Circuit breaker arc extinguishing system

Abstract

The invention discloses an arc extinguishing system of a circuit breaker. A shell is provided with an accommodating cavity; the static contact is accommodated in the accommodating cavity, the static contact comprises a wiring end and a static contact point, the static contact point is higher than the wiring end, and the static contact point is matched with the moving contact; the arc extinguish chamber is accommodated in the accommodating cavity, the arc extinguish chamber is provided with a plurality of arc extinguish grid sheets, and the lower end of the arc extinguish chamber is lower than the wiring terminal; one end of the arc striking angle is connected with the static contact, and the other end of the arc striking angle extends to the lowest end of the arc extinguish chamber; the arc striking angle is provided with an arc striking runway, the arc striking runway comprises a first inclined plane and a first plane, the first inclined plane is connected with the first plane, and the first plane extends to the lowest end of the arc extinguish chamber; under the condition that the opening distance of the circuit breaker is not changed, the electric arc column is lengthened in a longitudinal and transverse magnetic blow-out mode, the cathode electric arc can be transferred more quickly, the electric arc is quickly introduced into the arc extinguish chamber in combination with air blowing, the capacity of the arc extinguish chamber is increased, and a plurality of arc extinguish grid plates can be stacked in the arc extinguish chamber to improve the arc extinguish effect, so that the breaking capacity of the circuit breaker is improved.

Description

Technical Field

[0001] The present invention relates to the field of electrical technology, and in particular to an arc extinguishing system for a circuit breaker. Background Art

[0002] A low-voltage molded case circuit breaker (MCCB) is a protective electrical device. When a short circuit occurs, the MCCB trips, interrupting the fault current. When a short circuit occurs, the MCCB's current tripper activates, unlocking the MCCB's operating mechanism. Once unlocked, the mechanism separates the moving and stationary contacts via a connecting rod, thereby interrupting the fault current. After the moving and stationary contacts separate, a high-temperature arc is generated between the moving and stationary contacts. Existing methods use methods such as magnetic blowing and air blowing to blow the high-temperature arc into the arc extinguishing chamber. The arc is then divided and cooled by metal arc-extinguishing grids in the arc extinguishing chamber until it is extinguished.

[0003] However, when the operating voltage is higher, existing low-voltage molded case circuit breakers cannot meet arc extinguishing requirements, such as a small spacing between the moving and static contacts and insufficient arc extinguishing grid capacity. Changing the spacing between the moving and static contacts increases the length of the entire molded case circuit breaker, affecting practical installation. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is how to change the existing structure and improve the arc extinguishing effect when the opening distance between the moving and static contacts is constant. A circuit breaker arc extinguishing system includes:

[0005] A housing, wherein the housing is provided with a receiving cavity;

[0006] A static contact, the static contact being accommodated in the accommodating cavity, the static contact comprising a terminal and a static contact point, the static contact point being higher than the terminal, and the static contact point being matched with the moving contact;

[0007] An arc extinguishing chamber, the arc extinguishing chamber being accommodated in the accommodating cavity, the arc extinguishing chamber being provided with a plurality of arc extinguishing grids, and the lower end of the arc extinguishing chamber being lower than the wiring terminal;

[0008] An arc striking angle, one end of which is connected to the static contact, and the other end of which extends to the lowest end of the arc extinguishing chamber; the arc striking angle is provided with an arc striking runway, and the arc striking runway includes a first inclined surface and a first plane, the first inclined surface is connected to the first plane, and the first plane extends to the lowest end of the arc extinguishing chamber.

[0009] The arc striking angle is provided with a chamber, in which a magnet is fixed. The magnet includes a second inclined surface and a second plane. The second inclined surface is connected to the second plane. The second inclined surface is parallel to the first inclined surface, and the second plane is parallel to the first plane.

[0010] The arc striking angle is provided with an arc striking end, the arc striking end is against the static contact, and the top surface of the arc striking end is coplanar with the top surface of the static contact.

[0011] Both sides of the chamber are open.

[0012] The accommodating cavity is provided with a support column, the static contact is provided with a first through hole and a first horizontal portion, the first through hole is sleeved on the support column, and the static contact is arranged above the first horizontal portion; the arc-striking angle is provided with an upper arc-striking portion and a lower arc-striking portion, one end of the upper arc-striking portion is connected to the static contact, the other end of the upper arc-striking portion is connected to one end of the lower arc-striking portion, and the other end of the lower arc-striking portion extends between the first horizontal portion and the support column.

[0013] A bolt passes through the support column, the lower arc-guiding portion and is connected to the first horizontal portion.

[0014] The arc extinguishing chamber is fixed with a gas generating block, the number of the gas generating blocks is two, and the two gas generating blocks form a trumpet-shaped structure.

[0015] The arc extinguishing chamber includes a first arc extinguishing zone and a second arc extinguishing zone. The connection between the first arc extinguishing zone and the second arc extinguishing zone is located in the horizontal extension direction of the top surface of the static contact. The gas generating block is arranged in the second arc extinguishing zone.

[0016] It also includes a first contact cover and a second contact cover, and the static contact also includes a first connecting portion, a first longitudinal portion and a second longitudinal portion, one end of the first connecting portion is connected to the terminal through the first longitudinal portion, and the other end of the first connecting portion is connected to the first horizontal portion through the second longitudinal portion; the first contact cover covers the first connecting portion and the first longitudinal portion; the second contact cover covers the first horizontal portion, and the static contact is exposed on the outside of the second contact cover.

[0017] The first contact cover is provided with a positioning block, and the positioning block abuts against a side surface of the first connecting portion.

[0018] The technical solution of the present invention has the following advantages:

[0019] 1. The present invention provides an arc extinguishing system for a circuit breaker. Since it is necessary to ensure a constant opening distance between a moving contact and a static contact, in order to increase the volume of the arc extinguishing chamber, the height of the shell can only be increased. After the height is increased, the height difference between the terminal and the static contact is set to achieve a constant opening distance between the moving contact and the static contact. Similarly, the arc extinguishing chamber extends downward to increase the volume of the arc extinguishing chamber, thereby improving the overall arc extinguishing effect. Secondly, the setting of the arc striking angle forms a guided arc striking effect, so that the arc can quickly enter the arc extinguishing chamber, and finally achieve an arc extinguishing effect. Even in a high-voltage working environment, the volume of the arc extinguishing chamber is increased, the arc extinguishing level is improved, and the arc extinguishing chamber can also form an arc extinguishing effect for high-voltage arcs.

[0020] 2. The present invention provides a circuit breaker arc extinguishing system, in which the arrangement of magnets forms a magnetic field, and a uniform strong magnetic field can be achieved on the entire arc striking runway for arc striking, and the magnetic field has the effect of arc striking and arc blowing. Moreover, the first inclined surface enables the magnetic field to perform longitudinal and transverse magnetic blowing on the arc, so that when the arc enters the arc extinguishing chamber, the arc column is lengthened and thinned, which is more conducive to the extinction of the arc.

[0021] 3. The circuit breaker arc extinguishing system provided by the present invention has a coplanar arrangement that facilitates the rapid transfer of the cathode arc (which cannot jump). Moreover, the structure does not require welding, making assembly simple and reliable.

[0022] 4. The present invention provides a circuit breaker arc extinguishing system, and this structural arrangement facilitates the installation of the magnet.

[0023] 5. The present invention provides an arc extinguishing system for a circuit breaker, in which the arc striking angle is connected and fixed to the support column and the static contact through the end of the lower arc striking part, and the arc striking angle is connected to the static contact through the end of the upper arc striking part, forming a connection and fixing effect of the arc striking angle as a whole, and the support column also plays a certain isolation and arc extinguishing effect.

[0024] 6. The circuit breaker arc extinguishing system provided by the present invention is fixed by bolts, so that the arc striking angle is fixed more firmly and stably.

[0025] 7. The present invention provides a circuit breaker arc extinguishing system, in which a gas generating block is set. When the electric arc contacts the gas generating block, the gas generating block will generate gas, and the gas forms an air blowing effect, which can blow the arc into the arc extinguishing chamber. Moreover, the setting of the trumpet-shaped structure has a guiding effect, making it easier for the arc to enter the arc extinguishing chamber.

[0026] 8. The present invention provides an arc extinguishing system for a circuit breaker. The setting of two arc extinguishing zones improves the arc extinguishing effect. The second arc extinguishing zone is located below the static contact, forming a diversion and shunting effect of the arc, avoiding most of the arc from gathering in the first arc extinguishing zone, further improving the arc extinguishing effect. In addition, technical personnel in this field can extend the arc striking angle and the length of the shell, increase the height of the second arc extinguishing zone, and improve the arc extinguishing effect.

[0027] 9. In the circuit breaker arc extinguishing system provided by the present invention, the first contact cover and the second contact cover have a protective effect to prevent the arc from burning the rest of the static contact (other positions except the static contact point).

[0028] 10. In the arc extinguishing system of a circuit breaker provided by the present invention, the provision of the positioning block makes the installation and positioning of the first contact cover more convenient, and allows for rapid assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 A schematic structural diagram of a circuit breaker arc extinguishing system provided by the present invention;

[0031] Figure 2 A cross-sectional view of a circuit breaker arc extinguishing system provided by the present invention;

[0032] Figure 3 for Figure 2 A partial enlarged view of

[0033] Figure 4 A schematic structural diagram of the arc extinguishing chamber provided by the present invention;

[0034] Figure 5 A bottom view of the arc extinguishing chamber provided by the present invention;

[0035] Figure 6 This is a schematic diagram of the structure of the arc striking angle and the magnet provided by the present invention;

[0036] Figure 7 A schematic structural diagram of the static contact provided by the present invention;

[0037] Figure 8 This is a schematic structural diagram of the first contact cover provided by the present invention.

[0038] Description of reference numerals:

[0039] 11. Housing; 12. Stationary contact; 13. Moving contact; 14. Arc extinguishing chamber; 15. Arc striking angle; 16. Magnet; 17. Base; 18. Gas generating block; 19. First contact cover; 20. Second contact cover; 21. Baffle; 22. Arc extinguishing chamber; 111. Accommodating cavity; 112. Support column; 121. Terminal; 122. Stationary contact; 123. First through hole; 124. First horizontal portion; 125. First connecting portion; 126. First longitudinal portion; 127, second longitudinal portion; 131, moving contact; 141, arc extinguishing grid; 142, first arc extinguishing zone; 143, second arc extinguishing zone; 144, arc striking plate; 151, arc striking runway; 152, chamber; 153, arc striking end; 154, upper arc striking portion; 155, lower arc striking portion; 161, second inclined surface; 162, second plane; 191, positioning block; 1511, first inclined surface; 1512, first plane. DETAILED DESCRIPTION

[0040] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0041] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] 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, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0043] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0044] Example 1

[0045] This embodiment provides a circuit breaker arc extinguishing system, as shown in the attached Figures 1-8 Shown, including:

[0046] The housing 11 is provided with a receiving cavity 111 .

[0047] The static contact 12 is accommodated in the accommodating cavity 111. The static contact 12 includes a terminal 121 and a static contact 122. The terminal 121 is fixedly connected to the housing 11. Here, the terminal 121 is partially located inside the accommodating cavity 111, and the terminal 121 partially extends outside the accommodating cavity 111. Here, the terminal 121 is used to form an electrical connection with an external circuit. The static contact 122 is used to cooperate with the moving contact 13. The operating mechanism inside the circuit breaker drives the moving contact 13 to rotate, so that the moving contact 131 on the moving contact 13 and the static contact 122 are against each other, forming an electrical connection effect between the two, that is, the closed state; conversely, when the operating mechanism rotates in the opposite direction, it drives the moving contact 13 to rotate in the opposite direction, so that the moving contact 131 and the static contact 122 are separated, forming a disconnection effect between the two, that is, the open state. It should be noted that in this embodiment, the opening distance between the moving contact 131 and the static contact 122 is equal to the opening distance between the moving contact 131 and the static contact 122 in the prior art. When the opening distance remains unchanged, the overall length of the shell 11 and the operating mechanism and other structures do not need to be changed, avoiding the increase in the models and types of parts caused by the modification, thus achieving the commonality between the parts of the low-voltage molded case circuit breaker and the parts of the medium and high-voltage molded case circuit breaker, which can indirectly reduce the production cost; and the increase in the length of the shell 11 will affect the installation of other electrical products. The increase in length will lead to an increase in the installation area, such as the layout and wiring in the entire distribution box. In this embodiment, the height of the shell 11 is greater than the height of the shell 11 in the prior art, and the increase in height will not have a large-scale impact on the installation of other electrical products.

[0048] The static contact 122 is higher than the terminal 121. The height here specifically refers to the height from the static contact 122 to the bottom surface of the housing 11, and the height from the terminal 121 to the bottom surface of the housing 11. When projected from the side, the height of the static contact 122 is higher than the height of the terminal 121. Furthermore, this means that the bottom surface of the static contact 122 is higher than the top surface of the terminal 121. The height difference can be adjusted based on actual needs. In other words, when the voltage in the circuit breaker's operating environment is higher, the height difference between the static contact 122 and the terminal 121 is greater, which can accommodate more arc-extinguishing grids, improving the arc-extinguishing effect. Similarly, the height of the entire housing 11 is also higher.

[0049] The arc-extinguishing chamber 14 is housed in the accommodating cavity 111. The moving contact 13 and the static contact 122 are located on the left side of the arc-extinguishing chamber 14, and the terminal 121 is located on the right side of the arc-extinguishing chamber 14. The arc-extinguishing chamber 14 is provided with a plurality of arc-extinguishing grids 141. The number of arc-extinguishing grids 141 can be adjusted according to actual needs. Similarly, the structure and layout of the arc-extinguishing grids 141 can also be adjusted based on arc-extinguishing grids 141 in the prior art. The lower end of the arc-extinguishing chamber 14 is lower than the terminal 121, and the upper end of the arc-extinguishing chamber 14 is beyond the maximum travel of the moving contact 13. That is, in the open state, when the moving contact 131 is at its highest point, the moving contact 131 is still located within the arc-extinguishing chamber 14.

[0050] The arc striking angle 15 has one end connected to the static contact 12. This connection specifically refers to an electrical connection. When an arc is generated between the moving contact 131 and the static contact 122, the arc can be struck through the arc striking angle 15. Specifically, the arc striking angle 15 forms an electrical connection with the static contact 122. The other end of the arc striking angle 15 extends to the lowest end of the arc extinguishing chamber 14 and is located below the arc extinguishing grid 141 at the lowest end of the arc extinguishing chamber 14. The arc striking angle 15 is provided with an arc striking track 151. The arc striking track 151 includes a first inclined surface 1511 and a first flat surface 1512. The first inclined surface 1511 is connected to the first flat surface 1512. The first flat surface 1512 extends to the lowest end of the arc extinguishing chamber 14. Since it is necessary to ensure that the opening distance between the moving contact 13 and the static contact 12 is constant, in order to increase the volume of the arc extinguishing chamber 14, the height of the shell 11 can only be increased. After the height is increased, the height difference between the terminal 121 and the static contact 122 is set to achieve the effect of constant opening distance between the moving contact 13 and the static contact 12. Similarly, the arc extinguishing chamber 14 extends downward to increase the volume of the arc extinguishing chamber 14, thereby improving the overall arc extinguishing effect; secondly, the setting of the arc striking angle 15 forms a guiding arc striking effect, so that the arc can quickly enter the arc extinguishing chamber 14, and finally achieve the arc extinguishing effect. Even in a high-voltage working environment, the volume of the arc extinguishing chamber 14 is increased, the arc extinguishing level is improved, and the arc extinguishing chamber 14 can also form an arc extinguishing effect for high-voltage arcs.

[0051] Specifically, as attached Figure 2-Figure 3 、 Figure 6As shown, the arc striking angle 15 is provided with a chamber 152, within which a magnet 16 is fixed. Magnet 16 is connected and fixed to the arc striking angle 15. Specifically, because the arc striking angle 15 is made of a conductive metal material, magnet 16 is magnetic and is attracted to the arc striking angle 15. Magnet 16 includes a second inclined surface 161 and a second flat surface 162, and is approximately L-shaped. Second inclined surface 161 is connected to second flat surface 162, and second inclined surface 161 is parallel to first inclined surface 1511, while second flat surface 162 is parallel to first flat surface 1512. The arrangement of magnet 16 forms a magnetic field, achieving a uniform, strong magnetic field for arc striking throughout the entire arc striking track 151, both for arc striking and arc blowing. Furthermore, first inclined surface 1511 enables the magnetic field to magnetically blow the arc longitudinally and transversely, so that when the arc enters the arc extinguishing chamber 14, the arc column is lengthened and thinned, which facilitates arc extinguishing. Magnet 16 is close to the cathode arc on the arc striking track 151. Specifically, the magnetic field generated by the second inclined surface 161 creates a force decomposition that allows the magnetic field to magnetically blow the arc both longitudinally and transversely. Furthermore, the arc striking angle 15 is a monolithic structure, meaning that the arc striking angle 15 lacks a cavity 152. Magnet 16 is directly attached to the side of the arc striking angle 15 away from the moving contact 13.

[0052] Specifically, as attached Figure 2-Figure 3 、 Figure 6 As shown, the arc-striking angle 15 is provided with an arc-striking end 153, which abuts against the static contact 122. Here, the arc-striking end 153 is the end connected to the static contact 122, that is, the electrical connection between the arc-striking angle 15 and the static contact 122 is achieved. In this embodiment, the left side of the arc-striking end 153 abuts against the right side of the static contact 122, and the top surface of the arc-striking end 153 is coplanar with the top surface of the static contact 122. This coplanar arrangement facilitates the rapid transfer of the cathode arc (which cannot jump). Furthermore, this structure does not require welding, making assembly simple and reliable.

[0053] Specifically, as attached Figure 2-Figure 3 、 Figure 6 As shown, there is interference fit between the arc striking end 153 and the static contact 122, that is, the arc striking end 153 of the arc striking angle 15 and the static contact 122 are offset by the elasticity of the arc striking angle 15, forming an interference fit effect, so that the connection stability between the arc striking angle 15 and the static contact 122 is improved.

[0054] Specifically, as attached Figure 2-Figure 3 、 Figure 6 As shown, both sides of the chamber 152 are open. This structural arrangement facilitates the installation of the magnet 16. In this embodiment, the chamber 152 is specifically open at both the front and rear sides to facilitate the installation of the magnet 16, that is, the magnet 16 is installed into the chamber 152 from the side.

[0055] Specifically, as attached Figure 2-Figure 3 、 Figure 6 As shown, the accommodating cavity 111 is provided with a support column 112, and the static contact 12 is provided with a first through-hole 123 and a first horizontal portion 124. The first through-hole 123 is sleeved on the support column 112, and the first through-hole 123 forms a sleeved and fixed effect for the static contact 12. The static contact 122 is provided above the first horizontal portion 124. Here, the static contact 122 and the first horizontal portion 124 are an integral structure. For example, the static contact 122 is connected to the first horizontal portion 124 by riveting or welding. Here, the static contact 122 is specifically a silver contact. The arc-striking angle 15 is provided with an upper arc-striking portion 154 and a lower arc-striking portion 155. The upper arc-striking portion 154 and the lower arc-striking portion 155 are connected to form a chamber 152. The upper arc-striking portion 154 and the lower arc-striking portion 155 are both sheet-like structures. The two are connected to form a front and rear opening and a left opening. When the upper arc-striking portion 154 abuts the static contact 122 and the lower arc-striking portion 155 extends between the first horizontal portion 124 and the support column 112, the left opening is closed. The arc-striking end 153 is provided on the upper arc-striking portion 154, thus forming a connection between one end of the upper arc-striking portion 154 and the static contact 122. The other end of the upper arc-striking portion 154 is connected to one end of the lower arc-striking portion 155, and the other end of the lower arc-striking portion 155 extends between the first horizontal portion 124 and the support column 112. The arc-striking angle 15 is connected and fixed to the support column 112 and the static contact 12 via the end of the lower arc-striking portion 155. The arc-striking angle 15 is connected to the static contact 122 via the end of the upper arc-striking portion 154, forming a connection and fixation effect for the entire arc-striking angle 15. The support column 112 also has a certain isolation and arc extinguishing effect. In addition, it should be noted that the arc-striking runway 151 is provided on the upper arc-striking portion 154. The lower arc-striking portion 155 is also provided with a structure parallel to the arc-striking runway 151, thereby achieving a fixing effect on the magnet 16. In this embodiment, the lower arc-striking portion 155 not only has an arc-striking effect, but also provides a fixing effect for the entire arc-striking angle 15.

[0056] Specifically, as attached Figure 2-Figure 3 、 Figure 6 As shown, one end where the upper arc-striking portion 154 and the lower arc-striking portion 155 are connected (the right end of the upper arc-striking portion 154 and the right end of the lower arc-striking portion 155) form an arc-striking angle 15 that extends to one end of the arc extinguishing chamber 14, and the left end of the upper arc-striking portion 154 and the left end of the lower arc-striking portion 155 form an end where the arc-striking angle 15 is electrically connected to the static contact 12.

[0057] Specifically, as attached Figure 2-Figure 3 、 Figure 6As shown, the bolt passes through the support column 112, the lower arc-starting portion 155 and is connected to the first horizontal portion 124. Fixing by bolts makes the arc-starting angle 15 more firmly and stably fixed. In this embodiment, the housing 11 includes a base 17, and the support column 112 is arranged on the base 17. The bolts are inserted from below the bottom surface of the base 17, and the bolts pass through the support column 112, the lower arc-starting portion 155 and are connected to the first horizontal portion 124, forming a connection and fixing effect between the several. It should also be noted that the bolts will not exceed the top surface of the first horizontal portion 124. At this time, the lower arc-starting portion 155 and the end of the support column 112 cooperate to form a clamping and fixing effect, giving the arc-starting angle 15 as a whole a fixing force. At the same time, the arc-starting end 153 is abutted by the static contact 122, and the two cooperate with each other to form the fixation of the arc-starting angle 15 as a whole. This structure is simple to assemble and does not require welding, which reduces the difficulty of assembly and installation cost. In addition, the left end of the upper arc-starting portion 154 and the left end of the lower arc-starting portion 155 are staggered, further improving the fixing effect. For example, when the arc striking angle 15 is made of iron, the arc striking angle 15 itself has a certain strength, which can better achieve the fixing effect. Even if the magnet 16 is installed and fixed, the arc striking end 153 will not be separated from the static contact 122 by the gravity of the magnet 16. In other words, the arc striking angle 15 will not be greatly deformed by the gravity of the magnet 16 under the action of its own strength. The gravity of the magnet 16 has a negligible effect on the arc striking angle 15.

[0058] Specifically, the arc ignition angle 15 is short-circuited to the static contact 12. When the circuit breaker is operating normally, the arc ignition angle 15 is short-circuited, and no current flows through the arc ignition angle 15, nor does it affect the entire electrical circuit, thereby increasing the service life of the arc ignition angle 15. The arc ignition angle 15 only plays an arc-ignition role during the breaking process.

[0059] Specifically, as attached Figure 2-Figure 3 As shown, the static contact 122 is higher than the terminal 121, and the specific height difference between the two is at least 10 mm. The height difference here specifically refers to the vertical height between the bottom surface of the static contact 122 and the top surface of the terminal 121. The height difference can also be considered as the distance from the bottom surface of the static contact 122 to the bottom surface of the shell 11 minus the distance from the top surface of the terminal 121 to the bottom surface of the shell 11. When the voltage level of the entire circuit breaker is increased, those skilled in the art can increase the height of the shell 11, which means that it is necessary to increase the length of the arc striking angle 15 and the height of the arc extinguishing chamber 14, so that the capacity of the arc extinguishing chamber 14 is larger, and the arc extinguishing effect can be better achieved. Those skilled in the art can adjust the overall height according to actual needs, and for circuit breakers of different specifications, many internal components of the circuit breaker are universal parts. Only the arc striking angle 15, the arc extinguishing chamber 14, and the static contact 12 need to be replaced, thereby reducing production costs.

[0060] Specifically, in this embodiment, the arc-striking angle 15 is made of a metal conductive material, such as iron, copper, etc. The arc-striking angle 15 is formed by bending. The magnet 16 can be a magnet, etc. Since the magnet 16 itself has magnetism, when the magnet 16 is located in the chamber 152, it can have an adsorption effect. The magnet 16 can be attached to the upper arc-striking portion 154, the magnet 16 can also be attached to the lower arc-striking portion 155, and the magnet 16 can also be attached to the upper arc-striking portion 154 and the lower arc-striking portion 155 on both sides to form a clamping and fixing effect.

[0061] Specifically, as attached Figure 2-Figure 5 As shown, the arc extinguishing chamber 14 is fixed with a gas-producing block 18, and the number of gas-producing blocks 18 is two. The two gas-producing blocks 18 form a trumpet-shaped structure. The two gas-producing blocks 18 are symmetrically arranged, and the two form a trumpet-shaped structure, that is, the size of the end close to the moving contact 13 is small, and the size of the end away from the moving contact 13 is large, forming a guiding effect. The arrangement of the gas-producing block 18, when the arc contacts the gas-producing block 18, the gas-producing block 18 will produce gas, and the gas will form a gas blowing effect, which can blow the arc into the arc extinguishing chamber 14, and the arrangement of the trumpet-shaped structure has a guiding effect, making it easier for the arc to enter the arc extinguishing chamber 14. In this embodiment, the gas-producing block 18 is made of a gas-producing material. The gas-producing block 18 can be connected and fixed to the side plate of the arc extinguishing chamber 14 by bolts. It should also be noted that the two sides of the arc extinguishing grid 141 are respectively connected to the two gas-producing blocks 18, forming a plug-in fixing effect.

[0062] Specifically, as attached Figure 2-Figure 3 As shown, the arc extinguishing chamber 14 includes a first arc extinguishing zone 142 and a second arc extinguishing zone 143. The connection between the first arc extinguishing zone 142 and the second arc extinguishing zone 143 is located in the horizontal extension direction of the top surface of the static contact 122, and the gas generating block 18 is provided in the second arc extinguishing zone 143. The provision of two arc extinguishing zones improves the arc extinguishing effect. Moreover, the second arc extinguishing zone 143 is located below the static contact 122, forming a diversion and diversion effect of the arc, preventing most of the arc from gathering in the first arc extinguishing zone 142, further improving the arc extinguishing effect. In addition, those skilled in the art can extend the arc striking angle 15 and the length of the housing 11, increase the height of the second arc extinguishing zone 143, and improve the arc extinguishing effect. Here, the gas generating block 18 can also extend to the first arc extinguishing zone 142 to improve the arc extinguishing effect of the first arc extinguishing zone 142.

[0063] Specifically, as attached Figure 2-Figure 5 As shown, the arc extinguishing chamber 14 is also fixed with an arc striking piece 144, which is located at the top of all the arc extinguishing grids 141. The arc striking piece 144 is used to cooperate with the moving contact 13 so that the arc remaining on the moving contact 13 enters the arc extinguishing chamber 14 through the arc striking piece 144.

[0064] Specifically, as attached Figure 2-Figure 3As shown, the housing 11 further includes a first contact cover 19 and a second contact cover 20. The static contact 12 also includes a first connecting portion 125, a first longitudinal portion 126, and a second longitudinal portion 127. One end of the first connecting portion 125 is connected to the terminal 121 via the first longitudinal portion 126, and the other end of the first connecting portion 125 is connected to the first horizontal portion 124 via the second longitudinal portion 127. The first contact cover 19 covers the first connecting portion 125 and the first longitudinal portion 126; the second contact cover 20 covers the first horizontal portion 124, leaving the static contact 122 exposed outside the second contact cover 20. The first and second contact covers 19 and 20 provide protection, preventing arcing from burning the rest of the static contact 12 (other than the static contact 122). In this embodiment, the static contact 12 is integrally formed. When the overall height of the housing 11 needs to be adjusted, only the height of the second longitudinal portion 127 needs to be adjusted. First through-hole 123 is provided in first connecting portion 125. Second longitudinal portion 127 is located to the left of support column 112. First horizontal portion 124 extends horizontally toward terminal 121. Support column 112 also provides isolation and protection, protecting second longitudinal portion 127 from burns. The first contact cover 19, second contact cover 20, and support column 112 work together to protect static contact 12, preventing the remaining portion of static contact 12 from being burned by the arc.

[0065] Specifically, as attached Figure 8 As shown, the first contact cover 19 is provided with a positioning block 191, which abuts against the side surface of the first connecting portion 125. The provision of the positioning block 191 makes it easier to install and position the first contact cover 19, allowing for quick assembly.

[0066] Specifically, the shell 11 can also be provided with a baffle 21, which is fixed to the base 17 in a plug-in manner, and the lower end of the baffle 21 is against the terminal 121. At this time, the baffle 21, the first contact cover 19, the second contact cover 20, and the support column 112 cooperate to form a protective effect to prevent the arc from escaping from the arc extinguishing chamber 14 to the outside.

[0067] Specifically, the arc extinguishing chamber 22 is located outside the terminal 121, providing external arc protection. Arc extinguishing components are fixed to the arc extinguishing chamber 22. Arc extinguishing chamber 22 is connected to the arc extinguishing chamber 14. When the arc enters the arc extinguishing chamber 14, it is extinguished. Free electrons are also generated and extinguished by the arc extinguishing chamber 22.

[0068] Specifically, when the opening distance of the circuit breaker remains unchanged, the arc column is lengthened by longitudinal and transverse magnetic blowing, and the cathode arc can be transferred faster. Combined with air blowing, the arc is quickly introduced into the arc extinguishing chamber. The capacity of the arc extinguishing chamber 14 is increased, and the arc extinguishing chamber can stack multiple arc extinguishing grids to increase the arc extinguishing effect, thereby improving the breaking capacity of the circuit breaker.

[0069] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A circuit breaker arc extinguishing system, characterized in that: include: A housing (11), wherein the housing (11) is provided with a receiving cavity (111); A static contact (12), the static contact (12) being accommodated in the accommodating cavity (111), the static contact (12) comprising a terminal (121) and a static contact point (122), the static contact point (122) being higher than the terminal (121), and the static contact point (122) being matched with the moving contact (13); An arc extinguishing chamber (14), the arc extinguishing chamber (14) being accommodated in the accommodating cavity (111), the arc extinguishing chamber (14) being provided with a plurality of arc extinguishing grids (141), and the lower end of the arc extinguishing chamber (14) being lower than the connection terminal (121); An arc striking angle (15), one end of the arc striking angle (15) is connected to the static contact (12), and the other end of the arc striking angle (15) extends to the lowest end of the arc extinguishing chamber (14); the arc striking angle (15) is provided with an arc striking runway (151), and the arc striking runway (151) includes a first inclined surface (1511) and a first plane (1512), the first inclined surface (1511) is connected to the first plane (1512), and the first plane (1512) extends to the lowest end of the arc extinguishing chamber (14).

2. The circuit breaker arc extinguishing system according to claim 1, characterized in that: The arc striking angle (15) is provided with a chamber (152), a magnet (16) is fixed in the chamber (152), the magnet (16) includes a second inclined surface (161) and a second plane (162), the second inclined surface (161) is connected to the second plane (162), the second inclined surface (161) is parallel to the first inclined surface (1511), and the second plane (162) is parallel to the first plane (1512).

3. The circuit breaker arc extinguishing system according to claim 2, characterized in that: The arc striking angle (15) is provided with an arc striking end (153), the arc striking end (153) abuts against the static contact (122), and the top surface of the arc striking end (153) is coplanar with the top surface of the static contact (122).

4. The circuit breaker arc extinguishing system according to claim 2, characterized in that: Both sides of the chamber (152) are open.

5. The circuit breaker arc extinguishing system according to claim 1, characterized in that: The accommodating cavity (111) is provided with a support column (112), the static contact (12) is provided with a first through hole (123) and a first horizontal portion (124), the first through hole (123) is sleeved on the support column (112), and the static contact (122) is arranged above the first horizontal portion (124); the arc-striking angle (15) is provided with an upper arc-striking portion (154) and a lower arc-striking portion (155), one end of the upper arc-striking portion (154) is connected to the static contact (122), the other end of the upper arc-striking portion (154) is connected to one end of the lower arc-striking portion (155), and the other end of the lower arc-striking portion (155) extends between the first horizontal portion (124) and the support column (112).

6. The circuit breaker arc extinguishing system according to claim 5, characterized in that: A bolt passes through the support column (112), the lower arc-initiating portion (155), and is connected to the first horizontal portion (124).

7. The circuit breaker arc extinguishing system according to claim 1, characterized in that: The arc extinguishing chamber (14) is fixed with a gas generating block (18), the number of the gas generating blocks (18) is two, and the two gas generating blocks (18) form a trumpet-shaped structure.

8. The circuit breaker arc extinguishing system according to claim 7, characterized in that: The arc extinguishing chamber (14) includes a first arc extinguishing zone (142) and a second arc extinguishing zone (143), wherein the connection between the first arc extinguishing zone (142) and the second arc extinguishing zone (143) is located in the horizontal extension direction of the top surface of the static contact (122), and the gas generating block (18) is arranged in the second arc extinguishing zone (143).

9. The circuit breaker arc extinguishing system according to claim 1, characterized in that: The invention also includes a first contact cover (19) and a second contact cover (20), and the static contact (12) also includes a first connecting portion (125), a first longitudinal portion (126) and a second longitudinal portion (127), one end of the first connecting portion (125) is connected to the terminal (121) through the first longitudinal portion (126), and the other end of the first connecting portion (125) is connected to the first horizontal portion (124) through the second longitudinal portion (127); the first contact cover (19) covers the first connecting portion (125) and the first longitudinal portion (126); the second contact cover (20) covers the first horizontal portion (124), and the static contact point (122) is exposed outside the second contact cover (20).

10. The circuit breaker arc extinguishing system according to claim 9, characterized in that: The first contact cover (19) is provided with a positioning block (191), and the positioning block (191) abuts against a side surface of the first connecting portion (125).

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