CN112885660A

CN112885660A - Thermomagnetic overload alarm adjustable non-tripping current protection module and circuit breaker

Info

Publication number: CN112885660A
Application number: CN201911199302.5A
Authority: CN
Inventors: 赵轶磊
Original assignee: Shanghai Electric Co ltd People Electric Factory
Current assignee: Shanghai Electric Co ltd People Electric Factory
Priority date: 2019-11-29
Filing date: 2019-11-29
Publication date: 2021-06-01
Anticipated expiration: 2039-11-29
Also published as: CN112885660B

Abstract

The invention relates to a thermomagnetic overload alarm adjustable non-tripping current protection module and a circuit breaker, which comprise a module base, an electromagnetic assembly, a locking rod mechanism and a reset push rod, wherein the electromagnetic assembly 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 enable the alarm half shaft to deflect, and the 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 locking rod to enable the hook to be tripped from the reset push rod, and after tripping is performed, the reset push rod pushes the tripping shaft of the circuit breaker mechanism to disconnect the main circuit of the circuit breaker. Compared with the prior art, the protection module has compact integral structure, and can realize short-circuit protection, overload alarm and adjustable functions after being installed in the 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 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. The overload tripping system comprises a thermal element and a bimetallic strip which are stacked on a boss at the bottom of the bracket, the thermal element and/or the bimetallic strip are connected in series in a circuit by soft coupling to sense an overload signal, and a resistor disc is connected to the thermal element and/or the bimetallic strip in series to increase the heat productivity.

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.

Disclosure of Invention

The invention aims to solve the problems and provides a thermomagnetic overload alarm adjustable non-tripping current protection module and a circuit breaker.

The purpose of the invention is realized by the following technical scheme:

a thermomagnetic overload alarm adjustable tripping-free 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.

Further, the second elastic reset piece comprises two springs, including a spring C and a spring D.

Furthermore, 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.

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

1. the module is structurally arranged, short-circuit protection and overload alarm are simultaneously realized without tripping in a limited space range, the magnet yoke in the electromagnetic assembly is internally provided with the electromagnetic coil unit, the magnet yoke is externally provided with the bimetallic strip and the thermal element, the bimetallic strip and the thermal element respectively respond to a short-circuit or overload process and are matched with the lock catch rod mechanism to realize the disconnection protection or alarm of the circuit breaker, and the protection module can be arranged in a plastic shell circuit breaker of a 63A shell frame, has reliable action, compact structure and small volume.

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 module is also provided with a button for manually controlling the turning of the pull rod, so that the manual tripping function can be realized.

Drawings

FIG. 1 is a schematic view 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 diagram 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 structural view of the latch lever mechanism of the present invention;

fig. 8 is a schematic structural view of the locking lever of the present invention;

FIG. 9 is a schematic structural view of the alarm 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 the latch lever mechanism of the module in a normal reset state in accordance with the present invention;

FIG. 12 is a schematic view of a module overload warning state according to the present invention;

fig. 13 is a schematic view of a latch lever mechanism for an overload alarm condition of a module in accordance with the present invention;

figure 14 is a schematic view of the module of the present invention mounted to a circuit breaker;

in the figure:

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

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

300 module base, 301 limit block;

400 tripper face cover;

500 knob; 501 grooves;

600 resetting push rods and 601 third elastic resetting pieces;

700 buttons, 701 spring B;

800 mechanism trip shaft;

900 microswitch, support 901.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments.

Referring to fig. 1, 2 and 3, an adjustable current protection module with a thermal-magnetic overload alarm and without tripping, taking a four-pole circuit breaker as an example, 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. 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 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. 7, 8 and 9, the lock catch lever mechanism 200 includes a lock catch lever 201 and an alarm half-shaft 202 nested with the lock catch lever 201, the lock catch lever includes a middle cylindrical lever and flanges disposed at two ends of the cylindrical lever, the alarm half-shaft 202 is a semi-cylindrical shell structure, the alarm half-shaft 202 is nested on the lock catch lever, the alarm half-shaft 202 is rotatable relative to the lock catch lever 201, and the alarm half-shaft 202 has a certain rotation allowance around the middle cylindrical lever of the lock catch 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.

The alarm half shaft 202 can axially move through the arranged knob 500, the lower end of the knob 500 is inserted into the middle of the groove of the alarm half shaft 202, the alarm half shaft is driven to slide when the knob 500 is rotated, the distance between the supporting part 2021 and the wedge block (101) is adjusted, and the relative distance determines the current overload to realize module tripping, so that the overload adjustable function is realized.

The module is also 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 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 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 and 11 are schematic diagrams 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. 12 and 13, the bimetal 104 is heated and bent to make the wedge 101 push against the adjusting screw, so that the alarm half shaft 202 rotates against the acting 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 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, so that a user can press the button 700 from the outside to push the pull rod 102 to turn the pull rod, 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 as an electric leakage module.

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.

The embodiments described above are described to facilitate an 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 based on the disclosure of the present invention.

Claims

1. The utility model provides an adjustable current protection module that does not detain of thermomagnetic formula overload alarm 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 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);

in a normal reset state, 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), so that the alarm half shaft (202) deflects, and a pressing sheet (2022) on the alarm half shaft (202) is contacted with the microswitch (900) to alarm;

when the current is short-circuited, the electromagnetic assembly (100) acts on the lock catch rod (201), so that the hook (2012) and the reset push rod (600) are tripped, and after the tripping, the reset push rod (600) pushes a tripping shaft (800) of a circuit breaker mechanism to disconnect a main circuit of the circuit breaker.

2. The thermomagnetic overload alarm adjustable non-tripping current protection module according to claim 1, wherein a trip device cover (400) is further disposed on the upper portion of the module base (300), and the electromagnetic assembly (100) and the latch mechanism (200) are covered by the trip device cover (400).

3. The adjustable thermomagnetic overload alarm non-tripping current protection module according to claim 1, wherein the electromagnetic assemblies (100) are arranged in 3-5 groups, and are arranged in a row in the module base (300), and then the loading limit blocks (301) define the initial position of the pull rod (102).

4. 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), when the short circuit state occurs, the current in the coil (107) is increased, and the armature (114) moves downwards to drive the pull rod (102) to overturn.

5. The adjustable thermomagnetic overload alarm non-tripping current protection module according to claim 4, wherein the pull rod (102) is rotatably disposed on the yoke (108) via a shaft B (103), the first elastic reset member comprises a shaft C (116) disposed on the pull rod (102) and a spring C (115) sleeved on the shaft C (116), the shaft C (116) is parallel to the shaft B (103), and the spring C (115) has an acting force for overturning the pull rod (102).

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

7. The thermomagnetic overload alarm adjustable non-tripping current protection module according to claim 6, wherein the alarm half-shaft (202) is axially movable by means of a knob (500), 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, so as to adjust the distance between the support portion (2021) and the wedge block (101).

8. Thermomagnetic overload alarm adjustable non-tripping current protection module according to 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.

9. The thermomagnetic overload alarm adjustable non-tripping current protection module according to claim 1, wherein the locking bar comprises a middle cylindrical bar and flanges arranged at two ends of the cylindrical bar, the alarm half-shaft (202) is of a semi-cylindrical shell structure, the alarm half-shaft (202) is nested on the locking bar, and the alarm half-shaft (202) has a certain rotation margin around the middle cylindrical bar of the locking bar.

10. A circuit breaker with a thermomagnetic overload warning adjustable trip free current protection module as claimed in any one of claims 1 to 9.