CN210040614U - Screw Terminal Blocks for Resistance Tubes with Male Thread Terminals - Google Patents

Abstract

The utility model relates to a load box technical field, in particular to bolt type binding post that resistance tube used to external screw thread wiring end. The bolt type wiring terminal used by the resistance tube aiming at the external thread wiring terminal is vertically connected with the wiring terminal of the resistance tube along the axial direction, so that the problem that the conventional terminal is directly contacted with the adjacent metal tube connecting sheet can be avoided. And the torque wrench is more convenient to mount, so that the bolt tightening torque can be guaranteed, and the current-carrying capacity of connection of the large-section lead can be guaranteed. And moreover, the bolt type wiring terminal used by the resistance tube aiming at the external thread wiring terminal in different sizes can be manufactured according to the cables and the resistance tubes with different section sizes, and the applicability is realized. In addition, the bolt type wiring terminal used for the resistance tube aiming at the external thread wiring terminal is in compression joint with the conductive inner core of the cable, so that the fixed nut does not need to be worried about to drop in the dismounting and mounting processes, and the maintenance safety is indirectly ensured.

Description

Screw Terminal Blocks for Resistance Tubes with Male Thread Terminals

technical field

The utility model relates to the technical field of load boxes, in particular to a bolt-type connection terminal used for a resistance tube with an external thread connection terminal.

Background technique

Load box is a kind of power testing equipment, which is mainly used to test the load performance of generators, uninterruptible power supply (UPS), power transmission equipment, etc. The load box is the main tool for these equipment to complete periodic testing, maintenance and other tests. The resistance tube of the load box needs to be led out to the cable through the terminal. The conventional terminal installation structure is shown in Figure 1. The terminals A1 and A2 are provided with a sleeve at one end for fixing the high-voltage wire, the bushing terminal and other structures. The other end is provided with a connecting piece A11 with a mounting hole. Use the bolt B to pass through the mounting holes of the connecting terminals A1 and A2 together and tighten them so that the connecting pieces of the two connecting terminals are in close contact, and the two connecting terminals can be realized. Electrical connections between connected structures.

With the complexity of load box equipment, there are more and more load tubes that need to be connected to terminals. Each terminal is densely arranged on the same installation plane, and almost all cable wires are connected to adjacent resistance tube terminals and connections. sheet in direct contact. During the installation and wiring process of the resistance tube of the load box, it is easy to occur that the bolts are not installed in place due to the small operating space and the inappropriate size of the wrench, which makes the connection between the two terminals not tight enough, resulting in a decrease in the quality of the wiring. Moreover, because the terminals are too dense on the installation plane, the insulating sheath of the cable is easy to contact the metal connecting pieces or bolts of the terminal, and the long-term contact can easily cause damage to the cable insulating sheath, especially the cable and the adjacent metal pipes. The edges and corners of the connecting piece are in direct contact, and the terminal will transmit a weak current to the cable for a long time, which will cause the cable to heat up and be prone to short-circuit accidents. In addition, if the ordinary nut is used, the small nut is easy to fall off during maintenance, disassembly and installation, and there are a large number of medium-voltage switch devices in the terminal installation position of the resistance tube, which is easily caused by the lost small nut. Short circuit accident.

SUMMARY OF THE INVENTION

In order to avoid the deficiencies in the above-mentioned prior art, the present invention provides a bolt-type connection terminal used for a resistance tube with an external thread connection terminal, which is convenient for disassembly and installation and can save installation space.

The purpose of the present utility model is achieved through the following technical solutions:

Provides a screw-type terminal for resistance tubes with external thread terminals, the terminal is connected between a cable and a resistance tube, and includes a sleeve for fixing on the cable side and a terminal for connecting with the resistance tube. The inner diameter of the sleeve and the coil are coaxially connected, and the inner diameter of the sleeve is larger than the inner diameter of the coil, the sleeve is inserted into the conductive inner core of the cable and the two are crimped, The terminal of the resistance tube is of an external thread structure, the coil is provided with an internal thread matching the external thread structure, and the terminal of the resistance tube is screwed into the coil to contact the electrical conductivity of the cable. Inner core.

Wherein, the outer side of the spiral tube is a polygonal prismatic structure.

Wherein, the polygonal prism structure is a regular hexagonal prism.

Wherein, the sleeve and the solenoid are rotatably connected.

Wherein, the end face of the sleeve close to the spiral tube extends towards the center of the circle to form an annular baffle, the end face of the coil close to the sleeve extends away from the center of the circle to form an annular clamping plate, and the inner ring diameter of the annular baffle is larger than The outer diameter of the coil is smaller than the outer diameter of the annular clamping plate on the coil.

Wherein, the bolt-type terminal used for the resistance tube of the external thread terminal is wrapped with a heat shrinkable tube.

Wherein, the heat-shrinkable tube is a PET heat-shrinkable hose or a PVC heat-shrinkable sleeve.

The beneficial effects of the present utility model:

The bolt-type terminal and the resistance tube terminal used in the resistance tube for the external thread terminal are connected vertically along the axis direction, which can avoid the problem of direct contact between the conventional terminal and the adjacent metal tube connecting piece. In addition, it is more convenient to install with a torque wrench, which can not only ensure the bolt tightening torque, but also ensure the current carrying capacity of the large-section wire connection. In addition, the bolt-type terminal used for the resistance tube of the external thread terminal is crimped with the conductive inner core of the cable, and there is no need to worry about the loss of the fixing nut during the disassembly and installation process, which indirectly ensures the maintenance. Safety.

Description of drawings

The present invention will be further described by using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the present invention. For those of ordinary skill in the art, under the premise of no creative work, the following drawings can also be used to obtain Additional drawings.

FIG. 1 is a schematic diagram of an installation structure of a connection terminal in the prior art.

2 is a schematic diagram of the overall structure of the bolt-type terminal used for the resistance tube of the external thread terminal of the present invention.

3 is a schematic diagram of the installation structure of the bolt-type terminal used for the resistance tube of the external thread terminal of the present invention.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects solved by the present utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not intended to limit the present invention.

As shown in FIG. 2 , the terminal made of conductive metal is connected between the cable 2 and the resistance tube 3 , including a sleeve 11 for fixing on the side of the cable 2 and a screw for connecting with the terminal of the resistance tube 3 Tube 12. The sleeve 11 is for inserting the conductive inner core 21 of the cable 2 and the two are crimped. The terminal of the resistance tube 3 is an external thread structure. The ends are screwed into the solenoid 12 to contact the conductive inner core 21 of the cable 2 (see Figure 3). The inner diameters of the sleeve 11 and the coil 12 are coaxially communicated, and the inner diameter of the sleeve 11 is larger than the inner diameter of the coil 12 . The sleeve 11 and the coil 12 are rotatably connected. Specifically, the end face of the sleeve 11 close to the coil 12 extends toward the center of the circle to form an annular baffle 111, and the end face of the coil 12 close to the sleeve 11 extends away from the center to form an annular clamp. For the plate 121 , the inner diameter of the annular baffle 111 is larger than the outer diameter of the coil 12 and smaller than the outer diameter of the annular clamping plate 121 on the coil 12 . The end of the coil 12 away from the annular clamping plate 121 penetrates into the sleeve 11 from the end of the sleeve 11 away from the annular baffle 111, and passes through the inner ring of the annular baffle 111 of the sleeve 11 until the end of the coil 12 is closed. The annular clamping plate 121 is blocked by the annular baffle 111 of the sleeve 11 , and the solenoid 12 can rotate freely in the sleeve 11 so as to send the resistance tube 3 to the position of the conductive inner core 21 of the cable 2 .

The procedure for connecting the cable 2 and the resistance tube 3 using the screw-type terminal 1 is as follows. First, peel off a section of the insulating shell at the end of the cable 2 (see Figure 1) to expose the inner wire core, align the conductive inner core 21 with the sleeve 11 of the bolt-type terminal 1 and insert it axially along the sleeve 11 (See Figure 2), and then press the left end of the sleeve 11 with the terminal crimping pliers, so that the sleeve 11 and the conductive inner core 21 are crimped firmly to ensure that the cable 2 and the bolt-type terminal 1 are tightly connected. The bolt-type terminal 1 is crimped with the wire, and there is no need to worry about losing the fixing nut during the process of disassembly and installation, which indirectly ensures the safety of maintenance. Then, align the external thread terminal of the resistance tube 3 with the solenoid 12 on the right side of the bolt-type terminal 1 (see FIG. 1 ). The internal thread of the solenoid 12 is designed to match the external thread of the resistance tube terminal 31 , turn the solenoid 12 with a wrench, so that the resistance tube terminal 31 moves continuously until it withstands the conductive inner core 21 of the cable 2 that has been crimped firmly (see Figure 3), ensuring the tightness of the connection between the three solidity.

The bolt-type terminal 1 and the resistance tube terminal 31 are sleeved along the direction of the center axis of the two, which can avoid the problem of direct contact between the conventional terminal and the adjacent metal tube connecting piece. In addition, it is more convenient to install with a torque wrench, which can not only ensure the bolt tightening torque, but also ensure the current carrying capacity of the large-section wire connection. In addition, bolt-type terminals 1 of different sizes can be made according to cables 2 and resistance tubes 3 of different cross-sectional sizes, which has applicability. In addition, since the bolt-type terminal 1 is crimped with the conductive inner core 21 of the cable 2, there is no need to worry about losing the fixing nut during disassembly and installation, which indirectly ensures the safety of maintenance.

Wherein, the outer side of the section of the coil 12 extending out of the sleeve 11 is a polygonal prismatic structure, specifically a regular hexagonal prismatic structure, which matches the structure of a conventional wrench and is easy to install.

In addition, after the connection of the cable 2, the screw-type terminal 1 and the resistance tube 3 is completed, wrap a layer of PET heat-shrinkable hose or PVC heat-shrinkable sleeve on the screw-type terminal 1 and the position where it connects with the other two. 11. Ensure the insulation of the connection.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the protection scope of the present invention. Persons should understand that the technical solutions of the present invention may be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention.

Claims (7)

1. The connecting terminal is used for connecting a cable and a resistance tube with an external thread terminal, and is characterized by comprising a sleeve fixed on the side of the cable and a solenoid connected with the terminal of the resistance tube, wherein the sleeve is coaxially communicated with the inner diameter of the solenoid, the inner diameter of the sleeve is larger than that of the solenoid, a conductive inner core of the cable is inserted into the sleeve and is in compression joint with the conductive inner core, an internal thread matched with the external thread is formed in the solenoid, and the terminal of the resistance tube is screwed into the solenoid so as to be in contact with the conductive inner core of the cable.

2. The bolt-type connection terminal for a resistance tube for an externally threaded connection terminal as claimed in claim 1, wherein the outside of said screw tube has a polygonal prismatic structure.

3. A bolt-type terminal for a resistance tube for an externally threaded terminal according to claim 2, wherein said polygonal prismatic structure is a regular hexagonal prism.

4. A bolt-type terminal for a resistance tube for an externally threaded terminal according to claim 1, wherein said sleeve is rotatably coupled to said threaded tube.

5. The bolt-type terminal for a resistance tube of an externally threaded terminal according to claim 4, wherein the end surface of the sleeve near the coil extends toward the center of the circle to form an annular baffle, the end surface of the coil near the sleeve extends away from the center of the circle to form an annular snap-in plate, and an inner ring diameter of the annular baffle is larger than an outer diameter of the coil and smaller than an outer ring diameter of the annular snap-in plate on the coil.

6. The bolt-type terminal for a resistance tube of an externally threaded terminal as claimed in claim 1, wherein the bolt-type terminal for a resistance tube of an externally threaded terminal is externally wrapped with a heat shrink tube.

7. A bolt-type terminal for a resistance tube for an externally threaded terminal as claimed in claim 6 wherein said heat shrink tube is a PET heat shrink hose or PVC heat shrink sleeve.

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