CN212434567U - Arc extinguishing chamber for low-voltage circuit breaker - Google Patents
Arc extinguishing chamber for low-voltage circuit breaker Download PDFInfo
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- CN212434567U CN212434567U CN202021913407.0U CN202021913407U CN212434567U CN 212434567 U CN212434567 U CN 212434567U CN 202021913407 U CN202021913407 U CN 202021913407U CN 212434567 U CN212434567 U CN 212434567U
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Abstract
The utility model relates to an arc extinguish chamber for a low-voltage circuit breaker, which comprises an arc extinguish grid sheet group (15), an arc striking sheet (3), a side plate (5), a base (4), a flame extinguishing sheet (16) and a top cover (13), wherein the arc extinguish grid sheet group (15) consists of an upper arc extinguish grid sheet group (1) and a lower arc extinguish grid sheet group (2) which are parallel to each other, the lower arc extinguish grid sheet group (2) is close to a static contact region, namely an electric arc generating region, the upper arc extinguish grid sheet group (1) is arranged above the lower arc extinguish grid sheet group (2), and the included angle between a pin of the lower arc extinguish grid sheet group (2) and the horizontal direction is 35-50 degrees; the lower arc-extinguishing grid group (2) has a larger area and a smaller distance with a contact region than the upper arc-extinguishing grid group (1), wherein the area of each grid sheet in the lower arc-extinguishing grid group (2) is 2-3 cm larger than the area of each grid sheet in the upper arc-extinguishing grid group (1)2. Compared with the prior art, the utility model has the advantages of arc extinguishing performance is excellent, long service life, breaking capacity height.
Description
Technical Field
The utility model relates to a low-voltage apparatus technical field, concretely relates to explosion chamber for low-voltage circuit breaker.
Background
The low-voltage circuit breaker is an important protective electric appliance for connecting and disconnecting a line in a low-voltage distribution system, and can automatically disconnect the line when the line has overload or short-circuit faults so as to protect the line and a load from being damaged. The low-voltage circuit breaker is breaking fault current's in-process, can produce electric arc between the contact of electrical apparatus, and electric arc is a high temperature free gas, and it can cause very big damage to the contact of circuit breaker, if do not in time extinguish electric arc, can cause the damage of circuit breaker, more serious can lead to the incident. Therefore, the arc extinguish chamber is installed in the existing circuit breaker, and the arc extinguish chamber is a core component of the circuit breaker, and can divide the electric arc into a plurality of short arcs by depending on a plurality of arc extinguish grid pieces, so that the electric arc voltage is improved, and the circuit breaker is protected.
The small-shell-frame circuit breaker is a miniaturized circuit breaker with the shell frame current of 1600A, the rated current of 200-1600A and the phase distance of no more than 80 mm. In order to meet the demands of the market and customers, the breaking capacity of the small-shell-frame circuit breaker needs to be improved urgently, and one of the key points is to improve the performance of the arc extinguish chamber of the circuit breaker. Because the small-shell-frame circuit breaker has the defects of space limitation and original design, the performance of the arc extinguish chamber is very difficult to improve. Therefore, the arc extinguish chamber of the small-shell rack circuit breaker needs an all-round innovative design to effectively improve the breaking capacity of the arc extinguish chamber.
The explosion chamber structure of low voltage circuit breaker in the prior art includes: the arc extinguishing grid plate group consists of a plurality of arc extinguishing grid plates which are arranged in parallel; an arc striking plate capable of rapidly guiding an arc; the side plate is used for installing the arc extinguishing grid group and the arc striking plate; a base cooperating with the side plate; the flame extinguishing sheets are arranged above the base and are made of different materials in a stacked mode; a top cover with an air outlet hole. The existing low-voltage small-housing-frame circuit breaker has the technical problems that an electric arc moving area is difficult to control, the breaking performance of an arc extinguish chamber is poor, the arc extinguish time is long and is about 6.5-8 ms, and the service life of the arc extinguish chamber is greatly shortened.
The invention patent CN102509676B discloses an arc extinguish chamber of a frame circuit breaker, which comprises an arc isolation cover, a grid plate, an arc striking plate, a first arc isolation wall and a second arc isolation wall. In order to increase the length of the grid plate, the top of the grid plate is limited not to contact with the inner wall of the arc isolating cover, the bottom of the grid plate is limited not to contact with the inner wall of the arc striking plate, and the grid plate and the arc striking plate are arranged in a step shape along the inclined plane of the arc striking plate. After the arc extinguish chamber with the structure is adopted, the short-circuit breaking capacity of the circuit breaker is improved to 120kA from the original 80kA, but the speed of electric arcs entering the arc extinguish chamber is low, the gas circulation inside the arc extinguish chamber is poor, and the arc extinguish performance of the arc extinguish chamber is reduced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an explosion chamber for low-voltage circuit breaker in order to overcome the defect that above-mentioned prior art exists, have advantages such as arc extinguishing performance is excellent, long service life.
The purpose of the utility model can be realized through the following technical scheme: the utility model provides an explosion chamber for low-voltage circuit breaker, including arc extinguishing bars piece group, the arc striking piece, the curb plate, a pedestal, the flame extinction piece and top cap, arc extinguishing bars piece group comprises upper arc extinguishing bars piece group and lower arc extinguishing bars piece group that are parallel to each other, lower arc extinguishing bars piece group is close to the static contact region and is the electric arc production region, upper arc extinguishing bars piece group sets up in arc extinguishing bars piece group top down, the pin of lower arc extinguishing bars piece group is 35 ~ 50 with the contained angle of horizontal direction, this kind of structure can improve the magnetic field distribution of lower arc extinguishing bars piece group, improve the magnetism of its both sides magnetic pole, increase the magnetic blow-out force of arc extinguishing bars piece to electric arc, in order to improve the speed that electric arc.
The lower arc-extinguishing grid group has a larger area and a smaller distance with a contact region than the upper arc-extinguishing grid group, wherein the area of each grid sheet in the lower arc-extinguishing grid group is 2-3 cm larger than that of each grid sheet in the upper arc-extinguishing grid group2. Because the area of arc extinguishing bars piece is bigger down, therefore the thermal capacity of arc extinguishing bars piece is higher down, and the magnetic field force of attracting electric arc is stronger, and arc extinguishing bars piece is closer with the contact region down, consequently can improve the speed that electric arc got into the explosion chamber, shortens the time of arcing.
The ratio X/Y of the width X of all the arc extinguishing grid pieces of the arc extinguishing grid piece group to the width Y of the arc striking angle of the movable contact piece is set to be 0.5-0.6. The movable contact piece is in a Venturi nozzle type, the movable contact piece is a key component of a movable contact system of the low-voltage circuit breaker, electric arcs can be generated between the movable contact piece and a fixed contact in the process of breaking fault currents, and the electric arcs are led into an arc extinguish chamber through an arc striking angle. The X/Y is set to be 0.5-0.6, the Venturi effect can be applied, the aerodynamic force of high-temperature free gas is improved, and electric arcs are pushed to the arc extinguishing chamber more quickly, so that the arc extinguishing performance is improved.
Lower arc extinguishing bars group and base between be provided with the air gap, the air gap size is 1 ~ 2mm, just the top cap install gas outlet, the existence of 1 ~ 2 mm's air gap can guide partly to disappear the free gas and reentry the electric arc region of explosion chamber, improves the regional dielectric strength of electric arc, and then improves the inside gas circulation of explosion chamber.
The upper arc-extinguishing grid group, the lower arc-extinguishing grid group and the arc striking plate are all riveted on the side plate, so that the connection strength is stable and reliable.
The arc striking piece is provided with the supporting legs in the department of bending, the supporting legs imbeds the support hole that sets up on the curb plate in order to support the arc striking piece to the magnetic field force that makes its deformation that the arc striking piece received at the circuit breaker breaking process is resisted, the life of explosion chamber is improved.
The side plate is riveted with an insulating liner, the side plate is attached to the outline dimension of the pin part of the arc-extinguishing grid plate, and the pin part of the arc-extinguishing grid plate is completely covered, so that the pin part of the arc-extinguishing grid plate is protected from being damaged by electric arc, and the service life of the arc-extinguishing chamber is prolonged. Meanwhile, the specially-made insulating liner can limit the movement space of the electric arc and guide the electric arc to enter the arc extinguishing grid group more quickly, so that the performance of the arc extinguishing chamber is improved.
The insulating liner material can release gas at high temperature, and the extra released gas can improve the medium strength in the arc extinguish chamber, increase the flow velocity of air and push the electric arc to the arc extinguish area of the arc extinguish chamber. The material is preferably polyisophthaloyl metaphenylene diamine, which has the advantages of high strength, friction resistance, radiation resistance, high temperature resistance and the like.
The side plate is preferably made of melamine resin laminated plate, and compared with the materials used in the prior art, such as a red vulcanized fiber board, the side plate has better flame resistance, arc resistance and insulating property and is not easy to carbonize in a high-temperature environment. In addition, the surface layer of the melamine resin pressing plate is smooth, the capillary holes are small, and metal ions generated in the breaking process are not easy to adsorb. After the circuit breaker is subjected to a single large short-circuit current breaking process, the arc extinguish chamber made of the melamine resin laminated plate material has higher insulating strength, and the service life of the arc extinguish chamber is prolonged.
The base top be provided with the flame suppression piece of different materials that pile up layer upon layer, according to from the supreme order down be porous flame suppression piece of small aperture, return font liner, the porous flame suppression piece of large aperture, the single-layer stainless steel mesh grid filter piece of small mesh number and the multilayer stainless steel mesh grid filter piece group of big mesh number in proper order. The arrangement sequence of the flame extinguishing sheets can utilize the change of the aperture and the porosity to form the pressure difference of the upper space and the lower space, thereby preventing the gas from flowing back to block the gas circulation at the lower part of the arc extinguish chamber. The design positions of the small-aperture porous flame suppression sheet and the large-aperture porous flame suppression sheet are staggered, the length of the air passage can be increased to the maximum extent, and the gas cooling is accelerated. The multilayer stainless steel woven mesh filter disc group with large mesh number can completely absorb the residual energy of electric arc, and the requirement of zero flashover is ensured.
Furthermore, a plurality of small holes with the diameter of 2-3 mm are formed in the small-aperture porous flame-extinguishing sheet, and the porosity is 15-25%;
the large-aperture porous flame suppression sheet is provided with a plurality of large apertures with the diameter of 2.5-3.5 mm, and the porosity is 25-35%;
the mesh number of the single-layer stainless steel woven mesh filter disc is 10-20;
the large-mesh multi-layer stainless steel woven mesh filter set is manufactured by pressing and sintering three layers of stainless steel woven mesh filter pieces with meshes of 140-200 and different meshes.
Compared with the prior art, the utility model has the advantages of it is following:
1. the arc extinguishing performance is excellent: the utility model discloses a lower arc extinguishing bars group has bigger area and less distance with the contact region than last arc extinguishing bars group, has strengthened the thermal capacity of lower arc extinguishing bars group and has attracted the magnetic field force of electric arc, has improved the speed that electric arc got into the explosion chamber, shortens the time of arcing, sets up 35 ~ 50 through the pin of lower arc extinguishing bars group and the contained angle of horizontal direction simultaneously, further improves the magnetic field distribution of lower arc extinguishing bars group, improves the speed that electric arc got into the explosion chamber; the ratio X/Y of the width X of the arc extinguishing grid piece to the arc striking angle width Y of the movable contact piece is set to be 0.5-0.6, the Venturi effect is applied, the aerodynamic force of high-temperature free gas is improved, electric arcs are pushed to the arc extinguishing chamber more quickly, the speed can be improved by 10-20% compared with the original structure, the arc burning time can be shortened to 5-6 ms from 6-8 ms, and the arc extinguishing performance of the arc extinguishing chamber is greatly improved through the technical key points;
2. the service life is long: the utility model discloses set up the supporting legs in the tab bend, can resist the magnetic field force that makes its deformation that the tab received at the circuit breaker breaking process, the riveting has insulating liner on the curb plate of explosion chamber, can protect the pin part of arc extinguishing bars piece not damaged by electric arc, and simultaneously, the curb plate of explosion chamber is preferred material melamine resin laminated board, possess good flame resistance, arc resistance and insulating nature, difficult carbonization under high temperature, and can improve explosion chamber dielectric strength, promote to 30 megaohms and above by 0 ~ 5 megaohms after original test, above technical essential all is favorable to the extension of explosion chamber life-span;
3. the breaking capacity is high: the movement space of electric arc is limited through the insulating liner, the electric arc is guided to enter the arc extinguishing grid group more quickly, the electric arc is controlled in the arc extinguishing chamber, meanwhile, air gaps are formed between the lower arc extinguishing grid group and the base, gas circulation inside the arc extinguishing chamber is improved, the medium strength in the arc extinguishing chamber and the insulation strength after a test are improved, and the breaking capacity of the arc extinguishing chamber is improved.
Drawings
Fig. 1 is a cross-sectional view of an arc extinguishing chamber for a low-voltage circuit breaker according to the present invention;
fig. 2 is a schematic structural diagram of an arc extinguish chamber for a low-voltage circuit breaker;
fig. 3 is an exploded view of the arc extinguishing chamber for the low voltage circuit breaker of the present invention;
FIG. 4 is a schematic view of the interaction of the moving contact system with the arc chute;
in the figure: 1-upper arc-extinguishing grid group, 2-lower arc-extinguishing grid group, 3-arc striking plate, 4-base, 5-side plate, 6-supporting foot, 7-insulating liner, 8-small-aperture porous flame-extinguishing plate, 9-square liner, 10-large-aperture porous flame-extinguishing plate, 11-single-layer stainless steel woven mesh filter plate, 12-multilayer stainless steel woven mesh filter plate group, 13-top cover, 14-air gap, 15-arc-extinguishing grid group and 16-flame-extinguishing plate.
Detailed Description
In order to make the technical essence and the advantageous effects of the present invention more clearly understood by examiners, especially by the public, the present invention will be described in detail with reference to the accompanying drawings and specific examples, but the description of the examples is not intended to limit the technical solution of the present invention, and any equivalent exchange made according to the inventive concept, which is only formal and insubstantial, should be considered as the technical solution of the present invention.
Example 1
As shown in fig. 1 to 2, an arc extinguish chamber for a low-voltage circuit breaker includes an arc extinguish grid set 15, an arc striking plate 3, a side plate 5, a base 4, a flame extinguish plate 16 and a top cover 13, wherein the arc extinguish grid set 15 is composed of an upper arc extinguish grid set 1 and a lower arc extinguish grid set 2 which are parallel to each other, the lower arc extinguish grid set 2 is close to a static contact region, namely an arc generation region, the upper arc extinguish grid set 1 is arranged above the lower arc extinguish grid set 2, and an included angle between a pin of the lower arc extinguish grid set 2 and a horizontal direction is 35 to 50 degrees.
As shown in fig. 1, the lower arc-extinguishing grid group 2 has a larger area and a smaller distance from the contact area than the upper arc-extinguishing grid group 1, wherein the area of each grid in the lower arc-extinguishing grid group 2 is 2cm larger than that of each grid in the upper arc-extinguishing grid group 12。
As shown in fig. 4, the ratio X/Y of the width X of all the arc chute plates of the arc chute plate group 15 to the arc striking angle width Y of the movable contact blade is set to 0.5.
An air gap 14 is arranged between the lower arc-extinguishing grid group 2 and the base 4, the size of the air gap 14 is 2mm, and a gas outlet is arranged on the top cover 13.
The upper arc-extinguishing grid group 1, the lower arc-extinguishing grid group 2 and the arc striking plate 3 are all riveted on the side plate 5.
As shown in fig. 2, the arc sheet 3 is provided with a support leg 6 at a bent position, and the support leg 6 is embedded into a support hole provided on the side plate 5 to support the arc sheet 3.
As shown in fig. 3, the side plate 5 is riveted with an insulating liner 7, the insulating liner is in accordance with the external dimension of the pin part of the arc-extinguishing grid plate to completely cover the pin part of the arc-extinguishing grid plate, the insulating liner 7 is made of polyisophthaloyl metaphenylene diamine and can release gas at high temperature, and the side plate 5 is made of melamine resin laminated plate.
As shown in fig. 3, a flame-extinguishing sheet 16 made of different materials is arranged above the base 4, and sequentially comprises a small-aperture porous flame-extinguishing sheet 8, a square-shaped liner 9, a large-aperture porous flame-extinguishing sheet 10, a small-mesh single-layer stainless steel woven mesh filter sheet 11 and a large-mesh multi-layer stainless steel woven mesh filter sheet group 12 from bottom to top.
Wherein, the porous flame-extinguishing sheet 8 with small aperture is provided with a plurality of small apertures with the diameter of 2mm, and the porosity is 15%;
the large-aperture porous flame suppression sheet 10 is provided with a plurality of large apertures with the diameter of 2.5mm, and the porosity is 25%;
the mesh number of the single-layer stainless steel woven mesh filter disc 11 is 10;
the multilayer stainless steel woven mesh filter set 12 with a large mesh number is made by pressing and sintering three layers of stainless steel woven mesh filter sheets with different mesh numbers of 140-200.
Example 2
The utility model provides an explosion chamber for low-voltage circuit breaker, includes arc extinguishing grid group 15, arc striking piece 3, curb plate 5, base 4, flame extinguishing piece 16 and top cap 13, arc extinguishing grid group 15 comprises upper arc extinguishing grid group 1 and lower arc extinguishing grid group 2 that are parallel to each other, and lower arc extinguishing grid group 2 is close to the static contact region and is the electric arc production region, and upper arc extinguishing grid group 1 sets up under in arc extinguishing grid group 2 top, and the pin of lower arc extinguishing grid group 2 is 35 ~ 50 with the contained angle of horizontal direction.
The lower arc-extinguishing grid group 2 has larger area than the upper arc-extinguishing grid group 1 and has contact area with the contactThe distance between the two adjacent grid plates is smaller, wherein the area of each grid plate in the lower arc-extinguishing grid plate group 2 is 2.5cm larger than that of each grid plate in the upper arc-extinguishing grid plate group 12。
The ratio X/Y of the width X of all the arc-extinguishing grid pieces of the arc-extinguishing grid piece group 15 to the arc striking angle width Y of the movable contact piece is set to be 0.6.
An air gap 14 is arranged between the lower arc-extinguishing grid group 2 and the base 4, the size of the air gap 14 is 1mm, and a gas outlet is arranged on the top cover 13.
The upper arc-extinguishing grid group 1, the lower arc-extinguishing grid group 2 and the arc striking plate 3 are all riveted on the side plate 5.
The arc striking piece 3 is provided with a supporting leg 6 at the bending position, and the supporting leg 6 is embedded into a supporting hole arranged on the side plate 5 to support the arc striking piece 3.
An insulating liner 7 is riveted on the side plate 5 and is attached to the outline dimension of the pin part of the arc-extinguishing grid plate to completely cover the pin part of the arc-extinguishing grid plate, the insulating liner 7 is made of polyisophthaloyl metaphenylene diamine and can release gas at high temperature, and the side plate 5 is made of a melamine resin laminated plate.
The flame-extinguishing sheets 16 made of different materials are stacked layer by layer above the base 4, and sequentially comprise a small-aperture porous flame-extinguishing sheet 8, a square-shaped liner 9, a large-aperture porous flame-extinguishing sheet 10, a small-mesh single-layer stainless steel woven mesh filter sheet 11 and a large-mesh multi-layer stainless steel woven mesh filter sheet group 12 from bottom to top.
Wherein, the porous flame-extinguishing sheet 8 with small aperture is provided with a plurality of small apertures with the diameter of 2.5mm, and the porosity is 20%;
the large-aperture porous flame suppression sheet 10 is provided with a plurality of large apertures with the diameter of 3mm, and the porosity is 30%;
the mesh number of the single-layer stainless steel woven mesh filter disc 11 is 15;
the multilayer stainless steel woven mesh filter set 12 with a large mesh number is made by pressing and sintering three layers of stainless steel woven mesh filter sheets with different mesh numbers of 140-200.
Example 3
The utility model provides an explosion chamber for low-voltage circuit breaker, includes arc extinguishing grid group 15, arc striking piece 3, curb plate 5, base 4, flame extinguishing piece 16 and top cap 13, arc extinguishing grid group 15 comprises upper arc extinguishing grid group 1 and lower arc extinguishing grid group 2 that are parallel to each other, and lower arc extinguishing grid group 2 is close to the static contact region and is the electric arc production region, and upper arc extinguishing grid group 1 sets up under in arc extinguishing grid group 2 top, and the pin of lower arc extinguishing grid group 2 is 35 ~ 50 with the contained angle of horizontal direction.
The lower arc-extinguishing grid group 2 has a larger area and a smaller distance from the contact area than the upper arc-extinguishing grid group 1, wherein the area of each grid sheet in the lower arc-extinguishing grid group 2 is 3cm larger than that of each grid sheet in the upper arc-extinguishing grid group 12。
The ratio X/Y of the width X of all the arc-extinguishing grid pieces of the arc-extinguishing grid piece group 15 to the arc striking angle width Y of the movable contact piece is set to be 0.55.
An air gap 14 is arranged between the lower arc-extinguishing grid group 2 and the base 4, the size of the air gap 14 is 1.5mm, and a gas outlet is arranged on the top cover 13.
The upper arc-extinguishing grid group 1, the lower arc-extinguishing grid group 2 and the arc striking plate 3 are all riveted on the side plate 5.
The arc striking piece 3 is provided with a supporting leg 6 at the bending position, and the supporting leg 6 is embedded into a supporting hole arranged on the side plate 5 to support the arc striking piece 3.
An insulating liner 7 is riveted on the side plate 5 and is attached to the outline dimension of the pin part of the arc-extinguishing grid plate to completely cover the pin part of the arc-extinguishing grid plate, the insulating liner 7 is made of polyisophthaloyl metaphenylene diamine and can release gas at high temperature, and the side plate 5 is made of a melamine resin laminated plate.
The flame-extinguishing sheets 16 made of different materials are stacked layer by layer above the base 4, and sequentially comprise a small-aperture porous flame-extinguishing sheet 8, a square-shaped liner 9, a large-aperture porous flame-extinguishing sheet 10, a small-mesh single-layer stainless steel woven mesh filter sheet 11 and a large-mesh multi-layer stainless steel woven mesh filter sheet group 12 from bottom to top.
Wherein, the porous flame-extinguishing sheet 8 with small aperture is provided with a plurality of small apertures with the diameter of 2.5mm, and the porosity is 25%;
the large-aperture porous flame suppression sheet 10 is provided with a plurality of large apertures with the diameter of 3.5mm, and the porosity is 35%;
the mesh number of the single-layer stainless steel woven mesh filter disc 11 is 20;
the multilayer stainless steel woven mesh filter set 12 with a large mesh number is made by pressing and sintering three layers of stainless steel woven mesh filter sheets with different mesh numbers of 140-200.
In embodiments 1 to 3, the lower arc-extinguishing grid set 2 has a larger area and a smaller distance from the contact area than the upper arc-extinguishing grid set 1, so that the thermal capacity of the lower arc-extinguishing grid set 2 and the magnetic field force for attracting the electric arc are enhanced, the speed of the electric arc entering the arc-extinguishing chamber is increased, the arc-burning time is shortened, and meanwhile, the included angle between the pin of the lower arc-extinguishing grid set 2 and the horizontal direction is set to be 35 to 50 degrees, so that the magnetic field distribution of the lower arc-extinguishing grid set 2 is further improved, and the speed of the electric arc entering the arc-extinguishing chamber; the proportion X/Y of the width X of the arc extinguishing grid piece and the arc striking angle width Y of the movable contact piece is set to be 0.5-0.6, the Venturi effect is applied, aerodynamic force of high-temperature free gas is improved, electric arc is pushed to the arc extinguishing chamber more quickly, and arc extinguishing performance of the arc extinguishing chamber is greatly improved.
Simultaneously, through the motion space of insulating liner 7 restriction electric arc, the faster entering arc extinguishing bars group 15 of guide electric arc is in the arc extinguish chamber, through setting up the air gap between arc extinguishing bars group 2 and base 4 under simultaneously, has improved the inside gas circulation of explosion chamber, is favorable to improving the medium intensity in the arc extinguish chamber, prevents the free gas reflux of high temperature, has improved the breaking capacity of explosion chamber.
Finally, it sets up supporting legs 6 to bend the department at run-on piece 3, can resist the magnetic field force that the run-on piece 3 made its deformation that the breaking process of circuit breaker received, the riveting has insulating liner 7 on 5 of curb plate of explosion chamber, the pin part that can protect the arc extinguishing bars piece does not receive the damage of electric arc, and simultaneously, 5 material melamine resin laminated plates of curb plate of explosion chamber, possess good flame resistance, arc resistance and insulating nature, difficult carbonization under high temperature, and can improve explosion chamber dielectric strength, show extension explosion chamber life-span.
Compared with the existing products, the arc burning time can be shortened from 6.5-8 ms to 5-6 ms in the embodiments 1-3, the rated limit short circuit breaking capacity Icu under the condition of alternating current 400V is improved from 65kA to 70kA, the rated operation short circuit breaking capacity Ics is improved from 55kA to 66kA, the insulation performance of the arc extinguish chamber after the test is improved from 0-5 megaohms to 30 megaohms and above, and the technical index reaches the leading level of the industry.
Claims (10)
1. The utility model provides an explosion chamber for low-voltage circuit breaker, including arc extinguishing grid piece group (15), arc striking piece (3), curb plate (5), base (4), flame extinction piece (16) and top cap (13), a serial communication port, arc extinguishing grid piece group (15) comprises last arc extinguishing grid piece group (1) and lower arc extinguishing grid piece group (2) that are parallel to each other, lower arc extinguishing grid piece group (2) are close to the static contact region and are electric arc production region, go up arc extinguishing grid piece group (1) and set up arc extinguishing grid piece group (2) top down, the pin of lower arc extinguishing grid piece group (2) is 35 ~ 50 with the contained angle of horizontal direction.
2. Arc chute for low-voltage circuit breaker according to claim 1, characterized in that said lower group of quenching bars (2) has a larger area and a smaller distance from the contact area than the upper group of quenching bars (1), wherein the area of each bar in the lower group of quenching bars (2) is 2-3 cm larger than the area of each bar in the upper group of quenching bars (1)2。
3. Arc chute for low-voltage circuit breakers according to claim 1, characterized in that the ratio X/Y of the width X of all the arc chute blades of said group (15) to the striking angle width Y of the moving contact blade is set to be 0.5 to 0.6.
4. An arc chute for a low-voltage circuit breaker according to claim 1, characterized in that an air gap (14) is arranged between the lower arc chute group (2) and the base (4), the size of the air gap (14) is 1-2 mm, and the top cover (13) is provided with a gas outlet.
5. Arc chute for low-voltage circuit breakers as claimed in claim 1, characterized in that said upper (1), lower (2) and striking plate (3) are all mounted on the side plates (5);
the arc striking piece (3) is provided with a supporting leg (6) at the bending part, and the supporting leg (6) is embedded into a supporting hole arranged on the side plate (5) to support the arc striking piece (3).
6. Arc chute for low-voltage circuit breakers as claimed in claim 1, characterized in that said side plates (5) are riveted with insulating gaskets (7) conforming to the external dimensions of the leg portions of the arc chute blades, completely covering them.
7. Arc chute for low-voltage circuit breakers as claimed in claim 6, characterized in that said insulating gasket (7) material is polyisophthaloyl metaphenylene diamine;
the side plate (5) is made of melamine resin laminated plate.
8. Arc extinguish chamber for low-voltage circuit breaker according to claim 1, characterized in that flame-out sheets (16) of different materials are arranged above the base (4) in a layer-by-layer manner, and are a porous flame-out sheet (8) with small aperture, a zigzag-shaped liner (9), a porous flame-out sheet (10) with large aperture, a single-layer stainless steel woven mesh filter (11) with small mesh and a multi-layer stainless steel woven mesh filter (12) with large mesh in sequence from bottom to top.
9. The arc extinguish chamber for the low-voltage circuit breaker according to claim 8, wherein a plurality of small holes with the diameter of 2-3 mm are arranged on the small-hole-diameter porous flame-extinguishing sheet (8), and the porosity is 15-25%;
the large-aperture porous flame suppression sheet (10) is provided with a plurality of large apertures with the diameter of 2.5-3.5 mm, and the porosity is 25-35%.
10. Arc chute for low-voltage circuit breakers according to claim 8, characterized in that said single layer of stainless steel mesh grid filter (11) has a mesh number of 10 to 20;
the mesh number of the large-mesh multi-layer stainless steel woven mesh filter plate group (12) is 140-200, and the number of layers is three.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021913407.0U CN212434567U (en) | 2020-09-04 | 2020-09-04 | Arc extinguishing chamber for low-voltage circuit breaker |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021913407.0U CN212434567U (en) | 2020-09-04 | 2020-09-04 | Arc extinguishing chamber for low-voltage circuit breaker |
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| CN212434567U true CN212434567U (en) | 2021-01-29 |
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