JPS6237370Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a power distribution device, more specifically, a branch box for passing a single-phase three-wire bus bar used in a distribution board, and two types of breakers with different rated voltages connected to this branch box. It is related to the connection structure.

Conventionally, for example, as shown in FIG. 1, each phase line (S, R, T) in a single-phase three-wire branch box 8
When connecting two types of breakers 4a and 4b with different rated voltages such as 100V and 200V, please refer to Figures 2 and 3.
As shown in the figure, the bus bar 2 and breakers 4a, 4
One of the Z-shaped terminals 1 used for connection with the terminal b is turned upside down, but in this case, it is up to the operator's judgment to prevent the breaker 4a for 100V from being connected to 200V, for example. As shown on the same page, terminal 1 is
Merely marking something like 100V or 200V on it was not enough to reliably prevent incorrect connections.

This invention was developed in view of the above points, and its main purpose is to prevent people from mistakenly connecting a low-voltage breaker to a high-voltage breaker and connecting it to a bus bar with a voltage higher than the rated voltage. can be reliably prevented,
Another object of the present invention is to provide a power distribution device in which a high voltage breaker can be used as a substitute for a low voltage breaker.

The present invention will be explained in detail below based on embodiments shown in the figures. The power distribution device according to the present invention includes two types of breakers 4 with different rated voltages, each having a pair of removable terminals 1 protruding from an end face, and three bus bars 2 embedded independently in an insulator. It also consists of a branch box 8 in which a plurality of connection ports 9a, 9b, 9c are opened in the end face of each breaker 4 into which the terminal 1 of each breaker 4 is inserted and connected to the corresponding busbar bar, and two different busbar bars 2 are connected to each other. Two connection ports 9b and 9c corresponding to
are lined up left and right along the longitudinal direction of the branch box 8, and two connection ports 9a, 9b corresponding to two different bus bars 2 are lined up and down, corresponding to the three bus bars 2, 2, 2. Connection port 9a, 9
b, 9c are arranged vertically and horizontally, and terminals 1, 1 to be inserted into two diagonally arranged connection ports 9a, 9b protrude from the end face of the low voltage breaker 4a among the two types of breakers 4, Terminals 1, 1 to be inserted into the two connection ports 9b, 9c arranged on the left and right protrude from the end face of the breaker 4b, and each terminal 1 is inserted into the breaker 4b from the upper and lower ends of the hanging piece 5 in opposite directions. The connecting piece 6 and the terminal piece 7 are formed into a substantially Z-shape that extends, and the breaker connecting piece 6 is inserted into a pair of terminal holes 3 arranged horizontally on the end face of each breaker 4a, 4b, and the hanging piece 5 is inserted. Groove 1 on each breaker end face
4, 15 and connect it to the connection port 9 of the branch box 8.
The terminal pieces 7 inserted into the terminals a, 9b, and 9c protrude, and the pair of grooves 14 and 15 provided in the low voltage breaker 4a are formed to have a vertical length that matches the length of the hanging piece 5. At least one groove 17 of the pair of grooves 16 and 17 provided in the breaker 4b for
is formed to have a length twice that of the hanging piece 5, and this concave groove 1
The terminal hole 3 is provided in the vertical center of the branch box 7, and this embodiment shows an example in which breakers 4 are connected to both widthwise ends of the branch box 8, respectively. As shown in FIG. 4, this power distribution device is housed in a distribution board A together with a main switch 10, and is used by connecting a terminal block 11 at one longitudinal end to the main switch 10. can be,
Normally, the branch boxes 8 are connected at their ends via terminal blocks 11, and an insulating cap 12 is provided at one end of the branch box 8, which is used with the main switch 10 separated. It will be done. The branch box 8 is formed by embedding three band-shaped busbars 2, 2, 2 vertically in a synthetic resin insulator, and the both sides of each busbar bar 2 are made of a highly springy metal. A terminal receiver 21 obtained by forming a material into a substantially U-shape is attached to the breaker 4.
A connecting portion 22 into which the terminal 1 is inserted is formed. That is, the terminal receiver 21 is
As shown in the figure, one piece is fixed to the lower side edge of the bus bar 2 with the bottom piece facing outward, and the V
The V-shaped piece 25 is attached to the upper surface of the bus bar 2 in elastic contact, and the terminal 1 inserted through the insertion opening 26 provided in the bottom piece is held in pressure contact between the V-shaped piece 25 and the bus bar 2. Three busbar bars 2 lined up and down,
The lower two bus bars 2, 2 of 2, 2 are the 10th
As shown in the figure, the upper and lower busbars 2 are bent in a square wave shape, and the remaining upper busbar 2 is straight, and a plurality of connecting portions 22 are formed at equal intervals along each busbar 2. The lower two generatrix bars 2, 2 have their peaks and valleys corresponding to each other vertically, and the valleys of the upper generatrix bar 2 and the peaks of the lower generatrix bar 2 are arranged on the same plane. , the connection part 22 of the upper bus bar 2, that is, the middle bus bar 2 among the three, is formed in the valley part, and the connection part 22 of the lower bus bar 2 is formed in the peak part, so that both the connection parts 22, 22 are aligned in a straight line. The connecting portions 22 of the remaining upper bus bar 2 are arranged above the connecting portions 22 of the middle bus bar 2 and the lower bus bar 2, respectively. Arranged in Connection ports 9a, 9a, 9b, and 9c that open on both end faces in the width direction of the branch box 8 are formed at positions corresponding to these connection portions 22, and a set of four connection ports 9a, 9a, 9b, and 9c are formed at positions corresponding to these connection portions 22. As shown in the figure, a plurality of sets of branch boxes 8 are provided along the longitudinal direction. On the other hand, a pair of terminals 1, 1 protrude from the end faces of breakers 4a, 4b attached to this branch box 8, and two diagonally corresponding connections among the four connection ports 9a, 9a, 9b, 9c are provided. Mouth 9a, 9c, 9a, 9
b, or the two connection ports 9b, 9 arranged on the left and right below
c, and is electrically connected to two of the three busbar bars 2, 2, 2 through each connection part 22, and the connection port 9a and R corresponding to the S-phase busbar bar 2. A 100V breaker 4a into which terminals 1 are inserted into connection ports 9b and 9c corresponding to the bus bars 2 of the phase and T phases, respectively, and a pair of connection ports 9b and 9c corresponding to the bus bars 2 of the R and T phases. Two types of breaker 4b for 200V are used, and a breaker 4b for 200V is inserted into each terminal 1. As shown in FIG. 17, the terminals 1 of the breakers 4a and 4b are formed into a shape in which a breaker connection piece 6 and a terminal piece 7 each extend at right angles in opposite directions from both ends of a vertical piece 5, thereby forming a breaker connection. The piece 6 is inserted into the inside of the breakers 4a, 4b from the end face, and as shown in FIG. 18, the terminal piece 7 is electrically connected to the contact plate 35 by the terminal screw 34 and protrudes from the end face.
Connect each connection port 9 of the branch box 8 as described above.
a, 9b, 9c to be electrically connected to a predetermined bus bar 2. Breaker 4a for 100V
As shown in FIG. 15, on the left and right sides of the end face of the terminal 1, grooves 14 and 15 are vertically shifted and have a vertical length equal to the length of the hanging piece 5 and a depth equal to the thickness of the hanging piece 5. Terminal holes 3 communicating into the breaker 4a are formed at the same height in the upper part of one groove 14 and the lower part of the other groove 15, respectively, and the breaker connecting piece 6 is inserted into each terminal hole 3. The hanging pieces 5 of the terminals 1 are housed in the grooves 14 and 15, and the terminal pieces 7 are made to protrude at positions opposite to the respective terminal holes 3, so that the breaker 4a can be inserted as shown in FIG. When connected to the branch box 8, the end faces of both terminals are in close contact with each other, and if one of the terminals 1 is attached to the breaker 4a upside down, the 21st
As shown in the figure, the hanging piece 5 protrudes from the end face of the breaker 4a, creating a gap c between it and the end face of the branch box 8.
When this occurs, it is possible to determine that there is an abnormality in the connection of the breaker 4a, and a warning is issued if the 100V breaker 4a is incorrectly connected to a 200V power source. As shown in FIG. 14, a rib 30 for preventing incorrect connection is provided above the groove 14, and a recess (not shown) in which the rib 40 is accommodated is provided in the branch box 8 at a position corresponding to the rib 30. By providing this, when the terminal 1 is inserted into the breaker 4a upside down, the hanging piece 5 of the terminal 1 collides with the rib 30 and floats up, which can prevent the terminal 1 itself from being incorrectly connected to the breaker 4a. . Further, on the left and right sides of the end face of the 200V breaker 4b, as shown in FIG. 16, there are grooves 16 whose vertical length is equal to the length of the hanging piece 5 of the terminal 1 and whose depth is equal to the inner thickness of the hanging piece 5. A groove 17 is formed with a vertical length twice as long as that of the hanging piece 5 and a depth equal to the inner thickness of the hanging piece 5. A terminal hole 3 is formed at the height position,
When used for 200V, insert the breaker connecting piece 6 of each terminal 1 into the terminal hole 3 so that each terminal piece 7 protrudes at the same height as shown in Figure 14a, and insert each vertical piece 5 into the terminal hole 3. are placed in the grooves 16 and 17,
When used for 100V, as shown in Figure 14b, the terminal 1 placed in the longer groove 17 is replaced upside down, and in this case, the hanging piece 5 of the terminal 1 is The 20th
As shown in the figure, the breaker 4b and the branch box 8 can be connected in close contact with each other.

As described above, the present invention consists of the end faces of two types of breakers with different rated voltages being butted against the end face of a branch box, and the breaker connecting piece and the terminal piece extending in opposite directions from both ends of the vertical piece. A breaker connection piece of a Z-shaped terminal is inserted into the terminal hole on the end face of the breaker, and the terminal piece is inserted into the connection port of the branch box to electrically connect the breaker and the branch box. A groove with the same length as the vertical piece of the terminal is provided on the end face of the breaker, and the vertical piece is housed in the groove, so if the terminal is inserted upside down into a low voltage breaker, the vertical piece will be removed. It protrudes from the end face of the breaker, and as a result, the hanging piece gets in the way between the branch box and the breaker, making it impossible to butt the two end faces together, making it impossible to connect correctly. This has the advantage of preventing people from mistakenly using a breaker for high pressure with one for high pressure.In addition, at least one of the pair of concave grooves provided on the end face of the breaker for high pressure is twice the size of the vertical piece. Since the long terminal is to be placed in either the upper or lower part of this groove, one terminal is installed upside down and attached to the breaker, and a pair of terminals protrudes at the same position as the low voltage breaker terminal. Therefore, a high voltage breaker can be used as a substitute for a low voltage breaker.

[Brief explanation of the drawing]

Figure 1 is a connection diagram between two types of breakers with different rated voltages and a three-phase single wire bus bar, Figures 2a and b are schematic side views of conventional examples, and Figures 3a and b are schematic side views of conventional examples. 2 a and b, FIG. 4 is a schematic plan view showing an example of use of an embodiment of the power distribution device according to the present invention, and FIG. 5 is a plan view showing an example of the embodiment of the present invention. Fig. 6 is a partially cutaway side view of the same as above, Fig. 7 is a partially enlarged plan view of the generatrix bar used in the above, Fig. 8 is a partially enlarged side sectional view of the same as above, and Fig. 9 is a branch box used in the same as above. 10 is a front view of the same, FIG. 11 is a rear view of the same, FIG. 12 is a partially enlarged front view of the same, and FIG. 13 is a partial perspective view of a low pressure breaker used in the above. Figures 14a and 14b are partial perspective views of the high voltage breaker used in the above;
Figure 15 is a front view of the same low voltage breaker as above.
Figure 16 is a front view of the same high voltage breaker as above.
Figures 17a, b, and c are plan, front, and side views of the terminals used in the above, Figures 18a and b are partial sectional views of each breaker, and Figures 19 to 21 are the branches of the same. It is an explanatory diagram showing the connection state of the box and the breaker, 1 is a terminal, 2 is a bus bar, 3 is a terminal hole, 4a is a breaker for low withstand voltage, 4b is a breaker for high withstand voltage, 5
is a hanging piece, 6 is a breaker connection piece, 7 is a terminal piece, 8 is a branch box, 9a, 9b, 9c are connection ports,
14, 15, 16, and 17 are grooves.

Claims (1)

[Scope of utility model registration request] Two types of breakers with different rated voltages have a pair of removable terminals protruding from the end face, and three bus bars are embedded independently within the insulator, and the terminals of each breaker are inserted into the end face in the width direction. The branch box is comprised of a branch box in which a plurality of connection ports are opened and connected to the corresponding busbar bars, and the two connection ports respectively corresponding to two different busbars are arranged left and right along the longitudinal direction of the branch box. , two connection ports corresponding to two different bus bars are arranged vertically, and connection ports corresponding to three bus bars are arranged vertically and horizontally, and from the end face of the breaker for low voltage among the two types of breakers. The terminals to be inserted into the two connection ports arranged diagonally protrude, and the terminals inserted into the two connection ports arranged on the left and right protrude from the end face of the high voltage breaker, and each terminal has a hanging piece. The breaker connecting piece and the terminal piece extend in opposite directions from the upper and lower ends of the breaker, and the breaker connecting piece is inserted into a pair of terminal holes arranged horizontally on the end face of each breaker. The terminal piece is inserted into the concave groove on the end face of each breaker and inserted into the connection port of the branch box, and the terminal piece protrudes. At least one of the pair of grooves provided in the high voltage breaker is formed to have a length twice that of the vertical piece, and a terminal hole is provided in the vertical center of this groove. A power distribution device featuring: