An automatic pressure relief load switch

Abstract

The utility model discloses an automatic pressure relief's load switch, including load switch body, be provided with pressure relief piece on load switch body, the outside of pressure relief piece is provided with the protection box, be provided with a plurality of pressure relief holes on the protection box, and the outside of pressure relief piece is provided with the bellows between the protection box and load switch body. The load switch provided by the utility model can efficiently relieve pressure and avoid external risks when the internal high pressure. When the internal high pressure breaks the pressure relief piece, the large fragments generated will be blocked by the protection box to avoid high-speed direct radiation. After the small fragments enter the protection box along with the airflow, they are dispersed at low speed from the pressure relief hole through buffering and deceleration, multidirectional flow guide, and no obvious harm. At the same time, the bellows and the smooth round pipe ensure smooth airflow, and the spring and the guide column buffer impact and stabilize the structure. The whole design not only realizes rapid pressure relief and explosion-proof equipment, but also reduces the risk of fragment ejection and component damage through multiple protection, balances the pressure relief efficiency and operation safety, and meets the long-term stable working requirements of the load switch.

Description

Technical Field

[0001] This utility model relates to an automatic pressure relief load switch. Background Technology

[0002] A load switch is a switching device with short-circuit making and load-carrying capabilities, but typically lacks the ability to interrupt short-circuit current. It is widely used in power distribution networks to isolate power sources and switch load currents. Its operational reliability directly affects the stability and safety of the power system.

[0003] During power system operation, short-circuit faults may occur inside switchgear due to insulation aging, foreign object intrusion, or operational overvoltage. The enormous energy generated by the short-circuit current will instantly form high-temperature, high-pressure gas inside the sealed switchgear, causing a rapid increase in internal pressure. If the pressure is not released in time, it can easily cause a violent explosion of the cabinet, which will not only severely damage the equipment itself but may also endanger the lives of personnel on site and cause huge power outage losses.

[0004] The most common solution currently is to install a pressure relief device, also known as a pressure relief port or explosion-proof port, on the switchgear housing or load switch body. This device typically uses a pressure relief plate as its core component. During operation, the pressure relief plate itself may tear or break, accompanied by high-speed airflow splashing outwards, posing a safety hazard. Utility Model Content

[0005] The main objective of this invention is to provide an automatic pressure relief load switch to solve the problems mentioned in the background section.

[0006] The objective of this utility model can be achieved by adopting the following technical solution: An automatic pressure relief load switch includes a load switch body, a pressure relief plate on the load switch body, a protective box on the outside of the pressure relief plate, a plurality of pressure relief holes on the protective box, and a bellows on the outside of the pressure relief plate between the protective box and the load switch body.

[0007] Preferably, the protective box has a spherical structure.

[0008] Preferably, a smooth circular tube is provided inside the corrugated pipe, the bottom of which is fixedly connected to the corrugated pipe, and the top of which is not fixedly connected to the corrugated pipe.

[0009] Preferably, an annular movable plate is connected to the outside of the protective box, and a spring is provided on the bottom surface of the annular movable plate. The two ends of the spring are respectively fixed to the bottom surface of the annular movable plate and the outer wall of the load switch body.

[0010] Preferably, four springs are provided, and the four springs are evenly distributed on the outside of the protective box and along its circumference.

[0011] Preferably, the outer wall of the protective box is fixedly connected to the inner wall of the annular movable plate by a connecting rod.

[0012] Preferably, the load switch body has a guide post inside the spring, and the annular movable plate has a through hole through which the guide post passes.

[0013] Preferably, the top of the guide post extends outward from the outer side of the annular movable plate and is threaded with a nut.

[0014] Preferably, a first fixing plate is provided on the outside of the pressure relief plate on the load switch body, and a second fixing plate is provided on the bottom surface of the bellows.

[0015] The beneficial technical effects of this utility model are as follows: The load switch provided by this utility model can efficiently relieve internal high pressure and avoid external risks. When the internal high pressure breaks through the pressure relief plate, the resulting large fragments are blocked by the protective box to prevent high-speed direct impact. Small fragments enter the protective box with the airflow, are buffered and decelerated, and dispersed at low speed through multiple guides, posing no obvious harm. At the same time, the corrugated pipe and smooth circular pipe ensure smooth airflow, while the spring and guide post buffer the impact and stabilize the structure. The entire design achieves rapid pressure relief to prevent equipment explosion, while reducing the risk of fragment ejection and component damage through multiple protections, balancing pressure relief efficiency and operational safety, and meeting the long-term stable operation requirements of the load switch. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the load switch structure according to an embodiment of the present invention; Figure 2 This is a top view of a load switch according to an embodiment of the present invention; Figure 3 This is a cross-sectional view of a load switch according to an embodiment of the present invention; Figure 4 This is an embodiment of the present utility model. Figure 3 Enlarged view of point A; Figure 5 This is a schematic diagram of the structure of a load switch (without a protective box) according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the protective box structure according to an embodiment of the present utility model; Figure 7 This is a schematic diagram of the annular movable plate structure of an embodiment of the present invention.

[0017] In the diagram: 1. Load switch body; 2. Pressure relief plate; 3. Protective box; 4. Pressure relief hole; 5. Bellows; 6. Smooth round tube; 7. Annular movable plate; 8. Spring; 9. Connecting rod; 10. Guide post; 11. Through hole; 12. Nut; 13. First fixing plate; 14. Second fixing plate. Detailed Implementation

[0018] To enable those skilled in the art to understand the technical solution of this utility model more clearly, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings, but the implementation of this utility model is not limited thereto.

[0019] like Figures 1-7 As shown, the automatic pressure relief load switch provided in this embodiment includes a load switch body 1, a pressure relief plate 2 is provided on the load switch body 1, a protective box 3 is provided on the outside of the pressure relief plate 2, a plurality of pressure relief holes 4 are provided on the protective box 3, and a bellows 5 is provided between the protective box 3 and the load switch body 1 on the outside of the pressure relief plate 2.

[0020] When a fault occurs inside the load switch body 1, such as an electric arc or insulation breakdown, generating high voltage, the pressure relief plate 2 will rupture under a preset pressure, potentially producing fragments of varying sizes. Large fragments will be blocked by the protective box 3, preventing them from being ejected directly into the external environment in a straight-line impact. Small fragments will enter the protective box 3 with the airflow, be buffered and slowed down by the internal space, change direction, and then dispersed and discharged from multiple pressure relief holes 4. Due to their low speed and small mass, they will not cause physical damage.

[0021] In this embodiment, as Figure 6 As shown, the protective box 3 has a spherical structure. When the high pressure inside the load switch body 1 breaks through the pressure relief plate 2 and the airflow enters the protective box 3, the spherical inner wall can evenly distribute the pressure to the entire box, preventing the protective box 3 from deforming or breaking due to excessive local stress.

[0022] In this embodiment, as Figure 6 As shown, a smooth circular tube 6 is provided inside the bellows 5. The bottom of the smooth circular tube 6 is fixedly connected to the bellows 5, while the top of the smooth circular tube 6 is not fixedly connected to the bellows 5. After the high-pressure airflow breaks through the pressure relief plate 2, it will first pass through the smooth circular tube 6. The smooth inner wall of the smooth circular tube 6 reduces airflow resistance, ensuring that the pressure enters the protective box 3 quickly and smoothly. At the same time, the bellows 5 will cause the protective box 3 to extend outward when it receives the impact force, which plays a buffering role.

[0023] In this embodiment, as Figure 1As shown, an annular movable plate 7 is connected to the outside of the protective box 3. A spring 8 is provided on the bottom surface of the annular movable plate 7. The two ends of the spring 8 are fixed to the bottom surface of the annular movable plate 7 and the outer wall of the load switch body 1, respectively. When the high-pressure airflow enters the protective box 3, it will generate an outward impact force on the protective box 3. At this time, the spring 8 will be stretched, and the impact force will be absorbed through elastic deformation, buffering the pressure relief impact force and stabilizing the position of the protective box 3.

[0024] In this embodiment, as Figure 1 As shown, four springs 8 are provided. The four springs 8 are evenly distributed on the outside of the protective box 3 and along its circumference to ensure that the protective box 3 is subjected to uniform elastic support force and to ensure the buffering effect.

[0025] In this embodiment, as Figure 7 As shown, the outer wall of the protective box 3 and the inner wall of the annular movable plate 7 are fixedly connected by a connecting rod 9. The connecting rod 9 rigidly fixes the annular movable plate 7 and the protective box 3. When the spring 8 is stretched or reset and drives the annular movable plate 7 to move, the protective box 3 can move synchronously.

[0026] In this embodiment, as Figure 4 As shown, a guide post 10 is provided inside the spring 8 on the load switch body 1, and a through hole 11 is provided on the annular movable plate 7 to allow the guide post 10 to pass through, forcing the annular movable plate 7 to move only along the axial direction of the guide post 10, thus ensuring the buffering effect of the spring 8.

[0027] In this embodiment, as Figure 4 As shown, the top of the guide post 10 extends out of the outer side of the annular movable plate 7 and is threaded with a nut 12 to limit the maximum displacement of the annular movable plate 7 and prevent the parts from falling off.

[0028] In this embodiment, as Figure 5 and Figure 6 As shown, a first fixing plate 13 is provided on the outside of the pressure relief plate 2 on the load switch body 1, and a second fixing plate 14 is provided on the bottom surface of the bellows 5. They are detachably connected by bolts, which facilitates the replacement of parts.

[0029] In summary, the load switch provided in this embodiment can efficiently relieve internal high pressure and avoid external risks. When the internal high pressure breaks through the pressure relief plate 2, the resulting large fragments are blocked by the protective box 3, preventing high-speed direct impact. Small fragments enter the protective box 3 with the airflow, are buffered and decelerated, and then dispersed and discharged at low speed from the pressure relief hole 4, posing no significant hazard. At the same time, the bellows 5 and the smooth circular tube 6 ensure smooth airflow, while the spring 8 and the guide column 10 buffer the impact and stabilize the structure. The entire design achieves rapid pressure relief to prevent equipment explosion, while reducing the risk of fragment ejection and component damage through multiple protections, balancing pressure relief efficiency and operational safety, and meeting the long-term stable operation requirements of the load switch.

[0030] The above description is only a further embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope disclosed by the present utility model, based on the technical solution and concept of the present utility model, shall fall within the protection scope of the present utility model.

Claims

1. An automatic pressure relief load switch, characterized in that: The load switch body (1) is provided with a pressure relief plate (2), a protective box (3) is provided on the outside of the pressure relief plate (2), a plurality of pressure relief holes (4) are provided on the protective box (3), and a bellows (5) is provided between the protective box (3) and the load switch body (1) on the outside of the pressure relief plate (2).

2. The automatic pressure relief load switch according to claim 1, characterized in that: The protective box (3) has a spherical structure.

3. The automatic pressure relief load switch according to claim 1, characterized in that: The corrugated pipe (5) has a smooth circular pipe (6) inside. The bottom of the smooth circular pipe (6) is fixedly connected to the corrugated pipe (5), and the top of the smooth circular pipe (6) is not fixedly connected to the corrugated pipe (5).

4. The automatic pressure relief load switch according to claim 1, characterized in that: The protective box (3) is connected to an annular movable plate (7) on the outside. A spring (8) is provided on the bottom surface of the annular movable plate (7). The two ends of the spring (8) are respectively fixed on the bottom surface of the annular movable plate (7) and the outer wall of the load switch body (1).

5. The automatic pressure relief load switch according to claim 4, characterized in that: Four springs (8) are provided, and the four springs (8) are evenly distributed on the outside of the protective box (3) and along its circumference.

6. The load switch with automatic pressure relief according to claim 4, characterized in that: The outer wall of the protective box (3) and the inner wall of the annular movable plate (7) are fixedly connected by a connecting rod (9).

7. The load switch with automatic pressure relief according to claim 4, characterized in that: The load switch body (1) has a guide post (10) inside the spring (8), and the annular movable plate (7) has a through hole (11) through which the guide post (10) passes.

8. The load switch with automatic pressure relief according to claim 7, characterized in that: The top of the guide post (10) extends out of the outer side of the annular movable plate (7) and is threaded with a nut (12).

9. The load switch with automatic pressure relief according to claim 1, characterized in that: The load switch body (1) has a first fixing plate (13) on the outside of the pressure relief plate (2), and the bottom surface of the bellows (5) has a second fixing plate (14).

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