CN-121983471-A - Parallel contact system for magnetic latching relay and magnetic latching relay

Abstract

The invention discloses a parallel contact system for a magnetic latching relay and the magnetic latching relay, and belongs to the technical field of electrical switches. The contact system comprises a base and a pair of contact assemblies arranged in parallel, wherein each contact assembly comprises a zigzag structure formed by a bus bar, a movable reed assembly and a fixed contact. The two movable reed components are parallel and electrically connected in parallel. The relay comprises the contact system, a coil assembly, a magnetic steel assembly and a pushing rod. The invention realizes current diversion and contact resistance reduction by parallel connection of the double-zigzag structure, and remarkably improves the current carrying capacity, the high-current impact resistance and the reliability of the relay by utilizing electromagnetic attraction and repulsion between parallel conductors and between the conductors and the bus bar, and is beneficial to reducing the volume of products.

Inventors

• YIN BINGYIN
• HUANG CHENGYOU
• LI ZHIMING
• CHEN YUXUAN

Assignees

• 长沙中坤电子科技有限责任公司

Dates

Publication Date

20260505

Application Date

20260129

Claims (9)

1. 1. A parallel contact system for a magnetic latching relay comprising a base (2) and a pair of parallel arranged contact assemblies mounted on said base, characterized in that: A pair of said contact assemblies comprising a first "zig-zag" busbar assembly (1) and a second "zig-zag" busbar assembly (7); each zigzag bus bar component comprises a bus bar (1-3), a movable reed component (1-1) connected with one end of the bus bar, and a stationary contact (1-2) connected with the same end of the bus bar; The movable reed component of the first zigzag bus bar component (1) and the movable reed component of the second zigzag bus bar component (7) are parallel and electrically connected in parallel.
2. 2. Parallel contact system for a magnetic latching relay according to claim 1, characterized in that the movable spring assembly (1-1) comprises one or more movable springs, on which one, two or more movable contacts (1-1-1) are provided.
3. 3. Parallel contact system for a magnetic latching relay according to claim 2, characterized in that when the movable contact spring assembly (1-1) is provided with two movable contacts (1-1-1), the movable contact spring carrying the movable contact is provided with a slot between the two movable contacts.
4. 4. Parallel contact system for a magnetic latching relay according to claim 1, characterized in that the movable reed assembly (1-1), the stationary contact (1-2) and the bus bar (1-3) form a "zig-zag" structure by riveting or welding.
5. 5. Parallel contact system for a magnetic latching relay according to claim 4, characterized in that the tail of the first "zig-zag" busbar assembly (1) and the second "zig-zag" busbar assembly (7) are connected in parallel by integral riveting or separate riveting.
6. 6. The parallel contact system for a magnetic latching relay of claim 1 wherein the shape of the "zig-zag" structure is configured such that when current flows, a section between the parallel movable reed assemblies creates a co-current and a section between the movable reed assemblies and the corresponding bus bar creates a counter-current.
7. 7. A magnetic latching relay comprising a coil assembly (6), a magnetic steel assembly (4), a push rod driven by the magnetic steel assembly, and a parallel contact system for a magnetic latching relay as claimed in any one of claims 1to 6; The magnetic steel assembly (4) comprises a left arm (4-1) and a right arm (4-2), and the pushing rods comprise a first pushing rod (3) and a second pushing rod (8) which are respectively connected with the left arm and the right arm.
8. 8. The magnetic latching relay according to claim 7, further comprising a mounting bracket (5) and an upper cover (9) for receiving the coil assembly (6), the magnetic steel assembly (4) and the contact system.
9. 9. The magnetic latching relay of claim 7, wherein the relay is configured to withstand short-term high current surges of no less than 4.5 kA.

Description

Parallel contact system for magnetic latching relay and magnetic latching relay Technical Field The invention relates to the technical field of electric switches, in particular to an improved structure of a relay contact system, and especially relates to a parallel contact system for a magnetic latching relay and the magnetic latching relay comprising the same. Background The magnetic latching relay is widely applied to the fields of intelligent electric meters, new energy and the like because of low power consumption and stable state. In these applications, the relay is often subjected to large load currents and short-time high current (e.g., short-circuit current) surges. Therefore, improving the load carrying capacity and the impact resistance of the relay and reducing the working temperature rise of the relay are important points of the current technical development. In the prior art, in order to improve the high-current impact resistance, a scheme is to adopt a single-group busbar and movable reed assembly in a zigzag structure. When a large current flows, the electromotive force (lorentz force) generated by the current at the corners of the zigzag structure helps to press the movable and stationary contacts more tightly, and prevents repulsion. However, the contact resistance is relatively large, the temperature rise is high, and the movable reed is often required to be widened to meet the requirement of large current carrying, so that the overall thickness of the relay is increased. The other scheme is that a simple movable reed parallel structure is adopted, current can be split, but the effect of improving the electric power impact resistance is limited. Therefore, a novel contact system structure is needed, and the current carrying, impact resistance and heat dissipation performance of the relay can be comprehensively improved on the premise of not remarkably increasing the volume of the product. Disclosure of Invention The invention aims to overcome the defects of the prior art and provides a parallel contact system for a magnetic latching relay and the magnetic latching relay. The structure can effectively improve the load of the product and the capability of resisting heavy current impact, and reduce the contact resistance and the temperature rise of a loop. In order to achieve the above purpose, the invention adopts the following technical scheme: A parallel contact system for a magnetic latching relay includes a base and a pair of parallel disposed contact assemblies mounted on the base. The pair of contact assemblies comprises a first zigzag bus bar assembly and a second zigzag bus bar assembly, each zigzag bus bar assembly comprises a bus bar, a movable reed assembly connected to one end of the bus bar and a stationary contact connected to the same end of the bus bar, and the movable reed assemblies of the first zigzag bus bar assembly and the movable reed assemblies of the second zigzag bus bar assembly are parallel to each other and electrically connected in parallel. The magnetic latching relay comprises a coil assembly, a magnetic steel assembly, a push rod driven by the magnetic steel assembly and the parallel contact system for the magnetic latching relay, wherein the magnetic steel assembly comprises a left arm and a right arm, and the push rod comprises a first push rod and a second push rod which are respectively connected with the left arm and the right arm. Compared with the prior art, the invention has the following remarkable advantages: (1) The load capacity is improved by adopting the parallel connection of the double-group zigzag bus bar components, and the current is naturally split in the two groups of movable reed components when flowing, so that the whole contact system can bear larger load current, and the load capacity of the product is improved. (2) The current path forms a multi-section parallel conductor after the double zigzag structures are connected in parallel. According to the principle of 'same-direction current attraction and opposite-direction current repulsion' among parallel conductors (namely ampere force law, the force is proportional to the product of current and inversely proportional to the distance), electric attraction force and electric repulsion force are generated between movable reed assemblies and between the movable reed assemblies and respective bus bars. The combined action of the forces can effectively inhibit the negative influence of huge electrodynamic force generated when large current (such as 4.5kA and above) passes through on the contact pressure, obviously reduce the shake of a movable reed assembly, ensure that a movable contact and a static contact can still be reliably contacted under the impact of the large current, and greatly improve the impact resistance and the reliability of products. (3) The contact resistance and the temperature rise are reduced, namely, the contact resistance between the movable contact and the static co