Device for displaying fault type of molded case circuit breaker and circuit breaker

Abstract

The utility model discloses a device for displaying fault types of a molded case circuit breaker and the circuit breaker, the device comprises a draw bar, a first lock catch, a first torsion spring, a second lock catch, a second torsion spring, a small cover and a draw bar torsion spring, the small cover is provided with a display window, and the draw bar is radially provided with a fault display device arm. A fault display device is arranged at the top end of the fault display device arm, a first hasp and a second hasp are outwards arranged at the positions, corresponding to the first lock catch and the second lock catch, of the traction rod in the radial direction, and the two hasps and the two lock catches are interlocked when no fault exists. When a fault occurs, the interlocking relation is gradually unlocked, the traction rod rotates around the shaft by different rotation angles, and therefore the fault display device is driven to display different marks on the display window, the problem that in the prior art, a fault type display device is complex is solved, and the beneficial effects that the structure is simplified, and reliability and universality are enhanced are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of low-voltage electrical components, and particularly to a device for a molded case circuit breaker to display fault types and a circuit breaker. Background Art

[0002] A molded case circuit breaker is a protection switch. As a protection electrical appliance, when a fault current appears in the circuit, the circuit breaker will perform corresponding protection according to the settings, cut off the circuit, and protect the safety of other electrical equipment and personnel. In a molded case circuit breaker, a thermal-magnetic release is a device that triggers corresponding protection according to the abnormal current in the circuit, releases the latch, and drives the operating mechanism to actuate to cut off the circuit. Most of the molded case circuit breakers on the market currently adopt thermal-magnetic two-stage protection. According to the current situation in the main circuit, when operating normally, it carries the main circuit current and does not trigger thermal-magnetic protection; when the main circuit current is overloaded, after a period of time according to the magnitude of the overloaded current, thermal protection is triggered, causing the circuit breaker to trip and cut off the overloaded current in the main circuit; when a short-circuit current appears in the main circuit, magnetic protection is immediately triggered, causing the circuit breaker to trip and cut off the short-circuit current in the main circuit. Most of the molded case circuit breakers on the market currently can determine whether the molded case circuit breaker is normally switched on and off or tripped through the position of the mechanism handle, but cannot determine whether the trip is a thermal protection trip or a magnetic protection trip.

[0003] Moreover, the market demand for molded case circuit breakers is more diversified. Customers need to know whether an overloaded current or a short-circuit current appears in the main circuit. Based on this need, there are also corresponding solutions in the prior art. For example, two traction rods and two latches are set. Different traction rods are used to unlock different latches according to different fault types, and different traction rod actions indicate different fault types. Therefore, this type of solution has a relatively complex structure. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present application provides a device for a molded case circuit breaker to display fault types and a circuit breaker to solve the problem that the fault type display device in the above prior art is relatively complex.

[0005] To achieve the above objectives, the present application is implemented through the following technical solutions:

[0006] A device for displaying fault types in a molded case circuit breaker, including a traction rod and a release base, further including a first latch, a first torsion spring, a second latch, a second torsion spring, a small cover, and a traction rod torsion spring. The traction rod is directly or indirectly fixed to the release base through the traction rod torsion spring. A display window is provided on the small cover. A fault display device arm is radially provided on the traction rod. A fault display device is provided at the top of the fault display device arm. The fault display device is plate-shaped and close to the inner wall of the small cover. Different marks are provided on the outer surface of the fault display device according to fault types. The first latch rotates around a latch shaft parallel to the traction rod and has a latch feature in the traction rod direction. The second latch rotates around the same latch shaft and also has a latch feature in the traction rod direction. The first torsion spring and the second torsion spring are both sleeved on the latch shaft. One end of the first torsion spring is fixed to the release base and the other end is fixed to the first latch. One end of the second torsion spring is fixed to the lower side of the second latch and the other end is fixed to the first latch. First and second buckle arms extend radially outward from the positions of the first latch and the second latch on the traction rod. First and second buckles are respectively provided at the tops of the first and second buckle arms. When there is no fault, the first and second buckles are respectively interlocked with the first and second latches. When there is a fault, the interlock relationship is gradually unlocked, so that the traction rod rotates around the axis by different rotation angles, thereby driving the fault display device to display different marks on the display window.

[0007] Preferably, the outer surface of the fault display device is a curved surface with the fault display device arm as the radius.

[0008] Preferably, a number of display cells are provided on the outer surface of the fault display device according to fault types, and different colors are used in the display cells to represent different marks.

[0009] Preferably, the display cells are square.

[0010] Preferably, the display window is square.

[0011] Preferably, the number of display windows is two, and they are arranged along the axial direction of the traction rod. The display cells on the fault display device adopt a two-three array, with three columns arranged along the axial direction of the traction rod and two columns arranged perpendicular to the axial direction of the traction rod. The three columns are divided into three groups according to colors, and the two columns are respectively located under the display windows and are arranged corresponding to the two display windows.

[0012] Preferably, the latch shaft and the first latch are integrated.

[0013] Preferably, a traction rod shaft extending beyond the traction rod at both ends is further included inside the traction rod, and the traction rod is installed on the release base through the traction rod shaft.

[0014] Preferably, a longitudinal latch shaft pressing platform and a transverse latch supporting platform are provided outside the wall of the release base. The latch shaft is installed under the pressing platform of the latch shaft pressing platform, and the first latch is installed above the latch supporting platform.

[0015] Based on the same inventive concept, the present application also discloses a circuit breaker, including a panel, and further including the above device for indicating the fault type of a molded case circuit breaker, and the small cover is arranged on the panel.

[0016] Compared with the prior art, the beneficial effects of this solution are as follows: The device for indicating the fault type in this solution is connected to the traction rod and is linked with the first latch and the second latch on the release, and can accurately indicate the overload long-time delay protection tripping or the short-circuit instantaneous protection tripping. The structure is simple and compact, and the action is reliable. It can be slightly adjusted to adapt to different frame sizes of molded case circuit breakers. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural schematic diagram of an embodiment of the present application without a fault;

[0018] Figure 2 It is a display schematic diagram of the small cover on the panel of an embodiment of the present application without a fault;

[0019] Figure 3 It is a three-dimensional structural schematic diagram of an embodiment of the present application during overload tripping;

[0020] Figure 4 It is a display schematic diagram of the small cover on the panel of an embodiment of the present application during overload tripping;

[0021] Figure 5 It is a three-dimensional structural schematic diagram of an embodiment of the present application during short-circuit tripping;

[0022] Figure 6 It is a display schematic diagram of the small cover on the panel of an embodiment of the present application during short-circuit tripping;

[0023] Figure 7 It is a three-dimensional structural schematic diagram of another perspective of an embodiment of the present application with some components omitted;

[0024] Figure 8 It is a three-dimensional structural schematic diagram of the interlocking relationship between the latch and the buckle of an embodiment of the present application;

[0025] Figure 9 It is a three-dimensional structural schematic diagram of a certain perspective of an embodiment of the present application with the panel included;

[0026] Among them, 1 - the first latch, 11 - the latch shaft, 2 - the first torsion spring, 3 - the second latch, 31 - the shielding feature, 4 - the second torsion spring, 5 - the traction rod, 51 - the fault display device, 511 - the display grid, 52 - the first buckle, 53 - the second buckle, 6 - the panel, 61 - the small cover, 611 - the display window, 7 - the traction rod torsion spring, 8 - the release base, 81 - the latch shaft press table, 82 - the latch support table, 9 - the traction rod shaft. Specific implementation mode

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0028] This embodiment provides a technical solution: A device for displaying the fault type of a molded case circuit breaker disclosed in this solution includes a release base 8, a first latch 1, a first torsion spring 2, a second latch 3, a second torsion spring 4, a traction rod torsion spring 7, and a traction rod 5 with a fault category display. The first latch 1 is a component that unlocks the plastic latch unlocking mechanism on the unlocking push mechanism during a fault, so that the mechanism trips, and when the mechanism is re-locked during unlocking, the handle drives the first latch 1 to reset and is locked by the traction rod 5. The first torsion spring 1 is a component that provides power for driving the plastic latch on the unlocking mechanism of the first latch 1, with one end fixed to the first latch 1 and the other end fixed to the release base 8. The second latch 3 is a component that is unlocked during a short-circuit fault. The second torsion spring 4 is a component that provides rotational power for the second latch 3 when the second latch 3 is unlocked, with one end fixed to the first latch 1 and the other end fixed to the second latch 3. The traction rod 5 with a fault category display is a device that rotates to unlock the first latch 1 during an overload fault, rotates to unlock the first latch 1 and the second latch 3 during an instantaneous fault, has a fault display mark, and can rotate at different angles according to different fault categories, and the fault categories displayed on the small cover 61 are also different. A display window 611 is opened on the small cover 61. A fault display device arm is radially arranged on the traction rod 5. A fault display device 51 is arranged at the top of the fault display device arm. The fault display device 51 is plate-shaped and is close to the inner wall of the small cover 61. Different marks are arranged on the outer surface of the fault display device 51 according to the fault type.

[0029] The first latch 1 rotates around a latch axis parallel to the traction rod 5 and has a latch feature in the direction of the traction rod 5. The second latch 3 rotates around the same latch axis and also has a latch feature in the direction of the traction rod 5. The first torsion spring 2 and the second torsion spring 4 are both sleeved on the latch axis. One end of the first torsion spring 2 is fixed on the release base 8 and the other end is fixed on the first latch 1. One end of the second torsion spring 4 is fixed on the lower side of the second latch 3 and the other end is fixed on the first latch 1. At positions corresponding to the first latch 1 and the second latch 3 on the traction rod 5, a first latching arm and a second latching arm extend radially outwards. At the tops of the first latching arm and the second latching arm, a first latch 52 and a second latch 53 are respectively provided. When there is no fault, the first latch 52 and the second latch 53 are respectively interlocked with the first latch 1 and the second latch 3. When there is a fault, the interlocking relationship is gradually unlocked so that the traction rod 5 rotates around the axis by different rotation angles, thereby driving the fault display device 51 to display different marks on the display window 611. In this embodiment, the first torsion spring 2 is sleeved on the latch axis 11, the second torsion spring 4 is sleeved outside the first torsion spring 2. The latching openings of the first latch 52 and the second latch 53 are at the same horizontal position. The latch feature of the first latch 1 is slightly lower than the latch feature of the second latch 3, and a shielding feature 31 extends from the side of the latch feature of the second latch 3 to block in front of the latch feature of the first latch 1, so as to achieve the effect that when there is a fault, the interlocking relationship is gradually unlocked so that the traction rod 5 rotates around the axis by different rotation angles.

[0030] In this embodiment, the outer surface of the fault display device 51 is a curved surface with the fault display device arm as the radius, or it can also be a plane, but the display effect is inferior to that of the curved surface. The outer surface of the fault display device 51 is provided with a plurality of display cells 511 according to the fault type. Different colors are used for the display cells to represent different marks. In this embodiment, two colors, green and red, are used to represent different marks. And in this embodiment, the display cells 511 are square, and the display window 611 is also square. The two matching corresponding structures here can also be other shapes such as circular, or two different shapes, as long as the display cell 511 is smaller than the display window 611.

[0031] In this embodiment, the number of the display windows 611 is two and they are arranged along the axial direction of the traction rod 5. The display cells 511 on the fault display device 51 adopt a two-three array, with three columns arranged along the axial direction of the traction rod 5 and two columns arranged perpendicular to the axial direction of the traction rod 5. The three columns are divided into three groups according to colors. The two columns are respectively located below the display windows 611 and are arranged corresponding to the two display windows 611. In this embodiment, the basic color is green, the upper row of the middle display cell 511 is red, and the lower row of the right display cell 511 is red. In the drawings, the red is shown as grayish black. When three colors are used, the number of the display windows 611 can be reduced to one, and the display cells 511 on the fault display device 51 can adopt one column, and all can be set according to requirements.

[0032] In this embodiment, the latch shaft 11 and the first latch 1 are integrated. A shaft hole is provided on the second latch 3 and sleeved on the latch shaft 11 of the first latch 1. Of course, it can also be arranged in the reverse way, that is, the latch shaft and the second latch 3 are integrated, a shaft hole is provided on the first latch 1 and then sleeved on the latch shaft of the second latch 3, or other forms such as a separate latch shaft are adopted. For the installation positions of the latch shaft and the two latches, they can be at any appropriate positions. In this embodiment, two longitudinal latch shaft pressing platforms 81 and one transverse latch supporting platform 82 are provided outside the wall of the release base 8. The latch shaft 11 is installed under the arc feature of the latch shaft pressing platform 81, and the first latch 1 is installed above the latch supporting platform 82 and supported by the latch supporting platform 82.

[0033] Regarding the fixation of the traction rod 5, in this embodiment, the inner side of the traction rod 5 further includes a traction rod shaft 9 with both ends extending out of the traction rod 5. The traction rod 5 is installed in two traction rod shaft holes of the release base 8 through the traction rod shaft 9. The traction rod 5 is fixed on the release base 8 through a traction rod torsion spring 7. One end of the traction rod torsion spring 7 is fixed on the traction rod 5, and the other end is fixed on the release base 8. The traction rod torsion spring 7 can make the traction rod 5 reset after rotation. Other methods can also be used to fix the traction rod 5.

[0034] When the overload long-time protection trips, the traction rod 5 with fault category display unlocks the first latch 1. The first latch 1 strikes the latch on the operating mechanism under the action of the first torsion spring 2, so that the operating mechanism unlocks and the circuit breaker trips. The first latch 1 is in the tripped position and holds the traction rod 5 with fault category display in the overload protection tripped position. As Figure 4 shown, it can be seen from the fault display window 611 outside the circuit breaker that the display on the left changes from green to red. When the operating mechanism is re-locked, the handle drives the first latch 1 to reset. At the same time, the traction rod 5 with fault category display loses the restriction of the first latch 1 and resets under the action of the traction rod torsion spring 7, indicating the reset.

[0035] When the short-circuit instantaneous protection trips, the traction rod 5 with fault category display unlocks the first latch 1 and the second latch 3. The first latch 1 strikes the latch on the operating mechanism under the action of the first torsion spring 2, so that the operating mechanism unlocks and the circuit breaker trips. The second latch 3 twists to the limit point of the first latch 1 under the action of the second torsion spring 4. The second latch 3 is higher than the first latch 1 and holds the traction rod 5 with fault category display in a farther short-circuit protection tripped position. At this time, the rotation angle of the traction rod 5 is larger. As Figure 6As shown, it can be seen from the fault display window 611 outside the circuit breaker that the display on the right changes from green to red. When the operating mechanism is re-locked, the handle drives the first latch 1, and the first latch 1 drives the second latch 3 to reset. At the same time, the traction rod 5 with fault category display loses the restrictions of the first latch 1 and the second latch 3, and under the action of the traction rod torsion spring 7, the traction rod 5 resets, indicating reset.

[0036] Based on the same inventive concept, the present application also discloses an embodiment of a circuit breaker, including a panel 6 and the aforementioned device for displaying the fault type of a molded case circuit breaker, and the small cover 61 is provided on the panel 6.

[0037] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application. In addition, when terms such as "first" and "second" appear, they are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0038] The above is only a preferred specific embodiment of the present solution, but the scope of protection required by the present solution is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present application, makes equivalent substitutions or changes, and should be covered by the protection scope of the present application.

Claims

1. A device for a molded case circuit breaker to display a fault type, including a traction rod (5) and a release base (8), characterized in that: It further includes a first latch (1), a first torsion spring (2), a second latch (3), a second torsion spring (4), a small cover (61), and a drawbar torsion spring (7). The drawbar (5) is directly or indirectly fixed to the release base (8) through the drawbar torsion spring (7). A display window (611) is provided on the small cover (61). A fault display device arm is radially provided on the drawbar (5), and a fault display device (51) is provided at the top of the fault display device arm. The fault display device (51) is plate-shaped and is close to the inner wall of the small cover (61). Different marks are provided on the outer surface of the fault display device (51) according to the fault type. The first latch (1) rotates around a latch axis parallel to the drawbar (5) and has a latch feature in the direction of the drawbar (5). The second latch (3) rotates around the same latch axis and also has a latch feature in the direction of the drawbar (5). The first torsion spring (2) and the second torsion spring (4) are both sleeved on the latch axis. One end of the first torsion spring (2) is fixed to the release base (8), and the other end is fixed to the first latch (1). One end of the second torsion spring (4) is fixed to the lower side of the second latch (3), and the other end is fixed to the first latch (1). First and second buckle arms extend radially outward from the drawbar (5) at positions corresponding to the first latch (1) and the second latch (3). First and second buckles (52) and (53) are respectively provided at the tops of the first and second buckle arms. When there is no fault, the first buckle (52) and the second buckle (53) are respectively interlocked with the first latch (1) and the second latch (3). When there is a fault, the interlock relationship is gradually unlocked, so that the drawbar (5) rotates around the axis by different rotation angles, thereby driving the fault display device (51) to display different marks on the display window (611).

2. The device for displaying fault types in a molded case circuit breaker according to claim 1, characterized in that: The outer surface of the fault display device (51) is a curved surface with the fault display device arm as the radius.

3. The device for displaying fault types in a molded case circuit breaker according to claim 2, wherein: A number of display cells (511) are provided on the outer surface of the fault display device (51) according to the fault type, and different colors of the display cells are used to represent different marks.

4. The device for displaying the fault type of a molded case circuit breaker according to claim 3, characterized in that: The display cell (511) is square.

5. The device for displaying fault types in a molded case circuit breaker according to claim 4, characterized in that: The display window (611) is square.

6. The device for displaying the fault type of a molded case circuit breaker according to claim 1, characterized in that: The number of the display windows (611) is two, and they are arranged along the axial direction of the drawbar (5). The display cells (511) on the fault display device (51) adopt a two-three array, with three columns arranged along the axial direction of the drawbar (5) and two columns arranged perpendicular to the axial direction of the drawbar (5). The three columns are divided into three groups according to colors, and the two columns are respectively located below the display windows (611) and are arranged corresponding to the two display windows (611).

7. The device for displaying the fault type of a molded case circuit breaker according to claim 1, characterized in that: The latch axis and the first latch (1) are integrated.

8. The device for displaying the fault type of a molded case circuit breaker according to claim 7, characterized in that: The inner side of the drawbar (5) further includes a drawbar shaft (9) with both ends extending out of the drawbar (5). The drawbar (5) is installed on the release base (8) through the drawbar shaft (9).

9. The device for displaying the fault type of a molded case circuit breaker according to claim 1, characterized in that: Outside the wall of the release base (8), there are a longitudinal latch shaft pressing platform (81) and a transverse latch supporting platform (82). The latch shaft (11) is installed under the pressing platform of the latch shaft pressing platform (81), and the first latch (1) is installed above the latch supporting platform (82).

10. A circuit breaker, comprising a panel (6), characterized in that: It further includes the device for displaying fault types of a molded case circuit breaker according to any one of claims 1-9, and the small cover (61) is arranged on the panel (6).

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