An under-voltage release with alarm signal output function

Abstract

The application relates to an under-voltage release with an alarm signal output function, which comprises an accessory shell with an inner cavity; a fixed under-voltage coil and a micro switch are arranged in the accessory shell; a rotatable under-voltage release push rod and a transmission support, and spring A and spring B for resetting the under-voltage release push rod and the transmission support are arranged in the accessory shell; a micro switch button is arranged on the micro switch; one end of the under-voltage release push rod is a transmission end which is in transmission connection with a movable end of the under-voltage coil through the transmission support, and the other end is a push rod body which extends out of the accessory shell, and a boss for pressing the micro switch button is arranged on the under-voltage release push rod. Compared with the prior art, the application has the advantages of simple structure, reliable action, unchanged volume, plug-in installation, and the like, and a set of switches with an alarm function is added on the basis of a conventional under-voltage release, so that the function of releasing the circuit breaker and alarming is provided in the under-voltage of the molded case circuit breaker.

Description

Technical Field

[0001] This invention relates to accessory devices for molded case circuit breakers, and more particularly to an undervoltage release device with an alarm signal output function. Background Technology

[0002] An undervoltage relay or trip unit is a relay that causes a mechanical switching device to open or close with or without a delay when the terminal voltage of the relay or trip unit drops to a predetermined value. Typically, undervoltage relays or trip units are combined with switching devices. When the applied voltage drops, even slowly, to within 35% to 70% of the rated voltage, the undervoltage relay and trip unit combined with the switching device should operate to disconnect the device.

[0003] Currently, there are no 250A frame products on the market that integrate undervoltage trip and alarm switch. Consequently, there is no integrated accessory device to provide undervoltage trip and alarm functions. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide an undervoltage release device with an alarm signal output function. It features a simple structure, reliable operation, unchanged size, and plug-in installation. Based on a conventional undervoltage release device, it adds a set of alarm-enabled switches, providing the function of tripping the circuit breaker and triggering an alarm in the event of undervoltage in a molded case circuit breaker.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] The first aspect of the present invention provides an undervoltage release device with an alarm signal output function, comprising: an accessory housing having an inner cavity; the accessory housing is provided with a fixed undervoltage coil and a micro switch, a rotatable undervoltage release push rod and a transmission bracket, and springs A and B for resetting the undervoltage release push rod and the transmission bracket, respectively.

[0007] The micro switch is equipped with a micro switch button;

[0008] One end of the undervoltage release push rod is a transmission end, which is connected to the movable end of the undervoltage coil through a transmission bracket. The other end is the push rod body, which extends out of the accessory housing. The undervoltage release push rod is provided with a boss for pressing the micro switch button.

[0009] Preferably, when the power supply voltage is greater than or equal to 85% and the circuit breaker can be closed, the undervoltage coil generates electromagnetic force, which drives the transmission bracket to rotate through the movable end. The transmission bracket acts on the transmission end of the undervoltage trip push rod and drives the undervoltage trip push rod to rotate, so that the boss presses on the micro switch button. The state of the undervoltage trip push rod in this state is recorded as position A.

[0010] When the power supply voltage drops to 70%-35% of the rated value, due to insufficient voltage, the electromagnetic force of the undervoltage coil is insufficient to keep the undervoltage trip push rod in position A. Under the action of spring A and spring B, the undervoltage trip push rod and the transmission bracket rotate in opposite directions, causing the boss to release the micro switch button. The state of the undervoltage trip push rod in this state is recorded as position B.

[0011] Preferably, the micro switch is located on one side of the rotating plane of the undervoltage release push rod, and the micro switch button is located on the moving trajectory of the boss on the undervoltage release push rod. The boss presses the micro switch button by squeezing it during the rotation of the undervoltage release push rod.

[0012] Preferably, the boss is located on the side of the undervoltage release push rod facing the micro switch button, and the boss is an inclined boss.

[0013] Preferably, the movable end of the undervoltage coil is connected to the transmission bracket, and the transmission bracket and the reset undervoltage trip push rod are rotatably connected to the accessory housing through the transmission shaft and the push rod shaft, respectively.

[0014] Preferably, a fixed bracket is provided on the inner side wall of the accessory housing, and the transmission bracket and the reset undervoltage release push rod are rotatably connected to the fixed bracket through the transmission shaft and the push rod shaft, respectively.

[0015] Preferably, the transmission bracket has two opposing bracket bodies and a drive shaft for acting on the transmission end of the undervoltage release push rod. The drive shaft passes through the bracket body, and the transmission shaft passes through the two bracket bodies and is rotatably connected to the fixed bracket.

[0016] Preferably, the undervoltage release push rod has a step that forms a groove that matches the drive shaft for interaction between the drive shaft and the undervoltage release push rod.

[0017] A second aspect of the present invention provides a molded case circuit breaker, including a large cover and a middle cover fastened to the large cover, wherein the large cover has an accessory cavity and further includes the undervoltage release device disposed in the accessory cavity.

[0018] Preferably, the width of the undervoltage release is the same as that of the single-function undervoltage release, and it is installed in the accessory cavity by plugging in.

[0019] This invention, through this accessory device, when the rated voltage of the circuit breaker is between 35% and 70%, switches the undervoltage trip push rod from position B to position A, causing the microswitch button to switch from closed to open. Ultimately, this causes the undervoltage trip push rod to push the trip shaft of the circuit breaker mechanism, thereby tripping the circuit breaker and disconnecting the main circuit. This achieves the function of providing circuit breaker tripping and alarm functionality within the circuit breaker.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] (1) Provide an accessory device that integrates undervoltage release and alarm switch for molded case circuit breakers, so that the circuit breaker can be controlled to trip and alarm by rated voltage.

[0022] (2) It has a simple structure, reliable operation, unchanged size, and plug-in installation. It adds a set of alarm function switches on the basis of conventional undervoltage trip unit, providing the function of tripping the circuit breaker and alarming in the undervoltage of molded case circuit breaker. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the main cross-sectional structure of an undervoltage release device with alarm signal output function according to the present invention.

[0024] Figure 2 This is a schematic diagram of the undervoltage release device of the present invention.

[0025] Figure 3 This is a schematic diagram showing the undervoltage release push rod of the undervoltage release device of the present invention switching between positions A and B.

[0026] Figure 4 This is a front view schematic diagram of the undervoltage release push rod of the undervoltage release device of the present invention switching between positions A and B.

[0027] Figure 5 This is a schematic diagram showing the interaction between the boss of the undervoltage release device and the micro switch button of the present invention.

[0028] Figure 6 This is a schematic diagram of the undervoltage release push rod of the undervoltage release device of the present invention.

[0029] Figure 7 This is a schematic diagram of the external structure of the undervoltage release device of the present invention.

[0030] Figure 8 This is a schematic diagram of the undervoltage release device of the present invention installed on the cover.

[0031] Figure 9 This is one of the schematic diagrams illustrating the working principle of the circuit breaker of the present invention.

[0032] Figure 10 This is the second schematic diagram illustrating the working principle of the circuit breaker of the present invention.

[0033] In the diagram, 1 is the undervoltage release push rod, 101 is the transmission end, 102 is the push rod body, 1011 is the step, 2 is the micro switch, 3 is the transmission shaft, 4 is spring A, 5 is the fixed bracket, 6 is the transmission bracket, 601 is the bracket body, 602 is the drive shaft, 7 is the push rod shaft, 8 is spring B, 9 is the accessory housing, 10 is the undervoltage coil, 11 is the stationary contact, 12 is the moving contact, 13 is the elastic clip, 14 is the traction rod, 15 is the backup protection armature, 16 is the boss, 17 is the micro switch button, 18 is the large cover, 19 is the middle cover, 20 is the product nameplate, and I is the undervoltage release device. Detailed Implementation

[0034] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0035] In the description of this invention, unless otherwise stated, the terms "upper," "lower," "left," "right," "inner," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "A," "B," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] Example 1

[0037] An undervoltage release device with alarm signal output function, such as Figures 1-7 As shown, it includes an accessory housing 9 with an inner cavity; the accessory housing 9 is provided with a fixed undervoltage coil 10 and a micro switch 2, a rotatable undervoltage trip push rod 1 and a transmission bracket 6, and springs A4 and B8 for resetting the undervoltage trip push rod 1 and the transmission bracket 6, respectively.

[0038] The micro switch 2 is equipped with a micro switch button 17; one end of the undervoltage release push rod 1 is a transmission end 101, which is connected to the movable end of the undervoltage coil 10 through the transmission bracket 6, and the other end is the push rod body 102, which extends out of the accessory housing 9, and the undervoltage release push rod 1 is equipped with a boss 16 for pressing the micro switch button 17.

[0039] More specifically, in this invention:

[0040] When the power supply voltage is greater than or equal to 85%, and the circuit breaker can close (the contact points of the moving contact 12 and the stationary contact 11 are in contact), the undervoltage coil 10 generates electromagnetic force, which drives the transmission bracket 6 to rotate through the movable end. The transmission bracket 6 acts on the transmission end of the undervoltage trip push rod 1 and drives the undervoltage trip push rod 1 to rotate, so that the boss 16 presses on the micro switch button 17. The state of the undervoltage trip push rod 1 in this state is recorded as position A (push rod closed position).

[0041] When the power supply voltage drops to 70%-35% of the rated value, due to insufficient voltage, the electromagnetic force of the undervoltage coil 10 is insufficient to keep the undervoltage trip push rod 1 in position A. Under the action of springs A4 and B8, the undervoltage trip push rod 1 and the transmission bracket 6 rotate in opposite directions, causing the boss 16 to release the micro switch button 17, activating the alarm switch and outputting an alarm signal. At this time, in the molded case circuit breaker, the undervoltage trip push rod 1 strikes the backup protection armature 15, which then activates and strikes the traction rod 14, achieving the circuit breaker tripping effect. Under normal circumstances, a suitable reaction spring controls this to prevent it from contacting the traction rod 14, thus preventing tripping. The state of the undervoltage trip push rod 1 in this state is recorded as position B (push rod release position).

[0042] When the power supply voltage is below 35%, the circuit breaker cannot be closed because the undervoltage trip push rod 1 will keep pressing against the backup protection armature 15, so the backup protection armature 15 will keep in contact with the traction rod 14 and cannot complete the closing.

[0043] If the circuit breaker needs to be tripped and closed again, the power supply must be restored.

[0044] The undervoltage coil 10 in this invention preferably has an outer coil and an inner coil that can move along the axial direction of the outer coil. The inner coil is the movable end of the undervoltage coil 10, such as... Figure 1 As shown.

[0045] In this invention, the micro switch 2 is preferably disposed on one side of the rotating plane of the undervoltage trip push rod 1, and the micro switch button 17 is disposed on the moving trajectory of the protrusion 16 on the undervoltage trip push rod 1. During the rotation of the undervoltage trip push rod 1, the protrusion 16 presses the micro switch button 17, as shown below. Figure 5 and Figure 6 As shown. More preferably, the boss 16 is disposed on the side of the undervoltage trip push rod 1 facing the micro switch button 17, and the boss 16 is a sloping boss, so that when the circuit breaker is closed, the push rod can press the micro switch button 17 relatively smoothly.

[0046] In this invention, for Figure 1In terms of their positional relationship, the push rod body 102 extends out of the accessory housing 9 from below. The micro switch 2 and the undervoltage coil 10 are arranged in the accessory housing 9, one below and one above. The movable end of the undervoltage coil 10 faces to the left. The undervoltage trip push rod 1 and the transmission bracket 6 are located to the left of the movable end of the undervoltage coil. This layout is more compact and the movement relationship between the transmission components is more reasonable and reliable.

[0047] In this invention, it is further preferred that the movable end of the undervoltage coil 10 is connected to the transmission bracket 6, and the transmission bracket 6 and the reset undervoltage trip push rod 1 are rotatably connected to the accessory housing 9 via the transmission shaft 7 and the push rod shaft 3, respectively. More preferably, a fixed bracket 5 is provided on the inner wall of the accessory housing 9, and the transmission bracket 6 and the reset undervoltage trip push rod 1 are rotatably connected to the fixed bracket 5 via the transmission shaft 7 and the push rod shaft 3, respectively. Furthermore, the transmission bracket 6 has two opposing bracket bodies 601 and a drive shaft 602 for acting on the transmission end 101 of the undervoltage trip push rod 1. The drive shaft 602 passes through the bracket bodies 601, and the transmission shaft 7 passes through the two bracket bodies 601 and is rotatably connected to the fixed bracket 5. See also Figures 1-7 In this invention, the undervoltage release push rod 1 preferably has a step 1011, which forms a groove that matches the drive shaft 602, for the interaction between the drive shaft 602 and the undervoltage release push rod 1. See [reference needed]. Figure 6 .

[0048] Furthermore, the undervoltage release device in this invention is also provided with a flexible clip 13 for fixing on its outer side, which can be directly installed onto the molded case circuit breaker during use. More preferably, the flexible clip 13 is provided with an identifier for identifying the type of undervoltage release device. Since the undervoltage release device adopts a universal (modular) design, its exposed side is basically similar after being inserted into the molded case circuit breaker. The identifier allows for intuitive and quick identification of the undervoltage release device type during actual use.

[0049] The main function of the undervoltage release device in this embodiment is to provide an integrated undervoltage release device for molded case circuit breakers, combining undervoltage tripping and alarm functions. When the rated voltage is 85% to 110%, the undervoltage coil 10 inside the undervoltage release device continuously receives an electrical signal, the undervoltage push rod receives a closing electrical signal, and the microswitch button 17 is pressed. The alarm release contacts B11 and B12 close, allowing the circuit breaker to open and close normally. When the rated voltage is 35% to 70%, the undervoltage coil inside the undervoltage release device loses its electrical signal, the undervoltage release push rod 1 resets, and the alarm contact state changes from B11 and B12 closed to B11 and B14 closed, allowing the circuit breaker to trip freely and trigger an alarm. After the circuit breaker trips again, the alarm contacts return to their original state. When the rated voltage is below 35%, the undervoltage release device prevents the circuit breaker from closing. Through the action of the undervoltage release device, the circuit breaker trips and triggers an alarm when undervoltage occurs.

[0050] Example 2

[0051] A molded case circuit breaker includes a large cover 18 and a middle cover 19 fastened to the large cover 18. The large cover 18 has an accessory cavity, and the circuit breaker also includes an undervoltage release device I from Embodiment 1 disposed within the accessory cavity. More preferably, a product nameplate 20 is also installed in the accessory cavity to cover the undervoltage release device I from Embodiment 1. In this invention, the product nameplate 20 may further have an observation hole for observing the identification. Preferably, the width of the undervoltage release device I is the same as that of a single-function undervoltage release device, and it is installed in the accessory cavity by plugging it in. The operating principle of this molded case circuit breaker is described in the relevant section of Embodiment 1.

[0052] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. An undervoltage release device with alarm signal output function, characterized in that, include: The accessory housing (9) has an inner cavity; the accessory housing (9) is provided with a fixed undervoltage coil (10) and a micro switch (2), a rotatable undervoltage trip push rod (1) and a transmission bracket (6), and springs A (4) and B (8) for resetting the undervoltage trip push rod (1) and the transmission bracket (6), respectively. The micro switch (2) is equipped with a micro switch button (17); One end of the undervoltage release push rod (1) is a transmission end (101), which is connected to the movable end of the undervoltage coil (10) through the transmission bracket (6), and the other end is the push rod body (102), which extends out of the accessory housing (9). The undervoltage release push rod (1) is provided with a boss (16) for pressing the micro switch button (17). When the power supply voltage is greater than or equal to 85% and the circuit breaker can be closed, the undervoltage coil (10) generates electromagnetic force, which drives the transmission bracket (6) to rotate through the movable end. The transmission bracket (6) acts on the transmission end of the undervoltage trip push rod (1) and drives the undervoltage trip push rod (1) to rotate, so that the boss (16) presses on the micro switch button (17). The state of the undervoltage trip push rod (1) in this state is recorded as position A. When the power supply voltage drops to 70%-35% of the rated value, due to insufficient voltage, the electromagnetic force of the undervoltage coil (10) is insufficient to keep the undervoltage trip push rod (1) in position A. Under the action of spring A (4) and spring B (8), the undervoltage trip push rod (1) and the transmission bracket (6) rotate in opposite directions, so that the boss (16) releases the micro switch button (17). The state of the undervoltage trip push rod (1) in this state is recorded as position B.

2. The undervoltage release device with alarm signal output function according to claim 1, characterized in that, The micro switch (2) is located on one side of the rotating plane of the undervoltage release push rod (1), and the micro switch button (17) is located on the moving trajectory of the boss (16) on the undervoltage release push rod (1). The boss (16) presses the micro switch button (17) by squeezing the micro switch button (17) during the rotation of the undervoltage release push rod (1).

3. An undervoltage release device with alarm signal output function according to claim 2, characterized in that, The boss (16) is located on the side of the undervoltage release push rod (1) facing the micro switch button (17), and the boss (16) is a sloping boss.

4. An undervoltage release device with alarm signal output function according to claim 1, characterized in that, The movable end of the undervoltage coil (10) is connected to the transmission bracket (6). The transmission bracket (6) and the reset undervoltage trip push rod (1) are rotatably connected to the accessory housing (9) through the transmission shaft (3) and the push rod shaft (7), respectively.

5. An undervoltage release device with alarm signal output function according to claim 4, characterized in that, The inner wall of the accessory housing (9) is provided with a fixed bracket (5). The transmission bracket (6) and the reset undervoltage release push rod (1) are rotatably connected to the fixed bracket (5) through the transmission shaft (3) and the push rod shaft (7), respectively.

6. An undervoltage release device with alarm signal output function according to claim 5, characterized in that, The transmission bracket (6) has two opposing bracket bodies (601) and a drive shaft (602) for acting on the transmission end (101) of the undervoltage release push rod (1). The drive shaft (602) passes through the bracket body (601), and the transmission shaft (3) passes through the two bracket bodies (601) and is rotatably connected to the fixed bracket (5).

7. An undervoltage release device with alarm signal output function according to claim 6, characterized in that, The undervoltage release push rod (1) is provided with a step (1011), which forms a groove that matches the drive shaft (602) for interaction between the drive shaft (602) and the undervoltage release push rod (1).

8. A molded case circuit breaker, comprising a large cover (18) and a middle cover (19) fastened to the large cover (18), wherein the large cover (18) is provided with an accessory cavity, characterized in that, It also includes an undervoltage release device as described in any one of claims 1 to 7, disposed within the accessory cavity.

9. A molded case circuit breaker according to claim 8, characterized in that, The width of the undervoltage release is the same as that of the single-function undervoltage release, and it is installed in the accessory cavity by plugging in.

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