JP6304703B2 - Circuit breaker - Google Patents

Description

  The present invention relates to the structure of a circuit breaker.

  A thermal electromagnetic circuit breaker has a structure in which a circuit is interrupted by sensing heat generated by an overcurrent with a bimetal. For this reason, the electroconductive part connected to a bimetal tends to become high temperature. In addition, the connection between the circuit breaker and the external conductor also tends to increase in temperature due to the occurrence of connection resistance. Various circuit breakers such as bimetals that are hardly affected by heat have been devised so far and put into practical use.

  For example, in the circuit breaker described in Patent Document 1, a ventilation groove 6 is formed on the mounting surface of the case 1 of the circuit breaker so as to extend from the load side terminal portion to the power supply side terminal portion. As a result, a chimney-like space is formed between the circuit breaker and the mounting panel 7, and cold air in the vicinity of the load side terminal portion flows from the bottom to the top through the ventilation groove 6 due to the so-called chimney effect, thereby cooling the inside of the case. The According to this circuit breaker, a high cooling effect not obtained by natural heat dissipation can be obtained.

  The circuit breaker described in Patent Document 2 includes a case formed of a synthetic resin and a metal member for heat dissipation. The metal member is partially inserted inside the case and partially exposed to the outside. When the case is fixed to a mounting plate for mounting a circuit breaker, the metal member is attached to the mounting plate. It is the structure which contacts. According to this structure, the heat generated inside the circuit breaker can be efficiently radiated to the outside of the circuit breaker by the metal member inserted in the case.

JP-A-5-282986 JP 2007-3111183 A

  Usually, the circuit breaker is mounted and used in a distribution board. In particular, several to several tens of circuit breakers for branching are arranged and used in a state of being adjacent to two upper and lower rows at the time of mounting. This is to use the space in the distribution board effectively.

  By the way, the current flowing through each circuit breaker is often different because the number and types of loads connected to the circuit breaker differ depending on the circuit. The circuit breaker also has different internal resistance depending on the rated current. Due to these two factors, the amount of heat generated from each circuit breaker is not constant, and is affected by the heat from the adjacent circuit breaker, and may also be adversely affected by the heat. .

  With respect to this problem, the circuit breaker of Patent Document 1 has a structure in which a ventilation groove is provided on the case mounting surface of the circuit breaker. When this structure is used for a branch circuit breaker, the branch circuit Usually, since a plurality of circuit breakers are used side by side, the heat radiated from the ventilation groove may affect the adjacent circuit breakers. In addition, since the circuit breakers for branching are often arranged in two rows on the distribution board, the heat of the circuit breakers in the lower row flows upward due to the so-called chimney effect, and the circuit breakers in the upper row There is a risk of impact.

  Further, in the circuit breaker disclosed in Patent Document 2, when the metal member is insert-molded on the base of the circuit breaker and fixed to the mounting plate, the mounting plate and the metal member are in contact with each other, and therefore, generated internally. This heat can be efficiently radiated to the outside of the circuit breaker by the metal member inserted in the base. However, even when this circuit breaker is used as a branch circuit breaker, a plurality of circuit breakers are arranged on one mounting plate to dissipate heat. Heat can be transferred to a low circuit breaker, resulting in thermal effects.

  As described above, in the structures of the above two patent documents, the heat of the circuit breaker can be radiated, but when applied to a branch circuit breaker, a plurality of branch circuit breakers are used adjacent to each other. For this reason, the heat dissipated from the circuit breaker at a high temperature is transferred to the circuit breaker at a low temperature, which is not sufficient to prevent an influence such as a deviation in the set operation time.

  The present invention has been made in view of such a point, and an object of the present invention is to provide a circuit capable of preventing the thermal influence of adjacent circuit breakers when a plurality of adjacent circuit breakers are used. It is to provide a circuit breaker.

1st invention is a circuit breaker provided with the terminal part which performs the connection with the exterior, the case which forms an outline, and an internal circuit means, The said circuit breaker is used by two or more adjacently The heat insulating means for preventing the thermal influence from the terminal of the adjacent circuit breaker is formed on the side surface of the case with a heat insulating material provided on the side surface of the terminal portion .

  According to said structure, since the heat insulation means is provided in the case side surface, the thermal influence from the terminal of other adjacent circuit breakers can be prevented. Therefore, it is possible to prevent the operation time of the circuit breaker from being distorted.

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Moreover , since the heat insulating means is a heat insulating material provided on the side surface of the case, the thermal influence from the adjacent circuit breaker can be reliably prevented. In particular, the degree of thermal influence between adjacent circuit breakers can be controlled by adjusting the type and amount of the heat insulating material. By changing the type of the heat insulating material, there is an effect that the amount of change in the heat insulating effect can be greatly changed as compared with the heat insulating space using the air layer.

According to a second aspect of the present invention, there is provided a circuit breaker comprising a terminal portion for connection to the outside, a case formed of a resin material and forming an outer shape, and an internal circuit means, wherein the circuit breakers are used adjacent to each other. The heat insulation means for preventing the thermal influence from the terminal of the circuit breaker adjacent to the side surface of the case is composed of a heat insulating thick portion provided on the side surface of the terminal portion.

According to said structure, the thermal influence from an adjacent circuit breaker can be controlled by changing the thickness of a case. By increasing or decreasing the amount of resin used, thermal influence can be changed, such Okozu available without incurring too much cost. Further, since heat is conducted through the thick part of the resin, the influence of heat can be considered without being affected by the outside air temperature.

  As described above, according to the present invention, when a plurality of adjacent circuit breakers are used, it is possible to prevent a thermal influence from adjacent circuit breakers with a simple structure and stabilize a set operation time. A circuit breaker that can be provided can be provided.

It is a perspective view of the circuit breaker which provided the recessed part in the side surface of the terminal which concerns on Embodiment 1 of this invention. It is sectional drawing of the power supply side terminal part of the circuit breaker concerning Embodiment 1. FIG. It is sectional drawing of the power supply side terminal part of the circuit breaker in the case of being used adjacent to multiple according to Embodiment 1. It is a figure at the time of providing a heat insulating material in the side surface of the terminal part of the circuit breaker concerning Embodiment 2. FIG. It is a figure at the time of using together the heat insulating material which concerns on Embodiment 2, and an air layer. It is a figure at the time of providing a heat insulation thick part in the side surface of the terminal part of the circuit breaker concerning Embodiment 3. It is a general-view figure of a distribution board.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, description of the following preferable embodiment is only an illustration essentially, and does not restrict | limit this invention, its application thing, or its use.

  First, it will be described in what form the circuit breaker for branching is used. A plurality of circuit breakers 10 for branching are generally connected and used adjacent to a distribution board 100 as shown in FIG. Many of them are used in two rows at the top and bottom to make effective use of space. Each circuit breaker 10 is connected to a different load, and the flowing current differs depending on the connected load. For this reason, the amount of heat generated by each circuit breaker is different, and heat is transferred from the circuit breaker having a high temperature to the circuit breaker having a low temperature.

  Next, the circuit breaker 10 will be described. The circuit breaker 10 has a primary side connected to a conductive bar and supplied with power, and a secondary side connected to a load. When a current exceeding the rated current flows through the circuit on the load side, it has a function to cut off the circuit.

  The circuit breaker 10 for branching is generally a thermo-electromagnetic type, and detects heat generated by overcurrent with a bimetal that is a thermal element. The bimetal is a joined body of dissimilar metals, and has a higher resistance than the main conductor made of copper. Therefore, Joule heat is generated when a current flows, and the temperature becomes high. Further, since connection resistance is generated at the connection portion between the circuit breaker 10 and the conductive bar and the connection portion between the circuit breaker 10 and the load side circuit, the temperature tends to increase. Since a plurality of branch circuit breakers 10 are used adjacent to each other, the circuit breakers have a thermal influence on each other due to the generated heat.

  Next, each embodiment will be described.

  FIG. 1 is a perspective view of a circuit breaker according to Embodiment 1 of the present invention.

  First, the right case 11 and the left case 12 that form the outline of the circuit breaker 10 will be described. As shown in FIG. 1, each case is configured by combining the cases from the left and right directions, and the case has holes 11a to 11d through which four rivets to be combined pass. The four rivets are used to combine the cases to form a substantially rectangular circuit breaker outline.

  As shown in FIG. 1, a handle 13 that is linked to the internal mechanism and the contact device is attached to the upper surface of the case. The figure shows the handle 13 in the ON state. During normal use (a state in which no abnormal current flows), by operating the handle 13, the internal mechanism and the contact device are driven, and the circuit is turned on and off. When an abnormal current such as an overcurrent is generated, the bimetal is heated to a high temperature, so that the bimetal itself is bent in one direction due to the difference in the coefficient of thermal expansion of the dissimilar metal, and the position of the bimetal is displaced. When the displacement of the bimetal acts on the internal mechanism, the latch portion provided in the internal mechanism operates and the contact device is turned off.

  As shown in FIG. 2, the case is provided with a terminal portion for connection to the outside. There are two types of terminal portions: a power supply terminal 14 connected to a connection portion of the distribution board and a load terminal 15 connected to a load.

  As shown in FIG. 4, the edge shape of the recessed portion (referred to as the recessed portion 111) provided on the side of the case 11 and in the vicinity of the power supply terminal 14 is a square shape. The shape may be any shape such as a round shape.

  In order to take advantage of the heat insulating effect of the recess 111 serving as a heat insulating means, the depth of the recess 111 is preferably deep. However, since it is actually provided on the side surface of the power supply terminal 14, the depth of the recess 111 is about half of the thickness of the circuit breaker 10 in the left-right direction as shown in FIG.

  It is also conceivable to provide the recesses 111 on both sides of the power terminal 14 side. This is effective when the power supply terminal 14 is provided in the central portion of the circuit breaker 10 in the left-right direction.

  It is also conceivable to use the concave portion 111 for an internal structure, such as using the concave portion 111 as a terminal metal arrangement portion or a holding portion.

  FIG. 3 is a cross-sectional view of the main part of the power supply side terminal 14 portion of the circuit breaker 10 used adjacently. As shown in the figure, the recesses 111 and the power terminals 14 formed in the case 11 are alternately arranged. As described above, the heat insulating means is located on the side of the terminal serving as the conductor connecting portion, and the thermal influence can be effectively suppressed. Each circuit breaker 10 is usually connected to a different load, and the current flowing through the terminal portion is different, so the amount of heat generated at the terminal portion is different. The heat generated at the power supply terminal 14 of each circuit breaker 10 always passes through the recess 111 formed in the case 11 before reaching the adjacent circuit breaker. Since the recess 111 is a space, there is an air layer, and there is a certain heat insulation effect between the power terminals. For this reason, it is difficult to thermally affect other adjacent circuit breakers.

  As described above, in this embodiment, the other circuit breaker adjacent to itself has a concave portion 111 having an air layer molded in the case 11 even when a large amount of loads are connected to the circuit breaker. Due to the heat insulation effect, the circuit breaker 10 can be used without any deviation in the set operation time.

  Next, Embodiment 2 will be described. In Embodiment 2, as shown in FIG. 4, the heat insulating material 111b is provided as a heat insulating means on the side surface of the terminal portion.

  In this embodiment, the thermal influence from the adjacent circuit breaker 10 is controllable by using the heat insulating material 111b as a heat insulation means. That is, the thermal influence between adjacent circuit breakers can be controlled by adjusting the type and amount of the heat insulating material. The amount of change in the heat insulation effect by changing the type of the heat insulating material can be greatly changed as compared with the heat insulating space using the air layer.

  Further, a heat insulating material may be used in combination with the recess 111 as shown in FIG.

  Further, the heat insulating material may be insert-molded from the outer wall surface of the case 11, or the heat insulating material may be disposed on the inner wall surface of the case 11.

  Next, Embodiment 3 will be described. In the present embodiment, as shown in FIG. 6, a heat insulating thick portion 111 d is provided on the side of the case outer terminal. The case 11 is formed of a resin material and is configured by providing a thick portion on a case wall portion located on the side of the terminal portion 14.

  In addition, the heat insulating thick part 111d is provided with an arrangement mechanism for internal parts of the case 11, such as forming an arrangement part for the power terminal 14 part or forming a pressing part for the first power terminal 14 part. Also good.

  In this embodiment, the thermal influence from the adjacent circuit breaker can be controlled by changing the thickness of the case 11. By changing the amount of resin to be used, the thermal influence can be changed, and a heat insulation effect can be obtained at a cost equivalent to the amount of resin to be used. Moreover, since heat is conducted through the thick portion 111d of the resin, the influence of heat can be considered without being affected by the outside air temperature.

  As shown in FIG. 3, a load terminal 15 is provided on the opposite side of the power supply terminal 14, and these heat insulating means are provided not only on the side of the power supply terminal 14 but also on the side of the load terminal 15. May be configured. As a result, it is possible to provide a circuit breaker that is less susceptible to thermal influence from adjacent circuit breakers.

Moreover, you may comprise the said heat insulation means in the side of the part in which the bimetal used as the internal mechanism of the circuit breaker 10 is located. As a result, it is possible to provide a circuit breaker that is difficult to convey the thermal influence from the bimetal, which has a higher temperature, to the outside.

DESCRIPTION OF SYMBOLS 10 Circuit breaker 11 Right side case 12 Left side case 14 Power supply terminal 15 Load terminal 111 Recessed part 100 Distribution board 11a-11d Rivet 13 Handle

Claims (2)

In a circuit breaker comprising a terminal portion for connection with the outside, a case forming an outer case, and an internal circuit means, a plurality of the circuit breakers are used adjacent to each other, and a circuit adjacent to a side surface of the case The circuit breaker characterized by comprising the heat insulation means for preventing the thermal influence from the terminal of a circuit breaker with the heat insulating material provided in the said terminal part side surface . In a circuit breaker comprising a terminal portion for connection with the outside, a case molded with a resin material to form an outer shell, and an internal circuit means, the circuit breaker is used adjacent to the case, and the case A circuit breaker comprising heat insulation means for preventing thermal influence from a terminal of a circuit breaker adjacent to the side surface of the circuit board, with a heat insulating thick portion provided on a side surface of the terminal portion .

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