Ring main unit and pressure relief assembly thereof

Abstract

The ring main unit comprises a ring main unit body, the pressure relief assembly installed in the ring main unit body and a pressure relief valve installed at the left end of the ring main unit body, the pressure relief assembly and the pressure relief valve are communicated with each other through a pipeline, the pressure relief assembly comprises a rectangular square frame, and a sealing cover is fixed to the left end of the square frame. The right end of the square frame is fixed to the ring main unit body, a cavity formed among the square frame, the sealing cover and the ring main unit body is a negative pressure cavity, the left end of the sealing cover is provided with an X-shaped movable frame, the pressure relief assembly is used for suddenly reducing suddenly increased air pressure, and the situation that the device is damaged due to the fact that the air pressure is too large is prevented; the connector lugs of the device are all arranged in the collecting cover, the positions where electric arcs are generated are concentrated in the collecting cover, the positions where the electric arcs are generated can be narrowed, the compressed length of the main adjusting spring is adjusted by twisting the main adjusting handle of the main adjusting piece, and the pressure relief value of the pressure relief valve can be adjusted in a large range.

Description

Technical Field

[0001] The invention relates to the technical field of ring main unit pressure relief, and in particular to a ring main unit and a pressure relief component thereof. Background Art

[0002] A ring main unit is a group of electrical equipment that is installed in a metal or non-metal insulated ring main unit or is made into an assembled interval ring main unit power supply unit. The ring main unit is usually equipped with a ring main unit air chamber, and the air chamber is filled with insulating gas at a certain pressure to ensure the safe operation of the ring main unit. The insulating gas filled in the existing ring main unit air chamber is mostly SF6 gas, which has strong insulation and arc extinguishing capabilities. When an arc fault occurs in the air chamber of the ring main unit, the gas in the air chamber of the ring main unit will react with the arc, causing the pressure in the air chamber of the ring main unit to rise suddenly. In order to reduce the pressure of the gas on the air chamber of the ring main unit and ensure the personal safety of the operators, a pressure relief device is usually installed on the air chamber of the ring main unit to quickly discharge the gas from the air chamber of the ring main unit to relieve the pressure on the ring main unit.

[0003] The following problems may be encountered during the pressure relief process of the existing ring main unit:

[0004] 1. Due to the different sizes and materials of the ring network cabinets, the air pressure that the insulating air chamber of the ring network cabinet can withstand is also different. The pressure relief valve used in the existing ring network cabinet releases the gas pressure through a spring and a sealing plug. However, the pressure of the existing pressure relief valve is fixed and cannot be applied to different ring network cabinets. When the pressure borne by the air chamber of the ring network cabinet does not match the pressure relief valve, the air pressure in the air chamber of the ring network cabinet will be too low, causing a discharge fault inside the air chamber of the ring network cabinet.

[0005] 2. When an arc fault occurs in the air chamber of the ring network cabinet, the gas in the air chamber of the ring network cabinet will react with the arc, causing the pressure in the air chamber of the ring network cabinet to suddenly increase. The existing ring network cabinet cannot promptly release the suddenly increased pressure due to the small pressure relief port of the pressure relief valve, which affects the pressure relief effect. At the same time, when an arc occurs inside the existing ring network cabinet, it is impossible to determine the location where the arc is generated, and then it is impossible to determine the location where the pressure is generated, which makes the installation position of the pressure relief valve uncertain, affecting the pressure relief effect of the air chamber of the ring network cabinet. Summary of the invention

[0006] In view of the above problems, the present invention provides a ring main unit and a pressure relief component thereof, which solve the above problems in the prior art.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a ring network cabinet and a pressure relief component thereof, comprising a ring network cabinet body and a pressure relief component installed inside the ring network cabinet body, and a pressure relief valve installed at the left end of the ring network cabinet body, wherein the pressure relief component and the pressure relief valve are connected to each other through a pipeline, and the pressure relief component comprises a rectangular frame, a sealing cover is fixed to the left end of the frame, and the right end of the frame is fixed to the ring network cabinet body, and the chamber formed between the frame, the sealing cover and the ring network cabinet body is a negative pressure chamber, and an X-shaped movable frame is provided at the left end of the sealing cover, and fixing rods fixedly connected to the ring network cabinet body are conveniently provided at the four corners of the movable frame, and first springs are respectively provided on the outer sides of the fixing rods, and a plurality of impact cones are fixed to the right end of the movable frame, and the impact cones correspond to the four corners of the sealing cover;

[0008] The lower end of the pressure relief valve is connected to a collection tank in a negative pressure state. The pressure relief valve includes a cylindrical shell, an end cover is fixed to the left end of the shell, a connecting head is fixed to the right end of the shell, a pressure relief regulating assembly is arranged inside the shell, and the pressure relief regulating assembly includes a main regulating part and a secondary regulating part. The lower end of the shell is connected to a conduit, a plug is tightly contacted with the left side of the connecting head, a sliding rod is fixed to the left side of the plug, a sliding sleeve is slidably connected to the left side of the sliding rod, and the left side of the sliding sleeve is fixed to the shell.

[0009] Preferably, the intersection of the X-shaped movable frame is disc-shaped, the sealing cover is made of glass, a through hole is opened at the front end of the square frame, and the square frame is connected to the pressure relief valve through the through hole.

[0010] Preferably, the main adjusting part includes a main adjusting spring sleeved on the outside of the sliding rod, one end of the main adjusting spring is fixedly connected to the plug, the other end of the main adjusting spring is fixed with a spring seat slidably connected to the sliding rod, the left end of the spring seat is fixed with a threaded barrel, the left end of the threaded barrel is threadedly connected with a threaded rod, the threaded rod is rotatably connected to the end cover and the left end passes through the end cover to fix the main adjusting handle.

[0011] Preferably, the secondary adjusting member comprises a fixing ring fixedly connected to the plug, a plurality of guide rods are fixed to the left end of the fixing ring along its circumference, secondary adjusting springs are respectively provided on the outer sides of the guide rods, the left ends of the guide rods are respectively slidably connected to the guide rings, the guide rings are slidably connected to the shell body through a slot, a threaded sleeve is fixed to the left end of the guide ring, a threaded column is threadedly connected to the left end of the threaded sleeve, the threaded column is rotatably connected to the end cover and the left end of the threaded column passes through the end cover to fix a secondary adjusting handle.

[0012] Preferably, the elastic coefficient of the main adjusting spring is much greater than the elastic coefficient of the secondary adjusting spring.

[0013] Preferably, the plug is in a truncated cone shape and a sealing ring is fixed on the inclined surface, and sealing rings are respectively provided at the connection points of the shell, the end cover and the connector.

[0014] Preferably, the conduit is connected to the collecting tank via a flange, a one-way valve is provided at the air inlet of the collecting tank, the interior of the sliding sleeve is hollow and the inner wall is symmetrically provided with convex strips, the outer wall of the sliding rod is symmetrically provided with grooves, the grooves of the sliding rod correspond to the convex strips of the sliding sleeve, and the sliding rod is slidably connected to the sliding sleeve via the grooves and the convex strips.

[0015] A ring network cabinet comprises a ring network cabinet body, the right end of the ring network cabinet body is rotatably connected to a cabinet door, the right end of the cabinet door is fixed with a cabinet lock, the interior of the ring network cabinet body is fixed with a horizontal plate and the interior of the ring network cabinet body is divided into an insulating air chamber and a display chamber, and a pressure relief component and a buffer collection component are arranged in the insulating air chamber.

[0016] Preferably, the buffer collection assembly includes a collection cover, the left end of the collection cover is rotatably connected to one end of two sets of symmetrically arranged connecting rods, the other end of the connecting rod is rotatably connected to a slider, and fixed bars are symmetrically fixed in the insulating air chamber, and rectangular through holes are symmetrically opened at the upper ends of the fixed bars, and the slider is slidably connected in the through holes of the fixed bars, and one end of the second spring is fixed to the opposite side of the slider, and the other end of the second spring is fixedly connected to the fixed bar.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. By twisting the main adjusting handle of the main adjusting part to adjust the compressed length of the main adjusting spring, it is beneficial to adjust the pressure relief pressure value of the pressure relief valve in a large range. At the same time, by twisting the secondary adjusting handle of the secondary adjusting part to adjust the compressed length of the secondary adjusting spring, it is beneficial to adjust the pressure relief pressure value of the pressure relief valve in a small range. Through the cooperation of the main adjusting part and the secondary adjusting part, it is beneficial to accurately adjust the pressure relief pressure value of the pressure relief valve, so that the pressure relief valve can be suitable for ring network cabinet bodies with different air pressures according to the different sizes of the ring network cabinet body and the different materials of the ring network cabinet body, so as to prevent the pressure relief valve from not matching the air pressure that the ring network cabinet body can withstand, resulting in too low air pressure in the insulating air chamber of the ring network cabinet body, causing discharge failure inside the air chamber of the ring network cabinet body.

[0019] 2. By setting up a buffer collecting component, all the wiring heads of the device are set inside the collecting cover, so that the location where the arc is generated is concentrated in the collecting cover, which is beneficial to reducing the location where the arc is generated. After the arc is generated, the air pressure in the arc accessories suddenly increases. At this time, the air pressure diffuses outward. Due to the action of the collecting cover, the suddenly increased air pressure is collected and impacted to the left and right sides of the collecting cover. The components on the left side of the collecting cover buffer the air pressure, and the air pressure on the right side of the collecting cover rushes to the pressure relief component to achieve the effect of sudden reduction of air pressure.

[0020] 3. The suddenly increased air pressure is suddenly reduced by the pressure relief component to prevent the device from being damaged due to excessive air pressure. The suddenly increased air pressure impacts the movable frame, and the movable frame moves to break the sealing cover through the impact cone. A negative pressure cavity is formed between the square frame, the sealing cover and the ring network cabinet body. After the sealing cover is broken, the negative pressure cavity is directly connected to the inside of the ring network cabinet body, and the suddenly increased air pressure is balanced to reduce the suddenly increased air pressure to prevent damage to the internal components of the ring network cabinet body. At the same time, if the air pressure after the sudden drop continues to be higher than the air pressure that the ring network cabinet body can withstand, the air pressure inside the ring network cabinet body enters the pressure relief valve through the through hole, and then the excess gas in the ring network cabinet body is stored in the collection tank, so that the air pressure in the ring network cabinet body is reduced to the air pressure range that the ring network cabinet body can withstand. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a partial cross-sectional schematic diagram of the present invention;

[0023] Figure 3 It is an overall schematic diagram of the pressure relief assembly of the present invention;

[0024] Figure 4 It is a partial cross-sectional schematic diagram of the pressure relief valve of the present invention;

[0025] Figure 5 It is a schematic diagram of the explosion of the pressure relief valve of the present invention;

[0026] Figure 6 It is an overall schematic diagram of the pressure relief regulating assembly of the present invention;

[0027] Figure 7 It is an overall schematic diagram of the main adjusting member of the present invention;

[0028] Figure 8 It is an overall schematic diagram of the secondary adjusting member of the present invention;

[0029] Fig. 9 It is an overall schematic diagram of the buffer collection component of the present invention.

[0030] Notes in the figure: 1. Ring main unit; 2. Pressure relief assembly; 3. Buffer collection assembly; 4. Pressure relief valve; 5. Collection tank; 6. Pressure relief adjustment assembly; 101. Cabinet door; 102. Cabinet lock; 201. Frame; 202. Sealing cover; 203. Movable frame; 204. Impact cone; 205. Fixed rod; 206. First spring; 207. Through hole; 301. Collection cover; 302. Connecting rod; 303. Fixed strip; 304. Second spring; 305. Slider; 41. Shell; 42. End cover; 43. Connector; 44. Conduit; 45. Plug; 61. Primary adjusting member; 62. Secondary adjusting member; 451. Sliding rod; 452. Sliding sleeve; 611. Primary adjusting spring; 612. Spring seat; 613. Threaded barrel; 614. Threaded rod; 615. Primary adjusting handle; 621. Fixing ring; 622. Guide rod; 623. Secondary adjusting spring; 624. Guide ring; 625. Threaded sleeve; 626. Threaded column; 627. Secondary adjusting handle. DETAILED DESCRIPTION

[0031] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0032] See also Figure 1 Figure 2 and Figure 3A pressure relief assembly comprises a ring network cabinet body 1 and a pressure relief assembly 2 installed inside the ring network cabinet body 1, and a pressure relief valve 4 installed at the left end of the ring network cabinet body 1, wherein the pressure relief assembly 2 and the pressure relief valve 4 are connected to each other through a pipeline, and the pressure relief assembly 2, the pressure relief valve 4 and the collecting tank 5 form a complete pressure relief assembly, wherein the pressure relief assembly 2 is used to relieve the rapidly increased air pressure inside the ring network cabinet body 1 to prevent the suddenly increased air pressure from affecting the components inside the ring network cabinet body 1 and causing damage, and the pressure relief valve 4 is used to slowly relieve the pressure, and the pressure relief assembly 2 comprises a rectangular frame 201, and a sealing cover 202 is fixed to the left end of the frame 201, and the frame 201 The right end is fixed on the ring network cabinet body 1, and the chamber formed between the square frame 201, the sealing cover 202 and the ring network cabinet body 1 is a negative pressure chamber. The connection between the square frame 201, the sealing cover 202 and the ring network cabinet body 1 is sealed to ensure the sealing of the negative pressure chamber and prevent leakage of the negative pressure chamber, which causes the pressure relief component 2 to fail to achieve the effect of sudden drop in air pressure. The left end of the sealing cover 202 is provided with an X-shaped movable frame 203, and the four corners of the movable frame 203 are conveniently provided with fixing rods 205 fixedly connected to the ring network cabinet body 1, and the outer sides of the fixing rods 205 are respectively provided with first springs 206. The right end of the movable frame 203 is fixed There are multiple impact cones 204, and the impact cones 204 correspond to the four corners of the sealing cover 202. By setting the impact cone 204 to a cone shape and making the impact cone 204 correspond to the four corners of the sealing cover 202, it is beneficial for the impact cone 204 to break the sealing cover 202 more easily, so that the negative pressure chamber is connected to the inside of the ring network cabinet body 1, and the effect of sudden drop in air pressure is achieved. The intersection of the X-shaped movable frame 203 is disc-shaped, and the intersection of the movable frame 203 is set to a disc shape, so that it can withstand the air pressure collected and impacted by the collecting cover 301, and then push the movable frame 203 to make the impact cone 204 break the sealing cover 202. The sealing cover 202 is made of glass A through hole 207 is provided at the front end of the frame 201, and the frame 201 is connected with the pressure relief valve 4 through the through hole 207. The suddenly increased air pressure is suddenly reduced through the pressure relief assembly 2 to prevent the device from being damaged by excessive air pressure. The suddenly increased air pressure impacts the movable frame 203, and the movable frame 203 moves through the impact cone 204 to break the sealing cover 202. A negative pressure cavity is formed between the frame 201, the sealing cover 202 and the ring network cabinet body 1. After the sealing cover 202 is broken, the negative pressure cavity is directly connected to the interior of the ring network cabinet body 1, and the suddenly increased air pressure is balanced, so that the suddenly increased air pressure is suddenly reduced, and the internal components of the ring network cabinet body 1 are prevented from being damaged.

[0033] See also Figure 2 and Figure 4The lower end of the pressure relief valve 4 is connected with a collecting tank 5, and the conduit 44 is connected with the collecting tank 5 through a flange. The air inlet of the collecting tank 5 is provided with a one-way valve. After the pressure relief component 2 releases pressure, the air pressure in the ring network cabinet body 1 is still higher than the air pressure range that the ring network cabinet body 1 can withstand. The pressure relief valve 4 sucks the excess gas into the collecting tank 5 through the negative pressure collecting tank 5 for storage, and controls the air pressure range in the ring network cabinet body 1 within the range that the ring network cabinet body 1 can withstand. The excess gas in the ring network cabinet body 1 is stored through the collecting tank 5, which is convenient for centralized treatment of the gas. The collecting tank 5 is cylindrical, with a maximum The pressure on the inner wall of the collection tank 5 is reduced to a great extent, so that the force is concentrated in the center of the collection tank 5, avoiding the collection tank 5 from deforming or exploding, and other dangerous situations. At the same time, the cylindrical design can ensure that the collection tank 5 has the greatest stability and reliability, and reduce the ratio of the volume of the stored gas to the weight of the tank body. By setting a one-way valve at the air inlet of the collection tank 5, it is prevented that the SF6 gas inside the collection tank 5 escapes when the collection tank 5 is replaced. The pressure relief valve 4 includes a cylindrical shell 41, and an end cover 42 is fixed to the left end of the shell 41. The shell 41 is used to protect the components inside the shell 41, and at the same time, it is used to The excess gas in the ring network cabinet body 1 is transferred, and the shell 41 is connected with the conduit 44, and the excess gas is guided to the collection tank 5 for storage, so as to facilitate the centralized treatment of SF6. The shell 41 is fixedly connected with the end cover 42, and a sealing ring is provided at the connection to ensure the sealing of the connection between the shell 41 and the end cover 42, so as to further prevent SF6 leakage. A connector 43 is fixed at the right end of the shell 41, and the connector 43 is used to fix the pressure relief valve 4. The ring network cabinet body 1 is clamped in the middle by the shell 41 and the connector 43 to complete the fixing of the pressure relief valve 4. At the same time, the shell 41 and the connector are fixed. A sealing ring is provided at the contact point between the head 43 and the ring network cabinet body 1, and a sealing ring is also provided at the connection point between the shell 41 and the connecting head 43 to ensure the sealing of the connection. A pressure relief regulating assembly 6 is provided inside the shell 41, and the pressure relief regulating assembly 6 includes a main regulating member 61 and a secondary regulating member 62. The lower end of the shell 41 is connected with a conduit 44, and a plug 45 is in close contact with the left side of the connecting head 43. A sliding rod 451 is fixed to the left side of the plug 45, and a sliding sleeve 452 is slidably connected to the left side of the sliding rod 451. The sliding rod 451 is slidably connected to the sliding sleeve 452, and the sliding rod 451 is slidably connected to the sliding sleeve 452, so as to facilitate the pressure relief pressure regulation of the pressure relief valve 4.

[0034] See also Figure 4 , Figure 5 and Figure 6The left side of the sliding sleeve 452 is fixed on the shell 41, the interior of the sliding sleeve 452 is hollow and the inner wall is symmetrically provided with convex strips, the outer wall of the sliding rod 451 is symmetrically provided with grooves, the grooves of the sliding rod 451 correspond to the convex strips of the sliding sleeve 452, the sliding rod 451 is slidably connected with the sliding sleeve 452 through the grooves and the convex strips, the plug 45 is truncated cone-shaped and a sealing ring is fixed on the inclined surface, and sealing rings are respectively provided at the connection points of the shell 41, the end cover 42 and the connecting head 43. If the air pressure after the sudden drop through the pressure relief component 2 continues to be higher than the air pressure that the ring network cabinet body 1 can withstand, the pressure relief valve 4 and the collecting tank 5 cooperate to relieve the pressure of the air in the ring network cabinet body 1 after the sudden drop, and the air pressure inside the ring network cabinet body 1 enters the pressure relief valve 4 through the through hole 207, and then the excess gas in the ring network cabinet body 1 is stored in the collecting tank 5, so that the air pressure in the ring network cabinet body 1 is reduced to the air pressure range that the ring network cabinet body 1 can withstand.

[0035] See also Figure 6 and Figure 7 The main adjusting member 61 includes a main adjusting spring 611 sleeved on the outside of the slide rod 451, one end of the main adjusting spring 611 is fixedly connected to the plug 45, and the other end of the main adjusting spring 611 is fixed with a spring seat 612 slidably connected to the slide rod 451, and the spring seat 612 is used to squeeze the main adjusting spring 611, change the compressed length of the main adjusting spring 611, and then increase the elastic force of the main adjusting spring 611, thereby increasing the pressure relief gas pressure, changing the pressure relief value of the pressure relief valve 4, and making the pressure relief valve 4 The applicability is greater. A threaded barrel 613 is fixed to the left end of the spring seat 612. A threaded rod 614 is threadedly connected to the left end of the threaded barrel 613. The threaded rod 614 is rotatably connected to the end cover 42 and a main adjusting handle 615 is fixed to the left end passing through the end cover 42. The threaded barrel 613 is threadedly connected to the threaded barrel 613 through the threaded rod 614. By twisting the main adjusting handle 615, the spring seat 612 is moved through the threaded connection between the threaded rod 614 and the threaded barrel 613, thereby achieving the effect of adjusting the elastic force of the main adjusting spring 611.

[0036] See also Figure 6 and Figure 8The secondary adjusting member 62 includes a fixing ring 621 fixedly connected to the plug 45, a plurality of guide rods 622 are fixed to the left end of the fixing ring 621 along its circumference, and secondary adjusting springs 623 are respectively arranged on the outer sides of the guide rods 622, and guide rings 624 are respectively slidably connected to the left ends of the guide rods 622, and the guide rings 624 are used to squeeze the secondary adjusting springs 623, change the compressed length of the secondary adjusting springs 623, and thereby increase the elastic force of the secondary adjusting springs 623, thereby increasing the pressure relief gas pressure, changing the pressure relief value of the pressure relief valve 4, and making the pressure relief valve 4 more applicable, and at the same time by Since the elastic coefficient of the main regulating spring 611 is much larger than that of the secondary regulating spring 623, the secondary regulating spring 623 can adjust the pressure relief value of the pressure relief valve 4 within a relatively small range, thereby increasing the precision of adjusting the pressure relief value of the pressure relief valve 4. The guide ring 624 is slidably connected to the housing 41 in the form of a card slot to prevent the guide ring 624 from rotating. At the same time, the guide ring 624 is guided by the guide rod 622 to make the guide ring 624 slide more smoothly. A threaded sleeve 625 is fixed to the left end of the guide ring 624, and a threaded column 626 is connected to the left end of the threaded sleeve 625 through a thread. The threaded column 626 is rotatably connected to the end cover 42, and the left end of the threaded column 626 passes through the end cover 42 and is fixed with a secondary adjustment handle 627, which is threadedly connected to the threaded column 626 through the threaded sleeve 625. By twisting the secondary adjustment handle 627, the guide ring 624 is moved through the threaded connection between the threaded sleeve 625 and the threaded column 626 to achieve the effect of adjusting the elastic force of the secondary adjustment spring 623. By twisting the main adjustment handle 615 of the main adjustment member 61 to adjust the compressed length of the main adjustment spring 611, it is beneficial to adjust the pressure relief pressure value of the pressure relief valve 4 over a wide range. At the same time, by twisting the secondary adjustment member 62 The adjusting handle 627 is used to adjust the compressed length of the secondary adjusting spring 623, which is beneficial to adjusting the pressure relief pressure value of the pressure relief valve 4 in a small range. The cooperation between the main adjusting member 61 and the secondary adjusting member 62 is beneficial to accurately adjust the pressure relief pressure value of the pressure relief valve 4, so that the pressure relief valve 4 can be suitable for the ring network cabinet body 1 with different air pressures according to the different sizes and materials of the ring network cabinet body 1, so as to prevent the mismatch between the air pressure that the pressure relief valve 4 can withstand and the ring network cabinet body 1, resulting in too low air pressure in the insulating air chamber of the ring network cabinet body 1, causing a discharge fault inside the air chamber of the ring network cabinet body 1.

[0037] See also Figure 1 , Figure 2 and Fig. 9A ring network cabinet comprises a ring network cabinet body 1, wherein the right end of the ring network cabinet body 1 is rotatably connected to a cabinet door 101, wherein the cabinet door 101 is used to seal the insulating gas chamber of the ring network cabinet body 1, and a sealing ring is provided on the left side of the cabinet door 101 to ensure the sealing of the insulating gas chamber and prevent the SF6 gas in the insulating gas chamber from escaping, wherein a cabinet lock 102 is fixed to the right end of the cabinet door 101, wherein the cabinet lock 102 is a prior art and will not be described in detail herein, wherein the cabinet lock 102 is used to fix the cabinet door 101, wherein a horizontal plate is fixed inside the ring network cabinet body 1 and the inside of the ring network cabinet body 1 is divided into an insulating gas chamber and a second insulating gas chamber. The inner space of the ring main unit body 1 is divided into an insulating air chamber and a display chamber by a horizontal plate, so that the components in the insulating air chamber and the display chamber do not affect each other. A pressure relief component 2 and a buffer collection component 3 are arranged in the insulating air chamber. The buffer collection component 3 includes a collection cover 301. The left end of the collection cover 301 is rotatably connected to one end of two sets of connecting rods 302 symmetrically arranged. The other end of the connecting rod 302 is rotatably connected to a slider 305. After the collection cover 301 is impacted by air pressure, the collection cover 301 squeezes the connecting rod 302 to move to the left, causing the slider 305 to move in the rectangular passage of the fixed bar 303. The slider 305 slides in the hole, thereby squeezing the second spring 304 for buffering to prevent the sudden increase in air pressure from directly acting on the inside of the ring network cabinet body 1. When the air pressure in the ring network cabinet body 1 is stable, the second spring 304 pushes the slider 305 back to the initial position, and then the collecting cover 301 is restored to the initial position through the connecting rod 302. The insulating air chamber is symmetrically fixed with fixing bars 303, and the upper ends of the fixing bars 303 are symmetrically provided with rectangular through holes. The slider 305 is slidably connected in the through holes of the fixing bars 303, and one end of the second spring 304 is fixed to the opposite side of the slider 305. The other end of the second spring 304 is fixedly connected to the fixed bar 303. By setting up the buffer collecting component 3, the terminal ends of the device are all set inside the collecting cover 301, so that the position where the arc is generated is concentrated in the collecting cover 301, which is beneficial to reducing the position where the arc is generated. After the arc is generated, the air pressure in the arc accessories suddenly increases. At this time, the air pressure diffuses outward. Due to the action of the collecting cover 301, the suddenly increased air pressure is collected and impacted to the left and right sides of the collecting cover 301. The components on the left side of the collecting cover 301 buffer the air pressure, and the air pressure on the right side of the collecting cover 301 rushes to the pressure relief component 2 to achieve the effect of sudden reduction of air pressure.

[0038] When the present invention is used:

[0039] First, according to the size of the insulating air chamber inside the ring network cabinet body 1 and the material of the ring network cabinet body 1, the air pressure that the insulating air chamber can withstand is determined. After the determination is made, the main adjusting handle 615 is twisted. Since the threaded rod 614 and the threaded cylinder 613 are threadedly connected, the spring seat 612 squeezes the main adjusting spring 611 while twisting the main adjusting handle 615. The elastic force of the main adjusting spring 611 is adjusted by changing the compressed length of the main adjusting spring 611, thereby realizing a large-scale adjustment of the pressure relief pressure value of the pressure relief valve 4. After completion, the secondary adjusting handle 627 is twisted. Since the threaded column 626 is threadedly connected to the threaded sleeve 625, the guide ring 624 slides while twisting the secondary adjusting handle 627, compressing the secondary adjusting spring 623, and adjusting the compressed length of the secondary adjusting spring 623, thereby realizing a small-scale adjustment of the pressure relief pressure value of the pressure relief valve 4. The main adjusting member 61 and the secondary adjusting member 62 cooperate to make the pressure relief pressure value of the pressure relief valve 4 equal to the pressure value that the insulating air chamber in the ring network cabinet body 1 can withstand;

[0040] Then, the pressure relief valve 4 is fixed on the ring main unit body 1 by matching the connector 43 with the shell 41, the pressure relief assembly 2 is installed on the inner side of the cabinet door 101, the pressure relief valve 4 and the pressure relief assembly 2 are connected by a pipeline, and the collection tank 5 is connected with the pressure relief valve 4, and the chamber formed between the collection tank 5 and the pressure relief assembly 2 and the ring main unit body 1 is made into a negative pressure state by using existing equipment, the buffer collection assembly 3 is installed inside the ring main unit body 1, and all the circuit element wiring points inside the ring main unit body 1 are set in the collection cover 301;

[0041] Next, the ring main unit body 1 is closed, and the insulating gas chamber of the ring main unit body 1 is filled with SF6 gas, and the gas pressure is the same as the gas pressure that the insulating gas chamber can withstand;

[0042] Finally, when an arc appears at the circuit connection point in the collecting cover 301, the gas near the arc suddenly increases, and the collecting cover 301 collects the increased gas pressure and impacts the left and right sides of the collecting cover 301. The components on the left side of the collecting cover 301 buffer the gas pressure, and the gas pressure on the right side of the collecting cover 301 rushes to the movable frame 203 to move the movable frame 203. The movement of the movable frame 203 drives the impact cone 204 to break the sealing cover 202. Due to the formation between the frame 201, the sealing cover 202 and the ring network cabinet body 1 The negative pressure cavity, after breaking the sealing cover 202, makes the negative pressure cavity directly connected with the interior of the ring network cabinet body 1, balances the suddenly increased air pressure, makes the suddenly increased air pressure drop suddenly, and prevents the internal components of the ring network cabinet body 1 from being damaged. At the same time, if the air pressure after the sudden drop continues to be higher than the air pressure that the ring network cabinet body 1 can withstand, the pressure relief valve 4 will release the air pressure inside the ring network cabinet body 1 again, and store the excess gas in the collection tank 5, so that the air pressure in the ring network cabinet body 1 is reduced to the air pressure range that the ring network cabinet body 1 can withstand.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pressure relief assembly, comprising a ring main unit body (1), a pressure relief assembly (2) installed inside the ring main unit body (1), and a pressure relief valve (4) installed at the left end of the ring main unit body (1), characterized in that: The pressure relief assembly (2) and the pressure relief valve (4) are connected to each other through a pipeline. The pressure relief assembly (2) comprises a rectangular frame (201). A sealing cover (202) is fixed to the left end of the frame (201). The right end of the frame (201) is fixed to the ring network cabinet body (1). The chamber formed between the frame (201), the sealing cover (202) and the ring network cabinet body (1) is a negative pressure chamber. An X-shaped movable frame (203) is provided at the left end of the sealing cover (202). Fixed rods (205) fixedly connected to the ring network cabinet body (1) are conveniently provided at the four corners of the movable frame (203). First springs (206) are respectively provided on the outer sides of the fixed rods (205). A plurality of impact cones (204) are fixed to the right end of the movable frame (203). The impact cones (204) correspond to the four corners of the sealing cover (202). The lower end of the pressure relief valve (4) is connected to a negative pressure collecting tank (5). The pressure relief valve (4) comprises a cylindrical shell (41). An end cover (42) is fixed to the left end of the shell (41). A connector (43) is fixed to the right end of the shell (41). A pressure relief regulating assembly (6) is provided inside the shell (41). The pressure relief regulating assembly (6) comprises a main regulating member (61) and a secondary regulating member (62). The lower end of the shell (41) is connected to a conduit (44). The left side of the connector (43) is in close contact with a plug (45). A sliding rod (451) is fixed to the left side of the plug (45). The left side of the sliding rod (451) is slidably connected to a sliding sleeve (452). The left side of the sliding sleeve (452) is fixed to the shell (41).

2. A pressure relief assembly according to claim 1, characterized in that: The intersection of the X-shaped movable frame (203) is disc-shaped, the sealing cover (202) is made of glass, a through hole (207) is provided at the front end of the square frame (201), and the square frame (201) is connected to the pressure relief valve (4) through the through hole (207).

3. A pressure relief assembly according to claim 1, characterized in that: The main adjusting member (61) comprises a main adjusting spring (611) sleeved on the outside of the sliding rod (451), one end of the main adjusting spring (611) is fixedly connected to the plug (45), the other end of the main adjusting spring (611) is fixedly provided with a spring seat (612) slidably connected to the sliding rod (451), the left end of the spring seat (612) is fixedly provided with a threaded cylinder (613), the left end of the threaded cylinder (613) is threadedly connected with a threaded rod (614), the threaded rod (614) is rotatably connected to the end cover (42), and the left end of the threaded rod (614) passes through the end cover (42) and is fixed with a main adjusting handle (615).

4. A pressure relief assembly according to claim 1, characterized in that: The secondary adjustment member (62) comprises a fixing ring (621) fixedly connected to the plug (45); a plurality of guide rods (622) are fixed to the left end of the fixing ring (621) along its circumference; secondary adjustment springs (623) are respectively arranged on the outer sides of the guide rods (622); the left ends of the guide rods (622) are respectively slidably connected to guide rings (624); the guide rings (624) are slidably connected to the housing (41) in the form of a slot; a threaded sleeve (625) is fixed to the left end of the guide ring (624); a threaded column (626) is threadedly connected to the left end of the threaded sleeve (625); the threaded column (626) is rotatably connected to the end cover (42); and the left end of the threaded column (626) passes through the end cover (42) and is fixed with a secondary adjustment handle (627).

5. A pressure relief assembly according to claim 3 or 4, characterized in that: The elastic coefficient of the main adjusting spring (611) is much greater than the elastic coefficient of the secondary adjusting spring (623).

6. A pressure relief assembly according to claim 1, characterized in that: The plug (45) is in a truncated cone shape and a sealing ring is fixed on the inclined surface. The connection points of the housing (41), the end cover (42) and the connector (43) are respectively provided with sealing rings.

7. A pressure relief assembly according to claim 1, characterized in that: The conduit (44) is connected to the collection tank (5) via a flange, a one-way valve is provided at the air inlet of the collection tank (5), the interior of the sliding sleeve (452) is hollow and the inner wall is symmetrically provided with convex strips, the outer wall of the sliding rod (451) is symmetrically provided with grooves, the grooves of the sliding rod (451) and the convex strips of the sliding sleeve (452) correspond to each other, and the sliding rod (451) is slidably connected to the sliding sleeve (452) via the grooves and the convex strips.

8. A ring main unit, comprising a ring main unit body (1), characterized in that: The right end of the ring main unit (1) is rotatably connected to a cabinet door (101), and a cabinet lock (102) is fixed to the right end of the cabinet door (101). A transverse plate is fixed inside the ring main unit (1) and divides the inside of the ring main unit (1) into an insulating air chamber and a display chamber. A pressure relief component (2) and a buffer collection component (3) are provided in the insulating air chamber.

9. The ring main unit according to claim 8, characterized in that: The buffer collection assembly (3) comprises a collection cover (301), the left end of the collection cover (301) is rotatably connected to one end of two sets of symmetrically arranged connecting rods (302), the other end of the connecting rod (302) is rotatably connected to a slider (305), and a fixing bar (303) is symmetrically fixed in the insulating air chamber, and the upper ends of the fixing bars (303) are symmetrically provided with rectangular through holes, and the slider (305) is slidably connected in the through holes of the fixing bar (303), and one end of a second spring (304) is fixed to the opposite side of the slider (305), and the other end of the second spring (304) is fixedly connected to the fixing bar (303).

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