Switching device and dual power transfer switch device

Abstract

The application relates to a switching device and a double power transfer switch device, wherein the switching device comprises a normal power static contact mechanism, a standby power static contact mechanism, a first moving contact mechanism and a second moving contact mechanism; the normal / standby power static contact mechanism comprises a normal / standby power conductive row and a normal / standby power conductive arc striking piece; the normal / standby power conductive row comprises third / sixth conductive parts; the third / sixth conductive parts are provided with normal / standby power static contact points; the extension directions of the third / sixth conductive parts are the same as the extension directions of the first / second moving contact mechanisms when the first / second moving contact mechanisms abut against the normal / standby power static contact points; the normal / standby power conductive arc striking piece has first / second fixed ends and first / second free ends, the first / second fixed ends are connected to the normal / standby power conductive row, and the first / second free ends extend in the opposite direction of the extension direction of the third / sixth conductive parts; the switching device can ensure the on-off breaking capacity and the electric power stability at the same time, has excellent on-off breaking capacity and strong short-circuit current resistance.

Description

Technical Field

[0001] This invention relates to the field of dual power supply transfer switch devices, and more particularly to transfer switch devices and dual power supply transfer switch devices. Background Technology

[0002] Dual power transfer switches are common electrical distribution devices, often used in critical locations such as data centers, airports, hospitals, and sports centers where prolonged power outages are not permitted. They are used to switch between two power sources, ensuring a rapid switch to the backup power source in the event of a failure of the primary power source. This guarantees normal power supply to the load, ensuring the reliability and continuity of power supply in these critical locations, and eliminating or reducing the safety hazards and economic losses caused by power outages due to power failures.

[0003] A dual-power transfer switch supplies power to the load by connecting two independent power sources. One power source is typically AC mains power, while the other may be AC ​​mains power or a backup power source such as a generator. When the dual power supply detects a fault such as undervoltage or phase loss in the primary power source, the automatic transfer switch will automatically switch to the other power source to supply power to the load. Its principle and switching process can be summarized as follows: the controller detects power quality—the controller issues a switching command according to the design logic—the drive mechanism receives the command and performs the switching action—the main circuit contact system completes the opening and closing actions to achieve the switching between the two power sources. The main circuit contact system is primarily responsible for carrying, connecting, and disconnecting the main circuit operating current in the power distribution system. When abnormal conditions such as short circuits or overloads occur in the power distribution system, the main circuit contact system needs to quickly... To ensure that the automatic transfer switch is not damaged before the short-circuit protection device (SCPD, such as a circuit breaker or fuse) interrupts the fault current, the contact system of the dual power transfer switch must have a certain overcurrent tolerance capability. According to Ferrari's law of electromagnetic induction, a magnetic field is generated around a current-carrying conductor. Other adjacent current-carrying conductors in this magnetic field inevitably experience the Lorentz force, which manifests as either repulsive or attractive forces depending on the direction of the current. The larger the overcurrent, the stronger the magnetic field and the greater the Lorentz force. Furthermore, when current flows through the moving and stationary contacts, a repulsive force inevitably arises between them, tending towards the opening direction. The contact system must be able to resist this repulsive force and maintain stable and reliable contact. This characteristic of the contact system is called electrodynamic stability.

[0004] Therefore, improving the overcurrent breaking capacity and electrodynamic stability of contact systems is a current research direction. In related technologies, dual-power transfer switches often utilize the self-excitation of the contact system to generate a strong magnetic field between the contacts. This magnetic field rapidly lengthens and extinguishes the electric arc, while simultaneously causing the moving contact to be rapidly repelled by electrodynamic repulsion, thus lengthening and extinguishing the arc. The larger the operating current, the stronger the magnetic field and the better the breaking capacity of the contact system. However, the greater the electrodynamic repulsion experienced by the moving contact, the lower the electrodynamic stability of the contact system. Therefore, in the design of related contact systems, breaking capacity and electrodynamic stability often cannot be simultaneously achieved, making it difficult to obtain a better overall result. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a switching device and a dual power supply switching device.

[0006] The technical solution adopted by the present invention to solve its technical problem is: to construct a switching device, including a housing, a constant current stationary contact mechanism, a backup current stationary contact mechanism, a first moving contact mechanism and a second moving contact mechanism housed in the housing; the constant current stationary contact mechanism and the first moving contact mechanism, and the backup current stationary contact mechanism and the second moving contact mechanism are respectively located in the upper and lower parts of the housing;

[0007] The constant current static contact mechanism includes a constant current conductive busbar for connecting to a common power source and a constant current arc-starting piece that is conductive and electrically connected to the constant current conductive busbar.

[0008] The constant current busbar includes a third conductive portion for connecting the constant current power supply to the first moving contact mechanism; the third conductive portion is provided with a constant current stationary contact for abutting against the first moving contact mechanism; the extension direction of the third conductive portion is the same as the extension direction of the first moving contact mechanism when it abuts against the constant current stationary contact.

[0009] The constant-current arc-starting plate has a first fixed end and a first free end. The first fixed end is connected to the constant-current conductive busbar, and the first free end extends in the opposite direction to the direction of extension of the third conductive part.

[0010] The backup power stationary contact mechanism includes a backup power busbar for connecting to a backup power source and a backup power arc-starting piece that is conductive and electrically connected to the backup power busbar.

[0011] The backup power bus includes a sixth conductive part for connecting the backup power supply to the second moving contact mechanism; the sixth conductive part is provided with a backup stationary contact for abutting against the second moving contact mechanism; the extending direction of the sixth conductive part is the same as the extending direction of the second moving contact mechanism when it abuts against the backup stationary contact.

[0012] The backup arc-starting plate has a second fixed end and a second free end. The second fixed end is connected to the backup conductive busbar, and the second free end extends in the opposite direction to the direction in which the sixth conductive part extends.

[0013] Preferably, the first moving contact mechanism includes a first connecting component, a first transmission member located on the side of the first connecting component away from the second moving contact mechanism, and a first rocker arm located between the first connecting component and the first transmission member;

[0014] The first connecting assembly has a first hinge portion, a first contact portion, and a first mating portion located between the first hinge portion and the first contact portion; the first hinge portion is rotatably connected in the housing;

[0015] The two ends of the first rocker arm are respectively hinged to the first transmission member and the first hinge part; the first transmission member rotates under the transmission of the first rotating shaft, and drives the first contact part and the first mating part to rotate around the first hinge part as the base point, so that the first contact part abuts against or moves away from the constant current static contact.

[0016] Preferably, the first connecting component includes a first housing and a first conductive bus disposed inside the first housing and capable of conducting electricity;

[0017] The first conductive busbar is plate-shaped and includes a first connecting portion and a first abutting portion integrally formed with the first connecting portion;

[0018] The first connecting part is hinged to the middle of the first cover;

[0019] The first abutting portion is adjacent to the constant current conductive busbar, and its first wall surface facing the constant current conductive busbar is provided with a first proximal end near the first connecting portion and a first distal end away from the first connecting portion; the first proximal end is provided with a first moving contact for abutting the constant current static contact; the first distal end protrudes from the head of the first cover and is used to abut the constant current arc ignition plate.

[0020] Preferably, the first connecting assembly further includes a first elastic component disposed on the outer periphery of the first housing; the first elastic component is used to generate a force that presses the first moving contact tightly against the constant-current static contact when the constant-current stationary contact abuts against the first moving contact;

[0021] The first elastic component includes a first spring portion disposed at the head of the first cover, a first engaging portion located on opposite sides of the spring portion, and at least one first hook-shaped portion;

[0022] The first engaging portion is connected to a second wall surface that is opposite to the first wall surface;

[0023] The at least one first hook-shaped portion is connected to the middle of the first cover.

[0024] Preferably, the lever arm length from the connection point of the first engaging portion to the second wall surface to the middle of the first cover is greater than the lever arm length from the first moving contact point to the middle of the first cover.

[0025] Preferably, the first abutting portion is provided with a first through hole extending along the thickness direction Y of the switching device; the head of the first cover is also provided with a first connecting shaft passing through the first through hole;

[0026] The first connecting shaft passes through the first through hole, and the diameter of the first connecting shaft is smaller than the diameter of the first through hole.

[0027] Preferably, during the process of the switching device performing the normal power supply opening action from the normal power supply closing state, the first conductive busbar and the normal power static contact and the normal power arc ignition piece include a first contact state, a second contact state and a third contact state.

[0028] The first contact state is configured such that the constant current static contact abuts against the first moving contact, and a gap is formed between the first distal end and the constant current arc-leading plate;

[0029] The second contact state is configured such that the constant current static contact abuts against the first moving contact, and the first distal end abuts against the constant current arc-leading plate;

[0030] The third contact state is configured such that there is a gap between the constant static contact and the first moving contact, and the first distal end abuts against the constant arc-starting plate.

[0031] Preferably, the constant-current arc-leading plate has a V-shaped plate structure, which includes a first fixing part and a first constant-current arc-leading part integrally connected to the first fixing part; the lower end of the first fixing part is connected to the constant-current conductive busbar, and the first constant-current arc-leading part extends in the opposite direction to the direction of extension of the third conductive part along the upper end of the first fixing part.

[0032] And / or, the backup arc-starting plate has a V-shaped plate structure, which includes a second fixing part and a second constant arc-starting part integrally connected to the second fixing part; the upper end of the second fixing part is connected to the backup conductive busbar, and the second constant arc-starting part extends in the opposite direction to the extension direction of the sixth conductive part along the lower end of the second fixing part.

[0033] Preferably, the second moving contact mechanism is structurally equivalent to the first moving contact mechanism, and the second moving contact mechanism and the first moving contact mechanism are mirror-symmetrical.

[0034] The present invention also provides a dual-power transfer switch device, comprising the aforementioned transfer switch device.

[0035] The present invention has the following beneficial effects: through the design of the third conductive part, the constant current arc igniter, the sixth conductive part, and the standby arc igniter, an attractive force is obtained when the moving contact abuts against the stationary contact, so that the moving contact is tightly pressed against the stationary contact. At the same time, a repulsive force is obtained when the moving contact is separated from the stationary contact, so as to ensure the connection and disconnection capabilities while taking into account the electrodynamic stability, and has excellent connection and disconnection capabilities and strong short-circuit current withstand performance. Attached Figure Description

[0036] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0037] Figure 1 This is a schematic diagram of the external structure of the switching device in some embodiments of the present invention;

[0038] Figure 2 yes Figure 1 Longitudinal cross-sectional view of the switching device shown;

[0039] Figure 3 This is a schematic diagram of the structure between the constant current stationary contact mechanism, the backup current stationary contact mechanism, the load terminal mechanism, the first moving contact mechanism, and the second moving contact mechanism in the switching device of the present invention.

[0040] Figure 4 This is a schematic diagram of the structure of the constant current stationary contact mechanism, the backup current stationary contact mechanism, the load terminal mechanism, the first moving contact mechanism, and the second moving contact mechanism in the switching device of the present invention, when the first moving contact has just disengaged from the constant current stationary contact.

[0041] Figure 5 This is an exploded view of the first moving contact mechanism of the switching device in some embodiments of the present invention;

[0042] Figure 6 This is a longitudinal cross-sectional view of the first moving contact mechanism of the switching device in some embodiments of the present invention;

[0043] Figure 7 This is a longitudinal cross-sectional view of the switching device of the present invention in the normal power supply closed state, with the arc-extinguishing chamber omitted;

[0044] Figure 8 yes Figure 7 The longitudinal cross-sectional view of the switching device shown in the figure when it performs the normal power supply tripping action, with the first conductive busbar in the third contact state with the constant current static contact and the constant current arc ignition piece.

[0045] Figure 9 yes Figure 8The longitudinal cross-sectional view of the first conductive busbar completely detached from the constant current static contact and the constant current arc ignition piece when the switching device continues to perform the normal power supply tripping action.

[0046] Figure 10 This is a longitudinal cross-sectional view of the switching device of the present invention in a dual-state configuration, with the arc-extinguishing chamber omitted. Detailed Implementation

[0047] To provide a clearer understanding of the technical features, objectives, and effects of this invention, specific embodiments are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "upper," "lower," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or element referred to must have a specific orientation; therefore, they should not be construed as limitations on this invention.

[0048] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "linking," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. When an component is referred to as being "on" or "below" another component, the component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," "third," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0049] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the invention with unnecessary detail.

[0050] See also Figures 1 to 3As shown, a dual-power transfer switch device includes a contact device, a control device, and an operating device. The contact device includes multiple poles joined together to form a transfer switch 100, each equipped with terminals for electrically connecting a main power supply, a backup power supply, and a load. The operating device includes a rotatable first drive shaft 201 and a second drive shaft 202. The first drive shaft 201 and the second drive shaft 202 are parallel to each other, with the first drive shaft 201 passing through a first rocker arm 52 in the transfer switch 100 along the thickness direction Y, and the second drive shaft 202 passing through a second rocker arm 62 in the transfer switch 100 along the thickness direction Y. The control device can control the rotation of either the first drive shaft 201 or the second drive shaft 202, thereby driving the first rocker arm 52 or the second rocker arm 62 to rotate. The first rocker arm 52 and the second rocker arm 62 rotate in a plane perpendicular to the first drive shaft 201 and the second drive shaft 202; the direction of their rotation is either from the length direction X of the switching device 100 to the height direction H of the switching device 100, or from the height direction H to the length direction X. When the first rocker arm 52 or the second rocker arm 62 rotates, the electrical connection between the main power supply or the backup power supply and the load can be established / disconnected, thereby enabling the switching device 100 to switch to the main power supply closed, the backup power supply closed, or the switch gate in a dual-open state.

[0051] It should be noted that other necessary components and control devices of the operating device can be referred to the existing technology, and will not be elaborated here.

[0052] like Figure 2 As shown, in some embodiments, the switching device 100 includes an insulating housing 1, a normally energized stationary contact mechanism 2, a backup stationary contact mechanism 3, a load terminal mechanism 4, a first moving contact mechanism 5, and a second moving contact mechanism 6 housed within the housing 1. The normally energized stationary contact mechanism 2 and the backup stationary contact mechanism 3 are located at one end in the length direction X, with the normally energized stationary contact mechanism 2 positioned above the backup stationary contact mechanism 3. The load terminal mechanism 4 is located at the opposite end in the length direction X. The first moving contact mechanism 5 and the second moving contact mechanism 6 are located between the normally energized stationary contact mechanism 2 and the backup stationary contact mechanism 3 and the load terminal mechanism 4, with the first moving contact mechanism 5 positioned above the second moving contact mechanism 6. The first moving contact mechanism 5 and the second moving contact mechanism 6 have comparable structures and operate on the same principle; they are longitudinally mirror-symmetrically distributed within the housing 1.

[0053] One end of the constant current static contact mechanism 2 is used to connect to the main power supply; one end of the backup current static contact mechanism 3 is used to connect to the backup power supply; and one end of the load terminal mechanism 4 is used to connect to the load.

[0054] The first moving contact mechanism 5, the first drive shaft 201, and the normally powered static contact mechanism 2 belong to the normal operating side and are used to realize the closing / opening of the normal operating power supply. One end of the first moving contact mechanism 5 is mechanically and electrically connected to the load terminal mechanism 4, and the other end of the first moving contact mechanism 5 is connected to the first drive shaft 201. Under the rotation of the first rotating shaft, the first moving contact mechanism 5 can press against the normally powered static contact mechanism 2 to electrically connect the normally powered static contact mechanism 2 and the load terminal mechanism 4.

[0055] The second moving contact mechanism 6, the second drive shaft 202, and the standby stationary contact mechanism 3 belong to the standby side and are used to realize the closing / opening of the standby power supply. One end of the second moving contact mechanism 6 is mechanically and electrically connected to the load terminal mechanism 4, and the other end of the second moving contact mechanism 6 is connected to the second drive shaft 202. Under the rotation of the second rotating shaft, the second moving contact mechanism 6 can press against the standby stationary contact mechanism 3 to electrically connect the standby stationary contact mechanism 3 and the load terminal mechanism 4.

[0056] In some embodiments, the switching device 100 may further include a first arc-extinguishing chamber 7 and a second arc-extinguishing chamber 8 disposed within the housing 1. Understandably, when the contacts break, an electric arc will be generated at the contact point between the normally energized stationary contact mechanism 2 and the first moving contact mechanism 5 and / or the standby stationary contact mechanism 3 and the second moving contact mechanism 6. The arc-extinguishing chamber can rapidly cool and extinguish the arc. The high-temperature conductive ionized gas generated during contact breakage passes through the arc-extinguishing chamber and is discharged from the channel reserved in the housing 1. The mechanism of arc generation and the working principle of the arc-extinguishing chamber can be found in existing technology and will not be elaborated here. The arc-extinguishing chamber ensures the electrical distance between the stationary contact mechanism and the moving contact mechanism after contact breakage, improving safety and breaking capacity.

[0057] In some embodiments, the first arc-extinguishing chamber 7 is located at the front end of the first conductive bar 512 of the first moving contact mechanism 5 when it abuts against the constant current stationary contact mechanism 2, and the second arc-extinguishing chamber 8 is located at the front end of the second conductive bar of the second moving contact mechanism 6 when it abuts against the standby stationary contact mechanism 3. The housing 1 has two channels reserved for the discharge of high-temperature conductive ionizing gas, one above the other, which improves safety.

[0058] like Figure 1 , Figure 2 As shown, in some embodiments, the housing 1 is generally cuboid and may include a first half-shell 11 and a second half-shell 12 connected together, and a plurality of protrusions respectively provided in the first half-shell 11 and the second half-shell 12; when the first half-shell 11 and the second half-shell 12 are connected together, the plurality of protrusions can form a plurality of assembly spaces, and the constant current static contact mechanism 2, the backup current static contact mechanism 3, the load terminal mechanism 4, the first moving contact mechanism 5 and the second moving contact mechanism 6 can be embedded in the corresponding assembly spaces to be securely fixed in the housing 1.

[0059] In some embodiments, the housing 1 is further provided with an isolation strip 111 between the first moving contact mechanism 5 and the second moving contact mechanism 6. The isolation strip 111 is parallel to the length direction X and is used to separate the first moving contact mechanism 5 and the second moving contact mechanism 6, thereby improving safety.

[0060] like Figure 3 As shown, in some embodiments, the constant current stationary contact mechanism 2 may include a constant current conductive busbar 21, a constant current stationary contact 22, a constant current arc-inducing plate 23, and a constant current terminal block 24. The constant current conductive busbar 21 is a conductive plate-like structure that serves as a connector and conductor; the constant current terminal block 24 is connected to the end of the constant current conductive busbar 21 away from the first moving contact mechanism 5 and is used to connect to a constant current power supply; the constant current stationary contact 22 is located at the end of the constant current conductive busbar 21 close to the first moving contact mechanism 5 to abut against the first moving contact mechanism 5; the constant current arc-inducing plate 23 is located between the constant current stationary contact 22 and the constant current terminal block 24, and is located below the first arc-extinguishing chamber 7; the constant current arc-inducing plate 23 is connected to the constant current conductive busbar 21 and can abut against the first abutting part 5121 in the first moving contact mechanism 5 to guide the arc to be generated between the constant current arc-inducing plate 23 and the first abutting part 5121, effectively protecting the first moving contact 54 in the first moving contact mechanism 5.

[0061] In some embodiments, the constant-current busbar 21 may include a first conductive portion 211, a second conductive portion 212, and a third conductive portion 213 connected in sequence. The first conductive portion 211 is relatively far from the first moving contact mechanism 5, and in some embodiments it is generally Z-shaped. The upper part of the first conductive portion 211 is parallel to the length direction X and is used for the constant-current terminal 24 to pass through it. The lower part of the first conductive portion 211 extends toward the second conductive portion 212 and is used to connect the second conductive portion 212. The second conductive portion 212 extends upward from the lower part of the first conductive portion 211 at an angle to the first moving contact mechanism 5 and is used for the constant-current arc-starting piece 23 to be fixed thereon. The third conductive portion 213 extends downward from the second conductive portion 212 along the extension direction parallel to the first conductive busbar 512 abutting the constant-current stationary contact 22. The third conductive portion 213 has an upper wall surface on which the constant-current stationary contact 22 is disposed, and this upper wall surface is relative to the first moving contact mechanism 5. Preferably, the first conductive part 211, the second conductive part 212 and the third conductive part 213 are integrally formed.

[0062] In some embodiments, the constant-current arc-inducing plate 23 may be a V-shaped plate structure, which may include a first fixing part 231 and a first constant-current arc-inducing part 232 integrally connected to the first fixing part 231. The first fixing part 231 is in close contact with the second conductive part 212 of the constant-current conductive busbar 21, and can be fixed to the second conductive part 212 by a bolt. The first constant-current arc-inducing part 232 is vertically connected above the first fixing part 231, and its extension direction is parallel to the extension direction of the first conductive busbar 512 of the first moving contact mechanism 5 when it abuts against the constant-current stationary contact 22; the first constant-current arc-inducing part 232 is provided with an upper wall surface relative to the first arc-extinguishing chamber 7, which can abut against the first abutting part 5121 of the first conductive busbar 512.

[0063] like Figure 3 As shown, in some embodiments, the first moving contact mechanism 5 may include a first connecting assembly 51, a first rocker arm 52, a first transmission member 53, and a first connecting belt 55. The first connecting assembly 51 has a first hinge portion, a first contact portion, and a first mating portion located between the first hinge portion and the first contact portion. The first hinge portion is rotatably connected to the housing 1; the first contact portion is provided with a first moving contact 54 for abutting against the constant current static contact 22 of the constant current static contact mechanism 2; and the first mating portion is used to connect with the first transmission member 53. Preferably, the first rocker arm 52 is hinged to the first transmission member 53, and the first transmission member 53 is hinged to the first mating portion of the first connecting assembly 51, so that the first connecting assembly 51 can rotate around the first hinge portion of the first connecting assembly 51 as a base point under the drive of the first rocker arm 52, so that the first contact portion of the first connecting assembly 51 abuts against or moves away from the constant current static contact 22. In addition, the first connecting band 55 is used to establish an electrical connection between the first connecting component 51 and the load terminal mechanism 4.

[0064] In some embodiments, the first rocker arm 52 is located above the first connecting assembly 51 and the load stationary contact mechanism 4. The first rocker arm 52 includes two ends, the first end of which is relatively fixedly sleeved on the first drive shaft 201 disposed in the housing 1, and the second end of which is used to be hinged to the first transmission member 53.

[0065] In some embodiments, the first transmission member 53 is located between the first rocker arm 52 and the first connecting assembly 51 to perform a transmission function. The first transmission member 53 has an I-shaped structure and includes four symmetrical ends. Its two symmetrical ends are hinged to the second end of the first rocker arm 52, and its other symmetrical ends are hinged to the first mating part of the first connecting assembly 51.

[0066] like Figures 4 to 6As shown, in some embodiments, the first connection component 51 may include a first support component 511, a first conductive bus 512 disposed within the first support component 511, and a first elastic component 513 disposed on the outer periphery of the first support component 511.

[0067] In some embodiments, the first support component 511 may include an inverted U-shaped first housing 5111 and a first connecting shaft 5112, a second connecting shaft 5113, and a third connecting shaft 5114 that pass through the first housing 5111 along the thickness direction Y. The first housing 5111 includes a first head 5111a, a first tail 5111b relative to the first head 5111a, and a first middle portion 5111c located between the first head 5111a and the first tail 5111b. The first head 5111a is adjacent to the constant current static contact 22 of the constant current static contact mechanism 2. A first connecting shaft 5112 passes through and is fixed to the first head 5111a of the first housing 5111, and its length is greater than the length of the first housing 5111 in the thickness direction Y. A second connecting shaft 5113 passes through and is fixed to the first middle portion 5111c of the first housing 5111, and its length is greater than the length of the first housing 5111 in the thickness direction Y. A third connecting shaft 5114 passes through the first tail 5111b of the first housing 5111 and is fixed to the housing 1. The first housing 5111 can rotate in a plane perpendicular to the thickness direction Y with the third connecting shaft 5114 as the base point.

[0068] In some embodiments, the first conductive busbar 512 is a plate-shaped conductive structure, including a first connecting portion 5122 and a first abutting portion 5121 integrally formed with the first connecting portion 5122. The first abutting portion 5121 is adjacent to the constant-current conductive busbar 21 relative to the first connecting portion 5122. The first abutting portion 5121 has a first wall surface facing the constant-current conductive busbar 21, a second wall surface opposite to the first wall surface, and a first through hole 5121a located between the first wall surface and the second wall surface. The first wall surface includes a first proximal end 5121b near the first connecting portion 5122 and a first distal end 5121c away from the first connecting portion 5122; a first moving contact 54 is provided at the first proximal end 5121b; the first distal end 5121c of the first wall surface serves as an arc-inducing portion and can abut against the first constant-current arc-inducing portion 232 of the constant-current stationary contact mechanism 2. A V-shaped first slot 5121d is provided on the second wall surface for cooperating with the first elastic component 513. A first through hole 5121a extends through the first abutment portion 5121 along the thickness direction Y, for the first connecting shaft 5112 to pass through; the diameter of the first through hole 5121a is larger than the diameter of the first connecting shaft 5112. The first connecting portion 5122 is provided with a second through hole 5122a for the second connecting shaft 5113 to pass through, and the diameter of the second through hole 5122a is adapted to the second connecting shaft 5113.

[0069] like Figure 7 As shown, the extension direction of the first wall is A, and the extension direction of the third conductive part 213 or the first normally powered arc-leading part 232 is B. The connection between direction A and direction B can form an angle θ, so that when the first moving contact 54 is in complete contact with the normally powered stationary contact 22, a gap 514 is formed between the third conductive part 213 and the first distal end 5121c of the first wall.

[0070] Understandably, the first conductive busbar 512 can rotate with the second connecting shaft 5113 as the base point. Since the diameter of the first through hole 5121a is larger than the diameter of the first connecting shaft 5112, the first conductive busbar 512 can rotate relative to the first cover 5111 when the first moving contact mechanism 5 rotates.

[0071] In some embodiments, the first elastic component 513 is a double torsion spring, comprising a first spring portion 5131, first engaging portions 5132 located on opposite sides of the first spring portion 5131, and two first hook-shaped portions 5133. In some embodiments, the first spring portion 5131 may include two opposing and spaced-apart first spring coils, which are respectively fitted onto the outer periphery of the first connecting shaft 5112. The two first hook-shaped portions 5133 are J-shaped and extend from the two first spring coils toward the second connecting shaft 5113; the two first hook-shaped portions 5133 are parallel to each other and are fitted onto the outer periphery of the second connecting shaft 5113. The first engaging portions 5132 are used to engage with the first slot 5121d of the first abutment portion 5121. In some embodiments, the first engaging portion 5132 is U-shaped, with its two ends integrally connected to the two first spring coils.

[0072] During assembly, the first cover 5111 covers the first conductive bus 512 from above, and the second connecting shaft 5113 and the third connecting shaft 5114 are inserted from the outer periphery of the first cover 5111 to position the first conductive bus 512 inside the first cover 5111. At the same time, the first distal end 5121c of the first abutting part 5121 protrudes from the first head 5111a of the first cover 5111 and extends into the first arc-extinguishing chamber 7, located above the second conductive part 212 of the constant current conductive bus 21. The two first spring coils of the first spring portion 5131 are respectively sleeved on the outer periphery of the first connecting shaft 5112 and located on opposite sides of the first cover 5111; the first engaging portion 5132 is fastened in the first slot 5121d of the first abutting portion 5121, and the two first hook-shaped portions 5133 are respectively sleeved on the outer periphery of the second connecting shaft 5113, at which time the two first hook-shaped portions 5133 are located on opposite sides of the first cover 5111.

[0073] In some embodiments, the first moving contact 54 is welded to the first proximal end 5121b of the first abutment portion 5121.

[0074] In some embodiments, the first connecting strip 55 is a flexible copper braided wire, with its two ends connected to the first conductive bar 512 of the first connecting assembly 51 and the load conductive bar 41 of the load stationary contact mechanism 4, respectively.

[0075] Understandably, the first moving contact 54 forms the first contact portion of the first connecting assembly 51, the first connecting portion 5122, the first middle portion 5111c of the first cover 5111, and the second connecting shaft 5113 form the first mating portion of the first connecting assembly 51, and the first tail portion 5111b of the first cover 5111 and the third connecting shaft 5114 form the first hinge portion of the first connecting assembly 51. The first rocker arm 52, the first transmission member 53, the first cover 5111, and the housing 1 form a parallel four-bar linkage structure; the first rotating shaft, the hinge point between the first rocker arm 52 and the first transmission member 53, the second connecting shaft 5113, and the third connecting shaft 5114 serve as the four rotation points of the parallel four-bar linkage structure.

[0076] See below Figure 3 , Figure 4 as well as Figures 7 to 10 This section provides a detailed description of the device's operation process from the normally powered power supply closed state to the normally powered power supply open state.

[0077] See Figure 3 , Figure 7 The diagram shows the device in the normal power supply closed state (fully closed). At this time, the constant current stationary contact 22 abuts against the first moving contact 54, and the first constant current arc-inducing part 232 of the constant current stationary contact mechanism 2 and the first abutting part 5121 of the first moving contact mechanism 5 have a gap 514. The extension direction of the third conductive part 213 of the constant current stationary contact mechanism 2 and the first conductive bar 512 of the first moving contact mechanism 5 are parallel to each other, and their extension direction can form an angle with the length direction X.

[0078] At this time, when the current flows from the constant current stationary contact mechanism 2 through the first moving contact mechanism 5 to the load terminal mechanism 4, the current flow direction E of the third conductive part 213 of the constant current stationary contact mechanism 2 and the first conductive bus 512 of the first moving contact mechanism 5 is the same. According to Ampere's law, the two parallel conductors will generate an attraction force when current flows in the same direction. An electromagnetic attraction force is generated between the constant current conductive bus 21 and the first conductive bus 512, thereby pressing the constant current stationary contact 22 and the first moving contact 54 together, thereby obtaining excellent overcurrent withstand performance and contact contact reliability.

[0079] At the same time, the torque of the first elastic component 513 acts on the second wall surface of the first abutment portion 5121 of the first conductive busbar 512, providing a pressure to press the first moving contact 54 tightly against the constant current stationary contact 22. Understandably, when the first rocker arm 52 and the first transmission member 53 drive the first connecting assembly 51 from the initial closing state to the fully closing state, the force applied by the first rocker arm 52 and the first transmission member 53 to the first connecting assembly 51 in the closing direction causes the deformation of the first elastic component 513 to increase. The increased torque of the first elastic component 513 pushes the first conductive bus 512 to rotate around the second connecting shaft 5113, converting the force applied by the first rocker arm 52 and the first transmission member 53 to the first connecting assembly 51 in the closing direction into a pressure that presses the first moving contact 54 down onto the constant current stationary contact 22. In addition, the lever arm between the point of action of the first elastic component 513 on the second wall and the second connecting shaft 5113 is longer than the lever arm between the first moving contact 54 and the second connecting shaft 5113. According to the lever principle, this force is amplified. Under the superposition of electromagnetic attraction and the amplified pressure, the contact between the constant current stationary contact 22 and the first moving contact 54 is very stable, thereby obtaining better overcurrent withstand performance and contact reliability.

[0080] When the first moving contact mechanism 5 first performs the opening action, under the force applied by the first elastic component 513, the first distal end 5121c of the first abutting part 5121 abuts against the first normally energized arc-inducing part 232. Simultaneously, the first moving contact 54 is still in contact with the normally energized stationary contact 22. (See reference...) Figure 4 as well as Figure 8 When the first moving contact mechanism 5 continues to rotate, the first moving contact 54 first disengages from the constant-current stationary contact 22. Under the force applied by the first elastic component 513, the first constant-current arc-inducing part 232 and the first abutting part 5121 remain in contact with each other, so that no electric arc is generated between the first moving contact 54 and the constant-current stationary contact 22. When the first moving contact mechanism 5 continues to rotate, the first abutting part 5121 disengages from the first constant-current arc-inducing part 232, and an electric arc is generated between the first abutting part 5121 and the first constant-current arc-inducing part 232, thereby effectively protecting the first moving contact 54 and the constant-current stationary contact 22.

[0081] Secondly, when the first moving contact 54 disengages from the constant current stationary contact 22, the current flows from the first constant current arc-inducing part 232 to the first abutting part 5121. At this time, the currents at the first constant current arc-inducing part 232 and the first conductive bus 512 flow in opposite directions to E. According to Ampere's law, the repulsive force will be generated when two parallel conductors flow with opposite currents. An electromagnetic repulsive force is generated between the first constant current arc-inducing part 232 and the first conductive bus 512, which accelerates the opening speed of the first moving contact mechanism 5, rapidly lengthens the arc, extinguishes the arc, and improves the recovery strength of the medium between the constant current conductive bus 21 and the first conductive bus 512, thereby preventing the arc from reigniting and improving the breaking capacity.

[0082] In addition, the magnetic field generated in the arc gap by the constant current busbar 21 will produce a Lorentz force on the arc, causing the arc to elongate towards the arc-extinguishing chamber and enter the first arc-extinguishing chamber 7, thereby accelerating the cooling and extinguishing of the arc and improving the breaking capacity.

[0083] Furthermore, during the closing operation of the first moving contact mechanism 5, the first abutting part 5121 first abuts against the first constant current arc-inducing part 232 under the force applied by the first elastic component 513. Subsequently, the first moving contact 54 abuts against the constant current stationary contact 22. At this time, the first moving contact 54 and the constant current stationary contact 22 are not yet in a fully closed state. As the first moving contact mechanism 5 continues to rotate until the device is in a fully closed state for normal power supply, the constant current stationary contact 22 and the first moving contact 54 are fully abutted. At the same time, the first abutting part 5121 disengages from the contact with the first constant current arc-inducing part 232, and a gap 514 is formed between the first constant current arc-inducing part 232 and the first abutting part 5121, effectively preventing the first conductive bus 512 from bouncing and arcing, which could damage the constant current stationary contact 22 and the first moving contact 54.

[0084] In some embodiments, the backup static contact mechanism 2 may include a backup power busbar 31, a backup static contact 32, a backup arc ignition piece 33, and a backup terminal block 34.

[0085] In some embodiments, the backup power busbar 31 is a plate-like structure, which may include a fourth conductive part 311, a fifth conductive part 312, and a sixth conductive part 313 connected in sequence. In some embodiments, the fourth conductive part 311 is generally Z-shaped, with a backup power terminal 34 passing through one end and the other end connected to the fifth conductive part 312. The fifth conductive part 312 and the sixth conductive part 313 are mirror-symmetrical to the second conductive part 212 and the third conductive part 213 respectively, with the isolation strip 111 as the boundary. The specific structure, connection relationship, and function of the fifth conductive part 312 and the sixth conductive part 313 can be referred to the second conductive part 212 and the third conductive part 213, and will not be described in detail here.

[0086] The standby static contact 32 is located on the wall of the sixth conductive part 313 facing the second moving contact mechanism 6.

[0087] Similarly, the backup arc ignition piece 33 includes a second fixing part 331 and a second constant-current arc ignition part 332 integrally connected to the second fixing part 331. The specific structure, connection relationship and function of the two can be referred to the first fixing part 231 and the first constant-current arc ignition part 232 of the constant-current arc ignition piece 23, and will not be described in detail here.

[0088] In some embodiments, the second moving contact mechanism 6 is mirror-symmetrical to the first moving contact mechanism 5, with the isolation strip 111 as the boundary. The second moving contact mechanism 6 may include a second connecting component 61, a second rocker arm 62, a second transmission component 63, a second moving contact 64, and a second connecting strip 65. The specific structure, connection relationship, and function of the second connecting component 61, the second rocker arm 62, the second transmission component 63, the second moving contact 64, and the second connecting strip 65 can be referenced to the first connecting component 51, the first rocker arm 52, the first transmission component 53, the first moving contact 54, and the first connecting strip 55, and will not be elaborated upon here.

[0089] Understandably, the process and principle of the standby side are the same as those of the commonly used side, but in the opposite direction; the cooperation relationship between the second moving contact mechanism 6 and the standby stationary contact mechanism 3 can be referred to the relationship between the first moving contact mechanism 5 and the normally powered stationary contact mechanism 2, which will not be elaborated here.

[0090] It is understood that the above embodiments only illustrate preferred embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can freely combine the above technical features without departing from the concept of the present invention, and can also make several modifications and improvements, all of which fall within the protection scope of the present invention. Therefore, all equivalent transformations and modifications made with respect to the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A switching device, comprising a housing (1), a normally powered static contact mechanism (2), a backup static contact mechanism (3), a first moving contact mechanism (5), and a second moving contact mechanism (6) housed in the housing (1); the normally powered static contact mechanism (2) and the first moving contact mechanism (5), and the backup static contact mechanism (3) and the second moving contact mechanism (6) are respectively located in the upper and lower parts of the housing (1); Its features are, The constant current static contact mechanism (2) includes a constant current conductive bus (21) for connecting to a common power source and a constant current arc igniter (23) that is conductive and electrically connected to the constant current conductive bus (21). The constant current busbar (21) includes a third conductive part (213) for connecting the constant current power supply to the first moving contact mechanism (5); the third conductive part (213) is provided with a constant current stationary contact (22) for abutting against the first moving contact mechanism (5); the extension direction of the third conductive part (213) is the same as the extension direction of the first moving contact mechanism (5) when it abuts against the constant current stationary contact (22); The constant-current arc-starting plate (23) has a first fixed end and a first free end. The first fixed end is connected to the constant-current conductive bus (21), and the first free end extends in the opposite direction to the extension direction of the third conductive part (213). The standby static contact mechanism (3) includes a standby power bus (31) for connecting to a standby power supply and a standby arc igniter (33) that is conductive and electrically connected to the standby power bus (31). The backup power bus (31) includes a sixth conductive part (313) for connecting the backup power supply to the second moving contact mechanism (6); the sixth conductive part (313) is provided with a backup stationary contact (32) for abutting against the second moving contact mechanism (6); the extension direction of the sixth conductive part (313) is the same as the extension direction of the second moving contact mechanism (6) when it abuts against the backup stationary contact (32); The backup arc-starting plate (33) has a second fixed end and a second free end. The second fixed end is connected to the backup conductive busbar (31), and the second free end extends in the opposite direction to the extension direction of the sixth conductive part (313). The first moving contact mechanism (5) includes a first connecting component (51). The first connection component (51) includes a first conductive bus (512) that is capable of conducting electricity; The first conductive bus (512) is plate-shaped and includes a first abutting portion (5121) adjacent to the constant conductive bus (21); the first abutting portion (5121) has a first proximal end (5121b) and a first distal end (5121c) on a first wall surface facing the constant conductive bus (21); the first proximal end (5121b) has a first moving contact (54) for abutting the constant static contact (22). When the first moving contact mechanism (5) starts to perform the opening action, the first distal end (5121c) abuts against the first free end of the constant current arc ignition piece (23), and the first moving contact (54) is in a contact state abutting against the constant current stationary contact (22). When the first moving contact mechanism (5) continues to rotate, the first moving contact (54) disengages from the constant static contact (22), and the first distal end (5121c) remains in contact with the first free end of the constant arc-leading plate (23). When the first moving contact mechanism (5) continues to rotate, the first distal end (5121c) disengages from the constant electric arc ignition piece (23).

2. The switching device according to claim 1, characterized in that, The first moving contact mechanism (5) further includes a first transmission member (53) located on the side of the first connecting assembly (51) away from the second moving contact mechanism (6) and a first rocker arm (52) located between the first connecting assembly (51) and the first transmission member (53). The first connecting assembly (51) has a first hinge portion, a first contact portion, and a first mating portion located between the first hinge portion and the first contact portion; the first hinge portion is rotatably connected in the housing (1); The first moving contact (54) forms the first contact portion; the two ends of the first rocker arm (52) are respectively hinged to the first transmission member (53) and the first hinge portion; the first transmission member (53) rotates under the transmission of the first rotating shaft (201), and drives the first contact portion and the first mating portion to rotate around the first hinge portion as the base point, so that the first contact portion abuts against or moves away from the constant current static contact (22).

3. The switching device according to claim 2, characterized in that, The first connecting assembly (51) further includes a first housing (5111); the first conductive bus (512) is disposed inside the first housing (5111), and the first distal end (5121c) protrudes from the head of the first housing (5111); The first conductive bus (512) further includes a first connecting portion (5122), which is integrally combined with the first abutting portion (5121); wherein the first proximal end (5121b) is disposed close to the first connecting portion (5122), and the first distal end (5121c) is disposed away from the first connecting portion (5122). The first connecting part (5122) is hinged to the middle of the first cover (5111).

4. The switching device according to claim 3, characterized in that, The first connecting component (51) further includes a first elastic component (513) disposed on the outer periphery of the first housing (5111); the first elastic component (513) is used to generate a force that presses the first moving contact (54) tightly against the constant-current static contact (22) when the constant-current static contact (22) abuts against the first moving contact (54); The first elastic component (513) includes a first spring portion (5131) disposed at the head of the first cover (5111), a first engaging portion (5132) located on opposite sides of the spring portion (5131), and at least one first hook-shaped portion (5133). The first engaging part (5132) is connected to a second wall surface opposite to the first wall surface; The at least one first hook-shaped portion (5133) is connected to the middle of the first cover (5111).

5. The switching device according to claim 4, characterized in that, The lever arm length from the connection point of the first engaging part (5132) to the second wall to the middle of the first cover (5111) is greater than the lever arm length from the first moving contact (54) to the middle of the first cover (5111).

6. The switching device according to claim 3, characterized in that, The first abutting part (5121) is provided with a first through hole (5121a) extending through the thickness direction Y of the switching device; the head of the first cover (5111) is also provided with a first connecting shaft (5112) passing through the first through hole (5121a). The first connecting shaft (5112) passes through the first through hole (5121a), and the diameter of the first connecting shaft (5112) is smaller than the diameter of the first through hole (5121a).

7. The switching device according to claim 3, characterized in that, During the process of the switching device performing the normal power supply opening action from the normal power supply closing state, the first conductive bus (512) and the normal power static contact (22) and the normal power arc ignition piece (23) include a first contact state, a second contact state and a third contact state. The first contact state is configured such that the constant static contact (22) abuts against the first moving contact (54), and a gap (514) is formed between the first distal end (5121c) and the constant arc-leading plate (23). The second contact state is configured such that the constant static contact (22) abuts against the first moving contact (54), and the first distal end (5121c) abuts against the constant arc-leading piece (23). The third contact state is configured such that there is a gap between the constant static contact (22) and the first moving contact (54), and the first distal end (5121c) abuts against the constant arc-drawing plate (23).

8. The switching device according to claim 1, characterized in that, The constant-current arc-leading plate (23) has a V-shaped plate structure, including a first fixing part (231) and a first constant-current arc-leading part (232) integrally connected to the first fixing part (231); the lower end of the first fixing part (231) is connected to the constant-current conductive bus (21), and the first constant-current arc-leading part (232) extends in the opposite direction to the extension direction of the third conductive part (213) along the upper end of the first fixing part (231); And / or, the backup arc-starting plate (33) has a V-shaped plate structure, which includes a second fixing part (331) and a second constant arc-starting part (332) integrally connected to the second fixing part (331); the upper end of the second fixing part (331) is connected to the backup conductive bus (31), and the second constant arc-starting part (332) extends in the opposite direction to the extension direction of the sixth conductive part (313) along the lower end of the second fixing part (331).

9. The switching device according to any one of claims 1 to 7, characterized in that, The second moving contact mechanism (6) is structurally equivalent to the first moving contact mechanism (5), and the second moving contact mechanism (6) and the first moving contact mechanism (5) are distributed in the housing (1) in a mirror-symmetrical manner.

10. A dual-power transfer switch device, characterized in that, Includes the switching device according to any one of claims 1 to 9.

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