CN213815863U - Double-power-supply change-over switch - Google Patents

Abstract

The utility model provides a dual supply change over switch. This dual supply change-over switch includes: the device comprises a first phase pole static contact, a first neutral pole static contact, a second phase pole static contact, a second neutral pole static contact, a main shaft, a phase pole moving contact connected with the main shaft, and a neutral pole moving contact. When the main shaft is located at the first position, the phase pole moving contact is contacted with the first phase pole fixed contact, and the neutral pole moving contact is contacted with the first neutral pole fixed contact; when the main shaft is located at the second position, the phase pole moving contact is in contact with the second phase pole fixed contact, and the neutral pole moving contact is in contact with the second neutral pole fixed contact. During the process of the main shaft from the first position to the second position, the motion process of the neutral pole moving contact comprises a first stage and a second stage: in the first stage, the neutral pole moving contact keeps static and is only contacted with the first neutral pole fixed contact; in the second stage, the neutral pole moving contact realizes the overlapping conversion from the first neutral pole fixed contact to the second neutral pole fixed contact.

Description

Double-power-supply change-over switch

Technical Field

The utility model relates to an electrical switch technical field specifically, relates to a dual supply change over switch.

Background

With the continuous and deep requirements of people on power supply continuity, safety and reliability, the application of the dual power transfer switch (ATS) is more and more extensive. For example, in power utilization places such as data centers, hotels, theaters and the like, emergency power supplies are generally required to be provided to ensure the continuity of power supply, and the dual-power transfer switch can realize rapid switching between a common power supply and a standby power supply to ensure the continuity of power supply.

During the power transfer, if the neutral line is temporarily disconnected as the other phase lines, the voltage of the consumer will fluctuate and cause adverse effects and losses. For example, during a dual power transfer process in a data center, a short disconnection of the neutral line may raise the power supply voltage to zero and cause a server restart, with serious consequences such as data loss or server damage.

The prior art has a neutral line overlapping switching technology, and the neutral line can be connected with at least one of the neutral lines of a common power supply or a standby power supply in the power supply conversion process, so that the neutral line is prevented from being suspended. However, in the existing neutral line overlapping switching process, there may be a situation that the neutral lines of the two power supplies are connected for a long time, so that malfunction of the upper-level leakage sensor and stray current are caused, which is not beneficial to the safety of the power supply system.

SUMMERY OF THE UTILITY MODEL

An embodiment of the utility model provides a dual power transfer switch can avoid the neutral line suspension and prevent that the neutral pole from overlapping for a long time at power conversion in-process to promote power supply system's stability. In addition, the dual-power transfer switch also has the advantages of high short-time tolerance, simple structure and convenience in assembly.

An embodiment of the utility model provides a dual power transfer switch, include: the first phase pole static contact and the first neutral pole static contact are used for being connected with the first power supply; the second phase pole static contact and the second neutral pole static contact are used for being connected with the second power supply; the phase pole switching mechanism comprises a main shaft and a phase pole moving contact, the main shaft can be arranged in a rotating mode, and the phase pole moving contact is connected with the main shaft and can rotate under the driving of the main shaft so as to switch between the first phase pole fixed contact and the second phase pole fixed contact; and the neutral pole switching mechanism comprises a neutral pole moving contact, is connected with the main shaft and can move under the driving of the main shaft so as to switch the neutral pole moving contact between the first neutral pole fixed contact and the second neutral pole fixed contact. When the main shaft is located at the first position, the phase pole moving contact is in contact with the first phase pole fixed contact, the neutral pole moving contact is in contact with the first neutral pole fixed contact, and the first power supply is switched on; when the main shaft is located at the second position, the phase pole moving contact is in contact with the second phase pole fixed contact, the neutral pole moving contact is in contact with the second neutral pole fixed contact, and the second power supply is switched on. During the process of the main shaft converting from the first position to the second position, the motion process of the neutral pole moving contact comprises a first stage and a second stage: in the first stage, the neutral pole moving contact is kept static and is only contacted with the first neutral pole fixed contact; in the second stage, the neutral pole moving contact is switched from being in contact with only the first neutral pole fixed contact to being in contact with only the second neutral pole fixed contact, and the neutral pole moving contact is always in contact with at least one of the first neutral pole fixed contact and the second neutral pole fixed contact in the switching process.

In some examples, during the transition of the main shaft from the second position to the first position, the movement process of the neutral pole moving contact includes a third phase and a fourth phase: in a third phase, the neutral pole moving contact is switched from being in contact with only the second neutral pole fixed contact to being in contact with only the first neutral pole fixed contact, and the neutral pole moving contact is always in contact with at least one of the first neutral pole fixed contact and the second neutral pole fixed contact in the switching process; in the fourth stage, the neutral pole moving contact is kept static and is only contacted with the first neutral pole fixed contact.

In some examples, the spindle further has a stable third position between the first position and the second position. When the main shaft is located at the third position, the phase pole moving contact is not in contact with the first phase pole fixed contact and the second phase pole fixed contact, the neutral pole moving contact is only in contact with the first neutral pole fixed contact, and the phase poles of the first power supply and the second power supply are both disconnected. The process of switching from the first position to the third position corresponds to the first stage, the process of switching from the third position to the second position corresponds to the second stage, the process of switching from the second position to the third position corresponds to the third stage, and the process of switching from the third position to the first position corresponds to the fourth stage.

In some examples, the main shaft is provided with a first contact portion, and the neutral pole conversion mechanism further comprises: the first end of the driving rod is hinged to the main shaft, the second end of the driving rod is movably connected with the first end of the neutral pole moving contact and can drive the second end of the neutral pole moving contact to switch between a first neutral pole static contact and a second neutral pole static contact, a second contact part is arranged on the driving rod and located between the first end and the second end of the driving rod, and the second contact part is configured to be separated from or in contact fit with the first contact part; and a first elastic component connected to the neutral pole moving contact and used for driving the neutral pole moving contact to deflect towards the position contacted with the first neutral pole fixed contact. In the first stage, the first contact part and the second contact part are in a separated state; in the second stage, the first contact part presses the second contact part and drives the driving rod to rotate, so that the neutral pole moving contact is driven to rotate; in the third phase, the first elastic component drives the neutral pole moving contact to rotate; in the fourth stage, the first contact portion and the second contact portion are in a separated state.

In some examples, the first end of the neutral pole moving contact is hinged to the second end of the driving rod through a first pin, and the first end of the neutral pole moving contact is provided with a first sliding groove in which the first pin can slide.

In some examples, the first elastic component includes a first spring, a first spring holder, and a second pin, the first spring holder is hinged to the neutral pole moving contact, a second sliding groove is provided on the first spring holder, the second pin is fixedly disposed and located in the second sliding groove, the first spring is sleeved outside the first spring holder, a first end of the first spring abuts against the second pin, and a second end of the first spring abuts against a limiting surface of the first spring holder.

In some examples, the moment of action of the first spring on the movable neutral pole contact when the main shaft is in the first position is substantially equal to the moment of action of the first spring on the movable neutral pole contact when the main shaft is in the second position.

In some examples, the neutral pole moving contact includes two metal sheets arranged side by side, the first neutral pole fixed contact and the second neutral pole fixed contact are located between the two metal sheets, and the dual power transfer switch further includes a second elastic component, and the two metal sheets maintain contact pressure with the first neutral pole fixed contact and/or the second neutral pole fixed contact through the second elastic component.

In some examples, the second elastic component includes a second spring holder, a second spring, and a third pin, the third pin passes through the two metal sheets, and the second spring is sleeved outside the third pin and between the two metal sheets and a wall surface of the second spring holder.

In some examples, the phase pole moving contact includes a first end and a second end, the first end of the phase pole moving contact is configured to switch between the first phase pole stationary contact or the second phase pole stationary contact, and the second end of the phase pole moving contact is configured to connect to a load.

In some examples, the first and second stationary neutral pole contacts are proximate to and insulated from each other.

In some examples, the neutral switching mechanism further includes a neutral outlet terminal in contact with the neutral movable contact.

Drawings

In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings of the embodiments will be briefly described below.

It is to be understood that the drawings in the following description are directed to only some embodiments of the invention and are not intended as limitations of the invention.

Fig. 1 is a schematic diagram of a three-dimensional structure of a dual power transfer switch according to an embodiment of the present invention;

fig. 2A is a schematic diagram of another three-dimensional structure of a dual power transfer switch according to an embodiment of the present invention;

fig. 2B is a schematic diagram of a partial structure of a dual power transfer switch according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a planar structure of a dual power transfer switch according to an embodiment of the present invention;

4-6 are schematic structural diagrams of different states of the dual power transfer switch during the transfer process;

FIG. 7 is a schematic view of the first resilient member when the spindle is in the first position;

FIG. 8 is a schematic view of the first resilient member with the spindle in a second position;

FIG. 9 is a schematic structural view of a neutral pole switching mechanism;

FIG. 10 is a schematic three-dimensional structure corresponding to FIG. 9;

FIG. 11 is a view taken along the line A-A in FIG. 9;

FIG. 12 is a view taken along the line B-B in FIG. 9; and

FIG. 13 is a timing diagram of a dual power transfer switch transitioning between a first position, a second position, and a third position.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be obtained by a person skilled in the art without any inventive work based on the described embodiments of the present invention, belong to the protection scope of the present invention.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which the invention belongs.

An embodiment of the utility model provides a dual power transfer switch is configured to change between two power supplies. The dual power transfer switch will be described in detail below with reference to the accompanying drawings.

Fig. 1 is a schematic diagram of a three-dimensional structure of a dual power transfer switch according to an embodiment of the present invention. As shown in fig. 1, the dual power transfer switch includes: the first phase pole static contact 101 and the first neutral pole static contact 201 are used for connecting a first power supply; and a second stationary phase pole contact 102 and a second stationary neutral pole contact 202 for connection to a second power source. For example, the first power source and the second power source may be a regular power source and a backup power source, respectively.

For example, the first power source and the second power source may be three-phase alternating currents, as shown in fig. 1, the number of the first phase-pole fixed contact 101 and the number of the second phase-pole fixed contact 102 are three, and the three phase-pole fixed contacts are respectively connected to three phase lines of the first power source and the three phase-pole fixed contacts of the second power source. The first and second fixed neutral contacts 201 and 202 are respectively connected to the neutral lines of the first and second power supplies.

For example, as shown in fig. 1, the dual power transfer switch further includes a phase transfer mechanism 300, and the phase transfer mechanism 300 includes a main shaft 301 and a phase electrode moving contact 302. The main shaft 301 is rotatably disposed, and the phase moving contact 302 is connected to the main shaft 301 and can be driven by the main shaft 301 to rotate so as to switch between the first phase fixed contact 101 and the second phase fixed contact 102 or stay at an intermediate position between the first phase fixed contact 101 and the second phase fixed contact 102.

As shown in fig. 1, the number of the phase pole moving contacts 302 may also be three, and the three phase pole moving contacts correspond to the first phase pole fixed contact 101 and the second phase pole fixed contact 102 one by one. The first connection end 3021 of each phase pole moving contact 302 is used for switching between the corresponding first phase pole fixed contact 101 and second phase pole fixed contact 102, and the second connection end 3022 thereof is used for connecting a load.

The dual power transfer switch may also include a housing (not shown) for carrying and housing the various functional components. For example, the first phase pole static contact, the second phase pole static contact, the first neutral pole static contact, and the second neutral pole static contact may be fixedly disposed on the housing, and the main shaft may be rotatably disposed on the housing.

For example, as shown in fig. 1, a dual power transfer switch also includes a neutral switching mechanism 400, the neutral switching mechanism 400 including a neutral moving contact 401. The neutral pole switching mechanism 400 is connected to the main shaft 301 and can be driven by the main shaft 301 to move so that the neutral pole moving contact 401 is switched between the first neutral pole fixed contact 201 and the second neutral pole fixed contact 202.

Fig. 2A is another schematic three-dimensional structure diagram of a dual power transfer switch, fig. 2B is a schematic partial structure diagram of the dual power transfer switch, and fig. 3 is a schematic plan structure diagram of the dual power transfer switch. As shown in fig. 2A and 3, the neutral pole conversion mechanism 400 further includes a drive lever 402 and a first elastic member 410. A first end 4021 of the driving rod 402 is hinged to the main shaft 301, and a second end 4022 of the driving rod 402 is movably connected to a first end 4011 of the neutral movable contact 401 and is capable of driving a second end 4012 (see fig. 3) of the neutral movable contact 401 to switch between the first neutral stationary contact 201 and the second neutral stationary contact 202.

For example, the first end 4021 of the drive rod 402 and the hinge axis of the main shaft 301 coincide with the central axis of the main shaft 301.

As shown in fig. 2B, the first stationary neutral pole contact 201 and the second stationary neutral pole contact 202 are close to each other and insulated from each other. For example, a gap is formed between the first fixed neutral pole contact 201 and the second fixed neutral pole contact 202, and the gap is smaller than the width of the movable neutral pole contact 401, and when the movable neutral pole contact 401 crosses the gap, the first fixed neutral pole contact 201 and the second fixed neutral pole contact 202 can be simultaneously conducted with the movable neutral pole contact 401, so that the neutral lines are overlapped.

As shown in fig. 2A and 2B, the neutral pole switching mechanism 400 further includes a neutral wire outlet terminal 404, and the neutral wire outlet terminal 404 is in contact with the neutral moving contact 401.

As shown in fig. 2A and 3, the main shaft 301 is provided with a first contact portion 3011, the driving rod 402 is provided with a second contact portion 4023, the second contact portion 4023 is located between the first end 4021 and the second end 4022 of the driving rod 402, and the second contact portion 4023 is configured to be separated from or in contact with the first contact portion 3011. The first contact portion 3011 and the second contact portion 4023 are separated or contacted with each other along with the rotation of the main shaft 301, and when the first contact portion 3011 contacts and presses the second contact portion 4023, a rotation moment can be applied to the neutral movable contact 402.

The first elastic member 410 is connected to the neutral moving contact 401 for driving the neutral moving contact 401 to deflect to the position of contacting with the first neutral stationary contact 201. For example, as shown in fig. 3, a first resilient member 410 may be connected to a first end 4011 of the neutral movable contact 401, the first resilient member 410 comprising a compression spring providing a pushing force to the first end 4011 of the neutral movable contact 401 to deflect the first end 4011 of the neutral movable contact 401 to the right and deflect a second end 4012 of the neutral movable contact 401 to the left, the second end 4012 remaining in contact with only the first neutral stationary contact 201 in the absence of an external force.

Fig. 3-6 are schematic diagrams of the switching process of the dual power transfer switch. As shown in fig. 3, the main shaft 301 has a stable first position S1, a second position S2, and a third position OFF. The main shaft 301 is a driving component of the dual power transfer switch, and can rotate in a direction shown by an arrow R (or can rotate in a reverse direction) in the figure, and drives the phase movable contact 302 and the neutral movable contact 401 to rotate, so that the dual power transfer switch is switched among a first position S1, a second position S2 and a third position OFF. Fig. 3-6 show different states of the dual power transfer switch when the main shaft 301 is rotated in the R direction. FIG. 3 shows the state of the dual power transfer switch in the first position S1, FIG. 4 shows the state of the dual power transfer switch in the third position OFF, FIG. 5 shows the state of the dual power transfer switch between the third position OFF and the second position S2, and FIG. 6 shows the state of the dual power transfer switch in the second position S2.

As shown in fig. 3, when the main shaft 301 is in the first position S1, the phase pole moving contact 302 is in contact with the first phase pole fixed contact 101, and the neutral pole moving contact 401 is in contact with the first neutral pole fixed contact 201, so that the first power source is turned on. As shown in fig. 4, when the main shaft 301 is in the third position OFF, the phase moving contact 302 is not in contact with the first phase stationary contact 101 and the second phase stationary contact 102, the neutral moving contact 401 is only in contact with the first neutral stationary contact 201, and the phases of the first power source and the second power source are both disconnected. As shown in fig. 6, when the main shaft 301 is in the second position, the phase moving contact 302 contacts the second phase stationary contact 102, and the neutral moving contact 401 contacts the second neutral stationary contact 202, so that the second power source is turned on.

As shown in fig. 3 to 6, during the transition of the main shaft 301 from the first position S1 to the second position S2 along the direction R, the movement process of the neutral pole moving contact 401 includes a first stage and a second stage: in a first phase, as shown in fig. 3-4, when the main shaft 301 rotates from the first position S1 to the third position OFF, the first contact portion 3011 is switched from the separated state with the second contact portion 4023 to the contact with the second contact portion 4023 (no force is generated on the second contact portion 4023), the neutral movable contact 401 remains stationary and is only in contact with the first neutral stationary contact 201, and the switch changes from the state of turning on the first power supply to the state of turning OFF the phase poles of the first power supply and the second power supply; in the second stage, as shown in fig. 4 to 6, when the main shaft 301 rotates from the third position OFF to the second position S2, the first contact portion 3011 contacts and presses the second contact portion 4023, so as to drive the driving rod 402 to rotate in the R direction, the driving rod 402 applies a rotational moment to the neutral moving contact 401, overcomes the thrust of the first elastic component, so as to drive the neutral moving contact 401 to rotate, so that the neutral moving contact 401 is switched from being in contact with only the first neutral stationary contact 201 (the state shown in fig. 4) to being in contact with only the second neutral stationary contact 202 (the state shown in fig. 6), and the switch is switched from the state of being disconnected from the phase poles of the first power source and the second power source to the state of being connected to the second power source.

During the second stage of the switching process, the neutral moving contact 401 is always in contact with at least one of the first neutral stationary contact 201 and the second neutral stationary contact 202. Therefore, the neutral line can be switched in an overlapping mode, namely, the neutral line is not suspended when the power supply is switched, so that voltage fluctuation of electric equipment is reduced or avoided, and safety is improved.

For example, as shown in fig. 5, during the second stage of the switching process, the neutral moving contact 401 may be in contact with the first neutral fixed contact 201 and the second neutral fixed contact 202 at the same time.

The main shaft 301 can also be rotated in the reverse direction, i.e., in the-R direction, to effect a transition from the second position S2 to the first position S1. The conversion process corresponds to the state shown in fig. 6 to the state shown in fig. 3, and the motion process of the neutral pole moving contact comprises a third stage and a fourth stage: in a third phase (from fig. 6 to fig. 4), during the rotation of the main shaft, the main shaft 301 rotates from the second position S2 to the third position OFF, and as the first contact portion 3011 releases the second contact portion 4023, the first elastic member 410 pushes the neutral moving contact 401 to rotate, so that the neutral moving contact 401 switches from being in contact with only the second neutral moving contact 202 to being in contact with only the first neutral moving contact 201, the switch changes from the state of switching on the second power supply to the state of switching OFF the first power supply and the phase poles of the second power supply, and the neutral moving contact 401 always contacts at least one of the first neutral moving contact 201 and the second neutral moving contact 202 during the switching; in the fourth phase (from fig. 4 to fig. 3), the neutral moving contact 401 remains stationary and is in contact only with the first neutral stationary contact 201.

As described above, the process of switching from the first position S1 to the third position OFF corresponds to the first stage, the process of switching from the third position OFF to the second position S2 corresponds to the second stage, the process of switching from the second position S2 to the third position OFF corresponds to the third stage, and the process of switching from the third position OFF to the first position S1 corresponds to the fourth stage.

In addition, the dashed arrows in fig. 3-6 show the flow direction of the neutral current in the respective states. In fig. 3 and 4, the neutral moving contact 401 is in contact with the first neutral fixed contact 201, and the current of the neutral line flows through the first neutral fixed contact 201; in fig. 5, the neutral pole moving contact 401 is simultaneously in contact with the first neutral pole fixed contact 201 and the second neutral pole fixed contact 202, and the current of the neutral line flows through the first neutral pole fixed contact 201 and the second neutral pole fixed contact 202; in fig. 6, the neutral moving contact 401 is in contact with the second neutral fixed contact 202, and the current of the neutral line flows through the second neutral fixed contact 202.

The embodiment of the utility model provides a in dual power transfer switch, also can not set up third position OFF, main shaft 301 has stable first position S1 and second position S2 promptly, and the main shaft rotates the in-process between first position S1 and second position S2 and does not stop in the position that figure 4 shows and can realize, need not change dual power transfer switch' S structure. In this way, during the transition of the main shaft 301 from the first position to the second position, as shown in fig. 3 to 6, the movement process of the neutral pole moving contact 401 also includes the first phase and the second phase: in the first phase, the neutral moving contact 401 remains stationary and is only in contact with the first neutral stationary contact 201; in the second phase, the neutral moving contact 401 is switched from being in contact with only the first neutral stationary contact 201 to being in contact with only the second neutral stationary contact 202, and the neutral moving contact 401 is always in contact with at least one of the first neutral stationary contact 201 and the second neutral stationary contact 202 during the switching process.

Therefore, when the main shaft has the stable first position S1, the second position S2 and the third position OFF, the dual power transfer switch provided by the embodiment of the present invention can be used as a three-position switch; when the main shaft has stable first position S1 and second position S2, the embodiment of the utility model provides a dual power change-over switch can regard as the duplex position switch to use.

In the first stage, the first contact portion and the second contact portion are in a separated state (as shown in fig. 4, the first contact portion and the second contact portion are in a separated stage when no force is generated immediately after the first contact portion and the second contact portion are in contact); in the second stage, the first contact part compresses the second contact part and drives the driving rod to rotate, so that the neutral pole moving contact is driven to rotate; in the third stage, the first elastic component drives the neutral pole moving contact to rotate; in the fourth stage, the first contact portion and the second contact portion are in a separated state.

The structure and movement principles of neutral pole switching mechanism 400 are further described below.

As shown in fig. 2A, a first end 4011 of the neutral moving contact 401 is hinged to a second end 4022 of the driving rod 402 by a first pin 403, the first end 4011 of the neutral moving contact 401 is provided with a first sliding slot 4013, and the first pin 403 can slide in the first sliding slot 4013, that is, the neutral moving contact 401 and the driving rod 402 can realize relative rotation and relative sliding at a connection position, so that the neutral moving contact and the driving rod can be prevented from generating motion interference.

Fig. 7 and 8 show a connection structure of the first elastic member to the neutral pole movable contact, fig. 7 shows a state of the first elastic member at the first position S1, and fig. 8 shows a state of the first elastic member at the second position S2.

As shown in fig. 7 and 8, the first elastic member 410 includes a first spring 411, a first spring holder 412, and a second pin 413. The first spring holder 412 is hinged to the neutral pole moving contact 401 through a pin. The first spring holder 412 is provided with a second slide groove 4121. The second pin 413 is fixedly disposed, for example, the second pin 413 may be fixedly disposed on the housing. The second pin 413 is located in the second sliding groove 4121, and the first spring holder 412 and the second pin 413 can slide relatively along the extending direction of the second sliding groove 4121. The first spring 411 is sleeved outside the first spring holder 412, a first end 4111 of the first spring 411 abuts against the second pin 413, and a second end 4112 of the first spring 411 abuts against the limiting surface 4122 of the first spring holder 412.

The first spring 411 may be a compression spring. In fig. 7, the first spring 411 is in a state of minimum compression, corresponding to a first position of the spindle of fig. 3; in fig. 8, the first spring 411 is in a state of maximum compression, corresponding to the second position of the spindle of fig. 6.

When the neutral pole moving contact 401 rotates, the first spring holder 412 is driven to move, and the second sliding groove 4121 of the first spring holder 412 can slide on the second pin 413. When the first end 4121a of the second sliding groove 4121 abuts against the second pin 413, the rotation of the neutral moving contact 401 in the clockwise direction (R direction) is limited, corresponding to the minimum compression state; when the second end 4121b of the second sliding groove 4121 abuts against the second pin 413, the position of the neutral movable contact 401 in the counterclockwise direction (-R direction) is limited, corresponding to the maximum compression state.

When the driving rod 402 does not drive the neutral moving contact 401, the neutral moving contact 401 may be maintained in the position shown in fig. 3 by the first spring 411, so that the neutral moving contact 401 is maintained in contact with only the first neutral stationary contact 201.

As shown in fig. 7, in the minimum compression state, the pushing force of the first spring 411 to the neutral pole moving contact 401 is F1, and the acting moment generated is F1 × L1; as shown in fig. 8, in the maximum compression state, the pushing force of the first spring 411 to the neutral pole contact 401 is F2, and the acting moment generated is F2 × L2. Clearly, F1< F2.

In some examples, by reasonable design calculation, L1> L2, and F1 × L1 ≈ F2 × L2, that is, the moment of action of the first spring on the neutral polar movable contact is substantially equal in the minimum compression state and the maximum compression state, and it can also be said that the moment of action of the first spring on the neutral polar movable contact when the main shaft is in the first position is substantially equal to the moment of action of the first spring on the neutral polar movable contact when the main shaft is in the second position. Due to the arrangement, when the main shaft is at any position, the movable contact can be driven to reset by proper moment without redundant moment; meanwhile, the load of the neutral pole can be reduced, namely, the requirement on the rotation energy of the main shaft is reduced. By arranging the first elastic component, the neutral pole moving contact can be prevented from oscillating nearby when the main shaft rotates to the third position, so that the neutral pole moving contact is prevented from being simultaneously contacted with the first neutral pole static contact and the second neutral pole static contact.

Fig. 9 is a schematic structural diagram of the neutral pole switching mechanism, showing the structures of the neutral pole moving contact, the first neutral pole fixed contact and the second neutral pole fixed contact; FIG. 10 is a schematic three-dimensional structure corresponding to FIG. 9; FIG. 11 is a view taken along the line A-A in FIG. 9; fig. 12 is a view taken along the direction B-B in fig. 9.

As shown in fig. 11, the neutral pole moving contact 401 includes two metal sheets 4010 arranged side by side. In the direction perpendicular to the thickness direction of the metal sheets, the first and second fixed neutral pole contacts 201 and 202 are located between the two metal sheets 4010, and the neutral line outlet terminal 404 is also located between the two metal sheets 4010.

As shown in fig. 9 and 11, the dual power transfer switch further includes a second elastic member 420, and the two metal sheets 4010 maintain contact pressure with the first and/or second neutral pole stationary contacts 201 and 202 through the second elastic member 420.

The second elastic member 420 includes a second spring holder 421, a second spring 422, and a third pin 423. The third pin 423 penetrates through the two metal sheets 4010 to fix it to the second spring holder 421. The second spring 422 is sleeved outside the third pin 423 and located between the two metal sheets 4010 and the wall surface of the second spring holder 421. Second spring 422 may be a compression spring to cause two metal sheets to press against first and second stationary neutral contacts 201 and 202, and neutral wire outlet 404 therebetween. The neutral moving contact 401 may rotate around the third pin 423 to achieve electrical connection with the first neutral stationary contact 201 and/or the second neutral stationary contact 202.

The embodiment of the utility model provides a dual supply change over switch can realize the in-process of changing between first power and second power, and the neutral pole moving contact contacts with one of first neutral pole static contact and the neutral pole static contact of second at least to avoid the neutral line suspension. In addition, under the state that the first power supply and the second power supply are disconnected from the phase poles, the neutral pole moving contact can be prevented from being simultaneously contacted with the first neutral pole static contact and the second neutral pole static contact, so that stray current is prevented from being generated, and the safety of a power supply system is improved.

Fig. 13 is a timing diagram of the transition of the dual power transfer switch between the first position, the second position, and the third position, where P1 represents the phase pole of the first power source, P2 represents the phase pole of the second power source, N1 represents the neutral pole of the first power source, N2 represents the neutral pole of the second power source, the upwardly convex positions of the rectangular waves of P1, P2, N1, and N2 represent on, and the flat position represents off. As shown in fig. 13, when the switch is switched from the third position OFF to the first position S1, the neutral pole of the first power source is always on, i.e. the neutral pole moving contact is always in contact with the first neutral pole fixed contact, the neutral pole of the first power source is switched from OFF to on, and the phase pole of the second power source is always OFF; when the first position S1 is switched to the third position OFF, the neutral pole of the first power source is always on, that is, the neutral pole moving contact is in contact with the first neutral pole fixed contact, the phase pole of the first power source is switched from on to OFF, and the phase pole of the second power source is always OFF; when the neutral pole moving contact is switched from the third position OFF to the second position S2, the neutral pole moving contact is in overlapped contact with the first neutral pole fixed contact and the second neutral pole fixed contact, and the overlapping time is t 1; when the second position S2 is switched to the third position OFF, the neutral moving contact is in overlapping contact with the first neutral stationary contact and the second neutral stationary contact, and the overlapping time is t 2.

Finally, it should be noted that the present invention is generally illustrated by one/a pair of components when describing the position of each component and the matching relationship therebetween, however, it should be understood by those skilled in the art that such position, matching relationship, etc. are also applicable to other components/other pairs of components.

The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention, which is defined by the appended claims.

Claims (12)

1. A dual power transfer switch configured to transfer between a first power source and a second power source, comprising:

a first phase pole static contact (101) and a first neutral pole static contact (201) for connecting the first power supply;

a second phase pole static contact (102) and a second neutral pole static contact (202) for connecting the second power supply;

the phase pole conversion mechanism (300) comprises a main shaft (301) and a phase pole moving contact (302), the main shaft (301) can be rotatably arranged, and the phase pole moving contact (302) is connected with the main shaft (301) and can be driven by the main shaft (301) to rotate so as to convert between the first phase pole fixed contact (101) and the second phase pole fixed contact (102); and

a neutral pole switching mechanism (400) comprising a neutral pole moving contact (401), wherein the neutral pole switching mechanism (400) is connected with the main shaft (301) and can move under the driving of the main shaft (301) so as to switch the neutral pole moving contact (401) between the first neutral pole fixed contact (201) and the second neutral pole fixed contact (202),

wherein the main shaft (301) has a stable first position (S1) and a second position (S2), when the main shaft (301) is in the first position (S1), the phase pole moving contact (302) is in contact with the first phase pole fixed contact (101), the neutral pole moving contact (401) is in contact with the first neutral pole fixed contact (201), and the first power supply is switched on; when the main shaft (301) is at the second position (S2), the phase pole moving contact (302) is in contact with the second phase pole fixed contact (102), the neutral pole moving contact (401) is in contact with the second neutral pole fixed contact (202), and the second power supply is switched on,

during the transition of the main shaft (301) from the first position (S1) to the second position (S2), the movement process of the neutral pole moving contact (401) comprises a first phase and a second phase: in a first phase, the neutral pole moving contact (401) is kept static and is only contacted with the first neutral pole fixed contact (201); in the second phase, the neutral pole moving contact (401) is switched from being in contact with only the first neutral pole fixed contact (201) to being in contact with only the second neutral pole fixed contact (202), and the neutral pole moving contact (401) is always in contact with at least one of the first neutral pole fixed contact (201) and the second neutral pole fixed contact (202) in the switching process.

2. The dual power transfer switch of claim 1, wherein the movement of the neutral pole moving contact (401) during the transfer of the main shaft (301) from the second position (S2) to the first position (S1) comprises a third phase and a fourth phase: in a third phase, the neutral pole moving contact (401) is switched from being in contact with only the second neutral pole fixed contact (202) to being in contact with only the first neutral pole fixed contact (201), and the neutral pole moving contact (401) is always in contact with at least one of the first neutral pole fixed contact (201) and the second neutral pole fixed contact (202) in the switching process; in the fourth phase, the neutral pole moving contact (401) is kept static and is only contacted with the first neutral pole fixed contact (201).

3. The dual power transfer switch of claim 2, wherein the main shaft (301) further has a stable third position (OFF), between the first position (S1) and the second position (S2),

when the main shaft (301) is in a third position (OFF), the phase pole moving contact (302) is not in contact with the first phase pole fixed contact (101) and the second phase pole fixed contact (102), the neutral pole moving contact (401) is only in contact with the first neutral pole fixed contact (201), and the phase poles of the first power supply and the second power supply are disconnected,

the process of converting from the first position (S1) to the third position (OFF) corresponds to the first stage, the process of converting from the third position (OFF) to the second position (S2) corresponds to the second stage, the process of converting from the second position (S2) to the third position (OFF) corresponds to the third stage, and the process of converting from the third position (OFF) to the first position (S1) corresponds to the fourth stage.

4. The dual power transfer switch of claim 2 or 3,

a first contact part (3011) is arranged on the main shaft (301),

the neutral pole switching mechanism (400) further comprises:

a first end (4021) of the driving rod (402) is hinged to the main shaft (301), a second end (4022) of the driving rod (402) is movably connected to the first end (4011) of the neutral pole movable contact (401) and can drive the second end (4012) of the neutral pole movable contact (401) to switch between a first neutral pole static contact (201) and a second neutral pole static contact (202), a second contact portion (4023) is arranged on the driving rod (402) and located between the first end (4021) of the driving rod (402) and the second end (4022) of the driving rod (402), and the second contact portion (4023) is configured to be separated from or in contact with the first contact portion (3011); and

a first elastic component (410) connected to the movable neutral pole contact (401) for driving the movable neutral pole contact (401) to deflect to a position contacting with the first stationary neutral pole contact (201),

in the first stage, the first contact part (3011) and the second contact part (4023) are in a separated state; in the second stage, the first contact part (3011) presses the second contact part (4023) and drives the driving rod (402) to rotate, so that the neutral pole moving contact (401) is driven to rotate; in the third phase, the first elastic component (410) drives the neutral pole moving contact (401) to rotate; in the fourth stage, the first contact portion (3011) and the second contact portion (4023) are in a separated state.

5. The dual power transfer switch of claim 4, wherein the first end (4011) of the neutral movable contact (401) is hinged to the second end (4022) of the driving rod (402) by a first pin (403), and the first end (4011) of the neutral movable contact (401) is provided with a first sliding slot (4013), and the first pin (403) is slidable in the first sliding slot (4013).

6. The dual-power transfer switch of claim 4, wherein the first elastic component (410) comprises a first spring (411), a first spring holder (412) and a second pin (413), the first spring holder (412) is hinged to the neutral pole moving contact (401), a second sliding groove (4121) is formed in the first spring holder (412), the second pin (413) is fixedly arranged and located in the second sliding groove (4121), the first spring (411) is sleeved outside the first spring holder (412), a first end of the first spring (411) abuts against the second pin (413), and a second end of the first spring (411) abuts against a limiting surface (4122) of the first spring holder (412).

7. The dual power transfer switch of claim 6, wherein the moment of action of the first spring (411) on the movable neutral pole contact (401) when the main shaft (301) is in the first position (S1) is substantially equal to the moment of action of the first spring (411) on the movable neutral pole contact (401) when the main shaft (301) is in the second position (S2).

8. The dual power transfer switch of claim 1, wherein the neutral moving contact (401) comprises two metal sheets (4010) arranged side by side, the first and second neutral stationary contacts (201, 202) are located between the two metal sheets (4010), and the dual power transfer switch further comprises a second elastic member (420), and the two metal sheets (4010) maintain a contact pressure with the first and/or second neutral stationary contacts (201, 202) through the second elastic member (420).

9. The dual-power transfer switch of claim 8, wherein the second elastic member (420) comprises a second spring holder (421), a second spring (422) and a third pin (423), the third pin (423) passes through the two metal sheets (4010), and the second spring (422) is sleeved outside the third pin (423) and is located between the two metal sheets (4010) and a wall surface of the second spring holder (421).

10. The dual power transfer switch of claim 1 wherein the phase pole moving contact (302) comprises a first connection end (3021) and a second connection end (3022), the first connection end (3021) being configured to switch between the first phase pole stationary contact (101) or the second phase pole stationary contact (102), the second connection end (3022) being configured to connect to a load.

11. The dual power transfer switch of claim 1, wherein the first and second stationary neutral contacts (201, 202) are adjacent to and insulated from each other.

12. The dual power transfer switch of claim 1, wherein the neutral switching mechanism (400) further comprises a neutral outlet terminal (404) in contact with the neutral movable contact (401).

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