WO2023017416A1

WO2023017416A1 - Vacuum circuit breaker

Info

Publication number: WO2023017416A1
Application number: PCT/IB2022/057417
Authority: WO
Inventors: 张华夏; 郑荣; 陈建华; 李兴伟
Original assignee: 伊顿电气有限公司
Priority date: 2021-08-09
Filing date: 2022-08-09
Publication date: 2023-02-16
Also published as: CN215988571U

Abstract

The present utility model relates to a vacuum circuit breaker. The vacuum circuit breaker comprises an operating mechanism (2). The vacuum circuit breaker further comprises a plurality of vacuum interrupter modules (3). The operating mechanism (2) is in driving connection with the plurality of vacuum interrupter modules (3). Each vacuum interrupter module (3) comprises: a housing (4); a vacuum interrupter chamber (6), accommodated inside the housing, and provided with a static contact and a moving contact oppositely arranged; a contact support assembly (7), accommodated inside the housing and connected to the moving contact in the vacuum interrupter chamber (6). The operating mechanism (2) is in driving connection with the contact support assembly (7). The inner wall of the housing is matched with the vacuum interrupter chamber (6) and the contact support assembly (7) to form a concave-convex structure, and is formed with connection openings corresponding to the static contact, the moving contact and the contact support assembly (7).

Description

Vacuum Circuit Breaker Technical Field

[0001] The utility model relates to the technical field of control and protection of electrical equipment, in particular to a vacuum circuit breaker. Background technique

In new energy wind power industry, the product requirement of low-voltage circuit breaker has been upgraded to the working voltage of AC1150V/1500V, also requires circuit breaker to possess the performance of high life-span simultaneously. In addition, in high-pollution industries such as coal mines and oil and gas, it is also hoped that circuit breaker products can achieve zero flashover to ensure the safety of operators, circuits and electrical equipment in flammable and explosive environments.

Therefore, there is demand in the industry to the circuit breaker product of high life-span, zero flashover, hope this circuit breaker product simultaneously has as little floor area as possible. Utility model content

[0004] The utility model aims to provide a vacuum circuit breaker that can at least solve some of the above-mentioned technical problems.

[0005] According to one aspect of the present invention, a vacuum circuit breaker is provided, including an operating mechanism, the vacuum circuit breaker also includes a plurality of vacuum arc extinguishing modules, and the operating mechanism is connected to each vacuum arc extinguishing module by driving, The vacuum interrupter module includes: a housing; a vacuum interrupter housed in the housing and having fixed contacts and moving contacts oppositely arranged; a contact support assembly housed in the housing and connected to the The moving contact of the vacuum interrupter, wherein the operating mechanism is driven to connect the contact support assembly; the inner wall of the housing is adapted to the vacuum interrupter and the contact support assembly to form a Concavo-convex structure, and corresponding to the fixed contact, the movable contact and the contact support assembly, a connection opening is formed.

[0006] In some embodiments, each vacuum interrupter module has a link mechanism connected to the contact support assembly, the operating mechanism drives the link mechanism connected to each vacuum interrupter module, and the connection of the housing The opening includes a first connection opening through which the link mechanism passes.

[0007] In some embodiments, the static contact of the vacuum interrupter is connected with a first connection terminal, and the connection opening of the housing includes a second connection opening aligned with the first connection terminal .

In some embodiments, a coil is arranged at the first connecting terminal, the inner wall of the housing has a groove for accommodating the coil, and the second connection opening is formed at the bottom of the groove.

[0009] In some embodiments, the moving contact of the vacuum interrupter is connected to a second terminal through a soft connection, and the connection opening of the housing includes a first terminal aligned with the second terminal. Three connection openings.

[0010] In some embodiments, the inner wall of the housing is formed with a ring extending along the circumference of the housing, and the vacuum interrupter is surrounded by the ring.

[0011] In some embodiments, the housing includes at least two shell parts that are detachably connected, and the concave-convex structure is surrounded by the at least two shell parts.

[0012] In some embodiments, the vacuum interrupter module is prefabricated.

[0013] In some embodiments, the contact support assembly includes: a bracket; a contact spring, which is supported by the bracket; a movable part, which is coupled to the contact spring and has a wear indicator; a rod connected to the movable member and connected at the end to the movable contact of the vacuum interrupter;

[0014] The position of the movable member relative to the connecting rod is arranged so that during the closing of the movable contact and the static contact The position change of the wear indicating part can be identified when the moving contact and/or the static contact reach a predetermined value of wear thickness.

[0015] In some embodiments, the movable part also has an installation indicator, and the installation indicator is far away from the bracket relative to the wear indicator.

A part of other features and advantages of the present utility model will be apparent to those skilled in the art after reading this application, and another part will be described in conjunction with accompanying drawing in the detailed description below. Description of drawings

Below, describe the embodiment of the present utility model in detail in conjunction with accompanying drawing, wherein:

Fig. 1 is a schematic diagram of a vacuum circuit breaker according to the present invention;

Fig. 2 is a side view of the vacuum circuit breaker according to the utility model;

Fig. 3 is an exploded schematic view of the vacuum circuit breaker according to the present invention;

Fig. 4 is a schematic diagram of the vacuum arc extinguishing module according to the present invention;

Fig. 5 is a side view of the vacuum interrupter module according to the present invention;

Fig. 6 is an exploded schematic view of the vacuum interrupter module according to the present invention;

[0024] FIG. 7 is an exploded schematic view of the contact support assembly according to the present invention.

Description of reference numerals

1, vacuum circuit breaker; 2, operating mechanism; 21, main shaft; 22, crank arm; 3, vacuum interrupter module; 4, shell; 41, first shell part; 411, first connection opening; 412, Assembly hole; 42, second shell part; 421, second connection opening; 422, third connection opening; 423, ring; 424, assembly hole; 425, groove; 426, protrusion; 5, coil; 6, Vacuum interrupter; 61. First terminal; 62. Soft connection; 7. Contact support assembly; 71. Connecting shaft; 72. Bracket; 73. Connecting rod; 731. End; 732. Flange; 74. First insulating pad; 75. Movable parts; 751. Installation indicating part; 752. Wear indicating part; 76. Second insulating pad; 77. Sleeve; 78. Contact spring; 79. Insulating sleeve; 8. Linkage ; 81, first shot; 82, second shot; 83, third shot. Detailed ways

[0027] Referring now to the accompanying drawings, the schematic scheme of the vacuum circuit breaker disclosed in the utility model will be described in detail. Although the drawings are provided to illustrate some embodiments of the invention, the drawings are not necessarily to scale of particular embodiments and certain features may be exaggerated, removed, or partially sectioned to better illustrate and explain the invention. New type of public content. Some components in the drawings can be adjusted according to actual needs without affecting the technical effect. Appearances of the phrase "in the drawings" or similar terms in the specification do not necessarily refer to all drawings or examples.

[0028] Certain directional terms used hereinafter to describe the drawings, such as "inner", "outer", "above", "below" and other directional terms, are to be understood to have their normal meanings and refer to Those directions are involved in normal viewing of the drawings. Unless otherwise specified, the directional terms described in this specification basically follow the conventional directions understood by those skilled in the art.

The terms "first", "first", "second", "second" and similar terms used in the utility model do not represent any order, quantity or importance, but is used to distinguish one part from other parts.

[0030] FIGS. 1 to 3 show schematic diagrams of a vacuum circuit breaker 1 according to the present invention. As shown in the figure, a vacuum circuit breaker 1 includes an operating mechanism 2 and a plurality of vacuum interrupter modules 3 driven by the operating mechanism 2 to realize opening and closing. Three vacuum interrupter modules 3 are shown in the figure, but those skilled in the art will understand that the vacuum interrupter modules 3 are prefabricated and can be installed in the vacuum circuit breaker When installing on site in the working environment, a desired number of prefabricated vacuum interrupter modules 3 are connected to the operating mechanism 2 in parallel according to needs, and the number can be 2 or more, for example 4, 5, 6 or more.

Referring to Fig. 1 and Fig. 3, the main shaft 21 of the operating mechanism 2 can be operated to rotate around its own central axis, thereby driving the linkage mechanism 8 of each vacuum arc extinguishing module 3 connected to the main shaft 21 to drive each vacuum arc extinguishing The dynamic and static contacts of chamber 3 are closed or separated. In the illustrated embodiment, the main shaft 21 of the operating mechanism 2 is covered with a crank arm 22, and the rotation of the main shaft 21 can drive the crank arm 22 to rotate synchronously. The crank arm 22 is pivotally connected to the first rod 81 of the link mechanism 8, the first rod 81 is pivotally connected to the second rod 82, the second rod 82 is pivotally connected to the third rod 83, and the third rod 83 is pivoted from the lower part Connected to the contact support assembly 7 of the vacuum interrupter 6 (will be described in detail below), so as to control the separation or closure of the dynamic and static contacts in the vacuum interrupter 6 . The structure of the operating mechanism 2 and its control on the main shaft 21 can refer to the existing technology, and will not be repeated here.

[0032] FIG. 4 to FIG. 6 schematically show an example of a vacuum interrupter module 3 according to the present invention. As shown in the figure, in the vacuum interrupter module 3, the vacuum interrupter 6 and the contact support assembly 7 are packaged in the housing 4, and the inner wall of the housing 4 is formed with a concave-convex structure to fit the accommodated components. In order to facilitate the installation of the vacuum interrupter and the contact support assembly 7, the housing 4 is assembled from two or more shell parts. In the illustrated embodiment, the case 4 composed of two shell parts, namely the first shell part 41 and the second shell part 42 is taken as an example for description. Based on the direction in which the vacuum circuit breaker 1 and the vacuum interrupter module are normally placed as shown in Figures 1 and 3, the first shell part 41 and the second shell part 42 can also be regarded as a front shell part and a rear shell part. As shown in FIG. 5, the first shell part 41 and the second shell part 42 respectively form corresponding assembly holes 412, 424 for easy assembly. After the first shell part 41 and the second shell part 42 are spliced together, the first shell part 41 and the second shell part 42 are assembled together by inserting connectors such as bolts or pins in the aligned assembly holes 412, 424. .

[0033] The first shell part 41 and the second shell part 42 can be integrally formed of plastic materials. In order to facilitate the correct assembly of the first shell part 41 and the second shell part 42, the first shell part and the second shell part can be formed with a suitable concave-convex positioning structure, for example, a protrusion is formed on the first shell part, while the second shell part The shell portion forms a recess capable of receiving the protrusion. Conversely, it is also possible to form the protrusion on the second case part and form the recess on the first case part.

[0034] The vacuum interrupter 6 and the contact support assembly 7 are accommodated in the housing 4. The vacuum interrupter 6 includes a housing and moving contacts and static contacts (not shown in the figure) accommodated in the housing. The contact support assembly 7 is connected to the moving contact, and the operating mechanism 2 can operate the contact support assembly 7 through the link mechanism 8, and then drive the moving contact closer to or away from the fixed contact. For example, the first shell part 41 of the housing 4 is formed with a first connection opening 411 at a position corresponding to the contact support assembly 7, for the third rod 83 of the link mechanism 8 to pass through and connect to the contact support assembly 7.

[0035] FIG. 7 shows an example of a contact support assembly 7. As shown in the figure, in the contact support assembly 7, the connecting shaft 71 is installed on the bracket 72. The connecting shaft 71 is pivotally connected to the third rod 83 of the link mechanism 8. The sleeve 77 is supported on the bracket 72, and a contact spring 78 is arranged in the sleeve 77. The contact spring 78 supports the movable part 75, and provides the movable part 75 with a thrust in the direction away from the bracket 72 (ie, toward the moving contact in the vacuum interrupter). The connecting rod 73 passes through the bracket 72, the contact spring 78 and the movable part 75, and the connecting rod 73 is connected with the movable part 75. After assembly, the connecting rod 73 and the movable part 75 cannot move relative to each other, or at least the movable part 75 cannot move along the axial direction of the connecting rod 73, so that the movement of the movable part 75 (under the thrust of the contact spring 78) drives the connecting rod 75. The rods 73 move synchronously.

[0036] One end of the connecting rod 73 protrudes from the side of the bracket 72 facing away from the sleeve 77, and a flange 732 is provided at this end. The size of the flange 732 is larger than the opening of the support 72 for the connecting rod 73 to pass through, which can prevent the connecting rod 73 from deviating from the support 72 during the movement process. The other end of the connecting rod 73 protrudes from the side of the movable member 75 facing away from the bracket 72, and serves as an end 731 for connecting to the moving contact in the vacuum interrupter 6.

[0037] In one embodiment, the connecting rod 73 is a screw rod, and the flange 732 is a nut threadedly engaged on the connecting rod 73. The movable part 75 adaptively has an internal thread that cooperates with the external thread of the screw rod, so that during the assembly process, the movable part can adjust its position along the axial direction of the connecting rod 73, and this adjustment is continuous, and can be adjusted to a suitable position The rear is positioned relative to the connecting rod 73. In yet another embodiment, the movable part can be sleeved on the connecting rod in a tight fit.

[0038] An installation indicating portion 751 and a wear indicating portion 752 are formed on the outer periphery of the movable member 75. In the illustrated embodiment, the installation indicating portion 751 and the wear indicating portion 752 are each configured as an indicating line extending along the circumferential direction of the movable member 75. The installation indicating part 751 is closer to the end 731 of the connecting rod 73 for connecting the moving contact than the wear indicating part 752. In other embodiments, the installation indicating part 751 and the wear indicating part 752 can have other forms, such as pattern identification, text identification, scale identification, color identification, or a combination of at least two of these forms.

[0039] The connecting rod 73 is also sleeved with an insulating sleeve 79. In the illustrated embodiment, the insulating sleeve 79 can be sleeved on the connecting rod 73 by using a heat-shrinkable tube, and passes through the bracket 72 and the contact spring 78. In other embodiments, the insulating sleeve can be sleeved on the connecting rod 73 and a radially extending flange is formed near one end, the insulating sleeve passes through the bracket 72 and the contact spring 78, and extends radially The flange of the bracket is dropped on the bracket, so that the bracket supports the insulating sleeve. A first insulating pad 74 can also be provided between the side of the bracket 72 facing away from the sleeve 77 and the flange 732 on the connecting rod 73, and the first insulating pad 74 is sleeved on the connecting rod 73. In addition, a second insulating pad 76 may be arranged on the side of the movable member 75 facing the contact connection end 421 of the connecting rod 73, and the second insulating pad 76 is sleeved on the connecting rod 73.

In the case of initial normal assembly (the dynamic and static contacts in the vacuum interrupter are not worn), when the movable contact and the static contact in the vacuum interrupter are closed, the installation indicating part 751 of the movable part 75 is exposed on the Outside the sleeve 77, the operator judges that the contact support assembly 7 is installed correctly based on seeing or detecting the installation indicating part 751, and then determines the movement stroke of the contact spring. At this time, the wear indicating portion 752 cannot be seen or detected by the operator because it is located in the sleeve 77.

And once the moving and static contacts wear and tear, when the moving contacts and static contacts in the vacuum interrupter 6 are closed, the movable part 75 makes the installation indicator 751 away from the cover due to the larger stroke of the connecting rod 73 The upper edge of the barrel 77, while the wear indicator portion 752 is exposed outside the sleeve 77, the operator can recognize the position change of the wear indicator portion (relative to the sleeve) based on the wear indicator portion 752 can be seen or detected, so that Judging that the wear thickness of the dynamic and static contacts has reached the predetermined value.

As mentioned above, the moving contacts of the vacuum interrupter 6 are connected and driven by the contact support assembly 7, while the fixed contacts are connected to the first terminal 61, and the coil 5 is arranged at the first terminal 61 . As shown in FIG. 6, the coil 5 surrounds a part of the first terminal 61, and this part of the first terminal 61 is close to the inner wall of the second case part 42 of the case 4. The housing 4 is, for example, formed with a second connection opening 421 at a position corresponding to the first connection terminal 61 on the second case part 42, for cables to pass through and be connected to the first connection terminal 61.

[0043] As shown in FIG. 6, adapted to surround the coil 5 of the first terminal 61, the second shell portion 42 of the housing 4 is formed with a groove 425 on the inner wall to accommodate the coil. The shape of the groove can be adapted to the shape of the coil 5, so that the coil 5 can be more firmly assembled in the housing 4. The second connection opening 421 is correspondingly formed at the bottom of the groove 425.

[0044] In addition to being connected to the first terminal with the static contact, the vacuum interrupter 6 is also connected with the second terminal (not shown in the figure) through the soft connection 62 with the movable contact. The flexible connection 62 can be sleeved on the connecting rod 73 of the contact support assembly 7. The housing 4 is, for example, formed with a third connection opening 422 on the second shell part 42 at a position corresponding to the soft connection, for the second terminal or cable to pass through and be connected to the soft connection 62. In the illustrated embodiment, the second shell portion 42 may be formed with a protrusion 426 protruding toward the soft connection 63 at a position corresponding to the third connection opening 422, the third connection opening 422 penetrates the protrusion 426, and the third connection opening 422 penetrates the protrusion 426, and the second Two connection terminals can be placed in the third connection opening 422 and connected to the soft connection 62 .

[0045] In order to stably keep the vacuum interrupter 6 in the housing 4, the inner wall of the housing 4 also integrally forms a raised ring 423, which extends along the circumference of the housing 4. The side of the ring 423 towards the vacuum interrupter 6 is the outer surface of the vacuum interrupter. Concave curved surface adapted to the surrounding surface. The vacuum interrupter is surrounded and clamped by a ring so as to be restricted from lateral movement. According to the illustrated embodiment, the ring can be formed after the shell parts of the housing 4 are assembled together. For example, as shown in FIG. 6, each of the first case portion 41 and the second case portion 42 is integrally formed with a half circle, and they are assembled to form a full circle.

The utility model prepackages a series of parts such as the vacuum interrupter and the support assembly in the frame-type shell to prefabricate a single small-volume vacuum interrupter module unit, while retaining the zero-flying of the vacuum interrupter characteristics of the arc. Each modular unit is small in size and neat in appearance. After the required number of vacuum interrupter module units are connected in parallel to one operating mechanism, the overall structure of the vacuum circuit breaker is compact and takes up little space, and because the vacuum interrupter module units are prefabricated units, the assembly of the field and the operating mechanism is also saved. Time-saving and labor-saving, the safety performance is also very good.

It should be understood that although this specification is described according to various embodiments, not every embodiment only includes an independent technical solution, and this narration mode of specification is only for clarity, and those skilled in the art should understand specification As a whole, the technical solutions in the various embodiments can also be properly combined to form other implementations that can be understood by those skilled in the art.

The above is only the specific embodiment of the utility model schematically, not in order to limit the scope of the utility model. Any equivalent change, modification and combination made by any person skilled in the art without departing from the concept and principles of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A vacuum circuit breaker, comprising an operating mechanism (2), characterized in that the vacuum circuit breaker (1) also includes a plurality of vacuum arc extinguishing modules (3), and the operating mechanism (2) is drivingly connected to each vacuum interrupter The arc module (3), the vacuum arc extinguishing module (3) includes: a housing (4); a vacuum interrupter (6), which is accommodated in the housing (4) and has a static contact and a moving contact arranged oppositely; a contact support assembly (7), accommodated in the housing (4) and connected to the moving contact of the vacuum interrupter (6), wherein the operating mechanism (2) is drivingly connected to the contact support assembly (7) ; The inner wall of the housing (4) is adapted to the vacuum interrupter (6) and the contact support assembly (7) to form a concave-convex structure, which corresponds to the static contact, the moving contact and the contact The support assembly (7) is formed with connection openings.

2. The vacuum circuit breaker according to claim 1, characterized in that each vacuum interrupter module (3) has a linkage mechanism (8) connected to the contact support assembly (7), and the operating mechanism (2) is drivingly connected to each The link mechanism (8) of the vacuum interrupter module (3), the connection opening of the housing (4) includes a first connection opening (411) through which the link mechanism (8) passes.

3. The vacuum circuit breaker according to claim 1, characterized in that, the static contact of the vacuum interrupter (6) is connected to a first connection terminal (61), and all the terminals of the housing (4) The connection opening includes a second connection opening (421) aligned with the first connection terminal (61) o

4. The vacuum circuit breaker according to claim 3, characterized in that, a coil (5) is arranged at the first connection terminal (61), and the inner wall of the housing (4) has a groove (425) for accommodating the coil (5) , the second connection opening (421) is formed at the bottom of the groove (425).

5. The vacuum circuit breaker according to claim 1, characterized in that, the moving contact of the vacuum interrupter (6) is connected to a second connection terminal through a soft connection (62), and the casing (4 ) includes a third connection opening (422) aligned with the second connection terminal o

6. The vacuum circuit breaker according to claim 1, characterized in that, the inner wall of the housing (4) is formed with a ring (423) extending along the circumference of the housing (4), and the vacuum interrupter (6) Surrounded by said ring (423).

7. The vacuum circuit breaker according to claim 1, characterized in that, the housing (4) includes at least two shell parts that are detachably connected, and the concave-convex structure is formed by surrounding the at least two shell parts .

8. The vacuum circuit breaker according to claim 1, characterized in that, the vacuum interrupter module (3) is prefabricated.

9. The vacuum circuit breaker according to claim 1, characterized in that, the contact supporting assembly (7) comprises: a bracket (72); a contact spring (78), which is supported by the bracket (72); a movable part (75), which is follower engaged to said contact spring (78) and has a wear indicator (752); to the movable contact of the vacuum interrupter (6); the position of the movable member (75) relative to the connecting rod (73) is arranged so that when the movable contact is engaged with the static contact The position change of the wear indication part (752) can be identified when the movable contact and/or the static contact reaches a predetermined value of wear thickness during braking.

10. The vacuum circuit breaker according to claim 9, characterized in that, the movable part (75) also has an installation indicating part (751), and the installation indicating part (751) is opposite to the wear indicating part (752 ) away from the bracket (72).

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