Static contact module of circuit breaker

Abstract

A static contact module of a circuit breaker belongs to the technical field of switching devices. Comprising a static contact and a magnetism increasing block assembly, one end of the static contact is provided with a static contact first end portion, the other end of the static contact is bent to form a static contact second end portion with a containing cavity, a support is fixedly arranged on the first end portion, the magnetism increasing block assembly is arranged below the static contact first end portion, and one end of the magnetism increasing block assembly is located in the containing cavity. And one end, facing the magnetism increasing block assembly, of the locking piece is clamped and matched with the other end of the magnetism increasing block assembly so as to limit the magnetism increasing block assembly, so that the magnetism increasing block assembly is fixed on the circuit breaker. The magnetic increasing block assembly has the advantages that the magnetic increasing block assembly can be quickly and conveniently installed in a contact loop, the installation reliability can be guaranteed, and the relay type circulation requirement and the installation quality requirement of the assembly process can be met.

Description

Technical Field

[0001] The utility model belongs to the technical field of switch electrical appliances, and in particular relates to a static contact module of a circuit breaker. Background Art

[0002] In order to improve the IT breaking capacity (the ability of the circuit breaker to safely cut off the fault current under certain conditions) of high-voltage DC circuit breakers with arc extinguishing, isolation and protection functions, the existing technology often sets a magnetizing block in the arc extinguishing chamber of the circuit breaker to enhance magnetic blowing, accelerate arc transfer, and improve arc extinguishing performance. In order to ensure the magnetic blowing effect, the usual practice is to set the magnetizing block behind the arc striking angle of the static contact. However, since the magnetizing block needs to occupy a certain volume space, and at the same time, in order to prevent it from affecting the current flowing through the static contact, the magnetizing block needs to be insulated and isolated from the contact circuit, which makes the installation of the magnetizing block and the contact circuit more cumbersome. Due to space limitations and insulation requirements, it is not convenient to use fasteners such as screws to position the magnetizing block, resulting in undesirable but unavoidable frequent falling off during the installation process, affecting the installation efficiency and the relay flow of the entire assembly operation. Utility Model Content

[0003] The utility model aims to provide a static contact module for a circuit breaker which helps to quickly and conveniently install a magnetizing block assembly into a contact circuit and helps to ensure the reliability of installation so as to meet the flow requirements of the assembly process and the assembly quality requirements.

[0004] The task of the utility model is accomplished in this way. A static contact module of a circuit breaker includes a static contact and a magnetizing block assembly. A static contact first end portion I is arranged at one end of the static contact, and the other end is bent to form a static contact second end portion II having a cavity. A bracket is fixedly arranged on the first end portion I. The magnetizing block assembly is arranged below the first end portion I of the static contact and one end is located in the cavity. It also includes a locking piece that is clamped on the bracket. The locking piece is clamped and matched with one end of the magnetizing block assembly toward the other end of the magnetizing block assembly to complete the limiting of the magnetizing block assembly, thereby realizing the fixation of the magnetizing assembly on the circuit breaker.

[0005] Furthermore, the magnetizing block assembly comprises a magnetizing block shell, and the magnetizing block shell and the facing ends of the locking member are snap-fitted with each other.

[0006] Furthermore, a bracket claw extends downward from the right end of the bracket, and a claw introduction cavity is formed at the middle position of the left end of the locking member, and a claw slot is formed at a position corresponding to the right side of the claw introduction cavity. The bracket claw is embedded in the claw slot from the claw introduction cavity to achieve the limiting of the locking member on the bracket.

[0007] Furthermore, a left-side limiting portion of the magnetizing block shell is extended from the left end of the upward side of the magnetizing block shell, and the left side surface of the left-side limiting portion of the magnetizing block shell abuts against the right side surface of the second end portion II of the static contact of the static contact, and a right-side limiting portion of the magnetizing block shell is extended from the right end of the left-side limiting portion of the magnetizing block shell, and the right side surface of the right-side limiting portion of the magnetizing block shell abuts against the left end surface of the locking piece, thereby realizing the limitation of the magnetizing block assembly in the length direction of the circuit breaker.

[0008] Furthermore, a limiting protrusion is provided below the limiting portion on the right side of the magnetizing block housing, and the side wall of the limiting protrusion abuts against the side wall of the claw introduction cavity of the claw introduction cavity to achieve limiting of the magnetizing block assembly in the width direction of the circuit breaker.

[0009] Furthermore, a shell claw is extended below the right limit portion of the magnetizing block shell, and the shell claw is arranged below the bracket claw and forms an upper and lower overlapping relationship with each other.

[0010] Furthermore, a connecting plate is connected to the first end portion I of the static contact corresponding to the static contact, a yoke is fixed to the left end of the connecting plate and a heat insulation plate is arranged between the left end of the connecting plate and the opposite side of the yoke, and the bracket is arranged between the bottom wall of the yoke and the upper surface of the magnetization block shell.

[0011] Furthermore, an arc-striking plate is fixedly connected to the second end portion II of the static contact, and the lower end of the arc-striking plate extends to the arc-extinguishing chamber.

[0012] Furthermore, a locking member holding step portion is formed at the right end of the connecting plate, and the bottom surface of the locking member holding step portion is in contact with the upper surface of the locking member.

[0013] The technical solution provided by the utility model facilitates to quickly and conveniently install the magnetizing block assembly into the contact circuit and helps to ensure the reliability of the installation, thereby meeting the relay flow requirements of the assembly process and the installation quality requirements, because the magnetizing block assembly is arranged in a snap-fitting manner with the locking piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a cross-sectional view of the utility model;

[0015] Figure 2 for Figure 1 The exploded structural diagram of the stationary contact, arc-starting plate, connecting plate, bracket and yoke shown;

[0016] Figure 3 for Figure 2 Schematic diagram of the assembly;

[0017] Figure 4 for Figure 1The structural diagram of the locking member shown;

[0018] Figure 5 for Figure 1 and Figure 2 A detailed structural diagram of the bracket shown;

[0019] Figure 6 for Figure 5 Schematic diagram of bottom observation;

[0020] Figure 7 for Figure 4 A schematic diagram of the locking member shown when viewed from another direction;

[0021] Figure 8 for Figure 4 and Figure 7 A schematic diagram of a locking member viewed from the bottom is shown. DETAILED DESCRIPTION

[0022] In order to more clearly understand the technical essence and beneficial effects of the present invention, the applicant provides a detailed description in the form of embodiments below. However, the description of the embodiments is not a limitation on the present invention. Any equivalent changes made based on the concept of the present invention that are merely formal and not substantial should be regarded as within the scope of the technical solution of the present invention.

[0023] In the following description, all concepts related to up, down, left, right, front and back directions or orientations are based on the current Figure 1 The position state is taken as a reference, and therefore it cannot be understood as a special limitation on the technical solution provided by the utility model.

[0024] See also Figures 1 to 8 , showing the housing 4 of the circuit breaker structure system composed of a base 41 and a cover 42 matched with the upper part of the base 41; showing the static contact 1 and the magnetizing block assembly 2 of the structure system of the static contact module arranged in the aforementioned housing 4 and corresponding to the base 41 for setting the arc extinguishing system (not shown in the figure) above the right end of the arc extinguishing chamber 411, one end of the aforementioned static contact 1 is provided with (can also be called "formed with") a static contact first end Ⅰ11, and the other end is bent to form a static contact second end Ⅱ12 with a cavity, and a bracket 14 is fixedly provided at the static contact second end Ⅰ11, and the magnetizing block assembly 2 is arranged below the static contact first end Ⅰ11 and one end is arranged in the aforementioned cavity. In this embodiment, the cavity is U-shaped, but it is not limited to this, and it can also be set to V-shaped, L-shaped, etc.

[0025] exist Figure 1 The rotating shaft 8 and the moving contact 9 are also shown.

[0026] The technical key points of the technical solution provided by the utility model include: a locking piece 3 that is clamped on the bracket 14, and the locking piece 3 is clamped and matched with the other end of the magnetizing block assembly 2 toward one end of the magnetizing block assembly 2 to complete the limiting of the magnetizing block assembly 2, thereby realizing the fixation of the magnetizing block assembly 2 on the circuit breaker.

[0027] For further information, see Figure 2 And combined with Figure 1 The aforementioned magnetizing block assembly 2 includes a magnetizing block housing 21, and the magnetizing block housing 21 and the facing end of the aforementioned locking member 3 are engaged with each other.

[0028] Furthermore, a connecting plate 13 is connected to the first end portion Ⅰ11 of the static contact corresponding to the static contact 1, a yoke 6 is fixed to the left end of the connecting plate 13, and a heat insulation plate 7 is arranged between the left end of the connecting plate 13 and the opposite side of the yoke 6, and the bracket 14 is arranged between the bottom wall of the yoke 6 and the upper surface of the magnetizing block housing 21, wherein the magnetizing block assembly 2 also includes a magnetizing block 22, and the magnetizing block housing 21 is formed with a magnetizing block embedding cavity 212 whose shape and size are adapted to the magnetizing block 22, and the magnetizing block 22 is embedded in the magnetizing block embedding cavity 215 ( Figure 2 In this embodiment, the number of the aforementioned heat insulation boards 7 is four (the heat insulation boards 7 may also be referred to as "partition boards") stacked from bottom to top for isolation and heat insulation.

[0029] Furthermore, a bracket claw 141 extends downwardly from the right end of the bracket 14, and a claw introduction cavity 31 ( Figure 7 As shown in the figure, a claw slot 32 is formed at a position corresponding to the right side of the claw introduction cavity 31, and the bracket claw 141 is inserted into the claw slot 32 from the claw introduction cavity 31 to achieve the position limitation of the locking member 3 on the bracket 14. Specifically, the upper surface of the bracket claw 141 is attached to the upper wall 321 of the claw slot 32, and the left and right side surfaces of the bracket claw 141 are attached to the side walls 322 of the claw slot 32.

[0030] Furthermore, a left-side limiting portion 212 of the magnetizing block shell extends from the left end of the upward side of the magnetizing block shell 21, and the left side surface of the left-side limiting portion 212 of the magnetizing block shell abuts against the right side surface of the second end portion Ⅱ12 of the static contact 1, and a right-side limiting portion 213 of the magnetizing block shell extends from the right end of the left-side limiting portion 212 of the magnetizing block shell, and the right side surface of the right-side limiting portion 213 of the magnetizing block shell abuts against the left end surface of the locking piece 3 to achieve the limitation of the magnetizing block assembly 2 in the length direction of the circuit breaker.

[0031] Furthermore, a limiting protrusion 214 is provided below the limiting portion 213 on the right side of the magnetizing block housing, and the side wall of the limiting protrusion 214 abuts against the side wall 311 of the claw introduction cavity 31, so as to limit the magnetizing block assembly 2 in the width direction of the circuit breaker. In this embodiment, there are two limiting protrusions 214, which are provided in the claw introduction cavity 31, and the two limiting protrusions 214 abut against the side wall 311 of the claw introduction cavity respectively.

[0032] Furthermore, the lower end face of the left limiting portion 212 of the magnetizing block shell abuts against the right side face of the second end portion Ⅱ12 of the static contact 1, the lower end face of the right limiting portion 213 of the magnetizing block shell abuts against the upper wall 312 of the claw introduction cavity, the lower end face of the limiting protrusion 214 abuts against the bottom wall 313 of the claw introduction cavity, and the upper surface of the magnetizing block shell 21 abuts against the bracket 14, thereby achieving the limitation of the magnetizing block assembly 2 in the height direction of the circuit breaker.

[0033] In actual use, especially when the second end II12 of the static contact is bent to form an L-shaped cavity, in order to prevent the magnetizing block assembly 2 from rotating counterclockwise, a shell claw 211 is extended below the right limit portion 213 of the magnetizing block housing. The shell claw 211 is arranged below the bracket claw 141, and they are overlapped with each other. That is, even if the magnetizing block assembly 2 rotates counterclockwise, the magnetizing block assembly 2 is still limited and will not slide off the locking member 3 because the shell claw 211 is abutted against the lower surface of the bracket claw 141. In this embodiment, the shell claw 211 is integrally arranged with the magnetizing assembly housing 21, and it is also feasible to be separated. Or the shell claw 211 extends from other components.

[0034] Furthermore, an arc-striking plate 121 is fixedly connected to the second end II12 of the aforementioned static contact, and the lower end of the arc-striking plate 121 extends to the aforementioned arc-extinguishing chamber 411. In this embodiment, the grid in the arc-extinguishing chamber 411 is only extended to the lower end of the arc-striking plate 121. According to actual needs, the lower end of the arc-striking plate 121 can also be bent and extended to the right side. At this time, the grid in the arc-extinguishing chamber 411 is also correspondingly extended to the lower side of the right end of the arc-striking plate 121.

[0035] Furthermore, a locking member holding step portion 131 is formed at the right end of the aforementioned connecting plate 13 , and the bottom surface of the locking member holding step portion 131 is in contact with the upper surface of the aforementioned locking member 3 .

[0036] Furthermore, a pair of nut cavities 33 (or one nut) for setting nuts are provided on the aforementioned locking member 3, and a bolt hole 331 penetrating the thickness direction of the locking member 3 is provided at the central position of the nut cavity 33, and the locking member 3 is fixed to the outgoing line row 5 of the circuit breaker by bolts at positions corresponding to the bolt holes 331. Figure 1 , the inlet row 10 is shown; in this embodiment, the aforementioned locking member 3 is a plastic locking member, that is, it is molded by plastic.

[0037] Furthermore, the aforementioned magnetizing block housing 21 of the present invention is made of insulating material; the aforementioned insulating material is plastic.

[0038] Furthermore, the longitudinal cross-section of the magnetizing block embedding cavity 212 and the magnetizing block 22 is a trapezoid.

[0039] Figure 2 The rivet holes 132 shown in the figure and opened on the connecting plate 13 are used for riveting the bimetallic elements not shown in the figure.

[0040] It should be noted that it is also feasible not to provide the magnetizing block 22 in the magnetizing assembly housing 21 , that is, the magnetizing assembly housing 21 plays the role of isolating the electric arc.

[0041] Since the working mechanism of the static contact module of the circuit breaker belongs to the conventional technical scope of this field, the applicant will not elaborate on it.

[0042] In summary, the technical solution provided by the utility model makes up for the shortcomings of the existing technology, successfully completes the invention task, and faithfully realizes the technical effects stated by the applicant in the technical effect column above.

Claims

1. A static contact module for a circuit breaker, comprising a static contact (1) and a magnetizing block assembly (2), wherein one end of the static contact (1) is provided with a static contact first end portion I (11), and the other end is bent to form a static contact second end portion II (12) having a cavity, a bracket (14) is fixedly provided on the first end portion I (11), the magnetizing block assembly (2) is provided below the static contact first end portion I (11) and one end is located in the cavity, and the characteristics are: The invention also comprises a locking member (3) which is clamped on the bracket (14); one end of the locking member (3) faces the magnetizing block assembly (2) and is clamped with the other end of the magnetizing block assembly (2) to limit the position of the magnetizing block assembly (2), thereby fixing the magnetizing block assembly (2) on the circuit breaker.

2. The static contact module of a circuit breaker according to claim 1, characterized in that: The magnetizing block assembly (2) comprises a magnetizing block housing (21), and the magnetizing block housing (21) and the facing ends of the locking member (3) are engaged with each other in a clamping manner.

3. The static contact module of a circuit breaker according to claim 2, characterized in that: A bracket claw (141) extends downward from the right end of the bracket (14), and a claw introduction cavity (31) is formed in the middle of the left end of the locking member (3), and a claw clamping groove (32) is formed at a position corresponding to the right side of the claw introduction cavity (31). The bracket claw (141) is inserted into the claw clamping groove (32) from the claw introduction cavity (31), so as to limit the locking member (3) on the bracket (14).

4. The static contact module of a circuit breaker according to claim 3, characterized in that: A left-side limiting portion (212) of the magnetizing block shell extends from the left end of the upward side of the magnetizing block shell (21), and the left side surface of the left-side limiting portion (212) of the magnetizing block shell abuts against the right side surface of the second end portion II (12) of the static contact (1), while a right-side limiting portion (213) of the magnetizing block shell extends from the right end of the left-side limiting portion (212) of the magnetizing block shell, and the right side surface of the right-side limiting portion (213) of the magnetizing block shell abuts against the left end surface of the locking member (3), thereby achieving the limitation of the magnetizing block assembly (2) in the length direction of the circuit breaker.

5. The static contact module of a circuit breaker according to claim 4, characterized in that: A limiting protrusion (214) is provided below the limiting portion (213) on the right side of the magnetizing block housing, and the side wall of the limiting protrusion (214) abuts against the side wall (311) of the claw introduction cavity (31) to achieve limiting of the magnetizing block assembly (2) in the width direction of the circuit breaker.

6. The static contact module of a circuit breaker according to claim 5, characterized in that: A shell claw (211) is extended below the right limit portion (213) of the magnetizing block shell. The shell claw (211) is arranged below the bracket claw (141) and forms an upper and lower overlapping relationship with each other.

7. The static contact module of a circuit breaker according to claim 2, characterized in that: A connecting plate (13) is connected to the first end portion I (11) of the stationary contact corresponding to the stationary contact (1), a yoke (6) is fixed to the left end of the connecting plate (13), and a heat insulating plate (7) is arranged between the left end of the connecting plate (13) and the opposite side of the yoke (6), and the bracket (14) is arranged between the bottom wall of the yoke (6) and the upper surface of the magnetizing block shell (21).

8. The static contact module of a circuit breaker according to claim 1, characterized in that: An arc-striking plate (121) is fixedly connected to the second end portion II (12) of the stationary contact, and the lower end of the arc-striking plate (121) extends to the arc-extinguishing chamber (411).

9. The static contact module of a circuit breaker according to claim 7, characterized in that: A locking member holding step portion (131) is formed at the right end of the connecting plate (13), and the bottom surface of the locking member holding step portion (131) is in contact with the upper surface of the locking member (3).

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