Switch unit of disconnecting switch

Abstract

The utility model relates to the field of low-voltage electric appliances, in particular to a switch unit of an isolating switch, which is characterized in that a left inner air passage / a right inner air passage is arranged between a left arc extinguishing system / a right arc extinguishing system and the side wall of a unit shell, and a left outlet / a right outlet is arranged on the left side wall / the right side wall of the unit shell and is used for communicating the left inner air passage / the right inner air passage with the external environment; the left flow guide structure / the right flow guide structure is arranged in the left inner air channel / the right inner air channel and is spaced from the left side wall / the right side wall, and a left channel with one end facing the left arc extinguishing system and the other end facing the left side wall is formed between adjacent left guide plates of the left flow guide structure. A right channel with one end facing the right arc extinguishing system and the other end facing the right side wall is formed between adjacent right guide plates of the right flow guide structure; a first left guide plate / first right guide plate is opposite to the left air outlet / right air outlet, and the two ends of the first left guide plate / first right guide plate exceed the two ends of the left outlet / right outlet in the width direction of the left outlet / right outlet; the switch unit is good in arc extinguishing performance.

Description

Technical Field

[0001] The utility model relates to the field of low-voltage electrical appliances, in particular to a switch unit of an isolating switch. Background Art

[0002] The existing rotary isolating switch is composed of an operating mechanism and a switch body. The switch body includes a plurality of switch units stacked in sequence. Each switch unit includes a movable contact mechanism and a static contact that are rotatably arranged. The movable contact mechanism is transmission-connected with the operating mechanism and is closed and disconnected with the static contact by the driving of the operating mechanism. Each switch unit is also provided with an arc extinguishing system. The arc gas generated by the arc extinguishing system when extinguishing the arc flows disorderly in the housing of the switch unit. The arc gas discharge efficiency is low, and the arc extinguishing performance of the arc extinguishing system of the switch unit is average, which further affects the arc extinguishing efficiency of the arc extinguishing system. In addition, the arc gas generated by the arc extinguishing system when extinguishing the arc is mostly discharged directly through the opening provided on the unit housing of the switch unit, which is easy to cause arc escape problems and poor safety. Utility Model Content

[0003] The utility model aims to overcome at least one defect of the prior art and provide a switch unit of an isolating switch with good arc extinguishing performance.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A switch unit of an isolating switch, comprising a unit housing, an arc extinguishing system and a contact system arranged in the unit housing; the contact system comprises a rotatably arranged moving contact mechanism and two groups of stationary contacts, the moving contact mechanism comprises two groups of moving contact portions, the two groups of moving contact portions respectively cooperate with the two groups of stationary contacts to form two groups of contact pairs, and the two groups of arc extinguishing systems are a left arc extinguishing system and a right arc extinguishing system respectively cooperate with the two groups of contact pairs;

[0006] The unit shell includes a left inner air duct arranged between the left arc extinguishing system and the side wall of the unit shell, a right inner air duct arranged between the right arc extinguishing system and the side wall of the unit shell, a left outlet arranged on the left side wall of the unit shell for connecting the left inner air duct with the external environment, and a right outlet arranged on the right side wall of the unit shell for connecting the right inner air duct with the external environment;

[0007] The unit housing further includes a left flow guiding structure disposed in the left inner air passage and spaced from the left side wall, and a right flow guiding structure disposed in the right inner air passage and spaced from the right side wall. The left flow guiding structure includes a plurality of left guide plates, and a left passage is formed between adjacent left guide plates, with one end facing the left arc extinguishing system and the other end facing the left side wall. The left guide plate opposite to the left air outlet is the first left guide plate, and both ends of the first left guide plate extend beyond both ends of the left air outlet in the width direction of the left air outlet. The right flow guiding structure includes a plurality of right guide plates, and a right passage is formed between adjacent right guide plates, with one end facing the right arc extinguishing system and the other end facing the right side wall. The right guide plate opposite to the right outlet is the first right guide plate, and both ends of the first right guide plate extend beyond both ends of the right outlet in the width direction of the right outlet.

[0008] Further, the left flow guiding structure is also in limiting cooperation with the left arc extinguishing system for limiting the left arc extinguishing system in a preset position; the right flow guiding structure is also in limiting cooperation with the right arc extinguishing system for limiting the right arc extinguishing system in a preset position.

[0009] Further, the first left guide plate includes a first left protrusion disposed on the side facing the left outlet, and the first left protrusion is a wedge-shaped protrusion protruding towards the left outlet; the first right guide plate includes a first right protrusion disposed on the side facing the right outlet, and the first right protrusion is a wedge-shaped protrusion protruding towards the right outlet.

[0010] Further, the middle of the side of the first left guide plate facing the left arc extinguishing system abuts against the left arc extinguishing system, and both ends are spaced from the air outlet of the left arc extinguishing system; the middle of the side of the first right guide plate facing the right arc extinguishing system abuts against the right arc extinguishing system, and both ends are spaced from the air outlet of the right arc extinguishing system.

[0011] Further, both the left arc extinguishing system and the right arc extinguishing system are C-shaped structures surrounding the moving contact mechanism; one end of each arc extinguishing system extends to the corresponding static contact, and the other end extends to the disconnection position of the corresponding moving contact part.

[0012] Further, in the rotation direction of the moving contact mechanism, both ends of the left inner air passage extend to both ends of the left arc extinguishing system, the left outlet is disposed on one side of the middle of the left inner air passage, both ends of the right inner air passage extend to both ends of the right arc extinguishing system, and the right outlet is disposed on one side of the middle of the right inner air passage.

[0013] Further, each arc extinguishing system includes at least two arc extinguishing chambers surrounding the moving contact mechanism; the arc inlet of at least one arc extinguishing chamber of the left arc extinguishing system is directly communicated with the left inner air passage through the left passage; the arc inlet of at least one arc extinguishing chamber of the right arc extinguishing system is directly communicated with the right inner air passage through the right passage.

[0014] Further, in each of the arc extinguishing systems, any two adjacent arc extinguishing chambers form a set of arc extinguishing chamber groups; in the left arc extinguishing system, a gap communicating with the arc inlets of the two arc extinguishing chambers is formed between the adjacent ends of at least one set of arc extinguishing chamber groups, and the gap is communicated with the left inner air duct through the corresponding left channel; in the right arc extinguishing system, a gap communicating with the arc inlets of the two arc extinguishing chambers is formed between the adjacent ends of at least one set of arc extinguishing chamber groups, and the gap is communicated with the right inner air duct through the corresponding right channel.

[0015] Further, each of the arc extinguishing systems includes three arc extinguishing chambers arranged around the moving contact mechanism; the three arc extinguishing chambers of the left arc extinguishing system are the first left arc extinguishing chamber, the second left arc extinguishing chamber, and the third left arc extinguishing chamber arranged in sequence. The first left arc extinguishing chamber is arranged close to the corresponding static contact, and the third left arc extinguishing chamber is arranged close to the disconnection position of the corresponding moving contact part. The arc inlets of the three arc extinguishing chambers are directly communicated with the left inner air duct through the corresponding left channels respectively; the right arc extinguishing system includes three arc extinguishing chambers, which are the first right arc extinguishing chamber, the second right arc extinguishing chamber, and the third right arc extinguishing chamber arranged in sequence. The first right arc extinguishing chamber is arranged close to the corresponding static contact, and the third right arc extinguishing chamber is arranged close to the disconnection position of the corresponding moving contact part. The arc inlets of the three arc extinguishing chambers are communicated with the right inner air duct through the corresponding right channels respectively.

[0016] Further, the left flow guiding structure further includes a second left guide plate, a third left guide plate, a fourth left guide plate, a fifth left guide plate, a sixth left guide plate, and a seventh left guide plate. The air outlet of the first left arc extinguishing chamber faces the rear side wall of the unit housing. The second left guide plate is arranged on the rear side wall of the unit housing. The third left guide plate is arranged on one side of the end of the first left arc extinguishing chamber close to the second left arc extinguishing chamber. One end of the left channel between the second left guide plate and the third left guide plate is communicated with the air outlet of the first left arc extinguishing chamber and the other end faces the left side wall. The fourth left guide plate is arranged on one side of the end of the second left arc extinguishing chamber close to the first left arc extinguishing chamber. One end of the left channel between the third left guide plate and the fourth left guide plate is communicated with the arc inlets of the first left arc extinguishing chamber and the second left arc extinguishing chamber and the other end faces the left side wall. The first left guide plate is arranged on one side of the air outlet of the second left arc extinguishing chamber and is located between the left side wall and the air outlet of the second left arc extinguishing chamber. One end of the left channel between the fourth left guide plate and the first left guide plate is communicated with the air outlet of the second left arc extinguishing chamber and the other end faces the left side wall. The fifth left guide plate is arranged on one side of the end of the second left arc extinguishing chamber close to the third left arc extinguishing chamber. One end of the left channel between the first left guide plate and the fourth left guide plate is communicated with the air outlet of the second left arc extinguishing chamber and the other end faces the left side wall. The sixth left guide plate is arranged on one side of the end of the third left arc extinguishing chamber close to the second left arc extinguishing chamber. One end of the left channel between the fifth left guide plate and the sixth left guide plate is communicated with the arc inlets of the second left arc extinguishing chamber and the third left arc extinguishing chamber and the other end faces the left side wall. The air outlet of the third left arc extinguishing chamber faces the connection between the left side wall and the front side wall of the unit housing. The seventh left guide plate is arranged within the included angle between the left side wall and the front side wall. One end of the left channel between the seventh left guide plate and the sixth left guide plate is communicated with the air outlet of the third arc extinguishing chamber and the other end faces the left side wall. One end of the seventh left guide plate extends to the middle of the air outlet of the third left arc extinguishing chamber;

[0017] The right flow guiding structure further includes a second right guide plate, a third right guide plate, a fourth right guide plate, a fifth right guide plate, a sixth right guide plate and a seventh right guide plate. The air outlet of the first right arc extinguishing chamber faces the rear side wall of the unit housing. The second right guide plate is arranged on the rear side wall of the unit housing. The third right guide plate is arranged on one side of the first right arc extinguishing chamber near one end close to the second right arc extinguishing chamber. One end of the right channel between the second right guide plate and the third right guide plate is communicated with the air outlet of the first right arc extinguishing chamber and the other end faces the right side wall. The fourth right guide plate is arranged on one side of the second right arc extinguishing chamber near one end close to the first right arc extinguishing chamber. One end of the right channel between the third right guide plate and the fourth right guide plate is communicated with the arc inlets of the first right arc extinguishing chamber and the second right arc extinguishing chamber and the other end faces the right side wall. The first right guide plate is arranged on one side of the air outlet of the second right arc extinguishing chamber and is located between the right side wall and the air outlet of the second right arc extinguishing chamber. One end of the right channel between the fourth right guide plate and the first right guide plate is communicated with the air outlet of the second right arc extinguishing chamber and the other end faces the right side wall. The fifth right guide plate is arranged on one side of the second right arc extinguishing chamber near one end close to the third right arc extinguishing chamber. One end of the right channel between the first right guide plate and the fourth right guide plate is communicated with the air outlet of the second right arc extinguishing chamber and the other end faces the right side wall. The sixth right guide plate is arranged on one side of the third right arc extinguishing chamber near one end close to the second right arc extinguishing chamber. One end of the right channel between the fifth right guide plate and the sixth right guide plate is communicated with the arc inlets of the second right arc extinguishing chamber and the third right arc extinguishing chamber and the other end faces the right side wall. The air outlet of the third right arc extinguishing chamber faces the connection part of the right side wall and the front side wall of the unit housing. The seventh right guide plate is arranged within the included angle between the right side wall and the front side wall. One end of the right channel between the seventh right guide plate and the sixth right guide plate is communicated with the air outlet of the third right arc extinguishing chamber and the other end faces the right side wall. One end of the seventh right guide plate extends to the middle of the air outlet of the third right arc extinguishing chamber.

[0018] Further, the third left guide plate and the fourth left guide plate are respectively in limit fit with one end of the first left arc extinguishing chamber close to the second left arc extinguishing chamber. The fourth left guide plate is in limit fit with one end of the second left arc extinguishing chamber close to the first left arc extinguishing chamber. The first left guide plate is in limit fit with the side of the second left arc extinguishing chamber facing the left side wall. The fifth left guide plate is in limit fit with one end of the second left arc extinguishing chamber close to the third left arc extinguishing chamber. The sixth left guide plate is in limit fit with one end of the third left arc extinguishing chamber close to the second left arc extinguishing chamber.

[0019] The third right guide plate and the fourth right guide plate are respectively in limit fit with one end of the first right arc extinguishing chamber close to the second right arc extinguishing chamber. The fourth right guide plate is in limit fit with one end of the second right arc extinguishing chamber close to the first right arc extinguishing chamber. The first right guide plate is in limit fit with the side of the second right arc extinguishing chamber facing the right side wall. The fifth right guide plate is in limit fit with one end of the second right arc extinguishing chamber close to the third right arc extinguishing chamber. The sixth right guide plate is in limit fit with one end of the third right arc extinguishing chamber close to the second right arc extinguishing chamber.

[0020] Further, the unit housing further includes a left outer pipe disposed on the outer side of the left side wall. The left outer pipe extends along the rotation axis of the moving contact mechanism. The left outlet communicates with one side of the left outer pipe, and at least one end of the two ends of the left outer pipe communicates with the external environment. The unit housing further includes a right outer pipe disposed on the outer side of the right side wall. The right outer pipe extends along the rotation axis of the moving contact mechanism. The right outlet communicates with one side of the right outer pipe, and at least one end of the two ends of the right outer pipe communicates with the external environment.

[0021] For the switch unit of the disconnecting switch of the present utility model, its left arc extinguishing system and right arc extinguishing system respectively enter the wide left inner air duct and right inner air duct through the narrow left channel and right channel, so that the arc gas compresses and expands during the flow process, which is beneficial to further extinguish the arcs that have not been successfully extinguished by the left arc extinguishing system and the right arc extinguishing system, and improves the arc extinguishing performance of the switch unit. Moreover, the left flow guiding structure and the right flow guiding structure realize the combing of the arc gas, so that the arc gas can flow more smoothly and be discharged from the switch unit.

[0022] In addition, the left outer pipe and the right outer pipe increase the outflow path of the arc gas generated when the switch unit extinguishes the arc, eliminate or significantly reduce the possibility of the arc escaping from the switch unit, and the left outer pipe and the right outer pipe change the air flow direction of the arc gas entering the external environment, avoiding damage to the electrical equipment arranged side by side of the disconnecting switch caused by the arc gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is the projection view of the switch unit of layer A of the present utility model;

[0024] Figure 2 is the three-dimensional structure diagram of the switch unit of layer A of the present utility model, including the cross-sectional view of the left outer pipe of layer A and the left connection hole;

[0025] Figure 3 is the projection view of the housing A of the present utility model;

[0026] Figure 4 is the three-dimensional structure diagram of the housing A of the present utility model, including the cross-sectional view of the left outer pipe of layer A and the left connection hole;

[0027] Figure 5 is the projection view of the switch unit of layer B of the present utility model;

[0028] Figure 6 is the three-dimensional structure diagram of the switch unit of layer B of the present utility model;

[0029] Figure 7 is the projection view of the housing B of the present utility model;

[0030] Figure 8It is a three-dimensional structural schematic diagram of the B shell of the present utility model;

[0031] Figure 9 It is a structural schematic diagram of the switch body of the present utility model;

[0032] Figure 10 It is a structural schematic diagram of the first embodiment of the arc extinguishing chamber of the present utility model;

[0033] Figure 11 It is a structural schematic diagram of the second embodiment of the arc extinguishing chamber of the present utility model;

[0034] Figure 12 It is a structural schematic diagram of the third embodiment of the arc extinguishing chamber of the present utility model.

[0035] Explanation of reference numerals

[0036] Housing h;

[0037] A-layer switch unit 1u;

[0038] A shell 1, A-layer left arc extinguishing area 1-0a, A-layer left side wall 1-0s, A-layer left connection hole 1-10c, A-layer left inner air duct 1-10i, A-layer left outlet 1-10g, A-layer left outer pipe 1-10o, A-layer right arc extinguishing area 1-1a, A-layer right side wall 1-1s, A-layer right connection hole 1-11c, A-layer right inner air duct 1-11i, A-layer right outlet 1-11g, A-layer right outer pipe 1-11o, A-layer left arc extinguishing system 1-20, A-layer left arc extinguishing chamber 1-200, A-layer right arc extinguishing system 1-21, A-layer right arc extinguishing chamber 1-210, A-layer moving contact mechanism 1-3, A-layer first static contact 1-40, A-layer second static contact 1-41, A-layer left diversion structure 1-50, A-layer first left guide plate 1-500, A-layer second left guide plate 1-501, A-layer third left guide plate 1-502, A-layer fourth left guide plate 1-503, A-layer fifth left guide plate 1-504, A-layer sixth left guide plate 1-505, A-layer seventh left guide plate 1-506, A-layer eighth left guide plate 1-507, A-layer right diversion structure 1-51, A-layer first right guide plate 1-510, A-layer second right guide plate 1-511, A-layer third right guide plate 1-512, A-layer fourth right guide plate 1-513, A-layer fifth right guide plate 1-514, A-layer sixth right guide plate 1-515, A-layer seventh right guide plate 1-516, A-layer phase partition plate 1-6, A-layer first partition part 1-70, A-layer second partition part 1-71, A-layer first static contact position 1-80, A-layer second static contact position 1-81, A-layer shaft hole 1-9;

[0039] B-layer switch unit 2u;

[0040] B housing 2, left arc extinguishing area 2-0a of B layer, left side wall 2-0s of B layer, left connection hole 2-10c of B layer, left inner air duct 2-10i of B layer, left outlet 2-10g of B layer, left outer pipeline 2-10o of B layer, right arc extinguishing area 2-1a of B layer, right side wall 2-1s of B layer, right connection hole 2-11c of B layer, right inner air duct 2-11i of B layer, right outlet 2-11g of B layer, right outer pipeline 2-11o of B layer, left arc extinguishing system 2-20 of B layer, left arc extinguishing chamber 2-200 of B layer, right arc extinguishing system 2-21 of B layer, right arc extinguishing chamber 2-210 of B layer, moving contact mechanism 2-3 of B layer, first static contact 2-40 of B layer, second static contact 2-41 of B layer, left flow guiding structure 2-50 of B layer, first left guide plate 2-500 of B layer, second left guide plate 2-501 of B layer, third left guide plate 2-502 of B layer, fourth left guide plate 2-503 of B layer, fifth left guide plate 2-504 of B layer, sixth left guide plate 2-505 of B layer, seventh left guide plate 2-506 of B layer, eighth left guide plate 2-507 of B layer, right flow guiding structure 2-51 of B layer, first right guide plate 2-510 of B layer, second right guide plate 2-511 of B layer, third right guide plate 2-512 of B layer, fourth right guide plate 2-513 of B layer, fifth right guide plate 2-514 of B layer, sixth right guide plate 2-515 of B layer, sixth right guide plate 2-516 of B layer, eighth right guide plate 2-517 of B layer, phase partition plate 2-6 of B layer, first partition part 2-70 of B layer, second partition part 2-71 of B layer, first static contact position 2-80 of B layer, second static contact position 2-81 of B layer, shaft hole 2-9 of B layer;

[0041] First left main pipeline 1l, second left main pipeline 2l, first right main pipeline 1r, second right main pipeline 2r.

[0042] Arc extinguishing side plate 3-0, arc extinguishing grid 3-1, arc extinguishing back plate 3-2. Specific embodiments

[0043] The following embodiments given in conjunction with the drawings further illustrate the specific embodiments of the disconnecting switch of the present invention. The disconnecting switch of the present invention is not limited to the description of the following embodiments.

[0044] Such as Figure 9As shown, the isolating switch of the utility model comprises an operating mechanism and a switch body, the switch body comprises at least one switch unit, each switch unit comprises a unit shell and a contact system arranged in the switch shell, the contact system comprises a moving contact mechanism and two groups of static contacts used in conjunction with each other, the moving contact mechanism comprises two groups of moving contact parts, the two groups of static contacts are respectively a first static contact and a second static contact, the two groups of moving contact parts respectively cooperate with the two groups of static contacts to form two groups of contact pairs, the operating mechanism is transmission-connected to the moving contact mechanism of the switch unit, and drives the switch unit to close and open; each of the switch units also comprises an arc extinguishing system, the two groups of arc extinguishing systems are arranged at relative intervals and respectively cooperate with the two groups of contact pairs to extinguish the contact For the arc generated by the contact, the two groups of arc extinguishing systems are respectively a left arc extinguishing system and a right arc extinguishing system; each of the unit shells also includes a left arc extinguishing area and a right arc extinguishing area arranged therein and a left outlet and a right outlet arranged on the side wall of the unit shell, the left arc extinguishing area is connected to the external environment (the external environment where the isolating switch is located, and also the external environment where the switch unit is located) through the left outlet (which also means that the left arc extinguishing system is connected to the external environment through the left outlet), and the right arc extinguishing area is connected to the external environment through the right outlet (which also means that the right arc extinguishing system is connected to the external environment through the right outlet), and the left arc extinguishing system and the right arc extinguishing system of each switch unit are arranged in the corresponding left arc extinguishing area and the right arc extinguishing area. Further, the operating mechanism is stacked together with the switch body along the first direction. Further, the unit shell includes a left side wall and a right side wall arranged opposite to each other and a front side wall and a rear side wall arranged opposite to each other.

[0045] Specifically, the isolating switch of the utility model is a rotary isolating switch. In the switch unit, the moving contact mechanism is rotatably arranged in the unit shell and the axial direction of the rotating shaft of the moving contact mechanism is the same as the first direction. The moving contact mechanism is closed and disconnected with the static contact by rotation. In the switch unit, the left outlet and the right outlet are respectively arranged on the left side wall and the right side wall of the unit shell. Furthermore, the number of the left outlet is not limited to one, and the number of the right outlet is not limited to one. According to actual needs, the number of the left outlet can be greater than or equal to 2, and the number of the right outlet can be greater than or equal to 2. Furthermore, if Figure 1 and 5 direction shown, Figure 1 and 5 The left and right direction is the left and right direction of the unit shell, Figure 1 and 5 The up-down direction is the front-back direction of the unit shell. Figure 1 and 5 The left and right side walls of the unit housing shown are the left side wall and the right side wall respectively. Figure 1 and 5 The upper and lower side walls of the illustrated unit housing are the rear side wall and the front side wall, respectively.

[0046] The isolating switch of the utility model further comprises a housing h, which comprises a unit shell of a switch unit. Further, the housing h also comprises a housing of an operating mechanism.

[0047] Furthermore, the switch body includes at least two switch units, each switch unit is stacked together in sequence along a first direction, and the operating mechanism is transmission-connected to the moving contact mechanism of each switch unit to drive each switch unit to close and open synchronously.

[0048] Specifically, the switch body includes an A-layer switch unit 1u and a B-layer switch unit 2u, and the A-layer switch unit 1u and the B-layer switch unit 2u are stacked together alternately along a first direction, that is, A represents the A-layer switch unit 1u, and B represents the B-layer switch unit 2u. The switch units of the switch body are stacked together along the first direction in the form of ABAB..., and AB refers to adjacent layer switch units, that is, each A-layer switch unit 1u is adjacent to at least one B-layer switch unit 2u and each B-layer switch unit is adjacent to at least one A-layer switch unit. It should be pointed out that when the switch body includes only two switch units, that is, the two switch units are the A-layer switch unit 1u and the B-layer switch unit 2u, respectively, then the two switch units are stacked together along the first direction, which is also a special form in which the A-layer switch unit 1u and the B-layer switch unit 2u are stacked together alternately in sequence. Figure 1-2 As shown, the unit shell, contact system, moving contact mechanism, first static contact, second static contact, arc extinguishing system, left arc extinguishing system, right arc extinguishing system, left arc extinguishing area, right arc extinguishing area, left outlet, right outlet, left side wall, and right side wall of the A-layer switch unit 1u are respectively A-shell 1, A-layer contact system, A-layer moving contact mechanism 1-3, A-layer first static contact 1-40, A-layer second static contact 1-41, A-layer arc extinguishing system, A-layer left arc extinguishing system 1-20, A-layer right arc extinguishing system 1-21, A-layer left arc extinguishing area 1-0a, A-layer right arc extinguishing area 1-1a, A-layer left outlet 1-10g, A-layer right outlet 1-11g, A-layer left side wall 1-0s, A-layer right side wall 1-1s. Figure 5-6 As shown, the unit shell, contact system, moving contact mechanism, first static contact, second static contact, arc extinguishing system, left arc extinguishing system, right arc extinguishing system, left arc extinguishing area, right arc extinguishing area, left outlet, right outlet, left side wall, and right side wall of the B layer switch unit 2u are respectively B shell 2, B layer contact system, B layer moving contact mechanism 2-3, B layer first static contact 2-40, B layer second static contact 2-41, B layer arc extinguishing system, B layer left arc extinguishing system 2-20, B layer right arc extinguishing system 2-21, B layer left arc extinguishing area 2-0a, B layer right arc extinguishing area 2-1a, B layer left outlet 2-10g, B layer right outlet 2-11g, B layer left side wall 2-0s, and B layer right side wall 2-1s.

[0049] Further, in each of the switch units, a first static contact position for carrying a first static contact is provided between one ends of the left arc extinguishing region and the right arc extinguishing region, a second static contact position for carrying a second static contact is provided between the other ends of the left arc extinguishing region and the right arc extinguishing region, the left outlet is arranged at the midpoint position between the two ends of the left arc extinguishing region, that is, at the midpoint position between the two ends of the left arc extinguishing system, and the right outlet is arranged at the midpoint position between the two ends of the right arc extinguishing region, that is, at the midpoint position between the two ends of the right arc extinguishing system; the above structural design can enable the arc gas generated at one end of the arc extinguishing system close to the corresponding static contact to stay in the unit housing for a short time, and exist in the arc extinguishing system as much as possible at the same time as the arc gas generated by extinguishing the arc at the other end of the arc extinguishing system, so as to improve the efficiency of the arc extinguishing grid of the arc extinguishing system in cutting the arc. Further, the left side wall and the right side wall of the unit housing are arranged opposite to each other, the front side wall and the rear side wall of the unit housing are arranged opposite to each other, the front and rear ends of the left side wall are respectively connected to the front side wall and the rear side wall, the front and rear ends of the right side wall are respectively connected to the front side wall and the rear side wall, the left outlet is arranged on the left side wall of the unit housing and close to the midpoint position between the front and rear ends of the left side wall, the right outlet is arranged on the right side wall of the unit housing and close to the midpoint position between the front and rear ends of the right side wall, the two ends of the left arc extinguishing region respectively extend to the front side wall and the rear side wall, that is, the two ends of the left arc extinguishing system respectively extend to the front side wall and the rear side wall, the two ends of the right arc extinguishing region are respectively arranged at the front side wall and the rear side wall, and the right arc extinguishing system respectively extends to the front side wall and the rear side wall. In this embodiment, the left outlet and the right outlet of the same unit housing are preferably centrosymmetric structures with the rotation axis of the moving contact mechanism as the central symmetry axis, so that the arc movement and gas discharge in the left arc extinguishing region and the right arc extinguishing region are nearly the same.

[0050] Specifically, as Figure 1-4 shown, the first static contact position and the second static contact position of the switch unit 1u of layer A are the first static contact position 1-80 of layer A and the second static contact position 1-81 of layer A respectively; the first static contact position and the second static contact position of the switch unit 2u of layer B are the first static contact position 2-80 of layer B and the second static contact position 2-81 of layer B respectively; a first static contact position 1-80 of layer A is provided between one ends of the left arc extinguishing region 1-0a and the right arc extinguishing region 1-1a of layer A, and a second static contact position 1-81 of layer A is provided between the other ends, the left outlet 1-10g of layer A is arranged at the midpoint position between the two ends of the left arc extinguishing region 1-0a of layer A, that is, at the midpoint position between the two ends of the left arc extinguishing system 1-20 of layer A, and the right outlet 1-11g of layer A is arranged at the midpoint position between the two ends of the right arc extinguishing region 1-1a of layer A, that is, at the midpoint position between the two ends of the right arc extinguishing system 1-21 of layer A. As Figure 5-8As shown, the first static contact position and the second static contact position of the B-layer switch unit 1u are respectively the B-layer first static contact position 2-80 and the B-layer second static contact position 2-81; the first static contact position and the second static contact position of the B-layer switch unit 2u are respectively the B-layer first static contact position 2-80 and the B-layer second static contact position 2-81; a B-layer first static contact position 2-80 is provided between one ends of the B-layer left arc extinguishing region 2-0a and the B-layer right arc extinguishing region 2-1a, and a B-layer second static contact position 2-81 is provided between the other ends. The B-layer left outlet 2-10g is arranged at the midpoint position between the two ends of the B-layer left arc extinguishing region 2-0a close to it, that is, at the midpoint position between the two ends of the B-layer left arc extinguishing system 2-20. The B-layer right outlet 2-11g is arranged at the midpoint position between the two ends of the B-layer right arc extinguishing region 2-1a close to it, that is, at the midpoint position between the two ends of the B-layer right arc extinguishing system 2-21. Further, the front side wall and the rear side wall of the A shell 1 are arranged oppositely, the left side wall and the right side wall of the A shell 1 are arranged oppositely. The front and rear ends of the front side wall of the A shell 1 are respectively connected to the front side wall and the rear side wall of the A shell 1. The A-layer left outlet 1-10g is arranged on the left side wall of the A shell 1 and at the midpoint position between the front and rear ends of the left side wall of the A shell 1 close to it. The A-layer right outlet 1-11g is arranged on the right side wall and at the midpoint position between the front and rear ends of the right side wall close to it; the front side wall and the rear side wall of the B shell 2 are arranged oppositely, the left side wall and the right side wall of the B shell 2 are arranged oppositely. The front and rear ends of the front side wall of the B shell 2 are respectively connected to the front side wall and the rear side wall of the B shell 2. The B-layer left outlet 2-10g is arranged on the left side wall of the B shell 2 and at the midpoint position between the front and rear ends of the left side wall of the B shell 2 close to it. The B-layer right outlet 2-11g is arranged on the right side wall and at the midpoint position between the front and rear ends of the right side wall close to it.

[0051] As Figure 1-9 shown, the unit shell is further provided with a left outer pipeline and a right outer pipeline arranged on its side wall. The left outer pipeline and the right outer pipeline extend along the first direction. The left outlet is communicated with one side of the left outer pipeline, and at least one end of the left outer pipeline is communicated with the external environment, that is, an air flow path of left arc extinguishing region → left outlet → left outer pipeline → external environment ( Figure 1 and 5 the path shown by the dotted line in Figure 1 and 5The path shown by the dashed line in the middle). The left outer pipe and the right outer pipe increase the outflow path of the arc gas generated when the switching unit extinguishes the arc, eliminating or significantly reducing the possibility of the arc escaping from the switching unit. Moreover, the left outer pipe and the right outer pipe change the air flow direction of the arc gas entering the external environment, avoiding damage to the electrical equipment arranged side by side of the disconnecting switch. Further, the left outer pipe and the right outer pipe are respectively arranged on the left side wall and the right side wall of the unit housing. It should be noted that the number of the left outer pipes is not limited to one. The left outer pipe and the left outlet can be connected in a one-to-one manner, or one left outer pipe can be connected to two or more left outlets. The number of the right outer pipes is not limited to one. The right outer pipe and the right outlet can be connected in a one-to-one manner, or one right outer pipe can be connected to two or more right outlets.

[0052] Specifically, as Figure 1-2 shown, the left outer pipe and the right outer pipe of the A-layer switching unit 1u are respectively the A-layer left outer pipe 1-10o and the A-layer right outer pipe 1-11o; as Figure 5-6 shown, the left outer pipe and the right outer pipe of the B-layer switching unit 2u are respectively the B-layer left outer pipe 2-10o and the B-layer right outer pipe 2-11o.

[0053] Further, as Figure 9 shown, among two adjacent switching units, the left outer pipe and the right outer pipe on the same unit housing are arranged at intervals, and the left outer pipe and the right outer pipe of different unit housings are arranged in a staggered manner. Further, among two adjacent switching units, the two groups of left outer pipes are arranged on the same side of the housing h and in a staggered manner, and the two groups of right outer pipes are arranged on the same side of the housing h and in a staggered manner. That is, in the projection of the switch body perpendicular to the first direction, among two adjacent switching units, the two left outer pipes and the two right outer pipes are respectively arranged at the four vertices of a quadrilateral. The above structural design is beneficial to increasing the insulation distance and creepage distance between adjacent switching units and improving the overall insulation performance of the disconnecting switch of the present utility model.

[0054] Specifically, the A-layer left outer pipe 1-10o and the A-layer right outer pipe 1-11o are arranged at intervals, and the B-layer left outer pipe 2-10o and the B-layer right outer pipe 2-11o are arranged at intervals; the A-layer left outer pipe 1-10o and the A-layer right outer pipe 1-11o, and the B-layer left outer pipe 1-10o and the B-layer right outer pipe 1-11o are arranged in a staggered manner; that is, in the projection of the switch body perpendicular to the first direction, among two adjacent switching units, the A-layer left outer pipe 1-10o, the A-layer right outer pipe 1-11o, the B-layer left outer pipe 1-10o, and the B-layer right outer pipe 1-11o are distributed at the four vertices of a quadrilateral, and this quadrilateral is preferably a rectangle. Further, as Figure 9As shown, the left outer pipe 1-10o of layer A and the left outer pipe 2-20o of layer B are arranged on the same side of the housing h and are offset; the right outer pipe 1-11o of layer A and the right outer pipe 2-11o of layer B are arranged on the same side of the housing h and are offset; that is, in the projection of the disconnector of the present invention perpendicular to the first direction, the left outer pipe 1-10o of layer A and the left outer pipe 2-11o of layer B are arranged on the same side of the disconnector and are arranged side by side, and the right outer pipe 1-11o of layer A and the right outer pipe 2-11o of layer B are arranged on the same side of the disconnector and are arranged side by side. The relative positional relationship between the left outer pipe 1-10o of layer A and the left outer pipe 2-20o of layer B and the relative positional relationship between the right outer pipe 1-11o of layer A and the right outer pipe 2-11o of layer B are beneficial to increasing the insulation distance and creepage distance between the switch unit 1u of layer A and the switch unit 2u of layer B, and improving the overall insulation performance of the disconnector of the present invention. Further, among two adjacent switch units 1u of layer A, the left outer pipes 1-10o of each layer A are arranged opposite to each other along the first direction, and the right outer pipes 1-11o of each layer A are arranged opposite to each other along the first direction; among two adjacent switch units 2u of layer B, the left outer pipes 2-10o of each layer B are arranged opposite to each other along the first direction, and the right outer pipes 2-11o are arranged opposite to each other.

[0055] Further, as Figure 9 shown, the unit housing further includes a left connection hole and a right connection hole provided on the side wall of the unit housing; among two adjacent switch units, the left connection hole of one unit housing and the left outer pipe of the other unit housing are spliced together and communicated along the first direction, and the right connection hole of one unit housing and the right outer pipe of the other unit housing are spliced together and communicated along the first direction; in the switch body, the corresponding left outer pipe and the left connection hole are spliced together and penetrated in turn along the first direction to form a left main pipe, and the corresponding right outer pipe and the right connection hole are spliced together and penetrated in turn along the first direction to form a right main pipe. Further, in the unit, the side walls of the left connection hole and the left outer pipe are of an integral structure, and a common left partition wall is provided between the left connection hole and the left outer pipe. The side walls of the right connection hole and the right outer pipe are of an integral structure, and a common right partition wall is provided between the right connection hole and the right outer pipe. Further, the side walls of the left connection hole and the left outer pipe and the unit housing are of an integral structure, and the side walls of the right connection hole and the right outer pipe and the unit housing are of an integral structure.

[0056] As other embodiments of the left connection hole, the left outer pipe, the right connection hole, and the right outer pipe, the side walls of the left connection hole and the left outer pipe are of an integral structure and are detachably connected to the unit housing, and the side walls of the right connection hole and the right outer pipe are of an integral structure and are detachably connected to the unit housing. Further, the left connection hole and the left outer pipe may be arranged in parallel at intervals, that is, there is no common part between their side walls; the right connection hole and the right outer pipe may also be arranged in parallel at intervals, that is, there is no common part between their side walls.

[0057] Specifically, as Figure 1-2 shown in FIGS. 5-6 and 9, in the A-layer switch unit 1u, the left connection hole and the right connection hole of the A housing 1 are respectively the A-layer left connection hole 1-10c and the A-layer right connection hole 1-11c; in the B-layer switch unit 2u, the left connection hole and the right connection hole of the B housing 2 are respectively the B-layer left connection hole 2-10c and the B-layer right connection hole 2-11c; in the switch body, the A-layer left outer pipe 1-10o and the B-layer left connection hole 2-10c are alternately spliced together in sequence along the first direction and are penetrated to form a first left main pipe 1l, the A-layer left connection hole 1-10c and the B-layer left outer pipe 2-10o are alternately spliced together in sequence along the first direction and are penetrated to form a second left main pipe 2l, the A-layer right outer pipe 1-11o and the B-layer right connection hole 2-10c are alternately spliced together in sequence along the first direction and are penetrated to form a first right main pipe 1r, and the A-layer right connection hole 1-10c and the B-layer right outer pipe 2-11o are alternately spliced together in sequence along the first direction and are penetrated to form a second right main pipe 2r. Further, the side walls of the A-layer left outer pipe 1-10o and the A-layer left connection hole 1-10c are of an integral structure, and a common A-layer left partition wall is provided therebetween; the side walls of the A-layer right outer pipe 1-11o and the A-layer right connection hole 1-11c are of an integral structure, and a common A-layer right partition wall is provided therebetween; the side walls of the B-layer left outer pipe 2-10o and the B-layer left connection hole 2-10c are of an integral structure, and a common B-layer left partition wall is provided therebetween; the side walls of the B-layer right outer pipe 2-11o and the B-layer right connection hole 2-11c are of an integral structure, and a common B-layer right partition wall is provided therebetween. Further, the side walls of the A-layer left outer pipe 1-10o and the A-layer left connection hole 1-10c are of an integral structure with the A housing 1; the side walls of the A-layer right outer pipe 1-11o and the A-layer right connection hole 1-11c are of an integral structure with the A housing 1; the side walls of the B-layer left outer pipe 2-10o and the B-layer left connection hole 2-10c are of an integral structure with the B housing 2; the side walls of the B-layer right outer pipe 2-11o and the B-layer right connection hole 2-11c are of an integral structure with the B housing 2.

[0058] Further, the housing h further includes an air duct baffle, and an air duct baffle is provided on at least one end outside the left main duct and / or the right main duct at a relatively spaced position therefrom; that is, among the two ends of the left main duct, an air duct baffle is provided on at least one end outside at a relatively spaced position therefrom, and / or among the two ends of the right main duct, an air duct baffle is provided on at least one end outside at a relatively spaced position therefrom. The air duct baffle can change the direction of the air flow flowing out of the left main duct and the right main duct, and the air duct baffle is provided at the end of the left main duct and the right main duct according to actual needs.

[0059] Specifically, an air duct baffle is provided on at least one end outside the first left main duct 1l and / or the second left main duct 2l and / or the first right main duct 1r and / or the second right main duct 2r at a relatively spaced position therefrom. In this embodiment, air duct baffles are provided at one ends of the first left main duct 1l, the second left main duct 2l, the first right main duct 1r, and the second right main duct 2r close to the operating mechanism of the disconnecting switch to prevent the arc gas from harming the operator; alternatively, air duct baffles are provided at both ends of the first left main duct 1l, the second left main duct 2l, the first right main duct 1r, and the second right main duct 2r.

[0060] Further, as Figure 1-8 shown, among the corresponding left connection hole and the left outer duct of the switch body, the aperture of the left connection hole is smaller than that of the left outer duct; among the corresponding right connection hole and the right outer duct of the switch body, the aperture of the right connection hole is smaller than that of the right outer duct. Of course, the size relationship between the aperture of the left connection hole and the corresponding left outer duct can be adjusted according to actual needs. For example, the apertures of the two can be the same, or the latter is smaller than the former; the size relationship between the aperture of the right connection hole and the corresponding right outer duct can be adjusted according to actual needs. For example, the apertures of the two can be the same, or the latter is smaller than the former.

[0061] Specifically, as Figure 1-8 shown, the aperture of the A-layer left connection hole 1-10c is smaller than that of the B-layer left outer duct 2-10o; the aperture of the A-layer right connection hole 1-11c is smaller than that of the B-layer right outer duct 2-11o; the aperture of the B-layer left connection hole 2-10c is smaller than that of the A-layer left outer duct 1-10o; the aperture of the B-layer right connection hole 2-11c is smaller than that of the A-layer right outer duct 1-11o.

[0062] Further, as Figure 3-4 shown in FIGS. 7-8, the unit housing is provided with a shaft hole for rotatably mounting the moving contact mechanism, and the axes of the shaft holes of each unit housing coincide and are parallel to the first direction; in the unit housing, the left outer duct and the left connection hole are centrosymmetric structures with the axis of the shaft hole as the central symmetry axis, and are centrosymmetric with the right outer duct and the right connection hole. The above structural design is beneficial to improving the aesthetic appearance of the disconnecting switch of the present invention.

[0063] Specifically, as Figure 3-4 shown, the shaft hole of the A shell 1 is the A-layer shaft hole 1-9; as Figure 7-8 shown, the shaft hole of the B shell 2 is the B-layer shaft hole 2-9; the left outer pipe 1-10o and the left connection hole 1-10c of the A layer are symmetrically structured with the right outer pipe 1-11o and the right connection hole 1-11c of the A layer centered on the axis of the A-layer shaft hole 1-9; the left outer pipe 2-10o and the left connection hole 2-10c of the B layer are symmetrically structured with the right outer pipe 2-11o and the right connection hole 2-11c of the B layer centered on the axis of the B-layer shaft hole 2-9.

[0064] Furthermore, as Figure 1-8 shown, the unit shell further includes a left inner air duct provided between the left arc extinguishing system and the side wall of the unit shell, and a right inner air duct provided between the right arc extinguishing system and the side wall of the unit shell. The left inner air duct communicates with the external environment through a left outlet, and the right inner air duct communicates with the external environment through a right outlet. The left inner air duct is arranged in the left arc extinguishing area, and the right inner air duct is arranged in the right arc extinguishing area. Furthermore, the left inner air duct communicates with the external environment through the left outlet and the left outer pipe in sequence; the right inner air duct communicates with the external environment through the right outlet and the right outer pipe in sequence.

[0065] Furthermore, the unit shell further includes a left flow guiding structure arranged in the left arc extinguishing area and a right flow guiding structure arranged in the right arc extinguishing area; the left flow guiding structure includes a first left guide plate, the first left guide plate is arranged inside the left outlet and is spaced relatively from it, and both ends of the first left guide plate extend beyond both ends of the left outlet in the width direction of the left outlet; the right flow guiding structure includes a first right guide plate, the first right guide plate is arranged inside the right outlet and is spaced relatively from it, and both ends of the first right guide plate extend beyond both ends of the right outlet in the width direction of the right outlet. The first left guide plate and the first right guide plate can prevent the arc gas from passing straight through the left outlet and the right outlet, extend the path of the arc gas flowing from the left arc extinguishing system and the right arc extinguishing system to the left outlet and the right outlet, and eliminate or significantly reduce the possibility of arc flash escaping from the left outlet and the right outlet. It should be noted that the first direction is the height direction of the left outlet and the right outlet, and the direction in which the front side wall and the rear side wall of the unit shell face each other is the width direction of the left outlet and the right outlet, that is, the width direction of the left outlet and the right outlet is perpendicular to the first direction. Furthermore, a first left protrusion is provided on the side of the first left guide plate facing the left outlet, the first left protrusion is a wedge-shaped structure and protrudes towards the left outlet; a first right protrusion is provided on the side of the first right guide plate facing the right outlet, the first right protrusion is a wedge-shaped structure and protrudes towards the right outlet. The first left protrusion and the first right protrusion are conducive to guiding the arc gas to enter the left outlet and the right outlet more smoothly.

[0066] Further, the middle part of the first left guide plate facing the left arc extinguishing system abuts against the left arc extinguishing system, and both ends are spaced from the air outlet of the left arc extinguishing system; the middle part of the first right guide plate facing the right arc extinguishing system abuts against the right arc extinguishing system, and both ends are spaced from the air outlet of the right arc extinguishing system; with the above design, the arc gases ejected from the air outlets of the left arc extinguishing system and the right arc extinguishing system can be forced to be divided into two streams respectively, increasing the flow path of the arc gas flow.

[0067] As other embodiments of the first left guide plate and the second left guide plate, the side of the first left guide plate facing the left arc extinguishing system is relatively spaced from the air outlet of the left arc extinguishing system, and the side of the first right guide plate facing the right arc extinguishing system is relatively spaced from the air outlet of the right arc extinguishing system.

[0068] Specifically, as Figure 1-4 shown, the left inner air duct, the left diversion structure, the first left guide plate, the first left protrusion, the right inner air duct, the right diversion structure, the first right guide plate, and the first right protrusion of the A shell 1 are respectively the A-layer left inner air duct 1-10i, the A-layer left diversion structure 1-50, the A-layer first left guide plate 1-500, the A-layer first left protrusion, the A-layer right inner air duct 1-11i, the A-layer right diversion structure 1-51, the A-layer first right guide plate 1-510, and the A-layer first right protrusion; the left inner air duct, the left diversion structure, the first left guide plate, the first left protrusion, the right inner air duct, the right diversion structure, the first right guide plate, and the first right protrusion of the B shell 2 are respectively the B-layer left inner air duct 2-10i, the B-layer left diversion structure 2-50, the B-layer first left guide plate 2-500, the B-layer first left protrusion, the B-layer right inner air duct 2-11i, the B-layer right diversion structure 2-51, the B-layer first right guide plate 2-510, and the B-layer first right protrusion.

[0069] Further, the left diversion structure is arranged inside the left inner air duct, and the right diversion structure is arranged inside the right inner air duct; the left diversion structure includes a plurality of left guide plates, and a left channel is formed between adjacent left guide plates, with one end facing the left arc extinguishing system and the other end facing the left side wall. The left guide plate opposite to the left outlet is the first left guide plate; the right diversion structure includes a plurality of right guide plates, and a right channel is formed between adjacent right guide plates, with one end facing the right arc extinguishing system and the other end facing the right side wall. The right guide plate opposite to the right outlet is the first right guide plate. The left arc extinguishing system and the right arc extinguishing system respectively enter the wide left inner air duct and right inner air duct through the narrow left channel and right channel, so that the arc gas is compressed and expanded during the flow process, which is beneficial to further extinguishing the arcs that have not been successfully extinguished in the left arc extinguishing system and the right arc extinguishing system, improving the arc extinguishing performance of the switch unit; moreover, the left diversion structure and the right diversion structure realize the combing of the arc gas, enabling the arc gas to flow more smoothly and be discharged from the switch unit.

[0070] Further, the left flow guiding structure is also in limit cooperation with the left arc extinguishing system to limit the left arc extinguishing system at a preset position; the right flow guiding structure is also in limit cooperation with the right arc extinguishing system to limit the right arc extinguishing system at a preset position.

[0071] As Figure 1-2 As shown in FIGS. 5-6, both the left arc extinguishing system and the right arc extinguishing system are C-shaped structures, which are arranged around the moving contact mechanism; one end of each arc extinguishing system extends to the corresponding static contact, and the other end extends to the disconnection position of the corresponding moving contact part; the disconnection position of the moving contact part refers to the position where the moving contact part is located when the moving contact mechanism moves to the disconnection position.

[0072] As Figure 1-2 As shown in FIGS. 5-6, in the rotation direction of the moving contact mechanism, both ends of the left inner air duct extend to both ends of the left arc extinguishing system (specifically, both ends of the left inner air duct extend to both ends of the air outlet of the left arc extinguishing system), and the left outlet is arranged on one side of the middle of the left inner air duct; both ends of the right inner air duct extend to both ends of the right arc extinguishing system (specifically, both ends of the right inner air duct extend to both ends of the air outlet of the right arc extinguishing system), and the right outlet is arranged on one side of the middle of the right inner air duct.

[0073] Specifically, in the rotation direction of the A-layer moving contact mechanism 1-3, both ends of the A-layer left inner air duct 1-10i extend to both ends of the A-layer left arc extinguishing system 1-20, and both ends of the A-layer right inner air duct 1-11i extend to both ends of the A-layer right arc extinguishing system 1-21; in the rotation direction of the B-layer moving contact mechanism 2-3, both ends of the B-layer left inner air duct 2-10i extend to both ends of the B-layer left arc extinguishing system 2-20, and both ends of the B-layer right inner air duct 2-11i extend to both ends of the B-layer right arc extinguishing system 2-21; the rotation direction of the A-layer moving contact mechanism 1-3 is the same as that of the B-layer moving contact mechanism 2-3.

[0074] Further, each of the arc extinguishing systems includes at least two arc extinguishing chambers disposed around the moving contact mechanism. Further, the arc inlet of at least one arc extinguishing chamber of the left arc extinguishing system is directly communicated with the left inner air passage through the left passage; the arc inlet of at least one arc extinguishing chamber of the right arc extinguishing system is directly communicated with the right inner air passage through the right passage; thus, when there is too much arc generated between the moving contact mechanism and the static contact, it is beneficial to transfer the arc away from the contact system in time, avoiding or reducing the damage of the contact system by the arc. Further, in each of the arc extinguishing systems, any two adjacent arc extinguishing chambers form a group of arc extinguishing chambers; in the left arc extinguishing system, a gap communicating with the arc inlets of the two arc extinguishing chambers is formed between the adjacent ends of at least one group of arc extinguishing chambers, and the gap is communicated with the left inner air passage through the corresponding left passage; in the right arc extinguishing system, a gap communicating with the arc inlets of the two arc extinguishing chambers is formed between the adjacent ends of at least one group of arc extinguishing chambers, and the gap is communicated with the right inner air passage through the corresponding left passage. Further, in the group of arc extinguishing chambers, one end of the two arc extinguishing chambers abuts against each other, and preferably, a corner of one end of one arc extinguishing chamber abuts against the middle of one end of the other arc extinguishing chamber.

[0075] Specifically, each of the arc extinguishing systems includes three arc extinguishing chambers arranged around the moving contact mechanism; the three arc extinguishing chambers of the left arc extinguishing system are the first left arc extinguishing chamber, the second left arc extinguishing chamber, and the third left arc extinguishing chamber arranged in sequence. The first left arc extinguishing chamber is arranged close to the corresponding static contact, and the third left arc extinguishing chamber is arranged close to the disconnection position of the corresponding moving contact part; the three arc extinguishing chambers of the right arc extinguishing system are the first right arc extinguishing chamber, the second right arc extinguishing chamber, and the third right arc extinguishing chamber arranged in sequence. The first right arc extinguishing chamber is arranged close to the corresponding static contact, and the third right arc extinguishing chamber is arranged close to the disconnection position of the corresponding moving contact part; that is, the first left arc extinguishing chamber, the second left arc extinguishing chamber, the third left arc extinguishing chamber, the first right arc extinguishing chamber, the second right arc extinguishing chamber, and the third right arc extinguishing chamber are arranged in sequence around the moving contact mechanism. Further, the three arc extinguishing chambers of the left arc extinguishing system are directly communicated with the left inner air passage through the corresponding left channels respectively; the three arc extinguishing chambers of the right arc extinguishing system are directly communicated with the right inner air passage through the corresponding right channels respectively. Further, in the left arc extinguishing system, a notch is formed at one adjacent end of each two arc extinguishing chambers of each arc extinguishing chamber group. The notch is communicated with the arc entrances of the two arc extinguishing chambers and is relatively communicated with one end of the corresponding left channel; in the right arc extinguishing system, a notch is formed at one adjacent end of each two arc extinguishing chambers of each arc extinguishing chamber group. The notch is communicated with the arc entrances of the two arc extinguishing chambers and is relatively communicated with one end of the corresponding right channel. Further, in the left arc extinguishing system, in the arc extinguishing chamber group composed of the first left arc extinguishing chamber and the second left arc extinguishing chamber, one edge of one end of the first left arc extinguishing chamber (this edge is preferably the edge close to the arc entrance of the first left arc extinguishing chamber) abuts against the middle of one end of the second arc extinguishing chamber. In the arc extinguishing chamber group composed of the second left arc extinguishing chamber and the third left arc extinguishing chamber, one edge of one end of the third left arc extinguishing chamber (this edge is preferably the edge close to the arc entrance of the third left arc extinguishing chamber) abuts against the middle of the other end of the second arc extinguishing chamber. In the right arc extinguishing system, a notch is formed at one adjacent end of each two arc extinguishing chambers of each arc extinguishing chamber group. The notch is communicated with the arc entrances of the two arc extinguishing chambers and is relatively communicated with one end of the corresponding right channel; in the right arc extinguishing system, a notch is formed at one adjacent end of each two arc extinguishing chambers of each arc extinguishing chamber group. The notch is communicated with the arc entrances of the two arc extinguishing chambers and is relatively communicated with one end of the corresponding right channel. Further, in the right arc extinguishing system, in the arc extinguishing chamber group composed of the first right arc extinguishing chamber and the second right arc extinguishing chamber, one edge of one end of the first right arc extinguishing chamber (this edge is preferably the edge close to the arc entrance of the first right arc extinguishing chamber) abuts against the middle of one end of the second arc extinguishing chamber. In the arc extinguishing chamber group composed of the second right arc extinguishing chamber and the third right arc extinguishing chamber, one edge of one end of the third right arc extinguishing chamber (this edge is preferably the edge close to the arc entrance of the third right arc extinguishing chamber) abuts against the middle of the other end of the second arc extinguishing chamber.

[0076] Further, in the left arc extinguishing system, the structures of the arc extinguishing chambers are the same; in the right arc extinguishing system, the structures of the arc extinguishing chambers are the same; in this embodiment, the arc extinguishing chambers of the left arc extinguishing system are preferably the same as those of the right arc extinguishing system; this is beneficial to reducing the types of components of the disconnector of the present invention, reducing the manufacturing cost, and simplifying the assembly operation. The arc extinguishing chamber of the A-layer left arc extinguishing system 1-20 is the A-layer left arc extinguishing chamber 1-200, and the arc extinguishing chamber of the A-layer right arc extinguishing system 1-21 is the A-layer right arc extinguishing chamber 1-210; the arc extinguishing chamber of the B-layer left arc extinguishing system 2-20 is the B-layer left arc extinguishing chamber 2-200, and the arc extinguishing chamber of the B-layer right arc extinguishing system 2-21 is the B-layer right arc extinguishing chamber 2-210.

[0077] As Figure 10 shown, it is the first embodiment of the arc extinguishing chamber.

[0078] The arc extinguishing chamber of this embodiment includes arc extinguishing side plates 3-0 and arc extinguishing grid plates 3-1. Two arc extinguishing side plates 3-0 are arranged relatively at intervals, and multiple arc extinguishing chamber grid plates 3-1 are arranged side by side at intervals, and both ends of each arc extinguishing grid plate 3-1 are fixedly connected to the two arc extinguishing side plates 3-0 respectively. Further, in the arc extinguishing chamber of this embodiment, the distance between adjacent arc extinguishing grid plates 3-1 is smaller than that of the adjacent arc extinguishing grid plates of the existing arc extinguishing chamber. The distance between adjacent arc extinguishing grid plates 3-1 is preferably 0.65 - 0.9 mm. When the distance < 0.65 mm, it affects the entry of the arc into the arc extinguishing chamber and the gas flow. When the distance > 0.9 mm, the space utilization rate becomes poor, resulting in insufficient number of grid plates and affecting the arc cutting efficiency.

[0079] As Figure 11 shown, it is the second embodiment of the arc extinguishing chamber.

[0080] Compared with the arc extinguishing chamber of the first embodiment, the arc extinguishing chamber of this embodiment further includes an arc extinguishing back plate 3-2. The arc extinguishing back plate 3-2 is arranged on the air outlet side of the arc extinguishing chamber. The two arc extinguishing side plates 3-0 and the arc extinguishing back plate 3-2 form a U-shaped structure as a whole. Each arc extinguishing grid plate 3-1 is arranged in this U-shaped structure. The arc extinguishing back plate 3-2 is provided with a plurality of air outlet holes, and the size of each air outlet hole is the same as or substantially the same as the size of the gap between adjacent arc extinguishing grid plates 3-1.

[0081] As Figure 12 shown, it is the third embodiment of the arc extinguishing chamber.

[0082] Compared with the arc extinguishing chamber of the second embodiment, the arc extinguishing back plate 3-2 of the arc extinguishing chamber of this embodiment is a square frame structure, and a large opening is provided in the middle thereof. The large opening is relatively communicated with the gap between each arc extinguishing grid plate 3-1.

[0083] Further, as Figure 1-8As shown, the left flow guiding structure further includes a second left guide plate, a third left guide plate, a fourth left guide plate, a fifth left guide plate, a sixth left guide plate, and a seventh left guide plate. The air outlet of the first left arc extinguishing chamber faces the rear side wall of the unit housing. The second left guide plate is arranged on the rear side wall of the unit housing. The third left guide plate is arranged on one side of the end of the first left arc extinguishing chamber close to the second left arc extinguishing chamber. One end of the left channel between the second left guide plate and the third left guide plate is communicated with the air outlet of the first left arc extinguishing chamber and the other end faces the left side wall. The fourth left guide plate is arranged on one side of the end of the second left arc extinguishing chamber close to the first left arc extinguishing chamber. One end of the left channel between the third left guide plate and the fourth left guide plate is communicated with the arc inlets of the first left arc extinguishing chamber and the second left arc extinguishing chamber and the other end faces the left side wall. The third left guide plate and the fourth left guide plate are preferably of an integral structure. The two are integrally in a V-shaped structure and a notch or an opening is arranged at the connection between the two to form the left channel. Of course, the third left guide plate and the fourth left guide plate can also be two independent structures. The first left guide plate is arranged on the side of the air outlet of the second left arc extinguishing chamber and is located between the left side wall and the air outlet of the second left arc extinguishing chamber. That is, the air outlet of the second left arc extinguishing chamber faces the left side wall. One end of the left channel between the fourth left guide plate and the first left guide plate is communicated with the air outlet of the second left arc extinguishing chamber and the other end faces the left side wall. The fifth left guide plate is arranged on one side of the end of the second left arc extinguishing chamber close to the third left arc extinguishing chamber. One end of the left channel between the first left guide plate and the fourth left guide plate is communicated with the air outlet of the second left arc extinguishing chamber and the other end faces the left side wall. The sixth left guide plate is arranged on one side of the end of the third left arc extinguishing chamber close to the second left arc extinguishing chamber. One end of the left channel between the fifth left guide plate and the sixth left guide plate is communicated with the arc inlets of the second left arc extinguishing chamber and the third left arc extinguishing chamber and the other end faces the left side wall. The fifth left guide plate and the sixth left guide plate are preferably of an integral structure. The two are integrally in a V-shaped structure and a notch or an opening is arranged at the connection between the two to form the left channel. Of course, the fifth left guide plate and the sixth left guide plate can also be two independent structures. The air outlet of the third left arc extinguishing chamber faces the connection between the left side wall and the front side wall of the unit housing. The seventh left guide plate is arranged in the included angle between the left side wall and the front side wall. One end of the left channel between the seventh left guide plate and the sixth left guide plate is communicated with the air outlet of the third left arc extinguishing chamber and the other end faces the left side wall. One end of the seventh left guide plate extends to the middle of the air outlet of the third left arc extinguishing chamber. Further, the left flow guiding structure further includes an eighth left guide plate. The eighth left guide plate is arranged between the seventh left guide plate and the front side wall. One end of the left channel between the seventh left guide plate and the eighth left guide plate faces the left side wall and the other end is communicated with the air outlet of the third left arc extinguishing chamber. Further, one edge of the first left arc extinguishing chamber abuts against the middle of one end of the second left arc extinguishing chamber and a V-shaped included angle is formed between the two. The third left guide plate and the fourth left guide plate are located in this V-shaped included angle; one edge of the third left arc extinguishing chamber abuts against the middle of the other end of the second left arc extinguishing chamber and a V-shaped included angle is formed between the two. The fifth left guide plate and the sixth left guide plate are located in this V-shaped included angle. The fifth left guide plate and the sixth left guide plate are arranged in a V shape and the opening of this V shape faces the left side wall.

[0084] Further, the third left guide plate and the fourth left guide plate are respectively in limit fit with one end of the first left arc extinguishing chamber close to the second left arc extinguishing chamber, the fourth left guide plate is in limit fit with one end of the second left arc extinguishing chamber close to the first left arc extinguishing chamber, the first left guide plate is in limit fit with one side of the second left arc extinguishing chamber facing the left side wall, the fifth left guide plate is in limit fit with one end of the second left arc extinguishing chamber close to the third left arc extinguishing chamber, and the sixth left guide plate is in limit fit with one end of the third left arc extinguishing chamber close to the second left arc extinguishing chamber.

[0085] Further, as Figure 1-8As shown, the right flow guiding structure further includes a second right guide plate, a third right guide plate, a fourth right guide plate, a fifth right guide plate, a sixth right guide plate, and a seventh right guide plate. The air outlet of the first right arc extinguishing chamber faces the rear side wall of the unit housing. The second right guide plate is arranged on the rear side wall of the unit housing. The third right guide plate is arranged on one side of the first right arc extinguishing chamber near one end close to the second right arc extinguishing chamber. One end of the right channel between the second right guide plate and the third right guide plate is communicated with the air outlet of the first right arc extinguishing chamber and the other end faces the right side wall. The fourth right guide plate is arranged on one side of the second right arc extinguishing chamber near one end close to the first right arc extinguishing chamber. One end of the right channel between the third right guide plate and the fourth right guide plate is communicated with the arc inlets of the first right arc extinguishing chamber and the second right arc extinguishing chamber and the other end faces the right side wall. The third right guide plate and the fourth right guide plate are preferably of an integral structure. The two are integrally in a V-shaped structure and a notch or an opening is arranged at the connection part of the two to form the right channel. Of course, the third right guide plate and the fourth right guide plate can also be two independent structures. The first right guide plate is arranged on one side of the air outlet of the second right arc extinguishing chamber and is located between the right side wall and the air outlet of the second right arc extinguishing chamber. That is to say, the air outlet of the second right arc extinguishing chamber faces the right side wall. One end of the right channel between the fourth right guide plate and the first right guide plate is communicated with the air outlet of the second right arc extinguishing chamber and the other end faces the right side wall. The fifth right guide plate is arranged on one side of the second right arc extinguishing chamber near one end close to the third right arc extinguishing chamber. One end of the right channel between the first right guide plate and the fourth right guide plate is communicated with the air outlet of the second right arc extinguishing chamber and the other end faces the right side wall. The sixth right guide plate is arranged on one side of the third right arc extinguishing chamber near one end close to the second right arc extinguishing chamber. One end of the right channel between the fifth right guide plate and the sixth right guide plate is communicated with the arc inlets of the second right arc extinguishing chamber and the third right arc extinguishing chamber and the other end faces the right side wall. The fifth right guide plate and the sixth right guide plate are preferably of an integral structure. The two are integrally in a V-shaped structure and a notch or an opening is arranged at the connection part of the two to form the right channel. Of course, the fifth right guide plate and the sixth right guide plate can also be two independent structures. The air outlet of the third right arc extinguishing chamber faces the connection part of the right side wall and the front side wall of the unit housing. The seventh right guide plate is arranged in the included angle between the right side wall and the front side wall. One end of the right channel between the seventh right guide plate and the sixth right guide plate is communicated with the air outlet of the third right arc extinguishing chamber and the other end faces the right side wall. One end of the seventh right guide plate extends to the middle of the air outlet of the third right arc extinguishing chamber. Further, the right flow guiding structure further includes an eighth right guide plate. The eighth right guide plate is arranged between the seventh right guide plate and the rear side wall. One end of the right channel between the seventh right guide plate and the eighth right guide plate faces the right side wall and the other end is communicated with the air outlet of the third right arc extinguishing chamber. It should be noted that the eighth right guide plate is not necessarily arranged, but is set or cancelled according to the internal space of the unit housing. Moreover, if the internal space of the unit housing permits, more left guide plates and right guide plates can be respectively arranged for the left flow guiding structure and the right flow guiding structure.Further, one edge of the first right arc extinguishing chamber abuts against the middle of one end of the second left arc extinguishing chamber, forming a V-shaped angle therebetween, and the third right guide plate and the fourth right guide plate are located within this V-shaped angle; one edge of the third right arc extinguishing chamber abuts against the middle of the other end of the second right arc extinguishing chamber, forming a V-shaped angle therebetween, and the fifth right guide plate and the sixth right guide plate are located within this V-shaped angle. The fifth right guide plate and the sixth right guide plate are arranged in a V shape, and the opening of this V shape faces the right side wall.

[0086] Further, the third right guide plate and the fourth right guide plate are respectively in limit cooperation with one end of the first right arc extinguishing chamber close to the second right arc extinguishing chamber, the fourth right guide plate is in limit cooperation with one end of the second right arc extinguishing chamber close to the first right arc extinguishing chamber, the first right guide plate is in limit cooperation with one side of the second right arc extinguishing chamber facing the right side wall, the fifth right guide plate is in limit cooperation with one end of the second right arc extinguishing chamber close to the third right arc extinguishing chamber, and the sixth right guide plate is in limit cooperation with one end of the third right arc extinguishing chamber close to the second right arc extinguishing chamber.

[0087] Specifically, as Figure 1-4 shown, the first left guide plate, the second left guide plate, the third left guide plate, the fourth left guide plate, the fifth left guide plate, the sixth left guide plate, the seventh left guide plate, and the eighth left guide plate of the left flow guiding structure of the A shell 1 are respectively the first left guide plate 1-500 of layer A, the second left guide plate 1-501 of layer A, the third left guide plate 1-502 of layer A, the fourth left guide plate 1-503 of layer A, the fifth left guide plate 1-504 of layer A, the sixth left guide plate 1-505 of layer A, the seventh left guide plate 1-506 of layer A, and the eighth left guide plate 1-507 of layer A; the first right guide plate, the second right guide plate, the third right guide plate, the fourth right guide plate, the fifth right guide plate, the sixth right guide plate, and the seventh right guide plate of the right flow guiding structure of the A shell 1 are respectively the first right guide plate 1-510 of layer A, the second right guide plate 1-511 of layer A, the third right guide plate 1-512 of layer A, the fourth right guide plate 1-513 of layer A, the fifth right guide plate 1-514 of layer A, the sixth right guide plate 1-515 of layer A, and the seventh right guide plate 1-516 of layer A; the eighth right guide plate is not provided in the right flow guiding structure of the A shell 1. As Figure 5-6As shown, the first left guide plate, the second left guide plate, the third left guide plate, the fourth left guide plate, the fifth left guide plate, the sixth left guide plate, the seventh left guide plate, and the eighth left guide plate of the left flow guiding structure of the B shell 1 are respectively the first left guide plate 2-500 of layer B, the second left guide plate 2-501 of layer B, the third left guide plate 2-502 of layer B, the fourth left guide plate 2-503 of layer B, the fifth left guide plate 2-504 of layer B, the sixth left guide plate 2-505 of layer B, the seventh left guide plate 2-506 of layer B, and the eighth left guide plate 2-507 of layer B; the first right guide plate, the second right guide plate, the third right guide plate, the fourth right guide plate, the fifth right guide plate, the sixth right guide plate, the seventh right guide plate, and the eighth right guide plate of the right flow guiding structure of the B shell 1 are respectively the first right guide plate 2-510 of layer B, the second right guide plate 2-511 of layer B, the third right guide plate 2-512 of layer B, the fourth right guide plate 2-513 of layer B, the fifth right guide plate 2-514 of layer B, the sixth right guide plate 2-515 of layer B, the seventh right guide plate 2-516 of layer B, and the eighth right guide plate 2-517 of layer B.

[0088] Furthermore, when ignoring the differences of the eighth right guide plate, the left flow guiding structure and the right flow guiding structure are centrosymmetric structures with the rotation axis of the moving contact mechanism as the central symmetry axis, which is beneficial to simplifying the internal structure of the unit shell and enabling the mutual replacement and use of the left arc extinguishing system and the right arc extinguishing system.

[0089] As Figure 1-8 shown, the unit shell further includes a partition part. The two partition parts are respectively located on the radial two sides of the moving contact mechanism. One ends of the two partition parts are respectively connected to the front side wall and the rear side wall of the unit shell, and the other ends are respectively cooperated with the moving contact mechanism to divide the internal space of the unit shell into two sub-spaces. The left arc extinguishing area and the right arc extinguishing area are respectively located in the two sub-spaces. The two moving contact parts are respectively located in the two sub-spaces. The parts of the two static contacts that contact the moving contact structure are respectively located in the two sub-spaces.

[0090] Specifically, the two partition parts of the A shell 1 are respectively the first partition part 1-70 of layer A and the second partition part 1-71 of layer A; the two partition parts of the B shell 2 are respectively the first partition part 2-70 of layer B and the second partition part 2-71 of layer B.

[0091] As Figure 3-4 shown in FIGS. 7-8, the unit shell further includes a static contact position arranged therein. The part of the static contact for contacting the moving contact mechanism is carried in the static contact position. Each static contact position is adjacent to a partition part.

[0092] Specifically, the two static contact positions of the A shell 1 are the first static contact position 1-80 of the A layer and the second static contact position 1-80 of the A layer, which are respectively arranged adjacent to the first partition 1-70 of the A layer and the second partition 1-71 of the A layer; the two static contact positions of the B shell 2 are the first static contact position 2-80 of the B layer and the second static contact position 2-81 of the B layer, which are respectively arranged adjacent to the first partition 2-70 of the B layer and the second partition 2-71 of the B layer.

[0093] As Figure 1-2 shown in FIGS. 3-4 and 9, in two adjacent groups of switch units of the switch body, the two moving contact mechanisms are arranged side by side in the first direction. The two static contacts of each group of switch units are respectively the first static contact and the second static contact arranged on the radial two sides of the corresponding moving contact mechanism. Each static contact includes a static contact part for contacting and conducting with the corresponding moving contact part and a wiring part for electrically connecting with the external circuit; in the projection of the switch body perpendicular to the first direction, the two first static contacts form a pair of contacts, and the two second static contacts form a pair of contacts. The static contact parts of each pair of contacts overlap each other, and the two static contacts of at least one pair of contacts overlap each other.

[0094] Specifically, in the disconnector of the present invention, in the projection of the switch body perpendicular to the first direction, the wiring parts of the two first static contacts are arranged side by side at intervals, and the two second static contacts overlap each other. Further, the unit shell further includes a phase separator for separating the second static contacts of two adjacent switch units.

[0095] Specifically, the phase separator of the A shell 1 is the phase separator 1-6 of the A layer; the phase separator of the B shell 2 is the phase separator 2-6 of the B layer.

[0096] The disconnector of the present invention further includes an exhaust structure. The exhaust structure includes the A shell 1 and the B shell 2. The A shell 1 includes a left arc extinguishing area 1-0a of the A layer, a right arc extinguishing area 1-1a of the A layer, a left outlet 1-10g of the A layer, and a right outlet 1-11g of the A layer. The B shell 2 includes a left arc extinguishing area 2-0a of the B layer, a right arc extinguishing area 2-1a of the B layer, a left outlet 2-10g of the B layer, and a right outlet 2-11g of the B layer. Further, the exhaust structure further includes a left connection hole 1-10c of the A layer and a right connection hole 1-11c of the A layer of the A shell 1, a left connection hole 2-10c of the B layer and a right connection hole 2-11c of the B layer of the B shell 2. Further, the exhaust structure further includes a first left guide plate 1-500 of the A layer of the left flow guiding structure 1-50 of the A layer, a first right guide plate 1-510 of the A layer of the right flow guiding structure 1-51 of the A layer, a first left guide plate 2-500 of the B layer of the left flow guiding structure 2-50 of the B layer, and a first right guide plate 2-510 of the B layer of the right flow guiding structure 2-51 of the B layer. For the cooperation relationship of each structure of the exhaust structure, refer to the description in the foregoing text.

[0097] It should be noted that in the description of the present utility model, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which it is usually placed during use. It is only for the convenience of description and does not indicate that the device or element referred to must have a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be construed as indicating relative importance.

[0098] The above content is a further detailed description of the present utility model in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present utility model is only limited to these descriptions. For those of ordinary skill in the technical field to which the present utility model belongs, without departing from the concept of the present utility model, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the protection scope of the present utility model.

Claims

1. A switch unit of an isolating switch, comprising a unit housing, an arc extinguishing system and a contact system arranged in the unit housing; the contact system comprises a rotatably arranged moving contact mechanism and two groups of stationary contacts, the moving contact mechanism comprises two groups of moving contact portions, the two groups of moving contact portions respectively cooperate with the two groups of stationary contacts to form two groups of contact pairs, and the two groups of arc extinguishing systems are a left arc extinguishing system and a right arc extinguishing system respectively cooperate with the two groups of contact pairs; The unit shell includes a left inner air duct arranged between the left arc extinguishing system and the side wall of the unit shell, a right inner air duct arranged between the right arc extinguishing system and the side wall of the unit shell, a left outlet arranged on the left side wall of the unit shell for connecting the left inner air duct with the external environment, and a right outlet arranged on the right side wall of the unit shell for connecting the right inner air duct with the external environment; Features: The unit shell also includes a left guide structure arranged in the left inner air duct and spaced apart from the left side wall, and a right guide structure arranged in the right inner air duct and spaced apart from the right side wall. The left guide structure includes a plurality of left guide plates, and a left channel with one end facing the left arc extinguishing system and the other end facing the left side wall is formed between adjacent left guide plates. The left guide plate opposite to the left air outlet is a first left guide plate, and both ends of the first left guide plate exceed both ends of the left air outlet in the width direction of the left air outlet. The right guide structure includes a plurality of right guide plates, and a right channel with one end facing the right arc extinguishing system and the other end facing the right side wall is formed between adjacent right guide plates. The right guide plate opposite to the right outlet is a first right guide plate, and both ends of the first right guide plate exceed both ends of the right outlet in the width direction of the right outlet.

2. The switch unit of the isolating switch according to claim 1, characterized in that: The left flow guide structure also cooperates with the left arc extinguishing system limiter to limit the left arc extinguishing system at a preset position; the right flow guide structure also cooperates with the right arc extinguishing system limiter to limit the right arc extinguishing system at a preset position.

3. The switch unit of the isolating switch according to claim 1, characterized in that: The first left guide plate includes a first left protrusion arranged on a side thereof facing the left outlet, the first left protrusion is a wedge-shaped protrusion and is arranged to protrude toward the left outlet; the first right guide plate includes a first right protrusion arranged on a side thereof facing the right outlet, the first right protrusion is a wedge-shaped protrusion and is arranged to protrude toward the right outlet.

4. The switch unit of the isolating switch according to claim 1, characterized in that: The middle part of the first left guide plate facing the left arc extinguishing system is against the left arc extinguishing system, and the two ends are spaced apart from the air outlet of the left arc extinguishing system; the middle part of the first right guide plate facing the right arc extinguishing system is against the right arc extinguishing system, and the two ends are spaced apart from the air outlet of the right arc extinguishing system.

5. The switch unit of the isolating switch according to claim 1, characterized in that: The left arc extinguishing system and the right arc extinguishing system are both C-shaped structures, arranged around the moving contact mechanism; one end of each arc extinguishing system extends to the corresponding static contact and the other end extends to the disconnection position of the corresponding moving contact part.

6. The switch unit of the isolating switch according to claim 5, characterized in that: In the rotation direction of the moving contact mechanism, the two ends of the left inner air duct extend to the two ends of the left arc extinguishing system respectively, and the left outlet is arranged on one side of the middle part of the left inner air duct, and the two ends of the right inner air duct extend to the two ends of the right arc extinguishing system respectively, and the right outlet is arranged on one side of the middle part of the right inner air duct.

7. The switch unit of the isolating switch according to claim 6, characterized in that: Each of the arc extinguishing systems includes at least two arc extinguishing chambers arranged around the moving contact mechanism; the arc inlet of at least one arc extinguishing chamber of the left arc extinguishing system is directly connected to the left inner air channel through the left channel; the arc inlet of at least one arc extinguishing chamber of the right arc extinguishing system is directly connected to the right inner air channel through the right channel.

8. The switch unit of the isolating switch according to claim 7, characterized in that: In each of the arc extinguishing systems, any two adjacent arc extinguishing chambers form an arc extinguishing chamber group; in the left arc extinguishing system, a gap connected to the arc inlets of the two arc extinguishing chambers is formed between adjacent ends of the two arc extinguishing chambers of at least one arc extinguishing chamber group, and the gap is connected to the left inner air channel through the corresponding left channel; in the right arc extinguishing system, a gap connected to the arc inlets of the two arc extinguishing chambers is formed between adjacent ends of the two arc extinguishing chambers of at least one arc extinguishing chamber group, and the gap is connected to the right inner air channel through the corresponding right channel.

9. The switch unit of the isolating switch according to claim 7, characterized in that: Each of the arc extinguishing systems includes three arc extinguishing chambers arranged around the moving contact mechanism; the three arc extinguishing chambers of the left arc extinguishing system are the first left arc extinguishing chamber, the second left arc extinguishing chamber and the third left arc extinguishing chamber arranged in sequence, the first left arc extinguishing chamber is arranged close to the corresponding static contact, the third left arc extinguishing chamber is arranged close to the disconnecting position of the corresponding moving contact part, and the arc inlets of the three arc extinguishing chambers are directly connected to the left inner air duct through the corresponding left channels respectively; the right arc extinguishing system includes three arc extinguishing chambers, the first right arc extinguishing chamber, the second right arc extinguishing chamber and the third right arc extinguishing chamber arranged in sequence, the first right arc extinguishing chamber is arranged close to the corresponding static contact, the third right arc extinguishing chamber is arranged close to the disconnecting position of the corresponding moving contact part, and the arc inlets of the three arc extinguishing chambers are directly connected to the right inner air duct through the corresponding right channels respectively.

10. The switch unit of the isolating switch according to claim 9, characterized in that: The left guide structure also includes a second left guide plate, a third left guide plate, a fourth left guide plate, a fifth left guide plate, a sixth left guide plate and a seventh left guide plate. The air outlet of the first left arc extinguishing chamber faces the rear wall of the unit shell. The second left guide plate is arranged on the rear wall of the unit shell. The third left guide plate is arranged on a side of the first left arc extinguishing chamber close to one end of the second left arc extinguishing chamber. One end of the left channel between the second left guide plate and the third left guide plate is connected to the air outlet of the first left arc extinguishing chamber and the other end faces the left side wall. The fourth left guide plate is arranged on a side of the second left arc extinguishing chamber close to one end of the first left arc extinguishing chamber. One end of the left channel between the third left guide plate and the fourth left guide plate is connected to the arc inlet of the first left arc extinguishing chamber and the second left arc extinguishing chamber and the other end faces the left side wall. The first left guide plate is arranged on one side of the air outlet of the second left arc extinguishing chamber and is located between the left side wall and the air outlet of the second left arc extinguishing chamber. The left channel between the fourth left guide plate and the first left guide plate One end of the left channel is connected with the air outlet of the second left arc extinguishing chamber and the other end faces the left side wall, the fifth left guide plate is arranged on the side of the second left arc extinguishing chamber close to one end of the third left arc extinguishing chamber, one end of the left channel between the first left guide plate and the fourth left guide plate is connected with the air outlet of the second left arc extinguishing chamber and the other end faces the left side wall, the sixth left guide plate is arranged on the side of the third left arc extinguishing chamber close to one end of the second left arc extinguishing chamber, one end of the left channel between the fifth left guide plate and the sixth left guide plate is connected with the arc inlet of the second left arc extinguishing chamber and the third left arc extinguishing chamber and the other end faces the left side wall, the air outlet of the third left arc extinguishing chamber faces the connection between the left side wall and the front side wall of the unit shell, the seventh left guide plate is arranged in the angle between the left side wall and the front side wall, one end of the left channel between the seventh left guide plate and the sixth left guide plate is connected with the air outlet of the third arc extinguishing chamber and the other end faces the left side wall, and one end of the seventh left guide plate extends to the middle of the air outlet of the third left arc extinguishing chamber; The right guide structure also includes a second right guide plate, a third right guide plate, a fourth right guide plate, a fifth right guide plate, a sixth right guide plate and a seventh right guide plate. The air outlet of the first right arc extinguishing chamber faces the rear side wall of the unit shell. The second right guide plate is arranged on the rear side wall of the unit shell. The third right guide plate is arranged on the side of the first right arc extinguishing chamber close to one end of the second right arc extinguishing chamber. One end of the right channel between the second right guide plate and the third right guide plate is connected to the air outlet of the first right arc extinguishing chamber and the other end faces the right side wall. The fourth right guide plate is arranged on the side of the second right arc extinguishing chamber close to one end of the first right arc extinguishing chamber. One end of the right channel between the third right guide plate and the fourth right guide plate is connected to the arc inlet of the first right arc extinguishing chamber and the second right arc extinguishing chamber and the other end faces the right side wall. The first right guide plate is arranged on the side of the air outlet of the second right arc extinguishing chamber and is located between the right side wall and the air outlet of the second right arc extinguishing chamber. The right channel between the fourth right guide plate and the first right guide plate One end is connected with the air outlet of the second right arc extinguishing chamber and the other end is toward the right side wall, the fifth right guide plate is arranged on the side of the second right arc extinguishing chamber close to one end of the third right arc extinguishing chamber, one end of the right channel between the first right guide plate and the fourth right guide plate is connected with the air outlet of the second right arc extinguishing chamber and the other end is toward the right side wall, the sixth right guide plate is arranged on the side of the third right arc extinguishing chamber close to one end of the second right arc extinguishing chamber, one end of the right channel between the fifth right guide plate and the sixth right guide plate is connected with the arc inlet of the second right arc extinguishing chamber and the third right arc extinguishing chamber and the other end is toward the right side wall, the air outlet of the third right arc extinguishing chamber is toward the connection between the right side wall and the front side wall of the unit shell, the seventh right guide plate is arranged within the angle between the right side wall and the front side wall, one end of the right channel between the seventh right guide plate and the sixth right guide plate is connected with the air outlet of the third right arc extinguishing chamber and the other end is toward the right side wall, and one end of the seventh right guide plate extends to the middle of the air outlet of the third right arc extinguishing chamber.

11. The switch unit of the isolating switch according to claim 10, characterized in that: The third left guide plate and the fourth left guide plate are respectively limitedly matched with one end of the first left arc extinguishing chamber close to the second left arc extinguishing chamber, the fourth left guide plate is limitedly matched with one end of the second left arc extinguishing chamber close to the first left arc extinguishing chamber, the first left guide plate is limitedly matched with one side of the second left arc extinguishing chamber facing the left side wall, the fifth left guide plate is limitedly matched with one end of the second left arc extinguishing chamber close to the third left arc extinguishing chamber, and the sixth left guide plate is limitedly matched with one end of the third left arc extinguishing chamber close to the second left arc extinguishing chamber; The third right guide plate and the fourth right guide plate are respectively limited and cooperated with one end of the first right arc extinguishing chamber close to the second right arc extinguishing chamber, the fourth right guide plate is limited and cooperated with one end of the second right arc extinguishing chamber close to the first right arc extinguishing chamber, the first right guide plate is limited and cooperated with a side of the second right arc extinguishing chamber facing the right side wall, the fifth right guide plate is limited and cooperated with one end of the second right arc extinguishing chamber close to the third right arc extinguishing chamber, and the sixth right guide plate is limited and cooperated with one end of the third right arc extinguishing chamber close to the second right arc extinguishing chamber.

12. The switch unit of the isolating switch according to claim 1, characterized in that: The unit shell also includes a left outer pipe arranged on the outer side of the left side wall, the left outer pipe extends along the rotation axis of the moving contact mechanism, the left outlet is connected to one side of the left outer pipe, and at least one of the two ends of the left outer pipe is connected to the external environment; the unit shell also includes a right outer pipe arranged on the outer side of the right side wall, the right outer pipe extends along the rotation axis of the moving contact mechanism, the right outlet is connected to one side of the right outer pipe, and at least one of the two ends of the right outer pipe is connected to the external environment.

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