CN108321055A - A kind of breaker of plastic casing with residual current protecting - Google Patents

Abstract

The invention discloses a molded case circuit breaker with residual current protection, which comprises a base, a handle, a draw bar and a leakage release; the handle and the draw bar are installed on the base respectively; the leakage release adopts The magnetic flux converter is the driving element for tripping, and the leakage release and the handle are installed side by side on the same side of the base relative to the draw bar. On the contrary, it is the same as the load buckle direction of the circuit breaker. The invention makes the leakage protection accurate, rapid and reliable through structural improvement, the product is small in size and compact in structure, and the leakage indication is not easy to be jammed.

Description

A Molded Case Circuit Breaker with Residual Current Protection

technical field

The invention relates to the technical field of circuit breakers, in particular to a molded case circuit breaker with residual current protection.

Background technique

A circuit breaker refers to a switching device that can close, carry and break current under normal circuit conditions and can close, carry and break current under abnormal circuit conditions within a specified time.

Ordinary molded case circuit breakers only have short circuit (commonly known as instantaneous, short delay), overload (commonly known as delay, long delay), and do not have leakage protection functions. Leakage circuit breakers (standards are called circuit breakers with residual current protection) In addition to short circuit (commonly known as instantaneous, short time delay), overload (commonly known as time delay, long time delay), there is also a leakage protection function. Therefore, the leakage circuit breaker is usually equipped with a leakage release to disconnect the connection between the power supply circuit and the load when the load has leakage.

The current leakage release of the mainstream molded case circuit breaker with residual current protection on the market usually adopts the traditional electromagnet pull-in structure. The working voltage of the coil is AC380V. The voltage is large and cannot be energized for a long time. Leakage function fails. And the tripping indication of leakage is realized by sliding between the transmission pull rod and the reset indication button, which is more prone to jamming.

In the prior art, there are also some leakage releases that use flux converters, but most of them are applied to releases of electronic circuit breakers, and the function of residual current detection is added as an accessory. And the installation position of the magnetic flux converter on the electronic circuit breaker is mostly installed on the other end that the handle pushes, and in the middle is the draw bar of the whole circuit breaker (playing the on-off function). In this way, the volume of the circuit breaker is large and the structure is not compact.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art and provide a molded case circuit breaker with residual current protection, which uses a flux converter as the leakage release, and improves the structure to make the leakage protection accurate, rapid and effective. Reliable, the product is small in size and compact in structure, and the leakage indicator is not easy to jam.

The technical solution adopted by the present invention to solve the technical problem is: a molded case circuit breaker with residual current protection, including a base, a handle, a draw bar and a leakage release; the handle and the draw bar are respectively installed on the base Above; the leakage release adopts a magnetic flux converter as the tripping drive element, and the leakage release and the handle are installed side by side on the same side of the base relative to the draw bar, and the extension of the push rod of the magnetic flux converter The direction is opposite to the tripping movement direction of the push rod, and is the same as the tripping direction of the circuit breaker.

There is also a rotary push rod linked with the handle between the handle and the leakage release, and the rotary push rod is also matched with the push rod of the magnetic flux converter. The push rod drives the push rod of the magnetic flux converter to move in the extending direction.

The rotary push rod is provided with a notch formed by double convex parts; the first convex part is provided on the push rod of the magnetic flux converter; The convex part of the push rod cooperates with the first convex part of the push rod, and the rotation of the push rod drives the push rod of the magnetic flux converter to move in the extending direction.

The leakage release also includes a release seat, a connecting rod, a jumper lock assembly, a release cover, a reset button and a reset spring, and the magnetic flux converter and the jumper lock assembly are respectively installed on the release On the buckle seat, the push rod of the magnetic flux converter is matched with the lock parts in the jumper lock assembly; the connecting rod is fixed on the push rod of the magnetic flux converter; the tripper cover is fixed on the release On the release seat; the reset button is installed on the release cover through the return spring and cooperates with the connecting rod to realize the trip indication.

The connecting rod and the push rod are integrally structured.

The rotary push rod is installed at a position matched with the jumper lock assembly of the leakage release. When the handle is pulled in the direction of the load buckle, the handle touches the leakage release through the convex part on the other side of the notch of the rotary push rod. The action of the jumper part of the jumper lock assembly of the buckle implements the loading of the buckle.

The jumper lock assembly is installed at a position matched with the drawbar, and the jumper lock assembly realizes the separation or contact of the dynamic and static contacts of the molded case circuit breaker through the drawbar.

The connecting rod is provided with a through hole, and the through hole is provided with a high and low step surface, and the high step surface is in the extension direction of the push rod relative to the low step surface, and there is a slope transition between the high step surface and the low step surface; the reset The side of the button is provided with a second protrusion extending into the through hole of the connecting rod. When the earth leakage release generates a tripping action, the second protrusion of the reset button cooperates with the high step surface of the through hole of the connecting rod.

The side of the tripper base is provided with a first mounting hole, the rotary push rod is pivotally connected to the side of the tripper seat through the first mounting hole, and the side of the rotary push rod is provided with a The third protrusion, the handle drives the rotary push rod to rotate through the third protrusion.

The earth leakage tripper also includes a circuit board and a fixing board, and the circuit board and the fixing board are respectively installed on the tripper seat and located under the tripper cover.

The side of the release base is also provided with a fourth protrusion facing the rotary push rod.

Compared with prior art, the beneficial effect of the present invention is:

1. The present invention adopts the magnetic flux converter as the driving element for tripping, and the leakage release and the handle are installed side by side on the same side of the base relative to the draw bar. The extension direction of the push rod of the magnetic flux converter is the same as The direction of the tripping movement of the push rod is opposite, which is the same as that of the circuit breaker. The structure of the present invention, on the one hand, uses the magnetic flux converter instead of the electromagnet to pull in, the working voltage is only 5V/12V/24V weak current control, the coil will not be burned even if it is energized for a long time, and the magnetic flux converter responds quickly and reliably On the other hand, the installation method of the magnetic flux converter makes it occupy a relatively small space, which is conducive to the miniaturization and compact design of the product.

2. The present invention adopts a rotating push rod interlocked with the handle between the handle and the leakage release, and the rotating push rod is provided with a notch, and a first push rod is provided on the push rod of the magnetic flux converter. Convex portion: utilize the notch of rotating push rod to cooperate with the first convex portion of push rod, when the handle is pulled toward the buckle loading direction, the handle drives the push rod of the magnetic flux converter to move toward the extending direction by rotating the push rod. This structure of the present invention can decompose the load buckle force of the handle into two parts, one part acts on the reset of the push rod of the release (overcoming the spring force on the magnetic flux converter, which is relatively small), and the other part realizes the load Buckle function (multi-stage transmission), which reduces the force acting on the push rod and protects the life of the parts.

3. The present invention adopts the connecting rod and the push rod as an integral structure, and the connecting rod is provided with a through hole, and the through hole is provided with a high and low step surface, and the high step surface is at the extension of the push rod relative to the low step surface. In the outgoing direction, there is a slope transition between the high step surface and the low step surface; a second protrusion extending into the through hole of the connecting rod is provided on the side of the reset button. The structure of the present invention enables the movement of the magnetic flux converter to directly act on the indicator without passing through other intermediate components, so the structure is simple and the jamming phenomenon is not easy to occur.

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, a molded case circuit breaker with residual current protection of the present invention is not limited to the embodiments.

Description of drawings

Fig. 1 is the three-dimensional structure schematic diagram of the embodiment of the present invention;

Fig. 2 is an exploded schematic diagram of a three-dimensional structure of an embodiment of the present invention;

Fig. 3 is a schematic diagram of cooperation between the leakage release and the drawbar of the present invention;

Fig. 4 is an exploded schematic view of the three-dimensional structure of the leakage release of the present invention;

Fig. 5 is an exploded perspective view of the three-dimensional structure of the leakage release (rotating in one direction) of the present invention;

Fig. 6 is a schematic diagram of the cooperation between the earth leakage release and the rotary push rod of the present invention;

Fig. 7 is the synoptic diagram that the leakage release of the present invention cooperates with the rotary push rod (opposite side);

Fig. 8 is a schematic diagram of the push rod of the leakage release of the present invention cooperating with the jumper lock assembly (loaded buckle state);

Fig. 9 is a schematic diagram of the cooperation between the push rod and the trip lock assembly (tripped state) of the leakage release of the present invention;

Fig. 10 is a schematic diagram of cooperation (tripping state) of the push rod, the jumper lock assembly and the rotary push rod of the leakage release of the present invention;

Fig. 11 is a schematic diagram of the cooperation of the push rod, the jumper lock assembly and the rotary push rod of the leakage release of the present invention (lock-loaded state).

Detailed ways

Example

Referring to Figures 1 to 11, a molded case circuit breaker with residual current protection according to the present invention includes a base 1, a handle 2, a draw bar 4 and a leakage release 3; the handle 2 and draw bar 4 respectively installed on the base 1; the leakage release 3 adopts a magnetic flux converter 31 as a tripping drive element, and the leakage release 3 and the handle 2 are installed side by side on the same side of the base 1 relative to the drawbar 4 On the side, the extension direction of the push rod 311 of the magnetic flux converter 31 is opposite to the tripping movement direction of the push rod 311, and is the same as the tripping direction of the circuit breaker. The push rod 311 of the magnetic flux converter 31 is connected with the moving iron core of the magnetic flux converter 31 .

Between the handle 2 and the leakage release 3 is also equipped with a rotary push rod 5 linked with the handle 2, and the rotary push rod 5 is provided with a notch 51 composed of double convex parts; on the push rod 311 of the magnetic flux converter There is a first protrusion 312; the notch 51 of the rotating push rod matches the first protrusion 312 of the push rod, when the handle 2 is pulled in the direction of the buckle, the protrusion on the side of the notch 51 of the rotating push rod The first convex part 312 of the push rod is matched with the first convex part 312 of the push rod, and the push rod 311 of the magnetic flux converter is driven to move in the extending direction by rotating the push rod 5 . That is, the rotation of the handle 2 drives the rotary push rod 5 to rotate, and when the rotary push rod 5 rotates, the notch 51 drives the first convex portion 312 to move, and the first convex portion 312 drives the push rod 311 to move.

The leakage release 3 also includes a release seat 32, a connecting rod 33, a trip lock assembly 34, a release cover 35, a reset button 36 and a return spring 37, and the magnetic flux converter 31 and the jumper The buckle lock assembly 34 is installed on the tripper seat 32 respectively, and the push rod 311 of the magnetic flux converter is matched with the lock parts in the jumper lock assembly 34; the connecting rod 33 is fixed on the magnetic flux converter. on the push rod 311; the tripper cover 35 is fixed on the tripper seat 32; the reset button 36 is installed on the tripper cover 35 through the return spring 37 and cooperates with the connecting rod 33 to realize the release buckle instructions.

In this embodiment, the connecting rod 33 and the pushing rod 311 are integrally structured.

In this embodiment, the rotating push rod 5 is installed at a position matched with the jumper lock assembly 34 of the leakage release. The convex part on the other side of the mouth touches the jumper part of the jumper lock assembly 34 of the leakage release to act to realize the load buckle.

The jumper lock assembly 34 is installed at a position matched with the drawbar 4 , and the jumper lock assembly 34 realizes the separation or contact of the dynamic and static contacts of the molded case circuit breaker through the drawbar 4 . In this embodiment, a protrusion is provided on the draw bar 4 , and the protrusion on the draw bar 4 is matched with the head of the lock component in the jumper lock assembly 34 .

In this embodiment, the connecting rod 33 is provided with a through hole 331, and the through hole 331 is provided with a high and low step surface. It is a slope (or arc surface) transition between the low step surface 333; the side of the reset button 36 is provided with a second convex portion 361 extending into the through hole 331 of the connecting rod 33, when the leakage release 3 is released When the buckle is in action, the second protrusion 361 of the reset button 36 matches the high step surface 332 of the through hole of the connecting rod. The low step surface 333 of the through hole of the rod cooperates.

In this embodiment, the side of the release base 32 is provided with a first installation hole 321, and the rotating push rod 5 is pivotally connected to the side of the release base 32 through the first installation hole 321. The side of the handle 2 is provided with a third convex portion 52 matched with the handle 2, and the handle 2 drives the rotary push rod 5 to rotate through the third convex portion 52.

The leakage release 3 also includes a circuit board 38 and a fixing plate 39 , the circuit board 38 and the fixing plate 39 are installed on the release base 32 and under the release cover 35 respectively. Specifically, the fixing plate 39 is used to fix the magnetic flux converter 31 installed on the release base 32 to prevent the magnetic flux converter 31 from loosening, and the circuit board 38 is guided by the coil on the magnetic flux converter 31. The feet are fixed by welding.

The side of the release base 32 is further provided with two fourth protrusions 322 facing the rotating push rod. The function of the fourth convex part 322 is to prevent the rotary push rod from contacting the seat surface of the release during the rotation movement. By setting two fourth convex parts 322 to space them apart to leave a gap, prevent the surface contact from being stuck ; The reason for setting two is to ensure the balance when the rotary push rod moves.

When the present invention is in the load buckle state, the push rod 311 of the leakage release 3 cooperates with the trip lock assembly 34, so that the dynamic and static contacts of the molded case circuit breaker are locked in the closing position. At this time, the reset button 36 The second protrusion 361 fits on the lower step surface 333 of the connecting rod 33, and the reset button 36 is in a compressed state; when a leakage current occurs, the flux converter works, and the pushing rod 311 of the flux converter is driven by the action of the iron core Move to the opposite direction of extension, the push rod 311 of the magnetic flux converter makes the tripping part in the trip lock assembly 34 act, and tripping occurs, and the trip lock assembly 34 makes the molded case circuit breaker The dynamic and static contacts are disconnected; when it needs to be reconnected, pull the handle 2, the handle 2 rotates, the handle 2 drives the rotating push rod 5 to rotate through the third convex part 52 of the rotating push rod 5, and the rotating push rod 5 turns the handle 2 The load buckle force is decomposed into two parts, one part is matched with the first convex part 312 of the push rod by rotating the notch 51 of the push rod to reset the push rod 311 of the release, and the other part is matched with the jumper lock by rotating the push rod 5 The cooperation of the buckle assembly 34 realizes the closing of the dynamic and static contacts.

A molded case circuit breaker with residual current protection of the present invention adopts a magnetic flux converter 31 as a tripping drive element, and the leakage tripper 3 and the handle 2 are installed side by side on the base 1 relative to the drawbar 4 On the same side, the protruding direction of the push rod 311 of the magnetic flux converter 31 is opposite to the tripping direction of the push rod 311 and the same as the tripping direction of the circuit breaker. In this structure of the present invention, on the one hand, the magnetic flux converter 31 is used instead of the electromagnet to pull in, the working voltage is only 5V/12V/24V weak current control, the coil will not be burned even if it is energized for a long time, and the magnetic flux converter responds quickly, High reliability; on the other hand, the installation method of the magnetic flux converter makes it occupy a relatively small space, which is conducive to the miniaturization and compact design of the product.

A molded case circuit breaker with residual current protection of the present invention adopts a rotary push rod 5 linked with the handle 2 between the handle 2 and the leakage release 3, and the rotary push rod 5 is provided with a concave Opening 51, a first protrusion 312 is provided on the push rod 311 of the magnetic flux converter; use the notch 51 of the rotating push rod to cooperate with the first protrusion 312 of the push rod, when the handle 2 is pulled in the direction of the buckle , the handle 2 drives the push rod 311 of the magnetic flux converter to move in the extending direction by rotating the push rod 5 . This structure of the present invention can decompose the load buckle force of the handle 2 into two parts, one part acts on the reset of the push rod 311 of the release (to overcome the spring force on the magnetic flux converter, which is relatively small), and the other part Realize the buckle function (multi-stage transmission), which reduces the force acting on the push rod and protects the life of the parts.

A molded case circuit breaker with residual current protection of the present invention adopts an integral structure of the connecting rod 33 and the push rod 311, and a through hole 331 is provided on the connecting rod 33, and a high and low step surface is arranged in the through hole. , the high step surface 332 is in the extension direction of the push rod 311 relative to the low step surface 333, and the transition between the high step surface 332 and the low step surface 333 is a slope; The second protrusion 361 of the through hole 331 . The structure of the present invention enables the movement of the magnetic flux converter to directly act on the indicator without passing through other intermediate components, so the structure is simple and the jamming phenomenon is not easy to occur.

The above are only preferred embodiments of the present invention, and do not limit the present invention in any form. Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person familiar with the art, without departing from the scope of the technical solution of the present invention, can use the technical content disclosed above to make many possible changes and modifications to the technical solution of the present invention, or modify it into equivalent equivalent embodiments . Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims (10)

1. A molded case circuit breaker with residual current protection, comprising a base, a handle, a drawbar and a leakage release; the handle and the drawbar are respectively installed on the base; it is characterized in that: the leakage release The magnetic flux converter is used as the driving element for tripping, and the leakage release and the handle are installed side by side on the same side of the base relative to the draw bar. The direction of movement is opposite to that of the buckle of the circuit breaker. 2. The molded case circuit breaker with residual current protection according to claim 1, characterized in that: a rotary push rod linked with the handle is installed between the handle and the leakage release, and the rotary push rod is also connected with the The push rod of the magnetic flux converter cooperates, and when the handle is pulled toward the buckle direction, the handle drives the push rod of the magnetic flux converter to move toward the extending direction by rotating the push rod. 3. The molded case circuit breaker with residual current protection according to claim 2, characterized in that: the rotary push rod is provided with a notch formed by double convex parts; the push rod of the flux converter is provided with a second One convex part; when the handle is pulled towards the buckle direction, the convex part on the side of the notch of the rotating push rod cooperates with the first convex part of the pushing rod, and the rotating push rod drives the pushing rod of the magnetic flux converter to extend out direction. 4. The molded case circuit breaker with residual current protection according to claim 2 or 3, characterized in that: the leakage release also includes a release seat, a connecting rod, a jumper lock assembly, a release The device cover, reset button and return spring, the magnetic flux converter and the jumper lock assembly are respectively installed on the release seat, and the push rod of the magnetic flux converter is matched with the lock parts in the jumper lock assembly ; The connecting rod is fixed on the push rod of the magnetic flux converter; the tripper cover is fixed on the tripper seat; the reset button is installed on the tripper cover through a return spring and connected with the connecting rod Cooperate to achieve trip indication. 5 . The molded case circuit breaker with residual current protection according to claim 4 , characterized in that: the connecting rod and the push rod are integrated. 6. The molded case circuit breaker with residual current protection according to claim 4, characterized in that: the rotary push rod is installed at the position matched with the trip lock assembly of the leakage release, when the handle is loaded When pulling in the buckle direction, the handle touches the jumper part of the jumper lock assembly of the leakage release by rotating the protrusion on the other side of the notch of the push rod to realize the buckle loading. 7. The molded case circuit breaker with residual current protection according to claim 4, characterized in that: the connecting rod is provided with a through hole, and the through hole is provided with a high and low step surface, and the high step surface is at a position relative to the low step surface. In the extension direction of the push rod, there is a slope transition between the high step surface and the low step surface; the side of the reset button is provided with a second convex part extending into the through hole of the connecting rod. When in action, the second protrusion of the reset button cooperates with the high step surface of the through hole of the connecting rod. 8. The molded case circuit breaker with residual current protection according to claim 4, characterized in that: a first installation hole is provided on the side of the release base, and the rotary push rod is pivotally connected to the The side of the release seat is provided with a third convex part matched with the handle on the side of the rotary push rod, and the handle drives the rotary push rod to rotate through the third convex part. 9. The molded case circuit breaker with residual current protection according to claim 4, characterized in that: the leakage release also includes a circuit board and a fixing plate, and the circuit board and the fixing plate are respectively mounted on the tripping on the trip unit seat and under the trip unit cover. 10. The molded case circuit breaker with residual current protection according to claim 8, characterized in that: the side of the release base is further provided with a fourth protrusion facing the rotary push rod.