Dual power transfer switch

Abstract

The present invention provides a dual-power transfer switch. The dual-power transfer switch includes: a first-phase pole static contact and a first-neutral pole static contact, a second-phase pole static contact and a second-neutral pole static contact, a main shaft and a phase pole moving contact connected thereto, and a neutral pole moving contact. When the main shaft is in the first position, the phase pole moving contact contacts the first-phase pole static contact, and the neutral pole moving contact contacts the first-neutral pole static contact; when the main shaft is in the second position, the phase pole moving contact contacts the second-phase pole static contact, and the neutral pole moving contact contacts the second-neutral pole static contact. During the process of the main shaft converting from the first position to the second position, the movement process of the neutral pole moving contact includes a first stage and a second stage: in the first stage, the neutral pole moving contact remains stationary and only contacts the first-neutral pole static contact; in the second stage, the neutral pole moving contact realizes an overlapping conversion from the first-neutral pole static contact to the second-neutral pole static contact.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical switches, and in particular to a dual power supply transfer switch. Background Art

[0002] As demand for power continuity, safety, and reliability continues to deepen, the application of automatic transfer switches (ATS) is becoming increasingly widespread. Power-consuming locations such as data centers, hotels, and theaters generally require an emergency power source to ensure power continuity. A dual transfer switch can quickly switch between primary and backup power sources to ensure power continuity.

[0003] During power conversion, if the neutral line, like other phase lines, experiences a temporary disconnection, it can cause voltage fluctuations in electrical equipment, resulting in adverse effects and losses. For example, during dual-power conversion in a data center, a brief disconnection of the neutral line could increase the neutral-to-ground voltage and cause a server reboot, resulting in serious consequences such as data loss or server damage.

[0004] Prior art includes neutral line overlapping switching technology, which ensures that the neutral line is connected to at least one of the neutral lines of the primary or backup power source during power switching, thus preventing the neutral line from being left hanging. However, during this existing neutral line overlapping switching process, the neutral lines of the two power sources may be connected for a long time. This can cause the upstream leakage sensor to malfunction and introduce stray currents, compromising the safety of the power supply system. Summary of the Invention

[0005] Embodiments of the present invention provide a dual power transfer switch that prevents the neutral line from hanging and the neutral pole from overlapping for extended periods during power conversion, thereby improving the stability of the power supply system. Furthermore, the dual power transfer switch has high short-term withstand performance, a simple structure, and easy assembly.

[0006] An embodiment of the present invention provides a dual - power transfer switch, comprising: a first - phase - pole static contact and a first - neutral - pole static contact for connecting to the first power source; a second - phase - pole static contact and a second - neutral - pole static contact for connecting to the second power source; a phase - pole transfer mechanism including a main shaft and a phase - pole moving contact, the main shaft being rotatably arranged, the phase - pole moving contact being connected to the main shaft and capable of rotating under the drive of the main shaft to transfer between the first - phase - pole static contact and the second - phase - pole static contact; and a neutral - pole transfer mechanism including a neutral - pole moving contact, the neutral - pole transfer mechanism being connected to the main shaft and capable of moving under the drive of the main shaft to enable the neutral - pole moving contact to transfer between the first - neutral - pole static contact and the second - neutral - pole static contact. Wherein, the main shaft has a stable first position and a second position. When the main shaft is in the first position, the phase - pole moving contact contacts the first - phase - pole static contact, the neutral - pole moving contact contacts the first - neutral - pole static contact, and the first power source is connected; when the main shaft is in the second position, the phase - pole moving contact contacts the second - phase - pole static contact, the neutral - pole moving contact contacts the second - neutral - pole static contact, and the second power source is connected. During the process of the main shaft transferring from the first position to the second position, the movement process of the neutral - pole moving contact includes a first stage and a second stage: in the first stage, the neutral - pole moving contact remains stationary and only contacts the first - neutral - pole static contact; in the second stage, the neutral - pole moving contact transfers from only contacting the first - neutral - pole static contact to only contacting the second - neutral - pole static contact, and during the transfer process, the neutral - pole moving contact always contacts at least one of the first - neutral - pole static contact and the second - neutral - pole static contact.

[0007] In some examples, during the process of the main shaft transferring from the second position to the first position, the movement process of the neutral - pole moving contact includes a third stage and a fourth stage: in the third stage, the neutral - pole moving contact transfers from only contacting the second - neutral - pole static contact to only contacting the first - neutral - pole static contact, and during the transfer process, the neutral - pole moving contact always contacts at least one of the first - neutral - pole static contact and the second - neutral - pole static contact; in the fourth stage, the neutral - pole moving contact remains stationary and only contacts the first - neutral - pole static contact.

[0008] In some examples, the main shaft further has a stable third position, which is located between the first position and the second position. When the main shaft is in the third position, the phase pole moving contact does not contact with the first phase pole static contact and the second phase pole static contact, the neutral pole moving contact only contacts with the first neutral pole static contact, and the phase poles of the first power supply and the second power supply are both disconnected. The process of converting from the first position to the third position corresponds to the first stage, the process of converting from the third position to the second position corresponds to the second stage, the process of converting from the second position to the third position corresponds to the third stage, and the process of converting from the third position to the first position corresponds to the fourth stage.

[0009] In some examples, a first contact portion is provided on the main shaft, and the neutral pole conversion mechanism further includes: a driving rod, the first end of the driving rod is hinged to the main shaft, the second end of the driving rod is movably connected to the first end of the neutral pole moving contact and can drive the second end of the neutral pole moving contact to convert between the first neutral pole static contact and the second neutral pole static contact. A second contact portion is provided on the driving rod, which is located between the first end and the second end of the driving rod, and the second contact portion is configured to be separated from or in contact and cooperation with the first contact portion; and a first elastic member, which is connected to the neutral pole moving contact and is used to drive the neutral pole moving contact to deflect towards the position where it contacts with the first neutral pole static contact. In the first stage, the first contact portion and the second contact portion are in a separated state; in the second stage, the first contact portion presses the second contact portion and drives the driving rod to rotate, thereby driving the neutral pole moving contact to rotate; in the third stage, the first elastic member 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.

[0010] 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 shaft. A first sliding groove is provided at the first end of the neutral pole moving contact, and the first pin shaft can slide in the first sliding groove.

[0011] In some examples, the first elastic member includes a first spring, a first spring holder and a second pin shaft. The first spring holder is hinged to the neutral pole moving contact. A second sliding groove is provided on the first spring holder, and the second pin shaft is fixedly arranged and located in the second sliding groove. The first spring is sleeved outside the first spring holder. The first end of the first spring abuts against the second pin shaft, and the second end of the first spring abuts against the limiting surface of the first spring holder.

[0012] In some examples, when the main shaft is in the first position, the torque exerted by the first spring on the neutral pole moving contact is approximately equal to the torque exerted by the first spring on the neutral pole moving contact when the main shaft is in the second position.

[0013] In some examples, the neutral pole moving contact includes two metal sheets arranged side by side. The first neutral pole static contact and the second neutral pole static contact are located between the two metal sheets. The dual power supply transfer switch further includes a second elastic member, and the two metal sheets maintain a contact pressure with the first neutral pole static contact and / or the second neutral pole static contact through the second elastic member.

[0014] In some examples, the second elastic member includes a second spring holder, a second spring, and a third pin shaft. The third pin shaft passes through the two metal sheets, and the second spring is sleeved outside the third pin shaft and is located between the two metal sheets and the wall surface of the second spring holder.

[0015] 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 static contact and the second phase pole static contact, and the second end of the phase pole moving contact is configured to connect to a load.

[0016] In some examples, the first neutral pole static contact and the second neutral pole static contact are close to each other and insulated from each other.

[0017] In some examples, the neutral pole conversion mechanism further includes a neutral wire outlet end that contacts the neutral pole moving contact. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below.

[0019] Obviously, the drawings in the following description only relate to some embodiments of the present invention and do not limit the present invention.

[0020] Figure 1 3D structural schematic diagram of the dual power supply transfer switch provided by an embodiment of the present invention;

[0021] Figure 2A Another 3D structural schematic diagram of the dual power supply transfer switch provided by an embodiment of the present invention;

[0022] Figure 2B Partial structural schematic diagram of the dual power supply transfer switch provided by an embodiment of the present invention;

[0023] Figure 3 Planar structural schematic diagram of the dual power supply transfer switch provided by an embodiment of the present invention;

[0024] Figures 4 - 6 It is a structural schematic diagram of different states of a dual-power conversion switch during the conversion process;

[0025] Figure 7 It is a structural schematic diagram of the first elastic member when the main shaft is in the first position;

[0026] Figure 8 It is a structural schematic diagram of the first elastic member when the main shaft is in the second position;

[0027] Figure 9 It is a structural schematic diagram of a neutral pole conversion mechanism;

[0028] Figure 10 For Figure 9 The corresponding three-dimensional structural schematic diagram;

[0029] Figure 11 For along Figure 9 The view in the A-A direction in;

[0030] Figure 12 For along Figure 9 The view in the B-B direction in; and

[0031] Figure 13 It is a timing diagram of the conversion process of the dual-power conversion switch between the first position, the second position, and the third position. Specific embodiments

[0032] To make the objectives, 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. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0033] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the ordinary meanings understood by those of ordinary skill in the art to which the present invention pertains.

[0034] Embodiments of the present invention provide a dual-power conversion switch configured to switch between two power supplies. The dual-power conversion switch will be described in detail below with reference to the accompanying drawings.

[0035] Figure 1 It is a three-dimensional structural schematic diagram of the dual-power conversion switch provided by an embodiment of the present invention. As Figure 1As shown in the figure, the dual-power conversion switch includes: a first-phase static contact 101 and a first-neutral static contact 201 for connecting to a first power source; and a second-phase static contact 102 and a second-neutral static contact 202 for connecting to a second power source. For example, the first power source and the second power source can be a normal power source and a backup power source respectively.

[0036] For example, the first power source and the second power source can be three-phase alternating current, such as Figure 1 As shown in the figure, the number of the first-phase static contacts 101 and the second-phase static contacts 102 is three each, which respectively correspond to connecting the three phase lines of the first power source and the second power source. The first-neutral static contact 201 and the second-neutral static contact 202 respectively correspond to connecting the neutral lines of the first power source and the second power source.

[0037] For example, as Figure 1 As shown in the figure, the dual-power conversion switch further includes a phase-pole conversion mechanism 300. The phase-pole conversion mechanism 300 includes a main shaft 301 and phase-pole moving contacts 302. The main shaft 301 is rotatably arranged, and the phase-pole moving contacts 302 are connected to the main shaft 301 and can rotate under the drive of the main shaft 301 to switch between the first-phase static contact 101 and the second-phase static contact 102 or stay at an intermediate position between the first-phase static contact 101 and the second-phase static contact 102.

[0038] As Figure 1 As shown in the figure, the number of the phase-pole moving contacts 302 can also be three, which respectively correspond one-to-one to the first-phase static contact 101 and the second-phase static contact 102. The first end 3021 of each phase-pole moving contact 302 is used to switch between the corresponding first-phase static contact 101 and the second-phase static contact 102, and its second end 3022 is used to connect to a load.

[0039] The dual-power conversion switch can further include a housing (not shown in the figure) for carrying and accommodating each functional component. For example, the first-phase static contact, the second-phase static contact, the first-neutral static contact, and the second-neutral static contact can be fixedly arranged on the housing, and the main shaft can be rotatably arranged on the housing.

[0040] For example, as Figure 1 As shown in the figure, the dual-power conversion switch further includes a neutral-pole conversion mechanism 400. The neutral-pole conversion mechanism 400 includes a neutral-pole moving contact 401. The neutral-pole conversion mechanism 400 is connected to the main shaft 301 and can move under the drive of the main shaft 301 to switch the neutral-pole moving contact 401 between the first-neutral static contact 201 and the second-neutral static contact 202.

[0041] Figure 2A is another three-dimensional structural schematic diagram of the dual-power conversion switch, Figure 2B is a partial structural schematic diagram of the dual-power conversion switch,Figure 3 It is a schematic plan view of a dual-power conversion switch. As Figure 2A and Figure 3 shown, the neutral pole conversion mechanism 400 further includes a driving rod 402 and a first elastic member 410. The first end 4021 of the driving rod 402 is hinged to the main shaft 301, and the second end 4022 of the driving rod 402 is movably connected to the first end 4011 of the neutral pole moving contact 401 and can drive the second end 4012 of the neutral pole moving contact 401 (see Appendix Figure 3 ) to switch between the first neutral pole static contact 201 and the second neutral pole static contact 202.

[0042] For example, the hinge axis of the first end 4021 of the driving rod 402 and the main shaft 301 coincides with the central axis of the main shaft 301.

[0043] As Figure 2B shown, the first neutral pole static contact 201 and the second neutral pole static contact 202 are close to each other and insulated from each other. For example, there is a certain gap between the first neutral pole static contact 201 and the second neutral pole static contact 202, and this gap is smaller than the width of the neutral pole moving contact 401. When the neutral pole moving contact 401 slides across this gap, the first neutral pole static contact 201 and the second neutral pole static contact 202 can be simultaneously conducted with the neutral pole moving contact 401 to achieve neutral line overlap.

[0044] As Figure 2A and Figure 2B shown, the neutral pole conversion mechanism 400 further includes a neutral line outlet end 404, and the neutral line outlet end 404 is in contact with the neutral pole moving contact 401.

[0045] As Figure 2A and Figure 3 shown, a first contact portion 3011 is provided on the main shaft 301, and a second contact portion 4023 is provided on the driving rod 402. 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 and cooperation with the first contact portion 3011. The first contact portion 3011 and the second contact portion 4023 are separated or contacted as the main shaft 301 rotates. When the first contact portion 3011 contacts and presses the second contact portion 4023, a rotational torque can be applied to the neutral pole moving contact 402.

[0046] The first elastic member 410 is connected to the neutral pole moving contact 401 and is used to drive the neutral pole moving contact 401 to deflect towards the position in contact with the first neutral pole static contact 201. For example, as Figure 3As shown, the first elastic member 410 can be connected to the first end 4011 of the neutral pole moving contact 401. The first elastic member 410 includes a compression spring that provides a thrust force to the first end 4011 of the neutral pole moving contact 401, causing the first end 4011 of the neutral pole moving contact 401 to deflect to the right and the second end 4012 of the neutral pole moving contact 401 to deflect to the left. In the absence of external force, the second end 4012 remains in contact only with the first neutral pole static contact 201.

[0047] Figures 3 - 6 It is a schematic structural diagram of the conversion process of a dual-power transfer switch. As Figure 3 shown, the main shaft 301 has a stable first position S1, a second position S2, and a third position OFF. The main shaft 301 is the driving component of the dual-power transfer switch, and it can rotate in the direction shown by the arrow R (it can also rotate in the reverse direction) in the figure, driving the phase pole moving contact 302 and the neutral pole moving contact 401 to rotate, thereby switching the dual-power transfer switch between the first position S1, the second position S2, and the third position OFF. Figures 3 - 6 It shows different states of the dual-power transfer switch when the main shaft 301 rotates in the R direction. Figure 3 It shows the state of the dual-power transfer switch in the first position S1. Figure 4 It shows the state of the dual-power transfer switch in the third position OFF. Figure 5 It shows the state of the dual-power transfer switch between the third position OFF and the second position S2. Figure 6 It shows the state of the dual-power transfer switch in the second position S2.

[0048] As Figure 3 shown, 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 static contact 101, and the neutral pole moving contact 401 is in contact with the first neutral pole static contact 201. At this time, the first power supply is connected. As Figure 4 shown, when the main shaft 301 is in the third position OFF, the phase pole moving contact 302 is not in contact with either the first phase pole static contact 101 or the second phase pole static contact 102, and the neutral pole moving contact 401 is only in contact with the first neutral pole static contact 201. At this time, the phase poles of both the first power supply and the second power supply are disconnected. As Figure 6 shown, when the main shaft 301 is in the second position, the phase pole moving contact 302 is in contact with the second phase pole static contact 102, and the neutral pole moving contact 401 is in contact with the second neutral pole static contact 202. At this time, the second power supply is connected.

[0049] As Figures 3 - 6 shown, during the process of the main shaft 301 rotating from the first position S1 to the second position S2 in the R direction, the movement process of the neutral pole moving contact 401 includes a first stage and a second stage: In the first stage, as Figures 3 - 4As shown, the main shaft 301 rotates from the first position S1 to the third position OFF. The first contact portion 3011 changes from a separated state from the second contact portion 4023 to being in contact with the second contact portion 4023 (no force is exerted on the second contact portion 4023 yet). The neutral pole moving contact 401 remains stationary and only contacts the first neutral pole stationary contact 201. The switch changes from the state of being connected to the first power supply to the state of being disconnected from the phase poles of both the first power supply and the second power supply; in the second stage, as Figures 4 - 6 shown, the main shaft 301 rotates from the third position OFF to the second position S2. The first contact portion 3011 contacts and presses against the second contact portion 4023, thereby driving the drive rod 402 to rotate in the R direction. The drive rod 402 applies a rotational torque to the neutral pole moving contact 401, overcoming the thrust of the first elastic member, thereby driving the neutral pole moving contact 401 to rotate, such that the neutral pole moving contact 401 changes from only contacting the first neutral pole stationary contact 201 ( Figure 4 the state shown) to only contacting the second neutral pole stationary contact 202 ( Figure 6 the state shown). The switch changes from the state of being disconnected from the phase poles of both the first power supply and the second power supply to the state of being connected to the second power supply.

[0050] During the conversion process in the second stage, the neutral pole moving contact 401 is always in contact with at least one of the first neutral pole stationary contact 201 and the second neutral pole stationary contact 202. In this way, neutral line overlapping switching can be achieved, that is, ensuring that the neutral line is not suspended when switching the power supply, thereby reducing or avoiding voltage fluctuations of electrical equipment and improving safety.

[0051] For example, as Figure 5 shown, during the conversion process in the second stage, there may be a situation where the neutral pole moving contact 401 is simultaneously in contact with the first neutral pole stationary contact 201 and the second neutral pole stationary contact 202.

[0052] The main shaft 301 can also rotate in the reverse direction, that is, rotate in the -R direction, to achieve the conversion from the second position S2 to the first position S1. Its conversion process corresponds to the change from Figure 6 the state shown to Figure 3 the state shown. The movement process of the neutral pole moving contact includes the third stage and the fourth stage: In the third stage (from Figures 6 to 4), during the rotation of the main shaft, the main shaft 301 rotates from the second position S2 to the third position OFF. As the first contact portion 3011 releases the second contact portion 4023, the first elastic member 410 pushes the neutral pole moving contact 401 to rotate, so that the neutral pole moving contact 401 changes from only contacting the second neutral pole static contact 202 to only contacting the first neutral pole static contact 201. The switch changes from the state of being connected to the second power supply to the state of being disconnected from both the first power supply and the phase poles of the second power supply, and during the conversion process, the neutral pole moving contact 401 is always in contact with at least one of the first neutral pole static contact 201 and the second neutral pole static contact 202; in the fourth stage (from Figures 4 to 3 ), the neutral pole moving contact 401 remains stationary and only contacts the first neutral pole static contact 201.

[0053] As described above, 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.

[0054] In addition, Figures 3 - 6 The dashed arrows in show the flow direction of the neutral line current in the corresponding states. In Figure 3 and Figure 4 , the neutral pole moving contact 401 contacts the first neutral pole static contact 201, and the current of the neutral line flows through the first neutral pole static contact 201; in Figure 5 , the neutral pole moving contact 401 contacts both the first neutral pole static contact 201 and the second neutral pole static contact 202 at the same time, and the current of the neutral line flows through the first neutral pole static contact 201 and the second neutral pole static contact 202; in Figure 6 , the neutral pole moving contact 401 contacts the second neutral pole static contact 202, and the current of the neutral line flows through the second neutral pole static contact 202.

[0055] In the dual-power conversion switch provided in the embodiment of the present invention, the third position OFF may not be provided, that is, the main shaft 301 has a stable first position S1 and a second position S2, and the main shaft does not stay at the position shown in Figure 4 during the rotation between the first position S1 and the second position S2, and it can be realized without changing the structure of the dual-power conversion switch. Thus, during the process of the main shaft 301 converting from the first position to the second position, as in Figures 3 - 6As shown, the movement process of the neutral pole moving contact 401 also includes the above-mentioned first stage and second stage: in the first stage, the neutral pole moving contact 401 remains stationary and is only in contact with the first neutral pole static contact 201; in the second stage, the neutral pole moving contact 401 changes from only contacting the first neutral pole static contact 201 to only contacting the second neutral pole static contact 202, and during the conversion process, the neutral pole moving contact 401 is always in contact with at least one of the first neutral pole static contact 201 and the second neutral pole static contact 202.

[0056] Therefore, when the main shaft has stable first position S1, second position S2 and third position OFF, the dual power conversion 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 dual power conversion switch provided by the embodiment of the present invention can be used as a two-position switch.

[0057] In the first stage, the first contact part and the second contact part are in a separated state (it should be noted that when the first contact part and the second contact part just come into contact and no force is generated, it is also regarded as being in the separation stage); in the second stage, the first contact part presses the second contact part and drives the driving rod to rotate, thereby driving the neutral pole moving contact 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 part and the second contact part are in a separated state. Figure 4 As shown, in the first stage, the first contact part and the second contact part are in a separated state (it should be noted that when the first contact part and the second contact part just come into contact and no force is generated, it is also regarded as being in the separation stage); in the second stage, the first contact part presses the second contact part and drives the driving rod to rotate, thereby driving the neutral pole moving contact 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 part and the second contact part are in a separated state.

[0058] The structure and movement principle of the neutral pole conversion mechanism 400 will be further introduced below.

[0059] As shown in Figure 2, the first end 4011 of the neutral pole moving contact 401 is hinged to the second end 4022 of the driving rod 402 through the first pin shaft 403. The first end 4011 of the neutral pole moving contact 401 is provided with a first sliding groove 4013, and the first pin shaft 403 can slide in the first sliding groove 4013, that is, the neutral pole moving contact 401 and the driving rod 402 can achieve relative rotation and relative sliding at the connection, so as to prevent movement interference between the neutral pole moving contact and the driving rod.

[0060] Figure 7 and Figure 8 show the connection structure between the first elastic component and the neutral pole moving contact, Figure 7 show the state of the first elastic component at the first position S1, Figure 8 show the state of the first elastic component at the second position S2.

[0061] As Figure 7 and Figure 8As shown, the first elastic member 410 includes a first spring 411, a first spring holder 412, and a second pin shaft 413. The first spring holder 412 is hinged to the neutral pole moving contact 401 through a pin shaft. A second sliding groove 4121 is provided on the first spring holder 412. The second pin shaft 413 is fixedly arranged. For example, the second pin shaft 413 can be fixedly arranged on the housing. The second pin shaft 413 is located within the second sliding groove 4121, and the first spring holder 412 and the second pin shaft 413 can slide relative to each other along the extending direction of the second sliding groove 4121. The first spring 411 is sleeved outside the first spring holder 412. The first end 4111 of the first spring 411 abuts against the second pin shaft 413, and the second end 4112 of the first spring 411 abuts against the limiting surface 4122 of the first spring holder 412.

[0062] The first spring 411 can be a compression spring. In Figure 7 , the first spring 411 is in the minimum compression state, corresponding to Figure 3 the first position of the main shaft; in Figure 8 , the first spring 411 is in the maximum compression state, corresponding to Figure 6 the second position of the main shaft.

[0063] When the neutral pole moving contact 401 rotates, it drives the first spring holder 412 to move, and the second sliding groove 4121 of the first spring holder 412 can slide on the second pin shaft 413. When the first end 4121a of the second sliding groove 4121 abuts against the second pin shaft 413, the rotation of the neutral pole moving contact 401 in the clockwise direction (R direction) is restricted, corresponding to the minimum compression state; when the second end 4121b of the second sliding groove 4121 abuts against the second pin shaft 413, the position of the neutral pole moving contact 401 in the counterclockwise direction (-R direction) is restricted, corresponding to the maximum compression state.

[0064] When the drive rod 402 does not drive the neutral pole moving contact 401, the neutral pole moving contact 401 can be held in the Figure 3 shown position under the action of the first spring 411, so that the neutral pole moving contact 401 only remains in contact with the first neutral pole static contact 201.

[0065] As Figure 7 shown, in the minimum compression state, the thrust of the first spring 411 on the neutral pole moving contact 401 is F1, and the generated acting moment is F1×L1; as Figure 8 shown, in the maximum compression state, the thrust of the first spring 411 on the neutral pole moving contact 401 is F2, and the generated acting moment is F2×L2. Obviously, F1 < F2.

[0066] In some examples, through reasonable design calculations, L1 > L2 is achieved, and F1×L1 ≈ F2×L2, that is, the acting torques of the first spring on the neutral pole moving contact in the minimum compression state and the maximum compression state are approximately equal. In other words, the acting torque of the first spring on the neutral pole moving contact when the main shaft is in the first position is approximately equal to the acting torque of the first spring on the neutral pole moving contact when the main shaft is in the second position. With such a setting, when the main shaft is in any position, an appropriate torque can be ensured to drive the moving contact to reset, without redundant torque; at the same time, the neutral pole load can also be reduced, that is, the requirement for the rotational energy of the main shaft is reduced. By setting the first elastic component, it is possible to prevent the neutral pole moving contact from oscillating near when the main shaft rotates to the third position, thereby avoiding the neutral pole moving contact from contacting the first neutral pole static contact and the second neutral pole static contact simultaneously.

[0067] Figure 9 It is a structural schematic diagram of the neutral pole conversion mechanism, showing the structures of the neutral pole moving contact, the first neutral pole static contact, and the second neutral pole static contact; Figure 10 For Figure 9 The corresponding three-dimensional structural schematic diagram; Figure 11 For along Figure 9 The view in the A - A direction in Figure 12 For along ​ The view in the B - B direction in

[0068] As ​ shown, the neutral pole moving contact 401 includes two metal sheets 4010 arranged side by side. In the direction perpendicular to the thickness of the metal sheet, the first neutral pole static contact 201 and the second neutral pole static contact 202 are located between the two metal sheets 4010, and the neutral line outgoing terminal 404 is also located between the two metal sheets 4010.

[0069] As ​ and ​ shown, the double - power conversion switch further includes a second elastic component 420, and the two metal sheets 4010 maintain a contact pressure with the first neutral pole static contact 201 and / or the second neutral pole static contact 202 through the second elastic component 420.

[0070] The second elastic member 420 includes a second spring holder 421, a second spring 422, and a third pin shaft 423. The third pin shaft 423 passes through two metal sheets 4010 and fixes them on the second spring holder 421. The second spring 422 is sleeved outside the third pin shaft 423 and is located between the two metal sheets 4010 and the wall surface of the second spring holder 421. The second spring 422 can be a compression spring to press the two metal sheets against the first neutral pole static contact 201, the second neutral pole static contact 202, and the neutral line outlet end 404 therebetween. The neutral pole moving contact 401 can rotate around the third pin shaft 423 to achieve conduction with the first neutral pole static contact 201 and / or the second neutral pole static contact 202.

[0071] The dual-power conversion switch provided by the embodiment of the present invention can ensure that during the conversion between the first power supply and the second power supply, the neutral pole moving contact contacts at least one of the first neutral pole static contact and the second neutral pole static contact, thereby avoiding the suspension of the neutral line. Moreover, in the state where both the phase poles of the first power supply and the second power supply are disconnected, it can also prevent the neutral pole moving contact from simultaneously contacting the first neutral pole static contact and the second neutral pole static contact, thereby avoiding the generation of stray current and improving the safety of the power supply system.

[0072] ​ It is a timing diagram of the conversion process of the dual-power conversion switch among the first position, the second position, and the third position. In the figure, P1 represents the phase pole of the first power supply, P2 represents the phase pole of the second power supply, N1 represents the neutral pole of the first power supply, N2 represents the neutral pole of the second power supply, and the upward convex position of the rectangular wave of P1, P2, N1, and N2 indicates conduction, and the flat position indicates disconnection. As ​ shown, when converting from the third position OFF to the first position S1, the neutral pole of the first power supply is always conducting, that is, the neutral pole moving contact is always in contact with the first neutral pole static contact. The neutral pole of the first power supply changes from off to on, and the phase pole of the second power supply is always off; when converting from the first position S1 to the third position OFF, the neutral pole of the first power supply is always conducting, that is, the neutral pole moving contact is in contact with the first neutral pole static contact. The phase pole of the first power supply changes from on to off, and the phase pole of the second power supply is always off; when converting from the third position OFF to the second position S2, the neutral pole moving contact overlaps and contacts with the first neutral pole static contact and the second neutral pole static contact, and the overlapping time is t1; when converting from the second position S2 to the third position OFF, the neutral pole moving contact overlaps and contacts with the first neutral pole static contact and the second neutral pole static contact, and the overlapping time is t2.

[0073] Finally, it should be noted that when the present invention describes the positions of various components and their mating relationships, etc., usually one / a pair of components are taken as examples. However, those skilled in the art should understand that such positions, mating relationships, etc. are equally applicable to other components / other pairs of components.

[0074] The above description is only an exemplary embodiment of the present invention and is not intended to limit the scope of protection of the present invention. The scope of protection of the present invention is determined by the appended claims.

Claims

1. A dual power supply transfer switch configured to transfer between a first power supply and a second power supply, characterized in that, Comprising: A first-phase pole static contact (101) and a first neutral pole static contact (201) for connecting to the first power supply; A second-phase pole static contact (102) and a second neutral pole static contact (202) for connecting to the second power supply; A phase pole conversion mechanism (300), including a main shaft (301) and a phase pole moving contact (302), the main shaft (301) is rotatably arranged, and the phase pole moving contact (302) is connected to the main shaft (301) and can rotate under the drive of the main shaft (301) to switch between the first-phase pole static contact (101) and the second-phase pole static contact (102); And A neutral pole conversion mechanism (400), including a neutral pole moving contact (401) and a driving rod (402), 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 pole moving contact (401) and can drive a second end (4012) of the neutral pole moving contact (401) to switch between the first neutral pole static contact (201) and the second neutral pole static 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) contacts the first-phase pole static contact (101), the neutral pole moving contact (401) contacts the first neutral pole static contact (201), and the first power supply is switched on; when the main shaft (301) is in the second position (S2), the phase pole moving contact (302) contacts the second-phase pole static contact (102), the neutral pole moving contact (401) contacts the second neutral pole static contact (202), and the second power supply is switched on, During the process of the main shaft (301) switching from the first position (S1) to the second position (S2), the movement process of the neutral pole moving contact (401) includes a first stage and a second stage: in the first stage, the neutral pole moving contact (401) remains stationary and only contacts the first neutral pole static contact (201); in the second stage, the neutral pole moving contact (401) switches from only contacting the first neutral pole static contact (201) to only contacting the second neutral pole static contact (202), and during the switching process, the neutral pole moving contact (401) always contacts at least one of the first neutral pole static contact (201) and the second neutral pole static contact (202).

2. The double power supply conversion switch according to claim 1, characterized in that, During the conversion of the main shaft (301) from the second position (S2) to the first position (S1), the movement process of the neutral pole moving contact (401) includes a third stage and a fourth stage: in the third stage, the neutral pole moving contact (401) is converted from only contacting the second neutral pole static contact (202) to only contacting the first neutral pole static contact (201), and during the conversion process, the neutral pole moving contact (401) is always in contact with at least one of the first neutral pole static contact (201) and the second neutral pole static contact (202); in the fourth stage, the neutral pole moving contact (401) remains stationary and only contacts the first neutral pole static contact (201).

3. The double power supply transfer switch according to claim 2, wherein The main shaft (301) also has a stable third position (OFF), located between the first position (S1) and the second position (S2). When the main shaft (301) is in the third position (OFF), the phase pole moving contact (302) does not contact either the first phase pole static contact (101) or the second phase pole static contact (102), the neutral pole moving contact (401) only contacts the first neutral pole static contact (201), and the phase poles of the first power supply and the second power supply are both 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 double power supply transfer switch according to claim 2 or 3, characterized in that a first contact portion (3011) is provided on the main shaft (301). a second contact portion (4023) is provided on the drive rod (402), located between the first end (4021) and the second end (4022) of the drive rod (402), and the second contact portion (4023) is configured to be separated from or in contact and cooperation with the first contact portion (3011). and a first elastic member (410), connected to the neutral pole moving contact (401), for driving the neutral pole moving contact (401) to deflect to a position in contact with the first neutral pole static contact (201). In the first stage, the first contact portion (3011) and the second contact portion (4023) are in a separated state; in the second stage, the first contact portion (3011) presses the second contact portion (4023) and drives the drive rod (402) to rotate, thereby driving the neutral pole moving contact (401) to rotate; in the third stage, the first elastic member (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 source transfer switch according to claim 4, characterized in that, The first end (4011) of the neutral pole moving contact (401) is hinged to the second end (4022) of the driving rod (402) by a first pin shaft (403). A first sliding groove (4013) is provided at the first end (4011) of the neutral pole moving contact (401), and the first pin shaft (403) can slide within the first sliding groove (4013).

6. The double power supply conversion switch according to claim 4, characterized in that, The first elastic member (410) includes a first spring (411), a first spring holder (412) and a second pin shaft (413). The first spring holder (412) is hinged to the neutral pole moving contact (401). A second sliding groove (4121) is provided on the first spring holder (412). The second pin shaft (413) is fixedly arranged and located within the second sliding groove (4121). The first spring (411) is sleeved outside the first spring holder (412). The first end of the first spring (411) abuts against the second pin shaft (413), and the second end of the first spring (411) abuts against the limiting surface (4122) of the first spring holder (412).

7. The dual-power conversion switch according to claim 6, characterized in that, When the main shaft (301) is in the first position (S1), the torque exerted by the first spring (411) on the neutral pole moving contact (401) is substantially equal to the torque exerted by the first spring (411) on the neutral pole moving contact (401) when the main shaft (301) is in the second position (S2).

8. The dual-power conversion switch according to claim 1, characterized in that, The neutral pole moving contact (401) includes two metal sheets (4010) arranged side by side. The first neutral pole static contact (201) and the second neutral pole static contact (202) are located between the two metal sheets (4010). The dual power conversion switch further includes a second elastic member (420). The two metal sheets (4010) maintain contact pressure with the first neutral pole static contact (201) and / or the second neutral pole static contact (202) through the second elastic member (420).

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

10. The double power supply transfer switch according to claim 1, characterized in that, The phase pole moving contact (302) includes a first end (3021) and a second end (3022). The first end (3021) of the phase pole moving contact (302) is configured to switch between the first phase pole static contact (101) and the second phase pole static contact (102). The second end (3022) of the phase pole moving contact (302) is configured to connect to a load.

11. The double power supply transfer switch according to claim 1, characterized in that, The first neutral pole static contact (201) and the second neutral pole static contact (202) are close to each other and insulated from each other.

12. The double power supply conversion switch according to claim 1, characterized in that, The neutral pole conversion mechanism (400) further includes a neutral wire outlet end (404) that contacts the neutral pole moving contact (401).

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