CN220106285U - Neutral pole unit and automatic change-over switch - Google Patents

Abstract

A neutral pole unit and an automatic transfer switch relate to the technical field of piezoelectric devices and comprise a neutral pole unit shell, a neutral pole first fixed contact, a neutral pole second fixed contact, a driving shaft, a neutral pole first contact support, a neutral pole second contact support, a neutral pole first movable contact, a neutral pole second movable contact and an elastic piece; the neutral pole unit has a neutral pole first state, a neutral pole second state and a neutral pole third state; the elastic piece provides pulling force for the first contact support of the neutral pole and the second contact support of the neutral pole to enable the first contact support of the neutral pole and the second contact support of the neutral pole to have a movement trend of approaching each other, and when the driving shaft rotates, the elastic piece can act on the first contact support of the neutral pole and the second contact support of the neutral pole respectively so as to enable the neutral pole unit to be switched among a first state of the neutral pole, a second state of the neutral pole and a third state of the neutral pole. The neutral pole unit and the automatic transfer switch can solve the problem that in the prior art, a neutral line at a load end of the four-pole automatic transfer switch is completely disconnected in the transfer process, so that a zero line vacation phenomenon occurs.

Description

Neutral pole unit and automatic change-over switch

Technical Field

The utility model relates to the technical field of piezoelectric devices, in particular to a neutral pole unit and an automatic transfer switch.

Background

The automatic transfer switch is used for monitoring the power supply circuit and automatically transferring one or more load circuits from one power supply to another power supply, so that uninterrupted power supply is provided for the load, and the continuity of power supply is ensured. The four-pole automatic transfer switch electrical appliance comprises a neutral pole unit and a phase pole unit corresponding to N phases of a power supply, wherein the neutral pole unit or the phase pole unit respectively comprises a movable contact assembly which is rotatably arranged, a fixed contact which is communicated with a first power supply and a fixed contact which is communicated with a second power supply, and the movable contact assembly rotates between the two fixed contacts so as to be respectively contacted with the fixed contact of the first power supply or the fixed contact of the second power supply, so that the switching between the first power supply and the second power supply is realized.

In the automatic conversion process of the automatic change-over switch in the existing market, the other power supply is closed again on the premise of completely cutting off one power supply, and the processing has the advantage of avoiding the condition of short circuit between the two power supplies. However, for the four-pole automatic transfer switch, a new problem is caused, namely that the two power supply systems are completely isolated, but the neutral line at the load end is completely disconnected in the transfer process, the zero line vacation phenomenon occurs, and the neutral point disconnection condition is not allowed in many power distribution systems in the transfer process.

Disclosure of Invention

The utility model aims to provide a neutral pole unit and an automatic transfer switch, which can solve the problem that a neutral line vacation phenomenon occurs when a neutral line at a load end is completely disconnected in a transfer process of a four-pole automatic transfer switch in the prior art.

Embodiments of the present utility model are implemented as follows:

in one aspect of the embodiment of the utility model, a neutral pole unit is provided, which comprises a neutral pole unit shell, a neutral pole first fixed contact and a neutral pole second fixed contact which are fixedly arranged in the neutral pole unit shell, a driving shaft, a neutral pole first contact support and a neutral pole second contact support which are rotatably arranged in the neutral pole unit shell, a neutral pole first movable contact which is fixedly arranged on the neutral pole first contact support, a neutral pole second movable contact which is fixedly arranged on the neutral pole second contact support, and an elastic piece which is connected between the neutral pole first contact support and the neutral pole second contact support; the neutral pole unit is provided with a neutral pole first state in which the neutral pole first moving contact and the neutral pole first fixed contact are separated, the neutral pole second moving contact and the neutral pole second fixed contact are closed, a neutral pole second state in which the neutral pole first moving contact and the neutral pole first fixed contact are closed, the neutral pole second moving contact and the neutral pole second fixed contact are closed, and a neutral pole third state in which the neutral pole first moving contact and the neutral pole first fixed contact are closed, and the neutral pole second moving contact and the neutral pole second fixed contact are separated; the first neutral contact support and the second neutral contact support are coaxially and stacked along the axial direction of the driving shaft, the elastic piece provides pulling force for the first neutral contact support and the second neutral contact support along the arrangement direction of the elastic piece so that the first neutral contact support and the second neutral contact support have a mutual approaching movement trend along the rotation direction of the first neutral contact support and the second neutral contact support, and the first neutral contact support and the second neutral contact support can be acted on when the driving shaft rotates so as to enable the neutral pole unit to be switched among the first neutral pole state, the second neutral pole state and the third neutral pole state. The neutral pole unit can solve the problem that in the prior art, a neutral line of a load end is completely disconnected in the switching process of the four-pole automatic change-over switch to generate a zero line vacation phenomenon.

Optionally, a switch-off and switch-on driving block is arranged on the peripheral wall of the driving shaft, the switch-off and switch-on driving block comprises a first contact surface and a second contact surface which are oppositely arranged, the first contact surface is used for supporting and propping the first contact of the neutral pole, and the second contact surface is used for supporting and propping the second contact of the neutral pole.

Optionally, a first abutting surface is arranged on the first contact support of the neutral pole, and when the first abutting surface abuts against the first contact surface, the neutral pole unit is switched between the first neutral pole state and the second neutral pole state; the neutral pole second contact support is provided with a second abutting surface, and when the second abutting surface abuts against the second contact surface, the neutral pole unit is switched between the neutral pole second state and the neutral pole third state.

Optionally, the first contact of neutral pole supports and is provided with first holding tank, the second contact of neutral pole supports and is provided with the second holding tank, first holding tank with the mutual lock of second holding tank forms jointly and is used for holding the holding spout of divide-shut brake drive piece.

Optionally, the accommodating chute includes a first arc-shaped connecting section protruding toward the first fixed contact of the neutral pole and the second fixed contact of the neutral pole, a second arc-shaped connecting section protruding away from the first fixed contact of the neutral pole and the second fixed contact of the neutral pole, a first U-shaped connecting section recessed toward the first moving contact of the neutral pole and connecting one end of the first arc-shaped connecting section and one end of the second arc-shaped connecting section, and a second U-shaped connecting section recessed toward the second moving contact of the neutral pole and connecting the other end of the first arc-shaped connecting section and the other end of the second arc-shaped connecting section; the first supporting surface is positioned on the folding arm surface of the first U-shaped connecting section, which is close to the first arc-shaped connecting section, and/or the folding arm surface of the second U-shaped connecting section, which is close to the second arc-shaped connecting section, and the second supporting surface is positioned on the folding arm surface of the first U-shaped connecting section, which is close to the second arc-shaped connecting section, and/or the folding arm surface of the second U-shaped connecting section, which is close to the first arc-shaped connecting section.

Optionally, the first contact support of the neutral pole is provided with a first connecting lug, the second contact support of the neutral pole is provided with a second connecting lug, the first connecting lug and the second connecting lug are oppositely arranged, and two opposite ends of the elastic piece are respectively connected with the first connecting lug and the second connecting lug.

Optionally, the first connection lug is disposed on a side of the first moving contact of the neutral pole, which is close to the first fixed contact of the neutral pole, and the second connection lug is disposed on a side of the second moving contact of the neutral pole, which is close to the second fixed contact of the neutral pole.

Optionally, when the neutral pole unit is switched between the neutral pole first state and the neutral pole second state, the rotation angle of the driving shaft is a, the opening angle between the neutral pole first moving contact and the neutral pole first fixed contact is b, the included angle between the first contact surface and the second contact surface is c, the idle stroke angle of the driving shaft is d, and the following relation is satisfied: b=a+c/2-d.

Optionally, the neutral pole unit further includes a fastener, a mounting hole is provided on the first contact support of the neutral pole, a connection hole is provided on the first moving contact of the neutral pole, and the fastener sequentially penetrates through the mounting hole and the connection hole, so that the first moving contact of the neutral pole and the first contact support of the neutral pole are fixedly connected.

Optionally, the first contact of neutral pole supports and is provided with the mounting groove, the first moving contact of neutral pole is fixed to be held and is in the mounting groove, be provided with first spacing portion in the mounting groove, be provided with the spacing portion of second on the first moving contact of neutral pole, first spacing portion with the spacing portion of second mutually support, in order to restrict the relative motion between the first moving contact of neutral pole with the mounting groove.

Optionally, the device further comprises a first flexible connecting wire and a second flexible connecting wire, wherein the first movable contact of the neutral pole is connected with one end of the first flexible connecting wire, the second movable contact of the neutral pole is connected with one end of the second flexible connecting wire respectively, and the other end of the first flexible connecting wire and the other end of the second flexible connecting wire form a connecting end together and are connected with a load bus through the connecting end.

Optionally, the device further comprises two arc-extinguishing chambers, wherein one arc-extinguishing chamber is located on a rotating path of the first moving contact of the neutral pole relative to the first fixed contact of the neutral pole and is used for extinguishing an arc generated between the first moving contact of the neutral pole and the first fixed contact of the neutral pole, and the other arc-extinguishing chamber is located on a rotating path of the second moving contact of the neutral pole relative to the second fixed contact of the neutral pole and is used for extinguishing an arc generated between the second moving contact of the neutral pole and the second fixed contact of the neutral pole.

In another aspect of the embodiment of the utility model, an automatic transfer switch is provided, which comprises an operating mechanism, a plurality of phase pole units and the neutral pole units, wherein the operating mechanism, the phase pole units and the neutral pole units are sequentially stacked, and the operating mechanism is in transmission connection with the phase pole units and the neutral pole units through a driving shaft of the neutral pole units and is used for driving the phase pole units and the neutral pole units to synchronously rotate.

The beneficial effects of the embodiment of the utility model include:

the neutral pole unit comprises a neutral pole unit shell, a neutral pole first fixed contact and a neutral pole second fixed contact which are fixedly arranged in the neutral pole unit shell, a driving shaft, a neutral pole first contact support and a neutral pole second contact support which are rotatably arranged in the neutral pole unit shell, a neutral pole first movable contact which is fixedly arranged on the neutral pole first contact support, a neutral pole second movable contact which is fixedly arranged on the neutral pole second contact support, and an elastic piece which is connected between the neutral pole first contact support and the neutral pole second contact support; the neutral pole unit is provided with a neutral pole first state in which a neutral pole first moving contact and a neutral pole first fixed contact are separated and a neutral pole second moving contact and a neutral pole second fixed contact are closed, a neutral pole second state in which a neutral pole first moving contact and a neutral pole first fixed contact are closed and a neutral pole second moving contact and a neutral pole second fixed contact are closed, and a neutral pole third state in which a neutral pole first moving contact and a neutral pole first fixed contact are closed and a neutral pole second moving contact and a neutral pole second fixed contact are separated; the first neutral contact support and the second neutral contact support are coaxially and stacked along the axial direction of the driving shaft, and the elastic member provides tension to the first neutral contact support and the second neutral contact support along the arrangement direction of the elastic member so that the first neutral contact support and the second neutral contact support have a movement trend of approaching each other along the rotation direction of the elastic member, and when the driving shaft rotates, the elastic member can act on the first neutral contact support and the second neutral contact support respectively so as to switch the neutral pole unit among a first neutral pole state, a second neutral pole state and a third neutral pole state. According to the neutral pole unit, in the switching process from the phase pole unit to the first power supply to the phase pole unit to the second power supply, tension is provided for the neutral pole first contact support and the neutral pole second contact support through the elastic piece to enable the neutral pole first contact support and the neutral pole second contact support to have a movement trend of approaching to each other, and as the operating mechanism rotates, the neutral pole unit respectively acts on the neutral pole first contact support and the neutral pole second contact support through rotation of the driving shaft, so that the neutral pole unit can be switched among a neutral pole first state, a neutral pole second state and a neutral pole third state, at least one of the neutral pole unit, the first power supply and the second power supply is ensured to be switched on, and therefore the automatic change-over switch is ensured to be always on but not to be completely off in the switching process of a load end neutral line, namely an output neutral line of the automatic change-over switch is always communicated with a neutral line of an input power grid, and potential safety hazards caused by a neutral line empty phenomenon are eliminated. Meanwhile, the neutral pole unit has the advantages of simple structure, fewer parts, reliable action and large contact opening distance, and meets the design requirements of miniaturization and modularization of products.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of an automatic transfer switch according to an embodiment of the present utility model;

FIG. 2 is a schematic diagram of a neutral pole unit according to an embodiment of the present utility model;

FIG. 3 is a second schematic structural view of a neutral pole unit according to an embodiment of the present utility model;

FIG. 4 is a third schematic structural view of a neutral pole unit according to an embodiment of the present utility model;

fig. 5 is a schematic structural diagram of a neutral pole unit in a first neutral pole state and a phase pole unit in a first phase pole state according to an embodiment of the present utility model;

fig. 6 is a schematic structural diagram of a neutral pole unit in a second neutral pole state and a phase pole unit in a second phase pole state according to an embodiment of the present utility model;

Fig. 7 is a schematic structural diagram of a neutral pole unit in a neutral pole third state and a phase pole unit in a phase pole third state according to an embodiment of the present utility model;

FIG. 8 is an exploded view of a drive shaft, a first contact support for a neutral pole, a second contact support for a neutral pole, a first moving contact for a neutral pole, a second moving contact for a neutral pole, and an elastic member according to an embodiment of the present utility model;

fig. 9 is a schematic structural diagram of a neutral pole unit in a first neutral pole state according to an embodiment of the present utility model;

fig. 10 is a schematic structural diagram of a neutral pole unit in a second neutral pole state according to an embodiment of the present utility model;

fig. 11 is a schematic structural view of a driving shaft accommodated in an accommodating chute according to an embodiment of the present utility model.

Icon: 100-automatic transfer switch; 10-an operating mechanism; 11-a drive shaft; 111-an opening and closing driving block; 111 a-a first contact surface; 111 b-a second contact surface; 112-indication identification; 20-neutral pole units; 21-a neutral pole unit housing; 211-state identification; 22 a-a neutral pole first stationary contact; 22 b-a neutral pole second stationary contact; 23 a-neutral pole first contact support; 23a 1-a first abutment surface; 23a 3-mounting slots; 23a 4-a first limit part; 23a 5-reinforcing ribs; 23a 6-first connecting lugs; 23 b-neutral second contact support; 23b 1-a second abutment surface; 23b 6-a second connecting ear; 24 a-a neutral pole first moving contact; 24a 1-connecting holes; 24a 2-a second limit part; 24 b-a second movable contact of the neutral pole; 25-an elastic member; 26-a fastener; 27-accommodating a chute; 271-a first arcuate connecting section; 272-a second arcuate connecting section; 273-first U-shaped connecting section; 274-a second U-shaped connecting section; 281-first flexible connecting line; 282-second flexible connection line; 30-phase pole units; 32 a-a phase pole first stationary contact; 32 b-a phase pole second fixed contact; 33-phase pole contact support; 34 a-phase pole first moving contact; 34 b-phase pole second moving contact.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present utility model and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal," "vertical," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be connected between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

As shown in fig. 1, the present application provides an automatic transfer switch 100, which includes an operating mechanism 10, a plurality of phase pole units 30, and a neutral pole unit 20, so as to drive the plurality of phase pole units 30 and the neutral pole unit 20 to cooperate with each other to perform actions through the operating mechanism 10. Specifically, as shown in fig. 1, 5 to 7, the operating mechanism 10, the phase pole unit 30 and the neutral pole unit 20 are sequentially stacked, and the operating mechanism 10 is in transmission connection with the phase pole unit 30 and the neutral pole unit 20 through a driving shaft 11 of the neutral pole unit 20, for driving the phase pole unit 30 and the neutral pole unit 20 to rotate synchronously. Illustratively, in the present embodiment, the number of phase pole units 30 is three.

As shown in fig. 2 to 4 and 8, the neutral pole unit 20 includes a neutral pole unit housing 21, a first neutral pole fixed contact 22a and a second neutral pole fixed contact 22b fixedly disposed in the neutral pole unit housing 21, a driving shaft 11, a first neutral pole fixed contact support 23a and a second neutral pole fixed contact support 23b rotatably disposed in the neutral pole unit housing 21, a first neutral pole fixed contact 24a fixedly disposed on the first neutral pole fixed contact support 23a, a second neutral pole fixed contact 24b fixedly disposed on the second neutral pole fixed contact support 23b, and an elastic member 25 connected between the first neutral pole fixed contact support 23a and the second neutral pole fixed contact support 23b, so that the first neutral pole fixed contact 24a is opened and closed with the first neutral pole fixed contact 22a by the first neutral pole fixed contact support 23a, and the second neutral pole fixed contact 24b is opened and closed with the second neutral pole fixed contact 22b by the second neutral pole fixed contact support 23 b.

As shown in fig. 3 to 7, the neutral pole unit 20 has a neutral pole first state (as shown in fig. 5 and 9) in which the neutral pole first moving contact 24a and the neutral pole first fixed contact 22a are opened and the neutral pole second moving contact 24b and the neutral pole second fixed contact 22b are closed, a neutral pole second state (as shown in fig. 6 and 10) in which the neutral pole first moving contact 24a and the neutral pole first fixed contact 22a are closed and the neutral pole second moving contact 24b and the neutral pole second fixed contact 22b are closed, and a neutral pole third state (as shown in fig. 7) in which the neutral pole first moving contact 24a and the neutral pole second fixed contact 22a are closed, so that the neutral pole unit 20 of the automatic transfer switch 100 is switched between the first power source and the second power source, thereby providing uninterrupted power for a load and further guaranteeing the continuity of power supply.

As shown in fig. 3, 4 and 8, the first contact support 23a and the second contact support 23b are coaxially and stacked along the axial direction of the driving shaft 11, and the elastic member 25 provides a tensile force to the first contact support 23a and the second contact support 23b along the direction of the arrangement so that the first contact support 23a and the second contact support 23b have a movement tendency toward each other along the direction of rotation thereof to drive the first moving contact 24a to have a movement tendency to close with the first fixed contact 22a and the second moving contact 24b to close with the second fixed contact 22 b. As shown in fig. 3 to 7, the drive shaft 11 can act on the neutral pole first contact support 23a and the neutral pole second contact support 23b, respectively, when rotating, so that the neutral pole unit 20 can be switched among the neutral pole first state, the neutral pole second state, and the neutral pole third state. The automatic transfer switch 100 can solve the problem that the neutral line of the load end is completely disconnected to cause zero line emptying phenomenon in the transfer process of the four-pole automatic transfer switch 100 in the prior art.

Specifically, as shown in fig. 3 to 5 and 9, when the neutral second moving contact 24b is in contact with the neutral second fixed contact 22b, the driving shaft 11 acts on the neutral first contact support 23a to make the neutral first contact support 23a overcome the movement tendency of the neutral first contact support 23a and the neutral second contact support 23b toward each other, so that the neutral first moving contact 24a is not in contact with the neutral first fixed contact 22a (i.e., the neutral first state) to make the neutral unit 20 be connected to the first power source and disconnected from the second power source; as shown in fig. 6 and 10, as the driving shaft 11 rotates, the first movable contact 24a of the neutral pole is driven by the first movable contact 23a of the neutral pole to move toward the first fixed contact 22a of the neutral pole, and when the first movable contact 24a of the neutral pole starts to contact with the first fixed contact 22a of the neutral pole, the second movable contact 24b of the neutral pole keeps contacting with the second fixed contact 22b of the neutral pole (i.e., the second state of the neutral pole), so that the neutral pole unit 20 is connected to both the first power source and the second power source; as shown in fig. 7, as the driving shaft 11 continues to rotate, the driving shaft 11 acts on the neutral electrode second contact support 23b, so that the neutral electrode second contact support 23b overcomes the movement trend of the neutral electrode first contact support 23a and the neutral electrode second contact support 23b, and the neutral electrode second contact support 23b drives the neutral electrode second moving contact 24b to move towards the second fixed contact 22b away from the neutral electrode, at this time, the neutral electrode first moving contact 24a and the neutral electrode first fixed contact 22a continue to keep in contact, and the neutral electrode second moving contact 24b and the neutral electrode second fixed contact 22b are out of contact (i.e. the neutral electrode third state), so that the neutral electrode unit 20 is disconnected from the first power supply and connected to the second power supply.

As described above, in the neutral pole unit 20 provided by the present application, during the switching process from the phase pole unit 30 to the second power, the elastic member 25 provides the tension to the neutral pole first contact support 23a and the neutral pole second contact support 23b so as to have a movement tendency of approaching each other, and, as the operating mechanism 10 rotates, the neutral pole first contact support 23a and the neutral pole second contact support 23b are respectively acted on by the rotation of the driving shaft 11, so that the neutral pole unit 20 can be switched among the neutral pole first state, the neutral pole second state and the neutral pole third state, so as to ensure that at least one of the neutral pole unit 20 and the first power and the second power is switched on, thereby ensuring that the neutral line at the load end is always switched on but not completely switched off in the switching process of the automatic transfer switch 100, i.e., the output zero line of the automatic transfer switch 100 is always communicated with the zero line of the input power grid, thereby eliminating the potential safety hazard caused by the zero line empty phenomenon. Meanwhile, the neutral pole unit 20 has the advantages of simple structure, fewer parts, reliable action and large contact opening distance, and meets the design requirements of miniaturization and modularization of products.

As shown in fig. 3, 4 and 8, in the present embodiment, the elastic member 25 may be a tension spring, the number of which is one, opposite ends of which are fixedly connected with the neutral pole first contact support 23a and the neutral pole second contact support 23b, respectively, the tension spring providing tension to the neutral pole first contact support 23a and the neutral pole second contact support 23b in the arrangement direction thereof so that the neutral pole first contact support 23a and the neutral pole second contact support 23b have a moving tendency toward each other in the rotation direction thereof. It should be noted that, in the drawings, the opposite ends of the tension spring cannot always be in a fixed connection relationship with the neutral pole first contact support 23a and the neutral pole second contact support 23b, and the solution should be understood based on the text description herein due to the limitation of the illustration of the drawings.

Of course, in other embodiments, the tension spring may be replaced by two compression springs, where one end of each compression spring is fixed on the neutral pole unit housing 21, the other end of one compression spring is fixedly connected with the first neutral pole contact support 23a, and the other end of the other compression spring is fixedly connected with the second neutral pole contact support 23b, so that the first neutral pole contact support 23a and the second neutral pole contact support 23b have a movement tendency close to each other along the rotation direction thereof. In addition, it should be noted that, when the elastic member 25 adopts the design form of the compression spring, the principle of the driving shaft 11 acting on the first contact support 23a of the neutral pole and the second contact support 23b of the neutral pole to switch the first power supply and the second power supply is substantially the same as the principle of the driving shaft 11 acting on the first contact support 23a of the neutral pole and the second contact support 23b of the neutral pole to switch the first power supply and the second power supply when the elastic member 25 adopts the design form of the tension spring, so that the description thereof is omitted here.

As shown in fig. 1 and fig. 5 to fig. 7, the phase pole unit 30 includes a phase pole unit 30 housing, a phase pole first fixed contact 32a and a phase pole second fixed contact 32b fixedly disposed in the phase pole unit 30 housing, a phase pole contact support 33 rotatably disposed in the phase pole unit 30 housing, and a phase pole first moving contact 34a and a phase pole second moving contact 34b fixedly disposed on the phase pole contact support 33, so that the phase pole first moving contact 34a and the phase pole first fixed contact 32a and the phase pole second moving contact 34b are driven to be opened and closed by the phase pole contact support 33.

As shown in fig. 5 to 7, the phase pole unit 30 has a phase pole first state (as shown in fig. 5) in which the phase pole first moving contact 34a and the phase pole first fixed contact 32a are opened and the phase pole second moving contact 34b and the phase pole second fixed contact 32b are closed, a phase pole second state (as shown in fig. 6) in which the phase pole first moving contact 34a and the phase pole first fixed contact 32a are opened and the phase pole second moving contact 34b and the phase pole second fixed contact 32b are opened, and a phase pole third state (as shown in fig. 7) in which the phase pole first moving contact 34a and the phase pole first fixed contact 34b and the phase pole second fixed contact 32b are closed, so that the phase pole unit 30 of the automatic transfer switch 100 is switched between the first power source and the second power source, thereby providing uninterrupted power for a load and further guaranteeing continuity of power supply.

Specifically, as shown in fig. 5 to 7, the phase contact support 33 is rotatable in two directions about the rotation center, and when rotated counterclockwise, the phase first moving contact 34a and the phase first fixed contact 32a are not in contact, and the phase second moving contact 34b and the phase second fixed contact 32b are in contact (i.e., the phase first state) to connect and disconnect the phase unit 30 from the first power supply; when rotated clockwise, the phase pole first moving contact 34a and the phase pole first fixed contact 32a are in contact, and the phase pole second moving contact 34b and the phase pole second fixed contact 32b are not in contact (i.e., the phase pole second state), so that the phase pole unit 30 is disconnected from the first power source and is connected to the second power source.

As shown in fig. 5 to 7, the phase pole first state and the neutral pole first state, the phase pole second state and the neutral pole second state, and the phase pole third state and the neutral pole third state correspond to each other, respectively. It should be noted that, the neutral-pole overlap time in the neutral-pole second state (i.e., the neutral-pole first moving contact 24a and the neutral-pole first fixed contact 22a are closed and the neutral-pole second moving contact 24b and the neutral-pole second fixed contact 22b are closed) is shorter than the phase-pole breaking time in the phase-pole second state (i.e., the phase-pole first moving contact 34a and the phase-pole first fixed contact 32a are opened and the phase-pole second moving contact 34b and the phase-pole second fixed contact 32b are opened).

As shown in fig. 5 to 7, the automatic transfer switch 100 has a first operation position and a second operation position, and when the automatic transfer switch 100 is switched between the first operation position and the second operation position, the phase pole unit 30 and the neutral pole unit 20 are respectively connected to or disconnected from the first power source and the second power source. Specifically, as shown in fig. 5, when the automatic transfer switch 100 is in the first working position, the phase pole second moving contact 34b and the phase pole second fixed contact 32b are in contact, the phase pole first moving contact 34a and the phase pole first fixed contact 32a are not in contact, the neutral pole second moving contact 24b is in contact with the neutral pole second fixed contact 22b, and the neutral pole first moving contact 24a is not in contact with the neutral pole first fixed contact 22a (i.e., the phase pole first state corresponds to the neutral pole first state), so that the automatic transfer switch 100 is connected to the first power source and disconnected from the second power source; when the automatic transfer switch 100 is switched from the first operating position to the second operating position, the phase pole second moving contact 34b and the phase pole second fixed contact 32b are separated from contact first, then the neutral pole first moving contact 24a is contacted with the neutral pole first fixed contact 22a, at this time, the neutral pole second moving contact 24b is kept in contact with the neutral pole second fixed contact 22b (i.e., the phase pole second state corresponds to the neutral pole second state), the state is generally referred to as a neutral line overlapping state by a person skilled in the art, the starting time of the neutral line overlapping state is the start point of the idle stroke of the driving shaft 11, and as the automatic transfer switch 100 is continuously switched from the first operating position to the second operating position, the phase pole first moving contact 34a and the phase pole first fixed contact 32a are firstly contacted, then the neutral pole second moving contact 24b is separated from contact with the neutral pole second fixed contact 22b, at this time, and the idle stroke of the driving shaft 11 is ended, this time is the end point of the idle stroke of the driving shaft 11; as shown in fig. 7, when the automatic transfer switch 100 reaches the second operating position, the phase pole first moving contact 34a and the phase pole first fixed contact 32a are in contact, the phase pole second moving contact 34b and the phase pole second fixed contact 32b are not in contact, the neutral pole first moving contact 24a is in contact with the neutral pole first fixed contact 22a, and the neutral pole second moving contact 24b is not in contact with the neutral pole second fixed contact 22b (i.e., the phase pole third state corresponds to the neutral pole third state), so that the automatic transfer switch 100 is disconnected from the first power source and is connected to the second power source.

As described above, according to the automatic transfer switch 100 provided by the present application, the neutral pole overlap time in the neutral pole second state (i.e., the neutral pole first moving contact 24a and the neutral pole first fixed contact 22a are closed and the neutral pole second moving contact 24b and the neutral pole second fixed contact 22b are closed) is shorter than the phase pole breaking time in the phase pole second state (i.e., the phase pole first moving contact 34a and the phase pole first fixed contact 32a are opened and the phase pole second moving contact 34b and the phase pole second fixed contact 32b are opened), so as to ensure that when the phase pole unit 30 is disconnected from both the first power source and the second power source, the neutral pole unit 20 is connected to at least one of the first power source and the second power source, thereby ensuring that the load end neutral line is always connected but not completely disconnected in the transfer process of the automatic transfer switch 100, i.e., the output neutral line of the automatic transfer switch 100 is always connected to the zero line of the input power grid, thereby eliminating the potential safety hazard caused by the zero line emptying phenomenon.

As shown in fig. 4 and 8, in the present embodiment, an opening/closing drive block 111 is provided on the peripheral wall of the drive shaft 11, and the opening/closing drive block 111 includes a first contact surface 111a and a second contact surface 111b that are provided opposite to each other, the first contact surface 111a being for abutting against the neutral pole first contact support 23a, and the second contact surface 111b being for abutting against the neutral pole second contact support 23 b. Correspondingly, as shown in fig. 8, the first contact support 23a of the neutral pole is provided with a first abutting surface 23a1, and when the first abutting surface 23a1 abuts against the first contact surface 111a, the neutral pole unit 20 is switched between a neutral pole first state and a neutral pole second state; the neutral pole second contact support 23b is provided with a second abutting surface 23b1, and when the second abutting surface 23b1 abuts against the second contact surface 111b, the neutral pole unit 20 is switched between the neutral pole second state and the neutral pole third state.

As shown in fig. 3, 4 and 8, the first receiving groove is formed in the first contact support 23a of the neutral pole, the second receiving groove is formed in the second contact support 23b of the neutral pole, and the first receiving groove and the second receiving groove are mutually buckled to form a receiving chute 27 for receiving the opening and closing driving block 111, so that after the first contact support 23a of the neutral pole and the second contact support 23b of the neutral pole are coaxially and stacked, the opening and closing driving block 111 can be received in the receiving chute 27 and respectively act on the first contact support 23a of the neutral pole and the second contact support 23b of the neutral pole when rotating.

Specifically, as shown in fig. 4 and 11, the accommodating slide groove 27 includes a first arc-shaped connection section 271 protruding toward the neutral-pole first fixed contact 22a and the neutral-pole second fixed contact 22b, a second arc-shaped connection section 272 protruding away from the neutral-pole first fixed contact 22a and the neutral-pole second fixed contact 22b, a first U-shaped connection section 273 recessed toward the neutral-pole first movable contact 24a and connecting one end of the first arc-shaped connection section 271 and one end of the second arc-shaped connection section 272, and a second U-shaped connection section 274 recessed toward the neutral-pole second movable contact 24b and connecting the other end of the first arc-shaped connection section 271 and the other end of the second arc-shaped connection section 272; the first abutting surface 23a1 is located on a folding arm surface of the first U-shaped connecting section 273, which is close to the first arc-shaped connecting section 271, and/or on a folding arm surface of the second U-shaped connecting section 274, which is close to the second arc-shaped connecting section 272, and the second abutting surface 23b1 is located on a folding arm surface of the first U-shaped connecting section 273, which is close to the second arc-shaped connecting section 272, and/or on a folding arm surface of the second U-shaped connecting section 274, which is close to the first arc-shaped connecting section 271.

As illustrated in fig. 4 and 11, in the present embodiment, the number of the opening/closing driving blocks 111 is two, the two opening/closing driving blocks 111 are rotationally symmetrical along the axial direction of the driving shaft 11, and correspondingly, the number of the first abutting surfaces 23a1 and the second abutting surfaces 23b1 are two, the two first abutting surfaces 23a1 are rotationally symmetrical along the axial direction of the driving shaft 11, at this time, the two first abutting surfaces 23a1 are respectively located on the folding arm surfaces of the first U-shaped connecting section 273 near the first arc-shaped connecting section 271 and the folding arm surfaces of the second U-shaped connecting section 274 near the second arc-shaped connecting section 272, the two second abutting surfaces 23b1 are rotationally symmetrical along the axial direction of the driving shaft 11, at this time, the second abutting surfaces 23b1 are located on the folding arm surfaces of the first U-shaped connecting section 273 near the second arc-shaped connecting section 272 and the folding arm surfaces of the second U-shaped connecting section 274 near the first arc-shaped connecting section 271, so as to further enhance the uniform force of the driving shaft 11 acting on the neutral pole support contacts 23a and the neutral pole support 23b, respectively.

As shown in fig. 3, 4 and 8, a first connecting lug 23a6 is provided on the first contact support 23a of the neutral pole, a second connecting lug 23b6 is provided on the second contact support 23b of the neutral pole, the first connecting lug 23a6 and the second connecting lug 23b6 are oppositely arranged, and opposite ends of the elastic member 25 are respectively connected with the first connecting lug 23a6 and the second connecting lug 23b 6. The first connection lug 23a6 is disposed on a side of the first moving contact 24a of the neutral pole, which is close to the first fixed contact 22a of the neutral pole, and the second connection lug 23b6 is disposed on a side of the second moving contact 24b of the neutral pole, which is close to the second fixed contact 22b of the neutral pole, so that the elastic member 25 is connected with the first connection lug 23a6 and the second connection lug 23b6 and provides a tensile force, and meanwhile, interference between the elastic member 25 and the first moving contact 24a of the neutral pole and the second moving contact 24b of the neutral pole can be avoided.

As shown in fig. 9 and 10, in the present embodiment, when the neutral pole unit 20 is switched between the neutral pole first state and the neutral pole second state, the rotation angle of the driving shaft 11 is a, the opening angle between the neutral pole first moving contact 24a and the neutral pole first fixed contact 22a is b, the angle between the first contact surface 111a and the second contact surface 111b is c, the idle stroke angle of the driving shaft 11 is d, and the following relationship is satisfied: b=a+c/2-d.

Regarding the rotation angle of the driving shaft 11, the angle between the first contact surface 111a and the second contact surface 111b (or the width of the opening/closing driving block 111), and the idle stroke angle of the driving shaft 11, those skilled in the art should be able to reasonably select and design according to practical situations, and only need to increase the contact opening distance as much as possible on the premise of ensuring the reliability of the product, which is not particularly limited herein.

As shown in fig. 3, 4 and 8, in the present embodiment, the neutral pole unit 20 further includes a fastener 26, a mounting hole is provided on the first neutral contact support 23a, a connection hole 24a1 is provided on the first neutral contact 24a, and the fastener 26 sequentially penetrates through the mounting hole and the connection hole 24a1, so that the first neutral contact 24a is fixedly connected with the first neutral contact support 23 a. It should be noted that the second movable contact 24b of the neutral electrode and the second contact support 23b of the neutral electrode may be connected in the same fixed connection manner, which is not described herein.

As shown in fig. 4 and 8, in the present embodiment, the mounting groove 23a3 is provided on the first neutral contact support 23a, the first neutral moving contact 24a is fixedly accommodated in the mounting groove 23a3, the first limiting portion 23a4 is provided in the mounting groove 23a3, the second limiting portion 24a2 is provided on the first neutral moving contact 24a, and the first limiting portion 23a4 and the second limiting portion 24a2 cooperate with each other to limit the relative movement between the first neutral moving contact 24a and the mounting groove 23a3, so that the acting force is large when the first neutral moving contact 24a contacts the first neutral fixed contact 22a, and the first neutral moving contact 24a is prevented from moving in the mounting groove 23a 3. In addition, a plurality of reinforcing ribs 23a5 can be arranged on one side of the side wall of the mounting groove 23a3 far away from the contact, so as to avoid the side wall of the mounting groove 23a3 from being broken due to the large acting force when the neutral pole first movable contact 24a is contacted with the neutral pole first fixed contact 22 a. In this embodiment, the first limiting portion 23a4 may be a protrusion and the second limiting portion 24a2 may be a groove, however, in other embodiments, the first limiting portion 23a4 may be a groove and the second limiting portion 24a2 may be a protrusion. In addition, it should be noted that the second movable contact 24b of the neutral electrode and the second contact support 23b of the neutral electrode may be limited in the same limiting manner, which is not described herein again.

As shown in fig. 3 and 4, the neutral pole unit 20 further includes a first flexible connection line 281 and a second flexible connection line 282, wherein the first movable contact 24a of the neutral pole is connected to one end of the first flexible connection line 281, the second movable contact 24b of the neutral pole is connected to one end of the second flexible connection line 282, and the other end of the first flexible connection line 281 and the other end of the second flexible connection line 282 form a connection end together and are connected to a load bus through the connection end so as to provide power to the load through the load bus.

As shown in fig. 3 and 4, the neutral pole unit 20 further includes two arc extinguishing chambers, one of which is located on a rotating path of the first moving contact 24a of the neutral pole relative to the first fixed contact 22a of the neutral pole and is used for extinguishing an arc generated between the first moving contact 24a of the neutral pole and the first fixed contact 22a of the neutral pole, and the other of which is located on a rotating path of the second moving contact 24b of the neutral pole relative to the second fixed contact 22b of the neutral pole and is used for extinguishing an arc generated between the second moving contact 24b of the neutral pole and the second fixed contact 22b of the neutral pole, so as to further improve the safety performance of the automatic transfer switch 100.

As shown in fig. 2, in the present embodiment, the neutral pole unit housing 21 is provided with a state identifier 211 corresponding to the neutral pole first state, the neutral pole second state and the neutral pole third state, the driving shaft 11 is provided with an indication identifier 112, and the driving shaft 11 is driven to rotate relative to the neutral pole unit housing 21, so that the indication identifier 112 is aligned with the indication identifiers 112 corresponding to the neutral pole first state, the neutral pole second state and the neutral pole third state, respectively, so that a user can quickly identify the corresponding states. It should be noted that the specific shapes of the status indicator 211 and the indication indicator 112 in the drawings are for illustrative purposes only and are not intended to be limiting.

The above description is only of alternative embodiments of the present utility model and is not intended to limit the present utility model, and various modifications and variations will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further.

Claims (13)

1. A neutral pole unit characterized by comprising a neutral pole unit housing (21), a neutral pole first fixed contact (22 a) and a neutral pole second fixed contact (22 b) fixedly arranged in the neutral pole unit housing (21), a drive shaft (11), a neutral pole first contact support (23 a) and a neutral pole second contact support (23 b) rotatably arranged in the neutral pole unit housing (21), a neutral pole first movable contact (24 a) fixedly arranged on the neutral pole first contact support (23 a), a neutral pole second movable contact (24 b) fixedly arranged on the neutral pole second contact support (23 b), and an elastic member (25) connected between the neutral pole first contact support (23 a) and the neutral pole second contact support (23 b);

The neutral pole unit (20) has a neutral pole first state in which the neutral pole first moving contact (24 a) and the neutral pole first fixed contact (22 a) are opened and the neutral pole second moving contact (24 b) and the neutral pole second fixed contact (22 b) are closed, a neutral pole second state in which the neutral pole first moving contact (24 a) and the neutral pole first fixed contact (22 a) are closed and the neutral pole second moving contact (24 b) and the neutral pole second fixed contact (22 b) are closed, and a neutral pole third state in which the neutral pole first moving contact (24 a) and the neutral pole first fixed contact (22 a) are closed and the neutral pole second moving contact (24 b) and the neutral pole second fixed contact (22 b) are opened;

the first neutral contact support (23 a) and the second neutral contact support (23 b) are coaxially and stacked along the axial direction of the driving shaft (11), the elastic member (25) provides a pulling force to the first neutral contact support (23 a) and the second neutral contact support (23 b) along the setting direction so that the first neutral contact support (23 a) and the second neutral contact support (23 b) have a movement trend of approaching each other along the rotating direction, and the driving shaft (11) can respectively act on the first neutral contact support (23 a) and the second neutral contact support (23 b) when rotating so as to switch the neutral pole unit (20) among the first neutral pole state, the second neutral pole state and the third neutral pole state.

2. The neutral pole unit according to claim 1, characterized in that an opening and closing drive block (111) is provided on a peripheral wall of the drive shaft (11), the opening and closing drive block (111) comprising a first contact surface (111 a) and a second contact surface (111 b) which are oppositely provided, the first contact surface (111 a) being adapted to abut against the neutral pole first contact support (23 a), the second contact surface (111 b) being adapted to abut against the neutral pole second contact support (23 b).

3. The neutral pole unit according to claim 2, characterized in that the neutral pole first contact support (23 a) is provided with a first abutment surface (23 a 1), the neutral pole unit (20) being switched between the neutral pole first state and the neutral pole second state when the first abutment surface (23 a 1) abuts against the first contact surface (111 a);

the neutral pole second contact support (23 b) is provided with a second abutting surface (23 b 1), and when the second abutting surface (23 b 1) abuts against the second contact surface (111 b), the neutral pole unit (20) is switched between the neutral pole second state and the neutral pole third state.

4. A neutral pole unit according to claim 3, characterized in that the first neutral pole contact support (23 a) is provided with a first receiving groove, the second neutral pole contact support (23 b) is provided with a second receiving groove, and the first receiving groove and the second receiving groove are mutually buckled to form a receiving chute (27) for receiving the opening and closing driving block (111).

5. The neutral pole unit as claimed in claim 4, characterized in that the receiving chute (27) comprises a first arc-shaped connecting section (271) protruding towards the first neutral pole stationary contact (22 a) and the second neutral pole stationary contact (22 b), a second arc-shaped connecting section (272) protruding away from the first neutral pole stationary contact (22 a) and the second neutral pole stationary contact (22 b), a first U-shaped connecting section (273) recessed towards the first neutral pole movable contact (24 a) and connecting one end of the first arc-shaped connecting section (271) and one end of the second arc-shaped connecting section (272), and a second U-shaped connecting section (274) recessed towards the second neutral pole movable contact (24 b) and connecting the other end of the first arc-shaped connecting section (271) and the other end of the second arc-shaped connecting section (272);

the first abutting surface (23 a 1) is located on a folding arm surface of the first U-shaped connecting section (273) close to the first arc-shaped connecting section (271) and/or on a folding arm surface of the second U-shaped connecting section (274) close to the second arc-shaped connecting section (272), and the second abutting surface (23 b 1) is located on a folding arm surface of the first U-shaped connecting section (273) close to the second arc-shaped connecting section (272) and/or on a folding arm surface of the second U-shaped connecting section (274) close to the first arc-shaped connecting section (271).

6. The neutral pole unit according to claim 1, wherein a first connection lug (23 a 6) is provided on the neutral pole first contact support (23 a), a second connection lug (23 b 6) is provided on the neutral pole second contact support (23 b), the first connection lug (23 a 6) and the second connection lug (23 b 6) are arranged in an opposite manner, and opposite ends of the elastic member (25) are respectively connected with the first connection lug (23 a 6) and the second connection lug (23 b 6).

7. The neutral pole unit according to claim 6, wherein the first connection lug (23 a 6) is disposed on a side of the first movable contact (24 a) of the neutral pole, which is close to the first stationary contact (22 a) of the neutral pole, and the second connection lug (23 b 6) is disposed on a side of the second movable contact (24 b) of the neutral pole, which is close to the second stationary contact (22 b) of the neutral pole.

8. The neutral pole unit according to claim 2, characterized in that, when the neutral pole unit (20) is switched between the neutral pole first state and the neutral pole second state, the rotation angle of the drive shaft (11) is a, the opening angle between the neutral pole first moving contact (24 a) and the neutral pole first stationary contact (22 a) is b, the angle between the first contact surface (111 a) and the second contact surface (111 b) is c, the idle stroke angle of the drive shaft (11) is d, and the following relation is satisfied: b=a+c/2-d.

9. The neutral pole unit according to claim 1, further comprising a fastener (26), wherein a mounting hole is provided on the first neutral pole contact support (23 a), a connecting hole (24 a 1) is provided on the first neutral pole moving contact (24 a), and the fastener (26) is sequentially inserted into the mounting hole and the connecting hole (24 a 1) so that the first neutral pole moving contact (24 a) is fixedly connected with the first neutral pole contact support (23 a).

10. The neutral pole unit according to claim 9, wherein a mounting groove (23 a 3) is provided on the first neutral pole contact support (23 a), the first neutral pole moving contact (24 a) is fixedly accommodated in the mounting groove (23 a 3), a first limiting portion (23 a 4) is provided in the mounting groove (23 a 3), a second limiting portion (24 a 2) is provided on the first neutral pole moving contact (24 a), and the first limiting portion (23 a 4) and the second limiting portion (24 a 2) are mutually matched to limit relative movement between the first neutral pole moving contact (24 a) and the mounting groove (23 a 3).

11. The neutral pole unit according to claim 1, further comprising a first flexible connection line (281) and a second flexible connection line (282), wherein the first movable contact (24 a) of the neutral pole is connected to one end of the first flexible connection line (281), the second movable contact (24 b) of the neutral pole is connected to one end of the second flexible connection line (282), and the other end of the first flexible connection line (281) and the other end of the second flexible connection line (282) form a connection end together and are connected to a load bus through the connection end.

12. The neutral pole unit according to claim 1, further comprising two arc extinguishing chambers, one of which is located on a rotational path in which the first movable neutral pole contact (24 a) rotates with respect to the first stationary neutral pole contact (22 a) for extinguishing an arc generated between the first movable neutral pole contact (24 a) and the first stationary neutral pole contact (22 a), and the other of which is located on a rotational path in which the second movable neutral pole contact (24 b) rotates with respect to the second stationary neutral pole contact (22 b) for extinguishing an arc generated between the second movable neutral pole contact (24 b) and the second stationary neutral pole contact (22 b).

13. An automatic transfer switch, characterized by comprising an operating mechanism (10), a plurality of phase pole units (30) and a neutral pole unit (20) according to any one of claims 1-12, wherein the operating mechanism (10), the phase pole units (30) and the neutral pole units (20) are sequentially stacked, and the operating mechanism (10) is in transmission connection with the phase pole units (30) and the neutral pole units (20) through a driving shaft (11) of the neutral pole units (20) and is used for driving the phase pole units (30) and the neutral pole units (20) to synchronously rotate.