CN215220638U - Heavy current circuit breaker - Google Patents

Abstract

The utility model discloses a heavy current circuit breaker, which comprises a shell, a moving contact, a static contact, an arc extinguish chamber and a lock catch, wherein the moving contact, the static contact, the arc extinguish chamber and the lock catch are arranged in the shell; the lock catch is positioned above the matching position of the movable contact and the static contact; the static contact is provided with an arc conducting part; an arc striking plate is also arranged in the shell, and an arc striking channel is formed by the arc striking plate and the arc guiding part; the bottom of the lock catch extends towards the direction of the matching position of the movable contact and the static contact to form a downward airflow when the lock catch is linked to break the movable contact and the static contact, and the thickened part of the lock catch moves above the matching position of the movable contact and the static contact to blow the arc generated by breaking between the movable contact and the static contact to accelerate the downward movement. The utility model can solve the problem of unsmooth arc striking caused by the increase of current, thereby realizing rapid arc extinguishing; the problem of serious temperature rise at the contact caused by large current can be solved, and the stability of the parameters of the circuit breaker is ensured; meanwhile, the breaking capacity and the electric service life of the circuit breaker can be improved.

Description

Heavy current circuit breaker

Technical Field

The utility model belongs to the technical field of the circuit breaker, especially, relate to a heavy current circuit breaker.

Background

The circuit breaker is a switching device capable of closing, carrying, and opening/closing a current under a normal circuit condition and a current under an abnormal circuit condition for a predetermined time. The circuit breaker in the prior art generally comprises a shell, a connecting terminal, a moving contact, a static contact, an arc extinguish chamber, a lock catch and other components, wherein the moving contact and the static contact are respectively arranged at corresponding matched positions in the shell, the moving contact is connected with the moving contact, the static contact is connected with the static contact, the lock catch is linked with the moving contact, the lock catch is used for locking the degree of freedom, after the lock catch is released, the degree of freedom of a mechanism is increased, all mechanism parts move freely to achieve the aim of dividing, when the lock catch is locked, the mechanism moves correspondingly along with the movement of a handle, the lock catch is generally positioned above the matched position of the moving contact and the static contact, the arc extinguish chamber is generally arranged below a connecting passage of an incoming terminal and the static contact, the static contact is generally provided with a bent arc guide part, an arc striking plate is also arranged below the matched position of the moving contact and the static contact, and the arc striking plate is generally arranged into an arc structure correspondingly matched with the bent arc guide part of the static contact, the arc generated when the movable contact is disconnected with the fixed contact is guided to the arc extinguishing chamber by utilizing the matching of the arc striking plate and the arc guiding part of the fixed contact. When the breaker is used as a high-current breaker, the following defects mainly exist:

first, the problem that the striking is not smooth because behind the current increase, electric arc also grow, if can not lead to the explosion chamber with electric arc fast, then cause the moving contact to burn out easily to influence the normal use of circuit breaker.

Secondly, the temperature rise at the contact point is severe due to the large current, and the stability of the parameters of the circuit breaker is further influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provide a heavy current circuit breaker, which can solve the problem of unsmooth arc striking caused by the increase of current on one hand through the structural improvement, thereby realizing the rapid arc extinguishing; on the other hand, the problem of serious temperature rise at the contact caused by large current can be solved, and the stability of the parameters of the circuit breaker is ensured; the breaking capacity and the electric service life of the circuit breaker can be improved.

The utility model provides a technical scheme that its technical problem adopted is: a high-current circuit breaker comprises a shell, a moving contact, a fixed contact, an arc extinguish chamber and a lock catch, wherein the moving contact, the fixed contact, the arc extinguish chamber and the lock catch are arranged in the shell; the movable contact of the movable contact and the static contact of the static contact are respectively arranged at matched positions; the lock catch is positioned above the matching position of the moving contact and the static contact and is linked with the moving contact; the arc extinguish chamber is arranged at the bottom of the shell; in the static contact, a bent arc guide part is also arranged below the static contact in an extending manner; an arc striking plate is also arranged in the shell and is positioned at a position correspondingly matched with the arc guiding part, and an arc striking channel is formed between the arc striking plate and the arc guiding part; the bottom of the lock catch also extends towards the direction of the matching position of the movable contact and the static contact to form a thickened part, so that when the lock catch is linked to disconnect the movable contact and the static contact, the thickened part of the lock catch moves above the matching position of the movable contact and the static contact to form a downward airflow to blow the electric arc generated by the disconnection between the movable contact and the static contact to accelerate the downward movement; in the arc striking plate, a straight plate structure is arranged at a position corresponding to the arc guiding part, so that the arc striking plate is closer to the position where the moving and static contacts generate electric arcs in the vertical distance, and a small slit is formed between the arc striking plate and the arc guiding part, thereby accelerating the electric arcs to move towards the arc extinguishing chamber.

The thickened part at the bottom of the lock catch is close to the matching position of the movable contact and the static contact and keeps a tiny gap so as to form a movable retaining wall above the matching position of the movable contact and the static contact; when the lock catch is linked to disconnect the movable contact and the static contact, the thickened part at the bottom of the lock catch moves to the position above the matching position of the movable contact and the static contact, and the electric arc is prevented from moving upwards.

And a straight plate structure in the arc striking plate is obliquely arranged at a position opposite to the arc guiding part.

The circuit breaker further comprises two wiring terminals mounted at both ends of the length of the housing; the two wiring terminals are respectively electrically communicated with the moving contact and the fixed contact; the arc extinguish chamber is arranged below a passage through which one of the two wiring terminals is communicated with the fixed contact.

The static contact also comprises a horizontal fixing part and a static contact connecting part; the horizontal fixing part is electrically communicated with one of the wiring terminals, the static contact connecting part is integrally connected between the horizontal fixing part and the arc conducting part, and the static contact is fixed in one surface of the static contact connecting part facing the direction of the moving contact; the static contact is at least provided with a thickened part for solving the temperature rise problem at the contact, and a thinning part is arranged in one surface of the static contact connecting part facing the direction of the moving contact, so that the distance between the dynamic contact and the static contact is ensured by utilizing the abdication of the thickening part of the static contact by the thinning part of the static contact.

The static contact connecting part and the arc guiding part form a step by the thinned part of the static contact connecting part, and the static contact with the thickened part is fixed on the step.

The width dimension of the step surface of the step of the stationary contact connecting portion is the same as the thickness dimension of the stationary contact with the thickened portion, and the stationary contact with the thickened portion is completely fitted in the step surface of the step of the stationary contact connecting portion.

The width dimension of the step surface of the step of the stationary contact connecting portion is smaller than the thickness dimension of the stationary contact with the thickened portion, and a part of the stationary contact with the thickened portion protrudes out of the step surface of the step of the stationary contact connecting portion.

One of the connecting terminals is an inlet terminal, an electromagnetic release is further arranged in a passage where the inlet terminal is communicated with the fixed contact, and the electromagnetic release is arranged on the arc extinguish chamber.

The other connecting terminal of the two connecting terminals is an outlet terminal, and a current transformer is further arranged in a connecting passage between the outlet terminal and the moving contact; and the outlet terminal passes through the magnetic core of the current transformer.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the utility model adopts the structure that the thickened part extends towards the matching position of the moving contact and the static contact at the bottom of the lock catch, so that when the moving contact and the static contact are disconnected in the lock catch linkage, the thickened part of the lock catch moves above the matching position of the moving contact and the static contact to form a downward air flow, and the downward movement is accelerated by the electric arc generated by the disconnection between the blowing contact and the static contact; in the arc striking plate, a straight plate structure is arranged at a position corresponding to the arc guiding part, so that the arc striking plate is closer to the position where the moving and static contacts generate electric arcs in the vertical distance, and a small slit is formed between the arc striking plate and the arc guiding part, thereby accelerating the electric arcs to move towards the arc extinguishing chamber. The utility model discloses a this kind of structure is that the bodiness portion that utilizes the bottom of hasp cooperatees with the straight plate structure in the striking plate to make electric arc between moving, the stationary contact downwards fast and guided to the explosion chamber in, solved the not smooth problem of striking because of the increase of electric current causes, thereby realize quick arc extinguishing.

2. The utility model discloses owing to adopted the stationary contact to be equipped with the thickening portion that is used for solving the contact point problem of rising in temperature at least, the orientation of stationary contact connecting portion be equipped with the portion of reducing thickness in the one side of moving contact direction to the portion of stepping down of the thickening portion of stationary contact is to the portion of reducing thickness that utilizes the static contact, guarantees the opening distance between the sound contact. The structure of the utility model solves the problem of temperature rise at the contact by increasing and thickening the static contact, and simultaneously, eliminates the influence on the distance between the static contact and the static contact after the static contact is thickened by matching with the thinning part of the static contact, thereby not only solving the problem of more serious temperature rise at the contact caused by larger current, but also ensuring the stability of the parameters of the circuit breaker; the breaking capacity and the electric service life of the circuit breaker can be improved.

3. The utility model discloses owing to adopted the width size design of the step face with the step of stationary contact connecting portion to be less than the thickness size of the stationary contact with thickening portion, the partly protrusion of the stationary contact with thickening portion is in the step off-plate of the step of stationary contact connecting portion. The utility model discloses a this kind of structure, produced electric arc can remove along the arc portion of leading of static contact better when making the movable contact break off to realize quick arc extinguishing.

The present invention will be described in further detail with reference to the accompanying drawings and examples; however, the present invention is not limited to the embodiment.

Drawings

Fig. 1 is a schematic structural view of an embodiment of the present invention;

fig. 2 is a front view (open state) of a part of the components of the embodiment of the present invention;

fig. 3 is a front view (closing state) of a part of the components of the embodiment of the present invention;

fig. 4 is a front view (instant before tripping) of part of the components of an embodiment of the invention;

fig. 5 is a front view of part of an embodiment of the invention (instantaneous in tripping);

fig. 6 is a schematic perspective view of a static contact according to an embodiment of the present invention;

fig. 7 is a schematic perspective view of a static contact (not including a static contact) according to an embodiment of the present invention;

fig. 8 is a front view of a stationary contact (not including a stationary contact) according to an embodiment of the present invention.

Detailed Description

Examples

Referring to fig. 1 to 8, the heavy current circuit breaker of the present invention includes a housing 1, a moving contact 2, a static contact 3, an arc extinguish chamber 4 and a lock catch 5 installed in the housing; the moving contact 21 of the moving contact 2 and the static contact 31 of the static contact 3 are respectively arranged at the matched positions; the lock catch 5 is positioned above the matching position of the movable contact 21 and the fixed contact 31, and the lock catch 5 is linked with the movable contact 2; the arc extinguish chamber 4 is arranged at the bottom of the shell 1; in the static contact 3, a bent arc-guiding part 32 is further extended and arranged below the static contact 31; an arc striking plate 6 is further installed in the shell 1, the arc striking plate 6 is located at a position corresponding to and matched with the arc guiding part 32, the arc striking plate 6 and the arc guiding part 32 form an arc striking channel 10, and the arc striking channel 10 is arranged between the matched position of the movable contact 21 and the fixed contact 31 and the arc extinguishing chamber 4; the bottom of the lock catch 5 is also provided with a thickened part 51 extending towards the direction of the matching position of the moving contact and the static contact, so that when the lock catch 5 is linked with the movable contact 21 and the static contact 31 to be disconnected, the thickened part 51 of the lock catch 5 moves above the matching position of the moving contact and the static contact to form a downward airflow, and the downward movement is accelerated by the electric arc generated by the disconnection between the moving contact and the static contact; in the arc starting plate 6, a straight plate structure 61 is arranged at a position corresponding to the arc guiding part 32, so that the arc starting plate 6 is closer to a position where the moving and static contacts generate electric arcs in a vertical distance, and a small slit is formed with the arc guiding part 32, thereby accelerating the movement of the electric arcs to the arc extinguishing chamber.

In the present invention, the definitions of the upper, lower, bottom, and the like described to indicate the orientations only indicate the relative positional relationships between the components or between the structures in the components.

In this embodiment, the thickened portion 51 at the bottom of the latch 5 is close to the mating position of the movable contact and the stationary contact and a small gap is reserved, so as to form a movable retaining wall above the mating position of the movable contact and the stationary contact; when the moving contact and the static contact of the lock catch 5 are disconnected, the thickened part 51 at the bottom of the lock catch 5 moves to the position above the matching position of the moving contact and the static contact, and the electric arc is prevented from moving upwards.

In this embodiment, the straight plate structure 61 of the arc ignition plate 6 is obliquely disposed at a position opposite to the arc guiding portion 32.

In this embodiment, the circuit breaker further includes two connection terminals 71, 72 installed at both ends of the length of the case 1; the two wiring terminals 71 and 72 are respectively electrically communicated with the moving contact 2 and the fixed contact 3; the arc extinguish chamber 4 is arranged below a passage of one of the two connecting terminals 71 communicated with the fixed contact 3. The length of the housing 1 refers to the dimension from the inlet end to the outlet end of the single-pole circuit breaker.

In this embodiment, the static contact 3 further includes a horizontal fixing portion 33 and a static contact connecting portion 34; the horizontal fixing portion 33 is electrically communicated with one of the connection terminals 71, the stationary contact connecting portion 34 is integrally connected between the horizontal fixing portion 33 and the arc guiding portion 32, and the stationary contact 31 is fixed in a surface of the stationary contact connecting portion 34 facing the direction of the movable contact 3; the static contact 31 is at least provided with a thickened part 311 for solving the temperature rise problem at the contact, and one surface of the static contact connecting part 34 facing the moving contact direction is provided with a thinned part 341, so that the opening distance between the static contact and the static contact is ensured by utilizing the abdication of the thinned part 341 of the static contact 3 to the thickened part 311 of the static contact 31.

In this embodiment, the thinned portion 341 of the stationary contact connecting portion 34 forms a step 35 with the stationary contact connecting portion 34 and the arc guiding portion 32, and the stationary contact 31 having a thickened portion is fixed on the step 35.

In the present embodiment, the width dimension of the step surface of the step 35 of the stationary contact connection portion 34 is smaller than the thickness dimension of the stationary contact 31 having a thickened portion, and a part of the stationary contact 31 having a thickened portion protrudes out of the step surface of the step 35 of the stationary contact connection portion 34. Of course, the width dimension of the step face of the step 35 of the stationary contact connecting portion 34 may also be designed to be the same as the thickness dimension of the stationary contact having the thickened portion that is completely fitted in the step face of the step of the stationary contact connecting portion, as needed.

In this embodiment, one of the connection terminals 71 is a line terminal, an electromagnetic trip 8 is further disposed in a path where the line terminal 71 communicates with the stationary contact 3, and the electromagnetic trip 8 is disposed on the arc extinguish chamber 4.

In this embodiment, the other connection terminal 72 of the two connection terminals is an outlet terminal, and a current transformer 9 is further disposed in a connection path between the outlet terminal 72 and the moving contact 2; the outlet terminal 72 is passed through the magnetic core of the current transformer 9 by a flexible wire.

The utility model discloses a heavy current circuit breaker, adopted in the bottom of hasp 5 still to the movable and static contact cooperation position direction extension is equipped with thickening portion 51, so that when 5 linkages of hasp move, the stationary contact breaks off, thickening portion 51 of hasp 5 moves above the movable and static contact cooperation position, form a downward air current, in order to blow the electric arc that breaks off and produce between the movable contact and the stationary contact and accelerate to move downwards, as shown in figure 4, from closing a floodgate state to the dropout instant, hasp 5 moves, discharges the air between hasp 5 and moving contact 2, form the air current; in the arc starting plate 6, a straight plate structure 61 is arranged at a position corresponding to the arc guiding part 32, so that the arc starting plate 6 is closer to a position where the moving and static contacts generate electric arcs in a vertical distance, and a small slit is formed with the arc guiding part 32, thereby accelerating the movement of the electric arcs to the direction of the arc extinguishing chamber 4. The utility model discloses a this kind of structure is that the bodiness 51 of the bottom that utilizes hasp 5 cooperatees with straight board structure 61 in the striking plate 6 to make electric arc between the movable contact and the stationary contact downwards and be led to the explosion chamber 4 fast, solved the unsmooth problem of striking because of the electric current increase causes, thereby realize quick arc extinguishing. The utility model also designs the thickened part 51 at the bottom of the lock catch 5 to be close to the matching position of the movable contact and the static contact and keep a small gap so as to form a movable retaining wall above the matching position of the movable contact and the static contact; when the moving contact and the static contact of the lock catch 5 are disconnected, the thickened part 51 at the bottom of the lock catch 5 moves to the position above the matching position of the moving contact and the static contact, so that the arc is prevented from moving upwards, and as shown in fig. 5, in the process of tripping, the lock catch 5 moves to the position above the moving contact and the static contact, and the possibility of the arc moving upwards is blocked.

The utility model discloses a large current circuit breaker has adopted stationary contact 31 to be equipped with the thickening portion 311 that is used for solving the contact point problem of rising temperature at least, the orientation of stationary contact connecting portion 34 be equipped with the portion of thinning 341 in the one side of moving contact direction to utilize the portion of thinning 341 of static contact 3 to stepping down of thickening portion 311 of stationary contact 31, guarantee the opening distance between the sound contact. The structure of the utility model solves the problem of temperature rise at the contact by increasing and thickening the static contact 31, and simultaneously, eliminates the influence on the distance between the static contact and the static contact after the static contact is thickened by matching with the thinning part 341 of the static contact 3, thereby not only solving the problem of more serious temperature rise at the contact caused by larger current, but also ensuring the stability of the parameters of the circuit breaker; the breaking capacity and the electric service life of the circuit breaker can be improved.

The utility model discloses a large current circuit breaker has adopted the width size design of the step face with step 35 of stationary contact connecting portion 34 to be less than the thickness size of stationary contact 31 with the thickening portion, some protrusions of stationary contact 31 with the thickening portion are in the step face of step 35 of stationary contact connecting portion 34 is out of the plane. The utility model discloses a this kind of structure, produced electric arc can remove along the arc portion of leading of static contact better when making the movable contact break off to realize quick arc extinguishing.

The foregoing is illustrative of the preferred embodiment of the present invention and is not to be construed as limiting the invention in any way. Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention. The technical solutions disclosed above can be used by those skilled in the art to make many possible variations and modifications, or to modify equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments by the technical entity of the present invention should fall within the protection scope of the technical solution of the present invention.

Claims (10)

1. A high-current circuit breaker comprises a shell, a moving contact, a fixed contact, an arc extinguish chamber and a lock catch, wherein the moving contact, the fixed contact, the arc extinguish chamber and the lock catch are arranged in the shell; the movable contact of the movable contact and the static contact of the static contact are respectively arranged at matched positions; the lock catch is positioned above the matching position of the moving contact and the static contact and is linked with the moving contact; the arc extinguish chamber is arranged at the bottom of the shell; in the static contact, a bent arc guide part is also arranged below the static contact in an extending manner; an arc striking plate is also arranged in the shell and is positioned at a position correspondingly matched with the arc guiding part, and an arc striking channel is formed between the arc striking plate and the arc guiding part; the method is characterized in that: the bottom of the lock catch also extends towards the direction of the matching position of the movable contact and the static contact to form a thickened part, so that when the lock catch is linked to disconnect the movable contact and the static contact, the thickened part of the lock catch moves above the matching position of the movable contact and the static contact to form a downward airflow to blow the electric arc generated by the disconnection between the movable contact and the static contact to accelerate the downward movement; in the arc striking plate, a straight plate structure is arranged at a position corresponding to the arc guiding part, so that the arc striking plate is closer to the position where the moving and static contacts generate electric arcs in the vertical distance, and a small slit is formed between the arc striking plate and the arc guiding part, thereby accelerating the electric arcs to move towards the arc extinguishing chamber.

2. The high current circuit breaker of claim 1, wherein: the thickened part at the bottom of the lock catch is close to the matching position of the movable contact and the static contact and keeps a tiny gap so as to form a movable retaining wall above the matching position of the movable contact and the static contact; when the lock catch is linked to disconnect the movable contact and the static contact, the thickened part at the bottom of the lock catch moves to the position above the matching position of the movable contact and the static contact, and the electric arc is prevented from moving upwards.

3. A high current circuit breaker according to claim 2, wherein: and a straight plate structure in the arc striking plate is obliquely arranged at a position opposite to the arc guiding part.

4. A high current circuit breaker according to claim 2, wherein: the circuit breaker further comprises two wiring terminals mounted at both ends of the length of the housing; the two wiring terminals are respectively electrically communicated with the moving contact and the fixed contact; the arc extinguish chamber is arranged below a passage through which one of the two wiring terminals is communicated with the fixed contact.

5. The high current circuit breaker of claim 4, wherein: the static contact also comprises a horizontal fixing part and a static contact connecting part; the horizontal fixing part is electrically communicated with one of the wiring terminals, the static contact connecting part is integrally connected between the horizontal fixing part and the arc conducting part, and the static contact is fixed in one surface of the static contact connecting part facing the direction of the moving contact; the static contact is at least provided with a thickened part for solving the temperature rise problem at the contact, and a thinning part is arranged in one surface of the static contact connecting part facing the direction of the moving contact, so that the distance between the dynamic contact and the static contact is ensured by utilizing the abdication of the thickening part of the static contact by the thinning part of the static contact.

6. The high current circuit breaker of claim 5, wherein: the reduced thickness portion of the stationary contact connecting portion enables the stationary contact connecting portion and the arc guide portion to form a step, and the stationary contact with the thickened portion is fixed on the step.

7. The high current circuit breaker of claim 6, wherein: the width dimension of the step surface of the step of the stationary contact connecting portion is the same as the thickness dimension of the stationary contact with the thickened portion, and the stationary contact with the thickened portion is completely fitted in the step surface of the step of the stationary contact connecting portion.

8. The high current circuit breaker of claim 6, wherein: the width dimension of the step surface of the step of the stationary contact connecting portion is smaller than the thickness dimension of the stationary contact with the thickened portion, and a part of the stationary contact with the thickened portion protrudes out of the step surface of the step of the stationary contact connecting portion.

9. The high current circuit breaker of claim 5, wherein: one of the connecting terminals is an inlet terminal, an electromagnetic release is further arranged in a passage where the inlet terminal is communicated with the fixed contact, and the electromagnetic release is arranged on the arc extinguish chamber.

10. The high current circuit breaker of claim 9, wherein: the other connecting terminal of the two connecting terminals is an outlet terminal, and a current transformer is further arranged in a connecting passage between the outlet terminal and the moving contact; and the outlet terminal passes through the magnetic core of the current transformer.

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