Contact system of a changeover switch

Abstract

The application relates to a contact system of a change-over switch, comprising a moving contact assembly, a load static contact and a power static contact, the moving contact assembly is arranged to rotate between the load static contact and the power static contact, the moving contact assembly comprises a moving contact and a contact support, the moving contact is arranged in the contact support, a flexible connection is arranged on the load static contact and connected with the moving contact, the moving contact is connected with the static contact through the flexible connection, so that the moving contact and the load static contact can be separated without pulling arc, and short circuit caused by arc throwing is prevented.

Description

Technical Field

[0001] This invention relates to an assembly of a changeover switch, and more particularly to a contact system of a changeover switch. Background Technology

[0002] Automatic transfer switches are mainly used in two-way neutral-grounded power supply systems to switch between power sources in case of an anomaly in one power source, ensuring the reliability and safety of the power supply. Automatic transfer switches typically include an operating mechanism and a contact system, with the operating mechanism controlling the contact system to switch between two power sources.

[0003] Existing changeover switches use a rotating shaft to control the rotation of the moving contact in the contact system to switch between two power sources. When the moving contact breaks with the stationary contact, an arc is generated. To prevent short circuits caused by this arcing, the contact system needs a certain arc-extinguishing capability to improve the lifespan of the changeover switch. However, some small changeover switches, due to limited space, have traditional double-break switches with small opening distances that cannot break the arc. If the arc is not broken during the switching process, closing the circuit with another power source could lead to a short circuit and explosion. Single-break snap-fit ​​contact systems are expensive and do not meet the standards for short-time withstand and short-circuit connection. Summary of the Invention

[0004] To address the aforementioned shortcomings, this invention provides a contact system for a changeover switch that exhibits less arcing and a longer service life, meeting the requirements for short-circuit performance and making / breaking capacity within a small housing.

[0005] To achieve the above objectives, the present invention employs a contact system for a changeover switch, comprising a moving contact assembly, a load stationary contact, and a power stationary contact. The moving contact assembly is rotatably disposed between the load stationary contact and the power stationary contact. The moving contact assembly includes a moving contact and a contact support. The moving contact passes through the contact support. The load stationary contact is provided with a flexible connection that connects to the moving contact.

[0006] When the moving contact assembly is disconnected from the load stationary contact and the power supply stationary contact, the present invention can maintain the connection with the load stationary contact through a soft connection, so that no electric arc is generated between the load stationary contact and the moving contact.

[0007] Preferably, there are two power stationary contacts, which are disposed on one side of the moving contact assembly. The inner side of the load stationary contact forms a base, which extends to both sides and forms two contact ends at the top. The two contact ends correspond to the tops of the two power stationary contacts. The moving contact assembly uses two paired clamping moving contacts. There are two flexible connections, the outer ends of which are connected to both sides of the base of the load stationary contact, and the inner ends of which are connected to the two moving contacts.

[0008] The above technical solution connects a flexible connector between the base of the load stationary contact and the moving contact. When the moving contact breaks, the arc between the contact end and the moving contact is transferred to the flexible connector. Since there is a distance between the base and the contact end, there will be a voltage difference between the contact end and the moving contact for a certain period of time during the transfer process. This reduces the voltage difference between the power supply stationary contact and the moving contact, reduces the arc generated between the power supply stationary contact and the moving contact, ensures that the arc between the power supply stationary contact and the moving contact can be quickly broken, and improves short-circuit performance and connection and breaking capacity.

[0009] Preferably, the moving contact assembly further includes a contact spring support and a contact spring. The contact spring support is located at the center of the contact support, and two moving contacts are inserted into the contact spring support. The centers of the two moving contacts form relatively protruding protrusions. The contact spring is located between one of the moving contacts and the contact spring support. Both moving contacts are connected by flexible connections.

[0010] Preferably, two through moving contact slots are formed on the contact support, and two moving contacts are respectively disposed in the two moving contact slots. One side of each of the two moving contact slots forms a fan-shaped opening facing the load stationary contact, and two flexible connectors pass through the fan-shaped openings formed by the two moving contact slots respectively.

[0011] Preferably, the contact system further includes a base, the contact support is embedded in the base and rotates, and the base is provided with an arc-extinguishing cover between the moving contact and the stationary power contact.

[0012] Preferably, a positioning protrusion is formed inward from the center of the contact spring bracket, and one section of the contact spring is fitted over the positioning protrusion for fixation.

[0013] The beneficial effects of this invention are that the moving contact is connected to the stationary contact via a flexible connection, which ensures that no arcing occurs when the moving contact is separated from the load stationary contact, thus preventing short circuits caused by arcing; a spring is installed inside the contact spring bracket to press the two moving contacts together, and the spring evenly transmits the pressure to both moving contacts, ensuring that the pressure on both sides is equal when the moving contact holds the stationary contact. Attached Figure Description

[0014] Fig. 1 This is a front view of a specific embodiment of the present invention.

[0015] Fig. 2 This is a schematic diagram of a specific embodiment of the present invention.

[0016] Fig. 3 This is a schematic diagram of the moving contact assembly according to a specific embodiment of the present invention.

[0017] Fig. 4 This is a cross-sectional view of the moving contact assembly according to a specific embodiment of the present invention. Detailed Implementation

[0018] like Figs. 1-4 As shown, a specific embodiment of the present invention is a contact system for a changeover switch, including a moving contact assembly 1, a load stationary contact 2, a power stationary contact 3, and a base 4. The moving contact assembly 1 is rotatable between the load stationary contact 2 and the power stationary contact 3. There are two power stationary contacts 3, which are located on one side of the moving contact assembly 1. A base 22 is formed on the inner side of the load stationary contact 2, and the base 22 extends to both sides and forms two contact ends 21 at the top. The two contact ends 21 correspond to the top ends of the two power stationary contacts 3. When the moving contact assembly 1 rotates, it simultaneously contacts one power stationary contact 3 and one contact end 21 of the load stationary contact 2. The moving contact assembly 1 includes a moving contact 11, a contact support 12, a contact spring support 13, and a contact spring 14. The moving contact 11 is inserted into the contact support 12. A flexible connection 5 is provided on the load stationary contact 2 and connected to the moving contact 11. The contact support 12 is embedded in the base 4 and rotates. The base 4 is located between the moving contact 11 and the power stationary contact 2. An arc-extinguishing cover 6 is provided between the heads 3. A contact spring support 13 is located at the center of the contact support 12. Two moving contacts 11 pass through the contact spring support 13. The centers of the two moving contacts 11 form relatively protruding protrusions 111. A contact spring 14 is located between one of the moving contacts 11 and the contact spring support 13. Flexible connectors 5 are respectively connected to the two moving contacts 11. The outer ends of the flexible connectors 5 are respectively connected to the base 22 of the load stationary contact 2. Two through-type connections are formed on the contact support 12. The moving contact groove 121 is through which two moving contacts 11 are respectively installed. One side of each of the two moving contact grooves 121 forms a fan-shaped opening 122 facing the load stationary contact 2. The angle of the fan-shaped opening 122 is 90 degrees. Two flexible connectors 5 pass through the fan-shaped openings 122 formed by the two moving contact grooves 121 respectively. The center of the contact spring bracket 13 forms a positioning protrusion 131 inward. One part of the contact spring 14 is fixed by being sleeved on the positioning protrusion 131.

[0019] In this specific embodiment, the flexible connection 5 uses a copper wire, preferably with a diameter of 1 mm.

[0020] The preferred embodiments of the present invention described in the above specific embodiments are also included. Other obvious variations or combinations are also within the scope of protection of the claims.

Claims

1. A contact system for a changeover switch, comprising a moving contact assembly, a load stationary contact, and a power supply stationary contact, wherein the moving contact assembly is rotatable between the load stationary contact and the power supply stationary contact, characterized in that: The moving contact assembly includes a moving contact and a contact support. The moving contact is housed within the contact support, and the load stationary contact is provided with a flexible connection that connects to the moving contact.

2. The contact system of the changeover switch according to claim 1, characterized in that: There are two stationary power contacts, which are disposed on one side of the moving contact assembly. The inner side of the load stationary contact forms a base, which extends to both sides and forms two contact ends at the top. The two contact ends correspond to the tops of the two stationary power contacts. The moving contact assembly uses two paired clamping moving contacts. There are two flexible connections, the outer ends of which are connected to both sides of the base of the load stationary contact, and the inner ends of which are connected to the two moving contacts.

3. The contact system of the changeover switch according to claim 2, characterized in that: The moving contact assembly also includes a contact spring bracket and a contact spring. The contact spring bracket is located at the center of the contact bracket. Two moving contacts are inserted into the contact spring bracket. The centers of the two moving contacts form relatively protruding protrusions. The contact spring is located between one of the moving contacts and the contact spring bracket. Both moving contacts are connected by flexible connections.

4. The contact system of the changeover switch according to claim 3, characterized in that: Two through moving contact slots are formed on the contact support. Two moving contacts are respectively installed through the two moving contact slots. One side of each of the two moving contact slots forms a fan-shaped opening facing the load stationary contact. Two flexible connectors pass through the fan-shaped openings formed by the two moving contact slots.

5. The contact system of the changeover switch according to claim 2, characterized in that: The contact system also includes a base, the contact support is embedded in the base and rotates, and the base is provided with an arc-extinguishing cover between the moving contact and the power stationary contact.

6. The contact system of the changeover switch according to claim 4 or 5, characterized in that: The center of the contact spring bracket forms a positioning protrusion, and one end of the contact spring is fitted over the positioning protrusion for fixation.

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