CN211350516U - Compact moulded case circuit breaker with thermomagnetic adjustable alarm non-tripping function - Google Patents

Abstract

The utility model relates to a take compact moulded case circuit breaker of adjustable warning of thermomagnetic not tripping function, including base, contact arc extinguishing module, well lid, operating device, upper cover, controller lid, the adjustable warning of overload does not trip current protection module and binding post subassembly, the adjustable warning of overload does not trip current protection module with the operating device matches the setting, when the electric current exceeds rated current by a certain multiple, the adjustable warning of overload does not trip current protection module and sends overload alarm signal; when the short-circuit current appears in the circuit, the overload adjustable alarm does not trip the current protection module to act directly, and the operating mechanism is pushed to trip the circuit breaker to break the circuit. Compared with the prior art, the circuit breaker has compact structure and can realize the functions of short-circuit protection, overload alarm and adjustability.

Description

Compact moulded case circuit breaker with thermomagnetic adjustable alarm non-tripping function

Technical Field

The utility model relates to a circuit breaker technical field, concretely relates to take adjustable warning of thermomagnetic not compact moulded case circuit breaker of function of not detaining.

Background

The requirements of people on the electricity safety are becoming stricter, and the plastic shell circuit breaker with the current protection action is widely applied due to compact structure, small volume and high cost performance. The release is an important mechanism in the circuit breaker, and the release is used for converting electric energy into mechanical action and separating the molded case circuit breaker when receiving a release signal. The traditional release is divided into an electronic release, a thermomagnetic release and the like, is generally installed in the circuit breaker, and is matched with a draw bar of the molded case circuit breaker to realize the releasing action.

The release of the current common small-current molded case circuit breaker mainly comprises a coil, an iron core, a spring, a pull rod and a bracket. When the coil passes through alternating current, a magnetic field is generated in the coil, the iron core overcomes the spring force to pull the pull rod, and the pull rod pulls a pull rod of an operating mechanism of the circuit breaker to enable the circuit breaker to be opened.

Patent CN 101685728B discloses a thermomagnetic release applied to a small-sized low-voltage circuit breaker, which comprises a bracket, a short-circuit release system and an overload release system, wherein the short-circuit release system and the overload release system are respectively arranged on two sides of a bracket plate; and during short circuit, the movable armature iron overcomes the action of the counter-force spring under the action of magnetic field force. Overload tripping system includes thermal element, bimetallic strip, and the two is folded on the boss of support bottom, and soft coupling is established ties thermal element and/or bimetallic strip to the circuit in order to respond to overload signal, and the resistance card is connected to with the series connection mode increase calorific capacity on thermal element and/or the bimetallic strip, this utility model improves job stabilization nature, guarantees that the circuit breaker can reliably and stably cut off fault current.

At present, for the molded case circuit breaker with the 63A cradle, because the molded case circuit breaker with the 63A cradle has a small volume, the thermomagnetic molded case circuit breaker with the 63A cradle does not have an overload adjustable function, or the whole volume of the circuit breaker with the overload adjustable function is large, and the existing release module is difficult to meet the requirements, or to realize functions of short-circuit protection, overload alarm, adjustment and the like at the same time.

In addition, in the structure of the existing circuit breaker, an insert or a nut is usually placed in the center of an arc extinguishing module, a mounting hole is formed in the bottom of a base, the module is fixed on the base through a screw when the module is fixed, and the screw and the nut occupy partial space of the module or the base in the module fixing mode, so that the overall height of the circuit breaker is increased to a certain extent.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a take the adjustable warning of thermomagnetic not to detain the compact moulded case circuit breaker of function in order to solve above-mentioned problem.

The purpose of the utility model is realized through the following technical scheme:

a compact plastic case circuit breaker with thermomagnetic adjustable alarm non-tripping function comprises a base, a contact arc extinguishing module, a middle cover, an operating mechanism, an upper cover, a controller cover, an overload adjustable alarm non-tripping current protection module and a wiring terminal assembly, the operating mechanism is arranged on one phase of the contact arc extinguishing module, a plurality of contact arc extinguishing modules are fixed together by a long shaft and are arranged in the base together, and forms interlocking with the wiring terminal assembly, the overload adjustable alarm non-tripping current protection module is arranged in the base, the middle cover is arranged on the base, the upper cover and the controller cover are arranged on the uppermost part to form a closed circuit breaker assembly, the overload adjustable alarm non-tripping current protection module is matched with the operating mechanism, when the current exceeds the rated current by a certain multiple, the overload adjustable alarm non-tripping current protection module sends an overload alarm signal; when the short-circuit current appears in the circuit, the overload adjustable alarm does not trip the current protection module to act directly, and the operating mechanism is pushed to trip the circuit breaker to break the circuit.

Further, the overload adjustable alarm non-tripping current protection module comprises:

a module base;

one or more electromagnetic assemblies mounted within the module base, comprising:

the magnetic yoke is internally provided with an electromagnetic coil unit;

the pull rod is rotatably arranged on the upper part of the magnetic yoke and is fixedly connected with an armature, the armature is positioned on the upper part of the electromagnetic coil unit, and a first elastic reset piece is further arranged at the bottom of the pull rod; and

the bimetallic strip and the thermal element are fixedly connected to the magnet yoke together, and the upper end of the bimetallic strip is provided with a stop block;

a lock catch lever mechanism which is arranged on the upper part of the module base, is matched with the electromagnetic assembly and comprises a lock catch lever and an alarm semi-axis nested with the lock catch lever, the alarm semi-axis can rotate relative to the lock catch lever, two ends of the lock catch lever are provided with an axis A, the axis A is provided with a second elastic reset piece, so that the lock catch lever and the alarm semi-axis have the tendency of rotating towards the direction of the bimetallic strip,

the lock catch rod is provided with a hook and one or more flanges matched with the pull rod;

one or more supporting parts matched with the abutting block are arranged on the alarm half shaft, and pressing sheets are arranged on the supporting parts and correspond to the micro switch of the alarm mechanism; and

the reset push rod is arranged on the module base and matched with the hook on the lock catch rod, and the bottom of the reset push rod is provided with a third elastic reset piece;

in a normal reset state, the hook is clamped on the reset push rod;

when the current is overloaded, the electromagnetic assembly acts on the alarm half shaft to enable the alarm half shaft to deflect, and a pressing sheet on the alarm half shaft is contacted with the microswitch to alarm;

when the current is short-circuited, the electromagnetic assembly acts on the lock catch rod to enable the hook to be tripped with the reset push rod, and after tripping is performed, the reset push rod pushes the tripping shaft of the circuit breaker mechanism to break a main circuit of the circuit breaker.

Furthermore, the upper part of the module base is also provided with a release face cover, and the electromagnetic assembly and the lock catch rod mechanism are covered by the release face cover.

Furthermore, the electromagnetic assemblies are provided with 3-5 groups, are arranged in the module base in rows, and are assembled with the limiting blocks to limit the initial position of the pull rod.

Further, the electromagnetic coil unit comprises a coil, an iron core and a coil framework, the coil framework is sleeved outside the iron core, the coil is sleeved outside the coil framework, the armature is coaxially arranged on the upper portion of the iron core at intervals, a guide plate is arranged outside the armature, when the armature is in a short circuit state, the current in the coil is increased, and the armature moves downwards to drive the pull rod to realize overturning.

Further, the pull rod is rotatably arranged on the magnetic yoke through a shaft B, the first elastic resetting piece comprises a shaft C arranged on the pull rod and a spring C sleeved on the shaft C, the shaft C is parallel to the shaft B, and the spring C has an acting force for enabling the pull rod to overturn.

Furthermore, the bimetallic strip abutting block is a wedge block, and the supporting part comprises an adjusting screw and a nut.

Furthermore, the alarm half shaft can move axially through the arranged knob, the lower end of the knob is inserted into the middle of the groove of the alarm half shaft, and the alarm half shaft is driven to slide when the knob is rotated to adjust the distance between the supporting part and the wedge block.

Furthermore, the second elastic reset piece comprises a spring C and a spring D, the module is also provided with a button for manually controlling the turning of the pull rod, and the button is provided with a spring B for resetting the button.

Furthermore, the lock catch rod comprises a middle cylindrical rod and flanges arranged at two ends of the cylindrical rod, the alarm half shaft is of a semi-cylindrical shell structure and is nested on the lock catch rod, and the alarm half shaft has certain rotation allowance around the cylindrical rod in the middle of the lock catch rod.

Further, bottom one end is equipped with the base flange in the base, the front end of contact arc extinguishing module is equipped with arc extinguishing module boss, contact arc extinguishing module installs in the base, after the installation targets in place, arc extinguishing module boss is located the upper portion of base flange, and the two looks parallel and level, the wiring terminal subassembly is equipped with the joint mouth, the wiring terminal subassembly level peg graft in on the base, after the installation targets in place, the joint mouth blocks arc extinguishing module boss and base flange simultaneously. The wiring terminal subassembly blocks arc extinguishing module boss and base flange simultaneously, makes both can't throw off in the direction of height, and wiring terminal subassembly, arc extinguishing module subassembly, base have formed the interlocking like this, can not loosen naturally and take off, and this kind of interlocking structural design avoids design nut mounted position or inserts in arc extinguishing module subassembly, has reduced the overall height of arc extinguishing module design, realizes miniaturized design.

The structure is beneficial to reducing the overall height of the molded case circuit breaker, and has positive significance for the design of the circuit breaker driven by a small case under the miniaturization trend of the molded case circuit breaker.

Furthermore, a connecting lug is arranged at the bottom of the base, a connecting part matched with the connecting lug is arranged at the bottom of the wiring terminal assembly, a connecting hole is formed in the connecting part, and the connecting hole is sleeved on the connecting lug to realize the fixed connection of the wiring terminal assembly and the base.

Further, the connecting lug is cylindrical, the connecting part is elastic and thin, and the connecting hole is a round hole matched with the cylindrical connecting hole. After the wiring terminal assembly is installed in place, the sheet at the bottom of the wiring terminal assembly is provided with the round hole to be sleeved on the cylindrical boss of the base by virtue of plastic elasticity, so that the sheet is limited in the horizontal direction and cannot be loosened along the base.

Furthermore, the clamping interface of the wiring terminal component is a C-shaped opening, and the arc extinguishing module boss and the base flange are clamped simultaneously, so that the arc extinguishing module boss and the base flange cannot be separated in the height direction.

Furthermore, the rear end of the contact arc extinguishing module is provided with a pressing plate, the pressing plate is fixed on the base through a connecting piece, and the pressing plate fixes the rear end of the contact arc extinguishing module on the base.

Furthermore, the length of the pressing plate is consistent with the total width of the contact arc extinguishing module, the pressing plate is a rectangular plate, and a plurality of partition plates are arranged at the lower part of the pressing plate, so that the contact arc extinguishing module can form an independent air outlet channel.

Compared with the prior art, the utility model discloses following beneficial effect has:

(1) the overload adjustable alarm non-tripping current protection module arranged on the circuit breaker realizes the functions of short circuit protection and overload alarm non-tripping simultaneously in a limited space range, an electromagnetic coil unit is arranged in a magnetic yoke in an electromagnetic assembly, a bimetallic strip and a thermal element are arranged outside the magnetic yoke, the short circuit or overload process is responded respectively, and the overload adjustable alarm non-tripping current protection module is matched with a lock catch rod mechanism to realize the disconnection protection or alarm of the circuit breaker.

(2) The abutting block of the bimetallic strip is a wedge block, has a certain gradient, the position of the lock catch rod can be axially adjusted by setting the knob, the distance between the supporting part and the wedge block is adjusted, and the relative distance determines the overload current to realize module alarming, so that the overload adjustable function is realized.

(3) The utility model discloses a part interlocking design need not design nut mounted position or inserts in arc extinguishing module subassembly, has reduced the whole height of arc extinguishing module design, realizes miniaturized design.

(4) Arc extinguishing module subassembly generally comprises thermosetting material, the utility model discloses not in the fastening of module interior design screw nut, can avoid the module to install and cause local material fracture when screwing up on the base.

(5) The utility model discloses at the anterior and rear portion of arc extinguishing module assembly with module fixed baseplate on, and not at arc extinguishing module assembly and base, the hole of corresponding position design fastening connection helps increasing the physical strength at arc extinguishing module middle part core position, reduces the breaker and receives high strength atmospheric pressure impact and cause the probability of module damage and base fracture at the disconnected in-process of heavy current short circuit breaking.

(6) The utility model discloses the clamp plate has both played the effect of fixed arc extinguishing module subassembly and has played phase-to-phase insulating's effect, has effectively realized providing the effect of air outlet channel for the arc extinguishing module simultaneously.

Drawings

Fig. 1 and 2 are schematic diagrams of the overall explosion structure of the embodiment of the invention;

fig. 3 is a schematic diagram of the overall structure of an overload adjustable alarm non-tripping current protection module;

FIG. 4 is an exploded view of FIG. 3;

FIG. 5 is a cross-sectional view of an overload adjustable alarm no-trip current protection module;

FIG. 6 is a schematic diagram of a solenoid assembly;

FIG. 7 is an exploded view of FIG. 6;

FIG. 8 is a cross-sectional view of FIG. 6;

fig. 9 is a schematic structural view of the latch lever mechanism;

fig. 10 is a schematic diagram of a normal reset state of an overload adjustable alarm non-tripping current protection module;

fig. 11 is a schematic view of an overload alarm state of an overload adjustable alarm non-tripping current protection module;

fig. 12 is a schematic cross-sectional view of an embodiment of the present invention;

fig. 13 is a partial schematic view of a terminal assembly, an arc extinguishing module and a base according to an embodiment of the present invention;

fig. 14 is a schematic view of a terminal assembly according to an embodiment of the present invention after installation;

fig. 15 is a schematic view of the installation of the pressing plate according to the embodiment of the present invention.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

Examples

Referring to fig. 1 and 2, a compact molded case circuit breaker with thermo-magnetic adjustable alarm tripping-free function comprises a base 1, a contact arc extinguishing module 2, a middle cover 3, an operating mechanism 4, an upper cover 5, a controller cover 6, an overload adjustable alarm tripping-free current protection module 7 and a wiring terminal assembly 8, wherein the operating mechanism 4 is mounted on the contact arc extinguishing module 2, a plurality of contact arc extinguishing modules 2 are fixed together by a long shaft and are installed in the base 1 together and interlocked with the wiring terminal assembly 8, the overload adjustable alarm tripping-free current protection module 7 is installed in the base 1, the middle cover 3 is covered on the base 1, the upper cover 5 and the controller cover 6 are covered on the uppermost part to form a closed circuit breaker assembly, and the overload adjustable alarm tripping-free current protection module 7 is matched with the operating mechanism 4, when the current exceeds the rated current by a certain multiple, the overload adjustable alarm non-tripping current protection module 7 sends an overload alarm signal; when the short-circuit current occurs in the circuit, the overload adjustable alarm tripping-free current protection module 7 directly acts to push the operating mechanism 4 to trip the circuit breaker to break the circuit.

Specifically, as shown in fig. 3, 4 and 5, the overload adjustable alarm tripping-free current protection module 7 includes: a module base 300 for mounting components; four electromagnetic assembly 100, install in module base 300 in a row, the initial position is injectd to stopper 301 of reloading, a latch lever mechanism 200, install in the upper portion of module base 300, cooperate with electromagnetic assembly 100, a push rod 600 resets, locate on module base 300, the push rod 600 bottom that resets is equipped with third elasticity and resets 601, the push rod 600 that resets 800 phase-matches with circuit breaker mechanism trip shaft, third elasticity resets 601 and is spring A, spring A makes the trend that the push rod that resets toward circuit breaker mechanism trip shaft 800 upset. In the short circuit state, the reset push rod 600 pushes against the trip shaft 800 of the circuit breaker mechanism, and the main circuit of the circuit breaker is disconnected. The upper portion of the module base 300 is further provided with a release cover 400, and the electromagnetic assembly 100 and the latch bar mechanism 200 are covered by the release cover 400.

As shown in fig. 6, 7 and 8, the electromagnetic assembly 100 includes a yoke 108, and an electromagnetic coil unit is disposed in the yoke 108; the pull rod 102 is rotatably arranged at the upper part of the magnet yoke 108, the pull rod 102 is fixedly connected with an armature 114, the armature 114 is positioned at the upper part of the electromagnetic coil unit, the bottom of the pull rod 102 is also provided with a first elastic reset piece, the first elastic reset piece comprises a shaft C116 arranged on the pull rod 102 and a spring E115 sleeved on the shaft C116, the shaft C116 is parallel to the shaft B103, and the spring E115 has an acting force for overturning the pull rod 102; and a bimetal 104 and a thermal element 105, the bimetal 104 and the thermal element 105 are fixedly connected to the yoke 108, and the upper end of the bimetal 104 is provided with a stop.

The electromagnetic coil unit comprises a coil 107, an iron core 110 and a coil 107 framework, wherein the coil 107 framework is sleeved outside the iron core 110, the coil 107 is sleeved outside the coil 107 framework, an armature 114 is coaxially arranged at the upper part of the iron core 110 at intervals, a guide plate 113 is arranged outside the armature 114, a connecting plate 112 is further arranged outside the magnet yoke 108, when the electromagnetic coil unit is in a short circuit state, the current in the coil 107 is increased, and the armature 114 moves downwards to drive the pull rod 102 to turn over. The pull rod 102 is rotatably provided on the yoke 108 via a shaft B103. The bimetal 104 is stopped as a wedge 101.

Referring to fig. 9, the lock lever mechanism 200 includes a lock lever 201 and an alarm half-shaft 202 nested with the lock lever 201, the lock lever includes a middle cylindrical rod and flanges disposed at two ends of the cylindrical rod, the alarm half-shaft 202 is a semi-cylindrical shell structure, the alarm half-shaft 202 is nested on the lock lever, the alarm half-shaft 202 is rotatable relative to the lock lever 201, and the alarm half-shaft 202 has a certain rotation margin around the middle cylindrical rod of the lock lever. Two ends of the lock catch rod 201 are provided with a shaft A2011, the shaft A2011 is provided with a second elastic reset piece which comprises a spring C203 and a spring D204, so that the lock catch rod and the alarm half shaft 202 have the tendency of rotating towards the direction of the bimetallic strip 104, and the lock catch rod 201 is provided with a hook 2012 and a plurality of flanges 2013 matched with the pull rod 102; the alarm half shaft 202 is provided with a plurality of supporting parts 2021 matched with the resisting blocks, the supporting parts 2021 comprise adjusting screws and nuts, the supporting parts 2021 are provided with pressing sheets 2022, the pressing sheets 2022 correspond to the microswitch 900 of the alarm mechanism, and the microswitch 900 is installed on the module base 300 through the supporting part 901.

Referring to fig. 4, the alarm half shaft 202 can move axially through the knob 500, the lower end of the knob 500 is inserted into the middle of the groove of the alarm half shaft 202, when the knob 500 is rotated, the alarm half shaft is driven to slide, the distance between the supporting portion 2021 and the wedge 101 is adjusted, and the relative distance determines how much current is overloaded to realize module tripping, so that the overload adjustable function is realized.

As shown in fig. 5, the module is further provided with a button 700 for manually controlling the turning of the pull rod 102, and a spring B701 for resetting the button 700 is mounted on the button 700, so that a manual tripping function can be realized.

The specific installation process of the module is as follows: the coil bobbin 111 is sleeved outside the iron core 110, and then sleeved with the coil assembly and mounted in the magnetic yoke 108. The thermal element 105, the connecting plate 112, the bimetal 104, and the wedge 101 are welded to each other integrally. After the coil assembly is fitted into the yoke 108, the guide plate 113 is riveted to the yoke 108. The spring E115 is then mounted in a hole in the lower face of the yoke 108 via the axis C116 and the pull rod 102 is mounted in a hole in the upper face of the yoke 108 via the axis B103. The entire electromagnetic assembly is fastened at the sides to the module base by means of fixing screws 106 and at the lower part to the module base by means of screws 109.

When the main circuit of the circuit breaker is energized, the bimetal 104 welded on the thermal element 105 is bent, and the bending degree is in proportion to the magnitude of the overload current. The whole electromagnetic assembly has the function of an electromagnet, when a main loop passes through current, a coil can generate electromagnetic force to attract the iron core 114, the armature 114 is clamped in a clamping groove of the pull rod 102, and when the electromagnetic force is large enough, the pull rod 102 can be pulled to rotate around the shaft B103 by overcoming the counterforce of the spring E115 until the armature 114 and the iron core 110 are attracted.

After the four electromagnetic assemblies are installed on the module base 100, the lock catch rod 201 and the alarm half shaft 202 are nested with each other, and then the lock catch rod, the spring C203 and the spring D204 are installed on the module base 100 through a shaft A2011, the spring D204 plays a role in resetting the lock catch rod 201, and the spring C203 plays a role in resetting the alarm half shaft 202. The latching lever 201 and the upper portion of the alarm half shaft 202 tend to rotate toward the bimetal 104. An adjusting screw and a nut are arranged on the alarm half shaft 202, a pressing sheet 2022 is arranged on one phase of the alarm half shaft, when the current of the main circuit of the circuit breaker is overloaded, the bimetallic strip 104 can be heated and bent, and when the bimetallic strip reaches a certain bending degree, the wedge block 101 on the upper part of the bimetallic strip can be pushed against the adjusting screw, so that the alarm half shaft 202 rotates by overcoming the acting force of the spring C203.

Fig. 10 is a schematic diagram of the latch lever mechanism in a normal reset state, when the current in the main circuit of the circuit breaker is overloaded to a certain extent, as shown in fig. 11, the bimetal 104 is heated and bent to make the wedge 101 press against the adjusting screw, so that the alarm half shaft 202 rotates against the force of the spring C203. The support 901 and the microswitch 900 are mounted on the trip body cover 400. When the alarm half-shaft 202 rotates to a certain angle, the pressing piece 2022 installed at one end of the alarm half-shaft 202 presses the action button of the micro switch 900, so that the micro switch outputs an alarm signal. On the contrary, when the current is reduced to return to the normal level, the heating of the thermal element 105 is reduced, the bimetallic strip 104 is gradually reset, the alarm half shaft 202 is reset under the action of the spring C203, and finally the pressing sheet 2022 releases the action button of the microswitch 900, so that the alarm signal is released.

On the other hand, when the main circuit passes through the short-circuit current, the electromagnetic force generated by the coil overcomes the counterforce of the spring E115, attracts the armature 114, drives the pull rod 102 to turn over, makes the upper part of the pull rod touch and drive the flange 2013 at the lower part of the lock rod, and turns over the lock rod, so that the module is tripped, and the reset push rod 600 pushes against the trip shaft 800 of the circuit breaker mechanism, so that the mechanism is disassembled to break the main circuit of the circuit breaker, and the function of short-circuit protection is realized.

After the whole thermomagnetic overload adjustable current protection module is installed in a molded case circuit breaker body, the button 700 and the spring B701 are installed in a middle cover of the circuit breaker, so that a user can press the button 700 from the outside to push the pull rod 102 to turn the button, the module is tripped, the manual module tripping action of the user is realized, and when other external modules are connected, the module has the function of module linkage if an electric leakage module is connected.

After the thermomagnetic overload adjustable current protection module is installed in a molded case circuit breaker body, the functions of short circuit protection, overload alarm non-tripping and adjustable, manual tripping and provision of an external linkage interface of the circuit breaker can be realized.

In order to reduce the overall height of arc extinguishing module design, realize miniaturized design, as fig. 12, bottom one end is equipped with base flange 1001 in base 1, the front end of contact arc extinguishing module 2 is equipped with arc extinguishing module boss 2001, contact arc extinguishing module 2 is installed in base 1, the back of targetting in place installs, arc extinguishing module boss 2001 is located the upper portion of base flange 1001, and the two is parallel and level mutually, binding post subassembly 8 is equipped with joint mouth 8001, binding post subassembly 8 level peg graft in on the base 1, after installing targetting in place, joint mouth 8001 blocks simultaneously arc extinguishing module boss 2001 and base flange 1001.

As shown in fig. 13 and 14, a connecting bump is arranged at the bottom of the base 1, a connecting portion 8002 matched with the connecting bump is arranged at the bottom of the terminal block assembly 8, the connecting portion 8002 is provided with a connecting hole, and the connecting hole is sleeved on the connecting bump to realize the fixed connection between the terminal block assembly 8 and the base 1; the clip port 8001 of the terminal assembly 8 is a C-shaped port, and simultaneously locks the arc extinguishing module boss 2001 and the base flange 1001, so that the two cannot be separated in the height direction.

As shown in fig. 15, a pressing plate 1000 is disposed at the rear end of the contact arc extinguishing module 2, the pressing plate 1000 is fixed on the base 1 through a connecting piece, and the pressing plate 1000 fixes the rear end of the contact arc extinguishing module 2 on the base; the length of the pressing plate 1000 is the same as the total width of the contact arc extinguishing module 2, the pressing plate 1000 is a rectangular plate, and the lower portion of the pressing plate 1000 is provided with a plurality of partition plates 10001, so that each phase of the contact arc extinguishing module 2 can form an independent air outlet channel 2002.

The embodiments described above are intended to facilitate the understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention according to the disclosure of the present invention.

Claims (10)

1. A compact molded case circuit breaker with thermomagnetic adjustable alarm non-tripping function is characterized by comprising a base (1), a contact arc extinguishing module (2), a middle cover (3), an operating mechanism (4), an upper cover (5), a controller cover (6), an overload adjustable alarm non-tripping current protection module (7) and a wiring terminal assembly (8),

the operating mechanism (4) is arranged on the contact arc extinguishing module (2) of one phase, a plurality of contact arc extinguishing modules (2) are fixed together by a long shaft and are arranged in the base (1) together and form interlocking with the wiring terminal assembly (8), the overload adjustable alarm non-tripping current protection module (7) is arranged in the base (1), the middle cover (3) is arranged on the base (1) in a covering mode, the upper cover (5) and the controller cover (6) are arranged on the uppermost portion in a covering mode to form a closed circuit breaker assembly,

the overload adjustable alarm non-tripping current protection module (7) is matched with the operating mechanism (4),

when the current exceeds the rated current by a certain multiple, the overload adjustable alarm non-tripping current protection module (7) sends an overload alarm signal;

when the short-circuit current appears in the circuit, the overload adjustable alarm non-tripping current protection module (7) directly acts to push the operating mechanism (4) to trip the circuit breaker to break the circuit.

2. The compact molded case circuit breaker with thermo-magnetic adjustable alarm non-tripping function according to claim 1, characterized in that the overload adjustable alarm non-tripping current protection module (7) comprises:

a module base (300);

one or more electromagnetic assemblies (100) mounted within the module base (300), comprising:

a magnetic yoke (108), wherein an electromagnetic coil unit is arranged in the magnetic yoke (108);

the pull rod (102) is rotatably arranged at the upper part of the magnetic yoke (108), the pull rod (102) is fixedly connected with an armature (114), the armature (114) is positioned at the upper part of the electromagnetic coil unit, and a first elastic reset piece is further arranged at the bottom of the pull rod (102); and

the magnetic yoke is characterized by comprising a bimetallic strip (104) and a thermal element (105), wherein the bimetallic strip (104) and the thermal element (105) are fixedly connected to the magnetic yoke (108), and the upper end of the bimetallic strip (104) is provided with a resisting block;

a lock catch lever mechanism (200) installed on the upper portion of the module base (300) and matched with the electromagnetic assembly (100), and comprising a lock catch lever (201) and an alarm half shaft (202) embedded with the lock catch lever (201), wherein the alarm half shaft (202) is rotatable relative to the lock catch lever (201), two ends of the lock catch lever (201) are provided with a shaft A (2011), a second elastic reset piece is arranged on the shaft A (2011), so that the lock catch lever and the alarm half shaft (202) have the tendency of rotating towards the direction of the bimetallic strip (104),

the lock catch rod (201) is provided with a hook (2012) and one or more flanges (2013) matched with the pull rod (102);

one or more supporting parts (2021) matched with the abutting block are arranged on the alarm half shaft (202), a pressing sheet (2022) is arranged on the supporting part (2021), and the pressing sheet (2022) corresponds to a microswitch (900) of the alarm mechanism; and

the reset push rod (600) is arranged on the module base (300) and matched with the hook (2012) on the lock catch rod (201), and the bottom of the reset push rod (600) is provided with a third elastic reset piece (601);

and in a normal reset state, the hook (2012) is clamped on the reset push rod (600).

3. The compact molded case circuit breaker with the thermo-magnetic adjustable alarm non-tripping function according to claim 2, wherein a trip unit cover (400) is further disposed on the upper portion of the module base (300), and the trip unit cover (400) covers the electromagnetic assembly (100) and the latch lever mechanism (200);

the electromagnetic assemblies (100) are provided with 3-5 groups, are arranged in the module base (300) in rows, and are provided with the limit blocks (301) to limit the initial positions of the pull rods (102).

4. The compact molded case circuit breaker with the thermo-magnetic adjustable alarm non-tripping function according to claim 2, wherein the electromagnetic coil unit comprises a coil (107), an iron core (110) and a coil (107) framework, the coil (107) framework is sleeved outside the iron core (110), the coil (107) is sleeved outside the coil (107) framework, the armature (114) is coaxially arranged at the upper part of the iron core (110) at intervals, a guide plate (113) is arranged outside the armature (114), when the circuit breaker is in a short circuit state, the current in the coil (107) is increased, and the armature (114) moves downwards to drive the pull rod (102) to turn over.

5. The compact molded case circuit breaker with the thermo-magnetic adjustable alarm non-tripping function according to claim 4, wherein the pull rod (102) is rotatably disposed on the yoke (108) through a shaft B (103), the first elastic reset member comprises a shaft C (116) disposed on the pull rod (102) and a spring C (203) sleeved on the shaft C (116), the shaft C (116) is parallel to the shaft B (103), and the spring C (203) has an acting force for overturning the pull rod (102); the abutting block of the bimetallic strip (104) is a wedge block (101), and the supporting part (2021) comprises an adjusting screw (2032) and a nut (2031).

6. The compact molded case circuit breaker with the thermomagnetic adjustable alarm non-tripping function according to claim 5, characterized in that the alarm half-shaft (202) can be moved axially by a knob (500), the lower end of the knob (500) is inserted into the middle of the groove of the alarm half-shaft (202), and when the knob (500) is rotated, the alarm half-shaft is driven to slide, and the distance between the support portion (2021) and the wedge block (101) is adjusted.

7. The compact molded case circuit breaker with thermo-magnetic adjustable alarm non-tripping function according to claim 2, characterized in that the second elastic reset member comprises a spring C (203) and a spring D (204), the module is further provided with a button (700) for manually controlling the turning of the pull rod (102), and the button (700) is provided with a spring B (701) for resetting the button;

the lock catch rod comprises a middle cylindrical rod and flanges arranged at two ends of the cylindrical rod, the alarm half shaft (202) is of a semi-cylindrical shell structure, the alarm half shaft (202) is nested on the lock catch rod, and the alarm half shaft (202) has certain rotation allowance around the cylindrical rod in the middle of the lock catch rod.

8. The compact molded case circuit breaker with the thermomagnetic adjustable alarm non-tripping function according to claim 1, wherein a base flange (1001) is arranged at one end of the bottom in the base (1), an arc extinguishing module boss (2001) is arranged at the front end of the contact arc extinguishing module (2), the contact arc extinguishing module (2) is installed in the base (1), after the arc extinguishing module boss (2001) is arranged on the upper portion of the base flange (1001) and is flush with the base flange, the wiring terminal assembly (8) is provided with a clamping interface (8001), the wiring terminal assembly (8) is horizontally inserted into the base (1), and after the wiring terminal assembly (8001) is installed in place, the arc extinguishing module boss (2001) and the base flange (1001) are clamped at the same time.

9. The compact molded case circuit breaker with the thermo-magnetic adjustable alarm non-tripping function according to claim 8, wherein a connecting bump is arranged at the bottom of the base (1), a connecting part (8002) matched with the connecting bump is arranged at the bottom of the terminal assembly (8), the connecting part (8002) is provided with a connecting hole, and the connecting hole is sleeved on the connecting bump to realize the fixed connection of the terminal assembly (8) and the base (1); the clamping interface (8001) of the wiring terminal assembly (8) is in a C-shaped opening, and the arc extinguishing module boss (2001) and the base flange (1001) are clamped at the same time, so that the wiring terminal assembly and the base flange cannot be separated in the height direction.

10. The compact molded case circuit breaker with the thermomagnetic adjustable alarm non-tripping function according to claim 1, wherein a pressing plate (1000) is arranged at the rear end of the contact arc extinguishing module (2), the pressing plate (1000) is fixed on the base (1) through a connecting piece, and the pressing plate (1000) fixes the rear end of the contact arc extinguishing module (2) on the base; the length of the pressing plate (1000) is consistent with the total width of the contact arc extinguishing module (2), the pressing plate (1000) is a rectangular plate, and a plurality of partition plates (10001) are arranged at the lower part of the pressing plate (1000), so that the contact arc extinguishing module (2) can form an independent air outlet channel (2002) in each phase.

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