Case of molded case circuit breaker

Abstract

Disclosed is a case of a molded case circuit breaker. The case of the molded case circuit breaker prevents components arranged in an accommodation space of the case from being contaminated with scatter generated by arc and carbon thin films, and thus improves the withstand voltage performance of the molded case circuit breaker. The case of a molded case circuit breaker, according to an embodiment of the present invention, is a case provided to the molded case circuit breaker. The case accommodates a base assembly. The case is provided with an arc passage through which arc generated inside the base assembly moves. The arc passage is integrated with the case.

Description

Case of circuit breaker for wiring

[0001] The present invention relates to a case provided in a wiring circuit breaker.

[0002] A molded case circuit breaker (MCCB) is a type of circuit breaker that is an electrical device that cuts off the flow of electricity to prevent electrical accidents when a fault current such as a leakage current or overcurrent occurs.

[0003] A typical circuit breaker contains fixed and movable contacts internally. During normal current flow (not fault current), the fixed and movable contacts are in contact with each other, allowing current to flow. However, when a fault current occurs, the fixed and movable contacts separate, interrupting current flow.

[0004] When the fixed and movable contacts are separated, an arc is generated by the fault current flowing between the fixed and movable contacts. The generated arc is extinguished and then discharged to the outside of the circuit breaker.

[0005] The generated arc can be defined as a flow of high temperature, high pressure electrons.

[0006] The higher the breaking capacity of a circuit breaker, the more arcs it emits. This causes the circuit breaker's interior to become contaminated with flying debris and soot-like carbon films. This contamination reduces the circuit breaker's withstand voltage performance, which can lead to safety hazards.

[0007] The generated arc is discharged outside the case through a duct in the case. The duct in the case is a passage through which the arc is discharged.

[0008] The case of a conventional wiring circuit breaker has no duct, has a duct structure with a through hole formed on the bottom of the case, or has a duct-separated structure by adding a separate component to the inside of the case.

[0009] Conventional circuit breakers lacking a duct structure in their case face the problem of increased contamination of components located within the case. Furthermore, if a separate through-hole is formed on the underside of the case, arc discharge becomes difficult. Furthermore, if additional components are added to form the duct, manufacturing costs and manufacturing time increase due to the additional components.

[0010] Therefore, there is a need for a case for a wiring circuit breaker that reduces contamination of components placed inside the case, facilitates arc discharge, and reduces manufacturing cost and manufacturing time.

[0011] Additionally, to prevent the deterioration of the withstand voltage performance due to the occurrence of arcs, the distance between components with high contamination must be minimized and the duct size must be sufficiently secured.

[0012] The purpose of the present invention is to provide a case for a wiring circuit breaker that prevents contamination of components placed inside the case and smoothly discharges arcs.

[0013] The above-described object of the present invention is achieved by the following.

[0014] A case for a circuit breaker according to an embodiment of the present invention is a case provided in a circuit breaker. The case houses a base assembly. The case has an arc passage through which an arc generated within the base assembly travels. The arc passage is formed integrally with the case.

[0015] Specifically, the arc passage is formed by an arc shield formed integrally with the case.

[0016] Specifically, the arc shield is formed at a predetermined distance from the bottom in the thickness direction of the bottom of the case. The arc passage is a space of a predetermined volume formed between the bottom and the arc shield.

[0017] Specifically, the above arc shield is formed by being integrally connected to one side wall and the other side wall of the case.

[0018] Specifically, the arc shielding plate includes a side shielding plate. And, the case includes a side internal partition formed inside the case. The side shielding plate is integrally connected to a side wall portion of the case and the side internal partition. The arc passage includes a side arc passage. The side arc passage is a space surrounded by the bottom portion of the case, a side wall portion, a side shielding plate, and the side internal partition.

[0019] Specifically, the arc shielding plate includes a middle shielding plate. And, the case includes a side inner partition wall and a side middle partition wall formed inside the case. The middle side shielding plate is integrally connected to the side inner partition wall and the side middle partition wall. The arc passage includes a middle arc passage. The middle arc passage is a space surrounded by the bottom of the case, the side inner partition wall, the middle shielding plate, and the side middle partition wall.

[0020] Specifically, the arc shielding plate includes a second shielding plate. And, the case includes a middle partition wall formed on one side inside the case. The second shielding plate is integrally connected to the middle partition wall on one side and the second side wall portion of the case. The arc passage includes a second arc passage. The second arc passage is a space surrounded by the bottom portion of the case, the middle partition wall on one side, the second shielding plate, and the second side wall portion.

[0021] The case of a circuit breaker according to an embodiment of the present invention has an arc passage formed integrally with the case, thereby having the effect of smoothly discharging the arc to the outside of the circuit breaker without additional parts.

[0022] Alternatively, the case of the circuit breaker according to an example of an embodiment of the present invention has the effect of preventing other components placed in the housing space of the case from being contaminated by flying debris and carbon films generated by an arc, and also has the effect of improving the withstand voltage performance of the circuit breaker accordingly.

[0023] Alternatively, the case of a circuit breaker for wiring according to an example of an embodiment of the present invention has an arc passage formed integrally with the case, thereby having the effect of reducing manufacturing cost and manufacturing time.

[0024] More detailed effects of the case of the circuit breaker according to an example of the embodiment of the present invention are described in the specific contents for implementing the invention below.

[0025] Fig. 1 shows a wiring circuit breaker according to an example of an embodiment of the present invention.

[0026] Figure 2 is an exploded perspective view of the wiring circuit breaker of Figure 1.

[0027] Figure 3 is a cross-sectional view of a base assembly equipped with a handle.

[0028] Figure 4 is a perspective view showing the case illustrated in Figure 2.

[0029] Fig. 5 is a perspective view showing one side wall portion omitted in the case of Fig. 4.

[0030] Figure 6 is a side view of the case illustrated in Figure 5.

[0031] Figure 7 is a front view of Figure 4.

[0032] Figure 8 is a back view of Figure 4.

[0033] Figure 9 is a plan view of Figure 4.

[0034] Fig. 10 is a bottom view of Fig. 4.

[0035] Hereinafter, examples of embodiments of the present invention will be described in more detail with reference to the attached drawings. For components of the present invention that are clearly understandable and easily reproducible by those skilled in the art using conventional techniques, a detailed description thereof will be omitted so as not to obscure the gist of the present invention.

[0036] The attached drawings are only provided to facilitate understanding of examples of embodiments disclosed in this specification, and the technical ideas disclosed in this specification are not limited by the attached drawings.

[0037] Singular expressions include plural expressions unless the context clearly indicates otherwise.

[0038] Additionally, terms including ordinal numbers, such as "first" and "second," used herein may be used to describe various components, but these components should not be limited by these terms. These terms are used solely to distinguish one component from another. For example, without departing from the scope of the present invention, a first component could be referred to as a "second component," and similarly, a second component could also be referred to as a "first component."

[0039] In general, a molded case circuit breaker (MCCB) 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.

[0040] Below, a case of a molded case circuit breaker according to examples of an embodiment of the present invention is described.

[0041] FIG. 1 illustrates a wiring circuit breaker according to examples of an embodiment of the present invention, and FIG. 2 is an exploded perspective view of the wiring circuit breaker of FIG. 1.

[0042] Referring to FIGS. 1 and 2, a circuit breaker (10) for wiring according to an example of an embodiment of the present invention includes a case (12), a case cover (11), and a plurality of base assemblies (13).

[0043] The case (12) and the case cover (11) form the exterior of a wiring circuit breaker (10) according to an example of an embodiment of the present invention.

[0044] The case (12) and the case cover (11) can be combined to form a polyhedron (e.g., a hexahedron) having an internal accommodation space.

[0045] Specifically, the case (12) and the case cover (11) are combined, and a receiving space (12h) is formed inside the case (12) and the case cover (11) through the combination. The combination can be achieved by a fastening member such as a bolt, a nut, or a screw.

[0046] The case (12) and the case cover (11) further include other components (e.g., holes into which bolts or screws are inserted, grooves into which nuts are inserted, etc.) that allow them to be fastened to each other by a fastening member.

[0047] A plurality of base assemblies (13) are accommodated in a receiving space (12h) formed by combining the case (12) and the case cover (11).

[0048] Figures 4 to 10 illustrate a case (12) of a circuit breaker (10) for wiring of the present invention. Figure 4 is a perspective view illustrating the case (12), Figure 5 illustrates that a side wall portion (124) is omitted from the case (12), Figure 6 is a side view of the case (12) viewed from one side, Figure 7 is a front view of the case (12), Figure 8 is a rear view of the case (12), Figure 9 is a plan view of the case (12), and Figure 10 is a bottom view of the case (12).

[0049] Referring to FIGS. 1, 2, 4 to 10, the case (12) can be formed in a box shape with one side (the upper side in the drawing) open and an accommodation space (12h) inside.

[0050] The accommodation space (12h) of the case (12) is divided into a plurality of accommodation spaces (12h1, 12h2, 12h3) (see Fig. 9).

[0051] A plurality of base assemblies (13) are respectively arranged in each of the plurality of receiving spaces (12h1, 12h2, 12h3).

[0052] The case (12) has a bottom part (121). The bottom part (121) represents, for example, the bottom plate of a box.

[0053] The bottom part (121) is formed in a plate shape.

[0054] Specifically, the bottom portion (121) is formed in a plate shape having a preset length (length in the y direction in the drawing), a preset width (length in the x direction in the drawing), and a preset thickness (length in the z direction in the drawing).

[0055] The bottom part (121) can be formed with curves, steps, holes, grooves, etc. according to the user's needs.

[0056] In addition, the case (12) has one side (122) and the other side (123), one side wall (124) and the other side wall (125).

[0057] The above one side (122) and the other side (123), one side wall (124) and the other side wall (125) represent, for example, side plates of a box.

[0058] One side (122) and the other side (123), one side wall (124) and the other side wall (125) are formed along the edge of the bottom (121) in a direction perpendicular to the bottom (121).

[0059] One side (122) and the other side (123) are spaced apart by a preset distance and placed facing each other.

[0060] One side (122) and the other side (123) each have one end and one end. The one end and the other end are opposite ends.

[0061] A plurality of one-sided openings (122h) penetrating the one-sided portion (122) are formed between one end (1221) and the other end (1222) of the one-sided portion (122) (see Fig. 2).

[0062] Additionally, a plurality of other side openings (123h) penetrating the other side (123) are formed between one end (1231) and the other end (1232) of the other side (123) (see FIG. 4).

[0063] A terminal connected to the load side is arranged in the above one-side opening (122h), and a terminal connected to the power side is arranged in the other-side opening (123h).

[0064] The interior of the case (12) is electrically connected to the exterior by the above-mentioned one-sided opening (122h) or the other-sided opening (123h). The connection is achieved by the electrically conductive portion (138) penetrating the interior and exterior of the case (12) and being coupled to the case (12).

[0065] One side wall (124) and the other side wall (125) are spaced apart by a preset distance and placed facing each other.

[0066] One side wall portion (124) and the other side wall portion (125) each have one end and the other end. The one end and the other end are opposite ends.

[0067] Each of the one side wall (124) and the other side wall (125) is formed in a plate shape.

[0068] Specifically, each of the one side wall portion (124) and the other side wall portion (125) is formed into a plate shape having a preset length (length in the y direction in the drawing), a preset thickness (length in the x direction in the drawing), and a preset width (length in the z direction in the drawing).

[0069] One side (122) and the other side (123), and one side wall (124) and the other side wall (125) are connected to each other.

[0070] Specifically, one end (1221) of one side (122) is connected to one end (1241) of one side wall (124), and the other end (1222) of one side (122) is connected to one end (1251) of the other side wall (125).

[0071] And, one end (1231) of the other side (123) is connected to the other end (1242) of the one side wall (124), and the other end (1232) of the other side (123) is connected to the other end (1252) of the other side wall (125).

[0072] The accommodation space (12h) of the case (12) represents a space surrounded by the bottom (121), one side (122), the other side (123), one side wall (124), and the other side wall (125).

[0073] The above bottom part (121), one side part (122) and the other side part (123), one side wall part (124) and the other side wall part (125) can be formed as one piece. The above-mentioned integral part means that the bottom part (121), one side part (122) and the other side part (123), one side wall part (124) and the other side wall part (125) are each separate, and the joining parts of the bottom part (121), one side part (122) and the other side part (123), one side wall part (124) and the other side wall part (125) are not connected (fastened) by welding, adhesive, fastening members, or the like, but the bottom part (121), one side part (122) and the other side part (123), one side wall part (124) and the other side wall part (125) are continuous as one piece without physical disconnection. This can be manufactured, for example, using an injection molding method.

[0074] The case (12) is formed of an insulating material such as plastic or synthetic resin. Accordingly, safety accidents that may occur due to the random passage of current through the case (12) can be prevented.

[0075] The case cover (11) serves to cover the case (12). By the case cover (11), components (e.g., base assembly (13), etc.) placed in the receiving space (12h) of the case (12) are not exposed to the outside.

[0076] The case cover (11) can be formed into a box shape with one side (the lower side in the drawing) open and an accommodation space inside.

[0077] The top plate of the case cover (11) can be formed with curves, steps, holes, grooves, etc. according to the user's needs.

[0078] A through hole penetrating the top plate of the case cover (11) is formed. A handle (1351) is placed in the through hole.

[0079] The case cover (11) has side plates formed along the edges of the top plate in a direction perpendicular to the top plate.

[0080] The side plates formed on the case cover (11) can be connected to one side (122), the other side (123), one side wall (124) and / or the other side wall (125) formed on the case (12). The connection can be made by a fastening member as described above.

[0081] In the receiving space (12h) of the case (12), components are mounted to cut off current when a fault current (accident current) occurs and to extinguish the generated arc (A).

[0082] Specifically, a plurality of base assemblies (13) are accommodated in the accommodation space (12h) of the case (12). That is, a plurality of base assemblies (13) are arranged in the accommodation space (12h) of the case (12). Three base assemblies (13a, 13b, 13c) are illustrated in Fig. 2.

[0083] The plurality of base assemblies (13) illustrated in FIG. 2 include a first base assembly (13a), a second base assembly (13b), and a third base assembly (13c).

[0084] Among the plurality of base assemblies (13), the first base assembly (13a) is placed in the first receiving space (12h1) of the case (12) described later, the second base assembly (13b) is placed in the second receiving space (12h2), and the third base assembly (13c) is placed in the third receiving space (12h3).

[0085] The first base assembly (13a) is disposed on one side of the case (12) wall (124), the second base assembly (13b) is disposed on one side of the first base assembly (13a), and the third base assembly (13c) is disposed on the other side of the case (12) wall (125). The second base assembly (13b) is disposed between the first base assembly (13a) and the third base assembly (13c).

[0086] The structure of each of the plurality of base assemblies (13) (for example, three as shown in FIG. 2) is identical or similar, but one of the plurality of base assemblies (13) (for example, the middle base assembly (13b) among the base assemblies (13) shown in FIG. 2) is equipped with a handle (1351) (see FIG. 1).

[0087] Figure 3 is a cross-sectional view of a base assembly (13b) equipped with a handle (1351).

[0088] The plurality of base assemblies (13) may be formed with the same or similar structure, except for the handle (1351) and various components that allow the handle (1351) to be mounted.

[0089] Although three base assemblies (13a, 13b, 13c) are illustrated in FIG. 2, the present invention is not limited thereto. Four or more base assemblies (13) may be arranged according to the user's needs.

[0090] A plurality of base assemblies (13) are connected to each other. Each of the plurality of base assemblies (13) includes several components that allow the plurality of base assemblies (13) to be connected to each other.

[0091] A plurality of base assemblies (13) are connected to each other and are energized or de-energized simultaneously.

[0092] One of the plurality of base assemblies (13) is equipped with a handle (1351) and various components for mounting the handle (1351).

[0093] By operating the above handle (1351), multiple base assemblies (13) are simultaneously energized or de-energized.

[0094] As described above, the components and operating principles that allow multiple base assemblies (13) to be connected to each other and simultaneously energized or de-energized are in accordance with known technology.

[0095] Referring to FIGS. 2 and 3, the base assembly (13) includes a base cover (131) and a fixed contact (132), a movable contact (133), an opening / closing mechanism (135), an arc extinguishing part (134), and a trip part (136) accommodated in the base cover (131). The trip part (136) represents the trip assembly (136) illustrated in FIG. 2.

[0096] The base cover (131) forms the exterior of the base assembly (13).

[0097] The base cover (131) has an internal storage space and can be formed in a polyhedral shape (e.g., a hexahedral shape). Each face of the polyhedron can be formed with curves, steps, holes, grooves, etc. according to the user's needs.

[0098] The base cover (131) is provided with a first base cover (1311) and a second base cover (1312) that are physically separated for the convenience of assembling the components that make up the base assembly (13).

[0099] The first base cover (1311) and the second base cover (1312) are manufactured separately and can be joined together. The joining can be achieved by fastening members such as bolts, nuts, screws, etc.

[0100] The first base cover (1311) and the second base cover (1312) form the exterior of the base assembly (13). The first base cover (1311) may be placed on the left side, for example, and the second base cover (1312) may be placed on the right side, for example.

[0101] According to an example of an embodiment of the present invention, the first base cover (1311) and the second base cover (1312) may be formed to be symmetrical to each other. That is, the first base cover (1311) and the second base cover (1312) may be formed such that one side facing each other has the same structure. Similarly, the first base cover (1311) and the second base cover (1312) may be formed such that the other side facing each other has the same structure.

[0102] A space is formed inside each of the first base cover (1311) and the second base cover (1312). The spaces are connected to each other as the first base cover (1311) and the second base cover (1312) are joined. A fixed contact (132), a movable contact (133), an opening / closing mechanism (135), an arc extinguishing part (134), and a trip part (136) are accommodated in the spaces.

[0103] When a fault current (fault current) is applied to the wiring circuit breaker (10), an operation to cut off the fault current is performed in the base assembly (13) connected to each phase, and at the same time, the heat and pressure generated are discharged through the exhaust port.

[0104] Meanwhile, the trip unit (136) functions to cut off the current flowing outside and inside the circuit breaker (10) when a fault current (fault current) flows through the circuit breaker (10). In other words, the trip unit (136) detects an overcurrent or short-circuit current flowing in the circuit and induces a trip operation of the switching mechanism (135).

[0105] The trip unit (136) is accommodated in a part of the case (12). The trip unit (136) is energized and connected to the fixed contact (132).

[0106] The trip unit (136) includes a trip bar, a shooter, an elastic member, etc. to perform a function. When the trip unit (136) is operated, the opening / closing mechanism (135) connected to the trip unit (136) is operated, so that an external user can easily recognize that a trip operation has been performed.

[0107] Since the operation process of the trip unit (136) and the process of the opening / closing mechanism unit (135) being operated by the trip unit (136) are well-known techniques, a detailed description thereof will be omitted.

[0108] An opening / closing mechanism (135) is placed (or mounted) on one of the plurality of base assemblies (13).

[0109] The opening / closing mechanism (135) moves the movable contact (133) to provide the power required to open / close the circuit.

[0110] The opening / closing mechanism (135) includes a handle (1351) and various components that allow the handle (1351) to be mounted and driven.

[0111] The opening / closing mechanism (135) is connected to the shaft (137), and when the opening / closing mechanism (135) rotates, the shaft (137) also rotates. That is, the shaft (137) can rotate by receiving the force of the opening / closing mechanism (135).

[0112] The opening / closing mechanism (135) rotates by the operation of the trip unit (136). Accordingly, the shaft (137) also rotates, and the fixed contact (132) and the movable contact (133) come into contact with each other or are separated (spaced apart).

[0113] A rotary pin (1371) is installed through the shaft (137). The shaft (137) receives the opening and closing power of the opening and closing mechanism (135) through the rotary pin (1371) and rotates. As the shaft (137) rotates, the movable contact (133) also rotates and comes into contact with or is separated (spaced) from the fixed contact (132).

[0114] The process of rotating the opening / closing mechanism (135) and shaft (137) by the operation of the trip unit (136) is a well-known technology, so a detailed description thereof is omitted.

[0115] The movable contact (133) is rotatably arranged (or mounted) on the shaft (137).

[0116] The movable contact (133) is rotated counterclockwise or clockwise together with the shaft (137) or independently, and is brought into contact with or separated (spaced apart) from the fixed contact (132). When the movable contact (133) and the fixed contact (132) are in contact, the circuit is energized, and when the movable contact (133) and the fixed contact (132) are separated (spaced apart), the circuit is not energized (in other words, is cut off).

[0117] The fixed contact (132) is placed at a preset distance from the movable contact (133).

[0118] An arc extinguishing part (134) is arranged around the part where the fixed contact (132) and the movable contact (133) come into contact with each other or are separated.

[0119] When the circuit is in a normal state, the fixed contact (132) and the movable contact (133) make contact, and current flows through the circuit.

[0120] On the other hand, when a fault current occurs in the circuit, a trip operation is performed by the operation of the trip unit (136) and the opening / closing mechanism unit (135). That is, the movable contactor (133) rotates and is separated (spaced) from the fixed contactor (132), and the current in the circuit is cut off. At this time, an arc (Arc) (A) is generated around the part where the movable contactor (133) and the fixed contactor (132) are separated (see Fig. 3).

[0121] The size (strength) of the above arc (A) is proportional to the size of the current. The arc (A) is a state in which gas in the atmosphere is instantaneously turned into a plasma state by voltage. The temperature at the center of the arc (A) reaches 8,000°C to 12,000°C and has explosive expansion pressure. As a result, the arc (A) melts and consumes the contacts (132, 133) and deteriorates and destroys the surrounding components.

[0122] The persistence of the arc (A) has a significant impact on the performance and durability of the circuit breaker. Therefore, the arc (A) must be quickly blocked, extinguished, and discharged within the arc extinguishing section (134).

[0123] The arc extinguishing unit (134) extinguishes the arc (A) that occurs when a fault current is interrupted.

[0124] The arc (A) is divided into short arcs as it passes between the grids (1341), and the voltage of the arc (A) increases. In addition, the voltage of the arc (A) increases further due to the arc extinguishing gas, such as SF6, present in the arc extinguishing part (134). Accordingly, the arc (A) is extinguished as the emission of free electrons is suppressed.

[0125] An arc (A) occurs when the fixed contact (132) and the movable contact (133) are separated (spaced). The arc (A) passes through the arc extinguishing section (134) and the arc passage (128) of the case (12) described below, is extinguished, and is discharged to the outside of the wiring circuit breaker (10).

[0126] The arc extinguishing portion (134) is located adjacent to the position where the fixed contact (132) and the movable contact (133) come into contact. Specifically, the arc extinguishing portion (134) is located adjacent to the position where the fixed contact (132) and the movable contact (133) come into contact and the path along which the movable contact (133) rotates. Therefore, the arc (A) extending along the movable contact (133) easily enters the arc extinguishing portion (134).

[0127] A plurality of arc extinguishing parts (134) may be provided. The plurality of arc extinguishing parts (134) are each placed adjacent to the positions where the fixed contact (132) and the movable contact (133) come into contact.

[0128] The arc shield (134) includes a support plate (unsigned) and a grid (1341).

[0129] A plurality of support plates may be provided. The plurality of support plates are arranged to face each other and spaced apart from each other, and support the grid (1341) from both sides.

[0130] The grid (1341) applies a magnetic force to the generated arc (A). By the magnetic force applied by the grid (1341), the generated arc (A) passes through the grid (1341) and is extinguished, and is discharged to the outside of the circuit breaker (10).

[0131] The grid (1341) is formed of a magnetic material. It is intended to apply an attractive force to the arc (A), which is a flow of electrons, and to cause the generated arc (A) to flow to the arc outlet.

[0132] The grid (1341) may have a predetermined space formed on one side facing the movable contact (133). The movable contact (133) may rotate while passing through the space. The rotation path of the movable contact (133) is located between the grids (1341). Accordingly, the arc (A) may be guided through the grid (1341).

[0133] A plurality of grids (1341) may be provided. The plurality of grids (1341) are stacked and spaced apart from each other. The generated arc (A) is extinguished and moves through the space formed between the grids (1341).

[0134] A plurality of grids (1341) can be stacked vertically and can be stacked at an angle depending on the position of the passage through which the arc (A) is discharged. Accordingly, the arc (A) can pass through the space between the plurality of grids (1341) and smoothly move toward the passage through which the arc (A) is discharged.

[0135] Meanwhile, the accommodation space (12h) of the case (12) can be partitioned by a one-side bulkhead (126) and an other-side bulkhead (127).

[0136] One side bulkhead (126) and the other side bulkhead (127) are arranged between a plurality of base assemblies (13) and a plurality of trip assemblies (136), and serve to separate and fix (limit movement) the plurality of base assemblies (133) and the plurality of trip assemblies (136).

[0137] One side bulkhead (126) and the other side bulkhead (127) are internal bulkheads formed in the receiving space (12h) of the case (12).

[0138] By one side bulkhead (126) and the other side bulkhead (127), the receiving space (12h) of the case (12) is divided into a plurality of receiving spaces (12h1, 12h2, 12h3) (see Fig. 9).

[0139] One side bulkhead (126) and the other side bulkhead (127) are formed by protruding (or extending) from the bottom (121) in a direction perpendicular to the bottom (121).

[0140] One side bulkhead (126) and the other side bulkhead (127) are formed in a plate shape.

[0141] Specifically, one side bulkhead (126) and the other side bulkhead (127) are formed in a plate shape having a preset length (length in the y direction in the drawing), a preset thickness (length in the x direction in the drawing), and a preset width (length in the z direction in the drawing).

[0142] One side bulkhead (126) and the other side bulkhead (127) can be arranged parallel to one side wall portion (124) or the other side wall portion (125).

[0143] Depending on the example of the implementation state, curves, grooves, through holes, or stepped surfaces may be formed on one side bulkhead (126) and the other side bulkhead (127).

[0144] One side bulkhead (126) and the other side bulkhead (127) are formed (or arranged) at a preset distance in the longitudinal direction (y direction in the drawing) of the case (12) (specifically, the bottom part (121)).

[0145] A plurality of one-sided bulkheads (126) are formed.

[0146] The plurality of single-sided bulkheads (126) include a single-sided inner bulkhead (1261) and a single-sided middle bulkhead (1262).

[0147] According to an example of the embodiment, each of the one-side inner bulkhead (1261) and the one-side middle bulkhead (1262) may be formed as a single plate, or may be formed as a pair of two plate types, or may be divided into sections in the longitudinal direction (y direction in the drawing) such that in a certain section, they are formed as a single plate type, and in another certain section, two plate types are formed as a pair and connected to the single plate type.

[0148] One inner bulkhead (1261) and one middle bulkhead (1262) are arranged at a preset distance in the width direction (x direction in the drawing) of the bottom (121).

[0149] One inner bulkhead (1261) is positioned adjacent to one side wall (124), and one middle bulkhead (1262) is positioned adjacent to the other side wall (125).

[0150] The one-sided bulkhead (126) forms a plurality of one-sided openings (122h). That is, a plurality of one-sided openings (122h) are formed by the one-sided inner bulkhead (1261) and the one-sided middle bulkhead (1262) (see Fig. 2).

[0151] One side wall portion (124) and one side inner partition wall (1261) are spaced apart by a preset distance in the width direction (x direction in the drawing) of the bottom portion (121), so that a first one-side opening (122h1) is formed between the one side wall portion (124) and one side inner partition wall (1261).

[0152] And, one side inner bulkhead (1261) and one side middle bulkhead (1262) are spaced apart by a preset distance in the width direction (x direction in the drawing) of the bottom part (121), so that a second one side opening (122h2) is formed between one side inner bulkhead (1261) and one side middle bulkhead (1262).

[0153] And, one side intermediate bulkhead (1262) and the other side wall portion (125) are spaced apart by a preset distance in the width direction (x direction in the drawing) of the bottom portion (121), so that a third one-side opening (122h3) is formed between one side intermediate bulkhead (1262) and the other side wall portion (125).

[0154] Meanwhile, an upper portion (first upper portion) (not assigned a sign) can be formed in the case (12).

[0155] The first upper plate is formed in a plate shape that forgets the upper edge of one side wall (124) and the upper edge of the other side wall (125).

[0156] The first upper portion is formed to a preset size and covers a plurality of one-sided openings (122h). In detail, the first upper portion is connected to the upper edge of one-sided inner bulkhead (1261) and one-sided middle bulkhead (1262).

[0157] A hole communicating with each of the plurality of one-sided openings (122h) can be formed in the first upper portion.

[0158] A plurality of side bulkheads (127) are formed.

[0159] The plurality of side bulkheads (127) include a side inner bulkhead (1271) and a side middle bulkhead (1272).

[0160] According to an example of the embodiment, each of the inner side bulkhead (1271) and the middle side bulkhead (1272) may be formed as a single plate, or may be formed as a pair of two plate types, or may be divided into sections in the longitudinal direction (y direction in the drawing) such that in a certain section, it is formed as a single plate type, and in another certain section, two plate types are formed as a pair and connected to the single plate type.

[0161] The inner bulkhead (1271) on the other side and the middle bulkhead (1272) on the other side are arranged at a preset distance in the width direction (x direction in the drawing) of the bottom part (121).

[0162] The other side inner bulkhead (1271) is arranged adjacent to the one side wall (124), and the other side middle bulkhead (1272) is arranged adjacent to the other side wall (125).

[0163] The other side bulkhead (127) forms a plurality of other side openings (123h). That is, a plurality of other side openings (123h) are formed by the other side inner bulkhead (1271) and the other side middle bulkhead (1272) (see Fig. 4).

[0164] One side wall portion (124) and the other side inner partition wall (1271) are spaced apart by a preset distance in the width direction (x direction in the drawing) of the bottom portion (121), so that a first other side opening (123h1) is formed between the one side wall portion (124) and the other side inner partition wall (1271).

[0165] And, the inner bulkhead (1271) on the other side and the middle bulkhead (1272) on the other side are spaced apart by a preset distance in the width direction (x direction in the drawing) of the bottom part (121), so that a second opening (123h2) on the other side is formed between the inner bulkhead (1271) on the other side and the middle bulkhead (1272) on the other side.

[0166] And, the other side intermediate bulkhead (1272) and the other side wall portion (125) are spaced apart by a preset distance in the width direction (x direction in the drawing) of the bottom portion (121), so that a third other side opening (123h3) is formed between the other side intermediate bulkhead (1272) and the other side wall portion (125).

[0167] A plurality of one-sided openings (122h) and a plurality of other-sided openings (123h) are formed on opposite sides in the longitudinal direction (y direction in the drawing) of the case (12).

[0168] In the case (12), an upper portion (second upper portion) (not assigned a sign) can be formed.

[0169] The second upper plate is formed in a plate shape that forgets the upper edge of one side wall (124) and the upper edge of the other side wall (125).

[0170] The second upper portion is formed to a preset size and covers a plurality of other side openings (123h). In detail, the second upper portion is connected to the upper edge of the other side inner bulkhead (1271) and the other side middle bulkhead (1272).

[0171] A hole communicating with each of the plurality of other side openings (123h) can be formed in the second upper part.

[0172] The plurality of accommodation spaces (12h) of the case (12) include a first accommodation space (12h1), a second accommodation space (12h2), and a third accommodation space (12h3).

[0173] The first receiving space (12h1) is an internal space of the case (12) surrounded by one side wall (124), one side internal partition (1261), and the other side internal partition (1271), and the first base assembly (13a) is arranged therein.

[0174] And, the second receiving space (12h2) is an internal space of the case (12) surrounded by one side inner bulkhead (1261), one side middle bulkhead (1262), the other side inner bulkhead (1271), and the other side middle bulkhead (1272), and the second base assembly (13b) is arranged.

[0175] And, the third receiving space (12h3) is an internal space of the case (12) surrounded by the other side wall (125), one side intermediate bulkhead (1262), and the other side intermediate bulkhead (1272), and the third base assembly (13c) is arranged.

[0176] The case (12) includes an arc shield (129) and an arc passage (128).

[0177] The arc shield (129) acts as a shield to prevent the arc (A) from passing through.

[0178] An arc passage (128) is formed by an arc shield (129).

[0179] The arc shield (129) is formed into a plate shape of a preset size (see FIGS. 4 and 5). A hole (a hole through which the arc is discharged) penetrating the arc shield (129) is not formed in the arc shield (129).

[0180] Specifically, the arc shield (129) is formed into a plate shape having a preset length (length in the y direction in the drawing), a preset width (length in the x direction in the drawing), and a preset thickness (length in the z direction in the drawing).

[0181] The arc shield (129) is spaced apart from the bottom (121) by a preset distance in the thickness direction of the bottom (121) (z direction in the drawing). That is, a space of a preset volume is formed between the bottom (121) and the arc shield (129), and the space becomes an arc passage (128).

[0182] The arc passage (128) communicates with the outside of the case (12).

[0183] The arc passage (128) is a passage through which the arc (A) moves. In FIGS. 3 and 6, the arrows indicate the path through which the arc (A) moves through the arc passage (128).

[0184] The arc (A) generated inside the base assembly (13) is discharged to the outside of the case (12) through the arc discharge port of the base assembly (13) and the arc passage (128) of the case (12).

[0185] The arc shield (129) connects one side wall (124) and the other side wall (125). In detail, one end of the arc shield (129) is connected to one side wall (124), and the other end of the arc shield (129) is connected to the other side wall (125).

[0186] The arc shield (129) is formed integrally with the case (12). Specifically, the arc shield (129) is formed integrally with one side wall portion (124) and the other side wall portion (125) of the case (12). The integrally formed means that the arc shield (129), the one side wall portion (124), and the other side wall portion (125) are each separate, and the joint portions of the arc shield (129), the one side wall portion (124), and the other side wall portion (125) are not connected (fastened) by welding, adhesion, or a fastening member, but that the arc shield (129), the one side wall portion (124), and the other side wall portion (125) are continuous as one without physical disconnection. This can be manufactured, for example, using an injection molding method.

[0187] The arc passage (128) is not formed by combining a separate component with the case (12), but is formed by an arc shield (129) formed integrally with the case (12).

[0188] The arc shield (129) includes a one-side shield (1291), a middle-side shield (1292), and a other-side shield (1293).

[0189] That is, one arc shield (129) can be divided into a one-side shield (1291), a middle-side shield (1292), and a other-side shield (1293) that are connected to each other.

[0190] The arc shield (129) connects multiple one-sided bulkheads (126).

[0191] The arc shield (129) is integrally connected to a plurality of one-sided bulkheads (126). The meaning of the integral means that, as described above, the arc shield (129) and the plurality of one-sided bulkheads (126) are each separate, and the joint portions of the arc shield (129) and the plurality of one-sided bulkheads (126) are not connected (fastened) by welding, adhesion, fastening members, or the like, but that the arc shield (129) and the plurality of one-sided bulkheads (126) are continuous as one without physical disconnection.

[0192] The one-sided shield (1291) is integrally connected to the one-sided wall portion (124) and the one-sided inner bulkhead (1261). Specifically, one end of the one-sided shield (1291) is connected to the inner surface of the one-sided wall portion (124), and the other end of the one-sided shield (1291) is connected to one surface of the one-sided inner bulkhead (1261).

[0193] A one-sided arc passage (1281) is formed by a one-sided cover plate (1291).

[0194] A one-sided arc passage (1281) is a space surrounded by a floor portion (121), a one-sided wall portion (124), a one-sided shield plate (1291), and a one-sided internal bulkhead (1261). In the floor portion (121) positioned below the one-sided shield plate (1291), a hole (a hole through which an arc is discharged) penetrating the floor portion (121) is not formed.

[0195] And, the middle side shield (1292) is integrally connected to the one-side inner bulkhead (1261) and the one-side middle bulkhead (1262). Specifically, one end of the middle side shield (1292) is connected to the other side (the side opposite to the one side) of the one-side inner bulkhead (1261), and the other end of the middle side shield (1292) is connected to one side of the one-side middle bulkhead (1262).

[0196] A middle arc passage (1282) is formed by the middle shield (1292).

[0197] The intermediate arc passage (1282) is a space surrounded by a floor portion (121), a side inner partition (1261), an intermediate side shield (1292), and a side intermediate partition (1262). In the floor portion (121) positioned below the intermediate side shield (1292), a hole (a hole through which an arc is discharged) penetrating the floor portion (121) is not formed.

[0198] And, the other side cover plate (1293) is integrally connected to the one side intermediate bulkhead (1262) and the other side wall portion (125). Specifically, one end of the other side cover plate (1293) is connected to the other surface of the one side intermediate bulkhead (1262), and the other end of the other side cover plate (1293) is connected to the inner surface of the other side wall portion (125).

[0199] The other side arc passage (1283) is formed by the other side cover plate (1293).

[0200] The other side arc passage (1283) is a space surrounded by a floor portion (121), a one-sided intermediate bulkhead (1262), a other side shield (1293), and a other side wall portion (125). In the floor portion (121) positioned below the other side shield (1293), a hole (a hole through which the arc is discharged) penetrating the floor portion (121) is not formed.

[0201] Each of the one-side arc passage (1281), the middle-side arc passage (1282), and the other-side arc passage (1283) is not formed by separate components being combined with the case (12), but is formed by a one-side cover plate (1291), a middle-side cover plate (1292), and a other-side cover plate (1293) formed integrally with the case (12).

[0202] The arc exhaust port formed in the base assembly (13) communicates with the arc passage (128) formed in the case (12).

[0203] The arc (A) generated inside the plurality of base assemblies (13) is discharged to the outside of the case (12) through the arc discharge ports of each base assembly (13a, 13b, 13c) and the one-side arc passage (1281), the middle-side arc passage (1282), and the other-side arc passage (1283) of the case (12).

[0204] In this way, the case (12) of the circuit breaker (10) according to the embodiment of the present invention has an arc shield (129) formed integrally with the case (12) to form an arc passage (128), thereby smoothly discharging the arc (A) to the outside of the circuit breaker (10) without additional parts.

[0205] In addition, the case (12) of the circuit breaker (10) of the present invention has an arc shield (129) formed integrally with the case (12), thereby preventing other components placed in the receiving space (12h) of the case (12) from being contaminated by flying debris and carbon films generated by the arc (A), thereby improving the withstand voltage performance of the circuit breaker (10).

[0206] In addition, the case (12) of the circuit breaker (10) of the present invention forms an arc passage (128) by having an arc shield (129) formed integrally with the case (12) without attaching a separate part to the case (12), thereby reducing manufacturing costs and shortening manufacturing time.

Claims

1. A case equipped with a circuit breaker for wiring, The above case accommodates the base assembly, The above case has an arc passage through which an arc generated inside the base assembly moves, A case of a wiring circuit breaker, wherein the above arc passage is formed integrally with the case.

2. In paragraph 1, A case of a wiring circuit breaker, wherein the above arc passage is formed by an arc shield formed integrally with the case.

3. In paragraph 2, The above arc shield is formed in the thickness direction of the bottom of the case at a preset distance from the bottom, The case of a wiring circuit breaker, wherein the above arc passage is a space of a preset volume formed between the bottom portion and the arc shield.

4. In paragraph 2, The above arc shield is formed in the thickness direction of the bottom of the case at a preset distance from the bottom, A case for a wiring circuit breaker, wherein the above arc shield is formed by integrally connecting one side wall portion and the other side wall portion of the case.

5. In paragraph 4, The above arc shield includes a one-sided shield, The case includes an inner bulkhead formed on one side of the case, The above one-sided cover plate is integrally connected to one side wall of the case and the one-sided inner bulkhead, A case for a wiring circuit breaker, wherein the arc passage includes a one-sided arc passage surrounded by the bottom portion of the case, the one-sided wall portion, the one-sided shield, and the one-sided inner bulkhead.

6. In paragraph 4, The above arc shield includes a middle shield, The case includes an inner wall on one side and an intermediate wall on one side formed inside the case, The above-mentioned middle side shield is integrally connected to the one-side inner bulkhead and the one-side middle bulkhead, A case of a wiring circuit breaker, wherein the arc passage includes an intermediate arc passage surrounded by the bottom portion of the case, the one-side inner partition wall, the intermediate side cover plate, and the one-side intermediate partition wall.

7. In paragraph 4, The above arc shield includes a shield on the other side, The case includes a middle partition formed on one side inside the case, The above-mentioned side cover is integrally connected to the one-side intermediate bulkhead and the other side wall of the case, A case of a wiring circuit breaker, wherein the arc passage includes an arc passage on the other side surrounded by the bottom portion of the case, the middle partition wall on one side, the cover plate on the other side, and the wall portion on the other side.

Images