CN202616152U - An operating mechanism of a miniature circuit breaker - Google Patents

Abstract

The utility model relates to the technical field of circuit breakers, in particular to an operating mechanism of a miniature circuit breaker, which comprises a handle, a connecting rod, a push rod, a stop block, a support piece, a drive plate, a contact arm, a handle shaft and a pivot, wherein the handle shaft and the pivot are respectively fixed at the inner side of a shell of the miniature circuit breaker; the handle is arranged on a handle shaft, and the driving plate, the supporting piece and the push rod are sequentially arranged on the pivot shaft; the first end of the connecting rod is eccentrically hinged on the handle, and the second end of the connecting rod is hinged with the first end of the push rod; the stop block is hinged with the support piece through a fixed mandrel; the dog has been seted up the catch groove, and the second end and the catch groove cooperation of push rod are equipped with first torsion spring between drive plate and the support piece, and when the push rod drove the dog motion, the dog drove the support piece motion, and simultaneously, support piece drove the drive plate motion through first torsion spring. The utility model discloses a miniature circuit breaker's operating device simple structure, cost are lower, stability is better.

Description

An operating mechanism of a miniature circuit breaker

technical field

The utility model relates to the technical field of circuit breakers, in particular to an operating mechanism of a small circuit breaker.

Background technique

A miniature circuit breaker, also known as an automatic switch, is an electrical appliance that not only has the function of a manual switch, but also can automatically protect against voltage loss, undervoltage, overload, and short circuit. When a serious overload or short circuit occurs in the circuit, the circuit breaker can automatically cut off the circuit. Its function is equivalent to the combination of a fuse switch and an overheating relay, etc., and generally does not need to replace parts after breaking the fault, so it is obtained a wide range of applications.

Miniature circuit breakers are generally composed of thermal magnetic tripping devices, arc extinguishing systems, wiring systems, operating mechanisms, etc. The performance of the operating mechanism directly affects the function of the miniature circuit breaker. The existing small circuit breaker operating mechanism has many parts, complex structure and large tripping force, easy to slip after frequent operation, and poor stability. This operating mechanism not only increases the cost, but also is inconvenient in the production and installation process.

Utility model content

In order to solve the above problems, the utility model provides an operating mechanism of a small circuit breaker with simple structure, low cost and good stability.

An operating mechanism of a small circuit breaker, including a handle, a connecting rod, a push rod, a block, a support, a driving plate and a contact arm, and also includes a handle shaft and a pivot, and the handle shaft and the pivot are respectively fixed on a small Inside the enclosure of the circuit breaker;

The handle is installed on the handle shaft, and the drive plate, support member, and push rod are installed on the pivot in turn; the first end of the connecting rod is eccentrically hinged on the handle, and the second end of the connecting rod is connected to the handle. The first end of the push rod is hinged; one end of the support member is provided with a fixed mandrel, and the first end of the stopper is hinged with the support member through the fixed mandrel; the second end of the stopper is provided with a small circuit breaker The electromagnetic tripping device of the circuit breaker is matched with the touch boss. There is a blocking groove between the first end and the second end of the block. The second end of the push rod cooperates with the blocking groove. When the miniature circuit breaker is closed, the pushing The second end of the rod drives the block along the block groove and presses the block;

A first torsion spring is arranged between the drive plate and the support member, the first torsion spring is installed on the pivot, one end of the first torsion spring clamps the support member, and the other end of the first torsion spring clamps the drive plate;

The first end of the driving board is provided with a slot, the first end of the contact arm is fixed to the driving board through the slot, and the second end of the contact arm is provided with a moving contact;

When the push rod drives the stopper to move, the stopper drives the support to move through the fixed mandrel, and at the same time, the support drives the drive plate to move through the first torsion spring, and the moving contact of the contact arm moves toward the small circuit breaker along with the movement of the drive plate. The static contact movement of the device.

Wherein, the blocking groove is "W" shaped, and the second end of the push rod is provided with a first pressing block and a second pressing block matching with the blocking groove.

Wherein, the operating mechanism of the miniature circuit breaker further includes an elastic resistance member for preventing the stopper from sliding.

Wherein, the elastic resistance member is an elastic pressing rod, one end of the pressing rod is fixed to the first end of the block, and the other end of the pressing rod is in contact with the inner side of the case of the miniature circuit breaker.

Wherein, the elastic resistance member is a second torsion spring located between the stopper and the support member, the second torsion spring is installed on the fixed mandrel of the support member, and one end of the second torsion spring presses the protrusion of the stopper Block, the other end of the second torsion spring presses the protruding block of the support.

Wherein, the connecting rod is a bending rod bent at an obtuse angle, the bending rod includes a first rod connected with the handle, and a second rod connected with the push rod, and the length of the first rod is less than The length of the second rod.

Wherein, the second end of the driving board is provided with a state indicator indicating the state of the moving contact, and the state indicator includes a closed state indicator and a tripped state indicator.

Wherein, the operating mechanism also includes a pull rod, one end of the pull rod is hinged to the stopper, and the other end of the pull rod is located on the bimetal side of the miniature circuit breaker; when the overcurrent lasts for a period of time, the bimetal will deform , at this time, under the action of deformation force, the bimetal pushes the pull rod to move in the opposite direction of the static contact, and the pull rod drives the stopper to move until it trips.

Wherein, the operating mechanism further includes a resistance spring providing a part of the tripping force, the first end of the resistance spring is fixed to the side of the status indicator of the drive plate, and the other end is fixed to the inner side of the case of the miniature circuit breaker.

Wherein, the supporting member is further provided with a supporting member protrusion, and the driving plate is further provided with a driving plate protrusion; when the driving plate and the supporting member move, the supporting member protrusion and the driving plate protrusion touch and press each other.

The beneficial effects of the utility model are:

(1) The small circuit breaker operating mechanism of the utility model has fewer linkage parts, simple structure and low cost, and the support member and the driving plate are connected by the first torsion spring, so the stability is better;

(2) The second end of the push rod is provided with a first pressure-contact block and a second pressure-contact block that cooperate with the retaining groove. The design of the two pressure-contact blocks effectively reduces the sliding buckle caused by the frequent use of the operating mechanism. .

Description of drawings

Fig. 1 is a schematic diagram of the internal structure of a miniature circuit breaker applying the utility model.

Fig. 2 is a structural schematic diagram of the operating mechanism of the miniature circuit breaker of the present invention.

FIG. 3 is a schematic diagram of the structure in another direction of FIG. 2 .

Fig. 4 is a structural schematic diagram of a miniature circuit breaker applying the utility model.

The reference signs are explained as follows:

10—handle shaft; 11—handle;

12—connecting rod; 20—pivot;

21—push rod; 22—block;

23—support; 24—drive plate;

25—contact arm; 26—first torsion spring;

27—pressure rod; 28—pull rod;

29—resistance spring; 30—shell;

31—first terminal; 32—static contact;

33—the second terminal; 36—bimetal;

121—the first shot; 122—the second shot;

211—the first pressing block; 212—the second pressing block;

221—stop groove; 222—touch boss;

231—fixed mandrel; 232—support bump;

241—card slot; 242—status indicator;

243—closed state indicator; 244—tripped state indicator;

245—drive board bump; 251—moving contact;

341—electromagnetic coil; 342—moving iron core;

343—trip lever; 351—arc guide plate;

352—interrupter chamber; 353—insulation partition;

361—soft wire.

Detailed ways

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments.

Embodiment 1: Referring to Figures 1 to 4, an operating mechanism for a small circuit breaker includes a handle 11, a connecting rod 12, a push rod 21, a stopper 22, a support 23, a drive plate 24 and a contact arm 25, and It includes a handle shaft 10 and a pivot shaft 20, the handle shaft 10 and the pivot shaft 20 are respectively fixed inside the housing 30 of the miniature circuit breaker;

The handle 11 is installed on the handle shaft 10, the drive plate 24, the support member 23, and the push rod 21 are installed on the pivot 20 in turn; the first end of the connecting rod 12 is eccentrically hinged on the handle 11, and the The second end of the connecting rod 12 is hinged with the first end of the push rod 21; one end of the support member 23 is provided with a fixed mandrel 231, and the first end of the stopper 22 and the support member 23 pass through the fixed mandrel. The shaft 231 is hinged; the second end of the stop block 22 is provided with a touch boss 222 that cooperates with the electromagnetic tripping device of the miniature circuit breaker, and a stop groove 221 is opened between the first end and the second end of the stop block 22. The second end of the push rod 21 cooperates with the blocking groove 221. When the miniature circuit breaker is closed, the second end of the push rod 21 drives the block 22 to move along the blocking groove 221 and presses the block 22;

A first torsion spring 26 is arranged between the drive plate 24 and the support member 23, and the first torsion spring 26 is installed on the pivot 20, and one end of the first torsion spring 26 clamps the support member 23, and the first torsion spring 26 The other end of the clamping drive plate 24;

The first end of the driving board 24 is provided with a slot 241, the first end of the contact arm 25 is fixed to the driving board 24 through the slot 241, and the second end of the contact arm 25 is provided with a movable contact 251;

When the push rod 21 drives the stopper 22 to move, the stopper 22 drives the support member 23 to move through the fixed mandrel 231, and at the same time, the support member 23 drives the drive plate 24 to move through the first torsion spring 26, and the movable contact of the contact arm 25 251 moves toward the static contact 32 of the miniature circuit breaker along with the movement of the drive plate 24 .

Wherein, the blocking groove 221 is "W" shaped, and the second end of the push rod 21 is provided with a first pressure-contact block 211 and a second pressure-contact block 212 matched with the blocking groove 221 . When the first pressure-contact block 211 is tripped due to factors such as frequent operation, the second pressure-contact block 212 will provide a corresponding pressure-contact force to reduce the sliding between the push rod 21 and the retaining groove 221 .

Wherein, the operating mechanism of the miniature circuit breaker also includes an elastic resistance member to prevent the stopper 22 from sliding.

Wherein, the elastic resistance member is an elastic pressing rod 27, one end of the pressing rod 27 is fixed to the first end of the block 22, and the other end of the pressing rod 27 is in contact with the inner side of the housing 30 of the miniature circuit breaker. Depression bar 27 has played certain anti-skid buckle effect, and is easy to install.

Wherein, the connecting rod 12 is a bending rod bent at an obtuse angle, and the bending rod includes a first rod 121 connected with the handle 11, and a second rod 122 connected with the push rod 21. The length of the first rod 121 is smaller than the length of the second rod 122 . This design is beneficial to the linkage between the connecting rod 12 and the push rod 21 .

Wherein, the second end of the driving board 24 is provided with a status indicator 242 for displaying the status of the movable contact 251 , and the status indicator 242 includes a closed status indicator 243 and a tripped status indicator 244 . The position of the miniature circuit breaker housing 30 corresponding to the state indicator 242 has a corresponding small hole; the closed state indicator 243 is displayed with a green mark, and the tripped state indicator 244 is displayed with a red mark. Seeing the color corresponding to this state has a very intuitive indication effect.

Wherein, the operating mechanism also includes a pull rod 28, one end of the pull rod 28 is hinged to the stopper 22, and the other end of the pull rod 28 is located on the side of the bimetal 36 of the miniature circuit breaker; when the overcurrent lasts for a period of time, The bimetal 36 will be deformed. At this time, under the action of the deforming force, the bimetal 36 pushes the pull rod 28 to move in the opposite direction of the static contact 32, and the pull rod 28 drives the stopper 22 to move until it trips.

Wherein, the operating mechanism also includes a resistance spring 29 that provides a part of the tripping force. The first end of the resistance spring 29 is fixed to the side of the status indicator 242 of the drive plate 24, and the other end is fixed to the housing 30 of the miniature circuit breaker. inside. When the miniature circuit breaker needs to be tripped due to a fault, the resistance spring 29 can provide an appropriate tripping force, effectively avoiding accidents.

Wherein, the support member 23 is also provided with a support member protrusion 232, and the drive plate 24 is also provided with a drive plate protrusion 245; when the drive plate 24 and the support member 23 move, the support member protrusion 232 and the drive plate protrusion 245 touch each other.

The small circuit breaker using the operating mechanism of the utility model includes a housing 30, a static contact 32, an electromagnetic tripping device, an arc extinguishing mechanism, an operating mechanism, and a first terminal 31 and a second terminal 33 fixed to the housing; The contact 251 is electrically connected to the second terminal 33;

The electromagnetic tripping device includes an electromagnetic coil 341, a moving iron core 342 and a tripping rod 343. The static contact 32 is electrically connected to the first terminal 31 through the electromagnetic coil 341. The moving iron core 342 is located in the electromagnetic coil 341 and can be positioned relative to the The electromagnetic coil 341 enters and exits, that is, the moving iron core 342 can move in the inner cavity of the electromagnetic coil 341 , and the tripping rod 343 is fixed in the moving iron core 342 , and the tripping rod 343 is arranged in cooperation with the touching boss 222 of the block 22 .

The arc extinguishing mechanism includes an arc guiding plate 351 connected to the second terminal 33, and an arc extinguishing chamber 352 connected to the arc guiding plate 351. An insulating partition 353 is provided on the inner surface of the arc guiding plate 351 close to the fixed contact 32. The arc guiding plate 351 and the arc extinguishing chamber 352 are fixed in the casing, and the arc guiding plate 351 is arranged in a direction corresponding to the arc drawing when the moving contact 251 and the static contact 32 are disconnected.

Wherein, the miniature circuit breaker further includes a bimetal 36 electrically connected to the second terminal 33 , and the movable contact 251 is electrically connected to the bimetal 36 through a flexible wire 361 .

After the overcurrent lasts for a period of time, the bimetal strip 36 will bend toward the second terminal post 33. At this time, under the action of deformation force, the bimetal strip 36 pushes the pull rod 28 to move toward the second terminal post 33, and the pull rod 28 drives The block 22 moves until it trips, and the movable contact 251 is disconnected from the static contact 32, thereby realizing the overcurrent protection function.

When a short-circuit fault occurs in the miniature circuit breaker, the current increases rapidly, and the moving iron core 342 in the electromagnetic tripping device generates electromagnetic force under the magnetic field of the electromagnetic coil 341, and the electromagnetic force pushes the tripping rod 343 to instantly push the contact protrusion of the stopper 22. The platform 222 makes the trip between the block 22 and the push rod 21, and the movable contact 251 and the static contact 32 are disconnected, thereby realizing the short-circuit protection function.

When the moving contact 251 is disconnected from the static contact 32, the generated arc spark is introduced into the arc extinguishing chamber 352 by the arc guide plate 351, and its energy is reduced. In addition, the setting of the insulating partition 353 ensures that the miniature circuit breaker Fast arc extinguishing and safe use.

Embodiment two:

The difference between this embodiment and Embodiment 1 is that the elastic resistance member is a second torsion spring arranged between the block 22 and the support member 23, and the second torsion spring is installed on the fixed mandrel of the support member 23 231 , one end of the second torsion spring presses the protruding block of the stopper 22 , and the other end of the second torsion spring presses the protruding block of the support member 23 . The second torsion spring acts on the stopper 22 and the support member 23, effectively avoiding easy slipping between the stopper 22 and the push rod 21, the design is simple, and the blocking effect is good.

The beneficial effects of the utility model are:

(1) The small circuit breaker operating mechanism of the utility model has fewer linkage parts, simple structure, and low cost. The support member 23 and the driving plate 24 are connected by the first torsion spring 26, and the stability is better;

(2) The second end of the push rod 21 is provided with a first pressure-contact block 211 and a second pressure-contact block 212 that cooperate with the stop groove 221. The design of the two pressure-contact blocks effectively reduces the frequent use of the operating mechanism. caused by slippage.

The above content is only a preferred embodiment of the present utility model. For those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation and scope of application. The content of this specification should not be understood as Limitations on the Invention.

Claims (10)

1. the operating mechanism of a miniature circuit breaker is characterized in that: comprise handle, connecting rod, push rod, block, strutting piece, drive plate and contact point arm, also comprise Handle axis and pivot, it is inboard that said Handle axis and pivot are individually fixed in the shell of miniature circuit breaker;

Said handle is installed on the Handle axis, and said drive plate, strutting piece, push rod are installed on the pivot successively; The first end off-centre of said connecting rod is articulated on the handle, and second end of said connecting rod and first end of said push rod are hinged; Said strutting piece one end is provided with stationary spindle, and first end of said block and said strutting piece are hinged through stationary spindle; Second end of block is provided with the shake-up boss that cooperates with the electromagnetic tripping apparatus of miniature circuit breaker; Offer retaining groove between first end of block and second end; Second end of said push rod cooperates with retaining groove; When closed miniature circuit breaker, second end of push rod drives block along retaining groove and moves and compress block;

Be provided with first torsion spring between said drive plate and the strutting piece, said first torsion spring is installed on pivot, and an end of first torsion spring blocks strutting piece, and the other end of first torsion spring blocks drive plate;

First end of said drive plate is provided with draw-in groove, and first end of said contact point arm is fixed in drive plate through draw-in groove, and second end of said contact point arm is provided with moving contact;

When push rod drove the block motion, block passed through stationary spindle and drives support movements, and simultaneously, strutting piece drives the drive plate motion through first torsion spring, and the moving contact of contact point arm is along with the motion of drive plate is moved to the fixed contact of miniature circuit breaker.

2. the operating mechanism of a kind of miniature circuit breaker according to claim 1, it is characterized in that: said retaining groove is " W " type, second end of said push rod be provided with cooperate with said retaining groove first press contact block and second to press contact block.

3. the operating mechanism of a kind of miniature circuit breaker according to claim 1 is characterized in that: the operating mechanism of said miniature circuit breaker also comprises the elasticity resistor of anti-stop block slide fastener.

4. the operating mechanism of a kind of miniature circuit breaker according to claim 3; It is characterized in that: said elasticity resistor is the rubber-like depression bar; Said depression bar one end is fixed in first end of block, and the shell inboard of the other end of said depression bar and miniature circuit breaker touches.

5. the operating mechanism of a kind of miniature circuit breaker according to claim 3; It is characterized in that: said elasticity resistor is for being located at second torsion spring between block and the strutting piece; Said second torsion spring is installed on the stationary spindle of strutting piece; One end of second torsion spring is pushed down the protrusion piece of block, and the other end of second torsion spring is pushed down the protrusion piece of strutting piece.

6. the operating mechanism of a kind of miniature circuit breaker according to claim 3; It is characterized in that: said connecting rod is a bending bent rod in obtuse angle; Said bent rod comprises first bar that is connected with handle; And second bar that is connected with push rod, the length of said first bar is less than the length of second bar.

7. the operating mechanism of a kind of miniature circuit breaker according to claim 3 is characterized in that: second end of said drive plate is provided with the state indicateing arm that shows the moving contact state, and said state indicateing arm comprises closure state indicateing arm and trip status indicateing arm.

8. the operating mechanism of a kind of miniature circuit breaker according to claim 3, it is characterized in that: said operating mechanism also comprises a pull bar, and said pull bar one end and said block are hinged, and the other end of pull bar is positioned at bimetal leaf one side of miniature circuit breaker; After overcurrent continues a period of time, bimetallic sector-meeting distortion, this moment, the bimetal leaf pushing drawing rod was to the opposite direction motion of fixed contact under the effect of deformation force, and pull bar drives the block motion until dropout.

9. the operating mechanism of a kind of miniature circuit breaker according to claim 7; It is characterized in that: said operating mechanism also comprises the resistance spring that a part of tripping force is provided; Said resistance spring first end is fixed in the side of the state indicateing arm of drive plate, and the other end is fixed in the shell inboard of miniature circuit breaker.

10. according to the operating mechanism of each described a kind of miniature circuit breaker of claim 1 to 9, it is characterized in that: said strutting piece also is provided with the strutting piece projection, and said drive plate also is provided with the drive plate projection; When drive plate and support movements, strutting piece projection and drive plate projection press each other.

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