Circuit breaker

Abstract

A circuit breaker comprises a shell, a moving contact, a static contact, an operating mechanism and an arc extinguish chamber, the moving contact, the static contact, the operating mechanism and the arc extinguish chamber are arranged in the shell, the operating mechanism is used for driving the moving contact and the static contact to be in contact and separated, an exhaust channel is arranged in the shell, and an arc inlet is formed in one end, close to the arc extinguish chamber, of the exhaust channel. One end, far away from the arc extinguish chamber, of the exhaust channel is provided with an arc discharge port communicated with the outside of the shell, the baffle can rotate to a first position under the action of gravity and block the arc inlet, and arc extinguish gas exhausted by the arc extinguish chamber can drive the baffle to rotate to a second position and open the arc inlet; the baffle plate blocks the arc inlet of the exhaust channel under the action of gravity in a normal state, so that dust, foreign matters, water vapor and the like are prevented from entering the shell from the exhaust channel, and gas can flow in a single direction without arranging a spring to drive the baffle plate.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical appliances, specifically to a circuit breaker. Background Technology

[0002] Circuit breakers, as crucial protective devices in power systems, possess overload long-delay and short-circuit instantaneous protection functions, and can be used in conjunction with leakage current devices, measurement modules, and electrical control units. However, in practical applications, the venting structure of circuit breakers often becomes a weak point in their performance. Existing circuit breaker venting structures typically include arc vents. However, this design has significant drawbacks.

[0003] Circuit breakers are typically installed inside distribution cabinets, where the environment is often complex, containing significant amounts of dust, dirt, insects, and potential foreign objects. These particles can easily enter the circuit breaker through the arc extinguishing port, interfering with its normal operation. Furthermore, the arc generated when a circuit breaker interrupts a large short-circuit current can produce ionized gases and tiny metal particles in its exhaust. These gases and particles can damage the switchgear cabinet structure during exhaust and may also re-enter the circuit breaker through the arc extinguishing port, creating a vicious cycle. Utility Model Content

[0004] The purpose of this utility model is to overcome at least one defect of the prior art and provide a circuit breaker.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A circuit breaker includes a housing and a moving contact, a stationary contact, an operating mechanism, and an arc-extinguishing chamber, all disposed within the housing. The operating mechanism is used to actuate the moving contact to contact and separate from the stationary contact. The housing has an exhaust channel; one end of the exhaust channel near the arc-extinguishing chamber has an arc inlet, and the other end of the exhaust channel away from the arc-extinguishing chamber has an arc outlet communicating with the outside of the housing.

[0007] It also includes a rotatable baffle that can rotate to a first position under the action of gravity and block the arc inlet. The arc-extinguishing gas discharged from the arc-extinguishing chamber can drive the baffle to rotate to a second position and open the arc inlet, so that the arc-extinguishing gas can be discharged from the arc-exhaust port through the exhaust channel.

[0008] Preferably, the outer shell is provided with a backflow prevention structure, which is used to prevent the baffle from opening the inlet when the external airflow pushes the baffle.

[0009] Preferably, the baffle includes a rotating part and a swinging part disposed on the radial side of the rotating part. The housing is provided with a mounting shaft for mounting the rotating part. The rotating part is disposed above the arc inlet along the height direction of the circuit breaker for vertically mounted circuit breakers. Alternatively, the rotating part is disposed above the arc inlet along the length direction of the circuit breaker for side-mounted circuit breakers.

[0010] Preferably, the housing is provided with a first rotating shaft and a second rotating shaft as mounting shafts. The first rotating shaft is located above the arc inlet in the height direction of the circuit breaker, and the second rotating shaft is located above the arc inlet in the length direction of the circuit breaker.

[0011] Preferably, the housing is provided with a partition, which forms a wiring mounting groove for accommodating the wiring terminals. The arc extinguishing chamber is disposed on one side of the wiring mounting groove along the length direction of the circuit breaker, and the exhaust channel is disposed on one side of the wiring mounting groove along the height direction of the circuit breaker. A part of the partition and a part of the housing respectively form the bottom wall and top wall of the exhaust channel opposite to each other.

[0012] Preferably, the rotating part is disposed above the arc inlet along the height direction of the circuit breaker, and the swinging part is inserted into the exhaust channel from the arc inlet. In the first position, the swinging part is disposed perpendicular to the airflow direction in the exhaust channel, and in the second position, the swinging part is disposed inclined to the airflow direction in the exhaust channel. The distance of the swinging part to the bottom wall in the second position is greater than the distance to the bottom wall in the first position.

[0013] Preferably, the outer casing has a limiting boss on the side of the swing part away from the exhaust channel as a backflow prevention structure. When the external airflow pushes the swing part, the limiting boss is used to prevent the swing part from opening the inlet.

[0014] Preferably, it also includes an arc-starting plate and a short-circuit trip unit disposed opposite each other on both sides of the arc-extinguishing chamber along the height direction of the circuit breaker, and the limiting boss is provided with a limiting groove for limiting the arc-starting plate.

[0015] Preferably, the rotating part is protruding on the side of the swinging part, the dimension of the swinging part along the width direction of the circuit breaker is larger than that of the rotating part, the width of the end of the swinging part away from the rotating part is smaller than the width of the end of the swinging part connected to the rotating part, the side of the swinging part near the arc-extinguishing chamber is provided with an inclined guide surface, and the guide surface is provided with a plurality of spaced guide grooves.

[0016] Preferably, the rotating part is disposed on the extension line of the top wall, the swinging part is located between the top wall and the rotating part in the first position and is arranged parallel to the airflow direction in the exhaust channel, the swinging part is arranged at an angle to the airflow direction in the exhaust channel in the second position, and the distance from the swinging part to the top wall in the second position is greater than the distance from the swinging part to the bottom wall in the first position.

[0017] Preferably, the partition includes a first isolation section and a second isolation section, and a third isolation section connected between the first isolation section and the second isolation section. The first isolation section forms the top wall of the exhaust channel. The connection between the third isolation section and the first isolation section is provided with a second blocking surface as a backflow prevention structure. When the external airflow pushes the swing section, the second blocking surface is used to prevent the swing section from opening the inlet.

[0018] Preferably, the housing is provided with an installation structure, which includes a first boss and a second boss protruding from the side of the first boss. The second boss is provided with an installation hole for inserting an installation shaft, and the rotating part is provided with a rotating hole for fitting onto the installation shaft. The rotating part is rotatably connected to the second boss through the installation shaft. The first boss of the rotating part is spaced apart, and the swinging part is spaced apart from the second boss.

[0019] Preferably, the outer casing includes a base and a cover that covers the base. The base and the cover are respectively provided with the mounting structure. The second protrusion of the base and the second protrusion of the cover are spaced apart, forming a space between the second protrusion of the base and the second protrusion of the cover to accommodate the rotating part. The two ends of the mounting shaft are respectively connected to the second protrusion of the base and the second protrusion of the cover. The rotating part protrudes from the side of the swinging part and is inserted between the second protrusion of the base and the second protrusion of the cover and sleeved on the mounting shaft.

[0020] Preferably, the bottom of the housing is provided with a raised first mounting structure and a second mounting structure, and a rail mounting groove is provided between the first mounting structure and the second mounting structure. The first mounting structure is provided with a sliding groove, and a limiting member that can move along the length direction of the circuit breaker is provided in the sliding groove. The rail mounting groove is used to fit onto the rail, and the limiting member is used to limit the rail. A base plate is provided between the rail mounting groove and the exhaust channel. The exhaust port is provided on the base plate and connects between the exhaust channel and the rail mounting groove.

[0021] Preferably, the outer casing is U-shaped, with a raised structure in the middle of the casing that protrudes along the height direction of the circuit breaker. The raised structure is used to accommodate the handle, at least part of the operating mechanism, and at least part of the short-circuit trip unit. The outer casing has a first wiring groove and a second wiring groove at both ends along the length direction of the circuit breaker. The first wiring groove and the second wiring groove are used to accommodate the first terminal and the second terminal, respectively. The stationary contact and the moving contact are disposed between the arc-extinguishing chamber and the second terminal. The overload trip unit is disposed between the second terminal and the moving contact. The short-circuit trip unit is located between the arc-extinguishing chamber and the handle and is connected between the first terminal and the stationary contact. The first wiring groove has a first mounting structure on one side along the height direction of the circuit breaker, and an exhaust channel is located between the first wiring groove and the first mounting structure. The second wiring groove has a second mounting structure on one side along the height direction of the circuit breaker, and the second mounting structure has an adjusting screw for pushing the overload trip unit.

[0022] In this circuit breaker, the baffle, under normal conditions, blocks the arc inlet of the exhaust channel under the action of gravity, preventing dust, foreign objects, and moisture from entering the casing through the exhaust channel. The electric arc generated when the contacts separate is converted into arc-extinguishing gas after passing through the arc-extinguishing chamber. The arc-extinguishing gas blows open the baffle and opens the exhaust channel, allowing the electric arc to be discharged from the arc-extinguishing port of the exhaust channel, ensuring normal disconnection. After the arc is extinguished, the baffle resets under the action of gravity and blocks the arc inlet again. The baffle does not require a spring to drive it, thus achieving unidirectional gas flow and ensuring normal contact between the moving and stationary contacts.

[0023] Furthermore, by selecting the installation position of the rotating part according to the installation method of the circuit breaker, it can be adapted not only to vertically installed circuit breakers but also to side-mounted circuit breakers, making it very versatile.

[0024] In addition, a first rotating shaft and a second rotating shaft are provided at the same time. Depending on the installation method of the circuit breaker, the rotating part of the baffle can be installed on the first rotating shaft or the second rotating shaft during assembly.

[0025] Furthermore, the first protrusion of the rotating part is spaced apart, and the second protrusion of the swing part is spaced apart. Since they do not contact each other, the problem of the baffle getting stuck can be avoided. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the circuit breaker in the first embodiment;

[0027] Figure 2 In the first embodiment Figure 1 A magnified view of a portion of the image;

[0028] Figure 3 This is a schematic diagram of the baffle structure in the first embodiment;

[0029] Figure 4 This is a schematic diagram of the structure when the baffle blocks the arc inlet in the first embodiment;

[0030] Figure 5 This is a schematic diagram of the structure when the baffle opens the arc inlet in the first embodiment;

[0031] Figure 6 This is a schematic diagram of the bottom structure of the circuit breaker in the first embodiment;

[0032] Figure 7 This is a schematic diagram of the structure on the left side of the baffle in the second embodiment;

[0033] Figure 8 This is a schematic diagram of the structure on the right side of the baffle in the second embodiment;

[0034] Figure 9 In the second embodiment Figure 8 A magnified view of a portion of the image;

[0035] Figure 10 This is a schematic diagram of the baffle structure in the second embodiment;

[0036] In the picture:

[0037] 1. Outer shell 34 guide surfaces

[0038] 2 Exhaust Channels 35 Guide Grooves

[0039] 3 baffles, 36 contact surfaces

[0040] 6 partitions, 41 limiting bosses

[0041] 10 Arc-starting plate 42 First blocking surface

[0042] 11 Moving contact 43 Guide surface

[0043] 12 stationary contacts 44 transition surfaces

[0044] 13 Operating mechanism 45 Limit slot

[0045] 14 Overload Trip Unit 51 First Boss

[0046] 15 Short-circuit trip unit 52 Second boss

[0047] 16 Arc-extinguishing chamber 53 mounting shaft

[0048] 17 First terminal block 61 First isolation section

[0049] 18 Second terminal block 63 Third isolation section

[0050] 19 Handle 62 Second Isolation Section

[0051] 21 Inlet Arc 64 Second Blocking Surface

[0052] 22-row arc-shaped opening 91 first installation structure

[0053] 23 Bottom Wall 92 Second Installation Structure

[0054] 24 top wall 93 rail mounting slot

[0055] 31 Rotating part 94 Slide groove

[0056] 32 Swinging Part 101 Base Plate

[0057] 33 Rotating hole 171 First wiring slot Detailed Implementation

[0058] The specific embodiments of the circuit breaker of this utility model are further described below with reference to the accompanying drawings. The circuit breaker of this utility model is not limited to the descriptions in the following embodiments.

[0059] like Figure 1-2 As shown, the circuit breaker in this embodiment includes a housing 1 and a moving contact 11, a stationary contact 12, an operating mechanism 13, an overload trip unit 14, a short-circuit trip unit 15, an arc-extinguishing chamber 16, and two terminals respectively disposed in the housing 1. The two terminals are a first terminal 17 and a second terminal 18, which are respectively connected to the circuit. The first terminal 17 and the second terminal 18 are respectively connected to the stationary contact 12 and the moving contact 11. In this embodiment, the first terminal 17 is connected to the stationary contact 12 via the short-circuit trip unit 15. The two terminals 18 are connected to the moving contact 11 via the overload trip unit 14. The operating mechanism 13 is connected to the handle 19. The operating mechanism 13 is used to drive the moving contact 11 to contact and separate from the stationary contact 12, thereby connecting and disconnecting the circuit. When the short-circuit trip unit 15 passes through the short-circuit current, it triggers the operating mechanism 13 to trip, causing the operating mechanism 13 to drive the moving contact 11 to separate from the stationary contact 12, thereby realizing the short-circuit protection function. When the overload trip unit 14 occurs, it triggers the operating mechanism 13 to trip, causing the operating mechanism 13 to drive the moving contact 11 to separate from the stationary contact 12, thereby realizing the overload protection function.

[0060] like Figure 1-2 As shown, an improvement in this embodiment is that the outer shell 1 is provided with an exhaust channel 2. The end of the exhaust channel 2 near the arc-extinguishing chamber 16 is provided with an arc inlet 21, and the end of the exhaust channel 2 away from the arc-extinguishing chamber 16 is provided with an arc discharge outlet 22 that communicates with the outside of the outer shell 1. It also includes a rotatable baffle 3. The baffle 3 can rotate to a first position under the action of gravity and block the arc inlet 21. The arc-extinguishing gas discharged from the arc-extinguishing chamber 16 can drive the baffle 3 to rotate to a second position and open the arc inlet 21, so that the arc-extinguishing gas is discharged from the arc discharge outlet 22 through the exhaust channel 2.

[0061] In this embodiment of the circuit breaker, the baffle 3 normally blocks the arc inlet 21 of the exhaust channel 2 under the action of gravity, preventing dust, foreign objects, and water vapor from entering the housing 1 from the exhaust channel 2. The electric arc generated when the contacts separate is converted into arc extinguishing gas after passing through the arc extinguishing chamber 16. The arc extinguishing gas blows open the baffle 3 and opens the exhaust channel 2, allowing the electric arc to be discharged from the arc outlet 22 of the exhaust channel 2 to the housing 1, ensuring normal disconnection. After the arc is discharged, the baffle 3 resets under the action of gravity and blocks the arc inlet 21 again. The baffle 3 does not need to be driven by a spring to achieve unidirectional gas flow, ensuring normal contact between the moving and stationary contacts 12.

[0062] Furthermore, the baffle 3 includes a rotating part 31 and a swinging part 32 disposed on one radial side of the rotating part 31. The housing 1 is provided with a mounting shaft for mounting the rotating part 31. (See reference...) Figure 4-5 In the first embodiment shown, the rotating part 31 is disposed above the arc inlet 21 along the height direction of the circuit breaker, for vertically installed circuit breakers, or, participating in... Figure 7-8 In the second embodiment shown, the rotating part 31 is arranged above the arc inlet 21 along the length direction of the circuit breaker. It is used for side-mounted circuit breakers. The installation position of the rotating part 31 is selected according to the installation method of the circuit breaker. It can be adapted not only to vertically installed circuit breakers, but also to side-mounted circuit breakers, and has a very wide range of applications.

[0063] like Figure 1-6 In the first embodiment shown, the circuit breaker is vertically mounted on a rail (not shown in the diagram), with the height direction of the circuit breaker parallel to the horizontal direction. The housing 1 is provided with a partition 6, which forms a wiring mounting groove for accommodating the wiring terminals. The arc-extinguishing chamber 16 is disposed on one side of the wiring mounting groove along the length direction of the circuit breaker. The exhaust channel 2 is disposed on one side of the wiring mounting groove along the height direction of the circuit breaker. A portion of the partition 6 and a portion of the housing 1 respectively form the bottom wall 23 and the top wall 24 opposite to the exhaust channel 2.

[0064] The rotating part 31 is disposed on the extension line of the top wall 24. The swinging part 32 is located between the top wall 24 and the rotating part 31 in the first position and is arranged parallel to the airflow direction in the exhaust channel 2. In the second position, the swinging part 32 is inclined to the airflow direction in the exhaust channel 2. The arc-extinguishing airflow can blow the swinging part 32 to rotate away from the top wall 24 from the first position, so that the distance from the swinging part 32 to the top wall 24 in the second position is greater than the distance to the bottom wall 23 in the first position. A space for arc-extinguishing gas is formed between the swinging part 32 and the top wall 24, thereby opening the arc inlet 21.

[0065] Furthermore, the outer casing 1 is equipped with a backflow preventer structure. When external airflow pushes the baffle 3, the backflow preventer structure prevents the baffle 3 from opening the inlet port 21, ensuring that the exhaust channel 2 can only exhaust air from the inside out, preventing external airflow from entering the outer casing 1. It is understood that the backflow preventer structure can also be omitted; when the baffle 3 hangs down under gravity, it provides some resistance to external airflow and also has a certain waterproof and dustproof effect. However, by setting a backflow preventer structure, the airtightness and waterproof and dustproof effects can be further improved.

[0066] like Figure 4As shown, the partition 6 includes a first isolation section 61 and a second isolation section 62, and a third isolation section 63 connected between the first isolation section 61 and the second isolation section 62. The first isolation section 61 forms the top wall 24 of the exhaust channel 2. The connection between the third isolation section 63 and the first isolation section 61 is provided with a second blocking surface 64 as a backflow prevention structure. When the external airflow pushes the swing section 32, the second blocking surface 64 is used to prevent the swing section 32 from opening the inlet port 21. The partition 6 not only serves to isolate the wiring terminals, but also functions as a backflow prevention structure and a limiting baffle 3.

[0067] Preferred, such as Figure 3 As shown, the swing part 32 has an inclined contact surface 36 at one end away from the rotating part 31. When the baffle 3 is in the first position, the contact surface 36 is in contact with the top wall 24.

[0068] like Figure 1-2 As shown, the outer casing 1 is provided with an installation structure, which includes a first boss 51 and a second boss 52 protruding from the side of the first boss 51. The second boss 52 is provided with an installation hole for inserting the installation shaft 53. The rotating part 31 is provided with a rotating hole 33 for fitting onto the installation shaft 53. The rotating part 31 is rotatably connected to the second boss 52 through the installation shaft 53. The first boss 51 of the rotating part 31 is spaced apart, and the swing part 32 is spaced apart from the second boss 52. Since they do not contact each other, the problem of the baffle 4 getting stuck can be avoided.

[0069] like Figure 1-3 As shown, the outer casing 1 includes a base and a cover (not shown) fitted onto the base. The base and cover are respectively provided with the mounting structure. The second protrusion 52 of the base and the second protrusion 52 of the cover are spaced apart, forming a space between them to accommodate the rotating part 31. The two ends of the mounting shaft 53 are respectively connected to the second protrusion 52 of the base and the second protrusion 52 of the cover. The rotating part 31 protrudes from the side of the swing part 32, inserts between the second protrusion 52 of the base and the second protrusion 52 of the cover, and is fitted onto the mounting shaft 53. During assembly, the mounting shaft 53 and the baffle 3 are first installed on the base, then the mounting hole on the cover is aligned with the mounting shaft 53, and the cover is assembled onto the base. Alternatively, the second protrusion 52 can be provided only on one of the base and the cover, while the other is not provided; both are within the scope of protection of this utility model.

[0070] like Figure 7-10In the second embodiment shown, the circuit breaker is placed horizontally so that its length direction is parallel to the horizontal direction. The position of the exhaust channel 2 in this embodiment is the same as that in the first embodiment. The rotating part 31 is arranged above the arc inlet 21 along the height direction of the circuit breaker. The swinging part 32 is inserted into the exhaust channel 2 from the arc inlet 21. The swinging part 32 is arranged perpendicular to the airflow direction in the exhaust channel 2 in the first position. The swinging part 32 is arranged obliquely to the airflow direction in the exhaust channel 2 in the second position. The arc-extinguishing airflow can blow the swinging part 32 to rotate away from the bottom wall 23 from the first position, so that the distance of the swinging part 32 to the bottom wall 23 in the second position is greater than the distance to the bottom wall 23 in the first position. A space for the arc-extinguishing gas is formed between the swinging part 32 and the top wall 24, thereby opening the arc inlet 21.

[0071] like Figure 8-9 As shown, the outer casing 1 has a limiting boss 41 on the side of the swing part 32 away from the exhaust channel 2 as a backflow prevention structure. When the external airflow pushes the swing part 32, the limiting boss 41 is used to prevent the swing part 32 from opening the inlet port 21.

[0072] Specifically, the swing part 32 has a limiting boss 41 on the side away from the exhaust channel 2. The limiting boss 41 has a first blocking surface 42 as a backflow prevention structure on the side near the exhaust channel 2. The limiting boss 41 has a guiding surface 43 on the side near the arc extinguishing chamber 16. The first blocking surface 42 and the guiding surface 43 are connected by an arc-shaped transition surface 44.

[0073] Furthermore, it also includes an arc-starting plate 10 and a short-circuit trip unit 15 arranged opposite each other on both sides of the arc-extinguishing chamber 16 along the height direction of the circuit breaker. The limiting boss 41 has a limiting groove 45 on the side away from the exhaust channel 2 for limiting the arc-starting plate 10. The arc-starting plate 10 and the short-circuit trip unit 15 are arranged opposite each other on both sides of the arc-extinguishing chamber 16 along the height direction of the circuit breaker. The anti-reverse structure not only serves as a limiting baffle 3 and guides the airflow, but also serves to install the arc-starting plate 10.

[0074] like Figure 7-9 As shown, the outer casing 1 of this embodiment is provided with a mounting structure, which is basically the same as that in the first embodiment described above, except that the position and shape are different.

[0075] In the first embodiment described above, the mounting structure is located above the arc inlet 21 in the height direction of the circuit breaker, thereby placing the mounting shaft 53 above the arc inlet 21 in the height direction of the circuit breaker. In this embodiment, the mounting structure is located above the arc inlet 21 in the length direction of the circuit breaker, thereby placing the mounting shaft 53 above the arc inlet 21 in the length direction of the circuit breaker.

[0076] In another embodiment, the housing 1 is provided with a first rotating shaft and a second rotating shaft as mounting shafts 53. The first rotating shaft is located above the arc inlet 21 in the height direction of the circuit breaker, and the second rotating shaft is located above the arc inlet 21 in the length direction of the circuit breaker. By providing both the first and second rotating shafts, depending on the installation method of the circuit breaker, the rotating part 31 of the baffle 3 can be selected to be installed on the first rotating shaft or the second rotating shaft during assembly, which is very flexible in use.

[0077] like Figure 10 As shown, the rotating part 31 protrudes from the side of the swing part 32. The dimension of the swing part 32 along the width direction of the circuit breaker is larger than that of the rotating part 31. The width of the end of the swing part 32 away from the rotating part 31 is smaller than the width of the end of the swing part 32 connected to the rotating part 31. The side of the swing part 32 near the arc-extinguishing chamber 16 is provided with an inclined guide surface 34. The guide surface 34 is provided with multiple spaced guide grooves 35. The guide grooves 35 can concentrate the airflow, facilitating the discharge of the arc-extinguishing gas. Of course, the swing part 32 may not have an inclined guide surface 34, and the guide grooves 35 may be provided directly on the side of the swing part 32 near the arc-extinguishing chamber 16, or the guide grooves 35 may not be provided at all; both are within the protection scope of this utility model.

[0078] like Figure 1 , 6 As shown, the arc-discharge port 22 is located at the bottom of the outer casing 1, and the bottom of the outer casing 1 is provided with a protruding first mounting structure 91 and a second mounting structure 92. See also Figure 1 A rail mounting groove 93 is provided between the first mounting structure 91 and the second mounting structure 92. The first mounting structure 91 has a sliding groove 94, and the sliding groove 94 has a limiting member (not shown) that can move along the length of the circuit breaker. The rail mounting groove 93 is used to fit onto a rail (not shown), and the limiting member is used to limit the rail movement, allowing the circuit breaker to be mounted on the rail. A base plate 101 is provided between the rail mounting groove 93 and the exhaust channel 2. The exhaust port 22 is located on the base plate 101 and connects the exhaust channel 2 and the rail mounting groove 93, so that the opening of the exhaust port 22 faces the bottom of the circuit breaker, preventing gas from being discharged along the length of the circuit breaker and reducing the impact on adjacent circuit breakers. Of course, the exhaust direction of the exhaust port 22 can also be parallel to the length of the circuit breaker, both of which fall within the protection scope of this utility model.

[0079] Specifically, the circuit breaker in this embodiment is a miniature circuit breaker. The outer casing 1 is U-shaped, and a protruding structure protruding along the height direction of the circuit breaker is provided in the middle of the outer casing 1. The protruding structure is used to accommodate the handle 19, at least part of the operating mechanism 13, and at least part of the short-circuit trip unit 15. The outer casing 1 has a first wiring groove 171 and a second wiring groove at both ends along the length direction of the circuit breaker. The first wiring groove 171 and the second wiring groove are respectively used to accommodate the first terminal 17 and the second terminal 18. The stationary contact 12 and the moving contact 11 are disposed between the arc-extinguishing chamber 16 and the second terminal 18. Overload tripping... The trip unit 14 is disposed between the second terminal 18 and the moving contact 11. The short-circuit trip unit 15 is located between the arc-extinguishing chamber 16 and the handle 19, and is connected between the first terminal 17 and the stationary contact 12. The first wiring groove 171 has a first mounting structure 91 on one side along the height direction of the circuit breaker. The exhaust channel 2 is located between the first wiring groove 171 and the first mounting structure 91. The second wiring groove has a second mounting structure 92 on one side along the height direction of the circuit breaker. The second mounting structure 92 has an adjusting screw for pushing the overload trip unit 14. Preferably, the arc-extinguishing port 22 is elongated, and the length direction of the arc-extinguishing port 22 is parallel to the width direction of the circuit breaker.

[0080] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used during use. They are only for ease of description and do not indicate that the device or component referred to must have a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating relative importance.

[0081] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A circuit breaker, comprising a housing (1) and a moving contact (11), a stationary contact (12), an operating mechanism (13), and an arc-extinguishing chamber (16) respectively disposed in the housing (1), wherein the operating mechanism (13) is used to drive the moving contact (11) to contact and separate from the stationary contact (12), the housing (1) is provided with an exhaust channel (2), one end of the exhaust channel (2) near the arc-extinguishing chamber (16) is provided with an arc inlet (21), and the other end of the exhaust channel (2) away from the arc-extinguishing chamber (16) is provided with an arc discharge outlet (22) communicating with the outside of the housing (1), characterized in that: It also includes a rotating baffle (3), which can rotate to the first position under the action of gravity and block the arc inlet (21). The arc extinguishing gas discharged from the arc extinguishing chamber (16) can drive the baffle (3) to rotate to the second position and open the arc inlet (21), so that the arc extinguishing gas is discharged from the arc outlet (22) through the exhaust channel (2).

2. The circuit breaker according to claim 1, characterized in that: The outer shell (1) is provided with a backflow prevention structure, which is used to prevent the baffle (3) from opening the inlet (21) when the external airflow pushes the baffle (3).

3. The circuit breaker according to claim 1 or 2, characterized in that: The baffle (3) includes a rotating part (31) and a swing part (32) disposed on the radial side of the rotating part (31). The housing (1) is provided with a mounting shaft for mounting the rotating part (31). The rotating part (31) is disposed above the arc inlet (21) along the height direction of the circuit breaker and is used for vertically mounted circuit breakers. Alternatively, the rotating part (31) is disposed above the arc inlet (21) along the length direction of the circuit breaker and is used for side-mounted circuit breakers.

4. The circuit breaker according to claim 3, characterized in that: The housing (1) is provided with a first rotating shaft and a second rotating shaft as mounting shafts (53). The first rotating shaft is located above the arc inlet (21) in the height direction of the circuit breaker, and the second rotating shaft is located above the arc inlet (21) in the length direction of the circuit breaker.

5. The circuit breaker according to claim 3, characterized in that: The outer casing (1) is provided with a partition (6), which forms a wiring mounting groove for accommodating wiring terminals. The arc extinguishing chamber (16) is located on one side of the wiring mounting groove along the length of the circuit breaker. The exhaust channel (2) is located on one side of the wiring mounting groove along the height of the circuit breaker. A part of the partition (6) and a part of the outer casing (1) respectively form the bottom wall (23) and top wall (24) of the exhaust channel (2).

6. The circuit breaker according to claim 5, characterized in that: The rotating part (31) is arranged above the arc inlet (21) along the height direction of the circuit breaker. The swinging part (32) is inserted into the exhaust channel (2) from the arc inlet (21). In the first position, the swinging part (32) is arranged perpendicular to the airflow direction in the exhaust channel (2). In the second position, the swinging part (32) is arranged obliquely to the airflow direction in the exhaust channel (2). In the second position, the distance of the swinging part (32) to the bottom wall (23) is greater than the distance to the bottom wall (23) in the first position.

7. The circuit breaker according to claim 6, characterized in that: The outer casing (1) has a limiting boss (41) on the side of the swing part (32) away from the exhaust channel (2) as a backflow prevention structure. When the external airflow pushes the swing part (32), the limiting boss (41) is used to prevent the swing part (32) from opening the inlet (21).

8. The circuit breaker according to claim 7, characterized in that: It also includes an arc-starting plate (10) and a short-circuit trip unit (15) arranged opposite each other on both sides of the arc-extinguishing chamber (16) along the height direction of the circuit breaker, and the limiting boss (41) is provided with a limiting groove (45) for limiting the arc-starting plate (10).

9. The circuit breaker according to claim 6, characterized in that: The rotating part (31) is protruding on the side of the swing part (32). The dimension of the swing part (32) along the width direction of the circuit breaker is larger than that of the rotating part (31). The width of the swing part (32) away from the rotating part (31) is smaller than the width of the end of the swing part (32) connected to the rotating part (31). The side of the swing part (32) near the arc-extinguishing chamber (16) is provided with an inclined guide surface (34). The guide surface (34) is provided with a plurality of spaced guide grooves (35).

10. The circuit breaker according to claim 5, characterized in that: The rotating part (31) is located on the extension line of the top wall (24). The swinging part (32) is located between the top wall (24) and the rotating part (31) in the first position and is arranged parallel to the airflow direction in the exhaust channel (2). In the second position, the swinging part (32) is inclined to the airflow direction in the exhaust channel (2). The distance from the swinging part (32) to the top wall (24) in the second position is greater than the distance from the swinging part (32) to the bottom wall (23) in the first position.

11. The circuit breaker according to claim 10, characterized in that: The partition (6) includes a first isolation section (61) and a second isolation section (62), and a third isolation section (63) connected between the first isolation section (61) and the second isolation section (62). The first isolation section (61) forms the top wall (24) of the exhaust channel (2). The connection between the third isolation section (63) and the first isolation section (61) is provided with a second blocking surface (64) as a backflow prevention structure. When the external airflow pushes the swing section (32), the second blocking surface (64) is used to prevent the swing section (32) from opening the inlet (21).

12. The circuit breaker according to claim 3, characterized in that: The outer casing (1) is provided with an installation structure, which includes a first boss (51) and a second boss (52) protruding from the side of the first boss (51). The second boss (52) is provided with an installation hole for inserting an installation shaft (53). The rotating part (31) is provided with a rotating hole (33) for fitting onto the installation shaft (53). The rotating part (31) is rotatably connected to the second boss (52) through the installation shaft (53). The rotating part (31) is spaced apart from the first boss (51), and the swinging part (32) is spaced apart from the second boss (52).

13. The circuit breaker according to claim 12, characterized in that: The outer casing (1) includes a base and a cover that covers the base. The base and the cover are respectively provided with the mounting structure. The second protrusion (52) of the base and the second protrusion (52) of the cover are spaced apart. A space for accommodating the rotating part (31) is formed between the second protrusion (52) of the base and the second protrusion (52) of the cover. The two ends of the mounting shaft (53) are respectively connected to the second protrusion (52) of the base and the second protrusion (52) of the cover. The rotating part (31) is protruding and disposed on the side of the swing part (32). The rotating part (31) is inserted between the second protrusion (52) of the base and the second protrusion (52) of the cover and is sleeved on the mounting shaft (53).

14. The circuit breaker according to claim 1, characterized in that: The bottom of the outer casing (1) is provided with a raised first mounting structure (91) and a second mounting structure (92). A rail mounting groove (93) is provided between the first mounting structure (91) and the second mounting structure (92). A sliding groove (94) is provided in the first mounting structure (91). A limiting member that can move along the length direction of the circuit breaker is provided in the sliding groove (94). The rail mounting groove (93) is used to fit on the rail. The limiting member is used to limit the rail. A base plate (101) is provided between the rail mounting groove (93) and the exhaust channel (2). The exhaust port (22) is set on the base plate (101) and is connected between the exhaust channel (2) and the rail mounting groove (93).

15. The circuit breaker according to claim 14, characterized in that: The outer casing (1) is U-shaped, and a protruding structure protruding along the height direction of the circuit breaker is provided in the middle of the outer casing (1). The protruding structure is used to accommodate the handle (19), at least part of the operating mechanism (13), and at least part of the short-circuit trip unit (15). The outer casing (1) has a first wiring groove (171) and a second wiring groove at both ends along the length direction of the circuit breaker. The first wiring groove (171) and the second wiring groove are used to accommodate the first terminal (17) and the second terminal (18), respectively. The stationary contact (12) and the moving contact (11) are arranged between the arc-extinguishing chamber (16) and the second terminal (18). The overload trip unit (14) is arranged in the second terminal. Between the line terminal (18) and the moving contact (11), the short-circuit trip unit (15) is located between the arc-extinguishing chamber (16) and the handle (19). The short-circuit trip unit (15) is connected between the first wiring terminal (17) and the stationary contact (12). The first wiring groove (171) is provided with a first mounting structure (91) on one side along the height direction of the circuit breaker. The exhaust channel (2) is located between the first wiring groove (171) and the first mounting structure (91). The second wiring groove is provided with a second mounting structure (92) on one side along the height direction of the circuit breaker. The second mounting structure (92) is provided with an adjusting screw for pushing the overload trip unit (14).

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