A low-voltage switchgear with good protection

Abstract

This invention belongs to the field of switchgear technology, specifically relating to a low-voltage switchgear with good protection. It includes a switchgear body and a wall panel mounted on the switchgear body. A mounting base is provided on the wall panel, and a hollow piston rod is slidably mounted on the mounting base. The mounting base has an inclined groove. It also includes a shielding mechanism fixedly mounted on the hollow piston rod. In this low-voltage switchgear with good protection, the adjusting mechanism can control the normally open and reset states of the fixed plate. Rotating the upright causes the movable plate to press against the horizontal plate. After the hollow piston rod is triggered, the limiting plate deflects to restrict its position, keeping the fixed plate normally open. This facilitates continuous ventilation and heat dissipation, prevents rapid pressure buildup again, and alerts personnel to quickly locate the faulty switchgear body. When the movable plate separates from the horizontal plate, the hollow piston rod can enter a reset state, closing the pressure relief port after reset, thus continuing to protect the internal electrical components.

Description

Technical Field

[0001] This invention belongs to the field of switchgear technology, specifically relating to a low-voltage switchgear with good protection effect. Background Technology

[0002] Switchgear is a complete set of equipment used in power systems to control, protect and monitor electrical equipment. It realizes functions such as circuit switching control, fault protection and operation status monitoring. It is widely used in power generation, transmission and distribution. The pressure relief design of switchgear is an important part of ensuring its safe operation. When the components inside the cabinet cause arc discharge due to fault (such as short circuit), high temperature and high pressure gas will be generated instantly. The pressure relief structure can guide and release these gases in time to avoid the rapid accumulation of pressure inside the cabinet and cause the cabinet to explode.

[0003] In traditional pressure relief structures, the airflow discharge path is poorly designed. When gas is discharged through the pressure relief port, the obstruction of the airflow by the components often causes a sudden change in fluid direction, forming a "vortex zone" on the inside of the bend. This greatly increases the airflow discharge resistance, severely affecting the pressure relief efficiency and making it difficult to quickly and effectively release internal pressure, posing a safety hazard. On the other hand, most pressure relief devices cannot select the state after pressure relief as needed, cannot achieve continuous ventilation and heat dissipation after pressure relief, and cannot provide intuitive fault indications to personnel when a malfunction occurs. Summary of the Invention

[0004] The purpose of this invention is to provide a low-voltage switchgear with good protection that allows for switching the pressure relief port to remain open after pressure relief, in order to solve the above-mentioned problems.

[0005] The present invention achieves the above objectives through the following technical solutions:

[0006] A low-voltage switchgear with good protection includes a switchgear body and a wall panel disposed on the switchgear body. A mounting base is disposed on the wall panel, and a hollow piston rod is slidably disposed on the mounting base. An inclined groove is formed on the mounting base.

[0007] It also includes:

[0008] A shielding mechanism is fixedly mounted on a hollow piston rod, and the shielding mechanism includes a protruding rod that is slidably mounted in an inclined groove.

[0009] A limiting plate array is rotatably mounted on the hollow piston rod, and the rotation of the limiting plate restricts the position of the hollow piston rod on the mounting base;

[0010] An adjustment mechanism is provided on the blocking mechanism. By adjusting the position of the adjustment mechanism on the blocking mechanism, the adjustment mechanism comes into contact with the limiting plate.

[0011] As a further optimization of the present invention, the blocking mechanism further includes a fixing plate, on which a hollow threaded sleeve is fixedly disposed. The fixing plate is threaded onto the upper end of the hollow piston rod through the hollow threaded sleeve. A rotating plate is rotatably disposed on the fixing plate, and L-shaped rods are symmetrically fixedly disposed on the rotating plate. A protruding rod is fixedly disposed on the L-shaped rod. Both the fixing plate and the rotating plate are provided with through holes.

[0012] As a further optimization of the present invention, the hollow piston rod has a hollow structure, a partition plate is fixedly installed inside the hollow piston rod, a piston plate is fixedly installed at the lower end of the hollow piston rod, and clearance holes are arrayed at the upper end of the hollow piston rod, with the limiting plate rotatably installed in the clearance holes.

[0013] As a further optimization of the present invention, a horizontal plate is fixedly arranged on the limiting plate, and protrusions are provided on both sides of the horizontal plate.

[0014] As a further optimization of the present invention, the adjustment mechanism includes a vertical rod with a threaded portion, the vertical rod being threaded onto a fixed plate via the threaded portion, a knob being fixedly mounted on the upper end of the vertical rod, and a pressing component being mounted on the vertical rod.

[0015] As a further optimization of the present invention, the pressing component includes a base plate, which is fixedly mounted on the upright. A movable plate is sleeved on the upright, and a compression spring is sleeved on the upright. The two ends of the compression spring are fixedly connected to the movable plate and the base plate, respectively, and the movable plate is movably connected to the cross plate.

[0016] As a further optimization of the present invention, the mounting base is provided with a boss, the boss is provided with an array of vents, a fixing cylinder is fixedly provided on the boss, a sleeve is fixedly provided on the fixing cylinder, the sleeve is slidably sleeved on the hollow piston rod, the fixing cylinder is provided with an exhaust hole, and the inclined groove is provided on both sides of the boss.

[0017] As a further optimization of the present invention, a sealing sleeve is fixedly provided at the lower end of the fixed cylinder, a venting pipe is fixedly provided on the sealing sleeve, the hollow piston rod is slidably provided on the venting pipe, and a connecting groove is provided on the inner wall of the venting pipe.

[0018] As a further optimization of the present invention, a return spring is sleeved on the hollow piston rod, and the two ends of the return spring are respectively connected to the fixed cylinder and the piston plate.

[0019] As a further optimization of the present invention, a sealing ball is movably disposed inside the hollow piston rod, and the diameter of the sealing ball is larger than the inner diameter of the vent pipe.

[0020] The beneficial effects of this invention are as follows:

[0021] 1. Unlike existing technologies, in actual use, while the fixed plate is lifted, the protruding rod slides in the inclined groove to rotate the rotating plate and align the through holes, thereby reducing the airflow resistance and avoiding the formation of a "vortex zone" on the inside of the bend due to sudden changes in fluid direction, thus improving the pressure relief efficiency.

[0022] 2. Unlike existing technologies, in actual use, the adjustment mechanism can control the normally open and reset state of the fixed plate. Rotating the upright causes the movable plate to press against the horizontal plate. After the hollow piston rod is triggered, the limit plate deflects to restrict its position, keeping the fixed plate normally open. This facilitates continuous ventilation and heat dissipation, prevents pressure from accumulating rapidly again, and reminds staff to quickly locate the faulty switchgear body. When the movable plate separates from the horizontal plate, the hollow piston rod can enter the reset state. After resetting, the pressure relief port is closed, thus continuing to protect the internal electrical components. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the mounting base connection structure of the present invention;

[0025] Figure 3 This is an exploded structural diagram of the shielding mechanism of the present invention;

[0026] Figure 4 This is a schematic diagram of the connection structure of the shielding mechanism of the present invention;

[0027] Figure 5 This is the present invention. Figure 4 Schematic diagram of the partial section structure along LL;

[0028] Figure 6 This is the present invention. Figure 5 Enlarged structural diagram at point A in the middle;

[0029] Figure 7 This is the present invention. Figure 4 Explosion structure diagram;

[0030] Figure 8 This is a schematic diagram of the hollow piston rod structure of the present invention;

[0031] Figure 9 This is a schematic diagram of the adjustment mechanism structure of the present invention;

[0032] Figure 10 This is a schematic diagram of the sealing sleeve structure of the present invention;

[0033] Figure 11 This is a schematic diagram of the limiting plate structure of the present invention.

[0034] In the diagram: 1. Switch cabinet body; 11. Wall panel; 2. Mounting base; 21. Plug; 211. Vent; 22. Fixing cylinder; 221. Sleeve; 222. Exhaust hole; 3. Hollow piston rod; 31. Piston plate; 32. Clearance hole; 33. Partition plate; 4. Shielding mechanism; 41. Fixing plate; 411. Hollow threaded sleeve; 42. Rotating plate; 421. L-shaped rod; 422. Plug; 43. Through hole; 5. Return spring; 6. Sealing sleeve; 61. Vent pipe; 611. Connecting air groove; 7. Limiting plate; 71. Horizontal plate; 711. Plug; 8. Adjusting mechanism; 81. Vertical rod; 811. Threaded part; 82. Downward pressure assembly; 821. Base plate; 822. Compression spring; 823. Movable plate; 83. Knob; 9. Sealing ball; 10. Inclined groove. Detailed Implementation

[0035] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0036] Example: Figure 1 - Figure 11 As shown, a low-voltage switchgear with good protection includes a switchgear body 1 and a wall panel 11 mounted on the switchgear body 1. A mounting base 2 is provided on the wall panel 11, and a hollow piston rod 3 is slidably mounted on the mounting base 2. The hollow piston rod 3 has a hollow structure, and a return spring 5 is sleeved on the hollow piston rod 3. A partition plate 33 is fixedly installed inside the hollow piston rod 3, and a piston plate 31 is fixedly installed at the lower end of the hollow piston rod 3. A sealing ball 9 is movably installed inside the hollow piston rod 3. The hollow structure of the hollow piston rod 3 provides space for internal airflow and the movement of the sealing ball 9. The partition plate 33 can reasonably divide the internal space to ensure that each functional area operates independently. The return spring 5 provides the return force for the hollow piston rod 3, so that it can automatically return to the initial position after pressure relief.

[0037] The mounting base 2 is provided with a boss 21, on which vents 211 are arrayed. A fixing cylinder 22 is fixedly mounted on the boss 21, and a sleeve 221 is fixedly mounted on the fixing cylinder 22. The sleeve 221 is slidably sleeved on the hollow piston rod 3. The fixing cylinder 22 is provided with an exhaust hole 222. Inclined grooves 10 are provided on both sides of the boss 21. The two ends of the return spring 5 are respectively connected to the fixing cylinder 22 and the piston plate 31. A sealing sleeve 6 is fixedly mounted on the lower end of the fixing cylinder 22. A vent pipe 61 is fixedly mounted on the sealing sleeve 6. The hollow piston rod 3 is slidably mounted on the vent pipe 61. A connecting air groove 611 is provided on the inner wall of the vent pipe 61. The sealing ball... The diameter of the vent pipe 61 is larger than the inner diameter of the vent pipe 61. The vent ports 211 are arranged in an array, which can uniformly and quickly discharge the high-pressure gas in the switch cabinet body 1. The fixed cylinder 22 provides movement space for the hollow piston rod 3. The exhaust port 222 is set on the side wall, and the gas in the fixed cylinder 22 can be discharged efficiently, thereby avoiding the influence of gas pressure on the movement of the hollow piston rod 3. The sleeve 221 plays a guiding and limiting role for the hollow piston rod 3, ensuring its stable up and down sliding. The sealing sleeve 6 cooperates with the vent pipe 61 and, together with the sealing ball 9, realizes reliable control of the gas passage. The connecting gas groove 611 controls the speed at which the gas enters the hollow piston rod 3, ensuring its slow reset.

[0038] A blocking mechanism 4 is fixedly installed on the hollow piston rod 3. The blocking mechanism 4 includes a fixed plate 41, on which a hollow threaded sleeve 411 is fixedly installed. The fixed plate 41 is threaded onto the upper end of the hollow piston rod 3 through the hollow threaded sleeve 411. A rotating plate 42 is rotatably installed on the fixed plate 41. An L-shaped rod 421 is symmetrically fixedly installed on the rotating plate 42. A protruding rod 422 is fixedly installed on the L-shaped rod 421. Inclined grooves 10 are provided on both sides of the protruding seat 21. The protruding rod 422 is slidably installed in the inclined grooves 10. The groove 10 provides a track for the sliding of the protruding rod 422, thereby realizing the rotation of the rotating plate 42. Both the fixed plate 41 and the rotating plate 42 are provided with through holes 43. The fixed plate 41 is threadedly connected to the hollow piston rod 3 through the hollow threaded sleeve 411, which facilitates installation and disassembly and facilitates later maintenance and repair. The rotating plate 42 rotates when the protruding rod 422 slides along the inclined groove 10, so that the through holes 43 are aligned, optimizing the airflow discharge path, reducing resistance, greatly improving the pressure relief efficiency, and avoiding the inability of internal pressure to be released in time due to poor airflow.

[0039] A limiting plate 7 is rotatably arranged on the hollow piston rod 3. The center of gravity of the limiting plate 7 is low. By rotating the limiting plate 7, the position of the hollow piston rod 3 on the mounting base 2 is restricted. A horizontal plate 71 is vertically fixed on the limiting plate 7. The horizontal plate 71 and the limiting plate 7 form an L-shaped structure. Protrusions 711 are arranged on both sides of the horizontal plate 71. The upper end of the hollow piston rod 3 is provided with an array of clearance holes 32. The limiting plate 7 is rotatably positioned in the clearance holes 32. The protrusions 711 cannot pass through the clearance holes 32. The clearance holes 32 facilitate the installation and rotation of the limiting plate 7, creating conditions for the limiting function to be realized. The array distribution of the limiting plates 7 can limit the hollow piston rod 3 from multiple directions, enhancing the limiting stability. By rotating the limiting plate 7, the contact state between it and the mounting base 2 is changed, thereby controlling the position of the hollow piston rod 3 and realizing the switching between the normally open or reset position of the fixed plate 41.

[0040] An adjustment mechanism 8 is provided on the shielding mechanism 4. By adjusting the position of the adjustment mechanism 8 on the shielding mechanism 4, the adjustment mechanism 8 contacts the limiting plate 7. The adjustment mechanism 8 includes a vertical rod 81 with a threaded portion 811. The vertical rod 81 is threaded onto the fixed plate 41 through the threaded portion 811. A knob 83 is fixedly installed at the upper end of the vertical rod 81. A base plate 821 is provided on the vertical rod 81. A movable plate 823 is sleeved on the vertical rod 81. A compression spring 822 is sleeved on the vertical rod 81. Both ends of the compression spring 822 are fixedly connected to the movable plate 823 and the base plate 821, respectively. The movable plate 823 is movably connected to the horizontal plate 71. The vertical rod 81 is connected to the fixed plate 41 through the threaded portion 811, allowing the operator to manually adjust the adjustment mechanism using the knob 83. Adjustment; the compression spring 822 cooperates with the movable plate 823 to quickly release energy to drive the limit plate 7 to rotate after the hollow piston rod 3 is triggered, so that the fixed plate 41 remains open to meet the needs of continuous ventilation and heat dissipation; the setting of the horizontal plate 71 and the protrusion 711 provides the action point for the adjustment mechanism 8, so that the adjustment mechanism 8 can accurately control the rotation of the limit plate 7 and ensure the reliable realization of the limit function; by rotating the knob 83 to adjust the position of the upright 81, the movable plate 823 can be separated from the horizontal plate 71, and the hollow piston rod 3 can be slowly reset, which provides a guarantee for the stable operation of the switch cabinet under different working conditions.

[0041] It should be noted that during the pressure relief process, all components of this low-voltage switchgear work together to achieve efficient pressure relief and precise control. The specific working principle is as follows: When high-temperature and high-pressure gas is generated inside the switchgear body 1 due to a fault or other reasons, the gas first pushes up the fixing plate 41 fixedly set on the upper end of the hollow piston rod 3 through the vents 211 arrayed on the boss 21. At the same time, the sealing ball 9 located inside the hollow piston rod 3 is also pushed up, causing the vent pipe 61 to open. During this process, the hollow piston rod 3 moves upward against the resistance of the return spring 5, the return spring 5 is compressed and stores energy, and the gas in the fixed cylinder 22 is discharged through the exhaust hole 222 opened on its side wall, achieving rapid pressure relief.

[0042] During the process of the fixed plate 41 being lifted, the protruding rod 422 fixed on the rotating plate 42 slides along the inclined grooves 10 on both sides of the protrusion 21. Due to the special structural design of the inclined grooves 10, the sliding of the protruding rod 422 causes the rotating plate 42 to rotate around the rotational connection point between it and the fixed plate 41, thereby aligning the through hole 43 on the rotating plate 42 with the through hole 43 on the fixed plate 41, allowing the gas to be smoothly discharged directly from the through hole 43, reducing the resistance to airflow discharge and improving the pressure relief efficiency.

[0043] After depressurization, the internal pressure decreases, and the sealing ball 9, due to its own weight and the change in air pressure inside the hollow piston rod 3, re-seals the vent pipe 61. At this time, the gas inside the hollow piston rod 3 slowly enters the air through the connecting air groove 611 opened on the inner wall of the vent pipe 61. Because the air passage of the connecting air groove 611 is limited, the hollow piston rod 3 can slowly reset, avoiding excessively fast reset speed, which would cause the internal pressure of the cabinet to be unbalanced with the external atmospheric pressure, and the pressure inside the switch cabinet body 1 to be not completely released.

[0044] The normally open and reset control of the fixed plate 41 is achieved through the adjusting mechanism 8. When the upright 81 is rotated, it moves downward on the fixed plate 41 via the threaded part 811. The base plate 821 fixed on the upright 81 descends accordingly, the compression spring 822 is compressed and stores energy, and the movable plate 823 exerts a downward compressive force on the horizontal plate 71 fixed on the limiting plate 7. When the hollow piston rod 3 is not triggered, the sleeve 221 restricts the limiting plate 7, keeping it in its initial state. When the hollow piston rod 3 is triggered and moves upward, the limiting plate 7 moves away from the sleeve 221 by a certain distance. The compressed compression spring 822 releases energy, pushing the movable plate 823 downward, thereby compressing the horizontal plate 71 and causing the limiting plate 7 to deflect. After the limiting plate 7 deflects, it forms a limiting structure with the inner wall of the fixed cylinder 22, restricting the position of the hollow piston rod 3 on the fixed cylinder 22, thus keeping the fixed plate 41 in the normally open position. This normally open state is necessary in some operating conditions that require continuous ventilation and heat dissipation or to prevent the rapid re-accumulation of pressure. It can effectively ensure the stability of the internal environment of the switchgear. At the same time, the normally open fixed plate 41 can remind the staff and quickly locate the switchgear body 1 that has malfunctioned. To release the normally open state, the movable plate 823 is moved away from the horizontal plate 71 by rotating the knob 83, so that the limit plate 7 can rotate freely. At this time, the hollow piston rod 3 is moved up a certain distance to completely separate the limit plate 7 from the fixed cylinder 22. Thus, the limit plate 7 is reset under its own weight, and the hollow piston rod 3 can move along the sleeve 221.

[0045] When the upright rod 81 is rotated to separate the movable plate 823 from the horizontal plate 71, the limiting plate 7 is no longer subjected to the force of the compression spring 822, and the hollow piston rod 3 can return to the slow reset state. In some cases where the time requirement for the switchgear to return to normal working state is not urgent, the fixed plate 41 entering the reset state can better protect the internal electrical components of the switchgear.

[0046] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A low-voltage switchgear with good protection effect, comprising a switchgear body (1) and a wall panel (11) disposed on the switchgear body (1), wherein a mounting base (2) is disposed on the wall panel (11), and a hollow piston rod (3) is slidably disposed on the mounting base (2), characterized in that: The mounting base (2) is provided with a slanted groove (10); It also includes: The shielding mechanism (4) is fixedly mounted on the hollow piston rod (3). The shielding mechanism (4) includes a protruding rod (422), which is slidably mounted in the inclined groove (10). The shielding mechanism (4) also includes a fixing plate (41). Limiting plate (7), the limiting plate (7) array is rotatably mounted on hollow piston rod (3), the position of hollow piston rod (3) on mounting base (2) is limited by the rotation of the limiting plate (7), and a horizontal plate (71) is fixedly mounted on the limiting plate (7). Adjustment mechanism (8), which is set on the blocking mechanism (4), and by adjusting the position of the adjustment mechanism (8) on the blocking mechanism (4), the adjustment mechanism (8) is brought into contact with the limiting plate (7); The adjustment mechanism (8) includes a vertical rod (81), a threaded part (811) is provided on the vertical rod (81), the vertical rod (81) is threaded on the fixed plate (41) through the threaded part (811), a knob (83) is fixedly provided at the upper end of the vertical rod (81), and a pressing component (82) is provided on the vertical rod (81). The pressing assembly (82) includes a base plate (821), which is fixedly mounted on the upright (81). A movable plate (823) is sleeved on the upright (81), and a compression spring (822) is sleeved on the upright (81). The two ends of the compression spring (822) are fixedly connected to the movable plate (823) and the base plate (821) respectively. The movable plate (823) is movably connected to the cross plate (71).

2. The low-voltage switchgear with good protection effect according to claim 1, characterized in that: A hollow threaded sleeve (411) is fixedly provided on the fixed plate (41). The fixed plate (41) is threaded onto the upper end of the hollow piston rod (3) through the hollow threaded sleeve (411). A rotating plate (42) is rotatably provided on the fixed plate (41). An L-shaped rod (421) is symmetrically fixed on the rotating plate (42). A protruding rod (422) is fixedly provided on the L-shaped rod (421). Both the fixed plate (41) and the rotating plate (42) are provided with through holes (43).

3. The low-voltage switchgear with good protection effect according to claim 1, characterized in that: The hollow piston rod (3) is a hollow structure. A partition plate (33) is fixedly installed inside the hollow piston rod (3). A piston plate (31) is fixedly installed at the lower end of the hollow piston rod (3). A clearance hole (32) is arrayed at the upper end of the hollow piston rod (3). The limiting plate (7) is rotatably installed in the clearance hole (32).

4. A low-voltage switchgear with good protection effect according to claim 2, characterized in that: The horizontal plate (71) has protrusions (711) on both sides.

5. A low-voltage switchgear with good protection effect according to claim 3, characterized in that: The mounting base (2) is provided with a boss (21), and an array of vents (211) are provided on the boss (21). A fixing cylinder (22) is fixedly provided on the boss (21), and a sleeve (221) is fixedly provided on the fixing cylinder (22). The sleeve (221) is slidably sleeved on the hollow piston rod (3). An exhaust hole (222) is provided on the fixing cylinder (22). The inclined groove (10) is provided on both sides of the boss (21).

6. A low-voltage switchgear with good protection effect according to claim 5, characterized in that: A sealing sleeve (6) is fixedly installed at the lower end of the fixed cylinder (22), and a vent pipe (61) is fixedly installed on the sealing sleeve (6). The hollow piston rod (3) is slidably installed on the vent pipe (61), and a connecting air groove (611) is opened on the inner wall of the vent pipe (61).

7. A low-voltage switchgear with good protection effect according to claim 5, characterized in that: A return spring (5) is sleeved on the hollow piston rod (3), and the two ends of the return spring (5) are connected to the fixed cylinder (22) and the piston plate (31) respectively.

8. A low-voltage switchgear with good protection effect according to claim 6, characterized in that: A sealing ball (9) is movably disposed inside the hollow piston rod (3), and the diameter of the sealing ball (9) is larger than the inner diameter of the vent pipe (61).

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