Gas blocking structure of circuit breaker

Abstract

The utility model provides a gas blocking structure of a circuit breaker, the circuit breaker comprises a circuit breaker housing, an arc extinguish chamber arranged in the circuit breaker housing, a contact mechanism and a control module, the control module comprises a controller housing and a circuit board assembly arranged in the controller housing, a cover plate is also arranged above the circuit breaker housing, and the circuit board assembly is arranged on the circuit breaker housing. A plug-in structure used for preventing gas from entering the controller housing is formed between the cover plate and the controller housing, and the gas blocking structure can overcome the defect that in the prior art, when a contact mechanism is broken, generated metal particles splash on a circuit board under the action of strong airflow, and consequently the circuit board is short-circuited.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, and particularly relates to a gas-blocking structure of a circuit breaker. Background Art

[0002] The control unit of a circuit breaker is an important part of the power system, and its function is to ensure the safe and stable operation of the power system, and improve the automation level and operation efficiency of the system.

[0003] All components including the control unit of a traditional electronic circuit breaker are sealed in a plastic shell. When encountering a large breaking current, gas and metal particles will be generated by the metal material under the arc energy. When the contact mechanism breaks, the generated metal particles will splash onto the circuit board under the action of a strong air flow, resulting in a short circuit of the circuit board. Summary of the Utility Model

[0004] Therefore, the technical problem to be solved by the utility model is to overcome the defect that when the contact mechanism breaks in the prior art, the generated metal particles splash onto the circuit board under the action of a strong air flow, resulting in a short circuit of the circuit board, so as to provide a gas-blocking structure of a circuit breaker with good gas-blocking effect.

[0005] To this end, the utility model provides a gas-blocking structure of a circuit breaker. The circuit breaker includes a circuit breaker housing, an arc extinguishing chamber, a contact mechanism and a control module arranged inside the circuit breaker housing. The control module includes a controller housing and a circuit board assembly arranged inside the controller housing. A cover plate is further arranged above the circuit breaker housing, and an insertion structure for preventing gas from entering the inside of the controller housing is formed between the cover plate and the controller housing.

[0006] Further: The cover plate includes a middle cover, and extension ribs surrounding the periphery of the top of the controller housing are arranged on the middle cover. The extension ribs surround and form a receiving cavity for the top position of the controller housing to be embedded. The insertion structure is formed by the insertion of the extension ribs and the side wall of the controller housing.

[0007] Further: The circuit board assembly includes a circuit board and a control push button arranged above the circuit board, and a sealing cover is arranged above the control push button.

[0008] Further: The cover plate further includes an upper cover, and the upper cover is covered on the upper end of the middle cover. An exhaust cavity for discharging the gas generated after the contact mechanism breaks is arranged at the joint of the upper cover and the middle cover. At least one baffle for blocking the gas in the exhaust cavity from entering the control push button is arranged between the control push button and the exhaust cavity.

[0009] Further: The baffle is arranged at the middle cover, there are two baffles and they are arranged in parallel, and blocking ribs for inserting with the baffle are arranged at the bottom of the upper cover.

[0010] Further: A plurality of stoppers for abutting against the outer wall of the controller housing are also arranged in the accommodation cavity. Further: An induction module is arranged below the controller housing. One side of the controller housing close to the induction module has an extension plate, the extension plate wraps around the outside of the induction module, and the middle cover has a gas blocking rib arranged on the side of the extension plate.

[0011] The technical solution of the present utility model has the following advantages:

[0012] 1. For the gas blocking structure of a circuit breaker provided by the present utility model, generally, a part of the strong airflow generated after the contact mechanism is disconnected will be discharged through the conventionally arranged exhaust passage. However, due to the small size of the exhaust passage, when the airflow is generated, it cannot be quickly and completely discharged in a short time. The airflow that has not been discharged will reach the circuit board assembly through the gap. Compared with the prior art, an insertion structure is arranged between the controller housing and the cover plate, and a barrier for blocking the airflow is formed through the insertion structure. The circuit board assembly is composed of multiple circuit boards, and the circuit boards are arranged inside the controller housing. Therefore, when a barrier for blocking the airflow is formed outside the controller housing, the airflow cannot enter the circuit board, thereby effectively preventing metal particles from entering the circuit board assembly and causing a short circuit.

[0013] 2. For the gas blocking structure of a circuit breaker provided by the present utility model, after the controller housing is installed into the base of the circuit breaker, the middle cover is covered on the upper part of the controller housing. A circle of extension ribs capable of wrapping the controller housing is arranged on the middle cover. The extension ribs enclose to form an accommodation cavity, and the accommodation cavity surrounds the outside of the controller housing. And the controller housing and the extension ribs are inserted to form a circle of gas blocking barrier, so that the airflow can only stay outside the controller housing and cannot enter the controller housing. Description of the Drawings

[0014] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required to be used in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0015] Figure 1 Structural schematic diagram of the circuit breaker after removing the cover plate;

[0016] Figure 2 Sectional structural schematic diagram of the circuit breaker;

[0017] Figure 3 Structural schematic diagram of the position of the control module in the circuit breaker;

[0018] Figure 4 It is a schematic structural diagram of the middle cover;

[0019] Figure 5 It is a schematic structural diagram of the upper cover;

[0020] Figure 6 It is a schematic cross-sectional structure diagram of the upper cover and the middle cover;

[0021] Figure 7 It is Figure 6 an enlarged view of part A in;

[0022] Figure 8 It is a schematic installation structure diagram between the controller housing and the induction housing.

[0023] Explanation of reference numerals:

[0024] 1. Circuit breaker housing; 11. Arc extinguishing chamber; 12. Contact mechanism; 2. Control module; 21. Controller housing; 22. Circuit board assembly; 23. Control push button; 24. Sealing cover; 3. Cover plate; 31. Middle cover; 32. Extension rib; 33. Accommodation cavity; 34. Upper cover; 4. Induction module; 41. Extension plate; 5. Air baffle rib; 6. Exhaust cavity; 7. Baffle; 71. Baffle rib; 8. Stopper. Specific implementation mode

[0025] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0026] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is 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 of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" 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 a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0028] In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0029] Embodiment

[0030] This embodiment provides a gas-blocking structure for a circuit breaker. The circuit breaker includes a circuit breaker housing 1, an arc extinguishing chamber 11, a contact mechanism 12, and a control module 2 disposed inside the circuit breaker housing 1. The control module 2 includes a controller housing 21 and a circuit board assembly 22 disposed inside the controller housing 21. A cover plate 3 is further disposed above the circuit breaker housing 1, and an insertion structure for preventing gas from entering the inside of the controller housing 21 is formed between the cover plate 3 and the controller housing 21.

[0031] The above specific improvement is as follows: As Figures 1 - 3 shown, a part of the strong air flow generated after the contact mechanism 12 is usually interrupted will be discharged from the conventionally provided exhaust passage. However, due to the small size of the exhaust passage, when the air flow is generated, it cannot be quickly and completely discharged in a short time, and the air flow that has not been discharged will reach the circuit board assembly 22 through the gap. Compared with the prior art, in this embodiment, an insertion structure is provided between the controller housing 21 and the cover plate 3, and a barrier for blocking the air flow is formed through the insertion structure. The circuit board assembly 22 is composed of multiple circuit boards, and the circuit boards are disposed inside the controller housing 21. Therefore, when a barrier for blocking the air flow is formed outside the controller housing 21, the air flow cannot enter the circuit board, thereby effectively preventing metal particles from entering the circuit board assembly 22 and causing a short circuit.

[0032] Based on the above embodiment: The cover plate 3 includes a middle cover 31, and extension ribs 32 surrounding the periphery of the top of the controller housing 21 are provided on the middle cover 31. The extension ribs 32 surround and form a receiving cavity 33 for the top of the controller housing 21 to be inserted into, and the insertion structure is formed by the insertion of the extension ribs 32 and the side wall of the controller housing 21.

[0033] The above specific improvement is as follows: As Figure 4As shown, after the controller housing 21 is installed into the base of the circuit breaker, the middle cover 31 is covered above the controller housing 21. A circle of extension ribs 32 that can wrap the controller housing 21 is provided on the middle cover 31. The extension ribs 32 enclose to form a receiving cavity 33. The receiving cavity 33 is disposed around the outside of the controller housing 21, and the controller housing 21 and the extension ribs 32 are inserted into each other to form a gas-blocking barrier, so that the air flow can only stay outside the controller housing 21 and cannot enter the controller housing 21.

[0034] Based on the above embodiment: The circuit board assembly 22 includes a circuit board and a control push button 23 provided above the circuit board, and a cover 24 is provided above the control push button 23.

[0035] The above specific improvement is: As Figure 3 , Figure 6 and Figure 7 shown, the circuit board assembly 22 includes a control push button 23 for adjusting parameters. A cover 24 is provided above the control push button 23. Through the setting of the cover 24, the control push button 23 can be wrapped and a dust-proof effect is formed.

[0036] Based on the above embodiment: The cover plate 3 further includes an upper cover 34. The upper cover 34 is covered on the upper end of the middle cover 31. An exhaust cavity 6 for discharging the gas generated after the contact mechanism 12 is disconnected is provided between the upper cover 34 and the middle cover 31. At least one baffle 7 for blocking the gas in the exhaust cavity 6 from entering the control push button 23 is provided between the control push button 23 and the exhaust cavity 6.

[0037] The above specific improvement is: As Figures 6 - 8 shown, the control push button 23 is provided above the circuit board and is covered with the cover plate 3. When the contact mechanism 12 is disconnected, the strong air flow generated will enter the control push button 23 through the gap in the circuit breaker, thus blowing off the cover plate 3. To prevent this phenomenon, a baffle 7 is provided on the middle cover 31 for abutting against the side wall of the upper cover 34 to form an insertion structure. The baffle 7 is provided on the middle cover 31 and is located between the gap of the circuit breaker and the control push button 23. When the air flow is generated, it will disperse to the gap of the circuit breaker, and the baffle 7 will form a barrier outside the control push button 23 to prevent the air flow from entering the control push button 23.

[0038] Based on the above embodiment: The baffle 7 is provided at the middle cover 31. Two baffles 7 are provided and are arranged in parallel. A blocking rib 71 that is inserted into the baffle 7 is provided at the bottom of the upper cover 34.

[0039] The above specific improvement is: As Figure 1 , Figure 5As shown, the number of the baffle 71 and the baffle 7 is the same, and multiple baffles 7 can be provided. As a preferred embodiment, the baffle 71 and the baffle 7 are provided as two, the two baffles 7 are provided at the middle cover 31, and the baffle 71 is provided on the upper cover 34. The baffle 71 and the baffle 7 form a pair to block the airflow from reaching the control press key 23, and the baffle 7 and the baffle 7 are provided as two, so as to achieve a double blocking effect and improve the air tightness of the structure.

[0040] On the basis of the above embodiment: a plurality of stoppers 8 for abutting against the outer wall of the controller cover 21 are further provided in the accommodating cavity 33 .

[0041] The above specific improvements are: Figure 4 As mentioned above, a plurality of stoppers 8 are provided in the accommodating cavity 33 . When the middle cover 31 is closed, the stoppers 8 press the controller cover 21 and are interference fit with the controller cover 21 , thereby preventing the controller cover 21 from moving.

[0042] Based on the above embodiment: a sensing module 4 is arranged under the controller cover 21, and the sensing module 4 includes a sensing shell, and an air-blocking rib 5 is arranged on the side of the sensing shell opposite to the controller cover 21, and an extension plate 41 is provided on the side of the controller cover 21 close to the sensing module 4, and the extension plate 41 is wrapped around the outside of the air-blocking rib 5.

[0043] The above-mentioned specific improvements are as follows: there is an extended area on the sensing shell, which accommodates the adapter plate. The extended area is composed of extension ribs 32. In order to prevent the strong airflow generated by the disconnection of the contact mechanism 12 from entering the adapter plate, the extension plate 41 is wrapped around the outside of the air-blocking rib 5 to block the airflow from entering the adapter plate.

[0044] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A gas-blocking structure of a circuit breaker, characterized in that: The circuit breaker includes a circuit breaker housing (1), an arc extinguishing chamber (11), a contact mechanism (12) and a control module (2) disposed inside the circuit breaker housing (1). The control module (2) includes a controller housing (21) and a circuit board assembly (22) disposed inside the controller housing (21). A cover plate (3) is further disposed above the circuit breaker housing (1). A plug-in structure for preventing gas from entering the inside of the controller housing (21) is formed between the cover plate (3) and the controller housing (21).

2. The gas-blocking structure of a circuit breaker according to claim 1, wherein: The cover plate (3) includes a middle cover (31). Extension ribs (32) surrounding the periphery of the top of the controller housing (21) are provided on the middle cover (31). An accommodation cavity (33) for the top of the controller housing (21) to be embedded is formed by surrounding the extension ribs (32). The plug-in structure is formed by the insertion of the extension ribs (32) and the side wall of the controller housing (21).

3. The gas blocking structure of a circuit breaker according to claim 2, characterized in that: The circuit board assembly (22) includes a circuit board and a control push button (23) disposed above the circuit board. A sealing cover (24) is disposed above the control push button (23).

4. The gas-blocking structure of a circuit breaker according to claim 3, wherein: The cover plate (3) further includes an upper cover (34). The upper cover (34) is disposed on the upper end of the middle cover (31). An exhaust cavity (6) for discharging the gas generated after the contact mechanism (12) is disconnected is provided between the upper cover (34) and the middle cover (31). At least one baffle (7) for blocking the gas in the exhaust cavity (6) from entering the control push button (23) is disposed between the control push button (23) and the exhaust cavity (6).

5. The gas blocking structure of a circuit breaker according to claim 4, characterized in that: The baffle (7) is disposed at the middle cover (31). Two baffles (7) are provided and are parallel to each other. A blocking rib (71) inserted with the baffle (7) is disposed at the bottom of the upper cover (34).

6. The gas blocking structure of a circuit breaker according to claim 5, characterized in that: A number of stoppers (8) for abutting against the outer wall of the controller housing (21) are further disposed in the accommodation cavity (33).

7. The air blocking structure of a circuit breaker according to claim 2 or 3, characterized in that: An induction module (4) is disposed below the controller housing (21). One side of the controller housing (21) close to the induction module (4) has an extension plate (41). The extension plate (41) wraps around the outside of the induction module (4). A gas blocking rib (5) disposed on the side of the extension plate (41) is provided on the middle cover (31).

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