Moving contact assembly and isolating switch

Abstract

The invention relates to the technical field of power transmission and distribution, and discloses a moving contact assembly and an isolating switch, the moving contact assembly comprises a moving side shielding cover, a moving side shielding conductor, a moving side supporting conductor, a moving side contact assembly, a moving contact unit, a watchband contact finger and a transmission unit; the moving side contact assembly is provided with a guide hole along the axial direction, and the moving contact unit is arranged in the guide hole; the transmission unit is arranged outside the movable side shielding conductor, and the output end of the transmission unit extends into the guide hole and is in transmission connection with the movable contact unit; an annular limiting groove is formed in the inner wall of the guide hole in the axial direction, the watchband contact finger is arranged in the annular limiting groove, the watchband contact finger comprises an arc-shaped main body and a flexible connecting plate, and the head and the tail of the arc-shaped main body are connected with the two ends of the flexible connecting plate; the watchband contact finger mounting structure has the beneficial effects that the stability of the watchband contact finger mounting structure is improved, the watchband contact finger is prevented from moving or falling off under the driving of the moving contact unit, and the stability of power transmission is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power transmission and distribution equipment, and in particular to a moving contact assembly and an isolating switch. Background Art

[0002] In order to improve the stability of the power transmission efficiency between the moving contact unit and the moving side contact assembly, the existing moving contact assembly generally arranges a strap contact finger in the moving side contact assembly. The moving contact unit is inserted into the strap contact finger. The moving contact unit can reciprocate along the axial direction of the strap contact finger. The strap contact finger is easily moved or disengaged under the drive of the moving contact unit, resulting in unstable power transmission process. Summary of the invention

[0003] The purpose of the present invention is to provide a moving contact assembly and an isolating switch to improve the stability of the strap contact finger mounting structure, prevent the strap contact finger from moving or falling out under the drive of the moving contact unit, and improve the stability of power transmission.

[0004] In order to achieve the above-mentioned object, the present invention provides a moving contact assembly, including a moving side shielding cover, a moving side shielding conductor, a moving side supporting conductor, a moving side contact assembly, a moving contact unit, a band contact finger and a transmission unit;

[0005] The movable side shielding cover, movable side shielding conductor and movable side supporting conductor are fixedly connected along the axial direction; the movable side contact assembly is arranged in the movable side shielding conductor and is fixedly connected to the movable side shielding conductor; the movable side contact assembly is provided with a guide hole along the axial direction; the movable contact unit is arranged in the guide hole; the transmission unit is arranged outside the movable side shielding conductor, and the output end extends into the guide hole and is transmission-connected with the movable contact unit, so as to drive the movable contact unit to slide axially along the guide hole;

[0006] The inner wall of the guide hole is provided with an annular limiting groove along the axial direction, the watchband contact finger is arranged in the annular limiting groove, the watchband contact finger comprises an arc-shaped body and a flexible connecting plate, and the head and tail of the arc-shaped body are connected to the two ends of the flexible connecting plate;

[0007] Among them, the moving contact unit slides axially along the guide hole, passes through the arc-shaped main body and squeezes the flexible connecting plate, so that the two radially opposite side walls of the flexible connecting plate along the annular limiting groove are deformed from a plane to an arc surface, so that the watchband contact finger is fixed in the annular limiting groove.

[0008] Furthermore, the central angle range of the flexible connecting plate on the circle where the arc-shaped main body is located is 25°-30°.

[0009] Furthermore, the thickness of the flexible connecting plate is 1.5 mm-2.5 mm.

[0010] Furthermore, a plurality of limiting holes are circumferentially opened on the side wall of the moving side shielding conductor, and the axial direction of the plurality of limiting holes is the same as the radial direction of the moving side shielding conductor. The output end of the transmission unit passes through one of the limiting holes and extends to the guide hole to be connected with the moving contact unit.

[0011] Furthermore, the moving contact unit includes a contact cylinder, a moving arc contact, a rack, and a bridge plate. Both ends of the contact cylinder are open, and one end is connected to the moving arc contact, and the other end is provided with the bridge plate. The contact cylinder is axially provided with a rack, and the rack is fixedly connected to the bridge plate. The side wall of the contact cylinder is axially provided with a strip hole, and the output shaft of the transmission unit is provided with a driving gear, and the toothed portion of the driving gear passes through the strip hole and meshes with the rack for transmission.

[0012] Furthermore, a countersunk hole is formed at one end of the contact cylinder toward the moving arc contact, and the moving arc contact is provided with a limiting step corresponding to the countersunk hole, one end surface of the rack is arranged in contact with the limiting step, and the other end surface is arranged in contact with the bridge plate.

[0013] Furthermore, a V-shaped groove is formed on the inner wall of the contact cylinder along the axial direction, and the rack is provided with a limiting portion corresponding to the V-shaped groove.

[0014] Furthermore, there are multiple annular limiting grooves, and the number of the strap contact fingers is the same as that of the annular limiting grooves and their positions correspond.

[0015] The present invention provides an isolating switch, comprising the moving contact assembly described in any one of the above items, and also comprising a static side supporting conductor, a static side shielding conductor, a first shielding cover, a second shielding cover, a static side contact assembly, and a static arc contact unit, wherein the static side supporting conductor, the static side shielding conductor, and the first shielding cover are arranged in sequence from far to near toward the moving contact unit, a static side contact assembly is fixedly provided in the first shielding cover, the static side contact assembly is provided with the static arc contact unit toward the moving contact unit, the static arc contact unit is coaxially arranged with the moving contact unit, a step hole is provided at one end of the first shielding cover away from the static side shielding conductor, and the second shielding cover is provided on a connecting boss corresponding to the step hole.

[0016] Furthermore, the outer walls of the moving-side shielding conductor and the stationary-side shielding conductor are both provided with limiting grooves, and a grounding switch or a shielding cap is provided in the limiting groove.

[0017] Compared with the prior art, a moving contact assembly and an isolating switch in an embodiment of the present invention have the following beneficial effects: the moving contact unit can slide axially along the guide hole, an annular limiting groove is axially opened on the inner wall of the guide hole, and the watchband contact finger is arranged in the annular limiting groove. In order to prevent the watchband contact finger from falling out of the annular limiting groove, the watchband contact finger includes an arc-shaped main body and a flexible connecting plate, and the head and tail of the arc-shaped main body are connected with the two ends of the flexible connecting plate to form a ring body. When the moving contact unit slides axially along the guide hole, the moving contact unit passes through the arc-shaped main body and squeezes the flexible connecting plate, so that the two side walls of the flexible connecting plate radially opposite to each other along the annular limiting groove are deformed from a plane to an arc surface, and the head and tail ends of the watchband contact finger are squeezed by force, so that the watchband contact finger is fixedly arranged in the annular limiting groove. The overall structure is simple and the production cost is low, which can prevent the watchband contact finger from moving or falling out in the annular limiting groove, thereby improving the stability during power transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of an isolating switch according to an embodiment of the present invention;

[0019] Figure 2 is a cross-sectional view of the movable contact assembly of the embodiment of the present invention;

[0020] Figure 3 is a schematic structural diagram of a strap contact finger of a moving contact assembly according to an embodiment of the present invention;

[0021] Figure 4 is a schematic diagram of the deformation structure of the flexible connecting plate of the moving contact assembly according to an embodiment of the present invention;

[0022] Figure 5 is a structural schematic diagram of a moving contact unit of a moving contact assembly according to an embodiment of the present invention;

[0023] Figure 6 is a side view of a moving contact unit of a moving contact assembly according to an embodiment of the present invention;

[0024] Figure 7 It is a schematic structural diagram of a moving side shielding conductor of a moving contact assembly according to an embodiment of the present invention;

[0025] Figure 8 yes Figure 1 A partial enlarged view of the .

[0026] In the figure, 1, moving side shielding cover; 2, moving side shielding conductor; 21, limiting hole; 3, moving side supporting conductor; 4, moving side contact assembly; 41, guide hole; 411, annular limiting groove; 5, moving contact unit; 51, contact cylinder; 511, strip hole; 512, countersunk hole; 513, V-shaped groove; 52, moving arc contact; 521, limiting step; 53, rack; 531, limiting part; 54, bridge plate; 6, strap contact finger; 61, arc-shaped body; 62, flexible connecting plate; 7, transmission unit; 8, static side supporting conductor; 9, static side shielding conductor; 10, first shielding cover; 101, step hole; 11, second shielding cover; 111, connecting boss; 12, static side contact assembly; 13, static arc contact unit; 14, limiting groove; 15, grounding switch; 16, shielding cap. DETAILED DESCRIPTION

[0027] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0028] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "inside", "outside", etc. used in the present invention to indicate the orientation or positional relationship are based on the positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred devices and elements must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0029] In the description of the present invention, it should be understood that the present invention uses the terms "first", "second", etc. to describe various information, but these information should not be limited to these terms, and these terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information.

[0030] like Figures 1 to 8 As shown, a moving contact assembly of a preferred embodiment of the present invention comprises a moving side shielding cover 1, a moving side shielding conductor 2, a moving side supporting conductor 3, a moving side contact assembly 4, a moving contact unit 5, a band contact finger 6 and a transmission unit 7, wherein the moving side shielding cover 1, the moving side shielding conductor 2 and the moving side supporting conductor 3 are fixedly connected along the axial direction, the moving side contact assembly 4 is arranged in the moving side shielding conductor 2 and is fixedly connected to the moving side shielding conductor 2, in order to facilitate guiding the movement of the moving contact unit 5, a guide hole 41 is opened in the moving side contact assembly 4 along the axial direction, and the moving contact unit 5 is arranged in the guide hole 41; the transmission unit 7 is arranged outside the moving side shielding conductor 2, and the output end extends into the guide hole 41 and is transmission-connected to the moving contact unit 5, so as to drive the moving contact unit 5 to slide axially along the guide hole 41.

[0031] In order to facilitate the installation of the strap contact finger 6 and simplify the installation structure of the strap contact finger 6, refer to Figure 2 , Figure 3 , Figure 4 The inner wall of the guide hole 41 is provided with an annular limiting groove 411 along the axial direction, and the watchband contact finger 6 is arranged in the annular limiting groove 411. In order to prevent the watchband contact finger 6 from falling out of the annular limiting groove 411, the watchband contact finger 6 includes an arc-shaped body 61 and a flexible connecting plate 62, wherein the head and tail of the arc-shaped body 61 are connected to the two ends of the flexible connecting plate 62 to form a complete ring body, and the flexible connecting plate 62 has a certain ductility, can be bent, and has a certain structural lightness, and can generally be made of metal materials. In some embodiments, the flexible connecting plate 62 is a thin plate structure made of pure copper. First, the watchband contact finger 6 is installed as a whole in the annular limiting groove 411. When the moving contact unit 5 first slides axially along the guide hole 41 and passes through the watchband contact finger 6, the moving contact passes through the arc-shaped body 61 and squeezes the flexible connecting plate 62, so that the flexible connecting plate 62 is deformed from a plane to an arc surface along the radially opposite two side walls of the annular limiting groove. At this time, the flexible connecting plate 62 is stretched to a long side length and has an arc shape and is clamped in the annular limiting groove 411. The flexible connecting plate 62 squeezes the head and tail ends of the arc-shaped body 61, so that the watchband contact finger 6 is fixed in the annular limiting groove 411. In some embodiments, the watchband contact finger 6 can also be replaced by a spring contact finger, which can be selected according to actual design requirements.

[0032] In some embodiments, see Figure 3 , Figure 4 In order to ensure that the flexible connecting plate 62 has a certain structural strength after deformation and can always provide stable pressure to squeeze the two ends of the arc-shaped body 61, the value range of the center angle α of the flexible connecting plate 62 on the circle where the arc-shaped body 61 is located is 25°-30°. When the value of the center angle α is less than 25°, the length of the flexible connecting plate 62 is short, it is not easy to deform, and the moving contact unit 5 is easy to get stuck when passing through the arc-shaped body 61. When the value of the center angle α is greater than 30°, the length of the flexible connecting plate 62 is long, and the corresponding arc after deformation is large. When the moving contact unit 5 passes through, due to the large contact area with the moving contact unit 5, it is easy to come out under the drive of the moving contact unit 5. Further, in order to ensure that the flexible connecting plate 62 has good deformation ability and structural strength after deformation, the thickness of the flexible connecting plate 62 is 1.5mm-2.5mm. In this embodiment, the thickness of the flexible connecting plate 62 is 2mm.

[0033] In some embodiments, in order to facilitate the connection between the transmission unit 7 and the moving contact unit 5, and at the same time, improve the heat dissipation capacity inside the moving contact assembly to avoid overheating of the moving contact assembly and affect the power transmission efficiency, therefore, refer to Figure 7A plurality of limiting holes 21 are provided in the circumferential direction of the side wall of the moving side shield conductor 2, wherein the axial direction of the plurality of limiting holes 21 is the same as the radial direction of the moving side shield conductor 2, and the output end of the transmission unit 7 passes through a limiting hole 21 and extends to the guide hole 41 to be connected to the moving contact unit 5. At the same time, the plurality of limiting holes 21 further reduce the overall weight of the moving contact assembly, which is convenient for installation and transportation.

[0034] In some embodiments, in order to facilitate the transmission unit 7 to drive the moving contact unit 5, at the same time, simplify the overall structure of the moving contact unit 5, and ensure the stability of the axial movement of the moving contact unit 5 driven by the transmission unit 7 along the guide hole 41, refer to Figure 5 The moving contact unit 5 includes a contact cylinder 51, a moving arc contact 52, a rack 53, and a bridge plate 54, wherein both ends of the contact cylinder 51 are open, and one end is connected to the moving arc contact 52, and the other end is provided with a bridge plate 54, specifically, the bridge plate 54 is connected to the contact cylinder 51 by screws, the contact cylinder 51 is provided with a rack 53 along the axial direction, the rack 53 is fixedly connected to the bridge plate 54, the side wall of the contact cylinder 51 is provided with a strip hole 511 along the axial direction, and the output shaft of the transmission unit 7 is provided with a driving gear, and the toothed portion of the driving gear passes through the strip hole 511 and meshes with the rack 53 for transmission. Gear transmission is adopted to ensure the stability of the moving contact unit 5 when it moves.

[0035] Further, in order to facilitate the positioning of the rack 53 in the length direction, refer to Figure 5 The rack 53 is arranged between the moving arc contact 52 and the bridge plate 54. Specifically, a countersunk hole 512 is opened at one end of the contact cylinder 51 facing the moving arc contact 52, and the moving arc contact 52 is provided with a limiting step 521 corresponding to the countersunk hole 512. One end face of the rack 53 is arranged in contact with the limiting step 521, and the other end face is arranged in contact with the bridge plate 54 and is fixedly connected to the bridge plate 54 by screws.

[0036] Furthermore, in order to prevent the installation position of the rack 53 from moving, in this embodiment, refer to Figure 6 A V-shaped groove 513 is formed on the inner wall of the contact cylinder 51 along the axial direction, and the rack 53 is provided with a limiting portion 531 corresponding to the V-shaped groove 513 , so as to realize reliable limiting of the position of the rack 53 .

[0037] Furthermore, in order to improve the stability of the moving contact assembly structure, the number of annular limit grooves 411 is multiple, and the number of strap contact fingers 6 and the annular limit grooves 411 are the same and the positions are corresponding. When one strap contact finger 6 is damaged or detached, the other strap contact fingers 6 can still achieve current flow, ensuring the stability of the power transmission process.

[0038] The present invention also provides a disconnector, comprising any one of the above moving contact assemblies, and further comprising a stationary side support conductor 8, a stationary side shielding conductor 9, a first shielding cover 10, a second shielding cover 11, a stationary side contact assembly 12, and a stationary arc contact unit 13. The stationary side support conductor 8, the stationary side shielding conductor 9, and the first shielding cover 10 are arranged in sequence from far to near toward the moving contact unit 5. The stationary side contact assembly 12 is fixedly provided in the first shielding cover 10, and the stationary side contact assembly 12 is provided with a stationary arc contact unit 13 toward the moving contact unit 5. The stationary arc contact unit 13 is coaxially arranged with the moving contact unit 5. In order to improve the ablation resistance of the disconnector, in this embodiment, a step hole 101 is provided at one end of the first shielding cover 10 away from the stationary side shielding conductor 9, and the second shielding cover 11 is provided at a connecting boss 111 corresponding to the step hole 101. By increasing the contact area between the first shielding cover 10 and the second shielding cover 11, the first shielding cover 10 and the second shielding cover 11 are fixedly connected by screws, thereby improving the ablation resistance of the stationary side shielding of the disconnector.

[0039] Furthermore, in order to meet the use requirements of the isolating switch under different conditions and ensure the safety of the power equipment, a limiting groove 14 is provided on the outer wall of the moving side shielded conductor 2 and the static side shielded conductor 9, and a grounding switch or a shielding cap is provided in the limiting groove 14, wherein the grounding switch includes two types of switches, one type of grounding switch is a mechanical switch device used to connect or switch the grounding line, and selectively discharge the current to ensure the safety of equipment and personnel. The other type of grounding switch is a mechanical switch device used to quickly cut off the faulty power supply in a very short time to ensure the safety of equipment and personnel when a grounding fault occurs. It can be selected according to actual needs.

[0040] In summary, the embodiment of the present invention provides a moving contact assembly and an isolating switch, the moving contact unit 5 can slide axially along the guide hole 41, an annular limiting groove 411 is axially opened on the inner wall of the guide hole 41, and the watchband contact finger 6 is arranged in the annular limiting groove 411. In order to prevent the watchband contact finger 6 from falling out of the annular limiting groove, the watchband contact finger 6 includes an arc-shaped main body 61 and a flexible connecting plate 62, and the head and tail of the arc-shaped main body 61 are connected with the two ends of the flexible connecting plate 62 to form a ring body. When the moving contact unit 5 slides axially along the guide hole 41, the moving contact unit 5 passes through the arc-shaped main body 61 and squeezes the flexible connecting plate 62, so that the two radially opposite side walls of the flexible connecting plate 62 along the annular limiting groove are deformed from a plane to an arc surface, and the head and tail ends of the watchband contact finger 6 are squeezed, so that the watchband contact finger 6 is fixedly arranged in the annular limiting groove 411. The overall structure is simple and the production cost is low, which can prevent the watchband contact finger 6 from moving or falling out in the annular limiting groove 411, thereby improving the stability during power transmission.

[0041] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A moving contact assembly, characterized in that: It includes a moving side shielding cover, a moving side shielding conductor, a moving side supporting conductor, a moving side contact assembly, a moving contact unit, a band contact finger and a transmission unit; The movable side shielding cover, movable side shielding conductor and movable side supporting conductor are fixedly connected along the axial direction; the movable side contact assembly is arranged in the movable side shielding conductor and is fixedly connected to the movable side shielding conductor; the movable side contact assembly is provided with a guide hole along the axial direction; the movable contact unit is arranged in the guide hole; the transmission unit is arranged outside the movable side shielding conductor, and the output end extends into the guide hole and is transmission-connected with the movable contact unit, so as to drive the movable contact unit to slide axially along the guide hole; The inner wall of the guide hole is provided with an annular limiting groove along the axial direction, the watchband contact finger is arranged in the annular limiting groove, the watchband contact finger comprises an arc-shaped body and a flexible connecting plate, and the head and tail of the arc-shaped body are connected to the two ends of the flexible connecting plate; Among them, the moving contact unit slides axially along the guide hole, passes through the arc-shaped main body and squeezes the flexible connecting plate, so that the two radially opposite side walls of the flexible connecting plate along the annular limiting groove are deformed from a plane to an arc surface, so that the watchband contact finger is fixed in the annular limiting groove.

2. The moving contact assembly according to claim 1, characterized in that: The central angle range of the flexible connecting plate on the circle where the arc-shaped main body is located is 25°-30°.

3. The moving contact assembly according to claim 1, characterized in that: The thickness of the flexible connecting plate is 1.5 mm-2.5 mm.

4. The moving contact assembly according to claim 1, characterized in that: A plurality of limiting holes are circumferentially provided on the side wall of the moving side shielding conductor, and the axial direction of the plurality of limiting holes is the same as the radial direction of the moving side shielding conductor. The output end of the transmission unit passes through one of the limiting holes and extends to the guide hole to be connected with the moving contact unit.

5. The moving contact assembly according to claim 1, characterized in that: The moving contact unit includes a contact cylinder, a moving arc contact, a rack, and a bridge plate. Both ends of the contact cylinder are open, and one end is connected to the moving arc contact, and the other end is provided with the bridge plate. The contact cylinder is axially provided with a rack, and the rack is fixedly connected to the bridge plate. The side wall of the contact cylinder is axially provided with a strip hole, and the output shaft of the transmission unit is provided with a driving gear, and the toothed portion of the driving gear passes through the strip hole and meshes with the rack for transmission.

6. The moving contact assembly according to claim 5, characterized in that: A countersunk hole is formed at one end of the contact cylinder toward the moving arc contact, and the moving arc contact is provided with a limiting step corresponding to the countersunk hole. One end surface of the rack is arranged in contact with the limiting step, and the other end surface is arranged in contact with the bridge plate.

7. The moving contact assembly according to claim 5, characterized in that: The inner wall of the contact cylinder is provided with a V-shaped groove along the axial direction, and the rack is provided with a limiting portion corresponding to the V-shaped groove.

8. The moving contact assembly according to claim 1, characterized in that: The number of the annular limiting grooves is multiple, and the number of the strap contact fingers is the same as that of the annular limiting grooves and their positions correspond.

9. An isolating switch, comprising the moving contact assembly according to any one of claims 1 to 8, characterized in that: It also includes a static side supporting conductor, a static side shielding conductor, a first shielding cover, a second shielding cover, a static side contact assembly, and a static arc contact unit. The static side supporting conductor, the static side shielding conductor, and the first shielding cover are arranged in sequence from far to near toward the moving contact unit. The static side contact assembly is fixedly provided in the first shielding cover. The static side contact assembly is provided with the static arc contact unit toward the moving contact unit. The static arc contact unit is coaxially arranged with the moving contact unit. The first shielding cover is provided with a step hole at one end away from the static side shielding conductor, and the second shielding cover is provided on a connecting boss corresponding to the step hole.

10. The isolating switch according to claim 9, characterized in that: The outer walls of the moving-side shielding conductor and the static-side shielding conductor are both provided with limiting grooves, and a grounding switch or a shielding cap is provided in the limiting groove.

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