation path 9b communicate with each other via a communication port 93 provided in the partition wall 92.
A fan 52 is provided that generates a flow of cooling air that blows out air in the engine chamber 9a toward the air passage 9b or sucks air in the air passage 9b toward the engine chamber 9a.
The exhaust gas aftertreatment device (DPF) 7 may be disposed in the air passage 9b (claim 2).

  In this case, the partition wall 92 is arranged in the vertical direction, the opening 91 is formed in the upper part of the air passage 9b, and the electronic component 72 is arranged at a high position with respect to the processing apparatus main body (DPF main body) 71. The duct 6 is provided on the side wall of the soundproof box 9 facing the partition wall 92, and the one end 6a of the duct 6 is located above the upper end position of the processing apparatus main body (DPF main body) 71, It is preferable to open below the electronic component 72 (Claim 3).

  Further, preferably, the air guide plate 20 that covers the upper part of the electronic component 72 and guides the cooling air can be provided inside the soundproof box 9 and separated from the opening 91 (Claim 4). .

  It should be noted that all or part of the side wall of the soundproof box 9 on the side of the exhaust gas aftertreatment device (DPF) may be detachable or openable to form an inspection door (Claim 5). 6 may be formed on the inner surface of the inspection door (claim 6).

  With the configuration of the present invention described above, according to the engine-driven work machine 1 of the present invention, the following remarkable effects can be obtained.

  One end 6a is opened close to the electronic component 72 to be cooled, and the other end 6b is provided with a duct 6 that communicates with the outside of the soundproof box 9, and the duct 6 is disposed at a higher position than the one end 6a. By providing the opening 91 that communicates the inside and outside of the sound box 9, the electronic component 72 can be removed from the duct 6 while there is a risk of the electronic component 72 being damaged by the residual heat of the DPF main body 71 even after the engine-driven work machine 1 is stopped. It was possible to generate a flow of cooling air passing through the periphery of 72 and reaching the opening 91, and the introduction of cooling air to the electronic component 72 could be continued.

  That is, even when the engine-driven work machine 1 is stopped, the work machine 3, the engine 5, the DPF 7, the heat exchanger 53 (radiator or oil cooler), etc. accommodated in the soundproof box 9 have residual heat. During this time, the air in the soundproof box 9 is warmed, and as a result of the warmed air rising in the soundproof box 9, the air is discharged outside the soundproof box 9 through the opening 91.

  In this way, when the air in the soundproof box 9 is released outside the machine through the opening 91, the inside of the soundproof box 9 becomes negative pressure, so the duct 6 communicating between the inside and outside of the soundproof box 9 is provided. The cold air outside the soundproof box 9 is sucked in through (so-called chimney effect).

  Since one end 6a of the duct 6 is opened near the electronic component 72 as described above, relatively cool air outside the soundproof box 9 is introduced into the vicinity of the electronic component 72 to cool the electronic component 72. can do.

  As described above, the cooling of the electronic component 72 according to the configuration of the present invention uses natural convection caused by the temperature difference of the air. Therefore, no power is required, and the device accommodated in the soundproof box 9 is connected to the outside air temperature. This is surely continued until the temperature is cooled to the same temperature, and therefore, there is no risk of the electronic component 72 being damaged by heat due to the residual heat of the DPF main body 71.

  Specifically, in the configuration of the embodiment described later, the ambient temperature of the electronic component 72 to be cooled could be kept at a temperature of 120 ° C. or lower.

  In the configuration in which the DPF 7 is provided in the above-described air passage 9b through which the cooling air generated by the rotation of the fan passes, the electronic component 72 can be suitably cooled when the engine-driven work machine 1 is stopped. The electronic component 72 could be suitably cooled by the cooling air generated by the fan 52 when the engine-driven work machine 1 was in operation.

  Thus, in the configuration in which the DPF 7 is arranged in the ventilation path 9b, the partition wall 92 is further arranged in the vertical direction, the opening 91 is formed in the upper part of the ventilation path 9b, and the electronic component 72 is mounted on the DPF main body 71. The duct 6 is provided on the side wall of the soundproof box 9 facing the partition wall 92, and one end 6a of the duct 6 is above the upper end position of the DPF main body 71 and below the electronic component 72. In the structure opened by the fan 52, when the cooling air is generated by the fan 52, it is possible to restrict the introduction of the cooling air to the DPF main body 71 while ensuring the flow of the cooling air amount toward the electronic component 72. It was possible to prevent the degradation of the PM decomposition ability and the combustion ability caused by excessive cooling of 71.

  Furthermore, in the structure in which the air guide plate 20 covering the upper part of the electronic component 72 is provided in the soundproof box 9 and separated from the opening 91, the soundproof box 9 is provided through the opening 91. Even when rainwater enters, not only can the electronic component 72 be prevented from getting wet, but also the cold air introduced through the duct 6 does not immediately go to the opening 91 due to the rising airflow in the air passage 9b. The electronic component 72 can be cooled while flowing along the lower surface of the air guide plate 20, and a part of the flow of the cooling air generated by the fan 52 is induced when the engine-driven work machine 1 is driven. The introduction of the cooling air to the DPF main body 71 can be restricted while introducing the cooling air to the electronic component 72.

  In the configuration in which the entire or part of the side wall of the soundproof box 9 on the side of the exhaust gas after-treatment device (DPF) 7 is detachable or openable, the inspection door can be used to check the DPF 7 accommodated in the soundproof box 9. In addition to easy maintenance, the duct 6 can be easily inspected with the structure in which the duct 6 is attached to the inner surface of the door.

Explanatory drawing explaining the flow (at the time of a stop) of the cooling wind in the engine drive type working machine of this invention which has arrange | positioned DPF in the ventilation path. Explanatory drawing explaining the flow (cooling type / at the time of driving) of the cooling wind in the engine drive type working machine of this invention which has arrange | positioned DPF in the ventilation path. Explanatory drawing explaining the flow (cooling type / at the time of driving) of the cooling wind in the engine drive type working machine of this invention which has arrange | positioned DPF in the ventilation path. Explanatory drawing which shows the whole structure of the engine drive type working machine of this invention. Explanatory drawing explaining the flow (cooling type / common at the time of a drive and a stop) of the cooling wind in the engine drive type working machine of this invention which has arrange | positioned DPF in an engine room.

  Hereinafter, an engine-driven working machine 1 according to the present invention will be described with reference to the accompanying drawings.

〔overall structure〕
4 and 5 show the overall structure of the engine-driven work machine 1 of the present invention.

  As shown in FIGS. 4 and 5, the engine-driven work machine 1 of the present invention includes a work machine 3 such as a compressor and a generator, an engine (diesel engine) 5 for driving the work machine 3, and the engine 5. An exhaust gas aftertreatment device (DPF) 7 provided in an exhaust passage (exhaust pipe) 51 and other necessary equipment are housed in a soundproof box 9.

  In the illustrated embodiment, the inside of the soundproof box 9 is divided into two chambers by a partition wall 92 arranged in the vertical direction, and one chamber is divided into an engine chamber 9a for accommodating the work implement 3 and the engine 5, and the other chamber is divided into two chambers. A heat exchanger 53 such as a radiator or an oil cooler for cooling the engine 5 and the work implement 3 is disposed in addition to the communication port 93 provided in the partition wall 92 and the communication port 93. And a fan 52 for generating cooling air that passes through the heat exchanger 53 is disposed opposite to the heat exchanger 53, and when the engine 5 is operated, the fan 52 is rotated to connect the heat exchanger 53 and the communication port 93. The passing cooling air can be generated.

  In the embodiment shown in FIG. 4, when the engine 5 is operated, the fan 52 generates a flow of cooling air from the engine chamber 9a side to the air passage 9b side, and is formed on the top plate of the soundproof box 9 above the air passage 9b. A so-called “blowing type” configuration is employed in which the air in the soundproof box 9 is released through the opened opening 91, but on the contrary, the fan 52 rotates to move the air passage 9 b to the engine room 9 a. By causing the flow of the cooling air to flow, the outside air introduced into the soundproof box 9 through the opening 91 and the air passage 9b can be introduced into the engine room 9a after passing through the heat exchanger 53. It may be configured as a so-called “suction type” (see FIG. 3).

  In the illustrated embodiment, the opening 91 described above is opened in the top plate of the soundproof box 9 above the air passage 9b. However, the opening 91 is provided above one end 6a of the duct 6 described later. If provided, the soundproof box 9 is not limited to the top plate but may be provided on the side wall, or may be provided on the top plate or side wall of the engine compartment 9a. As long as the air in the soundproof box 9 that is warmed and raised by the residual heat of the accommodated equipment can be discharged to the outside of the soundproof box 9, it may be provided at any position.

  In the embodiment shown in FIGS. 1 to 4, the DPF 7 is provided in the above-described air passage 9b, preferably at a position lower than an intermediate position in the height direction of the air passage 9b.

  In the illustrated embodiment, the DPF main body 71 is mounted on a mounting table 94 provided in the air passage 9 b, and the DPF main body 71 is disposed at a substantially central position in the height direction of the heat exchanger 53.

  1-4, it is not limited to the structure which arrange | positions DPF7 in the ventilation path 9b, as shown in FIGS. 1-4, DPF7 is good also as what arrange | positions this in the engine room 9a, and in the example shown in FIG. The DPF 7 is disposed on the upper part of the engine flywheel housing.

  The DPF 7 is a device that reduces the PM emission amount by removing PM from the exhaust gas of the engine (diesel engine) 5, and has a built-in filter provided in the exhaust passage (exhaust pipe) 51 of the engine 5. The DPF main body 71, and the outer periphery of the DPF main body and the outer periphery of the DPF main body, and for example, the temperature and pressure in the DPF main body are detected and output to an engine operation control means (ECU) (not shown). An electronic component 72 is provided.

  For example, the electronic component 72 detects the temperature and pressure in the DPF main body 71 and in the exhaust passage communicating with the DPF main body 71, and converts sensors such as pressure sensors and temperature sensors, and detection signals of the sensors. This includes electronic components such as signal converters, wiring and connectors that communicate between these devices, and other necessary accessories, including electronic components that may be damaged by the heat of the DPF body and their associated devices. If there is, it is not limited to the said control part, Other electronic components are good also as what is included in the cooling object in this application.

  In the illustrated embodiment, the object to be cooled is the electronic component 72 arranged above the vicinity of the outer periphery of the DPF main body 71, such as a signal converter, among such electronic components 72, but the object to be cooled is These may be electronic components attached to the outer periphery of the DPF main body 71, such as a detection means such as a temperature sensor or a pressure sensor, or both of them may be simultaneously cooled.

  The soundproof box 9 in which the DPF 7 is housed in this manner is provided with a duct 6 having one end 6a opened near the electronic component 72 of the DPF 7 and the other end 6b communicating with the outside of the soundproof box 9. When the blowing by the fan 52 is stopped by the stop, cold air outside the soundproof box 9 is introduced as cooling air near the electronic component 72 through the other end 6b of the duct 6 and reaches the opening 91 to reach the soundproof box. 9 A flow of cooling air discharged to the outside is formed.

  In the embodiment shown in FIG. 4, a rectangular opening 61 is formed in the side wall of the soundproof box 9 that defines the air passage 9 b and faces the partition wall 92, and the opposing plate 62 a that faces the inner surface of the side wall is formed. A guide plate 62 having a bottom plate 62b protruding from the bottom side of the counter plate 62a and side plates 62c and 62d protruding from two sides in the height direction of the counter plate 62a is provided on the inner surface of the side wall at the position where the opening 61 is formed. The aforementioned duct 6 is formed by mounting.

  Note that the configuration of the duct 6 is not limited to the configuration shown in FIG. 4. For example, as shown in FIG. 5, one end of a cylindrical or rectangular tube-shaped tube material that forms the duct 6 is arranged in the vicinity of the electronic component 72. At the same time, the other end may be configured to communicate with an opening formed in the side wall or the bottom wall of the soundproof box 9.

  As will be described later, the introduction of the cooling air performed through the duct 6 causes the air inside the soundproof box 9 to be discharged outside the soundproof box 9 through the opening 91, thereby causing the inside of the soundproof box 9 to be introduced. Since this is performed by using the negative pressure, the positions of the electronic component 72 to be cooled and the one end 6a (electronic component side) and the other end 6b (intake port side) of the duct 6 in the height direction. The relationship is not particularly limited. For example, the electronic component 72, the one end 6a of the duct 6, and the other end 6b of the duct 6 can be arranged at the same height.

  However, in order to prevent rainwater from entering the soundproof box 9 through the duct 6 and preventing the invading rainwater from wetting the electronic component 72, the one end 6a of the duct 6 is positioned lower than the electronic component 72. Furthermore, it is preferable to arrange the other end 6b at a lower position than the one end 6a of the duct 6.

  Further, among the side walls of the soundproof box 9, all or a part of the side walls adjacent to the DPF 7 may be detachable, or may be configured to be openable and closable to form an inspection door. The duct 6 described above may be formed or attached to the inspection door.

  When configured in this manner, all or a part of the side wall is removed or opened to maintain the DPF main body 71 and the electronic component 72 disposed in the outer periphery of the DPF main body 71 and in the vicinity of the outer periphery. 6 can be easily inspected.

[Cooling action when the work equipment is stopped]
・ Configuration with DPF in the air passage (Figs. 1-4)
Of the engine-driven work machine 1 configured as described above, the cooling action at the time of stop in the engine-driven work machine 1 adopting the configuration in which the DPF 7 is disposed in the air passage 9b will be described with reference to FIG. explain.

  1 employs a configuration in which the DPF 7 is disposed in the air passage 9b in the blow-out type engine-driven working machine. However, the cooling action when the fan 52 is stopped is as follows. There is no difference between the blow-in type and the suction type, and the following description also serves as a description in the case of adopting a configuration in which the DPF 7 is arranged in the air passage 9b in the suction-type engine-driven work machine.

  Moreover, in any structure of the blowout type and the suction type, as shown in FIGS. 1 to 4, when the DPF 7 is arranged in the air passage 9 b in which the opening 91 is formed in the upper part, the upper part of the electronic component 72 is covered. The air guide plate 20 is attached at a position spaced apart from the opening 91 so as not to block the opening 91, or in a substantially intermediate position in the height direction between the electronic component 72 and the opening 91 in the illustrated embodiment. As a result, it is possible to prevent the electronic component 72 from getting wet by rainwater that has entered the soundproof box 9 through the opening 91, and to induce the flow of cooling air.

  When such an air guide plate 20 is provided, the size (area in plan view) is preferably substantially the same as the size of the DPF main body 71, but the air passage is directed toward the opening 91 provided thereabove. The flow area of the air passage 9b (cross-sectional area in the horizontal direction on the paper surface) is sufficiently small so as not to disturb the flow of the updraft flowing in the air passage 9b.

  When the engine 5 is stopped in the engine-driven work machine 1 configured as described above, the fan 52 driven by the engine 5 also stops rotating, and the rotation of the fan 52 leads to the air passage 9b from the engine chamber 9a. The generation of cooling air that has been discharged to the outside through the opening 91 is also stopped.

  On the other hand, the DPF main body 71 and the heat exchanger 53 that are at a high temperature due to the operation of the engine 5 and the work machine 3 are not immediately cooled even when the engine 5 and the work machine 3 are stopped, and are still in a high temperature state. , The temperature of the air in the air passage 9b is higher than that of the outside air due to heat radiation from these devices.

  Therefore, air having a higher temperature than the outside air in the air passage 9b rises in the air passage 9b, is discharged outside the soundproof box 9 from the opening 91 provided in the top plate of the soundproof box 9, and diffuses upward. Ascending air current is generated, and the air in the ventilation path 9b is released by the ascending air current, so that the inside of the ventilation path 9b becomes negative pressure.

  As a result, cold air outside the soundproof box 9 is introduced into the ventilation path 9b through the duct 6 having one end 6a opened in the ventilation path 9b and the other end 6b communicating with the outside of the soundproof box 9. So-called chimney effect).

  Since one end 6a of the duct 6 is open near the electronic component 72, the outside air introduced through the duct 6 is introduced near the electronic component 72 to effectively cool the electronic component 72. As a result, it is possible to prevent the electronic component 72 from being damaged due to a high temperature due to the radiant heat from the DPF main body 71.

  In particular, in the configuration provided with the air guide plate 20 that covers the electronic component 72 as shown in FIGS. 1 to 4, not only can rain water adhere to the electronic component 72 but also the low temperature introduced through the duct 6. The electronic component 72 is cooled while the outside air flows along the lower surface of the air guide plate 20 between the DPF main body 71 and the air guide plate 20 without immediately going to the opening 91 by the rising air current in the air passage 9b. The cooling effect can be improved.

  In order to effectively introduce the cooling air using such a chimney effect, the DPF main body 71 in the air passage 9b may be arranged at a position lower than the center in the height direction of the air passage 9b. preferable.

・ Configuration with DPF in the engine compartment (Fig. 5)
As shown in FIG. 5, in the configuration in which the DPF 7 is arranged in the engine room 9 a, the air in the air passage 9 b heated by the residual heat of the heat exchanger 53 rises and goes outside through the opening 91. The air passage 9b is negatively discharged.

  On the other hand, the air in the engine chamber 9a also rises by being warmed by the residual heat of the DPF main body 71, the work implement 3, and the engine 5, but the air rising in the engine chamber 9a is a negative pressure as described above. A flow of air that is drawn to the side of the path 9 b and reaches the inside of the ventilation path 9 b through the communication port 93 provided in the partition wall 92 and is released to the outside of the soundproof box 9 through the opening 91 is generated.

  As a result, the engine chamber 9a also has a negative pressure, and the air outside the soundproof box 9 is introduced into the engine chamber 9a in the vicinity of the electronic component 72 through the duct 6 communicating between the engine chamber 9a and the soundproof box 9. Thus, the electronic component 72 is preferably cooled.

  In the embodiment shown in FIG. 5, the air in the soundproof box 9 is released by the thermal convection when the fan 52 is stopped through the air passage 9b and the opening 91 formed above the air passage 9b. However, instead of this configuration, an opening for releasing the upward air flow generated in the engine room 9a to the outside of the machine is formed on the wall surface of the soundproof box that defines the engine room 9a, for example, the top plate of the engine room 9a. It is good to do.

  In this way, when the opening 91 is formed in the top plate of the engine compartment 9a, and the electronic component 72 is disposed below the opening 91, the air guide plate is disposed on the electronic component 72. May be adopted.

[Operation during operation of work equipment]
In contrast to the cooling action when the engine-driven work machine 1 is stopped as described above, the cooling action when the engine-driven work machine 1 is operated, that is, when the fan 52 is rotating, is as follows.

-Balloon type configuration (Fig. 2)
With reference to FIG. 2, the cooling action at the time of rotation of the fan 52 in the case where the engine-driven work machine 1 having the configuration in which the DPF 7 is arranged in the air passage 9b is configured as a blow-out type will be described.

  When the air in the engine compartment 9a is blown out toward the air passage 9b by the fan 52 through the communication port 93 formed in the partition wall 92, most of the cooling air introduced into the air passage 9b is in the air passage 9b. It is discharged outside through the opening 91 provided above.

  On the other hand, a part of the air in the engine chamber 9a introduced into the air passage 9b by the fan 52 moves in the horizontal direction to cool the electronic component 72, and cools the electronic component 72 and the DPF main body 71. Along with the radiant heat, the heat is released outside the soundproof box 9 through the duct 6 opened near the electronic component 72.

  In particular, in the configuration in which the above-described air guide plate 20 is provided, the air guide plate 20 that covers the upper part of the electronic component 72 not only prevents the electronic component 72 from getting wet with rainwater, but also the cooling air generated by the fan 52. The function of guiding the flow in the horizontal direction toward the electronic component 72 and the duct 6 is exhibited.

  In this way, when the work machine is driven, and therefore when the fan 52 is rotated by the engine 5, the surroundings of the electronic component 72 are always cooled by flowing cooling air. The electronic component 72 is prevented from reaching a high temperature despite being disposed in the vicinity of the outer periphery of the DPF main body 71, and the main flow of the generated cooling air is discharged through the opening 91. However, since only a part of the cooling air is introduced into the DPF main body 71, the DPF main body 71 is not cooled more than necessary and the temperature of the PM generated due to the temperature in the DPF main body 71 decreasing is reduced. It is possible to suitably prevent the degradation of the decomposition ability and the combustion ability.

  In particular, in the configuration in which the duct 6 is provided on the side wall facing the partition wall 92 and one end 6a (electronic component side) of the duct 6 is opened at a position higher than the upper end of the DPF main body 71 and lower than the electronic component 72, Although the flow of the cooling air that has passed through the part 72 is smoothly discharged to the outside through the one end 6a of the duct 6, the flow of the cooling air that tries to pass through the portion of the DPF main body 71 has no destination and is suppressed. Therefore, the effect of suppressing the introduction of cooling air to the DPF main body 71 can be further enhanced.

・ Suction type configuration (Fig. 3)
In contrast to the blow-out type engine-driven work machine described with reference to FIG. 2, in the suction-type engine-driven work machine shown in FIG. When the rotation of the fan 52 is started by starting the engine 5 that drives the work machine 3, the outside air introduced into the air passage 9b through the opening 91 is communicated with the heat exchanger 53 provided in the partition wall 92 and the communication with the heat exchanger 53. The cooling air introduced into the engine room 9a through the port 93 and the cooling air introduced into the engine room 9a cools the engine 5 and the work implement 3 and then the wall surface of the soundproof box that defines the engine room 9a. It is comprised so that it can discharge | release to the exterior through the exhaust port (not shown) formed in this.

  Thus, when the air in the air passage 9b is sucked into the engine chamber 9a by the rotation of the fan 52, the air outside the soundproof box 9 is introduced into the air passage 9b through the opening 91. In addition, outside air is also introduced through the duct 6.

  As described above, the duct 6 is open at the one end 6a in the vicinity of the electronic component 72 to be cooled, so that the electronic component 72 is cooled by the cooling air introduced into the air passage 9b through the duct 6. It can cool suitably.

  In this suction-type configuration, when the air guide plate 20 is provided to cover the electronic component 72, the air guide plate 20 is attached to the electronic component 72 by cooling water introduced through the duct 6. In addition to guiding the wind, it also functions as a guide plate that guides the cooling air introduced into the air passage 9 b through the opening 91 toward the communication port 93 provided in the partition wall 92.

  As a result, the outside air introduced into the air passage 9b through the opening 91 can be made difficult to come into direct contact with the DPF main body 71, and the temperature of the DPF main body 71 is prevented from lowering more than necessary. .

  Also, the cooling air introduced through the duct 6 directly contacts the DPF main body 71 by opening the one end 6a of the duct 6 at a position below the electronic component 72 and higher than the upper end of the DPF main body 71. It is difficult to configure.

  Therefore, even in the configuration of the suction-type engine-driven work machine shown in FIG. 3, when the work machine 3 is operated, the DPF main body 71 is cooled more than necessary, so that the PM decomposition performance and the combustion performance are lowered. Can be prevented.

・ Configuration with DPF in engine compartment (Fig. 5)
As shown in FIG. 5, in the structure in which the DPF 7 is arranged in the engine chamber 9 a in the blowout type engine-driven working machine, the air in the engine chamber 9 a is introduced into the air passage 9 b by the fan 52. Since a negative pressure is generated in 9a and the cooling air is introduced toward the electronic component 72 through the duct 6 by this negative pressure, the flow of the cooling air generated in the soundproof box 9 is generated when the fan 52 is stopped. This is the same as the flow of cooling air in FIG. 5, as indicated by the arrows in FIG.

  In the configuration shown in FIG. 5, the configuration in which the DPF 7 is disposed in the engine chamber 9a is adopted in the blow-out configuration, but the DPF is disposed in the engine chamber 9a in the configuration of the suction-type engine-driven compressor. The arrangement may be adopted, and in this case, the flow of the cooling air during the rotation of the fan 52 is in the direction opposite to the arrow shown in FIG.

DESCRIPTION OF SYMBOLS 1 Engine drive type working machine 3 Working machine 5 Engine 51 Exhaust path (exhaust pipe)
52 Fan 53 Heat exchanger 6 Duct 6a One end (of the duct)
6b The other end (of the duct)
61 Opening 62 Guide plate 62a Opposing plate 62b Bottom plate 62c, 62d Side plate 7 Exhaust gas aftertreatment device (DPF)
71 Processing unit body (DPF body)
72 Electronic parts 9 Soundproof box 9a Engine room 9b Air passage 91 Opening portion 92 Partition wall 93 Communication port 94 Mounting table 20 Air guide plate

Claims (6)

  1. In an engine-driven work machine in which a work machine, an engine that drives the work machine, and an exhaust gas aftertreatment device are housed in a soundproof box,
    The exhaust gas aftertreatment device includes a filter and a processing device main body provided in the exhaust path of the engine, and an electronic component disposed on the outer periphery of the processing device main body and / or in the vicinity of the outer periphery. age,
    The soundproof box is provided with a duct having one end opened close to the electronic component and the other end communicating with the outside of the soundproof box,
    Provided on the wall surface of the soundproof box at a height higher than the one end of the duct is an opening that communicates the inside and outside of the soundproof box,
    When the engine-driven work machine is stopped, the air in the soundproof box heated by the residual heat of the equipment housed in the soundproof box rises and is released through the opening. one end with said opening, and communicates with the air in said soundproof box, characterized by being configured via the duct in said soundproof box became negative pressure outside of the air sucked Engine-driven work machine.
  2. A partition wall that partitions the interior of the soundproof box into two chambers is provided, one chamber partitioned by the partition wall is an engine chamber that houses the working machine and the engine, and the other chamber is an air passage, and the engine chamber and the chamber The air passage is communicated through a communication port provided in the partition wall,
    Providing a fan that blows out air in the engine chamber toward the air passage, or generates a flow of cooling air that sucks air in the air passage toward the engine chamber;
    The engine-driven work machine according to claim 1, wherein the exhaust gas aftertreatment device is disposed in the air passage.
  3.   The partition wall is arranged in the vertical direction, the opening is formed in the upper part of the air passage, the electronic component is arranged at a high position with respect to the processing apparatus body, and the duct is opposed to the partition wall 3. The engine drive type according to claim 2, wherein the one end of the duct is opened above the upper end position of the processing apparatus main body and below the electronic component. Work machine.
  4.   4. The engine-driven work machine according to claim 3, wherein an air guide plate that covers an upper portion of the electronic component and guides cooling air is provided inside the soundproof box and spaced apart from the opening.
  5.   The engine-driven work machine according to any one of claims 1 to 4, wherein all or part of the side wall of the soundproof box on the side of the exhaust gas aftertreatment device is detachable or openable to form an inspection door. .
  6.   6. The engine-driven work machine according to claim 5, wherein the duct is formed on an inner surface of the inspection door.
JP2014161148A 2014-08-07 2014-08-07 Engine-driven work machine Active JP6473301B2 (en)

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Family Cites Families (10)

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Publication number Priority date Publication date Assignee Title
JPS6093092U (en) * 1983-12-02 1985-06-25
JP2739184B2 (en) * 1990-03-07 1998-04-08 ヤンマーディーゼル株式会社 Cooling system for soundproof engine
JP2005264870A (en) * 2004-03-19 2005-09-29 Denyo Co Ltd Sound insulating engine-driven working machine
JP5324952B2 (en) * 2009-02-10 2013-10-23 ヤンマー株式会社 Engine equipment
JP5404695B2 (en) * 2011-05-25 2014-02-05 デンヨー株式会社 Exhaust gas purification device layout structure for engine-driven work machines
JP5460645B2 (en) * 2011-06-07 2014-04-02 デンヨー株式会社 Engine drive work machine door
JP5939921B2 (en) * 2012-07-26 2016-06-22 ヤンマー株式会社 Engine equipment
JP5959492B2 (en) * 2013-12-18 2016-08-02 デンヨー株式会社 Exhaust duct for engine driven work machine
JP6147213B2 (en) * 2014-03-20 2017-06-14 ヤンマー株式会社 Engine equipment
JP6243765B2 (en) * 2014-03-20 2017-12-06 ヤンマー株式会社 Engine equipment

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