Gas chamber structure of a ring main unit and its usage method

Abstract

An air chamber structure of a ring main unit and its usage method provided by the present invention belong to the technical field of ring main unit equipment, and include an electric control cabinet, a rotating door assembly, a main air chamber assembly, a guide rail, an auxiliary air chamber assembly, an electric cylinder assembly, a piston rod assembly, an impurity deposition assembly, and a gas storage tank assembly; the main air chamber assembly is located inside the electric control cabinet, the auxiliary air chamber assembly is located inside the electric control cabinet, the electric cylinder assembly is located on one side of the auxiliary air chamber assembly, the impurity deposition assembly is located at the bottom of the auxiliary air chamber assembly, the gas storage tank assembly is located outside the electric control cabinet, and the main air chamber assembly, the gas storage tank assembly, and the auxiliary air chamber assembly are all connected pairwise through pipelines. Under normal circumstances, the pressures of the gas storage tank assembly and the auxiliary air chamber assembly are both higher than the pressure of the main air chamber assembly, ensuring the stability of the pressure inside the main air chamber assembly. When an arc fault occurs inside the main air chamber assembly, the high-pressure gas inside the main air chamber assembly is quickly discharged and recycled, saving resources.

Description

Technical Field

[0001] The present invention belongs to the technical field of ring main unit equipment, and particularly relates to an air chamber structure of a ring main unit and its usage method. Background Art

[0002] A ring main unit is an important distribution equipment commonly used in the power system. It is mainly used for ring network power supply in urban distribution networks. Electrical components such as circuit breakers and power electronic switches are integrated in the ring main unit. Among them, the circuit breaker is used for line protection and isolation to ensure the safe and reliable operation of the system; the power electronic switches include power semiconductor switching devices such as metal-oxide-semiconductor field-effect transistors (MOSFETs) and insulated-gate bipolar transistors (IGBTs), which are used to realize functions such as automatic line switching and no-voltage input. The ring main unit has the advantages of simple structure, small volume, low price, and can improve power supply parameters, performance, and power supply safety. It is widely used in distribution substations and box-type substations at various power consumption load centers. When the ring main unit is in use, to prevent the risk of electrical explosion caused by electric sparks, a special air chamber is usually set inside the cabinet body, and a protective gas is filled in the air chamber to play a protective role. In the prior art, insulating gases such as SF6 are often used as insulating media in ring main units. When an arc extinguishing reaction occurs, the air pressure in the air chamber increases, and the gas in the air chamber is quickly depressurized through a pressure relief device to protect the air chamber. However, when an arc fault occurs in this kind of ring main unit with SF6 as the insulating medium, in addition to the increase in gas pressure, the arc will decompose some SF6 into active chemical substances such as F, SF4, and S2F10. The decomposed substances cannot be restored to SF6, that is, the gas after the fault cannot be recycled, and at the same time, the substances containing SF6 are directly discharged outside the cabinet, which will cause waste of resources and environmental pollution.

[0003] The authorized announcement number CN1165657470B discloses a pressure relief device for a ring main unit and the ring main unit, including a pressure relief pipe, an adjustment sleeve is sleeved on the pressure relief pipe, the adjustment sleeve is in threaded cooperation with the pressure relief pipe, a knob is installed at the end of the adjustment sleeve away from the pressure relief pipe, a pressure relief disc is slidably installed in the pressure relief pipe, a first telescopic rod is fixedly connected to the side of the pressure relief disc close to the adjustment sleeve, the end of the first telescopic rod away from the pressure relief disc is rotatably connected to the inner end face of the adjustment sleeve, an adjustment spring is sleeved on the first telescopic rod, one end of the adjustment spring abuts against the pressure relief disc, and the other end of the adjustment spring abuts against the inner end face of the adjustment sleeve. A pressure relief hole for the gas in the adjustment sleeve to flow through is opened on the adjustment sleeve, a connecting pipe for discharging the insulating gas in the ring main unit is installed on the pressure relief pipe, and a gas storage tank for storing the insulating gas is installed at the end of the connecting pipe away from the pressure relief pipe. Although the invention has the effect of ensuring the safe operation of the ring main unit, the invention does not solve the recycling of the gas in the gas storage tank, and at the same time, it does not explain how to minimize the gas loss when replacing electrical components. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the purpose of the present invention is to provide a gas chamber structure of a ring main unit and its usage method, which uses inert gas to replace the commonly used SF6 as the insulating gas, and further sets an auxiliary gas chamber component at the bottom of the main gas chamber component. When an arc fault occurs in the main gas chamber component, the air pressure rises. According to the pressure condition of the rising air pressure, the high-pressure gas in the main gas chamber component can be discharged in time and recycled, and at the same time, the solid impurities generated by the arc fault can be separated in time, effectively solving the problem that the ring main unit in the prior art often uses gases with greenhouse effects such as SF6 as the insulating medium. When an arc extinguishing reaction occurs, the air pressure in the gas chamber rises, and the gas in the gas chamber is quickly depressurized through a pressure relief device to protect the gas chamber. However, when an arc fault occurs in a ring main unit with SF6 as the insulating medium, in addition to the increase in gas pressure, the arc will cause some SF6 to decompose into active chemical substances such as F, SF4, and S2F10. The decomposed substances cannot be restored to SF6, that is, the gas after the fault cannot be recycled, and at the same time, the substances containing SF6 are directly discharged outside the cabinet, resulting in waste of resources and environmental pollution.

[0005] To achieve the above purpose, the present invention provides the following technical solutions: A gas chamber structure of a ring main unit includes an electric control cabinet and a rotating door assembly connected thereto, and further includes a main gas chamber component, a guide rail, an auxiliary gas chamber component, an electric cylinder component, a piston rod component, an impurity deposition component, and a gas storage tank component; the main gas chamber component is located inside the electric control cabinet and is fixedly connected thereto; the guide rail is located inside the main gas chamber component and is fixedly connected thereto; the auxiliary gas chamber component is located inside the electric control cabinet and is fixedly connected thereto, and the auxiliary gas chamber component is located at the bottom of the main gas chamber component; the electric cylinder component is located on one side of the auxiliary gas chamber component and is fixedly connected thereto; the impurity deposition component is located at the bottom of the auxiliary gas chamber component and is fixedly connected thereto; the gas storage tank component is located outside the electric control cabinet, the main gas chamber component is connected to the gas storage tank component through a pipeline, the auxiliary gas chamber component is connected to the gas storage tank component through a pipeline, and the main gas chamber component is connected to the auxiliary gas chamber component.

[0006] Preferably, the electric control cabinet includes a cabinet body, a dashboard, a main gas chamber support seat component, an auxiliary gas chamber support seat component, and support feet. The four support feet are located at the bottom of the cabinet body to support it. The dashboard is connected to the cabinet body. The main gas chamber support seat component is located inside the cabinet body and is fixedly connected thereto. The auxiliary gas chamber support seat component is located inside the cabinet body and is fixedly connected thereto. The side of the cabinet body away from the electric cylinder component is provided with a first through hole, a second through hole, and a third through hole. The side of the cabinet body close to the electric cylinder component is provided with a fourth through hole and an electric cylinder installation port. A deposition port is opened on the bottom plate of the cabinet body.

[0007] Preferably, the main air chamber assembly includes a main air chamber housing, a first sealing gasket, a second sealing gasket, a sealing cover plate assembly, a first intake pipe for the auxiliary air chamber, and a second intake pipe for the auxiliary air chamber. The main air chamber housing is a rectangular parallelepiped box body. The first intake pipe for the auxiliary air chamber and the second intake pipe for the auxiliary air chamber both penetrate the bottom plate of the main air chamber housing and extend into the interior of the auxiliary air chamber assembly. A first one-way valve is provided on the first intake pipe for the auxiliary air chamber, and a second one-way valve is provided on the second intake pipe for the auxiliary air chamber.

[0008] Preferably, a first groove is provided on the front surface of the main air chamber housing. The first sealing gasket and the second sealing gasket are both fixedly connected to the front surface of the main air chamber housing. The inner circumference of the first groove is the first sealing gasket, and the outer circumference of the first groove is the second sealing gasket. A main air chamber air inlet and a negative pressure air inlet are provided on the side of the main air chamber housing away from the electric cylinder assembly. A first stop valve is provided on the connecting pipe of the negative pressure air inlet. An emergency pressure relief port is provided on the side of the main air chamber housing close to the electric cylinder assembly. The sealing cover plate assembly includes a cover plate and a handle. The handle is located on the front surface of the cover plate and is fixedly connected thereto. A first boss and a second boss are provided on the back surface of the cover plate. A second groove is formed between the first boss and the second boss.

[0009] Preferably, the auxiliary air chamber assembly includes a U-shaped plate, a connecting plate, a first end cover plate assembly, and a second end cover plate assembly. The U-shaped plate is fixedly connected to the connecting plate to form an auxiliary air chamber housing. The first end cover plate assembly and the second end cover plate assembly are both connected to the auxiliary air chamber housing.

[0010] Preferably, an auxiliary air chamber air inlet is provided at the top of the U-shaped plate. A third groove is provided at the bottom of the U-shaped plate. The third groove communicates with the impurity deposition assembly. An auxiliary air chamber first exhaust port is provided on the first end cover plate assembly. An auxiliary air chamber second exhaust port and an electric cylinder extension shaft mounting hole are provided on the second end cover plate assembly. A second stop valve is provided on the discharge pipe of the impurity deposition assembly.

[0011] Preferably, the piston rod assembly includes a piston, a first connecting rod assembly, a second connecting rod assembly, a first exhaust pipe and a second exhaust pipe. One end of the piston is fixedly connected to the first connecting rod assembly, and the other end of the piston is fixedly connected to the second connecting rod assembly. The first connecting rod assembly includes a first connecting rod and a connecting disc. A fifth through hole is provided on the first connecting rod. A positioning boss is provided at one end of the connecting disc close to the piston. The first exhaust pipe penetrates through the first end cover assembly, and a third one-way valve is provided on the first exhaust pipe. The second exhaust pipe penetrates through the second end cover assembly, and a fourth one-way valve is provided on the second exhaust pipe. The piston divides the auxiliary air chamber assembly into two chambers. The chamber close to the first end cover assembly is the first chamber, and the chamber close to the second end cover assembly is the second chamber.

[0012] Preferably, the gas storage tank assembly includes a gas storage tank, an inflation pipe, an emergency pressure relief pipe and a pressure boosting and summarizing pipe. The inside of the gas storage tank is filled with pressurized inert gas. A third stop valve and a pressure gauge are provided on the inflation pipe. A fifth one-way valve is provided on the emergency pressure relief pipe. The first exhaust pipe and the second exhaust pipe are both communicated with the pressure boosting and summarizing pipe.

[0013] Preferably, when the structure is in a normal working state, the following relationship exists among the air pressure P1 of the gas storage tank assembly, the air pressure P2 of the main air chamber assembly and the air pressure P3 of the auxiliary air chamber assembly: P1 > P3 > P2.

[0014] The present invention also provides a use method for the air chamber structure of a ring main unit. The use method includes a normal working inflation method S1 and a failure cleaning method S2;

[0015] Among them, the normal working inflation method S1 includes the following steps:

[0016] S11, make the piston located at the center of the auxiliary air chamber assembly, evacuate the first chamber and the second chamber, and then inject inert gas into the auxiliary air chamber assembly through the gas storage tank assembly;

[0017] S12, stop gas injection, open the first stop valve, evacuate the main air chamber assembly and then close the valve;

[0018] S13, open the third stop valve, and inject inert gas into the main air chamber assembly through the inflation pipe;

[0019] Among them, the failure cleaning method S2 includes the following steps:

[0020] S21. When the arc extinguishing reaction occurs, the pressure of the inert gas in the main gas chamber assembly rises. At this time, there are corresponding changes according to the magnitude of its air pressure. If the air pressure in the main gas chamber assembly is greater than that in the gas storage tank assembly, all one-way valves are opened, and the gas in the main gas chamber assembly rapidly releases pressure to the gas storage tank assembly through the emergency pressure relief pipeline, the first exhaust pipeline, and the second exhaust pipeline. After the pressure is balanced, each one-way valve is in a closed state; if the air pressure in the main gas chamber assembly is greater than that in the auxiliary gas chamber assembly and less than that in the gas storage tank assembly, only the first one-way valve and the second one-way valve are in an open state. After the pressure is balanced, each one-way valve is in a closed state; if the air pressure in the main gas chamber assembly is still less than that in the auxiliary gas chamber assembly, all one-way valves are in a closed state at this time;

[0021] S22. Start the electric cylinder assembly to make it contract. At this time, the volume of the second chamber becomes smaller, the air pressure rises, and the gas is pressurized and enters the gas storage tank assembly through the second exhaust pipeline. At the same time, the volume of the first chamber becomes larger, the air pressure drops, and the gas in the main gas chamber assembly enters the first chamber through the first intake pipe of the auxiliary gas chamber, and the gas pressure in the main gas chamber assembly drops;

[0022] S23. When the electric cylinder assembly changes direction, at this time, the volume of the first chamber becomes smaller, the air pressure rises, and the gas is pressurized and enters the gas storage tank assembly through the first exhaust pipeline. At the same time, the volume of the second chamber becomes larger, the air pressure drops, and the gas in the main gas chamber assembly enters the second chamber through the second intake pipe of the auxiliary gas chamber, and the gas pressure in the main gas chamber assembly drops;

[0023] S24. When the electric cylinder assembly changes direction again, repeat the steps of S22 and S23 above;

[0024] S25. When the pressure difference of the gas in the auxiliary gas chamber assembly is lower than the opening pressure of its corresponding one-way valve after being pressurized, reset the electric cylinder assembly and stop its operation;

[0025] S26. Open the second stop valve on the two impurity deposition assemblies. After the solid impurities are discharged, close the valve. At the same time, separate the seal cover assembly from the main gas chamber housing, replace the damaged electrical appliances, and remove the impurities inside;

[0026] S27. After fixedly connecting the seal cover assembly to the main gas chamber housing, inflate it according to the normal working inflation method S1.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] (1)The gas chamber structure of the ring main unit provided by the present invention, through the settings of the electric control cabinet, the main gas chamber assembly, the guide rail, the auxiliary gas chamber assembly, the electric cylinder assembly, the piston rod assembly, the impurity deposition assembly and the gas storage tank assembly, when an arc fault occurs in the main gas chamber assembly, the high-pressure gas in the main gas chamber assembly can be quickly discharged. In extremely harsh conditions, the high-pressure gas in the main gas chamber assembly can be discharged to the gas storage tank assembly simultaneously through the emergency pressure relief pipeline, the first exhaust pipeline and the second exhaust pipeline, ensuring the safety of the main gas chamber assembly.

[0029] (2)The gas chamber structure of the ring main unit provided by the present invention, under normal circumstances, the pressures of the gas storage tank assembly externally connected to the main gas chamber assembly and the auxiliary gas chamber assembly are both higher than the pressure of the main gas chamber assembly, ensuring the stability of the pressure in the main gas chamber assembly.

[0030] (3)The gas chamber structure of the ring main unit provided by the present invention, a filter screen is provided on the auxiliary gas chamber inlet pipe, and a fifth through hole is opened on the piston rod assembly. The area where the fifth through hole is located is a minor arc and the fifth through hole faces the bottom of the auxiliary gas chamber assembly, minimizing the inflow of solid impurities into the gas storage tank assembly along with the circulating gas.

[0031] (4)The gas chamber structure of the ring main unit provided by the present invention, when an arc fault occurs in the main gas chamber assembly, the inert gas in the auxiliary gas chamber assembly is pressurized and transported to the gas storage tank assembly through the expansion and contraction of the electric cylinder assembly, and at the same time, the inert gas in the main gas chamber assembly is transported into the auxiliary gas chamber assembly. Only when the pressure difference of the gas in the auxiliary gas chamber assembly is lower than the opening pressure of its corresponding one-way valve after being pressurized, the inert gas in the auxiliary gas chamber assembly and the main gas chamber assembly is discharged, enabling the electrical appliances to be replaced or repaired in a timely manner and facilitating impurity cleaning. Description of the Drawings

[0032] Figure 1 is the overall structural schematic diagram of the present invention;

[0033] Figure 2 is the structural schematic diagram of the cabinet body of the present invention;

[0034] Figure 3 is the structural schematic diagram of the main gas chamber assembly of the present invention;

[0035] Figure 4 is the structural schematic diagram of the sealing cover plate assembly of the present invention;

[0036] Figure 5 is the structural schematic diagram of the auxiliary gas chamber assembly of the present invention;

[0037] Figure 6 is the structural schematic diagram of the U-shaped plate of the present invention;

[0038] Figure 7It is a schematic structural diagram of the first end cover plate assembly of the present invention;

[0039] Figure 8 It is a schematic structural diagram of the second end cover plate assembly of the present invention;

[0040] Figure 9 It is a schematic structural diagram of the first connecting rod assembly of the present invention;

[0041] Figure 10 It is a schematic diagram of air intake and exhaust when the first chamber of the present invention is compressed;

[0042] Figure 11 It is a schematic diagram of air intake and exhaust when the second chamber of the present invention is compressed.

[0043] In the figure: 100, electric control cabinet; 110, cabinet body; 111, first through hole; 112, second through hole; 113, third through hole; 114, fourth through hole; 115, electric cylinder mounting port; 116, deposition port; 120, instrument panel; 130, main air chamber support seat assembly; 140, auxiliary air chamber support seat assembly; 150, support feet; 200, rotating door assembly; 300, main air chamber assembly; 310, main air chamber housing; 311, first groove; 312, main air chamber air inlet; 313, negative pressure air inlet; 314, emergency pressure relief port; 315, first stop valve; 320, first sealing gasket; 330, second sealing gasket; 340, sealing cover plate assembly; 341, cover plate; 342, handle; 343, first boss; 344, second boss; 345, second groove; 350, auxiliary air chamber first intake pipe; 351, first one-way valve; 352, filter screen; 360, auxiliary air chamber second intake pipe; 361, second one-way valve; 400, guide rail; 500, auxiliary air chamber assembly; 510, U-shaped plate; 511, auxiliary air chamber air inlet; 512, third groove; 520, connecting plate; 530, first end cover plate assembly; 531, auxiliary air chamber first exhaust port; 540, second end cover plate assembly; 541, auxiliary air chamber second exhaust port; 542, electric cylinder extension shaft mounting hole; 600, electric cylinder assembly; 700, piston rod assembly; 710, piston; 720, first connecting rod assembly; 721, first connecting rod; 722, fifth through hole; 723, connecting disc; 724, positioning boss; 730, second connecting rod assembly; 740, first exhaust pipe; 741, third one-way valve; 750, second exhaust pipe; 751, fourth one-way valve; 800, impurity deposition assembly; 801, second stop valve; 900, gas storage tank assembly; 910, gas storage tank; 920, inflation pipe; 921, third stop valve; 922, pressure gauge; 930, emergency pressure relief pipe; 931, fifth one-way valve; 940, supercharging summary pipe. Detailed implementation manners

[0044] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0045] It should be noted that the terms "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", etc. indicating orientation or positional relationships are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present invention.

[0046] It should be understood that in the description of the invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. Embodiment

[0047] See the attached Figures 1 to 11 As shown in the figure, a gas chamber structure of a ring main unit provided in this embodiment includes an electric control cabinet 100, a rotating door assembly 200 connected thereto, a main gas chamber assembly 300, a guide rail 400, an auxiliary gas chamber assembly 500, an electric cylinder assembly 600, a piston rod assembly 700, an impurity deposition assembly 800, and a gas storage tank assembly 900.

[0048] The electric control cabinet 100 includes a cabinet body 110, an instrument panel 120, a main gas chamber support seat assembly 130, an auxiliary gas chamber support seat assembly 140, and support feet 150. The four support feet 150 are located at the bottom of the cabinet body 110 to support it. The instrument panel 120 is connected to the cabinet body 110. The main gas chamber support seat assembly 130 is located inside the cabinet body 110 and fixedly connected thereto. The auxiliary gas chamber support seat assembly 140 is located inside the cabinet body 110 and fixedly connected thereto. The main gas chamber support seat assembly 130 is located on the top of the auxiliary gas chamber support seat assembly 140. A first through hole 111, a second through hole 112, and a third through hole 113 are provided on one side of the cabinet body 110 away from the electric cylinder assembly 600. The third through hole 113 is located at the bottom of the first through hole 111 and the second through hole 112. A fourth through hole 114 and an electric cylinder installation port 115 are provided on one side of the cabinet body 110 close to the electric cylinder assembly 600. The electric cylinder installation port 115 is located at the bottom of the fourth through hole 114. A deposition port 116 is opened on the bottom plate of the cabinet body 110.

[0049] The main air chamber assembly 300 is located inside the electric control cabinet 100 and fixedly connected thereto; the main air chamber assembly 300 includes a main air chamber housing 310, a first sealing gasket 320, a second sealing gasket 330, a sealing cover plate assembly 340, a first auxiliary air chamber intake pipe 350, and a second auxiliary air chamber intake pipe 360. The main air chamber housing 310 is a five-sided closed rectangular box. The first auxiliary air chamber intake pipe 350 and the second auxiliary air chamber intake pipe 360 both penetrate the bottom plate of the main air chamber housing 310 and extend into the interior of the auxiliary air chamber assembly 500. A first one-way valve 351 is provided on the first auxiliary air chamber intake pipe 350, and a second one-way valve 361 is provided on the second auxiliary air chamber intake pipe 360.

[0050] A first groove 311 is provided on the front surface of the main air chamber housing 310. The first sealing gasket 320 and the second sealing gasket 330 are both fixedly connected to the front surface of the main air chamber housing 310. The inner circumference of the first groove 311 is the first sealing gasket 320, and the outer circumference of the first groove 311 is the second sealing gasket 330. A main air chamber air inlet 312 and a negative pressure air inlet 313 are provided on the side of the main air chamber housing 310 away from the electric cylinder assembly 600. A first stop valve 315 is provided on the connecting pipe of the negative pressure air inlet 313, and the negative pressure air inlet 313 is connected to an external vacuum pump. An emergency pressure relief port 314 is provided on the side of the main air chamber housing 310 close to the electric cylinder assembly 600. The sealing cover plate assembly 340 includes a cover plate 341 and a handle 342. The handle 342 is located on the front surface of the cover plate 341 and fixedly connected thereto. A first boss 343 and a second boss 344 are provided on the back surface of the cover plate 341. A second groove 345 is formed between the first boss 343 and the second boss 344. When the sealing cover plate assembly 340 and the main air chamber housing 310 are fixed, the first boss 343 is engaged with the first groove 311, the second boss 344 is engaged with the inner wall of the front surface of the main air chamber housing 310, the second groove 345 abuts against the first sealing gasket 320, and the outer circumference of the first boss 343 abuts against the second sealing gasket 330.

[0051] The guide rail 400 is located inside the main air chamber assembly 300 and fixedly connected thereto. Electrical components can be installed in the main air chamber assembly 300 through the guide rail 400. The connection between the electrical components and the corresponding instruments on the instrument panel belongs to existing mature technologies and will not be elaborated here.

[0052] The auxiliary air chamber assembly 500 is located inside the electric control cabinet 100 and fixedly connected thereto. The auxiliary air chamber assembly 500 is located at the bottom of the main air chamber assembly 300; the auxiliary air chamber assembly 500 includes a U-shaped plate 510, a connecting plate 520, a first end cover plate assembly 530, and a second end cover plate assembly 540. The U-shaped plate 510 is fixedly connected to the connecting plate 520 to form an auxiliary air chamber housing, and both the first end cover plate assembly 530 and the second end cover plate assembly 540 are connected to the auxiliary air chamber housing.

[0053] An auxiliary air chamber air inlet 511 is provided at the top of the U-shaped plate 510, and a third groove 512 is provided at the bottom of the U-shaped plate 510. The third groove 512 communicates with the impurity deposition assembly 800. Both the first end cover plate assembly 530 and the second end cover plate assembly 540 include an end cover plate and a guide cylinder. An auxiliary air chamber first exhaust port 531 is provided on the first end cover plate assembly 530, and an auxiliary air chamber second exhaust port 541 and an electric cylinder extension shaft mounting hole 542 are provided on the second end cover plate assembly 540. A second stop valve 801 is provided on the discharge pipe of the impurity deposition assembly 800.

[0054] The electric cylinder assembly 600 is located on one side of the auxiliary air chamber assembly 500 and is fixedly connected thereto.

[0055] The piston rod assembly 700 includes a piston 710, a first connecting rod assembly 720, a second connecting rod assembly 730, a first exhaust pipe 740, and a second exhaust pipe 750. One end of the piston 710 is fixedly connected to the first connecting rod assembly 720, and the other end of the piston 710 is fixedly connected to the second connecting rod assembly 730. The second connecting rod assembly 730 is fixedly connected to the extension shaft of the electric cylinder assembly 600. The first connecting rod assembly 720 includes a first connecting rod 721 and a connecting disk 723. A fifth through hole 722 is provided on the first connecting rod 721, and the through hole area where the fifth through hole 722 is located is a minor arc area. A positioning boss 724 is provided at one end of the connecting disk 723 close to the piston 710. The second connecting rod assembly 730 has basically the same structure as the first connecting rod assembly 720, except that an internal thread hole is provided at one end of the second connecting rod assembly 730 close to the electric cylinder assembly 600, and an external thread is provided at the outermost end of the extension shaft of the electric cylinder assembly 600. The first exhaust pipe 740 penetrates through the first end cover plate assembly 530, and a third one-way valve 741 is provided on the first exhaust pipe 740. The second exhaust pipe 750 penetrates through the second end cover plate assembly 540, and a fourth one-way valve 751 is provided on the second exhaust pipe 750. The piston 710 divides the auxiliary air chamber assembly 500 into two chambers. The chamber close to the first end cover plate assembly 530 is the first chamber, and the chamber close to the second end cover plate assembly 540 is the second chamber.

[0056] The impurity deposition assembly 800 is located at the bottom of the auxiliary air chamber assembly 500 and is fixedly connected thereto; the gas storage tank assembly 900 is located outside the electric control cabinet 100. The main air chamber assembly 300 is connected to the gas storage tank assembly 900 through a pipeline. The auxiliary air chamber assembly 500 is connected to the gas storage tank assembly 900 through a pipeline. The main air chamber assembly 300 is connected to the auxiliary air chamber assembly 500.

[0057] The gas storage tank assembly 900 includes a gas storage tank 910, an inflation pipeline 920, an emergency pressure relief pipeline 930, and a supercharging summary pipeline 940. The inside of the gas storage tank 910 is filled with pressurized inert gas, usually argon. The gas storage tank 910 is fixedly connected to the foundation through supports (not shown in the figure). When the main gas chamber assembly 300 is in a vacuum state, the main gas chamber assembly 300 is filled with gas through the inflation pipeline 920 to a preset air pressure, which plays a protective role for the electrical components of the main gas chamber assembly 300. A third stop valve 921 and a pressure gauge 922 are provided on the inflation pipeline 920. A fifth one-way valve 931 is provided on the emergency pressure relief pipeline 930. The first exhaust pipeline 740 and the second exhaust pipeline 750 are both connected to the supercharging summary pipeline 940.

[0058] It is not difficult to understand that the position of the first through hole 111 corresponds to the position of the negative pressure air inlet 313, the position of the second through hole 112 corresponds to the position of the main gas chamber air inlet 312, the position of the third through hole 113 corresponds to the position of the first exhaust port 531 of the auxiliary gas chamber, the position of the fourth through hole 114 corresponds to the position of the emergency pressure relief port 314, the position of the electric cylinder mounting port 115 corresponds to the mounting flange position of the electric cylinder assembly 600, and the positions of the two deposition ports 116 correspond to the position of the impurity deposition assembly 800.

[0059] When this structure is in a normal working state, the air pressures P1 of the gas storage tank assembly 900, P2 of the main gas chamber assembly 300, and P3 of the auxiliary gas chamber assembly 500 have the following relationship: P1 > P3 > P2.

[0060] It should be noted that regardless of the state of the piston 710, vacuum interfaces (not shown in the figure) are provided in both the first chamber and the second chamber of the auxiliary air chamber assembly 500. The auxiliary air chamber assembly 500 can be evacuated through the vacuum interfaces. At the same time, pipelines (not shown in the figure) and stop valves (not shown in the figure) connected to the gas storage tank 910 are provided in both the first chamber and the second chamber of the auxiliary air chamber assembly 500. Inert gas can be filled into the auxiliary air chamber assembly 500 through the corresponding pipelines from the gas storage tank assembly 900 to make its pressure P3. When an arc extinguishing reaction occurs, the pressure of the inert gas in the main air chamber assembly 300 rises. At this time, according to the magnitude of its air pressure, there are three corresponding situations. First, if the air pressure in the main air chamber assembly 300 is greater than the air pressure in the gas storage tank assembly 900, all one-way valves are opened, and the gas in the main air chamber assembly 300 quickly releases pressure to the gas storage tank assembly 900 through the emergency pressure relief pipeline 930, the first exhaust pipeline 740, and the second exhaust pipeline 750. After the pressure is balanced, each one-way valve is in a closed state. Second, if the air pressure in the main air chamber assembly 300 is greater than the air pressure in the auxiliary air chamber assembly 500 and less than the air pressure in the gas storage tank assembly 900, only the first one-way valve 351 and the second one-way valve 361 are in an open state. After the pressure is balanced, each one-way valve is in a closed state. Third, if the air pressure in the main air chamber assembly 300 is still less than the air pressure in the auxiliary air chamber assembly 500, all one-way valves are in a closed state at this time.

[0061] The present invention also provides a usage method for the air chamber structure of a ring main unit. The usage method includes a normal working gas filling method S1 and a fault cleaning method S2;

[0062] Among them, the normal working gas filling method S1 includes the following steps:

[0063] S11, make the piston 710 located at the center of the auxiliary air chamber assembly 500, evacuate the first chamber and the second chamber, and then inject inert gas into the auxiliary air chamber assembly 500 through the gas storage tank assembly 900;

[0064] S12, stop gas injection, open the first stop valve 315, evacuate the main air chamber assembly 300 and then close the valve;

[0065] S13, open the third stop valve 921, and inject inert gas into the main air chamber assembly 300 through the gas filling pipeline 920;

[0066] Among them, the fault cleaning method S2 includes the following steps:

[0067] S21. When an arc extinguishing reaction occurs, the pressure of the inert gas in the main gas chamber assembly 300 rises, and there are corresponding changes according to the magnitude of its air pressure. If the air pressure in the main gas chamber assembly 300 is greater than that in the gas storage tank assembly 900, all one-way valves open, and the gas in the main gas chamber assembly 300 rapidly releases pressure to the gas storage tank assembly 900 through the emergency pressure relief pipeline 930, the first exhaust pipeline 740, and the second exhaust pipeline 750. After the pressure is balanced, each one-way valve is in a closed state; if the air pressure in the main gas chamber assembly 300 is greater than that in the auxiliary gas chamber assembly 500 and less than that in the gas storage tank assembly 900, only the first one-way valve 351 and the second one-way valve 361 are in an open state, and after the pressure is balanced, each one-way valve is in a closed state; if the air pressure in the main gas chamber assembly 300 is still less than that in the auxiliary gas chamber assembly 500, all one-way valves are in a closed state at this time;

[0068] S22. Start the electric cylinder assembly 600 to contract it. At this time, the volume of the second chamber becomes smaller, the air pressure rises, and after the gas is pressurized, it enters the gas storage tank assembly 900 through the second exhaust pipeline 750. At the same time, the volume of the first chamber becomes larger, the air pressure drops, and the gas in the main gas chamber assembly 300 enters the first chamber through the first intake pipe 350 of the auxiliary gas chamber, and the gas pressure in the main gas chamber assembly 300 drops;

[0069] S23. When the electric cylinder assembly 600 changes its direction, at this time, the volume of the first chamber becomes smaller, the air pressure rises, and after the gas is pressurized, it enters the gas storage tank assembly 900 through the first exhaust pipeline 740. At the same time, the volume of the second chamber becomes larger, the air pressure drops, and the gas in the main gas chamber assembly 300 enters the second chamber through the second intake pipe 360 of the auxiliary gas chamber, and the gas pressure in the main gas chamber assembly 300 drops;

[0070] S24. When the electric cylinder assembly 600 changes its direction again, repeat the steps of S22 and S23 above;

[0071] S25. When the pressure difference of the gas in the auxiliary gas chamber assembly 500 is lower than the opening pressure of its corresponding one-way valve after being pressurized, reset the electric cylinder assembly 600 and stop its operation;

[0072] S26. Open the second stop valve 801 on the two impurity deposition assemblies 800. After the solid impurities are discharged, close the valve. At the same time, separate the sealing cover assembly 340 from the main gas chamber housing 310, replace the damaged electrical appliances, and remove the impurities inside;

[0073] S27. After fixedly connecting the sealing cover assembly 340 to the main gas chamber housing 310, inflate it according to the normal working inflation method S1.

[0074] It should be noted that there may be multiple ring main units on site. Each ring main unit is provided with a main gas chamber assembly 300 and an auxiliary gas chamber assembly 500. However, only one general gas storage tank 910 is needed on site. Only pipelines need to be added to ensure that the pipelines corresponding to the gas storage tank 910 are connected to the ring main unit.

[0075] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An air chamber structure of a ring main unit, comprising an electric control cabinet (100) and a rotating door assembly (200) connected thereto, characterized in that: It also includes a main air chamber assembly (300), a guide rail (400), an auxiliary air chamber assembly (500), an electric cylinder assembly (600), a piston rod assembly (700), an impurity deposition assembly (800) and an air storage tank assembly (900); The main air chamber component (300) is located inside the electric control cabinet (100) and is fixedly connected thereto; The guide rail (400) is located inside the main air chamber assembly (300) and is fixedly connected thereto; The auxiliary air chamber assembly (500) is located inside the electric control cabinet (100) and is fixedly connected thereto, and the auxiliary air chamber assembly (500) is located at the bottom of the main air chamber assembly (300); The electric cylinder assembly (600) is located on one side of the auxiliary air chamber assembly (500) and is fixedly connected thereto; The impurity deposition component (800) is located at the bottom of the auxiliary air chamber component (500) and is fixedly connected thereto; The gas storage tank assembly (900) is located outside the electric control cabinet (100), the main gas chamber assembly (300) is connected to the gas storage tank assembly (900) via a pipeline, the auxiliary gas chamber assembly (500) is connected to the gas storage tank assembly (900) via a pipeline, and the main gas chamber assembly (300) is connected to the auxiliary gas chamber assembly (500); The piston rod assembly (700) comprises a piston (710), a first connecting rod assembly (720), a second connecting rod assembly (730), a first exhaust pipe (740) and a second exhaust pipe (750); one end of the piston (710) is fixedly connected to the first connecting rod assembly (720), the other end of the piston (710) is fixedly connected to the second connecting rod assembly (730), the second connecting rod assembly (730) is fixedly connected to the extension shaft of the electric cylinder assembly (600), a third one-way valve (741) is provided on the first exhaust pipe (740), a fourth one-way valve (751) is provided on the second exhaust pipe (750), and the piston (710) divides the auxiliary air chamber assembly (500) into two chambers; the first exhaust pipe (740) and the second exhaust pipe (750) are both connected to the air storage tank assembly (900).

2. The air chamber structure of the ring main unit according to claim 1 is characterized in that: The electric control cabinet (100) comprises a cabinet body (110), an instrument panel (120), a main air chamber support seat assembly (130), an auxiliary air chamber support seat assembly (140) and support legs (150), wherein the four support legs (150) are located at the bottom of the cabinet body (110) to support the cabinet body, the instrument panel (120) is connected to the cabinet body (110), the main air chamber support seat assembly (130) is located inside the cabinet body (110) and is fixedly connected thereto, and the auxiliary air chamber support seat assembly (140) is located inside the cabinet body (110) and is fixedly connected thereto. The support seat assembly (140) is located inside the cabinet (110) and is fixedly connected thereto; a first through hole (111), a second through hole (112), and a third through hole (113) are provided on a side of the cabinet (110) away from the electric cylinder assembly (600); a fourth through hole (114) and an electric cylinder installation port (115) are provided on a side of the cabinet (110) close to the electric cylinder assembly (600); and a deposition port (116) is provided on the bottom plate of the cabinet (110).

3. The air chamber structure of the ring main unit according to claim 1 is characterized in that: The main air chamber assembly (300) comprises a main air chamber shell (310), a first sealing gasket (320), a second sealing gasket (330), a sealing cover plate assembly (340), a first air inlet pipe (350) of an auxiliary air chamber, and a second air inlet pipe (360) of an auxiliary air chamber. The main air chamber shell (310) is a rectangular box body. The first air inlet pipe (350) of the auxiliary air chamber and the second air inlet pipe (360) of the auxiliary air chamber both penetrate the bottom plate of the main air chamber shell (310) and extend into the interior of the auxiliary air chamber assembly (500). The first air inlet pipe (350) of the auxiliary air chamber is provided with a first one-way valve (351), and the second air inlet pipe (360) of the auxiliary air chamber is provided with a second one-way valve (361).

4. The air chamber structure of the ring main unit according to claim 3 is characterized in that: The front side of the main air chamber housing (310) is provided with a first groove (311); the first sealing gasket (320) and the second sealing gasket (330) are both fixedly connected to the front side of the main air chamber housing (310); the inner periphery of the first groove (311) is the first sealing gasket (320); the outer periphery of the first groove (311) is the second sealing gasket (330); a main air chamber air inlet (312) and a negative pressure air inlet (313) are provided on a side of the main air chamber housing (310) away from the electric cylinder assembly (600); the negative pressure air inlet (313) is provided on the inner side of the main air chamber housing (310); 13) is provided with a first stop valve (315), a side of the main air chamber housing (310) close to the electric cylinder assembly (600) is provided with an emergency pressure relief port (314), the sealing cover plate assembly (340) comprises a cover plate (341) and a handle (342), the handle (342) is located on the front side of the cover plate (341) and is fixedly connected thereto, a first boss (343) and a second boss (344) are provided on the back side of the cover plate (341), and a second groove (345) is formed between the first boss (343) and the second boss (344).

5. The air chamber structure of the ring main unit according to claim 4 is characterized in that: The auxiliary air chamber assembly (500) comprises a U-shaped plate (510), a connecting plate (520), a first end cover plate assembly (530) and a second end cover plate assembly (540); the U-shaped plate (510) and the connecting plate (520) are fixedly connected to form an auxiliary air chamber shell; the first end cover plate assembly (530) and the second end cover plate assembly (540) are both connected to the auxiliary air chamber shell.

6. The air chamber structure of the ring main unit according to claim 5, characterized in that: An auxiliary air chamber air inlet (511) is provided at the top of the U-shaped plate (510), a third groove (512) is provided at the bottom of the U-shaped plate (510), the third groove (512) is connected to the impurity deposition assembly (800), an auxiliary air chamber first exhaust port (531) is provided on the first end cover plate assembly (530), an auxiliary air chamber second exhaust port (541) and an electric cylinder extension shaft mounting hole (542) are provided on the second end cover plate assembly (540), and a second stop valve (801) is provided on the discharge pipe of the impurity deposition assembly (800).

7. The air chamber structure of the ring main unit according to claim 5, characterized in that: The first connecting rod assembly (720) comprises a first connecting rod (721) and a connecting plate (723), the first connecting rod (721) being provided with a fifth through hole (722), the connecting plate (723) being provided with a positioning boss (724) at one end close to the piston (710), the first exhaust pipe (740) passing through the first end cover plate assembly (530), the second exhaust pipe (750) passing through the second end cover plate assembly (540), the chamber close to the first end cover plate assembly (530) being the first chamber, and the chamber close to the second end cover plate assembly (540) being the second chamber.

8. The air chamber structure of the ring main unit according to claim 7, characterized in that: The gas storage tank assembly (900) comprises a gas storage tank (910), a gas charging pipe (920), an emergency pressure relief pipe (930) and a pressurized collecting pipe (940); the gas storage tank (910) contains pressurized inert gas; the gas charging pipe (920) is provided with a third stop valve (921) and a pressure gauge (922); during inflation, the inert gas in the gas storage tank (910) is injected into the main gas chamber assembly (300) through the gas charging pipe (920); the emergency pressure relief pipe (930) is provided with a fifth check valve (931); the first exhaust pipe (740) is provided with a pressure relief pipe (932); and the gas charging pipe (920) is provided with a pressure relief pipe (932). The second exhaust pipe (750) is connected to the pressurized collecting pipe (940), and the pressurized collecting pipe (940) is connected to the gas storage tank (910). When an arc extinguishing reaction occurs, the pressure of the inert gas in the main air chamber assembly (300) rises. At this time, if the air pressure of the main air chamber assembly (300) is greater than the air pressure of the gas storage tank assembly (900), all the one-way valves are opened, and the gas in the main air chamber assembly (300) is quickly depressurized to the gas storage tank (910) through the emergency pressure relief pipe (930), the first exhaust pipe (740) and the second exhaust pipe (750) at the same time.

9. The air chamber structure of the ring main unit according to claim 8, characterized in that: When the structure is in a normal working state, the air pressure P1 of the air storage tank assembly (900), the air pressure P2 of the main air chamber assembly (300) and the air pressure P3 of the auxiliary air chamber assembly (500) have the following relationship: P1>P3>P2.

10. The method for using the air chamber structure of the ring main unit according to claim 8 or 9, characterized in that: The method of use includes a normal working inflation method S1 and a fault cleaning method S2; The normal working inflation method S1 includes the following steps: S11, positioning the piston (710) at the center of the auxiliary air chamber assembly (500), evacuating the first chamber and the second chamber, and then injecting inert gas into the auxiliary air chamber assembly (500) through the gas storage tank assembly (900); S12, stop gas injection, open the first stop valve (315), evacuate the main gas chamber assembly (300), and then close the valve; S13, opening the third stop valve (921) and injecting inert gas into the main air chamber assembly (300) through the inflation pipe (920); The fault cleaning method S2 includes the following steps: S21, when an arc extinguishing reaction occurs, the pressure of the inert gas in the main gas chamber assembly (300) rises. At this time, the pressure changes accordingly according to the size of the gas pressure. If the gas pressure in the main gas chamber assembly (300) is greater than the gas pressure in the gas storage tank assembly (900), all the one-way valves are opened, and the gas in the main gas chamber assembly (300) is quickly depressurized to the gas storage tank assembly (900) through the emergency pressure relief pipe (930), the first exhaust pipe (740) and the second exhaust pipe (750). After the forces are balanced, each one-way valve is in a closed state; if the air pressure of the main air chamber assembly (300) is greater than the air pressure of the auxiliary air chamber assembly (500) and less than the air pressure of the air storage tank assembly (900), only the first one-way valve (351) and the second one-way valve (361) are in an open state, and after the pressure is balanced, each one-way valve is in a closed state; if the air pressure of the main air chamber assembly (300) is still less than the air pressure of the auxiliary air chamber assembly (500), at this time, all the one-way valves are in a closed state; S22, starting the electric cylinder assembly (600) to shrink it, at which time the volume of the second chamber decreases, the air pressure increases, and the pressurized gas enters the air storage tank assembly (900) through the second exhaust pipe (750). At the same time, the volume of the first chamber increases, the air pressure decreases, and the gas in the main air chamber assembly (300) enters the first chamber through the auxiliary air chamber first air inlet pipe (350), and the gas pressure in the main air chamber assembly (300) decreases; S23, when the electric cylinder assembly (600) is reversed, the volume of the first chamber decreases, the air pressure increases, and the pressurized gas enters the air storage tank assembly (900) through the first exhaust pipe (740). At the same time, the volume of the second chamber increases, the air pressure decreases, and the gas in the main air chamber assembly (300) enters the second chamber through the second air inlet pipe (360) of the auxiliary air chamber, and the gas pressure in the main air chamber assembly (300) decreases; S24, when the electric cylinder assembly (600) changes direction again, repeat the above steps S22 and S23; S25, when the pressure difference of the gas in the auxiliary air chamber assembly (500) after being pressurized is lower than the opening pressure of the corresponding one-way valve, the electric cylinder assembly (600) is reset and its operation is stopped; S26, opening the second stop valves (801) on the two impurity deposition assemblies (800), closing the valves after the solid impurities are discharged, and separating the sealing cover plate assembly (340) from the main air chamber housing (310), replacing the damaged electrical appliances and removing the impurities inside; S27, after the sealing cover plate assembly (340) is fixedly connected to the main air chamber housing (310), inflation is performed according to the normal working inflation method S1.

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