CN214203580U

CN214203580U - Terminal cover structure of circuit breaker

Info

Publication number: CN214203580U
Application number: CN202022653349.9U
Authority: CN
Inventors: 陆俊谦; 刘泽州; 曹大军; 李儒光
Original assignee: Noark Electrics Shanghai Co Ltd
Current assignee: Noark Electrics Shanghai Co Ltd
Priority date: 2020-11-17
Filing date: 2020-11-17
Publication date: 2021-09-14
Anticipated expiration: 2030-11-17

Abstract

The utility model provides a terminal cover structure of circuit breaker, includes the fixing base and the cover body, and the fixing base is installed on the casing of circuit breaker, and the cover body is installed on fixing base and/or casing, and the cover body forms the installation cavity with the fixing base cooperation, and the fixing base is equipped with the chamber of putting out an arc that corresponds with the utmost point of circuit breaker, and the chamber of putting out an arc is for having the passageway shape of advancing arc mouth and gas vent, advances the arc mouth and is linked together with the arc passageway of casing. The utility model provides a terminal cover structure of circuit breaker, to put out the arc room design for the semi-enclosed construction of passageway shape with the electric arc passageway intercommunication, electric arc discharges again after the cooling is cut apart to the room of putting out the arc, effectively protects the outer rear end electrical apparatus of circuit breaker, because the room of putting out the arc is the semi-enclosed construction who is independent of the terminal installation cavity, has also avoided electric arc to the damage of terminal simultaneously, when improving the circuit breaker protection level, guarantees that electric arc can not splash, thoroughly isolated electric arc and terminal, effectively protects the terminal.

Description

Terminal cover structure of circuit breaker

Technical Field

The utility model relates to a low voltage apparatus technical field, concretely relates to terminal cover structure of circuit breaker.

Background

With the continuous development of low-voltage electric appliances, the safety requirements of power grid companies on the flashover distance of the molded case circuit breaker and the line maintenance are continuously improved. However, in some high voltage and high breaking molded case circuit breaker applications, the arcing distance tends to be further than at low voltage and low breaking. The terminal cover is widely applied to the molded case circuit breaker, and can play a role in avoiding electric arc splashing and preventing mistaken touch.

The increase terminal cover on the one hand keeps apart flashover and major loop, and on the other hand can increase the distance of circuit breaker business turn over line direction, guarantees that the flashover distance is less than the height of terminal. However, the conventional terminal cover has the following problems in the case of high breaking or high voltage: 1) the electric arc splashes everywhere after passing through the terminal cover, and damages rear-end equipment; 2) the arc comes out and becomes a scattered shape, and the terminal can be burnt to damage the terminal.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's defect, provide a terminal cover structure of circuit breaker, can restrain electric arc and splash, effectively protect terminal and rear end electric appliance.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a terminal cover structure of circuit breaker, includes the fixing base and the cover body, the fixing base is installed on the casing of circuit breaker, the cover body is installed on fixing base and/or casing, the cover body forms the installation cavity with the fixing base cooperation, the fixing base is equipped with the room of putting out arc that corresponds with the utmost point of circuit breaker, the passageway shape of room for having into arc mouth and gas vent of putting out arc, it is linked together with the electric arc passageway of casing to advance the arc mouth.

Preferably, a plurality of spaced-apart arc plates are disposed within the arc-quenching chamber.

Preferably, the arc plates are parallel to the side walls of the arc chute.

Preferably, the fixed seat comprises a seat bottom plate and a seat top plate which are parallel to each other, and two seat outer side plates which are parallel to each other and connect the seat bottom plate and the seat top plate, and the arc quenching chamber is formed by separating seat middle side plates which are parallel to the seat outer side plates.

Preferably, the fixed seat further comprises a seat end side plate, the seat end side plate is arranged at one end, far away from the shell, of the arc quenching chamber, and the exhaust port is arranged on the seat end side plate.

Preferably, a cover middle side plate is arranged in the mounting cavity of the cover body, the seat middle side plate is provided with a slot corresponding to the cover middle side plate, and the lower end of the cover middle side plate extends downwards and is connected with the slot in an inserting mode.

Preferably, the slot has first draw-in groove and the second draw-in groove that is linked together, it is protruding to be equipped with two relative joints on the lateral wall of first draw-in groove, and wherein, the width that the width of first draw-in groove is greater than the width of second draw-in groove equals that the thickness of side plate in the cover equals that the interval of two joints is protruding.

Preferably, the side plates in the seats are provided with mounting columns, the outer walls of the mounting columns are connected with the adjacent side plates in the two seats, and the top ends of the mounting columns are axially provided with fixing grooves; the side plate in the cover is provided with an avoidance notch, a fixed protrusion and a connecting column in sequence corresponding to the mounting column, the avoidance notch is matched with the mounting column, the fixed protrusion is matched with the fixed groove, and the connecting column is in butt joint with the mounting column.

Preferably, a partition plate is further arranged in the arc quenching chamber, the partition plate is connected among the base bottom plate, the base top plate and the base end side plate and divides the arc quenching chamber into independent sub-chambers, and each sub-chamber is communicated with the arc channel.

Preferably, the ends of the seat middle side plate, the partition plate and the seat top plate are flush and level and abut against the side wall of the shell; the seat bottom plate is provided with an installation plate protruding out of the end part of the side plate in the seat, the installation plate of the seat bottom plate is provided with a fixing hole, and the installation plate of the seat bottom plate is attached to the bottom surface of the shell.

The terminal cover structure of the circuit breaker of the utility model designs the arc quenching chamber into a channel shape communicated with the arc channel to form a semi-closed structure, and the arc is cut and cooled by the released gas after entering, so that the arc can be efficiently quenched, and the electric appliance outside the circuit breaker is prevented from being damaged by the splashing of the arc; the arc quenching chamber is a semi-closed structure independent of the terminal mounting cavity, and meanwhile, the damage of electric arcs to the terminal is avoided; when improving circuit breaker protection level, guarantee that electric arc can not splash, separate electric arc and terminal, rear end electrical apparatus etc. effectively protect terminal and rear end electrical apparatus, reach good protecting effect.

Drawings

Fig. 1 is a schematic structural diagram of a circuit breaker according to an embodiment of the present invention;

fig. 2 is a cross-sectional view of a circuit breaker according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a circuit breaker without a cover according to an embodiment of the present invention;

FIG. 4 is a cross-sectional view of FIG. 3;

fig. 5 is a perspective view of a fixing base according to an embodiment of the present invention;

fig. 6 is a front view of the fixing base according to the embodiment of the present invention;

fig. 7 is a sectional view of a fixing base according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a cover according to an embodiment of the present invention.

Detailed Description

The following describes the specific embodiments of the terminal cover structure of the circuit breaker according to the present invention with reference to the embodiments shown in fig. 1 to 8. The terminal cover structure of the circuit breaker of the present invention is not limited to the description of the following embodiments.

As shown in fig. 1-4, the utility model discloses a terminal cover structure of circuit breaker, including fixing base 1 and the cover body 2, fixing base 1 is installed on the casing 3 of circuit breaker, the cover body 2 is installed on fixing base 1 and/or casing 3, the cover body 2 forms the installation cavity 200 that is used for installing binding post 4 and business turn over line row with the cooperation of fixing base 1, fixing base 1 is equipped with the arc-quenching room 100 that corresponds with the utmost point of circuit breaker, arc-quenching room 100 is independent of installation cavity 200, the passageway shape of arc-quenching room 100 for having into arc mouth 101 and gas vent 102, it is linked together with the arc passageway 300 of casing 3 to advance arc mouth 101. Preferably, a plurality of spaced arc plates 109 are disposed within the arc chute 100, the arc plates 109 being parallel to the side walls of the arc chute 300. The arc-extinguishing chamber 100 is made of gas-generating material, which may be PA material or the like. As shown in fig. 2 or 4, the arc is divided by the arc plates 109 after entering the arc-quenching chamber 100, and a large amount of gas is decomposed to cool the arc, so that the arc is completely quenched in the arc-quenching chamber 100, and the gas can be conducted out through the exhaust port 102. The terminal cover structure of the circuit breaker of the utility model designs the arc quenching chamber into a channel shape communicated with the arc channel to form a semi-closed structure, and the arc is cut and cooled by the released gas after entering, so that the arc can be efficiently quenched, and the electric appliance outside the circuit breaker is prevented from being damaged by the splashing of the arc; the arc quenching chamber is a semi-closed structure independent of the terminal mounting cavity, and meanwhile, the damage of electric arcs to the terminal is avoided; when improving circuit breaker protection level, guarantee that electric arc can not splash, separate electric arc and terminal, rear end electrical apparatus etc. effectively protect terminal and rear end electrical apparatus, reach good protecting effect.

As shown in fig. 5-7, the fixing base 1 of the present invention includes a base bottom plate 103 and a base top plate 104 parallel to each other, and two base outer side plates 105 connecting the base bottom plate 103 and the base top plate 104 and parallel to each other, and the arc quenching chamber 100 is formed by separating a base middle side plate 106 parallel to the base outer side plates 105.

As shown in fig. 5-7, the fixing base 1 of the present invention further includes a base end side plate 107, the base end side plate 107 is disposed at an end of the arc quenching chamber 100 away from the housing 3, and the exhaust port 102 is disposed on the base end side plate 107. As shown in fig. 7, a partition 108 is further disposed in the arc-quenching chamber 100, and the partition 108 is connected between the seat bottom plate 103, the seat top plate 104 and the seat end side plate 107 to divide the arc-quenching chamber 100 into separate sub-chambers 110, and each sub-chamber 110 is communicated with the arc channel 300. The ends of the seat middle side plate 106, the partition plate 108 and the seat top plate 104 are flush and abut against the side wall of the housing 3; the arc plates 109 are shorter than the partition 108, and the seat outer plate 105 is longer than the partition 108; the seat bottom plate 103 has an installation plate 1030 protruding from an end of the seat middle side plate 106, the installation plate 1030 of the seat bottom plate 103 is provided with a fixing hole 1031, and the installation plate 1030 is attached to the bottom surface of the housing 3.

As shown in fig. 8, a cover middle side plate 203 corresponding to the latch groove 301 of the circuit breaker is provided in the mounting cavity 200 of the cover body 2, and the cover middle side plate 203 of the cover body 2 is inserted into the latch groove 301 of the circuit breaker during mounting. The side plate 106 in the seat has a slot corresponding to the side plate 203 in the cover, and the lower end of the side plate 203 in the cover extends downward and is inserted into the slot. As shown in fig. 6 and 7, the slot has a first slot 111 and a second slot 112 that are communicated with each other, and two opposite clamping protrusions 113 are disposed on a side wall of the first slot 111, wherein a width of the first slot 111 is greater than a width of the second slot 112, and a distance between the two clamping protrusions 113 is equal to a thickness of the side plate 203 in the cover. The seat middle side plates 106 are provided with mounting columns 114, the outer walls of the mounting columns 114 are connected with the two adjacent seat middle side plates 106, and the top ends of the mounting columns 114 are axially provided with fixing grooves 115; an avoiding notch 205, a fixing protrusion 206 and a connecting column 207 are sequentially arranged on the side plate 203 in the cover corresponding to the mounting column 114, the avoiding notch 205 is matched with the mounting column 114, the fixing protrusion 206 is matched with the fixing groove 115, and the connecting column 207 is in butt joint with the mounting column 114.

In a specific embodiment, as shown in fig. 5-7, the fixing base 1 has three independent arc-quenching chambers 100 arranged in a row, and the fixing base 1 of the present embodiment includes a base bottom plate 103, three base top plates 104, two base outer side plates 105 vertically connected to the base bottom plate 103, four base middle side plates 106, and three base end side plates 107, wherein the base top plates 104 are parallel to the base bottom plate 103. The intermediate arc-chute 100 is surrounded by a seat bottom plate 103, two spaced apart seat middle side plates 106, a seat end side plate 107 connected to one end of the two seat middle side plates 106, and a seat top plate 104 connected between the two seat middle side plates 106 and the seat end side plate 107 to form a channel-shaped semi-enclosed structure. The two arc-quenching chambers 100 on both sides are surrounded by a seat bottom plate 103, a seat outer side plate 105 and a seat middle side plate 106 which are spaced apart, a seat end side plate 107 connected between the seat outer side plate 105 and the seat middle side plate 106, and a seat top plate 104 connected between the seat outer side plate 105, the seat middle side plate 106 and the seat end side plate 107, forming a channel-shaped semi-closed structure.

As shown in fig. 7, in this example, a partition 108 is provided in each arc-quenching chamber 100 to divide the single arc-quenching chamber 100 into two separate sub-chambers 110, each sub-chamber 110 being in communication with one arc channel 300. Within each compartment 110 of the arc chute 100 are two spaced-apart arc plates 109, the arc plates 109 being parallel to the partition 108 and connected between the seat bottom plate 103, the seat top plate 104 and the seat end side plate 107.

As shown in fig. 7, in this example, the arc inlet 101 is opposite to the seat end side plate 107, two exhaust ports 102 are provided on each seat end side plate 107, six exhaust ports 102 are uniformly arranged, and each sub-chamber 110 is communicated with the outside of the circuit breaker through one exhaust port 102. The exhaust port 102 is disposed opposite the arc plates 109. Further, the exhaust port 102 is a rectangular hole, the length of the exhaust port 102 is smaller than the height of the arc-extinguishing plate 109, and the width of the exhaust port 102 is larger than the thickness of the arc-extinguishing plate 109. The structural design of gas vent effectively ensures electric arc and is cut apart and discharge from the gas vent after the chamber cooling of putting out an arc through the arc-extinguishing plate again, improves arc extinguishing effect and protecting effect.

As shown in fig. 8, the cover body 2 of the present embodiment includes a cover top plate 201, two cover outer side plates 202 vertically connected to the cover top plate 201, two cover middle side plates 203, and a cover end side plate 204, the cover outer side plates 202 and the cover middle side plates 203 are arranged in parallel at intervals and connected to the cover end side plates 204 to form three independent mounting cavities 200, and each mounting cavity 200 is used for mounting one terminal 4. The bottom ends of the cover outer side plate 202 and the cover end side plate 204 are flush, and the bottom ends of the cover middle side plate 203 protrude from the bottom end of the cover end side plate 204. When the device is installed, the cover body 2 is buckled on the fixed seat 1, and the cover outer side plate 202 and the cover end side plate 204 of the cover body 2 fall on the seat top plate 104 of the fixed seat 1; the lower end extension part of the side plate 203 in the cover of the cover body 2 is inserted into the slot of the fixed base 1, the side plate 203 in the cover is limited in the second clamping groove 112 and between the two clamping protrusions 113 of the first clamping groove 111, the mounting column 114 of the fixed base 1 is clamped into the avoiding notch 205 of the cover body 2, the fixing protrusion 206 of the cover body 2 is clamped into the fixing groove 115 of the fixed base 1, and the connecting column 207 of the cover body 2 is in butt joint with the mounting column 114 of the fixed base 1. The mounting structure between the cover body and the fixing seat is simple, the cover body is convenient to mount, and the mounting is firm and reliable.

The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims

1. A terminal cover structure of a circuit breaker, characterized in that: including fixing base (1) and the cover body (2), install on casing (3) of circuit breaker fixing base (1), install on fixing base (1) and/or casing (3) cover body (2), cover body (2) and fixing base (1) cooperation form installation cavity (200), fixing base (1) is equipped with arc-quenching chamber (100) that corresponds with the utmost point of circuit breaker, arc-quenching chamber (100) is for having the passageway shape of advancing arc mouth (101) and gas vent (102), it is linked together with arc passageway (300) of casing (3) to advance arc mouth (101).

2. The terminal cover structure of a circuit breaker according to claim 1, wherein: a plurality of spaced arc plates (109) are arranged in the arc quenching chamber (100).

3. The terminal cover structure of a circuit breaker according to claim 2, wherein: the arc plates (109) are parallel to the side walls of the arc channel (300).

4. The terminal cover structure of a circuit breaker according to claim 1, wherein: the fixed seat (1) comprises a seat bottom plate (103) and a seat top plate (104) which are parallel to each other, and two seat outer side plates (105) which are connected with the seat bottom plate (103) and the seat top plate (104) and are parallel to each other, wherein the arc quenching chamber (100) is formed by separating seat middle side plates (106) which are parallel to the seat outer side plates (105).

5. The terminal cover structure of circuit breaker according to claim 4, characterized in that: the fixed seat (1) further comprises a seat end side plate (107), the seat end side plate (107) is arranged at one end, far away from the shell (3), of the arc quenching chamber (100), and the exhaust port (102) is arranged on the seat end side plate (107).

6. The terminal cover structure of circuit breaker according to claim 4, characterized in that: a cover middle side plate (203) is arranged in an installation cavity (200) of the cover body (2), the seat middle side plate (106) is provided with a slot corresponding to the cover middle side plate (203), and the lower end of the cover middle side plate (203) extends downwards and is connected with the slot in an inserting mode.

7. The terminal cover structure of circuit breaker according to claim 6, characterized in that: the slot has first draw-in groove (111) and second draw-in groove (112) that are linked together, be equipped with two relative joint archs (113) on the lateral wall of first draw-in groove (111), wherein, the width of first draw-in groove (111) is greater than the width of second draw-in groove (112) and equals the thickness that the interval of two joint archs (113) equals cover median lamella (203).

8. The terminal cover structure of circuit breaker according to claim 6, characterized in that: the seat middle side plates (106) are provided with mounting columns (114), the outer walls of the mounting columns (114) are connected with the two adjacent seat middle side plates (106), and the top ends of the mounting columns (114) are axially provided with fixing grooves (115); the cover is characterized in that an avoidance notch (205), a fixed protrusion (206) and a connecting column (207) are sequentially arranged on the side plate (203) in the cover corresponding to the mounting column (114), the avoidance notch (205) is matched with the mounting column (114), the fixed protrusion (206) is matched with the fixed groove (115), and the connecting column (207) is in butt joint with the mounting column (114).

9. The terminal cover structure of circuit breaker according to claim 5, characterized in that: still be equipped with baffle (108) in arc-quenching chamber (100), baffle (108) are connected between seat bottom plate (103), seat roof (104) and seat end curb plate (107), will arc-quenching chamber (100) separate into independent locellus (110), and every locellus (110) all are linked together with arc passageway (300).

10. The terminal cover structure of a circuit breaker according to claim 9, wherein: the ends of the seat middle side plate (106), the partition plate (108) and the seat top plate (104) are flush and are abutted with the side wall of the shell (3); the seat bottom plate (103) is provided with a mounting plate (1030) protruding out of the end part of the seat middle side plate (106), a fixing hole (1031) is formed in the mounting plate (1030) of the seat bottom plate (103), and the mounting plate (1030) of the seat bottom plate (103) is attached to the bottom surface of the shell (3).