Gas circuit breaker

Abstract

The present invention provides a gas circuit breaker that ensures insulation performance with a simpler structure while seeking miniaturization of the device. In order to solve the above-mentioned problems, the gas circuit breaker of the present invention is characterized in that a high-temperature gas guide portion is provided at an axial end of a fixed-side main conductor and has a plurality of holes for discharging high-temperature gas generated by heating an insulating gas filled in a filling container into the filling container, and each of the plurality of holes is formed in an inclined direction relative to the axial direction of the fixed-side main conductor, the fixed-side main conductor is connected to a fixed-side lead-out conductor connected to a power system, and has an opening for discharging the insulating gas heated and pressurized by an arc generated during disconnection.

Description

Technical Field

[0001] The present invention relates to a gas circuit breaker, and more particularly to a gas circuit breaker suitable for having a high-temperature gas guide having a plurality of holes for discharging high-temperature gas generated by heating insulating gas heated and pressurized by an arc generated during interruption into a filling container. Background Art

[0002] A gas circuit breaker is a device used to interrupt short-circuit currents caused by phase short circuits or ground faults in power systems, and jet-type gas circuit breakers have been widely used.

[0003] The jet-type gas circuit breaker generates a high-pressure airflow by mechanically compressing arc-extinguishing gas using a driving jet cylinder directly connected to the movable arc contact, and the high-pressure airflow is sprayed onto the arc generated between the movable arc contact and the fixed arc contact to cut off the current.

[0004] Generally, it is known that the interruption performance of a gas circuit breaker depends on the pressure increase in the gas chamber. Therefore, in addition to the pressure increase based on the conventional mechanical compression, a gas circuit breaker using thermal gas injection that actively utilizes the heat energy of the arc to increase the pressure is widely used.

[0005] This heat-jet combined gas circuit breaker uses the heat energy of the arc to form the blowing pressure of the arc-extinguishing gas in addition to the pressure based on the mechanical compression, and can reduce the operating energy required for the interruption operation compared with the conventional method of mechanical compression alone.

[0006] Generally, in a thermal jet combined gas circuit breaker, two booster chambers are arranged in series: a fixed-volume booster chamber (called a thermal jet chamber) for taking in the heat energy of the arc when the current is interrupted, and a booster chamber whose volume is reduced by mechanical compression (called a mechanical jet chamber), and the two booster chambers are connected via a check valve.

[0007] The high-temperature gas heated by the arc generated between the movable side arc contact and the fixed side arc contact also includes the high-temperature gas introduced into the hot jet chamber to form the blowing pressure, and finally discharged into the filling container through the inner peripheral space of the conductor on the movable side and the fixed side and the inner peripheral space of the conductor on the movable side and the fixed side.

[0008] When the high-temperature gas heated by the above-mentioned arc is discharged into the inner space around the conductor and the filling container, it is mixed with the low-temperature gas originally existing in the inner space around the conductor and the filling container and is cooled. However, if the high-temperature gas is not sufficiently cooled, the insulation performance between the conductor and the filling container to the ground will be reduced, so the cooling structure of the discharged high-temperature gas becomes important.

[0009] As a structure for promoting cooling of high temperature gas, for example, as described in Patent Document 1, there is known a structure in which a plurality of blades are arranged in a conductor inner space to promote mixing of high temperature gas and low temperature gas by swirling high temperature gas flow in the conductor inner space.

[0010] On the other hand, in the gas circuit breaker described in Patent Document 2, a plurality of gas rectifying parts having a plurality of blade structures for forming swirling flows in the conductor inner space of the fixed body conductor are provided in the flow path so that the swirling directions of the swirling flows are different from each other.

[0011] Prior art literature

[0012] Patent Literature

[0013] Patent Document 1: Japanese Patent Application Laid-Open No. 10-275543

[0014] Patent Document 2: Japanese Patent Application Publication No. 2017-123315

[0015] In the gas circuit breaker described in Patent Document 1, a plurality of blade-shaped exhaust guides are arranged on the fixed body side so as to have a cylindrical shape as a whole, thereby constituting an exhaust pipe.

[0016] However, since the high-temperature gas is exhausted in the circumferential direction with respect to the central axis of the circuit breaker, it is difficult to apply to a case where a high electric field portion such as a base portion of a lead conductor is provided on the circumferential side.

[0017] In the structure of Patent Document 2, since the gas rectifying portion is provided with a plurality of blades, the structure becomes complicated, and since the blades are formed in a thin plate-like structure, it is difficult to maintain the strength of the blade portion.

[0018] Furthermore, since the structure is used to promote mixing of the gas in the fixed support member corresponding to the fixed-side main conductor, when the fixed-side main conductor is discharged into the filling container, it is discharged only from the opening on the side of the fixed support member toward the side. As for mixing of the low-temperature gas between the fixed-side conductor and the filling container, sufficient cooling in the fixed support member is a prerequisite. Summary of the invention

[0019] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a gas circuit breaker capable of ensuring insulation performance with a simpler structure and achieving miniaturization of the device.

[0020] Technical solutions to solve problems

[0021] In order to achieve the above-mentioned object, the gas circuit breaker of the present invention comprises: a filling container filled with an insulating gas with arc extinguishing properties; a fixed-side main conductor connected to a fixed-side lead-out conductor connected to an electric power system, and having an opening for discharging the insulating gas heated and pressurized by an arc generated during disconnection; a movable-side main conductor supported and fixed by an insulating support cylinder arranged inside the filling container and connected to a movable-side lead-out conductor connected to the electric power system, and having an exhaust hole for discharging the insulating gas; a movable-side contact electrically connected to the movable-side lead-out conductor; a fixed-side contact electrically connected to the fixed-side lead-out conductor connected to the electric power system and capable of contacting and separating with the movable-side contact; and a high-temperature gas guide portion provided at an axial end of the fixed-side main conductor, and having a plurality of holes for discharging the high-temperature gas generated by heating the insulating gas into the filling container, wherein the gas circuit breaker sprays the insulating gas toward the arc generated during disconnection to extinguish the arc, and is characterized in that each of the plurality of holes of the high-temperature gas guide portion is formed to be inclined relative to the axial direction of the fixed-side main conductor.

[0022] Furthermore, in order to achieve the above-mentioned object, the gas circuit breaker of the present invention comprises: a filling container filled with an insulating gas having arc extinguishing properties; a fixed-side main conductor connected to a fixed-side lead-out conductor connected to an electric power system, and having an opening for discharging the insulating gas heated and pressurized by an arc generated during disconnection; a movable-side main conductor supported and fixed by an insulating support cylinder arranged inside the filling container and connected to a movable-side lead-out conductor connected to the electric power system, and having an exhaust hole for discharging the insulating gas; a movable-side contact electrically connected to the movable-side lead-out conductor; and a fixed-side contact electrically connected to the electric power system. A fixed-side lead-out conductor connected to the power system is capable of contacting and separating with the movable-side contact; and a high-temperature gas guide portion is arranged at the axial end of the fixed-side main conductor, and has a plurality of holes for discharging the high-temperature gas generated by heating the insulating gas into the filling container, and the gas circuit breaker blows the insulating gas toward the arc generated during the cut-off to extinguish the arc, and is characterized in that the high-temperature gas guide portion is composed of a base and a plurality of holes protruding axially from the base and formed in a tubular shape, and each of the plurality of holes formed in a tubular shape is formed to be inclined relative to the axial direction of the fixed-side main conductor.

[0023] Effects of the Invention

[0024] According to the present invention, it is possible to achieve downsizing of the device while ensuring insulation performance with a simpler structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a cross-sectional view showing a schematic structure of a gas circuit breaker in a closed circuit state according to a first embodiment of the present invention.

[0026] Figure 2 This is a cross-sectional view of the gas circuit breaker showing the flow of insulating gas in the open circuit state of the gas circuit breaker according to the first embodiment of the present invention.

[0027] Figure 3A This is a schematic structural diagram of a high-temperature gas guide unit alone showing a first embodiment of a gas circuit breaker according to the present invention.

[0028] Figure 3B is from Figure 3A Figure viewed in the direction of arrow A.

[0029] Figure 3C It is along Figure 3B Cross-sectional view of line BB′.

[0030] Figure 4 These are views showing the shape of the high-temperature gas guide portion of the gas circuit breaker according to the first embodiment of the present invention from different perspectives in order to facilitate understanding of the positional relationship between the orientations of the plurality of high-temperature gas guide holes and the axial direction of the fixed-side main conductor.

[0031] Figure 5A It is a schematic structural diagram of a high-temperature gas guide unit alone showing a second embodiment of a gas circuit breaker according to the present invention.

[0032] Figure 5B is from Figure 5A Figure viewed in the direction of arrow A.

[0033] Figure 5C It is along Figure 5B Cross-sectional view of line BB′.

[0034] Figure 6 It is a partially cutaway perspective view showing a high-temperature gas guide portion of a third embodiment of a gas circuit breaker according to the present invention.

[0035] Description of Reference Numerals

[0036] 1…operating mechanism; 2…filling container; 3…operating rod; 4…insulating nozzle; 5…movable side main contact; 6…fixed side main contact; 7…insulating support cylinder; 8…fixed side insulating cylinder; 9…movable side main conductor; 10…exhaust hole; 11…movable side arc contact; 12…fixed side arc contact; 13…driving member cover; 14…movable side lead conductor; 15…fixed side lead conductor; 16…shaft exhaust hole; 17…cylinder body; 17a…piston; 18…exhaust shaft; 19…thermal jet chamber; 19a…mechanical jet chamber side periphery of thermal jet chamber; 19b…periphery of thermal jet chamber; 19c…mechanical jet chamber side periphery of thermal jet chamber Mechanical jet chamber side end; 20...fixed side main conductor; 23...flow path of exhaust shaft; 31...arc; 32...mechanical jet chamber; 33...jet piston; 35...inner peripheral space of movable side conductor; 36...first hole; 37...second hole; 40...check valve; 41...stopper; 50...high temperature gas guide portion; 50a...base of high temperature gas guide portion; 51, 51a, 51b, 51c...high temperature gas guide hole, 52, 52a, 52b, 52c...direction of high temperature gas guide hole; 53...axial direction of fixed side main conductor, 54, 55...flow path cross-sectional area of ​​high temperature gas guide hole, 100...gas circuit breaker. DETAILED DESCRIPTION

[0037] Hereinafter, the gas circuit breaker of the present invention will be described based on the illustrated embodiments. In each embodiment described below, the same reference numerals are used for the same components.

[0038] In addition, the "axial direction" in the specification of the present invention refers to the direction of the central axis of the cylinder constituting the fixed side and the movable side main conductors ( Figure 1 In the left and right (horizontal) direction), unless otherwise specified, the term "axial direction" shall have the same meaning.

[0039] Example 1

[0040] Figure 1 and Figure 2 A schematic structure of a first embodiment of a gas circuit breaker 100 according to the present invention is shown. Figure 1 Indicates the closed circuit state of the gas circuit breaker 100, Figure 2 Indicates the open circuit state of the gas circuit breaker 100.

[0041] Figure 1 and Figure 2 The gas circuit breaker 100 of the present embodiment shown is arranged in the middle of an electric power system (high voltage circuit, etc.), and when a short circuit current is generated due to a lightning strike, etc., the power supply of the electric power system is stopped by cutting off the power in the electric power system. Figure 1 and Figure 2 The illustrated gas circuit breaker 100 is an example of a gas circuit breaker of the jet type.

[0042] Figure 1 and Figure 2 The gas circuit breaker 100 of the present embodiment shown in the figure comprises: a filling container 2 filled with an insulating gas having arc extinguishing properties (e.g., sulfur hexafluoride gas); a movable side main conductor 9 supported and fixed by an insulating support cylinder 7 disposed inside the filling container 2 and connected to a movable side lead-out conductor 14 connected to a power system (high voltage circuit), and having a function for discharging an arc 31 generated during disconnection (see Figure 2 ) and an exhaust hole 10 for the insulating gas heated and pressurized by the movable side main conductor 9; an exhaust shaft 18, which is movably arranged in the movable side main conductor 9 along the axial direction, and has an axial exhaust hole 16 for exhausting the heated and pressurized insulating gas; an operating mechanism 1, which is connected to the exhaust shaft 18 and outputs an axial operating force to the exhaust shaft 18 via the operating rod 3; a cylinder 17, which is coaxially connected to the exhaust shaft 18 and can slide on the inner peripheral surface of the movable side main conductor 9 along the axial direction; a jet piston 33, which is fixed to the inside of the movable side main conductor 9 and has an opening in the axial direction of the movable side main conductor 9, so that the exhaust shaft 18 can slide on the inner peripheral surface of the opening; a movable side main contact 5, which is electrically connected to the movable side lead conductor 14 via the cylinder 17 and the movable side main conductor 9; and a fixed side main contact 6, which is electrically connected to the fixed side lead conductor 15 connected to the power system and can contact and separate with the movable side main contact 5.

[0043] In addition, the movable side contact has a movable side main contact 5, an insulating nozzle 4 and a movable side arc contact 11, and the fixed side contact has a fixed side main contact 6 and a fixed side arc contact 12. The movable side arc contact 11 is connected to the operating mechanism 1 via the exhaust shaft 18 and the operating rod 3.

[0044] More specifically, the gas circuit breaker 100 of the present embodiment includes a movable side main conductor 9, an exhaust shaft 18, a cylinder 17, and an injection piston 33, which are arranged inside a filling container 2 filled with an insulating gas having arc extinguishing properties (for example, sulfur hexafluoride gas). Figure 1 as well as Figure 2 The left side of the mobile terminal is provided with a movable side main contact 5 and a movable side arc contact 11 (both equivalent to movable side contacts). These movable side main contacts 5 and movable side arc contacts 11 are electrically connected to a movable side lead-out conductor 14 connected to the power system.

[0045] In addition, the fixed side main contact 6 and the fixed side arc contact 12 (both equivalent to the fixed side contacts) which can contact and separate with the movable side main contact 5 and the movable side arc contact 11 are supported and fixed on the fixed side main conductor 20 supported and fixed by the fixed side insulating tube 8, and are electrically connected to the fixed side lead-out conductor 15 connected to the power system.

[0046] Therefore, when a short-circuit current such as a lightning strike occurs, the movable side main contact 5 and the movable side arc contact 11 separate from the fixed side main contact 6 and the fixed side arc contact 12, thereby stopping the power supply to the power system (this state is Figure 2 ).

[0047] The movable side main conductor 9 is supported and fixed by the insulating support cylinder 7 arranged inside the filling container 2. The movable side main conductor 9 has a cylindrical shape, and the cylinder 17 can slide inside it. In addition, the side surface of the movable side main conductor 9 is formed with an exhaust hole 10 for exhausting the high-temperature and high-pressure insulating gas from the inside of the movable side main conductor 9 to the inside of the filling container 2.

[0048] like Figure 2 As shown, the arc 31 generated when the movable-side arc contact 11 separates from the fixed-side arc contact 12 heats and pressurizes the insulating gas, thereby generating a high-temperature and high-pressure insulating gas.

[0049] The exhaust shaft 18 is a hollow shaft provided coaxially with the movable side main conductor 9 inside the movable side main conductor 9, and a flow path 23 for the high temperature and high pressure gas generated by the arc 31 to flow is formed inside the exhaust shaft 18. Figure 1 and Figure 2 An axial exhaust hole 16 is formed on the side surface of the exhaust shaft 18 on the right side thereof, and the axial exhaust hole 16 is used to discharge the high-temperature, high-pressure gas flowing in the above-mentioned flow path 23 to the outside of the exhaust shaft 18.

[0050] In addition, the exhaust shaft 18 is connected to an operating mechanism 1 (in the exhaust shaft 18) for outputting an operating force in the axial direction of the exhaust shaft 18. Figure 1 and Figure 2 In the embodiment, the operating mechanism 1 is connected to the exhaust shaft 18 via the operating rod 3).

[0051] When a short circuit current occurs, a movement instruction from an output unit (not shown) is input to the operating mechanism 1. According to the movement instruction from the output unit, the operating mechanism 1 moves the exhaust shaft 18 to the rear side ( Figure 1 and Figure 2 The movable side main contact 5 and the movable side arc contact 11 are separated from the fixed side main contact 6 and the fixed side arc contact 12, and the power system is cut off (this state is Figure 2 ).

[0052] The cylinder 17 is coaxially connected to the exhaust shaft 18 , and is slidable inside the cylindrical movable-side main conductor 9 in accordance with the axial movement of the exhaust shaft 18 .

[0053] In addition, on the rear side of the cylinder 17 ( Figure 1 and Figure 2 A piston 17a integrated with the cylinder 17 is arranged on the right side of the cylinder 17, and a mechanical jet chamber 32 is formed between the piston 17a and the jet piston 33 and inside the movable side main conductor 9. Therefore, the cylinder 17 moves backward together with the exhaust shaft 18, so that the insulating gas inside the mechanical jet chamber 32 is compressed.

[0054] In addition, inside the cylinder 17 and on the front side of the piston 17a ( Figure 1 and Figure 2 A hot jet chamber 19 is formed on the left side of the arc 31, and a high-temperature, high-pressure gas generated by the arc 31 is introduced into the hot jet chamber 19.

[0055] The above-mentioned hot jet chamber 19, the mechanical jet chamber 32 and the inner peripheral space 35 of the movable side conductor are connected in series in the order of the hot jet chamber 19, the mechanical jet chamber 32 and the inner peripheral space 35 of the movable side conductor through the first hole 36 and the second hole 37 formed in a manner surrounding the exhaust shaft 18.

[0056] In addition, a check valve 40 is provided at the end of the thermal jet chamber 19 on the mechanical jet chamber 32 side. The check valve 40 operates between the block 41 and the end 19c on the mechanical jet chamber side of the thermal jet chamber 19. The check valve 40 contacts the inner wall of the thermal jet chamber 19, thereby closing the second hole 37.

[0057] In addition, the mechanical jet chamber side outer peripheral portion 19a of the hot jet chamber 19 has an inclination relative to the outer peripheral portion 19b of the hot jet chamber 19 and the mechanical jet chamber side end portion 19c of the hot jet chamber 19. That is, the mechanical jet chamber side outer peripheral portion 19a of the hot jet chamber 19 is formed to be inclined so that the radial length of the hot jet chamber 19 decreases as it moves from the outer peripheral portion 19b of the hot jet chamber 19 toward the mechanical jet chamber side end portion 19c of the hot jet chamber 19.

[0058] In addition, in front of the cylinder 17 ( Figure 1 and Figure 2 The movable side main contact 5 is arranged at the top of the left side of the exhaust shaft 18. Figure 1 and Figure 2 At the top of the left side of the movable side contact 11, a movable side arc contact 11 is arranged in a manner surrounded by the movable side main contact 5.

[0059] The movable arc contact 11 faces the inside of the exhaust shaft 18 (i.e., the flow path 23), and the movable arc contact 11 is covered with a driver cover 13. In addition, a driver cover 13 is provided in front of the cylinder 17 so as to surround the movable arc contact 11 and the fixed arc contact 12. Figure 1 as well as Figure 2 An insulating nozzle 4 is arranged at the top of the left side.

[0060] The jet piston 33 is a disc-shaped piston fixed inside the movable side main conductor 9, and the jet piston 33 has an opening near the center, and the exhaust shaft 18 is inserted into the opening. Thus, the exhaust shaft 18 slides on the inner side surface of the opening of the fixed jet piston 33 and can move in the axial direction.

[0061] On the other hand, on the fixed side, the high-temperature gas generated by the arc 31 generated when the movable side arc contact 11 separates from the fixed side arc contact 12 is discharged into the inner peripheral space of the fixed side main conductor 20 through the space between the inner periphery of the insulating nozzle 4 and the outer periphery of the fixed side arc contact 12.

[0062] In addition, the fixed-side arc contact 12 may be completely fixed or connected to a double drive mechanism that moves in conjunction with the movement of the movable side, but the present invention is applicable to either case.

[0063] Furthermore, the high temperature gas ( Figure 2 The high-temperature gas (indicated by the arrow in the figure) mixes with the low-temperature gas in the fixed-side main conductor 20 while moving in the axial direction to reach the high-temperature gas guide portion 50 (the high-temperature gas guide portion 50 is integral with or separately from the fixed-side main conductor 20. In the present embodiment, the high-temperature gas guide portion 50 is separately from the fixed-side main conductor 20), and is discharged into the filling container 2 through a plurality of high-temperature gas guide holes 51 in a cylindrical shape formed in the high-temperature gas guide portion 50.

[0064] exist Figure 3A , Figure 3B as well as Figure 3C Detailed description of the above-mentioned high temperature gas guide 50 is shown in FIG. Figure 3A 2 is a schematic diagram showing the structure of the high temperature gas guide unit 50 alone. Figure 3B is from Figure 3A The figure is viewed from the direction of arrow A. Figure 3C It is along Figure 3B Cross-sectional view of line BB′.

[0065] like Figure 3A , Figure 3B as well as Figure 3C As shown, the high-temperature gas guide portion 50 of the present embodiment has a plurality of high-temperature gas guide holes 51 (three high-temperature gas guide holes 51a, 51b, and 51c in the present embodiment) in a cylindrical shape formed at approximately equal intervals in the circumferential direction of the high-temperature gas guide portion 50, and the high-temperature gas guide holes 51a, 51b, and 51c are respectively formed in a manner inclined with respect to the axial direction 53 of the fixed-side main conductor 20 in the directions 52a, 52b, and 52c.

[0066] use Figure 4 This is explained. Figure 4 In order to facilitate understanding of the positional relationship between the directions 52a, 52b and 52c of the high-temperature gas guide holes 51a, 51b and 51c and the axial direction 53 of the fixed-side main conductor 20, the high-temperature gas guide holes 51a, 51b and 51c are viewed from different perspectives. Figure 3A , Figure 3B as well as Figure 3C FIG. 1 is a diagram showing the shape of the hot gas guide 50 .

[0067] like Figure 4 As shown, in the present embodiment, it is characterized in that the high-temperature gas guide holes 51a, 51b and 51c formed at approximately equal intervals in the circumferential direction of the high-temperature gas guide portion 50 are formed with their respective directions 52a, 52b and 52c inclined relative to the axial direction 53 of the fixed-side main conductor 20, and the axial direction 53 of the fixed-side main conductor 20 and the respective directions 52a, 52b and 52c of the high-temperature gas guide holes 51a, 51b and 51c do not intersect, that is, the twisted positional relationship (the central axis of each high-temperature gas guide hole 51a, 51b and 51c is twisted so that the flow direction of the high-temperature gas discharged from each high-temperature gas guide hole 51a, 51b and 51c is staggered), and the high-temperature gas passing through each high-temperature gas guide hole 51a, 51b and 51c forms an airflow having a swirling flow component oriented in a circumferential direction orthogonal to the axial direction.

[0068] By forming the high-temperature gas guide portion 50 with such a structure, the high-temperature gas having a swirling flow velocity is diffused in the circumferential direction, and the axial flow velocity is reduced by an amount corresponding to the increase in the swirling flow velocity. Therefore, through the effects of both, the reaching distance of the axial high-temperature gas is reduced.

[0069] In addition, by forming a plurality of high temperature gas guide holes 51a, 51b and 51c, the contact area between the low temperature gas and the high temperature gas becomes larger, and the formation of a swirling flow can promote the mixing effect with the surrounding low temperature gas, thereby improving the cooling performance of the high temperature gas.

[0070] In addition, compared with the structure having multiple blades composed of thin plates described in Patent Document 2, the high-temperature gas guide part 50 can increase the strength of the blades and the mounting part (that is, the high-temperature gas guide part 50 of this embodiment has no blades, so the structure is simple, and because a larger thickness can be obtained, the strength can be increased), and can also ensure the strength relative to the pressure when the high temperature gas in the fixed-side main conductor 20 becomes high pressure.

[0071] Through the above effects, in a case where a structure without the conventional high-temperature gas guide portion 50 is provided and an axial opening portion (an opening portion parallel to the axial direction) is provided toward the fixed-side main conductor 20, the high-temperature gas directly advances along the axial direction, and therefore a larger distance needs to be ensured to ensure insulation between the fixed-side main conductor 20 and the filling container 2.

[0072] In contrast, in the gas circuit breaker shown in the present embodiment, the temperature of the high-temperature gas discharged from the fixed-side main conductor 20 is reduced due to the effect of the high-temperature gas guide portion 50, which can shorten the axial distance of the high-temperature gas and reduce the distance for ensuring insulation between the fixed-side main conductor 20 and the filling container 2. While ensuring the insulation performance corresponding to the high-temperature gas exhaust, the overall miniaturization of the gas circuit breaker is achieved.

[0073] Example 2

[0074] Figure 5A , Figure 5B and Figure 5C A second embodiment of the gas circuit breaker of the present invention is shown. Figure 5A , Figure 5B as well as Figure 5C is equivalent to Example 1 Figure 3A , Figure 3B as well as Figure 3C .

[0075] The gas circuit breaker of the present embodiment shown in the figure is an example of a shape in which the flow path cross-sectional area of ​​the high-temperature gas guide portion 50 orthogonal to the center axis of the high-temperature gas guide holes 51a, 51b and 51c is larger than the flow path cross-sectional area of ​​the other high-temperature gas guide holes 51a, 51b and 51c at the openings at both ends of the high-temperature gas guide holes 51a, 51b and 51c (the inlet and outlet of the high-temperature gas guide holes 51a, 51b and 51c).

[0076] Specifically, if Figure 5C As shown, the hot gas guide holes 51a, 51b and 51c are not cylindrical but conical. Figure 5C The flow path cross-sectional area 54 of the hot gas guide hole 51a on the right side is larger than Figure 5C The flow path cross-sectional area 55 of the left high-temperature gas guide hole 51 a is small.

[0077] By adopting such a structure, it is of course possible to obtain the same effects as those of the first embodiment. For example, the high temperature gas distribution shape after the high temperature gas guide portion 50 can be easily adjusted by changing the hole diameters of the high temperature gas guide holes 51 a , 51 b and 51 c .

[0078] Example 3

[0079] Figure 6 A third embodiment of the gas circuit breaker of the present invention is shown.

[0080] The gas circuit breaker shown in the figure is an example in which a plurality of high-temperature gas introduction holes 51a, 51b, and 51c are implemented in a tubular shape in the gas circuit breaker described in the first embodiment.

[0081] That is, in the above-mentioned Embodiments 1 and 2, a plurality of high-temperature gas guide holes 51a, 51b and 51c are formed in the high-temperature gas guide portion 50, but in the present embodiment, the plurality of high-temperature gas guide holes 51a, 51b and 51c are formed by a tubular shape protruding from the base 50a of the high-temperature gas guide portion 50.

[0082] Specifically, if Figure 6 As shown, the high-temperature gas guide portion 50 of the present embodiment is composed of a base 50a of the high-temperature gas guide portion 50 and a plurality of (3 in the present embodiment) high-temperature gas guide holes 51a, 51b and 51c that protrude axially from the base 50a and are formed in a tubular shape. The plurality of high-temperature gas guide holes 51a, 51b and 51c formed in a tubular shape are formed so as to be inclined with respect to the axial direction 53 of the fixed-side main conductor 20 in the directions 52a, 52b and 52c respectively.

[0083] The plurality of high temperature gas guide holes 51 a , 51 b , and 51 c formed in the above-described tubular shape are provided at substantially equal intervals in the circumferential direction of the high temperature gas guide portion 50 .

[0084] In addition, in the present embodiment, it is characterized in that the directions 52a, 52b and 52c of the tubular high-temperature gas guide holes 51a, 51b and 51c formed at approximately equal intervals in the circumferential direction of the high-temperature gas guide portion 50 are inclined relative to the axial direction 53 of the fixed-side main conductor 20, and the axial direction 53 of the fixed-side main conductor 20 and the directions 52a, 52b and 52c of the tubular high-temperature gas guide holes 51a, 51b and 51c do not intersect, that is, the twisted positional relationship (the central axis of each high-temperature gas guide hole 51a, 51b and 51c is twisted so that the flow direction of the high-temperature gas discharged from each of the tubular high-temperature gas guide holes 51a, 51b and 51c is staggered), and the high-temperature gas passing through the tubular high-temperature gas guide holes 51a, 51b and 51c forms an airflow having a swirling flow component oriented in the circumferential direction orthogonal to the axial direction.

[0085] By adopting such a structure, it is of course possible to obtain the same effects as those of the first embodiment, but the thickness of the high temperature gas guide 50 can be made thinner than those of the first and second embodiments, so that the weight can be reduced.

[0086] In any of the above embodiments, the high temperature gas guide portion 50 may be manufactured by any processing method such as casting, molding based on a 3D printer, welding, etc. In addition, the high temperature gas guide holes 51a, 51b, and 51c may also have different characteristics (the diameters of the high temperature gas guide holes 51a, 51b, and 51c may be changed, or a small diameter hole may be provided in the center of the three high temperature gas guide holes 51a, 51b, and 51c as in Embodiments 1 and 2).

[0087] In addition, the central axes of the high-temperature gas guide holes 51a, 51b, and 51c are not necessarily defined by a straight line, but may be defined by an arbitrary curved line. In this case, the directions 52a, 52b, and 52c of the high-temperature gas guide holes 51a, 51b, and 51c are defined by the opening ends of the high-temperature gas guide holes 51a, 51b, and 51c on the side facing the filling container 2. In other words, the directions of the end openings of the high-temperature gas guide holes 51a, 51b, and 51c are defined.

[0088] In addition, the present invention is not limited to the above-mentioned embodiments, but includes various modified examples. For example, the above-mentioned embodiments are embodiments described in detail in order to easily explain the present invention, and are not limited to all the structures described. In addition, a part of the structure of a certain embodiment can be replaced with the structure of other embodiments, and in addition, the structure of other embodiments can be added to the structure of a certain embodiment. In addition, for a part of the structure of each embodiment, other structures can be added, deleted, or replaced.

Claims

1. A gas circuit breaker, comprising: a filling container filled with an insulating gas having arc extinguishing properties; a fixed-side main conductor connected to a fixed-side lead-out conductor connected to a power system, having an opening for discharging the insulating gas heated and pressurized by an arc generated during disconnection; a movable-side main conductor supported and fixed by an insulating support cylinder arranged inside the filling container, connected to a movable-side lead-out conductor connected to the power system, having an exhaust hole for discharging the insulating gas; A movable side contact electrically connected to the movable side lead conductor; A fixed side contact, electrically connected to a fixed side lead conductor connected to a power system, capable of contacting and separating with the movable side contact; and a high temperature gas guide portion, arranged at an axial end of the fixed side main conductor, having a plurality of holes for discharging high temperature gas generated by heating the insulating gas into the filling container, wherein the gas circuit breaker sprays the insulating gas toward the arc generated during the cut-off to extinguish the arc, characterized in that: The plurality of holes of the hot gas guide portion are formed so as to be inclined relative to the axial direction of the fixed-side main conductor. The central axes of the plurality of holes are in a twisted positional relationship, and the high-temperature gas having passed through the holes of the high-temperature gas guide portion forms an exhaust flow having a swirling component directed in a circumferential direction.

2. The gas circuit breaker according to claim 1, characterized in that: The high-temperature gas guide portion is provided integrally or separately with the fixed-side main conductor.

3. The gas circuit breaker according to claim 2, characterized in that: The plurality of holes are provided at substantially equal intervals in a circumferential direction of the hot gas guide portion.

4. The gas circuit breaker according to claim 1, characterized in that: The central axis of each of the plurality of holes is twisted so that the flow direction of the discharged high-temperature gas is shifted.

5. The gas circuit breaker according to any one of claims 1 to 4, characterized in that: The plurality of holes are respectively in a cylindrical shape.

6. The gas circuit breaker according to any one of claims 1 to 4, characterized in that: The flow path cross-sectional areas of each of the plurality of holes perpendicular to the central axis of the hole are equal at openings at both ends of the hole, or the flow path cross-sectional area of ​​any one of the holes is smaller than the flow path cross-sectional area of ​​the other hole.

7. The gas circuit breaker according to claim 6, characterized in that The plurality of holes are respectively in a cone shape.

8. A gas circuit breaker, comprising: a filling container filled with an insulating gas having arc extinguishing properties; a fixed-side main conductor connected to a fixed-side lead-out conductor connected to a power system, having an opening for discharging the insulating gas heated and pressurized by an arc generated during disconnection; a movable-side main conductor supported and fixed by an insulating support cylinder arranged inside the filling container, connected to a movable-side lead-out conductor connected to the power system, having an exhaust hole for discharging the insulating gas; A movable side contact electrically connected to the movable side lead conductor; A fixed side contact, electrically connected to a fixed side lead conductor connected to a power system, capable of contacting and separating with the movable side contact; and a high temperature gas guide portion, arranged at an axial end of the fixed side main conductor, having a plurality of holes for discharging high temperature gas generated by heating the insulating gas into the filling container, wherein the gas circuit breaker sprays the insulating gas toward the arc generated during the cut-off to extinguish the arc, characterized in that: The hot gas guide portion is composed of a base portion and a plurality of holes protruding from the base portion in the axial direction and formed in a tubular shape, and each of the plurality of holes formed in the tubular shape is formed to be inclined relative to the axial direction of the fixed-side main conductor. The central axes of the plurality of holes formed in a tubular shape are in a twisted positional relationship, and the high-temperature gas having passed through the holes of the high-temperature gas guide portion forms an exhaust flow having a swirling component directed in a circumferential direction.

9. The gas circuit breaker according to claim 8, characterized in that The plurality of holes formed in a tubular shape are provided at substantially equal intervals in a circumferential direction of the hot gas guide portion.

10. The gas circuit breaker according to claim 8, characterized in that The plurality of holes formed in a tubular shape have their central axes twisted so that the flow directions of the discharged high-temperature gas are shifted.

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