Vacuum arc extinguishing device and vacuum circuit breaker

Abstract

The invention provides a vacuum arc extinguishing device and a vacuum circuit breaker, and belongs to the technical field of switch equipment. According to the technical scheme of the vacuum arc-extinguishing device, a movable contact seat assembly is movably connected with a transmission mechanism and comprises a first end and a second end which are opposite to each other, the second end is connected with a vacuum arc-extinguishing chamber, the second end and the vacuum arc-extinguishing chamber define a movable space, the vacuum arc-extinguishing chamber is provided with a vacuum cavity, a movable contact and a static contact, and the static contact is fixed in the vacuum cavity. The moving contact is movably connected with the vacuum cavity in a sealed mode, one end of the moving contact is arranged in the vacuum cavity, the other end of the moving contact extends into the moving space and is connected with the transmission mechanism, the transmission mechanism is at least used for driving the moving contact to move in the vacuum cavity to abut against or be separated from the static contact, and the first installation space is filled with a high-pressure gas insulating medium. The air pressure of the mounting space is greater than that of the activity space. The high-voltage insulation environment is ensured, the stable movement of the moving contact in the low-voltage environment is ensured, and the reliability and the environmental protection property of the device are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of switchgear, and in particular to a vacuum arc extinguishing device and a vacuum circuit breaker. Background Art

[0002] Traditional GIS equipment mainly uses SF6 as insulation and arc extinguishing medium. SF6 has a very long atmospheric life and strong infrared ray absorption capacity, so it has a very high GWP (greenhouse effect coefficient), which is about 23,900 times that of CO2. It is one of the important factors leading to global warming. In addition to the greenhouse effect on the earth, SF6 circuit breakers produce various toxic low fluorides after decomposition through arc discharge.

[0003] Therefore, the industry currently has a solution to use CO2 as an insulating and arc-extinguishing medium. In terms of insulation, the lack of insulation performance can be compensated by increasing the gas pressure. However, while increasing the gas pressure, it also affects the breaking capacity of the switch. Because the switch is difficult to move in a high-pressure environment, especially in the electrostatic and electromagnetic breaking tests of the fast grounding switch, there is an obvious lack of breaking capacity, which poses a hidden danger to the use of GIS equipment. Summary of the invention

[0004] Aiming at the problem that when the insulation performance is enhanced by increasing the gas pressure in the existing equipment, the breaking capacity is insufficient due to the high gas pressure, the present invention proposes a vacuum arc extinguishing device and a vacuum circuit breaker.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] The present invention provides a vacuum arc extinguishing device, including an outer shell, wherein the outer shell is provided with a first installation space, the first installation space is provided with a vacuum arc extinguishing mechanism, the vacuum arc extinguishing mechanism includes a moving contact seat assembly and a vacuum arc extinguishing chamber, the moving contact seat assembly is movably connected with a transmission mechanism, the moving contact seat assembly includes a first end and a second end opposite to each other, the first end is connected to the outer shell, the second end is connected to the vacuum arc extinguishing chamber, and the second end and the vacuum arc extinguishing chamber form an active space, the vacuum arc extinguishing chamber is provided with a vacuum chamber, a moving contact and a static contact, the static contact is fixed in the vacuum chamber, the moving contact is movably and hermetically connected to the vacuum chamber, one end of the moving contact is arranged in the vacuum chamber, the other end of the moving contact extends into the active space and is connected to the transmission mechanism, the transmission mechanism is at least used for driving the moving contact to move in the vacuum chamber to abut or separate from the static contact, the first installation space is filled with a gas insulating medium, and the air pressure of the installation space is greater than the air pressure of the active space.

[0007] Furthermore, the device includes an upper shell, which is sealed and connected to the outer shell. The upper shell is provided with a second installation space. The transmission mechanism is at least partially provided in the second installation space. The second installation space is connected to the activity space. The air pressure in the first installation space is greater than the air pressure in the second installation space.

[0008] Furthermore, the moving contact seat assembly includes a moving contact seat body and a guide cylinder, the moving contact seat body is provided with a first chamber and a second chamber which are connected in sequence along the moving direction of the moving contact, the transmission mechanism is connected to the first chamber, the first chamber is connected to the second installation space, one end of the guide cylinder is sealed and connected to the vacuum arc extinguishing chamber, the other end of the guide cylinder is movably and sealably connected to the second chamber, and the guide cylinder and the second chamber enclose a movable space, and the guide cylinder is provided with a first opening for the moving contact to pass through.

[0009] Furthermore, a first sealing ring body is provided between the outer wall of the guide cylinder and the inner wall of the second chamber.

[0010] Furthermore, the first sealing ring body includes a plurality of O-rings.

[0011] Furthermore, a guide ring body is provided between the outer wall of the guide cylinder and the inner wall of the second chamber.

[0012] Furthermore, a sealing flange is provided between the guide cylinder and the vacuum interrupter, the sealing flange is provided with a second opening for the moving contact to pass through, and a second sealing ring body is provided between the sealing flange and the vacuum interrupter.

[0013] Furthermore, the moving contact seat assembly includes an elastic member and a joint member, the first chamber includes a first mounting groove and a accommodating groove which are connected in sequence, the accommodating groove is connected to the second chamber, the first mounting groove is connected to a guide seat, the guide seat is provided with a second mounting groove, the accommodating groove is movably connected to the first mounting seat, the first mounting seat is provided with a third mounting groove, one end of the first mounting seat is connected to the guide seat, the second mounting groove and the third mounting groove are connected, the elastic member is fixed in the third mounting groove, the joint member is movably arranged in the third mounting groove, the joint member includes a first fixing portion, a limiting portion and a second fixing portion which are connected in sequence, the second fixing portion is connected to the moving contact, the first fixing portion extends into the second mounting groove and is connected to a transmission mechanism, when the transmission mechanism drives the joint member to move and drives the moving contact to abut against the static contact, the limiting portion abuts against the elastic member and drives the elastic member to elastically contract.

[0014] Furthermore, the elastic member is a disc spring.

[0015] Furthermore, a bearing is provided between the inner wall of the second mounting groove and the first mounting seat.

[0016] Furthermore, a watch strap contact finger is provided between the outer wall of the first mounting seat and the inner wall of the accommodating groove.

[0017] Furthermore, a guide belt body is provided between the outer wall of the first mounting seat and the inner wall of the accommodating groove.

[0018] Furthermore, the transmission mechanism includes an insulating pull rod and a direct-acting member. The direct-acting member is arranged in the second installation space. The direct-acting member can rotate around a set axis. One end of the insulating pull rod is connected to the connecting member, and the other end of the insulating pull rod is connected to the direct-acting member. The direct-acting member is at least used to convert its own rotational motion into linear motion and drive the insulating pull rod to move.

[0019] Furthermore, two opposite ends of the vacuum chamber are connected with shielding covers.

[0020] Furthermore, the shielding cover is a plastic-sprayed structure.

[0021] Furthermore, the vacuum arc extinguishing mechanism also includes a static contact seat assembly, which includes a static contact seat body, a static side insulating platform and a static side support seat body connected in sequence, the static contact seat body is connected to one end of the vacuum arc extinguishing chamber away from the moving contact seat assembly, and one end of the static side support seat body is connected to the outer shell.

[0022] Furthermore, the moving contact seat assembly includes a moving side insulating platform, one end of which is connected to the outer shell to form a first end.

[0023] Furthermore, at least three vacuum arc extinguishing mechanisms are provided in the first installation space, and the three vacuum arc extinguishing mechanisms are connected by a cross arm, and the cross arm is connected to the transmission mechanism.

[0024] Furthermore, the cross arm includes a central portion and a first cross beam, a second cross beam and a third cross beam distributed circumferentially along the central portion, the first cross beam, the second cross beam and the third cross beam are all connected to a vacuum arc extinguishing mechanism, and the central portion is connected to a transmission mechanism.

[0025] Furthermore, a first axis pin hole is provided at one end of the first beam away from the center, a second axis pin hole is provided at one end of the second beam away from the center, and a third axis pin hole is provided at one end of the third beam away from the center, and the cross arm is connected to the vacuum arc chamber through an axis pin.

[0026] Furthermore, a line connecting the center points of the first axis pin hole, the second axis pin hole and the third axis pin hole forms an isosceles triangle structure.

[0027] The present invention also provides a vacuum circuit breaker, comprising any one of the above-mentioned vacuum arc extinguishing devices.

[0028] It can be seen from the above technical solutions that the advantages of the present invention are:

[0029] The present invention connects the moving contact seat assembly with the vacuum arc extinguishing chamber to form an activity space for the transmission mechanism to drive the moving contact to move, so that the outer shell is divided into a double air chamber structure, one air chamber is a first installation space for high pressure, and the vacuum arc extinguishing chamber is placed inside, which can further improve the insulation effect, and the other air chamber is a low-pressure activity space, which can make it more convenient for the transmission mechanism to drive the moving contact to move, so as to more stably realize the conversion between the open state and the closed state. The interior of the outer shell is set to a double air chamber structure separated by high pressure and low pressure. While ensuring the environment of high-voltage insulation, it can also ensure the stable movement of the moving contact in a low-pressure environment, further improving the reliability and environmental protection of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the description will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0031] Figure 1 It is a schematic diagram of a partial cross-sectional structure of the device in a closed state in one embodiment of the present invention;

[0032] Figure 2 yes Figure 1 A schematic diagram of a partial cross-sectional structure of the device in the embodiment shown in the open state;

[0033] Figure 3 It is a cross-sectional view of the installation structure of the moving contact seat assembly and the vacuum interrupter in one embodiment of the present invention;

[0034] Figure 4 is a schematic diagram of a partial cross-sectional structure of a moving contact seat assembly in an embodiment of the present invention;

[0035] Figure 5 It is a partial cross-sectional view of a connection structure of multiple vacuum arc extinguishing mechanisms in one embodiment of the present invention;

[0036] Figure 6 It is a top view of a cross arm in one embodiment of the present invention.

[0037] Description of main reference numerals:

[0038] 100, outer shell; 110, first installation space; 200, dynamic contact seat assembly; 210, dynamic contact seat body; 211, first chamber; 2111, first installation groove; 2112, receiving groove; 212, second chamber; 220, guide cylinder; 221, first sealing ring body; 222, guide ring body; 230, sealing flange; 231, second sealing ring body; 240, joint member; 241, first fixing part; 242, limiting part; 243, second fixing part; 250, elastic member; 260, guide seat; 261, second installation groove; 270, first installation seat; 271, third installation groove; 272, bearing; 273, strap contact finger; 274, guide belt body; 28 0, moving side insulation platform; 300, vacuum arc extinguishing chamber; 310, vacuum chamber; 320, moving contact; 330, static contact; 340, shielding cover; 400, transmission mechanism; 410, insulating pull rod; 420, direct-acting member; 421, rotating section; 422, direct-acting section; 500, activity space; 600, upper shell; 610, second installation space; 700, static contact seat assembly; 710, static contact seat body; 720, static side insulation platform; 730, static side support seat body; 800, cross arm; 810, center part; 820, first cross beam; 821, first axis pin hole; 830, second cross beam; 831, second axis pin hole; 840, third cross beam; 841, third axis pin hole. DETAILED DESCRIPTION

[0039] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in this specific embodiment. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this patent.

[0040] Example 1

[0041] See also Figure 1-Figure 4A vacuum arc extinguishing device includes a vacuum arc extinguishing device, including an outer shell 100, the outer shell 100 is provided with a first installation space 110, the first installation space 110 is provided with a vacuum arc extinguishing mechanism, the vacuum arc extinguishing mechanism includes a moving contact seat assembly 200 and a vacuum arc extinguishing chamber 300, the moving contact seat assembly 200 is movably connected with a transmission mechanism 400, the moving contact seat assembly 200 includes a first end and a second end opposite to each other, the first end is connected to the outer shell 100, the second end is connected to the vacuum arc extinguishing chamber 300, and the second end and the vacuum arc extinguishing chamber 300 enclose an active space 500, the vacuum arc extinguishing chamber 300 A vacuum chamber 310, a moving contact 320 and a stationary contact 330 are provided. The stationary contact 330 is fixed in the vacuum chamber 310. The moving contact 320 is movably and hermetically connected to the vacuum chamber 310. One end of the moving contact 320 is provided in the vacuum chamber 310, and the other end of the moving contact 320 extends into the active space 500 and is connected to the transmission mechanism 400. The transmission mechanism 400 is at least used to drive the moving contact 320 to move in the vacuum chamber 310 to abut against or separate from the stationary contact 330. The first installation space 110 is filled with a gas insulating medium, and the air pressure of the installation space is greater than the air pressure of the active space 500.

[0042] In this embodiment, if Figure 1 , 2As shown, the outer shell 100 is a hollow shell structure, and the inner hollow part forms a first installation space 110, and a vacuum arc extinguishing mechanism is installed and connected in the first installation space 110, and a high-voltage gas insulating medium is filled in the first installation space 110, wherein the vacuum arc extinguishing mechanism includes a moving contact seat assembly 200 and a vacuum arc extinguishing chamber 300. Taking the installation of the device in the vertical direction as an example, the outer shell 100 is arranged in the vertical direction, and the moving contact seat assembly 200 is arranged on the upper side of the vacuum arc extinguishing chamber 300, one end of the upper side of the moving contact seat assembly 200 is the first end, and one end of the lower side of the moving contact seat is the second end, the first end is connected to the upper end wall of the outer shell 100, the second end is connected to the upper end of the vacuum arc extinguishing chamber 300, and the first end is connected to the upper end of the vacuum arc extinguishing chamber 300, and the second end is connected to the upper end of the vacuum arc extinguishing chamber 300. The two ends are connected to the vacuum arc extinguishing chamber 300 to form an active space 500, which is a low-pressure environment. The vacuum arc extinguishing chamber 300 includes a vacuum chamber 310. The vacuum chamber 310 is a cylindrical structure with its axial direction in the vertical direction. A static contact 330 is fixed at the bottom of the vacuum chamber 310, and a moving contact 320 is movably sealed at the top of the vacuum chamber 310. The top of the moving contact 320 extends from the vacuum chamber 310 to the active space 500 and is connected to the transmission mechanism 400. The transmission mechanism 400 can drive the moving contact 320 to move in the vacuum chamber 310 along the vertical direction, so that the bottom end of the moving contact 320 abuts against or separates from the top end of the static contact 330, thereby realizing the closing or opening state. When switching from the open state to the closed state, the transmission mechanism 400 drives the moving contact 320 to move downward in the vertical direction, so that the moving contact 320 abuts against the static contact 330, and the vacuum chamber 310 is a vacuum environment. The arc generated by the contact between the moving contact 320 and the static contact 330 is extinguished in the vacuum environment. When switching from the closed state to the open state, the transmission mechanism 400 drives the moving contact 320 to move upward in the vertical direction, so that the moving contact 320 and the static contact 330 are separated. Similarly, the arc generated by the separation of the moving contact 320 and the static contact 330 is extinguished in the vacuum environment in the vacuum chamber 310.

[0043] Among them, the first installation space 110 is filled with a high-voltage gas insulating medium, so that the first installation space 110 is insulated by high voltage, which can effectively isolate the conductive parts and prevent current leakage and arc generation. In addition, in this embodiment, the high-voltage gas insulating medium can be clean air, which can further improve environmental protection and effectively avoid the release of harmful gases. At this time, the activity space 500 surrounded by the second end and the vacuum interrupter 300 is a low-pressure environment, so that the transmission mechanism 400 and part of the moving contact 320 are present in the low-pressure environment, so that the transmission mechanism 400 drives the moving contact 320 to move conveniently.

[0044] In the above structure, the moving contact seat assembly is connected with the vacuum arc extinguishing chamber 300 to form an active space 500 for the transmission mechanism 400 to drive the moving contact 320 to move, so that the outer shell 100 is divided into a double air chamber structure, one air chamber is a high-pressure first installation space 110, and the vacuum arc extinguishing chamber 300 is placed inside, which can further improve the insulation effect, and the other air chamber is a low-pressure active space 500, which can make it more convenient for the transmission mechanism 400 to drive the moving contact 320 to move, so as to more stably realize the conversion between the open state and the closed state. The interior of the outer shell 100 is set to a double air chamber structure separated by high pressure and low pressure. While ensuring the environment of high-voltage insulation, it can also ensure the stable movement of the moving contact 320 in a low-pressure environment, further improving the reliability and environmental protection of the device.

[0045] In addition, if Figure 1 , 2 As shown, the device includes an upper shell 600, which is sealed and connected to the outer shell 100. The upper shell 600 is provided with a second installation space 610. The transmission mechanism 400 is at least partially arranged in the second installation space 610. The second installation space 610 is connected to the activity space 500, and the air pressure in the first installation space 110 is greater than the air pressure in the second installation space 610.

[0046] In this embodiment, an upper shell 600 is also connected to the upper end side of the outer shell 100, and the upper shell 600 is a hollow frame structure with an opening facing downward. The opening edge of the lower end of the upper shell 600 is sealed and connected to the upper end side of the outer shell 100, and the hollow part inside the upper shell 600 forms a second installation space 610, wherein a transmission mechanism 400 is installed in the second installation space 610, wherein the transmission mechanism 400 extends into the moving contact seat assembly 200 and is connected to the moving contact 320, so that the second installation space 610 is connected to the active space 500, and the air pressure of the second installation space 610 is consistent with the air pressure in the active space 500, and the second installation space 610 is separated from the first installation space 110, so that the stability of their respective air pressures can be effectively guaranteed. By arranging the upper shell 600 on the outer shell 100, the second installation space 610 of the upper shell 600 is connected to the activity space 500, thereby ensuring the stability of the low-pressure environment of the activity space 500. The transmission mechanism 400 is located in the low-pressure environment, thereby improving the stability of the movement of the moving contact 320.

[0047] Specifically, in the connection between the upper shell 600 and the outer shell 100, a sealing strip is set along the lower opening edge of the upper shell 600. The sealing strip is set to achieve a sealed connection between the upper shell 600 and the outer shell 100, and also to prevent the second installation space 610 from being connected to the outside, thereby affecting the air pressure stability of the activity space 500.

[0048] In the specific structure of the moving contact seat assembly 200, as shown in FIG. Figure 3 , 4 As shown, the moving contact seat assembly 200 includes a moving contact seat body and a guide cylinder 220. The moving contact seat body is provided with a first chamber 211 and a second chamber 212 that are connected in sequence along the moving direction of the moving contact 320. The transmission mechanism 400 is connected to the first chamber 211. The first chamber 211 is connected to the second installation space 610. One end of the guide cylinder 220 is sealed and connected to the vacuum interrupter 300. The other end of the guide cylinder 220 is movably sealed and connected to the second chamber 212. The guide cylinder 220 and the second chamber 212 enclose an active space 500. The guide cylinder 220 is provided with a first opening for the moving contact 320 to pass through. A first sealing ring body 221 is provided between the outer wall of the guide cylinder 220 and the inner wall of the second chamber 212. The first sealing ring body 221 includes a plurality of O-rings. A guide ring body 222 is provided between the outer wall of the guide cylinder 220 and the inner wall of the second chamber 212. A sealing flange 230 is provided between the guide cylinder 220 and the vacuum interrupter 300 . The sealing flange 230 is provided with a second opening for the moving contact 320 to pass through. A second sealing ring body 231 is provided between the sealing flange 230 and the vacuum interrupter 300 .

[0049] In this embodiment, the moving contact seat includes a moving contact seat body relatively located on the upper side and a guide cylinder 220 relatively located on the lower side. A first chamber 211 and a second chamber 212 extending in the vertical direction are provided in the middle of the moving contact seat, wherein the first chamber 211 is relatively located on the upper side of the second chamber 212, and the first chamber 211 and the second chamber 212 are communicated. The lower end of the guide cylinder 220 is sealed and connected to the upper end of the vacuum arc chamber 300, and the upper end of the guide cylinder 220 extends into the second chamber 212 and is movably and sealedly connected to the moving contact seat body 210, so that the part of the second chamber 212 surrounded by the guide cylinder 220 and the moving contact seat body 210 forms an active space 500, and one end of the moving contact 320 extends into the active space 500 through the first opening on the guide cylinder 220 and is connected to the transmission mechanism 400. The movable contact seat body 210 and the guide cylinder 220 are connected and enclosed to form an activity space 500 , which is convenient for installation and disassembly, and the guide cylinder 220 also provides a guiding function for the movable contact 320 .

[0050] In the structure in which the guide cylinder 220 is movably sealed to the movable contact seat body 210, a first sealing ring body 221 is provided along the circumference of the outer wall of the guide cylinder 220. When the guide cylinder 220 is connected to the movable contact seat body 210, the first sealing ring body 221 is formed between the outer wall of the guide cylinder 220 and the inner wall of the second chamber 212, thereby effectively preventing gas from leaking between the inner wall of the guide cylinder 220 and the second chamber 212, thereby ensuring the sealing effect. In addition, the first sealing ring body 221 is a plurality of sealing ring bodies 221 arranged along the vertical direction. O-rings are evenly spaced apart to provide multiple seals, and a guide ring body 222 is provided on the outer wall of the guide cylinder 220 on the upper side of the first sealing ring. When the device is switched between the open state and the closed state, the transmission mechanism 400 drives the moving contact 320 to move, and the guide cylinder 220 and the moving contact seat also move relative to each other due to the force. The guide ring body 222 is provided between the guide cylinder 220 and the outer wall and the inner wall of the second chamber 212 to support and guide the guide cylinder 220.

[0051] Furthermore, in the sealed connection structure between the guide cylinder 220 and the vacuum arc chamber 300, a sealing flange 230 is arranged between the guide cylinder 220 and the vacuum arc chamber 300, and a second opening for the moving contact 320 to pass through is opened in the middle of the sealing flange 230, wherein the second opening is movably sealed with the moving contact 320, and the upper end face of the sealing flange 230 closes the first opening of the guide cylinder 220, and the lower end face of the sealing flange 230 is tightly attached to the vacuum arc chamber 300, wherein a second sealing ring body 231 is arranged between the lower end face of the sealing flange 230 and the vacuum arc chamber 300, thereby further improving the sealing between the sealing flange 230 and the vacuum arc chamber 300.

[0052] In addition, the movable contact seat assembly 200 includes an elastic member 250 and a connector member 240, the first chamber 211 includes a first mounting groove 2111 and a receiving groove 2112 which are connected in sequence, the receiving groove 2112 is connected to the second chamber 212, the first mounting groove 2111 is connected to the guide seat 260, the guide seat 260 is provided with a second mounting groove 261, the receiving groove 2112 is movably connected to the first mounting seat 270, the first mounting seat 270 is provided with a third mounting groove 271, one end of the first mounting seat 270 is connected to the guide seat 260, the second mounting groove 261 and the third mounting groove 271 are connected The elastic member 250 is fixed in the third mounting groove 271, and the connector 240 is movably arranged in the third mounting groove 271. The connector 240 includes a first fixing portion 241, a limiting portion 242 and a second fixing portion 243 connected in sequence. The second fixing portion 243 is connected to the moving contact 320. The first fixing portion 241 extends into the second mounting groove 261 and is connected to the transmission mechanism 400. When the transmission mechanism 400 drives the connector 240 to move and drives the moving contact 320 to abut against the static contact 330, the limiting portion 242 abuts against the elastic member 250 and drives the elastic member 250 to elastically contract. The elastic member 250 is a disc spring. A bearing 272 is arranged between the inner wall of the second mounting groove 261 and the first mounting seat 270. A watch band contact finger 273 is arranged between the outer wall of the first mounting seat 270 and the inner wall of the accommodating groove 2112. A guide belt 274 is disposed between the outer wall of the first mounting seat 270 and the inner wall of the receiving groove 2112 .

[0053] In this embodiment, the first chamber 211 is divided into a first mounting groove 2111 and a receiving groove 2112 which are connected in sequence along the vertical direction, wherein the first mounting groove 2111, the receiving groove 2112 and the second chamber 212 are connected, the receiving groove 2112 can be a circular through groove structure, a guide seat 260 is installed in the first mounting groove 2111, wherein the middle part of the guide seat 260 is provided with a second mounting groove 261 extending in the vertical direction, the transmission mechanism 400 can pass through the second mounting groove 261 to connect with the moving contact 320, in addition, a first mounting seat 270 is movably connected in the receiving groove 2112, and the middle part of the first mounting seat 270 is also provided with a third mounting groove 271 extending in the vertical direction, wherein the first mounting seat 270 is ...60 is provided with a third mounting groove 271 extending in the vertical direction, wherein the first mounting seat 260 is provided with a third mounting groove 271 extending in the vertical direction, wherein the first mounting seat 260 is provided with a third mounting groove 271 extending in the vertical direction, wherein the first mounting seat 260 is provided with a third mounting groove 271 extending in the vertical direction, wherein the first mounting seat 260 is provided with a third mounting groove 261 extending in the vertical direction, wherein the The top end of the seat 270 extends into the second mounting groove 261 and is connected to the bottom end of the guide seat 260, so that the third mounting groove 271 is connected to the second mounting groove 261, and the connector 240 is installed in the third mounting groove 271. The second fixing portion 243 of the connector 240 extends into the active space 500 and is connected to the top end of the moving contact 320. The second fixing portion 243 of the connector 240 extends into the second mounting groove 261 and is connected to the transmission mechanism 400. In addition, in the third mounting groove 271, an elastic member 250 is provided on the outer periphery of the connector 240, wherein the limiting portion 242 of the connector 240 is located on the upper side of the elastic member 250, and the diameter of the limiting portion 242 is greater than the inner diameter of the elastic member 250. When switching from the open state to the closed state, the transmission mechanism 400 drives the connector 240 to move downward in the vertical direction, thereby driving the moving contact 320 to move downward, wherein the limit portion 242 of the connector 240 abuts against the elastic member 250 and drives the elastic member 250 to elastically contract downward, and when the moving contact 320 contacts the static contact 330, the moving contact 320 continues to move downward, so that the moving contact 320 and the static contact 330 are pressed against each other. The elastic member 250 is provided to provide the initial pressure of the moving contact 320, thereby ensuring the reliable contact between the moving contact 320 and the static contact 330. When switching from the closed state to the open state, the transmission mechanism 400 drives the connector 240 to move upward, and the elastic member 250 loses the load and is converted to an elastically stretched state, thereby assisting the connector 240 to drive the moving contact 320 to move upward, so that the open state can be quickly realized. In particular, the elastic frame can be a disc spring, which has the characteristics of short stroke and heavy load.

[0054] In addition, a bearing 272 is provided between the first mounting seat 270 and the inner wall of the second mounting groove 261, so as to reduce the friction between the inner walls of the first mounting seat 270 and the second mounting groove 261 and improve the service life. A strap contact finger 273 is provided between the outer wall of the first mounting seat 270 and the inner wall of the receiving groove 2112, and the strap contact finger 273 is used to conduct electricity in the open state and the closed state. In addition, a guide belt body 274 is provided between the outer wall of the first mounting seat 270 and the inner wall of the receiving groove 2112 to provide support and guidance for the first mounting seat 270.

[0055] In the specific structure of the transmission mechanism 400, as shown in FIG. Figure 1 , 2 As shown, the transmission mechanism 400 includes an insulating rod 410 and a direct-acting member 420. The direct-acting member 420 is arranged in the second installation space 610. The direct-acting member 420 can rotate around a set axis. One end of the insulating rod 410 is connected to the connector 240, and the other end of the insulating rod 410 is connected to the direct-acting member 420. The direct-acting member 420 is at least used to convert its own rotational motion into linear motion and drive the insulating rod 410 to move.

[0056] In this embodiment, the transmission mechanism 400 includes an insulating rod 410 and a direct-acting member 420, wherein the direct-acting member 420 is connected to the top end of the insulating rod 410, and the bottom end of the insulating rod 410 is connected to the connector 240, wherein the direct-acting member 420 is arranged in the second installation space 610 of the upper shell 600, and the insulating rod 410 enters from the second installation space 610 into the second installation groove 261 and is connected to the connector 240, specifically, the direct-acting member 420 includes a rotating section 421 and a direct-acting section 422, wherein the rotating section 421 includes a rotating portion and a connecting portion, the rotating section 421 is hinged in the upper shell 600, the connecting portion is connected to one end of the direct-acting section 422, and the other end of the direct-acting section 422 is connected to the insulating rod 410, and the rotating portion is rotated by an external force so that the rotating section 421 rotates, thereby causing the connecting portion to drive the direct-acting section to move in a vertical direction.

[0057] In particular, such as Figure 3 As shown, the two opposite ends of the vacuum chamber 310 are connected with shielding cover bodies 340. The shielding cover body 340 is a spray-molded structure. In this embodiment, shielding cover bodies 340 are provided at the upper and lower ends of the vacuum chamber 310, wherein the shielding cover body 340 is an arc-shaped cover body, the opening of the shielding cover body 340 at the upper end of the vacuum chamber 310 faces downward, and the opening of the shielding cover body 340 at the lower end of the vacuum chamber 310 faces upward, which effectively shields the electric field of the vacuum chamber 310. The shielding cover body 340 is a spray-molded structure, which is simple in structure and easy to implement.

[0058] In addition, if Figure 1As shown, the vacuum arc extinguishing mechanism further includes a stationary contact seat assembly 700, which includes a stationary contact seat body 710, a stationary side insulating platform 720 and a stationary side supporting seat body 730 connected in sequence, the stationary contact seat body 710 is connected to one end of the vacuum arc extinguishing chamber 300 away from the moving contact seat assembly 200, and one end of the stationary side supporting seat body 730 is connected to the outer shell 100. The moving contact seat assembly 200 includes a moving side insulating platform 280, one end of which is connected to the outer shell 100 to form a first end.

[0059] In this embodiment, the vacuum arc extinguishing mechanism further includes a static contact seat assembly 700, which is connected with a static contact seat body 710, a static side insulating platform 720 and a static side support seat body 730 in sequence from top to bottom in the vertical direction, wherein the bottom of the static side support seat body 730 is fixedly connected to the outer shell 100, and the static side insulating platform 720 is connected to the upper end of the static side support seat, the upper end of the static side insulating platform 720 is connected to the static contact seat body 710, and the upper end of the static contact seat body 710 is fixedly connected to the vacuum chamber 310. The static contact seat body 710 is used to support the upper structure of the vacuum chamber 310, and the static side insulating platform 720 plays the role of insulation and support for the static contact seat body 710, wherein the static side insulating platform 720 is an epoxy resin structure, and the static side support seat body 730 is installed at the bottom of the outer shell 100 to support the upper structure.

[0060] In addition, the moving contact seat assembly 200 also includes a moving side insulating platform 280, wherein the bottom end of the moving side insulating platform 280 is connected to the upper end of the moving contact seat body 210, the upper end of the moving side insulating platform 280 is connected to the top of the outer shell 100, and the moving side insulating platform 280 is provided with a through hole for the insulating pull rod 410 to pass through, and the moving side insulating platform 280 is connected between the moving contact seat body 210 and the outer shell 100 to play the role of insulation and support.

[0061] Example 2

[0062] See also Figure 5-Figure 6A vacuum arc extinguishing device, in this embodiment 2, other structures are basically the same as those in embodiment 1, and the inconsistent structures are as follows: at least three vacuum arc extinguishing mechanisms are arranged in the first installation space 110, and the three vacuum arc extinguishing mechanisms are connected by a cross arm 800, and the cross arm 800 is connected to the transmission mechanism 400. The cross arm 800 includes a central portion 810 and a first cross beam 820, a second cross beam 830 and a third cross beam 840 distributed along the circumference of the central portion 810, and the first cross beam 820, the second cross beam 830 and the third cross beam 840 are all connected with the vacuum arc extinguishing mechanism, and the central portion 810 is connected to the transmission mechanism 400. The first cross beam 820 is provided with a first shaft pin hole 821 at one end away from the central portion 810, the second cross beam 830 is provided with a second shaft pin hole 831 at one end away from the central portion 810, and the third cross beam 840 is provided with a third shaft pin hole 841 at one end away from the central portion 810, and the cross arm 800 is connected to the vacuum arc extinguishing chamber 300 through a shaft pin. The line connecting the center points of the first axis pin hole 821 , the second axis pin hole 831 and the third axis pin hole 841 forms an isosceles triangle structure.

[0063] In this embodiment, if Figure 5 , 6 As shown, three vacuum arc extinguishing mechanisms are provided inside the outer shell 100 to realize a three-phase arc extinguishing chamber, wherein the three vacuum arc extinguishing mechanisms are interconnected through a cross arm 800. Specifically, the three vacuum arc extinguishing mechanisms are respectively connected to an insulating pull rod 410, and the three insulating pull rods 410 are all connected to the cross arm 800. The cross arm 800 is connected to the direct-acting member 420, and the three vacuum arc extinguishing mechanisms are jointly driven by the direct-acting member 420 to perform closing and opening movements. In the specific structure of the cross arm 800, the cross arm 800 includes a central portion 810 and a first cross beam 820, a second cross beam 830 and a third cross beam 840 arranged along the circumference of the central portion 810. The first cross beam 820, the second cross beam 830 and the third cross beam 840 all extend radially along the central portion 810. The first cross beam 820, the second cross beam 830 and the third cross beam 840 are all connected to an insulating pull rod 410. Each insulating pull rod 410 is connected to a vacuum arc extinguishing mechanism, and one end of the direct-acting member 420 is connected to the central portion 810. By driving the central portion 810 to move, the three vacuum arc extinguishing mechanisms are driven to move. A first axle pin hole 821 is provided at the outer end of the first crossbeam 820, and one end of the insulating pull rod 410 is fixedly connected by passing an axle pin through the first axle pin hole 821. This connection method is simple and convenient. Similarly, a second axle pin hole 831 is provided at the outer end of the second crossbeam 830, and a third axle pin hole 841 is provided at the outer end of the third crossbeam 840, and fixed by an axle pin. In addition, the midpoint line of the first axle pin hole 821, the second axle pin hole 831 and the third axle pin hole is an isosceles triangle structure, which can make the force uniform and further improve the synchronization of the three-phase vacuum arc extinguishing mechanism.

[0064] Example 3

[0065] The invention also provides a vacuum circuit breaker, comprising a vacuum arc extinguishing device.

[0066] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A vacuum arc extinguishing device, comprising an outer shell, wherein the outer shell is provided with a first installation space, wherein the first installation space is provided with a vacuum arc extinguishing mechanism, wherein the vacuum arc extinguishing mechanism comprises a moving contact seat assembly and a vacuum arc extinguishing chamber, wherein: The moving contact seat assembly is movably connected with a transmission mechanism, and the moving contact seat assembly includes a first end and a second end relative to each other, the first end is connected to the outer shell, the second end is connected to the vacuum arc chamber, and the second end and the vacuum arc chamber form an active space, the vacuum arc chamber is provided with a vacuum chamber, a moving contact and a static contact, the static contact is fixed in the vacuum chamber, the moving contact is movably and hermetically connected to the vacuum chamber, one end of the moving contact is arranged in the vacuum chamber, the other end of the moving contact extends into the active space and is connected to the transmission mechanism, the transmission mechanism is at least used to drive the moving contact to move in the vacuum chamber to abut or separate from the static contact, the first installation space is filled with a gas insulating medium, and the air pressure of the installation space is greater than the air pressure of the active space.

2. A vacuum arc extinguishing device according to claim 1, characterized in that: It includes an upper shell, which is sealed and connected to the outer shell. The upper shell is provided with a second installation space. The transmission mechanism is at least partially arranged in the second installation space. The second installation space is connected to the activity space. The air pressure in the first installation space is greater than the air pressure in the second installation space.

3. A vacuum arc extinguishing device according to claim 2, characterized in that: The movable contact seat assembly comprises a movable contact seat body and a guide cylinder, wherein the movable contact seat body is provided with a first chamber and a second chamber which are connected in sequence along the moving direction of the movable contact, the transmission mechanism is connected to the first chamber, the first chamber is connected to the second installation space, one end of the guide cylinder is sealed and connected to the vacuum arc extinguishing chamber, the other end of the guide cylinder is movably and sealably connected to the second chamber, and the guide cylinder and the second chamber enclose the movable space, and the guide cylinder is provided with a first opening for the movable contact to pass through; And / or, a first sealing ring body is provided between the outer side wall of the guide cylinder and the inner side wall of the second chamber; And / or, the first sealing ring body includes a plurality of O-rings; And / or, a guide ring body is provided between the outer wall of the guide cylinder and the inner wall of the second chamber.

4. A vacuum arc extinguishing device according to claim 3, characterized in that: A sealing flange is provided between the guide cylinder and the vacuum interrupter, the sealing flange is provided with a second opening for the moving contact to pass through, and a second sealing ring body is provided between the sealing flange and the vacuum interrupter.

5. A vacuum arc extinguishing device according to claim 3, characterized in that: The movable contact seat assembly comprises an elastic member and a joint member, the first chamber comprises a first mounting groove and a receiving groove which are connected in sequence, the receiving groove is connected with the second chamber, a guide seat is connected in the first mounting groove, the guide seat is provided with a second mounting groove, the first mounting seat is movably connected in the receiving groove, the first mounting seat is provided with a third mounting groove, one end of the first mounting seat is connected with the guide seat, the second mounting groove is connected with the third mounting groove, the elastic member is fixed in the third mounting groove, the joint member is movably arranged in the third mounting groove, the joint member comprises a first fixing portion, a limiting portion and a second fixing portion which are connected in sequence, the second fixing portion is connected with the movable contact, the first fixing portion extends into the second mounting groove and is connected with the transmission mechanism, when the transmission mechanism drives the joint member to move and drives the movable contact to abut against the static contact, the limiting portion abuts against the elastic member and drives the elastic member to elastically contract; And / or, the elastic member is a disc spring; And / or, a bearing is provided between the inner wall of the second mounting groove and the first mounting seat; And / or, a watch strap contact finger is provided between the outer side wall of the first mounting seat and the inner wall of the receiving groove; And / or, a guide belt body is provided between the outer side wall of the first mounting seat and the inner wall of the accommodating groove; And / or, the transmission mechanism includes an insulating pull rod and a direct-acting member, the direct-acting member is arranged in the second installation space, the direct-acting member can rotate around a set axis, one end of the insulating pull rod is connected to the connecting member, and the other end of the insulating pull rod is connected to the direct-acting member, and the direct-acting member is at least used to convert its own rotational motion into linear motion and drive the insulating pull rod to move.

6. A vacuum arc extinguishing device according to claim 1, characterized in that: The opposite ends of the vacuum chamber are connected with shielding covers; And / or, the shielding cover body is a plastic-sprayed structure.

7. A vacuum arc extinguishing device according to claim 1, characterized in that: The vacuum arc extinguishing mechanism also includes a static contact seat assembly, which includes a static contact seat body, a static side insulating platform and a static side supporting seat body connected in sequence, the static contact seat body is connected to one end of the vacuum arc extinguishing chamber away from the moving contact seat assembly, and one end of the static side supporting seat body is connected to the outer shell; And / or, the movable contact seat assembly includes a movable side insulating platform, and one end of the movable side insulating platform is connected to the outer shell to form the first end.

8. A vacuum arc extinguishing device according to any one of claims 1 to 7, characterized in that: At least three vacuum arc extinguishing mechanisms are arranged in the first installation space, and the three vacuum arc extinguishing mechanisms are connected by a cross arm, and the cross arm is connected to the transmission mechanism.

9. A vacuum arc extinguishing device according to claim 8, characterized in that: The cross arm comprises a central portion and a first cross beam, a second cross beam and a third cross beam uniformly distributed along the circumference of the central portion, the first cross beam, the second cross beam and the third cross beam are all connected to the vacuum arc extinguishing mechanism, and the central portion is connected to the transmission mechanism; And / or, a first axis pin hole is provided at one end of the first crossbeam away from the central portion, a second axis pin hole is provided at one end of the second crossbeam away from the central portion, a third axis pin hole is provided at one end of the third crossbeam away from the central portion, and the cross arm is connected to the vacuum interrupter through an axis pin; And / or, a line connecting the center points of the first axis pin hole, the second axis pin hole and the third axis pin hole forms an isosceles triangle structure.

10. A vacuum circuit breaker, characterized in that: It comprises a vacuum arc extinguishing device as described in any one of claims 1-9.

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