Circuit breaker

Abstract

A circuit breaker belongs to the technical field of low-voltage apparatuses. Comprising an insulating shell with at least two pole spaces and a short-circuit conductor used for connecting the two poles in series, the insulating shell comprises a base and an upper cover matched with the base, a pole partition wall used for separating the two adjacent poles is formed on the base, the short-circuit conductor is installed in a groove formed in the pole partition wall, and the upper cover is arranged on the base. The electric connector is characterized in that the electric connector further comprises an insulating part, the insulating part is installed in the groove, the upper part of the insulating part is matched with the upper cover in an inserted and embedded mode, and the lower part of the insulating part penetrates into the groove and is close to the short-circuit conductor. The interphase insulating structure has the advantages that the insulating part is additionally arranged in the groove corresponding to the interpolar partition wall, the upper part of the insulating part is matched with the upper cover in an inserting and embedding manner, and the lower part of the insulating part penetrates into the groove and is close to the short-circuit conductor, so that the interphase insulating property is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of low-voltage electrical appliances, and particularly relates to a circuit breaker. Background Art

[0002] Molded case circuit breakers (MCCBs) are protective devices used in low-voltage power distribution systems. They connect and disconnect normal operating currents, and automatically and rapidly interrupt fault currents when a circuit fault occurs or when the current exceeds a set trip threshold, protecting circuits and equipment from damage caused by overloads or short circuits. In addition to the necessary casing, a MCB typically includes functional components such as an operating mechanism, a contact system, a trip unit, and an arc extinguishing system. The operating mechanism is a crucial component, disconnecting the faulty circuit when a line fault occurs. The arc extinguishing system extinguishes the arc generated when the circuit breaker trips. For AC circuit breakers, after the base and cover of the casing are installed, isolation ribs (also called "isolation ribs") on the pole-to-pole partition walls (also called "pole-to-pole partition walls") of the base cooperate with the cover to separate the gaps between adjacent arc extinguishing chambers. The insulation performance between adjacent arc extinguishing chambers generally meets industry expectations. However, for DC circuit breakers, due to the internal contact system connection, that is, the wiring method of the static contact and the moving contact, such as contact system design, safety spacing requirements and installation complexity, it is impossible to set isolation ribs on the pole partition wall of the base where the short-circuiting conductor is installed, thereby generating an assembly gap between the pole partition wall after the base and the cover are installed. This assembly gap will reduce the phase-to-phase insulation performance of the circuit breaker. Therefore, when a short-circuit fault occurs in the circuit breaker, phase-to-phase breakdown is likely to occur, damaging the circuit breaker. Utility Model Content

[0003] The task of the utility model is to provide a circuit breaker which helps to improve the interphase insulation performance by reasonably improving the structure of the pole partition wall.

[0004] The task of the present utility model is accomplished in this way. A circuit breaker includes an insulating housing having at least two pole spaces and a shorting conductor for connecting the two poles in series, the insulating housing including a base and an upper cover cooperating with the base, a pole partition wall for separating two adjacent poles from each other is formed on the base, the shorting conductor is installed in a groove formed on the pole partition wall, and is characterized in that: it also includes an insulating member, the insulating member is installed in the groove and its upper portion is mutually inserted and engaged with the upper cover, and the lower portion is deeply inserted into the groove and close to the shorting conductor.

[0005] In the present invention, the insulating member includes an insulating member main body, the lower part of which is deep in the groove and close to the short-circuit conductor; an insulating plate protruding from the electrode partition wall is formed on the side of the insulating member main body corresponding to the electrode partition wall, and an insertion groove is formed on the upper cover at a position corresponding to the insulating plate, and the upper edge of the insulating plate is plugged into and fitted with the insertion groove.

[0006] In the present invention, a first limiting portion extends from the side of the insulating plate away from the circuit breaker operating mechanism, and a second limiting portion extends toward the side of the circuit breaker operating mechanism. A first matching portion is formed on the pole partition wall at a position corresponding to the first limiting portion, and a second matching portion is formed at a position corresponding to the second limiting portion. The first limiting portion and the first matching portion correspond to each other, and the second limiting portion and the second matching portion correspond to each other. After the insulating component body is installed on the base at a position corresponding to the groove on the pole partition wall and is fitted into the groove, the pole partition wall is limited in the length direction and the width direction by the first and second limiting portions respectively cooperating with the first and second matching portions.

[0007] In the present invention, the groove is L-shaped or flat-plate-shaped.

[0008] In the present invention, the insulating member is in an L-shaped or flat plate-shaped structure corresponding to the groove.

[0009] In the present invention, the insulating member is made of a gas-generating material.

[0010] In the present utility model, the gas-generating material is plastic.

[0011] The technical effect of the technical solution provided by the utility model is that: since an insulating member is added in the groove corresponding to the pole partition wall, and the upper part of the insulating member and the upper cover are inserted into each other, and the lower part of the insulating member is deeply inserted into the groove and close to the short-circuit conductor, the phase-to-phase insulation performance is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the external observation of the insulating housing of the present invention;

[0013] Figure 2 To remove Figure 1 A schematic diagram of the components disposed in the base as viewed from behind the upper cover of the insulating housing shown;

[0014] Figure 3 A top view of the overall structure of the base;

[0015] Figure 4 for Figure 1 A schematic diagram of the bottom view of the upper cover shown;

[0016] Figure 5 To be composed of Figure 1 A schematic diagram of the electrode partition wall within the base is shown;

[0017] Figure 6 for Figure 2 and Figure 3 The structural diagram of an embodiment of the insulating member is shown. DETAILED DESCRIPTION

[0018] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the description of the embodiments does not limit the technical solution. Any changes in form rather than substance based on the concept of the present invention should be regarded as within the scope of protection of the present invention.

[0019] In the following description, all concepts related to directionality (or orientation) such as up, down, left, right, front and back are with respect to the position state of the figure being described, and are intended to facilitate public understanding. Therefore, they should not be understood as special limitations on the technical solutions provided by the present invention.

[0020] See Figures 1 to 6 , showing an insulating housing 1 with three pole spaces and a shorting conductor 2 for connecting two poles in series ( Figure 2 As shown in the figure, the aforementioned insulating housing 1 includes a base 11 and an upper cover 12 that cooperates with the base 11. A pole partition wall 112 for separating two adjacent poles from each other is formed on the base 11. A boss 116 is formed on the pole partition wall 112, and the boss 116 is inserted and cooperates with a plug-in slot 121 provided on the upper cover 12. The aforementioned short-circuit conductor 2 is installed in a groove 1121 formed on the pole partition wall 112. Since the present embodiment exemplifies a three-pole circuit breaker, there is a pair of the aforementioned pole partition walls 112 (i.e., there are two pole partition walls 112). Of course, a four-pole circuit breaker can also be used, and a four-pole circuit breaker has three pole partition walls 112. The figure also shows the arc extinguishing chamber 3, and the first arc-isolating plate 9, the second arc-isolating plate 10, and the third arc-isolating plate 20 provided at the front end of the arc extinguishing chamber 3.

[0021] The insulating member 4 of the circuit breaker structure provided by the present invention is also shown. In this embodiment, the insulating member 4 is installed in the aforementioned groove 1121, with its upper portion interlocking with the upper cover 12, and its lower portion extending deep into the groove 1121 and close to the shorting conductor 2. The "close" mentioned here can include either of the following two forms: one is that the lower portion of the insulating member 4 extends deep into the groove 1121 and maintains a slight gap between the insulating member 4 and the shorting conductor 2, such as a contact gap or a contact gap; the other is that the lower portion of the insulating member 4 extends deep into the groove 1121 and abuts the shorting conductor 2.

[0022] exist Figure 2Also shown are the insulating shaft 5, the contact system 6, the operating mechanism 7, and the partition 8. The aforementioned base 11 has a corresponding accommodating cavity 111 for each pole. Each accommodating cavity 111 is provided with a contact system 6. Each contact system 6 includes a movable contact 61 and a static contact 62 that cooperate with each other. Since this embodiment is a three-pole, more specifically a three-pole molded case circuit breaker, the aforementioned base 11 has a first pole, a second pole, and a third pole. The arrangement of the first pole, the second pole, and the third pole is as follows: Figure 1 Arranged from right to left in the figure. Since the circuit breaker of this embodiment also has three contact systems, there are also three movable contacts 61 and static contacts 62 that form contact pairs. The three static contacts 62 are fixedly mounted in the accommodating cavity 111 of the base 1 and are placed at the same end of the base 11. The three arc extinguishing chambers 3 are respectively mounted above the static contacts 62. The movable contacts 61 correspond to the static contacts 62. The three movable contacts 61 are respectively mounted on the insulating shaft 5. After installation, the movable contacts 61 are insulated from each other and can rotate within a certain range relative to the insulating shaft 5. The insulating shaft 5 is rotatably mounted on the base 11. The aforementioned first pole, second pole and third pole, that is, the adjacent two poles are separated by a pole partition wall 112 on the base 11, and a U-shaped groove 115 is provided on both pole partition walls 112. The aforementioned insulating shaft 5 is pivotally placed in the two U-shaped grooves 115, and the aforementioned partition 8 is installed in the U-shaped groove 115 and is located above the insulating shaft 5, separating the adjacent poles of the insulating shaft 5. The insulating shaft 5 can drive the moving contact 61 and the static contact 62 to connect or disconnect. When the moving contact 61 and the static contact 62 are disconnected, an arc is generated. The aforementioned arc extinguishing chamber 3 is used to extinguish the arc generated when the moving and static contacts are disconnected. The aforementioned first arc isolation plate 9, the second arc isolation plate 10 and the third arc isolation plate 20 prevent the arc generated by the disconnection from ejecting the circuit breaker.

[0023] Depend on Figure 6 As shown, the insulating member 4 includes an insulating member body 41. The lower portion of the insulating member body 41 extends deep into the groove 1121 and is close to the shorting conductor 2, or alternatively, rests against the shorting conductor 2. An insulating plate 42 is formed on the side of the insulating member body 41 corresponding to the electrode partition wall 112, protruding from the electrode partition wall 112. An insertion slot 121 is formed on the upper cover 12 at a position corresponding to the insulating plate 42. The upper edge of the insulating plate 42 engages with the insertion slot 121. As can be seen, the insulating member 4, whose upper portion engages with the upper cover 12, separates the assembly gap between adjacent poles of the circuit breaker, preventing the arc extinguishing chamber 3 of the first pole from short-circuiting with the arc extinguishing chamber 3 of the second pole during the fault current interruption process, thereby preventing damage to the circuit breaker.

[0024] Depend on Figure 3As shown, the circuit breaker of the present invention also includes two first terminals for external wiring and two second terminals for external wiring. One of the two first terminals is electrically connected to the stationary contact 62 of the first pole, while the other of the two first terminals is electrically connected to the stationary contact 62 of the third pole. One of the two second terminals is electrically connected to the movable contact 61 of the third pole, while the other of the two second terminals is electrically connected to the movable contact 61 of the second pole. Within the base 11, the stationary contact 61 of the second pole is connected in series with the adjacent movable contact 61 of the first pole via a shorting conductor 2. The aforementioned groove 1121 is formed along the length of the pole partition wall 112 between the first and second poles and corresponds to the position of the aforementioned shorting conductor 2. The shorting conductor 2 is mounted within the groove 1121.

[0025] Furthermore, as can be seen from the above description, the insulating plate 42 of the structural system of the insulating member 4 restricts the vertical movement (play) of the insulating member 4 after being assembled with the upper cover 12 .

[0026] A first limiting portion 43 extends from a side of the insulating plate 42 away from the circuit breaker operating mechanism 7, and a second limiting portion 44 extends toward the circuit breaker operating mechanism 7. A first matching portion 113 is formed on the electrode partition wall 112 at a position corresponding to the first limiting portion 43, and a second matching portion 114 is formed at a position corresponding to the second limiting portion 44. The first limiting portion 43 and the first matching portion 113 correspond to each other, and the second limiting portion 44 and the second matching portion 114 correspond to each other. After the insulating member 4 is mounted on the base 11 after being fitted with the groove 1121 at a position corresponding to the groove 1121 on the electrode partition wall 112, the first limiting portion 43 and the second limiting portion 44 cooperate with the first matching portion 113 and the second matching portion 114, respectively, to limit the length and width directions of the electrode partition wall 112.

[0027] In this embodiment, Figure 5 and Figure 6 As shown, the first limiting portion 43 and the second limiting portion 44 are respectively boss structures, and the first matching portion 113 and the second matching portion 114 are respectively groove structures corresponding to the bosses.

[0028] Furthermore, in this embodiment, the aforementioned groove 1121 is an L-shaped structure, but may also be a flat plate structure.

[0029] Furthermore, in this embodiment, the aforementioned insulating member 4 is an L-shaped structure or a flat plate structure corresponding to the groove 1121 .

[0030] In this embodiment, the insulating member 4 is a sheet-shaped insulating member made of a gas-generating material, which is plastic, such as nylon, DMC, high-temperature resistant flame-retardant paperboard or other similar insulating materials.

[0031] The applicant needs to explain that: as other optional implementation methods, the insulating part 4 involved in the technical solution provided by the present invention is not only installed in the pole partition wall 112 between the first pole and the second pole of the circuit breaker, but can also be installed in the pole partition wall 12 between the second pole and the third pole to separate the assembly gap between the pole partition wall 112 and the upper cover 12 of the circuit breaker, thereby preventing breakdown between adjacent arc extinguishing chambers 3 when the circuit breaker is disconnected, thereby improving the phase-to-phase insulation performance of the circuit breaker.

[0032] In summary, the task of the present utility model is to provide a circuit breaker, which improves the interphase insulation performance of the circuit breaker by arranging insulating members on the inter-pole partition wall of the circuit breaker.

Claims

1. A circuit breaker, comprising an insulating housing (1) having at least two pole spaces and a shorting conductor (2) for connecting the two poles in series, wherein the insulating housing (1) comprises a base (11) and an upper cover (12) matched with the base (11), a pole partition wall (112) for separating two adjacent poles from each other is formed on the base (11), and the shorting conductor (2) is installed in a groove (1121) formed on the pole partition wall (112), characterized in that: It also includes an insulating member (4), which is installed in the groove (1121) and has an upper portion that is inserted and fitted with the upper cover (12), while a lower portion is inserted deep into the groove (1121) and close to the short-circuit conductor (2).

2. A circuit breaker according to claim 1, characterized in that: The insulating member (4) includes an insulating member body (41), the lower portion of which is inserted into the groove (1121) and close to the short-circuit conductor (2); an insulating plate (42) protruding from the electrode partition wall (112) is formed on the side of the insulating member body (41) corresponding to the electrode partition wall (112); a plug-in slot (121) is formed on the upper cover (12) at a position corresponding to the insulating plate (42), and the upper edge of the insulating plate (42) is plugged into and fitted with the plug-in slot (121).

3. A circuit breaker according to claim 2, characterized in that: A first limiting portion (43) extends from a side of the insulating plate (42) away from the circuit breaker operating mechanism (7), and a second limiting portion (44) extends toward a side of the circuit breaker operating mechanism (7). A first matching portion (113) is formed on the polarity partition wall (112) at a position corresponding to the first limiting portion (43), and a second matching portion (114) is formed at a position corresponding to the second limiting portion (44). The first limiting portion (43) and the first matching portion (113) correspond to each other, and the second limiting portion (44) and the second matching portion (114) correspond to each other. After the insulating member body (41) is mounted on the base (11) by being fitted with the groove (1121) at a position corresponding to the groove (1121) on the polarity partition wall (112), the first limiting portion (43) The first and second limiting portions (44) respectively cooperate with the first matching portion (113) and the second matching portion (114) to limit the length direction and width direction of the electrode partition wall (112).

4. A circuit breaker according to claim 1, 2 or 3, characterized in that: The groove (1121) is L-shaped or flat-plate-shaped.

5. A circuit breaker according to claim 1 or 2, characterized in that: The insulating member (4) is in an L-shaped or flat plate-shaped structure corresponding to the groove (1121).

6. A circuit breaker according to claim 4, characterized in that: The insulating member (4) is made of a gas-generating material.

7. A circuit breaker according to claim 6, characterized in that: The gas-generating material is plastic.

Images