Thermomagnetic release structure

Abstract

The invention provides a thermomagnetic release structure, which relates to the technical field of circuit breaker related equipment and comprises a conductive mechanism, a movable iron core mechanism and a magnet yoke mechanism. One end of the conductor is connected with the bimetallic element; the movable iron core mechanism is connected with the conductive mechanism; one end of the conductive plate is connected with the bimetallic element through the soft connection conductive member, and the other end is connected with the coil conductive member. The coil conductive part is wound on the outer sides of the movable iron core assembly and the static iron core and generates a magnetic field after being powered on, and the movable iron core assembly is used for moving towards the static iron core under the traction of the magnetic field so that the conductive plate can make contact with the electric conductor to be conducted and the electric conductor can be connected with the bimetallic element in parallel. According to the invention, the technical problem that a bimetallic element in a thermal release of a low-current specification product in the prior art is in a series connection directly-heated type in a whole conductive structure, and when short-circuit current passes through the bimetallic element, the bimetallic element is suddenly heated due to over-high current, so that the bimetallic element is fused is solved.

Description

Technical Field

[0001] This invention relates to the technical field of circuit breaker-related equipment, and in particular to a thermomagnetic trip unit structure. Background Technology

[0002] Thermal-magnetic trip units are common and important components used in circuit breakers; while molded case circuit breakers are protective devices used for long-delay overload and instantaneous short-circuit protection of lines, including characteristics such as ultimate short-circuit breaking capacity and current-limiting breaking capacity, and molded case circuit breakers include single-break type and double-break type.

[0003] The cost of single-break molded case circuit breakers on the market is lower than that of double-break molded case circuit breakers. For products with a small current rating of less than 32A, the bimetallic element in the thermal trip unit is a series direct-heated type in the entire conductive structure. Correspondingly, the magnetic trip unit has a solenoid or snap-fit ​​fixed value structure and is available in front-mounted or rear-mounted configurations.

[0004] When the current flowing through an electrical circuit exceeds a thousand times In, the bimetallic element cannot withstand the rapidly increasing temperature and will melt even when the breaking capacity is below the nominal breaking capacity. This phenomenon does not conform to product standards. Therefore, single-break molded case circuit breakers with low current ratings generally cannot meet the breaking capacity above 50kA, failing to meet market demands for single-break molded case circuit breakers. Summary of the Invention

[0005] The purpose of this invention is to provide a thermal-magnetic trip unit structure to alleviate the technical problem in existing low-current products where the bimetallic element in the thermal trip unit is directly heated in series throughout the conductive structure. When a short-circuit current passes through the bimetallic element, the bimetallic element heats up rapidly due to the excessive current, which in turn causes it to melt.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention provides a thermomagnetic tripping device structure, including a conductive mechanism, a moving iron core mechanism, and a magnetic yoke mechanism;

[0008] The conductive mechanism includes a conductor, a bimetallic element, a coil conductive element, and a flexible conductive element, and one end of the conductor is connected to the bimetallic element;

[0009] The moving iron core mechanism is connected to the conductive mechanism, and the moving iron core mechanism includes a moving iron core assembly and a conductive plate, wherein the moving iron core assembly is connected to the conductive plate;

[0010] One end of the conductive plate is connected to the bimetallic element via the flexible conductive component, and the other end is connected to the coil conductive component;

[0011] The magnetic yoke mechanism is connected to the conductive mechanism, and the magnetic yoke mechanism includes a stationary iron core, which is distributed opposite to the moving iron core assembly.

[0012] The coil conductive element is wound around the outside of the moving iron core assembly and the stationary iron core and generates a magnetic field after being energized. The moving iron core assembly is used to move towards the stationary iron core under the traction of the magnetic field, so that the conductive plate contacts the conductive body and conducts electricity, and realizes the parallel connection of the conductive body and the bimetallic element.

[0013] Furthermore, the conductor includes a first connecting part, a supporting part, a fixing part, and a second connecting part. The first connecting part is connected to the fixing part through the supporting part, and the first connecting part is used to connect with the conductive plate when the moving iron core assembly moves towards the stationary iron core under the traction of a magnetic field.

[0014] The fixing part is connected to the bimetallic element, and the end of the fixing part away from the support part is connected to the second connecting part.

[0015] Furthermore, one end of the bimetallic element is connected to the fixing part by a rivet, and the other end of the bimetallic element is provided with a bimetallic adjusting screw.

[0016] Furthermore, the conductive mechanism also includes an output terminal, a lower mounting base, and a moving contact. The lower mounting base is connected to the moving iron core mechanism, and the lower mounting base contains the coil conductive element and the magnetic yoke mechanism.

[0017] The outgoing terminal is connected to the end of the coil conductive element away from the conductive plate;

[0018] The moving contact is connected to the second connection part via a wire.

[0019] Furthermore, the moving iron core mechanism also includes an upper mounting base, which is connected to the conductive mechanism, and the moving iron core assembly is housed inside the upper mounting base.

[0020] Furthermore, the moving iron core assembly includes a moving iron core and a compression spring, with one end of the moving iron core inserted into the compression spring and disposed together with the compression spring within the magnetic yoke mechanism;

[0021] The other end of the moving iron core is connected to the conductive plate.

[0022] Furthermore, the moving iron core assembly also includes an insulating pad, which is connected to the moving iron core and is used to limit the position of the conductive plate.

[0023] Furthermore, the moving iron core mechanism also includes a striking component, which is connected to the end of the moving iron core away from the compression spring, and the striking component is slidably connected to the upper mounting base.

[0024] Furthermore, the striking assembly includes a striking element, a transmission element, a rotating shaft, and a linkage shaft, wherein the striking element is slidably connected to the upper mounting base;

[0025] The transmission component is rotatably connected to the upper mounting base via the rotating shaft, and one end of the transmission component is connected to the moving iron core via the linkage shaft, while the other end is connected to the striking component. The moving iron core assembly is used to drive the striking component to move via the transmission component.

[0026] Furthermore, the magnetic yoke mechanism also includes an insulating sleeve, a magnetic yoke body, and a magnetic yoke plate. The insulating sleeve is connected to the magnetic yoke body and is disposed within the space in which the coil conductive element is wound.

[0027] One end of the stationary iron core is connected to the magnetic yoke body, and the other end is inserted into the insulating sleeve;

[0028] Both the moving iron core and the compression spring are inserted into the insulating sleeve, and the moving iron core is connected to the stationary iron core through the compression spring;

[0029] The magnetic yoke plate is connected to the magnetic yoke body, and the magnetic yoke plate is connected to the end of the insulating sleeve away from the stationary iron core.

[0030] The present invention can achieve the following beneficial effects:

[0031] In a first aspect, the present invention provides a thermomagnetic trip device structure, comprising a conductive mechanism, a moving iron core mechanism, and a magnetic yoke mechanism; the conductive mechanism includes a conductor, a bimetallic element, a coil conductive element, and a flexible conductive element, and one end of the conductor is connected to the bimetallic element; the moving iron core mechanism is connected to the conductive mechanism, and the moving iron core mechanism includes a moving iron core assembly and a conductive plate, the moving iron core assembly being connected to the conductive plate; one end of the conductive plate is connected to the bimetallic element via the flexible conductive element, and the other end is connected to the coil conductive element; the magnetic yoke mechanism is connected to the conductive mechanism, and the magnetic yoke mechanism includes a stationary iron core, the stationary iron core and the moving iron core assembly being distributed opposite to each other; the coil conductive element is wound around the outside of the moving iron core assembly and the stationary iron core and generates a magnetic field after being energized, the moving iron core assembly being used to move towards the stationary iron core under the traction of the magnetic field, so that the conductive plate contacts and conducts electricity, and realizes the parallel connection of the conductor and the bimetallic element.

[0032] In this invention, the conductive mechanism and the moving iron core mechanism are detachably connected, and the conductive mechanism includes at least a conductor, a bimetallic element, a coil conductive element, and a flexible conductive element. The conductor is connected to the bimetallic element, which is connected to the conductive plate of the moving iron core mechanism via the flexible conductive element. The other end of the conductive plate is connected to the coil conductive element, thus forming a path in which the conductor, bimetallic element, flexible conductive element, conductive plate, and coil conductive element are sequentially connected. In use, when the current flowing through this path is too large, the magnetic field formed by the coil conductive element is enhanced, thereby driving the moving iron core assembly located within this field to move. Correspondingly, the conductive plate connected to the moving iron core assembly will move synchronously until it contacts and conducts electricity with the conductor. At this point, a parallel connection between the conductor and the bimetallic element is formed, thus preventing the bimetallic element from rapidly heating up and melting due to excessive current flowing through it.

[0033] Compared with the prior art, the thermomagnetic trip structure provided by the present invention forms a magnetic field after the coil conductive element is energized. After the magnetic field increases to a certain extent, it drives the moving iron core assembly to move, thereby synchronously driving the conductive plate to move until it is connected to the conductor and energized, so as to realize the parallel connection of the conductor and the bimetallic element. At this time, the current flowing through the bimetallic element can be reduced, thereby avoiding the problem of the bimetallic element overheating or even melting due to excessive current.

[0034] In summary, this invention at least alleviates the technical problem in existing low-current products where the bimetallic element in the thermal trip unit is directly heated in series throughout the conductive structure. When a short-circuit current passes through the bimetallic element, the bimetallic element experiences a rapid temperature rise due to excessive current, which in turn causes it to melt. Attached Figure Description

[0035] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0036] Figure 1 This is a three-dimensional structural diagram of the thermomagnetic trip unit structure provided in an embodiment of the present invention;

[0037] Figure 2 This is a front view schematic diagram of the magnetic yoke mechanism of the thermomagnetic trip unit structure provided in an embodiment of the present invention;

[0038] Figure 3 for Figure 2 Schematic diagram of the AA section structure;

[0039] Figure 4 A three-dimensional schematic diagram of the moving iron core mechanism of the thermomagnetic trip unit structure provided in an embodiment of the present invention;

[0040] Figure 5 A top view schematic diagram of the moving iron core mechanism of the thermomagnetic trip unit structure provided in an embodiment of the present invention;

[0041] Figure 6 for Figure 5 Schematic diagram of the BB cross-section structure;

[0042] Figure 7 A three-dimensional schematic diagram of the conductive mechanism of the thermomagnetic trip unit structure provided in an embodiment of the present invention;

[0043] Figure 8 A front view schematic diagram of the conductive mechanism of the thermomagnetic trip unit structure provided in an embodiment of the present invention;

[0044] Figure 9 A three-dimensional structural diagram of the conductive body of the thermomagnetic trip unit structure provided in an embodiment of the present invention;

[0045] Figure 10 A schematic diagram of the internal structure of the thermomagnetic trip unit provided in the embodiment of the present invention under normal and overload conditions;

[0046] Figure 11 A schematic diagram of the internal structure of the thermomagnetic trip unit provided in an embodiment of the present invention under a short-circuit state;

[0047] Figure 12 This is a schematic diagram illustrating the current shunting principle of the thermomagnetic trip unit structure provided in an embodiment of the present invention.

[0048] Icons: 1-Conductive mechanism; 11-Conductor; 111-First connecting part; 112-Support part; 113-Fixing part; 114-Second connecting part; 12-Bimetallic element; 121-Rivet; 122-Bimetallic adjusting screw; 13-Outgoing terminal; 14-Coil conductive component; 15-Flexible conductive component; 16-Lower mounting base; 17-Moving contact; 2-Moving iron core mechanism; 21-Upper mounting base; 22-Conductive plate; 23-Moving iron core; 24-Compression spring; 25-Striking component; 26-Transmission component; 27-Rotating shaft; 28-Linkage shaft; 29-Insulating pad; 3-Magnetic yoke mechanism; 31-Insulating sleeve; 32-Magnetic yoke body; 33-Stationary iron core; 34-Magnetic yoke plate. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0050] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0051] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0052] In the description of this invention, it should be noted that the terms "upper," "lower," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and 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, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0053] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0054] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0055] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0056] Example 1

[0057] This embodiment provides a thermomagnetic trip unit structure, referencing... Figure 1 , Figure 4 and Figure 7 The thermomagnetic trip unit structure includes a conductive mechanism 1, a moving iron core mechanism 2, and a magnetic yoke mechanism 3. The conductive mechanism 1 includes a conductor 11, a bimetallic element 12, a coil conductor 14, and a flexible conductor 15, with one end of the conductor 11 connected to the bimetallic element 12. The moving iron core mechanism 2 is connected to the conductive mechanism 1 and includes a moving iron core assembly and a conductive plate 22, which is connected to the conductive plate 22. One end of the conductive plate 22 is connected to the bimetallic element 12 via the flexible conductor 15, and the other end is connected to the coil conductor 14. The magnetic yoke mechanism 3 is connected to the conductive mechanism 1 and includes a stationary iron core 33, which is distributed opposite to the moving iron core assembly. The coil conductor 14 is wound around the outside of the moving iron core assembly and the stationary iron core 33 and generates a magnetic field after being energized. The moving iron core assembly is used to move towards the stationary iron core 33 under the traction of the magnetic field, so that the conductive plate 22 is connected to the conductor 11 and the conductor 11 is connected in parallel with the bimetallic element 12.

[0058] The embodiments of the present invention at least alleviate the technical problem existing in the prior art where the bimetallic element in the thermal trip unit is directly heated in series throughout the entire conductive structure. When a short-circuit current passes through the bimetallic element, the bimetallic element heats up rapidly due to the excessive current, which in turn causes it to melt.

[0059] In this embodiment of the invention, the conductive mechanism 1 and the moving iron core mechanism 2 are detachably connected, and the conductive mechanism 1 includes at least a conductor 11, a bimetallic element 12, a coil conductive element 14, and a flexible conductive element 15; wherein, the conductor 11 is connected to the bimetallic element 12, and the bimetallic element 12 is connected to the conductive plate 22 of the moving iron core mechanism through the flexible conductive element 15, and the other end of the conductive plate 22 is connected to the coil conductive element 14, thereby forming a passage in which the conductor 11, the bimetallic element 12, the flexible conductive element 15, the conductive plate 22, and the coil conductive element 14 are connected in sequence; see reference. Figure 10 , Figure 11 and Figure 12 When in use, when the current flowing through this path is too large, the magnetic field formed by the coil conductor 14 is strengthened, which in turn drives the moving iron core assembly located in this field to move. Correspondingly, the conductive plate 22 connected to the moving iron core assembly will move synchronously until it contacts the conductor 11 and conducts. At this time, the conductor 11 and the bimetallic element 12 are connected in parallel, thus avoiding the situation where the bimetallic element 12 heats up rapidly and melts due to the excessive current flowing through it.

[0060] Compared with the prior art, the thermomagnetic trip structure provided in this embodiment of the invention forms a magnetic field after the coil conductive element 14 is energized. After the magnetic field increases to a certain extent, it drives the moving iron core assembly to move, thereby synchronously driving the conductive plate 22 to move until it is connected to the conductor 11 and energized, so as to realize the parallel connection of the conductor 11 and the bimetallic element 12. At this time, the current flowing through the bimetallic element 12 can be reduced, thereby avoiding the problem of the bimetallic element 12 overheating or even melting due to excessive current.

[0061] In an optional implementation of this embodiment, refer to Figure 9 The conductor 11 includes a first connecting part 111, a supporting part 112, a fixing part 113, and a second connecting part 114. The first connecting part 111 is connected to the fixing part 113 through the supporting part 112, and the first connecting part 111 is used to connect with the conductive plate 22 when the moving iron core assembly moves towards the stationary iron core 33 under the traction of the magnetic field. The fixing part 113 is connected to the bimetallic element 12, and the end of the fixing part 113 away from the supporting part 112 is connected to the second connecting part 114.

[0062] Specifically, the first connecting part 111, the supporting part 112, the fixing part 113, and the second connecting part 114 are connected in sequence. Preferably, the first connecting part 111 and the second connecting part 114 can be horizontally distributed, while the fixing part 113 is used to connect with the bimetallic element 12, and there is a gap between the supporting part 112 and the bimetallic element 12.

[0063] Further, refer to Figure 8 One end of the bimetallic element 12 is connected to the fixing part 113 by a rivet 121, and the other end of the bimetallic element 12 is provided with a bimetallic adjusting screw 122.

[0064] Specifically, one end of the bimetallic element 12 is connected to the fixing part 113 via a rivet 121. Preferably, there are two rivets 121 for connecting one end of the bimetallic element 12 to the fixing part 113. It should be emphasized that the connection between the bimetallic element and the fixing part 113 can also be an electric welding connection.

[0065] In an optional implementation of this embodiment, refer to Figure 7 or Figure 8 The conductive mechanism 1 also includes a lead-out terminal 13, a lower mounting base 16, and a moving contact 17. The lower mounting base 16 is connected to the moving iron core mechanism 2, and the lower mounting base 16 contains a coil conductive element 14 and a magnetic yoke mechanism 3. The lead-out terminal 13 is connected to the end of the coil conductive element 14 away from the conductive plate 22. The moving contact 17 is connected to the second connecting part 114 through a wire.

[0066] Specifically: the lower mounting base 16 has an accommodating space for placing the coil conductor 14 and the magnetic yoke mechanism 3, while the moving contact 17 is electrically connected to the second connecting part 114 via a wire, and the output terminal 13 is connected to the coil conductor 14; see reference. Figure 10 and Figure 11 The current flows from the moving contact 17, passes through various components, and finally passes through the output terminal 13.

[0067] In an optional implementation of this embodiment, refer to Figure 4 The moving iron core mechanism 2 also includes an upper mounting base 21, which is connected to the conductive mechanism 1, and the moving iron core assembly is housed inside the upper mounting base 21.

[0068] Specifically: the upper mounting base 21 is connected to the lower mounting base 16 of the conductive mechanism 1, and preferably, the upper mounting base 21 is provided with symmetrical buckles on both sides, that is, the upper mounting base 21 is detachably connected to the lower mounting base 16 through buckles, and the moving iron core assembly is located inside the upper mounting base 21.

[0069] Further, refer to Figure 4 or Figure 6 The moving iron core assembly includes a moving iron core 23 and a compression spring 24. One end of the moving iron core 23 is inserted into the compression spring 24 and together with the compression spring 24, it is located in the magnetic yoke mechanism 3; the other end of the moving iron core 23 is connected to the conductive plate 22.

[0070] Specifically: one end of the moving iron core 23 is inserted into and fixed in the compression spring 24, while the other end of the compression spring 24 is connected to the stationary iron core 33, and the top of the moving iron core 23 is connected to the conductive plate 22; in use, refer to... Figure 10 Under normal or overload conditions, the magnetic force generated by the coil conductor 14 drives the moving iron core 23 to move towards the stationary iron core 33. At this time, due to the elastic force of the compression spring 24, it counteracts the gravity of the moving iron core 23 and the magnetic attraction it receives, thus preventing the conductive plate 22 from contacting the conductor 11. However, under short-circuit conditions, refer to... Figure 11 The coil conductor 14 generates excessive magnetic force, and the elastic force of the compression spring 24 cannot support the magnetic force received by the moving iron core 23, causing the moving iron core 23 to move towards the stationary iron core 33 until the conductive plate 22 is connected to the conductor 11. At this time, the current can also flow directly from the conductor 11 through the conductive plate 22 to realize the parallel connection of the conductor 11 and the bimetallic element 12.

[0071] Further, refer to Figure 5 The moving iron core assembly also includes an insulating pad 29, which is connected to the moving iron core 23 and is used to limit the position of the conductive plate 22.

[0072] Specifically: the insulating pad 29 is connected to the top of the moving iron core 23 to fix the conductive plate 22 and the moving iron core 23 from the top, thereby limiting the conductive plate 22 from above through the insulating pad 29.

[0073] In an optional implementation of this embodiment, refer to Figure 4 The moving iron core mechanism 2 also includes a striking component, which is connected to the end of the moving iron core 23 away from the compression spring 24, and the striking component is slidably connected to the upper mounting base 21.

[0074] Specifically: the striking component is connected to the end of the moving iron core 23 away from the compression spring 24, and the striking component is slidably connected to the upper mounting base 21; in use, the moving iron core 23 moves toward the stationary iron core 33 due to magnetic force, and during this movement, it drives the output end of the striking component to move horizontally, so as to realize the function of striking and gradually impacting the external traction rod during the movement of the moving iron core 23.

[0075] Further, refer to Figure 4 or Figure 6 The striking assembly includes a striking element 25, a transmission element 26, a rotating shaft 27, and a linkage shaft 28. The striking element 25 is slidably connected to the upper mounting base 21. The transmission element 26 is rotatably connected to the upper mounting base 21 via the rotating shaft 27, and one end of the transmission element 26 is connected to the moving iron core 23 via the linkage shaft 28, while the other end is connected to the striking element 25. The moving iron core assembly is used to drive the striking element 25 to move via the transmission element 26.

[0076] Specifically: The top of the moving iron core 23 is rotatably connected to one end of the transmission component 26 via a linkage shaft 28, and the transmission component 26 is rotatably connected to the upper mounting base 21 via a rotating shaft 27. A sliding groove is provided on the upper mounting base 21, and the end of the rotating shaft 27 is slidably disposed in this sliding groove, thereby realizing that when one end of the transmission component 26 is pulled downward by the moving iron core 23, the rotating shaft 27 slides in the sliding groove. The other end of the transmission component 26 is provided with an insert plate structure, and the insert plate tilts up and moves along the extension direction of the sliding groove during the downward movement of the moving iron core 23. Correspondingly, the striking component 25 is provided with an insertion groove, and the insert plate is inserted into the insertion groove. Moving the insert plate drives the striking component 25 to move. The other end of the striking component 25 is provided with two striking parts, which are used to strike the traction rod. Sliding strips are provided on both sides of the striking component 25 for sliding in the upper mounting base 21, so that the striking component 25 slides more smoothly during the sliding process.

[0077] In an optional implementation of this embodiment, refer to Figure 2 and Figure 3The magnetic yoke mechanism 3 also includes an insulating sleeve 31, a magnetic yoke body 32, and a magnetic yoke plate 34. The insulating sleeve 31 is connected to the magnetic yoke body 32 and is located in the space where the coil conductive element 14 is wound. One end of the stationary iron core 33 is connected to the magnetic yoke body 32, and the other end is inserted into the insulating sleeve 31. The moving iron core 23 and the compression spring 24 are both inserted into the insulating sleeve 31, and the moving iron core 23 is connected to the stationary iron core 33 through the compression spring 24. The magnetic yoke plate 34 is connected to the magnetic yoke body 32 and is connected to the end of the insulating sleeve 31 away from the stationary iron core 33.

[0078] Specifically: the bottom of the stationary iron core 33 is inserted into the bottom insertion hole of the magnetic yoke body 32 for fixation, while the other end of the stationary iron core 33 is inserted into the insulating sleeve 31; the compression spring 24 is placed in the insulating sleeve 31 and connected to the stationary iron core 33, and the bottom of the moving iron core 23 is inserted into the insulating sleeve 31 and the compression spring 24 in sequence, and then the magnetic yoke plate 34 is placed on the top of the magnetic yoke body 32, and the magnetic yoke plate 34 has a hole for the top of the moving iron core 23 to pass through; the moving iron core 23 is preferably a cylindrical structure, and the radius of the cylinder in the middle is relatively large, so that the compression spring 24 and the magnetic yoke plate 34 can limit the bottom and top of the moving iron core 23 respectively.

[0079] It is important to emphasize that, referring to Figure 12 The magnetic trip unit has two functions: first, it pulls the conductive plate 22 to contact the conductive body 11 and conduct electricity, forming a parallel structure with the bimetallic element 12 to produce a current shunting effect; second, it pulls the transmission component 26, which in turn pushes the striking component 25 to release the traction rod, activate the operating mechanism, and disconnect the moving contact 17 and the stationary contact, thus cutting off the circuit.

[0080] Reference Figure 12 The incoming line is connected or disconnected from the stationary contact 17 via the moving contact 17 to achieve the effect of circuit conduction or disconnection.

[0081] When the shunt conductor is connected to the shunt contact, the shunt branch is energized, forming a parallel connection with the bimetallic element 12; when the shunt conductor is disconnected from the shunt contact, the shunt branch is de-energized, and the bimetallic element 12 is in series in the circuit.

[0082] It is then connected to the magnetic trip coil and the output terminal.

[0083] When the magnetic trip coil is in the conducting state, when the electromagnetic attraction generated by the current flowing through it is large enough, it causes the magnetic trip to move, pulling the shunt contact to connect with the shunt conductor, achieving a parallel connection effect. At the same time, the movement of the magnetic trip pushes the operating mechanism to release the trip, and the operating mechanism pushes open the moving contact 17, thus disconnecting the circuit.

[0084] When the electromagnetic attraction generated by the current flowing through it is not strong enough, the magnetic trip unit will not move, and all the current in the circuit will flow through the bimetallic element 12.

[0085] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The above embodiments in this specification are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A thermomagnetic trip unit structure, characterized in that, It includes a conductive mechanism (1), a moving iron core mechanism (2), and a magnetic yoke mechanism (3); The conductive mechanism (1) includes a conductor (11), a bimetallic element (12), a coil conductive element (14), and a flexible conductive element (15), and one end of the conductor (11) is connected to the bimetallic element (12); The moving iron core mechanism (2) is connected to the conductive mechanism (1), and the moving iron core mechanism (2) includes a moving iron core assembly and a conductive plate (22), and the moving iron core assembly is connected to the conductive plate (22); One end of the conductive plate (22) is connected to the bimetallic element (12) through the flexible conductive component (15), and the other end is connected to the coil conductive component (14); The magnetic yoke mechanism (3) is connected to the conductive mechanism (1), and the magnetic yoke mechanism (3) includes a stationary iron core (33), which is distributed relative to the moving iron core assembly; The coil conductive element (14) is wound around the outside of the moving iron core assembly and the stationary iron core (33) and generates a magnetic field after being energized. The moving iron core assembly is used to move towards the stationary iron core (33) under the traction of the magnetic field so that the conductive plate (22) contacts and conducts with the conductor (11) and realizes that the conductor (11) and the bimetallic element (12) are connected in parallel.

2. The thermomagnetic trip unit structure according to claim 1, characterized in that, The conductor (11) includes a first connecting part (111), a supporting part (112), a fixing part (113), and a second connecting part (114). The first connecting part (111) is connected to the fixing part (113) through the supporting part (112), and the first connecting part (111) is used to connect with the conductive plate (22) when the moving iron core assembly is used to move towards the stationary iron core (33) under the traction of a magnetic field. The fixing part (113) is connected to the bimetallic element (12), and one end of the fixing part (113) away from the support part (112) is connected to the second connecting part (114).

3. The thermomagnetic trip unit structure according to claim 2, characterized in that, One end of the bimetallic element (12) is connected to the fixing part (113) by a rivet (121), and the other end of the bimetallic element (12) is provided with a bimetallic adjusting screw (122).

4. The thermomagnetic trip unit structure according to claim 2, characterized in that, The conductive mechanism (1) further includes a lead-out terminal (13), a lower mounting base (16) and a moving contact (17). The lower mounting base (16) is connected to the moving iron core mechanism (2), and the lower mounting base (16) contains the coil conductive element (14) and the magnetic yoke mechanism (3). The output terminal (13) is connected to the end of the coil conductive element (14) away from the conductive plate (22); The moving contact (17) is connected to the second connecting part (114) via a wire.

5. The thermomagnetic trip unit structure according to claim 1, characterized in that, The moving iron core mechanism (2) further includes an upper mounting base (21), which is connected to the conductive mechanism (1), and the moving iron core assembly is housed inside the upper mounting base (21).

6. The thermomagnetic trip unit structure according to claim 5, characterized in that, The moving iron core assembly includes a moving iron core (23) and a compression spring (24). One end of the moving iron core (23) is inserted into the compression spring (24) and together with the compression spring (24), it is disposed in the magnetic yoke mechanism (3). The other end of the moving iron core (23) is connected to the conductive plate (22).

7. The thermomagnetic trip unit structure according to claim 6, characterized in that, The moving iron core assembly also includes an insulating pad (29), which is connected to the moving iron core (23) and is used to limit the position of the conductive plate (22).

8. The thermomagnetic trip unit structure according to claim 6, characterized in that, The moving iron core mechanism (2) further includes a striking component, which is connected to the end of the moving iron core (23) away from the compression spring (24), and the striking component is slidably connected to the upper mounting base (21).

9. The thermomagnetic trip unit structure according to claim 8, characterized in that, The striking assembly includes a striking element (25), a transmission element (26), a rotating shaft (27), and a linkage shaft (28), wherein the striking element (25) is slidably connected to the upper mounting base (21); The transmission component (26) is rotatably connected to the upper mounting base (21) via the rotating shaft (27), and one end of the transmission component (26) is connected to the moving iron core (23) via the linkage shaft (28), and the other end is connected to the striking component (25). The moving iron core assembly is used to drive the striking component (25) to move via the transmission component (26).

10. The thermomagnetic trip unit structure according to any one of claims 6-9, characterized in that, The magnetic yoke mechanism (3) further includes an insulating sleeve (31), a magnetic yoke body (32), and a magnetic yoke plate (34). The insulating sleeve (31) is connected to the magnetic yoke body (32), and the insulating sleeve (31) is located in the space where the coil conductive element (14) is wound. One end of the stationary iron core (33) is connected to the magnetic yoke body (32), and the other end is inserted into the insulating sleeve (31); The moving iron core (23) and the compression spring (24) are both inserted into the insulating sleeve (31), and the moving iron core (23) is connected to the stationary iron core (33) through the compression spring (24); The magnetic yoke plate (34) is connected to the magnetic yoke body (32), and the magnetic yoke plate (34) is connected to the end of the insulating sleeve (31) away from the stationary iron core (33).

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