Bridge contact with high short-time resistance

Abstract

The application discloses a bridge contact with high short-time resistance capacity, which comprises an insulating base, a conductive row contact finger assembly, a contact finger support, a contact finger spring, a rotating shaft and a limiting shaft, and is symmetrically arranged on the base; the conductive row contact finger assembly is sequentially welded by a conductive row, a flexible connection, a copper contact finger and a contact finger sheet; the rotating shaft and the limiting shaft are fixedly connected with the contact finger support after penetrating through the round hole and the oblong hole on the contact finger support and the copper contact finger; one end of the contact finger spring is connected in the round hole of the contact finger support, and the other end is connected in the groove of the copper contact finger. The new structure contact provided by the application has high short-time resistance capacity, compact structure and reliable connection.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of switch electric appliances, and particularly relates to a bridge contact with high short-time withstand capability and fast breaking speed for closing and opening a conductive loop. BACKGROUND

[0002] The bridge contact is a component of the switch electric appliance, can perform the closing and opening operation of the switch electric appliance, and can bear overload and short-circuit current.

[0003] With the development of the protection technology of the power system, the switch electric appliance is required to have higher short-time withstand capability and faster breaking speed, and the existing bridge contact cannot meet the requirement. SUMMARY

[0004] The application aims to provide a bridge contact with high short-time withstand capability according to the defects of the prior art, and realizes the compression contact between the moving contact and the static contact by adopting the multi-contact finger spring structure.

[0005] The technical scheme adopted by the application to solve the technical problem is as follows: a bridge contact with high short-time withstand capability, which comprises an insulating base, a conductive row contact finger assembly and a metal contact finger support arranged on the base respectively, and a contact finger spring arranged between the conductive row contact finger assembly and the contact finger support, the conductive row contact finger assembly is composed of a conductive row and copper contact fingers welded to the conductive row through a plurality of parallel soft connections, the copper contact fingers are respectively provided with a round hole and an oblong hole, and the end of the copper contact finger is welded with a contact finger sheet, the contact finger support is transversely provided with a rotating shaft and a limiting shaft, the contact finger support is internally provided with a grid-shaped parallel deep groove with the same number as the copper contact fingers, and the plurality of parallel copper contact fingers are arranged in the deep groove, the rotating shaft and the limiting shaft are respectively arranged through the round hole and the oblong hole of the copper contact finger and clamped with the contact finger support through a nut, one end of the contact finger spring is connected in the round hole of the contact finger support, and the other end is connected in the groove of the copper contact finger.

[0006] The bridge contact with high short-time withstand capability has a plurality of conductive row contact finger assemblies, contact finger supports and contact finger springs, which are symmetrically arranged on both sides of the base, and the conductive row contact finger assembly and the contact finger support are fixed on the base through a bolt.

[0007] The bridge contact with high short-time withstand capability adopts an insulating material with high insulating strength and mechanical strength, preferably an F881 or DMC insulating plate, and a plurality of parallel grooves are arranged on the contact surface between the conductive row contact finger assembly and the contact finger support in the middle of the symmetrically arranged conductive components, so that the creepage distance is increased.

[0008] The bridge contact with high short-time withstand capability has a threaded hole at the top of the finger support, the finger support is fixed with the base through bolts, the inside of the finger support has a grid-shaped parallel deep groove matched with the size of the copper finger, and a round hole for accommodating the finger spring is further formed on the finger support.

[0009] The bridge contact with high short-time withstand capability has a smooth middle section of the rotating shaft and the limiting shaft, and the surfaces of the rotating shaft, the limiting shaft and the copper finger and the finger support should be smooth surfaces to facilitate the relative rotation of the two components.

[0010] The bridge contact with high short-time withstand capability has a copper braid as the flexible connection, and the total number of the flexible connections and the number and diameter of the copper wires of a single flexible connection are defined according to the current carrying capacity.

[0011] The bridge contact with high short-time withstand capability has a groove formed at the upper end of the head of the copper finger, and the width of the groove is slightly larger than the outer diameter of the finger spring.

[0012] The application has the beneficial effects that the application provides a new contact structure for large current conduction, which has strong short-time withstand capability, high breaking speed, compact structure and reliable connection. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a schematic diagram of the opening position of the application;

[0014] Figure 2 It is a schematic diagram of the closing position of the application;

[0015] Figure 3 It is a structural schematic diagram of the finger assembly of the conducting row;

[0016] Figure 4 It is a structural schematic diagram of the finger support;

[0017] Figure 5 It is a structural schematic diagram of the conducting row.

[0018] The reference signs are as follows: 1-conducting row finger assembly, 1.1-conducting row, 1.2-flexible connection, 1.3-copper finger, 1.4-contact piece, 2-base, 3-finger support, 4-finger spring, 5-rotating shaft, 6-limiting shaft, and 7-moving contact. DETAILED DESCRIPTION

[0019] The application will be further described in detail below with reference to the drawings. The drawings of the described embodiments are shown in the drawings, and the same reference signs represent the same or similar elements or elements with the same or similar functions. The embodiments described below are exemplary and are intended to explain the application, and cannot be understood as a limitation of the application.

[0020] REFERENCE Figures 1 to 5The application discloses a high short-time resistance bridge contact, which comprises six parts, namely a conductive row contact finger assembly 1, a base 2, a contact finger support 3, a contact finger spring 4, a rotating shaft 5 and a limiting shaft 6. The conductive row contact finger assembly 1 and the contact finger support 3 are fixed on the base 2 by bolts, and the conductive row contact finger assembly 1 is below the base 2. The conductive row contact finger assembly 1 is sequentially welded by a conductive row 1.1, a plurality of parallel soft connections 1.2, copper contact fingers 1.3 and contact finger pieces 1.4. After welding, the length of each copper contact finger 1.3 is consistent. The upper part of the conductive row 1.1 is provided with holes for connecting with external circuits, and the size, number and arrangement type of the holes can be defined according to requirements. The middle part of the copper contact finger 1.3 is provided with round holes and long round holes for rotation and limiting, and the head of the copper contact finger 1.3 is welded with the contact finger piece 1.4 (such as silver-nickel alloy) which has small contact resistance, high temperature resistance and wear resistance. The rotating shaft 5 and the limiting shaft 6 are transversely arranged on the contact finger support 3. The contact finger support 3 is provided with sunken head holes on both sides for the rotating shaft 5 and the limiting shaft 6 to pass through and be fixed. The contact finger support 3 is internally provided with grid-shaped parallel deep grooves with the same number as the copper contact fingers 1.3. The plurality of parallel copper contact fingers 1.3 are arranged in the deep grooves of the contact finger support 3. The contact finger support 3 is provided with threaded holes at the top for being fixed on the base 2 by bolts. The contact finger support 3 is provided with sunken head holes at both sides for the rotating shaft 5 and the limiting shaft 6 to pass through and be fixed. The contact finger support 3 is internally provided with grid-shaped parallel deep grooves with the same size as the copper contact fingers 1.3. The contact finger support 3 is further provided with round holes for accommodating the contact finger spring 4. The rotating shaft 5 and the limiting shaft 6 pass through the sunken head holes of the contact finger support 3 and the round holes and long round holes of the copper contact fingers 1.3, and are fixed by being clamped by nuts and the contact finger support 3. One end of the contact finger spring is arranged in the round hole of the contact finger support 3, and the other end is arranged in the groove of the copper contact finger 1.3. The copper contact finger 1.3 can rotate around the rotating shaft 5 in the process of closing and opening, and is limited by the limiting shaft 6 in the open state. The moving contact 7 is limited by the lower end of the contact finger support 3 in the closed state.

[0021] Further, the conductive row contact finger assembly 1, the contact finger support 3, the contact finger spring 4, the rotating shaft 5 and the limiting shaft 6 are symmetrically arranged on both sides of the base 2. The left end and the right end are the wire inlet end and the wire outlet end. The distance between the two sides is determined according to the rated voltage level of the circuit. The arrangement type can ensure that the stress and stroke of the copper contact fingers 1.3 on both sides are equal, the stress is balanced, and the structure is stable. The conductive row contact finger assembly 1 and the contact finger support 3 are fixed on the base 2 by bolts.

[0022] Further, the base 2 should be made of an insulating material with high insulation strength and high mechanical strength, such as F881 or DMC. A certain number of parallel grooves can be designed between the conductive parts to increase the creepage distance.

[0023] Further, the upper opening of the conductive row 1.1 is used for connecting with external circuit, and the size, number and arrangement type of the opening can be defined according to the requirement; the inside of the conductive row 1.1 is provided with a plurality of welding grooves with equal width and equal interval, which are used for inserting and welding the soft connection 1.2.

[0024] Further, the soft connection 1.2 is copper braid, and the total number of the soft connection 1.2, the number of copper wires of the single soft connection 1.2 and the wire diameter are defined according to the current carrying capacity; the upper end of the head of the copper contact finger 1.3 is provided with a slot, and the width of the slot is slightly larger than the outer diameter of the contact finger spring 4; the middle part of the copper contact finger 1.3 is respectively provided with a round hole and an oblong hole, which are used for rotating and limiting; the lower end of the head is welded with a contact finger sheet 1.4 (such as silver-nickel alloy) with small contact resistance, high temperature resistance and wear resistance.

[0025] Further, the middle part of the rotating shaft 5 and the limiting shaft 6 is a smooth surface, and the surfaces of the rotating shaft 5, the limiting shaft 6 and the copper contact finger 1.3 and the contact finger support 3 should be smooth surfaces, so that the two components can rotate relative to each other, and the head is externally threaded or provided with an opening, which can be fixed by thread connection, split pin or split retainer.

[0026] The working process of the present application is as follows: when the bridge contact is in the open position, the moving contact 7 has a certain gap with the contact, at this time the copper contact finger 1.3 is kept downward to the limiting position of the limiting shaft 6 by the reaction force of the contact finger spring 4; when the bridge contact is closed, the moving contact 7 moves upward and contacts the contact sheet 1.4, which pushes the copper contact finger 1.3 to overcome the reaction force of the contact finger spring 4 and moves upward around the rotating shaft until the moving contact 7 contacts the lower edge of the contact finger support 3 and is limited. Therefore, when the bridge contact is in the closed position, each copper contact finger 1.3 has a larger pressure between the moving contact 7 and the contact finger spring 4 in the compressed state, which can resist the electric force generated by the larger short-circuit current, indicating that the bridge contact has high short-time withstand capability.

[0027] The above embodiments only illustrate the principles and effects of the present application, and part of the embodiments are applied, and those skilled in the art can make several modifications and improvements without departing from the concept of the present application, which belongs to the protection scope of the present application.

Claims

1. A high short time resistance capable bridge contact, characterized by: The utility model relates to a kind of copper contactor, including insulating base (2) and respectively arranged on the base (2) conductive row contact finger assembly (1) and metal contact finger support (3), still including the contact finger spring (4) being arranged between conductive row contact finger assembly (1) and contact finger support (3), the conductive row contact finger assembly (1), contact finger support (3) and contact finger spring (4) have multiple, symmetrically arranged on the both sides of base (2), the conductive row contact finger assembly (1) and contact finger support (3) are fixed on base (2) by bolt, the conductive row contact finger assembly (1) is composed of conductive row (1.1) and copper contact finger (1.3) being connected with conductive row (1.1) by several side-by-side soft connections (1.2), copper contact finger (1.3) is respectively opened with round hole and long round hole, copper contact finger (1.3) end connects contact finger piece (1.4), the contact finger support (3) is laterally provided with rotating shaft (5) and limiting shaft (6), contact finger support (3) is internally provided with side-by-side deep groove, several side-by-side copper contact fingers (1.3) are loaded in the deep groove, the rotating shaft (5) and limiting shaft (6) are respectively passed through the round hole and long round hole on copper contact finger (1.3) after with contact finger support (3) opposite fixed, contact finger spring (4) one end connects contact finger support (3), the other end connects copper contact finger (1.3).

2. A high short time withstand capability bridge contact according to claim 1, characterized in that The base (2) is made of F881 or DMC insulating plate, and the contact surface of the base (2) with the conductive row contact finger assembly (1) and the contact finger support (3) is provided with side-by-side grooves.

3. A high short-time resistance bridge contact according to claim 1 or 2, characterized in that The contact finger support (3) has a threaded hole at the top, and the contact finger support (3) is fixed with the base (2) by a bolt. The contact finger support (3) has side-by-side deep grooves in the inside which are matched with the size of the copper contact finger (1.3). The contact finger support (3) is also provided with a round hole for accommodating the contact finger spring (4).

4. A high short time withstand capability bridge contact according to claim 3, characterized in that The rotating shaft (5) and the limiting shaft (6) have smooth middle sections.

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