JP4724218B2 - Distribution board - Google Patents

Description

  The present invention relates to a distribution board.

  Conventionally, as a distribution board of this type, a main breaker, a connection bar, a conductive bar, and a branch breaker are housed in a casing, and a conductive bar disposed opposite to each other in the thickness direction. Some have a structure in which a branch breaker is plug-in connected, and a secondary terminal of the main breaker and a conductive bar are connected by a connection bar (see, for example, Patent Document 1).

  However, due to the recent reduction in size and increase in capacity of the distribution board, if the above measures are taken, the temperature inside the distribution board will increase greatly, which may cause the branch breaker to malfunction. Therefore, it is desired to reduce the temperature in the distribution board (particularly the temperature near the branch breaker) as much as possible.

Therefore, a heat transfer member for transferring the heat of the branch breaker mounting plate to the housing is interposed between the branch breaker mounting plate provided in the housing and provided with the branch breaker and the inner surface of the housing. There is a distribution board that suppresses the temperature rise around the branch breaker by transferring the heat around the breaker to the housing through the heat transfer member (see, for example, Patent Document 2).
JP 2002-10415 A JP-A-2005-287130

  However, in the distribution board in the above conventional example, the temperature of the connection bar connected to the secondary terminal of the main breaker is most likely to rise in the housing, so the heat generated in the connection bar is generated around the branch breaker on the main breaker side. As a result, the temperature of the branch breaker in the vicinity of the main breaker rises, the bimetal included in the branch breaker operates due to the temperature rise, and the branch breaker may malfunction.

  The present invention has been made in view of the above reasons, and its purpose is to suppress distribution of heat generated in the connection bar to the vicinity of the branch breaker and to prevent malfunction due to temperature rise of the branch breaker. Is to provide.

  In the invention of claim 1, one end is connected to the main breaker, the load side terminal of the main breaker, and a plurality of connection bars juxtaposed along the width direction are connected to the other end of the connection bar, respectively. A plurality of elongated conductive bars, a plurality of branch breakers that are arranged in parallel in the longitudinal direction of the conductive bars and are respectively connected to the conductive bars, and are disposed to face the widthwise surfaces of the connection bars. A hollow box-shaped housing having a plate member and a heat transfer member that transmits heat of the connection bar to the plate member by having one end surface in contact with the plate member and the other end surface in contact with the connection bar. And

  According to the present invention, heat transmitted from the connection bar to the branch breaker is transmitted from the connection bar by radiating the heat generated in the connection bar that is most likely to rise in the distribution board to the plate member via the heat transfer member. This can be suppressed and malfunction due to the temperature rise of the branch breaker can be prevented.

  The invention according to claim 2 is the invention according to claim 1, wherein the heat transfer member includes a metal heat transfer block, a space between one end surface of the heat transfer block and the plate member, and the other of the heat transfer blocks. It is characterized by comprising an insulating sheet interposed between at least one of the end face and the connection bar.

  According to the present invention, insulation between the connection bar and the plate member can be ensured without impairing heat dissipation from the connection bar to the plate member, and an electric shock accident or leakage can be prevented.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the side surface of the heat transfer member is covered with a resin casing.

  According to the present invention, it is possible to prevent an electric shock from accidentally touching the heat transfer member, or a leakage current caused by a screw or the like being sandwiched between the heat transfer block and the plate member or the connection bar. Can do.

  According to a fourth aspect of the invention, in the invention of the third aspect, the casing is screwed and fixed to at least one of the plate member and the connection bar, and the dimension between both end faces of the heat transfer member is opposed to the connection bar. It is more than the dimension from the surface of the casing to the surface of the casing facing a plate member.

  According to this invention, since the heat transfer member can be securely sandwiched between the plate member and the connection bar, the reliability of heat transfer can be further improved.

  As described above, according to the present invention, there is an effect that heat generated in the connection bar can be prevented from being transmitted to the vicinity of the branch breaker, and malfunction of the branch breaker can be prevented.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment)
The distribution board in this embodiment is demonstrated using FIGS. Hereinafter, the vertical and horizontal directions in FIG. 2 are used as a reference, and the direction orthogonal to the vertical and horizontal directions is the front and rear direction.

As shown in FIGS. 1 and 2, the distribution board in the present embodiment is a board body 1, a main breaker 2 disposed in the board main body 1, and secondary terminals 2 b ₁ , ₂ b 2 of the main breaker _2. 2b ₃ , three connection bars 31, 32 and 33, one end of which is connected to each other, a neutral electrode bar 41 (conductive bar 41) to which the other ends of the connection bars 31, 32 and 33 are respectively connected, a voltage electrode The bar 42 (conductive bar 42), the voltage electrode bar 43 (conductive bar 43), and one end of each of the three conductive bars 41, 42, 43 formed from a non-conductive material such as resin are insulated. A supporting member 5 that is supported, a supporting base 6 that is formed of a non-conductive material such as a resin and that is supported in a state where the other ends of the conductive bars 41, 42, and 43 are insulated from each other; Provided for neutral electrode bar 41 and voltage electrode bar 42 or voltage electrode And a plurality of branch breakers 7 over 43 and are connected to each pole. When the connection bars 31, 32, and 33 are not distinguished from each other, they are referred to as the connection bar 3, and when the connection bars 41, 42, and 43 are not distinguished from each other, they are referred to as the conduction bar 4.

  First, the panel body 1 is composed of a housing 11 and a lid (not shown) that covers the housing 11, and the housing 11 has a peripheral wall 11b that protrudes substantially vertically from the periphery of a rectangular bottom plate 11a so that the entire surface is covered. It is formed in an open substantially rectangular box shape. In addition, spacers 12 that are formed in a substantially cylindrical shape by resin or the like are fixed to the four corners of the bottom plate 11a, and a pair of long brackets 13 that are long in the vertical direction are disposed via the spacers 12. . A plurality of screw holes 13 a are provided in the bracket 13 in the front-rear direction along the vertical direction, and a bracket 14 having a substantially U-shaped cross section for installing the main breaker 2 is disposed above the pair of brackets 13. , 15 are installed between the brackets 13 with a predetermined interval with the open ends facing rearward, and the flange portions 14a, 15a formed on the open ends are fixed to the brackets 13 by screwing. Furthermore, an intermediate plate 16 on which the branch breaker 7 is disposed is installed below the pair of brackets 13 and fixed to the bracket 13 by screwing.

The main breaker 2 is provided with three-pole primary terminals 2a ₁ , 2a ₂ , and 2a ₃ to which a three-wire power line (not shown) is connected and 100 / 200V power is supplied. Here, the central primary terminal 2a ₁ is a neutral pole to which a neutral wire from an external power source is connected, and the primary terminals 2a ₂ and 2a ₃ on the left and right sides thereof are connected to a voltage line from the external power source. It is a voltage pole. At the other end of the main breaker 2, three-pole secondary terminals 2b ₁ , 2b ₂ , 2b ₃ connected to the three conductive bars 41, 42, 43 via the connection bars 31, 32, 33 are provided. is disposed, the center of the secondary terminals 2b ₁ is a neutral polar, secondary terminals 2b 2 of the left and right _sides, 2b ₃ has a voltage polarity. The primary terminals 2a ₁ , 2a ₂ , 2a ₃ of the main breaker 2 are referred to as primary terminals 2a when not distinguished from each other, and the secondary terminals 2b ₁ , 2b ₂ , 2b ₃ are distinguished from secondary terminals 2b when not distinguished from each other. Call it. In addition, an operation handle portion 2c for switching between conduction and interruption between the primary terminal 2a and the secondary terminal 2b is provided at substantially the center of the front surface of the main breaker 2, and the rear surface faces the brackets 14 and 15. The primary terminal 2a side of the rear surface is fixed to the intermediate plate 14 by screwing, and the secondary terminal 2b side of the rear surface is fixed to the bracket 15 by screwing.

  Next, the conductive plate 4, the support member 14, the support base 15, and the branch breaker 5 are disposed on the intermediate plate 16.

The conductive bar 4 is formed in a long shape having a width corresponding to the current capacity from a flat conductor such as copper, and two insertion holes (not shown) through which the screws 17 are inserted are provided along the short direction. The two conductive bars 41, 42, and 43 are disposed to face each other with a gap along the thickness direction, and are disposed at the approximate center of the intermediate plate 16 with the longitudinal direction directed to the longitudinal direction of the housing 11. . Here, the neutral electrode bar 41 is disposed between the voltage electrode bars 42 and 43, and the voltage electrode bar 42 is disposed on the front side of the neutral electrode bar 41. Furthermore, neutral pole bar 41 is connected to the neutral pole 2b ₁ of the main breaker 2 via a connecting bar 31, the main breaker 2 via respective voltage electrode bars 42, 43 connecting bars 32, 33 The voltage electrodes 2b ₂ and 2b ₃ are connected respectively. One end of each conductive bar 4 in the longitudinal direction is supported and fixed to the support member 5, and the other end is supported and fixed by a pair of support bases 6.

  The support member 5 is disposed at one end of the conductive bar 4, and one end of the conductive bar 4 is supported through a gap in the thickness direction. On the support member 5, one end of the conductive bar 4 and the other end of the connection bar 3 are electrically connected by being fastened together by screwing.

The support base 6 is disposed at the other end of the conductive bar 4, and the other end of each conductive bar 4 is supported via a gap in the thickness direction, and is separated and insulated. The branch breaker 7 has a conductive bar on one side surface. Three notch portions (not shown) to which 4 is fitted are provided, and two of them are provided with a power supply terminal portion (not shown) connected to the conductive bar 4. And the load side terminal part 7a connected to an external load etc. is provided in the other end side surface of the branch breaker 7. FIG. Further, on the front surface of the branch breaker 7, there is provided an operation handle portion 7 b that conducts and cuts off between the terminals of the power supply side terminal portion and the load side terminal portion 7 a. Further, a plurality of branch breakers 7 are arranged in parallel with the power supply terminal portion facing each long side of the conductive bar 4 along the lengthwise direction of the conductive bar 4, and are connected to the two electrodes of the power supply terminal portion. Are connected by plug-in to the neutral electrode bar 41 and the voltage electrode bar 42 or the voltage electrode bar 43, respectively.

And as for connection bar 31,32,33 which connects the electrically conductive bar 4 and the secondary side (load side) terminal 2b of the main breaker 2, the upper end is the secondary terminal 2b ₁ of the main breaker 2 as shown in FIG. , _2b 2, 2b ₃ one long in the vertical direction are each connected at one 31a, 32a, 33a and, on the other hand pieces 31a, 32a, is extended from the lower end of 33a rightward end conductive bars 41 and 42, 43 is formed in a substantially L shape from the other pieces 31b, 32b, 33b connected to the upper end of 43, respectively.

  As shown in FIG. 1, a single plate member 8 is disposed between the rear surfaces of the connection bars 31, 32, and 33 and the housing 1, and the plate member 8 and the connection bar 31 are further disposed. , 32, and 33, the heat transfer members 9A, 9B, and 9C having the front end surface in contact with the connection bars 31, 32, and 33, the rear end surface in contact with the plate member 8, and the side surfaces covered with the casing 10, respectively. Is provided. The heat transfer members 9A, 9B, and 9C are referred to as heat transfer members 9 when not distinguished from each other.

  The plate member 8 is made of a metal plate material, is disposed above the intermediate plate 16, is laid on the pair of brackets 13, and is fixed by screwing. In the present embodiment, the plate member 8 is made of metal, but other materials may be used as long as the material has high thermal conductivity.

  The casing 10 is formed of a resin material, and has three storage portions 10A, 10B, and 10C that are divided and insulated from each other by two partition walls 110 and 111, as shown in FIG. 9C is stored in a state of being isolated from each other. Further, a flange portion 10d having a plurality of insertion holes 10e is formed on the peripheral edge of the bottom surface of the casing 10, and screws 19 inserted through the insertion holes 10e are formed in the plate member 8 as shown in FIG. The casing 10 is fixed to the plate member 8 by being screwed into a screw hole (not shown) provided.

  The heat transfer members 9A, 9B, and 9C include metal heat transfer blocks 91A, 91B, and 91C, and insulating sheets 92A, 92B, and 92C that are provided on the rear surfaces of the heat transfer blocks 91A, 91B, and 91C and have elasticity. Composed. When the heat transfer blocks 91A, 91B, and 91C are not distinguished, they are referred to as the heat transfer block 91, and when the insulation sheets 92A, 92B, and 92C are not distinguished, they are referred to as the insulation sheet 92. And since the accommodating part 10A, 10B, 10C of the said casing 10 is perforated | pierced in the front-back direction, as for the heat-transfer member 9, the rear surface opposes the plate member 8, and the front surface opposes the connection bar 3. Yes. Further, step portions 10a, 10b, and 10c are formed on the lower surface side periphery of the storage portions 10A, 10B, and 10C, and the insulating sheets 92A, 92B, and 92C are fitted therein.

  Then, as shown in FIG. 5A, the screw 18 inserted through the insertion hole 3 a formed in the connection bar 3 is drilled in the screw hole 91 a drilled in the heat transfer block 91 and the casing 10. The heat transfer member 9 is sandwiched between the connection bar 3 and the plate member 8 by being respectively screwed into the screw holes 10f. At that time, the dimension L1 between the front and rear end faces of the heat transfer member 9 is changed from the surface of the casing 10 facing the connection bar 3 (front surface of the casing 10) to the surface of the casing 10 facing the plate member 8 (rear surface of the casing 10). Therefore, the front end surface of the heat transfer member 9 is in close contact with the connection bar 3, and the rear end surface of the heat transfer member 9 is in close contact with the plate member 8. Further, as shown in FIG. 5B, when the screw 18 is tightened, the insulating sheet 92 having elasticity is compressed by the heat transfer block 91 and is in close contact with the plate member 8, and the heat transfer block 91. Is biased to the front connection bar 3. Therefore, the heat transfer member 9 has a high degree of adhesion to the connection bar 3 and the plate member 8, and can efficiently transfer the heat of the connection bar 3 to the plate member 8.

  With the above configuration, in the distribution board in the present embodiment, the heat generated from each connection bar 3 during energization is transmitted to the plate member 8 via the heat transfer member 9 and radiated, so that the connection bar 3 An increase in temperature can be suppressed, and heat generated in the connection bar 3 can be suppressed from being transmitted to the periphery of the branch breaker 7. Therefore, the temperature rise of the branch breaker 7 can be suppressed, and the branch breaker 7 can be prevented from malfunctioning.

  And since the insulating sheet 92 is provided between the metal block 91 and the plate member 8, the connection bar 3 and the plate member 8 are insulated without impairing heat dissipation, and an electric shock accident or leakage occurs. Can be prevented. Moreover, since the side surface of the heat transfer member 9 is covered with the casing 10, the heat transfer member 9 is not accidentally touched, and an electric shock can be prevented. Furthermore, the heat transfer block 91 and the connection bar can be prevented. 3 or the plate member 8 can prevent a leak from occurring by inserting a screw or the like.

  In the present embodiment, the insulating sheet 92 is provided between the heat transfer block 91 and the plate member 8, but between the heat transfer block 91 and the plate member 8, the heat transfer block 91 and the connection bar 3 It should just be provided in at least any one between. Further, in the present embodiment, the casing 10 is screwed and fixed to the connection bar 3, but may be screwed to at least one of the connection bar 3 and the plate member 8.

The principal part enlarged view of the distribution board in embodiment of this invention is shown. An overall view of the distribution board is shown. (A)-(d) shows the 4th page of the casing in the same as the above. The principal part enlarged view of the distribution board in the same as the above is shown. (A), (b) shows the attachment state of the heat transfer member of the distribution board in the same as above, (a) shows before screw fixation, (b) shows after screw fixation.

Explanation of symbols

2 Main breaker 2b Load side terminal 7 Branch breaker 8 Plate members 9A to 9C Heat transfer member 11 Housings 31 to 33 Connection bars 41 to 43 Conductive bar

Claims (4)

With the main breaker,
A plurality of connection bars each connected at one end to the load side terminal of the main breaker and juxtaposed along the width direction;
A plurality of elongated conductive bars each connected to the other end of the connection bar;
A plurality of branch breakers arranged in parallel in the longitudinal direction of the conductive bar and connected to the conductive bar;
A plate member disposed to face a surface in the width direction of the connection bar;
A distribution board comprising: a heat transfer member that transmits heat of the connection bar to the plate member by having one end surface in contact with the plate member and the other end surface in contact with the connection bar; .   The heat transfer member is at least one of a metal heat transfer block, between one end surface of the heat transfer block and the plate member, and between the other end surface of the heat transfer block and the connection bar. The distribution board according to claim 1, comprising an insulating sheet interposed.   The distribution board according to claim 1, wherein a resin casing is provided on a side surface of the heat transfer member.   The casing is screwed and fixed to at least one of the plate member and the connection bar, and the dimension between both end faces of the heat transfer member extends from the surface of the casing facing the connection bar to the surface of the casing facing the plate member. The distribution board according to claim 3, wherein the distribution board is not less than the dimension.

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