A circuit breaker auxiliary device with good pressure resistance

Abstract

The application discloses a circuit breaker auxiliary device with good pressure resistance, which comprises a first shell, a moving contact mechanism rotatably arranged on the first shell through a first rotating shaft, an auxiliary contact, a first moving contact and an indicating piece, wherein the first moving contact is respectively abutted with a first conductive plate or a second conductive plate; a separate excitation contact mechanism rotatably arranged on the first shell through a second rotating shaft, a second moving contact, a static contact piece inserted into the first shell and a reset torsional spring sleeved on the second rotating shaft; and an operating handle rotatably arranged on the upper portion of the first shell, wherein the operating handle comprises a handle, a rotating portion, a connecting portion and a convex portion matched with the second moving contact. The circuit breaker auxiliary device works together with the separate excitation contact mechanism and the moving contact mechanism, effectively increases the electrical gap between the moving contact and the static contact, thereby improving the overall pressure resistance to more than 1500V, and the segmentation effect is better and more reliable.

Description

Technical Field

[0001] This invention relates to the field of electrical accessories technology, and more specifically to a circuit breaker auxiliary device with good withstand voltage performance. Background Technology

[0002] Electrical accessories are the most common type of electrical device in circuit breaker auxiliary units. They are generally divided into auxiliary electrical accessories and alarm electrical accessories. Auxiliary electrical accessories control the three states of the circuit breaker—open, closed, and tripping—by switching the contacts on and off. Alarm electrical accessories issue an alarm signal when a fault trips.

[0003] like Figure 6 As shown, existing circuit breaker auxiliary devices suffer from a small electrical clearance between the moving and stationary contacts and rely on microswitches for tripping alarms. This limits the overall withstand voltage of the auxiliary device to a maximum of 1200V. Furthermore, if the DC current flowing through the circuit breaker auxiliary device exceeds 60V, the microswitch will fail to disconnect properly, posing a safety hazard and causing considerable inconvenience. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the aforementioned problems, this invention proposes a circuit breaker auxiliary device with a simple structure, strong pressure resistance, and good tripping performance.

[0006] (II) Technical Solution

[0007] An auxiliary device for a circuit breaker with good withstand voltage performance according to the present invention includes: a first housing, on which a first rotating shaft, a second rotating shaft, and at least two grooves are inserted; a limiting wall is also provided on the first housing; a first conductive plate and a second conductive plate are respectively inserted into the grooves; a moving contact mechanism, rotatably mounted on the first housing via the first rotating shaft, including an auxiliary contact, a first moving contact, and an indicator, wherein the first moving contact abuts against the first conductive plate or the second conductive plate; a shunt trip contact mechanism, rotatably mounted on the first housing via the second rotating shaft, including a second moving contact, a stationary contact piece inserted into the first housing, and a return torsion spring fitted on the second rotating shaft; and an operating handle, rotatably mounted on the upper part of the first housing, wherein the operating handle includes a handle, a rotating part, a connecting part, and a protrusion that cooperates with the second moving contact.

[0008] In this invention, the first moving contact is disposed between the first conductive plate and the second conductive plate.

[0009] In this invention, the connecting part is provided with a connecting hole, and the connecting part is fitted with a connecting rod through the connecting hole, and the other end of the connecting rod is connected to the moving contact mechanism.

[0010] In this invention, the connecting part is disposed on the side of the rotating part near the moving contact.

[0011] In this invention, the second moving contact includes a moving contact piece and an integrally bent stationary contact piece. The moving contact piece is provided with an insertion hole and a rotating groove that cooperates with the second rotating shaft. One end of the reset torsion spring is connected to the insertion hole, and the other end abuts against the limiting wall.

[0012] In this invention, the top of the movable contact piece is provided with an integrally bent limiting surface, and the movable contact piece extends outward from one end of the limiting surface.

[0013] In this invention, the stationary contact piece is disposed above the limiting wall.

[0014] In this invention, the protrusion is disposed on the side of the rotating part near the second moving contact.

[0015] In this invention, stepped terminals are provided on both sides of the first housing, a shunt trip unit is provided inside the first housing, and the limiting wall is located above the shunt trip unit.

[0016] (III) Beneficial Effects

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] (1) The circuit breaker auxiliary device in this invention works together with the shunt contact mechanism and the moving contact mechanism, which effectively increases the electrical clearance between the moving contact and the stationary contact, thereby improving the overall withstand voltage performance to more than 1500V, and the segmentation effect is better and very reliable. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the internal structure of the circuit breaker auxiliary device in Example 1;

[0021] Figure 2 This is a schematic diagram of the internal structure of the circuit breaker auxiliary device in Example 1 (omitting the shunt contact mechanism);

[0022] Figure 3 This is a schematic diagram of the overall structure of the circuit breaker auxiliary device in Example 1;

[0023] Figure 4This is a three-dimensional structural diagram of the second moving contact in Example 1;

[0024] Figure 5 This is a three-dimensional structural diagram of the operating handle in Example 1;

[0025] Figure 6 This is a schematic diagram of the internal structure of a circuit breaker auxiliary device in the prior art.

[0026] 100. First housing; 101. Groove; 102. First rotating shaft; 103. Second rotating shaft; 104. First conductive plate; 105. Second conductive plate; 106. Limiting wall; 107. Shunt trip unit.

[0027] 200. Moving contact mechanism; 201. First moving contact; 202. Auxiliary contact; 203. Indicator.

[0028] 300. Shunt contact mechanism; 302. Second moving contact; 3021. Moving contact piece; 3022. Connecting piece; 3023. Insertion hole; 3024. Rotating groove; 303. Return torsion spring; 304. Limiting surface; 305. Stationary contact piece.

[0029] 400. Operating handle; 401. Handle; 402. Rotating part; 403. Connecting part; 4031. Connecting hole; 404. Protrusion.

[0030] 500, Second outer shell. Detailed Implementation

[0031] Compared to the embodiments shown in the accompanying drawings, feasible embodiments within the scope of this disclosure may have fewer components, other components not shown in the drawings, different components, components arranged differently, or components with different connections, etc. Furthermore, two or more components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0032] Unless otherwise defined, the technical or scientific terms used herein should be understood in their ordinary sense by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, “an” or “a” and similar terms do not necessarily indicate a quantity limitation. Terms such as “comprising,” “including,” or “having” mean that the element or object preceding the word encompasses the element or object listed following the word and its equivalents, without excluding other elements or objects. Terms such as “connected” or “connected” are not limited to the physical or mechanical connection or connection shown in the drawings, but can include equivalent connections or connections, whether direct or indirect. Terms such as “upper,” “lower,” “left,” “right,” “horizontal,” and “vertical” are used only to indicate relative positional relationships, which may change accordingly when the absolute position of the described object changes.

[0033] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Example 1

[0035] Reference Figures 1-5 This application describes a circuit breaker auxiliary device with good withstand voltage performance according to an embodiment of the present application.

[0036] The circuit breaker auxiliary device includes a first housing 100 and a second housing 500 fitted with the first housing 100. The first housing 100 is provided with a moving contact mechanism 200 and a shunt contact mechanism 300. The moving contact mechanism 200 is rotatably fitted by a first rotating shaft 102 inserted into the first housing 100. The moving contact mechanism 200 includes a first moving contact 201, an auxiliary contact 202, and an indicator 203.

[0037] The indicator 203 is rotatably mounted on the first housing 100 and moves with the movement of the moving contact mechanism 200. The first housing 100 is also provided with a first conductive plate 104, a second conductive plate 105, and two grooves 101 for accommodating the first conductive plate 104 and the second conductive plate 105. The grooves 101 are an upwardly protruding annular convex wall structure, that is, there are grooves 101 recessed downward at the center of the convex wall for accommodating the first conductive plate 104 or the second conductive plate 105 respectively.

[0038] The first moving contact 201 abuts against either the first conductive plate 104 or the second conductive plate 105, meaning that within the rotation range of the moving contact mechanism 200, the first moving contact 201 is positioned between the first conductive plate 104 and the second conductive plate 105. When the circuit breaker auxiliary device is in the closed state, the front end of the first moving contact 201 abuts against the first conductive plate 104; when in the open state, the back end of the first moving contact 201 abuts against the second conductive plate 105.

[0039] An operating handle 400 is rotatably mounted on the upper part of the first housing 100. The operating handle 400 includes a handle 401 extending outward from the first housing 100, a rotating part 402, a connecting part 403 located on the lower right side of the rotating part 402, and a protrusion 404 located on the lower left side of the rotating part 402 for cooperating with the shunt contact mechanism 300.

[0040] The connecting part 403 is provided with a connecting hole 4031 for connecting the operating handle 400 and the connecting rod (not shown in the figure) of the auxiliary contact 202, thereby realizing the linkage between the operating handle 400 and the moving contact mechanism 200. It should be noted that realizing the linkage between the moving contact and the operating handle 400 through the connecting rod is a common method in the prior art, so the working principle will not be described in detail here.

[0041] The shunt contact mechanism 300 is rotatably mounted via a second rotating shaft 103 inserted into the first housing 100. The shunt contact mechanism 300 includes a second moving contact 302 fitted with the second rotating shaft 103, a stationary contact piece 305, and a reset torsion spring 303 fitted with the second rotating shaft 103.

[0042] Preferably, the stationary contact 305 is inserted above the limiting wall 106 and to the lower left of the second moving contact 302.

[0043] The second moving contact 302 includes a connecting piece 3022 and a moving contact piece 3021 integrally bent and extending to the left. The connecting piece 3022 is provided with an insertion hole 3023 for connecting the reset torsion spring 303 and a round hole. Below the moving contact, the first housing 100 is also provided with a limiting wall 106 for abutting the reset torsion spring 303. One end of the reset torsion spring 303 is inserted into the insertion hole 3023 and the other end abuts against the limiting wall 106.

[0044] A rotating groove 3024 is provided between the slot and the round hole, and the connecting piece 3022 is fitted with the second rotating shaft 103 through the rotating groove 3024, that is, the second moving contact 302 is rotatably fitted with the second rotating shaft 103 through the rotating groove 3024.

[0045] The top of the connecting piece 3022 is provided with an integrally bent limiting surface 304, and the moving contact piece 3021 extends from the left end of the limiting surface 304 to the lower left and is located above the stationary contact piece 305.

[0046] When the operating handle 400 is closed, the operating handle 400 rotates counterclockwise, and the protrusion 404 also rotates counterclockwise and abuts against the limiting surface 304. When in the closed state, the moving contact 3021 abuts against the protrusion 404 and rotates counterclockwise to abut against the stationary contact 305. At this time, the reset torsion spring 303 is in the energy storage state.

[0047] When the circuit breaker auxiliary device trips or opens, the operating handle 400 rotates clockwise to reset, and the second moving contact 302 returns to its initial position under the action of the reset torsion spring 303. This achieves the goal of driving and controlling two moving contacts with a single operating handle 400. Therefore, the operating handle 400 can be positioned above the moving contact mechanism 200 and the shunt trip contact mechanism 300. It should be noted that the reset of the moving contact mechanism 200 is achieved through a tension spring (not shown in the figure), a common technique in existing technology, and its working principle will not be described here.

[0048] The first housing 100 is also provided with a shunt trip unit 107, and a limiting wall 106 is disposed above the shunt trip unit 107. Four stepped terminals are also provided on the left and right sides of the first housing 100.

[0049] The shunt trip unit 107 extends two wires, one of which is soldered to the stationary contact 305, and the other is soldered to the terminal block. The first conductive plate 104 is connected to a conductive terminal via a wire, and the second conductive plate 105 is connected to another conductive terminal via a wire. That is, the first conductive plate 104 and the second conductive plate 105 are respectively connected to different conductive terminals.

[0050] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the inventive concept should fall within the protection scope of the present invention. All technical contents for which protection is sought in this invention are fully described in the claims.

Claims

1. A circuit breaker auxiliary device with good withstand voltage performance, Its features are, include: A first outer shell (100) is provided with a first rotating shaft (102), a second rotating shaft (103) and at least two grooves (101). A limiting wall (106) is also provided on the first outer shell (100). A first conductive plate (104) and a second conductive plate (105) are respectively inserted into the grooves (101). The movable contact mechanism (200) is rotatably mounted on the first housing (100) via the first rotating shaft (102), and includes an auxiliary contact (202), a first movable contact (201) and an indicator (203), wherein the first movable contact (201) abuts against the first conductive plate (104) or the second conductive plate (105) respectively. The shunt contact mechanism (300) is rotatably mounted on the first housing (100) via the second rotating shaft (103), and includes a second moving contact (302), a stationary contact piece inserted into the first housing (100), and a reset torsion spring (303) mounted on the second rotating shaft (103). An operating handle (400) is rotatably mounted on the upper part of the first housing (100), and the operating handle (400) includes a handle (401), a rotating part (402), a connecting part (403), and a protrusion (404) that cooperates with the second moving contact (302); The connecting part (403) is provided with a connecting hole (4031), and a connecting rod is fitted on the connecting part (403) through the connecting hole (4031). The other end of the connecting rod is connected to the moving contact mechanism (200). The connecting part (403) is disposed on the side of the rotating part (402) near the moving contact; The second moving contact (302) includes a moving contact piece (3021) and an integrally bent stationary contact piece. The moving contact piece (3021) is provided with a socket (3023) and a rotating groove (3024) that cooperates with the second rotating shaft (103). One end of the reset torsion spring (303) is connected to the socket (3023), and the other end abuts against the limiting wall (106). The stationary contact piece is positioned above the limiting wall (106).

2. The circuit breaker auxiliary device with good withstand voltage performance according to claim 1, characterized in that, The first moving contact (201) is disposed between the first conductive plate (104) and the second conductive plate (105).

3. The circuit breaker auxiliary device with good withstand voltage performance according to claim 1, characterized in that, The top of the movable contact piece (3021) is provided with an integrally bent limiting surface (304), and the movable contact piece (3021) extends outward from one end of the limiting surface (304).

4. The circuit breaker auxiliary device with good withstand voltage performance according to claim 1, characterized in that, The protrusion (404) is disposed on the side of the rotating part (402) near the second moving contact (302).

5. The circuit breaker auxiliary device with good withstand voltage performance according to claim 1, characterized in that, The first housing (100) is provided with stepped wiring terminals on both sides, and a shunt trip unit (107) is provided inside the first housing (100). The limiting wall (106) is located above the shunt trip unit (107).

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