A dual-break vacuum interrupter

Abstract

The application relates to a double-break vacuum arc-extinguishing chamber, buffer bellows and insulation shell connection, buffer bellows and metal heat-conducting plate connection, the other ends of two insulation shells being fixedly connected with two cover plates respectively; two movable conducting rods being slidably connected with the two cover plates respectively; two first bellows being slidably connected with the two movable conducting rods respectively, one end of the two first bellows being fixedly connected with the two cover plates respectively, two movable contacts being fixedly connected with the two movable conducting rods respectively; one end of a first static conducting rod and a second static conducting rod being fixedly connected with the two end planes of the metal heat-conducting plate respectively, the other end of the first static conducting rod and the second static conducting rod being fixedly connected with a first static contact and a second static contact respectively, shielding covers being arranged outside the movable contacts and the static contacts, and the two shielding covers being fixed in the insulation shells. The double-break vacuum arc-extinguishing chamber has high mechanical strength and good heat dissipation effect, and belongs to the technical field of arc-extinguishing chambers.

Description

Technical Field

[0001] This invention relates to the field of arc-extinguishing chamber technology, specifically to a double-break vacuum arc-extinguishing chamber. Background Technology

[0002] Vacuum interrupters are core components of medium- and high-voltage power switches. Their main function is to extinguish the electric arc quickly after the power supply to the medium- and high-voltage circuit is cut off, utilizing the excellent insulation properties of vacuum, thus achieving successful interruption of the main circuit. Due to the saturation phenomenon in the breakdown voltage and gap length of the vacuum gap, connecting multiple single-break vacuum interrupters in series in a certain manner to form a multi-break vacuum interrupter is one of the technical routes for its application in ultra-high voltage fields. An existing double-break vacuum interrupter has the following structure: two moving contacts at the top and bottom, along with a stationary contact in the middle, form two short vacuum gaps, with the middle contact fixed to the insulating shell. Because it is difficult to ensure that both moving contacts simultaneously contact the middle stationary contact during closing, the middle stationary contact is subjected to an impact during closing, which can easily cause loosening at the connection between the middle contact and the insulating shell, making it difficult to guarantee mechanical strength.

[0003] On the other hand, vacuum interrupters generate a large amount of heat when interrupting current. If this heat is not dissipated in time, it will not only affect the breaking performance of the vacuum interrupter but also reduce its service life. For compact double-break vacuum interrupters, heat dissipation should be given even more consideration to improve their breaking capacity. Summary of the Invention

[0004] To address the technical problems existing in the prior art, the purpose of this invention is to provide a double-break vacuum interrupter, solving the problems of insufficient mechanical strength and poor heat dissipation in existing vacuum interrupters.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A double-break vacuum interrupter includes a first bellows, an insulating shell, a moving conductive rod, a moving contact, a shielding cover, a buffer bellows, a first stationary conductive rod, a metal heat-conducting plate, a second stationary conductive rod, a first stationary contact, a second stationary contact, and a cover plate. The shielding cover, buffer bellows, moving contact, moving conductive rod, first bellows, insulating shell, and cover plate are all present in duplicate. One end of each of the two buffer bellows is fixedly connected to one end of each of the two insulating shells, and the other end of each buffer bellows is fixedly connected to both ends of the metal heat-conducting plate. The other ends of each of the two insulating shells are fixedly connected to the two cover plates. The two moving conductive rods pass through the two cover plates respectively. Two moving conductive rods are slidably connected to two cover plates respectively; two first corrugated pipes are slidably connected to two moving conductive rods respectively, one end of each of the two first corrugated pipes is fixedly connected to the two cover plates respectively, and two moving contacts are fixedly connected to two moving conductive rods respectively; one end of each of the first and second stationary conductive rods is fixedly connected to the two end planes of the metal heat-conducting plate respectively, and the other ends of each of the first and second stationary conductive rods are fixedly connected to the first and second stationary contacts respectively; one shielding cover covers the outside of one moving contact and the first stationary contact, and another shielding cover covers the outside of the other moving contact and the second stationary contact; both shielding covers are fixed inside the insulating shell.

[0007] As a preferred embodiment, the double-break vacuum interrupter also includes a heat dissipation ring, which is fixed to the outer edge of the metal heat-conducting plate.

[0008] As a preferred option, the metal heat-conducting plate is disc-shaped.

[0009] As a preferred embodiment, the metal heat-conducting plate, the first static conductive rod, and the second static conductive rod are integrally formed. The first static conductive rod and the second static conductive rod have the same structure. The thickness of the metal heat-conducting plate is a, and the diameter of the first static conductive rod is b, where a = 0.5b.

[0010] As a preferred option, the metal heat-conducting plate is made of copper.

[0011] As a preferred embodiment, the radius of the metal heat-conducting plate is larger than the radius of the buffer bellows, and the edge of the metal heat-conducting plate extends outward from the double-break vacuum interrupter.

[0012] As a preferred option, the wall thickness of the buffer bellows is greater than the wall thickness of the insulating shell.

[0013] As a preferred option, the buffer bellows and the insulating shell are arranged coaxially.

[0014] As a preferred option, the buffer bellows is made of stainless steel.

[0015] As a preferred option, the heat dissipation ring is made of copper.

[0016] In summary, the present invention has the following advantages:

[0017] This invention provides a double-break vacuum interrupter, in which a metal heat-conducting plate is connected to a first and a second stationary conductive rod, with a portion of the metal heat-conducting plate exposed outside the interrupter. A heat dissipation ring is connected to the end of the metal heat-conducting plate, further increasing the heat dissipation area. Therefore, the heat generated during the interruption process can be dissipated through the metal heat-conducting plate and the heat dissipation ring. Furthermore, the metal heat-conducting plate is connected to the insulating shell via a buffer bellows, which effectively reduces the impact of the closing force on the connection point and improves the overall mechanical strength of the double-break vacuum interrupter. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of a double-break vacuum interrupter;

[0019] In the diagram: 1. First bellows; 2. Moving conductive rod; 3. Moving contact; 4. Shielding cover; 5. Buffer bellows; 6. First stationary conductive rod; 7. Insulating shell; 8. Metal heat-conducting plate; 9. Second stationary conductive rod; 10. First stationary contact; 11. Second stationary contact; 12. Cover plate; 13. Heat dissipation ring. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to specific embodiments.

[0021] like Figure 1As shown, a double-break vacuum interrupter includes a first bellows, an insulating shell, a moving conductive rod, a moving contact, a shield, a buffer bellows, a first stationary conductive rod, a metal heat-conducting plate, a second stationary conductive rod, a first stationary contact, a second stationary contact, and a cover plate. The shield, buffer bellows, moving contact, moving conductive rod, first bellows, insulating shell, and cover plate are all present in pairs. One end of each of the two buffer bellows is fixedly connected to one end of each of the two insulating shells, and the other end of each buffer bellows is fixedly connected to both ends of the metal heat-conducting plate. The other ends of each of the two insulating shells are fixedly connected to the two cover plates. The two moving conductive rods pass through the two cover plates respectively. Two moving conductive rods are slidably connected to two cover plates, respectively; two first corrugated pipes are slidably connected to two moving conductive rods, and one end of each first corrugated pipe is fixedly connected to the two cover plates. Two moving contacts are fixedly connected to two moving conductive rods, respectively. One end of each first and second stationary conductive rod is fixedly connected to the two end planes of a metal heat-conducting plate, respectively, and the other ends are fixedly connected to the first and second stationary contacts, respectively. One shielding cover covers one moving contact and the first stationary contact, and another shielding cover covers the other moving contact and the second stationary contact. Both shielding covers are fixed inside the insulating shell. The heat generated during the opening of the vacuum interrupter can be conducted to the heat dissipation ring through the metal heat-conducting plate and then dissipated. Furthermore, the metal heat-conducting plate is connected to the insulating shell through a buffer corrugated pipe, which effectively reduces the impact of the closing force on the connection and improves the mechanical strength of the vacuum interrupter.

[0022] In this embodiment, the two cover plates are symmetrical along the metal heat-conducting plate, the two insulating shells are symmetrical along the metal heat-conducting plate, the two buffer bellows are symmetrical along the metal heat-conducting plate, the two moving conductive rods are symmetrical along the metal heat-conducting plate, the two moving contacts are symmetrical along the metal heat-conducting plate, the two shielding covers are symmetrical along the metal heat-conducting plate, the first and second stationary conductive rods are symmetrical along the metal heat-conducting plate, the first and second stationary contacts are symmetrical along the metal heat-conducting plate, and the two first bellows are symmetrical along the metal heat-conducting plate. The first bellows, the moving contacts, and one shielding cover are all located inside the insulating shell. The first stationary contact and one moving conductive rod are arranged opposite each other, and the second stationary contact and another moving conductive rod are arranged opposite each other.

[0023] The double-break vacuum interrupter also includes a heat dissipation ring, which is fixed to the outer edge of the metal heat-conducting plate.

[0024] The metal heat-conducting plate is disc-shaped.

[0025] The metal heat-conducting plate, the first static conductive rod, and the second static conductive rod are integrally formed. The first and second static conductive rods have identical structures. The thickness of the metal heat-conducting plate is 'a', and the diameter of the first static conductive rod is 'b', where a = 0.5b. The first and second static conductive rods are located at the centers of the two end planes of the metal heat-conducting plate, respectively.

[0026] The metal heat-conducting plate is made of copper.

[0027] The radius of the metal heat-conducting plate is larger than that of the buffer bellows, and the edge of the metal heat-conducting plate extends outward from the double-break vacuum interrupter.

[0028] The wall thickness of the buffer bellows is greater than the wall thickness of the insulating shell.

[0029] The buffer bellows and the insulating shell are arranged coaxially.

[0030] The buffer bellows is made of stainless steel.

[0031] The heat dissipation ring is made of copper. The cross-section of the heat dissipation ring is circular, and its vertical projection is a ring.

[0032] In this embodiment, the first bellows, insulating shell, moving conductive rod, moving contact, shielding cover, first stationary conductive rod, second stationary conductive rod, first stationary contact, second stationary contact, and cover plate are all components of existing vacuum interrupters.

[0033] The insulating outer shell in this embodiment has a cylindrical structure.

[0034] Compared with the vacuum interrupter structure used in the prior art, the double-break vacuum interrupter provided in this embodiment has a simple structure, can avoid the connection between the metal heat-conducting plate and the insulating ceramic shell from loosening due to excessive impact force when closing, has high mechanical strength, and has good heat dissipation capacity.

[0035] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A double-break vacuum interrupter, characterized in that: The system includes a first corrugated pipe, an insulating shell, a moving conductive rod, a moving contact, a shielding cover, a buffer corrugated pipe, a first stationary conductive rod, a metal heat-conducting plate, a second stationary conductive rod, a first stationary contact, a second stationary contact, and a cover plate. There are two of each of the following: a shielding cover, a buffer corrugated pipe, a moving contact, a moving conductive rod, a first corrugated pipe, an insulating shell, and a cover plate. One end of each of the two buffer corrugated pipes is fixedly connected to one end of each of the two insulating shells. The other end of each of the two buffer corrugated pipes is fixedly connected to one of the two axial end planes of the metal heat-conducting plate. The other end of each of the two insulating shells is fixedly connected to one of the two cover plates. Two moving conductive rods pass through each of the two cover plates and are slidably connected to each of the two cover plates. The two first corrugated pipes... One end of each of the two tubes is slidably connected to two moving conductive rods, and the other ends of the two first bellows are fixedly connected to two cover plates. The two moving contacts are fixedly connected to the two moving conductive rods. One end of the first and second stationary conductive rods is fixedly connected to the two axial end planes of the metal heat-conducting plate, and the other end of the first stationary conductive rod is fixedly connected to the first stationary contact. The other end of the second stationary conductive rod is fixedly connected to the second stationary contact. A shielding cover covers the outside of one moving contact and the first stationary contact, and another shielding cover covers the outside of the other moving contact and the second stationary contact. Both shielding covers are fixed inside the insulating shell. The double-break vacuum interrupter also includes a heat dissipation ring, which is fixed to the outer edge of the metal heat-conducting plate.

2. A double-break vacuum interrupter according to claim 1, characterized in that: The metal heat-conducting plate is disc-shaped.

3. A double-break vacuum interrupter according to claim 1, characterized in that: The metal heat-conducting plate, the first static conductive rod, and the second static conductive rod are integrally formed. The first static conductive rod and the second static conductive rod have the same structure. The thickness of the metal heat-conducting plate is a, and the diameter of the first static conductive rod is b, where a = 0.5b.

4. A double-break vacuum interrupter according to claim 2, characterized in that: The metal heat-conducting plate is made of copper.

5. A double-break vacuum interrupter according to claim 4, characterized in that: The radius of the metal heat-conducting plate is larger than that of the buffer bellows, and the edge of the metal heat-conducting plate extends outward from the double-break vacuum interrupter.

6. A double-break vacuum interrupter according to claim 5, characterized in that: The wall thickness of the buffer bellows is greater than the wall thickness of the insulating shell.

7. A double-break vacuum interrupter according to claim 6, characterized in that: The buffer bellows and the insulating shell are arranged coaxially.

8. A double-break vacuum interrupter according to claim 7, characterized in that: The buffer bellows is made of stainless steel.

9. A double-break vacuum interrupter according to claim 1, characterized in that: The heat dissipation ring is made of copper.

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