relay

Abstract

The present invention relates to a relay comprising a moving spring portion, a stationary spring portion, and a drive group. The moving spring portion comprises a plurality of moving spring pieces provided with moving contacts and a plurality of moving spring lead pieces connected to the moving spring pieces via flexible conductive points. The stationary spring portion comprises a plurality of stationary spring pieces provided with stationary contacts. The moving spring portion is connected in parallel to a first interface of an output circuit via the plurality of moving spring lead pieces, and the stationary spring portion is connected in parallel to a second interface of the output circuit via the plurality of stationary spring pieces. The drive group drives the plurality of moving spring pieces to operate simultaneously, causing the plurality of moving contacts to contact the plurality of stationary contacts simultaneously, thereby shunting current flowing into the relay from the output circuit. This reduces the Holm force between the contacts when a short circuit occurs, thereby improving the short-circuit resistance of the relay.

Description

Technical Field

[0001] The present invention relates to the technical field of electric control devices, in particular to a relay. Background Art

[0002] A relay is an electronic control device with a control system (also known as an input circuit) and a controlled system (also known as an output circuit). It is commonly used in automatic control circuits, controlling the on / off state of the controlled system by closing and opening its contacts. In other words, a relay is essentially an "automatic switch" that uses a smaller current and lower voltage to control a larger current and higher voltage. Therefore, it plays a role in automatic regulation, safety protection, and circuit switching within circuits.

[0003] When a short circuit occurs in a device connected to a relay, the short-circuit current flows through the relay's moving and stationary contacts, generating a strong repulsive force between them, separating them and ultimately causing a violent arcing phenomenon, causing the relay to fail. Therefore, improving the relay's short-circuit resistance and ensuring its reliability remains a challenge. Summary of the Invention

[0004] Therefore, in order to solve the above problems, the present invention proposes a relay with optimized structure.

[0005] The present invention is implemented by the following technical solutions:

[0006] The contact switch assembly proposed in the present invention includes a dynamic spring portion, a static spring portion, and a drive group. The dynamic spring portion includes multiple dynamic spring pieces provided with dynamic contacts and multiple dynamic spring lead-out pieces connected to the dynamic spring pieces via flexible conductive members. The static spring portion includes multiple static spring pieces provided with static contacts. The dynamic spring portion is connected in parallel to a first interface of an output circuit via the multiple dynamic spring lead-out pieces, and the static spring portion is connected in parallel to a second interface of the output circuit via the multiple static spring pieces. The drive group drives the multiple dynamic spring pieces to operate simultaneously, causing the multiple dynamic contacts to contact the multiple static contacts simultaneously, thereby shunting the current flowing from the output circuit into the relay.

[0007] In one embodiment, the flexible conductive member is arranged between the dynamic spring piece and the dynamic spring lead-out piece, one end of the flexible conductive member is connected to the dynamic contact on the dynamic spring piece, and the other end of the flexible conductive member is connected to the dynamic spring lead-out piece.

[0008] In one embodiment, the flexible conductive member is a wire braided belt woven from multiple wires or the flexible conductive member is a metal conductive sheet, and the flexible conductive member includes a first section, a second section and a third section that are continuously bent, the first section is fitted and connected to the moving contact, the third section is fitted and connected to the dynamic spring lead-out sheet, and the first section and the third section can open or close relative to the second section to adapt to the movement of the dynamic spring sheet.

[0009] In one embodiment, the static spring portion further includes a plurality of static spring lead-out pieces connected to the static spring piece, the static spring piece being arranged between the static spring lead-out piece and the dynamic spring piece, the static spring portion being connected in parallel to the first interface of the output circuit through the plurality of static spring lead-out pieces, and when the static spring portion is energized, the current directions on the static spring piece and the static spring lead-out piece are opposite, so that the static spring piece has an electric force to move toward the side of the dynamic spring piece, and the electric force can resist the Holm force between the contacts.

[0010] In one embodiment, the static spring piece is in the shape of a flat piece, the static spring lead-out piece includes a bent section, and a movable gap is formed between the bent section and the static spring piece for the static spring piece to deform.

[0011] In one embodiment, the static reed is configured to have an initial pressure moving toward one side of the dynamic reed, and the initial pressure can resist the Holm force between the contacts.

[0012] In one embodiment, the relay further includes a base and a limit block, the base is provided with a slot, and the slot is provided at the lower end of the static spring, the limit block is inserted into the slot, and the static spring elastically presses against the limit block so that the static spring has an initial pressure to move toward the side of the dynamic spring.

[0013] In one embodiment, the movable spring is continuously bent in a "Z" shape.

[0014] In one embodiment, the driving group includes an armature, a push card and a coil, the armature is connected to multiple movable springs through the push card, and the coil is used to drive the armature to drive multiple movable springs to move simultaneously, so that multiple movable contacts contact multiple static contacts at the same time.

[0015] The technical solution provided by the present invention has the following beneficial effects: the dynamic spring portion is connected in parallel to the first interface of the output circuit via multiple dynamic spring lead-out pieces, and the static spring portion is connected in parallel to the second interface of the output circuit via multiple static spring pieces. Therefore, when a large current in the output circuit flows into the relay, it is divided into multiple smaller currents, reducing the Hom force between the contacts in the event of a short circuit and improving the relay's short-circuit resistance. Furthermore, based on the design that the large current in the output circuit is divided into multiple smaller currents when flowing into the relay, thereby reducing the Hom force between the contacts, while maintaining the same short-circuit resistance (i.e., when the output circuit current remains unchanged), the Hom force between the contacts is correspondingly reduced due to the reduced short-circuit current between the contacts after being divided. This reduces the driving force requirement for the dynamic spring piece, thereby reducing the number of turns of the coil within the relay and lowering manufacturing costs. On the contrary, when the number of turns of the coil in the relay remains unchanged, that is, the driving force on the moving reed remains unchanged, since the Holm force between the contacts that can be resisted remains unchanged, and the short-circuit current between the contacts is reduced after being shunted, the current of the output circuit can be increased, thereby improving the short-circuit resistance of the relay and the reliability of the relay. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 FIG. 1 is a perspective view of a relay (without a housing) according to an embodiment of the present invention.

[0017] Figure 2 yes Figure 1 side view.

[0018] Figure 3 yes Figure 2 sectional view of .

[0019] Figure 4 yes Figure 1 A three-dimensional diagram of the contact group and drive group in FIG.

[0020] Figure 5 yes Figure 4 A three-dimensional diagram of the contact group in the closed state.

[0021] Figure 6 yes Figure 5 side view.

[0022] Figure 7 yes Figure 4 A three-dimensional diagram of the contact group in the open state.

[0023] Figure 8 yes Figure 7 side view.

[0024] Figure 9 This is a force analysis diagram between contact groups in a relay.

[0025] Figure 10This is a simplified diagram of the structure of the relay and output circuit in the first state.

[0026] Figure 11 This is a simplified diagram of the structure of the relay and output circuit in the second state. DETAILED DESCRIPTION

[0027] To further illustrate various embodiments, the present invention is provided with accompanying drawings. These drawings form part of the present disclosure and are primarily used to illustrate the embodiments and, in conjunction with the relevant description in the specification, to explain the operating principles of the embodiments. By referring to these drawings, one of ordinary skill in the art will understand other possible embodiments and the advantages of the present invention. The components in the figures are not drawn to scale, and similar reference numerals are generally used to represent similar components.

[0028] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0029] See also Figure 1 For the convenience of description, unless otherwise specified, the directions of front, back, left, right, up and down are all expressed in Figure 1 The X direction is shown as the front, the opposite direction is the back, the Y direction is shown as the left, the opposite direction is the right, and the Z direction is shown as the top, the opposite direction is shown as the bottom.

[0030] Still see Figure 1 A relay 100 provided in one embodiment of the present invention includes a housing (not shown), a contact group 2, and a driver group 3. The housing can be formed of an insulating resin and is generally rectangular in shape. The housing defines a mounting cavity for mounting the contact group 2 and the driver group 3, thereby protecting them. The housing includes a base 1 and an outer shell, with the contact group 2 and the driver group 3 mounted on the base 1. The outer shell defines a mounting cavity, which covers the base 1 and houses the contact group 2 and the driver group 3 within the mounting cavity.

[0031] See also Figures 1 to 11 Contact group 2 is disposed within the housing and connected to output circuit 200. Contact group 2 has a switching function, connecting or disconnecting output circuit 200. Specifically, contact group 2 includes a movable spring portion and a stationary spring portion, both of which are made of conductive material. The movable spring portion and the stationary spring portion are connected to a first interface 202 and a second interface 201 of output circuit 200, respectively. When the movable spring portion and the stationary spring portion are in contact, the output circuit 200 is connected. When the movable spring portion and the stationary spring portion are separated, the output circuit 200 is disconnected, thereby controlling the connection or disconnection of the output circuit 200.

[0032] See also Figures 2 to 4The movable spring portion includes a movable spring piece 21, a movable spring lead-out piece 22, and a flexible conductive member 23. The movable spring piece 21 is movably arranged above the base 1. A movable contact 210 is provided at the lower end of the movable spring piece 21. There are multiple movable spring pieces 21, which are arranged side by side and spaced apart. The movable spring lead-out piece 22 is inserted into the base 1 and is located in front of the movable spring piece 21. The upper end of the movable spring lead-out piece 22 is located above the base 1, and the lower end of the movable spring lead-out piece 22 is located below the base 1. There are multiple movable spring lead-out pieces 22, which are arranged side by side and spaced apart, and the multiple movable spring lead-out pieces 22 are arranged in a one-to-one correspondence with the multiple movable spring pieces 21. There are multiple flexible conductive members 23, which connect the movable spring pieces 21 and the movable spring lead-out pieces 22 in a one-to-one correspondence. The flexible conductive member 23 is flexible to adapt to the movement of the movable spring piece 21.

[0033] The static spring portion includes a static spring piece 24 and a static spring lead-out piece 25. The static spring piece 24 is located above the base 1 and behind the dynamic spring piece 21. A static contact 240 is provided at the lower end of the static spring piece 24. Multiple static spring pieces 24 are provided, spaced side by side. The static spring lead-out piece 25 is inserted into the base 1 and located behind the static spring piece 24. The upper end of the static spring lead-out piece 25 is located above the base 1 and is fixedly connected to the upper end of the static spring piece 24. The lower end of the static spring lead-out piece 25 is located below the base 1. Multiple static spring lead-out pieces 25 are provided, spaced side by side, and are arranged in a one-to-one correspondence with multiple static spring pieces 24. The multiple static springs 24 are arranged in a one-to-one correspondence with the multiple dynamic springs 21. That is, the number of dynamic springs 21, dynamic spring lead-out pieces 22, flexible conductive members 23, static springs 24, and static spring lead-out pieces 25 are equal and arranged in a one-to-one correspondence. In other embodiments, there may be only one static spring lead-out piece 25, with multiple static springs 24 connected in parallel to the static spring lead-out piece 25. There may also be only one dynamic spring lead-out piece 22, with multiple dynamic springs 21 connected in parallel to the dynamic spring lead-out piece 22. That is, the number of static springs 24 is the same as the number of dynamic springs 21, and they correspond one-to-one. However, the number of static spring lead-out pieces 25 and static springs 24 may be different, and the number of dynamic spring lead-out pieces 22 and dynamic springs 21 may be different.

[0034] When the relay 100 is in use, the lower ends of the multiple dynamic spring leads 22 are connected in parallel to the first interface 202 of the output circuit 200, and the lower ends of the multiple static spring leads 25 are connected in parallel to the second interface 201 of the output circuit 200. When the dynamic spring 21 moves backward, closing the dynamic contact 210 and the static contact 240, the output circuit 200 is connected. At this time, a contact pressure F1 is generated between the dynamic contact 210 and the static contact 240. The contact pressure F1 can resist the Holm force F4 between the contacts when a short-circuit current is generated. The large current in the output circuit 200 is divided into multiple smaller currents when passing through the multiple dynamic spring leads 22. The current then flows through the flexible conductive member 23 and the dynamic spring 21 to the static spring 24 and static spring leads 25. Therefore, when the movable contact 210 and the stationary contact 240 are closed, the current flowing from the movable contact 210 to the stationary contact 240 is a small current after being diverted, which reduces the Holm force F4 between the contacts when a short circuit occurs and improves the short circuit resistance of the relay 100.

[0035] Furthermore, based on the design that shuns the high current in output circuit 200 into multiple smaller currents when it flows into relay 100, thereby reducing the inter-contact Hom force F4, while maintaining the same short-circuit resistance, that is, when the current in output circuit 200 remains unchanged, the short-circuit current between the contacts is reduced due to the shunting, and the inter-contact Hom force F4 is correspondingly reduced. This can reduce the driving force required for the movable reed 21, that is, the contact pressure F1 requirement, thereby reducing the number of turns of coil 332 in relay 100 and lowering manufacturing costs. Conversely, when the number of turns of coil 332 in relay 100 remains unchanged, that is, when the driving force on movable reed 21 remains unchanged, the inter-contact Hom force F4 that can be resisted remains unchanged, while the short-circuit current between the contacts is reduced due to the shunting, thereby increasing the current in output circuit 200 and thus improving the short-circuit resistance of relay 100.

[0036] The term "plurality" can be understood as two, three, four or more, that is, the number of the movable spring piece 21, the movable spring lead piece 22, the flexible conductive member 23, the static spring piece 24 and the static spring lead piece 25 can each be two, three, four or more. Figures 1 to 3The figure schematically illustrates only the case where the number of each of the movable spring piece 21, movable spring lead piece 22, flexible conductive member 23, static spring piece 24, and static spring lead piece 25 is two. It will be appreciated that when each of the two components is two, the current in the output circuit 200 is split in half when flowing through the relay 100, and the inter-contact Holm force F4 is correspondingly reduced by half. The required dynamic net force is also reduced by half, meaning the required driving force of the relay coil 332 is reduced by half. Therefore, the number of turns of the coil 332 in the relay 100 can be reduced to √2 / 2 times the original value, significantly reducing manufacturing costs. Furthermore, if the number of turns of the coil 332 in the relay 100 remains unchanged, meaning the driving power consumption of the relay coil 332 remains unchanged, the short-circuit current can be increased to √2 times the original value.

[0037] When the static spring is energized, the currents on the static spring piece 24 and the static spring lead piece 25 are in opposite directions. The currents in opposite directions repel each other, causing the static spring piece 24 to have an electromotive force F2 moving toward the moving spring piece 21. The electromotive force F2 can resist the Holm force F4 between the contacts, further improving the short-circuit resistance of the relay 100.

[0038] In other embodiments, the static spring lead-out piece 25 may not be required. The static spring piece 24 is inserted into the base 1, with the upper end of the static spring piece 24 located above the base 1. The upper end of the static spring piece 24 is provided with a static contact 240, and the lower end of the static spring piece 24 is located below the base 1. During use, the lower ends of multiple static spring pieces 24 are connected in parallel to the second interface 201 of the output circuit 200. The large current in the output circuit 200 is divided into multiple small currents when passing through the multiple dynamic spring lead-out pieces 22. The current then flows to the static spring piece 24 through the flexible conductive member 23 and the dynamic spring piece 21.

[0039] See also Figures 5 to 9 In this embodiment, the flexible conductive member 23 is disposed between the movable spring piece 21 and the movable spring lead piece 22. One end of the flexible conductive member 23 is connected to the movable contact 210 on the movable spring piece 21, and the other end of the flexible conductive member 23 is connected to the movable spring lead piece 22. When the relay 100 is energized, the current on the movable spring lead piece 22 can flow directly to the movable contact 210 and then to the stationary spring portion, shortening the current flow path in the relay 100 and reducing heat loss. In other embodiments, the flexible conductive member 23 is connected to the movable spring piece 21 and is separated from the movable contact 210. In other embodiments, the flexible conductive member 23 is connected to the portion of the movable spring piece 21 that is not located at the movable contact 210.

[0040] In this embodiment, the flexible conductive member 23 is a wire braid formed by weaving a plurality of wires. The wires can be copper wires, which have good conductivity and are relatively low in cost. The wire braid includes a first section 231, a second section 232, and a third section 233 that are continuously bent. Since the wire braid is woven from a plurality of flexible wires, the wires forming the first section 231, the second section 232, and the third section 233 can be a sheet-like structure or a band-like structure, both of which can maintain good flexibility. The first section 231 is closely connected to the movable contact 210. The first section 231 and the movable contact 210 have a larger connection area, making the connection more secure and reducing heat loss. The third section 233 is closely connected to the movable spring lead-out piece 22. The third section 233 and the movable spring lead-out piece 22 have a larger connection area, making the connection more secure and reducing heat loss. The first section 231 and the third section 233 can open or close relative to the second section 232 to adapt to the movement of the dynamic spring 21, and the wire braid made of wire has good flexibility and does not generate reaction force when opening or closing, so there is no need to increase the driving force of the coil 332.

[0041] In other embodiments, the flexible conductive member 23 is a metal conductive sheet, which can be a copper sheet, which has good conductivity and is relatively low in cost. The metal conductive sheet includes a first segment 231, a second segment 232, and a third segment 233, each of which is continuously bent. The first segment 231, the second segment 232, and the third segment 233 can all be pressed into a sheet-like structure from metal, thereby providing the metal conductive sheet with good flexibility. The first segment 231 is closely connected to the movable contact 210, and the connection area between the first segment 231 and the movable contact 210 is larger, making the connection more secure and reducing heat loss. The third segment 233 is closely connected to the movable spring lead-out piece 22, and the connection area between the third segment 233 and the movable spring lead-out piece 22 is larger, making the connection more secure and reducing heat loss. The first segment 231 and the third segment 233 can open or close relative to the second segment 232 to accommodate the movement of the movable spring 21. Although the reaction force generated by the deformation of the metal conductive sheet needs to be overcome when opening, the driving force of the coil 332 is sufficient to enable the movable spring piece 21 to overcome the reaction force and move toward the side close to the static spring piece 24.

[0042] In this embodiment, the first section 231, the second section 232, and the third section 233 are continuously bent in a U-shape. In other embodiments, the first section 231, the second section 232, and the third section 233 may also be bent in a Z-shape. However, bending the first section 231, the second section 232, and the third section 233 in a U-shape allows the upper end of the movable spring lead 22 to be roughly aligned with the movable contact 210 at the lower end of the movable spring 21, resulting in a more compact layout and more efficient use of space within the relay 100.

[0043] Still see Figures 5 to 8In this embodiment, the movable spring 21 is continuously bent in a "Z" shape. Specifically, the movable spring 21 includes a first segment 211, a second segment 212 and a third segment 213. The upper end of the first segment 211 serves as the driving end of the movable spring 21, and the movable spring 21 is driven to move by the driving end. The second segment 212 is formed by bending the lower end of the first segment 211 backward. The third segment 213 is formed by bending the end of the second segment 212 away from the first segment 211 downward. The moving contact 210 is provided at the lower end of the third segment 213. The flexible conductive member 23, which is continuously bent in a "U" shape, is located below the second segment 212. The movable spring 21 avoids the installation space of the flexible conductive member 23 by continuously bending in a "Z" shape.

[0044] Continue reading Figures 5 to 8 In this embodiment, the static spring 24 is flat, making its manufacture simpler. The static spring 24 extends generally vertically. The static spring lead 25 comprises a mounting section 251, a bent section 252, and a connection section 253. The mounting section 251 is located above the base 1 and parallel to the static spring 24. The upper end of the static spring 24 is affixed to the mounting section 251, providing a more secure connection between the static spring 24 and the mounting section 251. The bent section 252 is formed by bending the lower end of the mounting section 251 backward and diagonally downward. A gap is formed between the bent section 252 and the lower end of the static spring 24 to allow the flat static spring 24 to deform. It should be noted that although the dynamic spring 21 is continuously bent in a "Z" shape, it is manufactured as a rigid body to prevent it from being repelled by the Holm force F4 between the contacts. The clearance between the lower end of the static spring 24 and the bent section 252 allows the static spring 24 to deform when the movable contact 210 contacts the static contact 240, providing the static spring 24 with a certain elastic force, thereby ensuring contact reliability between the movable contact 210 and the static contact 240. Furthermore, when the rigid movable spring 21 drives the movable contact 210 into contact with the static contact 240 on the elastic static spring 24, the movable contact 210 rubs against the static contact 240, thereby damaging the film layer on the contacts and improving the contact resistance.

[0045] The lead section 253 extends vertically and is formed by bending the lower end of the bent section 252 downward. The lead section 253 is inserted into the base 1, with the upper end of the lead section 253 located above the base 1 and the lower end of the lead section 253 located below the base 1. The lower end of the lead section 253 is used to connect to the second interface 201 of the output circuit 200.

[0046] In this embodiment, the static reed 24 is configured to have an initial pressure F3 moving toward the movable reed 21 . The initial pressure F3 can resist the Holm force F4 between the contacts, further improving the short-circuit resistance of the relay 100 .

[0047] See also Figure 3In this embodiment, the relay 100 further includes a limit block 4. A slot 11 is provided on the base 1, and the slot 11 is provided at the lower end of the static contact spring 24. The limit block 4 is inserted into the slot 11 to facilitate the installation of the limit block 4. The static spring 24 elastically presses against the limit block 4 so that the static spring 24 is configured to be elastically bent toward the side away from the dynamic spring 21. The static spring 24 generates elasticity due to deformation, forming a certain pre-pressure. The limit block 4 can be made of metal material. The metal material has the characteristic of not being easy to melt, which can prevent the high temperature generated when a short-circuit circuit flows through the static spring 24 from causing the limit block 4 to melt. In other embodiments, the limit block 4 can also be a plastic part protruding from the top surface of the base 1. The limit block 4 and the base 1 can be integrally formed, so that there is no need to have a slot 11 on the base 1.

[0048] See also Figure 1 and Figure 2 The drive group 3 is disposed in the housing and is used to apply external force to drive the movable spring 21 to automatically move, thereby closing the movable contact 210 and the static contact 240 to connect the output circuit 200 and realize automatic control of the output circuit 200. The drive group 3 includes an armature 31, a reset spring 32, a coil assembly 33, and a yoke 34.

[0049] The armature 31 is roughly "L"-shaped. The armature 31 is movably arranged above the base 1 and is connected to multiple movable springs 21 through a push card 35. When the armature 31 moves, it can drive the multiple movable springs 21 to move simultaneously, so that the multiple movable contacts 210 and the multiple static contacts 240 are closed or separated at the same time.

[0050] The return spring 32 has an elastic force that acts on the armature 31. The return spring 32 uses its own elastic force to move the armature 31, automatically and simultaneously separating the multiple movable contacts 210 from the multiple stationary contacts 240. When an external force is applied to the armature 31, the armature 31 overcomes the elastic force of the return spring 32 and moves, closing the movable contacts 210 and the stationary contacts 240.

[0051] The coil assembly 33 is disposed above the base 1. The magnetic field generated by the coil assembly 33 is used to drive the armature 31 to overcome the elastic force of the reset spring 32, so that the armature 31 drives the reset spring 32 to automatically move above the base 1, thereby driving the multiple moving contacts 210 and the multiple static contacts 240 to automatically close simultaneously. At this time, there is a contact pressure F1 between the contacts, which can resist the Holm force F4 between the contacts when a short-circuit current is generated.

[0052] The coil assembly 33 includes a coil frame and a coil 332. The coil frame includes a winding post (not shown) and lower and upper mounting seats 3311 and 3312 located at each end of the winding post. The lower mounting seat 3311 is fixed to the top surface of the base 1, the winding post stands upright above the lower mounting seat 3311, and the upper mounting seat 3312 is located at the upper end of the winding post. The coil 332 is wound around the winding post. The coil assembly 333 also has two terminals 3321. The ends of the enameled wire forming the coil 332 are fixed to the two terminals 3321 and electrically connected to the terminals 3321. The lower ends of the terminals 3321 extend out of the base 1 and are respectively used to connect to the input circuit. When power is applied to the coil 332, a magnetic field is generated around it. A vertically extending iron core is inserted into the winding post to amplify the magnetic field generated by the coil 332. The magnetic attraction generated by the magnetic field of the coil 332 on the armature 31 can drive the armature 31 to overcome the elastic force of the reset spring 32, causing the armature 31 to drive the multiple movable springs 21 to move synchronously, thereby closing the multiple movable contacts 210 and the multiple stationary contacts 240. When the coil 332 is de-energized, the coil 332 no longer generates a magnetic field, and the magnetic attraction on the armature 31 disappears. The armature 31 and the movable spring 21 move synchronously under the elastic force of the reset spring 32, causing the multiple movable contacts 210 and the multiple stationary contacts 240 to separate. In other words, the coil assembly 33 can cooperate with the armature 31 and the reset spring 32 to switch the on / off state of the contact assembly 2.

[0053] The yoke 34 is located above the base 1 and includes an L-shaped vertical section and a horizontal section. The vertical section stands upright on the rear side of the coil frame and is parallel to the axis of the winding rod. The armature 31 is movably mounted on the upper end of the vertical section of the yoke 34. The horizontal section is arranged horizontally and inserted into the lower mounting seat 3311 and supported on the lower end of the iron core. The yoke 34 acts as a magnetic conductor. When the coil 332 is first energized, the gap between the armature 31 and the iron core is large, the magnetic resistance is large, and the magnetic attraction is small. However, as long as the magnetic attraction is greater than the reaction force of the reset spring 32, the armature 31 can move toward the iron core and approach it. As the distance between the armature 31 and the iron core decreases, the magnetic resistance also decreases, and the magnetic attraction increases. Eventually, the armature 31 contacts the iron core, causing the magnetic field generated by the coil 332 to form a closed loop through the yoke 34, the iron core, and the armature 31.

[0054] See also Figure 9 and Figure 10The forces acting between the contacts will be described below in conjunction with the above-described embodiments. When the movable contact 210 and the stationary contact 240 in the relay 100 are in the closed state, and the switch 203 in the output circuit 200 is in the open state, the magnetic field generated by the energization of the coil assembly 33 exerts a driving force on the armature 31, causing the armature 31 to overcome the elastic force of the return spring 32. The armature 31 then drives the movable contact 210 and the stationary contact 240 to close, generating a contact pressure F1 between the contacts. Subsequently, when the switch 203 in the output circuit 200 is closed, the current in the output circuit 200 is split into a small current by the movable spring lead 22. The current then flows sequentially through the flexible conductive member 23, the movable spring 21, the movable contact 210, the stationary contact 240, the stationary spring 24, and the stationary spring lead 25. Because the currents in the stationary spring 24 and the stationary spring lead 25 flow in opposite directions, the oppositely directed currents repel each other, causing the stationary spring 24 to generate an electromotive force F2 that moves toward the movable spring 21. Therefore, at this point, the contact pressure F1 and the electromotive force F2 jointly resist the Holm force F4 between the contacts during a short circuit. That is, the requirement for the contacts to withstand short-circuit currents is F1 + F2 ≥ F4. The design of shunting the current flowing from the output circuit 200 into the relay 100 significantly reduces the Holm force F4 between the contacts. Since both the Holm force F4 and the electromotive force F2 are proportional to the square of the output circuit current I, the current shunting to 1 / 2I in this example is equivalent to reducing both the Holm force F4 and the electromotive force F2 by 1 / 4. This means that the contact pressure F1 on a single contact can also be reduced by 1 / 4, and the contact pressure required for both contacts can be reduced by 1 / 2, effectively improving the short-circuit resistance of the relay 100.

[0055] See also Figure 8 and 11 When the moving contact 210 and the stationary contact 240 in the relay 100 are separated and the switch 203 in the output circuit 200 is closed, there is no contact pressure F1 because the moving contact 210 and the stationary contact 240 are not closed. Since the stationary spring 24 is configured to bend elastically away from the moving spring 21 and elastically abut against the stopper 4, the stationary spring 24 experiences an initial pressure F3 that moves it toward the moving spring 21. Subsequently, when the moving contact 210 and the stationary contact 240 are closed, at the moment of closing, the moving contact 210 and the stationary contact 240 just make contact, and no contact pressure F1 is generated. However, due to the current flowing through the stationary spring 24 and the stationary spring lead 25, the stationary spring 24 experiences an electric force F2 that moves it toward the moving spring 21. Therefore, the initial pressure F3 and the electromotive force F2 work together to counteract the Holm force F4 between the contacts during a short circuit. This means that the contact's ability to withstand short-circuit currents requires F2 + F3 ≥ F4. Therefore, if the contacts lack the initial pressure F3 and electromotive force F2 to compensate, the high short-circuit current flowing through them at the moment the moving contact 210 and the stationary contact 240 close will cause them to open.

[0056] From the above analysis, it can be seen that the ability of the relay 100 to withstand circuit current can be greatly improved based on the design that reduces the current flowing from the output circuit 200 into the relay 100, the design that makes the current directions on the static reed piece 24 and the static reed lead piece 25 opposite, and the design that provides an initial pressure F3 on the static reed piece 24.

[0057] Although the present invention has been particularly shown and described in conjunction with preferred embodiments, it should be understood by those skilled in the art that various changes in form and details made to the present invention without departing from the spirit and scope of the invention as defined in the appended claims fall within the scope of protection of the present invention.

Claims

1. A relay, characterized in that: It includes a dynamic spring part, a static spring part and a driving group. The dynamic spring part includes multiple dynamic spring pieces, each of which is provided with a dynamic contact, and dynamic spring lead-out pieces connected to the dynamic spring pieces through flexible conductive parts. The dynamic spring lead-out pieces are used to be inserted into the base of the relay. The flexible conductive parts adapt to the movement of the dynamic spring pieces. The static spring part includes multiple static spring pieces, each of which is provided with a static contact. The dynamic spring part is connected in parallel to the first interface of the output circuit through the dynamic spring lead-out pieces, and the static spring part is connected in parallel to the second interface of the output circuit through the multiple static spring pieces. The driving group drives the multiple dynamic spring pieces to move simultaneously, so that the multiple dynamic contacts contact the multiple static contacts at the same time, and each pair of contacting dynamic contacts and static contacts is in an independent parallel shunt circuit to shunt the current flowing into the relay from the output circuit.

2. The relay according to claim 1, wherein The flexible conductive member is provided between the movable spring piece and the movable spring lead-out piece, one end of the flexible conductive member is connected to the movable contact on the movable spring piece, and the other end of the flexible conductive member is connected to the movable spring lead-out piece.

3. The relay according to claim 2, wherein: The flexible conductive member is a wire braided body formed by weaving multiple wires or the flexible conductive member is a metal conductive sheet. The flexible conductive member includes a first section, a second section and a third section that are continuously bent. The first section is adhered to the moving contact, and the third section is adhered to the dynamic spring lead-out piece. The first section and the third section can open or close relative to the second section to adapt to the movement of the dynamic spring piece.

4. The relay according to claim 1, wherein: The static spring portion further includes a plurality of static spring lead-out pieces connected to the static spring piece, the static spring piece being arranged between the static spring lead-out piece and the dynamic spring piece, the static spring portion being connected in parallel to the second interface of the output circuit through the plurality of static spring lead-out pieces, and when the static spring portion is energized, the current directions on the static spring piece and the static spring lead-out piece are opposite, so that the static spring piece has an electric force moving toward the side of the dynamic spring piece, and the electric force can resist the Holm force between the contacts.

5. The relay according to claim 4, wherein: The static spring piece is in the shape of a flat piece, and the static spring lead-out piece includes a bent section. A movable gap is formed between the bent section and the static spring piece for the static spring piece to deform.

6. The relay according to claim 1, wherein: The static reed is configured to have an initial pressure to move toward one side of the movable reed, and the initial pressure can resist the Holm force between the contacts.

7. The relay according to claim 6, wherein: The relay also includes a base and a limit block. The base is provided with a slot, and the slot is provided at the lower end of the static spring. The limit block is inserted into the slot. The static spring elastically presses against the limit block so that the static spring has an initial pressure to move toward the side of the dynamic spring. The dynamic spring is manufactured as a rigid body, and the static spring is elastic. The static spring lead-out piece and the dynamic spring lead-out piece are respectively inserted into the base.

8. The relay according to claim 1, wherein: The movable spring piece is continuously bent in a "Z" shape.

9. The relay according to claim 1, wherein: The driving group includes an armature, a push card and a coil. The armature is connected to multiple movable springs through the push card. The coil is used to drive the armature to drive multiple movable springs to move simultaneously, so that multiple movable contacts contact multiple static contacts at the same time.

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