CN112885660B

CN112885660B - Thermomagnetic overload alarm adjustable non-tripping current protection module and circuit breaker

Info

Publication number: CN112885660B
Application number: CN201911199302.5A
Authority: CN
Inventors: 赵轶磊
Original assignee: Shanghai Renmin Electrical Apparatus Works Co Ltd
Current assignee: Shanghai Renmin Electrical Apparatus Works Co Ltd
Priority date: 2019-11-29
Filing date: 2019-11-29
Publication date: 2024-09-13
Anticipated expiration: 2039-11-29
Also published as: CN112885660A

Abstract

The invention relates to a thermomagnetic overload alarm adjustable non-tripping current protection module and a circuit breaker, comprising a module base, an electromagnetic component, a latch lever mechanism and a reset push rod, wherein the electromagnetic component comprises a magnetic yoke, a pull rod, a bimetallic strip and a thermal element; when the current is overloaded, the electromagnetic assembly acts on the alarm half shaft to deflect the alarm half shaft, and a pressing sheet on the alarm half shaft is contacted with the micro switch to alarm; when the current is short-circuited, the electromagnetic component acts on the locking rod to enable the hook to trip with the reset push rod, and after the hook trips, the reset push rod is propped against the tripping shaft of the circuit breaker mechanism to disconnect the circuit breaker main loop. Compared with the prior art, the protection module has compact integral structure, and can realize the functions of short-circuit protection, overload alarm and adjustability after being installed in a molded case circuit breaker body.

Description

Thermomagnetic overload alarm adjustable non-tripping current protection module and circuit breaker

Technical Field

The invention belongs to the technical field of circuit breakers, and particularly relates to a thermomagnetic overload alarm adjustable non-tripping current protection module and a circuit breaker.

Background

The requirements of people on electricity safety are becoming strict, and the plastic-case circuit breaker with the electricity protection action is widely applied due to the compact structure, small volume and high cost performance. The release is an important mechanism in the circuit breaker, and the release has the function of converting electric energy into mechanical action and enabling the molded case circuit breaker to be opened when a release signal is received. The traditional tripping device is divided into an electronic tripping device, a thermomagnetic tripping device and the like, is generally installed in a circuit breaker, and is matched with a traction rod of a molded case circuit breaker to realize tripping action.

The trip 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 inside the coil, the iron core overcomes the spring force to pull the pull rod, and the pull rod pulls the pull rod of the operating mechanism of the circuit breaker, so that the circuit breaker is opened.

Patent CN 101685728B discloses a thermomagnetic release applied to a small-sized low-voltage circuit breaker, which consists of a bracket, a short-circuit release system and an overload release system which are separated at two sides of the bracket plate, wherein an electromagnetic coil of the short-circuit release system is wound on a columnar static iron core, and short-circuit current flows through the electromagnetic coil and generates a magnetic field together with the static iron core; and the movable armature overcomes the action of the counter-force spring under the action of magnetic field force during short circuit. The overload tripping system comprises a thermal element and a bimetallic strip, wherein the thermal element and the bimetallic strip are overlapped on a boss at the bottom of the bracket, the thermal element and/or the bimetallic strip is connected in series in a circuit by soft connection to induce an overload signal, and a resistance strip is connected to the thermal element and/or the bimetallic strip in series to increase heating value.

At present, as the molded case circuit breaker with the 63A shell frame has smaller volume, the thermomagnetic molded case circuit breaker with the 63A shell frame often has no overload adjustable function or has larger whole volume, and the existing release module is difficult to meet the requirement or realize the functions of short-circuit protection, overload alarm, adjustability and the like.

Disclosure of Invention

The invention aims to solve the problems and provide the thermomagnetic overload alarm adjustable non-tripping current protection module and the circuit breaker, wherein the protection module has a compact integral structure, and can realize the functions of short-circuit protection, overload alarm and adjustability after being arranged in a molded case circuit breaker body.

The aim of the invention is achieved by the following technical scheme:

A thermo-magnetic overload alarm adjustable non-trip current protection module, comprising:

A module base;

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

A magnetic yoke, in which an electromagnetic coil unit is arranged;

the pull rod is rotationally arranged at the upper part of the magnetic yoke and is fixedly connected with an armature, the armature 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; and

The bimetallic strip and the thermal element are fixedly connected to the magnetic yoke together, and a stop block is arranged at the upper end of the bimetallic strip;

A locking rod mechanism which is arranged at the upper part of the module base and matched with the electromagnetic assembly, and comprises a locking rod and an alarm half shaft nested with the locking rod, wherein the alarm half shaft can rotate relative to the locking rod, two ends of the locking rod are provided with a shaft A, a second elastic reset piece is arranged on the shaft A, so that the locking rod and the alarm half shaft have a tendency of rotating towards the direction of the bimetallic strip,

The locking rod is provided with a hook and one or more flanges matched with the pull rod;

The alarm half shaft is provided with one or more supporting parts matched with the resisting blocks, the supporting parts are provided with pressing sheets, and the pressing sheets correspond to the micro-switches 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 a third elastic reset piece is arranged at the bottom of the reset push rod;

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 deflect the alarm half shaft, and a pressing sheet on the alarm half shaft is contacted with the micro switch to alarm;

When the current is short-circuited, the electromagnetic assembly acts on the locking rod to enable the hook to be tripped with the reset push rod, and after the tripping, the reset push rod is propped against the tripping shaft of the circuit breaker mechanism to disconnect the main circuit of the circuit breaker.

Further, a release surface cover is further arranged on the upper portion of the module base, and covers the electromagnetic assembly and the locking rod mechanism.

Further, the electromagnetic assembly is provided with 3-5 groups, is arranged in a module base in rows, and is filled with 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 framework is sleeved outside the coil framework, the armatures are coaxially arranged on the upper portion of the iron core at intervals, a guide plate is arranged outside the armatures, when in a short circuit state, current in the coil is increased, and the armatures move downwards to drive the pull rod to overturn.

Further, the pull rod is rotatably arranged on the magnetic yoke through a shaft B, the first elastic reset 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 acting force for overturning the pull rod.

Further, the bimetal block is a wedge block, and the supporting part comprises an adjusting screw and a nut.

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

Further, the second elastic restoring member includes two springs, including a spring C and a spring D.

Further, the module is also provided with a button for manually controlling the overturning of the pull rod, and a spring B for resetting the button is arranged on the button.

Further, 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, the alarm half shaft is nested on the lock catch rod, and the alarm half shaft has a certain rotation allowance around the cylindrical rod in the middle of the lock catch rod.

Compared with the prior art, the invention has the following beneficial effects:

1. Through the structural arrangement of the module, short-circuit protection and overload alarm are realized 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, respond to a short-circuit or overload process respectively and are matched with a locking rod mechanism, so that the disconnection protection or alarm of a circuit breaker is realized, and the protection module can be arranged in a molded case circuit breaker of a 63A shell frame and has reliable action, compact structure and small volume.

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

3. The module is also provided with a button for manually controlling the pull rod to turn over, so that the manual tripping function can be realized.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the module of the present invention;

FIG. 2 is an exploded view of FIG. 1;

FIG. 3 is a cross-sectional view of a module of the present invention;

FIG. 4 is a schematic structural view of an electromagnetic assembly according to the present invention;

FIG. 5 is an exploded view of FIG. 4;

FIG. 6 is a cross-sectional view of FIG. 4;

FIG. 7 is a schematic view of a latch lever mechanism according to the present invention;

FIG. 8 is a schematic view of a latch lever according to the present invention;

FIG. 9 is a schematic diagram of the structure of the warning half shaft of the present invention;

FIG. 10 is a schematic diagram of a normal reset state of the module of the present invention;

FIG. 11 is a schematic view of a latch lever mechanism in a normal reset state of the module of the present invention;

FIG. 12 is a schematic diagram of an overload alarm condition for a module of the present invention;

FIG. 13 is a schematic view of a module overload alert condition latch lever mechanism of the present invention;

fig. 14 is a schematic view showing a structure in which the module of the present invention is mounted to a circuit breaker;

In the figure:

100 electromagnetic assembly: 101 wedge block, 102 pull rod, 103 shaft B, 104 bimetallic strip, 105 thermal element, 106 screw, 107 coil, 108 magnetic yoke, 109 fixing screw, 110 iron core, 111 coil frame, 112 connecting plate, 113 guide plate, 114 armature, 115 spring E, 116 shaft C;

200 lock catch rod mechanism: 201 a locking rod, 2011 an axle A, 2012 a hook and 2013 a flange; 202 alarm half shaft, 2021 supporting part, 2022 pressing sheet, 203 spring C, 204 spring D

300 Module base, 301 stopper;

400 tripper face cover;

a 500 knob; 501 grooves;

600 reset push rod, 601 third elastic reset piece;

700 button, 701 spring B;

A trip shaft of the 800 mechanism;

900 micro-switches, support 901.

Detailed Description

The invention will now be described in detail with reference to the drawings and specific examples.

As shown in fig. 1,2 and 3, a thermo-magnetic overload alarm adjustable non-tripping current protection module, taking a four-pole circuit breaker as an example, comprises:

A module base 300 for mounting the components; the four electromagnetic assemblies 100 are installed in a row in the module base 300, the limiting block 301 is installed in the module base 300 to limit the initial position, the locking rod mechanism 200 is installed on the upper portion of the module base 300 and matched with the electromagnetic assemblies 100, the reset push rod 600 is arranged on the module base 300, a third elastic reset piece 601 is arranged at the bottom of the reset push rod 600 and matched with the tripping shaft 800 of the circuit breaker mechanism, the third elastic reset piece 601 is a spring A, and the spring A enables the reset push rod to turn over towards the tripping shaft 800 of the circuit breaker mechanism. In the short circuit state, the reset push rod 600 is pushed to the tripping shaft 800 of the circuit breaker mechanism to disconnect the main circuit of the circuit breaker. The upper part of the module base 300 is also provided with a release surface cover 400, and the release surface cover 400 covers the electromagnetic assembly 100 and the lock catch lever mechanism 200.

As shown in fig. 4, 5 and 6, the electromagnetic assembly 100 includes a yoke 108, and an electromagnetic coil unit is disposed in the yoke 108; the pull rod 102 is rotationally arranged on the upper part of the magnetic yoke 108, the pull rod 102 is fixedly connected with an armature 114, the armature 114 is arranged on 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 acting force for overturning the pull rod 102; and a bimetal 104 and a thermal element 105, wherein the bimetal 104 and the thermal element 105 are fixedly connected to the magnetic yoke 108, and a stop block is arranged at the upper end of the bimetal 104.

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 also arranged outside the magnetic yoke 108, and when 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 overturn. The pull rod 102 is rotatably provided to the yoke 108 via the shaft B103. The bimetal 104 is a wedge 101.

As shown in fig. 7, 8 and 9, the latch lever mechanism 200 includes a latch lever 201 and an alarm half shaft 202 nested with the latch lever 201, the latch lever includes a middle cylindrical rod and flanges disposed 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 latch lever, the alarm half shaft 202 is rotatable relative to the latch lever 201, and the alarm half shaft 202 has a certain rotation allowance around the middle cylindrical rod of the latch lever. The two ends of the lock catch rod 201 are provided with an axle A2011, the axle A2011 is provided with a second elastic resetting piece which comprises a spring C203 and a spring D204, so that the lock catch rod and the alarm half shaft 202 have a trend of rotating towards 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 micro-switches 900 of the alarm mechanism, and the micro-switches 900 are arranged on the module base 300 through supporting pieces 901.

The alarm half shaft 202 can axially move through the set 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 part 2021 and the wedge block (101) is adjusted, the relative distance determines how much current overload realizes module tripping, and therefore the overload adjustable function is realized.

The module is also provided with a button 700 for manually controlling the turnover of the pull rod 102, and a spring B701 for resetting the button 700 is arranged on the button 700, so that the manual tripping function can be realized.

The specific installation process of the module is as follows:

The coil former 111 is sleeved outside the iron core 110, and then the coil assembly is sleeved together in the magnetic yoke 108. The thermal element 105, the connection plate 112, the bimetal 104, and the wedge 101 are welded to each other as one body. After the coil assembly is fitted into the yoke 108, the guide plate 113 is riveted to the yoke 108. Spring E115 is then mounted in the hole below yoke 108 via axis C116 and pull rod 102 is mounted in the hole above yoke 108 via axis B103. The entire electromagnetic assembly is fastened on the side to the module base by means of fixing screws 106 and on the lower part by means of screws 109.

When the main circuit of the circuit breaker is energized, the bimetal 104 welded to the heating element 105 is bent, and the bending degree is proportional to the magnitude of the overload current. The whole electromagnetic assembly plays a role of an electromagnet, when the main loop passes through current, the coil generates electromagnetic force, the iron core 114 can be attracted, 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 is pulled to rotate around the shaft B103 against the reaction force of the spring E115 until the armature 114 is attracted with the iron core 110.

After all four electromagnetic assemblies are installed on the module base 100, after the locking rod 201 and the alarm half shaft 202 are mutually nested, the locking rod 201, the spring C203 and the spring D204 are installed on the module base 100 through the shaft A2011, the spring D204 plays a role in resetting the locking rod 201, and the spring C203 plays a role in resetting the alarm half shaft 202. The upper parts of the locking rod 201 and the alarm half shaft 202 have a tendency to rotate towards the bimetal 104. The alarm half shaft 202 is provided with an adjusting screw and a nut, one phase of the alarm half shaft 202 is provided with a pressing sheet 2022, when the current of the main circuit of the circuit breaker is overloaded, the bimetallic strip 104 is heated and bent, and when the current reaches a certain degree of bending, the wedge 101 at the upper part of the bimetallic strip is propped against the adjusting screw, so that the alarm half shaft 202 rotates against the acting force of the spring C203.

Fig. 10 and 11 are schematic diagrams of the latch lever mechanism in the normal reset state, and when the current overload of the main circuit of the circuit breaker reaches a certain level, as shown in fig. 12 and 13, the bimetal 104 is heated to bend so that the wedge 101 abuts against the adjusting screw, and the alarm half shaft 202 rotates against the acting force of the spring C203. The support 901 and the micro switch 900 are mounted on the trip unit 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 action button outputs an alarm signal. Conversely, when the current decreases to the normal level, the heat generated by the thermal element 105 decreases, the bimetal 104 gradually resets, the alarm half shaft 202 returns under the action of the spring C203, and finally the pressing piece 2022 releases the action button of the micro switch 900, and 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 reaction force of the spring E115, attracts the armature 114 and drives the pull rod 102 to turn over, so that the upper part of the armature touches and drives the flange 2013 at the lower part of the latch rod, and the latch rod turns over, thereby releasing the module, and the reset push rod 600 is propped against the trip shaft 800 of the circuit breaker mechanism, so that the mechanism is disassembled, thereby achieving the function of disconnecting the circuit breaker main circuit, and realizing the function of short-circuit protection.

After the whole thermomagnetic overload adjustable current protection module is installed in the molded case circuit breaker body, as shown in fig. 14, the button 700 and the spring B701 are installed in the middle cover of the circuit breaker, a user can press the button 700 from the outside so as to push the pull rod 102 to turn over, thereby achieving the function of tripping the module, realizing the function of manually tripping the module by the user, and playing the function of module linkage when other modules are externally connected, such as a leakage module.

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

The previous description of the embodiments is provided to facilitate a person of ordinary skill in the art in order to make and use the present invention. It will be apparent to those skilled in the art that various modifications can be readily made to these embodiments 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-described embodiments, and those skilled in the art, based on the present disclosure, should make improvements and modifications without departing from the scope of the present invention.

Claims

1. The utility model provides a thermomagnetic overload warning adjustable no-tripping current protection module which characterized in that includes:

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 rotationally 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

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 a blocking block is arranged at the upper end of the bimetallic strip (104);

The locking rod mechanism (200) is arranged at the upper part of the module base (300) and is matched with the electromagnetic assembly (100), the locking rod mechanism comprises a locking rod (201) and an alarm half shaft (202) nested with the locking rod (201), the alarm half shaft (202) is rotatable relative to the locking rod (201), two ends of the locking rod (201) are provided with shafts A (2011), the shafts A (2011) are provided with second elastic reset pieces, so that the locking rod and the alarm half shaft (202) have a tendency of rotating towards the direction of the bimetallic strip (104), and the locking rod (201) is provided with hooks (2012) and one or more flanges (2013) matched with the pull rod (102); one or more supporting parts (2021) matched with the resisting blocks are arranged on the alarming half shaft (202), a pressing sheet (2022) is arranged on the supporting part (2021), and the pressing sheet (2022) corresponds to a micro switch (900) of the alarming mechanism; and

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

A normal reset state, wherein the hook (2012) is clamped on the reset push rod (600);

When the current is overloaded, the electromagnetic assembly (100) acts on the alarm half shaft (202) to deflect the alarm half shaft (202), and a pressing sheet (2022) on the alarm half shaft (202) is in contact with the micro switch (900) to alarm;

When the current is short-circuited, the electromagnetic assembly (100) acts on the locking rod (201) to enable the hook (2012) to be tripped with the reset push rod (600), and after the tripping, the reset push rod (600) is propped against the tripping shaft (800) of the circuit breaker mechanism to disconnect the main circuit of the circuit breaker;

The upper part of the module base (300) is also provided with a release surface cover (400), and the release surface cover (400) covers the electromagnetic assembly (100) and the lock catch rod mechanism (200);

The electromagnetic assembly (100) is provided with 3-5 groups, is arranged in a row in the module base (300), and is filled with limiting blocks (301) to limit the initial position of the pull rod (102).

2. The thermomagnetic overload alarm adjustable non-tripping current protection module according to claim 1, 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), and when 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 overturn.

3. The adjustable non-tripping current protection module for the thermomagnetic overload alarm according to claim 2, wherein the pull rod (102) is rotatably arranged on the magnetic yoke (108) through an axis B (103), the first elastic reset piece comprises an axis C (116) arranged on the pull rod (102) and a spring E (115) sleeved on the axis C (116), the axis C (116) is parallel to the axis B (103), and the spring E (115) has a force for overturning the pull rod (102).

4. The adjustable non-tripping current protection module for the thermomagnetic overload alarm according to claim 1, wherein the abutment block of the bimetallic strip (104) is a wedge block (101), and the supporting portion (2021) comprises an adjusting screw (2032) and a nut (2031).

5. The thermomagnetic overload alarm adjustable non-tripping current protection module according to claim 4, wherein the alarm half shaft (202) can move axially through a knob (500) arranged, the lower end of the knob (500) is inserted into the middle of a 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 supporting part (2021) and the wedge block (101) is adjusted.

6. The adjustable non-tripping current protection module for the thermomagnetic overload alarm as claimed in claim 1, wherein the second elastic reset element 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.

7. The adjustable non-tripping current protection module for the thermomagnetic overload alarm of claim 1, wherein the locking 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 locking rod, and the alarm half shaft (202) has a certain rotation allowance around the cylindrical rod in the middle of the locking rod.

8. A circuit breaker with a thermo-magnetic overload alarm adjustable no-trip current protection module as claimed in any one of claims 1 to 7.