Molded case circuit breaker connecting plate

Abstract

The utility model relates to the technical field of molded case circuit breaker connecting plates, in particular to a molded case circuit breaker connecting plate, which comprises a conduction section, two ends of the conduction section are respectively and fixedly connected with an installation section and a contact section, the conduction section is sleeved and fixedly connected with a fixed frame, and the bottom of the inner wall of the fixed frame is fixedly connected with an upper pressing assembly. The upper end of the fixing frame is fixedly connected with a downward pressing assembly, the conduction section is slidably connected with a connecting rod in a penetrating mode, one end of the connecting rod is fixedly connected with a first pressing plate, the other end of the connecting rod is fixedly connected with a second pressing plate, the upper end of the second pressing plate is fixedly connected with an ejector rod, the upward pressing assembly and the downward pressing assembly are in extrusion fit with the first pressing plate and the second pressing plate respectively, and the lower end of the conduction section is fixedly connected with a bottom plate. When the driving plate and the driven plate are heated and bent, the upper pressing assembly extrudes the first pressing plate, the first pressing plate drives the ejector rod through the connecting rod and the second pressing plate to drive the circuit breaker to release, current returns to normal, the driving plate and the driven plate recover deformation, the upper pressing assembly and the lower pressing assembly are extruded to extrude the second pressing plate, and the ejector rod does not descend to drive the circuit breaker to release.

Description

Technical Field

[0001] The utility model relates to the field of connection plates of molded case circuit breakers, and specifically to a connection plate of a molded case circuit breaker. Background Art

[0002] A molded case circuit breaker is a device that automatically cuts off the current after the current exceeds the tripping setting. The molded case refers to using a plastic insulator as the housing of the device to isolate the conductors from each other and the grounded metal parts. A molded case circuit breaker usually contains a thermal-magnetic tripping unit, and the connection plate is a part in the thermal-magnetic tripping unit.

[0003] For example, in an electromagnetic protection device and an electronic molded case circuit breaker proposed in the patent application number "CN201720580535.X" of the existing molded case circuit breaker connection plate, through structures such as a connection plate, a push rod, an armature, and a return spring, when the connection plate passes through a short-circuit current, the generated magnetic field attracts the armature to move towards the connection plate against the elastic force of the return spring, and the armature drives the push rod to move upward to drive the circuit breaker to trip.

[0004] However, the existing technology has defects. It is only suitable for use under certain voltage conditions such as high voltage. In a low-voltage environment, the current on the connection plate is small, the magnetic field force generated on the armature is small, and it is difficult to overcome the elastic force of the return spring to attract the armature to move, resulting in its inability to drive the circuit breaker to trip in time. Therefore, a connection plate of a molded case circuit breaker is proposed. Content of the Utility Model

[0005] The purpose of the utility model is to provide a connection plate of a molded case circuit breaker to solve the problems raised in the above background art.

[0006] The purpose of the utility model can be achieved by the following technical solutions:

[0007] A connection plate of a molded case circuit breaker includes a conduction section. Installation sections and contact sections are respectively and fixedly connected to both ends of the conduction section. A fixed frame is sleeved and fixedly connected to the outside of the conduction section. An upper pressing component is fixedly connected to the bottom of the inner wall of the fixed frame, and a lower pressing component is fixedly connected to the upper end of the fixed frame;

[0008] A connecting rod is slidably connected to the conduction section in a penetrating manner. A first pressing plate is fixedly connected to one end of the connecting rod, and a second pressing plate is fixedly connected to the other end. A push rod is fixedly connected to the upper end of the second pressing plate. The upper pressing component and the lower pressing component are respectively in pressing cooperation with the first pressing plate and the second pressing plate. A bottom plate is fixedly connected to the lower end of the conduction section. A driving plate and a driven plate are fixedly connected to one end of the bottom plate, and both the driving plate and the driven plate are in pressing cooperation with the upper pressing component.

[0009] Preferably, the end of the upper pressing component is in pressing cooperation with the first pressing plate, the middle of the upper pressing component is in pressing cooperation with the driving plate and the driven plate. The expansion coefficients of the driving plate and the driven plate are different. The width of the installation section is greater than the width of the conduction section, and the width of the contact section is less than the width of the conduction section.

[0010] Preferably, the upper pressing assembly includes a first connecting shaft, which is fixedly connected inside the fixed frame and is located below the conduction section. A first upper pressing plate is rotatably connected to the first connecting shaft. The shape of the first upper pressing plate is set as an "S" shape. A first torsion spring is sleeved on the first connecting shaft. One end of the first torsion spring is in abutting cooperation with the inner wall of the fixed frame, and the other end is fixedly connected to the first upper pressing plate. The end of the first upper pressing plate is in pressing cooperation with the first pressing plate, and the middle of the first upper pressing plate is in pressing cooperation with the active plate and the passive plate.

[0011] Preferably, the lower pressing assembly includes a shaft seat, which is fixedly connected to the upper end of the fixed frame. A second connecting shaft is fixedly connected inside the shaft seat. A connecting plate is rotatably connected to the second connecting shaft. A second torsion spring is sleeved on the side wall of the second connecting shaft. One end of the second torsion spring is in abutting cooperation with the inner wall of the shaft seat, and the other end is fixedly connected to the connecting plate. A second lower pressing plate is fixedly connected to the end of the connecting plate. The second lower pressing plate is in pressing cooperation with the second pressing plate.

[0012] Preferably, the fixed frame is made of insulating material, and an insulating layer is coated on the side wall of the connecting rod, which is used to prevent conduction between the connecting rod and the conduction section.

[0013] Preferably, two groups of mounting ears are symmetrically and fixedly connected to the side wall of the fixed frame, and both groups of mounting ears are located at one end of the fixed frame close to the contact section.

[0014] Advantages of the present utility model:

[0015] In the present utility model, when the current of the circuit breaker exceeds the set value, the currents of the installation section, the conduction section and the contact section exceed the set value. The active plate and the passive plate are heated and bent. The upper pressing assembly presses the first pressing plate, so that the first pressing plate drives the ejector rod to trip the circuit breaker through the connecting rod and the second pressing plate. The elastic potential energy of the lower pressing assembly increases. When the current returns to normal, the active plate and the passive plate return to their original shapes, squeeze the upper pressing assembly, the lower pressing assembly presses the second pressing plate, and the elastic potential energy of the upper pressing assembly increases, so that the ejector rod will not drive the circuit breaker to trip when it descends. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings;

[0017] Figure 1 It is a front view structural diagram of the whole of the present utility model;

[0018] Figure 2 It is a rear view structural diagram of the whole of the present utility model;

[0019] Figure 3 It is a structural diagram of the bottom plate of the present utility model;

[0020] Figure 4It is a schematic diagram of the internal structure of the fixed frame of the present utility model;

[0021] Figure 5 It is a schematic diagram of the overall sectional structure of the present utility model;

[0022] The reference numerals in the figure are as follows:

[0023] 1. Conduction section; 2. Installation section; 3. Contact section; 4. Fixed frame; 5. Installation ear; 6. Bottom plate; 7. Passive plate; 8. Active plate; 9. First pressing plate; 10. Link; 11. Second pressing plate; 12. Thrust rod; 13. Interlayer; 14. First connecting shaft; 15. Upper pressing plate; 16. First torsion spring; 17. Shaft seat; 18. Second connecting shaft; 19. Second torsion spring; 20. Connecting plate; 21. Lower pressing plate. Specific embodiments

[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the protection scope of the present utility model.

[0025] A connecting plate of a plastic case circuit breaker, as Figures 1-5 shown, includes a conduction section 1. Installation sections 2 and contact sections 3 are fixedly connected to both ends of the conduction section 1 respectively. A fixed frame 4 is sleeved and fixedly connected to the outside of the conduction section 1. An upper pressing assembly is fixedly connected to the bottom of the inner wall of the fixed frame 4, and a lower pressing assembly is fixedly connected to the upper end of the fixed frame 4. The circuit breaker connecting plate includes structures such as an installation section 2, a conduction section 1, a contact section 3, and a fixed frame 4 provided on the side of the conduction section 1. The upper pressing assembly and the lower pressing assembly are respectively located inside and outside the fixed frame 4.

[0026] A link 10 is slidably connected to the conduction section 1 in a penetrating manner. A first pressing plate 9 is fixedly connected to one end of the link 10, and a second pressing plate 11 is fixedly connected to the other end. A thrust rod 12 is fixedly connected to the upper end of the second pressing plate 11. The upper pressing assembly and the lower pressing assembly are respectively in pressing cooperation with the first pressing plate 9 and the second pressing plate 11. A bottom plate 6 is fixedly connected to the lower end of the conduction section 1. An active plate 8 and a passive plate 7 are fixedly connected to one end of the bottom plate 6, and both the active plate 8 and the passive plate 7 are in pressing cooperation with the upper pressing assembly. When the temperature of the active plate 8 and the passive plate 7 rises to a certain degree, they will bend and deform, and will return to their original shape when the temperature is normal.

[0027] When the current of the circuit breaker exceeds the set value, the currents of the installation section 2, the conduction section 1, and the contact section 3 will exceed the set value. The temperature of the bottom plate 6 increases, and the active plate 8 and the passive plate 7 are heated and bent. The heights of the upper pressing components squeezed by the active plate and the passive plate 7 become smaller, and the upper pressing components start to squeeze the first pressing plate 9, causing the first pressing plate 9 to drive the ejector rod 12 through the connecting rod 10 and the second pressing plate 11 to trip the circuit breaker. The elastic potential energy of the lower pressing component increases. When the current returns to normal, the currents of the installation section 2, the conduction section 1, and the contact section 3 are within the set value, the temperature of the bottom plate 6 is normal, the active plate 8 and the passive plate 7 return to their deformed states, squeeze the upper pressing components, and the lower pressing components simultaneously squeeze the second pressing plate 11. The elastic potential energy of the upper pressing components increases, and the ejector rod 12 descends without tripping the circuit breaker.

[0028] The sum of the squeezing forces of the active plate 8 and the passive plate 7 on the upper pressing components and the squeezing force of the lower pressing components on the upper pressing components through the connecting rod 10 is greater than the squeezing force of the upper pressing components on the first pressing plate 9, and the squeezing force of the upper pressing components on the first pressing plate 9 is greater than the squeezing force of the lower pressing components on the second pressing plate 11.

[0029] As Figures 1-5 shown, the end of the upper pressing component is in extrusion fit with the first pressing plate 9, the middle of the upper pressing component is in extrusion fit with the active plate 8 and the passive plate 7. The expansion coefficients of the active plate 8 and the passive plate 7 are different. The width of the installation section 2 is greater than the width of the conduction section 1, and the width of the contact section 3 is less than the width of the conduction section 1.

[0030] When the active plate 8 and the passive plate 7 support and squeeze the middle of the upper pressing component, the lower pressing component squeezes the second pressing plate 11, causing the first pressing plate 9 to squeeze the upper pressing component. When the active plate 8 and the passive plate 7 are bent, the upper pressing component squeezes the first pressing plate 9, causing the second pressing plate 11 to squeeze the end of the lower pressing component. The degree of thermal deformation of the active plate 8 is greater than that of the passive plate 7. As the temperature rises, both will bend towards the direction of the passive plate 7, widening the installation section 2 of the connecting plate and hardening the upper end, enabling the connecting plate to cool down and heat up.

[0031] As Figures 4-5 shown, the upper pressing component includes a first connecting shaft 14. The first connecting shaft 14 is fixedly connected inside the fixed frame 4 and is located below the conduction section 1. A upper pressing plate 15 is rotatably connected to the first connecting shaft 14. The shape of the upper pressing plate 15 is set as an "S" shape. A first torsion spring 16 is sleeved on the first connecting shaft 14. One end of the first torsion spring 16 is in abutting fit with the inner wall of the fixed frame 4, and the other end is fixedly connected to the upper pressing plate 15. The end of the upper pressing plate 15 is in extrusion fit with the first pressing plate 9, and the middle of the upper pressing plate 15 is in extrusion fit with the active plate 8 and the passive plate 7.

[0032] The first torsion spring 16 always drives the upper pressing plate 15 to squeeze the first pressing plate 9, facilitating the reset of the upper pressing plate 15. The middle of the upper pressing plate 15 is abutted by the active plate 8 and the passive plate 7, and the end is in extrusion with the first pressing plate 9.

[0033] As Figure 1 、 Figure 4, Figure 5 As shown, the pressing component includes a shaft seat 17, which is fixedly connected to the upper end of the fixed frame 4. A second connecting shaft 18 is fixedly connected inside the shaft seat 17. A connecting plate 20 is rotatably connected to the second connecting shaft 18. A second torsion spring 19 is sleeved on the side wall of the second connecting shaft 18. One end of the second torsion spring 19 abuts and cooperates with the inner wall of the shaft seat 17, and the other end is fixedly connected to the connecting plate 20. A lower pressing plate 21 is fixedly connected to the end of the connecting plate 20, and the lower pressing plate 21 is in extrusion cooperation with the second pressing plate 11.

[0034] The second torsion spring 19 always drives the lower pressing plate 21 to press the second pressing plate 11 through the connecting plate 20, facilitating the reset of the lower pressing plate 21. The end of the lower pressing plate 21 presses against the upper end of the second pressing plate 11.

[0035] As Figure 4 shown, the fixed frame 4 is made of insulating material, and an insulating layer 13 is coated on the side wall of the connecting rod 10. The insulating layer 13 is used to prevent the connecting rod 10 from conducting electricity with the conduction section 1.

[0036] The fixed frame 4 is non-conductive, and the insulating layer 13 prevents the connecting rod 10 from conducting electricity with the conduction section 1, avoiding short-circuit of the connecting plate.

[0037] As Figure 1 shown, two sets of mounting ears 5 are symmetrically and fixedly connected to the side wall of the fixed frame 4, and both sets of mounting ears 5 are located at one end of the fixed frame 4 close to the contact section 3.

[0038] The mounting ears 5 facilitate the installation of the fixed frame 4 inside the circuit breaker and do not affect the installation of the installation section 2.

[0039] The working principle of a connecting plate of a molded case circuit breaker provided by the present utility model is as follows:

[0040] When the current of the circuit breaker exceeds the set value, the currents of the installation section 2, the conduction section 1, and the contact section 3 exceed the set value. The active plate 8 and the passive plate 7 are heated and bent. The upper pressing plate 15 presses the first pressing plate 9, so that the first pressing plate 9 drives the ejector rod 12 to drive the circuit breaker to trip through the connecting rod 10 and the second pressing plate 11. The elastic potential energy of the pressing component increases, and the current returns to normal. The active plate 8 and the passive plate 7 return to their original shapes, pressing the upper pressing plate 15. The lower pressing plate 21 presses the second pressing plate 11, and the elastic potential energy of the upper pressing component increases. The ejector rod 12 descends and does not drive the circuit breaker to trip.

[0041] The above shows and describes the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed.

Claims

1. A connection plate for a molded case circuit breaker, comprising a conduction section (1), characterized in that, Both ends of the conduction section (1) are fixedly connected with an installation section (2) and a contact section (3) respectively. A fixing frame (4) is sleeved and fixedly connected outside the conduction section (1). A pressing component is fixedly connected to the bottom of the inner wall of the fixing frame (4), and a pressing-down component is fixedly connected to the upper end of the fixing frame (4). A connecting rod (10) is slidably connected through the conduction section (1). One end of the connecting rod (10) is fixedly connected with a first pressing plate (9), and the other end is fixedly connected with a second pressing plate (11). A jacking rod (12) is fixedly connected to the upper end of the second pressing plate (11). The pressing-up component and the pressing-down component are respectively in pressing cooperation with the first pressing plate (9) and the second pressing plate (11). A bottom plate (6) is fixedly connected to the lower end of the conduction section (1). One end of the bottom plate (6) is fixedly connected with a driving plate (8) and a driven plate (7), and both the driving plate (8) and the driven plate (7) are in pressing cooperation with the pressing-up component.

2. The link plate of a molded case circuit breaker according to claim 1, characterized in that, The end of the pressing-up component is in pressing cooperation with the first pressing plate (9), and the middle of the pressing-up component is in pressing cooperation with the driving plate (8) and the driven plate (7). The expansion coefficients of the driving plate (8) and the driven plate (7) are different. The width of the installation section (2) is greater than the width of the conduction section (1), and the width of the contact section (3) is less than the width of the conduction section (1).

3. The link plate of a molded case circuit breaker according to claim 2, characterized in that, The pressing-up component includes a first connecting shaft (14). The first connecting shaft (14) is fixedly connected inside the fixing frame (4) and is located below the conduction section (1). An upper pressing plate (15) is rotatably connected to the first connecting shaft (14). The shape of the upper pressing plate (15) is set as an "S" shape. A first torsion spring (16) is sleeved on the first connecting shaft (14). One end of the first torsion spring (16) is in abutting cooperation with the inner wall of the fixing frame (4), and the other end is fixedly connected with the upper pressing plate (15). The end of the upper pressing plate (15) is in pressing cooperation with the first pressing plate (9), and the middle of the upper pressing plate (15) is in pressing cooperation with the driving plate (8) and the driven plate (7).

4. The link plate of a molded case circuit breaker according to claim 2, characterized in that The pressing-down component includes a shaft seat (17). The shaft seat (17) is fixedly connected to the upper end of the fixing frame (4). A second connecting shaft (18) is fixedly connected inside the shaft seat (17). A connecting plate (20) is rotatably connected to the second connecting shaft (18). A second torsion spring (19) is sleeved on the side wall of the second connecting shaft (18). One end of the second torsion spring (19) is in abutting cooperation with the inner wall of the shaft seat (17), and the other end is fixedly connected with the connecting plate (20). A lower pressing plate (21) is fixedly connected to the end of the connecting plate (20), and the lower pressing plate (21) is in pressing cooperation with the second pressing plate (11).

5. The link plate of a molded case circuit breaker according to claim 1, characterized in that, The fixing frame (4) is made of insulating material. An insulating layer (13) is coated on the side wall of the connecting rod (10), and the insulating layer (13) is used to prevent conduction between the connecting rod (10) and the conduction section (1).

6. The tie plate of a molded case circuit breaker according to claim 1, wherein, Two groups of mounting ears (5) are symmetrically and fixedly connected to the side wall of the fixing frame (4), and both groups of mounting ears (5) are located at one end of the fixing frame (4) close to the contact section (3).

Images