Arc extinguishing system

Abstract

The utility model relates to the field of low-voltage electric appliances, in particular to an arc extinguishing system, which is characterized in that an exhaust passage is arranged in a shell of the arc extinguishing system and positioned between an exhaust end and an exhaust port of a mounting cavity; in the direction d2, the exhaust passage extends from one end of the arc extinguish chamber to the other end, and the mounting cavity exhaust port is relatively communicated with one end of the exhaust passage; one end of the exhaust passage in the direction d2 is opposite to the exhaust port of the mounting cavity along the direction d1; and the arc extinguishing performance of the arc extinguishing system is good.

Description

Technical Field

[0001] The utility model relates to the field of low-voltage electrical appliances, in particular to an arc extinguishing system. Background Art

[0002] A circuit breaker is a switching device used to disconnect and connect a load circuit, as well as to cut off a faulty circuit to prevent the accident from expanding, thereby ensuring the safe operation of the load circuit. Among them, a 1U circuit breaker often includes a first circuit (used to control the on and off of the positive pole of the load circuit) and a second circuit (a direct-through circuit for electrically connecting the negative pole of the load circuit).

[0003] In existing circuit breakers, the arc extinguishing chamber is located in the same space as other components of the circuit breaker. Arc gas escaping from the arc extinguishing chamber may damage other metal or electrical components in the circuit breaker, and the arc extinguishing performance of the arc extinguishing chamber is poor. Utility Model Content

[0004] The purpose of the utility model is to overcome at least one defect of the prior art and provide an arc extinguishing system with good arc extinguishing performance.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] An arc extinguishing system, comprising an arc extinguishing system housing and an arc extinguishing mechanism disposed within the arc extinguishing system housing, the arc extinguishing mechanism comprising an arc extinguishing chamber, the arc extinguishing system housing comprising an arc extinguishing chamber mounting cavity, an mounting cavity inlet, and an mounting cavity exhaust port, the arc extinguishing chamber mounting cavity being in communication with the external environment only through the mounting cavity inlet and the mounting cavity exhaust port, the mounting cavity inlet being used for allowing one end of a moving contact provided with a moving contact to pass through and enter the arc extinguishing chamber mounting cavity, the arc extinguishing chamber and one end of a static contact provided with a static contact being both disposed within the arc extinguishing chamber mounting cavity, one end of the arc extinguishing chamber being in communication with the mounting cavity inlet relative to one another and serving as an arc inlet end, and the other end of the arc extinguishing chamber being in communication with the mounting cavity exhaust port relative to one another and serving as an exhaust end, the installation cavity inlet, the arc inlet end, the exhaust end, and the installation cavity exhaust port being arranged sequentially along a direction d1; the arc extinguishing chamber comprising at least two arc extinguishing grids sequentially arranged side by side along a direction d2, with the directions d1 and d2 being perpendicular to each other;

[0007] The arc extinguishing system also includes an exhaust duct arranged in the arc extinguishing system shell and located between the exhaust end and the exhaust port of the installation cavity; in the direction d2, the exhaust duct extends from one end of the arc extinguishing chamber to the other end, and the exhaust port of the installation cavity is relatively connected to one end of the exhaust duct; one end of the exhaust duct in the direction d2 is arranged opposite to the exhaust port of the installation cavity along the direction d1.

[0008] Furthermore, the exhaust duct includes a first section of the exhaust duct and a second section of the exhaust duct arranged in sequence and connected along a direction d2, one end of the first section of the exhaust duct is the first end of the exhaust duct and the other end is connected to one end of the second section of the exhaust duct, the width of the first section of the exhaust duct along the direction d1 gradually increases from the first end of the exhaust duct to the other end of the first section of the exhaust duct, and the exhaust port of the installation cavity is relatively connected to the second section of the exhaust duct along the direction d1; in the direction d2, the length of the first section of the exhaust duct is greater than or equal to the length of the second section of the exhaust duct.

[0009] Furthermore, the arc extinguishing mechanism also includes a moving contact arc striking plate and a static contact arc striking plate. One end of the moving contact arc striking plate and the static contact arc striking plate are respectively arranged on both sides of the arc extinguishing chamber along direction d2 and are arranged side by side with the arc extinguishing grid. The other end of the moving contact arc striking plate is used to cooperate with the moving contact that moves to the disconnecting position, and the other end of the static contact arc striking plate is used to cooperate with the static contact.

[0010] Furthermore, the moving contact arc-starting plate includes a first mating section, which is used to be parallel to and in contact with the moving contact that moves to the disconnected position; one end of the static contact arc-starting plate is arranged side by side with the arc-extinguishing grid along direction d2 and the other end is used to be connected to the static contact.

[0011] Furthermore, one end of the moving contact arc striking plate and the static contact arc striking plate are respectively arranged side by side with the arc extinguishing chamber along direction d2 and are respectively located on both sides of the arc extinguishing chamber in direction d2, and the other end are inclined toward the middle of the arc entrance end along direction d2.

[0012] Furthermore, the moving contact arc-starting plate is also used to be electrically connected to the circuit where the moving contact and the static contact are located.

[0013] Furthermore, the arc extinguishing system shell also includes a static contact socket arranged on the side wall of the installation cavity entrance, and the end of the static contact provided with the static contact point passes through the static contact socket and enters the arc extinguishing chamber installation cavity; the arc extinguishing mechanism also includes a free-radiation plate arranged in the exhaust port of the installation cavity.

[0014] Furthermore, the arc extinguishing chamber also includes arc extinguishing chute plates arranged side by side and spaced apart along direction d3, each arc extinguishing grid is arranged between two arc extinguishing chute plates and each arc extinguishing grid plate is fixedly connected to the two arc extinguishing chute plates respectively; the directions d1, d2 and d3 are perpendicular to each other; the moving contact arc striking plate is arranged between the two arc extinguishing chute plates in direction d3 and one end is fixedly connected to the two arc extinguishing chute plates respectively.

[0015] Furthermore, the arc extinguishing chamber also includes two gas-producing plates arranged relatively at intervals along direction d3, and a moving gap is formed between the two gas-producing plates for one end of the moving contact provided with a moving contact point to be inserted into and move therein; the arc extinguishing grids each include two grid feet arranged relatively at intervals along direction d3, and the two grid feet are located on both sides of the two gas-producing plates; the directions d1, d2 and d3 are perpendicular to each other; the gas-producing plates are provided with grid foot slots for the grid feet to be embedded in and which match the grid feet one-to-one.

[0016] Furthermore, the position of the exhaust port of the installation cavity is opposite to the moving contact point of the moving contact moved to the disconnected position along the direction d1.

[0017] The arc extinguishing system of the present invention has an arc extinguishing chamber that is entirely located inside the arc extinguishing system shell, which improves the airtightness of the space in which the arc extinguishing chamber is located, is beneficial to increasing the arc pressure, and thus improving the arc extinguishing performance; secondly, the exhaust duct cooperates with the exhaust port of the installation cavity to ensure that the gas in the arc extinguishing system is discharged in an orderly manner; thirdly, the position of the exhaust port of the installation cavity is beneficial to prolonging the dwelling time of the arc in the arc extinguishing chamber, ensuring that the arc is fully extinguished, thereby eliminating or significantly reducing the possibility of unextinguished arc escaping from the arc extinguishing system.

[0018] In addition, the shape design of the exhaust duct is conducive to guiding the gas discharged from the arc extinguishing chamber to the exhaust port of the installation cavity for discharge in an orderly manner, ensuring that the gas is fully and reliably discharged from the arc extinguishing system.

[0019] In addition, the gas generating plate generates gas under the burning of the arc, which is beneficial to promoting the arc to enter between the arc extinguishing grids of the arc extinguishing chamber and cool the arc, thereby improving the arc extinguishing efficiency.

[0020] In addition, the moving contact arc-starting plate and the moving contact are at the same potential, which is beneficial to increasing the speed of arc transfer from the moving contact to the moving contact arc-starting plate when the moving contact and the static contact are separated, effectively protecting the moving contact and improving the breaking capacity of the contact system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of the switch device of the utility model;

[0022] Figure 2 This is an exploded view of the switch device of the present invention;

[0023] Figure 3 This is a cross-sectional view of the switchgear of the utility model in the open state;

[0024] Figure 4 It is a cross-sectional view of the switch device of the utility model in the closed state;

[0025] Figure 5 This is an exploded view of the housing of the utility model;

[0026] Figure 6 This is a structural diagram of one implementation of the arc extinguishing chamber of the utility model;

[0027] Figure 7 It is a structural diagram of another implementation method of the arc extinguishing chamber of the utility model.

[0028] Description of Reference Numerals

[0029] Housing 1a, first outer half shell 1-1a, second outer half shell 1-2a;

[0030] Inner shell 2a, first inner half shell 2-1a, first half cavity 2-14a, second inner half shell 2-2a, second half cavity 2-24a, arc extinguishing chamber installation cavity 2-3a, installation cavity inlet 2-4a, installation cavity exhaust port 2-5a, static contact socket 2-6a;

[0031] Handle 1b;

[0032] Anti-force closing mechanism 4b;

[0033] Anti-strong pulling mechanism 5b;

[0034] Operating mechanism 7b;

[0035] Electric reclosing mechanism 8b;

[0036] Thermal trip mechanism 9b;

[0037] Magnetic tripping mechanism 10b;

[0038] Contact system 11b, moving contact 11-1b, moving contact plate 11-11b, moving contact point 11-12b, stationary contact 11-2b, stationary contact point 11-21b, stationary contact plate 11-22b;

[0039] Arc extinguishing mechanism 12b, arc extinguishing chamber 12-1b, arc extinguishing grid 12-11b, arc extinguishing chute 12-12b, gas generating plate 12-13b, moving contact arc striking plate 12-2b, first matching section 12-21b, first middle section 12-22b, first tail section 12-23b, static contact arc striking plate 12-3b, second matching section 12-31b, second middle section 12-32b, second tail section 12-33b, freeing plate 12-4b, exhaust duct 12-5b, first exhaust duct section 12-51b, second exhaust duct section 12-52b;

[0040] Manganese copper shunt 13b;

[0041] First connecting plate 14b;

[0042] Equipotential column 16b;

[0043] Second connecting plate 1c;

[0044] Circuit board device p;

[0045] First circuit board assembly 1p;

[0046] Second circuit board assembly 2p, second circuit board 2-1p, first sampling terminal 2-4p. DETAILED DESCRIPTION

[0047] The following embodiments are combined with the accompanying drawings to further illustrate the specific implementation of the switch device of the present invention. The switch device of the present invention is not limited to the description of the following embodiments.

[0048] The utility model discloses a switch device, specifically a circuit breaker. Further, the circuit breaker is a plug-in circuit breaker. Further, the circuit breaker is a 1U circuit breaker.

[0049] like Figure 1-5 The figure shows an embodiment of the switch device of the present invention. The switch device of this embodiment is a single-pole switch device, which includes a housing and a first circuit and a second circuit disposed within the housing. The first circuit is a negative circuit, and the first circuit preferably includes a breakpoint (e.g., a breakpoint that can be opened and closed, composed of a moving contact and a static contact), that is, the conduction and disconnection of the first circuit can be controlled by controlling the closing and opening of the breakpoint. The second circuit is a positive circuit, and the second circuit is preferably a straight-through circuit. "Straight-through circuit" means that there is no breakpoint (e.g., a breakpoint that can be opened and closed, composed of a moving contact and a static contact) in the second circuit, and it always remains in a conducting state. Furthermore, in actual use of the switch device of this embodiment, the two ends of the first circuit are used to connect the negative conductor on the power supply side and the negative conductor on the load side, and the two ends of the second circuit are used to connect the positive conductor on the power supply side and the positive conductor on the load side, respectively.

[0050] Furthermore, the length direction, width direction and height direction of the switch device of the present invention are direction d1, direction d2 and direction d3 respectively, and direction d1, direction d2 and direction d3 are perpendicular to each other; the length direction, width direction and height direction of the shell are respectively the same as direction d1, direction d2 and direction d3.

[0051] Further, such as Figure 1-2 As shown, the housing includes an outer shell 1a, and the first and second circuits are both disposed within the outer shell 1a. The length, width, and height of the outer shell 1a are aligned with directions d1, d2, and d3, respectively. Specifically, the outer shell 1a includes a first outer half shell 1-1a and a second outer half shell 1-2a that are assembled relative to each other along direction d2.

[0052] Further, such as Figure 1-5As shown, the first circuit includes an operating system, a contact system 11b and an arc extinguishing system, the operating system includes a handle 1b and an operating mechanism 7b, the handle 1b is slidably arranged in the housing (specifically, the handle 1b is slidably arranged in the housing 1a) and switches between the handle closing position and the handle opening position by reciprocating sliding, the contact system 11b includes a moving contact 11-1b and a static contact 11-2b used in conjunction with each other, the handle 1b is transmission-connected to the operating mechanism 7b, and the operating mechanism 7b is transmission-connected to the moving contact 11-1b; when the handle 1b slides to the handle closing position, the handle 1b is switched to the handle opening position by the operating mechanism 7b. b drives the moving contact 11-1b to the closed position and closes with the static contact 11-2b, i.e., the switch device completes the closing operation, and the operating mechanism 7b and the switch device switch from the open state to the closed state. When the handle 1b slides to the handle-open position, the handle 1b drives the moving contact 11-1b to the disconnected position through the operating mechanism 7b and disconnects from the static contact 11-2b, i.e., the switch device completes the opening operation, and the operating mechanism 7b and the switch device switch from the closed state to the open state. The arc extinguishing system cooperates with the contact system 11b to extinguish the arc generated by the closing and opening of the contact system 11b. The handle 1b is pressed by an external force to slide into the housing 1a and switch to the handle-closed position. The handle 1b is pulled by an external force to slide out of the housing 1a and switch to the handle-open position.

[0053] Further, such as Figure 3-4 As shown, the movable contact 11-1b and the stationary contact 11-2b are arranged opposite each other along direction d2. Specifically, the movable contact 11-1b includes a movable contact plate 11-11b and a movable contact point 11-12b. One end of the movable contact plate 11-11b is transmission-connected to the operating mechanism 7b, and the other end is provided with the movable contact point 11-12b. Specifically, the stationary contact 11-2b includes a stationary contact plate 11-22b and a stationary contact point 11-21b.

[0054] Further, such as Figure 2-4 As shown, the operating system also includes an electric reclosing mechanism 8b, which cooperates with the handle 1b or the operating mechanism 7b to drive the operating mechanism 7b to open or close the switch. The electric reclosing mechanism 8b facilitates the remote closing and opening of the switch device of the utility model.

[0055] Further, such as Figure 2-4As shown, the switch device also includes a first wiring component and a second wiring component disposed in the housing, wherein one of the first wiring component and the second wiring component is an outgoing wiring component and the other is an incoming wiring component; the first wiring component includes a first negative wiring component and a first positive wiring component, and the second wiring component includes a second negative wiring component and a second positive wiring component, the first negative wiring component and the second negative wiring component are respectively connected in series at both ends of a first circuit (i.e., a negative circuit), that is, the first circuit is connected to a corresponding external circuit via the first negative wiring component and the second negative wiring component, the first positive wiring component and the second positive wiring component are respectively connected in series at both ends of a second circuit (i.e., a positive circuit / through circuit), and the second circuit is connected to a corresponding external circuit via the first positive wiring component and the second positive wiring component.

[0056] Specifically, the first and second wiring components are respectively arranged at two ends of the housing, the first wiring component is an outgoing wiring component, and the second wiring component is an incoming wiring component. The second wiring component is a plug-in wiring component, such as a busbar clamp.

[0057] Further, such as Figure 2 As shown, the first circuit further includes a first connecting plate 14b, a first negative electrode connecting member, the first connecting plate 14b, the contact system 11b, and a second negative electrode connecting member, which are sequentially connected in series. Specifically, the first negative electrode connecting member, the first connecting plate 14b, the movable contact 11-1b, the static contact 11-2b, and the second negative electrode connecting member are sequentially connected in series. Furthermore, the first connecting plate 14b is a metal conductive plate.

[0058] Further, such as Figure 2 As shown, the first circuit further includes a manganese-copper shunt 13b, which is preferably connected in series between the contact system 11b and the second negative terminal component.

[0059] Further, such as Figure 2 As shown, the second circuit further includes a second connecting plate 1c, and the first positive electrode wiring component, the second connecting plate 1c and the second positive electrode wiring component are sequentially connected in series. Further, the second connecting plate 1c is a metal conductive plate.

[0060] Further, such as Figure 2-4 As shown, the operating system also includes a thermal trip mechanism 9b and / or a magnetic trip mechanism 10b. The thermal trip mechanism 9b and / or the magnetic trip mechanism 10b are used to trip the operating mechanism 7b when an overload fault and / or a short circuit fault occurs in the circuit where the switching device is located (which is also the circuit where the contact system 11b, the moving contact 11-1b, and the static contact 11-2b are located).

[0061] Further, such as Figure 2-4As shown, the operating system further includes a circuit board device p, which is used to be connected to the electric reclosing mechanism 8b for control.

[0062] Specifically, the circuit board device p includes a first circuit board assembly 1p and a second circuit board assembly 2p in communication connection. Furthermore, the circuit board device p also includes a first sampling terminal 2-4p and a second sampling terminal. The first sampling terminal 2-4p is used to plug and electrically connect to the first connecting plate 14b of the first circuit, and the second sampling terminal is used to plug and electrically connect to the second connecting plate 1c of the second circuit to obtain operating power. Furthermore, the first sampling terminal 2-4p and the second sampling terminal are both disposed on the second circuit board 2-1p of the second circuit board assembly 2p.

[0063] Further, such as Figure 1-2 As shown, the switch device of the present invention further includes an anti-forced closing mechanism 4b, which is used to prevent the switch device of the present invention from closing when the switch device of the present invention is not installed in the installation position or is installed in the installation position but not installed in place.

[0064] Further, such as Figure 1-2 As shown, the switch device of the present invention further includes an anti-force pulling mechanism 5b. After the switch device of the present invention is installed in the installation position, the anti-force pulling mechanism 5b is used to prevent the switch device of the present invention from being pulled out of the installation position in the closed state.

[0065] The following will be combined Figure 2-6 As shown, the arc extinguishing system is described in detail:

[0066] The arc extinguishing system 12b includes an arc extinguishing system shell and an arc extinguishing mechanism 12b arranged in the arc extinguishing system shell. The arc extinguishing mechanism 12b includes an arc extinguishing chamber 12-1b. The arc extinguishing system shell includes an arc extinguishing chamber installation cavity 2-3a for accommodating the arc extinguishing chamber 12-1b, an installation cavity inlet 2-4a and an installation cavity exhaust port 2-5a. The arc extinguishing chamber installation cavity 2-3a is connected to the external environment only through the installation cavity inlet 2-4a and the installation cavity exhaust port 2-5a. The installation cavity inlet 2-4a is used for one end of the moving contact 11-1b provided with the moving contact 11-12b to pass through and enter. Into the arc extinguishing chamber installation cavity 2-3a, that is, one end of the moving contact 11-1b with the moving contact 11-12b passes through the installation cavity inlet 2-4a and enters the arc extinguishing chamber installation cavity 2-3a and cooperates with the arc extinguishing chamber 12-1b, a part of the moving contact 11-1b (specifically a part of the moving contact plate 11-11b) moves in the installation cavity inlet 2-4a, and one end of the static contact 11-2b with the static contact 11-21b is placed in the arc extinguishing chamber installation cavity 2-3a to cooperate with the arc extinguishing chamber 12-1b and the moving contact 11-1b, the moving contact 11 -12b and the static contact 11-21b close and open the arc will enter the arc extinguishing chamber 12-1b and be extinguished. One end of the arc extinguishing chamber 12-1b is relatively connected to the installation cavity inlet 2-4a and this end is the arc entrance end, and the other end is relatively connected to the installation cavity exhaust port 2-5a and this end is the exhaust end. The installation cavity inlet 2-4a, the arc entrance end, the exhaust end and the installation cavity exhaust port 2-5a are arranged in sequence along the direction d1; the arc extinguishing chamber 12-1b includes two or more arc extinguishing grids 12-11b, each arc extinguishing grid 12-11b is arranged in the direction d 2 are arranged side by side in sequence; the arc extinguishing system further includes an exhaust duct 12-5b arranged in the arc extinguishing system shell and located between the exhaust end and the installation cavity exhaust port 2-5a; in the direction d2, the exhaust duct 12-5b extends from one end of the arc extinguishing chamber 12-1b to the other end, that is, the entire exhaust end of the arc extinguishing chamber 12-1b is opposite to the exhaust duct 12-5b, and the installation cavity exhaust port 2-5a is relatively connected to one end of the exhaust duct 12-5b; one end of the exhaust duct 12-5b in the direction d2 is arranged opposite to the installation cavity exhaust port 2-5a along the direction d1. Furthermore, the installation cavity exhaust port 2-5a is also used to be opposite to the moving contact 11-12b of the moving contact 11-1b that moves to the disconnect position along the direction d1, that is, after the moving contact 11-1b moves to the disconnect position, its moving contact 11-12b is opposite to the installation cavity exhaust port 2-5a along the direction d1 (in other words, the position of the installation cavity exhaust port 2-5a is opposite to the moving contact 11-12b of the moving contact 11-1b that moves to the disconnect position along the direction d1).

[0067] The arc extinguishing system has the following advantages: 1. The arc extinguishing chamber 12-1b is located as a whole in the arc extinguishing system shell, which improves the airtightness of the space where the arc extinguishing chamber 12-1b is located, which is conducive to increasing the arc pressure and thus improving the arc extinguishing performance; 2. The exhaust duct 12-5b cooperates with the installation cavity exhaust port 2-5a to ensure that the gas in the arc extinguishing system is discharged in an orderly manner; 3. The position of the installation cavity exhaust port 2-5a is conducive to prolonging the dwelling time of the arc in the arc extinguishing chamber 12-1b, ensuring that the arc is fully extinguished, thereby eliminating or significantly reducing the possibility of unextinguished arc escaping from the arc extinguishing system; 4. The setting method of the static contact 11-2b is conducive to increasing the minimum gap between the static contact 11-2b and the moving contact 11-1b when they are disconnected, thereby improving the breaking capacity of the contact system 11b.

[0068] Specifically, such as Figure 3-4 In the direction shown, the exhaust duct 12-5b extends in the left-right direction (i.e., direction d2), and the right end of the exhaust duct 12-5b (the end of the exhaust duct 12-5b in the direction d2) is arranged opposite to the installation cavity exhaust port 2-5a in the up-down direction (i.e., direction d1).

[0069] Furthermore, the planes where the arc-quenching grids 12-11b are located are perpendicular to the direction d2 and parallel to the directions d1 and d3; or, the arc-quenching grids 12-11b are tilted, for example, the arc-quenching grids 12-11b are tilted relative to the directions d1 and d2 and parallel to the direction d3.

[0070] Further, such as Figure 3-4 As shown, the exhaust duct 12-5b includes a first exhaust duct section 12-51b and a second exhaust duct section 12-52b arranged in sequence and connected along direction d2. One end of the first exhaust duct section 12-51b is the exhaust duct first end, and the other end is connected to one end of the second exhaust duct section 12-52b. The width of the first exhaust duct section 12-51b along direction d1 gradually increases from the exhaust duct first end to the other end of the first exhaust duct section 12-51b. The installation cavity exhaust port 2-5a is relatively connected to the second exhaust port section 12-52b along direction d1. In direction d2, the length of the first exhaust duct section 12-51b is greater than or equal to the length of the second exhaust duct section 12-52b. Furthermore, the width of the second exhaust duct section 12-52b in direction d1 remains unchanged.

[0071] Specifically, on the projection of the arc extinguishing system perpendicular to the direction d3, the first section 12-51b of the exhaust duct is a wedge-shaped structure as a whole, the second section 12-52b of the exhaust duct is a rectangular structure as a whole, and the large diameter end of the first section 12-51b of the exhaust duct is connected to the second section 12-52b of the exhaust duct.

[0072] The shape design of the exhaust duct 12-5b and the structure from narrow to wide have a guiding function, which is conducive to the gas discharged from the arc extinguishing chamber 12-1b to be stably and orderly guided to the exhaust port 2-5a of the installation cavity for discharge, ensuring that the gas is fully and reliably discharged from the arc extinguishing system, reducing the pressure accumulation at the bottom of the exhaust end of the arc extinguishing chamber, and making the arc enter the arc extinguishing grid 12-11b of the arc extinguishing chamber 12-1b more smoothly, so that the arc can be cut by the arc extinguishing grid 12-11b more quickly, thereby improving the arc extinguishing efficiency.

[0073] Further, such as Figure 3-4 As shown, the arc extinguishing mechanism 12b further includes a stray arc extinguishing plate 12-4b arranged in the installation cavity exhaust 2-5a, and the stray arc extinguishing plate 12-4b further prevents the stray arc from being discharged from the arc extinguishing system 12b through the installation cavity exhaust port 2-5a.

[0074] Further, such as Figure 3-4 As shown, the arc extinguishing mechanism 12b also includes a moving contact arc-strike plate 12-2b and a static contact arc-strike plate 12-3b. One end of the moving contact arc-strike plate 12-2b and the static contact arc-strike plate 12-3b are side by side with the arc extinguishing chamber 12-1b along the direction d2 and are respectively arranged on both sides of the arc extinguishing chamber 12-1b in the direction d2 and are arranged side by side with the arc extinguishing grid 12-11b. The moving contact arc-strike plate 12-2b is used to cooperate with the moving contact 11-1b that moves to the disconnect position, and the other end of the static contact arc-strike plate 12-3b is used to cooperate with the static contact 11-2b. Furthermore, one end of the moving contact arc-starting plate 12-2b and the static contact arc-starting plate 12-3b are respectively side by side with the arc-extinguishing chamber 12-1b along direction d2 and are located on both sides of the arc-extinguishing chamber 12-1 in direction d2, and the other ends are inclined toward the middle of the arc entrance end along direction d2 and the two are inclined toward each other.

[0075] Specifically, one end of the moving contact arc-starting plate 12-2b is arranged side by side with the arc extinguishing chamber 12-1b and the other end is in contact with the moving contact 11-1b that moves to the disconnected position. Furthermore, the moving contact arc-starting plate 12-2b includes a first matching section 12-21b, and the first matching section 12-21b is used to be parallel to and in contact with the moving contact 11-1b that moves to the disconnected position. Furthermore, the moving contact arc-starting plate 12-2b also includes a first middle section 12-22b that is bent and connected to the first matching section 12-21b; the moving contact 11-1b also includes a moving contact arc-starting angle, and the first middle section 12-22b is used to fit the moving arc-starting angle of the moving contact 11-1b that moves to the disconnected position. The first mating section 12-21b and the first middle section 12-22b cooperate with the moving contact 11-1b, which is conducive to the transfer of the arc from the moving contact 11-1b to the moving contact arc-starting plate 12-2b, thereby reducing the burning of the moving contact 11-1b. Furthermore, the moving contact arc-starting plate 12-2b also includes a first tail section 12-23b, the first mating section 12-21b, the first middle section 12-22b and the first tail section 12-23b are bent and connected in sequence, and the first tail section 12-23b is arranged parallel to the arc-extinguishing grid 12-11b of the arc-extinguishing chamber 12-1b at intervals, and the first mating section 12-21b, the first middle section 12-22b and the first tail section 12-23b are arranged in sequence in the direction d1 and It is arranged gradually close to the arc extinguishing chamber 12-1b, one end of the first middle section 12-22b is connected to the first tail section 12-23b and the other end is inclined toward the middle of the arc entrance end of the arc extinguishing chamber 12-1b relative to the first tail section 12-23b in the direction d2, and one end of the first matching section 12-21b is connected to the first middle section 12-22b and the other end is inclined toward the middle of the arc entrance end of the arc extinguishing chamber 12-1b relative to the first middle section 12-22b in the direction d2.

[0076] As another embodiment of the movable contact arc striking plate 12-2b, the movable contact 11-1b is not provided with a movable contact arc striking angle, and the first mating section 12-21b and the first intermediate section 12-22b are coplanar. In addition, due to the size limitation of the arc extinguishing chamber, the first mating section 12-21b and the first intermediate section 12-22b can also be coplanar and mated with the movable contact 11-1b. The structure of the movable contact 11-1b is also changed accordingly. Those skilled in the art can make such configurations as needed, and this will not be elaborated here.

[0077] Specifically, one end of the static contact arc-starting plate 12-3b is arranged side by side with the arc extinguishing chamber 12-1b and the other end is connected to the static contact 11-2b, which is conducive to the arc being transferred from the static contact 11-2b to the static contact arc-starting plate 12-3b as soon as possible to reduce the burning of the static contact 11-2b. Furthermore, the static contact arc-starting plate includes a second matching section 12-31b, a second middle section 12-32b and a second tail section 12-33b, the second matching section 12-31b is connected to the static contact plate 11-22b of the static contact 11-2b (specifically, the first section 11-221b of the static contact plate 11-22b provided with the static contact point 11-21b) and contacts the static contact 11-21b, the second tail section 12-33b is arranged in parallel with the arc-extinguishing grid 12-11b of the arc-extinguishing chamber 12-1b, and the second matching section 12-31b, the second middle section 12-32b and the second tail section 12-33b are arranged in parallel with the arc-extinguishing grid 12-11b of the arc-extinguishing chamber 12-1b. The second middle section 12-32b and the second tail section 12-33b are arranged in sequence in the direction d1 and gradually approach the arc extinguishing chamber 12-1b. One end of the second middle section 12-32b is connected to the second tail section 12-33b and the other end is inclined relative to the second tail section 12-33b in the direction d2 toward the middle of the arc entrance end of the arc extinguishing chamber 12-1b. One end of the second matching section 12-31b is connected to the second middle section 12-32b and the other end is inclined relative to the second middle section 12-32b in the direction d2 toward the middle of the arc entrance end of the arc extinguishing chamber 12-1b.

[0078] As another embodiment of the static contact arc striking plate 12-3b, the second mating section 12-31b and the second middle section 12-32b are coplanar.

[0079] Further, such as Figure 2-4 As shown, the moving contact arc-starting plate 12-2b is also used to electrically connect with the circuit where the moving contact 11-1b and the static contact 11-2b (that is, the contact system 11b) are located, so that the moving contact arc-starting plate 12-2b and the moving contact 11-1b are at the same potential. When the moving contact 11-1b and the static contact 11-2b are separated, it is beneficial to increase the speed of the arc transferring from the moving contact 11-1b to the moving contact arc-starting plate 12-2b, effectively protect the moving contact 11-1b, and improve the breaking capacity of the contact system 11b.

[0080] Specifically, the switch device of the present invention also includes an equipotential member, one end of which is electrically connected to the moving contact arc-starting plate 12-2b and the other end is electrically connected to the circuit board device p. Furthermore, the equipotential member is an equipotential column 16b, one end of which is electrically connected to the moving contact arc-starting plate 12-2b and the other end is electrically connected to the circuit board device p. The equipotential column 16b has a simple structure and is easy to install. Furthermore, the equipotential column 16b extends along direction d2, and the moving contact arc-starting plate 12-2b, the equipotential column 16b, and the second circuit board 2-1p of the second circuit board assembly 2p of the circuit board device p are arranged in sequence along direction d2. The equipotential column 16b has one end electrically connected to the moving contact arc-starting plate 12-2b and the other end is electrically connected to the second circuit board 2-1p. Furthermore, the first sampling terminal 2-4p of the circuit board device p, the second circuit board 2-1p, the equipotential member and the moving contact arc-starting plate 12-2b are electrically connected in sequence, thereby achieving the equipotentiality of the moving contact arc-starting plate 12-2b and the moving contact 11-1b (contact system 11b); the equipotentiality of the moving contact arc-starting plate 12-2b and the moving contact 11-1b can enable the arc to be drawn to the moving contact arc-starting plate more quickly and can improve the arc extinguishing effect. The reason for this is that during the process from the opening of the moving contact 11-1b to the movement of the moving contact 11-1b to the contact with the moving contact arc-starting plate 12-2b, if the moving contact arc-starting plate 12-2b and the moving contact 11-1b are not at the same potential, or the arc remains at the moving contact 11-12b, or the arc transfer is slow, it will not only burn the moving contact 11-12b, but also affect the efficiency of the arc being cut by the arc-extinguishing grid 12-11b of the arc-extinguishing chamber 12-1b. Furthermore, the second circuit board 2-1p is provided with a printed circuit, which is electrically connected to the first sampling terminal 2-4p and is electrically connected to the equipotential contact.

[0081] As another embodiment of the equipotential member, the equipotential member is a wire, both ends of which are electrically connected to the moving contact arc-starting plate 12 - 2b and the circuit board device p respectively.

[0082] Further, such as Figure 3-4 As shown in Figures 6 and 7, the arc-extinguishing chamber 12-1b further includes arc-extinguishing chute plates 12-12b spaced side by side in a direction d3. Each arc-extinguishing grid 12-11b is disposed between two arc-extinguishing chute plates 12-12b and each arc-extinguishing grid 12-11b is fixedly connected to the two arc-extinguishing chute plates 12-12b. Furthermore, the moving contact arc-strike plate 12-2b is disposed between the two arc-extinguishing chute plates 12-12b in a direction d3, and one end (specifically, the first tail section of the moving contact arc-strike plate 12-2b) is fixedly connected to the two arc-extinguishing chute plates 12-12b.

[0083] As another embodiment of the arc extinguishing chamber 12-1b, the arc extinguishing chamber 12-1b is not provided with an arc extinguishing chute 12-12b, but the arc extinguishing grid 12-11b is directly fixed on the side wall of the arc extinguishing chamber installation cavity 2-3a of the arc extinguishing system shell.

[0084] Further, such as Figure 6 As shown, the arc extinguishing chamber 12-1b also includes two gas-producing plates 12-13b spaced relative to each other along direction d3. A movement gap is formed between the two gas-producing plates 12-13b for inserting and moving one end of the moving contact 11-1b provided with the moving contact 11-12b therein. The arc extinguishing grid 12-11b includes two grid pins spaced relative to each other along direction d3, with the two grid pins located on either side of the two gas-producing plates 12-13b. The gas-producing plates 12-13b generate gas under the burning of the arc, which helps promote the arc to enter between the arc extinguishing grids 12-11b of the arc extinguishing chamber 12-1b and cool the arc, thereby improving arc extinguishing efficiency. Furthermore, the gas-producing plates 12-13b are provided with grid pin slots into which the grid pins are inserted and which cooperate with the grid pins one-to-one.

[0085] As other embodiments of the arc extinguishing chamber 12-1b, Figure 7 As shown, the arc-extinguishing chamber 12-1b is not provided with an arc-extinguishing chute 12-12b. Instead, the arc-extinguishing grids 12-11b of the arc-extinguishing chamber 12-1b are directly fixed to the two gas-generating plates 12-13b. A pair of side edges of each arc-extinguishing grid 12-11b are fixedly connected or snap-fitted to the two gas-generating plates 12-13b. Furthermore, a pair of side edges of the first tail section 12-23b of the moving contact arc-starting plate 12-2b are also fixed to the two gas-generating plates 12-13b.

[0086] Furthermore, the two gas production plates 12 - 13 b are an integrated structure.

[0087] Furthermore, an arc extinguishing grid opening is formed between the two grid feet of the arc extinguishing grid 12-11b, and the bottom surface of the arc extinguishing grid opening (that is, the side surfaces of the arc extinguishing grid opening respectively connected to the two grid feet) is a slope, and the end of the bottom surface connected to one grid foot is offset toward the exhaust end of the arc extinguishing chamber 12-1b relative to the end of the bottom surface connected to the other grid foot. The bottom surfaces of the arc extinguishing grid openings of adjacent arc extinguishing grids are cross-arranged, which is beneficial to reducing the resistance of the arc entering between the arc extinguishing grids 12-11b, so that the arc entering between the arc extinguishing grids 12-11b is cut, and the number of types of arc extinguishing grids in the arc extinguishing chamber 12-1b can be reduced.

[0088] Further, such as Figure 2 、 5As shown, the shell of the switch device of the present invention also includes an inner shell 2a arranged in the outer shell 1a, and at least an arc extinguishing mechanism 12b of the arc extinguishing system is provided in the inner shell 2a, that is, the inner shell 2a serves as the arc extinguishing system shell of the arc extinguishing system. The inner shell 2a can be used only to accommodate the arc extinguishing mechanism, and can also be used to accommodate more components including the arc extinguishing mechanism (such as the operating mechanism 7b, the contact system 11b, the thermal tripping mechanism 9b, the magnetic tripping mechanism 10b, the electric reclosing mechanism 8b and the first circuit board assembly 1p of the circuit board device p). The operating mechanism 7b, the electric reclosing mechanism 8b, the thermal tripping mechanism 9b, the magnetic tripping mechanism 10b and the arc extinguishing mechanism of the arc extinguishing system are first installed in the inner shell 2a, and then installed in the outer shell 1a as a whole, which is conducive to improving installation efficiency. Furthermore, the operating mechanism 7b, electric reclosing mechanism 8b, thermal trip mechanism 9b, magnetic trip mechanism 10b, contact system 11b, arc extinguishing mechanism 12b of the arc extinguishing system, and first circuit board assembly 1p are all disposed within the inner housing 2a. The handle 1b, first wiring device, second wiring device, manganese-copper shunt 13b, first connecting plate 14b, second connecting plate 1c, second circuit board assembly 2p of the circuit board assembly p, anti-force closing mechanism 4b, and anti-force pulling mechanism 5b are all disposed outside the inner housing 2a and within the outer housing 1a. Furthermore, the inner housing 2a comprises a first inner half-shell 2-1a and a second inner half-shell 2-2a, which are joined relative to each other along direction d3. Furthermore, the arc extinguishing chamber installation cavity 2-3a includes a first half cavity 2-14a arranged in the first inner half shell 2-1a and a second half cavity 2-24a arranged in the second inner half shell 2-2a, and the first half cavity 2-14a and the second half cavity 2-24a are relatively spliced ​​together along the direction d3 to form the arc extinguishing chamber installation cavity 2-3a; the installation cavity inlet 2-4a is composed of a first inlet groove arranged in the first inner half shell 2-1a and a second inlet groove arranged in the second inner half shell 2-2a, which are relatively spliced ​​together along the direction d3; the installation cavity exhaust port 2-5a is composed of a first outlet groove arranged on the first inner half shell 2-1a and a second outlet groove arranged on the second inner half shell 2-2a, which are relatively spliced ​​together along the direction d3.

[0089] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, or are conventionally placed directions or positional relationships during use. They are intended solely for ease of description and do not imply that the devices or components referred to must have a specific direction. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely for distinction and description and should not be construed as indicating relative importance.

[0090] The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. An arc extinguishing system, comprising an arc extinguishing system housing and an arc extinguishing mechanism (12b) arranged in the arc extinguishing system housing, the arc extinguishing mechanism (12b) comprising an arc extinguishing chamber (12-1b), the arc extinguishing system housing comprising an arc extinguishing chamber installation cavity (2-3a), an installation cavity inlet (2-4a) and an installation cavity exhaust port (2-5a), the arc extinguishing chamber installation cavity (2-3a) being in communication with the external environment only through the installation cavity inlet (2-4a) and the installation cavity exhaust port (2-5a), the installation cavity inlet (2-4a) being used for allowing one end of a moving contact (11-1b) provided with a moving contact point (11-12b) to pass through and enter the arc extinguishing chamber installation cavity (2-3a), the arc extinguishing chamber (12 -1b) and one end of the static contact (11-2b) provided with the static contact point (11-21b) are both arranged in the arc extinguishing chamber installation cavity (2-3a); one end of the arc extinguishing chamber (12-1b) is relatively communicated with the installation cavity inlet (2-4a) and serves as the arc entrance end, and the other end is relatively communicated with the installation cavity exhaust port (2-5a) and serves as the exhaust end; the installation cavity inlet (2-4a), the arc entrance end, the exhaust end and the installation cavity exhaust port (2-5a) are arranged in sequence along direction d1; the arc extinguishing chamber (12-1b) comprises at least two arc extinguishing grids (12-11b) arranged in sequence side by side along direction d2, and the direction d1 is perpendicular to the direction d2; Its characteristics are: The arc extinguishing system further comprises an exhaust duct (12-5b) arranged in the arc extinguishing system shell and located between the exhaust end and the installation cavity exhaust port (2-5a); in the direction d2, the exhaust duct (12-5b) extends from one end of the arc extinguishing chamber (12-1b) to the other end, and the installation cavity exhaust port (2-5a) is relatively connected to one end of the exhaust duct (12-5b); one end of the exhaust duct (12-5b) in the direction d2 is arranged relative to the installation cavity exhaust port (2-5a) along the direction d1.

2. The arc extinguishing system according to claim 1, characterized in that: The exhaust duct (12-5b) comprises a first section (12-51b) and a second section (12-52b) of the exhaust duct, which are arranged in sequence and connected along a direction d2; one end of the first section (12-51b) of the exhaust duct is the first end of the exhaust duct, and the other end is connected to one end of the second section (12-52b) of the exhaust duct; the width of the first section (12-51b) of the exhaust duct along the direction d1 gradually increases from the first end of the exhaust duct to the other end of the first section (12-51b) of the exhaust duct; the exhaust port (2-5a) of the installation cavity is relatively connected to the second section (12-52b) of the exhaust duct along the direction d1; and in the direction d2, the length of the first section (12-51b) of the exhaust duct is greater than or equal to the length of the second section (12-52) of the exhaust duct.

3. The arc extinguishing system according to claim 1, characterized in that: The arc extinguishing mechanism (12b) further comprises a moving contact arc striking plate (12-2b) and a stationary contact arc striking plate (12-3b); one end of the moving contact arc striking plate (12-2b) and the stationary contact arc striking plate (12-3b) are respectively arranged on both sides of the arc extinguishing chamber (12-1b) along a direction d2 and arranged side by side with the arc extinguishing grid (12-11b); the other end of the moving contact arc striking plate (12-2b) is used to cooperate with the moving contact (11-1b) moved to the disconnected position; and the other end of the stationary contact arc striking plate (12-3b) is used to cooperate with the stationary contact (11-2b).

4. The arc extinguishing system according to claim 3, characterized in that: The moving contact arc-striking plate (12-2b) comprises a first matching section (12-21b), the first matching section (12-21b) being used to be parallel to and in contact with the moving contact (11-1b) moved to the disconnected position; one end of the stationary contact arc-striking plate (12-3b) is arranged side by side with the arc-extinguishing grid (12-11b) along a direction d2, and the other end is used to be connected to the stationary contact (11-2b).

5. The arc extinguishing system according to claim 3, characterized in that: One end of the moving contact arc striking plate (12-2b) and the static contact arc striking plate (12-3b) are respectively arranged side by side with the arc extinguishing chamber (12-1b) along the direction d2 and are respectively located on both sides of the arc extinguishing chamber (12-1b) in the direction d2, and the other end are both inclined toward the middle of the arc entrance end along the direction d2.

6. The arc extinguishing system according to claim 3, characterized in that: The moving contact arc-starting plate (12-2b) is also used to be electrically connected to the circuit where the moving contact (11-1b) and the static contact (11-2b) are located.

7. The arc extinguishing system according to claim 1, characterized in that: The arc extinguishing system housing further comprises a static contact jack (2-6a) arranged on a side wall of the installation cavity inlet (2-4a); one end of the static contact (11-2b) provided with a static contact point (11-21b) passes through the static contact jack (2-6a) and enters the arc extinguishing chamber installation cavity (2-3a); and the arc extinguishing mechanism (12b) further comprises a deionization plate (12-4b) arranged in the installation cavity exhaust port (2-5a).

8. The arc extinguishing system according to claim 3, characterized in that: The arc extinguishing chamber (12-1b) further comprises arc extinguishing chute plates (12-12b) arranged side by side and spaced apart along direction d3; each arc extinguishing grid plate (12-11b) is arranged between two arc extinguishing chute plates (12-12b), and each arc extinguishing grid plate (12-11b) is respectively fixedly connected to the two arc extinguishing chute plates (12-12b); the directions d1, d2 and d3 are perpendicular to each other; the moving contact arc striking plate (12-2b) is arranged between the two arc extinguishing chute plates (12-12b) in direction d3, and one end thereof is respectively fixedly connected to the two arc extinguishing chute plates (12-12b).

9. The arc extinguishing system according to claim 1, characterized in that: The arc extinguishing chamber (12-1b) further comprises two gas-producing plates (12-13b) arranged at a relative interval along a direction d3, wherein a moving gap is formed between the two gas-producing plates (12-13b) for inserting and moving one end of the moving contact (11-1b) provided with a moving contact point (11-12b); each of the arc extinguishing grids (12-11b) comprises two grid pins arranged at a relative interval along a direction d3, the two grid pins being located on both sides of the two gas-producing plates (12-13b); the directions d1, d2 and d3 are perpendicular to each other; and the gas-producing plates (12-13b) are provided with grid pin slots into which the grid pins are inserted and which cooperate with the grid pins in a one-to-one manner.

10. The arc extinguishing system according to claim 1, characterized in that: The position of the installation cavity exhaust port (2-5a) is opposite to the moving contact point (11-12b) of the moving contact (11-1b) moved to the disconnected position along the direction d1.

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