Rotary and direct-acting combined compression environmental gas load switch cabinet

Abstract

The present application relates to a kind of rotary, direct-drive combined gas environmental protection gas load switch cabinet, including sealed gas chamber, cable chamber and mechanism control chamber, the sealed gas chamber includes gas tank and pressure relief device, three-phase three-position combination switch is installed in the gas tank, the gas tank is fully sealed structure and is filled with environmental protection insulation gas;Any three-phase three-position combination switch includes gas cylinder type movable contact seat and piston movable contact of gas cylinder structure, static contact, grounding static contact and crank arm, one end of the movable contact seat is fixed, the crank arm first end and the contact end of movable contact two sides are connected with connecting rod, the operating mechanism is connected with the crank arm second end by transmission shaft, drive the crank arm rotation, at the same time, movable contact is made linear motion in movable contact seat, realize the closing, opening and grounding operation of three-phase three-position combination switch.Beneficial effect is based on the connecting rod combination of crank arm rotation and gas cylinder direct-drive, simple structure, easy operation.

Description

Technical field

[0001] The present invention relates to the technical field of power distribution appliances, and in particular to a rotary and direct-acting combined compressed air type environmentally friendly gas load switch cabinet. [Background Technology]

[0002] Currently, widely used distribution switchgear (cabinets) include load switches (cabinets), combination electrical appliances (cabinets), and circuit breakers (cabinets). To improve insulation and interrupting performance, SF6 (sulfur hexafluoride) gas is often used as the insulating and interrupting medium. SF6's excellent insulation and arc-extinguishing properties, combined with a fully sealed and fully insulated design, protect insulation and interrupting functions from environmental influences. Furthermore, SF6 is compact, easy to install and use, and more economical and reliable than conventional switchgear, making it widely used in medium-voltage distribution systems and on the user side. However, SF6 is a synthetic gas with a strong greenhouse effect, approximately 23,900 times that of CO2 (carbon dioxide). Furthermore, it is difficult to participate in natural cycles and persists in the atmosphere for up to 3,200 years. Long-term use and emissions of SF6 will inevitably lead to serious consequences.

[0003] To this end, the world is working hard to find an ideal alternative gas to SF6, but so far this goal is still not ideal; at the same time, other solutions are also being actively pursued, such as the use of traditional gas production, compressed gas or a combination of arc extinguishing methods, or the use of solid insulation, atmospheric pressure air insulated load switches (cabinets), etc., as well as the use of nitrogen, dry air or other environmentally friendly gas insulation + vacuum opening and closing unit technical routes and structural methods like environmentally friendly gas insulated inflatable cabinets. These have been studied and applied to a certain extent, but also bring other problems, such as gas production and compressed gas not only have large size and space requirements but are also not conducive to sealed environment applications, and arc decomposition products will affect the electrical life; the epoxy resin used in solid insulation cabinets is itself a difficult-to-degrade material, and the treatment and degradation of waste epoxy resin after large-scale use will become an environmental problem; atmospheric pressure air The insulation is not actually fully sealed insulation, and will still be affected to varying degrees by condensation and atmospheric pollution after long-term operation; although the environmentally friendly gas insulation + vacuum opening and closing unit method is reasonable, the current structure generally uses the circuit breaker cabinet structure of SF6 gas insulation + vacuum opening and closing unit, that is, the disconnector (or three-position switch) adopts a knife type, and is independent of the vacuum opening and closing unit, and the operating mechanism is also equipped separately, making the structure of the load switch (cabinet) like that of the circuit breaker (cabinet), or even it can be said that the circuit breaker (cabinet) is used as a load switch (cabinet), and the disconnector (or three-position switch) generally uses a knife type, which is not conducive to electric field optimization and volume reduction, nor is it conducive to improving the actuation and thermal tolerance levels. Therefore, the structure and function are repeated, the operation is complicated, and the cost is high, which affects its promotion and application in the fields of power distribution and new energy.

[0004] The present invention improves the environmental protection gas load switch cabinet by combining a rotary and direct-acting combination with a compressed air type and a deionized grid, and using a comprehensive arc extinguishing technology with a common set of moving contacts, main contacts and arc contacts. [Summary of the invention]

[0005] The object of the present invention is to provide an environmentally friendly gas load switch cabinet which is simple in structure, easy to operate and low in cost and which is based on a connecting rod combination of crank arm rotation and gas cylinder direct motion.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is a rotary, direct-acting combined compressed air type environmentally friendly gas load switch cabinet, comprising a sealed gas chamber, a cable chamber, and a mechanism control chamber, wherein the sealed gas chamber comprises an air box and a pressure relief device installed outside the air box, and a three-phase three-position combination switch installed inside the air box, wherein the air box is a fully sealed structure and is filled with environmentally friendly insulating gas; the cable chamber comprises a cable bushing for cable connection; the mechanism control chamber comprises an operating mechanism for electrical, mechanical control and interlocking; the air box also comprises a busbar, a connecting conductor and a busbar bushing passing through the air box, the three-phase three-position combination switch is connected to the busbar through the busbar bushing to realize the expansion of the busbar between cabinets, and the The three-phase three-position combination switch is connected to the cable bushing by connecting the conductor to realize cable connection; any of the three-phase three-position combination switches includes a cylinder-type movable contact seat and a piston-type movable contact, a static contact, a grounding static contact and a crank arm of a gas cylinder structure, one end of the movable contact seat is fixed, the first end of the crank arm and the two sides of the contact end of the movable contact are connected in a connecting rod manner, the operating mechanism is connected to the second end of the crank arm through a transmission shaft, and drives the crank arm to rotate while driving the movable contact to move linearly in the movable contact seat, controlling the closing and opening of the movable contact and the static contact, and controlling the opening and closing of the movable contact and the grounding static contact, thereby realizing the closing, opening and grounding operations of the three-phase three-position combination switch.

[0007] Furthermore, the moving contact includes a contact tube, a honeycomb-shaped moving arc contact fixed at one end of the contact tube, a nozzle and a crank arm seat, and a piston fixed at the other end of the contact tube; the static contact includes a static main contact, a static contact spring, a pointed rod-shaped static arc contact, a buffer pad arranged on the front of the static arc contact, and a deionization grid arranged on the back of the static arc contact; the static arc contact and the static main contact are coaxially fixed on the wiring copper busbar, and the static arc contact is axially higher than the static main contact, the static main contact is a cup-shaped cylindrical structure, the cup bottom is fixed to the wiring copper busbar, and the cup mouth is a petal contact, which forms a sliding electrical contact with the moving contact under the tightening stress of the static contact spring; the The contact tube, the moving arc contact, the nozzle, the piston and the crank arm seat are coaxially fixed, and the crank arm seat is rotatably connected to the first end of the crank arm through two symmetrically arranged shaft protrusions. The moving arc contact is fixed in the contact tube and axially higher than the contact tube but lower than the nozzle; when the piston-type moving contact and the static contact are separated, the static main contact and the contact tube are separated first, and the static arc contact and the moving arc contact are separated later, and the arc is extinguished by the nozzle and the deionization grid; when the piston-type moving contact and the static contact are closed, the static arc contact is first inserted into the moving arc contact, and the contact tube is inserted into the static main contact later, and the impact is buffered by the nozzle and the buffer pad.

[0008] Furthermore, any of the three-phase three-position combination switches also includes a metal base frame, two insulating support plates, an insulating seat, and a grounding short-circuit copper bar; the cylinder-type moving contact seat and the piston-type moving contact of the air cylinder structure are fixed in the middle of the metal base frame by the insulating support plate, and together with the axial hole of the metal base frame, the transmission shaft passes through the second end of the crank arm to drive the crank arm to rotate; the static contact is fixed to the upper side of the metal base frame through the insulating seat, the static arc contact is lower than the outer bell cover of the insulating seat, so that the static contact is placed in the outer bell cover of the insulating seat, and the deionization grid is installed in the insulating seat; the grounding static contact is directly fixed to the lower side of the metal base frame together with the grounding short-circuit copper bar; the rotation of the crank arm causes the moving contact to contact and connect with the static contact when it is in the closed position, the rotation of the crank arm causes the moving contact to contact and connect with the grounding static contact when it is in the ground position, and the rotation of the crank arm causes the crank arm and the air cylinder structure to be in a straight line when it is in the open position.

[0009] Furthermore, the dynamic contact seat includes an air cylinder, a fixed seat, a bus, a drain bar, a dynamic contact tube, a contact spring, a cylinder, and a spring; the dynamic contact tube is a cylindrical structure, one end of which is fixed in the air cylinder, and the other end is made into a petal contact, which forms a sliding electrical contact with the dynamic contact under the tightening stress of the contact spring; the piston slides up and down in the air cylinder and the dynamic contact tube to form a compressed air cylinder structure, which compresses the gas in the air cylinder to blow out the arc through the nozzle when opening the switch and cushion the impact when closing the switch; the air cylinder is made of insulating material and consists of two large cylinders with orthogonal axes. and a small cylinder, the small cylinder is fixed coaxially with the cylinder and rotates with the cylinder, one end of the large cylinder is connected to the moving contact tube, and the end face of the other end is closed; the moving contact tube uses the cylinders on both sides as the rotation axis, and the spring is installed between the concave hole of the cylinder and the bus, so that the moving contact tube and the bus on both sides form a rotating electrical contact through the cylinder and the spring, and at the same time, the moving contact tube and the contact tube form a linear sliding electrical contact, so that the moving contact rotates with the cylinders on both sides as the axis and performs linear motion guided by the moving contact tube to form a conductive circuit.

[0010] Preferably, the fixing seat is provided with a closing limit for limiting the closing action of the moving contact and the static contact, and a grounding limit for limiting the grounding action of the moving contact and the grounding static contact.

[0011] Preferably, the ends of the static arc contact and the moving arc contact are both made of arc-resistant materials; the deionization grid is composed of a number of parallel arranged bent steel plates and a filter screen, the bent steel plates are arranged with a number of turbulent punchings, insulated from each other and maintaining an air gap spacing, the filter screen is a metal mesh with a grid density, fixed on the top of the deionization grid; the junction of the insulating seat, the wiring copper busbar, and the static main contact is arranged with honeycomb vents for guiding high-temperature arc gas to the deionization grid for cooling and filtering.

[0012] Preferably, the moving contact, the moving arc contact, the static contact, the static arc contact, the grounding static contact, and the moving contact tube all adopt cylindrical, cylindrical, round head structures and combinations, and the electrical contact method between them is a coaxial circular sliding electrical contact method; the insulating support plate, the fixing seat, and the insulating seat are cast with solid insulating material and formed as a whole.

[0013] Preferably, the grounding static contact includes a grounding static main contact, a grounding static contact spring, a pointed rod-shaped grounding static arc contact, and a grounding buffer pad arranged on the front of the static arc contact; the grounding static arc contact and the grounding static main contact are coaxially fixed on the grounding short-circuit copper busbar, and the grounding static arc contact is axially higher than the grounding static main contact. The grounding static main contact is a cup-shaped cylindrical structure, the cup bottom is fixed to the grounding short-circuit copper busbar, and the cup mouth is a petal contact, which forms a sliding electrical contact with the moving contact under the tightening stress of the grounding static contact spring.

[0014] Preferably,

[0015] When the moving contact starts to move apart from the closed position under the drive of the crank arm, on the one hand, the moving contact and the moving contact tube rotate together with the cylinders on both sides as axes, and on the other hand, the moving contact and the moving contact tube move linearly relative to each other. At the same time, the static arc contact blocks the nozzle at the beginning of the opening stage, and the piston pre-compresses the gas in the gas cylinder until the nozzle and the static arc contact are separated. After the separation, the pre-compressed gas and the gas compressed by the piston as the moving contact continues to move apart blow out the arc through the nozzle, and as the moving contact and the static contact continue to separate rapidly, they finally reach and stay in the open position.

[0016] When the moving contact starts to close from the open position under the drive of the crank arm, on the one hand, the moving contact quickly approaches the static contact during rotation and linear motion. When the static arc contact is inserted into the nozzle, the nozzle is blocked so that the piston compresses the gas in the gas cylinder to cushion the closing impact of the moving contact, so that the moving contact smoothly reaches and stays in the closed position under the joint restriction of the buffer pad and the closing limit.

[0017] When the moving contact starts to move apart from the ground position under the drive of the crank arm, on the one hand, the moving contact and the moving contact tube rotate together with the cylinders on both sides as axes, and on the other hand, the moving contact and the moving contact tube move linearly relative to each other. At the same time, the grounding static arc contact blocks the nozzle at the beginning of the opening phase, and the piston pre-compresses the gas in the gas cylinder until the nozzle and the grounding static arc contact are separated and after separation, and as the moving contact and the grounding static contact continue to separate rapidly, they finally reach and stay in the opening position;

[0018] When the moving contact starts to move from the split position under the drive of the crank arm, on the one hand, the moving contact quickly approaches the grounding static contact during rotation and linear motion. When the grounding static arc contact is inserted into the nozzle, the nozzle will be blocked so that the piston compresses the gas in the gas cylinder to cushion the closing impact of the moving contact, so that the moving contact smoothly reaches and stays at the ground position under the joint restriction of the buffer pad and the grounding limit.

[0019] Preferably, the grounding static contact is arranged on the upper side of the metal chassis, the grounding static contact is arranged on the lower side of the metal chassis, or only the static contact is arranged, or only the grounding static contact is arranged; the busbar sleeve is an inner taper type, is installed on the upper side of the sealed gas chamber, and realizes the connection and expansion of the busbar between switch cabinets through a busbar connector; or, the busbar sleeve is an outer taper type, is installed on the top of the sealed gas chamber, and realizes the connection and expansion of the busbar between switch cabinets through an insulating busbar.

[0020] The rotary and straight motion combined pressurized environmentally-friendly gas load switch cabinet has the following beneficial effects: the combined switch is composed of a rotary and straight motion combined and pressurized and deionization grid combined load switch and grounding switch, and shares a set of moving contacts, adopts main contacts and arc contacts to separate operation and uses a deionization grid for comprehensive arc extinguishing; the operating mechanism drives the moving contacts to rotate and move linearly through a transmission shaft and a crank arm, and forms the closing and opening of the load switch with the static contacts, and forms the opening and grounding of the grounding switch with the grounding static contacts, so as to realize the closing and opening (isolation) and grounding functions of the load switch cabinet, thereby realizing the environmental protection of the power distribution switch cabinet, improving the electrical life, simplifying the structure and operation through the function combination, and improving the product reliability and reducing the product cost. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a three-dimensional perspective view of a rotary and straight motion combined pressurized environmentally-friendly gas load switch cabinet.

[0022] Figure 2 It is a left view of a rotary and straight motion combined pressurized environmentally-friendly gas load switch cabinet hidden behind the left side plate of the sealed gas chamber 1, the cable chamber 2 and the mechanism control chamber 3.

[0023] Figure 3 It is an A-A sectional view of a rotary and straight motion combined pressurized environmentally-friendly gas load switch cabinet.

[0024] Figure 4 It is an I partial enlarged view of a rotary and straight motion combined pressurized environmentally-friendly gas load switch cabinet.

[0025] Figure 5 It is an II partial enlarged view of a rotary and straight motion combined pressurized environmentally-friendly gas load switch cabinet.

[0026] Figure 6 It is an III partial enlarged view of a rotary and straight motion combined pressurized environmentally-friendly gas load switch cabinet.

[0027] Figure 7 It is a closing state schematic view of a rotary and straight motion combined pressurized environmentally-friendly gas load switch cabinet hidden behind the back plate of the sealed gas chamber 1.

[0028] Figure 8 The present invention is a schematic diagram of the opening state of a rotary and direct-acting combined compressed air type environmentally friendly gas load switch cabinet, which hides the rear plate of the sealed gas chamber 1.

[0029] Figure 9 The present invention is a schematic diagram of the grounding state of a rotary and direct-acting combined compressed air type environmentally friendly gas load switch cabinet, with the sealed gas chamber 1 rear panel hidden.

[0030] The reference numerals and components involved in the drawings are as follows: 1. Sealed air chamber, 2. Cable chamber, 3. Mechanism control room, 4. Gas box, 5. Pressure relief device, 6. Combination switch, 601. Load switch, 602. Earthing switch, 7. Cable bushing, 8. Operating mechanism, 9. Busbar, 10. Connecting bar, 11. Busbar bushing, 12. Connecting conductor, 13. Transmission shaft, 14. Crank arm, 21. Metal chassis, 22. Moving contact seat, 23. Moving contact, 24. Insulating support plate, 25. Insulating seat, 26. Static contact, 27. Grounding static contact, 28. Grounding shorting copper bar, 31 , fixed seat, 311, closing limit, 312, grounding limit, 32, bus, 33, drain bar, 34, moving contact tube, 35, contact spring, 36, cylinder, 37, air cylinder, 38, spring, 41, contact tube, 42, moving arc contact, 43, nozzle, 44, crank arm seat, 45, piston, 51, wiring copper bus, 52, static main contact, 53, static arc contact, 54, buffer pad, 55, deionization grid, 551, bent steel plate, 552, filter, 56, static contact spring, 61, load switch operating hole, 62, grounding switch operating hole, 63, output shaft. [Specific implementation method]

[0031] The present invention will be further described below in conjunction with embodiments and with reference to the accompanying drawings.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0033] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0034] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0035] Example

[0036] This embodiment realizes a rotary and direct-acting combined compressed air type environmentally friendly gas load switch cabinet.

[0037] This embodiment provides a rotary and direct-acting combined compressed air type environmentally friendly gas load switch cabinet, in which the load switch of the three-phase three-position combination switch is arranged vertically and the grounding switch is arranged horizontally, and the two share the same set of moving contacts, main contacts and arcing contacts for separation.

[0038] Figure 1 This is a three-dimensional view of a rotary and direct-acting combined compressed air type environmentally friendly gas load switch cabinet. Figure 1 As shown, this embodiment shows a three-phase, three-position, combined rotary and direct-acting compressed air environmentally friendly gas load switchgear (hereinafter referred to as the switchgear). The switchgear comprises a sealed air chamber 1, a cable chamber 2, and a mechanism control chamber 3. The front panel of the mechanism control chamber 3 is provided with a load switch operating hole 61 and a grounding switch operating hole 62.

[0039] Figure 2 This is a left view of the left side of the left panel of a rotary and direct-acting compressed air type environmentally friendly gas load switch cabinet, which hides the sealed air chamber 1, cable chamber 2, and mechanism control chamber 3. Figure 2As shown, this embodiment is a rotary, direct-acting combined compressed air type environmentally friendly gas load switch cabinet. The sealed air chamber 1 is located at the upper rear part of the cabinet and is completely sealed. The sealed air chamber 1 contains an air box 4 and a combination switch 6, etc. and is filled with environmentally friendly gas (such as dry air, nitrogen, etc.); the combination switch 6 is a three-phase structure, namely phase A, phase B, and phase C.

[0040] Figure 3 This is a sectional view of the AA direction of a rotary and direct-acting combined compressed air type environmentally friendly gas load switch cabinet. Figure 2 , Attachment Figure 3 As shown, on the upper side of the combination switch 6 of this embodiment, the busbar 9 is connected through busbar bushings 11 on both sides to achieve busbar extension between cabinets. The lower side of the combination switch 6 is connected to the cable bushing 7 via a connecting conductor 12 to achieve cable connection. The front side of the combination switch 6 is connected to the output shaft 63 of the operating mechanism 8 via a transmission shaft 13. The cable chamber 2 is located at the lower part of the cabinet and contains the cable bushing 7 for cable connection. The mechanism control chamber 3 is located at the upper front part of the cabinet and contains the operating mechanism 8 and its electrical, mechanical control and interlocking devices.

[0041] As attached Figure 2 , attached Figure 3 As shown, the sealed air chamber 1 includes an air box 4, a pressure relief device 5 installed outside the air box 4, and a three-phase three-position combination switch 6 installed inside the air box 4. The air box 4 is a fully sealed structure and is filled with environmentally friendly gas. The combination switch 6 consists of a rotary and direct-acting combined compressed air load switch 601 and an earthing switch 602. The cable chamber 2 includes a cable bushing 7 for cable connection. The mechanism control chamber 3 includes an operating mechanism 8 for electrical and mechanical control and interlocking. The air box 4 also includes a busbar 9, a connecting bar 10, and a busbar bushing 11 passing through the air box. The combination switch 6 is connected to the busbar through the busbar bushing 11 to achieve busbar extension between cabinets. The combination switch 6 is connected to the cable bushing 7 through a connecting conductor 12 to achieve cable connection. The operating mechanism 8 controls the closing and opening of the load switch 601 and the opening and closing of the earthing switch 602 via a transmission shaft 13 and a crank arm 14, thereby achieving closing, opening, and earthing of the load switch cabinet.

[0042] Figure 4 It is a rotary and direct-acting combined compressed air type environmentally friendly gas load switch cabinet I. Partial enlarged view. Figure 5 It is a partial enlarged view of a rotary and direct-acting combined compressed air type environmentally friendly gas load switch cabinet II. Figure 6 This is a partial enlarged view of a rotary and direct-acting combined compressed air type environmentally friendly gas load switch cabinet III. Figure 1 , Attachment Figure 2 , Attachment Figure 3 , Attachment Figure 4 , Attachment Figure 5 , Attachment Figure 6 As shown in FIG. 1 , this embodiment is a rotary and direct-acting combined compressed air type environmentally friendly gas load switch cabinet, wherein the combination switch 6 comprises a metal chassis 21, a moving contact seat 22, a moving contact 23, insulating support plates 24 on both sides of the moving contact 23, an insulating seat 25, a static contact 26, a grounding static contact 27, a grounding shorting copper bar 28, the transmission shaft 13 and the crank arms 14 on both sides of the moving contact 23. As shown in FIG. Figure 4 , Attachment Figure 6 As shown, the movable contact seat 22 includes a fixed seat 31 integrated or fixed with one end of the insulating support plate 24, a bus bar 32, a drain bar 33, a movable contact tube 34, a contact spring 35, a cylinder 36, an air cylinder 37, and a spring 38. Figure 4 , Attachment Figure 5 As shown, the moving contact 23 includes a contact tube 41, a moving arc contact 42 fixed at one end of the contact tube 41, a nozzle 43 and a crank arm seat 44, and a piston 45 fixed at the other end of the contact tube 41. Figure 3 , Attachment Figure 5 As shown, the static contact 26 includes a copper bus 51, a static main contact 52, a static arc contact 53, a static contact spring 56, a buffer pad 54 and a deionization grid 55; Figure 3 As shown, the grounding static contact 27 includes the same grounding static main contact, grounding static arc contact, grounding static contact spring and grounding buffer pad as the static contact 26; Figure 1 , Attachment Figure 2 As shown, the front of the operating mechanism 8 includes the operating hole 61 of the load switch 601, the operating hole 62 of the grounding switch 602, and the output shaft 63 at the rear.

[0043] As attached Figure 1 , Attachment Figure 2 , Attachment Figure 3As shown, this embodiment is a rotary and direct-acting combined compressed air environmental protection gas load switch cabinet. The front of the operating mechanism 8 has a load switch operating hole 61 and a grounding switch operating hole 62 for manual operation, corresponding to the operation of the load switch 601 and the grounding switch 602, respectively. There is an output shaft 63 at the back, and the output shaft 63 is connected to the transmission shaft 13 for transmission; during operation, the operating mechanism 8 first stores energy, and when it reaches the inflection point, it quickly releases energy through the output shaft 63 to drive the transmission shaft 13 and the crank arm 14 to drive the moving contact 23 to move rapidly; the moving contact 23 rotates and moves linearly on the upper part of the insulating support plate 24 under the drive of the crank arm 14, and constitutes the closing and opening (isolation) of the load switch 601 with the static contact 26, and moves under the insulating support plate 24, and constitutes the grounding and opening (isolation) of the grounding switch 602 with the grounding static contact 27, thereby realizing the closing, opening (isolation) and grounding functions of the load switch cabinet.

[0044] like Figure 3 、 Figure 4 、 Figure 5 、 Figure 6As shown, this embodiment is a rotary and direct-acting combined compressed air type environmentally friendly gas load switch cabinet, the static contact 26 is fixed to the upper side of the metal base 21 through the insulating seat 25, the static arc contact 53 and the static main contact 52 are coaxially fixed on the wiring copper bus 51, and the static arc contact 53 is axially higher than the static main contact 52 by a certain distance, but lower than the outer edge bell cover of the insulating seat 25 by a certain distance, so that the static contact 26 is placed in the outer edge bell cover of the insulating seat 25; the static main contact 52 is a cup-shaped cylindrical structure, the cup bottom is fixed to the wiring copper bus 51, and the cup mouth is a petal contact, under the tightening stress of the static contact spring 56, or a self-powered contact is selected, it forms a contact with the moving contact 23. Sliding electrical contact; the grounding static contact 27 is directly fixed to the lower side of the metal chassis 21 together with the grounding short-circuit copper bar 28; the ends of the static arc contact 53 and the moving arc contact 42 are both made of arc-resistant materials (such as tungsten or copper-tungsten alloy, etc.); the moving contact seat 22 is located in the middle of the load switch 601 and the grounding switch 602, and is fixed to the middle of the metal chassis 21 by the insulating support plates 24 on both sides. One end of the fixing seat 31 is connected to or fixed to the insulating support plate, and the other end is fixed to the metal chassis 21, and together with the axial hole of the metal chassis 21, the transmission shaft 13 passes through to drive the crank arm 14 to realize three-phase linkage; the moving contact tube 34 is a cylindrical structure, one end of which is fixed to The other end of the air cylinder 37 is made into a petal contact, which forms a sliding electrical contact with the moving contact 23 under the tightening stress of the contact spring 35, or a self-powered contact is selected; the air cylinder 37 is made of insulating material and consists of a large and a small cylinder with two orthogonal axes. The small cylinder is coaxially fixed with the cylinder 36 and rotates with the cylinder 36. One end of the large cylinder is connected to the moving contact tube 34 and the end face of the other end is closed; the moving contact tube 34 uses the cylinders 36 on both sides as the rotation axis, and the spring 38 is installed between the concave hole of the cylinder 36 and the bus 32, so that the moving contact tube 34 and the bus 32 on both sides form a rotating electrical contact through the cylinder 36 and the spring 38. At the same time, the moving contact tube 34 forms linear sliding electrical contact with the contact tube 41, causing the movable contact 23 to rotate about the cylinders 36 on both sides and to perform linear motion guided by the movable contact tube 34, thereby forming a conductive circuit. The contact tube 41, the moving arc contact 42, the nozzle 43, the piston 45, and the crank arm seat 44 are coaxially fixed. The moving arc contact 42 is fixed within the contact tube 41 and axially protrudes a certain distance above the contact tube 41 but is lower than the nozzle 43 by a certain distance. The piston 45 slides up and down within the gas cylinder 37 and the movable contact tube 34, forming a gas cylinder structure for the movable contact 23. By compressing the gas in the gas cylinder 37, the gas is blown out through the nozzle 43 during opening and cushions the impact during closing.The crank arms 14 on either side of the moving contact 23 are fixedly connected to the drive shaft 13 at one end and rotatably connected to symmetrical protrusions on either side of the crank arm seat 44 at the other end. The fixed seat 31 has a closing limiter 311 and a grounding limiter 312. The holes connecting the crank arms 14 to the protrusions on either side of the crank arm seat 44 are defined, ensuring better contact between the contact tube 41 and the static main contact 52. The deionization grid 55 is mounted within the insulating seat 25 and consists of several parallel bent steel plates 551 and a filter screen 552. It is mounted above the static contact 26. Each bent steel plate 551 is provided with several turbulent perforations, insulated from each other and maintaining a certain air gap. The filter screen 552 is a metal mesh with a predetermined mesh density and is fixed to the top of the deionization grid 55.

[0045] like Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 As shown, this embodiment is a rotary and direct-acting combined compressed air type environmentally friendly gas load switch cabinet, wherein the moving contact 23, the moving arc contact 42, the static contact 26, the static arc contact 53, the grounding static contact 27, and the moving contact tube 34 all adopt cylindrical, cylindrical, round head structures and their combinations, and the electrical contact between them is a coaxial circular sliding electrical contact; the insulating support plate 24, the fixing seat 31, and the insulating seat 25 are cast with solid insulating material and formed as a whole; the joints of the insulating seat 25, the wiring copper bus 51, and the static main contact 52 are all arranged with certain honeycomb-shaped ventilation holes to guide the high-temperature arc gas to the deionization grid 55 for cooling and filtration.

[0046] Figure 7 The present invention is a schematic diagram of the closing state of a rotary and direct-acting combined compressed air type environmentally friendly gas load switch cabinet with a hidden sealed gas chamber 1 rear plate. Figure 8 The present invention is a schematic diagram of the opening state of a rotary and direct-acting combined compressed air type environmentally friendly gas load switch cabinet, which hides the rear plate of the sealed gas chamber 1. Figure 9 This is a schematic diagram of the grounding state of a rotary and direct-acting combined compressed air type environmentally friendly gas load switch cabinet hidden behind the rear plate of the sealed air chamber 1. Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9As shown, this embodiment is a rotary and direct-acting combined compressed air type environmentally friendly gas load switch cabinet. The moving contact 23 starts the opening of the load switch 601 from the closed position under the drive of the crank arm 14. On the one hand, the moving contact 23 and the moving contact tube 34 rotate together with the cylinders 36 on both sides as the axis. On the other hand, the moving contact 23 and the moving contact tube 34 move linearly relative to each other. The static main contact 52 is first separated from the contact tube 41. At the same time, the static arc contact 53 blocks the nozzle 43 at the beginning of the opening. The piston 45 pre-compresses the gas in the gas cylinder 37 until the nozzle 43 is separated from the static arc contact 53 and after the separation, the pre-compressed gas and the piston 45 continue to move with the moving contact 23 to extinguish the arc through the nozzle 43. As the moving contact 23 and the static contact 26 continue to separate rapidly, they finally reach the closed position. and stays in the open position; when the moving contact 23 starts to close the load switch 601 from the open position under the drive of the crank arm 14, the moving contact 23 also quickly approaches the static contact 26 during rotation and linear motion. Before the contact tube 41 inserts into the static main contact 52, the static arc contact 53 is first inserted into the nozzle 43, thereby blocking the nozzle 43 and causing the piston 45 to compress the gas in the gas cylinder 37 to buffer the closing impact of the moving contact 23, so that the moving contact 23 smoothly reaches and stays in the closed position under the combined restriction of the buffer pad 54 and the closing limit 311; when the moving contact 23 performs grounding and opening of the grounding switch 602 under the drive of the crank arm 14, the closing and opening process is the same as that of the load switch 601, except that the movement direction of the moving contact 23 is different and the closing limit 311 becomes the grounding limit 312.

[0047] like Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9As shown, when the moving contact 23 is in the closed position of the load switch 601, the sliding contact between the contact tube 41 and the static main contact 52 is the main conductive circuit, and the sliding contact between the moving arc contact 42 and the static arc contact 53 is the auxiliary arc burning circuit, thereby improving the reliability and electrical life of the load switch 601; in time-sharing, due to the relative axial protrusion of the moving arc contact 42 and the static arc contact 53, they separate later. When and after the static main contact 52 separates from the contact tube 41, the arc burns between the two and is blown out by the combined action of the compressed gas generated in the separation process and the nozzle 43. The high-temperature arc gas will be constrained by the bell jar on the outer edge of the insulating seat 25 and reach the deionization grid 55 upward to be further cooled and filtered, thereby reducing the phase influence and gas pollution. During closing, the moving arc contact 42 and the static arc contact 53 are higher in relative axial direction and contact earlier, so the arc will first be generated between them before they contact each other and extinguished after they contact each other. Then the contact tube 41 contacts the static main contact 52, thereby completing the current closing and closing. During the closing and opening process, the insulating seat 25 and the deionizing grid 55 are separated by the chimney effect of the bell jar on the outer edge of the insulating seat 25, and the high-temperature arc gas is absorbed and discharged, and the deionizing grid 55 is cooled and filtered, thereby reducing arc pollution and interphase influence. When the moving contact 23 is driven by the crank arms 14 on both sides to ground and open the grounding switch 602, the closing and opening process is the same as that of the load switch 601, except that the movement direction of the moving contact 23 is different.

[0048] Furthermore, the load switch 601 and the grounding switch 602 of the combination switch 6 can be used in combination as needed, such as a grounding switch above the load switch, or both the upper and lower parts are load switches or grounding switches, or can be simplified to a single load switch or grounding switch for independent use; the busbar bushing 11 is inner conical, installed on the upper side of the sealed air chamber 4 and realizes the connection and extension of the busbar between switch cabinets through a busbar connector; or the busbar bushing 11 is outer conical, installed on the top outside of the sealed air chamber 4 and realizes the connection and extension of the busbar between switch cabinets through an insulating busbar.

[0049] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and supplements without departing from the principles of the present invention. These improvements and supplements should also be regarded as the scope of protection of the present invention.

Claims

1. A rotary and direct-acting combined compressed air type environmentally friendly gas load switch cabinet, comprising a sealed air chamber, a cable chamber, and a mechanism control chamber, characterized in that: The sealed gas chamber includes an air box and a pressure relief device installed outside the air box, and a three-phase three-position combination switch installed in the air box. The air box is a fully sealed structure and is filled with environmentally friendly insulating gas; the cable room includes a cable bushing for cable connection; the mechanism control room includes an operating mechanism for electrical, mechanical control and interlocking; the air box also includes a busbar, a connecting conductor and a busbar bushing passing through the air box. The three-phase three-position combination switch is connected to the busbar through the busbar bushing to achieve the expansion of the busbar between cabinets. The three-phase three-position combination switch is connected to the cable bushing through the connecting conductor to achieve cable connection The three-phase three-position combination switch includes a cylinder-type movable contact seat and a piston-type movable contact, a static contact, a grounding static contact and a crank arm of a cylinder structure. One end of the movable contact seat is fixed, and the first end of the crank arm and the two sides of the contact end of the movable contact are connected in a connecting rod manner. The operating mechanism is connected to the second end of the crank arm through a transmission shaft, and drives the crank arm to rotate while driving the movable contact to move linearly in the movable contact seat, thereby controlling the closing and opening of the movable contact and the static contact, and controlling the opening and closing of the movable contact and the grounding static contact, thereby realizing the closing, opening and grounding operations of the three-phase three-position combination switch. The moving contact includes a contact tube, a honeycomb-shaped moving arc contact fixed at one end of the contact tube, a nozzle and a crank arm seat, and a piston fixed at the other end of the contact tube; the static contact includes a static main contact, a static contact spring, a pointed rod-shaped static arc contact, a buffer pad arranged on the front of the static arc contact, and a deionization grid arranged on the back of the static arc contact; the static arc contact and the static main contact are coaxially fixed on the wiring copper busbar, and the static arc contact is axially higher than the static main contact. The static main contact is a cup-shaped cylindrical structure, the cup bottom is fixed to the wiring copper busbar, and the cup mouth is a petal contact. Under the tightening stress of the static contact spring, it forms a sliding electrical contact with the moving contact; the contact tube The moving arc contact, the nozzle, the piston and the crank arm seat are coaxially fixed, and the crank arm seat is rotatably connected to the first end of the crank arm through two symmetrically arranged shaft protrusions. The moving arc contact is fixed in the contact tube and axially higher than the contact tube but lower than the nozzle; when the piston-type moving contact and the static contact are separated, the static main contact and the contact tube are separated first, and the static arc contact and the moving arc contact are separated later, and the arc is extinguished by the nozzle and the deionization grid; when the piston-type moving contact and the static contact are closed, the static arc contact is first inserted into the moving arc contact, and the contact tube is inserted into the static main contact later, and the impact is buffered by the nozzle and the buffer pad.

2. The rotary and direct-acting combined compressed air type environmentally friendly gas load switch cabinet according to claim 1, characterized in that: Any of the three-phase three-position combination switches also includes a metal base frame, two insulating support plates, an insulating seat, and a short-circuit copper bar; the cylinder-type moving contact seat and the piston-type moving contact of the air cylinder structure are fixed in the middle of the metal base frame by the two insulating support plates, and together with the axial hole of the metal base frame, the transmission shaft passes through the second end of the crank arm to drive the crank arm to rotate; the static contact is fixed to the upper side of the metal base frame through the insulating seat, the static arc contact is lower than the outer bell cover of the insulating seat, so that the static contact is placed in the outer bell cover of the insulating seat, and the deionization grid is installed in the insulating seat; the grounding static contact is directly fixed to the lower side of the metal base frame together with the short-circuit copper bar; the rotation of the crank arm causes the moving contact to contact and connect with the static contact when it is in the closed position, the rotation of the crank arm causes the moving contact to contact and connect with the grounding static contact when it is in the ground position, and the rotation of the crank arm causes the crank arm and the air cylinder structure to be in a straight line when it is in the open position.

3. The rotary and direct-acting combined compressed air type environmentally friendly gas load switch cabinet according to claim 2, characterized in that: The movable contact seat includes an air cylinder, a fixed seat, a bus bar, a drain bar, a movable contact tube, a contact spring, a cylinder, and a spring; the movable contact tube is a cylindrical structure, one end of which is fixed in the air cylinder, and the other end is made into a petal contact. Under the tightening stress of the contact spring, it forms a sliding electrical contact with the movable contact; The piston slides up and down in the gas cylinder and the moving contact tube to form a gas cylinder structure, and by compressing the gas in the gas cylinder, the arc is blown out through the nozzle when the switch is opened and the impact is buffered when the switch is closed; the gas cylinder is made of insulating material, and consists of a large cylinder and a small cylinder with two orthogonal axes, the small cylinder is coaxially fixed to the cylinder and rotates with the cylinder, one end of the large cylinder is connected to the moving contact tube, and the end face of the other end is closed; the moving contact tube uses the cylinders on both sides as the rotation axis, and the spring is installed between the concave hole of the cylinder and the bus, so that the moving contact tube and the bus on both sides form a rotating electrical contact through the cylinder and the spring, and at the same time, the moving contact tube and the contact tube form a linear sliding electrical contact, so that the moving contact rotates with the cylinders on both sides as the axis and performs linear motion guided by the moving contact tube to form a conductive circuit.

4. The rotary and direct-acting combined compressed air type environmentally friendly gas load switch cabinet according to claim 3, characterized in that: The fixing seat is provided with a closing limit for limiting the closing action of the moving contact and the static contact, and a grounding limit for limiting the grounding action of the moving contact and the grounding static contact.

5. The rotary and direct-acting combined compressed air type environmentally friendly gas load switch cabinet according to claim 4, characterized in that: The ends of the static arc contact and the moving arc contact are both made of arc-resistant materials; the deionization grid is composed of a number of parallel arranged bent steel plates and / or filter screens, the bent steel plates are provided with a number of turbulent flow punchings, which are insulated from each other and maintain an air gap spacing; the filter screen is a metal mesh with a high mesh density and is fixed on top of the deionization grid; the junction of the insulating seat, the wiring copper busbar, and the static main contact is provided with honeycomb-shaped ventilation holes for guiding high-temperature arc gas to the deionization grid for cooling and filtering.

6. The rotary and direct-acting combined compressed air type environmentally friendly gas load switch cabinet according to claim 5, characterized in that: The moving contact, the moving arc contact, the static contact, the static arc contact, the grounding static contact, and the moving contact tube all adopt cylindrical, cylindrical, and round head structures and combinations, and the electrical contact method between them is coaxial circular sliding electrical contact method; the insulating support plate, the fixing seat, and the insulating seat are cast with solid insulating material and formed into one body.

7. The rotary and direct-acting combined compressed air type environmentally friendly gas load switch cabinet according to claim 6, characterized in that: The grounding static contact comprises a grounding static main contact, a grounding static contact spring, a pointed rod-shaped grounding static arcing contact, and a grounding buffer pad arranged on the front of the static arcing contact; The grounding static arc contact and the grounding static main contact are coaxially fixed on the grounding short-circuit copper bar, and the grounding static arc contact is axially higher than the grounding static main contact. The grounding static main contact is a cup-shaped cylindrical structure, the cup bottom is fixed to the grounding short-circuit copper bar, and the cup mouth is a petal contact. Under the tightening stress of the grounding static contact spring, it forms a sliding electrical contact with the moving contact.

8. The rotary and direct-acting combined compressed air type environmentally friendly gas load switch cabinet according to claim 7, characterized in that: When the moving contact starts to move apart from the closed position under the drive of the crank arm, on the one hand, the moving contact and the moving contact tube rotate together with the cylinders on both sides as axes, and on the other hand, the moving contact and the moving contact tube move linearly relative to each other. At the same time, the static arc contact blocks the nozzle at the beginning of the opening stage, and the piston pre-compresses the gas in the gas cylinder until the nozzle and the static arc contact are separated. After the separation, the pre-compressed gas and the gas compressed by the piston as the moving contact continues to move apart blow out the arc through the nozzle, and as the moving contact and the static contact continue to separate rapidly, they finally reach and stay in the open position. When the moving contact starts to close from the open position under the drive of the crank arm, on the one hand, the moving contact quickly approaches the static contact during rotation and linear motion. When the static arcing contact is inserted into the nozzle, the nozzle is blocked, causing the piston to compress the gas in the gas cylinder, thereby cushioning the closing impact of the moving contact, so that the moving contact smoothly reaches and stays in the closed position under the combined restriction of the buffer pad and the closing limiter. When the moving contact starts to move apart from the ground position under the drive of the crank arm, on the one hand, the moving contact and the moving contact tube rotate together with the cylinders on both sides as axes, and on the other hand, the moving contact and the moving contact tube move linearly relative to each other. At the same time, the grounding static arc contact blocks the nozzle at the beginning of the opening phase, and the piston pre-compresses the gas in the gas cylinder until the nozzle and the grounding static arc contact are separated and after separation, and as the moving contact and the grounding static contact continue to separate rapidly, they finally reach and stay in the opening position; When the moving contact starts to move from the split position under the drive of the crank arm, on the one hand, the moving contact quickly approaches the grounding static contact during rotation and linear motion. When the grounding static arc contact is inserted into the nozzle, the nozzle will be blocked so that the piston compresses the gas in the gas cylinder to cushion the closing impact of the moving contact, so that the moving contact smoothly reaches and stays at the ground position under the joint restriction of the buffer pad and the grounding limit.

9. The rotary and direct-acting combined compressed air type environmentally friendly gas load switch cabinet according to claim 8, characterized in that: The grounding static contact is arranged on the upper side of the metal base frame, the grounding static contact is arranged on the lower side of the metal base frame, or only the static contact is arranged, or only the grounding static contact is arranged; the busbar bushing is an inner cone type, installed on the upper side of the sealed air chamber and realizes the connection and extension of the busbar between switch cabinets through a busbar connector; or the busbar bushing is an outer cone type, installed on the top outside of the sealed air chamber and realizes the connection and extension of the busbar between switch cabinets through an insulating busbar.

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