Waterproof cover and inverter device

Abstract

The drip-proof cover (2) is Equipped with a main body case having heat generating components inside The drip-proof cover (2) protects an inverter unit (110) having a heat sink on the back surface of an inverter body (1). The drip-proof cover (2) is provided as a separate body that is detachable from the inverter unit (110) and covers the top, side and front surfaces of the inverter unit (110). The drip-proof cover (2) is side A first gap is provided from the inverter unit (110) side Cover side Department( 2b ) and the inverter unit (110) Top A second gap is provided from the inverter unit (110). Top Cover Top Department( 2a ) and a cover front portion covering the front of the inverter unit (110) (2c) The cover top surface portion (2a) has an air vent (21) formed at a position corresponding to the heat sink when the cover top surface portion (2a) covers the top surface of the inverter unit (110).

Description

[Technical field]

[0001] The present disclosure relates to a drip-proof cover for an inverter device that dissipates heat generated by a heating element using a heat sink provided on the rear surface of the main body, and the inverter device. [Background technology]

[0002] An inverter unit is a device that converts the frequency and current value of an input current and outputs it. During power conversion, power loss occurs internally and heat is generated. The inverter unit includes multiple components such as semiconductor elements and electronic components. If the temperature of a component exceeds the heat resistance temperature of the component during power conversion, the component will be damaged. If a component is damaged, the power conversion function of the inverter unit will be impaired. For this reason, the inverter unit needs to be cooled by appropriately dissipating the generated heat.

[0003] Inside the inverter unit, the density of the air heated by the heat-generating devices decreases, causing an upward air current in the opposite direction to gravity. For this reason, an opening is formed on the top surface of the main body case of the inverter unit to allow the air heated by the heat-generating devices to be discharged to the outside of the main body case, ensuring the necessary heat dissipation performance.

[0004] On the other hand, inverter units are general-purpose electronic devices and are used in various environments. For example, when an inverter unit is used in a heating / cooling air conditioning system, the inverter unit may be used in an environment where water droplets are generated due to condensation or the like. In this case, the inverter unit needs to have a drip-proof performance that allows it to operate normally even if it receives water droplets from vertically above. When water droplets penetrate into the inverter unit and adhere across multiple conductive parts, a short circuit occurs between the conductive parts, causing a current greater than expected to flow through the components, resulting in damage to the components.

[0005] To address this problem, a drip-proof cover is placed on the inverter unit to provide it with drip-proof performance. However, when a drip-proof cover is placed on an inverter unit that has a heat sink on its outer surface, the top surface of the drip-proof cover blocks the rising air current that is generated inside the drip-proof cover due to heat dissipation from the heat sink. In this case, the ventilation efficiency inside the drip-proof cover is reduced, which may lead to a decrease in the heat dissipation performance of the heat sink.

[0006] Patent Document 1 discloses a cover for an electronic device, the cover having an opening formed on the side surface. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2005-286086 A Summary of the Invention [Problem to be solved by the invention]

[0008] When the capacity of the inverter unit is large, ventilation slits are often provided on the side of the main body case of the inverter unit. However, in the case of the cover described in Patent Document 1, water droplets may enter the inside of the cover through the opening on the side of the cover, and further enter the inside of the inverter unit through the slits provided in the housing of the inverter unit. For this reason, there is a problem that the position where the slits are provided in the main body case of the inverter unit is limited to a position other than the side of the main body case.

[0009] The present disclosure has been made in consideration of the above, and aims to obtain a drip-proof cover that can impart drip-proof performance to an inverter unit equipped with a heat sink that dissipates heat from the inverter and prevent a decrease in the heat dissipation properties of the heat sink. [Means for solving the problem]

[0010] In order to solve the above problems and achieve the object, the drip-proof cover according to the present disclosure comprises: Equipped with a main body case having heat generating components inside This is a drip-proof cover that protects the inverter unit, which has a heat sink on the back of the inverter body. The drip-proof cover is provided as a separate body that is detachable from the inverter unit and covers the top, side and front surfaces of the inverter unit from outside the inverter unit. The drip-proof cover is for the inverter unit. side A first gap is provided from the inverter unit. side Cover side part and inverter unit Top A second gap is provided from the inverter unit. Top Cover Top and a cover front portion that covers the front surface of the inverter unit. The cover top portion has an air vent formed at a position corresponding to the heat sink when the cover top portion covers the top surface of the inverter unit. Effect of the Invention

[0011] According to the present disclosure, it is possible to obtain a drip-proof cover that can impart drip-proof performance to an inverter unit equipped with a heat sink that dissipates heat from an inverter and prevent a decrease in the heat dissipation performance of the heat sink. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a front perspective view of an inverter device according to a first embodiment; [Diagram 2] FIG. 2 is a front perspective view of an inverter unit included in the inverter device shown in FIG. [Diagram 3] FIG. 2 is a rear perspective view of an inverter unit included in the inverter device shown in FIG. 1. [Figure 4] FIG. 2 is a top view of an inverter unit included in the inverter device shown in FIG. [Diagram 5] FIG. 2 is a vertical cross-sectional view taken along a side of the inverter device shown in FIG. 1. [Figure 6] FIG. 2 is a first longitudinal sectional view of the inverter device shown in FIG. 1 when viewed from the front side; [Figure 7]FIG. 2 is a second vertical cross-sectional view of the inverter device shown in FIG. 1 when viewed from the front side; [Figure 8] FIG. 2 is a perspective view of the inverter device shown in FIG. 1, seen from the rear. [Figure 9] FIG. 2 is an enlarged cross-sectional view of an operation unit of the inverter device shown in FIG. [Figure 10] FIG. 2 is a vertical cross-sectional view showing a state in which a visor is provided on the drip-proof cover of the inverter device shown in FIG. [Figure 11] FIG. 2 is a vertical cross-sectional view showing a state in which a wall portion is provided on the top surface of the drip-proof cover of the inverter device shown in FIG. [Figure 12] A plan view of the drip-proof cover for the inverter device shown in Figure 1 before the metal plate is folded. [Figure 13] A front view of the drip-proof cover of the inverter device shown in FIG. 12 after bending the metal plate [Figure 14] FIG. 1 is a perspective view illustrating a fixing method of a drip-proof cover according to a first embodiment; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A drip-proof cover and an inverter device according to an embodiment will be described below in detail with reference to the drawings.

[0014] Embodiment 1 FIG. 1 is a perspective view of an inverter device according to a first embodiment, as viewed from the front. FIG. 2 is a perspective view of an inverter unit included in the inverter device shown in FIG. 1, as viewed from the front. FIG. 3 is a perspective view of the inverter unit included in the inverter device shown in FIG. 1, as viewed from the rear. FIG. 4 is a top view of the inverter unit included in the inverter device shown in FIG. 1, as viewed from above. FIGS. 2 and 3 show the inverter unit before a drip-proof cover 2 is attached in the inverter device 100. In FIG. 4, the position of the drip-proof cover 2 is also shown by a two-dot chain line. FIG. 5 is a vertical cross-sectional view along the side of the inverter device shown in FIG. 1.

[0015] The inverter device 100 according to the first embodiment includes an inverter unit 110 and a drip-proof cover 2. The inverter unit 110 includes an inverter main body 1 and a heat sink 11. The inverter device 100 is disposed so that the rear side faces a control panel of the facility or a wall surface close to a device to be controlled.

[0016] The width direction of the inverter device 100 corresponds to the direction from the upper right to the lower left in Fig. 1, which corresponds to the X-axis direction in Fig. 1. The depth direction of the inverter device 100 corresponds to the direction from the lower right to the upper left in Fig. 1, which corresponds to the Y-axis direction in Fig. 1. The height direction of the inverter device 100 corresponds to the up-down direction in Fig. 1, which corresponds to the Z-axis direction in Fig. 1. The front and front side of the inverter device 100 correspond to the direction toward the lower right in Fig. 1 along the depth direction of the inverter device 100. The rear and back side of the inverter device 100 correspond to the direction toward the upper left in Fig. 1 along the depth direction of the inverter device 100.

[0017] The inverter body 1 is a device that converts the frequency and current value of an input current and outputs the converted current, and has a rectangular parallelepiped outer shell. The inverter body 1 includes a main body case 10, an electronic component section 12, an operation section 13, and an external input / output section 14.

[0018] The electronic component section 12 is provided with electronic components such as semiconductor elements, capacitors, and resistors, which are heat-generating components, a plurality of boards on which the electronic components are mounted, and wiring and connectors between the plurality of boards, and electrically configures a circuit inside the main body case 10. In the electronic component section 12, the adhesion of water droplets to a location that spans two or more of the following: a plurality of wires on a board and between the wires, a plurality of terminals on a board and between the terminals, a plurality of electronic components and between the electronic components, or a wire, a terminal, and an electronic component, can cause a short circuit failure. For this reason, the electronic component section 12 needs to be protected from the intrusion of water droplets into the inverter main body 1. Therefore, the electronic component section 12 is subject to drip-proof protection by the drip-proof cover 2.

[0019] On the other hand, electronic components are sensitive to heat, and multiple openings 15 for dissipating heat are provided on the side surface 10b of the main body case 10. The openings 15 may be provided on the top surface 10a of the main body case 10. The size of each opening 15 is made small enough to prevent fingers or tools from accidentally entering the openings. The electronic component section 12 is provided on the front side of the inverter main body 1, opposite the wall surface, with the heat sink 11 in between.

[0020] The operation unit 13 is a user interface, and has buttons used by the user to set the inverter main body 1 and devices that display various parameters of the inverter main body 1. If water droplets get into the operation unit 13, a short circuit will occur in the internal electrical components, resulting in malfunction. For this reason, the operation unit 13 is subject to drip-proof protection by the drip-proof cover 2.

[0021] The external input / output unit 14 is provided at the bottom of the inverter main body 1 and performs electrical input / output with devices outside the inverter main body 1. The external input / output unit 14 is a wiring used for input from a power supply device of the inverter main body 1. and , and wiring used for output to devices controlled by the inverter main body 1. If water adheres to the terminal connection part of the external input / output unit 14, a short circuit will occur, resulting in malfunction. However, by providing the external input / output unit 14 at the bottom of the inverter main body 1, it is possible to protect the external input / output unit 14 from water droplets from above the inverter main body 1. For this reason, the external input / output unit 14 is not subject to drip-proof protection by the drip-proof cover 2.

[0022] The heat sink 11 has a plurality of fins, is fixed to the inverter body 1 while being in contact with the rear surface of the inverter body 1, and dissipates heat generated in the inverter body 1 to the outside of the inverter unit 110. That is, the heat sink 11 dissipates heat generated when the electronic component section 12 inside the inverter body 1 converts power to the outside of the inverter unit 110. The heat sink 11 includes an upper mounting section 111 that is attached to a wall surface close to the control panel of the facility or the device to be controlled, and a lower mounting section 112 that is attached to a wall surface close to the control panel of the facility or the device to be controlled. The heat sink 11 is a heat sink that does not cause problems even if water drops fall on it. The upper surface of the heat sink 11 is parallel to a horizontal plane when the inverter unit 110 is installed.

[0023] The heat sink 11 is manufactured by processes such as die casting, cutting, and extrusion. The heat sink 11 is made of a material with relatively high thermal conductivity among materials, and conducts heat generated by heat-generating components such as semiconductor elements of the electronic component section 12, and releases it into the air outside the inverter unit 110. Examples of materials with relatively high thermal conductivity include aluminum, magnesium, and various alloys including alloys of these. The heat sink 11 is not affected by water droplets except for the boundary section 113 between the electronic component section 12 and the heat sink 11. For this reason, the heat sink 11 is not subject to the drip-proof protection by the drip-proof cover 2.

[0024] The drip-proof cover 2 is a cover that covers the top, sides, and front of the inverter unit 110 to protect the inverter unit 110 and prevents water droplets from entering the inside of the inverter main body 1. The drip-proof cover 2 has an air vent 21 only on the cover top surface portion 2a, which is the top surface of the drip-proof cover 2 arranged above the heat sink 11. The drip-proof cover 2 exhausts the air inside the drip-proof cover 2 that has been warmed by the heat released from the heat sink 11 and the air inside the drip-proof cover 2 that has been warmed by the heat radiated from the surface of the electronic component portion 12, from the air vent 21 on the cover top surface portion 2a of the drip-proof cover 2 to the outside of the drip-proof cover 2.

[0025] The ventilation hole 21 is formed at a position corresponding to the heat sink 11 in a horizontal plane, i.e., at a position above the heat sink 11, when the top side of the inverter unit 110 is covered, i.e., when the upper part of the inverter unit 110 is covered. Depending on the position of the ventilation hole 21 on the top surface of the drip-proof cover 2, water droplets that adhere to the drip-proof cover 2 and infiltrate the inside of the drip-proof cover 2 through the ventilation hole 21 may drip onto the electronic component section 12 and infiltrate into the electronic component section 12. For this reason, the ventilation hole 21 is provided at a position corresponding to the heat sink 11 in a horizontal plane on the cover top surface section 2a of the drip-proof cover 2 when the top side of the inverter unit 110 is covered. This prevents water droplets that adhere to the drip-proof cover 2 and infiltrate into the inside of the drip-proof cover 2 through the ventilation hole 21 from dripping onto the electronic component section 12. The ventilation hole 21 is formed in the cover top surface 2 a of the drip-proof cover 2 at a position above a portion of the heat sink 11 that does not have a shape that would allow water droplets dripping onto the heat sink 11 to reach the electronic component portion 12 .

[0026] The cover top surface 2a, which is the top surface of the drip-proof cover 2, is preferably an inclined surface having an inclination that slopes downward toward the rear side of the inverter device 100, like the inclined portion 22 shown in Fig. 5. The rear side of the inverter device 100 can be said to be the rear side of the inverter unit 110.

[0027] The cover top surface 2a of the drip-proof cover 2 is formed as an inclined portion 22 that is an inclined surface that slopes downward toward the rear side of the inverter device 100, so that water droplets adhering to the inclined portion 22 fall toward the wall at the rear of the inverter device 100. If the cover top surface 2a of the drip-proof cover 2 is not inclined, and if the cover top surface 2a of the drip-proof cover 2 is inclined downward toward the front of the inverter device 100, water droplets adhering to the cover top surface 2a of the drip-proof cover 2 may move along the back side of the cover top surface 2a of the drip-proof cover 2. In this case, the water droplets move in the direction in which the slope of the cover top surface 2a of the drip-proof cover 2 is lowered, and therefore may drip onto the electronic component unit 12. Even if the cover top surface 2a of the drip-proof cover 2 is not inclined, the water droplets may move to a position above the electronic component unit 12 and drip onto the electronic component unit 12. The rear side of the inverter device 100 can be said to be the rear side of the inverter unit 110.

[0028] The case where water droplets adhere to the underside of the cover top surface portion 2a of the drip-proof cover 2 includes, for example, a case where water droplets move over the cover top surface portion 2a of the drip-proof cover 2 and go around the underside of the cover top surface portion 2a of the drip-proof cover 2 through the ventilation hole 21, and a case where water droplets pass through the ventilation hole 21 from above the cover top surface portion 2a of the drip-proof cover 2 and bounce off the heat sink 11 and adhere to the underside of the cover top surface portion 2a of the drip-proof cover 2. The case where water droplets move over the cover top surface portion 2a of the drip-proof cover 2 includes, for example, a case where multiple water droplets join together on the cover top surface portion 2a of the drip-proof cover 2 and become larger, and a case where water droplets move over the cover top surface portion 2a of the drip-proof cover 2 due to some factor such as vibration or wind.

[0029] Furthermore, with regard to the cover front portion 2c, which is the front surface of the drip-proof cover 2, when water droplets adhering to the cover top portion 2a of the drip-proof cover 2 or the cover side portion 2b, which is the side surface of the drip-proof cover 2, move, there is a risk that the water droplets will find their way around to the back side of the drip-proof cover 2. For this reason, as shown in Fig. 1, it is preferable that the drip-proof cover 2 is configured so that at least the edges where the cover top portion 2a of the drip-proof cover 2 and the cover side portion 2b of the drip-proof cover 2 are connected together without any gaps, covering the inverter unit 110.

[0030] Fig. 6 is a first vertical cross-sectional view of the inverter device shown in Fig. 1 when viewed from the front side. Fig. 6 shows the temperature distribution inside and around the inverter device 100. The circles and squares inside the inverter main body 1 in Fig. 6 indicate the electronic components of the inverter main body 1. In Fig. 6, the air temperature is indicated by hatching. It can be seen from Fig. 6 that the air temperature is higher toward the inside of the inverter main body 1 and decreases toward the outside of the inverter main body 1.

[0031] 6, in the inverter device 100, a first gap 24 is provided between the inverter unit 110 and the drip-proof cover 2 in the width direction. That is, in the inverter device 100, the first gap 24 is provided between the side surface 10b of the inverter main body 1 and the cover side surface portion 2b of the drip-proof cover 2. The side surface 10b of the inverter main body 1 and the cover side surface portion 2b of the drip-proof cover 2 are parallel to each other. The first gap 24 also includes the gap between the heat sink 11 and the cover side surface portion 2b of the drip-proof cover 2 in the width direction.

[0032] In the inverter device 100, due to the presence of a first gap 24 between the side surface 10b of the inverter main body 1 and the cover side surface portion 2b of the drip-proof cover 2, the air that is heated inside the inverter main body 1 and exhausted to the outside of the inverter main body 1 through the opening 15 in the side surface 10b of the inverter main body 1 is convected toward the cover top surface portion 2a of the drip-proof cover 2, thereby achieving a heat dissipation effect.

[0033] In order to obtain the heat dissipation effect by convection in the first gap 24, it is necessary to provide the first gap 24 with a horizontal size of at least 1 mm, and in order to ensure sufficient air flow, it is preferable to provide the first gap 24 with a size of approximately 10 mm.

[0034] As shown in Fig. 6, a second gap 25 is provided between the top surface 10a of the inverter body 1 and the cover top surface portion 2a of the drip-proof cover 2. The top surface 10a of the inverter body 1 and the cover top surface portion 2a of the drip-proof cover 2 are parallel to each other. Due to the existence of the second gap 25 between the top surface 10a of the inverter body 1 and the cover top surface portion 2a of the drip-proof cover 2, the inverter device 100 can obtain a heat dissipation effect by convection between the air that is heated inside the inverter body 1 and exhausted to the outside of the inverter body 1 from the opening 15 of the side surface 10b of the inverter body 1, and the air above the inverter body 1 that is heated inside the inverter body 1 and heated by heat dissipation from the top surface 10a of the inverter body 1.

[0035] In order to obtain a heat dissipation effect by convection in the second gap 25, it is necessary to provide a second gap 25 of at least 1 mm in the height direction of the inverter device 100, and in order to ensure sufficient air flow, it is preferable to provide a second gap 25 of about 10 mm.

[0036] In other words, by providing a gap between the inverter main body 1 and the drip-proof cover 2, the inverter device 100 can circulate air between the inverter main body 1 and the drip-proof cover 2, forming an air flow that flows from the lower end of the drip-proof cover 2 to the outside of the drip-proof cover 2, thereby improving the heat dissipation effect of the inverter main body 1.

[0037] Fig. 7 is a second vertical cross-sectional view of the inverter device shown in Fig. 1 when viewed from the front side. Fig. 7 shows the temperature distribution around the heat sink 11 in a cross section passing through the heat sink 11. In Fig. 7, similar to Fig. 6, the high and low air temperatures are indicated by hatching. It can be seen from Fig. 7 that the air temperature is higher near the heat sink 11 and decreases toward the outside of the heat sink 11.

[0038] 7, in the inverter device 100, a second gap 25 is provided between the inverter unit 110 and the drip-proof cover 2 in the height direction. That is, in the inverter device 100, the second gap 25 is provided between the heat sink 11 and the cover top surface 2a of the drip-proof cover 2. The second gap 25 also includes the gap between the inverter main body 1 and the cover top surface 2a of the drip-proof cover 2 in the height direction.

[0039] 7, it can be seen that the warmed air inside the drip-proof cover 2 accumulates in the second gap 25 at the upper part inside the drip-proof cover 2, and the warmed air is discharged to the outside of the drip-proof cover 2 through the ventilation hole 21 of the drip-proof cover 2. This shows that the ventilation hole 21 of the drip-proof cover 2 has a heat dissipation effect.

[0040] Fig. 8 is a perspective view of the inverter device shown in Fig. 1, seen from the rear. As shown in Fig. 8, a cover side portion 2b of the drip-proof cover 2 is partially formed of a transparent cover 3.

[0041] The transparent cover 3 allows the inside of the drip-proof cover 2 to be seen from the outside of the drip-proof cover 2. Since part of the cover side portion 2b of the drip-proof cover 2 is formed by the transparent cover 3, for example, information displayed on a device information display unit 16 provided on the inverter main body 1 shown in Fig. 2 can be confirmed without removing the drip-proof cover 2. The information displayed on the device information display unit 16 includes information on the inverter unit 110 and the inverter main body 1, such as a nameplate, the device configuration of the inverter unit 110, and the operating status of the devices in the inverter main body 1.

[0042] In particular, electronic devices such as inverters are required to display standard certification marks. Therefore, if the standard certification mark is obscured by a drip-proof cover, the same information must be written on the drip-proof cover.

[0043] In the inverter device 100, by making a part of the cover side portion 2b of the drip-proof cover 2 transparent, the information displayed on the inverter main body 1 can be confirmed without removing the drip-proof cover 2. This makes it possible for the inverter device 100 to eliminate the need to additionally mark the drip-proof cover 2 with information such as a standard certification mark.

[0044] In addition, in the inverter device 100, part of the cover side portion 2b of the drip-proof cover 2 is made into the transparent cover 3, but it is also possible to make the nameplate portion of the inverter main body 1 waterproof, and use the transparent cover 3 not as a cover but as an opening in the cover side portion 2b of the drip-proof cover 2, and to seal off water between the drip-proof cover 2 and the inverter main body 1 with a gasket or labyrinth structure, etc. In this case, too, the information displayed on the inverter main body 1 can be confirmed without removing the drip-proof cover 2, as in the above case, and there is an effect of eliminating the need to write additional information on the drip-proof cover 2.

[0045] Furthermore, the above-mentioned effect can be obtained by forming at least one of the cover top surface portion 2a, the cover side surface portion 2b and the cover front surface portion 2c with a transparent cover in part so that the inside of the drip-proof cover 2 can be seen from the outside of the drip-proof cover 2.

[0046] FIG. 9 is an enlarged cross-sectional view of the operation unit of the inverter device shown in FIG. 1. FIG. 9 shows the waterproof operation unit 13 exposed from the opening 23 formed in the cover front portion 2c. The operation unit 13 can be structured to prevent water droplets from penetrating to the electronic component portion 12 inside the inverter main body 1 by using a sheet button and a labyrinth structure for the button portion 131 and the joints 132 between the components. As a result, in the inverter device 100, the operation unit 13 is not subject to the drip-proof protection by the drip-proof cover 2. As a result, the inverter device 100 has an effect that the user can operate the operation unit 13 from outside the inverter device 100 even when the drip-proof cover 2 is attached.

[0047] FIG. 10 is a vertical cross-sectional view showing a state where a eaves portion is provided on the drip-proof cover of the inverter device shown in FIG. 1. In FIG. 10, the drip-proof cover 2 covers the top surface of the inverter unit 110 with the end of the cover top surface portion 2a of the drip-proof cover 2 protruding forward in the depth direction from the position where the cover front surface portion 2c of the drip-proof cover 2 is arranged. That is, in FIG. 10, the front end of the cover top surface portion 2a of the drip-proof cover 2 is provided with an eaves portion 26 protruding forward. By protruding the cover top surface portion 2a of the drip-proof cover 2 forward from the cover front surface portion 2c of the drip-proof cover 2 to provide the shape of the eaves portion 26 covering the front surface 10c of the inverter main body 1, it is possible to prevent water from entering the inverter main body 1 on the front side of the inverter main body 1. This makes it possible to eliminate the need for a waterproof structure such as a labyrinth structure of the sheet button of the button portion 131 of the operation unit 13 and the joint 132.

[0048] Fig. 11 is a vertical cross-sectional view showing a state in which a wall portion is provided on the cover top surface portion of the drip-proof cover for the inverter device shown in Fig. 1. In Fig. 11, a wall portion 27 protruding downward is provided on the opening end portion located on the front side among the opening ends of the ventilation opening 21 on the cover top surface portion 2a of the drip-proof cover 2.

[0049] The wall portion 27 is provided so as to protrude downward from an opening end located on the front side among the opening ends of the ventilation opening 21 in the cover top surface portion 2a of the drip-proof cover 2. The wall portion 27 guides downward water droplets that move from the front side to the rear side on the cover top surface portion 2a of the drip-proof cover 2 and drip from the ventilation opening 21. In other words, the wall portion 27 prevents water droplets that move from the front side to the rear side on the cover top surface portion 2a of the drip-proof cover 2 and drip from the ventilation opening 21 from adhering to the rear surface of the cover top surface portion 2a.

[0050] By providing the wall portion 27, water droplets that move from the front side to the rear side on the cover top surface portion 2a and drip from the ventilation opening 21 drip from the cover top surface portion 2a along the wall portion 27. This prevents water droplets that move from the front side to the rear side on the cover top surface portion 2a and drip from the ventilation opening 21 from adhering to the rear side of the cover top surface portion 2a. This prevents water droplets that move from the front side to the rear side on the cover top surface portion 2a and drip from the ventilation opening 21 from dripping along the rear side of the cover top surface portion 2a onto the electronic component portion 12, and prevents the water droplets from penetrating into the electronic component portion 12.

[0051] In the inverter device 100 shown in FIG. 11, the cover top surface 2a of the drip-proof cover 2 is an inclined portion 22 that is an inclined surface that slopes downward toward the rear side of the inverter device 100. The wall portion 27 is provided to protrude vertically downward from the opening end of the ventilation hole 21 located on the front side among the opening ends of the ventilation hole 21 in the inclined portion 22. Then, water droplets that move from the front side to the rear side on the inclined portion 22 and drip from the ventilation hole 21 drip downward from the inclined portion 22 along the wall portion 27. Therefore, water droplets that move from the front side to the rear side on the inclined portion 22 and drip from the ventilation hole 21 are prevented from adhering to the back side of the cover top surface 2a of the drip-proof cover 2. As a result, in the inverter device 100 shown in FIG. 11 , water droplets that move from the front side to the rear side along the inclined portion 22 and drip from the ventilation hole 21 are prevented from dripping down the back side of the inclined portion 22 onto the electronic component section 12, and the water droplets are prevented from penetrating into the electronic component section 12.

[0052] Furthermore, even if the cover top surface 2a of the drip-proof cover 2 is not inclined, the wall portion 27 can provide the above-mentioned effects.

[0053] Furthermore, wall portion 27 may protrude downward from an opening end portion located on the front side of the opening end portion of ventilation opening 21 in cover top surface portion 2a. Wall portion 27 may be provided with an inclination toward the rear as it extends downward from an opening end portion located on the front side of the opening end portion of ventilation opening 21.

[0054] Fig. 12 is a plan view of the drip-proof cover of the inverter device shown in Fig. 1 before the sheet metal bending process. Fig. 13 is a front view of the drip-proof cover of the inverter device shown in Fig. 12 after the sheet metal bending process. Fig. 12 shows a material sheet metal 200 of the drip-proof cover 2 before the sheet metal bending process. The material sheet metal 200 is made of a single seamless sheet metal including a front sheet metal portion 201 which becomes the cover front portion 2c of the drip-proof cover 2, a top sheet metal portion 202 which becomes the cover top surface portion 2a of the drip-proof cover 2, and side sheet metal portions 203, 204 which become the cover side portions 2b of the drip-proof cover 2.

[0055] The drip-proof cover 2 can be made of a sheet metal product that is an integrated part manufactured by bending a metal sheet. The drip-proof cover 2 can also be made of a resin molded product that is an integrated part manufactured by resin molding. By making the drip-proof cover 2 an integrated sheet metal product or resin molded product, it is possible to eliminate seams and reduce the path for water to enter the drip-proof cover 2 when it covers the inverter device 100. This allows the inverter device 100 to improve the waterproof performance of the inverter main body 1.

[0056] 14 is a perspective view for explaining a fixing method of the drip-proof cover according to the embodiment 1. At least one of the cover top surface portion 2a, the cover side surface portion 2b, and the cover front surface portion 2c of the drip-proof cover 2 can be fixed to the inverter unit 110 by sharing the screw fixing portion of the inverter unit 110.

[0057] 14, the drip-proof cover 2 has a cover-side screw fixing portion (not shown) formed at a position corresponding to the screw fixing portion 181 of the wiring cover 18 of the inverter body 1, and is screw-fixed to the inverter body 1 using the screw fixing portion 181 of the wiring cover 18 and the cover-side screw fixing portion. That is, the drip-proof cover 2 is provided with a fixing portion that can be fixed to the inverter body 1 by sharing the screw fixing portion 181 of the wiring cover 18 of the inverter body 1, so that the drip-proof cover 2 can be attached to the inverter body 1 without removing the inverter body 1 from the installation surface of the inverter device 100. Also, the drip-proof cover 2 may have a cover-side screw fixing portion formed at a position corresponding to the screw fixing portion 171 of the front cover 17 of the inverter body 1.

[0058] This allows wiring and setting work to be performed by simply installing the inverter main body 1 on a wall without the drip-proof cover 2 attached when constructing the inverter device 100. As a result, the workability of the external input / output unit 14 and the operation unit 13 is improved, and effects such as reducing wiring errors, reducing setting errors for various settings, and shortening work time are obtained.

[0059] As described above, in the inverter device 100 according to the first embodiment, the drip-proof cover 2 is a cover for the main body case of the inverter unit 110. 10 This allows for good heat dissipation and drip resistance while maintaining the degree of freedom in designing the position of the ventilation hole 21 in the housing.

[0060] In the inverter device 100, air heated by the heat sink 11 provided on the back surface of the inverter unit 110 generates an ascending air current and is discharged to the outside of the drip-proof cover 2 through the ventilation openings 21 in the cover top surface 2a of the drip-proof cover 2. This prevents the heated air from stagnating inside the drip-proof cover 2 and improves the flow rate of the air flowing between the fins of the heat sink 11, thereby improving the heat dissipation performance of the inverter unit 110.

[0061] Furthermore, by using the drip-proof cover 2, the inverter device 100 can freely provide openings on the side surface 10b and the top surface 10a of the inverter body 1. In the inverter device 100, the heat of the inverter body 1 is dissipated by convection inside the drip-proof cover 2 of the air exhausted from inside the inverter body 1, so that the heat dissipation performance of the inverter body 1 from sources other than the heat sink 11 can also be improved.

[0062] In addition, in the inverter device 100, by improving the heat dissipation performance of the inverter main body 1, it is possible to obtain effects such as fanless operation, reducing the size of the inverter main body 1, increasing the upper limit of the operating environment temperature, and increasing the upper limit of the output of the inverter main body 1.

[0063] The configurations shown in the above embodiments are merely examples, and may be combined with other known technologies, or the technologies described in the embodiments may be combined with each other. Furthermore, parts of the configurations may be omitted or modified without departing from the spirit of the invention. [Explanation of symbols]

[0064] 1 inverter body, 2 drip-proof cover, 2a cover top surface, 2b cover side surface, 2c cover front surface, 3 transparent cover, 10 body case, 10a top surface, 10b side surface, 10c front, 11 heat sink, 12 electronic component section, 13 operation section, 14 external input / output section, 15, 23 opening, 16 device information display section, 17 Front cover, 18 wiring cover, 21 ventilation hole, 22 inclined portion, 24 first gap, 25 second gap, 26 eaves portion, 27 wall portion, 100 inverter device, 110 inverter unit, 111 upper mounting portion, 112 lower mounting portion, 113 boundary portion, 131 button portion, 132 joint, 171, 181 screw fixing portion, 200 sheet metal material, 201 front sheet metal portion, 202 top sheet metal portion, 203, 204 side sheet metal portion.

Claims

1. A drip-proof cover for protecting an inverter unit having a heat sink on the back of an inverter main body having a main body case with a heat generating component inside, a cover cover provided as a separate body detachably attached to the inverter unit and covering a top surface, a side surface and a front surface of the inverter unit from outside the inverter unit; a cover side portion that covers a side surface of the inverter unit with a first gap provided from the side surface of the inverter unit; a cover top surface portion that covers the top surface of the inverter unit with a second gap provided from the top surface of the inverter unit; a cover front portion that covers a front surface of the inverter unit; Equipped with the cover top surface portion has a vent hole formed at a position corresponding to the heat sink when the cover top surface portion covers the top surface of the inverter unit; A splash-proof cover featuring.

2. the first gap and the second gap are 1 mm or more; The drip-proof cover according to claim 1 .

3. the cover top surface portion covers a top surface of the inverter unit in a state in which the cover top surface portion has a downward inclination toward a rear surface of the inverter unit; The drip-proof cover according to claim 1 .

4. At least one of the cover top surface portion, the cover side surface portion, and the cover front surface portion is partially formed of a transparent cover; The drip-proof cover according to claim 1 .

5. The inverter body has a waterproof operation unit on a front surface thereof, The cover front portion has an opening for exposing the operation portion; The drip-proof cover according to claim 1 .

6. the cover top surface portion covers a top surface of the inverter unit in a state where an end portion of the cover top surface portion protrudes forward beyond the cover front portion; The drip-proof cover according to claim 1 .

7. The cover top surface portion, the cover side surface portion, and the cover front surface portion are integral parts made of sheet metal or resin molded products; The drip-proof cover according to claim 1 .

8. At least one of the cover top surface portion, the cover side surface portion, and the cover front surface portion of the drip-proof cover has a fixing portion that is fixed to the inverter main body by using a screw fixing portion provided on the inverter unit; The drip-proof cover according to claim 1 .

9. the cover top surface portion has a wall portion protruding downward from an opening end portion of the vent hole that is located on a front side; The drip-proof cover according to any one of claims 1 to 8,

10. A drip-proof cover according to claim 1; The inverter unit; An inverter device comprising:

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