Electromagnetic relay

Abstract

The utility model discloses an electromagnetic relay, which comprises a shell and a relay circuit arranged in the shell, the shell is made of polyamide and comprises a shell body and a cover body, and the shell body and the cover body are connected and fixed in a buckling mode; the relay circuit comprises a relay element and a peripheral driving circuit connected with the relay element; the relay element is sealed and packaged by adopting a metal shell fusion welding mode; the peripheral drive circuit comprises a protection circuit and a rectification circuit, the AC side of the rectification circuit and the protection circuit are connected in parallel at two ends of an external power supply, and the DC side of the rectification circuit is connected in parallel with the relay element. The electromagnetic relay has the characteristics of salt spray resistance and corrosion resistance, and the shell is high in strength, good in toughness, impact-resistant and good in insulativity. Relay elements are sealed and packaged in a metal shell fusion welding mode, and the overall reliability is improved.

Description

Technical Field

[0001] This utility model relates to the field of relays, and in particular to an electromagnetic relay. Background Technology

[0002] For existing emergency diesel engine control systems, the electromagnetic relays need to meet the requirements for vibration and shock resistance, contact corrosion resistance, and relay oxidation resistance, and the protection level indicators have corresponding requirements.

[0003] Existing relays used in emergency diesel engine control systems cannot adequately meet the on-site requirements of nuclear power plant overhauls due to their contact materials and relay structure. They suffer from high failure rates, failures affecting the starting of emergency diesel engines and the execution of nuclear safety functions, or high manufacturing and after-sales costs, making them unsuitable for large-scale use. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide an electromagnetic relay.

[0005] The technical solution adopted by this utility model to solve its technical problem is: to construct an electromagnetic relay, including a housing and a relay circuit disposed in the housing;

[0006] The outer shell is made of polyamide; the outer shell includes a shell and a cover, which are connected and fixed by a snap-fit ​​mechanism;

[0007] The relay circuit includes a relay element and an external drive circuit connected to the relay element; the relay element is sealed and encapsulated by metal shell welding; the external drive circuit includes a protection circuit and a rectifier circuit, the AC side of the rectifier circuit and the protection circuit are connected in parallel across the two ends of an external power supply, and the DC side of the rectifier circuit is connected in parallel with the relay element.

[0008] Preferably, in the electromagnetic relay constructed according to this invention, the polyamide includes modified nylon PA66.

[0009] Preferably, in the electromagnetic relay constructed according to this utility model, the protection circuit includes a varistor connected to both ends of the external power supply.

[0010] Preferably, in the electromagnetic relay constructed according to this utility model, the rectifier circuit includes a bridge rectifier circuit, which includes an AC terminal and a DC terminal.

[0011] The AC terminals are connected in parallel across the two ends of the external power supply;

[0012] The DC terminal is connected in parallel across the coil of the relay element.

[0013] Preferably, in the electromagnetic relay constructed in this invention, at least one first resistor is connected in series at the AC terminal of the bridge rectifier circuit.

[0014] Preferably, in the electromagnetic relay constructed in this utility model, the peripheral driving circuit further includes an indicator circuit connected in parallel across the DC side of the rectifier circuit.

[0015] The indicator circuit includes a second resistor and a light-emitting diode connected in series.

[0016] Preferably, in the electromagnetic relay constructed according to this invention, the package of the relay element is filled with an inert gas.

[0017] Preferably, in the electromagnetic relay constructed according to this utility model, the relay element includes a coil, an armature, a contact, and a current-conducting spring.

[0018] The two ends of the coil are connected in parallel to the two ends of the rectifier circuit. When the coil is energized, the armature is magnetically attracted and located in a first position close to the coil. When the coil is de-energized, the armature is located in a second position far away from the coil.

[0019] The contact is connected to the guide spring. When the armature is in the first position, it is electrically connected to the contact through the guide spring. When the armature is in the second position, it is separated from the guide spring.

[0020] Preferably, in the electromagnetic relay constructed in this utility model, the interior of the relay element package corresponding to the position of the contact is filled with inert gas;

[0021] And / or, the material of the contact and the flow guide spring is silver-magnesium-nickel.

[0022] Preferably, in the electromagnetic relay constructed according to this utility model, the relay element includes a terminal block, and the terminal block includes a spring-press type terminal block;

[0023] And / or, the relay element includes two sets of changeover contacts connected in series.

[0024] By implementing this utility model, the following beneficial effects can be achieved:

[0025] This utility model discloses an electromagnetic relay, including a housing and a relay circuit disposed within the housing; the housing is made of polyamide and includes a shell and a cover, which are connected and fixed by a snap-fit ​​method; the relay circuit includes a relay element and an external drive circuit connected to the relay element; the relay element is sealed and encapsulated by metal shell welding; the external drive circuit includes a protection circuit and a rectifier circuit, the AC side of the rectifier circuit and the protection circuit are connected in parallel across the two ends of an external power supply, and the DC side of the rectifier circuit is connected in parallel with the relay element.

[0026] This electromagnetic relay is resistant to salt spray and corrosion, and features a high-strength, tough, and impact-resistant housing with excellent insulation. The relay components are sealed and encapsulated using a metal-shell welding method, increasing overall reliability. Attached Figure Description

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0028] Figure 1 This is a cross-sectional view of the electromagnetic relay in the first embodiment of this utility model;

[0029] Figure 2 This is a circuit diagram of the relay circuit of the electromagnetic relay in the first embodiment of this utility model. Detailed Implementation

[0030] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "upper," "lower," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or component referred to must have a specific orientation; therefore, they should not be construed as limitations on this utility model.

[0031] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. When an component is referred to as being "on" or "below" another component, the component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," "third," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0032] In the following description, specific details such as particular system structures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the present invention. However, those skilled in the art will understand that the present invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

[0033] See Figure 1 and Figure 2 The first embodiment of this utility model discloses an electromagnetic relay, including a housing 1 and a relay circuit 2 disposed within the housing 1; the housing 1 is made of polyamide; the housing 1 includes a shell and a cover, which are connected and fixed by a snap-fit ​​method; the relay circuit 2 includes a relay element K1 and an external driving circuit connected to the relay element K1; the relay element K1 is sealed and encapsulated by metal shell welding; the external driving circuit includes a protection circuit and a rectifier circuit SR1, the AC side of the rectifier circuit SR1 is connected in parallel with the protection circuit across the two ends of an external power supply, and the DC side of the rectifier circuit SR1 is connected in parallel with the relay element K1. The relay circuit 2 is a circuit board; in some embodiments, the relay circuit 2 is a double-sided printed PCB circuit board.

[0034] The external power supply for the electromagnetic relay can be either 24V AC or 48V AC. The relay element K1 is the internal relay, comprising a coil, an iron core housed within the coil, an armature that magnetically engages with the coil based on its energization, a current-guiding spring for contact with the armature, and contacts integrated with the current-guiding spring. The relay element K1 is sealed in a metal casing using a welded metal enclosure, confining the internal contacts within the casing and preventing arcing from escaping. This improves overall safety and extends the electromagnetic relay's lifespan.

[0035] The two ends of the external power supply are the positive terminal E and the negative terminal G, respectively. See also Figure 1 In this embodiment, the relay element's contacts include a first stationary contact D, a second stationary contact C, and a moving contact B, with a current-guiding spring on the moving contact B. Furthermore, in addition to snap-fit ​​connections, the housing and cover can also be stacked and fixed with screws, and a waterproof and heat-resistant sealing ring is placed between the cover and the housing to further enhance the housing's sealing performance.

[0036] Furthermore, in the electromagnetic relay disclosed in this embodiment, the polyamide includes modified nylon PA66. Modified nylon PA66 is a type of polyamide, also known as modified polyamide PA66. It has flame-retardant and fiber-reinforced properties, high rigidity, impact resistance, and vibration resistance. It also possesses excellent dielectric properties, preventing leakage or short circuits in the terminals or internal relay circuit 2 from affecting the overall electromagnetic relay. Moreover, compared to most other polyamide materials, modified nylon PA66 has a higher heat distortion temperature, exceeding 200°C, allowing it to withstand heat generation during operation and exhibiting more stable performance.

[0037] Furthermore, in the electromagnetic relay disclosed in this embodiment, at least one first resistor R1 is connected in series with the AC terminal of the bridge rectifier circuit. The first resistor R1 is used to limit the magnitude of the current flowing into the bridge rectifier circuit. In some embodiments, the operating voltage of the relay element is smaller than the voltage input of the external power supply. After setting the first resistor R1, the voltage across the coil of the relay element in the circuit matches the operating voltage. When there are induced spikes or voltage changes during wiring, the first resistor R1 can act as impedance passivation, reducing the impact of the upstream power supply on the rectifier circuit.

[0038] Furthermore, the circuit schematic of relay circuit 2 can be found in [reference needed]. Figure 2Therefore, in order to absorb surges, suppress voltage spikes, and protect downstream circuits from transient high-voltage interference, the protection circuit in the electromagnetic relay disclosed in this embodiment includes a varistor RV1 connected to both ends of the external power supply. For example, the varistor RV1 can be an LA series surge-protected voltage-sensitive resistor RV1, used to protect the relay element K1 from damage by electrical surge current and voltage. For example, in some embodiments, a varistor RV1 of model V250LA4P and specification P2504 can be used to prevent damage to the circuit from transient high voltage or surge impacts from the external power supply, protect the rectifier circuit SR1, the second resistor R2, and the relay element K1, and improve the anti-interference and withstand voltage capabilities of the relay circuit 2.

[0039] Furthermore, in the electromagnetic relay disclosed in this embodiment, the rectifier circuit SR1 includes a bridge rectifier circuit, which includes an AC terminal and a DC terminal. The AC terminal is connected in parallel across the two ends of the external power supply; the DC terminal is connected in parallel across the two ends of the coil of the relay element K1. The AC input from the external power supply to the AC terminal of the bridge rectifier circuit is converted into a DC output after passing through the bridge rectifier circuit, and then output from the DC terminal of the bridge rectifier circuit to the relay element K1. The bridge rectifier circuit can further be a silicon bridge rectifier, model DF-08, conforming to the QZJ840061 standard.

[0040] Furthermore, in the electromagnetic relay disclosed in this embodiment, the peripheral driving circuit further includes an indicator circuit connected in parallel across the DC side of the rectifier circuit SR1; the indicator circuit includes a second resistor R2 connected in series and a light-emitting diode L1. The indicator circuit and the coil of the relay element K1 are connected in parallel. When the indicator circuit is turned on, the coil of the relay element K1 is also turned on. The light-emitting diode L1 can indicate the working status of the electromagnetic relay, facilitating on-site inspection.

[0041] Preferably, in the electromagnetic relay constructed according to this utility model, the encapsulation of the relay element K1 is filled with inert gas. When the armature and current-guiding spring inside the relay element K1 come into contact with each other, an electric arc will be generated due to motion friction, etc. Filling the encapsulation of the relay element K1 with inert gas helps to reduce contact erosion and extend the service life of the relay element K1.

[0042] Furthermore, in the electromagnetic relay disclosed in this embodiment, the relay element K1 includes a coil, an armature, contacts, and a current-guiding spring. The two ends of the coil are connected in parallel across the rectifier circuit SR1. When the coil is energized, the armature is magnetically attracted and located in a first position close to the coil. When the coil is de-energized, the armature is located in a second position away from the coil. The contacts are connected to the current-guiding spring. When the armature is in the first position, it is electrically connected to the contacts through the current-guiding spring. When the armature is in the second position, it is separated from the current-guiding spring. In some other embodiments, the contacts and the current-guiding spring may also be designed as a non-integrated unit.

[0043] Furthermore, in the electromagnetic relay disclosed in this embodiment, the interior of the relay element K1 package corresponding to the contact position is filled with inert gas. Alternatively, the interior of the relay element K1 package corresponding to the current-guiding spring is filled with inert gas to prevent ablation when the armature is magnetically attracted and slides against the current-guiding spring.

[0044] Furthermore, to better extend the lifespan of the contacts and the current-conducting springs, in the electromagnetic relay disclosed in this embodiment, both the contacts and the current-conducting springs are made of silver-magnesium-nickel alloy. Alternatively, to improve the reliability of the electromagnetic relay, the surface of the current-conducting springs can be plated with gold, which is beneficial for controlling contact resistance.

[0045] Furthermore, in the electromagnetic relay disclosed in this embodiment, the relay element K1 includes a wiring terminal, which includes a spring-press type wiring terminal. The wiring terminal adopts a spring-press type structure, which includes an elastic clamping member and a pressure plate. The elastic clamping member is released when the user presses it, releasing the wire insertion channel, and automatically resets to clamp the wire after the user releases the hand. This structure has the characteristics of quick wiring, good shock resistance, and convenient maintenance, and is suitable for high-density modular connection applications.

[0046] Furthermore, in the electromagnetic relay disclosed in this embodiment, the relay element K1 includes two sets of changeover contacts connected in series. The load voltage of a nuclear power plant is 48Vdc. When the electromagnetic relay itself does not have medium- or high-voltage load capacity, using two sets of changeover contacts in series can improve the contact's ability to interrupt high-voltage load arcs.

[0047] Furthermore, in the electromagnetic relay disclosed in this embodiment, a diode is connected in parallel with the coil of the relay element K1, which can effectively protect the input circuit.

[0048] The second embodiment of this utility model discloses another type of electromagnetic relay. The outer casing 1 of this electromagnetic relay is the same as that of the electromagnetic relay in the first embodiment, but the relay circuit 2 is slightly different from that of the electromagnetic relay in the first embodiment. In the relay circuit 2 of the electromagnetic relay in this embodiment, the input terminal first passes through a 2JT5-2 type coil resistor, and then through a bridge rectifier for rectification. After rectification, the circuit splits into two paths: one path passes through an indicating resistor and a light-emitting diode to return to the negative terminal of the control terminal, and the other path passes through a 2JT5-2 type coil to return to the negative terminal of the control terminal. To prevent the large inrush current generated by lightning from affecting the relay inside the terminal, a varistor for lightning surge protection is connected in parallel at the input and output terminals of the control terminal. The input terminal is connected to an external power supply, while the control terminal is connected to the relay element.

[0049] By implementing this utility model, the following beneficial effects can be achieved:

[0050] 1) The internal relay components are all-metal welded encapsulation, which has good sealing performance and can be used in most environments; the relay components are filled with inert gas, which helps to reduce contact erosion and extend service life; through optimized design, the vibration, shock and centrifugal performance is high.

[0051] 2) The contacts and current-guiding springs are integrated into one piece, made of silver-magnesium-nickel, which has high conductivity and low heat generation. The surface of the springs is gold-plated, which is beneficial for controlling contact resistance and improving reliability.

[0052] 3) By optimizing the design of the contact spring system and magnetic system of the electromagnetic relay, the relay can have the advantages of small size, low power consumption, and large switching load.

[0053] 4) The terminals are spring-press type, with strong spring elasticity and proper engagement, which can effectively prevent the generation of electric arcs and make wiring convenient and reliable.

[0054] 5) The relay housing material is modified nylon PA66, which has excellent flame retardancy and toughness, high temperature resistance, mechanical vibration resistance and shock resistance.

[0055] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, without departing from the concept of the present utility model, the above embodiments or technical features can be freely combined, and several modifications and improvements can be made. These all fall within the protection scope of the present utility model, that is, the embodiments described "in some embodiments" can be freely combined with any of the embodiments above and below. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. An electromagnetic relay, characterized in that, Includes a housing and a relay circuit disposed within the housing; The outer shell is made of polyamide; the outer shell includes a shell and a cover, which are connected and fixed by a snap-fit ​​mechanism; The relay circuit includes a relay element and an external drive circuit connected to the relay element; the relay element is sealed and encapsulated by metal shell welding; the external drive circuit includes a protection circuit and a rectifier circuit, the AC side of the rectifier circuit and the protection circuit are connected in parallel across the two ends of an external power supply, and the DC side of the rectifier circuit is connected in parallel with the relay element.

2. The electromagnetic relay according to claim 1, characterized in that, The polyamide includes modified nylon PA66.

3. The electromagnetic relay according to claim 1, characterized in that, The protection circuit includes a varistor connected to both ends of the external power supply.

4. The electromagnetic relay according to claim 1, characterized in that, The rectifier circuit includes a bridge rectifier circuit, which includes an AC terminal and a DC terminal; The AC terminals are connected in parallel across the two ends of the external power supply; The DC terminal is connected in parallel across the coil of the relay element.

5. The electromagnetic relay according to claim 4, characterized in that, The AC terminal of the bridge rectifier circuit is also connected in series with at least one first resistor.

6. The electromagnetic relay according to claim 1, characterized in that, The peripheral drive circuit also includes an indicator circuit connected in parallel across the DC side of the rectifier circuit. The indicator circuit includes a second resistor and a light-emitting diode connected in series.

7. The electromagnetic relay according to claim 1, characterized in that, The relay element's package is filled with inert gas.

8. The electromagnetic relay according to claim 1, characterized in that, The relay element includes a coil, an armature, contacts, and a current-carrying spring; The two ends of the coil are connected in parallel to the two ends of the rectifier circuit. When the coil is energized, the armature is magnetically attracted and located in a first position close to the coil. When the coil is de-energized, the armature is located in a second position far away from the coil. The contact is connected to the guide spring. When the armature is in the first position, it is electrically connected to the contact through the guide spring. When the armature is in the second position, it is separated from the guide spring.

9. The electromagnetic relay according to claim 8, characterized in that, The internal package of the relay element is filled with inert gas at the position corresponding to the contact point; And / or, the material of the contact and the flow guide spring is silver-magnesium-nickel.

10. The electromagnetic relay according to claim 1, characterized in that, The relay element includes a terminal block, and the terminal block includes a spring-press type terminal block; And / or, the relay element includes two sets of changeover contacts connected in series.

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