A contact assembly, a contact system, a single-contact relay, and a changeover switch.

Abstract

A contact assembly, contact system, single-contact relay, and changeover switch device are disclosed, comprising a stationary contact assembly and a moving contact. The stationary contact assembly includes a first stationary contact and a second stationary contact separated by an insulating gap. One end of the moving contact is electrically connected to one end of the first stationary contact in a movable manner, and the other end of the moving contact is disposed corresponding to the second stationary contact. Under external force, the moving contact rotates relative to the first stationary contact, making conductive contact or separating from the corresponding second stationary contact. This single-set contact assembly can be used in a relay to form a single-contact relay, improving contact reliability. When at least one set of contact assemblies is used in a contact system and changeover switch device, it can realize the switching of at least two circuit operating states, improving contact reliability and arc extinguishing capability.

Description

Technical Field

[0001] This invention relates to the field of circuits, specifically to electric vehicles and other DC power distribution fields, and particularly to contact assemblies for switching devices, contact systems using such contact assemblies, single-contact relays, and changeover switching devices. Background Technology

[0002] As a switching device in a circuit, a relay's basic structure includes two insulated stationary contacts and a moving contact. In the separated state, the moving contact is insulated from the two stationary contacts and is supported by a support assembly. The drive mechanism is connected to the support assembly, and the drive mechanism drives the support assembly to move the moving contact linearly, so that the two ends of the moving contact make conductive contact with the two stationary contacts, thus achieving conduction between the two stationary contacts.

[0003] This structure has two contact points. During the countless switching operations of the relay, the two ends of the moving contact plate will also make and separate from the two stationary contacts countless times. This causes great wear on the contact points where the two ends of the moving contact plate contact the stationary contacts. In addition, the force when the two ends of the moving contact plate contact the corresponding stationary contacts is different. Over time, the wear degree of the contact points between the two ends of the moving contact plate and the stationary contacts is different. When one end of the moving contact plate makes reliable contact with the corresponding stationary contact, the contact point between the moving contact plate and the stationary contact becomes poor due to severe contact wear, so that the two stationary contacts cannot be reliably connected. Summary of the Invention

[0004] The purpose of this invention is to provide a contact assembly in which one end of a moving contact is movably connected to a first stationary contact, so that only one end of the moving contact makes conductive contact with the stationary contact, thereby achieving conduction of the contact assembly. By using single-point contact, the contact reliability is improved, avoiding poor contact caused by long-term wear of the two contact ends of traditional relay contact assemblies. Applying the single-set contact assembly of this invention to contact systems and single-contact relays can improve contact reliability. When two sets of the contact assemblies of this invention are applied to a changeover switch device, the switching of at least two circuit states can be realized.

[0005] To achieve the above objectives, the present invention provides a contact assembly comprising a stationary contact assembly and a moving contact. The stationary contact assembly includes a first stationary contact and a second stationary contact that are insulated from each other. One end of the moving contact is electrically connected to one end of the first stationary contact in a movable manner, and the other end of the moving contact is disposed corresponding to the second stationary contact. Under the drive of an external force, the moving contact rotates relative to the first stationary contact and makes conductive contact or separates from the corresponding second stationary contact.

[0006] Furthermore, the moving contact and the first stationary contact are rotatably abutted.

[0007] Furthermore, the contact point between the moving contact and at least one of the first stationary contacts is configured as an arc-shaped surface, so that the moving contact and the first stationary contact can rotatably contact each other.

[0008] Furthermore, the contact points between the moving contact and the first stationary contact are both configured as arc-shaped surfaces, allowing the moving contact and the first stationary contact to rotatably contact each other via the arc-shaped mating surfaces.

[0009] Furthermore, an elastic element is provided at the contact point between the first stationary contact and the moving contact, the elastic element causing the moving contact to press firmly against the first stationary contact.

[0010] Furthermore, the elastic element is in a compressed or stretched state, and the elastic element rotates with the rotation of the moving contact.

[0011] Furthermore, when the elastic element is in a stretched state, one end of the elastic element is rotatably disposed on the first stationary contact, and the other end is rotatably disposed at the end of the moving contact that abuts against the first stationary contact.

[0012] Furthermore, when the elastic element is in a stretched state, the direction of the elastic force of the elastic element is always consistent with the direction of the force acting on the first stationary contact when the moving contact comes into contact with it.

[0013] Furthermore, a fixed hanging point or a hanging structure is respectively provided on the end of the first stationary contact and the moving contact that abuts against each other. One end of the elastic element is rotatably provided on the fixed hanging point or the hanging structure on the first stationary contact, and the other end of the elastic element is rotatably provided on the fixed hanging point or the hanging structure on the moving contact.

[0014] Furthermore, a rotating mating surface is provided on the lower surface of the abutting end of the moving contact away from the abutting point of the first stationary contact. A suspended member is provided at the rotating mating surface for rotatable engagement as the hanging structure. Second fixing members are provided on opposite sides of the first stationary contact above the end of the first stationary contact that abuts with the moving contact as the fixing hanging points. The two ends of the suspended member are rotatably connected to the second fixing member through the elastic element.

[0015] Furthermore, when the elastic element is in a compressed state, one end of the elastic element facing the first stationary contact abuts against the abutting end of the moving contact, while the other end away from the first stationary contact is fixedly disposed and does not contact the moving contact.

[0016] Furthermore, a receiving notch is provided on at least one side of the abutting end of the moving contact, and the elastic element is disposed in the receiving notch, with one end abutting the moving contact and the other end fixedly disposed away from the first stationary contact.

[0017] Furthermore, fixed support members are respectively provided on opposite sides of the moving contact, and oblong holes are provided on the fixed support members. First fixing members are provided on both sides of the end of the moving contact that abuts against the first stationary contact. The two ends of the first fixing members are disposed in the oblong holes. The oblong holes have space for the first fixing members to move linearly toward the first stationary contact, and space for the moving contact to rotate. One end of the elastic element abuts against the moving contact, and the other end abuts against the fixed support members.

[0018] This invention provides a contact system comprising at least two sets of contact assemblies, each set of contact assemblies including a stationary contact and a moving contact, wherein at least one set is the contact assembly of this invention; the contact system achieves conduction or separation through the conductive contact and separation between the moving contact and the stationary contact.

[0019] Furthermore, the moving contact of each group of contact assemblies rotates relative to the first stationary contact in an active manner under the drive of an external force, and respectively makes conductive contact or separates from the corresponding second stationary contact, thereby realizing the conduction and disconnection of each group of contact assemblies.

[0020] Furthermore, the contact assembly includes a first group of contact assemblies and a second group of contact assemblies; at the separation position of the two groups of contact assemblies, a conductive element is provided at the end of the moving contact of the two groups of contact assemblies that is not connected to the first stationary contact, and the conductive element is insulated from the second stationary contact. Under external force, the moving contacts in the first and second contact assemblies move synchronously or individually, making conductive contact with or separating from the corresponding stationary contacts, so that the contact assembly achieves at least one of the following operating states: The first working state: when the moving contact is simultaneously in conductive contact with the corresponding second stationary contact, the first group of contact assemblies and the second group of contact assemblies are simultaneously turned on. The second working state: When the moving contacts in the first group of contact assemblies and the second group of contact assemblies are simultaneously in the separated position, the moving contacts of the first group of contact assemblies and the second group of contact assemblies respectively make conductive contact with the conductive element, so that the first stationary contacts of the first group of contact assemblies and the second group of contact assemblies are connected through the moving contacts and the connecting element.

[0021] Furthermore, it also includes a third and a fourth working state. The third working state: the moving contact of the first group of contact assemblies is in the separated position, so that the first group of contact assemblies is in a separated state; the moving contact of the second group of contact assemblies is in conductive contact with the corresponding second stationary contact, so that the second group of contact assemblies is in a conductive state. The fourth working state: the moving contact of the first group of contact assemblies is in conductive contact with the corresponding second stationary contact, so that the first group of contact assemblies is in a conductive state; the moving contact of the second group of contact assemblies is in a separated position, so that the second group of contact assemblies is in a separated state. Driven by an external force, the moving contacts in the first group of contact assemblies and the second group of contact assemblies are synchronously or individually displaced, making conductive contact or separating from the corresponding second stationary contact, so that the contact assembly is in one of four working states.

[0022] The present invention also provides a single-contact relay, including a driving mechanism and a contact assembly of the present invention, wherein the moving contact is connected to the driving mechanism through a support assembly, and the driving mechanism drives the moving contact to make conductive contact or separate from the second stationary contact.

[0023] Furthermore, the driving mechanism is an electromagnetic driving mechanism or a motor driving mechanism.

[0024] The present invention also provides a changeover switch device, including the contact system of the present invention, wherein the moving contacts of the first group of contact assemblies and the second group of contact assemblies are driven by at least one set of driving mechanisms, and the driving mechanisms are connected to the first group of contact assemblies and the second group of contact assemblies through support components; the driving mechanisms drive the moving contacts of the first group of contact assemblies and the second group of contact assemblies to move synchronously or independently, so that the moving contacts switch between different working states.

[0025] Furthermore, the driving mechanism is an electromagnetic driving mechanism or a motor driving mechanism; the support assembly is connected to the electromagnetic driving mechanism, or the support assembly abuts against the cam curve of the cam mechanism via a linearly displaced push rod.

[0026] Furthermore, a cam curve groove is provided on the side of the cam, one end of the drive shaft abuts against the cam curve groove, and the other end is connected and fixed to the push rod. The rotation of the cam drives the drive shaft to make linear displacement with the push rod.

[0027] Furthermore, when the push rod is driven to make linear displacement by the cam curve on the outer periphery of the cam, a reaction spring is sleeved on the push rod. Limiting structures are respectively provided at both ends of the reaction spring. The limiting structure at the end of the reaction spring facing the cam is provided on the push rod. When the cam drives the push rod to make conductive contact with the corresponding stationary contact, the reaction spring is compressed by the limiting structure. When the cam loses its driving force on the push rod, the elastic force of the reaction spring drives the push rod to reset the moving contact.

[0028] The contact assembly of the present invention allows for conductive connection between one end of a moving contact and a first stationary contact, while leaving only the other end of the moving contact conductively contacting and separating from a second stationary contact. This achieves the connection and disconnection between the first and second stationary contacts of the contact assembly. This solves the problem of poor contact in dual-contact relays and improves the contact reliability of the contact assembly.

[0029] When contact assemblies are used in single-contact relays, they can improve the reliability of relay contacts and avoid the risk of circuit failure due to poor contact. Furthermore, the rotating moving contact increases the response speed from the separated position to the contact position. The rotating moving contact also allows for a wider insulation distance between the moving contact and the second stationary contact during design; the increased distance is compensated for by the rotation angle, improving insulation performance in the separated state. Additionally, it can lengthen the arc from conductive contact to separation, improving arc extinguishing capability.

[0030] The contact assembly of the present invention can also be applied to the contact system of relay-type switching devices. By using two or more sets of the contact assemblies of the present invention, or by using at least one set of the contact assemblies of the present invention in conjunction with existing contact assemblies, the structural diversity of the contact system can be achieved while reducing contact resistance.

[0031] When two sets of contact assemblies are used in a changeover switch, at least two circuit states can be switched, such as switching between series and parallel connections of two circuits, or switching between independent operating states of two circuits. When the two sets of contact assemblies in the changeover switch are driven by different drive mechanisms, they can also function as two independent switching devices for switching control of different circuits.

[0032] The switching device of the present invention integrates the series-parallel switching action of at least two circuits, can replace at least three relays, and has a compact structure, small size, and small space occupation. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure in which the moving contact and the first stationary contact are connected by a conductive flexible connector.

[0034] Figure 2 yes Figure 1A schematic diagram of its external structure.

[0035] Figure 3 This is a schematic diagram of the contact structure between the first moving contact and the first stationary contact when the first moving contact and the second stationary contact are in conductive contact.

[0036] Figure 4 This is a schematic diagram of the structure in which the first moving contact and the first stationary contact abut when the first moving contact is in the separated position.

[0037] Figure 5 This is a three-dimensional structural diagram showing the first moving contact abutting against the first stationary contact when the first moving contact is in the separated position after the fixed support is removed.

[0038] Figure 6 This is a side view of the structure when the first moving contact is in the separated position after the fixed support is removed, and the first moving contact is in contact with the first stationary contact.

[0039] Figure 7 This is a schematic diagram of the structure in which the first moving contact and the first stationary contact abut.

[0040] Figure 8 This is a schematic diagram of another configuration of the elastic element when the first moving contact and the first stationary contact abut.

[0041] Figure 9 This is a three-dimensional structural diagram of another contact method between the first moving contact and the first stationary contact when the first moving contact and the second stationary contact are in conductive contact.

[0042] Figure 10 yes Figure 9 A side view structural diagram.

[0043] Figure 11 yes Figure 9 A cross-sectional structural diagram.

[0044] Figure 12 This is a three-dimensional structural diagram of another contact method between the first moving contact and the first stationary contact when the first moving contact is in the separated position.

[0045] Figure 13 yes Figure 12 A side view structural diagram.

[0046] Figure 14 yes Figure 12 A cross-sectional structural diagram.

[0047] Figure 15 This is a three-dimensional structural diagram of the present invention in a parallel state.

[0048] Figure 16 This is a side view schematic diagram of the parallel structure of the present invention.

[0049] Figure 17 This is a three-dimensional structural diagram of the present invention in a series configuration.

[0050] Figure 18 This is a side view of the structure of the present invention in series.

[0051] Figure 19 yes Figure 15 A top-view structural diagram.

[0052] Figure 20 This is a circuit diagram showing the circuit where the two sets of contact assemblies are connected in parallel.

[0053] Figure 21 This is a circuit diagram showing the circuit configuration when the two sets of contact assemblies are connected in series.

[0054] Figure 22 This is a circuit diagram showing the separation of the first set of contact components and the conduction of the second set of contact components.

[0055] Figure 23 This is a circuit diagram showing the first group of contact components being turned on and the second group of contact components being turned off.

[0056] Figure Labels First stationary contact 1, second stationary contact 2, first stationary contact 3, second stationary contact 4, first moving contact 5, second moving contact 6, drive mechanism 7, conductive component 8, support assembly 9, base 10, U-shaped bracket 11, contact spring 12, first fixing component 13, fixing support component 14, abutting mating surface 15, elastic element 16, suspended component 17, waist-shaped hole 19, second fixing component 20, flexible connector 21, first fixed shaft 22, abutting end 101, abutting end 51, receiving notch 52. Detailed Implementation

[0057] The contact assembly of the present invention includes a stationary contact assembly and a moving contact. The stationary contact assembly includes a first stationary contact and a second stationary contact that are insulated from each other. One end of the moving contact is electrically connected to one end of the first stationary contact in a movable manner, and the other end of the moving contact is disposed corresponding to the second stationary contact. Under the drive of an external force, the moving contact rotates relative to the first stationary contact and makes conductive contact or separates from the corresponding second stationary contact.

[0058] When the moving contact is driven to rotate by an external force, one end remains electrically connected to the first stationary contact, while the other end makes electrical contact with or separates from the second stationary contact depending on the degree of rotation.

[0059] The aforementioned single contact assembly can be used in relays to form single-contact relays. Two or more contact assemblies, when used in changeover switching devices, can achieve switching between at least two circuit operating states. The contact assembly of this invention can also be used in the contact system of relay-type switching devices. The contact system can include two or more contact assemblies, where at least one set of contact assemblies is the contact assembly of this invention. Other contact assemblies besides this set can be implemented in various ways, and can be any of the contact assembly schemes of this invention, including single-contact and double-contact contact assemblies. In other words, the contact system of this invention, through two or more sets of the contact assemblies of this invention, or at least one set of the contact assemblies of this invention combined with existing contact assemblies, achieves structural diversity of the contact system while reducing contact resistance. Existing contact assembly structures include, for example, two stationary contacts and a bridge-shaped moving contact. The bridge-shaped moving contact makes conductive contact with the two stationary contacts, and the bridge-shaped moving contact separates from the two stationary contacts, thus breaking the connection of the contact assembly.

[0060] The following describes preferred embodiments in detail with reference to the accompanying drawings. The directional terms used are for reference only and do not constitute a limitation on the technical solution of this invention.

[0061] The contact assembly of the present invention will be described using a single-contact relay as an example. See below. Figure 1 and Figure 2 The system includes a first set of contact assemblies, which comprises a first stationary contact assembly and a first moving contact 5. The first stationary contact assembly includes a first stationary contact 1 and a second stationary contact 2 that are insulated from each other. One end of the first moving contact 5 is electrically connected to the first stationary contact 1 via a conductive flexible connector 21. The second stationary contact 2 is located on the displacement path of the other end of the first moving contact 5. In the separated position, the first moving contact 5 and the second stationary contact 2 are insulated from each other.

[0062] The first moving contact 5 is a long strip-shaped structure, supported by a support assembly 9. The support assembly 9 is also a conventional structure for relays (or contactors), with a basic structure including a base 10, a U-shaped bracket 11, and a contact spring 12. The open end of the U-shaped bracket 11 is connected to the base 10. The first moving contact 5 passes through the space formed by the base 10 and the U-shaped bracket 11. The contact spring 12 is located between the first moving contact 5 and the base 10, with both ends of the contact spring 12 abutting against the base 10 and the first moving contact 5 respectively. The contact spring 12 is always in a compressed state. To ensure stable placement of the contact spring 12, a boss or a groove is provided at the corresponding position of the first moving contact 5 and the base 10 for positioning the end of the contact spring 12.

[0063] Because the flexible connector 21 is bendable, its length and shape can be varied. In order to improve the accuracy of the first moving contact 5 when it is displaced, it is preferable that the first moving contact 5 rotates around a fixed axis. Preferably, a first fixed shaft 22 is provided at one end of the first moving contact 5 and the flexible connector 21. The first fixed shaft 22 can be rotatably located on the fixed support members 14 on both sides of the first moving contact 5, or it can be provided on the housing of the relay, so that the first moving contact 5 rotates around the first fixed shaft 22.

[0064] The first moving contact 5 and its supporting assembly 9 are driven by the drive mechanism 7. The drive mechanism 7 is an existing drive mechanism for relays (or contactors), such as an electromagnetic drive mechanism or a motor drive mechanism, preferably an electromagnetic drive mechanism.

[0065] When the drive mechanism 7 adopts an electromagnetic drive mechanism, the support assembly 9 is connected to the moving iron core of the electromagnetic drive mechanism through a linear displacement push rod. The electromagnetic drive mechanism drives the support assembly 9 to move the first moving contact 5 linearly. The electromagnetic drive mechanism is a conventional drive mechanism for contactors and relays, and will not be described in detail here. For specific structure, please refer to the electromagnetic drive mechanisms of existing contactors and relays.

[0066] When the drive mechanism 7 adopts a motor drive mechanism, the motor drive mechanism can generally also include a cam mechanism. The support component 9 is fixedly connected to one end of the drive shaft through a linear displacement push rod, and the other end of the drive shaft is set in the cam curve groove of the cam mechanism. The motor drives the cam mechanism to rotate, providing lifting and pulling forces to the support component 9 and the first moving contact 5 through the cam curve groove. The lifting force provided by the cam mechanism drives the support component 9 to make conductive contact with the first moving contact and the second stationary contact through the first moving contact. When disconnected, the pulling force provided by the cam structure drives the support component 9 to disengage from the first moving contact and the second stationary contact through the first moving contact, and reset to the separated position. The motor is connected to the cam mechanism through a reducer. The reducer can be a worm gear mechanism or a gear transmission mechanism. The gear transmission mechanism uses two meshing gears. One gear is fixedly coaxially with the cam of the cam mechanism, and the other gear is fixedly coaxially with the worm gear. The worm gear is fixedly connected to the output shaft of the motor. The motor drives the worm gear to rotate, which drives the worm gear to rotate with the gear fixedly coaxially with it, thereby driving the other gear fixedly coaxially with the cam to rotate, and finally driving the cam to rotate. Alternatively, the cam curve on the outer periphery of the cam can be used to provide the driving force for the moving contact and stationary contact to make conductive contact between the support component 9. By setting a limiting structure on the outer periphery of the push rod and setting a reaction spring at the limiting structure, when the cam rotates and drives the moving contact and stationary contact to make conductive contact, the reaction spring is compressed; when the cam continues to rotate and the push rod gradually loses the driving force of the cam, the push rod, along with the support component and the moving contact, returns to the separated position under the elastic force of the reaction spring.

[0067] Since the drive mechanism is an existing drive mechanism for relays (or contactors), its specific structure will not be described here. For any issues not covered, please refer to the existing drive mechanism structure of existing relays (or contactors).

[0068] Figure 1 and Figure 2 The contact assembly is used in relays to form single-contact relays. Its working principle is as follows: When the drive mechanism 7 is energized, the drive support assembly 9 moves the first moving contact 5 linearly toward the second stationary contact 2. Since the first fixed shaft 22 of the first moving contact 5 is rotatable, it rotates around the first fixed shaft 22 while moving linearly. Because the first moving contact 5 is connected to the first stationary contact 1 via a flexible connector 21, the flexible connector 21 does not obstruct the rotation of the first moving contact 5. When the first moving contact 5 rotates, the first moving contact 5, which is not connected to the first stationary contact 1, lifts up and quickly approaches the second stationary contact 2, making conductive contact with it. As the drive mechanism 7 moves further, the first moving contact 5 is compressed by the second stationary contact 2, and the contact spring 12 is further compressed. The elastic force of the contact spring 12 then acts on the second stationary contact 2, pressing it firmly onto the second stationary contact 2 to ensure reliable contact until the drive mechanism 7 stops moving.

[0069] When the drive mechanism 7 is de-energized or energized in reverse, the drive mechanism 7 carries the support assembly and the first moving contact 5 away from the second stationary contact 2 until the end of the first moving contact 5 corresponding to the second stationary contact 2 is displaced to the separation position.

[0070] The movable connection between the first moving contact 5 and the first stationary contact 1 allows the first moving contact 5 to rotate during conductive contact with the second stationary contact 2, in addition to linear displacement. This rotation allows the end of the first moving contact 5 that is in contact with the second stationary contact 2 to quickly approach the second stationary contact 2, improving response speed and reducing contact resistance. Furthermore, because the first moving contact 5 can rotate, the distance between the separation position and the conductive contact position can be increased compared to traditional relay contact assemblies. The rotation of the first moving contact 5 compensates for this increased distance, increasing the insulation distance between the moving and stationary contacts. During separation, the increased displacement of the first moving contact 5 lengthens the arc distance, further aiding in arc extinguishing.

[0071] Figure 1 and Figure 2 In this configuration, the first moving contact 5 and the first stationary contact 1 are electrically connected through a flexible connector 21, or the first moving contact 5 and the first stationary contact 1 can be electrically connected by means that the first moving contact 5 and the first stationary contact 1 can be movably abutted together.

[0072] One end of the first moving contact 5 is electrically connected to the first stationary contact 1 in a movable abutment manner. The second stationary contact 2 is located on the displacement path of the other end of the first moving contact 5. The driving mechanism 7 drives the first moving contact 5 to move toward the second stationary contact 2, so that while the first moving contact 5 is moving linearly, it rotates around the abutment point as the axis, so that the other end of the first moving contact 5 that is not abutting with the first stationary contact 1 makes conductive contact with the second stationary contact 2, so that the first stationary contact 1 and the second stationary contact 2 are connected.

[0073] The end of the first stationary contact 1 that abuts against the first moving contact 5 can be an integral part of the first stationary contact 1, or the end of the first stationary contact 1 that abuts against the first moving contact 5 can be a separate independent part, which is then fixedly connected to the first stationary contact 1. The design should be based on the principle of facilitating assembly and processing.

[0074] Regardless of whether the first moving contact 5 is in a contact position conductively contacting the second stationary contact 2 or in a separated position, the first moving contact 5 and the first stationary contact 1 always remain in contact. The end of the first moving contact 5 that abuts against the first stationary contact 1 rotates along the mating surface. The mating surface of at least one of the first stationary contact 1 and the first moving contact 5 is an arc-shaped surface to ensure smooth rotation of the first moving contact 5. When the mating surface of one of the first stationary contact 1 and the first moving contact 5 is an arc-shaped surface, it is an arc-shaped convex surface; when both the mating surfaces of the first stationary contact 1 and the first moving contact 5 are arc-shaped surfaces, one is an arc-shaped convex surface and the other is an arc-shaped concave surface that mates with it. The mating surfaces can be fitted together, that is, the arc shape and curvature of the mating surfaces are consistent, or there can be a gap on one or both sides of the rotation direction of the contact position, that is, the arc shape and curvature of the mating surfaces can be inconsistent.

[0075] The size of the area in which the first moving contact 5 rotates, or the size of the angle at which the first moving contact 5 rotates, is determined by the arc length of the longest mating surface 15 that it abuts against. The mating surface 15 can be set on the first moving contact 5 or on the first stationary contact 1, and can be an arc-shaped convex surface or an arc-shaped concave surface.

[0076] The mating structure between the first moving contact 5 and the first stationary contact 1 can have various specific structures, see [reference]. Figures 3 to 7In one specific structure, the end face of the contact end 51 of the first moving contact 5 facing and abutting against the first stationary contact 1 is provided with an arc-shaped surface. First fixing members 13 are fixedly provided at corresponding positions on both sides of the first moving contact 5 near the contact end 51. The first fixing members 13 are rotatably mounted on the fixed support member 14, and can rotate relative to the fixed support member 14 under the drive of the first moving contact 5. The fixed support member 14 is fixedly mounted, and can be fixedly mounted on the housing of the relay or changeover switch, or fixedly mounted on a partition separating the contact assembly from the drive mechanism. The fixed support member 14 has a hole, such as an oblong hole 19, corresponding to the first fixing member 13, for linear displacement and rotation of the first fixing member 13. The first fixing member 13 is rotatably mounted in the oblong hole on the fixed support member 14, so that the first fixing member 13 has a displacement space for linear displacement towards the first stationary contact and a displacement space for rotation with the first moving contact.

[0077] An abutting surface 15 is provided on the side of the first stationary contact 1 facing the first moving contact 5, and the abutting surface 15 is an arc-shaped surface. The abutting end 51 of the first moving contact 5 abuts against the abutting surface 15 of the first stationary contact 1, so that the first moving contact 5 and the first stationary contact 1 form an abutting connection, and the second moving contact 5 and the first stationary contact 3 form an abutting connection.

[0078] To ensure that the abutting end 51 of the first moving contact 5 remains reliably abutted against the abutting mating surface 15 of the first stationary contact 1, at least one elastic element 16 is provided at the first moving contact 5. The elastic force of the elastic element 16 presses the abutting end 51 of the first moving contact 5 against the abutting mating surface 15 of the first stationary contact 1, thereby achieving reliable abutment. One end of the elastic element 16 can be rotatably disposed relative to the first stationary contact 1. Further, one end of the elastic element 16 can be rotatably disposed on a fixed hanging point or a hanging structure on the first stationary contact 1, such as a second fixing member 20 fixedly disposed on the first stationary contact. The other end of the elastic element 16 can be rotatably disposed relative to the first moving contact 5. Further, the other end of the elastic element 16 can be rotatably disposed on a fixed hanging point or a hanging structure on the first moving contact 5, such as a second fixing member 20 fixedly disposed on the first moving contact 5, or a suspended member 17 that engages with the first moving contact 5 in an abutting manner.

[0079] There are various ways to arrange the elastic element 16. The elastic element 16 can be arranged on one or both sides of the first moving contact 5. The elastic element 16 can be in a compressed state or a stretched state. The arrangement structure of the elastic element 16 in the compressed state and the stretched state are different. The elastic element 16 is preferably a spring.

[0080] When the elastic element 16 is in a compressed state, see Figures 3 to 7 As shown, along the direction from the end of the moving contact towards the first stationary contact, one end of the elastic element 16 abuts against the fixed support 14, and the other end abuts against the first moving contact 5 near the abutting end 51. To prevent the elastic element 16 from moving, corresponding limiting bosses or limiting grooves are provided at the corresponding positions of the fixed support 14 and the first moving contact 5 where the elastic element 16 abuts. The ends of the elastic element 16 are sleeved on the outer periphery of the boss or nested in the limiting groove, thus limiting the position of both ends of the elastic element 16 and preventing the ends of the elastic element 16 from moving. The elastic force generated by the compressed state of the elastic element 16 causes the first fixing member 13 on the first moving contact 5 to abut against the end of the oblong hole on the fixed support 14 near the first stationary contact, so that the abutting end 51 of the first moving contact 5 is always pressed against the abutting mating surface 15 of the first stationary contact 1. Since the rotation amplitude of the moving contact is relatively small, the elastic element 16 is slightly bent due to the rotation of the moving contact. The slight bending of the elastic element 16 reduces the elastic force, and the reduced elastic force will not affect the abutment and mating surface of the first moving contact that it is in contact with.

[0081] In order to reduce space and improve space utilization, a receiving notch 52 for accommodating the elastic element 16 is provided on at least one side of the first moving contact 5. Preferably, a receiving notch 52 is provided on both sides. One end of the fixed support member 14 is located at the receiving notch 52, the elastic element 16 is located in the receiving notch, and both ends abut against the fixed support member 14 and the corresponding moving contact, respectively.

[0082] When the elastic element 16 is in a stretched state See Figure 8Second fixing members 20 are fixedly provided on opposite sides of the end where the first stationary contact 1 and the first moving contact 5 abut against each other. The two ends of the elastic element 16 are respectively rotatably sleeved on the second fixing members 20 of the first stationary contact 1 and the first moving contact 5. The elastic force generated by the stretching of the elastic element 16 causes the abutting end 51 of the first moving contact 5 to abut against the abutting mating surface 15 of the first stationary contact 1. The advantage of setting the elastic element 16 in a stretched state compared to a compressed state is that one end of the elastic element 16 rotates around the second fixing member 20 as the first moving contact 5 rotates, and the other end of the elastic element 16 also rotates around the second fixing member 20 on the first stationary contact as the moving contact rotates. This ensures that the elastic force generated by the elastic element 16 is always in the same direction as the force applied between the abutting end 51 of the first moving contact 5 and the abutting mating surface 15 of the first stationary contact 1. At this time, the elastic force that maximizes the contact between the abutting end 51 of the first moving contact 5 and the abutting mating surface 15 of the first stationary contact 1 is maximized. The disadvantage is that it occupies relatively more space.

[0083] The aforementioned method of using abutment surface 15 on the first stationary contact 1 can also involve placing the abutment surface 15 on the first moving contact 5. (See attached image) Figures 9 to 14 The first moving contact 5 has one end directly below the corresponding first stationary contact 1 and second stationary contact 3. A mating surface 15, which is arc-shaped, is provided on the upper surface of the first moving contact 5 facing the first stationary contact 1. The ends of the first stationary contact 1 and second stationary contact 3 facing the first moving contact 5 have protruding mating ends 101, which are also arc-shaped. A rotating mating surface is provided on the lower surface of the end of the first moving contact 5 with the mating surface 15. Second fixing members 20 are respectively provided on both sides of the abutment end 101 of the first stationary contact 1. Suspended members 17 are respectively suspended at the rotational mating surface of the first moving contact 5. The suspended members 17 are in surface contact with the rotational mating surface, and their two ends are located on opposite outer sides of the first moving contact 5. The two ends of the suspended members 17 at the first moving contact 5 are connected to the second fixing members 20 on both sides of the abutment end of the corresponding first stationary contact 1 via elastic elements 16. The elastic elements 16 are in a stretched state. The elastic force generated by the stretching of the elastic elements 16 causes the suspended members 17 to be tightly fitted against the rotational mating surface of the first moving contact 5, while the abutment end 101 of the first stationary contact 1 abuts against the abutment mating surface 15 of the first moving contact 5. The elastic elements 16 are rotatably connected to the second fixing members 20 at both ends of the first stationary contact 1.

[0084] When the first moving contact 5 rotates around its axis at the contact point, the suspended part 17 changes its position as the first moving contact 5 rotates under the elastic force of the elastic element 16. However, the suspended part 17 is always set to fit against the rotating mating surface. Correspondingly, the position of the elastic element 16 changes with the suspended part 17, so that the elastic force generated by the elastic element 16 is always in the same direction as the force applied by the contact mating surface 15 and the contact end 101 of the first stationary contact 1. The contact mating surface 15 of the first moving contact 5 and the contact end 101 of the first stationary contact 1 have the greatest tension. Therefore, the contact mating surface of the first moving contact 5 and the contact end of the first stationary contact 1 can be made to fit together to the maximum extent.

[0085] The first moving contact 5 and the first stationary contact 1 are rotatably abutted. When the driving mechanism 7 drives the first moving contact 5 to move linearly toward the second stationary contact 2, the abutting end of the first moving contact 5 and the corresponding first stationary contact 1 also rotates in the driving within the abutting surface in abutting manner. The other end of the first moving contact 5 that is not abutting with the first stationary contact 1 rotates toward the second stationary contact 2 until it makes conductive contact with the second stationary contact 2.

[0086] The movable contact methods of the first moving contact 5 and the first stationary contact 1 shown in the above figure are only a few specific structures and do not constitute a limitation on the movable contact methods. As long as the contact method of the first moving contact 5 and the first stationary contact 1 remains in contact during the displacement process of the first moving contact 5 and the second stationary contact 2 during the separation state of disengagement from contact, it is acceptable.

[0087] The above Figures 1 to 14 When a contact assembly in which the first moving contact and the first stationary contact are movably connected is used in a relay, the relay has only one contact position, that is, it forms a single-contact relay, which improves the contact reliability of the relay, shortens the displacement time during contact, and shortens the response time. In addition, it can lengthen the insulation distance between the moving contact and the second stationary contact it contacts, thereby improving the arc extinguishing capability.

[0088] The aforementioned contact assembly can be used in changeover switching devices. When used in changeover switching devices, two sets of contact assemblies are required. See [link / reference]. Figures 15 to 19 The system includes a first set of contact assemblies and a second set of contact assemblies. The first set of contact assemblies includes a first stationary contact 1, a second stationary contact 2, and a first moving contact 5. The second set of contact assemblies includes a first stationary contact 3, a second stationary contact 4, and a second moving contact 6. The first stationary contacts (1, 3) of the two sets of contact assemblies are located on the same side, and the second stationary contacts (2, 4) are located on the same side. The first stationary contacts (1, 3) and the second stationary contacts (2, 4) are located on opposite sides.

[0089] The first moving contact 5 and the second moving contact 6 can be supported by support components 9 respectively. Alternatively, the first moving contact 5 and the second moving contact 6 can be simultaneously disposed in the space between the same base 10 and the U-shaped bracket 11, and supported by corresponding contact springs 12 respectively. When disposed in the same space between the base 10 and the U-shaped bracket 11, a guide isolator is provided between the first moving contact 5 and the second moving contact 6 to isolate them, allowing them to move independently within the space of the base and the U-shaped bracket without interference. Preferably, the first moving contact 5 and the second moving contact 6 are supported by independent support components 9.

[0090] Both sets of contact assemblies can be driven by a single drive mechanism 7, or they can be driven separately by a single drive mechanism 7. When driven by a single drive mechanism 7, the support assemblies 9 supporting the first moving contact 5 and the second moving contact 6 are both connected to the drive mechanism 7 via push rods. Whether to use one or two drive mechanisms 7 depends on the design requirements.

[0091] A conductive element 8 is provided at the separated position of the other end of the first moving contact 5 and the second moving contact 6 of the two sets of contact assemblies that is not connected to the first stationary contact (1, 3). When the first moving contact 5 and the second moving contact 6 are both in the separated position, the other end of the first moving contact 5 and the second moving contact 6 that is not connected to the first stationary contact (1, 3) are in conductive contact with the conductive element 8, so that the first stationary contact 1 and the first stationary contact 3 of the two sets of contact assemblies are connected in series through the first moving contact 5, the second moving contact 6 and the conductive element 8.

[0092] To improve the reliability of the contact, preferably, an elastic support, such as a spring, is provided below the conductive element 8. The conductive element 8 is fixedly mounted on the elastic support. When the conductive element 8 is not in contact with the moving contact, the elastic support is in a natural extension and contraction state. At this time, the position of the conductive element is slightly higher than the separation position. Before the first moving contact 5 and the second moving contact 6 move to the separation position, they first make conductive contact with the conductive element 8. They continue to move until they stop moving at the separation position. At this time, the elastic support is squeezed by the moving contact, generating an upward elastic force. The upward elastic force of the elastic support ensures that the conductive element makes reliable contact with the first moving contact 5 and the second moving contact 6.

[0093] In the aforementioned changeover switch device, the first stationary contact (1, 3) and the second stationary contact (2, 4) serve as the four terminals of the changeover switch device and can be connected to an external circuit. The stationary contact assemblies of each group of contact assemblies are connected in series in the same external circuit. That is, the first stationary contact 1 and the second stationary contact 2 in the first group of stationary contact assemblies are connected in series in at least one external circuit, denoted by B1. The first stationary contact 3 and the second stationary contact 4 in the second group of stationary contact assemblies are connected in series in another external circuit, denoted by B2. The first group of stationary contact assemblies and the second group of stationary contact assemblies are connected in series in different external circuits; for specific connection methods, please refer to [reference needed]. Figure 20 and Figure 21 The circuit schematic shows that in the first set of stationary contact assemblies, the first stationary contact 1 is connected to the negative power supply B1- in circuit B1, the second stationary contact 2 is connected to the negative power supply B2- in circuit B2, the first stationary contact 3 in the second set of stationary contact assemblies is connected to the positive power supply B2+ in circuit B2, and the second stationary contact 4 is connected to the positive power supply B1+ in circuit B1.

[0094] When driven by a set of driving mechanisms, the switching between two circuit states can be achieved, namely the switching between parallel state and series state. The parallel state is defined as the first working state, and the series state is defined as the second working state.

[0095] See Figure 15 , Figure 16 and Figure 20 When the drive mechanism 7 is energized, the first moving contact 5 and the second moving contact 6 of the two sets of contact assemblies move synchronously to make conductive contact with the corresponding second stationary contacts (2, 4). At this time, the circuits B1 and B2 where the two sets of contacts are located are connected in parallel. The working state at this time is the first working state.

[0096] See Figure 17 , Figure 18 And see Figure 21 When the drive mechanism 7 is de-energized or reverse-energized, the first moving contact 5 and the second moving contact 6 of the two sets of contact assemblies are disengaged from the conductive contact of the second stationary contact (2, 4). When the first moving contact 5 and the second moving contact 6 are in the separated position, the first moving contact 5 and the second moving contact 6 are in conductive contact with the conductive element 8 respectively, so that when the first stationary contact (1, 3) of the two sets of contact assemblies are connected in series, the circuits B1 and B2 where the two sets of contacts are located are connected in series. At this time, the working state is the second working state.

[0097] When two sets of drive mechanisms are used, that is, when one set of drive mechanisms drives the moving contact of one set of contact assemblies, four circuit states can be switched.

[0098] The two sets of drive mechanisms operate synchronously, making the moving contacts of the two sets of contact assemblies make conductive contact with the second stationary contact in the corresponding set, thus realizing the conduction of the circuits in which the two sets of contact assemblies are located, and at the same time connecting the circuits in which the two sets of contact assemblies are located in parallel. This is the first working state.

[0099] The two sets of drive mechanisms operate synchronously, simultaneously de-energizing or reversing the energizing. The moving contacts of the two sets of contact assemblies separate from the second stationary contacts in the corresponding sets. The moving contacts of both sets of contact assemblies are in the separated position and make conductive contact with the conductive element 8, so that the first stationary contacts 1 of the two sets of contact assemblies are connected in series. That is, the negative power supply of the B1 circuit where the two sets of contact assemblies are located is connected in series with the positive power supply of the B2 circuit, realizing the series connection between the circuits (B1, B2) where the two sets of contact assemblies are located. This is the second working state.

[0100] The two sets of contact assemblies achieve opposite actions through the asynchronous, i.e., opposite, movements of two sets of drive mechanisms. For example, when the first moving contact of the first set of contact assemblies is in the separated position, the second moving contact of the second set of contact assemblies is in conductive contact with the corresponding second stationary contact, and the second moving contact is in the conducting position. (See [link]). Figure 22 That is, the B1 circuit where the first group of contact components is located is disconnected and does not work, while the B2 circuit where the second group of contact components is located is connected and works, which is the third working state.

[0101] Conversely, when the first set of contact assemblies is in the ON position, the second set of contact assemblies is disengaged and not conducting. See [link / reference] Figure 23 That is, the B1 circuit where the first group of contact components is located is turned on, and the B2 circuit where the second group of contact components is located is turned off, which is the fourth working state.

[0102] In the first and second working states, both sets of contact assemblies are in operation in the external circuits. In the third and fourth working states, only one set of contact assemblies is in operation in the external circuits.

[0103] Whether switching between two circuit states or four circuit states is required depends on the actual needs.

[0104] The switching device of this invention is applied to the two 400V voltage platform circuits of an electric vehicle. With a single switching device, switching between parallel and series connections of the two 400V voltage platforms can be achieved. Alternatively, under certain specific conditions, only one 400V voltage platform can operate, allowing the two 400V voltage platforms of the electric vehicle to have more operating states and meet more application scenarios. When the switching device of this invention is applied to the two 400V voltage platform circuits of an electric vehicle, it solves the problems of large size, large space requirements, and complex control caused by the existing method of using three relays to switch between two 400V voltage platforms. Using the switching device of this invention has the advantages of small size, small space occupation, and simple control.

[0105] The switching device of the present invention can also be used in the same external circuit, wherein the first set of contacts and the second set of contacts are connected in series with at least one of a power supply and a load, respectively, and then connected in parallel in at least one identical external circuit, forming a parallel module in the external circuit connected in the following parallel connection manner: two parallel power supply modules; two parallel connection branches; one power supply module connected in parallel with one connection branch; when the moving contact is displaced along at least two displacement directions, at least two or more circuit states are switched in at least three circuit operating states between the two power supply modules containing the first set of contacts and the second set of contacts, between the two connection branches, or between one power supply module and one connection branch.

Claims

1. A contact assembly, characterized in that, The device includes a stationary contact assembly and a moving contact. The stationary contact assembly includes a first stationary contact and a second stationary contact that are insulated from each other. One end of the moving contact is electrically connected to one end of the first stationary contact in a movable manner, and the other end of the moving contact is disposed corresponding to the second stationary contact. Under the drive of an external force, the moving contact rotates relative to the first stationary contact and makes conductive contact or separates from the corresponding second stationary contact.

2. The contact assembly according to claim 1, characterized in that, The moving contact and the first stationary contact are rotatably abutted.

3. The contact assembly according to claim 2, characterized in that, The contact point between the moving contact and at least one of the first stationary contacts is configured as an arc-shaped surface, so that the moving contact and the first stationary contact can rotatably contact each other.

4. The contact assembly according to claim 3, characterized in that, The contact points between the moving contact and the first stationary contact are both designed as arc-shaped surfaces, allowing the moving contact and the first stationary contact to rotatably contact each other through the arc-shaped mating surfaces.

5. The contact assembly according to claim 3, characterized in that, An elastic element is provided at the contact point between the first stationary contact and the moving contact, and the elastic element causes the moving contact to press against the first stationary contact.

6. The contact assembly according to claim 5, characterized in that, The elastic element is in a compressed or stretched state, and the elastic element rotates as the moving contact rotates.

7. The contact assembly according to claim 6, characterized in that, When the elastic element is in a stretched state, one end of the elastic element is rotatably disposed on the first stationary contact, and the other end is rotatably disposed at the end of the moving contact that abuts against the first stationary contact.

8. The contact assembly according to claim 7, characterized in that, When the elastic element is in a stretched state, the direction of the elastic force of the elastic element is always consistent with the direction of the force acting on the first stationary contact when the moving contact comes into contact with it.

9. The contact assembly according to claim 8, characterized in that, A fixed hanging point or a hanging structure is respectively provided on the end of the first stationary contact and the moving contact that abuts against each other. One end of the elastic element is rotatably provided on the fixed hanging point or the hanging structure on the first stationary contact, and the other end of the elastic element is rotatably provided on the fixed hanging point or the hanging structure on the moving contact.

10. The contact assembly according to claim 9, characterized in that, A rotating mating surface is provided on the lower surface of the abutting end of the moving contact away from the abutting point of the first stationary contact. A suspended member is provided at the rotating mating surface for rotatable engagement as the hanging structure. A second fixing member is provided on both sides of the first stationary contact above the end of the first stationary contact that abuts with the moving contact as the fixing hanging point. The two ends of the suspended member are rotatably connected to the second fixing member through the elastic element.

11. The contact assembly according to claim 6, characterized in that, When the elastic element is in a compressed state, one end of the elastic element facing the first stationary contact abuts against the abutting end of the moving contact, while the other end away from the first stationary contact is fixedly disposed and does not contact the moving contact.

12. The contact assembly according to claim 11, characterized in that, A receiving notch is provided on at least one side of the abutting end of the moving contact, and the elastic element is disposed in the receiving notch, with one end abutting the moving contact and the other end fixed away from the first stationary contact.

13. The contact assembly according to claim 12, characterized in that, Fixed support members are respectively provided on opposite sides of the moving contact. The fixed support members are provided with waist-shaped holes. First fixing members are provided on both sides of the end of the moving contact that abuts against the first stationary contact. The two ends of the first fixing members are disposed in the waist-shaped holes. The waist-shaped holes have space for the first fixing members to move linearly toward the first stationary contact and space to rotate with the moving contact. One end of the elastic element abuts against the moving contact, and the other end abuts against the fixed support members.

14. A contact system, characterized in that, It includes at least two sets of contact assemblies, each set of contact assemblies including a stationary contact and a moving contact, wherein at least one set is the contact assembly according to any one of claims 1 to 14; the contact system is made conductive or disconnected through the conductive contact and separation between the moving contact and the stationary contact.

15. The contact system according to claim 14, characterized in that, The moving contact of each group of contact assemblies rotates relative to the first stationary contact in an active manner under the drive of an external force, and makes conductive contact or separates from the corresponding second stationary contact, thereby realizing the conduction and disconnection of each group of contact assemblies.

16. The contact system according to claim 15, characterized in that, The contact assembly includes a first group of contact assemblies and a second group of contact assemblies; at the separation position of the two groups of contact assemblies, a conductive element is provided at the end of the moving contact of the two groups of contact assemblies that is not connected to the first stationary contact, and the conductive element is insulated from the second stationary contact. Under external force, the moving contacts in the first and second contact assemblies move synchronously or individually, making conductive contact with or separating from the corresponding stationary contacts, so that the contact assembly achieves at least one of the following operating states: The first working state: when the moving contact is simultaneously in conductive contact with the corresponding second stationary contact, the first group of contact assemblies and the second group of contact assemblies are simultaneously turned on. The second working state: When the moving contacts in the first group of contact assemblies and the second group of contact assemblies are simultaneously in the separated position, the moving contacts of the first group of contact assemblies and the second group of contact assemblies respectively make conductive contact with the conductive element, so that the first stationary contacts of the first group of contact assemblies and the second group of contact assemblies are connected through the moving contacts and the connecting element.

17. The contact system according to claim 16, characterized in that, It also includes a third and a fourth working state. The third working state: the moving contact of the first group of contact assemblies is in the separated position, so that the first group of contact assemblies is in a separated state; the moving contact of the second group of contact assemblies is in conductive contact with the corresponding second stationary contact, so that the second group of contact assemblies is in a conductive state. The fourth working state: the moving contact of the first group of contact assemblies is in conductive contact with the corresponding second stationary contact, so that the first group of contact assemblies is in a conductive state; the moving contact of the second group of contact assemblies is in a separated position, so that the second group of contact assemblies is in a separated state. Driven by an external force, the moving contacts in the first group of contact assemblies and the second group of contact assemblies are synchronously or individually displaced, making conductive contact or separating from the corresponding second stationary contact, so that the contact assembly is in one of four working states.

18. A single-contact relay, characterized in that, The device includes a drive mechanism and a contact assembly as described in any one of claims 1 to 13, wherein the moving contact is connected to the drive mechanism via a support assembly, and the drive mechanism drives the moving contact to make conductive contact or separate from the second stationary contact.

19. The single-contact relay according to claim 18, characterized in that, The driving mechanism is an electromagnetic driving mechanism or a motor driving mechanism.

20. A changeover switch device, characterized in that, The contact system includes any one of claims 14 to 17, wherein the moving contacts of the first group of contact assemblies and the second group of contact assemblies are driven by at least one set of driving mechanisms, and the driving mechanisms are connected to the first group of contact assemblies and the second group of contact assemblies through support components; the driving mechanisms drive the moving contacts of the first group of contact assemblies and the second group of contact assemblies to move synchronously or independently, so that the moving contacts switch between different working states.

21. The changeover switch device according to claim 20, characterized in that, The driving mechanism is an electromagnetic driving mechanism or a motor driving mechanism; the support component is connected to the electromagnetic driving mechanism, or the support component abuts against the cam curve of the cam mechanism through a linearly displaced push rod.

22. The changeover switch device according to claim 21, characterized in that, A cam curve groove is provided on the side of the cam. One end of the drive shaft abuts against the cam curve groove, and the other end is connected and fixed to the push rod. The rotation of the cam drives the drive shaft to move the push rod in a linear displacement.

23. The changeover switch device according to claim 22, characterized in that, When the push rod is driven to make linear displacement by the cam curve on the outer peripheral surface of the cam, a reaction spring is sleeved on the push rod. The two ends of the reaction spring are respectively provided with limit structures. The limit structure at the end of the reaction spring facing the cam is provided on the push rod. When the cam drives the push rod to make conductive contact with the corresponding stationary contact, the reaction spring is compressed by the limit structure. When the cam loses its driving force on the push rod, the elastic force of the reaction spring drives the push rod to reset the moving contact.

Images