An arc-extinguishing chamber for a miniature circuit breaker and an arc-extinguishing method based on the arc-extinguishing chamber

Abstract

An arc-extinguishing chamber of a miniature circuit breaker and an arc-extinguishing method based on the arc-extinguishing chamber. Mainly solve the problem that the conventional arc-extinguishing chamber can only realize arc-extinguishing through arc-extinguishing grid pieces, and the effect is poor. The characteristics are that the arc-extinguishing chamber further comprises a gas production plate (3) installed in the arc-extinguishing chamber, at least part of the gas production plate is arranged in the exhaust passage; and a core rod (4) installed in the arc-extinguishing chamber and used for generating endothermic reaction with the gas production plate. The arc-extinguishing chamber of the miniature circuit breaker provided by the application can extinguish the arc by reducing the temperature through the endothermic reaction of the gas production plate and the core rod while the arc is divided by the arc-extinguishing grid pieces, and the breaking capacity of the circuit breaker is greatly improved.

Description

Technical Field

[0001] The present invention relates to the field of circuit breakers, and in particular to an arc extinguishing chamber of a miniature circuit breaker and an arc extinguishing method based on the arc extinguishing chamber. Background Art

[0002] In existing switchgear, an arc extinguishing chamber is often used to extinguish the arc. The arc extinguishing ability of the arc extinguishing chamber directly affects the breaking capacity of the switchgear and determines the safety of its electricity use.

[0003] Conventional arc extinguishing chambers can only achieve arc extinguishing through arc extinguishing grids, and the effect is average. Summary of the Invention

[0004] In order to overcome the shortcomings of the background technology, the present invention provides an arc extinguishing chamber of a small circuit breaker, which mainly solves the problem that conventional arc extinguishing chambers can only achieve arc extinguishing effect through arc extinguishing grids, and the effect is poor.

[0005] The technical solution of the present invention is:

[0006] An arc extinguishing chamber of a miniature circuit breaker comprises a frame, a plurality of arc extinguishing grids are mounted on the frame, an exhaust channel is formed between adjacent arc extinguishing grids, and further comprises

[0007] a gas production plate, mounted in the arc extinguishing chamber, at least a portion of the gas production plate being disposed in the exhaust passage;

[0008] The core rod is installed in the arc extinguishing chamber and is used to generate an endothermic reaction with the gas production plate.

[0009] A mounting groove is provided in the gas production plate, and the core rod is installed in the mounting groove.

[0010] A plurality of through grooves are provided on the surface of the gas production plate, and the through grooves are communicated with the mounting grooves.

[0011] The arc extinguishing grid is provided with a positioning groove, and the gas production plate is installed in the positioning groove.

[0012] The gas production plates are multiple and arranged in parallel up and down, and divide the exhaust channel into at least two flow channels in the height direction.

[0013] The gas production plate includes a first gas production plate and a second gas production plate which are arranged opposite to each other along the air flow, and a fusion zone is provided between the first gas production plate and the second gas production plate.

[0014] The arc extinguishing chamber grid comprises a main board, an inlet plate extending outward is provided on the main board, and the positioning groove is provided on the main board.

[0015] The core rod is made of ceramic.

[0016] The arc extinguishing method for the arc extinguishing chamber of a miniature circuit breaker as described above is characterized by comprising the following steps:

[0017] Step 1: When the moving contact and the static contact of the circuit breaker are disconnected, an arc and high-temperature gas are generated, and these gases and the arc enter the arc extinguishing chamber;

[0018] Step 2: The gas generating plate contacts the arc to generate gas, and the surface of the gas generating plate is carbonized by contact with the arc;

[0019] Step 3: The carbonized gas generating plate and the core rod generate an endothermic reaction, which consumes a large amount of arc energy and reduces the temperature in the arc extinguishing chamber to help extinguish the arc.

[0020] The beneficial effects of the present invention are as follows: the present invention provides an arc extinguishing chamber for a small circuit breaker, which can extinguish the arc by reducing the temperature through the endothermic reaction between the gas generating sheet and the core rod while the arc extinguishing grid divides the arc, thereby greatly enhancing the breaking capacity of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional schematic diagram of an embodiment of the present invention.

[0022] Figure 2 The figure is a schematic cross-sectional view of a housing according to an embodiment of the present invention.

[0023] Figure 3 Schematic diagram of a gas production plate according to an embodiment of the present invention.

[0024] Figure 4 This is a waveform diagram of a conventional circuit breaker in the first group of breaking tests of the present invention.

[0025] Figure 5 This is a waveform diagram of the circuit breaker equipped with the arc extinguishing chamber of the present invention in the first group of breaking tests of the present invention.

[0026] Figure 6 This is a waveform diagram of a conventional circuit breaker in the second group of breaking tests of the present invention.

[0027] Figure 7 This is a waveform diagram of the circuit breaker equipped with the arc extinguishing chamber of the present invention in the second group of breaking tests of the present invention.

[0028] Figure 8 This is a waveform diagram of a conventional circuit breaker in the third group of breaking tests of the present invention.

[0029] Figure 9 This is a waveform diagram of the circuit breaker equipped with the arc extinguishing chamber of the present invention in the third group of breaking tests of the present invention. DETAILED DESCRIPTION

[0030] The present invention is further described below with reference to the accompanying drawings. A miniature circuit breaker arc breaker comprises a frame 1, on which are mounted a plurality of arc-quenching grids 2, with an exhaust passage 20 formed between adjacent arc-quenching grids. The frame also includes a gas-generating plate 3 mounted within the arc breaker, with at least a portion of the gas-generating plate positioned within the exhaust passage. A core rod 4 is mounted within the arc breaker and configured to generate an endothermic reaction with the gas-generating plate. During the interruption process, the gas-generating material partially carbonizes under the action of the arc. The carbonized material (carbon) reacts with the ceramic plate (silicon dioxide) at high temperatures (arc temperature), generating a strong endothermic reaction that absorbs a significant amount of ambient heat, significantly reducing interruption energy and thereby improving interruption capacity. The core rod can be mounted within the arc breaker, preferably directly within the gas-generating plate to facilitate the reaction. The gas-generating plate generates gas within the arc breaker, increasing internal pressure and accelerating the rate of gas discharge from the arc breaker. This also prevents back breakdown during product interruption (i.e., prevents gas discharged from the back of the arc breaker from returning). The gas-generating plate is made of a gas-generating plastic.

[0031] In this embodiment, as shown in the figure, the gas production plate is provided with a mounting groove 31, and the core rod is mounted in the mounting groove. The core rod can be mounted in the gas production plate by plug-in fitting or the like.

[0032] In this embodiment, as shown in the figure, the surface of the gas production plate is provided with a plurality of through grooves 32, which are connected to the mounting grooves to increase the contact area and facilitate the reaction.

[0033] In this embodiment, as shown in the figure, the arc quenching grid is provided with a positioning groove 21, and the gas production plate is installed in the positioning groove. The installation is relatively convenient and can be inserted, which can also increase the stability of the arc quenching grid after installation.

[0034] In this embodiment, as shown in the figure, the gas production plates are arranged in parallel in a vertical direction, and the exhaust channel is divided into at least two flow channels in the height direction. The air flow can be divided into multiple channels, which is more conducive to extinguishing.

[0035] In this embodiment, as shown in the figure, the gas production plates include a first gas production plate 34 and a second gas production plate 35, positioned opposite each other along the airflow path. A fusion zone 36 exists between the first and second gas production plates. This fusion zone allows the airflow to be split, with higher-pressure channels diverted to lower-pressure channels.

[0036] In this embodiment, as shown in the figure, the arc extinguishing chamber grid includes a main board 22, an inlet plate 23 extending outward is provided on the main board, and the positioning groove is provided on the main board.

[0037] In this embodiment, as shown in the figure, the core rod is made of ceramic.

[0038] In this embodiment, as shown in the figure, the arc extinguishing method based on the arc extinguishing chamber of a miniature circuit breaker as described above is characterized by comprising the following steps:

[0039] Step 1: When the moving contact and the static contact of the circuit breaker are disconnected, an arc and high-temperature gas are generated, and these gases and the arc enter the arc extinguishing chamber;

[0040] Step 2: The gas generating plate contacts the arc to generate gas, and the surface of the gas generating plate is carbonized by contact with the arc;

[0041] Step 3: The carbonized gas generating plate and the core rod generate an endothermic reaction, which consumes a large amount of arc energy and reduces the temperature in the arc extinguishing chamber to help extinguish the arc.

[0042] The data for this application comes from a third-party laboratory, specifically the Wenzhou Low Voltage Electrical Appliance Laboratory Yueqing Branch. The test method used is a short-circuit test, with a total of three sets of data.

[0043] The first group is the rated short-circuit capacity test Icn=10kA, which includes two test data of conventional arc extinguishing chamber and two test data of the product of the present invention;

[0044] The second group is the rated short-circuit capacity test Icn=10kA, which includes two test data of conventional arc extinguishing chamber and two test data of the product of the present invention;

[0045] The third group is the operating short-circuit capacity test Ics=6kA, which includes three test data of conventional arc extinguishing chambers and three test data of the product of the present invention; see the table below for details.

[0046]

[0047] After testing, the basis for judging whether the product is good at breaking is:

[0048] a. The product has a short on-off time (T), which is mainly determined by the product mechanism and arcing time. T = Ta + t (mechanism breaking time). The present invention mainly affects the arcing time Ta, thereby affecting this time;

[0049] b. The product has a short arcing time (Ta). The present invention can significantly affect this parameter by significantly reducing the breaking energy, thereby reducing the arcing time of the product;

[0050] Two products of the same specification (1P / C63 / AC230V) were tested using this arc extinguishing chamber and a conventional arc extinguishing chamber. Two groups (Group 1 and Group 2) had an Icn = 10kA interruption; the third group had an Ics = 6kA interruption. The arcing times Ta for Group 1 (Group #1) were 6.925ms and 6.188ms, respectively; for Group 2 (Group #1), the arcing times Ta were 5.379ms and 3.037ms, respectively. #1 used a conventional arc extinguishing chamber, while #2 used the arc extinguishing chamber of the present invention. The arcing time of the arc extinguishing chamber of the present invention was significantly reduced, by 1.546ms and 3.151ms, respectively. For data on other groups, please refer to the table above.

[0051] c. The Joule integral of the product separation is low; the present invention also has a certain impact on this.

[0052] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship 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.

[0053] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0054] The embodiments described with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. The embodiments should not be construed as limiting the present invention, but any improvements based on the spirit of the present invention should fall within the scope of protection of the present invention.

Claims

1. An arc extinguishing chamber of a miniature circuit breaker, comprising a frame, a plurality of arc extinguishing grids mounted on the frame, and an exhaust channel formed between adjacent arc extinguishing grids, characterized in that: Also includes a gas production plate, mounted in the arc extinguishing chamber, at least a portion of the gas production plate being disposed in the exhaust passage; a core rod, mounted in the arc extinguishing chamber, for generating an endothermic reaction with the gas generating plate; The endothermic reaction is a reaction between the carbonized gas generating plate and the core rod made of ceramic.

2. The arc extinguishing chamber of a miniature circuit breaker according to claim 1, characterized in that: A mounting groove is provided in the gas production plate, and the core rod is installed in the mounting groove.

3. The arc extinguishing chamber of a miniature circuit breaker according to claim 2, characterized in that: A plurality of through grooves are provided on the surface of the gas production plate, and the through grooves are communicated with the mounting grooves.

4. The arc extinguishing chamber of a miniature circuit breaker according to claim 1, characterized in that: The arc extinguishing grid is provided with a positioning groove, and the gas production plate is installed in the positioning groove.

5. The arc extinguishing chamber of a miniature circuit breaker according to claim 1, characterized in that: The gas production plates are multiple and arranged in parallel up and down, and divide the exhaust channel into at least two flow channels in the height direction.

6. The arc extinguishing chamber of a miniature circuit breaker according to claim 5, characterized in that: The gas production plate includes a first gas production plate and a second gas production plate which are arranged opposite to each other along the air flow, and a fusion zone is provided between the first gas production plate and the second gas production plate.

7. The arc extinguishing chamber of a miniature circuit breaker according to claim 4, characterized in that: The arc extinguishing chamber grid comprises a main board, an inlet plate extending outward is provided on the main board, and the positioning groove is provided on the main board.

8. The arc extinguishing chamber of a miniature circuit breaker according to any one of claims 1 to 7, characterized in that: The core rod is made of ceramic.

9. An arc extinguishing method for an arc extinguishing chamber of a miniature circuit breaker according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: When the moving contact and the static contact of the circuit breaker are disconnected, an arc and high-temperature gas are generated, and these gases and the arc enter the arc extinguishing chamber; Step 2: The gas generating plate contacts the arc to generate gas, and the surface of the gas generating plate is carbonized by contact with the arc; Step 3: The carbonized gas generating plate and the core rod generate an endothermic reaction, which consumes a large amount of arc energy and reduces the temperature in the arc extinguishing chamber to help extinguish the arc.

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