JP2013258816A - Distribution board for housing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a distribution board for a housing which inhibits heat generation of conductive bars without conducting large scale design changes.SOLUTION: In a single phase three lines type cable way L, three conductive bars 3 are overlapped in a forward-backward direction and each of the conductive bars extends to left and right sides in a belt like manner in the overlapping state. Further, multiple branch breakers 2 are disposed at both sides of the conductive bars 3 in a vertical direction. In the single phase three lines type cable way L, heat radiation members 4 are placed between the conductive bars 3 and between the conductive bar 3 at the deepest part and a panel 5 at a rear part. Each heat radiation member 4 is formed by a bar made of a synthetic resin and a surface of the heat radiation member 4 is covered by an insulation heat radiation member 5b having thermal emissivity equal to or higher than a specific value. Each heat radiation member 4 is placed to adhere to the conductive bars 3 at the front and rear sides thereof and one of the heat radiation members 4 is placed to adhere to the conductive bar 3 and the panel 5.

Description

  The present invention relates to a residential distribution board, and more particularly, to a residential distribution board in which three conductive bars of a single-phase three-wire circuit arranged to connect a branch breaker are stacked.

Residential distribution boards are receiving high-density storage of branch breakers and the like in a predetermined space in response to the recent increase in electrical facilities and high functionality such as overcurrent alarm functions. FIG. 4 shows an example in which three conductive bars 11 constituting the AA wire circuit L are arranged in a stacked manner for high-density storage and a branch breaker 12 is connected to the conductive bars 11 from such a background. Is shown.
As shown in FIG. 4, when the three conductive bars 11 are stacked and the branch breakers 12 are arranged on both sides thereof, the heat generation of the conductive bars 11 becomes significant, so that a heat dissipation measure has been required. . As a heat dissipation measure, as disclosed in Patent Document 1, a plurality of slits are provided at the end of the conductive bar to increase the surface area, and as disclosed in Patent Document 2, the width of the conductive bar 11 is increased. There was a configuration that increased heat dissipation efficiency.

JP 2002-171619 A JP 2001-157324 A

However, in the case of the configuration of Patent Document 1, although heat generation at the end portion of the conductive bar could be suppressed, it was possible to sufficiently suppress the temperature rise of the conductive bar in the narrow space where the branch breakers were arranged. There wasn't.
In the case of Patent Document 2, it is possible to suppress the temperature rise in the narrow space where the branch breakers are arranged by increasing the width of the conductive bar, but the metal such as copper forming the conductive bar As the amount used increased, the cost was increased, a large installation space for the conductive bar was required, and a large design change of the distribution board was required.

  Then, in view of such a problem, an object of the present invention is to provide a residential distribution board that can suppress heat generation of a conductive bar without making a major design change.

In order to solve the above-mentioned problem, the invention of claim 1 is directed to a single-phase three-wire electric circuit in which three conductive bars are stacked and extended in a strip shape in the left-right or vertical direction. In a residential distribution board in which a branch circuit of the single-phase three-wire circuit is formed by disposing a branch breaker, a heat dissipating member is disposed between the stacked conductive bars to promote heat dissipation of the conductive bar The heat dissipating member is a rod whose surface is at least covered with an insulating heat dissipating material having a thermal emissivity of a specific value or more, and is arranged in close contact with at least one conductive bar. To do.
According to this configuration, the heat dissipation of the conductive bar is promoted by disposing the heat dissipation member having a thermal emissivity of a specific value or more between the conductive bars. Therefore, even if the conductive bars are stacked, the temperature rise due to heat generation can be suppressed without making a major design change such as increasing the width of the conductive bars.

According to a second aspect of the present invention, in the configuration according to the first aspect, the branch breaker is attached to a metal panel disposed on the rear surface of the distribution board case, and is located between the conductive bar at the innermost portion and the panel. Further, the heat dissipation member is arranged.
According to this configuration, the heat radiation of the innermost conductive bar is also promoted, so that the temperature rise due to the heat generation at the innermost part of the stacked conductive bars can be suppressed.

According to a third aspect of the present invention, in the configuration of the second aspect, the insulating heat radiating material of the heat radiating member disposed between the innermost conductive bar and the panel has a thermal conductivity of a predetermined value or more. The heat dissipating member has a thickness corresponding to the gap to be disposed and is in close contact with both the conductive bar and the panel.
According to this structure, since the heat dissipation member has a thermal conductivity equal to or higher than a predetermined value and is in close contact with the panel, the innermost conductive bar can dissipate heat to the panel via the heat dissipation member. Therefore, it is possible to favorably dissipate the heat generated by the conductive bar disposed at the back of the distribution board.

Invention of Claim 4 is the structure in any one of Claims 1 thru | or 3. The insulating heat dissipation material of the heat radiating member arrange | positioned between the said conductive bars has thermal conductivity more than predetermined value, The said The heat dissipating member has a thickness matched to the interval between the conductive bars and is in close contact with both the front and rear conductive bars.
According to this configuration, the heat dissipation member has a thermal conductivity equal to or higher than a predetermined value and is in close contact with both conductive bars. It becomes possible to radiate heat well through the conductive bar.

  According to the present invention, the heat dissipation of the conductive bar is promoted by disposing the heat dissipation member between the conductive bars. Therefore, even if the conductive bars are stacked, the temperature rise due to heat generation can be suppressed without making a major design change such as increasing the width of the conductive bars.

It is a fragmentary perspective view which shows an example of the distribution board for houses concerning this invention. It is the side view which looked at the branch breaker of FIG. 1 from the right side. A heat radiating member is shown, (a) is a top view, (b) is a side view. It is explanatory drawing of the conventional distribution board for houses.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below in detail with reference to the drawings. FIG. 1 is a partial perspective view showing an example of a residential distribution board according to the present invention, and shows a relationship between a single-phase three-wire circuit and a branch breaker. In FIG. 1, 1 is a main breaker to which a lead-in line from a commercial power system is connected, 2 is a branch breaker, 3 is a conductive bar constituting a single-phase three-wire circuit L composed of two voltage lines and a neutral line. Reference numeral 4 denotes a heat radiating member, and the main breaker 1 and the branch breaker 2 are assembled to a metal panel 5 arranged at the bottom of the distribution board.

  In FIG. 1, only a pair of branch breakers 2 near the main breaker 1 is shown, and the conductive bar 3 and the heat radiating member 4 are cut in the middle. Reference numeral 6 denotes an electric circuit cover for protecting the exposed conductive bar 3, and a distribution board case (not shown), secondary wiring connected to the load side terminal 21 of the branch breaker 2, and the like are omitted. Further, in FIG. 1, the upper side of the drawing is the front of the distribution board, and the bottom portion on which the panel 5 is disposed is the wall surface side to which the distribution board is attached.

The single-phase three-wire electric circuit L is configured by arranging three conductive bars 3 so as to extend in the left-right direction. The branch breakers 2 are arranged in the upper and lower portions along the electric path L, and the power source side terminals 22 are individually connected to the conductive bars 3. The branch breaker 2 is assembled to the panel 5 and disposed on the rear surface of the distribution board case. However, in the case of a distribution board in which the electric circuit L is arranged vertically, the branch breakers 2 are also arranged vertically.
The conductive bar 3 is usually formed by punching a copper plate, and a single-phase three-wire circuit L formed by the conductive bar 3 from the secondary side terminal of the main breaker 1 is disposed. And the conductive bar 3 of the site | part by which the branch breaker 2 is arrange | positioned is arrange | positioned linearly.

  The heat dissipation member 4 is disposed between the conductive bars 3 and between the conductive bars 3 and the panel 5. 2 is a side view of the branch breaker 2 of FIG. 1 as viewed from the right side. As shown in FIG. 2, the heat radiating member 4 is in close contact with the upper and lower conductive bars 3 and in close contact with the conductive bars 3 and the panel 5. Are arranged as follows.

FIG. 3 shows the heat radiating member 4 alone, (a) is a plan view, and (b) is a side view. As shown in FIG. 3, the heat radiating member 4 is a rod-shaped body having a substantially square cross section, and is formed with a dimension matching the length and gap of the conductive bar 3 arranged in an overlapping manner, and a square member 4a made of synthetic resin is formed into a sheet shape. Insulating heat dissipation material 4b is formed.
Specifically, the space (depth) between the two spaces formed by the three conductive bars 2 is formed with the same width W1 (first width) as shown in FIG. The space W2 (second width) between the panel 5 and the panel 5 is different from the first width W1, but the heat radiating member 4 has a rectangular cross section and the height is the first width W1 and the width is the second width. By using the width W2, one type of shape is used.

  Note that the groove 41 shown in FIG. 3 is provided in order to avoid a protrusion when a screw (not shown) is screwed into the conductive bar 3, and is formed in the length direction only on one side. Also, the square member 4a is preferably made of a slightly elastic synthetic resin, which is preferable because it can be satisfactorily adhered to the conductive bar 3.

The insulating heat radiating material 4b covering the square 4a is obtained by applying an adhesive material mixed with a heat radiating member on a resin sheet. As an example, a Tera-5 sheet manufactured by TGM can be used. Specifically, this sheet has characteristics of thermal conductivity λ = 170 W / mk and thermal emissivity ε = 0.97. For example, a Tera-5 filler is mixed in a thickness of 25 μm in a resin sheet having a thickness of 6 μm. It is formed with an adhesive.
Note that the thermal conductivity of copper is λ = 398 W / mk, and the thermal conductivity of air is about 0.6 W / mk. Further, the thermal emissivity ε = 0.02 to 0.04 of copper (polished surface), the thermal emissivity ε = 0.5 of copper (oxidized surface), and the closer the heat emissivity is to 1.0, the more heat radiation High rate and easy to dissipate heat.

In this manner, by disposing the heat radiation member 4 having a thermal emissivity of 0.97, which is higher than the thermal emissivity of copper, between the conductive bars 3, the heat dissipation of the conductive bar 3 is promoted. Therefore, even if the conductive bars 3 are stacked, the temperature rise due to heat generation can be suppressed without making a major design change such as increasing the width of the conductive bars 3.
Further, by disposing the heat dissipating member 4 between the innermost conductive bar 3 and the panel 5, heat radiation of the innermost conductive bar 3 is also promoted, and heat is generated by the innermost part of the stacked conductive bar 3. Temperature rise can also be suppressed.
Furthermore, since the heat conductivity of the heat dissipating member 4 is 170 W / mk, the heat transfer between the conductive bars 3 can be carried out well by closely contacting the front and rear conductive bars 3, and the heat dissipation of the internal conductive bars 3 is most advanced. The heat can be radiated well through the conductive bar 3 of the portion, and the heat is radiated even through the panel 5 because it is in close contact with both the panel 5 and the conductive bar 3. Therefore, the heat generation at the back of the distribution board can be radiated well, and the heat can be prevented from being accumulated inside.

In the above embodiment, the heat dissipating member 4 disposed between the conductive bars 3 is in close contact with the front and rear conductive bars 3, but it is effective for heat dissipation of the conductive bar 3 only by close contact with only one of the conductive bars 3. It is. The heat radiation function of the heat radiating member 4 not only accelerates the heat radiation of the conductive bars 3 that are in close contact with each other, but also the heat of the adjacent conductive bars 3 takes the heat through the air layer, so the heat radiation is accelerated.
The same applies to the heat radiating member 4 provided between the conductive bar 3 and the panel 5, and it is effective for heat dissipation only by contacting the conductive bar 3 or the panel 5.
In the case where the heat-dissipating member 4 is in close contact with only one side as described above, the heat radiating member 4 may have a high thermal emissivity and may have a low thermal conductivity. Specifically, the thermal emissivity is preferably a value close to 1.0, but may be a value larger than that of the members constituting the conductive bar 3, and copper is used in the above embodiment. Any substance having a thermal emissivity characteristic exceeding 1 is effective. Therefore, if it is 0.5 or more, which is a value larger than the thermal emissivity of copper oxide, it is effective for suppressing heat generation of the conductive bar 3.

  Further, in the case of a configuration in which the conductive bars 3 are in close contact with each other, or a configuration in which the conductive bars 3 and the panel 5 are in close contact, it is effective if the thermal conductivity is larger than the thermal conductivity of air (λ = 0.6 W / mk). However, if it is 100 W / mk or more, heat dissipation is surely promoted, which is preferable.

  2 .... Branch breaker, 3 .... Conductive bar, 4 .... Heat dissipating member, 5 .... Panel, 5b .... Insulating heat dissipating material.

Claims (4)

A single-phase three-wire electric circuit in which a plurality of branch breakers are arranged on both sides of a single-phase three-wire electric circuit that is formed by overlapping three conductive bars and extending in a strip shape in the left-right or vertical direction. In a residential distribution board that forms a branch circuit of
A heat dissipating member is disposed between the conductive bars stacked to promote heat dissipation of the conductive bar,
The heat dissipating member is a bar whose surface is covered at least with an insulating heat dissipating material having a thermal emissivity of a specific value or more, and is disposed in close contact with at least one conductive bar. Electric board. The said branch breaker is attached to the metal panel arrange | positioned on the distribution board case back surface, The said heat radiating member is arrange | positioned also between the said electrically conductive bar of the innermost part, and the said panel, It is characterized by the above-mentioned. Item 1. A distribution board for residential use according to Item 1. The insulating heat dissipating material of the heat dissipating member disposed between the innermost conductive bar and the panel has a thermal conductivity equal to or higher than a predetermined value, and the heat dissipating member has a thickness according to the gap to be disposed. The residential distribution board according to claim 2, wherein the residential distribution board is in close contact with both the conductive bar and the panel. The insulating heat dissipating material of the heat dissipating member disposed between the conductive bars has a thermal conductivity equal to or greater than a predetermined value, and the heat dissipating member has a thickness corresponding to the interval between the conductive bars, and both the front and rear conductive bars. The residential distribution board according to any one of claims 1 to 3, wherein the residential distribution board is closely attached to the housing.

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