Neutral line change-over contact assembly and dual-power change-over switch

Abstract

The embodiment of the utility model provides a neutral line change-over contact assembly and a dual-power change-over switch. A first static contact and a second static contact of the neutral line conversion contact assembly are spaced apart. The first connecting piece is arranged on one side, facing the second static contact, of the first static contact. The second connecting piece is arranged on the side, facing the first static contact, of the second static contact. The second connecting pieces and the first connecting pieces are arranged at intervals. The moving contact is switched between the first static contact and the second static contact along a predetermined path. The preset path comprises a first stroke section, a second stroke section and a third stroke section which are arranged in sequence. When the moving contact is in the first stroke section, the moving contact is connected with the first connecting piece. And when the moving contact is in the second stroke section, the moving contact is connected with the first connecting piece and the second connecting piece. And under the condition that the moving contact is in the third stroke section, the moving contact is connected with the second connecting piece. By means of the arrangement, the moving contact is connected with at least one connecting piece when moving, and a current return path is smooth.

Description

Technical Field

[0001] The embodiments disclosed herein relate generally to the field of electrical equipment, and more particularly to a neutral line changeover contact assembly and a dual power supply changeover switch. Background Technology

[0002] Dual power transfer switches are widely used in daily life and production. They can automatically switch to a backup power source when the main power source fails, thus ensuring the continuity of power supply. In some conventional dual power transfer switches, during the power switching process, there is a brief disconnection between the neutral line and the two power sources, which may cause the load-side voltage to rise. When the neutral line is disconnected, the current return path is obstructed, which may cause a floating ground effect or a half-wave rectification effect, resulting in an abnormal rise in the load-side voltage, which may damage the connected equipment. Utility Model Content

[0003] The purpose of the embodiments disclosed herein is to provide a neutral line changing contact assembly and a dual power supply changeover switch to at least partially solve the above-mentioned problems and other potential problems.

[0004] In a first aspect of this disclosure, a neutral line changeover contact assembly is provided. The neutral line changeover contact assembly includes: a first stationary contact and a second stationary contact spaced apart; a first connector disposed on the side of the first stationary contact facing the second stationary contact and coupled to the first stationary contact, and extending toward the second stationary contact; a second connector disposed on the side of the second stationary contact facing the first stationary contact and coupled to the second stationary contact, and extending toward the first stationary contact, the second connector being spaced apart from the first connector; and a moving contact disposed between the first and second stationary contacts and adapted to switch between the first and second stationary contacts along a predetermined path, the predetermined path including a first travel segment, a second travel segment, and a third travel segment arranged sequentially, wherein when the moving contact is in the first travel segment, the moving contact is connected to the first connector; when the moving contact is in the second travel segment, the moving contact is connected to both the first and second connectors; and when the moving contact is in the third travel segment, the moving contact is connected to the second connector.

[0005] In some embodiments, the neutral line changeover contact assembly further includes a load-side electrode terminal rotatably coupled to a moving contact such that the moving contact rotates about the load-side electrode terminal.

[0006] In some embodiments, the moving contact includes a first clamp and a second clamp, the first clamp being coupled to the second clamp; a first connector is disposed on the movement path of the first clamp to connect with the first clamp; and a second connector is disposed on the movement path of the second clamp to connect with the second clamp.

[0007] In some embodiments, the first stationary contact includes a pair of first protrusions, the pair of first protrusions corresponding to a first clamp and a second clamp respectively, and the pair of first protrusions being adapted to connect with the first clamp and the second clamp that have moved to the first stationary contact; the second stationary contact includes a pair of second protrusions, the pair of second protrusions corresponding to the first clamp and the second clamp respectively, and the pair of second protrusions being adapted to connect with the first clamp and the second clamp that have moved to the second stationary contact.

[0008] In some embodiments, a first connector is coupled to a first protrusion in a pair of first protrusions that corresponds to a first clamp, and a second connector is coupled to a second protrusion in a pair of second protrusions that corresponds to a second clamp.

[0009] In some embodiments, each of the first and second clamps includes a pair of clamping tabs spaced apart and coupled together to define a clamping area between the pair of clamping tabs for clamping a respective connector.

[0010] In some embodiments, each clamp further includes: a limiting member coupled to the pair of clamp pieces; and a pair of elastic members disposed on both sides of the pair of clamp pieces and coupled to the pair of clamp pieces and the limiting member, the pair of elastic members being adapted to apply a force to the pair of clamp pieces to bring the pair of clamp pieces closer to each other.

[0011] In some embodiments, the end of the first connector away from the first stationary contact is provided with a first guide slope to guide the first connector to connect with the first clamp; the end of the second connector away from the second stationary contact is provided with a second guide slope to guide the second connector to connect with the second clamp.

[0012] In some embodiments, the neutral line changeover contact assembly further includes a support member disposed between the first stationary contact and the second stationary contact, and coupled to the first connector and the second connector.

[0013] In a second aspect of this disclosure, a dual power transfer switch is provided. This dual power transfer switch includes a neutral line changing contact assembly as described in the first aspect of this disclosure.

[0014] In embodiments of this disclosure, the neutral line changing contact assembly includes a first stationary contact, a second stationary contact, a first connector, a second connector, and a moving contact. The first and second stationary contacts are spaced apart. The first connector is disposed on the side of the first stationary contact facing the second stationary contact and coupled to the first stationary contact. The first connector extends toward the second stationary contact. The second connector is disposed on the side of the second stationary contact facing the first stationary contact and coupled to the second stationary contact. The second connector extends toward the first stationary contact and is spaced apart from the first connector. The moving contact is disposed between the first and second stationary contacts and is adapted to switch between the first and second stationary contacts along a predetermined path. The predetermined path includes a first travel segment, a second travel segment, and a third travel segment arranged sequentially. When the moving contact is in the first travel segment, the moving contact is connected to the first connector. When the moving contact is in the second travel segment, the moving contact is connected to both the first and second connectors. When the moving contact is in the third travel segment, the moving contact is connected to the second connector. With this arrangement, during the switching process between the first stationary contact and the second stationary contact, the moving contact is connected to at least one of the first and second connecting members, ensuring that the current return path is always unobstructed. This prevents abnormal voltage rise at the load end and improves the safety of the connected equipment.

[0015] It should be understood that the content described in this section is not intended to limit the key or essential features of the embodiments of this disclosure, nor is it intended to restrict the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0016] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. In the drawings, the same or similar reference numerals denote the same or similar elements, wherein:

[0017] Figure 1 A perspective view of a neutral line switching contact assembly according to an embodiment of the present disclosure is shown;

[0018] Figure 2 A rear view of a neutral line switching contact assembly according to an embodiment of the present disclosure is shown;

[0019] Figure 3 A top view of the changeover contact assembly for other phase lines is shown;

[0020] Figure 4 A top view of a neutral line switching contact assembly according to an embodiment of the present disclosure is shown;

[0021] Figure 5 A perspective view of a neutral line changeover contact assembly according to an embodiment of the present disclosure is shown, wherein the moving contact is located in the first stroke segment and connected to the first connector;

[0022] Figure 6 A perspective view of a neutral line changeover contact assembly according to an embodiment of the present disclosure is shown, wherein the moving contact is located in the second stroke segment and is connected to the first connector and the second connector;

[0023] Figure 7 A perspective view of a neutral line changeover contact assembly according to an embodiment of the present disclosure is shown, wherein the moving contact is located in the third stroke segment and connected to the second connector;

[0024] Figure 8 A perspective view of a neutral line changing contact assembly according to an embodiment of the present disclosure is shown, wherein the moving contact is connected to a pair of first protrusions; and

[0025] Figure 9 A side view of the moving contact and load-side electrode terminal according to an embodiment of the present disclosure is shown, wherein the clamp includes an elastic member, a limiting member, and a clamping piece.

[0026] Explanation of reference numerals in the attached figures:

[0027] 11. First stationary contact; 111. First protrusion; 12. Second stationary contact; 121. Second protrusion;

[0028] 21. First connector; 211. First guide ramp; 22. Second connector; 221. Second guide ramp;

[0029] L, Pre-determined route; L1, First travel segment; L2, Second travel segment; L3, Third travel segment;

[0030] 30. Moving contact; 301. First chuck; 302. Second chuck; 31. Clamping piece; 310. Clamping area; 32. Limiting element; 33. Elastic element;

[0031] 40. Load-side electrode terminals;

[0032] 50. Support components. Detailed Implementation

[0033] Preferred embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.

[0034] The term "comprising" and its variations as used herein signify open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "at least partially based on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first", "second", etc., may refer to different or the same objects.

[0035] As mentioned above, in some conventional dual-power transfer switches, during the power switching process, the neutral line experiences a brief disconnection between the two power sources, which may cause the load-side voltage to rise. When the neutral line is disconnected, the current return path is obstructed, which may cause a floating ground effect or a half-wave rectification effect, leading to an abnormal rise in the load-side voltage and potentially damaging the connected equipment.

[0036] This disclosure provides a neutral line changeover contact assembly and a dual-power transfer switch. In this neutral line changeover contact assembly, a first stationary contact and a second stationary contact are spaced apart. A first connector is disposed on the side of the first stationary contact facing the second stationary contact and coupled to the first stationary contact. The first connector extends toward the second stationary contact. A second connector is disposed on the side of the second stationary contact facing the first stationary contact and coupled to the second stationary contact. The second connector extends toward the first stationary contact and is spaced apart from the first connector. A moving contact is disposed between the first and second stationary contacts and is adapted to switch between the first and second stationary contacts along a predetermined path. The predetermined path includes a first travel segment, a second travel segment, and a third travel segment arranged sequentially. When the moving contact is in the first travel segment, the moving contact is connected to the first connector. When the moving contact is in the second travel segment, the moving contact is connected to both the first and second connectors. When the moving contact is in the third travel segment, the moving contact is connected to the second connector. With this arrangement, during the switching process between the first and second stationary contacts, the moving contact is connected to at least one of the first and second connecting members. The current return path remains unobstructed, preventing abnormal voltage rises at the load end and thus improving the safety of the connected equipment. The following will combine... Figures 1 to 9 The principles of this disclosure will be described in detail below.

[0037] like Figure 1 and Figure 2 As shown, the neutral line changeover contact assembly includes a first stationary contact 11, a second stationary contact 12, a first connector 21, a second connector 22, and a moving contact 30.

[0038] The first stationary contact 11 can be electrically connected to a first power source, and the second stationary contact 12 can be electrically connected to a second power source. One of the first and second power sources is the primary power source, and the other is the backup power source. The first stationary contact 11 and the second stationary contact 12 are fixed contact points, spaced apart. This arrangement prevents direct contact between the first stationary contact 11 and the second stationary contact 12, thus preventing short circuits. Furthermore, the distance between the first stationary contact 11 and the second stationary contact 12 can be arranged according to electrical safety standards, maintaining insulation performance under high voltage or high current conditions, thereby protecting the stable operation of the circuit system.

[0039] Figure 3 A top view of the changeover contact assembly for the other phase lines is shown. Figure 4 A top view of the neutral line changeover contact assembly of this disclosure is shown, in which a first connector 21 and a second connector 22 are shown.

[0040] like Figure 2 and Figure 4 As shown, a first connector 21 is disposed on the side of the first stationary contact 11 facing the second stationary contact 12 and coupled to the first stationary contact 11. The first connector 21 and the first stationary contact 11 form an electrically continuous conductive path. The first connector 21 extends toward the second stationary contact 12, providing a time-delayed disconnection electrical connection for the moving contact 30. A second connector 22 is disposed on the side of the second stationary contact 12 facing the first stationary contact 11 and coupled to the second stationary contact 12. The second connector 22 extends toward the first stationary contact 11 and is spaced apart from the first connector 21. The second connector 22 also provides a time-delayed disconnection electrical connection for the moving contact 30.

[0041] In some embodiments, to reduce resistance loss, the first connector 21 and the second connector 22 can be made of metal materials with good electrical conductivity, such as copper, aluminum, or silver alloys. Furthermore, to withstand frequent mechanical friction, the first connector 21 and the second connector 22 can undergo surface treatment or employ special manufacturing processes to enhance their wear resistance and corrosion resistance.

[0042] like Figure 1 and Figure 2As shown, the moving contact 30 is disposed between the first stationary contact 11 and the second stationary contact 12. The moving contact 30 is adapted to switch between the first stationary contact 11 and the second stationary contact 12 along a predetermined path L. The predetermined path L includes a first travel segment L1, a second travel segment L2, and a third travel segment L3 arranged sequentially. The moving contact 30 is used to perform the actual current path switching task, and it can move smoothly between the first stationary contact 11 and the second stationary contact 12. In some embodiments, the moving contact 30 may employ a spring or other form of elastic element to provide elastic pressure, thereby ensuring good contact between the moving contact 30 and the first stationary contact 11, the second stationary contact 12, the first connector 21, and the second connector 22 at different stages. Furthermore, the moving contact 30 also has good conductivity and durability.

[0043] like Figure 5 As shown, when the moving contact 30 is in the first stroke segment L1, the moving contact 30 is connected to the first connecting member 21.

[0044] like Figure 6 As shown, when the moving contact 30 is in the second stroke segment L2, the moving contact 30 is connected to the first connector 21 and the second connector 22.

[0045] like Figure 7 As shown, when the moving contact 30 is in the third stroke segment L3, the moving contact 30 is connected to the second connecting member 22.

[0046] With this arrangement, the moving contact 30 remains connected to at least one of the first connecting member 21 or the second connecting member 22 during the switching process between the first stationary contact 11 and the second stationary contact 12. Regardless of the travel segment of the moving contact 30, the current return path is unobstructed. By ensuring the continuity of the current path, the neutral line changeover contact assembly of the embodiments of this disclosure can prevent abnormal voltage rises at the load end, thereby improving the safety of the connected equipment.

[0047] In some embodiments, such as Figure 1 and Figure 4 As shown, the neutral line changeover contact assembly also includes a load-side electrode terminal 40. The moving contact 30 is rotatably coupled to the load-side electrode terminal 40, thereby allowing the moving contact 30 to rotate about the load-side electrode terminal 40.

[0048] like Figure 1 and Figure 4As shown, when the moving contact 30 rotates counterclockwise around the load-side electrode terminal 40, the moving contact 30 can be electrically connected to the first stationary contact 11. When the moving contact 30 rotates clockwise around the load-side electrode terminal 40, the moving contact 30 is electrically connected to the second stationary contact 12. In this way, the moving contact 30 can smoothly switch between the first stationary contact 11 and the second stationary contact 12 through its rotation, ensuring the smoothness of the current path conversion. In addition, the moving contact 30 is always in direct contact with the load-side electrode terminal 40, which can reduce the occurrence of arcing during switching and improve the reliability of the circuit. As an example, a metal spring can also be provided between the moving contact 30 and the load-side electrode terminal 40 to ensure the stability of the electrical connection between them.

[0049] In some embodiments, such as Figure 1 As shown, the moving contact 30 includes a first clamp 301 and a second clamp 302. The first clamp 301 is coupled to the second clamp 302. As an example, the first clamp 301 and the second clamp 302 can be fixed together using threaded parts and other connecting parts. The first clamp 301 and the second clamp 302 will not separate during current switching. As another example, the moving contact 30 may also include a housing. The first clamp 301 and the second clamp 302 are disposed within the housing. The housing not only protects the internal moving contact 30 but also fixes the first clamp 301 and the second clamp 302, allowing the two clamps to move synchronously as a whole.

[0050] like Figure 1 and Figure 2 As shown, the first connector 21 is disposed on the movement path of the first clamp 301. When the moving contact 30 moves, the first clamp 301 can connect with the first connector 21. Similarly, the second connector 22 is located on the movement path of the second clamp 302, and when the moving contact 30 moves, the second clamp 302 can connect with the first connector 21. In this way, at least one current loop can be maintained regardless of the position of the moving contact 30.

[0051] In some embodiments, such as Figure 1 and Figure 2As shown, the first stationary contact 11 includes a pair of first protrusions 111. The pair of first protrusions 111 correspond to the first clamp 301 and the second clamp 302, respectively. The pair of first protrusions 111 are respectively adapted to connect with the first clamp 301 and the second clamp 302 when they move to the position of the first stationary contact 11. In this way, when the moving contact 30 moves to the position of the first stationary contact 11, the first clamp 301 and the second clamp 302 respectively clamp the pair of first protrusions 111. Even in the presence of mechanical vibration or current surges, the two clamps can firmly maintain contact with the pair of first protrusions 111, thereby improving the stability of the circuit connection between the moving contact 30 and the first stationary contact 11. In scenarios requiring frequent switching of current paths, the pair of first protrusions 111, the first clamp 301, and the second clamp 302 improve the reliability of the circuit connection.

[0052] In some embodiments, such as Figure 1 and Figure 2 As shown, the second stationary contact 12 includes a pair of second protrusions 121. The pair of second protrusions 121 correspond to the first clamp 301 and the second clamp 302, respectively. The pair of second protrusions 121 are respectively adapted to connect with the first clamp 301 and the second clamp 302 when they move to the position of the second stationary contact 12. In this way, when the moving contact 30 moves to the position of the second stationary contact 12, the first clamp 301 and the second clamp 302 respectively clamp the pair of second protrusions 121, thereby improving the stability of the circuit connection between the moving contact 30 and the second stationary contact 12.

[0053] In some embodiments, such as Figure 1 and Figure 2 As shown, the first connector 21 is coupled to the first protrusion 111 corresponding to the first clamp 301 in a pair of first protrusions 111. The second connector 22 is coupled to the second protrusion 121 corresponding to the second clamp 302 in a pair of second protrusions 121. In this way, as the moving contact 30 approaches the first stationary contact 11, the first clamp 301 can smoothly slide from the first connector 21 onto the corresponding first protrusion 111. Similarly, as the moving contact 30 approaches the second stationary contact 12, the second clamp 302 can smoothly slide from the second connector 22 onto the corresponding second protrusion 121. The entire movement process can remain continuous, avoiding the generation of arcs due to poor contact or momentary disconnection.

[0054] In some embodiments, such as Figure 9As shown, each of the first clamp 301 and the second clamp 302 includes a pair of clamping tabs 31. The pair of clamping tabs 31 are spaced apart and coupled together, defining a clamping area 310 between the pair of clamping tabs 31 for clamping the corresponding connector. In this way, the pair of clamping tabs 31 can form a stable contact with the corresponding connector during rotation of the moving contact 30. As an example, the pair of clamping tabs 31 can be made of metal springs, for example, using materials with high conductivity and good elasticity. Metal springs can maintain stable mechanical properties during long-term use and can also provide a reliable electrical connection.

[0055] As the moving contact 30 moves along the predetermined path L, the paired metal springs automatically adjust the distance between them according to the shape of the connector and firmly clamp the corresponding connector through elastic restoring force. Even when subjected to mechanical vibration, temperature changes, or other environmental factors, the paired clamps 31 can still maintain the clamping of the connector, preventing loosening or poor contact. Furthermore, the spacing between the paired clamps 31 is adapted to the size of the connector, ensuring sufficient clamping force without damaging the connector surface or affecting the movement of the moving contact 30 due to excessive tightness.

[0056] In some embodiments, such as Figure 9 As shown, each clamp also includes a limiting member 32 and a pair of elastic members 33. The limiting member 32 is coupled to the pair of clamping pieces 31 and can limit the distance between the pair of clamping pieces 31, thereby allowing the pair of clamping pieces 31 to tightly clamp the corresponding connecting piece.

[0057] As an example, the limiting member 32 can be an annular metal frame in which the paired clips 31 are fixed by an annular structure. The annular metal frame, through its rigid framework, can prevent the paired clips 31 from over-spreading when subjected to external forces, thereby maintaining a stable contact pressure between them and the corresponding connectors.

[0058] It should be understood that in other embodiments, the limiting member 32 may also be a threaded member, a snap-fit ​​member or other limiting structure. This disclosure does not limit this, and the most suitable limiting mechanism can be flexibly selected according to the specific application scenario.

[0059] like Figure 9As shown, a pair of elastic elements 33 are disposed on both sides of a pair of clamping pieces 31 and coupled to the clamping pieces 31 and the limiting element 32. The pair of elastic elements 33 can apply a spring force to the pair of clamping pieces 31 to bring them closer together. Under the influence of external factors such as mechanical vibration or temperature changes, the pair of clamping pieces 31 can still firmly clamp the corresponding connecting pieces. The pair of elastic elements 33 can be made of elastic and durable materials, such as spring steel or shape memory alloy, to provide long-term stable elastic support. When the moving contact 30 moves and contacts the connecting piece, the pair of clamping pieces 31, under the action of the pair of elastic elements 33, tightly clamp the corresponding connecting piece, thereby ensuring the reliability and continuity of electrical contact.

[0060] In some embodiments, such as Figure 1 and Figure 2 As shown, a first guide slope 211 is provided at the end of the first connector 21 away from the first stationary contact 11. The first guide slope 211 can form a pointed structure at the end of the first connector 21. When the moving contact 30 moves from the second stationary contact 12 to the first stationary contact 11, the first guide slope 211 can guide the first clamp 301 to connect with the first connector 21. In this way, precise and reliable electrical contact can be achieved even in the case of high-speed switching or slight alignment errors.

[0061] Similarly, a second guide ramp 221 is provided at the end of the second connector 22 away from the second stationary contact 12. When the moving contact 30 moves in the opposite direction, that is, from the first stationary contact 11 to the second stationary contact 12, the tip structure of the second guide ramp 221 can also guide the second clamp 302 to connect with the second connector 22. Through these two guide ramps, the moving contact 30 can maintain smooth and stable movement during switching.

[0062] In some embodiments, such as Figure 8 As shown, the neutral line changeover contact assembly also includes a support member 50. The support member 50 is disposed between the first stationary contact 11 and the second stationary contact 12, and coupled to the first connector 21 and the second connector 22. By providing additional mechanical support, deformation of the first connector 21 and the second connector 22 can be prevented from occurring under prolonged impact or vibration. The support member 50 enhances the structural stability of the two cantilevered components, allowing them to maintain precise position and shape. In this way, the support member 50 not only ensures smooth current path switching but also extends the service life of the assembly, thereby ensuring the safe and efficient operation of the power system.

[0063] In a second aspect of this disclosure, a dual power supply transfer switch is provided. This dual power supply transfer switch includes any of the above-described neutral line transfer contact assemblies.

[0064] In the neutral line changeover contact assembly, a first stationary contact 11 and a second stationary contact 12 are spaced apart. A first connector 21 is disposed on the side of the first stationary contact 11 facing the second stationary contact 12 and is coupled to the first stationary contact 11. The first connector 21 extends toward the second stationary contact 12. A second connector 22 is disposed on the side of the second stationary contact 12 facing the first stationary contact 11 and is coupled to the second stationary contact 12. The second connector 22 extends toward the first stationary contact 11, and is spaced apart from the first connector 21. A moving contact 30 is disposed between the first stationary contact 11 and the second stationary contact 12 and is adapted to switch between the first stationary contact 11 and the second stationary contact 12 along a predetermined path L. The predetermined path L includes a first travel segment L1, a second travel segment L2, and a third travel segment L3 arranged sequentially. When the moving contact 30 is in the first travel segment L1, the moving contact 30 is connected to the first connector 21. When the moving contact 30 is in the second stroke segment L2, it is connected to both the first connecting member 21 and the second connecting member 22. When the moving contact 30 is in the third stroke segment L3, it is connected to the second connecting member 22. With this arrangement, during the switching process between the first stationary contact 11 and the second stationary contact 12, the moving contact 30 is connected to at least one of the connecting members 21 and 22, ensuring a consistently unobstructed current return path. This prevents abnormal voltage rises at the load end and improves the safety of the connected equipment.

[0065] In some embodiments, such as Figure 3 As shown, the dual power transfer switch may also include one or more phase line changing contact assemblies, which are arranged adjacent to the neutral line changing contact assembly. The moving contacts of the phase line changing contact assembly and the neutral line changing contact assembly move synchronously.

[0066] When the moving contact of the phase changeover contact assembly separates from the corresponding stationary contact, the phase circuit is broken. In the neutral changeover contact assembly, the moving contact 30 is connected to at least one connector, ensuring a clear return path for the current and preventing abnormal voltage rises at the load end.

[0067] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, and are not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A neutral conversion contact assembly, characterized by, Comprising: a first stationary contact (11) and a second stationary contact (12) spaced apart; a first connecting member (21) disposed on a side of the first stationary contact (11) facing the second stationary contact (12), coupled to the first stationary contact (11), and extending toward the second stationary contact (12); a second connecting member (22) disposed on a side of the second stationary contact (12) facing the first stationary contact (11), coupled to the second stationary contact (12), and extending toward the first stationary contact (11), the second connecting member (22) being spaced apart from the first connecting member (21); and a movable contact (30) disposed between the first stationary contact (11) and the second stationary contact (12), and adapted to switch between the first stationary contact (11) and the second stationary contact (12) along a predetermined path (L) comprising a first stroke segment (L1), a second stroke segment (L2), and a third stroke segment (L3) disposed in sequence, in a case where the movable contact (30) is in the first stroke segment (L1), the movable contact (30) is connected to the first connecting member (21), in a case where the movable contact (30) is in the second stroke segment (L2), the movable contact (30) is connected to the first connecting member (21) and the second connecting member (22), and in a case where the movable contact (30) is in the third stroke segment (L3), the movable contact (30) is connected to the second connecting member (22).

2. The neutral transition contact assembly of claim 1, wherein, Further comprising: a load side electrode terminal (40) rotatably coupled to the movable contact (30) to rotate the movable contact (30) about the load side electrode terminal (40).

3. The neutral transition contact assembly of claim 2, wherein, The movable contact (30) comprises a first collet (301) and a second collet (302), the first collet (301) being coupled to the second collet (302); The first connecting member (21) is disposed on a movement path of the first collet (301) to be connected to the first collet (301); The second connecting member (22) is disposed on a movement path of the second collet (302) to be connected to the second collet (302).

4. The neutral transition contact assembly of claim 3, wherein, The first stationary contact (11) comprises a pair of first protrusions (111) corresponding to the first collet (301) and the second collet (302) respectively, and the pair of first protrusions (111) are adapted to be connected to the first collet (301) and the second collet (302) respectively moving to the first stationary contact (11); The second stationary contact (12) comprises a pair of second protrusions (121) corresponding to the first clamp (301) and the second clamp (302) respectively, and the pair of second protrusions (121) are adapted to be connected with the first clamp (301) and the second clamp (302) moving to the second stationary contact (12) respectively.

5. The neutral transition contact assembly of claim 4, wherein, The first connecting piece (21) is coupled to the first protrusion (111) corresponding to the first clamp (301) in the pair of first protrusions (111), and the second connecting piece (22) is coupled to the second protrusion (121) corresponding to the second clamp (302) in the pair of second protrusions (121).

6. The neutral transition contact assembly of any of claims 3 to 5, wherein, Each of the first clamp (301) and the second clamp (302) comprises: a pair of clamping pieces (31) spaced apart and coupled together to define a clamping area (310) between the pair of clamping pieces (31) for clamping a corresponding connecting piece.

7. The neutral transition contact assembly of claim 6, wherein, Each clamp further comprises: a limiting piece (32) coupled to the pair of clamping pieces (31); and a pair of elastic pieces (33) disposed on both sides of the pair of clamping pieces (31) and coupled to the pair of clamping pieces (31) and the limiting piece (32), the pair of elastic pieces (33) being adapted to apply a force to the pair of clamping pieces (31) to move the pair of clamping pieces (31) closer to each other.

8. The neutral transition contact assembly of any of claims 3 to 5, wherein, An end of the first connecting piece (21) away from the first stationary contact (11) is provided with a first guide inclined surface (211) to guide the first connecting piece (21) to connect with the first clamp (301); An end of the second connecting piece (22) away from the second stationary contact (12) is provided with a second guide inclined surface (221) to guide the second connecting piece (22) to connect with the second clamp (302).

9. The neutral transition contact assembly of any one of claims 1 to 5, wherein, Further comprising: a support piece (50) disposed between the first stationary contact (11) and the second stationary contact (12) and coupled to the first connecting piece (21) and the second connecting piece (22).

10. A dual power transfer switch, characterized by Comprise: The neutral line conversion contact assembly according to any one of claims 1 to 9.

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