A contact system for a dual power automatic transfer switch

Abstract

The present invention relates to a contact system of a dual power automatic transfer switch, comprising a housing, a contact assembly arranged in the housing, the contact assembly comprising a rotating shaft rotatably arranged in the housing, two moving contact pieces, a load static contact, a common power static contact, and a standby power static contact linked to the rotating shaft, two clamping spaces matching the load static contact, the common power static contact, and the standby power static contact are formed between the two ends of the two moving contact pieces, two arc-isolating plates are arranged in the housing to separate the common power static contact from the load static contact, and the standby power static contact from the load static contact, one end of the two arc-isolating plates has arc-isolating portions respectively inserted in the two clamping spaces of the two moving contact pieces, the two moving contact pieces move with the rotating shaft and slide back and forth on both sides of the arc-isolating portions of the two arc-isolating plates respectively. The present invention has the advantages of simple structure, stable and reliable performance, arc prevention, long service life, and zero arcing.

Description

Technical Field

[0001] The invention relates to a dual power automatic transfer switch, in particular to a contact system of the dual power automatic transfer switch. Background Art

[0002] At present, the dual power automatic transfer switch, as the name implies, automatically connects to the backup power supply through the dual power switch when the power is suddenly cut off, so that our operation will not be interrupted and can continue to operate. The purpose of the dual power automatic transfer switch is to use one power supply for common use and one power supply for backup. When the common power suddenly fails or the power is cut off, the dual power switch is used to automatically switch to the backup power supply so that the equipment can still operate normally. Many industries and departments have very high requirements for the reliability of power supply. In order to ensure the continuity of power supply, many important occasions use dual power automatic transfer switches to power electrical appliances. As an essential device for power switching, the requirements for its technical performance are getting higher and higher.

[0003] The dual power automatic transfer switch includes an automatic transfer mechanism and a contact system. The automatic transfer mechanism controls the contact system to switch between two power sources. When the contact system of the existing dual power automatic transfer switch is disconnected, arcing is easily generated between the common static contact and the spare static contact, and arcing is easily generated between the common static contact and the spare static contact, which greatly affects the service life of the contact system. In addition, the structural design of the existing contact system is relatively complex, the arc extinguishing performance is not ideal, and the purpose of zero arcing cannot be achieved. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a contact system of a dual power automatic transfer switch with simple structure, stable and reliable performance, arc prevention, long service life and zero arcing.

[0005] To achieve the above-mentioned purpose, the present invention adopts a contact system of a dual power automatic transfer switch, including a shell and a contact assembly arranged in the shell, the contact assembly including a rotating shaft rotatably arranged in the shell, two moving contact pieces linked to the rotating shaft, a load static contact, a normal power static contact, and a standby power static contact, two clamping spaces matching the load static contact, the normal power static contact, and the standby power static contact are formed between the two ends of the two moving contact pieces, two arc isolation plates are arranged in the shell to separate the normal power static contact from the load static contact, and the standby power static contact from the load static contact, one end of the two arc isolation plates has arc isolation portions respectively inserted into the two clamping spaces of the two moving contact pieces, and the two moving contact pieces move with the rotating shaft and slide back and forth on both sides of the arc isolation portions of the two arc isolation plates respectively.

[0006] The beneficial effect of the above structure is: the two arc-isolating plates between the static contact of the common power supply and the static contact of the load, and the static contact of the standby power supply and the static contact of the load, so that the two arc-isolating plates can isolate the arcs generated by the static contact of the common power supply and the static contact of the load, and the static contact of the standby power supply and the static contact of the load, prevent the occurrence of arc chain phenomenon, and avoid arc burning of the contact components of the contact system. The arc-isolating parts of the two arc-isolating plates are inserted in the hijacking space of the two moving contacts. During the opening and closing actions of the two moving contact pieces, the arc-isolating parts of the two arc-isolating plates can always isolate the arc, and the anti-arc chain performance is better. Therefore, the contact system has the advantages of simple structure, stable and reliable performance, arc chain prevention, and long service life.

[0007] In particular, arc-shaped convex strips matching the motion trajectories of the two moving contact pieces are respectively arranged on both sides of the arc-isolating parts of the two arc-isolating plates, and the two moving contact pieces move with the rotating shaft and slide back and forth along the arc-shaped convex strips respectively. The arc-isolating parts of the two arc-isolating plates contact the two moving contact pieces through the arc-shaped convex strips, thereby reducing the friction between the two arc-isolating plates and the two moving contact pieces, ensuring that the two moving contact pieces can reliably perform the opening and closing actions, and ensuring that the two arc-isolating plates can better separate the static contact of the common power supply and the static contact of the load, and the static contact of the standby power supply and the static contact of the load, avoiding the occurrence of arcing, thereby facilitating the extension of the service life of the contact system.

[0008] In particular, convex strips in contact with two moving contact pieces are respectively arranged on the middle parts of both sides of the arc isolation parts of the two arc isolation plates, and the convex strips on both sides of the arc isolation parts of the two arc isolation plates separate the static contact of the common power supply and the static contact of the load, and the static contact of the standby power supply and the static contact of the load. The convex strips on the arc isolation plates contact the two moving contact pieces, so that the convex strips can separate the static contact of the common power supply and the static contact of the load, and the static contact of the standby power supply and the static contact of the load, so as to avoid arcing between the static contact of the common power supply and the static contact of the load, and the static contact of the standby power supply and the static contact of the load, thereby facilitating the extension of the service life of the contact system.

[0009] In particular, an arc extinguishing cavity is formed between the two arc isolation plates and the housing, four exhaust holes are arranged on the housing corresponding to the two ends of the common power static contact, the standby power static contact and the load static contact, and arc extinguishing channels connected between the arc extinguishing cavity and the four exhaust holes are arranged in the housing. The arc extinguishing channel can quickly guide the arc to the exhaust hole, avoid arc erosion of the contact assembly, and help to extend the service life of the contact system.

[0010] In particular, the four exhaust holes are respectively provided with arc extinguishing plates, and the arc extinguishing plates are respectively provided with a plurality of arc extinguishing holes. The exhaust holes are provided with arc extinguishing plates, which can extinguish the residual arc and achieve the purpose of zero arcing.

[0011] Particularly, a plurality of arc-guiding convex strips are respectively distributed in an interlaced manner in the arc-extinguishing channel.

[0012] In particular, the other ends of the two arc-isolating plates are provided with positioning grooves, and the housing is provided with positioning bosses matched with the positioning grooves, and the positioning bosses are engaged in the positioning grooves to form a snap-fitting fit between the two arc-isolating plates and the positioning bosses. The positioning grooves of the arc-isolating plates are engaged with the positioning bosses of the housing, thereby facilitating the assembly of the arc-isolating plates and the housing, and achieving higher assembly efficiency.

[0013] In particular, the other ends of the two arc isolation plates have two symmetrically distributed fixing feet, and the fixing feet are provided with fasteners connected to the housing. The arc isolation plates are connected to the housing through the fixing feet, so that the arc isolation plates and the housing are easily assembled, and the assembly is more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional diagram of the internal structure of an embodiment of the present invention.

[0015] Figure 2 It is a front view of the internal structure of an embodiment of the present invention.

[0016] Figure 3 It is a three-dimensional diagram of an arc isolation plate according to an embodiment of the present invention.

[0017] Figure 4 This is an assembly diagram of the moving contact piece and the rotating shaft according to an embodiment of the present invention. DETAILED DESCRIPTION

[0018] like Figures 1 to 4As shown, the embodiment of the present invention is a contact system of a dual power automatic transfer switch, comprising a housing 10, a contact assembly 20 arranged in the housing 10, the contact assembly 20 comprising a rotating shaft 21 rotatably arranged in the housing 10, two moving contact pieces 22, a load static contact 23, a common power static contact 24, and a standby power static contact 25 linked to the rotating shaft 21, two clamping spaces 220 matching with the load static contact 23, the common power static contact 24, and the standby power static contact 25 are formed between the two ends of the two moving contact pieces 22, two arc isolation plates 26 are arranged in the housing 10 to separate the common power static contact 24 from the load static contact 23, and the standby power static contact 25 from the load static contact 23, one end of the two arc isolation plates 26 has arc isolation portions 261 respectively inserted into the two clamping spaces 220 of the two moving contact pieces 22, and the two moving contact pieces 22 move with the rotating shaft 21 and slide back and forth on both sides of the arc isolation portions 261 of the two arc isolation plates 26. Arc-shaped convex strips 262 matching the motion tracks of the two moving contact pieces 22 are respectively arranged on both sides of the arc-isolating portions 26 of the two arc-isolating plates 26. The two moving contact pieces 22 move with the rotating shaft 22 and slide back and forth along the arc-shaped convex strips 262. The arc-isolating portions of the two arc-isolating plates contact the two moving contact pieces through the arc-shaped convex strips, thereby reducing the friction between the two arc-isolating plates and the two moving contact pieces, ensuring that the two moving contact pieces can reliably perform the opening and closing actions, and ensuring that the two arc-isolating plates can better separate the common power supply static contact and the load static contact, and the standby power supply static contact and the load static contact, avoiding arcing, thereby facilitating the extension of the service life of the contact system. The middle parts of the two arc-isolating plates 26 on both sides of the arc-isolating portions 26 are provided with convex strips 263 in contact with the two moving contact pieces 22, respectively. The convex strips 263 on both sides of the arc-isolating portions of the two arc-isolating plates 26 separate the common power static contact 24 from the load static contact 23, and the standby power static contact 25 from the load static contact 23. The convex strips on the arc-isolating plates are in contact with the two moving contact pieces, so that the convex strips can separate the common power static contact from the load static contact, and the standby power static contact from the load static contact, thereby avoiding arcing between the common power static contact and the load static contact, and between the standby power static contact and the load static contact, thereby facilitating the extension of the service life of the contact system.

[0019] like Figure 1 and 2As shown, an arc extinguishing cavity 200 is formed between the two arc isolating plates 26 and the housing 10, and four exhaust holes 101 are arranged on the housing 10 at both ends corresponding to the common power static contact 24, the standby power static contact 25, and the load static contact 23, and arc extinguishing channels 102 connected between the arc extinguishing cavity 200 and the four exhaust holes 101 are arranged in the housing 10. The arc extinguishing channel can quickly guide the arc to the exhaust hole to avoid arc burning of the contact assembly, which is beneficial to prolonging the service life of the contact system. The four exhaust holes 101 are respectively provided with arc extinguishing plates 11, and the arc extinguishing plates 11 are respectively provided with a plurality of arc extinguishing holes 111. An arc extinguishing plate is arranged in the exhaust hole, and the arc extinguishing plate can extinguish the residual arc to achieve the purpose of zero arcing. A plurality of arc guiding convex strips 103 are respectively distributed in the arc extinguishing channel 102 in an interlaced manner. The other ends of the two arc-isolating plates 26 are provided with positioning grooves 264, and the housing 10 is provided with positioning bosses 104 that match the positioning grooves 261. The positioning bosses 104 are engaged in the positioning grooves 261, and constitute the snap-fitting of the two arc-isolating plates 26 and the positioning bosses 104. The positioning grooves of the arc-isolating plates are engaged with the positioning bosses of the housing, so as to facilitate the assembly of the arc-isolating plates and the housing, and the assembly efficiency is higher. The other ends of the two arc-isolating plates 26 are provided with two symmetrically distributed fixing feet 265, and the fixing feet 261 are provided with fasteners connected to the housing 10. The arc-isolating plates are connected to the housing through the fixing feet, so as to facilitate the assembly of the arc-isolating plates and the housing, and the assembly is more convenient.

[0020] Two arc-isolating plates are provided between the static contact of the common power supply and the static contact of the load, and between the static contact of the standby power supply and the static contact of the load, so that the two arc-isolating plates can isolate the arcs generated by the static contact of the common power supply and the static contact of the load, and between the static contact of the standby power supply and the static contact of the load, to prevent arcing, and to avoid arcing erosion of the contact components of the contact system. The arc-isolating parts of the two arc-isolating plates are inserted into the hijacking space of the two moving contacts, and during the opening and closing actions of the two moving contacts, the arc-isolating parts of the two arc-isolating plates can always isolate the arc, and the anti-arcing performance is better. Therefore, the contact system has the advantages of simple structure, stable and reliable performance, arcing prevention, and long service life.

[0021] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above, or modify it into an equivalent equivalent embodiment without departing from the scope of the technical solution of the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A contact system of a dual power automatic transfer switch, comprising a housing, a contact assembly arranged in the housing, the contact assembly comprising a rotating shaft rotatably arranged in the housing, two movable contact pieces linked to the rotating shaft, a load static contact, a common power static contact, and a standby power static contact, two clamping spaces are formed between the two ends of the two movable contact pieces to match the load static contact, the common power static contact, and the standby power static contact, characterized in that: Two arc-isolating plates are arranged in the shell to separate the static contact of the common power supply and the static contact of the load, and the static contact of the standby power supply and the static contact of the load. One end of the two arc-isolating plates has an arc-isolating portion respectively inserted into the two clamping spaces of the two moving contact pieces. The two moving contact pieces move with the rotating shaft and slide back and forth on both sides of the arc-isolating portions of the two arc-isolating plates respectively.

2. The contact system of the dual power automatic transfer switch according to claim 1 is characterized in that: Arc-shaped convex strips matching the movement tracks of the two moving contact pieces are respectively arranged on both sides of the arc-isolation parts of the two arc-isolation plates. The two moving contact pieces move with the rotating shaft and slide back and forth along the arc-shaped convex strips respectively.

3. The contact system of the dual power automatic transfer switch according to claim 1 or 2, characterized in that: The middle parts of the two arc isolation parts of the two arc isolation plates are respectively provided with convex strips in contact with the two moving contact pieces, and the convex strips on both sides of the arc isolation parts of the two arc isolation plates are separated between the normal power supply static contact and the load static contact, and between the standby power supply static contact and the load static contact.

4. The contact system of the dual power automatic transfer switch according to claim 1 or 2, characterized in that: An arc extinguishing cavity is formed between the two arc isolation plates and the shell. Four exhaust holes are arranged on the shell at both ends corresponding to the common power static contact, the standby power static contact and the load static contact. Arc extinguishing channels connecting the arc extinguishing cavity and the four exhaust holes are respectively arranged in the shell.

5. The contact system of the dual power automatic transfer switch according to claim 4 is characterized in that: Arc extinguishing sheets are respectively arranged in the four exhaust holes, and a plurality of arc extinguishing holes are respectively arranged on the arc extinguishing sheets.

6. The contact system of the dual power automatic transfer switch according to claim 4 is characterized in that: A plurality of arc-guiding convex strips are respectively and staggeredly distributed in the arc-extinguishing channel.

7. The contact system of the dual power automatic transfer switch according to claim 1 or 2, characterized in that: The other ends of the two arc isolation plates are provided with positioning grooves, and the housing is provided with positioning bosses matched with the positioning grooves. The positioning bosses are engaged in the positioning grooves, and constitute a snap fit between the two arc isolation plates and the positioning bosses.

8. The contact system of the dual power automatic transfer switch according to claim 1 or 2, characterized in that: The other ends of the two arc isolation plates are provided with two symmetrically distributed fixing feet, and the fixing feet are provided with fasteners connected with the shell.

Images