Three-pole transfer switch contact assembly

Abstract

The application is a three power source transfer switch contact assembly, which comprises a base, a cover, 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. The moving contact assembly can rotate 360 degrees clockwise and counterclockwise between the base and the cover. When the moving contact assembly rotates, there are six positions, three of which have static contacts and moving contacts in contact, corresponding to three closed positions, and three of which have no static contacts, corresponding to three open positions. 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 arranged in the middle to provide contact pressure.

Description

Technical Field

[0001] The subject matter disclosed in this invention relates to devices belonging to electrical systems, and more specifically to three-power transfer switching devices. Background Technology

[0002] Automatic transfer switches can selectively connect the load to the first, second, or third power supply based on the power quality status of the first, second, and third power supplies. In automatic mode, when the first power supply fails, the automatic transfer switch can automatically switch from the first power supply to the second or third power supply, ensuring the continuity and reliability of the power supply. In case of line maintenance or failure of both power supplies, there should also be a position where the first, second, and third power supplies are simultaneously disconnected, i.e., the fully open position.

[0003] The contact assembly of a three-power transfer switch is the actuator that completes the power transfer when the automatic transfer switch is switched automatically or manually. It needs to disconnect the operating current of the circuit and withstand large fault current surges. Summary of the Invention

[0004] This invention provides a contact structure for a three-power transfer switch that solves the above-mentioned problems by enabling and disabling contact connection.

[0005] This invention is achieved through the following technical solution: A three-power transfer switch contact assembly includes: a first power stationary contact, a second power stationary contact, a third power stationary contact, a load stationary contact, and a moving contact assembly mounted between a base and a cover, wherein the moving contact assembly can rotate between the base and the cover.

[0006] The moving contact assembly consists of a rotating shaft and a moving contact housing as its base, and two moving contacts mounted on the moving contact housing. The two moving contacts are fitted onto the moving contact housing by spring frames, with a main spring in between, which provides contact pressure.

[0007] The base and the cover each have a circular hole in the center. These two holes provide the rotation center for the rotating shaft in the moving contact assembly, which can rotate clockwise or counterclockwise.

[0008] The shaft has three rectangular slots, and each slot contains a spring support and a small spring. The head of the spring support is pointed, and the spring support can move within the slot.

[0009] The cover has a raised ring with six protrusions on its inner wall. The protrusions have grooves in the middle, and the grooves are evenly distributed within 360 degrees. These six positions are the stopping positions of the moving contact assembly when it rotates. There are three positions where the stationary contact and the moving contact are in contact, corresponding to the three closing positions; there are three positions where the stationary contact is not present, corresponding to the three opening positions.

[0010] The load stationary contact has three stationary contact ends. Since the load stationary contact is fixed in place between the base and the cover, these three stationary contact ends correspond to the first power stationary contact, the second power stationary contact, and the third power stationary contact, respectively. When the moving contact assembly rotates, the moving contact connects the first power stationary contact with the load stationary contact end, i.e., the first power is connected. When the moving contact assembly rotates, the moving contact connects the second power stationary contact with the load stationary contact end, i.e., the second power is connected. When the moving contact assembly rotates, the moving contact connects the third power stationary contact with the load stationary contact end, i.e., the third power is connected.

[0011] The rotating shaft of the moving contact assembly is connected to the moving contact housing by rivets or screws to form a whole.

[0012] One end of the shaft has a raised cross and the other end has a recessed cross groove. These two ends are used to connect the contact assembly of the multi-pole three-power transfer switch to realize the power supply conversion between multiple power sources of the three-power transfer switch.

[0013] The moving contacts of this invention are a set, which serves the mechanical design requirement of avoiding short circuits between power supplies.

[0014] The present invention has two moving contacts, and the contact between the moving contacts and the stationary contacts is an insertion structure, which has the characteristics of being able to withstand large short-circuit currents. Attached Figure Description

[0015] Figure 1 : A structural perspective view of an embodiment of the present invention;

[0016] Figure 2 : Schematic diagram of the moving contact assembly;

[0017] Figure 3 : Schematic diagram of the rotation limit of the moving contact assembly;

[0018] Figure 4 : Schematic diagram of the moving contact assembly inside the base and cover;

[0019] Figure 5 : Schematic diagram of the first power supply being switched on.

[0020] Figure 6 : Schematic diagram of the second power supply closing;

[0021] Figure 7 : Schematic diagram of closing the third power supply.

[0022] Figure 8 Schematic diagram of full power supply tripping.

[0023] Figure 9 : Schematic diagram of the combined use of the present invention.

[0024] Figure 10 Schematic diagram of the load stationary contact structure.

[0025] List of symbols in the diagram: Base 1, Second power stationary contact 2, Load stationary contact 3, Moving contact 4, First power stationary contact 5, Moving contact housing 6, Shaft 7, Cover 8, Cover hole 9, Spring support 10, Main spring 11, Third power stationary contact 12, Spring frame 13, Limiting spring 14, Base hole 15, Shaft groove 16, Shaft boss 17, Ring 18, Groove 19, Rectangular slot 20, Load stationary contact end 21, Moving contact assembly 100, Three power transfer switch contact assembly 101. Detailed Implementation

[0026] like Figure 1 As shown: The three-power transfer switch contact assembly includes: a first power stationary contact 5, a second power stationary contact 2, a third power stationary contact 12, a load stationary contact 3, and a moving contact assembly 100, which is mounted between the base 1 and the cover 8. The moving contact assembly 100 can rotate between the base 1 and the cover 8.

[0027] like Figure 2 As shown: The moving contact assembly 100 is based on the rotating shaft 7 and the moving contact housing 6, and two moving contacts 4 are mounted on the moving contact housing 6. The two moving contacts 4 are sleeved on the moving contact housing 6 by the spring frame 13, and there is a main spring 11 in the middle, which provides contact pressure.

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

[0029] like Figure 2 As shown: There are three rectangular slots 20 on the rotating shaft 7. A spring support 10 and a limiting spring 14 are provided in each rectangular slot 20. The head of the spring support 10 is pointed. The spring support 10 can move in the rectangular slot 20.

[0030] like Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 10 As shown: There are three load stationary contact ends 21 on the load stationary contact 3. Since the load stationary contact 3 is fixed in the middle of the base 1 and the cover 8, these three load stationary contact ends 21 correspond to the first power stationary contact 5, the second power stationary contact 2, and the third power stationary contact 12, respectively. When the moving contact assembly 100 rotates, the moving contact 4 connects to the first power supply, and the stationary contact 5 connects to the load stationary contact contact end 21 on the load stationary contact 3, that is, the first power supply is turned on. When the moving contact assembly 100 rotates, the moving contact 4 connects to the second power supply, and the stationary contact 2 connects to the load stationary contact contact end 21 on the load stationary contact 3, that is, the second power supply is turned on. When the moving contact assembly 100 rotates, the moving contact 4 connects to the third power supply, and the stationary contact 12 connects to the load stationary contact end 21 on the load stationary contact 3, that is, the third power supply is turned on.

[0031] The rotating shaft 7 of the moving contact assembly 100 can be connected to the conversion mechanism to receive the driving torque transmitted by the mechanism. Therefore, the rotating shaft 7 needs to be connected to the moving contact housing 6 by rivets or screws to form a whole.

[0032] like Figure 3 , Figure 4 and Figure 9 As shown: One end of the rotating shaft 7 is provided with a raised cross-shaped rotating shaft boss 17 and the other end is a recessed cross-shaped rotating shaft groove 16. These two ends are used for connecting the multi-pole three-power transfer switch contact assembly 101, and together with the transfer drive mechanism of the transfer switch, realize the power supply conversion between the power supplies of the three-power transfer switch.

Claims

1. A three-power transfer switch contact assembly, characterized in that: include: A first power stationary contact, a second power stationary contact, a third power stationary contact, a load stationary contact, and a moving contact assembly are installed between the base and the cover, wherein the moving contact assembly can rotate between the base and the cover.

2. The three-power transfer switch contact assembly according to claim 1, characterized in that: The moving contact assembly consists of a rotating shaft and a moving contact housing as its base, and two moving contacts mounted on the moving contact housing. The two moving contacts are fitted onto the moving contact housing by a spring frame, and there is a main spring in the middle, which provides contact pressure.

3. The three-power transfer switch contact assembly according to claim 1, characterized in that: The base and the cover each have a circular hole in the center. These two holes provide the rotation center for the rotating shaft in the moving contact assembly, which can rotate clockwise or counterclockwise.

4. The three-power transfer switch contact assembly according to claim 2, characterized in that: The rotating shaft has three rectangular slots, and each rectangular slot is equipped with a spring support and a limiting spring. The head of the spring support is pointed. The spring support can move in the rectangular slot.

5. The three-power transfer switch contact assembly according to claim 1, characterized in that: The cover has a raised ring with six protrusions on its inner wall. The protrusions have grooves in the middle, and the grooves are evenly distributed within 360 degrees. These six positions are the stopping positions of the moving contact assembly when it rotates. There are three positions where the stationary contact and the moving contact are in contact, corresponding to the three closing positions; there are three positions where the stationary contact is not present, corresponding to the three opening positions.

6. The three-power transfer switch contact assembly according to claim 1, characterized in that: The load stationary contact has three contact ends. Since the load stationary contact is fixed in the middle of the base and the cover, it is relatively fixed and does not move. The three contact ends on the load stationary contact correspond to the first power stationary contact, the second power stationary contact, and the third power stationary contact, respectively. When the moving contact assembly rotates, the moving contact connects to the first power supply, and the stationary contact connects to the load stationary contact, that is, the first power supply is turned on. When the moving contact assembly rotates, the moving contact connects to the second power supply, and the stationary contact connects to the load stationary contact, that is, the second power supply is turned on. When the moving contact assembly rotates, the moving contact connects to the third power supply, and the stationary contact and the load stationary contact are connected at their respective contact ends, that is, the third power supply is turned on.

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

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

Images