A contact system for a vacuum circuit breaker

Abstract

The utility model relates to low voltage electrical apparatus technical field especially relates to a contact system of vacuum circuit breaker, the contact system includes vacuum bubble, moving contact, static contact, first conducting row and second conducting row, two conducting rows are connected in moving contact from the one end of vacuum bubble and the one end of static contact from vacuum bubble, first conducting row includes first conducting row main part and sets up a plurality of first radiating fins on first conducting row main part, and second conducting row includes second conducting row main part and sets up a plurality of second radiating fins on second conducting row main part. Since the conducting row of moving contact and static contact is provided with radiating fin, the heat of moving contact and static contact can be dissipated in time through the radiating fin, so that even in the case of large loop resistance, the heat of moving contact and static contact can be reduced in time through the improvement of radiating fin, and the temperature rise of contact loop is qualified.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, and in particular to a contact system for a vacuum circuit breaker. Background Technology

[0002] Circuit breakers are classified into air circuit breakers and vacuum circuit breakers according to the different working environments of their contacts. For example... Figure 3 As shown, the moving contact 4 and the stationary contact 5 of the vacuum circuit breaker are sealed at one end within the vacuum bubble 3, which enables its application in high-voltage applications.

[0003] Vacuum circuit breakers suffer from the defect that the heat from the moving and stationary contacts cannot be dissipated in a timely manner. The reasons are as follows: (1) In order to ensure the mechanical performance of vacuum circuit breakers, the conductor busbars and contact parts of the moving and stationary contacts are made of copper-chromium materials. Compared with the moving and stationary contacts of air circuit breakers, the resistivity and thermal conductivity of the moving and stationary contacts of vacuum circuit breakers are higher. Therefore, the contact circuit resistance and temperature rise of vacuum circuit breakers are larger. (2) Since the contacting end of the moving and stationary contacts is sealed in a vacuum bubble and the moving contact is an integral structure, the heat dissipation effect of the moving and stationary contacts is poor. As mentioned above, the temperature rise of the contact circuit is large and the heat dissipation effect of the moving and stationary contacts is poor. This will cause the heat of the moving and stationary contacts to be unable to be dissipated in a timely manner, and they will remain in a high-temperature state for a long time, thereby affecting the performance of the circuit breaker. Utility Model Content

[0004] The purpose of this invention is to provide a contact system for a vacuum circuit breaker to solve the technical problem that the heat of the moving and stationary contacts of the existing vacuum circuit breaker cannot be dissipated in a timely manner.

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

[0006] A contact system for a vacuum circuit breaker includes a vacuum bulb, a moving contact, and a stationary contact. The moving contact has a first end and a second end, and the stationary contact has a third end and a fourth end. The first end of the moving contact and the third end of the stationary contact are both located inside the vacuum bulb, and the second end of the moving contact and the fourth end of the stationary contact both extend out of the vacuum bulb. The system also includes a first conductive bar and a second conductive bar, wherein:

[0007] The first conductive bus is connected to the second end of the moving contact, and includes a first conductive bus body and a plurality of first heat sinks disposed on the first conductive bus body, wherein at least a portion of the plurality of first heat sinks are first heat sinks a;

[0008] The second conductive bus is connected to the fourth end of the stationary contact, and includes a second conductive bus body and a plurality of second heat sinks disposed on the second conductive bus body, wherein at least a portion of the plurality of second heat sinks is a second heat sink a;

[0009] The plurality of first heat sinks a and the plurality of second heat sinks a are arranged in a ring or arc shape with the moving contact's movement trajectory as the center line.

[0010] In some embodiments, a portion of the plurality of first heat sinks are first heat sinks b, and the plurality of first heat sinks b are arranged in a straight line;

[0011] And / or, a portion of the plurality of second heat sinks are second heat sinks b, and the plurality of second heat sinks b are arranged in a straight line.

[0012] In some embodiments, the first heat sink is provided on the side of the first conductive bus body that is close to the vacuum bubble and / or on the side that is away from the vacuum bubble;

[0013] And / or, the second heat sink is provided on the side of the second conductive bus body that is close to the vacuum bubble and / or on the side that is away from the vacuum bubble.

[0014] In some embodiments, the first conductive bar includes a pair of first conductive clamps for clamping the second end of the moving contact;

[0015] Alternatively, the first conductive busbar includes a plurality of first fastener through holes a, and the second end of the moving contact is provided with a first threaded hole corresponding one-to-one with the plurality of first fastener through holes a, and a corresponding set of first fastener through holes a and first threaded holes are interconnected by fasteners.

[0016] In some embodiments, the second conductive bus includes a pair of second conductive clamps for clamping the fourth end of the stationary contact;

[0017] Alternatively, the second conductive busbar includes a plurality of second fastener through holes a, and the fourth end of the stationary contact is provided with a second threaded hole corresponding one-to-one with the plurality of second fastener through holes a, and a corresponding set of second fastener through holes a and second threaded holes are interconnected by fasteners.

[0018] In some embodiments, the first conductive bus body has a plurality of first fastener through holes for screws to pass through;

[0019] And / or, the second conductive bus body has a plurality of second fastener through holes for screws to pass through.

[0020] In some embodiments, the first conductive bus body is U-shaped and includes a first conductive segment a, a first conductive segment b, and a first transition segment connected between the first conductive segment a and the first conductive segment b. The first conductive segment a is connected to the moving contact, the first conductive segment b is provided with the first heat sink, and the first conductive segment b is connected to an external circuit.

[0021] Alternatively, the first conductive busbar body is in the shape of a straight strip, and its two ends are respectively connected to the moving contact and the external circuit.

[0022] In some embodiments, the second conductive bus body is U-shaped and includes a second conductive segment a, a second conductive segment b, and a second transition segment connected between the second conductive segment a and the second conductive segment b. The second conductive segment a is connected to the stationary contact, the second conductive segment b is provided with the second heat sink, and the second conductive segment b is connected to an external circuit.

[0023] Alternatively, the second conductive bus body is in the shape of a straight strip, and its two ends are respectively connected to the stationary contact and the external circuit.

[0024] In some embodiments, the first conductive bus body and each of the first heat sinks are integrally formed;

[0025] Alternatively, each of the first heat sinks may be spliced ​​onto the first conductive busbar body.

[0026] In some embodiments, the second conductive bus body and each of the second heat sinks are integrally formed;

[0027] Alternatively, each of the second heat sinks is spliced ​​onto the main body of the second conductive busbar.

[0028] The beneficial effects of this utility model are:

[0029] The contact system of the vacuum circuit breaker provided in this application includes a vacuum bulb, a moving contact, a stationary contact, a first conductive bar, and a second conductive bar. The two conductive bars are respectively connected to the end of the moving contact that extends from the vacuum bulb and the end of the stationary contact that extends from the vacuum bulb. The first conductive bar includes a first conductive bar body and multiple first heat sinks disposed on the first conductive bar body. The second conductive bar includes a second conductive bar body and multiple second heat sinks disposed on the second conductive bar body. Since heat sinks are provided on both the conductive bars connected to the moving and stationary contacts, the heat from the moving and stationary contacts can be dissipated in a timely manner. Therefore, even with a large circuit resistance, the improved heat sinks can effectively reduce the heat from the moving and stationary contacts, ensuring that the temperature rise of the contact circuit meets requirements. Attached Figure Description

[0030] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0031] Figure 1 This is a cross-sectional view of a conventional air circuit breaker;

[0032] Figure 2 This is a schematic diagram of the structure of the moving contact in a conventional air circuit breaker;

[0033] Figure 3 This is a schematic diagram of the internal structure of a vacuum bulb in a conventional vacuum circuit breaker.

[0034] Figure 4 This is a three-dimensional structural diagram of the contact system provided in Embodiment 1 of this utility model;

[0035] Figure 5 A three-dimensional structural schematic diagram of the first conductive bus provided in Embodiment 1 of this utility model;

[0036] Figure 6 A three-dimensional structural schematic diagram of the second conductive bus provided in Embodiment 1 of this utility model;

[0037] Figure 7 This is a longitudinal cross-sectional schematic diagram of the contact system provided in Embodiment 2 of this utility model;

[0038] Figure 8 This is a longitudinal cross-sectional schematic diagram of the contact system provided in Embodiment 3 of this utility model;

[0039] Figure 9 A three-dimensional schematic diagram of the first conductive bus provided in Embodiment 3 of this utility model;

[0040] Figure 10 This is a three-dimensional schematic diagram of the first conductive bus provided in Embodiment 4 of this utility model.

[0041] icon:

[0042] 1-First conductive busbar; 11-First conductive busbar body; 111-First conductive segment a; 112-First conductive segment b; 113-First transition segment; 12-First heat sink; 121-First heat sink a; 122-First heat sink b; 13-First conductive clamp; 14-First insertion hole; 15-First fastener through hole a; 16-First fastener through hole b;

[0043] 2-Second conductive busbar; 21-Second conductive busbar body; 22-Second heat sink; 221-Second heat sink a; 222-Second heat sink b; 23-Second conductive clamp; 24-Second insertion hole; 25-Second fastener through hole a; 26-Second fastener through hole b;

[0044] 3-Vacuum bubble;

[0045] 4-Moving contact;

[0046] 5-Stationary contact. Detailed Implementation

[0047] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0048] It should be noted that in the description of this utility model, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0049] It should be noted that in the description of this utility model, the terms "connection" and "installation" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or a connection through an intermediate medium; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0050] like Figure 1 and Figure 2 As shown, the contact circuit of an air circuit breaker is generally composed of an incoming line busbar, a stationary contact (5 parts), a moving contact (4 parts), a flexible connection, and an outgoing line busbar. The main body of the conductive busbars of the moving and stationary contacts is made of pure copper or near-pure copper. The moving and stationary contacts (i.e., the contact parts of the moving and stationary contacts) are generally made of silver contacts with extremely high thermal conductivity. The moving contact is generally divided into several moving contact pieces arranged side by side. The above structure makes the heat dissipation effect of the moving and stationary contacts better, the contact circuit resistance is small, and the temperature rise is also relatively small.

[0051] like Figure 3As shown, the contact circuit of a vacuum circuit breaker is generally as follows: incoming line busbar - moving contact 4 - stationary contact 5 - outgoing line busbar. The contact ends of the moving contact 4 and stationary contact 5 are sealed within a vacuum bulb 3. The main body and contact parts of the moving and stationary contacts are made of copper-chromium material. Copper-chromium has a resistivity of 2.15 × 10⁻⁸ Ωm and a thermal conductivity of 100–200 W / mK. The resistivity of copper-chromium is higher than that of pure copper (1.68 × 10⁻⁸ Ωm), while its thermal conductivity is lower than that of pure copper, silver-tungsten, and silver (silver-tungsten has a thermal conductivity of 410–420 W / mK, silver has a thermal conductivity of 429 W / mK, and pure copper has a thermal conductivity of 401 W / mK). Therefore, compared to air circuit breakers, vacuum circuit breakers have a higher overall circuit resistance and a greater temperature rise. Meanwhile, the contact ends of the moving and stationary contacts are sealed inside a vacuum bulb, and the moving contact has a one-piece rod-shaped structure, resulting in poor heat dissipation between the moving and stationary contacts. The inability to dissipate heat from the moving and stationary contacts of a vacuum circuit breaker in a timely manner will affect the circuit breaker's performance.

[0052] Based on the above technical problems, this utility model provides a contact system for a vacuum circuit breaker, referring to... Figures 4 to 10 The contact system includes a vacuum bulb 3, a moving contact 4, a stationary contact 5, a first conductive bus 1, and a second conductive bus 2. The moving contact 4 has a first end and a second end, and the stationary contact 5 has a third end and a fourth end. The first end of the moving contact 4 and the third end of the stationary contact 5 are both located inside the vacuum bulb 3, and the second end of the moving contact 4 and the fourth end of the stationary contact 5 both protrude from the vacuum bulb 3. The first conductive bus 1 is connected to the second end of the moving contact 4 and includes a first conductive bus body 11 and a plurality of first heat sinks 12 disposed on the first conductive bus body 11. At least a portion of the plurality of first heat sinks 12 are first heat sinks a121. The second conductive bus 2 is connected to the fourth end of the stationary contact 5 and includes a second conductive bus body 21 and a plurality of second heat sinks 22 disposed on the second conductive bus body 21. At least a portion of the plurality of second heat sinks 22 are second heat sinks a221. The plurality of first heat sinks a121 and the plurality of second heat sinks a221 are arranged in a ring or arc shape with the moving trajectory of the moving contact 4 as the center line.

[0053] It should be noted that the moving contact 4 in the vacuum circuit breaker can move linearly along the direction approaching and moving away from the stationary contact 5 (i.e., the axial direction of the moving contact 4) to achieve contact and separation between the moving and stationary contacts. Therefore, the multiple first heat sinks a121 and the multiple second heat sinks a221 all move linearly along the axial direction of the moving contact 4 (i.e., the axial direction of the moving contact 4). Figure 6 The dotted lines (in the text) are arranged in a ring or arc with the center line as the center line.

[0054] It should also be noted that, taking multiple first heat sinks 12 as an example, the meaning of "at least some" above includes: all first heat sinks 12 are first heat sinks a121, and a portion of the first heat sinks 12 are first heat sinks a121.

[0055] In the operation of the contact system provided in this application, the heat on the moving contact 4 can be transferred to the first conductive busbar 1 and dissipated in a timely manner through the first heat sink 12 of the first conductive busbar 1, thereby reducing the temperature rise of the moving contact 4. Similarly, the heat on the stationary contact 5 can be transferred to the second conductive busbar 2 and dissipated in a timely manner through the second heat sink 22 of the second conductive busbar 2, thereby reducing the temperature rise of the stationary contact 5. Since the conductive busbars at both the moving and stationary contacts of this vacuum circuit breaker are equipped with heat sinks, even under conditions of high circuit resistance, the improved heat sinks can dissipate the heat from the moving and stationary contacts in a timely manner, ensuring that the temperature rise of the contact circuit is within acceptable limits.

[0056] Furthermore, the first conductive bus body 11 is provided with a first connecting structure a and a first connecting structure b, wherein the first connecting structure a is used to connect to the moving contact 4, and the first connecting structure b is used to connect to an external circuit. The first conductive bus body 11 is connected in series in the contact circuit of the circuit breaker through the first connecting structure a and the first connecting structure b. Similarly, the second conductive bus body 21 is connected in series in the contact circuit of the circuit breaker through the second connecting structure a and the second connecting structure b thereon.

[0057] In some embodiments, a first heat sink 12 is provided on the side of the first conductive bus body 11 that is close to the vacuum bulb 3 and / or on the side that is away from the vacuum bulb 3. In some embodiments, a second heat sink 22 is provided on the side of the second conductive bus body 21 that is close to the vacuum bulb 3 and / or on the side that is away from the vacuum bulb 3. It should be noted that, in addition to the two surfaces of the conductive bus body that are close to and away from the vacuum bulb 3, heat sinks can also be appropriately arranged on the other surfaces of the conductive bus body according to their area size and heat dissipation requirements.

[0058] As an optional embodiment, the first conductive busbar 1 includes a pair of first conductive clamps 13, which are used to clamp the second end of the moving contact 4; or, the first conductive busbar 1 includes a plurality of first fastener through holes a15, and the second end of the moving contact 4 is provided with a first threaded hole corresponding one-to-one with the plurality of first fastener through holes a15, and the corresponding set of first fastener through holes a15 and first threaded holes are interconnected by fasteners. The pair of first conductive clamps 13 and the plurality of first fastener through holes a15 constitute the first connection structure a described above. Both of the above methods can realize the connection between the first conductive busbar 1 and the moving contact 4.

[0059] As an optional embodiment, the second conductive busbar 2 includes a pair of second conductive clamps 23 for clamping the fourth end of the stationary contact 5; or, the second conductive busbar 2 includes a plurality of second fastener through holes a25, and the fourth end of the stationary contact 5 is provided with a second threaded hole corresponding one-to-one with the plurality of second fastener through holes a25, and the corresponding set of second fastener through holes a25 and second threaded holes are interconnected by fasteners. The pair of second conductive clamps 23 and the plurality of second fastener through holes a25 constitute the second connection structure a described above. Both of the above methods can realize the connection between the second conductive busbar 2 and the stationary contact 5.

[0060] In some embodiments, the first conductive bus body 11 has a plurality of first fastener through holes for screws to pass through. By providing the first fastener through holes in the first conductive bus body 11, the first conductive bus 1 can be fixed in a specific position. Similarly, in some embodiments, the second conductive bus body 21 has a plurality of second fastener through holes for screws to pass through. By providing the second fastener through holes, the second conductive bus 2 can be fixed in a specific position.

[0061] As an optional embodiment, the first conductive bus body 11 is U-shaped, including a first conductive segment a111, a first conductive segment b112, and a first transition segment 113 connected between the first conductive segment a111 and the second conductive segment b112. The first conductive segment a111 is connected to the moving contact 4, and a first heat sink 12 is provided on the first conductive segment b112, and the first conductive segment b112 is connected to an external circuit. Alternatively, the first conductive bus body 11 is straight, and both ends of the first conductive bus body 11 are connected to the moving contact 4 and the external circuit, respectively.

[0062] As an optional embodiment, the second conductive bus body 21 is U-shaped, including a second conductive segment a, a second conductive segment b, and a second transition segment connecting the second conductive segment a and the second conductive segment b. The second conductive segment a is connected to the stationary contact 5, the second conductive segment b is provided with a second heat sink 22, and the second conductive segment b is connected to an external circuit; or, the second conductive bus body 21 is straight, and the two ends of the second conductive bus body 21 are respectively connected to the stationary contact 5 and the external circuit.

[0063] As an optional embodiment, the first conductive bus body 11 and each of the first heat sinks 12 are integrally formed; or, each of the first heat sinks 12 is spliced ​​onto the first conductive bus body 11.

[0064] As an optional embodiment, the second conductive bus body 21 and each of the second heat sinks 22 are integrally formed; or, each of the second heat sinks 22 is spliced ​​onto the second conductive bus body 21.

[0065] The above embodiments of this application can be combined in any way, and the resulting technical solutions are also within the protection scope of this application.

[0066] The present application will be described in detail below with reference to several specific embodiments.

[0067] Example 1

[0068] Reference Figures 4 to 6 In this embodiment, all the first heat sinks 12 are disposed on the side of the first conductive bus body 11 facing away from the vacuum bubble 3, and all the second heat sinks 22 are disposed on the side of the second conductive bus body 21 facing away from the vacuum bubble 3.

[0069] Reference Figure 5 In this embodiment, the first conductive bus body 11 is U-shaped and includes a first conductive segment a111, a first conductive segment b112, and a first transition segment 113 connecting the first conductive segment a111 and the first conductive segment b112. A pair of first conductive clamps 13 are provided on the first conductive segment a111, and a plurality of first fastener through holes b16 are provided on the first conductive segment b112. Further, one end of each of the two first conductive clamps 13 is fixed to the first conductive bus body 11, and the other end of each of the two first conductive clamps 13 is provided with a through hole for a screw to pass through. The through holes on the two first conductive clamps 13 are coaxially arranged, so that the screw can pass through the through holes on the two first conductive clamps 13 in sequence and be locked by a nut, so that the two first conductive clamps 13 are clamped on the moving contact 4.

[0070] In this embodiment, the first conductive bus body 11 and the first conductive clamp 13 are integrally formed. In other embodiments, the first conductive clamp 13 can also be connected to the first conductive bus body 11 by screws or welding.

[0071] Continue to refer to Figure 5 In this embodiment, a portion of the plurality of first heat sinks 12 are first heat sinks b122, and the plurality of first heat sinks b122 are arranged in a straight line. Specifically, the plurality of first heat sinks 12 are divided into two parts, one part being a first heat sink a121 and the other part being a first heat sink b122. The first heat sinks b122 are arranged in a straight line on one side of the first heat sink a121 to increase the heat dissipation effect.

[0072] Reference Figure 6In this embodiment, the second conductive bus body 21 is straight. One end of the second conductive bus body 21 is provided with several second fastener through holes a25. The fourth end of the stationary contact 5 is provided with a second threaded hole corresponding to each second fastener through hole a25. The second conductive bus 2 and the stationary contact 5 are fixed through the matching second fastener through holes a25 and second threaded holes. Further, there is only one second fastener through hole a25, and a second heat sink a221 is arranged around it. The other end of the second conductive bus body 21 is provided with several second fastener through holes b26, through which the second conductive bus body 21 is connected to external circuitry.

[0073] Continue to refer to Figure 6 In this embodiment, a portion of the plurality of second heat sinks 22 are second heat sinks b222, and the plurality of second heat sinks b222 are arranged in a straight line. Specifically, the plurality of second heat sinks 22 are divided into two parts, one part being a second heat sink a221 and the other part being a second heat sink b222. The second heat sinks b222 are arranged in a straight line on one side of the second heat sink a221 to increase the heat dissipation effect.

[0074] In this embodiment, the first conductive bus body 11 and each of the first heat sinks 12 are integrally formed, and the second conductive bus body 21 and each of the second heat sinks 22 are integrally formed. By setting the conductive bus as an integral conductive metal structure, its installation process can be simplified.

[0075] It is understandable that the positions of the first conductive busbar 1 and the second conductive busbar 2 can be interchanged, that is, the first conductive busbar 1 is installed at the fourth end of the stationary contact 5, and the second conductive busbar 2 is installed at the second end of the moving contact 4.

[0076] Example 2

[0077] Reference Figure 7 In this embodiment, both the first conductive busbar 1 and the second conductive busbar 2 are U-shaped, and the rest of the structure is the same as in Embodiment 1, so it will not be described again here.

[0078] Example 3

[0079] Reference Figure 8 and Figure 9 In this embodiment, both the first conductive busbar 1 and the second conductive busbar 2 are straight strips.

[0080] The first conductive bus body 11 has several first fastener through holes a15 and several first fastener through holes b16 at both ends. The second end of the moving contact 4 is provided with a first threaded hole corresponding to each first fastener through hole a15. The first conductive bus 1 and the moving contact 4 are connected and fixed through the matching first fastener through holes a15 and first threaded holes.

[0081] In some embodiments, the first conductive bus body 11 is provided with a first insertion hole 14 that is fitted onto the second end of the moving contact 4. The first insertion hole 14 can be a through hole or a blind hole. In this embodiment, the first insertion hole 14 is a blind hole, and a plurality of first fastener through holes a15 are formed at the bottom of the first insertion hole 14.

[0082] Similar to the above scheme, the two ends of the second conductive bus body 21 are respectively provided with a number of second fastener through holes a25 and a number of second fastener through holes b26. The fourth end of the stationary contact 5 is provided with a second threaded hole corresponding to each second fastener through hole a25. The connection and fixation of the second conductive bus 2 and the stationary contact 5 are realized through the matching second fastener through holes a25 and second threaded holes.

[0083] In some embodiments, the second conductive bus body 21 is provided with a second insertion hole 24 that is fitted onto the fourth end of the stationary contact 5. The second insertion hole 24 can be a through hole or a blind hole. In this embodiment, the second insertion hole 24 is a blind hole, and a plurality of second fastener through holes a25 are formed at the bottom of the first insertion hole 14.

[0084] The cross-section of the aforementioned insertion hole can be circular or polygonal (such as triangle, rectangle, hexagon, etc.), which serves to limit the position of the conductor bus body relative to the contact and increase the contact area between the conductor bus body and the contact.

[0085] The remaining structure of this embodiment is the same as that of Embodiment 1, and will not be described again here.

[0086] Example 4

[0087] Reference Figure 10 In this embodiment, each first heat sink 12 is spliced ​​onto the first conductive bus body 11. Specifically, each first heat sink 12 is fixed to a first support plate, which has through holes for screws to pass through. The first support plate is fixed to the first conductive bus body 11 through these through holes and screws passing through them. The materials of the first heat sink 12 and the first support plate can be the same as or different from the material of the first conductive bus body 11; preferably, the materials of the first heat sink 12 and the first support plate are metals with excellent thermal conductivity, such as silver or copper.

[0088] The second conductive busbar 2 can also be configured as a spliced ​​structure. For example, each second heat sink 22 is fixed on a second support plate, and the second support plate is fixed to the main body 21 of the second conductive busbar by screws.

[0089] The remaining structure of this embodiment is the same as that of Embodiment 1, and will not be described again here.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A contact system for a vacuum circuit breaker, comprising a vacuum bulb (3), a moving contact (4), and a stationary contact (5), wherein the moving contact (4) has a first end and a second end, and the stationary contact (5) has a third end and a fourth end, wherein the first end of the moving contact (4) and the third end of the stationary contact (5) are both located within the vacuum bulb (3), and the second end of the moving contact (4) and the fourth end of the stationary contact (5) both extend out from the vacuum bulb (3), characterized in that, It also includes a first conductive bus (1) and a second conductive bus (2), wherein: The first conductive bus (1) is connected to the second end of the moving contact (4), and includes a first conductive bus body (11) and a plurality of first heat sinks (12) disposed on the first conductive bus body (11), wherein at least a portion of the plurality of first heat sinks (12) are first heat sinks a (121). The second conductive bus (2) is connected to the fourth end of the stationary contact (5), and includes a second conductive bus body (21) and a plurality of second heat sinks (22) disposed on the second conductive bus body (21), wherein at least a portion of the plurality of second heat sinks (22) is a second heat sink a (221). The plurality of first heat sinks a (121) and the plurality of second heat sinks a (221) are arranged in a ring or arc shape with the moving contact (4) as the center line.

2. The contact system of the vacuum circuit breaker according to claim 1, characterized in that, A portion of the plurality of first heat sinks (12) are first heat sinks b (122), and the plurality of first heat sinks b (122) are arranged in a straight line; And / or, a portion of the plurality of second heat sinks (22) are second heat sinks b (222), and the plurality of second heat sinks b (222) are arranged in a straight line.

3. The contact system of the vacuum circuit breaker according to claim 1, characterized in that, The first heat sink (12) is provided on the side of the first conductive bus body (11) that is close to the vacuum bubble (3) and / or on the side that is away from the vacuum bubble (3). And / or, the second heat sink (22) is provided on the side of the second conductive bus body (21) near the vacuum bubble (3) and / or on the side away from the vacuum bubble (3).

4. The contact system of the vacuum circuit breaker according to claim 1, characterized in that, The first conductive bar (1) includes a pair of first conductive clamps (13), which are used to clamp the second end of the moving contact (4); Alternatively, the first conductive bus (1) includes a plurality of first fastener through holes a (15), and the second end of the moving contact (4) is provided with a first threaded hole corresponding one-to-one with the plurality of first fastener through holes a (15), and a corresponding set of first fastener through holes a (15) and first threaded holes are connected to each other by fasteners.

5. The contact system of the vacuum circuit breaker according to claim 1, characterized in that, The second conductive bar (2) includes a pair of second conductive clamps (23), which are used to clamp the fourth end of the stationary contact (5); Alternatively, the second conductive bus (2) includes a plurality of second fastener through holes a (25), and the fourth end of the stationary contact (5) is provided with a second threaded hole corresponding one-to-one with the plurality of second fastener through holes a (25), and a corresponding set of second fastener through holes a (25) and second threaded holes are connected to each other by fasteners.

6. The contact system of the vacuum circuit breaker according to claim 1, characterized in that, The first conductive bus body (11) has several first fastener through holes for screws to pass through; And / or, the second conductive bus body (21) has a plurality of second fastener through holes for screws to pass through.

7. The contact system of the vacuum circuit breaker according to claim 1, characterized in that, The first conductive bus body (11) is U-shaped and includes a first conductive segment a (111), a first conductive segment b (112) and a first transition segment (113) connected between the first conductive segment a (111) and the first conductive segment b (112). The first conductive segment a (111) is connected to the moving contact (4). The first conductive segment b (112) is provided with the first heat sink (12) and the first conductive segment b (112) is connected to an external circuit. Alternatively, the first conductive bus body (11) is in the shape of a straight strip, and the two ends of the first conductive bus body (11) are respectively connected to the moving contact (4) and the external circuit.

8. The contact system of the vacuum circuit breaker according to claim 1, characterized in that, The second conductive bus body (21) is U-shaped and includes a second conductive section a, a second conductive section b and a second transition section connected between the second conductive section a and the second conductive section b. The second conductive section a is connected to the stationary contact (5), the second conductive section b is provided with the second heat sink (22), and the second conductive section b is connected to the external circuit. Alternatively, the second conductive bus body (21) is in the shape of a straight strip, and the two ends of the second conductive bus body (21) are respectively connected to the stationary contact (5) and the external circuit.

9. The contact system of the vacuum circuit breaker according to claim 1, characterized in that, The first conductive bus body (11) and each of the first heat sinks (12) are integrally formed; Alternatively, each of the first heat sinks (12) is spliced ​​onto the first conductive bus body (11).

10. The contact system of the vacuum circuit breaker according to claim 1, characterized in that, The second conductive bus body (21) and each of the second heat sinks (22) are integrally formed; Alternatively, each of the second heat sinks (22) is spliced ​​onto the second conductive bus body (21).

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