Indoor vacuum circuit breaker

Abstract

The utility model discloses an indoor vacuum circuit breaker, which comprises a chassis truck and a circuit breaker main body arranged at the top of the chassis truck, the circuit breaker main body is provided with a contact arm, the outer side of the contact arm is provided with a convex ring, one end of the contact arm is provided with a tulip contact, and the tulip contact comprises a plurality of contact pieces which are annularly distributed at equal intervals. Two first fixing rings and two second fixing rings are movably arranged on the outer sides of the plurality of contact pieces respectively, a plurality of L-shaped rods are fixedly connected between the two second fixing rings, a first positioning ring is arranged at one end of each L-shaped rod, a plurality of connecting rods are fixedly connected between the two first fixing rings, a second positioning ring is arranged at one end of each connecting rod, and a second positioning ring is arranged at the other end of each connecting rod. According to the utility model, the plurality of springs are arranged, so that a single contact piece can bear force independently applied by the plurality of springs, and compared with the force applied by a traditional annular spring, the force application is more uniform, thereby ensuring good contact between the contact piece and the static contact.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, specifically to an indoor vacuum circuit breaker. Background Technology

[0002] Indoor vacuum circuit breakers have the functions of breaking and closing load current, overload current, and short-circuit current. They are suitable for switching various types of loads and for places with frequent operation. They can be used for the protection and control of electrical facilities in mines, enterprises, power plants, and substations.

[0003] The contacts on the existing indoor vacuum circuit breaker arms are usually made of pentagonal shapes. A ring spring is installed on the pentagonal contact to ensure that there is sufficient contact pressure between the pentagonal contact and the stationary contact. However, the pressure applied by the ring spring is not uniform, which leads to poor contact between some contacts on the pentagonal contact and the stationary contact. This increases the contact resistance, which not only affects the current transmission effect, but also generates more heat. The contact temperature is prone to being too high, and long-term high temperature will accelerate the aging and damage of the contact pieces. Utility Model Content

[0004] The purpose of this invention is to provide an indoor vacuum circuit breaker to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an indoor vacuum circuit breaker, comprising a chassis vehicle and a circuit breaker body mounted on the top of the chassis vehicle. The circuit breaker body is provided with a contact arm, and a convex ring is provided on the outer side of the contact arm. A staggered contact is installed at one end of the contact arm. The staggered contact includes multiple contact pieces distributed in an annular pattern at equal intervals. Two first fixing rings and two second fixing rings are movably provided on the outer side of the multiple contact pieces respectively. Multiple L-shaped rods are fixedly connected between the two second fixing rings. A first positioning ring is provided at one end of the multiple L-shaped rods. Multiple connecting rods are fixedly connected between the two first fixing rings. A second positioning ring is provided at one end of the multiple connecting rods. Multiple first grooves are evenly formed circumferentially on the inner sides of the two first fixing rings and the two second fixing rings. A first limiting rod is provided inside the multiple first grooves. Second grooves corresponding to the first grooves are formed on the outer side of the multiple contact pieces. A second limiting rod is provided inside the second grooves. A spring is sleeved between adjacent second limiting rods and first limiting rods.

[0006] In a preferred embodiment of this utility model, both the first positioning ring and the second positioning ring are located inside the contact piece, and the contact piece and the first and second positioning rings are movably connected.

[0007] As a preferred embodiment of this utility model, multiple notches are provided on the outer sides of both the second positioning ring and the first positioning ring.

[0008] As a preferred embodiment of this utility model, the inner side of the contact piece is provided with a first slot that cooperates with the first positioning ring, and the inner side of the contact piece is also provided with a second slot that cooperates with the second positioning ring.

[0009] As a preferred embodiment of this utility model, the inner side of the contact piece is provided with a protrusion.

[0010] As a preferred embodiment of this utility model, the second fixing ring, the L-shaped rod and the first positioning ring are integrally formed, and the first fixing ring, the connecting rod and the second positioning ring are integrally formed.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: By setting multiple springs, this utility model enables each contact piece to be subjected to the force applied by multiple springs individually. Compared with the force applied by the traditional ring spring, the force is applied more evenly, thereby ensuring good contact between the contact piece and the stationary contact. Furthermore, the first groove, the first limiting rod, the second groove, and the second limiting rod set by the utility model limit the spring, preventing the spring from deviating and ensuring that the force of the spring can be applied to the contact piece in the correct direction. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0013] Figure 2 This is a schematic diagram of the structure of the plum blossom contact of this utility model;

[0014] Figure 3 This is an exploded view of the plum blossom contact of this utility model;

[0015] Figure 4 This is a schematic diagram of the structure of the second fixing ring and the first positioning ring of this utility model;

[0016] Figure 5 This is a schematic diagram of the structure of the first fixing ring and the second positioning ring of this utility model;

[0017] Figure 6 This is a schematic diagram of the contact piece of this utility model;

[0018] Figure 7 This is a schematic diagram of the structure of the plum blossom contact of this utility model when it is not installed;

[0019] Figure 8 This utility model Figure 7 Enlarged view of point A in the middle.

[0020] In the diagram: 1. Chassis vehicle; 2. Circuit breaker body; 3. Contact arm;

[0021] 4. Plum blossom contact; 41. Contact piece; 42. First retaining ring; 43. Second retaining ring; 44. Connecting rod; 45. L-shaped rod; 46. Spring; 47. First positioning ring; 48. Second positioning ring;

[0022] 5. First groove; 6. First limiting rod; 7. Second groove; 8. Second limiting rod; 9. Protrusion; 10. First slot; 11. Second slot; 12. Notch; 13. Protruding ring. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figures 1 to 8This utility model provides a technical solution: an indoor vacuum circuit breaker, including a chassis 1 and a circuit breaker body 2 mounted on the top of the chassis 1. The circuit breaker body 2 has a contact arm 3, with a protruding ring 13 on the outer side of the contact arm 3. One end of the contact arm 3 is equipped with a staggered contact 4, which includes multiple contact pieces 41 arranged in a ring at equal intervals. Two first fixing rings 42 and two second fixing rings 43 are movably mounted on the outer side of each contact piece 41. Multiple L-shaped rods 45 are fixedly connected between the two second fixing rings 43. One end of each L-shaped rod 45 is provided with a first positioning ring 47. Multiple connecting rods 44 are fixedly connected between two first fixing rings 42. One end of each connecting rod 44 is provided with a second positioning ring 48. The first fixing ring 42 is fixedly connected to the second positioning ring 48 via the connecting rods 44. The second fixing ring 43 is fixedly connected to the first positioning ring 47 via the L-shaped rod 45. This ensures that the second fixing ring 43 and the first fixing ring 42 do not rotate relative to the contact piece 41, preventing the spring 46 from twisting and improving structural stability. Multiple first grooves 5 are evenly distributed circumferentially on the inner sides of the two first fixing rings 42 and the two second fixing rings 43. A first limiting rod 6 is provided inside each of the multiple first grooves 5. Second grooves 7, corresponding to the first grooves 5, are provided on the outer sides of the multiple contact pieces 41. A second limiting rod 8 is provided inside each of the second grooves 7. The first grooves 5, the first limiting rod 6, the second grooves 7, and the second limiting rod 8 serve to limit the spring 46, preventing it from shifting and ensuring that the force of the spring 46 is applied to the contact piece 41 in the correct direction. A spring 46 is sleeved between the adjacent second limiting rod 8 and the first limiting rod 6. The spring 46 is used to apply a pushing force to the contact piece 41, so that the contact piece 41 can firmly clamp the contact arm 3, preventing the plum blossom contact 4 from separating from the contact arm 3, and also maintaining sufficient contact pressure between the contact piece 41 and the stationary contact. Furthermore, through the multiple springs 46, each contact piece 41 can be subjected to the force applied by multiple springs 46 individually. Compared with the force applied by the traditional ring spring, the force is more uniform, thereby ensuring good contact between the contact piece 41 and the stationary contact.

[0025] The first positioning ring 47 and the second positioning ring 48 are both located inside the contact piece 41, and the contact piece 41 is movable between the first positioning ring 47 and the second positioning ring 48.

[0026] The second positioning ring 48 and the first positioning ring 47 are provided with multiple notches 12 on their outer sides. The notches 12 allow the contact piece 41 to move only along the opening direction of the notch 12 with the second positioning ring 48 or the first positioning ring 47, thus preventing the contact piece 41 from twisting and causing poor contact with the stationary contact.

[0027] The inner side of the contact piece 41 is provided with a first groove 10 that cooperates with the first positioning ring 47. The first groove 10 is used to fit with the notch 12 on the first positioning ring 47. The inner side of the contact piece 41 is also provided with a second groove 11 that cooperates with the second positioning ring 48. The second groove 11 is used to fit with the notch 12 on the second positioning ring 48, thereby limiting the contact piece 41 and making the contact piece 41 more stable when moving.

[0028] The inner side of the contact piece 41 is provided with a protrusion 9, which is used to cooperate with the protruding ring 13. When the plum blossom contact 4 is installed on the contact arm 3, the protrusion 9 will be blocked by the protruding ring 13, thereby preventing the plum blossom contact 4 from separating from the contact arm 3.

[0029] The second fixing ring 43, the L-shaped rod 45 and the first positioning ring 47 are integrally formed, and the first fixing ring 42, the connecting rod 44 and the second positioning ring 48 are integrally formed. The integrally formed structure ensures a firm connection and facilitates manufacturing.

[0030] Specifically, when the contact piece 41 contacts the stationary contact, the contact piece 41 is subjected to the individual thrust of multiple springs 46, which maintains sufficient contact pressure between the contact piece 41 and the stationary contact, ensuring good contact between the contact piece 41 and the stationary contact.

[0031] In the description of this utility model, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "side", "top", "inner", "front", "center", "both ends", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and 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.

[0032] Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "third," or "fourth" may explicitly or implicitly include at least one of those features.

[0033] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An indoor vacuum circuit breaker, comprising a chassis (1) and a circuit breaker body (2) mounted on the top of the chassis (1), wherein the circuit breaker body (2) is provided with a contact arm (3), a protruding ring (13) is provided on the outer side of the contact arm (3), and a stylus contact (4) is installed at one end of the contact arm (3), characterized in that: The plum blossom contact (4) includes multiple contact pieces (41) arranged in a ring at equal intervals. Two first fixing rings (42) and two second fixing rings (43) are movably provided on the outer sides of each contact piece (41). Multiple L-shaped rods (45) are fixedly connected between the two second fixing rings (43). One end of each L-shaped rod (45) is provided with a first positioning ring (47). Multiple connecting rods (44) are fixedly connected between the two first fixing rings (42). One end of each connecting rod (44) is provided with a second positioning ring (47). The positioning ring (48) has multiple first grooves (5) evenly distributed circumferentially on the inner sides of the two first fixing rings (42) and the two second fixing rings (43). Each of the multiple first grooves (5) is provided with a first limiting rod (6). The outer sides of the multiple contact pieces (41) are provided with second grooves (7) corresponding to the first grooves (5). The inner sides of the second grooves (7) are provided with second limiting rods (8). A spring (46) is sleeved between the adjacent second limiting rods (8) and the first limiting rods (6).

2. The indoor vacuum circuit breaker according to claim 1, characterized in that: The first positioning ring (47) and the second positioning ring (48) are both located inside the contact piece (41), and the contact piece (41) is movably connected to the first positioning ring (47) and the second positioning ring (48).

3. An indoor vacuum circuit breaker according to claim 1, characterized in that: Both the second positioning ring (48) and the first positioning ring (47) have multiple notches (12) on their outer sides.

4. An indoor vacuum circuit breaker according to claim 1, characterized in that: The inner side of the contact piece (41) is provided with a first slot (10) that cooperates with the first positioning ring (47), and the inner side of the contact piece (41) is also provided with a second slot (11) that cooperates with the second positioning ring (48).

5. An indoor vacuum circuit breaker according to claim 1, characterized in that: The inner side of the contact piece (41) is provided with a protrusion (9).

6. An indoor vacuum circuit breaker according to claim 1, characterized in that: The second fixing ring (43), the L-shaped rod (45) and the first positioning ring (47) are integrally formed, and the first fixing ring (42), the connecting rod (44) and the second positioning ring (48) are integrally formed.

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