A relay with an external terminal

Abstract

The utility model discloses a kind of relays containing external terminals, including base, yoke, coil, base is provided with static contact, yoke is provided with armature assembly, armature assembly is provided with and static contact disconnects or the moving contact of closure;Base is provided with the external terminal of fixed connection in the base, external terminal includes two left and right symmetrical external terminal units, external terminal unit includes the first part in shell and the second part in shell outside, the first part is provided with and the plug-in terminal of PCB board welding, second part and external wire bolt connection or resistance welding connection.The problem of relay terminal and load loop connection is solved by adopting the above structure, the relay terminal can be welded and can be used bolt external, ensure that the external terminal of relay has stronger torsional strength, and will not affect the parameter of relay in the process of being connected with external wire, greatly increase the reliability of use.

Description

Technical Field

[0001] This utility model relates to a relay with external terminals, and more particularly to a reliable relay with external terminals. Background Technology

[0002] Currently, most power relays connect to the load circuit by soldering leads to terminals on a PCB board. With the upgrading of relays, the current they can carry is increasing. High current passing through the PCB load circuit generates significant heat, greatly reducing safety and reliability. This places higher demands on the current-carrying design of the PCB board. At the same time, the increased cross-sectional area of ​​the copper foil also significantly increases costs.

[0003] When carrying high currents on a PCB, a large copper foil current-carrying area is required, leading to high costs. The wider current-carrying loop also increases the PCB area, hindering the miniaturization of the entire device. High currents are typically accompanied by significant heat generation; excessive heat can cause aging and failure, and trigger current-limiting mechanisms, preventing the device from reaching its full power potential. Higher currents also require larger cross-sectional areas for connectors, posing a challenge for wave soldering. Too low a soldering temperature prevents effective soldering of relay terminals, while too high a temperature can affect the reliability of surrounding components and potentially cause failure.

[0004] In view of the above problems, this utility model urgently needs to provide a reliable relay. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a relay with external terminals, which has the characteristics of reliable use.

[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows: a relay with external terminals, the innovation of which is that the relay with external terminals includes a base, a yoke disposed above the base and fixedly connected to the base, a coil disposed on the base, a stationary contact disposed on the base, an armature assembly disposed on the yoke, a moving contact disposed on the armature assembly that is disconnected or closed with the stationary contact, and a housing covering the yoke and the base.

[0007] The base is provided with external terminals fixedly connected to the base. The external terminals include two external terminal units that are symmetrically arranged on the left and right. Each external terminal unit includes a first part located inside the housing and a second part located outside the housing. The first part is provided with plug terminals that are soldered to the PCB board, and the second part is connected to the external wire by bolting or resistance welding.

[0008] Preferably, when the second part is resistance welded to the external wire, the base is provided with a reinforcing rib that abuts against the first part, and the reinforcing rib is located on the end of the first part near the second part.

[0009] Preferably, the second part is arranged at an angle to the first part, and the included angle between the second part and the first part is 120-150°.

[0010] Preferably, when the second part is bolted to the external wire, the first part is the contact surface and the second part is the locking surface, and the first part and the second part are arranged in parallel.

[0011] Preferably, the first part and the second part are on the same plane.

[0012] Preferably, a third part is provided between the first part and the second part to connect the two, the third part is provided perpendicular to the first part and the second part, and the third part is provided to fit the corresponding outer shell surface.

[0013] Preferably, the second part is provided with a self-locking nut, which is screwed onto the external wire bolt when the external wire is bolted.

[0014] Preferably, the base is provided with an auxiliary monitoring circuit, including a first upright and a second upright on the base, a monitoring spring piece with one end fixedly connected to the first upright, an auxiliary moving contact on the end of the monitoring spring piece away from the first upright, and an auxiliary stationary contact on the second upright piece that is open or closed with the auxiliary moving contact; the armature assembly is provided with a stop block that abuts against the monitoring spring piece.

[0015] Preferably, the stop is an insulating pusher.

[0016] The advantages of this utility model are: by adopting the above structure, the problem of connecting the relay terminal and the load circuit is solved. The relay terminal can be welded or externally connected with bolts, ensuring that the external terminal of the relay has strong anti-torsion ability, and the parameters of the relay will not be affected during the connection with the external wire, which greatly increases the reliability of use. Attached Figure Description

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0018] Figure 1 This is a perspective view of a relay (excluding the housing) with external terminals according to this utility model.

[0019] Figure 2 This is a schematic diagram of the structure of a relay with external terminals (excluding the housing) according to this utility model.

[0020] Figure 3 This is a schematic diagram of the structure of a relay with external terminals according to this utility model.

[0021] Figure 4 This is a schematic diagram of the structure of a relay with external terminals using resistance welding according to this utility model.

[0022] Figure 5 This is a partial structural diagram of a relay with external terminals according to the present invention, which is constructed using resistance welding.

[0023] Figure 6 This is a schematic diagram of the first type of relay with external terminals using a bolt connection method according to this utility model.

[0024] Figure 7 This is a schematic diagram of the structure of the external terminal in the first form of the relay with external terminals of this utility model, which adopts a bolt connection method.

[0025] Figure 8 This is a schematic diagram of the second form of the relay with external terminals using a bolt connection method according to this utility model.

[0026] Figure 9 This is a schematic diagram of the structure of the external terminal in the second form of the relay with external terminals of this utility model, which adopts a bolt connection method.

[0027] Figure 10 This is a schematic diagram of the third type of relay with external terminals using a bolt connection method according to this utility model.

[0028] Figure 11 This is a schematic diagram of the structure of the external terminal in the third form of the relay with external terminals according to the present invention, which adopts a bolt connection method.

[0029] In the diagram: 1-Base, 2-Yoke, 3-Coil, 4-Stationary contact, 5-Armature assembly, 6-Moving contact, 7-Housing, 81-First part, 82-Second part, 83-Plug-in terminal, 84-Third part, 9-Reinforcing rib, 10-Self-locking nut, 11-First upright, 12-Second upright, 13-Monitoring spring, 14-Auxiliary moving contact, 15-Auxiliary stationary contact, 16-Stop. Detailed Implementation

[0030] This utility model discloses a relay with external terminals, comprising a base 1, a yoke 2 fixedly connected to and positioned above the base 1, a coil 3 mounted on the base 1, a stationary contact 4 on the base 1, an armature assembly 5 on the yoke 2, and a moving contact 6 on the armature assembly 5 that can be opened or closed with the stationary contact 4. The relay is covered by a housing 7 that encloses the yoke 2 and the base 1. External terminals are fixedly connected to the base 1, comprising two symmetrically positioned external terminal units. Each external terminal unit includes a first part 81 located inside the housing 7 and a second part 82 located outside the housing 7. The first part 81 has a plug-in terminal 83 soldered to a PCB board, and the second part 82 is connected to an external wire by bolting or resistance welding. This structure solves the problem of connecting the relay terminals to the load circuit. The relay terminals can be soldered or bolted externally, ensuring strong torsional resistance and preventing any impact on relay parameters during connection to external wires, thus significantly increasing reliability.

[0031] The relay's external terminals and external wires are connected together by bolts or resistance welding, which means that they need to withstand a certain amount of pressure or torque during installation. These external forces will be transmitted to the inside of the relay, which may cause the terminals to deform or the parameters to change, leading to abnormal operation of the relay.

[0032] like Figure 4 and Figure 5 As shown, when the second part 82 is resistance welded to the external wire, a reinforcing rib 9 is provided on the base 1 to abut against the first part 81. The reinforcing rib 9 is located on the first part 81 near the end of the second part 82. The second part 82 and the first part 81 are arranged at an angle, with an included angle of 120-150°. When the external wire and the external terminal are connected by resistance welding, the force applied to the relay terminal by the external connection can easily be transmitted to the inside of the relay, accompanied by high temperature, which can easily cause deformation and melting of the plastic parts. Therefore, in the area near the exposed surface of the housing 7, the connector terminal is fixed to the PCB board by welding, ensuring that a large part of the external force is offset here. At the same time, the reinforcing rib 9 is used to locally strengthen the structure, so that it can withstand the pressure of external forces without deformation.

[0033] When external wires and terminals are connected using bolt fastening, a significant torque is generated, which is transmitted to the relay's external terminals. This can cause minor issues like terminal deformation, or more serious problems like changes in relay parameters, rendering the relay malfunction. By soldering the external terminals, where the contact surfaces are located, to the PCB board, the contact surfaces acquire a certain degree of torsional resistance.

[0034] like Figure 6 and Figure 7As shown, when the second part 82 is bolted to the external wire, the first part 81 is the contact surface and the second part 82 is the locking surface. The first part 81 and the second part 82 are arranged in parallel and are on the same plane. When the locking surface and the contact surface are on the same plane, the torque transmission force is located on the plane where the external terminal is located, which can maximize the torsional resistance of the external terminal.

[0035] like Figure 8 and Figure 9 As shown, a third part 84 is provided between the first part 81 and the second part 82 to connect the two. The third part 84 is set perpendicular to the first part 81 and the second part 82 respectively, and the third part 84 is attached to the surface of the corresponding housing 7. The locking surface and the contact surface are parallel, and the torque transmission force is parallel to the thickness direction of the terminal, which can also significantly improve the torsional resistance of the terminal and ensure the reliability of the relay after installation.

[0036] To further enhance self-locking capabilities, such as Figure 10 and Figure 11 As shown, a self-locking nut 10 is provided on the second part 82. When the external wire is bolted, the bolt is screwed into the self-locking nut 10.

[0037] An auxiliary monitoring circuit is provided on the base 1, including a first upright 11 and a second upright 12 provided on the base 1, a monitoring spring 13 with one end fixedly connected to the first upright 11, an auxiliary moving contact 14 provided on the end of the monitoring spring 13 away from the first upright 11, and an auxiliary stationary contact 15 provided on the second upright 12 that is open or closed with the auxiliary moving contact 14; a stop block 16 is provided on the armature assembly 5 to abut against the monitoring spring 13, and the stop block 16 is an insulating push plate.

[0038] The auxiliary monitoring circuit functions to realize the on / off and detection functions of the main load circuit. Under normal operation, when coil 3 is energized, the main load contact is closed and the monitoring contact is open; when coil 3 is de-energized, the main load is disconnected and the monitoring contact is closed. When the main load fails to bond, coil 3 is de-energized, the main load is in a closed state due to bonding, the monitoring terminal contact is open, and the monitoring circuit is not conductive.

[0039] like Figure 3As shown, when coil 3 is de-energized, moving contact 6 is in an open state due to the restoring force of armature assembly 5, while auxiliary moving contact 14 is kept closed by the restoring force of moving monitoring spring 13. When coil 3 is energized, armature assembly 5 is attracted by magnetic attraction, and rotates against the force of armature assembly 5, causing moving contact 6 to close and pushing monitoring spring 13 to open the closed monitoring contact. When moving contact 6 and stationary contact 4 become stuck together and fail, coil 3 is de-energized, and the stuck moving contact 6 on armature assembly 5 is restrained and cannot return to its initial position; the insulating pusher always remains in the state of pushing monitoring spring 13 open, the monitoring circuit cannot close, and the detection system judges that moving contact 6 has become stuck. The auxiliary monitoring circuit and the main contacts (moving contact 6 and stationary contact 4) are linked through armature assembly 5.

[0040] With the upgrading and replacement of industrial products, increasing emphasis is placed on safety performance, making safety detection modules indispensable. The demand for main circuit switch adhesion detection has become widespread. Integrating the auxiliary detection circuit with the main switch circuit into a single relay reduces costs and improves reliability, becoming the current mainstream trend.

[0041] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details.

Claims

1. A relay with external terminals, characterized in that: The relay with external terminals includes a base, a yoke disposed above the base and fixedly connected to the base, and a coil disposed on the base. A stationary contact is disposed on the base, an armature assembly is disposed on the yoke, a moving contact is disposed on the armature assembly and can be disconnected or closed with the stationary contact, and a housing is disposed on the relay covering the yoke and the base. The base is provided with external terminals fixedly connected to the base. The external terminals include two external terminal units that are symmetrically arranged on the left and right. Each external terminal unit includes a first part located inside the housing and a second part located outside the housing. The first part is provided with plug terminals that are soldered to the PCB board, and the second part is connected to the external wire by bolting or resistance welding.

2. A relay with external terminals as described in claim 1, characterized in that: When the second part is resistance welded to the external wire, the base is provided with a reinforcing rib that abuts against the first part, and the reinforcing rib is located on the end of the first part near the second part.

3. A relay with external terminals as described in claim 2, characterized in that: The second part is inclined to intersect the first part, and the included angle between the second part and the first part is 120-150°.

4. A relay with external terminals as described in claim 1, characterized in that: When the second part is bolted to the external wire, the first part is the contact surface and the second part is the locking surface, and the first part and the second part are arranged in parallel.

5. A relay with external terminals as described in claim 4, characterized in that: The first part and the second part are on the same plane.

6. A relay with external terminals as described in claim 4, characterized in that: A third part is provided between the first part and the second part to connect the two. The third part is arranged perpendicular to the first part and the second part and is fitted to the corresponding outer shell surface.

7. A relay with external terminals as described in claim 6, characterized in that: The second part is provided with a self-locking nut, which is screwed into the external wire bolt when the external wire is bolted.

8. A relay with external terminals as described in claim 1, characterized in that: An auxiliary monitoring circuit is provided on the base, including a first upright and a second upright on the base, and a monitoring spring piece with one end fixedly connected to the first upright. An auxiliary moving contact is provided on the end of the monitoring spring piece away from the first upright. An auxiliary stationary contact is provided on the second upright that is open or closed with the auxiliary moving contact. A stop block is provided on the armature assembly to abut against the monitoring spring piece.

9. A relay with external terminals as described in claim 8, characterized in that: The stop block is an insulating push plate.

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