JP6603873B2 - Enclosure that houses the electrical circuit device - Google Patents

Description

The present invention relates to a housing that houses an electric circuit device, and more particularly to a technique for draining water droplets in the housing.

As one of the electric circuit devices housed in the housing, an orthogonal transformation circuit that converts DC power generated by the solar cell into AC power and a power module (heat-generating semiconductor switching element) that constitutes this orthogonal transformation circuit are attached. There is a power conversion circuit for a photovoltaic power generation system configured with a heat sink or the like, and a power conversion device (referred to as a power conditioner) in which the power conversion circuit is housed in a casing is known (Patent Document 1).

JP 2009-164351 A

When installing the inverter that houses the electric circuit device in the housing at the required location of the house, that is, when installing the inverter on the outside wall of the house, or when installing the inverter on the stand of the field In such a case, since it is exposed to wind and rain, it is important to prevent rainwater and dust from entering the power conditioner and to effectively dissipate heat generated by the electric circuit device.

In a power conditioner, in order to release the heat generated in the electric circuit device out of the housing and allow the electric circuit device to operate stably, the air intake section into the housing and the air that releases the heat generated in the housing out of the housing The discharge part is formed. In this case, in a strong wind and rain situation, rainwater may enter the housing from the air intake portion and the air discharge portion, and this may flow down and collect on the lower wall of the housing.
Further, due to the difference between the temperature inside the housing and the ambient temperature, water droplets may adhere to the wall surface inside the housing and flow down and accumulate on the lower wall of the housing.

In the drainage structure in which a drainage cap can be taken in a drainage hole formed in the lower wall of the casing in order to discharge water accumulated in the lower wall of the casing, the present invention performs smooth drainage and attaches the drainage cap. The present invention provides a technology with a configuration that is easy to perform.

The present invention is a housing that houses an electric circuit device, and is installed at a required location on the back wall side of the housing.
A drainage cap detachably attached to a drainage hole in the lower wall of the housing, the drainage cap covering the opening of the drainage hole, and extending from the head to the drainage hole A plurality of arc-shaped insertion portions that are inserted along the inner peripheral wall, a drainage groove between adjacent insertion portions of the insertion portion, and a periphery of the drainage hole at the tip of the insertion portion And a drainage channel that communicates with the drainage groove on the back surface of the head and drains the outer periphery of the head, and the outer surface on the lower side of the head is at the center of the head. And a non-slip portion formed by a convex portion or a concave portion that does not hinder the flow of water.

The non-slip portion is a ridge formed in a circular shape centering on the central portion of the outer surface of the head,
Or it is many protrusions formed in the outer surface of the said head.

The anti-slip portion is formed by a groove in which water that has turned around to the outer surface of the head is directed toward the center of the outer surface of the head.

The back surface of the head includes an elastic peripheral portion that protrudes toward the locking portion from the center, and the head presses the outer surface of the lower wall of the housing by the elasticity of the elastic peripheral portion, The drainage path is formed in a state in which the locking portion is elastically locked around the drainage hole.

According to the present invention, the lower outer surface of the head bulges downward toward the central portion in order to smoothly drain the housing from the central portion of the lower surface of the drain cap. In this case, a synthetic resin drain cap is fitted into the drain hole. In this case, the operator presses the head of the drainage cap from below with the finger, but because the finger is made of synthetic resin, it is difficult to insert the finger optimally.
However, an anti-slip part is formed on the outer surface of the lower side of the head, and the anti-slip part is formed with a convex part or a concave part that does not disturb the flow of water, so that the finger is prevented from slipping and is optimally pressed. Thus, the work efficiency is improved and the flow of water is secured, so that the water can be smoothly drained from the center of the lower surface of the drain cap.

In addition, the anti-slip portion has an anti-slip effect and an easy-to-press effect by being formed into a circular ridge formed around the center of the outer surface of the head or a large number of protrusions. If a plurality of ridges are formed concentrically, the anti-slip portion can be easily formed. This ridge can achieve the anti-slip effect even if the water flowing out of the housing easily reaches the height of the natural flow. In addition, if a notch is provided in this ridge, the flow of water becomes better. In the case of a large number of protrusions, water flows between the protrusions.

In addition, the anti-slip part is formed by a groove in which the water that has turned around to the outer surface of the head is directed to the center of the outer surface of the head, so that the water that flows out from the inside of the housing naturally flows under the outer surface of the head. It becomes easy to flow to the central part of the sheet, and an anti-slip effect and an effect of being easily pressed can be achieved.

Furthermore, the back surface of the head includes an elastic peripheral portion that protrudes toward the locking portion from the center portion, and the head presses the outer surface of the lower wall of the housing by the elasticity of the elastic peripheral portion, and the locking portion is A drainage path is formed in a state of elastically locking to the tip of the locking receiving portion. For this reason, since the head is in close contact with the outer surface of the lower wall of the housing, and the locking portion is elastically locked to the tip of the locking receiving portion, the holding of the drainage cap is stable, and the drainage path is accurately secured. Become.

It is a front perspective view which shows a state when the door of the power converter device which concerns on embodiment of this invention is opened. It is a perspective view of the drainage cap inserted in the drainage hole formed in the lower wall of the housing | casing which concerns on this invention. It is sectional drawing explaining the drainage state of the state which attached the drainage cap to the drainage hole formed in the lower wall of the housing | casing which concerns on this invention. It is sectional drawing explaining the drainage state of the state which attached the drainage cap to the drainage hole formed in the lower wall of a housing | casing as other embodiment which concerns on this invention. It is a figure of the drainage cap concerning the present invention, (I) is a bottom view seen from the head side of a drainage cap, (B) is a side view of a drainage cap, and (C) is a top view of a drainage cap. The other embodiment of the drainage cap which concerns on this invention is shown, (A) is the bottom view seen from the head side of the drainage cap, (B) is sectional drawing which shows the location of the hollow 20B of a drainage cap. The other embodiment of the drainage cap which concerns on this invention is shown, (A) is the bottom view seen from the head side of the drainage cap, (B) is sectional drawing which shows the location of the hollow 20C of a drainage cap. The other embodiment of the drainage cap which concerns on this invention is shown, (A) is the bottom view seen from the head side of the drainage cap, (B) is a side view of the drainage cap. The other embodiment of the drainage cap which concerns on this invention is shown, (A) is the bottom view seen from the head side of the drainage cap, (B) is a side view of the drainage cap. The other embodiment of the drainage cap which concerns on this invention is shown, (A) is sectional drawing which shows the location of the drainage groove 17C and the drainage channel 17E, (B) has removed the location of the drainage channel 17C and the drainage channel 17E. It is sectional drawing of a position.

The present invention has a drainage cap that is detachably attached to a drainage hole in a lower wall of a housing that houses an electric circuit device, the drainage cap having a size that covers an opening of the drainage hole, and the head A plurality of arc-shaped insertion portions extending from the inner peripheral wall of the drainage hole, a drainage groove between the adjacent insertion portions of the insertion portion, and the drainage at the tip of the insertion portion A locking portion that locks around the hole, and a drainage channel that communicates with the drainage groove on the back surface of the head and drains to the outer periphery of the head. While bulging outward toward the center of the head,
It is a structure provided with the slip prevention part formed of the convex part or recessed part of the grade which does not prevent the flow of water.
The embodiment will be described below with reference to the drawings.

A power conversion device 1 according to an embodiment of the present invention is called a power conditioner, and as shown in FIG. 1, a casing 2 is constituted by a main body 3 and a door 4, and renewable energy such as sunlight. An electric circuit device that constitutes a power conversion circuit that converts DC power obtained from AC into AC that can be superimposed on a commercial power system is accommodated in the main body 3.

The main body 3 forms a cubic box surrounded by the upper wall 3A, the lower wall 3B, the left wall 3C, the right wall 3D, and the back wall 3E, and has a rectangular front opening 3F. The door 4 has a shape matched to the front shape of the main body 3 so as to cover the front opening 3F of the main body 3, and has a rectangular shape with a predetermined thickness when viewed from the front. The door 4 is configured to be freely opened and closed by a hinge device 5 on one side (right side or left side) of the main body 3 and locked to the main body 3 by a lock device 6. In FIG.
A door 4 is attached to the right side of the main body 3 by a hinge device 5 so as to be freely opened and closed. The main body 3 includes an annular flange 10 that circulates around the periphery of the front opening 3 </ b> F, and includes an annular packing 11 at the rear peripheral edge of the door 4, with the door 4 closed and locked to the main body 3 by the lock device 6. 11 closely contacts the annular flange 10 and closes the front opening 3F.

As shown in FIG. 1, when the door 4 is opened, it is dangerous if a person touches the electric circuit device. As a preventive measure, the electric circuit device is detachable with cover plates 7A and 7B. Covering. The indicator 8 with which the operating state of the electric circuit device can be visually recognized faces the window 9 of the cover plate 7A in a state covered with the cover plates 7A and 7B. The left wall 3C and the right wall 3D of the main body 3 are provided with an air intake portion 12 that takes air into the housing 2 for cooling the electric circuit device. The lower wall 3 </ b> B includes an air discharge unit 13 that discharges air in the housing 2. A fan is accommodated in the housing 2, and air that has flowed in from the air intake unit 12 by the operation of the fan cools the electric circuit device and is discharged from the air discharge unit 13 to the outside of the housing 2.

The lower wall 3 </ b> B of the housing 2, i.e., the lower wall 3 </ b> B of the main body 3 is provided with a drainage unit 15 for discharging water in the housing 2. One or more drainage sections 15 are provided. In the drainage part 15, a drainage cap 17 is attached to a drainage hole 16 formed in the lower wall of the housing 2 that accommodates the electric circuit device, that is, the lower wall 3 </ b> B of the main body 3.

As shown in FIGS. 2 and 3, the drain cap 17 is made of synthetic resin, and includes a head 17A having a size covering the area of the lower opening of the drain hole 16, and a drain hole 16 extending from the head 17A. A plurality of arc-shaped insertion portions 17B inserted along the inner surface, drainage grooves 17C formed between the insertion portions 17B so as to communicate the inside of the housing 2 and the drainage holes 16, and the drainage holes 16 A locking portion 17D that protrudes outwardly in a key shape at the distal end of the insertion portion 17B so as to be locked to the peripheral edge of the head, and a head portion 17A
A drainage channel 17E that opens to the outer periphery of the head 17A is provided on the back surface of the head so as to communicate with each drainage groove 17C. In this case, the insertion portion 17B is divided into four parts by drainage grooves 17C formed at four positions at intervals of 90 degrees, but may be formed at two positions at intervals of 180 degrees, and more. But you can.

3 shows a form in which the locking portion 17D of the drainage cap 17 is locked to the inner side surface of the lower wall 3B of the main body 3. However, when the thickness of the lower wall 3B is small, the drainage cap 17 is attached. It is difficult to stabilize. In this case, as shown in FIG. 4, the peripheral portion of the drain hole 16 is formed so as to form a plurality of arc-shaped locking receiving portions 18 slightly bent with the lower wall 3 </ b> B of the main body 3 facing into the main body 3. Burring is performed inwardly, and a drainage groove 19 is formed between the locking receiving portions 18. In this case, the latch receiving portion 18 is divided into four parts by drainage grooves 19 formed at four positions at intervals of 90 degrees, but may be formed at two positions at intervals of 180 degrees, and more. You may do it.

The lower outer surface of the head 17A has a shape that bulges downward toward the central portion CT so that drainage can be smoothly performed without scattering, as will be described later. Make.

In the above-described configuration, the insertion portion 17B of the drain cap 17 is inserted from the lower opening of the drain hole 16 while pushing the lower outer surface of the head 17A. At this time, since the outer diameter formed by the entire four locking portions 17D is larger than the diameter of the drainage hole 16, the four insertion portions 17B are bent substantially inward by the elasticity of the insertion portion 17B. The insertion portion 17B enters along the inner surface of the drain hole 16. When the back surface of the head portion 17A comes into contact with the lower surface of the lower wall 3B, the restraint of the insertion portion 17B by the drain hole 16 is released, so that the four locking portions 17D are respectively locked to the corresponding tips. Thus, the insertion portion 17B is elastically restored.

As a result, as shown in FIG. 3, the locking portion 17 </ b> D and the head portion 17 </ b> A sandwich the lower wall 3 </ b> B, and the drain cap 17 is attached to the drain hole 16 in a stable state. In this attached state, by the drainage path formed by the communication between the drainage groove 17C and the drainage path 17E,
The inside of the housing 2 communicates with the outside of the housing 2.

Further, as shown in FIG. 4, when the peripheral edge of the drain hole 16 is burred to form a plurality of locking receiving portions 18, the drain cap 17 is pressed while pressing the outer surface below the head 17 </ b> A. Is inserted from the lower opening of the drain hole 16. At this time, since the outer diameter formed by the whole of the four locking portions 17D is larger than the diameter of the drainage hole 16, the four insertion portions 17B bend inward substantially uniformly by the elasticity of the insertion portion 17B. The insertion portion 17 </ b> B enters along the inner surface of the drain hole 16. When the back surface of the head portion 17A comes into contact with the lower surface of the lower wall 3B, the restraint of the insertion portion 17B by the drainage hole 16 is released, so that the four latching portions 17D respectively correspond to the corresponding latch receiving portions 18. The insertion portion 17B is elastically restored so as to be locked to the tip of the.

As a result, as shown in FIG. 4, the locking portion 17 </ b> D and the head portion 17 </ b> A sandwich the lower wall 3 </ b> B, and the drain cap 17 is attached to the drain hole 16 in a stable state. In this attached state, the inside of the housing 2 and the outside of the housing 2 communicate with each other through a drainage path formed by the communication of the drainage groove 19, the drainage groove 17C, and the drainage path 17E.

With such a configuration, the lower wall 3 in the housing 2 is obtained in any of the forms shown in FIGS.
As indicated by the arrow, the water accumulated in B flows out through the drainage channel, and the water that has exited from the outlet 17ED of the drainage channel 17E travels along the outer surface of the lower side of the head 17A to the center of the head 17A. It flows toward the part CT and flows down from the central part CT. For this reason, it can suppress that drainage disperses from head 17A.
In addition, although the said drainage path discharges | emits water, the magnitude | size from which external air does not flow into the housing | casing 2 is preferable. In addition, this drainage path is formed at four locations at intervals of 90 degrees, but 2 at intervals of 180 degrees.
It may be a part or even more.

When the drain cap 17 is attached to the drain hole 16, it is inserted into the drain hole 16 while pushing the lower outer surface of the head 17A. As described above, the insertion portion 17B is inserted inward while being bent inward by elasticity. Therefore, a considerable pressing force is applied to the head 17A. In this case, the drain cap 17 is made of a synthetic resin, and the lower outer surface of the head portion 17A has a shape that bulges downward toward the center portion CT, so that the operator's finger can easily slip from the head portion 17A. It is difficult to push the drain cap 17 into the drain hole 16 in a normal state.

In order to prevent this, the outer surface of the lower side of the head portion 17A is formed with convex portions or concave portions that do not hinder the flow of water while maintaining a shape that bulges downward toward the central portion CT. An anti-slip part 20 is provided.
As a first embodiment of the anti-slip part 20, as shown in FIG. 5, when the water flowing out from the inside of the housing 2 travels along the outer surface of the head 17A, the ridge 20A having a height that can be overcome by natural flow, Head 17
It is formed in a circular shape centering on the central portion CT of the outer surface of A. In order to facilitate the flow of water,
As shown by the dotted line, a notch 20AK is formed at a position corresponding to the outlet portion 17ED of the drainage channel 17E.
This can be used as a water passage. The same parts as those in the above embodiment are denoted by the same reference numerals.

As a second embodiment of the anti-slip portion 20, as shown in FIG. 6, a recess 20B is provided from the outlet portion 17ED of the drainage channel 17E toward the central portion CT of the head portion 17A, and this recess 20B is used as the outlet portion of the drainage channel 17E. It can be a passage of water that circulates from 17ED to the outer surface of the head 17A. The same parts as those in the above embodiment are denoted by the same reference numerals.

As a third embodiment of the anti-slip portion 20, as shown in FIG. 7, two convex walls 2 are formed so as to form a recess 20C from the outlet portion 17ED of the drainage channel 17E toward the central portion CT of the head portion 17A.
0CF is formed, and this recess 20C is connected to the head 17A from the outlet portion 17ED of the third drainage groove 17E.
It can be a passage of water that goes around the outer surface of the water. The same parts as those in the above embodiment are denoted by the same reference numerals.

As a fourth embodiment of the anti-slip portion 20, as shown in FIG. 8, a large number of ridges 20D are formed from the periphery of the head portion 17A toward the central portion CT of the head portion 17A. In this case, the water that circulates between the two ridges 20D from the position sandwiching the outlet portion 17ED of the drainage channel 17E toward the central portion CT of the head portion 17A from the outlet portion 17ED of the drainage channel 17E to the outer surface of the head portion 17A. It can be a passage. The same parts as those in the above embodiment are denoted by the same reference numerals.

As a fifth embodiment of the anti-slip portion 20, as shown in FIG. 9, the anti-slip portion 20 includes a large number of protrusions 20E formed on the outer surface of the head portion 17A. The protrusions 20E have a circular arrangement centered on the central portion CT of the head 17A, but may be a random arrangement. The space between the protrusions 20E can be a water passage that goes from the outlet portion 17ED of the drainage channel 17E to the outer surface of the head portion 17A. The same parts as those in the above embodiment are denoted by the same reference numerals.

When attaching the drain cap 17 to the drain hole 16, the drain cap 17 is attached to the drain hole 16 so that the marks coincide with each other by forming marks on the outer surface of the head 17A and the lower surface of the lower wall 3B. Can do.

As shown in FIG. 10, the back surface of the head portion 17A includes an elastic peripheral portion 17F that protrudes toward the locking portion 17D from the center portion, and the head portion 17A is below the housing 2 by the elasticity of the elastic peripheral portion 17F. If the outer surface of the wall 3B is pressed so that the locking portion 17D is elastically locked to the drain hole 16 and the drain path is formed, the state where the drain cap 17 is attached to the drain hole 16 is further stabilized. .
In this case, as shown in FIG. 9, if the outer shape of the head 17A is an ellipse or an ellipse,
It becomes easy to attach the drain cap 17 to the drain hole 16.

In any of the above embodiments, if the thickness of the entire head 17A is reduced, FIG.
As shown in FIG. 0, the head 17A has an elastic peripheral edge 17F or the head 17
Since the whole of A has elasticity, the head 17A is attached to the drain hole 16 in the state of being attached to the drain hole 16.
The back surface of the elastic member contacts the outer surface of the lower wall 3B of the housing 2 due to elasticity, and the state attached to the drain hole 16 becomes stable.

DESCRIPTION OF SYMBOLS 1 ... Power converter device 2 ... Housing 3 ... Main body 3B ... Lower wall 4 ... Door 5 ... Hinge 15 ... Drainage Portion 16 ... Drain hole 17 ... Drain cap 17A ... Drain cap head 17B ... Insertion portion 17C ... Drain groove 17D ... Locking portion 17E ... Drain channel 17ED ··· Drain channel outlet 18 ··· Locking receiving portion 19 ··· Drain groove 20 ··· Slip stopper 20A · · · Projection strip 20B · · · depression 20C · · · depression 20D ···・ Projection 20E ・ ・ ・ Projection

Claims (4)

A housing that houses an electrical circuit device ,
Attached to the required location on the back wall side of the housing,
It has a detachable drain cap on the drain hole of the lower wall of the housing ,
The drain cap is a head having a size that covers the opening of the drain hole, and a plurality of arc-shaped insertion portions that extend from the head and are inserted along the inner peripheral wall of the drain hole,
A drainage groove between each adjacent insertion part of the insertion part, a locking part locked around the drainage hole at the tip of the insertion part,
A drainage channel communicating with the drainage groove on the back surface of the head and draining to the outer periphery of the head;
The outer surface of the lower side of the head is provided with a non-slip portion formed by a convex portion or a concave portion that bulges outward toward the central portion of the head and does not hinder the flow of water. A housing for housing an electric circuit device characterized by the above. The non-slip portion is a ridge formed in a circular shape centering on the central portion of the outer surface of the head,
The housing for housing the electric circuit device according to claim 1, wherein the housing is a plurality of protrusions formed on an outer surface of the head. 2. The electric circuit device according to claim 1, wherein the anti-slip portion is formed by a groove in which water that has turned to the outer surface of the head heads toward a central portion of the outer surface of the head. Enclosure. The back surface of the head includes an elastic peripheral edge that protrudes toward the locking part from the center part,
The drainage path is formed in a state where the head presses the outer surface of the lower wall of the housing by the elasticity of the elastic peripheral edge, and the locking portion elastically locks around the drainage hole. A housing for housing the electric circuit device according to any one of claims 1 to 3.

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