Heat dissipation busbar for circuit breaker and manufacturing method therefor

Abstract

The present invention relates to a heat dissipation busbar for a circuit breaker and a manufacturing method therefor and, more specifically, to a heat dissipation busbar for a circuit breaker and a manufacturing method therefor, which can greatly improve heat dissipation efficiency while simplifying a work process for installing the busbar, by integrally forming a heat dissipation fin on the busbar provided in a high / low voltage circuit breaker, and can minimize deterioration of a heat dissipation effect due to an increase in current density by eliminating step formation caused by the heat dissipation fin.

Description

Heat-dissipating busbar for circuit breakers and its manufacturing method

[0001] The present invention relates to a heat dissipation busbar for a wiring circuit breaker and a method for manufacturing the same, and more particularly, to a heat dissipation busbar for a wiring circuit breaker and a method for manufacturing the same, which can significantly improve heat dissipation efficiency while simplifying the work process for busbar installation by integrally forming heat dissipation fins on the busbar provided in a high / low voltage wiring circuit breaker, and can minimize the decrease in heat dissipation effect due to an increase in current density by eliminating the occurrence of a step caused by the heat dissipation fins.

[0002] According to the National Fire Information Center of the National Fire Agency's fire statistics from 2017 to 2021, the total number of fires caused by electrical factors was 47,956, of which 22,690 cases, or 47.4%, were caused by overload / overcurrent accompanied by heat generation, unidentified short circuits, and tracking.

[0003] In particular, the overcurrent circuit breaker (hereinafter referred to as the “circuit breaker”) of the main distribution unit has a high risk of fire accidents due to high heat generation and the wiring unit temperature exceeds 120℃, so temperature control is essential.

[0004] In general, a circuit breaker is an electrical device that automatically cuts off the circuit in the event of an electrical overload or short circuit to protect the circuit and load. It is largely composed of a terminal section that can connect the power supply side and the load side, a mechanical section that opens and closes the fixed terminal and the movable terminal so that they can mechanically come into contact, a trip section that detects overcurrent or short-circuit current on the power supply side and induces the trip operation of the mechanical section, and an arc extinguishing section that extinguishes the arc that occurs when the abnormal current is interrupted.

[0005] A busbar is typically used to connect the power terminal and the load terminal that constitute the above terminal section. The busbar is a metal conductor used to transmit electrical energy, and is made of copper or aluminum, which has low resistance and excellent electrical conductivity.

[0006] In order to improve the performance and durability of such busbars, heat dissipation performance is essential. As a related art, Korean Patent Registration No. 10-1433004 discloses a heat sink busbar having a heat sink in the shape of a concave-convex shape formed on the upper surface, and Korean Patent Publication No. 10-2024-0020884 discloses a high-voltage, high-current busbar in which a portion of the lower plate among two plates installed to overlap each other is cut and bent to form a heat dissipation fin whose end is exposed to the upper portion of the upper plate.

[0007] The above-mentioned conventional technologies have a technical feature of improving the heat dissipation performance of the busbar by increasing the heat dissipation area, but the heat sink formed in a rough shape or the heat dissipation fin formed by bending a portion of the plate material does not increase the heat dissipation area significantly, so there is a problem that the effect of improving the heat dissipation performance is inevitably limited.

[0008] Recently, in order to solve this problem, as shown in Fig. 1, a method has been used in which a heat sink made of aluminum, that is, a heat sink (3) equipped with a plurality of heat dissipation fins (2), is bonded or fastened to a busbar (1) to increase the surface area for heat dissipation compared to the conventional technologies described above. However, aluminum has lower thermal conductivity than copper, which is mainly used as a material for busbars, so not only is the degree of improvement in heat dissipation efficiency low compared to the increase in surface area, but there is also a disadvantage in that additional processing is required to bond the heat sink to the busbar.

[0009] As mentioned above, in the case of a circuit breaker, the wiring temperature rises to over 120℃ due to high heat generation, which increases the risk of fire accidents caused by deterioration. In addition, when using a heat sink made of aluminum, the volume of the heat sink must increase accordingly to improve heat dissipation efficiency. Therefore, considering the trend of increasing power consumption, there is an urgent need to develop a busbar that can exhibit higher heat dissipation performance.

[0010] The present invention has been made to solve the problems of the prior art as described above, and the purpose of the present invention is to provide a heat dissipation busbar for a wiring circuit breaker and a manufacturing method thereof, which can improve the heat dissipation effect while minimizing the increase in the volume of the busbar by integrally forming a plurality of heat dissipation fins on the upper surface of the busbar made of copper material by a skiving cutting method.

[0011] In addition, the present invention has another purpose of providing a heat dissipation busbar for a wiring circuit breaker and a manufacturing method thereof, which can prevent heat dissipation efficiency from being reduced due to an increase in current density at a step by integrally forming a heat dissipation fin by skiving cutting on the upper surface of the busbar while preventing a step from being formed between the body and terminal portion of the busbar.

[0012] The present invention to achieve the above purposes,

[0013] In a busbar made of copper and including a body and a terminal, a plurality of heat dissipation fins formed by processing the body by skiving cutting may be integrally provided on the upper surface of the body.

[0014] At this time, a step portion having a height difference such that the upper surface of the body portion is higher than the upper surface of the terminal portion by a height greater than the thickness of the heat dissipation fin is formed between the body portion and the terminal portion, and the step portion formed between the upper surface of the body portion and the upper surface of the terminal portion can be eliminated and become flat by processing the heat dissipation fin by the skiving cutting.

[0015] Additionally, the plurality of heat dissipation fins can be formed simultaneously on the upper and lower surfaces of the body.

[0016] Meanwhile, the method for manufacturing a heat dissipation busbar for a wiring circuit breaker according to the present invention is as follows:

[0017] It may include a busbar processing step of processing a busbar including a body portion and a terminal portion using a copper plate in the shape of a plate; and a heat dissipation fin forming step of forming a plurality of heat dissipation fins on the upper surface of the body portion of the busbar through skiving processing.

[0018] At this time, after the busbar processing step, a step of forming a step of processing the upper surface of the terminal portion so that a height difference greater than the thickness of the heat dissipation fin is formed between the body portion and the terminal portion is further included, and after the heat dissipation fin is formed through skiving processing in the heat dissipation fin forming step, the step is eliminated so that the space between the body portion and the terminal portion can be flat.

[0019] According to the present invention, by integrally forming a plurality of heat dissipation fins on the upper surface of a busbar made of copper material by a skiving cutting method, the heat dissipation effect can be improved while minimizing the increase in the volume of the busbar through a simple process, and accordingly, the risk of fire accidents due to deterioration of a circuit breaker can be significantly reduced, thereby having the excellent effect of.

[0020] In addition, according to the present invention, by integrally forming a heat dissipation fin on the upper surface of the busbar while preventing a step from being formed between the body portion of the busbar where the heat dissipation fin is formed and the terminal portion, it has an additional effect of preventing a decrease in heat dissipation efficiency due to an increase in current density at the step.

[0021] Fig. 1 is a drawing showing an example of a heat dissipation busbar for a conventional wiring circuit breaker.

[0022] Fig. 2 is a drawing showing a heat dissipation busbar for a wiring circuit breaker according to the present invention.

[0023] Figures 3 (a) and (b) are drawings comparing the heat dissipation performance of the heat dissipation busbar for the wiring circuit breaker shown in Figures 1 and 2.

[0024] Fig. 4 is a drawing showing another embodiment of a heat dissipation busbar for a wiring circuit breaker according to the present invention.

[0025] Figures 5 (a) and (b) are drawings comparing the heat dissipation performance of the heat dissipation busbar for the wiring circuit breaker shown in Figures 1 and 4.

[0026] Figures 6 (a) and (b) are drawings showing another embodiment of a heat dissipation busbar for a wiring circuit breaker according to the present invention.

[0027] Figure 7 is a drawing exemplarily showing a process of forming a heat dissipation fin using a skiving device.

[0028] FIGS. 8 to 10 are drawings showing a jig used in manufacturing a heat dissipation busbar according to the present invention shown in FIG. 6.

[0029] Figure 11 is a flow chart sequentially showing the manufacturing process of a heat dissipation busbar for a wiring circuit breaker according to the present invention.

[0030] Hereinafter, with reference to the attached drawings, preferred embodiments of a heat dissipation busbar for a circuit breaker according to the present invention and a manufacturing method thereof will be described in detail.

[0031] FIG. 2 is a drawing showing a heat dissipation busbar for a wiring circuit breaker according to the present invention, and FIG. 3 (a) and (b) are drawings comparing the heat dissipation performance of the heat dissipation busbars for wiring circuit breakers shown in FIG. 1 and FIG. 2, FIG. 4 is a drawing showing another embodiment of the heat dissipation busbar for a wiring circuit breaker according to the present invention, and FIG. 5 (a) and (b) are drawings comparing the heat dissipation performance of the heat dissipation busbars for wiring circuit breakers shown in FIG. 1 and FIG. 4, and FIG. 6 (a) and (b) are drawings showing another embodiment of the heat dissipation busbar for a wiring circuit breaker according to the present invention, and FIG. 7 is a drawing showing an example of a process of forming a heat dissipation fin using a skiving device, and FIGS. 8 to 10 are drawings showing a jig used in manufacturing the heat dissipation busbar for a wiring circuit breaker according to the present invention shown in FIG. 6, and FIG. 11 is a flowchart sequentially showing a process of manufacturing the heat dissipation busbar for a wiring circuit breaker according to the present invention.

[0032]

[0033] The present invention relates to a heat dissipation busbar for a wiring circuit breaker and a method for manufacturing the same, which can greatly improve heat dissipation efficiency while simplifying the work process for installing a busbar by integrally forming heat dissipation fins on the busbar provided in a high / low voltage wiring circuit breaker, and which can minimize the decrease in heat dissipation effect due to increase in current density by eliminating the occurrence of a step caused by the heat dissipation fins. First, the heat dissipation busbar (100) for a wiring circuit breaker according to the present invention (hereinafter referred to as 'busbar (100)') is characterized in that heat dissipation efficiency can be improved by integrally forming heat dissipation fins (130) on its upper surface.

[0034] That is, as mentioned above, aluminum and copper are mainly used as materials for busbars that are commonly used. The busbar used in a circuit breaker mainly serves to supply or distribute high current, including a body part (120) for dissipating heat and a terminal part (110) that is installed and connected to a terminal part (not shown) of the circuit breaker. Therefore, if heat is generated in the busbar and resistance increases, power loss occurs, so it can be made of copper material that has low electrical resistance and excellent thermal conductivity.

[0035] In addition, in the case of a circuit breaker, there is a high risk of fire due to deterioration when the temperature of the terminal part where the wiring is made is 120℃ or higher, and accordingly, a method of increasing the surface area for heat dissipation by bonding or fastening a heat sink (3) equipped with a number of heat dissipation fins (2) to the body part (120) of the busbar has been used. Although copper has superior electrical and thermal conductivity compared to aluminum, it is heavier and more expensive than aluminum, and therefore, a heat sink (3) made of aluminum is usually attached to the body part of the busbar made of copper.

[0036] The present invention has a technical feature in that it allows the heat dissipation fins (130) made of copper to be formed integrally on the body (120) of a busbar (100) made of copper, thereby enabling the heat dissipation fins (130) to be formed on the busbar (100) without a separate heat dissipation plate (3) attachment process, thereby reducing the work man-hours for installing the busbar (100) on a circuit breaker, and at the same time, since the heat dissipation fins (130) made of copper with excellent thermal conductivity are formed integrally, it allows the volume to be reduced compared to the existing aluminum heat dissipation plate (3), while improving the heat dissipation performance. The heat dissipation fins (130) can be formed integrally on the busbar (100) by a skiving cutting method.

[0037] That is, as shown in Fig. 7, a busbar (100) made of copper material is placed on a skiving device (10) and then a cutter is used to process the heat dissipation fins (130), thereby manufacturing a busbar (100) in which a plurality of heat dissipation fins (130) are integrally formed on the upper surface of the body (120).

[0038] At this time, the thickness of the heat dissipation fin (130) can be formed to be 0.5 to 1.5 mm. If the thickness of the heat dissipation fin (130) is less than 0.5 mm, there is a concern that the durability may be reduced due to deformation such as thermal deformation due to the excessively thin thickness, and if the thickness of the heat dissipation fin (130) exceeds 1.5 mm, not only the weight of the overall busbar (100) increases, but also the number of heat dissipation fins (130) decreases, so there is a concern that the heat dissipation performance may be reduced.

[0039] In addition, the height of the heat dissipation fin (130) may be formed to be 25 to 35 mm, but when the height of the heat dissipation fin (130) is less than 25 mm, the effect of improving heat dissipation performance due to an increase in heat dissipation area may be minimal, and when the height of the heat dissipation fin (130) exceeds 35 mm, the heat dissipation performance may be further improved, but there is a disadvantage that the weight and volume of the overall busbar (100) increase, making it difficult to install in a circuit breaker or increasing the manufacturing cost of the busbar (100).

[0040] FIG. 3 (a) and (b) show comparisons of the heat dissipation performance of a conventional busbar (1) in which an aluminum heat dissipation plate (3) is attached to a copper busbar body, and a busbar (100) according to the present invention, that is, a busbar (100) in which heat dissipation fins (130) are integrally formed through skiving on a copper busbar body (120). When a current of 5000 A is applied to each of a pair of terminals and the maximum temperature of the busbar (1, 100) is measured, the maximum temperature of the conventional busbar (1) is measured to be 146.58°C, while the maximum temperature of the busbar (100) according to the present invention is measured to be 123.00°C, confirming that the heat dissipation performance is improved.

[0041] Meanwhile, according to another embodiment of the busbar (100) according to the present invention, as shown in FIG. 4, a step portion (140) may be formed between the body portion (120) and the terminal portion (110), that is, a step portion (140) in which the height of the body portion (120) is formed higher than that of the terminal portion (110). The portion of the body portion (120) protruding by the step portion (140) may be used to form a heat dissipation fin (130).

[0042] That is, when the upper surface of the body portion (120) and the terminal portion (110) constituting the busbar (100) are positioned on the same plane and the heat dissipation fin (130) is formed by processing the upper surface of the body portion (120), a step, i.e., a height difference, is inevitably formed between the body portion (120) and the terminal portion (110). When a step is formed between the body portion (120) and the terminal portion (110), as shown in FIG. 4, a current concentration phenomenon occurs in which a high current density is formed in the part where the step is formed, causing the temperature to rise and the heat dissipation effect to decrease accordingly.

[0043] Accordingly, by forming a step portion (140) between the body portion (120) and the terminal portion (110) of the busbar (100) so that the upper surface of the body portion (120) before forming the heat dissipation fin (130) is formed higher than the upper surface of the terminal portion (110), the step portion (140) can be eliminated by forming the heat dissipation fin (130) on the body portion (120) by skiving cutting, and thus the current concentration phenomenon caused by the step difference between the upper surface of the body portion (120) and the upper surface of the terminal portion (110) can be resolved.

[0044] At this time, the height of the step portion (140) formed between the body portion (120) and the terminal portion (110) may vary depending on the thickness and number of the heat dissipation fins (130), and may be set to have a height at least equal to the thickness of the heat dissipation fins (130) so that a step is not formed between the upper surface of the body portion (120) and the upper surface of the terminal portion (110) after processing the heat dissipation fins (130).

[0045] That is, the height of the step portion (140) can be set by adding a predetermined allowance to the thickness required to form the heat dissipation fin (130) through skiving processing, and if there is a height difference between the body portion (120) and the terminal portion (110) after processing the heat dissipation fin (130) or if the thickness tolerance of the busbar (100) is not satisfied, additional processing of the body portion (120) or the terminal portion (110) can be performed to eliminate the height difference or meet the thickness tolerance.

[0046] FIG. 5 (a) and (b) show the comparison of the heat dissipation performance of a conventional busbar (1) in which an aluminum heat dissipation plate (3) is attached to a copper busbar body, and a busbar (100) according to the present invention, i.e., a busbar (100) in which heat dissipation fins (130) are integrally formed through skiving on a copper busbar body (120) and no step is formed between the body (120) and the terminal (110). In the conventional busbar (1), the thickness and height of the heat dissipation fin (2) are 4 mm and 45 mm, respectively, and in the busbar (100) according to the present invention, the thickness and height of the heat dissipation fin (130) are 0.5 mm and 30 mm, respectively.

[0047] The ambient temperature was set to 25℃, and the input and output currents were set to 4,000A each. As a result of the test, the temperature difference (∆T) before and after the current supply of the conventional busbar (1) was 49.29℃, while the temperature difference (∆T) before and after the current supply of the busbar (100) according to the present invention was 39.55℃, confirming that the heat dissipation performance was improved by more than 20%.

[0048] Meanwhile, the shape of the busbar (100) may vary depending on the type of circuit breaker in which the busbar (100) according to the present invention is installed, that is, the size of the voltage used (high voltage, low voltage), the size of the rated current, or whether it is AC / DC (alternating current / direct current). For example, in the case of an air circuit breaker (ACB) of 2000 A or more or a large circuit breaker, as shown in (a) and (b) of FIG. 6, a plurality of heat dissipation fins (130) may be formed simultaneously on the upper and lower surfaces of the body (120) of the busbar (100) to improve heat dissipation performance.

[0049] At this time, when the heat dissipation fins (130) are formed simultaneously on the upper and lower surfaces of the body portion (120) as described above, the step portion (140) formed between the body portion (120) and the terminal portion (110) can be formed on both the upper and lower surfaces of the bus bar (100), and the portion of the body portion (120) protruding by the step portion (140) is used for processing the heat dissipation fins (130), so that after all the heat dissipation fins (130) are formed on the upper and lower surfaces of the body portion (120), the step portions (140) formed on the upper and lower surfaces of the bus bar (100) all disappear, so that the upper and lower surfaces between the body portion (120) and the terminal portion (110) can be placed on the same plane.

[0050]

[0051] Next, the method for manufacturing a busbar (100) according to the present invention relates to a method for manufacturing a busbar (100) as described above, and its configuration may include a busbar processing step (S10), a heat dissipation fin forming step (S30), and a finishing processing step (S40), as shown in FIG. 11.

[0052] First, the above busbar processing step (S10) is a process of processing a busbar (100) including a body portion (120) and a terminal portion (110) using a copper plate in the shape of a plate. The overall shape of the busbar (100) may vary depending on the type of circuit breaker on which the busbar (100) is to be installed.

[0053] At this time, a terminal coupling hole (112) for coupling with a wiring circuit breaker can be formed in the terminal portion (110), and a method for processing a busbar (100) using such a copper plate, i.e., a method for manufacturing a busbar made of copper material according to the type of wiring circuit breaker, is already known in various ways, so a detailed description thereof will be omitted.

[0054] Next, the heat dissipation fin forming step (S30) is a process for integrally forming a plurality of heat dissipation fins (130) on the upper surface of the body portion (120) of the busbar (100) processed in the busbar processing step (S10). As shown in FIG. 7, a plurality of heat dissipation fins (130) can be integrally formed on the upper surface or the upper surface and the lower surface of the body portion (120) by skiving cutting using a skiving device (10).

[0055] At this time, the thickness and height of the heat dissipation fin (130) can be formed to be 0.5 to 1.5 mm and 25 to 35 mm, respectively, as described above.

[0056] Meanwhile, the method for manufacturing a busbar (100) according to the present invention may further include a step of forming a step (S20), and the step of forming a step (S20) may be performed between the step of processing the busbar (S10) and the step of forming a heat dissipation fin (S30).

[0057] The step of forming the step (S20) above is a process for forming a step (140) between the terminal portion (110) and the body portion (120) of the processed busbar (100), that is, a step (140) that causes the upper surface of the body portion (120) to protrude upwards compared to the upper surface of the terminal portion (110). For example, among the upper surfaces of the terminal portion (110) and the body portion (120) that are positioned on the same plane, the upper surface of the terminal portion (110) may be processed to form a step (140) having a height difference greater than the thickness of the heat dissipation fin (130) between the upper surface of the body portion (120) and the upper surface of the terminal portion (110).

[0058] As described above, the step portion (140) is intended to prevent a height difference, i.e., a step, from being formed between the body portion (120) and the terminal portion (110) after processing the heat dissipation fin (130) in the heat dissipation fin forming step (S30). Since the portion of the body portion (120) protruding by the step portion (140) is used for processing the heat dissipation fin (130) using the skiving device (10) in the heat dissipation fin forming step (S30), when the heat dissipation fin forming step (S30) is completed, the step portion (140) disappears and the upper surface of the terminal portion (110) and the upper surface of the body portion (120) can be positioned on the same plane again.

[0059] At this time, in the case where the heat dissipation fin (130) is formed on both the upper and lower surfaces of the body part (120), the upper and lower surfaces of the terminal part (110) are processed in the step of forming the step (S20) so that the step (140) is formed between the lower surface of the body part (120) and the lower surface of the terminal part (110).

[0060] In addition, in the case where the heat dissipation fins (130) are formed on both the upper and lower surfaces of the body part (120) in the heat dissipation fin forming step (S30), the heat dissipation fins (130) are first formed on the upper or lower surface of the body part (120) using a skiving device (10), and then the busbar (100) is turned over so that the formed heat dissipation fins (130) face downward, and the heat dissipation fins (130) can be additionally formed on the lower or upper surface of the body part (120).

[0061] At this time, in the case where the heat dissipation fins (130) are additionally processed on the lower surface of the body part (120) in a state where the heat dissipation fins (130) are first processed on the upper surface of the body part (120), a plurality of slits (not shown) are formed on the base of the skiving device (10) for supporting the upper surface of the body part (120), i.e., the opposite surface to the surface used for processing the heat dissipation fins (130), through which the heat dissipation fins (130) formed on the upper surface of the body part (120) by the first processing can pass, so that the upper surface of the body part (120) can be supported by the base in a state where the first-processed heat dissipation fins (130) are inserted into the inside of the slits, and a support means for supporting both sides of the body part is provided in a retractable form on both sides of the base, so that the load generated in the process of forming the heat dissipation fins (130) on the lower surface of the body part (120) is directed toward the inside of the slits. It can be configured to minimize the amount transmitted to the inserted heat sink fin (130).

[0062] Meanwhile, in a case where the heat dissipation fins (130) are additionally processed on the lower surface of the body (120) after the heat dissipation fins (130) have been first processed on the upper surface of the body (120), a separate fixing jig (20) for fixing the busbar (100) to the skiving device (10) may be used. As shown in FIG. 8, the fixing jig (20) may include a jig body (22), a front support member (24), and an upper support member (26).

[0063] To explain in more detail, the jig body (22) is fixedly installed on the base of the skiving device (10) and serves to support the busbar (100) having a heat dissipation fin (130) processed on the upper surface of the body (120). The rear end is formed in a '━┛' shape with an upward bend so that the protruding portion of the rear end can be configured to support the rear end of the busbar (100).

[0064] At this time, as shown in Fig. 9, a plurality of heat dissipation fin support portions (22c) may be formed protrudingly on the upper surface of the jig body (22), and the width, i.e., the thickness, of the heat dissipation fin support portions (22c) may be formed to be the same as the spacing between the heat dissipation fins (130), so that the facing surfaces of the neighboring heat dissipation fins (130) may be supported by the heat dissipation fin support portions (22c) so as to contact the front and rear surfaces of the heat dissipation fin support portions (22c), respectively.

[0065] In addition, the height of the heat dissipation fin support member (22c) may be formed to be higher than the height of the heat dissipation fin (130), so that the heat dissipation fin (130) can be supported by the heat dissipation fin support member (22c) up to the lower end.

[0066] That is, the busbar (100) having the heat dissipation fins (130) processed on the upper surface of the body (120) can be placed on the upper surface of the jig body (22) in an inverted state with the upper surface facing downward, as shown in FIG. 10, and the heat dissipation fins (130) can be supported by being fitted into the outer side of the heat dissipation fin support portion (22c), and the body portion (120) in which the heat dissipation fins (130) are not formed can be supported by being seated on the upper part of the mounting portion (22b) that is protruded in front of the heat dissipation fin support portion (22c).

[0067] At this time, the upper end of the heat dissipation fin support portion (22c) and the upper end of the mounting portion (22b) are formed at the same height so that the body portion (120) of the busbar (100) can be supported on the jig body (22) in a horizontal state overall, and accordingly, when processing the heat dissipation fin (130) on the lower surface of the body portion (120), the impact applied to the heat dissipation fin (130) supported by the heat dissipation fin support portion (22c) can be minimized, and the risk of errors occurring when processing the heat dissipation fin (130) on the lower surface of the body portion (120) can be reduced.

[0068] In addition, the jig body (22) may have at least one through hole (22a) formed to enable the jig body (22) to be fixedly installed on the base of the skiving device (10) by means of a fastening means such as a bolt, and through holes (24a, 26a) may be formed in the front support member (24) and the upper support member (26) described later for connection with the jig body (22) by means of a fastening means.

[0069] Next, the front support member (24) can be connected to the front of the jig body (22) in a state where the busbar (100) with the heat dissipation fin (130) processed on the upper surface of the body (120) is installed in an upside-down state, i.e., with the upper surface facing downward, to support the front end of the busbar (100).

[0070] At this time, the lower part of the front support member (24) can be fixed to the front of the jig body (22) by joining the fastening means through the through hole (24a), and the upper part of the front support member (24) can protrude to the upper part of the jig body (22) to support the front end of the bus bar (100).

[0071] That is, the rear end of the busbar (100) can be supported by the rear end of the jig body (22) that is formed to protrude upward, and the front end of the busbar (100) can be supported by the front support member (24), so that the busbar (100) can be fixed so that no movement or movement in the forward and backward direction occurs during the process of processing the heat dissipation fin (130) on the lower surface of the body (120).

[0072] Next, the upper support member (26) can be vertically connected to the upper rear portion of the jig body (22) with the busbar (100) installed to support the upper rear portion of the busbar (100).

[0073] That is, the upper support member (26) can be fixedly fastened to the rear upper portion of the jig body (22) by means of a fastening means through a through hole (26a), and the front end of the upper support member (26) protrudes forward from the rear upper portion of the jig body (22) to support the rear upper portion of the busbar (100), thereby preventing the busbar (100) from moving or moving in the up and down direction during the process of processing the heat dissipation fin (130) on the lower surface of the body portion (120).

[0074] Accordingly, the jig body (22) is fixedly installed on the base of the skiving device (10), and as shown in FIG. 10, the step portion (140) formed on the lower surface of the body portion (120) is turned over so that the upper surface of the body portion (120) is facing upward, and the busbar (100) with the heat dissipation fins (130) processed on the upper surface of the body portion (120) is placed on the jig body (22), and the front support member (24) and the upper support member (26) are respectively connected to the jig body (22) to fix the busbar (100) so that it does not move forward and backward and does not move up and down, and then the step portion (140) formed on the lower surface of the body portion (120) is processed using the skiving device (10), so that a busbar (100) with heat dissipation fins (130) formed on both the upper and lower surfaces can be manufactured, as shown in FIG. 8.

[0075] Next, the above finishing processing step (S40) is a process for inspecting the busbar (100) on which the heat dissipation fin (130) processing has been completed before shipping and performing additional processing if there is an abnormality. It may include a process for washing and drying the processed busbar (100), a process for removing a step between the upper surface of the body (120) and the terminal (110) if there is one, or a process for checking the dimensions according to the type of circuit breaker to be installed.

[0076] Therefore, according to the busbar (100) and the manufacturing method thereof according to the present invention as described above, by integrally forming a plurality of heat dissipation fins (130) on the upper surface of the busbar (100) made of copper material by a skiving cutting method, the heat dissipation effect can be improved while minimizing the increase in the volume of the busbar (100) through a simple process, and accordingly, the risk of fire accidents caused by deterioration of the circuit breaker can be significantly reduced, and while integrally forming the heat dissipation fins (130) on the upper surface of the busbar (100), a step is not formed between the body portion (120) and the terminal portion (110) of the busbar (100) where the heat dissipation fins (130) are formed, thereby preventing a decrease in heat dissipation efficiency due to an increase in current density at the step, etc., have various advantages.

[0077]

[0078] Although the above-described embodiments have described the most preferred examples of the present invention, it is not limited to the above-described embodiments, and it is obvious to those skilled in the art that various modifications are possible within a scope that does not depart from the technical spirit of the present invention.

Claims

1. In a busbar made of copper material and including a body and a terminal portion, A heat dissipation busbar for a circuit breaker characterized in that a plurality of heat dissipation fins are integrally provided on the upper surface of the body portion by processing the body portion by skiving cutting.

2. In paragraph 1, Between the body part and the terminal part, a step part having a height difference such that the upper surface of the body part is higher than the upper surface of the terminal part by a height greater than the thickness of the heat dissipation fin is formed. A heat dissipation busbar for a circuit breaker characterized in that the step formed between the upper surface of the body and the upper surface of the terminal is eliminated and becomes flat by processing the heat dissipation fin by the above-mentioned skiving cutting.

3. In paragraph 1, A heat dissipation busbar for a wiring circuit breaker, characterized in that the above-mentioned plurality of heat dissipation fins are formed simultaneously on the upper and lower surfaces of the body.

4. A busbar processing step for processing a busbar including a body portion and a terminal portion using a copper plate in the shape of a plate; and A method for manufacturing a heat dissipation busbar for a wiring circuit breaker, comprising a heat dissipation fin forming step of forming a plurality of heat dissipation fins on the upper surface of the body of the above busbar through skiving processing.

5. In paragraph 4, After the above busbar processing step, It further includes a step of forming a step portion by processing the upper surface of the terminal portion so that a height difference greater than the thickness of the heat dissipation fin is formed between the body portion and the terminal portion. A method for manufacturing a heat dissipation busbar for a wiring circuit breaker, characterized in that after forming a heat dissipation fin through skiving processing in the above heat dissipation fin forming step, the step portion disappears and the space between the body portion and the terminal portion becomes flat.

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