A mounting device common to a divided excitation release and an under voltage release

Abstract

The application relates to a mounting device for a shunt release and an under-voltage release, which comprises a base and an upper cover, the base and the upper cover are buckled to each other to form a release mounting seat, the release mounting seat is internally provided with a cavity for mounting the shunt release and the under-voltage release, and the base is mounted on a middle sleeve. Compared with the prior art, the shunt release and the under-voltage release are designed in a universal shell, parts are saved, cost is reduced, the structure of the shunt release and the under-voltage release is simplified, the shunt release and the under-voltage release are more reliable during the operation process, the shunt release and the under-voltage release can be mounted on the left side or the right side of a circuit breaker according to different requirements, the shunt release and the under-voltage release can be interchanged, the universality is high, and the selection space of users is increased.

Description

Technical Field

[0001] This invention relates to the field of circuit breaker technology, and in particular to a universal mounting device for shunt trip units and undervoltage trip units. Background Technology

[0002] A circuit breaker is a switching device capable of closing, carrying, and interrupting current under normal circuit conditions, and capable of closing, carrying, and interrupting current under abnormal circuit conditions within a specified time. Circuit breakers are classified into high-voltage circuit breakers and low-voltage circuit breakers according to their application.

[0003] Low-voltage circuit breakers, also known as automatic air switches, have multiple protection functions (overload, short circuit, undervoltage protection, etc.), adjustable operating values, high breaking capacity, convenient operation, and safety, making them widely used. Structure and Working Principle: Low-voltage circuit breakers consist of an operating mechanism, contacts, protection devices (various trip units), and an arc-extinguishing system.

[0004] The main contacts of a low-voltage circuit breaker are closed manually or electrically. After the main contacts are closed, the free-trip mechanism locks them in the closed position. The coil of the overcurrent trip unit and the thermal element of the thermal trip unit are connected in series with the main circuit, while the coil of the undervoltage trip unit is connected in parallel with the power supply. When a short circuit or severe overload occurs, the armature of the overcurrent trip unit is attracted, causing the free-trip mechanism to operate and the main contacts to disconnect the main circuit. When the circuit is overloaded, the thermal element of the thermal trip unit heats up, causing the bimetallic strip to bend and pushing the free-trip mechanism to operate. When the circuit is undervoltage, the armature of the undervoltage trip unit is released, also causing the free-trip mechanism to operate. The shunt trip unit is used for remote control. During normal operation, its coil is de-energized. When remote control is required, pressing the start button energizes the coil.

[0005] Shunt trip units and undervoltage trip units are important internal accessories of circuit breakers. Currently, shunt trip units and undervoltage trip units are generally designed separately and installed on both sides of the intermediate sleeve. This lack of versatility wastes parts, increases costs, and limits the options available to users for accessories. Summary of the Invention

[0006] The purpose of this invention is to overcome the defects of the prior art and provide a simple and easy-to-use installation device for both shunt trip and undervoltage trip devices.

[0007] The objective of this invention can be achieved through the following technical solution: a universal mounting device for shunt trip and undervoltage trip, comprising a base and a top cover, wherein the base and the top cover are interlocked to form a trip unit mounting seat, wherein the trip unit mounting seat has a cavity for mounting the shunt trip and the undervoltage trip, and the base is mounted on the middle sleeve.

[0008] Both the shunt trip unit and the undervoltage trip unit are equipped with a magnetic yoke, an outer frame, a coil, a moving iron core, a stationary iron core, a spring, and a push rod. The outer frame is housed within the magnetic yoke, the coil is wound around the outer frame, the stationary iron core is located within the outer frame, and the spring is positioned between the moving and stationary iron cores. One end of the moving iron core is placed inside the outer frame, and the other end passes through the outer frame and connects to the push rod. The shunt trip unit and the undervoltage trip unit also differ structurally, such as in the push rod structure.

[0009] The shunt trip and undervoltage trip units with the same structure can both be fixed in the above-mentioned cavity. The different parts, such as the push rod, are moving parts. The push rod has a limiting hole that matches and connects with the limiting rod on the outer frame. The push rod is connected to the moving iron core, and a space is reserved on the middle sleeve for the push rod to move. In this way, even if the push rod structure is different, as long as the reserved space is large enough, it can accommodate various push rod structures.

[0010] In addition, the shunt trip unit is equipped with a push rod, and a mounting position is reserved on the base. If an undervoltage trip unit is installed, this mounting position can be left unused. The base also has a cavity reserved for installing a micro switch, which facilitates matching with the shunt trip unit.

[0011] Furthermore, the magnetic yoke is placed inside the cavity and fixedly connected to the base.

[0012] Furthermore, one end of the moving iron core extends out of the cavity and connects to a push rod outside the cavity.

[0013] Furthermore, the base is provided with multiple reinforcing ribs to limit the movement of the magnetic yoke and prevent it from swaying back and forth or left and right.

[0014] Furthermore, the trip unit mounting base is provided with a channel on one side for the moving iron core to enter and exit.

[0015] Furthermore, the base has a positioning frame at the bottom for inserting into the middle sleeve. The positioning frame has reinforcing ribs around its perimeter to restrict the base from swaying within the middle sleeve. One side of the positioning frame is inclined, and the middle sleeve has a corresponding ramp.

[0016] Furthermore, the base is also provided with a mounting position for the top rod of the shunt trip unit.

[0017] Furthermore, the trip unit mounting base has through holes on both sides for wiring, and a wiring groove is provided at the rear of the base.

[0018] Furthermore, the left and right sides of the middle sleeve are provided with symmetrical spaces for installing the trip unit mounting base, and the space includes a mounting position that matches the base, a space for installing the push rod, and a space for installing the release trip unit top rod.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] 1. This invention addresses the structural similarities between shunt trip units and undervoltage trip units by designing a universal mounting device. The common parts, such as the magnetic yoke, are fixed within the internal cavity of the mounting device to prevent shaking. The different parts, such as the main moving parts like the push rod, do not require limiting. They can be accommodated by creating mounting spaces within the circuit breaker, thus providing room for movement. Therefore, this invention is applicable to both shunt trip units and undervoltage trip units, saving parts and reducing costs.

[0021] 2. The structure of the shunt undervoltage release device has been simplified, making it more reliable during operation.

[0022] 3. The universal installation device designed in this invention has wiring holes on both the left and right sides and wiring grooves in the base. When installed in the middle sleeve, there is no need to select the position. Users can install the shunt trip and undervoltage release on the left or right side of the circuit breaker according to different needs, and the two can be interchanged. It has high versatility and increases the user's choice.

[0023] 4. The installation device designed in this invention also has reserved mounting rods for installing shunt trip units and mounting positions for micro switches. The middle sleeve also has reserved spaces for installing shunt trip unit mounting rods. These reserved mounting positions and spaces can meet the requirements of changes in the trip unit structure and have a wide range of applications. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the trip unit in this invention;

[0025] Figure 2 This is a schematic diagram of the shunt trip unit structure of the present invention;

[0026] Figure 3 This is a cross-sectional view of the shunt trip unit of the present invention installed in the base;

[0027] Figure 4 This is a schematic diagram of the structure of the shunt trip unit base of the present invention;

[0028] Figure 5 This is a schematic diagram of the shunt trip unit of the present invention installed on the intermediate sleeve;

[0029] Figure 6 This is a magnified view of the base installed in the middle sleeve position;

[0030] Figure 7 This is a side view of the shunt undervoltage release device installed in the intermediate sleeve;

[0031] Figure 8 This is a schematic diagram of the undervoltage release mechanism of the present invention;

[0032] Figure 9 This is a schematic diagram of the undervoltage release device of the present invention installed on the intermediate sleeve;

[0033] Figure 10 This is a schematic diagram of the installation structure of the magnetic yoke of the present invention mounted on the base;

[0034] The diagram shows the following components: 1. Middle sleeve; 2. Top cover; 21. Elastic buckle; 22. Insert piece; 3. Push rod; 4. Static iron core; 5. Moving iron core; 6. Base; 61. First reinforcing rib; 62. Second reinforcing rib; 63. Third reinforcing rib; 64. Positioning frame; 65. Inclined edge; 7. Screw; 8. Top rod; 9. Magnetic yoke; 10. Outer frame; 11. Wiring groove; 12. First through hole; 13. Second through hole; 14. Fourth reinforcing rib; 15. First mounting space; 16. Second mounting space; 17. First step; 18. Second step; 19. Third mounting space; 20. Limiting rod. Detailed Implementation

[0035] The following description, in conjunction with schematic diagrams, details the mounting device for both shunt trip and undervoltage trip devices of the present invention, illustrating preferred embodiments of the invention. It should be understood that those skilled in the art can modify the invention described herein while still achieving its advantageous effects. Therefore, the following description should be understood as being of general knowledge to those skilled in the art and is not intended to limit the invention.

[0036] The shunt trip unit is a short-time duty unit. When current appears in the coil, the shunt trip unit is energized, and the internal moving iron core overcomes the spring force to engage, driving the push rod of the shunt trip unit to move backward, pulling the traction rod of the circuit breaker, thereby triggering the moving mechanism of the circuit breaker and tripping the circuit breaker.

[0037] The undervoltage release is a long-time operating device. When the voltage is insufficient, the force of the iron core inside the undervoltage release cannot overcome the spring force, and the moving iron core separates from the stationary iron core, thereby driving the push rod of the undervoltage release forward. The push rod pushes the traction rod, which in turn triggers the moving mechanism of the circuit breaker, causing the mechanism to trip.

[0038] Shunt trip units and undervoltage trip units share some structural similarities but also have some differences. The main similarities lie in the components of the trip unit that need to be protected from movement during use, such as... Figure 1 As shown, both the shunt trip and the undervoltage trip are equipped with a magnetic yoke 9, an outer frame 10, a coil, a moving iron core 5, a stationary iron core 4, a spring, and a push rod 3. The outer frame 10 is installed inside the magnetic yoke 9, the coil is wound on the outer frame 10, the stationary iron core 4 is installed inside the outer frame 10, and the spring is located between the moving iron core 5 and the stationary iron core 4. Figure 2-3As shown, one end of the moving iron core 5 is placed inside the outer frame 10, and the other end passes through the outer frame 10 and is connected to the push rod 3. The shunt trip unit and the undervoltage trip unit also differ in structure, such as the push rod structure. The shunt trip unit also has a micro switch inside. The normally closed terminal of the micro switch is connected in series with the coil of the shunt trip unit through a wire. The shunt trip unit also has a push rod inside. After the shunt trip unit is activated, the push rod will push the micro switch from the normally closed contact to the normally open contact, thereby cutting off the voltage of the shunt trip unit coil.

[0039] The present invention provides a universal mounting device for shunt trip and undervoltage trip, comprising a base 6 and an upper cover 2. The base 6 and the upper cover 2 are interlocked to form a trip unit mounting seat. The trip unit mounting seat has a cavity for mounting the shunt trip and the undervoltage trip. The base 6 is mounted on the middle sleeve 1.

[0040] The base 6 and the top cover 2 can be fixed in various ways, such as by snap-fit, plug-in, screw-in, etc. In one embodiment, the top cover 2 has connecting grooves on both sides, and the bottom of the connecting grooves has an elastic buckle 21. The base 6 also has two corresponding connecting grooves. The top of the connecting grooves is flush with the side wall of the base 6 and has a slot. The elastic buckle 21 is inserted into the corresponding slot. At the same time, the bottom of the top cover 2 has an insert 22, and the base 6 has a corresponding slot. The insert 22 is inserted into the slot. The elastic buckles 21 on both sides and the bottom insert 22 form a triangular fixing structure, which can firmly fasten the top cover 2 and the base 6 and make it easy to disassemble. It can be opened by simply squeezing the elastic buckle 21.

[0041] The shunt trip unit and the undervoltage trip unit, which have the same structure, can both be fixed in the aforementioned cavity, such as... Figure 2-3 As shown, the magnetic yoke 9, along with the outer frame 10, coil, stationary iron core 4, and spring located within the magnetic yoke 9, are all fixed within the base 6. The magnetic yoke 9 is fixedly connected to the base by screws 7. One end of the moving iron core 5 protrudes from the cavity and connects to the push rod 3 outside the cavity. A channel for the moving iron core 5 to enter and exit is provided on one side of the trip unit mounting base.

[0042] To prevent the magnetic yoke 9 from moving or shaking within the cavity, multiple reinforcing ribs can be installed inside the base for limiting its movement. In one embodiment, such as... Figure 4 As shown, two first reinforcing ribs 61 are provided on one side of the base 6 to prevent the magnetic yoke 9 from moving back and forth. Third reinforcing ribs 63 are also provided on both sides of the base 6 to prevent the magnetic yoke 9 from swaying left and right. The number and position of the reinforcing ribs can be adjusted according to actual needs.

[0043] The base 6 is fixed to the middle sleeve 1 of the circuit breaker. Symmetrical spaces for installing the trip unit mounting bases are provided on the left and right sides of the middle sleeve 1. These spaces include mounting positions that match the base 6, and a first mounting space 15 for installing the push rod 3 (e.g., ...). Figure 6As shown), and the space for installing the release trip unit push rod (as shown). Figure 6 Second installation slot 16 and third installation slot 19).

[0044] The installation structure of the base 6 and the middle sleeve 1 only needs to ensure that the base 6 is stably fixed inside the middle sleeve 1. In one embodiment, the bottom of the base 6 is provided with a positioning frame 64 for inserting into the middle sleeve 1. The positioning frame 64 is surrounded by reinforcing ribs 63 that restrict the base from swaying inside the middle sleeve 1. One side of the positioning frame 64 is shaped like an inclined edge 65, and a step is provided at the corner (e.g., Figure 2 As shown, the middle sleeve 1 has a corresponding ramp inside, which facilitates insertion along the ramp during installation. The middle sleeve 1 also has a first step 17 and a second step 18. The first step 17 matches the step at the corner of the positioning frame 64, which serves as a guide during installation and prevents the trip unit from wobbling left and right after installation. The second step 18 matches the rear of the base to prevent the trip unit from wobbling back and forth.

[0045] like Figure 4 As shown, the trip unit mounting base has through holes on both sides for wiring: a first through hole 12 and a second through hole 13. A wiring groove 11 is provided at the rear of the base 6. Depending on the installation position, the wiring can be guided from the wiring groove 11 and led out through either the left or right through hole. The middle sleeve 1 also has two symmetrical installation spaces, allowing users to install the shunt trip and undervoltage trip units on the left or right side of the circuit breaker according to different needs. Furthermore, their positions are interchangeable, offering high versatility and increasing user choice. Figure 5 As shown.

[0046] In addition, the shunt trip unit is equipped with a push rod 8, and a mounting position is reserved on the base. If an undervoltage trip unit is installed, this mounting position can be left unused. The base 6 also has a cavity reserved for installing a micro switch, which facilitates matching with the shunt trip unit.

[0047] Besides the common components in the shunt trip unit and the undervoltage trip unit, there are also different components, such as the push rods. The shunt trip unit push rod 3 and the undervoltage trip unit push rod 3' (e.g., Figure 8 Although the structures shown are different, they are all moving parts and do not need to be fixed. The push rod has a limiting hole, which matches and connects with the limiting rod 20 on the outer frame 10. The push rod is connected to the moving iron core 5, and a space is reserved on the middle sleeve 1 for the push rod to move (e.g., Figure 6 The first installation slot 15 in the middle is provided so that even if the push rod structure is different, as long as the reserved slot is large enough, it can accommodate various push rod structures.

[0048] like Figure 8-10As shown, the moving iron core 5 of the undervoltage release is connected to the push rod 3'. The mounting structure consisting of the upper cover 2 and the base 6 has through holes 12 and 13 on both sides. The base 6 has a wiring groove 11. Although the structure of the push rod 3' is different from that of the shunt release push rod 3, the structure of the magnetic yoke 9 is the same. Therefore, the structures of the base 6 and the upper cover 2 are the same.

[0049] During installation, such as Figure 7 As shown, insert the base 6 into the middle sleeve 1 and fix it in the installation direction.

[0050] It should be noted that the ordinal adjectives “first,” “second,” “third,” “fourth,” etc. used in this invention to describe common objects only indicate different instances of the same object. The terms “left,” “right,” etc., indicating location only indicate one possible situation in the embodiments, and are not intended to imply that the objects described in this way must be in a given order or location, whether temporally, spatially, sequentially, or in any other way.

[0051] The above are merely preferred embodiments of the present invention and do not constitute any limitation on the present invention. Any equivalent substitutions or modifications made by those skilled in the art to the technical solutions and content disclosed in the present invention without departing from the scope of the present invention shall be deemed to have remained within the protection scope of the present invention.

Claims

1. A universal mounting device for shunt trip units and undervoltage trip units, characterized in that, It includes a base and a top cover, which are interlocked to form a trip unit mounting base. The trip unit mounting base has a cavity for installing a shunt trip unit and an undervoltage trip unit. The base is mounted on the middle sleeve. Both the shunt trip and the undervoltage trip are provided with a magnetic yoke, an outer frame, a coil, a moving iron core, a stationary iron core, a spring, and a push rod. The outer frame is set inside the magnetic yoke, the coil is wound on the outer frame, the stationary iron core is set inside the outer frame, the spring is located between the moving iron core and the stationary iron core, one end of the moving iron core is placed inside the outer frame, and the other end passes through the outer frame and is connected to the push rod. The base is equipped with multiple reinforcing ribs to limit the movement of the magnetic yoke and prevent it from swaying back and forth or left and right. The base has a positioning frame at the bottom for inserting into the middle sleeve. The positioning frame is surrounded by reinforcing ribs that restrict the base from swaying inside the middle sleeve. One side of the positioning frame is inclined, and the middle sleeve has a corresponding slope. The middle sleeve has symmetrical spaces on its left and right sides for installing the trip unit mounting base, and the space includes a mounting position that matches the base, a space for installing the push rod, and a space for installing the release trip unit top rod; both sides of the trip unit mounting base are provided with through holes for wiring, and the base is provided with a wiring groove at the rear.

2. The mounting device for both shunt trip and undervoltage trip as described in claim 1, characterized in that, The magnetic yoke is placed inside the cavity and is fixedly connected to the base.

3. The mounting device for both shunt trip and undervoltage trip as described in claim 1, characterized in that, One end of the moving iron core extends out of the cavity and is connected to a push rod outside the cavity.

4. The mounting device for both shunt trip and undervoltage trip as described in claim 1, characterized in that, The trip unit mounting base has a channel on one side for the moving iron core to enter and exit.

5. The mounting device for both shunt trip and undervoltage trip as described in claim 1, characterized in that, The base is also provided with a mounting position for installing the shunt trip unit top rod.

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