Contact and reed structure and electromagnetic relay

Abstract

The utility model discloses a contact, a reed structure and an electromagnetic relay, the contact surface of the contact comprises a first contact area and a second contact area, 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. According to the utility model, the silver alloy design of the contact is optimized, the limitation that in the prior art, a single silver alloy material cannot meet various functional requirements at the same time is overcome, and the contact can realize diversified functions, so that the comprehensive performance of the contact can be remarkably improved, the capability of the contact to adapt to complex working conditions can be improved, and the application range can be expanded.

Description

Technical Field

[0001] This utility model relates to the field of relay technology, and in particular to a contact and reed structure and an electromagnetic relay. Background Technology

[0002] Contacts are the core component of relays. In existing technologies, contacts typically consist of a contact base and a silver alloy layer covering its surface, with the silver alloy layer forming the contact surface. Since different silver alloy materials have different physical properties, their performance directly affects the overall performance of the contact. However, existing technologies commonly use a single silver alloy material for the contact surface, and this single material selection makes it difficult to simultaneously meet the diverse functional requirements of contacts in practical applications. For example, a single silver alloy material often cannot simultaneously meet the dual performance requirements of low resistance and high resistance to arc erosion. Therefore, this single silver alloy material design in existing technologies has significant limitations in application and is difficult to meet the comprehensive performance requirements under complex operating conditions. Utility Model Content

[0003] This utility model addresses the technical problems existing in the prior art by providing a contact and spring structure and an electromagnetic relay. By optimizing the design of the silver alloy layer of the contact, it overcomes the limitation of the prior art that a single silver alloy material cannot simultaneously meet multiple functional requirements.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a contact point, wherein the contact surface of the contact point includes a first contact area and a second contact area, wherein:

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

[0006] The second contact area includes the final contact position when the contacts are closed, and is used to conduct 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, while 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.

[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 arc-initiating position when the contact is broken, and is used to withstand the electric arc. The ablation rate of the first silver alloy under the same electric 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 point is a spherical cap surface, and the first contact area protrudes from the second contact area.

[0013] In a preferred embodiment, the contact includes a contact substrate having a silver alloy layer thereon, one of the silver alloy layer and the contact substrate forming the first contact area, and the other of the silver alloy layer and the contact substrate forming the second contact area.

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

[0015] In a preferred embodiment, the contact includes a contact substrate on which a first silver alloy layer and a second silver alloy layer are disposed, the first silver alloy layer forming the first contact area and the second silver alloy layer forming the second contact area.

[0016] This utility model also provides a spring structure, including a spring and a contact disposed on the spring; the contact adopts the contact described in this utility model above.

[0017] Another relay according to the present invention includes a moving spring portion and a stationary spring portion, wherein the moving spring portion and / or the stationary spring portion adopts the spring structure described in the present invention above.

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

[0019] 1. This utility model divides the contact point into a first contact area and a second contact area based on the change of the contact position, and uses different silver alloy materials for the first contact area and the second contact area. This utility model optimizes the silver alloy design of the contact point, overcomes the limitation of the existing technology that a single silver alloy material cannot meet multiple functional requirements at the same time, and enables the contact point to realize diversified functions, thereby significantly improving the overall performance of the contact point, enhancing the contact point's ability to adapt to complex working conditions, and expanding the application range, etc.

[0020] 2. As a preferred embodiment, 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. This allows the contacts of this invention to 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 contacts suitable for high voltage and high current environments.

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the contact and spring structure and electromagnetic relay of the present invention are not limited to the embodiments. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural schematic diagram of the contact point of a utility model according to an embodiment;

[0023] Figure 2 This is a cross-sectional view of the contact point of a utility model according to an embodiment;

[0024] Figure 3 This is a three-dimensional structural diagram of the contact point of this utility model in Embodiment 2;

[0025] Figure 4 This is a cross-sectional view of the contact point of this utility model in Embodiment 2;

[0026] Figure 5 This is a three-dimensional structural diagram of the contact point of this utility model in Embodiment 3;

[0027] Figure 6 This is a cross-sectional view of the contact point of this utility model in Embodiment 3;

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

[0029] In this invention, the terms "first," "second," etc., are used only to distinguish similar objects, not to describe a specific order or sequence, nor should they be interpreted as indicating or implying relative importance. Furthermore, in the description of this invention, "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0030] Example 1

[0031] The present invention provides a contact point, wherein the contact surface of the contact point includes a first contact area 1 and a second contact area 2, wherein:

[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 contacts are closed, and is used to conduct current.

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

[0035] The contact surface of a contact refers to the end face where the contact is located when the contact is closed. The first contact area 1 also includes the arc-initiating position when the contact is open, which is used to withstand the electric arc. The arc-initiating position and the initial contact position can be the same position or different positions, but both are located within the first contact area 1. The initial contact position when the contact is closed refers to the position when the contact just begins to make contact, which usually occurs at the instant the contact closes. The final contact position when the contact is closed refers to the position when the contact is fully closed and reaches a stable contact state during operation. The arc-initiating position when the contact is open is the position where an electric arc is generated at the instant the contact separates.

[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. Thus, the contacts of this invention simultaneously possess low resistance and arc erosion resistance. The low resistance reduces energy loss during energization, improving the relay's efficiency; the arc erosion resistance effectively reduces material loss and performance degradation caused by arc erosion, improving the relay's reliability and safety. In this embodiment, the first silver alloy is a silver-tin alloy, and the second silver alloy is a silver-nickel alloy, but this is not a limitation.

[0037] The contact surface of the contact point is a spherical cap surface, which is the curved surface of a spherical cap, also known as a spherical cap 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 this invention specifically includes a contact substrate 3, on which a silver alloy layer 4 is disposed. One of the silver alloy layer 4 and the contact substrate 3 forms a first contact area 1, and the other of the silver alloy layer 4 and the contact substrate 3 forms a second contact area 2. Therefore, one of the contact substrate 3 and the silver alloy layer 4 is made of a first silver alloy, and the other of the contact substrate 3 and the silver alloy layer 4 is made of a second silver alloy. The silver alloy layer 4 and the contact substrate 3 can be bonded together by means of lamination or other methods.

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

[0040] In this embodiment, the contact substrate 3 is composed of two cylindrical segments with different diameters, making its longitudinal section approximately T-shaped. The groove 31 is provided in the middle of the end face of the cylindrical segment with the larger diameter. The silver alloy layer 4 is made of a first silver alloy, preferably a silver-tin alloy; the contact substrate 3 is made of a second silver alloy, preferably a silver-nickel alloy.

[0041] This invention utilizes the flexibility of the moving spring, which deforms during the contact overtravel phase, causing a change in the contact position between the moving and stationary contacts during closure. The contact surface is divided into a first contact area 1 and a second contact area 2, and these two areas are made of different silver alloy materials. This overcomes the limitations of existing technologies where a single silver alloy material cannot simultaneously meet multiple functional requirements, enabling the contact to achieve diversified functions. This significantly improves the overall performance of the contact, enhances its adaptability to complex working conditions, and expands its application range. Specifically, this invention provides a combination of two different silver alloy materials. By selecting appropriate alloy materials for the first contact area 1 and the second contact area 2, diversified functions can be achieved. As a preferred embodiment, the second silver alloy is a low-resistivity silver alloy, and the first silver alloy is a low-arc erosion rate silver alloy. This allows the contact to balance low resistance and arc erosion resistance, thereby improving the electrical durability of the relay. The materials of the first and second silver alloys are not limited to these. In practical applications, other suitable silver alloys can be selected according to actual needs to enable the contacts to perform other functions.

[0042] Example 2

[0043] Please see Figure 3 , Figure 4 As shown, the contact of this utility model differs from the first embodiment described above in that: a groove 31 is provided at the edge of one end surface of the contact base 3. Specifically, the groove 31 is a stepped groove with an L-shaped longitudinal section. A silver alloy layer, in an annular shape, is embedded within the groove 31, causing the silver alloy layer 4 to surround the middle portion of one end of the contact base 3. Therefore, the middle area of ​​one end surface of the contact base 3 constitutes the first contact area 1, and the surface of the silver alloy layer 4 exposed outside the groove 31 and located outside the first contact area 1 constitutes the second contact area 2.

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

[0045] In this embodiment, the material of the contact substrate 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] Example 3

[0047] Please see Figure 5 , Figure 6 As shown, the contact of this utility model differs from Embodiments 1 and 2 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 first silver alloy layer 5 has a circular outline, and the second silver alloy layer 6 is annular and surrounds the first silver alloy layer 5.

[0048] In this embodiment, the contact substrate 3 is also composed of two cylindrical segments with different diameters, giving it a roughly T-shaped longitudinal cross-section. A first silver alloy layer 5 and a second silver alloy layer 6 are disposed on the end face of the larger diameter cylindrical segment. Specifically, the first silver alloy layer 5 is located in the middle region of the end face of the larger diameter cylindrical segment, and the second silver alloy layer 6 is located in the edge region 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 substrate 3 is a copper substrate.

[0049] This utility model discloses a reed structure, including a reed and contacts disposed on the reed; the contacts adopt a contact type of this utility model as described in any of the above embodiments. The reed can be a movable reed or a stationary reed. When the reed is a movable reed, the contacts on it are movable contacts; when the reed is a stationary reed, the contacts on it are stationary contacts.

[0050] For details on the structure and working principle of the contacts, please refer to the previous description; they will not be repeated here.

[0051] The present invention provides a relay comprising a moving spring portion and a stationary spring portion, wherein the moving spring portion and / or the stationary spring portion adopts the spring structure of the present invention as described above.

[0052] The moving spring portion includes a moving spring sheet and a moving contact disposed on the moving spring sheet, while the stationary spring portion includes a stationary spring sheet and a stationary contact disposed on the stationary spring sheet. 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 spring is typically made of a flexible spring. To ensure stable contact and sufficient contact pressure between the moving and stationary contacts, the moving spring continues to deform under the influence of the relay's armature or pusher when the two contacts first make contact. At this point, the contact point between the moving and stationary contacts changes. Specifically, the initial contact point is located within the first contact area 1, i.e., the middle region of the contact, while the final contact point is located within the second contact area 2, i.e., the edge region of the contact. To reduce contact resistance and stability, thus minimizing temperature rise, the material of the second contact area 2 can be a low-resistivity material, such as a silver-nickel alloy. When the contact breaks, the arc typically originates from the final break position, i.e., the middle position of the contact. To improve the contact's resistance to arc erosion, the material of the first contact area 1 is preferably a material with strong arc erosion resistance, such as a silver-tin alloy. Therefore, this invention's contact part, with its inner and outer layer structure and different silver alloy materials, can accommodate both contact temperature rise and arc breaking requirements.

[0054] The contact and reed structure and electromagnetic relay of this utility model are identical to or can be implemented using existing technologies for the parts not described herein.

[0055] The above embodiments are only used to further illustrate a contact and reed structure and an electromagnetic relay of the present invention. However, the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and alterations made to the above embodiments based on 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, comprising: The contact surface of the contact includes a first contact area and a second contact area, wherein: The first contact area includes an initial contact position when the contact is closed; The second contact area includes a final contact position when the contact is closed 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.

2. The contact of claim 1, wherein: The second silver alloy has a lower resistivity than the first silver alloy.

3. The contact of claim 1, wherein: The first contact area includes an arcing position when the contact is opened for bearing arc effect, the first silver alloy has a lower ablation rate than the second silver alloy under the same arc condition.

4. The contact according to any one of claims 1-3, 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 of claim 1, wherein: The first contact area is a middle area of the contact surface, and 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 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 1-3, wherein: The contact includes a contact base, and a silver alloy layer is arranged on the contact base, one of the silver alloy layer and the contact base forms the first contact area, and the other of the silver alloy layer and the contact base forms the second contact area.

8. The contact of claim 7, wherein: One end surface of the contact base is provided with a groove, and the silver alloy layer is embedded in the groove.

9. The contact according to any one of claims 1-3, wherein: The contact includes a contact base, and a first silver alloy layer and a second silver alloy layer are arranged on the contact base, the first silver alloy layer forms the first contact area, and the second silver alloy layer forms the second contact area.

10. A reed structure comprising a reed and a contact provided on the reed; characterized in that: The contact adopts the contact as claimed in any one of claims 1-9.

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

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