A high current arc extinguishing device

Abstract

The present invention discloses a high-current arc extinguishing device, comprising a housing, in which an operating component, a main contact component, and an arc contact component are disposed. The operating component comprises a spring energy storage mechanism, the input end of which is respectively connected to an electric operating mechanism and a manual operating mechanism, and the output end is respectively connected to a closing electromagnet, an opening electromagnet, and an output shaft. The output shaft is welded with multiple crank arms in parallel, each of which is respectively connected to the main contact component and the arc contact component. The main contact component comprises an outgoing busbar, a moving main contact assembly mounted on the outgoing busbar, and a stationary main contact busbar disposed opposite the outgoing busbar and adjacent to the moving main contact assembly. The arc contact component comprises a moving arc contact assembly and a stationary arc contact disposed opposite the moving arc contact assembly. The present invention has the characteristics of low temperature rise, small size, high protection level, large connection and disconnection capacity, and easy operation and maintenance. It can make the transverse electric device simple and reliable to operate, smaller in size, and longer in service life.

Description

Technical Field

[0001] The present invention relates to the technical field of DC switching electrical appliances, and more particularly to a high-current arc extinguishing device, which is particularly suitable for connecting and disconnecting high-current in a main circuit of a non-ferrous metal electrolysis cell. Background Art

[0002] The existing non-ferrous metal smelting industries for copper, aluminum, nickel, lead, and manganese primarily utilize low-voltage, high-current DC electrolysis or electrowinning processes. Typically, when the main electrolysis circuit current exceeds 20kA, the high energy load necessitates the use of a faster opening / closing electric cross-current device to quickly and safely short-circuit the electrolytic cell and complete the unloading operation.

[0003] Currently, the electric cross-current devices used in domestic nonferrous metal electrolysis primarily utilize a parallel combination of a main switch and an arc extinguishing device. This involves controlling the operating sequence to ensure the main switch can carry the rated high current for extended periods of time, while the arc extinguishing device connects and disconnects the load, preventing burnout of the main switch contacts. The arc extinguishing device plays a key role in the reliability and service life of the entire cross-current device.

[0004] Existing arc extinguishing devices mainly use a permanent magnet mechanism to drive multi-stage contacts, and have a low protection level. There are many problems during use: the inside of the switch is easily corroded by on-site acidic gases and liquids, which increases the contact resistance and reduces the insulation performance; the switch is large in size and weight, resulting in a larger installation space for the transverse power device; the control circuit is complex and there is no emergency manual operation function, and the switch cannot be operated when the control power is disconnected. Summary of the Invention

[0005] In order to overcome the shortcomings of the above-mentioned prior art, the present invention provides a large current arc extinguishing device, which has the characteristics of low temperature rise, small size, high protection level, large connection and disconnection capacity, and easy operation and maintenance. It can make the transverse electric device simple and reliable to operate, smaller in size, and longer in service life.

[0006] The present invention is achieved according to the following technical solutions:

[0007] A high-current arc extinguishing device comprises a housing, in which an operating component, a main contact component and an arc contact component are arranged; the operating component comprises a spring energy storage mechanism, the input end of the spring energy storage mechanism is respectively connected to an electric operating mechanism and a manual operating mechanism, and the output end is respectively connected to a closing electromagnet, an opening electromagnet and an output rotating shaft, a plurality of crank arms are welded in parallel on the output rotating shaft, and the plurality of crank arms are respectively connected to the main contact component and the arc contact component; the main contact component comprises an outgoing busbar, a moving main contact assembly mounted on the outgoing busbar, and a static main contact busbar arranged opposite to the outgoing busbar and close to the moving main contact assembly; the arc contact component comprises a moving arc contact assembly and a static arc contact arranged opposite to the moving arc contact assembly.

[0008] Furthermore, the shell includes a main frame, a cover plate and a protective cover arranged on the main frame, and a sealing strip is provided at the position where the main frame contacts the cover plate and the protective cover.

[0009] Furthermore, the cover plate includes a group of busbar cover plates arranged opposite to each other, and pressure relief sealing strips are provided on the busbar cover plates at positions in contact with the busbars.

[0010] Furthermore, the moving main contact assembly includes a main contact frame, one end of which is connected to the movable end of the rotating frame, and the other end is provided with multiple contact fingers; the fixed end of the rotating frame is provided on a copper block, and the copper block is provided on the inner end surface of the outgoing busbar.

[0011] Furthermore, the contact fingers are connected in series and mounted in parallel on the main contact frame via a rotating shaft, and each contact finger is equipped with a contact finger spring, and the end of each contact finger is welded to the copper block via a copper braid.

[0012] Furthermore, contact sheets are welded to the contact finger contacts and the static main contact busbar respectively.

[0013] Furthermore, the moving main contact assembly is further provided with a connecting rod, and the connecting rod is connected to a crank arm through a pin shaft.

[0014] Furthermore, the moving arc contact assembly includes a fixed seat, a rotatable arc contact frame is installed on the fixed seat, a rotating block is provided on the arc contact frame, a transfer copper plate is provided on one side of the rotating block, an arc contact spring is provided above the transfer copper plate, a moving arc contact is provided below the transfer copper plate, and a static arc contact is provided at a position opposite to the moving arc contact.

[0015] Furthermore, a limiting nut is provided on the upper portion of the arc contact spring, and a limiting bolt is provided below the adapter copper plate.

[0016] Furthermore, the moving arc contact assembly is further provided with a soft connection, and the soft connection is connected to the outgoing busbar through a straight copper plate; the static main contact busbar and the static arc contact are connected through a bent copper plate.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) The main frame of the shell of the present invention is welded as a whole with stainless steel plates, and is sealed and assembled with side covers and protective covers on all sides. It has high structural strength, small size and high protection level. Pressure relief sealing strips are installed between the busbar covers on both sides and the outgoing busbar and the static main contact busbar. When the switch disconnects the load, the internal air pressure can be released in time, thereby improving the connection and disconnection capabilities of the arc extinguishing device.

[0019] (2) The spring energy storage mechanism of the present invention has electric operation and manual operation functions, which can simplify the control circuit and has an emergency manual operation function; the multiple crank arms welded in parallel on the output shaft can respectively drive multiple groups of moving main contact assemblies, moving arc contact assemblies and auxiliary switches through connecting rods and pin shafts, which can reduce the volume of the operating components and improve the synchronization of the actions of multiple groups of contacts.

[0020] (3) The movable main contact assembly of the present invention comprises a plurality of contact fingers and contact springs connected in series via a rotating shaft and mounted side by side on a main contact frame. Distributing more contact points within a limited space can increase the contact area and reliability of the main contacts, and improve the short-term withstand current of the main contacts.

[0021] (4) The arc contact frame of the present invention can be mounted on a fixed seat and rotated by an arc pin. The moving arc contact is mounted on a rotating block and rotates at a certain angle relative to the arc contact frame. At the same time, the height of the static arc contact is greater than that of the static main contact. The main contact piece is made of a low-resistance material, while the arc contact piece is made of a high-melting-point material. This can achieve an action sequence in which the arc contact component closes first and then opens relative to the main contact component, effectively avoiding the loss of the main contact (contact finger contact) while taking into account the characteristics of strong connection and disconnection load capacity and low contact temperature rise.

[0022] (5) A limit nut is provided on the upper part of the arc contact spring of the present invention, and a limit bolt is provided under the transfer copper plate, so as to facilitate the adjustment of the contact opening distance and contact pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the overall appearance of a high-current arc extinguishing device according to an embodiment of the present invention.

[0024] Figure 2 Schematic diagram of the installation of an operating component, a main contact component and an arcing contact component according to an embodiment of the present invention.

[0025] Figure 3 Schematic diagram of the structure of a moving arc contact assembly according to an embodiment of the present invention.

[0026] Figure 4 Schematic diagram of the structure of a moving main contact assembly according to an embodiment of the present invention.

[0027] In the figure: 1-main frame; 2-protective cover; 3-sealing strip; 4-side cover; 5-pressure relief sealing strip; 6-busbar cover; 7-static main contact busbar; 8-bent copper plate; 9-static arc contact; 10-moving arc contact assembly; 10.1-fixed seat; 10.2-flexible connection; 10.3-insulating connecting rod; 10.4-rotating block; 10.5-limiting nut; 10.6-arc contact spring; 10.7-transfer copper plate; 10.8-moving arc contact; 10.9-limiting bolt; 10.10- Arc contact frame; 10.11-Arc pin shaft; 11-Moving main contact assembly; 11.1-Rotary frame; 11.2-Connecting rod; 11.3-Main contact frame; 11.4-Contact finger spring; 11.5-Contact finger; 11.6-Rotary shaft; 11.7-Copper braid; 11.8-Copper block; 12-Closing electromagnet; 13-Opening electromagnet; 14-Manual operating mechanism; 15-Electric operating mechanism; 16-Spring energy storage mechanism; 17-Output rotating shaft; 18-Crank arm; 19-Straight copper plate; 20-Outgoing busbar. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions of various embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0030] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections, or mutual communication; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0031] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0032] like Figures 1 to 4 As shown, the present invention provides a large current arc extinguishing device, which is mainly composed of a shell and an operating component, a main contact component and an arc contact component arranged in the shell.

[0033] The housing comprises a main frame, a cover plate, and a protective cover mounted on the main frame. The main frame 1 is welded from high-quality stainless steel plates and is surrounded by side covers 4, a busbar cover 6, and sealing strips 3. Pressure relief sealing strips 5 are installed between the busbar cover 6, the outgoing busbar 20, and the static main contact busbar 7. The pressure relief sealing strips 5 are normally in close contact with the busbars. When the internal pressure of the switch exceeds a certain value, they open to release pressure.

[0034] The operating components are installed on the upper part of the main frame 1 and are sealed by a protective cover 2 on the outside.

[0035] The operating components include a spring energy storage mechanism 16, an electric operating mechanism 15, a closing electromagnet 12, an opening electromagnet 13, a manual operating mechanism 14, and an auxiliary switch. The electric operating mechanism 15 and the manual operating mechanism 14 are mounted on the sides of the spring energy storage mechanism 16, while the closing electromagnet 12 and the opening electromagnet 13 are mounted on top of the spring energy storage mechanism 16. The electric operating mechanism 15 charges the spring mechanism 16 with energy, either through motor rotation or manual operation. When energized, the closing electromagnet 12 and the opening electromagnet 13 quickly drive the spring energy storage mechanism 16 to close or open the circuit breaker. The spring energy storage mechanism 16 is also equipped with manual closing and opening buttons for emergency operation.

[0036] The output shaft 17 of the spring energy storage mechanism 16 is welded with multiple crank arms 18 in parallel, which can be connected through connecting rods and pins respectively to simultaneously drive multiple groups of moving main contact assemblies 11, moving arc contact assemblies 10, and auxiliary switches to operate.

[0037] The main contact components are installed on one side of the main frame 1 through isolation of insulating plates. The main contact components include an outgoing busbar 20 installed on one side of the main frame 1, a moving main contact assembly 11 and a stationary main contact busbar 7 installed on the opposite side of the outgoing busbar 20.

[0038] The moving main contact assembly 11 consists of a main contact frame 11.3, contact fingers 11.5, contact springs 11.4, copper braids 11.7, copper blocks 11.8, connecting rods 11.2, and a rotating frame 11.1. Multiple contact fingers 11.5 and contact springs 11.4 are connected in series via a rotating shaft 11.6 and mounted side by side on the main contact frame 11.3. Each contact finger 11.5 is individually equipped with a contact spring 11.4. The contact fingers 11.5 are welded to the copper block 11.8 via copper braids 11.7. The copper block 11.8 is crimped and bolted to the inner end face of the outgoing busbar 20. Contact pieces made of low-resistance material are welded to the contact fingers 11.5 and the stationary main contact busbar 7.

[0039] The rotating frame 11.1 is fixed to the side of the copper block 11.8, and the connecting rod 11.2 is connected to one of the crank arms 18 of the output shaft 17 through a pin, so that the main contact frame 11.3 can rotate a certain angle on the rotating frame 11.1.

[0040] The arc contact component is isolated and installed on the other side of the main frame 1 through an insulating plate. The arc contact component includes a moving arc contact assembly 10 installed on the other side of the main frame and a static arc contact 9 installed on the opposite side of the moving arc contact assembly 10.

[0041] The moving arc contact assembly 10 comprises a fixed base 10.1, an arc contact frame 10.10, a flexible connector 10.2, a rotating block 10.4, a copper adapter plate 10.7, a pin 10.11, an arc contact spring 10.6, a moving arc contact 10.8, and an insulating connecting rod 10.3. The copper adapter plate 10.7 and the flexible connector 10.2 are bolted to the rotating block 10.4. The moving arc contact 10.8 is bolted to the bottom of the copper adapter plate 10.7. The arc contact spring 10.6 is mounted above the copper adapter plate 10.7. The arc contact frame 10.10 is mounted to the fixed base 10.1 via a pin 10.11 and can rotate to a certain angle. The rotating block 10.4 is mounted to the arc contact frame 10.10 via a pin and can rotate to a certain angle relative to the arc contact frame 10.10.

[0042] A limit nut 10.5 is installed above the arc contact spring 10.6, and a limit bolt 10.9 is installed below the adapter copper plate 10.7. This allows for easy adjustment of the arc contact pressure and the initial angle of the rotating block 10.4. Contact pieces made of high-melting-point material are welded to the moving arc contact 10.8 and the static arc contact 9.

[0043] As described above, the outgoing busbar 20 and the flexible connection 10.2 are connected via the straight copper plate 19, and the static main contact plate 7 and the static arc contact 9 are connected via the bent copper plate 8, so that the main contact component and the arc contact component form a parallel relationship.

[0044] The height of the static arcing contact 9 is greater than that of the static main contact busbar 7, and the moving arcing contact 10.8 has a larger rotation angle than the finger contact 11.5, which can realize the action timing of the arcing contact component closing first and then opening relative to the main contact component.

[0045] When the arc extinguishing device is closed, the electric operating mechanism drives the spring energy storage mechanism 16 to complete energy storage. After the closing electromagnet 12 is energized, it can quickly drive the output shaft 17 inside the spring energy storage mechanism 16 to rotate a certain angle. The output shaft 17 simultaneously drives the connecting rod 11.2 and the insulating connecting rod 10.3 through the crank arm 18, so that the moving main contact assembly 11 and the moving arc contact assembly 10 are closed toward the static main contact busbar 7 and the static arc contact 9 respectively. The contact finger contact 11.5 and the moving arc contact 10.8 compress the contact finger spring 11.4 and the arc contact spring 10.6 respectively to complete the closing action; when the arc extinguishing device is opened, the opening electromagnet 13 can quickly drive the output shaft 17 of the spring energy storage mechanism 16 to reset after being energized. At this time, the contact finger spring 11.4 and the arc contact spring 10.6 also quickly reset, driving the moving main contact assembly 11 and the moving arc contact assembly 10 to quickly reset, completing the opening action.

[0046] The high-current arc extinguishing device of the present invention features low temperature rise, compact size, high protection level, large making and breaking capacity, and easy operation and maintenance. This device can increase the number of main and arcing contact poles as the rated current increases, while also increasing the output torque and number of levers in the spring energy storage mechanism, making it very convenient for series expansion design.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the technical solutions of the embodiments of the present invention.

Claims

1. A high current arc extinguishing device, comprising a housing, characterized in that: The shell includes a main frame and a cover plate and a protective cover arranged on the main frame, and a sealing strip is provided at the position where the main frame contacts the cover plate and the protective cover; an operating component, a main contact component and an arc contact component are arranged in the shell; the operating component includes a spring energy storage mechanism, the input end of the spring energy storage mechanism is respectively connected to the electric operating mechanism and the manual operating mechanism, and the output end is respectively connected to the closing electromagnet, the opening electromagnet and the output shaft, and a plurality of crank arms are welded in parallel on the output shaft, and the plurality of crank arms are respectively connected to the main contact component and the arc contact component; the main contact component includes an outgoing busbar, A moving main contact assembly installed on the outgoing busbar, and a static main contact busbar arranged opposite to the outgoing busbar and close to the moving main contact assembly; the arc contact component includes a moving arc contact assembly, and a static arc contact arranged opposite to the moving arc contact assembly; the moving arc contact assembly includes a fixed seat, a rotatable arc contact frame is installed on the fixed seat, a rotating block is provided on the arc contact frame, a transfer copper plate is provided on one side of the rotating block, an arc contact spring is provided above the transfer copper plate, a moving arc contact is provided below the transfer copper plate, and a static arc contact is provided at a position opposite to the moving arc contact.

2. A high current arc extinguishing device according to claim 1, characterized in that: The cover plate includes a group of busbar cover plates arranged opposite to each other, and pressure relief sealing strips are provided on the busbar cover plates at positions in contact with the busbars.

3. A high current arc extinguishing device according to claim 1, characterized in that: The moving main contact assembly includes a main contact frame, one end of which is connected to the movable end of the rotating frame, and the other end is provided with a plurality of contact fingers; the fixed end of the rotating frame is provided on a copper block, and the copper block is provided on the inner end surface of the outgoing busbar.

4. A high current arc extinguishing device according to claim 3, characterized in that: The contact fingers are connected in series and mounted in parallel on the main contact frame via a rotating shaft, and each contact finger is equipped with a contact finger spring. The end of each contact finger is welded to the copper block via a copper braid.

5. A high current arc extinguishing device according to claim 3, characterized in that: Contact pieces are welded to the contact finger contacts and the static main contact busbar respectively.

6. A high current arc extinguishing device according to claim 3, characterized in that: The moving main contact assembly is further provided with a connecting rod, which is connected to a crank arm through a pin shaft.

7. A high current arc extinguishing device according to claim 1, characterized in that: A limiting nut is provided on the upper portion of the arc contact spring, and a limiting bolt is provided below the adapter copper plate.

8. A high current arc extinguishing device according to claim 7, characterized in that: The moving arc contact assembly is further provided with a soft connection, and the soft connection is connected to the outgoing busbar through a straight copper plate; the static main contact busbar and the static arc contact are connected through a bent copper plate.

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