CN220774258U - Short-circuit instant air-blowing breaking mechanism of plastic casing circuit breaker - Google Patents
Short-circuit instant air-blowing breaking mechanism of plastic casing circuit breaker Download PDFInfo
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- CN220774258U CN220774258U CN202322237535.8U CN202322237535U CN220774258U CN 220774258 U CN220774258 U CN 220774258U CN 202322237535 U CN202322237535 U CN 202322237535U CN 220774258 U CN220774258 U CN 220774258U
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- air
- ejector rod
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- 230000007246 mechanism Effects 0.000 title claims abstract description 61
- 238000007664 blowing Methods 0.000 title claims abstract description 40
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000010891 electric arc Methods 0.000 abstract description 4
- 230000009471 action Effects 0.000 description 5
- 230000000670 limiting effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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Abstract
The utility model relates to a short-circuit instant air-blowing breaking mechanism of a low-voltage molded case circuit breaker, which comprises three groups of unit boxes which are sequentially arranged from left to right, wherein an operating mechanism is arranged at the top of a middle unit box, and an air-blowing mechanism is arranged between adjacent unit boxes; the air blowing mechanism comprises air outlet holes arranged on opposite sides of the adjacent unit boxes, and U-shaped elastic sheets are pressed between the unit boxes at the air outlet holes; a push rod is arranged above the U-shaped elastic sheet, and the push rod moves up and down relative to the two unit boxes for assembly; the upper part of the ejector rod is opposite to a convex arm formed by laterally extending an operating mechanism; when the circuit breaker is short-circuited, strong electric arc is generated by free gas, the gas flow acts on the bottom of the ejector rod upwards after rushing out of the unit box, the ejector rod is pushed to move upwards, the top end of the ejector rod contacts with and pushes the convex arm on the operating mechanism upwards, and the circuit breaker is promoted to be disconnected rapidly; therefore, arc airflow generated by short circuit is effectively utilized, and force is applied to the operating mechanism through the airflow, so that the circuit breaker short circuit self-driven active and quick breaking is achieved, and the reliable use of the circuit breaker is greatly ensured.
Description
Technical Field
The utility model relates to the technical field of circuit breakers, in particular to a short-circuit instant air-blowing breaking mechanism of a low-voltage molded case circuit breaker.
Background
Low voltage circuit breakers, also known as automatic air switches, can be used to switch on and off a load circuit, and also to control an infrequently started motor.
In the existing low-voltage circuit breaker, a free tripping mechanism is generally arranged and is used for realizing the protection function of the circuit breaker under the conditions of overload, short circuit, undervoltage and the like; for example, when a circuit is short-circuited or severely overloaded, the armature of the overcurrent release is attracted to enable the free release mechanism to act, and the main contact is disconnected with the main circuit to realize a protection function.
However, in the existing process of realizing the protection function of the circuit breaker through the action of the free tripping mechanism, the dynamic contact and the static contact are driven to separate by the electric repulsive force generated under high current, so that the problems of action delay and incapability of timely disconnection exist, the arc extinction is incomplete, and the normal use of the circuit breaker is affected.
Disclosure of Invention
The applicant provides a short-circuit instant air-blowing breaking mechanism of a low-voltage molded case circuit breaker with reasonable structure aiming at the defects in the prior art, thereby effectively utilizing arc airflow generated by short circuit, and applying force to an operating mechanism timely and rapidly through the airflow to realize active and rapid breaking of the circuit breaker by self-driving of the short circuit, and greatly ensuring the reliable use of the circuit breaker.
The technical scheme adopted by the utility model is as follows:
the short-circuit instant air-blowing breaking mechanism of the low-voltage molded case circuit breaker comprises three groups of unit boxes which are sequentially arranged from left to right, wherein an operating mechanism is arranged at the top of the middle unit box, and an air-blowing mechanism is arranged between adjacent unit boxes;
the structure of the air blowing mechanism is as follows: the U-shaped elastic sheet is pressed between the adjacent unit boxes at the air outlet holes; a push rod is commonly arranged between two adjacent unit boxes above the U-shaped elastic sheet, and the push rod moves up and down relative to the two unit boxes for assembly; the upper part of the ejector rod is opposite to a convex arm formed by laterally extending an operating mechanism.
As a further improvement of the above technical scheme:
the side pieces at two sides of the U-shaped elastic piece are respectively attached to the outer hole of the corresponding air outlet.
The outer side surface of the unit box is provided with a containing cavity for containing and assembling the side pieces, the outer side surface of the unit box above the containing cavity is provided with a cavity for assembling and moving the ejector rod, and a through groove is formed between the middle part of the top surface of the containing cavity and the cavity.
The bottom ends of the two side plates in the U-shaped elastic sheet are connected through a horizontal bottom plate, the front end and the rear end of the bottom plate are outwards protruded out of the side plates, and the bottom plate is clamped in the clamping groove.
The inner bottom surface of the accommodating cavity extends upwards to form more than two protruding points, and the protruding points are propped against the bottom surface of the U-shaped elastic sheet bottom sheet.
The middle part of the cavity extends inwards to form an upper cavity and a lower cavity, the ejector rod comprises a rod body, the top surface and the bottom surface of the rod body extend outwards along the circumferential direction to form an upper flange and a lower flange, the upper flange is positioned in the upper cavity, the lower flange is positioned in the lower cavity, and the partition plate is provided with a groove which penetrates through the rod body up and down; the top surface of the rod body extends upwards to form a rod part, and the rod part is positioned below the convex arm; the outside of the unit box above the upper cavity is provided with a vertical groove which is upwardly and upwardly penetrated and extends to be provided with a rod part.
The top of the rod part is bent and extended to form an inclined part, and the convex arm is positioned right above the upward inclined surface in the inclined part.
The air blowing mechanism further comprises U-shaped frames with upward openings, and U-shaped grooves for the U-shaped frames to be assembled are respectively formed in opposite side surfaces of the adjacent unit boxes; the U-shaped elastic piece and the ejector rod are both positioned on the inner side of the U-shaped frame.
An elastic piece is arranged between the ejector rod and the unit box.
The ejector rod is upwards extended to form a convex column, a convex block is laterally extended from the outer side surface of the unit box above the convex column, the bottom end of the elastic piece is sleeved on the convex column, and the top end of the elastic piece is abutted under the convex block; an inner concave arc-shaped groove is formed in the outer side face of the unit box below the protruding block, and the elastic piece is accommodated in the inner concave arc-shaped groove.
The beneficial effects of the utility model are as follows:
the utility model has compact and reasonable structure and convenient operation, when the circuit breaker is short-circuited, the gas is dissociated to generate strong electric arc by arranging the air blowing mechanism between the adjacent unit boxes, the air flow acts on the bottom of the ejector rod upwards after rushing out of the unit boxes to push the ejector rod to move upwards, the top end of the ejector rod contacts with and pushes the convex arm on the operating mechanism upwards, and the circuit breaker is promoted to be disconnected rapidly; the arc airflow generated by the short circuit is effectively utilized, and the air flow is applied to the operating mechanism, so that the active and quick breaking of the circuit breaker by self-driving of the short circuit is achieved, and the reliable use of the circuit breaker is greatly ensured;
the utility model also has the following advantages:
after the air flow is punched out through the air outlet holes on the side wall of the unit box, the air flow upwards flows through the constraint restriction of the interval between the side piece and the unit box, and the air flow is upwards pushed to apply force to the ejector rod after being limited by the through groove, so that the reliable guiding and limiting effects on the air flow are effectively ensured.
Drawings
Fig. 1 is a schematic structural view of the low voltage molded case circuit breaker of the present utility model.
Fig. 2 is an exploded view of fig. 1.
FIG. 3 is a schematic view showing the installation of the blowing mechanism of the present utility model on the side wall of the unit case.
Fig. 4 is a schematic view of the structure of the unit case of the present utility model at the side wall for assembling the air blowing mechanism.
Fig. 5 is an exploded view of the air-blowing mechanism of the present utility model.
Fig. 6 is a schematic structural view of the ejector pin according to the present utility model.
Fig. 7 is a schematic structural diagram of a U-shaped spring according to the present utility model.
Wherein: 1. an operating mechanism; 2. a unit case; 3. an air blowing mechanism;
11. a protruding arm;
20. an air outlet hole; 21. a bump; 22. a U-shaped groove; 23. a receiving chamber; 24. a through groove; 25. a lower cavity; 26. an upper chamber; 27. a concave arc-shaped groove; 231. a clamping groove; 232. a bump; 251. a partition plate; 261. a vertical groove;
31. a U-shaped elastic sheet; 32. a U-shaped frame; 33. a push rod; 34. an elastic member;
330. a lower flange; 331. a lever body; 332. an upper flange; 333. a convex column; 334. a stem portion; 335. an inclined portion;
311. a negative; 312. side panels.
Detailed Description
The following describes specific embodiments of the present utility model with reference to the drawings.
As shown in fig. 1 and 2, the short-circuit instantaneous air-blowing breaking mechanism of the low-voltage molded case circuit breaker of the embodiment comprises three groups of unit boxes 2 which are sequentially arranged from left to right, an operating mechanism 1 is arranged at the top of the middle unit box 2, and an air-blowing mechanism 3 is arranged between the adjacent unit boxes 2;
as shown in fig. 3, 4 and 5, the air blowing mechanism 3 has the following structure: the U-shaped elastic sheet 31 is pressed between the adjacent unit boxes 2 positioned at the air outlet holes 20; a push rod 33 is commonly arranged between two adjacent unit boxes 2 above the U-shaped elastic sheet 31, and the push rod 33 moves up and down relative to the two unit boxes 2 for assembly; the ejector rod 33 faces the protruding arm 11 formed by laterally extending the operating mechanism 1.
By arranging the air blowing mechanism 3 between the adjacent unit boxes 2, when the circuit breaker is short-circuited, strong electric arc is generated by free air, the air flow acts on the bottom of the ejector rod 33 upwards after rushing out of the unit boxes 2, the ejector rod 33 is pushed to move upwards, the top end of the ejector rod 33 contacts with and pushes the convex arm 11 on the operating mechanism 1 upwards, and the circuit breaker is promoted to be opened quickly; therefore, the arc airflow generated by the short circuit is effectively utilized, and the arc airflow is applied to the operating mechanism 1 through the airflow force, so that the circuit breaker short circuit self-driven active and quick breaking is achieved.
As shown in fig. 7, the side pieces 312 on both sides of the U-shaped elastic piece 31 are respectively attached to the outer openings of the corresponding air outlet holes 20; the air flow that has been blown out of the air outlet holes 20 causes the side pieces 312 to deform in a direction away from the air outlet holes 20, and the air flow flows upward between the side pieces 312 and the outer wall surface of the unit case 2 after having been blown out of the air outlet holes 20.
Through the arrangement of the U-shaped elastic sheet 31, the same air blowing mechanism 3 is shared between the two unit boxes 2 at intervals, so that the structure is compact, reasonable and ingenious, and the triggering action of the air blowing mechanism 3 is effectively ensured; when a short circuit occurs in any unit box 2, the ejector rod 33 can be pushed upwards after the air is exhausted through the corresponding air outlet holes 20, and due to the arrangement of the U-shaped elastic pieces 31 between the air outlet holes 20 of the adjacent unit boxes 2, the air flow during the short circuit can only flow upwards along the deformed side surfaces of the U-shaped elastic pieces 31, so that the air flow is guided, and the air flows cannot be affected mutually due to the arrangement of the air outlet holes 20 on the adjacent unit boxes 2.
The outer side surface of the unit box 2 is provided with a containing cavity 23 for containing and assembling the side piece 312, the outer side surface of the unit box 2 above the containing cavity 23 is provided with a cavity for assembling and moving the ejector rod 33, and a through groove 24 is formed between the middle part of the top surface of the containing cavity 23 and the cavity in a penetrating way; the air flows upward through the through slots 24 and pushes the ejector pins 33 in the cavity upward.
After the air flow is flushed out through the air outlet holes 20 on the side wall of the unit box 2, the air flow upwards flows through the constraint restriction of the interval between the side piece 312 and the unit box 2, and is upwards pushed to apply force to the ejector rod 33 after being limited by the through groove 24, so that the reliable guiding and limiting effects on the air flow are effectively ensured, and the pushing effect of the air flow on the ejector rod 33 is ensured.
The bottom ends of the accommodating cavities 23 extend towards the front and the back to form clamping grooves 231 respectively, the bottom ends of two side plates 312 in the U-shaped elastic plate 31 are connected through a horizontal bottom plate 311, the front end and the rear end of the bottom plate 311 are outwards protruded out of the side plates 312, and the bottom plate 311 is clamped in the clamping grooves 231, so that the U-shaped elastic plate 31 between the adjacent unit boxes 2 and the air outlet holes 20 can be assembled quickly and reliably.
In the actual use process, in order to ensure the usability of the U-shaped elastic sheet 31, the outer side surfaces of the two side pieces 312 of the U-shaped elastic sheet 31 are respectively attached to the accommodating cavities 23 on the corresponding unit boxes 2, that is, the side pieces 312 are urged to abut against the orifice surfaces of the air outlet holes 20 by the elastic force of the U-shaped elastic sheet 31.
The inner bottom surface of the accommodating cavity 23 extends upwards to form more than two protruding points 232, the protruding points 232 are propped against the bottom surface of the bottom sheet 311 of the U-shaped elastic sheet 31, and the protruding points 232 are matched with the clamping grooves 231 in the height direction, so that the reliability and stability of the assembly of the U-shaped elastic sheet 31 on the outer side surface of the unit box 2 are effectively ensured.
As shown in fig. 6, the ejector rod 33 comprises a rod body 331, the top surface and the bottom surface of the rod body 331 extend outwards along the circumferential direction to form an upper flange 332 and a lower flange 330, the upper flange 332 is positioned in the upper cavity 26, the lower flange 330 is positioned in the lower cavity 25, and the baffle 251 is provided with a groove which penetrates through the rod body 331 up and down; the upper and lower chambers 26, 25 serve as guide and movement limit for the up and down movement of the jack 33.
The top surface of the rod body 331 extends upwards to form a rod part 334, and the rod part 334 is positioned below the convex arm 11, so that the rod part 334 can push and apply force to the convex arm 11 upwards along with the passive upward movement of the ejector rod 33, and the operating mechanism 1 is further promoted to act; the unit case 2 located above the upper chamber 26 has a vertical groove 261 extending upwardly therethrough for fitting the lever portion 334, the vertical groove 261 providing a guiding function for the up-and-down movement of the lever portion 334.
The top of the rod portion 334 is bent and extended to form an inclined portion 335, and the protruding arm 11 is located right above the upward inclined surface in the inclined portion 335, so that the reliability of pushing the pushing rod 33 to the protruding arm 11 above is effectively ensured through the arrangement of the inclined portion 335.
The air blowing mechanism 3 further comprises U-shaped frames 32 with upward openings, and U-shaped grooves 22 for the U-shaped frames 32 to be assembled are respectively formed in opposite side surfaces of the adjacent unit boxes 2; the U-shaped elastic piece 31 and the ejector rod 33 are both positioned on the inner side of the U-shaped frame 32.
The arrangement of the U-shaped frame 32 forms a relatively closed acting space for the air blowing mechanism 3 so as to ensure effective and reliable use of air flow, and meanwhile, the U-shaped frame 32 also realizes structural protection for the air blowing mechanism 3 and structural connection between adjacent unit boxes 2 at the air blowing mechanism 3.
An elastic piece 34 is arranged between the ejector rod 33 and the unit box 2, and after the air flow thrust is dissipated, the ejector rod 33 descends and resets under the action of the elastic piece 34.
The ejector rod 33 is upwards extended to form a convex column 333, a convex block 21 is laterally extended on the outer side surface of the unit box 2 above the convex column 333, the bottom end of the elastic piece 34 is sleeved on the convex column 333, and the top end of the elastic piece 34 is abutted under the convex block 21; an inner concave arc groove 27 is formed on the outer side surface of the unit box 2 below the convex block 21, and the elastic piece 34 is accommodated in the inner concave arc groove 27.
The application principle of the utility model is as follows:
when the circuit breaker is in short circuit, the gas in the unit box 2 is dissociated to generate strong electric arc, the air flow laterally rushes out of the unit box 2 through the air outlet hole 20, after the U-shaped elastic sheet 31 side piece 312 abutting against the orifice is deformed, the air flow upwards acts on the bottom of the ejector rod 33 after being limited by the through groove 24, the ejector rod 33 is pushed to move upwards relative to the unit box 2, the top end of the ejector rod 33 contacts and pushes the convex arm 11 on the operating mechanism 1 upwards, and the circuit breaker is promoted to be disconnected rapidly; at this time, the elastic member 34 is compressed; after the airflow thrust is dissipated, the ejector rod 33 is restored downwards under the action of the elastic piece 34.
According to the utility model, the air blowing mechanism 3 is assembled between the side wall surfaces of two adjacent unit boxes 2, so that the effective use of short-circuit airflow is realized, the self-driven active and quick breaking of the circuit breaker during short circuit is realized, the reliable use of the circuit breaker is greatly ensured, and the structure is compact and reasonable.
The above description is intended to illustrate the utility model and not to limit it, the scope of which is defined by the claims, and any modifications can be made within the scope of the utility model.
Claims (10)
1. The utility model provides a short-circuit instantaneous air-blowing breaking mechanism of a low-voltage molded case circuit breaker which characterized in that: the device comprises three groups of unit boxes (2) which are sequentially arranged from left to right, wherein an operating mechanism (1) is arranged at the top of the middle unit box (2), and an air blowing mechanism (3) is arranged between adjacent unit boxes (2);
the structure of the air blowing mechanism (3) is as follows: comprises air outlet holes (20) arranged on the opposite side surfaces of adjacent unit boxes (2), and U-shaped elastic sheets (31) are pressed between the adjacent unit boxes (2) positioned at the air outlet holes (20); an ejector rod (33) is commonly arranged between two adjacent unit boxes (2) above the U-shaped elastic sheet (31), and the ejector rod (33) moves up and down relative to the two unit boxes (2) for assembly; the top of the ejector rod (33) is opposite to a convex arm (11) formed by laterally extending the operating mechanism (1).
2. The short-circuit instantaneous air-blowing breaking mechanism of the low-voltage molded case circuit breaker according to claim 1, wherein: the side pieces (312) on the two sides of the U-shaped elastic piece (31) are respectively attached to the outer hole of the corresponding air outlet hole (20).
3. The short-circuit instantaneous air-blowing breaking mechanism of the low-voltage molded case circuit breaker according to claim 2, wherein: the outer side surface of the unit box (2) is provided with a containing cavity (23) for containing and assembling side pieces (312), the outer side surface of the unit box (2) above the containing cavity (23) is provided with a cavity for containing and assembling an ejector rod (33) and moving, and a through groove (24) is formed between the middle part of the top surface of the containing cavity (23) and the cavity in a penetrating way.
4. A low voltage molded case circuit breaker short circuit instantaneous air-blowing breaking mechanism as claimed in claim 3 wherein: the bottom ends of the accommodating cavity (23) extend towards the front and the back to form clamping grooves (231), the bottom ends of the two side plates (312) in the U-shaped elastic sheet (31) are connected through the horizontal bottom plate (311), the front end and the rear end of the bottom plate (311) are outwards protruded out of the side plates (312), and the bottom plate (311) is clamped in the clamping grooves (231).
5. The short-circuit instantaneous air-blowing breaking mechanism of the low-voltage molded case circuit breaker according to claim 4, wherein: the inner bottom surface of the accommodating cavity (23) extends upwards to form more than two protruding points (232), and the protruding points (232) are propped against the bottom surface of the bottom sheet (311) of the U-shaped elastic sheet (31).
6. A low voltage molded case circuit breaker short circuit instantaneous air-blowing breaking mechanism as claimed in claim 3 wherein: the middle part of the cavity is internally extended with a baffle plate (251) to be divided into an upper cavity (26) and a lower cavity (25), the ejector rod (33) comprises a rod body (331), the top surface and the bottom surface of the rod body (331) are respectively extended outwards along the circumferential direction to form an upper flange (332) and a lower flange (330), the upper flange (332) is positioned in the upper cavity (26), the lower flange (330) is positioned in the lower cavity (25), and the baffle plate (251) is provided with a groove which is penetrated up and down and is matched with the rod body (331); the top surface of the rod body (331) extends upwards to form a rod part (334), and the rod part (334) is positioned below the convex arm (11); a vertical groove (261) for assembling the rod part (334) is arranged on the outer side of the unit box (2) above the upper cavity (26) in a penetrating way.
7. The short-circuit instantaneous air-blowing breaking mechanism of the low-voltage molded case circuit breaker according to claim 6, wherein: the top of the rod part (334) is bent and extended to form an inclined part (335), and the convex arm (11) is positioned right above the upward inclined surface in the inclined part (335).
8. The short-circuit instantaneous air-blowing breaking mechanism of the low-voltage molded case circuit breaker according to claim 1, wherein: the air blowing mechanism (3) further comprises U-shaped frames (32) with upward openings, and U-shaped grooves (22) for the U-shaped frames (32) to be assembled are respectively formed in opposite side surfaces of the adjacent unit boxes (2); the U-shaped elastic piece (31) and the ejector rod (33) are both positioned at the inner side of the U-shaped frame (32).
9. The short-circuit instantaneous air-blowing breaking mechanism of the low-voltage molded case circuit breaker according to claim 1, wherein: an elastic piece (34) is arranged between the ejector rod (33) and the unit box (2).
10. The low voltage molded case circuit breaker short circuit instantaneous air-blowing breaking mechanism of claim 9, wherein: a convex column (333) is formed on the ejector rod (33) in an upward extending mode, a convex block (21) is laterally extended from the outer side face of the unit box (2) above the convex column (333), the bottom end of the elastic piece (34) is sleeved on the convex column (333), and the top end of the elastic piece (34) is abutted to the lower portion of the convex block (21); the outer side surface of the unit box (2) positioned below the convex block (21) is provided with a concave arc-shaped groove (27), and the elastic piece (34) is accommodated in the concave arc-shaped groove (27).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322237535.8U CN220774258U (en) | 2023-08-18 | 2023-08-18 | Short-circuit instant air-blowing breaking mechanism of plastic casing circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322237535.8U CN220774258U (en) | 2023-08-18 | 2023-08-18 | Short-circuit instant air-blowing breaking mechanism of plastic casing circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220774258U true CN220774258U (en) | 2024-04-12 |
Family
ID=90598419
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322237535.8U Active CN220774258U (en) | 2023-08-18 | 2023-08-18 | Short-circuit instant air-blowing breaking mechanism of plastic casing circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220774258U (en) |
-
2023
- 2023-08-18 CN CN202322237535.8U patent/CN220774258U/en active Active
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