Dust-proof method and dust-proof structure for electric box of sound-proof work machine

Abstract

To prevent dust from entering an electric box provided in a sound-proof box of a sound-proof work machine.SOLUTION: A sound-proof work machine 1 which houses an electric box 70 housing an electric apparatus among constituent apparatuses in a space in a sound-proof box 10 is provided with air introduction means 80 which introduces air passed through a dust-proof filter (not illustrated) to remove dust into the electric box 70 through an air guide port provided to the electric box 70 during the operation of a cooling fan 40. In the illustrated example, the cooling fan 40 is arranged in a duct 50 provided in the sound-proof box 10, and a branch dust 81 which introduces a part of the cooling air in a secondary-side duct 50 of the cooling fan 40 into the electric box 70 is provided as the air introduction means 80 to produce pressure (positive pressure) equal to or higher than the atmospheric pressure in the electric box 70 and also discharge the introduced air through an opening (for example, a wiring lead-in port 73) other than the air guide port 74, thereby preventing foreign matter such as powder dust from entering the electric box 70.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a dustproof method and a dustproof structure for an electric box in a soundproof work machine. More specifically, in a soundproof work machine in which constituent devices of the work machine are housed in a soundproof box and packaged, and an electric box, which is a container for housing electric devices among the constituent devices, is arranged in the soundproof box, the present invention relates to a dustproof method and a dustproof structure for preventing foreign matters such as dust from entering the electric box.

Background Art

[0002] In work machines such as air compressors, in order to suppress the leakage of noise to the outside of the machine and improve the quietness during operation, the work machine body such as the compressor body, the drive source such as the electric motor for driving the work machine body, and other constituent devices are generally housed in a soundproof box and packaged to form a soundproof work machine.

[0003] In such a soundproof work machine in which the constituent devices are housed in a soundproof box and packaged, although the quietness during operation is improved, the heat generated from the constituent devices housed in the soundproof box is likely to be trapped in the soundproof box, making it difficult to cool the constituent devices.

[0004] Therefore, in a soundproof work machine, an air inlet for introducing outside air as cooling air into the soundproof box and an exhaust port for discharging the cooling air that has passed through the soundproof box to the outside of the soundproof box are provided on the wall surface of the soundproof box, respectively, and a cooling fan is provided to generate a flow of cooling air from the air inlet to the exhaust port in the soundproof box so that the constituent devices housed in the soundproof box can be cooled.

[0005] In particular, when such a working machine is, for example, an air compressor, not only is the compressor body, which is the main body of the working machine, and an electric motor, which is a drive source for driving the compressor body, etc. housed in the soundproof box, but also an oil cooler for cooling the lubricating oil used for lubrication, cooling, and sealing of the compression working space, and a heat exchanger such as an aftercooler for cooling the generated compressed gas before supplying it to the consumption side are housed. In such a case, it is necessary to introduce a large amount of cooling air to these heat exchangers.

[0006] Therefore, in the soundproof working machine 100 that needs to introduce and discharge such a large amount of cooling air, as an example, as shown in FIGS. 5 and 6, a large exhaust port 114 is provided in the top panel 112a of the soundproof box 110 that is easy to secure a large area, and a large cooling fan 140 is housed inside the soundproof box 110 near the exhaust port 114 to discharge a large amount of air inside the soundproof box 110 outward from the exhaust port 114, so that a large amount of cooling air can be introduced into the soundproof box 110 to efficiently cool the component devices (see FIG. 3 of Patent Document 1 and FIG. 2 of Patent Document 2).

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0008] Taking as an example the case where the soundproof work machine 100 is a motor-driven compressor, the soundproof box 110 of this soundproof compressor houses the compressor body 120 which is the work machine body, the electric motor 130 which is the drive source, a heat exchanger 160 such as an oil cooler and an aftercooler (see FIG. 6), and in addition to the cooling fan 140 that generates cooling air, an electric box 170 (see FIG. 5) for housing electrical equipment is further arranged. In this electric box 170, a starting board provided with equipment (switching elements, star-delta circuits, inverter circuits, etc.) necessary for starting the electric motor 130, a control board with a control device attached for controlling the operation of component devices such as the fan motor, and a configuration for housing other electrical equipment are adopted.

[0009] Since this electric box 170 is configured as a box-shaped container with a lid, the internal space of the electric box 170 is a space partitioned from the internal space of the soundproof box 110. Therefore, even when dust enters the soundproof box 110 from outside together with the cooling air through the intake port 113, it is difficult for the dust that has entered the soundproof box 110 to further enter the electric box 170.

[0010] However, when the cooling fan 140 housed in the soundproof box 110 is rotated to generate cooling air, the pressure on the primary side of the cooling fan 140 becomes less than atmospheric pressure (hereinafter, in this specification, the pressure less than atmospheric pressure is referred to as "negative pressure"). Therefore, as shown in FIG. 5, in a configuration where a large cooling fan 140 is provided in the soundproof box 110 near the exhaust port 114 provided on the top panel 112a of the soundproof box 110, when the cooling fan 140 is operated, almost the entire interior of the soundproof box 110 becomes negative pressure.

[0011] Therefore, due to the negative pressure generated in the soundproof box 110, the air in the electric box 170 is sucked out through the gaps existing at the joints between the main body and the lid of the electric box 170, causing the space in the electric box 170 to also become negative pressure.

[0012] This electric box 170 is provided with a wiring inlet (not shown) for drawing in wiring from an external power source such as a commercial power source. Since the space inside the electric box 170 communicates with the outside of the soundproof box through this wiring inlet, when the inside of the electric box 170 becomes negative pressure as described above, foreign matters such as dust are sucked into the electric box 170 together with the air outside the soundproof box through the opening communicating with the outside of the soundproof box such as this wiring inlet. If the dust etc. sucked into the electric box 170 in this way adheres to the electrical equipment housed inside, it may cause malfunction or failure of the electrical equipment.

[0013] Therefore, it is necessary to take dust prevention measures for the electric box 170 housed inside the soundproof box 110 of the soundproof working machine 100.

[0014] Therefore, the present invention has been made to solve the drawbacks in the above prior art, and even when the inside of the soundproof box becomes negative pressure due to the operation of the cooling fan with a relatively simple configuration, it is possible to prevent foreign matters such as dust from entering the electric box housed inside the soundproof box. An object of the present invention is to provide a dust prevention method and a dust prevention structure for an electric box in a soundproof working machine.

Means for Solving the Problems

[0015] Hereinafter, the means for solving the problems will be described together with the reference numerals used in the mode for carrying out the invention. This reference numeral is for clarifying the correspondence between the description of the claims and the description of the mode for carrying out the invention, and needless to say, it is not used restrictively for interpreting the technical scope of the present invention.

[0016] In order to achieve the above object, the dust prevention method for the electric box 70 in the soundproof working machine 1 of the present invention is The soundproof working machine 1 houses component devices including a working machine in a soundproof box 10, and the wall surface of the soundproof box 10 is provided with an air inlet 13 for introducing cooling air into the soundproof box and an exhaust port 14 for discharging the cooling air outside the soundproof box, and is also provided with a cooling fan 40 for generating a flow of the cooling air from the air inlet 13 toward the exhaust port 14 in the soundproof box 10. Among the spaces in the soundproof box 10, for example, in a portion where the pressure becomes less than atmospheric pressure (referred to as "negative pressure" in this specification) due to the operation of the cooling fan 40, an electric box 70 for housing an electric device among the component devices is arranged. During the operation of the cooling fan 40, air that has been dust-removed by passing through a dust-proof filter (not shown) is introduced into the electric box 70 through an air guide port 74 provided in the electric box 70, so that the pressure inside the electric box 70 becomes a pressure equal to or higher than atmospheric pressure (referred to as "positive pressure" in this specification). After passing through the electric box 70, the air is discharged through openings other than the air guide port 74 provided in the electric box 70 (for example, a wiring inlet 73 or a gap between the electric box body 71 and the lid 72) (Claim 1).

[0017] In the dust-proof method having the above configuration, by providing the dust-proof filter (not shown) at the air inlet 13, the dust-removed cooling air is introduced into the soundproof box 10, and the cooling air in the soundproof box 10 may be introduced into the electric box 70 as the dust-removed air through the air guide port 74 (Claim 2).

[0018] In a configuration where the cooling fan 40 is arranged in a duct 50 provided in the soundproof box 10, a part of the cooling air in the duct 50 on the secondary side of the cooling fan 40 may be introduced into the electric box 70 through the air guide port 74 to make the pressure inside the electric box 70 positive pressure (Claim 3).

[0019] In this case, further, a part of the cooling air in the duct 50 on the secondary side of the cooling fan 40 may be dust-removed and then introduced into the electric box 70 through the air guide port 74 (Claim 4).

[0020] Incidentally, it is preferable that the opening for discharging the air introduced into the electric box 70 is a wiring inlet 73 communicating with the outside of the soundproof box 10 (Claims 5 and 6).

[0021] Also, the dustproof structure of the electric box 70 in the soundproof work machine of the present invention is as follows. A configuration device including a work machine is housed in the soundproof box 10, and an intake port 13 for introducing cooling air into the soundproof box 10 and an exhaust port 14 for discharging the cooling air to the outside of the soundproof box 10 are provided on the wall surface of the soundproof box 10, respectively. A cooling fan 40 for generating a flow of cooling air from the intake port 13 toward the exhaust port 14 is provided in the soundproof box 10. Among the spaces in the soundproof box 10, for example, in a portion where the pressure becomes less than atmospheric pressure (negative pressure) due to the operation of the cooling fan 40, an electric box 70 for housing an electric device among the configuration devices is arranged. In the soundproof work machine 1, During the operation of the cooling fan 40, air that has been dust-removed by passing through a dustproof filter (not shown) is introduced into the electric box 70 through an air guiding port 74 provided in the electric box 70, and the pressure inside the electric box 70 is set to a pressure equal to or higher than atmospheric pressure (positive pressure). After the air passes through the electric box 70, air introducing means 80 (81, 82) for discharging the air through an opening other than the air guiding port 74 provided in the electric box 70 (for example, a wiring inlet 73 or a gap between the main body 71 and the lid 72 of the electric box 70) is provided (Claim 7).

[0022] In the dustproof structure having the above configuration, by providing the dustproof filter (not shown) at the intake port 13, the cooled air that has been dust-removed is introduced into the soundproof box 10, and the air introducing means 80 (81, 82) may be configured to introduce the cooled air in the soundproof box 10 into the electric box 70 through the air guiding port 74 as the dust-removed air (Claim 8).

[0023] Furthermore, in the configuration where the cooling fan 40 is disposed in the duct 50 provided in the soundproof box 10, a branch duct 81 that communicates the duct 50 on the secondary side of the cooling fan 40 with the air guide port 74 of the electric box 70 may be provided, and the branch duct 81 may be used as the air introduction means 80 (Claim 9).

[0024] In this case, a dustproof filter (not shown) may be provided at any one or more of the primary side, secondary side, and inside of the branch duct 81 (Claim 10).

[0025] Note that it is preferable that openings other than the air guide port 74 through which the air introduced into the electric box 70 is discharged are wiring lead-in ports 73 that communicate with the outside of the soundproof box 10 (Claims 11 and 12).

Advantages of the Invention

[0026] With the configuration of the present invention described above, the soundproof work machine 1 having the dustproof structure of the electric box 70 of the present invention has achieved the following remarkable effects.

[0027] During the operation of the cooling fan 40, air that has been dust-removed by passing through a dustproof filter (not shown) is introduced into the electric box 70, and the pressure inside the electric box 70 is set to a pressure equal to or higher than atmospheric pressure (positive pressure). As a result, after the air passes through the inside of the electric box 70, the air is discharged through openings other than the air guide port provided in the electric box 70 (for example, the wiring lead-in port 73 and the gap between the electric box main body 71 and the lid 72). Since the air introduction means 80 (81, 82) is provided, even if the inside of the soundproof box 10 becomes negative pressure due to the operation of the cooling fan 40, the inside of the electric box 70 can be set to positive pressure by introducing clean air that has been dust-removed. As a result, it has been possible to prevent foreign substances such as dust from entering the electric box 70 together with outside air through openings that communicate with the outside of the soundproof box, such as the wiring lead-in port 73.

[0028] Moreover, during the operation of the cooling fan 40, air can be continuously introduced into the electric box 70. By replacing the air inside the electric box 70, it was also possible to cool the electrical equipment housed inside the electric box 70.

[0029] In the configuration where a dust filter (not shown) is provided at the air intake 13 provided on the soundproof box 10, it is possible to prevent foreign matters such as dust from adhering to the component devices housed inside the soundproof box 10. In addition, by introducing the cooling air that has passed through the dust filter and entered the soundproof box 10 into the electric box 70, it was possible to easily obtain dust-removed air introduced into the electric box 70.

[0030] The above-described air introduction means 80 may be configured, for example, as shown in the modification in FIG. 2, by providing an air duct 74' communicating with the space inside the soundproof box 10 on the wall surface of the electric box 70 and by providing a blower fan 82 attached to this air duct 74'. The configuration is not particularly limited as long as it can introduce dust-removed air into the electric box 70. However, by arranging the cooling fan 40 inside the duct 50 provided in the soundproof box 10 and providing a branch duct 81 that communicates the duct 50 on the secondary side of the cooling fan 40 with the space inside the electric box 70, and using this branch duct 81 as the air introduction means 80, by introducing the cooling air in the duct 50 on the secondary side of the cooling fan 40, which is at positive pressure, into the electric box 70, it is not necessary to additionally provide members such as a blower fan 82 for introducing air into the electric box 70 separately from the cooling fan 40.

[0031] Moreover, when a separate blower fan 82 is provided to introduce air into the electric box 70, if the blower fan 82 stops due to a failure or the like, the dust-proof property of the electric box 70 will be lost. However, in the configuration where the branch duct 81 is provided as described above to introduce the cooling air on the secondary side of the cooling fan 40 into the electric box 70, since air is always introduced into the electric box 70 during the operation of the cooling fan 40, it is possible to achieve a structure in which the dust-proof property is hardly lost due to a failure or the like.

[0032] In addition, in the configuration in which a dust-proof filter (not shown) is provided in at least one of the primary side, the secondary side of the branch duct 81, and the branch duct 70, even when air containing dust or the like is introduced into the soundproof box 10 as cooling air, the dust removal of the air introduced into the electric box 70 can be surely performed.

Brief Description of the Drawings

[0033]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0034] Hereinafter, with reference to the accompanying drawings, the configuration of the soundproof working machine equipped with the dust-proof structure of the electric box of the present invention will be described.

[0035] In the following description, as an example of the dust-proof structure of the present invention, the case where it is applied to a motor-driven soundproof compressor will be described as an example. However, the soundproof working machine to which the dust-proof structure of the present invention is applied is a soundproof working machine that adopts a configuration in which a space with negative pressure is generated in the soundproof box by operating the cooling fan, and an electric box is arranged in such a space with negative pressure. Regardless of the type of the working machine body, the type of the drive source, etc., it is applicable to various soundproof working machines and is not limited to the illustrated configuration.

[0036] Reference numeral 1 in FIGS. 1 to 4 indicates a soundproof compressor having a dustproof structure for an electric box according to the present invention.

[0037] This soundproof compressor 1 is a packaged unit in which component devices such as a compressor main body 20 that is a work machine main body and an electric motor 30 that is a drive source for driving the compressor main body 20 are housed in a soundproof box 10. By doing so, it is configured to suppress the leakage of noise such as operating sounds generated by the component devices housed in the soundproof box 10 and improve the quietness during operation.

[0038] The aforementioned soundproof box 10 that houses the component devices of the soundproof compressor 1 is composed of a rectangular base 11 in plan view on which the electric motor 30, the compressor main body 20, and other component devices are placed, and a soundproof case 12 that covers the base 11 with the component devices placed thereon.

[0039] Among these, the soundproof case 12 is a box-shaped case composed of a front panel 12a (see FIGS. 1 and 4(B)), a rear panel 12b (see FIG. 4(B)), side panels 12c and 12d, and a top panel 12e. By placing the soundproof case 12 on the base 11, it is configured to be able to house the component devices placed on the base 11 inside the soundproof case 10.

[0040] An air intake port 13 for introducing air outside the soundproof box 10 into the soundproof box 10 as cooling air is provided on the wall surface of the soundproof case 12, and an exhaust port 14 for discharging the cooling air after cooling the inside of the soundproof box 10 to the outside of the soundproof box 10 is provided.

[0041] A dustproof filter (not shown) is attached to the air intake port 13 among these to make the air introduced into the soundproof box 10 as cooling air clean air by removing dust.

[0042] In the illustrated embodiment, a plurality of air inlets 13 for introducing the air outside the soundproof box into the soundproof box 10 as cooling air are formed at a plurality of locations on the side panels 12c and 12d of the soundproof case 12, and an exhaust port 14 for discharging the cooling air after cooling the inside of the soundproof box 10 to the outside of the soundproof box is provided in the top panel 12e.

[0043] Furthermore, a cooling fan 40 (see FIG. 4) is provided inside the soundproof box 10, and the soundproof box 10 is configured such that a flow of cooling air from the aforementioned air inlet 13 toward the exhaust port 14 is generated inside the soundproof box 10.

[0044] In order to generate such a flow of cooling air, in the soundproof working machine 1 of the present embodiment, a duct 50 is provided inside the soundproof box 10, and the cooling fan 40 is disposed inside this duct 50. By rotating the cooling fan 40 disposed inside the duct 50, the cooling air introduced into the soundproof box 10 through the air inlet 13 passes through the duct 50 and is then discharged to the outside of the soundproof box through the exhaust port 14.

[0045] As such a duct 50, in the illustrated embodiment, as shown in FIGS. 2, 3, and 4(A), a vertical portion 51 erected so as to divide the space inside the soundproof box 10 into left and right in the paper plane at an intermediate position between the two side panels 12c and 12d, and a horizontal portion 52 extending horizontally from the upper end of the vertical portion 51 toward the side panel 12d side are provided. An L-shaped duct 50 having the vertical portion 51 and the horizontal portion 52 is provided. A cooling fan 40, which is a sirocco fan, is accommodated near the lower end inside the vertical portion 51 of this duct 50, and an air guide port 53 (see FIG. 4(A)) is provided in the side wall of the duct 50 at the accommodation position of the sirocco fan. The air inside the soundproof box 10 can be inhaled into the duct 50 through the air guide port 53.

[0046] Then, by arranging a heat exchanger 60 such as an oil cooler or an aftercooler on the horizontal portion 52 of the duct 50 and positioning it below the exhaust port 14, when the cooling fan 40 is rotated, the air in the soundproof box 10 sucked into the duct 50 through the air guide port 53 flows upward through the vertical portion 51 of the duct 50 and reaches the horizontal portion 52. After passing through the heat exchanger 60 from the horizontal portion 52, it is configured to be discharged outside the soundproof box through the exhaust port 14.

[0047] In this way, when the cooling fan 40 is rotated, the air in the soundproof box 10 is sucked into the duct 50 through the air guide port 53 and discharged outside the soundproof box through the exhaust port 14. As a result, the space in the soundproof box 10 becomes a negative pressure, so the air outside the soundproof box is introduced into the soundproof box 10 as cooling air through the intake ports 13 provided in the side panels 12c and 12d.

[0048] Thereby, a flow of cooling air from the intake port 13 through the duct 50 toward the exhaust port 14 as shown by the arrow in FIG. 4(A) is generated in the soundproof box 10.

[0049] This cooling air cools the compressor body 20, the electric motor 30, the fan motor 41 of the cooling fan 40, etc. in the process from the intake port 13 to the air guide port 53 of the duct 50, and is configured to be able to cool the heat exchanger 60 by the cooling air from the horizontal portion 52 of the duct 50 toward the exhaust port 14.

[0050] In this way, in the space of the soundproof box 10 that becomes a negative pressure due to the rotation of the cooling fan 40, a starting board equipped with a starting device used for starting the electric motor 30, a control board for controlling the operation of component devices such as the fan motor 41, and an electric box 70 which is a box-shaped container for housing other electrical equipment are housed.

[0051] In the illustrated embodiment, this electric box 70 is provided in the soundproof box 10 at a position facing the front panel 12a, and thus it is configured to be able to access the electric box 70 by removing the front panel 12a.

[0052] This electrical box 70 is composed of an electrical box body 71 and a lid 72 (see Fig. 2). By removing the lid 72 of the electrical box 70, access can be made to the starting board, control board housed inside, and various electrical components attached thereto (see Fig. 3).

[0053] This electrical box 70 is provided with a wiring inlet 73 for drawing in wiring from an external power source (e.g., commercial power supply). Through this wiring inlet 73, the space inside the electrical box 70 communicates with the outside of the soundproof box.

[0054] In the embodiment shown in Figs. 3 and 4, a wiring inlet 73 is provided at the bottom of the electrical box 70, which penetrates the base 11 of the soundproof box 10 and extends to the bottom surface of the soundproof box 10. Through this wiring inlet 73, a power lead-in wire from an external power source (e.g., commercial power supply) not shown in the figure can be drawn into the electrical box 70.

[0055] In the configuration of the soundproof compressor 1 configured as described above, if no measures are taken, when the space inside the soundproof box 10 becomes negative pressure by operating the cooling fan 40, the air inside the electrical box 70 is sucked into the space inside the soundproof box 10 where the air has become negative pressure through the gap between the electrical box body 71 and the lid 72, etc., causing the inside of the electrical box 70 to also become negative pressure. Foreign substances such as dust enter the electrical box 70 together with the air outside the soundproof box through the space communicating with the outside of the soundproof box such as the wiring inlet 73.

[0056] Therefore, in the present invention, in order to prevent the intrusion of foreign substances such as dust generated by the inside of the electrical box 70 becoming negative pressure, and to cool the electrical equipment inside the electrical box 70, an air introduction means 80 is provided to introduce air dust-removed through a dust filter (not shown) into the electrical box 70, so that during the operation of the cooling fan 40, the inside of the electrical box 70 is at a pressure equal to or higher than atmospheric pressure (positive pressure).

[0057] In this embodiment, as such air introduction means 80, a branch duct 81 branched from the duct 50 is provided on the secondary side of the cooling fan 40, and this branch duct 81 is communicated with the space inside the electric box 70 through an air duct opening 74 formed in the side wall of the electric box 70.

[0058] By providing the branch duct 81 in this way, the cooling air in the duct 50 on the secondary side of the cooling fan 40, which is at a positive pressure during the operation of the cooling fan 40, can be introduced into the electric box 70, and by making the pressure inside the electric box 70 a positive pressure, it is possible to prevent foreign matters such as dust from entering the electric box 70 together with the air outside the soundproof box.

[0059] Moreover, the air introduced into the electric box 70 is discharged to the outside of the electric box 70 through openings other than the air duct opening 74 provided in the electric box 70, such as the wiring inlet 73 and the gap between the electric box main body 71 and the lid body 72, and the air inside the electric box 70 is constantly replaced, so that the cooling of the electrical equipment and electrical components housed in the electric box 70 can also be suitably performed.

[0060] Here, in the configuration of this embodiment in which a dust filter (not shown) is provided at the air inlets 13 provided in the side panels 12c and 12d of the soundproof box 10, the air inhaled as cooling air into the soundproof box 10 through the air inlets 13 is clean air that has been dust-removed. Therefore, by introducing the cooling air in the soundproof box 10 into the electric box 70, it is possible to introduce dust-removed air into the electric box 70.

[0061] In this embodiment, further, a dust filter (not shown) is provided in at least one of the primary side, the secondary side, and inside the branch duct 81 of the above-described branch duct 81, and is configured to introduce the air in the soundproof box 10 into the electric box 70 after dust-removing, so that it is possible to more reliably prevent foreign matters such as dust from entering the electric box 70.

[0062] However, in the configuration where a dust filter (not shown) is provided in the branch duct 81, it is also possible to omit the attachment of the dust filter to the air inlet 13. Also, when attaching the dust filter to the air inlet 13, it is also possible to omit the attachment of the dust filter to the branch duct 81.

[0063] Note that in the illustrated embodiment, as the configuration of the air introduction means 80 for introducing air into the electric box 70, the configuration of providing a branch duct 81 that communicates the space in the duct 50 on the secondary side of the cooling fan 40 and the air guide port 74 provided in the electric box 70 has been described. However, the configuration of the air introduction means 80 can adopt various configurations as long as it can introduce the dust-removed air into the electric box 70 to make the inside of the electric box 70 positive pressure while the space in the dust-proof box 10 is negative pressure due to the operation of the cooling fan 40, and is not limited to the illustrated embodiment.

[0064] As an example of such air introduction means 80, instead of the configuration of providing the above-described branch duct 81, as shown as a modification example in FIG. 2, an air guide port 74' that communicates the space in the electric box 70 with the space in the dust-proof box 10 is provided on the wall surface of the electric box 70 (near the upper end of the side wall surrounded by a circle in the illustrated example), and a blower fan 82 provided separately from the cooling fan 40 is attached to the air guide port 74' outside or inside the electric box 70 (outside in the illustrated example), so that the blower fan 82 can be used as the air introduction means 80 to introduce the air in the dust-proof box 10 into the electric box 70.

[0065] In this case, a configuration of attaching a dust filter (not shown) to the air inlets 13 provided in the side panels 12c and 12d of the dust-proof box 10, and / or instead of this configuration, a dust filter (not shown) is provided on the primary side or secondary side of the blower fan 82, so that the air in the dust-proof box 10 can be dust-removed and then introduced into the electric box 70.

[0066] However, in a configuration where a blower fan 82 for introducing air into the electric box 70 is provided separately from the cooling fan 40, not only does the number of components increase, but it is also necessary to provide wiring work for the blower fan 82 and a control device for operating the blower fan 82 in conjunction with the cooling fan 40. This increases the manufacturing cost of the soundproof work machine 1. In addition, if the blower fan 82 stops operating due to a failure of the blower fan 82 or a disconnection of the wiring, the dustproofing of the electric box 70 will not be performed, and there is a risk that foreign substances such as dust will enter.

[0067] On the other hand, in the configuration in which the branch duct 81 described above is used as the air introduction means 80, new wiring work and the like are unnecessary, and dustproofing of the electric box 70 can be performed simply by adding an extremely simple structure. Moreover, during the operation of the cooling fan 40, air can always be introduced into the electric box 70, eliminating the concern about malfunction due to failure or the like as in the case of separately providing a blower fan 82 as the air introduction means 80, and a highly reliable dustproof structure can be achieved.

Explanation of Signs

[0068] 1,100 Soundproof work machine (soundproof compressor) 10,110 Soundproof box 11 Base 12 Soundproof case 12a Front panel 12b Rear panel 12c,12d Side panels 12e,112a Top panels 13,113 Air intake 14,114 Exhaust port 20,120 Compressor body (work machine body) 30,130 Electric motor (drive source) 40,140 Cooling fan 41 Fan motor 50 Duct 51 Vertical part (of the duct) 52 Horizontal part (of the duct) 53 Air guide port 60,160 Heat exchanger 70,170 Electric box 71 Body (of the electric box) 72 Lid (of the electric box) 73 Wiring inlet 74,74’ Air vent 80 Air introduction means 81 Branch duct 82 Blower fan

Claims

1. A soundproof working machine that houses component devices including a working machine in a soundproof box, and has an air intake for introducing cooling air into the soundproof box and an exhaust port for discharging the cooling air outside the soundproof box on the wall surface of the soundproof box, and includes a cooling fan for generating a flow of the cooling air from the air intake toward the exhaust port in the soundproof box, and an electric box for housing an electric device among the component devices in the soundproof box, wherein during operation of the cooling fan, air that has been dust-removed by passing through a dust filter is introduced into the electric box through an air guiding port provided in the electric box, and the pressure inside the electric box is set to a pressure equal to or higher than atmospheric pressure, so that the air passes through the inside of the electric box and is then discharged from an opening other than the air guiding port provided in the electric box. A dustproof method for an electric box in a soundproof working machine, characterized by this.

2. By providing the dust filter at the air intake, the dust-removed cooling air is introduced into the soundproof box, and the cooling air in the soundproof box is introduced into the electric box through the air guiding port as the dust-removed air. A dustproof method for an electric box in a soundproof working machine according to Claim 1, characterized by this.

3. The cooling fan is arranged in a duct provided in the soundproof box, and a part of the cooling air in the duct on the secondary side of the cooling fan is introduced into the electric box through the air guiding port. A dustproof method for an electric box in a soundproof working machine according to Claim 1 or 2, characterized by this.

4. A part of the cooling air in the duct on the secondary side of the cooling fan is dust-removed and then introduced into the electric box through the air guiding port. A dustproof method for an electric box in a soundproof working machine according to Claim 3, characterized by this.

5. The opening other than the air guiding port is a wiring inlet communicating with the outside of the soundproof box. A dustproof method for an electric box in a soundproof working machine according to Claim 1, 2, or 4, characterized by this.

6. The opening other than the air guiding port is a wiring inlet communicating with the outside of the soundproof box. A dustproof method for an electric box in a soundproof working machine according to Claim 3, characterized by this.

7. A soundproof working machine that houses component devices including a working machine inside a soundproof box, and has an air intake for introducing cooling air into the soundproof box and an exhaust port for discharging the cooling air outside the soundproof box on the wall surface of the soundproof box, and further includes a cooling fan for generating a flow of cooling air from the air intake toward the exhaust port inside the soundproof box, and an electric box for housing an electric device among the component devices is arranged inside the soundproof box. During operation of the cooling fan, air that has been dust-removed by passing through the dust filter is introduced through an air guide port provided in the electric box to make the pressure inside the electric box a pressure equal to or higher than atmospheric pressure, and air introduction means is provided to discharge the air through an opening other than the air guide port provided in the electric box after passing through the inside of the electric box. A dustproof structure of an electric box in a soundproof working machine, characterized in that it is provided.

8. By providing the dust filter at the air intake, the dust-removed cooling air is introduced into the soundproof box, and the air introduction means introduces the cooling air inside the soundproof box into the electric box through the air guide port as the dust-removed air. A dustproof structure of an electric box in a soundproof working machine according to claim 7, characterized in that it is provided.

9. The cooling fan is arranged in a duct provided inside the soundproof box, and a branch duct that communicates the duct on the secondary side of the cooling fan and the air guide port of the electric box is provided, and the branch duct is used as the air introduction means. A dustproof structure of an electric box in a soundproof working machine according to claim 7 or 8, characterized in that it is provided.

10. A dustproof filter is provided at any one or more of the primary side, secondary side, and inside the branch duct of the branch duct. A dustproof structure of an electric box in a soundproof working machine according to claim 9, characterized in that it is provided.

11. The opening other than the air guide port is a wiring lead-in port that communicates with the outside of the soundproof box. A dustproof structure of an electric box in a soundproof working machine according to claim 6, 7, or 9, characterized in that it is provided.

12. The opening other than the air guide port is a wiring lead-in port that communicates with the outside of the soundproof box. A dustproof structure of an electric box in a soundproof working machine according to claim 8, characterized in that it is provided.

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