Bridge switch and relay

Abstract

The utility model provides a bridge-type switch and a relay. The bridge-type switch comprises two static contacts and a bridge-type moving contact. Each static contact is provided with a first static contact and a second static contact at an interval; the bridge type movable contact comprises a rigid overcurrent bridge and a flexible overcurrent bridge, the rigid overcurrent bridge is provided with a first movable contact corresponding to the first static contacts of the two static contacts, and when the bridge type movable contact is disconnected from the two static contacts, the distance between the second movable contact and the second static contact is smaller than the distance between the first movable contact and the first static contact; the flexible over-current bridge is provided with an elastic deformation part, and is provided with a second movable contact corresponding to the second static contacts of the two static contact members, and the second movable contact is arranged at the elastic deformation part. The relay comprises the bridge switch. When the contact is applied, the contact resistance is small, the temperature rise is low, the contact loss is small, and the contact service life is longer.

Description

Technical Field

[0001] This utility model relates to the field of relays, specifically to a bridge switch and a relay. Background Technology

[0002] A relay comprises a fixed part and a moving part. The fixed part includes a stationary contact with a stationary point. The moving part includes an armature and a moving contact assembly fixedly connected to the armature. The moving contact assembly has a moving contact corresponding to the stationary contact. When the coil is not energized, the moving part remains in the position where the moving contact is open from the stationary contact. When the coil is energized, the armature is attracted by the iron core, causing the moving contact assembly to move and close the moving contact with the stationary contact. When this type of relay is used in a high-current environment, it suffers from high contact resistance and high temperature rise, thus affecting the contact life. Utility Model Content

[0003] The purpose of this invention is to overcome the aforementioned defects or problems in the prior art and to provide a bridge switch and relay with low contact resistance, low temperature rise, and longer contact life.

[0004] To achieve the above objectives, the present invention and its preferred embodiments adopt the following technical solutions, but the embodiments are not limited to the following solutions:

[0005] Technical solution one and its preferred embodiment provide a bridge switch, which includes two stationary contacts and a bridge-type moving contact; each stationary contact is provided with a first stationary contact and a second stationary contact at intervals; the bridge-type moving contact includes a rigid current-carrying bridge and a flexible current-carrying bridge, the rigid current-carrying bridge is provided with a first moving contact corresponding to the first stationary contact of the two stationary contacts; when the bridge-type moving contact is disconnected from the two stationary contacts, the distance between the second moving contact and the second stationary contact is less than the distance between the first moving contact and the first stationary contact; the flexible current-carrying bridge is provided with an elastic deformation part, and is provided with a second moving contact corresponding to the second stationary contact of the two stationary contacts, the second moving contact being disposed in the elastic deformation part.

[0006] Based on technical solution one, technical solution two is also provided. In technical solution two and its preferred embodiments, the cross-sectional area of ​​the rigid flow bridge is greater than that of the flexible flow bridge, and / or the conductivity of the rigid flow bridge is greater than that of the flexible flow bridge.

[0007] Based on technical solution one, there is also technical solution three. In technical solution three and its preferred embodiments, the number of elastic deformation parts corresponds to the number of second moving contacts; each elastic deformation part is provided with a first connecting end and a second connecting end, the second connecting end is fixedly connected to the second moving contact, and a nonlinear elastic deformation path is provided between the second connecting end and the first connecting end.

[0008] Based on technical solution three, there is also technical solution four. In technical solution four and its preferred embodiments, the elastic deformation part forms a nonlinear elastic deformation path through at least two bends.

[0009] Based on any one of technical solutions one to four, there is also a technical solution five. In technical solution five and its preferred embodiments, the elastic deformation part is provided with a bending section, the bending section is provided on the deformation transmission path of the elastic deformation part, and the bending section is adapted to unfold when the bridge-type moving contact and the stationary contact are closed.

[0010] Based on technical solution four, there is also technical solution six. In technical solution six and its preferred embodiments, the elastic deformation part is provided with a first arm, a second arm and a third arm connected in sequence, the extension direction of the second arm intersects with the extension directions of the first arm and the third arm; the second connecting end is provided on the first arm and the first connecting end is provided on the third arm.

[0011] Based on technical solution six, there is also technical solution seven. In technical solution seven and its preferred embodiments, the first arm and / or the second arm are provided with a bending section. The bending section is formed by two consecutive reverse bends to make a part of the first arm and / or the second arm extend in a Z-shape. The bending section is suitable for unfolding when the bridge-type moving contact and the stationary contact are closed.

[0012] Based on technical solutions six or seven, technical solution eight is also provided. In technical solution eight and its preferred embodiments, each first stationary contact is arranged at intervals along the first direction, and each second stationary contact is located on both sides of each first stationary contact along the first direction; the first arm and the rigid overflow bridge are arranged at intervals along the first direction; the extension direction of the first arm intersects with the first direction.

[0013] Based on technical solution eight, there is also technical solution nine. In technical solution nine and its preferred embodiments, the number of elastic deformation parts is two. The flexible flow bridge is also provided with a bridging part, which is integrated with the third arm of the two elastic deformation parts. The bridging part is fixedly connected to the rigid flow bridge through the first moving contact.

[0014] Based on technical solution nine, there is also technical solution ten. In technical solution ten and its preferred embodiments, the first moving contact and the second moving contact are respectively adapted to close or open with the first stationary contact and the second stationary contact along the second direction; the first arm and the third arm both extend along the third direction; the second arm extends along the first direction; the first direction, the second direction and the third direction are orthogonal.

[0015] Based on technical solution ten, technical solution eleven is also provided. In technical solution eleven and its preferred embodiment, the bridging part extends along the first direction, and the third arms of the two elastic deformation parts are respectively connected to the two ends of the bridging part on the same side along the third direction. The end of the first arm away from the second arm is provided with a widening section, and the widening section is fixedly connected to the second moving contact.

[0016] Based on technical solution ten, there is also technical solution twelve. In technical solution twelve and its preferred embodiments, the third arms of the two elastic deformation parts are connected as one unit, and the second arms of the two elastic deformation parts are connected as one unit.

[0017] Based on technical solution 12, there is also technical solution 13. In technical solution 13 and its preferred embodiment, the bridging part extends along the first direction, and the third arms of the two elastic deformation parts are integrated with the middle part of the bridging part along the first direction. The two ends of the bridging part along the first direction are respectively provided with protrusions protruding toward the second arm, and the protrusions are fixedly connected to the first moving contact.

[0018] Technical solution fourteen and its related embodiments provide a relay, including a moving reed and a bridge switch as described in any one of technical solutions one to eleven, wherein the moving reed is fixedly connected to both the rigid overcurrent bridge and the flexible overcurrent bridge of the bridge moving contact.

[0019] Based on technical solution fourteen, there is also technical solution fifteen. In technical solution fifteen and its preferred embodiments, an armature is also included. The armature is connected to a moving spring and is adapted to drive the bridge-type moving contact to swing. The bridge-type moving contact and the armature are spaced apart along a direction perpendicular to the contact closing direction and the arrangement direction of each stationary contact.

[0020] Based on technical solution fourteen, there is also technical solution sixteen. In technical solution sixteen and its preferred embodiments, the flexible flow bridge is further provided with a bridging part, and the bridging part and the rigid flow bridge are fixed to the moving spring through the first moving contact.

[0021] Technical solution seventeen and its preferred embodiment provide a relay, including a moving reed and a bridge switch as described in any one of technical solutions twelve to thirteen, wherein the moving reed is fixedly connected to both the rigid current bridge and the flexible current bridge of the bridge moving contact.

[0022] Based on technical solution seventeen, there is also technical solution eighteen. In technical solution eighteen and its preferred embodiments, the armature is connected to the moving spring and is adapted to drive the bridge-type moving contact to swing; the rigid flow bridge and the armature are spaced apart along a third direction, and the second arm and the armature at least partially overlap along a third direction on the projection plane perpendicular to the second direction.

[0023] Based on technical solution eighteen, there is also technical solution nineteen. In technical solution nineteen and its preferred embodiment, the armature is provided with a protrusion fixed to the moving spring, and the second arm is also provided with a clearance hole that avoids the protrusion.

[0024] Based on technical solution seventeen, there is also technical solution twenty. In technical solution twenty and its preferred embodiments, the flexible flow bridge is further provided with a bridging part, and the bridging part and the rigid flow bridge are fixed to the moving spring through the first moving contact.

[0025] As can be seen from the above description of the present invention and its preferred embodiments, compared with the prior art, the technical solution of the present invention and its preferred embodiments have the following beneficial effects due to the adoption of the following technical means:

[0026] In technical solution one and its related embodiments, the flexible overpass has conductivity and elasticity, including both integrated structure and split structure. If a split structure is adopted, it is necessary to ensure that the split connection does not affect the free deformation of the elastic deformation part and that the conductive path remains continuous.

[0027] When the bridge-type moving and stationary contacts are closed, the first and second moving contacts are connected in parallel, while the first moving contacts are connected in series. This results in low contact resistance, low heat generation, reduced temperature rise, reduced contact loss, and extended contact life.

[0028] In this technical solution, in the open state, the distance between the second moving contact and the second stationary contact is smaller than the distance between the first moving contact and the first stationary contact. Therefore, when the bridge-type moving contact and the stationary contact are closed, the second moving contact of the flexible current-conducting bridge contacts and conducts current first. When the bridge-type moving contact and the stationary contact are open, the second moving contact of the flexible current-conducting bridge opens later. An electric arc will be generated between the second moving contact and the second stationary contact during the break. However, because the first stationary contact and the second stationary contact are spaced apart, the electric arc during the break is less likely to damage the first moving contact and the first stationary contact. The stationary contact has an effect, thus ensuring the cleanliness of the surface of the first stationary contact and reducing the contact resistance between the first stationary contact and the first moving contact. Because the elastic deformation part deforms during contact or disconnection, it easily drives the second moving contact relative to the second stationary contact, rubbing away oxides or carbides generated after arc erosion on the surface of the second stationary contact. This results in excellent cleaning of the contact surface. Therefore, placing the second moving contact on the elastic deformation part enhances the cleaning effect on the surface of the second stationary contact and reduces the contact resistance between the second moving contact and the second stationary contact. Consequently, each moving contact and its corresponding stationary contact have lower contact resistance due to the higher cleanliness of the corresponding stationary contact surface. This design also allows the rigid overcurrent bridge to carry the main current. Since the resistance of the rigid overcurrent bridge is generally less than that of the flexible overcurrent bridge, the heat generation and temperature rise of the entire bridge moving contact are low. This avoids the problem of excessive heat affecting the deformation of the elastic deformation part when the bridge moving contact is too hot, which would lead to excessively high contact resistance of the second moving contact and the second stationary contact. In other words, it reduces the contact resistance of the second moving contact and the second stationary contact. At the same time, the first moving contact and the first stationary contact have stable contact and low contact resistance due to the rigid overcurrent bridge, thus extending the life of each contact.

[0029] Furthermore, if the second moving contact is placed on a non-elastic structure, the processing precision requirements for the flexible current bridge are high; otherwise, it is very likely that some moving contacts will be connected while others will not, failing to guarantee the effect of parallel connection and reduced contact resistance. In this technical solution, the second moving contact is placed on the elastic deformation part. The second moving contact of the flexible current bridge contacts and conducts current first. The elastic deformation part generates deformation perpendicular to the contact surface, providing contact pressure and reducing the contact resistance between the second moving contact and the second stationary contact. It also allows the second moving contact to move relative to the second stationary contact and rub away oxides or carbides generated after arc erosion on the surface of the second stationary contact. The cleaning effect on the contact surface is excellent, which is more conducive to reducing the processing precision requirements of the flexible current bridge while ensuring the connection between the second moving contact and the second stationary contact. This ensures the current shunting of the second moving contact and the reduction of contact resistance.

[0030] In technical solution two and its preferred embodiments, when the cross-sectional area of ​​the rigid current bridge is larger than that of the flexible current bridge, the current carrying capacity of the rigid current bridge can be improved, the current density reduced, the resistance of the rigid current bridge decreased, the heat generation of the entire bridge moving contact reduced, and the contact resistance between the second moving contact and the second stationary contact reduced. In addition, the flexible current bridge has a smaller cross-sectional area and can have better elasticity, thereby enabling the second moving contact to have a better cleaning effect during the opening or closing process with the second stationary contact. When the conductivity of the rigid current bridge is greater than that of the flexible current bridge, the rigid current bridge can use a material with higher conductivity than the flexible current bridge. This is because in the prior art, in order to ensure the flexibility of the conductive material, other elements are usually added to the conductive material. However, after doping, the conductivity of the conductive material will decrease, the current carrying capacity will decrease, and problems such as temperature increase will be brought about. The rigid current bridge can have a higher current carrying capacity without doping. Therefore, rigid overcurrent bridges have higher current carrying capacity and lower resistance compared to flexible overcurrent bridges, which is more conducive to reducing the heat generation of the entire bridge moving contact, thereby reducing the contact resistance of the second moving contact and the second stationary contact.

[0031] In technical solution three and its preferred embodiments, the number of elastic deformation parts corresponds to the number of second moving contacts, which can avoid uneven pressure caused by a single elastic deformation part driving multiple second moving contacts and reduce the overall contact resistance. The nonlinear elastic deformation path means that the physical path of the elastic deformation part is a non-linear shape, such as a wave shape, a spiral shape or a multi-segment curved structure. Compared with a straight path, the nonlinear elastic deformation path can increase the effective deformation length, improve the elastic deformation capability, make the displacement of the second moving contact larger and have multi-directional deformation, make the rubbing range between the second moving contact and the second stationary contact larger, and make the contact surface cleaning effect better, which is more conducive to reducing the contact resistance between the second moving contact and the second stationary contact.

[0032] In technical solution four and its preferred embodiments, the number and angle of bending can adjust the stiffness and deformation of the elastic deformation part, optimize the displacement trajectory of the second moving contact, and enhance the contact cleaning effect.

[0033] In technical solution five and its preferred embodiment, the bending section expands and releases elastic potential energy when closed, which can provide additional contact pressure to the second moving contact and reduce the contact resistance between the second moving contact and the second stationary contact. In addition, the bending section will also drive the second moving contact to move during the expansion process, which further enhances the friction cleaning effect between the second moving contact and the second stationary contact.

[0034] In technical solution six and its preferred embodiments, the difference in the extension directions of the first, second, and third arms causes the elastic deformation portion to form two bends, and causes the elastic deformation portion to undergo composite deformation under force, enhancing the displacement flexibility of the second moving contact. Furthermore, the structure of the first, second, and third arms forms a continuous arm structure, which is more conducive to dispersing deformation stress. This structure also allows the second moving contact to displace in at least two directions, namely the extension directions of the first and second arms, which is more conducive to the large-scale rubbing of the second moving contact against the second stationary contact, enhancing the cleaning effect between the contacts.

[0035] In technical solution seven and its preferred embodiments, the first arm and / or the second arm are provided with a bending section. When the bending section unfolds during closure, it releases elastic potential energy, providing additional contact pressure to the second moving contact and reducing the contact resistance between the second moving contact and the second stationary contact. Furthermore, the unfolding of the bending section also causes displacement of the second moving contact, further enhancing the frictional cleaning effect between the second moving contact and the second stationary contact. Specifically, the Z-shaped structure of the first arm and / or the second arm releases even greater elastic potential energy during unfolding, further providing stable contact pressure to the second moving contact and reducing the contact resistance between the second moving contact and the second stationary contact. When the bending section is located in the first arm, it lies on the deformation transmission path of the first arm. When the bridge-type moving and stationary contacts are closed, the unfolding of the bending section directly applies contact pressure to the second moving contact, resulting in greater contact pressure, more stable contact between the second moving contact and the second stationary contact, and lower contact resistance. When the bent section is located in the second arm, the second arm connects the first arm and the third arm. When the bent section of the second arm is unfolded, it is easy to drive the second moving contact to move along the extension direction of the second arm. This is more conducive to the second moving contact moving in at least two directions, namely the extension direction of the first arm and the extension direction of the second arm. It is also more conducive to the second moving contact rubbing the second stationary contact over a wide range, thus enhancing the cleaning effect between the contacts.

[0036] In technical solution eight and its preferred embodiments, each first stationary contact is arranged at intervals along a first direction, and each second stationary contact is located on both sides of each first stationary contact along the first direction. On the one hand, compared with the second stationary contacts of two stationary contacts being close to each other, the mutual attraction or interference of electric arcs between the second stationary contacts can be reduced, and the arc extinguishing effect can be improved. On the other hand, it also allows the elastic deformation part fixed to the second moving contact to have a larger deformation space, thereby allowing the second moving contact to have a larger rubbing range on the second stationary contact when it moves, resulting in a better cleaning effect and further reducing the contact resistance of the second moving contact and the second stationary contact. The first arm and the rigid overcurrent bridge are spaced apart along the first direction, and the extension direction of the first arm intersects the first direction. Therefore, the first arm and the second moving contact have a motion component along the first direction. Since the second moving contact also has a motion component along the extension direction of the first arm, and the extension direction of the first arm intersects the first direction, the second moving contact has a motion component in at least two directions during the process of closing or opening with the second stationary contact. During the closing process, the second moving contact and the second stationary contact form frictional movements in multiple directions. In addition, the first moving contact and the first stationary contact also form frictional movements. The frictional movements can break the oxides on the contact surface or clean the carbides generated after arc ablation, etc. The cleaning effect of the contact surface is good, which further reduces the contact resistance and reduces the temperature rise.

[0037] In technical solution nine and its preferred embodiments, the flexible current bridge is further provided with a bridging part, which is integrated with the third arm of the two elastic deformation parts, so that the flexible current bridge forms an integrated frame and the manufacturing process is simpler. The bridging part is fixedly connected to the rigid current bridge through the first moving contact. On the one hand, the bridging part and the rigid current bridge form a parallel current path, reducing local temperature rise. On the other hand, only the bridging part needs to be connected to the rigid current bridge in the flexible current bridge. Compared with the two bridging parts being connected to the rigid current bridge separately, there are fewer installation steps and the structure is more compact. Moreover, the fixed support of the rigid current bridge enhances the overall structural stability of the bridge-type moving contact, which is beneficial to resisting the impact when the moving and stationary contacts come into contact. In addition, the two elastic deformation parts are linked to the rigid current bridge through the bridging part. During the contact process between the first moving contact and the first stationary contact, it is beneficial to evenly distribute the contact pressure of the second moving contact on the second stationary contact.

[0038] In the tenth technical solution and its preferred embodiment, the first arm and the third arm extend along a third direction, and the second arm extends along a first direction. "Extension" means that when the arm is not subjected to external force, its natural extension trajectory extends along a specific direction, but local bending (such as wavy or bent sections) is allowed. Even if the arm is bent locally when it is deformed, its main body direction in the static undeformed state is still along the specific direction, ensuring the controllability of deformation and the predictability of motion trajectory. In this technical solution, both the first and second moving contacts close with their corresponding stationary contacts along the second direction. The structure of the first, second, and third arms forms a U-shaped continuous arm structure. This U-shaped continuous arm structure is more conducive to dispersing deformation stress, and the L-shaped second and third arms are more conducive to amplifying the displacement of the rigid current bridge into multi-directional movement of the second moving contact. This is more beneficial for the movement of the second moving contact along both the first and third directions during the closing process of the bridge-type moving and stationary contacts, which is also more conducive to the frictional rubbing between the second moving contact and the second stationary contact. This advantage is more prominent when the second moving contact is used to connect and disconnect the circuit and the first moving contact is used to carry current, because it can effectively avoid the problem of high contact resistance on the contact surface caused by arcing between the second moving contact and the second stationary contact. In addition, the second moving contact closes along the second direction, while the first arm deforms in the third and first directions, allowing the second moving contact to form a three-dimensional wiping trajectory (such as a spiral or arc) on the second stationary contact, further improving the cleaning effect of the second stationary contact and reducing the contact resistance.

[0039] In technical solution eleven and its preferred embodiment, the bridging portion extends along the first direction, and the third arms of the two elastic deformation portions are respectively connected to the two ends of the bridging portion on the same side along the third direction, so that the two elastic deformation portions are symmetrically connected to the two ends of the bridging portion on the same side, ensuring that the two elastic deformation portions are subjected to balanced force, thereby ensuring that the second moving contacts on both sides move synchronously, avoiding contact pressure deviation, and simplifying the manufacturing process; in addition, it can also enhance the deformation capacity of the two elastic deformation portions; the end of the first arm away from the second arm is provided with a widening section, which is fixedly connected to the second moving contact. The widening section can increase the contact area between the second moving contact and the second stationary contact, reduce the contact resistance, and improve the local heat dissipation capacity, reduce the temperature rise, thereby ensuring the flexibility of the first arm. When the second arm has a bent section, the bent section of the second arm generates an instantaneous displacement along the first direction during the unfolding process when closed, which can enhance the wiping effect of the second moving contact on the second stationary contact. During the closing process of the bridge-type moving and stationary contacts, the bent section will drive the two second moving contacts to move away from each other along the first direction, which means that the second moving contact and the second stationary contact will rub and rub along the first direction. When the bridge switch also has movement along a third direction, the second moving contact and the second stationary contact will rub and rub along the third direction, so that the second moving contact and the second stationary contact have a large rubbing area in both the first and third directions, resulting in a better cleaning effect on the contact surface and a smaller contact resistance.

[0040] In technical solution 12 and its preferred embodiments, the third arms of the two elastic deformation sections are connected as one unit, and the second arms of the two elastic deformation sections are connected as one unit. On the one hand, the integrated arm structure enhances the overall rigidity of the flexible overcurrent bridge and avoids asynchronous operation on both sides. On the other hand, the connected arm structure provides redundant conductive paths, increases the current-carrying area, improves the current-carrying capacity, and further reduces the temperature rise. When the first arm has a bent section, the bent section is suitable for unfolding when the bridge-type moving contact and stationary contact are closed. When the bent section unfolds, the elastic deformation length of the first arm increases, releasing greater elastic potential energy and providing additional contact pressure to ensure that the second moving contact and the second stationary contact are tightly fitted, reducing contact resistance.

[0041] In technical solution thirteen and its preferred embodiment, the third arms of both elastic deformation parts are integrated with the middle part of the bridging part along the first direction, so that the two elastic deformation parts are symmetrically connected to the bridging part. The middle part of the bridging part serves as a rigid support core, which can better resist the torsional torque generated when the second moving contact moves, ensuring the balanced force on the two elastic deformation parts, thereby ensuring the synchronous movement of the second moving contacts on both sides, avoiding contact pressure deviation, and simplifying the manufacturing process. The bridging part is provided with protrusions at both ends along the first direction that protrude toward the second arm. On the one hand, the protrusions can directly transfer the displacement of the rigid flow bridge to the first moving contact, ensuring the reliability of the first moving contact's operation. On the other hand, the protrusions increase the heat conduction cross section, accelerating the transfer of heat from the first moving contact to the rigid flow bridge.

[0042] Technical solution fourteen and its preferred embodiments have the technical advantages of any one of technical solutions one to eleven. In this solution, the moving spring is fixedly connected to both the rigid and flexible current-passing bridges of the bridge-type moving contact; this fixed connection includes both direct and indirect connections.

[0043] In technical solution 15 and its preferred embodiments, the armature is connected to the moving spring and is adapted to drive the bridge-type moving contact to swing. The bridge-type moving contact and the armature are spaced apart along a direction perpendicular to the contact closing direction and the arrangement direction of each stationary contact. The flexible overcurrent bridge has less interference during movement, which is more conducive to the deformation of the elastic deformation part. Therefore, during the closing process of the bridge-type moving contact and the stationary contact, the armature drives the first moving contact and the corresponding stationary contact of the second moving contact to move through the moving spring. This movement direction is the third direction when the contact part includes any of technical solutions 10 to 11. Thus, the first arm has a movement component along the third direction under the drive of the moving spring, so that the second moving contact and the second stationary contact form friction and rubbing in multiple directions. The first moving contact and the first stationary contact also form friction and rubbing. The friction and rubbing can break the oxides on the contact surface or clean the carbides generated after the arc ablation, etc. The cleaning effect of the contact surface is good, further reducing the contact resistance, reducing the temperature rise, and improving the contact life.

[0044] In the sixteenth technical solution and its preferred embodiment, the flexible flow bridge is further provided with a bridging part. The bridging part and the rigid flow bridge are fixed to the moving spring through the first moving contact. The rigidity is high, which is more conducive to the transmission of the movement of the moving spring to the bridge-type moving contact. It is also more conducive to ensuring the synchronous movement (synchronous contact and synchronous disconnection) of the two first moving contacts. It is also conducive to maintaining the contact pressure of the second moving contact on the second stationary contact, thereby ensuring the stable closing and stable disconnection of the bridge-type moving contact and the stationary contact.

[0045] Technical solution seventeen and its preferred embodiments have the technical advantages of any one of technical solutions twelve to thirteen. In this embodiment, the moving spring is fixedly connected to both the rigid and flexible current-carrying bridges of the bridge-type moving contact; this fixed connection includes both direct and indirect connections.

[0046] In technical solution eighteen and its preferred embodiment, the armature is connected to a moving spring and is adapted to drive the bridge-type moving contact to swing. The rigid overcurrent bridge and the armature are spaced apart along a third direction. Therefore, during the closing process of the bridge-type moving contact and the stationary contact, the armature drives the first moving contact and the corresponding stationary contact of the second moving contact to move along a third direction through the moving spring. This causes the first arm to have a motion component along a third direction under the drive of the moving spring, resulting in friction and rubbing between the second moving contact and the second stationary contact in multiple directions. The first moving contact and the first stationary contact also form friction and rubbing. This friction and rubbing can break the oxides on the contact surface or clean the carbides generated after arc ablation, resulting in a good cleaning effect on the contact surface, further reducing contact resistance, reducing temperature rise, and improving contact life. The second arm and the armature at least partially overlap along a third direction on the projection plane perpendicular to the second direction. This also means that the second arm has a larger width, a larger current-carrying area, better current-carrying effect, and lower temperature rise, avoiding the negative impact of excessive temperature rise on the deformation of the elastic deformation part, thereby ensuring the flexibility of the elastic deformation part.

[0047] In the nineteenth technical solution and its preferred embodiment, the armature is provided with a protrusion that is fixedly connected to the moving spring, and the second arm is also provided with a clearance hole that avoids the protrusion from interfering with the movement of the second arm.

[0048] In the 20th technical solution and its preferred embodiment, the flexible overflow bridge is further provided with a bridging part. The bridging part and the rigid overflow bridge are fixed to the moving spring through the first moving contact. The rigidity is high, which is more conducive to the transmission of the movement of the moving spring to the bridge-type moving contact. It is also more conducive to ensuring the synchronous movement (synchronous contact and synchronous disconnection) of the two first moving contacts. It is also conducive to maintaining the contact pressure of the second moving contact on the second stationary contact, thereby ensuring the stable closing and stable disconnection of the bridge-type moving contact and the stationary contact. Attached Figure Description

[0049] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0050] Figure 1 This is an exploded perspective view of Embodiment 1 of this application;

[0051] Figure 2 This is a schematic diagram of the hidden cover in Embodiment 1 of this application;

[0052] Figure 3 This is a schematic diagram of the moving contact and armature in Embodiment 1 of this application;

[0053] Figure 4 This is a top view of the moving contact connected to the armature in Embodiment 1 of this application;

[0054] Figure 5 This is a schematic diagram of the hidden cover in Embodiment 2 of this application;

[0055] Figure 6 This is a schematic diagram of the moving contact and armature in Embodiment 2 of this application;

[0056] Figure 7 This is a top view of the moving contact connected to the armature in Embodiment 2 of this application.

[0057] Explanation of key figure labels:

[0058] Coil assembly 10; iron core 20; yoke 30; first extension arm 31; second extension arm 32; armature 40; protrusion 41; outer shell 50; base 51; cover 52; stationary contact 60; first stationary contact 61; second stationary contact 62; load terminal 63; moving contact assembly 70; first moving contact 71; second moving contact 72; moving spring 73; first connecting part 731; second connecting part 732; connecting arm 733; connecting piece 734; flexible current bridge 74; bridging part 741; protrusion 7411; elastic deformation part 742; first arm 743; widened section 7431; second arm 744; clearance hole 7441; third arm 745; bent section 746; rigid current bridge 75; bridge-type moving contact 76; magnet 80. Detailed Implementation

[0059] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are preferred embodiments of the present utility model and should not be considered as excluding other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0060] Unless otherwise expressly defined, the use of terms such as "first," "second," or "third" in the claims, description, and drawings of this utility model is for distinguishing different objects and not for describing a specific order.

[0061] Unless otherwise expressly defined, in the claims, description, and accompanying drawings of this utility model, the use of directional terms such as "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," and "counterclockwise" to indicate orientation or positional relationships is based on the orientation and positional relationships shown in the accompanying drawings and is only for the convenience of describing this utility model and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the specific protection scope of this utility model.

[0062] Unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" used in the claims, description and drawings of this utility model shall be interpreted broadly to refer to any connection in which there is no displacement or relative rotation relationship between the two parties, including non-removable fixed connection, detachable fixed connection, integral connection and fixed connection through other devices or components.

[0063] In the claims, description and accompanying drawings of this utility model, the terms "comprising", "having", and variations thereof are used to mean "including but not limited to".

[0064] In the claims and the description other than the embodiments, the terms "first direction," "third direction," and "second direction" refer only to a feature having one of the aforementioned directions being perpendicular to a feature having another direction, and do not require that they be implemented according to the "first direction," "third direction," and "second direction" described in the embodiments. In the embodiments, the first direction is perpendicular to both the third direction and the second direction.

[0065] Example 1

[0066] See Figure 1 , Figure 1 A relay is shown, including a magnetic circuit portion and a contact portion. Figure 1 The intermediate relay is a snap-action type relay.

[0067] The magnetic circuit includes a coil assembly 10, an iron core 20, a yoke 30, and an armature 40. The coil assembly 10 includes a coil, a coil frame, and coil terminals. The coil is wound around the coil frame, with the winding axis extending along a second direction. The coil terminals are electrically connected to the coil and extend out of the coil frame. The iron core 20 extends through the coil frame along the second direction, with one end of the iron core 20 along the second direction serving as a magnetic pole face. The yoke 30 has a first extension arm 31 and a second extension arm 32. The first extension arm 31 is fixed to the other end of the iron core 20 extending out of the coil frame and extends along a third direction. The second extension arm 32 is located on a first side of the coil frame along the third direction and extends along the second direction. The armature 40 is positioned near the magnetic pole face of the iron core 20 and can abut against the end of the second extension arm 32 away from the first extension arm 31. The armature 40 can be attracted to or moved away from the magnetic pole face of the iron core 20 by swinging in a plane perpendicular to the first direction.

[0068] The housing 50 includes a base 51 and a cover 52. The base 51 is located on the second side of the coil frame along the third direction and is fixedly connected to the coil frame. The cover 52 covers the coil frame and is fixedly connected to the base 51. A movement space is formed between the cover 52 and the coil frame, which allows the armature 40 to move.

[0069] The contact portion includes two stationary contacts 60 and a moving contact assembly 70. The stationary contacts 60 are fixedly connected to the base 51. Each stationary contact 60 is provided with a first stationary contact 61 and a second stationary contact 62 spaced apart. Each stationary contact 60 is also provided with a load terminal 63 electrically connected to the first stationary contact 61 and the second stationary contact 62. In this embodiment, the first stationary contacts 61 of the two stationary contacts 60 are close to each other, and the second stationary contacts 62 are far apart from each other. For example, the first stationary contacts 61 and the second stationary contacts 62 are spaced apart along a first direction, and each second stationary contact 62 is located on both sides of each first stationary contact 61 along the first direction. That is, the two first stationary contacts 61 are located between the two second stationary contacts 62 along the first direction, and both the first stationary contacts 61 and the second stationary contacts 62 are close to the first end of the coil assembly 10 in the second direction. Figure 1 (At the front end), both load terminals 63 are located on the second side of the coil assembly 10 along a third direction and arranged along the first direction. It should be understood that the number of the first stationary contact 61 and the second stationary contact 62 is not limited to one, and may be two or more.

[0070] The moving contact assembly 70 is used to connect the armature 40. The moving contact assembly 70 has a first moving contact 71 corresponding to the first stationary contact 61 of the two stationary contacts 60, and a second moving contact 72 corresponding to the second stationary contact 62 of the two stationary contacts 60. In this embodiment, the moving contact assembly 70 includes a moving spring 73 and a bridge-type moving contact 76. See [link to previous section]. Figure 2-3The movable spring 73 is provided with a first connecting part 731 fixedly connected to the yoke 30, a second connecting part 732 fixedly connected to the armature 40, a connecting arm 733 and a connecting piece 734. The first connecting part 731 extends along the second direction and is located on the first side of the coil assembly 10 along the third direction. The second connecting part 732 is attached to the armature 40 and extends along the third direction. The first connecting part 731 and the second connecting part 732 are integrally formed and a bend is formed between them. The connecting arm 733 extends along the third direction and is located between the second connecting part 732 and the connecting piece 734. The two ends of the connecting arm 733 along the third direction are respectively connected to the second connecting part 732 and the connecting piece 734 as a whole.

[0071] The bridge-type moving contact 76 includes a rigid flow bridge 75 and a flexible flow bridge 74. The rigid flow bridge 75 has a first moving contact 71 corresponding to the first stationary contact 61 of the two stationary contacts 60; the flexible flow bridge 74 has an elastic deformation portion 742 and a second moving contact 72 corresponding to the second stationary contact 62 of the two stationary contacts 60, the second moving contact 72 being disposed within the elastic deformation portion 742; when the bridge-type moving contact 76 is disconnected from the two stationary contacts 60, the distance between the second moving contact 72 and the second stationary contact 62 is less than the distance between the first moving contact 71 and the first stationary contact 61. The first moving contact 71 and the second moving contact 72 are respectively adapted to close or open with the first stationary contact 61 and the second stationary contact 62 along a second direction.

[0072] In this embodiment, the flexible overcurrent bridge 74 has conductivity and elasticity, and includes both integral and split structures. If a split structure is used, the connection between the split sections must not affect the free deformation of the elastic deformation section 742, and the conductive path must remain continuous; see also Figure 3-4 The flexible flow bridge 74 is provided with an integrally connected bridging portion 741 and two elastically deformable portions 742; the bridging portion 741 extends along a first direction and is fixedly connected to the connecting piece 734 and the rigid flow bridge 75 through a first moving contact 71. It should be understood that in this embodiment, the number of elastically deformable portions 742 should be consistent with the number of second moving contacts 72, and the second moving contact 72 and the corresponding second stationary contact 62 can be in a one-to-one relationship or a many-to-many relationship.

[0073] Each elastic deformation section 742 has a first connecting end and a second connecting end. The second connecting end is fixedly connected to the second moving contact 72. A non-linear elastic deformation path is provided between the second connecting end and the first connecting end. The non-linear elastic deformation path means that the physical path of the elastic deformation section 742 is not linear, such as wavy, spiral, or multi-segment curved structure. The elastic deformation section 742 forms the non-linear elastic deformation path through at least two bends. The elastic deformation section 742 has a bending segment 746, which is located on the deformation transmission path of the elastic deformation section 742. The bending segment 746 is adapted to unfold when the bridge-type moving contact 76 and the stationary contact 60 are closed to provide contact pressure to the second moving contact 72.

[0074] Specifically, see Figure 3 The elastic deformation section 742 is provided with a first arm 743, a second arm 744, and a third arm 745 connected in sequence. The extension direction of the second arm 744 intersects the extension directions of the first arm 743 and the third arm 745. In this embodiment, the first arm 743 and the rigid flow bridge 75 are spaced apart along a first direction; the extension direction of the first arm 743 intersects the first direction. In this embodiment, the first arm 743 and the third arm 745 both extend along a third direction; the second arm 744 extends along the first direction. The first arm 743 and the third arm 745 extend along a third direction, and the second arm 744 extends along the first direction. "Extension" refers to the natural extension trajectory of the arm in a specific direction when no external force is applied, but local bending (such as wavy or bent section 746) is allowed. Even if the arm is locally bent during deformation, its main body direction in the static undeformed state is still along the specific direction, ensuring the controllability of deformation and the predictability of the motion trajectory. The second connecting end is located on the first arm 743, and the first connecting end is located on the third arm 745. The first arm 743 and / or the second arm 744 are provided with a bent section 746, which is bent twice in the opposite direction to make a part of the first arm 743 and / or the second arm 744 extend in a Z-shape. In this embodiment, the bent section 746 is located on the first arm 743.

[0075] See Figure 3-4 The third arms 745 of the two elastic deformation portions 742 are connected as one unit, and the second arms 744 of the two elastic deformation portions 742 are connected as one unit, so that the two elastic deformation portions 742 as a whole form a "mountain" shape. The bridging portion 741 is connected as one unit with the third arms 745 of the two elastic deformation portions 742. Specifically, the third arms 745 of the two elastic deformation portions 742 are connected as one unit with the middle part of the bridging portion 741 along the first direction. The two ends of the bridging portion 741 along the first direction are respectively provided with protrusions 7411 protruding toward the second arm 744. The protrusions 7411 are fixedly connected to the first moving contact 71.

[0076] See Figure 4The armature 40 is provided with a protrusion 41 that is fixedly connected to the movable spring 73, and the second arm 744 is provided with a clearance hole 7441 that avoids the protrusion 41. The inner diameter of the clearance hole 7441 is larger than the outer diameter of the protrusion 41, so that there is a movement margin between the two. In practical applications, this protrusion 41 is used to rivet with the movable spring 73.

[0077] See also Figure 4 In this embodiment, the cross-sectional area of ​​the rigid current bridge 75 is larger than that of the flexible current bridge 74, and / or the conductivity of the rigid current bridge 75 is greater than that of the flexible current bridge 74. On a projection plane perpendicular to the second direction, the rigid current bridge 75 covers the bridging portion 741, and the projected area of ​​the rigid current bridge 75 is larger than that of the bridging portion 741. The thickness of the rigid current bridge 75 is greater than that of the flexible current bridge 74. For example, the rigid current bridge 75 can be made of pure copper in practical applications. In this embodiment, the rigid current bridge 75 and the bridging portion 741 are also fixedly connected to a connecting piece 734, which is sandwiched between the rigid current bridge 75 and the bridging portion 741.

[0078] Therefore, the moving spring 73 is fixedly connected to both the rigid current bridge 75 and the flexible current bridge 74 of the bridge-type moving contact 76. Specifically, the bridging portion 741 and the rigid current bridge 75 are fixed to the moving spring 73 via the first moving contact 71. The rigid current bridge 75 and the armature 40 are spaced apart along a third direction. The armature 40 connects to the moving spring 73 and is adapted to drive the bridge-type moving contact 76 to swing about an axis extending along the first direction in a plane perpendicular to the first direction. It should be understood that "swinging" refers to the rotational movement of the bridge-type moving contact 76 around a certain fulcrum under the drive of the moving spring 73 and the armature 40. In this embodiment, the moving spring 73 is fixedly connected to both the rigid current bridge 75 and the flexible current bridge 74 of the bridge-type moving contact 76. This fixed connection includes both direct and indirect connections.

[0079] In this embodiment, in the disconnected state, the distance between the second moving contact 72 and the second stationary contact 62 along the second direction is less than the distance between the first moving contact 71 and the first stationary contact 61 along the second direction. In one embodiment, in the disconnected state, each first moving contact 71 and each second moving contact 72 has the same height along the second direction, and the second stationary contact 62 protrudes relative to the first stationary contact 61 along the second direction. In another embodiment, each first stationary contact 61 and each second stationary contact 62 has the same height along the second direction, and the second moving contact 72 protrudes relative to the first moving contact 71 along the second direction. This embodiment is mainly achieved by the bending section 746.

[0080] See Figure 2This embodiment also includes two magnets 80 located around the second stationary contact 62. In this embodiment, the magnets 80 are located on both sides of the second stationary contact 62 along the first direction. The magnets 80 are fixedly connected to the base 51. The arrangement of the magnets 80 is beneficial for extinguishing the arc of the second moving contact 72 and the second stationary contact 62.

[0081] In this embodiment, when the bridge-type moving contact 76 and the stationary contact 60 are closed, the first moving contact 71 and the second moving contact 72 are connected in parallel, and each of the first moving contacts 71 is connected in series. This results in low contact resistance, low heat generation at the contacts, reduced temperature rise, reduced contact loss, and extended contact life.

[0082] In this embodiment, in the open state, the distance between the second moving contact 72 and the second stationary contact 62 is smaller than the distance between the first moving contact 71 and the first stationary contact 61. Therefore, when the bridge-type moving contact 76 and the stationary contact 60 are closed, the second moving contact 72 of the flexible current-conducting bridge contacts and conducts current first. When the bridge-type moving contact 76 and the stationary contact 60 are open, the second moving contact 72 of the flexible current-conducting bridge opens later. An electric arc will be generated between the second moving contact 72 and the second stationary contact 62 during the disconnection. However, since the first stationary contact 61 and the second stationary contact 62 are spaced apart, the electric arc during the disconnection of the second moving contact 72 and the second stationary contact 62 is less likely to damage the first moving contact 71 and the second stationary contact 62. The first stationary contact 61 has an effect, thus ensuring the cleanliness of its surface and reducing the contact resistance between the first stationary contact 61 and the first moving contact 71. Because the elastic deformation part 742 deforms during contact or disconnection, it easily drives the second moving contact 72 relative to the second stationary contact 62, rubbing away oxides or carbides generated after arc erosion on the surface of the second stationary contact 62, resulting in excellent cleaning of the contact surface. Therefore, the second moving contact 72, positioned on the elastic deformation part 742, enhances the cleaning effect on the surface of the second stationary contact 62, reducing the contact resistance between the second moving contact 72 and the second stationary contact 62. Consequently, each moving contact and its corresponding stationary contact have lower contact resistance due to the higher cleanliness of the corresponding stationary contact surface. This configuration also allows the rigid overcurrent bridge 75 to carry the main current. Since the resistance of the rigid overcurrent bridge 75 is generally less than that of the flexible overcurrent bridge 74, the heat generation and temperature rise of the entire bridge-type moving contact 76 are low. This avoids the problem of excessive heat affecting the deformation of the elastic deformation part 742 when the bridge-type moving contact 76 is too hot, which would lead to excessively high contact resistance of the second moving contact 72 and the second stationary contact 62. In other words, it reduces the contact resistance of the second moving contact 72 and the second stationary contact 62. At the same time, the first moving contact 71 and the first stationary contact 61 have stable contact and low contact resistance due to the rigid overcurrent bridge 75, thus extending the life of each contact.

[0083] Furthermore, if the second moving contact 72 is disposed on a non-elastic structure, the processing precision requirements for the flexible current bridge 74 are high; otherwise, it is very likely that some moving contacts will be connected while others will not, failing to guarantee the effect of parallel connection and reducing contact resistance. In this embodiment, the second moving contact 72 is disposed on the elastic deformation part 742. The second moving contact 72 of the flexible current bridge contacts and conducts current first. The elastic deformation part 742 generates deformation perpendicular to the contact surface, providing contact pressure and reducing the contact resistance between the second moving contact 72 and the second stationary contact 62. It also allows the second moving contact 72 to move relative to the second stationary contact 62 and rub the oxides on the surface of the second stationary contact 62 or clean the carbides generated after arc ablation. The cleaning effect of the contact surface is good, which is more conducive to ensuring the connection between the second moving contact 72 and the second stationary contact 62 while reducing the processing precision requirements for the flexible current bridge 74, thereby ensuring the current shunting effect of the second moving contact 72 and the effect of reducing contact resistance.

[0084] In this embodiment, when the cross-sectional area of ​​the rigid overcurrent bridge 75 is larger than that of the flexible overcurrent bridge 74, the current carrying capacity of the rigid overcurrent bridge 75 can be improved, the current density reduced, the resistance of the rigid overcurrent bridge 75 reduced, the heat generation of the entire bridge-type moving contact 76 reduced, and the contact resistance between the second moving contact 72 and the second stationary contact 62 reduced. In addition, the flexible overcurrent bridge 74 has a smaller cross-sectional area and can have better elasticity, thereby enabling the second moving contact 72 to have a better cleaning effect during the opening or closing process with the second stationary contact 62. When the conductivity of the rigid overcurrent bridge 75 is greater than that of the flexible overcurrent bridge 74, the rigid overcurrent bridge 75 can be made of a material with higher conductivity than the flexible overcurrent bridge 74. This is because in the prior art, in order to ensure the flexibility of the conductive material, other elements are usually added to the conductive material. However, after doping, the conductivity of the conductive material will decrease, the current carrying capacity will decrease, and problems such as temperature increase will be brought about. The rigid overcurrent bridge 75 can have a higher current carrying capacity without doping. Therefore, the rigid overcurrent bridge 75 has a higher current carrying capacity and lower resistance than the flexible overcurrent bridge 74, which is more conducive to reducing the heat generation of the entire bridge moving contact 76, thereby reducing the contact resistance of the second moving contact 72 and the second stationary contact 62.

[0085] In this embodiment, the number of elastic deformation portions 742 corresponds to the number of second moving contacts 72, which can avoid uneven pressure caused by a single elastic deformation portion 742 driving multiple second moving contacts 72 and reduce the overall contact resistance. Compared with a linear path, the nonlinear elastic deformation path can increase the effective deformation length, improve the elastic deformation capability, make the displacement of the second moving contact 72 larger and have multi-directional deformation, so that the rubbing range between the second moving contact 72 and the second stationary contact 62 is larger, the contact surface cleaning effect is better, and thus it is more conducive to reducing the contact resistance between the second moving contact 72 and the second stationary contact 62.

[0086] In this embodiment, the number and angle of the bends can adjust the stiffness and deformation of the elastic deformation part 742, optimize the displacement trajectory of the second moving contact 72, and enhance the contact cleaning effect.

[0087] In this embodiment, the bending segment 746 expands and releases elastic potential energy when closed, which can provide additional contact pressure to the second moving contact 72, reducing the contact resistance between the second moving contact 72 and the second stationary contact 62. In addition, the bending segment 746 will also drive the second moving contact 72 to move during the expansion process, further enhancing the friction cleaning effect between the second moving contact 72 and the second stationary contact 62.

[0088] In this embodiment, the difference in the extension directions of the first arm 743, the second arm 744, and the third arm 745 causes the elastic deformation portion 742 to form two bends, and causes the elastic deformation portion 742 to undergo compound deformation when subjected to force, thereby enhancing the displacement flexibility of the second moving contact 72. In addition, the structure of the first arm 743, the second arm 744, and the third arm 745 forms a continuous arm structure, which is more conducive to dispersing deformation stress. This structure also allows the second moving contact 72 to be displaced in at least two directions, namely the extension direction of the first arm 743 and the extension direction of the second arm 744, which is more conducive to the large-range rubbing of the second moving contact 72 on the second stationary contact 62, thereby enhancing the cleaning effect between the contacts.

[0089] In this embodiment, the first arm 743 and / or the second arm 744 are provided with a bending section 746. When the bending section 746 is closed, it unfolds and releases elastic potential energy, which can provide additional contact pressure to the second moving contact 72, reducing the contact resistance between the second moving contact 72 and the second stationary contact 62. In addition, the bending section 746 also drives the second moving contact 72 to shift during the unfolding process, further enhancing the frictional cleaning effect between the second moving contact 72 and the second stationary contact 62. Among them, the Z-shaped structure of the first arm 743 and / or the second arm 744 releases even greater elastic potential energy when unfolded, further providing stable contact pressure to the second moving contact 72 and reducing the contact resistance between the second moving contact 72 and the second stationary contact 62. When the bent section 746 is located in the first arm 743, the bent section 746 is located on the deformation transmission path of the first arm 743. When the bridge-type moving contact 76 and the stationary contact 60 are closed, the bent section 746 unfolds and directly contacts the second moving contact 72. The contact pressure of the second moving contact 72 is greater, the contact between the second moving contact 72 and the second stationary contact 62 is more stable, and the contact resistance is smaller.

[0090] In this embodiment, each first stationary contact 61 is arranged at intervals along the first direction, and each second stationary contact 62 is located on both sides of each first stationary contact 61 along the first direction. On the one hand, compared with the two stationary contacts 60, the second stationary contacts 62 are closer to each other, which can reduce the mutual attraction or interference of electric arcs between the second stationary contacts 62 and improve the arc extinguishing effect. On the other hand, it also allows the elastic deformation part 742 fixed to the second moving contact 72 to have a larger deformation space, thereby allowing the second moving contact 72 to have a larger rubbing range on the second stationary contact 62 when it moves, resulting in a better cleaning effect and further reducing the contact resistance of the second moving contact 72 and the second stationary contact 62. The first arm 743 and the rigid overcurrent bridge 75 are spaced apart along the first direction. The extension direction of the first arm 743 intersects the first direction. Therefore, the first arm 743 and the second moving contact 72 have motion components along the first direction. Since the second moving contact 72 also has motion components along the extension direction of the first arm 743, and the extension direction of the first arm 743 intersects the first direction, the second moving contact 72 has motion components in at least two directions during the process of closing or opening with the second stationary contact 62. During the closing process, the second moving contact 72 and the second stationary contact 62 form frictional movements in multiple directions. In addition, the first moving contact 71 and the first stationary contact 61 also form frictional movements. The frictional movements can break the oxides on the contact surface or clean the carbides generated after arc ablation, etc. The cleaning effect of the contact surface is good, which further reduces the contact resistance and reduces the temperature rise.

[0091] In this embodiment, the flexible current bridge 74 is further provided with a bridging portion 741, which is integrated with the third arm 745 of the two elastic deformation portions 742, so that the flexible current bridge 74 forms an integrated frame, simplifying the manufacturing process. The bridging portion 741 is fixedly connected to the rigid current bridge 75 through the first moving contact 71. On the one hand, the bridging portion 741 and the rigid current bridge 75 form a parallel current path, reducing local temperature rise. On the other hand, in the flexible current bridge 74, only the bridging portion 741 needs to be connected to the rigid current bridge 75. Compared to connecting the two bridging parts 741 to the rigid overcurrent bridge 75 respectively, the installation steps are fewer and the structure is more compact. The fixed support of the rigid overcurrent bridge 75 enhances the overall structural stability of the bridge-type moving contact 76, which is beneficial to resisting the impact when the moving and stationary contacts come into contact. In addition, the two elastic deformation parts 742 are linked with the rigid overcurrent bridge 75 through the bridging parts 741. During the contact between the first moving contact 71 and the first stationary contact 61, it is beneficial to evenly distribute the contact pressure of the second moving contact 72 on the second stationary contact 62.

[0092] In this embodiment, the first moving contact 71 and the second moving contact 72 are both closed with the corresponding stationary contact along the second direction. The structure of the first arm 743, the second arm 744 and the third arm 745 forms a U-shaped continuous arm structure. The U-shaped continuous arm structure is more conducive to dispersing deformation stress, and the L-shaped second arm 744 and the third arm 745 are more conducive to amplifying the displacement of the rigid overcurrent bridge 75 into multi-directional movement of the second moving contact 72. It is also more conducive to the movement of the second moving contact 72 along the first direction and the third direction during the closing process of the bridge-type moving contact 76 and the stationary contact 60. That is, it is more conducive to the friction and rubbing between the second moving contact 72 and the second stationary contact 62. This advantage is more prominent when the second moving contact 72 is used to connect and disconnect the circuit and the first moving contact 71 is used to carry current, because it can effectively avoid the problem of high contact resistance on the contact surface caused by arcing between the second moving contact 72 and the second stationary contact 62. Furthermore, the second moving contact 72 closes along the second direction, while the first arm 743 deforms in the third and first directions, so that the second moving contact 72 can form a three-dimensional wiping trajectory (such as a spiral or arc) on the second stationary contact 62, which further improves the cleaning effect of the second stationary contact 62 and reduces the contact resistance.

[0093] In this embodiment, the third arms 745 of the two elastic deformation parts 742 are connected as one unit, and the second arms 744 of the two elastic deformation parts 742 are connected as one unit. On the one hand, the integrated arm structure enhances the overall rigidity of the flexible overcurrent bridge 74 and avoids asynchronous operation on both sides. On the other hand, the connected arm structure provides redundant conductive paths, increases the current-carrying area, improves the current-carrying capacity, and further reduces the temperature rise. When the first arm 743 is provided with a bending section 746, the bending section 746 is suitable for unfolding when the bridge-type moving contact 76 and the stationary contact 60 are closed. When the bending section 746 unfolds, the elastic deformation length of the first arm 743 increases, releasing greater elastic potential energy and providing additional contact pressure to ensure that the second moving contact 72 and the second stationary contact 62 are tightly fitted, reducing the contact resistance.

[0094] In this embodiment, the third arms 745 of the two elastic deformation parts 742 are integrated with the middle of the bridging part 741 along the first direction, so that the two elastic deformation parts 742 are symmetrically connected to the bridging part 741. The middle of the bridging part 741 serves as a rigid support core, which can better resist the torsional torque generated when the second moving contact 72 moves, ensuring that the two elastic deformation parts 742 are subjected to balanced force, thereby ensuring that the second moving contacts 72 on both sides move synchronously, avoiding contact pressure deviation, and simplifying the manufacturing process. The bridging part 741 is provided with protrusions 7411 at both ends along the first direction, which protrude toward the second arm 744. On the one hand, the protrusions 7411 can directly transfer the displacement of the rigid overcurrent bridge 75 to the first moving contact 71, ensuring the reliability of the first moving contact 71. On the other hand, the protrusions 7411 increase the heat conduction cross section, accelerating the transfer of heat from the first moving contact 71 to the rigid overcurrent bridge 75.

[0095] In this embodiment, the armature 40 is connected to the moving spring 73 and is adapted to drive the bridge-type moving contact 76 to swing. The rigid overcurrent bridge 75 and the armature 40 are spaced apart along the third direction. Therefore, during the closing process of the bridge-type moving contact 76 and the stationary contact 60, the armature 40 drives the corresponding stationary contacts of the first moving contact 71 and the second moving contact 72 to move along the third direction through the moving spring 73. This causes the first arm 743 to have a motion component along the third direction under the drive of the moving spring 73, so that the second moving contact 72 and the second stationary contact 62 form friction and rubbing in multiple directions. The first moving contact 71 and the first stationary contact 61 also form friction and rubbing. The friction and rubbing can break the oxides on the contact surface or clean the carbides generated after the arc ablation. The cleaning effect of the contact surface is good, which further reduces the contact resistance, reduces the temperature rise, and improves the contact life. The second arm 744 and the armature 40 overlap at least partially along the third direction on the projection plane perpendicular to the second direction. This means that the second arm 744 has a larger width, a larger current-carrying area, better current-carrying effect, and lower temperature rise, thereby ensuring the flexibility of the elastic deformation part 742.

[0096] In this embodiment, the armature 40 is provided with a protrusion 41 that is fixedly connected to the movable spring 73, and the second arm 744 is also provided with a clearance hole 7441 that avoids the protrusion 41 from interfering with the movement of the second arm 744.

[0097] In this embodiment, the flexible flow bridge 74 is further provided with a bridging part 741. The bridging part 741 and the rigid flow bridge 75 are fixed to the moving spring 73 through the first moving contact 71. The rigidity is high, which is more conducive to the transmission of the movement of the moving spring 73 to the bridge-type moving contact 76. It is also more conducive to ensuring the synchronous movement (synchronous contact and synchronous disconnection) of the two first moving contacts 71. It is also conducive to maintaining the contact pressure of the second moving contact 72 on the second stationary contact 62, thereby ensuring the stable closing and stable disconnection of the bridge-type moving contact 76 and the stationary contact 60.

[0098] Example 2

[0099] Example 2 is basically the same as Example 1 in structure, except that the flexible flow bridge 74 in Example 2 has a different structure. For details, see [link to example]. Figure 5-7In this embodiment, the bridge-type moving contact 76 and the armature 40 are spaced apart along a direction perpendicular to the contact closing direction and the arrangement direction of each stationary contact. In this embodiment, the bridge-type moving contact 76 and the armature 40 are spaced apart along a third direction. Therefore, the elastic deformation portion 742 and the armature 40 are staggered from each other along a third direction on the projection plane perpendicular to the second direction. The third arms 745 of the two elastic deformation portions 742 are respectively connected to the two ends of the bridging portion 741 on the same side along the third direction. The second arm 744 is provided with a bent section 746, which is adapted to unfold when the bridge-type moving contact 76 and the stationary contact 60 are closed. The end of the first arm 743 away from the second arm 744 is provided with a widened section 7431, which is fixedly connected to the second moving contact 72.

[0100] In this embodiment, when the bent section 746 is provided in the second arm 744, the second arm 744 connects the first arm 743 and the third arm 745. When the bent section 746 of the second arm 744 is unfolded, it is easy to drive the second moving contact 72 to move along the extension direction of the second arm 744. This is more conducive to the second moving contact 72 moving in at least two directions, namely the extension direction of the first arm 743 and the extension direction of the second arm 744. It is also more conducive to the second moving contact 72 rubbing the second stationary contact 62 over a wide range, thus enhancing the cleaning effect between the contacts.

[0101] In this embodiment, the third arms 745 of the two elastic deformation parts 742 are respectively connected to the two ends of the bridging part 741 on the same side along the third direction, so that the two elastic deformation parts 742 are symmetrically connected to the two ends of the bridging part 741 on the same side, ensuring that the two elastic deformation parts 742 are subjected to balanced force, thereby ensuring that the second moving contacts 72 on both sides move synchronously, avoiding contact pressure deviation, and simplifying the manufacturing process; in addition, it can also enhance the deformation capability of the two elastic deformation parts 742; the end of the first arm 743 away from the second arm 744 is provided with a widening section 7431, which is fixed to the second moving contact 72. The widening section 7431 can increase the contact area between the second moving contact 72 and the second stationary contact 62 and reduce the contact resistance, and improve the local heat dissipation capacity and reduce the temperature rise, thereby ensuring the flexibility of the first arm 743. When the second arm 744 is provided with a bending section 746, the bending section 746 of the second arm 744 generates an instantaneous displacement along the first direction during the unfolding process when closed, which can enhance the wiping effect of the second moving contact 72 on the second stationary contact 62. During the closing process of the bridge-type moving contact 76 and stationary contact 60, the bending section 746 will drive the two second moving contacts 72 to move away from each other along the first direction, which means that the second moving contact 72 and the second stationary contact 62 rub and rub along the first direction. When the bridge switch also has movement along a third direction, the second moving contact 72 and the second stationary contact 62 rub and rub along the third direction, so that the second moving contact 72 and the second stationary contact 62 have a large rubbing area in both the first direction and the third direction, resulting in a better cleaning effect on the contact surface and a smaller contact resistance.

[0102] In this embodiment, the armature 40 is connected to the movable spring 73 and is adapted to drive the bridge-type movable contact 76 to swing. The bridge-type movable contact 76 and the armature 40 are spaced apart along a direction perpendicular to the contact closure direction and the arrangement direction of each stationary contact. The flexible overcurrent bridge 74 experiences less interference during movement, which is more conducive to the deformation of the elastic deformation part 742. Therefore, during the closing process of the bridge-type movable contact 76 and the stationary contact 60, the armature 40 drives the corresponding stationary contacts of the first movable contact 71 and the second movable contact 72 to move through the movable spring 73. The first arm 743 has a third-direction motion component under the drive of the moving spring 73, which causes the second moving contact 72 and the second stationary contact 62 to form friction and rubbing in multiple directions. The first moving contact 71 and the first stationary contact 61 also form friction and rubbing. The friction and rubbing can break the oxides on the contact surface or clean the carbides produced after the arc ablation. The cleaning effect of the contact surface is good, which further reduces the contact resistance, reduces the temperature rise, and improves the contact life.

[0103] It should be understood that although the bridge-type moving contact 76 and the contact portion in Embodiments 1 and 2 provided in this application are described with a snap-action relay as an exemplary application scenario, the scope of protection of its technical solution is not limited thereto. Based on the ordinary technical knowledge of those skilled in the art, without departing from the core utility model concept of this application, the structural design of the bridge-type moving contact 76 and the contact portion can be adaptively adjusted and extended to other types of relays, and such variations or derivative applications should still be considered to fall within the scope of protection defined by the claims of this application.

[0104] The foregoing description of the specifications and embodiments is intended to explain the scope of protection of this utility model, but does not constitute a limitation on the scope of protection of this utility model. Modifications, equivalent substitutions, or other improvements to the embodiments of this utility model or a portion thereof that can be obtained by those skilled in the art through logical analysis, reasoning, or limited experimentation, based on the teachings of this utility model or the foregoing embodiments, should all be included within the scope of protection of this utility model.

Claims

1. A bridge switch comprising two stationary contacts (60) and a bridge-type moving contact (76); characterized in that, Each stationary contact (60) is provided with a first stationary contact (61) and a second stationary contact (62) at intervals; The bridge-type moving contact (76) includes a rigid flow bridge (75) and a flexible flow bridge (74). The rigid flow bridge (75) has a first moving contact (71) corresponding to the first stationary contact (61) of the two stationary contacts (60). When the bridge-type moving contact (76) is disconnected from the two stationary contacts (60), the distance between the second moving contact (72) and the second stationary contact (62) is smaller than the distance between the first moving contact (71) and the first stationary contact (61). The flexible flow bridge (74) is provided with an elastic deformation part (742), and a second moving contact (72) is provided corresponding to the second static contact (62) of the two static contacts (60), and the second moving contact (72) is disposed on the elastic deformation part (742).

2. A bridge switch as described in claim 1, characterized in that, The cross-sectional area of ​​the rigid overcurrent bridge (75) is greater than that of the flexible overcurrent bridge (74), and / or the conductivity of the rigid overcurrent bridge (75) is greater than that of the flexible overcurrent bridge (74).

3. A bridge switch as described in claim 1, characterized in that, The number of elastic deformation parts (742) corresponds to the number of second moving contacts (72); each elastic deformation part (742) is provided with a first connecting end and a second connecting end, the second connecting end is fixedly connected to the second moving contact (72), and a nonlinear elastic deformation path is provided between the second connecting end and the first connecting end.

4. A bridge switch as described in claim 3, characterized in that, The elastic deformation section (742) forms a nonlinear elastic deformation path through at least two bends.

5. A bridge switch as described in any one of claims 1-4, characterized in that, The elastic deformation part (742) is provided with a bending section (746), which is located on the deformation transmission path of the elastic deformation part (742) and is adapted to unfold when the bridge-type moving contact (76) and the stationary contact (60) are closed.

6. A bridge switch as described in claim 4, characterized in that, The elastic deformation part (742) is provided with a first arm (743), a second arm (744) and a third arm (745) connected in sequence. The extension direction of the second arm (744) intersects the extension directions of the first arm (743) and the third arm (745). The second connecting end is provided on the first arm (743) and the first connecting end is provided on the third arm (745).

7. A bridge switch as described in claim 6, characterized in that, The first arm (743) and / or the second arm (744) are provided with a bent section (746), which is formed by two consecutive reverse bends to make a portion of the first arm (743) and / or the second arm (744) extend in a Z-shape. The bent section (746) is adapted to unfold when the bridge-type moving contact (76) and the stationary contact (60) are closed.

8. A bridge switch as described in claim 6 or 7, characterized in that, Each first stationary contact (61) is arranged at intervals along the first direction, and each second stationary contact (62) is located on both sides of each first stationary contact (61) along the first direction; the first arm (743) and the rigid flow bridge (75) are arranged at intervals along the first direction; the extension direction of the first arm (743) intersects with the first direction.

9. A bridge switch as described in claim 8, characterized in that, The number of elastic deformation parts (742) is two; the flexible flow bridge (74) is also provided with a bridging part (741), the bridging part (741) is connected to the third arm (745) of the two elastic deformation parts (742) as a whole, and the bridging part (741) is fixedly connected to the rigid flow bridge (75) through the first moving contact (71).

10. A bridge switch as described in claim 9, characterized in that, The first moving contact (71) and the second moving contact (72) are respectively adapted to close or open with the first stationary contact (61) and the second stationary contact (62) in the second direction; the first arm (743) and the third arm (745) both extend in the third direction; the second arm (744) extends in the first direction; the first direction, the second direction and the third direction are orthogonal.

11. A bridge switch as described in claim 10, characterized in that, The bridging portion (741) extends along a first direction, and the third arms (745) of the two elastic deformation portions (742) are connected to the two ends of the bridging portion (741) on the same side along the third direction. The first arm (743) has a widened section (7431) at one end away from the second arm (744), and the widened section (7431) is fixedly connected to the second moving contact (72).

12. A bridge switch as described in claim 10, characterized in that, The third arms (745) of the two elastic deformation parts (742) are connected as one unit, and the second arms (744) of the two elastic deformation parts (742) are connected as one unit.

13. A bridge switch as described in claim 12, characterized in that, The bridging portion (741) extends along the first direction, and the third arms (745) of the two elastic deformation portions (742) are connected to the middle of the bridging portion (741) along the first direction. The bridging portion (741) has protrusions (7411) at both ends along the first direction that protrude toward the second arm (744). The protrusions (7411) are fixedly connected to the first moving contact (71).

14. A relay, characterized in that, The switch includes a movable reed (73) and a bridge switch according to any one of claims 1-11, wherein the movable reed (73) is fixedly connected to both the rigid current bridge (75) and the flexible current bridge (74) of the bridge movable contact (76).

15. A relay as described in claim 14, characterized in that, It also includes an armature (40), which is connected to a moving spring (73) and is adapted to drive the bridge-type moving contact (76) to swing; the bridge-type moving contact (76) and the armature (40) are spaced apart along a direction perpendicular to the contact closing direction and the arrangement direction of each stationary contact.

16. A relay as described in claim 14, characterized in that, The flexible flow bridge (74) is also provided with a bridging part (741), and the bridging part (741) and the rigid flow bridge (75) are fixed to the moving spring (73) through the first moving contact (71).

17. A relay, characterized in that, The switch includes a movable reed (73) and a bridge switch according to any one of claims 12-13, wherein the movable reed (73) is fixedly connected to both the rigid current bridge (75) and the flexible current bridge (74) of the bridge movable contact (76).

18. A relay as described in claim 17, characterized in that, It also includes an armature (40) that is connected to a moving spring (73) and is adapted to drive a bridge-type moving contact (76) to swing; the rigid flow bridge (75) and the armature (40) are spaced apart along a third direction; the second arm (744) and the armature (40) overlap at least partially along a third direction on a projection plane perpendicular to the second direction.

19. A relay as described in claim 18, characterized in that, The armature (40) is provided with a protrusion (41) fixedly connected to the movable spring (73), and the second arm (744) is also provided with a clearance hole (7441) that avoids the protrusion (41).

20. A relay as described in claim 17, characterized in that, The flexible flow bridge (74) is also provided with a bridging part (741), and the bridging part (741) and the rigid flow bridge (75) are fixed to the moving spring (73) through the first moving contact (71).

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