Contact piece, tulip contact and circuit breaker

Abstract

The contact piece comprises a contact piece body, one side of the contact piece body is provided with a contact piece groove and a contact part used for being in contact with a static contact, the contact part comprises a first oblique straight section, an arc section and a second oblique straight section which are sequentially connected, and the first oblique straight section is obliquely arranged from the end face of the contact piece groove to the arc section. According to the utility model, the contact piece groove, the first inclined straight section, the arc section and the second inclined straight section are arranged on the contact piece body, the first inclined straight section, the arc section and the second inclined straight section are sequentially connected, and the first inclined straight section is inclined from the end face of the contact piece groove to the direction of the arc section, so that the contact piece has a larger contact area under the condition that the required contact distance is ensured; therefore, the heat dissipation area of the contact piece is increased, so that the heat dissipation effect of the contact piece is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a contact piece, a plum blossom contact and a circuit breaker. Background Art

[0002] The maximum rated current of existing 12kV vacuum circuit breakers on the market is only 4400A (requires forced air cooling with a fan), and there are no vacuum circuit breakers with a high current of 5000A. Existing vacuum circuit breakers are usually equipped with current trolley-type switchgear. However, current trolley-type switchgear generates a lot of heat during use, which is an important cause of serious accidents in the switchgear. Among them, the heating of the contact system in the switchgear is the most critical factor causing serious accidents in the switchgear. When the current in the circuit breaker is a high current of 5000A, the worst point of the high current temperature rise occurs on the plum blossom contact. Due to the small contact area between the plum blossom contact and the static contact and the limited heat dissipation area, the circuit breaker will generate severe heat during use, making the actual current carrying capacity of the circuit breaker generally unable to reach the designed current. The circuit breaker is also prone to failure after long-term use. In severe cases, the entire circuit breaker may burn out. Utility Model Content

[0003] In response to the shortcomings of the existing technology, the present invention provides a contact piece, which is provided with a contact piece groove and a first oblique straight section, an arc section and a second oblique straight section connected in sequence on the contact piece body, and the first oblique straight section is inclined from the end surface of the contact piece groove toward the arc section. While ensuring the required contact distance, the contact piece has a larger contact area, thereby increasing the heat dissipation area of ​​the contact piece, so as to improve the heat dissipation effect of the contact piece.

[0004] To achieve the above-mentioned purpose, the present invention is realized through the following technical solutions:

[0005] A contact piece includes a contact piece body, a contact piece groove and a contact portion for contacting a static contact are provided on one side of the contact piece body, the contact portion includes a first oblique straight section, an arc section and a second oblique straight section connected in sequence, and the first oblique straight section is inclined from the end surface of the contact piece groove toward the arc section.

[0006] Furthermore, the inclined angle α between the first oblique straight section and the end surface of the contact groove is an acute angle;

[0007] Preferably, the inclined angle α between the first oblique straight section and the end surface of the contact groove is 35° to 40°;

[0008] Preferably, the inclined angle α between the first oblique straight section and the end surface of the contact groove is 38.

[0009] Furthermore, the radius of the arc segment of the contact portion is greater than or equal to 6 mm and less than or equal to 15 mm.

[0010] Furthermore, the radius of the arc segment of the contact portion is 10 mm.

[0011] Furthermore, a first silver plating layer is provided on the surface of the contact portion, and a second silver plating layer is provided on the entire surface of the contact body except the contact portion, and the thickness of the second silver plating layer is less than that of the first silver plating layer.

[0012] Furthermore, the thickness of the first silver plating layer is 20 μm, and the thickness of the second silver plating layer is 1 μm.

[0013] Based on the same inventive concept, the utility model also provides a plum blossom contact, including a contact bracket, a fixing plate and several of the above-mentioned contacts. Each contact body is clamped on the contact bracket through a contact groove and arranged in a ring shape. The end of each contact body away from the contact part is fixed by a fixing plate.

[0014] Furthermore, the thickness of the contact body is 2 to 3 mm.

[0015] Furthermore, the contact piece body consists of 96 pieces.

[0016] Based on the same inventive concept, the utility model also provides a circuit breaker including the above-mentioned plum blossom contact.

[0017] The above technical solution has the following advantages or beneficial effects:

[0018] The contact piece, plum blossom contact, and circuit breaker described in the present invention utilize a contact groove and a first oblique straight section, an arc section, and a second oblique straight section connected in sequence on the contact piece body. The first oblique straight section is tilted from the end surface of the contact groove toward the arc section. This ensures a greater contact area for the contact piece while maintaining the required contact distance, thereby increasing the heat dissipation area of ​​the contact piece and improving the heat dissipation effect of the contact piece. This overcomes the technical problem of the existing plum blossom contact and the stationary contact having a small contact area and limited heat dissipation area, further improving the performance and stability of the circuit breaker in higher current carrying applications (e.g., 5000A). BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of a contact piece according to an embodiment of the present utility model.

[0020] Figure 2 It is a structural schematic diagram of the plum blossom contact of an embodiment of the utility model.

[0021] Description of labels:

[0022] 1. Contact body, 2. Plum blossom contact, 3. Contact bracket, 4. Fixing plate, 11. Contact groove, 12. Contact portion, 121. First oblique straight section, 122. Arc section, 123. Second oblique straight section. DETAILED DESCRIPTION

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0025] Please refer to the attached Figure 1 One embodiment of the present invention provides a contact piece, comprising a contact piece body 1, wherein one side of the contact piece body 1 is provided with a contact piece groove 11 and a contact portion 12 for contacting a static contact, wherein the contact portion 12 comprises a first oblique straight section 121, an arc section 122, and a second oblique straight section 123 connected in sequence, wherein the first oblique straight section 121 is inclined from the end surface of the contact piece groove 11 toward the arc section 122. It can be understood that in the present invention, by providing the contact piece groove 11 and the first oblique straight section 121, the arc section 122, and the second oblique straight section 123 connected in sequence on the contact piece body 1, and the first oblique straight section 121 is inclined from the end surface of the contact piece groove 11 toward the arc section 122, while ensuring the required contact distance, the contact piece also has a larger contact area, thereby increasing the heat dissipation area of ​​the contact piece, thereby improving the heat dissipation effect of the contact piece. This improves the technical problem of the existing plum blossom contact having a small contact area with the static contact and a limited heat dissipation area. At the same time, the contact portion 12 is configured with a first oblique straight section 121, an arc section 122 and a second oblique straight section 123, which further improves the performance stability of the circuit breaker in higher current-carrying applications (such as 5000A high current). While meeting the current-carrying requirements, it can also make more full use of materials, thereby saving materials.

[0026] Please refer to the attached Figure 1 In one preferred embodiment, the angle α between the first oblique straight section 121 and the end surface of the contact groove 11 is an acute angle. Preferably, the angle α between the first oblique straight section 121 and the end surface of the contact groove 11 is 35° to 40°. Preferably, the angle α between the first oblique straight section 121 and the end surface of the contact groove 11 is 38°. It will be appreciated that in this embodiment, the 38° angle α between the first oblique straight section 121 and the end surface of the contact groove 11 not only provides a larger contact area for the contact portion 12, but also facilitates the connection between the first oblique straight section 121 and the arc section 122.

[0027] Please refer to the attached Figure 1In one preferred embodiment, the radius of the arc segment 122 of the contact portion 12 is greater than or equal to 6 mm and less than or equal to 15 mm. Preferably, the radius of the arc segment 122 of the contact portion 12 is 10 mm. This increases the contact area between the contact body 1 and the static contact, while also saving material and ensuring that the temperature of the plum blossom contact 2 is the highest during the temperature rise test. However, those skilled in the art will appreciate that in other embodiments, the radius of the arc segment 122 may also be 8 mm, 9 mm, 11 mm, etc., and the radius of the arc segment 122 is not limited to the specific implementation methods disclosed in the above embodiments.

[0028] Please refer to the attached Figure 1 In one preferred embodiment, a first silver-plated layer is provided on the surface of the contact portion 12, and a second silver-plated layer is provided on the entire surface of the contact body 1 excluding the contact portion 12. The thickness of the second silver-plated layer is less than that of the first silver-plated layer. Preferably, the first silver-plated layer is 20 μm thick, and the second silver-plated layer is 1 μm thick. This increases the current conductivity of the contact body 1 while controlling costs. However, those skilled in the art will appreciate that in other embodiments, the thicknesses of the first and second silver-plated layers may also vary, and are not limited to the specific embodiments disclosed above.

[0029] Please refer to the attached Figure 1 To the attached Figure 2 An embodiment of the present invention also provides a plum blossom contact, including a contact bracket 3, a fixing plate 4 and several of the above-mentioned contacts. Each contact body 1 is clamped on the contact bracket 3 through a contact groove 11 and arranged in a ring shape. The end of each contact body 1 away from the contact portion 12 is fixed by the fixing plate 4, so as to obtain a complete plum blossom contact 2.

[0030] Please refer to the attached Figure 1 To the attached Figure 2 In one preferred embodiment, the thickness of the contact body 1 in the plum blossom contact 2 is 2 to 3 mm, and the number of contact bodies 1 is 96. Compared with the original plum blossom contact 2, the thickness of the contact body 1 of the plum blossom contact 2 in this embodiment is reduced, while the number is increased. As a result, the plum blossom contact 2 of this embodiment has a larger contact area and heat dissipation area. At the same time, the total cocurrent area and total material weight of the plum blossom contact 2 in this embodiment are consistent with those of the original plum blossom contact 2, preventing material waste. However, those skilled in the art should understand that in other embodiments, the thickness of the contact body 1 and the number of contact bodies 1 can also be other values, and are not limited to the specific implementation methods disclosed in the above embodiments.

[0031] Please refer to the attached Figure 1 To the attached Figure 2 An embodiment of the present invention further provides a circuit breaker, comprising the above-mentioned plum blossom contact 2.

[0032] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. Therefore, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present invention.

Claims

1. A contact sheet, characterized in that: The invention comprises a contact body (1), wherein one side of the contact body (1) is provided with a contact groove (11) and a contact portion (12) for contacting a static contact, wherein the contact portion (12) comprises a first oblique straight section (121), an arc section (122) and a second oblique straight section (123) connected in sequence, wherein the first oblique straight section (121) is arranged obliquely from the end surface of the contact groove (11) toward the arc section (122); a first silver-plated layer is provided on the surface of the contact portion (12), and a second silver-plated layer is provided on the entire surface of the contact body (1) except the contact portion (12), wherein the thickness of the second silver-plated layer is less than that of the first silver-plated layer.

2. The contact sheet according to claim 1, wherein: The inclined angle α between the first oblique straight section (121) and the end surface of the contact groove (11) is an acute angle.

3. The contact piece according to claim 1, wherein: The radius of the arc segment (122) of the contact portion (12) is greater than or equal to 6 mm and less than or equal to 15 mm.

4. The contact piece according to claim 3, characterized in that: The radius of the arc segment (122) of the contact portion (12) is 10 mm.

5. The contact piece according to claim 4, characterized in that: The thickness of the first silver plating layer is 20 μm, and the thickness of the second silver plating layer is 1 μm.

6. A plum blossom contact, characterized in that: It comprises a contact support (3), a fixing plate (4) and a plurality of contacts as claimed in any one of claims 1 to 5, wherein each contact body (1) is clamped on the contact support (3) through a contact groove (11) and is arranged in a ring shape, and one end of each contact body (1) away from the contact portion (12) is fixed by the fixing plate (4).

7. The plum blossom contact according to claim 6, characterized in that: The thickness of the contact piece body (1) is 2 to 3 mm.

8. The plum blossom contact according to claim 7, characterized in that: The contact piece body (1) consists of 96 pieces.

9. A circuit breaker, characterized in that: It comprises the plum blossom contact (2) described in any one of claims 6 to 8.

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