Load switch

Abstract

The utility model relates to the technical field of load switches, and provides a load switch, which comprises a switch bracket, a plurality of inner brackets are arranged in the switch bracket, a movable knife rest is arranged in each inner bracket, and a gas driving and injection system consisting of a piston, a connecting rod, a gas cylinder and an injection head is introduced. The movable knife rest rotates to be connected with a connecting rod of the piston, the piston is driven to move up and down when the movable knife rest is switched at different positions, then gas in the gas cylinder is extruded out, and the gas is accurately injected to the tip of the arc striking strip protruding from the injection head to the static blade. On one hand, the design that the end part of the arc striking strip protrudes out of the static blade efficiently gathers the opening arc to the tip according to the electric field principle, thereby laying a foundation for subsequent accurate arc extinguishing; and on the other hand, the gas ejected by the injection head directly strikes the tip of the arc striking strip, so that ions and heat generated by point discharge can be blown away, a stable arc extinguishing environment is created, re-aggregation of the arc can be inhibited, and generation of the arc and electromagnetic interference are effectively prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to load switch technical field, especially a load switch. BACKGROUND

[0002] Load switch is a kind of switch electrical apparatus between circuit breaker and disconnecting switch, can automatically trip and cut off circuit under certain overload current (usually overload current in the specified time), but cannot cut off short-circuit current switch electrical apparatus, it is mainly used in 35kV and below distribution network and industrial, civil and other low-voltage distribution system, it is an important distribution equipment;

[0003] Greater voltage can produce intense arc at the instant of contact breaking, and the high temperature of arc can make the surface material of contact melt and vaporize rapidly, and the frequent arc action under high voltage can lead to the burning of contact for some load switches using copper or copper alloy contact, so as to increase the contact resistance of contact.

[0004] Increased contact resistance can further reduce the performance and service life of contact under normal working current, and the metal vapor and ions generated by arc can form an insulating cover layer on the surface of contact, which affects the conductivity of contact. SUMMARY

[0005] The utility model discloses a load switch, adopt the device to work to solve the above -mentioned problem.

[0006] In order to solve the above technical problem, the utility model provides the following technical scheme: a load switch, including switch support, the inside of switch support is installed with a plurality of inner supports, the inside of each inner support is provided with dynamic knife holder, the end of dynamic knife holder is provided with contact blade, the inside of switch support is transversely penetrated by drive shaft, drive shaft rotation is arranged in the inside of switch support, dynamic knife holder is fixed on drive shaft, the bottom of inner support is provided with conducting rod, the front end in the inside of inner support is provided with ground contact seat, the top of inner support is provided with static contact seat, the bottom of static contact seat is provided with static blade, the bottom of static blade is provided with arc strip, the rear end of inner support is provided with blow arc subassembly.

[0007] Preferably, the front end of the arc strip protrudes from the front end of the static blade, and the front end of the arc strip is relatively sharp.

[0008] Preferably, the blow arc subassembly includes a gas cylinder disposed at the rear end of the inner support, the gas cylinder has a piston disposed therein, the bottom end of the piston is hingedly connected to a connecting rod, the bottom end of the connecting rod is hingedly connected to the dynamic knife holder, and the top front end of the gas cylinder is provided with a blowing head on both sides.

[0009] Preferably, the blowing head on each side of the top front end of the air cylinder is located on the two sides of the static blade, the blowing head is connected with the inside of the air cylinder, and the air duct inside the blowing head is inclined downward and towards the tip of the arc leading strip.

[0010] Compared with the prior art, the utility model has the advantages that:

[0011] The utility model provides a kind of load switch, and the drive assembly is connected to one side of drive shaft, and drive assembly is linked with drive shaft, and drives dynamic knife rest to rotate in inner support, realizes switching to grounding contact seat or static blade position, defines three key states of closing position a, grounding position b, opening position c.In arc extinguishing link, introduce piston, connecting rod, air cylinder and blowing head to form gas drive and injection system.By the connecting rod connection of dynamic knife rest rotation and piston, utilize dynamic knife rest to drive piston to move up and down when converting in different positions, then extrude gas in air cylinder, and the arc leading strip tip of blowing head protruding design is accurately sprayed to static blade.One aspect, the design of arc leading strip end protruding from static blade, according to electric field principle, high-efficiency gathers opening arc to tip, and lays foundation for subsequent accurate arc extinguishing;The other aspect, gas that blowing head sprays directly hits arc leading strip tip, can blow away ion and heat generated by tip discharge, creates stable arc extinguishing environment, can also inhibit arc to gather again, effectively prevent arc generation and electromagnetic interference.Greatly improve the safety of load switch opening instant, avoid equipment damage caused by high arc, guarantee power system stable operation;It also prolongs the service life of load switch, reduces the risk of contact burning failure, reduces operation and maintenance cost, provides strong support for the efficiency and reliability of power distribution. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is load switch opening state structure schematic view of the utility model;

[0013] Figure 2 It is load switch opening state structure sectional view of the utility model;

[0014] Figure 3 It is load switch closing state structure sectional view of the utility model; Figure 2 It is enlarged structure schematic view of place A;

[0015] Figure 4 It is load switch opening state side view structure sectional view of the utility model;

[0016] Figure 5 It is load switch closing state structure sectional view of the utility model;

[0017] Figure 6 It is load switch grounding state structure sectional view of the utility model.

[0018] The reference signs in the drawing are explained as follows: 1, switch support; 2, driving shaft; 21, moving knife holder; 22, contact blade; 23, conductive rod; 24, grounding contact seat; 3, inner support; 31, static contact seat; 32, static blade; 33, arc striking strip; 4, air cylinder; 41, piston; 42, connecting rod; 43, blowing head. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0020] In order to further understand the content of the present application, the present application will be described in detail in combination with the drawings.

[0021] In combination with Figures 1 to 6 the drawings, the present application is a load switch, which comprises a switch support 1, a plurality of inner supports 3 are installed in the inside of the switch support 1, a moving knife holder 21 is arranged in the inside of each inner support 3, a contact blade 22 is arranged at the end of the moving knife holder 21, a driving shaft 2 is transversely penetrated in the inside of the switch support 1, the driving shaft 2 is rotationally arranged in the inside of the switch support 1, the moving knife holder 21 is fixed on the driving shaft 2, a conductive rod 23 is arranged at the bottom of the inner support 3, a grounding contact seat 24 is arranged at the front end in the inside of the inner support 3, a static contact seat 31 is arranged at the top of the inner support 3, a static blade 32 is arranged at the bottom end of the static contact seat 31, an arc striking strip 33 is arranged at the bottom end of the static blade 32, a blowing arc assembly is arranged at the rear end of the inner support 3, the front end of the arc striking strip 33 protrudes from the front end of the static blade 32, and the front end of the arc striking strip 33 is relatively sharp.

[0022] The blowing arc assembly comprises an air cylinder 4 arranged at the rear end of the inner support 3, a piston 41 is arranged in the inside of the air cylinder 4, the bottom end of the piston 41 is hingedly connected with a connecting rod 42, the bottom end of the connecting rod 42 is hingedly connected with the moving knife holder 21, blowing heads 43 are arranged at the top front end of the air cylinder 4, each blowing head 43 is arranged at the side of the static blade 32, the blowing head 43 is in communication with the inside of the air cylinder 4, and the air duct in the inside of the blowing head 43 is inclined downward and faces the sharp end of the arc striking strip 33.

[0023] Working principle:

[0024] A driving assembly is arranged at one side of the driving shaft 2, the driving assembly drives the driving shaft 2 to rotate, so that the moving knife holder 21 in the inner support 3 can rotate to the position facing the grounding contact seat 24 or the position facing the static blade 32;

[0025] When the contact blade 22 at the end of the moving knife holder 21 rotates to the position of the static blade 32, which is the closing state, as shown in FIG. 3, the position is set as a; when the contact blade 22 at the end of the moving knife holder 21 rotates to the position of the grounding contact 24, which is the grounding state, as shown in FIG. 4, the position is set as b; when the contact blade 22 at the end of the moving knife holder 21 rotates to the position as shown in FIG. 5, which is the opening state, the position is set as c. Figure 5 Figure 6 Figure 2

[0026] When the moving knife holder 21 rotates to the position of a, the moving knife holder 21 pulls down the piston 41 through the connecting rod 42 to move to the lowermost position in the air cylinder 4; when the moving knife holder 21 rotates from a to c, the moving knife holder 21 pushes up the piston 41 through the connecting rod 42 to move to the middle position in the air cylinder 4; when the moving knife holder 21 rotates from c to b, the moving knife holder 21 pushes up the piston 41 through the connecting rod 42 to move to the uppermost position in the air cylinder 4; during the rotation of the moving knife holder 21 from a to c and then to b, the piston 41 moves upward step by step from the lowermost position in the air cylinder 4, and the gas in the air cylinder 4 is squeezed out and sprayed through the blowing head 43 towards the tip of the arc leading strip 33, so as to blow the arc at the tip of the arc leading strip 33 by using the gas, thereby performing arc extinguishing work to prevent a large arc from being generated at the moment when the static blade 32 and the contact blade 22 are opened.

[0027] It should be noted that an arc will be generated when the static blade 32 and the contact blade 22 are opened, and the arc leading strip 33 is used to conduct the arc, and the end of the arc leading strip 33 is designed to protrude from the static blade 32, so that the arc can be more easily gathered at the protruding part. Because the electric field is more concentrated at the tip, according to the basic principle of electric field, the distribution of electric charge on the surface of the conductor is uneven, and the charge density is higher at the sharp part, so this protruding design is beneficial to concentrating the arc generated by opening to the tip of the arc leading strip 33.

[0028] The gas sprayed by the blowing head 43 is used for arc blowing operation, and the tip of the arc leading strip 33 is protruding, so that the gas can more accurately act on the position where the arc is gathered. If the arc leading strip 33 is flush with the static blade 32, the gas may be dispersed on the surface of the static blade 32 and the surface of the arc leading strip 33, and it is difficult to effectively act on the key area where the arc is gathered.

[0029] ​​​The gas sprayed by the spraying head 43 acts on the tip of the arc striking strip 33. When the gas blows to the tip, on the one hand, the gas can blow away the ions and heat generated by the tip discharge; on the other hand, the gas can inhibit the arc from gathering again at the tip of the arc striking strip 33, preventing the arc from being too high to cause other adverse consequences, such as arc generation or electromagnetic interference on the surrounding equipment, etc. In this way, the arc blowing operation can be efficiently performed, and the large arc generated at the moment of the separation of the static blade 32 and the contact blade 22 can be reduced.

[0030] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one entity or action from another, without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0031] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A load switch, comprising a switch bracket (1), characterized in that: Multiple inner supports (3) are installed inside the switch bracket (1). Each inner support (3) is equipped with a moving blade holder (21). The end of the moving blade holder (21) is equipped with a contact blade (22). A drive shaft (2) runs horizontally through the inside of the switch bracket (1). The drive shaft (2) is rotatably installed inside the switch bracket (1). The moving blade holder (21) is fixed on the drive shaft (2). A conductive rod (23) is installed at the bottom of the inner support (3). A grounding contact seat (24) is installed at the front end of the inner support (3). A stationary contact seat (31) is installed at the top of the inner support (3). A stationary blade (32) is installed at the bottom end of the stationary contact seat (31). An arc-inducing strip (33) is installed at the bottom end of the stationary blade (32). An arc-blowing assembly is installed at the rear end of the inner support (3).

2. A load switch according to claim 1, characterized in that: The front end of the arc-inducing bar (33) protrudes beyond the front end of the stationary blade (32), and the front end of the arc-inducing bar (33) is relatively sharp.

3. A load switch according to claim 2, characterized in that: The arc blowing assembly includes an air cylinder (4) located at the rear end of the inner support (3). A piston (41) is installed inside the air cylinder (4). A connecting rod (42) is hinged to the bottom end of the piston (41). The bottom end of the connecting rod (42) is hinged to the moving knife holder (21). Blowing heads (43) are installed on both sides of the front end of the top of the air cylinder (4).

4. A load switch according to claim 3, characterized in that: The nozzles (43) on both sides of the top front end of each air cylinder (4) are located on both sides of the stationary blade (32). The nozzles (43) are connected to the inside of the air cylinder (4). The air duct inside the nozzles (43) is inclined downward and faces the tip of the arc-drawing strip (33).

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