Magnetic tripping system of circuit breaker
By using a magnetic tripping system linked to the lock in the circuit breaker, the problem of large space occupation of the magnetic tripping system in the existing technology is solved, and space saving and performance improvement of the circuit breaker are achieved.
Patent Information
- Application Number
- CN202420600897.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-26
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-03-26
AI Technical Summary
The existing circuit breaker magnetic tripping system used in DC power systems uses a rigid tripping mechanism, resulting in limited installation position and occupying a large space.
A magnetic tripping system is adopted that connects elastic tripping and locking, including coil bracket, moving iron core, push rod and tripping. The push rod is equipped with tripping parts, and the tripping parts are linked to the locking to achieve jump locking. and save space by vertical placement.
The space saving of the magnetic tripping device is achieved, the installation flexibility and arc extinguishing ability of the circuit breaker are enhanced, and the breaking ability is improved.
Smart Images
Figure CN222260938U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of low-voltage electrical appliances, and specifically relates to a magnetic tripping system of a circuit breaker. Background Art
[0002] With the development of DC power systems such as photovoltaic, energy storage, rail transit, and data centers, the application of switches in DC systems has become more and more extensive. In the prior art, the circuit breakers originally used for AC systems cannot be used in DC systems, or can be used in DC systems after being improved, but the existing circuit breakers for DC systems cannot meet the requirements of fast disconnection and non-polarity of the existing DC power system. Even if there are some double-breakpoint circuit breakers that can be used in DC systems, they adopt a rotary structure, that is, two different moving contacts are installed on the same rotating shaft, and the rotating shaft is rotated to drive the moving contact to contact the static contact during the rotation process, thereby achieving the purpose of double breakpoints. This type of rotary double-breakpoint circuit breaker is large in size and it is difficult to arrange more arc-extinguishing grids, which leads to limited arc-extinguishing ability of the circuit breaker and weak breaking ability. At the same time, the magnetic tripping mechanism of this type of circuit breaker is often rigid tripping, and the release of the tripping lock is achieved by pulling the lock by the electromagnet system, resulting in the installation position of the existing magnetic tripping system being limited and occupying a large space in the shell. Utility Model Content
[0003] The purpose of the utility model is to address the defect that the magnetic tripping mechanism of the circuit breaker used in the DC power system is often a rigid tripping mechanism, and the tripping lock is released by pulling the lock by the electromagnet system, which results in the installation position of the existing magnetic tripping system being limited and occupying a large space in the shell. A magnetic tripping system for a circuit breaker is provided, in which the tripping member adopts an elastic member to be linked with the lock to release the tripping lock, and the magnetic tripping device is placed vertically, saving the internal space of the shell occupied by the magnetic tripping device.
[0004] Technical Solution
[0005] In order to achieve the above technical objectives, the utility model provides a magnetic tripping system for a circuit breaker, characterized in that: the magnetic tripping system includes a coil bracket, the coil is sleeved on the coil bracket, the moving iron core is installed in the inner cavity of the coil bracket, the push rod is installed at the upper end of the moving iron core, the moving iron core is located on the outside of the coil bracket and is connected to a yoke, the coil is connected to a right terminal, and a tripping piece is installed on the push rod, and the tripping piece is linked with the lock to unlock the lock.
[0006] In one embodiment, one end of the yoke is mounted on the lower end of the moving iron core located outside the coil support, and the other end extends to the outside of the coil.
[0007] In one of the embodiments, one end of the release member is fixed to the push rod, and the other end extends to one side of the lock to interact with the lock.
[0008] In one embodiment, one end of the moving iron core located in the inner cavity of the coil bracket is fixedly connected to a moving iron core limiter, and the static iron core is placed in the inner cavity of the coil bracket corresponding to the moving iron core. One end of the moving iron core limiter is fixedly connected to the moving iron core, and the other end passes through the static iron core and extends out of the coil bracket. The iron core spring is mounted on the moving iron core limiter with one end pressing against the moving iron core and the other end pressing against the static iron core.
[0009] In one of the embodiments, the release member includes a frame-shaped push rod linkage portion and a lock unlocking push portion, the frame-shaped push rod linkage portion is placed on the push rod, one side of the frame-shaped push rod linkage portion is bent toward the lock direction to form a lock unlocking push portion for linkage with the lock, and a support portion is provided on one side of the frame-shaped push rod linkage portion.
[0010] In one of the embodiments, a push rod linkage slot is provided on the frame-shaped push rod linkage portion, the push rod is located in the push rod linkage slot and can drive the release member to move through the push rod linkage slot.
[0011] In one embodiment, the release member is installed on the shaft on the housing through the shaft hole on the support portion and can rotate around the shaft.
[0012] In one embodiment, the release member is an elastic release member.
[0013] In one of the embodiments, a right wiring terminal is installed in the housing outside the magnetic tripping system.
[0014] In one embodiment, the push rod and the moving iron core are split or integrated.
[0015] Beneficial Effects
[0016] The utility model provides a magnetic tripping system for a circuit breaker, the magnetic tripping system includes a coil support, a coil is sleeved on the coil support, a moving iron core is installed in the inner cavity of the coil support, a push rod is installed on the upper end of the moving iron core, the lower end of the moving iron core located outside the coil support is connected with a magnetic yoke, the coil is connected to the right terminal, a tripping piece is installed on the push rod, and the tripping piece and the lock buckle are linked to unlock the lock buckle. The tripping piece adopts an elastic piece to link with the lock buckle, so as to realize the release of the tripping lock, and the magnetic tripping device is placed vertically, saving the internal space of the shell occupied by the magnetic tripping device. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.
[0018] Attached Figure 1 It is a structural schematic diagram of a circuit breaker in an open state in an embodiment of the utility model.
[0019] Attached Figure 2 It is a structural schematic diagram of a circuit breaker in a closed state in an embodiment of the utility model.
[0020] Attached Figure 3 It is a schematic diagram of the installation of the magnetic tripping system in the embodiment of the utility model.
[0021] Attached Figure 4 It is a schematic diagram of a magnetic tripping system when the circuit breaker is in an open state in an embodiment of the utility model.
[0022] Attached Figure 5 The release member in the embodiment of the utility model is shown in FIG. Figure 1 .
[0023] Attached Figure 6 The release member in the embodiment of the utility model is shown in FIG. Figure 2 .
[0024] Attached Figure 7 It is a schematic diagram of the internal structure of the magnetic tripping system in the embodiment of the utility model. DETAILED DESCRIPTION
[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0026] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.
[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0028] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0029] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.
[0030] Example
[0031] In the prior art, the magnetic tripping mechanism of the circuit breaker used in the DC power system is often a rigid tripping mechanism, in which the tripping lock is released by pulling the lock by the electromagnet system, resulting in the installation position of the existing magnetic tripping system being limited and occupying a large space in the housing.
[0032] In order to solve the above problems, the attached Figure 3 and 4As shown, this embodiment provides a magnetic tripping system for a circuit breaker, wherein the magnetic tripping system 1 comprises a coil support 101, a coil 102 is mounted on the coil support 101, a moving iron core 103 is mounted in the inner cavity of the coil support 101, and a push rod 104 is mounted on the upper end of the moving iron core 103. The push rod 104 and the moving iron core 103 can be split or integrated. In this embodiment, the push rod 104 and the moving iron core 103 are split. The moving iron core 103 is located outside the coil support 101 and is connected to a yoke 105. The coil 102 is connected to a right wiring terminal 106. A tripping member 107 is mounted on the push rod 104. The tripping member 107 is linked with the lock 2 to unlock the lock 2. A right wiring terminal 106 is mounted outside the magnetic tripping system 1 in the housing 3.
[0033] Specifically, one end of the yoke 105 is mounted on the lower end of the moving iron core 103 outside the coil support 101, and the other end extends to the outside of the coil 102. One end of the release member 107 is fixed to the push rod 104, and the other end extends to one side of the lock 2 to be linked with the lock 2. Figure 7 As shown, one end of the moving iron core 103 located in the inner cavity of the coil support 101 is fixedly connected to a moving iron core limiter 108, and a static iron core 109 is placed in the inner cavity of the coil support 101 corresponding to the moving iron core 103. One end of the moving iron core limiter 108 is fixedly connected to the moving iron core 103, and the other end passes through the static iron core 109 and extends out of the coil support 101. The iron core spring 110 is sleeved on the moving iron core limiter 108, with one end abutting against the moving iron core 103 and the other end abutting against the static iron core 109. A limit platform 108a is provided on the end of the moving iron core limiter 108 extending out of the coil support 101 to limit the movement stroke of the moving iron core limiter 108. In this embodiment, the release member 107 is an elastic release member. As shown in the attached figure Figure 5 and 6 As shown, the release member 107 includes a frame-shaped push rod linkage portion 107a and a lock unlocking push portion 107b. The frame-shaped push rod linkage portion 107a is placed on the push rod 104. The frame-shaped push rod linkage portion 107a is provided with a push rod linkage slot 107a01. The push rod 104 is located in the push rod linkage slot 107a01 and can drive the release member 107 to move through the push rod linkage slot 107a01. One side of the frame-shaped push rod linkage portion 107a is bent toward the lock buckle 2 to form a lock unlocking push portion 107b for linkage with the lock buckle 2. A support portion 107c is provided on one side of the frame-shaped push rod linkage portion 107a. The release member 107 is installed on the shaft 301 on the housing 3 through the shaft hole 107c01 on the support portion 107c and can rotate around the shaft 301.
[0034] As attached Figure 2As shown, in the power-on state, the coil induces a magnetic field, and the moving iron core 103 moves downward under the action of the magnetic field, driving the push rod 104 to move downward, thereby driving the tripping member 107 to release the lock 2, so that the circuit breaker is tripped and opened as shown in the attached figure. Figure 1 and 4 shown.
[0035] The working principle of the above circuit breaker is as follows: when a normal current flows through the circuit, the circuit breaker is in a closed state, the lock catch 2 and the trip catch 5 are locked together, and the reaction spring 6 cannot push the rotating shaft 7 to rotate, thereby avoiding the circuit from being closed by mistake; when the circuit breaker needs to be manually opened, the rotation of the operating handle 8 drives the upper connecting rod 9 to move, and the upper connecting rod 9, the trip catch 5, the lock catch 2 and the rotating shaft 7 form a connecting rod mechanism, so the movement of the upper connecting rod 9 drives the rotating shaft 7 to rotate, thereby driving the disconnection of the double-breakpoint moving contact system a and the double-breakpoint static contact system b to realize the circuit breaker opening as shown in the attached figure. Figure 1 As shown,.
[0036] When a small overload current appears in the circuit, the bimetallic strip 401 in the thermal tripping system 4 is deformed by heat and hits the tripping rod 201, and the lock buckle 2 rotates to release the lock of the tripping buckle 5; when a large instantaneous current appears in the circuit, the magnetic tripping system 1 is energized, and the tripping member 107 pushes the lock buckle 2 to rotate to release the lock of the tripping buckle 5. When a fault abnormal current appears in these two circuits, the lock of the tripping buckle is released, and the rotating shaft 7 can rotate under the action of the reaction spring 6 to drive the disconnection of the double-breakpoint moving contact system a and the corresponding double-breakpoint static contact system b.
[0037] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0038] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.
Claims
1. A magnetic tripping system for a circuit breaker, characterized in that: The magnetic tripping system (1) comprises a coil support (101), a coil (102) is mounted on the coil support (101), a moving iron core (103) is mounted in an inner cavity of the coil support (101), a push rod (104) is mounted on the upper end of the moving iron core (103), the moving iron core (103) is located outside the coil support (101) and is connected to a yoke (105), the coil (102) is connected to a right terminal (106), a tripping member (107) is mounted on the push rod (104), and the tripping member (107) is linked with the lock (2) to unlock the lock (2).
2. A magnetic tripping system for a circuit breaker according to claim 1, characterized in that: One end of the magnetic yoke (105) is mounted on the lower end of the moving iron core (103) located outside the coil support (101), and the other end extends to the outside of the coil (102).
3. A magnetic tripping system for a circuit breaker according to claim 1, characterized in that: One end of the release member (107) is fixed on the push rod (104), and the other end extends to one side of the lock buckle (2) to be linked with the lock buckle (2).
4. A magnetic tripping system for a circuit breaker according to claim 1, characterized in that: One end of the moving iron core (103) located in the inner cavity of the coil support (101) is fixedly connected to a moving iron core stopper (108); a stationary iron core (109) is placed in the inner cavity of the coil support (101) and corresponds to the moving iron core (103); one end of the moving iron core stopper (108) is fixedly connected to the moving iron core (103), and the other end passes through the stationary iron core (109) and extends out of the coil support (101); an iron core spring (110) is sleeved on the moving iron core stopper (108), with one end abutting against the moving iron core (103) and the other end abutting against the stationary iron core (109).
5. A magnetic tripping system for a circuit breaker according to claim 1 or 3, characterized in that: The release member (107) comprises a frame-shaped push rod linkage portion (107a) and a lock unlocking push portion (107b); the frame-shaped push rod linkage portion (107a) is placed on the push rod (104); one side of the frame-shaped push rod linkage portion (107a) is bent toward the lock (2) to form a lock unlocking push portion (107b) for linkage with the lock (2); and a support portion (107c) is provided on one side of the frame-shaped push rod linkage portion (107a).
6. A magnetic tripping system for a circuit breaker as claimed in claim 5, characterized in that: The frame-shaped push rod linkage portion (107a) is provided with a push rod linkage slot (107a01), the push rod (104) is located in the push rod linkage slot (107a01) and can drive the release member (107) to move through the push rod linkage slot (107a01).
7. A magnetic tripping system for a circuit breaker according to claim 6, characterized in that: The release member (107) is mounted on the shaft (301) on the housing (3) through the shaft hole (107c01) on the support portion (107c) and can rotate around the shaft (301).
8. A magnetic tripping system for a circuit breaker according to claim 1 or 3, characterized in that: The release member (107) is an elastic release member.
9. A magnetic tripping system for a circuit breaker according to claim 1, characterized in that: A right wiring terminal (106) is installed inside the housing (3) and outside the magnetic tripping system (1).
10. The magnetic tripping system of a circuit breaker according to claim 1, characterized in that: The push rod (104) and the moving iron core (103) are of separate type or integrated type.