Contact system of an automatic transfer switching device

Abstract

The present application relates to a kind of contact systems of automatic transfer switchgear, a plurality of contact cavities are formed in shell, arc separation plate is arranged between static contact in contact cavity, arc separation plate outer end is hinged on shell, and inner end extends to the outer peripheral surface of rotating disc towards the center of rotating disc, arc separation plate is provided with elastic member, and arc separation plate is kept at the position of inner end pointing to the center of rotating disc, the present application uses movable arc separation plate to be arranged between two static contacts, when static contact and static contact are disconnected, arc separation plate can isolate the arc generated on two static contacts, prevent arc, after breaking, when dynamic contact rotates with rotating disc, dynamic contact can overcome the tension of tension spring and push away arc separation plate, let dynamic contact rotate to another static contact and close, arc separation plate not only can prevent arc, but also can let dynamic contact pass smoothly.

Description

Technical Field

[0001] This invention relates to a component of an automatic transfer switch, and more particularly to a contact system of an automatic transfer 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] When the contact system of an automatic transfer switch is disconnected, arcing will occur. The current practice is to place the moving contacts that connect the two sets of power supplies in two separate chambers to prevent arcing. However, such moving contacts also need to be connected to the load end by a flexible wire. The moving contact group consisting of two contacts and a flexible wire has high material costs, and the welding of the flexible wire is not easy to automate, making it unsuitable for production on automated production lines. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a contact system for an automatic transfer switch that has a simple structure and can prevent arcing between contacts.

[0005] To achieve the above objectives, the present invention employs a contact system for an automatic transfer switch, comprising a housing, a moving contact assembly, and stationary contacts. Multiple contact cavities are formed within the housing, and a main shaft passes through these cavities. Each contact cavity contains a moving contact assembly and a stationary contact. The moving contact assembly is mounted on the main shaft and rotates synchronously with it. Three stationary contacts are equidistantly arranged around the moving contact assembly. The moving contact assembly includes a moving contact and a turntable. The moving contact is located within the turntable and extends towards two of the stationary contacts. An arc-blocking plate is provided between the stationary contacts within the contact cavity. The outer end of the arc-blocking plate is hinged to the housing, and its inner end extends towards the center of the turntable onto the outer circumference of the turntable. An elastic element is provided on the arc-blocking plate to hold it in a position where its inner end points towards the center of the turntable.

[0006] The beneficial effects of this invention are that a movable arc-isolating plate is set between two stationary contacts. When the moving contact is separated from the stationary contact, the arc-isolating plate can isolate the electric arc generated on the two stationary contacts and prevent arc crossing. After separation, when the moving contact rotates with the turntable, the moving contact can overcome the tension of the tension spring and push the arc-isolating plate away, allowing the moving contact to rotate to another stationary contact and close with it. The distance setting of the moving contacts on the turntable can ensure that both ends of the moving contact can always be connected to two of the stationary contacts at the same time, ensuring that the power supply is connected. Compared with the original contact system where only one of the two moving contacts is connected to a stationary contact of one power supply, the utilization rate of the moving contacts is higher, the pressure at both ends of the moving contacts is more balanced, and the additional wires connecting the load end are eliminated, saving costs.

[0007] The invention is further configured such that a crank arm is connected to the arc-blocking plate, and the elastic element is a tension spring, with one end of the tension spring connected to the top of the crank arm and the other end connected to the outer shell of the turntable. The tension spring connected to the crank arm provides tension to ensure that the inner end of the arc-blocking plate always points to the center of the turntable when there is no moving contact pushing it.

[0008] The present invention further comprises three stationary contacts: a regular stationary contact, a spare stationary contact, and a load stationary contact. An arc-blocking plate is disposed between the regular stationary contact and the load stationary contact, and between the spare stationary contact and the load stationary contact. The moving contacts only move between the regular stationary contact and the load stationary contact, and between the spare stationary contact and the load stationary contact; therefore, only the arc-blocking plate needs to be disposed between these stationary contacts.

[0009] The invention further comprises a baffle formed on the housing between the commonly used stationary contact and the spare stationary contact, with the front end of the baffle tightly abutting the outer peripheral wall of the turntable. Since the moving contact does not need to pass between the commonly used stationary contact and the spare stationary contact, using a fixed baffle for arc isolation is more convenient and reliable.

[0010] The invention is further configured such that a square shaft is provided inside the housing, penetrating all contact cavities. The outer end of the arc-blocking plate is sleeved on the square shaft, and crank arms are connected to both ends of the square shaft, with the crank arms located inside the housing outside the contact cavities. The arc-blocking plate moves coaxially and synchronously, and the crank arms at both ends provide tension simultaneously for a more balanced effect.

[0011] The invention is further configured such that tension spring brackets are provided at both ends of the housing, and the other end of the tension spring connected to the crank arm is connected to the tension spring bracket. Using tension spring brackets to connect the inner end of the tension spring facilitates assembly. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of a specific embodiment of the present invention.

[0013] Figure 2 This is a cross-sectional view of a specific embodiment of the present invention.

[0014] Figure 3 This is a schematic diagram of a specific embodiment of the present invention with the outer shell removed. Detailed Implementation

[0015] like Figures 1-3As shown, a specific embodiment of the present invention is a contact system for an automatic transfer switch, including a housing 1, a moving contact assembly 2, and stationary contacts 3. Multiple contact cavities 11 are formed within the housing 1. A main shaft 4 is disposed within the housing 1, passing through the multiple contact cavities 11. Each contact cavity 11 contains a moving contact assembly 2 and a stationary contact 3. The moving contact assembly 2 is mounted on the main shaft 4 and rotates synchronously with the main shaft 4. Three stationary contacts 3 are equidistantly arranged around the moving contact assembly 2. The three stationary contacts 3 are a commonly used stationary contact 31, a spare stationary contact 32, and a load stationary contact 33. The moving contact assembly 2 includes a moving contact 21 and a turntable 22. The moving contact 21 is disposed within the turntable 22, with both ends of the moving contact 21 extending towards two of the stationary contacts 3. The distance between the two ends of the moving contact 21 is designed to ensure that both ends of the moving contact 21 can simultaneously connect with two of the stationary contacts 3. The commonly used stationary contact 31 and the load stationary contact 33 within the contact cavity 11... An arc-blocking plate 5 is provided between the spare stationary contact 32 and the load stationary contact 33. A square shaft 51 is provided on the outer end of the housing 1 of the arc-blocking plate 5. The square shaft 51 passes through all the contact cavities 11. The outer end of the arc-blocking plate 5 is sleeved on the square shaft 51 and rotates synchronously with the square shaft 51. The inner end of the arc-blocking plate 5 extends towards the center of the turntable 22 and extends to the outer circumferential surface of the turntable 22. The two ends of the square shaft 51 are connected to the crank arms 52. The crank arms 52 are set in the housing 1 outside the contact cavity 11. The two ends of the housing 1 are provided with tension spring brackets 12 corresponding to the crank arms 52. A tension spring 53 is connected between the top of the crank arm 52 and the tension spring bracket 12. The tension spring 53 connected to the crank arm 52 provides tension to ensure that the inner end of the arc-blocking plate 5 always points to the center of the turntable 22 when there is no moving contact 21 pushing it. A baffle 13 is formed on the housing 1 between the commonly used stationary contact 31 and the spare stationary contact 32. The front end of the baffle 13 forms an arc surface that is tightly attached to the outer circumferential surface of the turntable 22.

[0016] The present invention employs a movable arc-blocking plate 5 positioned between two stationary contacts 3. When the moving contact 21 is separated from the stationary contact 3, the arc-blocking plate 5 can isolate the electric arc generated on the two stationary contacts 3 to prevent arc crosstalk. After separation, when the moving contact 21 rotates with the turntable 22, the moving contact 21 can overcome the tension of the tension spring 53 to push away the arc-blocking plate 5, allowing the moving contact 21 to smoothly rotate to the other stationary contact 3 and close with it.

[0017] This invention is not limited to the specific embodiments described and shown herein, and other modifications and variations can be made by those skilled in the art without departing from the spirit and scope of the invention. All such modifications and variations fall within the scope of this invention. Moreover, all components described herein can be replaced by other technically equivalent components.

Claims

1. A contact system of an automatic transfer switch, comprising a housing, a moving contact assembly, and static contacts, a plurality of contact cavities are formed in the housing, a main shaft is arranged in the housing and penetrates through the plurality of contact cavities, the moving contact assembly and the static contacts are arranged in each contact cavity, the moving contact assembly is arranged on the main shaft and rotates synchronously with the main shaft, and three static contacts are equidistantly arranged around the moving contact assembly, characterized in that: The moving contact assembly comprises a moving contact, a rotating disc, the moving contact is arranged in the rotating disc, the moving contact extends to two static contacts, an arc separation plate is arranged between the static contacts in the contact cavity, the outer end of the arc separation plate is hinged on the shell, the inner end extends to the outer peripheral surface of the rotating disc towards the center of the rotating disc, an elastic element is arranged on the arc separation plate to keep the arc separation plate in the position with the inner end pointing to the center of the rotating disc.

2. The contact system of an automatic transfer switching apparatus according to claim 1, characterized in that: The arc separation plate is connected with a crank arm, the elastic element is a tension spring, one end of the tension spring is connected with the top end of the crank arm, and the other end of the tension spring is connected with the shell outside the rotating disc.

3. Contact system of an automatic transfer switch according to claim 1 or 2, characterized in that: The static contacts are divided into normal static contacts, standby static contacts and load static contacts, the arc separation plates are arranged between the normal static contacts and the load static contacts, the standby static contacts and the load static contacts.

4. The contact system of an automatic transfer switching apparatus according to claim 3, characterized in that: A baffle is formed on the shell between the normal static contacts and the standby static contacts, and the front end of the baffle is close to the outer peripheral wall of the rotating disc.

5. The contact system of an automatic transfer switching apparatus according to claim 2, characterized in that: A square shaft is arranged in the shell, the square shaft penetrates all the contact cavities, the outer end of the arc separation plate is sleeved on the square shaft, the crank arms are connected with the two ends of the square shaft, and the crank arms are arranged in the shell outside the contact cavities.

6. The contact system of an automatic transfer switching apparatus according to claim 5, characterized in that: Tension spring supports are arranged at the two ends of the shell, and the other ends of the tension springs connected with the crank arms are connected with the tension spring supports.

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