JP4614904B2 - Electrical component storage box for engine-driven work machines - Google Patents

Description

  The present invention relates to a cooling method for an electrical equipment storage box containing electrical equipment for controlling an engine driven working machine such as an engine driven compressor, generator, welder, or pump, and more particularly to a sealed electrical equipment. It relates to cooling inside the storage box.

  Conventionally, multiple electrical components are housed inside the enclosure of engine-driven work machines, and electrical components are stored in the electrical component storage box inside the housing in order to avoid malfunctions due to the ingress of rainwater and to prevent danger due to heat-generating parts and electric shocks. Arranged inside. The electrical component storage box employs a cooling structure that uses cooling air from a cooling fan disposed in the engine-driven work machine in order to suppress the heat generated by the internal electrical components below a predetermined temperature.

  As an example of a conventional example of cooling an electrical component of an engine-driven work machine, for example, FIGS. 3 and 2 of Patent Document 1 are shown in FIGS. In the following description of patent documents, the names are explained by the notation of the patent documents, and the codes are described by different codes in order to avoid confusion. It is disclosed as a device capable of efficiently and reliably cooling an electrical component, and will be described in detail below.

  The engine-driven work machine is formed by a base B as a base and a bonnet N mounted on the base B. In the bonnet N, an engine 210 having an engine fan 211, a welding generator G and a control device Y that are directly connected to the engine 210 are disposed on a base B serving as a base.

  The engine-driven work machine is cooled by sucking outside air by the engine fan 211 to cool the inside, and exhausting the exhausted heat to the outside of the hood N. A lower air inlet Ba is formed in the front wall B1 of the base B, and the cooling air sucked from the lower air inlet Ba passes through the communication port 232a and the communication port 232b formed on the upper surface of the lower duct 240, and the upper duct 230. The engine 210 is cooled through the engine duct 212 and then discharged to the outside.

  Further, an upper air inlet 235a is formed on the side wall surface of the upper duct 230. The air is sucked by the engine fan 211 together with the cooling air sucked from the lower air inlet Ba, and the engine 210 and the like are cooled through the engine duct 212 and then externally. It is structured to be discharged.

A DC reactor 221 and a battery 222, which are electrical components that need to be cooled, are disposed at positions where the cooling air from the upper air inlet 235a and the cooling air from the lower air inlet Ba are blown inside the upper duct 230. It is installed and cooled efficiently by direct cooling air.
Registered Utility Model Publication No. 3065852

  In recent years, the usage environment and installation environment of engine-driven work machines have diversified, and it is sometimes required to use engine-driven work machines in adverse environments containing dust, salt, and iron powder in the atmosphere. Since there are many cases where the installation is outdoors, there is a demand for having an electrical component storage box that is easy to waterproof and prevent, and to maintain and inspect electrical components.

  However, when used in the above-mentioned adverse environment, the example shown in FIGS. 7 and 8 is superior in terms of cooling efficiency because the cooling air cools while directly touching the electrical components, but it contains moisture, salt and iron. Since the electrical components may cause insulation failure due to dust etc., the function cannot be performed stably.

Means to solve the problem

  In order to solve the above-described problems, according to the present invention, at least an engine, a work machine body driven by the engine, and a cooling fan for sucking cooling air into the casing are provided in the casing. An engine-driven work machine provided with an electrical component storage box in which electrical components are stored in a cooling air passage formed in the housing, wherein the electrical component storage box forms a sealed structure, A cooling cover is screwed into at least one side wall surface of the electrical component storage box in an airtight state, and the cooling cover is fixed to the flat base member and the base member so as to be inside. A lid member that covers the interior of the electrical component storage box inside the interior space region that is covered with the lid member of the foundation member and faces the interior side of the electrical component storage box. At least an introduction communication port for introducing air into the internal space; At least one discharge communication port is provided on the other end side formed in the inner space region covered with the lid member on the same plane as the introduction communication port, thereby providing a ventilation passage in the cooling cover. A circulation fan is disposed in an annular ventilation path formed between the interior space of the electrical component storage box and the ventilation path in the cooling cover.

  In order to solve the above-described problems, in the present invention, as described in claim 2, in the electrical component storage box of the engine-driven work machine according to claim 1, the circulation fan is provided for each introduction communication port. The central axis is aligned with the central axis, and it is disposed immediately before the air inside the electrical component storage box is blown to the introduction communication port.

  In order to solve the above-mentioned problems, the present invention provides an electrical component storage box for an engine-driven work machine according to claim 1 or 2, wherein the electrical component storage box is as defined in claim 3. Is a substantially rectangular parallelepiped, and is formed to be long in the horizontal direction with respect to the vertical and depth dimensions, and the horizontal direction of the electrical component storage box is made to coincide with the cooling air flow direction of the cooling air passage in the engine-driven work machine.

  In order to solve the above-described problems, the present invention provides an electrical component storage box for an engine-driven work machine according to any one of claims 1 to 3, wherein the electrical component storage box is as described in claim 4. Is made of a metal material having high thermal conductivity.

  In order to solve the above-mentioned problems, according to the present invention, an electrical component storage box for an engine-driven work machine according to any one of claims 1 to 4, wherein the cooling in the casing is performed. The electrical component storage box disposed in the ventilation passage has at least an outer surface of the cooling cover with plate-like radiating fins extending in the flow direction and parallel to the flow of the cooling air that wraps around the electrical component storage box. Form one or more.

  In order to solve the above-mentioned problems, according to the present invention, an electrical component storage box for an engine-driven work machine according to claim 1 or 2, wherein the electrical component storage box is described in claim 6. There is a temperature detection means inside, and a circulation fan control means is formed that performs an operation stop operation of the circulation fan in accordance with the output of the temperature detection means.

  In order to solve the above-mentioned problems, according to the present invention, as described in claim 7, in the electric component storage box of the engine-driven work machine according to claim 6, the circulation fan control means is an electric component storage box. The number of circulating fans that are operated is controlled by the temperature inside the box.

The invention's effect

  The present invention has the following effects by being configured as described above.

  An electrical component storage box containing electrical components is formed in a sealed structure, and a cooling cover is provided on the side wall surface of the electrical component storage box so that it can be attached and detached to maintain an airtight state. It is. In addition, since the electrical component storage box is formed in an airtight state, the electrical components inside and outside are isolated from each other, and the electrical components disposed inside due to moisture or dust are adversely affected in any external environment. There is nothing.

  A metal electrical component storage box that is hermetically sealed and has excellent heat dissipation characteristics is disposed in the cooling ventilation passage formed in the casing of the engine-driven work machine, and the longitudinal direction of the electrical component storage box Is arranged in line with the direction in which the cooling air flows, so that the increase in pipe resistance in the cooling air passage can be minimized, so the decrease in the flow velocity is small and the cooling efficiency of the engine-driven work machine is impaired. There are few things.

  Further, since the longitudinal direction of the electrical component storage box is made to coincide with the flow direction of the cooling air, the outer surface area of the electrical component storage box in contact with the fast flow of the cooling air can be increased, so that the heat radiation effect can be increased.

  In addition, the cooling cover disposed on the side wall surface of the electrical component storage box has an internal ventilation passage in the cooling cover, and the ventilation passage in the cooling cover is introduced into one side end portion and discharged to the other end portion. The communication port is formed. The circulation fan disposed in engagement with the introduction communication port forcibly feeds the heat inside the electrical component storage box to the ventilation passage in the cooling cover and flows at high speed along the inner wall surface of the cooling cover. Since the heat of the circulating flow whose temperature has risen is efficiently absorbed by the cooling cover, the cooled circulating flow returns to the inside of the electrical component storage box again for cooling the electrical component from the discharge communication port.

  The cooling cover surface, which forms the outer surface of the electrical component storage box, has a cold cooling air flowing at high speed by the cooling fan of the engine-driven work machine, and a warm circulating air by the circulation fan flows at high speed inside. . With this configuration, the internal heat can be efficiently discharged to the outside while being an air-cooled electrical equipment storage box that is hermetically sealed.

  In addition, in the cooling ventilation passage through which cool cooling air flows by the cooling fan of the engine-driven work machine, plate-like radiating fins extending in the flow direction and parallel to the flow of the cooling air are provided on the outer surface of the cooling cover. Since at least one or more are formed, the heat radiation area is increased, and the cooling efficiency is further improved.

  Further, since at least one or more plate-like heat radiation fins extending in the flow direction and extending in the flow direction are formed on the outer inner wall surface of the cooling cover air passage, the temperature inside the electrical component storage box has increased. The circulating air is more absorbed by the heat radiating fins and carried to the outside, and the interior of the electrical component storage box is further cooled.

  Also, the temperature detection means for the room temperature is provided inside the electrical component storage box, and the control means for controlling the operation stop of the circulation fan based on the temperature detection means is provided, so that the room temperature inside the electrical component storage box is predetermined. When the temperature is lower than the temperature, it is not necessary to operate the circulation fan, so that power saving operation can be performed.

  In addition, when a plurality of circulation fans are provided, the control means can operate the necessary number of circulation fans according to the temperature rise of the room temperature inside the electrical component storage box. , More power-saving operation.

BEST MODE FOR CARRYING OUT THE INVENTION

  Examples of the present invention will be described below with reference to FIGS.

  1 is a cross-sectional view showing the inside of an electrical component storage box according to an embodiment of the present invention, FIG. 2 is a front view of the electrical component storage box, and a cross-sectional view taken along line AA of FIG. This will be described in detail below.

  An electrical component storage box 80 is disposed in a cooling air passage 110a through which cooling air is formed, which is formed inside the casing of the engine-driven work machine, and the electrical component storage box 80 includes an electrical component 70 that generates heat and a substrate. A control board 72 on which electronic components and the like are disposed, other electrical components 73, and the like are stored in a state of being sealed from the outside. Further, a temperature detecting means 75 is disposed on the internal ceiling surface of the electrical component storage box 80, and the control board 72 having a signal output of the temperature detecting means 75 and an operation control function of a circulating fan 91 described later. Then, the operation of the circulation fan 91 is stopped and the required number of operation of the circulation fans is controlled.

  The electrical component storage box 80 is a box formed in a substantially rectangular parallelepiped shape. The closed side surface having the ceiling member 80a, the floor member 80c, and the like, and the right and left sides in FIG. An opening 80e that is opened leaving the portion 80b is formed. An opening (not shown) similar to the opening 80e is also formed on the right side of the drawing in FIG. The opening is required for maintenance and inspection of electrical components stored in the electrical component storage box 80.

  The opening 80e is detachably attached to the cooling cover 81 and is airtightly closed. The cooling cover 81 is formed of a flat plate-like base member 81a and a box-like lid member 81d that covers the outer side of the base member so as to form an internal space, and is screwed to the edge portion 80b by a plurality of bolts 90. The internal space is formed airtight from the outside of the electrical component storage box 80.

  On the surface of the base member 81a at the end covered with the lid member 81d which is the outer wall surface of the cooling cover 81, the introduction communication port 81b is connected to the upper part and the discharge communication port 81c is connected to the inside of the electrical component storage box. Is formed. A circulation fan 91 is arranged immediately before the air in the electrical component storage box 80 is blown to the introduction communication port 81b by aligning the axial center with the central axis of each introduction communication port 81b.

  The circulation fan 91 allows the air whose temperature has risen due to heat generated by the electrical component 70 or the like stored in the electrical component storage box 80 to enter the cooling cover ventilation passage 81e formed in the cooling cover 81 from the introduction communication port 81b. The air flow path 81e in the cooling cover flows downward from above and returns to the inside of the electrical component storage box 80 from the discharge communication port 81c.

  The circulating flow in the cooling cover internal ventilation path 81e is formed so that the space between the left and right wall surfaces of the lid member 81d, which is the outer wall surface, and the base member 81a, which is the inner wall surface, is narrow. Even if the number of surfaces is increased, the ventilation cross-sectional area of the cooling cover internal ventilation path 81e can be suppressed to a predetermined cross-sectional area, and the heat flow can be efficiently exchanged because the flow velocity is not reduced. The circulating flow after being cooled by heat exchange returns to the inside of the electrical component storage box 80 from the discharge communication port 81c.

  FIG. 3 is a sectional view of the inside of the front view shown in FIG. 2, and will be described in detail below. The electrical component storage box 80 is formed of a ceiling member 80a, a floor member 80c, a side plate 80d on the left side in the figure, a cooling cover 85 on the right side in the figure, and a cooling cover 81 disposed on the front side and the back side in the figure, and is screwed. Other than the cooling cover, it is formed as an integral structure.

  A sealed space in the electrical component storage box 80 stores the electrical component 70 that generates heat, a control board 72 in which electronic components are arranged on the substrate, other electrical components 73, and the like. The cooling cover 85 is formed by a flat base member 85a and a box-shaped lid member 85d that covers the outer side of the base member so as to form an internal space. 80 is configured to be airtightly screwed so as to cover an opening 80f formed at the right end of the figure 80.

  An inlet communication port 85b is formed in the upper portion and a discharge communication port 85c is formed in the lower portion on the surface of the base member 85a at the end portion covered with the lid member 85d that is the outer side surface of the cooling cover 85. The circulation fan 91 is arranged immediately before the air in the electrical component storage box 80 is blown to the introduction communication port 85b by aligning the axis with the central axis of the introduction communication port 85b.

  The circulation fan 91 feeds the heated air inside the electrical component storage box 80 from the introduction communication port 85b, blows air from the upper side to the lower side of the ventilation passage 85e in the cooling cover, and again from the discharge communication port 85c. Return to the inside as a circulating flow.

  The cooling cover internal ventilation path 85e is a narrow ventilation path sandwiched between wall surfaces of a flat plate-shaped base member 85a and a box-shaped lid member 85d covering the base member 85a, and the cross-sectional area of the ventilation path is In order to ensure, the depth in the depth direction is formed long from the front side of the drawing sheet with respect to the above-described width in the left-right direction in the drawing. For this reason, since the circulating flow is made to flow at high speed without staying in a narrow space while touching the surface area of the lid member 85d cooled from the outside, the heat of the heated air is efficiently transferred to the lid member 85d. Can be exchanged.

  The cooling cover 81 detachably disposed on the rear surface of the electrical component storage box 80 is detachably screwed into an edge portion 80b formed around an opening 80e opened on one side of the electrical component storage box 80. It is installed. A flat base member 81a of the cooling cover 81 is screwed to the edge portion 80b, and a box-shaped lid member 81d covers the cooling cover internal ventilation path 81e on the back side of the base member 81a in the figure.

  The flat base member 81a of the cooling cover 81 is an inner wall surface that forms the cooling cover air passage 81e and faces the electrical component storage chamber side. Two introduction communication ports 81b are formed in the upper part of the space that forms the cooling cover internal ventilation path 81e, and a discharge communication port 81c is formed at the lowermost end of the introduction communication opening 81b that contacts the cooling cover internal ventilation path 81e. .

  A circulation fan 91 for sending the heated air in the electrical component storage box 80 to each introduction communication port 81b is arranged in front of the opening of the introduction communication port 81b in accordance with the central axis of the introduction communication port 81b. With this configuration, the heated air in the electrical component storage box 80 exchanges heat with the surrounding side wall surface in the ventilation passage 81e in the cooling cover from the introduction communication port 81b, and after being cooled, the electrical component is again discharged from the discharge communication port 81c. Return to the storage box 80.

  With this configuration, the cooled circulating air that returns to the inside of the electrical component storage box 80 from the discharge communication port 81 c cools the electrical components stored in the electrical component storage box 80. The electrical components in the sealed electrical component storage box 80 are well cooled, and are not exposed to the atmospheric environment including dust that is used by the engine-driven work machine, so that the breakdown is reduced and all operations are performed. It can be used for the environment.

  FIG. 4 shows a view in which the electrical component storage box 80 is disposed in the casing 110 of the engine-driven work machine 100, which will be described in detail below. The casing 110 is a box in which an intake frame 111 having a cooling air intake port 111a at the left end in the drawing and a discharge frame 112 having an exhaust port 112a at the right end in the drawing are arranged on a base 120 which is a base frame. It has a shape.

  An engine 50 and a work machine main body 55 driven by the engine 50 are disposed inside the housing 110, and a cooling fan 51 necessary for operation, a radiator 52 as a heat exchanger, a fuel tank 57, and an operation required for operation. An electrical component storage box 80 or the like that stores electrical components for control is disposed.

  When the engine-driven work machine 100 is operated, the cooling fan 51 rotates to cool the equipment inside the casing 110, and the cooling air Q1 passes through the filter 115 for removing relatively large dust, dead leaves, and the like. Sucked into the housing.

  The cooling air Q2 sucked into the housing is sucked while cooling so as to wrap around the sealed electrical component storage box 80, and cools other equipment including the engine 50 disposed inside the housing 110, Further, after the radiator 52 is cooled, the air is exhausted to the outside through the exhaust port 112a as exhaust air Q4. A part of the cooling air sucked from the intake port 111a becomes the cooling air Q3, and cools the fuel tank 57 and then merges with the cooling air Q2.

  The electrical component storage box 80 is exposed to the flow as a horizontally long substantially rectangular parallelepiped extending long in the flow direction of the cooling air Q2. Further, in order to keep the flow rate of the cooling air sucked while cooling so as to wrap around the electrical component storage box 80 at a predetermined speed, the gap between the side wall surface of the electrical component storage box 80 and the inner wall surface of the housing 110 is It is formed in a predetermined dimension with a narrow width. Since the surface area in the direction in which the cooling air flows is increased by increasing the flow velocity of the cooling air, the heat dissipation amount of the electrical component storage box 80 is increased.

  FIG. 5 is a cross-sectional view showing another embodiment in which heat radiation fins are formed on the cooling cover of the electrical component storage box 86. The present embodiment is an embodiment in which a cooling fin 81 is added to the cooling cover 81 of the electrical component storage box 80 to further improve the cooling efficiency, which will be described in detail below.

  The electrical component storage box 86 is hermetically formed inside and outside, and a cooling cover 87 that can be attached and detached for maintenance and inspection of electrical components stored in the interior is disposed on the right side and the left side in the drawing. Another role of the cooling cover 87 is to absorb the heated internal air inside the electrical component storage box 86 by the cooling cover 87 and dissipate it to the outside of the electrical component storage box 86.

  The cooling cover 87 is formed of a flat base member 87a and a box-like lid member 87d that covers the outer side of the base member 87a so as to form an internal space. A plurality of 87 g were formed. The heat radiating fins 87g are formed as plate-shaped heat radiating fins 87g that extend horizontally in the flow direction of the cooling air so as to be parallel to the cooling air flowing so as to wrap the outside of the electrical component storage box 86 while being cooled. .

  The circulation fan 91, the introduction communication port 87b, the cooling cover air passage 87e, and the discharge communication port 87c are formed in the same configuration as that disclosed in the first embodiment. A plurality of radiating fins 87f are formed on the side wall surface of the lid member 87d in the cooling cover air passage 87e.

  The heat dissipating fins 87f are arranged in the form of an elongated plate in the vertical direction so that the circulating flow in the cooling cover air passage 87c follows the flow from the top to the bottom. One side surface thus fixed is fixed in contact with the inner wall surface of the lid member 87d.

  The upper end surface in the longitudinal direction of the plate-shaped heat radiation fin 87f starts at a position below the introduction communication port 87b, and the lower end surface is in contact with the bottom surface of the ventilation passage 87e in the cooling cover. Further, the width in the illustrated horizontal direction of the heat dissipating fins 87f is formed to be approximately ½ of the width dimension of the wall surface of the base member 87a and the wall surface of the lid member 87d that form both side wall surfaces of the cooling cover air passage 87e. .

  With this configuration, the heat exchange performance is improved by the plurality of heat dissipating fins 87f disposed in the cooling cover ventilation passage 87e, and the section between the plurality of parallel heat dissipating fins 87f in the cooling cover air passage 87e is provided for ventilation. Therefore, the deviation of the air flow rate can be reduced, and the average wind speed can be obtained to prevent the heat exchange performance from being lowered.

  FIG. 6 shows another embodiment in which the embodiment 2 disclosed in FIG. 5 is partially modified. The electrical component storage box 89 is hermetically formed inside and outside, and a detachable cooling cover 88 is provided on the right side and the left side in the drawing for maintenance and inspection inside. The role of the cooling cover 88 is that it can be attached and detached for maintenance and inspection of the electrical components stored in the electrical component storage box 89, and the temperature of the heated internal air in the electrical component storage box 89 is determined by the cooling cover 88. Cooling by endotherm is the same as in the other embodiments.

  Cooling covers 88 are disposed on the right and left sides, which are the outer peripheral surfaces of the electrical component storage box 89, so as to be airtight and detachable, and the cooling cover internal ventilation path 88e is provided on the inner surface of the cooling cover 88 with a flat base member 88a. And the cover member 88d, the configuration is the same as that of the invention disclosed in the second embodiment except that the cooling cover air passage 88e is inserted into the electrical component storage box 89.

  Since the lid member 88d forming the ventilation passage 88e in the cooling cover is inserted into the electrical component storage box 89, the space of the electrical component stored in the electrical component storage box 89 is reduced, or the cooling cover 88 is installed in the engine. Although the surface area exposed to the cooling air of the drive working machine 100 decreases with the flat plate-like base member 88a, the same effect can be obtained by increasing the number and surface area of the radiation fins 88g.

FIG. 1 is a sectional view showing the inside of an electrical component storage box according to an embodiment of the present invention. 2 is a front view of the electrical component storage box. 3 is a cross-sectional view of the inside of the electrical component storage box as viewed from the front. FIG. 4 shows an engine-driven working machine that houses an electrical component storage box. FIG. 5 is a sectional view showing the second embodiment. FIG. 6 is a sectional view showing Example 3. Fig. 7 shows a conventional example of cooling electrical components FIG. 8 shows another conventional example of cooling electrical components.

Explanation of symbols

DESCRIPTION OF SYMBOLS 50 Engine 51 Cooling fan 52 Radiator 55 Work machine main body 57 Fuel tank 70, 73 Electrical component 72 Control board 80 Electrical component storage box 80d Side plate 80e, 80f Opening part 81, 85, 87, 88 Cooling cover 81a, 85a, 87a, 88a Foundation member 81b, 85b, 87b, 88b Inlet communication port 81c, 85c, 87c, 88c Discharge communication port 81d, 85d, 87d, 88d Lid member 81e, 85e, 87e, 88e Cooling cover air passage 91 Circulating fan 100 Engine drive Work machine 110 Housing 111a Air intake port 112a Air exhaust port 115 Filter 120 Base Q1, Q2, Q3, Q4 Cooling air

Claims (7)

  At least an engine, a working machine body driven by the engine, and a cooling fan that sucks cooling air into the housing are disposed in the housing, and electrical components are housed in cooling air passages formed in the housing. An engine-driven work machine provided with an electrical component storage box, wherein the electrical component storage box has a hermetically sealed structure, and a cooling cover is screwed in an airtight state on at least one side wall of the electrical component storage box The cooling cover is formed of a flat base member and a cover member that is fixed to the base member and covers the base member so as to form an internal space, and is covered with the cover member of the base member. At least one introduction communication port for introducing the air inside the electrical component storage box into the internal space is formed at one end facing the interior side of the electrical component storage box in the internal space region. Internal space covered with the lid member on the same plane as the mouth At least one or more discharge communication ports are provided on the other end side located in the region to form a cooling cover internal ventilation path, which is formed between the electrical component storage box internal space and the cooling cover internal ventilation path. An electrical component storage box for an engine-driven work machine, characterized in that a circulation fan is disposed in an annular ventilation path.   2. The electrical component storage box for an engine-driven work machine according to claim 1, wherein the circulation fan is aligned with a central axis of each introduction communication port and blows air inside the electrical component storage box to the introduction communication port. An electrical component storage box for an engine-driven work machine, which is disposed immediately before.   3. An electrical component storage box for an engine-driven work machine according to claim 1, wherein the electrical component storage box is a substantially rectangular parallelepiped and is formed to be long in the horizontal direction with respect to the vertical and depth dimensions. An electrical component storage box for an engine-driven work machine, wherein the horizontal direction is arranged in a direction that coincides with a cooling air flow direction of a cooling air passage in the engine-driven work machine.   4. An electrical component storage box for an engine-driven work machine according to claim 1, wherein the electrical component storage box is made of a metal material having a high thermal conductivity. Electrical component storage box.   5. An electrical component storage box for an engine-driven work machine according to claim 1, wherein the electrical component storage box disposed in the cooling air passage in the casing encloses the electrical component storage box. An electrical component storage box for an engine-driven work machine, wherein at least one plate-like heat radiating fin extending parallel to a flow of flowing cooling air and extending in a flow direction is formed on an outer surface of the cooling cover.   3. An electric component storage box for an engine-driven work machine according to claim 1, further comprising a temperature detection means inside the electric component storage box, wherein the circulation fan is in accordance with an output of the temperature detection means. An electrical component storage box for an engine-driven work machine, characterized in that it has a circulation fan control means for performing a shutdown operation.   7. The electric component storage box for an engine-driven work machine according to claim 6, wherein the circulation fan control means controls the number of circulation fans operated by the temperature inside the electric component storage box. Electrical component storage box.

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