Environment-friendly supercharged solid insulating cylinder and load switch using same

Abstract

The invention discloses an environment-friendly supercharged solid insulating cylinder which comprises a barrel-shaped first insulating shell, an upper conductor, a compressed air type arc extinguish chamber and a lower conductor are embedded in the barrel bottom of the first insulating shell, the static end of the compressed air type arc extinguish chamber is connected with one end of the upper conductor, and the other end of the upper conductor extends out of the first insulating shell. One end of the lower conductor is connected with the moving end of the compressed air type arc extinguish chamber, the other end of the lower conductor extends out of the first insulating shell, a grounding static contact is arranged in a barrel cavity of the first insulating shell, and the grounding static contact is connected with the lower conductor. The invention also discloses a load switch using the environment-friendly supercharged solid insulating cylinder. According to the environment-friendly supercharged solid insulating cylinder and the load switch using the same, dry air is adopted as an insulating and breaking medium, and the purposes of miniaturization, cost reduction, environmental protection and high performance are truly achieved.

Description

Environmentally friendly pressurized solid insulation cylinder and load switches using it Technical Field

[0001] This invention relates to the field of power equipment, and in particular to an environmentally friendly pressurized solid insulation cylinder and a load switch using the same. Background Technology

[0002] In the power equipment sector, SF6 (sulfur hexafluoride) gas has long held a dominant position due to its excellent insulation and arc-extinguishing properties. However, its greenhouse effect potential is as high as 24,300 times that of CO2, posing a significant challenge to the global carbon reduction process. Load switch solutions are widely used in ring main units. Mature load switches use SF6 as the insulation and breaking medium, and while the technology is mature and cost-effective, they cannot meet the market demands for environmental friendliness, economy, and high performance. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an environmentally friendly pressurized solid insulating cylinder and a load switch using the same, which uses dry air as the insulating and breaking medium, and truly achieves the goals of miniaturization, cost reduction, environmental protection and high performance.

[0004] The environmentally friendly pressurized solid insulating cylinder of the present invention includes a first insulating shell in the shape of a barrel. An upper conductor, a compressed air arc-extinguishing chamber, and a lower conductor are embedded in the bottom of the first insulating shell. The moving end of the compressed air arc-extinguishing chamber is arranged towards the opening of the first insulating shell and extends into the cavity of the first insulating shell. The stationary end of the compressed air arc-extinguishing chamber is located inside the bottom of the first insulating shell and is connected to one end of the upper conductor thereon. The other end of the upper conductor extends outside the first insulating shell. One end of the lower conductor is located inside the bottom of the first insulating shell and is connected to the moving end of the compressed air arc-extinguishing chamber. The other end of the lower conductor extends outside the first insulating shell. A grounding stationary contact is provided inside the cavity of the first insulating shell. The grounding stationary contact is located on the bottom of the first insulating shell and is connected to the end of the lower conductor located inside the bottom of the first insulating shell.

[0005] The environmentally friendly pressurized solid insulating cylinder of the present invention includes a conductive support seat fitted on the moving end of the compressed air arc-extinguishing chamber. A first spring contact finger is provided around the moving end of the compressed air arc-extinguishing chamber inside the conductive support seat. The first spring contact finger contacts the moving end of the compressed air arc-extinguishing chamber. A flexible connection is connected to the conductive support seat. Both the conductive support seat and the flexible connection are located on the bottom of the first insulating shell. A conductive rod is embedded in the bottom of the first insulating shell. One end of the conductive rod is located inside the bottom of the first insulating shell and is connected to one end of the lower conductor at that location. The other end of the conductive rod extends into the cavity of the first insulating shell and is connected to the flexible connection.

[0006] The environmentally friendly pressurized solid insulating cylinder of the present invention includes a grounding stationary contact that is barrel-shaped, with the opening of the grounding stationary contact facing the opening of the first insulating shell. A second spring contact finger is arranged circumferentially inside the barrel cavity of the grounding stationary contact. A grounding guide rod is inserted through the bottom of the barrel of the grounding stationary contact. A first radial protrusion is provided on one end of the grounding guide rod located inside the barrel cavity of the grounding stationary contact. The other end of the grounding guide rod located outside the grounding stationary contact passes sequentially through a conductive support base and a flexible connection and is then connected to the bottom of the barrel of the first insulating shell. The flexible connection, the conductive support base, and the bottom of the barrel of the grounding stationary contact abut against the bottom of the barrel of the first insulating shell and the first radial protrusion.

[0007] The environmentally friendly pressurized solid insulating cylinder of this invention includes a compressed air arc-extinguishing chamber comprising a barrel-shaped second insulating shell, which is embedded in the bottom of a first insulating shell, with the opening of the second insulating shell facing the opening of the first insulating shell. The stationary end of the compressed air arc-extinguishing chamber includes a conductive base, a stationary arc contact, and a stationary main contact. The conductive base is inserted into the bottom of the second insulating shell and connected to one end of the upper conductor located inside the bottom of the first insulating shell. The stationary main contact is barrel-shaped and located within the cavity of the second insulating shell, with its opening facing the opening of the second insulating shell. The stationary arc contact is rod-shaped and inserted into the bottom of the stationary main contact. Both the stationary main contact and the stationary arc contact are mounted on the conductive base. The moving end of the compressed air arc-extinguishing chamber includes a moving conductive rod, a moving main contact, a moving arc contact, and a nozzle. The second insulating shell has a stopper at its opening. The moving conductive rod is inserted through the stopper. One end of the moving conductive rod, located inside the cavity of the second insulating shell, has a moving main contact that can be inserted into or separated from the opening of the stationary main contact. The moving main contact has a moving arc contact that can be inserted into or separated from the end of the stationary arc contact located inside the cavity of the stationary main contact. The moving arc contact has a nozzle. A piston disc, which can slide and seal along the cavity of the second insulating shell, is fitted on the moving main contact. The moving main contact has a vent hole. One end of the vent hole is connected to the nozzle, and the other end of the vent hole is connected to the cavity of the second insulating shell between the piston disc and the stopper. One end of the moving conductive rod, located outside the second insulating shell, is inside the cavity of the first insulating shell and has a conductive support seat fitted on it. The first spring contact finger is arranged around the moving conductive rod and contacts the moving conductive rod.

[0008] The environmentally friendly pressurized solid insulating cylinder of the present invention has a second radial protrusion on one end of the static arc contact located inside the static main contact cylinder cavity, and the other end of the static arc contact located outside the static main contact is connected to the conductive base. The bottom of the static main contact cylinder abuts between the second radial protrusion and the conductive base.

[0009] The environmentally friendly pressurized solid insulating cylinder of this invention comprises a moving main contact, a moving arc contact, and a nozzle, all of which are cylindrical. One end of the moving main contact is located on the end of the moving conductive rod within the cavity of the second insulating shell. The other end of the moving main contact is connected to one end of the moving arc contact, and the other end of the moving arc contact is connected to one end of the nozzle. The other end of the nozzle is conical. The cavities of the moving main contact, the moving arc contact, and the nozzle are sequentially connected. One end of the vent hole is connected to the cavity of the moving main contact. The outer diameter of the moving main contact matches the inner diameter of the barrel opening of the stationary main contact. The inner diameter of the nozzle is larger than the diameter of the end of the stationary arc contact located within the cavity of the stationary main contact. The end of the stationary arc contact located within the cavity of the stationary main contact can pass through the nozzle and be inserted into or separated from the cavity of the moving arc contact.

[0010] The environmentally friendly pressurized solid insulating cylinder of the present invention has an upper sleeve and a lower sleeve extending away from the bottom of the first insulating shell. The upper sleeve and the lower sleeve are respectively located on opposite sides of the first insulating shell. The upper conductor is nested in the upper sleeve, and the end of the upper conductor that is not connected to the stationary end of the compressed air arc-extinguishing chamber extends along the upper sleeve to the outside of the upper sleeve. The lower conductor is nested in the lower sleeve, and the end of the lower conductor that is not connected to the moving end of the compressed air arc-extinguishing chamber extends along the lower sleeve to the outside of the lower sleeve.

[0011] The environmentally friendly pressurized solid insulating cylinder of the present invention has a first shielding mesh inside the cylinder wall of the upper sleeve, a second shielding mesh inside the cylinder wall of the lower sleeve, a third shielding mesh and a fourth shielding mesh inside the bottom of the first insulating shell, the third shielding mesh being located outside the connection between the stationary end of the compressed air arc extinguishing chamber and the upper conductor, the fourth shielding mesh being located outside the connection between the conductive rod and the lower conductor, and a fifth shielding mesh inside the cylinder wall of the first insulating shell.

[0012] The environmentally friendly pressurized solid insulating cylinder of the present invention has a conductive layer coated on the outer wall of the first insulating shell, and a conductive layer coated on the outer walls of the upper sleeve and the lower sleeve.

[0013] The load switch using the aforementioned environmentally friendly pressurized solid insulating cylinder in this invention includes an operating mechanism. Three environmentally friendly pressurized solid insulating cylinders are sealed and connected to the operating mechanism. The opening of the first insulating shell of each environmentally friendly pressurized solid insulating cylinder is sealed and connected to the operating mechanism. The operating mechanism is equipped with three moving conductive rods and three grounding moving contacts. The three moving conductive rods are respectively connected to the moving conductive rods in the three environmentally friendly pressurized solid insulating cylinders. The three grounding moving contacts can be connected to or disconnected from the grounding stationary contacts in the three environmentally friendly pressurized solid insulating cylinders.

[0014] The present invention, an environmentally friendly pressurized solid insulating cylinder and a load switch using it, differs from existing technologies in that it innovatively combines solid insulation with pressurized arc extinguishing (i.e., a compressed air arc extinguishing chamber is installed inside the solid insulating cylinder). This integration of the advantages of both technologies—a miniaturized solid insulating cylinder combined with pressurized arc extinguishing—achieves a synergistic effect, resulting in more stable breaking and closing performance. Compared to traditional solid-insulated load switches, this invention can achieve opening and closing in a single operation, eliminating the need for energy storage. Compared to gas-insulated load switches, this invention offers the advantage of miniaturization. Furthermore, by using dry, atmospheric-pressure air as the insulation and breaking medium, it eliminates the risk of air leakage and is more environmentally friendly. Therefore, this invention truly achieves the goals of miniaturization, cost reduction, environmental friendliness, and high performance.

[0015] The invention will now be further described with reference to the accompanying drawings. Attached Figure Description

[0016] Figure 1 is a top view of the load switch in this invention; Figure 2 is a left view of the load switch in this invention; Figure 3 is a cross-sectional view along line AA in Figure 2 (the load switch is in the closed state, at which time the moving main contact and the stationary main contact are completely closed); Figure 4 is a partial enlarged view of point B in Figure 3; Figure 5 is a cross-sectional view along line AA in Figure 2 (the process of the load switch from closed to open, at which time the moving main contact and the stationary main contact separate, the moving arc contact and the stationary arc contact contact, and the moving end moves to compress gas); Figure 6 is a cross-sectional view of point C in Figure 5. Figure 7 is a sectional view along line AA in Figure 2 (the process of the load switch from closing to opening, at which time the moving arc contact and the stationary arc contact separate and generate an electric arc, and the airflow to the arc region is generated due to the compression of gas by the moving end); Figure 8 is a partial enlarged view of point D in Figure 7; Figure 9 is a sectional view along line AA in Figure 2 (the load switch is in the open state, at which time the moving main contact and the stationary main contact separate, and the moving arc contact and the stationary arc contact also separate); Figure 10 is a partial enlarged view of point E in Figure 9.

[0017] In the attached diagram, the following symbols are used: 01, Operating mechanism; 02, Insulating cylinder; 03, Upper sleeve; 04, Lower sleeve; 05, Lower conductor; 06, Second shielding mesh; 07, Fifth shielding mesh; 08, Grounding stationary contact; 09, Second spring contact finger; 10, First insulating shell; 11, Grounding moving contact; 12, Moving conductive rod pull rod; 13, Upper conductor; 14, First shielding mesh; 15, Moving conductive rod; 16, Flexible connection; 17, First radial protrusion; 18, Grounding guide rod; 19. 20. Rod-shaped part; 21. Conductive support base; 22. First spring contact finger; 23. Ring-shaped part; 24. Seal; 25. Second insulating shell; 26. Compressed arc-extinguishing chamber; 27. Piston disc; 28. Moving main contact; 29. ​​Moving arc contact; 30. Nozzle; 31. Stationary main contact; 32. Stationary arc contact; 33. Conductive base; 34. Third shielding mesh; 35. Second radial protrusion; 36. Contact head; 37. Fourth shielding mesh; 38. Tension spring; 39. Vent hole; 30. Conductive rod. Detailed Implementation

[0018] As shown in Figure 1 and in conjunction with Figures 2-10, the environmentally friendly pressurized solid insulating cylinder 02 of this invention includes a barrel-shaped first insulating shell 10. An upper conductor 13, a compressed air arc-extinguishing chamber 25, and a lower conductor 05 are embedded in the bottom of the first insulating shell 10. The moving end of the compressed air arc-extinguishing chamber 25 is arranged towards the opening of the first insulating shell 10 and extends into the cavity of the first insulating shell 10. The stationary end of the compressed air arc-extinguishing chamber 25 is located inside the bottom of the first insulating shell 10 and is connected to one end of the upper conductor 13 at that location. Then, the other end of the upper conductor 13 extends to the outside of the first insulating shell 10, one end of the lower conductor 05 is located inside the bottom of the first insulating shell 10 and connected to the moving end of the compressed air arc extinguishing chamber 25, and the other end of the lower conductor 05 extends to the outside of the first insulating shell 10. A grounding stationary contact 08 is provided inside the cavity of the first insulating shell 10. The grounding stationary contact 08 is located on the bottom of the first insulating shell 10 and is connected to the end of the lower conductor 05 located inside the bottom of the first insulating shell 10.

[0019] As shown in Figure 3-10, the environmentally friendly pressurized solid insulating cylinder 02 of the present invention has a conductive support seat 20 sleeved on the moving end of the compressed air arc-extinguishing chamber 25. A first spring contact finger 21 is provided around the moving end of the compressed air arc-extinguishing chamber 25 inside the conductive support seat 20. The first spring contact finger 21 contacts the moving end of the compressed air arc-extinguishing chamber 25. A flexible connection 16 is connected to the conductive support seat 20. Both the conductive support seat 20 and the flexible connection 16 are located on the bottom of the first insulating shell 10. A conductive rod 39 is embedded in the bottom of the first insulating shell 10. One end of the conductive rod 39 is located inside the bottom of the first insulating shell 10 and is connected to one end of the lower conductor 05 at that location. The other end of the conductive rod 39 extends into the cavity of the first insulating shell 10 and is connected to the flexible connection 16.

[0020] As shown in Figures 3, 5, 7, and 9, the environmentally friendly pressurized solid insulating cylinder 02 of this invention includes a grounding stationary contact 08 in the shape of a barrel. The opening of the grounding stationary contact 08 faces the opening of the first insulating shell 10. A second spring contact finger 09 arranged circumferentially is fixed inside the barrel cavity of the grounding stationary contact 08. A grounding guide rod 18 is inserted through the bottom of the barrel of the grounding stationary contact 08. The grounding guide rod 18 is coaxially arranged with the grounding stationary contact 08. The two ends of the grounding guide rod 18 are located inside and outside the grounding stationary contact 08, respectively. A first radial protrusion 17 is provided on the end of the grounding guide rod 18 located inside the barrel cavity of the grounding stationary contact 08. The end of the grounding guide rod 18 located outside the grounding stationary contact 08 passes through the conductive support seat 20 and the flexible connection 16 in sequence and is connected to the bottom of the barrel of the first insulating shell 10. The flexible connection 16, the conductive support seat 20, and the bottom of the barrel of the grounding stationary contact 08 abut against the bottom of the barrel of the first insulating shell 10 and the first radial protrusion 17.

[0021] The conductive support base 20 includes a fixedly connected annular portion 22 and rod-shaped portion 19. The annular portion 22 and rod-shaped portion 19 are integrally formed. The annular portion 22 is sleeved on the moving end of the compressed air arc-extinguishing chamber 25. A first spring contact finger 21 arranged circumferentially is fixed on the inner side wall of the annular portion 22. The moving end of the compressed air arc-extinguishing chamber 25 passes through the first spring contact finger 21, and the first spring contact finger 21 contacts the moving end of the compressed air arc-extinguishing chamber 25.

[0022] One end of the grounding guide rod 18, located outside the grounding stationary contact 08, passes through the rod-shaped portion 19 of the conductive support 20 and the flexible connection 16 in sequence, and is then fixedly connected to the bottom of the first insulating housing 10 until the flexible connection 16, the rod-shaped portion 19 of the conductive support 20, and the bottom of the grounding stationary contact 08 abut against the bottom of the first insulating housing 10 and the first radial protrusion 17. In this way, the flexible connection 16, the conductive support 20, and the grounding stationary contact 08 are fixed to the bottom of the first insulating housing 10 by the grounding guide rod 18. At this time, the rod-shaped portion 19 of the conductive support 20 is in contact with the flexible connection 16, thus achieving the connection between the two.

[0023] When fixing the grounding guide rod 18 to the bottom of the first insulating housing 10, the grounding guide rod 18 can be threaded to the bottom of the first insulating housing 10. Alternatively, a blind hole can be provided on the bottom of the first insulating housing 10, and then the grounding guide rod 18 can be inserted into the blind hole. Both of these methods can fix the grounding guide rod 18 to the bottom of the first insulating housing 10.

[0024] As shown in Figure 3-10, the environmentally friendly pressurized solid insulating cylinder 02 of this invention includes a compressed air arc-extinguishing chamber 25 comprising a barrel-shaped second insulating shell 24. The second insulating shell 24 is embedded in the bottom of the first insulating shell 10, with the opening of the second insulating shell 24 facing the opening of the first insulating shell 10. The stationary end of the compressed air arc-extinguishing chamber 25 includes a conductive base 32, a stationary arc contact 31, and a stationary main contact 30. The conductive base 32 is inserted into the bottom of the second insulating shell 24, and the conductive base 32 is connected to the upper conductor. One end of 13 is connected inside the bottom of the first insulating housing 10. The stationary main contact 30 is barrel-shaped and located inside the barrel cavity of the second insulating housing 24. The opening of the stationary main contact 30 faces the opening of the second insulating housing 24. The stationary arc contact 31 is rod-shaped and is inserted into the bottom of the stationary main contact 30. Both the stationary main contact 30 and the stationary arc contact 31 are fixed on the conductive base 32. The moving end of the compressed air arc-extinguishing chamber 25 includes a moving conductive rod 15, a moving main contact 27, a moving arc contact 28, and a nozzle 29. A stopper 23 is fixedly provided on the opening of the second insulating housing 24. The moving conductive rod 15 is inserted through the stopper 23. A moving main contact 27, which can be inserted into or separated from the opening of the stationary main contact 30, is fixedly provided on one end of the moving conductive rod 15 located inside the cavity of the second insulating housing 24. A moving arc contact 28, which can be inserted into or separated from the end of the stationary arc contact 31 located inside the cavity of the stationary main contact 30, is fixedly provided on the moving main contact 27. A nozzle 29 is fixedly provided on the moving arc contact 28. A nozzle 29 is fixedly sleeved on the moving main contact 27. A piston disc 26 capable of sliding along the sealed cavity of the second insulating housing 24; a vent hole 38 is provided on the moving main contact 27; one end of the vent hole 38 is connected to a nozzle 29; the other end of the vent hole 38 is connected to the cavity of the second insulating housing 24 between the piston disc 26 and the plug 23; one end of the moving conductive rod 15 located outside the second insulating housing 24 is located inside the cavity of the first insulating housing 10 and is fitted with a conductive support seat 20; the first spring contact finger 21 is arranged around the moving conductive rod 15 and contacts the moving conductive rod 15.

[0025] The opening of the second insulating shell 24 faces the opening of the first insulating shell 10. The movable conductive rod 15 is slidably and sealingly mounted on the seal 23 of the opening of the second insulating shell 24. The remaining components of the moving end of the compressed air arc-extinguishing chamber 25 are all mounted on the movable conductive rod 15. Therefore, it can be considered that the moving end of the compressed air arc-extinguishing chamber 25 faces the opening of the first insulating shell 10. Since the movable conductive rod 15 is part of the compressed air arc-extinguishing chamber 25, and its end located outside the second insulating shell 24 is inside the cavity of the first insulating shell 10, it can be considered that the moving end of the compressed air arc-extinguishing chamber 25 extends into the cavity of the first insulating shell 10.

[0026] The moving conductive rod 15 is part of the moving end of the compressed air arc-extinguishing chamber 25. Specifically, the connection between the moving end of the compressed air arc-extinguishing chamber 25 and the conductive support base 20 refers to the connection between the moving conductive rod 15 and the conductive support base 20. Specifically, the moving conductive rod 15 is fitted with an annular portion 22 of the conductive support base 20, and the moving conductive rod 15 passes through a first spring contact finger 21, meaning the first spring contact finger 21 is arranged around the moving conductive rod 15 and contacts the moving conductive rod 15. The function of the first spring contact finger 21 is to enable electrical connection between the moving conductive rod 15 and the conductive support base 20.

[0027] The environmentally friendly pressurized solid insulating cylinder 02 of the present invention has a second radial protrusion 34 on one end of the static arc contact 31 located inside the cylinder cavity of the static main contact 30, and the other end of the static arc contact 31 located outside the static main contact 30 is fixedly connected to the conductive base 32, and the bottom of the static main contact 30 abuts between the second radial protrusion 34 and the conductive base 32.

[0028] The environmentally friendly pressurized solid insulating cylinder 02 of this invention includes a moving main contact 27, a moving arc contact 28, and a nozzle 29, all of which are cylindrical. One end of the moving main contact 27 is fixedly mounted on one end of the moving conductive rod 15 located inside the cavity of the second insulating shell 24. The other end of the moving main contact 27 is fixedly connected to one end of the moving arc contact 28, and the other end of the moving arc contact 28 is fixedly connected to one end of the nozzle 29. The other end of the nozzle 29 is conical. 7. The cavities of the moving arc contact 28 and the nozzle 29 are connected in sequence. One end of the nozzle 29 of the vent 38 is connected to the cavity of the moving main contact 27. The outer diameter of the moving main contact 27 matches the inner diameter of the barrel opening of the stationary main contact 30. The inner diameter of the nozzle 29 is larger than the diameter of the end of the stationary arc contact 31 located inside the cavity of the stationary main contact 30. The end of the stationary arc contact 31 located inside the cavity of the stationary main contact 30 can pass through the nozzle 29 and be inserted into or separated from the cavity of the moving arc contact 28.

[0029] Since one end of the vent 38 connecting nozzle 29 is connected to the cavity of the moving main contact 27, and the cavities of the moving main contact 27, the moving arc contact 28, and the nozzle 29 are connected in sequence, one end of the vent 38 connecting nozzle 29 can be connected to the cavity of the nozzle 29 in sequence through the cavity of the moving main contact 27 and the cavity of the moving arc contact 28, thus achieving the purpose of connecting one end of the vent 38 to the nozzle 29.

[0030] The cylinder cavity of nozzle 29 is connected to the cylinder cavity of the second insulating housing 24 between piston disc 26 and bottom of the second insulating housing 24. In other words, the vent hole 38 on the moving main contact 27 can connect to the cylinder cavity of the second insulating housing 24 located on opposite sides of piston disc 26.

[0031] The second insulating housing 24 has a first threaded hole at the center of its bottom, and the conductive seat 32 is threaded onto this first threaded hole. The conductive seat 32 has a second threaded hole arranged coaxially with the second insulating housing 24. One end of the upper conductor 13 located inside the bottom of the first insulating housing 10 is fixedly connected to the outer end of the second threaded hole of the conductive seat 32 by bolts, thereby completing the connection between the upper conductor 13 and the conductive seat 32, that is, completing the connection between the upper conductor 13 and the stationary end of the compressed air arc-extinguishing chamber 25.

[0032] One end of the stationary arc contact 31, located outside the stationary main contact 30, is threaded into the inner end of the second threaded hole of the conductive base 32, until the bottom of the stationary main contact 30 abuts against the conductive base 32 and the second radial protrusion 34, thereby fixing both the stationary main contact 30 and the stationary arc contact 31 onto the conductive base 32. Since the second threaded hole on the conductive base 32 is coaxially arranged with the second insulating shell 24, the stationary arc contact 31 is also coaxially arranged with the second insulating shell 24. The stationary arc contact 31 passes through the middle of the bottom of the stationary main contact 30, thus ensuring that the stationary main contact 30 is also coaxially arranged with the second insulating shell 24.

[0033] The stationary arc contact 31 has a spherical contact head 35 located at one end inside the cavity of the stationary main contact 30. The contact head 35 is part of the stationary arc contact 31, and its diameter is smaller than the inner diameter of the nozzle 29. The diameter of the contact head 35 matches the inner diameter of the cavity of the moving arc contact 28, and the contact head 35 can pass through the nozzle 29 to be inserted into or separated from the cavity of the moving arc contact 28.

[0034] When setting the cavity of the moving arc contact 28, the inner diameter of the cavity near the moving main contact 27 is larger than the diameter of the contact head 35, while the inner diameter of the cavity near the nozzle 29 is equal to or slightly smaller than the diameter of the contact head 35. In this way, when the moving arc contact 28 and the stationary arc contact 31 move closer to each other, the contact head 35 of the stationary arc contact 31 passes through the nozzle 29 and contacts the cavity of the moving arc contact 28 near the nozzle 29, thus achieving the insertion of the two. Afterwards, the moving arc contact 28 and the stationary arc contact 31 continue to move closer to each other, and the contact head 35 comes into the cavity of the moving arc contact 28 near the moving main contact 27. Since the inner diameter of the cavity of the moving arc contact 28 near the moving main contact 27 is larger than the diameter of the contact head 35, the contact head 35 does not contact the moving arc contact 28, and the stationary arc contact 31 separates from the moving arc contact 28. Subsequently, when the moving arc contact 28 and the stationary arc contact 31 move away from each other again, the contact head 35 can still move into the cylinder cavity of the moving arc contact 28 near the nozzle 29 to achieve contact between the two. When the moving arc contact 28 and the stationary arc contact 31 continue to move away from each other, the contact head 35 separates from the moving arc contact 28, that is, the stationary arc contact 31 separates from the moving arc contact 28.

[0035] The moving conductive rod 15 is coaxially arranged with the second insulating shell 24, and the moving conductive rod 15 can slide along the seal 23 to drive the piston disc 26 to slide along the cavity of the second insulating shell 24, ultimately completing the contact and separation of the moving end and the stationary end of the compressed air arc-extinguishing chamber 25. When the moving conductive rod 15 slides along the seal 23, its sliding direction is its own axis, which is also the axis of the second insulating shell 24.

[0036] The stationary main contact 30, the stationary arc contact 31, and the nozzle 29 are all arranged coaxially with the second insulating housing 24. The moving arc contact 28 is fixedly connected inside the cavity of the stationary main contact 30, and the nozzle 29 is fixedly snapped onto the outer peripheral side wall of the stationary arc contact 31. At this time, the two ends of the stationary arc contact 31 are located inside the cavities of the stationary main contact 30 and the nozzle 29, respectively.

[0037] The stationary grounding contact 08 and the moving conductive rod 15 are arranged side by side at intervals, that is, the axial direction of the stationary grounding contact 08 is the same as the axial direction of the moving conductive rod 15.

[0038] The flexible connector 16, the conductive support base 20, and the grounding stationary contact 08 are connected together through the grounding guide rod 18. Then, the lower conductor 05 is connected to the moving conductive rod 15 in sequence through the conductive rod 39, the flexible connector 16, and the conductive support base 20, that is, connected to the moving end of the compressed air arc-extinguishing chamber 25; the grounding stationary contact 08 is connected to the lower conductor 05 in sequence through the conductive support base 20, the flexible connector 16, and the conductive rod 39.

[0039] As shown in Figures 1-3, 5, 7, and 9, the environmentally friendly pressurized solid insulating cylinder 02 of the present invention has an upper sleeve 03 and a lower sleeve 04 extending away from the bottom of the first insulating shell 10. The upper sleeve 03 and the lower sleeve 04 are located on opposite sides of the first insulating shell 10. The upper conductor 13 is nested inside the upper sleeve 03, and the end of the upper conductor 13 that is not connected to the stationary end of the compressed air arc-extinguishing chamber 25 extends along the upper sleeve 03 to the outside of the upper sleeve 03. The lower conductor 05 is nested inside the lower sleeve 04, and the end of the lower conductor 05 that is not connected to the moving end of the compressed air arc-extinguishing chamber 25 extends along the lower sleeve 04 to the outside of the lower sleeve 04.

[0040] Both the upper sleeve 03 and the lower sleeve 04 are integrally formed with the first insulating shell 10. Therefore, the end of the upper conductor 13 that is not connected to the stationary end of the compressed air arc-extinguishing chamber 25 extends to the outside of the upper sleeve 03, which is considered to extend to the outside of the first insulating shell 10. The end of the lower conductor 05 that is not connected to the moving end of the compressed air arc-extinguishing chamber 25 extends to the outside of the lower sleeve 04, which is considered to extend to the outside of the first insulating shell 10.

[0041] As shown in Figure 3-10, the environmentally friendly pressurized solid insulating cylinder 02 of the present invention has a first shielding mesh 14 inside the cylinder wall of the upper sleeve 03, a second shielding mesh 06 inside the cylinder wall of the lower sleeve 04, a third shielding mesh 33 and a fourth shielding mesh 36 inside the bottom of the first insulating shell 10, the third shielding mesh 33 being located outside the connection between the stationary end of the compressed air arc-extinguishing chamber 25 and the upper conductor 13, the fourth shielding mesh 36 being located outside the connection between the conductive rod 39 and the lower conductor 05, and a fifth shielding mesh 07 inside the cylinder wall of the first insulating shell 10.

[0042] The second shielding mesh 06 can also be connected to a live indicator to show whether the lower sleeve 04 is live, and at the same time it also serves as a low-voltage shield to optimize the electric field at the connection point.

[0043] The environmentally friendly pressurized solid insulating cylinder 02 of the present invention has a conductive layer coated on the outer wall of the first insulating shell 10, and a conductive layer coated on the outer walls of the upper sleeve 03 and the lower sleeve 04.

[0044] As shown in Figures 1-3, 5, 7, and 9, the load switch using the aforementioned environmentally friendly pressurized solid insulating cylinder 02 in this invention includes an operating mechanism 01. Three environmentally friendly pressurized solid insulating cylinders 02 are sealed and connected to the operating mechanism 01. The opening of the first insulating shell 10 of each environmentally friendly pressurized solid insulating cylinder 02 is sealed and connected to the operating mechanism 01. The operating mechanism 01 is equipped with three moving conductive rods 12 and three grounding moving contacts 11. The three moving conductive rods 12 are respectively fixedly connected to the moving conductive rods 15 in the three environmentally friendly pressurized solid insulating cylinders 02. The three grounding moving contacts 11 can be connected to or separated from the grounding stationary contacts 08 in the three environmentally friendly pressurized solid insulating cylinders 02.

[0045] The operating mechanism 01 is existing technology, which can drive the moving conductive rod 12 and the grounding moving contact 11. The moving conductive rod 12 is coaxially arranged with the moving conductive rod 15, and the grounding moving contact 11 is coaxially arranged with the grounding stationary contact 08.

[0046] Since the opening of the first insulating housing 10 is sealed to the operating mechanism 01, the movable conductive rod 12 can extend from the opening of the first insulating housing 10 into the first insulating housing 10. The end of the movable conductive rod 15 located outside the second insulating housing 24 is inside the cavity of the first insulating housing 10, so the movable conductive rod 12 can be fixedly connected to the movable conductive rod 15.

[0047] Since the grounding stationary contact 08 is located inside the barrel cavity of the first insulating housing 10, and the grounding moving contact 11 is arranged coaxially with the grounding stationary contact 08, the grounding moving contact 11 can be connected or separated from the grounding stationary contact 08 under the drive of the operating mechanism 01.

[0048] As shown in Figures 3 and 4, the load switch is in the closed state. At this time, the moving main contact 27 and the stationary main contact 30 are completely closed, or in other words, in full contact. The moving main contact 27 is inserted into the opening of the stationary main contact 30, achieving the insertion connection between the two. The moving arc contact 28 and the stationary arc contact 31 are not in contact, and the contact head 35 is located in the cavity of the moving arc contact 28 near the end of the moving main contact 27. The grounding moving contact 11 and the grounding stationary contact 08 are separated. At this time, the current flow is as follows: upper conductor 13 → conductive base 32 → moving main contact 27 → stationary main contact 30 → moving conductive rod 15 → conductive support base 20 → flexible connection 16 → conductive rod 39 → lower conductor 05.

[0049] The following describes the operation process of the load switch from closing to opening: As shown in Figures 3 and 4, the operating mechanism 01 drives the moving conductive rod 12 and the moving conductive rod 15 to move to the right together, gradually separating the moving end and the stationary end of the compressed air arc-extinguishing chamber 25. At this time, the moving conductive rod 15 slides to the right along the sealing block 23. Since the conductive support seat 20 is fixed on the bottom of the first insulating shell 10, the moving conductive rod 15 also slides to the right along the conductive support seat 20. The moving main contact 27 is fixed on the moving conductive rod 15, while the moving arc contact 28 and the piston disc 26 are fixed on the moving main contact 27, and the nozzle 29 is fixed on the moving arc contact 28. Therefore, the moving main contact 27, the moving arc contact 28, the nozzle 29, and the piston disc 26 can move to the right together with the moving conductive rod 15. At this time, the piston disc 26 slides to the right along the cavity of the second insulating shell 24, and the piston disc 26 can compress the gas in the cavity of the second insulating shell 24 between itself and the sealing block 23. As shown in Figures 5 and 6, as the moving conductive rod 12 and the moving conductive rod 15 continue to move to the right, the moving main contact 27 slides outward from the stationary main contact 30. Before the moving main contact 27 separates from the stationary main contact 30, the contact head 35 of the stationary arc contact 31 slides from the end of the moving arc contact 28 near the moving main contact 27 to the end near the nozzle 29, and the contact head 35 contacts the moving arc contact 28, that is, the stationary arc contact 31 contacts the moving arc contact 28. The moving main contact 27 then slides out completely. After the stationary main contact 30 separates from the moving arc contact 28, the contact head 35 of the stationary arc contact 31 remains in contact with the moving arc contact 28 (at this time, the current flow is: upper conductor 13 → conductive seat 32 → stationary arc contact 31 → moving arc contact 28 → moving main contact 27 → moving conductive rod 15 → conductive support seat 20 → flexible connection 16 → conductive rod 39 → lower conductor 05). Of course, the piston disc 26 continues to compress the gas in the second insulating shell 24 cavity between itself and the seal 23. As shown in Figures 7 and 8, as the moving conductive rod pull rod 12 and the moving conductive rod 15 continue to move to the right, the contact head 35 of the stationary arc contact 31 also separates from the moving arc contact 28 (at this time, an electric arc is generated between the two). The contact head 35 moves into the cavity of the nozzle 29 and exits from the nozzle 29. Since the diameter of the contact head 35 is smaller than the inner diameter of the nozzle 29, there is a gap between the nozzle 29 and the contact head 35. During this process, the piston disc 26 continues to compress the gas in the second insulating shell 24 cavity between itself and the plug 23, making it a high-pressure gas. That is, there is a pressure difference between the gas in the second insulating shell 24 cavities on the left and right sides of the piston disc 26. The high-pressure gas in the second insulating shell 24 cavity on the right side of the piston disc 26 (that is, the second insulating shell 24 cavity between the piston disc 26 and the plug 23) passes through the vent hole 38 on the moving main contact 27, the cavity of the moving main contact 27, and the cavity of the moving arc contact 28 to the cavity of the nozzle 29. Then, it flows into the second insulating shell 24 cavity on the left side of the piston disc 26 (that is, the cavity of the second insulating shell 24 between the piston disc 26 and the bottom of the second insulating shell 24) through the gap between the nozzle 29 and the contact head 35.In other words, the high-pressure airflow can blow towards the arc region between the stationary arc contact 31 and the moving arc contact 28 to extinguish the arc. As shown in Figures 9 and 10, as the moving conductive rod 12 and the moving conductive rod 15 continue to move to the right, until the moving end and the stationary end of the compressed air arc extinguishing chamber 25 are completely separated, the moving main contact 27 separates from the stationary main contact 30, the moving arc contact 28 separates from the stationary arc contact 31, and the contact head 35 of the stationary arc contact 31 completely retracts outside the nozzle 29. As the high-pressure gas flows from the right side chamber of the piston disc 26 of the second insulating housing 24 to the left side chamber, until the gas pressure in the chambers of the second insulating housing 24 on both sides of the piston disc 26 reaches equilibrium, there is no more gas flow. At this point, the circuit breaker is opened, and no current flows between the upper conductor 13 and the lower conductor 05.

[0050] The process of the load switch switching from open to closed is the reverse of the process of switching from closed to open, and will not be described again. It should be noted that when the load switch switches back and forth between closed and open, the grounding moving contact 11 is always separated from the grounding stationary contact 08.

[0051] During the process of the load switch from opening to closing, the moving end of the compressed air interrupter 25 moves closer to the stationary end, and the moving arc contact 28 and the stationary arc contact 31 first come into contact. At this time, the stationary arc contact 31 passes through the cylinder cavity of the nozzle 29 and comes into the cylinder cavity of the moving arc contact 28 near the nozzle 29. Then, the moving main contact 27 is inserted into the cylinder opening of the stationary main contact 30, realizing the connection between the moving main contact 27 and the stationary main contact 30. The moving end of the compressed air interrupter 25 continues to move closer to the stationary end, and the contact head 35 of the stationary arc contact 31 moves to the cylinder cavity of the moving arc contact 28 near the moving main contact 27. The stationary arc contact 31 and the moving arc contact 28 do not come into contact, while at the same time the moving main contact 27 is completely inserted into the cylinder cavity of the stationary main contact 30, realizing the complete closure of the moving main contact 27 and the stationary main contact 30.

[0052] During the process of the load switch closing from opening, when the moving arc contact 28 and the stationary arc contact 31 first come into contact, an electric arc is generated between them. This arc is extinguished by high-pressure airflow. At this time, the high-pressure airflow originates from the cavity of the second insulating housing 24 on the left side of the piston disc 26, passes through the gap between the nozzle 29 and the contact head 35 to the cavity of the nozzle 29, and then flows sequentially through the cavity of the moving arc contact 28, the cavity of the moving main contact 27, and the vent hole 38 on the moving main contact 27 into the cavity of the second insulating housing 24 on the right side of the piston disc 26. After the load switch closes, the air pressure in the cavities of the second insulating housing 24 on both sides of the piston disc 26 reaches equilibrium, and no more airflow occurs.

[0053] When the load switch performs a grounding operation, the moving end and stationary end of the compressed air arc-extinguishing chamber 25 are completely separated (as shown in Figure 9). Then, the grounding moving contact 11 is driven by the operating mechanism 01 to move to the left, that is, to move closer to the grounding stationary contact 08. Since the opening of the grounding stationary contact 08 is arranged facing the opening of the first insulating housing 10, and the grounding moving contact 11 is inserted into the cavity of the first insulating housing 10 from the opening of the first insulating housing 10, the grounding moving contact 11 can be inserted into the opening of the grounding stationary contact 08, thus achieving the connection between the two.

[0054] To ensure a smooth connection or separation between the moving grounding contact 11 and the stationary grounding contact 08, a guide groove is provided at the end of the moving grounding contact 11 that connects to the stationary grounding contact 08. This guide groove matches the end of the grounding guide rod 18 located inside the cavity of the stationary grounding contact 08. When the moving grounding contact 11 is inserted into the opening of the stationary grounding contact 08, the end of the grounding guide rod 18 located inside the cavity of the stationary grounding contact 08 inserts into the guide groove of the moving grounding contact 11 to guide the movement of the moving grounding contact 11, ensuring a smooth connection between the moving grounding contact 11 and the stationary grounding contact 08. After the moving grounding contact 11 is fully inserted into the cavity of the stationary grounding contact 08, the second spring contact finger 09 is arranged around and contacts the moving grounding contact 11. At this time, the moving grounding contact 11 is connected to the stationary grounding contact 08 via the second spring contact finger 09. The stationary grounding contact 08 is then connected to the flexible connection 16 via the rod-shaped part 19 of the conductive support 20. The flexible connection 16 is then connected to the lower conductor 05 via the conductive rod 39, thereby realizing the grounding operation. Of course, when changing the grounding state of the load switch to the ungrounded state, the moving grounding contact 11 is moved to the right by the operating mechanism 01, that is, moved away from the stationary grounding contact 08, until the moving grounding contact 11 separates from the stationary grounding contact 08. During this process, the grounding guide rod 18 can still guide the movement of the moving grounding contact 11, so that the moving grounding contact 11 and the stationary grounding contact 08 can be smoothly separated.

[0055] The present invention, an environmentally friendly pressurized solid insulating cylinder 02 and a load switch using it, differs from existing technologies in that it innovatively combines solid insulation with pressurized arc extinguishing (i.e., a compressed air arc extinguishing chamber 25 is installed inside the solid insulating cylinder 02). This integration of the advantages of both technologies, combining the miniaturized solid insulating cylinder 02 with pressurized arc extinguishing, achieves a "1+1>2" effect. The product's breaking and closing performance is more stable. Compared to traditional solid-insulated load switches, this invention can achieve opening and closing in a single operation, eliminating the need for energy storage. Compared to gas-insulated load switches, this invention has the advantage of miniaturization, and uses normal-pressure dry air as the insulation and breaking medium, eliminating the risk of air leakage and making it more environmentally friendly. Therefore, this invention truly achieves the goals of miniaturization, cost reduction, environmental friendliness, and high performance.

[0056] The core of this invention is the compressed air arc-extinguishing chamber 25 built into the insulating cylinder 02. When the load switch is opened, the piston disc 26 moves rapidly in the compressed air arc-extinguishing chamber 25, compressing the internal gas. The compressed high-pressure gas is sprayed at high speed through the nozzle 29 towards the electric arc generated when the moving and stationary contacts separate. This high-speed airflow has the following functions: (1) Cooling the electric arc: It carries away the heat generated by the separation of the moving and stationary contacts, reducing the temperature of the electric arc and the temperature of the moving and stationary contacts.

[0057] (2) Lengthen the electric arc: make the electric arc longer and thinner and reduce its energy.

[0058] (3) Deionization: accelerates the recombination speed of charged particles (electrons and positive ions) in the arc plasma, and increases the insulation strength of the medium.

[0059] (4) Physical dispersal: directly blow the high-temperature electric arc plasma away from the contact gap.

[0060] In this invention, high-speed airflow effectively cools and interrupts reignition or re-breakdown that may occur after capacitive current interruption, which is difficult for traditional load switches to safely achieve. This invention features a more robust contact system and a faster closing speed, enabling it to withstand enormous electrodynamic and thermal shocks when closing to a short-circuit fault, preventing contact welding or mechanical damage, whereas traditional switches typically have lower closing capabilities. This invention offers higher safety; its powerful internal arc-extinguishing capability confines arc energy within the arc-extinguishing chamber, significantly reducing the risk of arc ejection from the switch and causing fire or personal injury. The rapid and reliable arc-extinguishing capability also reduces the possibility of phase-to-phase short circuits due to prolonged arcing time. This invention encapsulates the compressed air arc-extinguishing chamber 25 within the first insulating shell 10 of the insulating cylinder 02 as a load switch solution. The surface of the insulating cylinder 02 is coated with a conductive layer and grounded, filling an industry gap and truly achieving a solution that integrates safety, miniaturization, low cost, and environmental friendliness.

[0061] During closing, the moving arc contact 28 and the stationary arc contact 31 first generate an arc. Since both the moving and stationary arc contacts 31 are made of special materials and processes, they possess higher thermal stability. This design primarily protects the moving and stationary main contacts 30 from damage during the closing process. The arc generated by the moving and stationary arc contacts 31 is quickly extinguished by the flowing airflow. This part of the design serves to extinguish the arc during closing. Then, the moving main contact 27 continues to move and contact the stationary main contact 30 to complete the closing process. The opening principle is the same as the closing principle, but the direction of movement is opposite. After the moving main contact 27 and the stationary main contact 30 separate first, the moving arc contact 28 and the stationary arc contact 31 separate, generating an arc. This arc is extinguished by the flowing airflow generated by the movement of the piston disc 26.

[0062] The present invention adopts a solid insulation design concept. The insulating cylinder 02 is miniaturized by using zinc spraying on its outer surface (that is, coating a conductive layer on the outer walls of the first insulating shell 10, the upper sleeve 03 and the lower sleeve 04, and zinc spraying is the same as coating a conductive layer). This allows the induced charge generated by the high voltage charged parts inside to be grounded and eliminated, making it safer to use.

[0063] The zinc-sprayed insulating cylinder 02, through its rational design and shielding measures, results in a more uniform internal electric field and more stable partial discharge indicators. Numerous shielding meshes are embedded within the insulating cylinder 02 to shield the uniform electric field, thus enhancing the overall electrical performance of the switch. The load switch mechanism and grounding mechanism are integrated, saving overall switch space and component costs. The mechanism adopts a modular design concept with four fixed installation points, facilitating installation and significantly reducing installation and commissioning costs.

[0064] To ensure the overall sealing of the switch, a mechanical sealing scheme is adopted. The operating mechanism 01 is sealed inside the mechanism box, and the secondary wires are led out through a sealed aviation plug and sealed by the mechanism box sealing plate. The connecting shaft adopts a dynamic sealing design concept. The overall protection level of the switch reaches IP67, minimizing the impact of environmental conditions on the electrical performance of the switch. The environmentally friendly booster solid-insulated load switch solution achieves true miniaturization and reduces product costs through effective insulation and shielding methods and advanced arc extinguishing concepts, while ensuring reliable product performance without pollution.

[0065] The openings of the first insulating shells 10 of the three environmentally friendly pressurized solid insulating cylinders 02 are all sealed to the mechanism box. To enhance the sealing performance, a sealing ring is provided between the opening of the first insulating shell 10 of each insulating cylinder 02 and the mechanism box. To enhance the sealing performance between the piston disc 26 and the cavity of the second insulating shell 24, a sealing ring is provided on the outer peripheral sidewall of the piston disc 26, which contacts the inner wall of the cavity of the second insulating shell 24. All of the above sealing rings can be made of rubber.

[0066] Both the load switch and the grounding switch adopt a direct-acting design, and the straight-cylinder design is conducive to heat dissipation.

[0067] In this invention, the first insulating shell 10, the upper sleeve 03 and the lower sleeve 04 are made of epoxy resin, the upper conductor 13, the conductive seat 32, the moving main contact 27, the stationary main contact 30, the stationary arc contact 31, the moving arc contact 28, the piston disc 26, the moving conductive rod 15, the conductive support seat 20, the flexible connection 16, the conductive rod 39, the lower conductor 05, the grounding stationary contact 08 and the grounding moving contact 11 are all made of metallic conductive materials, and the nozzle 29, the second insulating shell 24, the plug 23, the moving conductive rod pull rod 12 and the grounding guide rod 18 are all made of insulating materials.

[0068] After the moving main contact 27 is inserted into the cavity of the stationary main contact 30, in order to ensure good contact between the two, multiple tension springs 37 arranged circumferentially are provided at the opening of the stationary main contact 30. The tension springs 37 are made of metal material and can tightly wrap the moving main contact 27 (at this time, the multiple tension springs 37 abut against the outer wall of the moving main contact 27 circumferentially). In this way, the stationary main contact 30 can make good contact with the moving main contact 27 through the tension springs 37.

[0069] It should be noted that the terms "center", "upper", "lower", "front", "rear", "left", "right", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0070] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0071] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. An environmentally friendly pressurized solid insulating cylinder, characterized in that: The device includes a first insulating shell in the shape of a barrel. An upper conductor, a compressed air arc-extinguishing chamber, and a lower conductor are embedded in the bottom of the first insulating shell. The moving end of the compressed air arc-extinguishing chamber is arranged towards the opening of the first insulating shell and extends into the cavity of the first insulating shell. The stationary end of the compressed air arc-extinguishing chamber is located inside the bottom of the first insulating shell and is connected to one end of the upper conductor thereon. The other end of the upper conductor extends outside the first insulating shell. One end of the lower conductor is located inside the bottom of the first insulating shell and is connected to the moving end of the compressed air arc-extinguishing chamber. The other end of the lower conductor extends outside the first insulating shell. A grounding stationary contact is provided inside the cavity of the first insulating shell. The grounding stationary contact is located on the bottom of the first insulating shell and is connected to the end of the lower conductor located inside the bottom of the first insulating shell.

2. The environmentally friendly pressurized solid insulating cylinder according to claim 1, characterized in that: A conductive support seat is fitted onto the moving end of the compressed air arc-extinguishing chamber. A first spring contact finger is provided around the moving end of the compressed air arc-extinguishing chamber inside the conductive support seat. The first spring contact finger contacts the moving end of the compressed air arc-extinguishing chamber. A flexible connection is connected to the conductive support seat. Both the conductive support seat and the flexible connection are located on the bottom of the first insulating shell. A conductive rod is embedded in the bottom of the first insulating shell. One end of the conductive rod is located inside the bottom of the first insulating shell and is connected to one end of the lower conductor at that location. The other end of the conductive rod extends into the cavity of the first insulating shell and is connected to the flexible connection.

3. The environmentally friendly pressurized solid insulating cylinder according to claim 2, characterized in that: The grounding stationary contact is barrel-shaped, with its opening facing the opening of the first insulating shell. A second spring contact finger is arranged circumferentially inside the barrel cavity of the grounding stationary contact. A grounding guide rod is inserted through the bottom of the barrel. A first radial protrusion is provided on one end of the grounding guide rod located inside the barrel cavity of the grounding stationary contact. The other end of the grounding guide rod located outside the grounding stationary contact passes sequentially through a conductive support and a flexible connection before connecting to the bottom of the barrel of the first insulating shell. The flexible connection, the conductive support, and the bottom of the grounding stationary contact abut against the bottom of the barrel of the first insulating shell and the first radial protrusion.

4. The environmentally friendly pressurized solid insulating cylinder according to claim 3, characterized in that: The compressed air arc-extinguishing chamber includes a barrel-shaped second insulating shell, which is embedded in the bottom of a first insulating shell. The opening of the second insulating shell faces the opening of the first insulating shell. The stationary end of the compressed air arc-extinguishing chamber includes a conductive base, a stationary arc contact, and a stationary main contact. The conductive base is inserted into the bottom of the second insulating shell and connected to one end of the upper conductor located inside the bottom of the first insulating shell. The stationary main contact is barrel-shaped and located within the cavity of the second insulating shell, with its opening facing the opening of the second insulating shell. The stationary arc contact is rod-shaped and inserted into the bottom of the stationary main contact. Both the stationary main contact and the stationary arc contact are mounted on the conductive base. The moving end of the compressed air arc-extinguishing chamber includes a moving conductive rod, a moving main contact, a moving arc contact, and a nozzle. The opening of the second insulating shell... The device is equipped with a seal, and the moving conductive rod is inserted into the seal. One end of the moving conductive rod located inside the second insulating shell cavity is equipped with a moving main contact that can be inserted into or separated from the opening of the stationary main contact. The moving main contact is equipped with a moving arc contact that can be inserted into or separated from the end of the stationary arc contact located inside the stationary main contact cavity. The moving arc contact is equipped with a nozzle. A piston disc that can slide and seal along the cavity of the second insulating shell is fitted on the moving main contact. The moving main contact is equipped with a vent hole. One end of the vent hole is connected to the nozzle, and the other end of the vent hole is connected to the cavity of the second insulating shell between the piston disc and the seal. One end of the moving conductive rod located outside the second insulating shell is located inside the cavity of the first insulating shell and is equipped with a conductive support seat. The first spring contact finger is arranged around the moving conductive rod and contacts the moving conductive rod.

5. The environmentally friendly pressurized solid insulating cylinder according to claim 4, characterized in that: The stationary arc contact has a second radial protrusion on one end located inside the stationary main contact barrel cavity, and the other end of the stationary arc contact located outside the stationary main contact is connected to the conductive base. The bottom of the stationary main contact barrel abuts between the second radial protrusion and the conductive base.

6. The environmentally friendly pressurized solid insulating cylinder according to claim 5, characterized in that: The moving main contact, moving arc contact, and nozzle are all cylindrical. One end of the moving main contact is located on the end of the moving conductive rod inside the second insulating shell cavity. The other end of the moving main contact is connected to one end of the moving arc contact, and the other end of the moving arc contact is connected to one end of the nozzle. The other end of the nozzle is conical. The cavities of the moving main contact, moving arc contact, and nozzle are sequentially connected. One end of the vent hole is connected to the cavity of the moving main contact. The outer diameter of the moving main contact matches the inner diameter of the barrel opening of the stationary main contact. The inner diameter of the nozzle is larger than the diameter of the end of the stationary arc contact located inside the cavity of the stationary main contact. The end of the stationary arc contact located inside the cavity of the stationary main contact can pass through the nozzle and be inserted into or separated from the cavity of the moving arc contact.

7. The environmentally friendly pressurized solid insulating cylinder according to claim 6, characterized in that: The bottom of the first insulating shell is provided with an upper sleeve and a lower sleeve extending away from the first insulating shell. The upper sleeve and the lower sleeve are respectively located on opposite sides of the first insulating shell. The upper conductor is nested in the upper sleeve, and the end of the upper conductor that is not connected to the stationary end of the compressed air arc-extinguishing chamber extends along the upper sleeve to the outside of the upper sleeve. The lower conductor is nested in the lower sleeve, and the end of the lower conductor that is not connected to the moving end of the compressed air arc-extinguishing chamber extends along the lower sleeve to the outside of the lower sleeve.

8. The environmentally friendly pressurized solid insulating cylinder according to claim 7, characterized in that: The upper sleeve has a first shielding mesh inside its cylinder wall, the lower sleeve has a second shielding mesh inside its cylinder wall, the bottom of the first insulating shell has a third shielding mesh and a fourth shielding mesh, the third shielding mesh is located outside the connection between the stationary end of the compressed air arc extinguishing chamber and the upper conductor, the fourth shielding mesh is located outside the connection between the conductive rod and the lower conductor, and the first insulating shell has a fifth shielding mesh inside its cylinder wall.

9. The environmentally friendly pressurized solid insulating cylinder according to claim 8, characterized in that: The outer wall of the first insulating shell is coated with a conductive layer, and the outer walls of the upper sleeve and the lower sleeve are coated with conductive layers.

10. A load switch using the environmentally friendly booster-type solid insulating cylinder according to any one of claims 1-9, characterized in that: The device includes an operating mechanism, on which three environmentally friendly pressurized solid insulating cylinders are sealed and connected. The opening of the first insulating shell of each environmentally friendly pressurized solid insulating cylinder is sealed and connected to the operating mechanism. The operating mechanism is equipped with three moving conductive rods and three grounding moving contacts. The three moving conductive rods are respectively connected to the moving conductive rods in the three environmentally friendly pressurized solid insulating cylinders. The three grounding moving contacts can be connected to or disconnected from the grounding stationary contacts in the three environmentally friendly pressurized solid insulating cylinders.

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