JP2009268252A - Distribution board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a distribution board capable of preventing the spread of fire in a main breaker due to a malfunction in installing a power line and capable of achieving cost reduction. <P>SOLUTION: The distribution board includes: a main breaker 2 with a primary side terminal part 21 connected to the power line L, a secondary side terminal part 22 electrically connected to a branch joint part 4 serving as or part of a bus-bar, and an open/close mechanism part for opening and closing an electrical circuit between the primary side terminal part 21 and the secondary side terminal part 22; branch breakers 3 connected to the branch joint part 4; and a box-like cabinet 1 with a resin box 10 having an opening 10a on the front and housing the main breaker 2 and the branch breakers 3. The bottom of the box 10 is mounted with a fixation part 13 in which the main breaker 2 is fixed in a predetermined direction. A plate 15 for fire prevention made of metal material is intervened between the primary side terminal part 21 of the main breaker 2 and the inside surface 10e of the box facing the primary side terminal part 21. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a distribution board, and more particularly to a residential distribution board installed in a house.

  Conventionally, as a distribution board, a distribution board for housing (mainly used as an entrance device for a house, etc.) in a single-phase two-wire 100V or single-phase three-wire 100 / 200V circuit of AC 50 Hz or 60 Hz. Is also provided).

  This type of distribution board is used as a main circuit breaker (main switch) or a branch circuit (branch line) that branches from the main circuit (bus) connected to the secondary side of the main circuit breaker and supplies power to the electrical equipment. A plurality of internal devices such as a branch breaker (branch switch) provided respectively, and a cabinet in which the internal devices are housed (incorporated) (see, for example, Patent Document 1).

The cabinet (casing) of the distribution board shown in the above Patent Document 1 includes a body (box) that houses a plurality of internal devices including a main breaker and a branch breaker, and a cover that is coupled to the front side of the body. The body and the cover are both synthetic resin molded products.
Japanese Patent No. 3622605

  By the way, the main breaker used in the distribution board is provided with a primary side terminal part as a terminal part for power supply connection. For example, such a primary side terminal part is connected to a dwelling unit from a pole transformer. The drawn single-phase three-wire low-voltage distribution line is connected.

  Here, if the connection between the power line such as the low voltage distribution line and the primary terminal part is loose, or if the primary terminal part is a screw terminal, you may forget to tighten the screw and the power line and the primary terminal part will be If it is connected incompletely, that is, if a problem occurs when the power line is installed, the primary side terminal of the main breaker or the power line may be abnormally overheated, resulting in a fire at the main breaker. (The main breaker ignited).

  In the distribution board shown in Patent Document 1, since the box and the cover constituting the cabinet (housing) are both synthetic resin molded products, the fire generated in the main breaker burns out to the box and the cover, that is, There was a risk that the fire that occurred in the main breaker could spread to the cabinet. Such a problem can be suppressed by using a metal cabinet rather than a synthetic resin, but the metal cabinet is more expensive than the synthetic resin. There is. In addition, metal cabinets are relatively unhealthy because they are relatively heavy, and the degree of freedom in setting the shape is low compared to those made of synthetic resin. There was a demand to use a synthetic resin.

  The present invention has been made in view of the above-described points, and its purpose is to suppress the spread of a fire generated in the main breaker due to a problem when the power line is attached, and to reduce the cost. It is to provide a distribution board that can be used.

  In order to solve the above-mentioned problem, in the invention of claim 1, a primary side terminal part to which a power line for connecting an external power source is connected, a secondary side terminal part to which a bus line is connected, and a primary side end terminal part A plurality of internal devices including a main circuit breaker including an opening / closing mechanism that opens and closes an electric circuit between the terminal and the secondary terminal portion, and the plurality of internal devices formed in a box shape having an opening on the front surface by a synthetic resin A cabinet having a box for storing the main body, and a fixed portion to which the main breaker is fixed in a predetermined direction is provided on a bottom surface of the box, and the primary side terminal portion of the main breaker is opposed to the primary side terminal portion. A fireproof part made of a metal material is interposed between the inner surface of the box.

  According to the invention of claim 1, a fire occurs in the main breaker due to abnormal heating caused by incomplete connection of the power line to the primary terminal portion of the main breaker (failure when the power line is attached). However (even if the main breaker ignites), the fire generated by the main breaker becomes difficult to hit the inner surface of the box, and the temperature rise of the box is suppressed, so the fire generated by the main breaker spreads to the box This can be suppressed. Further, since the cabinet box is made of synthetic resin, the cost can be reduced as compared with the case of using a metal box.

  According to a second aspect of the invention, in the first aspect of the invention, a cover made of synthetic resin is attached to the front side of the box so as to close the opening of the box, and the cover is the primary of the main breaker. The site | part facing a side terminal part is formed in the shape located ahead of the site | part facing the said secondary side terminal part, It is characterized by the above-mentioned.

  According to the invention of claim 2, a fire occurs in the main breaker due to abnormal heating caused by incomplete connection of the power line to the primary terminal portion of the main breaker (failure when installing the power line). However, since the fire generated in the main breaker becomes difficult to hit the cover and the temperature rise of the cover is suppressed, it is possible to suppress the fire generated in the main breaker from spreading to the cover. Further, since the cabinet cover is made of synthetic resin, the cost can be reduced as compared with the case of using a metal cover.

  INDUSTRIAL APPLICABILITY According to the present invention, it is possible to suppress the spread of a fire that has occurred in the main breaker due to a problem when the power supply line is attached, and it is possible to reduce the cost.

  A distribution board according to an embodiment of the present invention is a residential distribution board. As shown in FIGS. 1 and 2, a cabinet breaker 2 and a plurality of branch breakers 3 are incorporated in a cabinet 1 as internal devices. It becomes. In the following description, for simplification of description, the right side in FIG. 3B is defined as the front side of the cabinet 1, and the left side in FIG. Similarly, the upper part in FIG. 3A is defined as the upper part of the cabinet 1, and the lower part in FIG. However, this is not intended to limit the installation direction of the cabinet 1.

  As shown in FIG. 1A, the main breaker 2 includes a rectangular parallelepiped box-shaped casing 20, and one end side (upper end side) in the longitudinal direction on the front side of the casing 20 (the right side in FIG. 1B). ) Is provided with a plurality (two in this embodiment) of primary side terminal portions (power source side terminal portions) 21 made of screw terminals. A power line (electric wire) L for connecting an external power source is connected to each primary side terminal portion 21. The power line L is, for example, a single-phase three-wire low-voltage distribution line (a voltage pole with an AC potential of 100 V or a voltage pole with an AC potential of −100 V) drawn into a dwelling unit from a pole transformer (not shown). is there. Therefore, the distribution board of this embodiment can supply 200V AC power.

  On the other end side (lower end side) in the longitudinal direction on the front side of the housing 20, there are a plurality of secondary side terminal portions (load side terminal portions) 22 made of screw terminals corresponding to the respective primary side terminal portions 21 (see FIG. Two are provided in the example shown). The housing 20 incorporates an opening / closing mechanism (not shown) that opens and closes an electric circuit between the primary terminal portion 21 and the secondary terminal portion 22 corresponding to the primary terminal portion 21. On the front side of the body 20, a handle 23 for operating the opening / closing mechanism is provided. The above open / close mechanism section is used when an overcurrent (overload current or short-circuit current) flows in the electric circuit between the primary terminal section 21 and the secondary terminal section 22 or when a leakage current occurs (that is, an abnormal current is generated). When this occurs, the electrical circuit is interrupted. Since the above-mentioned opening / closing mechanism part can adopt a conventionally known one, a detailed description thereof will be omitted.

  A branch connection portion 4 for branch connection of the branch breaker 3 is connected to the secondary side terminal portion 22 of the main breaker 2. The branch connection portion 4 includes a pair of voltage electrode conductive bars 40 and a neutral electrode conductive bar 41 formed of a metal plate. In the distribution board of this embodiment, the neutral electrode conductive bar 41 is not used.

  The pair of voltage electrode conductive bars 40 and the neutral electrode conductive bar 41 are arranged in parallel to each other. In order to connect the branch breaker 3, a plurality of branch conductive bars (not shown) project from the edge on one end side in the width direction (short direction) of the voltage electrode conductive bar 40. The branch conductive bars are arranged along the longitudinal direction of the voltage electrode conductive bar 40. On the other hand, in the conductive bar 41 for the neutral electrode, both edges in the width direction (short direction) are used for connection of the branch breaker 3. Accordingly, a plurality of branch breakers 3 are connected to each conductive bar 40, 41 in a line along the longitudinal direction of each conductive bar 40, 41 (left-right direction in FIG. 1A).

  Each of the pair of voltage electrode conductive bars 40 described above has a bar 24 extending over each of the pair of secondary side terminal portions 22 whose one end side in the longitudinal direction (the left end side in FIG. 1A) is the voltage electrode of the main breaker 2. Connected through. Therefore, in the present embodiment, the pair of voltage electrode conductive bars 40 and the crossing bar 24 constitute a bus that becomes a main electric circuit and a branch line that becomes a branch electric circuit that branches from each main electric circuit. The transition bar 24 is formed of a metal plate, and is handled integrally with the main breaker 2 by being connected to the secondary side terminal portion 22 of the main breaker 2 in advance. A safety cover 25 that covers the primary side terminal portion 21, the secondary side terminal portion 22, and each crossing bar 24 can be attached to the front side of the main breaker 2. As a result, when the branch breaker 3 is connected to the branch connection portion 4, it is possible to prevent a human hand from touching the primary side terminal portion 21, the secondary side terminal portion 22, and the crossing bar 24 of the main breaker 2. ing.

  The branch breaker 3 is connected to a plurality of (three) power supply side connection portions (see FIG. 5) connected to the edge portions in the width direction of the branch conductive bar or neutral electrode conductive bar 41 provided in the voltage electrode conductive bar 40. The housing 30 is provided with a load-side connection portion 31 to which an electric wire (not shown) of an electric device (load) is connected. Of the three power supply side connection portions, only two are actually used, and in the case of this embodiment, they are connected to the two voltage electrode conductive bars 40. The housing 30 of the branch breaker 3 incorporates an open / close mechanism (not shown) that opens and closes the electric path between the power supply side connection portion and the load side connection portion 31. A handle 32 for operating the opening / closing mechanism is exposed. The open / close mechanism cuts off the electric circuit when an overcurrent flows in the electric circuit between the power supply side connection unit and the load side connection unit 31 or when a leakage occurs (that is, when an abnormality occurs). Since this type of opening / closing mechanism can be a conventionally known one, a detailed description thereof will be omitted.

  As shown in FIGS. 1 to 3, the cabinet 1 is formed in a flat rectangular box shape having an open front surface (having an opening 10 a on the front surface), and accommodates internal devices such as a main breaker 2 and a branch breaker 3. A box 10, a cover 11 attached to the front side of the box 10 so as to close the opening 10 a, and a door 12 attached to the cover 11. The box 10, the cover 11, and the door 12 are all formed of a synthetic resin (synthetic resin material) (a synthetic resin molded product). In addition, as said synthetic resin, it is preferable to employ | adopt what has comparatively high flame retardance among synthetic resins.

  In the center of the bottom surface of the box 10, an opening 10b having a rectangular shape (a rectangular shape in which the longitudinal direction of the box 10 is the longitudinal direction of the box 10) is provided. The opening 10b is used for applications such as inserting a power line L or an electric wire (not shown) of an electrical device into the cabinet 1 (box 10). A plurality of opening edges on both sides of the opening 10b in the short direction (vertical direction in FIG. 1A) are provided along the longitudinal direction of the opening 10b (left and right in FIG. 1A). Screw holes 10c are arranged in a row. Also, a plurality of screw holes 10d are provided at the opening edge portions on both sides in the longitudinal direction of the opening portion 10b.

  A rectangular mounting plate to which the main breaker 2 is fixed on the bottom surface of the box 10 in a predetermined orientation (in this embodiment, the primary terminal portion 21 is on the upper side and the secondary terminal portion 22 is on the lower side). A fixing part 13 (indicated by reference numeral 13A as necessary) is provided. Further, the branch connection portion 4 is fixed to the bottom surface of the box 10 in a predetermined direction (the direction in which the longitudinal direction of the voltage electrode conductive bar 40 and the neutral electrode conductive bar 41 is the same as the longitudinal direction of the box 10). The fixed part 13 (it represents with the code | symbol 13B below as needed) which consists of a rectangular-shaped attachment board is provided. Therefore, the branch breaker 3 is connected to the branch connection portion 4 in such a form that the longitudinal direction of the housing 30 is along the short direction of the box 10 (the load side connection portion 31 faces the inner side surface of the box 10 on the short side direction). Connected.

  Fixing pieces 13 a used for fixing the fixing part 13 to the box 10 are formed at the four corners of each fixing part 13. Each fixing piece 13a is provided with an insertion hole 13b for a fixing screw S1 for fixing the fixing portion 13 by screwing or the like.

  In attaching such a fixing portion 13 to the box 10, a long plate-like bridge portion 14 is used. The bridge portion 14 crosses the opening portion 10b in the short direction by screwing a fixing screw S2 through which screw insertion holes (not shown) provided at both ends in the longitudinal direction are inserted into the screw hole 10c. It is constructed between the opening edges of the opening 10b in the form. The bridge portion 14 is provided with a screw hole (not shown) corresponding to the fixing screw S1, and each fixing portion 13 has the fixing screw S1 inserted through the insertion hole 13b of each fixing piece 13a. By screwing into the screw holes 10d and the screw holes of the bridging portion 14, as shown in FIG. 1A, the screw holes 10d are attached to the box 10 so as to be positioned on the opening portions 10b.

  By the way, in the box 10 of the cabinet 1, the fire prevention plate 15 used as the fire prevention part for preventing a fire from spreading to the box 10 is provided. The fire prevention plate 15 is made of a metal (metal material) such as iron, and includes a fire wall 150 as shown in FIGS. The fire wall 150 is formed between the primary side terminal portion 21 of the main breaker 2 and the inner side surface (upper inner side surface) 10d of the box 10 facing the primary side terminal portion 21, and the inner side surface 10e and the inner side surface. 10e and the length which can be located both between the load side connection part 31 of the branch breaker 3 which opposes. In addition, the fire wall 150 is formed in a cross-sectional square shape in which the rear end side portion is inclined so as to be separated from the inner side surface 10e of the box 10 toward the rear end side. This is because the internal shape of the box 10 is taken into consideration, and is not necessarily intended to be formed in a cross-sectional shape. Further, the fire protection plate 15 is not necessarily formed of iron, and may be other metals.

  An attachment portion 151 for attachment to the box 10 is integrally provided at the rear end portion (the left end portion in FIG. 4B) of the fire wall 150. The attachment portion 151 includes a pair of holding pieces 151a for holding the opening edge portion in the short direction of the opening 10b of the box 10 and a connecting piece 151b for integrally connecting the pair of holding pieces 151a. It is formed in a letter shape. Further, a screw insertion hole 151c for the fixing screw S3 is formed on both the pair of holding pieces 151a so as to overlap in the front-rear direction. Such a fire protection plate 15 holds the opening edge in the short direction of the opening 10b between the pair of holding pieces 151a of the mounting portion 151, and is a fixing screw through which the screw insertion hole 151c is inserted. It is attached to the box 10 by screwing S3 into the screw hole 10c.

  And in the state attached to the box 10, the fire wall part 150 of the fire prevention plate 15 is the primary side terminal part 21 of the main breaker 2, and the inside of the box 10, as shown to FIG. 1 (a), (b). It is interposed between the side surface 10e and is interposed between the inner side surface 10e and the load side connection portion 31 of the branch breaker 3 facing the inner side surface 10e. In addition, although the notch part 152 is formed in the plate 15 for fire prevention in this embodiment, since this is for preventing the contact with the bridge part 14, if there is no possibility of contacting with the bridge part 14 The notch 152 is not necessary.

As shown in FIGS. 2A and 2B, the cover 11 serves as an inner lid of the cabinet 1 and has a rectangular plate shape that can close the opening on the front side of the box 10. It has the formed front wall part 11a. A window hole 11b for exposing the handle 23 of the main breaker 2 and a window hole 11c for exposing the handle 32 of the branch breaker 3 are opened in the front wall portion 11a of the cover 11. Thus, the main breaker 2 and the branch breaker 3 can be operated without removing the cover 11 from the box 10. Further, a bearing portion 11 d for attaching the door 12 is formed on one end side in the short direction of the front wall portion 11 a of the cover 11. As shown in FIG. 2B, the front wall portion 11a of the cover 11 is a portion on one end side (end side) in the short direction from the substantially central portion in the short direction (vertical direction in FIG. 2B), In other words, a portion 11a ₁ of the cover 11 that faces the primary side terminal portion 21 of the main breaker 2 is formed in a shape that separates from the bottom surface of the box 10 toward the one end side in the short side direction (a shape that separates from the main breaker 2). . That is, the cover 11, portions 11a ₁ opposite to the primary-side terminal portion 21 of the master breaker 2 becomes formed in a shape which is located forward of the portion 11a ₂ that faces the secondary terminal portion.

  As shown in FIGS. 3A and 3B, the door 12 is formed in a rectangular plate shape that covers the front wall portion 11 a of the cover 11. The door 12 is provided with a shaft portion 12a pivotally supported by the bearing portion 11d of the cover 11, whereby the door 12 is attached to the cover 11 so as to be freely opened and closed (see FIGS. 2 and 3).

  As described above, the distribution board according to the present embodiment includes the primary terminal portion 21 of the main breaker 2 in the box 10 formed in the cabinet 1 in the box shape having the opening 10a on the front surface by the synthetic resin. And a fire prevention plate 15 made of a metal material interposed between the primary side terminal portion 21 and the inner side surface 10e of the box 10 facing the primary side terminal portion 21.

  Therefore, according to the distribution board of the present embodiment, the main breaker is caused by abnormal heating caused by incomplete connection of the power source line to the primary side terminal portion 21 of the main breaker 2 (failure when the power source line is attached). 2 (even if the main breaker 2 or the like is ignited), the fire generated in the main breaker 2 becomes difficult to hit the inner surface 10e of the box 10, and the temperature rise of the box 10 is suppressed. It is possible to suppress the fire generated in the main breaker 2 from spreading to the box 10. Moreover, since the box 10 of the cabinet 1 is made of synthetic resin (synthetic resin molded product), the cost can be reduced and the weight can be reduced as compared with the case of using a metal one. There is also an advantage that the setting can be easily performed.

  In addition, the fire-protection plate 15 in the present embodiment includes a mounting portion 151 having a pair of holding pieces 151a for holding the opening edge portion in the short direction of the opening portion 10b of the box 10. The fixing screw S3 into which the screw insertion hole 151c provided in the holding piece 151a is inserted is screwed into the screw hole 10c of the box 10, so that it can be attached to the box 10. That is, the fire protection plate 15 in the present embodiment can be attached to the box 10 using the screw hole 10c originally provided in the box 10 of the cabinet 1, so that it is not necessary to replace the box 10, and the existing component It can be retrofitted to the box 10 of the cabinet 1 of the electrical panel.

  Further, the cover 11 of the cabinet 1 is formed so that the portion 11b facing the primary side terminal portion 21 of the main breaker 2 is positioned in front of the portion 11c facing the secondary side terminal portion 22. The gutter of the primary side terminal portion 21 of the main breaker 2 becomes wide, and even if a fire occurs in the main breaker 2 due to a problem when the power supply line is attached, the fire generated in the main breaker 2 becomes difficult to hit the cover 11. As a result, the fire that has occurred in the main breaker 2 can be prevented from spreading to the cover 11. Moreover, since the cover 11 of the cabinet 1 is made of a synthetic resin, the cost can be reduced and the weight can be reduced and the shape can be easily set as compared with the case of using a metal cover. There is also an advantage of becoming.

  By the way, the distribution board of the present embodiment is merely one embodiment of the present invention, and is not intended to limit the present invention to the distribution board of the present embodiment, and does not depart from the spirit of the present invention. Of course, changes can be made. For example, the outer shape and internal structure of the cabinet 1 are not limited to those shown in the drawings. In the cabinet 1, the box 10 is indispensable, but the cover 11 and the door 12 are optional, and the cover 11 and the door 12 may not be provided. Further, in the illustrated example, two primary side terminal portions 21 are provided, but the number of primary side terminal portions 21 is 2 connected to two voltage electrodes (AC potential is 100 V and −100 V) of the low voltage distribution line. In addition to the three, three may be included including those connected to the neutral electrode (the electric potential is 0 V). In this case, the distribution board can supply AC power according to the potential difference between the power lines, specifically, 100V AC power or 200V AC power. Moreover, the internal device of a distribution board should just contain the main circuit breaker 2, and may include the earth-leakage circuit breaker different from the main circuit breaker 2 and the branch breaker 3, and the circuit breaker for wiring. The configuration of the connection unit 4 is not limited to the above example.

The distribution board of one Embodiment of this invention is shown, (a) is a front view which shows an internal structure, (b) is the schematic sectional drawing which abbreviate | omitted one part. The state which opened the door in the distribution board same as the above is shown, (a) is a front view, (b) is a side view. The state which closed the door in the same electricity distribution panel is shown, (a) is a front view, (b) is a side view. The fire prevention plate in the same as above is shown, (a) is a front view, (b) is a side view, and (c) is a bottom view.

Explanation of symbols

1 cabinet 2 main breaker (internal equipment)
3 Branch breaker (internal equipment)
4 branch connection part 10 box 10a opening 10e inner surface 11 cover 11a ₁ part (part facing the primary side terminal part of the main breaker)
11a ₂ sites (sites facing the secondary terminal of the main breaker)
13 fixed part 15 fire prevention plate (fire prevention part)
21 Primary terminal 22 Secondary terminal L Power line

Claims (2)

Primary side terminal part to which the power line for external power supply connection is connected, secondary side terminal part to which the bus line is connected, and an open / close mechanism that opens and closes the electric circuit between the primary side terminal part and the secondary side terminal part A plurality of internal devices including a main breaker provided with a portion, and a cabinet having a box formed of a synthetic resin in a box shape having an opening on the front surface and storing the plurality of internal devices,
On the bottom of the box, there is a fixed part where the main breaker is fixed in a predetermined direction,
A distribution board characterized in that a fire prevention portion made of a metal material is interposed between a primary side terminal portion of the main breaker and an inner side surface of the box facing the primary side terminal portion. Provided with a cover made of synthetic resin attached to the front side of the box so as to close the opening of the box,
The cover is formed so that a portion facing the primary terminal portion of the main breaker is positioned in front of a portion facing the secondary terminal portion. Distribution board.

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