Manual operating mechanism of three-power conversion switch

Abstract

The present invention discloses a manual operating mechanism for a three - power - source transfer switch, which includes output terminals, a first power - source static contact, a second power - source static contact, a third power - source moving contact, a third power - source static contact, a transition conductive plate, a lifting member, and a transmission shaft. The first power - source static contact and the second power - source static contact are respectively electrically connected to the transition conductive plate. The third power - source moving contact is electrically connected to the output terminals through a flexible wire. The transmission shaft is used to drive the third power - source moving contact to rotate between the transition conductive plate and the third power - source static contact through the lifting member, so that the third power - source moving contact is electrically connected to the transition conductive plate or the third power - source static contact. The manual operating mechanism for a three - power - source transfer switch of the present invention has a reasonable structure, is convenient to operate, and when switching to the third power source to supply power to the load, it can ensure that other power sources cannot be connected to the load, so as to avoid short - circuit between power sources, and has high reliability and safety.

Description

Technical Field

[0001] The present invention relates to a manual operating mechanism for a three - power conversion switch. Background Art

[0002] With the rapid progress of urbanization in China, there are numerous high - rise buildings, among which there are electrical equipment such as fire control systems, elevators, and lighting in large shopping malls (large gathering places of people), belonging to "Class I (important) electrical loads". According to the power supply and distribution design specifications, three power sources are required to ensure the power supply reliability and continuity. Similar to the double - power conversion switch, the three - power conversion switch is also equipped with an operating mechanism, and the operating mechanism is divided into an electric operating mechanism and a manual operating mechanism. Generally, the electric operating mechanism is mainly used to control the automatic conversion between power sources. However, when the electric operating mechanism fails or in case of an emergency, it is necessary to force - switch to the third power supply to supply power to the load through the manual operating mechanism. However, the structure of the existing manual operating mechanism of the three - power conversion switch is relatively complex, and its reliability and safety need to be improved. Summary of the Invention

[0003] The purpose of the present invention is to provide a manual operating mechanism for a three - power conversion switch, which has a reasonable structure, is convenient to operate, and when switching to the third power supply to supply power to the load, can ensure that other power sources cannot be connected to the load to avoid short - circuit between power sources, and has high reliability and safety.

[0004] To achieve the above-mentioned purpose, the technical solution of the present invention is to design a manual operating mechanism for a three-power conversion switch, wherein the three-power conversion switch includes a shell, and an output terminal, a first power moving contact, a first power static contact used in conjunction with the first power moving contact, a second power moving contact, a second power static contact used in conjunction with the second power moving contact, a third power moving contact, and a third power static contact used in conjunction with the third power moving contact, arranged in the shell. The manual operating mechanism includes a transition conductive plate, a lifting member and a transmission shaft. The transition conductive plate is fixedly connected in the shell, the first power static contact and the second power static contact are electrically connected to the transition conductive plate, respectively, a No. 1 contact block is provided on the top of the transition conductive plate, the third power static contact is located above the transition guide plate, and a No. 2 contact block is provided at the bottom of the third power static contact, and one end of the third power moving contact is connected to the transition conductive plate through a first shaft pin. The third power moving contact is rotatably connected in the shell, and an electrical contact is provided at the other end of the third power moving contact, which is located between contact block No. 1 and contact block No. 2, and contact block No. 3 and contact block No. 4 are provided on the electrical contact, the contact block No. 3 corresponds to contact block No. 1, and the contact block No. 4 corresponds to contact block No. 2, the output terminal is electrically connected to the third power moving contact through a soft wire, the lifting member is a U-shaped structure with an opening facing upward, the third power moving contact is inserted into the opening of the lifting member, and the third power moving contact is rotatably connected to the lifting member through a second axle pin, a mounting hole is provided on the shell, and the transmission shaft is rotatably set in the mounting hole, and a driving arm is formed by extending radially outward on the outer peripheral surface of the transmission shaft, and the driving arm extends to the opening of the lifting member, and a card slot is provided on the driving arm, and a third axle pin is provided in the lifting member above the second axle pin, and the third axle pin is clamped in the card slot.

[0005] Preferably, the shell is provided with a mounting groove with an opening toward the third power moving contact, and the mounting groove is provided with a clamping piece that can swing up and down, and the clamping piece is a C-shaped structure with an opening facing away from the third power moving contact, and a compression spring is fixedly connected to the opening of the clamping piece, and the other end of the compression spring is fixedly connected to the mounting groove, and the end of the third power moving contact away from the electrical contact is a sharp end, and the sharp end abuts against the clamping piece.

[0006] Preferably, a shifting arm is formed on the outer peripheral surface of the transmission shaft and extends radially outward.

[0007] Preferably, a vertical guide groove is provided in the shell, the second shaft pin and the third shaft pin both extend into the vertical guide groove, and the second shaft pin and the third shaft pin both slide in cooperation with the vertical guide groove.

[0008] Preferably, the first power static contact and the second power static contact are respectively fixedly connected to the top of the transition conductive plate by screws.

[0009] Preferably, the first contact block is fixedly connected to the transition conductive plate by welding, and the second contact block is fixedly connected to the static contact of the third power supply by welding.

[0010] The advantages and beneficial effects of the present invention are as follows: A manual operating mechanism for a three - power - source transfer switch is provided, which has a reasonable structure and is convenient to operate. When switching to the third power source to supply power to the load, it can ensure that other power sources cannot be connected to the load, so as to avoid short - circuits between power sources, and has high reliability and safety. Moreover, by setting the pressing member and the compression spring, the moving contact of the third power source can be pressed tightly by the elastic force of the compression spring, so that the contact block on the moving contact of the third power source is in close contact with the transition conductive plate or the contact block on the static contact of the third power source, thereby improving the stability of electrical contact. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a schematic diagram of the present invention.

[0012] Figure 2 is Figure 1 the enlarged view of part A in

[0013] Figure 3 is a schematic diagram of the transmission shaft in the present invention.

[0014] Figure 4 is a schematic diagram of the lifting member in the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0015] The following combines the drawings and embodiments to further describe the specific implementation manners of the present invention. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention, and cannot be used to limit the protection scope of the present invention.

[0016] The technical solution specifically implemented by the present invention is:

[0017] As Figures 1 to 4As shown in the figure, a manual operating mechanism for a three-power conversion switch. The three-power conversion switch includes a housing 1, and output terminals 2, a first power moving contact, a first power static contact 3 used in cooperation with the first power moving contact, a second power moving contact, a second power static contact 4 used in cooperation with the second power moving contact, a third power moving contact 5, and a third power static contact 6 used in cooperation with the third power moving contact arranged in the housing 1. The manual operating mechanism includes a transition conductive plate 7, a lifting member 8, and a transmission shaft 9. The transition conductive plate 7 is fixedly connected in the housing 1. The first power static contact 3 and the second power static contact 4 are respectively electrically connected to the transition conductive plate 7. A first contact block 10 is provided at the top of the transition conductive plate 7. The third power static contact 6 is located above the transition guide plate 7, and a second contact block 11 is provided at the bottom of the third power static contact 6. One end of the third power moving contact 5 is rotatably connected in the housing 1 through a first pin 12. The other end of the third power moving contact 5 is provided with an electrical contact head 13. The electrical contact head 13 is located between the first contact block 10 and the second contact block 11, and a third contact block 14 and a fourth contact block 15 are provided on the electrical contact head 13. The third contact block 14 corresponds to the first contact block 10, and the fourth contact block 15 corresponds to the second contact block 11. The output terminal 2 is electrically connected to the third power moving contact 5 through a flexible wire 16. The lifting member 8 is a U-shaped structure with an upward opening. The third power moving contact 5 passes through the opening of the lifting member 8, and the third power moving contact 8 is rotatably connected to the lifting member 8 through a second pin 17. An installation hole is provided on the housing 1. The transmission shaft 9 is rotatably arranged in the installation hole. A driving arm 18 extends radially outward along the outer peripheral surface of the transmission shaft 9. The driving arm 18 extends into the opening of the lifting member 8, and a card slot 19 is provided on the driving arm 18. A third pin 20 located above the second pin 17 is provided in the lifting member 8. The third pin 20 is clamped in the card slot 19. By adopting the above solution, when the first power and the second power fail or it is necessary to forcibly use the third power to supply power to the load in an emergency, the transmission shaft 9 is driven to rotate a certain angle in the clockwise direction. Thus, the transmission shaft 9 drives the lifting member 8 to move upward in place through the driving arm 18 and the second pin 20. During this process, the lifting member 8 will drive the third power moving contact 5 to swing upward through the first pin 17, so that the fourth contact block 15 on the third power moving contact 5 is in electrical contact with the second contact block 11 on the third power static contact 6. At this time, the third power static contact 6 is conducted with the output terminal 2, and the third power supplies power to the load. And because the third contact block 14 on the third power moving contact 5 is in a disconnected state from the first contact block 10 on the transition conductive plate 7 at this time, the first power static contact 3 and the second power static contact 4 are both kept disconnected from the output terminal 2, so that the first power and the second power cannot be connected to the load, thus avoiding a short circuit between the power supplies.When the driving transmission shaft 9 rotates a certain angle in the counterclockwise direction, the transmission shaft 9 will drive the lifting member 8 to move downward into place through the driving arm 18 and the second shaft pin 20. During this process, the lifting member 8 will drive the third power moving contact 5 to swing downward through the first shaft pin 17, so that the No. 3 contact block 14 on the third power moving contact 5 is electrically contacted with the No. 1 contact block 10 on the transition conductive plate 7. At this time, the first power static contact 3 and the second power static contact 4 are connected to the output terminal 2, and the load can be powered by the first power supply or the second power supply. Specifically, when the first power moving contact and the first power static contact 3 are closed, the first power supply is used to supply power, and when the second power moving contact and the second power static contact 4 are closed, the second power supply is used to supply power.

[0018] Furthermore, the housing 1 is provided with a mounting groove 21 with an opening toward the third power moving contact 5, and the mounting groove 21 is provided with a pressing piece 22 that can swing up and down. The pressing piece 22 is a C-shaped structure with an opening facing away from the third power moving contact 5, and a compression spring 23 is fixedly connected to the opening of the pressing piece 22, and the other end of the compression spring 23 is fixedly connected to the mounting groove 21. The end of the third power moving contact 5 away from the electrical contact 13 is a sharp end, and the sharp end abuts against the pressing piece 22. By adopting the above scheme, when the third power moving contact 5 swings up and down, the third power moving contact 5 will drive the pressing piece 22 to swing in the opposite direction through its sharp end. When the third power moving contact 5 swings into place, the elastic force of the compression spring 23 will make the pressing piece 22 tightly abut against the sharp end of the third power moving contact 5, which is conducive to keeping the third power moving contact 5 in the current position state, thereby keeping the corresponding contact blocks in close contact, thereby improving the stability of the electrical contact.

[0019] Furthermore, a toggle arm 24 is formed on the outer circumferential surface of the transmission shaft 9 and extends radially outward. By adopting the above solution, the operator can drive the external handle to rotate the toggle arm 24, so that the toggle arm 24 drives the transmission shaft 9 to rotate.

[0020] Furthermore, a vertical guide groove 25 is provided in the housing 1, and the second shaft pin 17 and the third shaft pin 20 both extend into the vertical guide groove 25, and the second shaft pin 17 and the third shaft pin 20 both slide in cooperation with the vertical guide groove 25. By adopting the above solution, the stability of the lifting member 8 when moving up and down is improved.

[0021] Furthermore, the first power static contact 3 and the second power static contact 4 are respectively fixedly connected to the top of the transition conductive plate 7 by screws.

[0022] Furthermore, the first contact block 10 is fixedly connected to the transition conductive plate 7 by welding, and the second contact block 11 is fixedly connected to the third power static contact 6 by welding.

[0023] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A manual operating mechanism for a three - power - source transfer switch, the three - power - source transfer switch comprising a housing, and output terminals, a first power - source moving contact, a first power - source static contact used in cooperation with the first power - source moving contact, a second power - source moving contact, a second power - source static contact used in cooperation with the second power - source moving contact, a third power - source moving contact, and a third power - source static contact disposed in the housing, characterized in that, The manual operating mechanism includes a transition conductive plate, a lifting member and a transmission shaft, the transition conductive plate is fixedly connected in the shell, the first power static contact and the second power static contact are electrically connected to the transition conductive plate respectively, a No. 1 contact block is provided on the top of the transition conductive plate, the third power static contact is located above the transition guide plate, and a No. 2 contact block is provided at the bottom of the third power static contact, one end of the third power moving contact is rotatably connected in the shell through a first shaft pin, the other end of the third power moving contact is provided with an electrical contact, the electrical contact is located between the No. 1 contact block and the No. 2 contact block, and the electrical contact is provided with a No. 3 contact block and a No. 4 contact block, the No. 3 contact The contact block corresponds to the No. 1 contact block, the No. 4 contact block corresponds to the No. 2 contact block, the output terminal is electrically connected to the third power moving contact through a soft wire, the lifting member is a U-shaped structure with an opening facing upward, the third power moving contact is inserted into the opening of the lifting member, and the third power moving contact is rotatably connected to the lifting member through a second shaft pin, a mounting hole is provided on the shell, the transmission shaft is rotatably set in the mounting hole, a driving arm is radially extended outward on the outer circumference of the transmission shaft, the driving arm extends to the opening of the lifting member, and a card slot is provided on the driving arm, a third shaft pin is provided in the lifting member and is located above the second shaft pin, and the third shaft pin is clamped in the card slot; The shell is provided with a mounting groove with an opening toward the third power moving contact, and the mounting groove is provided with a clamping piece that can swing up and down. The clamping piece is a C-shaped structure with an opening facing away from the third power moving contact, and a compression spring is fixedly connected to the opening of the clamping piece, and the other end of the compression spring is fixedly connected to the mounting groove. The end of the third power moving contact away from the electrical contact is a sharp end, and the sharp end abuts against the clamping piece.

2. The manual operating mechanism of the three-power conversion switch according to claim 1, characterized in that, The outer peripheral surface of the transmission shaft is provided with a toggle arm extending radially outward.

3. The manual operating mechanism of the three-power conversion switch according to claim 2, characterized in that, A vertical guide groove is provided in the shell, and the second shaft pin and the third shaft pin both extend into the vertical guide groove, and the second shaft pin and the third shaft pin both slide in cooperation with the vertical guide groove.

4. The manual operating mechanism of the three-power source changeover switch according to claim 3, characterized in that, The first power static contact and the second power static contact are respectively fixedly connected to the top of the transition conductive plate by screws.

5. The manual operating mechanism of the three-power conversion switch according to claim 4, characterized in that, The No. 1 contact block is fixedly connected to the transition conductive plate by welding, and the No. 2 contact block is fixedly connected to the third power supply static contact by welding.

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