A molded case circuit breaker

Abstract

This invention discloses a molded case circuit breaker, comprising: a base body; a reinforcing member including a horizontal portion and a vertical portion, the horizontal portion being connected to the vertical portion, the horizontal portion being embedded in the bottom surface of the base body, and the vertical portion being embedded in the corresponding long side surface of the base body; the strength of the reinforcing member being greater than the strength of the base body; the reinforcing member and the base body being integrally injection molded to form the base; and an arc-extinguishing chamber being partially or entirely embedded and fixed within the base. The reinforcing member increases the strength of the base, thereby improving the overall strength of the base and ensuring that even with a rapid increase in internal gas pressure after the rated voltage is increased, the base will not crack or be damaged. This structural design of the reinforcing member increases the connection area between the reinforcing member and the base body, improving the overall strength of the base. Furthermore, this structural design creates a tensile force; when the base is subjected to the impact force generated by an explosion, the connection between the horizontal and vertical portions increases the strength of the connection, ensuring that the base will not break.

Description

Technical Field

[0001] This invention relates to the field of electrical technology, and more specifically to a molded case circuit breaker. Background Technology

[0002] Low-voltage molded case circuit breakers (MCCBs) are protective electrical devices that trip to interrupt the fault current when a short circuit occurs. In renewable energy applications, conventional low-voltage MCCBs with rated voltages of AC400V or lower cannot meet the application requirements. To meet the power distribution needs of centralized and string photovoltaic power generation, the rated voltage of the MCCB needs to be increased, such as to AC800V or AC1000V. However, once the rated voltage of a conventional low-voltage MCCB is increased to AC800V or AC1000V, the explosive energy generated by the arc during the interruption of the short-circuit fault current is extremely high. The circuit breaker's casing is very prone to cracking and damage due to the large energy interruption. Increasing the rated voltage while maintaining the existing size, and ensuring that the casing does not crack, has become a pressing problem for those skilled in the art. Summary of the Invention

[0003] Therefore, the technical problem to be solved by this invention is how to improve the strength of the casing. A molded case circuit breaker includes: Base body; The reinforcing member includes a horizontal portion and a vertical portion, the horizontal portion is connected to the vertical portion, the horizontal portion is embedded into the bottom surface of the base body, and the vertical portion is embedded into the corresponding long side surface of the base body. The strength of the reinforcing member is greater than the strength of the base body. The reinforcing member and the base body are integrally injection molded to form the base. An arc-extinguishing chamber, which is partially or entirely located within the base.

[0004] The number of reinforcing members is at least two, and the reinforcing members are L-shaped structures; or, the number of reinforcing members is at least one, and the reinforcing member has two vertical parts and one horizontal part, one side of the horizontal part is connected to one of the vertical parts, and the other side of the horizontal part is connected to the other vertical part, forming a U-shaped structure.

[0005] The base has several chambers, each corresponding to a phase circuit. The area covered by the outer contour of the reinforcing member's orthographic projection toward the bottom surface of the chamber is Sa, and the area of ​​the bottom surface of the chamber is S. Sa is not less than 0.3S.

[0006] The chamber is provided with an exhaust port, and the end of the reinforcing member extends to be close to the exhaust port; or, the end of the reinforcing member extends to the exhaust port.

[0007] The reinforcing member is provided with several flow channel holes.

[0008] It also includes a seal, wherein the base has an exposed hole communicating with the reinforcement, and the seal seals the exposed hole.

[0009] The seal and the base are connected by a snap-fit, glue, or ultrasonic welding.

[0010] One of the base and the seal is provided with a positioning post, and the other of the base and the seal is provided with a positioning hole that cooperates with the positioning post.

[0011] The reinforcing member is made of plastic; or, the reinforcing member is made of metal.

[0012] The reinforcing member is provided with a clearance hole for avoiding the insertion nut; or, the reinforcing member and the insertion nut are integrally formed; or, the horizontal portion is provided with a first reinforcing rib arranged along a first direction; the vertical portion is provided with a second reinforcing rib arranged along a second direction, the first direction and the second direction being spatially perpendicular; or, a third reinforcing rib is provided at the connection between the horizontal portion and the vertical portion.

[0013] The technical solution of this invention has the following advantages: 1. The molded case circuit breaker provided by this invention increases the strength of the base by setting a reinforcing member, thereby improving the overall strength of the base and ensuring that even if the internal air pressure increases sharply after the rated voltage is increased, the base will not crack or be damaged. The reinforcing member adopts this structural setting, which increases the connection area between the reinforcing member and the base body, thereby improving the overall strength of the base. Secondly, this structural setting forms a tension force, which improves the strength of the connection between the horizontal and vertical parts when the base is subjected to the impact force generated by an explosion, ensuring that the base will not break.

[0014] 2. The molded case circuit breaker provided by this invention features an L-shaped or U-shaped reinforcing member to enhance the strength of the base. Alternatively, the reinforcing member can also employ other structures, such as being externally mounted on the long side of the base to provide a protective effect.

[0015] 3. The molded case circuit breaker provided by this invention has a limited area ratio between Sa and S, which further improves the overall strength of the base. In addition, the length of the reinforcing member and the length of the long side of the base are also limited.

[0016] 4. The molded case circuit breaker provided by the present invention has a reinforcing member that extends to the exhaust port, thereby increasing the strength of the exhaust port and ensuring its strength in the event of an explosion.

[0017] 5. The molded case circuit breaker provided by the present invention has flow channel holes that facilitate the flow of injection molding material during injection molding, making molding easier and reducing air bubbles.

[0018] 6. The molded case circuit breaker provided by the present invention has exposed holes formed during the manufacturing process, which are sealed by a sealing element to form an insulating isolation.

[0019] 7. The molded case circuit breaker provided by the present invention has a positioning post and a positioning hole that form a positioning and fixing effect to prevent the seal from shaking.

[0020] 8. The molded case circuit breaker provided by this invention features reinforcing ribs that increase the strength of the reinforcing member; secondly, the reinforcing ribs can increase the contact area between the reinforcing member and the base body, improving the stability of the connection between the two; furthermore, the staggered directions of the first and second reinforcing ribs create a force decomposition in different directions, which can provide buffering and tensile resistance, and also indirectly increase the strength of the entire base; the molded case circuit breaker provided by this invention also features a third reinforcing rib that increases the strength of the connection between the horizontal and vertical parts. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 A cross-sectional view of a molded case circuit breaker provided by the present invention; Figure 2 for Figure 1 A sectional view; Figure 3 This is a partial structural schematic diagram of a molded case circuit breaker provided by the present invention; Figure 4 for Figure 3 Exploded view; Figure 5 A schematic diagram of the structure of the reinforcing member provided by the present invention; Figure 6 A schematic diagram of another form of the reinforcing member provided by the present invention; Figure 7 A cross-sectional view of the seal provided by the present invention.

[0023] Explanation of reference numerals in the attached figures: 11. Base body; 12. Reinforcing member; 13. Base; 14. Arc-extinguishing chamber; 15. Sealing member; 16. Positioning post; 17. Positioning hole; 121. Horizontal part; 122. Vertical part; 123. Third reinforcing rib; 124. Flow channel hole; 125. Clearance hole; 131. Chamber; 132. Exhaust port; 133. Exposed hole; 1211. First reinforcing rib; 1221. Second reinforcing rib. Detailed Implementation

[0024] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0028] Example 1 This embodiment provides a molded case circuit breaker, as shown in the attached diagram. Figures 1-7 As shown, Base body 11; The reinforcing member 12 includes a horizontal portion 121 and a vertical portion 122. The horizontal portion 121 is connected to the vertical portion 122. The horizontal portion 121 is embedded in the bottom surface of the base body 11, and the vertical portions 122 are embedded in the corresponding long side surfaces of the base body 11. In this embodiment, the base body 11 has two long side surfaces, meaning that the vertical portion 122 is embedded in both long side surfaces of the base body 11. Here, the horizontal portion 121 is located in the horizontal direction, and the vertical portion 122 is located in the vertical direction. The horizontal portion 121 and the vertical portion 122 are connected, and at this time, the horizontal portion 121 and the vertical portion 122 are vertically connected. The horizontal portion 121 is embedded in the bottom surface of the base body 11, and the vertical portion 122 is embedded in the long side surface of the base body 11. In this case, the bottom surface of the base body 11 and the horizontal portion 121 cooperate to form the bottom surface of the base 13, and the long side surface of the base body 11 and the vertical portion 122 cooperate to form the long side surface of the base 13.

[0029] The strength of the reinforcing member 12 is greater than the strength of the base body 11. The reinforcing member 12 and the base body 11 are integrally injection molded to form the base 13. Here, integral injection molding means that during the injection molding process, the reinforcing member 12 is placed into the cavity of the mold and injected into the cavity through the colloid, and finally injection molded to form the base 13.

[0030] The arc-extinguishing chamber 14 is partially or entirely located within the base 13. The positional relationship between the arc-extinguishing chamber 14 and the base 13 can be adjusted according to actual needs. The arc-extinguishing chamber 14 corresponds to the breaking position of the moving and stationary contacts. The circuit breaker breaks the short-circuit fault current, and its breaking position is located in the arc-extinguishing chamber 14. That is, when the molded case circuit breaker explodes, the base 13 is the core area of ​​the explosion. By incorporating the reinforcing member 12, the strength of the base 13 is increased, thereby enhancing the overall strength of the base 13. This ensures that even with a rapid increase in internal air pressure after the rated voltage is increased, the base 13 will not crack or be damaged. The reinforcing member 12's structural design increases the connection area between it and the base body 11, further enhancing the overall strength of the base 13. Furthermore, this structural design creates a tensile force (when the long side of the base 13 is impacted, the bottom surface of the base 13 still pulls on the long side, increasing its strength). When the base 13 is subjected to the impact force generated by an explosion, the connection between the horizontal portion 121 and the vertical portion 122 enhances the strength of the connection, ensuring that the base 13 will not break.

[0031] Specifically, as shown in the attached document Figures 4-6As shown, there are at least two reinforcing members 12, and each reinforcing member 12 has an L-shaped structure. Specifically, the L-shaped structure means that the horizontal portion 121 and the vertical portion 122 are perpendicularly connected to form an L-shape. The number of reinforcing members 12 is at least two; for example, when there are two reinforcing members 12, they can be symmetrically arranged or diagonally arranged. When there are three reinforcing members 12, those skilled in the art can use other layout methods. Alternatively, there can be at least one reinforcing member 12, which has two vertical portions 122 and one horizontal portion 121. One side of the horizontal portion 121 is connected to one of the vertical portions 122, and the other side of the horizontal portion 121 is connected to the other vertical portion 122, forming a U-shaped structure. When the reinforcing member 12 is U-shaped, there is at least one reinforcing member 12, and this reinforcing member 12 cooperates with the base body 11. When there are two reinforcing members 12, they are arranged in parallel, which can also improve the strength of the base 13. The reinforcing member 12 is L-shaped or U-shaped to increase the strength of the base 13. In addition, the reinforcing member 12 can also adopt other structures, such as being externally placed on the long side of the base 13 to form a protective effect. It should be noted that there are many differences between external and internal placement. The internal placement can be integrally molded to form a whole, and the reinforcing member 12 will not fall off or separate, and is firmly fixed.

[0032] Specifically, as shown in the attached document Figures 1-4 As shown, the base 13 has several chambers 131, each corresponding to one phase of the circuit. For example, the circuit breaker includes a three-phase circuit: phase A, phase B, and phase C. Phase B is located between phase A and phase C, meaning phase A and phase C are located on opposite sides. It should be noted that the three chambers 131 have the same dimensions. The area covered by the outer contour of the reinforcing member 12 projected onto the bottom surface of the chamber 131 is Sa, and the area of ​​the bottom surface of the chamber 131 is S. Sa is not less than 0.3S. This area ratio between Sa and S further enhances the overall strength of the base 13.

[0033] Specifically, as shown in the attached document Figures 1-4As shown, chamber 131 is provided with an exhaust port 132, which is connected to the outside. That is, the electric arc is extinguished by the arc-extinguishing chamber 14 and finally discharged through the exhaust port 132. The end of the reinforcing member 12 extends close to the exhaust port 132; specifically, this end refers to the end of the reinforcing member 12 extending along the length of the base 13. Alternatively, the end of the reinforcing member 12 extends to the exhaust port 132. The end of the reinforcing member 12 can be close to the exhaust port 132, can just reach the exhaust port 132, or can extend into the exhaust port 132; those skilled in the art can adjust this according to actual needs. The reinforcing member 12, by extending to the exhaust port 132, increases the strength of the exhaust port 132, ensuring the strength of the exhaust port 132 in the event of an explosion.

[0034] Specifically, as shown in the attached document Figures 5-6 As shown, the reinforcing member 12 is provided with a number of flow channel holes 124. The flow channel holes 124 facilitate the flow of injection molding material, making molding easier and reducing air bubbles. The number and shape of the flow channel holes 124 can be adjusted according to actual needs, and can be round holes, square holes, oblong holes, or combinations of multiple hole types.

[0035] Specifically, as shown in the attached document Figures 1-7 As shown, it also includes a seal 15. The base 13 has an exposed hole 133 that connects to the reinforcing member 12, and the seal 15 seals the exposed hole 133. The exposed hole 133 is formed during the manufacturing process, and the seal 15 creates a sealing effect, forming an insulating barrier. The number of exposed holes 133 can be one, two, or three.

[0036] Specifically, the seal 15 and the base 13 are connected by snap-fit, glue, or ultrasonic welding.

[0037] Specifically, as shown in the attached document Figures 1-2 , Figure 7 As shown, one of the base 13 and the seal 15 is provided with a positioning post 16, and the other of the base 13 and the seal 15 is provided with a positioning hole 17 that mates with the positioning post 16. The positioning post 16 and the positioning hole 17 are provided to achieve a positioning and fixing effect, preventing the seal 15 from shaking.

[0038] Specifically, in this embodiment, for example, there are three exposed holes 133. Two exposed holes 133 are located on the inner side of the bottom surface of the base 13 (facing the top cover), and the other exposed hole 133 is located on the outer side of the bottom surface of the base 13 (facing the outside). The three exposed holes 133 form a three-point positioning and fixing effect, making the reinforcing member 12 more stable during the injection molding process. Alternatively, two exposed holes 133 can be located on the outer side of the bottom surface of the base 13, and the other exposed hole 133 can be located on the inner side of the bottom surface of the base 13, which can also achieve the three-point positioning effect.

[0039] Specifically, the positioning pin 16 and the positioning hole 17 are positioned on the inner side of the bottom surface of the base 13, and the sealing element 15 abuts against the arc-extinguishing chamber 14 on the side away from the base 13, so that the arc-extinguishing chamber 14 can strengthen the fixing effect.

[0040] Specifically, the reinforcing member 12 is made of plastic, where the strength of the plastic material is greater than that of the base body 11. Alternatively, the reinforcing member 12 can be made of metal, such as iron, stainless steel, or other high-strength materials.

[0041] Specifically, when the reinforcing member 12 is made of iron, it also has a demagnetizing effect, reducing interference.

[0042] Specifically, the reinforcing member 12 is integrally formed. For example, when the reinforcing member 12 is made of iron, it is integrally formed by bending and stamping.

[0043] Specifically, as shown in the attached document Figures 5-6 As shown, the reinforcing member 12 is provided with a clearance hole 125, which is used to avoid the embedded nut; or, the reinforcing member 12 and the embedded nut are integrally formed. The distance between the reinforcing member 12 and the embedded nut can be adjusted according to actual needs.

[0044] Specifically, as shown in the attached document Figures 5-6 As shown, the horizontal portion 121 is provided with a first reinforcing rib 1211, which is arranged along a first direction, specifically the width direction of the base 13, corresponding to the Y-axis direction. The vertical portion 122 is provided with a second reinforcing rib 1221, which is arranged along a second direction, specifically the length direction of the base 13, corresponding to the X-axis direction. The first and second directions are spatially perpendicular. The reinforcing ribs increase the strength of the reinforcing member 12; secondly, the reinforcing ribs can increase the contact area between the reinforcing member 12 and the base body 11, improving the stability of the connection between the two; furthermore, the staggered directions of the first reinforcing rib 1211 and the second reinforcing rib 1221 create a decomposition of forces in different directions, which can play a buffering and tensile resistance role, and also indirectly increase the strength of the entire base 13. The number of the first reinforcing ribs 1211 and the second reinforcing ribs 1221 can be adjusted according to actual needs.

[0045] Specifically, as shown in the attached document Figures 5-6 As shown, the first reinforcing rib 1211 protrudes towards the top surface of the base 13, and the bottom surface of the horizontal portion 121 has a corresponding groove. The second reinforcing rib 1221 protrudes outward, and the inner side of the vertical portion 122 has a corresponding groove. In this embodiment, the first reinforcing rib 1211 and the second reinforcing rib 1221 are stamped, and their protruding directions are different, which can better increase the contact area between the reinforcing member 12 and the base body 11, and improve the strength of the entire base 13.

[0046] Specifically, as shown in the attached document Figures 5-6 As shown, a third reinforcing rib 123 is provided at the connection between the horizontal portion 121 and the vertical portion 122. The provision of the third reinforcing rib 123 increases the strength of the connection between the horizontal portion 121 and the vertical portion 122. The number of third reinforcing ribs 123 can also be adjusted according to actual needs.

[0047] Specifically, the length of the reinforcing member 12 is half the length of the base 13. Here, half is the most preferred ratio. Those skilled in the art can also adjust it according to actual needs. For example, the length of the reinforcing member 12 is two-thirds the length of the base 13.

[0048] Specifically, the height of the reinforcing member 12 is one-third of the height of the base 13. One-third is the most preferred ratio. Those skilled in the art can also adjust it according to actual needs. For example, the height of the reinforcing member 12 is one-half of the height of the base 13.

[0049] Specifically, the bottom surface of the arc-extinguishing chamber 14 is curved, in which case the sealing element 15 corresponds to and mates with the bottom surface of the arc-extinguishing chamber 14. Alternatively, the bottom surface of the arc-extinguishing chamber 14 is flat.

[0050] Specifically, the arc-extinguishing chamber 14 and the base 13 can be fixed by embedding the arc-extinguishing chamber 14 into the base 13, placing the arc-extinguishing chamber 14 on the base 13, or using a middle seat to cooperate with the base 13, forming a clamping and fixing effect on the arc-extinguishing chamber 14. Here, the middle seat is connected and fixed to the base 13. In addition, those skilled in the art can adjust according to actual needs.

[0051] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A molded case circuit breaker, characterized in that, include: Base body (11); The reinforcing member (12) includes a horizontal part (121) and a vertical part (122). The horizontal part (121) is connected to the vertical part (122). The horizontal part (121) is embedded into the bottom surface of the base body (11). The vertical part (122) is embedded into the corresponding long side surface of the base body (11). The strength of the reinforcing member (12) is greater than the strength of the base body (11). The reinforcing member (12) and the base body (11) are integrally injection molded to form the base (13). Arc-extinguishing chamber (14), which is partially or entirely located within the base (13).

2. The molded case circuit breaker according to claim 1, characterized in that, The number of the reinforcing members (12) is at least two, and the reinforcing members (12) are L-shaped; or, the number of the reinforcing members (12) is at least one, and the reinforcing member (12) is provided with two vertical parts (122) and one horizontal part (121). One side of the horizontal part (121) is connected to one of the vertical parts (122), and the other side of the horizontal part (121) is connected to the other vertical part (122), forming a U-shaped structure.

3. The molded case circuit breaker according to claim 1, characterized in that, The base (13) is provided with a plurality of chambers (131), each chamber (131) corresponding to a phase circuit. The area covered by the outer contour of the orthographic projection of the reinforcing member (12) toward the bottom surface of the chamber (131) is Sa, and the area of ​​the bottom surface of the chamber (131) is S, where Sa is not less than 0.3S.

4. The molded case circuit breaker according to claim 3, characterized in that, The chamber (131) is provided with an exhaust port (132), and the end of the reinforcing member (12) extends to be close to the exhaust port (132); or, the end of the reinforcing member (12) extends to the exhaust port (132).

5. The molded case circuit breaker according to claim 1, characterized in that, The reinforcing member (12) is provided with a plurality of flow channel holes (124).

6. The molded case circuit breaker according to claim 1, characterized in that, It also includes a seal (15), the base (13) having an exposed hole (133) communicating with the reinforcement (12), and the seal (15) sealing the exposed hole (133).

7. The molded case circuit breaker according to claim 6, characterized in that, The seal (15) and the base (13) are connected by a snap-fit, glue, or ultrasonic welding.

8. The molded case circuit breaker according to claim 6, characterized in that, One of the base (13) and the sealing member (15) is provided with a positioning post (16), and the other of the base (13) and the sealing member (15) is provided with a positioning hole (17) that cooperates with the positioning post (16).

9. The molded case circuit breaker according to claim 1, characterized in that, The reinforcing member (12) is made of plastic; or the reinforcing member (12) is made of metal.

10. The molded case circuit breaker according to claim 1, characterized in that, The reinforcing member (12) is provided with a clearance hole (125) for avoiding the insertion nut; or, the reinforcing member (12) and the insertion nut are integrally formed; or, the horizontal part (121) is provided with a first reinforcing rib (1211) arranged along a first direction; the vertical part (122) is provided with a second reinforcing rib (1221) arranged along a second direction, the first direction and the second direction being spatially perpendicular; or, a third reinforcing rib (123) is provided at the connection between the horizontal part (121) and the vertical part (122).

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