CN204390939U - The contact system of dual-power transfer switch - Google Patents

Abstract

The utility model relates to a contact system of a dual power supply switch, comprising a moving contact seat, a moving contact piece, a reed, a rotating shaft, an incoming line terminal, and an outgoing line terminal. The moving contact seat is fixedly placed on the rotating shaft, and the moving contact Ring-shaped moving contact frames are formed on both sides of the head seat, and the two moving contact pieces are relatively set on the moving contact seat between the two moving contact frames. Between the moving contact frames, the moving contact piece is Y-shaped toward the outer ring to form a moving contact for incoming lines and two moving contacts for outgoing lines. On the outside of the first moving contact, two incoming line terminals are respectively arranged on both sides of the incoming line moving contact. Between the contacts, the corresponding moving contacts on the outgoing line terminals form outgoing line static contacts. The utility model has a simple structure, is not easy to be mistakenly connected, and can prevent two different power supplies from running in parallel.

Description

Contact system of dual power transfer switch

technical field

The utility model relates to a contact system, in particular to a contact system of a dual power supply switch.

Background technique

The dual power automatic transfer switch is used in the power supply system when the main power supply fails, it can not only prevent the faulty power supply from supplying power to the load, but also reliably select a qualified power supply for normal operation to ensure uninterrupted power supply. Generally, places that are more important to use, such as hospitals, airports, and docks, rely on dual power automatic transfer switches to provide continuous power supply.

The most widely used dual-power automatic transfer switch in China at present is a three-point automatic transfer device. The wiring is a two-way power supply, one for use and one for backup. As a result, electrical interlocks and mechanical interlocks are generally provided between the two switch bodies to prevent two power supplies from being connected in parallel. Under normal circumstances, it can be powered by any one of the two power sources, and the other one is for backup; when the normal power supply fails and the power is cut off, the automatic transfer switch automatically transfers the load to another power supply for power supply, which can be divided according to its different combinations and working principles. There are three types: the first contactor type, which is a combination of two contactors, and is the earliest one used. This combination of device circuits is simple and cheap, but its reliability is poor, and the working contactor coil Long-term electrified work consumes a lot of power. At present, designers are less and less using this combination; the second type is CB-level products, which are composed of two air circuit breakers + controllers, with mechanical interlock and electrical Interlocking, combining the protection switch and the switching switch, it has both protection function and switching function, the system is simple and reliable; the third type of PC-level products, PC-level products are generally packaged in a complete shell, which is composed of two Only the load isolating switch is superimposed and combined with the controller, which has mechanical interlock and electrical interlock. From the above three methods, it can be seen that there are two sets of moving contacts in the traditional dual power transfer switch, which are connected through mechanical and electrical linkage. Lock to achieve, to prevent parallel operation without power supply. When the interlock fails, there will be two different power supplies running in parallel, causing the load equipment to burn out.

Contents of the invention

Due to the above reasons, the purpose of this utility model is to provide a contact system of a dual power switch with simple structure and convenient operation.

In order to achieve the above purpose, the utility model adopts a contact system of a dual power supply switch, including a moving contact seat, a moving contact piece, a reed, a rotating shaft, an incoming line terminal, and an outgoing line terminal. The moving contact seat is fixed and placed on the On the rotating shaft, ring-shaped moving contact frames are formed on both sides of the moving contact seat, and the two moving contact pieces are relatively set on the moving contact seat between the two moving contact frames, and the two reeds are respectively arranged on the two moving contact pieces. Between the moving contact frame on each side, the incoming line terminal and the outgoing line terminal are respectively arranged on both sides of the moving contact piece, and the moving contact piece is Y-shaped toward the outer ring to form three moving contacts, and the three moving contacts They are one incoming line moving contact at one end and two outgoing line moving contacts at the other end. One side of the reed is connected to the moving contact frame, and the other end is on the outside of the three moving contacts of the moving contact piece. The line terminals are respectively arranged on both sides of the incoming line moving contacts. The corresponding incoming line moving contacts on the two incoming line terminals form the incoming line static contacts. The outgoing line terminals are arranged between the two outgoing line moving contacts. The moving contact of the outgoing line forms the static contact of the outgoing line.

The utility model is further configured such that the moving contact seat is a section of square shaft between the two moving contact frames, and the center of the moving contact sheet forms a square groove matching the square shaft of the moving contact seat. The opening is arranged between the two outgoing moving contacts, and the same reed slot as the square slot is also formed on the reed.

The utility model is further configured such that the square shaft forms an arc surface on one side of the opening of the square slot which is the same as that of the moving contact frames on both sides.

The utility model is further configured such that the two incoming line static contacts and the incoming line terminals are perpendicular to each other and extend to both sides of the incoming line moving contacts, and the outgoing line static contacts and the outgoing line terminals extend obliquely to two sides at an angle of 135°. Between the moving contacts of the outgoing lines, the thicknesses of the static contacts of the incoming lines and the static contacts of the outgoing lines are adapted to the distance between the two moving contacts.

The utility model is further configured such that a square hole is formed in the center of the movable contact seat, the section of the rotating shaft is square, and the rotating shaft passes through the square hole of the moving contact seat.

The utility model is further configured such that the inner side edge of the moving contact forms an arc surface, and the outer side edges of the incoming line static contact and the outgoing line static contact are beveled.

The beneficial effect of the utility model is that the two incoming wire terminals are arranged on one side of the moving contact seat, and the outgoing line terminals are arranged on the other side of the moving contact seat, so that the upper-in and lower-out wiring mode commonly used by low-voltage electrical appliances can be adopted, which is not easy Misconnection occurs; the contact adopts a knife switch structure, and the moving contact is connected to the static contact of the incoming line connected to the incoming line terminal of the main power supply and the backup power supply through rotation, and one incoming line moving contact is between the two incoming line terminals Switching, only one incoming line terminal can be connected at the same time, which can effectively prevent two different power supplies from running in parallel; when two outgoing line moving contacts are connected to any incoming line static contact, there will be an outgoing line moving contact The contact is connected to the static contact of the outgoing line; the opening of the square slot of the moving contact is set between the two outgoing moving contacts so that the conductor distance from the incoming moving contact to the two outgoing moving contacts is the same, and the same electric value can be maintained. Performance; the connection between the moving contact and the static contact in terms of the arc edge of the moving contact.

Description of drawings

Fig. 1 is the schematic diagram of the specific embodiment of the utility model.

Fig. 2 is a side view of the specific embodiment of the utility model after the terminals are removed.

Fig. 3 is a schematic diagram of a movable contact piece in a specific embodiment of the present invention.

Fig. 4 is a schematic diagram of a moving contact seat in a specific embodiment of the present invention.

Fig. 5 is a schematic cross-sectional view of a specific embodiment of the present invention in a dual power switch.

Detailed ways

As shown in Figure 1-Figure 5, the specific embodiment of the utility model is a contact system of a dual power switch, including a moving contact seat 1, two moving contact pieces 2, two reeds 3, and a rotating shaft 6 , two incoming wire terminals 4, outgoing wire terminals 5, a square hole 14 is formed in the center of the moving contact seat 1, the cross section of the rotating shaft 6 is square, and the rotating shaft 6 passes through the square hole 14 of the moving contact seat 1, and the moving contact seat 1 has two The side forms an annular moving contact frame 11, and the moving contact seat 1 is a section of square shaft 12 between the two moving contact frames 11, and the center of the moving contact piece 2 forms a square shaft 12 that matches the moving contact seat 1. Slot 21, two moving contact pieces 2 are set in pairs on the square shaft 12 between the two moving contact frames 11, and the same reed groove as the square groove 21 is also formed on the reed 3, and the two pieces of reed 3 are respectively arranged Between the two moving contact pieces 2 and the moving contact frame 11 on each side, the moving contact piece 2 is Y-shaped toward the outer ring to form three moving contacts, and the inner edges of the three moving contacts form an arc surface 22. The two moving contacts are respectively an incoming line moving contact 23 at one end and two outgoing line moving contacts 24 at the other end, the opening of the square groove 21 of the moving contact piece 2 is arranged between the two outgoing line moving contacts 24, The square shaft 12 of the contact seat 1 forms the same circular arc surface 13 as the moving contact frame 11 on one side of the opening of the square groove 21. One side of the reed 3 is connected to the moving contact frame 11, and the other end is against the moving contact piece. 2 outside the three moving contacts (23, 24), two incoming line terminals 4 are respectively arranged on both sides of the incoming line moving contact 23, and the corresponding incoming line moving contacts 23 on the two incoming line terminals 4 form the incoming line The static contact 41, the two incoming static contacts 41 and the incoming terminal 4 are perpendicular to each other and extend to both sides of the incoming moving contact 23, the outgoing terminal 5 is arranged between the two outgoing moving contacts 24, and the outgoing terminal Corresponding outgoing line movable contact 24 on 5 forms outgoing line static contact 51, and outgoing line static contact 51 and outgoing line terminal 5 form an angle of 135° and extends obliquely between two outgoing line moving contacts 24, and incoming line static contact 41 and The thickness of the outgoing line static contact 51 is adapted to the distance between the two moving contacts 2, the edges on both sides of the incoming line static contact 41 and the outgoing line static contact 51 are beveled, and the moving contact can just pass through the arc surface of the edge The slope on the edge of the fixed contact and the fixed contact make the moving contact stuck on both sides of the center of the static contact, the contact area is large, and the electrical conductivity is guaranteed.

Claims (6)

1. the contact system of a dual-power transfer switch, comprise movable contact block, movable contact spring, reed, rotating shaft, input terminal, outlet terminal, movable contact block is fixedly set in rotating shaft, movable contact block both sides form the action contact frame of annular, two panels movable contact spring is enclosed within the movable contact block between two action contact frames relatively, two panels reed is separately positioned between the action contact frame of two panels movable contact spring and respective side, input terminal and outlet terminal are separately positioned on the both sides of movable contact spring, it is characterized in that: described movable contact spring is that Y type forms three moving contacts towards outer ring, three moving contacts are respectively an inlet wire moving contact of one end and two outlet moving contacts of the other end, reed side is connected on action contact frame, the other end withstands on outside three moving contacts of movable contact spring, two input terminals are separately positioned on the both sides of inlet wire moving contact, on two input terminals, corresponding inlet wire moving contact forms inlet wire fixed contact, outlet terminal is arranged between two outlet moving contacts, on outlet terminal, corresponding outlet moving contact forms outlet fixed contact.

2. the contact system of dual-power transfer switch according to claim 1, it is characterized in that: described movable contact block is one section of square shaft between two action contact frames, the square groove suitable with the square shaft of movable contact block is formed centrally in described movable contact spring, the opening of square groove is arranged between two outlet moving contacts, and reed also forms the reed trough identical with square groove.

3. the contact system of dual-power transfer switch according to claim 2, is characterized in that: described square shaft forms the arc surface identical with both sides action contact frame at the opening of square groove.

4. the contact system of the dual-power transfer switch according to claim 1,2 or 3, it is characterized in that: described two inlet wire fixed contacts and input terminal are mutually vertically opposite extends to inlet wire moving contact both sides, to be that 135 ° of angles are oblique extend between two outlet moving contacts for outlet fixed contact and outlet terminal, and the distance between the thickness of inlet wire fixed contact and outlet fixed contact and two movable contact springs is adaptive.

5. the contact system of the dual-power transfer switch according to claim 1,2 or 3, is characterized in that: be formed centrally square opening in described movable contact block, and the cross section of rotating shaft is square, and rotating shaft is through in the square opening of movable contact block.

6. the contact system of the dual-power transfer switch according to claim 1,2 or 3, is characterized in that: the inside edge of described moving contact forms cambered surface, and the lateral surface edge of described inlet wire fixed contact and outlet fixed contact is inclined-plane.