Direct-current load switch with magnetic quenching device

Abstract

The utility model relates to the technical field of low-voltage direct-current components, and discloses a direct-current load switch with a magnetic blow-out arc extinguishing device, which comprises a surface cover, a mould pressing frame, a contact system, an operating mechanism, a magnetic blow-out system, an arc extinguishing cover, an auxiliary switch, a wiring terminal and a fixed bracket, and is characterized in that the contact system is mounted in the mould pressing frame. The direct-current load switch with the magnetic quenching device has an integral mould pressing structure and a modular structural design, is small in size and high in strength, adopts an independent arc contact advanced design, acts side by side with a plurality of main contacts and is in multi-point contact with the main contacts, so that the main contacts can be prevented from being burnt out too fast, and a good arc striking effect is achieved; through the magnetic force generated by the breaking current, the electric arc is rapidly introduced into the arc extinguishing cover, the breaking performance is improved, the breaking effect on the small current is better, the mechanism is locally reinforced, and the short-time endurance capability of the switch is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage DC components, in particular to a DC load switch with a magnetic blow-out arc device. Background Art

[0002] In urban rail transit DC traction power supply systems, to achieve large-scale bilateral power supply without power outages and switching, a DC load switch with large breaking capacity, strong connection and short-circuit current tolerance, compact size, and easy operation and maintenance is required. If any outfeed switch fails or the traction substation is decoupled for maintenance, the DC load switch can be quickly closed to achieve large-scale bilateral power supply. This greatly facilitates and speeds power dispatching operations during operation, fundamentally resolving the problem of train suspensions caused by power outages and switching operations.

[0003] However, the existing load switches still have the following disadvantages:

[0004] 1. The load switch adopts the low-voltage frame circuit breaker type, adopts the wiring form of three-pole series or four-pole series voltage division, and the switch size is relatively large;

[0005] 2. The main circuit is not equipped with arc contacts, and a DC arc extinguishing cover is used to interrupt larger currents;

[0006] 3. No magnetic blow system is set, and small current is difficult to disconnect; or an external constant magnetic field is connected, and a self-excitation excitation coil is not used. When the current is reversed, the external magnetic field also needs to be reversed, and the switch has polarity distinction;

[0007] 4. Short-term tolerance is not high. Utility Model Content

[0008] The purpose of the utility model is to solve the above-mentioned defects and provide a DC load switch with a magnetic blow-out device to achieve an integral molded structure, modular structure design, small size and high strength DC load switch.

[0009] In order to solve the above technical problems, the utility model provides the following technical solutions: a DC load switch with a magnetic blowout arc extinguishing device, comprising a cover, a molded frame, a contact system, an operating mechanism, a magnetic blowout system, an arc extinguishing hood, an auxiliary switch, a terminal block and a fixing bracket, wherein the contact system is installed inside the molded frame, the operating mechanism and the auxiliary switch are installed at the internal front end of the molded frame, the arc extinguishing hood is installed at the internal upper end of the molded frame, the cover covers the operating mechanism and the terminal block and is fixed to the molded frame, and the upper end of the terminal block is exposed from the cover;

[0010] The contact system includes a moving contact device and a stationary contact device. The moving contact device includes a moving arc contact and a moving contact. The moving arc contact is widened. The stationary contact device includes a stationary contact and a stationary arc contact. A connecting rod is hinged between the moving contact device and the operating mechanism.

[0011] The magnetic blowing system is provided with an excitation arc striking system, including a front arc striking row, a rear arc striking row, an excitation core, an excitation block, an excitation coil, a protective cover, a return row and a magnetic conductive plate. The excitation block is partially wrapped by the rear arc striking row, and the excitation coil is wound on the excitation core. The excitation coil is a symmetrical spiral coil, one end of the excitation coil is fixedly connected to the front arc striking row, and the other end of the excitation coil is fixedly connected to the return row. The protective cover is sleeved on the outside of the excitation coil, the rear arc striking row is connected to the static arc contact, the magnetic conductive plate is connected to the excitation core, and the upper part of the magnetic conductive plate is located inside the arc extinguishing cover.

[0012] Preferably, the operating mechanism includes a main shaft and a pressing block, and the pressing block presses the main shaft of the operating mechanism.

[0013] Preferably, there are two contact systems, and a magnetic blow system is provided in the two contact systems.

[0014] Preferably, two return bars are provided, and the two return bars are distributed on both sides of the excitation core.

[0015] Preferably, two magnetic conductive plates are provided, and the two magnetic conductive plates are respectively fixed at two ends of the excitation core.

[0016] Preferably, the number of the moving arc contact is 1, and the number of the moving contacts is 10.

[0017] Preferably, the lower end of the connecting rod is connected to a bracket, and the lower end of the bracket is connected to the dynamic main busbar.

[0018] Preferably, the right end of the static arcing contact is connected to a static main busbar, and the static main busbar is located above the dynamic main busbar.

[0019] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0020] First, the utility model has an integral molded structure and a modular structural design, which is small in size and high in strength.

[0021] Second, the utility model adopts an independent arc contact advance design, and operates side by side with multiple main contacts, with multiple points of contact, which can avoid the main contacts from burning out too quickly and achieve a good arc striking effect.

[0022] Third, the utility model has a symmetrical double helical coil to form a self-excited excitation system, which quickly introduces the arc into the arc extinguishing cover through the magnetic force generated by the breaking current itself, thereby improving the breaking performance and having a better breaking effect on small currents.

[0023] Third, the present invention partially strengthens the mechanism, greatly improving the short-term tolerance of the switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a three-dimensional diagram of the load switch of the utility model;

[0025] Figure 2 This is a rear perspective view of the load switch of the utility model;

[0026] Figure 3 This is a cross-sectional view of the load switch of the utility model;

[0027] Figure 4 This is a three-dimensional diagram of the molded frame of the load switch of the utility model;

[0028] Figure 5 This is a structural diagram of the contact system of the utility model;

[0029] Figure 6 This is the structural diagram of the magnetic blowing system of the utility model;

[0030] Figure 7 This is a schematic diagram of the early-stage current breaking of the utility model;

[0031] Figure 8 This is a schematic diagram of the current in the later stage of breaking of the utility model.

[0032] Among them: 1. Surface cover; 2. Molded frame; 3. Contact system; 4. Operating mechanism; 41. Main shaft; 42. Pressure block; 5. Magnetic blowing system; 51. Front arcing bar; 52. Rear arcing bar; 53. Excitation core; 54. Excitation block; 55. Excitation coil; 56. Protective cover; 57. Return bar; 58. Magnetic plate; 6. Arc extinguishing cover; 7. Auxiliary switch; 8. Terminal block; 9. Fixed bracket; 10. Moving contact device; 101. Moving arc contact; 102. Moving contact; 103. Connecting rod; 104. Moving main busbar; 11. Static contact device; 111. Static contact; 112. Static arc contact; 113. Static main busbar. DETAILED DESCRIPTION

[0033] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the specific embodiments of the present invention. Obviously, the specific embodiments described are only part of the present invention, not all of it. Based on the specific embodiments of the present invention, all other specific embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0034] The following is a specific implementation of a DC load switch with a magnetic blow-out device.

[0035] See also Figure 1-8 A DC load switch with a magnetic blowout arc extinguishing device includes a cover 1, a molded frame 2, a contact system 3, an operating mechanism 4, a magnetic blowout system 5, an arc extinguishing cover 6, an auxiliary switch 7, a terminal block 8, and a fixing bracket 9. The contact system 3 is installed inside the molded frame 2, the operating mechanism 4 and the auxiliary switch 7 are installed at the internal front end of the molded frame 2, the arc extinguishing cover 6 is installed at the internal upper end of the molded frame 2, the cover 1 covers the operating mechanism 4 and the terminal block 8 and is fixed to the molded frame 2, and the upper end of the terminal block 8 is exposed from the cover 1.

[0036] Through the above technical solution, the load switch drives the contact system through the operating mechanism to open and close, and when the operating mechanism 4 completes the opening and closing action, the auxiliary switch 7 is switched.

[0037] The contact system 3 includes a moving contact device 10 and a stationary contact device 11. The moving contact device 10 includes a moving arcing contact 101 and a moving contact 102. The moving arcing contact 101 is designed to be widened. The stationary contact device 11 includes a stationary contact 111 and a stationary arcing contact 112. A connecting rod 103 is hinged between the moving contact device 10 and the operating mechanism 4.

[0038] Through the above technical solution, the moving contact device 10 consists of one moving arc contact 101 and ten moving contacts 102, and the moving arc contact 101 is widened to increase the current carrying capacity of the switch. The moving contact device 10 is hinged to the operating mechanism 4 through the connecting rod 103, and is swung back and forth through the operating mechanism 4 to perform opening and closing.

[0039] An excitation arc striking system is provided in the magnetic blowing system 5, including a front arc striking row 51, a rear arc striking row 52, an excitation core 53, an excitation block 54, an excitation coil 55, a protective cover 56, a return row 57 and a magnetic plate 58. The excitation block 54 is partially wrapped by the rear arc striking row 52, and the excitation coil 55 is wound on the excitation core 53. The excitation coil 55 is a symmetrical spiral coil. One end of the excitation coil 55 is fixedly connected to the front arc striking row 51, and the other end of the excitation coil 55 is fixedly connected to the return row 57. The protective cover 56 is sleeved on the outside of the excitation coil 55, the rear arc striking row 52 is connected to the static arc contact 112, the magnetic plate 58 is connected to the excitation core 53, and the upper part of the magnetic plate 58 is located inside the arc extinguishing cover 6.

[0040] Through the above technical solution, the excitation coil 55 is a symmetrical spiral coil, one end of which is fixed to the front arc-starting bar 51 and the other end is connected to the return bar 57, directing the current to the moving contact assembly 10, forming a complete return path. A protective cover 56 is placed over the excitation coil 55 to prevent arc damage. The rear arc-starting bar 52 is connected to the static arc contact 112 to start the arc, and the magnetic plate 58 is connected to the excitation core 53 to conduct magnetic flux.

[0041] Specifically, the operating mechanism 4 includes a main shaft 41 and a pressing block 42 , and the pressing block 42 presses the main shaft 41 of the operating mechanism 4 .

[0042] Specifically, there are two contact systems 3 , and the two contact systems 3 are provided with magnetic blowing systems 5 .

[0043] Specifically, two return rails 57 are provided, and the two return rails 57 are distributed on both sides of the excitation core 53 .

[0044] Specifically, two magnetic conductive plates 58 are provided, and the two magnetic conductive plates 58 are respectively fixed at both ends of the excitation core 53 .

[0045] Specifically, the number of moving arcing contacts 101 is one, and the number of moving contacts 102 is ten.

[0046] Specifically, the lower end of the connecting rod 103 is connected to a bracket, and the lower end of the bracket is connected to the dynamic main busbar 104.

[0047] Specifically, the right end of the static arcing contact 112 is connected to the static main busbar 113 , and the static main busbar 113 is located above the dynamic main busbar 104 .

[0048] Working principle: When the operating mechanism 4 executes the closing command, the crank arm on the operating mechanism pushes the moving contact device 10 to quickly approach the static contact device 11. The moving arcing contact 101 first contacts the static arcing contact 112, and then the moving contact 102 contacts the static contact 111, completing the closing action. When the operating mechanism 4 executes the opening command, the moving contact device 10 quickly moves away from the static contact device 11. The moving contact 102 first separates from the static contact 111, and then the moving arcing contact 101 separates from the static arcing contact 112, thus maximally protecting the main contacts from excessive burning, which would affect the life of the switch.

[0049] When the switch needs to be disconnected under load, in the early stage of disconnection, the current loop flows from the static main busbar 113 through the moving arc contact 101 and the moving contact 102, and then flows through the moving main busbar 104 to form a complete return channel. At this time, the arc burns between the moving arc contact 101 and the static arc contact 112. In the middle stage of disconnection, the current loop flows from the static main busbar 113 through the rear arcing bar 52, the front arcing bar 51, the excitation coil 55, the return bar 57, and then flows through the moving main busbar 104 to form a complete return flow. At this time, the arc jumps onto the rear arc-striking row 52 and the front arc-striking row 51 to avoid contact burning. At the same time, the breaking current generates a magnetic field when flowing through the excitation coil 55. After passing through the magnetic conductive plate 58, the magnetic field is distributed between the moving and static contacts, generating an upward electromotive force on the arc, promoting the rapid upward movement of the arc. In the later stage of breaking, the arc is blown into the arc-extinguishing grid in the arc-extinguishing cover 6 by the electromagnetic force and cut into multiple short arcs. The arc voltage rises. At the same time, the arc-extinguishing grid has a cooling effect on the arc, and the arc is extinguished quickly.

[0050] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0051] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A DC load switch with a magnetic blowout arc extinguishing device, comprising a cover (1), a molded frame (2), a contact system (3), an operating mechanism (4), a magnetic blowout system (5), an arc extinguishing cover (6), an auxiliary switch (7), a terminal (8) and a fixing bracket (9), characterized in that: The contact system (3) is installed inside the molded frame (2), the operating mechanism (4) and the auxiliary switch (7) are installed at the front end of the molded frame (2), the arc extinguishing cover (6) is installed at the upper end of the molded frame (2), the cover (1) covers the operating mechanism (4) and the terminal block (8) and is fixed to the molded frame (2), and the upper end of the terminal block (8) is exposed from the cover (1); The contact system (3) comprises a moving contact device (10) and a stationary contact device (11), the moving contact device (10) comprises a moving arc contact (101) and a moving contact (102), the moving arc contact (101) is of widened design, the stationary contact device (11) comprises a stationary contact (111) and a stationary arc contact (112), and a connecting rod (103) is hinged between the moving contact device (10) and the operating mechanism (4); The magnetic blowing system (5) is provided with an excitation arc striking system, comprising a front arc striking row (51), a rear arc striking row (52), an excitation core (53), an excitation block (54), an excitation coil (55), a protective cover (56), a return row (57) and a magnetic conductive plate (58), wherein the excitation block (54) is partially wrapped by the rear arc striking row (52), the excitation coil (55) is wound on the excitation core (53), the excitation coil (55) is a symmetrical spiral coil, one end of the excitation coil (55) is fixedly connected to the front arc striking row (51), and the other end of the excitation coil (55) is fixedly connected to the return row (57), the protective cover (56) is sleeved on the outside of the excitation coil (55), the rear arc striking row (52) is connected to the static arc contact (112), the magnetic conductive plate (58) is connected to the excitation core (53), and the upper part of the magnetic conductive plate (58) is located inside the arc extinguishing cover (6).

2. A DC load switch with a magnetic blowout device according to claim 1, characterized in that: The operating mechanism (4) comprises a main shaft (41) and a pressing block (42), wherein the pressing block (42) presses the main shaft (41) of the operating mechanism (4).

3. A DC load switch with a magnetic blowout device according to claim 1, characterized in that: There are two contact systems (3), and a magnetic blowing system (5) is provided in the two contact systems (3).

4. A DC load switch with a magnetic blowout device according to claim 1, characterized in that: There are two return rails (57), and the two return rails (57) are distributed on both sides of the excitation core (53).

5. A DC load switch with a magnetic blowout device according to claim 1, characterized in that: Two magnetic conductive plates (58) are provided, and the two magnetic conductive plates (58) are respectively fixed at two ends of the excitation core (53).

6. A DC load switch with a magnetic blowout device according to claim 1, characterized in that: The number of the moving arc contact (101) is one, and the number of the moving contacts (102) is ten.

7. A DC load switch with a magnetic blowout device according to claim 1, characterized in that: The lower end of the connecting rod (103) is connected to a bracket, and the lower end of the bracket is connected to a dynamic main busbar (104).

8. A DC load switch with a magnetic blowout device according to claim 1, characterized in that: The right end of the static arc contact (112) is connected to a static main busbar (113), and the static main busbar (113) is located above the dynamic main busbar (104).

Images