Circuit breaker

Abstract

The utility model relates to a circuit breaker, which comprises a base, a contact arc extinguishing module and a moving contact arc isolating baffle plate, the base is provided with a mounting groove, and the mounting groove comprises a movable contact cavity, an arc extinguishing cavity and a narrow slit channel communicating the movable contact cavity with the arc extinguishing cavity; the contact arc extinguishing module comprises a moving contact of which the rear end is rotatably arranged in the moving contact cavity, and a static contact and an arc extinguishing chamber which are arranged in the arc extinguishing cavity; the bottom side of the front end of the moving contact is electrically connected with the static contact through the narrow slit channel. And the moving contact arc-isolating baffle plate is matched with the sectional area of the narrow slit channel and comprises an arc-isolating sleeve and an arc-isolating baffle plate which are connected with each other, the arc-isolating sleeve is arranged at the bottom side of the moving contact, and the arc-isolating baffle plate tilts up from the rear end of the arc-isolating sleeve, so that when the moving contact and the static contact are separated, the moving contact arc-isolating baffle plate is vertically arranged in the narrow slit channel. Compared with the prior art, the arc extinguishing device can rapidly extinguish the arc, prevent the arc from being sprayed backwards, and enhance the interphase insulation capability and reliability.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of circuit breaker, and relates to a circuit breaker. BACKGROUND

[0002] Due to the fact that the working condition of the traditional power distribution service is generally the upper incoming line, many existing circuit breakers mainly consider this working condition. When the circuit breaker adopts the lower incoming line connection method, the transient recovery voltage value of the breaking is higher, thereby increasing the difficulty of arc extinguishing. Because the overcurrent protection system and the soft connection are subjected to the voltage of the power supply for a long time, the aging of the insulation parts of these parts is accelerated, especially when the internal temperature of the product is relatively high, the risk of insulation breakdown and interphase short circuit is increased. Therefore, the breaking parameter of the existing circuit breaker is relatively low when the circuit breaker is directly used for the lower incoming line, and the breaking reliability is poor. SUMMARY

[0003] The utility model discloses a circuit breaker that can quickly extinguish arc, block the backward spraying of arc, enhance the interphase insulation capacity and reliability, and is used for satisfying the arbitrary switching of the upper and lower incoming lines of the power distribution system to meet the application requirements of scenes such as the alternating current and direct current power conversion system.

[0004] The purpose of the utility model can be realized through the following technical scheme:

[0005] A circuit breaker comprises

[0006] A base is provided with a mounting groove, and the mounting groove comprises a movable contact cavity, an arc extinguishing cavity and a narrow gap channel connecting the movable contact cavity and the arc extinguishing cavity;

[0007] A contact arc extinguishing module comprises a movable contact rotatably arranged at the rear end of the movable contact cavity, and a static contact and an arc extinguishing chamber arranged in the arc extinguishing cavity; the front end bottom side of the movable contact is electrically connected with the static contact through the narrow gap channel;

[0008] An arc separation baffle of the movable contact is matched with the cross section area of the narrow gap channel, and comprises an arc separation sleeve and an arc separation baffle connected with each other; the arc separation sleeve is arranged on the bottom side of the movable contact; the arc separation baffle is raised from the rear end of the arc separation sleeve, so that the arc separation baffle of the movable contact is arranged in the narrow gap channel when the movable contact and the static contact repel each other.

[0009] Further, an arc separation matching boss is arranged at the bottom of the mounting groove, and the arc separation baffle is arc-shaped and curved about the rotation center of the movable contact, so that the top end of the arc separation matching boss is matched with the bottom side of the arc separation baffle in a clearance mode during the repelling and rotating process of the movable contact.

[0010] Further, a bending plate is arranged on the arc separation baffle, and the bending plate is matched with the rear side of the arc separation matching boss in a clearance mode when the movable contact and the static contact repel each other.

[0011] Further, the circuit breaker comprises a rotating shaft, an operating mechanism, a tripping device, a plurality of parallelly arranged mounting slots, and a plurality of arc separation covers; the operating mechanism comprises a traction rod;

[0012] The phase separation plates are arranged between the adjacent mounting slots and separate the adjacent mounting slots, and the U-shaped stepped holes are arranged on the phase separation plates;

[0013] The arc separation cover comprises a cover plate arranged on the movable contact cavity and a half-hole plate arranged on the side of the cover plate; the half-hole plate is arranged in parallel with the U-shaped stepped hole, and the bottom side of the half-hole plate is concave to cooperate with the bottom side of the U-shaped stepped hole to form a limiting hole structure;

[0014] The rotating shaft passes through the limiting hole structure and is in transmission connection with the movable contacts in the mounting slots;

[0015] The operating mechanism is used to drive the movable contacts to rotate through the rotating shaft, and drive the traction rod to trip through the tripping device, so as to realize the opening and closing of the operating mechanism and the circuit breaker.

[0016] Further, the rotating shaft is provided with a circular flange, and the circular flange is connected in clearance fit with the limiting hole structure.

[0017] Further, the rear side of the cover plate is further provided with an arc blocking wall, and the arc blocking wall is used to separate the movable contact cavity and the tripping device.

[0018] Further, side plates are arranged on the side edges of the cover plate and located on both sides of the half-hole plate, and the side plates protrude out of the plane where the half-hole plate is located; and / or,

[0019] The rear end of the side edge of the cover plate is provided with a baffle, and the baffle is arranged vertically on the phase separation plate.

[0020] Further, an arc-shaped clamping groove is arranged vertically on the cover plate;

[0021] An arc-shaped clamping plate is arranged on the traction rod, the arc-shaped clamping plate has an arc-shaped outer edge, the arc-shaped outer edge is in sliding connection with the arc-shaped clamping groove, and the arc-shaped outer edge and the traction rod are coaxially arranged together.

[0022] Further, the circuit breaker further comprises a cover shell arranged outside the tripping device; and / or,

[0023] The front end of the base is further provided with an arc extinguishing groove in front of the arc extinguishing chamber, and the arc extinguishing groove is further provided with an arc extinguishing cover; and / or,

[0024] The base is further provided with a middle sleeve, the middle sleeve is provided with an opening for assembling accessories, and a plug is detachably arranged at the opening; and / or,

[0025] The base is further provided with an arc separation plate for separating the movable contact cavity and the tripping device; and / or,

[0026] The operating mechanism is assembled on the moving contact cavity of one of the mounting grooves, and an arc separation limiting piece is clamped on the front end side wall of the moving contact cavity.

[0027] Further, a wedge-shaped clamping block is arranged on the side wall of the plug, a wedge-shaped clamping matching block is arranged on the opening side wall, the wedge-shaped clamping block and the wedge-shaped clamping matching block are opposite in slope when assembled, and the wedge-shaped clamping block and the wedge-shaped clamping matching block are in abutment after assembly; and / or,

[0028] The middle sleeve is further provided with a cover for pressing the plug; and / or,

[0029] The arc separation plate is further provided with clamping bosses on both sides of the top end, and the clamping bosses are clamped between the top side of the middle sleeve and the interval plate.

[0030] Compared with the prior art, the utility model has the following beneficial effects:

[0031] 1) The utility model discloses a moving contact bottom side is provided with arc separation sleeve and the arc separation baffle of lifting, when moving contact and static contact repel, from the projection direction of arc extinguishing chamber to moving contact cavity, moving contact arc separation baffle lays in the cross section of whole narrow slit passage, to avoid arc injection to moving contact cavity, improved the reliability of circuit breaker. Meanwhile, the utility model discloses the arc-shaped bending setting of arc separation baffle, and the clearance setting with the arc separation cooperation boss on the base, to keep the cross section coverage of moving contact arc separation baffle in the narrow slit passage in the whole repelling process, through the tail of moving contact arc separation baffle is provided with a bending plate, and then cooperates the arc separation cooperation boss on the base, can change the direction of arc injection from the gap here to back, gradually slows down the impact of air pressure, avoids direct impact on the weak area of back insulation, to further improve the reliability of circuit breaker.

[0032] 2) The utility model discloses a moving contact cavity is provided with a cover plate, and the half hole plate, side plate, baffle are set up on the side of cover plate, and the arc baffle is set up on the back side of cover plate to enclose the half sealed chamber of moving contact cavity, limites arc injection to adjacent phase, to the rear and upper direction of moving contact cavity, better maintain the high pressure state of gas in the rear of whole contact area, make arc more, faster enter arc extinguishing chamber, and the interphase weak area such as rotating shaft, traction rod is blocked, and the interphase insulation capacity in short circuit breaking process is improved.

[0033] 3) The utility model discloses a moving contact cavity front end is additionally provided with an arc separation limiting piece, and the arc separation limiting piece separates arc extinguishing chamber area and operating mechanism area, and blocks arc from the area above base and directly sprays to operating mechanism, reduces the channel of arc movement back, and improves the reliability of circuit breaker.

[0034] 4)The utility model discloses a traction rod is set up arc clamping plate on the sliding fit cover plate's arc clamping groove to play the rotating support effect to the traction rod, also cooperate with the recess in the sleeve and limit the arc from the traction rod to adjacent phase movement, compact structure, small space occupation.

[0035] 5)The utility model discloses a baffle is additionally arranged at the tail of arc separation cover, makes the interphase creepage distance path of its interphase creepage distance path increase the distance of bypassing the baffle, improves the interphase insulation capacity at the release device, and the side plate of protruding of arc separation cover side edge also can strengthen the insulation of operating mechanism to adjacent phase conducting loop, even if operating mechanism is in special situation and is contacted with the current assembly phase and is electrified, can guarantee the interphase insulation strength, improves circuit breaker reliability.

[0036] 6)The utility model discloses the sleeve is set up on the base to cover and protect internal structure, and the opening is set up in the sleeve to assemble the accessory such as microswitch, and the plug that is suitable for the opening is set up to basically stop the opening of the accessory of sleeve and is left, and then combining the rib on two arc separation covers, can block the arc and high pressure gas in the sleeve accessory groove, makes the arc separation system more perfect. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 It is the structure schematic diagram of one circuit breaker in example 1;

[0038] Figure 2 It is the assembly process schematic diagram of operating mechanism, movable contact, release device, arc separation cover on base;

[0039] Figure 3 It is the structure schematic diagram of operating mechanism;

[0040] Figure 4 It is the structure schematic diagram of release device;

[0041] Figure 5 It is the assembly process schematic diagram of arc separation limiting piece 9 on base;

[0042] Figure 6 It is the cutaway schematic diagram of B phase of one circuit breaker in example 1 closing state;

[0043] Figure 7 It is the cutaway schematic diagram of C phase of one circuit breaker in example 1 closing state;

[0044] Figure 8 It is the cutaway schematic diagram of B phase of one circuit breaker in example 1 repulsion;

[0045] Figure 9 It is the cutaway schematic diagram of one circuit breaker in example 1 at pivot;

[0046] Figure 10Figure 1 is a schematic view of a traction rod and a middle sleeve;

[0047] Figure 11 Figure 2 is a schematic view of a base;

[0048] Figure 12 、 Figure 30 Figure 3 is a schematic view of a middle sleeve;

[0049] Figure 13 Figure 4 is a schematic view of a traction rod;

[0050] Figure 14 、 Figure 28 Figure 5 is a schematic view of a first arc separation cover in Example 1;

[0051] Figure 15 、 Figure 29 Figure 6 is a schematic view of a second arc separation cover in Example 1;

[0052] Figure 16 Figure 7 is a schematic view of a plug;

[0053] Figure 17 Figure 8 is a schematic view of a rotating shaft;

[0054] Figure 18 Figure 9 is a schematic view of an arc separation plate;

[0055] Figure 19 Figure 10 is a schematic view of an arc separation limiting member;

[0056] Figure 20 Figure 11 is a schematic view of a moving contact arc separation baffle plate;

[0057] Figure 21 Figure 12 is a schematic view of a first arc separation cover in Example 2;

[0058] Figure 22 Figure 13 is a schematic view of a second arc separation cover in Example 2;

[0059] Figure 23 Figure 14 is a schematic view of an arc separation plate in Example 2;

[0060] Figure 24 Figure 15 is a schematic view of a cover in Example 2;

[0061] Figure 25 、 Figure 26 、 Figure 27 Figure 16 is a schematic view of an electric circuit breaker in Example 2;

[0062] Figure 17 is a mark description of the drawings;

[0063] 1 - first arc separation cover, 101 - first half hole plate, 102 - first arc blocking wall, 103 - first arc-shaped clamping groove, 104 - first blocking plate, 105 - first rib plate, 106 - first side plate, 2 - second arc separation cover, 201 - second half hole plate, 202 - second arc blocking wall, 203 - second arc-shaped clamping groove, 204 - second blocking plate, 205 - second rib plate, 206 - second side plate, 3 - traction rod, 301 - arc-shaped clamping plate, 4 - arc separation plate, 401 - clamping boss, 5 - base, 501 - narrow slit passage, 502 - arc separation matching boss, 503 - U-shaped step hole, 504 - arc blocking wall clamping groove, 505 - groove, 6 - middle sleeve, 601 - groove, 602 - first opening, 603 - second opening, 604 - third opening, 7 - moving contact arc separation blocking plate, 701 - bending plate, 8 - moving contact, 9 - arc separation limiting piece, 901 - arc separation limiting piece boss, 10 - plug, 1001 - wedge-shaped clamping block, 11 - cover, 12 - rotating shaft, 1201 - circular flange, 1202 - rib feature, 13 - first shaft, 15 - arc extinguishing chamber, 16 - arc extinguishing cover, 17 - operating mechanism, 18 - rivet, 19 - release, 21 - shell, 22 - second shaft. DETAILED DESCRIPTION

[0064] The utility model will be explained in detail below in combination with the drawings and specific embodiments. The following embodiments are implemented on the premise of the above technical solutions of the utility model, and detailed implementation modes and specific operation processes are given, but the protection scope of the utility model is not limited to the following embodiments.

[0065] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0066] A circuit breaker comprises

[0067] The base 5 is provided with a mounting groove, and the mounting groove comprises a moving contact cavity, an arc extinguishing cavity, and a narrow slit passage 501 communicating the moving contact cavity and the arc extinguishing cavity;

[0068] The contact arc extinguishing module comprises a moving contact 8 rotatably arranged at the rear end of the moving contact cavity, and a static contact and an arc extinguishing chamber 15 arranged in the arc extinguishing cavity; the front end bottom side of the moving contact 8 is electrically connected with the static contact through the narrow slit passage 501;

[0069] The moving contact arc separation blocking plate 7 is matched with the sectional area of the narrow slit passage 501, and comprises an arc separation sleeve and an arc separation blocking plate connected with each other; the arc separation sleeve is arranged on the bottom side of the moving contact 8, and the arc separation blocking plate is raised from the rear end of the arc separation sleeve, so that when the moving contact 8 and the static contact repel each other, the moving contact arc separation blocking plate 7 is erected in the narrow slit passage 501.

[0070] The utility model arranges an arc isolation sleeve on the raised arc isolation baffle at the bottom side of the moving contact, so that when the moving contact and the static contact are repelled, the moving contact arc isolation baffle is laid on the cross section of the entire narrow slot channel from the arc extinguishing cavity where the arc is generated to the moving contact cavity, so as to prevent the arc from being ejected into the moving contact cavity, thereby improving the reliability of the circuit breaker.

[0071] In some specific embodiments, an arc-isolating mating boss 502 is provided at the bottom of the mounting groove, and the arc-isolating baffle is curved in an arc shape about the rotation center of the moving contact 8, so that during the rotation of the moving contact 8, the top of the arc-isolating mating boss 502 is loosely matched with the bottom side of the arc-isolating baffle.

[0072] The arc baffle is arranged in an arc shape so as to maintain the cross-sectional coverage of the moving contact arc baffle in the narrow slot channel during the entire opening process, thereby ensuring the reliability of the entire opening process.

[0073] In some specific embodiments, a bent plate 701 is provided on the arc isolation baffle. When the moving contact 8 is separated from the static contact, the bent plate 701 is in clearance fit with the rear side of the arc isolation matching boss 502 .

[0074] A bent plate is provided at the tail of the moving contact arc-isolating baffle, which, together with the arc-isolating mating boss on the base, can change the direction of the arc ejecting backward from the gap here, gradually slowing down the air pressure shock, avoiding direct impact on the relatively weak insulation area behind, and further improving the reliability of the circuit breaker.

[0075] In some specific embodiments, the circuit breaker includes a rotating shaft 12, an operating mechanism 17, a trip unit 19, a plurality of parallel mounting slots, and a plurality of arc isolation covers; the operating mechanism 17 includes a traction rod 3;

[0076] Adjacent mounting slots are separated by phase partitions, each of which is provided with a U-shaped stepped hole 503.

[0077] The arc isolation cover includes a cover plate provided on the movable contact cavity and a half-hole plate provided on the side of the cover plate; the half-hole plate is arranged in parallel with the U-shaped step hole 503, and the bottom side of the half-hole plate is in an upward concave arc shape to cooperate with the bottom side of the U-shaped step hole 503 to form a limiting hole structure;

[0078] The rotating shaft 12 passes through the limiting hole structure and is in transmission connection with the moving contacts 8 in the plurality of mounting slots;

[0079] The operating mechanism 17 is used to drive the moving contact 8 to rotate through the rotating shaft 12, and to drive the traction rod 3 to trip through the release 19, thereby realizing the opening and closing of the operating mechanism and the circuit breaker.

[0080] By setting the cover plate in the moving contact chamber to limit the upward ejection of the arc, the high pressure state of the gas at the rear of the entire contact area is better maintained, the arc enters the arc extinguishing chamber 15 more and faster, and the inter-phase insulation capability during short-circuit breaking is improved.

[0081] In some specific embodiments, a circular flange 1201 is provided on the rotating shaft 12, and the circular flange 1201 is connected with the limiting hole structure. By providing the circular flange on the rotating shaft to increase the creepage distance, the inter-phase ejection of the arc is limited, and the inter-phase insulation capability during short-circuit breaking is further improved.

[0082] In some preferred embodiments, the U-shaped stepped hole 503 has a concave cross-section, the circular flange 1201 is embedded in the U-shaped stepped hole 503, and cooperates with the gap of the half-hole plate. By the U-shaped stepped hole 503 with a concave cross-section to better fit the circular flange 1201, the assembly stability is enhanced, and at the same time, the creepage distance at the U-shaped stepped hole 503 is increased, and the inter-phase insulation capability during short-circuit breaking is further improved.

[0083] In some specific embodiments, the operating mechanism 17 can adopt the conventional operating mechanism in the existing circuit breaker, or can adopt the operating mechanism as shown in Figure 3 .

[0084] In some specific embodiments, the rear side of the cover plate is further provided with an arc blocking wall, and the arc blocking wall is used to separate the moving contact chamber and the release 19. By providing the arc blocking wall between the moving contact chamber and the release 19 as a secondary arc separation device, the ejection of a small amount of arc that runs backward through the arc separation baffle and the like is limited, and the inter-phase insulation capability during short-circuit breaking is further improved.

[0085] In some specific embodiments, the release 19 can adopt the conventional release in the existing circuit breaker, or can adopt the release as shown in Figure 4 .

[0086] As a preferred technical solution, the release 19 is electrically connected with the moving contact 8 through a soft connection; and the bottom side of the arc blocking wall is provided with a clearance groove. The arc blocking wall is also used to limit the backward bending extension distance of the soft connection, so as to avoid the contact of other components outside the connection end of the soft connection with the release 19.

[0087] As a preferred technical solution, the narrow slit passage 501 includes a side plate standing at intervals; and the two sides of the bottom side of the mounting groove are respectively provided with arc blocking wall clamping grooves 504.

[0088] The front side of the cover plate is overlapped on the top of the side plate, and the lower side of the arc blocking wall is embedded in the corresponding arc blocking wall clamping groove 504.

[0089] In some specific embodiments, side plates are arranged on the side edges of the cover plate, on both sides of the half-hole plate, and protrude out of the plane of the half-hole plate.

[0090] In some specific embodiments, baffle plates are arranged at the rear ends of the side edges of the cover plate and stand on the spaced plates. The side plates and baffle plates arranged on the side edges of the cover plate, i.e., the spaces, further increase the creepage distance between the spaces and improve the insulation capability between the spaces during short-circuit breaking.

[0091] In some specific embodiments, arc-shaped clamping grooves are arranged on the cover plate; the traction rod 3 is provided with an arc-shaped clamping plate 301, which has an arc-shaped outer edge that is in sliding connection with the arc-shaped clamping grooves and is coaxial with the traction rod 3. The arc-shaped clamping plate 301 arranged on the traction rod cooperates with the arc-shaped clamping grooves on the cover plate to limit the movement of the electric arc from the traction rod to the adjacent phase, thereby improving the insulation capability between the phases during short-circuit breaking.

[0092] In some specific embodiments, the circuit breaker further comprises a shell 21 that is sleeved outside the release 19.

[0093] In some specific embodiments, the base 5 is further provided with an arc-extinguishing groove at the front end thereof, in front of the arc-extinguishing chamber 15, and the arc-extinguishing chamber 15 is further provided with an arc-extinguishing cover 16.

[0094] In some specific embodiments, the base 5 is further provided with a middle sleeve 6, which is sleeved on the base 5, and the middle sleeve 6 is provided with an opening for assembling accessories and a plug 10 that is detachably arranged at the opening.

[0095] As a preferred technical solution, the middle sleeve 6 is provided with a recess 601 that is sleeved on the arc-shaped clamping plate 301.

[0096] In some specific embodiments, the base 5 is further provided with an arc-separating plate 4 for separating the moving contact cavity and the release 19.

[0097] In some specific embodiments, the operating mechanism 17 is assembled in the moving contact cavity of one of the mounting grooves, and an arc-separating limiting member 9 is clamped on the front end side wall of the moving contact cavity, which separates the arc-extinguishing chamber from the operating mechanism, blocks the electric arc from directly spraying from the area above the base to the operating mechanism, reduces the channel for the movement of the electric arc, and improves the reliability of the circuit breaker.

[0098] In some specific embodiments, the side wall of the plug 10 is provided with a wedge-shaped clamping block 1001, and the side wall of the opening is provided with a wedge-shaped clamping matching block. When assembled, the wedge-shaped clamping block 1001 and the wedge-shaped clamping matching block are opposite to each other in slope, and after assembly, the wedge-shaped clamping block 1001 and the wedge-shaped clamping matching block are in abutment in right angle.

[0099] In some specific embodiments, the middle sleeve 6 is further provided with a cover 11 for pressing the plug 10.

[0100] In some specific embodiments, clamping bosses 401 extend outwardly from both sides of the top end of the arc isolation plate 4 , and the clamping bosses 401 are clamped between the middle sleeve 6 and the top side of the phase partition.

[0101] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0102] Example 1:

[0103] like Figure 1 The circuit breaker shown here has a bottom-feed configuration, including phases A, B, and C, and a rated voltage level of up to 1000V. It primarily increases gas pressure in the arc generation zone to prevent backward ejection of gas and arc, allowing the arc to quickly enter the arc extinguishing chamber. When the breaking voltage and current are high, any arc that has not been completely extinguished enters the arc hood for secondary extinguishing. This also enhances the insulation capacity between phases, ensuring the reliability of the insulation between phases.

[0104] This embodiment includes: a first arc isolation cover 1, a first half-hole plate 101, a first arc blocking wall 102, a first arc-shaped groove 103, a first baffle 104, a first rib 105, and a first side plate 106; a second arc isolation cover 2, a second half-hole plate 201, a second arc blocking wall 202, a second arc-shaped groove 103, a second baffle 204, a second rib 205, and a second side plate 206; a traction rod 3, an arc-shaped clamping plate 301; an arc isolation plate 4, a clamping boss 401; a base 5, a narrow slit channel 501, an arc isolation matching boss 502, U-shaped stepped hole 503, arc-blocking wall slot 504; middle sleeve 6, groove 601, first opening 602, second opening 603, third opening 604; moving contact arc-isolating baffle 7, bending plate 701; moving contact 8; arc-isolating limiter 9, arc-isolating limiter boss 901; plug 10, wedge-shaped block 1001; cover 11; rotating shaft 12, circular flange 1201; first shaft 13; arc-extinguishing chamber 15; arc-extinguishing cover 16; operating mechanism 17; rivet 18; tripper 19; second shaft 22.

[0105] This embodiment is implemented in the following ways: Figure 2 As shown, the moving contact arc isolation baffle 7 is sleeved on the moving contact 8 and fixed by rivets 18. Specifically, the moving contact arc isolation baffle 7 includes an arc isolation sleeve, which is arranged on both sides and the bottom side of the moving contact 8 and has a through hole. The side wall of the moving contact 8 has a mounting hole and is connected by a rivet 18 passing through the through hole and the mounting hole; the operating mechanism 17 is connected to the rotating shaft by a shaft 22, as shown in FIG. Figure 2 、 Figure 6As shown. The operating mechanism 17 can adopt the operating mechanism of the circuit breaker in the existing technology, such as CN219144097U, etc., which can realize the rotation of the moving contact 8 by the rotating shaft 12, and the closing and opening of the circuit breaker by the cooperation of the traction rod 3 and the release 19. Figure 2 As shown, the operating mechanism 17, tripper 19, first arc shielding cover 1, second arc shielding cover 2, arc shielding plate 4, rotating shaft 12 and moving contact 8 and other components are installed from the top of the base into the base. Finally, the second arc shielding wall 202 of the second arc shielding cover 2 is inserted into the arc shielding wall slot 504 of the base 5 to complete the assembly. The assembly process of the first arc shielding cover 1 and arc shielding plate 4 is the same. Then, the static contact, arc extinguishing chamber 15 and other components are installed in sequence. Figure 18 As shown, clamping bosses 401 are provided on both sides of the arc isolation plate 4. When the middle sleeve 6 assembled later is closed, the middle sleeve 6 will press the clamping bosses 401 to the top side of the phase partition, and will also press the upper planes of the first arc isolation cover 1 and the second arc isolation cover 2, thereby fixing the positions of the three arc isolation parts.

[0106] like Figure 19 As shown, the arc-isolating limiting member 9 includes a limiting member body, a limiting inclined plate provided on the limiting member body, and an arc-isolating limiting member boss 901 symmetrically distributed at the bottom of the limiting member body. Figure 11 As shown, a corresponding groove 505 is also formed on the B phase of the base 5; Figure 5 As shown, during installation, use the handle to operate the operating mechanism 17 to the re-engagement position, that is, the position away from the groove 505, and insert the arc limiting member boss 901 of the arc limiting member 9 into the groove 505 on the base 5. At this time, the limiting inclined plate tilts in the direction away from the operating mechanism 17. After the middle sleeve 6 is closed, the middle sleeve 6 will also press the arc limiting member 9 to complete the separation of the arc extinguishing chamber area and the operating mechanism area, and prevent the arc from directly spraying from the area above the base 5 to the operating mechanism 17. After all the internal parts are assembled, close the middle sleeve 6 and fix it with screws through the screw holes on the middle sleeve 6 and the base 5. Figure 12 As shown, accessory slots for installing accessories are left on both sides of the middle sleeve 6. The bottom of the accessory slot has a first opening 602, a second opening 603, and a third opening 604. The first opening 602 and the third opening 604 are used to leave space for the micro switch of the accessory. The rotating shaft 12 is provided with a rib feature 1202 extending in the axial direction (as shown in FIG. Figure 17 As shown), when the shaft 12 rotates, the rib feature 1202 rotates accordingly, so that the position information of the shaft 12 can be transmitted according to the position of the rib feature 1202; when the circuit breaker is equipped with accessories, the outer contour of the accessories can basically block the three openings. When the accessories are not equipped, as shown Figure 7 As shown, a plug 10 can be installed at the corresponding position. The outer contour of the plug 10 is basically the same as the outer contour of the accessory. Figure 16The plug 10 is provided with a wedge-shaped clamping block 1001, which is embedded in the middle sleeve 6 during assembly, and then the plug 10 is pressed on the top of the plug 10 by a small cover, and the plug 10 is fixed on the base 5 by screws. In actual use, if the voltage of the power distribution system is high and the expected fault current is large, another arc extinguishing cover 16 can be arranged Figure 1 The arc extinguishing cover 16 is shown, and the inside can be installed with arc extinguishing grid or metal mesh, etc., to help the circuit breaker to achieve reliable breaking.

[0107] Working principle:

[0108] Figure 6 is the closing schematic diagram of the circuit breaker in normal operation, Figure 8 is the schematic diagram of the circuit breaker breaking the fault current. When the fault current comes, the moving contact 8 is quickly repelled under the action of the electric repulsive force, and the moving contact arc separation baffle 7 sleeved thereon also rotates together. After the contact is repelled, an arc is generated. The arc is attracted into the arc extinguishing chamber 15 on one hand due to the magnetic action. On the other hand, the inside wall between the arc extinguishing chamber 15 and the moving contact cavity is provided with a plastic part to separate a narrow slit passage 501, and the end of the narrow slit passage 501 is blocked by the moving contact arc separation baffle 7, which can limit the backward arc spray. After the arc is generated, the temperature in the contact area rises sharply, which can cause the air pressure in the narrow area to rise rapidly. The high-pressure gas will quickly move towards the arc extinguishing chamber 15, and the arc will be blown towards the arc extinguishing chamber 15. The arc entering the arc extinguishing chamber 15 is cut and cooled by the grid, and most of the arc is extinguished. There is enough gap at the front end of the arc extinguishing chamber 15 as a buffer zone to reduce the gas pressure in the grid area. The high-pressure gas is discharged through the gas outlet after being buffered, and the whole gas flow movement channel is smooth, avoiding the back strike caused by the arc rebound. The arc that is not extinguished is sprayed out of the circuit breaker body and enters the arc extinguishing cover 16, where it is cooled and extinguished by the metal hole plate. The gas pressure is buffered again and gradually released, ensuring the reliability of breaking. The circuit breaker can quickly extinguish the arc and block the backward spray of the arc, thereby improving the interphase insulation capability of the circuit breaker.

[0109] The moving contact 8 and the rotating shaft 12 are both moving parts, so there must be enough gap between the structures that block the backward spray of the arc to ensure the reliability of movement, so part of the arc is still sprayed backward. As shown in Figure 8 A bent plate 701 is provided at the tail of the moving contact arc separation baffle 7, and a corresponding arc separation matching boss 502 is provided at the corresponding position of the bottom of each phase of the base 5. When the high-pressure gas with electric arc moves backward through the gap between the moving contact arc separation baffle 7 and the arc separation matching boss 502, it will hit the bent plate 701 and change the direction of movement, guiding the gas pressure shock wave to the bottom of the inner cavity of the base 5 with the highest insulation and strength, gradually slowing down the gas pressure impact, avoiding direct impact on the relatively weak area behind. This is also beneficial to improving the interphase insulation. Even if the moving contact 8 is not at the highest repelling position as shown, it is also effective.

[0110] As Figure 9 , 11 , 17 shown, the shaft 12 is symmetrical around the circular flange 1201, the base 5 on the corresponding position symmetrical U-shaped step hole 503, as Figure 14 , 15 , 28, 29 shown, the first arc cover 1 is provided with a first half hole plate 101, the second arc cover 2 is provided with a second half hole plate 201; after assembly, the symmetrical U-shaped step hole 503 and the first half hole plate 101, the second half hole plate 201 form two round holes, just the space required for the rotation of the shaft 12; to ensure the smooth movement of the shaft 12 in the closed round hole, the gap must be left between the shaft 12 and the round hole, and the lubricating grease is coated; while the circular flange 1201 on the shaft 12 can completely block the gap, increase the creepage distance and electrical clearance between any two phases of the circuit breaker, and at the same time can effectively block the arc to the adjacent phase, improve the interphase insulation capacity at the shaft.

[0111] As Figure 5 , 8 shown, the arc limiting member boss 901 of the arc limiting member 9 is inserted into the groove 505 on the base 5, and when the middle sleeve 6 is closed, the middle sleeve 6 will also press the arc limiting member 9, completing the separation of the arc chamber area and the operating mechanism area, blocking the arc from the area above the base directly to the operating mechanism 17; the arc limiting plate 4 is provided in front of the release 19, which can block the arc directly to the release 19. As Figure 13 shown, the arc-shaped clamping plate 301 is provided on the traction rod 3, and the center line of the outer arc surface is collinear with the rotation center line of the traction rod 3, as Figure 30 shown, the area corresponding to the middle sleeve 6 is provided with a recess 601; as Figure 5 , 14 , 15 shown, the first arc cover 1 is provided with a first arc-shaped clamping groove 103, and the second arc cover 2 is provided with a second arc-shaped clamping groove 203, which cooperates with the recess 601 to completely cover the arc-shaped clamping plate 301 on the traction rod 3, no matter where the traction rod 3 rotates in the stroke, it can effectively block the B-phase arc from the A and C phases, and at the same time increase the interphase creepage distance and improve the interphase insulation capacity.

[0112] Considering that the release area is in a high voltage holding and high temperature environment for a long time, the surrounding insulation parts age quickly, in order to ensure safety, compared with the existing circuit breaker, the safety margin of the insulation strength of the circuit breaker is increased. As Figure 5 , 14As shown in Figures 1 and 15, by adding a first baffle 104 to the rear of the first arc-isolating cover 1 and a second baffle 204 to the rear of the second arc-isolating cover 2, the baffles are positioned vertically between the corresponding phase partitions after the arc-isolating covers are assembled, thereby increasing the interphase creepage distance path by bypassing the first baffle 104 and the second baffle 204. Similarly, the first ribs 106 and the second ribs 206 protruding from the sides of the first arc-isolating cover 1 and the second arc-isolating cover 2 also strengthen the insulation between the operating mechanism 17 and the A and C phase conductive circuits. These structural designs can also prevent certain special situations. For example, if the operating mechanism 17 comes into contact with the B phase conductive circuit under certain special circumstances and becomes energized, this structure can also ensure the safety of the phase-to-phase insulation.

[0113] like Figure 7 As shown, the first arc blocking wall 102 of the first arc isolation cover 1 blocks the high-pressure gas with the arc, preventing the arc from spraying toward the trip unit area; Figure 10 As shown, the first arc isolation cover 1 also has an opening at a position corresponding to the first opening 602 of the middle sleeve 6, while the second opening 603 is completely blocked by the first arc isolation cover 1. The plug 10 can basically block the first opening 602, and only a small amount of arc escapes from here; Figure 28 As shown, a first rib 105 is provided on the first arc-isolating cover 1, which is in close contact with the outer wall of the concave accessory slot surrounding the first opening 602. This can block the arc escaping from the first opening 602 within the accessory slot of the middle sleeve 6. In this way, the trip unit area of ​​phase C will not be affected by the backward spray of high-pressure gas carrying the arc. Similarly, on phase A, the second arc-blocking wall 202 of the second arc-isolating cover 2 blocks the high-pressure gas carrying the arc, preventing the arc from spraying toward the trip unit area. The second arc-isolating cover 2 is also provided with a second rib 205, which is in close contact with the outer wall of the concave accessory slot surrounding the third opening 604. This can block the arc escaping from the third opening 604 within the accessory slot of the middle sleeve 6. In this way, the trip unit area of ​​phase A will not be affected by the backward spray of high-pressure gas carrying the arc.

[0114] Combined with the above analysis, it can be seen that in phase A, the second arc-isolating cover 2, the base 5, the middle sleeve 6, the plug 10 and the rotating shaft 12 together form a semi-sealed space, which limits the arc from being ejected toward phase B, backward, upward, etc.; in phase C, the first arc-isolating cover 1, the base 5, the middle sleeve 6, the plug 10 and the rotating shaft 12 together form a semi-sealed space, which limits the arc from being ejected toward phase B, backward, upward, etc.; this structural design allows more arcs to enter the arc extinguishing chamber faster.

[0115] Example 2:

[0116] A circuit breaker, which is different from the embodiment 1 only in that the first arc isolation cover 1 is configured as follows: Figure 21 The second arc shield 2 is configured as shown in FIG. Figure 22The shown molding, the rear side is not provided with the arc baffle, the arc baffle 4 becomes as shown in Figure 23 The shown baffle, additionally as shown in Figure 24 The shown cover 21, assembled as shown in Figure 25 The shown appearance, each phase is equipped with an arc baffle 4 and cover 21, the arc baffle 4 is used to replace the arc baffle, and the cover 21 is sleeved on the release 19, and the same function can be realized.

[0117] The scheme can also divide the circuit breaker into several grades with different performances to meet different market demands. Figure 26 As shown, without baffle 4 and cover 21, it can be used as a basic level, as shown in Figure 27 As shown, without cover 21, it can be used as a higher level.

[0118] The above description of the embodiments is for the convenience of the ordinary skilled in the art to understand and use the utility model. Those skilled in the art can obviously easily make various modifications to these embodiments, and apply the general principles described herein to other embodiments without creative labor. Therefore, the utility model is not limited to the above embodiments, and the improvements and modifications made by those skilled in the art without departing from the scope of the utility model should be within the protection scope of the utility model.

Claims

1. A circuit breaker, characterized in that: include The base (5) is provided with a mounting groove, wherein the mounting groove includes a moving contact cavity, an arc extinguishing cavity, and a narrow slit channel (501) connecting the moving contact cavity and the arc extinguishing cavity; A contact arc extinguishing module comprises a movable contact (8) whose rear end is rotatably arranged in a movable contact cavity, and a static contact and an arc extinguishing chamber (15) arranged in the arc extinguishing cavity; the bottom side of the front end of the movable contact (8) is electrically connected to the static contact through a narrow slit channel (501); The moving contact arc isolation baffle (7) is adapted to the cross-sectional area of ​​the narrow slot channel (501), and comprises an arc isolation sleeve and an arc isolation baffle connected to each other, wherein the arc isolation sleeve is arranged on the bottom side of the moving contact (8), and the arc isolation baffle is tilted from the rear end of the arc isolation sleeve so that when the moving contact (8) and the static contact are separated, the moving contact arc isolation baffle (7) is upright in the narrow slot channel (501).

2. The circuit breaker according to claim 1, wherein: An arc-isolating mating boss (502) is provided at the bottom of the mounting groove, and the arc-isolating baffle is curved in an arc shape about the rotation center of the moving contact (8), so that during the moving contact (8) is rotated, the top of the arc-isolating mating boss (502) is loosely mated with the bottom side of the arc-isolating baffle.

3. The circuit breaker according to claim 2, wherein: A bent plate (701) is provided on the arc isolation baffle. When the moving contact (8) and the static contact are separated, the bent plate (701) is clearance-matched with the rear side of the arc isolation matching boss (502).

4. The circuit breaker according to claim 1, wherein: The circuit breaker comprises a rotating shaft (12), an operating mechanism (17), a tripper (19), a plurality of parallel mounting slots, and a plurality of arc-isolating covers; the operating mechanism (17) comprises a traction rod (3); Adjacent installation slots are provided with phase partitions and separated by the phase partitions, wherein the phase partitions are provided with U-shaped step holes (503); The arc isolation cover comprises a cover plate provided on the movable contact cavity, and a half-hole plate provided on the side of the cover plate; the half-hole plate and the U-shaped step hole (503) are arranged in parallel, and the bottom side of the half-hole plate is in an upward concave arc shape to match the bottom side of the U-shaped step hole (503) to form a limiting hole structure; The rotating shaft (12) passes through the limiting hole structure and is in transmission connection with the moving contacts (8) in the plurality of mounting slots; The operating mechanism (17) is used to drive the moving contact (8) to rotate through the rotating shaft (12), and to realize closing and opening of the switch through the cooperation between the traction rod (3) and the release (19).

5. The circuit breaker according to claim 4, wherein: An arc blocking wall is also provided on the rear side of the cover plate, and the arc blocking wall is used to separate the moving contact cavity and the tripper (19).

6. The circuit breaker according to claim 4, wherein: Side plates are provided on the sides of the cover plate, located on both sides of the semi-hole plate, and the side plates protrude out of the plane where the semi-hole plate is located; and / or, A baffle is provided at the rear end of the side of the cover plate, and the baffle is vertically arranged on the phase partition.

7. The circuit breaker according to claim 4, wherein: The cover plate is provided with an arc-shaped slot; The traction rod (3) is provided with an arc-shaped clamping plate (301), and the arc-shaped clamping plate (301) has an arc-shaped outer edge. The arc-shaped outer edge is slidably connected to the arc-shaped clamping groove and is coaxially arranged with the traction rod (3).

8. The circuit breaker according to claim 4, wherein: The circuit breaker further comprises a cover (21) sleeved outside the trip unit (19); and / or, An arc extinguishing groove is further provided at the front end of the base (5) and in front of the arc extinguishing chamber (15), and an arc extinguishing cover (16) is further provided on the arc extinguishing groove; and / or, The base (5) is further covered with a middle sleeve (6), the middle sleeve (6) is provided with an opening for assembling accessories, and a plug (10) detachably provided at the opening; and / or, The base (5) is further provided with an arc isolation plate (4) for separating the movable contact chamber and the tripper (19); and / or, The operating mechanism (17) is assembled on the movable contact cavity of one of the mounting slots, and an arc-isolating limiting member (9) is clamped on the front end side wall of the movable contact cavity.

9. The circuit breaker according to claim 8, wherein: A wedge-shaped clamping block (1001) is provided on the side wall of the stopper (10), and a wedge-shaped clamping fitting block is provided on the side wall of the opening. During assembly, the wedge-shaped clamping block (1001) faces the inclined surface of the wedge-shaped clamping fitting block. After assembly, the wedge-shaped clamping block (1001) abuts against the right-angled surface of the wedge-shaped clamping fitting block.

10. The circuit breaker according to claim 9, wherein: Clamping bosses (401) extend outwards from both sides of the top end of the arc isolation plate (4), and the clamping bosses (401) are clamped between the middle sleeve (6) and the top side of the phase partition.

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