A small fuse type isolating switch

Abstract

The present invention provides a small fuse-type disconnector, comprising: a plurality of contacts, arranged on a base, one end of the contact is provided with an elastic contact portion that can be clamped with a fuse core, the other end is connected to a wiring terminal, a first partition is provided between two adjacent wiring terminals; a second partition is provided between two adjacent contacts, the left end face of the second partition is arranged beyond the elastic contact portion, and the right end face thereof extends into an inner cavity formed by two adjacent first partitions. By lengthening the end faces on both sides of the second partition, the creepage distance and electrical clearance between two adjacent contacts are increased, thereby improving the rated stamping withstand voltage and rated insulation voltage of the product, and meeting the needs of customers for use in certain special occasions.

Description

Technical Field

[0001] The invention relates to the technical field of electrical switches, and in particular to a small fuse type isolating switch. Background Art

[0002] Isolating switches are usually used in conjunction with fuses. They have the two functions of "load disconnection" and "isolation". Fuses can be added to each pole for "overload and short-circuit protection", making full use of the protection characteristic curve of the fuse to protect cables and equipment in the line, and providing obvious disconnection points during maintenance to ensure the personal safety of workers.

[0003] Existing small fuse-type isolating switches such as Fig.11 and 12 As shown, it includes a base 01, a plurality of contacts 02 arranged on the base, and a terminal block 03 connected to the contact 02, a first partition 04 is arranged between two adjacent terminals 03, and a second partition 05 is arranged between two adjacent contacts 02, wherein a left end face 051 of the second partition 05 is flush with one side end face of the contact 02, and a right end face 052 is arranged flush with the first partition 04. The above switch has the defect of low electrical parameters (such as low rated stamping withstand voltage and low rated insulation voltage), and cannot meet the needs of customers for use in certain special occasions. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the small fuse-type isolating switch in the prior art, that is, the small fuse-type isolating switch has low electrical parameters and cannot meet the needs of customers in certain special occasions, thereby providing a small fuse-type isolating switch with high electrical parameters.

[0005] To this end, the present invention provides a small fuse-type isolating switch, including a contact and a second partition, wherein a plurality of contacts are arranged on a base, one end of the contact is provided with an elastic contact portion that can be clamped with a fuse core, and the other end is connected to a wiring terminal, and a first partition is provided between two adjacent wiring terminals; a second partition is provided between two adjacent contacts, the left end face of the second partition is arranged beyond the elastic contact portion, and the right end face thereof extends into an inner cavity formed by the two adjacent first partitions.

[0006] Two rows of contacts are arranged on the left and right sides of the base, a plurality of first screws are arranged between the two rows of contacts, and a screw insulating sleeve arranged around the first screws is arranged on the base.

[0007] There are two screw insulating sleeves, which are connected by a connecting plate. The connecting plate is connected to the base by an elastic hook structure. The elastic hook structure includes a hanging hole provided on the base and an elastic hook provided on the connecting plate and can be hooked with the hanging hole.

[0008] It also includes a cover plate rotatably connected to the base, a connecting shaft is provided on the outer wall of the base, a rotating arm that can be connected to the connecting shaft is provided on the cover plate, and a slot that is adaptably connected to the connecting shaft is provided on the rotating arm.

[0009] The cover has a closed state and an open state tilted at a certain angle to the base. The rotating arm is U-shaped, and a block is provided on the outer wall of the base that can cooperate with the U-shaped rotating arm to block the cover so that the cover remains in a set open state.

[0010] The cover plate is buckled and connected to the base through a buckle structure, and the buckle structure includes a matching hole provided on the base, and a buckle provided on the cover plate that can be buckled and connected to the matching hole.

[0011] The cover plate is provided with a plurality of mounting members suitable for mounting the fusible cores, and a third partition plate is provided between two adjacent fusible cores.

[0012] A panel is arranged on the top of the cover plate, and heat dissipation holes are arranged on the side surfaces of the cover plate and the panel.

[0013] A rear guard plate is provided above the connecting terminal on one side of the connecting shaft on the base, and the rear guard plate is fixedly connected to the base via a snap-fit ​​structure. The snap-fit ​​structure includes an oblique buckle hanging platform provided on the base, and an oblique buckle provided on the rear guard plate that can be snap-fitted with the oblique buckle hanging platform.

[0014] The rear guard plate is also connected to the base in a positioning manner through a positioning structure, wherein the positioning structure includes two positioning grooves arranged on both sides of the base, and a positioning block arranged on the rear guard plate that can be adapted to connect with the positioning grooves.

[0015] The contact is fixedly connected to the base via a second screw, and a blind hole for the second screw to extend into is formed on the base.

[0016] The technical solution of the present invention has the following advantages:

[0017] 1. The small fuse-type disconnector provided by the present invention has a second partition plate between two adjacent contacts, the left end surface of the second partition plate is arranged beyond the elastic contact portion, and the right end surface thereof extends into the inner cavity formed by the two adjacent first partition plates. By lengthening the end surfaces on both sides of the second partition plate, the creepage distance and electrical clearance between the two adjacent contacts are increased, thereby improving the rated stamping withstand voltage and rated insulation voltage of the product.

[0018] 2. The small fuse-type disconnector provided by the present invention has a plurality of first screws between two rows of contacts, and a screw insulating sleeve arranged around the first screws is provided on the base. The screw insulating sleeve can increase the creepage distance and electrical clearance between the first screws and the contacts, and has higher safety performance.

[0019] 3. The small fuse-type disconnector provided by the present invention has two screw insulating sleeves, which are connected by a connecting plate, and the connecting plate is connected to the base by an elastic hook structure. The elastic hook structure includes a hanging hole provided on the base, and an elastic hook provided on the connecting plate and can be hooked and connected to the hanging hole. The elastic hook and hanging hole that cooperate with each other have the advantages of simple structure and quick and convenient disassembly and assembly.

[0020] 4. The small fuse-type isolating switch provided by the present invention has a connecting shaft on the outer wall of the base, a rotating arm connectable to the connecting shaft on the cover plate, and a slot adaptably connected to the connecting shaft on the rotating arm. Compared with the prior art in which the cover plate rotating arm is built into the base, which requires a avoidance hole to be provided on the bottom plate of the base for the movement of the rotating arm, the scheme of the present application adopts a method of externally placing the rotating arm on the base. Compared with the prior art in which the rotating arm is built into the base, which requires a hole to be opened on the bottom surface of the base for the rotation of the rotating arm, the creepage distance of the switch is improved. At the same time, after the rotating arm is externalized, the internal parts of the switch can have a larger space to be arranged separately, which is more conducive to increasing the phase-to-phase creepage distance and electrical clearance of the switch.

[0021] 5. The small fuse-type disconnector provided by the present invention has a cover in a closed state and an open state tilted at a certain angle to the base. The rotating arm is U-shaped, and a block is provided on the outer wall of the base that can cooperate with the U-shaped rotating arm to block the cover so that the cover remains in the set open state. In this way, the cover is not easily separated from the base, and the fuse core is conveniently replaced. At the same time, the safety of the user and the switch can be ensured, and the cover is prevented from falling directly after the switch is opened.

[0022] 6. The small fuse-type isolating switch provided by the present invention has a cover plate that is snap-fitted with the base through a snap-fit ​​structure. The snap-fit ​​structure includes a matching hole provided on the base and a snap-fit ​​platform provided on the cover plate that can be snap-fitted with the matching hole. The snap-fit ​​platform and the matching hole that match each other have the advantage of a simple structure. When the switch is not equipped with a fuse core, the cover plate and the base are not easy to separate and fall off in different placement states, and the reliability is higher.

[0023] 7. The small fuse-type disconnector provided by the present invention has a cover plate provided with a plurality of mounting parts suitable for installing the fuse core, and a third partition plate is provided between two adjacent fuse cores. When the cover plate and the base are in a snap-fit ​​state, the third partition plate can be inserted between two adjacent contacts, thereby further increasing the creepage distance and electrical clearance between the two adjacent contacts and improving the safety performance.

[0024] 8. The small fuse-type disconnector provided by the present invention has a rear guard plate above the wiring terminal on one side of the connecting shaft on the base, and the rear guard plate is fixedly connected to the base through a buckle structure, and the buckle structure includes an oblique buckle hanging platform provided on the base, and an oblique buckle provided on the rear guard plate that can be buckled and connected with the oblique buckle hanging platform. The rear guard plate can shield and protect the wiring terminal, ensuring that the protection level of the switch housing is IP30, and the buckle connection method is adopted, which is quick and convenient to disassemble and assemble.

[0025] 9. The small fuse-type isolating switch provided by the present invention has a contact fixedly connected to the base by a second screw, and a blind hole is formed on the base for the second screw to extend into. Compared with the prior art in which the second screw is arranged to pass through the bottom plate of the base and the hole needs to be sealed by a glue filling process to prevent leakage, this simplifies the process and has higher safety performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A three-dimensional diagram of a small fuse-type disconnect switch of the present invention in an open state;

[0028] Figure 2 for Figure 1 The main view of

[0029] Figure 3 A three-dimensional diagram of the base;

[0030] Figure 4 It is an exploded schematic diagram of the rear cover, screw insulating sleeve and base;

[0031] Figure 5 for Figure 3 A top view of

[0032] Figure 6 for Figure 5 Cross-section view in the AA direction;

[0033] Figure 7 for Figure 5 Cross-section along the middle BB direction;

[0034] Figure 8 for Figure 5 Cross-sectional view in the mid-CC direction;

[0035] Fig. 9It is a three-dimensional diagram of a small fuse-type disconnect switch in a closed state;

[0036] Fig.10 for Fig. 9 sectional view of

[0037] Fig.11 A three-dimensional diagram of a small-sized fuse-type disconnector in the prior art;

[0038] Fig.12 for Fig.11 Top view of the center base.

[0039] Description of reference numerals: 01, base; 02, contact; 03, terminal; 04, first partition; 05, second partition; 051, left end surface; 052, right end surface;

[0040] 1. Base; 11. First partition; 12. Second partition; 121. Left end face; 122. Right end face; 13. Hanging hole; 14. Connecting shaft; 15. Stopper; 16. Matching hole; 17. Oblique buckle hanging platform; 18. Positioning groove; 19. Blind hole; 2. Contact; 21. Elastic contact part; 22. Second screw; 3. Fuse core; 4. Terminal block; 5. First screw; 6. Screw insulating sleeve; 61. Connecting plate; 62. Elastic hook; 7. Cover plate; 71. Rotating arm; 72. Slot; 73. Buckle platform; 74. Mounting piece; 75. Third partition; 76. Panel; 77. Heat dissipation hole; 8. Rear guard plate; 81. Oblique buckle; 82. Positioning block. DETAILED DESCRIPTION

[0041] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or 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 device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0045] Example

[0046] This embodiment provides a small fuse-type isolating switch, such as Figure 1 and 9 As shown, it includes a base 1, a cover plate 7 and a rear guard plate 8.

[0047] Two rows of contacts 2 are arranged on the left and right sides of the base 1. Figure 3-5 As shown, a plurality of first screws 5 are provided between the two rows of contacts 2, and a screw insulating sleeve 6 is provided on the base 1 around the first screw 5. There are two screw insulating sleeves 6, and the two screw insulating sleeves 6 are connected by a connecting plate 61. The connecting plate 61 is connected to the base 1 by an elastic hook structure. Figure 6 As shown, the elastic hook structure includes a hanging hole 13 provided on the base 1, and an elastic hook 62 provided on the connecting plate 61 and hooked with the hanging hole 13. The contact 2 is fixedly connected to the base 1 by a second screw 22. Figure 7 As shown, a blind hole 19 is formed on the base 1 for the second screw 22 to extend into.

[0048] Each row is provided with three contacts 2, such as Figure 5 As shown, one end of the contact 2 is provided with an elastic contact part 21 that can be clamped with the fuse 3, and the other end is connected to the terminal 4. A first partition 11 is provided between two adjacent terminals 4, and a second partition 12 is provided between two adjacent contacts 2. The left end face 121 of the second partition 12 is set beyond the elastic contact part 21, and the right end face 122 thereof extends into the inner cavity formed by the two adjacent first partitions 11.

[0049] The cover plate 7 is rotatably mounted on the base 1. Figure 2As shown, a connecting shaft 14 is provided on the outer wall of the base 1, and a rotating arm 71 that can be connected to the connecting shaft 14 is provided on the cover plate 7, and a slot 72 that is adapted to connect to the connecting shaft 14 is provided on the rotating arm 71. The cover plate 7 has a closed state and an open state that is tilted at a certain angle to the base 1. The rotating arm 71 is U-shaped, and a stopper 15 that can cooperate with the U-shaped rotating arm 71 to block the cover plate 7 so that the cover plate 7 remains in the set open state. Fig.10 As shown, the cover plate 7 is buckled and connected with the base 1 through a buckle structure, and the buckle structure includes a matching hole 16 provided on the base 1, and a buckle 73 provided on the cover plate 7 that can be buckled and connected with the matching hole 16. Figure 1 As shown, a plurality of mounting members 74 suitable for mounting the fusible cores 3 are provided on the bottom surface of the cover plate 7, and a third partition plate 75 is provided between two adjacent fusible cores 3. Fig. 9 As shown, a panel 76 is provided on the top of the cover plate 7 , and heat dissipation holes 77 are provided on the side surfaces of the cover plate 7 and the panel 76 .

[0050] The rear guard plate 8 is arranged above the terminal block 4. Figure 8 and 9 As shown, the rear guard plate 8 is fixedly connected to the base 1 through a buckle structure, and the buckle structure includes an oblique buckle hanging platform 17 provided on the base 1, and an oblique buckle 81 provided on the rear guard plate 8 and can be buckled and connected with the oblique buckle hanging platform 17. The rear guard plate 8 is also positioned and connected to the base 1 through a positioning structure, and the positioning structure includes two positioning grooves 18 provided on both sides of the base 1, and a positioning block 82 provided on the rear guard plate 8 and can be adapted and connected with the positioning grooves 18.

[0051] The small fuse-type disconnector provided by the present invention has a second partition 12 between two adjacent contacts 2, a left end face 121 of the second partition 12 is arranged beyond the elastic contact part 21, and a right end face 122 thereof extends into an inner cavity formed by two adjacent first partitions 11. By lengthening the end faces on both sides of the second partition 12, the creepage distance and electrical clearance between the two adjacent contacts 2 are increased, thereby increasing the rated stamping withstand voltage and the rated insulation voltage of the product.

[0052] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A small fuse-type isolating switch, characterized in that: include: A plurality of contacts (2) are arranged on a base (1), one end of each contact (2) being provided with an elastic contact portion (21) capable of being clamped with a fuse core (3), and the other end of each contact (2) being connected to a wiring terminal (4), and a first partition plate (11) being provided between two adjacent wiring terminals (4); A second partition (12) is arranged between two adjacent contacts (2), wherein an end surface (121) of the second partition (12) close to the elastic contact portion (21) is arranged beyond the elastic contact portion (21), and an end surface (122) of the second partition (12) close to the wiring terminal (4) extends into an inner cavity formed by the two adjacent first partitions (11); a cover plate (7) rotatably connected to the base (1), a connecting shaft (14) being provided on the outer wall of the base (1), a rotating arm (71) being connected to the connecting shaft (14) being provided on the cover plate (7), and a slot (72) being adaptably connected to the connecting shaft (14) being provided on the rotating arm (71); A rear guard plate (8) is provided on the base (1) above the connecting terminal (4) on one side of the connecting shaft (14); the rear guard plate (8) is fixedly connected to the base (1) via a snap-fit ​​structure; the snap-fit ​​structure comprises an oblique buckle hanging platform (17) provided on the base (1), and an oblique buckle (81) provided on the rear guard plate (8) and capable of being snap-fitted with the oblique buckle hanging platform (17).

2. The small fuse-type disconnector according to claim 1, characterized in that: A row of contacts (2) is provided on each of the left and right sides of the base (1), a plurality of first screws (5) are provided between the two rows of contacts (2), and a screw insulating sleeve (6) arranged around the first screws (5) is provided on the base (1).

3. The small fuse-type disconnector according to claim 2, characterized in that: There are two screw insulating sleeves (6), the two screw insulating sleeves (6) are connected via a connecting plate (61), the connecting plate (61) is connected to the base (1) via an elastic hook structure, the elastic hook structure comprises a hanging hole (13) provided on the base (1), and an elastic hook (62) provided on the connecting plate (61) and capable of being hooked and connected to the hanging hole (13).

4. The small fuse-type disconnector according to claim 1, characterized in that: The cover plate (7) has a closed state and an open state in which it is tilted at a certain angle to the base (1); the rotating arm (71) is U-shaped; and a stopper (15) is provided on the outer wall of the base (1) and can cooperate with the U-shaped rotating arm (71) to block the cover plate (7) so that the cover plate (7) remains in the set open state.

5. The small fuse-type disconnector according to claim 4, characterized in that: The cover plate (7) is snap-fitted and connected to the base (1) via a snap-fit ​​structure, wherein the snap-fit ​​structure comprises a matching hole (16) provided on the base (1), and a snap-fitting platform (73) provided on the cover plate (7) and capable of being snap-fitted and connected to the matching hole (16).

6. The small fuse-type disconnector according to claim 5, characterized in that: The cover plate (7) is provided with a plurality of mounting members (74) suitable for mounting the fusible cores (3), and a third partition plate (75) is provided between two adjacent fusible cores (3).

7. The small fuse-type disconnector according to claim 6, characterized in that: A panel (76) is provided on the top of the cover plate (7), and heat dissipation holes (77) are provided on the side surfaces of the cover plate (7) and the panel (76).

8. The small fuse-type disconnector according to claim 1, characterized in that: The rear guard plate (8) is also connected to the base (1) in a positioning manner via a positioning structure, wherein the positioning structure comprises two positioning grooves (18) provided on both sides of the base (1), and a positioning block (82) provided on the rear guard plate (8) and capable of being adapted to connect with the positioning grooves (18).

9. The small fuse-type disconnector according to claim 1, characterized in that: The contact (2) is fixedly connected to the base (1) via a second screw (22); a blind hole (19) is formed on the base (1) for the second screw (22) to extend into.

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