Passive shunt excitation auxiliary integrated release convenient to assemble

Abstract

The utility model discloses a passive shunt-excitation auxiliary integrated release convenient to assemble, which relates to the technical field of low-voltage electric appliances and has dual functions of shunt-excitation release and auxiliary contact. Comprising a shunt microswitch and an auxiliary microswitch, a handle is rotationally connected to a shell, a coil is fixedly installed in the shell, a telescopic ejector rod is arranged at the output position of the coil, a tripping mechanism is in linkage connection with the ejector rod, a contact mechanism is in linkage connection with the handle, and the coil is further connected with the shunt microswitch and the auxiliary microswitch through wires. The contact mechanism abuts against and cooperates with the on-off position of the shunt microswitch and the on-off position of the auxiliary microswitch so as to switch the on-off state. Dual functions of shunt tripping and assisting are realized, and the shunt tripping and assisting devices are integrated in one shell, so that the size is reduced, and the space of a distribution box is saved; moreover, the microswitch is used for replacing a traditional contact connection mode, installation and debugging of the microswitch are relatively simple, and complexity and time in the assembling process are reduced.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, and in particular to a passive shunt trip unit that is easy to assemble. Background Technology

[0002] The main function of a shunt trip unit is to quickly trip the circuit breaker upon receiving a specific electrical signal (usually a voltage signal), achieving rapid circuit disconnection. It is particularly suitable for applications requiring remote control or automatic response, such as cutting off non-fire-fighting power supplies in fire protection systems. There are two types of shunt trip units on the market: one is a single-function shunt trip unit containing only the shunt trip unit; the other, within an 18mm plastic housing, includes both the shunt trip unit and an auxiliary contact unit, increasing cost and occupying space in the distribution box. Furthermore, the contact connections of commercially available shunt trip units switch via contact points. Accurate positioning of these contacts during assembly is crucial for their effective operation; even slight deviations can lead to poor contact or increased contact resistance, affecting the trip unit's performance. This high assembly quality requirement is detrimental to manufacturing. Summary of the Invention

[0003] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a passive shunt trip auxiliary integrated trip unit that is easy to assemble. Through integrated improvement, it reduces size and cost, improves reliability and production efficiency, and has the dual functions of shunt trip and auxiliary contact, meeting the needs of more application scenarios.

[0004] The technical solution of this utility model includes a housing, a handle, a coil, a tripping mechanism, a contact mechanism, a terminal block, a shunt micro switch, and an auxiliary micro switch. The handle is rotatably connected to the housing, and the coil is fixedly installed inside the housing. The output position of the coil has a retractable push rod. The tripping mechanism is linked to the push rod, and the contact mechanism is linked to the handle. The coil is also connected to the shunt micro switch and the auxiliary micro switch by wires respectively. The contact mechanism is respectively engaged with the opening and closing positions of the shunt micro switch and the auxiliary micro switch to switch the switch state.

[0005] Using the above technical solution, when the external control system sends an electrical signal to the coil, the coil pushes the push rod to extend, triggering the tripping mechanism to quickly trip the circuit breaker and disconnect the circuit. The contact mechanism moves accordingly under force, triggering the shunt trip micro switch and the auxiliary micro switch, switching their states. The shunt trip micro switch provides a shunt trip indication function to ensure the safety of the shunt tripping system, while the auxiliary micro switch provides auxiliary contact signals to indicate the status of the circuit breaker. This achieves dual functions of shunt tripping and auxiliary operation, integrated into a single housing, reducing volume and saving space in the distribution box. Furthermore, by using micro switches instead of traditional contact connections, the installation and debugging of micro switches are relatively simple, reducing the complexity and time in the assembly process, avoiding the excessively high requirements for the original contact connection assembly precision, and reducing the risk of poor contact or increased contact resistance.

[0006] In one possible design, the tripping mechanism includes a lever, a return torsion spring, and a trip latch. The lever is hinged inside the housing, and the return torsion spring is installed at the hinge fulcrum of the lever. Both ends of the return torsion spring abut against the lever and the housing, respectively. The upper and lower positions of one end of the lever abut against the trip latch and the push rod, respectively, and the other end is limited by the housing. The trip latch extends out of the housing and connects to the tripping position of the matched circuit breaker.

[0007] The above design ensures a rapid response to the tripping action, enabling the tripping operation to be completed in a very short time, thus improving the response speed. When the coil is de-energized, the electromagnetic force disappears, and the elastic force of the reset torsion spring restores the lever to its initial position, ensuring timely and rapid reset. At the same time, it makes the tripping mechanism simple and compact, reducing the number of parts and simplifying the assembly process.

[0008] In one possible design, the shunt micro switch and the auxiliary micro switch each have contact arms at their open and closed positions; the contact mechanism includes a pull rod, a contact support, and a compression spring, the contact support is rotatably connected inside the housing, the two ends of the pull rod are respectively hinged to the handle and one end of the contact support, and the other end of the contact support is respectively engaged with the two contact arms; a boss is fixed on the side of the contact support, and the compression spring is installed between the boss and the inner wall of the housing.

[0009] With the above design, the contact support is connected to the handle via a lever. When the handle is moved, the lever rotates the contact support, and the other end of the contact support abuts against the contact arm of the micro switch. Through the elastic assistance of the compression spring, the feedback is immediately transmitted to the micro switch, providing instantaneous status feedback and rapidly switching the state of the micro switch. This ensures the micro switch's fast response and sensitive switching.

[0010] In one possible design, the terminals are divided into shunt terminals and auxiliary terminals. The shunt micro switch is connected to the shunt terminals and the coil via wires, and the auxiliary micro switch is connected to the auxiliary terminals.

[0011] By adopting the above design and arranging the wiring method reasonably, cross-wiring between the shunt excitation indicator and the auxiliary alarm function can be avoided.

[0012] In one possible design, at least two pillars are integrally provided inside the housing. The shunt micro switch and the auxiliary micro switch are respectively provided with positioning holes arranged along the thickness direction. The shunt micro switch and the auxiliary micro switch are stacked along the thickness direction, and the pillars are inserted into the corresponding positioning holes.

[0013] With the above design, each column passes through two corresponding positioning holes of the switch at the same time, fixing the micro switch in the housing. This ensures the precise positioning of the shunt micro switch and the auxiliary micro switch during assembly, making the assembly method faster and more convenient. Moreover, the shunt micro switch and the auxiliary micro switch are stacked along the thickness direction, making full use of the space inside the housing, reducing the overall volume, and making the trip unit more compact and lightweight. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a specific embodiment of the present utility model. Figure 1 ;

[0015] Figure 2 This is a schematic diagram of the structure of a specific embodiment of the present utility model. Figure 2 ;

[0016] The components are as follows: 1. Housing; 11. Column; 2. Handle; 3. Coil; 31. Top rod; 4. Tripping mechanism; 41. Lever; 42. Return torsion spring; 43. Tripping buckle; 5. Contact mechanism; 51. Pull rod; 52. Contact support; 521. Boss; 53. Compression spring; 6. Shunt micro switch; 61. Contact arm; 7. Auxiliary micro switch; 8. Terminal; 81. Shunt terminal; 82. Auxiliary terminal. Detailed Implementation

[0017] like Figure 1 , Figure 2The passive shunt-excitation auxiliary integrated trip unit shown includes a housing 1, a handle 2, a coil 3, a tripping mechanism 4, a contact mechanism 5, a terminal block 8, a shunt-excitation micro switch 6, and an auxiliary micro switch 7. The handle 2 is rotatably connected to the housing 1 for connection with the handle 2 of the matched circuit breaker, forming a linkage. The coil 3 is fixedly installed inside the housing 1, and its output position has a retractable push rod 31. The coil 3 receives external electrical signals, and the push rod 31 extends and retracts in response to these signals. The tripping mechanism 4 is linked to the push rod 31, and the contact mechanism 5 is linked to the handle 2. The tripping mechanism 4 is driven by the push rod 31 to achieve rapid tripping of the circuit breaker. The contact mechanism 5 is responsible for connecting and disconnecting the contacts, ensuring the continuity of the circuit. The coil 3 is also wired to the shunt-excitation micro switch 6 and the auxiliary micro switch 7 respectively. The contact mechanism 5 cooperates with the open and closed positions of the shunt-excitation micro switch 6 and the auxiliary micro switch 7 to switch the switching states.

[0018] Functional Principle: 1. Shunt Trip Function: When the external control system sends an electrical signal to coil 3, coil 3 generates electromagnetic force, pushing push rod 31 to extend; the extension of push rod 31 triggers tripping mechanism 4, causing the circuit breaker to trip quickly and disconnect the circuit; when the electrical signal disappears, coil 3 no longer generates electromagnetic force, and the elastic force of reset torsion spring 42 resets push rod 31, and the circuit breaker can be reset manually or automatically.

[0019] II. Auxiliary contact function: The contact mechanism 5 is linked with the handle 2. When the handle 2 is activated, the contact mechanism 5 moves accordingly. The movement of the contact mechanism 5 will trigger the shunt micro switch 6 and the auxiliary micro switch 7, causing them to switch states. The state changes of the shunt micro switch 6 and the auxiliary micro switch 7 can be detected by the external control system, providing the circuit breaker's state information.

[0020] Specifically, the tripping mechanism 4 is linked to the push rod 31, and the circuit breaker is quickly tripped through the extension and retraction of the push rod 31. The extension and retraction of the push rod 31 is driven by electromagnetic force, realizing passive control and reducing dependence on external power supply. The use of microswitches replaces the traditional contact connection method, reducing the risk of poor contact or increased contact resistance, and improving the reliability and performance of the system.

[0021] The tripping mechanism 4 includes a lever 41, a return torsion spring 42, and a trip latch 43. The lever 41 is hinged inside the housing 1 and can rotate around the hinge point. The return torsion spring 42 is installed at the hinge point of the lever 41, and its two ends abut against the lever 41 and the housing 1, respectively. The upper and lower positions of one end of the lever 41 are respectively engaged with the trip latch 43 and the push rod 31, while the other end is engaged with the housing 1 for limiting. The trip latch 43 extends out of the housing 1 and connects to the tripping position of the matched circuit breaker. When the coil 3 is energized and generates electromagnetic force, the push rod 31 extends rapidly, pushing one end of the lever 41 upward and causing the trip latch 43 to actuate, thus tripping the circuit breaker. When the coil 3 is de-energized, the electromagnetic force disappears, and the elastic force of the return torsion spring 42 causes the lever 41 to return to its initial position, the push rod 31 resets, and the circuit breaker can be reset manually or automatically. Due to the limiting relationship between the lever 41 and the housing 1, it will not fully contact the push rod 31 during reset.

[0022] The shunt microswitch 6 and the auxiliary microswitch 7 each have a contact arm 61 at their open and closed positions. The contact mechanism 5 includes a pull rod 51, a contact support 52, and a compression spring 53. The contact support 52 is rotatably connected to the housing 1. Both ends of the pull rod 51 are hinged to the handle 2 and one end of the contact support 52, respectively. The other end of the contact support 52 abuts against the two contact arms 61. A boss 521 is fixed to the side of the contact support 52, and the compression spring 53 is installed between the boss 521 and the inner wall of the housing 1. When the handle 2 is actuated, the pull rod 51 drives the contact support 52 to rotate. The other end of the contact support 52 abuts against the contact arm 61 of the microswitch, and the elastic force of the compression spring 53 immediately transmits the feedback to the corresponding microswitch, providing instantaneous status feedback and quickly switching the state of the microswitch.

[0023] Terminal 8 is divided into a shunt trip terminal 81 and an auxiliary terminal 82. The shunt trip microswitch 6 is connected to the shunt trip terminal 81 and the coil 3 via wires. The shunt trip microswitch 6 has two contacts. The shunt trip terminal 81 has two terminals. The two contacts of the shunt trip microswitch 6 are connected to the live wire terminal and one of the terminals of the coil 3 via wires, and the other terminal is connected to the neutral wire terminal of the coil 3 via wires. The auxiliary microswitch 7 is connected to the auxiliary terminal 82. The auxiliary microswitch 7 has three contacts, and the auxiliary terminal 82 also has three terminals, with the contacts and terminals connected correspondingly.

[0024] The housing 1 has at least two integrally formed posts 11. The shunt microswitch 6 and the auxiliary microswitch 7 each have positioning holes arranged along the thickness direction. The shunt microswitch 6 and the auxiliary microswitch 7 are stacked along the thickness direction, and their corresponding positioning holes are interconnected. Each post 11 is inserted sequentially into the corresponding positioning holes of the shunt microswitch 6 and the auxiliary microswitch 7. During assembly, simply align the microswitch with the post 11 and insert it, greatly shortening assembly time and making disassembly and maintenance much faster.

Claims

1. A passive shunt trip unit that is easy to assemble, comprising a housing (1), a handle (2), a coil (3), a tripping mechanism (4), a contact mechanism (5), and a terminal block (8), wherein the handle (2) is rotatably connected to the housing (1), the coil (3) is fixedly installed inside the housing (1), and the output position of the coil (3) has a retractable push rod (31), characterized in that: It also includes a shunt micro switch (6) and an auxiliary micro switch (7). The tripping mechanism (4) is linked to the push rod (31). The contact mechanism (5) is linked to the handle (2). The coil (3) is also connected to the shunt micro switch (6) and the auxiliary micro switch (7) respectively by wire. The contact mechanism (5) is respectively matched with the opening and closing positions of the shunt micro switch (6) and the auxiliary micro switch (7) to switch the switch state.

2. The passive shunt trip unit with easy assembly according to claim 1, characterized in that: The tripping mechanism (4) includes a lever (41), a reset torsion spring (42), and a trip buckle (43). The lever (41) is hinged inside the housing (1). The reset torsion spring (42) is installed at the hinge fulcrum of the lever (41), and the two ends of the reset torsion spring (42) abut against the lever (41) and the housing (1) respectively. The upper and lower positions of one end of the lever (41) abut against the trip buckle (43) and the push rod (31) respectively, and the other end is limited to the housing (1). The trip buckle (43) extends out of the housing (1) and connects to the tripping position of the matched circuit breaker.

3. The passive shunt trip unit with easy assembly according to claim 1 or 2, characterized in that: The opening and closing positions of the shunt micro switch (6) and the auxiliary micro switch (7) are respectively equipped with contact arms (61); the contact mechanism (5) includes a pull rod (51), a contact support (52) and a compression spring (53). The contact support (52) is rotatably connected to the housing (1). The two ends of the pull rod (51) are respectively hinged to the handle (2) and one end of the contact support (52). The other end of the contact support (52) is respectively abutted against the two contact arms (61); a boss (521) is fixed on the side of the contact support (52), and the compression spring (53) is installed between the boss (521) and the inner wall of the housing (1).

4. The passive shunt trip unit with easy assembly according to claim 1 or 2, characterized in that: The terminal (8) is divided into a shunt terminal (81) and an auxiliary terminal (82). The shunt micro switch (6) is connected to the shunt terminal (81) and the coil (3) respectively by wires. The auxiliary micro switch (7) is connected to the auxiliary terminal (82).

5. The passive shunt trip unit with easy assembly according to claim 1 or 2, characterized in that: The housing (1) is integrally provided with at least two columns (11). The shunt micro switch (6) and the auxiliary micro switch (7) are respectively provided with positioning holes arranged along the thickness direction. The shunt micro switch (6) and the auxiliary micro switch (7) are stacked along the thickness direction, and the columns (11) are inserted into the corresponding positioning holes.

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