CN217822630U - Terminal cover and circuit breaker - Google Patents

Abstract

The utility model discloses a terminal cover, including fixed connection's upper terminal cover and lower terminal cover go up terminal cover and lower terminal cover and correspond respectively and be equipped with a plurality of cavitys be equipped with the baffle in the cavity of upper terminal cover, terminal cover still includes insulating baffle and insulating face. Through the arrangement of the metal partition plate in the terminal cover, electric arcs can be dissociated, the electric arc energy in breaking is reduced, the arcing distance is shortened, and interphase or ground short circuit caused by the electric arcs is prevented; through setting up insulating barrier and insulating face, isolate free gas and binding post and the conductive copper bar in the terminal cover, avoided free gas to the breakdown that wiring end probably caused, guarantee electrical apparatus safety.

Description

A terminal cover and a circuit breaker

technical field

The utility model belongs to the technical field of low-voltage electrical appliances, in particular to a terminal cover and a circuit breaker.

Background technique

In the power distribution system, when a short-circuit current occurs in the circuit, the circuit breaker will actively cut off the short-circuit current, thereby protecting the power distribution system and ensuring the safety of personnel, equipment and the entire circuit. But the circuit breaker itself will generate a lot of energy when extinguishing the arc, and most of the energy is ejected from the arc extinguishing chamber of the circuit breaker in the form of an arc. If the arc extinguishing ability of the circuit breaker itself or the insulation system is not good, the ejected arc It is easy to spray on the connecting terminal and the connecting copper bar of the incoming line, thus causing a secondary short circuit between the connecting terminal and the connecting copper bar of the incoming line, and the real purpose of arc extinguishing cannot be achieved. In addition, in order to eliminate the short circuit between the copper bar and the bus bar or the short circuit to the ground caused by the arcing distance, the common practice is to install a terminal cover at the position of the arc spray port in front of the circuit breaker to prevent the arc from spreading around and shorten the arcing time. distance, the terminal cover of the molded case circuit breaker, as the de-separation device for its external connection, has always been an important focus in the industry. There is no isolation between the free gas and the external main circuit connection busbar, which may cause problems such as breakdown hazards. As shown in Figures 1 and 2, the Chinese patent with the publication number CN109300746A discloses a terminal cover. When installing the terminal cover of this structure, the connection row needs to be pre-installed in the terminal cover, and the installation steps are cumbersome. very inconvenient.

Contents of the invention

In order to solve at least one of the above problems, the utility model provides a terminal cover, which can effectively overcome the above problems.

In order to achieve the above object, the utility model adopts the following technical solutions:

A terminal cover, including an upper terminal cover and a lower terminal cover fixedly connected, a plurality of cavities are respectively correspondingly provided on the upper terminal cover and the lower terminal cover, and a partition is provided in the cavity of the upper terminal cover , the terminal cover also includes an insulating baffle and an insulating surface.

In a preferred embodiment, the insulating surface is disposed below the separator.

In a preferred embodiment, the insulating baffle and the insulating surface are arranged on the upper terminal cover or the lower terminal cover.

In a preferred embodiment, "I"-shaped positioning posts are respectively provided on the upper terminal cover and the lower terminal cover.

In a preferred embodiment, the lower terminal cover is provided with an opening slot through front and back.

On the other hand, the utility model also discloses a circuit breaker, which includes a casing, an arc extinguishing system, a static contact assembly, a moving contact assembly, an operating mechanism, a connecting terminal, a conductive copper bar and the terminal cover. The arc system, the static contact assembly, the moving contact assembly and the operating mechanism are arranged in the housing, and it is characterized in that the insulating surface is arranged between the conductive copper bar and the partition plate of the upper terminal cover, so The insulating baffle is arranged between the connecting terminal and the partition of the upper terminal cover.

In a preferred embodiment, the circuit breaker further includes a static contact cover, the static contact cover is a "B"-shaped structure, including an arc blocking part, a horizontal part and a raised part, and the height of the arc blocking part is Greater than the height of the static contact assembly, the arc blocking part is a vertical structure, the horizontal part is arranged between the arc blocking part and the raised part, and a sleeve is provided on the static contact cover. An open slot above the static contact assembly.

In a preferred embodiment, the static contact cover is sheathed on the outside of the static contact assembly, and the arc blocking part is disposed between the arc extinguishing system and the connection terminal.

In a preferred embodiment, the housing includes a base, and an opening slot that cooperates with the arc blocking portion is provided on the base.

In a preferred embodiment, the housing further includes a middle seat, and a buckle that cooperates with the arc blocking portion is provided on the middle seat.

In a preferred embodiment, a through hole is provided on the middle seat.

In a preferred embodiment, the static contact assembly includes a connecting plate, a reverse bending portion and an arc striker, a static contact is provided on the reverse bend, and the arc striker includes a connecting portion , a bending part and an arc guide part, the connecting part is fixed under the reverse bending part, the bending part protrudes upwards until it is substantially flush with the static contact, and then bends downward To the upper side of the connecting plate, the arc guide portion is substantially parallel to the connecting plate.

In a preferred embodiment, a magnetizing part is provided on the connecting part of the arc leading piece, and the magnetizing part protrudes from the connecting part and is flush with the static contact.

In a preferred embodiment, the arc extinguishing system is arranged above the arc guiding part.

The utility model adopts the above scheme, and has the following advantages compared with the prior art:

1. An open slot is provided at the bottom of the static contact cover, so as to facilitate the installation of the arc striker and the static contact assembly;

2. There is a raised part on the right side, which is used to protect the connecting plate and reduce the burning loss of the static contact;

3. There is also a vertical arc blocking part on the left side, which realizes the isolation of the free gas ejected from the terminal and the arc extinguishing system, so as to protect the static contact components and prevent arc burnout;

4. A hollow columnar structure is set on the static contact head cover to facilitate tool disassembly during maintenance or installation;

5. By setting the metal partition in the terminal cover, the arc can be dissociated, reduce the arc energy when breaking, and shorten the arcing distance at the same time, so as to prevent the phase-to-phase or ground short circuit caused by the arc;

6. By setting the insulating baffle and the insulating surface, the free gas in the terminal cover is isolated from the terminal and the conductive copper bar, which avoids the possible breakdown of the free gas to the terminal and ensures the safety of the electrical appliance;

7. The terminal cover is set as an upper and lower split structure, and an open through slot is set on the lower terminal cover, which can accommodate the wiring copper bars to pass through. It is not necessary to install the wiring copper bars in advance during installation, which is convenient for wiring and easy to disassemble during maintenance. , greatly saving time and cost.

Description of drawings

In order to illustrate the technical solution of the utility model more clearly, the accompanying drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the utility model. For Those of ordinary skill in the art can also obtain other drawings based on these drawings without making creative efforts.

FIG. 1 is a schematic structural diagram of a lower terminal cover in the background art.

FIG. 2 is an exploded schematic diagram of a terminal cover in the background art.

Fig. 3 is a schematic diagram of the internal structure of the circuit breaker of the present invention.

Fig. 4 is a schematic diagram of the structure of the static contact of the present invention.

Fig. 5 is a structural schematic diagram of the arc-leading sheet of the present invention.

Fig. 6 is a schematic diagram of the structure of the static contact head cover of the present invention.

Fig. 7 is a schematic diagram of the assembly of the static contact cover and the static contact of the present invention.

Fig. 8 is an exploded schematic diagram of the static contact cover and the static contact of the present invention.

Fig. 9 is a partial schematic diagram of the assembly of the static contact head cover and the circuit breaker base of the present invention.

Fig. 10 is a schematic diagram of the partial structure of the middle seat of the circuit breaker of the present invention.

Fig. 11 is an exploded schematic view of the terminal cover of the present invention.

Fig. 12 is a schematic diagram of the structure of the lower terminal cover of the present invention.

Fig. 13 is a partial schematic diagram of the assembly of the terminal cover and the circuit breaker body of the present invention.

Detailed ways

The preferred embodiments of the utility model will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the utility model can be more easily understood by those skilled in the art. It should be noted here that the descriptions of these implementations are used to help understand the utility model, but are not intended to limit the utility model.

Please refer to FIG. 3 to FIG. 5, the utility model discloses a circuit breaker, the circuit breaker includes a body 10, the body 10 includes a housing 100, an arc extinguishing system 200, a static contact assembly 300, a moving contact Assembly 400 and operating mechanism 500, the arc extinguishing system 200, the static contact assembly 300, the moving contact assembly 400 and the operating mechanism 500 are set in the housing 100, and the static contact assembly 300 is fixed with a static contact point 310, the moving contact assembly 400 is provided with a moving contact 410, driven by the operating mechanism 500, the moving contact 410 of the moving contact assembly 400 and the static contact assembly 300 The contacts 321 are contacted or separated, so as to realize the connection or disconnection of the circuit. The arc extinguishing system 200 is used to eliminate the arc generated when the moving contact assembly 400 and the static contact assembly 300 are disconnected, so as to ensure the safety of electrical appliances .

Specifically, the static contact assembly 300 includes a connecting plate 310 and a reverse bent portion 320, one end of the connecting plate 310 is provided with a protruding first bending structure 311, and the first bending structure 311 passes through The connecting terminal 610 is fixedly connected to the external conductive copper bar 600, and the static contact 321 is arranged on the reverse bending part 320. On the contact assembly 300 , the static contact 321 is in contact with the movable contact 410 of the movable contact assembly 400 , so as to realize the conduction of the circuit.

The arc leading piece 330 is provided on the static contact assembly 300, the arc leading piece 320 is fixedly connected with the static contact assembly 300, when the moving contact assembly 400 and the static contact assembly 300 are disconnected The generated arc can enter the arc extinguishing system 200 along the arc leading plate 320, so as to achieve a better arc extinguishing effect. Specifically, the arc guiding piece 330 includes an integrally formed connecting portion 331 , a bending portion 332 and an arc guiding portion 333 , and the bending portion 332 is disposed between the connecting portion 331 and the arc guiding portion 333 . The connecting part 331 is arranged below the static contact 321, and is fixedly connected with the reverse bending part 320 by screws, and the reverse bending part 320 and the connecting part 331 are respectively provided with The through holes through which the screws pass are accommodated, so as to realize the fixing of the arc leading piece 330 . The bending part 332 is arranged at the front end of the reverse bending part 320, protrudes upwards until it is substantially flush with the static contact 321, and then bends downwards above the connecting plate 310. The arc guiding portion 333 sinks to be parallel to or tends to be parallel to the connecting plate 310 , and the arc extinguishing system 200 is disposed above the arc guiding portion 333 . It should be noted that there is no contact between the arc guiding part 333 and the connecting plate 310, and there is a gap between them. An insulating plate is provided between the plates 310 to separate them.

In this implementation, the connecting portion 331 is further provided with a magnetizing portion 334, the magnetizing portion 334 protrudes from the connecting portion 331, and is arranged on both sides of the stationary contact 321, and its height is the same as The static contacts 321 are flush or tend to be flush. The magnetizing part 334 and the connecting part 331 are integrally formed, and the arc leading piece 320 is made of ferromagnetic material. The number of the magnetization part 334 can be one or more. In this embodiment, the number of the magnetization part 334 is two, which are respectively arranged on both sides of the stationary contact 321 .

When there is a short-circuit fault in the line, the circuit breaker trips to separate the static and dynamic contacts, and at the same time, an arc is generated between the static and dynamic contacts. The arc root is transferred from the static contact 321 to the arc striker 330, and as the arc striker 330 is bent downward, the arc root on the side of the arc close to the static contact 300 is transferred to the arc striker along the bending part 332 On the arc guide part 333 at the end of the sheet 330, the grid sheet arranged under the arc extinguishing system 200 at the position from the static contact 321 to the static contact connecting plate 310 at this time participates in the cutting arc smoothly, increasing the arcing voltage when the circuit breaker is broken, so that The arc is extinguished quickly, the breaking capacity of the circuit breaker is improved, and the space between the static contact and the connecting plate of the static contact can be fully utilized.

The arc striker 330 is provided with a magnetization part 334 on both sides of the static contact 321, and its height is flush with or tends to be flush with the static contact 321. During the process, the arc root can be quickly transferred from the static contact 321 to the arc striker 330, so as to reduce the burning loss of the static contact 321 and avoid the adverse consequences that the circuit breaker cannot be turned on after the circuit breaker is closed.

Referring to Fig. 3, Fig. 6 to Fig. 10, the circuit breaker further includes a static contact cover 700 made of insulating material, and in this embodiment, the static contact cover 700 is made of plastic. The static contact cover 700 is sleeved on the static contact assembly 300 and is roughly in the shape of a "B" shape. Specifically, the static contact cover 700 includes an arc blocking part 710, a horizontal part 720 and a raised part 730, the horizontal portion 720 is disposed between the arc blocking portion 710 and the raised portion 730, and is connected to both. The arc blocking portion 710 and the horizontal portion 720 respectively cooperate with the connecting plate 310 of the static contact assembly 300 , specifically, the arc blocking portion 710 cooperates with the first bending structure 311 of the connecting plate 310 , the horizontal part 720 cooperates with the straight part between the first bending structure 311 and the reverse bending part 320 on the connecting plate 310, and the arc blocking part 710 is provided with the first An open slot 712 matched with the bending structure 311, an open slot 722 matched with the straight part of the connecting plate 310 is provided at the bottom of the horizontal part 720, and the straight part is arranged in the open slot 722 , the horizontal part 720 is also provided with a space-avoiding slot 721 to accommodate the arc-guiding part 333 of the arc-leading piece 330 to pass through, so as to facilitate the installation of the arc-leading piece 330, and the space-avoiding slot 721 A protruding structure 722 is provided in the circumferential direction to increase the strength of the static contact cover 700 . The raised portion 730 is sleeved on the outside of the reversed bent portion 320, and a cavity 731 for accommodating the reversed bent portion 320 is provided on the raised portion 730, the reversed bent portion The portion 320 is disposed inside the cavity 731 , and the static contact 321 is disposed outside the cavity 731 , so as to avoid being covered by the protruding portion 730 and affect its normal electrification.

It should be noted that the arc blocking portion 710 is a vertical structure, and its height is greater than the height of the first bending structure 311 protruding from the connecting plate 310. During assembly, the arc blocking portion 710 is arranged on the between the arc extinguishing system 200 and the connecting terminal 610, thereby isolating the arc extinguishing system 200 from the connecting terminal 610 and the conductive copper bar 600 connected to the connecting terminal 610, avoiding the arc extinguishing system 200 The ejected residual gas causes a secondary short circuit between the connection terminal and the incoming conductive copper bar 600 , thereby ensuring the safety of electrical appliances.

A second bending structure 713 is provided on the arc blocking portion 710, and a raised hollow columnar structure 714 is provided on the second bending structure 713, and the hollow columnar structure 714 is correspondingly arranged on the terminal 610, so that wiring can be carried out through the hollow columnar structure 714 when the user uses it. Reinforcing ribs 711 are also provided on both sides of the arc blocking portion 710. On the one hand, the reinforcing ribs 711 can increase the strength of the arc blocking portion 710, and on the other hand, together with the second bending structure 713, the The assembly of the static contact cover 700 and the housing 100 is described.

Specifically, in this embodiment, the housing 100 includes a base 110 and a middle seat 120, the base 110 and the middle seat 120 are fixedly connected, and the base 110 is arranged under the middle seat 120 , the base 110 is provided with an opening groove 111 matching with the arc blocking portion 710 and a protrusion 112 matching with the second bending structure 713, and the reinforcing rib 711 is embedded in the opening groove 111 In this way, the insulation of the static contact cover 700 is guaranteed to be reliable, so as to avoid possible breakdown of the arc at the gas outlet position of the arc extinguishing system 200 and the connection terminal 610 . Correspondingly, a through hole 121 is provided on the middle seat 120, and a circular groove 122 matched with the hollow columnar structure 714 is provided at the head of the through hole 121, and the head of the hollow columnar structure 714 The portion protrudes into the circular groove 122, thereby providing a space for user wiring to pass through. There is also a buckle 123 on the middle seat 120, and the buckle 123 is engaged with the second bending structure 713, so as to realize the connection between the static contact cover 700, the base 110 and the middle seat 120. fixed connection.

The bottom of the static contact cover 700 is provided with an opening slot 712 and an opening slot 722, thereby facilitating the installation of the arc striker 330 and the static contact assembly 300; the right side has a raised portion 730 for protecting the connecting plate and reducing Burning loss of static contacts; there is also a vertical arc shielding part 710 on the left side, which realizes the isolation of the free gas ejected from the terminal 610 and the arc extinguishing system 200, thereby protecting the static contact components and preventing arc burning effect. The hollow columnar structure 714 on the static contact head cover 700 is convenient for tool removal during maintenance or installation.

Further, please refer to FIG. 11 to FIG. 13 , the circuit breaker also includes a terminal cover 800 , the terminal cover 800 is fixedly connected to the circuit breaker body 10 and is arranged on a side close to the arc extinguishing system 200 , the terminal cover 800 includes an upper terminal cover 810 and a lower terminal cover 820, the upper terminal cover 810 and the lower terminal cover 820 are fixedly connected by fasteners such as screws, and the upper terminal cover 810 and the lower A number of cavities 811 and cavities 821 are correspondingly provided on the terminal cover 820, and the number of cavities 811 and cavities 821 is equal to the number of poles of the circuit breaker. In this embodiment, the cavities The number of 811 and cavity 821 is 2, of course, in other embodiments, the number can be 3 or 4. A fixing plate 812 is provided on the upper terminal cover 810 , one end of the fixing plate 812 protrudes and is fixedly connected with the circuit breaker body 10 , and a screw hole for receiving a screw is provided on the fixing plate 812 . There are several partitions 813 arranged in sequence in the cavity 811, and a number of through holes are arranged on the partitions 813. The partitions 813 are made of metal materials and are cut by the arc extinguishing system 200. The arc enters the cavity 811 of the upper terminal cover 810 from the arc extinguishing system 200, and passes through the through holes on the separators 813 arranged in sequence for further cutting and cooling, and finally passes through the upper terminal cover 810 The through hole 814 provided on the side away from the arc extinguishing system 200 discharges the terminal cover 800 .

On the side wall of the cavity 811 of the upper terminal cover 810, an "I"-shaped positioning column 815 is provided, corresponding to the positioning column 815, and on the side wall of the cavity 821 of the lower terminal cover 820 is provided The "I"-shaped positioning column 822 is respectively provided with through grooves corresponding to the positioning column 815 and the positioning column 822 on the casing 100 of the circuit breaker body 10, through which the positioning column 815, the positioning column The cooperation between 822 and the through groove guides and fixes the assembly of the terminal cover 800 , so that the upper terminal cover 810 and the lower terminal cover 820 are closely and firmly combined.

Please continue to refer to FIG. 12 and FIG. 13 , the cavity 821 of the lower terminal cover 820 is provided with an open slot through front and back to accommodate the conductive copper bar 600 passing through, and the lower part of the open slot is an open structure , directly penetrates to the bottom of the lower terminal cover, and there is no need to disassemble the terminal cover 800 during installation or maintenance, thereby greatly saving time and cost. The lower terminal cover 820 is provided with an insulating surface 823, and the insulating surface 823 is arranged between the upper terminal cover 820 and the conductive copper bar 600, so that the upper terminal cover 810 and the conductive copper bar 600 to prevent the free gas in the upper terminal cover 810 from causing breakdown damage to the conductive copper bar 600 . Further, an insulating baffle 824 is provided on the lower terminal cover 820, and the insulating baffle 824 is arranged between the connecting terminal 610 and the metal grid of the upper terminal cover 820, so that the connecting terminal 610 It is isolated from the metal grid of the upper terminal cover 820 to prevent breakdown of the terminal caused by arc sputtering, thereby ensuring the safety of electrical appliances.

It should be noted that, besides the lower terminal cover 820, the insulating surface 823 and the insulating barrier 824 can also be provided on the upper terminal cover 820, or can be respectively provided on the upper terminal cover 820. On the cover 810 and the lower terminal cover 820, as long as the function can be realized, there is no limitation here.

The circuit breaker of this embodiment, by setting the metal partition in the terminal cover, can dissociate the arc, reduce the arc energy when breaking, and shorten the arcing distance at the same time, so as to prevent the phase-to-phase or ground short circuit caused by the arc; The insulating baffle and the insulating surface isolate the free gas in the terminal cover from the terminal and the conductive copper bar, avoiding the possible breakdown of the free gas to the terminal and ensuring the safety of the electrical appliance. The terminal cover is set up and down The split structure has an open slot on the lower terminal cover, which can accommodate the wiring copper bars to pass through. It is not necessary to install the wiring copper bars in advance during installation. It is convenient for wiring and easy to disassemble during maintenance, which greatly saves time and cost.

As shown in this specification and claims, the terms "comprising" and "comprising" only suggest the inclusion of explicitly identified steps and elements, and these steps and elements do not constitute an exclusive list, and the method or device may also include other steps or elements. As used herein, the term "and/or" includes any combination of one or more of the associated listed items.

It should be noted that, unless otherwise specified, when a feature is called "fixed" or "connected" to another feature, it can be directly fixed and connected to another feature, or indirectly fixed and connected to another feature. on a feature. In addition, the descriptions such as up, down, left, and right used in the utility model are only relative to the mutual positional relationship of the various components of the utility model in the drawings.

It can be further understood that "plurality" in the present disclosure refers to two or more, and other quantifiers are similar thereto.

The above-mentioned embodiment is only to illustrate the technical conception and characteristics of the present utility model. It is a preferred embodiment. Protection scope of utility model. All equivalent transformations or modifications made according to the principle of the utility model shall be covered within the protection scope of the utility model.

Claims (11)

1. A terminal cover, including an upper terminal cover and a lower terminal cover fixedly connected, and a plurality of cavities are correspondingly provided on the upper terminal cover and the lower terminal cover respectively, and a cavity is provided in the cavity of the upper terminal cover The spacer is characterized in that the terminal cover further includes an insulating baffle and an insulating surface. 2 . The terminal cover according to claim 1 , wherein the insulating surface is disposed under the separator. 3 . 3. A terminal cover according to claim 1 or 2, wherein the insulating baffle and the insulating surface are provided on the upper terminal cover or the lower terminal cover. 4 . The terminal cover according to claim 1 , wherein the upper terminal cover and the lower terminal cover are respectively provided with "I"-shaped positioning posts. 5 . The terminal cover according to claim 1 , characterized in that, the lower terminal cover is provided with an open slot passing through front and back. 6 . 6. A circuit breaker, comprising a housing, an arc extinguishing system, a static contact assembly, a moving contact assembly, an operating mechanism, a connecting terminal, a conductive copper bar, and a terminal cover as claimed in any one of claims 1 to 5, wherein The arc extinguishing system, the static contact assembly, the moving contact assembly and the operating mechanism are arranged in the casing, and it is characterized in that the insulating surface is arranged between the conductive copper bar and the partition plate of the upper terminal cover , the insulating baffle is arranged between the connecting terminal and the partition of the upper terminal cover. 7. A circuit breaker according to claim 6, characterized in that, the circuit breaker also includes a static contact cover, the static contact cover is a "B"-shaped structure, including an arc blocking part, a horizontal part and The raised part, the height of the arc-stopping part is greater than the height of the static contact assembly, the arc-stopping part is a vertical structure, and the horizontal part is arranged between the arc-stopping part and the raised part. The static contact cover is provided with an opening slot sleeved above the static contact assembly. 8. A circuit breaker according to claim 7, wherein the static contact cover is sleeved on the outside of the static contact assembly, and the arc blocking part is provided on the arc extinguishing system and the between the terminals mentioned above. 9. A circuit breaker according to claim 6, wherein the static contact assembly comprises a connecting plate, a reverse bending part and an arc striker, and a static contact is arranged on the reverse bending part. Contact, the arc leading piece includes a connecting part, a bending part and an arc guiding part, the connecting part is fixed under the reverse bending part, and the bending part protrudes upwards to meet the static The contacts are substantially flat, and then bent downward to the top of the connecting plate, and the arc guide part is roughly parallel to the connecting plate. 10. A circuit breaker according to claim 9, characterized in that a magnetizing part is provided on the connecting part of the arc leading piece, and the magnetizing part protrudes from the connecting part and is in contact with the connecting part The static contacts are flush. 11. The circuit breaker according to claim 9, wherein the arc extinguishing system is arranged above the arc guiding part.

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