CN204424190U - A kind of miniature circuit breaker - Google Patents

Abstract

The utility model relates to a kind of miniature circuit breaker, it comprises: shell, electromagnetic tripping apparatus, overload tripping device and handle, U-shaped connecting rod, tripping, fixed contact, movable contactor, jointed shaft, energy-stored spring, described movable contactor comprises snap close, support and moving contact, described support is positioned on shell by jointed shaft, be provided with the first jointed shaft, tripping is socketed on the first jointed shaft, and centered by this jointed shaft, circuit oscillation; Support is provided with the second jointed shaft, snap close is socketed on the second jointed shaft, snap close has the extension that forms interlocking structure when contacting with tripping, the convex exhibition portion of the first position limiting structure is formed when contacting with boss with one, snap close is provided with return unit, has the restoring force driving snap close to swing to boss direction, only adopts tripping, snap close and support, realize the connection between this three without the need to excessive parts, make structure compacter and simple.

Description

A small circuit breaker

technical field

The utility model relates to a circuit breaker, in particular to a small circuit breaker.

Background technique

A miniature circuit breaker is a circuit device used to close or break circuits for small electric equipment such as appliances in rooms, buildings, and factories to protect the circuits from abnormal currents such as overload and short-circuit Impact.

Installing multiple miniature circuit breakers in the distribution board, using multiple miniature circuit breakers in the distribution board, accordingly, opening and closing mechanisms with small size and simple structure and arc suppression mechanisms for miniature circuit breakers have been required .

Traditional opening and closing mechanisms for small circuit breakers have complex structures and troublesome assembly processes. As shown in Figure 9, the switch mechanism for small molded case circuit breakers disclosed in Chinese patent CN102044384 shows the various components of the switch assembly and the mutual assembly process, which consists of five or six components passing through each other. Respectively matched and assembled into a switch assembly, and then packed into a small plastic case.

Utility model content

In order to overcome the disadvantages of complex structure and cumbersome assembly of the opening and closing mechanism, the utility model provides a small circuit breaker.

The technical solution adopted by the utility model is: a small circuit breaker, which includes: a casing, an electromagnetic tripping device, an overload tripping device and a handle, which provides a manual operation of the small circuit breaker to the opening position or closing position. Brake position mode; U-shaped link, one end of which is connected to the handle; jumper, which is connected to the other end of the U-shaped link and swings by the mechanical force transmitted by the U-shaped link; fixed a contactor, which is electrically connected to a power source or a load of a power circuit; a movable contactor, which swings to a position of or apart from said fixed contactor to close or break said circuit, said movable contactor One end of the contactor is connected to the jumper so as to form a linkage with the jumper; the hinged shaft, after passing through the movable contactor, is sleeved on the bushing arranged on the shell, and after the three are matched, it is constituted as During the period when the movable contactor swings to close or break the circuit and the movable contactor is not in contact with the fixed contactor, it provides a fulcrum for swinging; an energy storage spring, during the opening process of the miniature circuit breaker , to provide the movable contactor to swing along the hinge shaft to break the restoration force of the circuit; the movable contactor includes a lock, a bracket and a moving contact, and the bracket is positioned on the housing through the hinge shaft, and a first hinge is provided shaft, the jumper is sleeved on the first hinge shaft, and swings around the hinge shaft as the center; the bracket is provided with a second hinge shaft, the lock catch is sleeved on the second hinge shaft, and the lock buckle has a The protruding part that forms the interlocking structure when the jumper is in contact with the boss, and a protrusion that forms the first limit structure when it contacts the boss. force; the moving contact and the bracket form a linkage cooperation, and the moving contact is driven by the bracket to swing along the hinge shaft.

After the hinged shaft passes through the boss, it is sleeved on the shaft sleeve arranged on the shell, and the three are compatible.

The first hinge shaft is arranged on the bracket.

The reset member is a first torsion spring.

One end of the first torsion spring is placed in a slot provided on the upper surface of the lock, and the other end is locked on a component that is displaced relative to the lock when the lock swings.

The part is a slot provided on the end surface of the second hinge shaft.

The slot and the card slot form a certain angle.

The protruding portion constitutes a second position-limiting structure when in contact with the boss.

The bracket is provided with a third hinge shaft, and the movable contact is sleeved on the third hinge shaft.

A locking structure is formed between the moving contact and the support when swinging clockwise.

A second torsion spring is sheathed on the third hinge shaft, one end of the second torsion spring is against the boss, and one end of the second torsion spring is connected to the movable contact.

A groove is provided on the boss, and the second torsion spring is placed in the groove against the end of the boss (627).

One end of the energy storage spring is against the shell, and the other end is against the projection provided on the side wall of the bracket.

An arc groove is arranged on the surface of the bracket, and the arc groove is matched with the end of the U-shaped connecting rod passing through the jumper.

The housing is provided with an arc-shaped slot for connecting the first insertion hole on the lock catch with other components to form a linkage fit.

The electromagnetic tripping device includes an electromagnetic coil, a push rod placed in the electromagnetic coil, and a plane part arranged on the buckle. The push rod and the plane part constitute the opening position, the first state where the two are not in contact, and the closing position. Gate position, the second state where the two are in contact.

The overload release device includes a double gold piece and a bent connecting rod. One end of the bent connecting rod is movably inserted into the second insertion hole provided on the lock buckle, and the other end is placed on the side of the double gold piece.

The beneficial effect of the utility model is that: the opening and closing structure of the miniature circuit breaker is mainly composed of jumpers, locks and brackets. When assembling, the three parts can be socketed first, and then loaded into the miniature circuit breaker. , you can also directly install the bracket, lock, and jumper into the miniature circuit breaker in sequence. No matter which installation method is used, the connection between the two can be realized through socketing, and the installation is very convenient; further, only Using jumpers, locks and brackets, there is no need for extra parts to realize the connection between the three, making the structure more compact and simple.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a schematic diagram of the shell of the utility model.

Fig. 3 is a perspective view of the movable contactor of the present invention.

Fig. 4 is a perspective view of the bracket and the moving contact of the utility model.

Fig. 5 is a perspective view of the bracket and the moving contact of the utility model.

FIG. 6 is an enlarged view of A in FIG. 3 .

FIG. 7 is an enlarged view at B in FIG. 5 .

1-shell, 11-arc slot, 12-shaft sleeve, 2-handle, 3-U-shaped connecting rod, 4-jumper, 5-fixed contactor, 6-movable contactor, 61-lock, 611 -Protruding part, 612-Convex part, 613-First torsion spring, 614-Catch slot, 615-First insertion hole, 616-Plane part, 617-Second insertion hole, 62-Bracket, 621- The first hinge shaft, 622-the second hinge shaft, 6221-slotted, 623-the third hinge shaft, 624-the second torsion spring, 625-arc groove, 626-bump, 627-boss, 63-moving Contact, 7-hinge shaft, 71-groove, 8-energy storage spring, 91-electromagnetic coil, 92-ejector, 100-double gold piece, 101-bent connecting rod.

Detailed ways

Below in conjunction with accompanying drawing, the utility model embodiment is further described:

As shown in Figures 1 and 3, a miniature circuit breaker includes: a casing 1, an electromagnetic tripping device, an overload tripping device and a handle 2, which provides a way to manually operate the miniature circuit breaker to the opening position or Closing position mode; U-shaped link 3, one end of which is connected to the handle 2; jumper 4, which is connected to the other end of the U-shaped link 3, and is transmitted by the U-shaped link 3 The mechanical force swings; the fixed contactor 5, which is electrically connected to the power supply or the load of the power circuit; the movable contactor 6, which swings to the position of the fixed contactor 5 or a position separated from the fixed contactor 5 for closing Or to disconnect the circuit, one end of the movable contactor 6 is connected to the jumper 4 so as to form a linkage with the jumper 4; the hinge shaft 7, which passes through the movable contactor 6, is sleeved on the shell On the shaft sleeve 12, after the three are matched, it is configured so that when the movable contactor 6 swings to close or break the circuit and when the movable contactor 6 is not in contact with the fixed contactor 5, Provide a swinging fulcrum; energy storage spring 8, in the opening process of the miniature circuit breaker, provide the movable contactor 6 to swing along the hinge shaft 7 to break the restoring force of the circuit; the movable contactor 6 includes a lock 61. Bracket 62 and moving contact 63. The bracket 62 is positioned on the housing 1 through the hinge shaft 7, and is provided with a first hinge shaft 621. The jumper 4 is sleeved on the first hinge shaft 621, and the hinge shaft center, swinging in the circumferential direction; the second hinge shaft 622 on the bracket, the lock catch 61 is sleeved on the second hinge shaft 622, the lock catch 61 has a protruding part 611 that forms an interlocking structure when it contacts with the jumper buckle 4, and A protruding portion 612 that forms a first limit structure when in contact with the boss 627, a reset member is provided on the lock catch 61, and has a restoring force that drives the lock catch 61 to swing in the direction of the boss 627; the movable contact 63 and the bracket 62 It constitutes linkage cooperation, and the movable contact 63 is driven by the bracket 62 to swing along the hinge shaft 7. The opening and closing structure of the small circuit breaker is composed of the jumper 4, the lock 61 and the bracket 62 as the main components. The three are socketed and then put into the miniature circuit breaker. You can also directly install the bracket 62, lock 61 and jumper 4 into the miniature circuit breaker in sequence. No matter which installation method is used, it can be done by socketing The connection between the two is very convenient for installation; further, only the jumper 4, the lock 61 and the bracket 62 are used, and no redundant parts are needed to realize the connection between the three, making the structure more compact and simple.

The hinged shaft 7 passes through the boss 627 and is sleeved on the sleeve 12 provided on the housing 1, and the three are compatible, so that the boss 627 and the hinged shaft 7 are coaxially matched, and the matched Relatively the most stable, of course, if necessary, it can also be set as an eccentric shaft, that is, as long as the hinge shaft 7 runs through the bracket 62, it can be realized to use the hinge shaft 7 as a fulcrum to drive the swing of the bracket 62. At this time, the boss 627 only uses As part of the limit structure.

As shown in Figures 1 and 6, during the closing process of the miniature circuit breaker, the handle 2 swings, and the U-shaped connecting rod 3 drives the jumper 4 to swing counterclockwise. The parts 611 are interlocked, so when the jumper 4 swings, it drives the lock 61 to swing clockwise. When the lock 61 swings to the position where the protrusion 612 of the lock 61 contacts the boss 627, the lock 61 continues Swing, drive the boss 627 to rotate, and because the boss 627 is arranged on the bracket 62, so drive the bracket 62 to swing, because the locking structure when the movable contact 63 and the bracket 62 swings clockwise is formed, so the bracket 62 The movable contact 63 can be driven to swing, and finally the movable contact 63 is contacted with the fixed contactor 5, and the miniature circuit breaker is switched on and energized.

As shown in Figure 5 and Figure 7, the bracket 62 is provided with a third hinge shaft 623, the movable contact 63 is sleeved on the third hinge shaft 623, and the second torsion spring 624 is sleeved on the third hinge shaft 623 One end of the second torsion spring 624 is against the boss 627, and one end is connected to the movable contact 63. In order to make the second torsion spring 624 more stable, a groove for engaging the second torsion spring 624 is provided on the boss 627 , when the miniature circuit breaker is closed, that is, when the moving contact 63 is in contact with the fixed contactor 5, the second torsion spring 624 allows the bracket 62 to swing clockwise to a certain position relative to the moving contact 63, so that the moving contact 63 It fits more closely with the fixed contactor 5, that is to say, the movable contact 63 has a certain overtravel; and when the miniature circuit breaker is opened, the elastic force of the second torsion spring 624 will make the movable contact 63 return to The initial mating position of the moving contact 63 and the bracket 62 .

As shown in Figure 1, during the opening process of the miniature circuit breaker, the handle 2 swings, and the jumper 4 is driven to swing clockwise through the U-shaped connecting rod 3. At this time, the jumper 4 and the lock 61 are unlocked, and one end is against the shell 1. The other end presses against the energy storage spring 8 on the bump 626 on the side wall of the bracket 62 to release the elastic force, so that the bracket 62 swings counterclockwise, and the bracket 62 drives the moving contact 63 to swing, finally making the moving contact 63 contact with the fixed When the breaker 5 is separated, the miniature circuit breaker is switched off and power is lost. During the opening process, when the bracket 62 swings to the position where the boss 627 contacts the protruding portion 612 of the lock 61, the bracket 62 continues to swing, driving the lock 61 to follow the bracket. 62 swing synchronously, that is, return to the initial state.

As shown in Figure 4, an arc groove 625 is provided on the surface of the bracket 62, and the arc groove 625 is adapted to the end of the U-shaped connecting rod 3 that runs through the jumper 4. When the small circuit breaker is opened, the U-shaped connecting rod 3 drives the jumper 4 to swing clockwise, and the arc groove 625 is set as a limit for the U-shaped connecting rod 3, which limits the transitional swing of the U-shaped connecting rod 3 driving the jumper 4, resulting in the jumper 4 not being able to Return, the end of the arc is the limit position for the displacement of the U-shaped connecting rod 3, and at this time the jumper 4 and the lock 61 are already in the unlocked state.

One end of the reset member is placed in the slot 614 provided on the upper surface of the lock 61, and the other end is locked in the first torsion spring 613 on a component that is relatively displaced with the lock 61 when the lock 61 swings. The torsion spring 613 has an elastic force, which acts on the lock catch 61 constantly, so that the lock catch 61 is always in the position where the protrusion 612 of the lock catch 61 is in contact with the boss 627 under the action of no other force. On the one hand, when the miniature circuit breaker is in the closed state, the lock 61 is under the action of the elastic force, and the jumper 4 is under the action of the U-shaped connecting rod 3, the interlock between the lock 61 and the jumper 4 is more stable, prevent accidental unlocking; on the other hand, during the opening process of the miniature circuit breaker, at the moment of unlocking, the protrusion 612 of the lock 61 and the boss 627 will have a momentary non-contact state, but the lock will be locked immediately. Under the action of the elastic force, 61 immediately returns to the position where the protrusion 612 of the latch 61 is in contact with the boss 627, and swings with the support 62, preparing for the next closing of the miniature circuit breaker.

As shown in Figure 3, in order to facilitate fixing, a slot 6221 is provided on the surface of the component, and the slot 6221 can be set on any fixed component in the miniature circuit breaker, as long as the component is in contact with the lock when the lock catch 61 swings. Buckle 61 can be provided with a relative displacement. Preferably, the slot 6221 is arranged on the end surface of the second hinge shaft 622, especially when the second hinge shaft 622 is arranged on the bracket 62, so that the latch 61 and the bracket 62 The structure between them is more compact, the processing of the slot 6221 is more convenient, and the assembly of the first torsion spring 613 is also more convenient.

As shown in FIG. 1 , overload tripping protection and short-circuit tripping protection are both provided in the miniature circuit breaker, wherein the overload tripping is realized by the double metal sheet 100 , and the short-circuit tripping is realized by the electromagnetic coil 91 .

The overload release device includes a double gold piece 100 and a bent connecting rod 101, one end of the bent connecting rod 101 is movably inserted into the second insertion hole 617 provided on the lock catch 61, and the other end is placed in the double gold On the side of the sheet 100, only when the miniature circuit breaker is in an overload state, the double metal sheet 100 is overheated and deformed, contacts with the curved connecting rod 101, and drives the curved connecting rod 101, causing the curved connecting rod 101 to swing counterclockwise. The rod 101 is plugged into the lock catch 61, which will drive the lock catch 61 to swing, thereby realizing the transient unlocking of the lock catch 61 and the jumper catch 4, and then under the action of the energy storage spring 8, the bracket 62 will move along the reverse direction. The hour hand swings, and drives the jumper 4 to swing, and finally drives the U-shaped connecting rod 4 to swing, the handle 2 to the opening position, and the miniature circuit breaker is in the opening state to protect the miniature circuit breaker from damage.

The electromagnetic tripping device includes an electromagnetic coil 91, a push rod 92 placed in the electromagnetic coil 91, and a plane part 616 arranged on the buckle. The push rod 92 and the plane part 616 constitute the opening position, and the two are not in contact with each other. The first state, and the closing position, the second state in which the two are in contact; when the miniature circuit breaker is in a short-circuit state, the electromagnetic coil 91 is energized, so that the ejector rod 92 placed in the electromagnetic coil 91 pops out, because the ejector rod 92 It is in contact with the flat part 616, so the ejector rod 92 will rotate counterclockwise against the flat part 616 when it pops up, so as to realize the instantaneous unlocking of the lock 61 and the jumper 4, and then under the action of the energy storage spring 8, make The bracket 62 swings counterclockwise, and drives the jumper 4 to swing, and finally drives the U-shaped connecting rod 4 to swing, and the handle 2 reaches the opening position, and the miniature circuit breaker is in the opening state, so as to protect the miniature circuit breaker from damage.

In the process of overload tripping and electromagnetic tripping, in addition to a force exerted by the energy storage spring 8 on the bracket 62, when the protruding part 611 of the lock catch 61 contacts the boss 627, the two constitute the second limit structure, so that the swing of the latch 61 will also generate a force acting on the boss 627 to drive the bracket 62 to swing counterclockwise. The opening time speeds up the opening process of the miniature circuit breaker, thereby protecting the miniature circuit breaker from damage in time. At the same time, after the opening process is completed, the bracket 62 is no longer subject to the previous two forces. At this time, the first torsion spring 613 The elastic force of the lock buckle 61 plays a major role, making the lock buckle 61 swing clockwise to the position where the protrusion 612 of the lock buckle 61 contacts the boss 627, so as to prepare for the next closing.

The first hinge shaft 621, the second hinge shaft 622 and the third hinge shaft 623 are respectively used for the connection between the jumper 4 and the bracket 62, the lock 61 and the bracket 62, the moving contact 63 and the bracket 62, these 3 The three hinged shafts can be directly arranged on the shell 1. When assembling, directly install the jumper 4, the lock 61 and the bracket 62 on the shell 1 in order. Preferably, these three hinged shafts are arranged on the bracket 62. On the other hand, it can better realize the mutual cooperation between the jumper 4 and the bracket 62, the lock 61 and the bracket 62, the moving contact 63 and the bracket 62 when swinging. Of course, being arranged on the bracket 62 can make the overall structure more compact. Processing is also more convenient.

As shown in Figure 2, the housing 1 is provided with an arc-shaped slot 11 for connecting the first insertion hole 615 on the lock catch 61 with other components such as two small circuit breakers to form a linkage fit, so as to satisfy implement other functions.

The embodiments described above in conjunction with the accompanying drawings are only preferred implementations of the present utility model, rather than limiting the scope of protection of the present utility model. Any improvements made based on the spirit of the present utility model should fall within the scope of protection of the present utility model .

Claims (17)

1. a miniature circuit breaker, it comprises: shell (1), electromagnetic tripping apparatus, overload tripping device and

Handle (2), it provides miniature circuit breaker described in a kind of manual operation to the mode of open position or closing position;

U-shaped connecting rod (3), its one end is connected to described handle (2);

Tripping (4), it is connected to the other end of described U-shaped connecting rod (3), and is swung by the mechanical force transmitted by described U-shaped connecting rod (3);

Fixed contact (5), it is electrically connected to the load of power supply or power circuit;

Movable contactor (6), its position being rocked to described fixed contact (5) or the position that separates with described fixed contact (5) are so that closed or disconnect described circuit, and one end of described movable contactor (6) is connected to described tripping (4) to form with described tripping (4) and is linked;

Jointed shaft (7), be socketed on the axle sleeve (12) that is arranged on shell (1) after running through movable contactor (6), after three is suitable, be configured to swing with closed or open circuit at described movable contactor (6) and during described movable contactor (6) does not contact with described fixed contact (5), provide the fulcrum of swing;

Energy-stored spring (8), in described miniature circuit breaker separating brake process, provides movable contactor (6) to swing along jointed shaft (7) with the restoring force disconnecting described circuit;

It is characterized in that: described movable contactor (6) comprises snap close (61), support (62) and moving contact (63), described support (62) is positioned on shell (1) by jointed shaft (7),

Be provided with the first jointed shaft (621), tripping (4) is socketed on the first jointed shaft (621), and centered by this jointed shaft, circuit oscillation;

Support (62) is provided with the second jointed shaft (622), snap close (61) is socketed on the second jointed shaft (622), snap close (61) has the extension (611) that forms interlocking structure when contacting with tripping (4), the convex exhibition portion (612) of the first position limiting structure is formed when contacting with the boss be arranged on support (627) with one, snap close (61) is provided with return unit, has the restoring force that driving snap close (61) swings to boss (627) direction;

Moving contact (63) and support (62) form and are linked, and are swung along jointed shaft (7) by support (62) drive moving contact (63).

2. a kind of miniature circuit breaker according to claim 1, is characterized in that: described jointed shaft (7) is socketed in after running through boss (627) on the axle sleeve (12) that is arranged on shell (1), and three is suitable.

3. a kind of miniature circuit breaker according to claim 1, is characterized in that: described first jointed shaft (621) is arranged on support (2).

4. a kind of miniature circuit breaker according to claim 1 or 3, is characterized in that: described return unit is the first torsion spring (613).

5. a kind of miniature circuit breaker according to claim 4, it is characterized in that: described first torsion spring (613) one end is placed in the draw-in groove (614) being located at snap close (61) upper surface, other end holding when snap close (61) swings and snap close exist on the parts of relative displacement.

6. a kind of miniature circuit breaker according to claim 5, is characterized in that: described parts are for being arranged on the flat recess (6221) of the end surfaces of the second jointed shaft (622).

7. a kind of miniature circuit breaker according to claim 6, is characterized in that: described flat recess (6221) and described draw-in groove (614) structure form an angle.

8. a kind of miniature circuit breaker according to claim 1, is characterized in that: form the second position limiting structure when described extension (611) contacts with boss (627).

9. a kind of miniature circuit breaker according to claim 1, is characterized in that: be provided with the 3rd jointed shaft (623) at support (62), and described moving contact (63) is socketed on the 3rd jointed shaft (623).

10. a kind of miniature circuit breaker according to claim 9, is characterized in that: form locking structure during clockwise oscillation between described moving contact (63) and support (62).

11. a kind of miniature circuit breakers according to claim 9, is characterized in that: upper sheathed second torsion spring (624) of the 3rd jointed shaft (623), the second torsion spring (624) one end is against boss (627), and one end connects moving contact (63).

12. a kind of miniature circuit breakers according to claim 11, is characterized in that: on boss (627), be provided with groove, and the second torsion spring (624) is placed in groove against this end of boss (627).

13., according to a kind of miniature circuit breaker in claim 5-12 described in arbitrary, is characterized in that: described energy-stored spring (8) one end is against shell (1), and the other end is against the projection (626) be arranged on support (62) sidewall.

14., according to a kind of miniature circuit breaker in claim 5-12 described in arbitrary, is characterized in that: be provided with one section of arc groove (625) on support (62) surface, and this end that this arc groove (625) and U-shaped connecting rod (3) run through tripping (4) is suitable.

15., according to a kind of miniature circuit breaker in claim 5-12 described in arbitrary, is characterized in that: described shell (1) is provided with and is connected to form the arc-shaped slot (11) be linked with miscellaneous part for the first spliced eye (615) on snap close (61).

16. according to a kind of miniature circuit breaker in claim 5-12 described in arbitrary, it is characterized in that: described electromagnetic tripping apparatus comprises solenoid (91), is placed in the push rod (92) of solenoid (91) and is arranged on the planar portions (616) on snap close (61), described push rod (92) and planar portions (616) form open position, both discontiguous first states, and closing position, the second state that both contact.

17. according to a kind of miniature circuit breaker in claim 5-12 described in arbitrary, it is characterized in that: described overload tripping device comprises two gold plaque (100) and curved rod (101), mobilizable being plugged in described curved rod (101) one end is arranged in upper second spliced eye (617) of snap close (61), and the other end is placed in two gold plaque (100) side.