Switching appliances

Abstract

An arc extinguishing chamber and a switch, wherein the arc extinguishing chamber housing of the arc extinguishing chamber is divided into two cavities by a partition plate, and a plurality of arc extinguishing grids are arranged in each cavity to form two arc extinguishing cavities, and a single-pole double-cavity arc extinguishing chamber is formed by adding an isolated arc extinguishing chamber, which is respectively used to cooperate with two breaking points of a single-pole moving and static contact to form a single-pole double-cavity arc extinguishing chamber, thereby improving the high-voltage breaking and arc extinguishing capability of the circuit breaker. The switch comprises at least one arc extinguishing chamber of the present invention.

Description

Technical Field

[0001] The invention relates to the field of low-voltage electrical appliances, in particular to a switch electrical appliance. Background Art

[0002] A DC circuit breaker is a switch device that can carry and interrupt current under normal circuit conditions, and can also carry and interrupt current under abnormal circuit conditions within a specified time. The function of the circuit breaker to interrupt overload or short-circuit current is mainly realized in the arc extinguishing chamber in the circuit breaker. When a fault current appears in the circuit and the current value exceeds the set protection range of the circuit breaker, the tripping mechanism operates to quickly disconnect the moving and static contacts of the circuit breaker. At this time, the voltage formed between the moving and static contacts will cause the air medium to discharge, thereby generating a high-temperature arc. During the burning process of the arc, the air temperature in the arc extinguishing device will rise sharply, thereby accelerating the ionization of the air. On the other hand, the arc is driven by the magnetic field and fluid effect in the arc extinguishing chamber, and is divided into multiple short arcs by multiple arc-isolating grids. The arc is gradually reduced by the metal arc-isolating grids to strengthen the deionization effect of the arc until it is extinguished.

[0003] However, the current arc extinguishing methods can only solve the arcs generated by low voltage. For arcs generated by high voltage, the arc extinguishing ability of the single-pole single-chamber is slightly insufficient.

[0004] In addition, the traditional single-pole single-break point contact mechanism can only meet the breaking requirements under a certain working voltage. When the working voltage is very high, the traditional single-pole single-break point contact mechanism cannot meet the breaking requirements. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects of the prior art and provide an arc extinguishing chamber with high voltage breaking arc extinguishing capability, wherein an isolated arc extinguishing chamber is added to the single-pole arc extinguishing chamber to form a single-pole double-chamber arc extinguishing chamber. The present invention also provides a switch electrical appliance including the arc extinguishing chamber.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A switching device comprises a contact system and an arc extinguishing system, wherein the arc extinguishing system comprises at least one arc extinguishing chamber, wherein the arc extinguishing chamber cooperates with a contact mechanism of the contact system, wherein the contact mechanism is a single-pole double-breakpoint contact mechanism, wherein the arc extinguishing chamber housing of the arc extinguishing chamber is divided into two cavities by a partition plate, wherein each cavity is provided with a plurality of arc extinguishing grids which are spaced and stacked to form two arc extinguishing cavities, wherein the contact mechanism is a single-pole double-breakpoint contact mechanism, comprising a moving contact provided with two moving contacts, and a stationary contact provided with two stationary contacts, wherein the two moving contacts of the moving contact respectively extend into the two arc extinguishing cavities of the arc extinguishing chamber to cooperate with the two stationary contacts.

[0008] Preferably, at least one permanent magnet is provided on both sides of each arc extinguishing chamber.

[0009] Preferably, permanent magnets are respectively provided at the top of the arc extinguishing chamber housing at positions corresponding to each arc extinguishing cavity.

[0010] Preferably, the magnetic pole direction of the permanent magnet at the top of one arc extinguishing chamber is opposite to the magnetic pole direction of the permanent magnet at the top of another arc extinguishing chamber.

[0011] Preferably, the permanent magnets on both sides of the two arc extinguishing cavities are divided into two groups, the polarity directions of the permanent magnets in each group are respectively N and S arranged in the same direction, and the direction of the electromagnetic force points to the arc extinguishing grid in the corresponding arc extinguishing cavity.

[0012] Preferably, the multiple stacked arc-extinguishing grids in each arc-extinguishing cavity form an arc-extinguishing grid group, and each arc-extinguishing grid group includes arc-extinguishing grids of multiple sizes, and the arc-extinguishing grids are made of non-magnetic conductive materials.

[0013] Preferably, each arc-extinguishing grid group includes a first arc-extinguishing grid, a second arc-extinguishing grid, a third arc-extinguishing grid, and a fourth arc-extinguishing grid of different sizes, and each arc-extinguishing grid group is stacked from top to bottom in sequence: at least one first arc-extinguishing grid, at least one third arc-extinguishing grid, at least one second arc-extinguishing grid, multiple third arc-extinguishing grids, at least one second arc-extinguishing grid, at least one third arc-extinguishing grid, and at least one fourth arc-extinguishing grid, the thickness of the fourth arc-extinguishing grid is greater than that of other arc-extinguishing grids, a downwardly bent arc-striking lug is provided in the arc-extinguishing notch of the first arc-extinguishing grid, and the length and depth of the arc-extinguishing notch of the third arc-extinguishing grid are greater than the length and depth of the arc-extinguishing notch of the second arc-extinguishing grid.

[0014] Preferably, the arc extinguishing notch at one end of the arc extinguishing grid is U-shaped, and the bottom of the U-shaped arc extinguishing notch of the second arc extinguishing grid and the third arc extinguishing grid is further provided with a notch to form a Y-shaped arc extinguishing notch, and an arc-striking lug is provided in the U-shaped arc extinguishing notch of the first arc extinguishing grid.

[0015] Preferably, the arc extinguishing chamber housing of the arc extinguishing chamber comprises an arc extinguishing chamber cover and an arc extinguishing chamber frame, wherein the arc extinguishing chamber frame comprises a first outer side wall, an intermediate side wall and a second outer side wall which are arranged in sequence and vertically spaced and parallel to each other, and further comprises a top wall arranged on the top of the first outer side wall, the intermediate side wall and the second outer side wall;

[0016] The arc extinguishing chamber frame has an opening on one side as an inlet side facing the moving contact, and an opening on the other side as an assembly side assembled with the arc extinguishing chamber cover. The partition plate is connected to the assembly side of the middle side wall.

[0017] The arc extinguishing chamber cover comprises two cover side walls arranged vertically and spaced apart, a cover back plate connected to one side of the two cover side walls, and a cover upper cover arranged on the top of the two cover side walls and the cover back plate.

[0018] The assembly side of the arc extinguishing chamber frame is connected to the arc extinguishing chamber cover, so that the two cover side walls of the arc extinguishing chamber cover are connected to the first outer side wall and the second outer side wall of the arc extinguishing chamber frame, and the cover upper cover of the arc extinguishing chamber cover is connected to the top wall of the arc extinguishing chamber frame to form an arc extinguishing chamber shell.

[0019] Preferably, on the entrance side of the arc extinguishing chamber frame, the first outer wall, the middle side wall and the second outer wall are provided with magnet mounting grooves for mounting permanent magnets, and the side walls on both sides of the middle side wall are provided with magnet mounting grooves, and the magnet mounting grooves are sealed by baffles.

[0020] Preferably, two magnet mounting grooves for mounting permanent magnets are provided on the top wall, and the permanent magnets on the top wall are sealed by an upper cover of the arc extinguishing chamber cover.

[0021] Preferably, on the assembly side of the arc extinguishing chamber frame, the side wall between the first outer side wall and the middle side wall, and the side wall between the middle side wall and the second outer side wall are provided with a plurality of front grid slots for installing arc extinguishing grids; the partition plate is connected to the middle side wall and protrudes outside the arc extinguishing chamber frame; a partition plate slot for fixing the partition plate is provided in the middle part of the cover back plate, and a plurality of rear grid slots for installing arc extinguishing grids are provided on the inner walls of the two cover side walls.

[0022] Preferably, an exhaust arc isolation net structure is provided on the cover back plate.

[0023] Preferably, the exhaust arc isolation net structure is arranged on the upper side of the cover back plate close to the cover side wall, and the exhaust arc isolation net structure includes a plurality of exhaust holes arranged in an array.

[0024] Preferably, the arc extinguishing chamber cover is snap-fitted to the arc extinguishing chamber frame, a plurality of first snaps are provided on the arc extinguishing chamber cover, and a plurality of first snap grooves cooperating with the first snaps are provided on the arc extinguishing chamber frame.

[0025] The arc extinguishing chamber of the present invention is provided with two arc extinguishing cavities, which are respectively used to cooperate with two breaking points of a single-pole moving and static contact to form a single-pole double-cavity arc extinguishing chamber, thereby improving the high-voltage breaking and arc extinguishing capability of the circuit breaker.

[0026] In addition, permanent magnets are set on both sides and the top of each arc extinguishing chamber. The permanent magnets on both sides are used to increase the magnetic field when interrupting a small DC current. The permanent magnets form a magnetic field to blow the current into the arc extinguishing chamber. The permanent magnet on the top is used to magnetize the arc extinguishing grid when there is not enough opening distance after reducing the volume. The permanent magnet on the top is set for large current interruption.

[0027] In addition, the arc extinguishing chamber is assembled by an arc extinguishing chamber cover and an arc extinguishing chamber frame, and has a compact structure, which is convenient for assembling arc extinguishing grids, permanent magnets, and permanent magnets. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1It is a schematic structural diagram of a circuit breaker embodiment of the present invention;

[0029] Figure 2 is a schematic structural diagram of an embodiment of a contact system of the present invention;

[0030] Figure 3 It is a schematic diagram of the coordination between the arc extinguishing chamber and the moving contact of the present invention;

[0031] Figure 4 is a schematic diagram of the layout of an embodiment of the first stationary contact and the second stationary contact of the present invention;

[0032] Figure 5 It is a structural schematic diagram of the insulation cover of the static contact of the present invention;

[0033] Figure 6 It is a schematic diagram of assembling the first stationary contact, the second stationary contact and the stationary contact insulation cover of the present invention;

[0034] Figure 7 It is a schematic diagram of the current flow direction of the first stationary contact and the moving contact of the present invention;

[0035] Figure 8 It is a schematic diagram of the current flow direction of the cooperation between the second stationary contact and the moving contact of the present invention;

[0036] Figure 9-10 is an exploded view of the arc extinguishing chamber of the present invention;

[0037] Fig.11 is a schematic diagram of the arc extinguishing chamber cover from another angle of the present invention;

[0038] Fig.12 It is a schematic diagram of the arc extinguishing chamber frame of the present invention from another angle. DETAILED DESCRIPTION

[0039] The following embodiments are combined with the accompanying drawings to further illustrate the specific implementation of a contact system and an arc extinguishing system of the present invention. The contact system and the arc extinguishing system of the present invention are not limited to the description of the following embodiments.

[0040] like Figure 1-3As shown, an embodiment of a circuit breaker includes a handle 11, an operating mechanism 12, a contact system, an arc extinguishing system, a tripping system 15, a first terminal 16, and a second terminal 17. The contact system includes at least one pole contact mechanism, each pole contact mechanism includes a set of moving contacts 2 and static contacts used in conjunction with each other, the handle 11 is connected to the operating mechanism 12, the moving contact 2 is connected to the operating mechanism 12 through a contact support 13, the moving contact 2 and the static contact are arranged oppositely, the handle 11 drives the moving contact 2 to move through the operating mechanism 12 to contact and separate with the static contact to achieve the closing and opening of the circuit breaker, the arc extinguishing system is arranged oppositely to the moving contact 2 and the static contact to extinguish the arc when the moving and static contacts are separated, and when a fault occurs, the tripping system 15 is actuated to drive the operating mechanism 12 to trip and open the circuit breaker. The circuit breaker shown in the figure includes a two-pole contact mechanism, and of course, the circuit breaker can be provided with only a single-pole contact mechanism, or a three-pole, four-pole or more-pole contact mechanism as required. The common tripping system 15 is a thermal tripping device for overload protection including a bimetallic strip and an instantaneous tripping device for short circuit protection including an electromagnetic mechanism. The tripping system 15 in the figure is a tripping system 15 that integrates a thermal tripping device and an instantaneous tripping device. This is the prior art in the art and will not be described in detail. The switch electrical apparatus of the present invention is implemented by a circuit breaker. Of course, the improved arc extinguishing chamber and contact mechanism of the present invention are also applicable to other types of switch electrical apparatuses.

[0041] like Figure 2-8 As shown, an improvement of the present invention is that each pole contact mechanism includes a Y-shaped moving contact 2 and a static contact consisting of a first static contact 4 and a second static contact 3. One end of the Y-shaped moving contact 2 is spaced apart and used to cooperate with the first static contact 4 and the second static contact 3 respectively, to form a single-pole double-breakpoint contact mechanism, which can be applicable to AC and DC systems.

[0042] The moving contact 2 includes two moving contact arms 21 and a moving contact connecting arm 22. One end of the two moving contact arms 21 is connected to one end of the moving contact connecting arm 22, and the other ends of the two moving contact arms 21 are arranged at intervals to form a Y-shaped moving contact 2. The two moving contact arms 21 cooperate with the first static contact 4 and the second static contact 3, respectively. When one end of the two moving contact arms 21 contacts the first static contact 4 and the second static contact 3, respectively, the contact mechanism closes and turns on the power supply. When one end of the two moving contact arms 21 separates from the first static contact 4 and the second static contact 3, respectively, the contact mechanism disconnects and turns off the power supply.

[0043] The first static contact 4 is a U-shaped structure capable of reversing the current, and the second static contact 3 is a flat plate structure that does not reverse the current. The first static contact 4 includes a first static contact plate 41 for cooperating with the moving contact 2, and a first static connecting plate 42 connected to the first static contact plate 41. One end of the first static contact plate 41 connected to the first static connecting plate 42 is reversely bent so that the end of the other end of the first static contact plate 41 is located on one side of the first static connecting plate 42 to form a U-shaped structure, so that the direction of the current flowing through the first static connecting plate 42 is opposite to the direction of the current flowing through the first static contact plate 41.

[0044] The two moving contact contact arms 21 respectively cooperate with the first static contact plate 41 of the first static contact 4 and the second static contact 3, so that when closed, the direction of the current flowing through the first static contact plate 41 is opposite to the direction of the current flowing through a moving contact contact arm 21 cooperating with the first static contact plate 41, and the direction of the current flowing through the second static contact 3 is opposite to the direction of the current flowing through the other moving contact contact arm 21 cooperating with the second static contact 3.

[0045] The double-breakpoint contact mechanism described in the present invention adopts a double-breakpoint structure to improve the high-voltage breaking capacity, and adopts a Y-shaped moving contact at the same time, which can make the U-shaped structure with reverse current and the first static contact plate 41 with non-reverse current achieve the effect of mutual repulsion between the moving and static contacts. Regardless of whether the main circuit current flows in from the first static contact 4 and flows out from the second static contact 3, or flows in from the second static contact 3 and flows out from the first static contact 4, the effect of mutual repulsion between the moving and static contacts can be achieved. When the circuit breaker encounters a fault current and opens, the circuit breaker's breaking speed can be accelerated by means of the mutual repulsion between the moving and static contacts when the circuit breaker is opened, thereby improving the breaking capacity of the circuit breaker.

[0046] like Figure 2-4 As shown, the first static contact 4 and the second static contact 3 are arranged side by side at one end cooperating with the moving contact 2, and are arranged correspondingly with one end of the two moving contact contact arms 21 of the moving contact 2; the other ends of the first static contact 4 and the second static contact 3 are respectively extended in opposite directions, and the moving contact 2 is provided with one end of the moving contact connecting arm 22 extending in the same direction as the second static contact 3. Specifically, the first static contact 4 and the second static contact 3 are respectively provided with static contacts at one end cooperating with the moving contact 2, and the other ends are respectively extended in opposite directions, and are respectively electrically connected to the second terminal 17 and the first terminal 16 at both ends of the circuit breaker, one of the second terminal 17 and the first terminal 16 is an incoming terminal, and the other is an outgoing terminal, which can be interchangeable, the incoming terminal is connected to the power supply, and the outgoing terminal is usually connected to the load. The two moving contact contact arms 21 of the moving contact 2 are respectively provided with moving contacts, and the moving contact connecting arm 22 of the moving contact 2 is connected to the operating mechanism. Driven by the operating mechanism, the two moving contacts of the moving contact 2 respectively cooperate with the two static contacts of the first static contact 4 and the second static contact 3 to realize the opening and closing of the circuit breaker.

[0047] like Figure 2-3 As shown, the Y-shaped moving contact 2 includes two moving contact arms 21 and a moving contact connecting arm 22, one end of the two moving contact arms 21 is connected to one end of the moving contact connecting arm 22 respectively, the other ends of the two moving contact arms 21 are arranged at intervals and provided with moving contacts, which are used to cooperate with the static contacts on the first static contact 4 and the second static contact 3, and the two moving contact arms 21 form a V-shaped or U-shaped or similar shape. Preferably, one end of the moving contact arm 21 that cooperates with the static contact is bent and extended to the side close to the static contact and a moving contact is provided at the end. The other end of the moving contact connecting arm 22 is used to connect to the contact support 13, and the moving contact connecting arm 22 forms an I-shaped straight line structure. It should be noted that the Y-shaped structure of the moving contact 2 refers to a similar shape structure, mainly referring to the two breaking points formed at one end of the moving contact 2 that cooperates with the static contact, which are respectively used to cooperate with the first static contact 4 and the second static contact 3. The two moving contact contact arms 21 can form a V-shaped or U-shaped or similar structure, and the moving contact connecting arm 22 is an I-shaped straight structure, and can also have appropriate bends or protrusions, all of which belong to the protection scope of the present invention. In this embodiment, the two moving contact contact arms 21 are closer to a U-shape. The Y-shaped moving contact 2 can be an integrated structure, or it can be formed by riveting or welding two moving contact contact arms 21 and a moving contact connecting arm 22.

[0048] Preferably, a moving contact insulating sleeve 23 is provided at one end of the moving contact connecting arm 22 for connecting with the operating mechanism.

[0049] Specifically, the moving contact 2 of this embodiment is composed of two Z-shaped moving contact pieces, each of which is composed of a first parallel section, a bent section, and a second parallel section connected in sequence. The sides of the first parallel sections of the two Z-shaped moving contact pieces are tightly attached to form a moving contact connecting arm 22. The bent sections of the two Z-shaped moving contact pieces are bent and extended in opposite directions so that the second parallel sections of the two Z-shaped moving contact pieces are arranged at intervals. The bent sections and the second parallel sections of the two Z-shaped moving contact pieces form two moving contact contact arms 21. One end of the second parallel section is bent toward one side and a moving contact point is provided at the end. A moving contact insulating sleeve 23 is provided at one end of the contact connecting arm 22 connected to the contact support 13, and the moving contact insulating sleeve 23 wraps one end of the contact connecting arm 22.

[0050] The assembly method of the moving contact 2 of this embodiment is as follows: a moving contact installation cavity is provided on the contact support 13, one end of the moving contact connecting arm 22 and the moving contact insulating sleeve 23 are inserted into the moving contact installation cavity together, and the moving contact connecting arm 22 is fixed to the contact support 13 through a rotating shaft and a spring, the rotating shaft passes through one end of the moving contact connecting arm 22 and the moving contact insulating sleeve 23 to connect with the contact support 13, and the moving contact connecting arm 22 is elastically fixed by the spring to achieve overtravel. The contact support 13 is a contact rotating shaft, and a plurality of moving contact installation cavities are provided in the radial direction, and the moving contact 2 of the multi-pole contact mechanism can be installed. The moving contact 2 can rotate with the contact support 13, driving the moving contact point at one end of the moving contact 2 to swing, and the moving contact 2 can also rotate independently around the rotating shaft to achieve overtravel. As another embodiment, the moving contact 2 can also be assembled on a four / five-link operating mechanism and rotate independently around the rotating shaft.

[0051] like Figure 7 As shown, the first static contact 4 includes a first static contact plate 41 for cooperating with the moving contact 2, and a first static connecting plate 42 connected to the first static contact plate 41. One end of the first static contact plate 41 connected to the first static connecting plate 42 is reversely bent so that the end of the other end of the first static contact plate 41 is located on one side of the first static connecting plate 42 to form a U-shaped structure, so that the direction of the current flowing through the first static connecting plate 42 is opposite to the direction of the current flowing through the first static contact plate 41. Figure 4 , 7 In the example, the first static contact plate 41 is reversely bent and then stacked on the first static connecting plate 42, and the first static connecting plate 42 is used for wiring and electrical connection. In this embodiment, the first static contact 4 is integrally formed, and is formed by bending a sheet-like first contact plate. The front section of the first contact plate is reversely bent to form the first static contact plate 41, the middle section of the first contact plate forms the first static connecting plate 42, and the tail section of the first contact plate forms the second wiring terminal 17 for wiring. The second wiring terminal 17 and the first static connecting plate 42 are bent to form a staggered step to adapt to the wiring position. Of course, the first static connecting plate 42 can also be electrically connected to the second wiring terminal 17 through a wire or other mechanism. Further, a static contact is provided at one end of the first static contact plate 41, and the first static contact plate 41 is reversely bent more than 180 degrees, so that the first static contact plate 41 is tilted relative to the first static connecting plate 42, so that the static contact is tilted and matched with the moving contact on the moving contact 2.

[0052] like Figure 8 As shown, the second static contact 3 includes a second static contact plate 31 for cooperating with the moving contact 2, and a second static connecting plate 32 connected to the second static contact plate 31. One end of the second static contact plate 31 is connected to the second static connecting plate 32, and the other end extends away from the second static connecting plate 32, so that the direction of the current flowing through the second static connecting plate 32 is the same as the direction of the current flowing through the second static contact plate 31. Figure 3 ,8 In the example, one end of the second static connection plate 32 connected to the second static contact plate 31 is bent upward and connected to the second static contact plate 31 to raise the second static contact plate 31. One end of the second static contact plate 31 provided with a static contact is bent downward at an angle so that the static contact is tilted to cooperate with the moving contact on the moving contact 2. The other end of the second static connection plate 32 is used for wiring and electrical connection. In this embodiment, the other end of the second static connection plate 32 is electrically connected to the tripping system 15, and the tripping system 15 is electrically connected to the first terminal 16. Of course, the second static connection plate 32 can be directly connected to the tripping system 15, or can be connected to the tripping system 15 through a soft wire, and the other end of the second static connection plate 32 can also be directly or through other mechanisms. Electrical connection to the first terminal 16.

[0053] The novel contact system described in the present invention can achieve the effect of mutual repulsion between the moving and static contacts, regardless of whether the main circuit current flows into the second terminal 17 of the circuit breaker and flows out of the first terminal 16, or flows into the first terminal 16 of the circuit breaker and flows out of the second terminal 17. When the circuit breaker encounters a fault current and opens, the mutual repulsion between the moving and static contacts when the circuit breaker opens can be used to accelerate the circuit breaker's breaking speed and improve the circuit breaker's breaking capacity.

[0054] like Figure 7-8 As shown, when the second wiring terminal 17 is used as the incoming terminal and the first wiring terminal 16 is used as the outgoing terminal, when the circuit breaker using the contact system of the present invention is closed, the moving contacts on the two moving contact arms 21 of the moving contact 2 are respectively in contact with the two static contacts of the first static contact 4 and the second static contact 3 at the same time, and the main circuit current flows into the circuit breaker through the incoming terminal, and the main circuit current in the circuit breaker flows in reverse through the first static contact 4, and then through a moving contact arm 21 ( Figure 2 The first static contact 4 with the reverse current and the moving contact arm 21 with the positive current on the left side form an effect of mutual repulsion of opposite currents ( Figure 7 ); Then the main circuit current passes through the Y-shaped moving contact 2 and another moving contact contact arm 21 ( Figure 2 The current flows into the moving contact arm 21 on the right side of the middle in the reverse direction, and then flows into the second static contact 3 in the forward direction. At this time, the moving contact arm 21 on the right side of the current in the reverse direction and the flat static contact plate 3 in the forward direction form an effect of mutual repulsion of opposite currents ( Figure 8 ), then the main circuit current flows into the tripping system through the second static contact 3, flows into the outgoing terminal from the tripping system, and finally flows out of the circuit breaker. When the first terminal 16 is the incoming terminal and the second terminal 17 is the outgoing terminal, the first static contact 4 and a moving contact arm 21 ( Figure 2 The current direction on the left side of the middle is always opposite, and the second static contact 3 and a moving contact arm 21 ( Figure 2The directions of the currents on the right side of the figure are always opposite, which can form the effect of mutual repulsion of currents in opposite directions. The mutual repulsion between the moving and static contacts when the circuit breaker is breaking can accelerate the breaking speed of the circuit breaker and improve the breaking capacity of the circuit breaker.

[0055] Preferably, a portion of the second static contact 3 connected to the tripping system 14 is provided with a static contact insulating sleeve.

[0056] As another improvement of the present invention, Figure 2 As shown, each pole contact mechanism further includes a stationary contact insulating cover 6 for separating the first stationary contact 4 from the second stationary contact 3 .

[0057] like Figure 5-6 As shown, a preferred embodiment of the static contact insulation cover 6 is a cover structure with an opening at the bottom, which is used to separate the first static contact 4 and the second static contact 3 from one end of the moving contact 2. An insulating partition 61 is provided in the static contact insulation cover 6 to separate the static contact insulation cover 6 into two cavities, which are respectively a first cavity for cooperating with the second static contact 3 and a second cavity for cooperating with the first static contact 4. A first inlet 62 for the second static contact 3 to extend into is provided at a position corresponding to the first cavity on the side wall of one end of the static contact insulation cover 6, and a second inlet 63 for the first static contact 4 to extend into is provided at a position corresponding to the second cavity on the side wall of the other end of the static contact insulation cover 6. A first mounting hole 64 and a second mounting hole 65 for the static contact of the second static contact 3 and the static contact of the first static contact 4 to extend out are provided at the top of the static contact insulation cover 6, which correspond to the first cavity and the second cavity, respectively. The static contact insulation cover 6 separates the first static contact 4 and the second static contact 3, making the structure compact, safe and reliable.

[0058] Preferably, Figure 2 , 5 As shown in , 6 , the static contact insulation cover 6 also covers the first static connecting plate 42 of the first static contact 4 , and one end of the static contact insulation cover 6 having the second entrance 63 extends upward to have an insulating side wall 66 for isolating the second terminal 17 .

[0059] Preferably, Figure 1 As shown, the arc extinguishing chamber 5 of the arc extinguishing system is installed on the static contact insulation cover 6. The arc extinguishing chamber 5 is arranged at a position corresponding to the first static connecting plate 42 on the static contact insulation cover 6 and covers the two static contacts on the first static contact 4 and the second static contact 3. The static contact insulation cover 6 is provided with a U-shaped groove for installing the arc extinguishing chamber 5, and the U-shaped groove for installing the arc extinguishing chamber 5 is formed between the insulating side wall 66 and one end provided with the static contact. The arc extinguishing chamber 5 is installed in the U-shaped groove, covers the two static contacts, and the entrance side of the arc extinguishing chamber 5 faces the moving contact 2.

[0060] As another improvement of the present invention, Figure 1 , 3As shown, the arc extinguishing system includes an arc extinguishing chamber 5, which is provided with two separated arc extinguishing cavities, which are used to respectively cooperate with the moving contacts on the two moving contact contact arms 21 of the Y-shaped moving contact 2. The two moving contacts of the Y-shaped moving contact 2 extend into the two arc extinguishing cavities to swing, respectively, and cooperate with the static contacts of the first static contact 4 and the second static contact 3. When the circuit breaker is opened, the two moving contacts of the Y-shaped moving contact 2 are separated from the static contacts of the first static contact 4 and the second static contact 3, so as to achieve the effect of arc extinguishing with double breakpoints on the same side of the single-pole contact system, which can be applied to arc extinguishing of AC and DC circuits. The bottom of the arc extinguishing chamber 5 is open, and it is assembled with the static contact so that the two arc extinguishing cavities of the arc extinguishing chamber 5 cover the two static contacts of the static contact. When the circuit breaker disconnects the loop current, the two breakpoints of the contact mechanism on the same side of the single pole are disconnected in the two arc extinguishing chambers in the arc extinguishing chamber respectively. When the circuit breaker connects the loop current, the two breakpoints of the contact mechanism on the same side of the single pole are closed in the two arc extinguishing chambers in the arc extinguishing chamber respectively. When a fault current appears in the circuit of the circuit breaker, voltage division and arc extinguishing can be completed in the single-pole double-chamber arc extinguishing chamber. The arc extinguishing chamber 5 of the present invention can not only cooperate with the contact mechanism of the present invention, but also cooperate with other single-pole double-breakpoint contact mechanisms, that is, cooperate with a moving contact with two moving contacts and a static contact with two static contacts. For example, the first static contact of the static contact may not reverse the current, and the first static contact and the second static contact may be arranged side by side to form a static contact, etc. The circuit breaker adds a breakpoint in the same pole to achieve voltage division, so that the purpose of breaking a higher voltage is achieved in the single pole, and the double-chamber arc extinguishing chamber also meets the requirement of a narrow arc path for breaking a small DC current.

[0061] An embodiment of the arc extinguishing chamber 5 of the present invention, wherein a plurality of arc extinguishing grids are arranged in an interval and stacked manner, two arc extinguishing notches are arranged in an interval and stacked manner at one end of the arc extinguishing grid to form a W-shaped notch, and the two arc extinguishing notches of the plurality of arc extinguishing grids arranged in an interval and stacked manner form two arc extinguishing cavities, which are used to respectively cooperate with the two moving contacts of the Y-shaped moving contact 2, and can be applicable to AC and DC circuits.

[0062] like Figure 9-10, a preferred embodiment of the arc extinguishing chamber 5 of the present invention, the arc extinguishing chamber shell of the arc extinguishing chamber 5 is divided into two cavities by a partition plate 55, and each cavity is provided with a plurality of arc extinguishing grids 53 arranged in intervals and stacked to form two arc extinguishing cavities, which can be suitable for AC and DC circuits. Preferably, at least one permanent magnet 54 is provided on both sides of each arc extinguishing cavity, which is suitable for arc extinguishing in DC circuits. One or two or more permanent magnets 54 can be provided on each side of each arc extinguishing cavity as needed. Further, permanent magnets 54 are respectively provided at positions corresponding to the two arc extinguishing cavities on the top of the arc extinguishing chamber shell. In this embodiment, two permanent magnets 54 are provided on the top of the arc extinguishing chamber shell, and each permanent magnet 54 corresponds to an arc extinguishing cavity. The permanent magnets on both sides are used to increase the magnetic field when disconnecting a small DC current. The magnetic field is formed by the permanent magnets to blow the current into the arc extinguishing chamber. The permanent magnet on the top is used to reduce the volume and when there is not enough opening distance, the arc can be attracted into the arc-extinguishing grid by magnetizing the arc-extinguishing grid. The permanent magnet on the top is set for large current disconnection.

[0063] Preferably, permanent magnets 54 are provided on both sides of each arc extinguishing cavity, and the permanent magnets on both sides of the two arc extinguishing cavities are divided into two groups, and the polarity directions of each group of permanent magnets are respectively N and S and are set in the same direction. That is, if the permanent magnet on the left side of each group of permanent magnets is N on the top and S on the bottom, the permanent magnet on the right side is also N on the top and S on the bottom; vice versa, if the permanent magnet on the left side is S on the top, the permanent magnet on the right side is also S on the top. The magnetic pole direction of the permanent magnet is set according to the left-hand rule, and the direction of the four fingers is the direction of the current. The magnetic field passes through the palm to ensure that the direction of the electromagnetic force is pointing to the direction of the arc extinguishing grid in the corresponding arc extinguishing cavity. The magnetic pole directions of the two groups of permanent magnets may be in the same direction or in different directions.

[0064] Preferably, the two permanent magnets 54 on the top of the arc extinguishing chamber housing correspond to the two arc extinguishing cavities respectively, and the magnetic poles of the two permanent magnets 54 are arranged in opposite directions.

[0065] like Fig. 9 As shown, each arc extinguishing cavity is provided with an arc extinguishing grid group including a plurality of stacked arc extinguishing grids 53, the arc extinguishing grids 53 are all made of non-magnetic conductive materials, and an arc extinguishing notch is provided at one end of the arc extinguishing grid 53. Preferably, each arc extinguishing grid group includes arc extinguishing grids 53 of multiple sizes. Fig.10As shown, each arc-extinguishing grid group includes a first arc-extinguishing grid 536, a second arc-extinguishing grid 535, a third arc-extinguishing grid 534, and a fourth arc-extinguishing grid 533 of different sizes. Each arc-extinguishing grid group is stacked from top to bottom with at least one first arc-extinguishing grid 536, at least one third arc-extinguishing grid 534, at least one second arc-extinguishing grid 535, multiple third arc-extinguishing grids 534, at least one second arc-extinguishing grid 535, at least one third arc-extinguishing grid 534, and at least one fourth arc-extinguishing grid 533. The first arc-extinguishing grid 536 can block the arc, and the remaining arc-extinguishing grids can divide and extinguish the arc. The thickness of the fourth arc-extinguishing grid 533 is greater than that of other arc-extinguishing grids, which can prevent the arc from gathering at the bottom of the arc-extinguishing chamber and melting it for evaporation. Furthermore, a downwardly bent arc-initiating lug is provided in the arc-extinguishing notch of the first arc-extinguishing grid 536, and the length and arc-extinguishing notch depth of the third arc-extinguishing grid 534 are greater than the length and arc-extinguishing notch depth of the second arc-extinguishing grid 535. As a modified solution, it is obvious that the structures of multiple arc-extinguishing grids may be the same.

[0066] Preferably, the arc-extinguishing notch of the arc-extinguishing grid 53 is V-shaped or U-shaped. In this embodiment, the arc-extinguishing notch of the arc-extinguishing grid 53 is U-shaped, and the bottom of the U-shaped arc-extinguishing notch of the second arc-extinguishing grid 535 and the third arc-extinguishing grid 534 is further provided with a communicating notch, forming an arc-extinguishing notch approximately in a Y shape. An arc-initiating lug is provided in the U-shaped arc-extinguishing notch of the first arc-extinguishing grid 536.

[0067] Preferably, the arc extinguishing chamber housing and the partition plate 55 can be integrally formed to form two cavities, and the side walls on both sides of the cavity are provided with a plurality of grid slots for installing the arc extinguishing grids 53 and magnet installation slots for installing the permanent magnets 54. The arc extinguishing chamber housing can also be assembled.

[0068] like Figure 9-10 In the preferred embodiment shown, the arc extinguishing chamber housing of the arc extinguishing chamber 5 includes an arc extinguishing chamber cover 51 and an arc extinguishing chamber frame 52, and the arc extinguishing chamber cover 51 and the arc extinguishing chamber frame 52 are assembled to form the arc extinguishing chamber housing.

[0069] The arc extinguishing chamber frame 52 includes a first outer side wall 521, an intermediate side wall 522 and a second outer side wall 523 which are arranged in parallel and vertically spaced sequence, and also includes a top wall 524 arranged on the top of the first outer side wall 521, the intermediate side wall 522 and the second outer side wall 523; one side opening of the arc extinguishing chamber frame 52 is the inlet side facing the moving contact 2, and the other side opening is the assembly side assembled with the arc extinguishing chamber cover 51; the arc extinguishing chamber cover 51 includes two cover side walls 511 arranged vertically spaced and two cover side walls 514 arranged vertically spaced. A cover back plate 513 connected to one side of 511, a cover upper cover 512 arranged on the top of the two cover side walls 511 and the cover back plate 513, the assembly side of the arc extinguishing chamber frame 52 is connected to the arc extinguishing chamber cover 51, so that the two cover side walls 511 of the arc extinguishing chamber cover 51 are connected with the first outer side wall 521 and the second outer side wall 523 of the arc extinguishing chamber frame 52, the cover upper cover 512 of the arc extinguishing chamber cover 51 is connected with the top wall 524 of the arc extinguishing chamber frame 52 to form an arc extinguishing chamber shell, and the partition plate 55 divides the arc extinguishing chamber shell into two cavities.

[0070] At the entrance side of the arc extinguishing chamber frame 52, the first outer side wall 521, the middle side wall 522 and the second outer side wall 523 are provided with magnet installation grooves 525 for installing the permanent magnet 54, and the side walls on both sides of the middle side wall 522 are provided with magnet installation grooves 525, the permanent magnet 54 is installed in the magnet installation grooves 525, and the magnet installation grooves 525 are sealed by baffles 540. The magnet installation grooves 525 are square grooves matching the permanent magnet 54, and a plurality of baffles 540 are respectively connected to the arc extinguishing chamber frame 52.

[0071] On the assembly side of the arc extinguishing chamber frame 52, the side wall between the first outer side wall 521 and the middle side wall 522, and the side wall between the middle side wall 522 and the second outer side wall 523 are provided with a plurality of grid front clamping grooves 526 for installing arc extinguishing grids; the partition plate 55 is connected to the assembly side of the middle side wall 522 and protrudes outside the arc extinguishing chamber frame 52; two magnet mounting grooves 525 for mounting permanent magnets 54 are provided on the top wall 524, and the permanent magnets 54 are installed in the magnet mounting grooves 525, and the permanent magnets 54 on the top wall 524 are sealed by the cover upper cover 512 of the arc extinguishing chamber cover 51.

[0072] A partition plate snap-in slot 514 for fixing the partition plate 55 is provided in the middle of the cover back plate 513 , and a plurality of grid rear snap-in slots 516 for installing the arc-extinguishing grids 53 are provided on the inner side walls of the two cover side walls 511 .

[0073] Preferably, an exhaust arc isolation net structure 518 is provided on the cover back plate 513. Preferably, the exhaust arc isolation net structure 518 is provided on the upper side of the cover back plate 513 close to the cover side wall 511, and the exhaust arc isolation net structure 518 includes a plurality of small exhaust holes arranged in an array. Of course, the cover back plate 513 may also be provided with only a few large exhaust holes.

[0074] Preferably, the cover upper cap 512 protrudes toward one side of the arc extinguishing chamber frame 52 to form a pressure plate. After the arc extinguishing chamber cover 51 and the arc extinguishing chamber frame 52 are assembled, the pressure plate seals the permanent magnet 54 on the top wall 524 of the arc extinguishing chamber frame 52.

[0075] The arc extinguishing chamber cover 51 is snap-fitted to the arc extinguishing chamber frame 52 . The arc extinguishing chamber cover 51 is provided with a plurality of first snap-fits 517 , and the arc extinguishing chamber frame 52 is provided with a plurality of first snap-fit ​​grooves 527 matched with the first snap-fits 517 .

[0076] The assembly method of the arc extinguishing chamber 5 is as follows: insert the front end of the arc extinguishing grid pieces 52 with arc extinguishing notches of the first group of multiple spaced arc extinguishing grid pieces 52 in parallel into the grid piece front clamping groove 526 between the first outer side wall 521 and the middle side wall 522 of the arc extinguishing chamber frame 52, and insert the front end of the arc extinguishing grid pieces 52 with arc extinguishing notches of the second group of multiple spaced arc extinguishing grid pieces 52 in parallel into the grid piece front clamping groove 526 between the middle side wall 522 and the second outer side wall 523; two permanent magnets 54 are installed on the magnet mounting grooves 525 of the first outer side wall 521 and the middle side wall 522, and two permanent magnets 54 are installed on the magnet mounting grooves 525 of the middle side wall 522 and the second outer side wall 523, and the magnet mounting grooves 525 are sealed by the baffle 540; the two permanent magnets 54 are installed on the top of the arc extinguishing chamber frame 52, and the arc extinguishing chamber cover 51 is clamped with the arc extinguishing chamber frame 52 from the assembly side of the arc extinguishing chamber frame 52, the first clamp 517 is clamped into the first clamp groove 527, and the partition plate 55 is clamped into the partition plate clamp The rear ends of the two groups of arc-extinguishing grids 52 are inserted into the grid rear slots 516 of the arc-extinguishing chamber cover 51. The two cover side walls 511 of the arc-extinguishing chamber cover 51 are connected with the first outer side wall 521 and the second outer side wall 523 of the arc-extinguishing chamber frame 52. The cover upper cover 512 of the arc-extinguishing chamber cover 51 is connected with the top wall 524 of the arc-extinguishing chamber frame 52 to form an arc-extinguishing chamber shell. The partition plate 55 divides the arc-extinguishing chamber shell into two cavities, and the protruding pressure plate of the cover upper cover 512 seals the arc-extinguishing chamber frame. The magnet mounting groove 52 at the top of 52, the cavity surrounded by the first outer wall 521, a corresponding cover side wall 511, the middle side wall 522 and the partition plate 55, and the first group of multiple arc-extinguishing grids 52 form an arc-extinguishing cavity; the cavity surrounded by the second outer wall 523, another corresponding cover side wall 511, the middle side wall 522 and the second group of multiple arc-extinguishing grids 52 form another arc-extinguishing cavity; the arc-extinguishing chamber 5 of this embodiment is easy to assemble and has a compact and reliable structure.

[0077] When a fault current appears in the circuit breaker, the two breakpoints of the contact mechanism on the same side of the single pole are disconnected in the two arc extinguishing chambers in the arc extinguishing chamber, and the arc can be extinguished by voltage division in the single-pole double-chamber arc extinguishing chamber. The arc is driven by the magnetic field and fluid effect in the arc extinguishing chamber, and is divided into multiple short arcs by multiple arc extinguishing grids. The arc deionization effect is enhanced by the metal arc isolating sheet, so that the arc gradually becomes smaller until it is extinguished. In this way, the high-voltage arc extinguishing capability of the DC circuit breaker is improved. The arc extinguishing chamber can also be used for AC circuit breakers after the permanent magnet is removed.

[0078] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A switchgear, comprising a contact system and an arc extinguishing system, wherein the arc extinguishing system comprises at least one arc extinguishing chamber (5), the arc extinguishing chamber cooperates with a contact mechanism of the contact system, and is characterized in that: The arc extinguishing chamber (5) has an arc extinguishing chamber housing divided into two cavities by a partition plate (55), and each cavity is provided with a plurality of arc extinguishing grids (53) arranged in a stacked manner to form two arc extinguishing cavities. The contact mechanism is a single-pole double-breakpoint contact mechanism, comprising a moving contact with two moving contacts and a stationary contact with two stationary contacts. The two moving contacts of the moving contact extend into the two arc extinguishing cavities of the arc extinguishing chamber respectively to cooperate with the two stationary contacts.

2. The switch device according to claim 1, characterized in that: At least one permanent magnet (54) is provided on both sides of each arc extinguishing chamber.

3. The switch device according to claim 1 or 2, characterized in that: Permanent magnets (54) are respectively arranged at the top of the arc extinguishing chamber shell at a position corresponding to each arc extinguishing cavity.

4. The switch device according to claim 3, characterized in that: The magnetic pole direction of the permanent magnet (54) at the top of one arc extinguishing chamber is opposite to the magnetic pole direction of the permanent magnet (54) at the top of another arc extinguishing chamber.

5. The switch device according to claim 2, characterized in that: The permanent magnets on both sides of the two arc extinguishing cavities are divided into two groups, and the polarity directions of the permanent magnets in each group are respectively N and S arranged in the same direction relative to each other, and the direction of the electromagnetic force points to the arc extinguishing grid in the corresponding arc extinguishing cavity.

6. The switch device according to claim 1 or 2, characterized in that: The multiple stacked arc-extinguishing grids (53) in each arc-extinguishing cavity form an arc-extinguishing grid group, and each arc-extinguishing grid group includes arc-extinguishing grids (53) of multiple sizes that are different. The arc-extinguishing grids (53) are made of non-magnetic conductive material.

7. The switch device according to claim 6, characterized in that: Each arc-extinguishing grid group comprises a first arc-extinguishing grid (536), a second arc-extinguishing grid (535), a third arc-extinguishing grid (534), and a fourth arc-extinguishing grid (533) of different sizes. Each arc-extinguishing grid group is stacked in sequence from top to bottom, including at least one first arc-extinguishing grid (536), at least one third arc-extinguishing grid (534), at least one second arc-extinguishing grid (535), a plurality of third arc-extinguishing grids (534), at least one second arc-extinguishing grid (535), at least one third arc-extinguishing grid (534), and at least one fourth arc-extinguishing grid (533). The thickness of the fourth arc-extinguishing grid (533) is greater than that of the other arc-extinguishing grids. An arc-striking lug bent downward is provided in the arc-extinguishing notch of the first arc-extinguishing grid (536). The length and depth of the arc-extinguishing notch of the third arc-extinguishing grid (534) are greater than the length and depth of the arc-extinguishing notch of the second arc-extinguishing grid (535).

8. The switch device according to claim 7, characterized in that: The arc extinguishing notch at one end of the arc extinguishing grid (53) is U-shaped, the bottom of the U-shaped arc extinguishing notch of the second arc extinguishing grid (535) and the third arc extinguishing grid (534) is further provided with a notch to form a Y-shaped arc extinguishing notch, and an arc striking lug is provided in the U-shaped arc extinguishing notch of the first arc extinguishing grid (536).

9. The switch device according to claim 1, characterized in that: The arc extinguishing chamber housing of the arc extinguishing chamber (5) comprises an arc extinguishing chamber cover (51) and an arc extinguishing chamber frame (52); the arc extinguishing chamber frame (52) comprises a first outer side wall (521), an intermediate side wall (522) and a second outer side wall (523) which are arranged in sequence and vertically spaced and parallel to each other, and further comprises a top wall (524) arranged on top of the first outer side wall (521), the intermediate side wall (522) and the second outer side wall (523); One side opening of the arc extinguishing chamber frame (52) is the entrance side facing the moving contact (2), and the other side opening is the assembly side assembled with the arc extinguishing chamber cover (51). The partition plate (55) is connected to the assembly side of the middle side wall (522). The arc extinguishing chamber cover (51) comprises two cover side walls (511) arranged vertically and spaced apart, a cover back plate (513) connected to one side of the two cover side walls (511), and a cover upper cover (512) arranged on the top of the two cover side walls (511) and the cover back plate (513). The assembly side of the arc extinguishing chamber frame (52) is connected to the arc extinguishing chamber cover (51), so that the two cover side walls (511) of the arc extinguishing chamber cover (51) are butted with the first outer side wall (521) and the second outer side wall (523) of the arc extinguishing chamber frame (52), and the cover upper cover (512) of the arc extinguishing chamber cover (51) is butted with the top wall (524) of the arc extinguishing chamber frame (52) to form an arc extinguishing chamber shell.

10. The switch device according to claim 9, characterized in that: On the entrance side of the arc extinguishing chamber frame (52), the first outer side wall (521), the middle side wall (522) and the second outer side wall (523) are provided with magnet mounting grooves (525) for mounting permanent magnets (54), and the side walls on both sides of the middle side wall (522) are provided with magnet mounting grooves (525), and the magnet mounting grooves (525) are sealed by a baffle (540).

11. The switch device according to claim 9, characterized in that: Two magnet mounting grooves (525) for mounting permanent magnets (54) are provided on the top wall (524), and the permanent magnets (54) on the top wall (524) are sealed by an upper cover (512) of the arc extinguishing chamber cover (51).

12. The switch device according to claim 9, characterized in that: On the assembly side of the arc extinguishing chamber frame (52), the side wall between the first outer side wall (521) and the middle side wall (522), and the side wall between the middle side wall (522) and the second outer side wall (523) are provided with a plurality of grid front clamping grooves (526) for installing arc extinguishing grids; the partition plate (55) is connected to the middle side wall (522) and protrudes outside the arc extinguishing chamber frame (52); a partition plate clamping groove (514) for fixing the partition plate (55) is provided in the middle of the cover back plate (513), and a plurality of grid rear clamping grooves (516) for installing the arc extinguishing grids (53) are provided on the inner side walls of the two cover side walls (511).

13. The switch device according to claim 9, characterized in that: An exhaust arc isolation net structure (518) is provided on the cover back plate (513).

14. The switch device according to claim 13, characterized in that: The exhaust arc isolation net structure (518) is arranged on the upper side of the cover back plate (513) close to the cover side wall (511), and the exhaust arc isolation net structure (518) includes a plurality of exhaust holes arranged in an array.

15. The switch device according to claim 9, characterized in that: The arc extinguishing chamber cover (51) is snap-fitted to the arc extinguishing chamber frame (52); a plurality of first snap-fits (517) are provided on the arc extinguishing chamber cover (51); and a plurality of first snap-fit ​​grooves (527) cooperating with the first snap-fits (517) are provided on the arc extinguishing chamber frame (52).

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