Air chamber structure of ring main unit and use method of air chamber structure

Abstract

The invention provides an air chamber structure of a ring main unit and a use method thereof, and belongs to the technical field of ring main unit equipment, the air chamber structure comprises 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 an air storage tank assembly; the main air chamber assembly is located in the electric control cabinet, the auxiliary air chamber assembly is located in 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, and the air storage tank assembly is located outside the electric control cabinet. Every two of the main air chamber assembly, the air storage tank assembly and the auxiliary air chamber assembly are communicated through pipelines. Under the normal condition, the pressure of the gas storage tank assembly and the pressure of the auxiliary gas chamber assembly are both higher than that of the main gas chamber assembly, the stability of the pressure in the main gas chamber assembly is guaranteed, when an arc fault occurs in the main gas chamber assembly, high-pressure gas in the main gas chamber assembly is rapidly discharged and recycled, and resources are saved.

Description

Technical Field

[0001] The invention belongs to the technical field of ring main unit equipment, and in particular relates to an air chamber structure of a ring main unit and a use method thereof. Background Art

[0002] Ring main unit is an important power distribution equipment commonly seen in power systems. It is mainly used for ring network power supply in urban distribution networks. The ring main unit integrates electrical components such as circuit breakers and power electronic switches. The circuit breaker is used for line protection and isolation to ensure safe and reliable operation of the system; the power electronic switch includes power semiconductor switching devices such as metal oxide semiconductor field effect transistors (MOSFET) and insulated gate bipolar transistors (IGBT), 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 size, low price, and can improve power supply parameters and performance as well as power supply safety. It is widely used in distribution stations and box-type substations in various power load centers. When the ring main unit is in use, in order to prevent the risk of electrical explosion caused by electric sparks, a special gas chamber is usually set up inside the cabinet, and a protective gas is filled in the gas chamber to play a protective role. In the prior art, the ring main unit often uses SF6 and other gases with a greenhouse effect as insulating media. When an arc extinguishing reaction occurs, the gas pressure in the gas chamber increases, and the pressure in the gas chamber is quickly relieved through the pressure relief device to protect the gas chamber. However, when an arc fault occurs in the ring main unit with SF6 as the insulating medium, in addition to the increase in gas pressure, the arc will cause part of the SF6 to decompose into active chemical substances such as F, SF4, S2F10, etc. The decomposed substances cannot be restored to SF6, that is, the gas after the fault cannot be recycled and reused. At the same time, the substance containing SF6 is directly discharged outside the cabinet, which will cause waste of resources and environmental pollution.

[0003] Authorization announcement No. CN1165657470B discloses a ring network cabinet pressure relief device and its ring network cabinet, including a gas relief pipe, an adjusting sleeve is sleeved on the gas relief pipe, the adjusting sleeve is threadedly matched with the gas relief pipe, a knob is installed on the end of the adjusting sleeve away from the gas relief pipe, a pressure relief disc is slidably installed in the gas relief pipe, a first telescopic rod is fixedly connected to the side of the pressure relief disc close to the adjusting sleeve, the end of the first telescopic rod away from the pressure relief disc is rotatably connected to the inner end surface of the adjusting sleeve, an adjusting spring is sleeved on the first telescopic rod, one end of the adjusting spring abuts against the pressure relief disc, and the other end of the adjusting spring abuts against the inner end surface of the adjusting sleeve, a pressure relief hole for gas circulation in the adjusting sleeve is opened on the adjusting sleeve, a connecting pipe for discharging insulating gas in the ring network cabinet is installed on the gas relief pipe, and a gas storage tank for storing insulating gas is installed on the end of the connecting pipe away from the gas relief pipe. Although the invention has the effect of ensuring the safe operation of the ring main unit, the invention does not solve the problem of gas recovery and reuse in the gas tank, and also does not explain how to minimize gas loss when replacing electrical components. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention aims to provide a gas chamber structure of a ring main unit and a method for using the same, wherein inert gas is used instead of the commonly used SF6 as an insulating gas, and an auxiliary gas chamber assembly is arranged at the bottom of the main gas chamber assembly. When an arc fault occurs in the main gas chamber assembly, the gas pressure increases. According to the pressure condition of the increased gas pressure, the high-pressure gas of the main gas chamber assembly can be discharged in time and recycled for reuse, and 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 SF6 and other gases with a greenhouse effect as an insulating medium. When an arc extinguishing reaction occurs, the gas pressure in the gas chamber increases, and the gas in the gas chamber is quickly depressurized by a pressure relief device to protect the gas chamber. However, when an arc fault occurs in the ring main unit using SF6 as the insulating medium, in addition to the increase in gas pressure, the arc will cause part of the SF6 to decompose into active chemical substances such as F, SF4, S2F10, etc., and the decomposed substances cannot be reduced to SF6, that is, the gas after the fault cannot be recycled and reused. At the same time, the substances containing SF6 are directly discharged outside the cabinet, which will cause the problem of waste of resources and environmental pollution.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an air chamber structure of a ring network cabinet, comprising an electric control cabinet and a rotating door assembly connected thereto, and also comprising 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 an air tank assembly; the main air chamber assembly is located inside the electric control cabinet and is fixedly connected thereto; the guide rail is located inside the main air chamber assembly and is fixedly connected thereto; the auxiliary air chamber assembly is located inside the electric control cabinet and is fixedly connected thereto, and the auxiliary air chamber assembly is located at the bottom of the main air chamber assembly; the electric cylinder assembly is located on one side of the auxiliary air chamber assembly and is fixedly connected thereto; the impurity deposition assembly is located at the bottom of the auxiliary air chamber assembly and is fixedly connected thereto; the air tank assembly is located outside the electric control cabinet, the main air chamber assembly is connected to the air tank assembly through a pipeline, the auxiliary air chamber assembly is connected to the air tank assembly through a pipeline, and the main air chamber assembly is connected to the auxiliary air chamber assembly.

[0006] Preferably, the electric control cabinet includes a cabinet body, an instrument panel, a main air chamber support seat assembly, an auxiliary air chamber support seat assembly and support feet, the four support feet are located at the bottom of the cabinet body to support it, the instrument panel is connected to the cabinet body, the main air chamber support seat assembly is located inside the cabinet body and is fixedly connected thereto, the auxiliary air chamber support seat assembly is located inside the cabinet body and is fixedly connected thereto, a first through hole, a second through hole and a third through hole are provided on the side of the cabinet body away from the electric cylinder assembly, a fourth through hole and an electric cylinder mounting port are provided on the side of the cabinet body close to the electric cylinder assembly, and a deposition port is provided on the bottom plate of the cabinet body.

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

[0008] Preferably, a first groove is provided on the front of the main air chamber housing, the first sealing gasket and the second sealing gasket are both fixedly connected to the front of the main air chamber housing, the inner periphery of the first groove is the first sealing gasket, and the outer periphery 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 of the cover plate and fixedly connected thereto, a first boss and a second boss are provided on the back of the cover plate, and 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 and the connecting plate are fixedly connected to form an auxiliary air chamber shell, and the first end cover plate assembly and the second end cover plate assembly are both connected to the auxiliary air chamber shell.

[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 is communicated 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, and 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 disk, a fifth through hole is provided on the first connecting rod, and a positioning boss is provided on one end of the connecting disk close to the piston, the first exhaust pipe passes through the first end cover plate assembly, a third one-way valve is provided on the first exhaust pipe, the second exhaust pipe passes through the second end cover plate assembly, and a fourth one-way valve is provided on the second exhaust pipe, and the piston divides the auxiliary air chamber assembly into two chambers, the first chamber is close to the first end cover plate assembly, and the second chamber is close to the second end cover plate assembly.

[0012] Preferably, the gas tank assembly includes a gas tank, an inflation pipe, an emergency pressure relief pipe and a pressurized summary pipe. The gas tank contains pressurized inert gas. The inflation pipe is provided with a third shut-off valve and a pressure gauge. The emergency pressure relief pipe is provided with a fifth one-way valve. The first exhaust pipe and the second exhaust pipe are both connected to the boost summary pipe.

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

[0014] The present invention also provides a method for using the air chamber structure of a ring main unit, the method comprising a normal working air filling method S1 and a fault cleaning method S2;

[0015] The normal working inflation method S1 includes the following steps:

[0016] S11, positioning the piston at the center of the auxiliary air chamber assembly, evacuating the first chamber and the second chamber, and then injecting 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 gas chamber assembly and then close the valve;

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

[0019] The fault cleaning method S2 includes the following steps:

[0020] S21, when an arc extinguishing reaction occurs, the pressure of the inert gas in the main air chamber assembly rises, and at this time there are corresponding changes according to the size of the air pressure. If the air pressure of the main air chamber assembly is greater than the air pressure of the gas tank assembly, all the one-way valves are opened, and the gas in the main air chamber assembly is quickly depressurized to the gas tank assembly through the emergency pressure relief pipe, the first exhaust pipe and the second exhaust pipe at the same time, and each one-way valve is in a closed state after the pressure is balanced; if the air pressure of the main air chamber assembly is greater than the air pressure of the auxiliary air chamber assembly and less than the air pressure of the gas tank assembly, only the first one-way valve and the second one-way valve are in an open state, and each one-way valve is in a closed state after the pressure is balanced; if the air pressure of the main air chamber assembly is still less than the air pressure of the auxiliary air chamber assembly, all the one-way valves are in a closed state at this time;

[0021] S22, start the electric cylinder assembly to shrink it, at which time the volume of the second chamber becomes smaller, the air pressure rises, and the pressurized gas enters the gas storage tank assembly through the second exhaust pipe. At the same time, the volume of the first chamber becomes larger, the air pressure drops, and the gas in the main air chamber assembly enters the first chamber through the first air inlet pipe of the auxiliary air chamber, and the gas pressure in the main air chamber assembly drops;

[0022] S23, when the electric cylinder assembly is reversed, the volume of the first chamber becomes smaller, the air pressure rises, and the pressurized gas enters the gas storage tank assembly through the first exhaust pipe. At the same time, the volume of the second chamber becomes larger, the air pressure drops, and the gas in the main air chamber assembly enters the second chamber through the second air inlet pipe of the auxiliary air chamber, and the gas pressure in the main air chamber assembly drops;

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

[0024] S25, when the pressure difference of the gas in the auxiliary air chamber assembly after pressurization is lower than the opening pressure of the corresponding one-way valve, the electric cylinder assembly is reset and its operation is stopped;

[0025] S26, opening the second stop valves on the two impurity deposition assemblies, closing the valves after the solid impurities are discharged, and separating the sealing cover plate assembly from the main air chamber housing, replacing the damaged electrical appliances and removing the impurities inside;

[0026] S27, after the sealing cover plate assembly is fixedly connected to the main air chamber housing, inflation is performed 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 present invention provides an air chamber structure of a ring main unit. Through the arrangement of an electric control cabinet, 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 an air tank assembly, when an arc fault occurs in the main air chamber assembly, the high-pressure gas in the main air chamber assembly can be quickly discharged. In extremely severe conditions, the high-pressure gas in the main air chamber assembly can be simultaneously discharged to the air tank assembly through an emergency pressure relief pipe, a first exhaust pipe and a second exhaust pipe, thereby ensuring the safety of the main air chamber assembly.

[0029] (2) The present invention provides an air chamber structure for a ring main unit. Under normal circumstances, the pressure of the air tank assembly connected to the main air chamber assembly and the pressure of the auxiliary air chamber assembly are both higher than the pressure of the main air chamber assembly, thereby ensuring the stability of the pressure in the main air chamber assembly.

[0030] (3) The present invention provides an air chamber structure of a ring main unit, in which a filter is arranged on the auxiliary air chamber air 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 is toward the bottom of the auxiliary air chamber assembly, so as to minimize the flow of solid impurities into the gas storage tank assembly along with the circulating gas.

[0031] (4) The present invention provides an air chamber structure of a ring main unit. When an arc fault occurs in a main air chamber assembly, the inert gas of the auxiliary air chamber assembly is pressurized and transported to the gas storage tank assembly through the expansion and contraction of the electric cylinder assembly. At the same time, the inert gas in the main air chamber assembly is transported to the auxiliary air chamber assembly. Only when the pressure difference of the gas in the auxiliary air chamber assembly after pressurization is lower than the opening pressure of its corresponding one-way valve, the inert gas in the auxiliary air chamber assembly and the main air chamber assembly is discharged, the electrical appliance can be replaced or repaired in time, and impurities can be cleaned conveniently. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of the present invention;

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

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

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

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

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

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

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

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

[0041] Fig.10 is a schematic diagram of the intake and exhaust of the first chamber of the present invention when it is compressed;

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

[0043] In the figure: 100, electric control cabinet; 110, cabinet; 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 foot; 200, rotating door assembly; 300, main air chamber assembly; 310, main air chamber housing; 311, first groove; 312, main air chamber air inlet; 313, main air chamber air inlet; 314, main air chamber air inlet; 315, electric cylinder mounting port; 116, deposition port; 117, electric cylinder mounting port; 118, electric cylinder mounting port; 119, electric cylinder mounting port; 120, instrument panel; 130, main air chamber support seat assembly; 140, auxiliary air chamber support seat assembly; 150, support foot; 200, rotating door assembly; 300, main air chamber assembly; 310, main air chamber housing; 311, first groove; 312, main air chamber air inlet; 313, main air chamber air inlet; 314, main air chamber air inlet; 315, electric cylinder mounting port; 316, electric cylinder mounting port; 317, electric cylinder mounting port; 318, electric cylinder mounting port; 319, electric cylinder mounting port; 320, electric cylinder mounting port; 321, electric cylinder mounting port; 322, electric cylinder mounting port; 323, electric cylinder mounting port; 324, electric cylinder mounting port; 325, electric cylinder mounting port; 326, electric cylinder mounting port; 327, electric cylinder mounting port; 328, electric cylinder mounting port; 329, electric cylinder mounting port; 330, electric cylinder mounting port; 33 3. 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. First air inlet pipe of auxiliary air chamber; 351. First one-way valve; 352. Filter; 360. Second air inlet pipe of auxiliary air chamber; 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 assembly; 531, auxiliary air chamber first exhaust port; 540, second end cover 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 plate; 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, air storage tank assembly; 910, air storage tank; 920, charging pipe; 921, third stop valve; 922, pressure gauge; 930, emergency pressure relief pipe; 931, fifth one-way valve; 940, boost summary pipe. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] It should be pointed out that the terms "upper", "lower", "left", "right", "top", "bottom", "inside", "outside" and the like indicating directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting 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.

[0047] Example 1

[0048] See attached Figures 1 to 11 The present embodiment provides an air chamber structure of a ring main unit, including an electric control cabinet 100, a rotating door assembly 200 connected thereto, 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.

[0049] The electric control cabinet 100 includes 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. The four support legs 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 air chamber support seat assembly 130 is located inside the cabinet body 110 and is fixedly connected thereto. The auxiliary air chamber support seat assembly 140 is located inside the cabinet body 110 and is fixedly connected thereto. The main air chamber support seat assembly 130 is located inside the auxiliary air chamber support seat assembly 140. At the top of the air chamber support seat assembly 140, a first through hole 111, a second through hole 112 and a third through hole 113 are provided on the side of the cabinet 110 away from the electric cylinder assembly 600, and the third through hole 113 is located at the bottom of the first through hole 111 and the second through hole 112, and a fourth through hole 114 and an electric cylinder mounting port 115 are provided on the side of the cabinet 110 close to the electric cylinder assembly 600, and the electric cylinder mounting port 115 is located at the bottom of the fourth through hole 114, and a deposition port 116 is opened on the bottom plate of the cabinet 110.

[0050] The main air chamber assembly 300 is located inside the electric control cabinet 100 and is fixedly connected thereto; the main air chamber assembly 300 includes a main air chamber shell 310, a first sealing gasket 320, a second sealing gasket 330, a sealing cover assembly 340, an auxiliary air chamber first air inlet pipe 350 and an auxiliary air chamber second air inlet pipe 360. The main air chamber shell 310 is a rectangular box body with five closed sides. The auxiliary air chamber first air inlet pipe 350 and the auxiliary air chamber second air inlet pipe 360 ​​both pass through the bottom plate of the main air chamber shell 310 and extend into the interior of the auxiliary air chamber assembly 500. A first one-way valve 351 is provided on the auxiliary air chamber first air inlet pipe 350, and a second one-way valve 361 is provided on the auxiliary air chamber second air inlet pipe 360.

[0051] The front 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 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, the main air chamber housing 310 is provided with a main air chamber air inlet 312 and a negative pressure air inlet 313 on the side away from the electric cylinder assembly 600, the connecting pipe of the negative pressure air inlet 313 is provided with a first stop valve 315, the negative pressure air inlet 313 is connected to an external vacuum pump, and the main air chamber housing 310 is provided with an emergency relief valve on the side close to the electric cylinder assembly 600. The pressure port 314, the sealing cover assembly 340 includes a cover 341 and a handle 342, the handle 342 is located on the front side of the cover 341 and is fixedly connected thereto, the back side of the cover 341 is provided with a first boss 343 and a second boss 344, a second groove 345 is formed between the first boss 343 and the second boss 344, when the sealing cover 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 side of the main air chamber housing 310, the second groove 345 is in contact with the first sealing gasket 320, and the outer periphery of the first boss 343 is in contact with the second sealing gasket 330.

[0052] The guide rail 400 is located inside the main air chamber assembly 300 and is 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 described in detail here.

[0053] The auxiliary air chamber assembly 500 is located inside the electric control cabinet 100 and is 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 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.

[0054] 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, and the third groove 512 is connected to the impurity deposition assembly 800. The first end cover plate assembly 530 and the second end cover plate assembly 540 both include end cover plates and guide cylinders. The first end cover plate assembly 530 is provided with an auxiliary air chamber first exhaust port 531, and the second end cover plate assembly 540 is provided with an auxiliary air chamber second exhaust port 541 and an electric cylinder extension shaft mounting hole 542, and a second stop valve 801 is provided on the discharge pipe of the impurity deposition assembly 800.

[0055] The electric cylinder assembly 600 is located at one side of the auxiliary air chamber assembly 500 and is fixedly connected thereto.

[0056] 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 extended shaft of the electric cylinder assembly 600. The first connecting rod assembly 720 includes a first connecting rod 721 and a connecting disk 723. The first connecting rod 721 is provided with a fifth through hole 722. The through hole area where the fifth through hole 722 is located is a minor arc area. The connecting disk 723 is provided with a positioning boss 724 at one end close to the piston 710. The second connecting rod assembly 730 is basically the same in structure as the first connecting rod assembly 720, except that an internal threaded 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 extended shaft of the electric cylinder assembly 600. The first exhaust pipe 740 passes through the first end cover plate assembly 530, and a third one-way valve 741 is arranged on the first exhaust pipe 740. The second exhaust pipe 750 passes through the second end cover plate assembly 540, and a fourth one-way valve 751 is arranged on the second exhaust pipe 750. The piston 710 divides the auxiliary air chamber assembly 500 into two chambers, the first chamber is close to the first end cover plate assembly 530, and the second chamber is close to the second end cover plate assembly 540.

[0057] The impurity deposition assembly 800 is located at the bottom of the auxiliary air chamber assembly 500 and is fixedly connected thereto; the air tank assembly 900 is located outside the electrical control cabinet 100, the main air chamber assembly 300 is connected to the air tank assembly 900 through a pipeline, the auxiliary air chamber assembly 500 is connected to the air tank assembly 900 through a pipeline, and the main air chamber assembly 300 is connected to the auxiliary air chamber assembly 500.

[0058] The gas tank assembly 900 includes a gas tank 910, an inflation pipe 920, an emergency pressure relief pipe 930 and a pressurized summary pipe 940. The gas tank 910 contains pressurized inert gas, usually argon. The gas tank 910 is fixedly connected to the foundation through a support (not shown in the figure). When the main air chamber assembly 300 is in a vacuum state, the main air chamber assembly 300 is replenished with gas to a preset air pressure through the inflation pipe 920, which protects the electrical components of the main air chamber assembly 300. A third stop valve 921 and a pressure gauge 922 are provided on the inflation pipe 920, and a fifth one-way valve 931 is provided on the emergency pressure relief pipe 930. The first exhaust pipe 740 and the second exhaust pipe 750 are both connected to the pressurized summary pipe 940.

[0059] 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 311, the position of the second through hole 112 corresponds to the position of the main air chamber air inlet 312, the position of the third through hole 113 corresponds to the position of the auxiliary air chamber first exhaust port 531, 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 position of the mounting flange 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.

[0060] When the present 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.

[0061] It should be pointed out that no matter what state the piston 710 is in, a vacuum interface (not shown in the figure) is provided in the first chamber and the second chamber of the auxiliary air chamber assembly 500, and the auxiliary air chamber assembly 500 can be evacuated through the vacuum interface. At the same time, a pipeline (not shown in the figure) and a stop valve (not shown in the figure) connected to the gas tank 910 are provided in the first chamber and the second chamber of the auxiliary air chamber assembly 500. Through the corresponding pipeline, inert gas can be filled into the auxiliary air chamber assembly 500 through the gas 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, there are corresponding changes according to the size of the gas pressure and are divided into three conditions. One is that if the main gas The air pressure of the chamber assembly 300 is greater than the air pressure of the gas 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 tank assembly 900 through the emergency pressure relief pipe 930, the first exhaust pipe 740 and the second exhaust pipe 750 at the same time, and each one-way valve is in a closed state after the pressure is balanced; secondly, 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 gas tank assembly 900, only the first one-way valve 351 and the second one-way valve 361 are in an open state, and each one-way valve is in a closed state after the pressure is balanced; thirdly, 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, all the one-way valves are in a closed state at this time.

[0062] The present invention also provides a method for using the air chamber structure of a ring main unit, the method comprising a normal working air filling method S1 and a fault cleaning method S2;

[0063] The normal working inflation method S1 includes the following steps:

[0064] S11, the piston 710 is located at the center of the auxiliary air chamber assembly 500, the first chamber and the second chamber are evacuated, and then an inert gas is injected into the auxiliary air chamber assembly 500 through the gas storage tank assembly 900;

[0065] S12, stop gas injection, open the first stop valve 315, evacuate the main gas chamber assembly 300 and then close the valve;

[0066] S13, opening the third stop valve 921, and injecting inert gas into the main air chamber assembly 300 through the inflation pipe 920;

[0067] The fault cleaning method S2 includes the following steps:

[0068] S21, when the arc extinguishing reaction occurs, the inert gas pressure in the main air chamber assembly 300 rises, and at this time there are corresponding changes according to the size of the air pressure. If the air pressure of the main air chamber assembly 300 is greater than the air pressure of the gas 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 tank assembly 900 through the emergency pressure relief pipe 930, the first exhaust pipe 740 and the second exhaust pipe 750 at the same time, and each one-way valve is in a closed state after the pressure is balanced; 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 gas tank assembly 900, only the first one-way valve 351 and the second one-way valve 361 are in an open state, and each one-way valve is in a closed state after the pressure is balanced; 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, all the one-way valves are in a closed state at this time;

[0069] S22, start the electric cylinder assembly 600 to shrink it, at this time the volume of the second chamber becomes smaller, the air pressure rises, the pressurized gas enters the air storage tank assembly 900 through the second exhaust pipe 750, and at the same time the volume of the first chamber becomes larger, the air pressure drops, 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 drops;

[0070] S23, when the electric cylinder assembly 600 is reversed, the volume of the first chamber becomes smaller, the air pressure rises, 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 becomes larger, the air pressure drops, 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 drops;

[0071] S24, when the electric cylinder assembly 600 changes direction again, repeat the above steps S22 and S23;

[0072] S25, when the pressure difference of the gas in the auxiliary air chamber assembly 500 after pressurization is lower than the opening pressure of the corresponding one-way valve, the electric cylinder assembly 600 is reset and stopped;

[0073] S26, open the second stop valve 801 on the two impurity deposition assemblies 800, close the valve after the solid impurities are discharged, separate the sealing cover plate assembly 340 from the main air chamber housing 310, replace the damaged electrical appliances and remove the impurities inside;

[0074] 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.

[0075] It should be noted that there may be multiple ring main units on site, each of which is equipped with a main air chamber assembly 300 and an auxiliary air chamber assembly 500, but only one total gas storage tank 910 is required on site, and only pipelines need to be added to ensure that the gas storage tank 910 is connected to the corresponding pipelines of the ring main unit.

[0076] 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. 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 air chamber assembly (300) is connected to the gas storage tank assembly (900) via a pipeline, the auxiliary air chamber assembly (500) is connected to the gas storage tank assembly (900) via a pipeline, and the main air chamber assembly (300) is connected to the auxiliary air chamber assembly (500).

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 four support legs (150) are located at the bottom of the cabinet body (110) to support the cabinet body (110), 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 provided at the bottom of the cabinet body (110). 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 the auxiliary air chamber, and a second air inlet pipe (360) of the 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 pass through 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) 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 3 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: The top of the U-shaped plate (510) is provided with an auxiliary air chamber air inlet (511), the bottom of the U-shaped plate (510) is provided with a third groove (512), the third groove (512) is connected to the impurity deposition assembly (800), the first end cover plate assembly (530) is provided with an auxiliary air chamber first exhaust port (531), the second end cover plate assembly (540) is provided with an auxiliary air chamber second exhaust port (541) and an electric cylinder extension shaft mounting hole (542), and the discharge pipe of the impurity deposition assembly (800) is provided with a second stop valve (801).

7. The air chamber structure of the ring main unit according to claim 5, characterized in that: 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 first connecting rod assembly (720) comprises a first connecting rod (721) and a connecting plate (723), the first connecting rod (721) is provided with a fifth through hole (722), the connecting plate (723) is close to the piston A positioning boss (724) is provided at one end of the plug (710); the first exhaust pipe (740) passes through the first end cover plate assembly (530); a third one-way valve (741) is provided on the first exhaust pipe (740); the second exhaust pipe (750) passes through the second end cover plate assembly (540); 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 first chamber is close to the first end cover plate assembly (530), and the second chamber is close to the second end cover plate assembly (540).

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); the emergency pressure relief pipe (930) is provided with a fifth check valve (931); and the first exhaust pipe (740) and the second exhaust pipe (750) are both connected to the pressurized collecting pipe (940).

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 any one of claims 1 to 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 first air inlet pipe (350) of the auxiliary air chamber, 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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