Contact and reed structure and electromagnetic relay

Abstract

The invention discloses a contact, a reed structure and an electromagnetic relay, a contact surface of the contact comprises a first contact area and a second contact area, and the first contact area comprises an initial contact position when the contact is closed; the second contact area comprises a final contact position when the contact is closed and is used for conducting current; the first contact area and the second contact area are different areas, the first contact area is made of a first silver alloy, the second contact area is made of a second silver alloy, and the first silver alloy and the second silver alloy are different silver alloy materials. The silver alloy design of the contact is optimized, the limitation that in the prior art, a single silver alloy material cannot meet multiple functional requirements at the same time is overcome, and the contact can achieve diversified functions, so that the comprehensive performance of the contact can be remarkably improved, the capacity of the contact for adapting to complex working conditions can be improved, and the application range can be expanded.

Description

Technical Field

[0001] The present invention relates to the technical field of relays, and particularly to a contact, a reed structure and an electromagnetic relay. Background Art

[0002] The contact is the core component of a relay. In the prior art, the contact usually consists of a contact substrate and a silver alloy layer covering its surface, and the silver alloy layer forms the contact surface of the contact. Since different silver alloy materials have different physical properties, their performance directly affects the overall performance of the contact. However, in the prior art, a single silver alloy material is generally used as the design of the contact surface, and such a single material selection is difficult to meet the diverse functional requirements of the contact in practical applications at the same time. For example, a single silver alloy material often cannot take into account the dual performance requirements of low resistance and high arc erosion resistance. Therefore, this single silver alloy material design in the prior art has obvious limitations in application and is difficult to meet the comprehensive performance requirements under complex working conditions. Summary of the Invention

[0003] In view of the technical problems existing in the prior art, the present invention provides a contact, a reed structure and an electromagnetic relay, which overcome the limitation that a single silver alloy material in the prior art cannot meet multiple functional requirements at the same time by optimizing the design of the silver alloy layer of the contact.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a contact, the contact surface of the contact includes a first contact area and a second contact area, wherein:

[0005] The first contact area includes the initial contact position when the contact is closed;

[0006] The second contact area includes the final contact position when the contact is closed, and is used for conducting current;

[0007] The first contact area and the second contact area are different areas, and the material of the first contact area is a first silver alloy, the material of the second contact area is a second silver alloy, and the first silver alloy and the second silver alloy are different silver alloy materials.

[0008] In a preferred embodiment, the resistivity of the second silver alloy is lower than that of the first silver alloy.

[0009] In a preferred embodiment, the first contact area includes the arcing position when the contact is opened, and is used to withstand the action of the arc, and the ablation rate of the first silver alloy under the same arc conditions is lower than that of the second silver alloy.

[0010] In a preferred embodiment, the first silver alloy is a silver-tin alloy, and the second silver alloy is a silver-nickel alloy.

[0011] In a preferred embodiment, the first contact area is the middle area of the contact surface, the second contact area is the edge area of the contact surface, and the second contact area surrounds the first contact area.

[0012] In a preferred embodiment, the contact surface of the contact is a spherical segment curved surface, and the first contact area protrudes from the second contact area.

[0013] In a preferred embodiment, the contact includes a contact base body, and a silver alloy layer is provided on the contact base body. One of the silver alloy layer and the contact base body forms the first contact area, and the other of the silver alloy layer and the contact base body forms the second contact area.

[0014] In a preferred embodiment, a groove is provided on one end surface of the contact base body, and the silver alloy layer is embedded in the groove.

[0015] In a preferred embodiment, the contact includes a contact base body, and a first silver alloy layer and a second silver alloy layer are provided on the contact base body. The first silver alloy layer forms the first contact area, and the second silver alloy layer forms the second contact area.

[0016] The present invention further provides a reed structure, including a reed and a contact provided on the reed; the contact adopts the contact as described in the present invention above.

[0017] Another relay of the present invention includes a moving reed part and a static reed part, and the moving reed part and / or the static reed part adopt the reed structure as described in the present invention above.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. According to the change of the contact position of the contact, the present invention is divided into a first contact area and a second contact area, and different silver alloy materials are used for the first contact area and the second contact area, so that the present invention optimizes the silver alloy design of the contact, overcomes the limitation that a single silver alloy material in the prior art cannot meet multiple functional requirements at the same time, enables the contact to realize diversified functions, can significantly improve the comprehensive performance of the contact, and can improve the ability of the contact to adapt to complex working conditions and expand the application range, etc.

[0020] 2. As a preference, the resistivity of the second silver alloy is lower than that of the first silver alloy, and the ablation rate of the first silver alloy under the same arc condition is lower than that of the second silver alloy, so that the contact of the present invention can simultaneously meet the requirements of low contact temperature rise and large load current, thereby greatly improving the electrical durability of the relay and making the contact suitable for high-voltage and large-current environments.

[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments; however, a contact and reed structure and an electromagnetic relay of the present invention are not limited to the embodiments. Description of the Drawings

[0022] Figure 1 is a schematic perspective view of the contact of the present invention in Embodiment 1;

[0023] Figure 2 is a cross-sectional view of the contact of the present invention in Embodiment 1;

[0024] Figure 3 is a schematic perspective view of the contact of the present invention in Embodiment 2;

[0025] Figure 4 is a cross-sectional view of the contact of the present invention in Embodiment 2;

[0026] Figure 5 is a schematic perspective view of the contact of the present invention in Embodiment 3;

[0027] Figure 6 is a cross-sectional view of the contact of the present invention in Embodiment 3;

[0028] In the figure, 1 is the first contact area; 2 is the second contact area; 3 is the contact base; 31 is the groove; 4 is the silver alloy layer; 5 is the first silver alloy layer; 6 is the second silver alloy layer. Detailed Embodiments

[0029] In the present invention, for terms such as "first" and "second", they are only used to distinguish similar objects, rather than to describe a specific order or sequence, nor can they be understood as indicating or implying relative importance. Additionally, in the description of the present invention, "and / or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after.

[0030] Embodiment 1

[0031] For a contact of the present invention, the contact surface of the contact includes a first contact area 1 and a second contact area 2, where:

[0032] The first contact area 1 includes the initial contact position when the contact is closed;

[0033] The second contact area 2 includes the final contact position when the contact is closed and is used to conduct current;

[0034] The first contact area 1 and the second contact area 2 are different areas. The material of the first contact area 1 is the first silver alloy, and the material of the second contact area 2 is the second silver alloy. The first silver alloy and the second silver alloy are different silver alloy materials.

[0035] The contact surface of the contact refers to the end face where the contact position is located when the contact is closed. The above-mentioned first contact area 1 further includes the arcing position when the contact is opened, which is used to withstand the action of the arc. Among them, the arcing position and the initial contact position can be the same position or different positions, but both are within the range of the first contact area 1. The initial contact position when the contact is closed refers to the position when the contact just starts to contact, usually occurring at the moment when the contact is closed. The final contact position when the contact is closed refers to the position when the contact is completely closed and reaches a stable contact state during the working process. The arcing position when the contact is opened is the position where the arc is generated at the moment when the contact is separated.

[0036] Preferably, the resistivity of the second silver alloy is lower than that of the first silver alloy, and the ablation rate of the first silver alloy under the same arc conditions is lower than that of the second silver alloy. In this way, the contact of the present invention has both low-resistance characteristics and anti-arc ablation ability. Among them, the low-resistance characteristics reduce the energy loss or loss during the energization process of the contact, improving the energy efficiency of the relay; the anti-arc ablation ability effectively reduces the material loss and performance degradation caused by arc ablation of the contact, improving the reliability and safety of the relay. In this embodiment, the first silver alloy is a silver-tin alloy, and the second silver alloy is a silver-nickel alloy, but it is not limited thereto.

[0037] The contact surface of the contact is a spherical segment curved surface, which refers to the curved surface of the spherical segment and can also be called the spherical segment surface. The first contact area 1 is the middle area of the contact surface, and the second contact area 2 is the edge area of the contact surface. The second contact area 2 surrounds the first contact area 1, and the first contact area 1 protrudes from the second contact area 2.

[0038] The contact of the present invention specifically includes a contact base body 3, and a silver alloy layer 4 is provided on the contact base body 3. One of the silver alloy layer 4 and the contact base body 3 forms the first contact area 1, and the other of the silver alloy layer 4 and the contact base body 3 forms the second contact area 2. Therefore, one of the contact base body 3 and the silver alloy layer 4 is made of the first silver alloy, and the other of the contact base body 3 and the silver alloy layer 4 is made of the second silver alloy. The silver alloy layer 4 and the contact base body 3 can be compounded together by means of pressing or the like.

[0039] A groove 31 is provided on one end surface of the contact base body 3, and the silver alloy layer 4 is embedded in the groove 31. The remaining part of the one end surface of the contact base body 3 (i.e., the part outside the groove 31) forms the second contact area 2, and the surface of the silver alloy layer 4 that is exposed outside the groove 31 and used for contact forms the first contact area 1. Specifically, the groove 31 is provided in the middle area of one end surface of the contact base body, the peripheral contour of the silver alloy layer 4 is circular, and the second contact area 2 is annular.

[0040] In this embodiment, the contact base body 3 is composed of two cylindrical segments with different diameters, so that its longitudinal section is roughly T-shaped, and the groove 31 is provided in the middle of the end surface of the larger-diameter cylindrical segment. The material of the silver alloy layer 4 is the first silver alloy, preferably silver-tin alloy; the material of the contact base body 3 is the second silver alloy, preferably silver-nickel alloy.

[0041] The present invention utilizes the flexibility of the moving reed, which will deform during the overtravel stage of the contact, so that the contact position changes during the closing process of the moving contact and the static contact. The contact surface of the contact is divided into the first contact area 1 and the second contact area 2, and different silver alloy materials are used for the first contact area 1 and the second contact area 2, so that the present invention overcomes the limitation that a single silver alloy material in the prior art cannot meet multiple functional requirements at the same time, enables the contact to achieve diversified functions, thereby can significantly improve the comprehensive performance of the contact, and can improve the ability of the contact to adapt to complex working conditions and expand the application range. Specifically, the present invention provides two ways of combining different silver alloy materials, and diversified functions can be realized by respectively selecting appropriate alloy materials for the first contact area 1 and the second contact area 2. As a preferred way, the second silver alloy of the present invention is a silver alloy material with low resistivity, and the first silver alloy is a silver alloy material with low arc ablation rate, so that the contact of the present invention can take into account the low-resistance characteristic and the anti-arc ablation characteristic, thereby contributing to improving the electrical durability of the relay. The materials of the first silver alloy and the second silver alloy are not limited to this, and other suitable silver alloy materials can be selected according to actual needs in practical applications to enable the contact to achieve other functions.

[0042] Embodiment 2

[0043] Please refer to Figure 3 、 Figure 4 As shown in

[0044] In this embodiment, the contact base 3 is also composed of two cylindrical segments with different diameters, making its longitudinal section approximately T-shaped. A groove 31 is provided at the edge position of the end face of the larger-diameter cylindrical segment.

[0045] In this embodiment, the material of the contact base 3 is a first silver alloy, preferably a silver-tin alloy; the material of the silver alloy layer 4 is a second silver alloy, preferably a silver-nickel alloy.

[0046] Embodiment III

[0047] Please refer to Figure 5 、 Figure 6 As shown, a contact of the present invention is different from the above Embodiment I and Embodiment II in that: the contact includes a contact base 3, on which a first silver alloy layer 5 and a second silver alloy layer 6 are provided. The first silver alloy layer 5 forms a first contact area 1, and the second silver alloy layer 6 forms a second contact area 2. Specifically, the peripheral contour of the first silver alloy layer 5 is circular, and the second silver alloy layer 6 is annular and surrounds the first silver alloy layer 5.

[0048] In this embodiment, the contact base 3 is also composed of two cylindrical segments with different diameters, making its longitudinal section approximately T-shaped. The first silver alloy layer 5 and the second silver alloy layer 6 are provided on the end face of the larger-diameter cylindrical segment. Specifically, the first silver alloy layer 5 is provided in the middle area of the end face of the larger-diameter cylindrical segment, and the second silver alloy layer 6 is provided in the edge area of the end face of the larger-diameter cylindrical segment. Preferably, the first silver alloy layer 5 is a silver-tin alloy, the second silver alloy layer 6 is a silver-nickel alloy, and the contact base 3 is a copper base.

[0049] A reed structure of the present invention includes a reed and a contact provided on the reed; the contact adopts a contact of the present invention as described in any of the above embodiments. The reed can be a moving reed or a stationary reed. When the reed is a moving reed, the contact thereon is a moving contact; when the reed is a stationary reed, the contact thereon is a stationary contact.

[0050] Regarding the structure and working principle of the contact, please refer to the previous description thereof, and details will not be repeated here.

[0051] A relay of the present invention includes a moving reed part and a stationary reed part, and the moving reed part and / or the stationary reed part adopts the reed structure of the present invention as described above.

[0052] The moving reed part includes a moving reed and a moving contact provided on the moving reed, and the stationary reed part includes a stationary reed and a stationary contact provided on the stationary reed. Therefore, the moving contact and / or the stationary contact adopts a contact of the present invention as described in any of the above embodiments.

[0053] The moving reed is usually a flexible reed. To ensure that the moving contact and the static contact can stably contact and have a certain contact pressure, when the moving contact and the static contact first come into contact, the moving reed will continue to deform under the push of the armature or the pushing card of the relay. At this time, the contact point between the moving contact and the static contact will change. Specifically, the initial contact point between the moving contact and the static contact is located within the first contact area 1, that is, the middle area of the contact, and the final contact point between the moving contact and the static contact is located within the second contact area 2, that is, the edge area of the contact. To make the contact resistance of the contact smaller and more stable to reduce the temperature rise, the material of the second contact area 2 can be selected as a material with a low resistivity, such as silver-nickel alloy; when the contact is disconnected, the arc usually starts from the final disconnection position, that is, the middle position of the contact. To improve the anti-arc ablation ability of the contact, the material of the first contact area 1 is preferably a material with strong anti-arc ablation ability, such as silver-tin alloy. Therefore, the way that the contact part of the contact of the present invention adopts an inner and outer layer structure distribution and different silver alloy materials can meet the requirements of contact temperature rise and arc during disconnection.

[0054] A contact, reed structure and electromagnetic relay of the present invention, the parts not involved are the same as or can be implemented by the prior art.

[0055] The above embodiments are only used to further illustrate a contact, reed structure and electromagnetic relay of the present invention, but the present invention is not limited to the embodiments. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A contact, characterized in that: The contact surface of the contact comprises a first contact area and a second contact area, wherein: The first contact region includes an initial contact position when the contacts are closed; The second contact region includes a final contact position when the contacts are closed for conducting current; The first contact area and the second contact area are different areas, and the material of the first contact area is a first silver alloy, and the material of the second contact area is a second silver alloy. The first silver alloy and the second silver alloy are different silver alloy materials.

2. The contact according to claim 1, characterized in that: The resistivity of the second silver alloy is lower than the resistivity of the first silver alloy.

3. The contact according to claim 1, characterized in that: The first contact area includes an arc starting position when the contact is disconnected, and is used to withstand the action of the arc. The ablation rate of the first silver alloy under the same arc conditions is lower than that of the second silver alloy.

4. The contact according to any one of claims 1 to 3, characterized in that: The first silver alloy is a silver-tin alloy, and the second silver alloy is a silver-nickel alloy.

5. The contact according to claim 1, characterized in that: The first contact area is a middle area of ​​the contact surface, the second contact area is an edge area of ​​the contact surface, and the second contact area surrounds the first contact area.

6. The contact according to claim 1 or 5, characterized in that: The contact surface of the contact point is a spherical segment surface, and the first contact area protrudes from the second contact area.

7. The contact according to any one of claims 1 to 3, characterized in that: The contact includes a contact substrate on which a silver alloy layer is provided, one of the silver alloy layer and the contact substrate forms the first contact area, and the other of the silver alloy layer and the contact substrate forms the second contact area.

8. The contact according to claim 7, characterized in that: A groove is provided on one end surface of the contact substrate, and the silver alloy layer is embedded in the groove.

9. The contact according to any one of claims 1 to 3, characterized in that: The contact comprises a contact substrate, on which a first silver alloy layer and a second silver alloy layer are provided, wherein the first silver alloy layer forms the first contact region, and the second silver alloy layer forms the second contact region.

10. A reed structure, comprising a reed and a contact point arranged on the reed; characterized in that: The contact is the contact as claimed in any one of claims 1 to 9.

11. A relay, comprising a moving spring part and a stationary spring part, characterized in that: The dynamic spring part and / or the static spring part adopts the spring leaf structure as claimed in claim 10.

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