Outdoor low voltage enclosed load isolating switch with power assist mechanism

Abstract

The invention discloses an outdoor low-voltage enclosed load isolating switch with an assist mechanism, which consists of a box body, a cover body, a fuse, two wiring terminals, two static contacts and two sets of elastic assist mechanisms. The beneficial technical effect of the invention is as follows: an outdoor low-voltage enclosed load isolating switch with an assist mechanism is proposed, which can encapsulate all components of the isolating switch in a shell, thereby protecting metal parts on the isolating switch and effectively preventing foreign objects from overlapping the isolating switch.

Description

Technical Field

[0001] The invention relates to a fuse type isolating switch, in particular to an outdoor low-voltage enclosed load isolating switch with a power assist mechanism. Background Art

[0002] Low-voltage fuse disconnectors are commonly used devices in low-voltage power distribution lines. Existing low-voltage fuse disconnectors have the following main problems: 1) The fuse is the core component of the low-voltage fuse disconnector. Existing fuses are made of thin copper sheets with narrow cross-sections. Most of them are exposed to the natural environment during operation. Due to corrosion from natural environments such as acid rain, their time-current characteristics are easily changed. It is often the case that "it does not melt when it should melt, and it melts when it should not melt", which cannot effectively protect the lines and equipment; 2) The contact blades of existing low-voltage fuse disconnectors cannot achieve the self-locking function. During normal operation, the contact blades are easily accidentally separated from the clamping position, causing unnecessary power outages; 3) Existing low-voltage fuse disconnectors do not have the load separation function, which poses a safety hazard when repairing lines. Especially for large-capacity lines, the arc generated when the low-voltage fuse disconnector is disconnected under load will seriously burn the contact blade or contact surface, causing damage to the contact blade or contact. Summary of the invention

[0003] In view of the problems in the background technology, the present invention proposes an outdoor low-voltage enclosed load isolating switch with an assist mechanism, and its structure is as follows: the outdoor low-voltage enclosed load isolating switch is composed of a box body, a cover body, a fuse, two wiring terminals, two static contacts and two sets of elastic assist mechanisms;

[0004] The fuse is a knife-shaped fuse; the outer wall of the middle part of the fuse is connected to the inner side of the cover body, the axial direction of the contact knife on the fuse is parallel to the axial direction of the cover body; two hanging shafts are arranged on the outer wall of the lower end of the cover body;

[0005] The static contact is arranged on the bottom surface of the inner cavity of the box body, and the positions of the two static contacts correspond to the two contact blades on the fuse one by one; the wiring terminal is arranged on the bottom surface of the inner cavity of the box body, and the two wiring terminals are isolated from each other; the wiring terminal includes a contact connection end and a wire connection end, the contact connection end is electrically connected to the static contact, and the two wiring terminals correspond to the two static contacts one by one; the wire connection end is used to connect an external wire, and a hole matching the wire connection end is arranged on the box body, and the wire connection end is connected to the outside of the box body through the hole;

[0006] When the cover body closes the opening of the inner cavity of the box body, the two contact knives on the fuse are respectively inserted into the elastic slots of the two static contacts, and the elastic slots hold the contact knives tightly;

[0007] Two hooks are arranged on the outer wall of the box body at positions corresponding to the hanging shafts, and the two hooks correspond to the two hanging shafts one by one; when the box body is erected, the hooks are located at the lower end of the box body and the opening of the hooks faces upward; when the hanging shaft is placed in the hooks, the cover body can swing in the hook along the circumferential direction of the hanging shaft; when the upper end of the cover body swings to the maximum upward stroke position, the cover body closes the opening of the inner cavity of the box body; the axial direction of the touch knife is parallel to the swinging plane of the cover body;

[0008] A mechanism bin is provided on each of the side walls on both axial sides of the box body, and two sets of elastic assist mechanisms are respectively provided in the two mechanism bins, and the direction of the opening of the mechanism bin is the same as the direction of the opening of the inner cavity of the box body; the supporting part of the elastic assist mechanism is connected to the inner wall of the mechanism bin, and the contact part of the elastic assist mechanism protrudes outside the mechanism bin; a limiting groove is provided on the contact part; two supporting shafts are provided on the inner side surface of the cover body, and the two supporting shafts correspond to the two limiting grooves one by one; when the upper end of the cover body is swung upward to a certain position, the supporting shaft can enter the limiting groove through the opening of the limiting groove; after the supporting shaft enters the limiting groove, the upper end of the cover body can only swing downward to make the supporting shaft escape from the limiting groove; when the cover body is closed, the elastic assist mechanism can enable the cover body to quickly close the opening of the inner cavity of the box body; when the cover body is opened, the elastic assist mechanism can enable the cover body to quickly separate from the box body;

[0009] The box body and the cover body are made of insulating materials.

[0010] The scheme of the present invention has the following advantages:

[0011] 1) The shell composed of the box body and the cover body encloses all the components, which can effectively protect the components in the switch and prevent corrosion of the components. It can also prevent foreign objects from overlapping the metal parts and causing short circuits;

[0012] 2) The knife-shaped fuse replaces the existing fuse-type fuse, avoiding exposure to the natural environment and effectively ensuring that its time-current characteristics remain constant. The performance of the knife-shaped fuse is more accurate and can stably play a protective role for the lines and equipment. 3) After the fuse-type disconnector is closed, the static contact holds the knife of the knife-shaped fuse tightly through the elastic slot, which improves the reliability of the electrical contact between the knife and the contact;

[0013] 4) Since the main application scenario of this technology is outdoor overhead lines, in order to facilitate the operation of opening and closing between the contact blade and the contact at a high place, hooks and hanging shafts are set on the box body and the cover body respectively. The cover body realizes the opening and closing operation by swinging up and down; when installing the cover body, the cover body can be lifted and hung on the hook with a tool. In subsequent operations, you only need to push the cover body to swing without worrying about the cover body falling. When opening the switch, the cover body is opened because it is blocked by the hook, so there is no need to worry about the cover body falling. The operation is very convenient, especially for operation at a high place;

[0014] 5) An elastic assist mechanism is provided in the structure. When the cover is opened or closed, the elastic assist mechanism can speed up the movement of the cover. When operating under load, it can effectively reduce the negative impact of the arc. At the same time, it can effectively lock the fuse to avoid accidental opening due to electric force or gravity.

[0015] In specific implementation, the terminal block can adopt a variety of structural schemes: for example, the contact connection end of the terminal block is a plate-like structure, the wire connection end of the terminal block is a tubular structure, the contact connection end is fixed to the bottom surface of the inner cavity of the box body by bolts, and the external wire is plugged into the inner hole of the wire connection end (when the external wire is plugged into the wire connection end, the existing technology can also be used to provide a clamping bolt on the side wall of the wire connection end); a connector can also be prefabricated at the end of the external wire, and the wire connection end is set to a physical form that matches the connector, and the connection between the connector and the wire connection end is achieved by bolts.

[0016] The fuse may be a knife-shaped fuse, or an ordinary fuse (fuse) type fuse, or even a knife-shaped direct-connection block, etc., which is not limited here.

[0017] From the functional point of view, the elastic booster mechanism is a common technology. Figure 7 , 8 It shows a specific structural form, which has some differences in structure from other devices with similar functions. In specific implementation, it can adopt the attached Figure 7 , 8 The elastic assist mechanism shown can also be selectively adopted in existing structures with similar functions.

[0018] Preferably, an arc extinguishing hood is provided on the static contact on the upper side. Since the cover body is opened and closed in a swinging manner, when closed, the static contact on the upper side contacts the contact blade on the fuse later, and when separated, the static contact on the upper side separates from the contact blade on the fuse first, and the arc is mainly generated on the static contact on the upper side, so an arc extinguishing hood is provided on it; the arc extinguishing hood can effectively prevent the generation of arcs and protect the static contact and the contact.

[0019] Preferably, a pull ring is provided on the surface of the cover body. After the pull ring is provided, the cover body can be operated at a high place / long distance with a hook-shaped tool.

[0020] Preferably, an operation hole is provided on the lateral side wall at the lower end of the cover body. After the operation hole is provided, we can lift the cover body by tools to achieve high-place operation; in addition, when the operation hole is combined with the aforementioned hook solution, there are the following benefits: based on common sense, since the operation hole is provided at the lower end of the cover body, the center of gravity of the cover body is located above the operation hole. When the cover body naturally droops under the support of the tool in the operation hole, the end of the cover body where the hanging shaft is located will face upward, which makes it convenient to put the hanging shaft into the hook.

[0021] Preferably, an indicator light is provided on the surface of the cover body, and the sensing part of the indicator light is electrically connected to the fuse. The on / off (or different colors) of the indicator light is used to indicate whether the fuse is blown (different states of the indicator light indicate whether the fuse is blown, and this function can be achieved through existing electrical means, and the specific electrical implementation means will not be repeated here). After the indicator light is provided, the staff can judge whether the fuse is blown from the outside, which can improve the convenience of inspection.

[0022] During specific implementation, heat dissipation holes, water-repellent holes, reinforcing ribs and other structures may also be provided on the box body and the cover body.

[0023] The beneficial technical effect of the present invention is: an outdoor low-voltage enclosed load disconnector with an assist mechanism is proposed, which can encapsulate all components of the disconnector in a shell, protect the metal parts on the disconnector, and effectively prevent foreign matter from being connected to the disconnector. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 , the side view of the present invention Figure 1 (the cover is in the closed state);

[0025] Figure 2 , the side view of the present invention Figure 2 (the cover is in the open state);

[0026] Figure 3 , a schematic diagram of the three-dimensional structure of the present invention;

[0027] Figure 4 , a schematic diagram of the three-dimensional structure of the box body;

[0028] Figure 5 , a schematic diagram of the cross-sectional structure of the present invention;

[0029] Figure 6 , a schematic cross-sectional view of the connection position between the contact blade and the stationary contact;

[0030] Figure 7 , schematic diagram of the three-dimensional structure of the elastic assist mechanism;

[0031] Figure 8 , a perspective view of the location of the elastic assist mechanism;

[0032] The names corresponding to the various marks in the figure are: box body 1, hook 1-1, mechanism compartment 1-2, cover body 2, hanging shaft 2-1, pull ring 2-2, operation hole 2-3, fuse 3, terminal 4, static contact 5, indicator light 6, contact knife 7, external wire A, mounting seat B, arc extinguishing cover C, contact part D, support shaft E. DETAILED DESCRIPTION

[0033] An outdoor low-voltage enclosed load isolating switch with a power-assisting mechanism, the structure of which is as follows: the outdoor low-voltage enclosed load isolating switch is composed of a box body 1, a cover body 2, a fuse 3, two wiring terminals 4, two static contacts 5 and two sets of elastic power-assisting mechanisms;

[0034] The fuse 3 is a knife-shaped fuse; the outer wall of the middle part of the fuse 3 is connected to the inner side of the cover 2, and the axial direction of the contact knife on the fuse 3 is parallel to the axial direction of the cover 2; two hanging shafts 2-1 are arranged on the outer wall of the lower end of the cover 2;

[0035] The static contact 5 is arranged on the bottom surface of the inner cavity of the box body 1, and the positions of the two static contacts 5 correspond one-to-one to the two contact blades on the fuse 3; the wiring terminal 4 is arranged on the bottom surface of the inner cavity of the box body 1, and the two wiring terminals 4 are isolated from each other; the wiring terminal 4 includes a contact connection end and a wire connection end, and the contact connection end is electrically connected to the static contact 5, and the two wiring terminals 4 correspond one-to-one to the two static contacts 5; the wire connection end is used to connect an external wire, and a hole matching the wire connection end is arranged on the box body 1, and the wire connection end is connected to the outside of the box body 1 through the hole;

[0036] When the cover 2 closes the opening of the inner cavity of the box body 1, the two contact blades on the fuse 3 are respectively inserted into the elastic slots of the two stationary contacts 5, and the elastic slots hold the contact blades tightly;

[0037] Two hooks 1-1 are arranged at positions corresponding to the hanging shaft 2-1 on the outer wall of the box body 1, and the two hooks 1-1 correspond to the two hanging shafts 2-1 one by one; when the box body 1 is erected, the hooks 1-1 are located at the lower end of the box body 1 and the openings of the hooks 1-1 face upwards; when the hanging shaft 2-1 is placed in the hooks 1-1, the cover body 2 can swing in the hook 1-1 along the circumferential direction of the hanging shaft 2-1; when the upper end of the cover body 2 swings to the maximum upward stroke position, the cover body 2 closes the opening of the inner cavity of the box body 1; the axial direction of the contact is parallel to the swinging plane of the cover body 2;

[0038] A mechanism compartment 1-2 is respectively arranged on the side walls on both sides of the axial direction of the box body 1, and two sets of elastic assist mechanisms are respectively arranged in the two mechanism compartments 1-2, and the direction of the opening of the mechanism compartment 1-2 is the same as the direction of the opening of the inner cavity of the box body 1; the support part of the elastic assist mechanism is connected to the inner wall of the mechanism compartment 1-2, and the contact part D of the elastic assist mechanism protrudes outside the mechanism compartment 1-2; a limiting groove is arranged on the contact part (D); two supporting shafts E are arranged on the inner side surface of the cover body 2, and the two supporting shafts E correspond to the two limiting grooves one by one; when the upper end of the cover body 2 is swung upward to a certain position, the supporting shaft E can enter the limiting groove through the opening of the limiting groove; after the supporting shaft E enters the limiting groove, the upper end of the cover body 2 can only swing downward to make the supporting shaft E escape from the limiting groove; when the cover body 2 is closed, the elastic assist mechanism can enable the cover body 2 to quickly close the opening of the inner cavity of the box body 1; when the cover body 2 is opened, the elastic assist mechanism can enable the cover body 2 to quickly separate from the box body 1;

[0039] The box body 1 and the cover body 2 are made of insulating materials.

[0040] Furthermore, an arc extinguishing cover is provided on the static contact 5 located on the upper side.

[0041] Furthermore, a pull ring 2-2 is provided on the surface of the cover body 2.

[0042] Furthermore, an operation hole 2 - 3 is provided on the lateral side wall at the lower end of the cover body 2 .

[0043] Furthermore, an indicator light is provided on the surface of the cover body 2 , and a sensing portion of the indicator light is electrically connected to the fuse 3 .

[0044] In the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them instead of being in direct contact. Moreover, the first feature being "above", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature. The terms "above", "below", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention.

[0045] It should be pointed out that the above embodiments are preferred implementation schemes of the present invention. In addition, the present invention may also be implemented in other ways. Without departing from the concept of the present technical solution, any obvious replacement, modification and deformation are within the protection scope of the present invention.

[0046] In addition, in order to enable ordinary technicians in the field to more easily understand the improvements of the present invention over the prior art, some drawings and common sense descriptions of the present invention have been simplified, and for the sake of clarity, some other elements are omitted in this application document. Ordinary technicians in the field should realize that these omitted elements may also constitute the content of the present invention.

Claims

1. An outdoor low-voltage enclosed load isolating switch with a power-assisting mechanism, characterized in that: The outdoor low-voltage enclosed load isolating switch is composed of a box body (1), a cover body (2), a fuse (3), two wiring terminals (4), two static contacts (5) and two sets of elastic assist mechanisms; The fuse (3) is a knife-shaped fuse; the outer wall of the middle part of the fuse (3) is connected to the inner side surface of the cover body (2); the axial direction of the contact knife on the fuse (3) is parallel to the axial direction of the cover body (2); two hanging shafts (2-1) are arranged on the outer wall of the lower end of the cover body (2); The stationary contact (5) is arranged on the bottom surface of the inner cavity of the box body (1), and the positions of the two stationary contacts (5) correspond one-to-one to the two contact blades on the fuse (3); the wiring terminal (4) is arranged on the bottom surface of the inner cavity of the box body (1), and the two wiring terminals (4) are isolated from each other; the wiring terminal (4) comprises a contact connection end and a wire connection end, the contact connection end is electrically connected to the stationary contact (5), and the two wiring terminals (4) correspond one-to-one to the two stationary contacts (5); the wire connection end is used to connect an external wire, and a hole matching the wire connection end is arranged on the box body (1), and the wire connection end is connected to the outside of the box body (1) through the hole; When the cover body (2) closes the opening of the inner cavity of the box body (1), the two contact blades on the fuse (3) are respectively inserted into the elastic slots of the two stationary contacts (5), and the elastic slots hold the contact blades tightly; Two hooks (1-1) are arranged at positions on the outer wall of the box body (1) corresponding to the hanging shaft (2-1), and the two hooks (1-1) correspond to the two hanging shafts (2-1) one by one; when the box body (1) is erected, the hooks (1-1) are located at the lower end of the box body (1) and the opening of the hooks (1-1) faces upwards; when the hanging shaft (2-1) is placed in the hooks (1-1), the cover body (2) can swing in the hook (1-1) along the circumferential direction of the hanging shaft (2-1); when the upper end of the cover body (2) swings to the maximum upward stroke position, the cover body (2) closes the opening of the inner cavity of the box body (1); the axial direction of the contact is parallel to the swinging plane of the cover body (2); A mechanism compartment (1-2) is provided on each of the side walls on both axial sides of the box body (1); two sets of elastic assist mechanisms are provided in the two mechanism compartments (1-2), respectively; the orientation of the opening of the mechanism compartment (1-2) is the same as the orientation of the opening of the inner cavity of the box body (1); the support portion of the elastic assist mechanism is connected to the inner wall of the mechanism compartment (1-2); the contact portion (D) of the elastic assist mechanism protrudes outside the mechanism compartment (1-2); a limiting groove is provided on the contact portion (D); two support shafts (E) are provided on the inner side surface of the cover body (2); The two support shafts (E) correspond to the two limit grooves one by one; when the upper end of the cover body (2) swings upward to a certain position, the support shaft (E) can enter the limit groove through the opening of the limit groove; after the support shaft (E) enters the limit groove, the upper end of the cover body (2) can only swing downward to make the support shaft (E) escape from the limit groove; when the cover body (2) is closed, the elastic assist mechanism can enable the cover body (2) to quickly close the opening of the inner cavity of the box body (1); when the cover body (2) is opened, the elastic assist mechanism can enable the cover body (2) to quickly separate from the box body (1); The box body (1) and the cover body (2) are made of insulating material.

2. The outdoor low-voltage enclosed load isolating switch with power-assist mechanism according to claim 1 is characterized in that: An arc extinguishing cover is provided on the static contact (5) located on the upper side.

3. The outdoor low-voltage enclosed load isolating switch with power-assist mechanism according to claim 1 or 2, characterized in that: A pull ring (2-2) is provided on the surface of the cover body (2).

4. The outdoor low-voltage enclosed load isolating switch with power-assist mechanism according to claim 3 is characterized in that: An operating hole (2-3) is provided on the transverse side wall at the lower end of the cover body (2).

5. The outdoor low-voltage enclosed load isolating switch with power-assist mechanism according to claim 1 or 2, characterized in that: An indicator light is provided on the surface of the cover body (2), and the sensing part of the indicator light is electrically connected to the fuse (3).

6. The outdoor low-voltage enclosed load isolating switch with power-assist mechanism according to claim 3 is characterized in that: An indicator light is provided on the surface of the cover body (2), and the sensing part of the indicator light is electrically connected to the fuse (3).

7. The outdoor low-voltage enclosed load isolating switch with power-assist mechanism according to claim 4 is characterized in that: An indicator light is provided on the surface of the cover body (2), and the sensing part of the indicator light is electrically connected to the fuse (3).

Images