CN201289797Y - Permanent magnet type double power supply transfer switch - Google Patents

Abstract

The utility model discloses a permanent-magnet dual-power conversion switch, which comprises a main body of a vacuum circuit breaker and a dual-power switching device; the main body of the vacuum circuit breaker includes three vacuum arc-extinguishing mechanisms each equipped with a moving contact and a static contact. , an operating mechanism for driving the moving contact to perform opening and closing actions; the dual power switching device includes three main power inlet columns, three backup power inlet columns, and three main power inlet columns and The isolating knives for switching between the corresponding standby power supply incoming lines and the drive mechanism for providing power for the rotation of the isolating knives; the isolating knives are electrically connected to a corresponding static contact; The moving contacts are respectively electrically connected to one outlet column; the operating mechanism is a permanent magnet operating mechanism. The utility model has the advantages of relatively simple structure, few fault sources and high reliability.

Description

Permanent magnet dual power switch

technical field

The utility model relates to the technical field of high-voltage switch structure design, in particular to a permanent-magnet double-power switch.

Background technique

In the power network, there are many users who have high requirements on the reliability of power supply, such as coal mines and oil refineries. Once a power outage occurs in these units, it will bring significant economic losses or even casualties to the unit. Therefore, the power supply in these units In the system, both the main power supply and the backup power supply are required. When the main power supply fails, the backup power supply must be put into power immediately to restore the power supply. In order to achieve this purpose, it is necessary to manually switch between the main power supply and the backup power supply through a dual power supply switching mechanism. or switch automatically.

The traditional dual power switching mechanism uses two high-voltage switch cabinets plus a set of extremely complex electrical interlocking devices to prevent parallel operation of the two circuits. This double power supply device has following three big defects: (1) locking is unreliable: at present, the electrical interlocking reliability is too low, is strictly forbidden to use, and the country of mechanical interlocking device has no uniform design specification standard again, can only be designed and transformed by each locality. (2) The operation is complicated, and it is easy to jam, causing electric accidents; (3) The investment is large, and two switch cabinets need to be purchased, and then the locking device is designed, and then refitted to the switch cabinet.

At present, the domestic dual power supply switching mechanism generally uses two circuit breakers, and connects the incoming line terminals of each circuit breaker to a power supply, and then connects the outgoing line terminals of the two circuit breakers in parallel, and realizes this through an electrical interlocking device. Switch between main power and backup power. The disadvantage of this dual power switching mechanism is poor reliability and may lead to serious accidents; for example, when the main power supply circuit is powered off for routine maintenance, the coil in the circuit breaker connected to the main power may be burned out, However, the circuit in the circuit breaker remains on, at this time, the other circuit breaker in the dual power switching mechanism will immediately connect to the backup power supply to continue power supply, which will cause the main power supply circuit that should have been powered off. It is also charged, which can easily cause electric shock accidents for maintenance personnel who overhaul the main power circuit. In addition, due to the need to purchase two circuit breakers, the investment is relatively large.

The whole mission of the circuit breaker, in the final analysis, is reflected in the opening and closing actions of the contacts, and the opening and closing actions are realized through the operating mechanism. It plays an extremely important role in the working performance and reliability of the device. The operating mechanism of the switchgear requires more mechanical parts, which not only has high cost, but also has low reliability, because the possibility of rising failure rate is directly proportional to the number of parts. There are two kinds of operating mechanisms commonly used at present: spring mechanism and electromagnetic mechanism. The spring operating mechanism is an operating mechanism that uses the stored energy spring as the power to make the circuit breaker operate. Spring energy storage is usually done by the electric motor through the reduction gear. The entire operating mechanism can be roughly divided into four parts: spring energy storage, maintenance of closing and closing maintenance and opening of the gate. The advantage of the spring operating mechanism is that it does not require a high-power DC power supply, the motor power is small, AC and DC are dual-purpose, and it is suitable for AC operation; its disadvantage is that the structure is relatively complicated, the number of parts is large (about 200), and high processing accuracy is required. , the manufacturing process is complicated, the cost is high, and the reliability of the mechanism is not easy to guarantee. The advantages of the electromagnetic operating mechanism are simple structure, small number of parts (about 120), reliable operation, and low manufacturing cost, but its disadvantages are that the power consumed by the closing coil is too large, the pressure of the contacts is small, and the mechanism The heavy and long action time requires users to equip expensive battery packs.

Utility model content

The purpose of the utility model is to provide a permanent-magnet dual-power switch with relatively simple structure, few fault sources and high reliability.

The technical solution to realize the purpose of this utility model is: a permanent magnet dual power supply switch, including a vacuum circuit breaker main body and a dual power supply switching device; the vacuum circuit breaker main body includes three The vacuum arc extinguishing mechanism, an operating mechanism for driving the moving contact to open and close; the dual power switching device The isolating knives for switching between the power supply incoming line post and the corresponding standby power supply incoming line post, and the driving mechanism for providing power for the rotation of the isolating knife; each of the isolating knives is electrically connected to a corresponding static contact; each of the The moving contacts in the vacuum arc extinguishing mechanism are respectively electrically connected to one outlet post; the feature is that the operating mechanism is a permanent magnet operating mechanism.

In the above technical solution, the permanent magnet operating mechanism includes a switch spindle, a permanent magnet drive mechanism for driving the switch spindle to rotate, and three insulating push rods that can be driven by the switch spindle to move up and down; One end of the rod is connected with a corresponding moving contact in a vacuum arc extinguishing mechanism.

In the above technical solution, a mechanism crank arm and three phase crank arms are arranged on the switch main shaft, and the mechanism crank arm and the three phase crank arms rotate synchronously with the switch main shaft; one end of the mechanism crank arm is fixedly arranged on On the switch main shaft, the other end is rotatably connected to the moving iron core in the permanent magnet drive mechanism; one end of each phase crank arm is fixedly arranged on the switch main shaft, and the other end is rotatably connected to the insulating push rod.

In the above technical solution, the moving iron core in the permanent magnet drive mechanism is fixedly connected to a transmission rod provided with a waist-shaped hole, and the crank arm of the mechanism is connected to the transmission rod through a circular shaft passing through the waist-shaped hole. connection, so as to realize the rotational connection between the crank arm of the mechanism and the moving iron core in the permanent magnet drive mechanism.

In the above technical solution, the main body of the vacuum circuit breaker includes a buffer mechanism, and the buffer mechanism includes a buffer arm and a spring matched with the buffer arm; the buffer arm is arranged on the switch main shaft; the spring One end of one end is connected with the switch housing, and the other end is connected with the buffer arm; the arc extinguishing mechanism is arranged vertically; the switch spindle is arranged horizontally, and the permanent magnet drive mechanism is arranged under the center of the switch spindle Bottom right; when the permanent magnet drive mechanism is set under the center of the switch main shaft, the number of the buffer mechanisms is two, and they are respectively located on both sides of the switch main shaft; when the permanent magnet drive mechanism is set on When the switch main shaft is at the lower right side, the number of the buffer mechanism is one, and it is located at the left end of the switch main shaft.

In the above technical solution, the permanent magnet driving mechanism includes a housing, a front cover and a rear cover fixed on both sides of the housing, a coil assembly arranged in the housing, a moving iron core, and an annular ring composed of permanent magnet sheets. A permanent magnet, a yoke ring for limiting the permanent magnet, and an adjusting bolt for adjusting the distance between the yoke ring and the front cover.

In the above technical solution, the coil assembly includes at least one annular opening coil; the moving iron core includes an armature and a main shaft fixed to the armature; the opening coil is arranged on the yoke ring close to the rear seal Between one end of the cover and the rear cover; the armature is located in the center hole of the yoke ring; the main shaft is located in the center hole of the coil.

In the above technical solution, the permanent magnet is arranged around the yoke ring and sandwiched between the inner wall of the housing and the outer wall of the yoke ring;

In the above technical solution, the inner wall of the housing or the outer wall of the yoke ring is provided with an annular groove for limiting the permanent magnet, and the permanent magnet is arranged in the groove;

Or: the inner wall of the housing is provided with a protruding platform protruding inward, the outer wall of the yoke ring is provided with a protruding ring protruding outward, and the combination of the protruding platform and the protruding ring forms a limiting groove, The permanent magnet is arranged in the limiting groove.

In the above technical solution, the front cover is provided with an adjustment screw hole matched with the adjustment bolt, and after the adjustment bolt is screwed into the adjustment screw hole, its end abuts against the front of the yoke ring. On one side of the cover; the number of the adjusting bolts is three to eight.

The utility model has positive effects:

(1) In this utility model, due to the adoption of a permanent magnet operating mechanism, a brand-new working principle and structure are adopted, which greatly simplifies the structure, does not require a mechanism release and locking device, and has fewer fault sources, which is different from the traditional spring Compared with the electromagnetic mechanism, the mechanism has higher reliability.

(2) In the present utility model, the main body of the vacuum circuit breaker can also be equipped with a buffer mechanism, the buffer mechanism includes a buffer arm and a spring matched with the buffer arm, and the buffer arm is arranged on the main shaft of the switch Above; one end of the spring is connected to the switch housing, and the other end is connected to the buffer crank arm. When the permanent magnet drive mechanism is arranged on the lower right side of the main shaft of the switch, the number of the buffer mechanism is one. Compared with the traditional spring mechanism and electromagnetic mechanism, it can save a buffer arm and the The spring that the crank arm matches, this just makes the utility model be simplified in structure, also reduced cost simultaneously.

(3) In the present utility model, the arc extinguishing mechanism is arranged vertically; the switch main shaft is arranged horizontally, and the permanent magnet drive mechanism is arranged under the center or to the right of the switch main shaft; this structure is different from the traditional handle Compared with the spring mechanism and the electromagnetic mechanism arranged on the side of the switch main shaft, it has the advantage of occupying a smaller area.

(4) In the utility model, the permanent magnet drive mechanism includes a housing, a front cover and a rear cover fixed on both sides of the housing, a coil assembly arranged in the housing, a moving iron core, and a permanent magnet plate. An annular permanent magnet, a yoke ring for limiting the permanent magnet, and an adjusting bolt for adjusting the distance between the yoke ring and the front cover. The permanent magnet driving mechanism with this structure has a yoke ring for limiting the permanent magnet and an adjusting bolt for adjusting the distance between the yoke ring and the front cover; The adjustment bolt further adjusts the distance between the yoke ring and the front cover, so as to make it meet the requirements of use; at the same time, in the process of use, because the adjustment bolt is always tightly pressed against the proximity of the yoke ring, One side of the front cover, thereby effectively preventing the yoke ring from loosening and shifting due to mechanical vibration, and effectively ensuring the reliability, stability and long-term service life of this embodiment.

(5) In the present utility model, the specific setting method of the permanent magnet can be selected: the inner wall of the housing or the outer wall of the yoke ring is provided with an annular groove for limiting the permanent magnet, and the permanent magnet set in the groove;

Or: the inner wall of the housing is provided with a protruding platform protruding inward, the outer wall of the yoke ring is provided with a protruding ring protruding outward, and the combination of the protruding platform and the protruding ring forms a limiting groove, The permanent magnet is arranged in the limiting groove.

This structure enables the adjusting bolt to limit the yoke ring and at the same time limit the permanent magnet to avoid loosening and displacement due to vibration.

Description of drawings

Fig. 1 is the structural representation of the first structure of the utility model;

Fig. 2 is a structural schematic diagram of the permanent magnet dual-power transfer switch shown in Fig. 1 viewed from another angle;

Fig. 3 is a schematic diagram of a three-dimensional structure of the permanent magnet driving mechanism in the permanent magnet dual power supply switch shown in Fig. 1;

Fig. 4 is a structural schematic view of the permanent magnet drive mechanism shown in Fig. 3 viewed from the direction of the front cover;

Fig. 5 is a sectional view along line A-A of Fig. 4;

Fig. 6 is a schematic diagram of a three-dimensional structure of the permanent magnet drive mechanism shown in Fig. 3 after the front cover is removed;

Fig. 7 is a schematic diagram of a half-section structure of the permanent magnet drive mechanism shown in Fig. 3 after the permanent magnet is removed;

Fig. 8 is a schematic diagram of a half-section structure of the permanent magnet drive mechanism used in the second structure of the present invention after removing the permanent magnet;

Fig. 9 is a half-section schematic diagram of the permanent magnet drive mechanism used in the third structure of the present invention after removing the permanent magnet.

The symbols shown in the drawings are: vacuum circuit breaker main body 1, switch housing 11, dual power switching device 2, main power inlet column 21, backup power inlet column 22, isolation knife 23, driving mechanism 24, vacuum arc extinguishing mechanism 3. Static contact 32, outlet post 33, operating mechanism 4, switch spindle 5, mechanism arm 51, phase arm 52, permanent magnet drive mechanism 6, moving iron core 61, housing 62, boss 621, front seal Cover 63, adjusting screw hole 631, rear cover 64, coil assembly 65, opening coil 651, bobbin 652, armature 661, main shaft 662, permanent magnet 67, yoke ring 68, protruding ring 681, adjusting bolt 69, insulating top Rod 7, transmission rod 8, waist-shaped hole 81, buffer mechanism 9, buffer arm 91, spring 92, annular groove 100, limit groove 200.

Detailed ways

(Example 1)

Fig. 1 to Fig. 7 have shown the first kind of specific embodiment of the present utility model, wherein, Fig. 1 is the structure diagram of the first kind of structure of the present utility model; Schematic diagram of the structure when viewed from an angle; Figure 3 is a schematic diagram of a three-dimensional structure of the permanent magnet drive mechanism in the permanent magnet dual power switch shown in Figure 1; Figure 4 is the front cover of the permanent magnet drive mechanism shown in Figure 3 Schematic view of the structure when viewed from the direction; Fig. 5 is a cross-sectional view along the A-A line of Fig. 4; Fig. 6 is a schematic diagram of a three-dimensional structure of the permanent magnet drive mechanism shown in Fig. 3 after removing the front cover; Fig. 7 is a schematic view of the structure shown in Fig. 3 A schematic diagram of a half-section structure of the permanent magnet drive mechanism after removing the permanent magnet.

This embodiment is a permanent magnet type dual power supply switch, including a vacuum circuit breaker main body 1 and a dual power supply switching device 2; Arc extinguishing mechanism 3, an operating mechanism 4 for driving the moving contact to open and close, and a buffer structure 9; the dual power switching device 2 includes three main power supply incoming lines 21, three backup power incoming lines Column 22, three isolation knives 23 that can be switched between the main power inlet column 21 and the corresponding backup power input column 22, and a drive mechanism 24 that provides power for the rotation of the isolation knife 23; the isolation knives 23 is electrically connected to a corresponding static contact 32; the moving contacts in each vacuum arc extinguishing mechanism 3 are respectively electrically connected to an outlet post 33; the operating mechanism is a permanent magnet operating mechanism.

The permanent magnet operating mechanism includes a switch main shaft 5, a permanent magnet drive mechanism 6 for driving the switch main shaft 5 to rotate, and three insulating push rods 7 that can be driven by the switch main shaft 5 to move up and down; One end of the rod 7 is connected with a moving contact in a corresponding vacuum arc extinguishing mechanism 3 .

The switch main shaft 5 is provided with a mechanism crank arm 51 and three phase crank arms 52, and the mechanism crank arm 51 and the three phase crank arms 52 rotate synchronously with the switch main shaft 5; one end of the mechanism crank arm 51 is fixed Set on the switch main shaft 5, the other end is rotationally connected with the moving iron core 61 in the permanent magnet drive mechanism 6; one end of each phase arm 52 is fixed on the switch main shaft 5, and the other end is connected to the insulating top Rod 7 is connected in rotation.

The moving iron core 61 in the permanent magnet drive mechanism 6 is fixedly connected to a transmission rod 8 provided with a waist-shaped hole 81, and the mechanism crank arm 51 and the transmission rod 8 pass through the circular hole 81 through the waist-shaped hole 81. The rotating shafts are connected, so as to realize the rotational connection between the crank arm 51 of the mechanism and the moving iron core 61 in the permanent magnet driving mechanism 6 .

The buffer mechanism 9 includes a buffer arm 91 and a spring 92 matched with the buffer arm 91; the buffer arm 91 is arranged on the switch main shaft 5; one end of the spring 92 is connected to the switch housing 11 The other end is connected with the buffer crank arm 91; the arc extinguishing mechanism is arranged vertically; the switch main shaft 5 is arranged horizontally, as shown in Figure 2, the permanent magnet drive mechanism 6 can be arranged on the Below the center or below the right side; in this embodiment, it is arranged below the right side of the switch main shaft 5 , and the number of the buffer mechanism 9 is one, and it is located at the left side of the switch main shaft 5 .

In practice, the permanent magnet drive mechanism 6 can also be arranged below the center of the switch main shaft 5, and at this time, the number of the buffer mechanisms 9 is two, and they are respectively located on both sides of the switch main shaft 5, so as to Maintain the balance of the switch spindle.

3 to 7, the permanent magnet drive mechanism 6 includes a housing 62, a front cover 63 and a rear cover 64 fixed on both sides of the housing 62, a coil assembly 65 arranged in the housing 62, a dynamic Iron core, annular permanent magnet 67 composed of permanent magnet pieces, yoke ring 68 for limiting the permanent magnet 67 and three adjustments for adjusting the distance between the yoke ring 68 and the front cover 63 Bolt 69.

The coil assembly 65 includes an annular opening coil 651 and a coil bobbin 652; the moving iron core 61 includes an armature 661 and a main shaft 662 fixedly arranged with the armature 661; the opening coil 651 is arranged on the yoke ring 68 between the side end close to the rear cover 64 and the rear cover 64; the armature 661 is located in the center hole of the yoke ring 68; the main shaft 662 is located in the coil center hole.

The permanent magnet 67 is arranged around the yoke ring 68 and sandwiched between the inner wall of the housing 62 and the outer wall of the yoke ring 68; specifically: the inner wall of the housing 62 is provided with a protrusion protruding inward. platform 621, the outer wall of the yoke ring 68 is provided with a protruding ring 681 protruding outward, the combination of the protruding platform 621 and the protruding ring 681 forms a limit groove 200, and the permanent magnet 67 is arranged in the limit In slot 200.

The front cover 63 is provided with three adjusting screw holes 631 matched with the adjusting bolts 69 , and the ends of the adjusting bolts 69 are screwed into the adjusting screw holes 631 and abut against the proximity of the yoke ring 68 . One side end of the front cover 63 .

(Example 2)

Fig. 8 is a half-section schematic diagram of the permanent magnet drive mechanism used in the second structure of the present invention after removing the permanent magnet, showing the second embodiment of the present invention.

This embodiment is basically the same as Embodiment 1, except that, as shown in FIG. 8 , the arrangement of the permanent magnets is different. In this embodiment, the inner wall of the housing 62 is provided with an annular groove 100 for limiting the permanent magnet 67 , and the permanent magnet 67 is disposed in the groove 100 . This structure enables the adjusting bolt to limit the yoke ring and at the same time limit the permanent magnet to avoid loosening and displacement due to vibration.

(Example 3)

Fig. 9 is a half-sectional schematic diagram of the permanent magnet drive mechanism used in the third structure of the present invention after removing the permanent magnet, showing the third embodiment of the present invention.

This embodiment is basically the same as Embodiment 1, except that, as shown in FIG. 9 , the arrangement of the permanent magnets is different. In this embodiment, the outer wall of the yoke ring 68 is provided with an annular groove 100 for limiting the permanent magnet 67 , and the permanent magnet 67 is disposed in the groove 100 . This structure enables the adjusting bolt to limit the yoke ring and at the same time limit the permanent magnet to avoid loosening and displacement due to vibration.

Embodiment 1 to embodiment 3 have positive effect:

(1) In the above-mentioned embodiment 1 to embodiment 3, due to the use of a permanent magnet operating mechanism, a new working principle and structure are adopted, which greatly simplifies the structure, does not require mechanism release and locking devices, and has fewer fault sources , Compared with the traditional spring mechanism and electromagnetic mechanism, it has higher reliability.

(2) In the above-mentioned embodiments 1 to 3, the main body of the vacuum circuit breaker can also be equipped with a buffer mechanism, and the buffer mechanism includes a buffer arm and a spring matched with the buffer arm. The arm is arranged on the main shaft of the switch; one end of the spring is connected with the switch housing, and the other end is connected with the buffer crank arm. When the permanent magnet drive mechanism is arranged on the lower right side of the main shaft of the switch, the number of the buffer mechanism is one. Compared with the traditional spring mechanism and electromagnetic mechanism, it can save a buffer arm and the The spring matched with the crank arm makes the structure of the above-mentioned embodiment 1 to embodiment 3 simplified, and also reduces the cost.

(3) In the above-mentioned embodiments 1 to 3, the arc extinguishing mechanism is arranged vertically; the switch spindle is arranged horizontally, and the permanent magnet drive mechanism is arranged below the center of the switch spindle or to the right; this structure Compared with the traditional arrangement of the spring mechanism and the electromagnetic mechanism on the side of the switch main shaft, it has the advantage of smaller footprint.

(4) In the above embodiment 1 to embodiment 3, the permanent magnet drive mechanism includes a housing, a front cover and a rear cover fixed on both sides of the housing, a coil assembly arranged in the housing, a moving iron core, An annular permanent magnet composed of permanent magnet pieces, a yoke ring for limiting the permanent magnet, and an adjusting bolt for adjusting the distance between the yoke ring and the front cover. The permanent magnet driving mechanism with this structure has a yoke ring for limiting the permanent magnet and an adjusting bolt for adjusting the distance between the yoke ring and the front cover; The adjustment bolt further adjusts the distance between the yoke ring and the front cover, so that it meets the requirements of use; at the same time, in the process of use, because the adjustment bolt is always tightly pressed against the approach of the yoke ring, One side of the front cover, thereby effectively preventing the yoke ring from loosening and shifting due to mechanical vibration, and effectively ensuring the reliability, stability and long-term service life of this embodiment.

Apparently, the above-mentioned embodiments of the present utility model are only examples for clearly illustrating the present utility model, rather than limiting the implementation manner of the present utility model. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. And these obvious changes or variations derived from the spirit of the present utility model are still within the protection scope of the present utility model.

Claims (10)

1. A permanent-magnet dual-power transfer switch, comprising a vacuum circuit breaker main body (1) and a dual-power switching device (2); the vacuum circuit breaker main body (1) includes three The vacuum arc extinguishing mechanism (3) of the head (32), an operating mechanism (4) for driving the moving contact to open and close, and three outlet posts (33); the dual power switching device (2) It includes three main power inlet posts (21), three backup power inlet posts (22), and three switchable main power inlet posts (21) and corresponding backup power inlet posts (22). The isolating knife (23) and the drive mechanism (24) that provides power for the rotation of the isolating knife (23); each of the isolating knives (23) is electrically connected to a corresponding static contact (32); each of the vacuum The moving contacts in the arc extinguishing mechanism (3) are respectively electrically connected to one outlet post; the feature is that the operating mechanism is a permanent magnet operating mechanism. 2. The permanent-magnet dual-power transfer switch according to claim 1, characterized in that: the permanent-magnet operating mechanism includes a switch main shaft (5), a permanent-magnet driving mechanism for driving the switch main shaft (5) to rotate (6), three insulating push rods (7) that can be driven by the switch spindle (5) to move up and down; one end of each of the insulating push rods (7) is connected to a corresponding vacuum arc extinguishing mechanism (3) The moving contacts are connected. 3. The permanent-magnet dual-power transfer switch according to claim 2, characterized in that: the switch main shaft (5) is provided with a mechanism lever (51) and three phase levers (52), the The mechanism arm (51) and the three phase arms (52) rotate synchronously with the switch main shaft (5); one end of the mechanism arm (51) is fixed on the switch main shaft (5), and the other end is connected to the permanent The moving iron core (61) in the magnetic drive mechanism (6) is rotatably connected; one end of each phase crank arm (52) is fixedly arranged on the switch main shaft (5), and the other end rotates with the insulating push rod (7) connect. 4. The permanent-magnet dual-power transfer switch according to claim 3, characterized in that: the moving iron core (61) in the permanent-magnet driving mechanism (6) is connected to a transmission with a waist-shaped hole (81). The rod (8) is fixedly connected, and the mechanism crank arm (51) is connected with the transmission rod (8) through a circular shaft passing through the waist-shaped hole (81), thereby realizing the mechanism crank arm (51) and the transmission rod (8). The rotating connection of the moving iron core (61) in the permanent magnet driving mechanism (6). 5. The permanent-magnet dual-power transfer switch according to claim 4, characterized in that: the main body (1) of the vacuum circuit breaker includes a buffer mechanism (9), and the buffer mechanism (9) includes a buffer arm ( 91) and the spring (92) matched with the buffer arm (91); the buffer arm (91) is arranged on the switch main shaft (5); one end of the spring (92) is connected to the switch housing (11) are connected, and the other end is connected with the buffer arm (91); the arc extinguishing mechanism is arranged vertically; the switch spindle (5) is arranged horizontally, and the permanent magnet drive mechanism (6) is arranged on the switch spindle (5) below the center or to the right; when the permanent magnet drive mechanism (6) is arranged below the center of the switch main shaft (5), the number of the buffer mechanisms (9) is two, and they are respectively located Both ends of the switch main shaft (5); when the permanent magnet drive mechanism (6) is arranged on the lower right side of the switch main shaft (5), the number of the buffer mechanism (9) is one, and it is located on the switch main shaft (5) on the left side. 6. The permanent-magnet dual-power transfer switch according to claim 3, characterized in that: the permanent-magnet driving mechanism (6) comprises a housing (62), front seals fixed on both sides of the housing (62) Cover (63) and rear cover (64), coil assembly (65) arranged in the casing (62), moving iron core (61), ring-shaped permanent magnet (67) composed of permanent magnet sheets, used for limiting A yoke (68) for positioning the permanent magnet (67) and an adjusting bolt (69) for adjusting the distance between the yoke (68) and the front cover (63). 7. The permanent magnet type dual power supply transfer switch according to claim 6, characterized in that: the coil assembly (65) includes at least one annular opening coil (651); the moving iron core (61) includes an armature (661) and the main shaft (662) fixedly arranged with the armature (661); Between the covers (64); the armature (661) is located in the center hole of the yoke ring (68); the main shaft (662) is located in the center hole of the coil. 8. The permanent magnet type dual power supply transfer switch according to claim 6, characterized in that: the permanent magnet (67) is arranged around the yoke ring (68), and is sandwiched between the inner wall of the housing (62) and the Between the outer walls of the yoke ring (68); 9. The permanent-magnet dual-power transfer switch according to claim 8, characterized in that: the inner wall of the housing (62) or the outer wall of the yoke ring (68) is provided with a permanent magnet (67 ) in the annular groove (100), the permanent magnet (67) is arranged in the groove (100); Or: the inner wall of the housing (62) is provided with a boss (621) protruding inwardly, and the outer wall of the yoke ring (68) is provided with a protruding ring (681) protruding outward, and the boss (621) and the protruding ring (681) are combined to form a limiting groove (200), and the permanent magnet (67) is arranged in the limiting groove (200). 10. The permanent-magnet dual-power transfer switch according to claim 6, characterized in that: the front cover (63) is provided with an adjustment screw hole (631) matched with the adjustment bolt (69), After the adjusting bolt (69) is screwed into the adjusting screw hole (631), its end abuts against the side end of the yoke ring (68) close to the front cover (63); the adjusting bolt ( 69) is in number from three to eight.

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