Molded case circuit breaker

Abstract

The utility model belongs to the technical field of low-voltage electric appliances, and discloses a molded case circuit breaker. The molded case circuit breaker comprises a middle cover and an arc extinguishing system. The middle cover is provided with a first gas baffle plate; the arc extinguishing system comprises an arc extinguishing chamber and a flash barrier, the flash barrier comprises a flash barrier body and an inclined part, the flash barrier body is arranged on the arc extinguishing chamber, the inclined part is connected to the flash barrier body in a bent mode, the middle cover is arranged on the flash barrier in a covering mode, and the inclined part and the first gas baffle are matched with each other to form a blocking structure. According to the molded case circuit breaker, gas in the arc extinguish chamber can be prevented from being sprayed to the rear end of the arc extinguish chamber in the breaking process of the molded case circuit breaker through the blocking effect of mutual cross cooperation between the first gas baffle plate and the inclined piece, and the phenomenon that the molded case circuit breaker is sprayed after being broken is effectively reduced; therefore, breaking gas is prevented from entering the operating mechanism at the rear end of the arc extinguish chamber, and the reliability of the switching-off and switching-on functions of the molded case circuit breaker can be ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to low voltage electrical apparatus technical field especially relates to moulded case circuit breaker. BACKGROUND

[0002] In the breaking process of the moulded case circuit breaker, that is, in the process of the moving contact and the static contact of the moulded case circuit breaker being separated, the gas in the arc extinguishing chamber is easy to be injected to the rear end of the arc extinguishing chamber, which makes the post-breaking injection phenomenon of the moulded case circuit breaker more serious, thereby affecting the operating mechanism located at the rear end of the arc extinguishing chamber and failing to guarantee the reliability of the opening and closing functions of the moulded case circuit breaker.

[0003] Therefore, there is an urgent need for a moulded case circuit breaker to solve the above problems. SUMMARY

[0004] The utility model discloses a kind of moulded case circuit breakers, can effectively reduce the post-breaking injection phenomenon of moulded case circuit breaker, to guarantee the reliability of the opening and closing functions of moulded case circuit breaker.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] Moulded case circuit breaker, comprising:

[0007] Middle cover, the middle cover is provided with first gas baffle;

[0008] Arc extinguishing system, including arc extinguishing chamber and arc separation plate, the arc separation plate includes arc separation main body and inclined piece, the arc separation main body is arranged on the arc extinguishing chamber, the inclined piece is bently connected to the arc separation main body, the middle cover is covered on the arc separation plate, the inclined piece and the first gas baffle are mutually cooperated to form blocking structure.

[0009] As optional scheme, the inclined piece includes first inclined plate, the first inclined plate and the first gas baffle are mutually cooperated to form the blocking structure;The arc separation main body includes:

[0010] Flat plate, the first inclined plate is obliquely connected to one end of the flat plate;

[0011] Two limit support plates, two limit support plates are placed on the two sides of the first inclined plate, one end of the limit support plate is connected with one end of the flat plate, the other end of the limit support plate is connected with the arc extinguishing chamber, and the limit support plate is lapped on the first gas baffle;

[0012] Connecting plate, one end of the connecting plate is connected with the other end of the flat plate, the connecting plate is arranged at an angle with the flat plate, and the connecting plate is connected with the arc extinguishing chamber.

[0013] As an option, the inclined member comprises a second inclined plate, the second inclined plate is overlapped on the first gas baffle, and the second inclined plate and the first gas baffle cooperatively form the blocking structure; the arc separation body comprises:

[0014] A first shielding plate, one end of the first shielding plate is foldably connected with the second inclined plate, and the first shielding plate and the second inclined plate are respectively arranged on a part of the top end of the arc extinguishing chamber;

[0015] A plug-in plate connected to the other end of the first shielding plate;

[0016] A second shielding plate, the opposite sides of the first shielding plate and the second inclined plate are respectively connected with the second shielding plate, and the second shielding plate is arranged on the top end of another part of the arc extinguishing chamber.

[0017] As an option, the second inclined plate is provided with an abutting table near one side of the arc extinguishing chamber.

[0018] As an option, the arc extinguishing system further comprises a reflection plate, the reflection plate comprises:

[0019] A reflection main plate, the arc extinguishing chamber is arranged on the reflection main plate, the reflection main plate is provided with a first plug-in slot, the other end of the connecting plate is provided with a first plug-in piece, and the first plug-in piece is plugged into the first plug-in slot;

[0020] Two baffle plates arranged near the first plug-in slot, the two baffle plates are oppositely connected to the reflection main plate along the Y axis, and the two baffle plates are respectively located in the arc extinguishing chamber, and the distance between the two baffle plates gradually increases in the direction along the X axis and close to the center of the arc extinguishing chamber.

[0021] As an option, the molded case circuit breaker further comprises a base, the middle cover is arranged on the base to form a mounting space, and the arc extinguishing system is arranged in the mounting space;

[0022] The two ends of the middle cover along the X axis are respectively provided with three accommodating cavities, and the three accommodating cavities at each end are arranged along the Y axis, wherein the three accommodating cavities at one end are respectively provided with second plug-in pieces, and the middle cover is provided with at least two third plug-in pieces, the at least two third plug-in pieces are arranged between the accommodating cavities at the two ends of the middle cover along the X axis and are arranged on the two sides of the accommodating cavities in the middle along the Y axis.

[0023] The base is provided with a plurality of second plug-in slots and a plurality of third plug-in slots, the second plug-in pieces are plugged into the corresponding second plug-in slots, and the third plug-in pieces are plugged into the corresponding third plug-in slots.

[0024] As an option, the middle cover is provided with a second gas baffle and a third gas baffle outside the third insertion piece respectively, the second gas baffle and the third gas baffle extend along the Y axis respectively, and the second gas baffle and the third gas baffle are arranged along the X axis.

[0025] As an option, the molded case circuit breaker further comprises a contact system, the contact system comprises:

[0026] The static contact comprises a base plate and a bent plate, one end of the bent plate is connected to the base plate, and the other end of the bent plate is spaced above the base plate, and the base plate and the bent plate are arranged below the arc extinguishing chamber respectively.

[0027] As an option, the contact system further comprises:

[0028] The movable contact can be rotated to abut or be separated from the static contact, and the movable contact is provided with at least two heat dissipation through holes.

[0029] As an option, the molded case circuit breaker further comprises a conductive system, the conductive system comprises:

[0030] The thermal element is connected with the movable contact, one of the thermal element and the connecting plate is provided with a notch groove, and the other is provided with a protrusion, and the protrusion and the notch groove are matched and positioned.

[0031] Advantages:

[0032] The molded case circuit breaker provided by the utility model, through setting the first gas baffle on the middle cover, the arc extinguishing system comprises an arc extinguishing chamber and an arc separation plate, the arc separation plate comprises an arc separation main body and an inclined piece, the arc separation main body is arranged on the arc extinguishing chamber, and the inclined piece is bently connected to the arc separation main body; when the middle cover is arranged on the arc separation plate, the inclined piece and the first gas baffle are matched to form a blocking structure, so that the blocking effect of the blocking structure can prevent the gas in the arc extinguishing chamber from spraying to the rear end of the arc extinguishing chamber during the breaking process of the molded case circuit breaker, effectively reduces the post-breaking spraying phenomenon of the molded case circuit breaker, thereby avoiding the breaking gas from entering the operating mechanism arranged at the rear end of the arc extinguishing chamber, and further ensuring the reliability of the breaking and closing functions of the molded case circuit breaker. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is a structural schematic view of the arc extinguishing system provided in the utility model embodiment one;

[0034] Figure 2 is an assembly structure schematic view between the bottom end surface of the middle cover and the arc separation plate provided in the utility model embodiment one;

[0035] Figure 3 isFigure 2 A local enlarged structure schematic view at the middle A;

[0036] Figure 4 A structure schematic view of the arc-extinguishing chamber provided in the embodiment one of the utility model;

[0037] Figure 5 A structure schematic view of the arc separation plate provided in the embodiment one of the utility model;

[0038] Figure 6 A structure schematic view of the reflection plate provided in the embodiment one of the utility model;

[0039] Figure 7 A structure schematic view of the base provided in the embodiment one of the utility model;

[0040] Figure 8 A structure schematic view of the static contact provided in the embodiment one of the utility model;

[0041] Figure 9 A structure schematic view of the dynamic contact provided in the embodiment one of the utility model;

[0042] Figure 10 An assembly structure schematic view between the thermal element and the connecting plate provided in the embodiment one of the utility model;

[0043] Figure 11 An assembly structure schematic view between the arc-extinguishing chamber and the arc separation plate provided in the embodiment two of the utility model;

[0044] Figure 12 A structure schematic view of the arc separation plate provided in the embodiment two of the utility model;

[0045] Figure 13 A sectional view of the arc separation plate provided in the embodiment two of the utility model.

[0046] In the drawing:

[0047] 1, middle cover; 11, first air baffle; 12, second insertion piece; 13, third insertion piece; 141, second air baffle; 142, third air baffle; 15, accommodating cavity;

[0048] 2, arc-extinguishing system; 21, arc-extinguishing chamber; 211, clamping hole; 212, slot; 22, arc separation plate; 2211, flat plate; 2212, limiting support plate; 2213, connecting plate; 2214, first insertion piece; 2215, first clamping convex; 2216, second clamping convex; 222, first inclined plate; 231, reflection main plate; 2311, first insertion slot; 232, baffle;

[0049] 2231, first shielding plate; 2232, plug-in plate; 2233, second shielding plate; 2234, abutment platform; 224, second inclined plate;

[0050] 4. Base; 41. Second plug-in slot; 42. Third plug-in slot;

[0051] 51, static contact; 511, mounting hole; 512, base plate; 513, bending plate; 52, moving contact; 521, heat dissipation hole;

[0052] 61. Thermal element; 611. Notch; 62. Connecting plate; 621. Protrusion. DETAILED DESCRIPTION

[0053] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0054] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0055] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0056] In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like, orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0057] Embodiment one

[0058] The plastic shell circuit breaker proposed in the present embodiment can effectively prevent the breaking gas from being sprayed to the rear end of the plastic shell circuit breaker during the breaking process, effectively reduce the post-breaking spray phenomenon of the plastic shell circuit breaker, and thus can ensure the reliability of the breaking and closing functions of the plastic shell circuit breaker.

[0059] Specifically, as shown in the drawings, Figures 1 to 3 The plastic shell circuit breaker includes a middle cover 1 and an arc extinguishing system 2; a first gas baffle 11 is arranged on one side of the middle cover 1 facing the arc extinguishing system 2; the arc extinguishing system 2 includes an arc extinguishing chamber 21 and an arc separation plate 22, the arc separation plate 22 includes an arc separation main body and an inclined piece, the arc separation main body is arranged on the arc extinguishing chamber 21, the inclined piece is bent and connected to the arc separation main body, the middle cover 1 is arranged on the arc separation plate 22, and the inclined piece and the first gas baffle 11 cooperate to form a blocking structure.

[0060] The plastic shell circuit breaker in the present embodiment adds the first gas baffle 11 and the inclined piece that cooperate to form a blocking structure compared with the prior art; by arranging the first gas baffle 11 on the middle cover 1, the arc extinguishing system 2 includes the arc extinguishing chamber 21 and the arc separation plate 22, the arc separation plate 22 includes the arc separation main body and the inclined piece, the arc separation main body is arranged on the arc extinguishing chamber 21, and the inclined piece is bent and connected to the arc separation main body; when the middle cover 1 is arranged on the arc separation plate 22, the inclined piece and the first gas baffle 11 cooperate to form a blocking structure, so that the breaking gas in the arc extinguishing chamber 21 of the plastic shell circuit breaker can be prevented from being sprayed to the rear end of the arc extinguishing chamber 21 during the breaking process by the blocking effect of the formed blocking structure, the post-breaking spray phenomenon of the plastic shell circuit breaker is effectively reduced, the breaking gas is prevented from entering the operating mechanism located at the rear end of the arc extinguishing chamber 21, and thus the reliability of the breaking and closing functions of the plastic shell circuit breaker can be ensured. The rear end referred to in the present embodiment specifically refers to the part located at the rear side of the arc extinguishing chamber 21 with the arc extinguishing chamber 21 as the front end reference.

[0061] It is worth noting that the operating mechanism, the arc extinguishing chamber 21 and the arc separation plate 22 described above are all common structures in existing plastic shell circuit breakers, and the working principles of the operating mechanism, the arc extinguishing chamber 21 and the arc separation plate 22 will not be described in detail here, and reference can be made to the existing plastic shell circuit breaker.

[0062] Further, as shown in the drawings,Figure 1 、 Figure 4 and Figure 5 As shown in

[0063] Specifically, as shown in Figure 1 、 Figure 4 and Figure 5 , the other end of the limiting support plate 2212 is connected to the arc-extinguishing chamber 21, which specifically means that a first clamping protrusion 2215 is protruded on each of the two limiting support plates 2212, and the arc-extinguishing chamber 21 is provided with two clamping holes 211 arranged opposite along the Y-axis, one first clamping protrusion 2215 can be assembled and positioned into one clamping hole 211 to realize the detachable connection between the limiting support plate 2212 and the arc-extinguishing chamber 21; at the same time, the connecting plate 2213 is connected to the arc-extinguishing chamber 21, which specifically means that two second clamping protrusions 2216 are respectively protruded on the connecting plate 2213 and arranged opposite along the Y-axis, and the arc-extinguishing chamber 21 is provided with two notches 212 arranged opposite along the Y-axis, one second clamping protrusion 2216 can be assembled and positioned into one notch 212 to realize the detachable connection between the connecting plate 2213 and the arc-extinguishing chamber 21.

[0064] By positioning and assembling the first clamping protrusion 2215 into the clamping hole 211 and positioning and assembling the second clamping protrusion 2216 into the notch 212, the positioning and connecting between the arc-separating main body and the arc-extinguishing chamber 21 can be realized, so that the arc-separating plate 22 and the arc-extinguishing chamber 21 are combined to form a positioning and connecting structure, and the arc-separating plate 22 and the arc-extinguishing chamber 21 can be easily detached.

[0065] And, as shown in Figure 1 , the flat plate 2211 and the connecting plate 2213 are arranged on the arc-extinguishing chamber 21 respectively, so that the flat plate 2211 and the connecting plate 2213 can shield the top of the arc-extinguishing chamber 21, so as to avoid the broken gas in the arc-extinguishing chamber 21 from being sprayed to the rear end, further avoid the broken gas from entering the operating mechanism located at the rear end of the arc-extinguishing chamber 21, and better ensure the reliability of the opening and closing functions of the molded case circuit breaker.

[0066] Further, as shown in Figure 1 and Figure 6 The arc extinguishing system 2 further comprises a reflection plate, which comprises a reflection main plate 231; wherein the arc extinguishing chamber 21 is arranged on the reflection main plate 231, the reflection main plate 231 is provided with a first plug slot 2311, and the other end of the connecting plate 2213 is provided with a first plug 2214; when the limiting support plate 2212 and the connecting plate 2213 are connected with the arc extinguishing chamber 21 respectively, the first plug 2214 is plugged into the first plug slot 2311, so as to connect the arc separation plate 22 and the reflection plate, thereby connecting the arc separation plate 22, the reflection plate and the arc extinguishing chamber 21 to form an arc extinguishing system 2, and ensuring the stability of the arc extinguishing system 2 formed by the connection. Wherein the flat plate 2211, the first inclined plate 222, the two limiting support plates 2212, the connecting plate 2213 and the first plug 2214 are an integral molding structure, that is, the entire arc separation plate 22 is an integral molding structure.

[0067] In this embodiment, the first plug 2214 and the first plug slot 2311 are respectively provided with two, one first plug 2214 is plugged into one first plug slot 2311, which better ensures the connection stability between the arc separation plate 22 and the reflection plate.

[0068] Specifically, as shown in Figure 6 The reflection plate further comprises two baffles 232, which are arranged close to the first plug slot 2311, and the two baffles 232 are connected to the reflection main plate 231 in opposition, and the two baffles 232 are arranged in opposition along the Y axis, and the two baffles 232 are respectively located in the arc extinguishing chamber 21, and the distance between the two baffles 232 gradually increases along the direction close to the center of the arc extinguishing chamber 21 along the X axis.

[0069] As shown in Figure 6 By gradually increasing the distance between the two baffles 232 along the direction close to the center of the arc extinguishing chamber 21 along the X axis, that is, the two baffles 232 are arranged in a horn mouth structure, that is, the distance between the two baffles 232 close to the front end of the arc extinguishing chamber 21 is large, so that the pressure close to the front end of the arc extinguishing chamber 21 is large, and the distance between the two baffles 232 away from the rear end of the arc extinguishing chamber 21 is small, so that the pressure away from the rear end of the arc extinguishing chamber 21 is small, thereby forming a pressure difference, which is conducive to the discharge of the breaking gas close to the front end of the arc extinguishing chamber 21, and better avoids the breaking gas from entering the operating mechanism located at the rear end of the arc extinguishing chamber 21, and further ensures the reliability of the opening and closing functions of the molded case circuit breaker.

[0070] Further, as shown in Figure 2 and Figure 7As shown, the molded case circuit breaker further comprises a base 4, the middle cover 1 is covered on the base 4 to form a mounting space, and the arc extinguishing system 2 is arranged in the mounting space; the middle cover 1 is provided with three accommodating cavities 15 at both ends along the X axis, and the three accommodating cavities 15 at each end are arranged along the Y axis, wherein the three accommodating cavities 15 at one end are respectively provided with second inserts 12, and the middle cover 1 is provided with at least two third inserts 13, which are arranged between the accommodating cavities 15 at both ends of the middle cover 1 along the X axis and are arranged on both sides of the middle accommodating cavity 15 along the Y axis; correspondingly, a plurality of second insertion grooves 41 and a plurality of third insertion grooves 42 are arranged on the base 4, the second inserts 12 are inserted into the corresponding second insertion grooves 41, and the third inserts 13 are inserted into the corresponding third insertion grooves 42.

[0071] Through the insertion action between the second inserts 12 and the second insertion grooves 41, on the one hand, the positioning effect between the base 4 and the middle cover 1 can be better guaranteed, so that the assembly position between the base 4 and the middle cover 1 has high accuracy; on the other hand, since the three second inserts 12 are arranged in the three accommodating cavities 15 at one end, a blocking structure can be formed at the three accommodating cavities 15 at one end, so that dust, water and other impurities cannot enter the mounting space through the edge position of the middle cover 1 and the base 4, thereby guaranteeing that the IP protection level of the entire molded case circuit breaker is high; and since the second inserts 12 and the middle cover 1 are integrated into one structure, the second inserts 12 do not need to be separately arranged, so that the number of parts is small, and the process of separately assembling the second inserts 12 is reduced. In the embodiment, the number of the second inserts 12 and the second insertion grooves 41 is three respectively, and here, the specific number of the second inserts 12 and the second insertion grooves 41 is not limited.

[0072] Moreover, through the insertion action between the third inserts 13 and the third insertion grooves 42, on the one hand, the positioning effect between the base 4 and the middle cover 1 can be further guaranteed, so that the assembly position between the base 4 and the middle cover 1 has higher accuracy; on the other hand, since the at least two third inserts 13 are arranged on both sides of the middle accommodating cavity 15 along the Y axis, the accommodating cavities 15 on both sides along the Y axis can be separated by the third inserts 13, so that the three accommodating cavities 15 along the Y axis are prevented from affecting each other, thereby guaranteeing the insulation effect between the three accommodating cavities 15 along the Y axis; and since the third inserts 13 and the middle cover 1 are integrated into one structure, the third inserts 13 do not need to be separately arranged, so that the number of parts is smaller, and the process of separately assembling the third inserts 13 is reduced. In the embodiment, the number of the third inserts 13 and the third insertion grooves 42 is two respectively, and here, the specific number of the third inserts 13 and the third insertion grooves 42 is not limited.

[0073] Further, as shown in FIG. 1, Figure 2As shown, the middle cover 1 is provided with a second gas baffle 141 and a third gas baffle 142 outside the third insertion piece 13, the lengths of the second gas baffle 141 and the third gas baffle 142 extend along the Y axis, and the second gas baffle 141 and the third gas baffle 142 are arranged along the X axis.

[0074] Specifically, as shown in Figure 2 part of the second gas baffle 141 and the third gas baffle 142 is arranged at the middle position of the A phase of the plastic-enclosed circuit breaker along the X axis, and the other part of the second gas baffle 141 and the third gas baffle 142 is arranged at the middle position of the C phase of the plastic-enclosed circuit breaker along the X axis, so as to avoid the breaking gas from being sprayed to the tripping mechanism at the rear end of the plastic-enclosed circuit breaker after the A phase / C phase breaking, so as to better protect the tripping mechanism, and further ensure the higher reliability of the breaking and closing functions of the plastic-enclosed circuit breaker. The tripping mechanism is a common structure in the existing plastic circuit breaker.

[0075] Specifically, as shown in Figure 8 the plastic-enclosed circuit breaker further comprises a contact system, the contact system comprises a static contact 51, the static contact 51 comprises a base plate 512 and a bent plate 513, one end of the bent plate 513 is connected to the base plate 512, and the other end of the bent plate 513 is arranged above the base plate 512 in a spaced manner, and the base plate 512 and the bent plate 513 are arranged below the arc extinguishing chamber 21, that is, the static contact 51 is formed by tearing to form the base plate 512 and the bent plate 513.

[0076] By tearing the static contact 51 to form the base plate 512 and the bent plate 513, on the one hand, the utilization rate of the raw material of the static contact 51 can be increased, and the forming cost of the static contact 51 can be saved; on the other hand, the width size and the cross-sectional area of the static contact 51 can be increased through the base plate 512 and the bent plate 513, so that the heat dissipation area of the static contact 51 is larger, and the heat dissipation effect is better.

[0077] Further, as shown in Figure 8 the mounting hole 511 is arranged on the bent plate 513, the screw passes through the mounting hole 511 and is threadedly connected to the base 4, so as to integrally fix and connect the static contact 51 and the arc extinguishing system 2 on the base 4.

[0078] Specifically, as shown in Figure 9As shown, the contact system also includes a movable contact 52, which can rotate to abut or disengage from the static contact 51 to achieve the closing and opening functions of the entire molded case circuit breaker. In other words, the aforementioned disconnection process specifically refers to the process of disengaging the movable contact 52 from the static contact 51. In addition, one end of the movable contact 52 is located between the two baffles 232, and the two first insertion slots 2311 are respectively provided on opposite sides of the movable contact 52. The working principle of the movable contact 52 and the static contact 51 is common in existing molded case circuit breakers and will not be described in detail here.

[0079] It is worth noting that if Figure 1 and Figure 9 As shown, one end of the moving contact 52 is located below the flat plate 2211, that is, the flat plate 2211 separates the moving contact 52 from the middle cover 1, so that when the moving contact 52 rotates to open the switch, the moving contact 52 will directly contact and act on the flat plate 2211, reducing the impact of the moving contact 52 on the middle cover 1 and playing a role in protecting the middle cover 1.

[0080] Further, if Figure 9 As shown, at least two heat dissipation holes 521 are provided on the movable contact 52 to increase the heat dissipation area of ​​the movable contact 52 and ensure a better heat dissipation effect of the movable contact 52. In this embodiment, two heat dissipation holes 521 are provided on the movable contact 52. Here, the number of heat dissipation holes 521 is not specifically limited.

[0081] Specifically, if Figure 10 As shown, the molded case circuit breaker also includes a conductive system, which includes a thermal element 61 and a connecting plate 62. The thermal element 61 is connected to the other end of the moving contact 52. One of the thermal element 61 and the connecting plate 62 is provided with a notch 611, and the other is provided with a protrusion 621. The protrusion 621 cooperates with the notch 611 for positioning. The operating principle of the thermal element 61 and the connecting plate 62 is common in existing molded case circuit breakers and will not be described in detail here.

[0082] By fitting the protrusion 621 into the notch 611, accurate positioning between the thermal element 61 and the connecting plate 62 is achieved, facilitating subsequent welding between the thermal element 61 and the connecting plate 62, thereby ensuring subsequent welding efficiency and effect between the thermal element 61 and the connecting plate 62. In this embodiment, the notch 611 is provided on the thermal element 61, and the protrusion 621 is provided on the connecting plate 62.

[0083] The plastic shell circuit breaker in the embodiment can prevent the gas in the arc extinguishing chamber 21 from being sprayed to the rear end of the arc extinguishing chamber 21 during the breaking process of the plastic shell circuit breaker, effectively reduce the post-breaking spray phenomenon of the plastic shell circuit breaker, and further ensure the reliability of the breaking and closing functions of the plastic shell circuit breaker.

[0084] The plastic shell circuit breaker in the embodiment can ensure the overall stability of the formed arc extinguishing system 2 by positioning the first clamping protrusion 2215 into the clamping hole 211, positioning the second clamping protrusion 2216 into the slot 212, and positioning the first insertion sheet 2214 into the first insertion slot 2311, so that the arc separation plate 22, the reflection plate 3 and the arc extinguishing chamber 21 are connected to form an arc extinguishing system 2.

[0085] The plastic shell circuit breaker in the embodiment can have fewer parts and reduce the process of separately assembling the second insertion sheet 12 and the third insertion sheet 13, so that the structure of the entire plastic shell circuit breaker is simple and the assembly is fast and convenient.

[0086] The plastic shell circuit breaker in the embodiment can improve the utilization rate of raw materials and ensure the heat dissipation effect of the static contact 51 by adopting a tearing forming mode, and can increase the heat dissipation area of the moving contact 52 by providing at least two heat dissipation through holes 521 on the moving contact 52, so as to ensure good heat dissipation effect of the moving contact 52.

[0087] The plastic shell circuit breaker in the embodiment can realize accurate positioning between the thermal element 61 and the connecting plate 62 by clamping the protrusion 621 into the gap groove 611, so as to ensure the welding efficiency and effect between the thermal element 61 and the connecting plate 62.

[0088] Embodiment Two

[0089] The plastic shell circuit breaker in the embodiment is basically the same as the plastic shell circuit breaker in Embodiment One, except that the specific structure of the arc separation plate 22 is different. Figures 11 to 13

[0090] Specifically, as shown in Figures 11 to 13 ​As shown, the inclined piece comprises a second inclined plate 224, the second inclined plate 224 is overlapped on the first gas baffle 11, and the second inclined plate 224 and the first gas baffle 11 cooperatively form the above-mentioned blocking structure; the arc separation main body comprises a first shielding plate 2231 and a plug-in plate 2232; wherein one end of the first shielding plate 2231 is foldably connected with the second inclined plate 224, the first shielding plate 2231 is overlapped on the first gas baffle 11, so as to provide a limiting action on the first shielding plate 2231 by the first gas baffle 11; the first shielding plate 2231 and the second inclined plate 224 are respectively arranged on the top end of a part of the arc-extinguishing chamber 21; the plug-in plate 2232 is connected to the other end of the first shielding plate 2231, and the plug-in plate 2232 is plugged into the first plug-in groove 2311 of the reflection main plate 231, so as to connect the arc separation plate 22 and the reflection plate.

[0091] Further, as shown in Figures 11 to 13 , the arc separation main body further comprises a second shielding plate 2233, the second shielding plate 2233 is connected to the opposite sides of the first shielding plate 2231 and the second inclined plate 224 respectively, and the second shielding plate 2233 is arranged on the top end of another part of the arc-extinguishing chamber 21.

[0092] By arranging the first shielding plate 2231, the second inclined plate 224 and the two second shielding plates 2233 on the top end of the arc-extinguishing chamber 21 respectively, the closing effect of the top end of the arc-extinguishing chamber 21 can be better, and the flowing of the breaking gas in the arc-extinguishing chamber 21 to the operating mechanism and the tripping mechanism can be better avoided, thereby further ensuring the reliability of the opening and closing functions of the molded case circuit breaker.

[0093] Further, as shown in Figure 12 and Figure 13 , an abutting table 2234 is protruded on the side of the second inclined plate 224 close to the arc-extinguishing chamber 21; on the one hand, the structural strength of the second inclined plate 224 can be increased; on the other hand, the moving contact 52 can directly contact and act on the abutting table 2234 of the second inclined plate 224, so as to reduce the striking strength of the moving contact 52 on the second inclined plate 224, thereby better ensuring the second inclined plate 224 and the middle cover 1.

[0094] Obviously, the above-mentioned embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For those skilled in the art, various obvious changes, re-adjustments and replacements can be made without departing from the protection scope of the present application. Here, it is unnecessary and impossible to enumerate all the implementation modes. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A molded case circuit breaker characterized by, include: A middle cover (1), wherein the middle cover (1) is provided with a first air baffle (11); An arc extinguishing system (2) comprises an arc extinguishing chamber (21) and an arc extinguishing plate (22), wherein the arc extinguishing plate (22) comprises an arc extinguishing body and an inclined member, wherein the arc extinguishing body is arranged on the arc extinguishing chamber (21), and the inclined member is bent and connected to the arc extinguishing body, wherein the middle cover (1) is arranged on the arc extinguishing plate (22), and the inclined member cooperates with the first air baffle (11) to form a blocking structure.

2. The molded case circuit breaker of claim 1, wherein, The inclined member comprises a first inclined plate (222), and the first inclined plate (222) cooperates with the first air baffle (11) to form the blocking structure; the arc isolation body comprises: A flat plate (2211), wherein the first inclined plate (222) is obliquely connected to one end of the flat plate (2211); Two position-limiting support plates (2212), the two position-limiting support plates (2212) being placed on both sides of the first inclined plate (222), one end of the position-limiting support plate (2212) being connected to one end of the flat plate (2211), the other end of the position-limiting support plate (2212) being connected to the arc-extinguishing chamber (21), and the position-limiting support plate (2212) being overlapped on the first air baffle plate (11); A connecting plate (2213), one end of the connecting plate (2213) is connected to the other end of the flat plate (2211), the connecting plate (2213) and the flat plate (2211) are arranged at an angle, and the connecting plate (2213) is connected to the arc extinguishing chamber (21).

3. The molded case circuit breaker of claim 1, wherein, The inclined member comprises a second inclined plate (224), the second inclined plate (224) is overlapped on the first air baffle plate (11), and the second inclined plate (224) and the first air baffle plate (11) cooperate with each other to form the blocking structure; the arc isolation body comprises: a first shielding plate (2231), one end of the first shielding plate (2231) being bent and connected to the second inclined plate (224), the first shielding plate (2231) and the second inclined plate (224) respectively covering a portion of the top end of the arc extinguishing chamber (21); a plug-in board (2232), connected to the other end of the first shielding plate (2231); A second shielding plate (2233), wherein the first shielding plate (2231) and the second inclined plate (224) are respectively connected to the second shielding plates (2233), and the second shielding plate (2233) is covered on the top of another part of the arc extinguishing chamber (21).

4. The molded case circuit breaker of claim 3, wherein, A contact platform (2234) is protrudingly provided on one side of the second inclined plate (224) close to the arc extinguishing chamber (21).

5. The molded case circuit breaker of claim 2, wherein, The arc extinguishing system (2) further comprises a reflector plate, wherein the reflector plate comprises: A reflective main board (231), the arc extinguishing chamber (21) is provided on the reflective main board (231), the reflective main board (231) is provided with a first plug-in slot (2311), the other end of the connecting plate (2213) is provided with a first plug-in piece (2214), and the first plug-in piece (2214) is plugged into the first plug-in slot (2311); Two baffles (232) are arranged close to the first insertion slot (2311), and the two baffles (232) are connected to the reflection main plate (231) opposite along the Y axis, and the two baffles (232) are respectively located in the arc extinguishing chamber (21), and the distance between the two baffles (232) gradually increases along the direction close to the center of the arc extinguishing chamber (21) along the X axis.

6. The molded case circuit breaker of any one of claims 1-5, wherein, The molded case circuit breaker further comprises a base (4), and the middle cover (1) is arranged on the base (4) to form a mounting space, and the arc extinguishing system (2) is arranged in the mounting space. The middle cover (1) is provided with three accommodating cavities (15) at both ends along the X axis, and the three accommodating cavities (15) at each end are arranged along the Y axis, and the three accommodating cavities (15) at one end are respectively provided with second insertion pieces (12), and the middle cover (1) is provided with at least two third insertion pieces (13), and the at least two third insertion pieces (13) are arranged between the accommodating cavities (15) at both ends of the middle cover (1) along the X axis and are arranged on both sides of the accommodating cavities (15) in the middle along the Y axis. The base (4) is provided with a plurality of second insertion slots (41) and a plurality of third insertion slots (42), the second insertion pieces (12) are inserted into the corresponding second insertion slots (41), and the third insertion pieces (13) are inserted into the corresponding third insertion slots (42).

7. The molded case circuit breaker of claim 6, wherein, The middle cover (1) is provided with a second air baffle (141) and a third air baffle (142) outside the third insertion piece (13), the lengths of the second air baffle (141) and the third air baffle (142) extend along the Y axis, and the second air baffle (141) and the third air baffle (142) are arranged along the X axis.

8. The molded case circuit breaker of any one of claims 1-5, wherein, The molded case circuit breaker further comprises a contact system, and the contact system comprises: A static contact (51) comprising a base plate (512) and a bent plate (513), one end of the bent plate (513) is connected to the base plate (512), and the other end of the bent plate (513) is spaced above the base plate (512), and the base plate (512) and the bent plate (513) are arranged below the arc extinguishing chamber (21).

9. The molded case circuit breaker of claim 8, wherein, The contact system further comprises: A movable contact (52) capable of rotating to abut or separate from the static contact (51), and the movable contact (52) is provided with at least two heat dissipation through holes (521).

10. The molded case circuit breaker of claim 9, wherein, The molded case circuit breaker further comprises an electric conduction system, and the electric conduction system comprises: A thermal element (61) connected to the movable contact (52) and a connecting plate (62), one of the thermal element (61) and the connecting plate (62) is provided with a notch groove (611), and the other is provided with a protrusion (621), and the protrusion (621) and the notch groove (611) are matched and positioned.

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