A zero fly contact module

Abstract

A zero arc contact module comprises a shell, an internal cavity, a rotating axis in the cavity, arc discharge ports at both ends of the shell, and the arc discharge ports being symmetrically arranged with respect to the center of the rotating axis; a static contact assembly arranged at both ends of the shell; a movable contact assembly rotatably arranged in the cavity and rotatable around the rotating axis and in contact with or separated from the static contact assemblies at both sides; arc extinguishing chambers arranged at both sides of the shell, at least one filter plate and a blocking plate arranged at the arc discharge ports, the filter plate being arranged inside the blocking plate, a plurality of arrayed gas holes being arranged on the filter plate and the blocking plate, and the pore size of the filter plate being larger than that of the blocking plate. Through the dual effects of the filter plate and the blocking plate, zero arc can be achieved, and the phenomenon of arc reignition caused by the blockage of arc particles and the failure of gas discharge can be prevented.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical appliances, specifically to a zero-arc contact module. Background Technology

[0002] Existing molded case circuit breakers use a modular breaking structure to achieve a simpler installation method. However, during the breaking process, an electric arc may be ejected, which may burn the bus system or other components, posing a safety hazard.

[0003] As the electric arc is cut, cooled, and extinguished by the arc-extinguishing grid, a large amount of high-temperature ionized gas is released to the outside of the breaking structure during the breaking process. These gases contain a large number of metal ions, so under the conditions of high voltage and small electrical clearance, phase-to-phase breakdown is very likely to occur.

[0004] Reasonably reducing the temperature of the aforementioned high-temperature free gas and performing deionization treatment before the high-temperature free gas is ejected from the circuit breaker and discharged into the external environment can effectively improve the reliability of the breaking structure. Most current zero-arc solutions involve placing a blocking plate metal mesh at the arc ejection port. Due to the small gaps in the metal mesh, metal particles will accumulate on the metal mesh, causing the gas inside the circuit breaker to not be discharged in time, and the arc will reignite. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a zero-arc contact module.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A zero-arc flyback contact module, comprising:

[0008] The housing has an internal cavity with a rotation axis, and both ends of the housing are provided with arc nozzles, which are symmetrically arranged with respect to the center of the rotation axis.

[0009] A stationary contact assembly is disposed at both ends of the housing;

[0010] The moving contact assembly is rotatably disposed within the cavity and can rotate around the rotation axis, and can contact or separate from the stationary contact assemblies located on both sides respectively.

[0011] Arc-extinguishing chambers located on both sides of the casing,

[0012] At least one filter plate and one blocking plate are provided at the jet nozzle, and the filter plate is located inside the blocking plate. Both the filter plate and the blocking plate are provided with a plurality of arrayed air holes, and the hole diameter of the filter plate is larger than that of the blocking plate.

[0013] A gap is provided between the filter plate and the blocking plate.

[0014] The jet nozzle is provided with several slots, and the filter plate and the blocking plate are inserted into the slots.

[0015] The filter plate is a single perforated plate or multiple perforated plates stacked together.

[0016] The blocking plate is a perforated plate or a mesh plate woven from metal wire, or multiple perforated plates or mesh plates stacked together.

[0017] The gap between the pores of the filter plate is larger than the gap between the pores of the blocking plate.

[0018] The filter plate has a pore diameter of 2.5 ± 0.5 mm.

[0019] The diameter of the pores in the blocking plate is 0.38±0.05mm.

[0020] The beneficial effects of this utility model are as follows: By setting a filter plate and a blocking plate at the arc nozzle, the filter plate can block larger arc particles, preventing them from clogging the pores of the blocking plate. At the same time, the blocking plate can also block the remaining small arc particles, thus preventing arc particles from being ejected from the contact module. Through the dual action of the filter plate and the blocking plate, not only can zero arcing be achieved, but also the blockage of arc particles can be prevented from causing gas to be unable to escape, thus preventing the phenomenon of arc reignition. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model.

[0022] Figure 2 This is the front view of the present invention.

[0023] Figure 3 This is an exploded view of the filter plate and the blocking plate of this utility model.

[0024] Figure 4 The graph is a function graph.

[0025] Figure 5 This is a schematic diagram showing the ablation of the arc-extinguishing chamber after the test.

[0026] Figure 6 This is a schematic diagram showing the condition of the filter plate and the blocking plate after the experiment. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0029] like Figure 1 and Figure 2 As shown, a zero-flying-arc contact module is used in molded case circuit breakers as a contact mechanism and can be driven to open and close by the operating mechanism of the molded case circuit breaker. Typically, three modules are arranged side-by-side inside the molded case circuit breaker.

[0030] The zero-flash contact module includes a housing 100 with a cavity. The cavity houses a rotatable moving contact assembly, a stationary contact assembly that cooperates with the moving contact assembly, and an arc-extinguishing chamber corresponding to both the moving and stationary contact assemblies. The front end of the arc-extinguishing chamber corresponds to both the moving and stationary contact assemblies, and its rear end communicates with an arc-spraying nozzle. High-temperature gas generated within the arc-extinguishing chamber is ejected from the arc-spraying nozzle.

[0031] The housing 100 is composed of a first housing and a second housing joined together, forming a cavity between them, and the cavity has a rotation axis, the rotation axis being as follows: Figure 1 As shown by the dashed line a, the moving contact assembly can rotate relative to the rotation axis, and both ends of the housing are provided with arc spray nozzles 110, which are symmetrically arranged with respect to the rotation axis.

[0032] The stationary contact assembly 200 is disposed at both ends of the housing 100, one end of which is U-shaped and has a stationary contact protective cover 210 on the side facing the moving contact assembly.

[0033] The moving contact assembly 300 is rotatably disposed within the cavity and can rotate around the rotation axis, and can contact or separate from the stationary contact assemblies 200 located on both sides respectively. The moving contact assembly includes a rotatable rotating shaft and a moving contact. The rotating shaft can drive the moving contact to rotate under the action of external force, thereby causing the moving contact to contact or separate from the stationary contact. At the same time, the electric arc generated when the two separate is cut and extinguished by the arc extinguishing chamber.

[0034] The arc-extinguishing chambers 600, located on both sides of the housing 100, have their openings facing the moving and stationary contacts.

[0035] like Figure 3 As shown, at least one filter plate 400 and a blocking plate 500 are provided at the spray nozzle 110, and the filter plate 400 is located inside the blocking plate 500. Both the filter plate 400 and the blocking plate 500 are provided with a plurality of arrayed air holes, and the hole diameter of the filter plate 400 is larger than the hole diameter of the blocking plate 500.

[0036] By setting a filter plate and a blocking plate at the arc nozzle, the filter plate blocks larger arc particles, preventing them from clogging the pores of the blocking plate. At the same time, the blocking plate also blocks the remaining small arc particles, thus preventing them from being ejected from the contact module. Through the dual action of the filter plate and the blocking plate, not only can zero arc flash be achieved, but arc particles can also prevent gas from being blocked and causing arc reignition.

[0037] The inner filter plate uses a large-aperture mesh: it first intercepts large, high-temperature molten metal particles, slag, and large splashes generated during arc breaking. These large particles have high kinetic energy and high temperature; if they directly impact the outer fine mesh, they can easily cause ablation, blockage, or deformation.

[0038] The outer baffle plate uses a small-aperture mesh to further block smaller metal vapor condensation particles, incompletely melted fine dust, and even smaller fragments carried out by the airflow that the inner mesh fails to intercept. It provides finer filtration, ensuring that the final ejected particles are as few and small as possible.

[0039] The combination of these two components can significantly reduce the amount of conductive and corrosive metal particles ejected to the outside of the circuit breaker. At the same time, the filter plate has a larger pore size, which reduces resistance to hot expanding gases, allowing high-temperature and high-pressure gases to pass through the initial stage more quickly and smoothly. This helps to quickly release the pressure peak in the arc-extinguishing chamber and avoid pressure buildup that could lead to damage to the casing or arc reignition.

[0040] A gap 120 is provided between the filter plate 400 and the blocking plate 500. This gap is designed to deposit some of the arc particles, preventing blockage of the pores in the fault layer.

[0041] The nozzle is provided with several slots 130, and the filter plate 400 and the blocking plate 500 are inserted into the slots 130. The slot design is used to improve the installation reliability of the filter plate and the blocking plate.

[0042] The filter plate 400 is a single perforated plate or multiple perforated plates stacked together. It is constructed using a metal plate with perforations.

[0043] The blocking plate 500 is a perforated plate or a mesh plate woven from metal wire, or multiple perforated plates or mesh plates stacked together. Preferably, it is a mesh plate woven from metal wire or a directly formed metal wire mesh.

[0044] The gaps between the pores of the filter plate 400 are larger than the gaps between the pores of the blocking plate 500, thus achieving a filtering effect.

[0045] Gas flow rate Q = A* v Where A is the area of ​​the pores. v Let be the velocity of the gas.

[0046] Gas pressure ΔP = ρv 2 / 2, where ρ Let be the density of the gas.

[0047] Based on the gas flow rate and pressure mentioned above, we can obtain ΔP = ΡQ 2 / 2A 2 Since the gas density and flow rate are constant during the separation process, the above formula simplifies to ΔP = k / A 2 .

[0048] This leads to the graph of the function, as shown below. Figure 4 As shown.

[0049] As can be seen from the function graph, the smaller the area of ​​the pores, the greater the gas pressure. At this time, the greater pressure is conducive to blowing the electric arc towards the arc-extinguishing chamber.

[0050] Considering factors such as arc extinguishing and pressure, experiments have verified that when the pore diameter of the filter layer is 2.5 mm,

[0051] The arc-extinguishing effect of the product is best when the pore diameter of the blocking layer is 0.38 mm.

[0052] After testing, such as Figure 5 As shown, after the gas enters the arc-extinguishing chamber, the chamber ablates well, while metal particle residue remains on the surface of the filter plate. Figure 6 The image on the left shows that the filter plate blocked large metal particles, and the plate showed good ablation characteristics. Figure 6 As shown in the image on the right, both factors increase the pressure and prevent the electric arc from being ejected.

[0053] The embodiments should not be regarded as limitations on the present invention, but any improvements made based on the spirit of the present invention should be within the protection scope of the present invention.

Claims

1. A zero-arc flyback contact module, comprising: The housing (100) has a built-in cavity with a rotation axis inside, and both ends of the housing are provided with spray nozzles (110), and the spray nozzles (110) are symmetrically arranged with respect to the center of the rotation axis. A stationary contact assembly (200) is disposed at both ends of the housing (100); The moving contact assembly (300) is rotatably disposed in the cavity and can rotate around the rotation axis, and respectively contact or separate from the stationary contact assemblies (200) located on both sides; Arc-extinguishing chambers (600) are located on both sides of the housing (100). The feature is that: at least one filter plate (400) and a blocking plate (500) are provided at the spray nozzle (110), and the filter plate (400) is located inside the blocking plate (500), and both the filter plate (400) and the blocking plate (500) are provided with a plurality of arrayed air holes, and the hole diameter of the filter plate (400) is larger than the hole diameter of the blocking plate (500).

2. The zero-arc contact module according to claim 1, characterized in that: A gap (120) is provided between the filter plate (400) and the blocking plate (500).

3. The zero-arc flyback contact module according to claim 1, characterized in that: The nozzle is provided with several slots (130), and the filter plate (400) and the blocking plate (500) are inserted into the slots (130).

4. A zero-arc contact module according to claim 1, characterized in that: The filter plate (400) is a perforated plate or multiple perforated plates stacked together.

5. A zero-arc contact module according to claim 1, characterized in that: The blocking plate (500) is a perforated plate or a mesh plate woven from metal wire, or multiple perforated plates or mesh plates stacked together.

6. A zero-arc flyback contact module according to claim 1, characterized in that: The gap between the pores of the filter plate (400) is greater than the gap between the pores of the blocking plate (500).

7. A zero-arc flyback contact module according to claim 1, characterized in that: The filter plate (400) has a pore diameter of 2.5 ± 0.5 mm.

8. A zero-arc contact module according to claim 7, characterized in that: The diameter of the pores in the blocking plate (500) is 0.38±0.05mm.

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