Arc extinguishing system and circuit breaker

Abstract

The arc extinguishing system comprises an arc extinguishing chamber, the arc extinguishing chamber is arranged in a shell of the circuit breaker, the shell is provided with an exhaust port, an exhaust channel is connected between the exhaust port and an exhaust end of the arc extinguishing chamber, two ends of the exhaust channel are communicated with the exhaust end and the exhaust port respectively, and the arc extinguishing system further comprises a pressure adjusting part. The pressure adjusting part is rotationally arranged in the exhaust channel and is driven by the air pressure difference between the exhaust channel and the exhaust end, so that the exhaust channel and the exhaust end are communicated or blocked. According to the utility model, through arranging the pressure adjusting member, the pressure adjusting member is driven by air pressure difference, so that the pressure adjusting member is rotated to be opened or the pressure adjusting member is reset to block the communication between the exhaust channel and the exhaust end, thereby preventing back-spraying high-temperature gas from entering the arc extinguish chamber or the circuit breaker from the exhaust channel, improving the product performance and prolonging the service life.

Description

Technical Field

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

[0002] A circuit breaker is a mechanical switching device that can close, carry and interrupt current under normal and abnormal circuit conditions. In existing molded case circuit breakers, when the arc flows in the arc extinguishing system, the high-temperature gas generated by the arc will cause the arc extinguishing grid to melt and form small particles. However, in the existing circuit breaker arc extinguishing system, small particles may get stuck in the key components of the circuit breaker when they are sprayed back, affecting the product and even damaging the product in severe cases. Summary of the invention

[0003] The utility model aims to overcome at least one defect of the prior art and provide an arc extinguishing system and a circuit breaker.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The utility model provides an arc extinguishing system, comprising an arc extinguishing chamber, wherein the arc extinguishing chamber is arranged inside a shell of a circuit breaker, wherein the shell is provided with an exhaust port, wherein an exhaust channel is connected between the exhaust port and the exhaust end of the arc extinguishing chamber, wherein the two ends of the exhaust channel are respectively connected with the exhaust end and the exhaust port, and further comprising a pressure regulating member, wherein the pressure regulating member is rotatably arranged in the exhaust channel, and wherein the pressure regulating member is driven by the air pressure difference between the exhaust channel and the exhaust end, so that the exhaust channel maintains connection with the exhaust end or blocks the connection.

[0006] Preferably, an inlet is provided at one end of the exhaust channel, and the inlet is connected to the side position of the exhaust end. The connecting end of the pressure regulating member is rotatably connected to one side of the inlet, and the movable end of the pressure regulating member cooperates with a side wall of the exhaust channel to open or close the inlet.

[0007] Preferably, the distance between the movable end and the connecting end of the pressure regulating member is greater than the inner diameter of the inlet, so that the movable end extends to the middle of the exhaust passage and moves in the exhaust passage.

[0008] Preferably, when the pressure regulating member covers the inlet, the angle between the line connecting the movable end and the connecting end and the end surface of the exhaust end is in the range of 50 to 80 degrees.

[0009] Preferably, the pressure regulating member is provided with a limit member, and the limit member cooperates with the side wall of the exhaust passage to limit the rotation range of the movable end.

[0010] Preferably, the exhaust channel is trumpet-shaped with one end being thicker and the other end being thinner, the end with a smaller inner diameter of the exhaust channel is correspondingly connected to the exhaust port, and the end with a larger inner diameter of the exhaust channel is provided with an inlet connected to the exhaust end.

[0011] Preferably, the inlet corresponds to the side position of the exhaust channel and the exhaust end, a side wall of the inlet extends along the outer side of the exhaust end as a partition, and the connecting end of the pressure regulating member is rotatably connected to the partition.

[0012] Preferably, a plurality of arc-extinguishing members arranged at intervals are mounted inside one end of the exhaust passage away from the arc-extinguishing chamber.

[0013] Preferably, each arc-extinguishing member is provided with a plurality of communicating holes, and the communicating holes of two adjacent arc-extinguishing members are staggered.

[0014] Preferably, the pressure regulating member includes a main body, one end of the main body is provided with a round shaft portion as a connecting end, the other end of the main body is used as a movable end, the surface of the movable end is protruding with an abutment portion, and a limiting member is connected to the main body, and at least one end of the limiting member is located on the side of the main body opposite to the abutment portion.

[0015] Preferably, the limit member is connected to the side of the main body facing away from the abutment portion, the limit member is a straight plate connected to the main body, and one end of the limit member is connected to the main body close to the connection end, and the other end of the limit member extends obliquely in a direction deviating from the main body, and the angle between the limit member and the main body ranges from 25 to 40°.

[0016] Preferably, a hollow area is provided in the middle of the body, one end of the limiting member is connected to the edge of the hollow area, and the other end of the limiting member passes through the hollow area and is located on a side of the body facing away from the abutting portion.

[0017] Preferably, the limiting member is formed by bending a strip plate to form a U-shaped portion, the U-shaped portion passes through the hollow area and is located on the same side of the main body as the abutment portion, and the hollow area reserves a space for the U-shaped portion to deform, one end of the U-shaped portion is connected to the edge of the hollow area away from the abutment portion, and the other end of the U-shaped portion extends in a direction away from the main body on the side of the main body opposite to the abutment portion, and the other end of the U-shaped portion is bent.

[0018] The utility model also provides a circuit breaker, comprising a shell, wherein a contact mechanism is arranged in the shell, and the arc extinguishing system as described above is arranged on one side of the contact mechanism.

[0019] Furthermore, an installation area is provided in the outer shell, one end of the installation area is connected to an exhaust port arranged at one end of the outer shell, a partition is provided in the middle of the installation area, and the partition divides the installation area into an arc extinguishing chamber and an exhaust channel, the arc extinguishing chamber is arranged in the arc extinguishing chamber, and the exhaust channel is connected between the exhaust port and the arc extinguishing chamber.

[0020] The arc extinguishing system and circuit breaker of the utility model are provided with a pressure regulating component in the exhaust passage. When the exhaust end discharges the exhaust gas, the air pressure difference drives the pressure regulating component to rotate and open, so that the exhaust gas enters the exhaust passage while the exhaust passage and the exhaust end remain connected. When the exhaust gas is discharged from the exhaust port, the air pressure difference decreases, so that the pressure regulating component is reset to block the connection between the exhaust passage and the exhaust end, thereby preventing the back-sprayed high-temperature gas from entering the arc extinguishing chamber or the inside of the circuit breaker from the exhaust passage, thereby improving product performance and extending service life.

[0021] In addition, the inlet of the exhaust passage is connected to the side of the exhaust end, so that the exhaust gas at the exhaust end is collected at the side position and then enters, which is conducive to controlling the rotation of the pressure regulating member through air pressure.

[0022] In addition, the length of the pressure regulating member is greater than the inner diameter of the inlet, so that the movable end extends into the exhaust passage, which not only ensures the barrier effect of the pressure regulating member, but also prevents the pressure regulating member from occupying additional space outside the arc extinguishing system.

[0023] In addition, the exhaust passage is trumpet-shaped as a whole, and in particular, the inlet corresponds to the side position of the end with a larger inner diameter. The area with a larger inner diameter can fully buffer the exhaust gas, and the inlet located at the side position can further prevent the gas from flowing back into the arc extinguishing chamber.

[0024] In addition, multiple arc extinguishing parts are arranged near the outlet of the exhaust duct to achieve zero arcing and improve the safety of product use. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the arc extinguishing system of the utility model;

[0026] Figure 2 It is an exploded diagram of the arc extinguishing system of the utility model;

[0027] Figure 3 It is a cross-sectional view of the pressure regulating member in the utility model;

[0028] Figure 4 It is a structural schematic diagram of the pressure regulating member in the utility model;

[0029] Figure 5 It is a schematic diagram of the movement of the pressure regulating member in the utility model;

[0030] Reference numerals:

[0031] 10-exhaust port, 11-base, 12-middle cover, 13-base, 2-arc extinguishing chamber, 20-arc extinguishing cavity, 3-exhaust channel, 31-inlet, 32-partition, 4-pressure regulating member, 41-connecting end, 42-movable end, 43-abutting portion, 44-limiting member, 45-hollow area, 5-arc extinguishing sheet. DETAILED DESCRIPTION

[0032] The following embodiments are given in conjunction with the accompanying drawings to further illustrate the specific implementation of the arc extinguishing system and circuit breaker of the utility model. The arc extinguishing system and circuit breaker of the utility model are not limited to the description of the following embodiments.

[0033] A circuit breaker comprises a shell, in which an operating mechanism and at least one circuit breaker pole are arranged, each circuit breaker pole comprises at least a pair of wiring components, a contact mechanism and an arc extinguishing system, the contact mechanism is connected between the pair of wiring components, the contact mechanism comprises a moving contact and a stationary contact that cooperate with each other, the operating mechanism drives the moving contact to contact or separate with the stationary contact, the moving contacts of two adjacent circuit breaker poles are linked and connected, thereby realizing the opening and closing of the circuit breaker, and the arc extinguishing system is arranged on one side of the contact mechanism for extinguishing the arc generated when the contact mechanism is disconnected.

[0034] Specifically, Figure 1 , 2 As shown, the arc extinguishing system includes an arc extinguishing chamber 2, an exhaust channel 3 and an exhaust port 10 arranged at one end of the shell, a plurality of arc extinguishing grids arranged at intervals are arranged between the arc entry end and the exhaust end of the arc extinguishing chamber 2, the arc entry end of the arc extinguishing chamber 2 is connected to the contact mechanism, and the exhaust channel 3 is connected between the exhaust end of the arc extinguishing chamber 2 and the exhaust port 10, that is, the two ends of the exhaust channel 3 are respectively connected with the exhaust end and the exhaust port 10, and the exhaust gas generated after the arc extinguishing chamber 2 is extinguished is discharged from the exhaust port 10 through the buffer of the exhaust channel 3.

[0035] The improvement of the present application is that it also includes a pressure regulating member 4, which is rotatably arranged in the exhaust channel 3, and the pressure regulating member 4 is driven by the air pressure difference between the exhaust channel 3 and the exhaust end, so that the exhaust channel 3 and the exhaust end remain connected or blocked, that is, the exhaust end of the arc extinguishing chamber 2 discharges exhaust gas, the air pressure at the exhaust end is greater than the air pressure in the exhaust channel 3, and an air pressure difference is generated between the exhaust end and the exhaust channel 3, driving the pressure regulating member 4 to rotate, so that the exhaust channel 3 and the exhaust end remain connected, so that the exhaust gas can enter the exhaust channel 3. When the exhaust gas in the exhaust channel 3 is discharged in large quantities, the air pressure in the exhaust channel 3 decreases, and the air pressure difference with the exhaust end decreases, and the pressure regulating member 4 rotates to its original position to block the connection between the exhaust channel 3 and the exhaust end.

[0036] In this way, by arranging the pressure regulating component 4 in the exhaust passage 3, when the exhaust end discharges the exhaust gas, the air pressure difference drives the pressure regulating component 4 to rotate and open, so that the exhaust gas enters the exhaust passage 3 while the exhaust passage 3 and the exhaust end remain connected. After the exhaust gas is discharged from the exhaust port 10, the air pressure difference decreases, so that the pressure regulating component 4 is reset to block the connection between the exhaust passage 3 and the exhaust end, thereby preventing the back-sprayed high-temperature gas from entering the arc extinguishing chamber 2 or the inside of the circuit breaker from the exhaust passage 3, thereby improving product performance and extending service life.

[0037] Preferably, an inlet 31 is provided at one end of the exhaust channel 3, and the inlet 31 is connected to the side position of the exhaust end. The connecting end 41 of the pressure regulating member 4 is rotatably connected to one side of the inlet 31, and the movable end 43 of the pressure regulating member 4 cooperates with a side wall of the exhaust channel 3 to open or cover the inlet 31. The exhaust gas discharged from the arc extinguishing chamber 2 is connected to the inlet 31 through the side position of the exhaust end, and the exhaust gas is first collected on one side and then enters the inlet 31, which is beneficial to drive the pressure regulating member 4 to rotate and improve its matching performance.

[0038] Furthermore, the distance between the movable end 43 of the pressure regulating member 4 and the connecting end 41 is greater than the inner diameter of the inlet 31, that is, the length of the pressure regulating member 4 is greater than the inner diameter of the inlet 31, so that the movable end 43 extends to the middle of the exhaust channel 3, and the movable end 43 moves inside the exhaust channel 3. When the arc extinguishing system is set in the circuit breaker, the pressure regulating member 4 does not need to occupy additional space inside the circuit breaker. At the same time, using a pressure regulating member 4 with a longer length can ensure its barrier effect.

[0039] Combination Figure 1-3 A specific embodiment of an arc extinguishing system is provided.

[0040] like Figure 1 , 2 As shown, the arc extinguishing system includes an arc extinguishing chamber 2, an exhaust channel 3, an exhaust port 10 and a pressure regulating member 4, wherein the arc extinguishing chamber 2 is arranged inside the housing of the circuit breaker, and the exhaust port 10 is opened on the housing of the circuit breaker, wherein the exhaust end of the arc extinguishing chamber 2 faces the exhaust port 10, the exhaust channel 3 is connected between the exhaust end and the exhaust port 10, and the pressure regulating member 4 is rotatably arranged in the exhaust channel 3 and driven to rotate by air pressure, that is, when the exhaust end discharges exhaust gas, under the action of the air pressure difference, the pressure regulating member 4 rotates to keep the exhaust channel 3 connected with the exhaust end so that the exhaust gas enters the exhaust channel 3, and when the exhaust gas in the exhaust channel 3 is discharged from the exhaust port 10, the air pressure in the exhaust channel 3 is reduced, and the pressure regulating member 4 is reset and blocks the connection between the exhaust channel 3 and the exhaust end again.

[0041] like Figure 1 , 2 As shown, the arc extinguishing chamber 2 can adopt the existing technology, one end of the arc extinguishing chamber 2 is an arc entry end provided with an arc entry port, the arc entry end of the arc extinguishing chamber 2 is used to cooperate with the contact mechanism of the circuit breaker, the arc entry end of the arc extinguishing chamber 2 is provided with an arc striking plate that cooperates with the contact mechanism, the other end of the arc extinguishing chamber 2 is an exhaust end connected to the exhaust channel 3, a plurality of arc extinguishing grids arranged at intervals are provided between the arc entry end and the exhaust end of the arc extinguishing chamber 2, an arc extinguishing gap is formed between two adjacent arc extinguishing grids, and the two ends of each arc extinguishing gap are connected to the arc entry end and the exhaust end. Figure 1 , 2In the embodiment, the arc extinguishing grids in the arc extinguishing chamber 2 near the side are shorter, and the exhaust end is connected to the exhaust channel 3 in the area where the arc extinguishing grids are shorter.

[0042] like Figure 1 As shown, the two ends of the exhaust channel 3 are respectively connected with the exhaust end of the arc extinguishing chamber 2 and the exhaust port 10 on the circuit breaker housing, and an inlet 31 is provided at one end of the exhaust channel 3. The inlet 31 of the exhaust channel 3 is connected to the side position of the exhaust end, that is, the inlet 31 is connected to the exhaust end position of the corresponding shorter arc extinguishing grid, and the other end of the exhaust channel 3 is connected to the exhaust port 10 as an outlet. In this embodiment, the exhaust channel 3 as a whole is a trumpet-shaped structure (or a duckbill-shaped structure) with one end thick and the other end thin. The end of the exhaust channel 3 with a smaller inner diameter is provided with an outlet and is connected to the exhaust port 10 accordingly, and the end of the exhaust channel 3 with a larger inner diameter is provided with an inlet 31. In the figure, the inlet 31 is located at the side position of the exhaust channel 3. The inner diameter of the inlet 31 is much smaller than the inner diameter of the thicker end of the exhaust channel 3, so that the exhaust gas entering the exhaust channel 3 is now buffered in the area with a larger inner diameter, and a side wall of the inlet 31 extends along the outer side of the exhaust end as a partition 32.

[0043] The pressure regulating member 4 is rotatably arranged at the inlet 31 of the exhaust passage 3. One end of the pressure regulating member 4 is rotatably connected to one side of the inlet 31 as a rotating end. The other end of the pressure regulating member 4 is matched with one side wall of the exhaust passage 3 as a movable end 43. The length of the connection between the movable end 43 of the pressure regulating member 4 and the connecting end 41 is greater than the inner diameter of the inlet 31. In the figure, the movable end 43 of the pressure regulating member 4 extends to the middle of the exhaust passage 3. When the pressure regulating member 4 is used to cover the inlet 31, the movable end 43 of the pressure regulating member 4 abuts against the inner wall of the exhaust passage 3. At this time, the pressure regulating member 4 connected to the movable end The line connecting the pressure regulating member 43 and the connecting end 41 forms an angle with the end face of the exhaust end, and the angle ranges from 50 to 80°. In the present embodiment, the distance between the movable end 43 of the pressure regulating member 4 and the connecting end 41 is greater than the inner diameter of the inlet 31, so that the movable end 43 can extend to the middle of the exhaust passage 3, and the internal space of the exhaust passage 3 provides a space for the movable end 43 to move. In the figure, the connecting end 41 of the pressure regulating member 4 is rotatably connected to the end area of ​​the partition 32, or is rotatably connected to the end area close to the partition 32, and the movable end 43 can abut against the side wall of the exhaust passage 3.

[0044] Furthermore, the pressure regulating member 4 is also provided with a limiting member 44, which is used to limit the rotation range of the movable end 43 by cooperating with the side wall of the exhaust passage 3, wherein the limiting member 44 may have an elastic spring sheet or a section of spring. Preferably, the limiting member 44 is located between the pressure regulating member 4 and the partition portion 32, and the limiting member 44 cooperates with the partition portion 32 to limit the rotation range of the movable end 43. Furthermore, at least one end of the limiting member 44 is located on the side of the main body facing away from the abutting portion, so that the limiting member 44 limits the swing range of the pressure regulating member 4 from the direction facing away from the abutting portion.

[0045] Combination Figure 1-3 A specific structure of the pressure regulating member 4 applied to this embodiment is provided.

[0046] The pressure regulating member 4 comprises a body, Figure 3 In the figure, the main body is in the shape of a straight plate as a whole, and a round shaft portion is provided at one end of the main body as a connecting end 41, and the connecting end 41 can be rotatably matched with the shaft hole opened on one side of the inlet 31, and the other end of the main body serves as a movable end 43, and a contact portion is protruded on the surface of the movable end 43, and a limiting member 44 is connected to the side of the main body opposite to the contact portion. Preferably, the limiting member 44 is formed integrally with the main body, and one end of the limiting member 44 is connected to the main body near the connecting end 41, and the other end of the limiting member 44 extends obliquely along a direction deviating from the main body, and the angle between the limiting member 44 and the main body ranges from 25 to 40°. Of course, the limiting member 44 can also adopt other structures.

[0047] When the pressure regulating member 4 covers the inlet 31 to block the connection between the exhaust channel 3 and the exhaust end, the abutting portion abuts against the inner wall of the exhaust channel 3. When the exhaust end discharges the exhaust gas to drive the pressure regulating member 4 to rotate, the abutting portion is separated from the side wall of the exhaust channel 3 until the limit member 44 abuts against the side wall of the exhaust channel 3 (the side of the partition 32 facing away from the exhaust end), thereby limiting the rotation angle of the pressure regulating member 4. When the exhaust gas in the exhaust channel 3 is discharged from the exhaust port 10 and a large amount of gas is discharged, the air pressure in the exhaust channel 3 decreases, thereby driving the pressure regulating member 4 to rotate until the abutting portion abuts against the inner wall of the exhaust channel 3 again, thereby covering the inlet 31 of the exhaust channel 3.

[0048] Combination Figure 1 , 2 , 4 and 5 provide another specific structure of the pressure regulating member 4 applied to this embodiment.

[0049] like Figure 4 , 5As shown, the pressure regulating member 4 includes a main body, which is in the shape of a straight plate as a whole. A round shaft portion is provided at one end of the main body as a connecting end 41, and the connecting end 41 can be rotatably matched with an axial hole opened on one side of the inlet 31. The other end of the main body serves as a movable end 43. The edges on both sides of the movable end 43 are bent and extended to the same side to form a protruding abutting portion. A hollow area 45 is provided in the middle of the main body, and one end of the limiting member 44 is connected to the edge of the hollow area 45, and the other end of the limiting member 44 passes through the hollow area 45 and is located on the side of the main body opposite to the abutting portion.

[0050] In this embodiment, the limit member 44 is a strip plate-like structure, and the middle part of the limit member 44 is bent to form a U-shaped portion. The U-shaped portion makes the whole form an elastic structure, which can generate an elastic reset force to drive the driving pressure regulating member 4 to reset. The two ends of the U-shaped portion have different lengths. The U-shaped portion passes through the hollow area 45 and is located on the same side of the main body as the abutment, and the hollow area 45 reserves space for the deformation of the U-shaped portion. One end (the shorter end) of the U-shaped portion is connected to the edge of the hollow area 45 away from the abutment. Preferably, the limit member 44 and the main body are an integral structure, and the other end (the longer end) of the U-shaped portion extends in a direction away from the main body on the side of the main body opposite to the abutment, and the other end of the U-shaped portion is bent to facilitate abutment with the partition 32.

[0051] When the pressure regulating member 4 covers the inlet 31 to block the communication between the exhaust channel 3 and the exhaust end, the other end of the U-shaped portion is kept in contact with the partition 32. Figure 5 The dotted line portion; when the exhaust gas discharged from the exhaust end drives the pressure regulating member 4 to rotate, the abutment portion is separated from the side wall of the exhaust passage 3. During this process, the U-shaped portion of the stopper 4 undergoes corresponding deformation in the hollow area 45. The deformation of the stopper 44 can provide a reset force for the rotation of the pressure regulating member 4; the overall structure of the pressure regulating member 4 is shown in FIG. Figure 5 When the exhaust gas in the exhaust channel 3 is discharged from the exhaust port 10, after a large amount of gas is discharged, the air pressure in the exhaust channel 3 decreases, thereby driving the pressure regulating member 4 to rotate until the abutting portion abuts against the inner wall of the exhaust channel 3 again, thereby covering the inlet 31 of the exhaust channel 3, and the pressure regulating member 4 returns to Figure 5 Middle dashed line state.

[0052] like Figure 1 , 2As shown, a plurality of arc-extinguishing components 5 arranged at intervals are clamped inside one end of the exhaust channel 3 away from the arc-extinguishing chamber 2, and a plurality of connecting holes are opened on each arc-extinguishing component 5. The plurality of connecting holes are preferably arranged in an array, and the connecting holes of two adjacent arc-extinguishing components 5 are staggered. In the present embodiment, the arc-extinguishing component 5 closer to the exhaust port 10 has a smaller size to match the change in the inner diameter of the exhaust channel 3. In the figure, five arc-extinguishing components 5 are arranged at intervals in the area of ​​the exhaust channel 3 close to the exhaust port 10, and a clamping groove is opened on the side wall of the exhaust channel 3, and the edge of each arc-extinguishing component 5 is clamped in the clamping groove. The arc-extinguishing component 5 closest to the exhaust port 10 has the smallest size, the two arc-extinguishing components 5 in the middle have the same size, and the other two arc-extinguishing components 5 far from the exhaust port 10 have the largest size.

[0053] Combination Figure 1 , 2 A circuit breaker is provided, comprising a shell, an operating mechanism and at least one circuit breaker pole are arranged in the shell, at least one exhaust port 10 is opened at one end of the shell, an operating hole is opened at the other end of the shell, the operating mechanism is arranged in the shell, a handle connected to the operating mechanism extends out of the shell from the operating hole, each circuit breaker pole comprises a pair of wiring components and a contact mechanism connected between the pair of wiring components, and the arc extinguishing system of the above embodiment is arranged on one side of the contact mechanism of each circuit breaker pole.

[0054] Specifically, an installation area corresponding to the arc extinguishing system is provided in the shell, and the installation area is located on the side of the contact mechanism away from the operating mechanism. One end of the installation area is connected to an exhaust port 10 of the shell, and a partition 32 is provided in the middle of the installation area. The partition 32 divides the installation area into an arc extinguishing chamber 20 and an exhaust channel 3, wherein the arc extinguishing chamber 20 is used to assemble the arc extinguishing chamber 2, and the exhaust channel 3 is connected between the exhaust port 10 and the arc extinguishing chamber 20.

[0055] Furthermore, the housing includes a middle cover 12, a base 11 and a pedestal 13, wherein the middle cover 12 is spaced apart from the pedestal 11, the installation area is located between the middle cover 12 and the pedestal 11, a partition 32 for dividing the installation area into an arc extinguishing chamber 20 and an exhaust channel 3 is formed by a protrusion of the inner side wall of the pedestal 11 and / or the middle cover 12, the pedestal 13 is assembled at the same end of the assembled middle cover 12 and the pedestal 11, and an exhaust hole connected to the installation area is opened on the pedestal 13.

[0056] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate directions or positional relationships based on directions or positional relationships shown in the drawings, or directions or positional relationships that are usually placed when in use, and are only for the convenience of description, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish descriptions, and cannot be understood as indicating relative importance.

[0057] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be 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. An arc extinguishing system, comprising an arc extinguishing chamber (2), the arc extinguishing chamber (2) being arranged inside a housing of a circuit breaker, the housing being provided with an exhaust port (10), an exhaust channel (3) being connected between the exhaust port (10) and an exhaust end of the arc extinguishing chamber (2), the two ends of the exhaust channel (3) being respectively connected with the exhaust end and the exhaust port (10), characterized in that: The device also comprises a pressure regulating member (4), which is rotatably disposed in the exhaust passage (3) and is driven by the air pressure difference between the exhaust passage (3) and the exhaust end, so that the exhaust passage (3) and the exhaust end remain connected or are blocked from being connected.

2. The arc extinguishing system according to claim 1, characterized in that: An inlet (31) is provided at one end of the exhaust passage (3), the inlet (31) being communicated with a side position of the exhaust end, the connecting end (41) of the pressure regulating member (4) being rotatably connected to one side of the inlet (31), and the movable end (43) of the pressure regulating member (4) cooperating with a side wall of the exhaust passage (3) to open or close the inlet (31).

3. The arc extinguishing system according to claim 2, characterized in that: The distance between the movable end (43) and the connecting end (41) of the pressure regulating member (4) is greater than the inner diameter of the inlet (31), so that the movable end (43) extends to the middle of the exhaust passage (3) and moves in the exhaust passage (3).

4. The arc extinguishing system according to claim 3, characterized in that: When the pressure regulating member (4) covers the inlet (31), the angle between the line connecting the movable end (43) and the connecting end (41) and the end surface of the exhaust end is in the range of 50 to 80 degrees.

5. The arc extinguishing system according to claim 2, characterized in that: The pressure regulating member (4) is provided with a limiting member (44), and the limiting member (44) cooperates with the side wall of the exhaust passage (3) to limit the rotation range of the movable end (43).

6. The arc extinguishing system according to any one of claims 1 to 5, characterized in that: The exhaust channel (3) is in the shape of a trumpet with one end being thicker and the other end being thinner. The end of the exhaust channel (3) with a smaller inner diameter is correspondingly connected to the exhaust port (10), and the end of the exhaust channel (3) with a larger inner diameter is provided with an inlet (31) connected to the exhaust end.

7. The arc extinguishing system according to claim 6, characterized in that: The inlet (31) corresponds to the side position of the exhaust channel (3) and the exhaust end, a side wall of the inlet (31) serves as a partition (32) extending along the outside of the exhaust end, and the connecting end (41) of the pressure regulating member (4) is rotatably connected to the partition (32).

8. The arc extinguishing system according to claim 1, characterized in that: A plurality of arc extinguishing components (5) arranged at intervals are mounted inside one end of the exhaust passage (3) away from the arc extinguishing chamber (2).

9. The arc extinguishing system according to claim 8, characterized in that: Each arc-extinguishing member (5) is provided with a plurality of communicating holes, and the communicating holes of two adjacent arc-extinguishing members (5) are arranged in a staggered manner.

10. The arc extinguishing system according to claim 1, characterized in that: The pressure regulating member (4) comprises a body, one end of which is provided with a round shaft portion as a connecting end (41), the other end of which is provided with a movable end (43), a surface of which is provided with a buttressing portion protruding therefrom, a limiting member (44) being connected to the body, and at least one end of which is located on a side of the body opposite to the buttressing portion.

11. The arc extinguishing system according to claim 10, characterized in that: The limiting member (44) is connected to a side of the main body opposite to the abutting portion. The limiting member (44) is a straight plate connected to the main body, and one end of the limiting member (44) is connected to the main body near the connecting end (41). The other end of the limiting member (44) extends obliquely in a direction deviating from the main body. The angle between the limiting member (44) and the main body is in the range of 25 to 40 degrees.

12. The arc extinguishing system according to claim 10, characterized in that: A hollow area (45) is provided in the middle of the body, one end of the limiting member (44) is connected to the edge of the hollow area (45), and the other end of the limiting member (44) passes through the hollow area (45) and is located on a side of the body opposite to the abutting portion.

13. The arc extinguishing system according to claim 12, characterized in that: The limiting member (44) is formed by bending a strip plate to form a U-shaped portion, the U-shaped portion passes through the hollow area (45) and is located on the same side of the main body as the abutting portion, and the hollow area (45) reserves a space for the U-shaped portion to deform, one end of the U-shaped portion is connected to the edge of the hollow area (45) away from the abutting portion, and the other end of the U-shaped portion extends in a direction away from the main body on a side of the main body opposite to the abutting portion, and the other end of the U-shaped portion is bent.

14. A circuit breaker comprising a housing, wherein a contact mechanism is arranged in the housing, characterized in that: An arc extinguishing system as described in any one of claims 1 to 13 is provided on one side of the contact mechanism.

15. The arc extinguishing system according to claim 14, characterized in that: An installation area is provided in the shell, one end of the installation area is connected to an exhaust port (10) provided at one end of the shell, a partition (32) is provided in the middle of the installation area, the partition (32) divides the installation area into an arc extinguishing chamber (20) and an exhaust channel (3), the arc extinguishing chamber (2) is provided in the arc extinguishing chamber (20), and the exhaust channel (3) is connected between the exhaust port (10) and the arc extinguishing chamber (20).

Images