Molded case circuit breaker

Abstract

The utility model belongs to the technical field of circuit breakers, and particularly relates to a molded case circuit breaker, which comprises a shell, a thermal release, an electromagnetic release and a current adjusting mechanism, and is characterized in that the current adjusting mechanism comprises an overload adjusting assembly and a current adjusting assembly, the overload adjusting assembly comprises a traction rod and a linkage rod, the traction rod is connected with the thermal release, the traction rod is provided with a sliding groove, and the linkage rod is provided with a sliding block; the instantaneous adjusting assembly comprises a rotating rod and a current spring, the rotating rod is rotatably arranged in the shell, and one end of the current spring is connected with the rotating rod; the control assembly comprises a fixing support, a first rotary knob and a second rotary knob, the fixing support is arranged in the shell, and the first rotary knob and the second rotary knob are rotatably installed on the fixing support; the beneficial effects of the utility model are that the first knob is rotated to drive the linkage rod to be close to or far away from the thermal bimetallic strip, thereby realizing overload current protection value adjustment. The elastic force generated by the current spring is controlled by rotating the second knob, so that the instantaneous current protection value is adjusted; operation is convenient, the structure is simple, and practicability is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of circuit breakers, and in particular relates to a molded case circuit breaker. Background Art

[0002] The protection functions of molded case circuit breakers mainly include thermal overload protection, short circuit protection, time delay protection, electronic protection and leakage protection, etc. When implementing protection, circuit breakers as traditional mechanical structures generally focus on thermal overload protection and short circuit protection.

[0003] At present, most of the releasers in molded case circuit breakers use thermal-magnetic releasers, which have two functions: thermal release and electromagnetic release, which correspond to overload current protection and instantaneous current protection respectively, and can adjust the current protection value. However, the thermal-magnetic release structure in most molded case circuit breakers is too complicated, resulting in unreliable adjustment of the current protection value, which affects the use. Utility Model Content

[0004] The purpose of the utility model is to provide a molded case circuit breaker to solve the above-mentioned technical problems.

[0005] In view of this, the utility model provides a molded case circuit breaker, comprising a housing, a thermal release, an electromagnetic release and a current regulating mechanism, wherein the current regulating mechanism is used to adjust the overload protection current value of the thermal release and the instantaneous protection current value of the electromagnetic release, and the current regulating mechanism comprises:

[0006] An overload regulating assembly, the overload regulating assembly comprising a traction rod and a linkage rod, the traction rod being arranged in the housing and connected to the thermal release, the traction rod being provided with a slide groove, the linkage rod being provided with a slider, and the slider being movably connected to the slide groove along the X direction;

[0007] An instantaneous adjustment component, the instantaneous adjustment component comprises a rotating rod and a current spring, the rotating rod is rotatably arranged in the housing, and one end of the current spring is connected to the rotating rod;

[0008] A control assembly, the control assembly comprising a fixed bracket, a first knob and a second knob, the fixed bracket is arranged in the housing, and the first knob and the second knob can be rotatably mounted on the fixed bracket;

[0009] Among them, the first knob is used to drive the slider to move along the X direction, the second knob is used to drive the rotation along the circumferential direction, the thermal release includes a thermal bimetallic strip, the thermal bimetallic strip is used to bend under heat to abut the linkage rod, and the electromagnetic release includes an armature, the armature is connected to the other end of the current spring, and is used to move and abut the linkage rod under the action of electromagnetic force.

[0010] Furthermore, the linkage rod is also provided with a connecting frame, and the connecting frame is provided with a limiting groove;

[0011] The first knob further comprises a connecting rod, one end of which is connected to the outer periphery of the first knob, and the other end of which is located in the limiting groove.

[0012] Furthermore, a spiral connection block is provided at the bottom of the second knob, and a protrusion is provided on the rotating rod;

[0013] Wherein, the protrusion abuts against the spiral inclined surface of the connecting block.

[0014] Furthermore, the convex block is provided with a protrusion, and the protrusion abuts against the inner wall of the connecting block.

[0015] Furthermore, the rotating rod is provided with a hook, and the hook is connected to one end of the current spring.

[0016] Furthermore, a weight-reducing groove is provided on the fixing bracket.

[0017] Furthermore, the fixing bracket is provided with reinforcing ribs.

[0018] Furthermore, a limiting block is provided on the fixing bracket, and a limiting portion for abutting against the limiting block is provided on both the first knob and the second knob.

[0019] The beneficial effects of the utility model are:

[0020] By turning the first knob to drive the linkage rod closer to or away from the thermal bimetal, the thermal bimetal requires a smaller or larger current to abut against the linkage rod to trip the switch, thereby achieving an adjustable overload current protection value of the circuit breaker. By turning the second knob to control the elastic force generated by the current spring, the armature requires a larger or smaller electromagnetic force to move to trip the switch, thereby achieving an adjustable instantaneous current protection value of the circuit breaker. The operation is convenient, the structure is simple, and the practicability is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a partial structural schematic diagram of the utility model;

[0022] Figure 2 It is a partial structural schematic diagram of another viewing angle of the utility model;

[0023] Figure 3 It is a partial structural schematic diagram of another viewing angle of the utility model;

[0024] The symbols in the figure are:

[0025] 1. Traction rod; 11. Slide groove; 2. Linking rod; 21. Sliding block; 22. Connecting frame; 23. Limiting groove; 24. Contact block; 3. Rotating rod; 31. Bump; 32. Protrusion; 33. Hook; 4. Current spring; 5. Fixed bracket; 51. Weight reduction groove; 52. Reinforcing rib; 6. First knob; 61. Connecting rod; 7. Second knob; 71. Connecting block; 8. Thermal bimetallic strip; 81. Stop screw; 9. Armature. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0027] In the description of the present application, it should be noted that the terms used here are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0028] Embodiment 1:

[0029] This embodiment provides a molded case circuit breaker, including a housing, a thermal release, an electromagnetic release and a current regulating mechanism, wherein the current regulating mechanism is used to adjust the overload protection current value of the thermal release and the instantaneous protection current value of the electromagnetic release, and the current regulating mechanism includes:

[0030] An overload regulating assembly, the overload regulating assembly comprising a traction rod 1 and a linkage rod 2, the traction rod 1 being arranged in the housing and connected to the thermal release, the traction rod 1 being provided with a slide groove 11, the linkage rod 2 being provided with a slider 21, the slider 21 being connected to the slide groove 11 so as to be movable along the X direction;

[0031] An instantaneous adjustment component, the instantaneous adjustment component comprises a rotating rod 3 and a current spring 4, the rotating rod 3 is rotatably arranged in the housing, and one end of the current spring 4 is connected to the rotating rod 3;

[0032] A control assembly, the control assembly comprising a fixed bracket 5, a first knob 6 and a second knob 7, the fixed bracket 5 is arranged in the housing, and the first knob 6 and the second knob 7 can be rotatably mounted on the fixed bracket 5;

[0033] Among them, the first knob 6 is used to drive the slider 21 to move along the X direction, the second knob 7 is used to drive the rotation along the circumferential direction, the thermal release includes a thermal bimetal 8, and the thermal bimetal 8 is used to bend under heat to abut the linkage rod 2. The electromagnetic release includes an armature 9, and the armature 9 is connected to the other end of the current spring 4 and is used to move and abut the linkage rod 2 under the action of electromagnetic force.

[0034] In the present technical solution, the thermal release and the electromagnetic release are installed in the housing (the thermal release, the electromagnetic release and the housing are not shown in the specification). The thermal bimetal 8 of the thermal release is a double-layer material formed by welding or pressing two metals with different linear thermal expansion coefficients, and a stop screw 81 is installed on one end of the thermal bimetal 8. Under normal working conditions of the circuit breaker, the thermal bimetal 8 maintains a balanced state and will not bend. When the current overload causes the fuse to heat up, the metal will deform after being heated. Due to the different thermal expansion coefficients of the two metals, the thermal bimetal 8 will bend to the side close to the linkage rod 2 after being heated. The stop screw 81 abuts against the linkage rod 2 and pushes the linkage rod 2 to move, driving the traction rod 1 to move, so that the thermal release connected to the traction rod 1 is actuated, the contacts of the circuit breaker are opened, and the circuit is cut off to play a protective role.

[0035] like Figure 1 As shown, a contact block 24 is provided on the side of the linkage rod 2 close to the thermal bimetal 8. The contact block 24 is in the shape of a ramp. By turning the first knob 6, the linkage rod 2 is driven to move along the X direction, so that the inclined surface of the contact block 24 on the linkage rod 2 is close to or away from the stop screw 81. When the inclined surface of the contact block 24 is close to the stop screw 81, the gap between the inclined surface of the contact block 24 and the stop screw 81 becomes smaller, and the required bending degree of the thermal bimetal 8 becomes smaller, then a smaller current is required to bend the thermal bimetal 8, causing the stop screw 81 to contact the linkage rod 2, pushing the traction rod 1 to move, and causing the switch to trip; on the contrary, when the inclined surface of the contact block 24 is away from the stop screw 81, a larger current is required to bend the thermal bimetal 8 to achieve the switch trip.

[0036] like Figure 3As shown, when the electromagnetic release is working, the armature 9 will be attracted or pushed by the electromagnetic force generated by the electromagnetic coil, and the movement of the armature 9 causes the contacts of the circuit breaker to open or close, thereby realizing the tripping function of the circuit breaker and ensuring the safe operation of the circuit. By turning the second knob 7 to drive the rotating rod 3 to rotate circumferentially, the current spring 4 is stretched, and the elastic force generated by the current spring 4 becomes larger, requiring a larger electromagnetic force to drive the armature 9 to move, and correspondingly a larger current is required to drive the armature 9 to operate to trip the switch; conversely, when the second knob 7 is turned to drive the rotating rod 3 to rotate circumferentially in the opposite direction, the elastic force generated by the current spring 4 becomes smaller, and the corresponding current required to drive the armature 9 to operate also becomes smaller. The instantaneous current protection value is adjustable.

[0037] In summary, through the above structural design, by turning the first knob 6 to drive the linkage rod 2 close to or away from the thermal bimetal 8, the thermal bimetal 8 needs a smaller or larger current to abut against the linkage rod 2 to trip the switch, thereby realizing the adjustable overload current protection value of the circuit breaker. By turning the second knob 7 to control the elastic force generated by the current spring 4, the armature 9 needs a larger or smaller electromagnetic force to move to trip the switch, thereby realizing the adjustable instantaneous current protection value of the circuit breaker. The operation is convenient, the structure is simple, and the practicability is higher.

[0038] Embodiment 2:

[0039] This embodiment provides a molded case circuit breaker, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0040] Furthermore, the linkage rod 2 is further provided with a connecting frame 22, and the connecting frame 22 is provided with a limiting groove 23;

[0041] The first knob 6 further includes a connecting rod 61 , one end of which is connected to the outer periphery of the first knob 6 , and the other end of which is located in the limiting groove 23 .

[0042] In this technical solution, if Figure 2 As shown, the staff drives the connecting rod 61 to rotate along the outer circumference of the first knob 6 by turning the first knob 6, and the connecting rod 61 abuts against the inner wall of the limiting groove 23 of the connecting frame 22. During the rotation of the connecting rod 61, the connecting frame 22 is pushed to move along the X direction, thereby driving the linkage rod 2 to move along the X direction.

[0043] Embodiment 3:

[0044] This embodiment provides a molded case circuit breaker, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0045] Furthermore, a spiral connection block 71 is provided at the bottom of the second knob 7, and a protrusion 31 is provided on the rotating rod 3;

[0046] The protrusion 31 abuts against the spiral slope of the connecting block 71 .

[0047] In this technical solution, if Figure 3 As shown, the staff turns the second knob 7 so that the spiral slopes at different heights of the connecting block 71 abut against the protrusion 31, thereby pushing the rotating rod 3 to rotate on the fixed bracket 5, thereby changing the stretching amount of the current spring 4, affecting the size of the electromagnetic force required to drive the armature 9 to move.

[0048] Furthermore, a protrusion 32 is provided on the protrusion 31, and the protrusion 32 abuts against the inner wall of the connecting block 71. The protrusion 32 is hemispherical, and the protrusion 32 can play a certain limiting role on the connecting block 71, thereby preventing the second knob 7 from deviating, making the rotation of the connecting block 71 more stable, so that the thrust applied by the connecting block 71 to the protrusion 31 during the rotation process can also be more stable, preventing the occurrence of unreliable adjustment action.

[0049] Embodiment 4:

[0050] This embodiment provides a molded case circuit breaker, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0051] Furthermore, a hook 33 is provided on the rotating rod 3 , and the hook 33 is connected to one end of the current spring 4 .

[0052] In this technical solution, one end of the current spring 4 is connected and fixed to the armature 9, and the other end is sleeved on the hook 33. Through this structural design, the stretching of the current spring 4 is more stable and reliable, thereby making the adjustment of the instantaneous current protection value more reliable.

[0053] Embodiment 5:

[0054] This embodiment provides a molded case circuit breaker, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0055] Furthermore, a limiting block is provided on the fixing bracket 5 , and a limiting portion for abutting against the limiting block is provided on both the first knob 6 and the second knob 7 .

[0056] In the present technical solution, through this structural design, the rotation of the first knob 6 and the second knob 7 can be limited to prevent the first knob 6 and the second knob 7 from unlimited rotation, and when the limit part of the knob conflicts with one end of the limit block, it indicates that it has been adjusted to the maximum value of the current protection, and vice versa, when it conflicts with the other end of the limit block, it indicates that it has been adjusted to the minimum value of the current protection, which is convenient for staff to identify and operate, and is simple and practical.

[0057] Embodiment 6:

[0058] This embodiment provides a molded case circuit breaker, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0059] Furthermore, a weight-reducing groove 51 is provided on the fixing bracket 5 .

[0060] In the present technical solution, the weight of the fixing bracket 5 is reduced by providing the weight-reducing groove 51, the use of materials is reduced, the manufacturing cost is reduced, and the structure of the fixing bracket 5 is made lighter and easier to install.

[0061] Furthermore, the fixing bracket 5 is also provided with a reinforcing rib 52. The reinforcing rib 52 is provided on the peripheral side of the weight-reducing groove 51. By providing the reinforcing rib 52, the bending strength and torsional rigidity of the fixing bracket 5 around the weight-reducing groove 51 are increased, and the stress concentration of the fixing bracket 5 due to the weight-reducing groove 51 is prevented, thereby effectively improving the structural strength and rigidity of the fixing bracket 5, improving the durability, and extending the service life.

[0062] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A molded case circuit breaker, comprising a housing, a thermal release, an electromagnetic release and a current regulating mechanism, wherein the current regulating mechanism is used to adjust the overload protection current value of the thermal release and the instantaneous protection current value of the electromagnetic release, characterized in that: The current regulating mechanism comprises: An overload regulating assembly, the overload regulating assembly comprising a traction rod (1) and a linkage rod (2), the traction rod (1) being arranged in a housing and connected to a thermal release, the traction rod (1) being provided with a slide groove (11), the linkage rod (2) being provided with a slider (21), the slider (21) being connected to the slide groove (11) so as to be movable along an X direction; A momentary adjustment component, the momentary adjustment component comprising a rotating rod (3) and a current spring (4), the rotating rod (3) being rotatably arranged in a housing, and one end of the current spring (4) being connected to the rotating rod (3); A control assembly, the control assembly comprising a fixed bracket (5), a first knob (6) and a second knob (7), the fixed bracket (5) being arranged in a housing, and the first knob (6) and the second knob (7) being rotatably mounted on the fixed bracket (5); The first knob (6) is used to drive the slider (21) to move along the X direction, the second knob (7) is used to drive the rotation along the circumferential direction, the thermal release comprises a thermal bimetallic strip (8), the thermal bimetallic strip (8) is used to bend under heat to abut against the linkage rod (2), and the electromagnetic release comprises an armature (9), the armature (9) is connected to the other end of the current spring (4), and is used to move under the action of electromagnetic force to abut against the linkage rod (2).

2. A molded case circuit breaker according to claim 1, characterized in that: The linkage rod (2) is also provided with a connecting frame (22), and the connecting frame (22) is provided with a limiting groove (23); The first knob (6) further comprises a connecting rod (61), one end of which is connected to the outer periphery of the first knob (6) and the other end of which is located in the limiting groove (23).

3. A molded case circuit breaker according to claim 1, characterized in that: A spiral connection block (71) is also provided at the bottom of the second knob (7), and a protrusion (31) is also provided on the rotating rod (3); The protrusion (31) abuts against the spiral slope of the connecting block (71).

4. A molded case circuit breaker according to claim 3, characterized in that: The convex block (31) is also provided with a protrusion (32), and the protrusion (32) abuts against the inner wall of the connecting block (71).

5. The molded case circuit breaker according to claim 1, characterized in that: The rotating rod (3) is also provided with a hook (33), and the hook (33) is connected to one end of the current spring (4).

6. A molded case circuit breaker according to claim 1, characterized in that: The fixed bracket (5) is provided with a limit block, and the first knob (6) and the second knob (7) are both provided with a limit portion for abutting against the limit block.

7. The molded case circuit breaker according to claim 1, characterized in that: The fixing bracket (5) is also provided with a weight-reducing groove (51).

8. The molded case circuit breaker according to claim 1, characterized in that: The fixing bracket (5) is also provided with reinforcing ribs (52).

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