Pressure relief device of circuit breaker

Abstract

The utility model relates to the technical field of low-voltage electric appliances, in particular to a pressure relief device of a circuit breaker. The pressure relief device comprises a circuit breaker body, an arc extinguish chamber housing and a mask housing, the arc extinguish chamber housing covers one end of the circuit breaker body along a first direction, the mask housing covers one end of the circuit breaker body along a second direction, an outer wall plate, close to the mask housing, of the arc extinguish chamber housing is provided with a communication port, and the communication port is communicated with the communication port. A first pressure relief opening is formed in at least one outer wall plate, in the third direction, of the mask shell, and the communicating opening communicates with the first pressure relief opening. Part of gas in the arc extinguish chamber housing is guided into the face cover housing through the communication port, so that the problems that the arc extinguish chamber housing is turned over, a top cover of the arc extinguish chamber is broken through, the face cover housing is broken through and the like due to too high air pressure in the arc extinguish chamber housing are solved; and the gas entering the mask shell is discharged to the outside from the first pressure relief opening, so that the problem that the gas is gathered in the circuit breaker is avoided.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, and in particular to a pressure relief device for a circuit breaker. Background Technology

[0002] A circuit breaker is a switching device capable of closing, carrying, and interrupting current under normal circuit conditions and capable of closing, carrying, and interrupting current under abnormal circuit conditions within a specified time. In some common circuit breakers, the circuit breaker includes a circuit breaker body, an arc-extinguishing chamber housing located above the circuit breaker body, and a front cover housing located on the front side of the circuit breaker body. The arc-extinguishing chamber is installed on top of the circuit breaker body. The operating mechanism, secondary circuit components, circuit breaker accessories, and other electrical components are installed at the front end of the circuit breaker body (i.e., the end facing the operator). The arc-extinguishing chamber housing covers the outside of the arc-extinguishing chamber, and the front cover housing covers the outside of the aforementioned electrical components. Generally, vents are provided on the left and right side walls and the rear side wall of the arc-extinguishing chamber housing, through which the gas generated inside the arc-extinguishing chamber during current interruption is discharged.

[0003] To meet market demands, the rated voltage and breaking capacity of circuit breakers are constantly increasing, and correspondingly, the requirements for the pressure relief capacity of circuit breaker products are also becoming higher. In existing circuit breakers, because there is no vent on the front side of the arc-extinguishing chamber housing, a large amount of gas generated when the circuit breaker interrupts current cannot be discharged in time and accumulates inside the circuit breaker. This not only affects the performance of the circuit breaker, but in severe cases, it may also cause problems such as the arc-extinguishing chamber housing overturning, the top cover of the arc-extinguishing chamber being ruptured, and the face cover being ruptured. Utility Model Content

[0004] The purpose of this utility model is to provide a pressure relief device for a circuit breaker, in order to solve the technical problems existing in the prior art where a large amount of gas generated by the circuit breaker when interrupting current cannot be discharged in time and accumulates inside the circuit breaker. This not only affects the performance of the circuit breaker, but may also cause the arc-extinguishing chamber cover to overturn, the top cover of the arc-extinguishing chamber to break through, and the face cover to break through.

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

[0006] A pressure relief device for a circuit breaker includes a circuit breaker body, an arc-extinguishing chamber housing, and a face shield housing. The arc-extinguishing chamber housing covers one end of the circuit breaker body along a first direction, and the face shield housing covers one end of the circuit breaker body along a second direction. A communication port is provided on the outer wall panel of the arc-extinguishing chamber housing near the face shield housing, and a first pressure relief port is provided on at least one outer wall panel of the face shield housing along a third direction. The communication port and the first pressure relief port are connected.

[0007] Furthermore, at least one of the first pressure relief ports is respectively provided on the two outer wall plates along the third direction of the mask shell;

[0008] The number of the communication ports is multiple and they are divided into two groups of communication port components. The two groups of communication port components are respectively located at both ends of the arc-extinguishing chamber housing along the third direction. Each group of communication port components includes at least one communication port.

[0009] Furthermore, an air vent is provided inside the mask housing, and the air vent is connected between the connecting port and the first pressure relief port.

[0010] Furthermore, the mask shell has a set of air venting channel components at one end of the outer wall plate near the first pressure relief port, and the air venting channel components include one or more of the air venting channels.

[0011] When each group of the venting channel assembly includes one venting channel, the outlet range of the venting channel covers all the first pressure relief ports on the adjacent outer wall panel;

[0012] When each group of air venting channel components includes multiple air venting channels, the multiple air venting channels in each group of air venting channel components are arranged at intervals along the first direction, and one or more of the first pressure relief ports are correspondingly provided at the outlet of each air venting channel.

[0013] Furthermore, the number of the connecting port, the first pressure relief port, and the air venting channel are all multiple and are arranged in a one-to-one correspondence. The air venting channel is connected between the corresponding connecting port and the corresponding first pressure relief port.

[0014] And / or, a pressure relief chamber is provided inside the mask shell, and a notch is provided on the air venting channel, and the air venting channel is connected to the pressure relief chamber through the notch.

[0015] Furthermore, a second pressure relief port is provided on the outer wall of the pressure relief chamber along the third direction;

[0016] And / or, the air passage and / or the pressure relief chamber are provided with a deionization structure;

[0017] And / or, the air passage is a slit-shaped passage;

[0018] 0 and / or, the air passage extends in a meandering manner.

[0019] Furthermore, the mask shell includes a first shell component and a second shell component, the second shell component is disposed at at least one end of the first shell component along the third direction, and the first shell component, the second shell component, and the arc-extinguishing chamber shell are not in communication;

[0020] The first 5 pressure relief port is provided on the wall panel of the second housing component away from the first housing component.

[0021] Furthermore, the mask shell also includes a first longitudinal stiffener, and the second shell component includes a second component front wall and a second component side wall;

[0022] The first longitudinal stiffener and the sidewall of the second component are respectively connected to the front wall of the second component.

[0023] The first longitudinal stiffener is disposed between the first housing component and the second housing component at both ends along the third direction;

[0024] A plurality of transverse stiffeners are laid flat between the first longitudinal stiffener and the side wall of the second component, and a ventilation channel is formed between two adjacent or adjacent transverse stiffeners, the first longitudinal stiffener, the front wall of the second component, and the side wall of the second component.

[0025] 5. Further, a pressure relief chamber is provided within the second housing component, and the air passage is connected to the...

[0026] Pressure relief chamber connection configuration;

[0027] And / or, the second housing component is provided with a mounting cavity, which is not connected to the air passage.

[0028] Furthermore, the number of the second housing components is two, and they are respectively disposed at both ends of the first housing component along the third direction;

[0029] And / or, the mask shell is integrally formed or the first shell component and the second shell component are spliced ​​together.

[0030] The beneficial effects of this utility model are:

[0031] The pressure relief device for the circuit breaker provided by this utility model includes a circuit breaker body, an arc-extinguishing chamber cover, and a face shield. The arc-extinguishing chamber cover is installed at one end of the circuit breaker body along a first direction, and the face shield is installed at one end of the circuit breaker body along a second direction. A communication port is provided on the outer wall plate of the arc-extinguishing chamber cover near the face shield, and a first pressure relief port is provided on at least one outer wall plate of the face shield along a third direction. The communication port and the first pressure relief port are connected.

[0032] By providing a connecting port on the front side of the arc-extinguishing chamber housing, some of the gas inside the arc-extinguishing chamber housing is introduced into the face shield housing, relieving some of the pressure inside the arc-extinguishing chamber housing. This avoids problems such as the arc-extinguishing chamber housing overturning, the top cover of the arc-extinguishing chamber breaking, and the face shield housing breaking due to excessive gas pressure inside the arc-extinguishing chamber housing. The gas entering the face shield housing is discharged to the outside through the first pressure relief port, allowing the gas inside the circuit breaker to be discharged smoothly, avoiding the problem of gas accumulation inside the circuit breaker, thereby improving the breaking capacity, performance, and service life of the circuit breaker. Attached Figure Description

[0033] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0034] Figure 1 A three-dimensional structural schematic diagram of the pressure relief device of the circuit breaker provided in Embodiment 1 of this utility model, viewed from the front.

[0035] Figure 2 A three-dimensional cross-sectional view of the pressure relief device of the circuit breaker provided in Embodiment 1 of this utility model, viewed from the rear.

[0036] Figure 3 A three-dimensional structural diagram of the mask shell provided in Embodiment 1 of this utility model, viewed from the back.

[0037] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0038] Figure 5 A partial cross-section of the pressure relief device of the circuit breaker provided in Embodiment 1 of this utility model. Figure 1 ;

[0039] Figure 6 A partial cross-section of the pressure relief device of the circuit breaker provided in Embodiment 1 of this utility model. Figure 2 ;

[0040] Figure 7 A three-dimensional structural schematic diagram of the pressure relief device of the circuit breaker provided in Embodiment 2 of this utility model, viewed from the front.

[0041] Figure 8 A three-dimensional structural diagram of the second shell component provided in Embodiment 2 of this utility model, viewed from the rear.

[0042] Figure 9 This is a cross-sectional view of the air passage provided in Embodiment 3 of this utility model;

[0043] Figure 10 This is a partial structural diagram of the mask shell provided in Embodiment 4 of this utility model, viewed from the back.

[0044] icon:

[0045] 100 - Circuit breaker body;

[0046] 200 - Arc-extinguishing chamber casing; 210 - Connecting port; 220 - Air outlet;

[0047] 300 - Face mask shell; 310 - First shell component; 320 - Second shell component; 321 - First pressure relief port; 322 - Air passage; 323 - Enclosed space; 324 - Pressure relief chamber; 325 - Second pressure relief port; 326 - Mounting chamber; 330 - First longitudinal stiffener; 340 - Transverse stiffener; 350 - Second longitudinal stiffener; 360 - Sealing stiffener;

[0048] 400 - Installation location of the arc-extinguishing chamber;

[0049] 500-Secondary circuit terminal block. Detailed Implementation

[0050] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0051] It should be noted that in the description of this utility model, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0052] It should be noted that in the description of this utility model, the terms "connection" and "installation" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or a connection through an intermediate medium; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0053] In existing circuit breakers, the lack of an air outlet on the front side of the arc-extinguishing chamber casing leads to poor airflow inside the circuit breaker. This not only affects the performance of the circuit breaker but may also cause problems such as the arc-extinguishing chamber casing being overturned, the top cover of the arc-extinguishing chamber being ruptured, and the face cover being ruptured in severe cases.

[0054] Based on this, the present invention provides a pressure relief device for a circuit breaker, referring to... Figures 1 to 10 The pressure relief device includes a circuit breaker body 100, an arc-extinguishing chamber housing 200, and a face shield housing 300. The arc-extinguishing chamber housing 200 covers one end of the circuit breaker body 100 along a first direction, and the face shield housing 300 covers one end of the circuit breaker body 100 along a second direction. A communication port 210 is provided on the outer wall plate of the arc-extinguishing chamber housing 200 near the face shield housing 300. A first pressure relief port 321 is provided on at least one outer wall plate of the face shield housing 300 along a third direction. The communication port 210 and the first pressure relief port 321 are connected.

[0055] In some embodiments, the first direction, the second direction, and the third direction are perpendicular to each other. The first direction, the second direction, and the third direction may have different orientations depending on the installation method and model of the circuit breaker. In the embodiments provided in this application, the first direction is the height direction of the circuit breaker, the second direction is the width direction of the circuit breaker (i.e., the front-to-back direction when the operating mechanism of the circuit breaker faces a person), and the third direction is the length direction of the circuit breaker (i.e., the left-to-right direction when the operating mechanism of the circuit breaker faces a person).

[0056] In other embodiments, the first direction, the second direction, and the third direction may also intersect each other at acute (or obtuse) angles.

[0057] like Figure 1 and Figure 2 As shown, an arc-extinguishing chamber mounting position 400 is provided above the circuit breaker body 100. The circuit breaker includes an arc-extinguishing chamber (not shown in the figure) installed at the arc-extinguishing chamber mounting position 400. The number of arc-extinguishing chambers is set to one or more depending on the product specifications; when there are multiple arc-extinguishing chambers, the multiple arc-extinguishing chambers can be distributed side by side along a third direction. The arc-extinguishing chamber housing 200 covers the outside of the arc-extinguishing chamber to prevent the arc-extinguishing chamber from being exposed. The faceplate housing 300 covers the outside of the electrical components installed in front of the circuit breaker body 100 to prevent the electrical components from being exposed. The front end of the arc-extinguishing chamber housing 200 is provided with a connecting port 210, and at least one of the left and right ends of the mask housing 300 is provided with a first pressure relief port 321. The connecting port 210 and the first pressure relief port 321 are connected. In this way, when the current is disconnected, a large amount of gas generated is discharged into the arc-extinguishing chamber housing 200 from the exhaust port of the arc-extinguishing chamber, and some of the gas will enter the mask housing 300 from the connecting port 210, and finally be discharged to the outside from the first pressure relief port 321.

[0058] In the above structure, by providing a connecting port 210 at the front end of the arc-extinguishing chamber housing 200, some of the gas inside the arc-extinguishing chamber housing 200 is introduced into the face shield housing 300, relieving some of the pressure inside the arc-extinguishing chamber housing 200. This avoids problems such as the arc-extinguishing chamber housing overturning, the top cover of the arc-extinguishing chamber breaking, and the face shield breaking due to excessive gas pressure inside the arc-extinguishing chamber housing 200. The gas entering the face shield housing 300 is discharged to the outside through the first pressure relief port 321, allowing the gas inside the circuit breaker to be discharged smoothly, avoiding the problem of gas accumulation inside the circuit breaker. Compared with conventional circuit breakers, the pressure relief device provided in this application adds an exhaust and pressure relief path to the circuit breaker, allowing the large amount of gas generated when the circuit breaker breaks the current to be discharged in a timely manner, improving the breaking capacity, performance, and service life of the circuit breaker.

[0059] In some embodiments, one or more air outlets 220 are respectively provided on the two outer wall panels (i.e., the left and right outer wall panels) along the third direction of the arc-extinguishing chamber housing 200 and the outer wall panel away from the face shield housing 300 (i.e., the rear outer wall panel). That is, the arc-extinguishing chamber housing 200 is provided with openings for gas to be discharged from the arc-extinguishing chamber housing 200 at the front, rear, left, and right, so that the gas inside the arc-extinguishing chamber housing 200 can be discharged from four directions, making the exhaust smoother. The gas discharged from the connecting port 210 at the front end of the arc-extinguishing chamber housing 200 enters the face shield housing 300 and is guided to the first pressure relief ports 321 at the left and right ends of the face shield housing 300 for discharge. That is, the gas will not be discharged from the front of the circuit breaker, thereby avoiding the problem of airflow carrying charged particles rushing towards the operator and causing safety hazards, and also avoiding the problem of charged particles corroding the electrical components in front of the circuit breaker.

[0060] Optionally, at least one first pressure relief port 321 may be provided on only one of the outer wall panels of the mask housing 300 along the third direction, or at least one first pressure relief port 321 may be provided on each of the two outer wall panels of the mask housing 300 along the third direction. Preferably, multiple first pressure relief ports 321 may be provided on each of the two outer wall panels of the mask housing 300 along the third direction, which can improve the exhaust and pressure relief capacity of the mask housing 300.

[0061] like Figure 2 As shown, in the embodiment where the mask housing 300 has first pressure relief ports 321 respectively on its two outer wall panels along the third direction, the number of communication ports 210 is multiple and divided into two groups of communication port assemblies. The two groups of communication port assemblies are respectively located at both ends of the arc-extinguishing chamber housing 200 along the third direction, and each group of communication port assemblies includes at least one communication port 210. The two groups of communication port assemblies are respectively close to the two outer wall panels of the mask housing 300 along the third direction, so that the gas discharged from each group of communication port assemblies can be discharged to the outside through the first pressure relief port 321 on the adjacent outer wall panel of the mask housing 300.

[0062] Reference Figure 3 and 4 In some embodiments, a ventilation channel 322 is provided inside the mask housing 300, which is connected between the connecting port 210 and the first pressure relief port 321. The ventilation channel 322 can restrict the flow trajectory of gas flowing into the mask housing 300, preventing gas carrying charged particles from flowing into the electrical components inside the circuit breaker, thereby improving the safety performance of the circuit breaker.

[0063] Optionally, the mask housing 300 has a set of air passage assembly at one end of the outer wall plate near the first pressure relief port 321. The air passage assembly includes one or more air passages 322.

[0064] When each group of venting channel assemblies includes a venting channel 322, the outlet range of the venting channel 322 covers all the first pressure relief ports 321 on the adjacent outer wall panel;

[0065] When each group of air venting channel components includes multiple air venting channels 322, the multiple air venting channels 322 in each group of air venting channel components are arranged at intervals along the first direction, and one or more first pressure relief ports 321 are provided at the outlet of each air venting channel 322.

[0066] In an embodiment where the first pressure relief port 321 is provided on only one of the outer wall panels of the mask housing 300 along a third direction, only one set of air venting channel assemblies is provided inside the mask housing 300. In an embodiment where the first pressure relief port 321 is provided on both outer wall panels of the mask housing 300 along a third direction, two sets of air venting channel assemblies are provided inside the mask housing 300, and the two sets of air venting channel assemblies are respectively located at both ends of the mask housing 300 along a third direction.

[0067] Optionally, the air passage 322 may be provided with an anti-ionization structure, and / or the air passage 322 may extend in a meandering manner, and / or the air passage 322 may be a slit-shaped channel. All of the above structures can reduce the outflow of charged particles.

[0068] Reference Figure 4 In embodiments where each group of air passage components includes multiple air passages 322 spaced apart along a first direction, a closed space 323 is formed between any two adjacent air passages 322 along the first direction. The larger the closed space 323, the smaller the air passages 322 will be. In this case, the air passages 322 will be slit-like, preventing larger metal ions from being ejected. Conversely, if the closed space 323 is small, the air passages 322 will be larger, resulting in more metal ions being ejected from the air passages 322. Longitudinal stiffeners can be provided within the closed space 323 to support the air passages 322 and prevent deformation of the air passages 322.

[0069] In some embodiments, the number of the connecting port 210, the first pressure relief port 321, and the air venting channel 322 are all multiple and are arranged in a one-to-one correspondence. The air venting channel 322 is connected between the corresponding connecting port 210 and the corresponding first pressure relief port 321.

[0070] Reference Figure 8 In some embodiments, a pressure relief chamber 324 is provided inside the mask shell 300, and a notch is provided on the air passage 322, which communicates with the pressure relief chamber 324 through the notch. The pressure relief chamber 324 can relieve the air pressure in the air passage 322. A second pressure relief port 325 is provided on the outer wall of the pressure relief chamber 324 in a third direction, through which the gas entering the pressure relief chamber 324 can be discharged to the outside.

[0071] Continue to refer to Figure 3 In some embodiments, the mask shell 300 includes a first shell member 310 and a second shell member 320, the second shell member 320 being disposed at at least one end of the first shell member 310 along a third direction, and the first shell member 310, the second shell member 320, and the arc-extinguishing chamber shell 200 are not in communication.

[0072] A first pressure relief port 321 is provided on the wall panel of the second shell component 320 that is away from the first shell component 310.

[0073] In the above structure, the second housing component 320 has a first pressure relief port 321. Gas discharged from the communication port 210 of the arc-extinguishing chamber cover 200 enters the second housing component 320 and is then discharged to the outside through the first pressure relief port 321. Since the first housing component 310 is not connected to the second housing component 320 or the arc-extinguishing chamber cover 200, an installation space that can isolate gases and charged particles is formed inside the first housing component 310. Electrical components such as operating mechanisms, secondary circuit components, and circuit breaker accessories can be installed in this installation space.

[0074] Optionally, the number of second housing members 320 is one and is disposed at one end of the first housing member 310 along a third direction; or, the number of second housing members 320 is two and are respectively disposed at both ends of the first housing member 310 along a third direction.

[0075] Optionally, the mask shell 300 is integrally formed; or, the first shell component 310 and the second shell component 320 are spliced ​​together. In the embodiment where the first shell component 310 and the second shell component 320 are spliced ​​together, the first shell component 310 and the second shell component 320 can be detachably connected by means of screw connection, snap connection or other methods.

[0076] The pressure relief device provided in this application will be described in detail below with reference to several specific embodiments.

[0077] Example 1

[0078] Reference Figure 1 and Figure 2 In this embodiment, the two outer wall panels of the mask shell 300 along the third direction are respectively provided with a plurality of first pressure relief ports 321 arranged at intervals along the first direction; the two ends of the arc extinguishing chamber shell 200 along the third direction are respectively provided with a set of communication port assemblies, each set of communication port assemblies including a plurality of communication ports 210 arranged at intervals along the first direction; the two ends of the mask shell 300 along the third direction are respectively provided with a set of air passage assemblies, each set of air passage assemblies including a plurality of air passages 322 arranged at intervals along the first direction; refer to Figure 3 and Figure 4 The first pressure relief port 321 and the connecting port 210 are set in a one-to-one correspondence, and a gas passage 322 is provided between the corresponding set of first pressure relief ports 321 and connecting ports 210.

[0079] Reference Figure 5 and Figure 6 After the circuit breaker disconnects the current, some of the gas discharged from the arc-extinguishing chamber is discharged to the outside through the connecting port 210, the gas passage 322, and the first pressure relief port 321 in sequence. This multi-channel arrangement can buffer the impact force of the gas, thereby reducing the impact force of the gas entering the mask housing 300 and allowing the gas to be discharged smoothly.

[0080] Continue to refer to Figure 5 and Figure 6 Since the two sets of air passage assemblies are located at both ends of the face shield housing 300 along the third direction, an installation space is left in the middle of the face shield housing 300; the secondary circuit assembly of the circuit breaker is installed on the circuit breaker body 100 and located in the installation space, and the top of the face shield housing 300 is also provided with an opening for exposing the terminals of the secondary circuit wiring terminals 500 in the secondary circuit assembly.

[0081] Continue to refer to Figure 3 The mask shell 300 includes a first shell component 310 and two second shell components 320. The two second shell components 320 are respectively disposed at both ends of the first shell component 310 along a third direction. A first pressure relief port 321 is provided on the wall panel of the second shell component 320 away from the first shell component 310.

[0082] Furthermore, combined Figure 3 and Figure 4 The mask shell 300 also includes a first longitudinal stiffener 330, and the second shell component 320 includes a second component front wall and a second component side wall;

[0083] The first longitudinal stiffener 330 and the second component sidewall are respectively connected to the two ends of the front wall of the second component along the third direction, and the first longitudinal stiffener 330 is arranged between the first shell component 310 and the second shell component 320.

[0084] A plurality of transverse stiffeners 340 are laid flat between the first longitudinal stiffener 330 and the side wall of the second component, and a ventilation channel 322 is formed between two adjacent transverse stiffeners 340, the first longitudinal stiffener 330, the front wall of the second component, and the side wall of the second component.

[0085] Specifically, there are two first longitudinal stiffeners 330, which are respectively located at both ends of the first shell member 310 along the third direction. The two first longitudinal stiffeners 330 can separate the first shell member 310 from the two second shell members 320, ensuring that the first shell member 310 and the two second shell members 320 are not connected. Between each group of first longitudinal stiffeners 330 and the side wall of the second member, a plurality of transverse stiffeners 340 are laid flat and spaced apart along the first direction. A ventilation channel 322 is formed between two adjacent transverse stiffeners 340, the first longitudinal stiffeners 330, the front wall of the second member, and the side wall of the second member. The ventilation channel 322 has an inlet at its rear end and an outlet at its end away from the first longitudinal stiffeners 330. The inlet of the ventilation channel 322 corresponds to the position of the connecting port 210, and the outlet of the ventilation channel 322 corresponds to the position of the first pressure relief port 321.

[0086] In this embodiment, a closed space 323 is formed between two adjacent transverse stiffeners 340, the first longitudinal stiffener 330, the front wall of the second component, and the side wall of the second component. The air passage 322 and the closed space 323 are alternately arranged along a first direction. By adjusting the height of the closed space 323, the height of the air passage 322 can be adjusted, making the air passage 322 a slit-like channel, which can effectively block the outward discharge of charged particles while venting air. To prevent deformation of the air passage 322, longitudinal stiffeners can be provided within the closed space 323.

[0087] Example 2

[0088] Reference Figure 7 and Figure 8 The difference between this embodiment and Embodiment 1 is that:

[0089] In this embodiment, a pressure relief chamber 324 is provided inside the second housing component 320, and the air passage 322 is connected to the pressure relief chamber 324.

[0090] Specifically, the gas venting channel 322 has a notch in the middle, which connects it to the pressure relief chamber 324. The pressure relief chamber 324 can relieve the gas pressure in the gas venting channel 322, preventing excessively high pressure and allowing the gas to be discharged more smoothly. The pressure relief chamber 324 has multiple second pressure relief ports 325 arranged at intervals along the first direction on its outer wall in the third direction. Gas entering the pressure relief chamber 324 can be quickly discharged to the outside through the second pressure relief ports 325.

[0091] like Figure 8 As shown, since the gap in the middle of the air passage 322 will also cause the closed space 323 to have a gap, a sealing rib 360 is also provided between the two transverse ribs 340 that form the closed space 323 to support the closed space 323 and the air passage 322 and prevent them from deforming under the impact of airflow.

[0092] Furthermore, the second housing component 320 is provided with a mounting cavity 326, which is not connected to the air passage 322. Specifically, the second housing component 320 is also provided with a second longitudinal stiffener 350, which is positioned between the mounting cavity 326 and the pressure relief cavity 324. The mounting cavity 326 is formed between the second longitudinal stiffener 350 and the first longitudinal stiffener 330, and the pressure relief cavity 324 is formed between the second longitudinal stiffener 350 and the side wall of the second component. The notch on the air passage 322 is located between the second longitudinal stiffener 350 and the side wall of the second component. By providing the mounting cavity 326 in the second housing component 320, the mounting space inside the face shield 300 can be increased, thereby accommodating more electrical components.

[0093] In the above structure, some or all of the first shell component 310, the second shell component 320, the first longitudinal stiffener 330, the transverse stiffener 340, the second longitudinal stiffener 350, and the sealing stiffener 360 are manufactured using an integral molding process.

[0094] For example, in one embodiment, the second housing member 320, the first longitudinal stiffener 330, the transverse stiffener 340, the second longitudinal stiffener 350, and the sealing stiffener 360 on the same side are integrally formed into a single structure, which is detachably connected to the first housing member 310.

[0095] As mentioned above, the mask shell 300 can be assembled into a single unit by integral molding or splicing, or by a combination of integral molding and splicing. The processing method of the mask shell 300 is not limited here.

[0096] Based on the above structure, a deionization structure can be provided inside the pressure relief chamber 324 to block charged particles in the gas within the pressure relief chamber 324, thereby reducing the outward discharge of charged particles.

[0097] Optionally, the defree structure includes one or more of a perforated plate, a metal mesh, and a wound metal wire.

[0098] When the deionization structure includes a porous plate (or metal mesh), the porous plate (or metal mesh) is approximately parallel to the sidewall of the second component and located between the notch on the second pressure relief port 325 and the gas venting channel 322. Thus, as the gas is discharged outward from the notch on the gas venting channel 322 and the second pressure relief port 325, it must pass through the porous plate (or metal mesh), thereby blocking charged particles within the pressure relief chamber 324. The number of porous plates (or metal mesh) can be one or more, and is not limited here.

[0099] When the de-free structure includes a wound metal wire, the wound metal wire can be directly and elastically filled into the pressure relief chamber 324, using the air gap naturally formed within the metal wire bundle to block the outward discharge of metal particles.

[0100] In addition, a de-freezing structure can also be provided in the air passage 322. Since the air passage 322 is relatively narrow, it is preferable to fill the air passage 322 with metal wire.

[0101] Example 3

[0102] Reference Figure 9 In this embodiment, the air passage 322 extends in a meandering manner, forming a labyrinthine structure that can both facilitate air passage and prevent metal ions from being ejected from the air passage 322.

[0103] Example 4

[0104] Reference Figure 10 The difference between this embodiment and Embodiment 1 is that:

[0105] In this embodiment, the two outer wall panels of the mask shell 300 along the third direction are respectively provided with a plurality of first pressure relief ports 321 arranged at intervals along the first direction; the two ends of the arc extinguishing chamber shell 200 along the third direction are respectively provided with a set of communication port assemblies, each set of communication port assemblies including a plurality of communication ports 210 arranged at intervals along the first direction; the two ends of the mask shell 300 along the third direction are respectively provided with a set of air passage assemblies, each set of air passage assemblies including an air passage 322; the two sets of communication port assemblies and the two air passages 322 are arranged in a one-to-one correspondence, the inlet range of each air passage 322 covers all the communication ports 210 of the corresponding communication port assembly, and the outlet range of each air passage 322 covers all the first pressure relief ports 321 on the adjacent outer wall panel.

[0106] Specifically, a transverse stiffener 340 is laid flat between each group of first longitudinal stiffeners 330 and second component sidewalls. The first longitudinal stiffeners 330, transverse stiffeners 340, second component sidewalls and top wall of second shell component 320 form an air passage 322. All first pressure relief ports 321 on the second component sidewall are located within the outlet range of the air passage 322.

[0107] In this embodiment, the gas passage 322 is equivalent to a buffer cavity. Gas discharged from the connecting port 210 enters this buffer cavity for diffusion and pressure relief, and then exits from the first pressure relief port 321. An anti-ionization structure can also be provided inside the first pressure relief port 321. For example, the anti-ionization structure can be attached to the inner side of the sidewall of the second component and cover all the first pressure relief ports 321, thereby blocking charged particles.

[0108] In summary, the pressure relief device provided in this application adds an exhaust and pressure relief path to the circuit breaker, allowing the gas inside the arc-extinguishing chamber housing 200 to be discharged in four directions: front, back, left, and right. Gas discharged from the front of the arc-extinguishing chamber housing 200 is guided to the left and right ends of the faceplate housing 300 for discharge, preventing airflow carrying charged particles from rushing towards the operator and electrical components on the front of the circuit breaker, thus improving the circuit breaker's breaking capacity, performance, and service life. To ensure that the gas entering the faceplate housing 300 does not flow towards the electrical components, a gas passage 322 can be provided inside the faceplate housing 300 to guide the gas discharged from the connecting port 210 to the first pressure relief port 321. The gas passage 322 can be a slit-shaped channel and / or a labyrinthine channel. An anti-ionization structure can also be provided inside the gas passage 322 to effectively block the discharge of charged particles while venting the gas. To prevent deformation caused by excessive air pressure in the air passage 322, a pressure relief chamber 324 connected to the air passage 322 can be provided inside the mask shell 300. Some of the gas entering the air passage 322 can enter the pressure relief chamber 324 to be temporarily discharged, thereby improving the structural strength and pressure relief effect of the pressure relief device.

[0109] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A pressure relief device for a circuit breaker, comprising a circuit breaker body (100), an arc-extinguishing chamber housing (200), and a faceplate housing (300), wherein, The arc-extinguishing chamber housing (200) is disposed over one end of the circuit breaker body (100) along a first direction, and the face shield housing (300) is disposed over one end of the circuit breaker body (100) along a second direction. The arc-extinguishing chamber housing (200) has a communication port (210) on its outer wall panel near the face shield housing (300), and a first pressure relief port (321) is disposed on at least one outer wall panel of the face shield housing (300) along a third direction. The communication port (210) and the first pressure relief port (321) are connected.

2. The pressure relief device of claim 1, wherein, At least one of the first pressure relief ports (321) is provided on each of the two outer wall panels along the third direction of the mask shell (300); The number of the communication ports (210) is multiple and they are divided into two groups of communication port assemblies. The two groups of communication port assemblies are respectively located at both ends of the arc-extinguishing chamber housing (200) along the third direction. Each group of communication port assemblies includes at least one of the communication ports (210).

3. The pressure relief device of claim 1, wherein, The mask housing (300) is provided with an air passage (322), which is connected between the communication port (210) and the first pressure relief port (321).

4. The pressure relief device of claim 3, wherein, The mask shell (300) has a set of air passage assembly at one end of the outer wall plate near the first pressure relief port (321), and the air passage assembly includes one or more of the air passages (322); When each group of the air vent assembly includes one air vent (322), the outlet range of the air vent (322) covers all the first pressure relief ports (321) on the adjacent outer wall panel; When each group of air venting channel assemblies includes multiple air venting channels (322), the multiple air venting channels (322) in each group of air venting channel assemblies are arranged at intervals along the first direction, and one or more of the first pressure relief ports (321) are correspondingly provided at the outlet of each air venting channel (322).

5. The pressure relief device of claim 3, wherein, The number of the connecting port (210), the first pressure relief port (321) and the air venting channel (322) are all multiple and are arranged in a one-to-one correspondence. The air venting channel (322) is connected between the corresponding connecting port (210) and the corresponding first pressure relief port (321). And / or, a pressure relief chamber (324) is provided inside the mask shell (300), and a notch is provided on the air passage (322), and the air passage (322) communicates with the pressure relief chamber (324) through the notch.

6. The pressure relief device of claim 5, wherein, The pressure relief chamber (324) has a second pressure relief port (325) on its outer wall in the third direction; And / or, the air passage (322) and / or the pressure relief chamber (324) are provided with a deionization structure; And / or, the air passage (322) is a slit-shaped passage; And / or, the air passage (322) extends in a meandering manner.

7. The pressure relief device of claim 1, wherein, The mask shell (300) includes a first shell component (310) and a second shell component (320), the second shell component (320) is disposed at at least one end of the first shell component (310) along the third direction, and the first shell component (310), the second shell component (320) and the arc-extinguishing chamber shell (200) are not in communication; The first pressure relief port (321) is provided on the wall panel of the second housing member (320) away from the first housing member (310).

8. The pressure relief device of claim 7, wherein, The mask shell (300) further includes a first longitudinal stiffener (330), and the second shell component (320) includes a second component front wall and a second component side wall; The first longitudinal stiffener (330) and the second component sidewall are respectively connected to the two ends of the front wall of the second component along the third direction, and the first longitudinal stiffener (330) is arranged between the first shell component (310) and the second shell component (320); A plurality of transverse stiffeners (340) are laid flat between the first longitudinal stiffener (330) and the side wall of the second component, and a ventilation channel (322) is formed between two adjacent or adjacent transverse stiffeners (340), the first longitudinal stiffener (330), the front wall of the second component and the side wall of the second component.

9. The pressure relief device of claim 8, wherein, The second housing component (320) is provided with a pressure relief chamber (324), and the air passage (322) is connected to the pressure relief chamber (324); And / or, the second housing component (320) is provided with a mounting cavity (326), which is not connected to the air passage (322).

10. The pressure relief device of claim 7, wherein, The number of the second housing members (320) is two, and they are respectively disposed at both ends of the first housing member (310) along the third direction; And / or, the mask shell (300) is integrally formed or the first shell component (310) and the second shell component (320) are spliced ​​together.

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