JP2021175308A - Power conversion device - Google Patents

Abstract

To provide a power conversion device that can prevent foreign substances such as rainwater and dust from entering a control box through a hood opening.SOLUTION: In the power conversion device, a control unit A includes drainage plates 12, 13, which prevent rainwater, etc., from entering hoods 4, 5, for intake and exhaust, and nets 10, 11 for preventing foreign substances from entering disposed on both hoods 4, 5. Rainwater that has entered beyond the drainage plates 12, 13 is discharged to the outside through cutouts formed in the drainage plates 12, 13. In addition, integrally forming gallery sheet metal parts 8, 9 on both hood inner side parts 4b, 5b prevents rainwater from leaking into a control box 1 from the inner side of the hoods 4b, 5b so as to reliably prevent internal equipment 6 in the control box 1 from malfunctioning even if rainwater penetrates to the inner side of the hoods 4b, 5b.SELECTED DRAWING: Figure 1

Description

The present invention relates to a structure improved so as to prevent rainwater or the like from entering the control box of the power conversion device from the intake port or the exhaust port.

A power conversion device such as a self-excited static VARCOM is equipped with an inverter, but the inverter generates a very large amount of power loss, which may cause heat generation and cause a failure or malfunction.

Therefore, an intake port and an exhaust port are formed on the side surface of the control box of the control unit constituting the power conversion device, and by rotating the cooling fan provided inside the control box, outside air is taken into the control box from the intake port and cooled. A method is adopted in which the inverter is forcibly air-cooled by a fan and then exhausted from the exhaust port to the outside of the case.

A hood is attached to each of such intake ports and exhaust ports so as to cover them, thereby preventing foreign substances such as rainwater and dust from entering the control box from the intake port and exhaust port. (See Non-Patent Document 1).

Aichi Electric Co., Ltd. Product Catalog "Static Com for High Voltage Distribution Compensator" Created in September 2019 [Search March 19, 2020] Internet <URL: http://www.aichidenki.jp/products/catalog_pdf /a2-statcom.pdf ＞

According to the power conversion device equipped with the hood described above, when rain or dust hits the hood from above or from the side as in normal rainy weather, the hood allows rain or dust to enter the control box. Although this is not the case, if the wind direction changes from moment to moment due to turbulent weather such as a typhoon, or if it is blown from below the hood, rain or dust may enter the inside of the control box through the opening at the bottom of the hood. It may cause equipment failure inside the control box.

Therefore, an object of the present invention is to provide a structure of a power conversion device capable of preventing foreign substances such as rainwater and dust from entering the control box through the opening of the hood.

The invention according to claim 1 comprises an intake hood that covers an intake port on the side surface of the case, and an exhaust hood that covers the exhaust port, and provides a drain plate that prevents water from entering through an opening on the outer bottom surface of the hood. It is characterized in that it is provided inside and a gallery sheet metal portion is attached to the inner end portion of the hood to be fitted in the control box.

The invention according to claim 2 is characterized in that a net is attached to the bottom surface of the outer portion of the hood according to claim 1.

The invention according to claim 3 is characterized in that the height position of the bottom surface of the outer side portion of the hood according to either claim 1 or 2 is set lower than the height position of the inner portion of the hood.

In the invention according to claim 4, the draining plate according to any one of claims 1 to 3 is placed in a hood so that one end (tip) is higher than the other end (base). It is characterized by being installed at an angle.

The invention according to claim 5 is characterized in that the draining plate according to any one of claims 1 to 4 is provided with a notch for draining water.

The invention according to claim 6 is characterized in that the notch for draining according to claim 5 is formed at a base end portion or a side end portion of the draining plate.

The invention according to claim 7 is characterized in that the inside end portion of the hood and the gallery sheet metal portion according to any one of claims 1 to 6 are caulked.

The invention according to claim 8 is characterized in that the inner end portion of the hood and the gallery sheet metal portion according to any one of claims 1 to 6 are integrally molded.

According to the invention of claim 1, the draining plate can prevent rain and dust that have entered the hood from entering the case, and even if it does enter the control box, the inside of the hood should be prevented. The gallery sheet metal part attached to the end can prevent rainwater and dust from getting on the equipment inside the control box.

According to the invention of claim 2, it is possible to reliably prevent foreign matter from entering the hood by the net.

According to the third aspect of the present invention, the rainwater that has penetrated to the inner side of the hood can be flowed to the outer side of the hood and satisfactorily discharged to the outside of the hood.

According to the invention of claim 4, since the draining plate is inclined and attached in the hood, rainwater adhering to the draining plate can flow to the lower part of the inclination and be satisfactorily discharged to the outside of the hood.

According to the fifth aspect of the present invention, even if rainwater or the like enters the hood beyond the draining plate, the rainwater can be discharged to the outside of the hood from the draining notch provided in the draining plate.

According to the invention of claim 6, since the notch for draining water is formed at the base end portion or the side end portion of the draining plate, rainwater or dust enters the hood or the case through the notch. While reducing the possibility, rainwater or the like that has entered beyond the draining plate can be discharged to the outside of the hood through the notch.

According to the invention of claim 7, by caulking between the inner end of the hood and the gallery sheet metal portion, it is possible to prevent rainwater or the like from leaking into the case between the two members.

According to the invention of claim 8, by integrally molding the inner end portion of the hood and the gallery sheet metal portion, it is possible to further prevent rainwater or the like from leaking between the two members.

It is a vertical sectional view of the main part which shows the internal structure of the control part which comprises the power conversion apparatus which concerns on this invention. It is sectional drawing which shows the hood of the control part constituting the power conversion apparatus of this invention from above. It is a cross-sectional view which shows the hood which concerns on other Examples of the control part constituting the power conversion apparatus of this invention from above. It is a vertical cross-sectional view which shows the hood of the control part which comprises the power conversion apparatus of this invention from the side. It is a vertical cross-sectional view which shows the hood which concerns on other embodiment of the control part constituting the power conversion apparatus of this invention from the side.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 4. In FIG. 1, reference numeral 1 denotes a control box (case) of a control unit A constituting the power conversion device according to the present invention, and the power conversion device includes a transformer unit (not shown) in addition to the control unit A. ..

In FIG. 1, 2 is an intake port formed on the side surface of the control box 1, and 3 is an exhaust port formed on the side surface of the control box 1. Reference numeral 4 denotes an intake hood attached to the control box 1 so as to cover the intake port 2, and is roughly composed of a hood outer portion 4a and a hood inner portion 4b.

Reference numeral 5 denotes an exhaust hood attached to the control box 1 so as to cover the exhaust port 3, and is roughly composed of a hood outer portion 5a and a hood inner portion 5b.

Reference numeral 6 denotes an internal device of the control unit A housed in the control box 1 between the intake port 2 and the exhaust port 3, and is forcibly air-cooled by the cooling fan 7. Reference numerals 8 and 9 are gallery sheet metal portions attached to the ends of the inner hood portions 4b and 5b.

In the hoods 4 and 5 according to the present invention, nets 10 and 11 are attached to the bottom surfaces of the hood outer portions 4a and 5a. Further, inside the outer hood portions 4a and 5a, draining plates 12 and 13 inclined upward at a predetermined angle are attached from the base end portion to the tip end portion.

According to the power conversion device configured in this way, when suppressing the heating of the internal device 6 in the control box 1, the cooling fan 7 is rotated to suck the outside air from the intake hood 4 into the control box 1. After the internal device 6 is forcibly air-cooled, the internal device 6 is exhausted from the exhaust port 3 to the outside of the control box 1 through the exhaust hood 5.

Further, in a turbulent weather such as a typhoon, foreign substances such as rainwater and dust try to enter the control box 1 from both the intake hood 4 and the exhaust hood 5, but these are attached to the hoods 4 and 5. It can be effectively suppressed from entering the control box 1 by being blocked by the nets 10 and 11 and the draining plates 12 and 13.

Further, since the draining plates 12 and 13 have a structure in which the draining plates 12 and 13 are inclined upward from the base end portion toward the tip portion, rainwater in contact with the draining plates 12 and 13 is provided with the base end along the inclination. It can flow down to the portion side and be discharged from the base end portion to the outside from the bottom surfaces of the hood outer portions 4a and 5a.

FIG. 2 is a cross-sectional view of the intake hood 4 or the exhaust hood 5. A notch 14 for draining is formed at the base end portion of the draining plates 12 and 13 mounted in the hoods 4 and 5.

Therefore, even if rainwater infiltrates beyond the draining plates 12 and 13, the rainwater flows down to the base ends of the draining plates 12 and 13 along the inclination of the draining plates 12 and 13, and the hood 4 passes through the notch 14. It is surely discharged to the outside.

In FIG. 2, since a gap 15 is formed between the left and right ends of the draining plates 12 and 13 and the inner surfaces of the hood outer portions 4a and 5a, rainwater that has entered beyond the draining plates 12 and 13 passes through the gap 15. It can also be discharged to the outside of the hoods 4 and 5.

However, by forming such a gap 15, there is a high possibility that rainwater will enter above the draining plates 12 and 13 through the gap 15, so that the left and right sides of the draining plates 12 and 13 shown in FIG. 2 are increased. A structure may be adopted in which a gap is not formed between the end portion and the inner side surfaces of the outer portions 4a and 5a of the hood.

FIG. 3 is a cross-sectional view showing another embodiment of the draining plates 12 and 13. In FIG. 3, as described above, no gap is formed between the left and right ends (side ends) of the draining plates 12 and 13 and the inner side surfaces of the hood outer portions 4a and 5a. However, a small notch 16 is formed in a part of the side end portion so that rainwater that has entered beyond the draining plates 12 and 13 can be discharged under the draining plates 12 and 13.

Further, by eliminating the notch 14 formed in FIG. 2 at the base end portions of the draining plates 12 and 13, it is possible to prevent rainwater from entering the draining plates 12 and 13 through the notch 14. doing.

FIG. 4 is a vertical cross-sectional view showing a state in which the gallery sheet metal portions 8 and 9 are attached to the ends of the hood inner portions 4b and 5b of the intake hood 4 and the exhaust hood 5. By attaching the gallery sheet metal portions 8 and 9 in this way, even if rainwater invades the inside of the hood inner portions 4a and 5a, the rainwater leaks into the control box 1 and causes the internal device 6 to malfunction. Can be blocked.

Further, by caulking between the ends of the hood inner portions 4b and 5b and the gallery sheet metal portions 8 and 9, leakage of rainwater into the control box 1 can be further suppressed, and both can be integrally molded. For example, the leakage of rainwater can be completely prevented.

FIG. 5 shows a case where the height position of the bottom surfaces of the hood outer portions 4a and 5a (around the mounting positions of the nets 10 and 11) is lower than the hood inner portions 4b and 5b.

With this configuration, even when rainwater that has entered from the outer hood outer portions 4a and 5a has entered the hood inner portions 4b and 5b beyond the draining plates 12 and 13, the rainwater inside the hood inner portions 4b and 5b Can be flowed to the hood outer portions 4a and 5a, and can be discharged from the hood outer portions 4a and 5a to the outside of the hood. At this time, if the bottom surfaces of the hood inner portions 4b and 5b are tilted so that the hood outer portions 4a and 5a are lower, the rainwater collected on the bottom surfaces of the hood inner portions 4b and 5b can be sent to the outside of the hoods 4 and 5. It becomes easier to discharge.

As described above, according to the power conversion device of the present invention, it is possible to prevent foreign matter such as rainwater and dust from entering the control box 1 from the hoods 4 and 5, and the power conversion device exceeds the draining plates 12 and 13. Even if rainwater invades, it can be satisfactorily discharged to the outside of the hoods 4 and 5.

Further, even when rainwater invades the inner portions 4b and 5b of the hood, it is possible to prevent the rainwater from leaking to the control box 1 from here, and it is possible to surely prevent the internal equipment of the control box 1 from breaking down or causing a malfunction.

The present invention can be applied to various electric devices including an intake hood and an exhaust hood that cover an intake port and an exhaust port formed for air-cooling an internal device.

1 Control box 2 Intake port 3 Exhaust port 4 Intake hood 4a, 5a Hood outer part 4b, 5b Hood inner part 5 Exhaust hood 6 Internal equipment 7 Cooling fan 8,9 Gallery sheet metal part 10,11 Net 12,13 Drain plate 14, 16 Notch 15 Gap A Control unit

Claims (8)

An intake hood that covers the intake port on the side surface of the case and an exhaust hood that covers the exhaust port are provided, and a drain plate that prevents water from entering from the opening on the bottom surface of the outer side of the hood is provided in the hood. A power conversion device characterized in that a gallery sheet metal portion is attached to an inner end portion of the hood to be fitted into the hood. The power conversion device according to claim 1, wherein a net is attached to the bottom surface of the outer side of the hood. The power conversion device according to claim 1 or 2, wherein the height position of the bottom surface of the outer surface of the hood is lower than the height position of the inner surface of the hood. The draining plate according to claim 1 to 3, wherein the draining plate is installed in the hood at an angle so that one end (tip) is higher than the other end (base). The power conversion device according to any one. The power conversion device according to any one of claims 1 to 4, wherein the draining plate is provided with a notch for draining water. The power conversion device according to claim 5, wherein the notch for draining is formed at the lower end portion of the draining plate or the side end portion of the draining plate. The power conversion device according to any one of claims 1 to 6, wherein the hood inner end portion and the gallery sheet metal portion are caulked. The power conversion device according to any one of claims 1 to 6, wherein the inner end portion of the hood and the gallery sheet metal portion are integrally molded.

Images