A low-voltage molded case circuit breaker

Abstract

A low-voltage molded case circuit breaker, which relates to the technical field of power equipment, includes a tripping mechanism, an arc extinguishing strengthening mechanism, and a temperature protection mechanism; the tripping mechanism includes: a base, a housing, a conductive movable plate, a gear, a latch I, a support frame, a slide rail I, an electric push rod, a pushing connection plate, a reset connection plate, and a reset spring I; the housing is fixedly installed on the base by screws; the conductive movable plate is slidably installed on the slide rod on the base, the conductive movable plate is meshed with the gear, and the shaft of the gear is rotatably installed in the circular hole of the low leg on the base; in addition to the conventional arc extinguishing cover, the connection between the conductive movable plate and the conductive connection piece II of the arc extinguishing strengthening mechanism of the present invention adopts a sliding connection, which can greatly reduce the generation range of the arc, and a rubber protection cover is installed on the conductive movable plate to prevent the diffusion of the arc. Therefore, on the basis of the arc extinguishing of the arc extinguishing cover, the diffusion of the arc can be prevented, and the arc can be controlled within the range covered by the arc extinguishing cover.

Description

Technical Field

[0001] The present invention relates to the technical field of power equipment, and particularly relates to a low-voltage molded case circuit breaker. Background Art

[0002] A low-voltage molded case circuit breaker is a circuit protection device with a compact structure and perfect functions. Its working principle is mainly based on current detection and protection mechanisms. By means of the internal thermoelectric bimetal sheet and electromagnetic coil to monitor the current change, when the current in the circuit exceeds the set value, the heat causes the bimetal sheet to bend, or the electromagnetic coil generates magnetic force, so as to quickly cut off the circuit to protect electrical equipment from damage.

[0003] The arc extinguishing mechanism of the existing circuit breaker only dissipates the arc by one arc extinguishing cover, and the diffusion range of the arc cannot be well controlled, and there is still a certain danger; and in the case of overload or short circuit of the existing circuit breaker, there is no treatment plan for the high temperature inside, which is easy to damage the components. Summary of the Invention

[0004] The present invention discloses a low-voltage molded case circuit breaker, which can effectively solve the problems in the background art. In addition to the conventional arc extinguishing cover, the connection between the conductive movable plate and the conductive connection piece II of the arc extinguishing strengthening mechanism of the present invention adopts a sliding connection, which can greatly reduce the generation range of the arc, and a rubber protection cover is installed on the conductive movable plate to prevent the diffusion of the arc, so that on the basis of the arc extinguishing of the arc extinguishing cover, the diffusion of the arc can be prevented, and the arc is controlled within the range covered by the arc extinguishing cover; the present invention also has a temperature protection mechanism. When the device is overloaded or short-circuited, the bimetal sheet or the electromagnetic solenoid will generate high temperature, which will cause the temperature to rise in the narrow space inside the device, and it is easy to damage the electronic components. When the temperature protection mechanism of the present invention trips, the clamping rod can be separated from the contact of the baffle, so that under the action of the tension spring, the baffle is opened to generate a ventilation opening to the outside, and then the fan starts to quickly take out the internal high temperature. When the latch I is latched again, the clamping rod presses the inclined surface on the baffle to close the baffle; the breaking mechanism of the present invention adopts a design with a more compact structural space, which can greatly reduce the overall volume of the device.

[0005] A low-voltage molded case circuit breaker includes a tripping mechanism, an arc extinguishing enhancement mechanism, and a temperature protection mechanism. The tripping mechanism includes: a base, a housing, a conductive movable plate, a gear, a latch I, a support frame, a slide rail I, an electric push rod, a push connecting plate, a reset connecting plate, and a reset spring I. The housing is fixedly installed on the base by screws. The conductive movable plate is slidably installed on a slide rod on the base, and the conductive movable plate meshes with the gear. The shaft of the gear is rotatably installed in a circular hole of a lower leg on the base. At the same time, the gear meshes with the latch I. The latch I is slidably installed on the slide rail I, and the slide rail I is fixedly installed on a higher leg on the base. The support frame is fixedly installed on the base, the electric push rod is fixedly installed on the support frame, the piston rod of the electric push rod abuts against one side of the push connecting plate, and the push connecting plate is fixedly connected to three latches I to connect the three latches I. The reset connecting plate is slidably installed on the slide rail I, the protrusion on the reset connecting plate contacts the three latches I, the reset spring I is installed at the end of the slide rail I, one end of the reset spring I contacts the end face of the slide rail I, and the other end contacts the reset connecting plate.

[0006] Preferably, the tripping mechanism further includes: a conductive slider, a bimetallic strip, an electromagnetic solenoid, a conductive rod, a conductive connecting rod, a metal hammer head, a latch II, a conductive connection piece I, and a reset elastic piece. The conductive slider is fixedly installed on the base and is fixedly connected to the inner end of the conductive movable plate at the same time. The bimetallic strip is fixedly installed on the conductive rod, and the bimetallic strip contacts the extension plate below the latch II. One end of the conductive rod is fixedly connected to the conductive slider, and the other end is fixedly connected to one end of the conductive connecting rod. The other end of the conductive connecting rod is connected to the electromagnetic solenoid. The metal hammer head is slidably installed inside the electromagnetic solenoid and is provided with a spring inside. The spring generates a pulling force on the metal hammer head. The metal hammer head contacts the inner side of the short plate below the latch II. The shaft of the latch II is rotatably installed in a circular hole on the leg on the base. The inner end of the conductive connection piece I is connected to the electromagnetic solenoid, and the outer end is fixedly installed on the base. The reset elastic piece is fixedly installed on the base, and the reset elastic piece contacts the outer side of the short plate below the latch II.

[0007] Preferably, the arc extinguishing enhancement mechanism includes: a conductive connection piece II, a rubber protection cover, a reset spring II, a slide rail II, and an arc extinguishing cover. The conductive connection piece II is fixedly installed on the base, the conductive connection piece II contacts the conductive movable plate, the rubber protection cover is slidably installed in a chute on the side of the conductive movable plate, a slide rail II is fixedly installed on the protrusion on the rubber protection cover, and the slide rail II is slidably connected to a circular hole on the conductive movable plate. The reset spring II is installed on the slide rail II. One end of the reset spring II contacts the protrusion on the rubber protection cover, and the other end contacts the protrusion on the conductive movable plate. The arc extinguishing cover is fixedly installed on the conductive connection piece II.

[0008] Preferably, the temperature protection mechanism includes: side plates, a baffle, a tension spring, a latch rod, and a fan; the side plates are fixedly installed on the base, the baffle is slidably installed in the chute on the side plates, the inclined surface on the extension plate of the baffle contacts the latch rod, the latch rod is fixedly installed on the side of the latch I, one end of the tension spring is connected to the short rod on the side plates, and the other end is connected to the short rod on the baffle.

[0009] Preferably, the gear is made of plastic material.

[0010] Preferably, the extension plate of the baffle is provided with an inclined surface.

[0011] The beneficial effects of the present invention compared with the prior art are as follows:

[0012] 1. In addition to the conventional arc extinguishing cover, the connection between the conductive movable plate and the conductive connection piece II of the arc extinguishing strengthening mechanism of the present invention adopts a sliding connection, which can greatly reduce the generation range of the arc, and a rubber protection cover is installed on the conductive movable plate to prevent the diffusion of the arc. Therefore, on the basis of the arc extinguishing of the arc extinguishing cover, the diffusion of the arc can be prevented, and the arc can be controlled within the range covered by the arc extinguishing cover.

[0013] 2. The present invention is also provided with a temperature protection mechanism. When the device is overloaded or short-circuited, the bimetal sheet or the electromagnetic solenoid will generate high temperature, which will cause the temperature to rise in the narrow space inside the device and easily lead to the damage of electronic components. When the temperature protection mechanism of the present invention trips, the latch rod can be disengaged from the contact with the baffle, and then under the action of the tension spring, the baffle is opened to generate a ventilation opening to the outside. Subsequently, the fan starts to quickly take out the internal high temperature. When the latch I is latched again, the latch rod presses the inclined surface on the baffle to close the baffle.

[0014] 3. The structure of the circuit breaker mechanism of the present invention adopts a more compact design of the structural space, which can greatly reduce the overall volume of the equipment. Description of the Drawings

[0015] Figure 1 It is an isometric view of the overall structure of the present invention.

[0016] Figure 2 It is an internal structure isometric view of the overall structure of the present invention.

[0017] Figure 3 It is a side view of the internal structure of the overall structure of the present invention.

[0018] Figure 4 It is an overall structure diagram of the circuit breaker mechanism of the present invention.

[0019] Figure 5 It is a structure diagram of the base of the present invention.

[0020] Figure 6It is the first perspective view of the circuit-breaking mechanism of the present invention.

[0021] Figure 7 It is the second perspective view of the circuit-breaking mechanism of the present invention.

[0022] Figure 8 It is the third perspective view of the circuit-breaking mechanism of the present invention.

[0023] Figure 9 It is the structural diagram of the arc-extinguishing strengthening mechanism of the present invention without the arc-extinguishing cover.

[0024] Figure 10 It is the structural diagram of the arc-extinguishing mechanism of the present invention with the arc-extinguishing cover.

[0025] Figure 11 It is the structural diagram of the temperature protection mechanism of the present invention.

[0026] Figure 12 For the present invention Figure 11 The enlarged view at position A.

[0027] Figure 13 It is the structural schematic diagram of the baffle of the present invention.

[0028] Reference numerals in the attached drawings: 1. Base; 2. Conductive movable plate; 3. Gear; 4. Lock Ⅰ; 5. Support frame; 6. Slide rail Ⅰ; 7. Electric push rod; 8. Push connecting plate; 9. Reset connecting plate; 10. Reset spring Ⅰ; 11. Conductive slider; 12. Bimetallic strip; 13. Electromagnetic solenoid; 14. Conductive rod; 15. Conductive connecting rod; 16. Metal hammer head; 17. Lock Ⅱ; 18. Conductive connection piece Ⅰ; 19. Reset elastic piece; 20. Conductive connection piece Ⅱ; 21. Rubber protection cover; 22. Reset spring Ⅱ; 23. Slide rail Ⅱ; 24. Arc-extinguishing cover; 25. Side plate; 26. Baffle; 27. Tensile spring; 28. Clamping rod; 29. Fan; 30. Outer shell. Detailed implementation manners

[0029] The technical solutions of the present invention will be further specifically described below through embodiments in conjunction with the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific implementations disclosed below.

[0030] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "upper", "lower", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invention product is usually placed during use. It is only for the convenience of describing the present invention patent and is not an indication or implication that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the present invention patent. In addition, in order to facilitate the description, spatial relative terms can be used in the text, such as "below", "beneath", "under", "above", "over", etc., to describe the relationship of one element or feature relative to other elements or features as shown in the drawings. The spatial relative terms are intended to include different orientations of the device in use or operation other than the orientation shown in the drawings. The device can have other orientations (rotated 90 degrees or in other orientations), and the spatial relative descriptive terms used in the text can be interpreted accordingly.

[0031] For example, Figures 1 - 13 As shown, a low-voltage plastic case circuit breaker includes a breaking mechanism, an arc extinguishing strengthening mechanism, and a temperature protection mechanism;

[0032] In an alternative embodiment of the embodiment of the present invention, as Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 As shown, the breaking mechanism includes: a base 1, a housing 30, a conductive movable plate 2, a gear 3, a latch I 4, a support frame 5, a slide rail I 6, an electric push rod 7, a push connecting plate 8, a reset connecting plate 9, and a reset spring I 10; the housing 30 is fixedly installed on the base 1 by screws; the conductive movable plate 2 is slidably installed on the slide rod on the base 1, the conductive movable plate 2 is engaged with the gear 3, the shaft of the gear 3 is rotatably installed in the round hole of the low leg on the base 1, and at the same time the gear 3 is engaged with the latch I 4, the latch I 4 is slidably installed on the slide rail I 6, and the slide rail I 6 is fixedly installed on the high leg on the base 1; the support frame 5 is fixedly installed on the base 1, the electric push rod 7 is fixedly installed on the support frame 5, the piston rod of the electric push rod 7 abuts against one side of the push connecting plate 8, the push connecting plate 8 is fixedly connected to the three latches I 4 to connect the three latches I 4; the reset connecting plate 9 is slidably installed on the slide rail I 6, the protrusion on the reset connecting plate 9 contacts the three latches I 4, the reset spring I 10 is installed at the end of the slide rail I 6, one end of the reset spring I 10 contacts the end face of the slide rail I 6, and the other end contacts the reset connecting plate 9.

[0033] In an alternative embodiment of the embodiment of the present invention, as Figure 4 , Figure 5 , Figure 6 , Figure 7 ,Figure 8 As shown in the figure, the open circuit mechanism further includes: a conductive slider 11, a bimetallic strip 12, an electromagnetic solenoid 13, a conductive rod 14, a conductive connecting rod 15, a metal hammer head 16, a latch II 17, a conductive terminal strip I 18, and a reset spring piece 19; the conductive slider 11 is fixedly installed on the base 1 and is fixedly connected to the inner end of the conductive movable plate 2 at the same time. The bimetallic strip 12 is fixedly installed on the conductive rod 14, and the bimetallic strip 12 is in contact with the extension plate below the latch II 17. One end of the conductive rod 14 is fixedly connected to the conductive slider 11, and the other end is fixedly connected to one end of the conductive connecting rod 15. The other end of the conductive connecting rod 15 is connected to the electromagnetic solenoid 13. The metal hammer head 16 is slidably installed inside the electromagnetic solenoid 13 and is provided with a spring inside. The spring generates a pulling force on the metal hammer head 16. The metal hammer head 16 is in contact with the inner side surface of the short board below the latch II 17. The shaft of the latch II 17 is rotatably installed in the circular hole on the leg of the base 1; the inner end of the conductive terminal strip I 18 is connected to the electromagnetic solenoid 13, and the outer end is fixedly installed on the base 1. The reset spring piece 19 is fixedly installed on the base 1, and the reset spring piece 19 is in contact with the outer side surface of the short board below the latch II 17.

[0034] In an alternative embodiment of the embodiment of the present invention, as Figure 9 , Figure 10 As shown in the figure, the arc extinguishing strengthening mechanism includes: a conductive terminal strip II 20, a rubber protective cover 21, a reset spring II 22, a slide rail II 23, and an arc extinguishing cover 24; the conductive terminal strip II 20 is fixedly installed on the base 1, the conductive terminal strip II 20 is in contact with the conductive movable plate 2, the rubber protective cover 21 is slidably installed in the chute on the side of the conductive movable plate 2, a slide rail II 23 is fixedly installed on the protrusion of the rubber protective cover 21, and the slide rail II 23 is slidably connected to the circular hole on the conductive movable plate 2. The reset spring II 22 is installed on the slide rail II 23. One end of the reset spring II 22 is in contact with the protrusion of the rubber protective cover 21, and the other end is in contact with the protrusion of the conductive movable plate 2; the arc extinguishing cover 24 is fixedly installed on the conductive terminal strip II 20.

[0035] In an alternative embodiment of the embodiment of the present invention, as Figure 11 , Figure 12 , Figure 13 As shown in the figure, the temperature protection mechanism includes: a side plate 25, a baffle 26, a tension spring 27, a clamping rod 28, and a fan 29; the side plate 25 is fixedly installed on the base 1, the baffle 26 is slidably installed in the chute on the side plate 25, the inclined surface on the extension plate of the baffle 26 is in contact with the clamping rod 28, the clamping rod 28 is fixedly installed on the side of the latch I 4, and one end of the tension spring 27 is connected to the short rod on the side plate 25, and the other end is connected to the short rod on the baffle 26.

[0036] In an alternative embodiment of the embodiment of the present invention, as Figure 6As shown, the gear 3 is made of plastic material.

[0037] In an optional implementation manner of the embodiment of the present invention, as Figure 13 As shown, the baffle plate 26 is provided with an inclined surface on the extension plate.

[0038] Working principle: When the present invention is in use, the electric push rod 7 drives the connecting plate 8 to slide, thereby driving the lock buckle Ⅰ4 to slide toward the lock buckle Ⅱ17, so that the lock buckle Ⅰ4 is stuck with the lock buckle Ⅱ17, and the lock buckle Ⅰ4 drives the conductive movable plate 2 to slide outward through the gear 3, so that the conductive movable plate 2 is in contact with the conductive wiring piece Ⅱ20, so that the circuit is unobstructed. When a short circuit occurs in the circuit, the electromagnetic solenoid 13 will generate an instantaneous large current, thereby generating a magnetic field, driving the metal hammer head 16 to slide outward, thereby supporting the short plate under the lock buckle Ⅱ17, thereby driving the lock buckle Ⅱ17 to rotate, and the lock buckle Ⅱ17 is disengaged from the lock buckle Ⅰ4. The reset connecting plate 9 pushes the lock buckle Ⅰ4 to slide outward under the action of the reset spring Ⅰ10, so that the conductive movable plate 2 is disconnected from the conductive wiring piece Ⅱ20, thereby disconnecting the circuit; when the circuit is over When the load is on, the temperature of the bimetallic strip 12 rises and the bimetallic strip 12 is deformed. The deformed bimetallic strip 12 moves the extension plate under the lock buckle II 17, so that the lock buckle II 17 is separated from the lock buckle I 4, and the power can be cut off. Regardless of whether it is a short circuit or an overload, one of the parts of the bimetallic strip 12 or the electromagnetic solenoid 13 will be hot. When the lock buckle II 17 is disconnected from the lock buckle I 4, the clamping rod 28 on the lock buckle I 4 will be separated from the inclined surface on the baffle 26, so that the baffle 26 slides upward under the action of the tension spring 27, opening the through hole to the outside world, and then the fan 29 starts to blow out the hot air inside and take out the heat, thereby completing the cooling and preventing damage to the components. When the device is closed again, the clamping rod 28 will squeeze the inclined surface on the baffle 26 again, thereby driving the baffle 26 to slide downward and close the through hole.

[0039] At the moment when the device is closed or disconnected, an arc will be generated on the contact surface of the conductive movable plate 2 and the conductive wiring piece II 20, and the arc needs to be controlled. An arc extinguishing cover 24 is installed on the conductive wiring piece II 20, which can dissipate the arc extending in this direction, and a rubber protective cover 21 is installed on the conductive movable plate 2. The rubber protective cover 21 can cover the contact point between the conductive movable plate 2 and the conductive wiring piece II 20, and the rubber protective cover 21 always slides in the direction of the conductive wiring piece II 20 under the action of the reset spring II 22, which can cover the conductive movable plate 2 to the greatest extent, prevent the arc from spreading inward, and is safer.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low voltage molded case circuit breaker, characterized in that: The invention comprises a circuit breaker mechanism, an arc extinguishing reinforcement mechanism and a temperature protection mechanism; the circuit breaker mechanism comprises: a base (1), a shell (30), a conductive movable plate (2), a gear (3), a lock buckle I (4), a support frame (5), a slide rail I (6), an electric push rod (7), a push connecting plate (8), a reset connecting plate (9) and a reset spring I (10); the shell (30) is fixedly mounted on the base (1) by screws; the conductive movable plate (2) is slidably mounted on the slide rod on the base (1), the conductive movable plate (2) is meshed with the gear (3), the shaft of the gear (3) is rotatably mounted in the circular hole of the lower leg on the base (1), and the gear (3) is meshed with the lock buckle I (4), the lock buckle I (4) is slidably mounted on the slide rail I (6), and the slide rail I (6) is fixedly mounted on the high leg on the base (1); The support frame (5) is fixedly mounted on the base (1), the electric push rod (7) is fixedly mounted on the support frame (5), the piston rod of the electric push rod (7) presses against one side of the push connecting plate (8), the push connecting plate (8) is fixedly connected with the three lock buckles I (4), and the three lock buckles I (4) are connected; the reset connecting plate (9) is slidably mounted on the slide rail I (6), the protrusion on the reset connecting plate (9) contacts the three lock buckles I (4), the reset spring I (10) is mounted on the rear end of the slide rail I (6), one end of the reset spring I (10) contacts the rear end surface of the slide rail I (6), and the other end contacts the reset connecting plate (9), the lock buckle I (4) drives the conductive movable plate (2) to slide outward through the gear (3), so that the conductive movable plate (2) and the conductive wiring piece II (20) are in sliding contact to conduct the circuit.

2. A low voltage molded case circuit breaker according to claim 1, characterized in that: The circuit breaker mechanism further comprises: a conductive slider (11), a bimetallic strip (12), an electromagnetic solenoid (13), a conductive rod (14), a conductive connecting rod (15), a metal hammer head (16), a lock buckle II (17), a conductive connecting piece I (18), and a reset spring (19); the conductive slider (11) is fixedly mounted on the base (1) and is fixedly connected to the inner side end of the conductive movable plate (2); the bimetallic strip (12) is fixedly mounted on the conductive rod (14), the bimetallic strip (12) is in contact with an extension plate below the lock buckle II (17); one end of the conductive rod (14) is fixedly connected to the conductive slider (11), and the other end is fixedly connected to one end of the conductive connecting rod (15); The other end of the electric connecting rod (15) is connected to the electromagnetic solenoid (13), and the metal hammer head (16) is slidably installed inside the electromagnetic solenoid (13), and a spring is arranged inside the metal hammer head (16), and the spring generates a pulling force on the metal hammer head (16). The metal hammer head (16) contacts the inner side surface of the short plate below the lock buckle II (17), and the axis of the lock buckle II (17) is rotatably installed in the circular hole on the upper leg of the base (1); the inner side end of the conductive wiring piece I (18) is connected to the electromagnetic solenoid (13), and the outer side end is fixedly installed on the base (1), and the reset spring piece (19) is fixedly installed on the base (1), and the reset spring piece (19) contacts the outer side surface of the short plate below the lock buckle II (17).

3. A low voltage molded case circuit breaker according to claim 1, characterized in that: The arc extinguishing reinforcement mechanism comprises: a conductive connecting piece II (20), a rubber protective cover (21), a reset spring II (22), a slide rail II (23), and an arc extinguishing cover (24); the conductive connecting piece II (20) is fixedly mounted on the base (1); the conductive movable plate (2) can be movably contacted with or separated from the conductive connecting piece II (20); the rubber protective cover (21) is slidably mounted in a slide groove on the side of the conductive movable plate (2); the slide rail II (23) is fixedly mounted on the protrusion on the rubber protective cover (21); the slide rail II (23) is slidably connected to the circular hole on the conductive movable plate (2); the reset spring II (22) is mounted on the slide rail II (23); one end of the reset spring II (22) contacts the protrusion on the rubber protective cover (21), and the other end contacts the protrusion on the conductive movable plate (2); the arc extinguishing cover (24) is fixedly mounted on the conductive connecting piece II (20).

4. A low voltage molded case circuit breaker according to claim 1, characterized in that: The temperature protection mechanism comprises: a side plate (25), a baffle (26), a tension spring (27), a clamping rod (28), and a fan (29); the side plate (25) is fixedly mounted on the base (1), the baffle (26) is slidably mounted in a slide groove on the side plate (25), the inclined surface on the extension plate on the baffle (26) contacts the clamping rod (28), the clamping rod (28) is fixedly mounted on the side of the lock buckle I (4), one end of the tension spring (27) is connected to the short rod on the side plate (25), and the other end is connected to the short rod on the baffle (26).

5. A low voltage molded case circuit breaker according to claim 1, characterized in that: The gear (3) is made of plastic material.

6. A low voltage molded case circuit breaker according to claim 4, characterized in that: The baffle (26) has an inclined surface on its extension plate.

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