Contact assembly of three-power-supply change-over switch

Abstract

The utility model relates to a three-power-supply change-over switch contact assembly which comprises a first power supply static contact, a second power supply static contact, a third power supply static contact, a load static contact and a moving contact assembly which are arranged between a base and a cover, and the moving contact assembly can clockwise and anticlockwise rotate by 360 degrees between the base and the cover. When the moving contact assembly rotates, six stay positions exist, three positions are provided with static contacts and moving contacts which are contacted, three closing positions are correspondingly arranged, and three positions are not provided with static contacts, and three opening positions are correspondingly arranged. The moving contact assembly is based on a rotating shaft and a moving contact shell and comprises two moving contacts installed on the moving contact shell, the moving contact shell is sleeved with the two moving contacts through spring frames, a main spring is arranged between the two moving contacts, and contact pressure is provided through the main spring.

Description

TECHNICAL FIELD

[0001] The disclosed subject matter relates to devices belonging to electrical systems, and more particularly to a three power source transfer switch. BACKGROUND

[0002] The automatic transfer switch can selectively connect the load to the first power source, the second power source or the third power source according to the state of the power supply quality of the first power source, the second power source and the third power source, and in the automatic state, when the first power source fails, the automatic transfer switch can automatically switch from the first power source to the second power source or the third power source, ensuring the connectivity and reliability of power supply; when the line is repaired or both the double power sources fail, there should also be a position where the first power source, the second power source and the third power source are disconnected at the same time, i.e. the full split position.

[0003] The three power source transfer switch contact assembly is the execution component of the automatic transfer switch when switching automatically or manually, which needs to complete the breaking of the operating current and also withstands a large fault current impact. SUMMARY

[0004] The present application provides a contact structure of a three power source transfer switch which solves the above problems.

[0005] The present application is implemented by the following technical scheme: the three power source transfer switch contact assembly comprises a base and a cover, and is provided with a first power source static contact, a second power source static contact, a third power source static contact, a load static contact and a moving contact assembly in the middle of the base and the cover, wherein the moving contact assembly can rotate in the middle of the base and the cover.

[0006] The moving contact assembly is based on a rotating shaft and a moving contact shell, and two moving contacts are installed on the moving contact shell, the two moving contacts are sleeved on the moving contact shell through a spring frame, and a main spring is further arranged in the middle to provide contact pressure.

[0007] The base and the cover are respectively provided with a circular hole in the center, and the two circular holes provide a rotating center for the rotating shaft in the moving contact assembly, and the moving contact assembly can rotate clockwise or counterclockwise.

[0008] The rotating shaft is provided with three rectangular grooves, and a spring support and a small spring are arranged in each rectangular groove, and the head of the spring support is pointed; the spring support can move in the groove.

[0009] The cover is provided with a high ring, and the inner wall of the ring is provided with six protrusions, and the middle of each protrusion is a groove, and the grooves are uniformly distributed within 360 degrees, and the six positions are the stopping positions of the moving contact assembly during rotation, and three positions have static contacts and moving contacts, which correspond to three closed positions; three positions have no static contacts, which correspond to three open positions.

[0010] The load static contact has three static contact ends, and the three static contact ends are respectively corresponding to the first power static contact, the second power static contact and the third power static contact due to the fact that the load static contact is fixed in the base and the cover and is relatively fixed. The moving contact is connected with the first power static contact and the load static contact end, namely the first power is connected, when the moving contact assembly rotates. The moving contact is connected with the second power static contact and the load static contact end, namely the second power is connected, when the moving contact assembly rotates. The moving contact is connected with the third power static contact and the load static contact end, namely the third power is connected, when the moving contact assembly rotates.

[0011] The rotating shaft of the moving contact assembly is connected with the moving contact shell through a rivet or a screw, and is formed in one body.

[0012] One end of the rotating shaft is provided with a convex cross, and the other end is provided with a recessed cross groove, and the two ends are used for the linkage of the multi-pole three power switch contact assembly to realize the power supply conversion between the multi-powers of the three power switch.

[0013] The moving contact of the application is a group, which meets the design requirement of mechanically avoiding the short circuit between the powers.

[0014] The application is two moving contacts, and the moving contact and the static contact are in plug-in structure, which has the characteristics of being able to withstand large short circuit current. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structure perspective view for the implementation of the application.

[0016] Figure 2 It is a schematic view of the moving contact assembly.

[0017] Figure 3 It is a schematic view of the rotation limit of the moving contact assembly.

[0018] Figure 4 It is a schematic view of the moving contact assembly in the base and the cover.

[0019] Figure 5 It is a first power closing schematic view.

[0020] Figure 6 It is a second power closing schematic view.

[0021] Figure 7 It is a third power closing schematic view.

[0022] Figure 8 It is a full power opening schematic view.

[0023] Figure 9 It is a schematic view of the combined use of the application.

[0024] Figure 10 : Load static contact structure schematic diagram.

[0025] List of illustrations: base 1, second power static contact 2, load static contact 3, movable contact 4, first power static contact 5, movable contact shell 6, rotating shaft 7, cover 8, cover hole 9, spring support 10, main spring 11, third power static contact 12, spring frame 13, limit spring 14, base hole 15, rotating shaft groove 16, rotating shaft boss 17, ring 18, groove 19, rectangular slot 20, load static contact contact end 21, movable contact assembly 100, three power transfer switch contact assembly 101. DETAILED DESCRIPTION

[0026] As shown in Figure 1 : Three power transfer switch contact assembly includes: base 1 and cover 8 in the middle of the first power static contact 5, second power static contact 2, third power static contact 12, load static contact 3 and movable contact assembly 100, wherein the movable contact assembly 100 can rotate between the base 1 and the cover 8.

[0027] As shown in Figure 2 : Movable contact assembly 100 is based on rotating shaft 7 and movable contact shell 6, and two movable contacts 4 are installed on movable contact shell 6. Two movable contacts 4 are sleeved on movable contact shell 6 through spring frame 13, and main spring 11 is provided in the middle, and contact pressure is provided through main spring 11.

[0028] As shown in Figure 4 : The center of base 1 and cover 8 has reference hole 15 and cover hole 9 respectively, and the two round holes provide rotating center for rotating shaft 7 in movable contact assembly 100, and movable contact assembly 100 can rotate clockwise or counterclockwise.

[0029] As shown in Figure 2 : Rotating shaft 7 has three rectangular slots 20, spring support 10 and limit spring 14 are arranged in each rectangular slot 20, and the head of spring support 10 is pointed; spring support 10 can move in rectangular slot 20.

[0030] As shown in Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 10 : Load static contact 3 has three load static contact contact ends 21, and load static contact 3 is fixed in the middle of base 1 and cover 8 and is relatively fixed, and the three load static contact contact ends 21 correspond to first power static contact 5, second power static contact 2 and third power static contact 12 respectively.

[0031] When the moving contact assembly 100 rotates, the moving contact 4 connects the first power supply static contact 5 and the load static contact contact end 21 on the load static contact 3, i.e. the first power supply is connected;

[0032] When the moving contact assembly 100 rotates, the moving contact 4 connects the second power supply static contact 2 and the load static contact contact end 21 on the load static contact 3, i.e. the second power supply is connected;

[0033] When the moving contact assembly 100 rotates, the moving contact 4 connects the third power supply static contact 12 and the load static contact contact end 21 on the load static contact 3, i.e. the third power supply is connected.

[0034] The rotating shaft 7 of the moving contact assembly 100 can be connected with the conversion mechanism to receive the driving torque from the mechanism. Therefore, the rotating shaft 7 needs to be connected with the moving contact shell 6 through rivets or screws to form an integral whole.

[0035] As shown in Figure 3 , Figure 4 and Figure 9 : one end of the rotating shaft 7 is provided with a protruding cross rotating shaft boss 17 and the other end is provided with a recessed cross groove rotating shaft recess 16, which are used for the linkage of the multi-pole three power supply conversion switch contact assembly 101, and are matched with the conversion driving mechanism of the conversion switch to realize the power supply conversion between the power supplies of the three power supply conversion switch.

Claims

1. Three power transfer switch contact assembly, characterized by: include: A first power static contact, a second power static contact, a third power static contact, a load static contact and a moving contact assembly are arranged between the base and the cover, wherein the moving contact assembly can rotate between the base and the cover.

2. The three-source power conversion switch contact assembly according to claim 1, characterized in that: The moving contact assembly is based on a rotating shaft and a moving contact housing, and two moving contacts are installed on the moving contact housing. The two moving contacts are sleeved on the moving contact housing through a spring frame, and there is a main spring in the middle to provide contact pressure.

3. The three-source power conversion switch contact assembly according to claim 1, characterized in that: There are circular holes in the center of the base and the cover respectively. These two circular holes provide a rotation center for the rotating shaft in the moving contact assembly. The moving contact assembly can rotate clockwise or counterclockwise.

4. The three-source power transfer switch contact assembly according to claim 2, characterized in that: The rotating shaft is provided with three rectangular grooves, each of which is provided with a spring support and a limit spring. The head of the spring support is pointed; the spring support can move in the rectangular groove.

5. The three-source power transfer switch contact assembly according to claim 1, characterized in that: There is a high-opening circular ring on the cover, with 6 protrusions on the inner wall of the ring, and a groove in the middle of the protrusion. The grooves are evenly distributed within 360 degrees. These six positions are the stop positions of the moving contact assembly when it rotates. There are three positions where the static contact and the moving contact are in contact, corresponding to the three closing positions; there are three positions without static contacts, corresponding to the three opening positions.

6. The three-source power transfer switch contact assembly according to claim 1, characterized in that: The load static contact has three contact ends. Since the load static contact is fixed as a whole between the base and the cover and is relatively immovable, the three contact ends on the load static contact correspond to the first power static contact, the second power static contact, and the third power static contact respectively. When the moving contact assembly rotates, the moving contacts are respectively connected to the contact ends of the first power static contact and the load static contact, that is, the first power is connected; When the moving contact assembly rotates, the moving contacts are respectively connected to the contact ends of the second power supply static contact and the load static contact, that is, the second power supply is connected; When the moving contact assembly rotates, the moving contacts are respectively connected to the contact ends of the third power static contact and the load static contact, that is, the third power is connected.

7. The three-source power transfer switch contact assembly according to claim 1, characterized in that: The rotating shaft of the moving contact assembly and the moving contact housing are connected by rivets or screws to form a whole.

8. The three-source power transfer switch contact assembly according to claim 2, characterized in that: One end of the rotating shaft is provided with a raised cross and the other end is a recessed cross slot, and these two ends are used to connect the contact components of the multi-pole three-power conversion switch to realize power supply conversion between multiple power sources of the three-power conversion switch.

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