Air outlet structure and circuit breaker

Abstract

The utility model relates to the technical field of low-voltage electric appliances, in particular to an air outlet structure and a circuit breaker. The circuit breaker comprises a shell, and the shell is provided with a first air outlet. The air outlet structure comprises a shielding plate which is used for shielding the first air outlet; the shielding plate has a closed state and an open state, and when the shielding plate is in the closed state, a second air outlet is formed between the shielding plate and the shell; when the shielding plate is in the open state, a third air outlet is formed between the shielding plate and the shell; the second air outlet and the third air outlet are both communicated with the first air outlet, and the opening area of the second air outlet is smaller than that of the third air outlet. When the circuit breaker operates normally, the shielding plate is in a closed state, so that sundries such as sand wind can be effectively prevented from entering the shell; when the circuit breaker breaks down, the shielding plate is in an open state, so that outward transmission of gas and heat in the circuit breaker is not affected.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to an air outlet structure and a circuit breaker. Background Art

[0002] With the development of areas with harsh environments, some circuit breakers need to be used in areas with very harsh environments (such as desert areas). This requires that the circuit breaker housing needs to have a certain ability to prevent wind and sand to ensure that the electrical components inside the housing are not disturbed by wind and sand, thereby preventing the circuit breaker from failing.

[0003] In order to prevent wind and sand from entering the inside of the circuit breaker, some circuit breaker shells minimize the opening area of ​​the air outlet; however, the circuit breaker will generate a large amount of gas and heat during operation. The reduction in the opening area of ​​the air outlet causes this part of the gas and heat to not be transferred out in time by heat convection, which will inevitably cause damage to the electrical components in the circuit breaker.

[0004] Therefore, how to protect the electrical components inside the circuit breaker housing from being disturbed by wind and sand while not affecting the transfer of gas and heat inside the circuit breaker to the outside has become a technical problem that technical personnel in this field urgently need to solve. Utility Model Content

[0005] The first object of the utility model is to provide an air outlet structure to solve the technical problem of how to protect the electrical components inside the circuit breaker housing from being disturbed by wind and sand in the prior art without affecting the gas and heat inside the circuit breaker to be transferred to the outside.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] An air outlet structure is applied to a circuit breaker, the circuit breaker comprises a housing, a first air outlet is arranged on the housing, the air outlet structure comprises a shielding plate, the shielding plate is used to shield the first air outlet;

[0008] The shielding plate has a closed state and an open state, wherein: when the shielding plate is in the closed state, a second air outlet is formed between the shielding plate and the shell; when the shielding plate is in the open state, a third air outlet is formed between the shielding plate and the shell;

[0009] The second air outlet and the third air outlet are both communicated with the first air outlet, and an opening area of ​​the second air outlet is smaller than an opening area of ​​the third air outlet.

[0010] Further, the shielding plate has a fixed end and a free end that are arranged opposite to each other, the fixed end of the shielding plate is rotatably connected to the shell, and the shielding plate is configured to switch between the closed state and the open state by rotating relative to the shell;

[0011] Alternatively, the shielding plate is slidably mounted on the housing, and the shielding plate is configured to switch between the closed state and the open state by linearly moving relative to the housing.

[0012] Furthermore, it also includes a limit bar arranged on the shell, and the limit bar is provided with an inclined surface, and the inclined surface is inclined from the fixed end of the shielding plate to the free end of the shielding plate toward the rotation and opening direction of the shielding plate; the shielding plate is overlapped on the inclined surface.

[0013] Furthermore, it also includes a locking groove arranged on the shell, and the locking groove is plugged and matched with the shielding plate.

[0014] Furthermore, the shielding plate is T-shaped, and includes a main body and plug-in parts arranged on both sides of the main body, and the plug-in parts are plug-fitted with the locking grooves.

[0015] Furthermore, it also includes a first outer end surface provided on the shell, and the first air outlet is provided on the first outer end surface;

[0016] An air outlet groove is arranged on the first outer end surface. When the shielding plate is in a closed state, the shielding plate contacts the first outer end surface and surrounds the air outlet groove to form the second air outlet. The shielding plate has a certain angle relative to the horizontal plane.

[0017] Further, the shielding plate can be switched from the open state to the closed state under the action of gravity;

[0018] And / or, it further includes an elastic member, wherein the elastic member is connected between the shielding plate and the shell, and is used to drive the shielding plate to switch from the open state to the closed state.

[0019] Furthermore, the shielding plate is provided with heat dissipation slots, or the shielding plate is in a mesh structure.

[0020] The second object of the present utility model is to provide a circuit breaker, comprising a housing and at least one air outlet structure as described in any one of the above items.

[0021] Furthermore, the shell includes a base and a middle cover connected to each other, and at least two baffles are arranged on the outer end surface of the middle cover, and an air outlet channel is formed between any two adjacent baffles;

[0022] The circuit breaker also includes at least one wiring terminal, at least one wiring terminal is arranged in a one-to-one correspondence in at least one of the air outlet channels, a corresponding group of the wiring terminals and the air outlet channels are surrounded to form a protective space, and at least one of the air outlet structures is arranged in a one-to-one correspondence in at least one of the protective spaces.

[0023] Beneficial effects of the utility model:

[0024] The utility model provides an air outlet structure applied to a circuit breaker and a circuit breaker, the circuit breaker comprising a shell, on which a first air outlet is arranged; the air outlet structure comprises a shielding plate, which is used for shielding the first air outlet; the shielding plate has a closed state and an open state, wherein: when the shielding plate is in the closed state, a second air outlet is formed between the shielding plate and the shell; when the shielding plate is in the open state, a third air outlet is formed between the shielding plate and the shell; the second air outlet and the third air outlet are both connected to the first air outlet, and the opening area of ​​the second air outlet is smaller than the opening area of ​​the third air outlet.

[0025] The shielding plate in the air outlet structure provided in the present application has a closed state and an open state, wherein: when the circuit breaker is operating normally, the shielding plate is in a closed state, at this time, the second air outlet formed between the shielding plate and the shell has a smaller opening area, thereby effectively blocking wind and sand and other debris from entering the shell, protecting the electrical components inside the circuit breaker shell from interference from wind and sand, and dissipating heat; when the circuit breaker fails, the shielding plate is in an open state, at this time, the third air outlet formed between the shielding plate and the shell has a larger opening area, and the heat and gas in the circuit breaker can be quickly transferred to the outside through the third air outlet, thereby not affecting the gas and heat inside the circuit breaker to be transferred to the outside. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A cross-sectional view of the air outlet structure provided in the first embodiment of the utility model applied to a circuit breaker Figure 1 ;

[0028] Figure 2 A cross-sectional view of the air outlet structure provided in the first embodiment of the utility model applied to a circuit breaker Figure 2 ;

[0029] Figure 3 for Figure 1 A magnified view at point A;

[0030] Figure 4 for Figure 2 Enlarged view at B;

[0031] Figure 5 A schematic diagram of the three-dimensional structure of the air outlet structure provided in the first embodiment of the utility model after removing the shielding plate;

[0032] Figure 6 for Figure 5 Enlarged view at C;

[0033] Figure 7 Schematic diagram of the three-dimensional structure of the shielding plate provided in the first embodiment of the utility model Figure 1 ;

[0034] Figure 8 Schematic diagram of the three-dimensional structure of the shielding plate provided in the first embodiment of the utility model Figure 2 ;

[0035] Fig. 9 A schematic diagram of a connection structure between a shielding plate and a clamping groove provided in the first embodiment of the utility model;

[0036] Fig.10 Schematic diagram of the three-dimensional structure of the shielding plate provided in the first embodiment of the utility model Figure 3 ;

[0037] Fig.11 A cross-sectional schematic diagram of the air outlet structure provided in the second embodiment of the utility model;

[0038] Fig.12 A cross-sectional schematic diagram of the air outlet structure provided in Embodiment 3 of the present utility model;

[0039] Fig.13 A schematic diagram of the three-dimensional structure of the shielding plate provided in the third embodiment of the present utility model;

[0040] Fig.14 A schematic diagram of the three-dimensional structure of the shielding plate provided in the fourth embodiment of the utility model;

[0041] Fig.15 A schematic diagram of the three-dimensional structure of the shielding plate provided in the fifth embodiment of the present utility model;

[0042] Fig.16 A schematic diagram of the three-dimensional structure of a circuit breaker provided in the sixth embodiment of the utility model Figure 1 ;

[0043] Fig.17 A schematic diagram of the three-dimensional structure of a circuit breaker provided in the sixth embodiment of the utility model Figure 2 .

[0044] icon:

[0045] 110-housing; 111-first air outlet; 112-base; 113-middle cover; 1131-baffle; 114-protection space; 115-upper cover; 120-connection terminal; 130-busbar;

[0046] 1- shielding plate; 11- main body; 12- plug-in part; 13- heat dissipation seam; 14- gap; 15- reinforcing rib; 2- second air outlet; 3- third air outlet; 4- limiting strip; 41- inclined surface; 5- positioning groove; 6- first outer end surface; 61- air outlet groove; 7- elastic member; 8- limiting rod. DETAILED DESCRIPTION

[0047] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0048] It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0049] It should be noted that in the description of the present invention, the terms "connection" and "installation" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or connected through an intermediate medium; it can be a mechanical connection or an electrical connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] Reference Figure 1 and Figure 2The circuit breaker includes a housing 110, and a first air outlet 111 is provided on the housing 110; the first air outlet 111 is composed of at least one air hole connecting the inside and outside of the housing 110. During the operation of the circuit breaker, the heat and gas in the housing 110 are discharged to the outside through the first air outlet 111. For circuit breakers used in harsh environments such as deserts, external sand and other debris can easily enter the circuit breaker through the first air outlet 111, causing damage to the electrical components inside the circuit breaker, thereby affecting the performance and electrical life of the circuit breaker.

[0051] Based on this, the utility model provides an air outlet structure applied to the above circuit breaker, referring to Figure 3 and Figure 4 The air outlet structure includes a shielding plate 1, and the shielding plate 1 is used to shield the first air outlet 111;

[0052] The shielding plate 1 has a closed state and an open state, wherein: when the shielding plate 1 is in the closed state, a second air outlet 2 is formed between the shielding plate 1 and the housing 110; when the shielding plate 1 is in the open state, a third air outlet 3 is formed between the shielding plate 1 and the housing 110;

[0053] The second air outlet 2 and the third air outlet 3 are both connected to the first air outlet 111 , and the opening area of ​​the second air outlet 2 is smaller than the opening area of ​​the third air outlet 3 .

[0054] Reference Figure 3 When the circuit breaker operates normally, the shielding plate 1 is in a closed state, and a second air outlet 2 is formed between the shielding plate 1 and the housing 110. The heat in the circuit breaker is transferred to the outside through the first air outlet 111 and the second air outlet 2 in sequence. Figure 4 When the circuit breaker fails (such as a short circuit), a large amount of heat and gas are generated in the shell 110. At this time, the shielding plate 1 is in an open state, and a third air outlet 3 is formed between the shielding plate 1 and the shell 110. The heat and gas in the circuit breaker are quickly transferred to the outside through the first air outlet 111 and the third air outlet 3 in turn by utilizing the internal and external pressure difference.

[0055] From the above, it can be seen that the shielding plate 1 in the air outlet structure provided in the present application has a closed state and an open state, wherein: when the circuit breaker is operating normally, the shielding plate 1 is in a closed state, at this time, the second air outlet 2 formed between the shielding plate 1 and the shell 110 has a smaller opening area, so that the circuit breaker can be cooled, and at the same time, the wind and sand and other debris are effectively blocked from entering the shell 110, thereby protecting the electrical components inside the circuit breaker shell from interference from the wind and sand; when the circuit breaker is opened or fails, the shielding plate 1 is in an open state, at this time, the third air outlet 3 formed between the shielding plate 1 and the shell 110 has a larger opening area, and the heat and gas in the circuit breaker can be quickly transferred to the outside through the third air outlet 3, thereby not affecting the gas and heat inside the circuit breaker. Transfer to the outside.

[0056] It should be noted that the shielding plate 1 can be made of plastic or metal such as stainless steel, iron, etc., which is not limited here; the size of the shielding plate 1 can be adaptively adjusted according to the opening area of ​​the first air outlet 111, which is not limited here.

[0057] The following are several specific embodiments provided by the present application. The present application will be described in detail through the specific embodiments.

[0058] Embodiment 1

[0059] Embodiment 1 of the present application provides an air outlet structure, referring to Figure 3 and Figure 4 The shielding plate 1 has a fixed end and a free end that are relatively arranged. The fixed end of the shielding plate 1 is rotatably connected to the housing 110. The shielding plate 1 is configured to switch between a closed state and an open state by rotating relative to the housing 110.

[0060] When the circuit breaker fails, a large amount of heat and gas is generated in the housing 110 , and the gas impacts the shielding plate 1 and pushes the shielding plate 1 to rotate relative to the housing 110 , thereby switching the shielding plate 1 from a closed state to an open state.

[0061] As an optional embodiment, the shielding plate 1 can be switched from an open state to a closed state under the action of gravity. Figure 4 When most of the gas in the shell 110 is transferred to the outside, the shielding plate 1 is no longer impacted by the gas from the inside to the outside. Therefore, the free end of the shielding plate 1 naturally falls under the action of gravity, so that the shielding plate 1 switches from the open state to the closed state.

[0062] Continue to refer to Figure 3 and Figure 4The air outlet structure also includes a limit strip 4 arranged on the shell 110, and a slope 41 is arranged on the limit strip 4. The slope 41 is inclined from the fixed end of the shielding plate 1 to the free end of the shielding plate 1 in the direction of rotation and opening of the shielding plate 1; the shielding plate 1 is overlapped on the slope 41.

[0063] Reference Figure 3 When the shielding plate 1 is in the closed state, the bottom surface of the shielding plate 1 overlaps the top edge of the inclined surface 41. At this time, the shielding plate 1 and the inclined surface 41 are in line contact; refer to Figure 4 When the shielding plate 1 is in the open state, the shielding plate 1 is in contact with the inclined surface 41, and at this time, the inclined surface 41 can prevent the shielding plate 1 from continuing to rotate. In the above structure, by changing the inclination angle of the inclined surface 41, the rotation angle of the shielding plate 1 relative to the housing 110 can be changed, thereby changing the opening area of ​​the third air outlet 3.

[0064] In this embodiment, when the shielding plate 1 is in the closed state, the shielding plate 1 has a certain angle relative to the horizontal plane; during the process of switching the shielding plate 1 from the closed state to the open state, the inclination angle of the shielding plate 1 relative to the horizontal plane gradually increases. The above arrangement enables the dust on the shielding plate 1 to slide off the shielding plate 1 under the dual effects of gravity and / or the vibration force generated when the circuit breaker fails during the process of switching the shielding plate 1 between the open state and the closed state.

[0065] Reference Figure 5 and Figure 6 The air outlet structure further includes a positioning groove 5 provided on the housing 110 , and the positioning groove 5 is plugged into and matched with the shielding plate 1 .

[0066] Reference Figure 6 and Figure 7 In this embodiment, the shielding plate 1 is T-shaped, and includes a main body 11 and plug-in parts 12 disposed on both sides of the main body 11, and the plug-in parts 12 are plugged into the positioning slots 5. Specifically, the two plug-in parts 12 are located at the fixed end of the shielding plate 1, and the number of the positioning slots 5 is two. The two plug-in parts 12 correspond to each other and are plugged into the two positioning slots 5; the movable amount of the plug-in parts 12 needs to be reserved in the positioning slots 5 so that the shielding plate 1 can rotate relative to the housing 110.

[0067] Reference Figure 8 and Fig. 9 As an optional embodiment, there is a gap 14 between each plug-in portion 12 and the main body 11, and a limiting protrusion is provided in the positioning groove 5 to be plugged and matched with the gap 14. Through the plug-in and match between the gap 14 and the limiting protrusion, the freedom of the shielding plate 1 relative to the housing 110 can be further limited, so that the shielding plate 1 is not easy to fall off the housing 110. When processing, the above-mentioned shielding plate 1 can be integrally formed by a cutting process.

[0068] Since the present embodiment adopts a plug-in connection method between the shielding plate 1 and the shell 110, when the shielding plate 1 needs to be disassembled, the shielding plate 1 only needs to be pulled out or inserted into the shell 110, thereby improving the convenience of the shielding plate 1 during disassembly and assembly.

[0069] In other embodiments, the shielding plate 1 and the housing 110 may also be connected in a shaft-hole matching manner, as long as the shielding plate 1 can rotate relative to the housing 110 , and no limitation is made here.

[0070] Reference Fig.10 As an optional embodiment, a reinforcing rib 15 is provided on the end surface of the shielding plate 1 away from the housing 110. Exemplarily, at least one edge of the shielding plate 1 is bent in a direction away from the housing 110 to form the reinforcing rib 15; Fig.10 In the illustrated embodiment, except for one edge at the fixed end, the other three edges of the shielding plate 1 are bent away from the housing 110 to form reinforcing ribs 15. Providing the reinforcing ribs 15 can improve the structural strength of the shielding plate 1 and prevent the shielding plate 1 from deformation.

[0071] Continue to refer to Figure 6 , the air outlet structure further includes a first outer end surface 6 disposed on the outer end surface of the shell 110, and the first air outlet 111 is disposed on the first outer end surface 6;

[0072] An air outlet groove 61 is provided on the first outer end surface 6 . When the shielding plate 1 is in a closed state, the shielding plate 1 contacts the first outer end surface 6 and surrounds the air outlet groove 61 to form a second air outlet 2 .

[0073] Specifically, the air outlet groove 61 is located on one side of the first air outlet 111 close to the movable end of the shielding plate 1; a plurality of protrusions arranged side by side and spaced apart are formed on the first outer end surface 6, and an air outlet groove 61 is formed between any two adjacent protrusions. When the shielding plate 1 is in a closed state, the shielding plate 1 contacts the first outer end surface 6 (specifically, the top surface of the protrusions) and is surrounded by the air outlet groove 61 to form a second air outlet 2; when the shielding plate 1 is in an open state, a third air outlet 3 is formed between the shielding plate 1 and the first outer end surface 6.

[0074] In the above structure, since the second air outlet 2 is located between the first outer end face 6 and the shielding plate 1, its position is relatively hidden and the opening area is relatively small, so it can effectively prevent foreign debris from entering the housing 110; since the opening area of ​​the third air outlet 3 is much larger than the second air outlet 2, the gas in the housing 110 can be quickly discharged, avoiding the problem that a large amount of heat and gas accumulate in the housing 110 for a long time and cause damage to the electrical components in the circuit breaker. In addition, when the shielding plate 1 is in a closed state, the movable end of the shielding plate 1 contacts the protrusion on the first outer end face 6, and the protrusion makes the shielding plate 1 have a certain angle relative to the horizontal plane.

[0075] Embodiment 2

[0076] Embodiment 2 of the present application provides an air outlet structure, which is an expansion solution based on embodiment 1.

[0077] Reference Fig.11 The air outlet structure further includes an elastic member 7, which is connected between the shielding plate 1 and the housing 110 and is used to drive the shielding plate 1 to switch from an open state to a closed state.

[0078] In this embodiment, the elastic member 7 is specifically a torsion spring, which includes a torsion spring body and two pins extending from the torsion spring body, wherein: the torsion spring body is mounted on a mounting shaft, and both ends of the mounting shaft are fixed on the shell 110; the two pins are in contact with the shielding plate 1 and the shell 110 respectively.

[0079] In the above structure, the elastic member 7 is used to drive the free end of the shielding plate 1 to rotate toward the shell 110, thereby ensuring that the shielding plate 1 switches from the open state to the free state; in addition, since the switching of the state of the shielding plate 1 is not affected by gravity, the circuit breaker does not need to consider the orientation when installing.

[0080] Embodiment 3

[0081] Embodiment 3 of the present application provides an air outlet structure, which is different from Embodiment 1 and Embodiment 2 in that: in this embodiment, the shielding plate 1 is slidably mounted on the shell 110, and the shielding plate 1 is configured to switch between a closed state and an open state by moving linearly relative to the shell 110.

[0082] Reference Fig.12 The air outlet structure also includes an elastic member 7 and a limiting rod 8, wherein: the limiting rod 8 passes through the end surface where the first air outlet 111 is located and the shielding plate 1; the elastic member 7 is specifically a compression spring, which is mounted on the limiting rod 8 and can provide an elastic force to drive the shielding plate 1 to move in a direction close to the shell 110.

[0083] Specifically, an annular protrusion is provided on the circumferential surface of one end of the limiting rod 8, and the end of the limiting rod 8 away from the annular protrusion successively penetrates the end surface where the first air outlet 111 is located, the shielding plate 1 and the elastic member 7, and the part of the limiting rod 8 passing through the elastic member 7 is equipped with a washer and a nut; the two ends of the elastic member 7 are respectively abutted against the washer and the shielding plate 1, thereby being able to push the shielding plate 1 to move in a direction close to the shell 110.

[0084] Optionally, the number of the limiting rods 8 may be one or more.

[0085] Reference Fig.13 In this embodiment, the shielding plate 1 can be rectangular or square.

[0086] It should be noted that the shape of the shielding plate 1 is not limited as long as it can block the first air outlet 111 and the second air outlet 2 .

[0087] Embodiment 4

[0088] Reference Fig.14 In this embodiment, a heat dissipation slit 13 is provided on the shielding plate 1. The number of the heat dissipation slit 13 can be one or more. When the number of the heat dissipation slit 13 is multiple, the multiple heat dissipation slits 13 are distributed in an array on the shielding plate 1. The gap of the heat dissipation slit 13 is adaptively adjusted according to the application environment of the circuit breaker, so as to improve the heat dissipation efficiency on the basis of effectively preventing debris from entering the interior of the housing 110.

[0089] Optionally, the heat dissipation slit 13 can be formed by cutting on the shielding plate 1 with a knife, and the slit is very small, so the circuit breaker can be cooled under the premise of preventing wind and sand.

[0090] Embodiment 5

[0091] Reference Fig.15 In this embodiment, the shielding plate 1 is a mesh structure. The size of the mesh opening of the shielding plate 1 is adaptively adjusted according to the application environment of the circuit breaker, so as to effectively prevent debris from entering the interior of the housing 110 and improve the heat dissipation efficiency.

[0092] Embodiment 6

[0093] The utility model provides a circuit breaker according to the sixth embodiment. Fig.16 The circuit breaker includes a housing 110 and at least one air outlet structure as described in any of the above embodiments.

[0094] It should be noted that the number of the air outlet structures is adaptively adjusted according to the model of the circuit breaker and the user's usage requirements, and is not limited here.

[0095] In this embodiment, the shell 110 includes a base 112, a middle cover 113 and an upper cover 115 which are connected in sequence. At least two baffles 1131 are arranged on the outer end surface of the middle cover 113, and an air outlet channel is formed between any two adjacent baffles 1131; in this embodiment, the first outer end surface 6 is also an outer end surface of the middle cover 113.

[0096] The circuit breaker also includes at least one wiring terminal 120, at least one wiring terminal 120 is arranged in at least one air outlet channel in a one-to-one correspondence, a corresponding group of wiring terminals 120 and the air outlet channel are surrounded to form a protective space 114, and at least one air outlet structure is arranged in at least one protective space 114 in a one-to-one correspondence.

[0097] Reference Fig.17 The circuit breaker further includes at least one busbar 130, and the at least one busbar 130 corresponds to and is connected to at least one terminal 120. The busbar 130 can be fixed on the base 112 by screws, and is used to connect an external circuit.

[0098] In the above structure, the provision of the protective space 114 improves the concealment of the air outlet structure, and the protective space 114 can reduce the force and speed of external wind and sand impacting the shielding plate 1, thereby further preventing external debris from entering the circuit breaker.

[0099] Continue to refer to Fig.16 In this embodiment, the shielding plate 1 has a fixed end and a free end that are relatively arranged, wherein: the fixed end of the shielding plate 1 is rotatably connected to the shell 110, and the movable end of the shielding plate 1 faces the corresponding wiring terminal 120.

[0100] The working principle of the circuit breaker provided in this embodiment is as follows:

[0101] When the circuit breaker operates normally, the shielding plate 1 is in a closed state; at this time, a second air outlet 2 is formed between the movable end of the shielding plate 1 and the first outer end surface 6, and the heat in the shell 110 is discharged to the outside through the second air outlet 2; the second air outlet 2 is hidden in the space surrounded by the shielding plate 1, the terminal 120 and two adjacent baffles 1131, so it can effectively prevent wind, sand and other debris from entering the shell 110 while dissipating heat.

[0102] When the circuit breaker fails, a large amount of heat and gas are generated in the shell 110. These gases impact the shielding plate 1 and push the movable end of the shielding plate 1 to rotate to a set position in a direction away from the shell 110, thereby switching the shielding plate 1 from a closed state to an open state; at this time, a third air outlet 3 is formed between the shielding plate 1 and the first outer end face 6, and the heat and gas in the shell 110 are discharged to the outside through the third air outlet 3. Under the blowing of the airflow, sand and other debris will not enter the shell 110 through the third air outlet 3.

[0103] When most of the gas in the shell 110 is discharged to the outside through the third air outlet 3, the shielding plate 1 is affected by gravity and / or the elastic force of the elastic member 7, and the movable end of the shielding plate 1 rotates toward the direction close to the shell 110 to return to the closed state; in the process of switching the state of the shielding plate 1, the wind and sand on the shielding plate 1 slide off the circuit breaker due to the blowing force of the air, gravity and the vibration force generated when the circuit breaker fails.

[0104] In summary, the circuit breaker provided in this embodiment effectively blocks external wind and sand from entering the circuit breaker by means of the shielding plate 1 disposed at the first air outlet 111, thereby preventing the electrical components inside the circuit breaker from being disturbed by the wind and sand, and at the same time does not affect the gas and heat inside the circuit breaker from being transferred outwards; in addition, the protective space 114 formed by the base 112, the middle cover 113 and the terminal 120 further blocks the wind and sand from entering the circuit breaker. Due to the dual protection of the shielding plate 1 and the protective space 114, the external wind and sand are not easy to enter the circuit breaker, so that the circuit breaker can still have excellent performance in harsh use environments.

[0105] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. An air outlet structure, applied to a circuit breaker, the circuit breaker comprising a housing (110), the housing (110) being provided with a first air outlet (111), characterized in that: The air outlet structure comprises a shielding plate (1), wherein the shielding plate (1) is used to shield the first air outlet (111); The shielding plate (1) has a closed state and an open state, wherein: when the shielding plate (1) is in the closed state, a second air outlet (2) is formed between the shielding plate (1) and the shell (110); when the shielding plate (1) is in the open state, a third air outlet (3) is formed between the shielding plate (1) and the shell (110); The second air outlet (2) and the third air outlet (3) are both connected to the first air outlet (111), and the opening area of ​​the second air outlet (2) is smaller than the opening area of ​​the third air outlet (3).

2. The air outlet structure according to claim 1, characterized in that: The shielding plate (1) has a fixed end and a free end that are arranged opposite to each other, the fixed end of the shielding plate (1) is rotatably connected to the housing (110), and the shielding plate (1) is configured to switch between the closed state and the open state by rotating relative to the housing (110); Alternatively, the shielding plate (1) is slidably mounted on the housing (110), and the shielding plate (1) is configured to switch between the closed state and the open state by linearly moving relative to the housing (110).

3. The air outlet structure according to claim 2, characterized in that: It also comprises a limit strip (4) arranged on the shell (110), the limit strip (4) being provided with an inclined surface (41), the inclined surface (41) being inclined from the fixed end of the shielding plate (1) to the free end of the shielding plate (1) in the direction of rotation and opening of the shielding plate (1); the shielding plate (1) is overlapped on the inclined surface (41).

4. The air outlet structure according to claim 2, characterized in that: It also comprises a latching slot (5) arranged on the housing (110), the latching slot (5) being plug-fitted with the shielding plate (1).

5. The air outlet structure according to claim 4, characterized in that: The shielding plate (1) is T-shaped and comprises a main body (11) and plug-in parts (12) arranged on both sides of the main body (11), and the plug-in parts (12) are plug-fitted with the locking grooves (5).

6. The air outlet structure according to claim 1, characterized in that: It also includes a first outer end surface (6) arranged on the shell (110), and the first air outlet (111) is arranged on the first outer end surface (6); An air outlet groove (61) is provided on the first outer end surface (6); when the shielding plate (1) is in a closed state, the shielding plate (1) contacts the first outer end surface (6) and surrounds the air outlet groove (61) to form the second air outlet (2); and the shielding plate (1) has a certain angle relative to a horizontal plane.

7. The air outlet structure according to claim 1, characterized in that: The shielding plate (1) can be switched from the open state to the closed state under the action of gravity; And / or, it further comprises an elastic member (7), wherein the elastic member (7) is connected between the shielding plate (1) and the shell (110) and is used to drive the shielding plate (1) to switch from the open state to the closed state.

8. The air outlet structure according to claim 1, characterized in that: The shielding plate (1) is provided with a heat dissipation slot (13), or the shielding plate (1) is in a mesh structure.

9. A circuit breaker, characterized in that: It comprises a housing (110) and at least one air outlet structure according to any one of claims 1 to 8.

10. The circuit breaker according to claim 9, characterized in that The housing (110) comprises a base (112) and a middle cover (113) connected to each other, at least two baffles (1131) are arranged on the outer end surface of the middle cover (113), and an air outlet channel is formed between any two adjacent baffles (1131); The circuit breaker further comprises at least one wiring terminal (120), at least one wiring terminal (120) being arranged in a one-to-one correspondence in at least one of the air outlet channels, a corresponding group of the wiring terminals (120) and the air outlet channels being arranged to form a protective space (114), and at least one of the air outlet structures being arranged in a one-to-one correspondence in at least one of the protective spaces (114).

Images