Deionization device, arc extinguish chamber structure and circuit breaker

Abstract

The invention discloses a deionization device, an arc extinguish chamber structure and a circuit breaker, the deionization device comprises a shell, the shell is provided with a vent hole, the shell is internally provided with an accommodating cavity, the accommodating cavity is internally provided with a foamed ceramic filter screen, and the foamed ceramic filter screen is used for deionization. Compared with the prior art, the device is small in size, simple in structure, safe and reliable.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breakers, and in particular to an ion elimination device, an arc extinguishing chamber structure and a circuit breaker. Background Art

[0002] Circuit breaker products are widely used in power supply and distribution networks. They refer to a kind of mechanical switch that can connect, carry and disconnect current under normal circuit conditions, and can also connect, carry for a certain time and disconnect current under specified abnormal circuit conditions (such as short circuit). When the short-circuit current is disconnected, an arc will be generated, which has a very high temperature and is a high-temperature plasma. At the same time, the arc will cause varying degrees of ablation of the parts on its generation and movement path, and quickly produce a group of hot ionized gas; the gas contains metal ions. The higher the voltage of the circuit system and the greater the short-circuit current, the stronger the conductivity of the hot ionized gas generated when the arc is disconnected. If there is no effective deionization device on its moving path, it is easy to cause phase-to-phase or relative insulation breakdown, resulting in disconnection failure and expanding the impact of the short circuit.

[0003] Especially in the current new energy power supply and distribution network, the voltage required for the circuit breaker to work normally is getting higher and higher, such as DC2000V, AC1500V and other rated working voltages. At the same time, the circuit breaker is required to have a smaller size to reduce the structural cost of the overall equipment.

[0004] In order to cool and reduce the ionization of arc-extinguishing gas and avoid insulation breakdown problems, the prior art usually adopts three structures: 1. A structure in which mesh plates are distributed at a certain interval. The mesh plates can be insulating plates or metal mesh plates. 2. A foam-like structure made of a metal wire mesh or a metal material. 3. A porous non-metallic part is arranged in the cavity above the arc-extinguishing grid group of the arc-extinguishing chamber. The above-mentioned structures in points 1 and 2 are explained in the background technology content of Chinese patent CN202013860U, and the invention content of Chinese patent CN202013860U involves the structure described in point 3 above.

[0005] The above technical solution has certain shortcomings when applied to the rated working voltage scenario of DC2000V or AC1500V and above: 1. The structure of distributing mesh plates at a certain distance is not efficient in deionizing the gas. Under this condition, the mesh plate structure must be multiplied to avoid the problem of insulation breakdown, which greatly increases the volume of the product.

[0006] 2. Metal mesh, wire mesh, and porous metal foam are used because of the structural strength and machinability of metal. However, since they are made of conductive materials, they need to maintain a certain electrical gap with the arc-extinguishing grid. Therefore, they need to be separated from the arc-extinguishing grid group by an insulating mesh, which is not an ideal ion-eliminating material.

[0007] 3. A porous non-metallic part is directly set in the cavity above the arc extinguishing grid group of the arc extinguishing chamber. In order to achieve a better deionization effect, it is necessary to select porous ceramics with a high mesh density, but at the same time it will increase the pressure in the cavity of the arc extinguishing chamber and cause damage to the bracket or cover plate structure.

[0008] It can be seen that the above structure and material selection are irrational, which leads to the problem of greatly increasing the volume of the product and the risk of insulation breakdown or structural damage.

[0009] Therefore, the present invention needs to provide a small-sized, simple-structured and reliable ion-eliminating device, arc-extinguishing chamber and circuit breaker. Summary of the invention

[0010] The object of the present invention is to provide a deionization device to solve the above-mentioned problems existing in the prior art.

[0011] In order to achieve the above object, the technical solution adopted by the present invention is as follows: A device for eliminating free radicals comprises a shell, wherein the shell has a containing cavity, a first vent hole is provided at the bottom of the containing cavity, a foam ceramic filter is provided in the containing cavity, and the foam ceramic filter is used for eliminating free radicals.

[0012] Furthermore, the foam ceramic filter has mesh holes, and the diameter of the mesh holes is 0.3-3.5MM.

[0013] Furthermore, the shell and the foam ceramic filter are both made of non-conductive materials.

[0014] Furthermore, the foam ceramic filter is made of silicon nitride (Si3N4), zirconium oxide (ZrO2), aluminum oxide (Al2O3) or silicon carbide (SiC).

[0015] Furthermore, a plurality of second ventilation holes are provided on the bottom plate of the accommodating cavity, and the second ventilation holes are arranged along the length direction of the bottom of the accommodating cavity, and the second ventilation holes are located at both ends of the first ventilation holes.

[0016] Furthermore, the invention also includes a sealing ring, which is located around the bottom of the accommodating cavity.

[0017] Furthermore, a groove is provided at the bottom of the accommodating cavity, and the groove is used to install a sealing ring.

[0018] Furthermore, a metal wire mesh is provided between the bottom of the accommodating cavity and the foam ceramic filter mesh.

[0019] The present invention also relates to an arc extinguishing chamber structure, comprising a cover plate, a mesh plate, a bracket, an arc extinguishing grid and an arc isolation wall, wherein the arc isolation wall is located on both sides of the arc extinguishing grid, the mesh plate is installed above the arc extinguishing grid, the cover plate is installed above the mesh plate, and also comprises the above-mentioned deionization device, which is installed above the cover plate.

[0020] The present invention also includes a circuit breaker, wherein the circuit breaker includes the above-mentioned deionization device.

[0021] Furthermore, the deionization device comprises: an upper shell, a lower shell and a foam ceramic filter, the shell comprises an upper shell and a lower shell, the upper shell is buckled on the lower shell, The accommodating cavity is located on the lower shell, the end of the accommodating cavity close to the circuit breaker is an air inlet end, and the end of the accommodating cavity away from the circuit breaker is an air outlet end, and a plurality of air outlet holes are arranged on the air outlet end.

[0022] The beneficial effects of the present invention are: Since foam ceramic is used as the deionization device and is placed in the housing cavity, the overall volume is small and has excellent deionization effect. As a module, the component can match the arc extinguishing chamber or product housing structure of the prior art, and the structure is simple and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a structural diagram of a housing according to an embodiment of the present invention; Figure 2 is a structural diagram of a housing according to an embodiment of the present invention; Figure 3 It is an installation diagram of the foam ceramic filter screen and the housing of the present invention; Figure 4 for Figure 3 AA cross-section diagram; Figure 5 This is a structural diagram of a housing according to an embodiment of the present invention; Figure 6 This is a structural diagram of a housing according to an embodiment of the present invention; Figure 7 This is a structural diagram of a housing according to a second embodiment of the present invention; Figure 8 This is a structural diagram of a housing according to a second embodiment of the present invention; Fig. 9 It is a combined diagram of the deionization device and the arc extinguishing chamber of the present invention; Fig.10 It is a combined diagram of the deionization device and the arc extinguishing chamber of the present invention; Fig.11 for Fig.10 BB cross-section diagram; Fig.12 The deionization device of the third embodiment of the present invention; Fig.13 The deionization device of the third embodiment of the present invention; Fig.14 The deionization device of the third embodiment of the present invention; Fig.15 This is an installation diagram of the deionization device and circuit breaker of the third embodiment of the present invention.

[0024] Reference numerals: Shell 1, first vent hole 101, accommodating cavity 102, second vent hole 103; Foam ceramic filter 2, sealing ring 3, metal wire woven mesh 4, arc extinguishing chamber structure 5; Cover plate 51, mesh plate 52, bracket 53, arc extinguishing grid 54, arc isolation wall 55; An upper shell 601 , a lower shell 602 , a containing cavity 603 , and an air outlet 604 . DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation methods described herein are only used to explain the present invention and are not used to limit the present invention.

[0026] Among them, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention or simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not 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 features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0028] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0029] In addition, in order to better illustrate the present application, numerous specific details are given in the following specific embodiments. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In some examples, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.

[0030] like Figures 1 to 6 As shown, a device for eliminating ionization includes: a shell 1, a first vent hole 101 is provided on the shell 1, a receiving cavity 102 is provided in the shell, a foam ceramic filter 2 is provided in the receiving cavity 102, and the foam ceramic filter 2 is used for eliminating ionization.

[0031] Through the above method, it can be known that since the foam ceramic filter 2 is used as a deionization device and is placed in the accommodating cavity of the housing 1, the overall volume is reduced and has an excellent deionization effect. The device can be matched with the arc extinguishing chamber or product housing structure of the prior art as a module, and the structure is simple and reliable. The gas can pass through the foam ceramic filter 2 and then pass through the first vent 101 to be discharged from the housing 1.

[0032] In addition, it is worth noting that the foam ceramic filter 2 has a mesh, the diameter of the mesh is 0.3-3.5MM, and in actual use, the diameter of the mesh can also be 0.5MM, 1.5MM, 2MM, and is not limited to the specific ones. The foam ceramic filter 2 is composed of a three-dimensional network of lightweight but strong pillars or walls, forming a porous open network structure, the pores of which are interconnected, and the pillars are solid and completely dense.

[0033] In addition, in this embodiment, the housing 1 and the foam ceramic filter 2 are both made of non-conductive materials. Since they are made of non-conductive materials, they are very convenient to install.

[0034] Specifically, the foam ceramic filter 2 is made of silicon nitride (Si3N4), zirconium oxide (ZrO2), aluminum oxide (Al2O3) or silicon carbide (SiC).

[0035] In addition, it is worth noting that Figure 7-8As shown, a plurality of second vent holes 103 are provided on the bottom plate of the accommodating cavity 102, and the second vent holes 103 are arranged along the length direction of the bottom of the accommodating cavity 102, and the second vent holes 103 are located at both ends of the first vent holes 101. When the air pressure in the accommodating cavity 102 is relatively high, a part of the gas is discharged from the shell 1 through the second vent holes 103, so as to avoid the explosion of the deionization device due to the large amount of gas, thereby extending the service life.

[0036] In addition, in order to further ensure that all gases are discharged from the shell to the first vent hole 101 and the second vent hole 103, the shell also includes a sealing ring 3, which is located around the bottom of the accommodating cavity. In this embodiment, the sealing ring 3 is made of rubber. In order to install the sealing ring 3, a groove is also provided at the bottom of the accommodating cavity. The groove is used to install the sealing ring 3. During assembly, the sealing ring 3 is installed in the groove to prevent the sealing ring from moving.

[0037] In order to further ensure the deionization effect, a metal wire mesh 4 is provided between the bottom of the accommodating cavity 102 and the foam ceramic filter 2 .

[0038] Since the first vent hole 101 and the second vent hole 103 are provided, the gas generated by the circuit breaker passes through the arc extinguishing chamber, then passes through the foam ceramic filter 2, and then passes through the first vent hole and the second vent hole before being discharged out of the housing.

[0039] like Figures 9 to 11 As shown, the present invention also relates to an arc extinguishing chamber structure 5, including a cover plate 51, a mesh plate 52, a bracket 53, an arc extinguishing grid 54 and an arc isolation wall 55, wherein the arc isolation wall 55 is located on both sides of the arc extinguishing grid 54, the bracket 53 is installed above the arc extinguishing grid, and the mesh plate 52 is installed above the bracket 53. In this embodiment, the mesh plate 52 is a multi-layer mesh plate arrangement, the cover plate 51 is installed above the mesh plate 52, and also includes the above-mentioned deionization device, which is installed above the cover plate 51 and is firmly fixed above the arc extinguishing chamber by screws. Therefore, the above-mentioned effect can also be achieved by installing the above-mentioned deionization device.

[0040] like Figure 12-15 As shown, the present invention also includes a circuit breaker, which includes the above-mentioned deionization device, and the circuit breaker also achieves the above-mentioned effect.

[0041] Specifically, the deionization device includes: an upper shell 601, a lower shell 602 and a foam ceramic filter 2. The shell includes an upper shell 601 and a lower shell 602. The upper shell 601 is buckled on the lower shell 602. The accommodating cavity 603 is located on the lower shell 602, the end of the accommodating cavity 603 close to the circuit breaker is the air inlet end, and the end of the accommodating cavity away from the circuit breaker is the air outlet end, and a plurality of air outlet holes 604 are provided on the air outlet end. In this embodiment, the foam ceramic filter 2 is a multi-layer arrangement.

[0042] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be considered as the scope of protection of the present invention.

Claims

1. A device for eliminating dissociation, characterized in that: include: The shell has a containing cavity, the bottom of the containing cavity is also provided with a first vent hole, a foam ceramic filter is arranged in the containing cavity, and the foam ceramic filter is used to eliminate free air.

2. The deionization device according to claim 1, characterized in that: The foam ceramic filter has mesh holes, and the diameter of the mesh holes is 0.3-3.5MM.

3. The deionization device according to claim 1, characterized in that: The shell and the foam ceramic filter are both made of non-conductive materials.

4. The deionization device according to claim 3, characterized in that: The foam ceramic filter is made of silicon nitride (Si3N4), zirconium oxide (ZrO2), aluminum oxide (Al2O3) or silicon carbide (SiC).

5. The deionization device according to claim 1, characterized in that: A plurality of second ventilation holes are arranged on the bottom plate of the accommodating cavity. The second ventilation holes are arranged along the length direction of the bottom of the accommodating cavity. The second ventilation holes are located at both ends of the first ventilation holes.

6. The deionization device according to claim 5, characterized in that: The housing also includes a sealing ring, which is located around the bottom of the housing cavity. The bottom of the housing cavity is also provided with a groove, and the groove is used to install the sealing ring.

7. The deionization device according to claim 1, characterized in that: A metal wire braided mesh is provided between the bottom of the accommodating cavity and the foam ceramic filter mesh.

8. An arc extinguishing chamber structure, characterized in that: It includes a cover plate, a mesh plate, a bracket, an arc-extinguishing grid and an arc-isolating wall, wherein the arc-isolating wall is located on both sides of the arc-extinguishing grid, the mesh plate is installed above the arc-extinguishing grid, the cover plate is installed above the mesh plate, and also includes the above-mentioned deionization device, which is installed above the cover plate.

9. A circuit breaker, comprising the above-mentioned deionization device, characterized in that: The deionization device is the same as the deionization device described in any one of claims 1 to 8.

10. The circuit breaker according to claim 9, characterized in that: The deionization device comprises: an upper shell, a lower shell and a foam ceramic filter screen, wherein the shell comprises an upper shell and a lower shell, and the upper shell is buckled on the lower shell. The accommodating cavity is located on the lower shell, the end of the accommodating cavity close to the circuit breaker is an air inlet end, and the end of the accommodating cavity away from the circuit breaker is an air outlet end, and a plurality of air outlet holes are arranged on the air outlet end.

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