A resistance-free connector

Abstract

A resistance-free plug connector includes a conductive sheet and an internal terminal. The conductive sheet includes a left connecting sheet and a right connecting sheet. One end of the left connecting sheet and the right connecting sheet is fixedly connected or abutted against the internal terminal, and the other ends of the left connecting sheet and the right connecting sheet are close to or in contact with each other. An expansion mechanism is provided at the left connecting sheet and the right connecting sheet, and the left connecting sheet and the right connecting sheet are linked to the expansion mechanism. A pressure spring abuts against the left connecting sheet and the right connecting sheet. Before plugging with the external terminal, one end of the conductive sheet is opened by a cam contact to achieve resistance-free plugging with the external terminal, which can fundamentally avoid the wear of the plug-in contact and the external terminal and maximize the service life of the connector. Since resistance-free plugging is achieved, there is no need to install any auxiliary force-adding propulsion mechanism, and it can be directly operated by manpower. The designed arc-shaped conductive sheet and pressure spring can significantly increase the pressing force of the plug-in contact, reduce contact heating, and reduce the risk of electrical fire.

Description

Technical Field

[0001] The invention relates to a plug connector of a switch cabinet, in particular to a resistance-free plug connector. Background Art

[0002] Among the low-voltage distribution cabinets currently used in China, a large part are withdrawable switch cabinets, such as GCS, GCK, MNS and other cabinet types. Withdrawable switch cabinets must use primary connectors, and the current primary connectors must solve the problem of heating of their own contacts, so they either increase the number of plug-in contacts or make the opening gap of the plug-in contacts very small to increase the bite pressure. Considering the economic cost, the method of reducing the contact opening gap is generally adopted. However, it brings at least two negative factors. First, due to the increase in contact bite pressure, the resistance will be very large when the plug is plugged in, so the thrust must be increased, and many existing mechanisms are difficult to implement; second, due to the increase in contact bite pressure, the friction force during plugging will increase, which will greatly increase the wear of the contacts. Wear destroys the conductive coating on the one hand, and accelerates the attenuation of the crimping force on the other hand. Summary of the invention

[0003] In view of the problems in the prior art, the present invention provides a resistance-free plug connector.

[0004] A resistance-free connector includes a conductive sheet and an internal terminal, characterized in that: the conductive sheet includes a left connecting sheet and a right connecting sheet, one end of the left connecting sheet and the right connecting sheet is fixedly connected to or abuts against the internal terminal, and the other ends of the left connecting sheet and the right connecting sheet are close to or in contact with each other, and are used to contact with the external terminal; an expansion mechanism is provided at the left connecting sheet and the right connecting sheet, and the left connecting sheet and the right connecting sheet are linked to the expansion mechanism; and a pressure spring abuts against the left connecting sheet and the right connecting sheet.

[0005] The working principle of the present invention is as follows: before the connector is plugged in, the expansion mechanism is actuated to open the contact ends of the left connecting piece and the right connecting piece, thereby forming a plug-in interface; after the external terminal is inserted into the plug-in interface, the expansion mechanism is restored, and the left connecting piece and the right connecting piece are pressed against the external terminal by the action of a pressure spring.

[0006] Further, the expansion mechanism includes a rotatably arranged cam contact, and the two sides of the cam contact are respectively attached to the inner walls of the left connecting piece and the right connecting piece. The cam rotates to expand the left connecting piece and the right connecting piece, and the contact ends of the left connecting piece and the right connecting piece are separated.

[0007] Further, the cam contact is oval-shaped, the cam contact is located in the middle of the left connecting piece and the right connecting piece, and a contact block is integrally provided on the inner wall of the left connecting piece and the right connecting piece at the position corresponding to the cam contact, and the position of the contact block that contacts the cam contact is an inner arc. The matching structure between the cam contact and the contact block is stable and has a long service life.

[0008] Further, the left connecting piece and the right connecting piece are both arc-shaped structures and are arranged facing each other, the pressure spring is an arc-shaped spring pressure piece, the pressure spring is buckled on the outside of the left connecting piece and the right connecting piece, the two ends of the pressure spring are respectively abutted against the two end portions of the left connecting piece or the right connecting piece, and the middle of the pressure spring is fixedly arranged. The left connecting piece, the right connecting piece and the pressure spring structure are all simple arc-shaped structures, but the elasticity is small after assembly, which facilitates the left connecting piece and the right connecting piece to stably clamp and press the external terminal.

[0009] Further, it includes a support frame and an insulating connection column, wherein the insulating connection column is rotatably mounted on the support frame, one end of the insulating connection column is fixedly connected to the center point of the cam contact, and the other end of the insulating connection column is fixedly connected to a hand wheel. The cam contact is rotated by rotating the hand wheel, thereby indirectly controlling the opening and closing of the conductive sheet.

[0010] The beneficial effects of the present invention are as follows: 1. Before plugging with the external terminal, one end of the conductive sheet is opened by the cam contact so as to achieve resistance-free plugging with the external terminal, which can fundamentally avoid the wear of the plug-in contact (conductive sheet) and the external terminal and maximize the service life of the connector;

[0011] 2. Since there is no resistance to plugging in, there is no need to install any auxiliary booster mechanism, and it can be operated directly by manpower;

[0012] 3. The designed arc-shaped conductive sheet and pressure spring can significantly increase the clamping force of the plug-in contact, reduce contact heating, and reduce the risk of electrical fire;

[0013] 4. The invention is easy to operate, requires little operating force, and has a high cost-effectiveness ratio. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a front view structural schematic diagram of the present invention;

[0015] Figure 2 It is a side view structural schematic diagram of the present invention;

[0016] Figure 3 It is a schematic diagram of the top view of the structure of the present invention;

[0017] Figure 4 This is a schematic diagram of the state before plugging in the present invention;

[0018] Figure 5 It is a schematic diagram of the plugged-in state of the present invention.

[0019] In the figure, 1. conductive sheet; 11. contact block; 2. pressure spring; 3. cam contact; 4. insulating connecting column; 5. support frame; 6. internal terminal; 7. external terminal; 8. hand wheel. DETAILED DESCRIPTION

[0020] The present invention is described in detail below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be interpreted as limiting the present invention. It should be noted that the directional terms such as left, middle, right, top, and bottom in the examples of the present invention are only relative concepts or are based on the normal use state of the product, and should not be considered as restrictive.

[0021] A resistance-free connector comprises a conductive sheet 1 and an internal terminal 6, wherein the conductive sheet 1 comprises a left connecting sheet and a right connecting sheet of identical structure and symmetrical to each other, wherein one end of the left connecting sheet and the right connecting sheet are fixedly connected or abutted (pressed) on the internal terminal 6, and the other ends of the left connecting sheet and the right connecting sheet are close to or in contact with each other; an expansion mechanism is provided at the left connecting sheet and the right connecting sheet, and the left connecting sheet and the right connecting sheet are linked to the expansion mechanism; and a pressure spring 2 abuts against the left connecting sheet and the right connecting sheet.

[0022] Wherein, the expansion mechanism includes a rotatably arranged cam contact 3, and the two sides of the cam contact 3 are respectively affixed to the inner walls of the left connecting piece and the right connecting piece; the cam contact 3 is elliptical, and the cam contact 3 is located in the middle of the left connecting piece and the right connecting piece, and a contact block 11 is integrally arranged on the inner wall of the left connecting piece and the right connecting piece at a position corresponding to the cam contact 3, and the position on the contact block 11 that contacts with the cam contact 3 is an inner arc shape; the left connecting piece and the right connecting piece are both arc-shaped structures and are arranged facing each other, and the pressure spring 2 is an arc-shaped spring pressing piece, and the pressure spring 2 is buckled on the outer side of the left connecting piece and the right connecting piece, and the two ends of the pressure spring 2 are respectively abutted against the two end ends of the left connecting piece or the right connecting piece, and the middle part of the pressure spring 2 is fixedly arranged.

[0023] In addition, it includes a support frame 5 and an insulating connecting column 4, wherein the insulating connecting column 4 is rotatably mounted on the support frame 5, one end of the insulating connecting column 4 is fixedly connected to the center point of the cam contact 3, and the other end of the insulating connecting column 4 is fixedly connected to a hand wheel 8.

[0024] The working principle of the present invention is as follows: before the plug connector is plugged in, the expansion mechanism is activated to open the contact ends of the left and right connecting pieces, thereby forming a plug interface. After the external terminal is inserted into the plug interface, the expansion mechanism is restored, and the left and right connecting pieces press the external terminal under the action of the pressure spring. Among them, the hand wheel is turned, and the hand wheel rotates the cam contact through the insulating connecting column. After the cam contact rotates, the long axis side pushes the contact block to move toward the outside of the conductive sheet, so that the left and right connecting pieces are opened.

[0025] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A resistance-free plug connector, comprising a conductive sheet and an internal terminal, characterized in that: The conductive sheet comprises a left connecting sheet and a right connecting sheet, one end of the left connecting sheet and the right connecting sheet is fixedly connected or abutted against the internal terminal, and the other ends of the left connecting sheet and the right connecting sheet are close to or in contact with each other; an expansion mechanism is provided at the left connecting sheet and the right connecting sheet, and the left connecting sheet and the right connecting sheet are linked with the expansion mechanism; a pressure spring abuts against the left connecting sheet and the right connecting sheet; the expansion mechanism comprises a rotatably arranged cam contact, and the two sides of the cam contact are respectively attached to the inner walls of the left connecting sheet and the right connecting sheet; the cam contact is elliptical The cam contact is located in the middle of the left connecting piece and the right connecting piece, and contact blocks are integrally provided on the inner walls of the left connecting piece and the right connecting piece at positions corresponding to the cam contacts, and the position on the contact block that contacts the cam contact is an inner arc shape; the left connecting piece and the right connecting piece are both arc-shaped structures and are arranged facing each other, and the pressure spring is an arc-shaped spring pressing piece, and the pressure spring is buckled on the outer side of the left connecting piece and the right connecting piece, and the two ends of the pressure spring respectively abut against the two end ends of the left connecting piece or the right connecting piece, and the middle part of the pressure spring is fixedly arranged.

2. A resistance-free connector according to claim 1, characterized in that: It comprises a support frame and an insulating connection column, wherein the insulating connection column is rotatably mounted on the support frame, one end of the insulating connection column is fixedly connected to the center point of the cam contact, and the other end of the insulating connection column is fixedly connected to a hand wheel.

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