Primary and secondary fusion complete column-mounted circuit breaker with protection structure

Abstract

The invention belongs to the technical field of pole-mounted circuit breakers, and particularly relates to a primary and secondary fusion complete pole-mounted circuit breaker with a protection structure, which comprises a circuit breaker body and a protection shell mounted on the outer side of the circuit breaker body in a covering manner, the air purifier further comprises an internal and external interaction mechanism, and the internal and external interaction mechanism is installed on the protective shell and used for controlling exchange of air inside and outside the protective shell. According to the invention, the internal and external interaction mechanism is arranged, the ventilating fan and the pleated filter part are arranged, and the high-temperature air in the protective shell is replaced by the airflow with low dust content, so that the cooling treatment of the circuit breaker body is realized, and at the same time, by opening the drainage channel and setting the position of the pleated filter part, the cooling effect of the circuit breaker body is improved. The impact strength of wind power on the protective shell is reduced, meanwhile, the wind power is used for cleaning the pleat-shaped filtering piece so as to maintain long-term operation of the internal and external interaction mechanism, and effective control over the temperature of the circuit breaker body is achieved while the circuit breaker body is comprehensively protected.

Description

Technical Field

[0001] This invention belongs to the technical field of pole-mounted circuit breakers, specifically a primary and secondary integrated pole-mounted circuit breaker with a protective structure. Background Technology

[0002] The integrated primary and secondary pole-mounted circuit breaker refers to an outdoor pole-mounted device that deeply integrates the primary high-voltage circuit breaker body with the secondary measurement, control, and protection unit into a modular and compact structure.

[0003] Since pole-mounted circuit breakers (hereinafter referred to as pole-mounted circuit breakers) are usually installed on outdoor poles and exposed to harsh environmental factors such as wind, rain, dust, high temperature, low temperature and ultraviolet radiation, their external components, such as housings, connectors and insulation surfaces, are prone to corrosion, aging, cracking or sealing failure. This can lead to moisture absorption, short circuits or performance degradation of internal electronic components, seriously reducing the protection level, electrical insulation and long-term operational reliability of the equipment. In order to delay the aging of the equipment, protective mechanisms are usually set on the pole-mounted circuit breaker to achieve the purpose of protecting the equipment. For example, a safety pole-mounted circuit breaker with multiple protections is disclosed in the related technology, application number CN202510587271X. In this technology, through components such as air collecting plates and diverter plates, it can not only provide a wrap-around protection for components such as poles, thereby reducing the erosion of components such as poles by external sand, rain and pollutants, thereby improving the overall service life of the pole-mounted circuit breaker, but also guide the air blown to both sides of the isolation housing, thereby reducing the impact of airflow on components such as the isolation housing.

[0004] However, in practical applications, it has been found that, on the one hand, the solid-sealed pole generates a lot of heat when operating under high load, causing the overall temperature of the pole-mounted circuit breaker to rise. Therefore, when providing enclosed protection for the pole-mounted circuit breaker, it is necessary to control the rapid dissipation of heat. Although the solution has ventilation openings on the isolation shell, the heat dissipation speed is slow when relying solely on the heat itself in the absence of an air-driven structure. On the other hand, the airflow at the height of the pole-mounted circuit breaker has a high dust content. Without filtration, the airflow will carry a large amount of dust into the isolation shell.

[0005] In view of this, the present invention proposes a primary and secondary integrated pole-mounted circuit breaker with a protective structure to solve the above-mentioned technical problems. Summary of the Invention

[0006] To overcome the shortcomings of existing technologies and solve the aforementioned technical problems, this invention proposes a primary and secondary integrated pole-mounted circuit breaker with a protective structure.

[0007] The technical solution adopted by the present invention to solve its technical problem is: a primary and secondary integrated pole-mounted circuit breaker with a protective structure, comprising a circuit breaker body and a protective shell installed on the outside of the circuit breaker body. It also includes an internal and external interaction mechanism, which is installed on the protective housing and is used to control the exchange of air inside and outside the protective housing; The internal and external interaction mechanism includes a flow channel, an exhaust fan, and a pleated filter element; The protective housing is provided with a flow channel, which is located between two adjacent solid-sealing poles. The flow channel is used to guide airflow through the middle of the protective housing. Each of the protective housings has a ventilation window, which is located in the middle of the drainage channel. A ventilation fan is installed inside the protective housing. A pleated filter element is installed inside the drainage channel. The pleated filter element covers the ventilation window and is used to filter solid impurities in the air. It also includes a follow-up vibration mechanism, which works in conjunction with the pleated filter element to achieve vibration cleaning of the pleated filter element through airflow changes.

[0008] Furthermore, all the pleated filter elements are elliptical cylindrical structures, with the axis of the pleated filter element perpendicular to the length direction of the drainage channel, and the major semi-axis of the pleated filter element parallel to the length direction of the drainage channel.

[0009] Furthermore, the follow-up vibration mechanism is installed in the drainage channel, and the follow-up vibration mechanism includes a moving plate; The pleated filter element consists of a support spring, a pleated filter media, and a connecting ring. The connecting ring is fixedly installed at both ends of the pleated filter media, and the support spring is installed between the connecting rings to enhance the elasticity of the pleated filter element. One end of the pleated filter element extends and is fixed to the protective housing, while the other end is fixedly installed with a movable plate. The movable plate is suspended in the drainage channel through the pleated filter element.

[0010] Furthermore, the follow-up vibration mechanism also includes a drainage plate; The ventilation window and pleated filter element are symmetrically arranged in a single drainage channel. The movable plate is located between the pleated filter elements. Drainage plates are fixedly installed on both sides of the movable plate. The drainage plates are inclined. The drainage plates cooperate with the movable plate to divide the drainage channel into two conical channels.

[0011] Furthermore, a positioning rod is fixedly installed inside the drainage channel, and a swaying groove is provided on the moving plate. The swaying groove is designed in the same direction as the drainage channel, and in the initial state, the positioning rod extends to the middle of the swaying groove.

[0012] Furthermore, a connecting rod is fixedly installed on the movable plate. In the initial state, the connecting rod extends into the protective shell through the ventilation window. A closing plate is fixedly installed on the end of the connecting rod away from the movable plate. In the initial state, the ventilation window is blocked by the closing plate.

[0013] Furthermore, a control tube is fixedly installed inside the protective housing, and the control tube is conductively connected to the ventilation window. All ventilation fans are installed inside the control tube.

[0014] Furthermore, the control tube is provided with a circulation hole, and an L-shaped baffle is fixedly installed on the closing plate. The baffle corresponds to the circulation hole one by one. In the initial state, the baffle blocks the circulation hole. When the closing plate moves into the ventilation window, the circulation hole gradually opens.

[0015] The beneficial effects of this invention are as follows: 1. The present invention discloses a primary and secondary integrated pole-mounted circuit breaker with a protective structure. By setting an internal and external interaction mechanism and utilizing a ventilation fan and a pleated filter, the high-temperature air inside the protective housing is replaced by airflow with a lower dust content, thereby cooling the circuit breaker body. At the same time, by opening the drainage channel and positioning the pleated filter, the impact of wind on the protective housing is reduced, and the pleated filter is cleaned by the wind. This maintains the long-term operation of the internal and external interaction mechanism, providing comprehensive protection for the circuit breaker body while effectively controlling the temperature of the circuit breaker body.

[0016] 2. The primary and secondary integrated pole-mounted circuit breaker with a protective structure described in this invention, by incorporating a follow-up vibration mechanism and utilizing the structural characteristics of the pleated filter element, causes the pleated filter element to extend and retract vertically under airflow impact, thereby deforming the surface of the pleated filter element and enhancing the cleaning effect of the airflow on its surface impurities. Simultaneously, after the airflow impact is removed, the elasticity of the support spring causes the pleated filter element to oscillate up and down, further increasing the probability of dust and impurities detaching from the pleated filter element through vibration, ultimately maintaining the long-term normal operation of the internal and external interactive mechanism. Attached Figure Description

[0017] The invention will now be further described with reference to the accompanying drawings.

[0018] Figure 1 This is a perspective view of the present invention; Figure 2 This is an assembled perspective view of the circuit breaker body and the protective housing of the present invention; Figure 3 This is a perspective view of the protective casing in this invention; Figure 4This is a three-dimensional view of part of the internal and external interaction mechanism within the protective shell; Figure 5 This is a schematic diagram of the installation of the follow-up vibration mechanism in the protective housing in this invention; Figure 6 It is a 3D view of the assembly of the movable plate and the two upper and lower pleated filter elements; Figure 7 This is a perspective view of the pleated filter element in this invention; Figure 8 This is a perspective view of the assembly of the control tube, the closing plate, and the baffle in this invention; In the diagram: 1. Circuit breaker body; 2. Protective housing; 3. Drainage channel; 4. Ventilation window; 5. Ventilation fan; 6. Moving plate; 7. Support spring; 8. Pleated filter media; 9. Connecting ring; 10. Drainage plate; 11. Positioning rod; 12. Shaking groove; 13. Connecting rod; 14. Closing plate; 15. Control tube; 16. Circulation hole; 17. Baffle; 18. Mounting bracket. Detailed Implementation

[0019] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0020] like Figures 1 to 8 As shown, the present invention provides a primary and secondary integrated pole-mounted circuit breaker with a protective structure, comprising a circuit breaker body 1 and a protective shell 2 enclosed and installed on the outside of the circuit breaker body 1. In the present invention, the protective shell 2 and the circuit breaker body 1 are mounted on the pole by a mounting bracket 18. The circuit breaker body 1 includes at least a base and a solid-sealed pole. It also includes an internal and external interaction mechanism, which is installed on the protective housing 2 and is used to control the exchange of air inside and outside the protective housing 2; The internal and external interaction mechanism includes a flow channel 3, an air exchange fan 5, and a pleated filter element; The protective housing 2 is provided with a flow channel 3, which is located between two adjacent solid sealing poles 20. The flow channel 3 is used to guide airflow through the middle of the protective housing 2. Each of the protective housings 2 is provided with a ventilation window 4, which is located in the middle of the drainage channel 3. A ventilation fan 5 is installed inside the protective housing 2. A pleated filter element is installed inside the flow channel 3. The pleated filter element covers the ventilation window 4 and is used to filter solid impurities in the air. All the pleated filter elements are elliptical cylindrical structures. The axis of the pleated filter element is perpendicular to the length direction of the flow channel 3, and the major semi-axis of the pleated filter element is parallel to the length direction of the flow channel 3. The elliptical structure has the advantage of a large central diameter, which gradually reduces the gap diameter between the pleated filter element and the flow channel 3, thereby increasing the airflow velocity and enhancing the dust trapping effect. On the other hand, its arc-shaped surface can also enhance the airflow guidance effect.

[0021] When protecting a pole-mounted circuit breaker that integrates primary and secondary components, the enclosure-type protective structure can completely shield the pole-mounted circuit breaker, effectively preventing environmental factors such as rain and ultraviolet rays from corroding and aging the components. However, this also leads to problems such as poor heat dissipation and dust accumulation in the heat dissipation channels. To address this, the present invention sets up an internal and external interaction mechanism to force the airflow between the inside and outside of the protective housing 2. Combined with a pleated filter and a drainage channel 3, the airflow is filtered and the pleated filter is dusted, thereby achieving long-term control of the internal temperature of the protective housing 2.

[0022] Specifically, during the use of pole-mounted circuit breakers, due to the favorable wind resources and high dust levels at their location, the temperature inside the protective housing 2 rises as heat is continuously dissipated during normal operation. In this invention, a temperature sensor is installed inside the protective housing 2 and connected to the ventilation fan 5 via a pre-set program. When the temperature inside the protective housing 2 reaches a pre-set threshold, the ventilation fan 5 starts. As the ventilation fan 5 rotates, it guides airflow from the ventilation window 4 towards the circuit breaker body 1. Through heat exchange with the air, the temperature of the circuit breaker body 1 decreases. Meanwhile, the outside air needs to pass through a pleated filter element as it enters the ventilation window 4. In this invention, the pleated filter element is a filter element with a regularly pleated filter surface. When the air passes through the pleated filter element, sand, gravel, and other impurities are removed. The air is intercepted and filtered, while residual sand and gravel accumulate on the drainage channel 3 or the pleated filter element. When the surrounding environment is windy, the airflow is blocked by the protective housing 2 when passing the pole-mounted circuit breaker, causing some airflow to enter the drainage channel 3 and flow along the drainage channel 3, thereby impacting the pleated filter element located in the drainage channel 3. The impact of the airflow will cause the pleated filter element to vibrate, thereby causing dust and impurities on the pleated filter element to fall off. On the other hand, the impact of the airflow will cause the dust and impurities accumulated in the drainage channel 3 to be discharged, thereby maintaining the continuous filtration performance of the pleated filter element and reducing the maintenance difficulty of the internal and external interaction mechanism. At the same time, due to the opening of the drainage channel 3, the windward area of ​​the protective housing 2 is reduced, thereby reducing the impact force of the wind on the drainage housing.

[0023] This invention, by setting up an internal and external interaction mechanism and utilizing the ventilation fan 5 and the pleated filter, replaces the high-temperature air inside the protective housing 2 with airflow containing less dust, thereby cooling the circuit breaker body 1. At the same time, by opening the drainage channel 3 and positioning the pleated filter, the impact of wind on the protective housing 2 is reduced, and the wind is used to clean the pleated filter, thus maintaining the long-term operation of the internal and external interaction mechanism. While providing comprehensive protection for the circuit breaker body 1, the temperature of the circuit breaker body 1 is effectively controlled.

[0024] As a preferred embodiment of the present invention, it further includes a follow-up vibration mechanism, which cooperates with the pleated filter element to achieve vibration cleaning of the pleated filter element through airflow changes.

[0025] The follow-up vibration mechanism is installed in the drainage channel 3, and the follow-up vibration mechanism includes a moving plate 6; The pleated filter element consists of a support spring 7, a pleated filter material 8, and a connecting ring 9. The connecting ring 9 is fixedly installed at both ends of the pleated filter material 8, and the support spring 7 is installed between the connecting rings 9 to enhance the elastic performance of the pleated filter element. One end of the pleated filter element extends and is fixed to the protective housing 2, and the other end is fixedly installed with a movable plate 6. The movable plate 6 is suspended in the drainage channel 3 through the pleated filter element.

[0026] The follow-up vibration mechanism also includes a drainage plate 10. The ventilation window 4 and the pleated filter element are symmetrically arranged in a single drainage channel 3. The moving plate 6 is located between the pleated filter elements. Drainage plates 10 are fixedly installed on both sides of the moving plate 6. The drainage plates 10 are all made of elastic metal sheets. The drainage plates 10 are all inclined. The drainage plates 10 cooperate with the moving plate 6 to divide the drainage channel 3 into two conical channels.

[0027] To enhance the cleaning effect of the pleated filter element and maintain the normal operation of the internal and external interaction mechanism, in this invention, the pleated filter element consists of a supporting spring 7, a pleated filter material 8, and a connecting ring 9. The pleated filter material 8 is used to increase its filtration area. The supporting spring 7 provides the pleated filter element with a certain degree of elastic expansion and contraction. The presence of the guide plate 10 and the moving plate 6 guides the airflow. In practical applications, the combination of the guide plate 10 and the moving plate 6 is suspended in the middle of the guide channel 3, dividing the guide channel 3 into upper and lower channels. The opening sizes of the two channels on the same side differ significantly. Therefore, when airflow impacts from one side, the airflow entering the guide channel 3 will push the guide plate. The assembly of 10 and the movable plate 6 rises or falls. The movable plate 6 is located between the two pleated filter elements. Therefore, the rise and fall of the movable plate 6 will directly cause the two pleated filter elements to extend and retract. The extension and retraction movement will cause the pleats on the surface of the pleated filter elements to deepen or unfold. The pleated filter element on the airflow side is in an extended state, and its surface pleats gradually unfold, making it easier for the solid impurities intercepted by the pleats to be carried away and detached by the airflow. During the process of airflow interruption or airflow intensity change, under the elastic action of the support spring 7, the movable plate 6 will sway up and down, which will cause the pleated filter elements to vibrate, further increasing the probability of solid impurities intercepted on the pleated filter elements falling off.

[0028] This invention, by setting up a follow-up vibration mechanism, combined with the structural characteristics of the pleated filter element, causes the pleated filter element to move up and down under the impact of airflow, thereby deforming the surface of the pleated filter element and enhancing the cleaning effect of airflow on its surface impurities. At the same time, after the impact of airflow is lost, the elasticity of the support spring 7 is used to realize the up and down reciprocating swaying of the pleated filter element, thereby increasing the probability of dust and impurities leaving the pleated filter element through vibration, and ultimately maintaining the long-term normal operation of the internal and external interaction mechanism.

[0029] In a preferred embodiment of the present invention, a positioning rod 11 is fixedly installed in the drainage channel 3, and a swaying groove 12 is provided on the moving plate 6. The swaying groove 12 is designed in the same direction as the drainage channel 3. In the initial state, the positioning rod 11 extends to the middle of the swaying groove 12.

[0030] To further enhance the vibration of the pleated filter element, a positioning rod 11 is installed in the flow channel 3, and a swaying groove 12 is provided on the moving plate 6. The length direction of the swaying groove 12 is the same as the length direction of the flow channel 3. Therefore, when the airflow impacts the pleated filter element, it will cause the pleated filter element and the moving plate 6 to tilt in the direction of airflow. At this time, the position of the swaying groove 12 changes, and the moving plate 6 eventually hits the positioning rod 11. When the airflow stops, the pleated filter element returns to its original shape under the action of its own elasticity, and hits the positioning rod 11 again when the airflow impacts again. In windy weather, the vibration effect generated by the impact can effectively increase the probability of dust and impurities falling off the pleated filter element.

[0031] In a preferred embodiment of the present invention, a connecting rod 13 is fixedly installed on the movable plate 6. The connecting rod 13 is made of a spring telescopic rod. In the initial state, the connecting rod 13 extends into the protective housing 2 through the ventilation window 4. A closing plate 14 is fixedly installed at the end of the connecting rod 13 away from the movable plate 6. In the initial state, the ventilation window 4 is blocked by the closing plate 14. The diameter of the end of the ventilation window 4 that is connected to the pleated filter is smaller than the diameter of the closing plate 14.

[0032] In practical applications, to avoid the impact of airflow extraction on the wind-driven scouring of the pleated filter element, in the initial state of this invention, the moving plate 6 is suspended in the middle of the drainage channel 3, supported by the upper and lower pleated filter elements. At this time, both closing plates 14 are in contact with the ventilation window 4, blocking the ventilation window 4. When the airflow impacts the drainage channel 3, the moving plate 6 rises or falls under the push of the airflow. Through the push of the connecting rod 13, the two closing plates 14 rise or fall. The closing plate 14 on the airflow side continues to penetrate into the ventilation window 4, achieving the sealing of the ventilation window 4. The closing plate 14 on the other side disengages from the ventilation window 4, making the ventilation window 4 connected to the protective shell 2. Therefore, the pleated filter element on the wind-driven impact side is not affected by the airflow extraction effect of the ventilation fan 5, thereby reducing the impact of airflow extraction on wind scouring.

[0033] In a preferred embodiment of the present invention, a control tube 15 is fixedly installed inside the protective housing 2. The control tube 15 is electrically connected to the ventilation window 4. All ventilation fans 5 are installed inside the control tube 15. A circulation hole 16 is opened on the control tube 15. An L-shaped baffle 17 is fixedly installed on the closing plate 14. The baffle 17 corresponds one-to-one with the circulation hole 16. In the initial state, the baffle 17 blocks the circulation hole 16. When the closing plate 14 moves into the ventilation window 4, the circulation hole 16 gradually opens.

[0034] When the wind pushes the movable plate 6 to move, causing one ventilation window 4 to close and the other to open, the movement of the closing plate 14 also drives the baffle 17 to move synchronously. When the closing plate 14 moves into the ventilation window 4, the circulation hole 16 is opened; when the closing plate 14 moves away from the ventilation window 4, the circulation hole 16 is continuously blocked. That is to say, after the movable plate 6 and the diversion plate 10 divide the diversion channel 3 into two channels, the ventilation window 4 on the side facing the wind is closed, and the circulation hole 16 on that side is open. Therefore, when the ventilation fan 5 on that side moves... Air is controlled to flow from the circulation hole 16 to the opening of the control pipe 15, thereby pushing the air inside the protective shell 2. The airflow enhances the heat diffusion effect inside the protective shell 2. The ventilation window 4 on the side not blown by the wind is in the open state, and the circulation hole 16 on this side is blocked by the baffle 17. When the ventilation fan 5 is working, the airflow is controlled to flow from the ventilation window 4 to the opening of the control pipe 15, so that one set of ventilation fans 5 exchanges with the outside air in the leeward position, and the other set is used to push the airflow inside the protective shell 2, ultimately enhancing the heat dissipation effect.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A primary and secondary fused integrated pole-mounted circuit breaker with a protective structure, comprising a circuit breaker body (1) and a protective shell (2) installed on the outside of the circuit breaker body (1) in a cage manner; characterized in that Further comprising an inside-outside interaction mechanism installed on the protective shell (2), the inside-outside interaction mechanism being used to control the exchange of air inside and outside the protective shell (2); The inside-outside interaction mechanism comprises a flow guide channel (3), an air exchange fan (5) and a pleated filter element; The protective shell (2) is provided with the flow guide channel (3) located between two adjacent solid-sealed pole columns, the flow guide channel (3) being used to guide the airflow to pass through the middle part of the protective shell (2); The protective shell (2) is provided with air exchange windows (4) located in the middle part of the flow guide channel (3), and the protective shell (2) is installed with the air exchange fan (5); The flow guide channel (3) is installed with the pleated filter element, the pleated filter element being installed in the flow guide channel (3), the pleated filter element being used to shield the air exchange window (4), and the pleated filter element being used to filter the solid impurities in the air; Further comprising a follow-up vibration mechanism cooperating with the pleated filter element, the follow-up vibration mechanism being used to realize the vibration cleaning of the pleated filter element through the airflow change.

2. The primary and secondary fused complete pole mounted circuit breaker with protection structure according to claim 1, characterized in that: The pleated filter element is an elliptical cylindrical structure, the axis of the pleated filter element being perpendicular to the length direction of the flow guide channel (3), and the major semi-axis of the pleated filter element being parallel to the length direction of the flow guide channel (3).

3. The primary and secondary fused package circuit breaker with protection structure according to claim 1 or 2, characterized in that: The follow-up vibration mechanism is installed in the flow guide channel (3), and the follow-up vibration mechanism comprises a moving plate (6); The pleated filter element is composed of a supporting spring (7), a pleated filter material (8) and a connecting ring (9), the connecting ring (9) being fixedly installed at both ends of the pleated filter material (8), and the supporting spring (7) being installed between the connecting rings (9) and being used to enhance the elastic property of the pleated filter element; One end of the pleated filter element is extended and fixed on the protective shell (2), and the other end is fixedly installed with the moving plate (6), the moving plate (6) being hung in the flow guide channel (3) through the pleated filter element.

4. The primary and secondary fused package circuit breaker with protection structure according to claim 3, characterized in that: The follow-up vibration mechanism further comprises a flow guide plate (10); The air exchange window (4) and the pleated filter element in the single flow guide channel (3) are symmetrically arranged, the moving plate (6) is located between the pleated filter elements, the flow guide plates (10) are fixedly installed on both sides of the moving plate (6), the flow guide plates (10) are inclinedly arranged, and the flow guide plates (10) cooperate with the moving plate (6) to divide the flow guide channel (3) into two conical channels.

5. The primary and secondary fused package circuit breaker with protection structure according to claim 4, characterized in that: The flow guide channel (3) is fixedly installed with a positioning rod (11), the moving plate (6) is provided with a shaking groove (12), the shaking groove (12) is designed in the same direction as the flow guide channel (3), and the positioning rod (11) is extended to the middle part of the shaking groove (12) in the initial state.

6. The primary and secondary fused package circuit breaker with protection structure according to claim 5, characterized in that: The connecting rod (13) is fixedly installed on the moving plate (6), and in the initial state, the connecting rod (13) extends to the inside of the protective shell (2) through the air exchange window (4).

7. The primary and secondary fused package circuit breaker with protection structure according to claim 6, characterized in that: A control pipe (15) is fixedly installed in the inside of the protective shell (2), the control pipe (15) is in conductive connection with the air exchange window (4), and the air exchange fan (5) is installed in the control pipe (15).

8. The two-stage integrated pole-mounted circuit breaker with protection structure according to claim 7, characterized in that: A circulating hole (16) is formed in the control pipe (15), an L-shaped baffle (17) is fixedly installed on the closing plate (14), the baffle (17) corresponds to the circulating hole (16) in a one-to-one manner, the baffle (17) shields the circulating hole (16) in the initial state, and when the closing plate (14) moves towards the inside of the air exchange window (4), the circulating hole (16) is gradually opened.

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